1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * Copyright (c) 2014 Red Hat, Inc.
 4 * All Rights Reserved.
 5 */
 6#ifndef __XFS_RMAP_BTREE_H__
 7#define __XFS_RMAP_BTREE_H__
 8
 9struct xfs_buf;
10struct xfs_btree_cur;
11struct xfs_mount;
12struct xbtree_afakeroot;
13
14/* rmaps only exist on crc enabled filesystems */
15#define XFS_RMAP_BLOCK_LEN	XFS_BTREE_SBLOCK_CRC_LEN
16
17/*
18 * Record, key, and pointer address macros for btree blocks.
19 *
20 * (note that some of these may appear unused, but they are used in userspace)
21 */
22#define XFS_RMAP_REC_ADDR(block, index) \
23	((struct xfs_rmap_rec *) \
24		((char *)(block) + XFS_RMAP_BLOCK_LEN + \
25		 (((index) - 1) * sizeof(struct xfs_rmap_rec))))
26
27#define XFS_RMAP_KEY_ADDR(block, index) \
28	((struct xfs_rmap_key *) \
29		((char *)(block) + XFS_RMAP_BLOCK_LEN + \
30		 ((index) - 1) * 2 * sizeof(struct xfs_rmap_key)))
31
32#define XFS_RMAP_HIGH_KEY_ADDR(block, index) \
33	((struct xfs_rmap_key *) \
34		((char *)(block) + XFS_RMAP_BLOCK_LEN + \
35		 sizeof(struct xfs_rmap_key) + \
36		 ((index) - 1) * 2 * sizeof(struct xfs_rmap_key)))
37
38#define XFS_RMAP_PTR_ADDR(block, index, maxrecs) \
39	((xfs_rmap_ptr_t *) \
40		((char *)(block) + XFS_RMAP_BLOCK_LEN + \
41		 (maxrecs) * 2 * sizeof(struct xfs_rmap_key) + \
42		 ((index) - 1) * sizeof(xfs_rmap_ptr_t)))
43
44struct xfs_btree_cur *xfs_rmapbt_init_cursor(struct xfs_mount *mp,
45				struct xfs_trans *tp, struct xfs_buf *bp,
46				struct xfs_perag *pag);
47struct xfs_btree_cur *xfs_rmapbt_stage_cursor(struct xfs_mount *mp,
48		struct xbtree_afakeroot *afake, struct xfs_perag *pag);
49void xfs_rmapbt_commit_staged_btree(struct xfs_btree_cur *cur,
50		struct xfs_trans *tp, struct xfs_buf *agbp);
51int xfs_rmapbt_maxrecs(int blocklen, int leaf);
52extern void xfs_rmapbt_compute_maxlevels(struct xfs_mount *mp);
53
54extern xfs_extlen_t xfs_rmapbt_calc_size(struct xfs_mount *mp,
55		unsigned long long len);
56extern xfs_extlen_t xfs_rmapbt_max_size(struct xfs_mount *mp,
57		xfs_agblock_t agblocks);
58
59extern int xfs_rmapbt_calc_reserves(struct xfs_mount *mp, struct xfs_trans *tp,
60		struct xfs_perag *pag, xfs_extlen_t *ask, xfs_extlen_t *used);
61
62unsigned int xfs_rmapbt_maxlevels_ondisk(void);
63
64int __init xfs_rmapbt_init_cur_cache(void);
65void xfs_rmapbt_destroy_cur_cache(void);
66
67#endif /* __XFS_RMAP_BTREE_H__ */