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Date: Thu, 14 Aug 2008 15:41:11 -0400
From: Theodore Tso <tytso@mit.edu>
To: Christoph Hellwig <hch@infradead.org>
Cc: Eric Paris <eparis@redhat.com>, tvrtko.ursulin@sophos.com,
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Subject: Re: [malware-list] TALPA - a threat model?  well sorta.
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On Thu, Aug 14, 2008 at 03:34:08PM -0400, Christoph Hellwig wrote:
> 
> It's not used at all on regular files except for ext4 with a non-default,
> undocumented mount option.  XFS will grow it soon in a similar way as ext4,
> except that it will be documented or I might have even figured out by
> then how to just enabled it from nfsd.

We do need a standardized way of enabling it (since it does cost you
something in performance, so not everyone will want it on), and a
standardized way of reading i_version out to userspace.  Maybe a mount
option is the right way to do it, maybe not.

We may want to take this to the linux-fs list and try to get
agreements on these points; the main reason why it's not enabled by
default in ext4 is because the NFSv4 advanced caching code is in
common use (is it even in mainline)?

						- Ted
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