linux-kernel - Re: [PATCH] compat_ioctl: introduce generic_compat

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Date:	Sat, 20 Oct 2007 17:11:19 +0100
From:	Christoph Hellwig <hch@...radead.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Al Viro <viro@....linux.org.uk>,
	Philip Langdale <philipl@...rt.org>,
	Jiri Kosina <jkosina@...e.cz>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] compat_ioctl: introduce generic_compat_ioctl helper

On Sat, Oct 20, 2007 at 05:50:57PM +0200, Arnd Bergmann wrote:
> Many drivers use only compatible ioctl numbers. In order to
> avoid having to write a special compat_ioctl handler for each
> of them or listing every ioctl number in fs/compat_ioctl.c,
> let's introduce a generic handler that simply calls the
> driver specific f_op->unlocked_ioctl() or f_op->ioctl() handler.

At least for the unlocked_ioctl case this is not nessecary because
the driver an simply set both the unlocked_ioctl and compat_ioctl
handlers to the same function.  For the drivers not using unlocked_ioctl
yet a function like this makes sense in theory, but I'd prefer to
just switch them to ->unlocked_ioctl.

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