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2bd0ea18 | 1 | /* |
f302e9e4 NS |
2 | * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
5000d01d | 4 | * |
f302e9e4 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 | |
2bd0ea18 | 7 | * published by the Free Software Foundation. |
5000d01d | 8 | * |
f302e9e4 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. | |
5000d01d | 13 | * |
f302e9e4 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 | |
2bd0ea18 NS |
17 | */ |
18 | #ifndef __XFS_AG_H__ | |
dfc130f3 | 19 | #define __XFS_AG_H__ |
2bd0ea18 NS |
20 | |
21 | /* | |
22 | * Allocation group header | |
5000d01d | 23 | * This is divided into three structures, placed in sequential 512-byte |
2bd0ea18 NS |
24 | * buffers after a copy of the superblock (also in a 512-byte buffer). |
25 | */ | |
26 | ||
27 | struct xfs_buf; | |
28 | struct xfs_mount; | |
3e535bba | 29 | struct xfs_trans; |
2bd0ea18 | 30 | |
dfc130f3 RC |
31 | #define XFS_AGF_MAGIC 0x58414746 /* 'XAGF' */ |
32 | #define XFS_AGI_MAGIC 0x58414749 /* 'XAGI' */ | |
dd5b876e | 33 | #define XFS_AGFL_MAGIC 0x5841464c /* 'XAFL' */ |
dfc130f3 RC |
34 | #define XFS_AGF_VERSION 1 |
35 | #define XFS_AGI_VERSION 1 | |
f302e9e4 NS |
36 | |
37 | #define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION) | |
38 | #define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION) | |
2bd0ea18 NS |
39 | |
40 | /* | |
41 | * Btree number 0 is bno, 1 is cnt. This value gives the size of the | |
42 | * arrays below. | |
43 | */ | |
dfc130f3 | 44 | #define XFS_BTNUM_AGF ((int)XFS_BTNUM_CNTi + 1) |
2bd0ea18 NS |
45 | |
46 | /* | |
47 | * The second word of agf_levels in the first a.g. overlaps the EFS | |
48 | * superblock's magic number. Since the magic numbers valid for EFS | |
49 | * are > 64k, our value cannot be confused for an EFS superblock's. | |
50 | */ | |
51 | ||
f302e9e4 | 52 | typedef struct xfs_agf { |
2bd0ea18 NS |
53 | /* |
54 | * Common allocation group header information | |
55 | */ | |
f302e9e4 NS |
56 | __be32 agf_magicnum; /* magic number == XFS_AGF_MAGIC */ |
57 | __be32 agf_versionnum; /* header version == XFS_AGF_VERSION */ | |
58 | __be32 agf_seqno; /* sequence # starting from 0 */ | |
59 | __be32 agf_length; /* size in blocks of a.g. */ | |
2bd0ea18 NS |
60 | /* |
61 | * Freespace information | |
62 | */ | |
f302e9e4 NS |
63 | __be32 agf_roots[XFS_BTNUM_AGF]; /* root blocks */ |
64 | __be32 agf_spare0; /* spare field */ | |
65 | __be32 agf_levels[XFS_BTNUM_AGF]; /* btree levels */ | |
66 | __be32 agf_spare1; /* spare field */ | |
dd5b876e | 67 | |
f302e9e4 NS |
68 | __be32 agf_flfirst; /* first freelist block's index */ |
69 | __be32 agf_fllast; /* last freelist block's index */ | |
70 | __be32 agf_flcount; /* count of blocks in freelist */ | |
71 | __be32 agf_freeblks; /* total free blocks */ | |
dd5b876e | 72 | |
f302e9e4 | 73 | __be32 agf_longest; /* longest free space */ |
cdded3d8 | 74 | __be32 agf_btreeblks; /* # of blocks held in AGF btrees */ |
dd5b876e DC |
75 | uuid_t agf_uuid; /* uuid of filesystem */ |
76 | ||
77 | /* | |
78 | * reserve some contiguous space for future logged fields before we add | |
