From 28658541daef567f0f767190c244a100ea45476f Mon Sep 17 00:00:00 2001
From: "Bryn M. Reeves" <bmr@redhat.com>
Date: Wed, 6 Jul 2016 11:10:23 +0100
Subject: [PATCH] libdm: do not permit grouping regions with histograms

Although not harmful do not allow a group containing regions with
histograms since it is not currently possible to present histogram
data aggregated for the group.
---
 libdm/libdm-stats.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/libdm/libdm-stats.c b/libdm/libdm-stats.c
index c669b5111..06aa64566 100644
--- a/libdm/libdm-stats.c
+++ b/libdm/libdm-stats.c
@@ -3767,7 +3767,11 @@ int dm_stats_create_group(struct dm_stats *dms, const char *members,
 				  FMTu64, i, dms->regions[i].group_id);
 			goto bad;
 		}
-
+		if (dms->regions[i].bounds) {
+			log_error("Region ID %d: grouping regions with "
+				  "histograms is not yet supported", i);
+			goto bad;
+		}
 		if (dms->regions[i].timescale == 1)
 			precise++;