rq_qos_merge      608 block/blk-core.c 	rq_qos_merge(req->q, req, bio);
rq_qos_merge      630 block/blk-core.c 	rq_qos_merge(req->q, req, bio);
rq_qos_merge      656 block/blk-core.c 	rq_qos_merge(q, req, bio);