linux-kernel - Re: ioctl32: Unknown cmd

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Date:	Wed, 17 Oct 2007 08:38:34 +0200 (CEST)
From:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
To:	Arnd Bergmann <arnd@...db.de>
cc:	Linux/PPC Development <linuxppc-dev@...abs.org>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: ioctl32: Unknown cmd

On Tue, 16 Oct 2007, Arnd Bergmann wrote:
> On Tuesday 16 October 2007, Geert Uytterhoeven wrote:
> > The recent (post 2.6.23) changes to compat_ioctl made the reporting of
> > unsupported ioctls more verbose. E.g. on the PS3 I get:
> > 
> > | ioctl32(cdrom_id:608): Unknown cmd fd(3) cmd(00005331){t:'S';sz:0} arg(00000000) on /dev/.tmp-11-0
> > | ioctl32(hdparm:1427): Unknown cmd fd(3) cmd(0000031f){t:03;sz:0} arg(00000000) on /dev/ps3da
> > | ioctl32(hdparm:1427): Unknown cmd fd(3) cmd(0000031f){t:03;sz:0} arg(00000000) on /dev/ps3da
> > 
> > The first one is triggered by the detection of the CD/DVD/BD-ROM driver,
> > The others are triggered by me running hdparm.
> > 
> > Was this intentional?
> 
> No, it was certainly not intentional, and I can't figure out why it happens.
> The ioctl numbers from your example are HDIO_DRIVE_CMD and CDROM_GET_CAPABILITY,
> both of which should be handled through compat_blkdev_driver_ioctl by calling
> the native ioctl method of the driver, and return -ENOTTY otherwise.
> 
> The one point where it is expected to have changed now is when you try
> to do these ioctls on something that is not a block device. Are you sure that
> the files you tried them on were created correctly?

/dev/ps3da is definitely a block device.

With kind regards,
 
Geert Uytterhoeven
Software Architect

Sony Network and Software Technology Center Europe
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