Re: [Qemu-devel] [RFC PATCH COLO v2 12/13] skip nbd_target when starting block replication

[Fam Zheng <famz@redhat.com>]

On Wed, 03/25 17:36, 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.c | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/block.c b/block.c
> index bd7fa9c..3af5ad4 100644
> --- a/block.c
> +++ b/block.c
> @@ -6368,6 +6368,12 @@ BlockAcctStats *bdrv_get_stats(BlockDriverState *bs)
>  void bdrv_start_replication(BlockDriverState *bs, COLOMode mode, Error **errp)
>  {
>      BlockDriver *drv = bs->drv;
> +    Error *local_err = NULL;
> +
> +    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKING_REFERENCE, &local_err)) {
> +        error_free(local_err);

local_err is set but not used, just pass NULL. Same below.

> +        return;
> +    }
>  
>      if (drv && drv->bdrv_start_replication) {
>          drv->bdrv_start_replication(bs, mode, errp);
> @@ -6381,6 +6387,12 @@ void bdrv_start_replication(BlockDriverState *bs, COLOMode mode, Error **errp)
>  void bdrv_do_checkpoint(BlockDriverState *bs, Error **errp)
>  {
>      BlockDriver *drv = bs->drv;
> +    Error *local_err = NULL;
> +
> +    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKING_REFERENCE, &local_err)) {
> +        error_free(local_err);
> +        return;
> +    }
>  
>      if (drv && drv->bdrv_do_checkpoint) {
>          drv->bdrv_do_checkpoint(bs, errp);
> @@ -6394,6 +6406,12 @@ void bdrv_do_checkpoint(BlockDriverState *bs, Error **errp)
>  void bdrv_stop_replication(BlockDriverState *bs, Error **errp)
>  {
>      BlockDriver *drv = bs->drv;
> +    Error *local_err = NULL;
> +
> +    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKING_REFERENCE, &local_err)) {
> +        error_free(local_err);
> +        return;
> +    }
>  
>      if (drv && drv->bdrv_stop_replication) {
>          drv->bdrv_stop_replication(bs, errp);
> -- 
> 2.1.0
>