ZPOOL_CONFIG_TOP_GUID
nvlist_find(nvlist, ZPOOL_CONFIG_TOP_GUID, DATA_TYPE_UINT64,
nvlist_lookup_uint64(config, ZPOOL_CONFIG_TOP_GUID,
fnvlist_add_uint64(config, ZPOOL_CONFIG_TOP_GUID,
if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_TOP_GUID, &top_guid)
ZPOOL_CONFIG_TOP_GUID);