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 #include <linux/types.h> 14 15 #define GFS2_MAGIC 0x01161970 16 #define GFS2_BASIC_BLOCK 512 17 #define GFS2_BASIC_BLOCK_SHIFT 9 18 19 /* Lock numbers of the LM_TYPE_NONDISK type */ 20 21 #define GFS2_MOUNT_LOCK 0 22 #define GFS2_LIVE_LOCK 1 23 #define GFS2_FREEZE_LOCK 2 24 #define GFS2_RENAME_LOCK 3 25 #define GFS2_CONTROL_LOCK 4 26 #define GFS2_MOUNTED_LOCK 5 27 28 /* Format numbers for various metadata types */ 29 30 #define GFS2_FORMAT_NONE 0 31 #define GFS2_FORMAT_SB 100 32 #define GFS2_FORMAT_RG 200 33 #define GFS2_FORMAT_RB 300 34 #define GFS2_FORMAT_DI 400 35 #define GFS2_FORMAT_IN 500 36 #define GFS2_FORMAT_LF 600 37 #define GFS2_FORMAT_JD 700 38 #define GFS2_FORMAT_LH 800 39 #define GFS2_FORMAT_LD 900 40 #define GFS2_FORMAT_LB 1000 41 #define GFS2_FORMAT_EA 1600 42 #define GFS2_FORMAT_ED 1700 43 #define GFS2_FORMAT_QC 1400 44 /* These are format numbers for entities contained in files */ 45 #define GFS2_FORMAT_RI 1100 46 #define GFS2_FORMAT_DE 1200 47 #define GFS2_FORMAT_QU 1500 48 /* These are part of the superblock */ 49 #define GFS2_FORMAT_FS 1801 50 #define GFS2_FORMAT_MULTI 1900 51 52 /* 53 * An on-disk inode number 54 */ 55 56 struct gfs2_inum { 57 __be64 no_formal_ino; 58 __be64 no_addr; 59 }; 60 61 /* 62 * Generic metadata head structure 63 * Every inplace buffer logged in the journal must start with this. 64 */ 65 66 #define GFS2_METATYPE_NONE 0 67 #define GFS2_METATYPE_SB 1 68 #define GFS2_METATYPE_RG 2 69 #define GFS2_METATYPE_RB 3 70 #define GFS2_METATYPE_DI 4 71 #define GFS2_METATYPE_IN 5 72 #define GFS2_METATYPE_LF 6 73 #define GFS2_METATYPE_JD 7 74 #define GFS2_METATYPE_LH 8 75 #define GFS2_METATYPE_LD 9 76 #define GFS2_METATYPE_LB 12 77 #define GFS2_METATYPE_EA 10 78 #define GFS2_METATYPE_ED 11 79 #define GFS2_METATYPE_QC 14 80 81 struct gfs2_meta_header { 82 __be32 mh_magic; 83 __be32 mh_type; 84 __be64 __pad0; /* Was generation number in gfs1 */ 85 __be32 mh_format; 86 /* This union is to keep userspace happy */ 87 union { 88 __be32 mh_jid; /* Was incarnation number in gfs1 */ 89 __be32 __pad1; 90 }; 91 }; 92 93 /* 94 * super-block structure 95 * 96 * It's probably good if SIZEOF_SB <= GFS2_BASIC_BLOCK (512 bytes) 97 * 98 * Order is important, need to be able to read old superblocks to do on-disk 99 * version upgrades. 100 */ 101 102 /* Address of superblock in GFS2 basic blocks */ 103 #define GFS2_SB_ADDR 128 104 105 /* The lock number for the superblock (must be zero) */ 106 #define GFS2_SB_LOCK 0 107 108 /* Requirement: GFS2_LOCKNAME_LEN % 8 == 0 109 Includes: the fencing zero at the end */ 110 #define GFS2_LOCKNAME_LEN 64 111 112 struct gfs2_sb { 113 struct gfs2_meta_header sb_header; 114 115 __be32 sb_fs_format; 116 __be32 sb_multihost_format; 117 __u32 __pad0; /* Was superblock flags in gfs1 */ 118 119 __be32 sb_bsize; 120 __be32 sb_bsize_shift; 121 __u32 __pad1; /* Was journal segment size in gfs1 */ 122 123 struct gfs2_inum sb_master_dir; /* Was jindex dinode in gfs1 */ 124 struct gfs2_inum __pad2; /* Was rindex dinode in gfs1 */ 125 struct gfs2_inum sb_root_dir; 126 127 char sb_lockproto[GFS2_LOCKNAME_LEN]; 128 char sb_locktable[GFS2_LOCKNAME_LEN]; 129 130 struct gfs2_inum __pad3; /* Was quota inode in gfs1 */ 131 struct gfs2_inum __pad4; /* Was