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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.

/*
 *  debugfs.h - a tiny little debug file system
 *
 *  Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
 *  Copyright (C) 2004 IBM Inc.
 *
 *	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.
 *
 *  debugfs is for people to use instead of /proc or /sys.
 *  See Documentation/DocBook/kernel-api for more details.
 */

#ifndef _DEBUGFS_H_
#define _DEBUGFS_H_

#include <linux/fs.h>

#include <linux/types.h>

struct file_operations;

struct debugfs_blob_wrapper {
	void *data;
	unsigned long size;
};

#if defined(CONFIG_DEBUG_FS)
struct dentry *debugfs_create_file(const char *name, mode_t mode,
				   struct dentry *parent, void *data,
				   const struct file_operations *fops);

struct dentry *debugfs_create_dir(const char *name, struct dentry *parent);

struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent,
				      const char *dest);

void debugfs_remove(struct dentry *dentry);

struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
                struct dentry *new_dir, const char *new_name);

struct dentry *debugfs_create_u8(const char *name, mode_t mode,
				 struct dentry *parent, u8 *value);
struct dentry *debugfs_create_u16(const char *name, mode_t mode,
				  struct dentry *parent, u16 *value);
struct dentry *debugfs_create_u32(const char *name, mode_t mode,
				  struct dentry *parent, u32 *value);
struct dentry *debugfs_create_u64(const char *name, mode_t mode,
				  struct dentry *parent, u64 *value);
struct dentry *debugfs_create_bool(const char *name, mode_t mode,
				  struct dentry *parent, u32 *value);

struct dentry *debugfs_create_blob(const char *name, mode_t mode,
				  struct dentry *parent,
				  struct debugfs_blob_wrapper *blob);
#else

#include <linux/err.h>

/* 
 * We do not return NULL from these functions if CONFIG_DEBUG_FS is not enabled
 * so users have a chance to detect if there was a real error or not.  We don't
 * want to duplicate the design decision mistakes of procfs and devfs again.
 */

static inline struct dentry *debugfs_create_file(const char *name, mode_t mode,
					struct dentry *parent, void *data,
					const struct file_operations *fops)
{
	return ERR_PTR(-ENODEV);
}

static inline struct dentry *debugfs_create_dir(const char *name,
						struct dentry *parent)
{
	return ERR_PTR(-ENODEV);
}

static inline struct dentry *debugfs_create_symlink(const char *name,
						    struct dentry *parent,
						    const char *dest)
{
	return ERR_PTR(-ENODEV);
}

static inline void debugfs_remove(struct dentry *dentry)
{ }

static inline struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
                struct dentry *new_dir, char *new_name)
{
	return ERR_PTR(-ENODEV);
}

static inline struct dentry *debugfs_create_u8(const char *name, mode_t mode,
					       struct dentry *parent,
					       u8 *value)
{
	return ERR_PTR(-ENODEV);
}

static inline struct dentry *debugfs_create_u16(const char *name, mode_t mode,
						struct dentry *parent,
						u16 *value)
{
	return ERR_PTR(-ENODEV);
}

static inline struct dentry *debugfs_create_u32(const char *name, mode_t mode,
						struct dentry *parent,
						u32 *value)
{
	return ERR_PTR(-ENODEV);
}

static inline struct dentry *debugfs_create_u64(const char *name, mode_t mode,
						struct dentry *parent,
						u64 *value)
{
	return ERR_PTR(-ENODEV);
}

static inline struct dentry *debugfs_create_bool(const char *name, mode_t mode,
						 struct dentry *parent,
						 u32 *value)
{
	return ERR_PTR(-ENODEV);
}

static inline struct dentry *debugfs_create_blob(const char *name, mode_t mode,
				  struct dentry *parent,
				  struct debugfs_blob_wrapper *blob)
{
	return ERR_PTR(-ENODEV);
}

#endif

#endif