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1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
3 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
4 | * |
5 | * This copyrighted material is made available to anyone wishing to use, |
6 | * modify, copy, or redistribute it subject to the terms and conditions |
7 | * of the GNU General Public License v.2. |
8 | */ |
9 | |
10 | #ifndef __GFS2_ONDISK_DOT_H__ |
11 | #define __GFS2_ONDISK_DOT_H__ |
12 | |
13 | #include <linux/types.h> |
14 | |
15 | #define GFS2_MAGIC 0x01161970 |
16 | #define GFS2_BASIC_BLOCK 512 |
17 | #define GFS2_BASIC_BLOCK_SHIFT 9 |
18 | |
19 | /* Lock numbers of the LM_TYPE_NONDISK type */ |
20 | |
21 | #define GFS2_MOUNT_LOCK 0 |
22 | #define GFS2_LIVE_LOCK 1 |
23 | #define GFS2_TRANS_LOCK 2 |
24 | #define GFS2_RENAME_LOCK 3 |
25 | |
26 | /* Format numbers for various metadata types */ |
27 | |
28 | #define GFS2_FORMAT_NONE 0 |
29 | #define GFS2_FORMAT_SB 100 |
30 | #define GFS2_FORMAT_RG 200 |
31 | #define GFS2_FORMAT_RB 300 |
32 | #define GFS2_FORMAT_DI 400 |
33 | #define GFS2_FORMAT_IN 500 |
34 | #define GFS2_FORMAT_LF 600 |
35 | #define GFS2_FORMAT_JD 700 |
36 | #define GFS2_FORMAT_LH 800 |
37 | #define GFS2_FORMAT_LD 900 |
38 | #define GFS2_FORMAT_LB 1000 |
39 | #define GFS2_FORMAT_EA 1600 |
40 | #define GFS2_FORMAT_ED 1700 |
41 | #define GFS2_FORMAT_QC 1400 |
42 | /* These are format numbers for entities contained in files */ |
43 | #define GFS2_FORMAT_RI 1100 |
44 | #define GFS2_FORMAT_DE 1200 |
45 | #define GFS2_FORMAT_QU 1500 |
46 | /* These are part of the superblock */ |
47 | #define GFS2_FORMAT_FS 1801 |
48 | #define GFS2_FORMAT_MULTI 1900 |
49 | |
50 | /* |
51 | * An on-disk inode number |
52 | */ |
53 | |
54 | struct gfs2_inum { |
55 | __be64 no_formal_ino; |
56 | __be64 no_addr; |
57 | }; |
58 | |
59 | /* |
60 | * Generic metadata head structure |
61 | * Every inplace buffer logged in the journal must start with this. |
62 | */ |
63 | |
64 | #define GFS2_METATYPE_NONE 0 |
65 | #define GFS2_METATYPE_SB 1 |
66 | #define GFS2_METATYPE_RG 2 |
67 | #define GFS2_METATYPE_RB 3 |
68 | #define GFS2_METATYPE_DI 4 |
69 | #define GFS2_METATYPE_IN 5 |
70 | #define GFS2_METATYPE_LF 6 |
71 | #define GFS2_METATYPE_JD 7 |
72 | #define GFS2_METATYPE_LH 8 |
73 | #define GFS2_METATYPE_LD 9 |
74 | #define GFS2_METATYPE_LB 12 |
75 | #define GFS2_METATYPE_EA 10 |
76 | #define GFS2_METATYPE_ED 11 |
77 | #define GFS2_METATYPE_QC 14 |
78 | |
79 | struct gfs2_meta_header { |
80 | __be32 mh_magic; |
81 | __be32 mh_type; |
82 | __be64 __pad0; /* Was generation number in gfs1 */ |
83 | __be32 mh_format; |
84 | /* This union is to keep userspace happy */ |
85 | union { |
86 | __be32 mh_jid; /* Was incarnation number in gfs1 */ |
87 | __be32 __pad1; |
88 | }; |
89 | }; |
90 | |
91 | /* |
92 | * super-block structure |
93 | * |
94 | * It's probably good if SIZEOF_SB <= GFS2_BASIC_BLOCK (512 bytes) |
95 | * |
