[Qemu-devel] [PATCH 14/22] block: add bdrv_load_dirty_bitmap()

[Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>]

The funcion loads dirty bitmap from file, using underlying driver
function.

Note: the function doesn't change BdrvDirtyBitmap.file field. This field
is only used by bdrv_store_dirty_bitmap() function and is ONLY written
by bdrv_dirty_bitmap_set_file() function.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
 block/dirty-bitmap.c         | 16 ++++++++++++++++
 include/block/dirty-bitmap.h |  2 ++
 2 files changed, 18 insertions(+)

diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index c9e999f..87ee4d7 100644
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -469,3 +469,19 @@ void bdrv_finalize_persistent_dirty_bitmaps(BlockDriverState *bs)
         }
     }
 }
+
+BdrvDirtyBitmap *bdrv_load_dirty_bitmap(BlockDriverState *bs, const char *name,
+                                        Error **errp)
+{
+    BlockDriver *drv = bs->drv;
+    if (!drv) {
+        return NULL;
+    }
+    if (drv->bdrv_dirty_bitmap_load) {
+        return drv->bdrv_dirty_bitmap_load(bs, name, errp);
+    }
+    if (bs->file)  {
+        return bdrv_load_dirty_bitmap(bs, name, errp);
+    }
+    return NULL;
+}
diff --git a/include/block/dirty-bitmap.h b/include/block/dirty-bitmap.h
index 37b5f23..66ba3f8 100644
--- a/include/block/dirty-bitmap.h
+++ b/include/block/dirty-bitmap.h
@@ -59,5 +59,7 @@ void bdrv_dirty_bitmap_set_internal_persistance(BdrvDirtyBitmap *bitmap,
 void bdrv_store_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap,
                              Error **errp);
 void bdrv_finalize_persistent_dirty_bitmaps(BlockDriverState *bs);
+BdrvDirtyBitmap *bdrv_load_dirty_bitmap(BlockDriverState *bs, const char *name,
+                                        Error **errp);
 
 #endif
-- 
1.8.3.1