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 #define GFS2_MAGIC 0x01161970
14 #define GFS2_BASIC_BLOCK 512
15 #define GFS2_BASIC_BLOCK_SHIFT 9
16
17 /* Lock numbers of the LM_TYPE_NONDISK type */
18
19 #define GFS2_MOUNT_LOCK 0
20 #define GFS2_LIVE_LOCK 1
21 #define GFS2_TRANS_LOCK 2
22 #define GFS2_RENAME_LOCK 3
23
24 /* Format numbers for various metadata types */
25
26 #define GFS2_FORMAT_NONE 0
27 #define GFS2_FORMAT_SB 100
28 #define GFS2_FORMAT_RG 200
29 #define GFS2_FORMAT_RB 300
30 #define GFS2_FORMAT_DI 400
31 #define GFS2_FORMAT_IN 500
32 #define GFS2_FORMAT_LF 600
33 #define GFS2_FORMAT_JD 700
34 #define GFS2_FORMAT_LH 800
35 #define GFS2_FORMAT_LD 900
36 #define GFS2_FORMAT_LB 1000
37 #define GFS2_FORMAT_EA 1600
38 #define GFS2_FORMAT_ED 1700
39 #define GFS2_FORMAT_QC 1400
40 /* These are format numbers for entities contained in files */
41 #define GFS2_FORMAT_RI 1100
42 #define GFS2_FORMAT_DE 1200
43 #define GFS2_FORMAT_QU 1500
44 /* These are part of the superblock */
45 #define GFS2_FORMAT_FS 1801
46 #define GFS2_FORMAT_MULTI 1900
47
48 /*
49 * An on-disk inode number
50 */
51
52 struct gfs2_inum {
53 __be64 no_formal_ino;
54 __be64 no_addr;
55 };
56
57 /*
58 * Generic metadata head structure
59 * Every inplace buffer logged in the journal must start with this.
60 */
61
62 #define GFS2_METATYPE_NONE 0
63 #define GFS2_METATYPE_SB 1
64 #define GFS2_METATYPE_RG 2
65 #define GFS2_METATYPE_RB 3
66 #define GFS2_METATYPE_DI 4
67 #define GFS2_METATYPE_IN 5
68 #define GFS2_METATYPE_LF 6
69 #define GFS2_METATYPE_JD 7
70 #define GFS2_METATYPE_LH 8
71 #define GFS2_METATYPE_LD 9
72 #define GFS2_METATYPE_LB 12
73 #define GFS2_METATYPE_EA 10
74 #define GFS2_METATYPE_ED 11
75 #define GFS2_METATYPE_QC 14
76
77 struct gfs2_meta_header {
78 __be32 mh_magic;
79 __be32 mh_type;
80 __be64 __pad0; /* Was generation number in gfs1 */
81 __be32 mh_format;
82 __be32 __pad1; /* Was incarnation number in gfs1 */
83 };
84
85 /*
86 * super-block structure
87 *
88 * It's probably good if SIZEOF_SB <= GFS2_BASIC_BLOCK (512 bytes)
89 *
90 * Order is important, need to be able to read old superblocks to do on-disk
91 * version upgrades.
