linux-kernel - Re: [RFC PATCH 5/8] KEYS: exec request-key within the requesting task's init namespace

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Message-ID: <20150220135815.359730e6@tlielax.poochiereds.net>
Date:	Fri, 20 Feb 2015 13:58:15 -0500
From:	Jeff Layton <jeff.layton@...marydata.com>
To:	ebiederm@...ssion.com (Eric W. Biederman)
Cc:	"J. Bruce Fields" <bfields@...ldses.org>,
	Ian Kent <ikent@...hat.com>,
	David Howells <dhowells@...hat.com>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <onestero@...hat.com>,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	Benjamin Coddington <bcodding@...hat.com>,
	Al Viro <viro@...IV.linux.org.uk>
Subject: Re: [RFC PATCH 5/8] KEYS: exec request-key within the requesting
 task's init namespace

On Fri, 20 Feb 2015 12:07:15 -0600
ebiederm@...ssion.com (Eric W. Biederman) wrote:

> "J. Bruce Fields" <bfields@...ldses.org> writes:
> 
> > On Fri, Feb 20, 2015 at 05:33:25PM +0800, Ian Kent wrote:
> 
> >> The case of nfsd state-recovery might be similar but you'll need to help
> >> me out a bit with that too.
> >
> > Each network namespace can have its own virtual nfs server.  Servers can
> > be started and stopped independently per network namespace.  We decide
> > which server should handle an incoming rpc by looking at the network
> > namespace associated with the socket that it arrived over.
> >
> > A server is started by the rpc.nfsd command writing a value into a magic
> > file somewhere.
> 
> nit.  Unless I am completely turned around that file is on the nfsd
> filesystem, that lives in fs/nfsd/nfs.c. 
> 

Correct.

> So I bevelive this really is a case of figuring out what we want the
> semantics to be for mount and propogating the information down from
> mount to where we call the user mode helpers.
> 

Hmmm. I'm a little confused here. Are you saying that the namespace for
nfsd's upcalls umh ought to be derived from the process that did the
initial mount of /proc/fs/nfsd ?

-- 
Jeff Layton <jeff.layton@...marydata.com>
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