Message ID | 1334232076-19018-21-git-send-email-pbonzini@redhat.com |
---|---|
State | New |
Headers | show |
diff --git a/block/stream.c b/block/stream.c index 54f2b39..2b492d5 100644 --- a/block/stream.c +++ b/block/stream.c @@ -240,11 +240,14 @@ retry: } if (!block_job_is_cancelled(&s->common) && sector_num == end && ret == 0) { - const char *base_id = NULL; + const char *base_id = NULL, *base_fmt = NULL; if (base) { base_id = s->backing_file_id; + if (base->drv) { + base_fmt = base->drv->format_name; + } } - ret = bdrv_change_backing_file(bs, base_id, NULL); + ret = bdrv_change_backing_file(bs, base_id, base_fmt); close_unused_images(bs, base, base_id); }