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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2003,2005 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_AG_H__ | |
19 | #define __XFS_AG_H__ | |
20 | ||
21 | /* | |
22 | * Allocation group header | |
23 | * This is divided into three structures, placed in sequential 512-byte | |
24 | * buffers after a copy of the superblock (also in a 512-byte buffer). | |
25 | */ | |
26 | ||
27 | struct xfs_buf; | |
28 | struct xfs_mount; | |
29 | struct xfs_trans; | |
30 | ||
31 | #define XFS_AGF_MAGIC 0x58414746 /* 'XAGF' */ | |
32 | #define XFS_AGI_MAGIC 0x58414749 /* 'XAGI' */ | |
33 | #define XFS_AGF_VERSION 1 | |
34 | #define XFS_AGI_VERSION 1 | |
a844f451 NS |
35 | |
36 | #define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION) | |
37 | #define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION) | |
1da177e4 LT |
38 | |
39 | /* | |
40 | * Btree number 0 is bno, 1 is cnt. This value gives the size of the | |
41 | * arrays below. | |
42 | */ | |
43 | #define XFS_BTNUM_AGF ((int)XFS_BTNUM_CNTi + 1) | |
44 | ||
45 | /* | |
46 | * The second word of agf_levels in the first a.g. overlaps the EFS | |
47 | * superblock's magic number. Since the magic numbers valid for EFS | |
48 | * are > 64k, our value cannot be confused for an EFS superblock's. | |
49 | */ | |
50 | ||
16259e7d | 51 | typedef struct xfs_agf { |
1da177e4 LT |
52 | /* |
53 | * Common allocation group header information | |
54 | */ | |
16259e7d CH |
55 | __be32 agf_magicnum; /* magic number == XFS_AGF_MAGIC */ |
56 | __be32 agf_versionnum; /* header version == XFS_AGF_VERSION */ | |
57 | __be32 agf_seqno; /* sequence # starting from 0 */ | |
58 | __be32 agf_length; /* size in blocks of a.g. */ | |
1da177e4 LT |
59 | /* |
60 | * Freespace information | |
61 | */ | |
16259e7d CH |
62 | __be32 agf_roots[XFS_BTNUM_AGF]; /* root blocks */ |
63 | __be32 agf_spare0; /* spare field */ | |
64 | __be32 agf_levels[XFS_BTNUM_AGF]; /* btree levels */ | |
65 | __be32 agf_spare1; /* spare field */ | |
66 | __be32 agf_flfirst; /* first freelist block's index */ | |
67 | __be32 agf_fllast; /* last freelist block's index */ | |
68 | __be32 agf_flcount; /* count of blocks in freelist */ | |
69 | __be32 agf_freeblks; /* total free blocks */ | |
70 | __be32 agf_longest; /* longest free space */ | |
92821e2b | 71 | __be32 agf_btreeblks; /* # of blocks held in AGF btrees */ |
1da177e4 LT |
72 | } xfs_agf_t; |
73 | ||
74 | #define XFS_AGF_MAGICNUM 0x00000001 | |
75 | #define XFS_AGF_VERSIONNUM 0x00000002 | |
76 | #define XFS_AGF_SEQNO 0x00000004 | |
77 | #define XFS_AGF_LENGTH 0x00000008 | |
78 | #define XFS_AGF_ROOTS 0x00000010 | |
79 | #define XFS_AGF_LEVELS 0x00000020 | |
80 | #define XFS_AGF_FLFIRST 0x00000040 | |
81 | #define XFS_AGF_FLLAST 0x00000080 | |
82 | #define XFS_AGF_FLCOUNT 0x00000100 | |
83 | #define XFS_AGF_FREEBLKS 0x00000200 | |
84 | #define XFS_AGF_LONGEST 0x00000400 | |
92821e2b DC |
85 | #define XFS_AGF_BTREEBLKS 0x00000800 |
86 | #define XFS_AGF_NUM_BITS 12 | |
1da177e4 LT |
87 | #define XFS_AGF_ALL_BITS ((1 << XFS_AGF_NUM_BITS) - 1) |
88 | ||
89 | /* disk block (xfs_daddr_t) in the AG */ | |
90 | #define XFS_AGF_DADDR(mp) ((xfs_daddr_t)(1 << (mp)->m_sectbb_log)) | |
a844f451 NS |
91 | #define XFS_AGF_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp)) |
92 | #define XFS_BUF_TO_AGF(bp) ((xfs_agf_t *)XFS_BUF_PTR(bp)) | |
