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diff --git a/include/linux/gfs2_ondisk.h b/include/linux/gfs2_ondisk.h
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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#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
52struct gfs2_inum {
53 __be64 no_formal_ino;
54 __be64 no_addr;
55};
56
57static inline int gfs2_inum_equal(const struct gfs2_inum *ino1,
58 const struct gfs2_inum *ino2)
59{
60 return ino1->no_formal_ino == ino2->no_formal_ino &&
61 ino1->no_addr == ino2->no_addr;
62}
63
64/*
65 * Generic metadata head structure
66 * Every inplace buffer logged in the journal must start with this.
67 */
68
69#define GFS2_METATYPE_NONE 0
70#define GFS2_METATYPE_SB 1
71#define GFS2_METATYPE_RG 2
72#define GFS2_METATYPE_RB 3
73#define GFS2_METATYPE_DI 4
74#define GFS2_METATYPE_IN 5
75#define GFS2_METATYPE_LF 6
76#define GFS2_METATYPE_JD 7
77#define GFS2_METATYPE_LH 8
78#define GFS2_METATYPE_LD 9
79#define GFS2_METATYPE_LB 12
80#define GFS2_METATYPE_EA 10
81#define GFS2_METATYPE_ED 11
82#define GFS2_METATYPE_QC 14
83
84struct gfs2_meta_header {
85 __be32 mh_magic;
86 __be32 mh_type;
87 __be64 __pad0; /* Was generation number in gfs1 */
88 __be32 mh_format;
89 __be32 __pad1; /* Was incarnation number in gfs1 */
90};
91
92/*
93 * super-block structure
94 *
95 * It's probably good if SIZEOF_SB <= GFS2_BASIC_BLOCK (512 bytes)
96 *
97 * Order is important, need to be able to read old superblocks to do on-disk
98 * version upgrades.
99 */
100
101/* Address of superblock in GFS2 basic blocks */
102#define GFS2_SB_ADDR 128
103
104/* The lock number for the superblock (must be zero) */
105#define GFS2_SB_LOCK 0
106
107/* Requirement: GFS2_LOCKNAME_LEN % 8 == 0
108 Includes: the fencing zero at the end */
109#define GFS2_LOCKNAME_LEN 64
110
111struct gfs2_sb {
112 struct gfs2_meta_header sb_header;
113
114 __be32 sb_fs_format;
115 __be32 sb_multihost_format;
116 __u32 __pad0; /* Was superblock flags in gfs1 */
117
118 __be32 sb_bsize;
119 __be32 sb_bsize_shift;
120 __u32 __pad1; /* Was journal segment size in gfs1 */
121
122 struct gfs2_inum sb_master_dir; /* Was jindex dinode in gfs1 */
123 struct gfs2_inum __pad2; /* Was rindex dinode in gfs1 */
124 struct gfs2_inum sb_root_dir;
125
126 char sb_lockproto[GFS2_LOCKNAME_LEN];
127 char sb_locktable[GFS2_LOCKNAME_LEN];
128 /* In gfs1, quota and license dinodes followed */
129};
130
131/*
132 * resource index structure
133 */
134
135struct gfs2_rindex {
136 __be64 ri_addr; /* grp block disk address */
137 __be32 ri_length; /* length of rgrp header in fs blocks */
138 __u32 __pad;
139
140 __be64 ri_data0; /* first data location */
141 __be32 ri_data; /* num of data blocks in rgrp */
142
143 __be32 ri_bitbytes; /* number of bytes in data bitmaps */
144
145 __u8 ri_reserved[64];
146};
147
148/*
149 * resource group header structure
150 */
151
152/* Number of blocks per byte in rgrp */
153#define GFS2_NBBY 4
154#define GFS2_BIT_SIZE 2
155#define GFS2_BIT_MASK 0x00000003
156
157#define GFS2_BLKST_FREE 0
158#define GFS2_BLKST_USED 1
159#define GFS2_BLKST_UNLINKED 2
160#define GFS2_BLKST_DINODE 3
161
162#define GFS2_RGF_JOURNAL 0x00000001
163#define GFS2_RGF_METAONLY 0x00000002
164#define GFS2_RGF_DATAONLY 0x00000004
165#define GFS2_RGF_NOALLOC 0x00000008
166
167struct gfs2_rgrp {
168 struct gfs2_meta_header rg_header;
169
170 __be32 rg_flags;
171 __be32 rg_free;
172 __be32 rg_dinodes;
173 __be32 __pad;
174 __be64 rg_igeneration;
175
176 __u8 rg_reserved[80]; /* Several fields from gfs1 now reserved */
177};
178
179/*
180 * quota structure
181 */
182
183struct gfs2_quota {
184 __be64 qu_limit;
185 __be64 qu_warn;
186 __be64 qu_value;
187 __u8 qu_reserved[64];
188};
189
190/*
191 * dinode structure
192 */
193
194#define GFS2_MAX_META_HEIGHT 10
195#define GFS2_DIR_MAX_DEPTH 17
196
197#define DT2IF(dt) (((dt) << 12) & S_IFMT)
198#define IF2DT(sif) (((sif) & S_IFMT) >> 12)
199
200enum {
201 gfs2fl_Jdata = 0,
202 gfs2fl_ExHash = 1,
203 gfs2fl_Unused = 2,
204 gfs2fl_EaIndirect = 3,
205 gfs2fl_Directio = 4,
206 gfs2fl_Immutable = 5,
207 gfs2fl_AppendOnly = 6,
208 gfs2fl_NoAtime = 7,
209 gfs2fl_Sync = 8,
