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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.

/*
 * linux/include/linux/edd.h
 *  Copyright (C) 2002, 2003, 2004 Dell Inc.
 *  by Matt Domsch <Matt_Domsch@dell.com>
 *
 * structures and definitions for the int 13h, ax={41,48}h
 * BIOS Enhanced Disk Drive Services
 * This is based on the T13 group document D1572 Revision 0 (August 14 2002)
 * available at http://www.t13.org/docs2002/d1572r0.pdf.  It is
 * very similar to D1484 Revision 3 http://www.t13.org/docs2002/d1484r3.pdf
 *
 * In a nutshell, arch/{i386,x86_64}/boot/setup.S populates a scratch
 * table in the boot_params that contains a list of BIOS-enumerated
 * boot devices.
 * In arch/{i386,x86_64}/kernel/setup.c, this information is
 * transferred into the edd structure, and in drivers/firmware/edd.c, that
 * information is used to identify BIOS boot disk.  The code in setup.S
 * is very sensitive to the size of these structures.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License v2.0 as published by
 * the Free Software Foundation
 *
 * 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.
 *
 */
#ifndef _LINUX_EDD_H
#define _LINUX_EDD_H

#define EDDNR 0x1e9		/* addr of number of edd_info structs at EDDBUF
				   in boot_params - treat this as 1 byte  */
#define EDDBUF	0xd00		/* addr of edd_info structs in boot_params */
#define EDDMAXNR 6		/* number of edd_info structs starting at EDDBUF  */
#define EDDEXTSIZE 8		/* change these if you muck with the structures */
#define EDDPARMSIZE 74
#define CHECKEXTENSIONSPRESENT 0x41
#define GETDEVICEPARAMETERS 0x48
#define LEGACYGETDEVICEPARAMETERS 0x08
#define EDDMAGIC1 0x55AA
#define EDDMAGIC2 0xAA55


#define READ_SECTORS 0x02         /* int13 AH=0x02 is READ_SECTORS command */
#define EDD_MBR_SIG_OFFSET 0x1B8  /* offset of signature in the MBR */
#define EDD_MBR_SIG_BUF    0x290  /* addr in boot params */
#define EDD_MBR_SIG_MAX 16        /* max number of signatures to store */
#define EDD_MBR_SIG_NR_BUF 0x1ea  /* addr of number of MBR signtaures at EDD_MBR_SIG_BUF
				     in boot_params - treat this as 1 byte  */

#ifndef __ASSEMBLY__

#define EDD_EXT_FIXED_DISK_ACCESS           (1 << 0)
#define EDD_EXT_DEVICE_LOCKING_AND_EJECTING (1 << 1)
#define EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT (1 << 2)
#define EDD_EXT_64BIT_EXTENSIONS            (1 << 3)

#define EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT (1 << 0)
#define EDD_INFO_GEOMETRY_VALID                (1 << 1)
#define EDD_INFO_REMOVABLE                     (1 << 2)
#define EDD_INFO_WRITE_VERIFY                  (1 << 3)
#define EDD_INFO_MEDIA_CHANGE_NOTIFICATION     (1 << 4)
#define EDD_INFO_LOCKABLE                      (1 << 5)
#define EDD_INFO_NO_MEDIA_PRESENT              (1 << 6)
#define EDD_INFO_USE_INT13_FN50                (1 << 7)

struct edd_device_params {
	u16 length;
	u16 info_flags;
	u32 num_default_cylinders;
	u32 num_default_heads;
	u32 sectors_per_track;
	u64 number_of_sectors;
	u16 bytes_per_sector;
	u32 dpte_ptr;		/* 0xFFFFFFFF for our purposes */
	u16 key;		/* = 0xBEDD */
	u8 device_path_info_length;	/* = 44 */
	u8 reserved2;
	u16 reserved3;
	u8 host_bus_type[4];
	u8 interface_type[8];
	union {
		struct {
			u16 base_address;
			u16 reserved1;
			u32 reserved2;
		} __attribute__ ((packed)) isa;
		struct {
			u8 bus;
			u8 slot;
			u8 function;
			u8 channel;
			u32 reserved;
		} __attribute__ ((packed)) pci;
		/* pcix is same as pci */
		struct {
			u64 reserved;
		} __attribute__ ((packed)) ibnd;
		struct {
			u64 reserved;
		} __attribute__ ((packed)) xprs;
		struct {
			u64 reserved;
		} __attribute__ ((packed)) htpt;
		struct {
			u64 reserved;
		} __attribute__ ((packed)) unknown;
	} interface_path;
	union {
		struct {
			u8 device;
			u8 reserved1;
			u16 reserved2;
			u32 reserved3;
			u64 reserved4;
		} __attribute__ ((packed)) ata;
		struct {
			u8 device;
			u8 lun;
			u8 reserved1;
			u8 reserved2;
			u32 reserved3;
			u64 reserved4;
		} __attribute__ ((packed)) atapi;
		struct {
			u16 id;
			u64 lun;
			u16 reserved1;
			u32 reserved2;
		} __attribute__ ((packed)) scsi;
		struct {
			u64 serial_number;
			u64 reserved;
		} __attribute__ ((packed)) usb;
		struct {
			u64 eui;
			u64 reserved;
		} __attribute__ ((packed)) i1394;
		struct {
			u64 wwid;
			u64 lun;
		} __attribute__ ((packed)) fibre;
		struct {
			u64 identity_tag;
			u64 reserved;
		} __attribute__ ((packed)) i2o;
		struct {
			u32 array_number;
			u32 reserved1;
			u64 reserved2;
		} __attribute__ ((packed)) raid;
		struct {
			u8 device;
			u8 reserved1;
			u16 reserved2;
			u32 reserved3;
			u64 reserved4;
		} __attribute__ ((packed)) sata;
		struct {
			u64 reserved1;
			u64 reserved2;
		} __attribute__ ((packed)) unknown;
	} device_path;
	u8 reserved4;
	u8 checksum;
} __attribute__ ((packed));

struct edd_info {
	u8 device;
	u8 version;
	u16 interface_support;
	u16 legacy_max_cylinder;
	u8 legacy_max_head;
	u8 legacy_sectors_per_track;
	struct edd_device_params params;
} __attribute__ ((packed));

struct edd {
	unsigned int mbr_signature[EDD_MBR_SIG_MAX];
	struct edd_info edd_info[EDDMAXNR];
	unsigned char mbr_signature_nr;
	unsigned char edd_info_nr;
};

extern struct edd edd;

#endif				/*!__ASSEMBLY__ */

#endif				/* _LINUX_EDD_H */