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

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Date:	Wed, 22 Apr 2009 14:36:22 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>, Daniela Engert <dani@...t.de>,
	Boaz Harrosh <bharrosh@...asas.com>, 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

James Bottomley wrote:
> 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.

Like Alan's, if I understand him correctly, my PATA ATAPI CD changer 
simply presents a bunch of addressible LUNs.  I never loaded, nor seemed 
to need, ch.

I should boot a current libata and see how it behaves...

	Jeff



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