linux-kernel - Re: [PATCH v2] tmpfs: enforce the immutable flag on open files

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Message-Id: <20251208174735.35aef48b1a15a2d08e073bd0@linux-foundation.org>
Date: Mon, 8 Dec 2025 17:47:35 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Ahelenia Ziemiańska
 <nabijaczleweli@...ijaczleweli.xyz>
Cc: Hugh Dickins <hughd@...gle.com>, Baolin Wang
 <baolin.wang@...ux.alibaba.com>, Matthew Wilcox <willy@...radead.org>,
 linux-mm@...ck.org, linux-kernel@...r.kernel.org, Christian Brauner
 <brauner@...nel.org>
Subject: Re: [PATCH v2] tmpfs: enforce the immutable flag on open files

On Mon, 8 Dec 2025 22:50:15 +0100 Ahelenia Ziemiańska <nabijaczleweli@...ijaczleweli.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@...r.kernel.org
Christian Brauner <brauner@...nel.org>