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jfs_btree.h

/*
 *   Copyright (c) International Business Machines Corp., 2000-2002
 *
 *   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 to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
#ifndef     _H_JFS_BTREE
#define _H_JFS_BTREE
/*
 *    jfs_btree.h: B+-tree
 *
 * JFS B+-tree (dtree and xtree) common definitions
 */

/*
 *    basic btree page - btpage
 */
struct btpage {
      int64_t next;            /* 8: right sibling bn */
      int64_t prev;            /* 8: left sibling bn */

      uint8_t flag;           /* 1: */
      uint8_t rsrvd[7]; /* 7: type specific */
      int64_t self;           /* 8: self address */

      uint8_t entry[4064];    /* 4064: */
};                      /* (4096) */

/* btpage flag */
#define BT_TYPE       0x07    /* B+-tree index */
#define     BT_ROOT       0x01      /* root page */
#define     BT_LEAF       0x02      /* leaf page */
#define     BT_INTERNAL   0x04      /* internal page */
#define     BT_RIGHTMOST  0x10      /* rightmost page */
#define     BT_LEFTMOST   0x20      /* leftmost page */
#define     BT_SWAPPED    0x80      /* endian swapped when read from disk */

#endif                        /* _H_JFS_BTREE */

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