ncl_getcookie
cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
nfsuint64 *ncl_getcookie(struct nfsnode *, off_t, int);