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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 _FS_XFS_DIR2_LEAF_H
#define	_FS_XFS_DIR2_LEAF_H

#ident "$Revision: 1.1 $"

/*
 * xfs_dir2_leaf.h
 * Directory version 2, leaf block structures.
 */

struct dirent;
struct uio;
struct xfs_dabuf;
struct xfs_da_args;
struct xfs_inode;
struct xfs_mount;
struct xfs_trans;

/*
 * Constants.
 */

/*
 * Offset of the leaf/node space.  First block in this space
 * is the btree root.
 */
#define	XFS_DIR2_LEAF_SPACE	1
#define	XFS_DIR2_LEAF_OFFSET	(XFS_DIR2_LEAF_SPACE * XFS_DIR2_SPACE_SIZE)
#define	XFS_DIR2_LEAF_FIRSTDB(mp)	\
	XFS_DIR2_BYTE_TO_DB(mp, XFS_DIR2_LEAF_OFFSET)

/*
 * Types.
 */

/*
 * Offset in data space of a data entry.
 */
typedef	__uint32_t	xfs_dir2_dataptr_t;
#define	XFS_DIR2_MAX_DATAPTR	((xfs_dir2_dataptr_t)0xffffffff)
#define	XFS_DIR2_NULL_DATAPTR	((xfs_dir2_dataptr_t)0)

/*
 * Structures.
 */

/*
 * Leaf block header.
 */
typedef struct xfs_dir2_leaf_hdr {
	xfs_da_blkinfo_t	info;		/* header for da routines */
	__uint16_t		count;		/* count of entries */
	__uint16_t		stale;		/* count of stale entries */
} xfs_dir2_leaf_hdr_t;

/*
 * Leaf block entry.
 */
typedef struct xfs_dir2_leaf_entry {
	xfs_dahash_t		hashval;	/* hash value of name */
	xfs_dir2_dataptr_t	address;	/* address of data entry */
} xfs_dir2_leaf_entry_t;

/*
 * Leaf block tail.
 */
typedef struct xfs_dir2_leaf_tail {
	__uint32_t		bestcount;
} xfs_dir2_leaf_tail_t;

/*
 * Leaf block.
 * bests and tail are at the end of the block for single-leaf only
 * (magic = XFS_DIR2_LEAF1_MAGIC not XFS_DIR2_LEAFN_MAGIC).
 */
typedef struct xfs_dir2_leaf {
	xfs_dir2_leaf_hdr_t	hdr;		/* leaf header */
	xfs_dir2_leaf_entry_t	ents[1];	/* entries */
						/* ... */
	xfs_dir2_data_off_t	bests[1];	/* best free counts */
	xfs_dir2_leaf_tail_t	tail;		/* leaf tail */
} xfs_dir2_leaf_t;

/*
 * Macros.
 * The DB blocks are logical directory block numbers, not filesystem blocks.
 */

#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_MAX_LEAF_ENTS)
int
xfs_dir2_max_leaf_ents(struct xfs_mount *mp);
#define	XFS_DIR2_MAX_LEAF_ENTS(mp)	\
	xfs_dir2_max_leaf_ents(mp)
#else
#define	XFS_DIR2_MAX_LEAF_ENTS(mp)	\
	((int)(((mp)->m_dirblksize - (uint)sizeof(xfs_dir2_leaf_hdr_t)) / \
	       (uint)sizeof(xfs_dir2_leaf_entry_t)))
#endif

/*
 * Get address of the bestcount field in the single-leaf block.
 */
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_LEAF_TAIL_P)
xfs_dir2_leaf_tail_t *
xfs_dir2_leaf_tail_p(struct xfs_mount *mp, xfs_dir2_leaf_t *lp);
#define	XFS_DIR2_LEAF_TAIL_P(mp,lp)	\
	xfs_dir2_leaf_tail_p(mp, lp)
#else
#define	XFS_DIR2_LEAF_TAIL_P(mp,lp)	\
	((xfs_dir2_leaf_tail_t *)\
	 ((char *)(lp) + (mp)->m_dirblksize - \
	  (uint)sizeof(xfs_dir2_leaf_tail_t)))
#endif

/*
 * Get address of the bests array in the single-leaf block.
 */
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_LEAF_BESTS_P)
xfs_dir2_data_off_t *
xfs_dir2_leaf_bests_p(xfs_dir2_leaf_tail_t *ltp);
#define	XFS_DIR2_LEAF_BESTS_P(ltp)	xfs_dir2_leaf_bests_p(ltp)
#else
#define	XFS_DIR2_LEAF_BESTS_P(ltp)	\
	((xfs_dir2_data_off_t *)(ltp) - (ltp)->bestcount)
#endif

