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

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Message-ID: <20090203150816.GB20323@random.random>
Date:	Tue, 3 Feb 2009 16:08:16 +0100
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Greg KH <greg@...ah.com>,
	KOSAKI Motohiro <kosaki.motohiro@...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 Tue, Feb 03, 2009 at 01:38:11PM +0900, KAMEZAWA Hiroyuki wrote:
> From above, FOLL_WRITE can be dropped and PageGUP() will not be set ?

Yeah, this was an implementation trouble!! If cow triggered, PG_gup
wasn't getting set as it should have.

The only remaining bit is to check hugetlb pages...
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