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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_IALLOC_BTREE_H__ | |
19 | #define __XFS_IALLOC_BTREE_H__ | |
20 | ||
21 | /* | |
22 | * Inode map 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 is a btree for the inode map per allocation group. | |
32 | */ | |
33 | #define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */ | |
34 | ||
35 | typedef __uint64_t xfs_inofree_t; | |
36 | #define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t)) | |
37 | #define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3) | |
38 | #define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1) | |
39 | ||
1da177e4 | 40 | #define XFS_INOBT_MASKN(i,n) xfs_inobt_maskn(i,n) |
a844f451 NS |
41 | static inline xfs_inofree_t xfs_inobt_maskn(int i, int n) |
42 | { | |
43 | return (((n) >= XFS_INODES_PER_CHUNK ? \ | |
44 | (xfs_inofree_t)0 : ((xfs_inofree_t)1 << (n))) - 1) << (i); | |
45 | } | |
1da177e4 LT |
46 | |
47 | /* | |
48 | * Data record structure | |
49 | */ | |
50 | typedef struct xfs_inobt_rec | |
51 | { | |
52 | xfs_agino_t ir_startino; /* starting inode number */ | |
53 | __int32_t ir_freecount; /* count of free inodes (set bits) */ | |
54 | xfs_inofree_t ir_free; /* free inode mask */ | |
55 | } xfs_inobt_rec_t; | |
56 | ||
57 | /* | |
58 | * Key structure | |
59 | */ | |
60 | typedef struct xfs_inobt_key | |
61 | { | |
62 | xfs_agino_t ir_startino; /* starting inode number */ | |
63 | } xfs_inobt_key_t; | |
64 | ||
65 | typedef xfs_agblock_t xfs_inobt_ptr_t; /* btree pointer type */ | |
66 | /* btree block header type */ | |
67 | typedef struct xfs_btree_sblock xfs_inobt_block_t; | |
68 | ||
a844f451 | 69 | #define XFS_BUF_TO_INOBT_BLOCK(bp) ((xfs_inobt_block_t *)XFS_BUF_PTR(bp)) |
1da177e4 LT |
70 | |
71 | /* | |
72 | * Bit manipulations for ir_free. | |
73 | */ | |
1da177e4 | 74 | #define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i)) |
a844f451 NS |
75 | #define XFS_INOBT_IS_FREE(rp,i) \ |
76 | (((rp)->ir_free & XFS_INOBT_MASK(i)) != 0) | |
77 | #define XFS_INOBT_IS_FREE_DISK(rp,i) \ | |
78 | ((INT_GET((rp)->ir_free,ARCH_CONVERT) & XFS_INOBT_MASK(i)) != 0) | |
1da177e4 | 79 | #define XFS_INOBT_SET_FREE(rp,i) ((rp)->ir_free |= XFS_INOBT_MASK(i)) |
1da177e4 | 80 | #define XFS_INOBT_CLR_FREE(rp,i) ((rp)->ir_free &= ~XFS_INOBT_MASK(i)) |
1da177e4 LT |
81 | |
82 | /* | |
83 | * Real block structures have a size equal to the disk block size. | |
84 | */ | |
1da177e4 | 85 | #define XFS_INOBT_BLOCK_SIZE(lev,cur) (1 << (cur)->bc_blocklog) |
a844f451 NS |
86 | #define XFS_INOBT_BLOCK_MAXRECS(lev,cur) ((cur)->bc_mp->m_inobt_mxr[lev != 0]) |
87 | #define XFS_INOBT_BLOCK_MINRECS(lev,cur) ((cur)->bc_mp->m_inobt_mnr[lev != 0]) | |
1da177e4 | 88 | #define XFS_INOBT_IS_LAST_REC(cur) \ |
a844f451 | 89 | ((cur)->bc_ptrs[0] == INT_GET(XFS_BUF_TO_INOBT_BLOCK((cur)->bc_bufs[0])->bb_numrecs, ARCH_CONVERT)) |
1da177e4 LT |
90 | |
91 | /* | |
92 | * Maximum number of inode btree levels. | |
93 | */ | |
1da177e4 | 94 | #define XFS_IN_MAXLEVELS(mp) ((mp)->m_in_maxlevels) |
1da177e4 LT |
95 | |
96 | /* | |
97 | * block numbers in the AG. | |
98 | */ | |
a844f451 NS |
99 | #define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1)) |
100 | #define XFS_PREALLOC_BLOCKS(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1)) | |
1da177e4 LT |
101 | |
