DE_COVERED
de->de_flags |= DE_COVERED;
de_flags |= DE_COVERED;
if (dd->de_flags & (DE_COVERED | DE_WHITEOUT))
de_covered->de_flags &= ~DE_COVERED;
KASSERT((de_covered->de_flags & DE_COVERED) == 0,
de_covered->de_flags |= DE_COVERED;