BLK_MQ_S_TAG_ACTIVE
if (test_bit(BLK_MQ_S_TAG_ACTIVE, &hctx->state) ||
test_and_set_bit(BLK_MQ_S_TAG_ACTIVE, &hctx->state))
if (!test_and_clear_bit(BLK_MQ_S_TAG_ACTIVE, &hctx->state))
if (!test_bit(BLK_MQ_S_TAG_ACTIVE, &hctx->state))