linux-kernel - Re: [PATCH] f2fs: fix to enable compress for newly created file if extension matches

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Date:   Wed, 9 Nov 2022 21:57:14 +0800
From:   Chao Yu <chao@...nel.org>
To:     Sheng Yong <shengyong@...o.com>, jaegeuk@...nel.org
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] f2fs: fix to enable compress for newly created file if
 extension matches

On 2022/11/9 19:01, Sheng Yong wrote:
> If compress_extension is set, and a newly created file matches the
> extension, the file could be marked as compression file. However,
> if inline_data is also enabled, there is no chance to check its
> extension since f2fs_should_compress() always returns false.
> 
> So if a new file is created (its inode has I_NEW flag and must have
> no pin/atomic/swap flag), instead of calling f2fs_should_compress(),
> checking its file type is enough here.
> 
> Signed-off-by: Sheng Yong <shengyong@...o.com>
> ---
>   fs/f2fs/namei.c | 7 ++++++-
>   1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
> index e104409c3a0e5..99dbd051ae0ba 100644
> --- a/fs/f2fs/namei.c
> +++ b/fs/f2fs/namei.c
> @@ -295,9 +295,14 @@ static void set_compress_inode(struct f2fs_sb_info *sbi, struct inode *inode,
> 
>          if (!f2fs_sb_has_compression(sbi) ||
>                          F2FS_I(inode)->i_flags & F2FS_NOCOMP_FL ||
> -                       !f2fs_may_compress(inode) ||
>                          (!ext_cnt && !noext_cnt))
>                  return;
> +       if (inode->i_state & I_NEW) {
> +               if (!S_ISREG(inode->i_mode))
> +                       return;
> +       } else if (!f2fs_may_compress(inode)) {
> +               return;
> +       }

How about moving set_compress_inode() into f2fs_new_inode()?

	if (f2fs_sb_has_compression(sbi)) {
		/* Inherit the compression flag in directory */
		if ((F2FS_I(dir)->i_flags & F2FS_COMPR_FL) &&
					f2fs_may_compress(inode))
			set_compress_context(inode);

		set_compress_inode(sbi, inode, name);
	}

	/* Should enable inline_data after compression set */
	if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
		set_inode_flag(inode, FI_INLINE_DATA);

> 
>          f2fs_down_read(&sbi->sb_lock);
> 
> --
> 2.25.1