/*
 * Convert dataptr to byte in file space
 */
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DATAPTR_TO_BYTE)
xfs_dir2_off_t
xfs_dir2_dataptr_to_byte(struct xfs_mount *mp, xfs_dir2_dataptr_t dp);
#define	XFS_DIR2_DATAPTR_TO_BYTE(mp,dp)	xfs_dir2_dataptr_to_byte(mp, dp)
#else
#define	XFS_DIR2_DATAPTR_TO_BYTE(mp,dp)	\
	((xfs_dir2_off_t)(dp) << XFS_DIR2_DATA_ALIGN_LOG)
#endif

/*
 * Convert byte in file space to dataptr.  It had better be aligned.
 */
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_BYTE_TO_DATAPTR)
xfs_dir2_dataptr_t
xfs_dir2_byte_to_dataptr(struct xfs_mount *mp, xfs_dir2_off_t by);
#define	XFS_DIR2_BYTE_TO_DATAPTR(mp,by)	xfs_dir2_byte_to_dataptr(mp,by)
#else
#define	XFS_DIR2_BYTE_TO_DATAPTR(mp,by)	\
	((xfs_dir2_dataptr_t)((by) >> XFS_DIR2_DATA_ALIGN_LOG))
#endif

/*
 * Convert dataptr to a block number
 */
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DATAPTR_TO_DB)
xfs_dir2_db_t
xfs_dir2_dataptr_to_db(struct xfs_mount *mp, xfs_dir2_dataptr_t dp);
#define	XFS_DIR2_DATAPTR_TO_DB(mp,dp)	xfs_dir2_dataptr_to_db(mp, dp)
#else
#define	XFS_DIR2_DATAPTR_TO_DB(mp,dp)	\
	XFS_DIR2_BYTE_TO_DB(mp, XFS_DIR2_DATAPTR_TO_BYTE(mp, dp))
#endif

/*
 * Convert dataptr to a byte offset in a block
 */
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DATAPTR_TO_OFF)
xfs_dir2_data_aoff_t
xfs_dir2_dataptr_to_off(struct xfs_mount *mp, xfs_dir2_dataptr_t dp);
#define	XFS_DIR2_DATAPTR_TO_OFF(mp,dp)	xfs_dir2_dataptr_to_off(mp, dp)
#else
#define	XFS_DIR2_DATAPTR_TO_OFF(mp,dp)	\
	XFS_DIR2_BYTE_TO_OFF(mp, XFS_DIR2_DATAPTR_TO_BYTE(mp, dp))
#endif

/*
 * Convert block and offset to byte in space
 */
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DB_OFF_TO_BYTE)
xfs_dir2_off_t
xfs_dir2_db_off_to_byte(struct xfs_mount *mp, xfs_dir2_db_t db,
			xfs_dir2_data_aoff_t o);
#define	XFS_DIR2_DB_OFF_TO_BYTE(mp,db,o)	\
	xfs_dir2_db_off_to_byte(mp, db, o)
#else
#define	XFS_DIR2_DB_OFF_TO_BYTE(mp,db,o)	\
	(((xfs_dir2_off_t)(db) << \
	 ((mp)->m_sb.sb_blocklog + (mp)->m_sb.sb_dirblklog)) + (o))
#endif

/*
 * Convert byte in space to (DB) block
 */
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_BYTE_TO_DB)
xfs_dir2_db_t xfs_dir2_byte_to_db(struct xfs_mount *mp, xfs_dir2_off_t by);
#define	XFS_DIR2_BYTE_TO_DB(mp,by)	xfs_dir2_byte_to_db(mp, by)
#else
#define	XFS_DIR2_BYTE_TO_DB(mp,by)	\
	((xfs_dir2_db_t)((by) >> \
			 ((mp)->m_sb.sb_blocklog + (mp)->m_sb.sb_dirblklog)))
#endif

/*
 * Convert byte in space to (DA) block
 */
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_BYTE_TO_DA)
xfs_dablk_t xfs_dir2_byte_to_da(struct xfs_mount *mp, xfs_dir2_off_t by);
#define	XFS_DIR2_BYTE_TO_DA(mp,by)	xfs_dir2_byte_to_da(mp, by)
#else
#define	XFS_DIR2_BYTE_TO_DA(mp,by)	\
	XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_BYTE_TO_DB(mp, by))
#endif

/*
 * Convert byte in space to offset in a block
 */
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_BYTE_TO_OFF)
xfs_dir2_data_aoff_t
xfs_dir2_byte_to_off(struct xfs_mount *mp, xfs_dir2_off_t by);
#define	XFS_DIR2_BYTE_TO_OFF(mp,by)	xfs_dir2_byte_to_off(mp, by)
#else
#define	XFS_DIR2_BYTE_TO_OFF(mp,by)	\
	((xfs_dir2_data_aoff_t)((by) & \
				((1 << ((mp)->m_sb.sb_blocklog + \
					(mp)->m_sb.sb_dirblklog)) - 1)))
#endif

