ISUID
if (ip->mode & ISUID) {
ip->mode &= ~ISUID;
if (ip->i_e2fs_mode & ISUID) {
ip->i_e2fs_mode &= ISUID;
if (ouid != uid && (ip->i_e2fs_mode & ISUID) &&
ip->i_e2fs_mode &= ~ISUID;
if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid && ucred) {
ip->i_mode &= ~(ISUID | ISGID);
if (ip->i_mode & ISUID) {
ip->i_mode &= ~ISUID;
if (ip->i_mode & ISUID) {
ip->i_mode &= ~ISUID;