licence inode in gfs1 */ 132 #define GFS2_HAS_UUID 1 133 __u8 sb_uuid[16]; /* The UUID, maybe 0 for backwards compat */ 134 }; 135 136 /* 137 * resource index structure 138 */ 139 140 struct gfs2_rindex { 141 __be64 ri_addr; /* grp block disk address */ 142 __be32 ri_length; /* length of rgrp header in fs blocks */ 143 __u32 __pad; 144 145 __be64 ri_data0; /* first data location */ 146 __be32 ri_data; /* num of data blocks in rgrp */ 147 148 __be32 ri_bitbytes; /* number of bytes in data bitmaps */ 149 150 __u8 ri_reserved[64]; 151 }; 152 153 /* 154 * resource group header structure 155 */ 156 157 /* Number of blocks per byte in rgrp */ 158 #define GFS2_NBBY 4 159 #define GFS2_BIT_SIZE 2 160 #define GFS2_BIT_MASK 0x00000003 161 162 #define GFS2_BLKST_FREE 0 163 #define GFS2_BLKST_USED 1 164 #define GFS2_BLKST_UNLINKED 2 165 #define GFS2_BLKST_DINODE 3 166 167 #define GFS2_RGF_JOURNAL 0x00000001 168 #define GFS2_RGF_METAONLY 0x00000002 169 #define GFS2_RGF_DATAONLY 0x00000004 170 #define GFS2_RGF_NOALLOC 0x00000008 171 #define GFS2_RGF_TRIMMED 0x00000010 172 173 struct gfs2_rgrp_lvb { 174 __be32 rl_magic; 175 __be32 rl_flags; 176 __be32 rl_free; 177 __be32 rl_dinodes; 178 __be64 rl_igeneration; 179 __be32 rl_unlinked; 180 __be32 __pad; 181 }; 182 183 struct gfs2_rgrp { 184 struct gfs2_meta_header rg_header; 185 186 __be32 rg_flags; 187 __be32 rg_free; 188 __be32 rg_dinodes; 189 __be32 __pad; 190 __be64 rg_igeneration; 191 192 __u8 rg_reserved[80]; /* Several fields from gfs1 now reserved */ 193 }; 194 195 /* 196 * quota structure 197 */ 198 199 struct gfs2_quota { 200 __be64 qu_limit; 201 __be64 qu_warn; 202 __be64 qu_value; 203 __u8 qu_reserved[64]; 204 }; 205 206 /* 207 * dinode structure 208 */ 209 210 #define GFS2_MAX_META_HEIGHT 10 211 #define GFS2_DIR_MAX_DEPTH 17 212 213 #define DT2IF(dt) (((dt) << 12) & S_IFMT) 214 #define IF2DT(sif) (((sif) & S_IFMT) >> 12) 215 216 enum { 217 gfs2fl_Jdata = 0, 218 gfs2fl_ExHash = 1, 219 gfs2fl_Unused = 2, 220 gfs2fl_EaIndirect = 3, 221 gfs2fl_Directio = 4, 222 gfs2fl_Immutable = 5, 223 gfs2fl_AppendOnly = 6, 224 gfs2fl_NoAtime = 7, 225 gfs2fl_Sync = 8, 226 gfs2fl_System = 9, 227 gfs2fl_TopLevel = 10, 228 gfs2fl_TruncInProg = 29, 229 gfs2fl_InheritDirectio = 30, 230 gfs2fl_InheritJdata = 31, 231 }; 232 233 /* Dinode flags */ 234 #define GFS2_DIF_JDATA 0x00000001 235 #define GFS2_DIF_EXHASH 0x00000002 236 #define GFS2_DIF_UNUSED 0x00000004 /* only in gfs1 */ 237 #define GFS2_DIF_EA_INDIRECT 0x00000008 238 #define GFS2_DIF_DIRECTIO 0x00000010 239 #define GFS2_DIF_IMMUTABLE 0x00000020 240 #define GFS2_DIF_APPENDONLY 0x00000040 241 #define GFS2_DIF_NOATIME 0x00000080 242 #define GFS2_DIF_SYNC 0x00000100 243 #define GFS2_DIF_SYSTEM 0x00000200 /* New in gfs2 */ 244 #define GFS2_DIF_TOPDIR 0x00000400 /* New in gfs2 */ 245 #define GFS2_DIF_TRUNC_IN_PROG 0x20000000 /* New in gfs2 */ 246 #define GFS2_DIF_INHERIT_DIRECTIO 0x40000000 /* only in gfs1 */ 247 #define GFS2_DIF_INHERIT_JDATA 0x80000000 248 249 struct gfs2_dinode { 250 struct gfs2_meta_header di_header; 251 252 struct gfs2_inum di_num; 253 254 __be32 di_mode; /* mode of file */ 255 __be32 di_uid; /* owner's user id */ 256 __be32 di_gid; /* owner's group id */ 257 __be32 di_nlink; /* number of links to this file */ 258 __be64 