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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.

#ifndef __NET_RTNETLINK_H
#define __NET_RTNETLINK_H

#include <linux/rtnetlink.h>
#include <net/netlink.h>

typedef int (*rtnl_doit_func)(struct sk_buff *, struct nlmsghdr *, void *);
typedef int (*rtnl_dumpit_func)(struct sk_buff *, struct netlink_callback *);

extern int	__rtnl_register(int protocol, int msgtype,
				rtnl_doit_func, rtnl_dumpit_func);
extern void	rtnl_register(int protocol, int msgtype,
			      rtnl_doit_func, rtnl_dumpit_func);
extern int	rtnl_unregister(int protocol, int msgtype);
extern void	rtnl_unregister_all(int protocol);

static inline int rtnl_msg_family(struct nlmsghdr *nlh)
{
	if (nlmsg_len(nlh) >= sizeof(struct rtgenmsg))
		return ((struct rtgenmsg *) nlmsg_data(nlh))->rtgen_family;
	else
		return AF_UNSPEC;
}

/**
 *	struct rtnl_link_ops - rtnetlink link operations
 *
 *	@list: Used internally
 *	@kind: Identifier
 *	@maxtype: Highest device specific netlink attribute number
 *	@policy: Netlink policy for device specific attribute validation
 *	@validate: Optional validation function for netlink/changelink parameters
 *	@priv_size: sizeof net_device private space
 *	@setup: net_device setup function
 *	@newlink: Function for configuring and registering a new device
 *	@changelink: Function for changing parameters of an existing device
 *	@dellink: Function to remove a device
 *	@get_size: Function to calculate required room for dumping device
 *		   specific netlink attributes
 *	@fill_info: Function to dump device specific netlink attributes
 *	@get_xstats_size: Function to calculate required room for dumping devic
 *			  specific statistics
 *	@fill_xstats: Function to dump device specific statistics
 */
struct rtnl_link_ops {
	struct list_head	list;

	const char		*kind;

	size_t			priv_size;
	void			(*setup)(struct net_device *dev);

	int			maxtype;
	const struct nla_policy	*policy;
	int			(*validate)(struct nlattr *tb[],
					    struct nlattr *data[]);

	int			(*newlink)(struct net_device *dev,
					   struct nlattr *tb[],
					   struct nlattr *data[]);
	int			(*changelink)(struct net_device *dev,
					      struct nlattr *tb[],
					      struct nlattr *data[]);
	void			(*dellink)(struct net_device *dev);

	size_t			(*get_size)(const struct net_device *dev);
	int			(*fill_info)(struct sk_buff *skb,
					     const struct net_device *dev);

	size_t			(*get_xstats_size)(const struct net_device *dev);
	int			(*fill_xstats)(struct sk_buff *skb,
					       const struct net_device *dev);
};

extern int	__rtnl_link_register(struct rtnl_link_ops *ops);
extern void	__rtnl_link_unregister(struct rtnl_link_ops *ops);

extern int	rtnl_link_register(struct rtnl_link_ops *ops);
extern void	rtnl_link_unregister(struct rtnl_link_ops *ops);

#define MODULE_ALIAS_RTNL_LINK(kind) MODULE_ALIAS("rtnl-link-" kind)

#endif