Re: [Qemu-devel] [PATCH v4 4/7] mirror: Add commit_job_type to perform commit with mirror code

[Eric Blake <eblake@redhat.com>]

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On 09/30/2013 06:02 AM, Fam Zheng wrote:
> Commit active layer will be implemented in block/mirror.c, prepare a new
> job type to let it have a right type name for the user.
> 
> Signed-off-by: Fam Zheng <famz@redhat.com>
> ---
>  block/mirror.c            | 12 +++++++++++-
>  blockdev.c                |  2 +-
>  include/block/block_int.h |  2 ++
>  3 files changed, 14 insertions(+), 2 deletions(-)
> 
> diff --git a/block/mirror.c b/block/mirror.c
> index af6851f..20dcfb6 100644
> --- a/block/mirror.c
> +++ b/block/mirror.c
> @@ -532,10 +532,19 @@ static const BlockJobType mirror_job_type = {
>      .complete      = mirror_complete,
>  };
>  
> +static const BlockJobType commit_job_type = {
> +    .instance_size = sizeof(MirrorBlockJob),
> +    .job_type      = "commit",

I still wonder if we should complete the conversion over to a QAPI enum
type for all valid job types prior to hard-coding open strings through
yet more of the code base.  As long as we don't have introspection done
yet, we can still make the switch, and in the long run, having an enum
of valid job types seems like it will be better for maintenance, all
with no change to what is sent over the wire in QMP.

> @@ -390,6 +391,7 @@ void mirror_start(BlockDriverState *bs, BlockDriverState *target,
>                    int64_t speed, int64_t granularity, int64_t buf_size,
>                    MirrorSyncMode mode, BlockdevOnError on_source_error,
>                    BlockdevOnError on_target_error,
> +                  bool commit_job,

If we DO create a QAPI enum for job type, then this parameter would be
the enum type, rather than a bool.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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