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

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Message-ID: <20100310075334.GA26763@parisc-linux.org>
Date:	Wed, 10 Mar 2010 00:53:34 -0700
From:	Matthew Wilcox <matthew@....cx>
To:	"Martin K. Petersen" <martin.petersen@...cle.com>
Cc:	James Bottomley <James.Bottomley@...e.de>,
	Tejun Heo <tj@...nel.org>,
	"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,
	aschnell@...e.de, knikanth@...e.de, jdelvare@...e.de
Subject: Re: ATA 4 KiB sector issues.

On Mon, Mar 08, 2010 at 10:41:57AM -0500, Martin K. Petersen wrote:
> What I meant to say was that I know ATA supports 4 KB LBS and that
> nobody appears to care about it.

I sent patches to add support ... they were ignored.

Part of the problem is that ATA is heinously broken wrt non-512 byte
sector sizes.  You have to know which commands work in multiples of
the block size, and which commands work in multiples of 512-bytes.
There's no easy way to figure it out; you need a table.

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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