DMU_POOL_VDEV_ZAP_MAP
error = spa_dir_prop(spa, DMU_POOL_VDEV_ZAP_MAP,
DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_VDEV_ZAP_MAP,
DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_VDEV_ZAP_MAP, tx));
DMU_POOL_VDEV_ZAP_MAP, tx);