linux-kernel - Re: [PATCH] libata: rewrite SCSI host scheme to be one per ATA host

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Date:	Wed, 22 Apr 2009 15:37:02 +0000
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Daniela Engert <dani@...t.de>, Boaz Harrosh <bharrosh@...asas.com>,
	Jeff Garzik <jeff@...zik.org>, linux-ide@...r.kernel.org,
	linux-scsi@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Tejun Heo <htejun@...il.com>
Subject: Re: [PATCH] libata: rewrite SCSI host scheme to be one per ATA host

On Wed, 2009-04-22 at 16:18 +0100, Alan Cox wrote:
> > Don't forget, there are ATAPI devices (some Sony CD burners and old 
> > phase-changers come into mind) which *do* have multiple LUNs sitting 
> > beyond the PATA port. I don't know if libata supports such setups (my 
> > old OS/2 driver does) but one shouldn't hijack LUNs to emulate targets.
> 
> It's a long time ago since I tested it but my 5 CD changer was correctly
> supported by libata (or more accurately by sr...).

Well, sr supports the discovered CD/DVD; ch is the actual changer
manager.  Usually ch attaches to one LUN and sr attaches to another.

James


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