CVS log for src/sys/nfs/nfs_boot.c

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Keyword substitution: kv
Default branch: MAIN

sys: Drop redundant NULL check before m_freem(9)

m_freem(9) safely has accepted NULL argument at least since 4.2BSD:
https://www.tuhs.org/cgi-bin/utree.pl?file=4.2BSD/usr/src/sys/sys/uipc_mbuf.c

Compile-tested on amd64/ALL.

Suggested by knakahara@

Remove routes on an address removal if the routes referencing to the address.  Implemented by ozaki-r@n.o.

A route that has a gateway is on a connected route can be invalid if the
connected route is deleted, i.e., an associated address is removed.
Traditionally NetBSD doesn't sweep such a route on the address removal.  Sending
packets over the route fails with "No route to host".  Also the route holds an
orphan ifaddr as rt_ifa that is destructed say by in_purgeaddr.

If the same address is assgined again in such a state, there can be two
different ifaddr objects with the same address.  Until recently it's not a
big problem because we can send packets anyway.  However after MP-ification
of the network stack, we can't send packets because we strictly check if rt_ifa
(i.e., the (old) ifaddr) is valid.

This change automatically removes such routes on a removal of an associated
address to avoid keeping inconsistent routes.

Sync with HEAD

Default NFS mounts to using TCP transport instead of UDP.
PR kern/53166

update from HEAD

Sync with HEAD.  (Note that most of these changes are simply $NetBSD$
tag issues.)

Sync with HEAD

Don't use rt_walktree to delete routes

Some functions use rt_walktree to scan the routing table and delete
matched routes. However, we shouldn't use rt_walktree to delete
routes because rt_walktree is recursive to the routing table (radix
tree) and isn't friendly to MP-ification. rt_walktree allows a caller
to pass a callback function to delete an matched entry. The callback
function is called from an API of the radix tree (rn_walktree) but
also calls an API of the radix tree to delete an entry.

This change adds a new API of the radix tree, rn_search_matched,
which returns a matched entry that is selected by a callback
function passed by a caller and the caller itself deletes the
entry. By using the API, we can avoid the recursive form.

KNF. Remove extra spaces. No functional change.

Sync with HEAD

change nfs_boot_sendrecv to take sockaddr_in * instead of mbuf *

fixes m_serv (single mbuf leak) leak in kern/subr_tftproot.c

change sosend() to accept sockaddr * instead of mbuf * for nam.

bump to 7.99.16

Pull up following revision(s) (requested by hikaru in ticket #1287):
	sys/kern/subr_tftproot.c: revision 1.14 via patch
	sys/nfs/nfsdiskless.h: revision 1.31
	sys/nfs/nfs_boot.c: revision 1.82
	sys/nfs/krpc_subr.c: revision 1.39
	sys/nfs/nfs_bootdhcp.c: revision 1.53
m_pullup() is called in rcvproc callback functions,
so nfs_boot_sendrecv() should keep track of the head of mbuf chain.
fixes kern/48746

Sync with HEAD

Pull up following revision(s) (requested by hikaru in ticket #656):
	sys/kern/subr_tftproot.c: revision 1.14
	sys/nfs/krpc_subr.c: revision 1.39
	sys/nfs/nfs_boot.c: revision 1.82
	sys/nfs/nfs_bootdhcp.c: revision 1.53
	sys/nfs/nfsdiskless.h: revision 1.31
m_pullup() is called in rcvproc callback functions,
so nfs_boot_sendrecv() should keep track of the head of mbuf chain.
fixes kern/48746

* change pr_bind to accept struct sockaddr * instead of struct mbuf *
* update protocol bind implementations to use/expect sockaddr *
  instead of mbuf *
* introduce sockaddr_big struct for storage of addr data passed via
  sys_bind; sockaddr_big is of sufficient size and alignment to
  accommodate all addr data sizes received.
* modify sys_bind to allocate sockaddr_big instead of using an mbuf.
* bump kernel version to 7.99.9 for change to pr_bind() parameter type.

Patch posted to tech-net@
  http://mail-index.netbsd.org/tech-net/2015/03/15/msg005004.html

The choice to use a new structure sockaddr_big has been retained since
changing sockaddr_storage size would lead to unnecessary ABI change. The
use of the new structure does not preclude future work that increases
the size of sockaddr_storage and at that time sockaddr_big may be
trivially replaced.