92 */
93
94 /* Address of superblock in GFS2 basic blocks */
95 #define GFS2_SB_ADDR 128
96
97 /* The lock number for the superblock (must be zero) */
98 #define GFS2_SB_LOCK 0
99
100 /* Requirement: GFS2_LOCKNAME_LEN % 8 == 0
101 Includes: the fencing zero at the end */
102 #define GFS2_LOCKNAME_LEN 64
103
104 struct gfs2_sb {
105 struct gfs2_meta_header sb_header;
106
107 __be32 sb_fs_format;
108 __be32 sb_multihost_format;
109 __u32 __pad0; /* Was superblock flags in gfs1 */
110
111 __be32 sb_bsize;
112 __be32 sb_bsize_shift;
113 __u32 __pad1; /* Was journal segment size in gfs1 */
114
115 struct gfs2_inum sb_master_dir; /* Was jindex dinode in gfs1 */
116 struct gfs2_inum __pad2; /* Was rindex dinode in gfs1 */
117 struct gfs2_inum sb_root_dir;
118
119 char sb_lockproto[GFS2_LOCKNAME_LEN];
120 char sb_locktable[GFS2_LOCKNAME_LEN];
121 /* In gfs1, quota and license dinodes followed */
122 };
123
124 /*
125 * resource index structure
126 */
127
128 struct gfs2_rindex {
129 __be64 ri_addr; /* grp block disk address */
130 __be32 ri_length; /* length of rgrp header in fs blocks */
131 __u32 __pad;
132
133 __be64 ri_data0; /* first data location */
134 __be32 ri_data; /* num of data blocks in rgrp */
135
136 __be32 ri_bitbytes; /* number of bytes in data bitmaps */
137
138 __u8 ri_reserved[64];
139 };
140
141 /*
142 * resource group header structure
143 */
144
145 /* Number of blocks per byte in rgrp */
146 #define GFS2_NBBY 4
147 #define GFS2_BIT_SIZE 2
148 #define GFS2_BIT_MASK 0x00000003
149
150 #define GFS2_BLKST_FREE 0
151 #define GFS2_BLKST_USED 1
152 #define GFS2_BLKST_UNLINKED 2
153 #define GFS2_BLKST_DINODE 3
154
155 #define GFS2_RGF_JOURNAL 0x00000001
156 #define GFS2_RGF_METAONLY 0x00000002
157 #define GFS2_RGF_DATAONLY 0x00000004
158 #define GFS2_RGF_NOALLOC 0x00000008
159
160 struct gfs2_rgrp {
161 struct gfs2_meta_header rg_header;
162
163 __be32 rg_flags;
164 __be32 rg_free;
165 __be32 rg_dinodes;
166 __be32 __pad;
167 __be64 rg_igeneration;
168
169 __u8 rg_reserved[80]; /* Several fields from gfs1 now reserved */
170 };
171
172 /*
173 * quota linked list: user quotas and group quotas form two separate
174 * singly linked lists. ll_next stores uids or gids of next quotas in the
175 * linked list.
176
177 Given the uid/gid, how to calculate the quota file offsets for the corresponding
178 gfs2_quota structures on disk:
179
180 for user quotas, given uid,
181 offset = uid * sizeof(struct gfs2_quota);
182
183 for group quotas, given gid,
184 offset = (gid * sizeof(struct gfs2_quota)) + sizeof(struct gfs2_quota);
185
186
187 uid:0 gid:0 uid:12 gid:12 uid:17 gid:17 uid:5142 gid:5142
188 +-------+-------+ +-------+-------+ +-------+- - - -+ +- - - -+-------+
189 | valid | valid | :: | valid | valid | :: | valid | inval | :: | inval | valid |
190 +-------+-------+ +-------+-------+ +-------+- - - -+ +- - - -+-------+
191 next:12 next:12 next:17 next:5142 next:NULL next:NULL
192 | | | | |<-- user quota list |
193 \______|___________/ \______|___________/ group quota list -->|
194 | | |
195 \__________________/ \_______________________________________/
196
197 */
198
199 /*
200 * quota structure
201 */
202
203 struct gfs2_quota {
204 __be64 qu_limit;
205 __be64 qu_warn;
206 __be64 qu_value;
207 __be32 qu_ll_next; /* location of next quota in list */
208 __u8 qu_reserved[60];
209 };
210
211 /*
212 * dinode structure
213 */
214
215 #define GFS2_MAX_META_HEIGHT 10
216 #define GFS2_DIR_MAX_DEPTH 17
217
218 #define DT2IF(dt) (((dt) << 12) & S_IFMT)
219 #define IF2DT(sif) (((sif) & S_IFMT) >> 12)
220
221 enum {
222 gfs2fl_Jdata = 0,
223 gfs2fl_ExHash = 1,
224 gfs2fl_Unused = 2,
225 gfs2fl_EaIndirect = 3,
226 gfs2fl_Directio = 4,
227 gfs2fl_Immutable = 5,
228 gfs2fl_AppendOnly = 6,
229 gfs2fl_NoAtime = 7,
230 gfs2fl_Sync = 8,
231 gfs2fl_System = 9,
232 gfs2fl_TruncInProg = 29,
233 gfs2fl_InheritDirectio = 30,
234 gfs2fl_InheritJdata = 31,
235 };
236
237 /* Dinode flags */
238 #define GFS2_DIF_JDATA 0x00000001
239 #define GFS2_DIF_EXHASH 0x00000002
240 #define GFS2_DIF_UNUSED 0x00000004 /* only in gfs1 */
241 #define GFS2_DIF_EA_INDIRECT 0x00000008
242 #define GFS2_DIF_DIRECTIO 0x00000010
243 #define GFS2_DIF_IMMUTABLE 0x00000020
244 #define GFS2_DIF_APPENDONLY 0x00000040
245 #define GFS2_DIF_NOATIME 0x00000080
246 #define GFS2_DIF_SYNC 0x00000100
247 #define GFS2_DIF_SYSTEM 0x00000200 /* New in gfs2 */
248 #define GFS2_DIF_TRUNC_IN_PROG 0x20000000 /* New in gfs2 */
249 #define GFS2_DIF_INHERIT_DIRECTIO 0x40000000
250 #define GFS2_DIF_INHERIT_JDATA 0x80000000
251
252 struct gfs2_dinode {
253 struct gfs2_meta_header di_header;
254
255 struct gfs2_inum di_num;
256
257 __be32 di_mode; /* mode of file */
258 __be32 di_uid; /* owner's user id */
259 __be32 di_gid; /* owner's group id */
260 __be32 di_nlink; /* number of links to this file */
261 __be64 di_size; /* number of bytes in file */
262 __be64 di_blocks; /* number of blocks in file */
263 __be64 di_atime; /* time last accessed */
264 __be64 di_mtime; /* time last modified */
265 __be64 di_ctime; /* time last changed */
266 __be32 di_major; /* device major number */
267 __be32 di_minor; /* device minor number */
268
269 /* This section varies from gfs1. Padding added to align with
270 * remainder of dinode
271 */
272 __be64 di_goal_meta; /* rgrp to alloc from next */
273 __be64 di_goal_data; /* data block goal */
274 __be64 di_generation; /* generation number for NFS */
275
276 __be32 di_flags; /* GFS2_DIF_... */
277 __be32 di_payload_format; /* GFS2_FORMAT_... */
278 __u16 __pad1; /* Was ditype in gfs1 */
279 __be16 di_height; /* height of metadata */
280 __u32 __pad2; /* Unused incarnation number from gfs1 */
281
282 /* These only apply to directories */
283 __u16 __pad3; /* Padding */
284 __be16 di_depth; /* Number of bits in the table */
285 __be32 di_entries; /* The number of entries in the directory */
286
287 struct gfs2_inum __pad4; /* Unused even in current gfs1 */
288
289 __be64 di_eattr; /* extended attribute block number */
290 __be32 di_atime_nsec; /* nsec portion of atime */
291 __be32 di_mtime_nsec; /* nsec portion of mtime */
292 __be32 di_ctime_nsec; /* nsec portion of ctime */
293
294 __u8 di_reserved[44];
295 };
296
297 /*
298 * directory structure - many of these per directory file
299 */
300
301 #define GFS2_FNAMESIZE 255
302 #define GFS2_DIRENT_SIZE(name_len) ((sizeof(struct gfs2_dirent) + (name_len) + 7) & ~7)
303
304 struct gfs2_dirent {
305 struct gfs2_inum de_inum;
306 __be32 de_hash;
307 __be16 de_rec_len;
308 __be16 de_name_len;
309 __be16 de_type;
310 __u8 __pad[14];
311 };
312
313 /*
314 * Header of leaf directory nodes
