1 /* -*- mode: c; c-basic-offset: 8; -*- 2 * vim: noexpandtab sw=8 ts=8 sts=0: 3 * 4 * ocfs2_fs.h 5 * 6 * On-disk structures for OCFS2. 7 * 8 * Copyright (C) 2002, 2004 Oracle. All rights reserved. 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public 12 * License, version 2, as published by the Free Software Foundation. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17 * General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public 20 * License along with this program; if not, write to the 21 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 22 * Boston, MA 021110-1307, USA. 23 */ 24 25 #ifndef _OCFS2_FS_H 26 #define _OCFS2_FS_H 27 28 /* Version */ 29 #define OCFS2_MAJOR_REV_LEVEL 0 30 #define OCFS2_MINOR_REV_LEVEL 90 31 32 /* 33 * An OCFS2 volume starts this way: 34 * Sector 0: Valid ocfs1_vol_disk_hdr that cleanly fails to mount OCFS. 35 * Sector 1: Valid ocfs1_vol_label that cleanly fails to mount OCFS. 36 * Block OCFS2_SUPER_BLOCK_BLKNO: OCFS2 superblock. 37 * 38 * All other structures are found from the superblock information. 39 * 40 * OCFS2_SUPER_BLOCK_BLKNO is in blocks, not sectors. eg, for a 41 * blocksize of 2K, it is 4096 bytes into disk. 42 */ 43 #define OCFS2_SUPER_BLOCK_BLKNO 2 44 45 /* 46 * Cluster size limits. The maximum is kept arbitrarily at 1 MB, and could 47 * grow if needed. 48 */ 49 #define OCFS2_MIN_CLUSTERSIZE 4096 50 #define OCFS2_MAX_CLUSTERSIZE 1048576 51 52 /* 53 * Blocks cannot be bigger than clusters, so the maximum blocksize is the 54 * minimum cluster size. 55 */ 56 #define OCFS2_MIN_BLOCKSIZE 512 57 #define OCFS2_MAX_BLOCKSIZE OCFS2_MIN_CLUSTERSIZE 58 59 /* Filesystem magic number */ 60 #define OCFS2_SUPER_MAGIC 0x7461636f 61 62 /* Object signatures */ 63 #define OCFS2_SUPER_BLOCK_SIGNATURE "OCFSV2" 64 #define OCFS2_INODE_SIGNATURE "INODE01" 65 #define OCFS2_EXTENT_BLOCK_SIGNATURE "EXBLK01" 66 #define OCFS2_GROUP_DESC_SIGNATURE "GROUP01" 67 #define OCFS2_XATTR_BLOCK_SIGNATURE "XATTR01" 68 #define OCFS2_DIR_TRAILER_SIGNATURE "DIRTRL1" 69 #define OCFS2_DX_ROOT_SIGNATURE "DXDIR01" 70 #define OCFS2_DX_LEAF_SIGNATURE "DXLEAF1" 71 #define OCFS2_REFCOUNT_BLOCK_SIGNATURE "REFCNT1" 72 73 /* Compatibility flags */ 74 #define OCFS2_HAS_COMPAT_FEATURE(sb,mask) \ 75 ( OCFS2_SB(sb)->s_feature_compat & (mask) ) 76 #define OCFS2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 77 ( OCFS2_SB(sb)->s_feature_ro_compat & (mask) ) 78 #define OCFS2_HAS_INCOMPAT_FEATURE(sb,mask) \ 79 ( OCFS2_SB(sb)->s_feature_incompat & (mask) ) 80 #define OCFS2_SET_COMPAT_FEATURE(sb,mask) \ 81 OCFS2_SB(sb)->s_feature_compat |= (mask) 82 #define OCFS2_SET_RO_COMPAT_FEATURE(sb,mask) \ 83 OCFS2_SB(sb)->s_feature_ro_compat |= (mask) 84 #define OCFS2_SET_INCOMPAT_FEATURE(sb,mask) \ 85 OCFS2_SB(sb)->s_feature_incompat |= (mask) 86 #define OCFS2_CLEAR_COMPAT_FEATURE(sb,mask) \ 87 OCFS2_SB(sb)->s_feature_compat &= ~(mask) 88 #define OCFS2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 89 OCFS2_SB(sb)->s_feature_ro_compat &= ~(mask) 90 #define OCFS2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 91 OCFS2_SB(sb)->s_feature_incompat &= ~(mask) 92 