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PKGBUILDs/core/linux-orion/aufs3-git-extras.patch
Bill Durr c078116bf4 core/linux-orion to 3.2.1-1
2012-01-25 00:44:29 -05:00

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diff -urN a/Documentation/ABI/testing/debugfs-aufs b/Documentation/ABI/testing/debugfs-aufs
--- a/Documentation/ABI/testing/debugfs-aufs 1969-12-31 17:00:00.000000000 -0700
+++ b/Documentation/ABI/testing/debugfs-aufs 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,37 @@
+What: /debug/aufs/si_<id>/
+Date: March 2009
+Contact: J. R. Okajima <hooanon05@yahoo.co.jp>
+Description:
+ Under /debug/aufs, a directory named si_<id> is created
+ per aufs mount, where <id> is a unique id generated
+ internally.
+
+What: /debug/aufs/si_<id>/xib
+Date: March 2009
+Contact: J. R. Okajima <hooanon05@yahoo.co.jp>
+Description:
+ It shows the consumed blocks by xib (External Inode Number
+ Bitmap), its block size and file size.
+ When the aufs mount option 'noxino' is specified, it
+ will be empty. About XINO files, see the aufs manual.
+
+What: /debug/aufs/si_<id>/xino0, xino1 ... xinoN
+Date: March 2009
+Contact: J. R. Okajima <hooanon05@yahoo.co.jp>
+Description:
+ It shows the consumed blocks by xino (External Inode Number
+ Translation Table), its link count, block size and file
+ size.
+ When the aufs mount option 'noxino' is specified, it
+ will be empty. About XINO files, see the aufs manual.
+
+What: /debug/aufs/si_<id>/xigen
+Date: March 2009
+Contact: J. R. Okajima <hooanon05@yahoo.co.jp>
+Description:
+ It shows the consumed blocks by xigen (External Inode
+ Generation Table), its block size and file size.
+ If CONFIG_AUFS_EXPORT is disabled, this entry will not
+ be created.
+ When the aufs mount option 'noxino' is specified, it
+ will be empty. About XINO files, see the aufs manual.
diff -urN a/Documentation/ABI/testing/sysfs-aufs b/Documentation/ABI/testing/sysfs-aufs
--- a/Documentation/ABI/testing/sysfs-aufs 1969-12-31 17:00:00.000000000 -0700
+++ b/Documentation/ABI/testing/sysfs-aufs 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,24 @@
+What: /sys/fs/aufs/si_<id>/
+Date: March 2009
+Contact: J. R. Okajima <hooanon05@yahoo.co.jp>
+Description:
+ Under /sys/fs/aufs, a directory named si_<id> is created
+ per aufs mount, where <id> is a unique id generated
+ internally.
+
+What: /sys/fs/aufs/si_<id>/br0, br1 ... brN
+Date: March 2009
+Contact: J. R. Okajima <hooanon05@yahoo.co.jp>
+Description:
+ It shows the abolute path of a member directory (which
+ is called branch) in aufs, and its permission.
+
+What: /sys/fs/aufs/si_<id>/xi_path
+Date: March 2009
+Contact: J. R. Okajima <hooanon05@yahoo.co.jp>
+Description:
+ It shows the abolute path of XINO (External Inode Number
+ Bitmap, Translation Table and Generation Table) file
+ even if it is the default path.
+ When the aufs mount option 'noxino' is specified, it
+ will be empty. About XINO files, see the aufs manual.
diff -urN a/Documentation/filesystems/aufs/design/01intro.txt b/Documentation/filesystems/aufs/design/01intro.txt
--- a/Documentation/filesystems/aufs/design/01intro.txt 1969-12-31 17:00:00.000000000 -0700
+++ b/Documentation/filesystems/aufs/design/01intro.txt 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,162 @@
+
+# Copyright (C) 2005-2011 Junjiro R. Okajima
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+Introduction
+----------------------------------------
+
+aufs [ei ju: ef es] | [a u f s]
+1. abbrev. for "advanced multi-layered unification filesystem".
+2. abbrev. for "another unionfs".
+3. abbrev. for "auf das" in German which means "on the" in English.
+ Ex. "Butter aufs Brot"(G) means "butter onto bread"(E).
+ But "Filesystem aufs Filesystem" is hard to understand.
+
+AUFS is a filesystem with features:
+- multi layered stackable unification filesystem, the member directory
+ is called as a branch.
+- branch permission and attribute, 'readonly', 'real-readonly',
+ 'readwrite', 'whiteout-able', 'link-able whiteout' and their
+ combination.
+- internal "file copy-on-write".
+- logical deletion, whiteout.
+- dynamic branch manipulation, adding, deleting and changing permission.
+- allow bypassing aufs, user's direct branch access.
+- external inode number translation table and bitmap which maintains the
+ persistent aufs inode number.
+- seekable directory, including NFS readdir.
+- file mapping, mmap and sharing pages.
+- pseudo-link, hardlink over branches.
+- loopback mounted filesystem as a branch.
+- several policies to select one among multiple writable branches.
+- revert a single systemcall when an error occurs in aufs.
+- and more...
+
+
+Multi Layered Stackable Unification Filesystem
+----------------------------------------------------------------------
+Most people already knows what it is.
+It is a filesystem which unifies several directories and provides a
+merged single directory. When users access a file, the access will be
+passed/re-directed/converted (sorry, I am not sure which English word is
+correct) to the real file on the member filesystem. The member
+filesystem is called 'lower filesystem' or 'branch' and has a mode
+'readonly' and 'readwrite.' And the deletion for a file on the lower
+readonly branch is handled by creating 'whiteout' on the upper writable
+branch.
+
+On LKML, there have been discussions about UnionMount (Jan Blunck,
+Bharata B Rao and Valerie Aurora) and Unionfs (Erez Zadok). They took
+different approaches to implement the merged-view.
+The former tries putting it into VFS, and the latter implements as a
+separate filesystem.
+(If I misunderstand about these implementations, please let me know and
+I shall correct it. Because it is a long time ago when I read their
+source files last time).
+
+UnionMount's approach will be able to small, but may be hard to share
+branches between several UnionMount since the whiteout in it is
+implemented in the inode on branch filesystem and always
+shared. According to Bharata's post, readdir does not seems to be
+finished yet.
+There are several missing features known in this implementations such as
+- for users, the inode number may change silently. eg. copy-up.
+- link(2) may break by copy-up.
+- read(2) may get an obsoleted filedata (fstat(2) too).
+- fcntl(F_SETLK) may be broken by copy-up.
+- unnecessary copy-up may happen, for example mmap(MAP_PRIVATE) after
+ open(O_RDWR).
+
+Unionfs has a longer history. When I started implementing a stacking filesystem
+(Aug 2005), it already existed. It has virtual super_block, inode,
+dentry and file objects and they have an array pointing lower same kind
+objects. After contributing many patches for Unionfs, I re-started my
+project AUFS (Jun 2006).
+
+In AUFS, the structure of filesystem resembles to Unionfs, but I
+implemented my own ideas, approaches and enhancements and it became
+totally different one.
+
+Comparing DM snapshot and fs based implementation
+- the number of bytes to be copied between devices is much smaller.
+- the type of filesystem must be one and only.
+- the fs must be writable, no readonly fs, even for the lower original
+ device. so the compression fs will not be usable. but if we use
+ loopback mount, we may address this issue.
+ for instance,
+ mount /cdrom/squashfs.img /sq
+ losetup /sq/ext2.img
+ losetup /somewhere/cow
+ dmsetup "snapshot /dev/loop0 /dev/loop1 ..."
+- it will be difficult (or needs more operations) to extract the
+ difference between the original device and COW.
+- DM snapshot-merge may help a lot when users try merging. in the
+ fs-layer union, users will use rsync(1).
+
+
+Several characters/aspects of aufs
+----------------------------------------------------------------------
+
+Aufs has several characters or aspects.
+1. a filesystem, callee of VFS helper
+2. sub-VFS, caller of VFS helper for branches
+3. a virtual filesystem which maintains persistent inode number
+4. reader/writer of files on branches such like an application
+
+1. Callee of VFS Helper
+As an ordinary linux filesystem, aufs is a callee of VFS. For instance,
+unlink(2) from an application reaches sys_unlink() kernel function and
+then vfs_unlink() is called. vfs_unlink() is one of VFS helper and it
+calls filesystem specific unlink operation. Actually aufs implements the
+unlink operation but it behaves like a redirector.
+
+2. Caller of VFS Helper for Branches
+aufs_unlink() passes the unlink request to the branch filesystem as if
+it were called from VFS. So the called unlink operation of the branch
+filesystem acts as usual. As a caller of VFS helper, aufs should handle
+every necessary pre/post operation for the branch filesystem.
+- acquire the lock for the parent dir on a branch
+- lookup in a branch
+- revalidate dentry on a branch
+- mnt_want_write() for a branch
+- vfs_unlink() for a branch
+- mnt_drop_write() for a branch
+- release the lock on a branch
+
+3. Persistent Inode Number
+One of the most important issue for a filesystem is to maintain inode
+numbers. This is particularly important to support exporting a
+filesystem via NFS. Aufs is a virtual filesystem which doesn't have a
+backend block device for its own. But some storage is necessary to
+maintain inode number. It may be a large space and may not suit to keep
+in memory. Aufs rents some space from its first writable branch
+filesystem (by default) and creates file(s) on it. These files are
+created by aufs internally and removed soon (currently) keeping opened.
+Note: Because these files are removed, they are totally gone after
+ unmounting aufs. It means the inode numbers are not persistent
+ across unmount or reboot. I have a plan to make them really
+ persistent which will be important for aufs on NFS server.
+
+4. Read/Write Files Internally (copy-on-write)
+Because a branch can be readonly, when you write a file on it, aufs will
+"copy-up" it to the upper writable branch internally. And then write the
+originally requested thing to the file. Generally kernel doesn't
+open/read/write file actively. In aufs, even a single write may cause a
+internal "file copy". This behaviour is very similar to cp(1) command.
+
+Some people may think it is better to pass such work to user space
+helper, instead of doing in kernel space. Actually I am still thinking
+about it. But currently I have implemented it in kernel space.
diff -urN a/Documentation/filesystems/aufs/design/02struct.txt b/Documentation/filesystems/aufs/design/02struct.txt
--- a/Documentation/filesystems/aufs/design/02struct.txt 1969-12-31 17:00:00.000000000 -0700
+++ b/Documentation/filesystems/aufs/design/02struct.txt 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,226 @@
+
+# Copyright (C) 2005-2011 Junjiro R. Okajima
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+Basic Aufs Internal Structure
+
+Superblock/Inode/Dentry/File Objects
+----------------------------------------------------------------------
+As like an ordinary filesystem, aufs has its own
+superblock/inode/dentry/file objects. All these objects have a
+dynamically allocated array and store the same kind of pointers to the
+lower filesystem, branch.
+For example, when you build a union with one readwrite branch and one
+readonly, mounted /au, /rw and /ro respectively.
+- /au = /rw + /ro
+- /ro/fileA exists but /rw/fileA
+
+Aufs lookup operation finds /ro/fileA and gets dentry for that. These
+pointers are stored in a aufs dentry. The array in aufs dentry will be,
+- [0] = NULL
+- [1] = /ro/fileA
+
+This style of an array is essentially same to the aufs
+superblock/inode/dentry/file objects.
+
+Because aufs supports manipulating branches, ie. add/delete/change
+dynamically, these objects has its own generation. When branches are
+changed, the generation in aufs superblock is incremented. And a
+generation in other object are compared when it is accessed.
+When a generation in other objects are obsoleted, aufs refreshes the
+internal array.
+
+
+Superblock
+----------------------------------------------------------------------
+Additionally aufs superblock has some data for policies to select one
+among multiple writable branches, XIB files, pseudo-links and kobject.
+See below in detail.
+About the policies which supports copy-down a directory, see policy.txt
+too.
+
+
+Branch and XINO(External Inode Number Translation Table)
+----------------------------------------------------------------------
+Every branch has its own xino (external inode number translation table)
+file. The xino file is created and unlinked by aufs internally. When two
+members of a union exist on the same filesystem, they share the single
+xino file.
+The struct of a xino file is simple, just a sequence of aufs inode
+numbers which is indexed by the lower inode number.
+In the above sample, assume the inode number of /ro/fileA is i111 and
+aufs assigns the inode number i999 for fileA. Then aufs writes 999 as
+4(8) bytes at 111 * 4(8) bytes offset in the xino file.
+
+When the inode numbers are not contiguous, the xino file will be sparse
+which has a hole in it and doesn't consume as much disk space as it
+might appear. If your branch filesystem consumes disk space for such
+holes, then you should specify 'xino=' option at mounting aufs.
+
+Also a writable branch has three kinds of "whiteout bases". All these
+are existed when the branch is joined to aufs and the names are
+whiteout-ed doubly, so that users will never see their names in aufs
+hierarchy.
+1. a regular file which will be linked to all whiteouts.
+2. a directory to store a pseudo-link.
+3. a directory to store an "orphan-ed" file temporary.
+
+1. Whiteout Base
+ When you remove a file on a readonly branch, aufs handles it as a
+ logical deletion and creates a whiteout on the upper writable branch
+ as a hardlink of this file in order not to consume inode on the
+ writable branch.
+2. Pseudo-link Dir
+ See below, Pseudo-link.
+3. Step-Parent Dir
+ When "fileC" exists on the lower readonly branch only and it is
+ opened and removed with its parent dir, and then user writes
+ something into it, then aufs copies-up fileC to this
+ directory. Because there is no other dir to store fileC. After
+ creating a file under this dir, the file is unlinked.
+
+Because aufs supports manipulating branches, ie. add/delete/change
+dynamically, a branch has its own id. When the branch order changes, aufs
+finds the new index by searching the branch id.
+
+
+Pseudo-link
+----------------------------------------------------------------------
+Assume "fileA" exists on the lower readonly branch only and it is
+hardlinked to "fileB" on the branch. When you write something to fileA,
+aufs copies-up it to the upper writable branch. Additionally aufs
+creates a hardlink under the Pseudo-link Directory of the writable
+branch. The inode of a pseudo-link is kept in aufs super_block as a
+simple list. If fileB is read after unlinking fileA, aufs returns
+filedata from the pseudo-link instead of the lower readonly
+branch. Because the pseudo-link is based upon the inode, to keep the
+inode number by xino (see above) is important.
+
+All the hardlinks under the Pseudo-link Directory of the writable branch
+should be restored in a proper location later. Aufs provides a utility
+to do this. The userspace helpers executed at remounting and unmounting
+aufs by default.
+During this utility is running, it puts aufs into the pseudo-link
+maintenance mode. In this mode, only the process which began the
+maintenance mode (and its child processes) is allowed to operate in
+aufs. Some other processes which are not related to the pseudo-link will
+be allowed to run too, but the rest have to return an error or wait
+until the maintenance mode ends. If a process already acquires an inode
+mutex (in VFS), it has to return an error.
+
+
+XIB(external inode number bitmap)
+----------------------------------------------------------------------
+Addition to the xino file per a branch, aufs has an external inode number
+bitmap in a superblock object. It is also a file such like a xino file.
+It is a simple bitmap to mark whether the aufs inode number is in-use or
+not.
+To reduce the file I/O, aufs prepares a single memory page to cache xib.
+
+Aufs implements a feature to truncate/refresh both of xino and xib to
+reduce the number of consumed disk blocks for these files.
+
+
+Virtual or Vertical Dir, and Readdir in Userspace
+----------------------------------------------------------------------
+In order to support multiple layers (branches), aufs readdir operation
+constructs a virtual dir block on memory. For readdir, aufs calls
+vfs_readdir() internally for each dir on branches, merges their entries
+with eliminating the whiteout-ed ones, and sets it to file (dir)
+object. So the file object has its entry list until it is closed. The
+entry list will be updated when the file position is zero and becomes
+old. This decision is made in aufs automatically.
+
+The dynamically allocated memory block for the name of entries has a
+unit of 512 bytes (by default) and stores the names contiguously (no
+padding). Another block for each entry is handled by kmem_cache too.
+During building dir blocks, aufs creates hash list and judging whether
+the entry is whiteouted by its upper branch or already listed.
+The merged result is cached in the corresponding inode object and
+maintained by a customizable life-time option.
+
+Some people may call it can be a security hole or invite DoS attack
+since the opened and once readdir-ed dir (file object) holds its entry
+list and becomes a pressure for system memory. But I'd say it is similar
+to files under /proc or /sys. The virtual files in them also holds a
+memory page (generally) while they are opened. When an idea to reduce
+memory for them is introduced, it will be applied to aufs too.
+For those who really hate this situation, I've developed readdir(3)
+library which operates this merging in userspace. You just need to set
+LD_PRELOAD environment variable, and aufs will not consume no memory in
+kernel space for readdir(3).
+
+
+Workqueue
+----------------------------------------------------------------------
+Aufs sometimes requires privilege access to a branch. For instance,
+in copy-up/down operation. When a user process is going to make changes
+to a file which exists in the lower readonly branch only, and the mode
+of one of ancestor directories may not be writable by a user
+process. Here aufs copy-up the file with its ancestors and they may
+require privilege to set its owner/group/mode/etc.
+This is a typical case of a application character of aufs (see
+Introduction).
+
+Aufs uses workqueue synchronously for this case. It creates its own
+workqueue. The workqueue is a kernel thread and has privilege. Aufs
+passes the request to call mkdir or write (for example), and wait for
+its completion. This approach solves a problem of a signal handler
+simply.
+If aufs didn't adopt the workqueue and changed the privilege of the
+process, and if the mkdir/write call arises SIGXFSZ or other signal,
+then the user process might gain a privilege or the generated core file
+was owned by a superuser.
+
+Also aufs uses the system global workqueue ("events" kernel thread) too
+for asynchronous tasks, such like handling inotify/fsnotify, re-creating a
+whiteout base and etc. This is unrelated to a privilege.
+Most of aufs operation tries acquiring a rw_semaphore for aufs
+superblock at the beginning, at the same time waits for the completion
+of all queued asynchronous tasks.
+
+
+Whiteout
+----------------------------------------------------------------------
+The whiteout in aufs is very similar to Unionfs's. That is represented
+by its filename. UnionMount takes an approach of a file mode, but I am
+afraid several utilities (find(1) or something) will have to support it.
+
+Basically the whiteout represents "logical deletion" which stops aufs to
+lookup further, but also it represents "dir is opaque" which also stop
+lookup.
+
+In aufs, rmdir(2) and rename(2) for dir uses whiteout alternatively.
+In order to make several functions in a single systemcall to be
+revertible, aufs adopts an approach to rename a directory to a temporary
+unique whiteouted name.
+For example, in rename(2) dir where the target dir already existed, aufs
+renames the target dir to a temporary unique whiteouted name before the
+actual rename on a branch and then handles other actions (make it opaque,
+update the attributes, etc). If an error happens in these actions, aufs
+simply renames the whiteouted name back and returns an error. If all are
+succeeded, aufs registers a function to remove the whiteouted unique
+temporary name completely and asynchronously to the system global
+workqueue.
+
+
+Copy-up
+----------------------------------------------------------------------
+It is a well-known feature or concept.
+When user modifies a file on a readonly branch, aufs operate "copy-up"
+internally and makes change to the new file on the upper writable branch.
+When the trigger systemcall does not update the timestamps of the parent
+dir, aufs reverts it after copy-up.
diff -urN a/Documentation/filesystems/aufs/design/03lookup.txt b/Documentation/filesystems/aufs/design/03lookup.txt
--- a/Documentation/filesystems/aufs/design/03lookup.txt 1969-12-31 17:00:00.000000000 -0700
+++ b/Documentation/filesystems/aufs/design/03lookup.txt 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,106 @@
+
+# Copyright (C) 2005-2011 Junjiro R. Okajima
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+Lookup in a Branch
+----------------------------------------------------------------------
+Since aufs has a character of sub-VFS (see Introduction), it operates
+lookup for branches as VFS does. It may be a heavy work. Generally
+speaking struct nameidata is a bigger structure and includes many
+information. But almost all lookup operation in aufs is the simplest
+case, ie. lookup only an entry directly connected to its parent. Digging
+down the directory hierarchy is unnecessary.
+
+VFS has a function lookup_one_len() for that use, but it is not usable
+for a branch filesystem which requires struct nameidata. So aufs
+implements a simple lookup wrapper function. When a branch filesystem
+allows NULL as nameidata, it calls lookup_one_len(). Otherwise it builds
+a simplest nameidata and calls lookup_hash().
+Here aufs applies "a principle in NFSD", ie. if the filesystem supports
+NFS-export, then it has to support NULL as a nameidata parameter for
+->create(), ->lookup() and ->d_revalidate(). So the lookup wrapper in
+aufs tests if ->s_export_op in the branch is NULL or not.
+
+When a branch is a remote filesystem, aufs basically trusts its
+->d_revalidate(), also aufs forces the hardest revalidate tests for
+them.
+For d_revalidate, aufs implements three levels of revalidate tests. See
+"Revalidate Dentry and UDBA" in detail.
+
+
+Loopback Mount
+----------------------------------------------------------------------
+Basically aufs supports any type of filesystem and block device for a
+branch (actually there are some exceptions). But it is prohibited to add
+a loopback mounted one whose backend file exists in a filesystem which is
+already added to aufs. The reason is to protect aufs from a recursive
+lookup. If it was allowed, the aufs lookup operation might re-enter a
+lookup for the loopback mounted branch in the same context, and will
+cause a deadlock.
+
+
+Revalidate Dentry and UDBA (User's Direct Branch Access)
+----------------------------------------------------------------------
+Generally VFS helpers re-validate a dentry as a part of lookup.
+0. digging down the directory hierarchy.
+1. lock the parent dir by its i_mutex.
+2. lookup the final (child) entry.
+3. revalidate it.
+4. call the actual operation (create, unlink, etc.)
+5. unlock the parent dir
+
+If the filesystem implements its ->d_revalidate() (step 3), then it is
+called. Actually aufs implements it and checks the dentry on a branch is
+still valid.
+But it is not enough. Because aufs has to release the lock for the
+parent dir on a branch at the end of ->lookup() (step 2) and
+->d_revalidate() (step 3) while the i_mutex of the aufs dir is still
+held by VFS.
+If the file on a branch is changed directly, eg. bypassing aufs, after
+aufs released the lock, then the subsequent operation may cause
+something unpleasant result.
+
+This situation is a result of VFS architecture, ->lookup() and
+->d_revalidate() is separated. But I never say it is wrong. It is a good
+design from VFS's point of view. It is just not suitable for sub-VFS
+character in aufs.
+
+Aufs supports such case by three level of revalidation which is
+selectable by user.
+1. Simple Revalidate
+ Addition to the native flow in VFS's, confirm the child-parent
+ relationship on the branch just after locking the parent dir on the
+ branch in the "actual operation" (step 4). When this validation
+ fails, aufs returns EBUSY. ->d_revalidate() (step 3) in aufs still
+ checks the validation of the dentry on branches.
+2. Monitor Changes Internally by Inotify/Fsnotify
+ Addition to above, in the "actual operation" (step 4) aufs re-lookup
+ the dentry on the branch, and returns EBUSY if it finds different
+ dentry.
+ Additionally, aufs sets the inotify/fsnotify watch for every dir on branches
+ during it is in cache. When the event is notified, aufs registers a
+ function to kernel 'events' thread by schedule_work(). And the
+ function sets some special status to the cached aufs dentry and inode
+ private data. If they are not cached, then aufs has nothing to
+ do. When the same file is accessed through aufs (step 0-3) later,
+ aufs will detect the status and refresh all necessary data.
+ In this mode, aufs has to ignore the event which is fired by aufs
+ itself.
+3. No Extra Validation
+ This is the simplest test and doesn't add any additional revalidation
+ test, and skip therevalidatin in step 4. It is useful and improves
+ aufs performance when system surely hide the aufs branches from user,
+ by over-mounting something (or another method).
diff -urN a/Documentation/filesystems/aufs/design/04branch.txt b/Documentation/filesystems/aufs/design/04branch.txt
--- a/Documentation/filesystems/aufs/design/04branch.txt 1969-12-31 17:00:00.000000000 -0700
+++ b/Documentation/filesystems/aufs/design/04branch.txt 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,76 @@
+
+# Copyright (C) 2005-2011 Junjiro R. Okajima
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+Branch Manipulation
+
+Since aufs supports dynamic branch manipulation, ie. add/remove a branch
+and changing its permission/attribute, there are a lot of works to do.
+
+
+Add a Branch
+----------------------------------------------------------------------
+o Confirm the adding dir exists outside of aufs, including loopback
+ mount.
+- and other various attributes...
+o Initialize the xino file and whiteout bases if necessary.
+ See struct.txt.
+
+o Check the owner/group/mode of the directory
+ When the owner/group/mode of the adding directory differs from the
+ existing branch, aufs issues a warning because it may impose a
+ security risk.
+ For example, when a upper writable branch has a world writable empty
+ top directory, a malicious user can create any files on the writable
+ branch directly, like copy-up and modify manually. If something like
+ /etc/{passwd,shadow} exists on the lower readonly branch but the upper
+ writable branch, and the writable branch is world-writable, then a
+ malicious guy may create /etc/passwd on the writable branch directly
+ and the infected file will be valid in aufs.
+ I am afraid it can be a security issue, but nothing to do except
+ producing a warning.
+
+
+Delete a Branch
+----------------------------------------------------------------------
+o Confirm the deleting branch is not busy
+ To be general, there is one merit to adopt "remount" interface to
+ manipulate branches. It is to discard caches. At deleting a branch,
+ aufs checks the still cached (and connected) dentries and inodes. If
+ there are any, then they are all in-use. An inode without its
+ corresponding dentry can be alive alone (for example, inotify/fsnotify case).
+
+ For the cached one, aufs checks whether the same named entry exists on
+ other branches.
+ If the cached one is a directory, because aufs provides a merged view
+ to users, as long as one dir is left on any branch aufs can show the
+ dir to users. In this case, the branch can be removed from aufs.
+ Otherwise aufs rejects deleting the branch.
+
+ If any file on the deleting branch is opened by aufs, then aufs
+ rejects deleting.
+
+
+Modify the Permission of a Branch
+----------------------------------------------------------------------
+o Re-initialize or remove the xino file and whiteout bases if necessary.
+ See struct.txt.
+
+o rw --> ro: Confirm the modifying branch is not busy
+ Aufs rejects the request if any of these conditions are true.
+ - a file on the branch is mmap-ed.
+ - a regular file on the branch is opened for write and there is no
+ same named entry on the upper branch.
diff -urN a/Documentation/filesystems/aufs/design/05wbr_policy.txt b/Documentation/filesystems/aufs/design/05wbr_policy.txt
--- a/Documentation/filesystems/aufs/design/05wbr_policy.txt 1969-12-31 17:00:00.000000000 -0700
+++ b/Documentation/filesystems/aufs/design/05wbr_policy.txt 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,65 @@
+
+# Copyright (C) 2005-2011 Junjiro R. Okajima
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+Policies to Select One among Multiple Writable Branches
+----------------------------------------------------------------------
+When the number of writable branch is more than one, aufs has to decide
+the target branch for file creation or copy-up. By default, the highest
+writable branch which has the parent (or ancestor) dir of the target
+file is chosen (top-down-parent policy).
+By user's request, aufs implements some other policies to select the
+writable branch, for file creation two policies, round-robin and
+most-free-space policies. For copy-up three policies, top-down-parent,
+bottom-up-parent and bottom-up policies.
+
+As expected, the round-robin policy selects the branch in circular. When
+you have two writable branches and creates 10 new files, 5 files will be
+created for each branch. mkdir(2) systemcall is an exception. When you
+create 10 new directories, all will be created on the same branch.
+And the most-free-space policy selects the one which has most free
+space among the writable branches. The amount of free space will be
+checked by aufs internally, and users can specify its time interval.
+
+The policies for copy-up is more simple,
+top-down-parent is equivalent to the same named on in create policy,
+bottom-up-parent selects the writable branch where the parent dir
+exists and the nearest upper one from the copyup-source,
+bottom-up selects the nearest upper writable branch from the
+copyup-source, regardless the existence of the parent dir.
+
+There are some rules or exceptions to apply these policies.
+- If there is a readonly branch above the policy-selected branch and
+ the parent dir is marked as opaque (a variation of whiteout), or the
+ target (creating) file is whiteout-ed on the upper readonly branch,
+ then the result of the policy is ignored and the target file will be
+ created on the nearest upper writable branch than the readonly branch.
+- If there is a writable branch above the policy-selected branch and
+ the parent dir is marked as opaque or the target file is whiteouted
+ on the branch, then the result of the policy is ignored and the target
+ file will be created on the highest one among the upper writable
+ branches who has diropq or whiteout. In case of whiteout, aufs removes
+ it as usual.
+- link(2) and rename(2) systemcalls are exceptions in every policy.
+ They try selecting the branch where the source exists as possible
+ since copyup a large file will take long time. If it can't be,
+ ie. the branch where the source exists is readonly, then they will
+ follow the copyup policy.
+- There is an exception for rename(2) when the target exists.
+ If the rename target exists, aufs compares the index of the branches
+ where the source and the target exists and selects the higher
+ one. If the selected branch is readonly, then aufs follows the
+ copyup policy.
diff -urN a/Documentation/filesystems/aufs/design/06mmap.txt b/Documentation/filesystems/aufs/design/06mmap.txt
--- a/Documentation/filesystems/aufs/design/06mmap.txt 1969-12-31 17:00:00.000000000 -0700
+++ b/Documentation/filesystems/aufs/design/06mmap.txt 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,47 @@
+
+# Copyright (C) 2005-2011 Junjiro R. Okajima
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+mmap(2) -- File Memory Mapping
+----------------------------------------------------------------------
+In aufs, the file-mapped pages are handled by a branch fs directly, no
+interaction with aufs. It means aufs_mmap() calls the branch fs's
+->mmap().
+This approach is simple and good, but there is one problem.
+Under /proc, several entries show the mmap-ped files by its path (with
+device and inode number), and the printed path will be the path on the
+branch fs's instead of virtual aufs's.
+This is not a problem in most cases, but some utilities lsof(1) (and its
+user) may expect the path on aufs.
+
+To address this issue, aufs adds a new member called vm_prfile in struct
+vm_area_struct (and struct vm_region). The original vm_file points to
+the file on the branch fs in order to handle everything correctly as
+usual. The new vm_prfile points to a virtual file in aufs, and the
+show-functions in procfs refers to vm_prfile if it is set.
+Also we need to maintain several other places where touching vm_file
+such like
+- fork()/clone() copies vma and the reference count of vm_file is
+ incremented.
+- merging vma maintains the ref count too.
+
+This is not a good approach. It just faking the printed path. But it
+leaves all behaviour around f_mapping unchanged. This is surely an
+advantage.
+Actually aufs had adopted another complicated approach which calls
+generic_file_mmap() and handles struct vm_operations_struct. In this
+approach, aufs met a hard problem and I could not solve it without
+switching the approach.
diff -urN a/Documentation/filesystems/aufs/design/07export.txt b/Documentation/filesystems/aufs/design/07export.txt
--- a/Documentation/filesystems/aufs/design/07export.txt 1969-12-31 17:00:00.000000000 -0700
+++ b/Documentation/filesystems/aufs/design/07export.txt 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,59 @@
+
+# Copyright (C) 2005-2011 Junjiro R. Okajima
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+Export Aufs via NFS
+----------------------------------------------------------------------
+Here is an approach.
+- like xino/xib, add a new file 'xigen' which stores aufs inode
+ generation.
+- iget_locked(): initialize aufs inode generation for a new inode, and
+ store it in xigen file.
+- destroy_inode(): increment aufs inode generation and store it in xigen
+ file. it is necessary even if it is not unlinked, because any data of
+ inode may be changed by UDBA.
+- encode_fh(): for a root dir, simply return FILEID_ROOT. otherwise
+ build file handle by
+ + branch id (4 bytes)
+ + superblock generation (4 bytes)
+ + inode number (4 or 8 bytes)
+ + parent dir inode number (4 or 8 bytes)
+ + inode generation (4 bytes))
+ + return value of exportfs_encode_fh() for the parent on a branch (4
+ bytes)
+ + file handle for a branch (by exportfs_encode_fh())
+- fh_to_dentry():
+ + find the index of a branch from its id in handle, and check it is
+ still exist in aufs.
+ + 1st level: get the inode number from handle and search it in cache.
+ + 2nd level: if not found, get the parent inode number from handle and
+ search it in cache. and then open the parent dir, find the matching
+ inode number by vfs_readdir() and get its name, and call
+ lookup_one_len() for the target dentry.
+ + 3rd level: if the parent dir is not cached, call
+ exportfs_decode_fh() for a branch and get the parent on a branch,
+ build a pathname of it, convert it a pathname in aufs, call
+ path_lookup(). now aufs gets a parent dir dentry, then handle it as
+ the 2nd level.
+ + to open the dir, aufs needs struct vfsmount. aufs keeps vfsmount
+ for every branch, but not itself. to get this, (currently) aufs
+ searches in current->nsproxy->mnt_ns list. it may not be a good
+ idea, but I didn't get other approach.
+ + test the generation of the gotten inode.
+- every inode operation: they may get EBUSY due to UDBA. in this case,
+ convert it into ESTALE for NFSD.
+- readdir(): call lockdep_on/off() because filldir in NFSD calls
+ lookup_one_len(), vfs_getattr(), encode_fh() and others.
diff -urN a/Documentation/filesystems/aufs/design/08shwh.txt b/Documentation/filesystems/aufs/design/08shwh.txt
--- a/Documentation/filesystems/aufs/design/08shwh.txt 1969-12-31 17:00:00.000000000 -0700
+++ b/Documentation/filesystems/aufs/design/08shwh.txt 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,53 @@
+
+# Copyright (C) 2005-2011 Junjiro R. Okajima
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+Show Whiteout Mode (shwh)
+----------------------------------------------------------------------
+Generally aufs hides the name of whiteouts. But in some cases, to show
+them is very useful for users. For instance, creating a new middle layer
+(branch) by merging existing layers.
+
+(borrowing aufs1 HOW-TO from a user, Michael Towers)
+When you have three branches,
+- Bottom: 'system', squashfs (underlying base system), read-only
+- Middle: 'mods', squashfs, read-only
+- Top: 'overlay', ram (tmpfs), read-write
+
+The top layer is loaded at boot time and saved at shutdown, to preserve
+the changes made to the system during the session.
+When larger changes have been made, or smaller changes have accumulated,
+the size of the saved top layer data grows. At this point, it would be
+nice to be able to merge the two overlay branches ('mods' and 'overlay')
+and rewrite the 'mods' squashfs, clearing the top layer and thus
+restoring save and load speed.
+
+This merging is simplified by the use of another aufs mount, of just the
+two overlay branches using the 'shwh' option.
+# mount -t aufs -o ro,shwh,br:/livesys/overlay=ro+wh:/livesys/mods=rr+wh \
+ aufs /livesys/merge_union
+
+A merged view of these two branches is then available at
+/livesys/merge_union, and the new feature is that the whiteouts are
+visible!
+Note that in 'shwh' mode the aufs mount must be 'ro', which will disable
+writing to all branches. Also the default mode for all branches is 'ro'.
+It is now possible to save the combined contents of the two overlay
+branches to a new squashfs, e.g.:
+# mksquashfs /livesys/merge_union /path/to/newmods.squash
+
+This new squashfs archive can be stored on the boot device and the
+initramfs will use it to replace the old one at the next boot.
diff -urN a/Documentation/filesystems/aufs/design/10dynop.txt b/Documentation/filesystems/aufs/design/10dynop.txt
--- a/Documentation/filesystems/aufs/design/10dynop.txt 1969-12-31 17:00:00.000000000 -0700
+++ b/Documentation/filesystems/aufs/design/10dynop.txt 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,47 @@
+
+# Copyright (C) 2010-2011 Junjiro R. Okajima
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+Dynamically customizable FS operations
+----------------------------------------------------------------------
+Generally FS operations (struct inode_operations, struct
+address_space_operations, struct file_operations, etc.) are defined as
+"static const", but it never means that FS have only one set of
+operation. Some FS have multiple sets of them. For instance, ext2 has
+three sets, one for XIP, for NOBH, and for normal.
+Since aufs overrides and redirects these operations, sometimes aufs has
+to change its behaviour according to the branch FS type. More imporantly
+VFS acts differently if a function (member in the struct) is set or
+not. It means aufs should have several sets of operations and select one
+among them according to the branch FS definition.
+
+In order to solve this problem and not to affect the behavour of VFS,
+aufs defines these operations dynamically. For instance, aufs defines
+aio_read function for struct file_operations, but it may not be set to
+the file_operations. When the branch FS doesn't have it, aufs doesn't
+set it to its file_operations while the function definition itself is
+still alive. So the behaviour of io_submit(2) will not change, and it
+will return an error when aio_read is not defined.
+
+The lifetime of these dynamically generated operation object is
+maintained by aufs branch object. When the branch is removed from aufs,
+the reference counter of the object is decremented. When it reaches
+zero, the dynamically generated operation object will be freed.
+
+This approach is designed to support AIO (io_submit), Direcit I/O and
+XIP mainly.
+Currently this approach is applied to file_operations and
+vm_operations_struct for regular files only.
diff -urN a/Documentation/filesystems/aufs/design/99plan.txt b/Documentation/filesystems/aufs/design/99plan.txt
--- a/Documentation/filesystems/aufs/design/99plan.txt 1969-12-31 17:00:00.000000000 -0700
+++ b/Documentation/filesystems/aufs/design/99plan.txt 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,96 @@
+
+# Copyright (C) 2005-2011 Junjiro R. Okajima
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+Plan
+
+Restoring some features which was implemented in aufs1.
+They were dropped in aufs2 in order to make source files simpler and
+easier to be reviewed.
+
+
+Test Only the Highest One for the Directory Permission (dirperm1 option)
+----------------------------------------------------------------------
+Let's try case study.
+- aufs has two branches, upper readwrite and lower readonly.
+ /au = /rw + /ro
+- "dirA" exists under /ro, but /rw. and its mode is 0700.
+- user invoked "chmod a+rx /au/dirA"
+- then "dirA" becomes world readable?
+
+In this case, /ro/dirA is still 0700 since it exists in readonly branch,
+or it may be a natively readonly filesystem. If aufs respects the lower
+branch, it should not respond readdir request from other users. But user
+allowed it by chmod. Should really aufs rejects showing the entries
+under /ro/dirA?
+
+To be honest, I don't have a best solution for this case. So I
+implemented 'dirperm1' and 'nodirperm1' option in aufs1, and leave it to
+users.
+When dirperm1 is specified, aufs checks only the highest one for the
+directory permission, and shows the entries. Otherwise, as usual, checks
+every dir existing on all branches and rejects the request.
+
+As a side effect, dirperm1 option improves the performance of aufs
+because the number of permission check is reduced.
+
+
+Being Another Aufs's Readonly Branch (robr)
+----------------------------------------------------------------------
+Aufs1 allows aufs to be another aufs's readonly branch.
+This feature was developed by a user's request. But it may not be used
+currecnly.
+
+
+Copy-up on Open (coo=)
+----------------------------------------------------------------------
+By default the internal copy-up is executed when it is really necessary.
+It is not done when a file is opened for writing, but when write(2) is
+done. Users who have many (over 100) branches want to know and analyse
+when and what file is copied-up. To insert a new upper branch which
+contains such files only may improve the performance of aufs.
+
+Aufs1 implemented "coo=none | leaf | all" option.
+
+
+Refresh the Opened File (refrof)
+----------------------------------------------------------------------
+This option is implemented in aufs1 but incomplete.
+
+When user reads from a file, he expects to get its latest filedata
+generally. If the file is removed and a new same named file is created,
+the content he gets is unchanged, ie. the unlinked filedata.
+
+Let's try case study again.
+- aufs has two branches.
+ /au = /rw + /ro
+- "fileA" exists under /ro, but /rw.
+- user opened "/au/fileA".
+- he or someone else inserts a branch (/new) between /rw and /ro.
+ /au = /rw + /new + /ro
+- the new branch has "fileA".
+- user reads from the opened "fileA"
+- which filedata should aufs return, from /ro or /new?
+
+Some people says it has to be "from /ro" and it is a semantics of Unix.
+The others say it should be "from /new" because the file is not removed
+and it is equivalent to the case of someone else modifies the file.
+
+Here again I don't have a best and final answer. I got an idea to
+implement 'refrof' and 'norefrof' option. When 'refrof' (REFResh the
+Opened File) is specified (by default), aufs returns the filedata from
+/new.
+Otherwise from /new.
diff -urN a/Documentation/filesystems/aufs/README b/Documentation/filesystems/aufs/README
--- a/Documentation/filesystems/aufs/README 1969-12-31 17:00:00.000000000 -0700
+++ b/Documentation/filesystems/aufs/README 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,328 @@
+
+Aufs3 -- advanced multi layered unification filesystem version 3.x
+http://aufs.sf.net
+Junjiro R. Okajima
+
+
+0. Introduction
+----------------------------------------
+In the early days, aufs was entirely re-designed and re-implemented
+Unionfs Version 1.x series. After many original ideas, approaches,
+improvements and implementations, it becomes totally different from
+Unionfs while keeping the basic features.
+Recently, Unionfs Version 2.x series begin taking some of the same
+approaches to aufs1's.
+Unionfs is being developed by Professor Erez Zadok at Stony Brook
+University and his team.
+
+Aufs3 supports linux-3.0 and later.
+If you want older kernel version support, try aufs2-2.6.git or
+aufs2-standalone.git repository, aufs1 from CVS on SourceForge.
+
+Note: it becomes clear that "Aufs was rejected. Let's give it up."
+According to Christoph Hellwig, linux rejects all union-type filesystems
+but UnionMount.
+<http://marc.info/?l=linux-kernel&m=123938533724484&w=2>
+
+
+1. Features
+----------------------------------------
+- unite several directories into a single virtual filesystem. The member
+ directory is called as a branch.
+- you can specify the permission flags to the branch, which are 'readonly',
+ 'readwrite' and 'whiteout-able.'
+- by upper writable branch, internal copyup and whiteout, files/dirs on
+ readonly branch are modifiable logically.
+- dynamic branch manipulation, add, del.
+- etc...
+
+Also there are many enhancements in aufs1, such as:
+- readdir(3) in userspace.
+- keep inode number by external inode number table
+- keep the timestamps of file/dir in internal copyup operation
+- seekable directory, supporting NFS readdir.
+- whiteout is hardlinked in order to reduce the consumption of inodes
+ on branch
+- do not copyup, nor create a whiteout when it is unnecessary
+- revert a single systemcall when an error occurs in aufs
+- remount interface instead of ioctl
+- maintain /etc/mtab by an external command, /sbin/mount.aufs.
+- loopback mounted filesystem as a branch
+- kernel thread for removing the dir who has a plenty of whiteouts
+- support copyup sparse file (a file which has a 'hole' in it)
+- default permission flags for branches
+- selectable permission flags for ro branch, whether whiteout can
+ exist or not
+- export via NFS.
+- support <sysfs>/fs/aufs and <debugfs>/aufs.
+- support multiple writable branches, some policies to select one
+ among multiple writable branches.
+- a new semantics for link(2) and rename(2) to support multiple
+ writable branches.
+- no glibc changes are required.
+- pseudo hardlink (hardlink over branches)
+- allow a direct access manually to a file on branch, e.g. bypassing aufs.
+ including NFS or remote filesystem branch.
+- userspace wrapper for pathconf(3)/fpathconf(3) with _PC_LINK_MAX.
+- and more...
+
+Currently these features are dropped temporary from aufs3.
+See design/08plan.txt in detail.
+- test only the highest one for the directory permission (dirperm1)
+- copyup on open (coo=)
+- nested mount, i.e. aufs as readonly no-whiteout branch of another aufs
+ (robr)
+- statistics of aufs thread (/sys/fs/aufs/stat)
+- delegation mode (dlgt)
+ a delegation of the internal branch access to support task I/O
+ accounting, which also supports Linux Security Modules (LSM) mainly
+ for Suse AppArmor.
+- intent.open/create (file open in a single lookup)
+
+Features or just an idea in the future (see also design/*.txt),
+- reorder the branch index without del/re-add.
+- permanent xino files for NFSD
+- an option for refreshing the opened files after add/del branches
+- 'move' policy for copy-up between two writable branches, after
+ checking free space.
+- light version, without branch manipulation. (unnecessary?)
+- copyup in userspace
+- inotify in userspace
+- readv/writev
+- xattr, acl
+
+
+2. Download
+----------------------------------------
+There were three GIT trees for aufs3, aufs3-linux.git,
+aufs3-standalone.git, and aufs-util.git. Note that there is no "3" in
+"aufs-util.git."
+While the aufs-util is always necessary, you need either of aufs3-linux
+or aufs3-standalone.
+
+The aufs3-linux tree includes the whole linux mainline GIT tree,
+git://git.kernel.org/.../torvalds/linux.git.
+And you cannot select CONFIG_AUFS_FS=m for this version, eg. you cannot
+build aufs3 as an externel kernel module.
+
+On the other hand, the aufs3-standalone tree has only aufs source files
+and necessary patches, and you can select CONFIG_AUFS_FS=m.
+
+You will find GIT branches whose name is in form of "aufs3.x" where "x"
+represents the linux kernel version, "linux-3.x". For instance,
+"aufs3.0" is for linux-3.0. For latest "linux-3.x-rcN", use
+"aufs3.x-rcN" branch.
+
+o aufs3-linux tree
+$ git clone --reference /your/linux/git/tree \
+ git://aufs.git.sourceforge.net/gitroot/aufs/aufs3-linux.git \
+ aufs3-linux.git
+- if you don't have linux GIT tree, then remove "--reference ..."
+$ cd aufs3-linux.git
+$ git checkout origin/aufs3.0
+
+o aufs3-standalone tree
+$ git clone git://aufs.git.sourceforge.net/gitroot/aufs/aufs3-standalone.git \
+ aufs3-standalone.git
+$ cd aufs3-standalone.git
+$ git checkout origin/aufs3.0
+
+o aufs-util tree
+$ git clone git://aufs.git.sourceforge.net/gitroot/aufs/aufs-util.git \
+ aufs-util.git
+$ cd aufs-util.git
+$ git checkout origin/aufs3.0
+
+Note: The 3.x-rcN branch is to be used with `rc' kernel versions ONLY.
+The minor version number, 'x' in '3.x', of aufs may not always
+follow the minor version number of the kernel.
+Because changes in the kernel that cause the use of a new
+minor version number do not always require changes to aufs-util.
+
+Since aufs-util has its own minor version number, you may not be
+able to find a GIT branch in aufs-util for your kernel's
+exact minor version number.
+In this case, you should git-checkout the branch for the
+nearest lower number.
+
+For (an unreleased) example:
+If you are using "linux-3.10" and the "aufs3.10" branch
+does not exit in aufs-util repository, then "aufs3.9", "aufs3.8"
+or something numerically smaller is the branch for your kernel.
+
+Also you can view all branches by
+ $ git branch -a
+
+
+3. Configuration and Compilation
+----------------------------------------
+Make sure you have git-checkout'ed the correct branch.
+
+For aufs3-linux tree,
+- enable CONFIG_EXPERIMENTAL and CONFIG_AUFS_FS.
+- set other aufs configurations if necessary.
+
+For aufs3-standalone tree,
+There are several ways to build.
+
+1.
+- apply ./aufs3-kbuild.patch to your kernel source files.
+- apply ./aufs3-base.patch too.
+- apply ./aufs3-proc_map.patch too, if you want to make /proc/PID/maps (and
+ others including lsof(1)) show the file path on aufs instead of the
+ path on the branch fs.
+- apply ./aufs3-standalone.patch too, if you have a plan to set
+ CONFIG_AUFS_FS=m. otherwise you don't need ./aufs3-standalone.patch.
+- copy ./{Documentation,fs,include/linux/aufs_type.h} files to your
+ kernel source tree. Never copy ./include/linux/Kbuild.
+- enable CONFIG_EXPERIMENTAL and CONFIG_AUFS_FS, you can select either
+ =m or =y.
+- and build your kernel as usual.
+- install the built kernel.
+- install the header files too by "make headers_install".
+- and reboot your system.
+
+2.
+- module only (CONFIG_AUFS_FS=m).
+- apply ./aufs3-base.patch to your kernel source files.
+- apply ./aufs3-proc_map.patch too to your kernel source files,
+ if you want to make /proc/PID/maps (and others including lsof(1)) show
+ the file path on aufs instead of the path on the branch fs.
+- apply ./aufs3-standalone.patch too.
+- build your kernel, don't forget "make headers_install", and reboot.
+- edit ./config.mk and set other aufs configurations if necessary.
+ Note: You should read ./fs/aufs/Kconfig carefully which describes
+ every aufs configurations.
+- build the module by simple "make".
+- you can specify ${KDIR} make variable which points to your kernel
+ source tree.
+- install the files
+ + run "make install" to install the aufs module, or copy the built
+ ./aufs.ko to /lib/modules/... and run depmod -a (or reboot simply).
+ + run "make headers_install" to install the aufs header file (you can
+ specify DESTDIR), or copty ./usr/include/linux/aufs_type.h to
+ /usr/include/linux or wherever you like.
+- no need to apply aufs3-kbuild.patch, nor copying source files to your
+ kernel source tree.
+
+Note: The haeder file aufs_type.h is necessary to build aufs-util
+ as well as "make headers_install" in the kernel source tree.
+ headers_install is subject to be forgotten, but it is essentially
+ necessary, not only for building aufs-util.
+ You may not meet problems without headers_install in some older
+ version though.
+
+And then,
+- read README in aufs-util, build and install it
+- note that your distribution may contain an obsoleted version of
+ aufs_type.h in /usr/include/linux or something. When you build aufs
+ utilities, make sure that your compiler refers the correct aufs header
+ file which is built by "make headers_install."
+- if you want to use readdir(3) in userspace or pathconf(3) wrapper,
+ then run "make install_ulib" too. And refer to the aufs manual in
+ detail.
+
+
+4. Usage
+----------------------------------------
+At first, make sure aufs-util are installed, and please read the aufs
+manual, aufs.5 in aufs-util.git tree.
+$ man -l aufs.5
+
+And then,
+$ mkdir /tmp/rw /tmp/aufs
+# mount -t aufs -o br=/tmp/rw:${HOME} none /tmp/aufs
+
+Here is another example. The result is equivalent.
+# mount -t aufs -o br=/tmp/rw=rw:${HOME}=ro none /tmp/aufs
+ Or
+# mount -t aufs -o br:/tmp/rw none /tmp/aufs
+# mount -o remount,append:${HOME} /tmp/aufs
+
+Then, you can see whole tree of your home dir through /tmp/aufs. If
+you modify a file under /tmp/aufs, the one on your home directory is
+not affected, instead the same named file will be newly created under
+/tmp/rw. And all of your modification to a file will be applied to
+the one under /tmp/rw. This is called the file based Copy on Write
+(COW) method.
+Aufs mount options are described in aufs.5.
+If you run chroot or something and make your aufs as a root directory,
+then you need to customize the shutdown script. See the aufs manual in
+detail.
+
+Additionally, there are some sample usages of aufs which are a
+diskless system with network booting, and LiveCD over NFS.
+See sample dir in CVS tree on SourceForge.
+
+
+5. Contact
+----------------------------------------
+When you have any problems or strange behaviour in aufs, please let me
+know with:
+- /proc/mounts (instead of the output of mount(8))
+- /sys/module/aufs/*
+- /sys/fs/aufs/* (if you have them)
+- /debug/aufs/* (if you have them)
+- linux kernel version
+ if your kernel is not plain, for example modified by distributor,
+ the url where i can download its source is necessary too.
+- aufs version which was printed at loading the module or booting the
+ system, instead of the date you downloaded.
+- configuration (define/undefine CONFIG_AUFS_xxx)
+- kernel configuration or /proc/config.gz (if you have it)
+- behaviour which you think to be incorrect
+- actual operation, reproducible one is better
+- mailto: aufs-users at lists.sourceforge.net
+
+Usually, I don't watch the Public Areas(Bugs, Support Requests, Patches,
+and Feature Requests) on SourceForge. Please join and write to
+aufs-users ML.
+
+
+6. Acknowledgements
+----------------------------------------
+Thanks to everyone who have tried and are using aufs, whoever
+have reported a bug or any feedback.
+
+Especially donators:
+Tomas Matejicek(slax.org) made a donation (much more than once).
+ Since Apr 2010, Tomas M (the author of Slax and Linux Live
+ scripts) is making "doubling" donations.
+ Unfortunately I cannot list all of the donators, but I really
+ appriciate.
+ It ends Aug 2010, but the ordinary donation URL is still available.
+ <http://sourceforge.net/donate/index.php?group_id=167503>
+Dai Itasaka made a donation (2007/8).
+Chuck Smith made a donation (2008/4, 10 and 12).
+Henk Schoneveld made a donation (2008/9).
+Chih-Wei Huang, ASUS, CTC donated Eee PC 4G (2008/10).
+Francois Dupoux made a donation (2008/11).
+Bruno Cesar Ribas and Luis Carlos Erpen de Bona, C3SL serves public
+ aufs2 GIT tree (2009/2).
+William Grant made a donation (2009/3).
+Patrick Lane made a donation (2009/4).
+The Mail Archive (mail-archive.com) made donations (2009/5).
+Nippy Networks (Ed Wildgoose) made a donation (2009/7).
+New Dream Network, LLC (www.dreamhost.com) made a donation (2009/11).
+Pavel Pronskiy made a donation (2011/2).
+Iridium and Inmarsat satellite phone retailer (www.mailasail.com), Nippy
+ Networks (Ed Wildgoose) made a donation for hardware (2011/3).
+Max Lekomcev (DOM-TV project) made a donation (2011/7 and 12).
+Sam Liddicott made a donation (2011/9).
+
+Thank you very much.
+Donations are always, including future donations, very important and
+helpful for me to keep on developing aufs.
+
+
+7.
+----------------------------------------
+If you are an experienced user, no explanation is needed. Aufs is
+just a linux filesystem.
+
+
+Enjoy!
+
+# Local variables: ;
+# mode: text;
+# End: ;
diff -urN a/fs/aufs/aufs.h b/fs/aufs/aufs.h
--- a/fs/aufs/aufs.h 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/aufs.h 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * all header files
+ */
+
+#ifndef __AUFS_H__
+#define __AUFS_H__
+
+#ifdef __KERNEL__
+
+#define AuStub(type, name, body, ...) \
+ static inline type name(__VA_ARGS__) { body; }
+
+#define AuStubVoid(name, ...) \
+ AuStub(void, name, , __VA_ARGS__)
+#define AuStubInt0(name, ...) \
+ AuStub(int, name, return 0, __VA_ARGS__)
+
+#include "debug.h"
+
+#include "branch.h"
+#include "cpup.h"
+#include "dcsub.h"
+#include "dbgaufs.h"
+#include "dentry.h"
+#include "dir.h"
+#include "dynop.h"
+#include "file.h"
+#include "fstype.h"
+#include "inode.h"
+#include "loop.h"
+#include "module.h"
+#include "opts.h"
+#include "rwsem.h"
+#include "spl.h"
+#include "super.h"
+#include "sysaufs.h"
+#include "vfsub.h"
+#include "whout.h"
+#include "wkq.h"
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_H__ */
diff -urN a/fs/aufs/branch.c b/fs/aufs/branch.c
--- a/fs/aufs/branch.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/branch.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,1169 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * branch management
+ */
+
+#include <linux/compat.h>
+#include <linux/statfs.h>
+#include "aufs.h"
+
+/*
+ * free a single branch
+ */
+static void au_br_do_free(struct au_branch *br)
+{
+ int i;
+ struct au_wbr *wbr;
+ struct au_dykey **key;
+
+ au_hnotify_fin_br(br);
+
+ if (br->br_xino.xi_file)
+ fput(br->br_xino.xi_file);
+ mutex_destroy(&br->br_xino.xi_nondir_mtx);
+
+ AuDebugOn(atomic_read(&br->br_count));
+
+ wbr = br->br_wbr;
+ if (wbr) {
+ for (i = 0; i < AuBrWh_Last; i++)
+ dput(wbr->wbr_wh[i]);
+ AuDebugOn(atomic_read(&wbr->wbr_wh_running));
+ AuRwDestroy(&wbr->wbr_wh_rwsem);
+ }
+
+ key = br->br_dykey;
+ for (i = 0; i < AuBrDynOp; i++, key++)
+ if (*key)
+ au_dy_put(*key);
+ else
+ break;
+
+ mntput(br->br_mnt);
+ kfree(wbr);
+ kfree(br);
+}
+
+/*
+ * frees all branches
+ */
+void au_br_free(struct au_sbinfo *sbinfo)
+{
+ aufs_bindex_t bmax;
+ struct au_branch **br;
+
+ AuRwMustWriteLock(&sbinfo->si_rwsem);
+
+ bmax = sbinfo->si_bend + 1;
+ br = sbinfo->si_branch;
+ while (bmax--)
+ au_br_do_free(*br++);
+}
+
+/*
+ * find the index of a branch which is specified by @br_id.
+ */
+int au_br_index(struct super_block *sb, aufs_bindex_t br_id)
+{
+ aufs_bindex_t bindex, bend;
+
+ bend = au_sbend(sb);
+ for (bindex = 0; bindex <= bend; bindex++)
+ if (au_sbr_id(sb, bindex) == br_id)
+ return bindex;
+ return -1;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * add a branch
+ */
+
+static int test_overlap(struct super_block *sb, struct dentry *h_adding,
+ struct dentry *h_root)
+{
+ if (unlikely(h_adding == h_root
+ || au_test_loopback_overlap(sb, h_adding)))
+ return 1;
+ if (h_adding->d_sb != h_root->d_sb)
+ return 0;
+ return au_test_subdir(h_adding, h_root)
+ || au_test_subdir(h_root, h_adding);
+}
+
+/*
+ * returns a newly allocated branch. @new_nbranch is a number of branches
+ * after adding a branch.
+ */
+static struct au_branch *au_br_alloc(struct super_block *sb, int new_nbranch,
+ int perm)
+{
+ struct au_branch *add_branch;
+ struct dentry *root;
+ int err;
+
+ err = -ENOMEM;
+ root = sb->s_root;
+ add_branch = kmalloc(sizeof(*add_branch), GFP_NOFS);
+ if (unlikely(!add_branch))
+ goto out;
+
+ err = au_hnotify_init_br(add_branch, perm);
+ if (unlikely(err))
+ goto out_br;
+
+ add_branch->br_wbr = NULL;
+ if (au_br_writable(perm)) {
+ /* may be freed separately at changing the branch permission */
+ add_branch->br_wbr = kmalloc(sizeof(*add_branch->br_wbr),
+ GFP_NOFS);
+ if (unlikely(!add_branch->br_wbr))
+ goto out_hnotify;
+ }
+
+ err = au_sbr_realloc(au_sbi(sb), new_nbranch);
+ if (!err)
+ err = au_di_realloc(au_di(root), new_nbranch);
+ if (!err)
+ err = au_ii_realloc(au_ii(root->d_inode), new_nbranch);
+ if (!err)
+ return add_branch; /* success */
+
+ kfree(add_branch->br_wbr);
+
+out_hnotify:
+ au_hnotify_fin_br(add_branch);
+out_br:
+ kfree(add_branch);
+out:
+ return ERR_PTR(err);
+}
+
+/*
+ * test if the branch permission is legal or not.
+ */
+static int test_br(struct inode *inode, int brperm, char *path)
+{
+ int err;
+
+ err = (au_br_writable(brperm) && IS_RDONLY(inode));
+ if (!err)
+ goto out;
+
+ err = -EINVAL;
+ pr_err("write permission for readonly mount or inode, %s\n", path);
+
+out:
+ return err;
+}
+
+/*
+ * returns:
+ * 0: success, the caller will add it
+ * plus: success, it is already unified, the caller should ignore it
+ * minus: error
+ */
+static int test_add(struct super_block *sb, struct au_opt_add *add, int remount)
+{
+ int err;
+ aufs_bindex_t bend, bindex;
+ struct dentry *root;
+ struct inode *inode, *h_inode;
+
+ root = sb->s_root;
+ bend = au_sbend(sb);
+ if (unlikely(bend >= 0
+ && au_find_dbindex(root, add->path.dentry) >= 0)) {
+ err = 1;
+ if (!remount) {
+ err = -EINVAL;
+ pr_err("%s duplicated\n", add->pathname);
+ }
+ goto out;
+ }
+
+ err = -ENOSPC; /* -E2BIG; */
+ if (unlikely(AUFS_BRANCH_MAX <= add->bindex
+ || AUFS_BRANCH_MAX - 1 <= bend)) {
+ pr_err("number of branches exceeded %s\n", add->pathname);
+ goto out;
+ }
+
+ err = -EDOM;
+ if (unlikely(add->bindex < 0 || bend + 1 < add->bindex)) {
+ pr_err("bad index %d\n", add->bindex);
+ goto out;
+ }
+
+ inode = add->path.dentry->d_inode;
+ err = -ENOENT;
+ if (unlikely(!inode->i_nlink)) {
+ pr_err("no existence %s\n", add->pathname);
+ goto out;
+ }
+
+ err = -EINVAL;
+ if (unlikely(inode->i_sb == sb)) {
+ pr_err("%s must be outside\n", add->pathname);
+ goto out;
+ }
+
+ if (unlikely(au_test_fs_unsuppoted(inode->i_sb))) {
+ pr_err("unsupported filesystem, %s (%s)\n",
+ add->pathname, au_sbtype(inode->i_sb));
+ goto out;
+ }
+
+ err = test_br(add->path.dentry->d_inode, add->perm, add->pathname);
+ if (unlikely(err))
+ goto out;
+
+ if (bend < 0)
+ return 0; /* success */
+
+ err = -EINVAL;
+ for (bindex = 0; bindex <= bend; bindex++)
+ if (unlikely(test_overlap(sb, add->path.dentry,
+ au_h_dptr(root, bindex)))) {
+ pr_err("%s is overlapped\n", add->pathname);
+ goto out;
+ }
+
+ err = 0;
+ if (au_opt_test(au_mntflags(sb), WARN_PERM)) {
+ h_inode = au_h_dptr(root, 0)->d_inode;
+ if ((h_inode->i_mode & S_IALLUGO) != (inode->i_mode & S_IALLUGO)
+ || h_inode->i_uid != inode->i_uid
+ || h_inode->i_gid != inode->i_gid)
+ pr_warning("uid/gid/perm %s %u/%u/0%o, %u/%u/0%o\n",
+ add->pathname,
+ inode->i_uid, inode->i_gid,
+ (inode->i_mode & S_IALLUGO),
+ h_inode->i_uid, h_inode->i_gid,
+ (h_inode->i_mode & S_IALLUGO));
+ }
+
+out:
+ return err;
+}
+
+/*
+ * initialize or clean the whiteouts for an adding branch
+ */
+static int au_br_init_wh(struct super_block *sb, struct au_branch *br,
+ int new_perm, struct dentry *h_root)
+{
+ int err, old_perm;
+ aufs_bindex_t bindex;
+ struct mutex *h_mtx;
+ struct au_wbr *wbr;
+ struct au_hinode *hdir;
+
+ wbr = br->br_wbr;
+ old_perm = br->br_perm;
+ br->br_perm = new_perm;
+ hdir = NULL;
+ h_mtx = NULL;
+ bindex = au_br_index(sb, br->br_id);
+ if (0 <= bindex) {
+ hdir = au_hi(sb->s_root->d_inode, bindex);
+ au_hn_imtx_lock_nested(hdir, AuLsc_I_PARENT);
+ } else {
+ h_mtx = &h_root->d_inode->i_mutex;
+ mutex_lock_nested(h_mtx, AuLsc_I_PARENT);
+ }
+ if (!wbr)
+ err = au_wh_init(h_root, br, sb);
+ else {
+ wbr_wh_write_lock(wbr);
+ err = au_wh_init(h_root, br, sb);
+ wbr_wh_write_unlock(wbr);
+ }
+ if (hdir)
+ au_hn_imtx_unlock(hdir);
+ else
+ mutex_unlock(h_mtx);
+ br->br_perm = old_perm;
+
+ if (!err && wbr && !au_br_writable(new_perm)) {
+ kfree(wbr);
+ br->br_wbr = NULL;
+ }
+
+ return err;
+}
+
+static int au_wbr_init(struct au_branch *br, struct super_block *sb,
+ int perm, struct path *path)
+{
+ int err;
+ struct kstatfs kst;
+ struct au_wbr *wbr;
+ struct dentry *h_dentry;
+
+ wbr = br->br_wbr;
+ au_rw_init(&wbr->wbr_wh_rwsem);
+ memset(wbr->wbr_wh, 0, sizeof(wbr->wbr_wh));
+ atomic_set(&wbr->wbr_wh_running, 0);
+ wbr->wbr_bytes = 0;
+
+ /*
+ * a limit for rmdir/rename a dir
+ * cf. AUFS_MAX_NAMELEN in include/linux/aufs_type.h
+ */
+ err = vfs_statfs(path, &kst);
+ if (unlikely(err))
+ goto out;
+ err = -EINVAL;
+ h_dentry = path->dentry;
+ if (kst.f_namelen >= NAME_MAX)
+ err = au_br_init_wh(sb, br, perm, h_dentry);
+ else
+ pr_err("%.*s(%s), unsupported namelen %ld\n",
+ AuDLNPair(h_dentry), au_sbtype(h_dentry->d_sb),
+ kst.f_namelen);
+
+out:
+ return err;
+}
+
+/* intialize a new branch */
+static int au_br_init(struct au_branch *br, struct super_block *sb,
+ struct au_opt_add *add)
+{
+ int err;
+
+ err = 0;
+ memset(&br->br_xino, 0, sizeof(br->br_xino));
+ mutex_init(&br->br_xino.xi_nondir_mtx);
+ br->br_perm = add->perm;
+ br->br_mnt = add->path.mnt; /* set first, mntget() later */
+ spin_lock_init(&br->br_dykey_lock);
+ memset(br->br_dykey, 0, sizeof(br->br_dykey));
+ atomic_set(&br->br_count, 0);
+ br->br_xino_upper = AUFS_XINO_TRUNC_INIT;
+ atomic_set(&br->br_xino_running, 0);
+ br->br_id = au_new_br_id(sb);
+ AuDebugOn(br->br_id < 0);
+
+ if (au_br_writable(add->perm)) {
+ err = au_wbr_init(br, sb, add->perm, &add->path);
+ if (unlikely(err))
+ goto out_err;
+ }
+
+ if (au_opt_test(au_mntflags(sb), XINO)) {
+ err = au_xino_br(sb, br, add->path.dentry->d_inode->i_ino,
+ au_sbr(sb, 0)->br_xino.xi_file, /*do_test*/1);
+ if (unlikely(err)) {
+ AuDebugOn(br->br_xino.xi_file);
+ goto out_err;
+ }
+ }
+
+ sysaufs_br_init(br);
+ mntget(add->path.mnt);
+ goto out; /* success */
+
+out_err:
+ br->br_mnt = NULL;
+out:
+ return err;
+}
+
+static void au_br_do_add_brp(struct au_sbinfo *sbinfo, aufs_bindex_t bindex,
+ struct au_branch *br, aufs_bindex_t bend,
+ aufs_bindex_t amount)
+{
+ struct au_branch **brp;
+
+ AuRwMustWriteLock(&sbinfo->si_rwsem);
+
+ brp = sbinfo->si_branch + bindex;
+ memmove(brp + 1, brp, sizeof(*brp) * amount);
+ *brp = br;
+ sbinfo->si_bend++;
+ if (unlikely(bend < 0))
+ sbinfo->si_bend = 0;
+}
+
+static void au_br_do_add_hdp(struct au_dinfo *dinfo, aufs_bindex_t bindex,
+ aufs_bindex_t bend, aufs_bindex_t amount)
+{
+ struct au_hdentry *hdp;
+
+ AuRwMustWriteLock(&dinfo->di_rwsem);
+
+ hdp = dinfo->di_hdentry + bindex;
+ memmove(hdp + 1, hdp, sizeof(*hdp) * amount);
+ au_h_dentry_init(hdp);
+ dinfo->di_bend++;
+ if (unlikely(bend < 0))
+ dinfo->di_bstart = 0;
+}
+
+static void au_br_do_add_hip(struct au_iinfo *iinfo, aufs_bindex_t bindex,
+ aufs_bindex_t bend, aufs_bindex_t amount)
+{
+ struct au_hinode *hip;
+
+ AuRwMustWriteLock(&iinfo->ii_rwsem);
+
+ hip = iinfo->ii_hinode + bindex;
+ memmove(hip + 1, hip, sizeof(*hip) * amount);
+ hip->hi_inode = NULL;
+ au_hn_init(hip);
+ iinfo->ii_bend++;
+ if (unlikely(bend < 0))
+ iinfo->ii_bstart = 0;
+}
+
+static void au_br_do_add(struct super_block *sb, struct dentry *h_dentry,
+ struct au_branch *br, aufs_bindex_t bindex)
+{
+ struct dentry *root;
+ struct inode *root_inode;
+ aufs_bindex_t bend, amount;
+
+ root = sb->s_root;
+ root_inode = root->d_inode;
+ bend = au_sbend(sb);
+ amount = bend + 1 - bindex;
+ au_sbilist_lock();
+ au_br_do_add_brp(au_sbi(sb), bindex, br, bend, amount);
+ au_br_do_add_hdp(au_di(root), bindex, bend, amount);
+ au_br_do_add_hip(au_ii(root_inode), bindex, bend, amount);
+ au_set_h_dptr(root, bindex, dget(h_dentry));
+ au_set_h_iptr(root_inode, bindex, au_igrab(h_dentry->d_inode),
+ /*flags*/0);
+ au_sbilist_unlock();
+}
+
+int au_br_add(struct super_block *sb, struct au_opt_add *add, int remount)
+{
+ int err;
+ aufs_bindex_t bend, add_bindex;
+ struct dentry *root, *h_dentry;
+ struct inode *root_inode;
+ struct au_branch *add_branch;
+
+ root = sb->s_root;
+ root_inode = root->d_inode;
+ IMustLock(root_inode);
+ err = test_add(sb, add, remount);
+ if (unlikely(err < 0))
+ goto out;
+ if (err) {
+ err = 0;
+ goto out; /* success */
+ }
+
+ bend = au_sbend(sb);
+ add_branch = au_br_alloc(sb, bend + 2, add->perm);
+ err = PTR_ERR(add_branch);
+ if (IS_ERR(add_branch))
+ goto out;
+
+ err = au_br_init(add_branch, sb, add);
+ if (unlikely(err)) {
+ au_br_do_free(add_branch);
+ goto out;
+ }
+
+ add_bindex = add->bindex;
+ h_dentry = add->path.dentry;
+ if (!remount)
+ au_br_do_add(sb, h_dentry, add_branch, add_bindex);
+ else {
+ sysaufs_brs_del(sb, add_bindex);
+ au_br_do_add(sb, h_dentry, add_branch, add_bindex);
+ sysaufs_brs_add(sb, add_bindex);
+ }
+
+ if (!add_bindex) {
+ au_cpup_attr_all(root_inode, /*force*/1);
+ sb->s_maxbytes = h_dentry->d_sb->s_maxbytes;
+ } else
+ au_add_nlink(root_inode, h_dentry->d_inode);
+
+ /*
+ * this test/set prevents aufs from handling unnecesary notify events
+ * of xino files, in case of re-adding a writable branch which was
+ * once detached from aufs.
+ */
+ if (au_xino_brid(sb) < 0
+ && au_br_writable(add_branch->br_perm)
+ && !au_test_fs_bad_xino(h_dentry->d_sb)
+ && add_branch->br_xino.xi_file
+ && add_branch->br_xino.xi_file->f_dentry->d_parent == h_dentry)
+ au_xino_brid_set(sb, add_branch->br_id);
+
+out:
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * delete a branch
+ */
+
+/* to show the line number, do not make it inlined function */
+#define AuVerbose(do_info, fmt, ...) do { \
+ if (do_info) \
+ pr_info(fmt, ##__VA_ARGS__); \
+} while (0)
+
+static int au_test_ibusy(struct inode *inode, aufs_bindex_t bstart,
+ aufs_bindex_t bend)
+{
+ return (inode && !S_ISDIR(inode->i_mode)) || bstart == bend;
+}
+
+static int au_test_dbusy(struct dentry *dentry, aufs_bindex_t bstart,
+ aufs_bindex_t bend)
+{
+ return au_test_ibusy(dentry->d_inode, bstart, bend);
+}
+
+/*
+ * test if the branch is deletable or not.
+ */
+static int test_dentry_busy(struct dentry *root, aufs_bindex_t bindex,
+ unsigned int sigen, const unsigned int verbose)
+{
+ int err, i, j, ndentry;
+ aufs_bindex_t bstart, bend;
+ struct au_dcsub_pages dpages;
+ struct au_dpage *dpage;
+ struct dentry *d;
+
+ err = au_dpages_init(&dpages, GFP_NOFS);
+ if (unlikely(err))
+ goto out;
+ err = au_dcsub_pages(&dpages, root, NULL, NULL);
+ if (unlikely(err))
+ goto out_dpages;
+
+ for (i = 0; !err && i < dpages.ndpage; i++) {
+ dpage = dpages.dpages + i;
+ ndentry = dpage->ndentry;
+ for (j = 0; !err && j < ndentry; j++) {
+ d = dpage->dentries[j];
+ AuDebugOn(!d->d_count);
+ if (!au_digen_test(d, sigen)) {
+ di_read_lock_child(d, AuLock_IR);
+ if (unlikely(au_dbrange_test(d))) {
+ di_read_unlock(d, AuLock_IR);
+ continue;
+ }
+ } else {
+ di_write_lock_child(d);
+ if (unlikely(au_dbrange_test(d))) {
+ di_write_unlock(d);
+ continue;
+ }
+ err = au_reval_dpath(d, sigen);
+ if (!err)
+ di_downgrade_lock(d, AuLock_IR);
+ else {
+ di_write_unlock(d);
+ break;
+ }
+ }
+
+ /* AuDbgDentry(d); */
+ bstart = au_dbstart(d);
+ bend = au_dbend(d);
+ if (bstart <= bindex
+ && bindex <= bend
+ && au_h_dptr(d, bindex)
+ && au_test_dbusy(d, bstart, bend)) {
+ err = -EBUSY;
+ AuVerbose(verbose, "busy %.*s\n", AuDLNPair(d));
+ AuDbgDentry(d);
+ }
+ di_read_unlock(d, AuLock_IR);
+ }
+ }
+
+out_dpages:
+ au_dpages_free(&dpages);
+out:
+ return err;
+}
+
+static int test_inode_busy(struct super_block *sb, aufs_bindex_t bindex,
+ unsigned int sigen, const unsigned int verbose)
+{
+ int err;
+ unsigned long long max, ull;
+ struct inode *i, **array;
+ aufs_bindex_t bstart, bend;
+
+ array = au_iarray_alloc(sb, &max);
+ err = PTR_ERR(array);
+ if (IS_ERR(array))
+ goto out;
+
+ err = 0;
+ AuDbg("b%d\n", bindex);
+ for (ull = 0; !err && ull < max; ull++) {
+ i = array[ull];
+ if (i->i_ino == AUFS_ROOT_INO)
+ continue;
+
+ /* AuDbgInode(i); */
+ if (au_iigen(i) == sigen)
+ ii_read_lock_child(i);
+ else {
+ ii_write_lock_child(i);
+ err = au_refresh_hinode_self(i);
+ au_iigen_dec(i);
+ if (!err)
+ ii_downgrade_lock(i);
+ else {
+ ii_write_unlock(i);
+ break;
+ }
+ }
+
+ bstart = au_ibstart(i);
+ bend = au_ibend(i);
+ if (bstart <= bindex
+ && bindex <= bend
+ && au_h_iptr(i, bindex)
+ && au_test_ibusy(i, bstart, bend)) {
+ err = -EBUSY;
+ AuVerbose(verbose, "busy i%lu\n", i->i_ino);
+ AuDbgInode(i);
+ }
+ ii_read_unlock(i);
+ }
+ au_iarray_free(array, max);
+
+out:
+ return err;
+}
+
+static int test_children_busy(struct dentry *root, aufs_bindex_t bindex,
+ const unsigned int verbose)
+{
+ int err;
+ unsigned int sigen;
+
+ sigen = au_sigen(root->d_sb);
+ DiMustNoWaiters(root);
+ IiMustNoWaiters(root->d_inode);
+ di_write_unlock(root);
+ err = test_dentry_busy(root, bindex, sigen, verbose);
+ if (!err)
+ err = test_inode_busy(root->d_sb, bindex, sigen, verbose);
+ di_write_lock_child(root); /* aufs_write_lock() calls ..._child() */
+
+ return err;
+}
+
+static void au_br_do_del_brp(struct au_sbinfo *sbinfo,
+ const aufs_bindex_t bindex,
+ const aufs_bindex_t bend)
+{
+ struct au_branch **brp, **p;
+
+ AuRwMustWriteLock(&sbinfo->si_rwsem);
+
+ brp = sbinfo->si_branch + bindex;
+ if (bindex < bend)
+ memmove(brp, brp + 1, sizeof(*brp) * (bend - bindex));
+ sbinfo->si_branch[0 + bend] = NULL;
+ sbinfo->si_bend--;
+
+ p = krealloc(sbinfo->si_branch, sizeof(*p) * bend, AuGFP_SBILIST);
+ if (p)
+ sbinfo->si_branch = p;
+ /* harmless error */
+}
+
+static void au_br_do_del_hdp(struct au_dinfo *dinfo, const aufs_bindex_t bindex,
+ const aufs_bindex_t bend)
+{
+ struct au_hdentry *hdp, *p;
+
+ AuRwMustWriteLock(&dinfo->di_rwsem);
+
+ hdp = dinfo->di_hdentry;
+ if (bindex < bend)
+ memmove(hdp + bindex, hdp + bindex + 1,
+ sizeof(*hdp) * (bend - bindex));
+ hdp[0 + bend].hd_dentry = NULL;
+ dinfo->di_bend--;
+
+ p = krealloc(hdp, sizeof(*p) * bend, AuGFP_SBILIST);
+ if (p)
+ dinfo->di_hdentry = p;
+ /* harmless error */
+}
+
+static void au_br_do_del_hip(struct au_iinfo *iinfo, const aufs_bindex_t bindex,
+ const aufs_bindex_t bend)
+{
+ struct au_hinode *hip, *p;
+
+ AuRwMustWriteLock(&iinfo->ii_rwsem);
+
+ hip = iinfo->ii_hinode + bindex;
+ if (bindex < bend)
+ memmove(hip, hip + 1, sizeof(*hip) * (bend - bindex));
+ iinfo->ii_hinode[0 + bend].hi_inode = NULL;
+ au_hn_init(iinfo->ii_hinode + bend);
+ iinfo->ii_bend--;
+
+ p = krealloc(iinfo->ii_hinode, sizeof(*p) * bend, AuGFP_SBILIST);
+ if (p)
+ iinfo->ii_hinode = p;
+ /* harmless error */
+}
+
+static void au_br_do_del(struct super_block *sb, aufs_bindex_t bindex,
+ struct au_branch *br)
+{
+ aufs_bindex_t bend;
+ struct au_sbinfo *sbinfo;
+ struct dentry *root, *h_root;
+ struct inode *inode, *h_inode;
+ struct au_hinode *hinode;
+
+ SiMustWriteLock(sb);
+
+ root = sb->s_root;
+ inode = root->d_inode;
+ sbinfo = au_sbi(sb);
+ bend = sbinfo->si_bend;
+
+ h_root = au_h_dptr(root, bindex);
+ hinode = au_hi(inode, bindex);
+ h_inode = au_igrab(hinode->hi_inode);
+ au_hiput(hinode);
+
+ au_sbilist_lock();
+ au_br_do_del_brp(sbinfo, bindex, bend);
+ au_br_do_del_hdp(au_di(root), bindex, bend);
+ au_br_do_del_hip(au_ii(inode), bindex, bend);
+ au_sbilist_unlock();
+
+ dput(h_root);
+ iput(h_inode);
+ au_br_do_free(br);
+}
+
+int au_br_del(struct super_block *sb, struct au_opt_del *del, int remount)
+{
+ int err, rerr, i;
+ unsigned int mnt_flags;
+ aufs_bindex_t bindex, bend, br_id;
+ unsigned char do_wh, verbose;
+ struct au_branch *br;
+ struct au_wbr *wbr;
+
+ err = 0;
+ bindex = au_find_dbindex(sb->s_root, del->h_path.dentry);
+ if (bindex < 0) {
+ if (remount)
+ goto out; /* success */
+ err = -ENOENT;
+ pr_err("%s no such branch\n", del->pathname);
+ goto out;
+ }
+ AuDbg("bindex b%d\n", bindex);
+
+ err = -EBUSY;
+ mnt_flags = au_mntflags(sb);
+ verbose = !!au_opt_test(mnt_flags, VERBOSE);
+ bend = au_sbend(sb);
+ if (unlikely(!bend)) {
+ AuVerbose(verbose, "no more branches left\n");
+ goto out;
+ }
+ br = au_sbr(sb, bindex);
+ i = atomic_read(&br->br_count);
+ if (unlikely(i)) {
+ AuVerbose(verbose, "%d file(s) opened\n", i);
+ goto out;
+ }
+
+ wbr = br->br_wbr;
+ do_wh = wbr && (wbr->wbr_whbase || wbr->wbr_plink || wbr->wbr_orph);
+ if (do_wh) {
+ /* instead of WbrWhMustWriteLock(wbr) */
+ SiMustWriteLock(sb);
+ for (i = 0; i < AuBrWh_Last; i++) {
+ dput(wbr->wbr_wh[i]);
+ wbr->wbr_wh[i] = NULL;
+ }
+ }
+
+ err = test_children_busy(sb->s_root, bindex, verbose);
+ if (unlikely(err)) {
+ if (do_wh)
+ goto out_wh;
+ goto out;
+ }
+
+ err = 0;
+ br_id = br->br_id;
+ if (!remount)
+ au_br_do_del(sb, bindex, br);
+ else {
+ sysaufs_brs_del(sb, bindex);
+ au_br_do_del(sb, bindex, br);
+ sysaufs_brs_add(sb, bindex);
+ }
+
+ if (!bindex) {
+ au_cpup_attr_all(sb->s_root->d_inode, /*force*/1);
+ sb->s_maxbytes = au_sbr_sb(sb, 0)->s_maxbytes;
+ } else
+ au_sub_nlink(sb->s_root->d_inode, del->h_path.dentry->d_inode);
+ if (au_opt_test(mnt_flags, PLINK))
+ au_plink_half_refresh(sb, br_id);
+
+ if (au_xino_brid(sb) == br_id)
+ au_xino_brid_set(sb, -1);
+ goto out; /* success */
+
+out_wh:
+ /* revert */
+ rerr = au_br_init_wh(sb, br, br->br_perm, del->h_path.dentry);
+ if (rerr)
+ pr_warning("failed re-creating base whiteout, %s. (%d)\n",
+ del->pathname, rerr);
+out:
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int au_ibusy(struct super_block *sb, struct aufs_ibusy __user *arg)
+{
+ int err;
+ aufs_bindex_t bstart, bend;
+ struct aufs_ibusy ibusy;
+ struct inode *inode, *h_inode;
+
+ err = -EPERM;
+ if (unlikely(!capable(CAP_SYS_ADMIN)))
+ goto out;
+
+ err = copy_from_user(&ibusy, arg, sizeof(ibusy));
+ if (!err)
+ err = !access_ok(VERIFY_WRITE, &arg->h_ino, sizeof(arg->h_ino));
+ if (unlikely(err)) {
+ err = -EFAULT;
+ AuTraceErr(err);
+ goto out;
+ }
+
+ err = -EINVAL;
+ si_read_lock(sb, AuLock_FLUSH);
+ if (unlikely(ibusy.bindex < 0 || ibusy.bindex > au_sbend(sb)))
+ goto out_unlock;
+
+ err = 0;
+ ibusy.h_ino = 0; /* invalid */
+ inode = ilookup(sb, ibusy.ino);
+ if (!inode
+ || inode->i_ino == AUFS_ROOT_INO
+ || is_bad_inode(inode))
+ goto out_unlock;
+
+ ii_read_lock_child(inode);
+ bstart = au_ibstart(inode);
+ bend = au_ibend(inode);
+ if (bstart <= ibusy.bindex && ibusy.bindex <= bend) {
+ h_inode = au_h_iptr(inode, ibusy.bindex);
+ if (h_inode && au_test_ibusy(inode, bstart, bend))
+ ibusy.h_ino = h_inode->i_ino;
+ }
+ ii_read_unlock(inode);
+ iput(inode);
+
+out_unlock:
+ si_read_unlock(sb);
+ if (!err) {
+ err = __put_user(ibusy.h_ino, &arg->h_ino);
+ if (unlikely(err)) {
+ err = -EFAULT;
+ AuTraceErr(err);
+ }
+ }
+out:
+ return err;
+}
+
+long au_ibusy_ioctl(struct file *file, unsigned long arg)
+{
+ return au_ibusy(file->f_dentry->d_sb, (void __user *)arg);
+}
+
+#ifdef CONFIG_COMPAT
+long au_ibusy_compat_ioctl(struct file *file, unsigned long arg)
+{
+ return au_ibusy(file->f_dentry->d_sb, compat_ptr(arg));
+}
+#endif
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * change a branch permission
+ */
+
+static void au_warn_ima(void)
+{
+#ifdef CONFIG_IMA
+ /* since it doesn't support mark_files_ro() */
+ AuWarn1("RW -> RO makes IMA to produce wrong message\n");
+#endif
+}
+
+static int do_need_sigen_inc(int a, int b)
+{
+ return au_br_whable(a) && !au_br_whable(b);
+}
+
+static int need_sigen_inc(int old, int new)
+{
+ return do_need_sigen_inc(old, new)
+ || do_need_sigen_inc(new, old);
+}
+
+static unsigned long long au_farray_cb(void *a,
+ unsigned long long max __maybe_unused,
+ void *arg)
+{
+ unsigned long long n;
+ struct file **p, *f;
+ struct super_block *sb = arg;
+
+ n = 0;
+ p = a;
+ lg_global_lock(files_lglock);
+ do_file_list_for_each_entry(sb, f) {
+ if (au_fi(f)
+ && file_count(f)
+ && !special_file(f->f_dentry->d_inode->i_mode)) {
+ get_file(f);
+ *p++ = f;
+ n++;
+ AuDebugOn(n > max);
+ }
+ } while_file_list_for_each_entry;
+ lg_global_unlock(files_lglock);
+
+ return n;
+}
+
+static struct file **au_farray_alloc(struct super_block *sb,
+ unsigned long long *max)
+{
+ *max = atomic_long_read(&au_sbi(sb)->si_nfiles);
+ return au_array_alloc(max, au_farray_cb, sb);
+}
+
+static void au_farray_free(struct file **a, unsigned long long max)
+{
+ unsigned long long ull;
+
+ for (ull = 0; ull < max; ull++)
+ if (a[ull])
+ fput(a[ull]);
+ au_array_free(a);
+}
+
+static int au_br_mod_files_ro(struct super_block *sb, aufs_bindex_t bindex)
+{
+ int err, do_warn;
+ unsigned int mnt_flags;
+ unsigned long long ull, max;
+ aufs_bindex_t br_id;
+ unsigned char verbose;
+ struct file *file, *hf, **array;
+ struct inode *inode;
+ struct au_hfile *hfile;
+
+ mnt_flags = au_mntflags(sb);
+ verbose = !!au_opt_test(mnt_flags, VERBOSE);
+
+ array = au_farray_alloc(sb, &max);
+ err = PTR_ERR(array);
+ if (IS_ERR(array))
+ goto out;
+
+ do_warn = 0;
+ br_id = au_sbr_id(sb, bindex);
+ for (ull = 0; ull < max; ull++) {
+ file = array[ull];
+
+ /* AuDbg("%.*s\n", AuDLNPair(file->f_dentry)); */
+ fi_read_lock(file);
+ if (unlikely(au_test_mmapped(file))) {
+ err = -EBUSY;
+ AuVerbose(verbose, "mmapped %.*s\n",
+ AuDLNPair(file->f_dentry));
+ AuDbgFile(file);
+ FiMustNoWaiters(file);
+ fi_read_unlock(file);
+ goto out_array;
+ }
+
+ inode = file->f_dentry->d_inode;
+ hfile = &au_fi(file)->fi_htop;
+ hf = hfile->hf_file;
+ if (!S_ISREG(inode->i_mode)
+ || !(file->f_mode & FMODE_WRITE)
+ || hfile->hf_br->br_id != br_id
+ || !(hf->f_mode & FMODE_WRITE))
+ array[ull] = NULL;
+ else {
+ do_warn = 1;
+ get_file(file);
+ }
+
+ FiMustNoWaiters(file);
+ fi_read_unlock(file);
+ fput(file);
+ }
+
+ err = 0;
+ if (do_warn)
+ au_warn_ima();
+
+ for (ull = 0; ull < max; ull++) {
+ file = array[ull];
+ if (!file)
+ continue;
+
+ /* todo: already flushed? */
+ /* cf. fs/super.c:mark_files_ro() */
+ /* fi_read_lock(file); */
+ hfile = &au_fi(file)->fi_htop;
+ hf = hfile->hf_file;
+ /* fi_read_unlock(file); */
+ spin_lock(&hf->f_lock);
+ hf->f_mode &= ~FMODE_WRITE;
+ spin_unlock(&hf->f_lock);
+ if (!file_check_writeable(hf)) {
+ file_release_write(hf);
+ mnt_drop_write(hf->f_vfsmnt);
+ }
+ }
+
+out_array:
+ au_farray_free(array, max);
+out:
+ AuTraceErr(err);
+ return err;
+}
+
+int au_br_mod(struct super_block *sb, struct au_opt_mod *mod, int remount,
+ int *do_refresh)
+{
+ int err, rerr;
+ aufs_bindex_t bindex;
+ struct path path;
+ struct dentry *root;
+ struct au_branch *br;
+
+ root = sb->s_root;
+ bindex = au_find_dbindex(root, mod->h_root);
+ if (bindex < 0) {
+ if (remount)
+ return 0; /* success */
+ err = -ENOENT;
+ pr_err("%s no such branch\n", mod->path);
+ goto out;
+ }
+ AuDbg("bindex b%d\n", bindex);
+
+ err = test_br(mod->h_root->d_inode, mod->perm, mod->path);
+ if (unlikely(err))
+ goto out;
+
+ br = au_sbr(sb, bindex);
+ if (br->br_perm == mod->perm)
+ return 0; /* success */
+
+ if (au_br_writable(br->br_perm)) {
+ /* remove whiteout base */
+ err = au_br_init_wh(sb, br, mod->perm, mod->h_root);
+ if (unlikely(err))
+ goto out;
+
+ if (!au_br_writable(mod->perm)) {
+ /* rw --> ro, file might be mmapped */
+ DiMustNoWaiters(root);
+ IiMustNoWaiters(root->d_inode);
+ di_write_unlock(root);
+ err = au_br_mod_files_ro(sb, bindex);
+ /* aufs_write_lock() calls ..._child() */
+ di_write_lock_child(root);
+
+ if (unlikely(err)) {
+ rerr = -ENOMEM;
+ br->br_wbr = kmalloc(sizeof(*br->br_wbr),
+ GFP_NOFS);
+ if (br->br_wbr) {
+ path.mnt = br->br_mnt;
+ path.dentry = mod->h_root;
+ rerr = au_wbr_init(br, sb, br->br_perm,
+ &path);
+ }
+ if (unlikely(rerr)) {
+ AuIOErr("nested error %d (%d)\n",
+ rerr, err);
+ br->br_perm = mod->perm;
+ }
+ }
+ }
+ } else if (au_br_writable(mod->perm)) {
+ /* ro --> rw */
+ err = -ENOMEM;
+ br->br_wbr = kmalloc(sizeof(*br->br_wbr), GFP_NOFS);
+ if (br->br_wbr) {
+ path.mnt = br->br_mnt;
+ path.dentry = mod->h_root;
+ err = au_wbr_init(br, sb, mod->perm, &path);
+ if (unlikely(err)) {
+ kfree(br->br_wbr);
+ br->br_wbr = NULL;
+ }
+ }
+ }
+
+ if (!err) {
+ *do_refresh |= need_sigen_inc(br->br_perm, mod->perm);
+ br->br_perm = mod->perm;
+ }
+
+out:
+ AuTraceErr(err);
+ return err;
+}
diff -urN a/fs/aufs/branch.h b/fs/aufs/branch.h
--- a/fs/aufs/branch.h 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/branch.h 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,230 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * branch filesystems and xino for them
+ */
+
+#ifndef __AUFS_BRANCH_H__
+#define __AUFS_BRANCH_H__
+
+#ifdef __KERNEL__
+
+#include <linux/mount.h>
+#include "dynop.h"
+#include "rwsem.h"
+#include "super.h"
+
+/* ---------------------------------------------------------------------- */
+
+/* a xino file */
+struct au_xino_file {
+ struct file *xi_file;
+ struct mutex xi_nondir_mtx;
+
+ /* todo: make xino files an array to support huge inode number */
+
+#ifdef CONFIG_DEBUG_FS
+ struct dentry *xi_dbgaufs;
+#endif
+};
+
+/* members for writable branch only */
+enum {AuBrWh_BASE, AuBrWh_PLINK, AuBrWh_ORPH, AuBrWh_Last};
+struct au_wbr {
+ struct au_rwsem wbr_wh_rwsem;
+ struct dentry *wbr_wh[AuBrWh_Last];
+ atomic_t wbr_wh_running;
+#define wbr_whbase wbr_wh[AuBrWh_BASE] /* whiteout base */
+#define wbr_plink wbr_wh[AuBrWh_PLINK] /* pseudo-link dir */
+#define wbr_orph wbr_wh[AuBrWh_ORPH] /* dir for orphans */
+
+ /* mfs mode */
+ unsigned long long wbr_bytes;
+};
+
+/* ext2 has 3 types of operations at least, ext3 has 4 */
+#define AuBrDynOp (AuDyLast * 4)
+
+/* protected by superblock rwsem */
+struct au_branch {
+ struct au_xino_file br_xino;
+
+ aufs_bindex_t br_id;
+
+ int br_perm;
+ struct vfsmount *br_mnt;
+ spinlock_t br_dykey_lock;
+ struct au_dykey *br_dykey[AuBrDynOp];
+ atomic_t br_count;
+
+ struct au_wbr *br_wbr;
+
+ /* xino truncation */
+ blkcnt_t br_xino_upper; /* watermark in blocks */
+ atomic_t br_xino_running;
+
+#ifdef CONFIG_AUFS_HFSNOTIFY
+ struct fsnotify_group *br_hfsn_group;
+ struct fsnotify_ops br_hfsn_ops;
+#endif
+
+#ifdef CONFIG_SYSFS
+ /* an entry under sysfs per mount-point */
+ char br_name[8];
+ struct attribute br_attr;
+#endif
+};
+
+/* ---------------------------------------------------------------------- */
+
+/* branch permissions and attributes */
+#define AuBrPerm_RW 1 /* writable, hardlinkable wh */
+#define AuBrPerm_RO (1 << 1) /* readonly */
+#define AuBrPerm_RR (1 << 2) /* natively readonly */
+#define AuBrPerm_Mask (AuBrPerm_RW | AuBrPerm_RO | AuBrPerm_RR)
+
+#define AuBrRAttr_WH (1 << 3) /* whiteout-able */
+
+#define AuBrWAttr_NoLinkWH (1 << 4) /* un-hardlinkable whiteouts */
+
+static inline int au_br_writable(int brperm)
+{
+ return brperm & AuBrPerm_RW;
+}
+
+static inline int au_br_whable(int brperm)
+{
+ return brperm & (AuBrPerm_RW | AuBrRAttr_WH);
+}
+
+static inline int au_br_wh_linkable(int brperm)
+{
+ return !(brperm & AuBrWAttr_NoLinkWH);
+}
+
+static inline int au_br_rdonly(struct au_branch *br)
+{
+ return ((br->br_mnt->mnt_sb->s_flags & MS_RDONLY)
+ || !au_br_writable(br->br_perm))
+ ? -EROFS : 0;
+}
+
+static inline int au_br_hnotifyable(int brperm __maybe_unused)
+{
+#ifdef CONFIG_AUFS_HNOTIFY
+ return !(brperm & AuBrPerm_RR);
+#else
+ return 0;
+#endif
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* branch.c */
+struct au_sbinfo;
+void au_br_free(struct au_sbinfo *sinfo);
+int au_br_index(struct super_block *sb, aufs_bindex_t br_id);
+struct au_opt_add;
+int au_br_add(struct super_block *sb, struct au_opt_add *add, int remount);
+struct au_opt_del;
+int au_br_del(struct super_block *sb, struct au_opt_del *del, int remount);
+long au_ibusy_ioctl(struct file *file, unsigned long arg);
+#ifdef CONFIG_COMPAT
+long au_ibusy_compat_ioctl(struct file *file, unsigned long arg);
+#endif
+struct au_opt_mod;
+int au_br_mod(struct super_block *sb, struct au_opt_mod *mod, int remount,
+ int *do_refresh);
+
+/* xino.c */
+static const loff_t au_loff_max = LLONG_MAX;
+
+int au_xib_trunc(struct super_block *sb);
+ssize_t xino_fread(au_readf_t func, struct file *file, void *buf, size_t size,
+ loff_t *pos);
+ssize_t xino_fwrite(au_writef_t func, struct file *file, void *buf, size_t size,
+ loff_t *pos);
+struct file *au_xino_create2(struct file *base_file, struct file *copy_src);
+struct file *au_xino_create(struct super_block *sb, char *fname, int silent);
+ino_t au_xino_new_ino(struct super_block *sb);
+void au_xino_delete_inode(struct inode *inode, const int unlinked);
+int au_xino_write(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
+ ino_t ino);
+int au_xino_read(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
+ ino_t *ino);
+int au_xino_br(struct super_block *sb, struct au_branch *br, ino_t hino,
+ struct file *base_file, int do_test);
+int au_xino_trunc(struct super_block *sb, aufs_bindex_t bindex);
+
+struct au_opt_xino;
+int au_xino_set(struct super_block *sb, struct au_opt_xino *xino, int remount);
+void au_xino_clr(struct super_block *sb);
+struct file *au_xino_def(struct super_block *sb);
+int au_xino_path(struct seq_file *seq, struct file *file);
+
+/* ---------------------------------------------------------------------- */
+
+/* Superblock to branch */
+static inline
+aufs_bindex_t au_sbr_id(struct super_block *sb, aufs_bindex_t bindex)
+{
+ return au_sbr(sb, bindex)->br_id;
+}
+
+static inline
+struct vfsmount *au_sbr_mnt(struct super_block *sb, aufs_bindex_t bindex)
+{
+ return au_sbr(sb, bindex)->br_mnt;
+}
+
+static inline
+struct super_block *au_sbr_sb(struct super_block *sb, aufs_bindex_t bindex)
+{
+ return au_sbr_mnt(sb, bindex)->mnt_sb;
+}
+
+static inline void au_sbr_put(struct super_block *sb, aufs_bindex_t bindex)
+{
+ atomic_dec(&au_sbr(sb, bindex)->br_count);
+}
+
+static inline int au_sbr_perm(struct super_block *sb, aufs_bindex_t bindex)
+{
+ return au_sbr(sb, bindex)->br_perm;
+}
+
+static inline int au_sbr_whable(struct super_block *sb, aufs_bindex_t bindex)
+{
+ return au_br_whable(au_sbr_perm(sb, bindex));
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * wbr_wh_read_lock, wbr_wh_write_lock
+ * wbr_wh_read_unlock, wbr_wh_write_unlock, wbr_wh_downgrade_lock
+ */
+AuSimpleRwsemFuncs(wbr_wh, struct au_wbr *wbr, &wbr->wbr_wh_rwsem);
+
+#define WbrWhMustNoWaiters(wbr) AuRwMustNoWaiters(&wbr->wbr_wh_rwsem)
+#define WbrWhMustAnyLock(wbr) AuRwMustAnyLock(&wbr->wbr_wh_rwsem)
+#define WbrWhMustWriteLock(wbr) AuRwMustWriteLock(&wbr->wbr_wh_rwsem)
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_BRANCH_H__ */
diff -urN a/fs/aufs/conf.mk b/fs/aufs/conf.mk
--- a/fs/aufs/conf.mk 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/conf.mk 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,38 @@
+
+AuConfStr = CONFIG_AUFS_FS=${CONFIG_AUFS_FS}
+
+define AuConf
+ifdef ${1}
+AuConfStr += ${1}=${${1}}
+endif
+endef
+
+AuConfAll = BRANCH_MAX_127 BRANCH_MAX_511 BRANCH_MAX_1023 BRANCH_MAX_32767 \
+ SBILIST \
+ HNOTIFY HFSNOTIFY \
+ EXPORT INO_T_64 \
+ RDU \
+ PROC_MAP \
+ SP_IATTR \
+ SHWH \
+ BR_RAMFS \
+ BR_FUSE POLL \
+ BR_HFSPLUS \
+ BDEV_LOOP \
+ DEBUG MAGIC_SYSRQ
+$(foreach i, ${AuConfAll}, \
+ $(eval $(call AuConf,CONFIG_AUFS_${i})))
+
+AuConfName = ${obj}/conf.str
+${AuConfName}.tmp: FORCE
+ @echo ${AuConfStr} | tr ' ' '\n' | sed -e 's/^/"/' -e 's/$$/\\n"/' > $@
+${AuConfName}: ${AuConfName}.tmp
+ @diff -q $< $@ > /dev/null 2>&1 || { \
+ echo ' GEN ' $@; \
+ cp -p $< $@; \
+ }
+FORCE:
+clean-files += ${AuConfName} ${AuConfName}.tmp
+${obj}/sysfs.o: ${AuConfName}
+
+-include ${srctree}/${src}/conf_priv.mk
diff -urN a/fs/aufs/cpup.c b/fs/aufs/cpup.c
--- a/fs/aufs/cpup.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/cpup.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,1079 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * copy-up functions, see wbr_policy.c for copy-down
+ */
+
+#include <linux/fs_stack.h>
+#include <linux/mm.h>
+#include "aufs.h"
+
+void au_cpup_attr_flags(struct inode *dst, struct inode *src)
+{
+ const unsigned int mask = S_DEAD | S_SWAPFILE | S_PRIVATE
+ | S_NOATIME | S_NOCMTIME;
+
+ dst->i_flags |= src->i_flags & ~mask;
+ if (au_test_fs_notime(dst->i_sb))
+ dst->i_flags |= S_NOATIME | S_NOCMTIME;
+}
+
+void au_cpup_attr_timesizes(struct inode *inode)
+{
+ struct inode *h_inode;
+
+ h_inode = au_h_iptr(inode, au_ibstart(inode));
+ fsstack_copy_attr_times(inode, h_inode);
+ fsstack_copy_inode_size(inode, h_inode);
+}
+
+void au_cpup_attr_nlink(struct inode *inode, int force)
+{
+ struct inode *h_inode;
+ struct super_block *sb;
+ aufs_bindex_t bindex, bend;
+
+ sb = inode->i_sb;
+ bindex = au_ibstart(inode);
+ h_inode = au_h_iptr(inode, bindex);
+ if (!force
+ && !S_ISDIR(h_inode->i_mode)
+ && au_opt_test(au_mntflags(sb), PLINK)
+ && au_plink_test(inode))
+ return;
+
+ set_nlink(inode, h_inode->i_nlink);
+
+ /*
+ * fewer nlink makes find(1) noisy, but larger nlink doesn't.
+ * it may includes whplink directory.
+ */
+ if (S_ISDIR(h_inode->i_mode)) {
+ bend = au_ibend(inode);
+ for (bindex++; bindex <= bend; bindex++) {
+ h_inode = au_h_iptr(inode, bindex);
+ if (h_inode)
+ au_add_nlink(inode, h_inode);
+ }
+ }
+}
+
+void au_cpup_attr_changeable(struct inode *inode)
+{
+ struct inode *h_inode;
+
+ h_inode = au_h_iptr(inode, au_ibstart(inode));
+ inode->i_mode = h_inode->i_mode;
+ inode->i_uid = h_inode->i_uid;
+ inode->i_gid = h_inode->i_gid;
+ au_cpup_attr_timesizes(inode);
+ au_cpup_attr_flags(inode, h_inode);
+}
+
+void au_cpup_igen(struct inode *inode, struct inode *h_inode)
+{
+ struct au_iinfo *iinfo = au_ii(inode);
+
+ IiMustWriteLock(inode);
+
+ iinfo->ii_higen = h_inode->i_generation;
+ iinfo->ii_hsb1 = h_inode->i_sb;
+}
+
+void au_cpup_attr_all(struct inode *inode, int force)
+{
+ struct inode *h_inode;
+
+ h_inode = au_h_iptr(inode, au_ibstart(inode));
+ au_cpup_attr_changeable(inode);
+ if (inode->i_nlink > 0)
+ au_cpup_attr_nlink(inode, force);
+ inode->i_rdev = h_inode->i_rdev;
+ inode->i_blkbits = h_inode->i_blkbits;
+ au_cpup_igen(inode, h_inode);
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* Note: dt_dentry and dt_h_dentry are not dget/dput-ed */
+
+/* keep the timestamps of the parent dir when cpup */
+void au_dtime_store(struct au_dtime *dt, struct dentry *dentry,
+ struct path *h_path)
+{
+ struct inode *h_inode;
+
+ dt->dt_dentry = dentry;
+ dt->dt_h_path = *h_path;
+ h_inode = h_path->dentry->d_inode;
+ dt->dt_atime = h_inode->i_atime;
+ dt->dt_mtime = h_inode->i_mtime;
+ /* smp_mb(); */
+}
+
+void au_dtime_revert(struct au_dtime *dt)
+{
+ struct iattr attr;
+ int err;
+
+ attr.ia_atime = dt->dt_atime;
+ attr.ia_mtime = dt->dt_mtime;
+ attr.ia_valid = ATTR_FORCE | ATTR_MTIME | ATTR_MTIME_SET
+ | ATTR_ATIME | ATTR_ATIME_SET;
+
+ err = vfsub_notify_change(&dt->dt_h_path, &attr);
+ if (unlikely(err))
+ pr_warning("restoring timestamps failed(%d). ignored\n", err);
+}
+
+/* ---------------------------------------------------------------------- */
+
+static noinline_for_stack
+int cpup_iattr(struct dentry *dst, aufs_bindex_t bindex, struct dentry *h_src)
+{
+ int err, sbits;
+ struct iattr ia;
+ struct path h_path;
+ struct inode *h_isrc, *h_idst;
+
+ h_path.dentry = au_h_dptr(dst, bindex);
+ h_idst = h_path.dentry->d_inode;
+ h_path.mnt = au_sbr_mnt(dst->d_sb, bindex);
+ h_isrc = h_src->d_inode;
+ ia.ia_valid = ATTR_FORCE | ATTR_UID | ATTR_GID
+ | ATTR_ATIME | ATTR_MTIME
+ | ATTR_ATIME_SET | ATTR_MTIME_SET;
+ ia.ia_uid = h_isrc->i_uid;
+ ia.ia_gid = h_isrc->i_gid;
+ ia.ia_atime = h_isrc->i_atime;
+ ia.ia_mtime = h_isrc->i_mtime;
+ if (h_idst->i_mode != h_isrc->i_mode
+ && !S_ISLNK(h_idst->i_mode)) {
+ ia.ia_valid |= ATTR_MODE;
+ ia.ia_mode = h_isrc->i_mode;
+ }
+ sbits = !!(h_isrc->i_mode & (S_ISUID | S_ISGID));
+ au_cpup_attr_flags(h_idst, h_isrc);
+ err = vfsub_notify_change(&h_path, &ia);
+
+ /* is this nfs only? */
+ if (!err && sbits && au_test_nfs(h_path.dentry->d_sb)) {
+ ia.ia_valid = ATTR_FORCE | ATTR_MODE;
+ ia.ia_mode = h_isrc->i_mode;
+ err = vfsub_notify_change(&h_path, &ia);
+ }
+
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int au_do_copy_file(struct file *dst, struct file *src, loff_t len,
+ char *buf, unsigned long blksize)
+{
+ int err;
+ size_t sz, rbytes, wbytes;
+ unsigned char all_zero;
+ char *p, *zp;
+ struct mutex *h_mtx;
+ /* reduce stack usage */
+ struct iattr *ia;
+
+ zp = page_address(ZERO_PAGE(0));
+ if (unlikely(!zp))
+ return -ENOMEM; /* possible? */
+
+ err = 0;
+ all_zero = 0;
+ while (len) {
+ AuDbg("len %lld\n", len);
+ sz = blksize;
+ if (len < blksize)
+ sz = len;
+
+ rbytes = 0;
+ /* todo: signal_pending? */
+ while (!rbytes || err == -EAGAIN || err == -EINTR) {
+ rbytes = vfsub_read_k(src, buf, sz, &src->f_pos);
+ err = rbytes;
+ }
+ if (unlikely(err < 0))
+ break;
+
+ all_zero = 0;
+ if (len >= rbytes && rbytes == blksize)
+ all_zero = !memcmp(buf, zp, rbytes);
+ if (!all_zero) {
+ wbytes = rbytes;
+ p = buf;
+ while (wbytes) {
+ size_t b;
+
+ b = vfsub_write_k(dst, p, wbytes, &dst->f_pos);
+ err = b;
+ /* todo: signal_pending? */
+ if (unlikely(err == -EAGAIN || err == -EINTR))
+ continue;
+ if (unlikely(err < 0))
+ break;
+ wbytes -= b;
+ p += b;
+ }
+ } else {
+ loff_t res;
+
+ AuLabel(hole);
+ res = vfsub_llseek(dst, rbytes, SEEK_CUR);
+ err = res;
+ if (unlikely(res < 0))
+ break;
+ }
+ len -= rbytes;
+ err = 0;
+ }
+
+ /* the last block may be a hole */
+ if (!err && all_zero) {
+ AuLabel(last hole);
+
+ err = 1;
+ if (au_test_nfs(dst->f_dentry->d_sb)) {
+ /* nfs requires this step to make last hole */
+ /* is this only nfs? */
+ do {
+ /* todo: signal_pending? */
+ err = vfsub_write_k(dst, "\0", 1, &dst->f_pos);
+ } while (err == -EAGAIN || err == -EINTR);
+ if (err == 1)
+ dst->f_pos--;
+ }
+
+ if (err == 1) {
+ ia = (void *)buf;
+ ia->ia_size = dst->f_pos;
+ ia->ia_valid = ATTR_SIZE | ATTR_FILE;
+ ia->ia_file = dst;
+ h_mtx = &dst->f_dentry->d_inode->i_mutex;
+ mutex_lock_nested(h_mtx, AuLsc_I_CHILD2);
+ err = vfsub_notify_change(&dst->f_path, ia);
+ mutex_unlock(h_mtx);
+ }
+ }
+
+ return err;
+}
+
+int au_copy_file(struct file *dst, struct file *src, loff_t len)
+{
+ int err;
+ unsigned long blksize;
+ unsigned char do_kfree;
+ char *buf;
+
+ err = -ENOMEM;
+ blksize = dst->f_dentry->d_sb->s_blocksize;
+ if (!blksize || PAGE_SIZE < blksize)
+ blksize = PAGE_SIZE;
+ AuDbg("blksize %lu\n", blksize);
+ do_kfree = (blksize != PAGE_SIZE && blksize >= sizeof(struct iattr *));
+ if (do_kfree)
+ buf = kmalloc(blksize, GFP_NOFS);
+ else
+ buf = (void *)__get_free_page(GFP_NOFS);
+ if (unlikely(!buf))
+ goto out;
+
+ if (len > (1 << 22))
+ AuDbg("copying a large file %lld\n", (long long)len);
+
+ src->f_pos = 0;
+ dst->f_pos = 0;
+ err = au_do_copy_file(dst, src, len, buf, blksize);
+ if (do_kfree)
+ kfree(buf);
+ else
+ free_page((unsigned long)buf);
+
+out:
+ return err;
+}
+
+/*
+ * to support a sparse file which is opened with O_APPEND,
+ * we need to close the file.
+ */
+static int au_cp_regular(struct dentry *dentry, aufs_bindex_t bdst,
+ aufs_bindex_t bsrc, loff_t len)
+{
+ int err, i;
+ enum { SRC, DST };
+ struct {
+ aufs_bindex_t bindex;
+ unsigned int flags;
+ struct dentry *dentry;
+ struct file *file;
+ void *label, *label_file;
+ } *f, file[] = {
+ {
+ .bindex = bsrc,
+ .flags = O_RDONLY | O_NOATIME | O_LARGEFILE,
+ .file = NULL,
+ .label = &&out,
+ .label_file = &&out_src
+ },
+ {
+ .bindex = bdst,
+ .flags = O_WRONLY | O_NOATIME | O_LARGEFILE,
+ .file = NULL,
+ .label = &&out_src,
+ .label_file = &&out_dst
+ }
+ };
+ struct super_block *sb;
+
+ /* bsrc branch can be ro/rw. */
+ sb = dentry->d_sb;
+ f = file;
+ for (i = 0; i < 2; i++, f++) {
+ f->dentry = au_h_dptr(dentry, f->bindex);
+ f->file = au_h_open(dentry, f->bindex, f->flags, /*file*/NULL);
+ err = PTR_ERR(f->file);
+ if (IS_ERR(f->file))
+ goto *f->label;
+ err = -EINVAL;
+ if (unlikely(!f->file->f_op))
+ goto *f->label_file;
+ }
+
+ /* try stopping to update while we copyup */
+ IMustLock(file[SRC].dentry->d_inode);
+ err = au_copy_file(file[DST].file, file[SRC].file, len);
+
+out_dst:
+ fput(file[DST].file);
+ au_sbr_put(sb, file[DST].bindex);
+out_src:
+ fput(file[SRC].file);
+ au_sbr_put(sb, file[SRC].bindex);
+out:
+ return err;
+}
+
+static int au_do_cpup_regular(struct dentry *dentry, aufs_bindex_t bdst,
+ aufs_bindex_t bsrc, loff_t len,
+ struct inode *h_dir, struct path *h_path)
+{
+ int err, rerr;
+ loff_t l;
+
+ err = 0;
+ l = i_size_read(au_h_iptr(dentry->d_inode, bsrc));
+ if (len == -1 || l < len)
+ len = l;
+ if (len)
+ err = au_cp_regular(dentry, bdst, bsrc, len);
+ if (!err)
+ goto out; /* success */
+
+ rerr = vfsub_unlink(h_dir, h_path, /*force*/0);
+ if (rerr) {
+ AuIOErr("failed unlinking cpup-ed %.*s(%d, %d)\n",
+ AuDLNPair(h_path->dentry), err, rerr);
+ err = -EIO;
+ }
+
+out:
+ return err;
+}
+
+static int au_do_cpup_symlink(struct path *h_path, struct dentry *h_src,
+ struct inode *h_dir)
+{
+ int err, symlen;
+ mm_segment_t old_fs;
+ union {
+ char *k;
+ char __user *u;
+ } sym;
+
+ err = -ENOSYS;
+ if (unlikely(!h_src->d_inode->i_op->readlink))
+ goto out;
+
+ err = -ENOMEM;
+ sym.k = __getname_gfp(GFP_NOFS);
+ if (unlikely(!sym.k))
+ goto out;
+
+ /* unnecessary to support mmap_sem since symlink is not mmap-able */
+ old_fs = get_fs();
+ set_fs(KERNEL_DS);
+ symlen = h_src->d_inode->i_op->readlink(h_src, sym.u, PATH_MAX);
+ err = symlen;
+ set_fs(old_fs);
+
+ if (symlen > 0) {
+ sym.k[symlen] = 0;
+ err = vfsub_symlink(h_dir, h_path, sym.k);
+ }
+ __putname(sym.k);
+
+out:
+ return err;
+}
+
+/* return with the lower dst inode is locked */
+static noinline_for_stack
+int cpup_entry(struct dentry *dentry, aufs_bindex_t bdst,
+ aufs_bindex_t bsrc, loff_t len, unsigned int flags,
+ struct dentry *dst_parent)
+{
+ int err;
+ umode_t mode;
+ unsigned int mnt_flags;
+ unsigned char isdir;
+ const unsigned char do_dt = !!au_ftest_cpup(flags, DTIME);
+ struct au_dtime dt;
+ struct path h_path;
+ struct dentry *h_src, *h_dst, *h_parent;
+ struct inode *h_inode, *h_dir;
+ struct super_block *sb;
+
+ /* bsrc branch can be ro/rw. */
+ h_src = au_h_dptr(dentry, bsrc);
+ h_inode = h_src->d_inode;
+ AuDebugOn(h_inode != au_h_iptr(dentry->d_inode, bsrc));
+
+ /* try stopping to be referenced while we are creating */
+ h_dst = au_h_dptr(dentry, bdst);
+ h_parent = h_dst->d_parent; /* dir inode is locked */
+ h_dir = h_parent->d_inode;
+ IMustLock(h_dir);
+ AuDebugOn(h_parent != h_dst->d_parent);
+
+ sb = dentry->d_sb;
+ h_path.mnt = au_sbr_mnt(sb, bdst);
+ if (do_dt) {
+ h_path.dentry = h_parent;
+ au_dtime_store(&dt, dst_parent, &h_path);
+ }
+ h_path.dentry = h_dst;
+
+ isdir = 0;
+ mode = h_inode->i_mode;
+ switch (mode & S_IFMT) {
+ case S_IFREG:
+ /* try stopping to update while we are referencing */
+ IMustLock(h_inode);
+ err = vfsub_create(h_dir, &h_path, mode | S_IWUSR);
+ if (!err)
+ err = au_do_cpup_regular
+ (dentry, bdst, bsrc, len,
+ au_h_iptr(dst_parent->d_inode, bdst), &h_path);
+ break;
+ case S_IFDIR:
+ isdir = 1;
+ err = vfsub_mkdir(h_dir, &h_path, mode);
+ if (!err) {
+ /*
+ * strange behaviour from the users view,
+ * particularry setattr case
+ */
+ if (au_ibstart(dst_parent->d_inode) == bdst)
+ au_cpup_attr_nlink(dst_parent->d_inode,
+ /*force*/1);
+ au_cpup_attr_nlink(dentry->d_inode, /*force*/1);
+ }
+ break;
+ case S_IFLNK:
+ err = au_do_cpup_symlink(&h_path, h_src, h_dir);
+ break;
+ case S_IFCHR:
+ case S_IFBLK:
+ AuDebugOn(!capable(CAP_MKNOD));
+ /*FALLTHROUGH*/
+ case S_IFIFO:
+ case S_IFSOCK:
+ err = vfsub_mknod(h_dir, &h_path, mode, h_inode->i_rdev);
+ break;
+ default:
+ AuIOErr("Unknown inode type 0%o\n", mode);
+ err = -EIO;
+ }
+
+ mnt_flags = au_mntflags(sb);
+ if (!au_opt_test(mnt_flags, UDBA_NONE)
+ && !isdir
+ && au_opt_test(mnt_flags, XINO)
+ && h_inode->i_nlink == 1
+ /* todo: unnecessary? */
+ /* && dentry->d_inode->i_nlink == 1 */
+ && bdst < bsrc
+ && !au_ftest_cpup(flags, KEEPLINO))
+ au_xino_write(sb, bsrc, h_inode->i_ino, /*ino*/0);
+ /* ignore this error */
+
+ if (do_dt)
+ au_dtime_revert(&dt);
+ return err;
+}
+
+/*
+ * copyup the @dentry from @bsrc to @bdst.
