V_ADP_MODECHANGE
if (!(adp->va_flags & V_ADP_MODECHANGE)) {
prologue(adp, V_ADP_MODECHANGE, ENODEV);
if (adp->va_flags & V_ADP_MODECHANGE) {
adp->va_flags |= V_ADP_MODECHANGE;
if (adp->va_flags & V_ADP_MODECHANGE) {