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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 __CODA_PSDEV_H
#define __CODA_PSDEV_H

#include <linux/magic.h>

#define CODA_PSDEV_MAJOR 67
#define MAX_CODADEVS  5	   /* how many do we allow */

struct kstatfs;

/* communication pending/processing queues */
struct venus_comm {
	u_long		    vc_seq;
	wait_queue_head_t   vc_waitq; /* Venus wait queue */
	struct list_head    vc_pending;
	struct list_head    vc_processing;
	int                 vc_inuse;
	struct super_block *vc_sb;
};


static inline struct venus_comm *coda_vcp(struct super_block *sb)
{
	return (struct venus_comm *)((sb)->s_fs_info);
}


/* upcalls */
int venus_rootfid(struct super_block *sb, struct CodaFid *fidp);
int venus_getattr(struct super_block *sb, struct CodaFid *fid,
		  struct coda_vattr *attr);
int venus_setattr(struct super_block *, struct CodaFid *, struct coda_vattr *);
int venus_lookup(struct super_block *sb, struct CodaFid *fid, 
		 const char *name, int length, int *type, 
		 struct CodaFid *resfid);
int venus_close(struct super_block *sb, struct CodaFid *fid, int flags,
		vuid_t uid);
int venus_open(struct super_block *sb, struct CodaFid *fid, int flags,
	       struct file **f);
int venus_mkdir(struct super_block *sb, struct CodaFid *dirfid, 
		const char *name, int length, 
		struct CodaFid *newfid, struct coda_vattr *attrs);
int venus_create(struct super_block *sb, struct CodaFid *dirfid, 
		 const char *name, int length, int excl, int mode,
		 struct CodaFid *newfid, struct coda_vattr *attrs) ;
int venus_rmdir(struct super_block *sb, struct CodaFid *dirfid, 
		const char *name, int length);
int venus_remove(struct super_block *sb, struct CodaFid *dirfid, 
		 const char *name, int length);
int venus_readlink(struct super_block *sb, struct CodaFid *fid, 
		   char *buffer, int *length);
int venus_rename(struct super_block *, struct CodaFid *new_fid, 
		 struct CodaFid *old_fid, size_t old_length, 
		 size_t new_length, const char *old_name, 
		 const char *new_name);
int venus_link(struct super_block *sb, struct CodaFid *fid, 
		  struct CodaFid *dirfid, const char *name, int len );
int venus_symlink(struct super_block *sb, struct CodaFid *fid,
		  const char *name, int len, const char *symname, int symlen);
int venus_access(struct super_block *sb, struct CodaFid *fid, int mask);
int venus_pioctl(struct super_block *sb, struct CodaFid *fid,
		 unsigned int cmd, struct PioctlData *data);
int coda_downcall(int opcode, union outputArgs *out, struct super_block *sb);
int venus_fsync(struct super_block *sb, struct CodaFid *fid);
int venus_statfs(struct dentry *dentry, struct kstatfs *sfs);


/* messages between coda filesystem in kernel and Venus */
struct upc_req {
	struct list_head    uc_chain;
	caddr_t	            uc_data;
	u_short	            uc_flags;
	u_short             uc_inSize;  /* Size is at most 5000 bytes */
	u_short	            uc_outSize;
	u_short	            uc_opcode;  /* copied from data to save lookup */
	int		    uc_unique;
	wait_queue_head_t   uc_sleep;   /* process' wait queue */
};

#define REQ_ASYNC  0x1
#define REQ_READ   0x2
#define REQ_WRITE  0x4
#define REQ_ABORT  0x8


/*
 * Statistics
 */

extern struct venus_comm coda_comms[];

#endif