blk_empty_barrier  184 block/blk-barrier.c 	if ((q->ordered & QUEUE_ORDERED_POSTFLUSH) && !blk_empty_barrier(rq))
blk_empty_barrier 1671 block/blk-core.c 		if (blk_empty_barrier(req))
blk_empty_barrier  756 block/elevator.c 		if (blk_empty_barrier(rq)) {