delay_class_ctr
ret = delay_class_ctr(ti, &dc->read, argv);
ret = delay_class_ctr(ti, &dc->write, argv);
ret = delay_class_ctr(ti, &dc->flush, argv);
ret = delay_class_ctr(ti, &dc->write, argv + 3);
ret = delay_class_ctr(ti, &dc->flush, argv + 3);
ret = delay_class_ctr(ti, &dc->flush, argv + 6);