Re: [PATCH v2 3/7] qapi: block-job-change: make copy-mode parameter optional

[Markus Armbruster <armbru@redhat.com>]

Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru> writes:

> We are going to add more parameters to change. We want to make possible
> to change only one or any subset of available options. So all the
> options should be optional.
>
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
> ---
>  block/mirror.c       | 4 ++++
>  qapi/block-core.json | 3 ++-
>  2 files changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/block/mirror.c b/block/mirror.c
> index 2816bb1042..60e8d83e4f 100644
> --- a/block/mirror.c
> +++ b/block/mirror.c
> @@ -1272,6 +1272,10 @@ static void mirror_change(BlockJob *job, JobChangeOptions *opts,
>  
>      GLOBAL_STATE_CODE();
>  
> +    if (!change_opts->has_copy_mode) {
> +        return;
> +    }
> +
>      if (qatomic_read(&s->copy_mode) == change_opts->copy_mode) {
>          return;
>      }
> diff --git a/qapi/block-core.json b/qapi/block-core.json
> index 4ec5632596..660c7f4a48 100644
> --- a/qapi/block-core.json
> +++ b/qapi/block-core.json
> @@ -3071,11 +3071,12 @@
>  #
>  # @copy-mode: Switch to this copy mode.  Currently, only the switch
>  #     from 'background' to 'write-blocking' is implemented.
> +#     If absent, copy mode remains the same.  (optional since 9.1)
>  #
>  # Since: 8.2
>  ##
>  { 'struct': 'JobChangeOptionsMirror',
> -  'data': { 'copy-mode' : 'MirrorCopyMode' } }
> +  'data': { '*copy-mode' : 'MirrorCopyMode' } }
>  
>  ##
>  # @JobChangeOptions:

Acked-by: Markus Armbruster <armbru@redhat.com>