[Qemu-block] [PATCH v20 15/30] block/dirty-bitmap: add autoload field to BdrvDirtyBitmap

[Vladimir Sementsov-Ogievskiy]

Mirror AUTO flag from Qcow2 bitmap in BdrvDirtyBitmap. This will be
needed in future, to save this flag back to Qcow2 for persistent
bitmaps.

Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>
Reviewed-by: Max Reitz <address@hidden>
Reviewed-by: John Snow <address@hidden>
---
 block/dirty-bitmap.c         | 15 +++++++++++++++
 block/qcow2-bitmap.c         |  2 ++
 include/block/dirty-bitmap.h |  3 +++
 3 files changed, 20 insertions(+)

diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index 1c9ffb292a..8a380308c3 100644
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -51,6 +51,8 @@ struct BdrvDirtyBitmap {
                                    (writes and discards), if bitmap is readonly
                                    such operations must fail and not change
                                    image or this bitmap */
+    bool autoload;              /* For persistent bitmaps: bitmap must be
+                                   autoloaded on image opening */
     QLIST_ENTRY(BdrvDirtyBitmap) list;
 };
 
@@ -77,6 +79,7 @@ void bdrv_dirty_bitmap_make_anon(BdrvDirtyBitmap *bitmap)
     assert(!bdrv_dirty_bitmap_frozen(bitmap));
     g_free(bitmap->name);
     bitmap->name = NULL;
+    bitmap->autoload = false;
 }
 
 BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs,
@@ -245,6 +248,8 @@ BdrvDirtyBitmap 
*bdrv_dirty_bitmap_abdicate(BlockDriverState *bs,
     bitmap->name = NULL;
     successor->name = name;
     bitmap->successor = NULL;
+    successor->autoload = bitmap->autoload;
+    bitmap->autoload = false;
     bdrv_release_dirty_bitmap(bs, bitmap);
 
     return successor;
@@ -573,3 +578,13 @@ bool bdrv_has_readonly_bitmaps(BlockDriverState *bs)
 
     return false;
 }
+
+void bdrv_dirty_bitmap_set_autoload(BdrvDirtyBitmap *bitmap, bool autoload)
+{
+    bitmap->autoload = autoload;
+}
+
+bool bdrv_dirty_bitmap_get_autoload(const BdrvDirtyBitmap *bitmap)
+{
+    return bitmap->autoload;
+}
diff --git a/block/qcow2-bitmap.c b/block/qcow2-bitmap.c
index a21fab8ce8..ee6d8f75a9 100644
--- a/block/qcow2-bitmap.c
+++ b/block/qcow2-bitmap.c
@@ -793,6 +793,8 @@ bool qcow2_load_autoloading_dirty_bitmaps(BlockDriverState 
*bs, Error **errp)
             if (bitmap == NULL) {
                 goto fail;
             }
+
+            bdrv_dirty_bitmap_set_autoload(bitmap, true);
             bm->flags |= BME_FLAG_IN_USE;
             created_dirty_bitmaps =
                     g_slist_append(created_dirty_bitmaps, bitmap);
diff --git a/include/block/dirty-bitmap.h b/include/block/dirty-bitmap.h
index aa6d47ee00..9416f9233f 100644
--- a/include/block/dirty-bitmap.h
+++ b/include/block/dirty-bitmap.h
@@ -79,4 +79,7 @@ bool bdrv_dirty_bitmap_readonly(const BdrvDirtyBitmap 
*bitmap);
 void bdrv_dirty_bitmap_set_readonly(BdrvDirtyBitmap *bitmap, bool value);
 bool bdrv_has_readonly_bitmaps(BlockDriverState *bs);
 
+void bdrv_dirty_bitmap_set_autoload(BdrvDirtyBitmap *bitmap, bool autoload);
+bool bdrv_dirty_bitmap_get_autoload(const BdrvDirtyBitmap *bitmap);
+
 #endif
-- 
2.11.1