1/*
 2 * Copyright (c) 2000,2005 Silicon Graphics, Inc.
 3 * All Rights Reserved.
 4 *
 5 * This program is free software; you can redistribute it and/or
 6 * modify it under the terms of the GNU General Public License as
 7 * published by the Free Software Foundation.
 8 *
 9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
17 */
18#ifndef __XFS_ALLOC_BTREE_H__
19#define	__XFS_ALLOC_BTREE_H__
20
21/*
22 * Freespace on-disk structures
23 */
24
25struct xfs_buf;
26struct xfs_btree_cur;
27struct xfs_mount;
28
29/*
30 * Btree block header size depends on a superblock flag.
31 */
32#define XFS_ALLOC_BLOCK_LEN(mp) \
33	(xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
34		XFS_BTREE_SBLOCK_CRC_LEN : XFS_BTREE_SBLOCK_LEN)
35
36/*
37 * Record, key, and pointer address macros for btree blocks.
38 *
39 * (note that some of these may appear unused, but they are used in userspace)
40 */
41#define XFS_ALLOC_REC_ADDR(mp, block, index) \
42	((xfs_alloc_rec_t *) \
43		((char *)(block) + \
44		 XFS_ALLOC_BLOCK_LEN(mp) + \
45		 (((index) - 1) * sizeof(xfs_alloc_rec_t))))
46
47#define XFS_ALLOC_KEY_ADDR(mp, block, index) \
48	((xfs_alloc_key_t *) \
49		((char *)(block) + \
50		 XFS_ALLOC_BLOCK_LEN(mp) + \
51		 ((index) - 1) * sizeof(xfs_alloc_key_t)))
52
53#define XFS_ALLOC_PTR_ADDR(mp, block, index, maxrecs) \
54	((xfs_alloc_ptr_t *) \
55		((char *)(block) + \
56		 XFS_ALLOC_BLOCK_LEN(mp) + \
57		 (maxrecs) * sizeof(xfs_alloc_key_t) + \
58		 ((index) - 1) * sizeof(xfs_alloc_ptr_t)))
59
60extern struct xfs_btree_cur *xfs_allocbt_init_cursor(struct xfs_mount *,
61		struct xfs_trans *, struct xfs_buf *,
62		xfs_agnumber_t, xfs_btnum_t);
63extern int xfs_allocbt_maxrecs(struct xfs_mount *, int, int);
64
65#endif	/* __XFS_ALLOC_BTREE_H__ */