linux-kernel - Re: ATA 4 KiB sector issues.

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Message-ID: <4B9FA59E.1000402@kernel.org>
Date:	Wed, 17 Mar 2010 00:37:02 +0900
From:	Tejun Heo <tj@...nel.org>
To:	James Bottomley <James.Bottomley@...e.de>
CC:	Denys Vlasenko <vda.linux@...glemail.com>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Daniel Taylor <Daniel.Taylor@....com>,
	Jeff Garzik <jeff@...zik.org>, Mark Lord <kernel@...savvy.com>,
	tytso@....edu, "H. Peter Anvin" <hpa@...or.com>,
	hirofumi@...l.parknet.co.jp,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, irtiger@...il.com,
	Matthew Wilcox <matthew@....cx>, aschnell@...e.de,
	knikanth@...e.de
Subject: Re: ATA 4 KiB sector issues.

Hello,

On 03/17/2010 12:23 AM, James Bottomley wrote:
>> So, using custom geometry doesn't help compatibility at all.
> 
> Our partitioning tool still obey the integral cylinder rule ... we can
> argue about whether they should, but what we need is a strategy for
> fixing what is rather than what should be.

The updated ones don't anymore.  They just align to 1MiB + whatever
the drive requests for offset (the offset-by-one thing).  They will
basically behave the same as windows vista/7 ones, so it's already
fixed.  What we can argue is whether adding CHS tricks on top to make
those larger alignments somewhat meaningful w/ CHS interpretation too,
which I'm objecting on the ground that it doesn't help compatibility
at all.

Thanks.

-- 
tejun
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