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Date: Wed, 10 Mar 2010 00:53:34 -0700
From: Matthew Wilcox <matthew@wil.cx>
To: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: James Bottomley <James.Bottomley@suse.de>, Tejun Heo <tj@kernel.org>,
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       Andrew Morton <akpm@linux-foundation.org>,
       Alan Cox <alan@lxorguk.ukuu.org.uk>, irtiger@gmail.com,
       aschnell@suse.de, knikanth@suse.de, jdelvare@suse.de
Subject: Re: ATA 4 KiB sector issues.
Message-ID: <20100310075334.GA26763@parisc-linux.org>
References: <4B947393.2050002@kernel.org> <1268031640.4389.11.camel@mulgrave.site> <yq1vdd6bzgz.fsf@sermon.lab.mkp.net> <yq1mxyibz7o.fsf@sermon.lab.mkp.net> <yq1iq96bz22.fsf@sermon.lab.mkp.net>
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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."