rpc: add rpc_queue_empty function

Signed-off-by: Alexandros Batsakis <batsakis@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

2 files changed, 15 insertions, 0 deletions

diff --git a/include/linux/sunrpc/sched.h b/include/linux/sunrpc/sched.h
index 1906782ec86b..9157405f9320 100644
--- 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
index cef74ba0666c..89ea8e69ec78 100644
--- a/net/sunrpc/sched.c
+++ b/net/sunrpc/sched.c
@@ -385,6 +385,20 @@ static void rpc_wake_up_task_queue_locked(struct rpc_wait_queue *queue, struct r
 }
 
 /*
+ * 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
  */
 void rpc_wake_up_queued_task(struct rpc_wait_queue *queue, struct rpc_task *task)