dlmgmt_zfop
*err = dlmgmt_zfop(filename, zoneid, dlmgmt_zopen_cb, &zfoparg);
return (dlmgmt_zfop(old, zoneid, dlmgmt_zrename_cb, &zfoparg));
return (dlmgmt_zfop(filename, zoneid, dlmgmt_zunlink_cb, NULL));