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_TRANS_LOCK 2 24 #define GFS2_RENAME_LOCK 3 25 26 /* Format numbers for various metadata types */ 27 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 49 50 /* 51 * An on-disk inode number 52 */ 53 54 struct gfs2_inum { 55 __be64 no_formal_ino; 56 __be64 no_addr; 57 }; 58 59 /* 60 * Generic metadata head structure 61 * Every inplace buffer logged in the journal must start with this. 62 */ 63 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 78 79 struct gfs2_meta_header { 80 __be32 mh_magic; 81 __be32 mh_type; 82 __be64 __pad0; /* Was generation number in gfs1 */ 83 __be32 mh_format; 84 __be32 __pad1; /* Was incarnation number in gfs1 */ 85 }; 86 87 /* 88 * super-block structure 89 * 90 * It's probably good if SIZEOF_SB <= GFS2_BASIC_BLOCK (512 bytes) 91 * 92 * Order is important, need to be able to read old superblocks to do on-disk 93 * version upgrades. 94 */ 95 96 /* Address of superblock in GFS2 basic blocks */ 97 #define GFS2_SB_ADDR 128 98 99 /* The lock number for the superblock (must be zero) */ 100 #define GFS2_SB_LOCK 0 101 102 /* Requirement: GFS2_LOCKNAME_LEN % 8 == 0 103 Includes: the fencing zero at the end */ 104 #define GFS2_LOCKNAME_LEN 64 105 106 struct gfs2_sb { 107 struct gfs2_meta_header sb_header; 108 109 __be32 sb_fs_format; 110 __be32 sb_multihost_format; 111 __u32 __pad0; /* Was superblock flags in gfs1 */ 112 113 __be32 sb_bsize; 114 __be32 sb_bsize_shift; 115 __u32 __pad1; /* Was journal segment size in gfs1 */ 116 117 struct gfs2_inum sb_master_dir; /* Was jindex dinode in gfs1 */ 118 struct gfs2_inum __pad2; /* Was rindex dinode in gfs1 */ 119 struct gfs2_inum sb_root_dir; 120 121 char sb_lockproto[GFS2_LOCKNAME_LEN]; 122 char sb_locktable[GFS2_LOCKNAME_LEN]; 123 124 struct gfs2_inum __pad3; /* Was quota inode in gfs1 */ 125 struct gfs2_inum __pad4; /* Was licence inode in gfs1 */ 126 #define GFS2_HAS_UUID 1 127 __u8 sb_uuid[16]; /* The UUID, maybe 0 for backwards compat */ 128 }; 129 130 /* 131 * resource index structure 132 */ 133 134 struct gfs2_rindex { 135 __be64 ri_addr; /* grp block disk address */ 136 __be32 ri_length; /* length of rgrp header in fs blocks */ 137 __u32 __pad; 138 139 __be64 ri_data0; /* first data location */ 140 __be32 ri_data; /* num of data blocks in rgrp */ 141 142 __be32 ri_bitbytes; /* number of bytes in data bitmaps */ 143 144 __u8 ri_reserved[64]; 145 }; 146 147 /* 148 * resource group header structure 149 */ 150 151 /* Number of blocks per byte in rgrp */ 152 #define GFS2_NBBY 4 153 #define GFS2_BIT_SIZE 2 154 #define GFS2_BIT_MASK 0x00000003 155 156 #define GFS2_BLKST_FREE 0 157 #define GFS2_BLKST_USED 1 158 #define GFS2_BLKST_UNLINKED 2 159 #define GFS2_BLKST_DINODE 3 160 161 #define GFS2_RGF_JOURNAL 0x00000001 162 #define GFS2_RGF_METAONLY 0x00000002 163 #define GFS2_RGF_DATAONLY 0x00000004 164 #define GFS2_RGF_NOALLOC 0x00000008 165 166 struct gfs2_rgrp { 167 struct gfs2_meta_header rg_header; 168 169 __be32 rg_flags; 170 __be32 rg_free; 171 __be32 rg_dinodes; 172 __be32 __pad; 173 __be64 rg_igeneration; 174 175 __u8 rg_reserved[80]; /* Several fields from gfs1 now reserved */ 176 }; 177 178 /* 179 * quota linked list: user quotas and group quotas form two separate 180 * singly linked lists. ll_next stores uids or gids of next quotas in the 181 * linked list. 182 183 Given the uid/gid, how to calculate the quota file offsets for the corresponding 184 gfs2_quota structures on disk: 185 186 for user quotas, given uid, 187 offset = uid * sizeof(struct gfs2_quota); 188 189 for group quotas, given gid, 190 offset = (gid * sizeof(struct gfs2_quota)) + sizeof(struct gfs2_quota); 191 192 193 uid:0 gid:0 uid:12 gid:12 uid:17 gid:17 uid:5142 gid:5142 194 +-------+-------+ +-------+-------+ +-------+- - - -+ +- - - -+-------+ 195 | valid | valid | :: | valid | valid | :: | valid | inval | :: | inval | valid | 196 +-------+-------+ +-------+-------+ +-------+- - - -+ +- - - -+-------+ 197 next:12 next:12 next:17 next:5142 next:NULL next:NULL 198 | | | | |<-- user quota list | 199 \______|___________/ \______|___________/ group quota list -->| 200 | | | 201 \__________________/ \_______________________________________/ 202 203 */ 204 205 /* 206 * quota structure 207 */ 208 209 struct gfs2_quota { 210 __be64 qu_limit; 211 __be64 qu_warn; 212 __be64 qu_value; 213 __be32 qu_ll_next; /* location of next quota in list */ 214 __u8 qu_reserved[60]; 215 }; 216 217 /* 218 * dinode structure 219 */ 220 221 #define GFS2_MAX_META_HEIGHT 10 222 #define GFS2_DIR_MAX_DEPTH 17 223 224 #define DT2IF(dt) (((dt) << 12) & S_IFMT) 225 #define IF2DT(sif) (((sif) & S_IFMT) >> 12) 226 227 enum { 228 gfs2fl_Jdata = 0, 229 gfs2fl_ExHash = 1, 230 gfs2fl_Unused = 2, 231 gfs2fl_EaIndirect = 3, 232 gfs2fl_Directio = 4, 233 gfs2fl_Immutable = 5, 234 gfs2fl_AppendOnly = 6, 235 gfs2fl_NoAtime = 7, 236 gfs2fl_Sync = 8, 237 gfs2fl_System = 9, 238 gfs2fl_TruncInProg = 29, 239 gfs2fl_InheritDirectio = 30, 240 gfs2fl_InheritJdata = 31, 241 }; 242 243 /* Dinode flags */ 244 #define GFS2_DIF_JDATA 0x00000001 245 #define GFS2_DIF_EXHASH 0x00000002 246 #define GFS2_DIF_UNUSED 0x00000004 /* only in gfs1 */ 247 #define GFS2_DIF_EA_INDIRECT 0x00000008 248 #define GFS2_DIF_DIRECTIO 0x00000010 249 #define GFS2_DIF_IMMUTABLE 0x00000020 250 #define GFS2_DIF_APPENDONLY 0x00000040 251 #define GFS2_DIF_NOATIME 0x00000080 252 #define GFS2_DIF_SYNC 0x00000100 253 #define GFS2_DIF_SYSTEM 0x00000200 /* New in gfs2 */ 254 #define GFS2_DIF_TRUNC_IN_PROG 0x20000000 /* New in gfs2 */ 255 #define GFS2_DIF_INHERIT_DIRECTIO 0x40000000 256 #define GFS2_DIF_INHERIT_JDATA 0x80000000 257 258 struct gfs2_dinode { 259 struct gfs2_meta_header di_header; 260 261 struct gfs2_inum di_num; 262 263 __be32 di_mode; /* mode of file */ 264 __be32 di_uid; /* owner's user id */ 265 __be32 di_gid; /* owner's group id */ 266 __be32 di_nlink; /* number of links to this file */ 267 __be64 di_size; /* number of bytes in file */ 268 __be64 di_blocks; /* number of blocks in file */ 269 __be64 di_atime; /* time last accessed */ 270 __be64 di_mtime; /* time