Re: [PATCH for-5.1 1/2] block: Fix bdrv_aligned_p*v() for qiov_offset != 0

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 7/28/20 2:08 PM, Max Reitz wrote:
> Since these functions take a @qiov_offset, they must always take it into
> account when working with @qiov.  There are a couple of places where
> they do not, but they should.
> 
> Fixes: 65cd4424b9df03bb5195351c33e04cbbecc0705c
> Fixes: 28c4da28695bdbe04b336b2c9c463876cc3aaa6d

Maybe:
Fixes: 65cd4424b9 ("bdrv_aligned_preadv: use and support qiov_offset")
Fixes: 28c4da2869 ("bdrv_aligned_pwritev: use and support qiov_offset")

> Reported-by: Claudio Fontana <cfontana@suse.de>
> Reported-by: Bruce Rogers <brogers@suse.com>
> Cc: qemu-stable@nongnu.org
> Signed-off-by: Max Reitz <mreitz@redhat.com>
> ---
>  block/io.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/block/io.c b/block/io.c
> index b6564e34c5..ad3a51ed53 100644
> --- a/block/io.c
> +++ b/block/io.c
> @@ -1524,12 +1524,13 @@ static int coroutine_fn bdrv_aligned_preadv(BdrvChild *child,
>              assert(num);
>  
>              ret = bdrv_driver_preadv(bs, offset + bytes - bytes_remaining,
> -                                     num, qiov, bytes - bytes_remaining, 0);
> +                                     num, qiov,
> +                                     qiov_offset + bytes - bytes_remaining, 0);
>              max_bytes -= num;
>          } else {
>              num = bytes_remaining;
> -            ret = qemu_iovec_memset(qiov, bytes - bytes_remaining, 0,
> -                                    bytes_remaining);
> +            ret = qemu_iovec_memset(qiov, qiov_offset + bytes - bytes_remaining,
> +                                    0, bytes_remaining);
>          }
>          if (ret < 0) {
>              goto out;
> @@ -2032,7 +2033,8 @@ static int coroutine_fn bdrv_aligned_pwritev(BdrvChild *child,
>              }
>  
>              ret = bdrv_driver_pwritev(bs, offset + bytes - bytes_remaining,
> -                                      num, qiov, bytes - bytes_remaining,
> +                                      num, qiov,
> +                                      qiov_offset + bytes - bytes_remaining,
>                                        local_flags);
>              if (ret < 0) {
>                  break;
>