Bug 121566

Summary: [nfs] [request] [patch] ethernet iface should be brought up when booting from a mfs_root over nfs
Product: Base System Reporter: Robert Schulze <rs>
Component: kernAssignee: freebsd-rc (Nobody) <rc>
Status: Closed Overcome By Events    
Severity: Affects Only Me CC: jpaetzel
Priority: Normal    
Version: Unspecified   
Hardware: Any   
OS: Any   
Attachments:
Description Flags
rc.initdiskless.patch
none
rc.initdiskless.patch none

Description Robert Schulze 2008-03-10 15:30:00 UTC 
When booting a diskless client through a NFS-root, the code in
/usr/src/sys/nfsclient/nfs_vfsops.c fires up an interface with the data
from the previous DHCP-request, so it can mount the nfs-share.

When booting the same diskless client through a NFS-shared root-RAM-disk,
these settings do not become applied. The functionality of
/etc/rc.initdiskless is then obviously broken, because it can't get the
right templates to process and can't mount anything (see diskless_remount)
from a NFS-server.

Fix: 

Maybe the code which initializes the interface with the help of the
DHCP-Parameters should be issued by vfs_mountroot_try() before mounting
anything else.

Or one could copy the code to /dev/md/md.c and bring out a kernel-option
to en/disable this code, when using a MD_ROOT.
Comment 1 Mark Linimon freebsd_committer freebsd_triage 2008-03-10 23:25:39 UTC 
State Changed
From-To: open->suspended

Mark suspended awaiting patches.
Comment 2 Robert Schulze 2008-03-19 10:30:39 UTC 
Hi,

I found a workaround to simulate the behaviour of 
/sys/nfsclient/nfs_vfsops.c in rc.initdiskless.

The patch in "diff -Naur" format is attached.

with kind regards,
Robert Schulze
Comment 3 Mark Linimon freebsd_committer freebsd_triage 2008-03-19 20:59:06 UTC 
State Changed
From-To: suspended->open

Patch received.
Comment 4 Mark Linimon freebsd_committer freebsd_triage 2008-03-19 20:59:06 UTC 
Responsible Changed
From-To: freebsd-bugs->freebsd-rc
Comment 5 Robert Schulze 2008-03-25 10:54:38 UTC 
First sorry for the first "proof-of-concept"-like patch.

I now appended one that does some more checking and sets nfsroot 
according to variables from kenv to accomplish relative paths in 
diskless_remount.


with kind regards,

Robert Schulze