To just release successor and unfreeze bitmap without any additional
work.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
 block/dirty-bitmap.c         | 10 ++++++++++
 include/block/dirty-bitmap.h |  2 ++
 2 files changed, 12 insertions(+)

diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index ab2c7f5..32aa6eb 100644
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -274,6 +274,16 @@ BdrvDirtyBitmap *bdrv_reclaim_dirty_bitmap(BlockDriverState *bs,
     return parent;
 }
 
+void bdrv_dirty_bitmap_release_successor(BlockDriverState *bs,
+                                         BdrvDirtyBitmap *parent)
+{
+    BdrvDirtyBitmap *successor = parent->successor;
+
+    if (successor) {
+        bdrv_release_dirty_bitmap(bs, successor);
+        parent->successor = NULL;
+    }
+}
 /**
  * Truncates _all_ bitmaps attached to a BDS.
  */
diff --git a/include/block/dirty-bitmap.h b/include/block/dirty-bitmap.h
index 57b476c..20b3ec7 100644
--- a/include/block/dirty-bitmap.h
+++ b/include/block/dirty-bitmap.h
@@ -20,6 +20,8 @@ BdrvDirtyBitmap *bdrv_dirty_bitmap_abdicate(BlockDriverState *bs,
 BdrvDirtyBitmap *bdrv_reclaim_dirty_bitmap(BlockDriverState *bs,
                                            BdrvDirtyBitmap *bitmap,
                                            Error **errp);
+void bdrv_dirty_bitmap_release_successor(BlockDriverState *bs,
+                                         BdrvDirtyBitmap *bitmap);
 void bdrv_dirty_bitmap_enable_successor(BdrvDirtyBitmap *bitmap);
 BdrvDirtyBitmap *bdrv_find_dirty_bitmap(BlockDriverState *bs,
                                         const char *name);
-- 
1.8.3.1