linux-kernel - Re: [RFC][PATCH 2/4] sunrpc: Use utsnamespaces

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Date:	Tue, 6 Jan 2009 18:32:38 -0500
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Trond Myklebust <trond.myklebust@....uio.no>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Serge E. Hallyn" <serue@...ibm.com>,
	Matt Helsley <matthltc@...ibm.com>,
	Linux Containers <containers@...ts.linux-foundation.org>,
	linux-nfs@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Chuck Lever <chuck.lever@...cle.com>,
	Linux Containers <containers@...ts.osdl.org>,
	Cedric Le Goater <clg@...ibm.com>
Subject: Re: [RFC][PATCH 2/4] sunrpc: Use utsnamespaces

On Tue, Jan 06, 2009 at 06:15:34PM -0500, Trond Myklebust wrote:
> On Tue, 2009-01-06 at 15:04 -0800, Eric W. Biederman wrote:
> > That implies to me you want to capture the value at mount time, and to
> > pass it in to the rpc_call creation, and only at very specific well
> > defined points where we interact with user space should we examine
> > current->utsname().  At which point there should be no question
> > of current->utsname() is valid as the user space process is alive.
> 
> Why pretend that the filesystem is owned by a particular namespace? It
> can, and will be shared among many containers...

If the only purpose of this is to fill in the auth_unix cred then
shouldn't it be part of whatever cred structures are passed around?

But I doubt it's that important to get it right.

--b.
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