[PATCH] include biosdevname calls in dracut

[PATCH] include biosdevname calls in dracut

[Matt Domsch]

For your consideration.  This allows biosdevname to be called from
network-using functions in dracut.  biosdevname is included in Fedora
15, and there are tickets open to include it in other distros.

Signed-off-by: Matt Domsch <Matt_Domsch-8PEkshWhKlo@public.gmane.org>

Thanks,
Matt


From ef6a283f685571c730063a666830e2f02d8e9244 Mon Sep 17 00:00:00 2001
From: Matt Domsch <Matt_Domsch-8PEkshWhKlo@public.gmane.org>
Date: Fri, 3 Dec 2010 23:41:01 -0600
Subject: [PATCH] add biosdevname calls to network subpackage

---
 dracut.spec                    |    1 +
 modules.d/95udev-rules/install |    5 +++--
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/dracut.spec b/dracut.spec
index f3b92d7..f3fb3dd 100644
--- a/dracut.spec
+++ b/dracut.spec
@@ -113,6 +113,7 @@ Requires: bridge-utils
 Requires: iscsi-initiator-utils
 Requires: nfs-utils 
 Requires: dhclient
+Requires: biosdevname
 %endif
 
 %if 0%{?suse_version}
diff --git a/modules.d/95udev-rules/install b/modules.d/95udev-rules/install
index ee32b56..f42f68a 100755
--- a/modules.d/95udev-rules/install
+++ b/modules.d/95udev-rules/install
@@ -6,10 +6,11 @@
 # ultimately, /lib/initramfs/rules.d or somesuch which includes links/copies
 # of the rules we want so that we just copy those in would be best
 dracut_install udevd udevadm /etc/udev/udev.conf /etc/group
-dracut_install basename
+dracut_install basename biosdevname
 inst_rules 50-udev-default.rules 60-persistent-storage.rules \
     61-persistent-storage-edd.rules 80-drivers.rules 95-udev-late.rules \
-    60-pcmcia.rules 
+    60-pcmcia.rules \
+    71-netdevice.rules
 #Some debian udev rules are named differently
 inst_rules 50-udev.rules 95-late.rules
 
-- 
1.7.3.2

Re: [PATCH] include biosdevname calls in dracut

[Matt Domsch]

On Sun, Dec 05, 2010 at 06:52:29PM -0600, Matt Domsch wrote:
> For your consideration.  This allows biosdevname to be called from
> network-using functions in dracut.  biosdevname is included in Fedora
> 15, and there are tickets open to include it in other distros.

Any thoughts on this patch?

Thanks,
Matt

-- 
Matt Domsch
Technology Strategist
Dell | Office of the CTO

Re: [PATCH] include biosdevname calls in dracut

[Amadeusz Żołnowski]

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Excerpts from Matt Domsch's message of Tue Dec 14 20:58:07 +0100 2010:
> On Sun, Dec 05, 2010 at 06:52:29PM -0600, Matt Domsch wrote:
> > For your consideration.  This allows biosdevname to be called from
> > network-using functions in dracut.  biosdevname is included in
> > Fedora 15, and there are tickets open to include it in other
> > distros.
> 
> Any thoughts on this patch?

I think that better would be to include your patch with first its usage.
Having additional dependencies without a real use brings mess.  But it's
just my opinion and I'm not in charge. :-)


Cheers,
-- 
Amadeusz Żołnowski

PGP key fpr: C700 CEDE 0C18 212E 49DA  4653 F013 4531 E1DB FAB5

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Re: [PATCH] include biosdevname calls in dracut

[Matt Domsch]

On Tue, Dec 21, 2010 at 05:16:17PM +0100, Amadeusz ??o??nowski wrote:
> Excerpts from Matt Domsch's message of Tue Dec 14 20:58:07 +0100 2010:
> > On Sun, Dec 05, 2010 at 06:52:29PM -0600, Matt Domsch wrote:
> > > For your consideration.  This allows biosdevname to be called from
> > > network-using functions in dracut.  biosdevname is included in
> > > Fedora 15, and there are tickets open to include it in other
> > > distros.
> > 
> > Any thoughts on this patch?
> 
> I think that better would be to include your patch with first its usage.
> Having additional dependencies without a real use brings mess.  But it's
> just my opinion and I'm not in charge. :-)

The use case is simple - any network-using functions that are started
using dracut (NFS root, iSCSI root, FCoE root) will then use the
biosdevname names for devices, rather than the non-deterministic
kernel names ethX.

The three instances where <interface> can be passed are:

ip=<interface>:{dhcp|on|any|dhcp6|auto6}
bootdev=<interface>
netroot=fcoe:<interface|MAC>:<dcb|nodcb>

plus the forceable rewrite rule:
ifname=<interface>:<MAC>
which only works when you already know the MAC address of the target device.

The biosdevname method behaves similarly to the ifname= method, except
you get device names from BIOS, without needing to know the MAC
address of the target device(s).  

With this patch, you no longer need to use bootdev=eth0  and later
have udev rename eth0 to be em1, which leads to different devices names
for configuration at different times (dracut and post-dracut).  Both
dracut and post-dracut use the same device names.

Thanks,
Matt

-- 
Matt Domsch
Technology Strategist
Dell | Office of the CTO