93 #define OCFS2_FEATURE_COMPAT_SUPP (OCFS2_FEATURE_COMPAT_BACKUP_SB \ 94 | OCFS2_FEATURE_COMPAT_JBD2_SB) 95 #define OCFS2_FEATURE_INCOMPAT_SUPP (OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT \ 96 | OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC \ 97 | OCFS2_FEATURE_INCOMPAT_INLINE_DATA \ 98 | OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP \ 99 | OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK \ 100 | OCFS2_FEATURE_INCOMPAT_XATTR \ 101 | OCFS2_FEATURE_INCOMPAT_META_ECC \ 102 | OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS \ 103 | OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE \ 104 | OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG) 105 #define OCFS2_FEATURE_RO_COMPAT_SUPP (OCFS2_FEATURE_RO_COMPAT_UNWRITTEN \ 106 | OCFS2_FEATURE_RO_COMPAT_USRQUOTA \ 107 | OCFS2_FEATURE_RO_COMPAT_GRPQUOTA) 108 109 /* 110 * Heartbeat-only devices are missing journals and other files. The 111 * filesystem driver can't load them, but the library can. Never put 112 * this in OCFS2_FEATURE_INCOMPAT_SUPP, *ever*. 113 */ 114 #define OCFS2_FEATURE_INCOMPAT_HEARTBEAT_DEV 0x0002 115 116 /* 117 * tunefs sets this incompat flag before starting the resize and clears it 118 * at the end. This flag protects users from inadvertently mounting the fs 119 * after an aborted run without fsck-ing. 120 */ 121 #define OCFS2_FEATURE_INCOMPAT_RESIZE_INPROG 0x0004 122 123 /* Used to denote a non-clustered volume */ 124 #define OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT 0x0008 125 126 /* Support for sparse allocation in b-trees */ 127 #define OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC 0x0010 128 129 /* 130 * Tunefs sets this incompat flag before starting an operation which 131 * would require cleanup on abort. This is done to protect users from 132 * inadvertently mounting the fs after an aborted run without 133 * fsck-ing. 134 * 135 * s_tunefs_flags on the super block describes precisely which 136 * operations were in progress. 137 */ 138 #define OCFS2_FEATURE_INCOMPAT_TUNEFS_INPROG 0x0020 139 140 /* Support for data packed into inode blocks */ 141 #define OCFS2_FEATURE_INCOMPAT_INLINE_DATA 0x0040 142 143 /* 144 * Support for alternate, userspace cluster stacks. If set, the superblock 145 * field s_cluster_info contains a tag for the alternate stack in use as 146 * well as the name of the cluster being joined. 147 * mount.ocfs2 must pass in a matching stack name. 148 * 149 * If not set, the classic stack will be used. This is compatbile with 150 * all older versions. 151 */ 152 #define OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK 0x0080 153 154 /* Support for the extended slot map */ 155 #define OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP 0x100 156 157 /* Support for extended attributes */ 158 #define OCFS2_FEATURE_INCOMPAT_XATTR 0x0200 159 160 /* Support for indexed directores */ 161 #define OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS 0x0400 162 163 /* Metadata checksum and error correction */ 164 #define OCFS2_FEATURE_INCOMPAT_META_ECC 0x0800 165 166 /* Refcount tree support */ 167 #define OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE 0x1000 168 169 /* Discontigous block groups */ 170 #define OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG 0x2000 171 172 /* 173 * backup superblock flag is used to indicate that this volume 174 * has backup superblocks. 175 */ 176 #define OCFS2_FEATURE_COMPAT_BACKUP_SB 0x0001 177 178 /* 179 * The filesystem will correctly handle journal feature bits. 180 */ 181 #define OCFS2_FEATURE_COMPAT_JBD2_SB 0x0002 182 183 /* 184 * Unwritten extents support. 185 */ 186 #define OCFS2_FEATURE_RO_COMPAT_UNWRITTEN 0x0001 187 188 /* 189 * Maintain quota information for this filesystem 190 */ 191 #define OCFS2_FEATURE_RO_COMPAT_USRQUOTA 0x0002 192 #define OCFS2_FEATURE_RO_COMPAT_GRPQUOTA 0x0004 193 194 /* The byte offset of the first backup block will be 1G. 195 * The following will be 4G, 16G, 64G, 256G and 1T. 196 */ 197 #define OCFS2_BACKUP_SB_START 1 << 30 198 199 /* the max backup superblock nums */ 200 #define OCFS2_MAX_BACKUP_SUPERBLOCKS 6 201 202 /* 203 * Flags on ocfs2_super_block.s_tunefs_flags 204 */ 205 #define OCFS2_TUNEFS_INPROG_REMOVE_SLOT 0x0001 /* Removing slots */ 206 207 /* 208 * Flags on ocfs2_dinode.i_flags 209 */ 210 #define OCFS2_VALID_FL (0x00000001) /* Inode is valid */ 211 #define OCFS2_UNUSED2_FL (0x00000002) 212 #define OCFS2_ORPHANED_FL (0x00000004) /* On the orphan list */ 213 #define OCFS2_UNUSED3_FL (0x00000008) 214 /* System inode flags */ 215 #define OCFS2_SYSTEM_FL (0x00000010) /* System inode */ 216 #define OCFS2_SUPER_BLOCK_FL (0x00000020) /* Super block */ 217 #define OCFS2_LOCAL_ALLOC_FL (0x00000040) /* Slot local alloc bitmap */ 218 #define OCFS2_BITMAP_FL (0x00000080) /* Allocation bitmap */ 219 #define OCFS2_JOURNAL_FL (0x00000100) /* Slot local journal */ 220 #define OCFS2_HEARTBEAT_FL (0x00000200) /* Heartbeat area */ 221 #define OCFS2_CHAIN_FL (0x00000400) /* Chain allocator */ 222 #define OCFS2_DEALLOC_FL (0x00000800) /* Truncate log */ 223 #define OCFS2_QUOTA_FL (0x00001000) /* Quota file */ 224 225 /* 226 * Flags on ocfs2_dinode.i_dyn_features 227 * 228 * These can change much more often than i_flags. When adding flags, 229 * keep in mind that i_dyn_features is only 16 bits wide. 230 */ 231 #define OCFS2_INLINE_DATA_FL (0x0001) /* Data stored in inode block */ 232 #define OCFS2_HAS_XATTR_FL (0x0002) 233 #define OCFS2_INLINE_XATTR_FL (0x0004) 234 #define OCFS2_INDEXED_DIR_FL (0x0008) 235 #define OCFS2_HAS_REFCOUNT_FL (0x0010) 236 237 /* Inode attributes, keep in sync with EXT2 */ 238 #define OCFS2_SECRM_FL (0x00000001) /* Secure deletion */ 239 #define OCFS2_UNRM_FL (0x00000002) /* Undelete */ 240 #define OCFS2_COMPR_FL (0x00000004) /* Compress file */ 241 #define OCFS2_SYNC_FL (0x00000008) /* Synchronous updates */ 242 #define OCFS2_IMMUTABLE_FL (0x00000010) /* Immutable file */ 243 #define OCFS2_APPEND_FL (0x00000020) /* writes to file may only append */ 244 #define OCFS2_NODUMP_FL (0x00000040) /* do not dump file */ 245 #define OCFS2_NOATIME_FL (0x00000080) /* do not update atime */ 246 #define OCFS2_DIRSYNC_FL (0x00010000) /* dirsync behaviour (directories only) */ 247 