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

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Message-ID: <4B94AD9B.8020505@zytor.com>
Date:	Sun, 07 Mar 2010 23:56:11 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	James Bottomley <James.Bottomley@...e.de>
CC:	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, 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, jdelvare@...e.de, mkp@....net
Subject: Re: ATA 4 KiB sector issues.

On 03/07/2010 11:00 PM, James Bottomley wrote:
>
> The 2TB size for msdos partitions is a problem independent of the 4k
> sector issue.  Traditional 512 byte sector drives are now available in
> those sizes.  It looks like we're going to have to move to a new
> partitioning label to solve this.
>
> There's actually another barrier at 8 or 16TB, which is where a 4k
> logical sector filesystem tops out using 32 bit block offsets (it's 8TB
> if the fs hasn't been proof checked against sign extension problems).
>

The limit for the MS-DOS partition tables is 2^32 sectors.  The patch 
that Daniel posted was for a Linux kernel internal limit that set the 
limit to 2 TB.

	-hpa
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