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

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Message-ID: <45803AA0.8020203@us.ibm.com>
Date:	Wed, 13 Dec 2006 09:38:40 -0800
From:	"Darrick J. Wong" <djwong@...ibm.com>
To:	James Bottomley <James.Bottomley@...elEye.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

James Bottomley wrote:

> Er, if it's really a CD-ROM, doesn't it need a blacklist entry with
> BLIST_ROM then?  Regardless, MMC is the only standard that seems to be
> inconsistent in this regard.  Anything claiming to conform to SBC will
> need to be explicitly blacklisted if it claims SCSI-3 or higher and
> doesn't support REPORT LUNS.

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.

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.

--D
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