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Update 2.6.x-xfs to 2.6.23-rc4.

Also update fs/xfs with external mainline changes.
There were 12 such missing commits that I detected:

--------
commit ad690ef9e690f6c31f7d310b09ef1314bcec9033
Author: Al Viro <viro@ftp.linux.org.uk>
    xfs ioctl __user annotations

commit 20c2df83d25c6a95affe6157a4c9cac4cf5ffaac
Author: Paul Mundt <lethal@linux-sh.org>
    mm: Remove slab destructors from kmem_cache_create().

commit d0217ac04ca6591841e5665f518e38064f4e65bd
Author: Nick Piggin <npiggin@suse.de>
    mm: fault feedback #1

commit 54cb8821de07f2ffcd28c380ce9b93d5784b40d7
Author: Nick Piggin <npiggin@suse.de>
    mm: merge populate and nopage into fault (fixes nonlinear)

commit d00806b183152af6d24f46f0c33f14162ca1262a
Author: Nick Piggin <npiggin@suse.de>
    mm: fix fault vs invalidate race for linear mappings

commit a569425512253992cc64ebf8b6d00a62f986db3e
Author: Christoph Hellwig <hch@infradead.org>
    knfsd: exportfs: add exportfs.h header

commit 831441862956fffa17b9801db37e6ea1650b0f69
Author: Rafael J. Wysocki <rjw@sisk.pl>
    Freezer: make kernel threads nonfreezable by default

commit 8e1f936b73150f5095448a0fee6d4f30a1f9001d
Author: Rusty Russell <rusty@rustcorp.com.au>
    mm: clean up and kernelify shrinker registration

commit 5ffc4ef45b3b0a57872f631b4e4ceb8ace0d7496
Author: Jens Axboe <jens.axboe@oracle.com>
    sendfile: remove .sendfile from filesystems that use generic_file_sendfile()

commit 8bb7844286fb8c9fce6f65d8288aeb09d03a5e0d
Author: Rafael J. Wysocki <rjw@sisk.pl>
    Add suspend-related notifications for CPU hotplug

commit 59c51591a0ac7568824f541f57de967e88adaa07
Author: Michael Opdenacker <michael@free-electrons.com>
    Fix occurrences of "the the "

commit 0ceb331433e8aad9c5f441a965d7c681f8b9046f
Author: Dmitriy Monakhov <dmonakhov@openvz.org>
    mm: move common segment checks to separate helper function
--------
Merge of 2.6.x-xfs-melb:linux:29656b by kenmcd.

	  	    v9fs: Plan 9 Resource Sharing for Linux
		    =======================================

ABOUT
=====

v9fs is a Unix implementation of the Plan 9 9p remote filesystem protocol.

This software was originally developed by Ron Minnich <rminnich@sandia.gov>
and Maya Gokhale.  Additional development by Greg Watson
<gwatson@lanl.gov> and most recently Eric Van Hensbergen
<ericvh@gmail.com>, Latchesar Ionkov <lucho@ionkov.net> and Russ Cox
<rsc@swtch.com>.

The best detailed explanation of the Linux implementation and applications of
the 9p client is available in the form of a USENIX paper:
   http://www.usenix.org/events/usenix05/tech/freenix/hensbergen.html

Other applications are described in the following papers:
	* XCPU & Clustering
		http://www.xcpu.org/xcpu-talk.pdf
	* KVMFS: control file system for KVM
		http://www.xcpu.org/kvmfs.pdf
	* CellFS: A New ProgrammingModel for the Cell BE
		http://www.xcpu.org/cellfs-talk.pdf
	* PROSE I/O: Using 9p to enable Application Partitions
		http://plan9.escet.urjc.es/iwp9/cready/PROSE_iwp9_2006.pdf

USAGE
=====

For remote file server:

	mount -t 9p 10.10.1.2 /mnt/9

For Plan 9 From User Space applications (http://swtch.com/plan9)

	mount -t 9p `namespace`/acme /mnt/9 -o proto=unix,uname=$USER

OPTIONS
=======

  proto=name	select an alternative transport.  Valid options are
  		currently:
 			unix - specifying a named pipe mount point
 			tcp  - specifying a normal TCP/IP connection
 			fd   - used passed file descriptors for connection
                                (see rfdno and wfdno)

  uname=name	user name to attempt mount as on the remote server.  The
  		server may override or ignore this value.  Certain user
		names may require authentication.

  aname=name	aname specifies the file tree to access when the server is
  		offering several exported file systems.

  cache=mode	specifies a cacheing policy.  By default, no caches are used.
			loose = no attempts are made at consistency,
                                intended for exclusive, read-only mounts

  debug=n	specifies debug level.  The debug level is a bitmask.
  			0x01 = display verbose error messages
			0x02 = developer debug (DEBUG_CURRENT)
			0x04 = display 9p trace
			0x08 = display VFS trace
			0x10 = display Marshalling debug
			0x20 = display RPC debug
			0x40 = display transport debug
			0x80 = display allocation debug

  rfdno=n	the file descriptor for reading with proto=fd

  wfdno=n	the file descriptor for writing with proto=fd

  maxdata=n	the number of bytes to use for 9p packet payload (msize)

  port=n	port to connect to on the remote server

  noextend	force legacy mode (no 9p2000.u semantics)

  uid		attempt to mount as a particular uid

  gid		attempt to mount with a particular gid

  afid		security channel - used by Plan 9 authentication protocols

  nodevmap	do not map special files - represent them as normal files.
  		This can be used to share devices/named pipes/sockets between
		hosts.  This functionality will be expanded in later versions.

RESOURCES
=========

Our current recommendation is to use Inferno (http://www.vitanuova.com/inferno)
as the 9p server.  You can start a 9p server under Inferno by issuing the
following command:
   ; styxlisten -A tcp!*!564 export '#U*'

The -A specifies an unauthenticated export.  The 564 is the port # (you may
have to choose a higher port number if running as a normal user).  The '#U*'
specifies exporting the root of the Linux name space.  You may specify a
subset of the namespace by extending the path: '#U*'/tmp would just export
/tmp.  For more information, see the Inferno manual pages covering styxlisten
and export.

A Linux version of the 9p server is now maintained under the npfs project
on sourceforge (http://sourceforge.net/projects/npfs).  The currently
maintained version is the single-threaded version of the server (named spfs)
available from the same CVS repository.

There are user and developer mailing lists available through the v9fs project
on sourceforge (http://sourceforge.net/projects/v9fs).

News and other information is maintained on SWiK (http://swik.net/v9fs).

Bug reports may be issued through the kernel.org bugzilla 
(http://bugzilla.kernel.org)

For more information on the Plan 9 Operating System check out
http://plan9.bell-labs.com/plan9

For information on Plan 9 from User Space (Plan 9 applications and libraries
ported to Linux/BSD/OSX/etc) check out http://swtch.com/plan9


STATUS
======

The 2.6 kernel support is working on PPC and x86.

PLEASE USE THE KERNEL BUGZILLA TO REPORT PROBLEMS. (http://bugzilla.kernel.org)