di_size; /* number of bytes in file */ 259 __be64 di_blocks; /* number of blocks in file */ 260 __be64 di_atime; /* time last accessed */ 261 __be64 di_mtime; /* time last modified */ 262 __be64 di_ctime; /* time last changed */ 263 __be32 di_major; /* device major number */ 264 __be32 di_minor; /* device minor number */ 265 266 /* This section varies from gfs1. Padding added to align with 267 * remainder of dinode 268 */ 269 __be64 di_goal_meta; /* rgrp to alloc from next */ 270 __be64 di_goal_data; /* data block goal */ 271 __be64 di_generation; /* generation number for NFS */ 272 273 __be32 di_flags; /* GFS2_DIF_... */ 274 __be32 di_payload_format; /* GFS2_FORMAT_... */ 275 __u16 __pad1; /* Was ditype in gfs1 */ 276 __be16 di_height; /* height of metadata */ 277 __u32 __pad2; /* Unused incarnation number from gfs1 */ 278 279 /* These only apply to directories */ 280 __u16 __pad3; /* Padding */ 281 __be16 di_depth; /* Number of bits in the table */ 282 __be32 di_entries; /* The number of entries in the directory */ 283 284 struct gfs2_inum __pad4; /* Unused even in current gfs1 */ 285 286 __be64 di_eattr; /* extended attribute block number */ 287 __be32 di_atime_nsec; /* nsec portion of atime */ 288 __be32 di_mtime_nsec; /* nsec portion of mtime */ 289 __be32 di_ctime_nsec; /* nsec portion of ctime */ 290 291 __u8 di_reserved[44]; 292 }; 293 294 /* 295 * directory structure - many of these per directory file 296 */ 297 298 #define GFS2_FNAMESIZE 255 299 #define GFS2_DIRENT_SIZE(name_len) ((sizeof(struct gfs2_dirent) + (name_len) + 7) & ~7) 300 301 struct gfs2_dirent { 302 struct gfs2_inum de_inum; 303 __be32 de_hash; 304 __be16 de_rec_len; 305 __be16 de_name_len; 306 __be16 de_type; 307 union { 308 __u8 __pad[14]; 309 struct { 310 __be16 de_rahead; 311 __u8 pad2[12]; 312 }; 313 }; 314 }; 315 316 /* 317 * Header of leaf directory nodes 318 */ 319 320 struct gfs2_leaf { 321 struct gfs2_meta_header lf_header; 322 323 __be16 lf_depth; /* Depth of leaf */ 324 __be16 lf_entries; /* Number of dirents in leaf */ 325 __be32 lf_dirent_format; /* Format of the dirents */ 326 __be64 lf_next; /* Next leaf, if overflow */ 327 328 union { 329 __u8 lf_reserved[64]; 330 struct { 331 __be64 lf_inode; /* Dir inode number */ 332 __be32 lf_dist; /* Dist from inode on chain */ 333 __be32 lf_nsec; /* Last ins/del usecs */ 334 __be64 lf_sec; /* Last ins/del in secs */ 335 __u8 lf_reserved2[40]; 336 }; 337 }; 338 }; 339 340 /* 341 * Extended attribute header format 342 * 343 * This works in a similar way to dirents. There is a fixed size header 344 * followed by a variable length section made up of the name and the 345 * associated data. In the case of a "stuffed" entry, the value is 346 * inline directly after the name, the ea_num_ptrs entry will be 347 * zero in that case. For non-"stuffed" entries, there will be 348 * a set of pointers (aligned to 8 byte boundary) to the block(s) 349 * containing the value. 350 * 351 * The blocks containing the values and the blocks containing the 352 * extended attribute headers themselves all start with the common 353 * metadata header. Each inode, if it has extended attributes, will 354 * have either a single block containing the extended attribute headers 355 * or a single indirect block pointing to blocks containing the 356 * extended attribute headers. 