gfs2_ondisk.h (14772B) - Raw
1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2 /* 3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 4 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. 5 * 6 * This copyrighted material is made available to anyone wishing to use, 7 * modify, copy, or redistribute it subject to the terms and conditions 8 * of the GNU General Public License v.2. 9 */ 10 11 #ifndef __GFS2_ONDISK_DOT_H__ 12 #define __GFS2_ONDISK_DOT_H__ 13 14 #include <linux/types.h> 15 16 #define GFS2_MAGIC 0x01161970 17 #define GFS2_BASIC_BLOCK 512 18 #define GFS2_BASIC_BLOCK_SHIFT 9 19 20 /* Lock numbers of the LM_TYPE_NONDISK type */ 21 22 #define GFS2_MOUNT_LOCK 0 23 #define GFS2_LIVE_LOCK 1 24 #define GFS2_FREEZE_LOCK 2 25 #define GFS2_RENAME_LOCK 3 26 #define GFS2_CONTROL_LOCK 4 27 #define GFS2_MOUNTED_LOCK 5 28 29 /* Format numbers for various metadata types */ 30 31 #define GFS2_FORMAT_NONE 0 32 #define GFS2_FORMAT_SB 100 33 #define GFS2_FORMAT_RG 200 34 #define GFS2_FORMAT_RB 300 35 #define GFS2_FORMAT_DI 400 36 #define GFS2_FORMAT_IN 500 37 #define GFS2_FORMAT_LF 600 38 #define GFS2_FORMAT_JD 700 39 #define GFS2_FORMAT_LH 800 40 #define GFS2_FORMAT_LD 900 41 #define GFS2_FORMAT_LB 1000 42 #define GFS2_FORMAT_EA 1600 43 #define GFS2_FORMAT_ED 1700 44 #define GFS2_FORMAT_QC 1400 45 /* These are format numbers for entities contained in files */ 46 #define GFS2_FORMAT_RI 1100 47 #define GFS2_FORMAT_DE 1200 48 #define GFS2_FORMAT_QU 1500 49 /* These are part of the superblock */ 50 #define GFS2_FORMAT_FS 1802 51 #define GFS2_FORMAT_MULTI 1900 52 53 /* 54 * An on-disk inode number 55 */ 56 57 struct gfs2_inum { 58 __be64 no_formal_ino; 59 __be64 no_addr; 60 }; 61 62 /* 63 * Generic metadata head structure 64 * Every inplace buffer logged in the journal must start with this. 65 */ 66 67 #define GFS2_METATYPE_NONE 0 68 #define GFS2_METATYPE_SB 1 69 #define GFS2_METATYPE_RG 2 70 #define GFS2_METATYPE_RB 3 71 #define GFS2_METATYPE_DI 4 72 #define GFS2_METATYPE_IN 5 73 #define GFS2_METATYPE_LF 6 74 #define GFS2_METATYPE_JD 7 75 #define GFS2_METATYPE_LH 8 76 #define GFS2_METATYPE_LD 9 77 #define GFS2_METATYPE_LB 12 78 #define GFS2_METATYPE_EA 10 79 #define GFS2_METATYPE_ED 11 80 #define GFS2_METATYPE_QC 14 81 82 struct gfs2_meta_header { 83 __be32 mh_magic; 84 __be32 mh_type; 85 __be64 __pad0; /* Was generation number in gfs1 */ 86 __be32 mh_format; 87 /* This union is to keep userspace happy */ 88 union { 89 __be32 mh_jid; /* Was incarnation number in gfs1 */ 90 __be32 __pad1; 91 }; 92 }; 93 94 /* 95 * super-block structure 96 * 97 * It's probably good if SIZEOF_SB <= GFS2_BASIC_BLOCK (512 bytes) 98 * 99 * Order is important, need to be able to read old superblocks to do on-disk 100 * version upgrades. 101 */ 102 103 /* Address of superblock in GFS2 basic blocks */ 104 #define GFS2_SB_ADDR 128 105 106 /* The lock number for the superblock (must be zero) */ 107 #define GFS2_SB_LOCK 0 108 109 /* Requirement: GFS2_LOCKNAME_LEN % 8 == 0 110 Includes: the fencing zero at the end */ 111 #define GFS2_LOCKNAME_LEN 64 112 113 struct gfs2_sb { 114 struct gfs2_meta_header sb_header; 115 116 __be32 sb_fs_format; 117 __be32 sb_multihost_format; 118 __u32 __pad0; /* Was superblock flags in gfs1 */ 