linux-kernel - Re: [f2fs-dev] [PATCH v3 1/2] f2fs: change i_compr

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Message-ID: <7b3d9b1f-2394-6163-ada5-63e9a053475d@kernel.org>
Date:   Tue, 8 Sep 2020 22:55:59 +0800
From:   Chao Yu <chao@...nel.org>
To:     Daeho Jeong <daeho43@...il.com>, linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, kernel-team@...roid.com
Cc:     Daeho Jeong <daehojeong@...gle.com>
Subject: Re: [f2fs-dev] [PATCH v3 1/2] f2fs: change i_compr_blocks of inode to
 atomic value

On 2020-9-8 10:44, Daeho Jeong wrote:
> From: Daeho Jeong <daehojeong@...gle.com>
>
> writepages() can be concurrently invoked for the same file by different
> threads such as a thread fsyncing the file and a kworker kernel thread.
> So, changing i_compr_blocks without protection is racy and we need to
> protect it by changing it with atomic type value. Plus, we don't need
> a 64bit value for i_compr_blocks, so just we will use a atomic value,
> not atomic64.
>
> Signed-off-by: Daeho Jeong <daehojeong@...gle.com>

Reviewed-by: Chao Yu <yuchao0@...wei.com>

Thanks,