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 #include <linux/types.h>
15 #define GFS2_MAGIC 0x01161970
16 #define GFS2_BASIC_BLOCK 512
17 #define GFS2_BASIC_BLOCK_SHIFT 9
19 /* Lock numbers of the LM_TYPE_NONDISK type */
21 #define GFS2_MOUNT_LOCK 0
22 #define GFS2_LIVE_LOCK 1
23 #define GFS2_TRANS_LOCK 2
24 #define GFS2_RENAME_LOCK 3
26 /* Format numbers for various metadata types */
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
51 * An on-disk inode number
60 * Generic metadata head structure
61 * Every inplace buffer logged in the journal must start with this.
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
79 struct gfs2_meta_header {
82 __be64 __pad0; /* Was generation number in gfs1 */
84 /* This union is to keep userspace happy */
86 __be32 mh_jid; /* Was incarnation number in gfs1 */
92 * super-block structure
94 * It's probably good if SIZEOF_SB <= GFS2_BASIC_BLOCK (512 bytes)
96 * Order is important, need to be able to read old superblocks to do on-disk
100 /* Address of superblock in GFS2 basic blocks */
101 #define GFS2_SB_ADDR 128
103 /* The lock number for the superblock (must be zero) */
104 #define GFS2_SB_LOCK 0
106 /* Requirement: GFS2_LOCKNAME_LEN % 8 == 0
107 Includes: the fencing zero at the end */
108 #define GFS2_LOCKNAME_LEN 64
111 struct gfs2_meta_header sb_header;
114 __be32 sb_multihost_format;
115 __u32 __pad0; /* Was superblock flags in gfs1 */
118 __be32 sb_bsize_shift;
119 __u32 __pad1; /* Was journal segment size in gfs1 */
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;
125 char sb_lockproto[GFS2_LOCKNAME_LEN];
126 char sb_locktable[GFS2_LOCKNAME_LEN];
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 */
135 * resource index structure
139 __be64 ri_addr; /* grp block disk address */
140 __be32 ri_length; /* length of rgrp header in fs blocks */
143 __be64 ri_data0; /* first data location */
144 __be32 ri_data; /* num of data blocks in rgrp */
146 __be32 ri_bitbytes; /* number of bytes in data bitmaps */
148 __u8 ri_reserved[64];
152 * resource group header structure
155 /* Number of blocks per byte in rgrp */
157 #define GFS2_BIT_SIZE 2
158 #define GFS2_BIT_MASK 0x00000003
160 #define GFS2_BLKST_FREE 0
161 #define GFS2_BLKST_USED 1
162 #define GFS2_BLKST_UNLINKED 2
163 #define GFS2_BLKST_DINODE 3
165 #define GFS2_RGF_JOURNAL 0x00000001
166 #define GFS2_RGF_METAONLY 0x00000002
167 #define GFS2_RGF_DATAONLY 0x00000004
168 #define GFS2_RGF_NOALLOC 0x00000008
171 struct gfs2_meta_header rg_header;
177 __be64 rg_igeneration;
179 __u8 rg_reserved[80]; /* Several fields from gfs1 now reserved */
190 __u8 qu_reserved[64];
197 #define GFS2_MAX_META_HEIGHT 10
198 #define GFS2_DIR_MAX_DEPTH 17
200 #define DT2IF(dt) (((dt) << 12) & S_IFMT)
201 #define IF2DT(sif) (((sif) & S_IFMT) >> 12)
207 gfs2fl_EaIndirect = 3,
209 gfs2fl_Immutable = 5,
210 gfs2fl_AppendOnly = 6,
214 gfs2fl_TruncInProg = 29,
215 gfs2fl_InheritDirectio = 30,
216 gfs2fl_InheritJdata = 31,
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
235 struct gfs2_meta_header di_header;
237 struct gfs2_inum di_num;
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 */
251 /* This section varies from gfs1. Padding added to align with
252 * remainder of dinode
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 */
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 */
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 */
269 struct gfs2_inum __pad4; /* Unused even in current gfs1 */
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 */
276 __u8 di_reserved[44];
280 * directory structure - many of these per directory file
283 #define GFS2_FNAMESIZE 255
284 #define GFS2_DIRENT_SIZE(name_len) ((sizeof(struct gfs2_dirent) + (name_len) + 7) & ~7)
287 struct gfs2_inum de_inum;
296 * Header of leaf directory nodes
300 struct gfs2_meta_header lf_header;
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 */
307 __u8 lf_reserved[64];
311 * Extended attribute header format
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.
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.
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.
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__ */