[gentoo-user] Creating loop devices

[gentoo-user] Creating loop devices

[Alan McKinnon]

Hi all,

I seem to be missing my loop devices in /dev...
And I don't find any docs on the current method to do this. I imagine 
it's done with udev rules - anyone have working rules for this that 
they'd be willing to share?

alan
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Re: [gentoo-user] Creating loop devices

[F.J.Zhao]

Why not to use mknod?

mknod b /dev/loop0 7 0
mknod b /dev/loop1 7 1
mknod b /dev/loop2 7 2
...
chgrp disk /dev/loop*

2006/10/30, Alan McKinnon <alan@linuxholdings.co.za>:
> Hi all,
>
> I seem to be missing my loop devices in /dev...
> And I don't find any docs on the current method to do this. I imagine
> it's done with udev rules - anyone have working rules for this that
> they'd be willing to share?
>
> alan
> --
> gentoo-user@gentoo.org mailing list
>
>
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[gentoo-user] Re: Creating loop devices

[Harm Geerts]

On Monday 30 October 2006 13:54, Alan McKinnon wrote:
> Hi all,
>
> I seem to be missing my loop devices in /dev...
> And I don't find any docs on the current method to do this. I imagine
> it's done with udev rules - anyone have working rules for this that
> they'd be willing to share?
>
> alan

Do you have support for loop devices in your kernel?
udev has default rules for this in /etc/udev/rules.d/50-udev.rules

Symbol: BLK_DEV_LOOP [=y]
Prompt: Loopback device support
    Defined at drivers/block/Kconfig:261
    Location:
      -> Device Drivers
        -> Block devices 
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Re: [gentoo-user] Re: Creating loop devices

[Novensiles divi Flamen]

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On Monday 30 October 2006 21:57, Harm Geerts wrote:
> Do you have support for loop devices in your kernel?
> udev has default rules for this in /etc/udev/rules.d/50-udev.rules
>
> Symbol: BLK_DEV_LOOP [=y]
> Prompt: Loopback device support
>     Defined at drivers/block/Kconfig:261
>     Location:
>       -> Device Drivers
>         -> Block devices

Precisely. Build it in or build it as a module. Load the module and the 
devices u-magically appear.

- Noven
-- 
>-- Novensiles divi Flamen --<
>---- Miles Militis Fons ----<

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Re: [gentoo-user] Creating loop devices

[Alan McKinnon]

On Monday 30 October 2006 15:05, F.J.Zhao wrote:
> Why not to use mknod?
>
> mknod b /dev/loop0 7 0
> mknod b /dev/loop1 7 1
> mknod b /dev/loop2 7 2
> ...
> chgrp disk /dev/loop*

Because this is a udev only machine and I want udev to create the nodes. 
If I have to, I'll put the commands in a script to run at boot time, 
but I would rather have udev do it (as the devs intend). 
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Re: [gentoo-user] Re: SOLVED Creating loop devices

[Alan McKinnon]

On Monday 30 October 2006 16:57, Harm Geerts wrote:
> On Monday 30 October 2006 13:54, Alan McKinnon wrote:
> > Hi all,
> >
> > I seem to be missing my loop devices in /dev...
> > And I don't find any docs on the current method to do this. I
> > imagine it's done with udev rules - anyone have working rules for
> > this that they'd be willing to share?
> >
> > alan
>
> Do you have support for loop devices in your kernel?
> udev has default rules for this in /etc/udev/rules.d/50-udev.rules

Problem solved! With the last kernel upgrade I must have changed my loop 
devices from compiled in to modular, and there's no "loop" entry 
in /etc/modules.autoload.d/kernel-2.6. If I "modprobe loop" everything 
works like it's supposed to.

Earlier I had also run "grep -i loop /etc/udev/*" and got no results, 
which sent me into a tailspin - note the spectacular omission of the -r 
parameter.

<sigh> it's been a very long day :-) 

Thanks for the pointers

alan
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Re: [gentoo-user] Re: Creating loop devices

[Alan McKinnon]

On Monday 30 October 2006 17:49, Novensiles divi Flamen wrote:
> On Monday 30 October 2006 21:57, Harm Geerts wrote:
> > Do you have support for loop devices in your kernel?
> > udev has default rules for this in /etc/udev/rules.d/50-udev.rules
> >
> > Symbol: BLK_DEV_LOOP [=y]
> > Prompt: Loopback device support
> >     Defined at drivers/block/Kconfig:261
> >     Location:
> >       -> Device Drivers
> >         -> Block devices

Thanks for the reply, you were on the right track as I mentioned in my 
other mail on this thread

alan
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Re: [gentoo-user] Re: SOLVED Creating loop devices

[Uwe Thiem]

On 30 October 2006 17:59, Alan McKinnon wrote:
> On Monday 30 October 2006 16:57, Harm Geerts wrote:
> > On Monday 30 October 2006 13:54, Alan McKinnon wrote:
> > > Hi all,
> > >
> > > I seem to be missing my loop devices in /dev...
> > > And I don't find any docs on the current method to do this. I
> > > imagine it's done with udev rules - anyone have working rules for
> > > this that they'd be willing to share?
> > >
> > > alan
> >
> > Do you have support for loop devices in your kernel?
> > udev has default rules for this in /etc/udev/rules.d/50-udev.rules
>
> Problem solved! With the last kernel upgrade I must have changed my loop
> devices from compiled in to modular, and there's no "loop" entry
> in /etc/modules.autoload.d/kernel-2.6. If I "modprobe loop" everything
> works like it's supposed to.

Hm... My loop devices are compiled as modules, I don't have any loop entry 
in /etc/modules.autoload.d/kernel-2.6 - but my loop devices are all there 
under /dev.

Magic? White magic, black magic? Actually, this white=good and black=bad stuff 
is a bit of a no-no here in Africa. ;-)

Uwe

-- 
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http://www.SysEx.com.na
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Re: [gentoo-user] Re: SOLVED Creating loop devices

[Alan McKinnon]

On Monday 30 October 2006 20:28, Uwe Thiem wrote:
> > Problem solved! With the last kernel upgrade I must have changed my
> > loop devices from compiled in to modular, and there's no "loop"
> > entry in /etc/modules.autoload.d/kernel-2.6. If I "modprobe loop"
> > everything works like it's supposed to.
>
> Hm... My loop devices are compiled as modules, I don't have any loop
> entry in /etc/modules.autoload.d/kernel-2.6 - but my loop devices are
> all there under /dev.

Hmmm, interesting. I've updated my /etc/modules.autoload.d/kernel-2.6 
and now it all just works correctly, but wasn't before. 

Something with a kernel version perhaps? I'm using 2.6.18-suspend2

alan
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