BLK_MQ_INSERT_AT_HEAD
if (flags & BLK_MQ_INSERT_AT_HEAD) {
blk_mq_insert_request(rq, at_head ? BLK_MQ_INSERT_AT_HEAD : 0);
blk_mq_insert_request(rq, at_head ? BLK_MQ_INSERT_AT_HEAD : 0);
blk_mq_insert_request(rq, BLK_MQ_INSERT_AT_HEAD);
if (flags & BLK_MQ_INSERT_AT_HEAD)
blk_mq_request_bypass_insert(rq, BLK_MQ_INSERT_AT_HEAD);
if (flags & BLK_MQ_INSERT_AT_HEAD)
if (flags & BLK_MQ_INSERT_AT_HEAD)
if (flags & BLK_MQ_INSERT_AT_HEAD) {