79 | * the unlogged fields. This makes the range logging via flags and | |
80 | * structure offsets much simpler. | |
81 | */ | |
82 | __be64 agf_spare64[16]; | |
83 | ||
84 | /* unlogged fields, written during buffer writeback. */ | |
85 | __be64 agf_lsn; /* last write sequence */ | |
86 | __be32 agf_crc; /* crc of agf sector */ | |
87 | __be32 agf_spare2; | |
88 | ||
89 | /* structure must be padded to 64 bit alignment */ | |
2bd0ea18 NS |
90 | } xfs_agf_t; |
91 | ||
3faddc54 DC |
92 | #define XFS_AGF_CRC_OFF offsetof(struct xfs_agf, agf_crc) |
93 | ||
dfc130f3 RC |
94 | #define XFS_AGF_MAGICNUM 0x00000001 |
95 | #define XFS_AGF_VERSIONNUM 0x00000002 | |
96 | #define XFS_AGF_SEQNO 0x00000004 | |
97 | #define XFS_AGF_LENGTH 0x00000008 | |
98 | #define XFS_AGF_ROOTS 0x00000010 | |
99 | #define XFS_AGF_LEVELS 0x00000020 | |
100 | #define XFS_AGF_FLFIRST 0x00000040 | |
101 | #define XFS_AGF_FLLAST 0x00000080 | |
102 | #define XFS_AGF_FLCOUNT 0x00000100 | |
103 | #define XFS_AGF_FREEBLKS 0x00000200 | |
104 | #define XFS_AGF_LONGEST 0x00000400 | |
cdded3d8 | 105 | #define XFS_AGF_BTREEBLKS 0x00000800 |
dd5b876e | 106 | #define XFS_AGF_UUID 0x00001000 |
79737cd9 | 107 | #define XFS_AGF_NUM_BITS 13 |
dfc130f3 | 108 | #define XFS_AGF_ALL_BITS ((1 << XFS_AGF_NUM_BITS) - 1) |
2bd0ea18 | 109 | |
56b2de80 DC |
110 | #define XFS_AGF_FLAGS \ |
111 | { XFS_AGF_MAGICNUM, "MAGICNUM" }, \ | |
112 | { XFS_AGF_VERSIONNUM, "VERSIONNUM" }, \ | |
113 | { XFS_AGF_SEQNO, "SEQNO" }, \ | |
114 | { XFS_AGF_LENGTH, "LENGTH" }, \ | |
115 | { XFS_AGF_ROOTS, "ROOTS" }, \ | |
116 | { XFS_AGF_LEVELS, "LEVELS" }, \ | |
117 | { XFS_AGF_FLFIRST, "FLFIRST" }, \ | |
118 | { XFS_AGF_FLLAST, "FLLAST" }, \ | |
119 | { XFS_AGF_FLCOUNT, "FLCOUNT" }, \ | |
120 | { XFS_AGF_FREEBLKS, "FREEBLKS" }, \ | |
121 | { XFS_AGF_LONGEST, "LONGEST" }, \ | |
dd5b876e DC |
122 | { XFS_AGF_BTREEBLKS, "BTREEBLKS" }, \ |
123 | { XFS_AGF_UUID, "UUID" } | |
56b2de80 | 124 | |
2bd0ea18 | 125 | /* disk block (xfs_daddr_t) in the AG */ |
9440d84d | 126 | #define XFS_AGF_DADDR(mp) ((xfs_daddr_t)(1 << (mp)->m_sectbb_log)) |
f302e9e4 | 127 | #define XFS_AGF_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp)) |
a2ceac1f | 128 | #define XFS_BUF_TO_AGF(bp) ((xfs_agf_t *)((bp)->b_addr)) |
f302e9e4 | 129 | |
56b2de80 DC |
130 | extern int xfs_read_agf(struct xfs_mount *mp, struct xfs_trans *tp, |
131 | xfs_agnumber_t agno, int flags, struct xfs_buf **bpp); | |
2bd0ea18 NS |
132 | |
133 | /* | |
134 | * Size of the unlinked inode hash table in the agi. | |
135 | */ | |
dfc130f3 | 136 | #define XFS_AGI_UNLINKED_BUCKETS 64 |
2bd0ea18 | 137 | |
f302e9e4 | 138 | typedef struct xfs_agi { |
2bd0ea18 NS |
139 | /* |
140 | * Common allocation group header information | |
141 | */ | |
f302e9e4 NS |
142 | __be32 agi_magicnum; /* magic number == XFS_AGI_MAGIC */ |
143 | __be32 agi_versionnum; /* header version == XFS_AGI_VERSION */ | |
144 | __be32 agi_seqno; /* sequence # starting from 0 */ | |
145 | __be32 agi_length; /* size in blocks of a.g. */ | |
2bd0ea18 NS |
146 | /* |
147 | * Inode information | |
148 | * Inodes are mapped by interpreting the inode number, so no | |
149 | * mapping data is needed here. | |
150 | */ | |
