When activating a shared snapshot, activate origin first.

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

---
 tools/lvchange.c |    7 +++++++
 1 file changed, 7 insertions(+)

Index: LVM2.2.02.54/tools/lvchange.c
===================================================================
--- LVM2.2.02.54.orig/tools/lvchange.c	2009-09-29 22:22:35.000000000 +0200
+++ LVM2.2.02.54/tools/lvchange.c	2009-10-29 20:32:37.000000000 +0100
@@ -118,6 +118,13 @@ static int lvchange_availability(struct 
 		if (!deactivate_lv(cmd, lv))
 			return_0;
 	} else {
+		struct lv_segment *snap_s;
+		/* If this is shared snapshot, activate origin first */
+		if (lv_is_multisnap_cow(lv) &&
+		    (snap_s = first_seg(lv)) && snap_s->origin) {
+			if (!activate_lv_excl(cmd, snap_s->origin))
+				return_0;
+		}
 		if (lv_is_origin(lv) || (activate == CHANGE_AE)) {
 			log_verbose("Activating logical volume \"%s\" "
 				    "exclusively", lv->name);