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 __be32 __pad1; /* Was incarnation number in gfs1 */
85 };
86
87 /*
88 * super-block structure
89 *
90 * It's probably good if SIZEOF_SB <= GFS2_BASIC_BLOCK (512 bytes)
91 *
92 * Order is important, need to be able to read old superblocks to do on-disk
93 * version upgrades.
94 */
95
96 /* Address of superblock in GFS2 basic blocks */
97 #define GFS2_SB_ADDR 128
98
99 /* The lock number for the superblock (must be zero) */
100 #define GFS2_SB_LOCK 0
101
102 /* Requirement: GFS2_LOCKNAME_LEN % 8 == 0
103 Includes: the fencing zero at the end */
104 #define GFS2_LOCKNAME_LEN 64
105
106 struct gfs2_sb {
107 struct gfs2_meta_header sb_header;
108
109 __be32 sb_fs_format;
110 __be32 sb_multihost_format;
111 __u32 __pad0; /* Was superblock flags in gfs1 */
112
113 __be32 sb_bsize;
114 __be32 sb_bsize_shift;
115 __u32 __pad1; /* Was journal segment size in gfs1 */
116
117 struct gfs2_inum sb_master_dir; /* Was jindex dinode in gfs1 */
118 struct gfs2_inum __pad2; /* Was rindex dinode in gfs1 */
119 struct gfs2_inum sb_root_dir;
120
121 char sb_lockproto[GFS2_LOCKNAME_LEN];
122 char sb_locktable[GFS2_LOCKNAME_LEN];
123
124 struct gfs2_inum __pad3; /* Was quota inode in gfs1 */
125 struct gfs2_inum __pad4; /* Was licence inode in gfs1 */
126 #define GFS2_HAS_UUID 1
127 __u8 sb_uuid[16]; /* The UUID, maybe 0 for backwards compat */
128 };
129
130 /*
131 * resource index structure
132 */
133
134 struct gfs2_rindex {
135 __be64 ri_addr; /* grp block disk address */
136 __be32 ri_length; /* length of rgrp header in fs blocks */
137 __u32 __pad;
138
139 __be64 ri_data0; /* first data location */
140 __be32 ri_data; /* num of data blocks in rgrp */
141
142 __be32 ri_bitbytes; /* number of bytes in data bitmaps */
143
144 __u8 ri_reserved[64];
145 };
146
147 /*
148 * resource group header structure
149 */
150
151 /* Number of blocks per byte in rgrp */
152 #define GFS2_NBBY 4
153 #define GFS2_BIT_SIZE 2
154 #define GFS2_BIT_MASK 0x00000003
155
156 #define GFS2_BLKST_FREE 0
157 #define GFS2_BLKST_USED 1
158 #define GFS2_BLKST_UNLINKED 2
159 #define GFS2_BLKST_DINODE 3
160
161 #define GFS2_RGF_JOURNAL 0x00000001
162 #define GFS2_RGF_METAONLY 0x00000002
163 #define GFS2_RGF_DATAONLY 0x00000004
164 #define GFS2_RGF_NOALLOC 0x00000008
165
166 struct gfs2_rgrp {
167 struct gfs2_meta_header rg_header;
168
169 __be32 rg_flags;
170 __be32 rg_free;
171 __be32 rg_dinodes;
172 __be32 __pad;
173 __be64 rg_igeneration;
174
175 __u8 rg_reserved[80]; /* Several fields from gfs1 now reserved */
176 };
177
178 /*
179 * quota linked list: user quotas and group quotas form two separate
180 * singly linked lists. ll_next stores uids or gids of next quotas in the
181 * linked list.
