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authorTrond Myklebust <Trond.Myklebust@netapp.com>2006-06-29 20:38:34 (GMT)
committerTrond Myklebust <Trond.Myklebust@netapp.com>2006-07-05 17:13:17 (GMT)
commit9b07357490e5c7a1c3c2b6f4679d7ee4b4185ecd (patch)
tree020b1e8ed07374d45ae2691cae8ed550ef123137 /fs
parentf475ae957db66650db66916c62604ac27409d884 (diff)
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/lockd/clntproc.c18
-rw-r--r--fs/nfs/nfs4proc.c31
2 files changed, 22 insertions, 27 deletions
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 @@ static void nlmclnt_locks_init_private(struct file_lock *fl, struct nlm_host *ho
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 @@ static void do_vfs_lock(struct file_lock *fl)
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 @@ again:
}
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 @@ nlmclnt_unlock(struct nlm_rqst *req, struct file_lock *fl)
{
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 @@ nlmclnt_unlock(struct nlm_rqst *req, struct file_lock *fl)
if (status < 0)
goto out;
- status = 0;
if (resp->status == NLM_LCK_GRANTED)
goto out;
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index b4916b0..b8c6375 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -3144,9 +3144,6 @@ static int do_vfs_lock(struct file *file, struct file_lock *fl)
default:
BUG();
}
- if (res < 0)
- printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n",
- __FUNCTION__);
return res;
}
@@ -3258,8 +3255,6 @@ static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
return ERR_PTR(-ENOMEM);
}
- /* Unlock _before_ we do the RPC call */
- do_vfs_lock(fl->fl_file, fl);
return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
}
@@ -3270,30 +3265,28 @@ static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *
struct rpc_task *task;
int status = 0;
- /* Is this a delegated lock? */
- if (test_bit(NFS_DELEGATED_STATE, &state->flags))
- goto out_unlock;
- /* Is this open_owner holding any locks on the server? */
- if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
- goto out_unlock;
-
status = nfs4_set_lock_state(state, request);
+ /* Unlock _before_ we do the RPC call */
+ request->fl_flags |= FL_EXISTS;
+ if (do_vfs_lock(request->fl_file, request) == -ENOENT)
+ goto out;
if (status != 0)
- goto out_unlock;
+ goto out;
+ /* Is this a delegated lock? */
+ if (test_bit(NFS_DELEGATED_STATE, &state->flags))
+ goto out;
lsp = request->fl_u.nfs4_fl.owner;
- status = -ENOMEM;
seqid = nfs_alloc_seqid(&lsp->ls_seqid);
+ status = -ENOMEM;
if (seqid == NULL)
- goto out_unlock;
+ goto out;
task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
status = PTR_ERR(task);
if (IS_ERR(task))
- goto out_unlock;
+ goto out;
status = nfs4_wait_for_completion_rpc_task(task);
rpc_release_task(task);
- return status;
-out_unlock:
- do_vfs_lock(request->fl_file, request);
+out:
return status;
}

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