Re: [Qemu-devel] [PATCH v3 08/20] mirror: Switch mirror_do_zero_or_discard() to byte-based

[Jeff Cody <jcody@redhat.com>]

On Tue, Jun 27, 2017 at 02:24:46PM -0500, Eric Blake wrote:
> We are gradually converting to byte-based interfaces, as they are
> easier to reason about than sector-based.  Convert another internal
> function (no semantic change).
> 
> Signed-off-by: Eric Blake <eblake@redhat.com>
> Reviewed-by: John Snow <jsnow@redhat.com>
> 

Reviewed-by: Jeff Cody <jcody@redhat.com>

> ---
> v2: no change
> ---
>  block/mirror.c | 20 +++++++++++---------
>  1 file changed, 11 insertions(+), 9 deletions(-)
> 
> diff --git a/block/mirror.c b/block/mirror.c
> index 9e28d59..af27bcc 100644
> --- a/block/mirror.c
> +++ b/block/mirror.c
> @@ -305,8 +305,8 @@ static int mirror_do_read(MirrorBlockJob *s, int64_t sector_num,
>  }
> 
>  static void mirror_do_zero_or_discard(MirrorBlockJob *s,
> -                                      int64_t sector_num,
> -                                      int nb_sectors,
> +                                      int64_t offset,
> +                                      uint64_t bytes,
>                                        bool is_discard)
>  {
>      MirrorOp *op;
> @@ -315,16 +315,16 @@ static void mirror_do_zero_or_discard(MirrorBlockJob *s,
>       * so the freeing in mirror_iteration_done is nop. */
>      op = g_new0(MirrorOp, 1);
>      op->s = s;
> -    op->offset = sector_num * BDRV_SECTOR_SIZE;
> -    op->bytes = nb_sectors * BDRV_SECTOR_SIZE;
> +    op->offset = offset;
> +    op->bytes = bytes;
> 
>      s->in_flight++;
> -    s->bytes_in_flight += nb_sectors * BDRV_SECTOR_SIZE;
> +    s->bytes_in_flight += bytes;
>      if (is_discard) {
> -        blk_aio_pdiscard(s->target, sector_num << BDRV_SECTOR_BITS,
> +        blk_aio_pdiscard(s->target, offset,
>                           op->bytes, mirror_write_complete, op);
>      } else {
> -        blk_aio_pwrite_zeroes(s->target, sector_num * BDRV_SECTOR_SIZE,
> +        blk_aio_pwrite_zeroes(s->target, offset,
>                                op->bytes, s->unmap ? BDRV_REQ_MAY_UNMAP : 0,
>                                mirror_write_complete, op);
>      }
> @@ -453,7 +453,8 @@ static uint64_t coroutine_fn mirror_iteration(MirrorBlockJob *s)
>              break;
>          case MIRROR_METHOD_ZERO:
>          case MIRROR_METHOD_DISCARD:
> -            mirror_do_zero_or_discard(s, sector_num, io_sectors,
> +            mirror_do_zero_or_discard(s, sector_num * BDRV_SECTOR_SIZE,
> +                                      io_sectors * BDRV_SECTOR_SIZE,
>                                        mirror_method == MIRROR_METHOD_DISCARD);
>              if (write_zeroes_ok) {
>                  io_bytes_acct = 0;
> @@ -657,7 +658,8 @@ static int coroutine_fn mirror_dirty_init(MirrorBlockJob *s)
>                  continue;
>              }
> 
> -            mirror_do_zero_or_discard(s, sector_num, nb_sectors, false);
> +            mirror_do_zero_or_discard(s, sector_num * BDRV_SECTOR_SIZE,
> +                                      nb_sectors * BDRV_SECTOR_SIZE, false);
>              sector_num += nb_sectors;
>          }
> 
> -- 
> 2.9.4
>