ZVIO_COMMIT
zvio->zvio_flags = ZVIO_COMMIT;
flags = (commit) ? ZVIO_COMMIT : 0;
ASSERT(flags == 0 || flags == ZVIO_COMMIT || flags == ZVIO_ABORT);
if (sync && (flags & ZVIO_COMMIT))
ASSERT(flags == 0 || flags == ZVIO_COMMIT);
if (sync && (flags & ZVIO_COMMIT))