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;
16struct xbtree_afakeroot;
17
18/*
19 * Btree block header size depends on a superblock flag.
20 */
21#define XFS_ALLOC_BLOCK_LEN(mp) \
22	(xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
23		XFS_BTREE_SBLOCK_CRC_LEN : XFS_BTREE_SBLOCK_LEN)
24
25/*
26 * Record, key, and pointer address macros for btree blocks.
27 *
28 * (note that some of these may appear unused, but they are used in userspace)
29 */
30#define XFS_ALLOC_REC_ADDR(mp, block, index) \
31	((xfs_alloc_rec_t *) \
32		((char *)(block) + \
33		 XFS_ALLOC_BLOCK_LEN(mp) + \
34		 (((index) - 1) * sizeof(xfs_alloc_rec_t))))
35
36#define XFS_ALLOC_KEY_ADDR(mp, block, index) \
37	((xfs_alloc_key_t *) \
38		((char *)(block) + \
39		 XFS_ALLOC_BLOCK_LEN(mp) + \
40		 ((index) - 1) * sizeof(xfs_alloc_key_t)))
41
42#define XFS_ALLOC_PTR_ADDR(mp, block, index, maxrecs) \
43	((xfs_alloc_ptr_t *) \
44		((char *)(block) + \
45		 XFS_ALLOC_BLOCK_LEN(mp) + \
46		 (maxrecs) * sizeof(xfs_alloc_key_t) + \
47		 ((index) - 1) * sizeof(xfs_alloc_ptr_t)))
48
49extern struct xfs_btree_cur *xfs_allocbt_init_cursor(struct xfs_mount *,
50		struct xfs_trans *, struct xfs_buf *,
51		xfs_agnumber_t, xfs_btnum_t);
52struct xfs_btree_cur *xfs_allocbt_stage_cursor(struct xfs_mount *mp,
53		struct xbtree_afakeroot *afake, xfs_agnumber_t agno,
54		xfs_btnum_t btnum);
55extern int xfs_allocbt_maxrecs(struct xfs_mount *, int, int);
56extern xfs_extlen_t xfs_allocbt_calc_size(struct xfs_mount *mp,
57		unsigned long long len);
58
59void xfs_allocbt_commit_staged_btree(struct xfs_btree_cur *cur,
60		struct xfs_trans *tp, struct xfs_buf *agbp);
61
62#endif	/* __XFS_ALLOC_BTREE_H__ */