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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; | |
1da177e4 LT |
27 | struct xfs_mount; |
28 | ||
29 | /* | |
30 | * There are two on-disk btrees, one sorted by blockno and one sorted | |
31 | * by blockcount and blockno. All blocks look the same to make the code | |
32 | * simpler; if we have time later, we'll make the optimizations. | |
33 | */ | |
34 | #define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */ | |
35 | #define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */ | |
36 | ||
37 | /* | |
38 | * Data record/key structure | |
39 | */ | |
16259e7d CH |
40 | typedef struct xfs_alloc_rec { |
41 | __be32 ar_startblock; /* starting block number */ | |
42 | __be32 ar_blockcount; /* count of free blocks */ | |
43 | } xfs_alloc_rec_t, xfs_alloc_key_t; | |
44 | ||
45 | typedef struct xfs_alloc_rec_incore { | |
1da177e4 LT |
46 | xfs_agblock_t ar_startblock; /* starting block number */ |
47 | xfs_extlen_t ar_blockcount; /* count of free blocks */ | |
16259e7d | 48 | } xfs_alloc_rec_incore_t; |
1da177e4 | 49 | |
16259e7d CH |
50 | /* btree pointer type */ |
51 | typedef __be32 xfs_alloc_ptr_t; | |
1da177e4 | 52 | |
1da177e4 LT |
53 | /* |
54 | * Block numbers in the AG: | |
55 | * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3. | |
56 | */ | |
1da177e4 | 57 | #define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1)) |
1da177e4 | 58 | #define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1)) |
1da177e4 | 59 | |
7cc95a82 CH |
60 | /* |
61 | * Btree block header size depends on a superblock flag. | |
62 | * | |
63 | * (not quite yet, but soon) | |
64 | */ | |
65 | #define XFS_ALLOC_BLOCK_LEN(mp) XFS_BTREE_SBLOCK_LEN | |
66 | ||
1da177e4 LT |
67 | /* |
68 | * Record, key, and pointer address macros for btree blocks. | |
136341b4 CH |
69 | * |
70 | * (note that some of these may appear unused, but they are used in userspace) | |
1da177e4 | 71 | */ |
136341b4 CH |
72 | #define XFS_ALLOC_REC_ADDR(mp, block, index) \ |
73 | ((xfs_alloc_rec_t *) \ | |
74 | ((char *)(block) + \ | |
7cc95a82 | 75 | XFS_ALLOC_BLOCK_LEN(mp) + \ |
136341b4 | 76 | (((index) - 1) * sizeof(xfs_alloc_rec_t)))) |
1da177e4 | 77 | |
136341b4 CH |
78 | #define XFS_ALLOC_KEY_ADDR(mp, block, index) \ |
79 | ((xfs_alloc_key_t *) \ | |
80 | ((char *)(block) + \ | |
7cc95a82 | 81 | XFS_ALLOC_BLOCK_LEN(mp) + \ |
136341b4 | 82 | ((index) - 1) * sizeof(xfs_alloc_key_t))) |
1da177e4 | 83 | |
136341b4 CH |
84 | #define XFS_ALLOC_PTR_ADDR(mp, block, index, maxrecs) \ |
85 | ((xfs_alloc_ptr_t *) \ | |
86 | ((char *)(block) + \ | |
7cc95a82 | 87 | XFS_ALLOC_BLOCK_LEN(mp) + \ |
136341b4 CH |
88 | (maxrecs) * sizeof(xfs_alloc_key_t) + \ |
89 | ((index) - 1) * sizeof(xfs_alloc_ptr_t))) | |
561f7d17 CH |
90 | |
91 | extern struct xfs_btree_cur *xfs_allocbt_init_cursor(struct xfs_mount *, | |
92 | struct xfs_trans *, struct xfs_buf *, | |
93 | xfs_agnumber_t, xfs_btnum_t); | |
60197e8d | 94 | extern int xfs_allocbt_maxrecs(struct xfs_mount *, int, int); |
561f7d17 | 95 | |
1da177e4 | 96 | #endif /* __XFS_ALLOC_BTREE_H__ */ |