KTDF_WAIT
if (ktd->ktd_flags & KTDF_WAIT) {
ktd->ktd_flags &= ~(KTDF_WAIT | KTDF_BLOCKING);
(/* flags & KTA_LARGE */0 || ktd->ktd_flags & KTDF_WAIT ||
ktd->ktd_flags |= KTDF_WAIT;
(ktd->ktd_flags & (KTDF_WAIT | KTDF_DONE)) == KTDF_WAIT);