dprintf_ds
dprintf_ds(os->os_dsl_dataset, "txg=%llu\n", tx->tx_txg);
dprintf_ds(os->os_dsl_dataset, "obj=%llu txg=%llu\n",
dprintf_ds(ds, "finished scan%s", "");
dprintf_ds((dbuf)->db_objset->os_dsl_dataset, \
dprintf_ds((dn)->dn_objset->os_dsl_dataset, "obj=%s " fmt, \