Re: [RFC 1/5] user namespaces: Add a user_namespace as creator/owner of uts_namespace

[Serge Hallyn <serge.hallyn@canonical.com>]

Quoting Alexey Dobriyan (adobriyan@gmail.com):
> On Fri, Dec 17, 2010 at 5:24 PM, Serge E. Hallyn <serge@hallyn.com> wrote:
> > +/*
> > + * userns count is 1 for root user, 1 for init_uts_ns,
> > + * and 1 for... ?
> > + */
> >  struct user_namespace init_user_ns = {
> >        .kref = {
> > -               .refcount       = ATOMIC_INIT(2),
> > +               .refcount       = ATOMIC_INIT(3),
> 
> +1 is for init_nsproxy ;-)

Hmm, actually user_namespace isn't in struct nsproxy any more,
since 18b6e0414e42d95183f07d8177e3ff0241abd825.

I think my original thought was that init_user_ns is pinned twice by
root_user - once as creator and once as the root user in it.  In
which case it isn't right - the user_ns pins the task which created
it, the creator does not pin the user_ns it creates.

-serge