Commit | Line | Data |
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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' */ | |
77c95bba | 33 | #define XFS_AGFL_MAGIC 0x5841464c /* 'XAFL' */ |
1da177e4 LT |
34 | #define XFS_AGF_VERSION 1 |
35 | #define XFS_AGI_VERSION 1 | |
a844f451 NS |
36 | |
37 | #define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION) | |
38 | #define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION) | |
1da177e4 LT |
39 | |
40 | /* | |
41 | * Btree number 0 is bno, 1 is cnt. This value gives the size of the | |
42 | * arrays below. | |
43 | */ | |
44 | #define XFS_BTNUM_AGF ((int)XFS_BTNUM_CNTi + 1) | |
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 | ||
16259e7d | 52 | typedef struct xfs_agf { |
1da177e4 LT |
53 | /* |
54 | * Common allocation group header information | |
55 | */ | |
16259e7d CH |
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. */ | |
1da177e4 LT |
60 | /* |
61 | * Freespace information | |
62 | */ | |
16259e7d CH |
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 */ | |
4e0e6040 | 67 | |
16259e7d CH |
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 */ | |
4e0e6040 | 72 | |
16259e7d | 73 | __be32 agf_longest; /* longest free space */ |
92821e2b | 74 | __be32 agf_btreeblks; /* # of blocks held in AGF btrees */ |
4e0e6040 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 */ | |
1da177e4 LT |
90 | } xfs_agf_t; |
91 | ||
92 | #define XFS_AGF_MAGICNUM 0x00000001 | |
93 | #define XFS_AGF_VERSIONNUM 0x00000002 | |
94 | #define XFS_AGF_SEQNO 0x00000004 | |
95 | #define XFS_AGF_LENGTH 0x00000008 | |
96 | #define XFS_AGF_ROOTS 0x00000010 | |
97 | #define XFS_AGF_LEVELS 0x00000020 | |
98 | #define XFS_AGF_FLFIRST 0x00000040 | |
99 | #define XFS_AGF_FLLAST 0x00000080 | |
100 | #define XFS_AGF_FLCOUNT 0x00000100 | |
101 | #define XFS_AGF_FREEBLKS 0x00000200 | |
102 | #define XFS_AGF_LONGEST 0x00000400 | |
92821e2b | 103 | #define XFS_AGF_BTREEBLKS 0x00000800 |
4e0e6040 DC |
104 | #define XFS_AGF_UUID 0x00001000 |
105 | #define XFS_AGF_NUM_BITS 13 | |
1da177e4 LT |
106 | #define XFS_AGF_ALL_BITS ((1 << XFS_AGF_NUM_BITS) - 1) |
107 | ||
0b1b213f CH |
108 | #define XFS_AGF_FLAGS \ |
109 | { XFS_AGF_MAGICNUM, "MAGICNUM" }, \ | |
110 | { XFS_AGF_VERSIONNUM, "VERSIONNUM" }, \ | |
111 | { XFS_AGF_SEQNO, "SEQNO" }, \ | |
112 | { XFS_AGF_LENGTH, "LENGTH" }, \ | |
113 | { XFS_AGF_ROOTS, "ROOTS" }, \ | |
114 | { XFS_AGF_LEVELS, "LEVELS" }, \ | |
115 | { XFS_AGF_FLFIRST, "FLFIRST" }, \ | |
116 | { XFS_AGF_FLLAST, "FLLAST" }, \ | |
117 | { XFS_AGF_FLCOUNT, "FLCOUNT" }, \ | |
118 | { XFS_AGF_FREEBLKS, "FREEBLKS" }, \ | |
119 | { XFS_AGF_LONGEST, "LONGEST" }, \ | |
4e0e6040 DC |
120 | { XFS_AGF_BTREEBLKS, "BTREEBLKS" }, \ |
121 | { XFS_AGF_UUID, "UUID" } | |
0b1b213f | 122 | |
1da177e4 LT |
123 | /* disk block (xfs_daddr_t) in the AG */ |
124 | #define XFS_AGF_DADDR(mp) ((xfs_daddr_t)(1 << (mp)->m_sectbb_log)) | |
a844f451 | 125 | #define XFS_AGF_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp)) |
62926044 | 126 | #define XFS_BUF_TO_AGF(bp) ((xfs_agf_t *)((bp)->b_addr)) |
