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

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Message-ID: <877fvc319o.fsf@x220.int.ebiederm.org>
Date:	Fri, 20 Feb 2015 12:07:15 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"J. Bruce Fields" <bfields@...ldses.org>
Cc:	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>,
	Jeff Layton <jeff.layton@...marydata.com>
Subject: Re: [RFC PATCH 5/8] KEYS: exec request-key within the requesting task's init namespace

"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. 

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.

Eric
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