xfs_rmap_btree.h

 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;
13struct xfbtree;
14
15/* rmaps only exist on crc enabled filesystems */
16#define XFS_RMAP_BLOCK_LEN	XFS_BTREE_SBLOCK_CRC_LEN
17
18/*
19 * Record, key, and pointer address macros for btree blocks.
20 *
21 * (note that some of these may appear unused, but they are used in userspace)
22 */
23#define XFS_RMAP_REC_ADDR(block, index) \
24	((struct xfs_rmap_rec *) \
25		((char *)(block) + XFS_RMAP_BLOCK_LEN + \
26		 (((index) - 1) * sizeof(struct xfs_rmap_rec))))
27
28#define XFS_RMAP_KEY_ADDR(block, index) \
29	((struct xfs_rmap_key *) \
30		((char *)(block) + XFS_RMAP_BLOCK_LEN + \
31		 ((index) - 1) * 2 * sizeof(struct xfs_rmap_key)))
32
33#define XFS_RMAP_HIGH_KEY_ADDR(block, index) \
34	((struct xfs_rmap_key *) \
35		((char *)(block) + XFS_RMAP_BLOCK_LEN + \
36		 sizeof(struct xfs_rmap_key) + \
37		 ((index) - 1) * 2 * sizeof(struct xfs_rmap_key)))
38
39#define XFS_RMAP_PTR_ADDR(block, index, maxrecs) \
40	((xfs_rmap_ptr_t *) \
41		((char *)(block) + XFS_RMAP_BLOCK_LEN + \
42		 (maxrecs) * 2 * sizeof(struct xfs_rmap_key) + \
43		 ((index) - 1) * sizeof(xfs_rmap_ptr_t)))
44
45struct xfs_btree_cur *xfs_rmapbt_init_cursor(struct xfs_mount *mp,
46				struct xfs_trans *tp, struct xfs_buf *bp,
47				struct xfs_perag *pag);
48void xfs_rmapbt_commit_staged_btree(struct xfs_btree_cur *cur,
49		struct xfs_trans *tp, struct xfs_buf *agbp);
50unsigned int xfs_rmapbt_maxrecs(struct xfs_mount *mp, unsigned int blocklen,
51		bool 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
67struct xfs_btree_cur *xfs_rmapbt_mem_cursor(struct xfs_perag *pag,
68		struct xfs_trans *tp, struct xfbtree *xfbtree);
69int xfs_rmapbt_mem_init(struct xfs_mount *mp, struct xfbtree *xfbtree,
70		struct xfs_buftarg *btp, xfs_agnumber_t agno);
71
72#endif /* __XFS_RMAP_BTREE_H__ */