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 xfs_perag;
17struct xbtree_afakeroot;
18
19/*
20 * Btree block header size
21 */
22#define XFS_REFCOUNT_BLOCK_LEN	XFS_BTREE_SBLOCK_CRC_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_REFCOUNT_REC_ADDR(block, index) \
30	((struct xfs_refcount_rec *) \
31		((char *)(block) + \
32		 XFS_REFCOUNT_BLOCK_LEN + \
33		 (((index) - 1) * sizeof(struct xfs_refcount_rec))))
34
35#define XFS_REFCOUNT_KEY_ADDR(block, index) \
36	((struct xfs_refcount_key *) \
37		((char *)(block) + \
38		 XFS_REFCOUNT_BLOCK_LEN + \
39		 ((index) - 1) * sizeof(struct xfs_refcount_key)))
40
41#define XFS_REFCOUNT_PTR_ADDR(block, index, maxrecs) \
42	((xfs_refcount_ptr_t *) \
43		((char *)(block) + \
44		 XFS_REFCOUNT_BLOCK_LEN + \
45		 (maxrecs) * sizeof(struct xfs_refcount_key) + \
46		 ((index) - 1) * sizeof(xfs_refcount_ptr_t)))
47
48extern struct xfs_btree_cur *xfs_refcountbt_init_cursor(struct xfs_mount *mp,
49		struct xfs_trans *tp, struct xfs_buf *agbp,
50		struct xfs_perag *pag);
51struct xfs_btree_cur *xfs_refcountbt_stage_cursor(struct xfs_mount *mp,
52		struct xbtree_afakeroot *afake, struct xfs_perag *pag);
53extern int xfs_refcountbt_maxrecs(int blocklen, bool leaf);
54extern void xfs_refcountbt_compute_maxlevels(struct xfs_mount *mp);
55
56extern xfs_extlen_t xfs_refcountbt_calc_size(struct xfs_mount *mp,
57		unsigned long long len);
58extern xfs_extlen_t xfs_refcountbt_max_size(struct xfs_mount *mp,
59		xfs_agblock_t agblocks);
60
61extern int xfs_refcountbt_calc_reserves(struct xfs_mount *mp,
62		struct xfs_trans *tp, struct xfs_perag *pag, xfs_extlen_t *ask,
63		xfs_extlen_t *used);
64
65void xfs_refcountbt_commit_staged_btree(struct xfs_btree_cur *cur,
66		struct xfs_trans *tp, struct xfs_buf *agbp);
67
68unsigned int xfs_refcountbt_maxlevels_ondisk(void);
69
70int __init xfs_refcountbt_init_cur_cache(void);
71void xfs_refcountbt_destroy_cur_cache(void);
72
73#endif	/* __XFS_REFCOUNT_BTREE_H__ */