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Commit 9b073574 authored by Trond Myklebust's avatar Trond Myklebust
Browse files

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: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent f475ae95

fs/lockd/clntproc.c

+10 −8
Original line number Diff line number Diff line
@@ -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;

fs/nfs/nfs4proc.c

+12 −19
Original line number Diff line number Diff line
@@ -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;

}