Implement a function to return the last segment in a LV.

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

---
 lib/metadata/metadata-exported.h |    1 +
 lib/metadata/metadata.c          |   10 ++++++++++
 2 files changed, 11 insertions(+)

Index: LVM2.2.02.85/lib/metadata/metadata-exported.h
===================================================================
--- LVM2.2.02.85.orig/lib/metadata/metadata-exported.h	2011-05-23 15:59:36.000000000 +0200
+++ LVM2.2.02.85/lib/metadata/metadata-exported.h	2011-05-23 16:00:19.000000000 +0200
@@ -613,6 +613,7 @@ const char *find_vgname_from_pvid(struct
 				  const char *pvid);
 /* Find LV segment containing given LE */
 struct lv_segment *first_seg(const struct logical_volume *lv);
+struct lv_segment *last_seg(const struct logical_volume *lv);
 
 
 /*
Index: LVM2.2.02.85/lib/metadata/metadata.c
===================================================================
--- LVM2.2.02.85.orig/lib/metadata/metadata.c	2011-05-20 14:57:19.000000000 +0200
+++ LVM2.2.02.85/lib/metadata/metadata.c	2011-05-23 16:00:19.000000000 +0200
@@ -1865,6 +1865,16 @@ struct lv_segment *first_seg(const struc
 	return NULL;
 }
 
+struct lv_segment *last_seg(const struct logical_volume *lv)
+{
+	struct lv_segment *seg;
+
+	dm_list_iterate_back_items(seg, &lv->segments)
+		return seg;
+
+	return NULL;
+}
+
 int vg_remove_mdas(struct volume_group *vg)
 {
 	struct metadata_area *mda;