Lookup snapshot usage percent of origin volume when a snapshot is merging.
---
 WHATS_NEW                  |    1 +
 lib/activate/dev_manager.c |   11 +++++++++--
 2 files changed, 10 insertions(+), 2 deletions(-)

Index: lvm2/lib/activate/dev_manager.c
===================================================================
--- lvm2.orig/lib/activate/dev_manager.c
+++ lvm2/lib/activate/dev_manager.c
@@ -742,6 +742,7 @@ int dev_manager_snapshot_percent(struct 
 				 const struct logical_volume *lv,
 				 percent_t *percent)
 {
+	const struct logical_volume *snap_lv;
 	char *name;
 	const char *dlid;
 	int fail_if_percent_unsupported = 0;
@@ -761,13 +762,19 @@ int dev_manager_snapshot_percent(struct 
 		fail_if_percent_unsupported = 1;
 	}
 
+	if (lv_is_merging_cow(lv)) {
+		/* must check percent of origin for a merging snapshot */
+		snap_lv = origin_from_cow(lv);
+	} else
+		snap_lv = lv;
+
 	/*
 	 * Build a name for the top layer.
 	 */
-	if (!(name = dm_build_dm_name(dm->mem, lv->vg->name, lv->name, NULL)))
+	if (!(name = dm_build_dm_name(dm->mem, snap_lv->vg->name, snap_lv->name, NULL)))
 		return_0;
 
-	if (!(dlid = build_dm_uuid(dm->mem, lv->lvid.s, NULL)))
+	if (!(dlid = build_dm_uuid(dm->mem, snap_lv->lvid.s, NULL)))
 		return_0;
 
 	/*
Index: lvm2/WHATS_NEW
===================================================================
--- lvm2.orig/WHATS_NEW
+++ lvm2/WHATS_NEW
@@ -1,5 +1,6 @@
 Version 2.02.89 - 
 ==================================
+  Lookup snapshot usage percent of origin volume when a snapshot is merging.
   Update lvdisplay with backward compat. config opt. lvm1_compatible_display.
   Do not report linear segtype for non-striped targets.
   Keep info about creation host and time for each logical volume.