Vladimir Davydov 38d78e587d mqueue: sys_mq_open: do not call mnt_drop_write() if read-only ... mnt_drop_write() must be called only if mnt_want_write() succeeded, otherwise the mnt_writers counter will diverge. mnt_writers counters are used to check if remounting FS as read-only is OK, so after an extra mnt_drop_write() call, it would be impossible to remount mqueue FS as read-only. Besides, on umount a warning would be printed like this one: ===================================== [ BUG: bad unlock balance detected! ] 3.9.0-rc3 #5 Not tainted ------------------------------------- a.out/12486 is trying to release lock (sb_writers) at: mnt_drop_write+0x1f/0x30 but there are no more locks to release! Signed-off-by: Vladimir Davydov <vdavydov@parallels.com> Cc: Doug Ledford <dledford@redhat.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2013-03-22 16:41:21 -07:00
..
compat_mq.c
compat.c	selftests: IPC message queue copy feature test	2013-01-04 16:11:45 -08:00
ipc_sysctl.c	ipc: add sysctl to specify desired next object id	2013-01-04 16:11:45 -08:00
ipcns_notifier.c
Makefile
mq_sysctl.c
mqueue.c	mqueue: sys_mq_open: do not call mnt_drop_write() if read-only	2013-03-22 16:41:21 -07:00
msg.c	ipc: don't allocate a copy larger than max	2013-03-08 15:05:33 -08:00
msgutil.c	ipc: fix potential oops when src msg > 4k w/ MSG_COPY	2013-03-08 15:05:33 -08:00
namespace.c
sem.c
shm.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2013-02-26 20:16:07 -08:00
syscall.c
util.c	ipc: convert to idr_alloc()	2013-02-27 19:10:19 -08:00
util.h	ipc: introduce message queue copy feature	2013-01-04 16:11:45 -08:00