Tested by mrg@ and myself, discussed with rmind@, posted to tech-net@

m_pullup() is called in rcvproc callback functions,
so nfs_boot_sendrecv() should keep track of the head of mbuf chain.
fixes kern/48746

Rebase to HEAD as of a few days ago.

sync with head.

for a reference, the tree before this commit was tagged
as yamt-pagecache-tag8.

this commit was splitted into small chunks to avoid
a limitation of cvs.  ("Protocol error: too many arguments")

sync with head

Mark a potentially unused variable

sync with head

Sync with HEAD (-D20101022).

sync with head

Add support to honor MTU settings from DHCP during netboot.

Defines IP_MIN_MTU as 576.

Glanced over quickly by martin@ and joerg@.

Sync with HEAD.

Commit is split, to avoid a "too many arguments" protocol error.

sync with head.

Sync with HEAD.

Update comments to reflect realities; the filenames were changed in 1997
and another one was added years ago.

Sync with HEAD.

Sync with HEAD.

Update haad-dm branch to haad-dm-base2.

Make the emulations, exec formats, coredump, NFS, and the NFS server
into modules. By and large this commit:

- shuffles header files and ifdefs
- splits code out where necessary to be modular
- adds module glue for each of the components
- adds/replaces hooks for things that can be installed at runtime

make this build again without having
NFS_BOOT_BOOTSTATIC, NFS_BOOT_BOOTP, NFS_BOOT_DHCP or NFS_BOOT_BOOTPARAM
defined.

I uncovered this case when compiling rump.

change nfs boot behaviour to automatically try next boot method if boot information are incomplete to succeed.
That way, it is possible combine static and dhcp boot:
  For example, to boot diskless you can specify the nfs-server and the rootpath statically. All other information will be taken via dhcp.

Patch has been presented on port-xen, tech-kern and tech-net:
http://mail-index.netbsd.org/port-xen/2008/10/24/msg004488.html
http://mail-index.netbsd.org/tech-kern/2008/10/24/msg003255.html
http://mail-index.netbsd.org/tech-net/2008/10/24/msg000864.html

No comments, no objections.

- ansify function definition
- de- __P
- u_int32_t -> uint32_t

No functional changes.

Sync with HEAD.

Sync with HEAD.

Sync with wrstuden-revivesa-base-2.

Convert socket options code to use a sockopt structure
instead of laying everything into an mbuf.

approved by core

Sync w/ -current. 34 merge conflicts to follow.

sync with head

Sync with HEAD.

Delete unnecessary cast to void *.

sync with head.

sync with head.

Remove clause 3 and 4 from TNF licenses

Merge the socket locking patch:

- Socket layer becomes MP safe.
- Unix protocols become MP safe.
- Allows protocol processing interrupts to safely block on locks.
- Fixes a number of race conditions.

With much feedback from matt@ and plunky@.

use aprint_*_dev and device_xname

sync with HEAD

Sync with head.

Sync with HEAD.

sync with head.

Sync with HEAD.

Use sockaddr_in_init() and ifreq_setaddr() to initialize a sockaddr_in
and an ifreq.ifr_addr, respectively.  Get rid of an extraneous
cast---down the elevator shaft!  Change 'ireq' to 'ifr', which is
what the kernel calls a temporary struct ifreq virtually everywhere
else.

Sync with HEAD.

Sync with HEAD.

Take steps to hide the radix_node implementation of the forwarding table
from the forwarding table's users:

        Introduce rt_walktree() for walking the routing table and
        applying a function to each rtentry.  Replace most
        rn_walktree() calls with it.

        Use rt_getkey()/rt_setkey() to get/set a route's destination.
        Keep a pointer to the sockaddr key in the rtentry, so that
        rtentry users do not have to grovel in the radix_node for
        the key.

        Add a RTM_GET method to rtrequest.  Use that instead of
        radix_node lookups in, e.g., carp(4).

Add sys/net/link_proto.c, which supplies sockaddr routines for
link-layer socket addresses (sockaddr_dl).

Cosmetic:

        Constify.  KNF.  Stop open-coding LIST_FOREACH, TAILQ_FOREACH,
        et cetera.  Use NULL instead of 0 for null pointers.  Use
        __arraycount().  Reduce gratuitous parenthesization.