last modified */ 271 __be64 di_ctime; /* time last changed */ 272 __be32 di_major; /* device major number */ 273 __be32 di_minor; /* device minor number */ 274 275 /* This section varies from gfs1. Padding added to align with 276 * remainder of dinode 277 */ 278 __be64 di_goal_meta; /* rgrp to alloc from next */ 279 __be64 di_goal_data; /* data block goal */ 280 __be64 di_generation; /* generation number for NFS */ 281 282 __be32 di_flags; /* GFS2_DIF_... */ 283 __be32 di_payload_format; /* GFS2_FORMAT_... */ 284 __u16 __pad1; /* Was ditype in gfs1 */ 285 __be16 di_height; /* height of metadata */ 286 __u32 __pad2; /* Unused incarnation number from gfs1 */ 287 288 /* These only apply to directories */ 289 __u16 __pad3; /* Padding */ 290 __be16 di_depth; /* Number of bits in the table */ 291 __be32 di_entries; /* The number of entries in the directory */ 292 293 struct gfs2_inum __pad4; /* Unused even in current gfs1 */ 294 295 __be64 di_eattr; /* extended attribute block number */ 296 __be32 di_atime_nsec; /* nsec portion of atime */ 297 __be32 di_mtime_nsec; /* nsec portion of mtime */ 298 __be32 di_ctime_nsec; /* nsec portion of ctime */ 299 300 __u8 di_reserved[44]; 301 }; 302 303 /* 304 * directory structure - many of these per directory file 305 */ 306 307 #define GFS2_FNAMESIZE 255 308 #define GFS2_DIRENT_SIZE(name_len) ((sizeof(struct gfs2_dirent) + (name_len) + 7) & ~7) 309 310 struct gfs2_dirent { 311 struct gfs2_inum de_inum; 312 __be32 de_hash; 313 __be16 de_rec_len; 314 __be16 de_name_len; 315 __be16 de_type; 316 __u8 __pad[14]; 317 }; 318 319 /* 320 * Header of leaf directory nodes 321 */ 322 323 struct gfs2_leaf { 324 struct gfs2_meta_header lf_header; 325 326 __be16 lf_depth; /* Depth of leaf */ 327 __be16 lf_entries; /* Number of dirents in leaf */ 328 __be32 lf_dirent_format; /* Format of the dirents */ 329 __be64 lf_next; /* Next leaf, if overflow */ 330 331 __u8 lf_reserved[64]; 332 }; 333 334 /* 335 * Extended attribute header format 336 * 337 * This works in a similar way to dirents. There is a fixed size header 338 * followed by a variable length section made up of the name and the 339 * associated data. In the case of a "stuffed" entry, the value is 340 * __inline__ directly after the name, the ea_num_ptrs entry will be 341 * zero in that case. For non-"stuffed" entries, there will be 342 * a set of pointers (aligned to 8 byte boundary) to the block(s) 343 * containing the value. 344 * 345 * The blocks containing the values and the blocks containing the 346 * extended attribute headers themselves all start with the common 347 * metadata header. Each inode, if it has extended attributes, will 348 * have either a single block containing the extended attribute headers 349 * or a single indirect block pointing to blocks containing the 350 * extended attribure headers. 351 * 352 * The maximim size of the data part of an extended attribute is 64k 353 * so the number of blocks required depends upon block size. Since the 354 * block size also determines the number of pointers in an indirect 355 * block, its a fairly complicated calculation to work out the maximum 356 * number of blocks that an inode may have relating to extended attributes. 