93 | ||
1da177e4 LT |
94 | |
95 | /* | |
96 | * Size of the unlinked inode hash table in the agi. | |
97 | */ | |
98 | #define XFS_AGI_UNLINKED_BUCKETS 64 | |
99 | ||
16259e7d | 100 | typedef struct xfs_agi { |
1da177e4 LT |
101 | /* |
102 | * Common allocation group header information | |
103 | */ | |
16259e7d CH |
104 | __be32 agi_magicnum; /* magic number == XFS_AGI_MAGIC */ |
105 | __be32 agi_versionnum; /* header version == XFS_AGI_VERSION */ | |
106 | __be32 agi_seqno; /* sequence # starting from 0 */ | |
107 | __be32 agi_length; /* size in blocks of a.g. */ | |
1da177e4 LT |
108 | /* |
109 | * Inode information | |
110 | * Inodes are mapped by interpreting the inode number, so no | |
111 | * mapping data is needed here. | |
112 | */ | |
16259e7d CH |
113 | __be32 agi_count; /* count of allocated inodes */ |
114 | __be32 agi_root; /* root of inode btree */ | |
115 | __be32 agi_level; /* levels in inode btree */ | |
116 | __be32 agi_freecount; /* number of free inodes */ | |
117 | __be32 agi_newino; /* new inode just allocated */ | |
118 | __be32 agi_dirino; /* last directory inode chunk */ | |
1da177e4 LT |
119 | /* |
120 | * Hash table of inodes which have been unlinked but are | |
121 | * still being referenced. | |
122 | */ | |
16259e7d | 123 | __be32 agi_unlinked[XFS_AGI_UNLINKED_BUCKETS]; |
1da177e4 LT |
124 | } xfs_agi_t; |
125 | ||
126 | #define XFS_AGI_MAGICNUM 0x00000001 | |
127 | #define XFS_AGI_VERSIONNUM 0x00000002 | |
128 | #define XFS_AGI_SEQNO 0x00000004 | |
129 | #define XFS_AGI_LENGTH 0x00000008 | |
130 | #define XFS_AGI_COUNT 0x00000010 | |
131 | #define XFS_AGI_ROOT 0x00000020 | |
132 | #define XFS_AGI_LEVEL 0x00000040 | |
133 | #define XFS_AGI_FREECOUNT 0x00000080 | |
134 | #define XFS_AGI_NEWINO 0x00000100 | |
135 | #define XFS_AGI_DIRINO 0x00000200 | |
136 | #define XFS_AGI_UNLINKED 0x00000400 | |
137 | #define XFS_AGI_NUM_BITS 11 | |
138 | #define XFS_AGI_ALL_BITS ((1 << XFS_AGI_NUM_BITS) - 1) | |
139 | ||
140 | /* disk block (xfs_daddr_t) in the AG */ | |
141 | #define XFS_AGI_DADDR(mp) ((xfs_daddr_t)(2 << (mp)->m_sectbb_log)) | |
a844f451 NS |
142 | #define XFS_AGI_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp)) |
143 | #define XFS_BUF_TO_AGI(bp) ((xfs_agi_t *)XFS_BUF_PTR(bp)) | |
1da177e4 LT |
144 | |
145 | /* | |
146 | * The third a.g. block contains the a.g. freelist, an array | |
147 | * of block pointers to blocks owned by the allocation btree code. | |
148 | */ | |
149 | #define XFS_AGFL_DADDR(mp) ((xfs_daddr_t)(3 << (mp)->m_sectbb_log)) | |
a844f451 | 150 | #define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp)) |
1da177e4 | 151 | #define XFS_AGFL_SIZE(mp) ((mp)->m_sb.sb_sectsize / sizeof(xfs_agblock_t)) |
a844f451 | 152 | #define XFS_BUF_TO_AGFL(bp) ((xfs_agfl_t *)XFS_BUF_PTR(bp)) |
1da177e4 LT |
153 | |
154 | typedef struct xfs_agfl { | |
e2101005 | 155 | __be32 agfl_bno[1]; /* actually XFS_AGFL_SIZE(mp) */ |
1da177e4 LT |
156 | } xfs_agfl_t; |
157 | ||
158 | /* | |
159 | * Busy block/extent entry. Used in perag to mark blocks that have been freed | |
160 | * but whose transactions aren't committed to disk yet. | |
161 | */ | |
162 | typedef struct xfs_perag_busy { | |
163 | xfs_agblock_t busy_start; | |
164 | xfs_extlen_t busy_length; | |
165 | struct xfs_trans *busy_tp; /* transaction that did the free */ | |
166 | } xfs_perag_busy_t; | |
167 | ||
168 | /* | |
