XBDF_FLUSH
if ((sc->xbd_flags & (XBDF_FLUSH|XBDF_BARRIER)) != 0) {
sc->xbd_flags |= XBDF_FLUSH;
if ((sc->xbd_flags & XBDF_FLUSH) != 0)
if ((sc->xbd_flags & XBDF_FLUSH) != 0) {