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-rw-r--r--block/cow.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/block/cow.c b/block/cow.c
index dc15e46b6c..7fc0b12163 100644
--- a/block/cow.c
+++ b/block/cow.c
@@ -351,7 +351,8 @@ static int cow_create(const char *filename, QEMUOptionParameter *options,
         return ret;
     }
 
-    ret = bdrv_file_open(&cow_bs, filename, NULL, BDRV_O_RDWR, &local_err);
+    ret = bdrv_file_open(&cow_bs, filename, NULL, NULL, BDRV_O_RDWR,
+                         &local_err);
     if (ret < 0) {
         qerror_report_err(local_err);
         error_free(local_err);