linux-kernel - Re: [PATCH] proc: remove mark_inode_dirty() in proc_notify

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Message-Id: <20230112144323.2fa71c10876c0f5e0b5321a4@linux-foundation.org>
Date:   Thu, 12 Jan 2023 14:43:23 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Chao Yu <chao@...nel.org>
Cc:     adobriyan@...il.com, viro@...iv.linux.org.uk,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] proc: remove mark_inode_dirty() in proc_notify_change()

On Thu, 12 Jan 2023 11:27:20 +0800 Chao Yu <chao@...nel.org> wrote:

> proc_notify_change() has updated i_uid, i_gid and i_mode into proc
> dirent, we don't need to call mark_inode_dirty() for later writeback,
> remove it.
> 
> --- a/fs/proc/generic.c
> +++ b/fs/proc/generic.c
> @@ -127,7 +127,6 @@ static int proc_notify_change(struct user_namespace *mnt_userns,
>  		return error;
>  
>  	setattr_copy(&init_user_ns, inode, iattr);
> -	mark_inode_dirty(inode);
>  
>  	proc_set_user(de, inode->i_uid, inode->i_gid);
>  	de->mode = inode->i_mode;

procfs call mark_inode_dirty() in three places.

Does mark_inode_dirty() of a procfs file actually serve any purpose?