linux-kernel - Re: [PATCH v2 00/12] make rpc_pipefs be mountable multiple time

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Message-ID: <20101230094433.GB29697@shutemov.name>
Date:	Thu, 30 Dec 2010 11:44:33 +0200
From:	"Kirill A. Shutemov" <kas@...nvz.org>
To:	Rob Landley <rlandley@...allels.com>
Cc:	Rob Landley <rob@...dley.net>,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Neil Brown <neilb@...e.de>,
	Pavel Emelyanov <xemul@...allels.com>,
	linux-nfs@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 00/12] make rpc_pipefs be mountable multiple time

On Thu, Dec 30, 2010 at 03:10:20AM -0600, Rob Landley wrote:
> On 12/30/2010 02:51 AM, Kirill A. Shutemov wrote:
> > On Wed, Dec 29, 2010 at 08:13:50PM -0600, Rob Landley wrote:
> >> On Wed, Dec 29, 2010 at 7:14 AM, Kirill A. Shutemov<kas@...nvz.org>  wrote:
> >>>
> >>> Prepare nfs/sunrpc stack to use multiple instances of rpc_pipefs.
> >>> Only for client for now.
> >>
> >> What would a test case for this look like?  (Is there some way to tell
> >> an nfs mount to use a specific instance of rpc_pipefs or something?)
> >
> > You can create a new instance of rpc_pipefs using 'newinstance'
> > mountoption.
> >
> > Then you can specify which rpc_pipefs to use with 'rpcmount' mountoption
> > of nfs mount. If none specifed, '/var/lib/nfs/rpc_pipefs' uses by default.
> 
> That path is as the process performing the mount sees it?

Yep.

> > If no rpcmount mountoption, no rpc_pipefs was found at
> > '/var/lib/nfs/rpc_pipefs' and we are in init's mount namespace, we use
> > init_rpc_pipefs.
> 
> It's the "we are in init's mount namespace" that I was wondering about.
> 
> So if I naievely chroot, nfs mount stops working the way it did before I 
> chrooted unless I do an extra setup step?

No. It will work as before since you are still in init's mount namespace.
Creating new mount namespace changes rules.

> I'm actually poking at getting nfs mount working in LXC containers with 
> different network routing (mostly study so far, it took me a couple 
> weeks just to get lxc to work for me and now I'm trying to wrap my head 
> around Linux's NFS implementation), so I'm very interested in this...

-- 
 Kirill A. Shutemov
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