182
183 Given the uid/gid, how to calculate the quota file offsets for the corresponding
184 gfs2_quota structures on disk:
185
186 for user quotas, given uid,
187 offset = uid * sizeof(struct gfs2_quota);
188
189 for group quotas, given gid,
190 offset = (gid * sizeof(struct gfs2_quota)) + sizeof(struct gfs2_quota);
191
192
193 uid:0 gid:0 uid:12 gid:12 uid:17 gid:17 uid:5142 gid:5142
194 +-------+-------+ +-------+-------+ +-------+- - - -+ +- - - -+-------+
195 | valid | valid | :: | valid | valid | :: | valid | inval | :: | inval | valid |
196 +-------+-------+ +-------+-------+ +-------+- - - -+ +- - - -+-------+
197 next:12 next:12 next:17 next:5142 next:NULL next:NULL
198 | | | | |<-- user quota list |
199 \______|___________/ \______|___________/ group quota list -->|
200 | | |
201 \__________________/ \_______________________________________/
202
203 */
204
205 /*
206 * quota structure
207 */
208
209 struct gfs2_quota {
210 __be64 qu_limit;
211 __be64 qu_warn;
212 __be64 qu_value;
213 __be32 qu_ll_next; /* location of next quota in list */
214 __u8 qu_reserved[60];
215 };
216
217 /*
218 * dinode structure
219 */
220
221 #define GFS2_MAX_META_HEIGHT 10
222 #define GFS2_DIR_MAX_DEPTH 17
223
224 #define DT2IF(dt) (((dt) << 12) & S_IFMT)
225 #define IF2DT(sif) (((sif) & S_IFMT) >> 12)
226
227 enum {
228 gfs2fl_Jdata = 0,
229 gfs2fl_ExHash = 1,
230 gfs2fl_Unused = 2,
231 gfs2fl_EaIndirect = 3,
232 gfs2fl_Directio = 4,
233 gfs2fl_Immutable = 5,
234 gfs2fl_AppendOnly = 6,
235 gfs2fl_NoAtime = 7,
236 gfs2fl_Sync = 8,
237 gfs2fl_System = 9,
238 gfs2fl_TruncInProg = 29,
239 gfs2fl_InheritDirectio = 30,
240 gfs2fl_InheritJdata = 31,
241 };
242
243 /* Dinode flags */
244 #define GFS2_DIF_JDATA 0x00000001
245 #define GFS2_DIF_EXHASH 0x00000002
246 #define GFS2_DIF_UNUSED 0x00000004 /* only in gfs1 */
247 #define GFS2_DIF_EA_INDIRECT 0x00000008
248 #define GFS2_DIF_DIRECTIO 0x00000010
249 #define GFS2_DIF_IMMUTABLE 0x00000020
250 #define GFS2_DIF_APPENDONLY 0x00000040
251 #define GFS2_DIF_NOATIME 0x00000080
252 #define GFS2_DIF_SYNC 0x00000100
253 #define GFS2_DIF_SYSTEM 0x00000200 /* New in gfs2 */
254 #define GFS2_DIF_TRUNC_IN_PROG 0x20000000 /* New in gfs2 */
255 #define GFS2_DIF_INHERIT_DIRECTIO 0x40000000
256 #define GFS2_DIF_INHERIT_JDATA 0x80000000
257
258 struct gfs2_dinode {
259 struct gfs2_meta_header di_header;
260
261 struct gfs2_inum di_num;
262
263 __be32 di_mode; /* mode of file */
264 __be32 di_uid; /* owner's user id */
265 __be32 di_gid; /* owner's group id */
266 __be32 di_nlink; /* number of links to this file */
267 __be64 di_size; /* number of bytes in file */
268 __be64 di_blocks; /* number of blocks in file */
269 __be64 di_atime; /* time last accessed */
270 __be64 di_mtime; /* time last modified */
271 __be64 di_ctime; /* time last changed */
272 __be32 di_major; /* device major number */
273 __be32 di_minor; /* device minor number */
274
275 /* This section varies from gfs1. Padding added to align with
276 * remainder of dinode
277 */
278 __be64 di_goal_meta; /* rgrp to alloc from next */
279 __be64 di_goal_data; /* data block goal */
280 __be64 di_generation; /* generation number for NFS */
281
282 __be32 di_flags; /* GFS2_DIF_... */
283 __be32 di_payload_format; /* GFS2_FORMAT_... */
284 __u16 __pad1; /* Was ditype in gfs1 */
285 __be16 di_height; /* height of metadata */
286 __u32 __pad2; /* Unused incarnation number from gfs1 */
287
288 /* These only apply to directories */
289 __u16 __pad3; /* Padding */
290 __be16 di_depth; /* Number of bits in the table */
291 __be32 di_entries; /* The number of entries in the directory */
292
293 struct gfs2_inum __pad4; /* Unused even in current gfs1 */
294
295 __be64 di_eattr; /* extended attribute block number */
296 __be32 di_atime_nsec; /* nsec portion of atime */
297 __be32 di_mtime_nsec; /* nsec portion of mtime */
