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From: Christoph Hellwig <hch@lst.de>
Subject: Re: [patch] fs: fix d_validate
Date: Tue, 16 Nov 2010 17:25:13 +0100
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Cc: Nick Piggin <npiggin@kernel.dk>, linux-fsdevel@vger.kernel.org,
	Al Viro <viro@zeniv.linux.org.uk>,
	Christoph Hellwig <hch@lst.de>
To: Linus Torvalds <torvalds@linux-foundation.org>
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On Tue, Nov 16, 2010 at 08:20:52AM -0800, Linus Torvalds wrote:
> Hmm. Iirc (and it's possible that I don't) the original reason for the
> whole kmem_ptr_validate() was for nfsd sending dentry pointers back
> and forth as part of the FH.

If it did that it's been a long time ago, pre-2.4 at least.  In addition
to that since the introduction of export operations we can't NFS-export
either ncpfs or smbfs anyway.