+ * the caller must set the both of lower dentries.
+ * @len is for truncating when it is -1 copyup the entire file.
+ * in link/rename cases, @dst_parent may be different from the real one.
+ */
+static int au_cpup_single(struct dentry *dentry, aufs_bindex_t bdst,
+ aufs_bindex_t bsrc, loff_t len, unsigned int flags,
+ struct dentry *dst_parent)
+{
+ int err, rerr;
+ aufs_bindex_t old_ibstart;
+ unsigned char isdir, plink;
+ struct au_dtime dt;
+ struct path h_path;
+ struct dentry *h_src, *h_dst, *h_parent;
+ struct inode *dst_inode, *h_dir, *inode;
+ struct super_block *sb;
+
+ AuDebugOn(bsrc <= bdst);
+
+ sb = dentry->d_sb;
+ h_path.mnt = au_sbr_mnt(sb, bdst);
+ h_dst = au_h_dptr(dentry, bdst);
+ h_parent = h_dst->d_parent; /* dir inode is locked */
+ h_dir = h_parent->d_inode;
+ IMustLock(h_dir);
+
+ h_src = au_h_dptr(dentry, bsrc);
+ inode = dentry->d_inode;
+
+ if (!dst_parent)
+ dst_parent = dget_parent(dentry);
+ else
+ dget(dst_parent);
+
+ plink = !!au_opt_test(au_mntflags(sb), PLINK);
+ dst_inode = au_h_iptr(inode, bdst);
+ if (dst_inode) {
+ if (unlikely(!plink)) {
+ err = -EIO;
+ AuIOErr("hi%lu(i%lu) exists on b%d "
+ "but plink is disabled\n",
+ dst_inode->i_ino, inode->i_ino, bdst);
+ goto out;
+ }
+
+ if (dst_inode->i_nlink) {
+ const int do_dt = au_ftest_cpup(flags, DTIME);
+
+ h_src = au_plink_lkup(inode, bdst);
+ err = PTR_ERR(h_src);
+ if (IS_ERR(h_src))
+ goto out;
+ if (unlikely(!h_src->d_inode)) {
+ err = -EIO;
+ AuIOErr("i%lu exists on a upper branch "
+ "but not pseudo-linked\n",
+ inode->i_ino);
+ dput(h_src);
+ goto out;
+ }
+
+ if (do_dt) {
+ h_path.dentry = h_parent;
+ au_dtime_store(&dt, dst_parent, &h_path);
+ }
+ h_path.dentry = h_dst;
+ err = vfsub_link(h_src, h_dir, &h_path);
+ if (do_dt)
+ au_dtime_revert(&dt);
+ dput(h_src);
+ goto out;
+ } else
+ /* todo: cpup_wh_file? */
+ /* udba work */
+ au_update_ibrange(inode, /*do_put_zero*/1);
+ }
+
+ old_ibstart = au_ibstart(inode);
+ err = cpup_entry(dentry, bdst, bsrc, len, flags, dst_parent);
+ if (unlikely(err))
+ goto out;
+ dst_inode = h_dst->d_inode;
+ mutex_lock_nested(&dst_inode->i_mutex, AuLsc_I_CHILD2);
+
+ err = cpup_iattr(dentry, bdst, h_src);
+ isdir = S_ISDIR(dst_inode->i_mode);
+ if (!err) {
+ if (bdst < old_ibstart) {
+ if (S_ISREG(inode->i_mode)) {
+ err = au_dy_iaop(inode, bdst, dst_inode);
+ if (unlikely(err))
+ goto out_rev;
+ }
+ au_set_ibstart(inode, bdst);
+ }
+ au_set_h_iptr(inode, bdst, au_igrab(dst_inode),
+ au_hi_flags(inode, isdir));
+ mutex_unlock(&dst_inode->i_mutex);
+ if (!isdir
+ && h_src->d_inode->i_nlink > 1
+ && plink)
+ au_plink_append(inode, bdst, h_dst);
+ goto out; /* success */
+ }
+
+ /* revert */
+out_rev:
+ h_path.dentry = h_parent;
+ mutex_unlock(&dst_inode->i_mutex);
+ au_dtime_store(&dt, dst_parent, &h_path);
+ h_path.dentry = h_dst;
+ if (!isdir)
+ rerr = vfsub_unlink(h_dir, &h_path, /*force*/0);
+ else
+ rerr = vfsub_rmdir(h_dir, &h_path);
+ au_dtime_revert(&dt);
+ if (rerr) {
+ AuIOErr("failed removing broken entry(%d, %d)\n", err, rerr);
+ err = -EIO;
+ }
+
+out:
+ dput(dst_parent);
+ return err;
+}
+
+struct au_cpup_single_args {
+ int *errp;
+ struct dentry *dentry;
+ aufs_bindex_t bdst, bsrc;
+ loff_t len;
+ unsigned int flags;
+ struct dentry *dst_parent;
+};
+
+static void au_call_cpup_single(void *args)
+{
+ struct au_cpup_single_args *a = args;
+ *a->errp = au_cpup_single(a->dentry, a->bdst, a->bsrc, a->len,
+ a->flags, a->dst_parent);
+}
+
+/*
+ * prevent SIGXFSZ in copy-up.
+ * testing CAP_MKNOD is for generic fs,
+ * but CAP_FSETID is for xfs only, currently.
+ */
+static int au_cpup_sio_test(struct super_block *sb, umode_t mode)
+{
+ int do_sio;
+
+ do_sio = 0;
+ if (!au_wkq_test()
+ && (!au_sbi(sb)->si_plink_maint_pid
+ || au_plink_maint(sb, AuLock_NOPLM))) {
+ switch (mode & S_IFMT) {
+ case S_IFREG:
+ /* no condition about RLIMIT_FSIZE and the file size */
+ do_sio = 1;
+ break;
+ case S_IFCHR:
+ case S_IFBLK:
+ do_sio = !capable(CAP_MKNOD);
+ break;
+ }
+ if (!do_sio)
+ do_sio = ((mode & (S_ISUID | S_ISGID))
+ && !capable(CAP_FSETID));
+ }
+
+ return do_sio;
+}
+
+int au_sio_cpup_single(struct dentry *dentry, aufs_bindex_t bdst,
+ aufs_bindex_t bsrc, loff_t len, unsigned int flags,
+ struct dentry *dst_parent)
+{
+ int err, wkq_err;
+ struct dentry *h_dentry;
+
+ h_dentry = au_h_dptr(dentry, bsrc);
+ if (!au_cpup_sio_test(dentry->d_sb, h_dentry->d_inode->i_mode))
+ err = au_cpup_single(dentry, bdst, bsrc, len, flags,
+ dst_parent);
+ else {
+ struct au_cpup_single_args args = {
+ .errp = &err,
+ .dentry = dentry,
+ .bdst = bdst,
+ .bsrc = bsrc,
+ .len = len,
+ .flags = flags,
+ .dst_parent = dst_parent
+ };
+ wkq_err = au_wkq_wait(au_call_cpup_single, &args);
+ if (unlikely(wkq_err))
+ err = wkq_err;
+ }
+
+ return err;
+}
+
+/*
+ * copyup the @dentry from the first active lower branch to @bdst,
+ * using au_cpup_single().
+ */
+static int au_cpup_simple(struct dentry *dentry, aufs_bindex_t bdst, loff_t len,
+ unsigned int flags)
+{
+ int err;
+ aufs_bindex_t bsrc, bend;
+
+ bend = au_dbend(dentry);
+ for (bsrc = bdst + 1; bsrc <= bend; bsrc++)
+ if (au_h_dptr(dentry, bsrc))
+ break;
+
+ err = au_lkup_neg(dentry, bdst);
+ if (!err) {
+ err = au_cpup_single(dentry, bdst, bsrc, len, flags, NULL);
+ if (!err)
+ return 0; /* success */
+
+ /* revert */
+ au_set_h_dptr(dentry, bdst, NULL);
+ au_set_dbstart(dentry, bsrc);
+ }
+
+ return err;
+}
+
+struct au_cpup_simple_args {
+ int *errp;
+ struct dentry *dentry;
+ aufs_bindex_t bdst;
+ loff_t len;
+ unsigned int flags;
+};
+
+static void au_call_cpup_simple(void *args)
+{
+ struct au_cpup_simple_args *a = args;
+ *a->errp = au_cpup_simple(a->dentry, a->bdst, a->len, a->flags);
+}
+
+int au_sio_cpup_simple(struct dentry *dentry, aufs_bindex_t bdst, loff_t len,
+ unsigned int flags)
+{
+ int err, wkq_err;
+ struct dentry *parent;
+ struct inode *h_dir;
+
+ parent = dget_parent(dentry);
+ h_dir = au_h_iptr(parent->d_inode, bdst);
+ if (!au_test_h_perm_sio(h_dir, MAY_EXEC | MAY_WRITE)
+ && !au_cpup_sio_test(dentry->d_sb, dentry->d_inode->i_mode))
+ err = au_cpup_simple(dentry, bdst, len, flags);
+ else {
+ struct au_cpup_simple_args args = {
+ .errp = &err,
+ .dentry = dentry,
+ .bdst = bdst,
+ .len = len,
+ .flags = flags
+ };
+ wkq_err = au_wkq_wait(au_call_cpup_simple, &args);
+ if (unlikely(wkq_err))
+ err = wkq_err;
+ }
+
+ dput(parent);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * copyup the deleted file for writing.
+ */
+static int au_do_cpup_wh(struct dentry *dentry, aufs_bindex_t bdst,
+ struct dentry *wh_dentry, struct file *file,
+ loff_t len)
+{
+ int err;
+ aufs_bindex_t bstart;
+ struct au_dinfo *dinfo;
+ struct dentry *h_d_dst, *h_d_start;
+ struct au_hdentry *hdp;
+
+ dinfo = au_di(dentry);
+ AuRwMustWriteLock(&dinfo->di_rwsem);
+
+ bstart = dinfo->di_bstart;
+ hdp = dinfo->di_hdentry;
+ h_d_dst = hdp[0 + bdst].hd_dentry;
+ dinfo->di_bstart = bdst;
+ hdp[0 + bdst].hd_dentry = wh_dentry;
+ if (file) {
+ h_d_start = hdp[0 + bstart].hd_dentry;
+ hdp[0 + bstart].hd_dentry = au_hf_top(file)->f_dentry;
+ }
+ err = au_cpup_single(dentry, bdst, bstart, len, !AuCpup_DTIME,
+ /*h_parent*/NULL);
+ if (file) {
+ if (!err)
+ err = au_reopen_nondir(file);
+ hdp[0 + bstart].hd_dentry = h_d_start;
+ }
+ hdp[0 + bdst].hd_dentry = h_d_dst;
+ dinfo->di_bstart = bstart;
+
+ return err;
+}
+
+static int au_cpup_wh(struct dentry *dentry, aufs_bindex_t bdst, loff_t len,
+ struct file *file)
+{
+ int err;
+ struct au_dtime dt;
+ struct dentry *parent, *h_parent, *wh_dentry;
+ struct au_branch *br;
+ struct path h_path;
+
+ br = au_sbr(dentry->d_sb, bdst);
+ parent = dget_parent(dentry);
+ h_parent = au_h_dptr(parent, bdst);
+ wh_dentry = au_whtmp_lkup(h_parent, br, &dentry->d_name);
+ err = PTR_ERR(wh_dentry);
+ if (IS_ERR(wh_dentry))
+ goto out;
+
+ h_path.dentry = h_parent;
+ h_path.mnt = br->br_mnt;
+ au_dtime_store(&dt, parent, &h_path);
+ err = au_do_cpup_wh(dentry, bdst, wh_dentry, file, len);
+ if (unlikely(err))
+ goto out_wh;
+
+ dget(wh_dentry);
+ h_path.dentry = wh_dentry;
+ if (!S_ISDIR(wh_dentry->d_inode->i_mode))
+ err = vfsub_unlink(h_parent->d_inode, &h_path, /*force*/0);
+ else
+ err = vfsub_rmdir(h_parent->d_inode, &h_path);
+ if (unlikely(err)) {
+ AuIOErr("failed remove copied-up tmp file %.*s(%d)\n",
+ AuDLNPair(wh_dentry), err);
+ err = -EIO;
+ }
+ au_dtime_revert(&dt);
+ au_set_hi_wh(dentry->d_inode, bdst, wh_dentry);
+
+out_wh:
+ dput(wh_dentry);
+out:
+ dput(parent);
+ return err;
+}
+
+struct au_cpup_wh_args {
+ int *errp;
+ struct dentry *dentry;
+ aufs_bindex_t bdst;
+ loff_t len;
+ struct file *file;
+};
+
+static void au_call_cpup_wh(void *args)
+{
+ struct au_cpup_wh_args *a = args;
+ *a->errp = au_cpup_wh(a->dentry, a->bdst, a->len, a->file);
+}
+
+int au_sio_cpup_wh(struct dentry *dentry, aufs_bindex_t bdst, loff_t len,
+ struct file *file)
+{
+ int err, wkq_err;
+ struct dentry *parent, *h_orph, *h_parent, *h_dentry;
+ struct inode *dir, *h_dir, *h_tmpdir, *h_inode;
+ struct au_wbr *wbr;
+
+ parent = dget_parent(dentry);
+ dir = parent->d_inode;
+ h_orph = NULL;
+ h_parent = NULL;
+ h_dir = au_igrab(au_h_iptr(dir, bdst));
+ h_tmpdir = h_dir;
+ if (!h_dir->i_nlink) {
+ wbr = au_sbr(dentry->d_sb, bdst)->br_wbr;
+ h_orph = wbr->wbr_orph;
+
+ h_parent = dget(au_h_dptr(parent, bdst));
+ au_set_h_dptr(parent, bdst, dget(h_orph));
+ h_tmpdir = h_orph->d_inode;
+ au_set_h_iptr(dir, bdst, au_igrab(h_tmpdir), /*flags*/0);
+
+ /* this temporary unlock is safe */
+ if (file)
+ h_dentry = au_hf_top(file)->f_dentry;
+ else
+ h_dentry = au_h_dptr(dentry, au_dbstart(dentry));
+ h_inode = h_dentry->d_inode;
+ IMustLock(h_inode);
+ mutex_unlock(&h_inode->i_mutex);
+ mutex_lock_nested(&h_tmpdir->i_mutex, AuLsc_I_PARENT3);
+ mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
+ /* todo: au_h_open_pre()? */
+ }
+
+ if (!au_test_h_perm_sio(h_tmpdir, MAY_EXEC | MAY_WRITE)
+ && !au_cpup_sio_test(dentry->d_sb, dentry->d_inode->i_mode))
+ err = au_cpup_wh(dentry, bdst, len, file);
+ else {
+ struct au_cpup_wh_args args = {
+ .errp = &err,
+ .dentry = dentry,
+ .bdst = bdst,
+ .len = len,
+ .file = file
+ };
+ wkq_err = au_wkq_wait(au_call_cpup_wh, &args);
+ if (unlikely(wkq_err))
+ err = wkq_err;
+ }
+
+ if (h_orph) {
+ mutex_unlock(&h_tmpdir->i_mutex);
+ /* todo: au_h_open_post()? */
+ au_set_h_iptr(dir, bdst, au_igrab(h_dir), /*flags*/0);
+ au_set_h_dptr(parent, bdst, h_parent);
+ }
+ iput(h_dir);
+ dput(parent);
+
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * generic routine for both of copy-up and copy-down.
+ */
+/* cf. revalidate function in file.c */
+int au_cp_dirs(struct dentry *dentry, aufs_bindex_t bdst,
+ int (*cp)(struct dentry *dentry, aufs_bindex_t bdst,
+ struct dentry *h_parent, void *arg),
+ void *arg)
+{
+ int err;
+ struct au_pin pin;
+ struct dentry *d, *parent, *h_parent, *real_parent;
+
+ err = 0;
+ parent = dget_parent(dentry);
+ if (IS_ROOT(parent))
+ goto out;
+
+ au_pin_init(&pin, dentry, bdst, AuLsc_DI_PARENT2, AuLsc_I_PARENT2,
+ au_opt_udba(dentry->d_sb), AuPin_MNT_WRITE);
+
+ /* do not use au_dpage */
+ real_parent = parent;
+ while (1) {
+ dput(parent);
+ parent = dget_parent(dentry);
+ h_parent = au_h_dptr(parent, bdst);
+ if (h_parent)
+ goto out; /* success */
+
+ /* find top dir which is necessary to cpup */
+ do {
+ d = parent;
+ dput(parent);
+ parent = dget_parent(d);
+ di_read_lock_parent3(parent, !AuLock_IR);
+ h_parent = au_h_dptr(parent, bdst);
+ di_read_unlock(parent, !AuLock_IR);
+ } while (!h_parent);
+
+ if (d != real_parent)
+ di_write_lock_child3(d);
+
+ /* somebody else might create while we were sleeping */
+ if (!au_h_dptr(d, bdst) || !au_h_dptr(d, bdst)->d_inode) {
+ if (au_h_dptr(d, bdst))
+ au_update_dbstart(d);
+
+ au_pin_set_dentry(&pin, d);
+ err = au_do_pin(&pin);
+ if (!err) {
+ err = cp(d, bdst, h_parent, arg);
+ au_unpin(&pin);
+ }
+ }
+
+ if (d != real_parent)
+ di_write_unlock(d);
+ if (unlikely(err))
+ break;
+ }
+
+out:
+ dput(parent);
+ return err;
+}
+
+static int au_cpup_dir(struct dentry *dentry, aufs_bindex_t bdst,
+ struct dentry *h_parent __maybe_unused ,
+ void *arg __maybe_unused)
+{
+ return au_sio_cpup_simple(dentry, bdst, -1, AuCpup_DTIME);
+}
+
+int au_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst)
+{
+ return au_cp_dirs(dentry, bdst, au_cpup_dir, NULL);
+}
+
+int au_test_and_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst)
+{
+ int err;
+ struct dentry *parent;
+ struct inode *dir;
+
+ parent = dget_parent(dentry);
+ dir = parent->d_inode;
+ err = 0;
+ if (au_h_iptr(dir, bdst))
+ goto out;
+
+ di_read_unlock(parent, AuLock_IR);
+ di_write_lock_parent(parent);
+ /* someone else might change our inode while we were sleeping */
+ if (!au_h_iptr(dir, bdst))
+ err = au_cpup_dirs(dentry, bdst);
+ di_downgrade_lock(parent, AuLock_IR);
+
+out:
+ dput(parent);
+ return err;
+}
diff -urN a/fs/aufs/cpup.h b/fs/aufs/cpup.h
--- a/fs/aufs/cpup.h 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/cpup.h 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * copy-up/down functions
+ */
+
+#ifndef __AUFS_CPUP_H__
+#define __AUFS_CPUP_H__
+
+#ifdef __KERNEL__
+
+#include <linux/path.h>
+
+struct inode;
+struct file;
+
+void au_cpup_attr_flags(struct inode *dst, struct inode *src);
+void au_cpup_attr_timesizes(struct inode *inode);
+void au_cpup_attr_nlink(struct inode *inode, int force);
+void au_cpup_attr_changeable(struct inode *inode);
+void au_cpup_igen(struct inode *inode, struct inode *h_inode);
+void au_cpup_attr_all(struct inode *inode, int force);
+
+/* ---------------------------------------------------------------------- */
+
+/* cpup flags */
+#define AuCpup_DTIME 1 /* do dtime_store/revert */
+#define AuCpup_KEEPLINO (1 << 1) /* do not clear the lower xino,
+ for link(2) */
+#define au_ftest_cpup(flags, name) ((flags) & AuCpup_##name)
+#define au_fset_cpup(flags, name) \
+ do { (flags) |= AuCpup_##name; } while (0)
+#define au_fclr_cpup(flags, name) \
+ do { (flags) &= ~AuCpup_##name; } while (0)
+
+int au_copy_file(struct file *dst, struct file *src, loff_t len);
+int au_sio_cpup_single(struct dentry *dentry, aufs_bindex_t bdst,
+ aufs_bindex_t bsrc, loff_t len, unsigned int flags,
+ struct dentry *dst_parent);
+int au_sio_cpup_simple(struct dentry *dentry, aufs_bindex_t bdst, loff_t len,
+ unsigned int flags);
+int au_sio_cpup_wh(struct dentry *dentry, aufs_bindex_t bdst, loff_t len,
+ struct file *file);
+
+int au_cp_dirs(struct dentry *dentry, aufs_bindex_t bdst,
+ int (*cp)(struct dentry *dentry, aufs_bindex_t bdst,
+ struct dentry *h_parent, void *arg),
+ void *arg);
+int au_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst);
+int au_test_and_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst);
+
+/* ---------------------------------------------------------------------- */
+
+/* keep timestamps when copyup */
+struct au_dtime {
+ struct dentry *dt_dentry;
+ struct path dt_h_path;
+ struct timespec dt_atime, dt_mtime;
+};
+void au_dtime_store(struct au_dtime *dt, struct dentry *dentry,
+ struct path *h_path);
+void au_dtime_revert(struct au_dtime *dt);
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_CPUP_H__ */
diff -urN a/fs/aufs/dbgaufs.c b/fs/aufs/dbgaufs.c
--- a/fs/aufs/dbgaufs.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/dbgaufs.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,334 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * debugfs interface
+ */
+
+#include <linux/debugfs.h>
+#include "aufs.h"
+
+#ifndef CONFIG_SYSFS
+#error DEBUG_FS depends upon SYSFS
+#endif
+
+static struct dentry *dbgaufs;
+static const mode_t dbgaufs_mode = S_IRUSR | S_IRGRP | S_IROTH;
+
+/* 20 is max digits length of ulong 64 */
+struct dbgaufs_arg {
+ int n;
+ char a[20 * 4];
+};
+
+/*
+ * common function for all XINO files
+ */
+static int dbgaufs_xi_release(struct inode *inode __maybe_unused,
+ struct file *file)
+{
+ kfree(file->private_data);
+ return 0;
+}
+
+static int dbgaufs_xi_open(struct file *xf, struct file *file, int do_fcnt)
+{
+ int err;
+ struct kstat st;
+ struct dbgaufs_arg *p;
+
+ err = -ENOMEM;
+ p = kmalloc(sizeof(*p), GFP_NOFS);
+ if (unlikely(!p))
+ goto out;
+
+ err = 0;
+ p->n = 0;
+ file->private_data = p;
+ if (!xf)
+ goto out;
+
+ err = vfs_getattr(xf->f_vfsmnt, xf->f_dentry, &st);
+ if (!err) {
+ if (do_fcnt)
+ p->n = snprintf
+ (p->a, sizeof(p->a), "%ld, %llux%lu %lld\n",
+ (long)file_count(xf), st.blocks, st.blksize,
+ (long long)st.size);
+ else
+ p->n = snprintf(p->a, sizeof(p->a), "%llux%lu %lld\n",
+ st.blocks, st.blksize,
+ (long long)st.size);
+ AuDebugOn(p->n >= sizeof(p->a));
+ } else {
+ p->n = snprintf(p->a, sizeof(p->a), "err %d\n", err);
+ err = 0;
+ }
+
+out:
+ return err;
+
+}
+
+static ssize_t dbgaufs_xi_read(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct dbgaufs_arg *p;
+
+ p = file->private_data;
+ return simple_read_from_buffer(buf, count, ppos, p->a, p->n);
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int dbgaufs_xib_open(struct inode *inode, struct file *file)
+{
+ int err;
+ struct au_sbinfo *sbinfo;
+ struct super_block *sb;
+
+ sbinfo = inode->i_private;
+ sb = sbinfo->si_sb;
+ si_noflush_read_lock(sb);
+ err = dbgaufs_xi_open(sbinfo->si_xib, file, /*do_fcnt*/0);
+ si_read_unlock(sb);
+ return err;
+}
+
+static const struct file_operations dbgaufs_xib_fop = {
+ .owner = THIS_MODULE,
+ .open = dbgaufs_xib_open,
+ .release = dbgaufs_xi_release,
+ .read = dbgaufs_xi_read
+};
+
+/* ---------------------------------------------------------------------- */
+
+#define DbgaufsXi_PREFIX "xi"
+
+static int dbgaufs_xino_open(struct inode *inode, struct file *file)
+{
+ int err;
+ long l;
+ struct au_sbinfo *sbinfo;
+ struct super_block *sb;
+ struct file *xf;
+ struct qstr *name;
+
+ err = -ENOENT;
+ xf = NULL;
+ name = &file->f_dentry->d_name;
+ if (unlikely(name->len < sizeof(DbgaufsXi_PREFIX)
+ || memcmp(name->name, DbgaufsXi_PREFIX,
+ sizeof(DbgaufsXi_PREFIX) - 1)))
+ goto out;
+ err = kstrtol(name->name + sizeof(DbgaufsXi_PREFIX) - 1, 10, &l);
+ if (unlikely(err))
+ goto out;
+
+ sbinfo = inode->i_private;
+ sb = sbinfo->si_sb;
+ si_noflush_read_lock(sb);
+ if (l <= au_sbend(sb)) {
+ xf = au_sbr(sb, (aufs_bindex_t)l)->br_xino.xi_file;
+ err = dbgaufs_xi_open(xf, file, /*do_fcnt*/1);
+ } else
+ err = -ENOENT;
+ si_read_unlock(sb);
+
+out:
+ return err;
+}
+
+static const struct file_operations dbgaufs_xino_fop = {
+ .owner = THIS_MODULE,
+ .open = dbgaufs_xino_open,
+ .release = dbgaufs_xi_release,
+ .read = dbgaufs_xi_read
+};
+
+void dbgaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex)
+{
+ aufs_bindex_t bend;
+ struct au_branch *br;
+ struct au_xino_file *xi;
+
+ if (!au_sbi(sb)->si_dbgaufs)
+ return;
+
+ bend = au_sbend(sb);
+ for (; bindex <= bend; bindex++) {
+ br = au_sbr(sb, bindex);
+ xi = &br->br_xino;
+ if (xi->xi_dbgaufs) {
+ debugfs_remove(xi->xi_dbgaufs);
+ xi->xi_dbgaufs = NULL;
+ }
+ }
+}
+
+void dbgaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex)
+{
+ struct au_sbinfo *sbinfo;
+ struct dentry *parent;
+ struct au_branch *br;
+ struct au_xino_file *xi;
+ aufs_bindex_t bend;
+ char name[sizeof(DbgaufsXi_PREFIX) + 5]; /* "xi" bindex NULL */
+
+ sbinfo = au_sbi(sb);
+ parent = sbinfo->si_dbgaufs;
+ if (!parent)
+ return;
+
+ bend = au_sbend(sb);
+ for (; bindex <= bend; bindex++) {
+ snprintf(name, sizeof(name), DbgaufsXi_PREFIX "%d", bindex);
+ br = au_sbr(sb, bindex);
+ xi = &br->br_xino;
+ AuDebugOn(xi->xi_dbgaufs);
+ xi->xi_dbgaufs = debugfs_create_file(name, dbgaufs_mode, parent,
+ sbinfo, &dbgaufs_xino_fop);
+ /* ignore an error */
+ if (unlikely(!xi->xi_dbgaufs))
+ AuWarn1("failed %s under debugfs\n", name);
+ }
+}
+
+/* ---------------------------------------------------------------------- */
+
+#ifdef CONFIG_AUFS_EXPORT
+static int dbgaufs_xigen_open(struct inode *inode, struct file *file)
+{
+ int err;
+ struct au_sbinfo *sbinfo;
+ struct super_block *sb;
+
+ sbinfo = inode->i_private;
+ sb = sbinfo->si_sb;
+ si_noflush_read_lock(sb);
+ err = dbgaufs_xi_open(sbinfo->si_xigen, file, /*do_fcnt*/0);
+ si_read_unlock(sb);
+ return err;
+}
+
+static const struct file_operations dbgaufs_xigen_fop = {
+ .owner = THIS_MODULE,
+ .open = dbgaufs_xigen_open,
+ .release = dbgaufs_xi_release,
+ .read = dbgaufs_xi_read
+};
+
+static int dbgaufs_xigen_init(struct au_sbinfo *sbinfo)
+{
+ int err;
+
+ /*
+ * This function is a dynamic '__init' fucntion actually,
+ * so the tiny check for si_rwsem is unnecessary.
+ */
+ /* AuRwMustWriteLock(&sbinfo->si_rwsem); */
+
+ err = -EIO;
+ sbinfo->si_dbgaufs_xigen = debugfs_create_file
+ ("xigen", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo,
+ &dbgaufs_xigen_fop);
+ if (sbinfo->si_dbgaufs_xigen)
+ err = 0;
+
+ return err;
+}
+#else
+static int dbgaufs_xigen_init(struct au_sbinfo *sbinfo)
+{
+ return 0;
+}
+#endif /* CONFIG_AUFS_EXPORT */
+
+/* ---------------------------------------------------------------------- */
+
+void dbgaufs_si_fin(struct au_sbinfo *sbinfo)
+{
+ /*
+ * This function is a dynamic '__init' fucntion actually,
+ * so the tiny check for si_rwsem is unnecessary.
+ */
+ /* AuRwMustWriteLock(&sbinfo->si_rwsem); */
+
+ debugfs_remove_recursive(sbinfo->si_dbgaufs);
+ sbinfo->si_dbgaufs = NULL;
+ kobject_put(&sbinfo->si_kobj);
+}
+
+int dbgaufs_si_init(struct au_sbinfo *sbinfo)
+{
+ int err;
+ char name[SysaufsSiNameLen];
+
+ /*
+ * This function is a dynamic '__init' fucntion actually,
+ * so the tiny check for si_rwsem is unnecessary.
+ */
+ /* AuRwMustWriteLock(&sbinfo->si_rwsem); */
+
+ err = -ENOENT;
+ if (!dbgaufs) {
+ AuErr1("/debug/aufs is uninitialized\n");
+ goto out;
+ }
+
+ err = -EIO;
+ sysaufs_name(sbinfo, name);
+ sbinfo->si_dbgaufs = debugfs_create_dir(name, dbgaufs);
+ if (unlikely(!sbinfo->si_dbgaufs))
+ goto out;
+ kobject_get(&sbinfo->si_kobj);
+
+ sbinfo->si_dbgaufs_xib = debugfs_create_file
+ ("xib", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo,
+ &dbgaufs_xib_fop);
+ if (unlikely(!sbinfo->si_dbgaufs_xib))
+ goto out_dir;
+
+ err = dbgaufs_xigen_init(sbinfo);
+ if (!err)
+ goto out; /* success */
+
+out_dir:
+ dbgaufs_si_fin(sbinfo);
+out:
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+void dbgaufs_fin(void)
+{
+ debugfs_remove(dbgaufs);
+}
+
+int __init dbgaufs_init(void)
+{
+ int err;
+
+ err = -EIO;
+ dbgaufs = debugfs_create_dir(AUFS_NAME, NULL);
+ if (dbgaufs)
+ err = 0;
+ return err;
+}
diff -urN a/fs/aufs/dbgaufs.h b/fs/aufs/dbgaufs.h
--- a/fs/aufs/dbgaufs.h 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/dbgaufs.h 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * debugfs interface
+ */
+
+#ifndef __DBGAUFS_H__
+#define __DBGAUFS_H__
+
+#ifdef __KERNEL__
+
+struct super_block;
+struct au_sbinfo;
+
+#ifdef CONFIG_DEBUG_FS
+/* dbgaufs.c */
+void dbgaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex);
+void dbgaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex);
+void dbgaufs_si_fin(struct au_sbinfo *sbinfo);
+int dbgaufs_si_init(struct au_sbinfo *sbinfo);
+void dbgaufs_fin(void);
+int __init dbgaufs_init(void);
+#else
+AuStubVoid(dbgaufs_brs_del, struct super_block *sb, aufs_bindex_t bindex)
+AuStubVoid(dbgaufs_brs_add, struct super_block *sb, aufs_bindex_t bindex)
+AuStubVoid(dbgaufs_si_fin, struct au_sbinfo *sbinfo)
+AuStubInt0(dbgaufs_si_init, struct au_sbinfo *sbinfo)
+AuStubVoid(dbgaufs_fin, void)
+AuStubInt0(__init dbgaufs_init, void)
+#endif /* CONFIG_DEBUG_FS */
+
+#endif /* __KERNEL__ */
+#endif /* __DBGAUFS_H__ */
diff -urN a/fs/aufs/dcsub.c b/fs/aufs/dcsub.c
--- a/fs/aufs/dcsub.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/dcsub.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,243 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * sub-routines for dentry cache
+ */
+
+#include "aufs.h"
+
+static void au_dpage_free(struct au_dpage *dpage)
+{
+ int i;
+ struct dentry **p;
+
+ p = dpage->dentries;
+ for (i = 0; i < dpage->ndentry; i++)
+ dput(*p++);
+ free_page((unsigned long)dpage->dentries);
+}
+
+int au_dpages_init(struct au_dcsub_pages *dpages, gfp_t gfp)
+{
+ int err;
+ void *p;
+
+ err = -ENOMEM;
+ dpages->dpages = kmalloc(sizeof(*dpages->dpages), gfp);
+ if (unlikely(!dpages->dpages))
+ goto out;
+
+ p = (void *)__get_free_page(gfp);
+ if (unlikely(!p))
+ goto out_dpages;
+
+ dpages->dpages[0].ndentry = 0;
+ dpages->dpages[0].dentries = p;
+ dpages->ndpage = 1;
+ return 0; /* success */
+
+out_dpages:
+ kfree(dpages->dpages);
+out:
+ return err;
+}
+
+void au_dpages_free(struct au_dcsub_pages *dpages)
+{
+ int i;
+ struct au_dpage *p;
+
+ p = dpages->dpages;
+ for (i = 0; i < dpages->ndpage; i++)
+ au_dpage_free(p++);
+ kfree(dpages->dpages);
+}
+
+static int au_dpages_append(struct au_dcsub_pages *dpages,
+ struct dentry *dentry, gfp_t gfp)
+{
+ int err, sz;
+ struct au_dpage *dpage;
+ void *p;
+
+ dpage = dpages->dpages + dpages->ndpage - 1;
+ sz = PAGE_SIZE / sizeof(dentry);
+ if (unlikely(dpage->ndentry >= sz)) {
+ AuLabel(new dpage);
+ err = -ENOMEM;
+ sz = dpages->ndpage * sizeof(*dpages->dpages);
+ p = au_kzrealloc(dpages->dpages, sz,
+ sz + sizeof(*dpages->dpages), gfp);
+ if (unlikely(!p))
+ goto out;
+
+ dpages->dpages = p;
+ dpage = dpages->dpages + dpages->ndpage;
+ p = (void *)__get_free_page(gfp);
+ if (unlikely(!p))
+ goto out;
+
+ dpage->ndentry = 0;
+ dpage->dentries = p;
+ dpages->ndpage++;
+ }
+
+ AuDebugOn(!dentry->d_count);
+ dpage->dentries[dpage->ndentry++] = dget_dlock(dentry);
+ return 0; /* success */
+
+out:
+ return err;
+}
+
+int au_dcsub_pages(struct au_dcsub_pages *dpages, struct dentry *root,
+ au_dpages_test test, void *arg)
+{
+ int err;
+ struct dentry *this_parent;
+ struct list_head *next;
+ struct super_block *sb = root->d_sb;
+
+ err = 0;
+ write_seqlock(&rename_lock);
+ this_parent = root;
+ spin_lock(&this_parent->d_lock);
+repeat:
+ next = this_parent->d_subdirs.next;
+resume:
+ if (this_parent->d_sb == sb
+ && !IS_ROOT(this_parent)
+ && au_di(this_parent)
+ && this_parent->d_count
+ && (!test || test(this_parent, arg))) {
+ err = au_dpages_append(dpages, this_parent, GFP_ATOMIC);
+ if (unlikely(err))
+ goto out;
+ }
+
+ while (next != &this_parent->d_subdirs) {
+ struct list_head *tmp = next;
+ struct dentry *dentry = list_entry(tmp, struct dentry,
+ d_u.d_child);
+
+ next = tmp->next;
+ spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
+ if (dentry->d_count) {
+ if (!list_empty(&dentry->d_subdirs)) {
+ spin_unlock(&this_parent->d_lock);
+ spin_release(&dentry->d_lock.dep_map, 1,
+ _RET_IP_);
+ this_parent = dentry;
+ spin_acquire(&this_parent->d_lock.dep_map, 0, 1,
+ _RET_IP_);
+ goto repeat;
+ }
+ if (dentry->d_sb == sb
+ && au_di(dentry)
+ && (!test || test(dentry, arg)))
+ err = au_dpages_append(dpages, dentry,
+ GFP_ATOMIC);
+ }
+ spin_unlock(&dentry->d_lock);
+ if (unlikely(err))
+ goto out;
+ }
+
+ if (this_parent != root) {
+ struct dentry *tmp;
+ struct dentry *child;
+
+ tmp = this_parent->d_parent;
+ rcu_read_lock();
+ spin_unlock(&this_parent->d_lock);
+ child = this_parent;
+ this_parent = tmp;
+ spin_lock(&this_parent->d_lock);
+ rcu_read_unlock();
+ next = child->d_u.d_child.next;
+ goto resume;
+ }
+
+out:
+ spin_unlock(&this_parent->d_lock);
+ write_sequnlock(&rename_lock);
+ return err;
+}
+
+int au_dcsub_pages_rev(struct au_dcsub_pages *dpages, struct dentry *dentry,
+ int do_include, au_dpages_test test, void *arg)
+{
+ int err;
+
+ err = 0;
+ write_seqlock(&rename_lock);
+ spin_lock(&dentry->d_lock);
+ if (do_include
+ && dentry->d_count
+ && (!test || test(dentry, arg)))
+ err = au_dpages_append(dpages, dentry, GFP_ATOMIC);
+ spin_unlock(&dentry->d_lock);
+ if (unlikely(err))
+ goto out;
+
+ /*
+ * vfsmount_lock is unnecessary since this is a traverse in a single
+ * mount
+ */
+ while (!IS_ROOT(dentry)) {
+ dentry = dentry->d_parent; /* rename_lock is locked */
+ spin_lock(&dentry->d_lock);
+ if (dentry->d_count
+ && (!test || test(dentry, arg)))
+ err = au_dpages_append(dpages, dentry, GFP_ATOMIC);
+ spin_unlock(&dentry->d_lock);
+ if (unlikely(err))
+ break;
+ }
+
+out:
+ write_sequnlock(&rename_lock);
+ return err;
+}
+
+static inline int au_dcsub_dpages_aufs(struct dentry *dentry, void *arg)
+{
+ return au_di(dentry) && dentry->d_sb == arg;
+}
+
+int au_dcsub_pages_rev_aufs(struct au_dcsub_pages *dpages,
+ struct dentry *dentry, int do_include)
+{
+ return au_dcsub_pages_rev(dpages, dentry, do_include,
+ au_dcsub_dpages_aufs, dentry->d_sb);
+}
+
+int au_test_subdir(struct dentry *d1, struct dentry *d2)
+{
+ struct path path[2] = {
+ {
+ .dentry = d1
+ },
+ {
+ .dentry = d2
+ }
+ };
+
+ return path_is_under(path + 0, path + 1);
+}
diff -urN a/fs/aufs/dcsub.h b/fs/aufs/dcsub.h
--- a/fs/aufs/dcsub.h 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/dcsub.h 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,94 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * sub-routines for dentry cache
+ */
+
+#ifndef __AUFS_DCSUB_H__
+#define __AUFS_DCSUB_H__
+
+#ifdef __KERNEL__
+
+#include <linux/dcache.h>
+#include <linux/fs.h>
+
+struct dentry;
+
+struct au_dpage {
+ int ndentry;
+ struct dentry **dentries;
+};
+
+struct au_dcsub_pages {
+ int ndpage;
+ struct au_dpage *dpages;
+};
+
+/* ---------------------------------------------------------------------- */
+
+/* dcsub.c */
+int au_dpages_init(struct au_dcsub_pages *dpages, gfp_t gfp);
+void au_dpages_free(struct au_dcsub_pages *dpages);
+typedef int (*au_dpages_test)(struct dentry *dentry, void *arg);
+int au_dcsub_pages(struct au_dcsub_pages *dpages, struct dentry *root,
+ au_dpages_test test, void *arg);
+int au_dcsub_pages_rev(struct au_dcsub_pages *dpages, struct dentry *dentry,
+ int do_include, au_dpages_test test, void *arg);
+int au_dcsub_pages_rev_aufs(struct au_dcsub_pages *dpages,
+ struct dentry *dentry, int do_include);
+int au_test_subdir(struct dentry *d1, struct dentry *d2);
+
+/* ---------------------------------------------------------------------- */
+
+static inline int au_d_hashed_positive(struct dentry *d)
+{
+ int err;
+ struct inode *inode = d->d_inode;
+ err = 0;
+ if (unlikely(d_unhashed(d) || !inode || !inode->i_nlink))
+ err = -ENOENT;
+ return err;
+}
+
+static inline int au_d_alive(struct dentry *d)
+{
+ int err;
+ struct inode *inode;
+ err = 0;
+ if (!IS_ROOT(d))
+ err = au_d_hashed_positive(d);
+ else {
+ inode = d->d_inode;
+ if (unlikely(d_unlinked(d) || !inode || !inode->i_nlink))
+ err = -ENOENT;
+ }
+ return err;
+}
+
+static inline int au_alive_dir(struct dentry *d)
+{
+ int err;
+ err = au_d_alive(d);
+ if (unlikely(err || IS_DEADDIR(d->d_inode)))
+ err = -ENOENT;
+ return err;
+}
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_DCSUB_H__ */
diff -urN a/fs/aufs/debug.c b/fs/aufs/debug.c
--- a/fs/aufs/debug.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/debug.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,489 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * debug print functions
+ */
+
+#include <linux/vt_kern.h>
+#include "aufs.h"
+
+int aufs_debug;
+MODULE_PARM_DESC(debug, "debug print");
+module_param_named(debug, aufs_debug, int, S_IRUGO | S_IWUSR | S_IWGRP);
+
+char *au_plevel = KERN_DEBUG;
+#define dpri(fmt, ...) do { \
+ if ((au_plevel \
+ && strcmp(au_plevel, KERN_DEBUG)) \
+ || au_debug_test()) \
+ printk("%s" fmt, au_plevel, ##__VA_ARGS__); \
+} while (0)
+
+/* ---------------------------------------------------------------------- */
+
+void au_dpri_whlist(struct au_nhash *whlist)
+{
+ unsigned long ul, n;
+ struct hlist_head *head;
+ struct au_vdir_wh *tpos;
+ struct hlist_node *pos;
+
+ n = whlist->nh_num;
+ head = whlist->nh_head;
+ for (ul = 0; ul < n; ul++) {
+ hlist_for_each_entry(tpos, pos, head, wh_hash)
+ dpri("b%d, %.*s, %d\n",
+ tpos->wh_bindex,
+ tpos->wh_str.len, tpos->wh_str.name,
+ tpos->wh_str.len);
+ head++;
+ }
+}
+
+void au_dpri_vdir(struct au_vdir *vdir)
+{
+ unsigned long ul;
+ union au_vdir_deblk_p p;
+ unsigned char *o;
+
+ if (!vdir || IS_ERR(vdir)) {
+ dpri("err %ld\n", PTR_ERR(vdir));
+ return;
+ }
+
+ dpri("deblk %u, nblk %lu, deblk %p, last{%lu, %p}, ver %lu\n",
+ vdir->vd_deblk_sz, vdir->vd_nblk, vdir->vd_deblk,
+ vdir->vd_last.ul, vdir->vd_last.p.deblk, vdir->vd_version);
+ for (ul = 0; ul < vdir->vd_nblk; ul++) {
+ p.deblk = vdir->vd_deblk[ul];
+ o = p.deblk;
+ dpri("[%lu]: %p\n", ul, o);
+ }
+}
+
+static int do_pri_inode(aufs_bindex_t bindex, struct inode *inode, int hn,
+ struct dentry *wh)
+{
+ char *n = NULL;
+ int l = 0;
+
+ if (!inode || IS_ERR(inode)) {
+ dpri("i%d: err %ld\n", bindex, PTR_ERR(inode));
+ return -1;
+ }
+
+ /* the type of i_blocks depends upon CONFIG_LSF */
+ BUILD_BUG_ON(sizeof(inode->i_blocks) != sizeof(unsigned long)
+ && sizeof(inode->i_blocks) != sizeof(u64));
+ if (wh) {
+ n = (void *)wh->d_name.name;
+ l = wh->d_name.len;
+ }
+
+ dpri("i%d: %p, i%lu, %s, cnt %d, nl %u, 0%o, sz %llu, blk %llu,"
+ " hn %d, ct %lld, np %lu, st 0x%lx, f 0x%x, v %llu, g %x%s%.*s\n",
+ bindex, inode,
+ inode->i_ino, inode->i_sb ? au_sbtype(inode->i_sb) : "??",
+ atomic_read(&inode->i_count), inode->i_nlink, inode->i_mode,
+ i_size_read(inode), (unsigned long long)inode->i_blocks,
+ hn, (long long)timespec_to_ns(&inode->i_ctime) & 0x0ffff,
+ inode->i_mapping ? inode->i_mapping->nrpages : 0,
+ inode->i_state, inode->i_flags, inode->i_version,
+ inode->i_generation,
+ l ? ", wh " : "", l, n);
+ return 0;
+}
+
+void au_dpri_inode(struct inode *inode)
+{
+ struct au_iinfo *iinfo;
+ aufs_bindex_t bindex;
+ int err, hn;
+
+ err = do_pri_inode(-1, inode, -1, NULL);
+ if (err || !au_test_aufs(inode->i_sb))
+ return;
+
+ iinfo = au_ii(inode);
+ if (!iinfo)
+ return;
+ dpri("i-1: bstart %d, bend %d, gen %d\n",
+ iinfo->ii_bstart, iinfo->ii_bend, au_iigen(inode));
+ if (iinfo->ii_bstart < 0)
+ return;
+ hn = 0;
+ for (bindex = iinfo->ii_bstart; bindex <= iinfo->ii_bend; bindex++) {
+ hn = !!au_hn(iinfo->ii_hinode + bindex);
+ do_pri_inode(bindex, iinfo->ii_hinode[0 + bindex].hi_inode, hn,
+ iinfo->ii_hinode[0 + bindex].hi_whdentry);
+ }
+}
+
+void au_dpri_dalias(struct inode *inode)
+{
+ struct dentry *d;
+
+ spin_lock(&inode->i_lock);
+ list_for_each_entry(d, &inode->i_dentry, d_alias)
+ au_dpri_dentry(d);
+ spin_unlock(&inode->i_lock);
+}
+
+static int do_pri_dentry(aufs_bindex_t bindex, struct dentry *dentry)
+{
+ struct dentry *wh = NULL;
+ int hn;
+
+ if (!dentry || IS_ERR(dentry)) {
+ dpri("d%d: err %ld\n", bindex, PTR_ERR(dentry));
+ return -1;
+ }
+ /* do not call dget_parent() here */
+ /* note: access d_xxx without d_lock */
+ dpri("d%d: %.*s?/%.*s, %s, cnt %d, flags 0x%x\n",
+ bindex,
+ AuDLNPair(dentry->d_parent), AuDLNPair(dentry),
+ dentry->d_sb ? au_sbtype(dentry->d_sb) : "??",
+ dentry->d_count, dentry->d_flags);
+ hn = -1;
+ if (bindex >= 0 && dentry->d_inode && au_test_aufs(dentry->d_sb)) {
+ struct au_iinfo *iinfo = au_ii(dentry->d_inode);
+ if (iinfo) {
+ hn = !!au_hn(iinfo->ii_hinode + bindex);
+ wh = iinfo->ii_hinode[0 + bindex].hi_whdentry;
+ }
+ }
+ do_pri_inode(bindex, dentry->d_inode, hn, wh);
+ return 0;
+}
+
+void au_dpri_dentry(struct dentry *dentry)
+{
+ struct au_dinfo *dinfo;
+ aufs_bindex_t bindex;
+ int err;
+ struct au_hdentry *hdp;
+
+ err = do_pri_dentry(-1, dentry);
+ if (err || !au_test_aufs(dentry->d_sb))
+ return;
+
+ dinfo = au_di(dentry);
+ if (!dinfo)
+ return;
+ dpri("d-1: bstart %d, bend %d, bwh %d, bdiropq %d, gen %d\n",
+ dinfo->di_bstart, dinfo->di_bend,
+ dinfo->di_bwh, dinfo->di_bdiropq, au_digen(dentry));
+ if (dinfo->di_bstart < 0)
+ return;
+ hdp = dinfo->di_hdentry;
+ for (bindex = dinfo->di_bstart; bindex <= dinfo->di_bend; bindex++)
+ do_pri_dentry(bindex, hdp[0 + bindex].hd_dentry);
+}
+
+static int do_pri_file(aufs_bindex_t bindex, struct file *file)
+{
+ char a[32];
+
+ if (!file || IS_ERR(file)) {
+ dpri("f%d: err %ld\n", bindex, PTR_ERR(file));
+ return -1;
+ }
+ a[0] = 0;
+ if (bindex < 0
+ && file->f_dentry
+ && au_test_aufs(file->f_dentry->d_sb)
+ && au_fi(file))
+ snprintf(a, sizeof(a), ", gen %d, mmapped %d",
+ au_figen(file), atomic_read(&au_fi(file)->fi_mmapped));
+ dpri("f%d: mode 0x%x, flags 0%o, cnt %ld, v %llu, pos %llu%s\n",
+ bindex, file->f_mode, file->f_flags, (long)file_count(file),
+ file->f_version, file->f_pos, a);
+ if (file->f_dentry)
+ do_pri_dentry(bindex, file->f_dentry);
+ return 0;
+}
+
+void au_dpri_file(struct file *file)
+{
+ struct au_finfo *finfo;
+ struct au_fidir *fidir;
+ struct au_hfile *hfile;
+ aufs_bindex_t bindex;
+ int err;
+
+ err = do_pri_file(-1, file);
+ if (err || !file->f_dentry || !au_test_aufs(file->f_dentry->d_sb))
+ return;
+
+ finfo = au_fi(file);
+ if (!finfo)
+ return;
+ if (finfo->fi_btop < 0)
+ return;
+ fidir = finfo->fi_hdir;
+ if (!fidir)
+ do_pri_file(finfo->fi_btop, finfo->fi_htop.hf_file);
+ else
+ for (bindex = finfo->fi_btop;
+ bindex >= 0 && bindex <= fidir->fd_bbot;
+ bindex++) {
+ hfile = fidir->fd_hfile + bindex;
+ do_pri_file(bindex, hfile ? hfile->hf_file : NULL);
+ }
+}
+
+static int do_pri_br(aufs_bindex_t bindex, struct au_branch *br)
+{
+ struct vfsmount *mnt;
+ struct super_block *sb;
+
+ if (!br || IS_ERR(br))
+ goto out;
+ mnt = br->br_mnt;
+ if (!mnt || IS_ERR(mnt))
+ goto out;
+ sb = mnt->mnt_sb;
+ if (!sb || IS_ERR(sb))
+ goto out;
+
+ dpri("s%d: {perm 0x%x, id %d, cnt %d, wbr %p}, "
+ "%s, dev 0x%02x%02x, flags 0x%lx, cnt %d, active %d, "
+ "xino %d\n",
+ bindex, br->br_perm, br->br_id, atomic_read(&br->br_count),
+ br->br_wbr, au_sbtype(sb), MAJOR(sb->s_dev), MINOR(sb->s_dev),
+ sb->s_flags, sb->s_count,
+ atomic_read(&sb->s_active), !!br->br_xino.xi_file);
+ return 0;
+
+out:
+ dpri("s%d: err %ld\n", bindex, PTR_ERR(br));
+ return -1;
+}
+
+void au_dpri_sb(struct super_block *sb)
+{
+ struct au_sbinfo *sbinfo;
+ aufs_bindex_t bindex;
+ int err;
+ /* to reuduce stack size */
+ struct {
+ struct vfsmount mnt;
+ struct au_branch fake;
+ } *a;
+
+ /* this function can be called from magic sysrq */
+ a = kzalloc(sizeof(*a), GFP_ATOMIC);
+ if (unlikely(!a)) {
+ dpri("no memory\n");
+ return;
+ }
+
+ a->mnt.mnt_sb = sb;
+ a->fake.br_perm = 0;
+ a->fake.br_mnt = &a->mnt;
+ a->fake.br_xino.xi_file = NULL;
+ atomic_set(&a->fake.br_count, 0);
+ smp_mb(); /* atomic_set */
+ err = do_pri_br(-1, &a->fake);
+ kfree(a);
+ dpri("dev 0x%x\n", sb->s_dev);
+ if (err || !au_test_aufs(sb))
+ return;
+
+ sbinfo = au_sbi(sb);
+ if (!sbinfo)
+ return;
+ dpri("nw %d, gen %u, kobj %d\n",
+ atomic_read(&sbinfo->si_nowait.nw_len), sbinfo->si_generation,
+ atomic_read(&sbinfo->si_kobj.kref.refcount));
+ for (bindex = 0; bindex <= sbinfo->si_bend; bindex++)
+ do_pri_br(bindex, sbinfo->si_branch[0 + bindex]);
+}
+
+/* ---------------------------------------------------------------------- */
+
+void au_dbg_sleep_jiffy(int jiffy)
+{
+ while (jiffy)
+ jiffy = schedule_timeout_uninterruptible(jiffy);
+}
+
+void au_dbg_iattr(struct iattr *ia)
+{
+#define AuBit(name) if (ia->ia_valid & ATTR_ ## name) \
+ dpri(#name "\n")
+ AuBit(MODE);
+ AuBit(UID);
+ AuBit(GID);
+ AuBit(SIZE);
+ AuBit(ATIME);
+ AuBit(MTIME);
+ AuBit(CTIME);
+ AuBit(ATIME_SET);
+ AuBit(MTIME_SET);
+ AuBit(FORCE);
+ AuBit(ATTR_FLAG);
+ AuBit(KILL_SUID);
+ AuBit(KILL_SGID);
+ AuBit(FILE);
+ AuBit(KILL_PRIV);
+ AuBit(OPEN);
+ AuBit(TIMES_SET);
+#undef AuBit
+ dpri("ia_file %p\n", ia->ia_file);
+}
+
+/* ---------------------------------------------------------------------- */
+
+void __au_dbg_verify_dinode(struct dentry *dentry, const char *func, int line)
+{
+ struct inode *h_inode, *inode = dentry->d_inode;
+ struct dentry *h_dentry;
+ aufs_bindex_t bindex, bend, bi;
+
+ if (!inode /* || au_di(dentry)->di_lsc == AuLsc_DI_TMP */)
+ return;
+
+ bend = au_dbend(dentry);
+ bi = au_ibend(inode);
+ if (bi < bend)
+ bend = bi;
+ bindex = au_dbstart(dentry);
+ bi = au_ibstart(inode);
+ if (bi > bindex)
+ bindex = bi;
+
+ for (; bindex <= bend; bindex++) {
+ h_dentry = au_h_dptr(dentry, bindex);
+ if (!h_dentry)
+ continue;
+ h_inode = au_h_iptr(inode, bindex);
+ if (unlikely(h_inode != h_dentry->d_inode)) {
+ int old = au_debug_test();
+ if (!old)
+ au_debug(1);
+ AuDbg("b%d, %s:%d\n", bindex, func, line);
+ AuDbgDentry(dentry);
+ AuDbgInode(inode);
+ if (!old)
+ au_debug(0);
+ BUG();
+ }
+ }
+}
+
+void au_dbg_verify_dir_parent(struct dentry *dentry, unsigned int sigen)
+{
+ struct dentry *parent;
+
+ parent = dget_parent(dentry);
+ AuDebugOn(!S_ISDIR(dentry->d_inode->i_mode));
+ AuDebugOn(IS_ROOT(dentry));
+ AuDebugOn(au_digen_test(parent, sigen));
+ dput(parent);
+}
+
+void au_dbg_verify_nondir_parent(struct dentry *dentry, unsigned int sigen)
+{
+ struct dentry *parent;
+ struct inode *inode;
+
+ parent = dget_parent(dentry);
+ inode = dentry->d_inode;
+ AuDebugOn(inode && S_ISDIR(dentry->d_inode->i_mode));
+ AuDebugOn(au_digen_test(parent, sigen));
+ dput(parent);
+}
+
+void au_dbg_verify_gen(struct dentry *parent, unsigned int sigen)
+{
+ int err, i, j;
+ struct au_dcsub_pages dpages;
+ struct au_dpage *dpage;
+ struct dentry **dentries;
+
+ err = au_dpages_init(&dpages, GFP_NOFS);
+ AuDebugOn(err);
+ err = au_dcsub_pages_rev_aufs(&dpages, parent, /*do_include*/1);
+ AuDebugOn(err);
+ for (i = dpages.ndpage - 1; !err && i >= 0; i--) {
+ dpage = dpages.dpages + i;
+ dentries = dpage->dentries;
+ for (j = dpage->ndentry - 1; !err && j >= 0; j--)
+ AuDebugOn(au_digen_test(dentries[j], sigen));
+ }
+ au_dpages_free(&dpages);
+}
+
+void au_dbg_verify_kthread(void)
+{
+ if (au_wkq_test()) {
+ au_dbg_blocked();
+ /*
+ * It may be recursive, but udba=notify between two aufs mounts,
+ * where a single ro branch is shared, is not a problem.
+ */
+ /* WARN_ON(1); */
+ }
+}
+
+/* ---------------------------------------------------------------------- */
+
+void au_debug_sbinfo_init(struct au_sbinfo *sbinfo __maybe_unused)
+{
+#ifdef AuForceNoPlink
+ au_opt_clr(sbinfo->si_mntflags, PLINK);
+#endif
+#ifdef AuForceNoXino
+ au_opt_clr(sbinfo->si_mntflags, XINO);
+#endif
+#ifdef AuForceNoRefrof
+ au_opt_clr(sbinfo->si_mntflags, REFROF);
+#endif
+#ifdef AuForceHnotify
+ au_opt_set_udba(sbinfo->si_mntflags, UDBA_HNOTIFY);
+#endif
+#ifdef AuForceRd0
+ sbinfo->si_rdblk = 0;
+ sbinfo->si_rdhash = 0;
+#endif
+}
+
+int __init au_debug_init(void)
+{
+ aufs_bindex_t bindex;
+ struct au_vdir_destr destr;
+
+ bindex = -1;
+ AuDebugOn(bindex >= 0);
+
+ destr.len = -1;
+ AuDebugOn(destr.len < NAME_MAX);
+
+#ifdef CONFIG_4KSTACKS
+ pr_warning("CONFIG_4KSTACKS is defined.\n");
+#endif
+
+#ifdef AuForceNoBrs
+ sysaufs_brs = 0;
+#endif
+
+ return 0;
+}
diff -urN a/fs/aufs/debug.h b/fs/aufs/debug.h
--- a/fs/aufs/debug.h 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/debug.h 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,243 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * debug print functions
+ */
+
+#ifndef __AUFS_DEBUG_H__
+#define __AUFS_DEBUG_H__
+
+#ifdef __KERNEL__
+
+#include <asm/system.h>
+#include <linux/module.h>
+#include <linux/kallsyms.h>
+#include <linux/sysrq.h>
+
+#ifdef CONFIG_AUFS_DEBUG
+#define AuDebugOn(a) BUG_ON(a)
+
+/* module parameter */
+extern int aufs_debug;
+static inline void au_debug(int n)
+{
+ aufs_debug = n;
+ smp_mb();
+}
+
+static inline int au_debug_test(void)
+{
+ return aufs_debug;
+}
+#else
+#define AuDebugOn(a) do {} while (0)
+AuStubVoid(au_debug, int n)
+AuStubInt0(au_debug_test, void)
+#endif /* CONFIG_AUFS_DEBUG */
+
+/* ---------------------------------------------------------------------- */
+
+/* debug print */
+
+#define AuDbg(fmt, ...) do { \
+ if (au_debug_test()) \
+ pr_debug("DEBUG: " fmt, ##__VA_ARGS__); \
+} while (0)
+#define AuLabel(l) AuDbg(#l "\n")
+#define AuIOErr(fmt, ...) pr_err("I/O Error, " fmt, ##__VA_ARGS__)
+#define AuWarn1(fmt, ...) do { \
+ static unsigned char _c; \
+ if (!_c++) \
+ pr_warning(fmt, ##__VA_ARGS__); \
+} while (0)
+
+#define AuErr1(fmt, ...) do { \
+ static unsigned char _c; \
+ if (!_c++) \
+ pr_err(fmt, ##__VA_ARGS__); \
+} while (0)
+
+#define AuIOErr1(fmt, ...) do { \
+ static unsigned char _c; \
+ if (!_c++) \
+ AuIOErr(fmt, ##__VA_ARGS__); \
+} while (0)
+
+#define AuUnsupportMsg "This operation is not supported." \
+ " Please report this application to aufs-users ML."
+#define AuUnsupport(fmt, ...) do { \
+ pr_err(AuUnsupportMsg "\n" fmt, ##__VA_ARGS__); \
+ dump_stack(); \
+} while (0)
+
+#define AuTraceErr(e) do { \
+ if (unlikely((e) < 0)) \
+ AuDbg("err %d\n", (int)(e)); \
+} while (0)
+
+#define AuTraceErrPtr(p) do { \
+ if (IS_ERR(p)) \
+ AuDbg("err %ld\n", PTR_ERR(p)); \
+} while (0)
+
+/* dirty macros for debug print, use with "%.*s" and caution */
+#define AuLNPair(qstr) (qstr)->len, (qstr)->name
+#define AuDLNPair(d) AuLNPair(&(d)->d_name)
+
+/* ---------------------------------------------------------------------- */
+
+struct au_sbinfo;
+struct au_finfo;
+struct dentry;
+#ifdef CONFIG_AUFS_DEBUG
+extern char *au_plevel;
+struct au_nhash;
+void au_dpri_whlist(struct au_nhash *whlist);
+struct au_vdir;
+void au_dpri_vdir(struct au_vdir *vdir);
+struct inode;
+void au_dpri_inode(struct inode *inode);
+void au_dpri_dalias(struct inode *inode);
+void au_dpri_dentry(struct dentry *dentry);
+struct file;
+void au_dpri_file(struct file *filp);
+struct super_block;
+void au_dpri_sb(struct super_block *sb);
+
+void au_dbg_sleep_jiffy(int jiffy);
+struct iattr;
+void au_dbg_iattr(struct iattr *ia);
+
+#define au_dbg_verify_dinode(d) __au_dbg_verify_dinode(d, __func__, __LINE__)
+void __au_dbg_verify_dinode(struct dentry *dentry, const char *func, int line);
+void au_dbg_verify_dir_parent(struct dentry *dentry, unsigned int sigen);
+void au_dbg_verify_nondir_parent(struct dentry *dentry, unsigned int sigen);
+void au_dbg_verify_gen(struct dentry *parent, unsigned int sigen);
+void au_dbg_verify_kthread(void);
+
+int __init au_debug_init(void);
+void au_debug_sbinfo_init(struct au_sbinfo *sbinfo);
+#define AuDbgWhlist(w) do { \
+ AuDbg(#w "\n"); \
+ au_dpri_whlist(w); \
+} while (0)
+
+#define AuDbgVdir(v) do { \
+ AuDbg(#v "\n"); \
+ au_dpri_vdir(v); \
+} while (0)
+
+#define AuDbgInode(i) do { \
+ AuDbg(#i "\n"); \
+ au_dpri_inode(i); \
+} while (0)
+
+#define AuDbgDAlias(i) do { \
+ AuDbg(#i "\n"); \
+ au_dpri_dalias(i); \
+} while (0)
+
+#define AuDbgDentry(d) do { \
+ AuDbg(#d "\n"); \
+ au_dpri_dentry(d); \
+} while (0)
+
+#define AuDbgFile(f) do { \
+ AuDbg(#f "\n"); \
+ au_dpri_file(f); \
+} while (0)
+
+#define AuDbgSb(sb) do { \
+ AuDbg(#sb "\n"); \
+ au_dpri_sb(sb); \
+} while (0)
+
+#define AuDbgSleep(sec) do { \
+ AuDbg("sleep %d sec\n", sec); \
+ ssleep(sec); \
+} while (0)
+
+#define AuDbgSleepJiffy(jiffy) do { \
+ AuDbg("sleep %d jiffies\n", jiffy); \
+ au_dbg_sleep_jiffy(jiffy); \
+} while (0)
+
+#define AuDbgIAttr(ia) do { \
+ AuDbg("ia_valid 0x%x\n", (ia)->ia_valid); \
+ au_dbg_iattr(ia); \
+} while (0)
+
+#define AuDbgSym(addr) do { \
+ char sym[KSYM_SYMBOL_LEN]; \
+ sprint_symbol(sym, (unsigned long)addr); \
+ AuDbg("%s\n", sym); \
+} while (0)
+
+#define AuInfoSym(addr) do { \
+ char sym[KSYM_SYMBOL_LEN]; \
+ sprint_symbol(sym, (unsigned long)addr); \
+ AuInfo("%s\n", sym); \
+} while (0)
+#else
+AuStubVoid(au_dbg_verify_dinode, struct dentry *dentry)
+AuStubVoid(au_dbg_verify_dir_parent, struct dentry *dentry, unsigned int sigen)
+AuStubVoid(au_dbg_verify_nondir_parent, struct dentry *dentry,
+ unsigned int sigen)
+AuStubVoid(au_dbg_verify_gen, struct dentry *parent, unsigned int sigen)
+AuStubVoid(au_dbg_verify_kthread, void)
+AuStubInt0(__init au_debug_init, void)
+AuStubVoid(au_debug_sbinfo_init, struct au_sbinfo *sbinfo)
+
+#define AuDbgWhlist(w) do {} while (0)
+#define AuDbgVdir(v) do {} while (0)
+#define AuDbgInode(i) do {} while (0)
+#define AuDbgDAlias(i) do {} while (0)
+#define AuDbgDentry(d) do {} while (0)
+#define AuDbgFile(f) do {} while (0)
+#define AuDbgSb(sb) do {} while (0)
+#define AuDbgSleep(sec) do {} while (0)
+#define AuDbgSleepJiffy(jiffy) do {} while (0)
+#define AuDbgIAttr(ia) do {} while (0)
+#define AuDbgSym(addr) do {} while (0)
+#define AuInfoSym(addr) do {} while (0)
+#endif /* CONFIG_AUFS_DEBUG */
+
+/* ---------------------------------------------------------------------- */
+
+#ifdef CONFIG_AUFS_MAGIC_SYSRQ
+int __init au_sysrq_init(void);
+void au_sysrq_fin(void);
+
+#ifdef CONFIG_HW_CONSOLE
+#define au_dbg_blocked() do { \
+ WARN_ON(1); \
+ handle_sysrq('w'); \
+} while (0)
+#else
+AuStubVoid(au_dbg_blocked, void)
+#endif
+
+#else
+AuStubInt0(__init au_sysrq_init, void)
+AuStubVoid(au_sysrq_fin, void)
+AuStubVoid(au_dbg_blocked, void)
+#endif /* CONFIG_AUFS_MAGIC_SYSRQ */
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_DEBUG_H__ */
diff -urN a/fs/aufs/dentry.c b/fs/aufs/dentry.c
--- a/fs/aufs/dentry.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/dentry.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,1140 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * lookup and dentry operations
+ */
+
+#include <linux/namei.h>
+#include "aufs.h"
+
+static void au_h_nd(struct nameidata *h_nd, struct nameidata *nd)
+{
+ if (nd) {
+ *h_nd = *nd;
+
+ /*
+ * gave up supporting LOOKUP_CREATE/OPEN for lower fs,
+ * due to whiteout and branch permission.
+ */
+ h_nd->flags &= ~(/*LOOKUP_PARENT |*/ LOOKUP_OPEN | LOOKUP_CREATE
+ | LOOKUP_FOLLOW | LOOKUP_EXCL);
+ /* unnecessary? */
+ h_nd->intent.open.file = NULL;
+ } else
+ memset(h_nd, 0, sizeof(*h_nd));
+}
+
+struct au_lkup_one_args {
+ struct dentry **errp;
+ struct qstr *name;
+ struct dentry *h_parent;
+ struct au_branch *br;
+ struct nameidata *nd;
+};
+
+struct dentry *au_lkup_one(struct qstr *name, struct dentry *h_parent,
+ struct au_branch *br, struct nameidata *nd)
+{
+ struct dentry *h_dentry;
+ int err;
+ struct nameidata h_nd;
+
+ if (au_test_fs_null_nd(h_parent->d_sb))
+ return vfsub_lookup_one_len(name->name, h_parent, name->len);
+
+ au_h_nd(&h_nd, nd);
+ h_nd.path.dentry = h_parent;
+ h_nd.path.mnt = br->br_mnt;
+
+ err = vfsub_name_hash(name->name, &h_nd.last, name->len);
+ h_dentry = ERR_PTR(err);
+ if (!err) {
+ path_get(&h_nd.path);
+ h_dentry = vfsub_lookup_hash(&h_nd);
+ path_put(&h_nd.path);
+ }
+
+ AuTraceErrPtr(h_dentry);
+ return h_dentry;
+}
+
+static void au_call_lkup_one(void *args)
+{
+ struct au_lkup_one_args *a = args;
+ *a->errp = au_lkup_one(a->name, a->h_parent, a->br, a->nd);
+}
+
+#define AuLkup_ALLOW_NEG 1
+#define au_ftest_lkup(flags, name) ((flags) & AuLkup_##name)
+#define au_fset_lkup(flags, name) \
+ do { (flags) |= AuLkup_##name; } while (0)
+#define au_fclr_lkup(flags, name) \
+ do { (flags) &= ~AuLkup_##name; } while (0)
+
+struct au_do_lookup_args {
+ unsigned int flags;
+ mode_t type;
+ struct nameidata *nd;
+};
+
+/*
+ * returns positive/negative dentry, NULL or an error.
+ * NULL means whiteout-ed or not-found.
+ */
+static struct dentry*
+au_do_lookup(struct dentry *h_parent, struct dentry *dentry,
+ aufs_bindex_t bindex, struct qstr *wh_name,
+ struct au_do_lookup_args *args)
+{
+ struct dentry *h_dentry;
+ struct inode *h_inode, *inode;
+ struct au_branch *br;
+ int wh_found, opq;
+ unsigned char wh_able;
+ const unsigned char allow_neg = !!au_ftest_lkup(args->flags, ALLOW_NEG);
+
+ wh_found = 0;
+ br = au_sbr(dentry->d_sb, bindex);
+ wh_able = !!au_br_whable(br->br_perm);
+ if (wh_able)
+ wh_found = au_wh_test(h_parent, wh_name, br, /*try_sio*/0);
+ h_dentry = ERR_PTR(wh_found);
+ if (!wh_found)
+ goto real_lookup;
+ if (unlikely(wh_found < 0))
+ goto out;
+
+ /* We found a whiteout */
+ /* au_set_dbend(dentry, bindex); */
+ au_set_dbwh(dentry, bindex);
+ if (!allow_neg)
+ return NULL; /* success */
+
+real_lookup:
+ h_dentry = au_lkup_one(&dentry->d_name, h_parent, br, args->nd);
+ if (IS_ERR(h_dentry))
+ goto out;
+
+ h_inode = h_dentry->d_inode;
+ if (!h_inode) {
+ if (!allow_neg)
+ goto out_neg;
+ } else if (wh_found
+ || (args->type && args->type != (h_inode->i_mode & S_IFMT)))
+ goto out_neg;
+
+ if (au_dbend(dentry) <= bindex)
+ au_set_dbend(dentry, bindex);
+ if (au_dbstart(dentry) < 0 || bindex < au_dbstart(dentry))
+ au_set_dbstart(dentry, bindex);
+ au_set_h_dptr(dentry, bindex, h_dentry);
+
+ inode = dentry->d_inode;
+ if (!h_inode || !S_ISDIR(h_inode->i_mode) || !wh_able
+ || (inode && !S_ISDIR(inode->i_mode)))
+ goto out; /* success */
+
+ mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
+ opq = au_diropq_test(h_dentry, br);
+ mutex_unlock(&h_inode->i_mutex);
+ if (opq > 0)
+ au_set_dbdiropq(dentry, bindex);
+ else if (unlikely(opq < 0)) {
+ au_set_h_dptr(dentry, bindex, NULL);
+ h_dentry = ERR_PTR(opq);
+ }
+ goto out;
+
+out_neg:
+ dput(h_dentry);
+ h_dentry = NULL;
+out:
+ return h_dentry;
+}
+
+static int au_test_shwh(struct super_block *sb, const struct qstr *name)
+{
+ if (unlikely(!au_opt_test(au_mntflags(sb), SHWH)
+ && !strncmp(name->name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)))
+ return -EPERM;
+ return 0;
+}
+
+/*
+ * returns the number of lower positive dentries,
+ * otherwise an error.
+ * can be called at unlinking with @type is zero.
+ */
+int au_lkup_dentry(struct dentry *dentry, aufs_bindex_t bstart, mode_t type,
+ struct nameidata *nd)
+{
+ int npositive, err;
+ aufs_bindex_t bindex, btail, bdiropq;
+ unsigned char isdir;
+ struct qstr whname;
+ struct au_do_lookup_args args = {
+ .flags = 0,
+ .type = type,
+ .nd = nd
+ };
+ const struct qstr *name = &dentry->d_name;
+ struct dentry *parent;
+ struct inode *inode;
+
+ err = au_test_shwh(dentry->d_sb, name);
+ if (unlikely(err))
+ goto out;
+
+ err = au_wh_name_alloc(&whname, name);
+ if (unlikely(err))
+ goto out;
+
+ inode = dentry->d_inode;
+ isdir = !!(inode && S_ISDIR(inode->i_mode));
+ if (!type)
+ au_fset_lkup(args.flags, ALLOW_NEG);
+
+ npositive = 0;
+ parent = dget_parent(dentry);
+ btail = au_dbtaildir(parent);
+ for (bindex = bstart; bindex <= btail; bindex++) {
+ struct dentry *h_parent, *h_dentry;
+ struct inode *h_inode, *h_dir;
+
+ h_dentry = au_h_dptr(dentry, bindex);
+ if (h_dentry) {
+ if (h_dentry->d_inode)
+ npositive++;
+ if (type != S_IFDIR)
+ break;
+ continue;
+ }
+ h_parent = au_h_dptr(parent, bindex);
+ if (!h_parent)
+ continue;
+ h_dir = h_parent->d_inode;
+ if (!h_dir || !S_ISDIR(h_dir->i_mode))
+ continue;
+
+ mutex_lock_nested(&h_dir->i_mutex, AuLsc_I_PARENT);
+ h_dentry = au_do_lookup(h_parent, dentry, bindex, &whname,
+ &args);
+ mutex_unlock(&h_dir->i_mutex);
+ err = PTR_ERR(h_dentry);
+ if (IS_ERR(h_dentry))
+ goto out_parent;
+ au_fclr_lkup(args.flags, ALLOW_NEG);
+
+ if (au_dbwh(dentry) >= 0)
+ break;
+ if (!h_dentry)
+ continue;
+ h_inode = h_dentry->d_inode;
+ if (!h_inode)
+ continue;
+ npositive++;
+ if (!args.type)
+ args.type = h_inode->i_mode & S_IFMT;
+ if (args.type != S_IFDIR)
+ break;
+ else if (isdir) {
+ /* the type of lower may be different */
+ bdiropq = au_dbdiropq(dentry);
+ if (bdiropq >= 0 && bdiropq <= bindex)
+ break;
+ }
+ }
+
+ if (npositive) {
+ AuLabel(positive);
+ au_update_dbstart(dentry);
+ }
+ err = npositive;
+ if (unlikely(!au_opt_test(au_mntflags(dentry->d_sb), UDBA_NONE)
+ && au_dbstart(dentry) < 0)) {
+ err = -EIO;
+ AuIOErr("both of real entry and whiteout found, %.*s, err %d\n",
+ AuDLNPair(dentry), err);
+ }
+
+out_parent:
+ dput(parent);
+ kfree(whname.name);
+out:
+ return err;
+}
+
+struct dentry *au_sio_lkup_one(struct qstr *name, struct dentry *parent,
+ struct au_branch *br)
+{
+ struct dentry *dentry;
+ int wkq_err;
+
+ if (!au_test_h_perm_sio(parent->d_inode, MAY_EXEC))
+ dentry = au_lkup_one(name, parent, br, /*nd*/NULL);
+ else {
+ struct au_lkup_one_args args = {
+ .errp = &dentry,
+ .name = name,
+ .h_parent = parent,
+ .br = br,
+ .nd = NULL
+ };
+
+ wkq_err = au_wkq_wait(au_call_lkup_one, &args);
+ if (unlikely(wkq_err))
+ dentry = ERR_PTR(wkq_err);
+ }
+
+ return dentry;
+}
+
+/*
+ * lookup @dentry on @bindex which should be negative.
+ */
+int au_lkup_neg(struct dentry *dentry, aufs_bindex_t bindex)
+{
+ int err;
+ struct dentry *parent, *h_parent, *h_dentry;
+
+ parent = dget_parent(dentry);
+ h_parent = au_h_dptr(parent, bindex);
+ h_dentry = au_sio_lkup_one(&dentry->d_name, h_parent,
+ au_sbr(dentry->d_sb, bindex));
+ err = PTR_ERR(h_dentry);
+ if (IS_ERR(h_dentry))
+ goto out;
+ if (unlikely(h_dentry->d_inode)) {
+ err = -EIO;
+ AuIOErr("%.*s should be negative on b%d.\n",
+ AuDLNPair(h_dentry), bindex);
+ dput(h_dentry);
+ goto out;
+ }
+
+ err = 0;
+ if (bindex < au_dbstart(dentry))
+ au_set_dbstart(dentry, bindex);
+ if (au_dbend(dentry) < bindex)
+ au_set_dbend(dentry, bindex);
+ au_set_h_dptr(dentry, bindex, h_dentry);
+
+out:
+ dput(parent);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* subset of struct inode */
+struct au_iattr {
+ unsigned long i_ino;
+ /* unsigned int i_nlink; */
+ uid_t i_uid;
+ gid_t i_gid;
+ u64 i_version;
+/*
+ loff_t i_size;
+ blkcnt_t i_blocks;
+*/
+ umode_t i_mode;
+};
+
+static void au_iattr_save(struct au_iattr *ia, struct inode *h_inode)
+{
+ ia->i_ino = h_inode->i_ino;
+ /* ia->i_nlink = h_inode->i_nlink; */
+ ia->i_uid = h_inode->i_uid;
+ ia->i_gid = h_inode->i_gid;
+ ia->i_version = h_inode->i_version;
+/*
+ ia->i_size = h_inode->i_size;
+ ia->i_blocks = h_inode->i_blocks;
+*/
+ ia->i_mode = (h_inode->i_mode & S_IFMT);
+}
+
+static int au_iattr_test(struct au_iattr *ia, struct inode *h_inode)
+{
+ return ia->i_ino != h_inode->i_ino
+ /* || ia->i_nlink != h_inode->i_nlink */
+ || ia->i_uid != h_inode->i_uid
+ || ia->i_gid != h_inode->i_gid
+ || ia->i_version != h_inode->i_version
+/*
+ || ia->i_size != h_inode->i_size
+ || ia->i_blocks != h_inode->i_blocks
+*/
+ || ia->i_mode != (h_inode->i_mode & S_IFMT);
+}
+
+static int au_h_verify_dentry(struct dentry *h_dentry, struct dentry *h_parent,
+ struct au_branch *br)
+{
+ int err;
+ struct au_iattr ia;
+ struct inode *h_inode;
+ struct dentry *h_d;
+ struct super_block *h_sb;
+
+ err = 0;
+ memset(&ia, -1, sizeof(ia));
+ h_sb = h_dentry->d_sb;
+ h_inode = h_dentry->d_inode;
+ if (h_inode)
+ au_iattr_save(&ia, h_inode);
+ else if (au_test_nfs(h_sb) || au_test_fuse(h_sb))
+ /* nfs d_revalidate may return 0 for negative dentry */
+ /* fuse d_revalidate always return 0 for negative dentry */
+ goto out;
+
+ /* main purpose is namei.c:cached_lookup() and d_revalidate */
+ h_d = au_lkup_one(&h_dentry->d_name, h_parent, br, /*nd*/NULL);
+ err = PTR_ERR(h_d);
+ if (IS_ERR(h_d))
+ goto out;
+
+ err = 0;
+ if (unlikely(h_d != h_dentry
+ || h_d->d_inode != h_inode
+ || (h_inode && au_iattr_test(&ia, h_inode))))
+ err = au_busy_or_stale();
+ dput(h_d);
+
+out:
+ AuTraceErr(err);
+ return err;
+}
+
+int au_h_verify(struct dentry *h_dentry, unsigned int udba, struct inode *h_dir,
+ struct dentry *h_parent, struct au_branch *br)
+{
+ int err;
+
+ err = 0;
+ if (udba == AuOpt_UDBA_REVAL
+ && !au_test_fs_remote(h_dentry->d_sb)) {
+ IMustLock(h_dir);
+ err = (h_dentry->d_parent->d_inode != h_dir);
+ } else if (udba != AuOpt_UDBA_NONE)
+ err = au_h_verify_dentry(h_dentry, h_parent, br);
+
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int au_do_refresh_hdentry(struct dentry *dentry, struct dentry *parent)
+{
+ int err;
+ aufs_bindex_t new_bindex, bindex, bend, bwh, bdiropq;
+ struct au_hdentry tmp, *p, *q;
+ struct au_dinfo *dinfo;
+ struct super_block *sb;
+
+ DiMustWriteLock(dentry);
+
+ sb = dentry->d_sb;
+ dinfo = au_di(dentry);
+ bend = dinfo->di_bend;
+ bwh = dinfo->di_bwh;
+ bdiropq = dinfo->di_bdiropq;
+ p = dinfo->di_hdentry + dinfo->di_bstart;
+ for (bindex = dinfo->di_bstart; bindex <= bend; bindex++, p++) {
+ if (!p->hd_dentry)
+ continue;
+
+ new_bindex = au_br_index(sb, p->hd_id);
+ if (new_bindex == bindex)
+ continue;
+
+ if (dinfo->di_bwh == bindex)
+ bwh = new_bindex;
+ if (dinfo->di_bdiropq == bindex)
+ bdiropq = new_bindex;
+ if (new_bindex < 0) {
+ au_hdput(p);
+ p->hd_dentry = NULL;
+ continue;
+ }
+
+ /* swap two lower dentries, and loop again */
+ q = dinfo->di_hdentry + new_bindex;
+ tmp = *q;
+ *q = *p;
+ *p = tmp;
+ if (tmp.hd_dentry) {
+ bindex--;
+ p--;
+ }
+ }
+
+ dinfo->di_bwh = -1;
+ if (bwh >= 0 && bwh <= au_sbend(sb) && au_sbr_whable(sb, bwh))
+ dinfo->di_bwh = bwh;
+
+ dinfo->di_bdiropq = -1;
+ if (bdiropq >= 0
+ && bdiropq <= au_sbend(sb)
+ && au_sbr_whable(sb, bdiropq))
+ dinfo->di_bdiropq = bdiropq;
+
+ err = -EIO;
+ dinfo->di_bstart = -1;
+ dinfo->di_bend = -1;
+ bend = au_dbend(parent);
+ p = dinfo->di_hdentry;
+ for (bindex = 0; bindex <= bend; bindex++, p++)
+ if (p->hd_dentry) {
+ dinfo->di_bstart = bindex;
+ break;
+ }
+
+ if (dinfo->di_bstart >= 0) {
+ p = dinfo->di_hdentry + bend;
+ for (bindex = bend; bindex >= 0; bindex--, p--)
+ if (p->hd_dentry) {
+ dinfo->di_bend = bindex;
+ err = 0;
+ break;
+ }
+ }
+
+ return err;
+}
+
+static void au_do_hide(struct dentry *dentry)
+{
+ struct inode *inode;
+
+ inode = dentry->d_inode;
+ if (inode) {
+ if (!S_ISDIR(inode->i_mode)) {
+ if (inode->i_nlink && !d_unhashed(dentry))
+ drop_nlink(inode);
+ } else {
+ clear_nlink(inode);
+ /* stop next lookup */
+ inode->i_flags |= S_DEAD;
+ }
+ smp_mb(); /* necessary? */
+ }
+ d_drop(dentry);
+}
+
+static int au_hide_children(struct dentry *parent)
+{
+ int err, i, j, ndentry;
+ struct au_dcsub_pages dpages;
+ struct au_dpage *dpage;
+ struct dentry *dentry;
+
+ err = au_dpages_init(&dpages, GFP_NOFS);
+ if (unlikely(err))
+ goto out;
+ err = au_dcsub_pages(&dpages, parent, NULL, NULL);
+ if (unlikely(err))
+ goto out_dpages;
+
+ /* in reverse order */
+ for (i = dpages.ndpage - 1; i >= 0; i--) {
+ dpage = dpages.dpages + i;
+ ndentry = dpage->ndentry;
+ for (j = ndentry - 1; j >= 0; j--) {
+ dentry = dpage->dentries[j];
+ if (dentry != parent)
+ au_do_hide(dentry);
+ }
+ }
+
+out_dpages:
+ au_dpages_free(&dpages);
+out:
+ return err;
+}
+
+static void au_hide(struct dentry *dentry)
+{
+ int err;
+ struct inode *inode;
+
+ AuDbgDentry(dentry);
+ inode = dentry->d_inode;
+ if (inode && S_ISDIR(inode->i_mode)) {
+ /* shrink_dcache_parent(dentry); */
+ err = au_hide_children(dentry);
+ if (unlikely(err))
+ AuIOErr("%.*s, failed hiding children, ignored %d\n",
+ AuDLNPair(dentry), err);
+ }
+ au_do_hide(dentry);
+}
+
+/*
+ * By adding a dirty branch, a cached dentry may be affected in various ways.
+ *
+ * a dirty branch is added
+ * - on the top of layers
+ * - in the middle of layers
+ * - to the bottom of layers
+ *
+ * on the added branch there exists
+ * - a whiteout
+ * - a diropq
+ * - a same named entry
+ * + exist
+ * * negative --> positive
+ * * positive --> positive
+ * - type is unchanged
+ * - type is changed
+ * + doesn't exist
+ * * negative --> negative
+ * * positive --> negative (rejected by au_br_del() for non-dir case)
+ * - none
+ */
+static int au_refresh_by_dinfo(struct dentry *dentry, struct au_dinfo *dinfo,
+ struct au_dinfo *tmp)
+{
+ int err;
+ aufs_bindex_t bindex, bend;
+ struct {
+ struct dentry *dentry;
+ struct inode *inode;
+ mode_t mode;
+ } orig_h, tmp_h;
+ struct au_hdentry *hd;
+ struct inode *inode, *h_inode;
+ struct dentry *h_dentry;
+
+ err = 0;
+ AuDebugOn(dinfo->di_bstart < 0);
+ orig_h.dentry = dinfo->di_hdentry[dinfo->di_bstart].hd_dentry;
+ orig_h.inode = orig_h.dentry->d_inode;
+ orig_h.mode = 0;
+ if (orig_h.inode)
+ orig_h.mode = orig_h.inode->i_mode & S_IFMT;
+ memset(&tmp_h, 0, sizeof(tmp_h));
+ if (tmp->di_bstart >= 0) {
+ tmp_h.dentry = tmp->di_hdentry[tmp->di_bstart].hd_dentry;
+ tmp_h.inode = tmp_h.dentry->d_inode;
+ if (tmp_h.inode)
+ tmp_h.mode = tmp_h.inode->i_mode & S_IFMT;
+ }
+
+ inode = dentry->d_inode;
+ if (!orig_h.inode) {
+ AuDbg("nagative originally\n");
+ if (inode) {
+ au_hide(dentry);
+ goto out;
+ }
+ AuDebugOn(inode);
+ AuDebugOn(dinfo->di_bstart != dinfo->di_bend);
+ AuDebugOn(dinfo->di_bdiropq != -1);
+
+ if (!tmp_h.inode) {
+ AuDbg("negative --> negative\n");
+ /* should have only one negative lower */
+ if (tmp->di_bstart >= 0
+ && tmp->di_bstart < dinfo->di_bstart) {
+ AuDebugOn(tmp->di_bstart != tmp->di_bend);
+ AuDebugOn(dinfo->di_bstart != dinfo->di_bend);
+ au_set_h_dptr(dentry, dinfo->di_bstart, NULL);
+ au_di_cp(dinfo, tmp);
+ hd = tmp->di_hdentry + tmp->di_bstart;
+ au_set_h_dptr(dentry, tmp->di_bstart,
+ dget(hd->hd_dentry));
+ }
+ au_dbg_verify_dinode(dentry);
+ } else {
+ AuDbg("negative --> positive\n");
+ /*
+ * similar to the behaviour of creating with bypassing
+ * aufs.
+ * unhash it in order to force an error in the
+ * succeeding create operation.
+ * we should not set S_DEAD here.
+ */
+ d_drop(dentry);
+ /* au_di_swap(tmp, dinfo); */
+ au_dbg_verify_dinode(dentry);
+ }
+ } else {
+ AuDbg("positive originally\n");
+ /* inode may be NULL */
+ AuDebugOn(inode && (inode->i_mode & S_IFMT) != orig_h.mode);
+ if (!tmp_h.inode) {
+ AuDbg("positive --> negative\n");
+ /* or bypassing aufs */
+ au_hide(dentry);
+ if (tmp->di_bwh >= 0 && tmp->di_bwh <= dinfo->di_bstart)
+ dinfo->di_bwh = tmp->di_bwh;
+ if (inode)
+ err = au_refresh_hinode_self(inode);
+ au_dbg_verify_dinode(dentry);
+ } else if (orig_h.mode == tmp_h.mode) {
+ AuDbg("positive --> positive, same type\n");
+ if (!S_ISDIR(orig_h.mode)
+ && dinfo->di_bstart > tmp->di_bstart) {
+ /*
+ * similar to the behaviour of removing and
+ * creating.
+ */
+ au_hide(dentry);
+ if (inode)
+ err = au_refresh_hinode_self(inode);
+ au_dbg_verify_dinode(dentry);
+ } else {
+ /* fill empty slots */
+ if (dinfo->di_bstart > tmp->di_bstart)
+ dinfo->di_bstart = tmp->di_bstart;
+ if (dinfo->di_bend < tmp->di_bend)
+ dinfo->di_bend = tmp->di_bend;
+ dinfo->di_bwh = tmp->di_bwh;
+ dinfo->di_bdiropq = tmp->di_bdiropq;
+ hd = tmp->di_hdentry;
+ bend = dinfo->di_bend;
+ for (bindex = tmp->di_bstart; bindex <= bend;
+ bindex++) {
+ if (au_h_dptr(dentry, bindex))
+ continue;
+ h_dentry = hd[bindex].hd_dentry;
+ if (!h_dentry)
+ continue;
+ h_inode = h_dentry->d_inode;
+ AuDebugOn(!h_inode);
+ AuDebugOn(orig_h.mode
+ != (h_inode->i_mode
+ & S_IFMT));
+ au_set_h_dptr(dentry, bindex,
+ dget(h_dentry));
+ }
+ err = au_refresh_hinode(inode, dentry);
+ au_dbg_verify_dinode(dentry);
+ }
+ } else {
+ AuDbg("positive --> positive, different type\n");
+ /* similar to the behaviour of removing and creating */
+ au_hide(dentry);
+ if (inode)
+ err = au_refresh_hinode_self(inode);
+ au_dbg_verify_dinode(dentry);
+ }
+ }
+
+out:
+ return err;
+}
+
+int au_refresh_dentry(struct dentry *dentry, struct dentry *parent)
+{
+ int err, ebrange;
+ unsigned int sigen;
+ struct au_dinfo *dinfo, *tmp;
+ struct super_block *sb;
+ struct inode *inode;
+
+ DiMustWriteLock(dentry);
+ AuDebugOn(IS_ROOT(dentry));
+ AuDebugOn(!parent->d_inode);
+
+ sb = dentry->d_sb;
+ inode = dentry->d_inode;
+ sigen = au_sigen(sb);
+ err = au_digen_test(parent, sigen);
+ if (unlikely(err))
+ goto out;
+
+ dinfo = au_di(dentry);
+ err = au_di_realloc(dinfo, au_sbend(sb) + 1);
+ if (unlikely(err))
+ goto out;
+ ebrange = au_dbrange_test(dentry);
+ if (!ebrange)
+ ebrange = au_do_refresh_hdentry(dentry, parent);
+
+ if (d_unhashed(dentry) || ebrange) {
+ AuDebugOn(au_dbstart(dentry) < 0 && au_dbend(dentry) >= 0);
+ if (inode)
+ err = au_refresh_hinode_self(inode);
+ au_dbg_verify_dinode(dentry);
+ if (!err)
+ goto out_dgen; /* success */
+ goto out;
+ }
+
+ /* temporary dinfo */
+ AuDbgDentry(dentry);
+ err = -ENOMEM;
+ tmp = au_di_alloc(sb, AuLsc_DI_TMP);
+ if (unlikely(!tmp))
+ goto out;
+ au_di_swap(tmp, dinfo);
+ /* returns the number of positive dentries */
+ /*
+ * if current working dir is removed, it returns an error.
+ * but the dentry is legal.
+ */
+ err = au_lkup_dentry(dentry, /*bstart*/0, /*type*/0, /*nd*/NULL);
+ AuDbgDentry(dentry);
+ au_di_swap(tmp, dinfo);
+ if (err == -ENOENT)
+ err = 0;
+ if (err >= 0) {
+ /* compare/refresh by dinfo */
+ AuDbgDentry(dentry);
+ err = au_refresh_by_dinfo(dentry, dinfo, tmp);
+ au_dbg_verify_dinode(dentry);
+ AuTraceErr(err);
+ }
+ au_rw_write_unlock(&tmp->di_rwsem);
+ au_di_free(tmp);
+ if (unlikely(err))
+ goto out;
+
+out_dgen:
+ au_update_digen(dentry);
+out:
+ if (unlikely(err && !(dentry->d_flags & DCACHE_NFSFS_RENAMED))) {
+ AuIOErr("failed refreshing %.*s, %d\n",
+ AuDLNPair(dentry), err);
+ AuDbgDentry(dentry);
+ }
+ AuTraceErr(err);
+ return err;
+}
+
+static noinline_for_stack
+int au_do_h_d_reval(struct dentry *h_dentry, struct nameidata *nd,
+ struct dentry *dentry, aufs_bindex_t bindex)
+{
+ int err, valid;
+ int (*reval)(struct dentry *, struct nameidata *);
+
+ err = 0;
+ if (!(h_dentry->d_flags & DCACHE_OP_REVALIDATE))
+ goto out;
+ reval = h_dentry->d_op->d_revalidate;
+
+ AuDbg("b%d\n", bindex);
+ if (au_test_fs_null_nd(h_dentry->d_sb))
+ /* it may return tri-state */
+ valid = reval(h_dentry, NULL);
+ else {
+ struct nameidata h_nd;
+ int locked;
+ struct dentry *parent;
+
+ au_h_nd(&h_nd, nd);
+ parent = nd->path.dentry;
+ locked = (nd && nd->path.dentry != dentry);
+ if (locked)
+ di_read_lock_parent(parent, AuLock_IR);
+ BUG_ON(bindex > au_dbend(parent));
+ h_nd.path.dentry = au_h_dptr(parent, bindex);
+ BUG_ON(!h_nd.path.dentry);
+ h_nd.path.mnt = au_sbr(parent->d_sb, bindex)->br_mnt;
+ path_get(&h_nd.path);
+ valid = reval(h_dentry, &h_nd);
+ path_put(&h_nd.path);
+ if (locked)
+ di_read_unlock(parent, AuLock_IR);
+ }
+
+ if (unlikely(valid < 0))
+ err = valid;
+ else if (!valid)
+ err = -EINVAL;
+
+out:
+ AuTraceErr(err);
+ return err;
+}
+
+/* todo: remove this */
+static int h_d_revalidate(struct dentry *dentry, struct inode *inode,
+ struct nameidata *nd, int do_udba)
+{
+ int err;
+ umode_t mode, h_mode;
+ aufs_bindex_t bindex, btail, bstart, ibs, ibe;
+ unsigned char plus, unhashed, is_root, h_plus;
+ struct inode *h_inode, *h_cached_inode;
+ struct dentry *h_dentry;
+ struct qstr *name, *h_name;
+
+ err = 0;
+ plus = 0;
+ mode = 0;
+ ibs = -1;
+ ibe = -1;
+ unhashed = !!d_unhashed(dentry);
+ is_root = !!IS_ROOT(dentry);
+ name = &dentry->d_name;
+
+ /*
+ * Theoretically, REVAL test should be unnecessary in case of
+ * {FS,I}NOTIFY.
+ * But {fs,i}notify doesn't fire some necessary events,
+ * IN_ATTRIB for atime/nlink/pageio
+ * IN_DELETE for NFS dentry
+ * Let's do REVAL test too.
+ */
+ if (do_udba && inode) {
+ mode = (inode->i_mode & S_IFMT);
+ plus = (inode->i_nlink > 0);
+ ibs = au_ibstart(inode);
+ ibe = au_ibend(inode);
+ }
+
+ bstart = au_dbstart(dentry);
+ btail = bstart;
+ if (inode && S_ISDIR(inode->i_mode))
+ btail = au_dbtaildir(dentry);
+ for (bindex = bstart; bindex <= btail; bindex++) {
+ h_dentry = au_h_dptr(dentry, bindex);
+ if (!h_dentry)
+ continue;
+
+ AuDbg("b%d, %.*s\n", bindex, AuDLNPair(h_dentry));
+ spin_lock(&h_dentry->d_lock);
+ h_name = &h_dentry->d_name;
+ if (unlikely(do_udba
+ && !is_root
+ && (unhashed != !!d_unhashed(h_dentry)
+ || name->len != h_name->len
+ || memcmp(name->name, h_name->name, name->len))
+ )) {
+ AuDbg("unhash 0x%x 0x%x, %.*s %.*s\n",
+ unhashed, d_unhashed(h_dentry),
+ AuDLNPair(dentry), AuDLNPair(h_dentry));
+ spin_unlock(&h_dentry->d_lock);
+ goto err;
+ }
+ spin_unlock(&h_dentry->d_lock);
+
+ err = au_do_h_d_reval(h_dentry, nd, dentry, bindex);
+ if (unlikely(err))
+ /* do not goto err, to keep the errno */
+ break;
+
+ /* todo: plink too? */
+ if (!do_udba)
+ continue;
+
+ /* UDBA tests */
+ h_inode = h_dentry->d_inode;
+ if (unlikely(!!inode != !!h_inode))
+ goto err;
+
+ h_plus = plus;
+ h_mode = mode;
+ h_cached_inode = h_inode;
+ if (h_inode) {
+ h_mode = (h_inode->i_mode & S_IFMT);
+ h_plus = (h_inode->i_nlink > 0);
+ }
+ if (inode && ibs <= bindex && bindex <= ibe)
+ h_cached_inode = au_h_iptr(inode, bindex);
+
+ if (unlikely(plus != h_plus
+ || mode != h_mode
+ || h_cached_inode != h_inode))
+ goto err;
+ continue;
+
+ err:
+ err = -EINVAL;
+ break;
+ }
+
+ return err;
+}
+
+/* todo: consolidate with do_refresh() and au_reval_for_attr() */
+static int simple_reval_dpath(struct dentry *dentry, unsigned int sigen)
+{
+ int err;
+ struct dentry *parent;
+
+ if (!au_digen_test(dentry, sigen))
+ return 0;
+
+ parent = dget_parent(dentry);
+ di_read_lock_parent(parent, AuLock_IR);
+ AuDebugOn(au_digen_test(parent, sigen));
+ au_dbg_verify_gen(parent, sigen);
+ err = au_refresh_dentry(dentry, parent);
+ di_read_unlock(parent, AuLock_IR);
+ dput(parent);
+ AuTraceErr(err);
+ return err;
+}
+
+int au_reval_dpath(struct dentry *dentry, unsigned int sigen)
+{
+ int err;
+ struct dentry *d, *parent;
+ struct inode *inode;
+
+ if (!au_ftest_si(au_sbi(dentry->d_sb), FAILED_REFRESH_DIR))
+ return simple_reval_dpath(dentry, sigen);
+
+ /* slow loop, keep it simple and stupid */
+ /* cf: au_cpup_dirs() */
+ err = 0;
+ parent = NULL;
+ while (au_digen_test(dentry, sigen)) {
+ d = dentry;
+ while (1) {
+ dput(parent);
+ parent = dget_parent(d);
+ if (!au_digen_test(parent, sigen))
+ break;
+ d = parent;
+ }
+
+ inode = d->d_inode;
+ if (d != dentry)
+ di_write_lock_child2(d);
+
+ /* someone might update our dentry while we were sleeping */
+ if (au_digen_test(d, sigen)) {
+ /*
+ * todo: consolidate with simple_reval_dpath(),
+ * do_refresh() and au_reval_for_attr().
+ */
+ di_read_lock_parent(parent, AuLock_IR);
+ err = au_refresh_dentry(d, parent);
+ di_read_unlock(parent, AuLock_IR);
+ }
+
+ if (d != dentry)
+ di_write_unlock(d);
+ dput(parent);
+ if (unlikely(err))
+ break;
+ }
+
+ return err;
+}
+
+/*
+ * if valid returns 1, otherwise 0.
+ */
+static int aufs_d_revalidate(struct dentry *dentry, struct nameidata *nd)
+{
+ int valid, err;
+ unsigned int sigen;
+ unsigned char do_udba;
+ struct super_block *sb;
+ struct inode *inode;
+
+ /* todo: support rcu-walk? */
+ if (nd && (nd->flags & LOOKUP_RCU))
+ return -ECHILD;
+
+ valid = 0;
+ if (unlikely(!au_di(dentry)))
+ goto out;
+
+ inode = dentry->d_inode;
+ if (inode && is_bad_inode(inode))
+ goto out;
+
+ valid = 1;
+ sb = dentry->d_sb;
+ /*
+ * todo: very ugly
+ * i_mutex of parent dir may be held,
+ * but we should not return 'invalid' due to busy.
+ */
+ err = aufs_read_lock(dentry, AuLock_FLUSH | AuLock_DW | AuLock_NOPLM);
+ if (unlikely(err)) {
+ valid = err;
+ AuTraceErr(err);
+ goto out;
+ }
+ if (unlikely(au_dbrange_test(dentry))) {
+ err = -EINVAL;
+ AuTraceErr(err);
+ goto out_dgrade;
+ }
+
+ sigen = au_sigen(sb);
+ if (au_digen_test(dentry, sigen)) {
+ AuDebugOn(IS_ROOT(dentry));
+ err = au_reval_dpath(dentry, sigen);
+ if (unlikely(err)) {
+ AuTraceErr(err);
+ goto out_dgrade;
+ }
+ }
+ di_downgrade_lock(dentry, AuLock_IR);
+
+ err = -EINVAL;
+ if (inode && (IS_DEADDIR(inode) || !inode->i_nlink))
+ goto out_inval;
+
+ do_udba = !au_opt_test(au_mntflags(sb), UDBA_NONE);
+ if (do_udba && inode) {
+ aufs_bindex_t bstart = au_ibstart(inode);
+ struct inode *h_inode;
+
+ if (bstart >= 0) {
+ h_inode = au_h_iptr(inode, bstart);
+ if (h_inode && au_test_higen(inode, h_inode))
+ goto out_inval;
+ }
+ }
+
+ err = h_d_revalidate(dentry, inode, nd, do_udba);
+ if (unlikely(!err && do_udba && au_dbstart(dentry) < 0)) {
+ err = -EIO;
+ AuDbg("both of real entry and whiteout found, %.*s, err %d\n",
+ AuDLNPair(dentry), err);
+ }
+ goto out_inval;
+
+out_dgrade:
+ di_downgrade_lock(dentry, AuLock_IR);
+out_inval:
+ aufs_read_unlock(dentry, AuLock_IR);
+ AuTraceErr(err);
+ valid = !err;
+out:
+ if (!valid) {
+ AuDbg("%.*s invalid, %d\n", AuDLNPair(dentry), valid);
+ d_drop(dentry);
+ }
+ return valid;
+}
+
+static void aufs_d_release(struct dentry *dentry)
+{
+ if (au_di(dentry)) {
+ au_di_fin(dentry);
+ au_hn_di_reinit(dentry);
+ }
+}
+
+const struct dentry_operations aufs_dop = {
+ .d_revalidate = aufs_d_revalidate,
+ .d_release = aufs_d_release
+};
diff -urN a/fs/aufs/dentry.h b/fs/aufs/dentry.h
--- a/fs/aufs/dentry.h 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/dentry.h 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,237 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * lookup and dentry operations
+ */
+
+#ifndef __AUFS_DENTRY_H__
+#define __AUFS_DENTRY_H__
+
+#ifdef __KERNEL__
+
+#include <linux/dcache.h>
+#include "rwsem.h"
+
+struct au_hdentry {
+ struct dentry *hd_dentry;
+ aufs_bindex_t hd_id;
+};
+
+struct au_dinfo {
+ atomic_t di_generation;
+
+ struct au_rwsem di_rwsem;
+ aufs_bindex_t di_bstart, di_bend, di_bwh, di_bdiropq;
+ struct au_hdentry *di_hdentry;
+} ____cacheline_aligned_in_smp;
+
+/* ---------------------------------------------------------------------- */
+
+/* dentry.c */
+extern const struct dentry_operations aufs_dop;
+struct au_branch;
+struct dentry *au_lkup_one(struct qstr *name, struct dentry *h_parent,
+ struct au_branch *br, struct nameidata *nd);
+struct dentry *au_sio_lkup_one(struct qstr *name, struct dentry *parent,
+ struct au_branch *br);
+int au_h_verify(struct dentry *h_dentry, unsigned int udba, struct inode *h_dir,
+ struct dentry *h_parent, struct au_branch *br);
+
+int au_lkup_dentry(struct dentry *dentry, aufs_bindex_t bstart, mode_t type,
+ struct nameidata *nd);
+int au_lkup_neg(struct dentry *dentry, aufs_bindex_t bindex);
+int au_refresh_dentry(struct dentry *dentry, struct dentry *parent);
+int au_reval_dpath(struct dentry *dentry, unsigned int sigen);
+
+/* dinfo.c */
+void au_di_init_once(void *_di);
+struct au_dinfo *au_di_alloc(struct super_block *sb, unsigned int lsc);
+void au_di_free(struct au_dinfo *dinfo);
+void au_di_swap(struct au_dinfo *a, struct au_dinfo *b);
+void au_di_cp(struct au_dinfo *dst, struct au_dinfo *src);
+int au_di_init(struct dentry *dentry);
+void au_di_fin(struct dentry *dentry);
+int au_di_realloc(struct au_dinfo *dinfo, int nbr);
+
+void di_read_lock(struct dentry *d, int flags, unsigned int lsc);
+void di_read_unlock(struct dentry *d, int flags);
+void di_downgrade_lock(struct dentry *d, int flags);
+void di_write_lock(struct dentry *d, unsigned int lsc);
+void di_write_unlock(struct dentry *d);
+void di_write_lock2_child(struct dentry *d1, struct dentry *d2, int isdir);
+void di_write_lock2_parent(struct dentry *d1, struct dentry *d2, int isdir);
+void di_write_unlock2(struct dentry *d1, struct dentry *d2);
+
+struct dentry *au_h_dptr(struct dentry *dentry, aufs_bindex_t bindex);
+struct dentry *au_h_d_alias(struct dentry *dentry, aufs_bindex_t bindex);
+aufs_bindex_t au_dbtail(struct dentry *dentry);
+aufs_bindex_t au_dbtaildir(struct dentry *dentry);
+
+void au_set_h_dptr(struct dentry *dentry, aufs_bindex_t bindex,
+ struct dentry *h_dentry);
+int au_digen_test(struct dentry *dentry, unsigned int sigen);
+int au_dbrange_test(struct dentry *dentry);
+void au_update_digen(struct dentry *dentry);
+void au_update_dbrange(struct dentry *dentry, int do_put_zero);
+void au_update_dbstart(struct dentry *dentry);
+void au_update_dbend(struct dentry *dentry);
+int au_find_dbindex(struct dentry *dentry, struct dentry *h_dentry);
+
+/* ---------------------------------------------------------------------- */
+
+static inline struct au_dinfo *au_di(struct dentry *dentry)
+{
+ return dentry->d_fsdata;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* lock subclass for dinfo */
+enum {
+ AuLsc_DI_CHILD, /* child first */
+ AuLsc_DI_CHILD2, /* rename(2), link(2), and cpup at hnotify */
+ AuLsc_DI_CHILD3, /* copyup dirs */
+ AuLsc_DI_PARENT,
+ AuLsc_DI_PARENT2,
+ AuLsc_DI_PARENT3,
+ AuLsc_DI_TMP /* temp for replacing dinfo */
+};
+
+/*
+ * di_read_lock_child, di_write_lock_child,
+ * di_read_lock_child2, di_write_lock_child2,
+ * di_read_lock_child3, di_write_lock_child3,
+ * di_read_lock_parent, di_write_lock_parent,
+ * di_read_lock_parent2, di_write_lock_parent2,
+ * di_read_lock_parent3, di_write_lock_parent3,
+ */
+#define AuReadLockFunc(name, lsc) \
+static inline void di_read_lock_##name(struct dentry *d, int flags) \
+{ di_read_lock(d, flags, AuLsc_DI_##lsc); }
+
+#define AuWriteLockFunc(name, lsc) \
+static inline void di_write_lock_##name(struct dentry *d) \
+{ di_write_lock(d, AuLsc_DI_##lsc); }
+
+#define AuRWLockFuncs(name, lsc) \
+ AuReadLockFunc(name, lsc) \
+ AuWriteLockFunc(name, lsc)
+
+AuRWLockFuncs(child, CHILD);
+AuRWLockFuncs(child2, CHILD2);
+AuRWLockFuncs(child3, CHILD3);
+AuRWLockFuncs(parent, PARENT);
+AuRWLockFuncs(parent2, PARENT2);
+AuRWLockFuncs(parent3, PARENT3);
+
+#undef AuReadLockFunc
+#undef AuWriteLockFunc
+#undef AuRWLockFuncs
+
+#define DiMustNoWaiters(d) AuRwMustNoWaiters(&au_di(d)->di_rwsem)
+#define DiMustAnyLock(d) AuRwMustAnyLock(&au_di(d)->di_rwsem)
+#define DiMustWriteLock(d) AuRwMustWriteLock(&au_di(d)->di_rwsem)
+
+/* ---------------------------------------------------------------------- */
+
+/* todo: memory barrier? */
+static inline unsigned int au_digen(struct dentry *d)
+{
+ return atomic_read(&au_di(d)->di_generation);
+}
+
+static inline void au_h_dentry_init(struct au_hdentry *hdentry)
+{
+ hdentry->hd_dentry = NULL;
+}
+
+static inline void au_hdput(struct au_hdentry *hd)
+{
+ if (hd)
+ dput(hd->hd_dentry);
+}
+
+static inline aufs_bindex_t au_dbstart(struct dentry *dentry)
+{
+ DiMustAnyLock(dentry);
+ return au_di(dentry)->di_bstart;
+}
+
+static inline aufs_bindex_t au_dbend(struct dentry *dentry)
+{
+ DiMustAnyLock(dentry);
+ return au_di(dentry)->di_bend;
+}
+
+static inline aufs_bindex_t au_dbwh(struct dentry *dentry)
+{
+ DiMustAnyLock(dentry);
+ return au_di(dentry)->di_bwh;
+}
+
+static inline aufs_bindex_t au_dbdiropq(struct dentry *dentry)
+{
+ DiMustAnyLock(dentry);
+ return au_di(dentry)->di_bdiropq;
+}
+
+/* todo: hard/soft set? */
+static inline void au_set_dbstart(struct dentry *dentry, aufs_bindex_t bindex)
+{
+ DiMustWriteLock(dentry);
+ au_di(dentry)->di_bstart = bindex;
+}
+
+static inline void au_set_dbend(struct dentry *dentry, aufs_bindex_t bindex)
+{
+ DiMustWriteLock(dentry);
+ au_di(dentry)->di_bend = bindex;
+}
+
+static inline void au_set_dbwh(struct dentry *dentry, aufs_bindex_t bindex)
+{
+ DiMustWriteLock(dentry);
+ /* dbwh can be outside of bstart - bend range */
+ au_di(dentry)->di_bwh = bindex;
+}
+
+static inline void au_set_dbdiropq(struct dentry *dentry, aufs_bindex_t bindex)
+{
+ DiMustWriteLock(dentry);
+ au_di(dentry)->di_bdiropq = bindex;
+}
+
+/* ---------------------------------------------------------------------- */
+
+#ifdef CONFIG_AUFS_HNOTIFY
+static inline void au_digen_dec(struct dentry *d)
+{
+ atomic_dec(&au_di(d)->di_generation);
+}
+
+static inline void au_hn_di_reinit(struct dentry *dentry)
+{
+ dentry->d_fsdata = NULL;
+}
+#else
+AuStubVoid(au_hn_di_reinit, struct dentry *dentry __maybe_unused)
+#endif /* CONFIG_AUFS_HNOTIFY */
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_DENTRY_H__ */
diff -urN a/fs/aufs/dinfo.c b/fs/aufs/dinfo.c
--- a/fs/aufs/dinfo.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/dinfo.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,543 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * dentry private data
+ */
+
+#include "aufs.h"
+
+void au_di_init_once(void *_dinfo)
+{
+ struct au_dinfo *dinfo = _dinfo;
+ static struct lock_class_key aufs_di;
+
+ au_rw_init(&dinfo->di_rwsem);
+ au_rw_class(&dinfo->di_rwsem, &aufs_di);
+}
+
+struct au_dinfo *au_di_alloc(struct super_block *sb, unsigned int lsc)
+{
+ struct au_dinfo *dinfo;
+ int nbr, i;
+
+ dinfo = au_cache_alloc_dinfo();
+ if (unlikely(!dinfo))
+ goto out;
+
+ nbr = au_sbend(sb) + 1;
+ if (nbr <= 0)
+ nbr = 1;
+ dinfo->di_hdentry = kcalloc(nbr, sizeof(*dinfo->di_hdentry), GFP_NOFS);
+ if (dinfo->di_hdentry) {
+ au_rw_write_lock_nested(&dinfo->di_rwsem, lsc);
+ dinfo->di_bstart = -1;
+ dinfo->di_bend = -1;
+ dinfo->di_bwh = -1;
+ dinfo->di_bdiropq = -1;
+ for (i = 0; i < nbr; i++)
+ dinfo->di_hdentry[i].hd_id = -1;
+ goto out;
+ }
+
+ au_cache_free_dinfo(dinfo);
+ dinfo = NULL;
+
+out:
+ return dinfo;
+}
+
+void au_di_free(struct au_dinfo *dinfo)
+{
+ struct au_hdentry *p;
+ aufs_bindex_t bend, bindex;
+
+ /* dentry may not be revalidated */
+ bindex = dinfo->di_bstart;
+ if (bindex >= 0) {
+ bend = dinfo->di_bend;
+ p = dinfo->di_hdentry + bindex;
+ while (bindex++ <= bend)
+ au_hdput(p++);
+ }
+ kfree(dinfo->di_hdentry);
+ au_cache_free_dinfo(dinfo);
+}
+
+void au_di_swap(struct au_dinfo *a, struct au_dinfo *b)
+{
+ struct au_hdentry *p;
+ aufs_bindex_t bi;
+
+ AuRwMustWriteLock(&a->di_rwsem);
+ AuRwMustWriteLock(&b->di_rwsem);
+
+#define DiSwap(v, name) \
+ do { \
+ v = a->di_##name; \
+ a->di_##name = b->di_##name; \
+ b->di_##name = v; \
+ } while (0)
+
+ DiSwap(p, hdentry);
+ DiSwap(bi, bstart);
+ DiSwap(bi, bend);
+ DiSwap(bi, bwh);
+ DiSwap(bi, bdiropq);
+ /* smp_mb(); */
+
+#undef DiSwap
+}
+
+void au_di_cp(struct au_dinfo *dst, struct au_dinfo *src)
+{
+ AuRwMustWriteLock(&dst->di_rwsem);
+ AuRwMustWriteLock(&src->di_rwsem);
+
+ dst->di_bstart = src->di_bstart;
+ dst->di_bend = src->di_bend;
+ dst->di_bwh = src->di_bwh;
+ dst->di_bdiropq = src->di_bdiropq;
+ /* smp_mb(); */
+}
+
+int au_di_init(struct dentry *dentry)
+{
+ int err;
+ struct super_block *sb;
+ struct au_dinfo *dinfo;
+
+ err = 0;
+ sb = dentry->d_sb;
+ dinfo = au_di_alloc(sb, AuLsc_DI_CHILD);
+ if (dinfo) {
+ atomic_set(&dinfo->di_generation, au_sigen(sb));
+ /* smp_mb(); */ /* atomic_set */
+ dentry->d_fsdata = dinfo;
+ } else
+ err = -ENOMEM;
+
+ return err;
+}
+
+void au_di_fin(struct dentry *dentry)
+{
+ struct au_dinfo *dinfo;
+
+ dinfo = au_di(dentry);
+ AuRwDestroy(&dinfo->di_rwsem);
+ au_di_free(dinfo);
+}
+
+int au_di_realloc(struct au_dinfo *dinfo, int nbr)
+{
+ int err, sz;
+ struct au_hdentry *hdp;
+
+ AuRwMustWriteLock(&dinfo->di_rwsem);
+
+ err = -ENOMEM;
+ sz = sizeof(*hdp) * (dinfo->di_bend + 1);
+ if (!sz)
+ sz = sizeof(*hdp);
+ hdp = au_kzrealloc(dinfo->di_hdentry, sz, sizeof(*hdp) * nbr, GFP_NOFS);
+ if (hdp) {
+ dinfo->di_hdentry = hdp;
+ err = 0;
+ }
+
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static void do_ii_write_lock(struct inode *inode, unsigned int lsc)
+{
+ switch (lsc) {
+ case AuLsc_DI_CHILD:
+ ii_write_lock_child(inode);
+ break;
+ case AuLsc_DI_CHILD2:
+ ii_write_lock_child2(inode);
+ break;
+ case AuLsc_DI_CHILD3:
+ ii_write_lock_child3(inode);
+ break;
+ case AuLsc_DI_PARENT:
+ ii_write_lock_parent(inode);
+ break;
+ case AuLsc_DI_PARENT2:
+ ii_write_lock_parent2(inode);
+ break;
+ case AuLsc_DI_PARENT3:
+ ii_write_lock_parent3(inode);
+ break;
+ default:
+ BUG();
+ }
+}
+
+static void do_ii_read_lock(struct inode *inode, unsigned int lsc)
+{
+ switch (lsc) {
+ case AuLsc_DI_CHILD:
+ ii_read_lock_child(inode);
+ break;
+ case AuLsc_DI_CHILD2:
+ ii_read_lock_child2(inode);
+ break;
+ case AuLsc_DI_CHILD3:
+ ii_read_lock_child3(inode);
+ break;
+ case AuLsc_DI_PARENT:
+ ii_read_lock_parent(inode);
+ break;
+ case AuLsc_DI_PARENT2:
+ ii_read_lock_parent2(inode);
+ break;
+ case AuLsc_DI_PARENT3:
+ ii_read_lock_parent3(inode);
+ break;
+ default:
+ BUG();
+ }
+}
+
+void di_read_lock(struct dentry *d, int flags, unsigned int lsc)
+{
+ au_rw_read_lock_nested(&au_di(d)->di_rwsem, lsc);
+ if (d->d_inode) {
+ if (au_ftest_lock(flags, IW))
+ do_ii_write_lock(d->d_inode, lsc);
+ else if (au_ftest_lock(flags, IR))
+ do_ii_read_lock(d->d_inode, lsc);
+ }
+}
+
+void di_read_unlock(struct dentry *d, int flags)
+{
+ if (d->d_inode) {
+ if (au_ftest_lock(flags, IW)) {
+ au_dbg_verify_dinode(d);
+ ii_write_unlock(d->d_inode);
+ } else if (au_ftest_lock(flags, IR)) {
+ au_dbg_verify_dinode(d);
+ ii_read_unlock(d->d_inode);
+ }
+ }
+ au_rw_read_unlock(&au_di(d)->di_rwsem);
+}
+
+void di_downgrade_lock(struct dentry *d, int flags)
+{
+ if (d->d_inode && au_ftest_lock(flags, IR))
+ ii_downgrade_lock(d->d_inode);
+ au_rw_dgrade_lock(&au_di(d)->di_rwsem);
+}
+
+void di_write_lock(struct dentry *d, unsigned int lsc)
+{
+ au_rw_write_lock_nested(&au_di(d)->di_rwsem, lsc);
+ if (d->d_inode)
+ do_ii_write_lock(d->d_inode, lsc);
+}
+
+void di_write_unlock(struct dentry *d)
+{
+ au_dbg_verify_dinode(d);
+ if (d->d_inode)
+ ii_write_unlock(d->d_inode);
+ au_rw_write_unlock(&au_di(d)->di_rwsem);
+}
+
+void di_write_lock2_child(struct dentry *d1, struct dentry *d2, int isdir)
+{
+ AuDebugOn(d1 == d2
+ || d1->d_inode == d2->d_inode
+ || d1->d_sb != d2->d_sb);
+
+ if (isdir && au_test_subdir(d1, d2)) {
+ di_write_lock_child(d1);
+ di_write_lock_child2(d2);
+ } else {
+ /* there should be no races */
+ di_write_lock_child(d2);
+ di_write_lock_child2(d1);
+ }
+}
+
+void di_write_lock2_parent(struct dentry *d1, struct dentry *d2, int isdir)
+{
+ AuDebugOn(d1 == d2
+ || d1->d_inode == d2->d_inode
+ || d1->d_sb != d2->d_sb);
+
+ if (isdir && au_test_subdir(d1, d2)) {
+ di_write_lock_parent(d1);
+ di_write_lock_parent2(d2);
+ } else {
+ /* there should be no races */
+ di_write_lock_parent(d2);
+ di_write_lock_parent2(d1);
+ }
+}
+
+void di_write_unlock2(struct dentry *d1, struct dentry *d2)
+{
+ di_write_unlock(d1);
+ if (d1->d_inode == d2->d_inode)
+ au_rw_write_unlock(&au_di(d2)->di_rwsem);
+ else
+ di_write_unlock(d2);
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct dentry *au_h_dptr(struct dentry *dentry, aufs_bindex_t bindex)
+{
+ struct dentry *d;
+
+ DiMustAnyLock(dentry);
+
+ if (au_dbstart(dentry) < 0 || bindex < au_dbstart(dentry))
+ return NULL;
+ AuDebugOn(bindex < 0);
+ d = au_di(dentry)->di_hdentry[0 + bindex].hd_dentry;
+ AuDebugOn(d && d->d_count <= 0);
+ return d;
+}
+
+/*
+ * extended version of au_h_dptr().
