DM_SLICE_STAT_USE
if (stat_type == DM_SLICE_STAT_USE) {
*dev_stats = dm_get_stats(devp, DM_SLICE_STAT_USE, errp);
if (stat_type != DM_SLICE_STAT_USE) {
nvlist_t *stats = dm_get_stats(slice, DM_SLICE_STAT_USE, error);