DV_NEXT_ENTRY
next = DV_NEXT_ENTRY(ddv, dv);
for (dv = DV_FIRST_ENTRY(ddv); dv; dv = DV_NEXT_ENTRY(ddv, dv)) {
for (dv = DV_FIRST_ENTRY(ddv); dv; dv = DV_NEXT_ENTRY(ddv, dv)) {
dv = DV_NEXT_ENTRY(ddv, dv), diroff++) {