/* kick off io on the underlying address space  */
static void loop_unplug(struct request_queue *q)
/* kick off io on the underlying address space  */
static void loop_unplug(struct request_queue *q)
{
	struct loop_device *lo = q->queuedata;
	queue_flag_clear_unlocked(QUEUE_FLAG_PLUGGED, q);
	blk_run_address_space(lo->lo_backing_file->f_mapping);
}