96 | * Order is important, need to be able to read old superblocks to do on-disk |
97 | * version upgrades. |
98 | */ |
99 | |
100 | /* Address of superblock in GFS2 basic blocks */ |
101 | #define GFS2_SB_ADDR 128 |
102 | |
103 | /* The lock number for the superblock (must be zero) */ |
104 | #define GFS2_SB_LOCK 0 |
105 | |
106 | /* Requirement: GFS2_LOCKNAME_LEN % 8 == 0 |
107 | Includes: the fencing zero at the end */ |
108 | #define GFS2_LOCKNAME_LEN 64 |
109 | |
110 | struct gfs2_sb { |
111 | struct gfs2_meta_header sb_header; |
112 | |
113 | __be32 sb_fs_format; |
114 | __be32 sb_multihost_format; |
115 | __u32 __pad0; /* Was superblock flags in gfs1 */ |
116 | |
117 | __be32 sb_bsize; |
118 | __be32 sb_bsize_shift; |
119 | __u32 __pad1; /* Was journal segment size in gfs1 */ |
120 | |
121 | struct gfs2_inum sb_master_dir; /* Was jindex dinode in gfs1 */ |
122 | struct gfs2_inum __pad2; /* Was rindex dinode in gfs1 */ |
123 | struct gfs2_inum sb_root_dir; |
124 | |
125 | char sb_lockproto[GFS2_LOCKNAME_LEN]; |
126 | char sb_locktable[GFS2_LOCKNAME_LEN]; |
127 | |
128 | struct gfs2_inum __pad3; /* Was quota inode in gfs1 */ |
129 | struct gfs2_inum __pad4; /* Was licence inode in gfs1 */ |
130 | #define GFS2_HAS_UUID 1 |
131 | __u8 sb_uuid[16]; /* The UUID, maybe 0 for backwards compat */ |
132 | }; |
133 | |
134 | /* |
135 | * resource index structure |
136 | */ |
137 | |
138 | struct gfs2_rindex { |
139 | __be64 ri_addr; /* grp block disk address */ |
140 | __be32 ri_length; /* length of rgrp header in fs blocks */ |
141 | __u32 __pad; |
142 | |
143 | __be64 ri_data0; /* first data location */ |
144 | __be32 ri_data; /* num of data blocks in rgrp */ |
145 | |
146 | __be32 ri_bitbytes; /* number of bytes in data bitmaps */ |
147 | |
148 | __u8 ri_reserved[64]; |
149 | }; |
150 | |
151 | /* |
152 | * resource group header structure |
153 | */ |
154 | |
155 | /* Number of blocks per byte in rgrp */ |
156 | #define GFS2_NBBY 4 |
157 | #define GFS2_BIT_SIZE 2 |
158 | #define GFS2_BIT_MASK 0x00000003 |
159 | |
160 | #define GFS2_BLKST_FREE 0 |
161 | #define GFS2_BLKST_USED 1 |
162 | #define GFS2_BLKST_UNLINKED 2 |
163 | #define GFS2_BLKST_DINODE 3 |
164 | |
165 | #define GFS2_RGF_JOURNAL 0x00000001 |
166 | #define GFS2_RGF_METAONLY 0x00000002 |
167 | #define GFS2_RGF_DATAONLY 0x00000004 |
168 | #define GFS2_RGF_NOALLOC 0x00000008 |
169 | |
170 | struct gfs2_rgrp { |
171 | struct gfs2_meta_header rg_header; |
172 | |
173 | __be32 rg_flags; |
174 | __be32 rg_free; |
175 | __be32 rg_dinodes; |
176 | __be32 __pad; |
177 | __be64 rg_igeneration; |
178 | |
179 | __u8 rg_reserved[80]; /* Several fields from gfs1 now reserved */ |
180 | }; |
181 | |
182 | /* |
183 | * quota structure |
184 | */ |
185 | |
186 | struct gfs2_quota { |
187 | __be64 qu_limit; |
188 | __be64 qu_warn; |
189 | __be64 qu_value; |
190 | __u8 qu_reserved[64]; |
191 | }; |
192 | |
193 | /* |
194 | * dinode structure |
