xfs_bmap_btree.h revision 22ece4e8
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (c) 2000,2002-2005 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6#ifndef __XFS_BMAP_BTREE_H__
7#define __XFS_BMAP_BTREE_H__
8
9struct xfs_btree_cur;
10struct xfs_btree_block;
11struct xfs_mount;
12struct xfs_inode;
13struct xfs_trans;
14
15/*
16 * Btree block header size depends on a superblock flag.
17 */
18#define XFS_BMBT_BLOCK_LEN(mp) \
19	(xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
20		XFS_BTREE_LBLOCK_CRC_LEN : XFS_BTREE_LBLOCK_LEN)
21
22#define XFS_BMBT_REC_ADDR(mp, block, index) \
23	((xfs_bmbt_rec_t *) \
24		((char *)(block) + \
25		 XFS_BMBT_BLOCK_LEN(mp) + \
26		 ((index) - 1) * sizeof(xfs_bmbt_rec_t)))
27
28#define XFS_BMBT_KEY_ADDR(mp, block, index) \
29	((xfs_bmbt_key_t *) \
30		((char *)(block) + \
31		 XFS_BMBT_BLOCK_LEN(mp) + \
32		 ((index) - 1) * sizeof(xfs_bmbt_key_t)))
33
34#define XFS_BMBT_PTR_ADDR(mp, block, index, maxrecs) \
35	((xfs_bmbt_ptr_t *) \
36		((char *)(block) + \
37		 XFS_BMBT_BLOCK_LEN(mp) + \
38		 (maxrecs) * sizeof(xfs_bmbt_key_t) + \
39		 ((index) - 1) * sizeof(xfs_bmbt_ptr_t)))
40
41#define XFS_BMDR_REC_ADDR(block, index) \
42	((xfs_bmdr_rec_t *) \
43		((char *)(block) + \
44		 sizeof(struct xfs_bmdr_block) + \
45	         ((index) - 1) * sizeof(xfs_bmdr_rec_t)))
46
47#define XFS_BMDR_KEY_ADDR(block, index) \
48	((xfs_bmdr_key_t *) \
49		((char *)(block) + \
50		 sizeof(struct xfs_bmdr_block) + \
51		 ((index) - 1) * sizeof(xfs_bmdr_key_t)))
52
53#define XFS_BMDR_PTR_ADDR(block, index, maxrecs) \
54	((xfs_bmdr_ptr_t *) \
55		((char *)(block) + \
56		 sizeof(struct xfs_bmdr_block) + \
57		 (maxrecs) * sizeof(xfs_bmdr_key_t) + \
58		 ((index) - 1) * sizeof(xfs_bmdr_ptr_t)))
59
60/*
61 * These are to be used when we know the size of the block and
62 * we don't have a cursor.
63 */
64#define XFS_BMAP_BROOT_PTR_ADDR(mp, bb, i, sz) \
65	XFS_BMBT_PTR_ADDR(mp, bb, i, xfs_bmbt_maxrecs(mp, sz, 0))
66
67#define XFS_BMAP_BROOT_SPACE_CALC(mp, nrecs) \
68	(int)(XFS_BMBT_BLOCK_LEN(mp) + \
69	       ((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
70
71#define XFS_BMAP_BROOT_SPACE(mp, bb) \
72	(XFS_BMAP_BROOT_SPACE_CALC(mp, be16_to_cpu((bb)->bb_numrecs)))
73#define XFS_BMDR_SPACE_CALC(nrecs) \
74	(int)(sizeof(xfs_bmdr_block_t) + \
75	       ((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
76#define XFS_BMAP_BMDR_SPACE(bb) \
77	(XFS_BMDR_SPACE_CALC(be16_to_cpu((bb)->bb_numrecs)))
78
79/*
80 * Maximum number of bmap btree levels.
81 */
82#define XFS_BM_MAXLEVELS(mp,w)		((mp)->m_bm_maxlevels[(w)])
83
84/*
85 * Prototypes for xfs_bmap.c to call.
86 */
87extern void xfs_bmdr_to_bmbt(struct xfs_inode *, xfs_bmdr_block_t *, int,
88			struct xfs_btree_block *, int);
89
90void xfs_bmbt_disk_set_all(struct xfs_bmbt_rec *r, struct xfs_bmbt_irec *s);
91extern xfs_filblks_t xfs_bmbt_disk_get_blockcount(const struct xfs_bmbt_rec *r);
92extern xfs_fileoff_t xfs_bmbt_disk_get_startoff(const struct xfs_bmbt_rec *r);
93void xfs_bmbt_disk_get_all(const struct xfs_bmbt_rec *r,
94		struct xfs_bmbt_irec *s);
95
96extern void xfs_bmbt_to_bmdr(struct xfs_mount *, struct xfs_btree_block *, int,
97			xfs_bmdr_block_t *, int);
98
99extern int xfs_bmbt_get_maxrecs(struct xfs_btree_cur *, int level);
100extern int xfs_bmdr_maxrecs(int blocklen, int leaf);
101extern int xfs_bmbt_maxrecs(struct xfs_mount *, int blocklen, int leaf);
102
103extern int xfs_bmbt_change_owner(struct xfs_trans *tp, struct xfs_inode *ip,
104				 int whichfork, xfs_ino_t new_owner,
105				 struct list_head *buffer_list);
106
107extern struct xfs_btree_cur *xfs_bmbt_init_cursor(struct xfs_mount *,
108		struct xfs_trans *, struct xfs_inode *, int);
109
110extern unsigned long long xfs_bmbt_calc_size(struct xfs_mount *mp,
111		unsigned long long len);
112
113#endif	/* __XFS_BMAP_BTREE_H__ */
114