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SubjectRe: [PATCH] root-hopping for pre-2.3.41-3
Horst von Brand wrote:
>
> "H. Peter Anvin" <hpa@transmeta.com> said:
> > almesber@lrc.di.epfl.ch wrote:
> > > H. Peter Anvin wrote:
> > > > I would like to suggest an alternate system call with, perhaps, more
> > > > useful semantics:
> > > >
> > > > pivot_root("new_root", "old_root");
> > >
> > > ... with an implicit "chroot everybody on / to /new_root". That would
> > > solve a few problems, yes. I'll give it a try.
>
> > Right... everyone on the old / move to the new /, although I guess
> > that's technically not 100% necessary.
>
> What about mounts under the (now old) root? What if /new_root/usr doesn't
> exist, is not a directory, has something else mounted? What happens with
> open /dev/whatever?
>

1. They stay, now as mounts under /new_root/old_root
2. The system calls return an error.
3. They stay open. It is the responsibility of user space to deal with
this before unmounting the old root.

-hpa

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