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

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Message-ID: <4D1C4C7C.6050606@parallels.com>
Date:	Thu, 30 Dec 2010 03:10:20 -0600
From:	Rob Landley <rlandley@...allels.com>
To:	"Kirill A. Shutemov" <kas@...nvz.org>
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 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?

> 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?

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...

Rob
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