Re: [Qemu-block] [PATCH] vmdk: Set vmdk parent backing_format to vmdk

[Fam Zheng]

On Tue, 03/26 21:58, Sam Eiderman wrote:
> Commit fb2105b ("vmdk: Support version=3 in VMDK descriptor files") fixed
> the probe function to correctly guess vmdk descriptors with version=3.
> 
> This solves the issue where vmdk snapshot with parent vmdk descriptor
> containing "version=3" would be treated as raw instead vmdk.
> 
> In the future case where a new vmdk version is introduced, we will again
> experience this issue, even if the user will provide "-f vmdk" it will
> only apply to the tip image and not to the underlying "misprobed" parent
> image.
> 
> The code in vmdk.c already assumes that the backing file of vmdk must be
> vmdk (see vmdk_is_cid_valid which returns 0 if backing file is not
> vmdk).
> 
> So let's make it official by supplying the backing_format as vmdk.
> 
> Reviewed-by: Mark Kanda <address@hidden>
> Reviewed-By: Liran Alon <address@hidden>
> Reviewed-by: Arbel Moshe <address@hidden>
> Signed-off-by: Shmuel Eiderman <address@hidden>
> ---
>  block/vmdk.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/block/vmdk.c b/block/vmdk.c
> index 8dec6ef767..de8cb859f8 100644
> --- a/block/vmdk.c
> +++ b/block/vmdk.c
> @@ -397,6 +397,8 @@ static int vmdk_parent_open(BlockDriverState *bs)
>          pstrcpy(bs->auto_backing_file, end_name - p_name + 1, p_name);
>          pstrcpy(bs->backing_file, sizeof(bs->backing_file),
>                  bs->auto_backing_file);
> +        pstrcpy(bs->backing_format, sizeof(bs->backing_format),
> +                "vmdk");
>      }
>  
>  out:
> -- 
> 2.13.3
> 

Reviewed-by: Fam Zheng <address@hidden>