From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH 3/3] nfsd: vfs_llseek() with O_32BITHASH or O_64BITHASH
Date: Thu, 28 Jul 2011 07:46:59 -0400
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Cc: Christoph Hellwig <hch@infradead.org>, linux-nfs@vger.kernel.org,
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	yong.fan@whamcloud.com, adilger@whamcloud.com, tytso@mit.edu
To: Bernd Schubert <bernd.schubert@itwm.fraunhofer.de>
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On Thu, Jul 28, 2011 at 11:19:07AM +0200, Bernd Schubert wrote:
> before I'm going to work further on the patch sets, I have few
> questions first. Could you please help me with that?
> 
> file->f_mode is set in __dentry_open() based on O_ flags.

Or right after dentry_open, before anyone can possibly grab a reference
to the file.  Just do that in nfsd_open based on an NFSD_MAY_ flag.