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
9 struct xfs_btree_cur;
10 struct xfs_btree_block;
11 struct xfs_mount;
12 struct xfs_inode;
13 struct xfs_trans;
14 struct xbtree_ifakeroot;
15
16 /*
17 * Maximum number of bmap btree levels.
18 */
19 #define XFS_BM_MAXLEVELS(mp,w) ((mp)->m_bm_maxlevels[(w)])
20
21 /*
22 * Prototypes for xfs_bmap.c to call.
23 */
24 extern void xfs_bmdr_to_bmbt(struct xfs_inode *, xfs_bmdr_block_t *, int,
25 struct xfs_btree_block *, int);
26
27 void xfs_bmbt_disk_set_all(struct xfs_bmbt_rec *r, struct xfs_bmbt_irec *s);
28 extern xfs_filblks_t xfs_bmbt_disk_get_blockcount(const struct xfs_bmbt_rec *r);
29 extern xfs_fileoff_t xfs_bmbt_disk_get_startoff(const struct xfs_bmbt_rec *r);
30 void xfs_bmbt_disk_get_all(const struct xfs_bmbt_rec *r,
31 struct xfs_bmbt_irec *s);
32
33 extern void xfs_bmbt_to_bmdr(struct xfs_mount *, struct xfs_btree_block *, int,
34 xfs_bmdr_block_t *, int);
35
36 extern int xfs_bmbt_get_maxrecs(struct xfs_btree_cur *, int level);
37 extern int xfs_bmdr_maxrecs(int blocklen, int leaf);
38 unsigned int xfs_bmbt_maxrecs(struct xfs_mount *mp, unsigned int blocklen,
39 bool leaf);
40
41 extern int xfs_bmbt_change_owner(struct xfs_trans *tp, struct xfs_inode *ip,
42 int whichfork, xfs_ino_t new_owner,
43 struct list_head *buffer_list);
44
45 extern struct xfs_btree_cur *xfs_bmbt_init_cursor(struct xfs_mount *,
46 struct xfs_trans *, struct xfs_inode *, int);
47 void xfs_bmbt_commit_staged_btree(struct xfs_btree_cur *cur,
48 struct xfs_trans *tp, int whichfork);
49
50 extern unsigned long long xfs_bmbt_calc_size(struct xfs_mount *mp,
51 unsigned long long len);
52
53 unsigned int xfs_bmbt_maxlevels_ondisk(void);
54
55 int __init xfs_bmbt_init_cur_cache(void);
56 void xfs_bmbt_destroy_cur_cache(void);
57
58 void xfs_bmbt_init_block(struct xfs_inode *ip, struct xfs_btree_block *buf,
59 struct xfs_buf *bp, __u16 level, __u16 numrecs);
60
61 /*
62 * Btree block header size depends on a superblock flag.
63 */
64 static inline size_t
xfs_bmbt_block_len(struct xfs_mount * mp)65 xfs_bmbt_block_len(struct xfs_mount *mp)
66 {
67 return xfs_has_crc(mp) ?
68 XFS_BTREE_LBLOCK_CRC_LEN : XFS_BTREE_LBLOCK_LEN;
69 }
70
71 /* Addresses of key, pointers, and records within an incore bmbt block. */
72
73 static inline struct xfs_bmbt_rec *
xfs_bmbt_rec_addr(struct xfs_mount * mp,struct xfs_btree_block * block,unsigned int index)74 xfs_bmbt_rec_addr(
75 struct xfs_mount *mp,
76 struct xfs_btree_block *block,
77 unsigned int index)
78 {
79 return (struct xfs_bmbt_rec *)
80 ((char *)block + xfs_bmbt_block_len(mp) +
81 (index - 1) * sizeof(struct xfs_bmbt_rec));
82 }
83
84 static inline struct xfs_bmbt_key *
xfs_bmbt_key_addr(struct xfs_mount * mp,struct xfs_btree_block * block,unsigned int index)85 xfs_bmbt_key_addr(
86 struct xfs_mount *mp,
87 struct xfs_btree_block *block,
88 unsigned int index)
89 {
90 return (struct xfs_bmbt_key *)
91 ((char *)block + xfs_bmbt_block_len(mp) +
92 (index - 1) * sizeof(struct xfs_bmbt_key *));
93 }
94
95 static inline xfs_bmbt_ptr_t *
xfs_bmbt_ptr_addr(struct xfs_mount * mp,struct xfs_btree_block * block,unsigned int index,unsigned int maxrecs)96 xfs_bmbt_ptr_addr(
97 struct xfs_mount *mp,
98 struct xfs_btree_block *block,
99 unsigned int index,
