dsl_dsobj_to_dsname
if (dsl_dsobj_to_dsname(spa_name(spa),
int dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf);
return (dsl_dsobj_to_dsname(zc->zc_name, zc->zc_obj, zc->zc_value));
error = dsl_dsobj_to_dsname(bpath, objnum, outpath);