195 | */ |
196 | |
197 | #define GFS2_MAX_META_HEIGHT 10 |
198 | #define GFS2_DIR_MAX_DEPTH 17 |
199 | |
200 | #define DT2IF(dt) (((dt) << 12) & S_IFMT) |
201 | #define IF2DT(sif) (((sif) & S_IFMT) >> 12) |
202 | |
203 | enum { |
204 | gfs2fl_Jdata = 0, |
205 | gfs2fl_ExHash = 1, |
206 | gfs2fl_Unused = 2, |
207 | gfs2fl_EaIndirect = 3, |
208 | gfs2fl_Directio = 4, |
209 | gfs2fl_Immutable = 5, |
210 | gfs2fl_AppendOnly = 6, |
211 | gfs2fl_NoAtime = 7, |
212 | gfs2fl_Sync = 8, |
213 | gfs2fl_System = 9, |
214 | gfs2fl_TruncInProg = 29, |
215 | gfs2fl_InheritDirectio = 30, |
216 | gfs2fl_InheritJdata = 31, |
217 | }; |
218 | |
219 | /* Dinode flags */ |
220 | #define GFS2_DIF_JDATA 0x00000001 |
221 | #define GFS2_DIF_EXHASH 0x00000002 |
222 | #define GFS2_DIF_UNUSED 0x00000004 /* only in gfs1 */ |
223 | #define GFS2_DIF_EA_INDIRECT 0x00000008 |
224 | #define GFS2_DIF_DIRECTIO 0x00000010 |
225 | #define GFS2_DIF_IMMUTABLE 0x00000020 |
226 | #define GFS2_DIF_APPENDONLY 0x00000040 |
227 | #define GFS2_DIF_NOATIME 0x00000080 |
228 | #define GFS2_DIF_SYNC 0x00000100 |
229 | #define GFS2_DIF_SYSTEM 0x00000200 /* New in gfs2 */ |
230 | #define GFS2_DIF_TRUNC_IN_PROG 0x20000000 /* New in gfs2 */ |
231 | #define GFS2_DIF_INHERIT_DIRECTIO 0x40000000 |
232 | #define GFS2_DIF_INHERIT_JDATA 0x80000000 |
233 | |
234 | struct gfs2_dinode { |
235 | struct gfs2_meta_header di_header; |
236 | |
237 | struct gfs2_inum di_num; |
238 | |
239 | __be32 di_mode; /* mode of file */ |
240 | __be32 di_uid; /* owner's user id */ |
241 | __be32 di_gid; /* owner's group id */ |
242 | __be32 di_nlink; /* number of links to this file */ |
243 | __be64 di_size; /* number of bytes in file */ |
244 | __be64 di_blocks; /* number of blocks in file */ |
245 | __be64 di_atime; /* time last accessed */ |
246 | __be64 di_mtime; /* time last modified */ |
247 | __be64 di_ctime; /* time last changed */ |
248 | __be32 di_major; /* device major number */ |
249 | __be32 di_minor; /* device minor number */ |
250 | |
251 | /* This section varies from gfs1. Padding added to align with |
252 | * remainder of dinode |
253 | */ |
254 | __be64 di_goal_meta; /* rgrp to alloc from next */ |
255 | __be64 di_goal_data; /* data block goal */ |
256 | __be64 di_generation; /* generation number for NFS */ |
257 | |
258 | __be32 di_flags; /* GFS2_DIF_... */ |
259 | __be32 di_payload_format; /* GFS2_FORMAT_... */ |
260 | __u16 __pad1; /* Was ditype in gfs1 */ |
261 | __be16 di_height; /* height of metadata */ |
262 | __u32 __pad2; /* Unused incarnation number from gfs1 */ |
263 | |
264 | /* These only apply to directories */ |
265 | __u16 __pad3; /* Padding */ |
266 | __be16 di_depth; /* Number of bits in the table */ |
267 | __be32 di_entries; /* The number of entries in the directory */ |
268 | |
269 | struct gfs2_inum __pad4; /* Unused even in current gfs1 */ |
270 | |
271 | __be64 di_eattr; /* extended attribute block number */ |
