rpc: add rpc_queue_empty function

Signed-off-by: Alexandros Batsakis <batsakis@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
git-mirror · Dec 15, 2009 · 48f1861 · 48f1861
1 parent afe6c27
commit 48f1861
Show file tree

Hide file tree

Showing 2 changed files with 15 additions and 0 deletions.
diff --git a/include/linux/sunrpc/sched.h b/include/linux/sunrpc/sched.h
@@ -229,6 +229,7 @@ void		rpc_wake_up_queued_task(struct rpc_wait_queue *,
 void		rpc_wake_up(struct rpc_wait_queue *);
 struct rpc_task *rpc_wake_up_next(struct rpc_wait_queue *);
 void		rpc_wake_up_status(struct rpc_wait_queue *, int);
+int		rpc_queue_empty(struct rpc_wait_queue *);
 void		rpc_delay(struct rpc_task *, unsigned long);
 void *		rpc_malloc(struct rpc_task *, size_t);
 void		rpc_free(void *);

diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c
@@ -384,6 +384,20 @@ static void rpc_wake_up_task_queue_locked(struct rpc_wait_queue *queue, struct r
 		__rpc_do_wake_up_task(queue, task);
 }
 
+/*
+ * Tests whether rpc queue is empty
+ */
+int rpc_queue_empty(struct rpc_wait_queue *queue)
+{
+	int res;
+
+	spin_lock_bh(&queue->lock);
+	res = queue->qlen;
+	spin_unlock_bh(&queue->lock);
+	return (res == 0);
+}
+EXPORT_SYMBOL_GPL(rpc_queue_empty);
+
 /*
  * Wake up a task on a specific queue
  */