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Encumbrance review done.
Add copyright and license words consistent with GPL.
Refer to http://fsg.melbourne.sgi.com/reviews/ for details.

There is a slight change in the license terms and conditions words
to go with the copyrights, so most of the files are not getting
new GPL's, just updated versions ... but there are 20-30 more files
here as well.

/*
 * Copyright (C) 1999 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; either version 2 of the License, or (at
 * your option) any later version.
 * 
 * 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.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 */
#ifndef	_XFS_LOG_H
#define _XFS_LOG_H

#ident	"$Revision: 1.41 $"

#ifdef __LITTLE_ENDIAN
/* Since the lsn comes out with the cycle number in the least significant
 * part of the lsn as a 64 bit quantity we need to do the comparison
 * of cycle and block numbers explicitly. On 32 bit machines this is
 * less code than a 64 bit compare anyway.
 */

#ifndef CYCLE_LSN
#define CYCLE_LSN(lsn)          (((uint *)&(lsn))[0])
#define BLOCK_LSN(lsn)          (((uint *)&(lsn))[1])
#define __REMOVE_CYCLE__
#endif

static inline xfs_lsn_t	_lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2)
{
	if (CYCLE_LSN(lsn1) != CYCLE_LSN(lsn2)) {
		return (CYCLE_LSN(lsn1) - CYCLE_LSN(lsn2));
	}

	return (BLOCK_LSN(lsn1) - BLOCK_LSN(lsn2));
}

#ifdef __REMOVE_CYCLE__
#undef CYCLE_LSN
#undef BLOCK_LSN
#endif

#define	XFS_LSN_CMP(x,y)	_lsn_cmp(x, y)
#define	XFS_LSN_DIFF(x,y)	_lsn_cmp(x, y)
#else
#define	XFS_LSN_CMP(x,y)	((x) - (y))
#define	XFS_LSN_DIFF(x,y)	((x) - (y))
#endif

/*
 * Macros, structures, prototypes for interface to the log manager.
 */

/*
 * Flags to xfs_log_mount
 */
#define XFS_LOG_RECOVER		0x1

/*
 * Flags to xfs_log_done()
 */
#define XFS_LOG_REL_PERM_RESERV	0x1


/*
 * Flags to xfs_log_reserve()
 *
 *	XFS_LOG_SLEEP:	 If space is not available, sleep (default)
 *	XFS_LOG_NOSLEEP: If space is not available, return error
 *	XFS_LOG_PERM_RESERV: Permanent reservation.  When writes are
 *		performed against this type of reservation, the reservation
 *		is not decreased.  Long running transactions should use this.
 */
#define XFS_LOG_SLEEP		0x0
#define XFS_LOG_NOSLEEP		0x1
#define XFS_LOG_PERM_RESERV	0x2
#define XFS_LOG_RESV_ALL	(XFS_LOG_NOSLEEP|XFS_LOG_PERM_RESERV)


/*
 * Flags to xfs_log_force()
 *
 *	XFS_LOG_SYNC:	Synchronous force in-core log to disk
 *	XFS_LOG_FORCE:	Start in-core log write now.
 *	XFS_LOG_URGE:	Start write within some window of time.
 *
 * Note: Either XFS_LOG_FORCE or XFS_LOG_URGE must be set.
 */
#define XFS_LOG_SYNC		0x1
#define XFS_LOG_FORCE		0x2
#define XFS_LOG_URGE		0x4


/*
 * Flags to xfs_log_print()
 *
 */
#define XFS_LOG_PRINT_EXIT	0x1
#define XFS_LOG_PRINT_NO_DATA	0x2
#define XFS_LOG_PRINT_NO_PRINT	0x4


/* Log Clients */
#define XFS_TRANSACTION		0x69
#define XFS_VOLUME		0x2
#define XFS_LOG			0xaa

typedef struct xfs_log_iovec {
	caddr_t		i_addr;		/* beginning address of region */
	int		i_len;		/* length in bytes of region */
} xfs_log_iovec_t;

typedef void* xfs_log_ticket_t;

/*
 * Structure used to pass callback function and the function's argument
 * to the log manager.
 */
typedef struct xfs_log_callback {
	struct xfs_log_callback	*cb_next;
	void			(*cb_func)(void *, int);
	void 			*cb_arg;
} xfs_log_callback_t;


/* Log manager interfaces */
struct xfs_mount;
xfs_lsn_t xfs_log_done(struct xfs_mount *mp,
		       xfs_log_ticket_t ticket,
		       uint		flags);
int	  xfs_log_force(struct xfs_mount *mp,
			xfs_lsn_t	 lsn,
			uint		 flags);
int	  xfs_log_init(void);
int	  xfs_log_mount(struct xfs_mount *mp,
			dev_t		 log_dev,
			daddr_t		 start_block,
			int		 num_bblocks);
int	  xfs_log_mount_finish(struct xfs_mount *mp, int);
void	  xfs_log_move_tail(struct xfs_mount	*mp,
			    xfs_lsn_t		tail_lsn);
void	  xfs_log_notify(struct xfs_mount	*mp,
			 xfs_lsn_t		lsn,
			 xfs_log_callback_t	*callback_entry);
int	  xfs_log_reserve(struct xfs_mount *mp,
			  int		   length,
			  int		   count,
			  xfs_log_ticket_t *ticket,
			  char		   clientid,
			  uint		   flags);
int	  xfs_log_write(struct xfs_mount *mp,
			xfs_log_iovec_t  region[],
			int		 nentries,
			xfs_log_ticket_t ticket,
			xfs_lsn_t	 *start_lsn);
int	  xfs_log_unmount(struct xfs_mount *mp);
int	  xfs_log_unmount_write(struct xfs_mount *mp);
void      xfs_log_unmount_dealloc(struct xfs_mount *mp);
int	  xfs_log_force_umount(struct xfs_mount *mp, int logerror);

/* Log manager utility interfaces */
void xfs_log_print(struct xfs_mount *mp,
		   dev_t	    log_dev,
		   daddr_t	    start_block,
		   int		    num_bblocks,
		   int		    start_print_block,
		   uint		    flags);


extern int xlog_debug;		/* set to 1 to enable real log */

extern int xfs_log_need_covered(struct xfs_mount *mp);

#endif	/* _XFS_LOG_H */