272 | __be32 di_atime_nsec; /* nsec portion of atime */ |
273 | __be32 di_mtime_nsec; /* nsec portion of mtime */ |
274 | __be32 di_ctime_nsec; /* nsec portion of ctime */ |
275 | |
276 | __u8 di_reserved[44]; |
277 | }; |
278 | |
279 | /* |
280 | * directory structure - many of these per directory file |
281 | */ |
282 | |
283 | #define GFS2_FNAMESIZE 255 |
284 | #define GFS2_DIRENT_SIZE(name_len) ((sizeof(struct gfs2_dirent) + (name_len) + 7) & ~7) |
285 | |
286 | struct gfs2_dirent { |
287 | struct gfs2_inum de_inum; |
288 | __be32 de_hash; |
289 | __be16 de_rec_len; |
290 | __be16 de_name_len; |
291 | __be16 de_type; |
292 | __u8 __pad[14]; |
293 | }; |
294 | |
295 | /* |
296 | * Header of leaf directory nodes |
297 | */ |
298 | |
299 | struct gfs2_leaf { |
300 | struct gfs2_meta_header lf_header; |
301 | |
302 | __be16 lf_depth; /* Depth of leaf */ |
303 | __be16 lf_entries; /* Number of dirents in leaf */ |
304 | __be32 lf_dirent_format; /* Format of the dirents */ |
305 | __be64 lf_next; /* Next leaf, if overflow */ |
306 | |
307 | __u8 lf_reserved[64]; |
308 | }; |
309 | |
310 | /* |
311 | * Extended attribute header format |
312 | * |
313 | * This works in a similar way to dirents. There is a fixed size header |
314 | * followed by a variable length section made up of the name and the |
315 | * associated data. In the case of a "stuffed" entry, the value is |
316 | * inline directly after the name, the ea_num_ptrs entry will be |
317 | * zero in that case. For non-"stuffed" entries, there will be |
318 | * a set of pointers (aligned to 8 byte boundary) to the block(s) |
319 | * containing the value. |
320 | * |
321 | * The blocks containing the values and the blocks containing the |
322 | * extended attribute headers themselves all start with the common |
323 | * metadata header. Each inode, if it has extended attributes, will |
324 | * have either a single block containing the extended attribute headers |
325 | * or a single indirect block pointing to blocks containing the |
326 | * extended attribure headers. |
327 | * |
328 | * The maximim size of the data part of an extended attribute is 64k |
329 | * so the number of blocks required depends upon block size. Since the |
330 | * block size also determines the number of pointers in an indirect |
331 | * block, its a fairly complicated calculation to work out the maximum |
332 | * number of blocks that an inode may have relating to extended attributes. |
333 | * |
334 | */ |
335 | |
336 | #define GFS2_EA_MAX_NAME_LEN 255 |
337 | #define GFS2_EA_MAX_DATA_LEN 65536 |
338 | |
339 | #define GFS2_EATYPE_UNUSED 0 |
340 | #define GFS2_EATYPE_USR 1 |
341 | #define GFS2_EATYPE_SYS 2 |
342 | #define GFS2_EATYPE_SECURITY 3 |
343 | |
344 | #define GFS2_EATYPE_LAST 3 |
345 | #define GFS2_EATYPE_VALID(x) ((x) <= GFS2_EATYPE_LAST) |
346 | |
347 | #define GFS2_EAFLAG_LAST 0x01 /* last ea in block */ |
348 | |
349 | struct gfs2_ea_header { |