119 120 __be32 sb_bsize; 121 __be32 sb_bsize_shift; 122 __u32 __pad1; /* Was journal segment size in gfs1 */ 123 124 struct gfs2_inum sb_master_dir; /* Was jindex dinode in gfs1 */ 125 struct gfs2_inum __pad2; /* Was rindex dinode in gfs1 */ 126 struct gfs2_inum sb_root_dir; 127 128 char sb_lockproto[GFS2_LOCKNAME_LEN]; 129 char sb_locktable[GFS2_LOCKNAME_LEN]; 130 131 struct gfs2_inum __pad3; /* Was quota inode in gfs1 */ 132 struct gfs2_inum __pad4; /* Was licence inode in gfs1 */ 133 #define GFS2_HAS_UUID 1 134 __u8 sb_uuid[16]; /* The UUID, maybe 0 for backwards compat */ 135 }; 136 137 /* 138 * resource index structure 139 */ 140 141 struct gfs2_rindex { 142 __be64 ri_addr; /* grp block disk address */ 143 __be32 ri_length; /* length of rgrp header in fs blocks */ 144 __u32 __pad; 145 146 __be64 ri_data0; /* first data location */ 147 __be32 ri_data; /* num of data blocks in rgrp */ 148 149 __be32 ri_bitbytes; /* number of bytes in data bitmaps */ 150 151 __u8 ri_reserved[64]; 152 }; 153 154 /* 155 * resource group header structure 156 */ 157 158 /* Number of blocks per byte in rgrp */ 159 #define GFS2_NBBY 4 160 #define GFS2_BIT_SIZE 2 161 #define GFS2_BIT_MASK 0x00000003 162 163 #define GFS2_BLKST_FREE 0 164 #define GFS2_BLKST_USED 1 165 #define GFS2_BLKST_UNLINKED 2 166 #define GFS2_BLKST_DINODE 3 167 168 #define GFS2_RGF_JOURNAL 0x00000001 169 #define GFS2_RGF_METAONLY 0x00000002 170 #define GFS2_RGF_DATAONLY 0x00000004 171 #define GFS2_RGF_NOALLOC 0x00000008 172 #define GFS2_RGF_TRIMMED 0x00000010 173 174 struct gfs2_inode_lvb { 175 __be32 ri_magic; 176 __be32 __pad; 177 __be64 ri_generation_deleted; 178 }; 179 180 struct gfs2_rgrp_lvb { 181 __be32 rl_magic; 182 __be32 rl_flags; 183 __be32 rl_free; 184 __be32 rl_dinodes; 185 __be64 rl_igeneration; 186 __be32 rl_unlinked; 187 __be32 __pad; 188 }; 189 190 struct gfs2_rgrp { 191 struct gfs2_meta_header rg_header; 192 193 __be32 rg_flags; 194 __be32 rg_free; 195 __be32 rg_dinodes; 196 union { 197 __be32 __pad; 198 __be32 rg_skip; /* Distance to the next rgrp in fs blocks */ 199 }; 200 __be64 rg_igeneration; 201 /* The following 3 fields are duplicated from gfs2_rindex to reduce 202 reliance on the rindex */ 203 __be64 rg_data0; /* First data location */ 204 __be32 rg_data; /* Number of data blocks in rgrp */ 205 __be32 rg_bitbytes; /* Number of bytes in data bitmaps */ 206 __be32 rg_crc; /* crc32 of the structure with this field 0 */ 207 208 __u8 rg_reserved[60]; /* Several fields from gfs1 now reserved */ 209 }; 210 211 /* 212 * quota structure 213 */ 214 215 struct gfs2_quota { 216 __be64 qu_limit; 217 __be64 qu_warn; 218 __be64 qu_value; 219 __u8 qu_reserved[64]; 220 }; 221 222 /* 223 * dinode structure 224 */ 225 226 #define GFS2_MAX_META_HEIGHT 10 227 #define GFS2_DIR_MAX_DEPTH 17 228 229 #define DT2IF(dt) (((dt) << 12) & S_IFMT) 230 #define IF2DT(sif) (((sif) & S_IFMT) >> 12) 231 232 enum { 233 gfs2fl_Jdata = 0, 234 gfs2fl_ExHash = 1, 235 gfs2fl_Unused = 2, 236 gfs2fl_EaIndirect = 3, 237 gfs2fl_Directio = 4, 238 gfs2fl_Immutable = 5, 239 gfs2fl_AppendOnly = 6, 240 gfs2fl_NoAtime = 7, 241 gfs2fl_Sync = 8, 242 gfs2fl_System = 9, 243 gfs2fl_TopLevel = 10, 244 gfs2fl_TruncInProg = 29, 245 gfs2fl_InheritDirectio = 30, 246 gfs2fl_InheritJdata = 31, 247 }; 248 249 /* Dinode flags */ 250 #define GFS2_DIF_JDATA 0x00000001 251 #define GFS2_DIF_EXHASH 0x00000002 252 #define GFS2_DIF_UNUSED 0x00000004 /* only in gfs1 */ 253 #define GFS2_DIF_EA_INDIRECT 0x00000008 254 #define GFS2_DIF_DIRECTIO 0x00000010 255 #define GFS2_DIF_IMMUTABLE 0x00000020 256 #define GFS2_DIF_APPENDONLY 0x00000040 257 #define GFS2_DIF_NOATIME 0x00000080 258 #define GFS2_DIF_SYNC 0x00000100 259 #define GFS2_DIF_SYSTEM 0x00000200 /* New in gfs2 */ 260 #define GFS2_DIF_TOPDIR 0x00000400 /* New in gfs2 */ 261 #define GFS2_DIF_TRUNC_IN_PROG 0x20000000 /* New in gfs2 */ 262 #define GFS2_DIF_INHERIT_DIRECTIO 0x40000000 /* only in gfs1 */ 263 #define GFS2_DIF_INHERIT_JDATA 0x80000000 264 265 struct gfs2_dinode { 266 struct gfs2_meta_header di_header; 267 268 struct gfs2_inum di_num; 269 270 __be32 di_mode; /* mode of file */ 271 __be32 di_uid; /* owner's user id */ 272 __be32 di_gid; /* owner's group id */ 273 __be32 di_nlink; /* number of links to this file */ 274 __be64 di_size; /* number of bytes in file */ 275 __be64 di_blocks; /* number of blocks in file */ 276 __be64 di_atime; /* time last accessed */ 277 __be64 di_mtime; /* time last modified */ 278 __be64 di_ctime; /* time last changed */ 279 __be32 di_major; /* device major number */ 280 __be32 di_minor; /* device minor number */ 281 282 /* This section varies from gfs1. Padding added to align with 283 * remainder of dinode 284 */ 285 __be64 di_goal_meta; /* rgrp to alloc from next */ 286 __be64 di_goal_data; /* data block goal */ 287 __be64 di_generation; /* generation number for NFS */ 288 289 __be32 di_flags; /* GFS2_DIF_... */ 290 __be32 di_payload_format; /* GFS2_FORMAT_... */ 291 __u16 __pad1; /* Was ditype in gfs1 */ 292 __be16 di_height; /* height of metadata */ 293 __u32 __pad2; /* Unused incarnation number from gfs1 */ 294 295 /* These only apply to directories */ 296 __u16 __pad3; /* Padding */ 297 __be16 di_depth; /* Number of bits in the table */ 298 __be32 di_entries; /* The number of entries in the directory */ 299 300 struct gfs2_inum __pad4; /* Unused even in current gfs1 */ 301 302 __be64 di_eattr; /* extended attribute block number */ 303 __be32 di_atime_nsec; /* nsec portion of atime */ 304 __be32 di_mtime_nsec; /* nsec portion of mtime */ 305 __be32 di_ctime_nsec; /* nsec portion of ctime */ 306 307 __u8 di_reserved[44]; 308 }; 309 310 /* 311 * directory structure - many of these per directory file 312 */ 313 314 #define GFS2_FNAMESIZE 255 315 #define GFS2_DIRENT_SIZE(name_len) ((sizeof(struct gfs2_dirent) + (name_len) + 7) & ~7) 316 #define GFS2_MIN_DIRENT_SIZE (GFS2_DIRENT_SIZE(1)) 317 318 319 struct gfs2_dirent { 320 struct gfs2_inum de_inum; 321 __be32 de_hash; 322 __be16 de_rec_len; 323 __be16 de_name_len; 324 __be16 de_type; 325 __be16 de_rahead; 326 union { 327 __u8 __pad[12]; 328 struct { 329 __u32 de_cookie; /* ondisk value not used */ 330 __u8 pad3[8]; 331 }; 332 }; 333 }; 334 335 /* 336 * Header of leaf directory nodes 337 */ 338 339 struct gfs2_leaf { 340 struct gfs2_meta_header lf_header; 341 342 __be16 lf_depth; /* Depth of leaf */ 343 __be16 lf_entries; /* Number of dirents in leaf */ 344 __be32 lf_dirent_format; /* Format of the dirents */ 345 __be64 lf_next; /* Next