block: Change bitmap truncate conditional to assertion

This is an artifact of an older version that had both all-bitmap and
single-bitmap truncate functions, and some info got lost in the shuffle.

Bitmaps can only be frozen during a backup operation, and a backup
operation should prevent a resize operation, so just assert that this
cannot happen.

Suggested-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 1 insertions, 3 deletions

diff --git a/block.c b/block.c
index 2786e47d1e..4ea2c4f5c8 100644
--- a/block.c
+++ b/block.c
@@ -3220,9 +3220,7 @@ static void bdrv_dirty_bitmap_truncate(BlockDriverState *bs)
     uint64_t size = bdrv_nb_sectors(bs);
 
     QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) {
-        if (bdrv_dirty_bitmap_frozen(bitmap)) {
-            continue;
-        }
+        assert(!bdrv_dirty_bitmap_frozen(bitmap));
         hbitmap_truncate(bitmap->bitmap, size);
         bitmap->size = size;
     }