Add sparse devices: lvcreate -s --virtualoriginsize (hidden zero origin).

Add lvs origin_size field.
Fix linux configure --enable-debug to exclude -O2.

Still a few rough edges, but hopefully usable now:
  lvcreate -s vg1 -L 100M --virtualoriginsize 1T

1 files changed, 10 insertions, 0 deletions

diff --git a/lib/metadata/snapshot_manip.c b/lib/metadata/snapshot_manip.c
index 39553820..1189dbdb 100644
--- a/lib/metadata/snapshot_manip.c
+++ b/lib/metadata/snapshot_manip.c
@@ -44,6 +44,12 @@ int lv_is_displayable(const struct logical_volume *lv)
 	return (lv->status & VISIBLE_LV) || lv_is_cow(lv) ? 1 : 0;
 }
 
+int lv_is_virtual_origin(const struct logical_volume *lv)
+{
+	return (lv->status & VIRTUAL_ORIGIN) ? 1 : 0;
+}
+
+
 /* Given a cow LV, return the snapshot lv_segment that uses it */
 struct lv_segment *find_cow(const struct logical_volume *lv)
 {
@@ -105,6 +111,10 @@ int vg_add_snapshot(const char *name, struct logical_volume *origin,
 
 	cow->status &= ~VISIBLE_LV;
 
+        /* FIXME Assumes an invisible origin belongs to a sparse device */
+        if (!lv_is_visible(origin))
+                origin->status |= VIRTUAL_ORIGIN;
+
 	dm_list_add(&origin->snapshot_segs, &seg->origin_list);
 
 	return 1;