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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.

/*
 * Copyright (c) International Business Machines Corp., 2006
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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 the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Author: Artem Bityutskiy (Битюцкий Артём)
 */

/* Here we keep miscellaneous functions which are used all over the UBI code */

#include "ubi.h"

/**
 * calc_data_len - calculate how much real data is stored in a buffer.
 * @ubi: UBI device description object
 * @buf: a buffer with the contents of the physical eraseblock
 * @length: the buffer length
 *
 * This function calculates how much "real data" is stored in @buf and returnes
 * the length. Continuous 0xFF bytes at the end of the buffer are not
 * considered as "real data".
 */
int ubi_calc_data_len(const struct ubi_device *ubi, const void *buf,
		      int length)
{
	int i;

	ubi_assert(length % ubi->min_io_size == 0);

	for (i = length - 1; i >= 0; i--)
		if (((const uint8_t *)buf)[i] != 0xFF)
			break;

	/* The resulting length must be aligned to the minimum flash I/O size */
	length = ALIGN(i + 1, ubi->min_io_size);
	return length;
}

/**
 * ubi_check_volume - check the contents of a static volume.
 * @ubi: UBI device description object
 * @vol_id: ID of the volume to check
 *
 * This function checks if static volume @vol_id is corrupted by fully reading
 * it and checking data CRC. This function returns %0 if the volume is not
 * corrupted, %1 if it is corrupted and a negative error code in case of
 * failure. Dynamic volumes are not checked and zero is returned immediately.
 */
int ubi_check_volume(struct ubi_device *ubi, int vol_id)
{
	void *buf;
	int err = 0, i;
	struct ubi_volume *vol = ubi->volumes[vol_id];

	if (vol->vol_type != UBI_STATIC_VOLUME)
		return 0;

	buf = vmalloc(vol->usable_leb_size);
	if (!buf)
		return -ENOMEM;

	for (i = 0; i < vol->used_ebs; i++) {
		int size;

		if (i == vol->used_ebs - 1)
			size = vol->last_eb_bytes;
		else
			size = vol->usable_leb_size;

		err = ubi_eba_read_leb(ubi, vol_id, i, buf, 0, size, 1);
		if (err) {
			if (err == -EBADMSG)
				err = 1;
			break;
		}
	}

	vfree(buf);
	return err;
}

/**
 * ubi_calculate_rsvd_pool - calculate how many PEBs must be reserved for bad
 * eraseblock handling.
 * @ubi: UBI device description object
 */
void ubi_calculate_reserved(struct ubi_device *ubi)
{
	ubi->beb_rsvd_level = ubi->good_peb_count/100;
	ubi->beb_rsvd_level *= CONFIG_MTD_UBI_BEB_RESERVE;
	if (ubi->beb_rsvd_level < MIN_RESEVED_PEBS)
		ubi->beb_rsvd_level = MIN_RESEVED_PEBS;
}