100 unsigned int maxrecs)
101 {
102 return (xfs_bmbt_ptr_t *)
103 ((char *)block + xfs_bmbt_block_len(mp) +
104 maxrecs * sizeof(struct xfs_bmbt_key) +
105 (index - 1) * sizeof(xfs_bmbt_ptr_t));
106 }
107
108 /* Addresses of key, pointers, and records within an ondisk bmbt block. */
109
110 static inline struct xfs_bmbt_rec *
xfs_bmdr_rec_addr(struct xfs_bmdr_block * block,unsigned int index)111 xfs_bmdr_rec_addr(
112 struct xfs_bmdr_block *block,
113 unsigned int index)
114 {
115 return (struct xfs_bmbt_rec *)
116 ((char *)(block + 1) +
117 (index - 1) * sizeof(struct xfs_bmbt_rec));
118 }
119
120 static inline struct xfs_bmbt_key *
xfs_bmdr_key_addr(struct xfs_bmdr_block * block,unsigned int index)121 xfs_bmdr_key_addr(
122 struct xfs_bmdr_block *block,
123 unsigned int index)
124 {
125 return (struct xfs_bmbt_key *)
126 ((char *)(block + 1) +
127 (index - 1) * sizeof(struct xfs_bmbt_key));
128 }
129
130 static inline xfs_bmbt_ptr_t *
xfs_bmdr_ptr_addr(struct xfs_bmdr_block * block,unsigned int index,unsigned int maxrecs)131 xfs_bmdr_ptr_addr(
132 struct xfs_bmdr_block *block,
133 unsigned int index,
134 unsigned int maxrecs)
135 {
136 return (xfs_bmbt_ptr_t *)
137 ((char *)(block + 1) +
138 maxrecs * sizeof(struct xfs_bmbt_key) +
139 (index - 1) * sizeof(xfs_bmbt_ptr_t));
140 }
141
142 /*
143 * Address of pointers within the incore btree root.
144 *
145 * These are to be used when we know the size of the block and
146 * we don't have a cursor.
147 */
148 static inline xfs_bmbt_ptr_t *
xfs_bmap_broot_ptr_addr(struct xfs_mount * mp,struct xfs_btree_block * bb,unsigned int i,unsigned int sz)149 xfs_bmap_broot_ptr_addr(
150 struct xfs_mount *mp,
151 struct xfs_btree_block *bb,
152 unsigned int i,
153 unsigned int sz)
154 {
155 return xfs_bmbt_ptr_addr(mp, bb, i, xfs_bmbt_maxrecs(mp, sz, false));
156 }
157
158 /*
159 * Compute the space required for the incore btree root containing the given
160 * number of records.
161 */
162 static inline size_t
xfs_bmap_broot_space_calc(struct xfs_mount * mp,unsigned int nrecs)163 xfs_bmap_broot_space_calc(
164 struct xfs_mount *mp,
165 unsigned int nrecs)
166 {
167 return xfs_bmbt_block_len(mp) +
168 (nrecs * (sizeof(struct xfs_bmbt_key) + sizeof(xfs_bmbt_ptr_t)));
169 }
170
171 /*
172 * Compute the space required for the incore btree root given the ondisk
173 * btree root block.
174 */
175 static inline size_t
xfs_bmap_broot_space(struct xfs_mount * mp,struct xfs_bmdr_block * bb)176 xfs_bmap_broot_space(
177 struct xfs_mount *mp,
178 struct xfs_bmdr_block *bb)
179 {
180 return xfs_bmap_broot_space_calc(mp, be16_to_cpu(bb->bb_numrecs));
181 }
182
183 /* Compute the space required for the ondisk root block. */
184 static inline size_t
xfs_bmdr_space_calc(unsigned int nrecs)185 xfs_bmdr_space_calc(unsigned int nrecs)
186 {
187 return sizeof(struct xfs_bmdr_block) +
188 (nrecs * (sizeof(struct xfs_bmbt_key) + sizeof(xfs_bmbt_ptr_t)));
189 }
190
191 /*
192 * Compute the space required for the ondisk root block given an incore root
193 * block.
194 */
195 static inline size_t
xfs_bmap_bmdr_space(struct xfs_btree_block * bb)196 xfs_bmap_bmdr_space(struct xfs_btree_block *bb)
197 {
198 return xfs_bmdr_space_calc(be16_to_cpu(bb->bb_numrecs));
199 }
200
201 #endif /* __XFS_BMAP_BTREE_H__ */
202