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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.

/* Header file for all dibusb-based-receivers.
 *
 * Copyright (C) 2004-5 Patrick Boettcher (patrick.boettcher@desy.de)
 *
 *	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, version 2.
 *
 * see Documentation/dvb/README.dvb-usb for more information
 */
#ifndef _DVB_USB_DIBUSB_H_
#define _DVB_USB_DIBUSB_H_

#ifndef DVB_USB_LOG_PREFIX
 #define DVB_USB_LOG_PREFIX "dibusb"
#endif
#include "dvb-usb.h"

#include "dib3000.h"
#include "dib3000mc.h"
#include "mt2060.h"

/*
 * protocol of all dibusb related devices
 */

/*
 * bulk msg to/from endpoint 0x01
 *
 * general structure:
 * request_byte parameter_bytes
 */

#define DIBUSB_REQ_START_READ			0x00
#define DIBUSB_REQ_START_DEMOD			0x01

/*
 * i2c read
 * bulk write: 0x02 ((7bit i2c_addr << 1) & 0x01) register_bytes length_word
 * bulk read:  byte_buffer (length_word bytes)
 */
#define DIBUSB_REQ_I2C_READ			0x02

/*
 * i2c write
 * bulk write: 0x03 (7bit i2c_addr << 1) register_bytes value_bytes
 */
#define DIBUSB_REQ_I2C_WRITE			0x03

/*
 * polling the value of the remote control
 * bulk write: 0x04
 * bulk read:  byte_buffer (5 bytes)
 */
#define DIBUSB_REQ_POLL_REMOTE       0x04

/* additional status values for Hauppauge Remote Control Protocol */
#define DIBUSB_RC_HAUPPAUGE_KEY_PRESSED	0x01
#define DIBUSB_RC_HAUPPAUGE_KEY_EMPTY	0x03

/* streaming mode:
 * bulk write: 0x05 mode_byte
 *
 * mode_byte is mostly 0x00
 */
#define DIBUSB_REQ_SET_STREAMING_MODE	0x05

/* interrupt the internal read loop, when blocking */
#define DIBUSB_REQ_INTR_READ			0x06

/* io control
 * 0x07 cmd_byte param_bytes
 *
 * param_bytes can be up to 32 bytes
 *
 * cmd_byte function    parameter name
 * 0x00     power mode
 *                      0x00      sleep
 *                      0x01      wakeup
 *
 * 0x01     enable streaming
 * 0x02     disable streaming
 *
 *
 */
#define DIBUSB_REQ_SET_IOCTL			0x07

/* IOCTL commands */

/* change the power mode in firmware */
#define DIBUSB_IOCTL_CMD_POWER_MODE		0x00
#define DIBUSB_IOCTL_POWER_SLEEP			0x00
#define DIBUSB_IOCTL_POWER_WAKEUP			0x01

/* modify streaming of the FX2 */
#define DIBUSB_IOCTL_CMD_ENABLE_STREAM	0x01
#define DIBUSB_IOCTL_CMD_DISABLE_STREAM	0x02

struct dibusb_state {
	struct dib_fe_xfer_ops ops;
	int mt2060_present;
	u8 tuner_addr;
};

struct dibusb_device_state {
	/* for RC5 remote control */
	int old_toggle;
	int last_repeat_count;
};

extern struct i2c_algorithm dibusb_i2c_algo;

extern int dibusb_dib3000mc_frontend_attach(struct dvb_usb_adapter *);
extern int dibusb_dib3000mc_tuner_attach (struct dvb_usb_adapter *);

extern int dibusb_streaming_ctrl(struct dvb_usb_adapter *, int);
extern int dibusb_pid_filter(struct dvb_usb_adapter *, int, u16, int);
extern int dibusb_pid_filter_ctrl(struct dvb_usb_adapter *, int);
extern int dibusb2_0_streaming_ctrl(struct dvb_usb_adapter *, int);

extern int dibusb_power_ctrl(struct dvb_usb_device *, int);
extern int dibusb2_0_power_ctrl(struct dvb_usb_device *, int);

#define DEFAULT_RC_INTERVAL 150
//#define DEFAULT_RC_INTERVAL 100000

extern struct dvb_usb_rc_key dibusb_rc_keys[];
extern int dibusb_rc_query(struct dvb_usb_device *, u32 *, int *);
extern int dibusb_read_eeprom_byte(struct dvb_usb_device *, u8, u8 *);

#endif