TMPFS_DIRCOOKIE_DOTDOT
dent.d_off = TMPFS_DIRCOOKIE_DOTDOT;
MPASS(uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT);
uio->uio_offset = off = TMPFS_DIRCOOKIE_DOTDOT;
case TMPFS_DIRCOOKIE_DOTDOT: