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 /* This union is to keep userspace happy */ 85 union { 86 __be32 mh_jid; /* Was incarnation number in gfs1 */ 87 __be32 __pad1; 88 }; 89 }; 90 91 /* 92 * super-block structure 93 * 94 * It's probably good if SIZEOF_SB <= GFS2_BASIC_BLOCK (512 bytes) 95 * 96 * Order is important, need to be able to read old superblocks to do on-disk 97 * version upgrades. 98 */ 99 100 /* Address of superblock in GFS2 basic blocks */ 101 #define GFS2_SB_ADDR 128 102 103 /* The lock number for the superblock (must be zero) */ 104 #define GFS2_SB_LOCK 0 105 106 /* Requirement: GFS2_LOCKNAME_LEN % 8 == 0 107 Includes: the fencing zero at the end */ 108 #define GFS2_LOCKNAME_LEN 64 109 110 struct gfs2_sb { 111 struct gfs2_meta_header sb_header; 112 113 __be32 sb_fs_format; 114 __be32 sb_multihost_format; 115 __u32 __pad0; /* Was superblock flags in gfs1 */ 116 117 __be32 sb_bsize; 118 __be32 sb_bsize_shift; 119 __u32 __pad1; /* Was journal segment size in gfs1 */ 120 121 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; 124 125 char sb_lockproto[GFS2_LOCKNAME_LEN]; 126 char sb_locktable[GFS2_LOCKNAME_LEN]; 127 128 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 */ 132 }; 133 134 /* 135 * resource index structure 136 */ 137 138 struct gfs2_rindex { 139 __be64 ri_addr; /* grp block disk address */ 140 __be32 ri_length; /* length of rgrp header in fs blocks */ 141 __u32 __pad; 142 143 __be64 ri_data0; /* first data location */ 144 __be32 ri_data; /* num of data blocks in rgrp */ 145 146 __be32 ri_bitbytes; /* number of bytes in data bitmaps */ 147 148 __u8 ri_reserved[64]; 149 }; 150 151 /* 152 * resource group header structure 153 */ 154 155 /* Number of blocks per byte in rgrp */ 156 #define GFS2_NBBY 4 157 #define GFS2_BIT_SIZE 2 158 #define GFS2_BIT_MASK 0x00000003 159 160 #define GFS2_BLKST_FREE 0 161 #define GFS2_BLKST_USED 1 162 #define GFS2_BLKST_UNLINKED 2 163 #define GFS2_BLKST_DINODE 3 164 165 #define GFS2_RGF_JOURNAL 0x00000001 166 #define GFS2_RGF_METAONLY 0x00000002 167 #define GFS2_RGF_DATAONLY 0x00000004 168 #define GFS2_RGF_NOALLOC 0x00000008 169 170 struct gfs2_rgrp { 171 struct gfs2_meta_header rg_header; 172 173 __be32 rg_flags; 174 __be32 rg_free; 175 __be32 rg_dinodes; 176 __be32 __pad; 177 __be64 rg_igeneration; 178 179 __u8 rg_reserved[80]; /* Several fields from gfs1 now reserved */ 180 }; 181 182 /* 183 * quota structure 184 */ 185 186 struct gfs2_quota { 187 __be64 qu_limit; 188 __be64 qu_warn; 189 __be64 qu_value; 190 __u8 qu_reserved[64]; 191 }; 192 193 /* 194 * dinode structure 195 */ 196 197 #define GFS2_MAX_META_HEIGHT 10 198 #define GFS2_DIR_MAX_DEPTH 17 199 200 #define DT2IF(dt) (((dt) << 12) & S_IFMT) 201 #define IF2DT(sif) (((sif) & S_IFMT) >> 12) 202 203 enum { 204 gfs2fl_Jdata = 0, 205 gfs2fl_ExHash = 1, 206 gfs2fl_Unused = 2, 207 gfs2fl_EaIndirect = 3, 208 gfs2fl_Directio = 4, 209 gfs2fl_Immutable = 5, 210 gfs2fl_AppendOnly = 6, 211 gfs2fl_NoAtime = 7, 212 gfs2fl_Sync = 8, 213 gfs2fl_System = 9, 214 gfs2fl_TruncInProg = 29, 215 gfs2fl_InheritDirectio = 30, 216 gfs2fl_InheritJdata = 31, 217 }; 218 219 /* Dinode flags */ 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 233 234 struct gfs2_dinode { 235 struct gfs2_meta_header di_header; 236 237 struct gfs2_inum di_num; 238 239 __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 */ 250 251 /* This section varies from gfs1. Padding added to align with 252 * remainder of dinode 253 */ 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 */ 257 258 __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 */ 263 264 /* 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 */ 268 269 struct gfs2_inum __pad4; /* Unused even in current gfs1 */ 270 271 __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 */ 275 276 __u8 di_reserved[44]; 277 }; 278 279 /* 280 * directory structure - many of these per directory file 281 */ 282 283 #define GFS2_FNAMESIZE 255 284 #define GFS2_DIRENT_SIZE(name_len) ((sizeof(struct gfs2_dirent) + (name_len) + 7) & ~7) 285 286 struct gfs2_dirent { 287 struct gfs2_inum de_inum; 288 __be32 de_hash; 289 __be16 de_rec_len; 290 __be16 de_name_len; 291 __be16 de_type; 292 __u8 __pad[14]; 293 }; 294 295 /* 296 * Header of leaf directory nodes 297 */ 298 299 struct gfs2_leaf { 300 struct gfs2_meta_header lf_header; 301 302 __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 */ 306 307 __u8 lf_reserved[64]; 308 }; 309 310 /* 311 * Extended attribute header format 312 * 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. 320 * 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. 327 * 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. 333 * 334 */ 335 336 #define GFS2_EA_MAX_NAME_LEN 255 337 #define GFS2_EA_MAX_DATA_LEN 65536 338 339 #define GFS2_EATYPE_UNUSED 0 340 #define GFS2_EATYPE_USR 1 341 #define GFS2_EATYPE_SYS 2 342 #define GFS2_EATYPE_SECURITY 3 343 344 #define GFS2_EATYPE_LAST 3 345 #define GFS2_EATYPE_VALID(x) ((x) <= GFS2_EATYPE_LAST) 346 347 #define GFS2_EAFLAG_LAST 0x01 /* last ea in block */ 348 349 struct gfs2_ea_header { 350 __be32 ea_rec_len; 351 __be32 ea_data_len; 352 __u8 ea_name_len; /* no NULL pointer after the string */ 353 __u8 ea_type; /* GFS2_EATYPE_... */ 354 __u8 ea_flags; /* GFS2_EAFLAG_... */ 355 __u8 ea_num_ptrs; 356 __u32 __pad; 357 }; 358 359 /* 360 * Log header structure 361 */ 362 363 #define GFS2_LOG_HEAD_UNMOUNT 0x00000001 /* log is clean */ 364 365 struct gfs2_log_header { 366 struct gfs2_meta_header lh_header; 367 368 __be64 lh_sequence; /* Sequence number of this transaction */ 369 __be32 lh_flags; /* GFS2_LOG_HEAD_... */ 370 __be32 lh_tail; /* Block number of log tail */ 371 __be32 lh_blkno; 372 __be32 lh_hash; 373 }; 374 375 /* 376 * Log type descriptor 377 */ 378 379 #define GFS2_LOG_DESC_METADATA 300 380 /* ld_data1 is the number of metadata blocks in the descriptor. 381 ld_data2 is unused. */ 382 383 #define GFS2_LOG_DESC_REVOKE 301 384 /* ld_data1 is the number of revoke blocks in the descriptor. 385 ld_data2 is unused. */ 386 387 #define GFS2_LOG_DESC_JDATA 302 388 /* ld_data1 is the number of data blocks in the descriptor. 389 ld_data2 is unused. */ 390 391 struct gfs2_log_descriptor { 392 struct gfs2_meta_header ld_header; 393 394 __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 */ 398 399 __u8 ld_reserved[32]; 400 }; 401 402 /* 403 * Inum Range 404 * Describe a range of formal inode numbers allocated to 405 * one machine to assign to inodes. 406 */ 407 408 #define GFS2_INUM_QUANTUM 1048576 409 410 struct gfs2_inum_range { 411 __be64 ir_start; 412 __be64 ir_length; 413 }; 414 415 /* 416 * Statfs change 417 * Describes an change to the pool of free and allocated 418 * blocks. 419 */ 420 421 struct gfs2_statfs_change { 422 __be64 sc_total; 423 __be64 sc_free; 424 __be64 sc_dinodes; 425 }; 426 427 /* 428 * Quota change 429 * Describes an allocation change for a particular 430 * user or group. 431 */ 432 433 #define GFS2_QCF_USER 0x00000001 434 435 struct gfs2_quota_change { 436 __be64 qc_change; 437 __be32 qc_flags; /* GFS2_QCF_... */ 438 __be32 qc_id; 439 }; 440 441 struct gfs2_quota_lvb { 442 __be32 qb_magic; 443 __u32 __pad; 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 */ 447 }; 448 449 #endif /* __GFS2_ONDISK_DOT_H__ */ 450
