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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.

/* 
   HCI USB driver for Linux Bluetooth protocol stack (BlueZ)
   Copyright (C) 2000-2001 Qualcomm Incorporated
   Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>

   Copyright (C) 2003 Maxim Krasnyansky <maxk@qualcomm.com>

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License version 2 as
   published by the Free Software Foundation;

   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 OF THIRD PARTY RIGHTS.
   IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
   CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES 
   WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 
   ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 
   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

   ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, 
   COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS 
   SOFTWARE IS DISCLAIMED.
*/

/* Class, SubClass, and Protocol codes that describe a Bluetooth device */
#define HCI_DEV_CLASS		0xe0	/* Wireless class */
#define HCI_DEV_SUBCLASS	0x01	/* RF subclass */
#define HCI_DEV_PROTOCOL	0x01	/* Bluetooth programming protocol */

#define HCI_IGNORE		0x01
#define HCI_RESET		0x02
#define HCI_DIGIANSWER		0x04
#define HCI_CSR			0x08
#define HCI_SNIFFER		0x10
#define HCI_BCM92035		0x20
#define HCI_BROKEN_ISOC		0x40
#define HCI_WRONG_SCO_MTU	0x80

#define HCI_MAX_IFACE_NUM	3

#define HCI_MAX_BULK_TX		4
#define HCI_MAX_BULK_RX		1

#define HCI_MAX_ISOC_RX		2
#define HCI_MAX_ISOC_TX		2

#define HCI_MAX_ISOC_FRAMES	10

struct _urb_queue {
	struct list_head head;
	spinlock_t       lock;
};

struct _urb {
	struct list_head  list;
	struct _urb_queue *queue;
	int               type;
	void              *priv;
	struct urb        urb;
};

static inline void _urb_free(struct _urb *_urb)
{
	kfree(_urb);
}

static inline void _urb_queue_init(struct _urb_queue *q)
{
	INIT_LIST_HEAD(&q->head);
	spin_lock_init(&q->lock);
}

static inline void _urb_queue_head(struct _urb_queue *q, struct _urb *_urb)
{
	unsigned long flags;
	spin_lock_irqsave(&q->lock, flags);
	list_add(&_urb->list, &q->head); _urb->queue = q;
	spin_unlock_irqrestore(&q->lock, flags);
}

static inline void _urb_queue_tail(struct _urb_queue *q, struct _urb *_urb)
{
	unsigned long flags;
	spin_lock_irqsave(&q->lock, flags);
	list_add_tail(&_urb->list, &q->head); _urb->queue = q;
	spin_unlock_irqrestore(&q->lock, flags);
}

static inline void _urb_unlink(struct _urb *_urb)
{
	struct _urb_queue *q = _urb->queue;
	unsigned long flags;
	if (q) {
		spin_lock_irqsave(&q->lock, flags);
		list_del(&_urb->list); _urb->queue = NULL;
		spin_unlock_irqrestore(&q->lock, flags);
	}
}

struct hci_usb {
	struct hci_dev		*hdev;

	unsigned long		state;

	struct usb_device	*udev;

	struct usb_host_endpoint	*bulk_in_ep;
	struct usb_host_endpoint	*bulk_out_ep;
	struct usb_host_endpoint	*intr_in_ep;

	struct usb_interface		*isoc_iface;
	struct usb_host_endpoint	*isoc_out_ep;
	struct usb_host_endpoint	*isoc_in_ep;

	__u8			ctrl_req;

	struct sk_buff_head	transmit_q[4];

	rwlock_t		completion_lock;

	atomic_t		pending_tx[4];		/* Number of pending requests */
	struct _urb_queue	pending_q[4];		/* Pending requests */
	struct _urb_queue	completed_q[4];		/* Completed requests */
};

/* States  */
#define HCI_USB_TX_PROCESS	1
#define HCI_USB_TX_WAKEUP	2