deextend
int deextend(struct denode *, uint32_t, struct ucred *);
return (deextend(dep, length, cred));
if ((error = deextend(dep, uio->uio_offset, cred)) != 0)
int deextend(struct denode *, u_long);
return (deextend(dep, length));
if ((error = deextend(dep, nsize)) != 0) {