315 */
316
317 struct gfs2_leaf {
318 struct gfs2_meta_header lf_header;
319
320 __be16 lf_depth; /* Depth of leaf */
321 __be16 lf_entries; /* Number of dirents in leaf */
322 __be32 lf_dirent_format; /* Format of the dirents */
323 __be64 lf_next; /* Next leaf, if overflow */
324
325 __u8 lf_reserved[64];
326 };
327
328 /*
329 * Extended attribute header format
330 */
331
332 #define GFS2_EA_MAX_NAME_LEN 255
333 #define GFS2_EA_MAX_DATA_LEN 65536
334
335 #define GFS2_EATYPE_UNUSED 0
336 #define GFS2_EATYPE_USR 1
337 #define GFS2_EATYPE_SYS 2
338 #define GFS2_EATYPE_SECURITY 3
339
340 #define GFS2_EATYPE_LAST 3
341 #define GFS2_EATYPE_VALID(x) ((x) <= GFS2_EATYPE_LAST)
342
343 #define GFS2_EAFLAG_LAST 0x01 /* last ea in block */
344
345 struct gfs2_ea_header {
346 __be32 ea_rec_len;
347 __be32 ea_data_len;
348 __u8 ea_name_len; /* no NULL pointer after the string */
349 __u8 ea_type; /* GFS2_EATYPE_... */
350 __u8 ea_flags; /* GFS2_EAFLAG_... */
351 __u8 ea_num_ptrs;
352 __u32 __pad;
353 };
354
355 /*
356 * Log header structure
357 */
358
359 #define GFS2_LOG_HEAD_UNMOUNT 0x00000001 /* log is clean */
360
361 struct gfs2_log_header {
362 struct gfs2_meta_header lh_header;
363
364 __be64 lh_sequence; /* Sequence number of this transaction */
365 __be32 lh_flags; /* GFS2_LOG_HEAD_... */
366 __be32 lh_tail; /* Block number of log tail */
367 __be32 lh_blkno;
368 __be32 lh_hash;
369 };
370
371 /*
372 * Log type descriptor
373 */
374
375 #define GFS2_LOG_DESC_METADATA 300
376 /* ld_data1 is the number of metadata blocks in the descriptor.
377 ld_data2 is unused. */
378
379 #define GFS2_LOG_DESC_REVOKE 301
380 /* ld_data1 is the number of revoke blocks in the descriptor.
381 ld_data2 is unused. */
382
383 #define GFS2_LOG_DESC_JDATA 302
384 /* ld_data1 is the number of data blocks in the descriptor.
385 ld_data2 is unused. */
386
387 struct gfs2_log_descriptor {
388 struct gfs2_meta_header ld_header;
389
390 __be32 ld_type; /* GFS2_LOG_DESC_... */
391 __be32 ld_length; /* Number of buffers in this chunk */
392 __be32 ld_data1; /* descriptor-specific field */
393 __be32 ld_data2; /* descriptor-specific field */
394
395 __u8 ld_reserved[32];
396 };
397
398 /*
399 * Inum Range
400 * Describe a range of formal inode numbers allocated to
401 * one machine to assign to inodes.
402 */
403
404 #define GFS2_INUM_QUANTUM 1048576
405
406 struct gfs2_inum_range {
407 __be64 ir_start;
408 __be64 ir_length;
409 };
410
411 /*
412 * Statfs change
413 * Describes an change to the pool of free and allocated
414 * blocks.
415 */
416
417 struct gfs2_statfs_change {
418 __be64 sc_total;
419 __be64 sc_free;
420 __be64 sc_dinodes;
421 };
422
423 /*
424 * Quota change
425 * Describes an allocation change for a particular
426 * user or group.
427 */
428
429 #define GFS2_QCF_USER 0x00000001
430
431 struct gfs2_quota_change {
432 __be64 qc_change;
433 __be32 qc_flags; /* GFS2_QCF_... */
434 __be32 qc_id;
435 };
436
437 struct gfs2_quota_lvb {
438 __be32 qb_magic;
439 __u32 __pad;
440 __be64 qb_limit; /* Hard limit of # blocks to alloc */
441 __be64 qb_warn; /* Warn user when alloc is above this # */
442 __be64 qb_value; /* Current # blocks allocated */
443 };
444
445 #endif /* __GFS2_ONDISK_DOT_H__ */
446
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