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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000,2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
9 | * This program is distributed in the hope that it would be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
1da177e4 | 13 | * |
7b718769 NS |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 LT |
17 | */ |
18 | #ifndef __XFS_ALLOC_BTREE_H__ | |
19 | #define __XFS_ALLOC_BTREE_H__ | |
20 | ||
21 | /* | |
22 | * Freespace on-disk structures | |
23 | */ | |
24 | ||
25 | struct xfs_buf; | |
26 | struct xfs_btree_cur; | |
27 | struct xfs_btree_sblock; | |
28 | struct xfs_mount; | |
29 | ||
30 | /* | |
31 | * There are two on-disk btrees, one sorted by blockno and one sorted | |
32 | * by blockcount and blockno. All blocks look the same to make the code | |
33 | * simpler; if we have time later, we'll make the optimizations. | |
34 | */ | |
35 | #define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */ | |
36 | #define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */ | |
37 | ||
38 | /* | |
39 | * Data record/key structure | |
40 | */ | |
16259e7d CH |
41 | typedef struct xfs_alloc_rec { |
42 | __be32 ar_startblock; /* starting block number */ | |
43 | __be32 ar_blockcount; /* count of free blocks */ | |
44 | } xfs_alloc_rec_t, xfs_alloc_key_t; | |
45 | ||
46 | typedef struct xfs_alloc_rec_incore { | |
1da177e4 LT |
47 | xfs_agblock_t ar_startblock; /* starting block number */ |
48 | xfs_extlen_t ar_blockcount; /* count of free blocks */ | |
16259e7d | 49 | } xfs_alloc_rec_incore_t; |
1da177e4 | 50 | |
16259e7d CH |
51 | /* btree pointer type */ |
52 | typedef __be32 xfs_alloc_ptr_t; | |
53 | /* btree block header type */ | |
1da177e4 LT |
54 | typedef struct xfs_btree_sblock xfs_alloc_block_t; |
55 | ||
a844f451 | 56 | #define XFS_BUF_TO_ALLOC_BLOCK(bp) ((xfs_alloc_block_t *)XFS_BUF_PTR(bp)) |
1da177e4 LT |
57 | |
58 | /* | |
59 | * Real block structures have a size equal to the disk block size. | |
60 | */ | |
a844f451 NS |
61 | #define XFS_ALLOC_BLOCK_MAXRECS(lev,cur) ((cur)->bc_mp->m_alloc_mxr[lev != 0]) |
62 | #define XFS_ALLOC_BLOCK_MINRECS(lev,cur) ((cur)->bc_mp->m_alloc_mnr[lev != 0]) | |
1da177e4 LT |
63 | |
64 | /* | |
65 | * Minimum and maximum blocksize and sectorsize. | |
66 | * The blocksize upper limit is pretty much arbitrary. | |
67 | * The sectorsize upper limit is due to sizeof(sb_sectsize). | |
68 | */ | |
69 | #define XFS_MIN_BLOCKSIZE_LOG 9 /* i.e. 512 bytes */ | |
70 | #define XFS_MAX_BLOCKSIZE_LOG 16 /* i.e. 65536 bytes */ | |
71 | #define XFS_MIN_BLOCKSIZE (1 << XFS_MIN_BLOCKSIZE_LOG) | |
72 | #define XFS_MAX_BLOCKSIZE (1 << XFS_MAX_BLOCKSIZE_LOG) | |
73 | #define XFS_MIN_SECTORSIZE_LOG 9 /* i.e. 512 bytes */ | |
74 | #define XFS_MAX_SECTORSIZE_LOG 15 /* i.e. 32768 bytes */ | |
75 | #define XFS_MIN_SECTORSIZE (1 << XFS_MIN_SECTORSIZE_LOG) | |
76 | #define XFS_MAX_SECTORSIZE (1 << XFS_MAX_SECTORSIZE_LOG) | |
77 | ||
78 | /* | |
79 | * Block numbers in the AG: | |
80 | * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3. | |
81 | */ | |
1da177e4 | 82 | #define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1)) |