a844f451 | 127 | |
fef1111e ES |
128 | extern int xfs_read_agf(struct xfs_mount *mp, struct xfs_trans *tp, |
129 | xfs_agnumber_t agno, int flags, struct xfs_buf **bpp); | |
130 | ||
1813dd64 DC |
131 | extern const struct xfs_buf_ops xfs_agf_buf_ops; |
132 | ||
1da177e4 LT |
133 | /* |
134 | * Size of the unlinked inode hash table in the agi. | |
135 | */ | |
136 | #define XFS_AGI_UNLINKED_BUCKETS 64 | |
137 | ||
16259e7d | 138 | typedef struct xfs_agi { |
1da177e4 LT |
139 | /* |
140 | * Common allocation group header information | |
141 | */ | |
16259e7d CH |
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. */ | |
1da177e4 LT |
146 | /* |
147 | * Inode information | |
148 | * Inodes are mapped by interpreting the inode number, so no | |
149 | * mapping data is needed here. | |
150 | */ | |
16259e7d CH |
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 */ | |
983d09ff | 155 | |
16259e7d CH |
156 | __be32 agi_newino; /* new inode just allocated */ |
157 | __be32 agi_dirino; /* last directory inode chunk */ | |
1da177e4 LT |
158 | /* |
159 | * Hash table of inodes which have been unlinked but are | |
160 | * still being referenced. | |
161 | */ | |
16259e7d | 162 | __be32 agi_unlinked[XFS_AGI_UNLINKED_BUCKETS]; |
983d09ff DC |
163 | |
164 | uuid_t agi_uuid; /* uuid of filesystem */ | |
165 | __be32 agi_crc; /* crc of agi sector */ | |
166 | __be32 agi_pad32; | |
167 | __be64 agi_lsn; /* last write sequence */ | |
168 | ||
169 | /* structure must be padded to 64 bit alignment */ | |
1da177e4 LT |
170 | } xfs_agi_t; |
171 | ||
172 | #define XFS_AGI_MAGICNUM 0x00000001 | |
173 | #define XFS_AGI_VERSIONNUM 0x00000002 | |
174 | #define XFS_AGI_SEQNO 0x00000004 | |
175 | #define XFS_AGI_LENGTH 0x00000008 | |
176 | #define XFS_AGI_COUNT 0x00000010 | |
177 | #define XFS_AGI_ROOT 0x00000020 | |
178 | #define XFS_AGI_LEVEL 0x00000040 | |
179 | #define XFS_AGI_FREECOUNT 0x00000080 | |
180 | #define XFS_AGI_NEWINO 0x00000100 | |
181 | #define XFS_AGI_DIRINO 0x00000200 | |
182 | #define XFS_AGI_UNLINKED 0x00000400 | |
183 | #define XFS_AGI_NUM_BITS 11 | |
184 | #define XFS_AGI_ALL_BITS ((1 << XFS_AGI_NUM_BITS) - 1) | |
185 | ||
186 | /* disk block (xfs_daddr_t) in the AG */ | |
187 | #define XFS_AGI_DADDR(mp) ((xfs_daddr_t)(2 << (mp)->m_sectbb_log)) | |
a844f451 | 188 | #define XFS_AGI_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp)) |
62926044 | 189 | #define XFS_BUF_TO_AGI(bp) ((xfs_agi_t *)((bp)->b_addr)) |
1da177e4 | 190 | |
5e1be0fb CH |
191 | extern int xfs_read_agi(struct xfs_mount *mp, struct xfs_trans *tp, |
192 | xfs_agnumber_t agno, struct xfs_buf **bpp); | |
193 | ||
1813dd64 DC |
194 | extern const struct xfs_buf_ops xfs_agi_buf_ops; |
195 | ||
1da177e4 LT |
196 | /* |
197 | * The third a.g. block contains the a.g. freelist, an array | |
198 | * of block pointers to blocks owned by the allocation btree code. | |
199 | */ | |
200 | #define XFS_AGFL_DADDR(mp) ((xfs_daddr_t)(3 << (mp)->m_sectbb_log)) | |
a844f451 | 201 | #define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp)) |
