BLK_MQ_UNIQUE_TAG_BITS
return (rq->mq_hctx->queue_num << BLK_MQ_UNIQUE_TAG_BITS) |
BUILD_BUG_ON(BLK_MQ_MAX_DEPTH > 1 << BLK_MQ_UNIQUE_TAG_BITS);
unique_tag |= (qidx << BLK_MQ_UNIQUE_TAG_BITS);
ioc->io_queue_num[tag] << BLK_MQ_UNIQUE_TAG_BITS | tag;
BLK_MQ_UNIQUE_TAG_MASK = (1 << BLK_MQ_UNIQUE_TAG_BITS) - 1,
return unique_tag >> BLK_MQ_UNIQUE_TAG_BITS;