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

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Message-ID: <4B991B5F.6050302@zytor.com>
Date:	Thu, 11 Mar 2010 08:33:35 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Nikanth Karthikesan <knikanth@...e.de>
CC:	Theodore Tso <tytso@....edu>,
	Damian Lukowski <damian@....rwth-aachen.de>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	Jeff Garzik <jeff@...zik.org>, Matthew Wilcox <matthew@....cx>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	James Bottomley <James.Bottomley@...e.de>,
	Tejun Heo <tj@...nel.org>, lkml <linux-kernel@...r.kernel.org>,
	Daniel Taylor <Daniel.Taylor@....com>,
	Mark Lord <kernel@...savvy.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, jdelvare@...e.de
Subject: Re: ATA 4 KiB sector issues.

On 03/11/2010 05:57 AM, Nikanth Karthikesan wrote:
>
> I guess, what he meant was, to keep filesystem blocks aligned, even if the
> partition is not. Say if the partition is mis-aligned by 512-bytes, let the
> filesystem waste 4k-512bytes and keep it's blocks aligned. But it might be a
> case of over-engineering, possibly requiring disk format change.
>

That's basically what you end up having to do for FAT filesystems to be 
aligned.

	-hpa
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