linux-kernel - Re: [PATCH] brd: decrease the number of allocated pages which discarded

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Message-ID: <CAFj5m9LLPEfph+U-0n3p9YeXg8tOeBD2fdZe0HheYVFSsw68xg@mail.gmail.com>
Date: Thu, 28 Nov 2024 18:23:36 +0800
From: Ming Lei <ming.lei@...hat.com>
To: long.yunjian@....com.cn
Cc: axboe@...nel.dk, kbusch@...nel.org, linux-block@...r.kernel.org, 
	linux-kernel@...r.kernel.org, mou.yi@....com.cn, zhang.xianwei8@....com.cn, 
	cai.qu@....com.cn, xu.lifeng1@....com.cn, jiang.xuexin@....com.cn, 
	jiang.yong5@....com.cn
Subject: Re: [PATCH] brd: decrease the number of allocated pages which discarded

On Thu, Nov 28, 2024 at 5:01 PM <long.yunjian@....com.cn> wrote:
>
> From: Zhang Xianwei <zhang.xianwei8@....com.cn>
> The number of allocated pages which discarded will not decrease.
> Fix it.
>
> Fixes: 9ead7efc6f3f ("brd: implement discard support")
>
> Signed-off-by: Zhang Xianwei <zhang.xianwei8@....com.cn>
> ---
>  drivers/block/brd.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/block/brd.c b/drivers/block/brd.c
> index 5a95671d8151..292f127cae0a 100644
> --- a/drivers/block/brd.c
> +++ b/drivers/block/brd.c
> @@ -231,8 +231,10 @@ static void brd_do_discard(struct brd_device *brd, sector_t sector, u32 size)
>         xa_lock(&brd->brd_pages);
>         while (size >= PAGE_SIZE && aligned_sector < rd_size * 2) {
>                 page = __xa_erase(&brd->brd_pages, aligned_sector >> PAGE_SECTORS_SHIFT);
> -               if (page)
> +               if (page) {
>                         __free_page(page);
> +                       brd->brd_nr_pages--;
> +               }

Reviewed-by: Ming Lei <ming.lei@...hat.com>