Date: Mon, 13 Feb 2006 17:49:11 +0100
From: Olivier Galibert <galibert@pobox.com>
To: Greg KH <greg@kroah.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: CD writing in future Linux (stirring up a hornets' nest)
Message-ID: <20060213164911.GB75835@dspnet.fr.eu.org>
Mail-Followup-To: Olivier Galibert <galibert@pobox.com>,
	Greg KH <greg@kroah.com>, linux-kernel@vger.kernel.org
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On Sun, Feb 12, 2006 at 10:24:12PM -0800, Greg KH wrote:
> On Sun, Feb 12, 2006 at 10:14:06PM +0100, Olivier Galibert wrote:
> > On Sun, Feb 12, 2006 at 08:46:33AM -0800, Greg KH wrote:
> > > On Sun, Feb 12, 2006 at 01:04:51PM +0100, Olivier Galibert wrote:
> > > > You need to call udevinfo for that, or parse /dev/.udev/*.  Do you
> > > > think it would be possible to have hotplug/udev/whatever exists in the
> > > > future to give that information back in the kernel and have it appear
> > > > in sysfs?
> > > 
> > > No.  Why would it when it is very simple to query udevinfo for that?
> > 
> > In order not to depend on a userland package for the kernel service of
> > device enumeration?  It's udevinfo now, what will it be in two years?
> 
> WTF?  You are depending on that same program to create your device
> nodes.  If you don't want to use that program to do it, then use
> something else, or use a static device tree, which works like always.

Funnily enough, my, say, mp3 usb key sync system would like to run as
non-root and does not want to know or care about what program creates
the device nodes.  Too bad this otherwise beautiful and useful sysfs
is crippled by design.


> sysfs exports everything that userspace needs to know, if it wants to
> create a device node to talk to that specific device.  udev used it to
> create your /dev tree, while other programs use it to create temporary
> device nodes to do other things to your devices.  Either way, the kernel
> doesn't know, or care what you call those device nodes.

You mean root is mandatory to talk with devices, whatever they are?

  OG.
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