102 | /* | |
103 | * Record, key, and pointer address macros for btree blocks. | |
104 | */ | |
a844f451 NS |
105 | #define XFS_INOBT_REC_ADDR(bb,i,cur) \ |
106 | (XFS_BTREE_REC_ADDR(XFS_INOBT_BLOCK_SIZE(0,cur), xfs_inobt, bb, \ | |
107 | i, XFS_INOBT_BLOCK_MAXRECS(0, cur))) | |
108 | #define XFS_INOBT_KEY_ADDR(bb,i,cur) \ | |
109 | (XFS_BTREE_KEY_ADDR(XFS_INOBT_BLOCK_SIZE(1,cur), xfs_inobt, bb, \ | |
110 | i, XFS_INOBT_BLOCK_MAXRECS(1, cur))) | |
1da177e4 | 111 | |
a844f451 NS |
112 | #define XFS_INOBT_PTR_ADDR(bb,i,cur) \ |
113 | (XFS_BTREE_PTR_ADDR(XFS_INOBT_BLOCK_SIZE(1,cur), xfs_inobt, bb, \ | |
114 | i, XFS_INOBT_BLOCK_MAXRECS(1, cur))) | |
1da177e4 LT |
115 | |
116 | /* | |
117 | * Decrement cursor by one record at the level. | |
118 | * For nonzero levels the leaf-ward information is untouched. | |
119 | */ | |
a844f451 | 120 | extern int xfs_inobt_decrement(struct xfs_btree_cur *cur, int level, int *stat); |
1da177e4 LT |
121 | |
122 | /* | |
123 | * Delete the record pointed to by cur. | |
124 | * The cursor refers to the place where the record was (could be inserted) | |
125 | * when the operation returns. | |
126 | */ | |
a844f451 | 127 | extern int xfs_inobt_delete(struct xfs_btree_cur *cur, int *stat); |
1da177e4 LT |
128 | |
129 | /* | |
130 | * Get the data from the pointed-to record. | |
131 | */ | |
a844f451 NS |
132 | extern int xfs_inobt_get_rec(struct xfs_btree_cur *cur, xfs_agino_t *ino, |
133 | __int32_t *fcnt, xfs_inofree_t *free, int *stat); | |
1da177e4 LT |
134 | |
135 | /* | |
136 | * Increment cursor by one record at the level. | |
137 | * For nonzero levels the leaf-ward information is untouched. | |
138 | */ | |
a844f451 | 139 | extern int xfs_inobt_increment(struct xfs_btree_cur *cur, int level, int *stat); |
1da177e4 LT |
140 | |
141 | /* | |
142 | * Insert the current record at the point referenced by cur. | |
143 | * The cursor may be inconsistent on return if splits have been done. | |
144 | */ | |
a844f451 | 145 | extern int xfs_inobt_insert(struct xfs_btree_cur *cur, int *stat); |
1da177e4 LT |
146 | |
147 | /* | |
148 | * Lookup the record equal to ino in the btree given by cur. | |
149 | */ | |
a844f451 NS |
150 | extern int xfs_inobt_lookup_eq(struct xfs_btree_cur *cur, xfs_agino_t ino, |
151 | __int32_t fcnt, xfs_inofree_t free, int *stat); | |
1da177e4 LT |
152 | |
153 | /* | |
154 | * Lookup the first record greater than or equal to ino | |
155 | * in the btree given by cur. | |
156 | */ | |
a844f451 NS |
157 | extern int xfs_inobt_lookup_ge(struct xfs_btree_cur *cur, xfs_agino_t ino, |
158 | __int32_t fcnt, xfs_inofree_t free, int *stat); | |
1da177e4 LT |
159 | |
160 | /* | |
161 | * Lookup the first record less than or equal to ino | |
162 | * in the btree given by cur. | |
163 | */ | |
a844f451 NS |
164 | extern int xfs_inobt_lookup_le(struct xfs_btree_cur *cur, xfs_agino_t ino, |
165 | __int32_t fcnt, xfs_inofree_t free, int *stat); | |
1da177e4 LT |
166 | |
167 | /* | |
168 | * Update the record referred to by cur, to the value given | |
169 | * by [ino, fcnt, free]. | |
170 | * This either works (return 0) or gets an EFSCORRUPTED error. | |
171 | */ | |
a844f451 NS |
172 | extern int xfs_inobt_update(struct xfs_btree_cur *cur, xfs_agino_t ino, |
173 | __int32_t fcnt, xfs_inofree_t free); | |
1da177e4 LT |
174 | |
175 | #endif /* __XFS_IALLOC_BTREE_H__ */ |