nfsvno_advlock
int nfsvno_advlock(vnode_t, int, u_int64_t, u_int64_t, NFSPROC_T *);
error = nfsvno_advlock(vp, ltype, first, end, p);
(void) nfsvno_advlock(vp, rlp->rlck_type, rlp->rlck_first,