2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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.
10 #ifndef __GFS2_ONDISK_DOT_H__
11 #define __GFS2_ONDISK_DOT_H__
13 #define GFS2_MAGIC 0x01161970
14 #define GFS2_BASIC_BLOCK 512
15 #define GFS2_BASIC_BLOCK_SHIFT 9
17 /* Lock numbers of the LM_TYPE_NONDISK type */
19 #define GFS2_MOUNT_LOCK 0
20 #define GFS2_LIVE_LOCK 1
21 #define GFS2_TRANS_LOCK 2
22 #define GFS2_RENAME_LOCK 3
24 /* Format numbers for various metadata types */
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
49 * An on-disk inode number
58 * Generic metadata head structure
59 * Every inplace buffer logged in the journal must start with this.
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
77 struct gfs2_meta_header {
80 __be64 __pad0; /* Was generation number in gfs1 */
82 __be32 __pad1; /* Was incarnation number in gfs1 */
86 * super-block structure
88 * It's probably good if SIZEOF_SB <= GFS2_BASIC_BLOCK (512 bytes)
90 * Order is important, need to be able to read old superblocks to do on-disk
94 /* Address of superblock in GFS2 basic blocks */
95 #define GFS2_SB_ADDR 128
97 /* The lock number for the superblock (must be zero) */
98 #define GFS2_SB_LOCK 0
100 /* Requirement: GFS2_LOCKNAME_LEN % 8 == 0
101 Includes: the fencing zero at the end */
102 #define GFS2_LOCKNAME_LEN 64
105 struct gfs2_meta_header sb_header;
108 __be32 sb_multihost_format;
109 __u32 __pad0; /* Was superblock flags in gfs1 */
112 __be32 sb_bsize_shift;
113 __u32 __pad1; /* Was journal segment size in gfs1 */
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;
119 char sb_lockproto[GFS2_LOCKNAME_LEN];
120 char sb_locktable[GFS2_LOCKNAME_LEN];
122 struct gfs2_inum __pad3; /* Was quota inode in gfs1 */
123 struct gfs2_inum __pad4; /* Was licence inode in gfs1 */
124 #define GFS2_HAS_UUID 1
125 __u8 sb_uuid[16]; /* The UUID, maybe 0 for backwards compat */
129 * resource index structure
133 __be64 ri_addr; /* grp block disk address */
134 __be32 ri_length; /* length of rgrp header in fs blocks */
137 __be64 ri_data0; /* first data location */
138 __be32 ri_data; /* num of data blocks in rgrp */
140 __be32 ri_bitbytes; /* number of bytes in data bitmaps */
142 __u8 ri_reserved[64];
146 * resource group header structure
149 /* Number of blocks per byte in rgrp */
151 #define GFS2_BIT_SIZE 2
152 #define GFS2_BIT_MASK 0x00000003
154 #define GFS2_BLKST_FREE 0
155 #define GFS2_BLKST_USED 1
156 #define GFS2_BLKST_UNLINKED 2
157 #define GFS2_BLKST_DINODE 3
159 #define GFS2_RGF_JOURNAL 0x00000001
160 #define GFS2_RGF_METAONLY 0x00000002
161 #define GFS2_RGF_DATAONLY 0x00000004
162 #define GFS2_RGF_NOALLOC 0x00000008
165 struct gfs2_meta_header rg_header;
171 __be64 rg_igeneration;
173 __u8 rg_reserved[80]; /* Several fields from gfs1 now reserved */
177 * quota linked list: user quotas and group quotas form two separate
178 * singly linked lists. ll_next stores uids or gids of next quotas in the
181 Given the uid/gid, how to calculate the quota file offsets for the corresponding
182 gfs2_quota structures on disk:
184 for user quotas, given uid,
185 offset = uid * sizeof(struct gfs2_quota);
187 for group quotas, given gid,
188 offset = (gid * sizeof(struct gfs2_quota)) + sizeof(struct gfs2_quota);
191 uid:0 gid:0 uid:12 gid:12 uid:17 gid:17 uid:5142 gid:5142
192 +-------+-------+ +-------+-------+ +-------+- - - -+ +- - - -+-------+
193 | valid | valid | :: | valid | valid | :: | valid | inval | :: | inval | valid |
194 +-------+-------+ +-------+-------+ +-------+- - - -+ +- - - -+-------+
195 next:12 next:12 next:17 next:5142 next:NULL next:NULL
196 | | | | |<-- user quota list |
197 \______|___________/ \______|___________/ group quota list -->|
199 \__________________/ \_______________________________________/
211 __be32 qu_ll_next; /* location of next quota in list */
212 __u8 qu_reserved[60];
219 #define GFS2_MAX_META_HEIGHT 10
220 #define GFS2_DIR_MAX_DEPTH 17
222 #define DT2IF(dt) (((dt) << 12) & S_IFMT)
223 #define IF2DT(sif) (((sif) & S_IFMT) >> 12)
229 gfs2fl_EaIndirect = 3,
231 gfs2fl_Immutable = 5,
232 gfs2fl_AppendOnly = 6,
236 gfs2fl_TruncInProg = 29,
237 gfs2fl_InheritDirectio = 30,
238 gfs2fl_InheritJdata = 31,
242 #define GFS2_DIF_JDATA 0x00000001
243 #define GFS2_DIF_EXHASH 0x00000002
244 #define GFS2_DIF_UNUSED 0x00000004 /* only in gfs1 */
245 #define GFS2_DIF_EA_INDIRECT 0x00000008