/*
 * Convert block and offset to dataptr
 */
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DB_OFF_TO_DATAPTR)
xfs_dir2_dataptr_t
xfs_dir2_db_off_to_dataptr(struct xfs_mount *mp, xfs_dir2_db_t db,
			   xfs_dir2_data_aoff_t o);
#define	XFS_DIR2_DB_OFF_TO_DATAPTR(mp,db,o)	\
	xfs_dir2_db_off_to_dataptr(mp, db, o)
#else
#define	XFS_DIR2_DB_OFF_TO_DATAPTR(mp,db,o)	\
	XFS_DIR2_BYTE_TO_DATAPTR(mp, XFS_DIR2_DB_OFF_TO_BYTE(mp, db, o))
#endif

/*
 * Convert block (DB) to block (dablk)
 */
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DB_TO_DA)
xfs_dablk_t xfs_dir2_db_to_da(struct xfs_mount *mp, xfs_dir2_db_t db);
#define	XFS_DIR2_DB_TO_DA(mp,db)	xfs_dir2_db_to_da(mp, db)
#else
#define	XFS_DIR2_DB_TO_DA(mp,db)	\
	((xfs_dablk_t)((db) << (mp)->m_sb.sb_dirblklog))
#endif

/*
 * Convert block (dablk) to block (DB)
 */
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DA_TO_DB)
xfs_dir2_db_t xfs_dir2_da_to_db(struct xfs_mount *mp, xfs_dablk_t da);
#define	XFS_DIR2_DA_TO_DB(mp,da)	xfs_dir2_da_to_db(mp, da)
#else
#define	XFS_DIR2_DA_TO_DB(mp,da)	\
	((xfs_dir2_db_t)((da) >> (mp)->m_sb.sb_dirblklog))
#endif

/*
 * Convert block (dablk) to byte offset in space
 */
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DA_TO_BYTE)
xfs_dir2_off_t xfs_dir2_da_to_byte(struct xfs_mount *mp, xfs_dablk_t da);
#define XFS_DIR2_DA_TO_BYTE(mp,da)	xfs_dir2_da_to_byte(mp, da)
#else
#define	XFS_DIR2_DA_TO_BYTE(mp,da)	\
	XFS_DIR2_DB_OFF_TO_BYTE(mp, XFS_DIR2_DA_TO_DB(mp, da), 0)
#endif

/*
 * Function declarations.
 */

extern int
	xfs_dir2_block_to_leaf(struct xfs_da_args *args, struct xfs_dabuf *dbp);

extern int
	xfs_dir2_leaf_addname(struct xfs_da_args *args);

extern void
	xfs_dir2_leaf_compact(struct xfs_da_args *args, struct xfs_dabuf *bp);

extern void
	xfs_dir2_leaf_compact_x1(struct xfs_dabuf *bp, int *indexp,
				 int *lowstalep, int *highstalep, int *lowlogp,
				 int *highlogp);

#ifndef SIM
extern int
	xfs_dir2_leaf_getdents(struct xfs_trans *tp, struct xfs_inode *dp,
			       struct uio *uio, int *eofp, struct dirent *dbp,
			       xfs_dir2_put_t put);
#endif

extern int
	xfs_dir2_leaf_init(struct xfs_da_args *args, xfs_dir2_db_t bno,
			   struct xfs_dabuf **bpp, int magic);

extern void
	xfs_dir2_leaf_log_ents(struct xfs_trans *tp, struct xfs_dabuf *bp,
			       int first, int last);

extern void
	xfs_dir2_leaf_log_bests(struct xfs_trans *tp, struct xfs_dabuf *bp,
				int first, int last);

extern void
	xfs_dir2_leaf_log_header(struct xfs_trans *tp, struct xfs_dabuf *bp);

extern void
	xfs_dir2_leaf_log_tail(struct xfs_trans *tp, struct xfs_dabuf *bp);

extern int
	xfs_dir2_leaf_lookup(struct xfs_da_args *args);

#if defined(XFS_REPAIR_SIM) || !defined(SIM)
extern int
	xfs_dir2_leaf_removename(struct xfs_da_args *args);

extern int
	xfs_dir2_leaf_replace(struct xfs_da_args *args);
#endif /* XFS_REPAIR_SIM || !SIM */

extern int
	xfs_dir2_leaf_search_hash(struct xfs_da_args *args,
				  struct xfs_dabuf *lbp);
extern int
	xfs_dir2_leaf_trim_data(struct xfs_da_args *args, struct xfs_dabuf *lbp,				xfs_dir2_db_t db);

#if defined(XFS_REPAIR_SIM) || !defined(SIM)
extern int
	xfs_dir2_node_to_leaf(struct xfs_da_state *state);
#endif /* XFS_REPAIR_SIM || !SIM */

#endif	/* !_FS_XFS_DIR2_LEAF_H */