linux-kernel - Re: [f2fs-dev] [PATCH] f2fs: compress tmp files given extension

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Date:   Mon, 12 Jun 2023 22:18:17 +0800
From:   Chao Yu <chao@...nel.org>
To:     Jaegeuk Kim <jaegeuk@...nel.org>, linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH] f2fs: compress tmp files given extension

On 2023/6/7 4:36, Jaegeuk Kim wrote:
> Let's compress tmp files for the given extension list.

Could you please check below commit? IIRC, it was introduce to avoid compressing
file which has unpredictable tmp file, e.g. foo.sox.

Could you please describe the case you encounter?

commit 4a67d9b07ac8dce7f1034e0d887f2f4ee00fe118
Author: Chao Yu <chao@...nel.org>
Date:   Tue May 18 17:54:58 2021 +0800

     f2fs: compress: fix to disallow temp extension

     This patch restricts to configure compress extension as format of:

      [filename + '.' + extension]

     rather than:

      [filename + '.' + extension + (optional: '.' + temp extension)]

     in order to avoid to enable compression incorrectly:

     1. compress_extension=so
     2. touch file.soa
     3. touch file.so.tmp

Thanks,

> 
> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> ---
>   fs/f2fs/namei.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
> index 3e35eb7dbb8f..cdc94c8e60f7 100644
> --- a/fs/f2fs/namei.c
> +++ b/fs/f2fs/namei.c
> @@ -161,7 +161,7 @@ static void set_compress_new_inode(struct f2fs_sb_info *sbi, struct inode *dir,
>   
>   	/* Compress wanting extension. */
>   	for (i = 0; i < ext_cnt; i++) {
> -		if (is_extension_exist(name, ext[i], false)) {
> +		if (is_extension_exist(name, ext[i], true)) {
>   			set_compress_context(inode);
>   			return;
>   		}