linux-kernel - Re: [PATCH] f2fs: fix to remove F2FS_COMPR_FL and tag F2FS_NOCOMP

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Date:   Wed, 6 Jul 2022 22:21:07 +0800
From:   Chao Yu <chao@...nel.org>
To:     Chao Liu <chaoliu719@...il.com>, Jaegeuk Kim <jaegeuk@...nel.org>
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, Yue Hu <huyue2@...lpad.com>,
        Wayne Zhang <zhangwen@...lpad.com>,
        Xiaoyu Qi <qxy65535@...il.com>, Chao Liu <liuchao@...lpad.com>
Subject: Re: [PATCH] f2fs: fix to remove F2FS_COMPR_FL and tag F2FS_NOCOMP_FL
 at the same time

On 2022/6/21 14:48, Chao Liu wrote:
> From: Chao Liu <liuchao@...lpad.com>
> 
> If the inode has the compress flag, it will fail to use
> 'chattr -c +m' to remove its compress flag and tag no compress flag.
> However, the same command will be successful when executed again,
> as shown below:
> 
>    $ touch foo.txt
>    $ chattr +c foo.txt
>    $ chattr -c +m foo.txt
>    chattr: Invalid argument while setting flags on foo.txt
>    $ chattr -c +m foo.txt
>    $ f2fs_io getflags foo.txt
>    get a flag on foo.txt ret=0, flags=nocompression,inline_data
> 
> Fix this by removing some checks in f2fs_setflags_common()
> that do not affect the original logic. I go through all the
> possible scenarios, and the results are as follows. Bold is
> the only thing that has changed.
> 
> +---------------+-----------+-----------+----------+
> |               |            file flags            |
> + command       +-----------+-----------+----------+
> |               | no flag   | compr     | nocompr  |
> +---------------+-----------+-----------+----------+
> | chattr +c     | compr     | compr     | -EINVAL  |
> | chattr -c     | no flag   | no flag   | nocompr  |
> | chattr +m     | nocompr   | -EINVAL   | nocompr  |
> | chattr -m     | no flag   | compr     | no flag  |
> | chattr +c +m  | -EINVAL   | -EINVAL   | -EINVAL  |
> | chattr +c -m  | compr     | compr     | compr    |
> | chattr -c +m  | nocompr   | *nocompr* | nocompr  |
> | chattr -c -m  | no flag   | no flag   | no flag  |
> +---------------+-----------+-----------+----------+
> 
> Fixes: 4c8ff7095bef ("f2fs: support data compression")
> Signed-off-by: Chao Liu <liuchao@...lpad.com>

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

Thanks,