f302e9e4 NS |
151 | __be32 agi_count; /* count of allocated inodes */ |
152 | __be32 agi_root; /* root of inode btree */ | |
153 | __be32 agi_level; /* levels in inode btree */ | |
154 | __be32 agi_freecount; /* number of free inodes */ | |
dd5b876e | 155 | |
f302e9e4 NS |
156 | __be32 agi_newino; /* new inode just allocated */ |
157 | __be32 agi_dirino; /* last directory inode chunk */ | |
2bd0ea18 NS |
158 | /* |
159 | * Hash table of inodes which have been unlinked but are | |
160 | * still being referenced. | |
161 | */ | |
f302e9e4 | 162 | __be32 agi_unlinked[XFS_AGI_UNLINKED_BUCKETS]; |
ff105f75 DC |
163 | /* |
164 | * This marks the end of logging region 1 and start of logging region 2. | |
165 | */ | |
dd5b876e DC |
166 | uuid_t agi_uuid; /* uuid of filesystem */ |
167 | __be32 agi_crc; /* crc of agi sector */ | |
168 | __be32 agi_pad32; | |
169 | __be64 agi_lsn; /* last write sequence */ | |
170 | ||
c0a4c227 BF |
171 | __be32 agi_free_root; /* root of the free inode btree */ |
172 | __be32 agi_free_level;/* levels in free inode btree */ | |
173 | ||
dd5b876e | 174 | /* structure must be padded to 64 bit alignment */ |
2bd0ea18 NS |
175 | } xfs_agi_t; |
176 | ||
3faddc54 DC |
177 | #define XFS_AGI_CRC_OFF offsetof(struct xfs_agi, agi_crc) |
178 | ||
c0a4c227 BF |
179 | #define XFS_AGI_MAGICNUM (1 << 0) |
180 | #define XFS_AGI_VERSIONNUM (1 << 1) | |
181 | #define XFS_AGI_SEQNO (1 << 2) | |
182 | #define XFS_AGI_LENGTH (1 << 3) | |
183 | #define XFS_AGI_COUNT (1 << 4) | |
184 | #define XFS_AGI_ROOT (1 << 5) | |
185 | #define XFS_AGI_LEVEL (1 << 6) | |
186 | #define XFS_AGI_FREECOUNT (1 << 7) | |
187 | #define XFS_AGI_NEWINO (1 << 8) | |
188 | #define XFS_AGI_DIRINO (1 << 9) | |
189 | #define XFS_AGI_UNLINKED (1 << 10) | |
190 | #define XFS_AGI_NUM_BITS_R1 11 /* end of the 1st agi logging region */ | |
191 | #define XFS_AGI_ALL_BITS_R1 ((1 << XFS_AGI_NUM_BITS_R1) - 1) | |
192 | #define XFS_AGI_FREE_ROOT (1 << 11) | |
193 | #define XFS_AGI_FREE_LEVEL (1 << 12) | |
194 | #define XFS_AGI_NUM_BITS_R2 13 | |
2bd0ea18 NS |
195 | |
196 | /* disk block (xfs_daddr_t) in the AG */ | |
9440d84d | 197 | #define XFS_AGI_DADDR(mp) ((xfs_daddr_t)(2 << (mp)->m_sectbb_log)) |
f302e9e4 | 198 | #define XFS_AGI_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp)) |
a2ceac1f | 199 | #define XFS_BUF_TO_AGI(bp) ((xfs_agi_t *)((bp)->b_addr)) |
2bd0ea18 | 200 | |
56b2de80 DC |
201 | extern int xfs_read_agi(struct xfs_mount *mp, struct xfs_trans *tp, |
202 | xfs_agnumber_t agno, struct xfs_buf **bpp); | |
203 | ||
2bd0ea18 | 204 | /* |
5000d01d | 205 | * The third a.g. block contains the a.g. freelist, an array |
2bd0ea18 NS |
206 | * of block pointers to blocks owned by the allocation btree code. |
207 | */ | |
9440d84d | 208 | #define XFS_AGFL_DADDR(mp) ((xfs_daddr_t)(3 << (mp)->m_sectbb_log)) |
f302e9e4 | 209 | #define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp)) |
a2ceac1f | 210 | #define XFS_BUF_TO_AGFL(bp) ((xfs_agfl_t *)((bp)->b_addr)) |
9440d84d | 211 | |
dd5b876e DC |
212 | #define XFS_BUF_TO_AGFL_BNO(mp, bp) \ |
213 | (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \ | |
214 | &(XFS_BUF_TO_AGFL(bp)->agfl_bno[0]) : \ | |
