Re: devfs vs udev, thoughts from a devfs user

[Ian Kent]

On Tue, 10 Feb 2004, Greg KH wrote:

> On Tue, Feb 10, 2004 at 03:34:18AM -0800, Mike Bell wrote:
> > I've been reading a lot lately about udev and how it's both very
> > different to and much better than devfs, and with _most_ of the reasons
> > given, I can't see how either is the case. I'd like to lay out why I
> > think that is.
> 
> One final comment:  Can you implement a persistent device naming scheme
> using devfs today?  If so, please show me how you would:
> 	- always name a USB printer the same /dev name no matter when it
> 	  is discovered by the USB core (before or after any other USB
> 	  printer.)
> 	- always name your SCSI disk the same /dev name no matter where
> 	  in the scsi probe sequence it is (yank it out and plug it into
> 	  another place in your scsi rack.)
> 
> This is the main problem that udev solves.  The fact that it also gives
> you a dynamic /dev is just extra goodness.

In his final comment, inocently, he makes the big point.

This a huge deal.

Ian

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