210 gfs2fl_System = 9,
211 gfs2fl_TruncInProg = 29,
212 gfs2fl_InheritDirectio = 30,
213 gfs2fl_InheritJdata = 31,
214};
215
216/* Dinode flags */
217#define GFS2_DIF_JDATA 0x00000001
218#define GFS2_DIF_EXHASH 0x00000002
219#define GFS2_DIF_UNUSED 0x00000004 /* only in gfs1 */
220#define GFS2_DIF_EA_INDIRECT 0x00000008
221#define GFS2_DIF_DIRECTIO 0x00000010
222#define GFS2_DIF_IMMUTABLE 0x00000020
223#define GFS2_DIF_APPENDONLY 0x00000040
224#define GFS2_DIF_NOATIME 0x00000080
225#define GFS2_DIF_SYNC 0x00000100
226#define GFS2_DIF_SYSTEM 0x00000200 /* New in gfs2 */
227#define GFS2_DIF_TRUNC_IN_PROG 0x20000000 /* New in gfs2 */
228#define GFS2_DIF_INHERIT_DIRECTIO 0x40000000
229#define GFS2_DIF_INHERIT_JDATA 0x80000000
230
231struct gfs2_dinode {
232 struct gfs2_meta_header di_header;
233
234 struct gfs2_inum di_num;
235
236 __be32 di_mode; /* mode of file */
237 __be32 di_uid; /* owner's user id */
238 __be32 di_gid; /* owner's group id */
239 __be32 di_nlink; /* number of links to this file */
240 __be64 di_size; /* number of bytes in file */
241 __be64 di_blocks; /* number of blocks in file */
242 __be64 di_atime; /* time last accessed */
243 __be64 di_mtime; /* time last modified */
244 __be64 di_ctime; /* time last changed */
245 __be32 di_major; /* device major number */
246 __be32 di_minor; /* device minor number */
247
248 /* This section varies from gfs1. Padding added to align with
249 * remainder of dinode
250 */
251 __be64 di_goal_meta; /* rgrp to alloc from next */
252 __be64 di_goal_data; /* data block goal */
253 __be64 di_generation; /* generation number for NFS */
254
255 __be32 di_flags; /* GFS2_DIF_... */
256 __be32 di_payload_format; /* GFS2_FORMAT_... */
257 __u16 __pad1; /* Was ditype in gfs1 */
258 __be16 di_height; /* height of metadata */
259 __u32 __pad2; /* Unused incarnation number from gfs1 */
260
261 /* These only apply to directories */
262 __u16 __pad3; /* Padding */
263 __be16 di_depth; /* Number of bits in the table */
264 __be32 di_entries; /* The number of entries in the directory */
265
266 struct gfs2_inum __pad4; /* Unused even in current gfs1 */
267
268 __be64 di_eattr; /* extended attribute block number */
269
270 __u8 di_reserved[56];
271};
272
273/*
274 * directory structure - many of these per directory file
275 */
276
277#define GFS2_FNAMESIZE 255
278#define GFS2_DIRENT_SIZE(name_len) ((sizeof(struct gfs2_dirent) + (name_len) + 7) & ~7)
279
280struct gfs2_dirent {
281 struct gfs2_inum de_inum;
282 __be32 de_hash;
283 __be16 de_rec_len;
284 __be16 de_name_len;
285 __be16 de_type;
286 __u8 __pad[14];
287};
288
289/*
290 * Header of leaf directory nodes
291 */
292
293struct gfs2_leaf {
294 struct gfs2_meta_header lf_header;
295
296 __be16 lf_depth; /* Depth of leaf */
297 __be16 lf_entries; /* Number of dirents in leaf */
298 __be32 lf_dirent_format; /* Format of the dirents */
299 __be64 lf_next; /* Next leaf, if overflow */
300
301 __u8 lf_reserved[64];
302};
303
304/*
305 * Extended attribute header format
306 */
307
308#define GFS2_EA_MAX_NAME_LEN 255
309#define GFS2_EA_MAX_DATA_LEN 65536
310
311#define GFS2_EATYPE_UNUSED 0
312#define GFS2_EATYPE_USR 1
313#define GFS2_EATYPE_SYS 2
314#define GFS2_EATYPE_SECURITY 3
315
316#define GFS2_EATYPE_LAST 3
317#define GFS2_EATYPE_VALID(x) ((x) <= GFS2_EATYPE_LAST)
318
319#define GFS2_EAFLAG_LAST 0x01 /* last ea in block */
320
321struct gfs2_ea_header {
322 __be32 ea_rec_len;
323 __be32 ea_data_len;
324 __u8 ea_name_len; /* no NULL pointer after the string */
325 __u8 ea_type; /* GFS2_EATYPE_... */
326 __u8 ea_flags; /* GFS2_EAFLAG_... */
327 __u8 ea_num_ptrs;
328 __u32 __pad;
329};
330
331/*
332 * Log header structure
333 */
334
335#define GFS2_LOG_HEAD_UNMOUNT 0x00000001 /* log is clean */
336
337struct gfs2_log_header {
338 struct gfs2_meta_header lh_header;
339
340 __be64 lh_sequence; /* Sequence number of this transaction */
341 __be32 lh_flags; /* GFS2_LOG_HEAD_... */
342 __be32 lh_tail; /* Block number of log tail */
343 __be32 lh_blkno;
344 __be32 lh_hash;
345};
346
347/*
348 * Log type descriptor
349 */
350
351#define GFS2_LOG_DESC_METADATA 300
352/* ld_data1 is the number of metadata blocks in the descriptor.
