elevator: abstract out the activate and deactivate functions

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

block/elevator.c

@@ -269,6 +269,22 @@ void elevator_exit(elevator_t *e)
 
 EXPORT_SYMBOL(elevator_exit);
 
+static void elv_activate_rq(request_queue_t *q, struct request *rq)
+{
+	elevator_t *e = q->elevator;
+
+	if (e->ops->elevator_activate_req_fn)
+		e->ops->elevator_activate_req_fn(q, rq);
+}
+
+static void elv_deactivate_rq(request_queue_t *q, struct request *rq)
+{
+	elevator_t *e = q->elevator;
+
+	if (e->ops->elevator_deactivate_req_fn)
+		e->ops->elevator_deactivate_req_fn(q, rq);
+}
+
 static inline void __elv_rqhash_del(struct request *rq)
 {
 	hlist_del_init(&rq->hash);
@@ -498,16 +514,14 @@ void elv_merge_requests(request_queue_t *q, struct request *rq,
 
 void elv_requeue_request(request_queue_t *q, struct request *rq)
 {
-	elevator_t *e = q->elevator;
-
 	/*
 	 * it already went through dequeue, we need to decrement the
 	 * in_flight count again
 	 */
 	if (blk_account_rq(rq)) {
 		q->in_flight--;
-		if (blk_sorted_rq(rq) && e->ops->elevator_deactivate_req_fn)
-			e->ops->elevator_deactivate_req_fn(q, rq);
+		if (blk_sorted_rq(rq))
+			elv_deactivate_rq(q, rq);
 	}
 
 	rq->cmd_flags &= ~REQ_STARTED;
@@ -700,16 +714,13 @@ struct request *elv_next_request(request_queue_t *q)
 
 	while ((rq = __elv_next_request(q)) != NULL) {
 		if (!(rq->cmd_flags & REQ_STARTED)) {
-			elevator_t *e = q->elevator;
-
 			/*
 			 * This is the first time the device driver
 			 * sees this request (possibly after
 			 * requeueing).  Notify IO scheduler.
 			 */
-			if (blk_sorted_rq(rq) &&
-			    e->ops->elevator_activate_req_fn)
-				e->ops->elevator_activate_req_fn(q, rq);
+			if (blk_sorted_rq(rq))
+				elv_activate_rq(q, rq);
 
 			/*
 			 * just mark as started even if we don't start