+ * returns a hashed and positive h_dentry in bindex, NULL, or error.
+ */
+struct dentry *au_h_d_alias(struct dentry *dentry, aufs_bindex_t bindex)
+{
+ struct dentry *h_dentry;
+ struct inode *inode, *h_inode;
+
+ inode = dentry->d_inode;
+ AuDebugOn(!inode);
+
+ h_dentry = NULL;
+ if (au_dbstart(dentry) <= bindex
+ && bindex <= au_dbend(dentry))
+ h_dentry = au_h_dptr(dentry, bindex);
+ if (h_dentry && !au_d_hashed_positive(h_dentry)) {
+ dget(h_dentry);
+ goto out; /* success */
+ }
+
+ AuDebugOn(bindex < au_ibstart(inode));
+ AuDebugOn(au_ibend(inode) < bindex);
+ h_inode = au_h_iptr(inode, bindex);
+ h_dentry = d_find_alias(h_inode);
+ if (h_dentry) {
+ if (!IS_ERR(h_dentry)) {
+ if (!au_d_hashed_positive(h_dentry))
+ goto out; /* success */
+ dput(h_dentry);
+ } else
+ goto out;
+ }
+
+ if (au_opt_test(au_mntflags(dentry->d_sb), PLINK)) {
+ h_dentry = au_plink_lkup(inode, bindex);
+ AuDebugOn(!h_dentry);
+ if (!IS_ERR(h_dentry)) {
+ if (!au_d_hashed_positive(h_dentry))
+ goto out; /* success */
+ dput(h_dentry);
+ h_dentry = NULL;
+ }
+ }
+
+out:
+ AuDbgDentry(h_dentry);
+ return h_dentry;
+}
+
+aufs_bindex_t au_dbtail(struct dentry *dentry)
+{
+ aufs_bindex_t bend, bwh;
+
+ bend = au_dbend(dentry);
+ if (0 <= bend) {
+ bwh = au_dbwh(dentry);
+ if (!bwh)
+ return bwh;
+ if (0 < bwh && bwh < bend)
+ return bwh - 1;
+ }
+ return bend;
+}
+
+aufs_bindex_t au_dbtaildir(struct dentry *dentry)
+{
+ aufs_bindex_t bend, bopq;
+
+ bend = au_dbtail(dentry);
+ if (0 <= bend) {
+ bopq = au_dbdiropq(dentry);
+ if (0 <= bopq && bopq < bend)
+ bend = bopq;
+ }
+ return bend;
+}
+
+/* ---------------------------------------------------------------------- */
+
+void au_set_h_dptr(struct dentry *dentry, aufs_bindex_t bindex,
+ struct dentry *h_dentry)
+{
+ struct au_hdentry *hd = au_di(dentry)->di_hdentry + bindex;
+ struct au_branch *br;
+
+ DiMustWriteLock(dentry);
+
+ au_hdput(hd);
+ hd->hd_dentry = h_dentry;
+ if (h_dentry) {
+ br = au_sbr(dentry->d_sb, bindex);
+ hd->hd_id = br->br_id;
+ }
+}
+
+int au_dbrange_test(struct dentry *dentry)
+{
+ int err;
+ aufs_bindex_t bstart, bend;
+
+ err = 0;
+ bstart = au_dbstart(dentry);
+ bend = au_dbend(dentry);
+ if (bstart >= 0)
+ AuDebugOn(bend < 0 && bstart > bend);
+ else {
+ err = -EIO;
+ AuDebugOn(bend >= 0);
+ }
+
+ return err;
+}
+
+int au_digen_test(struct dentry *dentry, unsigned int sigen)
+{
+ int err;
+
+ err = 0;
+ if (unlikely(au_digen(dentry) != sigen
+ || au_iigen_test(dentry->d_inode, sigen)))
+ err = -EIO;
+
+ return err;
+}
+
+void au_update_digen(struct dentry *dentry)
+{
+ atomic_set(&au_di(dentry)->di_generation, au_sigen(dentry->d_sb));
+ /* smp_mb(); */ /* atomic_set */
+}
+
+void au_update_dbrange(struct dentry *dentry, int do_put_zero)
+{
+ struct au_dinfo *dinfo;
+ struct dentry *h_d;
+ struct au_hdentry *hdp;
+
+ DiMustWriteLock(dentry);
+
+ dinfo = au_di(dentry);
+ if (!dinfo || dinfo->di_bstart < 0)
+ return;
+
+ hdp = dinfo->di_hdentry;
+ if (do_put_zero) {
+ aufs_bindex_t bindex, bend;
+
+ bend = dinfo->di_bend;
+ for (bindex = dinfo->di_bstart; bindex <= bend; bindex++) {
+ h_d = hdp[0 + bindex].hd_dentry;
+ if (h_d && !h_d->d_inode)
+ au_set_h_dptr(dentry, bindex, NULL);
+ }
+ }
+
+ dinfo->di_bstart = -1;
+ while (++dinfo->di_bstart <= dinfo->di_bend)
+ if (hdp[0 + dinfo->di_bstart].hd_dentry)
+ break;
+ if (dinfo->di_bstart > dinfo->di_bend) {
+ dinfo->di_bstart = -1;
+ dinfo->di_bend = -1;
+ return;
+ }
+
+ dinfo->di_bend++;
+ while (0 <= --dinfo->di_bend)
+ if (hdp[0 + dinfo->di_bend].hd_dentry)
+ break;
+ AuDebugOn(dinfo->di_bstart > dinfo->di_bend || dinfo->di_bend < 0);
+}
+
+void au_update_dbstart(struct dentry *dentry)
+{
+ aufs_bindex_t bindex, bend;
+ struct dentry *h_dentry;
+
+ bend = au_dbend(dentry);
+ for (bindex = au_dbstart(dentry); bindex <= bend; bindex++) {
+ h_dentry = au_h_dptr(dentry, bindex);
+ if (!h_dentry)
+ continue;
+ if (h_dentry->d_inode) {
+ au_set_dbstart(dentry, bindex);
+ return;
+ }
+ au_set_h_dptr(dentry, bindex, NULL);
+ }
+}
+
+void au_update_dbend(struct dentry *dentry)
+{
+ aufs_bindex_t bindex, bstart;
+ struct dentry *h_dentry;
+
+ bstart = au_dbstart(dentry);
+ for (bindex = au_dbend(dentry); bindex >= bstart; bindex--) {
+ h_dentry = au_h_dptr(dentry, bindex);
+ if (!h_dentry)
+ continue;
+ if (h_dentry->d_inode) {
+ au_set_dbend(dentry, bindex);
+ return;
+ }
+ au_set_h_dptr(dentry, bindex, NULL);
+ }
+}
+
+int au_find_dbindex(struct dentry *dentry, struct dentry *h_dentry)
+{
+ aufs_bindex_t bindex, bend;
+
+ bend = au_dbend(dentry);
+ for (bindex = au_dbstart(dentry); bindex <= bend; bindex++)
+ if (au_h_dptr(dentry, bindex) == h_dentry)
+ return bindex;
+ return -1;
+}
diff -urN a/fs/aufs/dir.c b/fs/aufs/dir.c
--- a/fs/aufs/dir.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/dir.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,634 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * directory operations
+ */
+
+#include <linux/fs_stack.h>
+#include "aufs.h"
+
+void au_add_nlink(struct inode *dir, struct inode *h_dir)
+{
+ unsigned int nlink;
+
+ AuDebugOn(!S_ISDIR(dir->i_mode) || !S_ISDIR(h_dir->i_mode));
+
+ nlink = dir->i_nlink;
+ nlink += h_dir->i_nlink - 2;
+ if (h_dir->i_nlink < 2)
+ nlink += 2;
+ set_nlink(dir, nlink);
+}
+
+void au_sub_nlink(struct inode *dir, struct inode *h_dir)
+{
+ unsigned int nlink;
+
+ AuDebugOn(!S_ISDIR(dir->i_mode) || !S_ISDIR(h_dir->i_mode));
+
+ nlink = dir->i_nlink;
+ nlink -= h_dir->i_nlink - 2;
+ if (h_dir->i_nlink < 2)
+ nlink -= 2;
+ set_nlink(dir, nlink);
+}
+
+loff_t au_dir_size(struct file *file, struct dentry *dentry)
+{
+ loff_t sz;
+ aufs_bindex_t bindex, bend;
+ struct file *h_file;
+ struct dentry *h_dentry;
+
+ sz = 0;
+ if (file) {
+ AuDebugOn(!file->f_dentry);
+ AuDebugOn(!file->f_dentry->d_inode);
+ AuDebugOn(!S_ISDIR(file->f_dentry->d_inode->i_mode));
+
+ bend = au_fbend_dir(file);
+ for (bindex = au_fbstart(file);
+ bindex <= bend && sz < KMALLOC_MAX_SIZE;
+ bindex++) {
+ h_file = au_hf_dir(file, bindex);
+ if (h_file
+ && h_file->f_dentry
+ && h_file->f_dentry->d_inode)
+ sz += i_size_read(h_file->f_dentry->d_inode);
+ }
+ } else {
+ AuDebugOn(!dentry);
+ AuDebugOn(!dentry->d_inode);
+ AuDebugOn(!S_ISDIR(dentry->d_inode->i_mode));
+
+ bend = au_dbtaildir(dentry);
+ for (bindex = au_dbstart(dentry);
+ bindex <= bend && sz < KMALLOC_MAX_SIZE;
+ bindex++) {
+ h_dentry = au_h_dptr(dentry, bindex);
+ if (h_dentry && h_dentry->d_inode)
+ sz += i_size_read(h_dentry->d_inode);
+ }
+ }
+ if (sz < KMALLOC_MAX_SIZE)
+ sz = roundup_pow_of_two(sz);
+ if (sz > KMALLOC_MAX_SIZE)
+ sz = KMALLOC_MAX_SIZE;
+ else if (sz < NAME_MAX) {
+ BUILD_BUG_ON(AUFS_RDBLK_DEF < NAME_MAX);
+ sz = AUFS_RDBLK_DEF;
+ }
+ return sz;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int reopen_dir(struct file *file)
+{
+ int err;
+ unsigned int flags;
+ aufs_bindex_t bindex, btail, bstart;
+ struct dentry *dentry, *h_dentry;
+ struct file *h_file;
+
+ /* open all lower dirs */
+ dentry = file->f_dentry;
+ bstart = au_dbstart(dentry);
+ for (bindex = au_fbstart(file); bindex < bstart; bindex++)
+ au_set_h_fptr(file, bindex, NULL);
+ au_set_fbstart(file, bstart);
+
+ btail = au_dbtaildir(dentry);
+ for (bindex = au_fbend_dir(file); btail < bindex; bindex--)
+ au_set_h_fptr(file, bindex, NULL);
+ au_set_fbend_dir(file, btail);
+
+ flags = vfsub_file_flags(file);
+ for (bindex = bstart; bindex <= btail; bindex++) {
+ h_dentry = au_h_dptr(dentry, bindex);
+ if (!h_dentry)
+ continue;
+ h_file = au_hf_dir(file, bindex);
+ if (h_file)
+ continue;
+
+ h_file = au_h_open(dentry, bindex, flags, file);
+ err = PTR_ERR(h_file);
+ if (IS_ERR(h_file))
+ goto out; /* close all? */
+ au_set_h_fptr(file, bindex, h_file);
+ }
+ au_update_figen(file);
+ /* todo: necessary? */
+ /* file->f_ra = h_file->f_ra; */
+ err = 0;
+
+out:
+ return err;
+}
+
+static int do_open_dir(struct file *file, int flags)
+{
+ int err;
+ aufs_bindex_t bindex, btail;
+ struct dentry *dentry, *h_dentry;
+ struct file *h_file;
+
+ FiMustWriteLock(file);
+
+ dentry = file->f_dentry;
+ err = au_alive_dir(dentry);
+ if (unlikely(err))
+ goto out;
+
+ file->f_version = dentry->d_inode->i_version;
+ bindex = au_dbstart(dentry);
+ au_set_fbstart(file, bindex);
+ btail = au_dbtaildir(dentry);
+ au_set_fbend_dir(file, btail);
+ for (; !err && bindex <= btail; bindex++) {
+ h_dentry = au_h_dptr(dentry, bindex);
+ if (!h_dentry)
+ continue;
+
+ h_file = au_h_open(dentry, bindex, flags, file);
+ if (IS_ERR(h_file)) {
+ err = PTR_ERR(h_file);
+ break;
+ }
+ au_set_h_fptr(file, bindex, h_file);
+ }
+ au_update_figen(file);
+ /* todo: necessary? */
+ /* file->f_ra = h_file->f_ra; */
+ if (!err)
+ return 0; /* success */
+
+ /* close all */
+ for (bindex = au_fbstart(file); bindex <= btail; bindex++)
+ au_set_h_fptr(file, bindex, NULL);
+ au_set_fbstart(file, -1);
+ au_set_fbend_dir(file, -1);
+
+out:
+ return err;
+}
+
+static int aufs_open_dir(struct inode *inode __maybe_unused,
+ struct file *file)
+{
+ int err;
+ struct super_block *sb;
+ struct au_fidir *fidir;
+
+ err = -ENOMEM;
+ sb = file->f_dentry->d_sb;
+ si_read_lock(sb, AuLock_FLUSH);
+ fidir = au_fidir_alloc(sb);
+ if (fidir) {
+ err = au_do_open(file, do_open_dir, fidir);
+ if (unlikely(err))
+ kfree(fidir);
+ }
+ si_read_unlock(sb);
+ return err;
+}
+
+static int aufs_release_dir(struct inode *inode __maybe_unused,
+ struct file *file)
+{
+ struct au_vdir *vdir_cache;
+ struct au_finfo *finfo;
+ struct au_fidir *fidir;
+ aufs_bindex_t bindex, bend;
+
+ finfo = au_fi(file);
+ fidir = finfo->fi_hdir;
+ if (fidir) {
+ /* remove me from sb->s_files */
+ file_sb_list_del(file);
+
+ vdir_cache = fidir->fd_vdir_cache; /* lock-free */
+ if (vdir_cache)
+ au_vdir_free(vdir_cache);
+
+ bindex = finfo->fi_btop;
+ if (bindex >= 0) {
+ /*
+ * calls fput() instead of filp_close(),
+ * since no dnotify or lock for the lower file.
+ */
+ bend = fidir->fd_bbot;
+ for (; bindex <= bend; bindex++)
+ au_set_h_fptr(file, bindex, NULL);
+ }
+ kfree(fidir);
+ finfo->fi_hdir = NULL;
+ }
+ au_finfo_fin(file);
+ return 0;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int au_do_flush_dir(struct file *file, fl_owner_t id)
+{
+ int err;
+ aufs_bindex_t bindex, bend;
+ struct file *h_file;
+
+ err = 0;
+ bend = au_fbend_dir(file);
+ for (bindex = au_fbstart(file); !err && bindex <= bend; bindex++) {
+ h_file = au_hf_dir(file, bindex);
+ if (h_file)
+ err = vfsub_flush(h_file, id);
+ }
+ return err;
+}
+
+static int aufs_flush_dir(struct file *file, fl_owner_t id)
+{
+ return au_do_flush(file, id, au_do_flush_dir);
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int au_do_fsync_dir_no_file(struct dentry *dentry, int datasync)
+{
+ int err;
+ aufs_bindex_t bend, bindex;
+ struct inode *inode;
+ struct super_block *sb;
+
+ err = 0;
+ sb = dentry->d_sb;
+ inode = dentry->d_inode;
+ IMustLock(inode);
+ bend = au_dbend(dentry);
+ for (bindex = au_dbstart(dentry); !err && bindex <= bend; bindex++) {
+ struct path h_path;
+
+ if (au_test_ro(sb, bindex, inode))
+ continue;
+ h_path.dentry = au_h_dptr(dentry, bindex);
+ if (!h_path.dentry)
+ continue;
+
+ h_path.mnt = au_sbr_mnt(sb, bindex);
+ err = vfsub_fsync(NULL, &h_path, datasync);
+ }
+
+ return err;
+}
+
+static int au_do_fsync_dir(struct file *file, int datasync)
+{
+ int err;
+ aufs_bindex_t bend, bindex;
+ struct file *h_file;
+ struct super_block *sb;
+ struct inode *inode;
+
+ err = au_reval_and_lock_fdi(file, reopen_dir, /*wlock*/1);
+ if (unlikely(err))
+ goto out;
+
+ sb = file->f_dentry->d_sb;
+ inode = file->f_dentry->d_inode;
+ bend = au_fbend_dir(file);
+ for (bindex = au_fbstart(file); !err && bindex <= bend; bindex++) {
+ h_file = au_hf_dir(file, bindex);
+ if (!h_file || au_test_ro(sb, bindex, inode))
+ continue;
+
+ err = vfsub_fsync(h_file, &h_file->f_path, datasync);
+ }
+
+out:
+ return err;
+}
+
+/*
+ * @file may be NULL
+ */
+static int aufs_fsync_dir(struct file *file, loff_t start, loff_t end,
+ int datasync)
+{
+ int err;
+ struct dentry *dentry;
+ struct super_block *sb;
+ struct mutex *mtx;
+
+ err = 0;
+ dentry = file->f_dentry;
+ mtx = &dentry->d_inode->i_mutex;
+ mutex_lock(mtx);
+ sb = dentry->d_sb;
+ si_noflush_read_lock(sb);
+ if (file)
+ err = au_do_fsync_dir(file, datasync);
+ else {
+ di_write_lock_child(dentry);
+ err = au_do_fsync_dir_no_file(dentry, datasync);
+ }
+ au_cpup_attr_timesizes(dentry->d_inode);
+ di_write_unlock(dentry);
+ if (file)
+ fi_write_unlock(file);
+
+ si_read_unlock(sb);
+ mutex_unlock(mtx);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int aufs_readdir(struct file *file, void *dirent, filldir_t filldir)
+{
+ int err;
+ struct dentry *dentry;
+ struct inode *inode, *h_inode;
+ struct super_block *sb;
+
+ dentry = file->f_dentry;
+ inode = dentry->d_inode;
+ IMustLock(inode);
+
+ sb = dentry->d_sb;
+ si_read_lock(sb, AuLock_FLUSH);
+ err = au_reval_and_lock_fdi(file, reopen_dir, /*wlock*/1);
+ if (unlikely(err))
+ goto out;
+ err = au_alive_dir(dentry);
+ if (!err)
+ err = au_vdir_init(file);
+ di_downgrade_lock(dentry, AuLock_IR);
+ if (unlikely(err))
+ goto out_unlock;
+
+ h_inode = au_h_iptr(inode, au_ibstart(inode));
+ if (!au_test_nfsd()) {
+ err = au_vdir_fill_de(file, dirent, filldir);
+ fsstack_copy_attr_atime(inode, h_inode);
+ } else {
+ /*
+ * nfsd filldir may call lookup_one_len(), vfs_getattr(),
+ * encode_fh() and others.
+ */
+ atomic_inc(&h_inode->i_count);
+ di_read_unlock(dentry, AuLock_IR);
+ si_read_unlock(sb);
+ err = au_vdir_fill_de(file, dirent, filldir);
+ fsstack_copy_attr_atime(inode, h_inode);
+ fi_write_unlock(file);
+ iput(h_inode);
+
+ AuTraceErr(err);
+ return err;
+ }
+
+out_unlock:
+ di_read_unlock(dentry, AuLock_IR);
+ fi_write_unlock(file);
+out:
+ si_read_unlock(sb);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+#define AuTestEmpty_WHONLY 1
+#define AuTestEmpty_CALLED (1 << 1)
+#define AuTestEmpty_SHWH (1 << 2)
+#define au_ftest_testempty(flags, name) ((flags) & AuTestEmpty_##name)
+#define au_fset_testempty(flags, name) \
+ do { (flags) |= AuTestEmpty_##name; } while (0)
+#define au_fclr_testempty(flags, name) \
+ do { (flags) &= ~AuTestEmpty_##name; } while (0)
+
+#ifndef CONFIG_AUFS_SHWH
+#undef AuTestEmpty_SHWH
+#define AuTestEmpty_SHWH 0
+#endif
+
+struct test_empty_arg {
+ struct au_nhash *whlist;
+ unsigned int flags;
+ int err;
+ aufs_bindex_t bindex;
+};
+
+static int test_empty_cb(void *__arg, const char *__name, int namelen,
+ loff_t offset __maybe_unused, u64 ino,
+ unsigned int d_type)
+{
+ struct test_empty_arg *arg = __arg;
+ char *name = (void *)__name;
+
+ arg->err = 0;
+ au_fset_testempty(arg->flags, CALLED);
+ /* smp_mb(); */
+ if (name[0] == '.'
+ && (namelen == 1 || (name[1] == '.' && namelen == 2)))
+ goto out; /* success */
+
+ if (namelen <= AUFS_WH_PFX_LEN
+ || memcmp(name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) {
+ if (au_ftest_testempty(arg->flags, WHONLY)
+ && !au_nhash_test_known_wh(arg->whlist, name, namelen))
+ arg->err = -ENOTEMPTY;
+ goto out;
+ }
+
+ name += AUFS_WH_PFX_LEN;
+ namelen -= AUFS_WH_PFX_LEN;
+ if (!au_nhash_test_known_wh(arg->whlist, name, namelen))
+ arg->err = au_nhash_append_wh
+ (arg->whlist, name, namelen, ino, d_type, arg->bindex,
+ au_ftest_testempty(arg->flags, SHWH));
+
+out:
+ /* smp_mb(); */
+ AuTraceErr(arg->err);
+ return arg->err;
+}
+
+static int do_test_empty(struct dentry *dentry, struct test_empty_arg *arg)
+{
+ int err;
+ struct file *h_file;
+
+ h_file = au_h_open(dentry, arg->bindex,
+ O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_LARGEFILE,
+ /*file*/NULL);
+ err = PTR_ERR(h_file);
+ if (IS_ERR(h_file))
+ goto out;
+
+ err = 0;
+ if (!au_opt_test(au_mntflags(dentry->d_sb), UDBA_NONE)
+ && !h_file->f_dentry->d_inode->i_nlink)
+ goto out_put;
+
+ do {
+ arg->err = 0;
+ au_fclr_testempty(arg->flags, CALLED);
+ /* smp_mb(); */
+ err = vfsub_readdir(h_file, test_empty_cb, arg);
+ if (err >= 0)
+ err = arg->err;
+ } while (!err && au_ftest_testempty(arg->flags, CALLED));
+
+out_put:
+ fput(h_file);
+ au_sbr_put(dentry->d_sb, arg->bindex);
+out:
+ return err;
+}
+
+struct do_test_empty_args {
+ int *errp;
+ struct dentry *dentry;
+ struct test_empty_arg *arg;
+};
+
+static void call_do_test_empty(void *args)
+{
+ struct do_test_empty_args *a = args;
+ *a->errp = do_test_empty(a->dentry, a->arg);
+}
+
+static int sio_test_empty(struct dentry *dentry, struct test_empty_arg *arg)
+{
+ int err, wkq_err;
+ struct dentry *h_dentry;
+ struct inode *h_inode;
+
+ h_dentry = au_h_dptr(dentry, arg->bindex);
+ h_inode = h_dentry->d_inode;
+ /* todo: i_mode changes anytime? */
+ mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
+ err = au_test_h_perm_sio(h_inode, MAY_EXEC | MAY_READ);
+ mutex_unlock(&h_inode->i_mutex);
+ if (!err)
+ err = do_test_empty(dentry, arg);
+ else {
+ struct do_test_empty_args args = {
+ .errp = &err,
+ .dentry = dentry,
+ .arg = arg
+ };
+ unsigned int flags = arg->flags;
+
+ wkq_err = au_wkq_wait(call_do_test_empty, &args);
+ if (unlikely(wkq_err))
+ err = wkq_err;
+ arg->flags = flags;
+ }
+
+ return err;
+}
+
+int au_test_empty_lower(struct dentry *dentry)
+{
+ int err;
+ unsigned int rdhash;
+ aufs_bindex_t bindex, bstart, btail;
+ struct au_nhash whlist;
+ struct test_empty_arg arg;
+
+ SiMustAnyLock(dentry->d_sb);
+
+ rdhash = au_sbi(dentry->d_sb)->si_rdhash;
+ if (!rdhash)
+ rdhash = au_rdhash_est(au_dir_size(/*file*/NULL, dentry));
+ err = au_nhash_alloc(&whlist, rdhash, GFP_NOFS);
+ if (unlikely(err))
+ goto out;
+
+ arg.flags = 0;
+ arg.whlist = &whlist;
+ bstart = au_dbstart(dentry);
+ if (au_opt_test(au_mntflags(dentry->d_sb), SHWH))
+ au_fset_testempty(arg.flags, SHWH);
+ arg.bindex = bstart;
+ err = do_test_empty(dentry, &arg);
+ if (unlikely(err))
+ goto out_whlist;
+
+ au_fset_testempty(arg.flags, WHONLY);
+ btail = au_dbtaildir(dentry);
+ for (bindex = bstart + 1; !err && bindex <= btail; bindex++) {
+ struct dentry *h_dentry;
+
+ h_dentry = au_h_dptr(dentry, bindex);
+ if (h_dentry && h_dentry->d_inode) {
+ arg.bindex = bindex;
+ err = do_test_empty(dentry, &arg);
+ }
+ }
+
+out_whlist:
+ au_nhash_wh_free(&whlist);
+out:
+ return err;
+}
+
+int au_test_empty(struct dentry *dentry, struct au_nhash *whlist)
+{
+ int err;
+ struct test_empty_arg arg;
+ aufs_bindex_t bindex, btail;
+
+ err = 0;
+ arg.whlist = whlist;
+ arg.flags = AuTestEmpty_WHONLY;
+ if (au_opt_test(au_mntflags(dentry->d_sb), SHWH))
+ au_fset_testempty(arg.flags, SHWH);
+ btail = au_dbtaildir(dentry);
+ for (bindex = au_dbstart(dentry); !err && bindex <= btail; bindex++) {
+ struct dentry *h_dentry;
+
+ h_dentry = au_h_dptr(dentry, bindex);
+ if (h_dentry && h_dentry->d_inode) {
+ arg.bindex = bindex;
+ err = sio_test_empty(dentry, &arg);
+ }
+ }
+
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+const struct file_operations aufs_dir_fop = {
+ .owner = THIS_MODULE,
+ .llseek = default_llseek,
+ .read = generic_read_dir,
+ .readdir = aufs_readdir,
+ .unlocked_ioctl = aufs_ioctl_dir,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = aufs_compat_ioctl_dir,
+#endif
+ .open = aufs_open_dir,
+ .release = aufs_release_dir,
+ .flush = aufs_flush_dir,
+ .fsync = aufs_fsync_dir
+};
diff -urN a/fs/aufs/dir.h b/fs/aufs/dir.h
--- a/fs/aufs/dir.h 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/dir.h 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,137 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * directory operations
+ */
+
+#ifndef __AUFS_DIR_H__
+#define __AUFS_DIR_H__
+
+#ifdef __KERNEL__
+
+#include <linux/fs.h>
+
+/* ---------------------------------------------------------------------- */
+
+/* need to be faster and smaller */
+
+struct au_nhash {
+ unsigned int nh_num;
+ struct hlist_head *nh_head;
+};
+
+struct au_vdir_destr {
+ unsigned char len;
+ unsigned char name[0];
+} __packed;
+
+struct au_vdir_dehstr {
+ struct hlist_node hash;
+ struct au_vdir_destr *str;
+} ____cacheline_aligned_in_smp;
+
+struct au_vdir_de {
+ ino_t de_ino;
+ unsigned char de_type;
+ /* caution: packed */
+ struct au_vdir_destr de_str;
+} __packed;
+
+struct au_vdir_wh {
+ struct hlist_node wh_hash;
+#ifdef CONFIG_AUFS_SHWH
+ ino_t wh_ino;
+ aufs_bindex_t wh_bindex;
+ unsigned char wh_type;
+#else
+ aufs_bindex_t wh_bindex;
+#endif
+ /* caution: packed */
+ struct au_vdir_destr wh_str;
+} __packed;
+
+union au_vdir_deblk_p {
+ unsigned char *deblk;
+ struct au_vdir_de *de;
+};
+
+struct au_vdir {
+ unsigned char **vd_deblk;
+ unsigned long vd_nblk;
+ struct {
+ unsigned long ul;
+ union au_vdir_deblk_p p;
+ } vd_last;
+
+ unsigned long vd_version;
+ unsigned int vd_deblk_sz;
+ unsigned long vd_jiffy;
+} ____cacheline_aligned_in_smp;
+
+/* ---------------------------------------------------------------------- */
+
+/* dir.c */
+extern const struct file_operations aufs_dir_fop;
+void au_add_nlink(struct inode *dir, struct inode *h_dir);
+void au_sub_nlink(struct inode *dir, struct inode *h_dir);
+loff_t au_dir_size(struct file *file, struct dentry *dentry);
+int au_test_empty_lower(struct dentry *dentry);
+int au_test_empty(struct dentry *dentry, struct au_nhash *whlist);
+
+/* vdir.c */
+unsigned int au_rdhash_est(loff_t sz);
+int au_nhash_alloc(struct au_nhash *nhash, unsigned int num_hash, gfp_t gfp);
+void au_nhash_wh_free(struct au_nhash *whlist);
+int au_nhash_test_longer_wh(struct au_nhash *whlist, aufs_bindex_t btgt,
+ int limit);
+int au_nhash_test_known_wh(struct au_nhash *whlist, char *name, int nlen);
+int au_nhash_append_wh(struct au_nhash *whlist, char *name, int nlen, ino_t ino,
+ unsigned int d_type, aufs_bindex_t bindex,
+ unsigned char shwh);
+void au_vdir_free(struct au_vdir *vdir);
+int au_vdir_init(struct file *file);
+int au_vdir_fill_de(struct file *file, void *dirent, filldir_t filldir);
+
+/* ioctl.c */
+long aufs_ioctl_dir(struct file *file, unsigned int cmd, unsigned long arg);
+
+#ifdef CONFIG_AUFS_RDU
+/* rdu.c */
+long au_rdu_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
+#ifdef CONFIG_COMPAT
+long au_rdu_compat_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg);
+#endif
+#else
+static inline long au_rdu_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ return -EINVAL;
+}
+#ifdef CONFIG_COMPAT
+static inline long au_rdu_compat_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ return -EINVAL;
+}
+#endif
+#endif
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_DIR_H__ */
diff -urN a/fs/aufs/dynop.c b/fs/aufs/dynop.c
--- a/fs/aufs/dynop.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/dynop.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,377 @@
+/*
+ * Copyright (C) 2010-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * dynamically customizable operations for regular files
+ */
+
+#include "aufs.h"
+
+#define DyPrSym(key) AuDbgSym(key->dk_op.dy_hop)
+
+/*
+ * How large will these lists be?
+ * Usually just a few elements, 20-30 at most for each, I guess.
+ */
+static struct au_splhead dynop[AuDyLast];
+
+static struct au_dykey *dy_gfind_get(struct au_splhead *spl, const void *h_op)
+{
+ struct au_dykey *key, *tmp;
+ struct list_head *head;
+
+ key = NULL;
+ head = &spl->head;
+ rcu_read_lock();
+ list_for_each_entry_rcu(tmp, head, dk_list)
+ if (tmp->dk_op.dy_hop == h_op) {
+ key = tmp;
+ kref_get(&key->dk_kref);
+ break;
+ }
+ rcu_read_unlock();
+
+ return key;
+}
+
+static struct au_dykey *dy_bradd(struct au_branch *br, struct au_dykey *key)
+{
+ struct au_dykey **k, *found;
+ const void *h_op = key->dk_op.dy_hop;
+ int i;
+
+ found = NULL;
+ k = br->br_dykey;
+ for (i = 0; i < AuBrDynOp; i++)
+ if (k[i]) {
+ if (k[i]->dk_op.dy_hop == h_op) {
+ found = k[i];
+ break;
+ }
+ } else
+ break;
+ if (!found) {
+ spin_lock(&br->br_dykey_lock);
+ for (; i < AuBrDynOp; i++)
+ if (k[i]) {
+ if (k[i]->dk_op.dy_hop == h_op) {
+ found = k[i];
+ break;
+ }
+ } else {
+ k[i] = key;
+ break;
+ }
+ spin_unlock(&br->br_dykey_lock);
+ BUG_ON(i == AuBrDynOp); /* expand the array */
+ }
+
+ return found;
+}
+
+/* kref_get() if @key is already added */
+static struct au_dykey *dy_gadd(struct au_splhead *spl, struct au_dykey *key)
+{
+ struct au_dykey *tmp, *found;
+ struct list_head *head;
+ const void *h_op = key->dk_op.dy_hop;
+
+ found = NULL;
+ head = &spl->head;
+ spin_lock(&spl->spin);
+ list_for_each_entry(tmp, head, dk_list)
+ if (tmp->dk_op.dy_hop == h_op) {
+ kref_get(&tmp->dk_kref);
+ found = tmp;
+ break;
+ }
+ if (!found)
+ list_add_rcu(&key->dk_list, head);
+ spin_unlock(&spl->spin);
+
+ if (!found)
+ DyPrSym(key);
+ return found;
+}
+
+static void dy_free_rcu(struct rcu_head *rcu)
+{
+ struct au_dykey *key;
+
+ key = container_of(rcu, struct au_dykey, dk_rcu);
+ DyPrSym(key);
+ kfree(key);
+}
+
+static void dy_free(struct kref *kref)
+{
+ struct au_dykey *key;
+ struct au_splhead *spl;
+
+ key = container_of(kref, struct au_dykey, dk_kref);
+ spl = dynop + key->dk_op.dy_type;
+ au_spl_del_rcu(&key->dk_list, spl);
+ call_rcu(&key->dk_rcu, dy_free_rcu);
+}
+
+void au_dy_put(struct au_dykey *key)
+{
+ kref_put(&key->dk_kref, dy_free);
+}
+
+/* ---------------------------------------------------------------------- */
+
+#define DyDbgSize(cnt, op) AuDebugOn(cnt != sizeof(op)/sizeof(void *))
+
+#ifdef CONFIG_AUFS_DEBUG
+#define DyDbgDeclare(cnt) unsigned int cnt = 0
+#define DyDbgInc(cnt) do { cnt++; } while (0)
+#else
+#define DyDbgDeclare(cnt) do {} while (0)
+#define DyDbgInc(cnt) do {} while (0)
+#endif
+
+#define DySet(func, dst, src, h_op, h_sb) do { \
+ DyDbgInc(cnt); \
+ if (h_op->func) { \
+ if (src.func) \
+ dst.func = src.func; \
+ else \
+ AuDbg("%s %s\n", au_sbtype(h_sb), #func); \
+ } \
+} while (0)
+
+#define DySetForce(func, dst, src) do { \
+ AuDebugOn(!src.func); \
+ DyDbgInc(cnt); \
+ dst.func = src.func; \
+} while (0)
+
+#define DySetAop(func) \
+ DySet(func, dyaop->da_op, aufs_aop, h_aop, h_sb)
+#define DySetAopForce(func) \
+ DySetForce(func, dyaop->da_op, aufs_aop)
+
+static void dy_aop(struct au_dykey *key, const void *h_op,
+ struct super_block *h_sb __maybe_unused)
+{
+ struct au_dyaop *dyaop = (void *)key;
+ const struct address_space_operations *h_aop = h_op;
+ DyDbgDeclare(cnt);
+
+ AuDbg("%s\n", au_sbtype(h_sb));
+
+ DySetAop(writepage);
+ DySetAopForce(readpage); /* force */
+ DySetAop(writepages);
+ DySetAop(set_page_dirty);
+ DySetAop(readpages);
+ DySetAop(write_begin);
+ DySetAop(write_end);
+ DySetAop(bmap);
+ DySetAop(invalidatepage);
+ DySetAop(releasepage);
+ DySetAop(freepage);
+ /* these two will be changed according to an aufs mount option */
+ DySetAop(direct_IO);
+ DySetAop(get_xip_mem);
+ DySetAop(migratepage);
+ DySetAop(launder_page);
+ DySetAop(is_partially_uptodate);
+ DySetAop(error_remove_page);
+
+ DyDbgSize(cnt, *h_aop);
+ dyaop->da_get_xip_mem = h_aop->get_xip_mem;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static void dy_bug(struct kref *kref)
+{
+ BUG();
+}
+
+static struct au_dykey *dy_get(struct au_dynop *op, struct au_branch *br)
+{
+ struct au_dykey *key, *old;
+ struct au_splhead *spl;
+ struct op {
+ unsigned int sz;
+ void (*set)(struct au_dykey *key, const void *h_op,
+ struct super_block *h_sb __maybe_unused);
+ };
+ static const struct op a[] = {
+ [AuDy_AOP] = {
+ .sz = sizeof(struct au_dyaop),
+ .set = dy_aop
+ }
+ };
+ const struct op *p;
+
+ spl = dynop + op->dy_type;
+ key = dy_gfind_get(spl, op->dy_hop);
+ if (key)
+ goto out_add; /* success */
+
+ p = a + op->dy_type;
+ key = kzalloc(p->sz, GFP_NOFS);
+ if (unlikely(!key)) {
+ key = ERR_PTR(-ENOMEM);
+ goto out;
+ }
+
+ key->dk_op.dy_hop = op->dy_hop;
+ kref_init(&key->dk_kref);
+ p->set(key, op->dy_hop, br->br_mnt->mnt_sb);
+ old = dy_gadd(spl, key);
+ if (old) {
+ kfree(key);
+ key = old;
+ }
+
+out_add:
+ old = dy_bradd(br, key);
+ if (old)
+ /* its ref-count should never be zero here */
+ kref_put(&key->dk_kref, dy_bug);
+out:
+ return key;
+}
+
+/* ---------------------------------------------------------------------- */
+/*
+ * Aufs prohibits O_DIRECT by defaut even if the branch supports it.
+ * This behaviour is neccessary to return an error from open(O_DIRECT) instead
+ * of the succeeding I/O. The dio mount option enables O_DIRECT and makes
+ * open(O_DIRECT) always succeed, but the succeeding I/O may return an error.
+ * See the aufs manual in detail.
+ *
+ * To keep this behaviour, aufs has to set NULL to ->get_xip_mem too, and the
+ * performance of fadvise() and madvise() may be affected.
+ */
+static void dy_adx(struct au_dyaop *dyaop, int do_dx)
+{
+ if (!do_dx) {
+ dyaop->da_op.direct_IO = NULL;
+ dyaop->da_op.get_xip_mem = NULL;
+ } else {
+ dyaop->da_op.direct_IO = aufs_aop.direct_IO;
+ dyaop->da_op.get_xip_mem = aufs_aop.get_xip_mem;
+ if (!dyaop->da_get_xip_mem)
+ dyaop->da_op.get_xip_mem = NULL;
+ }
+}
+
+static struct au_dyaop *dy_aget(struct au_branch *br,
+ const struct address_space_operations *h_aop,
+ int do_dx)
+{
+ struct au_dyaop *dyaop;
+ struct au_dynop op;
+
+ op.dy_type = AuDy_AOP;
+ op.dy_haop = h_aop;
+ dyaop = (void *)dy_get(&op, br);
+ if (IS_ERR(dyaop))
+ goto out;
+ dy_adx(dyaop, do_dx);
+
+out:
+ return dyaop;
+}
+
+int au_dy_iaop(struct inode *inode, aufs_bindex_t bindex,
+ struct inode *h_inode)
+{
+ int err, do_dx;
+ struct super_block *sb;
+ struct au_branch *br;
+ struct au_dyaop *dyaop;
+
+ AuDebugOn(!S_ISREG(h_inode->i_mode));
+ IiMustWriteLock(inode);
+
+ sb = inode->i_sb;
+ br = au_sbr(sb, bindex);
+ do_dx = !!au_opt_test(au_mntflags(sb), DIO);
+ dyaop = dy_aget(br, h_inode->i_mapping->a_ops, do_dx);
+ err = PTR_ERR(dyaop);
+ if (IS_ERR(dyaop))
+ /* unnecessary to call dy_fput() */
+ goto out;
+
+ err = 0;
+ inode->i_mapping->a_ops = &dyaop->da_op;
+
+out:
+ return err;
+}
+
+/*
+ * Is it safe to replace a_ops during the inode/file is in operation?
+ * Yes, I hope so.
+ */
+int au_dy_irefresh(struct inode *inode)
+{
+ int err;
+ aufs_bindex_t bstart;
+ struct inode *h_inode;
+
+ err = 0;
+ if (S_ISREG(inode->i_mode)) {
+ bstart = au_ibstart(inode);
+ h_inode = au_h_iptr(inode, bstart);
+ err = au_dy_iaop(inode, bstart, h_inode);
+ }
+ return err;
+}
+
+void au_dy_arefresh(int do_dx)
+{
+ struct au_splhead *spl;
+ struct list_head *head;
+ struct au_dykey *key;
+
+ spl = dynop + AuDy_AOP;
+ head = &spl->head;
+ spin_lock(&spl->spin);
+ list_for_each_entry(key, head, dk_list)
+ dy_adx((void *)key, do_dx);
+ spin_unlock(&spl->spin);
+}
+
+/* ---------------------------------------------------------------------- */
+
+void __init au_dy_init(void)
+{
+ int i;
+
+ /* make sure that 'struct au_dykey *' can be any type */
+ BUILD_BUG_ON(offsetof(struct au_dyaop, da_key));
+
+ for (i = 0; i < AuDyLast; i++)
+ au_spl_init(dynop + i);
+}
+
+void au_dy_fin(void)
+{
+ int i;
+
+ for (i = 0; i < AuDyLast; i++)
+ WARN_ON(!list_empty(&dynop[i].head));
+}
diff -urN a/fs/aufs/dynop.h b/fs/aufs/dynop.h
--- a/fs/aufs/dynop.h 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/dynop.h 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2010-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * dynamically customizable operations (for regular files only)
+ */
+
+#ifndef __AUFS_DYNOP_H__
+#define __AUFS_DYNOP_H__
+
+#ifdef __KERNEL__
+
+#include "inode.h"
+
+enum {AuDy_AOP, AuDyLast};
+
+struct au_dynop {
+ int dy_type;
+ union {
+ const void *dy_hop;
+ const struct address_space_operations *dy_haop;
+ };
+};
+
+struct au_dykey {
+ union {
+ struct list_head dk_list;
+ struct rcu_head dk_rcu;
+ };
+ struct au_dynop dk_op;
+
+ /*
+ * during I am in the branch local array, kref is gotten. when the
+ * branch is removed, kref is put.
+ */
+ struct kref dk_kref;
+};
+
+/* stop unioning since their sizes are very different from each other */
+struct au_dyaop {
+ struct au_dykey da_key;
+ struct address_space_operations da_op; /* not const */
+ int (*da_get_xip_mem)(struct address_space *, pgoff_t, int,
+ void **, unsigned long *);
+};
+
+/* ---------------------------------------------------------------------- */
+
+/* dynop.c */
+struct au_branch;
+void au_dy_put(struct au_dykey *key);
+int au_dy_iaop(struct inode *inode, aufs_bindex_t bindex,
+ struct inode *h_inode);
+int au_dy_irefresh(struct inode *inode);
+void au_dy_arefresh(int do_dio);
+
+void __init au_dy_init(void);
+void au_dy_fin(void);
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_DYNOP_H__ */
diff -urN a/fs/aufs/export.c b/fs/aufs/export.c
--- a/fs/aufs/export.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/export.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,804 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * export via nfs
+ */
+
+#include <linux/exportfs.h>
+#include <linux/mnt_namespace.h>
+#include <linux/namei.h>
+#include <linux/nsproxy.h>
+#include <linux/random.h>
+#include <linux/writeback.h>
+#include "aufs.h"
+
+union conv {
+#ifdef CONFIG_AUFS_INO_T_64
+ __u32 a[2];
+#else
+ __u32 a[1];
+#endif
+ ino_t ino;
+};
+
+static ino_t decode_ino(__u32 *a)
+{
+ union conv u;
+
+ BUILD_BUG_ON(sizeof(u.ino) != sizeof(u.a));
+ u.a[0] = a[0];
+#ifdef CONFIG_AUFS_INO_T_64
+ u.a[1] = a[1];
+#endif
+ return u.ino;
+}
+
+static void encode_ino(__u32 *a, ino_t ino)
+{
+ union conv u;
+
+ u.ino = ino;
+ a[0] = u.a[0];
+#ifdef CONFIG_AUFS_INO_T_64
+ a[1] = u.a[1];
+#endif
+}
+
+/* NFS file handle */
+enum {
+ Fh_br_id,
+ Fh_sigen,
+#ifdef CONFIG_AUFS_INO_T_64
+ /* support 64bit inode number */
+ Fh_ino1,
+ Fh_ino2,
+ Fh_dir_ino1,
+ Fh_dir_ino2,
+#else
+ Fh_ino1,
+ Fh_dir_ino1,
+#endif
+ Fh_igen,
+ Fh_h_type,
+ Fh_tail,
+
+ Fh_ino = Fh_ino1,
+ Fh_dir_ino = Fh_dir_ino1
+};
+
+static int au_test_anon(struct dentry *dentry)
+{
+ /* note: read d_flags without d_lock */
+ return !!(dentry->d_flags & DCACHE_DISCONNECTED);
+}
+
+/* ---------------------------------------------------------------------- */
+/* inode generation external table */
+
+void au_xigen_inc(struct inode *inode)
+{
+ loff_t pos;
+ ssize_t sz;
+ __u32 igen;
+ struct super_block *sb;
+ struct au_sbinfo *sbinfo;
+
+ sb = inode->i_sb;
+ AuDebugOn(!au_opt_test(au_mntflags(sb), XINO));
+
+ sbinfo = au_sbi(sb);
+ pos = inode->i_ino;
+ pos *= sizeof(igen);
+ igen = inode->i_generation + 1;
+ sz = xino_fwrite(sbinfo->si_xwrite, sbinfo->si_xigen, &igen,
+ sizeof(igen), &pos);
+ if (sz == sizeof(igen))
+ return; /* success */
+
+ if (unlikely(sz >= 0))
+ AuIOErr("xigen error (%zd)\n", sz);
+}
+
+int au_xigen_new(struct inode *inode)
+{
+ int err;
+ loff_t pos;
+ ssize_t sz;
+ struct super_block *sb;
+ struct au_sbinfo *sbinfo;
+ struct file *file;
+
+ err = 0;
+ /* todo: dirty, at mount time */
+ if (inode->i_ino == AUFS_ROOT_INO)
+ goto out;
+ sb = inode->i_sb;
+ SiMustAnyLock(sb);
+ if (unlikely(!au_opt_test(au_mntflags(sb), XINO)))
+ goto out;
+
+ err = -EFBIG;
+ pos = inode->i_ino;
+ if (unlikely(au_loff_max / sizeof(inode->i_generation) - 1 < pos)) {
+ AuIOErr1("too large i%lld\n", pos);
+ goto out;
+ }
+ pos *= sizeof(inode->i_generation);
+
+ err = 0;
+ sbinfo = au_sbi(sb);
+ file = sbinfo->si_xigen;
+ BUG_ON(!file);
+
+ if (i_size_read(file->f_dentry->d_inode)
+ < pos + sizeof(inode->i_generation)) {
+ inode->i_generation = atomic_inc_return(&sbinfo->si_xigen_next);
+ sz = xino_fwrite(sbinfo->si_xwrite, file, &inode->i_generation,
+ sizeof(inode->i_generation), &pos);
+ } else
+ sz = xino_fread(sbinfo->si_xread, file, &inode->i_generation,
+ sizeof(inode->i_generation), &pos);
+ if (sz == sizeof(inode->i_generation))
+ goto out; /* success */
+
+ err = sz;
+ if (unlikely(sz >= 0)) {
+ err = -EIO;
+ AuIOErr("xigen error (%zd)\n", sz);
+ }
+
+out:
+ return err;
+}
+
+int au_xigen_set(struct super_block *sb, struct file *base)
+{
+ int err;
+ struct au_sbinfo *sbinfo;
+ struct file *file;
+
+ SiMustWriteLock(sb);
+
+ sbinfo = au_sbi(sb);
+ file = au_xino_create2(base, sbinfo->si_xigen);
+ err = PTR_ERR(file);
+ if (IS_ERR(file))
+ goto out;
+ err = 0;
+ if (sbinfo->si_xigen)
+ fput(sbinfo->si_xigen);
+ sbinfo->si_xigen = file;
+
+out:
+ return err;
+}
+
+void au_xigen_clr(struct super_block *sb)
+{
+ struct au_sbinfo *sbinfo;
+
+ SiMustWriteLock(sb);
+
+ sbinfo = au_sbi(sb);
+ if (sbinfo->si_xigen) {
+ fput(sbinfo->si_xigen);
+ sbinfo->si_xigen = NULL;
+ }
+}
+
+/* ---------------------------------------------------------------------- */
+
+static struct dentry *decode_by_ino(struct super_block *sb, ino_t ino,
+ ino_t dir_ino)
+{
+ struct dentry *dentry, *d;
+ struct inode *inode;
+ unsigned int sigen;
+
+ dentry = NULL;
+ inode = ilookup(sb, ino);
+ if (!inode)
+ goto out;
+
+ dentry = ERR_PTR(-ESTALE);
+ sigen = au_sigen(sb);
+ if (unlikely(is_bad_inode(inode)
+ || IS_DEADDIR(inode)
+ || sigen != au_iigen(inode)))
+ goto out_iput;
+
+ dentry = NULL;
+ if (!dir_ino || S_ISDIR(inode->i_mode))
+ dentry = d_find_alias(inode);
+ else {
+ spin_lock(&inode->i_lock);
+ list_for_each_entry(d, &inode->i_dentry, d_alias) {
+ spin_lock(&d->d_lock);
+ if (!au_test_anon(d)
+ && d->d_parent->d_inode->i_ino == dir_ino) {
+ dentry = dget_dlock(d);
+ spin_unlock(&d->d_lock);
+ break;
+ }
+ spin_unlock(&d->d_lock);
+ }
+ spin_unlock(&inode->i_lock);
+ }
+ if (unlikely(dentry && au_digen_test(dentry, sigen))) {
+ /* need to refresh */
+ dput(dentry);
+ dentry = NULL;
+ }
+
+out_iput:
+ iput(inode);
+out:
+ AuTraceErrPtr(dentry);
+ return dentry;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* todo: dirty? */
+/* if exportfs_decode_fh() passed vfsmount*, we could be happy */
+
+struct au_compare_mnt_args {
+ /* input */
+ struct super_block *sb;
+
+ /* output */
+ struct vfsmount *mnt;
+};
+
+static int au_compare_mnt(struct vfsmount *mnt, void *arg)
+{
+ struct au_compare_mnt_args *a = arg;
+
+ if (mnt->mnt_sb != a->sb)
+ return 0;
+ a->mnt = mntget(mnt);
+ return 1;
+}
+
+static struct vfsmount *au_mnt_get(struct super_block *sb)
+{
+ int err;
+ struct au_compare_mnt_args args = {
+ .sb = sb
+ };
+ struct mnt_namespace *ns;
+
+ br_read_lock(vfsmount_lock);
+ /* no get/put ?? */
+ AuDebugOn(!current->nsproxy);
+ ns = current->nsproxy->mnt_ns;
+ AuDebugOn(!ns);
+ err = iterate_mounts(au_compare_mnt, &args, ns->root);
+ br_read_unlock(vfsmount_lock);
+ AuDebugOn(!err);
+ AuDebugOn(!args.mnt);
+ return args.mnt;
+}
+
+struct au_nfsd_si_lock {
+ unsigned int sigen;
+ aufs_bindex_t bindex, br_id;
+ unsigned char force_lock;
+};
+
+static int si_nfsd_read_lock(struct super_block *sb,
+ struct au_nfsd_si_lock *nsi_lock)
+{
+ int err;
+ aufs_bindex_t bindex;
+
+ si_read_lock(sb, AuLock_FLUSH);
+
+ /* branch id may be wrapped around */
+ err = 0;
+ bindex = au_br_index(sb, nsi_lock->br_id);
+ if (bindex >= 0 && nsi_lock->sigen + AUFS_BRANCH_MAX > au_sigen(sb))
+ goto out; /* success */
+
+ err = -ESTALE;
+ bindex = -1;
+ if (!nsi_lock->force_lock)
+ si_read_unlock(sb);
+
+out:
+ nsi_lock->bindex = bindex;
+ return err;
+}
+
+struct find_name_by_ino {
+ int called, found;
+ ino_t ino;
+ char *name;
+ int namelen;
+};
+
+static int
+find_name_by_ino(void *arg, const char *name, int namelen, loff_t offset,
+ u64 ino, unsigned int d_type)
+{
+ struct find_name_by_ino *a = arg;
+
+ a->called++;
+ if (a->ino != ino)
+ return 0;
+
+ memcpy(a->name, name, namelen);
+ a->namelen = namelen;
+ a->found = 1;
+ return 1;
+}
+
+static struct dentry *au_lkup_by_ino(struct path *path, ino_t ino,
+ struct au_nfsd_si_lock *nsi_lock)
+{
+ struct dentry *dentry, *parent;
+ struct file *file;
+ struct inode *dir;
+ struct find_name_by_ino arg;
+ int err;
+
+ parent = path->dentry;
+ if (nsi_lock)
+ si_read_unlock(parent->d_sb);
+ file = vfsub_dentry_open(path, au_dir_roflags);
+ dentry = (void *)file;
+ if (IS_ERR(file))
+ goto out;
+
+ dentry = ERR_PTR(-ENOMEM);
+ arg.name = __getname_gfp(GFP_NOFS);
+ if (unlikely(!arg.name))
+ goto out_file;
+ arg.ino = ino;
+ arg.found = 0;
+ do {
+ arg.called = 0;
+ /* smp_mb(); */
+ err = vfsub_readdir(file, find_name_by_ino, &arg);
+ } while (!err && !arg.found && arg.called);
+ dentry = ERR_PTR(err);
+ if (unlikely(err))
+ goto out_name;
+ dentry = ERR_PTR(-ENOENT);
+ if (!arg.found)
+ goto out_name;
+
+ /* do not call au_lkup_one() */
+ dir = parent->d_inode;
+ mutex_lock(&dir->i_mutex);
+ dentry = vfsub_lookup_one_len(arg.name, parent, arg.namelen);
+ mutex_unlock(&dir->i_mutex);
+ AuTraceErrPtr(dentry);
+ if (IS_ERR(dentry))
+ goto out_name;
+ AuDebugOn(au_test_anon(dentry));
+ if (unlikely(!dentry->d_inode)) {
+ dput(dentry);
+ dentry = ERR_PTR(-ENOENT);
+ }
+
+out_name:
+ __putname(arg.name);
+out_file:
+ fput(file);
+out:
+ if (unlikely(nsi_lock
+ && si_nfsd_read_lock(parent->d_sb, nsi_lock) < 0))
+ if (!IS_ERR(dentry)) {
+ dput(dentry);
+ dentry = ERR_PTR(-ESTALE);
+ }
+ AuTraceErrPtr(dentry);
+ return dentry;
+}
+
+static struct dentry *decode_by_dir_ino(struct super_block *sb, ino_t ino,
+ ino_t dir_ino,
+ struct au_nfsd_si_lock *nsi_lock)
+{
+ struct dentry *dentry;
+ struct path path;
+
+ if (dir_ino != AUFS_ROOT_INO) {
+ path.dentry = decode_by_ino(sb, dir_ino, 0);
+ dentry = path.dentry;
+ if (!path.dentry || IS_ERR(path.dentry))
+ goto out;
+ AuDebugOn(au_test_anon(path.dentry));
+ } else
+ path.dentry = dget(sb->s_root);
+
+ path.mnt = au_mnt_get(sb);
+ dentry = au_lkup_by_ino(&path, ino, nsi_lock);
+ path_put(&path);
+
+out:
+ AuTraceErrPtr(dentry);
+ return dentry;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int h_acceptable(void *expv, struct dentry *dentry)
+{
+ return 1;
+}
+
+static char *au_build_path(struct dentry *h_parent, struct path *h_rootpath,
+ char *buf, int len, struct super_block *sb)
+{
+ char *p;
+ int n;
+ struct path path;
+
+ p = d_path(h_rootpath, buf, len);
+ if (IS_ERR(p))
+ goto out;
+ n = strlen(p);
+
+ path.mnt = h_rootpath->mnt;
+ path.dentry = h_parent;
+ p = d_path(&path, buf, len);
+ if (IS_ERR(p))
+ goto out;
+ if (n != 1)
+ p += n;
+
+ path.mnt = au_mnt_get(sb);
+ path.dentry = sb->s_root;
+ p = d_path(&path, buf, len - strlen(p));
+ mntput(path.mnt);
+ if (IS_ERR(p))
+ goto out;
+ if (n != 1)
+ p[strlen(p)] = '/';
+
+out:
+ AuTraceErrPtr(p);
+ return p;
+}
+
+static
+struct dentry *decode_by_path(struct super_block *sb, ino_t ino, __u32 *fh,
+ int fh_len, struct au_nfsd_si_lock *nsi_lock)
+{
+ struct dentry *dentry, *h_parent, *root;
+ struct super_block *h_sb;
+ char *pathname, *p;
+ struct vfsmount *h_mnt;
+ struct au_branch *br;
+ int err;
+ struct path path;
+
+ br = au_sbr(sb, nsi_lock->bindex);
+ h_mnt = br->br_mnt;
+ h_sb = h_mnt->mnt_sb;
+ /* todo: call lower fh_to_dentry()? fh_to_parent()? */
+ h_parent = exportfs_decode_fh(h_mnt, (void *)(fh + Fh_tail),
+ fh_len - Fh_tail, fh[Fh_h_type],
+ h_acceptable, /*context*/NULL);
+ dentry = h_parent;
+ if (unlikely(!h_parent || IS_ERR(h_parent))) {
+ AuWarn1("%s decode_fh failed, %ld\n",
+ au_sbtype(h_sb), PTR_ERR(h_parent));
+ goto out;
+ }
+ dentry = NULL;
+ if (unlikely(au_test_anon(h_parent))) {
+ AuWarn1("%s decode_fh returned a disconnected dentry\n",
+ au_sbtype(h_sb));
+ goto out_h_parent;
+ }
+
+ dentry = ERR_PTR(-ENOMEM);
+ pathname = (void *)__get_free_page(GFP_NOFS);
+ if (unlikely(!pathname))
+ goto out_h_parent;
+
+ root = sb->s_root;
+ path.mnt = h_mnt;
+ di_read_lock_parent(root, !AuLock_IR);
+ path.dentry = au_h_dptr(root, nsi_lock->bindex);
+ di_read_unlock(root, !AuLock_IR);
+ p = au_build_path(h_parent, &path, pathname, PAGE_SIZE, sb);
+ dentry = (void *)p;
+ if (IS_ERR(p))
+ goto out_pathname;
+
+ si_read_unlock(sb);
+ err = vfsub_kern_path(p, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path);
+ dentry = ERR_PTR(err);
+ if (unlikely(err))
+ goto out_relock;
+
+ dentry = ERR_PTR(-ENOENT);
+ AuDebugOn(au_test_anon(path.dentry));
+ if (unlikely(!path.dentry->d_inode))
+ goto out_path;
+
+ if (ino != path.dentry->d_inode->i_ino)
+ dentry = au_lkup_by_ino(&path, ino, /*nsi_lock*/NULL);
+ else
+ dentry = dget(path.dentry);
+
+out_path:
+ path_put(&path);
+out_relock:
+ if (unlikely(si_nfsd_read_lock(sb, nsi_lock) < 0))
+ if (!IS_ERR(dentry)) {
+ dput(dentry);
+ dentry = ERR_PTR(-ESTALE);
+ }
+out_pathname:
+ free_page((unsigned long)pathname);
+out_h_parent:
+ dput(h_parent);
+out:
+ AuTraceErrPtr(dentry);
+ return dentry;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static struct dentry *
+aufs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len,
+ int fh_type)
+{
+ struct dentry *dentry;
+ __u32 *fh = fid->raw;
+ struct au_branch *br;
+ ino_t ino, dir_ino;
+ struct au_nfsd_si_lock nsi_lock = {
+ .force_lock = 0
+ };
+
+ dentry = ERR_PTR(-ESTALE);
+ /* it should never happen, but the file handle is unreliable */
+ if (unlikely(fh_len < Fh_tail))
+ goto out;
+ nsi_lock.sigen = fh[Fh_sigen];
+ nsi_lock.br_id = fh[Fh_br_id];
+
+ /* branch id may be wrapped around */
+ br = NULL;
+ if (unlikely(si_nfsd_read_lock(sb, &nsi_lock)))
+ goto out;
+ nsi_lock.force_lock = 1;
+
+ /* is this inode still cached? */
+ ino = decode_ino(fh + Fh_ino);
+ /* it should never happen */
+ if (unlikely(ino == AUFS_ROOT_INO))
+ goto out;
+
+ dir_ino = decode_ino(fh + Fh_dir_ino);
+ dentry = decode_by_ino(sb, ino, dir_ino);
+ if (IS_ERR(dentry))
+ goto out_unlock;
+ if (dentry)
+ goto accept;
+
+ /* is the parent dir cached? */
+ br = au_sbr(sb, nsi_lock.bindex);
+ atomic_inc(&br->br_count);
+ dentry = decode_by_dir_ino(sb, ino, dir_ino, &nsi_lock);
+ if (IS_ERR(dentry))
+ goto out_unlock;
+ if (dentry)
+ goto accept;
+
+ /* lookup path */
+ dentry = decode_by_path(sb, ino, fh, fh_len, &nsi_lock);
+ if (IS_ERR(dentry))
+ goto out_unlock;
+ if (unlikely(!dentry))
+ /* todo?: make it ESTALE */
+ goto out_unlock;
+
+accept:
+ if (!au_digen_test(dentry, au_sigen(sb))
+ && dentry->d_inode->i_generation == fh[Fh_igen])
+ goto out_unlock; /* success */
+
+ dput(dentry);
+ dentry = ERR_PTR(-ESTALE);
+out_unlock:
+ if (br)
+ atomic_dec(&br->br_count);
+ si_read_unlock(sb);
+out:
+ AuTraceErrPtr(dentry);
+ return dentry;
+}
+
+#if 0 /* reserved for future use */
+/* support subtreecheck option */
+static struct dentry *aufs_fh_to_parent(struct super_block *sb, struct fid *fid,
+ int fh_len, int fh_type)
+{
+ struct dentry *parent;
+ __u32 *fh = fid->raw;
+ ino_t dir_ino;
+
+ dir_ino = decode_ino(fh + Fh_dir_ino);
+ parent = decode_by_ino(sb, dir_ino, 0);
+ if (IS_ERR(parent))
+ goto out;
+ if (!parent)
+ parent = decode_by_path(sb, au_br_index(sb, fh[Fh_br_id]),
+ dir_ino, fh, fh_len);
+
+out:
+ AuTraceErrPtr(parent);
+ return parent;
+}
+#endif
+
+/* ---------------------------------------------------------------------- */
+
+static int aufs_encode_fh(struct dentry *dentry, __u32 *fh, int *max_len,
+ int connectable)
+{
+ int err;
+ aufs_bindex_t bindex, bend;
+ struct super_block *sb, *h_sb;
+ struct inode *inode;
+ struct dentry *parent, *h_parent;
+ struct au_branch *br;
+
+ AuDebugOn(au_test_anon(dentry));
+
+ parent = NULL;
+ err = -ENOSPC;
+ if (unlikely(*max_len <= Fh_tail)) {
+ AuWarn1("NFSv2 client (max_len %d)?\n", *max_len);
+ goto out;
+ }
+
+ err = FILEID_ROOT;
+ if (IS_ROOT(dentry)) {
+ AuDebugOn(dentry->d_inode->i_ino != AUFS_ROOT_INO);
+ goto out;
+ }
+
+ h_parent = NULL;
+ err = aufs_read_lock(dentry, AuLock_FLUSH | AuLock_IR | AuLock_GEN);
+ if (unlikely(err))
+ goto out;
+
+ inode = dentry->d_inode;
+ AuDebugOn(!inode);
+ sb = dentry->d_sb;
+#ifdef CONFIG_AUFS_DEBUG
+ if (unlikely(!au_opt_test(au_mntflags(sb), XINO)))
+ AuWarn1("NFS-exporting requires xino\n");
+#endif
+ err = -EIO;
+ parent = dget_parent(dentry);
+ di_read_lock_parent(parent, !AuLock_IR);
+ bend = au_dbtaildir(parent);
+ for (bindex = au_dbstart(parent); bindex <= bend; bindex++) {
+ h_parent = au_h_dptr(parent, bindex);
+ if (h_parent) {
+ dget(h_parent);
+ break;
+ }
+ }
+ if (unlikely(!h_parent))
+ goto out_unlock;
+
+ err = -EPERM;
+ br = au_sbr(sb, bindex);
+ h_sb = br->br_mnt->mnt_sb;
+ if (unlikely(!h_sb->s_export_op)) {
+ AuErr1("%s branch is not exportable\n", au_sbtype(h_sb));
+ goto out_dput;
+ }
+
+ fh[Fh_br_id] = br->br_id;
+ fh[Fh_sigen] = au_sigen(sb);
+ encode_ino(fh + Fh_ino, inode->i_ino);
+ encode_ino(fh + Fh_dir_ino, parent->d_inode->i_ino);
+ fh[Fh_igen] = inode->i_generation;
+
+ *max_len -= Fh_tail;
+ fh[Fh_h_type] = exportfs_encode_fh(h_parent, (void *)(fh + Fh_tail),
+ max_len,
+ /*connectable or subtreecheck*/0);
+ err = fh[Fh_h_type];
+ *max_len += Fh_tail;
+ /* todo: macros? */
+ if (err != 255)
+ err = 99;
+ else
+ AuWarn1("%s encode_fh failed\n", au_sbtype(h_sb));
+
+out_dput:
+ dput(h_parent);
+out_unlock:
+ di_read_unlock(parent, !AuLock_IR);
+ dput(parent);
+ aufs_read_unlock(dentry, AuLock_IR);
+out:
+ if (unlikely(err < 0))
+ err = 255;
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int aufs_commit_metadata(struct inode *inode)
+{
+ int err;
+ aufs_bindex_t bindex;
+ struct super_block *sb;
+ struct inode *h_inode;
+ int (*f)(struct inode *inode);
+
+ sb = inode->i_sb;
+ si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW);
+ ii_write_lock_child(inode);
+ bindex = au_ibstart(inode);
+ AuDebugOn(bindex < 0);
+ h_inode = au_h_iptr(inode, bindex);
+
+ f = h_inode->i_sb->s_export_op->commit_metadata;
+ if (f)
+ err = f(h_inode);
+ else {
+ struct writeback_control wbc = {
+ .sync_mode = WB_SYNC_ALL,
+ .nr_to_write = 0 /* metadata only */
+ };
+
+ err = sync_inode(h_inode, &wbc);
+ }
+
+ au_cpup_attr_timesizes(inode);
+ ii_write_unlock(inode);
+ si_read_unlock(sb);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static struct export_operations aufs_export_op = {
+ .fh_to_dentry = aufs_fh_to_dentry,
+ /* .fh_to_parent = aufs_fh_to_parent, */
+ .encode_fh = aufs_encode_fh,
+ .commit_metadata = aufs_commit_metadata
+};
+
+void au_export_init(struct super_block *sb)
+{
+ struct au_sbinfo *sbinfo;
+ __u32 u;
+
+ sb->s_export_op = &aufs_export_op;
+ sbinfo = au_sbi(sb);
+ sbinfo->si_xigen = NULL;
+ get_random_bytes(&u, sizeof(u));
+ BUILD_BUG_ON(sizeof(u) != sizeof(int));
+ atomic_set(&sbinfo->si_xigen_next, u);
+}
diff -urN a/fs/aufs/file.c b/fs/aufs/file.c
--- a/fs/aufs/file.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/file.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,673 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * handling file/dir, and address_space operation
+ */
+
+#include <linux/pagemap.h>
+#include "aufs.h"
+
+/* drop flags for writing */
+unsigned int au_file_roflags(unsigned int flags)
+{
+ flags &= ~(O_WRONLY | O_RDWR | O_APPEND | O_CREAT | O_TRUNC);
+ flags |= O_RDONLY | O_NOATIME;
+ return flags;
+}
+
+/* common functions to regular file and dir */
+struct file *au_h_open(struct dentry *dentry, aufs_bindex_t bindex, int flags,
+ struct file *file)
+{
+ struct file *h_file;
+ struct dentry *h_dentry;
+ struct inode *h_inode;
+ struct super_block *sb;
+ struct au_branch *br;
+ struct path h_path;
+ int err, exec_flag;
+
+ /* a race condition can happen between open and unlink/rmdir */
+ h_file = ERR_PTR(-ENOENT);
+ h_dentry = au_h_dptr(dentry, bindex);
+ if (au_test_nfsd() && !h_dentry)
+ goto out;
+ h_inode = h_dentry->d_inode;
+ if (au_test_nfsd() && !h_inode)
+ goto out;
+ spin_lock(&h_dentry->d_lock);
+ err = (!d_unhashed(dentry) && d_unlinked(h_dentry))
+ || !h_inode
+ /* || !dentry->d_inode->i_nlink */
+ ;
+ spin_unlock(&h_dentry->d_lock);
+ if (unlikely(err))
+ goto out;
+
+ sb = dentry->d_sb;
+ br = au_sbr(sb, bindex);
+ h_file = ERR_PTR(-EACCES);
+ exec_flag = flags & __FMODE_EXEC;
+ if (exec_flag && (br->br_mnt->mnt_flags & MNT_NOEXEC))
+ goto out;
+
+ /* drop flags for writing */
+ if (au_test_ro(sb, bindex, dentry->d_inode))
+ flags = au_file_roflags(flags);
+ flags &= ~O_CREAT;
+ atomic_inc(&br->br_count);
+ h_path.dentry = h_dentry;
+ h_path.mnt = br->br_mnt;
+ if (!au_special_file(h_inode->i_mode))
+ h_file = vfsub_dentry_open(&h_path, flags);
+ else {
+ /* this block depends upon the configuration */
+ di_read_unlock(dentry, AuLock_IR);
+ fi_write_unlock(file);
+ si_read_unlock(sb);
+ h_file = vfsub_dentry_open(&h_path, flags);
+ si_noflush_read_lock(sb);
+ fi_write_lock(file);
+ di_read_lock_child(dentry, AuLock_IR);
+ }
+ if (IS_ERR(h_file))
+ goto out_br;
+
+ if (exec_flag) {
+ err = deny_write_access(h_file);
+ if (unlikely(err)) {
+ fput(h_file);
+ h_file = ERR_PTR(err);
+ goto out_br;
+ }
+ }
+ fsnotify_open(h_file);
+ goto out; /* success */
+
+out_br:
+ atomic_dec(&br->br_count);
+out:
+ return h_file;
+}
+
+int au_do_open(struct file *file, int (*open)(struct file *file, int flags),
+ struct au_fidir *fidir)
+{
+ int err;
+ struct dentry *dentry;
+
+ err = au_finfo_init(file, fidir);
+ if (unlikely(err))
+ goto out;
+
+ dentry = file->f_dentry;
+ di_read_lock_child(dentry, AuLock_IR);
+ err = open(file, vfsub_file_flags(file));
+ di_read_unlock(dentry, AuLock_IR);
+
+ fi_write_unlock(file);
+ if (unlikely(err)) {
+ au_fi(file)->fi_hdir = NULL;
+ au_finfo_fin(file);
+ }
+
+out:
+ return err;
+}
+
+int au_reopen_nondir(struct file *file)
+{
+ int err;
+ aufs_bindex_t bstart;
+ struct dentry *dentry;
+ struct file *h_file, *h_file_tmp;
+
+ dentry = file->f_dentry;
+ AuDebugOn(au_special_file(dentry->d_inode->i_mode));
+ bstart = au_dbstart(dentry);
+ h_file_tmp = NULL;
+ if (au_fbstart(file) == bstart) {
+ h_file = au_hf_top(file);
+ if (file->f_mode == h_file->f_mode)
+ return 0; /* success */
+ h_file_tmp = h_file;
+ get_file(h_file_tmp);
+ au_set_h_fptr(file, bstart, NULL);
+ }
+ AuDebugOn(au_fi(file)->fi_hdir);
+ AuDebugOn(au_fbstart(file) < bstart);
+
+ h_file = au_h_open(dentry, bstart, vfsub_file_flags(file) & ~O_TRUNC,
+ file);
+ err = PTR_ERR(h_file);
+ if (IS_ERR(h_file))
+ goto out; /* todo: close all? */
+
+ err = 0;
+ au_set_fbstart(file, bstart);
+ au_set_h_fptr(file, bstart, h_file);
+ au_update_figen(file);
+ /* todo: necessary? */
+ /* file->f_ra = h_file->f_ra; */
+
+out:
+ if (h_file_tmp)
+ fput(h_file_tmp);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int au_reopen_wh(struct file *file, aufs_bindex_t btgt,
+ struct dentry *hi_wh)
+{
+ int err;
+ aufs_bindex_t bstart;
+ struct au_dinfo *dinfo;
+ struct dentry *h_dentry;
+ struct au_hdentry *hdp;
+
+ dinfo = au_di(file->f_dentry);
+ AuRwMustWriteLock(&dinfo->di_rwsem);
+
+ bstart = dinfo->di_bstart;
+ dinfo->di_bstart = btgt;
+ hdp = dinfo->di_hdentry;
+ h_dentry = hdp[0 + btgt].hd_dentry;
+ hdp[0 + btgt].hd_dentry = hi_wh;
+ err = au_reopen_nondir(file);
+ hdp[0 + btgt].hd_dentry = h_dentry;
+ dinfo->di_bstart = bstart;
+
+ return err;
+}
+
+static int au_ready_to_write_wh(struct file *file, loff_t len,
+ aufs_bindex_t bcpup)
+{
+ int err;
+ struct inode *inode, *h_inode;
+ struct dentry *dentry, *h_dentry, *hi_wh;
+
+ dentry = file->f_dentry;
+ au_update_dbstart(dentry);
+ inode = dentry->d_inode;
+ h_inode = NULL;
+ if (au_dbstart(dentry) <= bcpup && au_dbend(dentry) >= bcpup) {
+ h_dentry = au_h_dptr(dentry, bcpup);
+ if (h_dentry)
+ h_inode = h_dentry->d_inode;
+ }
+ hi_wh = au_hi_wh(inode, bcpup);
+ if (!hi_wh && !h_inode)
+ err = au_sio_cpup_wh(dentry, bcpup, len, file);
+ else
+ /* already copied-up after unlink */
+ err = au_reopen_wh(file, bcpup, hi_wh);
+
+ if (!err
+ && inode->i_nlink > 1
+ && au_opt_test(au_mntflags(dentry->d_sb), PLINK))
+ au_plink_append(inode, bcpup, au_h_dptr(dentry, bcpup));
+
+ return err;
+}
+
+/*
+ * prepare the @file for writing.
+ */
+int au_ready_to_write(struct file *file, loff_t len, struct au_pin *pin)
+{
+ int err;
+ aufs_bindex_t bstart, bcpup, dbstart;
+ struct dentry *dentry, *parent, *h_dentry;
+ struct inode *h_inode, *inode;
+ struct super_block *sb;
+ struct file *h_file;
+
+ dentry = file->f_dentry;
+ sb = dentry->d_sb;
+ inode = dentry->d_inode;
+ AuDebugOn(au_special_file(inode->i_mode));
+ bstart = au_fbstart(file);
+ err = au_test_ro(sb, bstart, inode);
+ if (!err && (au_hf_top(file)->f_mode & FMODE_WRITE)) {
+ err = au_pin(pin, dentry, bstart, AuOpt_UDBA_NONE, /*flags*/0);
+ goto out;
+ }
+
+ /* need to cpup or reopen */
+ parent = dget_parent(dentry);
+ di_write_lock_parent(parent);
+ err = AuWbrCopyup(au_sbi(sb), dentry);
+ bcpup = err;
+ if (unlikely(err < 0))
+ goto out_dgrade;
+ err = 0;
+
+ if (!d_unhashed(dentry) && !au_h_dptr(parent, bcpup)) {
+ err = au_cpup_dirs(dentry, bcpup);
+ if (unlikely(err))
+ goto out_dgrade;
+ }
+
+ err = au_pin(pin, dentry, bcpup, AuOpt_UDBA_NONE,
+ AuPin_DI_LOCKED | AuPin_MNT_WRITE);
+ if (unlikely(err))
+ goto out_dgrade;
+
+ h_dentry = au_hf_top(file)->f_dentry;
+ h_inode = h_dentry->d_inode;
+ dbstart = au_dbstart(dentry);
+ if (dbstart <= bcpup) {
+ h_dentry = au_h_dptr(dentry, bcpup);
+ AuDebugOn(!h_dentry);
+ h_inode = h_dentry->d_inode;
+ AuDebugOn(!h_inode);
+ bstart = bcpup;
+ }
+
+ if (dbstart <= bcpup /* just reopen */
+ || !d_unhashed(dentry) /* copyup and reopen */
+ ) {
+ mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
+ h_file = au_h_open_pre(dentry, bstart);
+ if (IS_ERR(h_file)) {
+ err = PTR_ERR(h_file);
+ h_file = NULL;
+ } else {
+ di_downgrade_lock(parent, AuLock_IR);
+ if (dbstart > bcpup)
+ err = au_sio_cpup_simple(dentry, bcpup, len,
+ AuCpup_DTIME);
+ if (!err)
+ err = au_reopen_nondir(file);
+ }
+ mutex_unlock(&h_inode->i_mutex);
+ au_h_open_post(dentry, bstart, h_file);
+ } else { /* copyup as wh and reopen */
+ /*
+ * since writable hfsplus branch is not supported,
+ * h_open_pre/post() are unnecessary.
+ */
+ mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
+ err = au_ready_to_write_wh(file, len, bcpup);
+ di_downgrade_lock(parent, AuLock_IR);
+ mutex_unlock(&h_inode->i_mutex);
+ }
+
+ if (!err) {
+ au_pin_set_parent_lflag(pin, /*lflag*/0);
+ goto out_dput; /* success */
+ }
+ au_unpin(pin);
+ goto out_unlock;
+
+out_dgrade:
+ di_downgrade_lock(parent, AuLock_IR);
+out_unlock:
+ di_read_unlock(parent, AuLock_IR);
+out_dput:
+ dput(parent);
+out:
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+int au_do_flush(struct file *file, fl_owner_t id,
+ int (*flush)(struct file *file, fl_owner_t id))
+{
+ int err;
+ struct dentry *dentry;
+ struct super_block *sb;
+ struct inode *inode;
+
+ dentry = file->f_dentry;
+ sb = dentry->d_sb;
+ inode = dentry->d_inode;
+ si_noflush_read_lock(sb);
+ fi_read_lock(file);
+ ii_read_lock_child(inode);
+
+ err = flush(file, id);
+ au_cpup_attr_timesizes(inode);
+
+ ii_read_unlock(inode);
+ fi_read_unlock(file);
+ si_read_unlock(sb);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int au_file_refresh_by_inode(struct file *file, int *need_reopen)
+{
+ int err;
+ aufs_bindex_t bstart;
+ struct au_pin pin;
+ struct au_finfo *finfo;
+ struct dentry *dentry, *parent, *hi_wh;
+ struct inode *inode;
+ struct super_block *sb;
+
+ FiMustWriteLock(file);
+
+ err = 0;
+ finfo = au_fi(file);
+ dentry = file->f_dentry;
+ sb = dentry->d_sb;
+ inode = dentry->d_inode;
+ bstart = au_ibstart(inode);
+ if (bstart == finfo->fi_btop || IS_ROOT(dentry))
+ goto out;
+
+ parent = dget_parent(dentry);
+ if (au_test_ro(sb, bstart, inode)) {
+ di_read_lock_parent(parent, !AuLock_IR);
+ err = AuWbrCopyup(au_sbi(sb), dentry);
+ bstart = err;
+ di_read_unlock(parent, !AuLock_IR);
+ if (unlikely(err < 0))
+ goto out_parent;
+ err = 0;
+ }
+
+ di_read_lock_parent(parent, AuLock_IR);
+ hi_wh = au_hi_wh(inode, bstart);
+ if (!S_ISDIR(inode->i_mode)
+ && au_opt_test(au_mntflags(sb), PLINK)
+ && au_plink_test(inode)
+ && !d_unhashed(dentry)) {
+ err = au_test_and_cpup_dirs(dentry, bstart);
+ if (unlikely(err))
+ goto out_unlock;
+
+ /* always superio. */
+ err = au_pin(&pin, dentry, bstart, AuOpt_UDBA_NONE,
+ AuPin_DI_LOCKED | AuPin_MNT_WRITE);
+ if (!err)
+ err = au_sio_cpup_simple(dentry, bstart, -1,
+ AuCpup_DTIME);
+ au_unpin(&pin);
+ } else if (hi_wh) {
+ /* already copied-up after unlink */
+ err = au_reopen_wh(file, bstart, hi_wh);
+ *need_reopen = 0;
+ }
+
+out_unlock:
+ di_read_unlock(parent, AuLock_IR);
+out_parent:
+ dput(parent);
+out:
+ return err;
+}
+
+static void au_do_refresh_dir(struct file *file)
+{
+ aufs_bindex_t bindex, bend, new_bindex, brid;
+ struct au_hfile *p, tmp, *q;
+ struct au_finfo *finfo;
+ struct super_block *sb;
+ struct au_fidir *fidir;
+
+ FiMustWriteLock(file);
+
+ sb = file->f_dentry->d_sb;
+ finfo = au_fi(file);
+ fidir = finfo->fi_hdir;
+ AuDebugOn(!fidir);
+ p = fidir->fd_hfile + finfo->fi_btop;
+ brid = p->hf_br->br_id;
+ bend = fidir->fd_bbot;
+ for (bindex = finfo->fi_btop; bindex <= bend; bindex++, p++) {
+ if (!p->hf_file)
+ continue;
+
+ new_bindex = au_br_index(sb, p->hf_br->br_id);
+ if (new_bindex == bindex)
+ continue;
+ if (new_bindex < 0) {
+ au_set_h_fptr(file, bindex, NULL);
+ continue;
+ }
+
+ /* swap two lower inode, and loop again */
+ q = fidir->fd_hfile + new_bindex;
+ tmp = *q;
+ *q = *p;
+ *p = tmp;
+ if (tmp.hf_file) {
+ bindex--;
+ p--;
+ }
+ }
+
+ p = fidir->fd_hfile;
+ if (!au_test_mmapped(file) && !d_unlinked(file->f_dentry)) {
+ bend = au_sbend(sb);
+ for (finfo->fi_btop = 0; finfo->fi_btop <= bend;
+ finfo->fi_btop++, p++)
+ if (p->hf_file) {
+ if (p->hf_file->f_dentry
+ && p->hf_file->f_dentry->d_inode)
+ break;
+ else
+ au_hfput(p, file);
+ }
+ } else {
+ bend = au_br_index(sb, brid);
+ for (finfo->fi_btop = 0; finfo->fi_btop < bend;
+ finfo->fi_btop++, p++)
+ if (p->hf_file)
+ au_hfput(p, file);
+ bend = au_sbend(sb);
+ }
+
+ p = fidir->fd_hfile + bend;
+ for (fidir->fd_bbot = bend; fidir->fd_bbot >= finfo->fi_btop;
+ fidir->fd_bbot--, p--)
+ if (p->hf_file) {
+ if (p->hf_file->f_dentry
+ && p->hf_file->f_dentry->d_inode)
+ break;
+ else
+ au_hfput(p, file);
+ }
+ AuDebugOn(fidir->fd_bbot < finfo->fi_btop);
+}
+
+/*
+ * after branch manipulating, refresh the file.
+ */
+static int refresh_file(struct file *file, int (*reopen)(struct file *file))
+{
+ int err, need_reopen;
+ aufs_bindex_t bend, bindex;
+ struct dentry *dentry;
+ struct au_finfo *finfo;
+ struct au_hfile *hfile;
+
+ dentry = file->f_dentry;
+ finfo = au_fi(file);
+ if (!finfo->fi_hdir) {
+ hfile = &finfo->fi_htop;
+ AuDebugOn(!hfile->hf_file);
+ bindex = au_br_index(dentry->d_sb, hfile->hf_br->br_id);
+ AuDebugOn(bindex < 0);
+ if (bindex != finfo->fi_btop)
+ au_set_fbstart(file, bindex);
+ } else {
+ err = au_fidir_realloc(finfo, au_sbend(dentry->d_sb) + 1);
+ if (unlikely(err))
+ goto out;
+ au_do_refresh_dir(file);
+ }
+
+ err = 0;
+ need_reopen = 1;
+ if (!au_test_mmapped(file))
+ err = au_file_refresh_by_inode(file, &need_reopen);
+ if (!err && need_reopen && !d_unlinked(dentry))
+ err = reopen(file);
+ if (!err) {
+ au_update_figen(file);
+ goto out; /* success */
+ }
+
+ /* error, close all lower files */
+ if (finfo->fi_hdir) {
+ bend = au_fbend_dir(file);
+ for (bindex = au_fbstart(file); bindex <= bend; bindex++)
+ au_set_h_fptr(file, bindex, NULL);
+ }
+
+out:
+ return err;
+}
+
+/* common function to regular file and dir */
+int au_reval_and_lock_fdi(struct file *file, int (*reopen)(struct file *file),
+ int wlock)
+{
+ int err;
+ unsigned int sigen, figen;
+ aufs_bindex_t bstart;
+ unsigned char pseudo_link;
+ struct dentry *dentry;
+ struct inode *inode;
+
+ err = 0;
+ dentry = file->f_dentry;
+ inode = dentry->d_inode;
+ AuDebugOn(au_special_file(inode->i_mode));
+ sigen = au_sigen(dentry->d_sb);
+ fi_write_lock(file);
+ figen = au_figen(file);
+ di_write_lock_child(dentry);
+ bstart = au_dbstart(dentry);
+ pseudo_link = (bstart != au_ibstart(inode));
+ if (sigen == figen && !pseudo_link && au_fbstart(file) == bstart) {
+ if (!wlock) {
+ di_downgrade_lock(dentry, AuLock_IR);
+ fi_downgrade_lock(file);
+ }
+ goto out; /* success */
+ }
+
+ AuDbg("sigen %d, figen %d\n", sigen, figen);
+ if (au_digen_test(dentry, sigen)) {
+ err = au_reval_dpath(dentry, sigen);
+ AuDebugOn(!err && au_digen_test(dentry, sigen));
+ }
+
+ if (!err)
+ err = refresh_file(file, reopen);
+ if (!err) {
+ if (!wlock) {
+ di_downgrade_lock(dentry, AuLock_IR);
+ fi_downgrade_lock(file);
+ }
+ } else {
+ di_write_unlock(dentry);
+ fi_write_unlock(file);
+ }
+
+out:
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* cf. aufs_nopage() */
+/* for madvise(2) */
+static int aufs_readpage(struct file *file __maybe_unused, struct page *page)
+{
+ unlock_page(page);
+ return 0;
+}
+
+/* it will never be called, but necessary to support O_DIRECT */
+static ssize_t aufs_direct_IO(int rw, struct kiocb *iocb,
+ const struct iovec *iov, loff_t offset,
+ unsigned long nr_segs)
+{ BUG(); return 0; }
+
+/*
+ * it will never be called, but madvise and fadvise behaves differently
+ * when get_xip_mem is defined
+ */
+static int aufs_get_xip_mem(struct address_space *mapping, pgoff_t pgoff,
+ int create, void **kmem, unsigned long *pfn)
+{ BUG(); return 0; }
+
+/* they will never be called. */
+#ifdef CONFIG_AUFS_DEBUG
+static int aufs_write_begin(struct file *file, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned flags,
+ struct page **pagep, void **fsdata)
+{ AuUnsupport(); return 0; }
+static int aufs_write_end(struct file *file, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned copied,
+ struct page *page, void *fsdata)
+{ AuUnsupport(); return 0; }
+static int aufs_writepage(struct page *page, struct writeback_control *wbc)
+{ AuUnsupport(); return 0; }
+
+static int aufs_set_page_dirty(struct page *page)
+{ AuUnsupport(); return 0; }
+static void aufs_invalidatepage(struct page *page, unsigned long offset)
+{ AuUnsupport(); }
+static int aufs_releasepage(struct page *page, gfp_t gfp)
+{ AuUnsupport(); return 0; }
+static int aufs_migratepage(struct address_space *mapping, struct page *newpage,
+ struct page *page)
+{ AuUnsupport(); return 0; }
+static int aufs_launder_page(struct page *page)
+{ AuUnsupport(); return 0; }
+static int aufs_is_partially_uptodate(struct page *page,
+ read_descriptor_t *desc,
+ unsigned long from)
+{ AuUnsupport(); return 0; }
+static int aufs_error_remove_page(struct address_space *mapping,
+ struct page *page)
+{ AuUnsupport(); return 0; }
+#endif /* CONFIG_AUFS_DEBUG */
+
+const struct address_space_operations aufs_aop = {
+ .readpage = aufs_readpage,
+ .direct_IO = aufs_direct_IO,
+ .get_xip_mem = aufs_get_xip_mem,
+#ifdef CONFIG_AUFS_DEBUG
+ .writepage = aufs_writepage,
+ /* no writepages, because of writepage */
+ .set_page_dirty = aufs_set_page_dirty,
+ /* no readpages, because of readpage */
+ .write_begin = aufs_write_begin,
+ .write_end = aufs_write_end,
+ /* no bmap, no block device */
+ .invalidatepage = aufs_invalidatepage,
+ .releasepage = aufs_releasepage,
+ .migratepage = aufs_migratepage,
+ .launder_page = aufs_launder_page,
+ .is_partially_uptodate = aufs_is_partially_uptodate,
+ .error_remove_page = aufs_error_remove_page
+#endif /* CONFIG_AUFS_DEBUG */
+};
diff -urN a/fs/aufs/file.h b/fs/aufs/file.h
--- a/fs/aufs/file.h 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/file.h 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,298 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * file operations
+ */
+
+#ifndef __AUFS_FILE_H__
+#define __AUFS_FILE_H__
+
+#ifdef __KERNEL__
+
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/poll.h>
+#include "rwsem.h"
+
+struct au_branch;
+struct au_hfile {
+ struct file *hf_file;
+ struct au_branch *hf_br;
+};
+
+struct au_vdir;
+struct au_fidir {
+ aufs_bindex_t fd_bbot;
+ aufs_bindex_t fd_nent;
+ struct au_vdir *fd_vdir_cache;
+ struct au_hfile fd_hfile[];
+};
+
+static inline int au_fidir_sz(int nent)
+{
+ AuDebugOn(nent < 0);
+ return sizeof(struct au_fidir) + sizeof(struct au_hfile) * nent;
+}
+
+struct au_finfo {
+ atomic_t fi_generation;
+
+ struct au_rwsem fi_rwsem;
+ aufs_bindex_t fi_btop;
+
+ /* do not union them */
+ struct { /* for non-dir */
+ struct au_hfile fi_htop;
+ atomic_t fi_mmapped;
+ };
+ struct au_fidir *fi_hdir; /* for dir only */
+} ____cacheline_aligned_in_smp;
+
+/* ---------------------------------------------------------------------- */
+
+/* file.c */
+extern const struct address_space_operations aufs_aop;
+unsigned int au_file_roflags(unsigned int flags);
+struct file *au_h_open(struct dentry *dentry, aufs_bindex_t bindex, int flags,
+ struct file *file);
+int au_do_open(struct file *file, int (*open)(struct file *file, int flags),
+ struct au_fidir *fidir);
+int au_reopen_nondir(struct file *file);
+struct au_pin;
+int au_ready_to_write(struct file *file, loff_t len, struct au_pin *pin);
+int au_reval_and_lock_fdi(struct file *file, int (*reopen)(struct file *file),
+ int wlock);
+int au_do_flush(struct file *file, fl_owner_t id,
+ int (*flush)(struct file *file, fl_owner_t id));
+
+/* poll.c */
+#ifdef CONFIG_AUFS_POLL
+unsigned int aufs_poll(struct file *file, poll_table *wait);
+#endif
+
+#ifdef CONFIG_AUFS_BR_HFSPLUS
+/* hfsplus.c */
+struct file *au_h_open_pre(struct dentry *dentry, aufs_bindex_t bindex);
+void au_h_open_post(struct dentry *dentry, aufs_bindex_t bindex,
+ struct file *h_file);
+#else
+static inline
+struct file *au_h_open_pre(struct dentry *dentry, aufs_bindex_t bindex)
+{
+ return NULL;
+}
+
+AuStubVoid(au_h_open_post, struct dentry *dentry, aufs_bindex_t bindex,
+ struct file *h_file);
+#endif
+
+/* f_op.c */
+extern const struct file_operations aufs_file_fop;
+int au_do_open_nondir(struct file *file, int flags);
+int aufs_release_nondir(struct inode *inode __maybe_unused, struct file *file);
+
+#ifdef CONFIG_AUFS_SP_IATTR
+/* f_op_sp.c */
+int au_special_file(umode_t mode);
+void au_init_special_fop(struct inode *inode, umode_t mode, dev_t rdev);
+#else
+AuStubInt0(au_special_file, umode_t mode)
+static inline void au_init_special_fop(struct inode *inode, umode_t mode,
+ dev_t rdev)
+{
+ init_special_inode(inode, mode, rdev);
+}
+#endif
+
+/* finfo.c */
+void au_hfput(struct au_hfile *hf, struct file *file);
+void au_set_h_fptr(struct file *file, aufs_bindex_t bindex,
+ struct file *h_file);
+
+void au_update_figen(struct file *file);
+struct au_fidir *au_fidir_alloc(struct super_block *sb);
+int au_fidir_realloc(struct au_finfo *finfo, int nbr);
+
+void au_fi_init_once(void *_fi);
+void au_finfo_fin(struct file *file);
+int au_finfo_init(struct file *file, struct au_fidir *fidir);
+
+/* ioctl.c */
+long aufs_ioctl_nondir(struct file *file, unsigned int cmd, unsigned long arg);
+#ifdef CONFIG_COMPAT
+long aufs_compat_ioctl_dir(struct file *file, unsigned int cmd,
+ unsigned long arg);
+#endif
+
+/* ---------------------------------------------------------------------- */
+
+static inline struct au_finfo *au_fi(struct file *file)
+{
+ return file->private_data;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * fi_read_lock, fi_write_lock,
+ * fi_read_unlock, fi_write_unlock, fi_downgrade_lock
+ */
+AuSimpleRwsemFuncs(fi, struct file *f, &au_fi(f)->fi_rwsem);
+
+#define FiMustNoWaiters(f) AuRwMustNoWaiters(&au_fi(f)->fi_rwsem)
+#define FiMustAnyLock(f) AuRwMustAnyLock(&au_fi(f)->fi_rwsem)
+#define FiMustWriteLock(f) AuRwMustWriteLock(&au_fi(f)->fi_rwsem)
+
+/* ---------------------------------------------------------------------- */
+
+/* todo: hard/soft set? */
+static inline aufs_bindex_t au_fbstart(struct file *file)
+{
+ FiMustAnyLock(file);
+ return au_fi(file)->fi_btop;
+}
+
+static inline aufs_bindex_t au_fbend_dir(struct file *file)
+{
+ FiMustAnyLock(file);
+ AuDebugOn(!au_fi(file)->fi_hdir);
+ return au_fi(file)->fi_hdir->fd_bbot;
+}
+
+static inline struct au_vdir *au_fvdir_cache(struct file *file)
+{
+ FiMustAnyLock(file);
+ AuDebugOn(!au_fi(file)->fi_hdir);
+ return au_fi(file)->fi_hdir->fd_vdir_cache;
+}
+
+static inline void au_set_fbstart(struct file *file, aufs_bindex_t bindex)
+{
+ FiMustWriteLock(file);
+ au_fi(file)->fi_btop = bindex;
+}
+
+static inline void au_set_fbend_dir(struct file *file, aufs_bindex_t bindex)
+{
+ FiMustWriteLock(file);
+ AuDebugOn(!au_fi(file)->fi_hdir);
+ au_fi(file)->fi_hdir->fd_bbot = bindex;
+}
+
+static inline void au_set_fvdir_cache(struct file *file,
+ struct au_vdir *vdir_cache)
+{
+ FiMustWriteLock(file);
+ AuDebugOn(!au_fi(file)->fi_hdir);
+ au_fi(file)->fi_hdir->fd_vdir_cache = vdir_cache;
+}
+
+static inline struct file *au_hf_top(struct file *file)
+{
+ FiMustAnyLock(file);
+ AuDebugOn(au_fi(file)->fi_hdir);
+ return au_fi(file)->fi_htop.hf_file;
+}
+
+static inline struct file *au_hf_dir(struct file *file, aufs_bindex_t bindex)
+{
+ FiMustAnyLock(file);
+ AuDebugOn(!au_fi(file)->fi_hdir);
+ return au_fi(file)->fi_hdir->fd_hfile[0 + bindex].hf_file;
+}
+
+/* todo: memory barrier? */
+static inline unsigned int au_figen(struct file *f)
+{
+ return atomic_read(&au_fi(f)->fi_generation);
+}
+
+static inline void au_set_mmapped(struct file *f)
+{
+ if (atomic_inc_return(&au_fi(f)->fi_mmapped))
+ return;
+ pr_warning("fi_mmapped wrapped around\n");
+ while (!atomic_inc_return(&au_fi(f)->fi_mmapped))
+ ;
+}
+
+static inline void au_unset_mmapped(struct file *f)
+{
+ atomic_dec(&au_fi(f)->fi_mmapped);
+}
+
+static inline int au_test_mmapped(struct file *f)
+{
+ return atomic_read(&au_fi(f)->fi_mmapped);
+}
+
+/* customize vma->vm_file */
+
+static inline void au_do_vm_file_reset(struct vm_area_struct *vma,
+ struct file *file)
+{
+ struct file *f;
+
+ f = vma->vm_file;
+ get_file(file);
+ vma->vm_file = file;
+ fput(f);
+}
+
+#ifdef CONFIG_MMU
+#define AuDbgVmRegion(file, vma) do {} while (0)
+
+static inline void au_vm_file_reset(struct vm_area_struct *vma,
+ struct file *file)
+{
+ au_do_vm_file_reset(vma, file);
+}
+#else
+#define AuDbgVmRegion(file, vma) \
+ AuDebugOn((vma)->vm_region && (vma)->vm_region->vm_file != (file))
+
+static inline void au_vm_file_reset(struct vm_area_struct *vma,
+ struct file *file)
+{
+ struct file *f;
+
+ au_do_vm_file_reset(vma, file);
+ f = vma->vm_region->vm_file;
+ get_file(file);
+ vma->vm_region->vm_file = file;
+ fput(f);
+}
+#endif /* CONFIG_MMU */
+
+/* handle vma->vm_prfile */
+static inline void au_vm_prfile_set(struct vm_area_struct *vma,
+ struct file *file)
+{
+#ifdef CONFIG_AUFS_PROC_MAP
+ get_file(file);
+ vma->vm_prfile = file;
+#ifndef CONFIG_MMU
+ get_file(file);
+ vma->vm_region->vm_prfile = file;
+#endif
+#endif
+}
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_FILE_H__ */
diff -urN a/fs/aufs/finfo.c b/fs/aufs/finfo.c
--- a/fs/aufs/finfo.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/finfo.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,156 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * file private data
+ */
+
+#include "aufs.h"
+
+void au_hfput(struct au_hfile *hf, struct file *file)
+{
+ /* todo: direct access f_flags */
+ if (vfsub_file_flags(file) & __FMODE_EXEC)
+ allow_write_access(hf->hf_file);
+ fput(hf->hf_file);
+ hf->hf_file = NULL;
+ atomic_dec(&hf->hf_br->br_count);
+ hf->hf_br = NULL;
+}
+
+void au_set_h_fptr(struct file *file, aufs_bindex_t bindex, struct file *val)
+{
+ struct au_finfo *finfo = au_fi(file);
+ struct au_hfile *hf;
+ struct au_fidir *fidir;
+
+ fidir = finfo->fi_hdir;
+ if (!fidir) {
+ AuDebugOn(finfo->fi_btop != bindex);
+ hf = &finfo->fi_htop;
+ } else
+ hf = fidir->fd_hfile + bindex;
+
+ if (hf && hf->hf_file)
+ au_hfput(hf, file);
+ if (val) {
+ FiMustWriteLock(file);
+ hf->hf_file = val;
+ hf->hf_br = au_sbr(file->f_dentry->d_sb, bindex);
+ }
+}
+
+void au_update_figen(struct file *file)
+{
+ atomic_set(&au_fi(file)->fi_generation, au_digen(file->f_dentry));
+ /* smp_mb(); */ /* atomic_set */
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct au_fidir *au_fidir_alloc(struct super_block *sb)
+{
+ struct au_fidir *fidir;
+ int nbr;
+
+ nbr = au_sbend(sb) + 1;
+ if (nbr < 2)
+ nbr = 2; /* initial allocate for 2 branches */
+ fidir = kzalloc(au_fidir_sz(nbr), GFP_NOFS);
+ if (fidir) {
+ fidir->fd_bbot = -1;
+ fidir->fd_nent = nbr;
+ fidir->fd_vdir_cache = NULL;
+ }
+
+ return fidir;
+}
+
+int au_fidir_realloc(struct au_finfo *finfo, int nbr)
+{
+ int err;
+ struct au_fidir *fidir, *p;
+
+ AuRwMustWriteLock(&finfo->fi_rwsem);
+ fidir = finfo->fi_hdir;
+ AuDebugOn(!fidir);
+
+ err = -ENOMEM;
+ p = au_kzrealloc(fidir, au_fidir_sz(fidir->fd_nent), au_fidir_sz(nbr),
+ GFP_NOFS);
+ if (p) {
+ p->fd_nent = nbr;
+ finfo->fi_hdir = p;
+ err = 0;
+ }
+
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+void au_finfo_fin(struct file *file)
+{
+ struct au_finfo *finfo;
+
+ au_nfiles_dec(file->f_dentry->d_sb);
+
+ finfo = au_fi(file);
+ AuDebugOn(finfo->fi_hdir);
+ AuRwDestroy(&finfo->fi_rwsem);
+ au_cache_free_finfo(finfo);
+}
+
+void au_fi_init_once(void *_finfo)
+{
+ struct au_finfo *finfo = _finfo;
+ static struct lock_class_key aufs_fi;
+
+ au_rw_init(&finfo->fi_rwsem);
+ au_rw_class(&finfo->fi_rwsem, &aufs_fi);
+}
+
+int au_finfo_init(struct file *file, struct au_fidir *fidir)
+{
+ int err, lc_idx;
+ struct au_finfo *finfo;
+ struct dentry *dentry;
+
+ err = -ENOMEM;
+ dentry = file->f_dentry;
+ finfo = au_cache_alloc_finfo();
+ if (unlikely(!finfo))
+ goto out;
+
+ err = 0;
+ au_nfiles_inc(dentry->d_sb);
+ lc_idx = AuLcNonDir_FIINFO;
+ if (fidir)
+ lc_idx = AuLcDir_FIINFO;
+ au_rw_class(&finfo->fi_rwsem, au_lc_key + lc_idx);
+ au_rw_write_lock(&finfo->fi_rwsem);
+ finfo->fi_btop = -1;
+ finfo->fi_hdir = fidir;
+ atomic_set(&finfo->fi_generation, au_digen(dentry));
+ /* smp_mb(); */ /* atomic_set */
+
+ file->private_data = finfo;
+
+out:
+ return err;
+}
diff -urN a/fs/aufs/f_op.c b/fs/aufs/f_op.c
--- a/fs/aufs/f_op.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/f_op.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,729 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * file and vm operations
+ */
+
+#include <linux/fs_stack.h>
+#include <linux/mman.h>
+#include <linux/security.h>
+#include "aufs.h"
+
+int au_do_open_nondir(struct file *file, int flags)
+{
+ int err;
+ aufs_bindex_t bindex;
+ struct file *h_file;
+ struct dentry *dentry;
+ struct au_finfo *finfo;
+
+ FiMustWriteLock(file);
+
+ dentry = file->f_dentry;
+ err = au_d_alive(dentry);
+ if (unlikely(err))
+ goto out;
+
+ finfo = au_fi(file);
+ memset(&finfo->fi_htop, 0, sizeof(finfo->fi_htop));
+ atomic_set(&finfo->fi_mmapped, 0);
+ bindex = au_dbstart(dentry);
+ h_file = au_h_open(dentry, bindex, flags, file);
+ if (IS_ERR(h_file))
+ err = PTR_ERR(h_file);
+ else {
+ au_set_fbstart(file, bindex);
+ au_set_h_fptr(file, bindex, h_file);
+ au_update_figen(file);
+ /* todo: necessary? */
+ /* file->f_ra = h_file->f_ra; */
+ }
+
+out:
+ return err;
+}
+
+static int aufs_open_nondir(struct inode *inode __maybe_unused,
+ struct file *file)
+{
+ int err;
+ struct super_block *sb;
+
+ AuDbg("%.*s, f_flags 0x%x, f_mode 0x%x\n",
+ AuDLNPair(file->f_dentry), vfsub_file_flags(file),
+ file->f_mode);
+
+ sb = file->f_dentry->d_sb;
+ si_read_lock(sb, AuLock_FLUSH);
+ err = au_do_open(file, au_do_open_nondir, /*fidir*/NULL);
+ si_read_unlock(sb);
+ return err;
+}
+
+int aufs_release_nondir(struct inode *inode __maybe_unused, struct file *file)
+{
+ struct au_finfo *finfo;
+ aufs_bindex_t bindex;
+
+ finfo = au_fi(file);
+ bindex = finfo->fi_btop;
+ if (bindex >= 0) {
+ /* remove me from sb->s_files */
+ file_sb_list_del(file);
+ au_set_h_fptr(file, bindex, NULL);
+ }
+
+ au_finfo_fin(file);
+ return 0;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int au_do_flush_nondir(struct file *file, fl_owner_t id)
+{
+ int err;
+ struct file *h_file;
+
+ err = 0;
+ h_file = au_hf_top(file);
+ if (h_file)
+ err = vfsub_flush(h_file, id);
+ return err;
+}
+
+static int aufs_flush_nondir(struct file *file, fl_owner_t id)
+{
+ return au_do_flush(file, id, au_do_flush_nondir);
+}
+
+/* ---------------------------------------------------------------------- */
+/*
+ * read and write functions acquire [fdi]_rwsem once, but release before
+ * mmap_sem. This is because to stop a race condition between mmap(2).
+ * Releasing these aufs-rwsem should be safe, no branch-mamagement (by keeping
+ * si_rwsem), no harmful copy-up should happen. Actually copy-up may happen in
+ * read functions after [fdi]_rwsem are released, but it should be harmless.
+ */
+
+static ssize_t aufs_read(struct file *file, char __user *buf, size_t count,
+ loff_t *ppos)
+{
+ ssize_t err;
+ struct dentry *dentry;
+ struct file *h_file;
+ struct super_block *sb;
+
+ dentry = file->f_dentry;
+ sb = dentry->d_sb;
+ si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW);
+ err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/0);
+ if (unlikely(err))
+ goto out;
+
+ h_file = au_hf_top(file);
+ get_file(h_file);
+ di_read_unlock(dentry, AuLock_IR);
+ fi_read_unlock(file);
+
+ /* filedata may be obsoleted by concurrent copyup, but no problem */
+ err = vfsub_read_u(h_file, buf, count, ppos);
+ /* todo: necessary? */
+ /* file->f_ra = h_file->f_ra; */
+ /* update without lock, I don't think it a problem */
+ fsstack_copy_attr_atime(dentry->d_inode, h_file->f_dentry->d_inode);
+ fput(h_file);
+
+out:
+ si_read_unlock(sb);
+ return err;
+}
+
+/*
+ * todo: very ugly
+ * it locks both of i_mutex and si_rwsem for read in safe.
+ * if the plink maintenance mode continues forever (that is the problem),
+ * may loop forever.
+ */
+static void au_mtx_and_read_lock(struct inode *inode)
+{
+ int err;
+ struct super_block *sb = inode->i_sb;
+
+ while (1) {
+ mutex_lock(&inode->i_mutex);
+ err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM);
+ if (!err)
+ break;
+ mutex_unlock(&inode->i_mutex);
+ si_read_lock(sb, AuLock_NOPLMW);
+ si_read_unlock(sb);
+ }
+}
+
+static ssize_t aufs_write(struct file *file, const char __user *ubuf,
+ size_t count, loff_t *ppos)
+{
+ ssize_t err;
+ struct au_pin pin;
+ struct dentry *dentry;
+ struct super_block *sb;
+ struct inode *inode;
+ struct file *h_file;
+ char __user *buf = (char __user *)ubuf;
+
+ dentry = file->f_dentry;
+ sb = dentry->d_sb;
+ inode = dentry->d_inode;
+ au_mtx_and_read_lock(inode);
+
+ err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1);
+ if (unlikely(err))
+ goto out;
+
+ err = au_ready_to_write(file, -1, &pin);
+ di_downgrade_lock(dentry, AuLock_IR);
+ if (unlikely(err)) {
+ di_read_unlock(dentry, AuLock_IR);
+ fi_write_unlock(file);
+ goto out;
+ }
+
+ h_file = au_hf_top(file);
+ get_file(h_file);
+ au_unpin(&pin);
+ di_read_unlock(dentry, AuLock_IR);
+ fi_write_unlock(file);
+
+ err = vfsub_write_u(h_file, buf, count, ppos);
+ ii_write_lock_child(inode);
+ au_cpup_attr_timesizes(inode);
+ inode->i_mode = h_file->f_dentry->d_inode->i_mode;
+ ii_write_unlock(inode);
+ fput(h_file);
+
+out:
+ si_read_unlock(sb);
+ mutex_unlock(&inode->i_mutex);
+ return err;
+}
+
+static ssize_t au_do_aio(struct file *h_file, int rw, struct kiocb *kio,
+ const struct iovec *iov, unsigned long nv, loff_t pos)
+{
+ ssize_t err;
+ struct file *file;
+ ssize_t (*func)(struct kiocb *, const struct iovec *, unsigned long,
+ loff_t);
+
+ err = security_file_permission(h_file, rw);
+ if (unlikely(err))
+ goto out;
+
+ err = -ENOSYS;
+ func = NULL;
+ if (rw == MAY_READ)
+ func = h_file->f_op->aio_read;
+ else if (rw == MAY_WRITE)
+ func = h_file->f_op->aio_write;
+ if (func) {
+ file = kio->ki_filp;
+ kio->ki_filp = h_file;
+ lockdep_off();
+ err = func(kio, iov, nv, pos);
+ lockdep_on();
+ kio->ki_filp = file;
+ } else
+ /* currently there is no such fs */
+ WARN_ON_ONCE(1);
+
+out:
+ return err;
+}
+
+static ssize_t aufs_aio_read(struct kiocb *kio, const struct iovec *iov,
+ unsigned long nv, loff_t pos)
+{
+ ssize_t err;
+ struct file *file, *h_file;
+ struct dentry *dentry;
+ struct super_block *sb;
+
+ file = kio->ki_filp;
+ dentry = file->f_dentry;
+ sb = dentry->d_sb;
+ si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW);
+ err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/0);
+ if (unlikely(err))
+ goto out;
+
+ h_file = au_hf_top(file);
+ get_file(h_file);
+ di_read_unlock(dentry, AuLock_IR);
+ fi_read_unlock(file);
+
+ err = au_do_aio(h_file, MAY_READ, kio, iov, nv, pos);
+ /* todo: necessary? */
+ /* file->f_ra = h_file->f_ra; */
+ /* update without lock, I don't think it a problem */
+ fsstack_copy_attr_atime(dentry->d_inode, h_file->f_dentry->d_inode);
+ fput(h_file);
+
+out:
+ si_read_unlock(sb);
+ return err;
+}
+
+static ssize_t aufs_aio_write(struct kiocb *kio, const struct iovec *iov,
+ unsigned long nv, loff_t pos)
+{
+ ssize_t err;
+ struct au_pin pin;
+ struct dentry *dentry;
+ struct inode *inode;
+ struct file *file, *h_file;
+ struct super_block *sb;
+
+ file = kio->ki_filp;
+ dentry = file->f_dentry;
+ sb = dentry->d_sb;
+ inode = dentry->d_inode;
+ au_mtx_and_read_lock(inode);
+
+ err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1);
+ if (unlikely(err))
+ goto out;
+
+ err = au_ready_to_write(file, -1, &pin);
+ di_downgrade_lock(dentry, AuLock_IR);
+ if (unlikely(err)) {
+ di_read_unlock(dentry, AuLock_IR);
+ fi_write_unlock(file);
+ goto out;
+ }
+
+ h_file = au_hf_top(file);
+ get_file(h_file);
+ au_unpin(&pin);
+ di_read_unlock(dentry, AuLock_IR);
+ fi_write_unlock(file);
+
+ err = au_do_aio(h_file, MAY_WRITE, kio, iov, nv, pos);
+ ii_write_lock_child(inode);
+ au_cpup_attr_timesizes(inode);
+ inode->i_mode = h_file->f_dentry->d_inode->i_mode;
+ ii_write_unlock(inode);
+ fput(h_file);
+
+out:
+ si_read_unlock(sb);
+ mutex_unlock(&inode->i_mutex);
+ return err;
+}
+
+static ssize_t aufs_splice_read(struct file *file, loff_t *ppos,
+ struct pipe_inode_info *pipe, size_t len,
+ unsigned int flags)
+{
+ ssize_t err;
+ struct file *h_file;
+ struct dentry *dentry;
+ struct super_block *sb;
+
+ dentry = file->f_dentry;
+ sb = dentry->d_sb;
+ si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW);
+ err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/0);
+ if (unlikely(err))
+ goto out;
+
+ err = -EINVAL;
+ h_file = au_hf_top(file);
+ get_file(h_file);
+ if (au_test_loopback_kthread()) {
+ au_warn_loopback(h_file->f_dentry->d_sb);
+ if (file->f_mapping != h_file->f_mapping) {
+ file->f_mapping = h_file->f_mapping;
+ smp_mb(); /* unnecessary? */
+ }
+ }
+ di_read_unlock(dentry, AuLock_IR);
+ fi_read_unlock(file);
+
+ err = vfsub_splice_to(h_file, ppos, pipe, len, flags);
+ /* todo: necessasry? */
+ /* file->f_ra = h_file->f_ra; */
+ /* update without lock, I don't think it a problem */
+ fsstack_copy_attr_atime(dentry->d_inode, h_file->f_dentry->d_inode);
+ fput(h_file);
+
+out:
+ si_read_unlock(sb);
+ return err;
+}
+
+static ssize_t
+aufs_splice_write(struct pipe_inode_info *pipe, struct file *file, loff_t *ppos,
+ size_t len, unsigned int flags)
+{
+ ssize_t err;
+ struct au_pin pin;
+ struct dentry *dentry;
+ struct inode *inode;
+ struct file *h_file;
+ struct super_block *sb;
+
+ dentry = file->f_dentry;
+ sb = dentry->d_sb;
+ inode = dentry->d_inode;
+ au_mtx_and_read_lock(inode);
+
+ err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1);
+ if (unlikely(err))
+ goto out;
+
+ err = au_ready_to_write(file, -1, &pin);
+ di_downgrade_lock(dentry, AuLock_IR);
+ if (unlikely(err)) {
+ di_read_unlock(dentry, AuLock_IR);
+ fi_write_unlock(file);
+ goto out;
+ }
+
+ h_file = au_hf_top(file);
+ get_file(h_file);
+ au_unpin(&pin);
+ di_read_unlock(dentry, AuLock_IR);
+ fi_write_unlock(file);
+
+ err = vfsub_splice_from(pipe, h_file, ppos, len, flags);
+ ii_write_lock_child(inode);
+ au_cpup_attr_timesizes(inode);
+ inode->i_mode = h_file->f_dentry->d_inode->i_mode;
+ ii_write_unlock(inode);
+ fput(h_file);
+
+out:
+ si_read_unlock(sb);
+ mutex_unlock(&inode->i_mutex);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * The locking order around current->mmap_sem.
+ * - in most and regular cases
+ * file I/O syscall -- aufs_read() or something
+ * -- si_rwsem for read -- mmap_sem
+ * (Note that [fdi]i_rwsem are released before mmap_sem).
