linux-kernel - Re: [PATCH v3 09/12] man/man2/open_tree.2: document "new" mount API

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Message-ID: <20250821-adler-beute-47d721cde8a3@brauner>
Date: Thu, 21 Aug 2025 13:33:24 +0200
From: Christian Brauner <brauner@...nel.org>
To: Askar Safin <safinaskar@...omail.com>
Cc: Aleksa Sarai <cyphar@...har.com>, Alejandro Colomar <alx@...nel.org>, 
	"Michael T. Kerrisk" <mtk.manpages@...il.com>, Alexander Viro <viro@...iv.linux.org.uk>, 
	Jan Kara <jack@...e.cz>, "G. Branden Robinson" <g.branden.robinson@...il.com>, 
	linux-man <linux-man@...r.kernel.org>, linux-api <linux-api@...r.kernel.org>, 
	linux-fsdevel <linux-fsdevel@...r.kernel.org>, linux-kernel <linux-kernel@...r.kernel.org>, 
	David Howells <dhowells@...hat.com>
Subject: Re: [PATCH v3 09/12] man/man2/open_tree.2: document "new" mount API

On Thu, Aug 21, 2025 at 03:27:26PM +0400, Askar Safin wrote:
> man open_tree says:
> > mount propagation
> > (as described in
> > .BR mount_namespaces (7))
> > will not be applied to bind-mounts created by
> > .BR open_tree ()
> > until the bind-mount is attached with
> > .BR move_mount (2),
> 
> It seems this is wrong, because this commit exists: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=06b1ce966e3f8bfef261c111feb3d4b33ede0cd8 .
> I'm not sure about this. (I didn't test this.)

No, it's correct. I reverted this because it broke userspace that relies
on this behavior.