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: LVM2.2.02.60/lib/metadata/metadata-exported.h
===================================================================
--- LVM2.2.02.60.orig/lib/metadata/metadata-exported.h	2010-02-08 20:15:25.000000000 +0100
+++ LVM2.2.02.60/lib/metadata/metadata-exported.h	2010-02-08 20:31:58.000000000 +0100
@@ -614,6 +614,7 @@ struct physical_volume *find_pv_by_name(
 
 /* 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: LVM2.2.02.60/lib/metadata/metadata.c
===================================================================
--- LVM2.2.02.60.orig/lib/metadata/metadata.c	2010-01-21 22:09:23.000000000 +0100
+++ LVM2.2.02.60/lib/metadata/metadata.c	2010-02-08 20:31:58.000000000 +0100
@@ -1746,6 +1746,16 @@ 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;
+}
+
 /* Find segment at a given physical extent in a PV */
 struct pv_segment *find_peg_by_pe(const struct physical_volume *pv, uint32_t pe)
 {