VictoriaMetrics/lib/fs/fs_unix.go
2021-07-26 15:48:21 +03:00

60 lines
1.5 KiB
Go

//go:build linux || darwin || freebsd || openbsd
// +build linux darwin freebsd openbsd
package fs
import (
"fmt"
"os"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
"golang.org/x/sys/unix"
)
func mmap(fd int, length int) (data []byte, err error) {
return unix.Mmap(fd, 0, length, unix.PROT_READ, unix.MAP_SHARED)
}
func mUnmap(data []byte) error {
return unix.Munmap(data)
}
func mustSyncPath(path string) {
d, err := os.Open(path)
if err != nil {
logger.Panicf("FATAL: cannot open %q: %s", path, err)
}
if err := d.Sync(); err != nil {
_ = d.Close()
logger.Panicf("FATAL: cannot flush %q to storage: %s", path, err)
}
if err := d.Close(); err != nil {
logger.Panicf("FATAL: cannot close %q: %s", path, err)
}
}
func createFlockFile(flockFile string) (*os.File, error) {
flockF, err := os.Create(flockFile)
if err != nil {
return nil, fmt.Errorf("cannot create lock file %q: %w", flockFile, err)
}
if err := unix.Flock(int(flockF.Fd()), unix.LOCK_EX|unix.LOCK_NB); err != nil {
return nil, fmt.Errorf("cannot acquire lock on file %q: %w", flockFile, err)
}
return flockF, nil
}
func mustGetFreeSpace(path string) uint64 {
d, err := os.Open(path)
if err != nil {
logger.Panicf("FATAL: cannot determine free disk space on %q: %s", path, err)
}
defer MustClose(d)
fd := d.Fd()
var stat unix.Statfs_t
if err := unix.Fstatfs(int(fd), &stat); err != nil {
logger.Panicf("FATAL: cannot determine free disk space on %q: %s", path, err)
}
return freeSpace(stat)
}