linux-kernel - Re: asynchronous calls an the lack of --wait-for-completion options (e.g. modprobe, losetup, cryptsetup)

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Date:	Tue, 23 Jun 2009 17:01:41 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	Alexander Holler <holler@...oftware.de>,
	Robert Hancock <hancockrwd@...il.com>,
	linux-kernel@...r.kernel.org, Greg Kroah-Hartmann <greg@...ah.com>
Subject: Re: asynchronous calls an the lack of --wait-for-completion options
  (e.g. modprobe, losetup, cryptsetup)

On Tue, 23 Jun 2009 13:35:07 +0200
Kay Sievers <kay.sievers@...y.org> wrote:

> On Mon, Jun 22, 2009 at 14:08, Alexander Holler<holler@...oftware.de> wrote:
> > On 20.06.2009 21:20, Kay Sievers wrote:
> 
> > Anyway, I still think, that the creation of the device-node is (seen from a
> > user-point) part of the module-initialization or part of the operation of
> > the userland-tool (like modprobe, losetup or cryptsetup). So in my point of
> > view, they should at least offer an option to wait until udev finished that
> > operation and should not rely on the user to call udevadm.
> 
> That would be all solved properly by "devtmpfs":
>    http://lkml.org/lkml/2009/4/30/182

which unsolves lots of other problems and has good reasons why people
object to it.

Sorting out waiting behaviour and fixing udev to do jobs once is a user
space problem and while it might benefit from some tiny bits of kernel
help re-implementing devfs (which we've been through before thank you) is
not the cure but replacing a minor ailment with a nasty disease
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