Re: [Qemu-block] [PATCH v2 03/21] mirror: Error out when a BDS would get two BBs

[Alberto Garcia]

On Mon 23 Nov 2015 04:59:42 PM CET, Kevin Wolf wrote:

> @@ -370,11 +371,22 @@ static void mirror_exit(BlockJob *job, void *opaque)
>          if (s->to_replace) {
>              to_replace = s->to_replace;
>          }
> +
> +        /* This was checked in mirror_start_job(), but meanwhile one of the
> +         * nodes could have been newly attached to a BlockBackend. */
> +        if (to_replace->blk && s->target->blk) {
> +            error_report("block job: Can't create node with two 
> BlockBackends");
> +            data->ret = -EINVAL;
> +            goto out;
> +        }

Does it make sense to even allow attaching a BDS to a Block Backend
during this block job? Is there any use case for that?

Berto