linux-kernel - Re: O_DIRECT question

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Date:	Thu, 11 Jan 2007 17:23:51 +0100
From:	bert hubert <bert.hubert@...herlabs.nl>
To:	Linus Torvalds <torvalds@...l.org>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	Aubrey <aubreylee@...il.com>, Hua Zhong <hzhong@...il.com>,
	Hugh Dickins <hugh@...itas.com>, linux-kernel@...r.kernel.org,
	hch@...radead.org, kenneth.w.chen@...el.com, akpm@...l.org,
	mjt@....msk.ru
Subject: Re: O_DIRECT question

On Thu, Jan 11, 2007 at 07:50:26AM -0800, Linus Torvalds wrote:
> Yes. O_DIRECT is really fundamentally broken. There's just no way to fix 
> it sanely. Except by teaching people not to use it, and making the normal 

Does this mean that it will eat data today? Or that it is broken because it
requires heaps of work on the kernel side?

If it will eat data, when? What are the issues, cache coherency?

I understand what you say about O_DIRECT, but considering that it is seeing
use today, it would be good to know the extent of the practical problems.

Thanks.

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