zil_async_to_sync
extern void zil_async_to_sync(zilog_t *zilog, uint64_t foid);
zil_async_to_sync(zfsvfs->z_log, zp->z_id);
zil_async_to_sync(zilog, itx->itx_oid);
zil_async_to_sync(zilog, foid);