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Message-ID: <20110829104631.GA6579@albatros>
Date: Mon, 29 Aug 2011 14:46:31 +0400
From: Vasiliy Kulikov <segoon@...nwall.com>
To: owl-dev@...ts.openwall.com
Subject: Re: initrd/udev in Owl?
Solar,
On Mon, Aug 29, 2011 at 01:42 +0400, Solar Designer wrote:
> Then this topic was brought up on our not-yet-public development list a
> few years ago. IIRC, at the time mjt suggested that udev was somewhat
> likely to be replaced with something else in a few years (which would be
> now). We could want to ask for his opinion now.
I don't think udev is replaced by anything in the near future.
> > I don't insist on udev as it also complicates modules loading rules (it
> > is not fully controlled by an admin anymore),
>
> Lacking full control by admin is really nasty/unacceptable - we'd need
> to provide some easy/supported way to regain such control.
udev is a configurable thing :)
There is a special rule for autoloading:
DRIVER!="?*", ENV{MODALIAS}=="?*", RUN+="/sbin/modprobe -b $env{MODALIAS}"
So, we can replace "modprobe" by a script, which maintains a list of
modules, which were requested by the kernel, but haven't been loaded
yet. Then sysadmin does:
$ cat /var/run/modules_requested
ath9k MODALIAS=pci:v0000168Cd00000027sv*sd*bc*sc*i* DEPENDENCIES=ath9k_hw.ko,ath9k_common.ko,ath9k.ko
...
and gets a list of not-yet-loaded modules with the dependencies.
Or there could be a list of modules, which are OK to autoload. Other
modules are not loaded and added to the modules_requested list.
BTW, the same list can be compiled from sysfs entries, without udev.
> > except (2).
>
> Yes, (2) is serious (I trust your description of it; I am not familiar
> with this myself).
I don't know whether it can be disabled. If yes, it is a way to go.
FWIW, as to hard drives - the stable naming for fstab can be obtained
two ways:
1) UUID for partitions.
2) symlinks created by udev and used in fstab instead /dev/sda1.
AFAIK, all modern distros do (1).
Thanks,
--
Vasiliy
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