215 | (__be32 *)(bp)->b_addr) | |
216 | ||
217 | /* | |
218 | * Size of the AGFL. For CRC-enabled filesystes we steal a couple of | |
219 | * slots in the beginning of the block for a proper header with the | |
220 | * location information and CRC. | |
221 | */ | |
222 | #define XFS_AGFL_SIZE(mp) \ | |
223 | (((mp)->m_sb.sb_sectsize - \ | |
224 | (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \ | |
225 | sizeof(struct xfs_agfl) : 0)) / \ | |
226 | sizeof(xfs_agblock_t)) | |
227 | ||
9440d84d | 228 | typedef struct xfs_agfl { |
dd5b876e DC |
229 | __be32 agfl_magicnum; |
230 | __be32 agfl_seqno; | |
231 | uuid_t agfl_uuid; | |
232 | __be64 agfl_lsn; | |
233 | __be32 agfl_crc; | |
234 | __be32 agfl_bno[]; /* actually XFS_AGFL_SIZE(mp) */ | |
2bd0ea18 NS |
235 | } xfs_agfl_t; |
236 | ||
3faddc54 DC |
237 | #define XFS_AGFL_CRC_OFF offsetof(struct xfs_agfl, agfl_crc) |
238 | ||
56b2de80 DC |
239 | /* |
240 | * tags for inode radix tree | |
241 | */ | |
242 | #define XFS_ICI_NO_TAG (-1) /* special flag for an untagged lookup | |
243 | in xfs_inode_ag_iterator */ | |
244 | #define XFS_ICI_RECLAIM_TAG 0 /* inode is to be reclaimed */ | |
a2ceac1f | 245 | #define XFS_ICI_EOFBLOCKS_TAG 1 /* inode has blocks beyond EOF */ |
56b2de80 | 246 | |
f302e9e4 NS |
247 | #define XFS_AG_MAXLEVELS(mp) ((mp)->m_ag_maxlevels) |
248 | #define XFS_MIN_FREELIST_RAW(bl,cl,mp) \ | |
249 | (MIN(bl + 1, XFS_AG_MAXLEVELS(mp)) + MIN(cl + 1, XFS_AG_MAXLEVELS(mp))) | |
250 | #define XFS_MIN_FREELIST(a,mp) \ | |
251 | (XFS_MIN_FREELIST_RAW( \ | |
6e3140c7 NS |
252 | be32_to_cpu((a)->agf_levels[XFS_BTNUM_BNOi]), \ |
253 | be32_to_cpu((a)->agf_levels[XFS_BTNUM_CNTi]), mp)) | |
dfc130f3 | 254 | #define XFS_MIN_FREELIST_PAG(pag,mp) \ |
f302e9e4 | 255 | (XFS_MIN_FREELIST_RAW( \ |
56b2de80 DC |
256 | (unsigned int)(pag)->pagf_levels[XFS_BTNUM_BNOi], \ |
257 | (unsigned int)(pag)->pagf_levels[XFS_BTNUM_CNTi], mp)) | |
2bd0ea18 | 258 | |
f302e9e4 | 259 | #define XFS_AGB_TO_FSB(mp,agno,agbno) \ |
2bd0ea18 | 260 | (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno)) |
f302e9e4 | 261 | #define XFS_FSB_TO_AGNO(mp,fsbno) \ |
2bd0ea18 | 262 | ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog)) |
f302e9e4 | 263 | #define XFS_FSB_TO_AGBNO(mp,fsbno) \ |
56b2de80 | 264 | ((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog))) |
f302e9e4 NS |
265 | #define XFS_AGB_TO_DADDR(mp,agno,agbno) \ |
266 | ((xfs_daddr_t)XFS_FSB_TO_BB(mp, \ | |
267 | (xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno))) | |
268 | #define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d)) | |
2bd0ea18 NS |
269 | |
270 | /* | |
271 | * For checking for bad ranges of xfs_daddr_t's, covering multiple | |
272 | * allocation groups or a single xfs_daddr_t that's a superblock copy. | |
273 | */ | |
dfc130f3 | 274 | #define XFS_AG_CHECK_DADDR(mp,d,len) \ |
2bd0ea18 NS |
275 | ((len) == 1 ? \ |
276 | ASSERT((d) == XFS_SB_DADDR || \ | |
56b2de80 DC |
277 | xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \ |
278 | ASSERT(xfs_daddr_to_agno(mp, d) == \ | |
279 | xfs_daddr_to_agno(mp, (d) + (len) - 1))) | |
2bd0ea18 NS |
280 | |
281 | #endif /* __XFS_AG_H__ */ |