Root/
1 | /* |
2 | * Copyright (c) 2000,2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. |
4 | * |
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 |
7 | * published by the Free Software Foundation. |
8 | * |
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. |
13 | * |
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 |
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_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 | */ |
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 { |
46 | xfs_agblock_t ar_startblock; /* starting block number */ |
47 | xfs_extlen_t ar_blockcount; /* count of free blocks */ |
48 | } xfs_alloc_rec_incore_t; |
49 | |
50 | /* btree pointer type */ |
51 | typedef __be32 xfs_alloc_ptr_t; |
52 | |
53 | /* |
54 | * Minimum and maximum blocksize and sectorsize. |
55 | * The blocksize upper limit is pretty much arbitrary. |
56 | * The sectorsize upper limit is due to sizeof(sb_sectsize). |
57 | */ |
58 | #define XFS_MIN_BLOCKSIZE_LOG 9 /* i.e. 512 bytes */ |
59 | #define XFS_MAX_BLOCKSIZE_LOG 16 /* i.e. 65536 bytes */ |
60 | #define XFS_MIN_BLOCKSIZE (1 << XFS_MIN_BLOCKSIZE_LOG) |
61 | #define XFS_MAX_BLOCKSIZE (1 << XFS_MAX_BLOCKSIZE_LOG) |
62 | #define XFS_MIN_SECTORSIZE_LOG 9 /* i.e. 512 bytes */ |
63 | #define XFS_MAX_SECTORSIZE_LOG 15 /* i.e. 32768 bytes */ |
64 | #define XFS_MIN_SECTORSIZE (1 << XFS_MIN_SECTORSIZE_LOG) |
65 | #define XFS_MAX_SECTORSIZE (1 << XFS_MAX_SECTORSIZE_LOG) |
66 | |
67 | /* |
68 | * Block numbers in the AG: |
69 | * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3. |
70 | */ |
71 | #define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1)) |
72 | #define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1)) |
73 | |
74 | /* |
75 | * Btree block header size depends on a superblock flag. |
76 | * |
77 | * (not quite yet, but soon) |
78 | */ |
79 | #define XFS_ALLOC_BLOCK_LEN(mp) XFS_BTREE_SBLOCK_LEN |
80 | |
81 | /* |
82 | * Record, key, and pointer address macros for btree blocks. |
83 | * |
84 | * (note that some of these may appear unused, but they are used in userspace) |
85 | */ |
86 | #define XFS_ALLOC_REC_ADDR(mp, block, index) \ |
87 | ((xfs_alloc_rec_t *) \ |
88 | ((char *)(block) + \ |
89 | XFS_ALLOC_BLOCK_LEN(mp) + \ |
90 | (((index) - 1) * sizeof(xfs_alloc_rec_t)))) |
91 | |
92 | #define XFS_ALLOC_KEY_ADDR(mp, block, index) \ |
93 | ((xfs_alloc_key_t *) \ |
94 | ((char *)(block) + \ |
95 | XFS_ALLOC_BLOCK_LEN(mp) + \ |
96 | ((index) - 1) * sizeof(xfs_alloc_key_t))) |
97 | |
98 | #define XFS_ALLOC_PTR_ADDR(mp, block, index, maxrecs) \ |
99 | ((xfs_alloc_ptr_t *) \ |
100 | ((char *)(block) + \ |
101 | XFS_ALLOC_BLOCK_LEN(mp) + \ |
102 | (maxrecs) * sizeof(xfs_alloc_key_t) + \ |
103 | ((index) - 1) * sizeof(xfs_alloc_ptr_t))) |
104 | |
105 | extern struct xfs_btree_cur *xfs_allocbt_init_cursor(struct xfs_mount *, |
106 | struct xfs_trans *, struct xfs_buf *, |
107 | xfs_agnumber_t, xfs_btnum_t); |
108 | extern int xfs_allocbt_maxrecs(struct xfs_mount *, int, int); |
109 | |
110 | #endif /* __XFS_ALLOC_BTREE_H__ */ |
111 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9