linux-kernel - Re: ioctl32: Unknown cmd

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Message-Id: <200710162150.37636.arnd@arndb.de>
Date:	Tue, 16 Oct 2007 21:50:35 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
Cc:	Jens Axboe <jens.axboe@...cle.com>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	Linux/PPC Development <linuxppc-dev@...abs.org>
Subject: Re: ioctl32: Unknown cmd

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?

	Arnd <><
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