linux-kernel - Re: [malware-list] TALPA - a threat model? well sorta.

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Message-ID: <20080814194111.GH22488@mit.edu>
Date:	Thu, 14 Aug 2008 15:41:11 -0400
From:	Theodore Tso <tytso@....edu>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Eric Paris <eparis@...hat.com>, tvrtko.ursulin@...hos.com,
	alan@...rguk.ukuu.org.uk, andi@...stfloor.org,
	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, malware-list@...ts.printk.net,
	malware-list-bounces@...sg.printk.net, peterz@...radead.org,
	viro@...IV.linux.org.uk
Subject: Re: [malware-list] TALPA - a threat model?  well sorta.

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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