62926044 | 202 | #define XFS_BUF_TO_AGFL(bp) ((xfs_agfl_t *)((bp)->b_addr)) |
1da177e4 | 203 | |
77c95bba CH |
204 | #define XFS_BUF_TO_AGFL_BNO(mp, bp) \ |
205 | (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \ | |
206 | &(XFS_BUF_TO_AGFL(bp)->agfl_bno[0]) : \ | |
207 | (__be32 *)(bp)->b_addr) | |
208 | ||
209 | /* | |
210 | * Size of the AGFL. For CRC-enabled filesystes we steal a couple of | |
211 | * slots in the beginning of the block for a proper header with the | |
212 | * location information and CRC. | |
213 | */ | |
214 | #define XFS_AGFL_SIZE(mp) \ | |
215 | (((mp)->m_sb.sb_sectsize - \ | |
216 | (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \ | |
217 | sizeof(struct xfs_agfl) : 0)) / \ | |
218 | sizeof(xfs_agblock_t)) | |
219 | ||
1da177e4 | 220 | typedef struct xfs_agfl { |
77c95bba CH |
221 | __be32 agfl_magicnum; |
222 | __be32 agfl_seqno; | |
223 | uuid_t agfl_uuid; | |
224 | __be64 agfl_lsn; | |
225 | __be32 agfl_crc; | |
226 | __be32 agfl_bno[]; /* actually XFS_AGFL_SIZE(mp) */ | |
1da177e4 LT |
227 | } xfs_agfl_t; |
228 | ||
1da177e4 LT |
229 | /* |
230 | * Per-ag incore structure, copies of information in agf and agi, | |
231 | * to improve the performance of allocation group selection. | |
1da177e4 | 232 | */ |
1da177e4 | 233 | #define XFS_PAGB_NUM_SLOTS 128 |
1da177e4 | 234 | |
aed3bb90 | 235 | typedef struct xfs_perag { |
0fa800fb DC |
236 | struct xfs_mount *pag_mount; /* owner filesystem */ |
237 | xfs_agnumber_t pag_agno; /* AG this structure belongs to */ | |
aed3bb90 | 238 | atomic_t pag_ref; /* perag reference count */ |
1da177e4 LT |
239 | char pagf_init; /* this agf's entry is initialized */ |
240 | char pagi_init; /* this agi's entry is initialized */ | |
c41564b5 | 241 | char pagf_metadata; /* the agf is preferred to be metadata */ |
1da177e4 LT |
242 | char pagi_inodeok; /* The agi is ok for inodes */ |
243 | __uint8_t pagf_levels[XFS_BTNUM_AGF]; | |
244 | /* # of levels in bno & cnt btree */ | |
245 | __uint32_t pagf_flcount; /* count of blocks in freelist */ | |
246 | xfs_extlen_t pagf_freeblks; /* total free blocks */ | |
247 | xfs_extlen_t pagf_longest; /* longest free space */ | |
92821e2b | 248 | __uint32_t pagf_btreeblks; /* # of blocks held in AGF btrees */ |
1da177e4 | 249 | xfs_agino_t pagi_freecount; /* number of free inodes */ |
92821e2b | 250 | xfs_agino_t pagi_count; /* number of allocated inodes */ |
bd169565 DC |
251 | |
252 | /* | |
253 | * Inode allocation search lookup optimisation. | |
254 | * If the pagino matches, the search for new inodes | |
255 | * doesn't need to search the near ones again straight away | |
256 | */ | |
257 | xfs_agino_t pagl_pagino; | |
258 | xfs_agino_t pagl_leftrec; | |
259 | xfs_agino_t pagl_rightrec; | |
1da177e4 | 260 | #ifdef __KERNEL__ |
ed3b4d6c DC |
261 | spinlock_t pagb_lock; /* lock for pagb_tree */ |
262 | struct rb_root pagb_tree; /* ordered tree of busy extents */ | |
847fff5c | 263 | |
2a82b8be | 264 | atomic_t pagf_fstrms; /* # of filestreams active in this AG */ |
da353b0d | 265 | |
