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streamline init/exit path

Currently the xfs module init/exit code is a mess.  It's farmed out
over a lot of function with very little error checking.  This patch
makes sure we propagate all initialization failures properly and clean
up after them.  Various runtime initializations are replaced with
compile-time initializations where possible to make this easier.  The
exit path is similarly consolidated.

There's now split out function to create/destroy the kmem zones and
alloc/free the trace buffers.  I've also changed the ktrace
allocations to KM_MAYFAIL and handled errors resulting from that.

And yes, we really should replace the XFS_*_TRACE ifdefs with a single
XFS_TRACE..

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Niv Sardi <xaiki@sgi.com>
Merge of xfs-linux-melb:xfs-kern:31354a by kenmcd.

/*
 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * 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.
 *
 * This program is distributed in the hope that it would 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef __XFS_SUPPORT_UUID_H__
#define __XFS_SUPPORT_UUID_H__

typedef struct {
	unsigned char	__u_bits[16];
} uuid_t;

extern void uuid_create_nil(uuid_t *uuid);
extern int uuid_is_nil(uuid_t *uuid);
extern int uuid_equal(uuid_t *uuid1, uuid_t *uuid2);
extern void uuid_getnodeuniq(uuid_t *uuid, int fsid [2]);
extern __uint64_t uuid_hash64(uuid_t *uuid);
extern int uuid_table_insert(uuid_t *uuid);
extern void uuid_table_remove(uuid_t *uuid);

#endif	/* __XFS_SUPPORT_UUID_H__ */