linux-kernel - Re: How can I create or read/write a file in linux device driver?

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Message-ID: <Pine.LNX.4.61.0701121139010.17236@yvahk01.tjqt.qr>
Date:	Fri, 12 Jan 2007 11:43:02 +0100 (MET)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	Jesper Juhl <jesper.juhl@...il.com>
cc:	congwen <congwen@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: How can I create or read/write a file in linux device driver?


On Jan 12 2007 11:27, Jesper Juhl wrote:
> On 12/01/07, congwen <congwen@...il.com> wrote:
>> Hello everyone, I want to create and read/write a file in Linux kernel or
>> device driver,
>
> Don't read/write user space files from kernel space.
>
> Please search the archives, this get asked a lot and it has been
> explained a million times why it's a bad idea.
> You can also read http://www.linuxjournal.com/article/8110

The article does it the bad way. IMHO filp_open() and 
vfs_read/vfs_write() are much less problematic wrt. to userspace.
FWIW see 
ftp://ftp-1.gwdg.de/pub/linux/misc/suser-jengelh/kernel/quad_dsp-1.5.1.tar.bz2


	-`J'
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