Re: [Qemu-devel] [PATCH v2 06/12] block/json: Add functions for writing zeroes etc.

["Benoît Canet" <benoit.canet@irqsave.net>]

The Friday 07 Mar 2014 à 23:55:50 (+0100), Max Reitz wrote :
> Add passthrough functions for bdrv_aio_discard(),
> bdrv_co_write_zeroes(), bdrv_truncate() and bdrv_has_zero_init().
> 
> Signed-off-by: Max Reitz <mreitz@redhat.com>
> ---
>  block/json.c | 30 ++++++++++++++++++++++++++++++
>  1 file changed, 30 insertions(+)
> 
> diff --git a/block/json.c b/block/json.c
> index f40343e..e4cdb68 100644
> --- a/block/json.c
> +++ b/block/json.c
> @@ -95,6 +95,21 @@ static BlockDriverAIOCB *json_aio_flush(BlockDriverState *bs,
>      return bdrv_aio_flush(bs->file, cb, opaque);
>  }
>  
> +static BlockDriverAIOCB *json_aio_discard(BlockDriverState *bs,
> +                                          int64_t sector_num, int nb_sectors,
> +                                          BlockDriverCompletionFunc *cb,
> +                                          void *opaque)
> +{
> +    return bdrv_aio_discard(bs->file, sector_num, nb_sectors, cb, opaque);
> +}
> +
> +static coroutine_fn int json_co_write_zeroes(BlockDriverState *bs,
> +                                             int64_t sector_num, int nb_sectors,
> +                                             BdrvRequestFlags flags)
> +{
> +    return bdrv_co_write_zeroes(bs->file, sector_num, nb_sectors, flags);
> +}
> +
>  static void json_invalidate_cache(BlockDriverState *bs)
>  {
>      return bdrv_invalidate_cache(bs->file);
> @@ -105,6 +120,16 @@ static int64_t json_getlength(BlockDriverState *bs)
>      return bdrv_getlength(bs->file);
>  }
>  
> +static int json_truncate(BlockDriverState *bs, int64_t offset)
> +{
> +    return bdrv_truncate(bs->file, offset);
> +}
> +
> +static int json_has_zero_init(BlockDriverState *bs)
> +{
> +    return bdrv_has_zero_init(bs->file);
> +}
> +
>  static int json_refresh_limits(BlockDriverState *bs)
>  {
>      bs->bl = bs->file->bl;
> @@ -128,12 +153,17 @@ static BlockDriver bdrv_json = {
>      .bdrv_aio_readv             = json_aio_readv,
>      .bdrv_aio_writev            = json_aio_writev,
>      .bdrv_aio_flush             = json_aio_flush,
> +    .bdrv_aio_discard           = json_aio_discard,
> +
> +    .bdrv_co_write_zeroes       = json_co_write_zeroes,
>  
>      .bdrv_invalidate_cache      = json_invalidate_cache,
>  
>      .has_variable_length        = true,
>      .bdrv_getlength             = json_getlength,
> +    .bdrv_truncate              = json_truncate,
>  
> +    .bdrv_has_zero_init         = json_has_zero_init,
>      .bdrv_refresh_limits        = json_refresh_limits,
>      .bdrv_get_info              = json_get_info,
>  
> -- 
> 1.9.0
> 
Reviewed-by: Benoit Canet <benoit@irqsave.net>