MASK_TC_BIT
what |= MASK_TC_BIT(opf, SYNC);
what |= MASK_TC_BIT(opf, RAHEAD);
what |= MASK_TC_BIT(opf, META);
what |= MASK_TC_BIT(opf, PREFLUSH);
what |= MASK_TC_BIT(opf, FUA);