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b=d+DcxBjg5jtSOTqE0qSB+K/QhwVBgzF+xRAiQmVy2Jcv25IRmejK0ZvuvXCb4MVYZ rltceVBT3mjL/bFp1ljSmf6rATb1gn7Z4jNELn9jVdWxCGqzNVWCZcqI648xY0ZU4N 34mK/77uPBCNxsxVKSQe3j6hNKkJxULaiKOG+DxU= Date: Mon, 8 Dec 2025 17:47:35 -0800 From: Andrew Morton To: Ahelenia =?UTF-8?B?WmllbWlhxYRza2E=?= Cc: Hugh Dickins , Baolin Wang , Matthew Wilcox , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Christian Brauner Subject: Re: [PATCH v2] tmpfs: enforce the immutable flag on open files Message-Id: <20251208174735.35aef48b1a15a2d08e073bd0@linux-foundation.org> In-Reply-To: References: X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: B742680002 X-Stat-Signature: 5q4gocoszhj78ugyrogzh4x5b49kq8g8 X-Rspam-User: X-HE-Tag: 1765244857-623491 X-HE-Meta: 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 dEecU/0+ rkL1RZPxCit+4LiT+ToNFPJv2C3Op1LxI7nUEYWszN/M7MQHPKCXAsLLtCuzLYn6HVWEoeFDIR0sEvgPLWOiSLmOj98mTDpgFFf4W7aubmgD5X5lvzUdiyLa9ViMFOOWeyDsAl5iMtJsz0sIhqLz+ZV7s1+4e4HcVnmLvUCj+fjHQLKrubnmmbRSABrhc8fcs5vFg8rtck9myD+pj8bYq1fiiScv4SHL5L0Y9IOWVuyGao19bgWH3nj1PJs0N6+VvBVGf651MW/nw+Bvb02VqVe0YNSYtmXbBj+dFb4VrUm79VcFqBxRhdN8Pm4bAy+J15EnHPHX0pdEwFE47ws6Ue2CQjzT+HvILK+jhaXV2oc9YBggh6fR7/LnaTzcle2NXf3bg X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, 8 Dec 2025 22:50:15 +0100 Ahelenia Ziemiańska 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