[RFC PATCH 1/3] add unique mount ID

[Christian Brauner]

> 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.