[CRIU] Sync TODO-s for mount.c work

[Tycho Andersen]

On Wed, Apr 22, 2015 at 07:48:25PM +0200, Oleg Nesterov wrote:
> On 04/22, Tycho Andersen wrote:
> >
> > On Wed, Apr 22, 2015 at 07:17:36PM +0200, Oleg Nesterov wrote:
> > > > Anyway, yes, it
> > > > could do MS_BIND with some sharing flags, I think we just haven't
> > > > implemented that yet (this isn't an external mount, since it's bound
> > > > within the namespace).
> > >
> > > _Yes_ thanks. So can't we teach "auto" to do this?
> > >
> > > OK, OK, perhaps we should not abuse --ext-mount-map option for that,
> > > but this is minor.
> >
> > Yes, we can, except that the current autodetection doesn't work if the
> > mounts are the "same" mount as you described in the other thread.
> 
> Yes, yes,
> 
> > We
> > could have some other option that knows how to do this, though (or
> > figure out how to detect the "same" mounts somehow and remove this
> > restriction).
> 
> To me, "remove this restriction" makes much more sense. In fact, this
> restriction looks like a bug to me.
> 
> Once again, in this particular case "auto" will wrongly treat all
> mounts (except /) as a bind mount. This just means that you can never
> use this option if the process inherits some mntpoint from parent ns.

Right. Does the requiring pivot_root patch mask this for now?

And a second question, any ideas on how to fix this? :)

Tycho

> Oleg.
>