+ * - in mmap case
+ * mmap(2) -- mmap_sem -- aufs_mmap() -- si_rwsem for read -- [fdi]i_rwsem
+ * This AB-BA order is definitly bad, but is not a problem since "si_rwsem for
+ * read" allows muliple processes to acquire it and [fdi]i_rwsem are not held in
+ * file I/O. Aufs needs to stop lockdep in aufs_mmap() though.
+ * It means that when aufs acquires si_rwsem for write, the process should never
+ * acquire mmap_sem.
+ *
+ * Actually aufs_readdir() holds [fdi]i_rwsem before mmap_sem, but this is not a
+ * problem either since any directory is not able to be mmap-ed.
+ * The similar scenario is applied to aufs_readlink() too.
+ */
+
+/* cf. linux/include/linux/mman.h: calc_vm_prot_bits() */
+#define AuConv_VM_PROT(f, b) _calc_vm_trans(f, VM_##b, PROT_##b)
+
+static unsigned long au_arch_prot_conv(unsigned long flags)
+{
+ /* currently ppc64 only */
+#ifdef CONFIG_PPC64
+ /* cf. linux/arch/powerpc/include/asm/mman.h */
+ AuDebugOn(arch_calc_vm_prot_bits(-1) != VM_SAO);
+ return AuConv_VM_PROT(flags, SAO);
+#else
+ AuDebugOn(arch_calc_vm_prot_bits(-1));
+ return 0;
+#endif
+}
+
+static unsigned long au_prot_conv(unsigned long flags)
+{
+ return AuConv_VM_PROT(flags, READ)
+ | AuConv_VM_PROT(flags, WRITE)
+ | AuConv_VM_PROT(flags, EXEC)
+ | au_arch_prot_conv(flags);
+}
+
+/* cf. linux/include/linux/mman.h: calc_vm_flag_bits() */
+#define AuConv_VM_MAP(f, b) _calc_vm_trans(f, VM_##b, MAP_##b)
+
+static unsigned long au_flag_conv(unsigned long flags)
+{
+ return AuConv_VM_MAP(flags, GROWSDOWN)
+ | AuConv_VM_MAP(flags, DENYWRITE)
+ | AuConv_VM_MAP(flags, EXECUTABLE)
+ | AuConv_VM_MAP(flags, LOCKED);
+}
+
+static int aufs_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ int err;
+ unsigned long prot;
+ aufs_bindex_t bstart;
+ const unsigned char wlock
+ = (file->f_mode & FMODE_WRITE) && (vma->vm_flags & VM_SHARED);
+ struct dentry *dentry;
+ struct super_block *sb;
+ struct file *h_file;
+ struct au_branch *br;
+ struct au_pin pin;
+
+ AuDbgVmRegion(file, vma);
+
+ dentry = file->f_dentry;
+ sb = dentry->d_sb;
+ lockdep_off();
+ si_read_lock(sb, AuLock_NOPLMW);
+ err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1);
+ if (unlikely(err))
+ goto out;
+
+ if (wlock) {
+ err = au_ready_to_write(file, -1, &pin);
+ di_write_unlock(dentry);
+ if (unlikely(err)) {
+ fi_write_unlock(file);
+ goto out;
+ }
+ au_unpin(&pin);
+ } else
+ di_write_unlock(dentry);
+
+ bstart = au_fbstart(file);
+ br = au_sbr(sb, bstart);
+ h_file = au_hf_top(file);
+ get_file(h_file);
+ au_set_mmapped(file);
+ fi_write_unlock(file);
+ lockdep_on();
+
+ au_vm_file_reset(vma, h_file);
+ prot = au_prot_conv(vma->vm_flags);
+ err = security_file_mmap(h_file, /*reqprot*/prot, prot,
+ au_flag_conv(vma->vm_flags), vma->vm_start, 0);
+ if (!err)
+ err = h_file->f_op->mmap(h_file, vma);
+ if (unlikely(err))
+ goto out_reset;
+
+ au_vm_prfile_set(vma, file);
+ /* update without lock, I don't think it a problem */
+ fsstack_copy_attr_atime(file->f_dentry->d_inode,
+ h_file->f_dentry->d_inode);
+ goto out_fput; /* success */
+
+out_reset:
+ au_unset_mmapped(file);
+ au_vm_file_reset(vma, file);
+out_fput:
+ fput(h_file);
+ lockdep_off();
+out:
+ si_read_unlock(sb);
+ lockdep_on();
+ AuTraceErr(err);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int aufs_fsync_nondir(struct file *file, loff_t start, loff_t end,
+ int datasync)
+{
+ int err;
+ struct au_pin pin;
+ struct dentry *dentry;
+ struct inode *inode;
+ struct file *h_file;
+ struct super_block *sb;
+
+ dentry = file->f_dentry;
+ inode = dentry->d_inode;
+ sb = dentry->d_sb;
+ mutex_lock(&inode->i_mutex);
+ err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM);
+ if (unlikely(err))
+ goto out;
+
+ err = 0; /* -EBADF; */ /* posix? */
+ if (unlikely(!(file->f_mode & FMODE_WRITE)))
+ goto out_si;
+ err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1);
+ if (unlikely(err))
+ goto out_si;
+
+ err = au_ready_to_write(file, -1, &pin);
+ di_downgrade_lock(dentry, AuLock_IR);
+ if (unlikely(err))
+ goto out_unlock;
+ au_unpin(&pin);
+
+ err = -EINVAL;
+ h_file = au_hf_top(file);
+ err = vfsub_fsync(h_file, &h_file->f_path, datasync);
+ au_cpup_attr_timesizes(inode);
+
+out_unlock:
+ di_read_unlock(dentry, AuLock_IR);
+ fi_write_unlock(file);
+out_si:
+ si_read_unlock(sb);
+out:
+ mutex_unlock(&inode->i_mutex);
+ return err;
+}
+
+/* no one supports this operation, currently */
+#if 0
+static int aufs_aio_fsync_nondir(struct kiocb *kio, int datasync)
+{
+ int err;
+ struct au_pin pin;
+ struct dentry *dentry;
+ struct inode *inode;
+ struct file *file, *h_file;
+
+ file = kio->ki_filp;
+ dentry = file->f_dentry;
+ inode = dentry->d_inode;
+ au_mtx_and_read_lock(inode);
+
+ err = 0; /* -EBADF; */ /* posix? */
+ if (unlikely(!(file->f_mode & FMODE_WRITE)))
+ goto out;
+ err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1);
+ if (unlikely(err))
+ goto out;
+
+ err = au_ready_to_write(file, -1, &pin);
+ di_downgrade_lock(dentry, AuLock_IR);
+ if (unlikely(err))
+ goto out_unlock;
+ au_unpin(&pin);
+
+ err = -ENOSYS;
+ h_file = au_hf_top(file);
+ if (h_file->f_op && h_file->f_op->aio_fsync) {
+ struct dentry *h_d;
+ struct mutex *h_mtx;
+
+ h_d = h_file->f_dentry;
+ h_mtx = &h_d->d_inode->i_mutex;
+ if (!is_sync_kiocb(kio)) {
+ get_file(h_file);
+ fput(file);
+ }
+ kio->ki_filp = h_file;
+ err = h_file->f_op->aio_fsync(kio, datasync);
+ mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
+ if (!err)
+ vfsub_update_h_iattr(&h_file->f_path, /*did*/NULL);
+ /*ignore*/
+ au_cpup_attr_timesizes(inode);
+ mutex_unlock(h_mtx);
+ }
+
+out_unlock:
+ di_read_unlock(dentry, AuLock_IR);
+ fi_write_unlock(file);
+out:
+ si_read_unlock(inode->sb);
+ mutex_unlock(&inode->i_mutex);
+ return err;
+}
+#endif
+
+static int aufs_fasync(int fd, struct file *file, int flag)
+{
+ int err;
+ struct file *h_file;
+ struct dentry *dentry;
+ struct super_block *sb;
+
+ dentry = file->f_dentry;
+ sb = dentry->d_sb;
+ si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW);
+ err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/0);
+ if (unlikely(err))
+ goto out;
+
+ h_file = au_hf_top(file);
+ if (h_file->f_op && h_file->f_op->fasync)
+ err = h_file->f_op->fasync(fd, h_file, flag);
+
+ di_read_unlock(dentry, AuLock_IR);
+ fi_read_unlock(file);
+
+out:
+ si_read_unlock(sb);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* no one supports this operation, currently */
+#if 0
+static ssize_t aufs_sendpage(struct file *file, struct page *page, int offset,
+ size_t len, loff_t *pos , int more)
+{
+}
+#endif
+
+/* ---------------------------------------------------------------------- */
+
+const struct file_operations aufs_file_fop = {
+ .owner = THIS_MODULE,
+
+ .llseek = default_llseek,
+
+ .read = aufs_read,
+ .write = aufs_write,
+ .aio_read = aufs_aio_read,
+ .aio_write = aufs_aio_write,
+#ifdef CONFIG_AUFS_POLL
+ .poll = aufs_poll,
+#endif
+ .unlocked_ioctl = aufs_ioctl_nondir,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = aufs_ioctl_nondir, /* same */
+#endif
+ .mmap = aufs_mmap,
+ .open = aufs_open_nondir,
+ .flush = aufs_flush_nondir,
+ .release = aufs_release_nondir,
+ .fsync = aufs_fsync_nondir,
+ /* .aio_fsync = aufs_aio_fsync_nondir, */
+ .fasync = aufs_fasync,
+ /* .sendpage = aufs_sendpage, */
+ .splice_write = aufs_splice_write,
+ .splice_read = aufs_splice_read,
+#if 0
+ .aio_splice_write = aufs_aio_splice_write,
+ .aio_splice_read = aufs_aio_splice_read
+#endif
+};
diff -urN a/fs/aufs/f_op_sp.c b/fs/aufs/f_op_sp.c
--- a/fs/aufs/f_op_sp.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/f_op_sp.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,298 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * file operations for special files.
+ * while they exist in aufs virtually,
+ * their file I/O is handled out of aufs.
+ */
+
+#include "aufs.h"
+
+static ssize_t aufs_aio_read_sp(struct kiocb *kio, const struct iovec *iov,
+ unsigned long nv, loff_t pos)
+{
+ ssize_t err;
+ aufs_bindex_t bstart;
+ unsigned char wbr;
+ struct file *file, *h_file;
+ struct super_block *sb;
+
+ file = kio->ki_filp;
+ sb = file->f_dentry->d_sb;
+ si_read_lock(sb, AuLock_FLUSH);
+ fi_read_lock(file);
+ bstart = au_fbstart(file);
+ h_file = au_hf_top(file);
+ fi_read_unlock(file);
+ wbr = !!au_br_writable(au_sbr(sb, bstart)->br_perm);
+ si_read_unlock(sb);
+
+ /* do not change the file in kio */
+ AuDebugOn(!h_file->f_op || !h_file->f_op->aio_read);
+ err = h_file->f_op->aio_read(kio, iov, nv, pos);
+ if (err > 0 && wbr)
+ file_accessed(h_file);
+
+ return err;
+}
+
+static ssize_t aufs_aio_write_sp(struct kiocb *kio, const struct iovec *iov,
+ unsigned long nv, loff_t pos)
+{
+ ssize_t err;
+ aufs_bindex_t bstart;
+ unsigned char wbr;
+ struct super_block *sb;
+ struct file *file, *h_file;
+
+ file = kio->ki_filp;
+ sb = file->f_dentry->d_sb;
+ si_read_lock(sb, AuLock_FLUSH);
+ fi_read_lock(file);
+ bstart = au_fbstart(file);
+ h_file = au_hf_top(file);
+ fi_read_unlock(file);
+ wbr = !!au_br_writable(au_sbr(sb, bstart)->br_perm);
+ si_read_unlock(sb);
+
+ /* do not change the file in kio */
+ AuDebugOn(!h_file->f_op || !h_file->f_op->aio_write);
+ err = h_file->f_op->aio_write(kio, iov, nv, pos);
+ if (err > 0 && wbr)
+ file_update_time(h_file);
+
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int aufs_release_sp(struct inode *inode, struct file *file)
+{
+ int err;
+ struct file *h_file;
+
+ fi_read_lock(file);
+ h_file = au_hf_top(file);
+ fi_read_unlock(file);
+ /* close this fifo in aufs */
+ err = h_file->f_op->release(inode, file); /* ignore */
+ aufs_release_nondir(inode, file); /* ignore */
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* currently, support only FIFO */
+enum {
+ AuSp_FIFO, AuSp_FIFO_R, AuSp_FIFO_W, AuSp_FIFO_RW,
+ /* AuSp_SOCK, AuSp_CHR, AuSp_BLK, */
+ AuSp_Last
+};
+static int aufs_open_sp(struct inode *inode, struct file *file);
+static struct au_sp_fop {
+ int done;
+ struct file_operations fop; /* not 'const' */
+ spinlock_t spin;
+} au_sp_fop[AuSp_Last] = {
+ [AuSp_FIFO] = {
+ .fop = {
+ .owner = THIS_MODULE,
+ .open = aufs_open_sp
+ }
+ }
+};
+
+static void au_init_fop_sp(struct file *file)
+{
+ struct au_sp_fop *p;
+ int i;
+ struct file *h_file;
+
+ p = au_sp_fop;
+ if (unlikely(!p->done)) {
+ /* initialize first time only */
+ static DEFINE_SPINLOCK(spin);
+
+ spin_lock(&spin);
+ if (!p->done) {
+ BUILD_BUG_ON(sizeof(au_sp_fop)/sizeof(*au_sp_fop)
+ != AuSp_Last);
+ for (i = 0; i < AuSp_Last; i++)
+ spin_lock_init(&p[i].spin);
+ p->done = 1;
+ }
+ spin_unlock(&spin);
+ }
+
+ switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
+ case FMODE_READ:
+ i = AuSp_FIFO_R;
+ break;
+ case FMODE_WRITE:
+ i = AuSp_FIFO_W;
+ break;
+ case FMODE_READ | FMODE_WRITE:
+ i = AuSp_FIFO_RW;
+ break;
+ default:
+ BUG();
+ }
+
+ p += i;
+ if (unlikely(!p->done)) {
+ /* initialize first time only */
+ h_file = au_hf_top(file);
+ spin_lock(&p->spin);
+ if (!p->done) {
+ p->fop = *h_file->f_op;
+ p->fop.owner = THIS_MODULE;
+ if (p->fop.aio_read)
+ p->fop.aio_read = aufs_aio_read_sp;
+ if (p->fop.aio_write)
+ p->fop.aio_write = aufs_aio_write_sp;
+ p->fop.release = aufs_release_sp;
+ p->done = 1;
+ }
+ spin_unlock(&p->spin);
+ }
+ file->f_op = &p->fop;
+}
+
+static int au_cpup_sp(struct dentry *dentry)
+{
+ int err;
+ aufs_bindex_t bcpup;
+ struct au_pin pin;
+ struct au_wr_dir_args wr_dir_args = {
+ .force_btgt = -1,
+ .flags = 0
+ };
+
+ AuDbg("%.*s\n", AuDLNPair(dentry));
+
+ di_read_unlock(dentry, AuLock_IR);
+ di_write_lock_child(dentry);
+ err = au_wr_dir(dentry, /*src_dentry*/NULL, &wr_dir_args);
+ if (unlikely(err < 0))
+ goto out;
+ bcpup = err;
+ err = 0;
+ if (bcpup == au_dbstart(dentry))
+ goto out; /* success */
+
+ err = au_pin(&pin, dentry, bcpup, au_opt_udba(dentry->d_sb),
+ AuPin_MNT_WRITE);
+ if (!err) {
+ err = au_sio_cpup_simple(dentry, bcpup, -1, AuCpup_DTIME);
+ au_unpin(&pin);
+ }
+
+out:
+ di_downgrade_lock(dentry, AuLock_IR);
+ return err;
+}
+
+static int au_do_open_sp(struct file *file, int flags)
+{
+ int err;
+ struct dentry *dentry;
+ struct super_block *sb;
+ struct file *h_file;
+ struct inode *h_inode;
+
+ dentry = file->f_dentry;
+ AuDbg("%.*s\n", AuDLNPair(dentry));
+
+ /*
+ * try copying-up.
+ * operate on the ro branch is not an error.
+ */
+ au_cpup_sp(dentry); /* ignore */
+
+ /* prepare h_file */
+ err = au_do_open_nondir(file, vfsub_file_flags(file));
+ if (unlikely(err))
+ goto out;
+
+ sb = dentry->d_sb;
+ h_file = au_hf_top(file);
+ h_inode = h_file->f_dentry->d_inode;
+ di_read_unlock(dentry, AuLock_IR);
+ fi_write_unlock(file);
+ si_read_unlock(sb);
+ /* open this fifo in aufs */
+ err = h_inode->i_fop->open(file->f_dentry->d_inode, file);
+ si_noflush_read_lock(sb);
+ fi_write_lock(file);
+ di_read_lock_child(dentry, AuLock_IR);
+ if (!err)
+ au_init_fop_sp(file);
+
+out:
+ return err;
+}
+
+static int aufs_open_sp(struct inode *inode, struct file *file)
+{
+ int err;
+ struct super_block *sb;
+
+ sb = file->f_dentry->d_sb;
+ si_read_lock(sb, AuLock_FLUSH);
+ err = au_do_open(file, au_do_open_sp, /*fidir*/NULL);
+ si_read_unlock(sb);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+void au_init_special_fop(struct inode *inode, umode_t mode, dev_t rdev)
+{
+ init_special_inode(inode, mode, rdev);
+
+ switch (mode & S_IFMT) {
+ case S_IFIFO:
+ inode->i_fop = &au_sp_fop[AuSp_FIFO].fop;
+ /*FALLTHROUGH*/
+ case S_IFCHR:
+ case S_IFBLK:
+ case S_IFSOCK:
+ break;
+ default:
+ AuDebugOn(1);
+ }
+}
+
+int au_special_file(umode_t mode)
+{
+ int ret;
+
+ ret = 0;
+ switch (mode & S_IFMT) {
+ case S_IFIFO:
+#if 0
+ case S_IFCHR:
+ case S_IFBLK:
+ case S_IFSOCK:
+#endif
+ ret = 1;
+ }
+
+ return ret;
+}
diff -urN a/fs/aufs/fstype.h b/fs/aufs/fstype.h
--- a/fs/aufs/fstype.h 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/fstype.h 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,496 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * judging filesystem type
+ */
+
+#ifndef __AUFS_FSTYPE_H__
+#define __AUFS_FSTYPE_H__
+
+#ifdef __KERNEL__
+
+#include <linux/fs.h>
+#include <linux/magic.h>
+#include <linux/romfs_fs.h>
+
+static inline int au_test_aufs(struct super_block *sb)
+{
+ return sb->s_magic == AUFS_SUPER_MAGIC;
+}
+
+static inline const char *au_sbtype(struct super_block *sb)
+{
+ return sb->s_type->name;
+}
+
+static inline int au_test_iso9660(struct super_block *sb __maybe_unused)
+{
+#if defined(CONFIG_ROMFS_FS) || defined(CONFIG_ROMFS_FS_MODULE)
+ return sb->s_magic == ROMFS_MAGIC;
+#else
+ return 0;
+#endif
+}
+
+static inline int au_test_romfs(struct super_block *sb __maybe_unused)
+{
+#if defined(CONFIG_ISO9660_FS) || defined(CONFIG_ISO9660_FS_MODULE)
+ return sb->s_magic == ISOFS_SUPER_MAGIC;
+#else
+ return 0;
+#endif
+}
+
+static inline int au_test_cramfs(struct super_block *sb __maybe_unused)
+{
+#if defined(CONFIG_CRAMFS) || defined(CONFIG_CRAMFS_MODULE)
+ return sb->s_magic == CRAMFS_MAGIC;
+#endif
+ return 0;
+}
+
+static inline int au_test_nfs(struct super_block *sb __maybe_unused)
+{
+#if defined(CONFIG_NFS_FS) || defined(CONFIG_NFS_FS_MODULE)
+ return sb->s_magic == NFS_SUPER_MAGIC;
+#else
+ return 0;
+#endif
+}
+
+static inline int au_test_fuse(struct super_block *sb __maybe_unused)
+{
+#if defined(CONFIG_FUSE_FS) || defined(CONFIG_FUSE_FS_MODULE)
+ return sb->s_magic == FUSE_SUPER_MAGIC;
+#else
+ return 0;
+#endif
+}
+
+static inline int au_test_xfs(struct super_block *sb __maybe_unused)
+{
+#if defined(CONFIG_XFS_FS) || defined(CONFIG_XFS_FS_MODULE)
+ return sb->s_magic == XFS_SB_MAGIC;
+#else
+ return 0;
+#endif
+}
+
+static inline int au_test_tmpfs(struct super_block *sb __maybe_unused)
+{
+#ifdef CONFIG_TMPFS
+ return sb->s_magic == TMPFS_MAGIC;
+#else
+ return 0;
+#endif
+}
+
+static inline int au_test_ecryptfs(struct super_block *sb __maybe_unused)
+{
+#if defined(CONFIG_ECRYPT_FS) || defined(CONFIG_ECRYPT_FS_MODULE)
+ return !strcmp(au_sbtype(sb), "ecryptfs");
+#else
+ return 0;
+#endif
+}
+
+static inline int au_test_smbfs(struct super_block *sb __maybe_unused)
+{
+#if defined(CONFIG_SMB_FS) || defined(CONFIG_SMB_FS_MODULE)
+ return sb->s_magic == SMB_SUPER_MAGIC;
+#else
+ return 0;
+#endif
+}
+
+static inline int au_test_ocfs2(struct super_block *sb __maybe_unused)
+{
+#if defined(CONFIG_OCFS2_FS) || defined(CONFIG_OCFS2_FS_MODULE)
+ return sb->s_magic == OCFS2_SUPER_MAGIC;
+#else
+ return 0;
+#endif
+}
+
+static inline int au_test_ocfs2_dlmfs(struct super_block *sb __maybe_unused)
+{
+#if defined(CONFIG_OCFS2_FS_O2CB) || defined(CONFIG_OCFS2_FS_O2CB_MODULE)
+ return sb->s_magic == DLMFS_MAGIC;
+#else
+ return 0;
+#endif
+}
+
+static inline int au_test_coda(struct super_block *sb __maybe_unused)
+{
+#if defined(CONFIG_CODA_FS) || defined(CONFIG_CODA_FS_MODULE)
+ return sb->s_magic == CODA_SUPER_MAGIC;
+#else
+ return 0;
+#endif
+}
+
+static inline int au_test_v9fs(struct super_block *sb __maybe_unused)
+{
+#if defined(CONFIG_9P_FS) || defined(CONFIG_9P_FS_MODULE)
+ return sb->s_magic == V9FS_MAGIC;
+#else
+ return 0;
+#endif
+}
+
+static inline int au_test_ext4(struct super_block *sb __maybe_unused)
+{
+#if defined(CONFIG_EXT4DEV_FS) || defined(CONFIG_EXT4DEV_FS_MODULE)
+ return sb->s_magic == EXT4_SUPER_MAGIC;
+#else
+ return 0;
+#endif
+}
+
+static inline int au_test_sysv(struct super_block *sb __maybe_unused)
+{
+#if defined(CONFIG_SYSV_FS) || defined(CONFIG_SYSV_FS_MODULE)
+ return !strcmp(au_sbtype(sb), "sysv");
+#else
+ return 0;
+#endif
+}
+
+static inline int au_test_ramfs(struct super_block *sb)
+{
+ return sb->s_magic == RAMFS_MAGIC;
+}
+
+static inline int au_test_ubifs(struct super_block *sb __maybe_unused)
+{
+#if defined(CONFIG_UBIFS_FS) || defined(CONFIG_UBIFS_FS_MODULE)
+ return sb->s_magic == UBIFS_SUPER_MAGIC;
+#else
+ return 0;
+#endif
+}
+
+static inline int au_test_procfs(struct super_block *sb __maybe_unused)
+{
+#ifdef CONFIG_PROC_FS
+ return sb->s_magic == PROC_SUPER_MAGIC;
+#else
+ return 0;
+#endif
+}
+
+static inline int au_test_sysfs(struct super_block *sb __maybe_unused)
+{
+#ifdef CONFIG_SYSFS
+ return sb->s_magic == SYSFS_MAGIC;
+#else
+ return 0;
+#endif
+}
+
+static inline int au_test_configfs(struct super_block *sb __maybe_unused)
+{
+#if defined(CONFIG_CONFIGFS_FS) || defined(CONFIG_CONFIGFS_FS_MODULE)
+ return sb->s_magic == CONFIGFS_MAGIC;
+#else
+ return 0;
+#endif
+}
+
+static inline int au_test_minix(struct super_block *sb __maybe_unused)
+{
+#if defined(CONFIG_MINIX_FS) || defined(CONFIG_MINIX_FS_MODULE)
+ return sb->s_magic == MINIX3_SUPER_MAGIC
+ || sb->s_magic == MINIX2_SUPER_MAGIC
+ || sb->s_magic == MINIX2_SUPER_MAGIC2
+ || sb->s_magic == MINIX_SUPER_MAGIC
+ || sb->s_magic == MINIX_SUPER_MAGIC2;
+#else
+ return 0;
+#endif
+}
+
+static inline int au_test_cifs(struct super_block *sb __maybe_unused)
+{
+#if defined(CONFIG_CIFS_FS) || defined(CONFIGCIFS_FS_MODULE)
+ return sb->s_magic == CIFS_MAGIC_NUMBER;
+#else
+ return 0;
+#endif
+}
+
+static inline int au_test_fat(struct super_block *sb __maybe_unused)
+{
+#if defined(CONFIG_FAT_FS) || defined(CONFIG_FAT_FS_MODULE)
+ return sb->s_magic == MSDOS_SUPER_MAGIC;
+#else
+ return 0;
+#endif
+}
+
+static inline int au_test_msdos(struct super_block *sb)
+{
+ return au_test_fat(sb);
+}
+
+static inline int au_test_vfat(struct super_block *sb)
+{
+ return au_test_fat(sb);
+}
+
+static inline int au_test_securityfs(struct super_block *sb __maybe_unused)
+{
+#ifdef CONFIG_SECURITYFS
+ return sb->s_magic == SECURITYFS_MAGIC;
+#else
+ return 0;
+#endif
+}
+
+static inline int au_test_squashfs(struct super_block *sb __maybe_unused)
+{
+#if defined(CONFIG_SQUASHFS) || defined(CONFIG_SQUASHFS_MODULE)
+ return sb->s_magic == SQUASHFS_MAGIC;
+#else
+ return 0;
+#endif
+}
+
+static inline int au_test_btrfs(struct super_block *sb __maybe_unused)
+{
+#if defined(CONFIG_BTRFS_FS) || defined(CONFIG_BTRFS_FS_MODULE)
+ return sb->s_magic == BTRFS_SUPER_MAGIC;
+#else
+ return 0;
+#endif
+}
+
+static inline int au_test_xenfs(struct super_block *sb __maybe_unused)
+{
+#if defined(CONFIG_XENFS) || defined(CONFIG_XENFS_MODULE)
+ return sb->s_magic == XENFS_SUPER_MAGIC;
+#else
+ return 0;
+#endif
+}
+
+static inline int au_test_debugfs(struct super_block *sb __maybe_unused)
+{
+#ifdef CONFIG_DEBUG_FS
+ return sb->s_magic == DEBUGFS_MAGIC;
+#else
+ return 0;
+#endif
+}
+
+static inline int au_test_nilfs(struct super_block *sb __maybe_unused)
+{
+#if defined(CONFIG_NILFS) || defined(CONFIG_NILFS_MODULE)
+ return sb->s_magic == NILFS_SUPER_MAGIC;
+#else
+ return 0;
+#endif
+}
+
+static inline int au_test_hfsplus(struct super_block *sb __maybe_unused)
+{
+#if defined(CONFIG_HFSPLUS_FS) || defined(CONFIG_HFSPLUS_FS_MODULE)
+ return sb->s_magic == HFSPLUS_SUPER_MAGIC;
+#else
+ return 0;
+#endif
+}
+
+/* ---------------------------------------------------------------------- */
+/*
+ * they can't be an aufs branch.
+ */
+static inline int au_test_fs_unsuppoted(struct super_block *sb)
+{
+ return
+#ifndef CONFIG_AUFS_BR_RAMFS
+ au_test_ramfs(sb) ||
+#endif
+ au_test_procfs(sb)
+ || au_test_sysfs(sb)
+ || au_test_configfs(sb)
+ || au_test_debugfs(sb)
+ || au_test_securityfs(sb)
+ || au_test_xenfs(sb)
+ || au_test_ecryptfs(sb)
+ /* || !strcmp(au_sbtype(sb), "unionfs") */
+ || au_test_aufs(sb); /* will be supported in next version */
+}
+
+/*
+ * If the filesystem supports NFS-export, then it has to support NULL as
+ * a nameidata parameter for ->create(), ->lookup() and ->d_revalidate().
+ * We can apply this principle when we handle a lower filesystem.
+ */
+static inline int au_test_fs_null_nd(struct super_block *sb)
+{
+ return !!sb->s_export_op;
+}
+
+static inline int au_test_fs_remote(struct super_block *sb)
+{
+ return !au_test_tmpfs(sb)
+#ifdef CONFIG_AUFS_BR_RAMFS
+ && !au_test_ramfs(sb)
+#endif
+ && !(sb->s_type->fs_flags & FS_REQUIRES_DEV);
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * Note: these functions (below) are created after reading ->getattr() in all
+ * filesystems under linux/fs. it means we have to do so in every update...
+ */
+
+/*
+ * some filesystems require getattr to refresh the inode attributes before
+ * referencing.
+ * in most cases, we can rely on the inode attribute in NFS (or every remote fs)
+ * and leave the work for d_revalidate()
+ */
+static inline int au_test_fs_refresh_iattr(struct super_block *sb)
+{
+ return au_test_nfs(sb)
+ || au_test_fuse(sb)
+ /* || au_test_smbfs(sb) */ /* untested */
+ /* || au_test_ocfs2(sb) */ /* untested */
+ /* || au_test_btrfs(sb) */ /* untested */
+ /* || au_test_coda(sb) */ /* untested */
+ /* || au_test_v9fs(sb) */ /* untested */
+ ;
+}
+
+/*
+ * filesystems which don't maintain i_size or i_blocks.
+ */
+static inline int au_test_fs_bad_iattr_size(struct super_block *sb)
+{
+ return au_test_xfs(sb)
+ || au_test_btrfs(sb)
+ || au_test_ubifs(sb)
+ || au_test_hfsplus(sb) /* maintained, but incorrect */
+ /* || au_test_ext4(sb) */ /* untested */
+ /* || au_test_ocfs2(sb) */ /* untested */
+ /* || au_test_ocfs2_dlmfs(sb) */ /* untested */
+ /* || au_test_sysv(sb) */ /* untested */
+ /* || au_test_minix(sb) */ /* untested */
+ ;
+}
+
+/*
+ * filesystems which don't store the correct value in some of their inode
+ * attributes.
+ */
+static inline int au_test_fs_bad_iattr(struct super_block *sb)
+{
+ return au_test_fs_bad_iattr_size(sb)
+ /* || au_test_cifs(sb) */ /* untested */
+ || au_test_fat(sb)
+ || au_test_msdos(sb)
+ || au_test_vfat(sb);
+}
+
+/* they don't check i_nlink in link(2) */
+static inline int au_test_fs_no_limit_nlink(struct super_block *sb)
+{
+ return au_test_tmpfs(sb)
+#ifdef CONFIG_AUFS_BR_RAMFS
+ || au_test_ramfs(sb)
+#endif
+ || au_test_ubifs(sb)
+ || au_test_btrfs(sb)
+ || au_test_hfsplus(sb);
+}
+
+/*
+ * filesystems which sets S_NOATIME and S_NOCMTIME.
+ */
+static inline int au_test_fs_notime(struct super_block *sb)
+{
+ return au_test_nfs(sb)
+ || au_test_fuse(sb)
+ || au_test_ubifs(sb)
+ /* || au_test_cifs(sb) */ /* untested */
+ ;
+}
+
+/*
+ * filesystems which requires replacing i_mapping.
+ */
+static inline int au_test_fs_bad_mapping(struct super_block *sb)
+{
+ return au_test_fuse(sb)
+ || au_test_ubifs(sb);
+}
+
+/* temporary support for i#1 in cramfs */
+static inline int au_test_fs_unique_ino(struct inode *inode)
+{
+ if (au_test_cramfs(inode->i_sb))
+ return inode->i_ino != 1;
+ return 1;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * the filesystem where the xino files placed must support i/o after unlink and
+ * maintain i_size and i_blocks.
+ */
+static inline int au_test_fs_bad_xino(struct super_block *sb)
+{
+ return au_test_fs_remote(sb)
+ || au_test_fs_bad_iattr_size(sb)
+#ifdef CONFIG_AUFS_BR_RAMFS
+ || !(au_test_ramfs(sb) || au_test_fs_null_nd(sb))
+#else
+ || !au_test_fs_null_nd(sb) /* to keep xino code simple */
+#endif
+ /* don't want unnecessary work for xino */
+ || au_test_aufs(sb)
+ || au_test_ecryptfs(sb)
+ || au_test_nilfs(sb);
+}
+
+static inline int au_test_fs_trunc_xino(struct super_block *sb)
+{
+ return au_test_tmpfs(sb)
+ || au_test_ramfs(sb);
+}
+
+/*
+ * test if the @sb is real-readonly.
+ */
+static inline int au_test_fs_rr(struct super_block *sb)
+{
+ return au_test_squashfs(sb)
+ || au_test_iso9660(sb)
+ || au_test_cramfs(sb)
+ || au_test_romfs(sb);
+}
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_FSTYPE_H__ */
diff -urN a/fs/aufs/hfsnotify.c b/fs/aufs/hfsnotify.c
--- a/fs/aufs/hfsnotify.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/hfsnotify.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,247 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * fsnotify for the lower directories
+ */
+
+#include "aufs.h"
+
+/* FS_IN_IGNORED is unnecessary */
+static const __u32 AuHfsnMask = (FS_MOVED_TO | FS_MOVED_FROM | FS_DELETE
+ | FS_CREATE | FS_EVENT_ON_CHILD);
+static DECLARE_WAIT_QUEUE_HEAD(au_hfsn_wq);
+
+static void au_hfsn_free_mark(struct fsnotify_mark *mark)
+{
+ struct au_hnotify *hn = container_of(mark, struct au_hnotify,
+ hn_mark);
+ AuDbg("here\n");
+ hn->hn_mark_dead = 1;
+ smp_mb();
+ wake_up_all(&au_hfsn_wq);
+}
+
+static int au_hfsn_alloc(struct au_hinode *hinode)
+{
+ struct au_hnotify *hn;
+ struct super_block *sb;
+ struct au_branch *br;
+ struct fsnotify_mark *mark;
+ aufs_bindex_t bindex;
+
+ hn = hinode->hi_notify;
+ sb = hn->hn_aufs_inode->i_sb;
+ bindex = au_br_index(sb, hinode->hi_id);
+ br = au_sbr(sb, bindex);
+ hn->hn_mark_dead = 0;
+ mark = &hn->hn_mark;
+ fsnotify_init_mark(mark, au_hfsn_free_mark);
+ mark->mask = AuHfsnMask;
+ /*
+ * by udba rename or rmdir, aufs assign a new inode to the known
+ * h_inode, so specify 1 to allow dups.
+ */
+ return fsnotify_add_mark(mark, br->br_hfsn_group, hinode->hi_inode,
+ /*mnt*/NULL, /*allow_dups*/1);
+}
+
+static void au_hfsn_free(struct au_hinode *hinode)
+{
+ struct au_hnotify *hn;
+ struct fsnotify_mark *mark;
+
+ hn = hinode->hi_notify;
+ mark = &hn->hn_mark;
+ fsnotify_destroy_mark(mark);
+ fsnotify_put_mark(mark);
+
+ /* TODO: bad approach */
+ wait_event(au_hfsn_wq, hn->hn_mark_dead);
+}
+
+/* ---------------------------------------------------------------------- */
+
+static void au_hfsn_ctl(struct au_hinode *hinode, int do_set)
+{
+ struct fsnotify_mark *mark;
+
+ mark = &hinode->hi_notify->hn_mark;
+ spin_lock(&mark->lock);
+ if (do_set) {
+ AuDebugOn(mark->mask & AuHfsnMask);
+ mark->mask |= AuHfsnMask;
+ } else {
+ AuDebugOn(!(mark->mask & AuHfsnMask));
+ mark->mask &= ~AuHfsnMask;
+ }
+ spin_unlock(&mark->lock);
+ /* fsnotify_recalc_inode_mask(hinode->hi_inode); */
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* #define AuDbgHnotify */
+#ifdef AuDbgHnotify
+static char *au_hfsn_name(u32 mask)
+{
+#ifdef CONFIG_AUFS_DEBUG
+#define test_ret(flag) if (mask & flag) \
+ return #flag;
+ test_ret(FS_ACCESS);
+ test_ret(FS_MODIFY);
+ test_ret(FS_ATTRIB);
+ test_ret(FS_CLOSE_WRITE);
+ test_ret(FS_CLOSE_NOWRITE);
+ test_ret(FS_OPEN);
+ test_ret(FS_MOVED_FROM);
+ test_ret(FS_MOVED_TO);
+ test_ret(FS_CREATE);
+ test_ret(FS_DELETE);
+ test_ret(FS_DELETE_SELF);
+ test_ret(FS_MOVE_SELF);
+ test_ret(FS_UNMOUNT);
+ test_ret(FS_Q_OVERFLOW);
+ test_ret(FS_IN_IGNORED);
+ test_ret(FS_IN_ISDIR);
+ test_ret(FS_IN_ONESHOT);
+ test_ret(FS_EVENT_ON_CHILD);
+ return "";
+#undef test_ret
+#else
+ return "??";
+#endif
+}
+#endif
+
+/* ---------------------------------------------------------------------- */
+
+static int au_hfsn_handle_event(struct fsnotify_group *group,
+ struct fsnotify_mark *inode_mark,
+ struct fsnotify_mark *vfsmount_mark,
+ struct fsnotify_event *event)
+{
+ int err;
+ struct au_hnotify *hnotify;
+ struct inode *h_dir, *h_inode;
+ __u32 mask;
+ struct qstr h_child_qstr = {
+ .name = event->file_name,
+ .len = event->name_len
+ };
+
+ AuDebugOn(event->data_type != FSNOTIFY_EVENT_INODE);
+
+ err = 0;
+ /* if FS_UNMOUNT happens, there must be another bug */
+ mask = event->mask;
+ AuDebugOn(mask & FS_UNMOUNT);
+ if (mask & (FS_IN_IGNORED | FS_UNMOUNT))
+ goto out;
+
+ h_dir = event->to_tell;
+ h_inode = event->inode;
+#ifdef AuDbgHnotify
+ au_debug(1);
+ if (1 || h_child_qstr.len != sizeof(AUFS_XINO_FNAME) - 1
+ || strncmp(h_child_qstr.name, AUFS_XINO_FNAME, h_child_qstr.len)) {
+ AuDbg("i%lu, mask 0x%x %s, hcname %.*s, hi%lu\n",
+ h_dir->i_ino, mask, au_hfsn_name(mask),
+ AuLNPair(&h_child_qstr), h_inode ? h_inode->i_ino : 0);
+ /* WARN_ON(1); */
+ }
+ au_debug(0);
+#endif
+
+ AuDebugOn(!inode_mark);
+ hnotify = container_of(inode_mark, struct au_hnotify, hn_mark);
+ err = au_hnotify(h_dir, hnotify, mask, &h_child_qstr, h_inode);
+
+out:
+ return err;
+}
+
+/* isn't it waste to ask every registered 'group'? */
+/* copied from linux/fs/notify/inotify/inotify_fsnotiry.c */
+/* it should be exported to modules */
+static bool au_hfsn_should_send_event(struct fsnotify_group *group,
+ struct inode *h_inode,
+ struct fsnotify_mark *inode_mark,
+ struct fsnotify_mark *vfsmount_mark,
+ __u32 mask, void *data, int data_type)
+{
+ mask = (mask & ~FS_EVENT_ON_CHILD);
+ return inode_mark->mask & mask;
+}
+
+static struct fsnotify_ops au_hfsn_ops = {
+ .should_send_event = au_hfsn_should_send_event,
+ .handle_event = au_hfsn_handle_event
+};
+
+/* ---------------------------------------------------------------------- */
+
+static void au_hfsn_fin_br(struct au_branch *br)
+{
+ if (br->br_hfsn_group)
+ fsnotify_put_group(br->br_hfsn_group);
+}
+
+static int au_hfsn_init_br(struct au_branch *br, int perm)
+{
+ br->br_hfsn_group = NULL;
+ br->br_hfsn_ops = au_hfsn_ops;
+ return 0;
+}
+
+static int au_hfsn_reset_br(unsigned int udba, struct au_branch *br, int perm)
+{
+ int err;
+
+ err = 0;
+ if (udba != AuOpt_UDBA_HNOTIFY
+ || !au_br_hnotifyable(perm)) {
+ au_hfsn_fin_br(br);
+ br->br_hfsn_group = NULL;
+ goto out;
+ }
+
+ if (br->br_hfsn_group)
+ goto out;
+
+ br->br_hfsn_group = fsnotify_alloc_group(&br->br_hfsn_ops);
+ if (IS_ERR(br->br_hfsn_group)) {
+ err = PTR_ERR(br->br_hfsn_group);
+ pr_err("fsnotify_alloc_group() failed, %d\n", err);
+ br->br_hfsn_group = NULL;
+ }
+
+out:
+ AuTraceErr(err);
+ return err;
+}
+
+const struct au_hnotify_op au_hnotify_op = {
+ .ctl = au_hfsn_ctl,
+ .alloc = au_hfsn_alloc,
+ .free = au_hfsn_free,
+
+ .reset_br = au_hfsn_reset_br,
+ .fin_br = au_hfsn_fin_br,
+ .init_br = au_hfsn_init_br
+};
diff -urN a/fs/aufs/hfsplus.c b/fs/aufs/hfsplus.c
--- a/fs/aufs/hfsplus.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/hfsplus.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2010-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * special support for filesystems which aqucires an inode mutex
+ * at final closing a file, eg, hfsplus.
+ *
+ * This trick is very simple and stupid, just to open the file before really
+ * neceeary open to tell hfsplus that this is not the final closing.
+ * The caller should call au_h_open_pre() after acquiring the inode mutex,
+ * and au_h_open_post() after releasing it.
+ */
+
+#include "aufs.h"
+
+struct file *au_h_open_pre(struct dentry *dentry, aufs_bindex_t bindex)
+{
+ struct file *h_file;
+ struct dentry *h_dentry;
+
+ h_dentry = au_h_dptr(dentry, bindex);
+ AuDebugOn(!h_dentry);
+ AuDebugOn(!h_dentry->d_inode);
+ IMustLock(h_dentry->d_inode);
+
+ h_file = NULL;
+ if (au_test_hfsplus(h_dentry->d_sb)
+ && S_ISREG(h_dentry->d_inode->i_mode))
+ h_file = au_h_open(dentry, bindex,
+ O_RDONLY | O_NOATIME | O_LARGEFILE,
+ /*file*/NULL);
+ return h_file;
+}
+
+void au_h_open_post(struct dentry *dentry, aufs_bindex_t bindex,
+ struct file *h_file)
+{
+ if (h_file) {
+ fput(h_file);
+ au_sbr_put(dentry->d_sb, bindex);
+ }
+}
diff -urN a/fs/aufs/hnotify.c b/fs/aufs/hnotify.c
--- a/fs/aufs/hnotify.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/hnotify.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,712 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * abstraction to notify the direct changes on lower directories
+ */
+
+#include "aufs.h"
+
+int au_hn_alloc(struct au_hinode *hinode, struct inode *inode)
+{
+ int err;
+ struct au_hnotify *hn;
+
+ err = -ENOMEM;
+ hn = au_cache_alloc_hnotify();
+ if (hn) {
+ hn->hn_aufs_inode = inode;
+ hinode->hi_notify = hn;
+ err = au_hnotify_op.alloc(hinode);
+ AuTraceErr(err);
+ if (unlikely(err)) {
+ hinode->hi_notify = NULL;
+ au_cache_free_hnotify(hn);
+ /*
+ * The upper dir was removed by udba, but the same named
+ * dir left. In this case, aufs assignes a new inode
+ * number and set the monitor again.
+ * For the lower dir, the old monitnor is still left.
+ */
+ if (err == -EEXIST)
+ err = 0;
+ }
+ }
+
+ AuTraceErr(err);
+ return err;
+}
+
+void au_hn_free(struct au_hinode *hinode)
+{
+ struct au_hnotify *hn;
+
+ hn = hinode->hi_notify;
+ if (hn) {
+ au_hnotify_op.free(hinode);
+ au_cache_free_hnotify(hn);
+ hinode->hi_notify = NULL;
+ }
+}
+
+/* ---------------------------------------------------------------------- */
+
+void au_hn_ctl(struct au_hinode *hinode, int do_set)
+{
+ if (hinode->hi_notify)
+ au_hnotify_op.ctl(hinode, do_set);
+}
+
+void au_hn_reset(struct inode *inode, unsigned int flags)
+{
+ aufs_bindex_t bindex, bend;
+ struct inode *hi;
+ struct dentry *iwhdentry;
+
+ bend = au_ibend(inode);
+ for (bindex = au_ibstart(inode); bindex <= bend; bindex++) {
+ hi = au_h_iptr(inode, bindex);
+ if (!hi)
+ continue;
+
+ /* mutex_lock_nested(&hi->i_mutex, AuLsc_I_CHILD); */
+ iwhdentry = au_hi_wh(inode, bindex);
+ if (iwhdentry)
+ dget(iwhdentry);
+ au_igrab(hi);
+ au_set_h_iptr(inode, bindex, NULL, 0);
+ au_set_h_iptr(inode, bindex, au_igrab(hi),
+ flags & ~AuHi_XINO);
+ iput(hi);
+ dput(iwhdentry);
+ /* mutex_unlock(&hi->i_mutex); */
+ }
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int hn_xino(struct inode *inode, struct inode *h_inode)
+{
+ int err;
+ aufs_bindex_t bindex, bend, bfound, bstart;
+ struct inode *h_i;
+
+ err = 0;
+ if (unlikely(inode->i_ino == AUFS_ROOT_INO)) {
+ pr_warning("branch root dir was changed\n");
+ goto out;
+ }
+
+ bfound = -1;
+ bend = au_ibend(inode);
+ bstart = au_ibstart(inode);
+#if 0 /* reserved for future use */
+ if (bindex == bend) {
+ /* keep this ino in rename case */
+ goto out;
+ }
+#endif
+ for (bindex = bstart; bindex <= bend; bindex++)
+ if (au_h_iptr(inode, bindex) == h_inode) {
+ bfound = bindex;
+ break;
+ }
+ if (bfound < 0)
+ goto out;
+
+ for (bindex = bstart; bindex <= bend; bindex++) {
+ h_i = au_h_iptr(inode, bindex);
+ if (!h_i)
+ continue;
+
+ err = au_xino_write(inode->i_sb, bindex, h_i->i_ino, /*ino*/0);
+ /* ignore this error */
+ /* bad action? */
+ }
+
+ /* children inode number will be broken */
+
+out:
+ AuTraceErr(err);
+ return err;
+}
+
+static int hn_gen_tree(struct dentry *dentry)
+{
+ int err, i, j, ndentry;
+ struct au_dcsub_pages dpages;
+ struct au_dpage *dpage;
+ struct dentry **dentries;
+
+ err = au_dpages_init(&dpages, GFP_NOFS);
+ if (unlikely(err))
+ goto out;
+ err = au_dcsub_pages(&dpages, dentry, NULL, NULL);
+ if (unlikely(err))
+ goto out_dpages;
+
+ for (i = 0; i < dpages.ndpage; i++) {
+ dpage = dpages.dpages + i;
+ dentries = dpage->dentries;
+ ndentry = dpage->ndentry;
+ for (j = 0; j < ndentry; j++) {
+ struct dentry *d;
+
+ d = dentries[j];
+ if (IS_ROOT(d))
+ continue;
+
+ au_digen_dec(d);
+ if (d->d_inode)
+ /* todo: reset children xino?
+ cached children only? */
+ au_iigen_dec(d->d_inode);
+ }
+ }
+
+out_dpages:
+ au_dpages_free(&dpages);
+
+#if 0
+ /* discard children */
+ dentry_unhash(dentry);
+ dput(dentry);
+#endif
+out:
+ return err;
+}
+
+/*
+ * return 0 if processed.
+ */
+static int hn_gen_by_inode(char *name, unsigned int nlen, struct inode *inode,
+ const unsigned int isdir)
+{
+ int err;
+ struct dentry *d;
+ struct qstr *dname;
+
+ err = 1;
+ if (unlikely(inode->i_ino == AUFS_ROOT_INO)) {
+ pr_warning("branch root dir was changed\n");
+ err = 0;
+ goto out;
+ }
+
+ if (!isdir) {
+ AuDebugOn(!name);
+ au_iigen_dec(inode);
+ spin_lock(&inode->i_lock);
+ list_for_each_entry(d, &inode->i_dentry, d_alias) {
+ spin_lock(&d->d_lock);
+ dname = &d->d_name;
+ if (dname->len != nlen
+ && memcmp(dname->name, name, nlen)) {
+ spin_unlock(&d->d_lock);
+ continue;
+ }
+ err = 0;
+ au_digen_dec(d);
+ spin_unlock(&d->d_lock);
+ break;
+ }
+ spin_unlock(&inode->i_lock);
+ } else {
+ au_fset_si(au_sbi(inode->i_sb), FAILED_REFRESH_DIR);
+ d = d_find_alias(inode);
+ if (!d) {
+ au_iigen_dec(inode);
+ goto out;
+ }
+
+ spin_lock(&d->d_lock);
+ dname = &d->d_name;
+ if (dname->len == nlen && !memcmp(dname->name, name, nlen)) {
+ spin_unlock(&d->d_lock);
+ err = hn_gen_tree(d);
+ spin_lock(&d->d_lock);
+ }
+ spin_unlock(&d->d_lock);
+ dput(d);
+ }
+
+out:
+ AuTraceErr(err);
+ return err;
+}
+
+static int hn_gen_by_name(struct dentry *dentry, const unsigned int isdir)
+{
+ int err;
+ struct inode *inode;
+
+ inode = dentry->d_inode;
+ if (IS_ROOT(dentry)
+ /* || (inode && inode->i_ino == AUFS_ROOT_INO) */
+ ) {
+ pr_warning("branch root dir was changed\n");
+ return 0;
+ }
+
+ err = 0;
+ if (!isdir) {
+ au_digen_dec(dentry);
+ if (inode)
+ au_iigen_dec(inode);
+ } else {
+ au_fset_si(au_sbi(dentry->d_sb), FAILED_REFRESH_DIR);
+ if (inode)
+ err = hn_gen_tree(dentry);
+ }
+
+ AuTraceErr(err);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* hnotify job flags */
+#define AuHnJob_XINO0 1
+#define AuHnJob_GEN (1 << 1)
+#define AuHnJob_DIRENT (1 << 2)
+#define AuHnJob_ISDIR (1 << 3)
+#define AuHnJob_TRYXINO0 (1 << 4)
+#define AuHnJob_MNTPNT (1 << 5)
+#define au_ftest_hnjob(flags, name) ((flags) & AuHnJob_##name)
+#define au_fset_hnjob(flags, name) \
+ do { (flags) |= AuHnJob_##name; } while (0)
+#define au_fclr_hnjob(flags, name) \
+ do { (flags) &= ~AuHnJob_##name; } while (0)
+
+enum {
+ AuHn_CHILD,
+ AuHn_PARENT,
+ AuHnLast
+};
+
+struct au_hnotify_args {
+ struct inode *h_dir, *dir, *h_child_inode;
+ u32 mask;
+ unsigned int flags[AuHnLast];
+ unsigned int h_child_nlen;
+ char h_child_name[];
+};
+
+struct hn_job_args {
+ unsigned int flags;
+ struct inode *inode, *h_inode, *dir, *h_dir;
+ struct dentry *dentry;
+ char *h_name;
+ int h_nlen;
+};
+
+static int hn_job(struct hn_job_args *a)
+{
+ const unsigned int isdir = au_ftest_hnjob(a->flags, ISDIR);
+
+ /* reset xino */
+ if (au_ftest_hnjob(a->flags, XINO0) && a->inode)
+ hn_xino(a->inode, a->h_inode); /* ignore this error */
+
+ if (au_ftest_hnjob(a->flags, TRYXINO0)
+ && a->inode
+ && a->h_inode) {
+ mutex_lock_nested(&a->h_inode->i_mutex, AuLsc_I_CHILD);
+ if (!a->h_inode->i_nlink)
+ hn_xino(a->inode, a->h_inode); /* ignore this error */
+ mutex_unlock(&a->h_inode->i_mutex);
+ }
+
+ /* make the generation obsolete */
+ if (au_ftest_hnjob(a->flags, GEN)) {
+ int err = -1;
+ if (a->inode)
+ err = hn_gen_by_inode(a->h_name, a->h_nlen, a->inode,
+ isdir);
+ if (err && a->dentry)
+ hn_gen_by_name(a->dentry, isdir);
+ /* ignore this error */
+ }
+
+ /* make dir entries obsolete */
+ if (au_ftest_hnjob(a->flags, DIRENT) && a->inode) {
+ struct au_vdir *vdir;
+
+ vdir = au_ivdir(a->inode);
+ if (vdir)
+ vdir->vd_jiffy = 0;
+ /* IMustLock(a->inode); */
+ /* a->inode->i_version++; */
+ }
+
+ /* can do nothing but warn */
+ if (au_ftest_hnjob(a->flags, MNTPNT)
+ && a->dentry
+ && d_mountpoint(a->dentry))
+ pr_warning("mount-point %.*s is removed or renamed\n",
+ AuDLNPair(a->dentry));
+
+ return 0;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static struct dentry *lookup_wlock_by_name(char *name, unsigned int nlen,
+ struct inode *dir)
+{
+ struct dentry *dentry, *d, *parent;
+ struct qstr *dname;
+
+ parent = d_find_alias(dir);
+ if (!parent)
+ return NULL;
+
+ dentry = NULL;
+ spin_lock(&parent->d_lock);
+ list_for_each_entry(d, &parent->d_subdirs, d_u.d_child) {
+ /* AuDbg("%.*s\n", AuDLNPair(d)); */
+ spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED);
+ dname = &d->d_name;
+ if (dname->len != nlen || memcmp(dname->name, name, nlen))
+ goto cont_unlock;
+ if (au_di(d))
+ au_digen_dec(d);
+ else
+ goto cont_unlock;
+ if (d->d_count) {
+ dentry = dget_dlock(d);
+ spin_unlock(&d->d_lock);
+ break;
+ }
+
+ cont_unlock:
+ spin_unlock(&d->d_lock);
+ }
+ spin_unlock(&parent->d_lock);
+ dput(parent);
+
+ if (dentry)
+ di_write_lock_child(dentry);
+
+ return dentry;
+}
+
+static struct inode *lookup_wlock_by_ino(struct super_block *sb,
+ aufs_bindex_t bindex, ino_t h_ino)
+{
+ struct inode *inode;
+ ino_t ino;
+ int err;
+
+ inode = NULL;
+ err = au_xino_read(sb, bindex, h_ino, &ino);
+ if (!err && ino)
+ inode = ilookup(sb, ino);
+ if (!inode)
+ goto out;
+
+ if (unlikely(inode->i_ino == AUFS_ROOT_INO)) {
+ pr_warning("wrong root branch\n");
+ iput(inode);
+ inode = NULL;
+ goto out;
+ }
+
+ ii_write_lock_child(inode);
+
+out:
+ return inode;
+}
+
+static void au_hn_bh(void *_args)
+{
+ struct au_hnotify_args *a = _args;
+ struct super_block *sb;
+ aufs_bindex_t bindex, bend, bfound;
+ unsigned char xino, try_iput;
+ int err;
+ struct inode *inode;
+ ino_t h_ino;
+ struct hn_job_args args;
+ struct dentry *dentry;
+ struct au_sbinfo *sbinfo;
+
+ AuDebugOn(!_args);
+ AuDebugOn(!a->h_dir);
+ AuDebugOn(!a->dir);
+ AuDebugOn(!a->mask);
+ AuDbg("mask 0x%x, i%lu, hi%lu, hci%lu\n",
+ a->mask, a->dir->i_ino, a->h_dir->i_ino,
+ a->h_child_inode ? a->h_child_inode->i_ino : 0);
+
+ inode = NULL;
+ dentry = NULL;
+ /*
+ * do not lock a->dir->i_mutex here
+ * because of d_revalidate() may cause a deadlock.
+ */
+ sb = a->dir->i_sb;
+ AuDebugOn(!sb);
+ sbinfo = au_sbi(sb);
+ AuDebugOn(!sbinfo);
+ si_write_lock(sb, AuLock_NOPLMW);
+
+ ii_read_lock_parent(a->dir);
+ bfound = -1;
+ bend = au_ibend(a->dir);
+ for (bindex = au_ibstart(a->dir); bindex <= bend; bindex++)
+ if (au_h_iptr(a->dir, bindex) == a->h_dir) {
+ bfound = bindex;
+ break;
+ }
+ ii_read_unlock(a->dir);
+ if (unlikely(bfound < 0))
+ goto out;
+
+ xino = !!au_opt_test(au_mntflags(sb), XINO);
+ h_ino = 0;
+ if (a->h_child_inode)
+ h_ino = a->h_child_inode->i_ino;
+
+ if (a->h_child_nlen
+ && (au_ftest_hnjob(a->flags[AuHn_CHILD], GEN)
+ || au_ftest_hnjob(a->flags[AuHn_CHILD], MNTPNT)))
+ dentry = lookup_wlock_by_name(a->h_child_name, a->h_child_nlen,
+ a->dir);
+ try_iput = 0;
+ if (dentry)
+ inode = dentry->d_inode;
+ if (xino && !inode && h_ino
+ && (au_ftest_hnjob(a->flags[AuHn_CHILD], XINO0)
+ || au_ftest_hnjob(a->flags[AuHn_CHILD], TRYXINO0)
+ || au_ftest_hnjob(a->flags[AuHn_CHILD], GEN))) {
+ inode = lookup_wlock_by_ino(sb, bfound, h_ino);
+ try_iput = 1;
+ }
+
+ args.flags = a->flags[AuHn_CHILD];
+ args.dentry = dentry;
+ args.inode = inode;
+ args.h_inode = a->h_child_inode;
+ args.dir = a->dir;
+ args.h_dir = a->h_dir;
+ args.h_name = a->h_child_name;
+ args.h_nlen = a->h_child_nlen;
+ err = hn_job(&args);
+ if (dentry) {
+ if (au_di(dentry))
+ di_write_unlock(dentry);
+ dput(dentry);
+ }
+ if (inode && try_iput) {
+ ii_write_unlock(inode);
+ iput(inode);
+ }
+
+ ii_write_lock_parent(a->dir);
+ args.flags = a->flags[AuHn_PARENT];
+ args.dentry = NULL;
+ args.inode = a->dir;
+ args.h_inode = a->h_dir;
+ args.dir = NULL;
+ args.h_dir = NULL;
+ args.h_name = NULL;
+ args.h_nlen = 0;
+ err = hn_job(&args);
+ ii_write_unlock(a->dir);
+
+out:
+ iput(a->h_child_inode);
+ iput(a->h_dir);
+ iput(a->dir);
+ si_write_unlock(sb);
+ au_nwt_done(&sbinfo->si_nowait);
+ kfree(a);
+}
+
+/* ---------------------------------------------------------------------- */
+
+int au_hnotify(struct inode *h_dir, struct au_hnotify *hnotify, u32 mask,
+ struct qstr *h_child_qstr, struct inode *h_child_inode)
+{
+ int err, len;
+ unsigned int flags[AuHnLast], f;
+ unsigned char isdir, isroot, wh;
+ struct inode *dir;
+ struct au_hnotify_args *args;
+ char *p, *h_child_name;
+
+ err = 0;
+ AuDebugOn(!hnotify || !hnotify->hn_aufs_inode);
+ dir = igrab(hnotify->hn_aufs_inode);
+ if (!dir)
+ goto out;
+
+ isroot = (dir->i_ino == AUFS_ROOT_INO);
+ wh = 0;
+ h_child_name = (void *)h_child_qstr->name;
+ len = h_child_qstr->len;
+ if (h_child_name) {
+ if (len > AUFS_WH_PFX_LEN
+ && !memcmp(h_child_name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) {
+ h_child_name += AUFS_WH_PFX_LEN;
+ len -= AUFS_WH_PFX_LEN;
+ wh = 1;
+ }
+ }
+
+ isdir = 0;
+ if (h_child_inode)
+ isdir = !!S_ISDIR(h_child_inode->i_mode);
+ flags[AuHn_PARENT] = AuHnJob_ISDIR;
+ flags[AuHn_CHILD] = 0;
+ if (isdir)
+ flags[AuHn_CHILD] = AuHnJob_ISDIR;
+ au_fset_hnjob(flags[AuHn_PARENT], DIRENT);
+ au_fset_hnjob(flags[AuHn_CHILD], GEN);
+ switch (mask & FS_EVENTS_POSS_ON_CHILD) {
+ case FS_MOVED_FROM:
+ case FS_MOVED_TO:
+ au_fset_hnjob(flags[AuHn_CHILD], XINO0);
+ au_fset_hnjob(flags[AuHn_CHILD], MNTPNT);
+ /*FALLTHROUGH*/
+ case FS_CREATE:
+ AuDebugOn(!h_child_name || !h_child_inode);
+ break;
+
+ case FS_DELETE:
+ /*
+ * aufs never be able to get this child inode.
+ * revalidation should be in d_revalidate()
+ * by checking i_nlink, i_generation or d_unhashed().
+ */
+ AuDebugOn(!h_child_name);
+ au_fset_hnjob(flags[AuHn_CHILD], TRYXINO0);
+ au_fset_hnjob(flags[AuHn_CHILD], MNTPNT);
+ break;
+
+ default:
+ AuDebugOn(1);
+ }
+
+ if (wh)
+ h_child_inode = NULL;
+
+ err = -ENOMEM;
+ /* iput() and kfree() will be called in au_hnotify() */
+ args = kmalloc(sizeof(*args) + len + 1, GFP_NOFS);
+ if (unlikely(!args)) {
+ AuErr1("no memory\n");
+ iput(dir);
+ goto out;
+ }
+ args->flags[AuHn_PARENT] = flags[AuHn_PARENT];
+ args->flags[AuHn_CHILD] = flags[AuHn_CHILD];
+ args->mask = mask;
+ args->dir = dir;
+ args->h_dir = igrab(h_dir);
+ if (h_child_inode)
+ h_child_inode = igrab(h_child_inode); /* can be NULL */
+ args->h_child_inode = h_child_inode;
+ args->h_child_nlen = len;
+ if (len) {
+ p = (void *)args;
+ p += sizeof(*args);
+ memcpy(p, h_child_name, len);
+ p[len] = 0;
+ }
+
+ f = 0;
+ if (!dir->i_nlink)
+ f = AuWkq_NEST;
+ err = au_wkq_nowait(au_hn_bh, args, dir->i_sb, f);
+ if (unlikely(err)) {
+ pr_err("wkq %d\n", err);
+ iput(args->h_child_inode);
+ iput(args->h_dir);
+ iput(args->dir);
+ kfree(args);
+ }
+
+out:
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+int au_hnotify_reset_br(unsigned int udba, struct au_branch *br, int perm)
+{
+ int err;
+
+ AuDebugOn(!(udba & AuOptMask_UDBA));
+
+ err = 0;
+ if (au_hnotify_op.reset_br)
+ err = au_hnotify_op.reset_br(udba, br, perm);
+
+ return err;
+}
+
+int au_hnotify_init_br(struct au_branch *br, int perm)
+{
+ int err;
+
+ err = 0;
+ if (au_hnotify_op.init_br)
+ err = au_hnotify_op.init_br(br, perm);
+
+ return err;
+}
+
+void au_hnotify_fin_br(struct au_branch *br)
+{
+ if (au_hnotify_op.fin_br)
+ au_hnotify_op.fin_br(br);
+}
+
+static void au_hn_destroy_cache(void)
+{
+ kmem_cache_destroy(au_cachep[AuCache_HNOTIFY]);
+ au_cachep[AuCache_HNOTIFY] = NULL;
+}
+
+int __init au_hnotify_init(void)
+{
+ int err;
+
+ err = -ENOMEM;
+ au_cachep[AuCache_HNOTIFY] = AuCache(au_hnotify);
+ if (au_cachep[AuCache_HNOTIFY]) {
+ err = 0;
+ if (au_hnotify_op.init)
+ err = au_hnotify_op.init();
+ if (unlikely(err))
+ au_hn_destroy_cache();
+ }
+ AuTraceErr(err);
+ return err;
+}
+
+void au_hnotify_fin(void)
+{
+ if (au_hnotify_op.fin)
+ au_hnotify_op.fin();
+ /* cf. au_cache_fin() */
+ if (au_cachep[AuCache_HNOTIFY])
+ au_hn_destroy_cache();
+}
diff -urN a/fs/aufs/iinfo.c b/fs/aufs/iinfo.c
--- a/fs/aufs/iinfo.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/iinfo.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,264 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * inode private data
+ */
+
+#include "aufs.h"
+
+struct inode *au_h_iptr(struct inode *inode, aufs_bindex_t bindex)
+{
+ struct inode *h_inode;
+
+ IiMustAnyLock(inode);
+
+ h_inode = au_ii(inode)->ii_hinode[0 + bindex].hi_inode;
+ AuDebugOn(h_inode && atomic_read(&h_inode->i_count) <= 0);
+ return h_inode;
+}
+
+/* todo: hard/soft set? */
+void au_hiput(struct au_hinode *hinode)
+{
+ au_hn_free(hinode);
+ dput(hinode->hi_whdentry);
+ iput(hinode->hi_inode);
+}
+
+unsigned int au_hi_flags(struct inode *inode, int isdir)
+{
+ unsigned int flags;
+ const unsigned int mnt_flags = au_mntflags(inode->i_sb);
+
+ flags = 0;
+ if (au_opt_test(mnt_flags, XINO))
+ au_fset_hi(flags, XINO);
+ if (isdir && au_opt_test(mnt_flags, UDBA_HNOTIFY))
+ au_fset_hi(flags, HNOTIFY);
+ return flags;
+}
+
+void au_set_h_iptr(struct inode *inode, aufs_bindex_t bindex,
+ struct inode *h_inode, unsigned int flags)
+{
+ struct au_hinode *hinode;
+ struct inode *hi;
+ struct au_iinfo *iinfo = au_ii(inode);
+
+ IiMustWriteLock(inode);
+
+ hinode = iinfo->ii_hinode + bindex;
+ hi = hinode->hi_inode;
+ AuDebugOn(h_inode && atomic_read(&h_inode->i_count) <= 0);
+
+ if (hi)
+ au_hiput(hinode);
+ hinode->hi_inode = h_inode;
+ if (h_inode) {
+ int err;
+ struct super_block *sb = inode->i_sb;
+ struct au_branch *br;
+
+ AuDebugOn(inode->i_mode
+ && (h_inode->i_mode & S_IFMT)
+ != (inode->i_mode & S_IFMT));
+ if (bindex == iinfo->ii_bstart)
+ au_cpup_igen(inode, h_inode);
+ br = au_sbr(sb, bindex);
+ hinode->hi_id = br->br_id;
+ if (au_ftest_hi(flags, XINO)) {
+ err = au_xino_write(sb, bindex, h_inode->i_ino,
+ inode->i_ino);
+ if (unlikely(err))
+ AuIOErr1("failed au_xino_write() %d\n", err);
+ }
+
+ if (au_ftest_hi(flags, HNOTIFY)
+ && au_br_hnotifyable(br->br_perm)) {
+ err = au_hn_alloc(hinode, inode);
+ if (unlikely(err))
+ AuIOErr1("au_hn_alloc() %d\n", err);
+ }
+ }
+}
+
+void au_set_hi_wh(struct inode *inode, aufs_bindex_t bindex,
+ struct dentry *h_wh)
+{
+ struct au_hinode *hinode;
+
+ IiMustWriteLock(inode);
+
+ hinode = au_ii(inode)->ii_hinode + bindex;
+ AuDebugOn(hinode->hi_whdentry);
+ hinode->hi_whdentry = h_wh;
+}
+
+void au_update_iigen(struct inode *inode)
+{
+ atomic_set(&au_ii(inode)->ii_generation, au_sigen(inode->i_sb));
+ /* smp_mb(); */ /* atomic_set */
+}
+
+/* it may be called at remount time, too */
+void au_update_ibrange(struct inode *inode, int do_put_zero)
+{
+ struct au_iinfo *iinfo;
+ aufs_bindex_t bindex, bend;
+
+ iinfo = au_ii(inode);
+ if (!iinfo)
+ return;
+
+ IiMustWriteLock(inode);
+
+ if (do_put_zero && iinfo->ii_bstart >= 0) {
+ for (bindex = iinfo->ii_bstart; bindex <= iinfo->ii_bend;
+ bindex++) {
+ struct inode *h_i;
+
+ h_i = iinfo->ii_hinode[0 + bindex].hi_inode;
+ if (h_i && !h_i->i_nlink)
+ au_set_h_iptr(inode, bindex, NULL, 0);
+ }
+ }
+
+ iinfo->ii_bstart = -1;
+ iinfo->ii_bend = -1;
+ bend = au_sbend(inode->i_sb);
+ for (bindex = 0; bindex <= bend; bindex++)
+ if (iinfo->ii_hinode[0 + bindex].hi_inode) {
+ iinfo->ii_bstart = bindex;
+ break;
+ }
+ if (iinfo->ii_bstart >= 0)
+ for (bindex = bend; bindex >= iinfo->ii_bstart; bindex--)
+ if (iinfo->ii_hinode[0 + bindex].hi_inode) {
+ iinfo->ii_bend = bindex;
+ break;
+ }
+ AuDebugOn(iinfo->ii_bstart > iinfo->ii_bend);
+}
+
+/* ---------------------------------------------------------------------- */
+
+void au_icntnr_init_once(void *_c)
+{
+ struct au_icntnr *c = _c;
+ struct au_iinfo *iinfo = &c->iinfo;
+ static struct lock_class_key aufs_ii;
+
+ au_rw_init(&iinfo->ii_rwsem);
+ au_rw_class(&iinfo->ii_rwsem, &aufs_ii);
+ inode_init_once(&c->vfs_inode);
+}
+
+int au_iinfo_init(struct inode *inode)
+{
+ struct au_iinfo *iinfo;
+ struct super_block *sb;
+ int nbr, i;
+
+ sb = inode->i_sb;
+ iinfo = &(container_of(inode, struct au_icntnr, vfs_inode)->iinfo);
+ nbr = au_sbend(sb) + 1;
+ if (unlikely(nbr <= 0))
+ nbr = 1;
+ iinfo->ii_hinode = kcalloc(nbr, sizeof(*iinfo->ii_hinode), GFP_NOFS);
+ if (iinfo->ii_hinode) {
+ au_ninodes_inc(sb);
+ for (i = 0; i < nbr; i++)
+ iinfo->ii_hinode[i].hi_id = -1;
+
+ atomic_set(&iinfo->ii_generation, au_sigen(sb));
+ /* smp_mb(); */ /* atomic_set */
+ iinfo->ii_bstart = -1;
+ iinfo->ii_bend = -1;
+ iinfo->ii_vdir = NULL;
+ return 0;
+ }
+ return -ENOMEM;
+}
+
+int au_ii_realloc(struct au_iinfo *iinfo, int nbr)
+{
+ int err, sz;
+ struct au_hinode *hip;
+
+ AuRwMustWriteLock(&iinfo->ii_rwsem);
+
+ err = -ENOMEM;
+ sz = sizeof(*hip) * (iinfo->ii_bend + 1);
+ if (!sz)
+ sz = sizeof(*hip);
+ hip = au_kzrealloc(iinfo->ii_hinode, sz, sizeof(*hip) * nbr, GFP_NOFS);
+ if (hip) {
+ iinfo->ii_hinode = hip;
+ err = 0;
+ }
+
+ return err;
+}
+
+void au_iinfo_fin(struct inode *inode)
+{
+ struct au_iinfo *iinfo;
+ struct au_hinode *hi;
+ struct super_block *sb;
+ aufs_bindex_t bindex, bend;
+ const unsigned char unlinked = !inode->i_nlink;
+
+ iinfo = au_ii(inode);
+ /* bad_inode case */
+ if (!iinfo)
+ return;
+
+ sb = inode->i_sb;
+ au_ninodes_dec(sb);
+ if (si_pid_test(sb))
+ au_xino_delete_inode(inode, unlinked);
+ else {
+ /*
+ * it is safe to hide the dependency between sbinfo and
+ * sb->s_umount.
+ */
+ lockdep_off();
+ si_noflush_read_lock(sb);
+ au_xino_delete_inode(inode, unlinked);
+ si_read_unlock(sb);
+ lockdep_on();
+ }
+
+ if (iinfo->ii_vdir)
+ au_vdir_free(iinfo->ii_vdir);
+
+ bindex = iinfo->ii_bstart;
+ if (bindex >= 0) {
+ hi = iinfo->ii_hinode + bindex;
+ bend = iinfo->ii_bend;
+ while (bindex++ <= bend) {
+ if (hi->hi_inode)
+ au_hiput(hi);
+ hi++;
+ }
+ }
+ kfree(iinfo->ii_hinode);
+ iinfo->ii_hinode = NULL;
+ AuRwDestroy(&iinfo->ii_rwsem);
+}
diff -urN a/fs/aufs/inode.c b/fs/aufs/inode.c
--- a/fs/aufs/inode.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/inode.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,471 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * inode functions
+ */
+
+#include "aufs.h"
+
+struct inode *au_igrab(struct inode *inode)
+{
+ if (inode) {
+ AuDebugOn(!atomic_read(&inode->i_count));
+ ihold(inode);
+ }
+ return inode;
+}
+
+static void au_refresh_hinode_attr(struct inode *inode, int do_version)
+{
+ au_cpup_attr_all(inode, /*force*/0);
+ au_update_iigen(inode);
+ if (do_version)
+ inode->i_version++;
+}
+
+static int au_ii_refresh(struct inode *inode, int *update)
+{
+ int err, e;
+ umode_t type;
+ aufs_bindex_t bindex, new_bindex;
+ struct super_block *sb;
+ struct au_iinfo *iinfo;
+ struct au_hinode *p, *q, tmp;
+
+ IiMustWriteLock(inode);
+
+ *update = 0;
+ sb = inode->i_sb;
+ type = inode->i_mode & S_IFMT;
+ iinfo = au_ii(inode);
+ err = au_ii_realloc(iinfo, au_sbend(sb) + 1);
+ if (unlikely(err))
+ goto out;
+
+ AuDebugOn(iinfo->ii_bstart < 0);
+ p = iinfo->ii_hinode + iinfo->ii_bstart;
+ for (bindex = iinfo->ii_bstart; bindex <= iinfo->ii_bend;
+ bindex++, p++) {
+ if (!p->hi_inode)
+ continue;
+
+ AuDebugOn(type != (p->hi_inode->i_mode & S_IFMT));
+ new_bindex = au_br_index(sb, p->hi_id);
+ if (new_bindex == bindex)
+ continue;
+
+ if (new_bindex < 0) {
+ *update = 1;
+ au_hiput(p);
+ p->hi_inode = NULL;
+ continue;
+ }
+
+ if (new_bindex < iinfo->ii_bstart)
+ iinfo->ii_bstart = new_bindex;
+ if (iinfo->ii_bend < new_bindex)
+ iinfo->ii_bend = new_bindex;
+ /* swap two lower inode, and loop again */
+ q = iinfo->ii_hinode + new_bindex;
+ tmp = *q;
+ *q = *p;
+ *p = tmp;
+ if (tmp.hi_inode) {
+ bindex--;
+ p--;
+ }
+ }
+ au_update_ibrange(inode, /*do_put_zero*/0);
+ e = au_dy_irefresh(inode);
+ if (unlikely(e && !err))
+ err = e;
+
+out:
+ AuTraceErr(err);
+ return err;
+}
+
+int au_refresh_hinode_self(struct inode *inode)
+{
+ int err, update;
+
+ err = au_ii_refresh(inode, &update);
+ if (!err)
+ au_refresh_hinode_attr(inode, update && S_ISDIR(inode->i_mode));
+
+ AuTraceErr(err);
+ return err;
+}
+
+int au_refresh_hinode(struct inode *inode, struct dentry *dentry)
+{
+ int err, e, update;
+ unsigned int flags;
+ umode_t mode;
+ aufs_bindex_t bindex, bend;
+ unsigned char isdir;
+ struct au_hinode *p;
+ struct au_iinfo *iinfo;
+
+ err = au_ii_refresh(inode, &update);
+ if (unlikely(err))
+ goto out;
+
+ update = 0;
+ iinfo = au_ii(inode);
+ p = iinfo->ii_hinode + iinfo->ii_bstart;
+ mode = (inode->i_mode & S_IFMT);
+ isdir = S_ISDIR(mode);
+ flags = au_hi_flags(inode, isdir);
+ bend = au_dbend(dentry);
+ for (bindex = au_dbstart(dentry); bindex <= bend; bindex++) {
+ struct inode *h_i;
+ struct dentry *h_d;
+
+ h_d = au_h_dptr(dentry, bindex);
+ if (!h_d || !h_d->d_inode)
+ continue;
+
+ AuDebugOn(mode != (h_d->d_inode->i_mode & S_IFMT));
+ if (iinfo->ii_bstart <= bindex && bindex <= iinfo->ii_bend) {
+ h_i = au_h_iptr(inode, bindex);
+ if (h_i) {
+ if (h_i == h_d->d_inode)
+ continue;
+ err = -EIO;
+ break;
+ }
+ }
+ if (bindex < iinfo->ii_bstart)
+ iinfo->ii_bstart = bindex;
+ if (iinfo->ii_bend < bindex)
+ iinfo->ii_bend = bindex;
+ au_set_h_iptr(inode, bindex, au_igrab(h_d->d_inode), flags);
+ update = 1;
+ }
+ au_update_ibrange(inode, /*do_put_zero*/0);
+ e = au_dy_irefresh(inode);
+ if (unlikely(e && !err))
+ err = e;
+ if (!err)
+ au_refresh_hinode_attr(inode, update && isdir);
+
+out:
+ AuTraceErr(err);
+ return err;
+}
+
+static int set_inode(struct inode *inode, struct dentry *dentry)
+{
+ int err;
+ unsigned int flags;
+ umode_t mode;
+ aufs_bindex_t bindex, bstart, btail;
+ unsigned char isdir;
+ struct dentry *h_dentry;
+ struct inode *h_inode;
+ struct au_iinfo *iinfo;
+
+ IiMustWriteLock(inode);
+
+ err = 0;
+ isdir = 0;
+ bstart = au_dbstart(dentry);
+ h_inode = au_h_dptr(dentry, bstart)->d_inode;
+ mode = h_inode->i_mode;
+ switch (mode & S_IFMT) {
+ case S_IFREG:
+ btail = au_dbtail(dentry);
+ inode->i_op = &aufs_iop;
+ inode->i_fop = &aufs_file_fop;
+ err = au_dy_iaop(inode, bstart, h_inode);
+ if (unlikely(err))
+ goto out;
+ break;
+ case S_IFDIR:
+ isdir = 1;
+ btail = au_dbtaildir(dentry);
+ inode->i_op = &aufs_dir_iop;
+ inode->i_fop = &aufs_dir_fop;
+ break;
+ case S_IFLNK:
+ btail = au_dbtail(dentry);
+ inode->i_op = &aufs_symlink_iop;
+ break;
+ case S_IFBLK:
+ case S_IFCHR:
+ case S_IFIFO:
+ case S_IFSOCK:
+ btail = au_dbtail(dentry);
+ inode->i_op = &aufs_iop;
+ au_init_special_fop(inode, mode, h_inode->i_rdev);
+ break;
+ default:
+ AuIOErr("Unknown file type 0%o\n", mode);
+ err = -EIO;
+ goto out;
+ }
+
+ /* do not set hnotify for whiteouted dirs (SHWH mode) */
+ flags = au_hi_flags(inode, isdir);
+ if (au_opt_test(au_mntflags(dentry->d_sb), SHWH)
+ && au_ftest_hi(flags, HNOTIFY)
+ && dentry->d_name.len > AUFS_WH_PFX_LEN
+ && !memcmp(dentry->d_name.name, AUFS_WH_PFX, AUFS_WH_PFX_LEN))
+ au_fclr_hi(flags, HNOTIFY);
+ iinfo = au_ii(inode);
+ iinfo->ii_bstart = bstart;
+ iinfo->ii_bend = btail;
+ for (bindex = bstart; bindex <= btail; bindex++) {
+ h_dentry = au_h_dptr(dentry, bindex);
+ if (h_dentry)
+ au_set_h_iptr(inode, bindex,
+ au_igrab(h_dentry->d_inode), flags);
+ }
+ au_cpup_attr_all(inode, /*force*/1);
+
+out:
+ return err;
+}
+
+/*
+ * successful returns with iinfo write_locked
+ * minus: errno
+ * zero: success, matched
+ * plus: no error, but unmatched
+ */
+static int reval_inode(struct inode *inode, struct dentry *dentry)
+{
+ int err;
+ aufs_bindex_t bindex, bend;
+ struct inode *h_inode, *h_dinode;
+
+ /*
+ * before this function, if aufs got any iinfo lock, it must be only
+ * one, the parent dir.
+ * it can happen by UDBA and the obsoleted inode number.
+ */
+ err = -EIO;
+ if (unlikely(inode->i_ino == parent_ino(dentry)))
+ goto out;
+
+ err = 1;
+ ii_write_lock_new_child(inode);
+ h_dinode = au_h_dptr(dentry, au_dbstart(dentry))->d_inode;
+ bend = au_ibend(inode);
+ for (bindex = au_ibstart(inode); bindex <= bend; bindex++) {
+ h_inode = au_h_iptr(inode, bindex);
+ if (h_inode && h_inode == h_dinode) {
+ err = 0;
+ if (au_iigen_test(inode, au_digen(dentry)))
+ err = au_refresh_hinode(inode, dentry);
+ break;
+ }
+ }
+
+ if (unlikely(err))
+ ii_write_unlock(inode);
+out:
+ return err;
+}
+
+int au_ino(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
+ unsigned int d_type, ino_t *ino)
+{
+ int err;
+ struct mutex *mtx;
+
+ /* prevent hardlinked inode number from race condition */
+ mtx = NULL;
+ if (d_type != DT_DIR) {
+ mtx = &au_sbr(sb, bindex)->br_xino.xi_nondir_mtx;
+ mutex_lock(mtx);
+ }
+ err = au_xino_read(sb, bindex, h_ino, ino);
+ if (unlikely(err))
+ goto out;
+
+ if (!*ino) {
+ err = -EIO;
+ *ino = au_xino_new_ino(sb);
+ if (unlikely(!*ino))
+ goto out;
+ err = au_xino_write(sb, bindex, h_ino, *ino);
+ if (unlikely(err))
+ goto out;
+ }
+
+out:
+ if (mtx)
+ mutex_unlock(mtx);
+ return err;
+}
+
+/* successful returns with iinfo write_locked */
+/* todo: return with unlocked? */
+struct inode *au_new_inode(struct dentry *dentry, int must_new)
+{
+ struct inode *inode, *h_inode;
+ struct dentry *h_dentry;
+ struct super_block *sb;
+ struct mutex *mtx;
+ ino_t h_ino, ino;
+ int err;
+ aufs_bindex_t bstart;
+
+ sb = dentry->d_sb;
+ bstart = au_dbstart(dentry);
+ h_dentry = au_h_dptr(dentry, bstart);
+ h_inode = h_dentry->d_inode;
+ h_ino = h_inode->i_ino;
+
+ /*
+ * stop 'race'-ing between hardlinks under different
+ * parents.
+ */
+ mtx = NULL;
+ if (!S_ISDIR(h_inode->i_mode))
+ mtx = &au_sbr(sb, bstart)->br_xino.xi_nondir_mtx;
+
+new_ino:
+ if (mtx)
+ mutex_lock(mtx);
+ err = au_xino_read(sb, bstart, h_ino, &ino);
+ inode = ERR_PTR(err);
+ if (unlikely(err))
+ goto out;
+
+ if (!ino) {
+ ino = au_xino_new_ino(sb);
+ if (unlikely(!ino)) {
+ inode = ERR_PTR(-EIO);
+ goto out;
+ }
+ }
+
+ AuDbg("i%lu\n", (unsigned long)ino);
+ inode = au_iget_locked(sb, ino);
+ err = PTR_ERR(inode);
+ if (IS_ERR(inode))
+ goto out;
+
+ AuDbg("%lx, new %d\n", inode->i_state, !!(inode->i_state & I_NEW));
+ if (inode->i_state & I_NEW) {
+ ii_write_lock_new_child(inode);
+ err = set_inode(inode, dentry);
+ if (!err) {
+ unlock_new_inode(inode);
+ goto out; /* success */
+ }
+
+ /*
+ * iget_failed() calls iput(), but we need to call
+ * ii_write_unlock() after iget_failed(). so dirty hack for
+ * i_count.
+ */
+ atomic_inc(&inode->i_count);
+ iget_failed(inode);
+ ii_write_unlock(inode);
+ au_xino_write(sb, bstart, h_ino, /*ino*/0);
+ /* ignore this error */
+ goto out_iput;
+ } else if (!must_new && !IS_DEADDIR(inode) && inode->i_nlink) {
+ /*
+ * horrible race condition between lookup, readdir and copyup
+ * (or something).
+ */
+ if (mtx)
+ mutex_unlock(mtx);
+ err = reval_inode(inode, dentry);
+ if (unlikely(err < 0)) {
+ mtx = NULL;
+ goto out_iput;
+ }
+
+ if (!err) {
+ mtx = NULL;
+ goto out; /* success */
+ } else if (mtx)
+ mutex_lock(mtx);
+ }
+
+ if (unlikely(au_test_fs_unique_ino(h_dentry->d_inode)))
+ AuWarn1("Warning: Un-notified UDBA or repeatedly renamed dir,"
+ " b%d, %s, %.*s, hi%lu, i%lu.\n",
+ bstart, au_sbtype(h_dentry->d_sb), AuDLNPair(dentry),
+ (unsigned long)h_ino, (unsigned long)ino);
+ ino = 0;
+ err = au_xino_write(sb, bstart, h_ino, /*ino*/0);
+ if (!err) {
+ iput(inode);
+ if (mtx)
+ mutex_unlock(mtx);
+ goto new_ino;
+ }
+
+out_iput:
+ iput(inode);
+ inode = ERR_PTR(err);
+out:
+ if (mtx)
+ mutex_unlock(mtx);
+ return inode;
+}
+
+/* ---------------------------------------------------------------------- */
+
+int au_test_ro(struct super_block *sb, aufs_bindex_t bindex,
+ struct inode *inode)
+{
+ int err;
+
+ err = au_br_rdonly(au_sbr(sb, bindex));
+
+ /* pseudo-link after flushed may happen out of bounds */
+ if (!err
+ && inode
+ && au_ibstart(inode) <= bindex
+ && bindex <= au_ibend(inode)) {
+ /*
+ * permission check is unnecessary since vfsub routine
+ * will be called later
+ */
+ struct inode *hi = au_h_iptr(inode, bindex);
+ if (hi)
+ err = IS_IMMUTABLE(hi) ? -EROFS : 0;
+ }
+
+ return err;
+}
+
+int au_test_h_perm(struct inode *h_inode, int mask)
+{
+ if (!current_fsuid())
+ return 0;
+ return inode_permission(h_inode, mask);
+}
+
+int au_test_h_perm_sio(struct inode *h_inode, int mask)
+{
+ if (au_test_nfs(h_inode->i_sb)
+ && (mask & MAY_WRITE)
+ && S_ISDIR(h_inode->i_mode))
+ mask |= MAY_READ; /* force permission check */
+ return au_test_h_perm(h_inode, mask);
+}
diff -urN a/fs/aufs/inode.h b/fs/aufs/inode.h
--- a/fs/aufs/inode.h 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/inode.h 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,554 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * inode operations
+ */
+
+#ifndef __AUFS_INODE_H__
+#define __AUFS_INODE_H__
+
+#ifdef __KERNEL__
+
+#include <linux/fsnotify.h>
+#include "rwsem.h"
+
+struct vfsmount;
+
+struct au_hnotify {
+#ifdef CONFIG_AUFS_HNOTIFY
+#ifdef CONFIG_AUFS_HFSNOTIFY
+ /* never use fsnotify_add_vfsmount_mark() */
+ struct fsnotify_mark hn_mark;
+ int hn_mark_dead;
+#endif
+ struct inode *hn_aufs_inode; /* no get/put */
+#endif
+} ____cacheline_aligned_in_smp;
+
+struct au_hinode {
+ struct inode *hi_inode;
+ aufs_bindex_t hi_id;
+#ifdef CONFIG_AUFS_HNOTIFY
+ struct au_hnotify *hi_notify;
+#endif
+
+ /* reference to the copied-up whiteout with get/put */
+ struct dentry *hi_whdentry;
+};
+
+struct au_vdir;
+struct au_iinfo {
+ atomic_t ii_generation;
+ struct super_block *ii_hsb1; /* no get/put */
+
+ struct au_rwsem ii_rwsem;
+ aufs_bindex_t ii_bstart, ii_bend;
+ __u32 ii_higen;
+ struct au_hinode *ii_hinode;
+ struct au_vdir *ii_vdir;
+};
+
+struct au_icntnr {
+ struct au_iinfo iinfo;
+ struct inode vfs_inode;
+} ____cacheline_aligned_in_smp;
+
+/* au_pin flags */
+#define AuPin_DI_LOCKED 1
+#define AuPin_MNT_WRITE (1 << 1)
+#define au_ftest_pin(flags, name) ((flags) & AuPin_##name)
+#define au_fset_pin(flags, name) \
+ do { (flags) |= AuPin_##name; } while (0)
+#define au_fclr_pin(flags, name) \
+ do { (flags) &= ~AuPin_##name; } while (0)
+
+struct au_pin {
+ /* input */
+ struct dentry *dentry;
+ unsigned int udba;
+ unsigned char lsc_di, lsc_hi, flags;
+ aufs_bindex_t bindex;
+
+ /* output */
+ struct dentry *parent;
+ struct au_hinode *hdir;
+ struct vfsmount *h_mnt;
+};
+
+/* ---------------------------------------------------------------------- */
+
+static inline struct au_iinfo *au_ii(struct inode *inode)
+{
+ struct au_iinfo *iinfo;
+
+ iinfo = &(container_of(inode, struct au_icntnr, vfs_inode)->iinfo);
+ if (iinfo->ii_hinode)
+ return iinfo;
+ return NULL; /* debugging bad_inode case */
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* inode.c */
+struct inode *au_igrab(struct inode *inode);
+int au_refresh_hinode_self(struct inode *inode);
+int au_refresh_hinode(struct inode *inode, struct dentry *dentry);
+int au_ino(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
+ unsigned int d_type, ino_t *ino);
+struct inode *au_new_inode(struct dentry *dentry, int must_new);
+int au_test_ro(struct super_block *sb, aufs_bindex_t bindex,
+ struct inode *inode);
+int au_test_h_perm(struct inode *h_inode, int mask);
+int au_test_h_perm_sio(struct inode *h_inode, int mask);
+
+static inline int au_wh_ino(struct super_block *sb, aufs_bindex_t bindex,
+ ino_t h_ino, unsigned int d_type, ino_t *ino)
+{
+#ifdef CONFIG_AUFS_SHWH
+ return au_ino(sb, bindex, h_ino, d_type, ino);
+#else
+ return 0;
+#endif
+}
+
+/* i_op.c */
+extern struct inode_operations aufs_iop, aufs_symlink_iop, aufs_dir_iop;
+
+/* au_wr_dir flags */
+#define AuWrDir_ADD_ENTRY 1
+#define AuWrDir_ISDIR (1 << 1)
+#define au_ftest_wrdir(flags, name) ((flags) & AuWrDir_##name)
+#define au_fset_wrdir(flags, name) \
+ do { (flags) |= AuWrDir_##name; } while (0)
+#define au_fclr_wrdir(flags, name) \
+ do { (flags) &= ~AuWrDir_##name; } while (0)
+
+struct au_wr_dir_args {
+ aufs_bindex_t force_btgt;
+ unsigned char flags;
+};
+int au_wr_dir(struct dentry *dentry, struct dentry *src_dentry,
+ struct au_wr_dir_args *args);
+
+struct dentry *au_pinned_h_parent(struct au_pin *pin);
+void au_pin_init(struct au_pin *pin, struct dentry *dentry,
+ aufs_bindex_t bindex, int lsc_di, int lsc_hi,
+ unsigned int udba, unsigned char flags);
+int au_pin(struct au_pin *pin, struct dentry *dentry, aufs_bindex_t bindex,
+ unsigned int udba, unsigned char flags) __must_check;
+int au_do_pin(struct au_pin *pin) __must_check;
+void au_unpin(struct au_pin *pin);
+
+/* i_op_add.c */
+int au_may_add(struct dentry *dentry, aufs_bindex_t bindex,
+ struct dentry *h_parent, int isdir);
+int aufs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev);
+int aufs_symlink(struct inode *dir, struct dentry *dentry, const char *symname);
+int aufs_create(struct inode *dir, struct dentry *dentry, int mode,
+ struct nameidata *nd);
+int aufs_link(struct dentry *src_dentry, struct inode *dir,
+ struct dentry *dentry);
+int aufs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
+
+/* i_op_del.c */
+int au_wr_dir_need_wh(struct dentry *dentry, int isdir, aufs_bindex_t *bcpup);
+int au_may_del(struct dentry *dentry, aufs_bindex_t bindex,
+ struct dentry *h_parent, int isdir);
+int aufs_unlink(struct inode *dir, struct dentry *dentry);
+int aufs_rmdir(struct inode *dir, struct dentry *dentry);
+
+/* i_op_ren.c */
+int au_wbr(struct dentry *dentry, aufs_bindex_t btgt);
+int aufs_rename(struct inode *src_dir, struct dentry *src_dentry,
+ struct inode *dir, struct dentry *dentry);
+
+/* iinfo.c */
+struct inode *au_h_iptr(struct inode *inode, aufs_bindex_t bindex);
+void au_hiput(struct au_hinode *hinode);
+void au_set_hi_wh(struct inode *inode, aufs_bindex_t bindex,
+ struct dentry *h_wh);
+unsigned int au_hi_flags(struct inode *inode, int isdir);
+
+/* hinode flags */
+#define AuHi_XINO 1
+#define AuHi_HNOTIFY (1 << 1)
+#define au_ftest_hi(flags, name) ((flags) & AuHi_##name)
+#define au_fset_hi(flags, name) \
+ do { (flags) |= AuHi_##name; } while (0)
+#define au_fclr_hi(flags, name) \
+ do { (flags) &= ~AuHi_##name; } while (0)
+
+#ifndef CONFIG_AUFS_HNOTIFY
+#undef AuHi_HNOTIFY
+#define AuHi_HNOTIFY 0
+#endif
+
+void au_set_h_iptr(struct inode *inode, aufs_bindex_t bindex,
+ struct inode *h_inode, unsigned int flags);
+
+void au_update_iigen(struct inode *inode);
+void au_update_ibrange(struct inode *inode, int do_put_zero);
+
+void au_icntnr_init_once(void *_c);
+int au_iinfo_init(struct inode *inode);
+void au_iinfo_fin(struct inode *inode);
+int au_ii_realloc(struct au_iinfo *iinfo, int nbr);
+
+#ifdef CONFIG_PROC_FS
+/* plink.c */
+int au_plink_maint(struct super_block *sb, int flags);
+void au_plink_maint_leave(struct au_sbinfo *sbinfo);
+int au_plink_maint_enter(struct super_block *sb);
+#ifdef CONFIG_AUFS_DEBUG
+void au_plink_list(struct super_block *sb);
+#else
+AuStubVoid(au_plink_list, struct super_block *sb)
+#endif
+int au_plink_test(struct inode *inode);
+struct dentry *au_plink_lkup(struct inode *inode, aufs_bindex_t bindex);
+void au_plink_append(struct inode *inode, aufs_bindex_t bindex,
+ struct dentry *h_dentry);
+void au_plink_put(struct super_block *sb, int verbose);
+void au_plink_clean(struct super_block *sb, int verbose);
+void au_plink_half_refresh(struct super_block *sb, aufs_bindex_t br_id);
+#else
+AuStubInt0(au_plink_maint, struct super_block *sb, int flags);
+AuStubVoid(au_plink_maint_leave, struct au_sbinfo *sbinfo);
+AuStubInt0(au_plink_maint_enter, struct super_block *sb);
+AuStubVoid(au_plink_list, struct super_block *sb);
+AuStubInt0(au_plink_test, struct inode *inode);
+AuStub(struct dentry *, au_plink_lkup, return NULL,
+ struct inode *inode, aufs_bindex_t bindex);
+AuStubVoid(au_plink_append, struct inode *inode, aufs_bindex_t bindex,
+ struct dentry *h_dentry);
+AuStubVoid(au_plink_put, struct super_block *sb, int verbose);
+AuStubVoid(au_plink_clean, struct super_block *sb, int verbose);
+AuStubVoid(au_plink_half_refresh, struct super_block *sb, aufs_bindex_t br_id);
+#endif /* CONFIG_PROC_FS */
+
+/* ---------------------------------------------------------------------- */
+
+/* lock subclass for iinfo */
+enum {
+ AuLsc_II_CHILD, /* child first */
+ AuLsc_II_CHILD2, /* rename(2), link(2), and cpup at hnotify */
+ AuLsc_II_CHILD3, /* copyup dirs */
+ AuLsc_II_PARENT, /* see AuLsc_I_PARENT in vfsub.h */
+ AuLsc_II_PARENT2,
+ AuLsc_II_PARENT3, /* copyup dirs */
+ AuLsc_II_NEW_CHILD
+};
+
+/*
+ * ii_read_lock_child, ii_write_lock_child,
+ * ii_read_lock_child2, ii_write_lock_child2,
+ * ii_read_lock_child3, ii_write_lock_child3,
+ * ii_read_lock_parent, ii_write_lock_parent,
+ * ii_read_lock_parent2, ii_write_lock_parent2,
+ * ii_read_lock_parent3, ii_write_lock_parent3,
+ * ii_read_lock_new_child, ii_write_lock_new_child,
+ */
+#define AuReadLockFunc(name, lsc) \
+static inline void ii_read_lock_##name(struct inode *i) \
+{ \
+ au_rw_read_lock_nested(&au_ii(i)->ii_rwsem, AuLsc_II_##lsc); \
+}
+
+#define AuWriteLockFunc(name, lsc) \
+static inline void ii_write_lock_##name(struct inode *i) \
+{ \
+ au_rw_write_lock_nested(&au_ii(i)->ii_rwsem, AuLsc_II_##lsc); \
+}
+
+#define AuRWLockFuncs(name, lsc) \
+ AuReadLockFunc(name, lsc) \
+ AuWriteLockFunc(name, lsc)
+
+AuRWLockFuncs(child, CHILD);
+AuRWLockFuncs(child2, CHILD2);
+AuRWLockFuncs(child3, CHILD3);
+AuRWLockFuncs(parent, PARENT);
+AuRWLockFuncs(parent2, PARENT2);
+AuRWLockFuncs(parent3, PARENT3);
+AuRWLockFuncs(new_child, NEW_CHILD);
+
+#undef AuReadLockFunc
+#undef AuWriteLockFunc
+#undef AuRWLockFuncs
+
+/*
+ * ii_read_unlock, ii_write_unlock, ii_downgrade_lock
+ */
+AuSimpleUnlockRwsemFuncs(ii, struct inode *i, &au_ii(i)->ii_rwsem);
+
+#define IiMustNoWaiters(i) AuRwMustNoWaiters(&au_ii(i)->ii_rwsem)
+#define IiMustAnyLock(i) AuRwMustAnyLock(&au_ii(i)->ii_rwsem)
+#define IiMustWriteLock(i) AuRwMustWriteLock(&au_ii(i)->ii_rwsem)
+
+/* ---------------------------------------------------------------------- */
+
+static inline void au_icntnr_init(struct au_icntnr *c)
+{
+#ifdef CONFIG_AUFS_DEBUG
+ c->vfs_inode.i_mode = 0;
+#endif
+}
+
+static inline unsigned int au_iigen(struct inode *inode)
+{
+ return atomic_read(&au_ii(inode)->ii_generation);
+}
+
+/* tiny test for inode number */
+/* tmpfs generation is too rough */
+static inline int au_test_higen(struct inode *inode, struct inode *h_inode)
+{
+ struct au_iinfo *iinfo;
+
+ iinfo = au_ii(inode);
+ AuRwMustAnyLock(&iinfo->ii_rwsem);
+ return !(iinfo->ii_hsb1 == h_inode->i_sb
+ && iinfo->ii_higen == h_inode->i_generation);
+}
+
+static inline void au_iigen_dec(struct inode *inode)
+{
+ atomic_dec(&au_ii(inode)->ii_generation);
+}
+
+static inline int au_iigen_test(struct inode *inode, unsigned int sigen)
+{
+ int err;
+
+ err = 0;
+ if (unlikely(inode && au_iigen(inode) != sigen))
+ err = -EIO;
+
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static inline aufs_bindex_t au_ii_br_id(struct inode *inode,
+ aufs_bindex_t bindex)
+{
+ IiMustAnyLock(inode);
+ return au_ii(inode)->ii_hinode[0 + bindex].hi_id;
+}
+
+static inline aufs_bindex_t au_ibstart(struct inode *inode)
+{
+ IiMustAnyLock(inode);
+ return au_ii(inode)->ii_bstart;
+}
+
+static inline aufs_bindex_t au_ibend(struct inode *inode)
+{
+ IiMustAnyLock(inode);
+ return au_ii(inode)->ii_bend;
+}
+
+static inline struct au_vdir *au_ivdir(struct inode *inode)
+{
+ IiMustAnyLock(inode);
+ return au_ii(inode)->ii_vdir;
+}
+
+static inline struct dentry *au_hi_wh(struct inode *inode, aufs_bindex_t bindex)
+{
+ IiMustAnyLock(inode);
+ return au_ii(inode)->ii_hinode[0 + bindex].hi_whdentry;
+}
+
+static inline void au_set_ibstart(struct inode *inode, aufs_bindex_t bindex)
+{
+ IiMustWriteLock(inode);
+ au_ii(inode)->ii_bstart = bindex;
+}
+
+static inline void au_set_ibend(struct inode *inode, aufs_bindex_t bindex)
+{
+ IiMustWriteLock(inode);
+ au_ii(inode)->ii_bend = bindex;
+}
+
+static inline void au_set_ivdir(struct inode *inode, struct au_vdir *vdir)
+{
+ IiMustWriteLock(inode);
+ au_ii(inode)->ii_vdir = vdir;
+}
+
+static inline struct au_hinode *au_hi(struct inode *inode, aufs_bindex_t bindex)
+{
+ IiMustAnyLock(inode);
+ return au_ii(inode)->ii_hinode + bindex;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static inline struct dentry *au_pinned_parent(struct au_pin *pin)
+{
+ if (pin)
+ return pin->parent;
+ return NULL;
+}
+
+static inline struct inode *au_pinned_h_dir(struct au_pin *pin)
+{
+ if (pin && pin->hdir)
+ return pin->hdir->hi_inode;
+ return NULL;
+}
+
+static inline struct au_hinode *au_pinned_hdir(struct au_pin *pin)
+{
+ if (pin)
+ return pin->hdir;
+ return NULL;
+}
+
+static inline void au_pin_set_dentry(struct au_pin *pin, struct dentry *dentry)
+{
+ if (pin)
+ pin->dentry = dentry;
+}
+
+static inline void au_pin_set_parent_lflag(struct au_pin *pin,
+ unsigned char lflag)
+{
+ if (pin) {
+ if (lflag)
+ au_fset_pin(pin->flags, DI_LOCKED);
+ else
+ au_fclr_pin(pin->flags, DI_LOCKED);
+ }
+}
+
+static inline void au_pin_set_parent(struct au_pin *pin, struct dentry *parent)
+{
+ if (pin) {
+ dput(pin->parent);
+ pin->parent = dget(parent);
+ }
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct au_branch;
+#ifdef CONFIG_AUFS_HNOTIFY
+struct au_hnotify_op {
+ void (*ctl)(struct au_hinode *hinode, int do_set);
+ int (*alloc)(struct au_hinode *hinode);
+ void (*free)(struct au_hinode *hinode);
+
+ void (*fin)(void);
+ int (*init)(void);
+
+ int (*reset_br)(unsigned int udba, struct au_branch *br, int perm);
+ void (*fin_br)(struct au_branch *br);
+ int (*init_br)(struct au_branch *br, int perm);
+};
+
+/* hnotify.c */
+int au_hn_alloc(struct au_hinode *hinode, struct inode *inode);
+void au_hn_free(struct au_hinode *hinode);
+void au_hn_ctl(struct au_hinode *hinode, int do_set);
+void au_hn_reset(struct inode *inode, unsigned int flags);
+int au_hnotify(struct inode *h_dir, struct au_hnotify *hnotify, u32 mask,
+ struct qstr *h_child_qstr, struct inode *h_child_inode);
+int au_hnotify_reset_br(unsigned int udba, struct au_branch *br, int perm);
+int au_hnotify_init_br(struct au_branch *br, int perm);
+void au_hnotify_fin_br(struct au_branch *br);
+int __init au_hnotify_init(void);
+void au_hnotify_fin(void);
+
+/* hfsnotify.c */
+extern const struct au_hnotify_op au_hnotify_op;
+
+static inline
+void au_hn_init(struct au_hinode *hinode)
+{
+ hinode->hi_notify = NULL;
+}
+
+static inline struct au_hnotify *au_hn(struct au_hinode *hinode)
+{
+ return hinode->hi_notify;
+}
+
+#else
+static inline
+int au_hn_alloc(struct au_hinode *hinode __maybe_unused,
+ struct inode *inode __maybe_unused)
+{
+ return -EOPNOTSUPP;
+}
+
+static inline struct au_hnotify *au_hn(struct au_hinode *hinode)
+{
+ return NULL;
+}
+
+AuStubVoid(au_hn_free, struct au_hinode *hinode __maybe_unused)
+AuStubVoid(au_hn_ctl, struct au_hinode *hinode __maybe_unused,
+ int do_set __maybe_unused)
+AuStubVoid(au_hn_reset, struct inode *inode __maybe_unused,
+ unsigned int flags __maybe_unused)
+AuStubInt0(au_hnotify_reset_br, unsigned int udba __maybe_unused,
+ struct au_branch *br __maybe_unused,
+ int perm __maybe_unused)
+AuStubInt0(au_hnotify_init_br, struct au_branch *br __maybe_unused,
+ int perm __maybe_unused)
+AuStubVoid(au_hnotify_fin_br, struct au_branch *br __maybe_unused)
+AuStubInt0(__init au_hnotify_init, void)
+AuStubVoid(au_hnotify_fin, void)
+AuStubVoid(au_hn_init, struct au_hinode *hinode __maybe_unused)
+#endif /* CONFIG_AUFS_HNOTIFY */
+
+static inline void au_hn_suspend(struct au_hinode *hdir)
+{
+ au_hn_ctl(hdir, /*do_set*/0);
+}
+
+static inline void au_hn_resume(struct au_hinode *hdir)
+{
+ au_hn_ctl(hdir, /*do_set*/1);
+}
+
+static inline void au_hn_imtx_lock(struct au_hinode *hdir)
+{
+ mutex_lock(&hdir->hi_inode->i_mutex);
+ au_hn_suspend(hdir);
+}
+
+static inline void au_hn_imtx_lock_nested(struct au_hinode *hdir,
+ unsigned int sc __maybe_unused)
+{
+ mutex_lock_nested(&hdir->hi_inode->i_mutex, sc);
+ au_hn_suspend(hdir);
+}
+
+static inline void au_hn_imtx_unlock(struct au_hinode *hdir)
+{
+ au_hn_resume(hdir);
+ mutex_unlock(&hdir->hi_inode->i_mutex);
+}
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_INODE_H__ */
diff -urN a/fs/aufs/ioctl.c b/fs/aufs/ioctl.c
--- a/fs/aufs/ioctl.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/ioctl.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,196 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * ioctl
+ * plink-management and readdir in userspace.
+ * assist the pathconf(3) wrapper library.
+ */
+
+#include "aufs.h"
+
+static int au_wbr_fd(struct path *path, struct aufs_wbr_fd __user *arg)
+{
+ int err, fd;
+ aufs_bindex_t wbi, bindex, bend;
+ struct file *h_file;
+ struct super_block *sb;
+ struct dentry *root;
+ struct au_branch *br;
+ struct aufs_wbr_fd wbrfd = {
+ .oflags = au_dir_roflags,
+ .brid = -1
+ };
+ const int valid = O_RDONLY | O_NONBLOCK | O_LARGEFILE | O_DIRECTORY
+ | O_NOATIME | O_CLOEXEC;
+
+ AuDebugOn(wbrfd.oflags & ~valid);
+
+ if (arg) {
+ err = copy_from_user(&wbrfd, arg, sizeof(wbrfd));
+ if (unlikely(err)) {
+ err = -EFAULT;
+ goto out;
+ }
+
+ err = -EINVAL;
+ AuDbg("wbrfd{0%o, %d}\n", wbrfd.oflags, wbrfd.brid);
+ wbrfd.oflags |= au_dir_roflags;
+ AuDbg("0%o\n", wbrfd.oflags);
+ if (unlikely(wbrfd.oflags & ~valid))
+ goto out;
+ }
+
+ fd = get_unused_fd();
+ err = fd;
+ if (unlikely(fd < 0))
+ goto out;
+
+ h_file = ERR_PTR(-EINVAL);
+ wbi = 0;
+ br = NULL;
+ sb = path->dentry->d_sb;
+ root = sb->s_root;
+ aufs_read_lock(root, AuLock_IR);
+ bend = au_sbend(sb);
+ if (wbrfd.brid >= 0) {
+ wbi = au_br_index(sb, wbrfd.brid);
+ if (unlikely(wbi < 0 || wbi > bend))
+ goto out_unlock;
+ }
+
+ h_file = ERR_PTR(-ENOENT);
+ br = au_sbr(sb, wbi);
+ if (!au_br_writable(br->br_perm)) {
+ if (arg)
+ goto out_unlock;
+
+ bindex = wbi + 1;
+ wbi = -1;
+ for (; bindex <= bend; bindex++) {
+ br = au_sbr(sb, bindex);
+ if (au_br_writable(br->br_perm)) {
+ wbi = bindex;
+ br = au_sbr(sb, wbi);
+ break;
+ }
+ }
+ }
+ AuDbg("wbi %d\n", wbi);
+ if (wbi >= 0)
+ h_file = au_h_open(root, wbi, wbrfd.oflags, NULL);
+
+out_unlock:
+ aufs_read_unlock(root, AuLock_IR);
+ err = PTR_ERR(h_file);
+ if (IS_ERR(h_file))
+ goto out_fd;
+
+ atomic_dec(&br->br_count); /* cf. au_h_open() */
+ fd_install(fd, h_file);
+ err = fd;
+ goto out; /* success */
+
+out_fd:
+ put_unused_fd(fd);
+out:
+ AuTraceErr(err);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+long aufs_ioctl_dir(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ long err;
+
+ switch (cmd) {
+ case AUFS_CTL_RDU:
+ case AUFS_CTL_RDU_INO:
+ err = au_rdu_ioctl(file, cmd, arg);
+ break;
+
+ case AUFS_CTL_WBR_FD:
+ err = au_wbr_fd(&file->f_path, (void __user *)arg);
+ break;
+
+ case AUFS_CTL_IBUSY:
+ err = au_ibusy_ioctl(file, arg);
+ break;
+
+ default:
+ /* do not call the lower */
+ AuDbg("0x%x\n", cmd);
+ err = -ENOTTY;
+ }
+
+ AuTraceErr(err);
+ return err;
+}
+
+long aufs_ioctl_nondir(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ long err;
+
+ switch (cmd) {
+ case AUFS_CTL_WBR_FD:
+ err = au_wbr_fd(&file->f_path, (void __user *)arg);
+ break;
+
+ default:
+ /* do not call the lower */
+ AuDbg("0x%x\n", cmd);
+ err = -ENOTTY;
+ }
+
+ AuTraceErr(err);
+ return err;
+}
+
+#ifdef CONFIG_COMPAT
+long aufs_compat_ioctl_dir(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ long err;
+
+ switch (cmd) {
+ case AUFS_CTL_RDU:
+ case AUFS_CTL_RDU_INO:
+ err = au_rdu_compat_ioctl(file, cmd, arg);
+ break;
+
+ case AUFS_CTL_IBUSY:
+ err = au_ibusy_compat_ioctl(file, arg);
+ break;
+
+ default:
+ err = aufs_ioctl_dir(file, cmd, arg);
+ }
+
+ AuTraceErr(err);
+ return err;
+}
+
+#if 0 /* unused yet */
+long aufs_compat_ioctl_nondir(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ return aufs_ioctl_nondir(file, cmd, (unsigned long)compat_ptr(arg));
+}
+#endif
+#endif
diff -urN a/fs/aufs/i_op_add.c b/fs/aufs/i_op_add.c
--- a/fs/aufs/i_op_add.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/i_op_add.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,711 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * inode operations (add entry)
+ */
+
+#include "aufs.h"
+
+/*
+ * final procedure of adding a new entry, except link(2).
+ * remove whiteout, instantiate, copyup the parent dir's times and size
+ * and update version.
+ * if it failed, re-create the removed whiteout.
+ */
+static int epilog(struct inode *dir, aufs_bindex_t bindex,
+ struct dentry *wh_dentry, struct dentry *dentry)
+{
+ int err, rerr;
+ aufs_bindex_t bwh;
+ struct path h_path;
+ struct inode *inode, *h_dir;
+ struct dentry *wh;
+
+ bwh = -1;
+ if (wh_dentry) {
+ h_dir = wh_dentry->d_parent->d_inode; /* dir inode is locked */
+ IMustLock(h_dir);
+ AuDebugOn(au_h_iptr(dir, bindex) != h_dir);
+ bwh = au_dbwh(dentry);
+ h_path.dentry = wh_dentry;
+ h_path.mnt = au_sbr_mnt(dir->i_sb, bindex);
+ err = au_wh_unlink_dentry(au_h_iptr(dir, bindex), &h_path,
+ dentry);
+ if (unlikely(err))
+ goto out;
+ }
+
+ inode = au_new_inode(dentry, /*must_new*/1);
+ if (!IS_ERR(inode)) {
+ d_instantiate(dentry, inode);
+ dir = dentry->d_parent->d_inode; /* dir inode is locked */
+ IMustLock(dir);
+ if (au_ibstart(dir) == au_dbstart(dentry))
+ au_cpup_attr_timesizes(dir);
+ dir->i_version++;
+ return 0; /* success */
+ }
+
+ err = PTR_ERR(inode);
+ if (!wh_dentry)
+ goto out;
+
+ /* revert */
+ /* dir inode is locked */
+ wh = au_wh_create(dentry, bwh, wh_dentry->d_parent);
+ rerr = PTR_ERR(wh);
+ if (IS_ERR(wh)) {
+ AuIOErr("%.*s reverting whiteout failed(%d, %d)\n",
+ AuDLNPair(dentry), err, rerr);
+ err = -EIO;
+ } else
+ dput(wh);
+
+out:
+ return err;
+}
+
+static int au_d_may_add(struct dentry *dentry)
+{
+ int err;
+
+ err = 0;
+ if (unlikely(d_unhashed(dentry)))
+ err = -ENOENT;
+ if (unlikely(dentry->d_inode))
+ err = -EEXIST;
+ return err;
+}
+
+/*
+ * simple tests for the adding inode operations.
+ * following the checks in vfs, plus the parent-child relationship.
+ */
+int au_may_add(struct dentry *dentry, aufs_bindex_t bindex,
+ struct dentry *h_parent, int isdir)
+{
+ int err;
+ umode_t h_mode;
+ struct dentry *h_dentry;
+ struct inode *h_inode;
+
+ err = -ENAMETOOLONG;
+ if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN))
+ goto out;
+
+ h_dentry = au_h_dptr(dentry, bindex);
+ h_inode = h_dentry->d_inode;
+ if (!dentry->d_inode) {
+ err = -EEXIST;
+ if (unlikely(h_inode))
+ goto out;
+ } else {
+ /* rename(2) case */
+ err = -EIO;
+ if (unlikely(!h_inode || !h_inode->i_nlink))
+ goto out;
+
+ h_mode = h_inode->i_mode;
+ if (!isdir) {
+ err = -EISDIR;
+ if (unlikely(S_ISDIR(h_mode)))
+ goto out;
+ } else if (unlikely(!S_ISDIR(h_mode))) {
+ err = -ENOTDIR;
+ goto out;
+ }
+ }
+
+ err = 0;
+ /* expected parent dir is locked */
+ if (unlikely(h_parent != h_dentry->d_parent))
+ err = -EIO;
+
+out:
+ AuTraceErr(err);
+ return err;
+}
+
+/*
+ * initial procedure of adding a new entry.
+ * prepare writable branch and the parent dir, lock it,
+ * and lookup whiteout for the new entry.
