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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 xfs-linux-melb:xfs-kern:29656a by kenmcd.

/*
 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * 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.
 *
 * This program is distributed in the hope that it would 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 the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef __XFS_LRW_H__
#define __XFS_LRW_H__

struct xfs_mount;
struct xfs_iocore;
struct xfs_inode;
struct xfs_bmbt_irec;
struct xfs_buf;
struct xfs_iomap;

#if defined(XFS_RW_TRACE)
/*
 * Defines for the trace mechanisms in xfs_lrw.c.
 */
#define	XFS_RW_KTRACE_SIZE	128

#define	XFS_READ_ENTER		1
#define	XFS_WRITE_ENTER		2
#define XFS_IOMAP_READ_ENTER	3
#define	XFS_IOMAP_WRITE_ENTER	4
#define	XFS_IOMAP_READ_MAP	5
#define	XFS_IOMAP_WRITE_MAP	6
#define	XFS_IOMAP_WRITE_NOSPACE	7
#define	XFS_ITRUNC_START	8
#define	XFS_ITRUNC_FINISH1	9
#define	XFS_ITRUNC_FINISH2	10
#define	XFS_CTRUNC1		11
#define	XFS_CTRUNC2		12
#define	XFS_CTRUNC3		13
#define	XFS_CTRUNC4		14
#define	XFS_CTRUNC5		15
#define	XFS_CTRUNC6		16
#define	XFS_BUNMAP		17
#define	XFS_INVAL_CACHED	18
#define	XFS_DIORD_ENTER		19
#define	XFS_DIOWR_ENTER		20
#define	XFS_WRITEPAGE_ENTER	22
#define	XFS_RELEASEPAGE_ENTER	23
#define	XFS_INVALIDPAGE_ENTER	24
#define	XFS_IOMAP_ALLOC_ENTER	25
#define	XFS_IOMAP_ALLOC_MAP	26
#define	XFS_IOMAP_UNWRITTEN	27
#define XFS_SPLICE_READ_ENTER	28
#define XFS_SPLICE_WRITE_ENTER	29
extern void xfs_rw_enter_trace(int, struct xfs_iocore *,
				void *, size_t, loff_t, int);
extern void xfs_inval_cached_trace(struct xfs_iocore *,
				xfs_off_t, xfs_off_t, xfs_off_t, xfs_off_t);
#else
#define xfs_rw_enter_trace(tag, io, data, size, offset, ioflags)
#define xfs_inval_cached_trace(io, offset, len, first, last)
#endif

extern int xfsbdstrat(struct xfs_mount *, struct xfs_buf *);
extern int xfs_bdstrat_cb(struct xfs_buf *);
extern int xfs_dev_is_read_only(struct xfs_mount *, char *);

extern int xfs_zero_eof(struct inode *, struct xfs_iocore *, xfs_off_t,
				xfs_fsize_t);

#endif	/* __XFS_LRW_H__ */