linux-kernel - Re: ATA support for 4k sector size

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Date:	Wed, 25 Feb 2009 14:53:43 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Matthew Wilcox <matthew@....cx>
CC:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: ATA support for 4k sector size

Matthew Wilcox wrote:
> The two patches following this add support for drives which have sector
> sizes other than 512 bytes.  I haven't been able to test this as I don't
> have the hardware.
> 
> Individual host drivers will have to be updated to support sizes other
> than 512 bytes.
> 
> Support for logical sector sizes that differ from physical sector sizes
> depends on the READ CAPACITY 16 patch I posted in December that isn't in
> scsi-misc yet.
> 
> The approach I've taken to generating the tables of which commands need
> a 512-byte transfer size and which use the drive's sector size command is
> 'innovative'.  Review is encouraged ;-)

What sector size do we report to user space for this?  I'm asking 
because logical sector size is visible in most partition formats.

	-hpa
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