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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.

#ifndef __LINUX_KMOD_H__
#define __LINUX_KMOD_H__

/*
 *	include/linux/kmod.h
 *
 *      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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/stddef.h>
#include <linux/errno.h>
#include <linux/compiler.h>

#define KMOD_PATH_LEN 256

#ifdef CONFIG_KMOD
/* modprobe exit status on success, -ve on error.  Return value
 * usually useless though. */
extern int request_module(const char * name, ...) __attribute__ ((format (printf, 1, 2)));
#else
static inline int request_module(const char * name, ...) { return -ENOSYS; }
#endif

#define try_then_request_module(x, mod...) ((x) ?: (request_module(mod), (x)))

struct key;
struct file;
struct subprocess_info;

/* Allocate a subprocess_info structure */
struct subprocess_info *call_usermodehelper_setup(char *path,
						  char **argv, char **envp);

/* Set various pieces of state into the subprocess_info structure */
void call_usermodehelper_setkeys(struct subprocess_info *info,
				 struct key *session_keyring);
int call_usermodehelper_stdinpipe(struct subprocess_info *sub_info,
				  struct file **filp);
void call_usermodehelper_setcleanup(struct subprocess_info *info,
				    void (*cleanup)(char **argv, char **envp));

enum umh_wait {
	UMH_NO_WAIT = -1,	/* don't wait at all */
	UMH_WAIT_EXEC = 0,	/* wait for the exec, but not the process */
	UMH_WAIT_PROC = 1,	/* wait for the process to complete */
};

/* Actually execute the sub-process */
int call_usermodehelper_exec(struct subprocess_info *info, enum umh_wait wait);

/* Free the subprocess_info. This is only needed if you're not going
   to call call_usermodehelper_exec */
void call_usermodehelper_freeinfo(struct subprocess_info *info);

static inline int
call_usermodehelper(char *path, char **argv, char **envp, enum umh_wait wait)
{
	struct subprocess_info *info;

	info = call_usermodehelper_setup(path, argv, envp);
	if (info == NULL)
		return -ENOMEM;
	return call_usermodehelper_exec(info, wait);
}

static inline int
call_usermodehelper_keys(char *path, char **argv, char **envp,
			 struct key *session_keyring, enum umh_wait wait)
{
	struct subprocess_info *info;

	info = call_usermodehelper_setup(path, argv, envp);
	if (info == NULL)
		return -ENOMEM;

	call_usermodehelper_setkeys(info, session_keyring);
	return call_usermodehelper_exec(info, wait);
}

extern void usermodehelper_init(void);

struct file;
extern int call_usermodehelper_pipe(char *path, char *argv[], char *envp[],
				    struct file **filp);

#endif /* __LINUX_KMOD_H__ */