        Stop using variadic arguments for rip6_output(), it is
        unnecessary.

        Remove the unnecessary rtentry member rt_genmask and the
        code to maintain it, since nothing actually used it.

        Make rt_maskedcopy() easier to read by using meaningful variable
        names.

        Extract a subroutine intern_netmask() for looking up a netmask in
        the masks table.

        Start converting backslash-ridden IPv6 macros in
        sys/netinet6/in6_var.h into inline subroutines that one
        can read without special eyeglasses.

One functional change: when the kernel serves an RTM_GET, RTM_LOCK,
or RTM_CHANGE request, it applies the netmask (if supplied) to a
destination before searching for it in the forwarding table.

I have changed sys/netinet/ip_carp.c, carp_setroute(), to remove
the unlawful radix_node knowledge.

Apart from the changes to carp(4), netiso, ATM, and strip(4), I
have run the changes on three nodes in my wireless routing testbed,
which involves IPv4 + IPv6 dynamic routing acrobatics, and it's
working beautifully so far.

file nfs_boot.c was added on branch matt-mips64 on 2007-07-19 20:49:01 +0000

Take steps to hide the radix_node implementation of the forwarding table
from the forwarding table's users:

        Introduce rt_walktree() for walking the routing table and
        applying a function to each rtentry.  Replace most
        rn_walktree() calls with it.

        Use rt_getkey()/rt_setkey() to get/set a route's destination.
        Keep a pointer to the sockaddr key in the rtentry, so that
        rtentry users do not have to grovel in the radix_node for
        the key.

        Add a RTM_GET method to rtrequest.  Use that instead of
        radix_node lookups in, e.g., carp(4).

Add sys/net/link_proto.c, which supplies sockaddr routines for
link-layer socket addresses (sockaddr_dl).

Cosmetic:

        Constify.  KNF.  Stop open-coding LIST_FOREACH, TAILQ_FOREACH,
        et cetera.  Use NULL instead of 0 for null pointers.  Use
        __arraycount().  Reduce gratuitous parenthesization.

        Stop using variadic arguments for rip6_output(), it is
        unnecessary.

        Remove the unnecessary rtentry member rt_genmask and the
        code to maintain it, since nothing actually used it.

        Make rt_maskedcopy() easier to read by using meaningful variable
        names.

        Extract a subroutine intern_netmask() for looking up a netmask in
        the masks table.

        Start converting backslash-ridden IPv6 macros in
        sys/netinet6/in6_var.h into inline subroutines that one
        can read without special eyeglasses.

One functional change: when the kernel serves an RTM_GET, RTM_LOCK,
or RTM_CHANGE request, it applies the netmask (if supplied) to a
destination before searching for it in the forwarding table.

I have changed sys/netinet/ip_carp.c, carp_setroute(), to remove
the unlawful radix_node knowledge.

Apart from the changes to carp(4), netiso, ATM, and strip(4), I
have run the changes on three nodes in my wireless routing testbed,
which involves IPv4 + IPv6 dynamic routing acrobatics, and it's
working beautifully so far.

Sync with head.

Sync with head.

Cosmetic: de-__P() et cetera.

Sync with head.

sync with head.

Pull up revisions 1.65-1.66 (requested by manu in ticket #635).

Add the TFTPROOT kernel option for TFTP'ing root RAMdisk at root mount time.
This allows working around situations where a kernel with embedded RAMdisk
cannot be booted by the bootloader because the RAMdisk is too big.

Fix build (broken by a fix introduced in the wrong file...)

Fix buid (broken by a fix introduced in the wrong file...)

Add the TFTPROOT kernel option for TFTP'ing root RAMdisk at root mount time.
This allows working around situations where a kernel with embedded RAMdisk
cannot be booted by the bootloader because the RAMdisk is too big.

Sync with HEAD.

Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

sync with head

sync with head.

Sync with head.

merge yamt-uio_vmspace branch.

- use vmspace rather than proc or lwp where appropriate.
  the latter is more natural to specify an address space.
  (and less likely to be abused for random purposes.)
- fix a swdmover race.