leaf, if overflow */ 346 347 union { 348 __u8 lf_reserved[64]; 349 struct { 350 __be64 lf_inode; /* Dir inode number */ 351 __be32 lf_dist; /* Dist from inode on chain */ 352 __be32 lf_nsec; /* Last ins/del usecs */ 353 __be64 lf_sec; /* Last ins/del in secs */ 354 __u8 lf_reserved2[40]; 355 }; 356 }; 357 }; 358 359 /* 360 * Extended attribute header format 361 * 362 * This works in a similar way to dirents. There is a fixed size header 363 * followed by a variable length section made up of the name and the 364 * associated data. In the case of a "stuffed" entry, the value is 365 * __inline__ directly after the name, the ea_num_ptrs entry will be 366 * zero in that case. For non-"stuffed" entries, there will be 367 * a set of pointers (aligned to 8 byte boundary) to the block(s) 368 * containing the value. 369 * 370 * The blocks containing the values and the blocks containing the 371 * extended attribute headers themselves all start with the common 372 * metadata header. Each inode, if it has extended attributes, will 373 * have either a single block containing the extended attribute headers 374 * or a single indirect block pointing to blocks containing the 375 * extended attribute headers. 376 * 377 * The maximum size of the data part of an extended attribute is 64k 378 * so the number of blocks required depends upon block size. Since the 379 * block size also determines the number of pointers in an indirect 380 * block, its a fairly complicated calculation to work out the maximum 381 * number of blocks that an inode may have relating to extended attributes. 382 * 383 */ 384 385 #define GFS2_EA_MAX_NAME_LEN 255 386 #define GFS2_EA_MAX_DATA_LEN 65536 387 388 #define GFS2_EATYPE_UNUSED 0 389 #define GFS2_EATYPE_USR 1 390 #define GFS2_EATYPE_SYS 2 391 #define GFS2_EATYPE_SECURITY 3 392 #define GFS2_EATYPE_TRUSTED 4 393 394 #define GFS2_EATYPE_LAST 4 395 #define GFS2_EATYPE_VALID(x) ((x) <= GFS2_EATYPE_LAST) 396 397 #define GFS2_EAFLAG_LAST 0x01 /* last ea in block */ 398 399 struct gfs2_ea_header { 400 __be32 ea_rec_len; 401 __be32 ea_data_len; 402 __u8 ea_name_len; /* no NULL pointer after the string */ 403 __u8 ea_type; /* GFS2_EATYPE_... */ 404 __u8 ea_flags; /* GFS2_EAFLAG_... */ 405 __u8 ea_num_ptrs; 406 __u32 __pad; 407 }; 408 409 /* 410 * Log header structure 411 */ 412 413 #define GFS2_LOG_HEAD_UNMOUNT 0x00000001 /* log is clean */ 414 #define GFS2_LOG_HEAD_FLUSH_NORMAL 0x00000002 /* normal log flush */ 415 #define GFS2_LOG_HEAD_FLUSH_SYNC 0x00000004 /* Sync log flush */ 416 #define GFS2_LOG_HEAD_FLUSH_SHUTDOWN 0x00000008 /* Shutdown log flush */ 417 #define GFS2_LOG_HEAD_FLUSH_FREEZE 0x00000010 /* Freeze flush */ 418 #define GFS2_LOG_HEAD_RECOVERY 0x00000020 /* Journal recovery */ 419 #define GFS2_LOG_HEAD_USERSPACE 0x80000000 /* Written by gfs2-utils */ 420 421 /* Log flush callers */ 422 #define GFS2_LFC_SHUTDOWN 0x00000100 423 #define GFS2_LFC_JDATA_WPAGES 0x00000200 424 #define GFS2_LFC_SET_FLAGS 0x00000400 425 #define GFS2_LFC_AIL_EMPTY_GL 0x00000800 426 #define GFS2_LFC_AIL_FLUSH 0x00001000 427 #define GFS2_LFC_RGRP_GO_SYNC 0x00002000 428 #define GFS2_LFC_INODE_GO_SYNC 0x00004000 429 #define GFS2_LFC_INODE_GO_INVAL 0x00008000 430 #define GFS2_LFC_FREEZE_GO_SYNC 0x00010000 431 #define