mkrid
rid = mkrid(in_rsnum, rnum);
rid = mkrid(in_rsnum, eatoi(av[1]));
dr.dr_id = mkrid(in_rsnum, 0);
dr.dr_id = mkrid(in_rsnum, rnum - 1);
dr.dr_id = mkrid(in_rsnum, 0);
dr->dr_id = mkrid(rsnum, rnum);
rsnum = rid2rsn(devfs_rid_input(mkrid(rsnum, 0), dm));
return (mkrid(dm->dm_ruleset, rid2rn(rid)));
KASSERT(devfs_rule_byid(mkrid(ds->ds_number, *rnump)) == NULL,
dk->dk_rule.dr_id = mkrid(rid2rsn(dk->dk_rule.dr_id), dkrn);