- adapt nfs.
- nfs_doio_read: #if 0 out "killproc if text is modified" part of
  the code as it's broken.  (a process reading the modified text is not
  necessarily a process which is using the file as a text.)

merge ktrace-lwp.

Adapt to branch.

Fix the sync with head I botched.

Sync with HEAD.

Sync with HEAD

Eliminate several uses of `curproc' from the socket-layer code and from NFS.

Add a new explicit `struct proc *p' argument to socreate(), sosend().
Use that argument instead of curproc. Follow-on changes to pass that
argument to socreate(), sosend(), and (*so->so_send)() calls.
These changes reviewed and independently recoded  by Matt Thomas.

Changes to soreceive() and (*dom->dom_exernalize() from Matt Thomas:
pass soreceive()'s struct uio* uio->uio_procp to unp_externalize().
Eliminate curproc from unp_externalize.   Also, now soreceive() uses
its uio->uio_procp value, pass that same value downward to
((pr->pru_usrreq)() calls for consistency, instead of (struct proc * )0.

Similar changes in sys/nfs to eliminate (most) uses of curproc,
either via the req-> r_procp field of a struct nfsreq *req argument,
or by passing down new explicit struct proc * arguments.

Reviewed by: Matt Thomas, posted to tech-kern.
NB: The (*pr->pru_usrreq)() change should be tested on more (all!) protocols.

Add static nfs boot configuration, from the kernel config file or from
a driver selectable callback function.  This is used in the Xen port to
allow controlling  the domain's network setup from the domain building
environment at domain creation (vs. having to maintain/change this on a
dhcp server).  The Xen network driver parses a command line passed in
from the domain builder.

Apply the aborted ktrace-lwp changes to a specific branch.  This is just for
others to review, I'm concerned that patch fuziness may have resulted in some
errant code being generated but I'll look at that later by comparing the diff
from the base to the branch with the file I attempt to apply to it.  This will,
at the very least, put the changes in a better context for others to review
them and attempt to tinker with removing passing of 'struct lwp' through
the kernel.

Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records.  The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

No longer need to pull in lwp.h; proc.h pulls it in for us.

Curproc->curlwp renaming.

Change uses of "curproc->l_proc" back to "curproc", which is more like the
original use. Bare uses of "curproc" are now "curlwp".

"curproc" is now #defined in proc.h as ((curlwp) ? (curlwp)->l_proc) : NULL)
so that it is always safe to reference curproc (*de*referencing curproc
is another story, but that's always been true).

Sync kqueue branch with -current.

Catch up to -current.

Sync the thorpej-mips-cache branch with -current.

add RCSIDs

Initial commit of scheduler activations and lightweight process support.

Sync with HEAD.

Use tsleep instead of dalay; since we're mounting root, we can sleep
and no reason to use delay.

Pull up revision 1.55 (requested by fvdl):
  Fix NFS+tcp client hangs on server or network outage.  Again,
  please note that this introduces yet another kernel interface
  change: sobind() gains an argument.

Sync with HEAD (for UBC fixes).

Make sobind() take a struct proc *. It already took curproc and
passed it down to the appropriate usrreq function, and this
allows usage for contexts that need to be explicitly different
from curproc (like in the NFS code when binding to a reserved port).

Update thorpej_scsipi to -current as of a month ago

New kernel option, NFS_V2_ONLY, which aims to reduce the NFS client to just
that required to support NFSv2 mounts.  Not finished yet, but already
provides some 44k of saving in code size on arm26.  More savings, and some
documentation, are still to come.

Don't need to include <sys/conf.h> here.

Pull up revisions 1.51-1.52 (requested by drochner):
  Mount diskless root with "noconn" option to allow easier use of
  multi-homed servers.
  Wait a while between bringing up interface and using it, to allow
  e.g. if_ti driver to establish the link.

Wait some seconds after the interface is brought up before packets
are sent. Needed at least for if_ti to get the link up.

