Commit | Line | Data |
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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; | |
1da177e4 LT |
27 | struct xfs_mount; |
28 | ||
29 | /* | |
30 | * There is a btree for the inode map per allocation group. | |
31 | */ | |
ee1a47ab CH |
32 | #define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */ |
33 | #define XFS_IBT_CRC_MAGIC 0x49414233 /* 'IAB3' */ | |
1da177e4 LT |
34 | |
35 | typedef __uint64_t xfs_inofree_t; | |
0d87e656 | 36 | #define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t)) |
1da177e4 | 37 | #define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3) |
0d87e656 CH |
38 | #define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1) |
39 | #define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i)) | |
1da177e4 | 40 | |
a844f451 NS |
41 | static inline xfs_inofree_t xfs_inobt_maskn(int i, int n) |
42 | { | |
0d87e656 | 43 | return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i; |
a844f451 | 44 | } |
1da177e4 LT |
45 | |
46 | /* | |
47 | * Data record structure | |
48 | */ | |
61a25848 CH |
49 | typedef struct xfs_inobt_rec { |
50 | __be32 ir_startino; /* starting inode number */ | |
51 | __be32 ir_freecount; /* count of free inodes (set bits) */ | |
52 | __be64 ir_free; /* free inode mask */ | |
53 | } xfs_inobt_rec_t; | |
54 | ||
55 | typedef struct xfs_inobt_rec_incore { | |
1da177e4 LT |
56 | xfs_agino_t ir_startino; /* starting inode number */ |
57 | __int32_t ir_freecount; /* count of free inodes (set bits) */ | |
58 | xfs_inofree_t ir_free; /* free inode mask */ | |
61a25848 CH |
59 | } xfs_inobt_rec_incore_t; |
60 | ||
1da177e4 LT |
61 | |
62 | /* | |
63 | * Key structure | |
64 | */ | |
61a25848 CH |
65 | typedef struct xfs_inobt_key { |
66 | __be32 ir_startino; /* starting inode number */ | |
1da177e4 LT |
67 | } xfs_inobt_key_t; |
68 | ||
16259e7d CH |
69 | /* btree pointer type */ |
70 | typedef __be32 xfs_inobt_ptr_t; | |
71 | ||
1da177e4 LT |
72 | /* |
73 | * block numbers in the AG. | |
74 | */ | |
a844f451 NS |
75 | #define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1)) |
76 | #define XFS_PREALLOC_BLOCKS(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1)) | |
1da177e4 | 77 | |
7cc95a82 CH |
78 | /* |
79 | * Btree block header size depends on a superblock flag. | |
7cc95a82 | 80 | */ |
ee1a47ab CH |
81 | #define XFS_INOBT_BLOCK_LEN(mp) \ |
82 | (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \ | |
83 | XFS_BTREE_SBLOCK_CRC_LEN : XFS_BTREE_SBLOCK_LEN) | |
7cc95a82 | 84 | |
1da177e4 LT |
85 | /* |
86 | * Record, key, and pointer address macros for btree blocks. | |
136341b4 CH |
87 | * |
88 | * (note that some of these may appear unused, but they are used in userspace) | |
1da177e4 | 89 | */ |
136341b4 CH |
90 | #define XFS_INOBT_REC_ADDR(mp, block, index) \ |
91 | ((xfs_inobt_rec_t *) \ | |
92 | ((char *)(block) + \ | |
7cc95a82 | 93 | XFS_INOBT_BLOCK_LEN(mp) + \ |
136341b4 CH |
94 | (((index) - 1) * sizeof(xfs_inobt_rec_t)))) |
95 | ||
96 | #define XFS_INOBT_KEY_ADDR(mp, block, index) \ | |
97 | ((xfs_inobt_key_t *) \ | |
98 | ((char *)(block) + \ | |
7cc95a82 | 99 | XFS_INOBT_BLOCK_LEN(mp) + \ |
136341b4 CH |
100 | ((index) - 1) * sizeof(xfs_inobt_key_t))) |
101 | ||
102 | #define XFS_INOBT_PTR_ADDR(mp, block, index, maxrecs) \ | |
103 | ((xfs_inobt_ptr_t *) \ | |
104 | ((char *)(block) + \ | |
7cc95a82 | 105 | XFS_INOBT_BLOCK_LEN(mp) + \ |
136341b4 CH |
106 | (maxrecs) * sizeof(xfs_inobt_key_t) + \ |
107 | ((index) - 1) * sizeof(xfs_inobt_ptr_t))) | |
1da177e4 | 108 | |
561f7d17 CH |
109 | extern struct xfs_btree_cur *xfs_inobt_init_cursor(struct xfs_mount *, |
110 | struct xfs_trans *, struct xfs_buf *, xfs_agnumber_t); | |
60197e8d | 111 | extern int xfs_inobt_maxrecs(struct xfs_mount *, int, int); |
561f7d17 | 112 | |
1813dd64 DC |
113 | extern const struct xfs_buf_ops xfs_inobt_buf_ops; |
114 | ||
1da177e4 | 115 | #endif /* __XFS_IALLOC_BTREE_H__ */ |