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