nfs4_ncookie
rc->nfs4_ncookie = 0;
uiop->uio_loffset == rp->r_direof->nfs4_ncookie) {
uiop->uio_loffset = rdc->nfs4_ncookie;
rrdc = rddir4_cache_lookup(rp, rdc->nfs4_ncookie, count);
rdc->nfs4_ncookie = last_cookie;