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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) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License version 2.
 */

#ifndef __DIR_DOT_H__
#define __DIR_DOT_H__

#include <linux/dcache.h>

struct inode;
struct gfs2_inode;
struct gfs2_inum;

struct inode *gfs2_dir_search(struct inode *dir, const struct qstr *filename);
int gfs2_dir_check(struct inode *dir, const struct qstr *filename,
		   const struct gfs2_inode *ip);
int gfs2_dir_add(struct inode *inode, const struct qstr *filename,
		 const struct gfs2_inode *ip, unsigned int type);
int gfs2_dir_del(struct gfs2_inode *dip, const struct qstr *filename);
int gfs2_dir_read(struct inode *inode, u64 *offset, void *opaque,
		  filldir_t filldir);
int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
		   const struct gfs2_inode *nip, unsigned int new_type);

int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip);

int gfs2_diradd_alloc_required(struct inode *dir,
			       const struct qstr *filename);
int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
			    struct buffer_head **bhp);

static inline u32 gfs2_disk_hash(const char *data, int len)
{
        return crc32_le((u32)~0, data, len) ^ (u32)~0;
}


static inline void gfs2_str2qstr(struct qstr *name, const char *fname)
{
	name->name = fname;
	name->len = strlen(fname);
	name->hash = gfs2_disk_hash(name->name, name->len);
}

/* N.B. This probably ought to take inum & type as args as well */
static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent)
{
	dent->de_inum.no_addr = cpu_to_be64(0);
	dent->de_inum.no_formal_ino = cpu_to_be64(0);
	dent->de_hash = cpu_to_be32(name->hash);
	dent->de_rec_len = cpu_to_be16(reclen);
	dent->de_name_len = cpu_to_be16(name->len);
	dent->de_type = cpu_to_be16(0);
	memset(dent->__pad, 0, sizeof(dent->__pad));
	memcpy(dent + 1, name->name, name->len);
}

#endif /* __DIR_DOT_H__ */