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-rw-r--r--block/mirror.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/block/mirror.c b/block/mirror.c
index 36f4f8e8bd..95366adb3a 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -329,7 +329,7 @@ static void coroutine_fn mirror_run(void *opaque)
return;
}
- length = (bdrv_getlength(bs) + s->granularity - 1) / s->granularity;
+ length = DIV_ROUND_UP(s->common.len, s->granularity);
s->in_flight_bitmap = bitmap_new(length);
/* If we have no backing file yet in the destination, we cannot let