linux-kernel - Re: [PATCH] Remove broken by design and by implementation devtmpfs maintenance disaster

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Message-ID: <m1d45oxsrk.fsf@fess.ebiederm.org>
Date:	Fri, 18 Sep 2009 06:54:39 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Greg Kroah-Hartmann <greg@...ah.com>
Subject: Re: [PATCH] Remove broken by design and by implementation devtmpfs  maintenance disaster


> I don't understand. Udev applies the final policy including
> permissions/ownership, just as before. There is no differrence. It's
> just that you can bring up a box without complex userspace to
> bootstrap /dev. And that's a big win on its own.

udev is too complex to use?  That sounds like a userspace bug.

This I guess is where I am baffled.   The argument for devtmpfs
always seem to boil down to: udev sucks let's write some kernel
code instead.

I have been trying to ask for a long time why we can't just fix
udev to not suck. 

>  And things like
> "modprobe loop; losetup /dev/loop0" will just work, which it doesn't
> with todays async udev. Again, please make yourself familiar how
> things work, and what the problems are.

I guess I don't understand why 
modprobe loop; losetup /dev/loop0 is an interesting case.
When you can just as easily do:
modprobe loop; udevadm settle; losetup /dev/loop0.

Eric
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