UID
if (oldUser->UID() != user->UID()
fUsersByID[user->UID()] = user;
fUsersByID.erase(fUsersByID.find(user->UID()));
fUsersByID.erase(fUsersByID.find(user->UID()));
inline uint32 UID() const { return fNode.uid; }
st->st_uid = node->UID();
bool isOwnerOrRoot = uid == 0 || uid == node->UID();
if ((statMask & B_STAT_UID) != 0 && st->st_uid != node->UID()) {
} else if (uid == node->UID()) {