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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.

/* ------------------------------------------------------------
 * ibmvscsi.h
 * (C) Copyright IBM Corporation 1994, 2003
 * Authors: Colin DeVilbiss (devilbis@us.ibm.com)
 *          Santiago Leon (santil@us.ibm.com)
 *          Dave Boutcher (sleddog@us.ibm.com)
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 * USA
 *
 * ------------------------------------------------------------
 * Emulation of a SCSI host adapter for Virtual I/O devices
 *
 * This driver allows the Linux SCSI peripheral drivers to directly
 * access devices in the hosting partition, either on an iSeries
 * hypervisor system or a converged hypervisor system.
 */
#ifndef IBMVSCSI_H
#define IBMVSCSI_H
#include <linux/types.h>
#include <linux/list.h>
#include <linux/completion.h>
#include <linux/interrupt.h>
#include "viosrp.h"

struct scsi_cmnd;
struct Scsi_Host;

/* Number of indirect bufs...the list of these has to fit in the
 * additional data of the srp_cmd struct along with the indirect
 * descriptor
 */
#define MAX_INDIRECT_BUFS 10

#define IBMVSCSI_MAX_REQUESTS_DEFAULT 100
#define IBMVSCSI_MAX_CMDS_PER_LUN 64

/* ------------------------------------------------------------
 * Data Structures
 */
/* an RPA command/response transport queue */
struct crq_queue {
	struct viosrp_crq *msgs;
	int size, cur;
	dma_addr_t msg_token;
	spinlock_t lock;
};

/* a unit of work for the hosting partition */
struct srp_event_struct {
	union viosrp_iu *xfer_iu;
	struct scsi_cmnd *cmnd;
	struct list_head list;
	void (*done) (struct srp_event_struct *);
	struct viosrp_crq crq;
	struct ibmvscsi_host_data *hostdata;
	atomic_t free;
	union viosrp_iu iu;
	void (*cmnd_done) (struct scsi_cmnd *);
	struct completion comp;
	struct timer_list timer;
	union viosrp_iu *sync_srp;
	struct srp_direct_buf *ext_list;
	dma_addr_t ext_list_token;
};

/* a pool of event structs for use */
struct event_pool {
	struct srp_event_struct *events;
	u32 size;
	int next;
	union viosrp_iu *iu_storage;
	dma_addr_t iu_token;
};

/* all driver data associated with a host adapter */
struct ibmvscsi_host_data {
	atomic_t request_limit;
	struct device *dev;
	struct event_pool pool;
	struct crq_queue queue;
	struct tasklet_struct srp_task;
	struct list_head sent;
	struct Scsi_Host *host;
	struct mad_adapter_info_data madapter_info;
};

/* routines for managing a command/response queue */
int ibmvscsi_init_crq_queue(struct crq_queue *queue,
			    struct ibmvscsi_host_data *hostdata,
			    int max_requests);
void ibmvscsi_release_crq_queue(struct crq_queue *queue,
				struct ibmvscsi_host_data *hostdata,
				int max_requests);
int ibmvscsi_reset_crq_queue(struct crq_queue *queue,
			      struct ibmvscsi_host_data *hostdata);

int ibmvscsi_reenable_crq_queue(struct crq_queue *queue,
				struct ibmvscsi_host_data *hostdata);

void ibmvscsi_handle_crq(struct viosrp_crq *crq,
			 struct ibmvscsi_host_data *hostdata);
int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata,
		      u64 word1, u64 word2);

#endif				/* IBMVSCSI_H */