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authorTrond Myklebust <Trond.Myklebust@netapp.com>2006-03-13 21:20:49 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-14 07:57:18 -0800
commit30f4e20a0d3492668f5065af582b5af2d1e4256b (patch)
tree518b47635c091814b35caf128f7be361c595aab1
parente6d83d55698b73b4d5d55d3d7715a4c26030d577 (diff)
[PATCH] NLM: Ensure we do not Oops in the case of an unlock
In theory, NLM specs assure us that the server will only reply LCK_GRANTED or LCK_DENIED_GRACE_PERIOD to our NLM_UNLOCK request. In practice, we should not assume this to be the case, and the code will currently Oops if we do. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--fs/lockd/clntproc.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/fs/lockd/clntproc.c b/fs/lockd/clntproc.c
index 220058d8616..970b6a6aa33 100644
--- a/fs/lockd/clntproc.c
+++ b/fs/lockd/clntproc.c
@@ -662,12 +662,18 @@ nlmclnt_unlock(struct nlm_rqst *req, struct file_lock *fl)
* reclaimed while we're stuck in the unlock call. */
fl->fl_u.nfs_fl.flags &= ~NFS_LCK_GRANTED;
+ /*
+ * Note: the server is supposed to either grant us the unlock
+ * request, or to deny it with NLM_LCK_DENIED_GRACE_PERIOD. In either
+ * case, we want to unlock.
+ */
+ do_vfs_lock(fl);
+
if (req->a_flags & RPC_TASK_ASYNC) {
status = nlmclnt_async_call(req, NLMPROC_UNLOCK,
&nlmclnt_unlock_ops);
/* Hrmf... Do the unlock early since locks_remove_posix()
* really expects us to free the lock synchronously */
- do_vfs_lock(fl);
if (status < 0) {
nlmclnt_release_lockargs(req);
kfree(req);
@@ -680,7 +686,6 @@ nlmclnt_unlock(struct nlm_rqst *req, struct file_lock *fl)
if (status < 0)
return status;
- do_vfs_lock(fl);
if (resp->status == NLM_LCK_GRANTED)
return 0;