From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201])
	(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
	(No client certificate requested)
	by smtp.subspace.kernel.org (Postfix) with ESMTPS id EAE442FE04E
	for <linux-kernel@vger.kernel.org>; Tue,  9 Dec 2025 01:47:36 +0000 (UTC)
Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201
ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;
	t=1765244857; cv=none; b=rATpjRT9JZkFxLZ3e2WBJ9A/8HuW7g3ckJrDMsJMu5I8ONCCR3K8Qsk9LM2dwFMDAgQlax2ryQ/cWj/5SI8Km9q2KpRpCHU9SoDpwcq8VknwfvLz1pPYR5AMGwyxAjzrsJ5U7uTNDha6rh/y4/txWc+3CRHaSSqkud/+dViPzTg=
ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org;
	s=arc-20240116; t=1765244857; c=relaxed/simple;
	bh=4cKepWPJcFwPX4THOx/vqYkh+UCHtZ7kDQ2aqoDPkm4=;
	h=Date:From:To:Cc:Subject:Message-Id:In-Reply-To:References:
	 Mime-Version:Content-Type; b=r7yx92s9Uf6Sh7MBdqzs4mwQnzXQuZWGiiwAR2Grdm/Ds3xkSZbR5G/si3YzOCanmEgDowxzrD6NtaZKT/V4Tq3M/3S8zreWaKiA3PezwzaKrPeRNkWc9hNxtrCQ6M5G6wUL8xkpl17QV9qP+BsEPVz4QMQ0N5wZq96hu6KTpjo=
ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=d+DcxBjg; arc=none smtp.client-ip=10.30.226.201
Authentication-Results: smtp.subspace.kernel.org;
	dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="d+DcxBjg"
Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5B769C4CEF1;
	Tue,  9 Dec 2025 01:47:36 +0000 (UTC)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org;
	s=korg; t=1765244856;
	bh=4cKepWPJcFwPX4THOx/vqYkh+UCHtZ7kDQ2aqoDPkm4=;
	h=Date:From:To:Cc:Subject:In-Reply-To:References:From;
	b=d+DcxBjg5jtSOTqE0qSB+K/QhwVBgzF+xRAiQmVy2Jcv25IRmejK0ZvuvXCb4MVYZ
	 rltceVBT3mjL/bFp1ljSmf6rATb1gn7Z4jNELn9jVdWxCGqzNVWCZcqI648xY0ZU4N
	 34mK/77uPBCNxsxVKSQe3j6hNKkJxULaiKOG+DxU=
Date: Mon, 8 Dec 2025 17:47:35 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Ahelenia =?UTF-8?B?WmllbWlhxYRza2E=?=
 <nabijaczleweli@nabijaczleweli.xyz>
Cc: Hugh Dickins <hughd@google.com>, Baolin Wang
 <baolin.wang@linux.alibaba.com>, Matthew Wilcox <willy@infradead.org>,
 linux-mm@kvack.org, linux-kernel@vger.kernel.org, Christian Brauner
 <brauner@kernel.org>
Subject: Re: [PATCH v2] tmpfs: enforce the immutable flag on open files
Message-Id: <20251208174735.35aef48b1a15a2d08e073bd0@linux-foundation.org>
In-Reply-To: <toyfbuhwbqa4zfgnojghr4v7k2ra6uh3g3sikbuwata3iozi3m@tarta.nabijaczleweli.xyz>
References: <toyfbuhwbqa4zfgnojghr4v7k2ra6uh3g3sikbuwata3iozi3m@tarta.nabijaczleweli.xyz>
X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu)
Precedence: bulk
X-Mailing-List: linux-kernel@vger.kernel.org
List-Id: <linux-kernel.vger.kernel.org>
List-Subscribe: <mailto:linux-kernel+subscribe@vger.kernel.org>
List-Unsubscribe: <mailto:linux-kernel+unsubscribe@vger.kernel.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

On Mon, 8 Dec 2025 22:50:15 +0100 Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> wrote:

> This useful behaviour is implemented for most filesystems,
> and wants to be implemented for every filesystem, quoth ref:
>   There is general agreement that we should standardize all file systems
>   to prevent modifications even for files that were opened at the time
>   the immutable flag is set.  Eventually, a change to enforce this at
>   the VFS layer should be landing in mainline.

This changes the VFS parts of tmpfs, not the MM parts.  So please
resend and also cc

linux-fsdevel@vger.kernel.org
Christian Brauner <brauner@kernel.org>