The patch titled
Subject: mqueue: sys_mq_open: do not call mnt_drop_write() if read-only
has been added to the -mm tree. Its filename is
mqueue-sys_mq_open-do-not-call-mnt_drop_write-if-read-only.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Subject: 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.
Signed-off-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Cc: Doug Ledford <dledford@xxxxxxxxxx>
Cc: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
ipc/mqueue.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff -puN ipc/mqueue.c~mqueue-sys_mq_open-do-not-call-mnt_drop_write-if-read-only ipc/mqueue.c
--- a/ipc/mqueue.c~mqueue-sys_mq_open-do-not-call-mnt_drop_write-if-read-only
+++ a/ipc/mqueue.c
@@ -840,7 +840,8 @@ out_putfd:
fd = error;
}
mutex_unlock(&root->d_inode->i_mutex);
- mnt_drop_write(mnt);
+ if (!ro)
+ mnt_drop_write(mnt);
out_putname:
putname(name);
return fd;
_
Patches currently in -mm which might be from vdavydov@xxxxxxxxxxxxx are
mqueue-sys_mq_open-do-not-call-mnt_drop_write-if-read-only.patch
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