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| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2006-03-14 06:20:49 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-14 16:57:18 +0100 |
| commit | 30f4e20a0d3492668f5065af582b5af2d1e4256b (patch) | |
| tree | 518b47635c091814b35caf128f7be361c595aab1 | |
| parent | [PATCH] SUNRPC: Fix potential deadlock in RPC code (diff) | |
| download | linux-30f4e20a0d3492668f5065af582b5af2d1e4256b.tar.xz linux-30f4e20a0d3492668f5065af582b5af2d1e4256b.zip | |
[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.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/fs/lockd/clntproc.c b/fs/lockd/clntproc.c index 220058d8616d..970b6a6aa337 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; |