1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * Copyright (c) 2000,2005 Silicon Graphics, Inc.
 4 * All Rights Reserved.
 5 */
 6#ifndef __XFS_ALLOC_BTREE_H__
 7#define	__XFS_ALLOC_BTREE_H__
 8
 9/*
10 * Freespace on-disk structures
11 */
12
13struct xfs_buf;
14struct xfs_btree_cur;
15struct xfs_mount;
16
17/*
18 * Btree block header size depends on a superblock flag.
19 */
20#define XFS_ALLOC_BLOCK_LEN(mp) \
21	(xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
22		XFS_BTREE_SBLOCK_CRC_LEN : XFS_BTREE_SBLOCK_LEN)
23
24/*
25 * Record, key, and pointer address macros for btree blocks.
26 *
27 * (note that some of these may appear unused, but they are used in userspace)
28 */
29#define XFS_ALLOC_REC_ADDR(mp, block, index) \
30	((xfs_alloc_rec_t *) \
31		((char *)(block) + \
32		 XFS_ALLOC_BLOCK_LEN(mp) + \
33		 (((index) - 1) * sizeof(xfs_alloc_rec_t))))
34
35#define XFS_ALLOC_KEY_ADDR(mp, block, index) \
36	((xfs_alloc_key_t *) \
37		((char *)(block) + \
38		 XFS_ALLOC_BLOCK_LEN(mp) + \
39		 ((index) - 1) * sizeof(xfs_alloc_key_t)))
40
41#define XFS_ALLOC_PTR_ADDR(mp, block, index, maxrecs) \
42	((xfs_alloc_ptr_t *) \
43		((char *)(block) + \
44		 XFS_ALLOC_BLOCK_LEN(mp) + \
45		 (maxrecs) * sizeof(xfs_alloc_key_t) + \
46		 ((index) - 1) * sizeof(xfs_alloc_ptr_t)))
47
48extern struct xfs_btree_cur *xfs_allocbt_init_cursor(struct xfs_mount *,
49		struct xfs_trans *, struct xfs_buf *,
50		xfs_agnumber_t, xfs_btnum_t);
51extern int xfs_allocbt_maxrecs(struct xfs_mount *, int, int);
52extern xfs_extlen_t xfs_allocbt_calc_size(struct xfs_mount *mp,
53		unsigned long long len);
54
55#endif	/* __XFS_ALLOC_BTREE_H__ */