246 #define GFS2_DIF_DIRECTIO 0x00000010
247 #define GFS2_DIF_IMMUTABLE 0x00000020
248 #define GFS2_DIF_APPENDONLY 0x00000040
249 #define GFS2_DIF_NOATIME 0x00000080
250 #define GFS2_DIF_SYNC 0x00000100
251 #define GFS2_DIF_SYSTEM 0x00000200 /* New in gfs2 */
252 #define GFS2_DIF_TRUNC_IN_PROG 0x20000000 /* New in gfs2 */
253 #define GFS2_DIF_INHERIT_DIRECTIO 0x40000000
254 #define GFS2_DIF_INHERIT_JDATA 0x80000000
257 struct gfs2_meta_header di_header;
259 struct gfs2_inum di_num;
261 __be32 di_mode; /* mode of file */
262 __be32 di_uid; /* owner's user id */
263 __be32 di_gid; /* owner's group id */
264 __be32 di_nlink; /* number of links to this file */
265 __be64 di_size; /* number of bytes in file */
266 __be64 di_blocks; /* number of blocks in file */
267 __be64 di_atime; /* time last accessed */
268 __be64 di_mtime; /* time last modified */
269 __be64 di_ctime; /* time last changed */
270 __be32 di_major; /* device major number */
271 __be32 di_minor; /* device minor number */
273 /* This section varies from gfs1. Padding added to align with
274 * remainder of dinode
276 __be64 di_goal_meta; /* rgrp to alloc from next */
277 __be64 di_goal_data; /* data block goal */
278 __be64 di_generation; /* generation number for NFS */
280 __be32 di_flags; /* GFS2_DIF_... */
281 __be32 di_payload_format; /* GFS2_FORMAT_... */
282 __u16 __pad1; /* Was ditype in gfs1 */
283 __be16 di_height; /* height of metadata */
284 __u32 __pad2; /* Unused incarnation number from gfs1 */
286 /* These only apply to directories */
287 __u16 __pad3; /* Padding */
288 __be16 di_depth; /* Number of bits in the table */
289 __be32 di_entries; /* The number of entries in the directory */
291 struct gfs2_inum __pad4; /* Unused even in current gfs1 */
293 __be64 di_eattr; /* extended attribute block number */
294 __be32 di_atime_nsec; /* nsec portion of atime */
295 __be32 di_mtime_nsec; /* nsec portion of mtime */
296 __be32 di_ctime_nsec; /* nsec portion of ctime */
298 __u8 di_reserved[44];
302 * directory structure - many of these per directory file
305 #define GFS2_FNAMESIZE 255
306 #define GFS2_DIRENT_SIZE(name_len) ((sizeof(struct gfs2_dirent) + (name_len) + 7) & ~7)
309 struct gfs2_inum de_inum;
318 * Header of leaf directory nodes
322 struct gfs2_meta_header lf_header;
324 __be16 lf_depth; /* Depth of leaf */
325 __be16 lf_entries; /* Number of dirents in leaf */
326 __be32 lf_dirent_format; /* Format of the dirents */
327 __be64 lf_next; /* Next leaf, if overflow */
329 __u8 lf_reserved[64];
333 * Extended attribute header format
336 #define GFS2_EA_MAX_NAME_LEN 255
337 #define GFS2_EA_MAX_DATA_LEN 65536
339 #define GFS2_EATYPE_UNUSED 0
340 #define GFS2_EATYPE_USR 1
341 #define GFS2_EATYPE_SYS 2
342 #define GFS2_EATYPE_SECURITY 3
344 #define GFS2_EATYPE_LAST 3
345 #define GFS2_EATYPE_VALID(x) ((x) <= GFS2_EATYPE_LAST)
347 #define GFS2_EAFLAG_LAST 0x01 /* last ea in block */
349 struct gfs2_ea_header {
352 __u8 ea_name_len; /* no NULL pointer after the string */
353 __u8 ea_type; /* GFS2_EATYPE_... */
354 __u8 ea_flags; /* GFS2_EAFLAG_... */
360 * Log header structure
363 #define GFS2_LOG_HEAD_UNMOUNT 0x00000001 /* log is clean */
365 struct gfs2_log_header {
366 struct gfs2_meta_header lh_header;
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 */
376 * Log type descriptor
379 #define GFS2_LOG_DESC_METADATA 300
380 /* ld_data1 is the number of metadata blocks in the descriptor.
381 ld_data2 is unused. */
383 #define GFS2_LOG_DESC_REVOKE 301
384 /* ld_data1 is the number of revoke blocks in the descriptor.
385 ld_data2 is unused. */
387 #define GFS2_LOG_DESC_JDATA 302
388 /* ld_data1 is the number of data blocks in the descriptor.
389 ld_data2 is unused. */
391 struct gfs2_log_descriptor {
392 struct gfs2_meta_header ld_header;
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 */
399 __u8 ld_reserved[32];
404 * Describe a range of formal inode numbers allocated to
405 * one machine to assign to inodes.
408 #define GFS2_INUM_QUANTUM 1048576
410 struct gfs2_inum_range {
417 * Describes an change to the pool of free and allocated
421 struct gfs2_statfs_change {
429 * Describes an allocation change for a particular
433 #define GFS2_QCF_USER 0x00000001
435 struct gfs2_quota_change {
437 __be32 qc_flags; /* GFS2_QCF_... */
441 struct gfs2_quota_lvb {
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 */
449 #endif /* __GFS2_ONDISK_DOT_H__ */