linux-kernel - Re: [Devel] Re: [patch 05/10] add "permit user mounts in new namespace" clone flag

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Message-Id: <1176922847.6796.127.camel@heimdal.trondhjem.org>
Date:	Wed, 18 Apr 2007 15:00:47 -0400
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Miklos Szeredi <miklos@...redi.hu>, ebiederm@...ssion.com,
	serue@...ibm.com, linuxram@...ibm.com,
	linux-fsdevel@...r.kernel.org, viro@....linux.org.uk,
	containers@...ts.osdl.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [Devel] Re: [patch 05/10] add "permit user mounts in new
	namespace" clone flag

On Wed, 2007-04-18 at 16:01 +0100, Christoph Hellwig wrote:
> I suspect the right answer here is to make nfs mount handling smarter.
> The way mounting works the filesystem is allowed to choose whether it
> can re-used a superblock or needs a new one.  In the NFS case we probably
> want to allow multiple superblocks for the same export if important
> paramaters like the security model mismatch.

It might also be another application for layering. If I were able to
share enough of the inode and dentry information between superblocks,
then all sorts of interesting possibilities arise...

Cheers
  Trond

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