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Date: Sun, 28 Nov 2004 15:25:29 +0100 (CET)
Subject: Re: Is controlling DVD speeds via SET_STREAMING supported?
From: "Thomas Fritzsche" <tf@noto.de>
To: "Pasi Savolainen" <psavo@iki.fi>
Cc: linux-kernel@vger.kernel.org, axboe@suse.de
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Hi,

(please CC me because I'm not subscribed to the list)

>> What Kernel do you use?
>
> Linux tienel 2.6.10-rc2-mm1 #1 SMP Wed Nov 17 01:19:53 EET 2004 i686
> GNU/Linux

Maybe you can give a 2.4.27'er kernel a try.

>
> Actually now that I rebooted (for DVD flashing) and started back into
> linux, after running dvdspeed it also says:
> "scsi: unknown opcode 0xb6" (which is SET_STREAMING). Code for this is
> in drivers/block/scsi_ioctl.c, and if I read it right, it can't prevent
> root from executing that command.

I have the same impression after reading drivers/block/scsi_ioctl.c . I
think you will need root permission to send this command, RW-Permission
for the device file is not enough! Did you try this as root?

But I'm wondering that scsi_ioctl.c comes into play, because It's a
ATAPI-Device. Isn't it? Do you use the scsi emulation? If so please try
without.

>
> I modified your speed-1.0 to open device O_RDWR, didn't help.
> I modified it to also dump_sense after CMD_SEND_PACKET, it's just
> duplicate packet.

No this will definitively not solve this issue. I will try to check this
in the kernel, but because I'm not a kernel developer I will CC Jens
Axboe. Maybe he can help?

Kind Regards,
 Thomas Fritzsche

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