linux-kernel - Re: [PATCH] usb gadget: remove size limitation for storage cdrom

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Date:	Mon, 9 Mar 2015 10:39:42 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Dave Young <dyoung@...hat.com>
cc:	balbi@...com, <gregkh@...uxfoundation.org>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb gadget: remove size limitation for storage cdrom

On Mon, 9 Mar 2015, Alan Stern wrote:

> > They are both iso9660 images, aren't they? So from data image point
> > of view there's no difference, it is not worth to create another mode
> > for dvd data.
> 
> There's more to emulation than just the image.  We have to emulate the 
> hardware's response to all the applicable commands.  CD players have a 
> different command set from DVD players (or at least, different from DVD 
> players when a DVD is inserted).  For example, see the definition in 
> the MSF format for READ TOC command.

Or to put it another way: The change you want to make would break the
store_cdrom_address() routine in storage_common.c.

Alan Stern

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