1 files changed, 5 insertions, 2 deletions
diff --git a/block/qed.c b/block/qed.c
index 7c2a65a..d8c4e5f 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -673,8 +673,11 @@ static int coroutine_fn bdrv_qed_co_create(BlockdevCreateOptions *opts,
 
     l1_size = header.cluster_size * header.table_size;
 
-    /* File must start empty and grow, check truncate is supported */
-    ret = blk_truncate(blk, 0, false, PREALLOC_MODE_OFF, errp);
+    /*
+     * The QED format associates file length with allocation status,
+     * so a new file (which is empty) must have a length of 0.
+     */
+    ret = blk_truncate(blk, 0, true, PREALLOC_MODE_OFF, errp);
     if (ret < 0) {
         goto out;
     }