Patches to get Arla running on FreeBSD 8-CURRENT

[Robert Watson]

Dear Arla folk,

I've spent the evening getting Arla (checked out of anoncvs) up and running on 
FreeBSD 8-CURRENT, and have it at least minimally running (/afs mounted, some 
directory access, read a few files, etc), although arlad core dumped fairly 
quickly during use.  I've not yet attempted to debug that problem though.

I've attached a patch that does a few things:

First, it does a few minor Arla cleanups that appear to be necessary to build 
on FreeBSD 8: A few general Arla ifdef fixes, etc, such as testing 
defined(SunOS) before using the value, likewise on __NetBSD_Version__, 
OpenBSD, etc. Fix two build dependency issues I ran into regarding building 
arlalib before dependent tools and an include that broke (at least on 
FreeBSD).

Second, it adds new autoconf and ifdef parts to get Arla building on FreeBSD 
8, such as handling VFS changes that appeared in FreeBSD 7.x and 8.x, the 
priv(9) kernel privilege framework, some include problems I ran into with 
using /usr/src/sys before /usr/include/sys (which doesn't work for generated 
files such as vnode_if.h), and things along those lines.

Unfortunately, I'm not set up to easily build test on other platforms, and 
I've also not had a chance to try this on FreeBSD 7 -- my guess is some minor 
tweaks may be required with respect to both of those, but hopefully these are 
steps in the right direction and someone with a bit more Arla experience can 
sort out what I've done into things with keeping and things with fixing :-). 
I'll investigate the arlad crash tomorrow.

Patch also up at:

   http://www.watson.org/~robert/freebsd/20080216-arla.diff

Robert N M Watson
Computer Laboratory
University of Cambridge
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