Update from trunk.

mount diskless root with "NFSMNT_NOCONN" (which is default in "mount_nfs"
for quite a while) to allow certain servers (multihomed, as our DEC NSE
cluster) to be used as root filesystem without special tweaks

restructure the diskless NFS boot code to keep track of the used
interface and the address allocated, to roll everything back if the
mount fails:
-put an interface pointer into "struct nfs_diskless" to have it
 available for cleanup, don't pass it around anymore where the
 "struct nfs_diskless" is already passed
-add a "cleanup" function which shuts the interface down
-in the protocol-specific parts, either return with "everything
 ready" or "completely shut down"
-use common functions for interface initialization and shutdown
-add a function to delete all routes associate to an interface
 (why is this necessary and not done by ~IFF_UP?)
g/c diskless swap stuff
general cleanup

Fix copyright spacing.

bzero->memset, bcopy->memcpy, bcmp->memcmp

Fix last change: If BOOTP/DHCP was successful, don't try RARP/BOOTPARAM.

Clean up boogered gcc warning workaround (remove goto completely) and remove
a redundant `if'.

Adapt to new sosend/soreceive and upcall (now down in sowakeup)

Merge with Lite2 + local changes

be a bit more clear about what protocols will be tried in the
BOOTP/DHCP case.

Consolidate NFS_BOOT_* options into opt_nfs_boot.h

Make NFS_BOOT_DHCP work as expected.

Use new options "NFS_BOOT_BOOTP" and "NFS_BOOT_BOOTPARAM" for parts
conditional on a particular configuration method.
The global flags "nfs_boot_rfc951" and "nfs_boot_bootparam" control
independantly if the functions are actually called. (Previous meaning
of "nfs_boot_rfc951" was "either-or".)

Update marc-pcmcia branch from trunk.

Factor out some functions used by bootparam and DHCP boot.

Update marc-pcmcia branch from trunk.

Correct a comment regarding the sense of the nfs_boot_rfc951 global.

Move the call to nfs_boot_getfh() from nfs_vfsops.c to nfs_boot.c
(just for better isolation - it can now be static)

Update marc-pcmcia branch from trunk.

Change test from NETHER to NARP (revarpwhoami is in if_arp.c)

Update marc-pcmcia branch from trunk.

Supporting changes for the new BOOTP support in nfs_mountroot.

Update marc-pcmcia branch from trunk.

1. Allow to set a netmask (option NFS_BOOT_NETMASK) for the booting
   interface. Without this, NFS_BOOT_NETMASK could be useless in
   subnetting envirinment.
2. Comment out unneeded NFS swap related stuff.
   Closes PR kern/3918.

Minor reorganization of nfs_mountroot code to simplify BOOTP support.
The RPC/bootparamd calls to get the root and swap paths are now done
in nfs_boot_init() instead of nfs_boot_getfh(), so the latter now just
does the RPC/mountd call.  Also changed some panics into error returns.

Add some missing "\n"'s.

New ARP system, supports IPv4 over any hardware link.

Some of the stuff (e.g., rarpd, bootpd, dhcpd etc., libsa) still will
only support Ethernet. Tcpdump itself should be ok, but libpcap needs
lot of work.

For the detailed change history, look at the commit log entries for
the is-newarp branch.

netinet/if_ether.h => netinet/if_inarp.h

Snapshot of new ARP code.

Our old ARP code was hardwired for 6-byte length medium
addresses, while the protocol is designed for any size.

This snapshot contains a first hack at getting rid of
Ethernet specific data structures. The ep driver is updated
(and tested on the PCI bus), the iy and fpa drivers have been
updated, but not real life tested yet.

If you want to test this with other drivers, you have to update
them first yourself, and probably tag the relevant directories.
Better contact me if you want to do this.

- Don't look for a "suitable interface"; we're now given the name of the
  network interface to use.
- If any part of the NFS root mount process fails, don't panic.
  Simply return the appropriate error and let the caller recover.

Snapshot of work-in-progress, committed to private branch.

These changes implement machine-independent root device and file system
selection.  Notable features:

	- All ports behave in a consistent manner regarding root
	  device selection.
	- No more "options GENERIC"; all kernels have the ability
	  to boot with RB_ASKNAME to select root device and file system
	  type.
	- Root file system type can be wildcarded; a machine-independent
	  function will try all possible file systems for the selected
	  root device until one succeeds.
	- If the root file system fails to mount, the operator will
	  be given the chance to select a new root device and file
	  system type, rather than having the machine simply panic.
	- nfs_mountroot() no longer panics if any part of the NFS
	  mount process fails; it now returns an error, giving the
	  operator a chance to recover.
	- New, more consistent, config(8) grammar.  The constructs:

		config netbsd swap generic
		config netbsd root on nfs

	  have been replaced with:

		config netbsd root on ? type ?
		config netbsd root on ? type nfs

	  Additionally, the operator may select or wildcard root file
	  system type in the kernel configuration file:

		config netbsd root on cd0a type cd9660

	  config(8) now requires that a "root" specification be
	  made.  "root" may be wired down or wildcarded.  "swap" and
	  "dump" specifications are optional, and follow previous
	  semantics.