353 ld_data2 is unused. */
354
355#define GFS2_LOG_DESC_REVOKE 301
356/* ld_data1 is the number of revoke blocks in the descriptor.
357 ld_data2 is unused. */
358
359#define GFS2_LOG_DESC_JDATA 302
360/* ld_data1 is the number of data blocks in the descriptor.
361 ld_data2 is unused. */
362
363struct gfs2_log_descriptor {
364 struct gfs2_meta_header ld_header;
365
366 __be32 ld_type; /* GFS2_LOG_DESC_... */
367 __be32 ld_length; /* Number of buffers in this chunk */
368 __be32 ld_data1; /* descriptor-specific field */
369 __be32 ld_data2; /* descriptor-specific field */
370
371 __u8 ld_reserved[32];
372};
373
374/*
375 * Inum Range
376 * Describe a range of formal inode numbers allocated to
377 * one machine to assign to inodes.
378 */
379
380#define GFS2_INUM_QUANTUM 1048576
381
382struct gfs2_inum_range {
383 __be64 ir_start;
384 __be64 ir_length;
385};
386
387/*
388 * Statfs change
389 * Describes an change to the pool of free and allocated
390 * blocks.
391 */
392
393struct gfs2_statfs_change {
394 __be64 sc_total;
395 __be64 sc_free;
396 __be64 sc_dinodes;
397};
398
399/*
400 * Quota change
401 * Describes an allocation change for a particular
402 * user or group.
403 */
404
405#define GFS2_QCF_USER 0x00000001
406
407struct gfs2_quota_change {
408 __be64 qc_change;
409 __be32 qc_flags; /* GFS2_QCF_... */
410 __be32 qc_id;
411};
412
413#ifdef __KERNEL__
414/* Translation functions */
415
416extern void gfs2_inum_in(struct gfs2_inum *no, const void *buf);
417extern void gfs2_inum_out(const struct gfs2_inum *no, void *buf);
418extern void gfs2_sb_in(struct gfs2_sb *sb, const void *buf);
419extern void gfs2_rindex_in(struct gfs2_rindex *ri, const void *buf);
420extern void gfs2_rindex_out(const struct gfs2_rindex *ri, void *buf);
421extern void gfs2_rgrp_in(struct gfs2_rgrp *rg, const void *buf);
422extern void gfs2_rgrp_out(const struct gfs2_rgrp *rg, void *buf);
423extern void gfs2_quota_in(struct gfs2_quota *qu, const void *buf);
424extern void gfs2_quota_out(const struct gfs2_quota *qu, void *buf);
425extern void gfs2_dinode_in(struct gfs2_dinode *di, const void *buf);
426extern void gfs2_dinode_out(const struct gfs2_dinode *di, void *buf);
427extern void gfs2_ea_header_in(struct gfs2_ea_header *ea, const void *buf);
428extern void gfs2_ea_header_out(const struct gfs2_ea_header *ea, void *buf);
429extern void gfs2_log_header_in(struct gfs2_log_header *lh, const void *buf);
430extern void gfs2_inum_range_in(struct gfs2_inum_range *ir, const void *buf);
431extern void gfs2_inum_range_out(const struct gfs2_inum_range *ir, void *buf);
432extern void gfs2_statfs_change_in(struct gfs2_statfs_change *sc, const void *buf);
433extern void gfs2_statfs_change_out(const struct gfs2_statfs_change *sc, void *buf);
434extern void gfs2_quota_change_in(struct gfs2_quota_change *qc, const void *buf);
435
436/* Printing functions */
437
438extern void gfs2_rindex_print(const struct gfs2_rindex *ri);
439extern void gfs2_dinode_print(const struct gfs2_dinode *di);
440
441#endif /* __KERNEL__ */
442
443#endif /* __GFS2_ONDISK_DOT_H__ */