Re: [Qemu-devel] [PATCH 5/7] blockdev: refactor block-dirty-bitmap-clear transaction

[Paolo Bonzini <pbonzini@redhat.com>]

On 26/03/2018 13:20, Vladimir Sementsov-Ogievskiy wrote:
> bdrv_clear_dirty_bitmap do not fail, so we can call it in transaction
> commit, avoiding any rollback.
> 
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
> ---
>  blockdev.c | 16 +---------------
>  1 file changed, 1 insertion(+), 15 deletions(-)
> 
> diff --git a/blockdev.c b/blockdev.c
> index c31bf3d98d..88eae60c1c 100644
> --- a/blockdev.c
> +++ b/blockdev.c
> @@ -2050,7 +2050,6 @@ typedef struct BlockDirtyBitmapState {
>      BlkActionState common;
>      BdrvDirtyBitmap *bitmap;
>      BlockDriverState *bs;
> -    HBitmap *backup;
>      bool prepared;
>  } BlockDirtyBitmapState;
>  
> @@ -2129,18 +2128,6 @@ static void block_dirty_bitmap_clear_prepare(BlkActionState *common,
>          error_setg(errp, "Cannot clear a readonly bitmap");
>          return;
>      }
> -
> -    bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
> -}
> -
> -static void block_dirty_bitmap_clear_abort(BlkActionState *common)
> -{
> -    BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
> -                                             common, common);
> -
> -    if (state->backup) {
> -        bdrv_undo_clear_dirty_bitmap(state->bitmap, state->backup);
> -    }

Isn't bdrv_undo_clear_dirty_bitmap new unused?

Thanks,

Paolo

>  }
>  
>  static void block_dirty_bitmap_clear_commit(BlkActionState *common)
> @@ -2148,7 +2135,7 @@ static void block_dirty_bitmap_clear_commit(BlkActionState *common)
>      BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
>                                               common, common);
>  
> -    hbitmap_free(state->backup);
> +    bdrv_clear_dirty_bitmap(state->bitmap, NULL);
>  }
>  
>  static void abort_prepare(BlkActionState *common, Error **errp)
> @@ -2210,7 +2197,6 @@ static const BlkActionOps actions[] = {
>          .instance_size = sizeof(BlockDirtyBitmapState),
>          .prepare = block_dirty_bitmap_clear_prepare,
>          .commit = block_dirty_bitmap_clear_commit,
> -        .abort = block_dirty_bitmap_clear_abort,
>      }
>  };
>  
>