linux-kernel - Re: [PATCH 8/8] libata: implement on-demand HPA unlocking

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Message-ID: <4BEEF475.5000501@garzik.org>
Date:	Sat, 15 May 2010 15:22:29 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Tejun Heo <tj@...nel.org>
CC:	linux-ide@...r.kernel.org, jens.axboe@...cle.com,
	linux-scsi@...r.kernel.org, James.Bottomley@...e.de,
	linux-kernel@...r.kernel.org, ben@...adent.org.uk,
	davem@...emloft.net, bzolnier@...il.com
Subject: Re: [PATCH 8/8] libata: implement on-demand HPA unlocking

On 05/15/2010 02:09 PM, Tejun Heo wrote:
> Implement ata_scsi_unlock_native_capacity() which will be called
> through SCSI layer when block layer notices that partitions on a
> device extend beyond the end of the device.  It requests EH to unlock
> HPA, waits for completion and returns the current device capacity.
>
> This allows libata to unlock HPA on demand instead of having to decide
> whether to unlock upfront.  Unlocking on demand is safer than
> unlocking by upfront because some BIOSes write private data to the
> area beyond HPA limit.  This was suggested by Ben Hutchings.
>
> Signed-off-by: Tejun Heo<tj@...nel.org>
> Suggested-by: Ben Hutchings<ben@...adent.org.uk>

Acked-by: Jeff Garzik <jgarzik@...hat.com>


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