169 | * Per-ag incore structure, copies of information in agf and agi, | |
170 | * to improve the performance of allocation group selection. | |
171 | * | |
172 | * pick sizes which fit in allocation buckets well | |
173 | */ | |
174 | #if (BITS_PER_LONG == 32) | |
175 | #define XFS_PAGB_NUM_SLOTS 84 | |
176 | #elif (BITS_PER_LONG == 64) | |
177 | #define XFS_PAGB_NUM_SLOTS 128 | |
178 | #endif | |
179 | ||
180 | typedef struct xfs_perag | |
181 | { | |
182 | char pagf_init; /* this agf's entry is initialized */ | |
183 | char pagi_init; /* this agi's entry is initialized */ | |
c41564b5 | 184 | char pagf_metadata; /* the agf is preferred to be metadata */ |
1da177e4 LT |
185 | char pagi_inodeok; /* The agi is ok for inodes */ |
186 | __uint8_t pagf_levels[XFS_BTNUM_AGF]; | |
187 | /* # of levels in bno & cnt btree */ | |
188 | __uint32_t pagf_flcount; /* count of blocks in freelist */ | |
189 | xfs_extlen_t pagf_freeblks; /* total free blocks */ | |
190 | xfs_extlen_t pagf_longest; /* longest free space */ | |
92821e2b | 191 | __uint32_t pagf_btreeblks; /* # of blocks held in AGF btrees */ |
1da177e4 | 192 | xfs_agino_t pagi_freecount; /* number of free inodes */ |
92821e2b DC |
193 | xfs_agino_t pagi_count; /* number of allocated inodes */ |
194 | int pagb_count; /* pagb slots in use */ | |
1da177e4 LT |
195 | #ifdef __KERNEL__ |
196 | lock_t pagb_lock; /* lock for pagb_list */ | |
197 | #endif | |
1da177e4 LT |
198 | xfs_perag_busy_t *pagb_list; /* unstable blocks */ |
199 | } xfs_perag_t; | |
200 | ||
a844f451 NS |
201 | #define XFS_AG_MAXLEVELS(mp) ((mp)->m_ag_maxlevels) |
202 | #define XFS_MIN_FREELIST_RAW(bl,cl,mp) \ | |
203 | (MIN(bl + 1, XFS_AG_MAXLEVELS(mp)) + MIN(cl + 1, XFS_AG_MAXLEVELS(mp))) | |
204 | #define XFS_MIN_FREELIST(a,mp) \ | |
205 | (XFS_MIN_FREELIST_RAW( \ | |
16259e7d CH |
206 | be32_to_cpu((a)->agf_levels[XFS_BTNUM_BNOi]), \ |
207 | be32_to_cpu((a)->agf_levels[XFS_BTNUM_CNTi]), mp)) | |
1da177e4 | 208 | #define XFS_MIN_FREELIST_PAG(pag,mp) \ |
a844f451 NS |
209 | (XFS_MIN_FREELIST_RAW( \ |
210 | (uint_t)(pag)->pagf_levels[XFS_BTNUM_BNOi], \ | |
211 | (uint_t)(pag)->pagf_levels[XFS_BTNUM_CNTi], mp)) | |
1da177e4 | 212 | |
a844f451 | 213 | #define XFS_AGB_TO_FSB(mp,agno,agbno) \ |
1da177e4 | 214 | (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno)) |
a844f451 | 215 | #define XFS_FSB_TO_AGNO(mp,fsbno) \ |
1da177e4 | 216 | ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog)) |
a844f451 | 217 | #define XFS_FSB_TO_AGBNO(mp,fsbno) \ |
1da177e4 | 218 | ((xfs_agblock_t)((fsbno) & XFS_MASK32LO((mp)->m_sb.sb_agblklog))) |
a844f451 NS |
219 | #define XFS_AGB_TO_DADDR(mp,agno,agbno) \ |
220 | ((xfs_daddr_t)XFS_FSB_TO_BB(mp, \ | |
221 | (xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno))) | |
222 | #define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d)) | |
1da177e4 LT |
223 | |
224 | /* | |
225 | * For checking for bad ranges of xfs_daddr_t's, covering multiple | |
226 | * allocation groups or a single xfs_daddr_t that's a superblock copy. | |
227 | */ | |
1da177e4 LT |
228 | #define XFS_AG_CHECK_DADDR(mp,d,len) \ |
229 | ((len) == 1 ? \ | |
230 | ASSERT((d) == XFS_SB_DADDR || \ | |
231 | XFS_DADDR_TO_AGBNO(mp, d) != XFS_SB_DADDR) : \ | |
232 | ASSERT(XFS_DADDR_TO_AGNO(mp, d) == \ | |
233 | XFS_DADDR_TO_AGNO(mp, (d) + (len) - 1))) | |
1da177e4 LT |
234 | |
235 | #endif /* __XFS_AG_H__ */ |