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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 | */ | |
61a25848 CH |
50 | typedef struct xfs_inobt_rec { |
51 | __be32 ir_startino; /* starting inode number */ | |
52 | __be32 ir_freecount; /* count of free inodes (set bits) */ | |
53 | __be64 ir_free; /* free inode mask */ | |
54 | } xfs_inobt_rec_t; | |
55 | ||
56 | typedef struct xfs_inobt_rec_incore { | |
1da177e4 LT |
57 | xfs_agino_t ir_startino; /* starting inode number */ |
58 | __int32_t ir_freecount; /* count of free inodes (set bits) */ | |
59 | xfs_inofree_t ir_free; /* free inode mask */ | |
61a25848 CH |
60 | } xfs_inobt_rec_incore_t; |
61 | ||
1da177e4 LT |
62 | |
63 | /* | |
64 | * Key structure | |
65 | */ | |
61a25848 CH |
66 | typedef struct xfs_inobt_key { |
67 | __be32 ir_startino; /* starting inode number */ | |
1da177e4 LT |
68 | } xfs_inobt_key_t; |
69 | ||
16259e7d CH |
70 | /* btree pointer type */ |
71 | typedef __be32 xfs_inobt_ptr_t; | |
72 | ||
73 | /* btree block header type */ | |
1da177e4 LT |
74 | typedef struct xfs_btree_sblock xfs_inobt_block_t; |
75 | ||
a844f451 | 76 | #define XFS_BUF_TO_INOBT_BLOCK(bp) ((xfs_inobt_block_t *)XFS_BUF_PTR(bp)) |
1da177e4 LT |
77 | |
78 | /* | |
79 | * Bit manipulations for ir_free. | |
80 | */ | |
1da177e4 | 81 | #define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i)) |
a844f451 NS |
82 | #define XFS_INOBT_IS_FREE(rp,i) \ |
83 | (((rp)->ir_free & XFS_INOBT_MASK(i)) != 0) | |
1da177e4 | 84 | #define XFS_INOBT_SET_FREE(rp,i) ((rp)->ir_free |= XFS_INOBT_MASK(i)) |
1da177e4 | 85 | #define XFS_INOBT_CLR_FREE(rp,i) ((rp)->ir_free &= ~XFS_INOBT_MASK(i)) |
1da177e4 | 86 | |
1da177e4 LT |
87 | /* |
88 | * Maximum number of inode btree levels. | |
89 | */ | |
1da177e4 | 90 | #define XFS_IN_MAXLEVELS(mp) ((mp)->m_in_maxlevels) |
1da177e4 LT |
91 | |
92 | /* | |
93 | * block numbers in the AG. | |
94 | */ | |
a844f451 NS |
95 | #define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1)) |
96 | #define XFS_PREALLOC_BLOCKS(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1)) | |
1da177e4 LT |
97 | |
98 | /* | |
99 | * Record, key, and pointer address macros for btree blocks. | |
136341b4 CH |
100 | * |
101 | * (note that some of these may appear unused, but they are used in userspace) | |
1da177e4 | 102 | */ |
136341b4 CH |
103 | #define XFS_INOBT_REC_ADDR(mp, block, index) \ |
104 | ((xfs_inobt_rec_t *) \ | |
105 | ((char *)(block) + \ | |
106 | sizeof(struct xfs_btree_sblock) + \ | |
107 | (((index) - 1) * sizeof(xfs_inobt_rec_t)))) | |
108 | ||
109 | #define XFS_INOBT_KEY_ADDR(mp, block, index) \ | |
110 | ((xfs_inobt_key_t *) \ | |
111 | ((char *)(block) + \ | |
112 | sizeof(struct xfs_btree_sblock) + \ | |
113 | ((index) - 1) * sizeof(xfs_inobt_key_t))) | |
114 | ||
115 | #define XFS_INOBT_PTR_ADDR(mp, block, index, maxrecs) \ | |
116 | ((xfs_inobt_ptr_t *) \ | |
117 | ((char *)(block) + \ | |
118 | sizeof(struct xfs_btree_sblock) + \ | |
119 | (maxrecs) * sizeof(xfs_inobt_key_t) + \ | |
120 | ((index) - 1) * sizeof(xfs_inobt_ptr_t))) | |
1da177e4 | 121 | |
561f7d17 CH |
122 | extern struct xfs_btree_cur *xfs_inobt_init_cursor(struct xfs_mount *, |
123 | struct xfs_trans *, struct xfs_buf *, xfs_agnumber_t); | |
60197e8d | 124 | extern int xfs_inobt_maxrecs(struct xfs_mount *, int, int); |
561f7d17 | 125 | |
1da177e4 | 126 | #endif /* __XFS_IALLOC_BTREE_H__ */ |