PKGBUILDs/core/systemd/0001-udev-exclude-device-mapper-from-block-device-ownersh.patch

From e918a1b5a94f270186dca59156354acd2a596494 Mon Sep 17 00:00:00 2001
From: Kay Sievers <kay@vrfy.org>
Date: Tue, 3 Jun 2014 16:49:38 +0200
Subject: [PATCH] udev: exclude device-mapper from block device ownership event
 locking

---
 src/udev/udevd.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/udev/udevd.c b/src/udev/udevd.c
index 819ea3b..6c05104 100644
--- a/src/udev/udevd.c
+++ b/src/udev/udevd.c
@@ -290,7 +290,19 @@ static void worker_new(struct event *event)
                          * acquired the lock, the external process will block until
                          * udev has finished its event handling.
                          */
-                        if (streq_ptr("block", udev_device_get_subsystem(dev))) {
+
+                        /*
+                         * <kabi_> since we make check - device seems unused - we try
+                         *         ioctl to deactivate - and device is found to be opened
+                         * <kay> sure, you try to take a write lock
+                         * <kay> if you get it udev is out
+                         * <kay> if you can't get it, udev is busy
+                         * <kabi_> we cannot deactivate openned device  (as it is in-use)
+                         * <kay> maybe we should just exclude dm from that thing entirely
+                         * <kabi_> IMHO this sounds like a good plan for this moment
+                         */
+                        if (streq_ptr("block", udev_device_get_subsystem(dev)) &&
+                            !startswith("dm-", udev_device_get_sysname(dev))) {
                                 struct udev_device *d = dev;
 
                                 if (streq_ptr("partition", udev_device_get_devtype(d)))
-- 
2.0.0