Do not allow merging over mounted logical volumes.
When preserving origin, check that the snapshot is not mounted.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

---
 tools/lvconvert.c |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

Index: LVM2.2.02.39/tools/lvconvert.c
===================================================================
--- LVM2.2.02.39.orig/tools/lvconvert.c	2008-08-04 20:42:32.000000000 +0200
+++ LVM2.2.02.39/tools/lvconvert.c	2008-08-04 20:42:35.000000000 +0200
@@ -806,6 +806,7 @@ static int lvconvert_merge(struct cmd_co
 {
 	struct logical_volume *origin = origin_from_cow(lv);
 	struct lv_segment *cow_seg = find_cow(lv);
+	struct lvinfo info;
 
 	if (cow_seg->status & SNAPSHOT_MERGE) {
 		log_error("Snapshot %s is already merging", lv->name);
@@ -816,6 +817,19 @@ static int lvconvert_merge(struct cmd_co
 		return 0;
 	}
 
+	if (lv_info(cmd, origin, &info, 1, 0)) {
+		if (info.open_count) {
+			log_error("Can't merge over open origin volume");
+			return 0;
+		}
+	}
+	if (lv_info(cmd, lv, &info, 1, 0)) {
+		if (info.open_count && lp->merge != MERGE_AS_SNAPSHOT) {
+			log_error("Can't merge when snapshot is open");
+			return 0;
+		}
+	}
+
 	cow_seg->status |= SNAPSHOT_MERGE;
 	origin->merging_snapshot = cow_seg;