linux-kernel - Re: [PATCH] f2fs: avoid needless inode updates

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Message-ID: <20170902010524.GA23704@jaegeuk-macbookpro.roam.corp.google.com>
Date:   Fri, 1 Sep 2017 18:05:24 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [PATCH] f2fs: avoid needless inode updates

Please ignore this patch.

Thanks,

On 09/01, Jaegeuk Kim wrote:
> If i_size wan't change at all, we don't need to write inode during fsync.
> 
> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> ---
>  fs/f2fs/f2fs.h | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 4b993961d81d..0d76b572484a 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -2267,11 +2267,11 @@ static inline bool f2fs_skip_inode_update(struct inode *inode, int dsync)
>  		spin_unlock(&sbi->inode_lock[DIRTY_META]);
>  		return ret;
>  	}
> -	if (!is_inode_flag_set(inode, FI_AUTO_RECOVER) ||
> -			file_keep_isize(inode) ||
> -			i_size_read(inode) & PAGE_MASK)
> -		return false;
> -	return F2FS_I(inode)->last_disk_size == i_size_read(inode);
> +	if (F2FS_I(inode)->last_disk_size == i_size_read(inode))
> +		return true;
> +
> +	return is_inode_flag_set(inode, FI_AUTO_RECOVER) &&
> +		!file_keep_isize(inode) && !(i_size_read(inode) & PAGE_MASK);
>  }
>  
>  static inline int f2fs_readonly(struct super_block *sb)
> -- 
> 2.14.0.rc1.383.gd1ce394fe2-goog