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-rw-r--r--block/commit.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/block/commit.c b/block/commit.c
index 38571510cb..0029b31944 100644
--- a/block/commit.c
+++ b/block/commit.c
@@ -135,7 +135,7 @@ static int coroutine_fn commit_run(Job *job, Error **errp)
     }
 
     if (base_len < len) {
-        ret = blk_truncate(s->base, len, false, PREALLOC_MODE_OFF, 0, NULL);
+        ret = blk_co_truncate(s->base, len, false, PREALLOC_MODE_OFF, 0, NULL);
         if (ret) {
             return ret;
         }
@@ -238,6 +238,7 @@ static BlockDriver bdrv_commit_top = {
     .bdrv_child_perm            = bdrv_commit_top_child_perm,
 
     .is_filter                  = true,
+    .filtered_child_is_backing  = true,
 };
 
 void commit_start(const char *job_id, BlockDriverState *bs,