357 * 358 */ 359 360 #define GFS2_EA_MAX_NAME_LEN 255 361 #define GFS2_EA_MAX_DATA_LEN 65536 362 363 #define GFS2_EATYPE_UNUSED 0 364 #define GFS2_EATYPE_USR 1 365 #define GFS2_EATYPE_SYS 2 366 #define GFS2_EATYPE_SECURITY 3 367 368 #define GFS2_EATYPE_LAST 3 369 #define GFS2_EATYPE_VALID(x) ((x) <= GFS2_EATYPE_LAST) 370 371 #define GFS2_EAFLAG_LAST 0x01 /* last ea in block */ 372 373 struct gfs2_ea_header { 374 __be32 ea_rec_len; 375 __be32 ea_data_len; 376 __u8 ea_name_len; /* no NULL pointer after the string */ 377 __u8 ea_type; /* GFS2_EATYPE_... */ 378 __u8 ea_flags; /* GFS2_EAFLAG_... */ 379 __u8 ea_num_ptrs; 380 __u32 __pad; 381 }; 382 383 /* 384 * Log header structure 385 */ 386 387 #define GFS2_LOG_HEAD_UNMOUNT 0x00000001 /* log is clean */ 388 389 struct gfs2_log_header { 390 struct gfs2_meta_header lh_header; 391 392 __be64 lh_sequence; /* Sequence number of this transaction */ 393 __be32 lh_flags; /* GFS2_LOG_HEAD_... */ 394 __be32 lh_tail; /* Block number of log tail */ 395 __be32 lh_blkno; 396 __be32 lh_hash; 397 }; 398 399 /* 400 * Log type descriptor 401 */ 402 403 #define GFS2_LOG_DESC_METADATA 300 404 /* ld_data1 is the number of metadata blocks in the descriptor. 405 ld_data2 is unused. */ 406 407 #define GFS2_LOG_DESC_REVOKE 301 408 /* ld_data1 is the number of revoke blocks in the descriptor. 409 ld_data2 is unused. */ 410 411 #define GFS2_LOG_DESC_JDATA 302 412 /* ld_data1 is the number of data blocks in the descriptor. 413 ld_data2 is unused. */ 414 415 struct gfs2_log_descriptor { 416 struct gfs2_meta_header ld_header; 417 418 __be32 ld_type; /* GFS2_LOG_DESC_... */ 419 __be32 ld_length; /* Number of buffers in this chunk */ 420 __be32 ld_data1; /* descriptor-specific field */ 421 __be32 ld_data2; /* descriptor-specific field */ 422 423 __u8 ld_reserved[32]; 424 }; 425 426 /* 427 * Inum Range 428 * Describe a range of formal inode numbers allocated to 429 * one machine to assign to inodes. 430 */ 431 432 #define GFS2_INUM_QUANTUM 1048576 433 434 struct gfs2_inum_range { 435 __be64 ir_start; 436 __be64 ir_length; 437 }; 438 439 /* 440 * Statfs change 441 * Describes an change to the pool of free and allocated 442 * blocks. 443 */ 444 445 struct gfs2_statfs_change { 446 __be64 sc_total; 447 __be64 sc_free; 448 __be64 sc_dinodes; 449 }; 450 451 /* 452 * Quota change 453 * Describes an allocation change for a particular 454 * user or group. 455 */ 456 457 #define GFS2_QCF_USER 0x00000001 458 459 struct gfs2_quota_change { 460 __be64 qc_change; 461 __be32 qc_flags; /* GFS2_QCF_... */ 462 __be32 qc_id; 463 }; 464 465 struct gfs2_quota_lvb { 466 __be32 qb_magic; 467 __u32 __pad; 468 __be64 qb_limit; /* Hard limit of # blocks to alloc */ 469 __be64 qb_warn; /* Warn user when alloc is above this # */ 470 __be64 qb_value; /* Current # blocks allocated */ 471 }; 472 473 #endif /* __GFS2_ONDISK_DOT_H__ */ 474
