linux-kernel - Re: [PATCH v2 12/92] exfat: convert to simple_rename

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Message-ID: <20230706103909.jclg3nvltflqgwo2@quack3>
Date:   Thu, 6 Jul 2023 12:39:09 +0200
From:   Jan Kara <jack@...e.cz>
To:     Jeff Layton <jlayton@...nel.org>
Cc:     Christian Brauner <brauner@...nel.org>,
        Namjae Jeon <linkinjeon@...nel.org>,
        Sungjong Seo <sj1557.seo@...sung.com>,
        Al Viro <viro@...iv.linux.org.uk>, Jan Kara <jack@...e.cz>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 12/92] exfat: convert to simple_rename_timestamp

On Wed 05-07-23 15:00:37, Jeff Layton wrote:
> A rename potentially involves updating 4 different inode timestamps.
> Convert to the new simple_rename_timestamp helper function.
> 
> Signed-off-by: Jeff Layton <jlayton@...nel.org>
> ---
>  fs/exfat/namei.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/exfat/namei.c b/fs/exfat/namei.c
> index d9b46fa36bff..e91022ff80ef 100644
> --- a/fs/exfat/namei.c
> +++ b/fs/exfat/namei.c
> @@ -1312,8 +1312,8 @@ static int exfat_rename(struct mnt_idmap *idmap,
>  		goto unlock;
>  
>  	inode_inc_iversion(new_dir);
> -	new_dir->i_ctime = new_dir->i_mtime = new_dir->i_atime =
> -		EXFAT_I(new_dir)->i_crtime = current_time(new_dir);
> +	simple_rename_timestamp(old_dir, old_dentry, new_dir, new_dentry);
> +	EXFAT_I(new_dir)->i_crtime = current_time(new_dir);

Hum, you loose atime update with this. Not that it would make sense to have
it but it would probably deserve a comment in the changelog.

Also why you use current_time(new_dir) here instead of say inode->i_ctime?

>  	exfat_truncate_atime(&new_dir->i_atime);
>  	if (IS_DIRSYNC(new_dir))
>  		exfat_sync_inode(new_dir);
> @@ -1336,7 +1336,6 @@ static int exfat_rename(struct mnt_idmap *idmap,
>  	}
>  
>  	inode_inc_iversion(old_dir);
> -	old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
>  	if (IS_DIRSYNC(old_dir))
>  		exfat_sync_inode(old_dir);
>  	else

Also there is:

                new_inode->i_ctime = EXFAT_I(new_inode)->i_crtime =
                        current_time(new_inode);

in exfat_rename() from which you can remove the ctime update?

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR