Re: [Qemu-devel] [PATCH v3 01/16] block: Introduce BDS.file_child

[Jeff Cody <jcody@redhat.com>]

On Fri, Oct 09, 2015 at 02:15:26PM +0200, Kevin Wolf wrote:
> Store the BdrvChild for bs->file. At this point, bs->file_child->bs just
> duplicates the bs->file pointer. Later, it will completely replace it.
> 
> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
> Reviewed-by: Max Reitz <mreitz@redhat.com>
> Reviewed-by: Alberto Garcia <berto@igalia.com>
> Reviewed-by: Fam Zheng <famz@redhat.com>
> ---
>  block.c                   | 12 +++++++++---
>  include/block/block_int.h |  1 +
>  2 files changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/block.c b/block.c
> index 1f90b47..75afed1 100644
> --- a/block.c
> +++ b/block.c
> @@ -1487,11 +1487,17 @@ static int bdrv_open_inherit(BlockDriverState **pbs, const char *filename,
>  
>          assert(file == NULL);
>          bs->open_flags = flags;
> -        ret = bdrv_open_image(&file, filename, options, "file",
> -                              bs, &child_file, true, &local_err);
> -        if (ret < 0) {
> +
> +        bs->file_child = bdrv_open_child(filename, options, "file", bs,
> +                                         &child_file, true, &local_err);
> +        if (local_err) {
> +            ret = -EINVAL;
>              goto fail;
>          }
> +
> +        if (bs->file_child) {
> +            file = bs->file_child->bs;
> +        }
>      }
>  
>      /* Image format probing */
> diff --git a/include/block/block_int.h b/include/block/block_int.h
> index 14ad4c3..d0dd93e 100644
> --- a/include/block/block_int.h
> +++ b/include/block/block_int.h
> @@ -381,6 +381,7 @@ struct BlockDriverState {
>      BlockDriverState *backing_hd;
>      BdrvChild *backing_child;
>      BlockDriverState *file;
> +    BdrvChild *file_child;
>  
>      NotifierList close_notifiers;
>  
> -- 
> 1.8.3.1
> 

Reviewed-by: Jeff Cody <jcody@redhat.com>