BLK_MQ_TAG_FAIL   122 block/blk-mq-tag.c 			return BLK_MQ_TAG_FAIL;
BLK_MQ_TAG_FAIL   136 block/blk-mq-tag.c 		return BLK_MQ_TAG_FAIL;
BLK_MQ_TAG_FAIL    50 block/blk-mq-tag.h 	BLK_MQ_TAG_MAX		= BLK_MQ_TAG_FAIL - 1,
BLK_MQ_TAG_FAIL   400 block/blk-mq.c 	if (tag == BLK_MQ_TAG_FAIL) {