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

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Message-Id: <1166032646.2790.39.camel@mulgrave.il.steeleye.com>
Date:	Wed, 13 Dec 2006 11:57:25 -0600
From:	James Bottomley <James.Bottomley@...elEye.com>
To:	"Darrick J. Wong" <djwong@...ibm.com>
Cc:	Jeff Garzik <jeff@...zik.org>,
	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

On Wed, 2006-12-13 at 09:38 -0800, Darrick J. Wong wrote:
> Sorry, I should have clarified this earlier--the Quantum GoVault is a
> removable disk drive, not a CD-ROM.  The device is reminiscent of Zip
> disks, but the cartridge is a sealed unit and contains a 2.5" SATA disk
> inside; hence it's not a CD-ROM.  So the patch below won't work for me,
> because sdev->type == TYPE_DISK.

So it's a SATAPI device of type 0 ... that's fun ... but it still needs
a blacklist; it's governed by SBC which isn't ambiguous about the need
to support REPORT LUNS.  Now, if it supported RBC instead of SBC, that's
different; RBC also makes REPORT LUNS optional.  However, it is required
to indicate RBC support by being type 0xe.

> I wonder if the same sort of REPORT LUNS screw-up might apply to other
> ATAPI devices too, such as tape drives.  Since we've seen that
> manufacturers of CD-ROMs and removable disks don't implement it, it
> would not surprise me if the other ATAPI devices don't either.  But,
> that's speculation on my part.

James


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