map_id_up
uid = map_id_up(&idmap->uid_map, __vfsuid_val(vfsuid));
gid = map_id_up(&idmap->gid_map, __vfsgid_val(vfsgid));
u32 map_id_up(struct uid_gid_map *map, u32 id);
return map_id_up(&targ->uid_map, __kuid_val(kuid));
return map_id_up(&targ->gid_map, __kgid_val(kgid));
return map_id_up(&targ->projid_map, __kprojid_val(kprojid));