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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.

/* AFS client file system
 *
 * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/completion.h>
#include <linux/sched.h>
#include "internal.h"

MODULE_DESCRIPTION("AFS Client File System");
MODULE_AUTHOR("Red Hat, Inc.");
MODULE_LICENSE("GPL");

unsigned afs_debug;
module_param_named(debug, afs_debug, uint, S_IWUSR | S_IRUGO);
MODULE_PARM_DESC(afs_debug, "AFS debugging mask");

static char *rootcell;

module_param(rootcell, charp, 0);
MODULE_PARM_DESC(rootcell, "root AFS cell name and VL server IP addr list");

#ifdef AFS_CACHING_SUPPORT
static struct cachefs_netfs_operations afs_cache_ops = {
	.get_page_cookie	= afs_cache_get_page_cookie,
};

struct cachefs_netfs afs_cache_netfs = {
	.name			= "afs",
	.version		= 0,
	.ops			= &afs_cache_ops,
};
#endif

struct afs_uuid afs_uuid;

/*
 * get a client UUID
 */
static int __init afs_get_client_UUID(void)
{
	struct timespec ts;
	u64 uuidtime;
	u16 clockseq;
	int ret;

	/* read the MAC address of one of the external interfaces and construct
	 * a UUID from it */
	ret = afs_get_MAC_address(afs_uuid.node, sizeof(afs_uuid.node));
	if (ret < 0)
		return ret;

	getnstimeofday(&ts);
	uuidtime = (u64) ts.tv_sec * 1000 * 1000 * 10;
	uuidtime += ts.tv_nsec / 100;
	uuidtime += AFS_UUID_TO_UNIX_TIME;
	afs_uuid.time_low = uuidtime;
	afs_uuid.time_mid = uuidtime >> 32;
	afs_uuid.time_hi_and_version = (uuidtime >> 48) & AFS_UUID_TIMEHI_MASK;
	afs_uuid.time_hi_and_version = AFS_UUID_VERSION_TIME;

	get_random_bytes(&clockseq, 2);
	afs_uuid.clock_seq_low = clockseq;
	afs_uuid.clock_seq_hi_and_reserved =
		(clockseq >> 8) & AFS_UUID_CLOCKHI_MASK;
	afs_uuid.clock_seq_hi_and_reserved = AFS_UUID_VARIANT_STD;

	_debug("AFS UUID: %08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
	       afs_uuid.time_low,
	       afs_uuid.time_mid,
	       afs_uuid.time_hi_and_version,
	       afs_uuid.clock_seq_hi_and_reserved,
	       afs_uuid.clock_seq_low,
	       afs_uuid.node[0], afs_uuid.node[1], afs_uuid.node[2],
	       afs_uuid.node[3], afs_uuid.node[4], afs_uuid.node[5]);

	return 0;
}

/*
 * initialise the AFS client FS module
 */
static int __init afs_init(void)
{
	int ret;

	printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 registering.\n");

	ret = afs_get_client_UUID();
	if (ret < 0)
		return ret;

	/* register the /proc stuff */
	ret = afs_proc_init();
	if (ret < 0)
		return ret;

#ifdef AFS_CACHING_SUPPORT
	/* we want to be able to cache */
	ret = cachefs_register_netfs(&afs_cache_netfs,
				     &afs_cache_cell_index_def);
	if (ret < 0)
		goto error_cache;
#endif

	/* initialise the cell DB */
	ret = afs_cell_init(rootcell);
	if (ret < 0)
		goto error_cell_init;

	/* initialise the VL update process */
	ret = afs_vlocation_update_init();
	if (ret < 0)
		goto error_vl_update_init;

	/* initialise the callback update process */
	ret = afs_callback_update_init();

	/* create the RxRPC transport */
	ret = afs_open_socket();
	if (ret < 0)
		goto error_open_socket;

	/* register the filesystems */
	ret = afs_fs_init();
	if (ret < 0)
		goto error_fs;

	return ret;

error_fs:
	afs_close_socket();
error_open_socket:
error_vl_update_init:
error_cell_init:
#ifdef AFS_CACHING_SUPPORT
	cachefs_unregister_netfs(&afs_cache_netfs);
error_cache:
#endif
	afs_callback_update_kill();
	afs_vlocation_purge();
	afs_cell_purge();
	afs_proc_cleanup();
	rcu_barrier();
	printk(KERN_ERR "kAFS: failed to register: %d\n", ret);
	return ret;
}

/* XXX late_initcall is kludgy, but the only alternative seems to create
 * a transport upon the first mount, which is worse. Or is it?
 */
late_initcall(afs_init);	/* must be called after net/ to create socket */

/*
 * clean up on module removal
 */
static void __exit afs_exit(void)
{
	printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 unregistering.\n");

	afs_fs_exit();
	afs_kill_lock_manager();
	afs_close_socket();
	afs_purge_servers();
	afs_callback_update_kill();
	afs_vlocation_purge();
	flush_scheduled_work();
	afs_cell_purge();
#ifdef AFS_CACHING_SUPPORT
	cachefs_unregister_netfs(&afs_cache_netfs);
#endif
	afs_proc_cleanup();
	rcu_barrier();
}

module_exit(afs_exit);