udev, loop and no devices [solved]

[panzerdampf]

Hy

Udev doesn't create the /dev/loop* devices for me.

- vanilla kernel (2.6.12.2)
- udev is installed (058)
- the modul `loop` is build and loaded, the kernel message "loop: loaded (max 8 devices)" appears
- udev is mounted, "udev on /dev type tmpfs (rw,nosuid)"
- I don't use device-tarballs : RC_DEVICE_TARBALL="no"
- RC_DEVICES is set to "udev".

If I try to loop-mount an image I get the message 'mount: could not find any device /dev/loop'.
That's right cause udev didn't created them. But why?

Things that irritate me :
- no running udev process : `ps ax | grep udev`
- why does RC_DEVICES exists in '/etc/conf.d/rc'? No one needs it : `grep -r RC_DEVICES /etc/*`

Any ideas?

[Darknight]

Have you tried compiling the module into the kernel?
Are you using the latest version of udev?
Maybe run etc-update to be sure you have updated etc files?

[garlicbread]

I've also been having trouble using 058 with device-mapper in a similar way
056 was fine as I used to use a rule that would look up the kernel device "dm-[0-9]*"
but for some reason 058 is not picking up on this
I've tried this both with 2.6.11 and 2.6.12 (as I thought 2.6.12 may have put some changes in place that may have affected this)

typically I'd use a custom rule of
KERNEL="dm-[0-9]*", PROGRAM="/etc/udev/scripts/dmmapper.sh %M %m evms/", NAME="mapper/%c{1}" SYMLINK="%c{2}"
I've rulled out the possibility of my script being at fault by fiddling around with the rule
from what I can determine "dm-[0-9]*" isn't being recognised
perhaps loop devices are being affected in the same way?
I'll try and test this when I get back tonight

EDIT
sorry nope Loop is working fine for me
for my other problem this seems to be because the rules in 50-udev.rules is overiding one in 10-local.rules
but this isn't right perhaps this is a bug?

[panzerdampf]

solved ... CONFIG_HOTPLUG was not build in

I think the name and description (the helptext) for this option should be changed.
Because, the current one is a bit confusing and does not tell about the whole truth.

[Mr Faber]

I have a similar problem but HOTPLUG is build in my kernel. I have some loop devices which get mounted on boot (e.g. encrypted tmp directory with loop-aes). It works for a long time but suddenly stops. I think it has something to do with the baselayout update or udev. I have an amd64 system. The funny thing is that it works on my x86 like before without problems.
The automount of loop-devices failes on boot with this error

[Mr Faber]

This post https://forums.gentoo.org/viewtopic-t-365612.html fixes my problem.

cu
Mr Faber