On Tue, May 31, 2016 at 12:15:26PM +0300, Denis V. Lunev wrote:
> diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
> index 57df069..3d7b446 100644
> --- a/include/sysemu/block-backend.h
> +++ b/include/sysemu/block-backend.h
> @@ -205,6 +205,9 @@ int coroutine_fn blk_co_pwrite_zeroes(BlockBackend *blk, int64_t offset,
>                                        int count, BdrvRequestFlags flags);
>  int blk_pwrite_compressed(BlockBackend *blk, int64_t offset, const void *buf,
>                            int count);
> +int coroutine_fn blk_co_pwritev_compressed(BlockBackend *blk, int64_t offset,
> +                                           unsigned int bytes,
> +                                           QEMUIOVector *qiov);

Perhaps blk_co_pwritev_compressed() isn't necessary at all since
blk_co_pwritev() already exists and has the flags argument:

int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset,
                               unsigned int bytes, QEMUIOVector *qiov,
                               BdrvRequestFlags flags);