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Commit f904be9c authored by Bryan Schumaker's avatar Bryan Schumaker Committed by J. Bruce Fields
Browse files

lockd: Mostly remove BKL from the server 



This patch removes all but one call to lock_kernel() from the server.

Signed-off-by: default avatarBryan Schumaker <bjschuma@netapp.com>
Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent e7f483ea

fs/lockd/svc4proc.c

+0 −2
Original line number Diff line number Diff line
@@ -230,9 +230,7 @@ static void nlm4svc_callback_exit(struct rpc_task *task, void *data) 


static void nlm4svc_callback_release(void *data)

{

	lock_kernel();

	nlm_release_call(data);

	unlock_kernel();

}



static const struct rpc_call_ops nlm4svc_callback_ops = {

fs/lockd/svclock.c

+21 −10
Original line number Diff line number Diff line
@@ -52,12 +52,13 @@ static const struct rpc_call_ops nlmsvc_grant_ops; 
 * The list of blocked locks to retry

 */

static LIST_HEAD(nlm_blocked);

static DEFINE_SPINLOCK(nlm_blocked_lock);



/*

 * Insert a blocked lock into the global list

 */

static void

nlmsvc_insert_block(struct nlm_block *block, unsigned long when)

nlmsvc_insert_block_locked(struct nlm_block *block, unsigned long when)

{

	struct nlm_block *b;

	struct list_head *pos;
@@ -87,6 +88,13 @@ nlmsvc_insert_block(struct nlm_block *block, unsigned long when) 
	block->b_when = when;

}



static void nlmsvc_insert_block(struct nlm_block *block, unsigned long when)

{

	spin_lock(&nlm_blocked_lock);

	nlmsvc_insert_block_locked(block, when);

	spin_unlock(&nlm_blocked_lock);

}



/*

 * Remove a block from the global list

 */
@@ -94,7 +102,9 @@ static inline void 
nlmsvc_remove_block(struct nlm_block *block)

{

	if (!list_empty(&block->b_list)) {

		spin_lock(&nlm_blocked_lock);

		list_del_init(&block->b_list);

		spin_unlock(&nlm_blocked_lock);

		nlmsvc_release_block(block);

	}

}
@@ -651,7 +661,7 @@ static int nlmsvc_grant_deferred(struct file_lock *fl, struct file_lock *conf, 
	struct nlm_block *block;

	int rc = -ENOENT;



	lock_kernel();

	spin_lock(&nlm_blocked_lock);

	list_for_each_entry(block, &nlm_blocked, b_list) {

		if (nlm_compare_locks(&block->b_call->a_args.lock.fl, fl)) {

			dprintk("lockd: nlmsvc_notify_blocked block %p flags %d\n",
@@ -665,13 +675,13 @@ static int nlmsvc_grant_deferred(struct file_lock *fl, struct file_lock *conf, 
			} else if (result == 0)

				block->b_granted = 1;



			nlmsvc_insert_block(block, 0);

			nlmsvc_insert_block_locked(block, 0);

			svc_wake_up(block->b_daemon);

			rc = 0;

			break;

		}

	}

	unlock_kernel();

	spin_unlock(&nlm_blocked_lock);

	if (rc == -ENOENT)

		printk(KERN_WARNING "lockd: grant for unknown block\n");

	return rc;
@@ -803,7 +813,7 @@ static void nlmsvc_grant_callback(struct rpc_task *task, void *data) 


	dprintk("lockd: GRANT_MSG RPC callback\n");



	lock_kernel();

	spin_lock(&nlm_blocked_lock);

	/* if the block is not on a list at this point then it has

	 * been invalidated. Don't try to requeue it.

	 *
@@ -825,19 +835,20 @@ static void nlmsvc_grant_callback(struct rpc_task *task, void *data) 
		/* Call was successful, now wait for client callback */

		timeout = 60 * HZ;

	}

	nlmsvc_insert_block(block, timeout);

	nlmsvc_insert_block_locked(block, timeout);

	svc_wake_up(block->b_daemon);

out:

	unlock_kernel();

	spin_unlock(&nlm_blocked_lock);

}



/*

 * FIXME: nlmsvc_release_block() grabs a mutex.  This is not allowed for an

 * .rpc_release rpc_call_op

 */

static void nlmsvc_grant_release(void *data)

{

	struct nlm_rqst		*call = data;



	lock_kernel();

	nlmsvc_release_block(call->a_block);

	unlock_kernel();

}



static const struct rpc_call_ops nlmsvc_grant_ops = {

fs/lockd/svcproc.c

+0 −2
Original line number Diff line number Diff line
@@ -260,9 +260,7 @@ static void nlmsvc_callback_exit(struct rpc_task *task, void *data) 


static void nlmsvc_callback_release(void *data)

{

	lock_kernel();

	nlm_release_call(data);

	unlock_kernel();

}



static const struct rpc_call_ops nlmsvc_callback_ops = {