linux-kernel - Re: tools support for non-512 byte sector sizes

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Message-ID: <20080729182611.GB24924@parisc-linux.org>
Date:	Tue, 29 Jul 2008 12:26:11 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	Ric Wheeler <rwheeler@...hat.com>
Cc:	linux-scsi@...r.kernel.org, linux-ide@...r.kernel.org,
	Jim Meyering <jim@...ering.net>, linux-kernel@...r.kernel.org,
	Martin Petersen <mkp@....net>, Jeff Garzik <jeff@...zik.org>,
	Matt Domsch <Matt_Domsch@...l.com>
Subject: Re: tools support for non-512 byte sector sizes

On Tue, Jul 29, 2008 at 01:24:31PM -0400, Ric Wheeler wrote:
> Jim pinged me about the use case for having our tool chain (parted 
> specifically) support devices with non-512 bytes sectors.

Matt Domsch spoke with me about this at OLS.  I took that opportunity,
and I'll take this one, to pimp my ata-ram driver which allows you to
alter the sector sizse to whatever you want:

http://git.kernel.org/?p=linux/kernel/git/willy/misc.git;a=shortlog;h=ata-ram

I'll admit to having not tested it with anything other than 512, but it
ought to support 4096 byte sectors just fine.  I haven't looked at what
would be required to support 520-byte sectors.

Jeff, any interest in merging ata-ram soon?  I've got some users inside
Intel, and Zab persuaded me to add the multiple port support last night,
so it's not just useful for me.  I think it's also a nice template to
have around to show how to write a minimal libata driver.

> Off the top of my head, the following is the list of existing or soon to 
> appear devices that could use this (taken from our thread last year, at
> http://kerneltrap.org/mailarchive/linux-fsdevel/2007/3/11/317183):
> 
>    (1) R/W optical drives
>    (2) S390 dasd devices have a 4096 byte sector
>    (3) new 4096 byte disks (which intend to export a virtual 512 byte 
> sector)
> 
> Anything else pop into mind? Any idea if SSD or FLASH devices have 
> thoughts to use a non-512 byte sector size? What tools are most critical 
> to support?
> 
> Thanks!
> 
> Ric
> 
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