nfs_ncookie
uiop->uio_offset == rp->r_direof->nfs_ncookie) {
uiop->uio_offset = rdc->nfs_ncookie;
srdc.nfs_cookie = rdc->nfs_ncookie;
rrdc->nfs_cookie = rdc->nfs_ncookie;
rdc->nfs_ncookie = rd.rd_offset;