linux-kernel - Re: [PATCH 3/6] fms: Add TOC/PMA/ATIP DVD-ROM capabilities

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Message-ID: <20210627142952.GE624763@rowland.harvard.edu>
Date:   Sun, 27 Jun 2021 10:29:52 -0400
From:   Alan Stern <stern@...land.harvard.edu>
To:     Igor Kononenko <i.kononenko@...ro.com>
Cc:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jens Axboe <axboe@...nel.dk>, openbmc@...ts.ozlabs.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/6] fms: Add TOC/PMA/ATIP DVD-ROM capabilities

On Sun, Jun 27, 2021 at 12:18:16AM +0300, Igor Kononenko wrote:
> The DVD-ROM required the SCSI 6.25 READ TOC/PMA/ATIP Command formats:
>  * Response Format 0000b: Formatted TOC
>  * Response Format 0001b: Multi-session Information
> (MMC-6 Specification).
> 
> This patch adds an implementation of that described above formats.

I will sum up the last four patches of this series by saying that they
add features for emulating DVD-ROM and BD devices.  Doing so increases
the size of the f_mass_storage driver by a considerable amount and
also adds a large amount of new material to Jens Axboe's
include/uapi/linux/cdrom.h.

Is any of this really needed?  What usage scenarios require
f_mass_storage to emulate a DVD-ROM that couldn't use f_tcm instead?

Alan Stern