Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
 block/dirty-bitmap.c         | 7 +++++++
 include/block/dirty-bitmap.h | 3 +++
 2 files changed, 10 insertions(+)

diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index d2f23a00d9..3b7db1d78c 100644
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -538,3 +538,10 @@ int64_t bdrv_dirty_bitmap_next_zero(BdrvDirtyBitmap *bitmap, uint64_t start)
 {
     return hbitmap_next_zero(bitmap->bitmap, start);
 }
+
+BdrvDirtyBitmap *bdrv_dirty_bitmap_next(BlockDriverState *bs,
+                                        BdrvDirtyBitmap *bitmap)
+{
+    return bitmap == NULL ? QLIST_FIRST(&bs->dirty_bitmaps) :
+                            QLIST_NEXT(bitmap, list);
+}
diff --git a/include/block/dirty-bitmap.h b/include/block/dirty-bitmap.h
index 8826b74b37..ff8163ba02 100644
--- a/include/block/dirty-bitmap.h
+++ b/include/block/dirty-bitmap.h
@@ -74,4 +74,7 @@ void bdrv_dirty_bitmap_deserialize_finish(BdrvDirtyBitmap *bitmap);
 
 int64_t bdrv_dirty_bitmap_next_zero(BdrvDirtyBitmap *bitmap, uint64_t start);
 
+BdrvDirtyBitmap *bdrv_dirty_bitmap_next(BlockDriverState *bs,
+                                        BdrvDirtyBitmap *bitmap);
+
 #endif
-- 
2.11.0