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

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Message-ID: <4D22362F.2040604@parallels.com>
Date:	Mon, 3 Jan 2011 14:48:47 -0600
From:	Rob Landley <rlandley@...allels.com>
To:	Trond Myklebust <Trond.Myklebust@...app.com>
CC:	"Kirill A. Shutemov" <kas@...nvz.org>,
	Rob Landley <rob@...dley.net>,
	"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 12/31/2010 10:54 AM, Trond Myklebust wrote:
>> I'm kind of surprised that the kernel cares about a specific path under
>> /var/lib.  (Seems like policy in the kernel somehow.)  Can't it just
>> check the current process's mount list to see if an instance of
>> rpc_pipefs is mounted in the current namespace the way lxc looks for
>> cgroups?  Or are there potential performance/scalability issues with that?
>
> The kernel doesn't give a damn about the /var/lib/nfs/rpc_pipefs bit.
> That's all for the benefit of the userland utilities.

Are you saying that if you go into a container and that mount point 
doesn't exist, the kernel will still be able to find and use rpc_pipefs? 
  Without userspace creating a specific magic path and mounting a 
filesystem on it?

If so, I misread the patch...

Rob

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