qcow2: store bitmaps on reopening image as read-only

Store bitmaps and mark them read-only on reopening image as read-only.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 20170628120530.31251-21-vsementsov@virtuozzo.com
Signed-off-by: Max Reitz <mreitz@redhat.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/block/qcow2-bitmap.c b/block/qcow2-bitmap.c
index 81c49aecdb..f82478c02a 100644
--- a/block/qcow2-bitmap.c
+++ b/block/qcow2-bitmap.c
@@ -1366,3 +1366,25 @@ fail:
 
     bitmap_list_free(bm_list);
 }
+
+int qcow2_reopen_bitmaps_ro(BlockDriverState *bs, Error **errp)
+{
+    BdrvDirtyBitmap *bitmap;
+    Error *local_err = NULL;
+
+    qcow2_store_persistent_dirty_bitmaps(bs, &local_err);
+    if (local_err != NULL) {
+        error_propagate(errp, local_err);
+        return -EINVAL;
+    }
+
+    for (bitmap = bdrv_dirty_bitmap_next(bs, NULL); bitmap != NULL;
+         bitmap = bdrv_dirty_bitmap_next(bs, bitmap))
+    {
+        if (bdrv_dirty_bitmap_get_persistance(bitmap)) {
+            bdrv_dirty_bitmap_set_readonly(bitmap, true);
+        }
+    }
+
+    return 0;
+}