Re: [Qemu-block] [RFC PATCH v2 6/7] block-backend: Add blk_co_copy_range

[Stefan Hajnoczi]

On Wed, Apr 18, 2018 at 11:04:23AM +0800, Fam Zheng wrote:
> It's a BlockBackend wrapper of the BDS interface.
> 
> Signed-off-by: Fam Zheng <address@hidden>
> ---
>  block/block-backend.c          | 9 +++++++++
>  include/sysemu/block-backend.h | 4 ++++
>  2 files changed, 13 insertions(+)
> 
> diff --git a/block/block-backend.c b/block/block-backend.c
> index 681b240b12..2a984b1864 100644
> --- a/block/block-backend.c
> +++ b/block/block-backend.c
> @@ -2217,3 +2217,12 @@ void blk_unregister_buf(BlockBackend *blk, void *host)
>  {
>      bdrv_unregister_buf(blk_bs(blk), host);
>  }
> +
> +int coroutine_fn blk_co_copy_range(BlockBackend *blk_in, int64_t off_in,
> +                                   BlockBackend *blk_out, int64_t off_out,
> +                                   int bytes, BdrvRequestFlags flags)
> +{
> +    return bdrv_co_copy_range(blk_in->root, off_in,
> +                              blk_out->root, off_out,
> +                              bytes, flags);
> +}

What happens if either ->root field is NULL?

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