GFS2_LFC_KILL_SB 0x00020000 432 #define GFS2_LFC_DO_SYNC 0x00040000 433 #define GFS2_LFC_INPLACE_RESERVE 0x00080000 434 #define GFS2_LFC_WRITE_INODE 0x00100000 435 #define GFS2_LFC_MAKE_FS_RO 0x00200000 436 #define GFS2_LFC_SYNC_FS 0x00400000 437 #define GFS2_LFC_EVICT_INODE 0x00800000 438 #define GFS2_LFC_TRANS_END 0x01000000 439 #define GFS2_LFC_LOGD_JFLUSH_REQD 0x02000000 440 #define GFS2_LFC_LOGD_AIL_FLUSH_REQD 0x04000000 441 442 #define LH_V1_SIZE (offsetofend(struct gfs2_log_header, lh_hash)) 443 444 struct gfs2_log_header { 445 struct gfs2_meta_header lh_header; 446 447 __be64 lh_sequence; /* Sequence number of this transaction */ 448 __be32 lh_flags; /* GFS2_LOG_HEAD_... */ 449 __be32 lh_tail; /* Block number of log tail */ 450 __be32 lh_blkno; 451 __be32 lh_hash; /* crc up to here with this field 0 */ 452 453 /* Version 2 additional fields start here */ 454 __be32 lh_crc; /* crc32c from lh_nsec to end of block */ 455 __be32 lh_nsec; /* Nanoseconds of timestamp */ 456 __be64 lh_sec; /* Seconds of timestamp */ 457 __be64 lh_addr; /* Block addr of this log header (absolute) */ 458 __be64 lh_jinode; /* Journal inode number */ 459 __be64 lh_statfs_addr; /* Local statfs inode number */ 460 __be64 lh_quota_addr; /* Local quota change inode number */ 461 462 /* Statfs local changes (i.e. diff from global statfs) */ 463 __be64 lh_local_total; 464 __be64 lh_local_free; 465 __be64 lh_local_dinodes; 466 }; 467 468 /* 469 * Log type descriptor 470 */ 471 472 #define GFS2_LOG_DESC_METADATA 300 473 /* ld_data1 is the number of metadata blocks in the descriptor. 474 ld_data2 is unused. */ 475 476 #define GFS2_LOG_DESC_REVOKE 301 477 /* ld_data1 is the number of revoke blocks in the descriptor. 478 ld_data2 is unused. */ 479 480 #define GFS2_LOG_DESC_JDATA 302 481 /* ld_data1 is the number of data blocks in the descriptor. 482 ld_data2 is unused. */ 483 484 struct gfs2_log_descriptor { 485 struct gfs2_meta_header ld_header; 486 487 __be32 ld_type; /* GFS2_LOG_DESC_... */ 488 __be32 ld_length; /* Number of buffers in this chunk */ 489 __be32 ld_data1; /* descriptor-specific field */ 490 __be32 ld_data2; /* descriptor-specific field */ 491 492 __u8 ld_reserved[32]; 493 }; 494 495 /* 496 * Inum Range 497 * Describe a range of formal inode numbers allocated to 498 * one machine to assign to inodes. 499 */ 500 501 #define GFS2_INUM_QUANTUM 1048576 502 503 struct gfs2_inum_range { 504 __be64 ir_start; 505 __be64 ir_length; 506 }; 507 508 /* 509 * Statfs change 510 * Describes an change to the pool of free and allocated 511 * blocks. 512 */ 513 514 struct gfs2_statfs_change { 515 __be64 sc_total; 516 __be64 sc_free; 517 __be64 sc_dinodes; 518 }; 519 520 /* 521 * Quota change 522 * Describes an allocation change for a particular 523 * user or group. 524 */ 525 526 #define GFS2_QCF_USER 0x00000001 527 528 struct gfs2_quota_change { 529 __be64 qc_change; 530 __be32 qc_flags; /* GFS2_QCF_... */ 531 __be32 qc_id; 532 }; 533 534 struct gfs2_quota_lvb { 535 __be32 qb_magic; 536 __u32 __pad; 537 __be64 qb_limit; /* Hard limit of # blocks to alloc */ 538 __be64 qb_warn; /* Warn user when alloc is above this # */ 539 __be64 qb_value; /* Current # blocks allocated */ 540 }; 541 542 #endif /* __GFS2_ONDISK_DOT_H__ */