picnoir
/
Systemd
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

loop-util: add api for locking the block device with flock()

This commit is contained in:
Lennart Poettering 2019-05-21 18:04:04 +02:00
parent c37878fced
commit 441ec80468
2 changed files with 15 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
src/shared/loop-util.c
View File

@ -3,6 +3,7 @@
#include <errno.h>
#include <fcntl.h>
#include <linux/loop.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include "alloc-util.h"
@ -233,3 +234,15 @@ int loop_device_refresh_size(LoopDevice *d, uint64_t offset, uint64_t size) {
return 0;
}
int loop_device_flock(LoopDevice *d, int operation) {
assert(d);
if (d->fd < 0)
return -EBADF;
if (flock(d->fd, operation) < 0)
return -errno;
return 0;
}

2
src/shared/loop-util.h
View File

@ -28,3 +28,5 @@ DEFINE_TRIVIAL_CLEANUP_FUNC(LoopDevice*, loop_device_unref);
void loop_device_relinquish(LoopDevice *d);
int loop_device_refresh_size(LoopDevice *d, uint64_t offset, uint64_t size);
int loop_device_flock(LoopDevice *d, int operation);