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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) 2004 Mellanox Technologies Ltd.  All rights reserved.
 * Copyright (c) 2004 Infinicon Corporation.  All rights reserved.
 * Copyright (c) 2004 Intel Corporation.  All rights reserved.
 * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
 * Copyright (c) 2004 Voltaire Corporation.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * $Id: ib_smi.h,v 1.13 2007/09/12 17:09:56 tes.longdrop.melbourne.sgi.com Exp $
 */

#if !defined( IB_SMI_H )
#define IB_SMI_H

#include <rdma/ib_mad.h>

#define IB_SMP_DATA_SIZE			64
#define IB_SMP_MAX_PATH_HOPS			64

struct ib_smp {
	u8	base_version;
	u8	mgmt_class;
	u8	class_version;
	u8	method;
	__be16	status;
	u8	hop_ptr;
	u8	hop_cnt;
	__be64	tid;
	__be16	attr_id;
	__be16	resv;
	__be32	attr_mod;
	__be64	mkey;
	__be16	dr_slid;
	__be16	dr_dlid;
	u8	reserved[28];
	u8	data[IB_SMP_DATA_SIZE];
	u8	initial_path[IB_SMP_MAX_PATH_HOPS];
	u8	return_path[IB_SMP_MAX_PATH_HOPS];
} __attribute__ ((packed));

#define IB_SMP_DIRECTION			__constant_htons(0x8000)

/* Subnet management attributes */
#define IB_SMP_ATTR_NOTICE			__constant_htons(0x0002)
#define IB_SMP_ATTR_NODE_DESC			__constant_htons(0x0010)
#define IB_SMP_ATTR_NODE_INFO			__constant_htons(0x0011)
#define IB_SMP_ATTR_SWITCH_INFO			__constant_htons(0x0012)
#define IB_SMP_ATTR_GUID_INFO			__constant_htons(0x0014)
#define IB_SMP_ATTR_PORT_INFO			__constant_htons(0x0015)
#define IB_SMP_ATTR_PKEY_TABLE			__constant_htons(0x0016)
#define IB_SMP_ATTR_SL_TO_VL_TABLE		__constant_htons(0x0017)
#define IB_SMP_ATTR_VL_ARB_TABLE		__constant_htons(0x0018)
#define IB_SMP_ATTR_LINEAR_FORWARD_TABLE	__constant_htons(0x0019)
#define IB_SMP_ATTR_RANDOM_FORWARD_TABLE	__constant_htons(0x001A)
#define IB_SMP_ATTR_MCAST_FORWARD_TABLE		__constant_htons(0x001B)
#define IB_SMP_ATTR_SM_INFO			__constant_htons(0x0020)
#define IB_SMP_ATTR_VENDOR_DIAG			__constant_htons(0x0030)
#define IB_SMP_ATTR_LED_INFO			__constant_htons(0x0031)
#define IB_SMP_ATTR_VENDOR_MASK			__constant_htons(0xFF00)

struct ib_port_info {
	__be64 mkey;
	__be64 gid_prefix;
	__be16 lid;
	__be16 sm_lid;
	__be32 cap_mask;
	__be16 diag_code;
	__be16 mkey_lease_period;
	u8 local_port_num;
	u8 link_width_enabled;
	u8 link_width_supported;
	u8 link_width_active;
	u8 linkspeed_portstate;			/* 4 bits, 4 bits */
	u8 portphysstate_linkdown;		/* 4 bits, 4 bits */
	u8 mkeyprot_resv_lmc;			/* 2 bits, 3, 3 */
	u8 linkspeedactive_enabled;		/* 4 bits, 4 bits */
	u8 neighbormtu_mastersmsl;		/* 4 bits, 4 bits */
	u8 vlcap_inittype;			/* 4 bits, 4 bits */
	u8 vl_high_limit;
	u8 vl_arb_high_cap;
	u8 vl_arb_low_cap;
	u8 inittypereply_mtucap;		/* 4 bits, 4 bits */
	u8 vlstallcnt_hoqlife;			/* 3 bits, 5 bits */
	u8 operationalvl_pei_peo_fpi_fpo;	/* 4 bits, 1, 1, 1, 1 */
	__be16 mkey_violations;
	__be16 pkey_violations;
	__be16 qkey_violations;
	u8 guid_cap;
	u8 clientrereg_resv_subnetto;		/* 1 bit, 2 bits, 5 */
	u8 resv_resptimevalue;			/* 3 bits, 5 bits */
	u8 localphyerrors_overrunerrors;	/* 4 bits, 4 bits */
	__be16 max_credit_hint;
	u8 resv;
	u8 link_roundtrip_latency[3];
};

static inline u8
ib_get_smp_direction(struct ib_smp *smp)
{
	return ((smp->status & IB_SMP_DIRECTION) == IB_SMP_DIRECTION);
}

#endif /* IB_SMI_H */