linux-kernel - Re: [PATCH v2] libata: Simulate REPORT LUNS for ATAPI devices

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Message-ID: <457D8E69.5050906@garzik.org>
Date:	Mon, 11 Dec 2006 11:59:21 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	James Bottomley <James.Bottomley@...elEye.com>
CC:	"Darrick J. Wong" <djwong@...ibm.com>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Douglas Gilbert <dougg@...que.net>
Subject: Re: [PATCH v2] libata: Simulate REPORT LUNS for ATAPI devices

James Bottomley wrote:
> On Mon, 2006-12-11 at 11:24 -0500, Jeff Garzik wrote:
>> Darrick J. Wong wrote:
>>> The Quantum GoVault SATAPI removable disk device returns ATA_ERR in
>>> response to a REPORT LUNS packet.  If this happens to an ATAPI device
>>> that is attached to a SAS controller (this is the case with sas_ata),
>>> the device does not load because SCSI won't touch a "SCSI device"
>>> that won't report its LUNs.  Since most ATAPI devices don't support
>>> multiple LUNs anyway, we might as well fake a response like we do for
>>> ATA devices.
>>>
>>> Signed-off-by: Darrick J. Wong <djwong@...ibm.com>
>> I'm leaning towards applying this, perhaps with a module option that 
>> allows experimenters to revert back to the older behavior.
>>
>> Any chance you could be talked into tackling some of the SAT 
>> translation-related items Doug G mentioned?  I'm almost certain there 
>> are some info pages we should be returning, but are not, at the very least.
> 
> I thought we were closing in on agreeing that the SPC/MMC
> inconsistencies made this the correct candidate fix.

that works for me...

	Jeff



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