linux-kernel - Re: [PATCH v2] f2fs: fix normal discard process

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Date:   Tue, 25 Oct 2022 17:54:51 +0800
From:   Chao Yu <chao@...nel.org>
To:     zhangdongdong <zhangdongdong1@...o.com>, jaegeuk@...nel.org
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] f2fs: fix normal discard process

On 2022/10/25 17:40, zhangdongdong wrote:
> From: Dongdong Zhang <zhangdongdong1@...o.com>
> 
> In the DPOLICY_BG mode, there is a conflict between
> the two conditions "i + 1 < dpolicy->granularity" and
> "i < DEFAULT_DISCARD_GRANULARITY". If i = 15, the first
> condition is false, it will enter the second condition
> and dispatch all small granularity discards in function
>   __issue_discard_cmd_orderly. The restrictive effect
> of the first condition to small discards will be
> invalidated. These two conditions should align.
> 
> Fixes: 20ee4382322c ("f2fs: issue small discard by LBA order")
> Signed-off-by: Dongdong Zhang <zhangdongdong1@...o.com>

Reviewed-by: Chao Yu <chao@...nel.org>

Thanks,