1da177e4 | 83 | #define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1)) |
1da177e4 LT |
84 | |
85 | /* | |
86 | * Record, key, and pointer address macros for btree blocks. | |
87 | */ | |
1da177e4 | 88 | #define XFS_ALLOC_REC_ADDR(bb,i,cur) \ |
2c36dded | 89 | XFS_BTREE_REC_ADDR(xfs_alloc, bb, i) |
1da177e4 | 90 | |
1da177e4 | 91 | #define XFS_ALLOC_KEY_ADDR(bb,i,cur) \ |
2c36dded | 92 | XFS_BTREE_KEY_ADDR(xfs_alloc, bb, i) |
1da177e4 | 93 | |
1da177e4 | 94 | #define XFS_ALLOC_PTR_ADDR(bb,i,cur) \ |
2c36dded | 95 | XFS_BTREE_PTR_ADDR(xfs_alloc, bb, i, XFS_ALLOC_BLOCK_MAXRECS(1, cur)) |
1da177e4 LT |
96 | |
97 | /* | |
98 | * Decrement cursor by one record at the level. | |
99 | * For nonzero levels the leaf-ward information is untouched. | |
100 | */ | |
a844f451 | 101 | extern int xfs_alloc_decrement(struct xfs_btree_cur *cur, int level, int *stat); |
1da177e4 LT |
102 | |
103 | /* | |
104 | * Delete the record pointed to by cur. | |
105 | * The cursor refers to the place where the record was (could be inserted) | |
106 | * when the operation returns. | |
107 | */ | |
a844f451 | 108 | extern int xfs_alloc_delete(struct xfs_btree_cur *cur, int *stat); |
1da177e4 LT |
109 | |
110 | /* | |
111 | * Get the data from the pointed-to record. | |
112 | */ | |
a844f451 NS |
113 | extern int xfs_alloc_get_rec(struct xfs_btree_cur *cur, xfs_agblock_t *bno, |
114 | xfs_extlen_t *len, int *stat); | |
1da177e4 LT |
115 | |
116 | /* | |
117 | * Increment cursor by one record at the level. | |
118 | * For nonzero levels the leaf-ward information is untouched. | |
119 | */ | |
a844f451 | 120 | extern int xfs_alloc_increment(struct xfs_btree_cur *cur, int level, int *stat); |
1da177e4 LT |
121 | |
122 | /* | |
123 | * Insert the current record at the point referenced by cur. | |
124 | * The cursor may be inconsistent on return if splits have been done. | |
125 | */ | |
a844f451 | 126 | extern int xfs_alloc_insert(struct xfs_btree_cur *cur, int *stat); |
1da177e4 LT |
127 | |
128 | /* | |
129 | * Lookup the record equal to [bno, len] in the btree given by cur. | |
130 | */ | |
a844f451 NS |
131 | extern int xfs_alloc_lookup_eq(struct xfs_btree_cur *cur, xfs_agblock_t bno, |
132 | xfs_extlen_t len, int *stat); | |
1da177e4 LT |
133 | |
134 | /* | |
135 | * Lookup the first record greater than or equal to [bno, len] | |
136 | * in the btree given by cur. | |
137 | */ | |
a844f451 NS |
138 | extern int xfs_alloc_lookup_ge(struct xfs_btree_cur *cur, xfs_agblock_t bno, |
139 | xfs_extlen_t len, int *stat); | |
1da177e4 LT |
140 | |
141 | /* | |
142 | * Lookup the first record less than or equal to [bno, len] | |
143 | * in the btree given by cur. | |
144 | */ | |
a844f451 NS |
145 | extern int xfs_alloc_lookup_le(struct xfs_btree_cur *cur, xfs_agblock_t bno, |
146 | xfs_extlen_t len, int *stat); | |
1da177e4 LT |
147 | |
148 | /* | |
149 | * Update the record referred to by cur, to the value given by [bno, len]. | |
150 | * This either works (return 0) or gets an EFSCORRUPTED error. | |
151 | */ | |
a844f451 NS |
152 | extern int xfs_alloc_update(struct xfs_btree_cur *cur, xfs_agblock_t bno, |
153 | xfs_extlen_t len); | |
1da177e4 LT |
154 | |
155 | #endif /* __XFS_ALLOC_BTREE_H__ */ |