Re: [Qemu-devel] [RFC PATCH COLO v2 06/13] NBD client: implement block driver interfaces for block replication

[Paolo Bonzini <pbonzini@redhat.com>]

On 25/03/2015 10:36, Wen Congyang wrote:
> Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
> Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
> Signed-off-by: Gonglei <arei.gonglei@huawei.com>
> ---
>  block/nbd.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 49 insertions(+)
> 
> diff --git a/block/nbd.c b/block/nbd.c
> index 3faf865..753b322 100644
> --- a/block/nbd.c
> +++ b/block/nbd.c
> @@ -458,6 +458,52 @@ static void nbd_refresh_filename(BlockDriverState *bs)
>      bs->full_open_options = opts;
>  }
>  
> +static void nbd_start_replication(BlockDriverState *bs, COLOMode mode,
> +                                  Error **errp)
> +{
> +    BDRVNBDState *s = bs->opaque;
> +
> +    /*
> +     * TODO: support COLO_SECONDARY_MODE if we allow secondary
> +     * QEMU becoming primary QEMU.
> +     */
> +    if (mode != COLO_MODE_PRIMARY) {
> +        error_set(errp, QERR_INVALID_PARAMETER, "mode");
> +        return;
> +    }
> +
> +    if (s->connected) {
> +        error_setg(errp, "The connection is established");
> +        return;
> +    }
> +
> +    /* TODO: NBD client should be one child of quorum, how to verify it? */
> +    nbd_connect_server(bs, errp);
> +}
> +
> +static void nbd_do_checkpoint(BlockDriverState *bs, Error **errp)
> +{
> +    BDRVNBDState *s = bs->opaque;
> +
> +    if (!s->connected) {
> +        error_setg(errp, "The connection is not established");
> +        return;
> +    }
> +}
> +
> +static void nbd_stop_replication(BlockDriverState *bs, Error **errp)
> +{
> +    BDRVNBDState *s = bs->opaque;
> +
> +    if (!s->connected) {
> +        error_setg(errp, "The connection is not established");
> +        return;
> +    }
> +
> +    nbd_client_close(bs);
> +    s->connected = false;
> +}
> +
>  static BlockDriver bdrv_nbd = {
>      .format_name                = "nbd",
>      .protocol_name              = "nbd",
> @@ -527,6 +573,9 @@ static BlockDriver bdrv_nbd_colo = {
>      .bdrv_detach_aio_context    = nbd_detach_aio_context,
>      .bdrv_attach_aio_context    = nbd_attach_aio_context,
>      .bdrv_refresh_filename      = nbd_refresh_filename,
> +    .bdrv_start_replication     = nbd_start_replication,
> +    .bdrv_do_checkpoint         = nbd_do_checkpoint,
> +    .bdrv_stop_replication      = nbd_stop_replication,
>  
>      .has_variable_length        = true,
>  };
> 

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>