dm: cleanup methods that requeue requests

More often than not a request that is requeued _is_ mapped (meaning the
clone request is allocated and clone->q is initialized).  Rename
dm_requeue_unmapped_original_request() to avoid potential confusion due
to function name containing "unmapped".

Also, remove dm_requeue_unmapped_request() since callers can easily call
the dm_requeue_original_request() directly.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

drivers/md/dm.c

@@ -1113,8 +1113,8 @@ static void old_requeue_request(struct request *rq)
 	spin_unlock_irqrestore(q->queue_lock, flags);
 }
 
-static void dm_requeue_unmapped_original_request(struct mapped_device *md,
-						 struct request *rq)
+static void dm_requeue_original_request(struct mapped_device *md,
+					struct request *rq)
 {
 	int rw = rq_data_dir(rq);
 
@@ -1130,13 +1130,6 @@ static void dm_requeue_unmapped_original_request(struct mapped_device *md,
 	rq_completed(md, rw, false);
 }
 
-static void dm_requeue_unmapped_request(struct request *clone)
-{
-	struct dm_rq_target_io *tio = clone->end_io_data;
-
-	dm_requeue_unmapped_original_request(tio->md, tio->orig);
-}
-
 static void old_stop_queue(struct request_queue *q)
 {
 	unsigned long flags;
@@ -1200,7 +1193,7 @@ static void dm_done(struct request *clone, int error, bool mapped)
 		return;
 	else if (r == DM_ENDIO_REQUEUE)
 		/* The target wants to requeue the I/O */
-		dm_requeue_unmapped_request(clone);
+		dm_requeue_original_request(tio->md, tio->orig);
 	else {
 		DMWARN("unimplemented target endio return value: %d", r);
 		BUG();
@@ -1910,7 +1903,7 @@ static int map_request(struct dm_rq_target_io *tio, struct request *rq,
 		break;
 	case DM_MAPIO_REQUEUE:
 		/* The target wants to requeue the I/O */
-		dm_requeue_unmapped_request(clone);
+		dm_requeue_original_request(md, tio->orig);
 		break;
 	default:
 		if (r > 0) {
@@ -1933,7 +1926,7 @@ static void map_tio_request(struct kthread_work *work)
 	struct mapped_device *md = tio->md;
 
 	if (map_request(tio, rq, md) == DM_MAPIO_REQUEUE)
-		dm_requeue_unmapped_original_request(md, rq);
+		dm_requeue_original_request(md, rq);
 }
 
 static void dm_start_request(struct mapped_device *md, struct request *orig)