Re: [Qemu-devel] [PATCH 3/3] block: process before_write_notifiers in bdrv_co_discard

[Fam Zheng <famz@redhat.com>]

On Thu, 06/16 09:58, Denis V. Lunev wrote:
> This is mandatory for correct backup creation. In the other case the
> content under this area would be lost.
> 
> Dirty bits are set exactly like in bdrv_aligned_pwritev, i.e. they are set
> even if notifier has returned a error.
> 
> Signed-off-by: Denis V. Lunev <den@openvz.org>
> CC: Vladimir Sementsov-Ogievskiy<vsementsov@virtuozzo.com>
> CC: Stefan Hajnoczi <stefanha@redhat.com>
> CC: Fam Zheng <famz@redhat.com>
> CC: Kevin Wolf <kwolf@redhat.com>
> CC: Max Reitz <mreitz@redhat.com>
> ---
>  block/io.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/block/io.c b/block/io.c
> index 513bd99..92d9fe3 100644
> --- a/block/io.c
> +++ b/block/io.c
> @@ -2266,6 +2266,11 @@ int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num,
>      tracked_request_begin(&req, bs, NULL, sector_num << BDRV_SECTOR_BITS,
>                            nb_sectors << BDRV_SECTOR_BITS, BDRV_TRACKED_DISCARD);
>  
> +    ret = notifier_with_return_list_notify(&bs->before_write_notifiers, &req);
> +    if (ret < 0) {
> +        goto out;
> +    }
> +
>      max_discard = MIN_NON_ZERO(bs->bl.max_discard, BDRV_REQUEST_MAX_SECTORS);
>      while (nb_sectors > 0) {
>          int ret;
> -- 
> 2.5.0
> 

Reviewed-by: Fam Zheng <famz@redhat.com>