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 
13 struct xfs_buf;
14 struct xfs_btree_cur;
15 struct xfs_mount;
16 struct xfs_perag;
17 struct 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 
48 extern 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);
51 struct xfs_btree_cur *xfs_refcountbt_stage_cursor(struct xfs_mount *mp,
52 		struct xbtree_afakeroot *afake, struct xfs_perag *pag);
53 extern int xfs_refcountbt_maxrecs(int blocklen, bool leaf);
54 extern void xfs_refcountbt_compute_maxlevels(struct xfs_mount *mp);
55 
56 extern xfs_extlen_t xfs_refcountbt_calc_size(struct xfs_mount *mp,
57 		unsigned long long len);
58 extern xfs_extlen_t xfs_refcountbt_max_size(struct xfs_mount *mp,
59 		xfs_agblock_t agblocks);
60 
61 extern 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 
65 void xfs_refcountbt_commit_staged_btree(struct xfs_btree_cur *cur,
66 		struct xfs_trans *tp, struct xfs_buf *agbp);
67 
68 unsigned int xfs_refcountbt_maxlevels_ondisk(void);
69 
70 int __init xfs_refcountbt_init_cur_cache(void);
71 void xfs_refcountbt_destroy_cur_cache(void);
72 
73 #endif	/* __XFS_REFCOUNT_BTREE_H__ */
74