1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2016 Oracle.  All Rights Reserved.
4 * Author: Darrick J. Wong <darrick.wong@oracle.com>
5 */
6#ifndef __XFS_REFCOUNT_BTREE_H__
7#define	__XFS_REFCOUNT_BTREE_H__
8
9/*
10 * Reference Count Btree 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
20 */
21#define XFS_REFCOUNT_BLOCK_LEN	XFS_BTREE_SBLOCK_CRC_LEN
22
23/*
24 * Record, key, and pointer address macros for btree blocks.
25 *
26 * (note that some of these may appear unused, but they are used in userspace)
27 */
28#define XFS_REFCOUNT_REC_ADDR(block, index) \
29	((struct xfs_refcount_rec *) \
30		((char *)(block) + \
31		 XFS_REFCOUNT_BLOCK_LEN + \
32		 (((index) - 1) * sizeof(struct xfs_refcount_rec))))
33
34#define XFS_REFCOUNT_KEY_ADDR(block, index) \
35	((struct xfs_refcount_key *) \
36		((char *)(block) + \
37		 XFS_REFCOUNT_BLOCK_LEN + \
38		 ((index) - 1) * sizeof(struct xfs_refcount_key)))
39
40#define XFS_REFCOUNT_PTR_ADDR(block, index, maxrecs) \
41	((xfs_refcount_ptr_t *) \
42		((char *)(block) + \
43		 XFS_REFCOUNT_BLOCK_LEN + \
44		 (maxrecs) * sizeof(struct xfs_refcount_key) + \
45		 ((index) - 1) * sizeof(xfs_refcount_ptr_t)))
46
47extern struct xfs_btree_cur *xfs_refcountbt_init_cursor(struct xfs_mount *mp,
48		struct xfs_trans *tp, struct xfs_buf *agbp,
49		xfs_agnumber_t agno);
50struct xfs_btree_cur *xfs_refcountbt_stage_cursor(struct xfs_mount *mp,
51		struct xbtree_afakeroot *afake, xfs_agnumber_t agno);
52extern int xfs_refcountbt_maxrecs(int blocklen, bool leaf);
53extern void xfs_refcountbt_compute_maxlevels(struct xfs_mount *mp);
54
55extern xfs_extlen_t xfs_refcountbt_calc_size(struct xfs_mount *mp,
56		unsigned long long len);
57extern xfs_extlen_t xfs_refcountbt_max_size(struct xfs_mount *mp,
58		xfs_agblock_t agblocks);
59
60extern int xfs_refcountbt_calc_reserves(struct xfs_mount *mp,
61		struct xfs_trans *tp, xfs_agnumber_t agno, xfs_extlen_t *ask,
62		xfs_extlen_t *used);
63
64void xfs_refcountbt_commit_staged_btree(struct xfs_btree_cur *cur,
65		struct xfs_trans *tp, struct xfs_buf *agbp);
66
67#endif	/* __XFS_REFCOUNT_BTREE_H__ */
68