1a427ab0 | 266 | spinlock_t pag_ici_lock; /* incore inode cache lock */ |
da353b0d | 267 | struct radix_tree_root pag_ici_root; /* incore inode cache root */ |
9bf729c0 | 268 | int pag_ici_reclaimable; /* reclaimable inodes */ |
69b491c2 DC |
269 | struct mutex pag_ici_reclaim_lock; /* serialisation point */ |
270 | unsigned long pag_ici_reclaim_cursor; /* reclaim restart point */ | |
e176579e | 271 | |
74f75a0c DC |
272 | /* buffer cache index */ |
273 | spinlock_t pag_buf_lock; /* lock for pag_buf_tree */ | |
274 | struct rb_root pag_buf_tree; /* ordered tree of active buffers */ | |
275 | ||
e176579e DC |
276 | /* for rcu-safe freeing */ |
277 | struct rcu_head rcu_head; | |
847fff5c | 278 | #endif |
e57336ff | 279 | int pagb_count; /* pagb slots in use */ |
1da177e4 LT |
280 | } xfs_perag_t; |
281 | ||
396beb85 DC |
282 | /* |
283 | * tags for inode radix tree | |
284 | */ | |
75f3cb13 DC |
285 | #define XFS_ICI_NO_TAG (-1) /* special flag for an untagged lookup |
286 | in xfs_inode_ag_iterator */ | |
396beb85 | 287 | #define XFS_ICI_RECLAIM_TAG 0 /* inode is to be reclaimed */ |
27b52867 | 288 | #define XFS_ICI_EOFBLOCKS_TAG 1 /* inode has blocks beyond EOF */ |
396beb85 | 289 | |
a844f451 NS |
290 | #define XFS_AG_MAXLEVELS(mp) ((mp)->m_ag_maxlevels) |
291 | #define XFS_MIN_FREELIST_RAW(bl,cl,mp) \ | |
292 | (MIN(bl + 1, XFS_AG_MAXLEVELS(mp)) + MIN(cl + 1, XFS_AG_MAXLEVELS(mp))) | |
293 | #define XFS_MIN_FREELIST(a,mp) \ | |
294 | (XFS_MIN_FREELIST_RAW( \ | |
16259e7d CH |
295 | be32_to_cpu((a)->agf_levels[XFS_BTNUM_BNOi]), \ |
296 | be32_to_cpu((a)->agf_levels[XFS_BTNUM_CNTi]), mp)) | |
1da177e4 | 297 | #define XFS_MIN_FREELIST_PAG(pag,mp) \ |
a844f451 | 298 | (XFS_MIN_FREELIST_RAW( \ |
a5687787 CH |
299 | (unsigned int)(pag)->pagf_levels[XFS_BTNUM_BNOi], \ |
300 | (unsigned int)(pag)->pagf_levels[XFS_BTNUM_CNTi], mp)) | |
1da177e4 | 301 | |
a844f451 | 302 | #define XFS_AGB_TO_FSB(mp,agno,agbno) \ |
1da177e4 | 303 | (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno)) |
a844f451 | 304 | #define XFS_FSB_TO_AGNO(mp,fsbno) \ |
1da177e4 | 305 | ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog)) |
a844f451 | 306 | #define XFS_FSB_TO_AGBNO(mp,fsbno) \ |
fb82557f | 307 | ((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog))) |
a844f451 NS |
308 | #define XFS_AGB_TO_DADDR(mp,agno,agbno) \ |
309 | ((xfs_daddr_t)XFS_FSB_TO_BB(mp, \ | |
310 | (xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno))) | |
311 | #define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d)) | |
1da177e4 LT |
312 | |
313 | /* | |
314 | * For checking for bad ranges of xfs_daddr_t's, covering multiple | |
315 | * allocation groups or a single xfs_daddr_t that's a superblock copy. | |
316 | */ | |
1da177e4 LT |
317 | #define XFS_AG_CHECK_DADDR(mp,d,len) \ |
318 | ((len) == 1 ? \ | |
319 | ASSERT((d) == XFS_SB_DADDR || \ | |
9d87c319 ES |
320 | xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \ |
321 | ASSERT(xfs_daddr_to_agno(mp, d) == \ | |
322 | xfs_daddr_to_agno(mp, (d) + (len) - 1))) | |
1da177e4 LT |
323 | |
324 | #endif /* __XFS_AG_H__ */ |