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

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Message-ID: <457D8637.5070707@garzik.org>
Date:	Mon, 11 Dec 2006 11:24:23 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	"Darrick J. Wong" <djwong@...ibm.com>
CC:	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

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.

	Jeff



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