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

[Miklos Szeredi]

On Thu, 14 Sept 2023 at 11:36, Christian Brauner <brauner@xxxxxxxxxx> wrote:
>
> > 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...

Agreed.  The old ID is mostly useful for human interaction.

>
> > 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.

Okay.

But I'd still leave the 2^32 offset for human confusion avoidance.

Thanks,
Miklos