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NLM,NFSv4: Don't put UNLOCK requests on the wire unless we hold a lock

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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>
This commit is contained in:
Trond Myklebust 2006-06-29 16:38:34 -04:00
parent f475ae957d
commit 9b07357490
2 changed files with 22 additions and 27 deletions
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18
fs/lockd/clntproc.c
View File

@ -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;

31
fs/nfs/nfs4proc.c
View File

@ -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;
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;
/* 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);
if (status != 0)
goto out_unlock;
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;
}