On Mon, 07/08 03:26, Xu Wang wrote:
> Signed-off-by: Xu Wang <cngesa...@gmail.com>
> ---
> block.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/block.c b/block.c
> index 6df25d9..379b79b 100644
> --- a/block.c
> +++ b/block.c
> @@ -1971,6 +1971,12 @@ int bdrv_change_backing_file(BlockDriverState *bs,
> return -EINVAL;
> }
>
> + /* Check if loop exists in backing files chain after changed */
> + if (bdrv_backing_file_loop_check(bs->filename, NULL, true, backing_file,
You can use bs->drv->format_name for fmt.
> + backing_fmt)) {
> + return -EIO;
> + }
> +
> if (drv->bdrv_change_backing_file != NULL) {
> ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt);
> } else {
> --
> 1.8.1.4
>
>
--
Fam