350 | __be32 ea_rec_len; |
351 | __be32 ea_data_len; |
352 | __u8 ea_name_len; /* no NULL pointer after the string */ |
353 | __u8 ea_type; /* GFS2_EATYPE_... */ |
354 | __u8 ea_flags; /* GFS2_EAFLAG_... */ |
355 | __u8 ea_num_ptrs; |
356 | __u32 __pad; |
357 | }; |
358 | |
359 | /* |
360 | * Log header structure |
361 | */ |
362 | |
363 | #define GFS2_LOG_HEAD_UNMOUNT 0x00000001 /* log is clean */ |
364 | |
365 | struct gfs2_log_header { |
366 | struct gfs2_meta_header lh_header; |
367 | |
368 | __be64 lh_sequence; /* Sequence number of this transaction */ |
369 | __be32 lh_flags; /* GFS2_LOG_HEAD_... */ |
370 | __be32 lh_tail; /* Block number of log tail */ |
371 | __be32 lh_blkno; |
372 | __be32 lh_hash; |
373 | }; |
374 | |
375 | /* |
376 | * Log type descriptor |
377 | */ |
378 | |
379 | #define GFS2_LOG_DESC_METADATA 300 |
380 | /* ld_data1 is the number of metadata blocks in the descriptor. |
381 | ld_data2 is unused. */ |
382 | |
383 | #define GFS2_LOG_DESC_REVOKE 301 |
384 | /* ld_data1 is the number of revoke blocks in the descriptor. |
385 | ld_data2 is unused. */ |
386 | |
387 | #define GFS2_LOG_DESC_JDATA 302 |
388 | /* ld_data1 is the number of data blocks in the descriptor. |
389 | ld_data2 is unused. */ |
390 | |
391 | struct gfs2_log_descriptor { |
392 | struct gfs2_meta_header ld_header; |
393 | |
394 | __be32 ld_type; /* GFS2_LOG_DESC_... */ |
395 | __be32 ld_length; /* Number of buffers in this chunk */ |
396 | __be32 ld_data1; /* descriptor-specific field */ |
397 | __be32 ld_data2; /* descriptor-specific field */ |
398 | |
399 | __u8 ld_reserved[32]; |
400 | }; |
401 | |
402 | /* |
403 | * Inum Range |
404 | * Describe a range of formal inode numbers allocated to |
405 | * one machine to assign to inodes. |
406 | */ |
407 | |
408 | #define GFS2_INUM_QUANTUM 1048576 |
409 | |
410 | struct gfs2_inum_range { |
411 | __be64 ir_start; |
412 | __be64 ir_length; |
413 | }; |
414 | |
415 | /* |
416 | * Statfs change |
417 | * Describes an change to the pool of free and allocated |
418 | * blocks. |
419 | */ |
420 | |
421 | struct gfs2_statfs_change { |
422 | __be64 sc_total; |
423 | __be64 sc_free; |
424 | __be64 sc_dinodes; |
425 | }; |
426 | |
427 | /* |
428 | * Quota change |
429 | * Describes an allocation change for a particular |
430 | * user or group. |
431 | */ |
432 | |
433 | #define GFS2_QCF_USER 0x00000001 |
434 | |
435 | struct gfs2_quota_change { |
436 | __be64 qc_change; |
437 | __be32 qc_flags; /* GFS2_QCF_... */ |
438 | __be32 qc_id; |
439 | }; |
440 | |
441 | struct gfs2_quota_lvb { |
442 | __be32 qb_magic; |
443 | __u32 __pad; |
444 | __be64 qb_limit; /* Hard limit of # blocks to alloc */ |
445 | __be64 qb_warn; /* Warn user when alloc is above this # */ |
446 | __be64 qb_value; /* Current # blocks allocated */ |
447 | }; |
448 | |
449 | #endif /* __GFS2_ONDISK_DOT_H__ */ |
450 |
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