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

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Message-ID: <9a8748490701120254x6a7dd93aw9dd75994af661f5e@mail.gmail.com>
Date:	Fri, 12 Jan 2007 11:54:33 +0100
From:	"Jesper Juhl" <jesper.juhl@...il.com>
To:	"Jan Engelhardt" <jengelh@...ux01.gwdg.de>
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 12/01/07, Jan Engelhardt <jengelh@...ux01.gwdg.de> wrote:
>
> 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
>

There is no good way.  You simply should NOT do it.

-- 
Jesper Juhl <jesper.juhl@...il.com>
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