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CIFS: Fix lock consistensy bug in cifs_setlk 

If we netogiate mandatory locking style, have a read lock and try
to set a write lock we end up with a write lock in vfs cache and
no lock in cifs lock cache - that's wrong. Fix it by returning
from cifs_setlk immediately if a error occurs during setting a lock.

Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Pavel Shilovsky 2012-11-22 18:56:39 +04:00 committed by Steve French
parent f152fd5fff
commit 21cb2d90c7
1 changed files with 5 additions and 3 deletions
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8
fs/cifs/file.c
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@ -1443,16 +1443,18 @@ cifs_setlk(struct file *file, struct file_lock *flock, __u32 type,
return -ENOMEM;
rc = cifs_lock_add_if(cfile, lock, wait_flag);
if (rc < 0)
if (rc < 0) {
kfree(lock);
if (rc <= 0)
return rc;
}
if (!rc)
goto out;
rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length,
type, 1, 0, wait_flag);
if (rc) {
kfree(lock);
goto out;
return rc;
}
cifs_lock_add(cfile, lock);