357 * 358 * The maximum size of the data part of an extended attribute is 64k 359 * so the number of blocks required depends upon block size. Since the 360 * block size also determines the number of pointers in an indirect 361 * block, its a fairly complicated calculation to work out the maximum 362 * number of blocks that an inode may have relating to extended attributes. 363 * 364 */ 365 366 #define GFS2_EA_MAX_NAME_LEN 255 367 #define GFS2_EA_MAX_DATA_LEN 65536 368 369 #define GFS2_EATYPE_UNUSED 0 370 #define GFS2_EATYPE_USR 1 371 #define GFS2_EATYPE_SYS 2 372 #define GFS2_EATYPE_SECURITY 3 373 374 #define GFS2_EATYPE_LAST 3 375 #define GFS2_EATYPE_VALID(x) ((x) <= GFS2_EATYPE_LAST) 376 377 #define GFS2_EAFLAG_LAST 0x01 /* last ea in block */ 378 379 struct gfs2_ea_header { 380 __be32 ea_rec_len; 381 __be32 ea_data_len; 382 __u8 ea_name_len; /* no NULL pointer after the string */ 383 __u8 ea_type; /* GFS2_EATYPE_... */ 384 __u8 ea_flags; /* GFS2_EAFLAG_... */ 385 __u8 ea_num_ptrs; 386 __u32 __pad; 387 }; 388 389 /* 390 * Log header structure 391 */ 392 393 #define GFS2_LOG_HEAD_UNMOUNT 0x00000001 /* log is clean */ 394 395 struct gfs2_log_header { 396 struct gfs2_meta_header lh_header; 397 398 __be64 lh_sequence; /* Sequence number of this transaction */ 399 __be32 lh_flags; /* GFS2_LOG_HEAD_... */ 400 __be32 lh_tail; /* Block number of log tail */ 401 __be32 lh_blkno; 402 __be32 lh_hash; 403 }; 404 405 /* 406 * Log type descriptor 407 */ 408 409 #define GFS2_LOG_DESC_METADATA 300 410 /* ld_data1 is the number of metadata blocks in the descriptor. 411 ld_data2 is unused. */ 412 413 #define GFS2_LOG_DESC_REVOKE 301 414 /* ld_data1 is the number of revoke blocks in the descriptor. 415 ld_data2 is unused. */ 416 417 #define GFS2_LOG_DESC_JDATA 302 418 /* ld_data1 is the number of data blocks in the descriptor. 419 ld_data2 is unused. */ 420 421 struct gfs2_log_descriptor { 422 struct gfs2_meta_header ld_header; 423 424 __be32 ld_type; /* GFS2_LOG_DESC_... */ 425 __be32 ld_length; /* Number of buffers in this chunk */ 426 __be32 ld_data1; /* descriptor-specific field */ 427 __be32 ld_data2; /* descriptor-specific field */ 428 429 __u8 ld_reserved[32]; 430 }; 431 432 /* 433 * Inum Range 434 * Describe a range of formal inode numbers allocated to 435 * one machine to assign to inodes. 436 */ 437 438 #define GFS2_INUM_QUANTUM 1048576 439 440 struct gfs2_inum_range { 441 __be64 ir_start; 442 __be64 ir_length; 443 }; 444 445 /* 446 * Statfs change 447 * Describes an change to the pool of free and allocated 448 * blocks. 449 */ 450 451 struct gfs2_statfs_change { 452 __be64 sc_total; 453 __be64 sc_free; 454 __be64 sc_dinodes; 455 }; 456 457 /* 458 * Quota change 459 * Describes an allocation change for a particular 460 * user or group. 461 */ 462 463 #define GFS2_QCF_USER 0x00000001 464 465 struct gfs2_quota_change { 466 __be64 qc_change; 467 __be32 qc_flags; /* GFS2_QCF_... */ 468 __be32 qc_id; 469 }; 470 471 struct gfs2_quota_lvb { 472 __be32 qb_magic; 473 __u32 __pad; 474 __be64 qb_limit; /* Hard limit of # blocks to alloc */ 475 __be64 qb_warn; /* Warn user when alloc is above this # */ 476 __be64 qb_value; /* Current # blocks allocated */ 477 }; 478 479 #endif /* __GFS2_ONDISK_DOT_H__ */ 480