+ */
+static struct dentry*
+lock_hdir_lkup_wh(struct dentry *dentry, struct au_dtime *dt,
+ struct dentry *src_dentry, struct au_pin *pin,
+ struct au_wr_dir_args *wr_dir_args)
+{
+ struct dentry *wh_dentry, *h_parent;
+ struct super_block *sb;
+ struct au_branch *br;
+ int err;
+ unsigned int udba;
+ aufs_bindex_t bcpup;
+
+ AuDbg("%.*s\n", AuDLNPair(dentry));
+
+ err = au_wr_dir(dentry, src_dentry, wr_dir_args);
+ bcpup = err;
+ wh_dentry = ERR_PTR(err);
+ if (unlikely(err < 0))
+ goto out;
+
+ sb = dentry->d_sb;
+ udba = au_opt_udba(sb);
+ err = au_pin(pin, dentry, bcpup, udba,
+ AuPin_DI_LOCKED | AuPin_MNT_WRITE);
+ wh_dentry = ERR_PTR(err);
+ if (unlikely(err))
+ goto out;
+
+ h_parent = au_pinned_h_parent(pin);
+ if (udba != AuOpt_UDBA_NONE
+ && au_dbstart(dentry) == bcpup)
+ err = au_may_add(dentry, bcpup, h_parent,
+ au_ftest_wrdir(wr_dir_args->flags, ISDIR));
+ else if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN))
+ err = -ENAMETOOLONG;
+ wh_dentry = ERR_PTR(err);
+ if (unlikely(err))
+ goto out_unpin;
+
+ br = au_sbr(sb, bcpup);
+ if (dt) {
+ struct path tmp = {
+ .dentry = h_parent,
+ .mnt = br->br_mnt
+ };
+ au_dtime_store(dt, au_pinned_parent(pin), &tmp);
+ }
+
+ wh_dentry = NULL;
+ if (bcpup != au_dbwh(dentry))
+ goto out; /* success */
+
+ wh_dentry = au_wh_lkup(h_parent, &dentry->d_name, br);
+
+out_unpin:
+ if (IS_ERR(wh_dentry))
+ au_unpin(pin);
+out:
+ return wh_dentry;
+}
+
+/* ---------------------------------------------------------------------- */
+
+enum { Mknod, Symlink, Creat };
+struct simple_arg {
+ int type;
+ union {
+ struct {
+ int mode;
+ struct nameidata *nd;
+ } c;
+ struct {
+ const char *symname;
+ } s;
+ struct {
+ int mode;
+ dev_t dev;
+ } m;
+ } u;
+};
+
+static int add_simple(struct inode *dir, struct dentry *dentry,
+ struct simple_arg *arg)
+{
+ int err;
+ aufs_bindex_t bstart;
+ unsigned char created;
+ struct au_dtime dt;
+ struct au_pin pin;
+ struct path h_path;
+ struct dentry *wh_dentry, *parent;
+ struct inode *h_dir;
+ struct au_wr_dir_args wr_dir_args = {
+ .force_btgt = -1,
+ .flags = AuWrDir_ADD_ENTRY
+ };
+
+ AuDbg("%.*s\n", AuDLNPair(dentry));
+ IMustLock(dir);
+
+ parent = dentry->d_parent; /* dir inode is locked */
+ err = aufs_read_lock(dentry, AuLock_DW | AuLock_GEN);
+ if (unlikely(err))
+ goto out;
+ err = au_d_may_add(dentry);
+ if (unlikely(err))
+ goto out_unlock;
+ di_write_lock_parent(parent);
+ wh_dentry = lock_hdir_lkup_wh(dentry, &dt, /*src_dentry*/NULL, &pin,
+ &wr_dir_args);
+ err = PTR_ERR(wh_dentry);
+ if (IS_ERR(wh_dentry))
+ goto out_parent;
+
+ bstart = au_dbstart(dentry);
+ h_path.dentry = au_h_dptr(dentry, bstart);
+ h_path.mnt = au_sbr_mnt(dentry->d_sb, bstart);
+ h_dir = au_pinned_h_dir(&pin);
+ switch (arg->type) {
+ case Creat:
+ err = vfsub_create(h_dir, &h_path, arg->u.c.mode);
+ break;
+ case Symlink:
+ err = vfsub_symlink(h_dir, &h_path, arg->u.s.symname);
+ break;
+ case Mknod:
+ err = vfsub_mknod(h_dir, &h_path, arg->u.m.mode, arg->u.m.dev);
+ break;
+ default:
+ BUG();
+ }
+ created = !err;
+ if (!err)
+ err = epilog(dir, bstart, wh_dentry, dentry);
+
+ /* revert */
+ if (unlikely(created && err && h_path.dentry->d_inode)) {
+ int rerr;
+ rerr = vfsub_unlink(h_dir, &h_path, /*force*/0);
+ if (rerr) {
+ AuIOErr("%.*s revert failure(%d, %d)\n",
+ AuDLNPair(dentry), err, rerr);
+ err = -EIO;
+ }
+ au_dtime_revert(&dt);
+ }
+
+ au_unpin(&pin);
+ dput(wh_dentry);
+
+out_parent:
+ di_write_unlock(parent);
+out_unlock:
+ if (unlikely(err)) {
+ au_update_dbstart(dentry);
+ d_drop(dentry);
+ }
+ aufs_read_unlock(dentry, AuLock_DW);
+out:
+ return err;
+}
+
+int aufs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
+{
+ struct simple_arg arg = {
+ .type = Mknod,
+ .u.m = {
+ .mode = mode,
+ .dev = dev
+ }
+ };
+ return add_simple(dir, dentry, &arg);
+}
+
+int aufs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
+{
+ struct simple_arg arg = {
+ .type = Symlink,
+ .u.s.symname = symname
+ };
+ return add_simple(dir, dentry, &arg);
+}
+
+int aufs_create(struct inode *dir, struct dentry *dentry, int mode,
+ struct nameidata *nd)
+{
+ struct simple_arg arg = {
+ .type = Creat,
+ .u.c = {
+ .mode = mode,
+ .nd = nd
+ }
+ };
+ return add_simple(dir, dentry, &arg);
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct au_link_args {
+ aufs_bindex_t bdst, bsrc;
+ struct au_pin pin;
+ struct path h_path;
+ struct dentry *src_parent, *parent;
+};
+
+static int au_cpup_before_link(struct dentry *src_dentry,
+ struct au_link_args *a)
+{
+ int err;
+ struct dentry *h_src_dentry;
+ struct mutex *h_mtx;
+ struct file *h_file;
+
+ di_read_lock_parent(a->src_parent, AuLock_IR);
+ err = au_test_and_cpup_dirs(src_dentry, a->bdst);
+ if (unlikely(err))
+ goto out;
+
+ h_src_dentry = au_h_dptr(src_dentry, a->bsrc);
+ h_mtx = &h_src_dentry->d_inode->i_mutex;
+ err = au_pin(&a->pin, src_dentry, a->bdst,
+ au_opt_udba(src_dentry->d_sb),
+ AuPin_DI_LOCKED | AuPin_MNT_WRITE);
+ if (unlikely(err))
+ goto out;
+ mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
+ h_file = au_h_open_pre(src_dentry, a->bsrc);
+ if (IS_ERR(h_file)) {
+ err = PTR_ERR(h_file);
+ h_file = NULL;
+ } else
+ err = au_sio_cpup_simple(src_dentry, a->bdst, -1,
+ AuCpup_DTIME /* | AuCpup_KEEPLINO */);
+ mutex_unlock(h_mtx);
+ au_h_open_post(src_dentry, a->bsrc, h_file);
+ au_unpin(&a->pin);
+
+out:
+ di_read_unlock(a->src_parent, AuLock_IR);
+ return err;
+}
+
+static int au_cpup_or_link(struct dentry *src_dentry, struct au_link_args *a)
+{
+ int err;
+ unsigned char plink;
+ struct inode *h_inode, *inode;
+ struct dentry *h_src_dentry;
+ struct super_block *sb;
+ struct file *h_file;
+
+ plink = 0;
+ h_inode = NULL;
+ sb = src_dentry->d_sb;
+ inode = src_dentry->d_inode;
+ if (au_ibstart(inode) <= a->bdst)
+ h_inode = au_h_iptr(inode, a->bdst);
+ if (!h_inode || !h_inode->i_nlink) {
+ /* copyup src_dentry as the name of dentry. */
+ au_set_dbstart(src_dentry, a->bdst);
+ au_set_h_dptr(src_dentry, a->bdst, dget(a->h_path.dentry));
+ h_inode = au_h_dptr(src_dentry, a->bsrc)->d_inode;
+ mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
+ h_file = au_h_open_pre(src_dentry, a->bsrc);
+ if (IS_ERR(h_file)) {
+ err = PTR_ERR(h_file);
+ h_file = NULL;
+ } else
+ err = au_sio_cpup_single(src_dentry, a->bdst, a->bsrc,
+ -1, AuCpup_KEEPLINO,
+ a->parent);
+ mutex_unlock(&h_inode->i_mutex);
+ au_h_open_post(src_dentry, a->bsrc, h_file);
+ au_set_h_dptr(src_dentry, a->bdst, NULL);
+ au_set_dbstart(src_dentry, a->bsrc);
+ } else {
+ /* the inode of src_dentry already exists on a.bdst branch */
+ h_src_dentry = d_find_alias(h_inode);
+ if (!h_src_dentry && au_plink_test(inode)) {
+ plink = 1;
+ h_src_dentry = au_plink_lkup(inode, a->bdst);
+ err = PTR_ERR(h_src_dentry);
+ if (IS_ERR(h_src_dentry))
+ goto out;
+
+ if (unlikely(!h_src_dentry->d_inode)) {
+ dput(h_src_dentry);
+ h_src_dentry = NULL;
+ }
+
+ }
+ if (h_src_dentry) {
+ err = vfsub_link(h_src_dentry, au_pinned_h_dir(&a->pin),
+ &a->h_path);
+ dput(h_src_dentry);
+ } else {
+ AuIOErr("no dentry found for hi%lu on b%d\n",
+ h_inode->i_ino, a->bdst);
+ err = -EIO;
+ }
+ }
+
+ if (!err && !plink)
+ au_plink_append(inode, a->bdst, a->h_path.dentry);
+
+out:
+ AuTraceErr(err);
+ return err;
+}
+
+int aufs_link(struct dentry *src_dentry, struct inode *dir,
+ struct dentry *dentry)
+{
+ int err, rerr;
+ struct au_dtime dt;
+ struct au_link_args *a;
+ struct dentry *wh_dentry, *h_src_dentry;
+ struct inode *inode;
+ struct super_block *sb;
+ struct au_wr_dir_args wr_dir_args = {
+ /* .force_btgt = -1, */
+ .flags = AuWrDir_ADD_ENTRY
+ };
+
+ IMustLock(dir);
+ inode = src_dentry->d_inode;
+ IMustLock(inode);
+
+ err = -ENOMEM;
+ a = kzalloc(sizeof(*a), GFP_NOFS);
+ if (unlikely(!a))
+ goto out;
+
+ a->parent = dentry->d_parent; /* dir inode is locked */
+ err = aufs_read_and_write_lock2(dentry, src_dentry,
+ AuLock_NOPLM | AuLock_GEN);
+ if (unlikely(err))
+ goto out_kfree;
+ err = au_d_hashed_positive(src_dentry);
+ if (unlikely(err))
+ goto out_unlock;
+ err = au_d_may_add(dentry);
+ if (unlikely(err))
+ goto out_unlock;
+
+ a->src_parent = dget_parent(src_dentry);
+ wr_dir_args.force_btgt = au_ibstart(inode);
+
+ di_write_lock_parent(a->parent);
+ wr_dir_args.force_btgt = au_wbr(dentry, wr_dir_args.force_btgt);
+ wh_dentry = lock_hdir_lkup_wh(dentry, &dt, src_dentry, &a->pin,
+ &wr_dir_args);
+ err = PTR_ERR(wh_dentry);
+ if (IS_ERR(wh_dentry))
+ goto out_parent;
+
+ err = 0;
+ sb = dentry->d_sb;
+ a->bdst = au_dbstart(dentry);
+ a->h_path.dentry = au_h_dptr(dentry, a->bdst);
+ a->h_path.mnt = au_sbr_mnt(sb, a->bdst);
+ a->bsrc = au_ibstart(inode);
+ h_src_dentry = au_h_d_alias(src_dentry, a->bsrc);
+ if (!h_src_dentry) {
+ a->bsrc = au_dbstart(src_dentry);
+ h_src_dentry = au_h_d_alias(src_dentry, a->bsrc);
+ AuDebugOn(!h_src_dentry);
+ } else if (IS_ERR(h_src_dentry))
+ goto out_parent;
+
+ if (au_opt_test(au_mntflags(sb), PLINK)) {
+ if (a->bdst < a->bsrc
+ /* && h_src_dentry->d_sb != a->h_path.dentry->d_sb */)
+ err = au_cpup_or_link(src_dentry, a);
+ else
+ err = vfsub_link(h_src_dentry, au_pinned_h_dir(&a->pin),
+ &a->h_path);
+ dput(h_src_dentry);
+ } else {
+ /*
+ * copyup src_dentry to the branch we process,
+ * and then link(2) to it.
+ */
+ dput(h_src_dentry);
+ if (a->bdst < a->bsrc
+ /* && h_src_dentry->d_sb != a->h_path.dentry->d_sb */) {
+ au_unpin(&a->pin);
+ di_write_unlock(a->parent);
+ err = au_cpup_before_link(src_dentry, a);
+ di_write_lock_parent(a->parent);
+ if (!err)
+ err = au_pin(&a->pin, dentry, a->bdst,
+ au_opt_udba(sb),
+ AuPin_DI_LOCKED | AuPin_MNT_WRITE);
+ if (unlikely(err))
+ goto out_wh;
+ }
+ if (!err) {
+ h_src_dentry = au_h_dptr(src_dentry, a->bdst);
+ err = -ENOENT;
+ if (h_src_dentry && h_src_dentry->d_inode)
+ err = vfsub_link(h_src_dentry,
+ au_pinned_h_dir(&a->pin),
+ &a->h_path);
+ }
+ }
+ if (unlikely(err))
+ goto out_unpin;
+
+ if (wh_dentry) {
+ a->h_path.dentry = wh_dentry;
+ err = au_wh_unlink_dentry(au_pinned_h_dir(&a->pin), &a->h_path,
+ dentry);
+ if (unlikely(err))
+ goto out_revert;
+ }
+
+ dir->i_version++;
+ if (au_ibstart(dir) == au_dbstart(dentry))
+ au_cpup_attr_timesizes(dir);
+ inc_nlink(inode);
+ inode->i_ctime = dir->i_ctime;
+ d_instantiate(dentry, au_igrab(inode));
+ if (d_unhashed(a->h_path.dentry))
+ /* some filesystem calls d_drop() */
+ d_drop(dentry);
+ goto out_unpin; /* success */
+
+out_revert:
+ rerr = vfsub_unlink(au_pinned_h_dir(&a->pin), &a->h_path, /*force*/0);
+ if (unlikely(rerr)) {
+ AuIOErr("%.*s reverting failed(%d, %d)\n",
+ AuDLNPair(dentry), err, rerr);
+ err = -EIO;
+ }
+ au_dtime_revert(&dt);
+out_unpin:
+ au_unpin(&a->pin);
+out_wh:
+ dput(wh_dentry);
+out_parent:
+ di_write_unlock(a->parent);
+ dput(a->src_parent);
+out_unlock:
+ if (unlikely(err)) {
+ au_update_dbstart(dentry);
+ d_drop(dentry);
+ }
+ aufs_read_and_write_unlock2(dentry, src_dentry);
+out_kfree:
+ kfree(a);
+out:
+ return err;
+}
+
+int aufs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+{
+ int err, rerr;
+ aufs_bindex_t bindex;
+ unsigned char diropq;
+ struct path h_path;
+ struct dentry *wh_dentry, *parent, *opq_dentry;
+ struct mutex *h_mtx;
+ struct super_block *sb;
+ struct {
+ struct au_pin pin;
+ struct au_dtime dt;
+ } *a; /* reduce the stack usage */
+ struct au_wr_dir_args wr_dir_args = {
+ .force_btgt = -1,
+ .flags = AuWrDir_ADD_ENTRY | AuWrDir_ISDIR
+ };
+
+ IMustLock(dir);
+
+ err = -ENOMEM;
+ a = kmalloc(sizeof(*a), GFP_NOFS);
+ if (unlikely(!a))
+ goto out;
+
+ err = aufs_read_lock(dentry, AuLock_DW | AuLock_GEN);
+ if (unlikely(err))
+ goto out_free;
+ err = au_d_may_add(dentry);
+ if (unlikely(err))
+ goto out_unlock;
+
+ parent = dentry->d_parent; /* dir inode is locked */
+ di_write_lock_parent(parent);
+ wh_dentry = lock_hdir_lkup_wh(dentry, &a->dt, /*src_dentry*/NULL,
+ &a->pin, &wr_dir_args);
+ err = PTR_ERR(wh_dentry);
+ if (IS_ERR(wh_dentry))
+ goto out_parent;
+
+ sb = dentry->d_sb;
+ bindex = au_dbstart(dentry);
+ h_path.dentry = au_h_dptr(dentry, bindex);
+ h_path.mnt = au_sbr_mnt(sb, bindex);
+ err = vfsub_mkdir(au_pinned_h_dir(&a->pin), &h_path, mode);
+ if (unlikely(err))
+ goto out_unpin;
+
+ /* make the dir opaque */
+ diropq = 0;
+ h_mtx = &h_path.dentry->d_inode->i_mutex;
+ if (wh_dentry
+ || au_opt_test(au_mntflags(sb), ALWAYS_DIROPQ)) {
+ mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
+ opq_dentry = au_diropq_create(dentry, bindex);
+ mutex_unlock(h_mtx);
+ err = PTR_ERR(opq_dentry);
+ if (IS_ERR(opq_dentry))
+ goto out_dir;
+ dput(opq_dentry);
+ diropq = 1;
+ }
+
+ err = epilog(dir, bindex, wh_dentry, dentry);
+ if (!err) {
+ inc_nlink(dir);
+ goto out_unpin; /* success */
+ }
+
+ /* revert */
+ if (diropq) {
+ AuLabel(revert opq);
+ mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
+ rerr = au_diropq_remove(dentry, bindex);
+ mutex_unlock(h_mtx);
+ if (rerr) {
+ AuIOErr("%.*s reverting diropq failed(%d, %d)\n",
+ AuDLNPair(dentry), err, rerr);
+ err = -EIO;
+ }
+ }
+
+out_dir:
+ AuLabel(revert dir);
+ rerr = vfsub_rmdir(au_pinned_h_dir(&a->pin), &h_path);
+ if (rerr) {
+ AuIOErr("%.*s reverting dir failed(%d, %d)\n",
+ AuDLNPair(dentry), err, rerr);
+ err = -EIO;
+ }
+ au_dtime_revert(&a->dt);
+out_unpin:
+ au_unpin(&a->pin);
+ dput(wh_dentry);
+out_parent:
+ di_write_unlock(parent);
+out_unlock:
+ if (unlikely(err)) {
+ au_update_dbstart(dentry);
+ d_drop(dentry);
+ }
+ aufs_read_unlock(dentry, AuLock_DW);
+out_free:
+ kfree(a);
+out:
+ return err;
+}
diff -urN a/fs/aufs/i_op.c b/fs/aufs/i_op.c
--- a/fs/aufs/i_op.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/i_op.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,992 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * inode operations (except add/del/rename)
+ */
+
+#include <linux/device_cgroup.h>
+#include <linux/fs_stack.h>
+#include <linux/namei.h>
+#include <linux/security.h>
+#include "aufs.h"
+
+static int h_permission(struct inode *h_inode, int mask,
+ struct vfsmount *h_mnt, int brperm)
+{
+ int err;
+ const unsigned char write_mask = !!(mask & (MAY_WRITE | MAY_APPEND));
+
+ err = -EACCES;
+ if ((write_mask && IS_IMMUTABLE(h_inode))
+ || ((mask & MAY_EXEC)
+ && S_ISREG(h_inode->i_mode)
+ && ((h_mnt->mnt_flags & MNT_NOEXEC)
+ || !(h_inode->i_mode & S_IXUGO))))
+ goto out;
+
+ /*
+ * - skip the lower fs test in the case of write to ro branch.
+ * - nfs dir permission write check is optimized, but a policy for
+ * link/rename requires a real check.
+ */
+ if ((write_mask && !au_br_writable(brperm))
+ || (au_test_nfs(h_inode->i_sb) && S_ISDIR(h_inode->i_mode)
+ && write_mask && !(mask & MAY_READ))
+ || !h_inode->i_op->permission) {
+ /* AuLabel(generic_permission); */
+ err = generic_permission(h_inode, mask);
+ } else {
+ /* AuLabel(h_inode->permission); */
+ err = h_inode->i_op->permission(h_inode, mask);
+ AuTraceErr(err);
+ }
+
+ if (!err)
+ err = devcgroup_inode_permission(h_inode, mask);
+ if (!err)
+ err = security_inode_permission(h_inode, mask);
+
+#if 0
+ if (!err) {
+ /* todo: do we need to call ima_path_check()? */
+ struct path h_path = {
+ .dentry =
+ .mnt = h_mnt
+ };
+ err = ima_path_check(&h_path,
+ mask & (MAY_READ | MAY_WRITE | MAY_EXEC),
+ IMA_COUNT_LEAVE);
+ }
+#endif
+
+out:
+ return err;
+}
+
+static int aufs_permission(struct inode *inode, int mask)
+{
+ int err;
+ aufs_bindex_t bindex, bend;
+ const unsigned char isdir = !!S_ISDIR(inode->i_mode),
+ write_mask = !!(mask & (MAY_WRITE | MAY_APPEND));
+ struct inode *h_inode;
+ struct super_block *sb;
+ struct au_branch *br;
+
+ /* todo: support rcu-walk? */
+ if (mask & MAY_NOT_BLOCK)
+ return -ECHILD;
+
+ sb = inode->i_sb;
+ si_read_lock(sb, AuLock_FLUSH);
+ ii_read_lock_child(inode);
+#if 0
+ err = au_iigen_test(inode, au_sigen(sb));
+ if (unlikely(err))
+ goto out;
+#endif
+
+ if (!isdir || write_mask) {
+ err = au_busy_or_stale();
+ h_inode = au_h_iptr(inode, au_ibstart(inode));
+ if (unlikely(!h_inode
+ || (h_inode->i_mode & S_IFMT)
+ != (inode->i_mode & S_IFMT)))
+ goto out;
+
+ err = 0;
+ bindex = au_ibstart(inode);
+ br = au_sbr(sb, bindex);
+ err = h_permission(h_inode, mask, br->br_mnt, br->br_perm);
+ if (write_mask
+ && !err
+ && !special_file(h_inode->i_mode)) {
+ /* test whether the upper writable branch exists */
+ err = -EROFS;
+ for (; bindex >= 0; bindex--)
+ if (!au_br_rdonly(au_sbr(sb, bindex))) {
+ err = 0;
+ break;
+ }
+ }
+ goto out;
+ }
+
+ /* non-write to dir */
+ err = 0;
+ bend = au_ibend(inode);
+ for (bindex = au_ibstart(inode); !err && bindex <= bend; bindex++) {
+ h_inode = au_h_iptr(inode, bindex);
+ if (h_inode) {
+ err = au_busy_or_stale();
+ if (unlikely(!S_ISDIR(h_inode->i_mode)))
+ break;
+
+ br = au_sbr(sb, bindex);
+ err = h_permission(h_inode, mask, br->br_mnt,
+ br->br_perm);
+ }
+ }
+
+out:
+ ii_read_unlock(inode);
+ si_read_unlock(sb);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static struct dentry *aufs_lookup(struct inode *dir, struct dentry *dentry,
+ struct nameidata *nd)
+{
+ struct dentry *ret, *parent;
+ struct inode *inode;
+ struct super_block *sb;
+ int err, npositive, lc_idx;
+
+ IMustLock(dir);
+
+ sb = dir->i_sb;
+ err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM);
+ ret = ERR_PTR(err);
+ if (unlikely(err))
+ goto out;
+
+ ret = ERR_PTR(-ENAMETOOLONG);
+ if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN))
+ goto out_si;
+ err = au_di_init(dentry);
+ ret = ERR_PTR(err);
+ if (unlikely(err))
+ goto out_si;
+
+ inode = NULL;
+ npositive = 0; /* suppress a warning */
+ parent = dentry->d_parent; /* dir inode is locked */
+ di_read_lock_parent(parent, AuLock_IR);
+ err = au_alive_dir(parent);
+ if (!err)
+ err = au_digen_test(parent, au_sigen(sb));
+ if (!err) {
+ npositive = au_lkup_dentry(dentry, au_dbstart(parent),
+ /*type*/0, nd);
+ err = npositive;
+ }
+ di_read_unlock(parent, AuLock_IR);
+ ret = ERR_PTR(err);
+ if (unlikely(err < 0))
+ goto out_unlock;
+
+ if (npositive) {
+ inode = au_new_inode(dentry, /*must_new*/0);
+ ret = (void *)inode;
+ }
+ if (IS_ERR(inode)) {
+ inode = NULL;
+ goto out_unlock;
+ }
+
+ ret = d_splice_alias(inode, dentry);
+ if (unlikely(IS_ERR(ret) && inode)) {
+ ii_write_unlock(inode);
+ lc_idx = AuLcNonDir_IIINFO;
+ if (S_ISLNK(inode->i_mode))
+ lc_idx = AuLcSymlink_IIINFO;
+ else if (S_ISDIR(inode->i_mode))
+ lc_idx = AuLcDir_IIINFO;
+ au_rw_class(&au_ii(inode)->ii_rwsem, au_lc_key + lc_idx);
+ iput(inode);
+ }
+
+out_unlock:
+ di_write_unlock(dentry);
+ if (unlikely(IS_ERR(ret) && inode)) {
+ lc_idx = AuLcNonDir_DIINFO;
+ if (S_ISLNK(inode->i_mode))
+ lc_idx = AuLcSymlink_DIINFO;
+ else if (S_ISDIR(inode->i_mode))
+ lc_idx = AuLcDir_DIINFO;
+ au_rw_class(&au_di(dentry)->di_rwsem, au_lc_key + lc_idx);
+ }
+out_si:
+ si_read_unlock(sb);
+out:
+ return ret;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int au_wr_dir_cpup(struct dentry *dentry, struct dentry *parent,
+ const unsigned char add_entry, aufs_bindex_t bcpup,
+ aufs_bindex_t bstart)
+{
+ int err;
+ struct dentry *h_parent;
+ struct inode *h_dir;
+
+ if (add_entry)
+ IMustLock(parent->d_inode);
+ else
+ di_write_lock_parent(parent);
+
+ err = 0;
+ if (!au_h_dptr(parent, bcpup)) {
+ if (bstart < bcpup)
+ err = au_cpdown_dirs(dentry, bcpup);
+ else
+ err = au_cpup_dirs(dentry, bcpup);
+ }
+ if (!err && add_entry) {
+ h_parent = au_h_dptr(parent, bcpup);
+ h_dir = h_parent->d_inode;
+ mutex_lock_nested(&h_dir->i_mutex, AuLsc_I_PARENT);
+ err = au_lkup_neg(dentry, bcpup);
+ /* todo: no unlock here */
+ mutex_unlock(&h_dir->i_mutex);
+
+ AuDbg("bcpup %d\n", bcpup);
+ if (!err) {
+ if (!dentry->d_inode)
+ au_set_h_dptr(dentry, bstart, NULL);
+ au_update_dbrange(dentry, /*do_put_zero*/0);
+ }
+ }
+
+ if (!add_entry)
+ di_write_unlock(parent);
+ if (!err)
+ err = bcpup; /* success */
+
+ AuTraceErr(err);
+ return err;
+}
+
+/*
+ * decide the branch and the parent dir where we will create a new entry.
+ * returns new bindex or an error.
+ * copyup the parent dir if needed.
+ */
+int au_wr_dir(struct dentry *dentry, struct dentry *src_dentry,
+ struct au_wr_dir_args *args)
+{
+ int err;
+ aufs_bindex_t bcpup, bstart, src_bstart;
+ const unsigned char add_entry = !!au_ftest_wrdir(args->flags,
+ ADD_ENTRY);
+ struct super_block *sb;
+ struct dentry *parent;
+ struct au_sbinfo *sbinfo;
+
+ sb = dentry->d_sb;
+ sbinfo = au_sbi(sb);
+ parent = dget_parent(dentry);
+ bstart = au_dbstart(dentry);
+ bcpup = bstart;
+ if (args->force_btgt < 0) {
+ if (src_dentry) {
+ src_bstart = au_dbstart(src_dentry);
+ if (src_bstart < bstart)
+ bcpup = src_bstart;
+ } else if (add_entry) {
+ err = AuWbrCreate(sbinfo, dentry,
+ au_ftest_wrdir(args->flags, ISDIR));
+ bcpup = err;
+ }
+
+ if (bcpup < 0 || au_test_ro(sb, bcpup, dentry->d_inode)) {
+ if (add_entry)
+ err = AuWbrCopyup(sbinfo, dentry);
+ else {
+ if (!IS_ROOT(dentry)) {
+ di_read_lock_parent(parent, !AuLock_IR);
+ err = AuWbrCopyup(sbinfo, dentry);
+ di_read_unlock(parent, !AuLock_IR);
+ } else
+ err = AuWbrCopyup(sbinfo, dentry);
+ }
+ bcpup = err;
+ if (unlikely(err < 0))
+ goto out;
+ }
+ } else {
+ bcpup = args->force_btgt;
+ AuDebugOn(au_test_ro(sb, bcpup, dentry->d_inode));
+ }
+
+ AuDbg("bstart %d, bcpup %d\n", bstart, bcpup);
+ err = bcpup;
+ if (bcpup == bstart)
+ goto out; /* success */
+
+ /* copyup the new parent into the branch we process */
+ err = au_wr_dir_cpup(dentry, parent, add_entry, bcpup, bstart);
+ if (err >= 0) {
+ if (!dentry->d_inode) {
+ au_set_h_dptr(dentry, bstart, NULL);
+ au_set_dbstart(dentry, bcpup);
+ au_set_dbend(dentry, bcpup);
+ }
+ AuDebugOn(add_entry && !au_h_dptr(dentry, bcpup));
+ }
+
+out:
+ dput(parent);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct dentry *au_pinned_h_parent(struct au_pin *pin)
+{
+ if (pin && pin->parent)
+ return au_h_dptr(pin->parent, pin->bindex);
+ return NULL;
+}
+
+void au_unpin(struct au_pin *p)
+{
+ if (p->h_mnt && au_ftest_pin(p->flags, MNT_WRITE))
+ mnt_drop_write(p->h_mnt);
+ if (!p->hdir)
+ return;
+
+ au_hn_imtx_unlock(p->hdir);
+ if (!au_ftest_pin(p->flags, DI_LOCKED))
+ di_read_unlock(p->parent, AuLock_IR);
+ iput(p->hdir->hi_inode);
+ dput(p->parent);
+ p->parent = NULL;
+ p->hdir = NULL;
+ p->h_mnt = NULL;
+}
+
+int au_do_pin(struct au_pin *p)
+{
+ int err;
+ struct super_block *sb;
+ struct dentry *h_dentry, *h_parent;
+ struct au_branch *br;
+ struct inode *h_dir;
+
+ err = 0;
+ sb = p->dentry->d_sb;
+ br = au_sbr(sb, p->bindex);
+ if (IS_ROOT(p->dentry)) {
+ if (au_ftest_pin(p->flags, MNT_WRITE)) {
+ p->h_mnt = br->br_mnt;
+ err = mnt_want_write(p->h_mnt);
+ if (unlikely(err)) {
+ au_fclr_pin(p->flags, MNT_WRITE);
+ goto out_err;
+ }
+ }
+ goto out;
+ }
+
+ h_dentry = NULL;
+ if (p->bindex <= au_dbend(p->dentry))
+ h_dentry = au_h_dptr(p->dentry, p->bindex);
+
+ p->parent = dget_parent(p->dentry);
+ if (!au_ftest_pin(p->flags, DI_LOCKED))
+ di_read_lock(p->parent, AuLock_IR, p->lsc_di);
+
+ h_dir = NULL;
+ h_parent = au_h_dptr(p->parent, p->bindex);
+ p->hdir = au_hi(p->parent->d_inode, p->bindex);
+ if (p->hdir)
+ h_dir = p->hdir->hi_inode;
+
+ /*
+ * udba case, or
+ * if DI_LOCKED is not set, then p->parent may be different
+ * and h_parent can be NULL.
+ */
+ if (unlikely(!p->hdir || !h_dir || !h_parent)) {
+ err = -EBUSY;
+ if (!au_ftest_pin(p->flags, DI_LOCKED))
+ di_read_unlock(p->parent, AuLock_IR);
+ dput(p->parent);
+ p->parent = NULL;
+ goto out_err;
+ }
+
+ au_igrab(h_dir);
+ au_hn_imtx_lock_nested(p->hdir, p->lsc_hi);
+
+ if (unlikely(p->hdir->hi_inode != h_parent->d_inode)) {
+ err = -EBUSY;
+ goto out_unpin;
+ }
+ if (h_dentry) {
+ err = au_h_verify(h_dentry, p->udba, h_dir, h_parent, br);
+ if (unlikely(err)) {
+ au_fclr_pin(p->flags, MNT_WRITE);
+ goto out_unpin;
+ }
+ }
+
+ if (au_ftest_pin(p->flags, MNT_WRITE)) {
+ p->h_mnt = br->br_mnt;
+ err = mnt_want_write(p->h_mnt);
+ if (unlikely(err)) {
+ au_fclr_pin(p->flags, MNT_WRITE);
+ goto out_unpin;
+ }
+ }
+ goto out; /* success */
+
+out_unpin:
+ au_unpin(p);
+out_err:
+ pr_err("err %d\n", err);
+ err = au_busy_or_stale();
+out:
+ return err;
+}
+
+void au_pin_init(struct au_pin *p, struct dentry *dentry,
+ aufs_bindex_t bindex, int lsc_di, int lsc_hi,
+ unsigned int udba, unsigned char flags)
+{
+ p->dentry = dentry;
+ p->udba = udba;
+ p->lsc_di = lsc_di;
+ p->lsc_hi = lsc_hi;
+ p->flags = flags;
+ p->bindex = bindex;
+
+ p->parent = NULL;
+ p->hdir = NULL;
+ p->h_mnt = NULL;
+}
+
+int au_pin(struct au_pin *pin, struct dentry *dentry, aufs_bindex_t bindex,
+ unsigned int udba, unsigned char flags)
+{
+ au_pin_init(pin, dentry, bindex, AuLsc_DI_PARENT, AuLsc_I_PARENT2,
+ udba, flags);
+ return au_do_pin(pin);
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * ->setattr() and ->getattr() are called in various cases.
+ * chmod, stat: dentry is revalidated.
+ * fchmod, fstat: file and dentry are not revalidated, additionally they may be
+ * unhashed.
+ * for ->setattr(), ia->ia_file is passed from ftruncate only.
+ */
+/* todo: consolidate with do_refresh() and simple_reval_dpath() */
+static int au_reval_for_attr(struct dentry *dentry, unsigned int sigen)
+{
+ int err;
+ struct inode *inode;
+ struct dentry *parent;
+
+ err = 0;
+ inode = dentry->d_inode;
+ if (au_digen_test(dentry, sigen)) {
+ parent = dget_parent(dentry);
+ di_read_lock_parent(parent, AuLock_IR);
+ err = au_refresh_dentry(dentry, parent);
+ di_read_unlock(parent, AuLock_IR);
+ dput(parent);
+ }
+
+ AuTraceErr(err);
+ return err;
+}
+
+#define AuIcpup_DID_CPUP 1
+#define au_ftest_icpup(flags, name) ((flags) & AuIcpup_##name)
+#define au_fset_icpup(flags, name) \
+ do { (flags) |= AuIcpup_##name; } while (0)
+#define au_fclr_icpup(flags, name) \
+ do { (flags) &= ~AuIcpup_##name; } while (0)
+
+struct au_icpup_args {
+ unsigned char flags;
+ unsigned char pin_flags;
+ aufs_bindex_t btgt;
+ unsigned int udba;
+ struct au_pin pin;
+ struct path h_path;
+ struct inode *h_inode;
+};
+
+static int au_pin_and_icpup(struct dentry *dentry, struct iattr *ia,
+ struct au_icpup_args *a)
+{
+ int err;
+ loff_t sz;
+ aufs_bindex_t bstart, ibstart;
+ struct dentry *hi_wh, *parent;
+ struct inode *inode;
+ struct file *h_file;
+ struct au_wr_dir_args wr_dir_args = {
+ .force_btgt = -1,
+ .flags = 0
+ };
+
+ bstart = au_dbstart(dentry);
+ inode = dentry->d_inode;
+ if (S_ISDIR(inode->i_mode))
+ au_fset_wrdir(wr_dir_args.flags, ISDIR);
+ /* plink or hi_wh() case */
+ ibstart = au_ibstart(inode);
+ if (bstart != ibstart && !au_test_ro(inode->i_sb, ibstart, inode))
+ wr_dir_args.force_btgt = ibstart;
+ err = au_wr_dir(dentry, /*src_dentry*/NULL, &wr_dir_args);
+ if (unlikely(err < 0))
+ goto out;
+ a->btgt = err;
+ if (err != bstart)
+ au_fset_icpup(a->flags, DID_CPUP);
+
+ err = 0;
+ a->pin_flags = AuPin_MNT_WRITE;
+ parent = NULL;
+ if (!IS_ROOT(dentry)) {
+ au_fset_pin(a->pin_flags, DI_LOCKED);
+ parent = dget_parent(dentry);
+ di_write_lock_parent(parent);
+ }
+
+ err = au_pin(&a->pin, dentry, a->btgt, a->udba, a->pin_flags);
+ if (unlikely(err))
+ goto out_parent;
+
+ a->h_path.dentry = au_h_dptr(dentry, bstart);
+ a->h_inode = a->h_path.dentry->d_inode;
+ mutex_lock_nested(&a->h_inode->i_mutex, AuLsc_I_CHILD);
+ sz = -1;
+ if ((ia->ia_valid & ATTR_SIZE) && ia->ia_size < i_size_read(a->h_inode))
+ sz = ia->ia_size;
+
+ h_file = NULL;
+ hi_wh = NULL;
+ if (au_ftest_icpup(a->flags, DID_CPUP) && d_unlinked(dentry)) {
+ hi_wh = au_hi_wh(inode, a->btgt);
+ if (!hi_wh) {
+ err = au_sio_cpup_wh(dentry, a->btgt, sz, /*file*/NULL);
+ if (unlikely(err))
+ goto out_unlock;
+ hi_wh = au_hi_wh(inode, a->btgt);
+ /* todo: revalidate hi_wh? */
+ }
+ }
+
+ if (parent) {
+ au_pin_set_parent_lflag(&a->pin, /*lflag*/0);
+ di_downgrade_lock(parent, AuLock_IR);
+ dput(parent);
+ parent = NULL;
+ }
+ if (!au_ftest_icpup(a->flags, DID_CPUP))
+ goto out; /* success */
+
+ if (!d_unhashed(dentry)) {
+ h_file = au_h_open_pre(dentry, bstart);
+ if (IS_ERR(h_file)) {
+ err = PTR_ERR(h_file);
+ h_file = NULL;
+ } else
+ err = au_sio_cpup_simple(dentry, a->btgt, sz,
+ AuCpup_DTIME);
+ if (!err)
+ a->h_path.dentry = au_h_dptr(dentry, a->btgt);
+ } else if (!hi_wh)
+ a->h_path.dentry = au_h_dptr(dentry, a->btgt);
+ else
+ a->h_path.dentry = hi_wh; /* do not dget here */
+
+out_unlock:
+ mutex_unlock(&a->h_inode->i_mutex);
+ au_h_open_post(dentry, bstart, h_file);
+ a->h_inode = a->h_path.dentry->d_inode;
+ if (!err) {
+ mutex_lock_nested(&a->h_inode->i_mutex, AuLsc_I_CHILD);
+ goto out; /* success */
+ }
+
+ au_unpin(&a->pin);
+out_parent:
+ if (parent) {
+ di_write_unlock(parent);
+ dput(parent);
+ }
+out:
+ return err;
+}
+
+static int aufs_setattr(struct dentry *dentry, struct iattr *ia)
+{
+ int err;
+ struct inode *inode;
+ struct super_block *sb;
+ struct file *file;
+ struct au_icpup_args *a;
+
+ inode = dentry->d_inode;
+ IMustLock(inode);
+
+ err = -ENOMEM;
+ a = kzalloc(sizeof(*a), GFP_NOFS);
+ if (unlikely(!a))
+ goto out;
+
+ if (ia->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
+ ia->ia_valid &= ~ATTR_MODE;
+
+ file = NULL;
+ sb = dentry->d_sb;
+ err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM);
+ if (unlikely(err))
+ goto out_kfree;
+
+ if (ia->ia_valid & ATTR_FILE) {
+ /* currently ftruncate(2) only */
+ AuDebugOn(!S_ISREG(inode->i_mode));
+ file = ia->ia_file;
+ err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1);
+ if (unlikely(err))
+ goto out_si;
+ ia->ia_file = au_hf_top(file);
+ a->udba = AuOpt_UDBA_NONE;
+ } else {
+ /* fchmod() doesn't pass ia_file */
+ a->udba = au_opt_udba(sb);
+ di_write_lock_child(dentry);
+ /* no d_unlinked(), to set UDBA_NONE for root */
+ if (d_unhashed(dentry))
+ a->udba = AuOpt_UDBA_NONE;
+ if (a->udba != AuOpt_UDBA_NONE) {
+ AuDebugOn(IS_ROOT(dentry));
+ err = au_reval_for_attr(dentry, au_sigen(sb));
+ if (unlikely(err))
+ goto out_dentry;
+ }
+ }
+
+ err = au_pin_and_icpup(dentry, ia, a);
+ if (unlikely(err < 0))
+ goto out_dentry;
+ if (au_ftest_icpup(a->flags, DID_CPUP)) {
+ ia->ia_file = NULL;
+ ia->ia_valid &= ~ATTR_FILE;
+ }
+
+ a->h_path.mnt = au_sbr_mnt(sb, a->btgt);
+ if ((ia->ia_valid & (ATTR_MODE | ATTR_CTIME))
+ == (ATTR_MODE | ATTR_CTIME)) {
+ err = security_path_chmod(a->h_path.dentry, a->h_path.mnt,
+ ia->ia_mode);
+ if (unlikely(err))
+ goto out_unlock;
+ } else if ((ia->ia_valid & (ATTR_UID | ATTR_GID))
+ && (ia->ia_valid & ATTR_CTIME)) {
+ err = security_path_chown(&a->h_path, ia->ia_uid, ia->ia_gid);
+ if (unlikely(err))
+ goto out_unlock;
+ }
+
+ if (ia->ia_valid & ATTR_SIZE) {
+ struct file *f;
+
+ if (ia->ia_size < i_size_read(inode))
+ /* unmap only */
+ truncate_setsize(inode, ia->ia_size);
+
+ f = NULL;
+ if (ia->ia_valid & ATTR_FILE)
+ f = ia->ia_file;
+ mutex_unlock(&a->h_inode->i_mutex);
+ err = vfsub_trunc(&a->h_path, ia->ia_size, ia->ia_valid, f);
+ mutex_lock_nested(&a->h_inode->i_mutex, AuLsc_I_CHILD);
+ } else
+ err = vfsub_notify_change(&a->h_path, ia);
+ if (!err)
+ au_cpup_attr_changeable(inode);
+
+out_unlock:
+ mutex_unlock(&a->h_inode->i_mutex);
+ au_unpin(&a->pin);
+ if (unlikely(err))
+ au_update_dbstart(dentry);
+out_dentry:
+ di_write_unlock(dentry);
+ if (file) {
+ fi_write_unlock(file);
+ ia->ia_file = file;
+ ia->ia_valid |= ATTR_FILE;
+ }
+out_si:
+ si_read_unlock(sb);
+out_kfree:
+ kfree(a);
+out:
+ AuTraceErr(err);
+ return err;
+}
+
+static void au_refresh_iattr(struct inode *inode, struct kstat *st,
+ unsigned int nlink)
+{
+ unsigned int n;
+
+ inode->i_mode = st->mode;
+ inode->i_uid = st->uid;
+ inode->i_gid = st->gid;
+ inode->i_atime = st->atime;
+ inode->i_mtime = st->mtime;
+ inode->i_ctime = st->ctime;
+
+ au_cpup_attr_nlink(inode, /*force*/0);
+ if (S_ISDIR(inode->i_mode)) {
+ n = inode->i_nlink;
+ n -= nlink;
+ n += st->nlink;
+ set_nlink(inode, n);
+ }
+
+ spin_lock(&inode->i_lock);
+ inode->i_blocks = st->blocks;
+ i_size_write(inode, st->size);
+ spin_unlock(&inode->i_lock);
+}
+
+static int aufs_getattr(struct vfsmount *mnt __maybe_unused,
+ struct dentry *dentry, struct kstat *st)
+{
+ int err;
+ unsigned int mnt_flags;
+ aufs_bindex_t bindex;
+ unsigned char udba_none, positive;
+ struct super_block *sb, *h_sb;
+ struct inode *inode;
+ struct vfsmount *h_mnt;
+ struct dentry *h_dentry;
+
+ sb = dentry->d_sb;
+ inode = dentry->d_inode;
+ err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM);
+ if (unlikely(err))
+ goto out;
+ mnt_flags = au_mntflags(sb);
+ udba_none = !!au_opt_test(mnt_flags, UDBA_NONE);
+
+ /* support fstat(2) */
+ if (!d_unlinked(dentry) && !udba_none) {
+ unsigned int sigen = au_sigen(sb);
+ err = au_digen_test(dentry, sigen);
+ if (!err) {
+ di_read_lock_child(dentry, AuLock_IR);
+ err = au_dbrange_test(dentry);
+ if (unlikely(err))
+ goto out_unlock;
+ } else {
+ AuDebugOn(IS_ROOT(dentry));
+ di_write_lock_child(dentry);
+ err = au_dbrange_test(dentry);
+ if (!err)
+ err = au_reval_for_attr(dentry, sigen);
+ di_downgrade_lock(dentry, AuLock_IR);
+ if (unlikely(err))
+ goto out_unlock;
+ }
+ } else
+ di_read_lock_child(dentry, AuLock_IR);
+
+ bindex = au_ibstart(inode);
+ h_mnt = au_sbr_mnt(sb, bindex);
+ h_sb = h_mnt->mnt_sb;
+ if (!au_test_fs_bad_iattr(h_sb) && udba_none)
+ goto out_fill; /* success */
+
+ h_dentry = NULL;
+ if (au_dbstart(dentry) == bindex)
+ h_dentry = dget(au_h_dptr(dentry, bindex));
+ else if (au_opt_test(mnt_flags, PLINK) && au_plink_test(inode)) {
+ h_dentry = au_plink_lkup(inode, bindex);
+ if (IS_ERR(h_dentry))
+ goto out_fill; /* pretending success */
+ }
+ /* illegally overlapped or something */
+ if (unlikely(!h_dentry))
+ goto out_fill; /* pretending success */
+
+ positive = !!h_dentry->d_inode;
+ if (positive)
+ err = vfs_getattr(h_mnt, h_dentry, st);
+ dput(h_dentry);
+ if (!err) {
+ if (positive)
+ au_refresh_iattr(inode, st, h_dentry->d_inode->i_nlink);
+ goto out_fill; /* success */
+ }
+ AuTraceErr(err);
+ goto out_unlock;
+
+out_fill:
+ generic_fillattr(inode, st);
+out_unlock:
+ di_read_unlock(dentry, AuLock_IR);
+ si_read_unlock(sb);
+out:
+ AuTraceErr(err);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int h_readlink(struct dentry *dentry, int bindex, char __user *buf,
+ int bufsiz)
+{
+ int err;
+ struct super_block *sb;
+ struct dentry *h_dentry;
+
+ err = -EINVAL;
+ h_dentry = au_h_dptr(dentry, bindex);
+ if (unlikely(!h_dentry->d_inode->i_op->readlink))
+ goto out;
+
+ err = security_inode_readlink(h_dentry);
+ if (unlikely(err))
+ goto out;
+
+ sb = dentry->d_sb;
+ if (!au_test_ro(sb, bindex, dentry->d_inode)) {
+ vfsub_touch_atime(au_sbr_mnt(sb, bindex), h_dentry);
+ fsstack_copy_attr_atime(dentry->d_inode, h_dentry->d_inode);
+ }
+ err = h_dentry->d_inode->i_op->readlink(h_dentry, buf, bufsiz);
+
+out:
+ return err;
+}
+
+static int aufs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
+{
+ int err;
+
+ err = aufs_read_lock(dentry, AuLock_IR | AuLock_GEN);
+ if (unlikely(err))
+ goto out;
+ err = au_d_hashed_positive(dentry);
+ if (!err)
+ err = h_readlink(dentry, au_dbstart(dentry), buf, bufsiz);
+ aufs_read_unlock(dentry, AuLock_IR);
+
+out:
+ return err;
+}
+
+static void *aufs_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+ int err;
+ mm_segment_t old_fs;
+ union {
+ char *k;
+ char __user *u;
+ } buf;
+
+ err = -ENOMEM;
+ buf.k = __getname_gfp(GFP_NOFS);
+ if (unlikely(!buf.k))
+ goto out;
+
+ err = aufs_read_lock(dentry, AuLock_IR | AuLock_GEN);
+ if (unlikely(err))
+ goto out_name;
+
+ err = au_d_hashed_positive(dentry);
+ if (!err) {
+ old_fs = get_fs();
+ set_fs(KERNEL_DS);
+ err = h_readlink(dentry, au_dbstart(dentry), buf.u, PATH_MAX);
+ set_fs(old_fs);
+ }
+ aufs_read_unlock(dentry, AuLock_IR);
+
+ if (err >= 0) {
+ buf.k[err] = 0;
+ /* will be freed by put_link */
+ nd_set_link(nd, buf.k);
+ return NULL; /* success */
+ }
+
+out_name:
+ __putname(buf.k);
+out:
+ path_put(&nd->path);
+ AuTraceErr(err);
+ return ERR_PTR(err);
+}
+
+static void aufs_put_link(struct dentry *dentry __maybe_unused,
+ struct nameidata *nd, void *cookie __maybe_unused)
+{
+ __putname(nd_get_link(nd));
+}
+
+/* ---------------------------------------------------------------------- */
+
+static void aufs_truncate_range(struct inode *inode __maybe_unused,
+ loff_t start __maybe_unused,
+ loff_t end __maybe_unused)
+{
+ AuUnsupport();
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct inode_operations aufs_symlink_iop = {
+ .permission = aufs_permission,
+ .setattr = aufs_setattr,
+ .getattr = aufs_getattr,
+ .readlink = aufs_readlink,
+ .follow_link = aufs_follow_link,
+ .put_link = aufs_put_link
+};
+
+struct inode_operations aufs_dir_iop = {
+ .create = aufs_create,
+ .lookup = aufs_lookup,
+ .link = aufs_link,
+ .unlink = aufs_unlink,
+ .symlink = aufs_symlink,
+ .mkdir = aufs_mkdir,
+ .rmdir = aufs_rmdir,
+ .mknod = aufs_mknod,
+ .rename = aufs_rename,
+
+ .permission = aufs_permission,
+ .setattr = aufs_setattr,
+ .getattr = aufs_getattr
+};
+
+struct inode_operations aufs_iop = {
+ .permission = aufs_permission,
+ .setattr = aufs_setattr,
+ .getattr = aufs_getattr,
+ .truncate_range = aufs_truncate_range
+};
diff -urN a/fs/aufs/i_op_del.c b/fs/aufs/i_op_del.c
--- a/fs/aufs/i_op_del.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/i_op_del.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,478 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * inode operations (del entry)
+ */
+
+#include "aufs.h"
+
+/*
+ * decide if a new whiteout for @dentry is necessary or not.
+ * when it is necessary, prepare the parent dir for the upper branch whose
+ * branch index is @bcpup for creation. the actual creation of the whiteout will
+ * be done by caller.
+ * return value:
+ * 0: wh is unnecessary
+ * plus: wh is necessary
+ * minus: error
+ */
+int au_wr_dir_need_wh(struct dentry *dentry, int isdir, aufs_bindex_t *bcpup)
+{
+ int need_wh, err;
+ aufs_bindex_t bstart;
+ struct super_block *sb;
+
+ sb = dentry->d_sb;
+ bstart = au_dbstart(dentry);
+ if (*bcpup < 0) {
+ *bcpup = bstart;
+ if (au_test_ro(sb, bstart, dentry->d_inode)) {
+ err = AuWbrCopyup(au_sbi(sb), dentry);
+ *bcpup = err;
+ if (unlikely(err < 0))
+ goto out;
+ }
+ } else
+ AuDebugOn(bstart < *bcpup
+ || au_test_ro(sb, *bcpup, dentry->d_inode));
+ AuDbg("bcpup %d, bstart %d\n", *bcpup, bstart);
+
+ if (*bcpup != bstart) {
+ err = au_cpup_dirs(dentry, *bcpup);
+ if (unlikely(err))
+ goto out;
+ need_wh = 1;
+ } else {
+ struct au_dinfo *dinfo, *tmp;
+
+ need_wh = -ENOMEM;
+ dinfo = au_di(dentry);
+ tmp = au_di_alloc(sb, AuLsc_DI_TMP);
+ if (tmp) {
+ au_di_cp(tmp, dinfo);
+ au_di_swap(tmp, dinfo);
+ /* returns the number of positive dentries */
+ need_wh = au_lkup_dentry(dentry, bstart + 1, /*type*/0,
+ /*nd*/NULL);
+ au_di_swap(tmp, dinfo);
+ au_rw_write_unlock(&tmp->di_rwsem);
+ au_di_free(tmp);
+ }
+ }
+ AuDbg("need_wh %d\n", need_wh);
+ err = need_wh;
+
+out:
+ return err;
+}
+
+/*
+ * simple tests for the del-entry operations.
+ * following the checks in vfs, plus the parent-child relationship.
+ */
+int au_may_del(struct dentry *dentry, aufs_bindex_t bindex,
+ struct dentry *h_parent, int isdir)
+{
+ int err;
+ umode_t h_mode;
+ struct dentry *h_dentry, *h_latest;
+ struct inode *h_inode;
+
+ h_dentry = au_h_dptr(dentry, bindex);
+ h_inode = h_dentry->d_inode;
+ if (dentry->d_inode) {
+ err = -ENOENT;
+ if (unlikely(!h_inode || !h_inode->i_nlink))
+ goto out;
+
+ h_mode = h_inode->i_mode;
+ if (!isdir) {
+ err = -EISDIR;
+ if (unlikely(S_ISDIR(h_mode)))
+ goto out;
+ } else if (unlikely(!S_ISDIR(h_mode))) {
+ err = -ENOTDIR;
+ goto out;
+ }
+ } else {
+ /* rename(2) case */
+ err = -EIO;
+ if (unlikely(h_inode))
+ goto out;
+ }
+
+ err = -ENOENT;
+ /* expected parent dir is locked */
+ if (unlikely(h_parent != h_dentry->d_parent))
+ goto out;
+ err = 0;
+
+ /*
+ * rmdir a dir may break the consistency on some filesystem.
+ * let's try heavy test.
+ */
+ err = -EACCES;
+ if (unlikely(au_test_h_perm(h_parent->d_inode, MAY_EXEC | MAY_WRITE)))
+ goto out;
+
+ h_latest = au_sio_lkup_one(&dentry->d_name, h_parent,
+ au_sbr(dentry->d_sb, bindex));
+ err = -EIO;
+ if (IS_ERR(h_latest))
+ goto out;
+ if (h_latest == h_dentry)
+ err = 0;
+ dput(h_latest);
+
+out:
+ return err;
+}
+
+/*
+ * decide the branch where we operate for @dentry. the branch index will be set
+ * @rbcpup. after diciding it, 'pin' it and store the timestamps of the parent
+ * dir for reverting.
+ * when a new whiteout is necessary, create it.
+ */
+static struct dentry*
+lock_hdir_create_wh(struct dentry *dentry, int isdir, aufs_bindex_t *rbcpup,
+ struct au_dtime *dt, struct au_pin *pin)
+{
+ struct dentry *wh_dentry;
+ struct super_block *sb;
+ struct path h_path;
+ int err, need_wh;
+ unsigned int udba;
+ aufs_bindex_t bcpup;
+
+ need_wh = au_wr_dir_need_wh(dentry, isdir, rbcpup);
+ wh_dentry = ERR_PTR(need_wh);
+ if (unlikely(need_wh < 0))
+ goto out;
+
+ sb = dentry->d_sb;
+ udba = au_opt_udba(sb);
+ bcpup = *rbcpup;
+ err = au_pin(pin, dentry, bcpup, udba,
+ AuPin_DI_LOCKED | AuPin_MNT_WRITE);
+ wh_dentry = ERR_PTR(err);
+ if (unlikely(err))
+ goto out;
+
+ h_path.dentry = au_pinned_h_parent(pin);
+ if (udba != AuOpt_UDBA_NONE
+ && au_dbstart(dentry) == bcpup) {
+ err = au_may_del(dentry, bcpup, h_path.dentry, isdir);
+ wh_dentry = ERR_PTR(err);
+ if (unlikely(err))
+ goto out_unpin;
+ }
+
+ h_path.mnt = au_sbr_mnt(sb, bcpup);
+ au_dtime_store(dt, au_pinned_parent(pin), &h_path);
+ wh_dentry = NULL;
+ if (!need_wh)
+ goto out; /* success, no need to create whiteout */
+
+ wh_dentry = au_wh_create(dentry, bcpup, h_path.dentry);
+ if (IS_ERR(wh_dentry))
+ goto out_unpin;
+
+ /* returns with the parent is locked and wh_dentry is dget-ed */
+ goto out; /* success */
+
+out_unpin:
+ au_unpin(pin);
+out:
+ return wh_dentry;
+}
+
+/*
+ * when removing a dir, rename it to a unique temporary whiteout-ed name first
+ * in order to be revertible and save time for removing many child whiteouts
+ * under the dir.
+ * returns 1 when there are too many child whiteout and caller should remove
+ * them asynchronously. returns 0 when the number of children is enough small to
+ * remove now or the branch fs is a remote fs.
+ * otherwise return an error.
+ */
+static int renwh_and_rmdir(struct dentry *dentry, aufs_bindex_t bindex,
+ struct au_nhash *whlist, struct inode *dir)
+{
+ int rmdir_later, err, dirwh;
+ struct dentry *h_dentry;
+ struct super_block *sb;
+
+ sb = dentry->d_sb;
+ SiMustAnyLock(sb);
+ h_dentry = au_h_dptr(dentry, bindex);
+ err = au_whtmp_ren(h_dentry, au_sbr(sb, bindex));
+ if (unlikely(err))
+ goto out;
+
+ /* stop monitoring */
+ au_hn_free(au_hi(dentry->d_inode, bindex));
+
+ if (!au_test_fs_remote(h_dentry->d_sb)) {
+ dirwh = au_sbi(sb)->si_dirwh;
+ rmdir_later = (dirwh <= 1);
+ if (!rmdir_later)
+ rmdir_later = au_nhash_test_longer_wh(whlist, bindex,
+ dirwh);
+ if (rmdir_later)
+ return rmdir_later;
+ }
+
+ err = au_whtmp_rmdir(dir, bindex, h_dentry, whlist);
+ if (unlikely(err)) {
+ AuIOErr("rmdir %.*s, b%d failed, %d. ignored\n",
+ AuDLNPair(h_dentry), bindex, err);
+ err = 0;
+ }
+
+out:
+ AuTraceErr(err);
+ return err;
+}
+
+/*
+ * final procedure for deleting a entry.
+ * maintain dentry and iattr.
+ */
+static void epilog(struct inode *dir, struct dentry *dentry,
+ aufs_bindex_t bindex)
+{
+ struct inode *inode;
+
+ inode = dentry->d_inode;
+ d_drop(dentry);
+ inode->i_ctime = dir->i_ctime;
+
+ if (au_ibstart(dir) == bindex)
+ au_cpup_attr_timesizes(dir);
+ dir->i_version++;
+}
+
+/*
+ * when an error happened, remove the created whiteout and revert everything.
+ */
+static int do_revert(int err, struct inode *dir, aufs_bindex_t bindex,
+ aufs_bindex_t bwh, struct dentry *wh_dentry,
+ struct dentry *dentry, struct au_dtime *dt)
+{
+ int rerr;
+ struct path h_path = {
+ .dentry = wh_dentry,
+ .mnt = au_sbr_mnt(dir->i_sb, bindex)
+ };
+
+ rerr = au_wh_unlink_dentry(au_h_iptr(dir, bindex), &h_path, dentry);
+ if (!rerr) {
+ au_set_dbwh(dentry, bwh);
+ au_dtime_revert(dt);
+ return 0;
+ }
+
+ AuIOErr("%.*s reverting whiteout failed(%d, %d)\n",
+ AuDLNPair(dentry), err, rerr);
+ return -EIO;
+}
+
+/* ---------------------------------------------------------------------- */
+
+int aufs_unlink(struct inode *dir, struct dentry *dentry)
+{
+ int err;
+ aufs_bindex_t bwh, bindex, bstart;
+ struct au_dtime dt;
+ struct au_pin pin;
+ struct path h_path;
+ struct inode *inode, *h_dir;
+ struct dentry *parent, *wh_dentry;
+
+ IMustLock(dir);
+
+ err = aufs_read_lock(dentry, AuLock_DW | AuLock_GEN);
+ if (unlikely(err))
+ goto out;
+ err = au_d_hashed_positive(dentry);
+ if (unlikely(err))
+ goto out_unlock;
+ inode = dentry->d_inode;
+ IMustLock(inode);
+ err = -EISDIR;
+ if (unlikely(S_ISDIR(inode->i_mode)))
+ goto out_unlock; /* possible? */
+
+ bstart = au_dbstart(dentry);
+ bwh = au_dbwh(dentry);
+ bindex = -1;
+ parent = dentry->d_parent; /* dir inode is locked */
+ di_write_lock_parent(parent);
+ wh_dentry = lock_hdir_create_wh(dentry, /*isdir*/0, &bindex, &dt, &pin);
+ err = PTR_ERR(wh_dentry);
+ if (IS_ERR(wh_dentry))
+ goto out_parent;
+
+ h_path.mnt = au_sbr_mnt(dentry->d_sb, bstart);
+ h_path.dentry = au_h_dptr(dentry, bstart);
+ dget(h_path.dentry);
+ if (bindex == bstart) {
+ h_dir = au_pinned_h_dir(&pin);
+ err = vfsub_unlink(h_dir, &h_path, /*force*/0);
+ } else {
+ /* dir inode is locked */
+ h_dir = wh_dentry->d_parent->d_inode;
+ IMustLock(h_dir);
+ err = 0;
+ }
+
+ if (!err) {
+ vfsub_drop_nlink(inode);
+ epilog(dir, dentry, bindex);
+
+ /* update target timestamps */
+ if (bindex == bstart) {
+ vfsub_update_h_iattr(&h_path, /*did*/NULL); /*ignore*/
+ inode->i_ctime = h_path.dentry->d_inode->i_ctime;
+ } else
+ /* todo: this timestamp may be reverted later */
+ inode->i_ctime = h_dir->i_ctime;
+ goto out_unpin; /* success */
+ }
+
+ /* revert */
+ if (wh_dentry) {
+ int rerr;
+
+ rerr = do_revert(err, dir, bindex, bwh, wh_dentry, dentry, &dt);
+ if (rerr)
+ err = rerr;
+ }
+
+out_unpin:
+ au_unpin(&pin);
+ dput(wh_dentry);
+ dput(h_path.dentry);
+out_parent:
+ di_write_unlock(parent);
+out_unlock:
+ aufs_read_unlock(dentry, AuLock_DW);
+out:
+ return err;
+}
+
+int aufs_rmdir(struct inode *dir, struct dentry *dentry)
+{
+ int err, rmdir_later;
+ aufs_bindex_t bwh, bindex, bstart;
+ struct au_dtime dt;
+ struct au_pin pin;
+ struct inode *inode;
+ struct dentry *parent, *wh_dentry, *h_dentry;
+ struct au_whtmp_rmdir *args;
+
+ IMustLock(dir);
+
+ err = aufs_read_lock(dentry, AuLock_DW | AuLock_FLUSH | AuLock_GEN);
+ if (unlikely(err))
+ goto out;
+ err = au_alive_dir(dentry);
+ if (unlikely(err))
+ goto out_unlock;
+ inode = dentry->d_inode;
+ IMustLock(inode);
+ err = -ENOTDIR;
+ if (unlikely(!S_ISDIR(inode->i_mode)))
+ goto out_unlock; /* possible? */
+
+ err = -ENOMEM;
+ args = au_whtmp_rmdir_alloc(dir->i_sb, GFP_NOFS);
+ if (unlikely(!args))
+ goto out_unlock;
+
+ parent = dentry->d_parent; /* dir inode is locked */
+ di_write_lock_parent(parent);
+ err = au_test_empty(dentry, &args->whlist);
+ if (unlikely(err))
+ goto out_parent;
+
+ bstart = au_dbstart(dentry);
+ bwh = au_dbwh(dentry);
+ bindex = -1;
+ wh_dentry = lock_hdir_create_wh(dentry, /*isdir*/1, &bindex, &dt, &pin);
+ err = PTR_ERR(wh_dentry);
+ if (IS_ERR(wh_dentry))
+ goto out_parent;
+
+ h_dentry = au_h_dptr(dentry, bstart);
+ dget(h_dentry);
+ rmdir_later = 0;
+ if (bindex == bstart) {
+ err = renwh_and_rmdir(dentry, bstart, &args->whlist, dir);
+ if (err > 0) {
+ rmdir_later = err;
+ err = 0;
+ }
+ } else {
+ /* stop monitoring */
+ au_hn_free(au_hi(inode, bstart));
+
+ /* dir inode is locked */
+ IMustLock(wh_dentry->d_parent->d_inode);
+ err = 0;
+ }
+
+ if (!err) {
+ vfsub_dead_dir(inode);
+ au_set_dbdiropq(dentry, -1);
+ epilog(dir, dentry, bindex);
+
+ if (rmdir_later) {
+ au_whtmp_kick_rmdir(dir, bstart, h_dentry, args);
+ args = NULL;
+ }
+
+ goto out_unpin; /* success */
+ }
+
+ /* revert */
+ AuLabel(revert);
+ if (wh_dentry) {
+ int rerr;
+
+ rerr = do_revert(err, dir, bindex, bwh, wh_dentry, dentry, &dt);
+ if (rerr)
+ err = rerr;
+ }
+
+out_unpin:
+ au_unpin(&pin);
+ dput(wh_dentry);
+ dput(h_dentry);
+out_parent:
+ di_write_unlock(parent);
+ if (args)
+ au_whtmp_rmdir_free(args);
+out_unlock:
+ aufs_read_unlock(dentry, AuLock_DW);
+out:
+ AuTraceErr(err);
+ return err;
+}
diff -urN a/fs/aufs/i_op_ren.c b/fs/aufs/i_op_ren.c
--- a/fs/aufs/i_op_ren.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/i_op_ren.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,1017 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * inode operation (rename entry)
+ * todo: this is crazy monster
+ */
+
+#include "aufs.h"
+
+enum { AuSRC, AuDST, AuSrcDst };
+enum { AuPARENT, AuCHILD, AuParentChild };
+
+#define AuRen_ISDIR 1
+#define AuRen_ISSAMEDIR (1 << 1)
+#define AuRen_WHSRC (1 << 2)
+#define AuRen_WHDST (1 << 3)
+#define AuRen_MNT_WRITE (1 << 4)
+#define AuRen_DT_DSTDIR (1 << 5)
+#define AuRen_DIROPQ (1 << 6)
+#define AuRen_CPUP (1 << 7)
+#define au_ftest_ren(flags, name) ((flags) & AuRen_##name)
+#define au_fset_ren(flags, name) \
+ do { (flags) |= AuRen_##name; } while (0)
+#define au_fclr_ren(flags, name) \
+ do { (flags) &= ~AuRen_##name; } while (0)
+
+struct au_ren_args {
+ struct {
+ struct dentry *dentry, *h_dentry, *parent, *h_parent,
+ *wh_dentry;
+ struct inode *dir, *inode;
+ struct au_hinode *hdir;
+ struct au_dtime dt[AuParentChild];
+ aufs_bindex_t bstart;
+ } sd[AuSrcDst];
+
+#define src_dentry sd[AuSRC].dentry
+#define src_dir sd[AuSRC].dir
+#define src_inode sd[AuSRC].inode
+#define src_h_dentry sd[AuSRC].h_dentry
+#define src_parent sd[AuSRC].parent
+#define src_h_parent sd[AuSRC].h_parent
+#define src_wh_dentry sd[AuSRC].wh_dentry
+#define src_hdir sd[AuSRC].hdir
+#define src_h_dir sd[AuSRC].hdir->hi_inode
+#define src_dt sd[AuSRC].dt
+#define src_bstart sd[AuSRC].bstart
+
+#define dst_dentry sd[AuDST].dentry
+#define dst_dir sd[AuDST].dir
+#define dst_inode sd[AuDST].inode
+#define dst_h_dentry sd[AuDST].h_dentry
+#define dst_parent sd[AuDST].parent
+#define dst_h_parent sd[AuDST].h_parent
+#define dst_wh_dentry sd[AuDST].wh_dentry
+#define dst_hdir sd[AuDST].hdir
+#define dst_h_dir sd[AuDST].hdir->hi_inode
+#define dst_dt sd[AuDST].dt
+#define dst_bstart sd[AuDST].bstart
+
+ struct dentry *h_trap;
+ struct au_branch *br;
+ struct au_hinode *src_hinode;
+ struct path h_path;
+ struct au_nhash whlist;
+ aufs_bindex_t btgt, src_bwh, src_bdiropq;
+
+ unsigned int flags;
+
+ struct au_whtmp_rmdir *thargs;
+ struct dentry *h_dst;
+};
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * functions for reverting.
+ * when an error happened in a single rename systemcall, we should revert
+ * everything as if nothing happend.
+ * we don't need to revert the copied-up/down the parent dir since they are
+ * harmless.
+ */
+
+#define RevertFailure(fmt, ...) do { \
+ AuIOErr("revert failure: " fmt " (%d, %d)\n", \
+ ##__VA_ARGS__, err, rerr); \
+ err = -EIO; \
+} while (0)
+
+static void au_ren_rev_diropq(int err, struct au_ren_args *a)
+{
+ int rerr;
+
+ au_hn_imtx_lock_nested(a->src_hinode, AuLsc_I_CHILD);
+ rerr = au_diropq_remove(a->src_dentry, a->btgt);
+ au_hn_imtx_unlock(a->src_hinode);
+ au_set_dbdiropq(a->src_dentry, a->src_bdiropq);
+ if (rerr)
+ RevertFailure("remove diropq %.*s", AuDLNPair(a->src_dentry));
+}
+
+static void au_ren_rev_rename(int err, struct au_ren_args *a)
+{
+ int rerr;
+
+ a->h_path.dentry = au_lkup_one(&a->src_dentry->d_name, a->src_h_parent,
+ a->br, /*nd*/NULL);
+ rerr = PTR_ERR(a->h_path.dentry);
+ if (IS_ERR(a->h_path.dentry)) {
+ RevertFailure("au_lkup_one %.*s", AuDLNPair(a->src_dentry));
+ return;
+ }
+
+ rerr = vfsub_rename(a->dst_h_dir,
+ au_h_dptr(a->src_dentry, a->btgt),
+ a->src_h_dir, &a->h_path);
+ d_drop(a->h_path.dentry);
+ dput(a->h_path.dentry);
+ /* au_set_h_dptr(a->src_dentry, a->btgt, NULL); */
+ if (rerr)
+ RevertFailure("rename %.*s", AuDLNPair(a->src_dentry));
+}
+
+static void au_ren_rev_cpup(int err, struct au_ren_args *a)
+{
+ int rerr;
+
+ a->h_path.dentry = a->dst_h_dentry;
+ rerr = vfsub_unlink(a->dst_h_dir, &a->h_path, /*force*/0);
+ au_set_h_dptr(a->src_dentry, a->btgt, NULL);
+ au_set_dbstart(a->src_dentry, a->src_bstart);
+ if (rerr)
+ RevertFailure("unlink %.*s", AuDLNPair(a->dst_h_dentry));
+}
+
+static void au_ren_rev_whtmp(int err, struct au_ren_args *a)
+{
+ int rerr;
+
+ a->h_path.dentry = au_lkup_one(&a->dst_dentry->d_name, a->dst_h_parent,
+ a->br, /*nd*/NULL);
+ rerr = PTR_ERR(a->h_path.dentry);
+ if (IS_ERR(a->h_path.dentry)) {
+ RevertFailure("lookup %.*s", AuDLNPair(a->dst_dentry));
+ return;
+ }
+ if (a->h_path.dentry->d_inode) {
+ d_drop(a->h_path.dentry);
+ dput(a->h_path.dentry);
+ return;
+ }
+
+ rerr = vfsub_rename(a->dst_h_dir, a->h_dst, a->dst_h_dir, &a->h_path);
+ d_drop(a->h_path.dentry);
+ dput(a->h_path.dentry);
+ if (!rerr)
+ au_set_h_dptr(a->dst_dentry, a->btgt, dget(a->h_dst));
+ else
+ RevertFailure("rename %.*s", AuDLNPair(a->h_dst));
+}
+
+static void au_ren_rev_whsrc(int err, struct au_ren_args *a)
+{
+ int rerr;
+
+ a->h_path.dentry = a->src_wh_dentry;
+ rerr = au_wh_unlink_dentry(a->src_h_dir, &a->h_path, a->src_dentry);
+ au_set_dbwh(a->src_dentry, a->src_bwh);
+ if (rerr)
+ RevertFailure("unlink %.*s", AuDLNPair(a->src_wh_dentry));
+}
+#undef RevertFailure
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * when we have to copyup the renaming entry, do it with the rename-target name
+ * in order to minimize the cost (the later actual rename is unnecessary).
+ * otherwise rename it on the target branch.
+ */
+static int au_ren_or_cpup(struct au_ren_args *a)
+{
+ int err;
+ struct dentry *d;
+
+ d = a->src_dentry;
+ if (au_dbstart(d) == a->btgt) {
+ a->h_path.dentry = a->dst_h_dentry;
+ if (au_ftest_ren(a->flags, DIROPQ)
+ && au_dbdiropq(d) == a->btgt)
+ au_fclr_ren(a->flags, DIROPQ);
+ AuDebugOn(au_dbstart(d) != a->btgt);
+ err = vfsub_rename(a->src_h_dir, au_h_dptr(d, a->btgt),
+ a->dst_h_dir, &a->h_path);
+ } else {
+ struct mutex *h_mtx = &a->src_h_dentry->d_inode->i_mutex;
+ struct file *h_file;
+
+ au_fset_ren(a->flags, CPUP);
+ mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
+ au_set_dbstart(d, a->btgt);
+ au_set_h_dptr(d, a->btgt, dget(a->dst_h_dentry));
+ h_file = au_h_open_pre(d, a->src_bstart);
+ if (IS_ERR(h_file)) {
+ err = PTR_ERR(h_file);
+ h_file = NULL;
+ } else
+ err = au_sio_cpup_single(d, a->btgt, a->src_bstart, -1,
+ !AuCpup_DTIME, a->dst_parent);
+ mutex_unlock(h_mtx);
+ au_h_open_post(d, a->src_bstart, h_file);
+ if (!err) {
+ d = a->dst_dentry;
+ au_set_h_dptr(d, a->btgt, NULL);
+ au_update_dbstart(d);
+ } else {
+ au_set_h_dptr(d, a->btgt, NULL);
+ au_set_dbstart(d, a->src_bstart);
+ }
+ }
+ if (!err && a->h_dst)
+ /* it will be set to dinfo later */
+ dget(a->h_dst);
+
+ return err;
+}
+
+/* cf. aufs_rmdir() */
+static int au_ren_del_whtmp(struct au_ren_args *a)
+{
+ int err;
+ struct inode *dir;
+
+ dir = a->dst_dir;
+ SiMustAnyLock(dir->i_sb);
+ if (!au_nhash_test_longer_wh(&a->whlist, a->btgt,
+ au_sbi(dir->i_sb)->si_dirwh)
+ || au_test_fs_remote(a->h_dst->d_sb)) {
+ err = au_whtmp_rmdir(dir, a->btgt, a->h_dst, &a->whlist);
+ if (unlikely(err))
+ pr_warning("failed removing whtmp dir %.*s (%d), "
+ "ignored.\n", AuDLNPair(a->h_dst), err);
+ } else {
+ au_nhash_wh_free(&a->thargs->whlist);
+ a->thargs->whlist = a->whlist;
+ a->whlist.nh_num = 0;
+ au_whtmp_kick_rmdir(dir, a->btgt, a->h_dst, a->thargs);
+ dput(a->h_dst);
+ a->thargs = NULL;
+ }
+
+ return 0;
+}
+
+/* make it 'opaque' dir. */
+static int au_ren_diropq(struct au_ren_args *a)
+{
+ int err;
+ struct dentry *diropq;
+
+ err = 0;
+ a->src_bdiropq = au_dbdiropq(a->src_dentry);
+ a->src_hinode = au_hi(a->src_inode, a->btgt);
+ au_hn_imtx_lock_nested(a->src_hinode, AuLsc_I_CHILD);
+ diropq = au_diropq_create(a->src_dentry, a->btgt);
+ au_hn_imtx_unlock(a->src_hinode);
+ if (IS_ERR(diropq))
+ err = PTR_ERR(diropq);
+ dput(diropq);
+
+ return err;
+}
+
+static int do_rename(struct au_ren_args *a)
+{
+ int err;
+ struct dentry *d, *h_d;
+
+ /* prepare workqueue args for asynchronous rmdir */
+ h_d = a->dst_h_dentry;
+ if (au_ftest_ren(a->flags, ISDIR) && h_d->d_inode) {
+ err = -ENOMEM;
+ a->thargs = au_whtmp_rmdir_alloc(a->src_dentry->d_sb, GFP_NOFS);
+ if (unlikely(!a->thargs))
+ goto out;
+ a->h_dst = dget(h_d);
+ }
+
+ /* create whiteout for src_dentry */
+ if (au_ftest_ren(a->flags, WHSRC)) {
+ a->src_bwh = au_dbwh(a->src_dentry);
+ AuDebugOn(a->src_bwh >= 0);
+ a->src_wh_dentry
+ = au_wh_create(a->src_dentry, a->btgt, a->src_h_parent);
+ err = PTR_ERR(a->src_wh_dentry);
+ if (IS_ERR(a->src_wh_dentry))
+ goto out_thargs;
+ }
+
+ /* lookup whiteout for dentry */
+ if (au_ftest_ren(a->flags, WHDST)) {
+ h_d = au_wh_lkup(a->dst_h_parent, &a->dst_dentry->d_name,
+ a->br);
+ err = PTR_ERR(h_d);
+ if (IS_ERR(h_d))
+ goto out_whsrc;
+ if (!h_d->d_inode)
+ dput(h_d);
+ else
+ a->dst_wh_dentry = h_d;
+ }
+
+ /* rename dentry to tmpwh */
+ if (a->thargs) {
+ err = au_whtmp_ren(a->dst_h_dentry, a->br);
+ if (unlikely(err))
+ goto out_whdst;
+
+ d = a->dst_dentry;
+ au_set_h_dptr(d, a->btgt, NULL);
+ err = au_lkup_neg(d, a->btgt);
+ if (unlikely(err))
+ goto out_whtmp;
+ a->dst_h_dentry = au_h_dptr(d, a->btgt);
+ }
+
+ /* cpup src */
+ if (a->dst_h_dentry->d_inode && a->src_bstart != a->btgt) {
+ struct mutex *h_mtx = &a->src_h_dentry->d_inode->i_mutex;
+ struct file *h_file;
+
+ mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
+ AuDebugOn(au_dbstart(a->src_dentry) != a->src_bstart);
+ h_file = au_h_open_pre(a->src_dentry, a->src_bstart);
+ if (IS_ERR(h_file)) {
+ err = PTR_ERR(h_file);
+ h_file = NULL;
+ } else
+ err = au_sio_cpup_simple(a->src_dentry, a->btgt, -1,
+ !AuCpup_DTIME);
+ mutex_unlock(h_mtx);
+ au_h_open_post(a->src_dentry, a->src_bstart, h_file);
+ if (unlikely(err))
+ goto out_whtmp;
+ }
+
+ /* rename by vfs_rename or cpup */
+ d = a->dst_dentry;
+ if (au_ftest_ren(a->flags, ISDIR)
+ && (a->dst_wh_dentry
+ || au_dbdiropq(d) == a->btgt
+ /* hide the lower to keep xino */
+ || a->btgt < au_dbend(d)
+ || au_opt_test(au_mntflags(d->d_sb), ALWAYS_DIROPQ)))
+ au_fset_ren(a->flags, DIROPQ);
+ err = au_ren_or_cpup(a);
+ if (unlikely(err))
+ /* leave the copied-up one */
+ goto out_whtmp;
+
+ /* make dir opaque */
+ if (au_ftest_ren(a->flags, DIROPQ)) {
+ err = au_ren_diropq(a);
+ if (unlikely(err))
+ goto out_rename;
+ }
+
+ /* update target timestamps */
+ AuDebugOn(au_dbstart(a->src_dentry) != a->btgt);
+ a->h_path.dentry = au_h_dptr(a->src_dentry, a->btgt);
+ vfsub_update_h_iattr(&a->h_path, /*did*/NULL); /*ignore*/
+ a->src_inode->i_ctime = a->h_path.dentry->d_inode->i_ctime;
+
+ /* remove whiteout for dentry */
+ if (a->dst_wh_dentry) {
+ a->h_path.dentry = a->dst_wh_dentry;
+ err = au_wh_unlink_dentry(a->dst_h_dir, &a->h_path,
+ a->dst_dentry);
+ if (unlikely(err))
+ goto out_diropq;
+ }
+
+ /* remove whtmp */
+ if (a->thargs)
+ au_ren_del_whtmp(a); /* ignore this error */
+
+ err = 0;
+ goto out_success;
+
+out_diropq:
+ if (au_ftest_ren(a->flags, DIROPQ))
+ au_ren_rev_diropq(err, a);
+out_rename:
+ if (!au_ftest_ren(a->flags, CPUP))
+ au_ren_rev_rename(err, a);
+ else
+ au_ren_rev_cpup(err, a);
+ dput(a->h_dst);
+out_whtmp:
+ if (a->thargs)
+ au_ren_rev_whtmp(err, a);
+out_whdst:
+ dput(a->dst_wh_dentry);
+ a->dst_wh_dentry = NULL;
+out_whsrc:
+ if (a->src_wh_dentry)
+ au_ren_rev_whsrc(err, a);
+out_success:
+ dput(a->src_wh_dentry);
+ dput(a->dst_wh_dentry);
+out_thargs:
+ if (a->thargs) {
+ dput(a->h_dst);
+ au_whtmp_rmdir_free(a->thargs);
+ a->thargs = NULL;
+ }
+out:
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * test if @dentry dir can be rename destination or not.
+ * success means, it is a logically empty dir.
+ */
+static int may_rename_dstdir(struct dentry *dentry, struct au_nhash *whlist)
+{
+ return au_test_empty(dentry, whlist);
+}
+
+/*
+ * test if @dentry dir can be rename source or not.
+ * if it can, return 0 and @children is filled.
+ * success means,
+ * - it is a logically empty dir.
+ * - or, it exists on writable branch and has no children including whiteouts
+ * on the lower branch.
+ */
+static int may_rename_srcdir(struct dentry *dentry, aufs_bindex_t btgt)
+{
+ int err;
+ unsigned int rdhash;
+ aufs_bindex_t bstart;
+
+ bstart = au_dbstart(dentry);
+ if (bstart != btgt) {
+ struct au_nhash whlist;
+
+ SiMustAnyLock(dentry->d_sb);
+ rdhash = au_sbi(dentry->d_sb)->si_rdhash;
+ if (!rdhash)
+ rdhash = au_rdhash_est(au_dir_size(/*file*/NULL,
+ dentry));
+ err = au_nhash_alloc(&whlist, rdhash, GFP_NOFS);
+ if (unlikely(err))
+ goto out;
+ err = au_test_empty(dentry, &whlist);
+ au_nhash_wh_free(&whlist);
+ goto out;
+ }
+
+ if (bstart == au_dbtaildir(dentry))
+ return 0; /* success */
+
+ err = au_test_empty_lower(dentry);
+
+out:
+ if (err == -ENOTEMPTY) {
+ AuWarn1("renaming dir who has child(ren) on multiple branches,"
+ " is not supported\n");
+ err = -EXDEV;
+ }
+ return err;
+}
+
+/* side effect: sets whlist and h_dentry */
+static int au_ren_may_dir(struct au_ren_args *a)
+{
+ int err;
+ unsigned int rdhash;
+ struct dentry *d;
+
+ d = a->dst_dentry;
+ SiMustAnyLock(d->d_sb);
+
+ err = 0;
+ if (au_ftest_ren(a->flags, ISDIR) && a->dst_inode) {
+ rdhash = au_sbi(d->d_sb)->si_rdhash;
+ if (!rdhash)
+ rdhash = au_rdhash_est(au_dir_size(/*file*/NULL, d));
+ err = au_nhash_alloc(&a->whlist, rdhash, GFP_NOFS);
+ if (unlikely(err))
+ goto out;
+
+ au_set_dbstart(d, a->dst_bstart);
+ err = may_rename_dstdir(d, &a->whlist);
+ au_set_dbstart(d, a->btgt);
+ }
+ a->dst_h_dentry = au_h_dptr(d, au_dbstart(d));
+ if (unlikely(err))
+ goto out;
+
+ d = a->src_dentry;
+ a->src_h_dentry = au_h_dptr(d, au_dbstart(d));
+ if (au_ftest_ren(a->flags, ISDIR)) {
+ err = may_rename_srcdir(d, a->btgt);
+ if (unlikely(err)) {
+ au_nhash_wh_free(&a->whlist);
+ a->whlist.nh_num = 0;
+ }
+ }
+out:
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * simple tests for rename.
+ * following the checks in vfs, plus the parent-child relationship.
+ */
+static int au_may_ren(struct au_ren_args *a)
+{
+ int err, isdir;
+ struct inode *h_inode;
+
+ if (a->src_bstart == a->btgt) {
+ err = au_may_del(a->src_dentry, a->btgt, a->src_h_parent,
+ au_ftest_ren(a->flags, ISDIR));
+ if (unlikely(err))
+ goto out;
+ err = -EINVAL;
+ if (unlikely(a->src_h_dentry == a->h_trap))
+ goto out;
+ }
+
+ err = 0;
+ if (a->dst_bstart != a->btgt)
+ goto out;
+
+ err = -ENOTEMPTY;
+ if (unlikely(a->dst_h_dentry == a->h_trap))
+ goto out;
+
+ err = -EIO;
+ h_inode = a->dst_h_dentry->d_inode;
+ isdir = !!au_ftest_ren(a->flags, ISDIR);
+ if (!a->dst_dentry->d_inode) {
+ if (unlikely(h_inode))
+ goto out;
+ err = au_may_add(a->dst_dentry, a->btgt, a->dst_h_parent,
+ isdir);
+ } else {
+ if (unlikely(!h_inode || !h_inode->i_nlink))
+ goto out;
+ err = au_may_del(a->dst_dentry, a->btgt, a->dst_h_parent,
+ isdir);
+ if (unlikely(err))
+ goto out;
+ }
+
+out:
+ if (unlikely(err == -ENOENT || err == -EEXIST))
+ err = -EIO;
+ AuTraceErr(err);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * locking order
+ * (VFS)
+ * - src_dir and dir by lock_rename()
+ * - inode if exitsts
+ * (aufs)
+ * - lock all
+ * + src_dentry and dentry by aufs_read_and_write_lock2() which calls,
+ * + si_read_lock
+ * + di_write_lock2_child()
+ * + di_write_lock_child()
+ * + ii_write_lock_child()
+ * + di_write_lock_child2()
+ * + ii_write_lock_child2()
+ * + src_parent and parent
+ * + di_write_lock_parent()
+ * + ii_write_lock_parent()
+ * + di_write_lock_parent2()
+ * + ii_write_lock_parent2()
+ * + lower src_dir and dir by vfsub_lock_rename()
+ * + verify the every relationships between child and parent. if any
+ * of them failed, unlock all and return -EBUSY.
+ */
+static void au_ren_unlock(struct au_ren_args *a)
+{
+ struct super_block *sb;
+
+ sb = a->dst_dentry->d_sb;
+ if (au_ftest_ren(a->flags, MNT_WRITE))
+ mnt_drop_write(a->br->br_mnt);
+ vfsub_unlock_rename(a->src_h_parent, a->src_hdir,
+ a->dst_h_parent, a->dst_hdir);
+}
+
+static int au_ren_lock(struct au_ren_args *a)
+{
+ int err;
+ unsigned int udba;
+
+ err = 0;
+ a->src_h_parent = au_h_dptr(a->src_parent, a->btgt);
+ a->src_hdir = au_hi(a->src_dir, a->btgt);
+ a->dst_h_parent = au_h_dptr(a->dst_parent, a->btgt);
+ a->dst_hdir = au_hi(a->dst_dir, a->btgt);
+ a->h_trap = vfsub_lock_rename(a->src_h_parent, a->src_hdir,
+ a->dst_h_parent, a->dst_hdir);
+ udba = au_opt_udba(a->src_dentry->d_sb);
+ if (unlikely(a->src_hdir->hi_inode != a->src_h_parent->d_inode
+ || a->dst_hdir->hi_inode != a->dst_h_parent->d_inode))
+ err = au_busy_or_stale();
+ if (!err && au_dbstart(a->src_dentry) == a->btgt)
+ err = au_h_verify(a->src_h_dentry, udba,
+ a->src_h_parent->d_inode, a->src_h_parent,
+ a->br);
+ if (!err && au_dbstart(a->dst_dentry) == a->btgt)
+ err = au_h_verify(a->dst_h_dentry, udba,
+ a->dst_h_parent->d_inode, a->dst_h_parent,
+ a->br);
+ if (!err) {
+ err = mnt_want_write(a->br->br_mnt);
+ if (unlikely(err))
+ goto out_unlock;
+ au_fset_ren(a->flags, MNT_WRITE);
+ goto out; /* success */
+ }
+
+ err = au_busy_or_stale();
+
+out_unlock:
+ au_ren_unlock(a);
+out:
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static void au_ren_refresh_dir(struct au_ren_args *a)
+{
+ struct inode *dir;
+
+ dir = a->dst_dir;
+ dir->i_version++;
+ if (au_ftest_ren(a->flags, ISDIR)) {
+ /* is this updating defined in POSIX? */
+ au_cpup_attr_timesizes(a->src_inode);
+ au_cpup_attr_nlink(dir, /*force*/1);
+ }
+
+ if (au_ibstart(dir) == a->btgt)
+ au_cpup_attr_timesizes(dir);
+
+ if (au_ftest_ren(a->flags, ISSAMEDIR))
+ return;
+
+ dir = a->src_dir;
+ dir->i_version++;
+ if (au_ftest_ren(a->flags, ISDIR))
+ au_cpup_attr_nlink(dir, /*force*/1);
+ if (au_ibstart(dir) == a->btgt)
+ au_cpup_attr_timesizes(dir);
+}
+
+static void au_ren_refresh(struct au_ren_args *a)
+{
+ aufs_bindex_t bend, bindex;
+ struct dentry *d, *h_d;
+ struct inode *i, *h_i;
+ struct super_block *sb;
+
+ d = a->dst_dentry;
+ d_drop(d);
+ if (a->h_dst)
+ /* already dget-ed by au_ren_or_cpup() */
+ au_set_h_dptr(d, a->btgt, a->h_dst);
+
+ i = a->dst_inode;
+ if (i) {
+ if (!au_ftest_ren(a->flags, ISDIR))
+ vfsub_drop_nlink(i);
+ else {
+ vfsub_dead_dir(i);
+ au_cpup_attr_timesizes(i);
+ }
+ au_update_dbrange(d, /*do_put_zero*/1);
+ } else {
+ bend = a->btgt;
+ for (bindex = au_dbstart(d); bindex < bend; bindex++)
+ au_set_h_dptr(d, bindex, NULL);
+ bend = au_dbend(d);
+ for (bindex = a->btgt + 1; bindex <= bend; bindex++)
+ au_set_h_dptr(d, bindex, NULL);
+ au_update_dbrange(d, /*do_put_zero*/0);
+ }
+
+ d = a->src_dentry;
+ au_set_dbwh(d, -1);
+ bend = au_dbend(d);
+ for (bindex = a->btgt + 1; bindex <= bend; bindex++) {
+ h_d = au_h_dptr(d, bindex);
+ if (h_d)
+ au_set_h_dptr(d, bindex, NULL);
+ }
+ au_set_dbend(d, a->btgt);
+
+ sb = d->d_sb;
+ i = a->src_inode;
+ if (au_opt_test(au_mntflags(sb), PLINK) && au_plink_test(i))
+ return; /* success */
+
+ bend = au_ibend(i);
+ for (bindex = a->btgt + 1; bindex <= bend; bindex++) {
+ h_i = au_h_iptr(i, bindex);
+ if (h_i) {
+ au_xino_write(sb, bindex, h_i->i_ino, /*ino*/0);
+ /* ignore this error */
+ au_set_h_iptr(i, bindex, NULL, 0);
+ }
+ }
+ au_set_ibend(i, a->btgt);
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* mainly for link(2) and rename(2) */
+int au_wbr(struct dentry *dentry, aufs_bindex_t btgt)
+{
+ aufs_bindex_t bdiropq, bwh;
+ struct dentry *parent;
+ struct au_branch *br;
+
+ parent = dentry->d_parent;
+ IMustLock(parent->d_inode); /* dir is locked */
+
+ bdiropq = au_dbdiropq(parent);
+ bwh = au_dbwh(dentry);
+ br = au_sbr(dentry->d_sb, btgt);
+ if (au_br_rdonly(br)
+ || (0 <= bdiropq && bdiropq < btgt)
+ || (0 <= bwh && bwh < btgt))
+ btgt = -1;
+
+ AuDbg("btgt %d\n", btgt);
+ return btgt;
+}
+
+/* sets src_bstart, dst_bstart and btgt */
+static int au_ren_wbr(struct au_ren_args *a)
+{
+ int err;
+ struct au_wr_dir_args wr_dir_args = {
+ /* .force_btgt = -1, */
+ .flags = AuWrDir_ADD_ENTRY
+ };
+
+ a->src_bstart = au_dbstart(a->src_dentry);
+ a->dst_bstart = au_dbstart(a->dst_dentry);
+ if (au_ftest_ren(a->flags, ISDIR))
+ au_fset_wrdir(wr_dir_args.flags, ISDIR);
+ wr_dir_args.force_btgt = a->src_bstart;
+ if (a->dst_inode && a->dst_bstart < a->src_bstart)
+ wr_dir_args.force_btgt = a->dst_bstart;
+ wr_dir_args.force_btgt = au_wbr(a->dst_dentry, wr_dir_args.force_btgt);
+ err = au_wr_dir(a->dst_dentry, a->src_dentry, &wr_dir_args);
+ a->btgt = err;
+
+ return err;
+}
+
+static void au_ren_dt(struct au_ren_args *a)
+{
+ a->h_path.dentry = a->src_h_parent;
+ au_dtime_store(a->src_dt + AuPARENT, a->src_parent, &a->h_path);
+ if (!au_ftest_ren(a->flags, ISSAMEDIR)) {
+ a->h_path.dentry = a->dst_h_parent;
+ au_dtime_store(a->dst_dt + AuPARENT, a->dst_parent, &a->h_path);
+ }
+
+ au_fclr_ren(a->flags, DT_DSTDIR);
+ if (!au_ftest_ren(a->flags, ISDIR))
+ return;
+
+ a->h_path.dentry = a->src_h_dentry;
+ au_dtime_store(a->src_dt + AuCHILD, a->src_dentry, &a->h_path);
+ if (a->dst_h_dentry->d_inode) {
+ au_fset_ren(a->flags, DT_DSTDIR);
+ a->h_path.dentry = a->dst_h_dentry;
+ au_dtime_store(a->dst_dt + AuCHILD, a->dst_dentry, &a->h_path);
+ }
+}
+
+static void au_ren_rev_dt(int err, struct au_ren_args *a)
+{
+ struct dentry *h_d;
+ struct mutex *h_mtx;
+
+ au_dtime_revert(a->src_dt + AuPARENT);
+ if (!au_ftest_ren(a->flags, ISSAMEDIR))
+ au_dtime_revert(a->dst_dt + AuPARENT);
+
+ if (au_ftest_ren(a->flags, ISDIR) && err != -EIO) {
+ h_d = a->src_dt[AuCHILD].dt_h_path.dentry;
+ h_mtx = &h_d->d_inode->i_mutex;
+ mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
+ au_dtime_revert(a->src_dt + AuCHILD);
+ mutex_unlock(h_mtx);
+
+ if (au_ftest_ren(a->flags, DT_DSTDIR)) {
+ h_d = a->dst_dt[AuCHILD].dt_h_path.dentry;
+ h_mtx = &h_d->d_inode->i_mutex;
+ mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
+ au_dtime_revert(a->dst_dt + AuCHILD);
+ mutex_unlock(h_mtx);
+ }
+ }
+}
+
+/* ---------------------------------------------------------------------- */
+
+int aufs_rename(struct inode *_src_dir, struct dentry *_src_dentry,
+ struct inode *_dst_dir, struct dentry *_dst_dentry)
+{
+ int err, flags;
+ /* reduce stack space */
+ struct au_ren_args *a;
+
+ AuDbg("%.*s, %.*s\n", AuDLNPair(_src_dentry), AuDLNPair(_dst_dentry));
+ IMustLock(_src_dir);
+ IMustLock(_dst_dir);
+
+ err = -ENOMEM;
+ BUILD_BUG_ON(sizeof(*a) > PAGE_SIZE);
+ a = kzalloc(sizeof(*a), GFP_NOFS);
+ if (unlikely(!a))
+ goto out;
+
+ a->src_dir = _src_dir;
+ a->src_dentry = _src_dentry;
+ a->src_inode = a->src_dentry->d_inode;
+ a->src_parent = a->src_dentry->d_parent; /* dir inode is locked */
+ a->dst_dir = _dst_dir;
+ a->dst_dentry = _dst_dentry;
+ a->dst_inode = a->dst_dentry->d_inode;
+ a->dst_parent = a->dst_dentry->d_parent; /* dir inode is locked */
+ if (a->dst_inode) {
+ IMustLock(a->dst_inode);
+ au_igrab(a->dst_inode);
+ }
+
+ err = -ENOTDIR;
+ flags = AuLock_FLUSH | AuLock_NOPLM | AuLock_GEN;
+ if (S_ISDIR(a->src_inode->i_mode)) {
+ au_fset_ren(a->flags, ISDIR);
+ if (unlikely(a->dst_inode && !S_ISDIR(a->dst_inode->i_mode)))
+ goto out_free;
+ err = aufs_read_and_write_lock2(a->dst_dentry, a->src_dentry,
+ AuLock_DIR | flags);
+ } else
+ err = aufs_read_and_write_lock2(a->dst_dentry, a->src_dentry,
+ flags);
+ if (unlikely(err))
+ goto out_free;
+
+ err = au_d_hashed_positive(a->src_dentry);
+ if (unlikely(err))
+ goto out_unlock;
+ err = -ENOENT;
+ if (a->dst_inode) {
+ /*
+ * If it is a dir, VFS unhash dst_dentry before this
+ * function. It means we cannot rely upon d_unhashed().
+ */
+ if (unlikely(!a->dst_inode->i_nlink))
+ goto out_unlock;
+ if (!S_ISDIR(a->dst_inode->i_mode)) {
+ err = au_d_hashed_positive(a->dst_dentry);
+ if (unlikely(err))
+ goto out_unlock;
+ } else if (unlikely(IS_DEADDIR(a->dst_inode)))
+ goto out_unlock;
+ } else if (unlikely(d_unhashed(a->dst_dentry)))
+ goto out_unlock;
+
+ au_fset_ren(a->flags, ISSAMEDIR); /* temporary */
+ di_write_lock_parent(a->dst_parent);
+
+ /* which branch we process */
+ err = au_ren_wbr(a);
+ if (unlikely(err < 0))
+ goto out_parent;
+ a->br = au_sbr(a->dst_dentry->d_sb, a->btgt);
+ a->h_path.mnt = a->br->br_mnt;
+
+ /* are they available to be renamed */
+ err = au_ren_may_dir(a);
+ if (unlikely(err))
+ goto out_children;
+
+ /* prepare the writable parent dir on the same branch */
+ if (a->dst_bstart == a->btgt) {
+ au_fset_ren(a->flags, WHDST);
+ } else {
+ err = au_cpup_dirs(a->dst_dentry, a->btgt);
+ if (unlikely(err))
+ goto out_children;
+ }
+
+ if (a->src_dir != a->dst_dir) {
+ /*
+ * this temporary unlock is safe,
+ * because both dir->i_mutex are locked.
+ */
+ di_write_unlock(a->dst_parent);
+ di_write_lock_parent(a->src_parent);
+ err = au_wr_dir_need_wh(a->src_dentry,
+ au_ftest_ren(a->flags, ISDIR),
+ &a->btgt);
+ di_write_unlock(a->src_parent);
+ di_write_lock2_parent(a->src_parent, a->dst_parent, /*isdir*/1);
+ au_fclr_ren(a->flags, ISSAMEDIR);
+ } else
+ err = au_wr_dir_need_wh(a->src_dentry,
+ au_ftest_ren(a->flags, ISDIR),
+ &a->btgt);
+ if (unlikely(err < 0))
+ goto out_children;
+ if (err)
+ au_fset_ren(a->flags, WHSRC);
+
+ /* lock them all */
+ err = au_ren_lock(a);
+ if (unlikely(err))
+ goto out_children;
+
+ if (!au_opt_test(au_mntflags(a->dst_dir->i_sb), UDBA_NONE))
+ err = au_may_ren(a);
+ else if (unlikely(a->dst_dentry->d_name.len > AUFS_MAX_NAMELEN))
+ err = -ENAMETOOLONG;
+ if (unlikely(err))
+ goto out_hdir;
+
+ /* store timestamps to be revertible */
+ au_ren_dt(a);
+
+ /* here we go */
+ err = do_rename(a);
+ if (unlikely(err))
+ goto out_dt;
+
+ /* update dir attributes */
+ au_ren_refresh_dir(a);
+
+ /* dput/iput all lower dentries */
+ au_ren_refresh(a);
+
+ goto out_hdir; /* success */
+
+out_dt:
+ au_ren_rev_dt(err, a);
+out_hdir:
+ au_ren_unlock(a);
+out_children:
+ au_nhash_wh_free(&a->whlist);
+ if (err && a->dst_inode && a->dst_bstart != a->btgt) {
+ AuDbg("bstart %d, btgt %d\n", a->dst_bstart, a->btgt);
+ au_set_h_dptr(a->dst_dentry, a->btgt, NULL);
+ au_set_dbstart(a->dst_dentry, a->dst_bstart);
+ }
+out_parent:
+ if (!err)
+ d_move(a->src_dentry, a->dst_dentry);
+ else {
+ au_update_dbstart(a->dst_dentry);
+ if (!a->dst_inode)
+ d_drop(a->dst_dentry);
+ }
+ if (au_ftest_ren(a->flags, ISSAMEDIR))
+ di_write_unlock(a->dst_parent);
+ else
+ di_write_unlock2(a->src_parent, a->dst_parent);
+out_unlock:
+ aufs_read_and_write_unlock2(a->dst_dentry, a->src_dentry);
+out_free:
+ iput(a->dst_inode);
+ if (a->thargs)
+ au_whtmp_rmdir_free(a->thargs);
+ kfree(a);
+out:
+ AuTraceErr(err);
+ return err;
+}
diff -urN a/fs/aufs/Kconfig b/fs/aufs/Kconfig
--- a/fs/aufs/Kconfig 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/Kconfig 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,203 @@
+config AUFS_FS
+ tristate "Aufs (Advanced multi layered unification filesystem) support"
+ depends on EXPERIMENTAL
+ help
+ Aufs is a stackable unification filesystem such as Unionfs,
+ which unifies several directories and provides a merged single
+ directory.
+ In the early days, aufs was entirely re-designed and
+ re-implemented Unionfs Version 1.x series. Introducing many
+ original ideas, approaches and improvements, it becomes totally
+ different from Unionfs while keeping the basic features.
+
+if AUFS_FS
+choice
+ prompt "Maximum number of branches"
+ default AUFS_BRANCH_MAX_127
+ help
+ Specifies the maximum number of branches (or member directories)
+ in a single aufs. The larger value consumes more system
+ resources and has a minor impact to performance.
+config AUFS_BRANCH_MAX_127
+ bool "127"
+ help
+ Specifies the maximum number of branches (or member directories)
+ in a single aufs. The larger value consumes more system
+ resources and has a minor impact to performance.
+config AUFS_BRANCH_MAX_511
+ bool "511"
+ help
+ Specifies the maximum number of branches (or member directories)
+ in a single aufs. The larger value consumes more system
+ resources and has a minor impact to performance.
+config AUFS_BRANCH_MAX_1023
+ bool "1023"
+ help
+ Specifies the maximum number of branches (or member directories)
+ in a single aufs. The larger value consumes more system
+ resources and has a minor impact to performance.
+config AUFS_BRANCH_MAX_32767
+ bool "32767"
+ help
+ Specifies the maximum number of branches (or member directories)
+ in a single aufs. The larger value consumes more system
+ resources and has a minor impact to performance.
+endchoice
+
+config AUFS_SBILIST
+ bool
+ depends on AUFS_MAGIC_SYSRQ || PROC_FS
+ default y
+ help
+ Automatic configuration for internal use.
+ When aufs supports Magic SysRq or /proc, enabled automatically.
+
+config AUFS_HNOTIFY
+ bool "Detect direct branch access (bypassing aufs)"
+ help
+ If you want to modify files on branches directly, eg. bypassing aufs,
+ and want aufs to detect the changes of them fully, then enable this
+ option and use 'udba=notify' mount option.
+ Currently there is only one available configuration, "fsnotify".
+ It will have a negative impact to the performance.
+ See detail in aufs.5.
+
+choice
+ prompt "method" if AUFS_HNOTIFY
+ default AUFS_HFSNOTIFY
+config AUFS_HFSNOTIFY
+ bool "fsnotify"
+ select FSNOTIFY
+endchoice
+
+config AUFS_EXPORT
+ bool "NFS-exportable aufs"
+ depends on EXPORTFS
+ help
+ If you want to export your mounted aufs via NFS, then enable this
+ option. There are several requirements for this configuration.
+ See detail in aufs.5.
+
+config AUFS_INO_T_64
+ bool
+ depends on AUFS_EXPORT
+ depends on 64BIT && !(ALPHA || S390)
+ default y
+ help
+ Automatic configuration for internal use.
+ /* typedef unsigned long/int __kernel_ino_t */
+ /* alpha and s390x are int */
+
+config AUFS_RDU
+ bool "Readdir in userspace"
+ help
+ Aufs has two methods to provide a merged view for a directory,
+ by a user-space library and by kernel-space natively. The latter
+ is always enabled but sometimes large and slow.
+ If you enable this option, install the library in aufs2-util
+ package, and set some environment variables for your readdir(3),
+ then the work will be handled in user-space which generally
+ shows better performance in most cases.
+ See detail in aufs.5.
+
+config AUFS_PROC_MAP
+ bool "support for /proc/maps and lsof(1)"
+ depends on PROC_FS
+ help
+ When you issue mmap(2) in aufs, it is actually a direct mmap(2)
+ call to the file on the branch fs since the file in aufs is
+ purely virtual. And the file path printed in /proc/maps (and
+ others) will be the path on the branch fs. In most cases, it
+ does no harm. But some utilities like lsof(1) may confuse since
+ the utility or user may expect the file path in aufs to be
+ printed.
+ To address this issue, aufs provides a patch which introduces a
+ new member called vm_prfile into struct vm_are_struct. The patch
+ is meaningless without enabling this configuration since nobody
+ sets the new vm_prfile member.
+ If you don't apply the patch, then enabling this configuration
+ will cause a compile error.
+ This approach is fragile since if someone else make some changes
+ around vm_file, then vm_prfile may not work anymore. As a
+ workaround such case, aufs provides this configuration. If you
+ disable it, then lsof(1) may produce incorrect result but the
+ problem will be gone even if the aufs patch is applied (I hope).
+
+config AUFS_SP_IATTR
+ bool "Respect the attributes (mtime/ctime mainly) of special files"
+ help
+ When you write something to a special file, some attributes of it
+ (mtime/ctime mainly) may be updated. Generally such updates are
+ less important (actually some device drivers and NFS ignore
+ it). But some applications (such like test program) requires
+ such updates. If you need these updates, then enable this
+ configuration which introduces some overhead.
+ Currently this configuration handles FIFO only.
+
+config AUFS_SHWH
+ bool "Show whiteouts"
+ help
+ If you want to make the whiteouts in aufs visible, then enable
+ this option and specify 'shwh' mount option. Although it may
+ sounds like philosophy or something, but in technically it
+ simply shows the name of whiteout with keeping its behaviour.
+
+config AUFS_BR_RAMFS
+ bool "Ramfs (initramfs/rootfs) as an aufs branch"
+ help
+ If you want to use ramfs as an aufs branch fs, then enable this
+ option. Generally tmpfs is recommended.
+ Aufs prohibited them to be a branch fs by default, because
+ initramfs becomes unusable after switch_root or something
+ generally. If you sets initramfs as an aufs branch and boot your
+ system by switch_root, you will meet a problem easily since the
+ files in initramfs may be inaccessible.
+ Unless you are going to use ramfs as an aufs branch fs without
+ switch_root or something, leave it N.
+
+config AUFS_BR_FUSE
+ bool "Fuse fs as an aufs branch"
+ depends on FUSE_FS
+ select AUFS_POLL
+ help
+ If you want to use fuse-based userspace filesystem as an aufs
+ branch fs, then enable this option.
+ It implements the internal poll(2) operation which is
+ implemented by fuse only (curretnly).
+
+config AUFS_POLL
+ bool
+ help
+ Automatic configuration for internal use.
+
+config AUFS_BR_HFSPLUS
+ bool "Hfsplus as an aufs branch"
+ depends on HFSPLUS_FS
+ default y
+ help
+ If you want to use hfsplus fs as an aufs branch fs, then enable
+ this option. This option introduces a small overhead at
+ copying-up a file on hfsplus.
+
+config AUFS_BDEV_LOOP
+ bool
+ depends on BLK_DEV_LOOP
+ default y
+ help
+ Automatic configuration for internal use.
+ Convert =[ym] into =y.
+
+config AUFS_DEBUG
+ bool "Debug aufs"
+ help
+ Enable this to compile aufs internal debug code.
+ It will have a negative impact to the performance.
+
+config AUFS_MAGIC_SYSRQ
+ bool
+ depends on AUFS_DEBUG && MAGIC_SYSRQ
+ default y
+ help
+ Automatic configuration for internal use.
+ When aufs supports Magic SysRq, enabled automatically.
+endif
diff -urN a/fs/aufs/loop.c b/fs/aufs/loop.c
--- a/fs/aufs/loop.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/loop.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,133 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * support for loopback block device as a branch
+ */
+
+#include <linux/loop.h>
+#include "aufs.h"
+
+/*
+ * test if two lower dentries have overlapping branches.
+ */
+int au_test_loopback_overlap(struct super_block *sb, struct dentry *h_adding)
+{
+ struct super_block *h_sb;
+ struct loop_device *l;
+
+ h_sb = h_adding->d_sb;
+ if (MAJOR(h_sb->s_dev) != LOOP_MAJOR)
+ return 0;
+
+ l = h_sb->s_bdev->bd_disk->private_data;
+ h_adding = l->lo_backing_file->f_dentry;
+ /*
+ * h_adding can be local NFS.
+ * in this case aufs cannot detect the loop.
+ */
+ if (unlikely(h_adding->d_sb == sb))
+ return 1;
+ return !!au_test_subdir(h_adding, sb->s_root);
+}
+
+/* true if a kernel thread named 'loop[0-9].*' accesses a file */
+int au_test_loopback_kthread(void)
+{
+ int ret;
+ struct task_struct *tsk = current;
+
+ ret = 0;
+ if (tsk->flags & PF_KTHREAD) {
+ const char c = tsk->comm[4];
+ ret = ('0' <= c && c <= '9'
+ && !strncmp(tsk->comm, "loop", 4));
+ }
+
+ return ret;
+}
+
+/* ---------------------------------------------------------------------- */
+
+#define au_warn_loopback_step 16
+static int au_warn_loopback_nelem = au_warn_loopback_step;
+static unsigned long *au_warn_loopback_array;
+
+void au_warn_loopback(struct super_block *h_sb)
+{
+ int i, new_nelem;
+ unsigned long *a, magic;
+ static DEFINE_SPINLOCK(spin);
+
+ magic = h_sb->s_magic;
+ spin_lock(&spin);
+ a = au_warn_loopback_array;
+ for (i = 0; i < au_warn_loopback_nelem && *a; i++)
+ if (a[i] == magic) {
+ spin_unlock(&spin);
+ return;
+ }
+
+ /* h_sb is new to us, print it */
+ if (i < au_warn_loopback_nelem) {
+ a[i] = magic;
+ goto pr;
+ }
+
+ /* expand the array */
+ new_nelem = au_warn_loopback_nelem + au_warn_loopback_step;
+ a = au_kzrealloc(au_warn_loopback_array,
+ au_warn_loopback_nelem * sizeof(unsigned long),
+ new_nelem * sizeof(unsigned long), GFP_ATOMIC);
+ if (a) {
+ au_warn_loopback_nelem = new_nelem;
+ au_warn_loopback_array = a;
+ a[i] = magic;
+ goto pr;
+ }
+
+ spin_unlock(&spin);
+ AuWarn1("realloc failed, ignored\n");
+ return;
+
+pr:
+ spin_unlock(&spin);
+ pr_warning("you may want to try another patch for loopback file "
+ "on %s(0x%lx) branch\n", au_sbtype(h_sb), magic);
+}
+
+int au_loopback_init(void)
+{
+ int err;
+ struct super_block *sb __maybe_unused;
+
+ AuDebugOn(sizeof(sb->s_magic) != sizeof(unsigned long));
+
+ err = 0;
+ au_warn_loopback_array = kcalloc(au_warn_loopback_step,
+ sizeof(unsigned long), GFP_NOFS);
+ if (unlikely(!au_warn_loopback_array))
+ err = -ENOMEM;
+
+ return err;
+}
+
+void au_loopback_fin(void)
+{
+ kfree(au_warn_loopback_array);
+}
diff -urN a/fs/aufs/loop.h b/fs/aufs/loop.h
--- a/fs/aufs/loop.h 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/loop.h 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * support for loopback mount as a branch
+ */
+
+#ifndef __AUFS_LOOP_H__
+#define __AUFS_LOOP_H__
+
+#ifdef __KERNEL__
+
+struct dentry;
+struct super_block;
+
+#ifdef CONFIG_AUFS_BDEV_LOOP
+/* loop.c */
+int au_test_loopback_overlap(struct super_block *sb, struct dentry *h_adding);
+int au_test_loopback_kthread(void);
+void au_warn_loopback(struct super_block *h_sb);
+
+int au_loopback_init(void);
+void au_loopback_fin(void);
+#else
+AuStubInt0(au_test_loopback_overlap, struct super_block *sb,
+ struct dentry *h_adding)
+AuStubInt0(au_test_loopback_kthread, void)
+AuStubVoid(au_warn_loopback, struct super_block *h_sb)
+
+AuStubInt0(au_loopback_init, void)
+AuStubVoid(au_loopback_fin, void)
+#endif /* BLK_DEV_LOOP */
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_LOOP_H__ */
diff -urN a/fs/aufs/magic.mk b/fs/aufs/magic.mk
--- a/fs/aufs/magic.mk 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/magic.mk 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,54 @@
+
+# defined in ${srctree}/fs/fuse/inode.c
+# tristate
+ifdef CONFIG_FUSE_FS
+ccflags-y += -DFUSE_SUPER_MAGIC=0x65735546
+endif
+
+# defined in ${srctree}/fs/ocfs2/ocfs2_fs.h
+# tristate
+ifdef CONFIG_OCFS2_FS
+ccflags-y += -DOCFS2_SUPER_MAGIC=0x7461636f
+endif
+
+# defined in ${srctree}/fs/ocfs2/dlm/userdlm.h
+# tristate
+ifdef CONFIG_OCFS2_FS_O2CB
+ccflags-y += -DDLMFS_MAGIC=0x76a9f425
+endif
+
+# defined in ${srctree}/fs/cifs/cifsfs.c
+# tristate
+ifdef CONFIG_CIFS_FS
+ccflags-y += -DCIFS_MAGIC_NUMBER=0xFF534D42
+endif
+
+# defined in ${srctree}/fs/xfs/xfs_sb.h
+# tristate
+ifdef CONFIG_XFS_FS
+ccflags-y += -DXFS_SB_MAGIC=0x58465342
+endif
+
+# defined in ${srctree}/fs/configfs/mount.c
+# tristate
+ifdef CONFIG_CONFIGFS_FS
+ccflags-y += -DCONFIGFS_MAGIC=0x62656570
+endif
+
+# defined in ${srctree}/fs/9p/v9fs.h
+# tristate
+ifdef CONFIG_9P_FS
+ccflags-y += -DV9FS_MAGIC=0x01021997
+endif
+
+# defined in ${srctree}/fs/ubifs/ubifs.h
+# tristate
+ifdef CONFIG_UBIFS_FS
+ccflags-y += -DUBIFS_SUPER_MAGIC=0x24051905
+endif
+
+# defined in ${srctree}/fs/hfsplus/hfsplus_raw.h
+# tristate
+ifdef CONFIG_HFSPLUS_FS
+ccflags-y += -DHFSPLUS_SUPER_MAGIC=0x482b
+endif
diff -urN a/fs/aufs/Makefile b/fs/aufs/Makefile
--- a/fs/aufs/Makefile 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/Makefile 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,42 @@
+
+include ${src}/magic.mk
+ifeq (${CONFIG_AUFS_FS},m)
+include ${src}/conf.mk
+endif
+-include ${src}/priv_def.mk
+
+# cf. include/linux/kernel.h
+# enable pr_debug
+ccflags-y += -DDEBUG
+# sparse requires the full pathname
+ifdef M
+ccflags-y += -include ${M}/../../include/linux/aufs_type.h
+else
+ccflags-y += -include ${srctree}/include/linux/aufs_type.h
+endif
+
+obj-$(CONFIG_AUFS_FS) += aufs.o
+aufs-y := module.o sbinfo.o super.o branch.o xino.o sysaufs.o opts.o \
+ wkq.o vfsub.o dcsub.o \
+ cpup.o whout.o wbr_policy.o \
+ dinfo.o dentry.o \
+ dynop.o \
+ finfo.o file.o f_op.o \
+ dir.o vdir.o \
+ iinfo.o inode.o i_op.o i_op_add.o i_op_del.o i_op_ren.o \
+ ioctl.o
+
+# all are boolean
+aufs-$(CONFIG_PROC_FS) += procfs.o plink.o
+aufs-$(CONFIG_SYSFS) += sysfs.o
+aufs-$(CONFIG_DEBUG_FS) += dbgaufs.o
+aufs-$(CONFIG_AUFS_BDEV_LOOP) += loop.o
+aufs-$(CONFIG_AUFS_HNOTIFY) += hnotify.o
+aufs-$(CONFIG_AUFS_HFSNOTIFY) += hfsnotify.o
+aufs-$(CONFIG_AUFS_EXPORT) += export.o
+aufs-$(CONFIG_AUFS_POLL) += poll.o
+aufs-$(CONFIG_AUFS_RDU) += rdu.o
+aufs-$(CONFIG_AUFS_SP_IATTR) += f_op_sp.o
+aufs-$(CONFIG_AUFS_BR_HFSPLUS) += hfsplus.o
+aufs-$(CONFIG_AUFS_DEBUG) += debug.o
+aufs-$(CONFIG_AUFS_MAGIC_SYSRQ) += sysrq.o
diff -urN a/fs/aufs/module.c b/fs/aufs/module.c
--- a/fs/aufs/module.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/module.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,195 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * module global variables and operations
+ */
+
+#include <linux/module.h>
+#include <linux/seq_file.h>
+#include "aufs.h"
+
+void *au_kzrealloc(void *p, unsigned int nused, unsigned int new_sz, gfp_t gfp)
+{
+ if (new_sz <= nused)
+ return p;
+
+ p = krealloc(p, new_sz, gfp);
+ if (p)
+ memset(p + nused, 0, new_sz - nused);
+ return p;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * aufs caches
+ */
+struct kmem_cache *au_cachep[AuCache_Last];
+static int __init au_cache_init(void)
+{
+ au_cachep[AuCache_DINFO] = AuCacheCtor(au_dinfo, au_di_init_once);
+ if (au_cachep[AuCache_DINFO])
+ /* SLAB_DESTROY_BY_RCU */
+ au_cachep[AuCache_ICNTNR] = AuCacheCtor(au_icntnr,
+ au_icntnr_init_once);
+ if (au_cachep[AuCache_ICNTNR])
+ au_cachep[AuCache_FINFO] = AuCacheCtor(au_finfo,
+ au_fi_init_once);
+ if (au_cachep[AuCache_FINFO])
+ au_cachep[AuCache_VDIR] = AuCache(au_vdir);
+ if (au_cachep[AuCache_VDIR])
+ au_cachep[AuCache_DEHSTR] = AuCache(au_vdir_dehstr);
+ if (au_cachep[AuCache_DEHSTR])
+ return 0;
+
+ return -ENOMEM;
+}
+
+static void au_cache_fin(void)
+{
+ int i;
+
+ /* including AuCache_HNOTIFY */
+ for (i = 0; i < AuCache_Last; i++)
+ if (au_cachep[i]) {
+ kmem_cache_destroy(au_cachep[i]);
+ au_cachep[i] = NULL;
+ }
+}
+
+/* ---------------------------------------------------------------------- */
+
+int au_dir_roflags;
+
+#ifdef CONFIG_AUFS_SBILIST
+/*
+ * iterate_supers_type() doesn't protect us from
+ * remounting (branch management)
+ */
+struct au_splhead au_sbilist;
+#endif
+
+struct lock_class_key au_lc_key[AuLcKey_Last];
+
+/*
+ * functions for module interface.
