Re: [Qemu-devel] [PATCH V2 4/5] Add backing file loop check in change_backing_file()

[Fam Zheng <famz@redhat.com>]

On Mon, 07/08 03:26, Xu Wang wrote:
> Signed-off-by: Xu Wang <cngesaint@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