linux-kernel - Re: [PATCH v3] SUNRPC: set desired file system root before connecting local transports

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Date:	Wed, 14 Nov 2012 16:54:26 -0500
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	"Myklebust, Trond" <Trond.Myklebust@...app.com>
Cc:	Stanislav Kinsbursky <skinsbursky@...allels.com>,
	Christoph Hellwig <hch@...radead.org>,
	"linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...nvz.org" <devel@...nvz.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH v3] SUNRPC: set desired file system root before
 connecting local transports

On Wed, Nov 14, 2012 at 09:51:33PM +0000, Myklebust, Trond wrote:
> On Wed, 2012-11-14 at 16:42 -0500, J. Bruce Fields wrote:
> > Simo's patches use them for upcalls to svcgssd.  Those will always be
> > done from server threads.
> 
> Any reason why you can't set that up when you start nfsd?

Oh, right, I was thinking of the upcalls themselves--right, the connect
we should be able to do on server start, I agree.

> 
> > > If not, then let's just move
> > > the AF_LOCAL connection back into the process context and out of rpciod.
> > 
> > Remind me how this helps?
> 
> rpciod shares the 'init' process net namespace and chroot properties.
> If, however you call bind() from the (containerised) process that was
> used to start nfsd, then you will be using filesystem root (and net
> namespace) of that container.

Got it.

--b.

> 
> > --b.
> > 
> > > 
> > > That implies that the process needs to be privileged, but it needs
> > > privileges in order to start RPC daemons anyway.
> 
> -- 
> Trond Myklebust
> Linux NFS client maintainer
> 
> NetApp
> Trond.Myklebust@...app.com
> www.netapp.com
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