linux-kernel - Re: open(2) says O_DIRECT works on 512 byte boundries?

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Date:	Mon, 2 Feb 2009 19:50:12 -0800
From:	Greg KH <greg@...ah.com>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	mtk.manpages@...il.com, linux-man@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: open(2) says O_DIRECT works on 512 byte boundries?

On Mon, Feb 02, 2009 at 11:08:56PM +0100, Andrea Arcangeli wrote:
> Hi Greg!
> 
> > Thanks for the pointers, I'll go read the thread and follow up there.
> 
> If you also run into this final fix is attached below. Porting to
> mainline is a bit hard because of gup-fast... Perhaps we can use mmu
> notifiers to fix gup-fast... need to think more about it then I'll
> post something.
> 
> Please help testing the below on pre-gup-fast kernels, thanks!

Thanks a lot for the patch, I'll try this out tomorrow.

greg k-h
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