linux-kernel - Re: [RFC PATCH 1/3] add unique mount ID

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Date:   Thu, 14 Sep 2023 11:36:35 +0200
From:   Christian Brauner <brauner@...nel.org>
To:     Miklos Szeredi <miklos@...redi.hu>
Cc:     Miklos Szeredi <mszeredi@...hat.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-api@...r.kernel.org, linux-man@...r.kernel.org,
        linux-security-module@...r.kernel.org, Karel Zak <kzak@...hat.com>,
        Ian Kent <raven@...maw.net>,
        David Howells <dhowells@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <christian@...uner.io>,
        Amir Goldstein <amir73il@...il.com>
Subject: Re: [RFC PATCH 1/3] add unique mount ID

> Yes, one concern is that humans confuse the old and the new ID.
> 
> I also think it makes sense to allow the new interfaces to look up the
> mount based on either the old or the new ID.   But I could be wrong

Hm, mount id recycling may happen so quickly that for service restarts
with a lot of mounts this becomes mostly useless...

> there, since that might encourage bad code.  Maybe the new interface
> should only use take the new ID, which means no mixed use of
> /proc/$$/mountinfo and statmnt/listmnt.

... so I think that is indeed the better way of doing things. There's no
need to encourage userspace to mix both identifiers.