298 __be32 di_ctime_nsec; /* nsec portion of ctime */
299
300 __u8 di_reserved[44];
301 };
302
303 /*
304 * directory structure - many of these per directory file
305 */
306
307 #define GFS2_FNAMESIZE 255
308 #define GFS2_DIRENT_SIZE(name_len) ((sizeof(struct gfs2_dirent) + (name_len) + 7) & ~7)
309
310 struct gfs2_dirent {
311 struct gfs2_inum de_inum;
312 __be32 de_hash;
313 __be16 de_rec_len;
314 __be16 de_name_len;
315 __be16 de_type;
316 __u8 __pad[14];
317 };
318
319 /*
320 * Header of leaf directory nodes
321 */
322
323 struct gfs2_leaf {
324 struct gfs2_meta_header lf_header;
325
326 __be16 lf_depth; /* Depth of leaf */
327 __be16 lf_entries; /* Number of dirents in leaf */
328 __be32 lf_dirent_format; /* Format of the dirents */
329 __be64 lf_next; /* Next leaf, if overflow */
330
331 __u8 lf_reserved[64];
332 };
333
334 /*
335 * Extended attribute header format
336 */
337
338 #define GFS2_EA_MAX_NAME_LEN 255
339 #define GFS2_EA_MAX_DATA_LEN 65536
340
341 #define GFS2_EATYPE_UNUSED 0
342 #define GFS2_EATYPE_USR 1
343 #define GFS2_EATYPE_SYS 2
344 #define GFS2_EATYPE_SECURITY 3
345
346 #define GFS2_EATYPE_LAST 3
347 #define GFS2_EATYPE_VALID(x) ((x) <= GFS2_EATYPE_LAST)
348
349 #define GFS2_EAFLAG_LAST 0x01 /* last ea in block */
350
351 struct gfs2_ea_header {
352 __be32 ea_rec_len;
353 __be32 ea_data_len;
354 __u8 ea_name_len; /* no NULL pointer after the string */
355 __u8 ea_type; /* GFS2_EATYPE_... */
356 __u8 ea_flags; /* GFS2_EAFLAG_... */
357 __u8 ea_num_ptrs;
358 __u32 __pad;
359 };
360
361 /*
362 * Log header structure
363 */
364
365 #define GFS2_LOG_HEAD_UNMOUNT 0x00000001 /* log is clean */
366
367 struct gfs2_log_header {
368 struct gfs2_meta_header lh_header;
369
370 __be64 lh_sequence; /* Sequence number of this transaction */
371 __be32 lh_flags; /* GFS2_LOG_HEAD_... */
372 __be32 lh_tail; /* Block number of log tail */
373 __be32 lh_blkno;
374 __be32 lh_hash;
375 };
376
377 /*
378 * Log type descriptor
379 */
380
381 #define GFS2_LOG_DESC_METADATA 300
382 /* ld_data1 is the number of metadata blocks in the descriptor.
383 ld_data2 is unused. */
384
385 #define GFS2_LOG_DESC_REVOKE 301
386 /* ld_data1 is the number of revoke blocks in the descriptor.
387 ld_data2 is unused. */
388
389 #define GFS2_LOG_DESC_JDATA 302
390 /* ld_data1 is the number of data blocks in the descriptor.
391 ld_data2 is unused. */
392
393 struct gfs2_log_descriptor {
394 struct gfs2_meta_header ld_header;
395
396 __be32 ld_type; /* GFS2_LOG_DESC_... */
397 __be32 ld_length; /* Number of buffers in this chunk */
398 __be32 ld_data1; /* descriptor-specific field */
399 __be32 ld_data2; /* descriptor-specific field */
400
401 __u8 ld_reserved[32];
402 };
403
404 /*
405 * Inum Range
406 * Describe a range of formal inode numbers allocated to
407 * one machine to assign to inodes.
408 */
409
410 #define GFS2_INUM_QUANTUM 1048576
411
412 struct gfs2_inum_range {
413 __be64 ir_start;
414 __be64 ir_length;
415 };
416
417 /*
418 * Statfs change
419 * Describes an change to the pool of free and allocated
420 * blocks.
421 */
422
423 struct gfs2_statfs_change {
424 __be64 sc_total;
425 __be64 sc_free;
426 __be64 sc_dinodes;
427 };
428
429 /*
430 * Quota change
431 * Describes an allocation change for a particular
432 * user or group.
433 */
434
435 #define GFS2_QCF_USER 0x00000001
436
437 struct gfs2_quota_change {
438 __be64 qc_change;
439 __be32 qc_flags; /* GFS2_QCF_... */
440 __be32 qc_id;
441 };
442
443 struct gfs2_quota_lvb {
444 __be32 qb_magic;
445 __u32 __pad;
446 __be64 qb_limit; /* Hard limit of # blocks to alloc */
447 __be64 qb_warn; /* Warn user when alloc is above this # */
448 __be64 qb_value; /* Current # blocks allocated */
449 };
450
451 #endif /* __GFS2_ONDISK_DOT_H__ */
452
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