RE: not dynamically creating disk device nodes

[Kay Sievers <kay.sievers@vrfy.org>]

On Thu, 2007-04-12 at 18:02 -0400, Leisner, Martin wrote:
> That's what's happening.   When I crate the block device, there's no
> MAJOR/MINOR.
> 
> It seems to be making character devices fine (I modified some of the
> LDD3 examples to create a class,
> and it works fine).
> 
> For character devices, udev is opening the /class/<name>/dev file.
> For block devices, its NOT opening the /block/<partition name>/dev
> file.

We added stuff to the kernel, to make udev more reliable, and this
version of udev depends on a newer kernel. I suggest running an older
udev or a newer kernel.

> What's a good way to debug udevd?  Is there a way to run it without
> forks?

It will always fork, the daemon just handles the event queue.

> Or is there magic to debug a forking process (catch/follow-fork seems
> crude and only works
> once).

You can set the log level in /etc/udev/udev.conf or dynamically with
udevcontrol. And strace -f should work too, if the log does not provide
the needed information.

Kay


> > -----Original Message-----
> > From: linux-hotplug-devel-bounces@lists.sourceforge.net 
> > [mailto:linux-hotplug-devel-bounces@lists.sourceforge.net] On 
> > Behalf Of Kay Sievers
> > Sent: Wednesday, April 11, 2007 5:18 AM
> > To: Leisner, Martin
> > Cc: linux-hotplug-devel@lists.sourceforge.net
> > Subject: Re: not dynamically creating disk device nodes
> > 
> > On 4/9/07, Leisner, Martin <Martin.Leisner@xerox.com> wrote:
> > > I'm trying to use udev-092 on linux-2.6.10.
> > >
> > > Most things work.
> > >
> > > udevstart works fine.
> > >
> > > But when I start playing around with fdisk, the device nodes aren't
> > > getting erased/created
> > > for the hard drive (udevstart had no problem figuring this out)..
> > >
> > > udevd says:
> > >
> > > udevd[1163]: udev_event_run: seq 707 forked, pid [1168], 
> > 'add' 'block',
> > > 0 seconds old
> > > udevd-event[1168]: udev_db_get_device: no db file to read
> > > /dev/.udev/db/block@sda: No such file or directory
> > > udevd-event[1168]: udev_db_get_device: no db file to read
> > > /dev/.udev/db/block@sda: No such file or directory
> > > udevd-event[1168]: run_program: '/lib/udev/vol_id --export
> > > /dev/.tmp-0-0'
> > 
> > Udev does not seem to get the correct major/minor number for the
> > device, "0-0" looks wrong.
> > 
> > It is likely, that the udev daemon (10 months old) expects
> > MAJOR/MINOR-values in the event environment, but that kernel (2.5
> > years old) doesn't export it.
> > 
> > Udevstart reads that information from the "dev" file in sysfs, that's
> > why it may work just fine.
> > 
> > Kay
> > 
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