+ */
+MODULE_LICENSE("GPL");
+/* MODULE_LICENSE("GPL v2"); */
+MODULE_AUTHOR("Junjiro R. Okajima <aufs-users@lists.sourceforge.net>");
+MODULE_DESCRIPTION(AUFS_NAME
+ " -- Advanced multi layered unification filesystem");
+MODULE_VERSION(AUFS_VERSION);
+
+/* this module parameter has no meaning when SYSFS is disabled */
+int sysaufs_brs = 1;
+MODULE_PARM_DESC(brs, "use <sysfs>/fs/aufs/si_*/brN");
+module_param_named(brs, sysaufs_brs, int, S_IRUGO);
+
+/* ---------------------------------------------------------------------- */
+
+static char au_esc_chars[0x20 + 3]; /* 0x01-0x20, backslash, del, and NULL */
+
+int au_seq_path(struct seq_file *seq, struct path *path)
+{
+ return seq_path(seq, path, au_esc_chars);
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int __init aufs_init(void)
+{
+ int err, i;
+ char *p;
+
+ p = au_esc_chars;
+ for (i = 1; i <= ' '; i++)
+ *p++ = i;
+ *p++ = '\\';
+ *p++ = '\x7f';
+ *p = 0;
+
+ au_dir_roflags = au_file_roflags(O_DIRECTORY | O_LARGEFILE);
+
+ au_sbilist_init();
+ sysaufs_brs_init();
+ au_debug_init();
+ au_dy_init();
+ err = sysaufs_init();
+ if (unlikely(err))
+ goto out;
+ err = au_procfs_init();
+ if (unlikely(err))
+ goto out_sysaufs;
+ err = au_wkq_init();
+ if (unlikely(err))
+ goto out_procfs;
+ err = au_loopback_init();
+ if (unlikely(err))
+ goto out_wkq;
+ err = au_hnotify_init();
+ if (unlikely(err))
+ goto out_loopback;
+ err = au_sysrq_init();
+ if (unlikely(err))
+ goto out_hin;
+ err = au_cache_init();
+ if (unlikely(err))
+ goto out_sysrq;
+ err = register_filesystem(&aufs_fs_type);
+ if (unlikely(err))
+ goto out_cache;
+ /* since we define pr_fmt, call printk directly */
+ printk(KERN_INFO AUFS_NAME " " AUFS_VERSION "\n");
+ goto out; /* success */
+
+out_cache:
+ au_cache_fin();
+out_sysrq:
+ au_sysrq_fin();
+out_hin:
+ au_hnotify_fin();
+out_loopback:
+ au_loopback_fin();
+out_wkq:
+ au_wkq_fin();
+out_procfs:
+ au_procfs_fin();
+out_sysaufs:
+ sysaufs_fin();
+ au_dy_fin();
+out:
+ return err;
+}
+
+static void __exit aufs_exit(void)
+{
+ unregister_filesystem(&aufs_fs_type);
+ au_cache_fin();
+ au_sysrq_fin();
+ au_hnotify_fin();
+ au_loopback_fin();
+ au_wkq_fin();
+ au_procfs_fin();
+ sysaufs_fin();
+ au_dy_fin();
+}
+
+module_init(aufs_init);
+module_exit(aufs_exit);
diff -urN a/fs/aufs/module.h b/fs/aufs/module.h
--- a/fs/aufs/module.h 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/module.h 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * module initialization and module-global
+ */
+
+#ifndef __AUFS_MODULE_H__
+#define __AUFS_MODULE_H__
+
+#ifdef __KERNEL__
+
+#include <linux/slab.h>
+
+struct path;
+struct seq_file;
+
+/* module parameters */
+extern int sysaufs_brs;
+
+/* ---------------------------------------------------------------------- */
+
+extern int au_dir_roflags;
+
+enum {
+ AuLcNonDir_FIINFO,
+ AuLcNonDir_DIINFO,
+ AuLcNonDir_IIINFO,
+
+ AuLcDir_FIINFO,
+ AuLcDir_DIINFO,
+ AuLcDir_IIINFO,
+
+ AuLcSymlink_DIINFO,
+ AuLcSymlink_IIINFO,
+
+ AuLcKey_Last
+};
+extern struct lock_class_key au_lc_key[AuLcKey_Last];
+
+void *au_kzrealloc(void *p, unsigned int nused, unsigned int new_sz, gfp_t gfp);
+int au_seq_path(struct seq_file *seq, struct path *path);
+
+#ifdef CONFIG_PROC_FS
+/* procfs.c */
+int __init au_procfs_init(void);
+void au_procfs_fin(void);
+#else
+AuStubInt0(au_procfs_init, void);
+AuStubVoid(au_procfs_fin, void);
+#endif
+
+/* ---------------------------------------------------------------------- */
+
+/* kmem cache */
+enum {
+ AuCache_DINFO,
+ AuCache_ICNTNR,
+ AuCache_FINFO,
+ AuCache_VDIR,
+ AuCache_DEHSTR,
+#ifdef CONFIG_AUFS_HNOTIFY
+ AuCache_HNOTIFY,
+#endif
+ AuCache_Last
+};
+
+#define AuCacheFlags (SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD)
+#define AuCache(type) KMEM_CACHE(type, AuCacheFlags)
+#define AuCacheCtor(type, ctor) \
+ kmem_cache_create(#type, sizeof(struct type), \
+ __alignof__(struct type), AuCacheFlags, ctor)
+
+extern struct kmem_cache *au_cachep[];
+
+#define AuCacheFuncs(name, index) \
+static inline struct au_##name *au_cache_alloc_##name(void) \
+{ return kmem_cache_alloc(au_cachep[AuCache_##index], GFP_NOFS); } \
+static inline void au_cache_free_##name(struct au_##name *p) \
+{ kmem_cache_free(au_cachep[AuCache_##index], p); }
+
+AuCacheFuncs(dinfo, DINFO);
+AuCacheFuncs(icntnr, ICNTNR);
+AuCacheFuncs(finfo, FINFO);
+AuCacheFuncs(vdir, VDIR);
+AuCacheFuncs(vdir_dehstr, DEHSTR);
+#ifdef CONFIG_AUFS_HNOTIFY
+AuCacheFuncs(hnotify, HNOTIFY);
+#endif
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_MODULE_H__ */
diff -urN a/fs/aufs/opts.c b/fs/aufs/opts.c
--- a/fs/aufs/opts.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/opts.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,1677 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * mount options/flags
+ */
+
+#include <linux/namei.h>
+#include <linux/types.h> /* a distribution requires */
+#include <linux/parser.h>
+#include "aufs.h"
+
+/* ---------------------------------------------------------------------- */
+
+enum {
+ Opt_br,
+ Opt_add, Opt_del, Opt_mod, Opt_reorder, Opt_append, Opt_prepend,
+ Opt_idel, Opt_imod, Opt_ireorder,
+ Opt_dirwh, Opt_rdcache, Opt_rdblk, Opt_rdhash, Opt_rendir,
+ Opt_rdblk_def, Opt_rdhash_def,
+ Opt_xino, Opt_zxino, Opt_noxino,
+ Opt_trunc_xino, Opt_trunc_xino_v, Opt_notrunc_xino,
+ Opt_trunc_xino_path, Opt_itrunc_xino,
+ Opt_trunc_xib, Opt_notrunc_xib,
+ Opt_shwh, Opt_noshwh,
+ Opt_plink, Opt_noplink, Opt_list_plink,
+ Opt_udba,
+ Opt_dio, Opt_nodio,
+ /* Opt_lock, Opt_unlock, */
+ Opt_cmd, Opt_cmd_args,
+ Opt_diropq_a, Opt_diropq_w,
+ Opt_warn_perm, Opt_nowarn_perm,
+ Opt_wbr_copyup, Opt_wbr_create,
+ Opt_refrof, Opt_norefrof,
+ Opt_verbose, Opt_noverbose,
+ Opt_sum, Opt_nosum, Opt_wsum,
+ Opt_tail, Opt_ignore, Opt_ignore_silent, Opt_err
+};
+
+static match_table_t options = {
+ {Opt_br, "br=%s"},
+ {Opt_br, "br:%s"},
+
+ {Opt_add, "add=%d:%s"},
+ {Opt_add, "add:%d:%s"},
+ {Opt_add, "ins=%d:%s"},
+ {Opt_add, "ins:%d:%s"},
+ {Opt_append, "append=%s"},
+ {Opt_append, "append:%s"},
+ {Opt_prepend, "prepend=%s"},
+ {Opt_prepend, "prepend:%s"},
+
+ {Opt_del, "del=%s"},
+ {Opt_del, "del:%s"},
+ /* {Opt_idel, "idel:%d"}, */
+ {Opt_mod, "mod=%s"},
+ {Opt_mod, "mod:%s"},
+ /* {Opt_imod, "imod:%d:%s"}, */
+
+ {Opt_dirwh, "dirwh=%d"},
+
+ {Opt_xino, "xino=%s"},
+ {Opt_noxino, "noxino"},
+ {Opt_trunc_xino, "trunc_xino"},
+ {Opt_trunc_xino_v, "trunc_xino_v=%d:%d"},
+ {Opt_notrunc_xino, "notrunc_xino"},
+ {Opt_trunc_xino_path, "trunc_xino=%s"},
+ {Opt_itrunc_xino, "itrunc_xino=%d"},
+ /* {Opt_zxino, "zxino=%s"}, */
+ {Opt_trunc_xib, "trunc_xib"},
+ {Opt_notrunc_xib, "notrunc_xib"},
+
+#ifdef CONFIG_PROC_FS
+ {Opt_plink, "plink"},
+#else
+ {Opt_ignore_silent, "plink"},
+#endif
+
+ {Opt_noplink, "noplink"},
+
+#ifdef CONFIG_AUFS_DEBUG
+ {Opt_list_plink, "list_plink"},
+#endif
+
+ {Opt_udba, "udba=%s"},
+
+ {Opt_dio, "dio"},
+ {Opt_nodio, "nodio"},
+
+ {Opt_diropq_a, "diropq=always"},
+ {Opt_diropq_a, "diropq=a"},
+ {Opt_diropq_w, "diropq=whiteouted"},
+ {Opt_diropq_w, "diropq=w"},
+
+ {Opt_warn_perm, "warn_perm"},
+ {Opt_nowarn_perm, "nowarn_perm"},
+
+ /* keep them temporary */
+ {Opt_ignore_silent, "coo=%s"},
+ {Opt_ignore_silent, "nodlgt"},
+ {Opt_ignore_silent, "nodirperm1"},
+ {Opt_ignore_silent, "clean_plink"},
+
+#ifdef CONFIG_AUFS_SHWH
+ {Opt_shwh, "shwh"},
+#endif
+ {Opt_noshwh, "noshwh"},
+
+ {Opt_rendir, "rendir=%d"},
+
+ {Opt_refrof, "refrof"},
+ {Opt_norefrof, "norefrof"},
+
+ {Opt_verbose, "verbose"},
+ {Opt_verbose, "v"},
+ {Opt_noverbose, "noverbose"},
+ {Opt_noverbose, "quiet"},
+ {Opt_noverbose, "q"},
+ {Opt_noverbose, "silent"},
+
+ {Opt_sum, "sum"},
+ {Opt_nosum, "nosum"},
+ {Opt_wsum, "wsum"},
+
+ {Opt_rdcache, "rdcache=%d"},
+ {Opt_rdblk, "rdblk=%d"},
+ {Opt_rdblk_def, "rdblk=def"},
+ {Opt_rdhash, "rdhash=%d"},
+ {Opt_rdhash_def, "rdhash=def"},
+
+ {Opt_wbr_create, "create=%s"},
+ {Opt_wbr_create, "create_policy=%s"},
+ {Opt_wbr_copyup, "cpup=%s"},
+ {Opt_wbr_copyup, "copyup=%s"},
+ {Opt_wbr_copyup, "copyup_policy=%s"},
+
+ /* internal use for the scripts */
+ {Opt_ignore_silent, "si=%s"},
+
+ {Opt_br, "dirs=%s"},
+ {Opt_ignore, "debug=%d"},
+ {Opt_ignore, "delete=whiteout"},
+ {Opt_ignore, "delete=all"},
+ {Opt_ignore, "imap=%s"},
+
+ /* temporary workaround, due to old mount(8)? */
+ {Opt_ignore_silent, "relatime"},
+
+ {Opt_err, NULL}
+};
+
+/* ---------------------------------------------------------------------- */
+
+static const char *au_parser_pattern(int val, struct match_token *token)
+{
+ while (token->pattern) {
+ if (token->token == val)
+ return token->pattern;
+ token++;
+ }
+ BUG();
+ return "??";
+}
+
+/* ---------------------------------------------------------------------- */
+
+static match_table_t brperm = {
+ {AuBrPerm_RO, AUFS_BRPERM_RO},
+ {AuBrPerm_RR, AUFS_BRPERM_RR},
+ {AuBrPerm_RW, AUFS_BRPERM_RW},
+ {0, NULL}
+};
+
+static match_table_t brrattr = {
+ {AuBrRAttr_WH, AUFS_BRRATTR_WH},
+ {0, NULL}
+};
+
+static match_table_t brwattr = {
+ {AuBrWAttr_NoLinkWH, AUFS_BRWATTR_NLWH},
+ {0, NULL}
+};
+
+#define AuBrStr_LONGEST AUFS_BRPERM_RW "+" AUFS_BRWATTR_NLWH
+
+static int br_attr_val(char *str, match_table_t table, substring_t args[])
+{
+ int attr, v;
+ char *p;
+
+ attr = 0;
+ do {
+ p = strchr(str, '+');
+ if (p)
+ *p = 0;
+ v = match_token(str, table, args);
+ if (v)
+ attr |= v;
+ else {
+ if (p)
+ *p = '+';
+ pr_warning("ignored branch attribute %s\n", str);
+ break;
+ }
+ if (p)
+ str = p + 1;
+ } while (p);
+
+ return attr;
+}
+
+static int noinline_for_stack br_perm_val(char *perm)
+{
+ int val;
+ char *p;
+ substring_t args[MAX_OPT_ARGS];
+
+ p = strchr(perm, '+');
+ if (p)
+ *p = 0;
+ val = match_token(perm, brperm, args);
+ if (!val) {
+ if (p)
+ *p = '+';
+ pr_warning("ignored branch permission %s\n", perm);
+ val = AuBrPerm_RO;
+ goto out;
+ }
+ if (!p)
+ goto out;
+
+ switch (val) {
+ case AuBrPerm_RO:
+ case AuBrPerm_RR:
+ val |= br_attr_val(p + 1, brrattr, args);
+ break;
+ case AuBrPerm_RW:
+ val |= br_attr_val(p + 1, brwattr, args);
+ break;
+ }
+
+out:
+ return val;
+}
+
+/* Caller should free the return value */
+char *au_optstr_br_perm(int brperm)
+{
+ char *p, a[sizeof(AuBrStr_LONGEST)];
+ int sz;
+
+#define SetPerm(str) do { \
+ sz = sizeof(str); \
+ memcpy(a, str, sz); \
+ p = a + sz - 1; \
+ } while (0)
+
+#define AppendAttr(flag, str) do { \
+ if (brperm & flag) { \
+ sz = sizeof(str); \
+ *p++ = '+'; \
+ memcpy(p, str, sz); \
+ p += sz - 1; \
+ } \
+ } while (0)
+
+ switch (brperm & AuBrPerm_Mask) {
+ case AuBrPerm_RO:
+ SetPerm(AUFS_BRPERM_RO);
+ break;
+ case AuBrPerm_RR:
+ SetPerm(AUFS_BRPERM_RR);
+ break;
+ case AuBrPerm_RW:
+ SetPerm(AUFS_BRPERM_RW);
+ break;
+ default:
+ AuDebugOn(1);
+ }
+
+ AppendAttr(AuBrRAttr_WH, AUFS_BRRATTR_WH);
+ AppendAttr(AuBrWAttr_NoLinkWH, AUFS_BRWATTR_NLWH);
+
+ AuDebugOn(strlen(a) >= sizeof(a));
+ return kstrdup(a, GFP_NOFS);
+#undef SetPerm
+#undef AppendAttr
+}
+
+/* ---------------------------------------------------------------------- */
+
+static match_table_t udbalevel = {
+ {AuOpt_UDBA_REVAL, "reval"},
+ {AuOpt_UDBA_NONE, "none"},
+#ifdef CONFIG_AUFS_HNOTIFY
+ {AuOpt_UDBA_HNOTIFY, "notify"}, /* abstraction */
+#ifdef CONFIG_AUFS_HFSNOTIFY
+ {AuOpt_UDBA_HNOTIFY, "fsnotify"},
+#endif
+#endif
+ {-1, NULL}
+};
+
+static int noinline_for_stack udba_val(char *str)
+{
+ substring_t args[MAX_OPT_ARGS];
+
+ return match_token(str, udbalevel, args);
+}
+
+const char *au_optstr_udba(int udba)
+{
+ return au_parser_pattern(udba, (void *)udbalevel);
+}
+
+/* ---------------------------------------------------------------------- */
+
+static match_table_t au_wbr_create_policy = {
+ {AuWbrCreate_TDP, "tdp"},
+ {AuWbrCreate_TDP, "top-down-parent"},
+ {AuWbrCreate_RR, "rr"},
+ {AuWbrCreate_RR, "round-robin"},
+ {AuWbrCreate_MFS, "mfs"},
+ {AuWbrCreate_MFS, "most-free-space"},
+ {AuWbrCreate_MFSV, "mfs:%d"},
+ {AuWbrCreate_MFSV, "most-free-space:%d"},
+
+ {AuWbrCreate_MFSRR, "mfsrr:%d"},
+ {AuWbrCreate_MFSRRV, "mfsrr:%d:%d"},
+ {AuWbrCreate_PMFS, "pmfs"},
+ {AuWbrCreate_PMFSV, "pmfs:%d"},
+
+ {-1, NULL}
+};
+
+/*
+ * cf. linux/lib/parser.c and cmdline.c
+ * gave up calling memparse() since it uses simple_strtoull() instead of
+ * kstrto...().
+ */
+static int noinline_for_stack
+au_match_ull(substring_t *s, unsigned long long *result)
+{
+ int err;
+ unsigned int len;
+ char a[32];
+
+ err = -ERANGE;
+ len = s->to - s->from;
+ if (len + 1 <= sizeof(a)) {
+ memcpy(a, s->from, len);
+ a[len] = '\0';
+ err = kstrtoull(a, 0, result);
+ }
+ return err;
+}
+
+static int au_wbr_mfs_wmark(substring_t *arg, char *str,
+ struct au_opt_wbr_create *create)
+{
+ int err;
+ unsigned long long ull;
+
+ err = 0;
+ if (!au_match_ull(arg, &ull))
+ create->mfsrr_watermark = ull;
+ else {
+ pr_err("bad integer in %s\n", str);
+ err = -EINVAL;
+ }
+
+ return err;
+}
+
+static int au_wbr_mfs_sec(substring_t *arg, char *str,
+ struct au_opt_wbr_create *create)
+{
+ int n, err;
+
+ err = 0;
+ if (!match_int(arg, &n) && 0 <= n && n <= AUFS_MFS_MAX_SEC)
+ create->mfs_second = n;
+ else {
+ pr_err("bad integer in %s\n", str);
+ err = -EINVAL;
+ }
+
+ return err;
+}
+
+static int noinline_for_stack
+au_wbr_create_val(char *str, struct au_opt_wbr_create *create)
+{
+ int err, e;
+ substring_t args[MAX_OPT_ARGS];
+
+ err = match_token(str, au_wbr_create_policy, args);
+ create->wbr_create = err;
+ switch (err) {
+ case AuWbrCreate_MFSRRV:
+ e = au_wbr_mfs_wmark(&args[0], str, create);
+ if (!e)
+ e = au_wbr_mfs_sec(&args[1], str, create);
+ if (unlikely(e))
+ err = e;
+ break;
+ case AuWbrCreate_MFSRR:
+ e = au_wbr_mfs_wmark(&args[0], str, create);
+ if (unlikely(e)) {
+ err = e;
+ break;
+ }
+ /*FALLTHROUGH*/
+ case AuWbrCreate_MFS:
+ case AuWbrCreate_PMFS:
+ create->mfs_second = AUFS_MFS_DEF_SEC;
+ break;
+ case AuWbrCreate_MFSV:
+ case AuWbrCreate_PMFSV:
+ e = au_wbr_mfs_sec(&args[0], str, create);
+ if (unlikely(e))
+ err = e;
+ break;
+ }
+
+ return err;
+}
+
+const char *au_optstr_wbr_create(int wbr_create)
+{
+ return au_parser_pattern(wbr_create, (void *)au_wbr_create_policy);
+}
+
+static match_table_t au_wbr_copyup_policy = {
+ {AuWbrCopyup_TDP, "tdp"},
+ {AuWbrCopyup_TDP, "top-down-parent"},
+ {AuWbrCopyup_BUP, "bup"},
+ {AuWbrCopyup_BUP, "bottom-up-parent"},
+ {AuWbrCopyup_BU, "bu"},
+ {AuWbrCopyup_BU, "bottom-up"},
+ {-1, NULL}
+};
+
+static int noinline_for_stack au_wbr_copyup_val(char *str)
+{
+ substring_t args[MAX_OPT_ARGS];
+
+ return match_token(str, au_wbr_copyup_policy, args);
+}
+
+const char *au_optstr_wbr_copyup(int wbr_copyup)
+{
+ return au_parser_pattern(wbr_copyup, (void *)au_wbr_copyup_policy);
+}
+
+/* ---------------------------------------------------------------------- */
+
+static const int lkup_dirflags = LOOKUP_FOLLOW | LOOKUP_DIRECTORY;
+
+static void dump_opts(struct au_opts *opts)
+{
+#ifdef CONFIG_AUFS_DEBUG
+ /* reduce stack space */
+ union {
+ struct au_opt_add *add;
+ struct au_opt_del *del;
+ struct au_opt_mod *mod;
+ struct au_opt_xino *xino;
+ struct au_opt_xino_itrunc *xino_itrunc;
+ struct au_opt_wbr_create *create;
+ } u;
+ struct au_opt *opt;
+
+ opt = opts->opt;
+ while (opt->type != Opt_tail) {
+ switch (opt->type) {
+ case Opt_add:
+ u.add = &opt->add;
+ AuDbg("add {b%d, %s, 0x%x, %p}\n",
+ u.add->bindex, u.add->pathname, u.add->perm,
+ u.add->path.dentry);
+ break;
+ case Opt_del:
+ case Opt_idel:
+ u.del = &opt->del;
+ AuDbg("del {%s, %p}\n",
+ u.del->pathname, u.del->h_path.dentry);
+ break;
+ case Opt_mod:
+ case Opt_imod:
+ u.mod = &opt->mod;
+ AuDbg("mod {%s, 0x%x, %p}\n",
+ u.mod->path, u.mod->perm, u.mod->h_root);
+ break;
+ case Opt_append:
+ u.add = &opt->add;
+ AuDbg("append {b%d, %s, 0x%x, %p}\n",
+ u.add->bindex, u.add->pathname, u.add->perm,
+ u.add->path.dentry);
+ break;
+ case Opt_prepend:
+ u.add = &opt->add;
+ AuDbg("prepend {b%d, %s, 0x%x, %p}\n",
+ u.add->bindex, u.add->pathname, u.add->perm,
+ u.add->path.dentry);
+ break;
+ case Opt_dirwh:
+ AuDbg("dirwh %d\n", opt->dirwh);
+ break;
+ case Opt_rdcache:
+ AuDbg("rdcache %d\n", opt->rdcache);
+ break;
+ case Opt_rdblk:
+ AuDbg("rdblk %u\n", opt->rdblk);
+ break;
+ case Opt_rdblk_def:
+ AuDbg("rdblk_def\n");
+ break;
+ case Opt_rdhash:
+ AuDbg("rdhash %u\n", opt->rdhash);
+ break;
+ case Opt_rdhash_def:
+ AuDbg("rdhash_def\n");
+ break;
+ case Opt_xino:
+ u.xino = &opt->xino;
+ AuDbg("xino {%s %.*s}\n",
+ u.xino->path,
+ AuDLNPair(u.xino->file->f_dentry));
+ break;
+ case Opt_trunc_xino:
+ AuLabel(trunc_xino);
+ break;
+ case Opt_notrunc_xino:
+ AuLabel(notrunc_xino);
+ break;
+ case Opt_trunc_xino_path:
+ case Opt_itrunc_xino:
+ u.xino_itrunc = &opt->xino_itrunc;
+ AuDbg("trunc_xino %d\n", u.xino_itrunc->bindex);
+ break;
+
+ case Opt_noxino:
+ AuLabel(noxino);
+ break;
+ case Opt_trunc_xib:
+ AuLabel(trunc_xib);
+ break;
+ case Opt_notrunc_xib:
+ AuLabel(notrunc_xib);
+ break;
+ case Opt_shwh:
+ AuLabel(shwh);
+ break;
+ case Opt_noshwh:
+ AuLabel(noshwh);
+ break;
+ case Opt_plink:
+ AuLabel(plink);
+ break;
+ case Opt_noplink:
+ AuLabel(noplink);
+ break;
+ case Opt_list_plink:
+ AuLabel(list_plink);
+ break;
+ case Opt_udba:
+ AuDbg("udba %d, %s\n",
+ opt->udba, au_optstr_udba(opt->udba));
+ break;
+ case Opt_dio:
+ AuLabel(dio);
+ break;
+ case Opt_nodio:
+ AuLabel(nodio);
+ break;
+ case Opt_diropq_a:
+ AuLabel(diropq_a);
+ break;
+ case Opt_diropq_w:
+ AuLabel(diropq_w);
+ break;
+ case Opt_warn_perm:
+ AuLabel(warn_perm);
+ break;
+ case Opt_nowarn_perm:
+ AuLabel(nowarn_perm);
+ break;
+ case Opt_refrof:
+ AuLabel(refrof);
+ break;
+ case Opt_norefrof:
+ AuLabel(norefrof);
+ break;
+ case Opt_verbose:
+ AuLabel(verbose);
+ break;
+ case Opt_noverbose:
+ AuLabel(noverbose);
+ break;
+ case Opt_sum:
+ AuLabel(sum);
+ break;
+ case Opt_nosum:
+ AuLabel(nosum);
+ break;
+ case Opt_wsum:
+ AuLabel(wsum);
+ break;
+ case Opt_wbr_create:
+ u.create = &opt->wbr_create;
+ AuDbg("create %d, %s\n", u.create->wbr_create,
+ au_optstr_wbr_create(u.create->wbr_create));
+ switch (u.create->wbr_create) {
+ case AuWbrCreate_MFSV:
+ case AuWbrCreate_PMFSV:
+ AuDbg("%d sec\n", u.create->mfs_second);
+ break;
+ case AuWbrCreate_MFSRR:
+ AuDbg("%llu watermark\n",
+ u.create->mfsrr_watermark);
+ break;
+ case AuWbrCreate_MFSRRV:
+ AuDbg("%llu watermark, %d sec\n",
+ u.create->mfsrr_watermark,
+ u.create->mfs_second);
+ break;
+ }
+ break;
+ case Opt_wbr_copyup:
+ AuDbg("copyup %d, %s\n", opt->wbr_copyup,
+ au_optstr_wbr_copyup(opt->wbr_copyup));
+ break;
+ default:
+ BUG();
+ }
+ opt++;
+ }
+#endif
+}
+
+void au_opts_free(struct au_opts *opts)
+{
+ struct au_opt *opt;
+
+ opt = opts->opt;
+ while (opt->type != Opt_tail) {
+ switch (opt->type) {
+ case Opt_add:
+ case Opt_append:
+ case Opt_prepend:
+ path_put(&opt->add.path);
+ break;
+ case Opt_del:
+ case Opt_idel:
+ path_put(&opt->del.h_path);
+ break;
+ case Opt_mod:
+ case Opt_imod:
+ dput(opt->mod.h_root);
+ break;
+ case Opt_xino:
+ fput(opt->xino.file);
+ break;
+ }
+ opt++;
+ }
+}
+
+static int opt_add(struct au_opt *opt, char *opt_str, unsigned long sb_flags,
+ aufs_bindex_t bindex)
+{
+ int err;
+ struct au_opt_add *add = &opt->add;
+ char *p;
+
+ add->bindex = bindex;
+ add->perm = AuBrPerm_RO;
+ add->pathname = opt_str;
+ p = strchr(opt_str, '=');
+ if (p) {
+ *p++ = 0;
+ if (*p)
+ add->perm = br_perm_val(p);
+ }
+
+ err = vfsub_kern_path(add->pathname, lkup_dirflags, &add->path);
+ if (!err) {
+ if (!p) {
+ add->perm = AuBrPerm_RO;
+ if (au_test_fs_rr(add->path.dentry->d_sb))
+ add->perm = AuBrPerm_RR;
+ else if (!bindex && !(sb_flags & MS_RDONLY))
+ add->perm = AuBrPerm_RW;
+ }
+ opt->type = Opt_add;
+ goto out;
+ }
+ pr_err("lookup failed %s (%d)\n", add->pathname, err);
+ err = -EINVAL;
+
+out:
+ return err;
+}
+
+static int au_opts_parse_del(struct au_opt_del *del, substring_t args[])
+{
+ int err;
+
+ del->pathname = args[0].from;
+ AuDbg("del path %s\n", del->pathname);
+
+ err = vfsub_kern_path(del->pathname, lkup_dirflags, &del->h_path);
+ if (unlikely(err))
+ pr_err("lookup failed %s (%d)\n", del->pathname, err);
+
+ return err;
+}
+
+#if 0 /* reserved for future use */
+static int au_opts_parse_idel(struct super_block *sb, aufs_bindex_t bindex,
+ struct au_opt_del *del, substring_t args[])
+{
+ int err;
+ struct dentry *root;
+
+ err = -EINVAL;
+ root = sb->s_root;
+ aufs_read_lock(root, AuLock_FLUSH);
+ if (bindex < 0 || au_sbend(sb) < bindex) {
+ pr_err("out of bounds, %d\n", bindex);
+ goto out;
+ }
+
+ err = 0;
+ del->h_path.dentry = dget(au_h_dptr(root, bindex));
+ del->h_path.mnt = mntget(au_sbr_mnt(sb, bindex));
+
+out:
+ aufs_read_unlock(root, !AuLock_IR);
+ return err;
+}
+#endif
+
+static int noinline_for_stack
+au_opts_parse_mod(struct au_opt_mod *mod, substring_t args[])
+{
+ int err;
+ struct path path;
+ char *p;
+
+ err = -EINVAL;
+ mod->path = args[0].from;
+ p = strchr(mod->path, '=');
+ if (unlikely(!p)) {
+ pr_err("no permssion %s\n", args[0].from);
+ goto out;
+ }
+
+ *p++ = 0;
+ err = vfsub_kern_path(mod->path, lkup_dirflags, &path);
+ if (unlikely(err)) {
+ pr_err("lookup failed %s (%d)\n", mod->path, err);
+ goto out;
+ }
+
+ mod->perm = br_perm_val(p);
+ AuDbg("mod path %s, perm 0x%x, %s\n", mod->path, mod->perm, p);
+ mod->h_root = dget(path.dentry);
+ path_put(&path);
+
+out:
+ return err;
+}
+
+#if 0 /* reserved for future use */
+static int au_opts_parse_imod(struct super_block *sb, aufs_bindex_t bindex,
+ struct au_opt_mod *mod, substring_t args[])
+{
+ int err;
+ struct dentry *root;
+
+ err = -EINVAL;
+ root = sb->s_root;
+ aufs_read_lock(root, AuLock_FLUSH);
+ if (bindex < 0 || au_sbend(sb) < bindex) {
+ pr_err("out of bounds, %d\n", bindex);
+ goto out;
+ }
+
+ err = 0;
+ mod->perm = br_perm_val(args[1].from);
+ AuDbg("mod path %s, perm 0x%x, %s\n",
+ mod->path, mod->perm, args[1].from);
+ mod->h_root = dget(au_h_dptr(root, bindex));
+
+out:
+ aufs_read_unlock(root, !AuLock_IR);
+ return err;
+}
+#endif
+
+static int au_opts_parse_xino(struct super_block *sb, struct au_opt_xino *xino,
+ substring_t args[])
+{
+ int err;
+ struct file *file;
+
+ file = au_xino_create(sb, args[0].from, /*silent*/0);
+ err = PTR_ERR(file);
+ if (IS_ERR(file))
+ goto out;
+
+ err = -EINVAL;
+ if (unlikely(file->f_dentry->d_sb == sb)) {
+ fput(file);
+ pr_err("%s must be outside\n", args[0].from);
+ goto out;
+ }
+
+ err = 0;
+ xino->file = file;
+ xino->path = args[0].from;
+
+out:
+ return err;
+}
+
+static int noinline_for_stack
+au_opts_parse_xino_itrunc_path(struct super_block *sb,
+ struct au_opt_xino_itrunc *xino_itrunc,
+ substring_t args[])
+{
+ int err;
+ aufs_bindex_t bend, bindex;
+ struct path path;
+ struct dentry *root;
+
+ err = vfsub_kern_path(args[0].from, lkup_dirflags, &path);
+ if (unlikely(err)) {
+ pr_err("lookup failed %s (%d)\n", args[0].from, err);
+ goto out;
+ }
+
+ xino_itrunc->bindex = -1;
+ root = sb->s_root;
+ aufs_read_lock(root, AuLock_FLUSH);
+ bend = au_sbend(sb);
+ for (bindex = 0; bindex <= bend; bindex++) {
+ if (au_h_dptr(root, bindex) == path.dentry) {
+ xino_itrunc->bindex = bindex;
+ break;
+ }
+ }
+ aufs_read_unlock(root, !AuLock_IR);
+ path_put(&path);
+
+ if (unlikely(xino_itrunc->bindex < 0)) {
+ pr_err("no such branch %s\n", args[0].from);
+ err = -EINVAL;
+ }
+
+out:
+ return err;
+}
+
+/* called without aufs lock */
+int au_opts_parse(struct super_block *sb, char *str, struct au_opts *opts)
+{
+ int err, n, token;
+ aufs_bindex_t bindex;
+ unsigned char skipped;
+ struct dentry *root;
+ struct au_opt *opt, *opt_tail;
+ char *opt_str;
+ /* reduce the stack space */
+ union {
+ struct au_opt_xino_itrunc *xino_itrunc;
+ struct au_opt_wbr_create *create;
+ } u;
+ struct {
+ substring_t args[MAX_OPT_ARGS];
+ } *a;
+
+ err = -ENOMEM;
+ a = kmalloc(sizeof(*a), GFP_NOFS);
+ if (unlikely(!a))
+ goto out;
+
+ root = sb->s_root;
+ err = 0;
+ bindex = 0;
+ opt = opts->opt;
+ opt_tail = opt + opts->max_opt - 1;
+ opt->type = Opt_tail;
+ while (!err && (opt_str = strsep(&str, ",")) && *opt_str) {
+ err = -EINVAL;
+ skipped = 0;
+ token = match_token(opt_str, options, a->args);
+ switch (token) {
+ case Opt_br:
+ err = 0;
+ while (!err && (opt_str = strsep(&a->args[0].from, ":"))
+ && *opt_str) {
+ err = opt_add(opt, opt_str, opts->sb_flags,
+ bindex++);
+ if (unlikely(!err && ++opt > opt_tail)) {
+ err = -E2BIG;
+ break;
+ }
+ opt->type = Opt_tail;
+ skipped = 1;
+ }
+ break;
+ case Opt_add:
+ if (unlikely(match_int(&a->args[0], &n))) {
+ pr_err("bad integer in %s\n", opt_str);
+ break;
+ }
+ bindex = n;
+ err = opt_add(opt, a->args[1].from, opts->sb_flags,
+ bindex);
+ if (!err)
+ opt->type = token;
+ break;
+ case Opt_append:
+ err = opt_add(opt, a->args[0].from, opts->sb_flags,
+ /*dummy bindex*/1);
+ if (!err)
+ opt->type = token;
+ break;
+ case Opt_prepend:
+ err = opt_add(opt, a->args[0].from, opts->sb_flags,
+ /*bindex*/0);
+ if (!err)
+ opt->type = token;
+ break;
+ case Opt_del:
+ err = au_opts_parse_del(&opt->del, a->args);
+ if (!err)
+ opt->type = token;
+ break;
+#if 0 /* reserved for future use */
+ case Opt_idel:
+ del->pathname = "(indexed)";
+ if (unlikely(match_int(&args[0], &n))) {
+ pr_err("bad integer in %s\n", opt_str);
+ break;
+ }
+ err = au_opts_parse_idel(sb, n, &opt->del, a->args);
+ if (!err)
+ opt->type = token;
+ break;
+#endif
+ case Opt_mod:
+ err = au_opts_parse_mod(&opt->mod, a->args);
+ if (!err)
+ opt->type = token;
+ break;
+#ifdef IMOD /* reserved for future use */
+ case Opt_imod:
+ u.mod->path = "(indexed)";
+ if (unlikely(match_int(&a->args[0], &n))) {
+ pr_err("bad integer in %s\n", opt_str);
+ break;
+ }
+ err = au_opts_parse_imod(sb, n, &opt->mod, a->args);
+ if (!err)
+ opt->type = token;
+ break;
+#endif
+ case Opt_xino:
+ err = au_opts_parse_xino(sb, &opt->xino, a->args);
+ if (!err)
+ opt->type = token;
+ break;
+
+ case Opt_trunc_xino_path:
+ err = au_opts_parse_xino_itrunc_path
+ (sb, &opt->xino_itrunc, a->args);
+ if (!err)
+ opt->type = token;
+ break;
+
+ case Opt_itrunc_xino:
+ u.xino_itrunc = &opt->xino_itrunc;
+ if (unlikely(match_int(&a->args[0], &n))) {
+ pr_err("bad integer in %s\n", opt_str);
+ break;
+ }
+ u.xino_itrunc->bindex = n;
+ aufs_read_lock(root, AuLock_FLUSH);
+ if (n < 0 || au_sbend(sb) < n) {
+ pr_err("out of bounds, %d\n", n);
+ aufs_read_unlock(root, !AuLock_IR);
+ break;
+ }
+ aufs_read_unlock(root, !AuLock_IR);
+ err = 0;
+ opt->type = token;
+ break;
+
+ case Opt_dirwh:
+ if (unlikely(match_int(&a->args[0], &opt->dirwh)))
+ break;
+ err = 0;
+ opt->type = token;
+ break;
+
+ case Opt_rdcache:
+ if (unlikely(match_int(&a->args[0], &n))) {
+ pr_err("bad integer in %s\n", opt_str);
+ break;
+ }
+ if (unlikely(n > AUFS_RDCACHE_MAX)) {
+ pr_err("rdcache must be smaller than %d\n",
+ AUFS_RDCACHE_MAX);
+ break;
+ }
+ opt->rdcache = n;
+ err = 0;
+ opt->type = token;
+ break;
+ case Opt_rdblk:
+ if (unlikely(match_int(&a->args[0], &n)
+ || n < 0
+ || n > KMALLOC_MAX_SIZE)) {
+ pr_err("bad integer in %s\n", opt_str);
+ break;
+ }
+ if (unlikely(n && n < NAME_MAX)) {
+ pr_err("rdblk must be larger than %d\n",
+ NAME_MAX);
+ break;
+ }
+ opt->rdblk = n;
+ err = 0;
+ opt->type = token;
+ break;
+ case Opt_rdhash:
+ if (unlikely(match_int(&a->args[0], &n)
+ || n < 0
+ || n * sizeof(struct hlist_head)
+ > KMALLOC_MAX_SIZE)) {
+ pr_err("bad integer in %s\n", opt_str);
+ break;
+ }
+ opt->rdhash = n;
+ err = 0;
+ opt->type = token;
+ break;
+
+ case Opt_trunc_xino:
+ case Opt_notrunc_xino:
+ case Opt_noxino:
+ case Opt_trunc_xib:
+ case Opt_notrunc_xib:
+ case Opt_shwh:
+ case Opt_noshwh:
+ case Opt_plink:
+ case Opt_noplink:
+ case Opt_list_plink:
+ case Opt_dio:
+ case Opt_nodio:
+ case Opt_diropq_a:
+ case Opt_diropq_w:
+ case Opt_warn_perm:
+ case Opt_nowarn_perm:
+ case Opt_refrof:
+ case Opt_norefrof:
+ case Opt_verbose:
+ case Opt_noverbose:
+ case Opt_sum:
+ case Opt_nosum:
+ case Opt_wsum:
+ case Opt_rdblk_def:
+ case Opt_rdhash_def:
+ err = 0;
+ opt->type = token;
+ break;
+
+ case Opt_udba:
+ opt->udba = udba_val(a->args[0].from);
+ if (opt->udba >= 0) {
+ err = 0;
+ opt->type = token;
+ } else
+ pr_err("wrong value, %s\n", opt_str);
+ break;
+
+ case Opt_wbr_create:
+ u.create = &opt->wbr_create;
+ u.create->wbr_create
+ = au_wbr_create_val(a->args[0].from, u.create);
+ if (u.create->wbr_create >= 0) {
+ err = 0;
+ opt->type = token;
+ } else
+ pr_err("wrong value, %s\n", opt_str);
+ break;
+ case Opt_wbr_copyup:
+ opt->wbr_copyup = au_wbr_copyup_val(a->args[0].from);
+ if (opt->wbr_copyup >= 0) {
+ err = 0;
+ opt->type = token;
+ } else
+ pr_err("wrong value, %s\n", opt_str);
+ break;
+
+ case Opt_ignore:
+ pr_warning("ignored %s\n", opt_str);
+ /*FALLTHROUGH*/
+ case Opt_ignore_silent:
+ skipped = 1;
+ err = 0;
+ break;
+ case Opt_err:
+ pr_err("unknown option %s\n", opt_str);
+ break;
+ }
+
+ if (!err && !skipped) {
+ if (unlikely(++opt > opt_tail)) {
+ err = -E2BIG;
+ opt--;
+ opt->type = Opt_tail;
+ break;
+ }
+ opt->type = Opt_tail;
+ }
+ }
+
+ kfree(a);
+ dump_opts(opts);
+ if (unlikely(err))
+ au_opts_free(opts);
+
+out:
+ return err;
+}
+
+static int au_opt_wbr_create(struct super_block *sb,
+ struct au_opt_wbr_create *create)
+{
+ int err;
+ struct au_sbinfo *sbinfo;
+
+ SiMustWriteLock(sb);
+
+ err = 1; /* handled */
+ sbinfo = au_sbi(sb);
+ if (sbinfo->si_wbr_create_ops->fin) {
+ err = sbinfo->si_wbr_create_ops->fin(sb);
+ if (!err)
+ err = 1;
+ }
+
+ sbinfo->si_wbr_create = create->wbr_create;
+ sbinfo->si_wbr_create_ops = au_wbr_create_ops + create->wbr_create;
+ switch (create->wbr_create) {
+ case AuWbrCreate_MFSRRV:
+ case AuWbrCreate_MFSRR:
+ sbinfo->si_wbr_mfs.mfsrr_watermark = create->mfsrr_watermark;
+ /*FALLTHROUGH*/
+ case AuWbrCreate_MFS:
+ case AuWbrCreate_MFSV:
+ case AuWbrCreate_PMFS:
+ case AuWbrCreate_PMFSV:
+ sbinfo->si_wbr_mfs.mfs_expire
+ = msecs_to_jiffies(create->mfs_second * MSEC_PER_SEC);
+ break;
+ }
+
+ if (sbinfo->si_wbr_create_ops->init)
+ sbinfo->si_wbr_create_ops->init(sb); /* ignore */
+
+ return err;
+}
+
+/*
+ * returns,
+ * plus: processed without an error
+ * zero: unprocessed
+ */
+static int au_opt_simple(struct super_block *sb, struct au_opt *opt,
+ struct au_opts *opts)
+{
+ int err;
+ struct au_sbinfo *sbinfo;
+
+ SiMustWriteLock(sb);
+
+ err = 1; /* handled */
+ sbinfo = au_sbi(sb);
+ switch (opt->type) {
+ case Opt_udba:
+ sbinfo->si_mntflags &= ~AuOptMask_UDBA;
+ sbinfo->si_mntflags |= opt->udba;
+ opts->given_udba |= opt->udba;
+ break;
+
+ case Opt_plink:
+ au_opt_set(sbinfo->si_mntflags, PLINK);
+ break;
+ case Opt_noplink:
+ if (au_opt_test(sbinfo->si_mntflags, PLINK))
+ au_plink_put(sb, /*verbose*/1);
+ au_opt_clr(sbinfo->si_mntflags, PLINK);
+ break;
+ case Opt_list_plink:
+ if (au_opt_test(sbinfo->si_mntflags, PLINK))
+ au_plink_list(sb);
+ break;
+
+ case Opt_dio:
+ au_opt_set(sbinfo->si_mntflags, DIO);
+ au_fset_opts(opts->flags, REFRESH_DYAOP);
+ break;
+ case Opt_nodio:
+ au_opt_clr(sbinfo->si_mntflags, DIO);
+ au_fset_opts(opts->flags, REFRESH_DYAOP);
+ break;
+
+ case Opt_diropq_a:
+ au_opt_set(sbinfo->si_mntflags, ALWAYS_DIROPQ);
+ break;
+ case Opt_diropq_w:
+ au_opt_clr(sbinfo->si_mntflags, ALWAYS_DIROPQ);
+ break;
+
+ case Opt_warn_perm:
+ au_opt_set(sbinfo->si_mntflags, WARN_PERM);
+ break;
+ case Opt_nowarn_perm:
+ au_opt_clr(sbinfo->si_mntflags, WARN_PERM);
+ break;
+
+ case Opt_refrof:
+ au_opt_set(sbinfo->si_mntflags, REFROF);
+ break;
+ case Opt_norefrof:
+ au_opt_clr(sbinfo->si_mntflags, REFROF);
+ break;
+
+ case Opt_verbose:
+ au_opt_set(sbinfo->si_mntflags, VERBOSE);
+ break;
+ case Opt_noverbose:
+ au_opt_clr(sbinfo->si_mntflags, VERBOSE);
+ break;
+
+ case Opt_sum:
+ au_opt_set(sbinfo->si_mntflags, SUM);
+ break;
+ case Opt_wsum:
+ au_opt_clr(sbinfo->si_mntflags, SUM);
+ au_opt_set(sbinfo->si_mntflags, SUM_W);
+ case Opt_nosum:
+ au_opt_clr(sbinfo->si_mntflags, SUM);
+ au_opt_clr(sbinfo->si_mntflags, SUM_W);
+ break;
+
+ case Opt_wbr_create:
+ err = au_opt_wbr_create(sb, &opt->wbr_create);
+ break;
+ case Opt_wbr_copyup:
+ sbinfo->si_wbr_copyup = opt->wbr_copyup;
+ sbinfo->si_wbr_copyup_ops = au_wbr_copyup_ops + opt->wbr_copyup;
+ break;
+
+ case Opt_dirwh:
+ sbinfo->si_dirwh = opt->dirwh;
+ break;
+
+ case Opt_rdcache:
+ sbinfo->si_rdcache
+ = msecs_to_jiffies(opt->rdcache * MSEC_PER_SEC);
+ break;
+ case Opt_rdblk:
+ sbinfo->si_rdblk = opt->rdblk;
+ break;
+ case Opt_rdblk_def:
+ sbinfo->si_rdblk = AUFS_RDBLK_DEF;
+ break;
+ case Opt_rdhash:
+ sbinfo->si_rdhash = opt->rdhash;
+ break;
+ case Opt_rdhash_def:
+ sbinfo->si_rdhash = AUFS_RDHASH_DEF;
+ break;
+
+ case Opt_shwh:
+ au_opt_set(sbinfo->si_mntflags, SHWH);
+ break;
+ case Opt_noshwh:
+ au_opt_clr(sbinfo->si_mntflags, SHWH);
+ break;
+
+ case Opt_trunc_xino:
+ au_opt_set(sbinfo->si_mntflags, TRUNC_XINO);
+ break;
+ case Opt_notrunc_xino:
+ au_opt_clr(sbinfo->si_mntflags, TRUNC_XINO);
+ break;
+
+ case Opt_trunc_xino_path:
+ case Opt_itrunc_xino:
+ err = au_xino_trunc(sb, opt->xino_itrunc.bindex);
+ if (!err)
+ err = 1;
+ break;
+
+ case Opt_trunc_xib:
+ au_fset_opts(opts->flags, TRUNC_XIB);
+ break;
+ case Opt_notrunc_xib:
+ au_fclr_opts(opts->flags, TRUNC_XIB);
+ break;
+
+ default:
+ err = 0;
+ break;
+ }
+
+ return err;
+}
+
+/*
+ * returns tri-state.
+ * plus: processed without an error
+ * zero: unprocessed
+ * minus: error
+ */
+static int au_opt_br(struct super_block *sb, struct au_opt *opt,
+ struct au_opts *opts)
+{
+ int err, do_refresh;
+
+ err = 0;
+ switch (opt->type) {
+ case Opt_append:
+ opt->add.bindex = au_sbend(sb) + 1;
+ if (opt->add.bindex < 0)
+ opt->add.bindex = 0;
+ goto add;
+ case Opt_prepend:
+ opt->add.bindex = 0;
+ add:
+ case Opt_add:
+ err = au_br_add(sb, &opt->add,
+ au_ftest_opts(opts->flags, REMOUNT));
+ if (!err) {
+ err = 1;
+ au_fset_opts(opts->flags, REFRESH);
+ }
+ break;
+
+ case Opt_del:
+ case Opt_idel:
+ err = au_br_del(sb, &opt->del,
+ au_ftest_opts(opts->flags, REMOUNT));
+ if (!err) {
+ err = 1;
+ au_fset_opts(opts->flags, TRUNC_XIB);
+ au_fset_opts(opts->flags, REFRESH);
+ }
+ break;
+
+ case Opt_mod:
+ case Opt_imod:
+ err = au_br_mod(sb, &opt->mod,
+ au_ftest_opts(opts->flags, REMOUNT),
+ &do_refresh);
+ if (!err) {
+ err = 1;
+ if (do_refresh)
+ au_fset_opts(opts->flags, REFRESH);
+ }
+ break;
+ }
+
+ return err;
+}
+
+static int au_opt_xino(struct super_block *sb, struct au_opt *opt,
+ struct au_opt_xino **opt_xino,
+ struct au_opts *opts)
+{
+ int err;
+ aufs_bindex_t bend, bindex;
+ struct dentry *root, *parent, *h_root;
+
+ err = 0;
+ switch (opt->type) {
+ case Opt_xino:
+ err = au_xino_set(sb, &opt->xino,
+ !!au_ftest_opts(opts->flags, REMOUNT));
+ if (unlikely(err))
+ break;
+
+ *opt_xino = &opt->xino;
+ au_xino_brid_set(sb, -1);
+
+ /* safe d_parent access */
+ parent = opt->xino.file->f_dentry->d_parent;
+ root = sb->s_root;
+ bend = au_sbend(sb);
+ for (bindex = 0; bindex <= bend; bindex++) {
+ h_root = au_h_dptr(root, bindex);
+ if (h_root == parent) {
+ au_xino_brid_set(sb, au_sbr_id(sb, bindex));
+ break;
+ }
+ }
+ break;
+
+ case Opt_noxino:
+ au_xino_clr(sb);
+ au_xino_brid_set(sb, -1);
+ *opt_xino = (void *)-1;
+ break;
+ }
+
+ return err;
+}
+
+int au_opts_verify(struct super_block *sb, unsigned long sb_flags,
+ unsigned int pending)
+{
+ int err;
+ aufs_bindex_t bindex, bend;
+ unsigned char do_plink, skip, do_free;
+ struct au_branch *br;
+ struct au_wbr *wbr;
+ struct dentry *root;
+ struct inode *dir, *h_dir;
+ struct au_sbinfo *sbinfo;
+ struct au_hinode *hdir;
+
+ SiMustAnyLock(sb);
+
+ sbinfo = au_sbi(sb);
+ AuDebugOn(!(sbinfo->si_mntflags & AuOptMask_UDBA));
+
+ if (!(sb_flags & MS_RDONLY)) {
+ if (unlikely(!au_br_writable(au_sbr_perm(sb, 0))))
+ pr_warning("first branch should be rw\n");
+ if (unlikely(au_opt_test(sbinfo->si_mntflags, SHWH)))
+ pr_warning("shwh should be used with ro\n");
+ }
+
+ if (au_opt_test((sbinfo->si_mntflags | pending), UDBA_HNOTIFY)
+ && !au_opt_test(sbinfo->si_mntflags, XINO))
+ pr_warning("udba=*notify requires xino\n");
+
+ err = 0;
+ root = sb->s_root;
+ dir = root->d_inode;
+ do_plink = !!au_opt_test(sbinfo->si_mntflags, PLINK);
+ bend = au_sbend(sb);
+ for (bindex = 0; !err && bindex <= bend; bindex++) {
+ skip = 0;
+ h_dir = au_h_iptr(dir, bindex);
+ br = au_sbr(sb, bindex);
+ do_free = 0;
+
+ wbr = br->br_wbr;
+ if (wbr)
+ wbr_wh_read_lock(wbr);
+
+ if (!au_br_writable(br->br_perm)) {
+ do_free = !!wbr;
+ skip = (!wbr
+ || (!wbr->wbr_whbase
+ && !wbr->wbr_plink
+ && !wbr->wbr_orph));
+ } else if (!au_br_wh_linkable(br->br_perm)) {
+ /* skip = (!br->br_whbase && !br->br_orph); */
+ skip = (!wbr || !wbr->wbr_whbase);
+ if (skip && wbr) {
+ if (do_plink)
+ skip = !!wbr->wbr_plink;
+ else
+ skip = !wbr->wbr_plink;
+ }
+ } else {
+ /* skip = (br->br_whbase && br->br_ohph); */
+ skip = (wbr && wbr->wbr_whbase);
+ if (skip) {
+ if (do_plink)
+ skip = !!wbr->wbr_plink;
+ else
+ skip = !wbr->wbr_plink;
+ }
+ }
+ if (wbr)
+ wbr_wh_read_unlock(wbr);
+
+ if (skip)
+ continue;
+
+ hdir = au_hi(dir, bindex);
+ au_hn_imtx_lock_nested(hdir, AuLsc_I_PARENT);
+ if (wbr)
+ wbr_wh_write_lock(wbr);
+ err = au_wh_init(au_h_dptr(root, bindex), br, sb);
+ if (wbr)
+ wbr_wh_write_unlock(wbr);
+ au_hn_imtx_unlock(hdir);
+
+ if (!err && do_free) {
+ kfree(wbr);
+ br->br_wbr = NULL;
+ }
+ }
+
+ return err;
+}
+
+int au_opts_mount(struct super_block *sb, struct au_opts *opts)
+{
+ int err;
+ unsigned int tmp;
+ aufs_bindex_t bindex, bend;
+ struct au_opt *opt;
+ struct au_opt_xino *opt_xino, xino;
+ struct au_sbinfo *sbinfo;
+ struct au_branch *br;
+
+ SiMustWriteLock(sb);
+
+ err = 0;
+ opt_xino = NULL;
+ opt = opts->opt;
+ while (err >= 0 && opt->type != Opt_tail)
+ err = au_opt_simple(sb, opt++, opts);
+ if (err > 0)
+ err = 0;
+ else if (unlikely(err < 0))
+ goto out;
+
+ /* disable xino and udba temporary */
+ sbinfo = au_sbi(sb);
+ tmp = sbinfo->si_mntflags;
+ au_opt_clr(sbinfo->si_mntflags, XINO);
+ au_opt_set_udba(sbinfo->si_mntflags, UDBA_REVAL);
+
+ opt = opts->opt;
+ while (err >= 0 && opt->type != Opt_tail)
+ err = au_opt_br(sb, opt++, opts);
+ if (err > 0)
+ err = 0;
+ else if (unlikely(err < 0))
+ goto out;
+
+ bend = au_sbend(sb);
+ if (unlikely(bend < 0)) {
+ err = -EINVAL;
+ pr_err("no branches\n");
+ goto out;
+ }
+
+ if (au_opt_test(tmp, XINO))
+ au_opt_set(sbinfo->si_mntflags, XINO);
+ opt = opts->opt;
+ while (!err && opt->type != Opt_tail)
+ err = au_opt_xino(sb, opt++, &opt_xino, opts);
+ if (unlikely(err))
+ goto out;
+
+ err = au_opts_verify(sb, sb->s_flags, tmp);
+ if (unlikely(err))
+ goto out;
+
+ /* restore xino */
+ if (au_opt_test(tmp, XINO) && !opt_xino) {
+ xino.file = au_xino_def(sb);
+ err = PTR_ERR(xino.file);
+ if (IS_ERR(xino.file))
+ goto out;
+
+ err = au_xino_set(sb, &xino, /*remount*/0);
+ fput(xino.file);
+ if (unlikely(err))
+ goto out;
+ }
+
+ /* restore udba */
+ tmp &= AuOptMask_UDBA;
+ sbinfo->si_mntflags &= ~AuOptMask_UDBA;
+ sbinfo->si_mntflags |= tmp;
+ bend = au_sbend(sb);
+ for (bindex = 0; bindex <= bend; bindex++) {
+ br = au_sbr(sb, bindex);
+ err = au_hnotify_reset_br(tmp, br, br->br_perm);
+ if (unlikely(err))
+ AuIOErr("hnotify failed on br %d, %d, ignored\n",
+ bindex, err);
+ /* go on even if err */
+ }
+ if (au_opt_test(tmp, UDBA_HNOTIFY)) {
+ struct inode *dir = sb->s_root->d_inode;
+ au_hn_reset(dir, au_hi_flags(dir, /*isdir*/1) & ~AuHi_XINO);
+ }
+
+out:
+ return err;
+}
+
+int au_opts_remount(struct super_block *sb, struct au_opts *opts)
+{
+ int err, rerr;
+ struct inode *dir;
+ struct au_opt_xino *opt_xino;
+ struct au_opt *opt;
+ struct au_sbinfo *sbinfo;
+
+ SiMustWriteLock(sb);
+
+ dir = sb->s_root->d_inode;
+ sbinfo = au_sbi(sb);
+ err = 0;
+ opt_xino = NULL;
+ opt = opts->opt;
+ while (err >= 0 && opt->type != Opt_tail) {
+ err = au_opt_simple(sb, opt, opts);
+ if (!err)
+ err = au_opt_br(sb, opt, opts);
+ if (!err)
+ err = au_opt_xino(sb, opt, &opt_xino, opts);
+ opt++;
+ }
+ if (err > 0)
+ err = 0;
+ AuTraceErr(err);
+ /* go on even err */
+
+ rerr = au_opts_verify(sb, opts->sb_flags, /*pending*/0);
+ if (unlikely(rerr && !err))
+ err = rerr;
+
+ if (au_ftest_opts(opts->flags, TRUNC_XIB)) {
+ rerr = au_xib_trunc(sb);
+ if (unlikely(rerr && !err))
+ err = rerr;
+ }
+
+ /* will be handled by the caller */
+ if (!au_ftest_opts(opts->flags, REFRESH)
+ && (opts->given_udba || au_opt_test(sbinfo->si_mntflags, XINO)))
+ au_fset_opts(opts->flags, REFRESH);
+
+ AuDbg("status 0x%x\n", opts->flags);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+unsigned int au_opt_udba(struct super_block *sb)
+{
+ return au_mntflags(sb) & AuOptMask_UDBA;
+}
diff -urN a/fs/aufs/opts.h b/fs/aufs/opts.h
--- a/fs/aufs/opts.h 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/opts.h 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,209 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * mount options/flags
+ */
+
+#ifndef __AUFS_OPTS_H__
+#define __AUFS_OPTS_H__
+
+#ifdef __KERNEL__
+
+#include <linux/path.h>
+
+struct file;
+struct super_block;
+
+/* ---------------------------------------------------------------------- */
+
+/* mount flags */
+#define AuOpt_XINO 1 /* external inode number bitmap
+ and translation table */
+#define AuOpt_TRUNC_XINO (1 << 1) /* truncate xino files */
+#define AuOpt_UDBA_NONE (1 << 2) /* users direct branch access */
+#define AuOpt_UDBA_REVAL (1 << 3)
+#define AuOpt_UDBA_HNOTIFY (1 << 4)
+#define AuOpt_SHWH (1 << 5) /* show whiteout */
+#define AuOpt_PLINK (1 << 6) /* pseudo-link */
+#define AuOpt_DIRPERM1 (1 << 7) /* unimplemented */
+#define AuOpt_REFROF (1 << 8) /* unimplemented */
+#define AuOpt_ALWAYS_DIROPQ (1 << 9) /* policy to creating diropq */
+#define AuOpt_SUM (1 << 10) /* summation for statfs(2) */
+#define AuOpt_SUM_W (1 << 11) /* unimplemented */
+#define AuOpt_WARN_PERM (1 << 12) /* warn when add-branch */
+#define AuOpt_VERBOSE (1 << 13) /* busy inode when del-branch */
+#define AuOpt_DIO (1 << 14) /* direct io */
+
+#ifndef CONFIG_AUFS_HNOTIFY
+#undef AuOpt_UDBA_HNOTIFY
+#define AuOpt_UDBA_HNOTIFY 0
+#endif
+#ifndef CONFIG_AUFS_SHWH
+#undef AuOpt_SHWH
+#define AuOpt_SHWH 0
+#endif
+
+#define AuOpt_Def (AuOpt_XINO \
+ | AuOpt_UDBA_REVAL \
+ | AuOpt_PLINK \
+ /* | AuOpt_DIRPERM1 */ \
+ | AuOpt_WARN_PERM)
+#define AuOptMask_UDBA (AuOpt_UDBA_NONE \
+ | AuOpt_UDBA_REVAL \
+ | AuOpt_UDBA_HNOTIFY)
+
+#define au_opt_test(flags, name) (flags & AuOpt_##name)
+#define au_opt_set(flags, name) do { \
+ BUILD_BUG_ON(AuOpt_##name & AuOptMask_UDBA); \
+ ((flags) |= AuOpt_##name); \
+} while (0)
+#define au_opt_set_udba(flags, name) do { \
+ (flags) &= ~AuOptMask_UDBA; \
+ ((flags) |= AuOpt_##name); \
+} while (0)
+#define au_opt_clr(flags, name) do { \
+ ((flags) &= ~AuOpt_##name); \
+} while (0)
+
+static inline unsigned int au_opts_plink(unsigned int mntflags)
+{
+#ifdef CONFIG_PROC_FS
+ return mntflags;
+#else
+ return mntflags & ~AuOpt_PLINK;
+#endif
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* policies to select one among multiple writable branches */
+enum {
+ AuWbrCreate_TDP, /* top down parent */
+ AuWbrCreate_RR, /* round robin */
+ AuWbrCreate_MFS, /* most free space */
+ AuWbrCreate_MFSV, /* mfs with seconds */
+ AuWbrCreate_MFSRR, /* mfs then rr */
+ AuWbrCreate_MFSRRV, /* mfs then rr with seconds */
+ AuWbrCreate_PMFS, /* parent and mfs */
+ AuWbrCreate_PMFSV, /* parent and mfs with seconds */
+
+ AuWbrCreate_Def = AuWbrCreate_TDP
+};
+
+enum {
+ AuWbrCopyup_TDP, /* top down parent */
+ AuWbrCopyup_BUP, /* bottom up parent */
+ AuWbrCopyup_BU, /* bottom up */
+
+ AuWbrCopyup_Def = AuWbrCopyup_TDP
+};
+
+/* ---------------------------------------------------------------------- */
+
+struct au_opt_add {
+ aufs_bindex_t bindex;
+ char *pathname;
+ int perm;
+ struct path path;
+};
+
+struct au_opt_del {
+ char *pathname;
+ struct path h_path;
+};
+
+struct au_opt_mod {
+ char *path;
+ int perm;
+ struct dentry *h_root;
+};
+
+struct au_opt_xino {
+ char *path;
+ struct file *file;
+};
+
+struct au_opt_xino_itrunc {
+ aufs_bindex_t bindex;
+};
+
+struct au_opt_wbr_create {
+ int wbr_create;
+ int mfs_second;
+ unsigned long long mfsrr_watermark;
+};
+
+struct au_opt {
+ int type;
+ union {
+ struct au_opt_xino xino;
+ struct au_opt_xino_itrunc xino_itrunc;
+ struct au_opt_add add;
+ struct au_opt_del del;
+ struct au_opt_mod mod;
+ int dirwh;
+ int rdcache;
+ unsigned int rdblk;
+ unsigned int rdhash;
+ int udba;
+ struct au_opt_wbr_create wbr_create;
+ int wbr_copyup;
+ };
+};
+
+/* opts flags */
+#define AuOpts_REMOUNT 1
+#define AuOpts_REFRESH (1 << 1)
+#define AuOpts_TRUNC_XIB (1 << 2)
+#define AuOpts_REFRESH_DYAOP (1 << 3)
+#define au_ftest_opts(flags, name) ((flags) & AuOpts_##name)
+#define au_fset_opts(flags, name) \
+ do { (flags) |= AuOpts_##name; } while (0)
+#define au_fclr_opts(flags, name) \
+ do { (flags) &= ~AuOpts_##name; } while (0)
+
+struct au_opts {
+ struct au_opt *opt;
+ int max_opt;
+
+ unsigned int given_udba;
+ unsigned int flags;
+ unsigned long sb_flags;
+};
+
+/* ---------------------------------------------------------------------- */
+
+char *au_optstr_br_perm(int brperm);
+const char *au_optstr_udba(int udba);
+const char *au_optstr_wbr_copyup(int wbr_copyup);
+const char *au_optstr_wbr_create(int wbr_create);
+
+void au_opts_free(struct au_opts *opts);
+int au_opts_parse(struct super_block *sb, char *str, struct au_opts *opts);
+int au_opts_verify(struct super_block *sb, unsigned long sb_flags,
+ unsigned int pending);
+int au_opts_mount(struct super_block *sb, struct au_opts *opts);
+int au_opts_remount(struct super_block *sb, struct au_opts *opts);
+
+unsigned int au_opt_udba(struct super_block *sb);
+
+/* ---------------------------------------------------------------------- */
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_OPTS_H__ */
diff -urN a/fs/aufs/plink.c b/fs/aufs/plink.c
--- a/fs/aufs/plink.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/plink.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,515 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * pseudo-link
+ */
+
+#include "aufs.h"
+
+/*
+ * the pseudo-link maintenance mode.
+ * during a user process maintains the pseudo-links,
+ * prohibit adding a new plink and branch manipulation.
+ *
+ * Flags
+ * NOPLM:
+ * For entry functions which will handle plink, and i_mutex is already held
+ * in VFS.
+ * They cannot wait and should return an error at once.
+ * Callers has to check the error.
+ * NOPLMW:
+ * For entry functions which will handle plink, but i_mutex is not held
+ * in VFS.
+ * They can wait the plink maintenance mode to finish.
+ *
+ * They behave like F_SETLK and F_SETLKW.
+ * If the caller never handle plink, then both flags are unnecessary.
+ */
+
+int au_plink_maint(struct super_block *sb, int flags)
+{
+ int err;
+ pid_t pid, ppid;
+ struct au_sbinfo *sbi;
+
+ SiMustAnyLock(sb);
+
+ err = 0;
+ if (!au_opt_test(au_mntflags(sb), PLINK))
+ goto out;
+
+ sbi = au_sbi(sb);
+ pid = sbi->si_plink_maint_pid;
+ if (!pid || pid == current->pid)
+ goto out;
+
+ /* todo: it highly depends upon /sbin/mount.aufs */
+ rcu_read_lock();
+ ppid = task_pid_vnr(rcu_dereference(current->real_parent));
+ rcu_read_unlock();
+ if (pid == ppid)
+ goto out;
+
+ if (au_ftest_lock(flags, NOPLMW)) {
+ /* if there is no i_mutex lock in VFS, we don't need to wait */
+ /* AuDebugOn(!lockdep_depth(current)); */
+ while (sbi->si_plink_maint_pid) {
+ si_read_unlock(sb);
+ /* gave up wake_up_bit() */
+ wait_event(sbi->si_plink_wq, !sbi->si_plink_maint_pid);
+
+ if (au_ftest_lock(flags, FLUSH))
+ au_nwt_flush(&sbi->si_nowait);
+ si_noflush_read_lock(sb);
+ }
+ } else if (au_ftest_lock(flags, NOPLM)) {
+ AuDbg("ppid %d, pid %d\n", ppid, pid);
+ err = -EAGAIN;
+ }
+
+out:
+ return err;
+}
+
+void au_plink_maint_leave(struct au_sbinfo *sbinfo)
+{
+ spin_lock(&sbinfo->si_plink_maint_lock);
+ sbinfo->si_plink_maint_pid = 0;
+ spin_unlock(&sbinfo->si_plink_maint_lock);
+ wake_up_all(&sbinfo->si_plink_wq);
+}
+
+int au_plink_maint_enter(struct super_block *sb)
+{
+ int err;
+ struct au_sbinfo *sbinfo;
+
+ err = 0;
+ sbinfo = au_sbi(sb);
+ /* make sure i am the only one in this fs */
+ si_write_lock(sb, AuLock_FLUSH);
+ if (au_opt_test(au_mntflags(sb), PLINK)) {
+ spin_lock(&sbinfo->si_plink_maint_lock);
+ if (!sbinfo->si_plink_maint_pid)
+ sbinfo->si_plink_maint_pid = current->pid;
+ else
+ err = -EBUSY;
+ spin_unlock(&sbinfo->si_plink_maint_lock);
+ }
+ si_write_unlock(sb);
+
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct pseudo_link {
+ union {
+ struct list_head list;
+ struct rcu_head rcu;
+ };
+ struct inode *inode;
+};
+
+#ifdef CONFIG_AUFS_DEBUG
+void au_plink_list(struct super_block *sb)
+{
+ struct au_sbinfo *sbinfo;
+ struct list_head *plink_list;
+ struct pseudo_link *plink;
+
+ SiMustAnyLock(sb);
+
+ sbinfo = au_sbi(sb);
+ AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK));
+ AuDebugOn(au_plink_maint(sb, AuLock_NOPLM));
+
+ plink_list = &sbinfo->si_plink.head;
+ rcu_read_lock();
+ list_for_each_entry_rcu(plink, plink_list, list)
+ AuDbg("%lu\n", plink->inode->i_ino);
+ rcu_read_unlock();
+}
+#endif
+
+/* is the inode pseudo-linked? */
+int au_plink_test(struct inode *inode)
+{
+ int found;
+ struct au_sbinfo *sbinfo;
+ struct list_head *plink_list;
+ struct pseudo_link *plink;
+
+ sbinfo = au_sbi(inode->i_sb);
+ AuRwMustAnyLock(&sbinfo->si_rwsem);
+ AuDebugOn(!au_opt_test(au_mntflags(inode->i_sb), PLINK));
+ AuDebugOn(au_plink_maint(inode->i_sb, AuLock_NOPLM));
+
+ found = 0;
+ plink_list = &sbinfo->si_plink.head;
+ rcu_read_lock();
+ list_for_each_entry_rcu(plink, plink_list, list)
+ if (plink->inode == inode) {
+ found = 1;
+ break;
+ }
+ rcu_read_unlock();
+ return found;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * generate a name for plink.
+ * the file will be stored under AUFS_WH_PLINKDIR.
+ */
+/* 20 is max digits length of ulong 64 */
+#define PLINK_NAME_LEN ((20 + 1) * 2)
+
+static int plink_name(char *name, int len, struct inode *inode,
+ aufs_bindex_t bindex)
+{
+ int rlen;
+ struct inode *h_inode;
+
+ h_inode = au_h_iptr(inode, bindex);
+ rlen = snprintf(name, len, "%lu.%lu", inode->i_ino, h_inode->i_ino);
+ return rlen;
+}
+
+struct au_do_plink_lkup_args {
+ struct dentry **errp;
+ struct qstr *tgtname;
+ struct dentry *h_parent;
+ struct au_branch *br;
+};
+
+static struct dentry *au_do_plink_lkup(struct qstr *tgtname,
+ struct dentry *h_parent,
+ struct au_branch *br)
+{
+ struct dentry *h_dentry;
+ struct mutex *h_mtx;
+
+ h_mtx = &h_parent->d_inode->i_mutex;
+ mutex_lock_nested(h_mtx, AuLsc_I_CHILD2);
+ h_dentry = au_lkup_one(tgtname, h_parent, br, /*nd*/NULL);
+ mutex_unlock(h_mtx);
+ return h_dentry;
+}
+
+static void au_call_do_plink_lkup(void *args)
+{
+ struct au_do_plink_lkup_args *a = args;
+ *a->errp = au_do_plink_lkup(a->tgtname, a->h_parent, a->br);
+}
+
+/* lookup the plink-ed @inode under the branch at @bindex */
+struct dentry *au_plink_lkup(struct inode *inode, aufs_bindex_t bindex)
+{
+ struct dentry *h_dentry, *h_parent;
+ struct au_branch *br;
+ struct inode *h_dir;
+ int wkq_err;
+ char a[PLINK_NAME_LEN];
+ struct qstr tgtname = {
+ .name = a
+ };
+
+ AuDebugOn(au_plink_maint(inode->i_sb, AuLock_NOPLM));
+
+ br = au_sbr(inode->i_sb, bindex);
+ h_parent = br->br_wbr->wbr_plink;
+ h_dir = h_parent->d_inode;
+ tgtname.len = plink_name(a, sizeof(a), inode, bindex);
+
+ if (current_fsuid()) {
+ struct au_do_plink_lkup_args args = {
+ .errp = &h_dentry,
+ .tgtname = &tgtname,
+ .h_parent = h_parent,
+ .br = br
+ };
+
+ wkq_err = au_wkq_wait(au_call_do_plink_lkup, &args);
+ if (unlikely(wkq_err))
+ h_dentry = ERR_PTR(wkq_err);
+ } else
+ h_dentry = au_do_plink_lkup(&tgtname, h_parent, br);
+
+ return h_dentry;
+}
+
+/* create a pseudo-link */
+static int do_whplink(struct qstr *tgt, struct dentry *h_parent,
+ struct dentry *h_dentry, struct au_branch *br)
+{
+ int err;
+ struct path h_path = {
+ .mnt = br->br_mnt
+ };
+ struct inode *h_dir;
+
+ h_dir = h_parent->d_inode;
+ mutex_lock_nested(&h_dir->i_mutex, AuLsc_I_CHILD2);
+again:
+ h_path.dentry = au_lkup_one(tgt, h_parent, br, /*nd*/NULL);
+ err = PTR_ERR(h_path.dentry);
+ if (IS_ERR(h_path.dentry))
+ goto out;
+
+ err = 0;
+ /* wh.plink dir is not monitored */
+ /* todo: is it really safe? */
+ if (h_path.dentry->d_inode
+ && h_path.dentry->d_inode != h_dentry->d_inode) {
+ err = vfsub_unlink(h_dir, &h_path, /*force*/0);
+ dput(h_path.dentry);
+ h_path.dentry = NULL;
+ if (!err)
+ goto again;
+ }
+ if (!err && !h_path.dentry->d_inode)
+ err = vfsub_link(h_dentry, h_dir, &h_path);
+ dput(h_path.dentry);
+
+out:
+ mutex_unlock(&h_dir->i_mutex);
+ return err;
+}
+
+struct do_whplink_args {
+ int *errp;
+ struct qstr *tgt;
+ struct dentry *h_parent;
+ struct dentry *h_dentry;
+ struct au_branch *br;
+};
+
+static void call_do_whplink(void *args)
+{
+ struct do_whplink_args *a = args;
+ *a->errp = do_whplink(a->tgt, a->h_parent, a->h_dentry, a->br);
+}
+
+static int whplink(struct dentry *h_dentry, struct inode *inode,
+ aufs_bindex_t bindex, struct au_branch *br)
+{
+ int err, wkq_err;
+ struct au_wbr *wbr;
+ struct dentry *h_parent;
+ struct inode *h_dir;
+ char a[PLINK_NAME_LEN];
+ struct qstr tgtname = {
+ .name = a
+ };
+
+ wbr = au_sbr(inode->i_sb, bindex)->br_wbr;
+ h_parent = wbr->wbr_plink;
+ h_dir = h_parent->d_inode;
+ tgtname.len = plink_name(a, sizeof(a), inode, bindex);
+
+ /* always superio. */
+ if (current_fsuid()) {
+ struct do_whplink_args args = {
+ .errp = &err,
+ .tgt = &tgtname,
+ .h_parent = h_parent,
+ .h_dentry = h_dentry,
+ .br = br
+ };
+ wkq_err = au_wkq_wait(call_do_whplink, &args);
+ if (unlikely(wkq_err))
+ err = wkq_err;
+ } else
+ err = do_whplink(&tgtname, h_parent, h_dentry, br);
+
+ return err;
+}
+
+/* free a single plink */
+static void do_put_plink(struct pseudo_link *plink, int do_del)
+{
+ if (do_del)
+ list_del(&plink->list);
+ iput(plink->inode);
+ kfree(plink);
+}
+
+static void do_put_plink_rcu(struct rcu_head *rcu)
+{
+ struct pseudo_link *plink;
+
+ plink = container_of(rcu, struct pseudo_link, rcu);
+ iput(plink->inode);
+ kfree(plink);
+}
+
+/*
+ * create a new pseudo-link for @h_dentry on @bindex.
+ * the linked inode is held in aufs @inode.
+ */
+void au_plink_append(struct inode *inode, aufs_bindex_t bindex,
+ struct dentry *h_dentry)
+{
+ struct super_block *sb;
+ struct au_sbinfo *sbinfo;
+ struct list_head *plink_list;
+ struct pseudo_link *plink, *tmp;
+ int found, err, cnt;
+
+ sb = inode->i_sb;
+ sbinfo = au_sbi(sb);
+ AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK));
+ AuDebugOn(au_plink_maint(sb, AuLock_NOPLM));
+
+ cnt = 0;
+ found = 0;
+ plink_list = &sbinfo->si_plink.head;
+ rcu_read_lock();
+ list_for_each_entry_rcu(plink, plink_list, list) {
+ cnt++;
+ if (plink->inode == inode) {
+ found = 1;
+ break;
+ }
+ }
+ rcu_read_unlock();
+ if (found)
+ return;
+
+ tmp = kmalloc(sizeof(*plink), GFP_NOFS);
+ if (tmp)
+ tmp->inode = au_igrab(inode);
+ else {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ spin_lock(&sbinfo->si_plink.spin);
+ list_for_each_entry(plink, plink_list, list) {
+ if (plink->inode == inode) {
+ found = 1;
+ break;
+ }
+ }
+ if (!found)
+ list_add_rcu(&tmp->list, plink_list);
+ spin_unlock(&sbinfo->si_plink.spin);
+ if (!found) {
+ cnt++;
+ WARN_ONCE(cnt > AUFS_PLINK_WARN,
+ "unexpectedly many pseudo links, %d\n", cnt);
+ err = whplink(h_dentry, inode, bindex, au_sbr(sb, bindex));
+ } else {
+ do_put_plink(tmp, 0);
+ return;
+ }
+
+out:
+ if (unlikely(err)) {
+ pr_warning("err %d, damaged pseudo link.\n", err);
+ if (tmp) {
+ au_spl_del_rcu(&tmp->list, &sbinfo->si_plink);
+ call_rcu(&tmp->rcu, do_put_plink_rcu);
+ }
+ }
+}
+
+/* free all plinks */
+void au_plink_put(struct super_block *sb, int verbose)
+{
+ struct au_sbinfo *sbinfo;
+ struct list_head *plink_list;
+ struct pseudo_link *plink, *tmp;
+
+ SiMustWriteLock(sb);
+
+ sbinfo = au_sbi(sb);
+ AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK));
+ AuDebugOn(au_plink_maint(sb, AuLock_NOPLM));
+
+ plink_list = &sbinfo->si_plink.head;
+ /* no spin_lock since sbinfo is write-locked */
+ WARN(verbose && !list_empty(plink_list), "pseudo-link is not flushed");
+ list_for_each_entry_safe(plink, tmp, plink_list, list)
+ do_put_plink(plink, 0);
+ INIT_LIST_HEAD(plink_list);
+}
+
+void au_plink_clean(struct super_block *sb, int verbose)
+{
+ struct dentry *root;
+
+ root = sb->s_root;
+ aufs_write_lock(root);
+ if (au_opt_test(au_mntflags(sb), PLINK))
+ au_plink_put(sb, verbose);
+ aufs_write_unlock(root);
+}
+
+/* free the plinks on a branch specified by @br_id */
+void au_plink_half_refresh(struct super_block *sb, aufs_bindex_t br_id)
+{
+ struct au_sbinfo *sbinfo;
+ struct list_head *plink_list;
+ struct pseudo_link *plink, *tmp;
+ struct inode *inode;
+ aufs_bindex_t bstart, bend, bindex;
+ unsigned char do_put;
+
+ SiMustWriteLock(sb);
+
+ sbinfo = au_sbi(sb);
+ AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK));
+ AuDebugOn(au_plink_maint(sb, AuLock_NOPLM));
+
+ plink_list = &sbinfo->si_plink.head;
+ /* no spin_lock since sbinfo is write-locked */
+ list_for_each_entry_safe(plink, tmp, plink_list, list) {
+ do_put = 0;
+ inode = au_igrab(plink->inode);
+ ii_write_lock_child(inode);
+ bstart = au_ibstart(inode);
+ bend = au_ibend(inode);
+ if (bstart >= 0) {
+ for (bindex = bstart; bindex <= bend; bindex++) {
+ if (!au_h_iptr(inode, bindex)
+ || au_ii_br_id(inode, bindex) != br_id)
+ continue;
+ au_set_h_iptr(inode, bindex, NULL, 0);
+ do_put = 1;
+ break;
+ }
+ } else
+ do_put_plink(plink, 1);
+
+ if (do_put) {
+ for (bindex = bstart; bindex <= bend; bindex++)
+ if (au_h_iptr(inode, bindex)) {
+ do_put = 0;
+ break;
+ }
+ if (do_put)
+ do_put_plink(plink, 1);
+ }
+ ii_write_unlock(inode);
+ iput(inode);
+ }
+}
diff -urN a/fs/aufs/poll.c b/fs/aufs/poll.c
--- a/fs/aufs/poll.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/poll.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * poll operation
+ * There is only one filesystem which implements ->poll operation, currently.
+ */
+
+#include "aufs.h"
+
+unsigned int aufs_poll(struct file *file, poll_table *wait)
+{
+ unsigned int mask;
+ int err;
+ struct file *h_file;
+ struct dentry *dentry;
+ struct super_block *sb;
+
+ /* We should pretend an error happened. */
+ mask = POLLERR /* | POLLIN | POLLOUT */;
+ dentry = file->f_dentry;
+ sb = dentry->d_sb;
+ si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW);
+ err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/0);
+ if (unlikely(err))
+ goto out;
+
+ /* it is not an error if h_file has no operation */
+ mask = DEFAULT_POLLMASK;
+ h_file = au_hf_top(file);
+ if (h_file->f_op && h_file->f_op->poll)
+ mask = h_file->f_op->poll(h_file, wait);
+
+ di_read_unlock(dentry, AuLock_IR);
+ fi_read_unlock(file);
+
+out:
+ si_read_unlock(sb);
+ AuTraceErr((int)mask);
+ return mask;
+}
diff -urN a/fs/aufs/procfs.c b/fs/aufs/procfs.c
--- a/fs/aufs/procfs.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/procfs.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,170 @@
+/*
+ * Copyright (C) 2010-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * procfs interfaces
+ */
+
+#include <linux/proc_fs.h>
+#include "aufs.h"
+
+static int au_procfs_plm_release(struct inode *inode, struct file *file)
+{
+ struct au_sbinfo *sbinfo;
+
+ sbinfo = file->private_data;
+ if (sbinfo) {
+ au_plink_maint_leave(sbinfo);
+ kobject_put(&sbinfo->si_kobj);
+ }
+
+ return 0;
+}
+
+static void au_procfs_plm_write_clean(struct file *file)
+{
+ struct au_sbinfo *sbinfo;
+
+ sbinfo = file->private_data;
+ if (sbinfo)
+ au_plink_clean(sbinfo->si_sb, /*verbose*/0);
+}
+
+static int au_procfs_plm_write_si(struct file *file, unsigned long id)
+{
+ int err;
+ struct super_block *sb;
+ struct au_sbinfo *sbinfo;
+
+ err = -EBUSY;
+ if (unlikely(file->private_data))
+ goto out;
+
+ sb = NULL;
+ /* don't use au_sbilist_lock() here */
+ spin_lock(&au_sbilist.spin);
+ list_for_each_entry(sbinfo, &au_sbilist.head, si_list)
+ if (id == sysaufs_si_id(sbinfo)) {
+ kobject_get(&sbinfo->si_kobj);
+ sb = sbinfo->si_sb;
+ break;
+ }
+ spin_unlock(&au_sbilist.spin);
+
+ err = -EINVAL;
+ if (unlikely(!sb))
+ goto out;
+
+ err = au_plink_maint_enter(sb);
+ if (!err)
+ /* keep kobject_get() */
+ file->private_data = sbinfo;
+ else
+ kobject_put(&sbinfo->si_kobj);
+out:
+ return err;
+}
+
+/*
+ * Accept a valid "si=xxxx" only.
+ * Once it is accepted successfully, accept "clean" too.
+ */
+static ssize_t au_procfs_plm_write(struct file *file, const char __user *ubuf,
+ size_t count, loff_t *ppos)
+{
+ ssize_t err;
+ unsigned long id;
+ /* last newline is allowed */
+ char buf[3 + sizeof(unsigned long) * 2 + 1];
+
+ err = -EACCES;
+ if (unlikely(!capable(CAP_SYS_ADMIN)))
+ goto out;
+
+ err = -EINVAL;
+ if (unlikely(count > sizeof(buf)))
+ goto out;
+
+ err = copy_from_user(buf, ubuf, count);
+ if (unlikely(err)) {
+ err = -EFAULT;
+ goto out;
+ }
+ buf[count] = 0;
+
+ err = -EINVAL;
+ if (!strcmp("clean", buf)) {
+ au_procfs_plm_write_clean(file);
+ goto out_success;
+ } else if (unlikely(strncmp("si=", buf, 3)))
+ goto out;
+
+ err = kstrtoul(buf + 3, 16, &id);
+ if (unlikely(err))
+ goto out;
+
+ err = au_procfs_plm_write_si(file, id);
+ if (unlikely(err))
+ goto out;
+
+out_success:
+ err = count; /* success */
+out:
+ return err;
+}
+
+static const struct file_operations au_procfs_plm_fop = {
+ .write = au_procfs_plm_write,
+ .release = au_procfs_plm_release,
+ .owner = THIS_MODULE
+};
+
+/* ---------------------------------------------------------------------- */
+
+static struct proc_dir_entry *au_procfs_dir;
+
+void au_procfs_fin(void)
+{
+ remove_proc_entry(AUFS_PLINK_MAINT_NAME, au_procfs_dir);
+ remove_proc_entry(AUFS_PLINK_MAINT_DIR, NULL);
+}
+
+int __init au_procfs_init(void)
+{
+ int err;
+ struct proc_dir_entry *entry;
+
+ err = -ENOMEM;
+ au_procfs_dir = proc_mkdir(AUFS_PLINK_MAINT_DIR, NULL);
+ if (unlikely(!au_procfs_dir))
+ goto out;
+
+ entry = proc_create(AUFS_PLINK_MAINT_NAME, S_IFREG | S_IWUSR,
+ au_procfs_dir, &au_procfs_plm_fop);
+ if (unlikely(!entry))
+ goto out_dir;
+
+ err = 0;
+ goto out; /* success */
+
+
+out_dir:
+ remove_proc_entry(AUFS_PLINK_MAINT_DIR, NULL);
+out:
+ return err;
+}
diff -urN a/fs/aufs/rdu.c b/fs/aufs/rdu.c
--- a/fs/aufs/rdu.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/rdu.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,383 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * readdir in userspace.
+ */
+
+#include <linux/compat.h>
+#include <linux/fs_stack.h>
+#include <linux/security.h>
+#include "aufs.h"
+
+/* bits for struct aufs_rdu.flags */
+#define AuRdu_CALLED 1
+#define AuRdu_CONT (1 << 1)
+#define AuRdu_FULL (1 << 2)
+#define au_ftest_rdu(flags, name) ((flags) & AuRdu_##name)
+#define au_fset_rdu(flags, name) \
+ do { (flags) |= AuRdu_##name; } while (0)
+#define au_fclr_rdu(flags, name) \
+ do { (flags) &= ~AuRdu_##name; } while (0)
+
+struct au_rdu_arg {
+ struct aufs_rdu *rdu;
+ union au_rdu_ent_ul ent;
+ unsigned long end;
+
+ struct super_block *sb;
+ int err;
+};
+
+static int au_rdu_fill(void *__arg, const char *name, int nlen,
+ loff_t offset, u64 h_ino, unsigned int d_type)
+{
+ int err, len;
+ struct au_rdu_arg *arg = __arg;
+ struct aufs_rdu *rdu = arg->rdu;
+ struct au_rdu_ent ent;
+
+ err = 0;
+ arg->err = 0;
+ au_fset_rdu(rdu->cookie.flags, CALLED);
+ len = au_rdu_len(nlen);
+ if (arg->ent.ul + len < arg->end) {
+ ent.ino = h_ino;
+ ent.bindex = rdu->cookie.bindex;
+ ent.type = d_type;
+ ent.nlen = nlen;
+ if (unlikely(nlen > AUFS_MAX_NAMELEN))
+ ent.type = DT_UNKNOWN;
+
+ /* unnecessary to support mmap_sem since this is a dir */
+ err = -EFAULT;
+ if (copy_to_user(arg->ent.e, &ent, sizeof(ent)))
+ goto out;
+ if (copy_to_user(arg->ent.e->name, name, nlen))
+ goto out;
+ /* the terminating NULL */
+ if (__put_user(0, arg->ent.e->name + nlen))
+ goto out;
+ err = 0;
+ /* AuDbg("%p, %.*s\n", arg->ent.p, nlen, name); */
+ arg->ent.ul += len;
+ rdu->rent++;
+ } else {
+ err = -EFAULT;
+ au_fset_rdu(rdu->cookie.flags, FULL);
+ rdu->full = 1;
+ rdu->tail = arg->ent;
+ }
+
+out:
+ /* AuTraceErr(err); */
+ return err;
+}
+
+static int au_rdu_do(struct file *h_file, struct au_rdu_arg *arg)
+{
+ int err;
+ loff_t offset;
+ struct au_rdu_cookie *cookie = &arg->rdu->cookie;
+
+ offset = vfsub_llseek(h_file, cookie->h_pos, SEEK_SET);
+ err = offset;
+ if (unlikely(offset != cookie->h_pos))
+ goto out;
+
+ err = 0;
+ do {
+ arg->err = 0;
+ au_fclr_rdu(cookie->flags, CALLED);
+ /* smp_mb(); */
+ err = vfsub_readdir(h_file, au_rdu_fill, arg);
+ if (err >= 0)
+ err = arg->err;
+ } while (!err
+ && au_ftest_rdu(cookie->flags, CALLED)
+ && !au_ftest_rdu(cookie->flags, FULL));
+ cookie->h_pos = h_file->f_pos;
+
+out:
+ AuTraceErr(err);
+ return err;
+}
+
+static int au_rdu(struct file *file, struct aufs_rdu *rdu)
+{
+ int err;
+ aufs_bindex_t bend;
+ struct au_rdu_arg arg;
+ struct dentry *dentry;
+ struct inode *inode;
+ struct file *h_file;
+ struct au_rdu_cookie *cookie = &rdu->cookie;
+
+ err = !access_ok(VERIFY_WRITE, rdu->ent.e, rdu->sz);
+ if (unlikely(err)) {
+ err = -EFAULT;
+ AuTraceErr(err);
+ goto out;
+ }
+ rdu->rent = 0;
+ rdu->tail = rdu->ent;
+ rdu->full = 0;
+ arg.rdu = rdu;
+ arg.ent = rdu->ent;
+ arg.end = arg.ent.ul;
+ arg.end += rdu->sz;
+
+ err = -ENOTDIR;
+ if (unlikely(!file->f_op || !file->f_op->readdir))
+ goto out;
+
+ err = security_file_permission(file, MAY_READ);
+ AuTraceErr(err);
+ if (unlikely(err))
+ goto out;
+
+ dentry = file->f_dentry;
+ inode = dentry->d_inode;
+#if 1
+ mutex_lock(&inode->i_mutex);
+#else
+ err = mutex_lock_killable(&inode->i_mutex);
+ AuTraceErr(err);
+ if (unlikely(err))
+ goto out;
+#endif
+
+ arg.sb = inode->i_sb;
+ err = si_read_lock(arg.sb, AuLock_FLUSH | AuLock_NOPLM);
+ if (unlikely(err))
+ goto out_mtx;
+ err = au_alive_dir(dentry);
+ if (unlikely(err))
+ goto out_si;
+ /* todo: reval? */
+ fi_read_lock(file);
+
+ err = -EAGAIN;
+ if (unlikely(au_ftest_rdu(cookie->flags, CONT)
+ && cookie->generation != au_figen(file)))
+ goto out_unlock;
+
+ err = 0;
+ if (!rdu->blk) {
+ rdu->blk = au_sbi(arg.sb)->si_rdblk;
+ if (!rdu->blk)
+ rdu->blk = au_dir_size(file, /*dentry*/NULL);
+ }
+ bend = au_fbstart(file);
+ if (cookie->bindex < bend)
+ cookie->bindex = bend;
+ bend = au_fbend_dir(file);
+ /* AuDbg("b%d, b%d\n", cookie->bindex, bend); */
+ for (; !err && cookie->bindex <= bend;
+ cookie->bindex++, cookie->h_pos = 0) {
+ h_file = au_hf_dir(file, cookie->bindex);
+ if (!h_file)
+ continue;
+
+ au_fclr_rdu(cookie->flags, FULL);
+ err = au_rdu_do(h_file, &arg);
+ AuTraceErr(err);
+ if (unlikely(au_ftest_rdu(cookie->flags, FULL) || err))
+ break;
+ }
+ AuDbg("rent %llu\n", rdu->rent);
+
+ if (!err && !au_ftest_rdu(cookie->flags, CONT)) {
+ rdu->shwh = !!au_opt_test(au_sbi(arg.sb)->si_mntflags, SHWH);
+ au_fset_rdu(cookie->flags, CONT);
+ cookie->generation = au_figen(file);
+ }
+
+ ii_read_lock_child(inode);
+ fsstack_copy_attr_atime(inode, au_h_iptr(inode, au_ibstart(inode)));
+ ii_read_unlock(inode);
+
+out_unlock:
+ fi_read_unlock(file);
+out_si:
+ si_read_unlock(arg.sb);
+out_mtx:
+ mutex_unlock(&inode->i_mutex);
+out:
+ AuTraceErr(err);
+ return err;
+}
+
+static int au_rdu_ino(struct file *file, struct aufs_rdu *rdu)
+{
+ int err;
+ ino_t ino;
+ unsigned long long nent;
+ union au_rdu_ent_ul *u;
+ struct au_rdu_ent ent;
+ struct super_block *sb;
+
+ err = 0;
+ nent = rdu->nent;
+ u = &rdu->ent;
+ sb = file->f_dentry->d_sb;
+ si_read_lock(sb, AuLock_FLUSH);
+ while (nent-- > 0) {
+ /* unnecessary to support mmap_sem since this is a dir */
+ err = copy_from_user(&ent, u->e, sizeof(ent));
+ if (!err)
+ err = !access_ok(VERIFY_WRITE, &u->e->ino, sizeof(ino));
+ if (unlikely(err)) {
+ err = -EFAULT;
+ AuTraceErr(err);
+ break;
+ }
+
+ /* AuDbg("b%d, i%llu\n", ent.bindex, ent.ino); */
+ if (!ent.wh)
+ err = au_ino(sb, ent.bindex, ent.ino, ent.type, &ino);
+ else
+ err = au_wh_ino(sb, ent.bindex, ent.ino, ent.type,
+ &ino);
+ if (unlikely(err)) {
+ AuTraceErr(err);
+ break;
+ }
+
+ err = __put_user(ino, &u->e->ino);
+ if (unlikely(err)) {
+ err = -EFAULT;
+ AuTraceErr(err);
+ break;
+ }
+ u->ul += au_rdu_len(ent.nlen);
+ }
+ si_read_unlock(sb);
+
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int au_rdu_verify(struct aufs_rdu *rdu)
+{
+ AuDbg("rdu{%llu, %p, %u | %u | %llu, %u, %u | "
+ "%llu, b%d, 0x%x, g%u}\n",
+ rdu->sz, rdu->ent.e, rdu->verify[AufsCtlRduV_SZ],
+ rdu->blk,
+ rdu->rent, rdu->shwh, rdu->full,
+ rdu->cookie.h_pos, rdu->cookie.bindex, rdu->cookie.flags,
+ rdu->cookie.generation);
+
+ if (rdu->verify[AufsCtlRduV_SZ] == sizeof(*rdu))
+ return 0;
+
+ AuDbg("%u:%u\n",
+ rdu->verify[AufsCtlRduV_SZ], (unsigned int)sizeof(*rdu));
+ return -EINVAL;
+}
+
+long au_rdu_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ long err, e;
+ struct aufs_rdu rdu;
+ void __user *p = (void __user *)arg;
+
+ err = copy_from_user(&rdu, p, sizeof(rdu));
+ if (unlikely(err)) {
+ err = -EFAULT;
+ AuTraceErr(err);
+ goto out;
+ }
+ err = au_rdu_verify(&rdu);
+ if (unlikely(err))
+ goto out;
+
+ switch (cmd) {
+ case AUFS_CTL_RDU:
+ err = au_rdu(file, &rdu);
+ if (unlikely(err))
+ break;
+
+ e = copy_to_user(p, &rdu, sizeof(rdu));
+ if (unlikely(e)) {
+ err = -EFAULT;
+ AuTraceErr(err);
+ }
+ break;
+ case AUFS_CTL_RDU_INO:
+ err = au_rdu_ino(file, &rdu);
+ break;
+
+ default:
+ /* err = -ENOTTY; */
+ err = -EINVAL;
+ }
+
+out:
+ AuTraceErr(err);
+ return err;
+}
+
+#ifdef CONFIG_COMPAT
+long au_rdu_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ long err, e;
+ struct aufs_rdu rdu;
+ void __user *p = compat_ptr(arg);
+
+ /* todo: get_user()? */
+ err = copy_from_user(&rdu, p, sizeof(rdu));
+ if (unlikely(err)) {
+ err = -EFAULT;
+ AuTraceErr(err);
+ goto out;
+ }
+ rdu.ent.e = compat_ptr(rdu.ent.ul);
+ err = au_rdu_verify(&rdu);
+ if (unlikely(err))
+ goto out;
+
+ switch (cmd) {
+ case AUFS_CTL_RDU:
+ err = au_rdu(file, &rdu);
+ if (unlikely(err))
+ break;
+
+ rdu.ent.ul = ptr_to_compat(rdu.ent.e);
+ rdu.tail.ul = ptr_to_compat(rdu.tail.e);
+ e = copy_to_user(p, &rdu, sizeof(rdu));
+ if (unlikely(e)) {
+ err = -EFAULT;
+ AuTraceErr(err);
+ }
+ break;
+ case AUFS_CTL_RDU_INO:
+ err = au_rdu_ino(file, &rdu);
+ break;
+
+ default:
+ /* err = -ENOTTY; */
+ err = -EINVAL;
+ }
+
+out:
+ AuTraceErr(err);
+ return err;
+}
+#endif
diff -urN a/fs/aufs/rwsem.h b/fs/aufs/rwsem.h
--- a/fs/aufs/rwsem.h 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/rwsem.h 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,188 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * simple read-write semaphore wrappers
+ */
+
+#ifndef __AUFS_RWSEM_H__
+#define __AUFS_RWSEM_H__
+
+#ifdef __KERNEL__
+
+#include "debug.h"
+
+struct au_rwsem {
+ struct rw_semaphore rwsem;
+#ifdef CONFIG_AUFS_DEBUG
+ /* just for debugging, not almighty counter */
+ atomic_t rcnt, wcnt;
+#endif
+};
+
+#ifdef CONFIG_AUFS_DEBUG
+#define AuDbgCntInit(rw) do { \
+ atomic_set(&(rw)->rcnt, 0); \
+ atomic_set(&(rw)->wcnt, 0); \
+ smp_mb(); /* atomic set */ \
+} while (0)
+
+#define AuDbgRcntInc(rw) atomic_inc(&(rw)->rcnt)
+#define AuDbgRcntDec(rw) WARN_ON(atomic_dec_return(&(rw)->rcnt) < 0)
+#define AuDbgWcntInc(rw) atomic_inc(&(rw)->wcnt)
+#define AuDbgWcntDec(rw) WARN_ON(atomic_dec_return(&(rw)->wcnt) < 0)
+#else
+#define AuDbgCntInit(rw) do {} while (0)
+#define AuDbgRcntInc(rw) do {} while (0)
+#define AuDbgRcntDec(rw) do {} while (0)
+#define AuDbgWcntInc(rw) do {} while (0)
+#define AuDbgWcntDec(rw) do {} while (0)
+#endif /* CONFIG_AUFS_DEBUG */
+
+/* to debug easier, do not make them inlined functions */
+#define AuRwMustNoWaiters(rw) AuDebugOn(!list_empty(&(rw)->rwsem.wait_list))
+/* rwsem_is_locked() is unusable */
+#define AuRwMustReadLock(rw) AuDebugOn(atomic_read(&(rw)->rcnt) <= 0)
+#define AuRwMustWriteLock(rw) AuDebugOn(atomic_read(&(rw)->wcnt) <= 0)
+#define AuRwMustAnyLock(rw) AuDebugOn(atomic_read(&(rw)->rcnt) <= 0 \
+ && atomic_read(&(rw)->wcnt) <= 0)
+#define AuRwDestroy(rw) AuDebugOn(atomic_read(&(rw)->rcnt) \
+ || atomic_read(&(rw)->wcnt))
+
+#define au_rw_class(rw, key) lockdep_set_class(&(rw)->rwsem, key)
+
+static inline void au_rw_init(struct au_rwsem *rw)
+{
+ AuDbgCntInit(rw);
+ init_rwsem(&rw->rwsem);
+}
+
+static inline void au_rw_init_wlock(struct au_rwsem *rw)
+{
+ au_rw_init(rw);
+ down_write(&rw->rwsem);
+ AuDbgWcntInc(rw);
+}
+
+static inline void au_rw_init_wlock_nested(struct au_rwsem *rw,
+ unsigned int lsc)
+{
+ au_rw_init(rw);
+ down_write_nested(&rw->rwsem, lsc);
+ AuDbgWcntInc(rw);
+}
+
+static inline void au_rw_read_lock(struct au_rwsem *rw)
+{
+ down_read(&rw->rwsem);
+ AuDbgRcntInc(rw);
+}
+
+static inline void au_rw_read_lock_nested(struct au_rwsem *rw, unsigned int lsc)
+{
+ down_read_nested(&rw->rwsem, lsc);
+ AuDbgRcntInc(rw);
+}
+
+static inline void au_rw_read_unlock(struct au_rwsem *rw)
+{
+ AuRwMustReadLock(rw);
+ AuDbgRcntDec(rw);
+ up_read(&rw->rwsem);
+}
+
+static inline void au_rw_dgrade_lock(struct au_rwsem *rw)
+{
+ AuRwMustWriteLock(rw);
+ AuDbgRcntInc(rw);
+ AuDbgWcntDec(rw);
+ downgrade_write(&rw->rwsem);
+}
+
+static inline void au_rw_write_lock(struct au_rwsem *rw)
+{
+ down_write(&rw->rwsem);
+ AuDbgWcntInc(rw);
+}
+
+static inline void au_rw_write_lock_nested(struct au_rwsem *rw,
+ unsigned int lsc)
+{
+ down_write_nested(&rw->rwsem, lsc);
+ AuDbgWcntInc(rw);
+}
+
+static inline void au_rw_write_unlock(struct au_rwsem *rw)
+{
+ AuRwMustWriteLock(rw);
+ AuDbgWcntDec(rw);
+ up_write(&rw->rwsem);
+}
+
+/* why is not _nested version defined */
+static inline int au_rw_read_trylock(struct au_rwsem *rw)
+{
+ int ret = down_read_trylock(&rw->rwsem);
+ if (ret)
+ AuDbgRcntInc(rw);
+ return ret;
+}
+
+static inline int au_rw_write_trylock(struct au_rwsem *rw)
+{
+ int ret = down_write_trylock(&rw->rwsem);
+ if (ret)
+ AuDbgWcntInc(rw);
+ return ret;
+}
+
+#undef AuDbgCntInit
+#undef AuDbgRcntInc
+#undef AuDbgRcntDec
+#undef AuDbgWcntInc
+#undef AuDbgWcntDec
+
+#define AuSimpleLockRwsemFuncs(prefix, param, rwsem) \
+static inline void prefix##_read_lock(param) \
+{ au_rw_read_lock(rwsem); } \
+static inline void prefix##_write_lock(param) \
+{ au_rw_write_lock(rwsem); } \
+static inline int prefix##_read_trylock(param) \
+{ return au_rw_read_trylock(rwsem); } \
+static inline int prefix##_write_trylock(param) \
+{ return au_rw_write_trylock(rwsem); }
+/* why is not _nested version defined */
+/* static inline void prefix##_read_trylock_nested(param, lsc)
+{ au_rw_read_trylock_nested(rwsem, lsc)); }
+static inline void prefix##_write_trylock_nestd(param, lsc)
+{ au_rw_write_trylock_nested(rwsem, lsc); } */
+
+#define AuSimpleUnlockRwsemFuncs(prefix, param, rwsem) \
+static inline void prefix##_read_unlock(param) \
+{ au_rw_read_unlock(rwsem); } \
+static inline void prefix##_write_unlock(param) \
+{ au_rw_write_unlock(rwsem); } \
+static inline void prefix##_downgrade_lock(param) \
+{ au_rw_dgrade_lock(rwsem); }
+
+#define AuSimpleRwsemFuncs(prefix, param, rwsem) \
+ AuSimpleLockRwsemFuncs(prefix, param, rwsem) \
+ AuSimpleUnlockRwsemFuncs(prefix, param, rwsem)
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_RWSEM_H__ */
diff -urN a/fs/aufs/sbinfo.c b/fs/aufs/sbinfo.c
--- a/fs/aufs/sbinfo.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/sbinfo.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,343 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * superblock private data
+ */
+
+#include "aufs.h"
+
+/*
+ * they are necessary regardless sysfs is disabled.
