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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 FID Management
 *
 *  Copyright (C) 2005, 2006 by Eric Van Hensbergen <ericvh@gmail.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to:
 *  Free Software Foundation
 *  51 Franklin Street, Fifth Floor
 *  Boston, MA  02111-1301  USA
 *
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/idr.h>
#include <asm/semaphore.h>
#include <net/9p/9p.h>
#include <net/9p/client.h>

#include "v9fs.h"
#include "v9fs_vfs.h"
#include "fid.h"

/**
 * v9fs_fid_insert - add a fid to a dentry
 * @fid: fid to add
 * @dentry: dentry that it is being added to
 *
 */

int v9fs_fid_add(struct dentry *dentry, struct p9_fid *fid)
{
	struct v9fs_dentry *dent;

	P9_DPRINTK(P9_DEBUG_VFS, "fid %d dentry %s\n",
					fid->fid, dentry->d_iname);

	dent = dentry->d_fsdata;
	if (!dent) {
		dent = kmalloc(sizeof(struct v9fs_dentry), GFP_KERNEL);
		if (!dent)
			return -ENOMEM;

		spin_lock_init(&dent->lock);
		INIT_LIST_HEAD(&dent->fidlist);
		dentry->d_fsdata = dent;
	}

	spin_lock(&dent->lock);
	list_add(&fid->dlist, &dent->fidlist);
	spin_unlock(&dent->lock);

	return 0;
}

/**
 * v9fs_fid_lookup - return a locked fid from a dentry
 * @dentry: dentry to look for fid in
 *
 * find a fid in the dentry, obtain its semaphore and return a reference to it.
 * code calling lookup is responsible for releasing lock
 *
 * TODO: only match fids that have the same uid as current user
 *
 */

struct p9_fid *v9fs_fid_lookup(struct dentry *dentry)
{
	struct v9fs_dentry *dent;
	struct p9_fid *fid;

	P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
	dent = dentry->d_fsdata;
	if (dent)
		fid = list_entry(dent->fidlist.next, struct p9_fid, dlist);
	else
		fid = ERR_PTR(-EBADF);

	P9_DPRINTK(P9_DEBUG_VFS, " fid: %p\n", fid);
	return fid;
}

/**
 * v9fs_fid_clone - lookup the fid for a dentry, clone a private copy and
 * 	release it
 * @dentry: dentry to look for fid in
 *
 * find a fid in the dentry and then clone to a new private fid
 *
 * TODO: only match fids that have the same uid as current user
 *
 */

struct p9_fid *v9fs_fid_clone(struct dentry *dentry)
{
	struct p9_fid *ofid, *fid;

	P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
	ofid = v9fs_fid_lookup(dentry);
	if (IS_ERR(ofid))
		return ofid;

	fid = p9_client_walk(ofid, 0, NULL, 1);
	return fid;
}