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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:

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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/sunrpc/auth_gss.h
 *
 * Declarations for RPCSEC_GSS
 *
 * Dug Song <dugsong@monkey.org>
 * Andy Adamson <andros@umich.edu>
 * Bruce Fields <bfields@umich.edu>
 * Copyright (c) 2000 The Regents of the University of Michigan
 *
 * $Id$
 */

#ifndef _LINUX_SUNRPC_AUTH_GSS_H
#define _LINUX_SUNRPC_AUTH_GSS_H

#ifdef __KERNEL__
#include <linux/sunrpc/auth.h>
#include <linux/sunrpc/svc.h>
#include <linux/sunrpc/gss_api.h>

#define RPC_GSS_VERSION		1

#define MAXSEQ 0x80000000 /* maximum legal sequence number, from rfc 2203 */

enum rpc_gss_proc {
	RPC_GSS_PROC_DATA = 0,
	RPC_GSS_PROC_INIT = 1,
	RPC_GSS_PROC_CONTINUE_INIT = 2,
	RPC_GSS_PROC_DESTROY = 3
};

enum rpc_gss_svc {
	RPC_GSS_SVC_NONE = 1,
	RPC_GSS_SVC_INTEGRITY = 2,
	RPC_GSS_SVC_PRIVACY = 3
};

/* on-the-wire gss cred: */
struct rpc_gss_wire_cred {
	u32			gc_v;		/* version */
	u32			gc_proc;	/* control procedure */
	u32			gc_seq;		/* sequence number */
	u32			gc_svc;		/* service */
	struct xdr_netobj	gc_ctx;		/* context handle */
};

/* on-the-wire gss verifier: */
struct rpc_gss_wire_verf {
	u32			gv_flavor;
	struct xdr_netobj	gv_verf;
};

/* return from gss NULL PROC init sec context */
struct rpc_gss_init_res {
	struct xdr_netobj	gr_ctx;		/* context handle */
	u32			gr_major;	/* major status */
	u32			gr_minor;	/* minor status */
	u32			gr_win;		/* sequence window */
	struct xdr_netobj	gr_token;	/* token */
};

/* The gss_cl_ctx struct holds all the information the rpcsec_gss client
 * code needs to know about a single security context.  In particular,
 * gc_gss_ctx is the context handle that is used to do gss-api calls, while
 * gc_wire_ctx is the context handle that is used to identify the context on
 * the wire when communicating with a server. */

struct gss_cl_ctx {
	atomic_t		count;
	enum rpc_gss_proc	gc_proc;
	u32			gc_seq;
	spinlock_t		gc_seq_lock;
	struct gss_ctx		*gc_gss_ctx;
	struct xdr_netobj	gc_wire_ctx;
	u32			gc_win;
	unsigned long		gc_expiry;
	struct rcu_head		gc_rcu;
};

struct gss_upcall_msg;
struct gss_cred {
	struct rpc_cred		gc_base;
	enum rpc_gss_svc	gc_service;
	struct gss_cl_ctx	*gc_ctx;
	struct gss_upcall_msg	*gc_upcall;
};

#endif /* __KERNEL__ */
#endif /* _LINUX_SUNRPC_AUTH_GSS_H */