+ */
+void au_si_free(struct kobject *kobj)
+{
+ struct au_sbinfo *sbinfo;
+ char *locked __maybe_unused; /* debug only */
+
+ sbinfo = container_of(kobj, struct au_sbinfo, si_kobj);
+ AuDebugOn(!list_empty(&sbinfo->si_plink.head));
+ AuDebugOn(atomic_read(&sbinfo->si_nowait.nw_len));
+
+ au_rw_write_lock(&sbinfo->si_rwsem);
+ au_br_free(sbinfo);
+ au_rw_write_unlock(&sbinfo->si_rwsem);
+
+ AuDebugOn(radix_tree_gang_lookup
+ (&sbinfo->au_si_pid.tree, (void **)&locked,
+ /*first_index*/PID_MAX_DEFAULT - 1,
+ /*max_items*/sizeof(locked)/sizeof(*locked)));
+
+ kfree(sbinfo->si_branch);
+ kfree(sbinfo->au_si_pid.bitmap);
+ mutex_destroy(&sbinfo->si_xib_mtx);
+ AuRwDestroy(&sbinfo->si_rwsem);
+
+ kfree(sbinfo);
+}
+
+int au_si_alloc(struct super_block *sb)
+{
+ int err;
+ struct au_sbinfo *sbinfo;
+ static struct lock_class_key aufs_si;
+
+ err = -ENOMEM;
+ sbinfo = kzalloc(sizeof(*sbinfo), GFP_NOFS);
+ if (unlikely(!sbinfo))
+ goto out;
+
+ BUILD_BUG_ON(sizeof(unsigned long) !=
+ sizeof(*sbinfo->au_si_pid.bitmap));
+ sbinfo->au_si_pid.bitmap = kcalloc(BITS_TO_LONGS(PID_MAX_DEFAULT),
+ sizeof(*sbinfo->au_si_pid.bitmap),
+ GFP_NOFS);
+ if (unlikely(!sbinfo->au_si_pid.bitmap))
+ goto out_sbinfo;
+
+ /* will be reallocated separately */
+ sbinfo->si_branch = kzalloc(sizeof(*sbinfo->si_branch), GFP_NOFS);
+ if (unlikely(!sbinfo->si_branch))
+ goto out_pidmap;
+
+ err = sysaufs_si_init(sbinfo);
+ if (unlikely(err))
+ goto out_br;
+
+ au_nwt_init(&sbinfo->si_nowait);
+ au_rw_init_wlock(&sbinfo->si_rwsem);
+ au_rw_class(&sbinfo->si_rwsem, &aufs_si);
+ spin_lock_init(&sbinfo->au_si_pid.tree_lock);
+ INIT_RADIX_TREE(&sbinfo->au_si_pid.tree, GFP_ATOMIC | __GFP_NOFAIL);
+
+ atomic_long_set(&sbinfo->si_ninodes, 0);
+ atomic_long_set(&sbinfo->si_nfiles, 0);
+
+ sbinfo->si_bend = -1;
+
+ sbinfo->si_wbr_copyup = AuWbrCopyup_Def;
+ sbinfo->si_wbr_create = AuWbrCreate_Def;
+ sbinfo->si_wbr_copyup_ops = au_wbr_copyup_ops + sbinfo->si_wbr_copyup;
+ sbinfo->si_wbr_create_ops = au_wbr_create_ops + sbinfo->si_wbr_create;
+
+ sbinfo->si_mntflags = au_opts_plink(AuOpt_Def);
+
+ mutex_init(&sbinfo->si_xib_mtx);
+ sbinfo->si_xino_brid = -1;
+ /* leave si_xib_last_pindex and si_xib_next_bit */
+
+ sbinfo->si_rdcache = msecs_to_jiffies(AUFS_RDCACHE_DEF * MSEC_PER_SEC);
+ sbinfo->si_rdblk = AUFS_RDBLK_DEF;
+ sbinfo->si_rdhash = AUFS_RDHASH_DEF;
+ sbinfo->si_dirwh = AUFS_DIRWH_DEF;
+
+ au_spl_init(&sbinfo->si_plink);
+ init_waitqueue_head(&sbinfo->si_plink_wq);
+ spin_lock_init(&sbinfo->si_plink_maint_lock);
+
+ /* leave other members for sysaufs and si_mnt. */
+ sbinfo->si_sb = sb;
+ sb->s_fs_info = sbinfo;
+ si_pid_set(sb);
+ au_debug_sbinfo_init(sbinfo);
+ return 0; /* success */
+
+out_br:
+ kfree(sbinfo->si_branch);
+out_pidmap:
+ kfree(sbinfo->au_si_pid.bitmap);
+out_sbinfo:
+ kfree(sbinfo);
+out:
+ return err;
+}
+
+int au_sbr_realloc(struct au_sbinfo *sbinfo, int nbr)
+{
+ int err, sz;
+ struct au_branch **brp;
+
+ AuRwMustWriteLock(&sbinfo->si_rwsem);
+
+ err = -ENOMEM;
+ sz = sizeof(*brp) * (sbinfo->si_bend + 1);
+ if (unlikely(!sz))
+ sz = sizeof(*brp);
+ brp = au_kzrealloc(sbinfo->si_branch, sz, sizeof(*brp) * nbr, GFP_NOFS);
+ if (brp) {
+ sbinfo->si_branch = brp;
+ err = 0;
+ }
+
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+unsigned int au_sigen_inc(struct super_block *sb)
+{
+ unsigned int gen;
+
+ SiMustWriteLock(sb);
+
+ gen = ++au_sbi(sb)->si_generation;
+ au_update_digen(sb->s_root);
+ au_update_iigen(sb->s_root->d_inode);
+ sb->s_root->d_inode->i_version++;
+ return gen;
+}
+
+aufs_bindex_t au_new_br_id(struct super_block *sb)
+{
+ aufs_bindex_t br_id;
+ int i;
+ struct au_sbinfo *sbinfo;
+
+ SiMustWriteLock(sb);
+
+ sbinfo = au_sbi(sb);
+ for (i = 0; i <= AUFS_BRANCH_MAX; i++) {
+ br_id = ++sbinfo->si_last_br_id;
+ AuDebugOn(br_id < 0);
+ if (br_id && au_br_index(sb, br_id) < 0)
+ return br_id;
+ }
+
+ return -1;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* it is ok that new 'nwt' tasks are appended while we are sleeping */
+int si_read_lock(struct super_block *sb, int flags)
+{
+ int err;
+
+ err = 0;
+ if (au_ftest_lock(flags, FLUSH))
+ au_nwt_flush(&au_sbi(sb)->si_nowait);
+
+ si_noflush_read_lock(sb);
+ err = au_plink_maint(sb, flags);
+ if (unlikely(err))
+ si_read_unlock(sb);
+
+ return err;
+}
+
+int si_write_lock(struct super_block *sb, int flags)
+{
+ int err;
+
+ if (au_ftest_lock(flags, FLUSH))
+ au_nwt_flush(&au_sbi(sb)->si_nowait);
+
+ si_noflush_write_lock(sb);
+ err = au_plink_maint(sb, flags);
+ if (unlikely(err))
+ si_write_unlock(sb);
+
+ return err;
+}
+
+/* dentry and super_block lock. call at entry point */
+int aufs_read_lock(struct dentry *dentry, int flags)
+{
+ int err;
+ struct super_block *sb;
+
+ sb = dentry->d_sb;
+ err = si_read_lock(sb, flags);
+ if (unlikely(err))
+ goto out;
+
+ if (au_ftest_lock(flags, DW))
+ di_write_lock_child(dentry);
+ else
+ di_read_lock_child(dentry, flags);
+
+ if (au_ftest_lock(flags, GEN)) {
+ err = au_digen_test(dentry, au_sigen(sb));
+ AuDebugOn(!err && au_dbrange_test(dentry));
+ if (unlikely(err))
+ aufs_read_unlock(dentry, flags);
+ }
+
+out:
+ return err;
+}
+
+void aufs_read_unlock(struct dentry *dentry, int flags)
+{
+ if (au_ftest_lock(flags, DW))
+ di_write_unlock(dentry);
+ else
+ di_read_unlock(dentry, flags);
+ si_read_unlock(dentry->d_sb);
+}
+
+void aufs_write_lock(struct dentry *dentry)
+{
+ si_write_lock(dentry->d_sb, AuLock_FLUSH | AuLock_NOPLMW);
+ di_write_lock_child(dentry);
+}
+
+void aufs_write_unlock(struct dentry *dentry)
+{
+ di_write_unlock(dentry);
+ si_write_unlock(dentry->d_sb);
+}
+
+int aufs_read_and_write_lock2(struct dentry *d1, struct dentry *d2, int flags)
+{
+ int err;
+ unsigned int sigen;
+ struct super_block *sb;
+
+ sb = d1->d_sb;
+ err = si_read_lock(sb, flags);
+ if (unlikely(err))
+ goto out;
+
+ di_write_lock2_child(d1, d2, au_ftest_lock(flags, DIR));
+
+ if (au_ftest_lock(flags, GEN)) {
+ sigen = au_sigen(sb);
+ err = au_digen_test(d1, sigen);
+ AuDebugOn(!err && au_dbrange_test(d1));
+ if (!err) {
+ err = au_digen_test(d2, sigen);
+ AuDebugOn(!err && au_dbrange_test(d2));
+ }
+ if (unlikely(err))
+ aufs_read_and_write_unlock2(d1, d2);
+ }
+
+out:
+ return err;
+}
+
+void aufs_read_and_write_unlock2(struct dentry *d1, struct dentry *d2)
+{
+ di_write_unlock2(d1, d2);
+ si_read_unlock(d1->d_sb);
+}
+
+/* ---------------------------------------------------------------------- */
+
+int si_pid_test_slow(struct super_block *sb)
+{
+ void *p;
+
+ rcu_read_lock();
+ p = radix_tree_lookup(&au_sbi(sb)->au_si_pid.tree, current->pid);
+ rcu_read_unlock();
+
+ return (long)!!p;
+}
+
+void si_pid_set_slow(struct super_block *sb)
+{
+ int err;
+ struct au_sbinfo *sbinfo;
+
+ AuDebugOn(si_pid_test_slow(sb));
+
+ sbinfo = au_sbi(sb);
+ err = radix_tree_preload(GFP_NOFS | __GFP_NOFAIL);
+ AuDebugOn(err);
+ spin_lock(&sbinfo->au_si_pid.tree_lock);
+ err = radix_tree_insert(&sbinfo->au_si_pid.tree, current->pid,
+ /*any valid ptr*/sb);
+ spin_unlock(&sbinfo->au_si_pid.tree_lock);
+ AuDebugOn(err);
+ radix_tree_preload_end();
+}
+
+void si_pid_clr_slow(struct super_block *sb)
+{
+ void *p;
+ struct au_sbinfo *sbinfo;
+
+ AuDebugOn(!si_pid_test_slow(sb));
+
+ sbinfo = au_sbi(sb);
+ spin_lock(&sbinfo->au_si_pid.tree_lock);
+ p = radix_tree_delete(&sbinfo->au_si_pid.tree, current->pid);
+ spin_unlock(&sbinfo->au_si_pid.tree_lock);
+}
diff -urN a/fs/aufs/spl.h b/fs/aufs/spl.h
--- a/fs/aufs/spl.h 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/spl.h 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * simple list protected by a spinlock
+ */
+
+#ifndef __AUFS_SPL_H__
+#define __AUFS_SPL_H__
+
+#ifdef __KERNEL__
+
+struct au_splhead {
+ spinlock_t spin;
+ struct list_head head;
+};
+
+static inline void au_spl_init(struct au_splhead *spl)
+{
+ spin_lock_init(&spl->spin);
+ INIT_LIST_HEAD(&spl->head);
+}
+
+static inline void au_spl_add(struct list_head *list, struct au_splhead *spl)
+{
+ spin_lock(&spl->spin);
+ list_add(list, &spl->head);
+ spin_unlock(&spl->spin);
+}
+
+static inline void au_spl_del(struct list_head *list, struct au_splhead *spl)
+{
+ spin_lock(&spl->spin);
+ list_del(list);
+ spin_unlock(&spl->spin);
+}
+
+static inline void au_spl_del_rcu(struct list_head *list,
+ struct au_splhead *spl)
+{
+ spin_lock(&spl->spin);
+ list_del_rcu(list);
+ spin_unlock(&spl->spin);
+}
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_SPL_H__ */
diff -urN a/fs/aufs/super.c b/fs/aufs/super.c
--- a/fs/aufs/super.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/super.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,938 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * mount and super_block operations
+ */
+
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/seq_file.h>
+#include <linux/statfs.h>
+#include <linux/vmalloc.h>
+#include <linux/writeback.h>
+#include "aufs.h"
+
+/*
+ * super_operations
+ */
+static struct inode *aufs_alloc_inode(struct super_block *sb __maybe_unused)
+{
+ struct au_icntnr *c;
+
+ c = au_cache_alloc_icntnr();
+ if (c) {
+ au_icntnr_init(c);
+ c->vfs_inode.i_version = 1; /* sigen(sb); */
+ c->iinfo.ii_hinode = NULL;
+ return &c->vfs_inode;
+ }
+ return NULL;
+}
+
+static void aufs_destroy_inode_cb(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+
+ INIT_LIST_HEAD(&inode->i_dentry);
+ au_cache_free_icntnr(container_of(inode, struct au_icntnr, vfs_inode));
+}
+
+static void aufs_destroy_inode(struct inode *inode)
+{
+ au_iinfo_fin(inode);
+ call_rcu(&inode->i_rcu, aufs_destroy_inode_cb);
+}
+
+struct inode *au_iget_locked(struct super_block *sb, ino_t ino)
+{
+ struct inode *inode;
+ int err;
+
+ inode = iget_locked(sb, ino);
+ if (unlikely(!inode)) {
+ inode = ERR_PTR(-ENOMEM);
+ goto out;
+ }
+ if (!(inode->i_state & I_NEW))
+ goto out;
+
+ err = au_xigen_new(inode);
+ if (!err)
+ err = au_iinfo_init(inode);
+ if (!err)
+ inode->i_version++;
+ else {
+ iget_failed(inode);
+ inode = ERR_PTR(err);
+ }
+
+out:
+ /* never return NULL */
+ AuDebugOn(!inode);
+ AuTraceErrPtr(inode);
+ return inode;
+}
+
+/* lock free root dinfo */
+static int au_show_brs(struct seq_file *seq, struct super_block *sb)
+{
+ int err;
+ aufs_bindex_t bindex, bend;
+ struct path path;
+ struct au_hdentry *hdp;
+ struct au_branch *br;
+ char *perm;
+
+ err = 0;
+ bend = au_sbend(sb);
+ hdp = au_di(sb->s_root)->di_hdentry;
+ for (bindex = 0; !err && bindex <= bend; bindex++) {
+ br = au_sbr(sb, bindex);
+ path.mnt = br->br_mnt;
+ path.dentry = hdp[bindex].hd_dentry;
+ err = au_seq_path(seq, &path);
+ if (err > 0) {
+ perm = au_optstr_br_perm(br->br_perm);
+ if (perm) {
+ err = seq_printf(seq, "=%s", perm);
+ kfree(perm);
+ if (err == -1)
+ err = -E2BIG;
+ } else
+ err = -ENOMEM;
+ }
+ if (!err && bindex != bend)
+ err = seq_putc(seq, ':');
+ }
+
+ return err;
+}
+
+static void au_show_wbr_create(struct seq_file *m, int v,
+ struct au_sbinfo *sbinfo)
+{
+ const char *pat;
+
+ AuRwMustAnyLock(&sbinfo->si_rwsem);
+
+ seq_printf(m, ",create=");
+ pat = au_optstr_wbr_create(v);
+ switch (v) {
+ case AuWbrCreate_TDP:
+ case AuWbrCreate_RR:
+ case AuWbrCreate_MFS:
+ case AuWbrCreate_PMFS:
+ seq_printf(m, pat);
+ break;
+ case AuWbrCreate_MFSV:
+ seq_printf(m, /*pat*/"mfs:%lu",
+ jiffies_to_msecs(sbinfo->si_wbr_mfs.mfs_expire)
+ / MSEC_PER_SEC);
+ break;
+ case AuWbrCreate_PMFSV:
+ seq_printf(m, /*pat*/"pmfs:%lu",
+ jiffies_to_msecs(sbinfo->si_wbr_mfs.mfs_expire)
+ / MSEC_PER_SEC);
+ break;
+ case AuWbrCreate_MFSRR:
+ seq_printf(m, /*pat*/"mfsrr:%llu",
+ sbinfo->si_wbr_mfs.mfsrr_watermark);
+ break;
+ case AuWbrCreate_MFSRRV:
+ seq_printf(m, /*pat*/"mfsrr:%llu:%lu",
+ sbinfo->si_wbr_mfs.mfsrr_watermark,
+ jiffies_to_msecs(sbinfo->si_wbr_mfs.mfs_expire)
+ / MSEC_PER_SEC);
+ break;
+ }
+}
+
+static int au_show_xino(struct seq_file *seq, struct vfsmount *mnt)
+{
+#ifdef CONFIG_SYSFS
+ return 0;
+#else
+ int err;
+ const int len = sizeof(AUFS_XINO_FNAME) - 1;
+ aufs_bindex_t bindex, brid;
+ struct super_block *sb;
+ struct qstr *name;
+ struct file *f;
+ struct dentry *d, *h_root;
+ struct au_hdentry *hdp;
+
+ AuRwMustAnyLock(&sbinfo->si_rwsem);
+
+ err = 0;
+ sb = mnt->mnt_sb;
+ f = au_sbi(sb)->si_xib;
+ if (!f)
+ goto out;
+
+ /* stop printing the default xino path on the first writable branch */
+ h_root = NULL;
+ brid = au_xino_brid(sb);
+ if (brid >= 0) {
+ bindex = au_br_index(sb, brid);
+ hdp = au_di(sb->s_root)->di_hdentry;
+ h_root = hdp[0 + bindex].hd_dentry;
+ }
+ d = f->f_dentry;
+ name = &d->d_name;
+ /* safe ->d_parent because the file is unlinked */
+ if (d->d_parent == h_root
+ && name->len == len
+ && !memcmp(name->name, AUFS_XINO_FNAME, len))
+ goto out;
+
+ seq_puts(seq, ",xino=");
+ err = au_xino_path(seq, f);
+
+out:
+ return err;
+#endif
+}
+
+/* seq_file will re-call me in case of too long string */
+static int aufs_show_options(struct seq_file *m, struct vfsmount *mnt)
+{
+ int err;
+ unsigned int mnt_flags, v;
+ struct super_block *sb;
+ struct au_sbinfo *sbinfo;
+
+#define AuBool(name, str) do { \
+ v = au_opt_test(mnt_flags, name); \
+ if (v != au_opt_test(AuOpt_Def, name)) \
+ seq_printf(m, ",%s" #str, v ? "" : "no"); \
+} while (0)
+
+#define AuStr(name, str) do { \
+ v = mnt_flags & AuOptMask_##name; \
+ if (v != (AuOpt_Def & AuOptMask_##name)) \
+ seq_printf(m, "," #str "=%s", au_optstr_##str(v)); \
+} while (0)
+
+#define AuUInt(name, str, val) do { \
+ if (val != AUFS_##name##_DEF) \
+ seq_printf(m, "," #str "=%u", val); \
+} while (0)
+
+ /* lock free root dinfo */
+ sb = mnt->mnt_sb;
+ si_noflush_read_lock(sb);
+ sbinfo = au_sbi(sb);
+ seq_printf(m, ",si=%lx", sysaufs_si_id(sbinfo));
+
+ mnt_flags = au_mntflags(sb);
+ if (au_opt_test(mnt_flags, XINO)) {
+ err = au_show_xino(m, mnt);
+ if (unlikely(err))
+ goto out;
+ } else
+ seq_puts(m, ",noxino");
+
+ AuBool(TRUNC_XINO, trunc_xino);
+ AuStr(UDBA, udba);
+ AuBool(SHWH, shwh);
+ AuBool(PLINK, plink);
+ AuBool(DIO, dio);
+ /* AuBool(DIRPERM1, dirperm1); */
+ /* AuBool(REFROF, refrof); */
+
+ v = sbinfo->si_wbr_create;
+ if (v != AuWbrCreate_Def)
+ au_show_wbr_create(m, v, sbinfo);
+
+ v = sbinfo->si_wbr_copyup;
+ if (v != AuWbrCopyup_Def)
+ seq_printf(m, ",cpup=%s", au_optstr_wbr_copyup(v));
+
+ v = au_opt_test(mnt_flags, ALWAYS_DIROPQ);
+ if (v != au_opt_test(AuOpt_Def, ALWAYS_DIROPQ))
+ seq_printf(m, ",diropq=%c", v ? 'a' : 'w');
+
+ AuUInt(DIRWH, dirwh, sbinfo->si_dirwh);
+
+ v = jiffies_to_msecs(sbinfo->si_rdcache) / MSEC_PER_SEC;
+ AuUInt(RDCACHE, rdcache, v);
+
+ AuUInt(RDBLK, rdblk, sbinfo->si_rdblk);
+ AuUInt(RDHASH, rdhash, sbinfo->si_rdhash);
+
+ AuBool(SUM, sum);
+ /* AuBool(SUM_W, wsum); */
+ AuBool(WARN_PERM, warn_perm);
+ AuBool(VERBOSE, verbose);
+
+out:
+ /* be sure to print "br:" last */
+ if (!sysaufs_brs) {
+ seq_puts(m, ",br:");
+ au_show_brs(m, sb);
+ }
+ si_read_unlock(sb);
+ return 0;
+
+#undef AuBool
+#undef AuStr
+#undef AuUInt
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* sum mode which returns the summation for statfs(2) */
+
+static u64 au_add_till_max(u64 a, u64 b)
+{
+ u64 old;
+
+ old = a;
+ a += b;
+ if (old < a)
+ return a;
+ return ULLONG_MAX;
+}
+
+static int au_statfs_sum(struct super_block *sb, struct kstatfs *buf)
+{
+ int err;
+ u64 blocks, bfree, bavail, files, ffree;
+ aufs_bindex_t bend, bindex, i;
+ unsigned char shared;
+ struct path h_path;
+ struct super_block *h_sb;
+
+ blocks = 0;
+ bfree = 0;
+ bavail = 0;
+ files = 0;
+ ffree = 0;
+
+ err = 0;
+ bend = au_sbend(sb);
+ for (bindex = bend; bindex >= 0; bindex--) {
+ h_path.mnt = au_sbr_mnt(sb, bindex);
+ h_sb = h_path.mnt->mnt_sb;
+ shared = 0;
+ for (i = bindex + 1; !shared && i <= bend; i++)
+ shared = (au_sbr_sb(sb, i) == h_sb);
+ if (shared)
+ continue;
+
+ /* sb->s_root for NFS is unreliable */
+ h_path.dentry = h_path.mnt->mnt_root;
+ err = vfs_statfs(&h_path, buf);
+ if (unlikely(err))
+ goto out;
+
+ blocks = au_add_till_max(blocks, buf->f_blocks);
+ bfree = au_add_till_max(bfree, buf->f_bfree);
+ bavail = au_add_till_max(bavail, buf->f_bavail);
+ files = au_add_till_max(files, buf->f_files);
+ ffree = au_add_till_max(ffree, buf->f_ffree);
+ }
+
+ buf->f_blocks = blocks;
+ buf->f_bfree = bfree;
+ buf->f_bavail = bavail;
+ buf->f_files = files;
+ buf->f_ffree = ffree;
+
+out:
+ return err;
+}
+
+static int aufs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+ int err;
+ struct path h_path;
+ struct super_block *sb;
+
+ /* lock free root dinfo */
+ sb = dentry->d_sb;
+ si_noflush_read_lock(sb);
+ if (!au_opt_test(au_mntflags(sb), SUM)) {
+ /* sb->s_root for NFS is unreliable */
+ h_path.mnt = au_sbr_mnt(sb, 0);
+ h_path.dentry = h_path.mnt->mnt_root;
+ err = vfs_statfs(&h_path, buf);
+ } else
+ err = au_statfs_sum(sb, buf);
+ si_read_unlock(sb);
+
+ if (!err) {
+ buf->f_type = AUFS_SUPER_MAGIC;
+ buf->f_namelen = AUFS_MAX_NAMELEN;
+ memset(&buf->f_fsid, 0, sizeof(buf->f_fsid));
+ }
+ /* buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1; */
+
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* final actions when unmounting a file system */
+static void aufs_put_super(struct super_block *sb)
+{
+ struct au_sbinfo *sbinfo;
+
+ sbinfo = au_sbi(sb);
+ if (!sbinfo)
+ return;
+
+ dbgaufs_si_fin(sbinfo);
+ kobject_put(&sbinfo->si_kobj);
+}
+
+/* ---------------------------------------------------------------------- */
+
+void au_array_free(void *array)
+{
+ if (array) {
+ if (!is_vmalloc_addr(array))
+ kfree(array);
+ else
+ vfree(array);
+ }
+}
+
+void *au_array_alloc(unsigned long long *hint, au_arraycb_t cb, void *arg)
+{
+ void *array;
+ unsigned long long n;
+
+ array = NULL;
+ n = 0;
+ if (!*hint)
+ goto out;
+
+ if (*hint > ULLONG_MAX / sizeof(array)) {
+ array = ERR_PTR(-EMFILE);
+ pr_err("hint %llu\n", *hint);
+ goto out;
+ }
+
+ array = kmalloc(sizeof(array) * *hint, GFP_NOFS);
+ if (unlikely(!array))
+ array = vmalloc(sizeof(array) * *hint);
+ if (unlikely(!array)) {
+ array = ERR_PTR(-ENOMEM);
+ goto out;
+ }
+
+ n = cb(array, *hint, arg);
+ AuDebugOn(n > *hint);
+
+out:
+ *hint = n;
+ return array;
+}
+
+static unsigned long long au_iarray_cb(void *a,
+ unsigned long long max __maybe_unused,
+ void *arg)
+{
+ unsigned long long n;
+ struct inode **p, *inode;
+ struct list_head *head;
+
+ n = 0;
+ p = a;
+ head = arg;
+ spin_lock(&inode_sb_list_lock);
+ list_for_each_entry(inode, head, i_sb_list) {
+ if (!is_bad_inode(inode)
+ && au_ii(inode)->ii_bstart >= 0) {
+ spin_lock(&inode->i_lock);
+ if (atomic_read(&inode->i_count)) {
+ au_igrab(inode);
+ *p++ = inode;
+ n++;
+ AuDebugOn(n > max);
+ }
+ spin_unlock(&inode->i_lock);
+ }
+ }
+ spin_unlock(&inode_sb_list_lock);
+
+ return n;
+}
+
+struct inode **au_iarray_alloc(struct super_block *sb, unsigned long long *max)
+{
+ *max = atomic_long_read(&au_sbi(sb)->si_ninodes);
+ return au_array_alloc(max, au_iarray_cb, &sb->s_inodes);
+}
+
+void au_iarray_free(struct inode **a, unsigned long long max)
+{
+ unsigned long long ull;
+
+ for (ull = 0; ull < max; ull++)
+ iput(a[ull]);
+ au_array_free(a);
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * refresh dentry and inode at remount time.
+ */
+/* todo: consolidate with simple_reval_dpath() and au_reval_for_attr() */
+static int au_do_refresh(struct dentry *dentry, unsigned int dir_flags,
+ struct dentry *parent)
+{
+ int err;
+
+ di_write_lock_child(dentry);
+ di_read_lock_parent(parent, AuLock_IR);
+ err = au_refresh_dentry(dentry, parent);
+ if (!err && dir_flags)
+ au_hn_reset(dentry->d_inode, dir_flags);
+ di_read_unlock(parent, AuLock_IR);
+ di_write_unlock(dentry);
+
+ return err;
+}
+
+static int au_do_refresh_d(struct dentry *dentry, unsigned int sigen,
+ struct au_sbinfo *sbinfo,
+ const unsigned int dir_flags)
+{
+ int err;
+ struct dentry *parent;
+ struct inode *inode;
+
+ err = 0;
+ parent = dget_parent(dentry);
+ if (!au_digen_test(parent, sigen) && au_digen_test(dentry, sigen)) {
+ inode = dentry->d_inode;
+ if (inode) {
+ if (!S_ISDIR(inode->i_mode))
+ err = au_do_refresh(dentry, /*dir_flags*/0,
+ parent);
+ else {
+ err = au_do_refresh(dentry, dir_flags, parent);
+ if (unlikely(err))
+ au_fset_si(sbinfo, FAILED_REFRESH_DIR);
+ }
+ } else
+ err = au_do_refresh(dentry, /*dir_flags*/0, parent);
+ AuDbgDentry(dentry);
+ }
+ dput(parent);
+
+ AuTraceErr(err);
+ return err;
+}
+
+static int au_refresh_d(struct super_block *sb)
+{
+ int err, i, j, ndentry, e;
+ unsigned int sigen;
+ struct au_dcsub_pages dpages;
+ struct au_dpage *dpage;
+ struct dentry **dentries, *d;
+ struct au_sbinfo *sbinfo;
+ struct dentry *root = sb->s_root;
+ const unsigned int dir_flags = au_hi_flags(root->d_inode, /*isdir*/1);
+
+ err = au_dpages_init(&dpages, GFP_NOFS);
+ if (unlikely(err))
+ goto out;
+ err = au_dcsub_pages(&dpages, root, NULL, NULL);
+ if (unlikely(err))
+ goto out_dpages;
+
+ sigen = au_sigen(sb);
+ sbinfo = au_sbi(sb);
+ for (i = 0; i < dpages.ndpage; i++) {
+ dpage = dpages.dpages + i;
+ dentries = dpage->dentries;
+ ndentry = dpage->ndentry;
+ for (j = 0; j < ndentry; j++) {
+ d = dentries[j];
+ e = au_do_refresh_d(d, sigen, sbinfo, dir_flags);
+ if (unlikely(e && !err))
+ err = e;
+ /* go on even err */
+ }
+ }
+
+out_dpages:
+ au_dpages_free(&dpages);
+out:
+ return err;
+}
+
+static int au_refresh_i(struct super_block *sb)
+{
+ int err, e;
+ unsigned int sigen;
+ unsigned long long max, ull;
+ struct inode *inode, **array;
+
+ array = au_iarray_alloc(sb, &max);
+ err = PTR_ERR(array);
+ if (IS_ERR(array))
+ goto out;
+
+ err = 0;
+ sigen = au_sigen(sb);
+ for (ull = 0; ull < max; ull++) {
+ inode = array[ull];
+ if (au_iigen(inode) != sigen) {
+ ii_write_lock_child(inode);
+ e = au_refresh_hinode_self(inode);
+ ii_write_unlock(inode);
+ if (unlikely(e)) {
+ pr_err("error %d, i%lu\n", e, inode->i_ino);
+ if (!err)
+ err = e;
+ /* go on even if err */
+ }
+ }
+ }
+
+ au_iarray_free(array, max);
+
+out:
+ return err;
+}
+
+static void au_remount_refresh(struct super_block *sb)
+{
+ int err, e;
+ unsigned int udba;
+ aufs_bindex_t bindex, bend;
+ struct dentry *root;
+ struct inode *inode;
+ struct au_branch *br;
+
+ au_sigen_inc(sb);
+ au_fclr_si(au_sbi(sb), FAILED_REFRESH_DIR);
+
+ root = sb->s_root;
+ DiMustNoWaiters(root);
+ inode = root->d_inode;
+ IiMustNoWaiters(inode);
+
+ udba = au_opt_udba(sb);
+ bend = au_sbend(sb);
+ for (bindex = 0; bindex <= bend; bindex++) {
+ br = au_sbr(sb, bindex);
+ err = au_hnotify_reset_br(udba, br, br->br_perm);
+ if (unlikely(err))
+ AuIOErr("hnotify failed on br %d, %d, ignored\n",
+ bindex, err);
+ /* go on even if err */
+ }
+ au_hn_reset(inode, au_hi_flags(inode, /*isdir*/1));
+
+ di_write_unlock(root);
+ err = au_refresh_d(sb);
+ e = au_refresh_i(sb);
+ if (unlikely(e && !err))
+ err = e;
+ /* aufs_write_lock() calls ..._child() */
+ di_write_lock_child(root);
+
+ au_cpup_attr_all(inode, /*force*/1);
+
+ if (unlikely(err))
+ AuIOErr("refresh failed, ignored, %d\n", err);
+}
+
+/* stop extra interpretation of errno in mount(8), and strange error messages */
+static int cvt_err(int err)
+{
+ AuTraceErr(err);
+
+ switch (err) {
+ case -ENOENT:
+ case -ENOTDIR:
+ case -EEXIST:
+ case -EIO:
+ err = -EINVAL;
+ }
+ return err;
+}
+
+static int aufs_remount_fs(struct super_block *sb, int *flags, char *data)
+{
+ int err, do_dx;
+ unsigned int mntflags;
+ struct au_opts opts;
+ struct dentry *root;
+ struct inode *inode;
+ struct au_sbinfo *sbinfo;
+
+ err = 0;
+ root = sb->s_root;
+ if (!data || !*data) {
+ err = si_write_lock(sb, AuLock_FLUSH | AuLock_NOPLM);
+ if (!err) {
+ di_write_lock_child(root);
+ err = au_opts_verify(sb, *flags, /*pending*/0);
+ aufs_write_unlock(root);
+ }
+ goto out;
+ }
+
+ err = -ENOMEM;
+ memset(&opts, 0, sizeof(opts));
+ opts.opt = (void *)__get_free_page(GFP_NOFS);
+ if (unlikely(!opts.opt))
+ goto out;
+ opts.max_opt = PAGE_SIZE / sizeof(*opts.opt);
+ opts.flags = AuOpts_REMOUNT;
+ opts.sb_flags = *flags;
+
+ /* parse it before aufs lock */
+ err = au_opts_parse(sb, data, &opts);
+ if (unlikely(err))
+ goto out_opts;
+
+ sbinfo = au_sbi(sb);
+ inode = root->d_inode;
+ mutex_lock(&inode->i_mutex);
+ err = si_write_lock(sb, AuLock_FLUSH | AuLock_NOPLM);
+ if (unlikely(err))
+ goto out_mtx;
+ di_write_lock_child(root);
+
+ /* au_opts_remount() may return an error */
+ err = au_opts_remount(sb, &opts);
+ au_opts_free(&opts);
+
+ if (au_ftest_opts(opts.flags, REFRESH))
+ au_remount_refresh(sb);
+
+ if (au_ftest_opts(opts.flags, REFRESH_DYAOP)) {
+ mntflags = au_mntflags(sb);
+ do_dx = !!au_opt_test(mntflags, DIO);
+ au_dy_arefresh(do_dx);
+ }
+
+ aufs_write_unlock(root);
+
+out_mtx:
+ mutex_unlock(&inode->i_mutex);
+out_opts:
+ free_page((unsigned long)opts.opt);
+out:
+ err = cvt_err(err);
+ AuTraceErr(err);
+ return err;
+}
+
+static const struct super_operations aufs_sop = {
+ .alloc_inode = aufs_alloc_inode,
+ .destroy_inode = aufs_destroy_inode,
+ /* always deleting, no clearing */
+ .drop_inode = generic_delete_inode,
+ .show_options = aufs_show_options,
+ .statfs = aufs_statfs,
+ .put_super = aufs_put_super,
+ .remount_fs = aufs_remount_fs
+};
+
+/* ---------------------------------------------------------------------- */
+
+static int alloc_root(struct super_block *sb)
+{
+ int err;
+ struct inode *inode;
+ struct dentry *root;
+
+ err = -ENOMEM;
+ inode = au_iget_locked(sb, AUFS_ROOT_INO);
+ err = PTR_ERR(inode);
+ if (IS_ERR(inode))
+ goto out;
+
+ inode->i_op = &aufs_dir_iop;
+ inode->i_fop = &aufs_dir_fop;
+ inode->i_mode = S_IFDIR;
+ set_nlink(inode, 2);
+ unlock_new_inode(inode);
+
+ root = d_alloc_root(inode);
+ if (unlikely(!root))
+ goto out_iput;
+ err = PTR_ERR(root);
+ if (IS_ERR(root))
+ goto out_iput;
+
+ err = au_di_init(root);
+ if (!err) {
+ sb->s_root = root;
+ return 0; /* success */
+ }
+ dput(root);
+ goto out; /* do not iput */
+
+out_iput:
+ iget_failed(inode);
+out:
+ return err;
+
+}
+
+static int aufs_fill_super(struct super_block *sb, void *raw_data,
+ int silent __maybe_unused)
+{
+ int err;
+ struct au_opts opts;
+ struct dentry *root;
+ struct inode *inode;
+ char *arg = raw_data;
+
+ if (unlikely(!arg || !*arg)) {
+ err = -EINVAL;
+ pr_err("no arg\n");
+ goto out;
+ }
+
+ err = -ENOMEM;
+ memset(&opts, 0, sizeof(opts));
+ opts.opt = (void *)__get_free_page(GFP_NOFS);
+ if (unlikely(!opts.opt))
+ goto out;
+ opts.max_opt = PAGE_SIZE / sizeof(*opts.opt);
+ opts.sb_flags = sb->s_flags;
+
+ err = au_si_alloc(sb);
+ if (unlikely(err))
+ goto out_opts;
+
+ /* all timestamps always follow the ones on the branch */
+ sb->s_flags |= MS_NOATIME | MS_NODIRATIME;
+ sb->s_op = &aufs_sop;
+ sb->s_d_op = &aufs_dop;
+ sb->s_magic = AUFS_SUPER_MAGIC;
+ sb->s_maxbytes = 0;
+ au_export_init(sb);
+
+ err = alloc_root(sb);
+ if (unlikely(err)) {
+ si_write_unlock(sb);
+ goto out_info;
+ }
+ root = sb->s_root;
+ inode = root->d_inode;
+
+ /*
+ * actually we can parse options regardless aufs lock here.
+ * but at remount time, parsing must be done before aufs lock.
+ * so we follow the same rule.
+ */
+ ii_write_lock_parent(inode);
+ aufs_write_unlock(root);
+ err = au_opts_parse(sb, arg, &opts);
+ if (unlikely(err))
+ goto out_root;
+
+ /* lock vfs_inode first, then aufs. */
+ mutex_lock(&inode->i_mutex);
+ aufs_write_lock(root);
+ err = au_opts_mount(sb, &opts);
+ au_opts_free(&opts);
+ aufs_write_unlock(root);
+ mutex_unlock(&inode->i_mutex);
+ if (!err)
+ goto out_opts; /* success */
+
+out_root:
+ dput(root);
+ sb->s_root = NULL;
+out_info:
+ dbgaufs_si_fin(au_sbi(sb));
+ kobject_put(&au_sbi(sb)->si_kobj);
+ sb->s_fs_info = NULL;
+out_opts:
+ free_page((unsigned long)opts.opt);
+out:
+ AuTraceErr(err);
+ err = cvt_err(err);
+ AuTraceErr(err);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static struct dentry *aufs_mount(struct file_system_type *fs_type, int flags,
+ const char *dev_name __maybe_unused,
+ void *raw_data)
+{
+ struct dentry *root;
+ struct super_block *sb;
+
+ /* all timestamps always follow the ones on the branch */
+ /* mnt->mnt_flags |= MNT_NOATIME | MNT_NODIRATIME; */
+ root = mount_nodev(fs_type, flags, raw_data, aufs_fill_super);
+ if (IS_ERR(root))
+ goto out;
+
+ sb = root->d_sb;
+ si_write_lock(sb, !AuLock_FLUSH);
+ sysaufs_brs_add(sb, 0);
+ si_write_unlock(sb);
+ au_sbilist_add(sb);
+
+out:
+ return root;
+}
+
+static void aufs_kill_sb(struct super_block *sb)
+{
+ struct au_sbinfo *sbinfo;
+
+ sbinfo = au_sbi(sb);
+ if (sbinfo) {
+ au_sbilist_del(sb);
+ aufs_write_lock(sb->s_root);
+ if (sbinfo->si_wbr_create_ops->fin)
+ sbinfo->si_wbr_create_ops->fin(sb);
+ if (au_opt_test(sbinfo->si_mntflags, UDBA_HNOTIFY)) {
+ au_opt_set_udba(sbinfo->si_mntflags, UDBA_NONE);
+ au_remount_refresh(sb);
+ }
+ if (au_opt_test(sbinfo->si_mntflags, PLINK))
+ au_plink_put(sb, /*verbose*/1);
+ au_xino_clr(sb);
+ sbinfo->si_sb = NULL;
+ aufs_write_unlock(sb->s_root);
+ au_nwt_flush(&sbinfo->si_nowait);
+ }
+ generic_shutdown_super(sb);
+}
+
+struct file_system_type aufs_fs_type = {
+ .name = AUFS_FSTYPE,
+ .fs_flags =
+ FS_RENAME_DOES_D_MOVE /* a race between rename and others */
+ | FS_REVAL_DOT, /* for NFS branch and udba */
+ .mount = aufs_mount,
+ .kill_sb = aufs_kill_sb,
+ /* no need to __module_get() and module_put(). */
+ .owner = THIS_MODULE,
+};
diff -urN a/fs/aufs/super.h b/fs/aufs/super.h
--- a/fs/aufs/super.h 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/super.h 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,546 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * super_block operations
+ */
+
+#ifndef __AUFS_SUPER_H__
+#define __AUFS_SUPER_H__
+
+#ifdef __KERNEL__
+
+#include <linux/fs.h>
+#include "rwsem.h"
+#include "spl.h"
+#include "wkq.h"
+
+typedef ssize_t (*au_readf_t)(struct file *, char __user *, size_t, loff_t *);
+typedef ssize_t (*au_writef_t)(struct file *, const char __user *, size_t,
+ loff_t *);
+
+/* policies to select one among multiple writable branches */
+struct au_wbr_copyup_operations {
+ int (*copyup)(struct dentry *dentry);
+};
+
+struct au_wbr_create_operations {
+ int (*create)(struct dentry *dentry, int isdir);
+ int (*init)(struct super_block *sb);
+ int (*fin)(struct super_block *sb);
+};
+
+struct au_wbr_mfs {
+ struct mutex mfs_lock; /* protect this structure */
+ unsigned long mfs_jiffy;
+ unsigned long mfs_expire;
+ aufs_bindex_t mfs_bindex;
+
+ unsigned long long mfsrr_bytes;
+ unsigned long long mfsrr_watermark;
+};
+
+struct au_branch;
+struct au_sbinfo {
+ /* nowait tasks in the system-wide workqueue */
+ struct au_nowait_tasks si_nowait;
+
+ /*
+ * tried sb->s_umount, but failed due to the dependecy between i_mutex.
+ * rwsem for au_sbinfo is necessary.
+ */
+ struct au_rwsem si_rwsem;
+
+ /* prevent recursive locking in deleting inode */
+ struct {
+ unsigned long *bitmap;
+ spinlock_t tree_lock;
+ struct radix_tree_root tree;
+ } au_si_pid;
+
+ /*
+ * dirty approach to protect sb->sb_inodes and ->s_files from remount.
+ */
+ atomic_long_t si_ninodes, si_nfiles;
+
+ /* branch management */
+ unsigned int si_generation;
+
+ /* see above flags */
+ unsigned char au_si_status;
+
+ aufs_bindex_t si_bend;
+
+ /* dirty trick to keep br_id plus */
+ unsigned int si_last_br_id :
+ sizeof(aufs_bindex_t) * BITS_PER_BYTE - 1;
+ struct au_branch **si_branch;
+
+ /* policy to select a writable branch */
+ unsigned char si_wbr_copyup;
+ unsigned char si_wbr_create;
+ struct au_wbr_copyup_operations *si_wbr_copyup_ops;
+ struct au_wbr_create_operations *si_wbr_create_ops;
+
+ /* round robin */
+ atomic_t si_wbr_rr_next;
+
+ /* most free space */
+ struct au_wbr_mfs si_wbr_mfs;
+
+ /* mount flags */
+ /* include/asm-ia64/siginfo.h defines a macro named si_flags */
+ unsigned int si_mntflags;
+
+ /* external inode number (bitmap and translation table) */
+ au_readf_t si_xread;
+ au_writef_t si_xwrite;
+ struct file *si_xib;
+ struct mutex si_xib_mtx; /* protect xib members */
+ unsigned long *si_xib_buf;
+ unsigned long si_xib_last_pindex;
+ int si_xib_next_bit;
+ aufs_bindex_t si_xino_brid;
+ /* reserved for future use */
+ /* unsigned long long si_xib_limit; */ /* Max xib file size */
+
+#ifdef CONFIG_AUFS_EXPORT
+ /* i_generation */
+ struct file *si_xigen;
+ atomic_t si_xigen_next;
+#endif
+
+ /* vdir parameters */
+ unsigned long si_rdcache; /* max cache time in jiffies */
+ unsigned int si_rdblk; /* deblk size */
+ unsigned int si_rdhash; /* hash size */
+
+ /*
+ * If the number of whiteouts are larger than si_dirwh, leave all of
+ * them after au_whtmp_ren to reduce the cost of rmdir(2).
+ * future fsck.aufs or kernel thread will remove them later.
+ * Otherwise, remove all whiteouts and the dir in rmdir(2).
+ */
+ unsigned int si_dirwh;
+
+ /*
+ * rename(2) a directory with all children.
+ */
+ /* reserved for future use */
+ /* int si_rendir; */
+
+ /* pseudo_link list */
+ struct au_splhead si_plink;
+ wait_queue_head_t si_plink_wq;
+ spinlock_t si_plink_maint_lock;
+ pid_t si_plink_maint_pid;
+
+ /*
+ * sysfs and lifetime management.
+ * this is not a small structure and it may be a waste of memory in case
+ * of sysfs is disabled, particulary when many aufs-es are mounted.
+ * but using sysfs is majority.
+ */
+ struct kobject si_kobj;
+#ifdef CONFIG_DEBUG_FS
+ struct dentry *si_dbgaufs, *si_dbgaufs_xib;
+#ifdef CONFIG_AUFS_EXPORT
+ struct dentry *si_dbgaufs_xigen;
+#endif
+#endif
+
+#ifdef CONFIG_AUFS_SBILIST
+ struct list_head si_list;
+#endif
+
+ /* dirty, necessary for unmounting, sysfs and sysrq */
+ struct super_block *si_sb;
+};
+
+/* sbinfo status flags */
+/*
+ * set true when refresh_dirs() failed at remount time.
+ * then try refreshing dirs at access time again.
+ * if it is false, refreshing dirs at access time is unnecesary
+ */
+#define AuSi_FAILED_REFRESH_DIR 1
+static inline unsigned char au_do_ftest_si(struct au_sbinfo *sbi,
+ unsigned int flag)
+{
+ AuRwMustAnyLock(&sbi->si_rwsem);
+ return sbi->au_si_status & flag;
+}
+#define au_ftest_si(sbinfo, name) au_do_ftest_si(sbinfo, AuSi_##name)
+#define au_fset_si(sbinfo, name) do { \
+ AuRwMustWriteLock(&(sbinfo)->si_rwsem); \
+ (sbinfo)->au_si_status |= AuSi_##name; \
+} while (0)
+#define au_fclr_si(sbinfo, name) do { \
+ AuRwMustWriteLock(&(sbinfo)->si_rwsem); \
+ (sbinfo)->au_si_status &= ~AuSi_##name; \
+} while (0)
+
+/* ---------------------------------------------------------------------- */
+
+/* policy to select one among writable branches */
+#define AuWbrCopyup(sbinfo, ...) \
+ ((sbinfo)->si_wbr_copyup_ops->copyup(__VA_ARGS__))
+#define AuWbrCreate(sbinfo, ...) \
+ ((sbinfo)->si_wbr_create_ops->create(__VA_ARGS__))
+
+/* flags for si_read_lock()/aufs_read_lock()/di_read_lock() */
+#define AuLock_DW 1 /* write-lock dentry */
+#define AuLock_IR (1 << 1) /* read-lock inode */
+#define AuLock_IW (1 << 2) /* write-lock inode */
+#define AuLock_FLUSH (1 << 3) /* wait for 'nowait' tasks */
+#define AuLock_DIR (1 << 4) /* target is a dir */
+#define AuLock_NOPLM (1 << 5) /* return err in plm mode */
+#define AuLock_NOPLMW (1 << 6) /* wait for plm mode ends */
+#define AuLock_GEN (1 << 7) /* test digen/iigen */
+#define au_ftest_lock(flags, name) ((flags) & AuLock_##name)
+#define au_fset_lock(flags, name) \
+ do { (flags) |= AuLock_##name; } while (0)
+#define au_fclr_lock(flags, name) \
+ do { (flags) &= ~AuLock_##name; } while (0)
+
+/* ---------------------------------------------------------------------- */
+
+/* super.c */
+extern struct file_system_type aufs_fs_type;
+struct inode *au_iget_locked(struct super_block *sb, ino_t ino);
+typedef unsigned long long (*au_arraycb_t)(void *array, unsigned long long max,
+ void *arg);
+void au_array_free(void *array);
+void *au_array_alloc(unsigned long long *hint, au_arraycb_t cb, void *arg);
+struct inode **au_iarray_alloc(struct super_block *sb, unsigned long long *max);
+void au_iarray_free(struct inode **a, unsigned long long max);
+
+/* sbinfo.c */
+void au_si_free(struct kobject *kobj);
+int au_si_alloc(struct super_block *sb);
+int au_sbr_realloc(struct au_sbinfo *sbinfo, int nbr);
+
+unsigned int au_sigen_inc(struct super_block *sb);
+aufs_bindex_t au_new_br_id(struct super_block *sb);
+
+int si_read_lock(struct super_block *sb, int flags);
+int si_write_lock(struct super_block *sb, int flags);
+int aufs_read_lock(struct dentry *dentry, int flags);
+void aufs_read_unlock(struct dentry *dentry, int flags);
+void aufs_write_lock(struct dentry *dentry);
+void aufs_write_unlock(struct dentry *dentry);
+int aufs_read_and_write_lock2(struct dentry *d1, struct dentry *d2, int flags);
+void aufs_read_and_write_unlock2(struct dentry *d1, struct dentry *d2);
+
+int si_pid_test_slow(struct super_block *sb);
+void si_pid_set_slow(struct super_block *sb);
+void si_pid_clr_slow(struct super_block *sb);
+
+/* wbr_policy.c */
+extern struct au_wbr_copyup_operations au_wbr_copyup_ops[];
+extern struct au_wbr_create_operations au_wbr_create_ops[];
+int au_cpdown_dirs(struct dentry *dentry, aufs_bindex_t bdst);
+
+/* ---------------------------------------------------------------------- */
+
+static inline struct au_sbinfo *au_sbi(struct super_block *sb)
+{
+ return sb->s_fs_info;
+}
+
+/* ---------------------------------------------------------------------- */
+
+#ifdef CONFIG_AUFS_EXPORT
+void au_export_init(struct super_block *sb);
+
+static inline int au_test_nfsd(void)
+{
+ struct task_struct *tsk = current;
+
+ return (tsk->flags & PF_KTHREAD)
+ && !strcmp(tsk->comm, "nfsd");
+}
+
+void au_xigen_inc(struct inode *inode);
+int au_xigen_new(struct inode *inode);
+int au_xigen_set(struct super_block *sb, struct file *base);
+void au_xigen_clr(struct super_block *sb);
+
+static inline int au_busy_or_stale(void)
+{
+ if (!au_test_nfsd())
+ return -EBUSY;
+ return -ESTALE;
+}
+#else
+AuStubVoid(au_export_init, struct super_block *sb)
+AuStubInt0(au_test_nfsd, void)
+AuStubVoid(au_xigen_inc, struct inode *inode)
+AuStubInt0(au_xigen_new, struct inode *inode)
+AuStubInt0(au_xigen_set, struct super_block *sb, struct file *base)
+AuStubVoid(au_xigen_clr, struct super_block *sb)
+static inline int au_busy_or_stale(void)
+{
+ return -EBUSY;
+}
+#endif /* CONFIG_AUFS_EXPORT */
+
+/* ---------------------------------------------------------------------- */
+
+#ifdef CONFIG_AUFS_SBILIST
+/* module.c */
+extern struct au_splhead au_sbilist;
+
+static inline void au_sbilist_init(void)
+{
+ au_spl_init(&au_sbilist);
+}
+
+static inline void au_sbilist_add(struct super_block *sb)
+{
+ au_spl_add(&au_sbi(sb)->si_list, &au_sbilist);
+}
+
+static inline void au_sbilist_del(struct super_block *sb)
+{
+ au_spl_del(&au_sbi(sb)->si_list, &au_sbilist);
+}
+
+#ifdef CONFIG_AUFS_MAGIC_SYSRQ
+static inline void au_sbilist_lock(void)
+{
+ spin_lock(&au_sbilist.spin);
+}
+
+static inline void au_sbilist_unlock(void)
+{
+ spin_unlock(&au_sbilist.spin);
+}
+#define AuGFP_SBILIST GFP_ATOMIC
+#else
+AuStubVoid(au_sbilist_lock, void)
+AuStubVoid(au_sbilist_unlock, void)
+#define AuGFP_SBILIST GFP_NOFS
+#endif /* CONFIG_AUFS_MAGIC_SYSRQ */
+#else
+AuStubVoid(au_sbilist_init, void)
+AuStubVoid(au_sbilist_add, struct super_block*)
+AuStubVoid(au_sbilist_del, struct super_block*)
+AuStubVoid(au_sbilist_lock, void)
+AuStubVoid(au_sbilist_unlock, void)
+#define AuGFP_SBILIST GFP_NOFS
+#endif
+
+/* ---------------------------------------------------------------------- */
+
+static inline void dbgaufs_si_null(struct au_sbinfo *sbinfo)
+{
+ /*
+ * This function is a dynamic '__init' fucntion actually,
+ * so the tiny check for si_rwsem is unnecessary.
+ */
+ /* AuRwMustWriteLock(&sbinfo->si_rwsem); */
+#ifdef CONFIG_DEBUG_FS
+ sbinfo->si_dbgaufs = NULL;
+ sbinfo->si_dbgaufs_xib = NULL;
+#ifdef CONFIG_AUFS_EXPORT
+ sbinfo->si_dbgaufs_xigen = NULL;
+#endif
+#endif
+}
+
+/* ---------------------------------------------------------------------- */
+
+static inline pid_t si_pid_bit(void)
+{
+ /* the origin of pid is 1, but the bitmap's is 0 */
+ return current->pid - 1;
+}
+
+static inline int si_pid_test(struct super_block *sb)
+{
+ pid_t bit = si_pid_bit();
+ if (bit < PID_MAX_DEFAULT)
+ return test_bit(bit, au_sbi(sb)->au_si_pid.bitmap);
+ else
+ return si_pid_test_slow(sb);
+}
+
+static inline void si_pid_set(struct super_block *sb)
+{
+ pid_t bit = si_pid_bit();
+ if (bit < PID_MAX_DEFAULT) {
+ AuDebugOn(test_bit(bit, au_sbi(sb)->au_si_pid.bitmap));
+ set_bit(bit, au_sbi(sb)->au_si_pid.bitmap);
+ /* smp_mb(); */
+ } else
+ si_pid_set_slow(sb);
+}
+
+static inline void si_pid_clr(struct super_block *sb)
+{
+ pid_t bit = si_pid_bit();
+ if (bit < PID_MAX_DEFAULT) {
+ AuDebugOn(!test_bit(bit, au_sbi(sb)->au_si_pid.bitmap));
+ clear_bit(bit, au_sbi(sb)->au_si_pid.bitmap);
+ /* smp_mb(); */
+ } else
+ si_pid_clr_slow(sb);
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* lock superblock. mainly for entry point functions */
+/*
+ * __si_read_lock, __si_write_lock,
+ * __si_read_unlock, __si_write_unlock, __si_downgrade_lock
+ */
+AuSimpleRwsemFuncs(__si, struct super_block *sb, &au_sbi(sb)->si_rwsem);
+
+#define SiMustNoWaiters(sb) AuRwMustNoWaiters(&au_sbi(sb)->si_rwsem)
+#define SiMustAnyLock(sb) AuRwMustAnyLock(&au_sbi(sb)->si_rwsem)
+#define SiMustWriteLock(sb) AuRwMustWriteLock(&au_sbi(sb)->si_rwsem)
+
+static inline void si_noflush_read_lock(struct super_block *sb)
+{
+ __si_read_lock(sb);
+ si_pid_set(sb);
+}
+
+static inline int si_noflush_read_trylock(struct super_block *sb)
+{
+ int locked = __si_read_trylock(sb);
+ if (locked)
+ si_pid_set(sb);
+ return locked;
+}
+
+static inline void si_noflush_write_lock(struct super_block *sb)
+{
+ __si_write_lock(sb);
+ si_pid_set(sb);
+}
+
+static inline int si_noflush_write_trylock(struct super_block *sb)
+{
+ int locked = __si_write_trylock(sb);
+ if (locked)
+ si_pid_set(sb);
+ return locked;
+}
+
+#if 0 /* unused */
+static inline int si_read_trylock(struct super_block *sb, int flags)
+{
+ if (au_ftest_lock(flags, FLUSH))
+ au_nwt_flush(&au_sbi(sb)->si_nowait);
+ return si_noflush_read_trylock(sb);
+}
+#endif
+
+static inline void si_read_unlock(struct super_block *sb)
+{
+ si_pid_clr(sb);
+ __si_read_unlock(sb);
+}
+
+#if 0 /* unused */
+static inline int si_write_trylock(struct super_block *sb, int flags)
+{
+ if (au_ftest_lock(flags, FLUSH))
+ au_nwt_flush(&au_sbi(sb)->si_nowait);
+ return si_noflush_write_trylock(sb);
+}
+#endif
+
+static inline void si_write_unlock(struct super_block *sb)
+{
+ si_pid_clr(sb);
+ __si_write_unlock(sb);
+}
+
+#if 0 /* unused */
+static inline void si_downgrade_lock(struct super_block *sb)
+{
+ __si_downgrade_lock(sb);
+}
+#endif
+
+/* ---------------------------------------------------------------------- */
+
+static inline aufs_bindex_t au_sbend(struct super_block *sb)
+{
+ SiMustAnyLock(sb);
+ return au_sbi(sb)->si_bend;
+}
+
+static inline unsigned int au_mntflags(struct super_block *sb)
+{
+ SiMustAnyLock(sb);
+ return au_sbi(sb)->si_mntflags;
+}
+
+static inline unsigned int au_sigen(struct super_block *sb)
+{
+ SiMustAnyLock(sb);
+ return au_sbi(sb)->si_generation;
+}
+
+static inline void au_ninodes_inc(struct super_block *sb)
+{
+ atomic_long_inc(&au_sbi(sb)->si_ninodes);
+}
+
+static inline void au_ninodes_dec(struct super_block *sb)
+{
+ AuDebugOn(!atomic_long_read(&au_sbi(sb)->si_ninodes));
+ atomic_long_dec(&au_sbi(sb)->si_ninodes);
+}
+
+static inline void au_nfiles_inc(struct super_block *sb)
+{
+ atomic_long_inc(&au_sbi(sb)->si_nfiles);
+}
+
+static inline void au_nfiles_dec(struct super_block *sb)
+{
+ AuDebugOn(!atomic_long_read(&au_sbi(sb)->si_nfiles));
+ atomic_long_dec(&au_sbi(sb)->si_nfiles);
+}
+
+static inline struct au_branch *au_sbr(struct super_block *sb,
+ aufs_bindex_t bindex)
+{
+ SiMustAnyLock(sb);
+ return au_sbi(sb)->si_branch[0 + bindex];
+}
+
+static inline void au_xino_brid_set(struct super_block *sb, aufs_bindex_t brid)
+{
+ SiMustWriteLock(sb);
+ au_sbi(sb)->si_xino_brid = brid;
+}
+
+static inline aufs_bindex_t au_xino_brid(struct super_block *sb)
+{
+ SiMustAnyLock(sb);
+ return au_sbi(sb)->si_xino_brid;
+}
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_SUPER_H__ */
diff -urN a/fs/aufs/sysaufs.c b/fs/aufs/sysaufs.c
--- a/fs/aufs/sysaufs.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/sysaufs.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * sysfs interface and lifetime management
+ * they are necessary regardless sysfs is disabled.
+ */
+
+#include <linux/random.h>
+#include "aufs.h"
+
+unsigned long sysaufs_si_mask;
+struct kset *sysaufs_kset;
+
+#define AuSiAttr(_name) { \
+ .attr = { .name = __stringify(_name), .mode = 0444 }, \
+ .show = sysaufs_si_##_name, \
+}
+
+static struct sysaufs_si_attr sysaufs_si_attr_xi_path = AuSiAttr(xi_path);
+struct attribute *sysaufs_si_attrs[] = {
+ &sysaufs_si_attr_xi_path.attr,
+ NULL,
+};
+
+static const struct sysfs_ops au_sbi_ops = {
+ .show = sysaufs_si_show
+};
+
+static struct kobj_type au_sbi_ktype = {
+ .release = au_si_free,
+ .sysfs_ops = &au_sbi_ops,
+ .default_attrs = sysaufs_si_attrs
+};
+
+/* ---------------------------------------------------------------------- */
+
+int sysaufs_si_init(struct au_sbinfo *sbinfo)
+{
+ int err;
+
+ sbinfo->si_kobj.kset = sysaufs_kset;
+ /* cf. sysaufs_name() */
+ err = kobject_init_and_add
+ (&sbinfo->si_kobj, &au_sbi_ktype, /*&sysaufs_kset->kobj*/NULL,
+ SysaufsSiNamePrefix "%lx", sysaufs_si_id(sbinfo));
+
+ dbgaufs_si_null(sbinfo);
+ if (!err) {
+ err = dbgaufs_si_init(sbinfo);
+ if (unlikely(err))
+ kobject_put(&sbinfo->si_kobj);
+ }
+ return err;
+}
+
+void sysaufs_fin(void)
+{
+ dbgaufs_fin();
+ sysfs_remove_group(&sysaufs_kset->kobj, sysaufs_attr_group);
+ kset_unregister(sysaufs_kset);
+}
+
+int __init sysaufs_init(void)
+{
+ int err;
+
+ do {
+ get_random_bytes(&sysaufs_si_mask, sizeof(sysaufs_si_mask));
+ } while (!sysaufs_si_mask);
+
+ err = -EINVAL;
+ sysaufs_kset = kset_create_and_add(AUFS_NAME, NULL, fs_kobj);
+ if (unlikely(!sysaufs_kset))
+ goto out;
+ err = PTR_ERR(sysaufs_kset);
+ if (IS_ERR(sysaufs_kset))
+ goto out;
+ err = sysfs_create_group(&sysaufs_kset->kobj, sysaufs_attr_group);
+ if (unlikely(err)) {
+ kset_unregister(sysaufs_kset);
+ goto out;
+ }
+
+ err = dbgaufs_init();
+ if (unlikely(err))
+ sysaufs_fin();
+out:
+ return err;
+}
diff -urN a/fs/aufs/sysaufs.h b/fs/aufs/sysaufs.h
--- a/fs/aufs/sysaufs.h 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/sysaufs.h 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * sysfs interface and mount lifetime management
+ */
+
+#ifndef __SYSAUFS_H__
+#define __SYSAUFS_H__
+
+#ifdef __KERNEL__
+
+#include <linux/sysfs.h>
+#include "module.h"
+
+struct super_block;
+struct au_sbinfo;
+
+struct sysaufs_si_attr {
+ struct attribute attr;
+ int (*show)(struct seq_file *seq, struct super_block *sb);
+};
+
+/* ---------------------------------------------------------------------- */
+
+/* sysaufs.c */
+extern unsigned long sysaufs_si_mask;
+extern struct kset *sysaufs_kset;
+extern struct attribute *sysaufs_si_attrs[];
+int sysaufs_si_init(struct au_sbinfo *sbinfo);
+int __init sysaufs_init(void);
+void sysaufs_fin(void);
+
+/* ---------------------------------------------------------------------- */
+
+/* some people doesn't like to show a pointer in kernel */
+static inline unsigned long sysaufs_si_id(struct au_sbinfo *sbinfo)
+{
+ return sysaufs_si_mask ^ (unsigned long)sbinfo;
+}
+
+#define SysaufsSiNamePrefix "si_"
+#define SysaufsSiNameLen (sizeof(SysaufsSiNamePrefix) + 16)
+static inline void sysaufs_name(struct au_sbinfo *sbinfo, char *name)
+{
+ snprintf(name, SysaufsSiNameLen, SysaufsSiNamePrefix "%lx",
+ sysaufs_si_id(sbinfo));
+}
+
+struct au_branch;
+#ifdef CONFIG_SYSFS
+/* sysfs.c */
+extern struct attribute_group *sysaufs_attr_group;
+
+int sysaufs_si_xi_path(struct seq_file *seq, struct super_block *sb);
+ssize_t sysaufs_si_show(struct kobject *kobj, struct attribute *attr,
+ char *buf);
+
+void sysaufs_br_init(struct au_branch *br);
+void sysaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex);
+void sysaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex);
+
+#define sysaufs_brs_init() do {} while (0)
+
+#else
+#define sysaufs_attr_group NULL
+
+AuStubInt0(sysaufs_si_xi_path, struct seq_file *seq, struct super_block *sb)
+
+static inline
+ssize_t sysaufs_si_show(struct kobject *kobj, struct attribute *attr,
+ char *buf)
+{
+ return 0;
+}
+
+AuStubVoid(sysaufs_br_init, struct au_branch *br)
+AuStubVoid(sysaufs_brs_add, struct super_block *sb, aufs_bindex_t bindex)
+AuStubVoid(sysaufs_brs_del, struct super_block *sb, aufs_bindex_t bindex)
+
+static inline void sysaufs_brs_init(void)
+{
+ sysaufs_brs = 0;
+}
+
+#endif /* CONFIG_SYSFS */
+
+#endif /* __KERNEL__ */
+#endif /* __SYSAUFS_H__ */
diff -urN a/fs/aufs/sysfs.c b/fs/aufs/sysfs.c
--- a/fs/aufs/sysfs.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/sysfs.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,257 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * sysfs interface
+ */
+
+#include <linux/seq_file.h>
+#include "aufs.h"
+
+#ifdef CONFIG_AUFS_FS_MODULE
+/* this entry violates the "one line per file" policy of sysfs */
+static ssize_t config_show(struct kobject *kobj, struct kobj_attribute *attr,
+ char *buf)
+{
+ ssize_t err;
+ static char *conf =
+/* this file is generated at compiling */
+#include "conf.str"
+ ;
+
+ err = snprintf(buf, PAGE_SIZE, conf);
+ if (unlikely(err >= PAGE_SIZE))
+ err = -EFBIG;
+ return err;
+}
+
+static struct kobj_attribute au_config_attr = __ATTR_RO(config);
+#endif
+
+static struct attribute *au_attr[] = {
+#ifdef CONFIG_AUFS_FS_MODULE
+ &au_config_attr.attr,
+#endif
+ NULL, /* need to NULL terminate the list of attributes */
+};
+
+static struct attribute_group sysaufs_attr_group_body = {
+ .attrs = au_attr
+};
+
+struct attribute_group *sysaufs_attr_group = &sysaufs_attr_group_body;
+
+/* ---------------------------------------------------------------------- */
+
+int sysaufs_si_xi_path(struct seq_file *seq, struct super_block *sb)
+{
+ int err;
+
+ SiMustAnyLock(sb);
+
+ err = 0;
+ if (au_opt_test(au_mntflags(sb), XINO)) {
+ err = au_xino_path(seq, au_sbi(sb)->si_xib);
+ seq_putc(seq, '\n');
+ }
+ return err;
+}
+
+/*
+ * the lifetime of branch is independent from the entry under sysfs.
+ * sysfs handles the lifetime of the entry, and never call ->show() after it is
+ * unlinked.
+ */
+static int sysaufs_si_br(struct seq_file *seq, struct super_block *sb,
+ aufs_bindex_t bindex)
+{
+ int err;
+ struct path path;
+ struct dentry *root;
+ struct au_branch *br;
+ char *perm;
+
+ AuDbg("b%d\n", bindex);
+
+ err = 0;
+ root = sb->s_root;
+ di_read_lock_parent(root, !AuLock_IR);
+ br = au_sbr(sb, bindex);
+ path.mnt = br->br_mnt;
+ path.dentry = au_h_dptr(root, bindex);
+ au_seq_path(seq, &path);
+ di_read_unlock(root, !AuLock_IR);
+ perm = au_optstr_br_perm(br->br_perm);
+ if (perm) {
+ err = seq_printf(seq, "=%s\n", perm);
+ kfree(perm);
+ if (err == -1)
+ err = -E2BIG;
+ } else
+ err = -ENOMEM;
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static struct seq_file *au_seq(char *p, ssize_t len)
+{
+ struct seq_file *seq;
+
+ seq = kzalloc(sizeof(*seq), GFP_NOFS);
+ if (seq) {
+ /* mutex_init(&seq.lock); */
+ seq->buf = p;
+ seq->size = len;
+ return seq; /* success */
+ }
+
+ seq = ERR_PTR(-ENOMEM);
+ return seq;
+}
+
+#define SysaufsBr_PREFIX "br"
+
+/* todo: file size may exceed PAGE_SIZE */
+ssize_t sysaufs_si_show(struct kobject *kobj, struct attribute *attr,
+ char *buf)
+{
+ ssize_t err;
+ long l;
+ aufs_bindex_t bend;
+ struct au_sbinfo *sbinfo;
+ struct super_block *sb;
+ struct seq_file *seq;
+ char *name;
+ struct attribute **cattr;
+
+ sbinfo = container_of(kobj, struct au_sbinfo, si_kobj);
+ sb = sbinfo->si_sb;
+
+ /*
+ * prevent a race condition between sysfs and aufs.
+ * for instance, sysfs_file_read() calls sysfs_get_active_two() which
+ * prohibits maintaining the sysfs entries.
+ * hew we acquire read lock after sysfs_get_active_two().
+ * on the other hand, the remount process may maintain the sysfs/aufs
+ * entries after acquiring write lock.
+ * it can cause a deadlock.
+ * simply we gave up processing read here.
+ */
+ err = -EBUSY;
+ if (unlikely(!si_noflush_read_trylock(sb)))
+ goto out;
+
+ seq = au_seq(buf, PAGE_SIZE);
+ err = PTR_ERR(seq);
+ if (IS_ERR(seq))
+ goto out_unlock;
+
+ name = (void *)attr->name;
+ cattr = sysaufs_si_attrs;
+ while (*cattr) {
+ if (!strcmp(name, (*cattr)->name)) {
+ err = container_of(*cattr, struct sysaufs_si_attr, attr)
+ ->show(seq, sb);
+ goto out_seq;
+ }
+ cattr++;
+ }
+
+ bend = au_sbend(sb);
+ if (!strncmp(name, SysaufsBr_PREFIX, sizeof(SysaufsBr_PREFIX) - 1)) {
+ name += sizeof(SysaufsBr_PREFIX) - 1;
+ err = kstrtol(name, 10, &l);
+ if (!err) {
+ if (l <= bend)
+ err = sysaufs_si_br(seq, sb, (aufs_bindex_t)l);
+ else
+ err = -ENOENT;
+ }
+ goto out_seq;
+ }
+ BUG();
+
+out_seq:
+ if (!err) {
+ err = seq->count;
+ /* sysfs limit */
+ if (unlikely(err == PAGE_SIZE))
+ err = -EFBIG;
+ }
+ kfree(seq);
+out_unlock:
+ si_read_unlock(sb);
+out:
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+void sysaufs_br_init(struct au_branch *br)
+{
+ struct attribute *attr = &br->br_attr;
+
+ sysfs_attr_init(attr);
+ attr->name = br->br_name;
+ attr->mode = S_IRUGO;
+}
+
+void sysaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex)
+{
+ struct au_branch *br;
+ struct kobject *kobj;
+ aufs_bindex_t bend;
+
+ dbgaufs_brs_del(sb, bindex);
+
+ if (!sysaufs_brs)
+ return;
+
+ kobj = &au_sbi(sb)->si_kobj;
+ bend = au_sbend(sb);
+ for (; bindex <= bend; bindex++) {
+ br = au_sbr(sb, bindex);
+ sysfs_remove_file(kobj, &br->br_attr);
+ }
+}
+
+void sysaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex)
+{
+ int err;
+ aufs_bindex_t bend;
+ struct kobject *kobj;
+ struct au_branch *br;
+
+ dbgaufs_brs_add(sb, bindex);
+
+ if (!sysaufs_brs)
+ return;
+
+ kobj = &au_sbi(sb)->si_kobj;
+ bend = au_sbend(sb);
+ for (; bindex <= bend; bindex++) {
+ br = au_sbr(sb, bindex);
+ snprintf(br->br_name, sizeof(br->br_name), SysaufsBr_PREFIX
+ "%d", bindex);
+ err = sysfs_create_file(kobj, &br->br_attr);
+ if (unlikely(err))
+ pr_warning("failed %s under sysfs(%d)\n",
+ br->br_name, err);
+ }
+}
diff -urN a/fs/aufs/sysrq.c b/fs/aufs/sysrq.c
--- a/fs/aufs/sysrq.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/sysrq.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,148 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * magic sysrq hanlder
+ */
+
+/* #include <linux/sysrq.h> */
+#include <linux/writeback.h>
+#include "aufs.h"
+
+/* ---------------------------------------------------------------------- */
+
+static void sysrq_sb(struct super_block *sb)
+{
+ char *plevel;
+ struct au_sbinfo *sbinfo;
+ struct file *file;
+
+ plevel = au_plevel;
+ au_plevel = KERN_WARNING;
+
+ sbinfo = au_sbi(sb);
+ /* since we define pr_fmt, call printk directly */
+ printk(KERN_WARNING "si=%lx\n", sysaufs_si_id(sbinfo));
+ printk(KERN_WARNING AUFS_NAME ": superblock\n");
+ au_dpri_sb(sb);
+
+#if 0
+ printk(KERN_WARNING AUFS_NAME ": root dentry\n");
+ au_dpri_dentry(sb->s_root);
+ printk(KERN_WARNING AUFS_NAME ": root inode\n");
+ au_dpri_inode(sb->s_root->d_inode);
+#endif
+
+#if 0
+ do {
+ int err, i, j, ndentry;
+ struct au_dcsub_pages dpages;
+ struct au_dpage *dpage;
+
+ err = au_dpages_init(&dpages, GFP_ATOMIC);
+ if (unlikely(err))
+ break;
+ err = au_dcsub_pages(&dpages, sb->s_root, NULL, NULL);
+ if (!err)
+ for (i = 0; i < dpages.ndpage; i++) {
+ dpage = dpages.dpages + i;
+ ndentry = dpage->ndentry;
+ for (j = 0; j < ndentry; j++)
+ au_dpri_dentry(dpage->dentries[j]);
+ }
+ au_dpages_free(&dpages);
+ } while (0);
+#endif
+
+#if 1
+ {
+ struct inode *i;
+ printk(KERN_WARNING AUFS_NAME ": isolated inode\n");
+ spin_lock(&inode_sb_list_lock);
+ list_for_each_entry(i, &sb->s_inodes, i_sb_list) {
+ spin_lock(&i->i_lock);
+ if (1 || list_empty(&i->i_dentry))
+ au_dpri_inode(i);
+ spin_unlock(&i->i_lock);
+ }
+ spin_unlock(&inode_sb_list_lock);
+ }
+#endif
+ printk(KERN_WARNING AUFS_NAME ": files\n");
+ lg_global_lock(files_lglock);
+ do_file_list_for_each_entry(sb, file) {
+ umode_t mode;
+ mode = file->f_dentry->d_inode->i_mode;
+ if (!special_file(mode) || au_special_file(mode))
+ au_dpri_file(file);
+ } while_file_list_for_each_entry;
+ lg_global_unlock(files_lglock);
+ printk(KERN_WARNING AUFS_NAME ": done\n");
+
+ au_plevel = plevel;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* module parameter */
+static char *aufs_sysrq_key = "a";
+module_param_named(sysrq, aufs_sysrq_key, charp, S_IRUGO);
+MODULE_PARM_DESC(sysrq, "MagicSysRq key for " AUFS_NAME);
+
+static void au_sysrq(int key __maybe_unused)
+{
+ struct au_sbinfo *sbinfo;
+
+ lockdep_off();
+ au_sbilist_lock();
+ list_for_each_entry(sbinfo, &au_sbilist.head, si_list)
+ sysrq_sb(sbinfo->si_sb);
+ au_sbilist_unlock();
+ lockdep_on();
+}
+
+static struct sysrq_key_op au_sysrq_op = {
+ .handler = au_sysrq,
+ .help_msg = "Aufs",
+ .action_msg = "Aufs",
+ .enable_mask = SYSRQ_ENABLE_DUMP
+};
+
+/* ---------------------------------------------------------------------- */
+
+int __init au_sysrq_init(void)
+{
+ int err;
+ char key;
+
+ err = -1;
+ key = *aufs_sysrq_key;
+ if ('a' <= key && key <= 'z')
+ err = register_sysrq_key(key, &au_sysrq_op);
+ if (unlikely(err))
+ pr_err("err %d, sysrq=%c\n", err, key);
+ return err;
+}
+
+void au_sysrq_fin(void)
+{
+ int err;
+ err = unregister_sysrq_key(*aufs_sysrq_key, &au_sysrq_op);
+ if (unlikely(err))
+ pr_err("err %d (ignored)\n", err);
+}
diff -urN a/fs/aufs/vdir.c b/fs/aufs/vdir.c
--- a/fs/aufs/vdir.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/vdir.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,885 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * virtual or vertical directory
+ */
+
+#include "aufs.h"
+
+static unsigned int calc_size(int nlen)
+{
+ return ALIGN(sizeof(struct au_vdir_de) + nlen, sizeof(ino_t));
+}
+
+static int set_deblk_end(union au_vdir_deblk_p *p,
+ union au_vdir_deblk_p *deblk_end)
+{
+ if (calc_size(0) <= deblk_end->deblk - p->deblk) {
+ p->de->de_str.len = 0;
+ /* smp_mb(); */
+ return 0;
+ }
+ return -1; /* error */
+}
+
+/* returns true or false */
+static int is_deblk_end(union au_vdir_deblk_p *p,
+ union au_vdir_deblk_p *deblk_end)
+{
+ if (calc_size(0) <= deblk_end->deblk - p->deblk)
+ return !p->de->de_str.len;
+ return 1;
+}
+
+static unsigned char *last_deblk(struct au_vdir *vdir)
+{
+ return vdir->vd_deblk[vdir->vd_nblk - 1];
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* estimate the apropriate size for name hash table */
+unsigned int au_rdhash_est(loff_t sz)
+{
+ unsigned int n;
+
+ n = UINT_MAX;
+ sz >>= 10;
+ if (sz < n)
+ n = sz;
+ if (sz < AUFS_RDHASH_DEF)
+ n = AUFS_RDHASH_DEF;
+ /* pr_info("n %u\n", n); */
+ return n;
+}
+
+/*
+ * the allocated memory has to be freed by
+ * au_nhash_wh_free() or au_nhash_de_free().
+ */
+int au_nhash_alloc(struct au_nhash *nhash, unsigned int num_hash, gfp_t gfp)
+{
+ struct hlist_head *head;
+ unsigned int u;
+
+ head = kmalloc(sizeof(*nhash->nh_head) * num_hash, gfp);
+ if (head) {
+ nhash->nh_num = num_hash;
+ nhash->nh_head = head;
+ for (u = 0; u < num_hash; u++)
+ INIT_HLIST_HEAD(head++);
+ return 0; /* success */
+ }
+
+ return -ENOMEM;
+}
+
+static void nhash_count(struct hlist_head *head)
+{
+#if 0
+ unsigned long n;
+ struct hlist_node *pos;
+
+ n = 0;
+ hlist_for_each(pos, head)
+ n++;
+ pr_info("%lu\n", n);
+#endif
+}
+
+static void au_nhash_wh_do_free(struct hlist_head *head)
+{
+ struct au_vdir_wh *tpos;
+ struct hlist_node *pos, *node;
+
+ hlist_for_each_entry_safe(tpos, pos, node, head, wh_hash) {
+ /* hlist_del(pos); */
+ kfree(tpos);
+ }
+}
+
+static void au_nhash_de_do_free(struct hlist_head *head)
+{
+ struct au_vdir_dehstr *tpos;
+ struct hlist_node *pos, *node;
+
+ hlist_for_each_entry_safe(tpos, pos, node, head, hash) {
+ /* hlist_del(pos); */
+ au_cache_free_vdir_dehstr(tpos);
+ }
+}
+
+static void au_nhash_do_free(struct au_nhash *nhash,
+ void (*free)(struct hlist_head *head))
+{
+ unsigned int n;
+ struct hlist_head *head;
+
+ n = nhash->nh_num;
+ if (!n)
+ return;
+
+ head = nhash->nh_head;
+ while (n-- > 0) {
+ nhash_count(head);
+ free(head++);
+ }
+ kfree(nhash->nh_head);
+}
+
+void au_nhash_wh_free(struct au_nhash *whlist)
+{
+ au_nhash_do_free(whlist, au_nhash_wh_do_free);
+}
+
+static void au_nhash_de_free(struct au_nhash *delist)
+{
+ au_nhash_do_free(delist, au_nhash_de_do_free);
+}
+
+/* ---------------------------------------------------------------------- */
+
+int au_nhash_test_longer_wh(struct au_nhash *whlist, aufs_bindex_t btgt,
+ int limit)
+{
+ int num;
+ unsigned int u, n;
+ struct hlist_head *head;
+ struct au_vdir_wh *tpos;
+ struct hlist_node *pos;
+
+ num = 0;
+ n = whlist->nh_num;
+ head = whlist->nh_head;
+ for (u = 0; u < n; u++, head++)
+ hlist_for_each_entry(tpos, pos, head, wh_hash)
+ if (tpos->wh_bindex == btgt && ++num > limit)
+ return 1;
+ return 0;
+}
+
+static struct hlist_head *au_name_hash(struct au_nhash *nhash,
+ unsigned char *name,
+ unsigned int len)
+{
+ unsigned int v;
+ /* const unsigned int magic_bit = 12; */
+
+ AuDebugOn(!nhash->nh_num || !nhash->nh_head);
+
+ v = 0;
+ while (len--)
+ v += *name++;
+ /* v = hash_long(v, magic_bit); */
+ v %= nhash->nh_num;
+ return nhash->nh_head + v;
+}
+
+static int au_nhash_test_name(struct au_vdir_destr *str, const char *name,
+ int nlen)
+{
+ return str->len == nlen && !memcmp(str->name, name, nlen);
+}
+
+/* returns found or not */
+int au_nhash_test_known_wh(struct au_nhash *whlist, char *name, int nlen)
+{
+ struct hlist_head *head;
+ struct au_vdir_wh *tpos;
+ struct hlist_node *pos;
+ struct au_vdir_destr *str;
+
+ head = au_name_hash(whlist, name, nlen);
+ hlist_for_each_entry(tpos, pos, head, wh_hash) {
+ str = &tpos->wh_str;
+ AuDbg("%.*s\n", str->len, str->name);
+ if (au_nhash_test_name(str, name, nlen))
+ return 1;
+ }
+ return 0;
+}
+
+/* returns found(true) or not */
+static int test_known(struct au_nhash *delist, char *name, int nlen)
+{
+ struct hlist_head *head;
+ struct au_vdir_dehstr *tpos;
+ struct hlist_node *pos;
+ struct au_vdir_destr *str;
+
+ head = au_name_hash(delist, name, nlen);
+ hlist_for_each_entry(tpos, pos, head, hash) {
+ str = tpos->str;
+ AuDbg("%.*s\n", str->len, str->name);
+ if (au_nhash_test_name(str, name, nlen))
+ return 1;
+ }
+ return 0;
+}
+
+static void au_shwh_init_wh(struct au_vdir_wh *wh, ino_t ino,
+ unsigned char d_type)
+{
+#ifdef CONFIG_AUFS_SHWH
+ wh->wh_ino = ino;
+ wh->wh_type = d_type;
+#endif
+}
+
+/* ---------------------------------------------------------------------- */
+
+int au_nhash_append_wh(struct au_nhash *whlist, char *name, int nlen, ino_t ino,
+ unsigned int d_type, aufs_bindex_t bindex,
+ unsigned char shwh)
+{
+ int err;
+ struct au_vdir_destr *str;
+ struct au_vdir_wh *wh;
+
+ AuDbg("%.*s\n", nlen, name);
+ AuDebugOn(!whlist->nh_num || !whlist->nh_head);
+
+ err = -ENOMEM;
+ wh = kmalloc(sizeof(*wh) + nlen, GFP_NOFS);
+ if (unlikely(!wh))
+ goto out;
+
+ err = 0;
+ wh->wh_bindex = bindex;
+ if (shwh)
+ au_shwh_init_wh(wh, ino, d_type);
+ str = &wh->wh_str;
+ str->len = nlen;
+ memcpy(str->name, name, nlen);
+ hlist_add_head(&wh->wh_hash, au_name_hash(whlist, name, nlen));
+ /* smp_mb(); */
+
+out:
+ return err;
+}
+
+static int append_deblk(struct au_vdir *vdir)
+{
+ int err;
+ unsigned long ul;
+ const unsigned int deblk_sz = vdir->vd_deblk_sz;
+ union au_vdir_deblk_p p, deblk_end;
+ unsigned char **o;
+
+ err = -ENOMEM;
+ o = krealloc(vdir->vd_deblk, sizeof(*o) * (vdir->vd_nblk + 1),
+ GFP_NOFS);
+ if (unlikely(!o))
+ goto out;
+
+ vdir->vd_deblk = o;
+ p.deblk = kmalloc(deblk_sz, GFP_NOFS);
+ if (p.deblk) {
+ ul = vdir->vd_nblk++;
+ vdir->vd_deblk[ul] = p.deblk;
+ vdir->vd_last.ul = ul;
+ vdir->vd_last.p.deblk = p.deblk;
+ deblk_end.deblk = p.deblk + deblk_sz;
+ err = set_deblk_end(&p, &deblk_end);
+ }
+
+out:
+ return err;
+}
+
+static int append_de(struct au_vdir *vdir, char *name, int nlen, ino_t ino,
+ unsigned int d_type, struct au_nhash *delist)
+{
+ int err;
+ unsigned int sz;
+ const unsigned int deblk_sz = vdir->vd_deblk_sz;
+ union au_vdir_deblk_p p, *room, deblk_end;
+ struct au_vdir_dehstr *dehstr;
+
+ p.deblk = last_deblk(vdir);
+ deblk_end.deblk = p.deblk + deblk_sz;
+ room = &vdir->vd_last.p;
+ AuDebugOn(room->deblk < p.deblk || deblk_end.deblk <= room->deblk
+ || !is_deblk_end(room, &deblk_end));
+
+ sz = calc_size(nlen);
+ if (unlikely(sz > deblk_end.deblk - room->deblk)) {
+ err = append_deblk(vdir);
+ if (unlikely(err))
+ goto out;
+
+ p.deblk = last_deblk(vdir);
+ deblk_end.deblk = p.deblk + deblk_sz;
+ /* smp_mb(); */
+ AuDebugOn(room->deblk != p.deblk);
+ }
+
+ err = -ENOMEM;
+ dehstr = au_cache_alloc_vdir_dehstr();
+ if (unlikely(!dehstr))
+ goto out;
+
+ dehstr->str = &room->de->de_str;
+ hlist_add_head(&dehstr->hash, au_name_hash(delist, name, nlen));
+ room->de->de_ino = ino;
+ room->de->de_type = d_type;
+ room->de->de_str.len = nlen;
+ memcpy(room->de->de_str.name, name, nlen);
+
+ err = 0;
+ room->deblk += sz;
+ if (unlikely(set_deblk_end(room, &deblk_end)))
+ err = append_deblk(vdir);
+ /* smp_mb(); */
+
+out:
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+void au_vdir_free(struct au_vdir *vdir)
+{
+ unsigned char **deblk;
+
+ deblk = vdir->vd_deblk;
+ while (vdir->vd_nblk--)
+ kfree(*deblk++);
+ kfree(vdir->vd_deblk);
+ au_cache_free_vdir(vdir);
+}
+
+static struct au_vdir *alloc_vdir(struct file *file)
+{
+ struct au_vdir *vdir;
+ struct super_block *sb;
+ int err;
+
+ sb = file->f_dentry->d_sb;
+ SiMustAnyLock(sb);
+
+ err = -ENOMEM;
+ vdir = au_cache_alloc_vdir();
+ if (unlikely(!vdir))
+ goto out;
+
+ vdir->vd_deblk = kzalloc(sizeof(*vdir->vd_deblk), GFP_NOFS);
+ if (unlikely(!vdir->vd_deblk))
+ goto out_free;
+
+ vdir->vd_deblk_sz = au_sbi(sb)->si_rdblk;
+ if (!vdir->vd_deblk_sz) {
+ /* estimate the apropriate size for deblk */
+ vdir->vd_deblk_sz = au_dir_size(file, /*dentry*/NULL);
+ /* pr_info("vd_deblk_sz %u\n", vdir->vd_deblk_sz); */
+ }
+ vdir->vd_nblk = 0;
+ vdir->vd_version = 0;
+ vdir->vd_jiffy = 0;
+ err = append_deblk(vdir);
+ if (!err)
+ return vdir; /* success */
+
+ kfree(vdir->vd_deblk);
+
+out_free:
+ au_cache_free_vdir(vdir);
+out:
+ vdir = ERR_PTR(err);
+ return vdir;
+}
+
+static int reinit_vdir(struct au_vdir *vdir)
+{
+ int err;
+ union au_vdir_deblk_p p, deblk_end;
+
+ while (vdir->vd_nblk > 1) {
+ kfree(vdir->vd_deblk[vdir->vd_nblk - 1]);
+ /* vdir->vd_deblk[vdir->vd_nblk - 1] = NULL; */
+ vdir->vd_nblk--;
+ }
+ p.deblk = vdir->vd_deblk[0];
+ deblk_end.deblk = p.deblk + vdir->vd_deblk_sz;
+ err = set_deblk_end(&p, &deblk_end);
+ /* keep vd_dblk_sz */
+ vdir->vd_last.ul = 0;
+ vdir->vd_last.p.deblk = vdir->vd_deblk[0];
+ vdir->vd_version = 0;
+ vdir->vd_jiffy = 0;
+ /* smp_mb(); */
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+#define AuFillVdir_CALLED 1
+#define AuFillVdir_WHABLE (1 << 1)
+#define AuFillVdir_SHWH (1 << 2)
+#define au_ftest_fillvdir(flags, name) ((flags) & AuFillVdir_##name)
+#define au_fset_fillvdir(flags, name) \
+ do { (flags) |= AuFillVdir_##name; } while (0)
+#define au_fclr_fillvdir(flags, name) \
+ do { (flags) &= ~AuFillVdir_##name; } while (0)
+
+#ifndef CONFIG_AUFS_SHWH
+#undef AuFillVdir_SHWH
+#define AuFillVdir_SHWH 0
+#endif
+
+struct fillvdir_arg {
+ struct file *file;
+ struct au_vdir *vdir;
+ struct au_nhash delist;
+ struct au_nhash whlist;
+ aufs_bindex_t bindex;
+ unsigned int flags;
+ int err;
+};
+
+static int fillvdir(void *__arg, const char *__name, int nlen,
+ loff_t offset __maybe_unused, u64 h_ino,
+ unsigned int d_type)
+{
+ struct fillvdir_arg *arg = __arg;
+ char *name = (void *)__name;
+ struct super_block *sb;
+ ino_t ino;
+ const unsigned char shwh = !!au_ftest_fillvdir(arg->flags, SHWH);
+
+ arg->err = 0;
+ sb = arg->file->f_dentry->d_sb;
+ au_fset_fillvdir(arg->flags, CALLED);
+ /* smp_mb(); */
+ if (nlen <= AUFS_WH_PFX_LEN
+ || memcmp(name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) {
+ if (test_known(&arg->delist, name, nlen)
+ || au_nhash_test_known_wh(&arg->whlist, name, nlen))
+ goto out; /* already exists or whiteouted */
+
+ sb = arg->file->f_dentry->d_sb;
+ arg->err = au_ino(sb, arg->bindex, h_ino, d_type, &ino);
+ if (!arg->err) {
+ if (unlikely(nlen > AUFS_MAX_NAMELEN))
+ d_type = DT_UNKNOWN;
+ arg->err = append_de(arg->vdir, name, nlen, ino,
+ d_type, &arg->delist);
+ }
+ } else if (au_ftest_fillvdir(arg->flags, WHABLE)) {
+ name += AUFS_WH_PFX_LEN;
+ nlen -= AUFS_WH_PFX_LEN;
+ if (au_nhash_test_known_wh(&arg->whlist, name, nlen))
+ goto out; /* already whiteouted */
+
+ if (shwh)
+ arg->err = au_wh_ino(sb, arg->bindex, h_ino, d_type,
+ &ino);
+ if (!arg->err) {
+ if (nlen <= AUFS_MAX_NAMELEN + AUFS_WH_PFX_LEN)
+ d_type = DT_UNKNOWN;
+ arg->err = au_nhash_append_wh
+ (&arg->whlist, name, nlen, ino, d_type,
+ arg->bindex, shwh);
+ }
+ }
+
+out:
+ if (!arg->err)
+ arg->vdir->vd_jiffy = jiffies;
+ /* smp_mb(); */
+ AuTraceErr(arg->err);
+ return arg->err;
+}
+
+static int au_handle_shwh(struct super_block *sb, struct au_vdir *vdir,
+ struct au_nhash *whlist, struct au_nhash *delist)
+{
+#ifdef CONFIG_AUFS_SHWH
+ int err;
+ unsigned int nh, u;
+ struct hlist_head *head;
+ struct au_vdir_wh *tpos;
+ struct hlist_node *pos, *n;
+ char *p, *o;
+ struct au_vdir_destr *destr;
+
+ AuDebugOn(!au_opt_test(au_mntflags(sb), SHWH));
+
+ err = -ENOMEM;
+ o = p = __getname_gfp(GFP_NOFS);
+ if (unlikely(!p))
+ goto out;
+
+ err = 0;
+ nh = whlist->nh_num;
+ memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN);
+ p += AUFS_WH_PFX_LEN;
+ for (u = 0; u < nh; u++) {
+ head = whlist->nh_head + u;
+ hlist_for_each_entry_safe(tpos, pos, n, head, wh_hash) {
+ destr = &tpos->wh_str;
+ memcpy(p, destr->name, destr->len);
+ err = append_de(vdir, o, destr->len + AUFS_WH_PFX_LEN,
+ tpos->wh_ino, tpos->wh_type, delist);
+ if (unlikely(err))
+ break;
+ }
+ }
+
+ __putname(o);
+
+out:
+ AuTraceErr(err);
+ return err;
+#else
+ return 0;
+#endif
+}
+
+static int au_do_read_vdir(struct fillvdir_arg *arg)
+{
+ int err;
+ unsigned int rdhash;
+ loff_t offset;
+ aufs_bindex_t bend, bindex, bstart;
+ unsigned char shwh;
+ struct file *hf, *file;
+ struct super_block *sb;
+
+ file = arg->file;
+ sb = file->f_dentry->d_sb;
+ SiMustAnyLock(sb);
+
+ rdhash = au_sbi(sb)->si_rdhash;
+ if (!rdhash)
+ rdhash = au_rdhash_est(au_dir_size(file, /*dentry*/NULL));
+ err = au_nhash_alloc(&arg->delist, rdhash, GFP_NOFS);
+ if (unlikely(err))
+ goto out;
+ err = au_nhash_alloc(&arg->whlist, rdhash, GFP_NOFS);
+ if (unlikely(err))
+ goto out_delist;
+
+ err = 0;
+ arg->flags = 0;
+ shwh = 0;
+ if (au_opt_test(au_mntflags(sb), SHWH)) {
+ shwh = 1;
+ au_fset_fillvdir(arg->flags, SHWH);
+ }
+ bstart = au_fbstart(file);
+ bend = au_fbend_dir(file);
+ for (bindex = bstart; !err && bindex <= bend; bindex++) {
+ hf = au_hf_dir(file, bindex);
+ if (!hf)
+ continue;
+
+ offset = vfsub_llseek(hf, 0, SEEK_SET);
+ err = offset;
+ if (unlikely(offset))
+ break;
+
+ arg->bindex = bindex;
+ au_fclr_fillvdir(arg->flags, WHABLE);
+ if (shwh
+ || (bindex != bend
+ && au_br_whable(au_sbr_perm(sb, bindex))))
+ au_fset_fillvdir(arg->flags, WHABLE);
+ do {
+ arg->err = 0;
+ au_fclr_fillvdir(arg->flags, CALLED);
+ /* smp_mb(); */
+ err = vfsub_readdir(hf, fillvdir, arg);
+ if (err >= 0)
+ err = arg->err;
+ } while (!err && au_ftest_fillvdir(arg->flags, CALLED));
+ }
+
+ if (!err && shwh)
+ err = au_handle_shwh(sb, arg->vdir, &arg->whlist, &arg->delist);
+
+ au_nhash_wh_free(&arg->whlist);
+
+out_delist:
+ au_nhash_de_free(&arg->delist);
+out:
+ return err;
+}
+
+static int read_vdir(struct file *file, int may_read)
+{
+ int err;
+ unsigned long expire;
+ unsigned char do_read;
+ struct fillvdir_arg arg;
+ struct inode *inode;
+ struct au_vdir *vdir, *allocated;
+
+ err = 0;
+ inode = file->f_dentry->d_inode;
+ IMustLock(inode);
+ SiMustAnyLock(inode->i_sb);
+
+ allocated = NULL;
+ do_read = 0;
+ expire = au_sbi(inode->i_sb)->si_rdcache;
+ vdir = au_ivdir(inode);
+ if (!vdir) {
+ do_read = 1;
+ vdir = alloc_vdir(file);
+ err = PTR_ERR(vdir);
+ if (IS_ERR(vdir))
+ goto out;
+ err = 0;
+ allocated = vdir;
+ } else if (may_read
+ && (inode->i_version != vdir->vd_version
+ || time_after(jiffies, vdir->vd_jiffy + expire))) {
+ do_read = 1;
+ err = reinit_vdir(vdir);
+ if (unlikely(err))
+ goto out;
+ }
+
+ if (!do_read)
+ return 0; /* success */
+
+ arg.file = file;
+ arg.vdir = vdir;
+ err = au_do_read_vdir(&arg);
+ if (!err) {
+ /* file->f_pos = 0; */
+ vdir->vd_version = inode->i_version;
+ vdir->vd_last.ul = 0;
+ vdir->vd_last.p.deblk = vdir->vd_deblk[0];
+ if (allocated)
+ au_set_ivdir(inode, allocated);
+ } else if (allocated)
+ au_vdir_free(allocated);
+
+out:
+ return err;
+}
+
+static int copy_vdir(struct au_vdir *tgt, struct au_vdir *src)
+{
+ int err, rerr;
+ unsigned long ul, n;
+ const unsigned int deblk_sz = src->vd_deblk_sz;
+
+ AuDebugOn(tgt->vd_nblk != 1);
+
+ err = -ENOMEM;
+ if (tgt->vd_nblk < src->vd_nblk) {
+ unsigned char **p;
+
+ p = krealloc(tgt->vd_deblk, sizeof(*p) * src->vd_nblk,
+ GFP_NOFS);
+ if (unlikely(!p))
+ goto out;
+ tgt->vd_deblk = p;
+ }
+
+ if (tgt->vd_deblk_sz != deblk_sz) {
+ unsigned char *p;
+
+ tgt->vd_deblk_sz = deblk_sz;
+ p = krealloc(tgt->vd_deblk[0], deblk_sz, GFP_NOFS);
+ if (unlikely(!p))
+ goto out;
+ tgt->vd_deblk[0] = p;
+ }
+ memcpy(tgt->vd_deblk[0], src->vd_deblk[0], deblk_sz);
+ tgt->vd_version = src->vd_version;
+ tgt->vd_jiffy = src->vd_jiffy;
+
+ n = src->vd_nblk;
+ for (ul = 1; ul < n; ul++) {
+ tgt->vd_deblk[ul] = kmemdup(src->vd_deblk[ul], deblk_sz,
+ GFP_NOFS);
+ if (unlikely(!tgt->vd_deblk[ul]))
+ goto out;
+ tgt->vd_nblk++;
+ }
+ tgt->vd_nblk = n;
+ tgt->vd_last.ul = tgt->vd_last.ul;
+ tgt->vd_last.p.deblk = tgt->vd_deblk[tgt->vd_last.ul];
+ tgt->vd_last.p.deblk += src->vd_last.p.deblk
+ - src->vd_deblk[src->vd_last.ul];
+ /* smp_mb(); */
+ return 0; /* success */
+
+out:
+ rerr = reinit_vdir(tgt);
+ BUG_ON(rerr);
+ return err;
+}
+
+int au_vdir_init(struct file *file)
+{
+ int err;
+ struct inode *inode;
+ struct au_vdir *vdir_cache, *allocated;
+
+ err = read_vdir(file, !file->f_pos);
+ if (unlikely(err))
+ goto out;
+
+ allocated = NULL;
+ vdir_cache = au_fvdir_cache(file);
+ if (!vdir_cache) {
+ vdir_cache = alloc_vdir(file);
+ err = PTR_ERR(vdir_cache);
+ if (IS_ERR(vdir_cache))
+ goto out;
+ allocated = vdir_cache;
+ } else if (!file->f_pos && vdir_cache->vd_version != file->f_version) {
+ err = reinit_vdir(vdir_cache);
+ if (unlikely(err))
+ goto out;
+ } else
+ return 0; /* success */
+
+ inode = file->f_dentry->d_inode;
+ err = copy_vdir(vdir_cache, au_ivdir(inode));
+ if (!err) {
+ file->f_version = inode->i_version;
+ if (allocated)
+ au_set_fvdir_cache(file, allocated);
+ } else if (allocated)
+ au_vdir_free(allocated);
+
+out:
+ return err;
+}
+
+static loff_t calc_offset(struct au_vdir *vdir)
+{
+ loff_t offset;
+ union au_vdir_deblk_p p;
+
+ p.deblk = vdir->vd_deblk[vdir->vd_last.ul];
+ offset = vdir->vd_last.p.deblk - p.deblk;
+ offset += vdir->vd_deblk_sz * vdir->vd_last.ul;
+ return offset;
+}
+
+/* returns true or false */
+static int seek_vdir(struct file *file)
+{
+ int valid;
+ unsigned int deblk_sz;
+ unsigned long ul, n;
+ loff_t offset;
+ union au_vdir_deblk_p p, deblk_end;
+ struct au_vdir *vdir_cache;
+
+ valid = 1;
+ vdir_cache = au_fvdir_cache(file);
+ offset = calc_offset(vdir_cache);
+ AuDbg("offset %lld\n", offset);
+ if (file->f_pos == offset)
+ goto out;
+
+ vdir_cache->vd_last.ul = 0;
+ vdir_cache->vd_last.p.deblk = vdir_cache->vd_deblk[0];
+ if (!file->f_pos)
+ goto out;
+
+ valid = 0;
+ deblk_sz = vdir_cache->vd_deblk_sz;
+ ul = div64_u64(file->f_pos, deblk_sz);
+ AuDbg("ul %lu\n", ul);
+ if (ul >= vdir_cache->vd_nblk)
+ goto out;
+
+ n = vdir_cache->vd_nblk;
+ for (; ul < n; ul++) {
+ p.deblk = vdir_cache->vd_deblk[ul];
+ deblk_end.deblk = p.deblk + deblk_sz;
+ offset = ul;
+ offset *= deblk_sz;
+ while (!is_deblk_end(&p, &deblk_end) && offset < file->f_pos) {
+ unsigned int l;
+
+ l = calc_size(p.de->de_str.len);
+ offset += l;
+ p.deblk += l;
+ }
+ if (!is_deblk_end(&p, &deblk_end)) {
+ valid = 1;
+ vdir_cache->vd_last.ul = ul;
+ vdir_cache->vd_last.p = p;
+ break;
+ }
+ }
+
+out:
+ /* smp_mb(); */
+ AuTraceErr(!valid);
+ return valid;
+}
+
+int au_vdir_fill_de(struct file *file, void *dirent, filldir_t filldir)
+{
+ int err;
+ unsigned int l, deblk_sz;
+ union au_vdir_deblk_p deblk_end;
+ struct au_vdir *vdir_cache;
+ struct au_vdir_de *de;
+
+ vdir_cache = au_fvdir_cache(file);
+ if (!seek_vdir(file))
+ return 0;
+
+ deblk_sz = vdir_cache->vd_deblk_sz;
+ while (1) {
+ deblk_end.deblk = vdir_cache->vd_deblk[vdir_cache->vd_last.ul];
+ deblk_end.deblk += deblk_sz;
+ while (!is_deblk_end(&vdir_cache->vd_last.p, &deblk_end)) {
+ de = vdir_cache->vd_last.p.de;
+ AuDbg("%.*s, off%lld, i%lu, dt%d\n",
+ de->de_str.len, de->de_str.name, file->f_pos,
+ (unsigned long)de->de_ino, de->de_type);
+ err = filldir(dirent, de->de_str.name, de->de_str.len,
+ file->f_pos, de->de_ino, de->de_type);
+ if (unlikely(err)) {
+ AuTraceErr(err);
+ /* todo: ignore the error caused by udba? */
+ /* return err; */
+ return 0;
+ }
+
+ l = calc_size(de->de_str.len);
+ vdir_cache->vd_last.p.deblk += l;
+ file->f_pos += l;
+ }
+ if (vdir_cache->vd_last.ul < vdir_cache->vd_nblk - 1) {
+ vdir_cache->vd_last.ul++;
+ vdir_cache->vd_last.p.deblk
+ = vdir_cache->vd_deblk[vdir_cache->vd_last.ul];
+ file->f_pos = deblk_sz * vdir_cache->vd_last.ul;
+ continue;
+ }
+ break;
+ }
+
+ /* smp_mb(); */
+ return 0;
+}
diff -urN a/fs/aufs/vfsub.c b/fs/aufs/vfsub.c
--- a/fs/aufs/vfsub.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/vfsub.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,835 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * sub-routines for VFS
+ */
+
+#include <linux/ima.h>
+#include <linux/namei.h>
+#include <linux/security.h>
+#include <linux/splice.h>
+#include "aufs.h"
+
+int vfsub_update_h_iattr(struct path *h_path, int *did)
+{
+ int err;
+ struct kstat st;
+ struct super_block *h_sb;
+
+ /* for remote fs, leave work for its getattr or d_revalidate */
+ /* for bad i_attr fs, handle them in aufs_getattr() */
+ /* still some fs may acquire i_mutex. we need to skip them */
+ err = 0;
+ if (!did)
+ did = &err;
+ h_sb = h_path->dentry->d_sb;
+ *did = (!au_test_fs_remote(h_sb) && au_test_fs_refresh_iattr(h_sb));
+ if (*did)
+ err = vfs_getattr(h_path->mnt, h_path->dentry, &st);
+
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct file *vfsub_dentry_open(struct path *path, int flags)
+{
+ struct file *file;
+
+ path_get(path);
+ file = dentry_open(path->dentry, path->mnt,
+ flags /* | __FMODE_NONOTIFY */,
+ current_cred());
+ if (!IS_ERR_OR_NULL(file)
+ && (file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
+ i_readcount_inc(path->dentry->d_inode);
+
+ return file;
+}
+
+struct file *vfsub_filp_open(const char *path, int oflags, int mode)
+{
+ struct file *file;
+
+ lockdep_off();
+ file = filp_open(path,
+ oflags /* | __FMODE_NONOTIFY */,
+ mode);
+ lockdep_on();
+ if (IS_ERR(file))
+ goto out;
+ vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
+
+out:
+ return file;
+}
+
+int vfsub_kern_path(const char *name, unsigned int flags, struct path *path)
+{
+ int err;
+
+ err = kern_path(name, flags, path);
+ if (!err && path->dentry->d_inode)
+ vfsub_update_h_iattr(path, /*did*/NULL); /*ignore*/
+ return err;
+}
+
+struct dentry *vfsub_lookup_one_len(const char *name, struct dentry *parent,
+ int len)
+{
+ struct path path = {
+ .mnt = NULL
+ };
+
+ /* VFS checks it too, but by WARN_ON_ONCE() */
+ IMustLock(parent->d_inode);
+
+ path.dentry = lookup_one_len(name, parent, len);
+ if (IS_ERR(path.dentry))
+ goto out;
+ if (path.dentry->d_inode)
+ vfsub_update_h_iattr(&path, /*did*/NULL); /*ignore*/
+
+out:
+ AuTraceErrPtr(path.dentry);
+ return path.dentry;
+}
+
+struct dentry *vfsub_lookup_hash(struct nameidata *nd)
+{
+ struct path path = {
+ .mnt = nd->path.mnt
+ };
+
+ IMustLock(nd->path.dentry->d_inode);
+
+ path.dentry = lookup_hash(nd);
+ if (IS_ERR(path.dentry))
+ goto out;
+ if (path.dentry->d_inode)
+ vfsub_update_h_iattr(&path, /*did*/NULL); /*ignore*/
+
+out:
+ AuTraceErrPtr(path.dentry);
+ return path.dentry;
+}
+
+/*
+ * this is "VFS:__lookup_one_len()" which was removed and merged into
+ * VFS:lookup_one_len() by the commit.
+ * 6a96ba5 2011-03-14 kill __lookup_one_len()
+ * this function should always be equivalent to the corresponding part in
+ * VFS:lookup_one_len().
+ */
+int vfsub_name_hash(const char *name, struct qstr *this, int len)
+{
+ unsigned long hash;
+ unsigned int c;
+
+ this->name = name;
+ this->len = len;
+ if (!len)
+ return -EACCES;
+
+ hash = init_name_hash();
+ while (len--) {
+ c = *(const unsigned char *)name++;
+ if (c == '/' || c == '\0')
+ return -EACCES;
+ hash = partial_name_hash(c, hash);
+ }
+ this->hash = end_name_hash(hash);
+ return 0;
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct dentry *vfsub_lock_rename(struct dentry *d1, struct au_hinode *hdir1,
+ struct dentry *d2, struct au_hinode *hdir2)
+{
+ struct dentry *d;
+
+ lockdep_off();
+ d = lock_rename(d1, d2);
+ lockdep_on();
+ au_hn_suspend(hdir1);
+ if (hdir1 != hdir2)
+ au_hn_suspend(hdir2);
+
+ return d;
+}
+
+void vfsub_unlock_rename(struct dentry *d1, struct au_hinode *hdir1,
+ struct dentry *d2, struct au_hinode *hdir2)
+{
+ au_hn_resume(hdir1);
+ if (hdir1 != hdir2)
+ au_hn_resume(hdir2);
+ lockdep_off();
+ unlock_rename(d1, d2);
+ lockdep_on();
+}
+
+/* ---------------------------------------------------------------------- */
+
+int vfsub_create(struct inode *dir, struct path *path, int mode)
+{
+ int err;
+ struct dentry *d;
+
+ IMustLock(dir);
+
+ d = path->dentry;
+ path->dentry = d->d_parent;
+ err = security_path_mknod(path, d, mode, 0);
+ path->dentry = d;
+ if (unlikely(err))
+ goto out;
+
+ if (au_test_fs_null_nd(dir->i_sb))
+ err = vfs_create(dir, path->dentry, mode, NULL);
+ else {
+ struct nameidata h_nd;
+
+ memset(&h_nd, 0, sizeof(h_nd));
+ h_nd.flags = LOOKUP_CREATE;
+ h_nd.intent.open.flags = O_CREAT
+ | vfsub_fmode_to_uint(FMODE_READ);
+ h_nd.intent.open.create_mode = mode;
+ h_nd.path.dentry = path->dentry->d_parent;
+ h_nd.path.mnt = path->mnt;
+ path_get(&h_nd.path);
+ err = vfs_create(dir, path->dentry, mode, &h_nd);
+ path_put(&h_nd.path);
+ }
+
+ if (!err) {
+ struct path tmp = *path;
+ int did;
+
+ vfsub_update_h_iattr(&tmp, &did);
+ if (did) {
+ tmp.dentry = path->dentry->d_parent;
+ vfsub_update_h_iattr(&tmp, /*did*/NULL);
+ }
+ /*ignore*/
+ }
+
+out:
+ return err;
+}
+
+int vfsub_symlink(struct inode *dir, struct path *path, const char *symname)
+{
+ int err;
+ struct dentry *d;
+
+ IMustLock(dir);
+
+ d = path->dentry;
+ path->dentry = d->d_parent;
+ err = security_path_symlink(path, d, symname);
+ path->dentry = d;
+ if (unlikely(err))
+ goto out;
+
+ err = vfs_symlink(dir, path->dentry, symname);
+ if (!err) {
+ struct path tmp = *path;
+ int did;
+
+ vfsub_update_h_iattr(&tmp, &did);
+ if (did) {
+ tmp.dentry = path->dentry->d_parent;
+ vfsub_update_h_iattr(&tmp, /*did*/NULL);
+ }
+ /*ignore*/
+ }
+
+out:
+ return err;
+}
+
+int vfsub_mknod(struct inode *dir, struct path *path, int mode, dev_t dev)
+{
+ int err;
+ struct dentry *d;
+
+ IMustLock(dir);
+
+ d = path->dentry;
+ path->dentry = d->d_parent;
+ err = security_path_mknod(path, d, mode, new_encode_dev(dev));
+ path->dentry = d;
+ if (unlikely(err))
+ goto out;
+
+ err = vfs_mknod(dir, path->dentry, mode, dev);
+ if (!err) {
+ struct path tmp = *path;
+ int did;
+
+ vfsub_update_h_iattr(&tmp, &did);
+ if (did) {
+ tmp.dentry = path->dentry->d_parent;
+ vfsub_update_h_iattr(&tmp, /*did*/NULL);
+ }
+ /*ignore*/
+ }
+
+out:
+ return err;
+}
+
+static int au_test_nlink(struct inode *inode)
+{
+ const unsigned int link_max = UINT_MAX >> 1; /* rough margin */
+
+ if (!au_test_fs_no_limit_nlink(inode->i_sb)
+ || inode->i_nlink < link_max)
+ return 0;
+ return -EMLINK;
+}
+
+int vfsub_link(struct dentry *src_dentry, struct inode *dir, struct path *path)
+{
+ int err;
+ struct dentry *d;
+
+ IMustLock(dir);
+
+ err = au_test_nlink(src_dentry->d_inode);
+ if (unlikely(err))
+ return err;
+
+ d = path->dentry;
+ path->dentry = d->d_parent;
+ err = security_path_link(src_dentry, path, d);
+ path->dentry = d;
+ if (unlikely(err))
+ goto out;
+
+ lockdep_off();
+ err = vfs_link(src_dentry, dir, path->dentry);
+ lockdep_on();
+ if (!err) {
+ struct path tmp = *path;
+ int did;
+
+ /* fuse has different memory inode for the same inumber */
+ vfsub_update_h_iattr(&tmp, &did);
+ if (did) {
+ tmp.dentry = path->dentry->d_parent;
+ vfsub_update_h_iattr(&tmp, /*did*/NULL);
+ tmp.dentry = src_dentry;
+ vfsub_update_h_iattr(&tmp, /*did*/NULL);
+ }
+ /*ignore*/
+ }
+
+out:
+ return err;
+}
+
+int vfsub_rename(struct inode *src_dir, struct dentry *src_dentry,
+ struct inode *dir, struct path *path)
+{
+ int err;
+ struct path tmp = {
+ .mnt = path->mnt
+ };
+ struct dentry *d;
+
+ IMustLock(dir);
+ IMustLock(src_dir);
+
+ d = path->dentry;
+ path->dentry = d->d_parent;
+ tmp.dentry = src_dentry->d_parent;
+ err = security_path_rename(&tmp, src_dentry, path, d);
+ path->dentry = d;
+ if (unlikely(err))
+ goto out;
+
+ lockdep_off();
+ err = vfs_rename(src_dir, src_dentry, dir, path->dentry);
+ lockdep_on();
+ if (!err) {
+ int did;
+
+ tmp.dentry = d->d_parent;
+ vfsub_update_h_iattr(&tmp, &did);
+ if (did) {
+ tmp.dentry = src_dentry;
+ vfsub_update_h_iattr(&tmp, /*did*/NULL);
+ tmp.dentry = src_dentry->d_parent;
+ vfsub_update_h_iattr(&tmp, /*did*/NULL);
+ }
+ /*ignore*/
+ }
+
+out:
+ return err;
+}
+
+int vfsub_mkdir(struct inode *dir, struct path *path, int mode)
+{
+ int err;
+ struct dentry *d;
+
+ IMustLock(dir);
+
+ d = path->dentry;
+ path->dentry = d->d_parent;
+ err = security_path_mkdir(path, d, mode);
+ path->dentry = d;
+ if (unlikely(err))
+ goto out;
+
+ err = vfs_mkdir(dir, path->dentry, mode);
+ if (!err) {
+ struct path tmp = *path;
+ int did;
+
+ vfsub_update_h_iattr(&tmp, &did);
+ if (did) {
+ tmp.dentry = path->dentry->d_parent;
+ vfsub_update_h_iattr(&tmp, /*did*/NULL);
+ }
+ /*ignore*/
+ }
+
+out:
+ return err;
+}
+
+int vfsub_rmdir(struct inode *dir, struct path *path)
+{
+ int err;
+ struct dentry *d;
+
+ IMustLock(dir);
+
+ d = path->dentry;
+ path->dentry = d->d_parent;
+ err = security_path_rmdir(path, d);
+ path->dentry = d;
+ if (unlikely(err))
+ goto out;
+
+ lockdep_off();
+ err = vfs_rmdir(dir, path->dentry);
+ lockdep_on();
+ if (!err) {
+ struct path tmp = {
+ .dentry = path->dentry->d_parent,
+ .mnt = path->mnt
+ };
+
+ vfsub_update_h_iattr(&tmp, /*did*/NULL); /*ignore*/
+ }
+
+out:
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* todo: support mmap_sem? */
+ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count,
+ loff_t *ppos)
+{
+ ssize_t err;
+
+ lockdep_off();
+ err = vfs_read(file, ubuf, count, ppos);
+ lockdep_on();
+ if (err >= 0)
+ vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
+ return err;
+}
+
+/* todo: kernel_read()? */
+ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count,
+ loff_t *ppos)
+{
+ ssize_t err;
+ mm_segment_t oldfs;
+ union {
+ void *k;
+ char __user *u;
+ } buf;
+
+ buf.k = kbuf;
+ oldfs = get_fs();
+ set_fs(KERNEL_DS);
+ err = vfsub_read_u(file, buf.u, count, ppos);
+ set_fs(oldfs);
+ return err;
+}
+
+ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count,
+ loff_t *ppos)
+{
+ ssize_t err;
+
+ lockdep_off();
+ err = vfs_write(file, ubuf, count, ppos);
+ lockdep_on();
+ if (err >= 0)
+ vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
+ return err;
+}
+
+ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count, loff_t *ppos)
+{
+ ssize_t err;
+ mm_segment_t oldfs;
+ union {
+ void *k;
+ const char __user *u;
+ } buf;
+
+ buf.k = kbuf;
+ oldfs = get_fs();
+ set_fs(KERNEL_DS);
+ err = vfsub_write_u(file, buf.u, count, ppos);
+ set_fs(oldfs);
+ return err;
+}
+
+int vfsub_flush(struct file *file, fl_owner_t id)
+{
+ int err;
+
+ err = 0;
+ if (file->f_op && file->f_op->flush) {
+ if (!au_test_nfs(file->f_dentry->d_sb))
+ err = file->f_op->flush(file, id);
+ else {
+ lockdep_off();
+ err = file->f_op->flush(file, id);
+ lockdep_on();
+ }
+ if (!err)
+ vfsub_update_h_iattr(&file->f_path, /*did*/NULL);
+ /*ignore*/
+ }
+ return err;
+}
+
+int vfsub_readdir(struct file *file, filldir_t filldir, void *arg)
+{
+ int err;
+
+ lockdep_off();
+ err = vfs_readdir(file, filldir, arg);
+ lockdep_on();
+ if (err >= 0)
+ vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
+ return err;
+}
+
+long vfsub_splice_to(struct file *in, loff_t *ppos,
+ struct pipe_inode_info *pipe, size_t len,
+ unsigned int flags)
+{
+ long err;
+
+ lockdep_off();
+ err = do_splice_to(in, ppos, pipe, len, flags);
+ lockdep_on();
+ file_accessed(in);
+ if (err >= 0)
+ vfsub_update_h_iattr(&in->f_path, /*did*/NULL); /*ignore*/
+ return err;
+}
+
+long vfsub_splice_from(struct pipe_inode_info *pipe, struct file *out,
+ loff_t *ppos, size_t len, unsigned int flags)
+{
+ long err;
+
+ lockdep_off();
+ err = do_splice_from(pipe, out, ppos, len, flags);
+ lockdep_on();
+ if (err >= 0)
+ vfsub_update_h_iattr(&out->f_path, /*did*/NULL); /*ignore*/
+ return err;
+}
+
+int vfsub_fsync(struct file *file, struct path *path, int datasync)
+{
+ int err;
+
+ /* file can be NULL */
+ lockdep_off();
+ err = vfs_fsync(file, datasync);
+ lockdep_on();
+ if (!err) {
+ if (!path) {
+ AuDebugOn(!file);
+ path = &file->f_path;
+ }
+ vfsub_update_h_iattr(path, /*did*/NULL); /*ignore*/
+ }
+ return err;
+}
+
+/* cf. open.c:do_sys_truncate() and do_sys_ftruncate() */
+int vfsub_trunc(struct path *h_path, loff_t length, unsigned int attr,
+ struct file *h_file)
+{
+ int err;
+ struct inode *h_inode;
+
+ h_inode = h_path->dentry->d_inode;
+ if (!h_file) {
+ err = mnt_want_write(h_path->mnt);
+ if (err)
+ goto out;
+ err = inode_permission(h_inode, MAY_WRITE);
+ if (err)
+ goto out_mnt;
+ err = get_write_access(h_inode);
+ if (err)
+ goto out_mnt;
+ err = break_lease(h_inode, O_WRONLY);
+ if (err)
+ goto out_inode;
+ }
+
+ err = locks_verify_truncate(h_inode, h_file, length);
+ if (!err)
+ err = security_path_truncate(h_path);
+ if (!err) {
+ lockdep_off();
+ err = do_truncate(h_path->dentry, length, attr, h_file);
+ lockdep_on();
+ }
+
+out_inode:
+ if (!h_file)
+ put_write_access(h_inode);
+out_mnt:
+ if (!h_file)
+ mnt_drop_write(h_path->mnt);
+out:
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct au_vfsub_mkdir_args {
+ int *errp;
+ struct inode *dir;
+ struct path *path;
+ int mode;
+};
+
+static void au_call_vfsub_mkdir(void *args)
+{
+ struct au_vfsub_mkdir_args *a = args;
+ *a->errp = vfsub_mkdir(a->dir, a->path, a->mode);
+}
+
+int vfsub_sio_mkdir(struct inode *dir, struct path *path, int mode)
+{
+ int err, do_sio, wkq_err;
+
+ do_sio = au_test_h_perm_sio(dir, MAY_EXEC | MAY_WRITE);
+ if (!do_sio)
+ err = vfsub_mkdir(dir, path, mode);
+ else {
+ struct au_vfsub_mkdir_args args = {
+ .errp = &err,
+ .dir = dir,
+ .path = path,
+ .mode = mode
+ };
+ wkq_err = au_wkq_wait(au_call_vfsub_mkdir, &args);
+ if (unlikely(wkq_err))
+ err = wkq_err;
+ }
+
+ return err;
+}
+
+struct au_vfsub_rmdir_args {
+ int *errp;
+ struct inode *dir;
+ struct path *path;
+};
+
+static void au_call_vfsub_rmdir(void *args)
+{
+ struct au_vfsub_rmdir_args *a = args;
+ *a->errp = vfsub_rmdir(a->dir, a->path);
+}
+
+int vfsub_sio_rmdir(struct inode *dir, struct path *path)
+{
+ int err, do_sio, wkq_err;
+
+ do_sio = au_test_h_perm_sio(dir, MAY_EXEC | MAY_WRITE);
+ if (!do_sio)
+ err = vfsub_rmdir(dir, path);
+ else {
+ struct au_vfsub_rmdir_args args = {
+ .errp = &err,
+ .dir = dir,
+ .path = path
+ };
+ wkq_err = au_wkq_wait(au_call_vfsub_rmdir, &args);
+ if (unlikely(wkq_err))
+ err = wkq_err;
+ }
+
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct notify_change_args {
+ int *errp;
+ struct path *path;
+ struct iattr *ia;
+};
+
+static void call_notify_change(void *args)
+{
+ struct notify_change_args *a = args;
+ struct inode *h_inode;
+
+ h_inode = a->path->dentry->d_inode;
+ IMustLock(h_inode);
+
+ *a->errp = -EPERM;
+ if (!IS_IMMUTABLE(h_inode) && !IS_APPEND(h_inode)) {
+ *a->errp = notify_change(a->path->dentry, a->ia);
+ if (!*a->errp)
+ vfsub_update_h_iattr(a->path, /*did*/NULL); /*ignore*/
+ }
+ AuTraceErr(*a->errp);
+}
+
+int vfsub_notify_change(struct path *path, struct iattr *ia)
+{
+ int err;
+ struct notify_change_args args = {
+ .errp = &err,
+ .path = path,
+ .ia = ia
+ };
+
+ call_notify_change(&args);
+
+ return err;
+}
+
+int vfsub_sio_notify_change(struct path *path, struct iattr *ia)
+{
+ int err, wkq_err;
+ struct notify_change_args args = {
+ .errp = &err,
+ .path = path,
+ .ia = ia
+ };
+
+ wkq_err = au_wkq_wait(call_notify_change, &args);
+ if (unlikely(wkq_err))
+ err = wkq_err;
+
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct unlink_args {
+ int *errp;
+ struct inode *dir;
+ struct path *path;
+};
+
+static void call_unlink(void *args)
+{
+ struct unlink_args *a = args;
+ struct dentry *d = a->path->dentry;
+ struct inode *h_inode;
+ const int stop_sillyrename = (au_test_nfs(d->d_sb)
+ && d->d_count == 1);
+
+ IMustLock(a->dir);
+
+ a->path->dentry = d->d_parent;
+ *a->errp = security_path_unlink(a->path, d);
+ a->path->dentry = d;
+ if (unlikely(*a->errp))
+ return;
+
+ if (!stop_sillyrename)
+ dget(d);
+ h_inode = d->d_inode;
+ if (h_inode)
+ ihold(h_inode);
+
+ lockdep_off();
+ *a->errp = vfs_unlink(a->dir, d);
+ lockdep_on();
+ if (!*a->errp) {
+ struct path tmp = {
+ .dentry = d->d_parent,
+ .mnt = a->path->mnt
+ };
+ vfsub_update_h_iattr(&tmp, /*did*/NULL); /*ignore*/
+ }
+
+ if (!stop_sillyrename)
+ dput(d);
+ if (h_inode)
+ iput(h_inode);
+
+ AuTraceErr(*a->errp);
+}
+
+/*
+ * @dir: must be locked.
+ * @dentry: target dentry.
+ */
+int vfsub_unlink(struct inode *dir, struct path *path, int force)
+{
+ int err;
+ struct unlink_args args = {
+ .errp = &err,
+ .dir = dir,
+ .path = path
+ };
+
+ if (!force)
+ call_unlink(&args);
+ else {
+ int wkq_err;
+
+ wkq_err = au_wkq_wait(call_unlink, &args);
+ if (unlikely(wkq_err))
+ err = wkq_err;
+ }
+
+ return err;
+}
diff -urN a/fs/aufs/vfsub.h b/fs/aufs/vfsub.h
--- a/fs/aufs/vfsub.h 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/vfsub.h 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,232 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * sub-routines for VFS
+ */
+
+#ifndef __AUFS_VFSUB_H__
+#define __AUFS_VFSUB_H__
+
+#ifdef __KERNEL__
+
+#include <linux/fs.h>
+#include <linux/lglock.h>
+#include "debug.h"
+
+/* copied from linux/fs/internal.h */
+/* todo: BAD approach!! */
+DECLARE_BRLOCK(vfsmount_lock);
+extern void file_sb_list_del(struct file *f);
+extern spinlock_t inode_sb_list_lock;
+
+/* copied from linux/fs/file_table.c */
+DECLARE_LGLOCK(files_lglock);
+#ifdef CONFIG_SMP
+/*
+ * These macros iterate all files on all CPUs for a given superblock.
+ * files_lglock must be held globally.
