NLM,NFSv4: Don't put UNLOCK requests on the wire unless we hold a lock
Use the new behaviour of {flock,posix}_file_lock(F_UNLCK) to determine if
we held a lock, and only send the RPC request to the server if this was the
case.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/lockd/clntproc.c b/fs/lockd/clntproc.c
index 5980c45..24c691f 100644
--- a/fs/lockd/clntproc.c
+++ b/fs/lockd/clntproc.c
@@ -454,7 +454,7 @@
fl->fl_ops = &nlmclnt_lock_ops;
}
-static void do_vfs_lock(struct file_lock *fl)
+static int do_vfs_lock(struct file_lock *fl)
{
int res = 0;
switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
@@ -467,9 +467,7 @@
default:
BUG();
}
- if (res < 0)
- printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n",
- __FUNCTION__);
+ return res;
}
/*
@@ -541,7 +539,8 @@
}
fl->fl_flags |= FL_SLEEP;
/* Ensure the resulting lock will get added to granted list */
- do_vfs_lock(fl);
+ if (do_vfs_lock(fl) < 0)
+ printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
up_read(&host->h_rwsem);
}
status = nlm_stat_to_errno(resp->status);
@@ -606,15 +605,19 @@
{
struct nlm_host *host = req->a_host;
struct nlm_res *resp = &req->a_res;
- int status;
+ int status = 0;
/*
* 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.
*/
+ fl->fl_flags |= FL_EXISTS;
down_read(&host->h_rwsem);
- do_vfs_lock(fl);
+ if (do_vfs_lock(fl) == -ENOENT) {
+ up_read(&host->h_rwsem);
+ goto out;
+ }
up_read(&host->h_rwsem);
if (req->a_flags & RPC_TASK_ASYNC)
@@ -624,7 +627,6 @@
if (status < 0)
goto out;
- status = 0;
if (resp->status == NLM_LCK_GRANTED)
goto out;
