linux-kernel - Re: [PATCH 1/2]: Fix BUG in cancel_dirty

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Message-ID: <45B885CE.4030206@yahoo.com.au>
Date:	Thu, 25 Jan 2007 21:26:22 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	David Chinner <dgc@....com>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, xfs@....sgi.com, akpm@...l.org
Subject: Re: [PATCH 1/2]: Fix BUG in cancel_dirty_pages on XFS

David Chinner wrote:

> Only if we leave the page in the page cache. If we toss the page,
> the time it takes to do the I/O for the page fault is enough for
> the direct I/o to complete. Sure it's not an absolute guarantee,
> but if you want an absolute guarantee:

So I guess you *could* relax it in theory... Anyway, don't take
my pestering as advocacy for wanting XFS to do something more
clever in such a corner case. I think you're quite right to be
conservative and share codepaths between direct IO read and
write.

-- 
SUSE Labs, Novell Inc.
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