+ */
+#define do_file_list_for_each_entry(__sb, __file) \
+{ \
+ int i; \
+ for_each_possible_cpu(i) { \
+ struct list_head *list; \
+ list = per_cpu_ptr((__sb)->s_files, i); \
+ list_for_each_entry((__file), list, f_u.fu_list)
+
+#define while_file_list_for_each_entry \
+ } \
+}
+
+#else
+
+#define do_file_list_for_each_entry(__sb, __file) \
+{ \
+ struct list_head *list; \
+ list = &(sb)->s_files; \
+ list_for_each_entry((__file), list, f_u.fu_list)
+
+#define while_file_list_for_each_entry \
+}
+#endif
+
+/* ---------------------------------------------------------------------- */
+
+/* lock subclass for lower inode */
+/* default MAX_LOCKDEP_SUBCLASSES(8) is not enough */
+/* reduce? gave up. */
+enum {
+ AuLsc_I_Begin = I_MUTEX_QUOTA, /* 4 */
+ AuLsc_I_PARENT, /* lower inode, parent first */
+ AuLsc_I_PARENT2, /* copyup dirs */
+ AuLsc_I_PARENT3, /* copyup wh */
+ AuLsc_I_CHILD,
+ AuLsc_I_CHILD2,
+ AuLsc_I_End
+};
+
+/* to debug easier, do not make them inlined functions */
+#define MtxMustLock(mtx) AuDebugOn(!mutex_is_locked(mtx))
+#define IMustLock(i) MtxMustLock(&(i)->i_mutex)
+
+/* ---------------------------------------------------------------------- */
+
+static inline void vfsub_drop_nlink(struct inode *inode)
+{
+ AuDebugOn(!inode->i_nlink);
+ drop_nlink(inode);
+}
+
+static inline void vfsub_dead_dir(struct inode *inode)
+{
+ AuDebugOn(!S_ISDIR(inode->i_mode));
+ inode->i_flags |= S_DEAD;
+ clear_nlink(inode);
+}
+
+/* ---------------------------------------------------------------------- */
+
+int vfsub_update_h_iattr(struct path *h_path, int *did);
+struct file *vfsub_dentry_open(struct path *path, int flags);
+struct file *vfsub_filp_open(const char *path, int oflags, int mode);
+int vfsub_kern_path(const char *name, unsigned int flags, struct path *path);
+struct dentry *vfsub_lookup_one_len(const char *name, struct dentry *parent,
+ int len);
+struct dentry *vfsub_lookup_hash(struct nameidata *nd);
+int vfsub_name_hash(const char *name, struct qstr *this, int len);
+
+/* ---------------------------------------------------------------------- */
+
+struct au_hinode;
+struct dentry *vfsub_lock_rename(struct dentry *d1, struct au_hinode *hdir1,
+ struct dentry *d2, struct au_hinode *hdir2);
+void vfsub_unlock_rename(struct dentry *d1, struct au_hinode *hdir1,
+ struct dentry *d2, struct au_hinode *hdir2);
+
+int vfsub_create(struct inode *dir, struct path *path, int mode);
+int vfsub_symlink(struct inode *dir, struct path *path,
+ const char *symname);
+int vfsub_mknod(struct inode *dir, struct path *path, int mode, dev_t dev);
+int vfsub_link(struct dentry *src_dentry, struct inode *dir,
+ struct path *path);
+int vfsub_rename(struct inode *src_hdir, struct dentry *src_dentry,
+ struct inode *hdir, struct path *path);
+int vfsub_mkdir(struct inode *dir, struct path *path, int mode);
+int vfsub_rmdir(struct inode *dir, struct path *path);
+
+/* ---------------------------------------------------------------------- */
+
+ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count,
+ loff_t *ppos);
+ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count,
+ loff_t *ppos);
+ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count,
+ loff_t *ppos);
+ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count,
+ loff_t *ppos);
+int vfsub_flush(struct file *file, fl_owner_t id);
+int vfsub_readdir(struct file *file, filldir_t filldir, void *arg);
+
+static inline unsigned int vfsub_file_flags(struct file *file)
+{
+ unsigned int flags;
+
+ spin_lock(&file->f_lock);
+ flags = file->f_flags;
+ spin_unlock(&file->f_lock);
+
+ return flags;
+}
+
+static inline void vfsub_file_accessed(struct file *h_file)
+{
+ file_accessed(h_file);
+ vfsub_update_h_iattr(&h_file->f_path, /*did*/NULL); /*ignore*/
+}
+
+static inline void vfsub_touch_atime(struct vfsmount *h_mnt,
+ struct dentry *h_dentry)
+{
+ struct path h_path = {
+ .dentry = h_dentry,
+ .mnt = h_mnt
+ };
+ touch_atime(h_mnt, h_dentry);
+ vfsub_update_h_iattr(&h_path, /*did*/NULL); /*ignore*/
+}
+
+long vfsub_splice_to(struct file *in, loff_t *ppos,
+ struct pipe_inode_info *pipe, size_t len,
+ unsigned int flags);
+long vfsub_splice_from(struct pipe_inode_info *pipe, struct file *out,
+ loff_t *ppos, size_t len, unsigned int flags);
+int vfsub_trunc(struct path *h_path, loff_t length, unsigned int attr,
+ struct file *h_file);
+int vfsub_fsync(struct file *file, struct path *path, int datasync);
+
+/* ---------------------------------------------------------------------- */
+
+static inline loff_t vfsub_llseek(struct file *file, loff_t offset, int origin)
+{
+ loff_t err;
+
+ lockdep_off();
+ err = vfs_llseek(file, offset, origin);
+ lockdep_on();
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* dirty workaround for strict type of fmode_t */
+union vfsub_fmu {
+ fmode_t fm;
+ unsigned int ui;
+};
+
+static inline unsigned int vfsub_fmode_to_uint(fmode_t fm)
+{
+ union vfsub_fmu u = {
+ .fm = fm
+ };
+
+ BUILD_BUG_ON(sizeof(u.fm) != sizeof(u.ui));
+
+ return u.ui;
+}
+
+static inline fmode_t vfsub_uint_to_fmode(unsigned int ui)
+{
+ union vfsub_fmu u = {
+ .ui = ui
+ };
+
+ return u.fm;
+}
+
+/* ---------------------------------------------------------------------- */
+
+int vfsub_sio_mkdir(struct inode *dir, struct path *path, int mode);
+int vfsub_sio_rmdir(struct inode *dir, struct path *path);
+int vfsub_sio_notify_change(struct path *path, struct iattr *ia);
+int vfsub_notify_change(struct path *path, struct iattr *ia);
+int vfsub_unlink(struct inode *dir, struct path *path, int force);
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_VFSUB_H__ */
diff -urN a/fs/aufs/wbr_policy.c b/fs/aufs/wbr_policy.c
--- a/fs/aufs/wbr_policy.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/wbr_policy.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,700 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * policies for selecting one among multiple writable branches
+ */
+
+#include <linux/statfs.h>
+#include "aufs.h"
+
+/* subset of cpup_attr() */
+static noinline_for_stack
+int au_cpdown_attr(struct path *h_path, struct dentry *h_src)
+{
+ int err, sbits;
+ struct iattr ia;
+ struct inode *h_isrc;
+
+ h_isrc = h_src->d_inode;
+ ia.ia_valid = ATTR_FORCE | ATTR_MODE | ATTR_UID | ATTR_GID;
+ ia.ia_mode = h_isrc->i_mode;
+ ia.ia_uid = h_isrc->i_uid;
+ ia.ia_gid = h_isrc->i_gid;
+ sbits = !!(ia.ia_mode & (S_ISUID | S_ISGID));
+ au_cpup_attr_flags(h_path->dentry->d_inode, h_isrc);
+ err = vfsub_sio_notify_change(h_path, &ia);
+
+ /* is this nfs only? */
+ if (!err && sbits && au_test_nfs(h_path->dentry->d_sb)) {
+ ia.ia_valid = ATTR_FORCE | ATTR_MODE;
+ ia.ia_mode = h_isrc->i_mode;
+ err = vfsub_sio_notify_change(h_path, &ia);
+ }
+
+ return err;
+}
+
+#define AuCpdown_PARENT_OPQ 1
+#define AuCpdown_WHED (1 << 1)
+#define AuCpdown_MADE_DIR (1 << 2)
+#define AuCpdown_DIROPQ (1 << 3)
+#define au_ftest_cpdown(flags, name) ((flags) & AuCpdown_##name)
+#define au_fset_cpdown(flags, name) \
+ do { (flags) |= AuCpdown_##name; } while (0)
+#define au_fclr_cpdown(flags, name) \
+ do { (flags) &= ~AuCpdown_##name; } while (0)
+
+struct au_cpdown_dir_args {
+ struct dentry *parent;
+ unsigned int flags;
+};
+
+static int au_cpdown_dir_opq(struct dentry *dentry, aufs_bindex_t bdst,
+ struct au_cpdown_dir_args *a)
+{
+ int err;
+ struct dentry *opq_dentry;
+
+ opq_dentry = au_diropq_create(dentry, bdst);
+ err = PTR_ERR(opq_dentry);
+ if (IS_ERR(opq_dentry))
+ goto out;
+ dput(opq_dentry);
+ au_fset_cpdown(a->flags, DIROPQ);
+
+out:
+ return err;
+}
+
+static int au_cpdown_dir_wh(struct dentry *dentry, struct dentry *h_parent,
+ struct inode *dir, aufs_bindex_t bdst)
+{
+ int err;
+ struct path h_path;
+ struct au_branch *br;
+
+ br = au_sbr(dentry->d_sb, bdst);
+ h_path.dentry = au_wh_lkup(h_parent, &dentry->d_name, br);
+ err = PTR_ERR(h_path.dentry);
+ if (IS_ERR(h_path.dentry))
+ goto out;
+
+ err = 0;
+ if (h_path.dentry->d_inode) {
+ h_path.mnt = br->br_mnt;
+ err = au_wh_unlink_dentry(au_h_iptr(dir, bdst), &h_path,
+ dentry);
+ }
+ dput(h_path.dentry);
+
+out:
+ return err;
+}
+
+static int au_cpdown_dir(struct dentry *dentry, aufs_bindex_t bdst,
+ struct dentry *h_parent, void *arg)
+{
+ int err, rerr;
+ aufs_bindex_t bopq, bstart;
+ struct path h_path;
+ struct dentry *parent;
+ struct inode *h_dir, *h_inode, *inode, *dir;
+ struct au_cpdown_dir_args *args = arg;
+
+ bstart = au_dbstart(dentry);
+ /* dentry is di-locked */
+ parent = dget_parent(dentry);
+ dir = parent->d_inode;
+ h_dir = h_parent->d_inode;
+ AuDebugOn(h_dir != au_h_iptr(dir, bdst));
+ IMustLock(h_dir);
+
+ err = au_lkup_neg(dentry, bdst);
+ if (unlikely(err < 0))
+ goto out;
+ h_path.dentry = au_h_dptr(dentry, bdst);
+ h_path.mnt = au_sbr_mnt(dentry->d_sb, bdst);
+ err = vfsub_sio_mkdir(au_h_iptr(dir, bdst), &h_path,
+ S_IRWXU | S_IRUGO | S_IXUGO);
+ if (unlikely(err))
+ goto out_put;
+ au_fset_cpdown(args->flags, MADE_DIR);
+
+ bopq = au_dbdiropq(dentry);
+ au_fclr_cpdown(args->flags, WHED);
+ au_fclr_cpdown(args->flags, DIROPQ);
+ if (au_dbwh(dentry) == bdst)
+ au_fset_cpdown(args->flags, WHED);
+ if (!au_ftest_cpdown(args->flags, PARENT_OPQ) && bopq <= bdst)
+ au_fset_cpdown(args->flags, PARENT_OPQ);
+ h_inode = h_path.dentry->d_inode;
+ mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
+ if (au_ftest_cpdown(args->flags, WHED)) {
+ err = au_cpdown_dir_opq(dentry, bdst, args);
+ if (unlikely(err)) {
+ mutex_unlock(&h_inode->i_mutex);
+ goto out_dir;
+ }
+ }
+
+ err = au_cpdown_attr(&h_path, au_h_dptr(dentry, bstart));
+ mutex_unlock(&h_inode->i_mutex);
+ if (unlikely(err))
+ goto out_opq;
+
+ if (au_ftest_cpdown(args->flags, WHED)) {
+ err = au_cpdown_dir_wh(dentry, h_parent, dir, bdst);
+ if (unlikely(err))
+ goto out_opq;
+ }
+
+ inode = dentry->d_inode;
+ if (au_ibend(inode) < bdst)
+ au_set_ibend(inode, bdst);
+ au_set_h_iptr(inode, bdst, au_igrab(h_inode),
+ au_hi_flags(inode, /*isdir*/1));
+ goto out; /* success */
+
+ /* revert */
+out_opq:
+ if (au_ftest_cpdown(args->flags, DIROPQ)) {
+ mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
+ rerr = au_diropq_remove(dentry, bdst);
+ mutex_unlock(&h_inode->i_mutex);
+ if (unlikely(rerr)) {
+ AuIOErr("failed removing diropq for %.*s b%d (%d)\n",
+ AuDLNPair(dentry), bdst, rerr);
+ err = -EIO;
+ goto out;
+ }
+ }
+out_dir:
+ if (au_ftest_cpdown(args->flags, MADE_DIR)) {
+ rerr = vfsub_sio_rmdir(au_h_iptr(dir, bdst), &h_path);
+ if (unlikely(rerr)) {
+ AuIOErr("failed removing %.*s b%d (%d)\n",
+ AuDLNPair(dentry), bdst, rerr);
+ err = -EIO;
+ }
+ }
+out_put:
+ au_set_h_dptr(dentry, bdst, NULL);
+ if (au_dbend(dentry) == bdst)
+ au_update_dbend(dentry);
+out:
+ dput(parent);
+ return err;
+}
+
+int au_cpdown_dirs(struct dentry *dentry, aufs_bindex_t bdst)
+{
+ int err;
+ struct au_cpdown_dir_args args = {
+ .parent = dget_parent(dentry),
+ .flags = 0
+ };
+
+ err = au_cp_dirs(dentry, bdst, au_cpdown_dir, &args);
+ dput(args.parent);
+
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* policies for create */
+
+static int au_wbr_nonopq(struct dentry *dentry, aufs_bindex_t bindex)
+{
+ int err, i, j, ndentry;
+ aufs_bindex_t bopq;
+ struct au_dcsub_pages dpages;
+ struct au_dpage *dpage;
+ struct dentry **dentries, *parent, *d;
+
+ err = au_dpages_init(&dpages, GFP_NOFS);
+ if (unlikely(err))
+ goto out;
+ parent = dget_parent(dentry);
+ err = au_dcsub_pages_rev_aufs(&dpages, parent, /*do_include*/0);
+ if (unlikely(err))
+ goto out_free;
+
+ err = bindex;
+ for (i = 0; i < dpages.ndpage; i++) {
+ dpage = dpages.dpages + i;
+ dentries = dpage->dentries;
+ ndentry = dpage->ndentry;
+ for (j = 0; j < ndentry; j++) {
+ d = dentries[j];
+ di_read_lock_parent2(d, !AuLock_IR);
+ bopq = au_dbdiropq(d);
+ di_read_unlock(d, !AuLock_IR);
+ if (bopq >= 0 && bopq < err)
+ err = bopq;
+ }
+ }
+
+out_free:
+ dput(parent);
+ au_dpages_free(&dpages);
+out:
+ return err;
+}
+
+static int au_wbr_bu(struct super_block *sb, aufs_bindex_t bindex)
+{
+ for (; bindex >= 0; bindex--)
+ if (!au_br_rdonly(au_sbr(sb, bindex)))
+ return bindex;
+ return -EROFS;
+}
+
+/* top down parent */
+static int au_wbr_create_tdp(struct dentry *dentry, int isdir __maybe_unused)
+{
+ int err;
+ aufs_bindex_t bstart, bindex;
+ struct super_block *sb;
+ struct dentry *parent, *h_parent;
+
+ sb = dentry->d_sb;
+ bstart = au_dbstart(dentry);
+ err = bstart;
+ if (!au_br_rdonly(au_sbr(sb, bstart)))
+ goto out;
+
+ err = -EROFS;
+ parent = dget_parent(dentry);
+ for (bindex = au_dbstart(parent); bindex < bstart; bindex++) {
+ h_parent = au_h_dptr(parent, bindex);
+ if (!h_parent || !h_parent->d_inode)
+ continue;
+
+ if (!au_br_rdonly(au_sbr(sb, bindex))) {
+ err = bindex;
+ break;
+ }
+ }
+ dput(parent);
+
+ /* bottom up here */
+ if (unlikely(err < 0)) {
+ err = au_wbr_bu(sb, bstart - 1);
+ if (err >= 0)
+ err = au_wbr_nonopq(dentry, err);
+ }
+
+out:
+ AuDbg("b%d\n", err);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* an exception for the policy other than tdp */
+static int au_wbr_create_exp(struct dentry *dentry)
+{
+ int err;
+ aufs_bindex_t bwh, bdiropq;
+ struct dentry *parent;
+
+ err = -1;
+ bwh = au_dbwh(dentry);
+ parent = dget_parent(dentry);
+ bdiropq = au_dbdiropq(parent);
+ if (bwh >= 0) {
+ if (bdiropq >= 0)
+ err = min(bdiropq, bwh);
+ else
+ err = bwh;
+ AuDbg("%d\n", err);
+ } else if (bdiropq >= 0) {
+ err = bdiropq;
+ AuDbg("%d\n", err);
+ }
+ dput(parent);
+
+ if (err >= 0)
+ err = au_wbr_nonopq(dentry, err);
+
+ if (err >= 0 && au_br_rdonly(au_sbr(dentry->d_sb, err)))
+ err = -1;
+
+ AuDbg("%d\n", err);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* round robin */
+static int au_wbr_create_init_rr(struct super_block *sb)
+{
+ int err;
+
+ err = au_wbr_bu(sb, au_sbend(sb));
+ atomic_set(&au_sbi(sb)->si_wbr_rr_next, -err); /* less important */
+ /* smp_mb(); */
+
+ AuDbg("b%d\n", err);
+ return err;
+}
+
+static int au_wbr_create_rr(struct dentry *dentry, int isdir)
+{
+ int err, nbr;
+ unsigned int u;
+ aufs_bindex_t bindex, bend;
+ struct super_block *sb;
+ atomic_t *next;
+
+ err = au_wbr_create_exp(dentry);
+ if (err >= 0)
+ goto out;
+
+ sb = dentry->d_sb;
+ next = &au_sbi(sb)->si_wbr_rr_next;
+ bend = au_sbend(sb);
+ nbr = bend + 1;
+ for (bindex = 0; bindex <= bend; bindex++) {
+ if (!isdir) {
+ err = atomic_dec_return(next) + 1;
+ /* modulo for 0 is meaningless */
+ if (unlikely(!err))
+ err = atomic_dec_return(next) + 1;
+ } else
+ err = atomic_read(next);
+ AuDbg("%d\n", err);
+ u = err;
+ err = u % nbr;
+ AuDbg("%d\n", err);
+ if (!au_br_rdonly(au_sbr(sb, err)))
+ break;
+ err = -EROFS;
+ }
+
+ if (err >= 0)
+ err = au_wbr_nonopq(dentry, err);
+
+out:
+ AuDbg("%d\n", err);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* most free space */
+static void au_mfs(struct dentry *dentry)
+{
+ struct super_block *sb;
+ struct au_branch *br;
+ struct au_wbr_mfs *mfs;
+ aufs_bindex_t bindex, bend;
+ int err;
+ unsigned long long b, bavail;
+ struct path h_path;
+ /* reduce the stack usage */
+ struct kstatfs *st;
+
+ st = kmalloc(sizeof(*st), GFP_NOFS);
+ if (unlikely(!st)) {
+ AuWarn1("failed updating mfs(%d), ignored\n", -ENOMEM);
+ return;
+ }
+
+ bavail = 0;
+ sb = dentry->d_sb;
+ mfs = &au_sbi(sb)->si_wbr_mfs;
+ MtxMustLock(&mfs->mfs_lock);
+ mfs->mfs_bindex = -EROFS;
+ mfs->mfsrr_bytes = 0;
+ bend = au_sbend(sb);
+ for (bindex = 0; bindex <= bend; bindex++) {
+ br = au_sbr(sb, bindex);
+ if (au_br_rdonly(br))
+ continue;
+
+ /* sb->s_root for NFS is unreliable */
+ h_path.mnt = br->br_mnt;
+ h_path.dentry = h_path.mnt->mnt_root;
+ err = vfs_statfs(&h_path, st);
+ if (unlikely(err)) {
+ AuWarn1("failed statfs, b%d, %d\n", bindex, err);
+ continue;
+ }
+
+ /* when the available size is equal, select the lower one */
+ BUILD_BUG_ON(sizeof(b) < sizeof(st->f_bavail)
+ || sizeof(b) < sizeof(st->f_bsize));
+ b = st->f_bavail * st->f_bsize;
+ br->br_wbr->wbr_bytes = b;
+ if (b >= bavail) {
+ bavail = b;
+ mfs->mfs_bindex = bindex;
+ mfs->mfs_jiffy = jiffies;
+ }
+ }
+
+ mfs->mfsrr_bytes = bavail;
+ AuDbg("b%d\n", mfs->mfs_bindex);
+ kfree(st);
+}
+
+static int au_wbr_create_mfs(struct dentry *dentry, int isdir __maybe_unused)
+{
+ int err;
+ struct super_block *sb;
+ struct au_wbr_mfs *mfs;
+
+ err = au_wbr_create_exp(dentry);
+ if (err >= 0)
+ goto out;
+
+ sb = dentry->d_sb;
+ mfs = &au_sbi(sb)->si_wbr_mfs;
+ mutex_lock(&mfs->mfs_lock);
+ if (time_after(jiffies, mfs->mfs_jiffy + mfs->mfs_expire)
+ || mfs->mfs_bindex < 0
+ || au_br_rdonly(au_sbr(sb, mfs->mfs_bindex)))
+ au_mfs(dentry);
+ mutex_unlock(&mfs->mfs_lock);
+ err = mfs->mfs_bindex;
+
+ if (err >= 0)
+ err = au_wbr_nonopq(dentry, err);
+
+out:
+ AuDbg("b%d\n", err);
+ return err;
+}
+
+static int au_wbr_create_init_mfs(struct super_block *sb)
+{
+ struct au_wbr_mfs *mfs;
+
+ mfs = &au_sbi(sb)->si_wbr_mfs;
+ mutex_init(&mfs->mfs_lock);
+ mfs->mfs_jiffy = 0;
+ mfs->mfs_bindex = -EROFS;
+
+ return 0;
+}
+
+static int au_wbr_create_fin_mfs(struct super_block *sb __maybe_unused)
+{
+ mutex_destroy(&au_sbi(sb)->si_wbr_mfs.mfs_lock);
+ return 0;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* most free space and then round robin */
+static int au_wbr_create_mfsrr(struct dentry *dentry, int isdir)
+{
+ int err;
+ struct au_wbr_mfs *mfs;
+
+ err = au_wbr_create_mfs(dentry, isdir);
+ if (err >= 0) {
+ mfs = &au_sbi(dentry->d_sb)->si_wbr_mfs;
+ mutex_lock(&mfs->mfs_lock);
+ if (mfs->mfsrr_bytes < mfs->mfsrr_watermark)
+ err = au_wbr_create_rr(dentry, isdir);
+ mutex_unlock(&mfs->mfs_lock);
+ }
+
+ AuDbg("b%d\n", err);
+ return err;
+}
+
+static int au_wbr_create_init_mfsrr(struct super_block *sb)
+{
+ int err;
+
+ au_wbr_create_init_mfs(sb); /* ignore */
+ err = au_wbr_create_init_rr(sb);
+
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* top down parent and most free space */
+static int au_wbr_create_pmfs(struct dentry *dentry, int isdir)
+{
+ int err, e2;
+ unsigned long long b;
+ aufs_bindex_t bindex, bstart, bend;
+ struct super_block *sb;
+ struct dentry *parent, *h_parent;
+ struct au_branch *br;
+
+ err = au_wbr_create_tdp(dentry, isdir);
+ if (unlikely(err < 0))
+ goto out;
+ parent = dget_parent(dentry);
+ bstart = au_dbstart(parent);
+ bend = au_dbtaildir(parent);
+ if (bstart == bend)
+ goto out_parent; /* success */
+
+ e2 = au_wbr_create_mfs(dentry, isdir);
+ if (e2 < 0)
+ goto out_parent; /* success */
+
+ /* when the available size is equal, select upper one */
+ sb = dentry->d_sb;
+ br = au_sbr(sb, err);
+ b = br->br_wbr->wbr_bytes;
+ AuDbg("b%d, %llu\n", err, b);
+
+ for (bindex = bstart; bindex <= bend; bindex++) {
+ h_parent = au_h_dptr(parent, bindex);
+ if (!h_parent || !h_parent->d_inode)
+ continue;
+
+ br = au_sbr(sb, bindex);
+ if (!au_br_rdonly(br) && br->br_wbr->wbr_bytes > b) {
+ b = br->br_wbr->wbr_bytes;
+ err = bindex;
+ AuDbg("b%d, %llu\n", err, b);
+ }
+ }
+
+ if (err >= 0)
+ err = au_wbr_nonopq(dentry, err);
+
+out_parent:
+ dput(parent);
+out:
+ AuDbg("b%d\n", err);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* policies for copyup */
+
+/* top down parent */
+static int au_wbr_copyup_tdp(struct dentry *dentry)
+{
+ return au_wbr_create_tdp(dentry, /*isdir, anything is ok*/0);
+}
+
+/* bottom up parent */
+static int au_wbr_copyup_bup(struct dentry *dentry)
+{
+ int err;
+ aufs_bindex_t bindex, bstart;
+ struct dentry *parent, *h_parent;
+ struct super_block *sb;
+
+ err = -EROFS;
+ sb = dentry->d_sb;
+ parent = dget_parent(dentry);
+ bstart = au_dbstart(parent);
+ for (bindex = au_dbstart(dentry); bindex >= bstart; bindex--) {
+ h_parent = au_h_dptr(parent, bindex);
+ if (!h_parent || !h_parent->d_inode)
+ continue;
+
+ if (!au_br_rdonly(au_sbr(sb, bindex))) {
+ err = bindex;
+ break;
+ }
+ }
+ dput(parent);
+
+ /* bottom up here */
+ if (unlikely(err < 0))
+ err = au_wbr_bu(sb, bstart - 1);
+
+ AuDbg("b%d\n", err);
+ return err;
+}
+
+/* bottom up */
+static int au_wbr_copyup_bu(struct dentry *dentry)
+{
+ int err;
+ aufs_bindex_t bstart;
+
+ bstart = au_dbstart(dentry);
+ err = au_wbr_bu(dentry->d_sb, bstart);
+ AuDbg("b%d\n", err);
+ if (err > bstart)
+ err = au_wbr_nonopq(dentry, err);
+
+ AuDbg("b%d\n", err);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct au_wbr_copyup_operations au_wbr_copyup_ops[] = {
+ [AuWbrCopyup_TDP] = {
+ .copyup = au_wbr_copyup_tdp
+ },
+ [AuWbrCopyup_BUP] = {
+ .copyup = au_wbr_copyup_bup
+ },
+ [AuWbrCopyup_BU] = {
+ .copyup = au_wbr_copyup_bu
+ }
+};
+
+struct au_wbr_create_operations au_wbr_create_ops[] = {
+ [AuWbrCreate_TDP] = {
+ .create = au_wbr_create_tdp
+ },
+ [AuWbrCreate_RR] = {
+ .create = au_wbr_create_rr,
+ .init = au_wbr_create_init_rr
+ },
+ [AuWbrCreate_MFS] = {
+ .create = au_wbr_create_mfs,
+ .init = au_wbr_create_init_mfs,
+ .fin = au_wbr_create_fin_mfs
+ },
+ [AuWbrCreate_MFSV] = {
+ .create = au_wbr_create_mfs,
+ .init = au_wbr_create_init_mfs,
+ .fin = au_wbr_create_fin_mfs
+ },
+ [AuWbrCreate_MFSRR] = {
+ .create = au_wbr_create_mfsrr,
+ .init = au_wbr_create_init_mfsrr,
+ .fin = au_wbr_create_fin_mfs
+ },
+ [AuWbrCreate_MFSRRV] = {
+ .create = au_wbr_create_mfsrr,
+ .init = au_wbr_create_init_mfsrr,
+ .fin = au_wbr_create_fin_mfs
+ },
+ [AuWbrCreate_PMFS] = {
+ .create = au_wbr_create_pmfs,
+ .init = au_wbr_create_init_mfs,
+ .fin = au_wbr_create_fin_mfs
+ },
+ [AuWbrCreate_PMFSV] = {
+ .create = au_wbr_create_pmfs,
+ .init = au_wbr_create_init_mfs,
+ .fin = au_wbr_create_fin_mfs
+ }
+};
diff -urN a/fs/aufs/whout.c b/fs/aufs/whout.c
--- a/fs/aufs/whout.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/whout.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,1049 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * whiteout for logical deletion and opaque directory
+ */
+
+#include "aufs.h"
+
+#define WH_MASK S_IRUGO
+
+/*
+ * If a directory contains this file, then it is opaque. We start with the
+ * .wh. flag so that it is blocked by lookup.
+ */
+static struct qstr diropq_name = {
+ .name = AUFS_WH_DIROPQ,
+ .len = sizeof(AUFS_WH_DIROPQ) - 1
+};
+
+/*
+ * generate whiteout name, which is NOT terminated by NULL.
+ * @name: original d_name.name
+ * @len: original d_name.len
+ * @wh: whiteout qstr
+ * returns zero when succeeds, otherwise error.
+ * succeeded value as wh->name should be freed by kfree().
+ */
+int au_wh_name_alloc(struct qstr *wh, const struct qstr *name)
+{
+ char *p;
+
+ if (unlikely(name->len > PATH_MAX - AUFS_WH_PFX_LEN))
+ return -ENAMETOOLONG;
+
+ wh->len = name->len + AUFS_WH_PFX_LEN;
+ p = kmalloc(wh->len, GFP_NOFS);
+ wh->name = p;
+ if (p) {
+ memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN);
+ memcpy(p + AUFS_WH_PFX_LEN, name->name, name->len);
+ /* smp_mb(); */
+ return 0;
+ }
+ return -ENOMEM;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * test if the @wh_name exists under @h_parent.
+ * @try_sio specifies the necessary of super-io.
+ */
+int au_wh_test(struct dentry *h_parent, struct qstr *wh_name,
+ struct au_branch *br, int try_sio)
+{
+ int err;
+ struct dentry *wh_dentry;
+
+ if (!try_sio)
+ wh_dentry = au_lkup_one(wh_name, h_parent, br, /*nd*/NULL);
+ else
+ wh_dentry = au_sio_lkup_one(wh_name, h_parent, br);
+ err = PTR_ERR(wh_dentry);
+ if (IS_ERR(wh_dentry))
+ goto out;
+
+ err = 0;
+ if (!wh_dentry->d_inode)
+ goto out_wh; /* success */
+
+ err = 1;
+ if (S_ISREG(wh_dentry->d_inode->i_mode))
+ goto out_wh; /* success */
+
+ err = -EIO;
+ AuIOErr("%.*s Invalid whiteout entry type 0%o.\n",
+ AuDLNPair(wh_dentry), wh_dentry->d_inode->i_mode);
+
+out_wh:
+ dput(wh_dentry);
+out:
+ return err;
+}
+
+/*
+ * test if the @h_dentry sets opaque or not.
+ */
+int au_diropq_test(struct dentry *h_dentry, struct au_branch *br)
+{
+ int err;
+ struct inode *h_dir;
+
+ h_dir = h_dentry->d_inode;
+ err = au_wh_test(h_dentry, &diropq_name, br,
+ au_test_h_perm_sio(h_dir, MAY_EXEC));
+ return err;
+}
+
+/*
+ * returns a negative dentry whose name is unique and temporary.
+ */
+struct dentry *au_whtmp_lkup(struct dentry *h_parent, struct au_branch *br,
+ struct qstr *prefix)
+{
+ struct dentry *dentry;
+ int i;
+ char defname[NAME_MAX - AUFS_MAX_NAMELEN + DNAME_INLINE_LEN + 1],
+ *name, *p;
+ /* strict atomic_t is unnecessary here */
+ static unsigned short cnt;
+ struct qstr qs;
+
+ BUILD_BUG_ON(sizeof(cnt) * 2 > AUFS_WH_TMP_LEN);
+
+ name = defname;
+ qs.len = sizeof(defname) - DNAME_INLINE_LEN + prefix->len - 1;
+ if (unlikely(prefix->len > DNAME_INLINE_LEN)) {
+ dentry = ERR_PTR(-ENAMETOOLONG);
+ if (unlikely(qs.len > NAME_MAX))
+ goto out;
+ dentry = ERR_PTR(-ENOMEM);
+ name = kmalloc(qs.len + 1, GFP_NOFS);
+ if (unlikely(!name))
+ goto out;
+ }
+
+ /* doubly whiteout-ed */
+ memcpy(name, AUFS_WH_PFX AUFS_WH_PFX, AUFS_WH_PFX_LEN * 2);
+ p = name + AUFS_WH_PFX_LEN * 2;
+ memcpy(p, prefix->name, prefix->len);
+ p += prefix->len;
+ *p++ = '.';
+ AuDebugOn(name + qs.len + 1 - p <= AUFS_WH_TMP_LEN);
+
+ qs.name = name;
+ for (i = 0; i < 3; i++) {
+ sprintf(p, "%.*x", AUFS_WH_TMP_LEN, cnt++);
+ dentry = au_sio_lkup_one(&qs, h_parent, br);
+ if (IS_ERR(dentry) || !dentry->d_inode)
+ goto out_name;
+ dput(dentry);
+ }
+ /* pr_warning("could not get random name\n"); */
+ dentry = ERR_PTR(-EEXIST);
+ AuDbg("%.*s\n", AuLNPair(&qs));
+ BUG();
+
+out_name:
+ if (name != defname)
+ kfree(name);
+out:
+ AuTraceErrPtr(dentry);
+ return dentry;
+}
+
+/*
+ * rename the @h_dentry on @br to the whiteouted temporary name.
+ */
+int au_whtmp_ren(struct dentry *h_dentry, struct au_branch *br)
+{
+ int err;
+ struct path h_path = {
+ .mnt = br->br_mnt
+ };
+ struct inode *h_dir;
+ struct dentry *h_parent;
+
+ h_parent = h_dentry->d_parent; /* dir inode is locked */
+ h_dir = h_parent->d_inode;
+ IMustLock(h_dir);
+
+ h_path.dentry = au_whtmp_lkup(h_parent, br, &h_dentry->d_name);
+ err = PTR_ERR(h_path.dentry);
+ if (IS_ERR(h_path.dentry))
+ goto out;
+
+ /* under the same dir, no need to lock_rename() */
+ err = vfsub_rename(h_dir, h_dentry, h_dir, &h_path);
+ AuTraceErr(err);
+ dput(h_path.dentry);
+
+out:
+ AuTraceErr(err);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+/*
+ * functions for removing a whiteout
+ */
+
+static int do_unlink_wh(struct inode *h_dir, struct path *h_path)
+{
+ int force;
+
+ /*
+ * forces superio when the dir has a sticky bit.
+ * this may be a violation of unix fs semantics.
+ */
+ force = (h_dir->i_mode & S_ISVTX)
+ && h_path->dentry->d_inode->i_uid != current_fsuid();
+ return vfsub_unlink(h_dir, h_path, force);
+}
+
+int au_wh_unlink_dentry(struct inode *h_dir, struct path *h_path,
+ struct dentry *dentry)
+{
+ int err;
+
+ err = do_unlink_wh(h_dir, h_path);
+ if (!err && dentry)
+ au_set_dbwh(dentry, -1);
+
+ return err;
+}
+
+static int unlink_wh_name(struct dentry *h_parent, struct qstr *wh,
+ struct au_branch *br)
+{
+ int err;
+ struct path h_path = {
+ .mnt = br->br_mnt
+ };
+
+ err = 0;
+ h_path.dentry = au_lkup_one(wh, h_parent, br, /*nd*/NULL);
+ if (IS_ERR(h_path.dentry))
+ err = PTR_ERR(h_path.dentry);
+ else {
+ if (h_path.dentry->d_inode
+ && S_ISREG(h_path.dentry->d_inode->i_mode))
+ err = do_unlink_wh(h_parent->d_inode, &h_path);
+ dput(h_path.dentry);
+ }
+
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+/*
+ * initialize/clean whiteout for a branch
+ */
+
+static void au_wh_clean(struct inode *h_dir, struct path *whpath,
+ const int isdir)
+{
+ int err;
+
+ if (!whpath->dentry->d_inode)
+ return;
+
+ err = mnt_want_write(whpath->mnt);
+ if (!err) {
+ if (isdir)
+ err = vfsub_rmdir(h_dir, whpath);
+ else
+ err = vfsub_unlink(h_dir, whpath, /*force*/0);
+ mnt_drop_write(whpath->mnt);
+ }
+ if (unlikely(err))
+ pr_warning("failed removing %.*s (%d), ignored.\n",
+ AuDLNPair(whpath->dentry), err);
+}
+
+static int test_linkable(struct dentry *h_root)
+{
+ struct inode *h_dir = h_root->d_inode;
+
+ if (h_dir->i_op->link)
+ return 0;
+
+ pr_err("%.*s (%s) doesn't support link(2), use noplink and rw+nolwh\n",
+ AuDLNPair(h_root), au_sbtype(h_root->d_sb));
+ return -ENOSYS;
+}
+
+/* todo: should this mkdir be done in /sbin/mount.aufs helper? */
+static int au_whdir(struct inode *h_dir, struct path *path)
+{
+ int err;
+
+ err = -EEXIST;
+ if (!path->dentry->d_inode) {
+ int mode = S_IRWXU;
+
+ if (au_test_nfs(path->dentry->d_sb))
+ mode |= S_IXUGO;
+ err = mnt_want_write(path->mnt);
+ if (!err) {
+ err = vfsub_mkdir(h_dir, path, mode);
+ mnt_drop_write(path->mnt);
+ }
+ } else if (S_ISDIR(path->dentry->d_inode->i_mode))
+ err = 0;
+ else
+ pr_err("unknown %.*s exists\n", AuDLNPair(path->dentry));
+
+ return err;
+}
+
+struct au_wh_base {
+ const struct qstr *name;
+ struct dentry *dentry;
+};
+
+static void au_wh_init_ro(struct inode *h_dir, struct au_wh_base base[],
+ struct path *h_path)
+{
+ h_path->dentry = base[AuBrWh_BASE].dentry;
+ au_wh_clean(h_dir, h_path, /*isdir*/0);
+ h_path->dentry = base[AuBrWh_PLINK].dentry;
+ au_wh_clean(h_dir, h_path, /*isdir*/1);
+ h_path->dentry = base[AuBrWh_ORPH].dentry;
+ au_wh_clean(h_dir, h_path, /*isdir*/1);
+}
+
+/*
+ * returns tri-state,
+ * minus: error, caller should print the mesage
+ * zero: succuess
+ * plus: error, caller should NOT print the mesage
+ */
+static int au_wh_init_rw_nolink(struct dentry *h_root, struct au_wbr *wbr,
+ int do_plink, struct au_wh_base base[],
+ struct path *h_path)
+{
+ int err;
+ struct inode *h_dir;
+
+ h_dir = h_root->d_inode;
+ h_path->dentry = base[AuBrWh_BASE].dentry;
+ au_wh_clean(h_dir, h_path, /*isdir*/0);
+ h_path->dentry = base[AuBrWh_PLINK].dentry;
+ if (do_plink) {
+ err = test_linkable(h_root);
+ if (unlikely(err)) {
+ err = 1;
+ goto out;
+ }
+
+ err = au_whdir(h_dir, h_path);
+ if (unlikely(err))
+ goto out;
+ wbr->wbr_plink = dget(base[AuBrWh_PLINK].dentry);
+ } else
+ au_wh_clean(h_dir, h_path, /*isdir*/1);
+ h_path->dentry = base[AuBrWh_ORPH].dentry;
+ err = au_whdir(h_dir, h_path);
+ if (unlikely(err))
+ goto out;
+ wbr->wbr_orph = dget(base[AuBrWh_ORPH].dentry);
+
+out:
+ return err;
+}
+
+/*
+ * for the moment, aufs supports the branch filesystem which does not support
+ * link(2). testing on FAT which does not support i_op->setattr() fully either,
+ * copyup failed. finally, such filesystem will not be used as the writable
+ * branch.
+ *
+ * returns tri-state, see above.
+ */
+static int au_wh_init_rw(struct dentry *h_root, struct au_wbr *wbr,
+ int do_plink, struct au_wh_base base[],
+ struct path *h_path)
+{
+ int err;
+ struct inode *h_dir;
+
+ WbrWhMustWriteLock(wbr);
+
+ err = test_linkable(h_root);
+ if (unlikely(err)) {
+ err = 1;
+ goto out;
+ }
+
+ /*
+ * todo: should this create be done in /sbin/mount.aufs helper?
+ */
+ err = -EEXIST;
+ h_dir = h_root->d_inode;
+ if (!base[AuBrWh_BASE].dentry->d_inode) {
+ err = mnt_want_write(h_path->mnt);
+ if (!err) {
+ h_path->dentry = base[AuBrWh_BASE].dentry;
+ err = vfsub_create(h_dir, h_path, WH_MASK);
+ mnt_drop_write(h_path->mnt);
+ }
+ } else if (S_ISREG(base[AuBrWh_BASE].dentry->d_inode->i_mode))
+ err = 0;
+ else
+ pr_err("unknown %.*s/%.*s exists\n",
+ AuDLNPair(h_root), AuDLNPair(base[AuBrWh_BASE].dentry));
+ if (unlikely(err))
+ goto out;
+
+ h_path->dentry = base[AuBrWh_PLINK].dentry;
+ if (do_plink) {
+ err = au_whdir(h_dir, h_path);
+ if (unlikely(err))
+ goto out;
+ wbr->wbr_plink = dget(base[AuBrWh_PLINK].dentry);
+ } else
+ au_wh_clean(h_dir, h_path, /*isdir*/1);
+ wbr->wbr_whbase = dget(base[AuBrWh_BASE].dentry);
+
+ h_path->dentry = base[AuBrWh_ORPH].dentry;
+ err = au_whdir(h_dir, h_path);
+ if (unlikely(err))
+ goto out;
+ wbr->wbr_orph = dget(base[AuBrWh_ORPH].dentry);
+
+out:
+ return err;
+}
+
+/*
+ * initialize the whiteout base file/dir for @br.
+ */
+int au_wh_init(struct dentry *h_root, struct au_branch *br,
+ struct super_block *sb)
+{
+ int err, i;
+ const unsigned char do_plink
+ = !!au_opt_test(au_mntflags(sb), PLINK);
+ struct path path = {
+ .mnt = br->br_mnt
+ };
+ struct inode *h_dir;
+ struct au_wbr *wbr = br->br_wbr;
+ static const struct qstr base_name[] = {
+ [AuBrWh_BASE] = {
+ .name = AUFS_BASE_NAME,
+ .len = sizeof(AUFS_BASE_NAME) - 1
+ },
+ [AuBrWh_PLINK] = {
+ .name = AUFS_PLINKDIR_NAME,
+ .len = sizeof(AUFS_PLINKDIR_NAME) - 1
+ },
+ [AuBrWh_ORPH] = {
+ .name = AUFS_ORPHDIR_NAME,
+ .len = sizeof(AUFS_ORPHDIR_NAME) - 1
+ }
+ };
+ struct au_wh_base base[] = {
+ [AuBrWh_BASE] = {
+ .name = base_name + AuBrWh_BASE,
+ .dentry = NULL
+ },
+ [AuBrWh_PLINK] = {
+ .name = base_name + AuBrWh_PLINK,
+ .dentry = NULL
+ },
+ [AuBrWh_ORPH] = {
+ .name = base_name + AuBrWh_ORPH,
+ .dentry = NULL
+ }
+ };
+
+ if (wbr)
+ WbrWhMustWriteLock(wbr);
+
+ for (i = 0; i < AuBrWh_Last; i++) {
+ /* doubly whiteouted */
+ struct dentry *d;
+
+ d = au_wh_lkup(h_root, (void *)base[i].name, br);
+ err = PTR_ERR(d);
+ if (IS_ERR(d))
+ goto out;
+
+ base[i].dentry = d;
+ AuDebugOn(wbr
+ && wbr->wbr_wh[i]
+ && wbr->wbr_wh[i] != base[i].dentry);
+ }
+
+ if (wbr)
+ for (i = 0; i < AuBrWh_Last; i++) {
+ dput(wbr->wbr_wh[i]);
+ wbr->wbr_wh[i] = NULL;
+ }
+
+ err = 0;
+ if (!au_br_writable(br->br_perm)) {
+ h_dir = h_root->d_inode;
+ au_wh_init_ro(h_dir, base, &path);
+ } else if (!au_br_wh_linkable(br->br_perm)) {
+ err = au_wh_init_rw_nolink(h_root, wbr, do_plink, base, &path);
+ if (err > 0)
+ goto out;
+ else if (err)
+ goto out_err;
+ } else {
+ err = au_wh_init_rw(h_root, wbr, do_plink, base, &path);
+ if (err > 0)
+ goto out;
+ else if (err)
+ goto out_err;
+ }
+ goto out; /* success */
+
+out_err:
+ pr_err("an error(%d) on the writable branch %.*s(%s)\n",
+ err, AuDLNPair(h_root), au_sbtype(h_root->d_sb));
+out:
+ for (i = 0; i < AuBrWh_Last; i++)
+ dput(base[i].dentry);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+/*
+ * whiteouts are all hard-linked usually.
+ * when its link count reaches a ceiling, we create a new whiteout base
+ * asynchronously.
+ */
+
+struct reinit_br_wh {
+ struct super_block *sb;
+ struct au_branch *br;
+};
+
+static void reinit_br_wh(void *arg)
+{
+ int err;
+ aufs_bindex_t bindex;
+ struct path h_path;
+ struct reinit_br_wh *a = arg;
+ struct au_wbr *wbr;
+ struct inode *dir;
+ struct dentry *h_root;
+ struct au_hinode *hdir;
+
+ err = 0;
+ wbr = a->br->br_wbr;
+ /* big aufs lock */
+ si_noflush_write_lock(a->sb);
+ if (!au_br_writable(a->br->br_perm))
+ goto out;
+ bindex = au_br_index(a->sb, a->br->br_id);
+ if (unlikely(bindex < 0))
+ goto out;
+
+ di_read_lock_parent(a->sb->s_root, AuLock_IR);
+ dir = a->sb->s_root->d_inode;
+ hdir = au_hi(dir, bindex);
+ h_root = au_h_dptr(a->sb->s_root, bindex);
+
+ au_hn_imtx_lock_nested(hdir, AuLsc_I_PARENT);
+ wbr_wh_write_lock(wbr);
+ err = au_h_verify(wbr->wbr_whbase, au_opt_udba(a->sb), hdir->hi_inode,
+ h_root, a->br);
+ if (!err) {
+ err = mnt_want_write(a->br->br_mnt);
+ if (!err) {
+ h_path.dentry = wbr->wbr_whbase;
+ h_path.mnt = a->br->br_mnt;
+ err = vfsub_unlink(hdir->hi_inode, &h_path, /*force*/0);
+ mnt_drop_write(a->br->br_mnt);
+ }
+ } else {
+ pr_warning("%.*s is moved, ignored\n",
+ AuDLNPair(wbr->wbr_whbase));
+ err = 0;
+ }
+ dput(wbr->wbr_whbase);
+ wbr->wbr_whbase = NULL;
+ if (!err)
+ err = au_wh_init(h_root, a->br, a->sb);
+ wbr_wh_write_unlock(wbr);
+ au_hn_imtx_unlock(hdir);
+ di_read_unlock(a->sb->s_root, AuLock_IR);
+
+out:
+ if (wbr)
+ atomic_dec(&wbr->wbr_wh_running);
+ atomic_dec(&a->br->br_count);
+ si_write_unlock(a->sb);
+ au_nwt_done(&au_sbi(a->sb)->si_nowait);
+ kfree(arg);
+ if (unlikely(err))
+ AuIOErr("err %d\n", err);
+}
+
+static void kick_reinit_br_wh(struct super_block *sb, struct au_branch *br)
+{
+ int do_dec, wkq_err;
+ struct reinit_br_wh *arg;
+
+ do_dec = 1;
+ if (atomic_inc_return(&br->br_wbr->wbr_wh_running) != 1)
+ goto out;
+
+ /* ignore ENOMEM */
+ arg = kmalloc(sizeof(*arg), GFP_NOFS);
+ if (arg) {
+ /*
+ * dec(wh_running), kfree(arg) and dec(br_count)
+ * in reinit function
+ */
+ arg->sb = sb;
+ arg->br = br;
+ atomic_inc(&br->br_count);
+ wkq_err = au_wkq_nowait(reinit_br_wh, arg, sb, /*flags*/0);
+ if (unlikely(wkq_err)) {
+ atomic_dec(&br->br_wbr->wbr_wh_running);
+ atomic_dec(&br->br_count);
+ kfree(arg);
+ }
+ do_dec = 0;
+ }
+
+out:
+ if (do_dec)
+ atomic_dec(&br->br_wbr->wbr_wh_running);
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * create the whiteout @wh.
+ */
+static int link_or_create_wh(struct super_block *sb, aufs_bindex_t bindex,
+ struct dentry *wh)
+{
+ int err;
+ struct path h_path = {
+ .dentry = wh
+ };
+ struct au_branch *br;
+ struct au_wbr *wbr;
+ struct dentry *h_parent;
+ struct inode *h_dir;
+
+ h_parent = wh->d_parent; /* dir inode is locked */
+ h_dir = h_parent->d_inode;
+ IMustLock(h_dir);
+
+ br = au_sbr(sb, bindex);
+ h_path.mnt = br->br_mnt;
+ wbr = br->br_wbr;
+ wbr_wh_read_lock(wbr);
+ if (wbr->wbr_whbase) {
+ err = vfsub_link(wbr->wbr_whbase, h_dir, &h_path);
+ if (!err || err != -EMLINK)
+ goto out;
+
+ /* link count full. re-initialize br_whbase. */
+ kick_reinit_br_wh(sb, br);
+ }
+
+ /* return this error in this context */
+ err = vfsub_create(h_dir, &h_path, WH_MASK);
+
+out:
+ wbr_wh_read_unlock(wbr);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * create or remove the diropq.
+ */
+static struct dentry *do_diropq(struct dentry *dentry, aufs_bindex_t bindex,
+ unsigned int flags)
+{
+ struct dentry *opq_dentry, *h_dentry;
+ struct super_block *sb;
+ struct au_branch *br;
+ int err;
+
+ sb = dentry->d_sb;
+ br = au_sbr(sb, bindex);
+ h_dentry = au_h_dptr(dentry, bindex);
+ opq_dentry = au_lkup_one(&diropq_name, h_dentry, br, /*nd*/NULL);
+ if (IS_ERR(opq_dentry))
+ goto out;
+
+ if (au_ftest_diropq(flags, CREATE)) {
+ err = link_or_create_wh(sb, bindex, opq_dentry);
+ if (!err) {
+ au_set_dbdiropq(dentry, bindex);
+ goto out; /* success */
+ }
+ } else {
+ struct path tmp = {
+ .dentry = opq_dentry,
+ .mnt = br->br_mnt
+ };
+ err = do_unlink_wh(au_h_iptr(dentry->d_inode, bindex), &tmp);
+ if (!err)
+ au_set_dbdiropq(dentry, -1);
+ }
+ dput(opq_dentry);
+ opq_dentry = ERR_PTR(err);
+
+out:
+ return opq_dentry;
+}
+
+struct do_diropq_args {
+ struct dentry **errp;
+ struct dentry *dentry;
+ aufs_bindex_t bindex;
+ unsigned int flags;
+};
+
+static void call_do_diropq(void *args)
+{
+ struct do_diropq_args *a = args;
+ *a->errp = do_diropq(a->dentry, a->bindex, a->flags);
+}
+
+struct dentry *au_diropq_sio(struct dentry *dentry, aufs_bindex_t bindex,
+ unsigned int flags)
+{
+ struct dentry *diropq, *h_dentry;
+
+ h_dentry = au_h_dptr(dentry, bindex);
+ if (!au_test_h_perm_sio(h_dentry->d_inode, MAY_EXEC | MAY_WRITE))
+ diropq = do_diropq(dentry, bindex, flags);
+ else {
+ int wkq_err;
+ struct do_diropq_args args = {
+ .errp = &diropq,
+ .dentry = dentry,
+ .bindex = bindex,
+ .flags = flags
+ };
+
+ wkq_err = au_wkq_wait(call_do_diropq, &args);
+ if (unlikely(wkq_err))
+ diropq = ERR_PTR(wkq_err);
+ }
+
+ return diropq;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * lookup whiteout dentry.
+ * @h_parent: lower parent dentry which must exist and be locked
+ * @base_name: name of dentry which will be whiteouted
+ * returns dentry for whiteout.
+ */
+struct dentry *au_wh_lkup(struct dentry *h_parent, struct qstr *base_name,
+ struct au_branch *br)
+{
+ int err;
+ struct qstr wh_name;
+ struct dentry *wh_dentry;
+
+ err = au_wh_name_alloc(&wh_name, base_name);
+ wh_dentry = ERR_PTR(err);
+ if (!err) {
+ wh_dentry = au_lkup_one(&wh_name, h_parent, br, /*nd*/NULL);
+ kfree(wh_name.name);
+ }
+ return wh_dentry;
+}
+
+/*
+ * link/create a whiteout for @dentry on @bindex.
+ */
+struct dentry *au_wh_create(struct dentry *dentry, aufs_bindex_t bindex,
+ struct dentry *h_parent)
+{
+ struct dentry *wh_dentry;
+ struct super_block *sb;
+ int err;
+
+ sb = dentry->d_sb;
+ wh_dentry = au_wh_lkup(h_parent, &dentry->d_name, au_sbr(sb, bindex));
+ if (!IS_ERR(wh_dentry) && !wh_dentry->d_inode) {
+ err = link_or_create_wh(sb, bindex, wh_dentry);
+ if (!err)
+ au_set_dbwh(dentry, bindex);
+ else {
+ dput(wh_dentry);
+ wh_dentry = ERR_PTR(err);
+ }
+ }
+
+ return wh_dentry;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* Delete all whiteouts in this directory on branch bindex. */
+static int del_wh_children(struct dentry *h_dentry, struct au_nhash *whlist,
+ aufs_bindex_t bindex, struct au_branch *br)
+{
+ int err;
+ unsigned long ul, n;
+ struct qstr wh_name;
+ char *p;
+ struct hlist_head *head;
+ struct au_vdir_wh *tpos;
+ struct hlist_node *pos;
+ struct au_vdir_destr *str;
+
+ err = -ENOMEM;
+ p = __getname_gfp(GFP_NOFS);
+ wh_name.name = p;
+ if (unlikely(!wh_name.name))
+ goto out;
+
+ err = 0;
+ memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN);
+ p += AUFS_WH_PFX_LEN;
+ n = whlist->nh_num;
+ head = whlist->nh_head;
+ for (ul = 0; !err && ul < n; ul++, head++) {
+ hlist_for_each_entry(tpos, pos, head, wh_hash) {
+ if (tpos->wh_bindex != bindex)
+ continue;
+
+ str = &tpos->wh_str;
+ if (str->len + AUFS_WH_PFX_LEN <= PATH_MAX) {
+ memcpy(p, str->name, str->len);
+ wh_name.len = AUFS_WH_PFX_LEN + str->len;
+ err = unlink_wh_name(h_dentry, &wh_name, br);
+ if (!err)
+ continue;
+ break;
+ }
+ AuIOErr("whiteout name too long %.*s\n",
+ str->len, str->name);
+ err = -EIO;
+ break;
+ }
+ }
+ __putname(wh_name.name);
+
+out:
+ return err;
+}
+
+struct del_wh_children_args {
+ int *errp;
+ struct dentry *h_dentry;
+ struct au_nhash *whlist;
+ aufs_bindex_t bindex;
+ struct au_branch *br;
+};
+
+static void call_del_wh_children(void *args)
+{
+ struct del_wh_children_args *a = args;
+ *a->errp = del_wh_children(a->h_dentry, a->whlist, a->bindex, a->br);
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct au_whtmp_rmdir *au_whtmp_rmdir_alloc(struct super_block *sb, gfp_t gfp)
+{
+ struct au_whtmp_rmdir *whtmp;
+ int err;
+ unsigned int rdhash;
+
+ SiMustAnyLock(sb);
+
+ whtmp = kmalloc(sizeof(*whtmp), gfp);
+ if (unlikely(!whtmp)) {
+ whtmp = ERR_PTR(-ENOMEM);
+ goto out;
+ }
+
+ whtmp->dir = NULL;
+ whtmp->br = NULL;
+ whtmp->wh_dentry = NULL;
+ /* no estimation for dir size */
+ rdhash = au_sbi(sb)->si_rdhash;
+ if (!rdhash)
+ rdhash = AUFS_RDHASH_DEF;
+ err = au_nhash_alloc(&whtmp->whlist, rdhash, gfp);
+ if (unlikely(err)) {
+ kfree(whtmp);
+ whtmp = ERR_PTR(err);
+ }
+
+out:
+ return whtmp;
+}
+
+void au_whtmp_rmdir_free(struct au_whtmp_rmdir *whtmp)
+{
+ if (whtmp->br)
+ atomic_dec(&whtmp->br->br_count);
+ dput(whtmp->wh_dentry);
+ iput(whtmp->dir);
+ au_nhash_wh_free(&whtmp->whlist);
+ kfree(whtmp);
+}
+
+/*
+ * rmdir the whiteouted temporary named dir @h_dentry.
+ * @whlist: whiteouted children.
+ */
+int au_whtmp_rmdir(struct inode *dir, aufs_bindex_t bindex,
+ struct dentry *wh_dentry, struct au_nhash *whlist)
+{
+ int err;
+ struct path h_tmp;
+ struct inode *wh_inode, *h_dir;
+ struct au_branch *br;
+
+ h_dir = wh_dentry->d_parent->d_inode; /* dir inode is locked */
+ IMustLock(h_dir);
+
+ br = au_sbr(dir->i_sb, bindex);
+ wh_inode = wh_dentry->d_inode;
+ mutex_lock_nested(&wh_inode->i_mutex, AuLsc_I_CHILD);
+
+ /*
+ * someone else might change some whiteouts while we were sleeping.
+ * it means this whlist may have an obsoleted entry.
+ */
+ if (!au_test_h_perm_sio(wh_inode, MAY_EXEC | MAY_WRITE))
+ err = del_wh_children(wh_dentry, whlist, bindex, br);
+ else {
+ int wkq_err;
+ struct del_wh_children_args args = {
+ .errp = &err,
+ .h_dentry = wh_dentry,
+ .whlist = whlist,
+ .bindex = bindex,
+ .br = br
+ };
+
+ wkq_err = au_wkq_wait(call_del_wh_children, &args);
+ if (unlikely(wkq_err))
+ err = wkq_err;
+ }
+ mutex_unlock(&wh_inode->i_mutex);
+
+ if (!err) {
+ h_tmp.dentry = wh_dentry;
+ h_tmp.mnt = br->br_mnt;
+ err = vfsub_rmdir(h_dir, &h_tmp);
+ }
+
+ if (!err) {
+ if (au_ibstart(dir) == bindex) {
+ /* todo: dir->i_mutex is necessary */
+ au_cpup_attr_timesizes(dir);
+ vfsub_drop_nlink(dir);
+ }
+ return 0; /* success */
+ }
+
+ pr_warning("failed removing %.*s(%d), ignored\n",
+ AuDLNPair(wh_dentry), err);
+ return err;
+}
+
+static void call_rmdir_whtmp(void *args)
+{
+ int err;
+ aufs_bindex_t bindex;
+ struct au_whtmp_rmdir *a = args;
+ struct super_block *sb;
+ struct dentry *h_parent;
+ struct inode *h_dir;
+ struct au_hinode *hdir;
+
+ /* rmdir by nfsd may cause deadlock with this i_mutex */
+ /* mutex_lock(&a->dir->i_mutex); */
+ err = -EROFS;
+ sb = a->dir->i_sb;
+ si_read_lock(sb, !AuLock_FLUSH);
+ if (!au_br_writable(a->br->br_perm))
+ goto out;
+ bindex = au_br_index(sb, a->br->br_id);
+ if (unlikely(bindex < 0))
+ goto out;
+
+ err = -EIO;
+ ii_write_lock_parent(a->dir);
+ h_parent = dget_parent(a->wh_dentry);
+ h_dir = h_parent->d_inode;
+ hdir = au_hi(a->dir, bindex);
+ au_hn_imtx_lock_nested(hdir, AuLsc_I_PARENT);
+ err = au_h_verify(a->wh_dentry, au_opt_udba(sb), h_dir, h_parent,
+ a->br);
+ if (!err) {
+ err = mnt_want_write(a->br->br_mnt);
+ if (!err) {
+ err = au_whtmp_rmdir(a->dir, bindex, a->wh_dentry,
+ &a->whlist);
+ mnt_drop_write(a->br->br_mnt);
+ }
+ }
+ au_hn_imtx_unlock(hdir);
+ dput(h_parent);
+ ii_write_unlock(a->dir);
+
+out:
+ /* mutex_unlock(&a->dir->i_mutex); */
+ au_whtmp_rmdir_free(a);
+ si_read_unlock(sb);
+ au_nwt_done(&au_sbi(sb)->si_nowait);
+ if (unlikely(err))
+ AuIOErr("err %d\n", err);
+}
+
+void au_whtmp_kick_rmdir(struct inode *dir, aufs_bindex_t bindex,
+ struct dentry *wh_dentry, struct au_whtmp_rmdir *args)
+{
+ int wkq_err;
+ struct super_block *sb;
+
+ IMustLock(dir);
+
+ /* all post-process will be done in do_rmdir_whtmp(). */
+ sb = dir->i_sb;
+ args->dir = au_igrab(dir);
+ args->br = au_sbr(sb, bindex);
+ atomic_inc(&args->br->br_count);
+ args->wh_dentry = dget(wh_dentry);
+ wkq_err = au_wkq_nowait(call_rmdir_whtmp, args, sb, /*flags*/0);
+ if (unlikely(wkq_err)) {
+ pr_warning("rmdir error %.*s (%d), ignored\n",
+ AuDLNPair(wh_dentry), wkq_err);
+ au_whtmp_rmdir_free(args);
+ }
+}
diff -urN a/fs/aufs/whout.h b/fs/aufs/whout.h
--- a/fs/aufs/whout.h 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/whout.h 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * whiteout for logical deletion and opaque directory
+ */
+
+#ifndef __AUFS_WHOUT_H__
+#define __AUFS_WHOUT_H__
+
+#ifdef __KERNEL__
+
+#include "dir.h"
+
+/* whout.c */
+int au_wh_name_alloc(struct qstr *wh, const struct qstr *name);
+struct au_branch;
+int au_wh_test(struct dentry *h_parent, struct qstr *wh_name,
+ struct au_branch *br, int try_sio);
+int au_diropq_test(struct dentry *h_dentry, struct au_branch *br);
+struct dentry *au_whtmp_lkup(struct dentry *h_parent, struct au_branch *br,
+ struct qstr *prefix);
+int au_whtmp_ren(struct dentry *h_dentry, struct au_branch *br);
+int au_wh_unlink_dentry(struct inode *h_dir, struct path *h_path,
+ struct dentry *dentry);
+int au_wh_init(struct dentry *h_parent, struct au_branch *br,
+ struct super_block *sb);
+
+/* diropq flags */
+#define AuDiropq_CREATE 1
+#define au_ftest_diropq(flags, name) ((flags) & AuDiropq_##name)
+#define au_fset_diropq(flags, name) \
+ do { (flags) |= AuDiropq_##name; } while (0)
+#define au_fclr_diropq(flags, name) \
+ do { (flags) &= ~AuDiropq_##name; } while (0)
+
+struct dentry *au_diropq_sio(struct dentry *dentry, aufs_bindex_t bindex,
+ unsigned int flags);
+struct dentry *au_wh_lkup(struct dentry *h_parent, struct qstr *base_name,
+ struct au_branch *br);
+struct dentry *au_wh_create(struct dentry *dentry, aufs_bindex_t bindex,
+ struct dentry *h_parent);
+
+/* real rmdir for the whiteout-ed dir */
+struct au_whtmp_rmdir {
+ struct inode *dir;
+ struct au_branch *br;
+ struct dentry *wh_dentry;
+ struct au_nhash whlist;
+};
+
+struct au_whtmp_rmdir *au_whtmp_rmdir_alloc(struct super_block *sb, gfp_t gfp);
+void au_whtmp_rmdir_free(struct au_whtmp_rmdir *whtmp);
+int au_whtmp_rmdir(struct inode *dir, aufs_bindex_t bindex,
+ struct dentry *wh_dentry, struct au_nhash *whlist);
+void au_whtmp_kick_rmdir(struct inode *dir, aufs_bindex_t bindex,
+ struct dentry *wh_dentry, struct au_whtmp_rmdir *args);
+
+/* ---------------------------------------------------------------------- */
+
+static inline struct dentry *au_diropq_create(struct dentry *dentry,
+ aufs_bindex_t bindex)
+{
+ return au_diropq_sio(dentry, bindex, AuDiropq_CREATE);
+}
+
+static inline int au_diropq_remove(struct dentry *dentry, aufs_bindex_t bindex)
+{
+ return PTR_ERR(au_diropq_sio(dentry, bindex, !AuDiropq_CREATE));
+}
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_WHOUT_H__ */
diff -urN a/fs/aufs/wkq.c b/fs/aufs/wkq.c
--- a/fs/aufs/wkq.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/wkq.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,214 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * workqueue for asynchronous/super-io operations
+ * todo: try new dredential scheme
+ */
+
+#include <linux/module.h>
+#include "aufs.h"
+
+/* internal workqueue named AUFS_WKQ_NAME */
+
+static struct workqueue_struct *au_wkq;
+
+struct au_wkinfo {
+ struct work_struct wk;
+ struct kobject *kobj;
+
+ unsigned int flags; /* see wkq.h */
+
+ au_wkq_func_t func;
+ void *args;
+
+ struct completion *comp;
+};
+
+/* ---------------------------------------------------------------------- */
+
+static void wkq_func(struct work_struct *wk)
+{
+ struct au_wkinfo *wkinfo = container_of(wk, struct au_wkinfo, wk);
+
+ AuDebugOn(current_fsuid());
+ AuDebugOn(rlimit(RLIMIT_FSIZE) != RLIM_INFINITY);
+
+ wkinfo->func(wkinfo->args);
+ if (au_ftest_wkq(wkinfo->flags, WAIT))
+ complete(wkinfo->comp);
+ else {
+ kobject_put(wkinfo->kobj);
+ module_put(THIS_MODULE); /* todo: ?? */
+ kfree(wkinfo);
+ }
+}
+
+/*
+ * Since struct completion is large, try allocating it dynamically.
+ */
+#if defined(CONFIG_4KSTACKS) || defined(AuTest4KSTACKS)
+#define AuWkqCompDeclare(name) struct completion *comp = NULL
+
+static int au_wkq_comp_alloc(struct au_wkinfo *wkinfo, struct completion **comp)
+{
+ *comp = kmalloc(sizeof(**comp), GFP_NOFS);
+ if (*comp) {
+ init_completion(*comp);
+ wkinfo->comp = *comp;
+ return 0;
+ }
+ return -ENOMEM;
+}
+
+static void au_wkq_comp_free(struct completion *comp)
+{
+ kfree(comp);
+}
+
+#else
+
+/* no braces */
+#define AuWkqCompDeclare(name) \
+ DECLARE_COMPLETION_ONSTACK(_ ## name); \
+ struct completion *comp = &_ ## name
+
+static int au_wkq_comp_alloc(struct au_wkinfo *wkinfo, struct completion **comp)
+{
+ wkinfo->comp = *comp;
+ return 0;
+}
+
+static void au_wkq_comp_free(struct completion *comp __maybe_unused)
+{
+ /* empty */
+}
+#endif /* 4KSTACKS */
+
+static void au_wkq_run(struct au_wkinfo *wkinfo)
+{
+ if (au_ftest_wkq(wkinfo->flags, NEST)) {
+ if (au_wkq_test()) {
+ AuWarn1("wkq from wkq, due to a dead dir by UDBA?\n");
+ AuDebugOn(au_ftest_wkq(wkinfo->flags, WAIT));
+ }
+ } else
+ au_dbg_verify_kthread();
+
+ if (au_ftest_wkq(wkinfo->flags, WAIT)) {
+ INIT_WORK_ONSTACK(&wkinfo->wk, wkq_func);
+ queue_work(au_wkq, &wkinfo->wk);
+ } else {
+ INIT_WORK(&wkinfo->wk, wkq_func);
+ schedule_work(&wkinfo->wk);
+ }
+}
+
+/*
+ * Be careful. It is easy to make deadlock happen.
+ * processA: lock, wkq and wait
+ * processB: wkq and wait, lock in wkq
+ * --> deadlock
+ */
+int au_wkq_do_wait(unsigned int flags, au_wkq_func_t func, void *args)
+{
+ int err;
+ AuWkqCompDeclare(comp);
+ struct au_wkinfo wkinfo = {
+ .flags = flags,
+ .func = func,
+ .args = args
+ };
+
+ err = au_wkq_comp_alloc(&wkinfo, &comp);
+ if (!err) {
+ au_wkq_run(&wkinfo);
+ /* no timeout, no interrupt */
+ wait_for_completion(wkinfo.comp);
+ au_wkq_comp_free(comp);
+ destroy_work_on_stack(&wkinfo.wk);
+ }
+
+ return err;
+
+}
+
+/*
+ * Note: dget/dput() in func for aufs dentries are not supported. It will be a
+ * problem in a concurrent umounting.
+ */
+int au_wkq_nowait(au_wkq_func_t func, void *args, struct super_block *sb,
+ unsigned int flags)
+{
+ int err;
+ struct au_wkinfo *wkinfo;
+
+ atomic_inc(&au_sbi(sb)->si_nowait.nw_len);
+
+ /*
+ * wkq_func() must free this wkinfo.
+ * it highly depends upon the implementation of workqueue.
+ */
+ err = 0;
+ wkinfo = kmalloc(sizeof(*wkinfo), GFP_NOFS);
+ if (wkinfo) {
+ wkinfo->kobj = &au_sbi(sb)->si_kobj;
+ wkinfo->flags = flags & ~AuWkq_WAIT;
+ wkinfo->func = func;
+ wkinfo->args = args;
+ wkinfo->comp = NULL;
+ kobject_get(wkinfo->kobj);
+ __module_get(THIS_MODULE); /* todo: ?? */
+
+ au_wkq_run(wkinfo);
+ } else {
+ err = -ENOMEM;
+ au_nwt_done(&au_sbi(sb)->si_nowait);
+ }
+
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+void au_nwt_init(struct au_nowait_tasks *nwt)
+{
+ atomic_set(&nwt->nw_len, 0);
+ /* smp_mb(); */ /* atomic_set */
+ init_waitqueue_head(&nwt->nw_wq);
+}
+
+void au_wkq_fin(void)
+{
+ destroy_workqueue(au_wkq);
+}
+
+int __init au_wkq_init(void)
+{
+ int err;
+
+ err = 0;
+ BUILD_BUG_ON(!WQ_RESCUER);
+ au_wkq = alloc_workqueue(AUFS_WKQ_NAME, !WQ_RESCUER, WQ_DFL_ACTIVE);
+ if (IS_ERR(au_wkq))
+ err = PTR_ERR(au_wkq);
+ else if (!au_wkq)
+ err = -ENOMEM;
+
+ return err;
+}
diff -urN a/fs/aufs/wkq.h b/fs/aufs/wkq.h
--- a/fs/aufs/wkq.h 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/wkq.h 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * workqueue for asynchronous/super-io operations
+ * todo: try new credentials management scheme
+ */
+
+#ifndef __AUFS_WKQ_H__
+#define __AUFS_WKQ_H__
+
+#ifdef __KERNEL__
+
+struct super_block;
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * in the next operation, wait for the 'nowait' tasks in system-wide workqueue
+ */
+struct au_nowait_tasks {
+ atomic_t nw_len;
+ wait_queue_head_t nw_wq;
+};
+
+/* ---------------------------------------------------------------------- */
+
+typedef void (*au_wkq_func_t)(void *args);
+
+/* wkq flags */
+#define AuWkq_WAIT 1
+#define AuWkq_NEST (1 << 1)
+#define au_ftest_wkq(flags, name) ((flags) & AuWkq_##name)
+#define au_fset_wkq(flags, name) \
+ do { (flags) |= AuWkq_##name; } while (0)
+#define au_fclr_wkq(flags, name) \
+ do { (flags) &= ~AuWkq_##name; } while (0)
+
+#ifndef CONFIG_AUFS_HNOTIFY
+#undef AuWkq_NEST
+#define AuWkq_NEST 0
+#endif
+
+/* wkq.c */
+int au_wkq_do_wait(unsigned int flags, au_wkq_func_t func, void *args);
+int au_wkq_nowait(au_wkq_func_t func, void *args, struct super_block *sb,
+ unsigned int flags);
+void au_nwt_init(struct au_nowait_tasks *nwt);
+int __init au_wkq_init(void);
+void au_wkq_fin(void);
+
+/* ---------------------------------------------------------------------- */
+
+static inline int au_wkq_test(void)
+{
+ return current->flags & PF_WQ_WORKER;
+}
+
+static inline int au_wkq_wait(au_wkq_func_t func, void *args)
+{
+ return au_wkq_do_wait(AuWkq_WAIT, func, args);
+}
+
+static inline void au_nwt_done(struct au_nowait_tasks *nwt)
+{
+ if (atomic_dec_and_test(&nwt->nw_len))
+ wake_up_all(&nwt->nw_wq);
+}
+
+static inline int au_nwt_flush(struct au_nowait_tasks *nwt)
+{
+ wait_event(nwt->nw_wq, !atomic_read(&nwt->nw_len));
+ return 0;
+}
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_WKQ_H__ */
diff -urN a/fs/aufs/xino.c b/fs/aufs/xino.c
--- a/fs/aufs/xino.c 1969-12-31 17:00:00.000000000 -0700
+++ b/fs/aufs/xino.c 2012-01-21 19:13:59.000000000 -0700
@@ -0,0 +1,1264 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * external inode number translation table and bitmap
+ */
+
+#include <linux/seq_file.h>
+#include "aufs.h"
+
+/* todo: unnecessary to support mmap_sem since kernel-space? */
+ssize_t xino_fread(au_readf_t func, struct file *file, void *kbuf, size_t size,
+ loff_t *pos)
+{
+ ssize_t err;
+ mm_segment_t oldfs;
+ union {
+ void *k;
+ char __user *u;
+ } buf;
+
+ buf.k = kbuf;
+ oldfs = get_fs();
+ set_fs(KERNEL_DS);
+ do {
+ /* todo: signal_pending? */
+ err = func(file, buf.u, size, pos);
+ } while (err == -EAGAIN || err == -EINTR);
+ set_fs(oldfs);
+
+#if 0 /* reserved for future use */
+ if (err > 0)
+ fsnotify_access(file->f_dentry);
+#endif
+
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static ssize_t do_xino_fwrite(au_writef_t func, struct file *file, void *kbuf,
+ size_t size, loff_t *pos)
+{
+ ssize_t err;
+ mm_segment_t oldfs;
+ union {
+ void *k;
+ const char __user *u;
+ } buf;
+
+ buf.k = kbuf;
+ oldfs = get_fs();
+ set_fs(KERNEL_DS);
+ do {
+ /* todo: signal_pending? */
+ err = func(file, buf.u, size, pos);
+ } while (err == -EAGAIN || err == -EINTR);
+ set_fs(oldfs);
+
+#if 0 /* reserved for future use */
+ if (err > 0)
+ fsnotify_modify(file->f_dentry);
+#endif
+
+ return err;
+}
+
+struct do_xino_fwrite_args {
+ ssize_t *errp;
+ au_writef_t func;
+ struct file *file;
+ void *buf;
+ size_t size;
+ loff_t *pos;
+};
+
+static void call_do_xino_fwrite(void *args)
+{
+ struct do_xino_fwrite_args *a = args;
+ *a->errp = do_xino_fwrite(a->func, a->file, a->buf, a->size, a->pos);
+}
+
+ssize_t xino_fwrite(au_writef_t func, struct file *file, void *buf, size_t size,
+ loff_t *pos)
+{
+ ssize_t err;
+
+ /* todo: signal block and no wkq? */
+ if (rlimit(RLIMIT_FSIZE) == RLIM_INFINITY) {
+ lockdep_off();
+ err = do_xino_fwrite(func, file, buf, size, pos);
+ lockdep_on();
+ } else {
+ /*
+ * it breaks RLIMIT_FSIZE and normal user's limit,
+ * users should care about quota and real 'filesystem full.'
+ */
+ int wkq_err;
+ struct do_xino_fwrite_args args = {
+ .errp = &err,
+ .func = func,
+ .file = file,
+ .buf = buf,
+ .size = size,
+ .pos = pos
+ };
+
+ wkq_err = au_wkq_wait(call_do_xino_fwrite, &args);
+ if (unlikely(wkq_err))
+ err = wkq_err;
+ }
+
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * create a new xinofile at the same place/path as @base_file.
+ */
+struct file *au_xino_create2(struct file *base_file, struct file *copy_src)
+{
+ struct file *file;
+ struct dentry *base, *parent;
+ struct inode *dir;
+ struct qstr *name;
+ struct path path;
+ int err;
+
+ base = base_file->f_dentry;
+ parent = base->d_parent; /* dir inode is locked */
+ dir = parent->d_inode;
+ IMustLock(dir);
+
+ file = ERR_PTR(-EINVAL);
+ name = &base->d_name;
+ path.dentry = vfsub_lookup_one_len(name->name, parent, name->len);
+ if (IS_ERR(path.dentry)) {
+ file = (void *)path.dentry;
+ pr_err("%.*s lookup err %ld\n",
+ AuLNPair(name), PTR_ERR(path.dentry));
+ goto out;
+ }
+
+ /* no need to mnt_want_write() since we call dentry_open() later */
+ err = vfs_create(dir, path.dentry, S_IRUGO | S_IWUGO, NULL);
+ if (unlikely(err)) {
+ file = ERR_PTR(err);
+ pr_err("%.*s create err %d\n", AuLNPair(name), err);
+ goto out_dput;
+ }
+
+ path.mnt = base_file->f_vfsmnt;
+ file = vfsub_dentry_open(&path,
+ O_RDWR | O_CREAT | O_EXCL | O_LARGEFILE
+ /* | __FMODE_NONOTIFY */);
+ if (IS_ERR(file)) {
+ pr_err("%.*s open err %ld\n", AuLNPair(name), PTR_ERR(file));
+ goto out_dput;
+ }
+
+ err = vfsub_unlink(dir, &file->f_path, /*force*/0);
+ if (unlikely(err)) {
+ pr_err("%.*s unlink err %d\n", AuLNPair(name), err);
+ goto out_fput;
+ }
+
+ if (copy_src) {
+ /* no one can touch copy_src xino */
+ err = au_copy_file(file, copy_src,
+ i_size_read(copy_src->f_dentry->d_inode));
+ if (unlikely(err)) {
+ pr_err("%.*s copy err %d\n", AuLNPair(name), err);
+ goto out_fput;
+ }
+ }
+ goto out_dput; /* success */
+
+out_fput:
+ fput(file);
+ file = ERR_PTR(err);
+out_dput:
+ dput(path.dentry);
+out:
+ return file;
+}
+
+struct au_xino_lock_dir {
+ struct au_hinode *hdir;
+ struct dentry *parent;
+ struct mutex *mtx;
+};
+
+static void au_xino_lock_dir(struct super_block *sb, struct file *xino,
+ struct au_xino_lock_dir *ldir)
+{
+ aufs_bindex_t brid, bindex;
+
+ ldir->hdir = NULL;
+ bindex = -1;
+ brid = au_xino_brid(sb);
+ if (brid >= 0)
+ bindex = au_br_index(sb, brid);
+ if (bindex >= 0) {
+ ldir->hdir = au_hi(sb->s_root->d_inode, bindex);
+ au_hn_imtx_lock_nested(ldir->hdir, AuLsc_I_PARENT);
+ } else {
+ ldir->parent = dget_parent(xino->f_dentry);
+ ldir->mtx = &ldir->parent->d_inode->i_mutex;
+ mutex_lock_nested(ldir->mtx, AuLsc_I_PARENT);
+ }
+}
+
+static void au_xino_unlock_dir(struct au_xino_lock_dir *ldir)
+{
+ if (ldir->hdir)
+ au_hn_imtx_unlock(ldir->hdir);
+ else {
+ mutex_unlock(ldir->mtx);
+ dput(ldir->parent);
+ }
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* trucate xino files asynchronously */
+
+int au_xino_trunc(struct super_block *sb, aufs_bindex_t bindex)
+{
+ int err;
+ aufs_bindex_t bi, bend;
+ struct au_branch *br;
+ struct file *new_xino, *file;
+ struct super_block *h_sb;
+ struct au_xino_lock_dir ldir;
+
+ err = -EINVAL;
+ bend = au_sbend(sb);
+ if (unlikely(bindex < 0 || bend < bindex))
+ goto out;
+ br = au_sbr(sb, bindex);
+ file = br->br_xino.xi_file;
+ if (!file)
+ goto out;
+
+ au_xino_lock_dir(sb, file, &ldir);
+ /* mnt_want_write() is unnecessary here */
+ new_xino = au_xino_create2(file, file);
+ au_xino_unlock_dir(&ldir);
+ err = PTR_ERR(new_xino);
+ if (IS_ERR(new_xino))
+ goto out;
+ err = 0;
+ fput(file);
+ br->br_xino.xi_file = new_xino;
+
+ h_sb = br->br_mnt->mnt_sb;
+ for (bi = 0; bi <= bend; bi++) {
+ if (unlikely(bi == bindex))
+ continue;
+ br = au_sbr(sb, bi);
+ if (br->br_mnt->mnt_sb != h_sb)
+ continue;
+
+ fput(br->br_xino.xi_file);
+ br->br_xino.xi_file = new_xino;
+ get_file(new_xino);
+ }
+
+out:
+ return err;
+}
+
+struct xino_do_trunc_args {
+ struct super_block *sb;
+ struct au_branch *br;
+};
+
+static void xino_do_trunc(void *_args)
+{
+ struct xino_do_trunc_args *args = _args;
+ struct super_block *sb;
+ struct au_branch *br;
+ struct inode *dir;
+ int err;
+ aufs_bindex_t bindex;
+
+ err = 0;
+ sb = args->sb;
+ dir = sb->s_root->d_inode;
+ br = args->br;
+
+ si_noflush_write_lock(sb);
+ ii_read_lock_parent(dir);
+ bindex = au_br_index(sb, br->br_id);
+ err = au_xino_trunc(sb, bindex);
+ if (!err
+ && br->br_xino.xi_file->f_dentry->d_inode->i_blocks
+ >= br->br_xino_upper)
+ br->br_xino_upper += AUFS_XINO_TRUNC_STEP;
+
+ ii_read_unlock(dir);
+ if (unlikely(err))
+ pr_warning("err b%d, (%d)\n", bindex, err);
+ atomic_dec(&br->br_xino_running);
+ atomic_dec(&br->br_count);
+ si_write_unlock(sb);
+ au_nwt_done(&au_sbi(sb)->si_nowait);
+ kfree(args);
+}
+
+static void xino_try_trunc(struct super_block *sb, struct au_branch *br)
+{
+ struct xino_do_trunc_args *args;
+ int wkq_err;
+
+ if (br->br_xino.xi_file->f_dentry->d_inode->i_blocks
+ < br->br_xino_upper)
+ return;
+
+ if (atomic_inc_return(&br->br_xino_running) > 1)
+ goto out;
+
+ /* lock and kfree() will be called in trunc_xino() */
+ args = kmalloc(sizeof(*args), GFP_NOFS);
+ if (unlikely(!args)) {
+ AuErr1("no memory\n");
+ goto out_args;
+ }
+
+ atomic_inc(&br->br_count);
+ args->sb = sb;
+ args->br = br;
+ wkq_err = au_wkq_nowait(xino_do_trunc, args, sb, /*flags*/0);
+ if (!wkq_err)
+ return; /* success */
+
+ pr_err("wkq %d\n", wkq_err);
+ atomic_dec(&br->br_count);
+
+out_args:
+ kfree(args);
+out:
+ atomic_dec(&br->br_xino_running);
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int au_xino_do_write(au_writef_t write, struct file *file,
+ ino_t h_ino, ino_t ino)
+{
+ loff_t pos;
+ ssize_t sz;
+
+ pos = h_ino;
+ if (unlikely(au_loff_max / sizeof(ino) - 1 < pos)) {
+ AuIOErr1("too large hi%lu\n", (unsigned long)h_ino);
+ return -EFBIG;
+ }
+ pos *= sizeof(ino);
+ sz = xino_fwrite(write, file, &ino, sizeof(ino), &pos);
+ if (sz == sizeof(ino))
+ return 0; /* success */
+
+ AuIOErr("write failed (%zd)\n", sz);
+ return -EIO;
+}
+
+/*
+ * write @ino to the xinofile for the specified branch{@sb, @bindex}
+ * at the position of @h_ino.
+ * even if @ino is zero, it is written to the xinofile and means no entry.
+ * if the size of the xino file on a specific filesystem exceeds the watermark,
+ * try truncating it.
+ */
+int au_xino_write(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
+ ino_t ino)
+{
+ int err;
+ unsigned int mnt_flags;
+ struct au_branch *br;
+
+ BUILD_BUG_ON(sizeof(long long) != sizeof(au_loff_max)
+ || ((loff_t)-1) > 0);
+ SiMustAnyLock(sb);
+
+ mnt_flags = au_mntflags(sb);
+ if (!au_opt_test(mnt_flags, XINO))
+ return 0;
+
+ br = au_sbr(sb, bindex);
+ err = au_xino_do_write(au_sbi(sb)->si_xwrite, br->br_xino.xi_file,
+ h_ino, ino);
+ if (!err) {
+ if (au_opt_test(mnt_flags, TRUNC_XINO)
+ && au_test_fs_trunc_xino(br->br_mnt->mnt_sb))
+ xino_try_trunc(sb, br);
+ return 0; /* success */
+ }
+
+ AuIOErr("write failed (%d)\n", err);
+ return -EIO;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* aufs inode number bitmap */
+
+static const int page_bits = (int)PAGE_SIZE * BITS_PER_BYTE;
+static ino_t xib_calc_ino(unsigned long pindex, int bit)
+{
+ ino_t ino;
+
+ AuDebugOn(bit < 0 || page_bits <= bit);
+ ino = AUFS_FIRST_INO + pindex * page_bits + bit;
+ return ino;
+}
+
+static void xib_calc_bit(ino_t ino, unsigned long *pindex, int *bit)
+{
+ AuDebugOn(ino < AUFS_FIRST_INO);
+ ino -= AUFS_FIRST_INO;
+ *pindex = ino / page_bits;
+ *bit = ino % page_bits;
+}
+
+static int xib_pindex(struct super_block *sb, unsigned long pindex)
+{
+ int err;
+ loff_t pos;
+ ssize_t sz;
+ struct au_sbinfo *sbinfo;
+ struct file *xib;
+ unsigned long *p;
+
+ sbinfo = au_sbi(sb);
+ MtxMustLock(&sbinfo->si_xib_mtx);
+ AuDebugOn(pindex > ULONG_MAX / PAGE_SIZE
+ || !au_opt_test(sbinfo->si_mntflags, XINO));
+
+ if (pindex == sbinfo->si_xib_last_pindex)
+ return 0;
+
+ xib = sbinfo->si_xib;
+ p = sbinfo->si_xib_buf;
+ pos = sbinfo->si_xib_last_pindex;
+ pos *= PAGE_SIZE;
+ sz = xino_fwrite(sbinfo->si_xwrite, xib, p, PAGE_SIZE, &pos);
+ if (unlikely(sz != PAGE_SIZE))
+ goto out;
+
+ pos = pindex;
+ pos *= PAGE_SIZE;
+ if (i_size_read(xib->f_dentry->d_inode) >= pos + PAGE_SIZE)
+ sz = xino_fread(sbinfo->si_xread, xib, p, PAGE_SIZE, &pos);
+ else {
+ memset(p, 0, PAGE_SIZE);
+ sz = xino_fwrite(sbinfo->si_xwrite, xib, p, PAGE_SIZE, &pos);
+ }
+ if (sz == PAGE_SIZE) {
+ sbinfo->si_xib_last_pindex = pindex;
+ return 0; /* success */
+ }
+
+out:
+ AuIOErr1("write failed (%zd)\n", sz);
+ err = sz;
+ if (sz >= 0)
+ err = -EIO;
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static void au_xib_clear_bit(struct inode *inode)
+{
+ int err, bit;
+ unsigned long pindex;
+ struct super_block *sb;
+ struct au_sbinfo *sbinfo;
+
+ AuDebugOn(inode->i_nlink);
+
+ sb = inode->i_sb;
+ xib_calc_bit(inode->i_ino, &pindex, &bit);
+ AuDebugOn(page_bits <= bit);
+ sbinfo = au_sbi(sb);
+ mutex_lock(&sbinfo->si_xib_mtx);
+ err = xib_pindex(sb, pindex);
+ if (!err) {
+ clear_bit(bit, sbinfo->si_xib_buf);
+ sbinfo->si_xib_next_bit = bit;
+ }
+ mutex_unlock(&sbinfo->si_xib_mtx);
+}
+
+/* for s_op->delete_inode() */
+void au_xino_delete_inode(struct inode *inode, const int unlinked)
+{
+ int err;
+ unsigned int mnt_flags;
+ aufs_bindex_t bindex, bend, bi;
+ unsigned char try_trunc;
+ struct au_iinfo *iinfo;
+ struct super_block *sb;
+ struct au_hinode *hi;
+ struct inode *h_inode;
+ struct au_branch *br;
+ au_writef_t xwrite;
+
+ sb = inode->i_sb;
+ mnt_flags = au_mntflags(sb);
+ if (!au_opt_test(mnt_flags, XINO)
+ || inode->i_ino == AUFS_ROOT_INO)
+ return;
+
+ if (unlinked) {
+ au_xigen_inc(inode);
+ au_xib_clear_bit(inode);
+ }
+
+ iinfo = au_ii(inode);
+ if (!iinfo)
+ return;
+
+ bindex = iinfo->ii_bstart;
+ if (bindex < 0)
+ return;
+
+ xwrite = au_sbi(sb)->si_xwrite;
+ try_trunc = !!au_opt_test(mnt_flags, TRUNC_XINO);
+ hi = iinfo->ii_hinode + bindex;
+ bend = iinfo->ii_bend;
+ for (; bindex <= bend; bindex++, hi++) {
+ h_inode = hi->hi_inode;
+ if (!h_inode
+ || (!unlinked && h_inode->i_nlink))
+ continue;
+
+ /* inode may not be revalidated */
+ bi = au_br_index(sb, hi->hi_id);
+ if (bi < 0)
+ continue;
+
+ br = au_sbr(sb, bi);
+ err = au_xino_do_write(xwrite, br->br_xino.xi_file,
+ h_inode->i_ino, /*ino*/0);
+ if (!err && try_trunc
+ && au_test_fs_trunc_xino(br->br_mnt->mnt_sb))
+ xino_try_trunc(sb, br);
+ }
+}
+
+/* get an unused inode number from bitmap */
+ino_t au_xino_new_ino(struct super_block *sb)
+{
+ ino_t ino;
+ unsigned long *p, pindex, ul, pend;
+ struct au_sbinfo *sbinfo;
+ struct file *file;
+ int free_bit, err;
+
+ if (!au_opt_test(au_mntflags(sb), XINO))
+ return iunique(sb, AUFS_FIRST_INO);
+
+ sbinfo = au_sbi(sb);
+ mutex_lock(&sbinfo->si_xib_mtx);
+ p = sbinfo->si_xib_buf;
+ free_bit = sbinfo->si_xib_next_bit;
+ if (free_bit < page_bits && !test_bit(free_bit, p))
+ goto out; /* success */
+ free_bit = find_first_zero_bit(p, page_bits);
+ if (free_bit < page_bits)
+ goto out; /* success */
+
+ pindex = sbinfo->si_xib_last_pindex;
+ for (ul = pindex - 1; ul < ULONG_MAX; ul--) {
+ err = xib_pindex(sb, ul);
+ if (unlikely(err))
+ goto out_err;
+ free_bit = find_first_zero_bit(p, page_bits);
+ if (free_bit < page_bits)
+ goto out; /* success */
+ }
+
+ file = sbinfo->si_xib;
+ pend = i_size_read(file->f_dentry->d_inode) / PAGE_SIZE;
+ for (ul = pindex + 1; ul <= pend; ul++) {
+ err = xib_pindex(sb, ul);
+ if (unlikely(err))
+ goto out_err;
+ free_bit = find_first_zero_bit(p, page_bits);
+ if (free_bit < page_bits)
+ goto out; /* success */
+ }
+ BUG();
+
+out:
+ set_bit(free_bit, p);
+ sbinfo->si_xib_next_bit = free_bit + 1;
+ pindex = sbinfo->si_xib_last_pindex;
+ mutex_unlock(&sbinfo->si_xib_mtx);
+ ino = xib_calc_ino(pindex, free_bit);
+ AuDbg("i%lu\n", (unsigned long)ino);
+ return ino;
+out_err:
+ mutex_unlock(&sbinfo->si_xib_mtx);
+ AuDbg("i0\n");
+ return 0;
+}
+
+/*
+ * read @ino from xinofile for the specified branch{@sb, @bindex}
+ * at the position of @h_ino.
+ * if @ino does not exist and @do_new is true, get new one.
+ */
+int au_xino_read(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
+ ino_t *ino)
+{
+ int err;
+ ssize_t sz;
+ loff_t pos;
+ struct file *file;
+ struct au_sbinfo *sbinfo;
+
+ *ino = 0;
+ if (!au_opt_test(au_mntflags(sb), XINO))
+ return 0; /* no xino */
+
+ err = 0;
+ sbinfo = au_sbi(sb);
+ pos = h_ino;
+ if (unlikely(au_loff_max / sizeof(*ino) - 1 < pos)) {
+ AuIOErr1("too large hi%lu\n", (unsigned long)h_ino);
+ return -EFBIG;
+ }
+ pos *= sizeof(*ino);
+
+ file = au_sbr(sb, bindex)->br_xino.xi_file;
+ if (i_size_read(file->f_dentry->d_inode) < pos + sizeof(*ino))
+ return 0; /* no ino */
+
+ sz = xino_fread(sbinfo->si_xread, file, ino, sizeof(*ino), &pos);
+ if (sz == sizeof(*ino))
+ return 0; /* success */
+
+ err = sz;
+ if (unlikely(sz >= 0)) {
+ err = -EIO;
+ AuIOErr("xino read error (%zd)\n", sz);
+ }
+
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* create and set a new xino file */
+
+struct file *au_xino_create(struct super_block *sb, char *fname, int silent)
+{
+ struct file *file;
+ struct dentry *h_parent, *d;
+ struct inode *h_dir;
+ int err;
+
+ /*
+ * at mount-time, and the xino file is the default path,
+ * hnotify is disabled so we have no notify events to ignore.
+ * when a user specified the xino, we cannot get au_hdir to be ignored.
+ */
+ file = vfsub_filp_open(fname, O_RDWR | O_CREAT | O_EXCL | O_LARGEFILE
+ /* | __FMODE_NONOTIFY */,
+ S_IRUGO | S_IWUGO);
+ if (IS_ERR(file)) {
+ if (!silent)
+ pr_err("open %s(%ld)\n", fname, PTR_ERR(file));
+ return file;
+ }
+
+ /* keep file count */
+ h_parent = dget_parent(file->f_dentry);
+ h_dir = h_parent->d_inode;
+ mutex_lock_nested(&h_dir->i_mutex, AuLsc_I_PARENT);
+ /* mnt_want_write() is unnecessary here */
+ err = vfsub_unlink(h_dir, &file->f_path, /*force*/0);
+ mutex_unlock(&h_dir->i_mutex);
+ dput(h_parent);
+ if (unlikely(err)) {
+ if (!silent)
+ pr_err("unlink %s(%d)\n", fname, err);
+ goto out;
+ }
+
+ err = -EINVAL;
+ d = file->f_dentry;
+ if (unlikely(sb == d->d_sb)) {
+ if (!silent)
+ pr_err("%s must be outside\n", fname);
+ goto out;
+ }
+ if (unlikely(au_test_fs_bad_xino(d->d_sb))) {
+ if (!silent)
+ pr_err("xino doesn't support %s(%s)\n",
+ fname, au_sbtype(d->d_sb));
+ goto out;
+ }
+ return file; /* success */
+
+out:
+ fput(file);
+ file = ERR_PTR(err);
+ return file;
+}
+
+/*
+ * find another branch who is on the same filesystem of the specified
+ * branch{@btgt}. search until @bend.
+ */
+static int is_sb_shared(struct super_block *sb, aufs_bindex_t btgt,
+ aufs_bindex_t bend)
+{
+ aufs_bindex_t bindex;
+ struct super_block *tgt_sb = au_sbr_sb(sb, btgt);
+
+ for (bindex = 0; bindex < btgt; bindex++)
+ if (unlikely(tgt_sb == au_sbr_sb(sb, bindex)))
+ return bindex;
+ for (bindex++; bindex <= bend; bindex++)
+ if (unlikely(tgt_sb == au_sbr_sb(sb, bindex)))
+ return bindex;
+ return -1;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * initialize the xinofile for the specified branch @br
+ * at the place/path where @base_file indicates.
+ * test whether another branch is on the same filesystem or not,
+ * if @do_test is true.
+ */
+int au_xino_br(struct super_block *sb, struct au_branch *br, ino_t h_ino,
+ struct file *base_file, int do_test)
+{
+ int err;
+ ino_t ino;
+ aufs_bindex_t bend, bindex;
+ struct au_branch *shared_br, *b;
+ struct file *file;
+ struct super_block *tgt_sb;
+
+ shared_br = NULL;
+ bend = au_sbend(sb);
+ if (do_test) {
+ tgt_sb = br->br_mnt->mnt_sb;
+ for (bindex = 0; bindex <= bend; bindex++) {
+ b = au_sbr(sb, bindex);
+ if (tgt_sb == b->br_mnt->mnt_sb) {
+ shared_br = b;
+ break;
+ }
+ }
+ }
+
+ if (!shared_br || !shared_br->br_xino.xi_file) {
+ struct au_xino_lock_dir ldir;
+
+ au_xino_lock_dir(sb, base_file, &ldir);
+ /* mnt_want_write() is unnecessary here */
+ file = au_xino_create2(base_file, NULL);
+ au_xino_unlock_dir(&ldir);
+ err = PTR_ERR(file);
+ if (IS_ERR(file))
+ goto out;
+ br->br_xino.xi_file = file;
+ } else {
+ br->br_xino.xi_file = shared_br->br_xino.xi_file;
+ get_file(br->br_xino.xi_file);
+ }
+
+ ino = AUFS_ROOT_INO;
+ err = au_xino_do_write(au_sbi(sb)->si_xwrite, br->br_xino.xi_file,
+ h_ino, ino);
+ if (unlikely(err)) {
+ fput(br->br_xino.xi_file);
+ br->br_xino.xi_file = NULL;
+ }
+
+out:
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* trucate a xino bitmap file */
+
+/* todo: slow */
+static int do_xib_restore(struct super_block *sb, struct file *file, void *page)
+{
+ int err, bit;
+ ssize_t sz;
+ unsigned long pindex;
+ loff_t pos, pend;
+ struct au_sbinfo *sbinfo;
+ au_readf_t func;
+ ino_t *ino;
+ unsigned long *p;
+
+ err = 0;
+ sbinfo = au_sbi(sb);
+ MtxMustLock(&sbinfo->si_xib_mtx);
+ p = sbinfo->si_xib_buf;
+ func = sbinfo->si_xread;
+ pend = i_size_read(file->f_dentry->d_inode);
+ pos = 0;
+ while (pos < pend) {
+ sz = xino_fread(func, file, page, PAGE_SIZE, &pos);
+ err = sz;
+ if (unlikely(sz <= 0))
+ goto out;
+
+ err = 0;
+ for (ino = page; sz > 0; ino++, sz -= sizeof(ino)) {
+ if (unlikely(*ino < AUFS_FIRST_INO))
+ continue;
+
+ xib_calc_bit(*ino, &pindex, &bit);
+ AuDebugOn(page_bits <= bit);
+ err = xib_pindex(sb, pindex);
+ if (!err)
+ set_bit(bit, p);
+ else
+ goto out;
+ }
+ }
+
+out:
+ return err;
+}
+
+static int xib_restore(struct super_block *sb)
+{
+ int err;
+ aufs_bindex_t bindex, bend;
+ void *page;
+
+ err = -ENOMEM;
+ page = (void *)__get_free_page(GFP_NOFS);
+ if (unlikely(!page))
+ goto out;
+
+ err = 0;
+ bend = au_sbend(sb);
+ for (bindex = 0; !err && bindex <= bend; bindex++)
+ if (!bindex || is_sb_shared(sb, bindex, bindex - 1) < 0)
+ err = do_xib_restore
+ (sb, au_sbr(sb, bindex)->br_xino.xi_file, page);
+ else
+ AuDbg("b%d\n", bindex);
+ free_page((unsigned long)page);
+
+out:
+ return err;
+}
+
+int au_xib_trunc(struct super_block *sb)
+{
+ int err;
+ ssize_t sz;
+ loff_t pos;
+ struct au_xino_lock_dir ldir;
+ struct au_sbinfo *sbinfo;
+ unsigned long *p;
+ struct file *file;
+
+ SiMustWriteLock(sb);
+
+ err = 0;
+ sbinfo = au_sbi(sb);
+ if (!au_opt_test(sbinfo->si_mntflags, XINO))
+ goto out;
+
+ file = sbinfo->si_xib;
+ if (i_size_read(file->f_dentry->d_inode) <= PAGE_SIZE)
+ goto out;
+
+ au_xino_lock_dir(sb, file, &ldir);
+ /* mnt_want_write() is unnecessary here */
+ file = au_xino_create2(sbinfo->si_xib, NULL);
+ au_xino_unlock_dir(&ldir);
+ err = PTR_ERR(file);
+ if (IS_ERR(file))
+ goto out;
+ fput(sbinfo->si_xib);
+ sbinfo->si_xib = file;
+
+ p = sbinfo->si_xib_buf;
+ memset(p, 0, PAGE_SIZE);
+ pos = 0;
+ sz = xino_fwrite(sbinfo->si_xwrite, sbinfo->si_xib, p, PAGE_SIZE, &pos);
+ if (unlikely(sz != PAGE_SIZE)) {
+ err = sz;
+ AuIOErr("err %d\n", err);
+ if (sz >= 0)
+ err = -EIO;
+ goto out;
+ }
+
+ mutex_lock(&sbinfo->si_xib_mtx);
+ /* mnt_want_write() is unnecessary here */
+ err = xib_restore(sb);
+ mutex_unlock(&sbinfo->si_xib_mtx);
+
+out:
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * xino mount option handlers
+ */
+static au_readf_t find_readf(struct file *h_file)
+{
+ const struct file_operations *fop = h_file->f_op;
+
+ if (fop) {
+ if (fop->read)
+ return fop->read;
+ if (fop->aio_read)
+ return do_sync_read;
+ }
+ return ERR_PTR(-ENOSYS);
+}
+
+static au_writef_t find_writef(struct file *h_file)
+{
+ const struct file_operations *fop = h_file->f_op;
+
+ if (fop) {
+ if (fop->write)
+ return fop->write;
+ if (fop->aio_write)
+ return do_sync_write;
+ }
+ return ERR_PTR(-ENOSYS);
+}
+
+/* xino bitmap */
+static void xino_clear_xib(struct super_block *sb)
+{
+ struct au_sbinfo *sbinfo;
+
+ SiMustWriteLock(sb);
+
+ sbinfo = au_sbi(sb);
+ sbinfo->si_xread = NULL;
+ sbinfo->si_xwrite = NULL;
+ if (sbinfo->si_xib)
+ fput(sbinfo->si_xib);
+ sbinfo->si_xib = NULL;
+ free_page((unsigned long)sbinfo->si_xib_buf);
+ sbinfo->si_xib_buf = NULL;
+}
+
+static int au_xino_set_xib(struct super_block *sb, struct file *base)
+{
+ int err;
+ loff_t pos;
+ struct au_sbinfo *sbinfo;
+ struct file *file;
+
+ SiMustWriteLock(sb);
+
+ sbinfo = au_sbi(sb);
+ file = au_xino_create2(base, sbinfo->si_xib);
+ err = PTR_ERR(file);
+ if (IS_ERR(file))
+ goto out;
+ if (sbinfo->si_xib)
+ fput(sbinfo->si_xib);
+ sbinfo->si_xib = file;
+ sbinfo->si_xread = find_readf(file);
+ sbinfo->si_xwrite = find_writef(file);
+
+ err = -ENOMEM;
+ if (!sbinfo->si_xib_buf)
+ sbinfo->si_xib_buf = (void *)get_zeroed_page(GFP_NOFS);
+ if (unlikely(!sbinfo->si_xib_buf))
+ goto out_unset;
+
+ sbinfo->si_xib_last_pindex = 0;
+ sbinfo->si_xib_next_bit = 0;
+ if (i_size_read(file->f_dentry->d_inode) < PAGE_SIZE) {
+ pos = 0;
+ err = xino_fwrite(sbinfo->si_xwrite, file, sbinfo->si_xib_buf,
+ PAGE_SIZE, &pos);
+ if (unlikely(err != PAGE_SIZE))
+ goto out_free;
+ }
+ err = 0;
+ goto out; /* success */
+
+out_free:
+ free_page((unsigned long)sbinfo->si_xib_buf);
+ sbinfo->si_xib_buf = NULL;
+ if (err >= 0)
+ err = -EIO;
+out_unset:
+ fput(sbinfo->si_xib);
+ sbinfo->si_xib = NULL;
+ sbinfo->si_xread = NULL;
+ sbinfo->si_xwrite = NULL;
+out:
+ return err;
+}
+
+/* xino for each branch */
+static void xino_clear_br(struct super_block *sb)
+{
+ aufs_bindex_t bindex, bend;
+ struct au_branch *br;
+
+ bend = au_sbend(sb);
+ for (bindex = 0; bindex <= bend; bindex++) {
+ br = au_sbr(sb, bindex);
+ if (!br || !br->br_xino.xi_file)
+ continue;
+
+ fput(br->br_xino.xi_file);
+ br->br_xino.xi_file = NULL;
+ }
+}
+
+static int au_xino_set_br(struct super_block *sb, struct file *base)
+{
+ int err;
+ ino_t ino;
+ aufs_bindex_t bindex, bend, bshared;
+ struct {
+ struct file *old, *new;
+ } *fpair, *p;
+ struct au_branch *br;
+ struct inode *inode;
+ au_writef_t writef;
+
+ SiMustWriteLock(sb);
+
+ err = -ENOMEM;
+ bend = au_sbend(sb);
+ fpair = kcalloc(bend + 1, sizeof(*fpair), GFP_NOFS);
+ if (unlikely(!fpair))
+ goto out;
+
+ inode = sb->s_root->d_inode;
+ ino = AUFS_ROOT_INO;
+ writef = au_sbi(sb)->si_xwrite;
+ for (bindex = 0, p = fpair; bindex <= bend; bindex++, p++) {
+ br = au_sbr(sb, bindex);
+ bshared = is_sb_shared(sb, bindex, bindex - 1);
+ if (bshared >= 0) {
+ /* shared xino */
+ *p = fpair[bshared];
+ get_file(p->new);
+ }
+
+ if (!p->new) {
+ /* new xino */
+ p->old = br->br_xino.xi_file;
+ p->new = au_xino_create2(base, br->br_xino.xi_file);
+ err = PTR_ERR(p->new);
+ if (IS_ERR(p->new)) {
+ p->new = NULL;
+ goto out_pair;
+ }
+ }
+
+ err = au_xino_do_write(writef, p->new,
+ au_h_iptr(inode, bindex)->i_ino, ino);
+ if (unlikely(err))
+ goto out_pair;
+ }
+
+ for (bindex = 0, p = fpair; bindex <= bend; bindex++, p++) {
+ br = au_sbr(sb, bindex);
+ if (br->br_xino.xi_file)
+ fput(br->br_xino.xi_file);
+ get_file(p->new);
+ br->br_xino.xi_file = p->new;
+ }
+
+out_pair:
+ for (bindex = 0, p = fpair; bindex <= bend; bindex++, p++)
+ if (p->new)
+ fput(p->new);
+ else
+ break;
+ kfree(fpair);
+out:
+ return err;
+}
+
+void au_xino_clr(struct super_block *sb)
+{
+ struct au_sbinfo *sbinfo;
+
+ au_xigen_clr(sb);
+ xino_clear_xib(sb);
+ xino_clear_br(sb);
+ sbinfo = au_sbi(sb);
+ /* lvalue, do not call au_mntflags() */
+ au_opt_clr(sbinfo->si_mntflags, XINO);
+}
+
+int au_xino_set(struct super_block *sb, struct au_opt_xino *xino, int remount)
+{
+ int err, skip;
+ struct dentry *parent, *cur_parent;
+ struct qstr *dname, *cur_name;
+ struct file *cur_xino;
+ struct inode *dir;
+ struct au_sbinfo *sbinfo;
+
+ SiMustWriteLock(sb);
+
+ err = 0;
+ sbinfo = au_sbi(sb);
+ parent = dget_parent(xino->file->f_dentry);
+ if (remount) {
+ skip = 0;
+ dname = &xino->file->f_dentry->d_name;
+ cur_xino = sbinfo->si_xib;
+ if (cur_xino) {
+ cur_parent = dget_parent(cur_xino->f_dentry);
+ cur_name = &cur_xino->f_dentry->d_name;
+ skip = (cur_parent == parent
+ && dname->len == cur_name->len
+ && !memcmp(dname->name, cur_name->name,
+ dname->len));
+ dput(cur_parent);
+ }
+ if (skip)
+ goto out;
+ }
+
+ au_opt_set(sbinfo->si_mntflags, XINO);
+ dir = parent->d_inode;
+ mutex_lock_nested(&dir->i_mutex, AuLsc_I_PARENT);
+ /* mnt_want_write() is unnecessary here */
+ err = au_xino_set_xib(sb, xino->file);
+ if (!err)
+ err = au_xigen_set(sb, xino->file);
+ if (!err)
+ err = au_xino_set_br(sb, xino->file);
+ mutex_unlock(&dir->i_mutex);
+ if (!err)
+ goto out; /* success */
+
+ /* reset all */
+ AuIOErr("failed creating xino(%d).\n", err);
+
+out:
+ dput(parent);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * create a xinofile at the default place/path.
+ */
+struct file *au_xino_def(struct super_block *sb)
+{
+ struct file *file;
+ char *page, *p;
+ struct au_branch *br;
+ struct super_block *h_sb;
+ struct path path;
+ aufs_bindex_t bend, bindex, bwr;
+
+ br = NULL;
+ bend = au_sbend(sb);
+ bwr = -1;
+ for (bindex = 0; bindex <= bend; bindex++) {
+ br = au_sbr(sb, bindex);
+ if (au_br_writable(br->br_perm)
+ && !au_test_fs_bad_xino(br->br_mnt->mnt_sb)) {
+ bwr = bindex;
+ break;
+ }
+ }
+
+ if (bwr >= 0) {
+ file = ERR_PTR(-ENOMEM);
+ page = __getname_gfp(GFP_NOFS);
+ if (unlikely(!page))
+ goto out;
+ path.mnt = br->br_mnt;
+ path.dentry = au_h_dptr(sb->s_root, bwr);
+ p = d_path(&path, page, PATH_MAX - sizeof(AUFS_XINO_FNAME));
+ file = (void *)p;
+ if (!IS_ERR(p)) {
+ strcat(p, "/" AUFS_XINO_FNAME);
+ AuDbg("%s\n", p);
+ file = au_xino_create(sb, p, /*silent*/0);
+ if (!IS_ERR(file))
+ au_xino_brid_set(sb, br->br_id);
+ }
+ __putname(page);
+ } else {
+ file = au_xino_create(sb, AUFS_XINO_DEFPATH, /*silent*/0);
+ if (IS_ERR(file))
+ goto out;
+ h_sb = file->f_dentry->d_sb;
+ if (unlikely(au_test_fs_bad_xino(h_sb))) {
+ pr_err("xino doesn't support %s(%s)\n",
+ AUFS_XINO_DEFPATH, au_sbtype(h_sb));
+ fput(file);
+ file = ERR_PTR(-EINVAL);
+ }
+ if (!IS_ERR(file))
+ au_xino_brid_set(sb, -1);
+ }
+
+out:
+ return file;
+}
+
+/* ---------------------------------------------------------------------- */
+
+int au_xino_path(struct seq_file *seq, struct file *file)
+{
+ int err;
+
+ err = au_seq_path(seq, &file->f_path);
+ if (unlikely(err < 0))
+ goto out;
+
+ err = 0;
+#define Deleted "\\040(deleted)"
+ seq->count -= sizeof(Deleted) - 1;
+ AuDebugOn(memcmp(seq->buf + seq->count, Deleted,
+ sizeof(Deleted) - 1));
+#undef Deleted
+
+out:
+ return err;
+}
diff -urN a/include/linux/aufs_type.h b/include/linux/aufs_type.h
--- a/include/linux/aufs_type.h 1969-12-31 17:00:00.000000000 -0700
+++ b/include/linux/aufs_type.h 2012-01-21 19:14:31.000000000 -0700
@@ -0,0 +1,233 @@
+/*
+ * Copyright (C) 2005-2012 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef __AUFS_TYPE_H__
+#define __AUFS_TYPE_H__
+
+#define AUFS_NAME "aufs"
+
+#ifdef __KERNEL__
+/*
+ * define it before including all other headers.
+ * sched.h may use pr_* macros before defining "current", so define the
+ * no-current version first, and re-define later.
+ */
+#define pr_fmt(fmt) AUFS_NAME " %s:%d: " fmt, __func__, __LINE__
+#include <linux/sched.h>
+#undef pr_fmt
+#define pr_fmt(fmt) AUFS_NAME " %s:%d:%s[%d]: " fmt, \
+ __func__, __LINE__, current->comm, current->pid
+#else
+#include <stdint.h>
+#include <sys/types.h>
+#endif /* __KERNEL__ */
+
+#include <linux/limits.h>
+
+#define AUFS_VERSION "3.2-20120109"
+
+/* todo? move this to linux-2.6.19/include/magic.h */
+#define AUFS_SUPER_MAGIC ('a' << 24 | 'u' << 16 | 'f' << 8 | 's')
+
+/* ---------------------------------------------------------------------- */
+
+#ifdef CONFIG_AUFS_BRANCH_MAX_127
+typedef int8_t aufs_bindex_t;
+#define AUFS_BRANCH_MAX 127
+#else
+typedef int16_t aufs_bindex_t;
+#ifdef CONFIG_AUFS_BRANCH_MAX_511
+#define AUFS_BRANCH_MAX 511
+#elif defined(CONFIG_AUFS_BRANCH_MAX_1023)
+#define AUFS_BRANCH_MAX 1023
+#elif defined(CONFIG_AUFS_BRANCH_MAX_32767)
+#define AUFS_BRANCH_MAX 32767
+#endif
+#endif
+
+#ifdef __KERNEL__
+#ifndef AUFS_BRANCH_MAX
+#error unknown CONFIG_AUFS_BRANCH_MAX value
+#endif
+#endif /* __KERNEL__ */
+
+/* ---------------------------------------------------------------------- */
+
+#define AUFS_FSTYPE AUFS_NAME
+
+#define AUFS_ROOT_INO 2
+#define AUFS_FIRST_INO 11
+
+#define AUFS_WH_PFX ".wh."
+#define AUFS_WH_PFX_LEN ((int)sizeof(AUFS_WH_PFX) - 1)
+#define AUFS_WH_TMP_LEN 4
+/* a limit for rmdir/rename a dir */
+#define AUFS_MAX_NAMELEN (NAME_MAX \
+ - AUFS_WH_PFX_LEN * 2 /* doubly whiteouted */\
+ - 1 /* dot */\
+ - AUFS_WH_TMP_LEN) /* hex */
+#define AUFS_XINO_FNAME "." AUFS_NAME ".xino"
+#define AUFS_XINO_DEFPATH "/tmp/" AUFS_XINO_FNAME
+#define AUFS_XINO_TRUNC_INIT 64 /* blocks */
+#define AUFS_XINO_TRUNC_STEP 4 /* blocks */
+#define AUFS_DIRWH_DEF 3
+#define AUFS_RDCACHE_DEF 10 /* seconds */
+#define AUFS_RDCACHE_MAX 3600 /* seconds */
+#define AUFS_RDBLK_DEF 512 /* bytes */
+#define AUFS_RDHASH_DEF 32
+#define AUFS_WKQ_NAME AUFS_NAME "d"
+#define AUFS_MFS_DEF_SEC 30 /* seconds */
+#define AUFS_MFS_MAX_SEC 3600 /* seconds */
+#define AUFS_PLINK_WARN 100 /* number of plinks */
+
+/* pseudo-link maintenace under /proc */
+#define AUFS_PLINK_MAINT_NAME "plink_maint"
+#define AUFS_PLINK_MAINT_DIR "fs/" AUFS_NAME
+#define AUFS_PLINK_MAINT_PATH AUFS_PLINK_MAINT_DIR "/" AUFS_PLINK_MAINT_NAME
+
+#define AUFS_DIROPQ_NAME AUFS_WH_PFX ".opq" /* whiteouted doubly */
+#define AUFS_WH_DIROPQ AUFS_WH_PFX AUFS_DIROPQ_NAME
+
+#define AUFS_BASE_NAME AUFS_WH_PFX AUFS_NAME
+#define AUFS_PLINKDIR_NAME AUFS_WH_PFX "plnk"
+#define AUFS_ORPHDIR_NAME AUFS_WH_PFX "orph"
+
+/* doubly whiteouted */
+#define AUFS_WH_BASE AUFS_WH_PFX AUFS_BASE_NAME
+#define AUFS_WH_PLINKDIR AUFS_WH_PFX AUFS_PLINKDIR_NAME
+#define AUFS_WH_ORPHDIR AUFS_WH_PFX AUFS_ORPHDIR_NAME
+
+/* branch permissions and attributes */
+#define AUFS_BRPERM_RW "rw"
+#define AUFS_BRPERM_RO "ro"
+#define AUFS_BRPERM_RR "rr"
+#define AUFS_BRRATTR_WH "wh"
+#define AUFS_BRWATTR_NLWH "nolwh"
+
+/* ---------------------------------------------------------------------- */
+
+/* ioctl */
+enum {
+ /* readdir in userspace */
+ AuCtl_RDU,
+ AuCtl_RDU_INO,
+
+ /* pathconf wrapper */
+ AuCtl_WBR_FD,
+
+ /* busy inode */
+ AuCtl_IBUSY
+};
+
+/* borrowed from linux/include/linux/kernel.h */
+#ifndef ALIGN
+#define ALIGN(x, a) __ALIGN_MASK(x, (typeof(x))(a)-1)
+#define __ALIGN_MASK(x, mask) (((x)+(mask))&~(mask))
+#endif
+
+/* borrowed from linux/include/linux/compiler-gcc3.h */
+#ifndef __aligned
+#define __aligned(x) __attribute__((aligned(x)))
+#endif
+
+#ifdef __KERNEL__
+#ifndef __packed
+#define __packed __attribute__((packed))
+#endif
+#endif
+
+struct au_rdu_cookie {
+ uint64_t h_pos;
+ int16_t bindex;
+ uint8_t flags;
+ uint8_t pad;
+ uint32_t generation;
+} __aligned(8);
+
+struct au_rdu_ent {
+ uint64_t ino;
+ int16_t bindex;
+ uint8_t type;
+ uint8_t nlen;
+ uint8_t wh;
+ char name[0];
+} __aligned(8);
+
+static inline int au_rdu_len(int nlen)
+{
+ /* include the terminating NULL */
+ return ALIGN(sizeof(struct au_rdu_ent) + nlen + 1,
+ sizeof(uint64_t));
+}
+
+union au_rdu_ent_ul {
+ struct au_rdu_ent __user *e;
+ uint64_t ul;
+};
+
+enum {
+ AufsCtlRduV_SZ,
+ AufsCtlRduV_End
+};
+
+struct aufs_rdu {
+ /* input */
+ union {
+ uint64_t sz; /* AuCtl_RDU */
+ uint64_t nent; /* AuCtl_RDU_INO */
+ };
+ union au_rdu_ent_ul ent;
+ uint16_t verify[AufsCtlRduV_End];
+
+ /* input/output */
+ uint32_t blk;
+
+ /* output */
+ union au_rdu_ent_ul tail;
+ /* number of entries which were added in a single call */
+ uint64_t rent;
+ uint8_t full;
+ uint8_t shwh;
+
+ struct au_rdu_cookie cookie;
+} __aligned(8);
+
+/* ---------------------------------------------------------------------- */
+
+struct aufs_wbr_fd {
+ uint32_t oflags;
+ int16_t brid;
+} __aligned(8);
+
+/* ---------------------------------------------------------------------- */
+
+struct aufs_ibusy {
+ uint64_t ino, h_ino;
+ int16_t bindex;
+} __aligned(8);
+
+/* ---------------------------------------------------------------------- */
+
+#define AuCtlType 'A'
+#define AUFS_CTL_RDU _IOWR(AuCtlType, AuCtl_RDU, struct aufs_rdu)
+#define AUFS_CTL_RDU_INO _IOWR(AuCtlType, AuCtl_RDU_INO, struct aufs_rdu)
+#define AUFS_CTL_WBR_FD _IOW(AuCtlType, AuCtl_WBR_FD, \
+ struct aufs_wbr_fd)
+#define AUFS_CTL_IBUSY _IOWR(AuCtlType, AuCtl_IBUSY, struct aufs_ibusy)
+
+#endif /* __AUFS_TYPE_H__ */
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