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Date: Fri, 27 Sep 2002 10:42:35 -0700
From: Chris Wedgwood <cw@f00f.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: Linus Torvalds <torvalds@transmeta.com>, Andrew Morton <akpm@zip.com.au>,
       Rusty Russell <rusty@rustcorp.com.au>, linux-kernel@vger.kernel.org
Subject: Re: [patch] 'virtual => physical page mapping cache', vcache-2.5.38-B8
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On Fri, Sep 27, 2002 at 07:44:08PM +0200, Ingo Molnar wrote:

> and i'm not quite sure how other users of get_user_pages()
> (direct-IO) handle these kinds of COW races.

O_DIRECT is allow to break if someone does something silly :)  I think
XFS tried hard to make sure things are consistent, but e2fs (at least
at one point) allowed you to read data from a file O_DIRECT which was
very different to what someone else read via the page-cache.


  --cw
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