	- config(8) has a new "file-system" keyword, used to configure
	  file systems into the kernel.  Eventually, this will be used
	  to generate the default vfssw[].

	- "options NFSCLIENT" is obsolete, and is replaced by
	  "file-system NFS".  "options NFSSERVER" still exists, since
	  NFS server support is independent of the NFS file system
	  client.

	- sys/arch/<foo>/<foo>/swapgeneric.c is no longer used, and
	  will be removed; all information is now generated by config(8).

As of this commit, all ports except arm32 have been updated to use
the new setroot().  Only SPARC, i386, and Alpha ports have been
tested at this time.  Port masters should test these changes on their
ports, and report any problems back to me.

More changes are on their way, including RB_ASKNAME support in
nfs_mountroot() (to prompt for server address and path) and, potentially,
the ability to select rarp/bootparam or bootp in nfs_mountroot().

Enhancements from Matthias Drochner:
	- Try V3 first for diskless booting. Fall back to V2 if V3 fails.
	- optionally (option NFS_BOOT_TCP) try a TCP mount first
	  for diskless booting. Fall back to UDP if it fails.
	- Enable switching between UDP and TCP for remounts.

revert kprintf changes

printf -> kprintf, sprintf -> ksprintf

Changed struct ifnet to have a pointer to the softc of the underlying
device and a printable "external name" (name + unit number), thus eliminating
if_name and if_unit.  Updated interface to (*if_watchdog)() and (*if_reset)()
to take a struct ifnet *, rather than a unit number.

Bring in a merge of Rick Macklem's NFSv3 code from Lite2

Add stub for nfs_boot_getfh if NETHER==0

Do the RPC to bootparamd a little later (just before the mountd call)
so that we do not ask for the "swap" path when swapping on disk.

Don't return EBADRPC if we have something else.

nfs prototype changes

changes to make this work on systems where pointers & longs are 64 bits.
This is mostly just changes to make the stuff that goes over the wire
use fixed-size types.

Various cleanup, including:
* Convert several data structures to use queue.h.
* Split in_pcbnotify() into two parts; one for notifying a specific PCB, and
one for notifying all PCBs for a particular foreign address.

don't blindly set IFF_UP; or it with old flags

Use fxdr_*() and txdr_*() macros to do byte order conversions.

Fixed RPC code to deal with RPC messages larger than one mbuf.

Cosmetic changes suggested by Adam.

Do the printf "root/swap on" elsewhere to avoid confusion.

Working "config generic" support; from Theo.

fix a couple of obvious, painful endianness bugs introduced in last commit.

Do the first BOOTPARAM RPC call to the broadcast address instead of
using the address of the RARP server because a BOOTPARAM server
might not be running on the machine that sent the RARP reply.

update from trunk

char * --> caddr_t, where appropriate.

Diskless boot will now bind the local socket to a reserved port to
satisfy picky servers.  Also fix some missing initializations.
(Thanks to Chuck Cranor for PR#394 -- now fixed.)

from trunk, per gwr.

Fix the conditionally compiled code inside #ifdef NFS_BOOT_GATEWAY
and make some printf args use host byteorder.

update from trunk, per paulus

If we don't have ethernet, nfs_boot_init reduces to just a panic.
This is so I don't get an undefined symbol compiling a kernel with
NFSCLIENT but no ethernet.

knf

New RCS ID's, take two.  they're more aesthecially pleasant, and use 'NetBSD'

Construct mountpath for remote root.

New diskless boot code (uses RARP, bootparamd).

lots of changes: prototype migration, move lots of variables, definitions,
and structure elements around.  kill some unnecessary type and macro
definitions.  standardize clock handling.  More changes than you'd want.

revised nfs diskless support.  uses bootp+rpc to gather parameters