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

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Date:	Tue, 06 Jan 2009 16:07:59 -0800
From:	Matt Helsley <matthltc@...ibm.com>
To:	"J. Bruce Fields" <bfields@...ldses.org>
Cc:	Trond Myklebust <trond.myklebust@....uio.no>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Serge E. Hallyn" <serue@...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, 2009-01-06 at 18:53 -0500, J. Bruce Fields wrote:
> On Tue, Jan 06, 2009 at 06:35:43PM -0500, Trond Myklebust wrote:
> > On Tue, 2009-01-06 at 18:32 -0500, J. Bruce Fields wrote:
> > > 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?
> > 
> > So how does tracking it in a shared structure like the rpc_client help?
> > If you consider it to be part of the cred, then it needs to be tracked
> > in the cred...
> 
> Right, that's what I meant.
> 
> It seems like overkill, though.  Does anyone actually care whether these
> names are right?

That's certainly a tempting angle. However we may not "control" the
server code -- couldn't there be some oddball (maybe even proprietary)
NFS servers out there that users do care about interacting with?

Cheers,
	-Matt Helsley


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