[Qemu-devel] [PATCH 21/22] qcow2-dirty-bitmap: add AUTO flag

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

The bitmap should be auto-loaded if auto flag is set.
For now, actually, there are no methods to set it.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
 block/qcow2-dirty-bitmap.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/block/qcow2-dirty-bitmap.c b/block/qcow2-dirty-bitmap.c
index 70c6e36..159e935 100644
--- a/block/qcow2-dirty-bitmap.c
+++ b/block/qcow2-dirty-bitmap.c
@@ -42,8 +42,9 @@
 #define BME_MAX_NAME_SIZE 1023
 
 /* Bitmap directory entry flags */
-#define BME_RESERVED_FLAGS 0xfffffffe
+#define BME_RESERVED_FLAGS 0xfffffffc
 #define BME_FLAG_IN_USE 1
+#define BME_FLAG_AUTO   (1U << 1)
 
 /* bits [1, 8] U [56, 63] are reserved */
 #define BME_TABLE_ENTRY_RESERVED_MASK 0xff000000000001fe
@@ -52,6 +53,9 @@ typedef enum BitmapType {
     BT_DIRTY_TRACKING_BITMAP = 1
 } BitmapType;
 
+static BdrvDirtyBitmap *load_bitmap(BlockDriverState *bs, QCow2Bitmap *bm,
+                                    Error **errp);
+
 void qcow2_free_bitmaps(BlockDriverState *bs)
 {
     BDRVQcow2State *s = bs->opaque;
@@ -215,6 +219,13 @@ static int directory_read(BlockDriverState *bs, Error **errp)
         bm->offset = offset;
         bm->name = g_strndup((char *)(h + 1), h->name_size);
 
+        if (h->flags & BME_FLAG_AUTO) {
+            load_bitmap(bs, bm, errp);
+            if (*errp != NULL) {
+                goto fail;
+            }
+        }
+
         offset += dir_entry_size(h);
     }
     return 0;
-- 
1.8.3.1