248 #define OCFS2_FL_VISIBLE (0x000100FF) /* User visible flags */ 249 #define OCFS2_FL_MODIFIABLE (0x000100FF) /* User modifiable flags */ 250 251 /* 252 * Extent record flags (e_node.leaf.flags) 253 */ 254 #define OCFS2_EXT_UNWRITTEN (0x01) /* Extent is allocated but 255 * unwritten */ 256 #define OCFS2_EXT_REFCOUNTED (0x02) /* Extent is reference 257 * counted in an associated 258 * refcount tree */ 259 260 /* 261 * Journal Flags (ocfs2_dinode.id1.journal1.i_flags) 262 */ 263 #define OCFS2_JOURNAL_DIRTY_FL (0x00000001) /* Journal needs recovery */ 264 265 /* 266 * superblock s_state flags 267 */ 268 #define OCFS2_ERROR_FS (0x00000001) /* FS saw errors */ 269 270 /* Limit of space in ocfs2_dir_entry */ 271 #define OCFS2_MAX_FILENAME_LEN 255 272 273 /* Maximum slots on an ocfs2 file system */ 274 #define OCFS2_MAX_SLOTS 255 275 276 /* Slot map indicator for an empty slot */ 277 #define OCFS2_INVALID_SLOT -1 278 279 #define OCFS2_VOL_UUID_LEN 16 280 #define OCFS2_MAX_VOL_LABEL_LEN 64 281 282 /* The alternate, userspace stack fields */ 283 #define OCFS2_STACK_LABEL_LEN 4 284 #define OCFS2_CLUSTER_NAME_LEN 16 285 286 /* Journal limits (in bytes) */ 287 #define OCFS2_MIN_JOURNAL_SIZE (4 * 1024 * 1024) 288 289 /* 290 * Inline extended attribute size (in bytes) 291 * The value chosen should be aligned to 16 byte boundaries. 292 */ 293 #define OCFS2_MIN_XATTR_INLINE_SIZE 256 294 295 struct ocfs2_system_inode_info { 296 char *si_name; 297 int si_iflags; 298 int si_mode; 299 }; 300 301 /* System file index */ 302 enum { 303 BAD_BLOCK_SYSTEM_INODE = 0, 304 GLOBAL_INODE_ALLOC_SYSTEM_INODE, 305 SLOT_MAP_SYSTEM_INODE, 306 #define OCFS2_FIRST_ONLINE_SYSTEM_INODE SLOT_MAP_SYSTEM_INODE 307 HEARTBEAT_SYSTEM_INODE, 308 GLOBAL_BITMAP_SYSTEM_INODE, 309 USER_QUOTA_SYSTEM_INODE, 310 GROUP_QUOTA_SYSTEM_INODE, 311 #define OCFS2_LAST_GLOBAL_SYSTEM_INODE GROUP_QUOTA_SYSTEM_INODE 312 ORPHAN_DIR_SYSTEM_INODE, 313 EXTENT_ALLOC_SYSTEM_INODE, 314 INODE_ALLOC_SYSTEM_INODE, 315 JOURNAL_SYSTEM_INODE, 316 LOCAL_ALLOC_SYSTEM_INODE, 317 TRUNCATE_LOG_SYSTEM_INODE, 318 LOCAL_USER_QUOTA_SYSTEM_INODE, 319 LOCAL_GROUP_QUOTA_SYSTEM_INODE, 320 NUM_SYSTEM_INODES 321 }; 322 323 static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = { 324 /* Global system inodes (single copy) */ 325 /* The first two are only used from userspace mfks/tunefs */ 326 [BAD_BLOCK_SYSTEM_INODE] = { "bad_blocks", 0, S_IFREG | 0644 }, 327 [GLOBAL_INODE_ALLOC_SYSTEM_INODE] = { "global_inode_alloc", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, 328 329 /* These are used by the running filesystem */ 330 [SLOT_MAP_SYSTEM_INODE] = { "slot_map", 0, S_IFREG | 0644 }, 331 [HEARTBEAT_SYSTEM_INODE] = { "heartbeat", OCFS2_HEARTBEAT_FL, S_IFREG | 0644 }, 332 [GLOBAL_BITMAP_SYSTEM_INODE] = { "global_bitmap", 0, S_IFREG | 0644 }, 333 [USER_QUOTA_SYSTEM_INODE] = { "aquota.user", OCFS2_QUOTA_FL, S_IFREG | 0644 }, 334 [GROUP_QUOTA_SYSTEM_INODE] = { "aquota.group", OCFS2_QUOTA_FL, S_IFREG | 0644 }, 335 336 /* Slot-specific system inodes (one copy per slot) */ 337 [ORPHAN_DIR_SYSTEM_INODE] = { "orphan_dir:%04d", 0, S_IFDIR | 0755 }, 338 [EXTENT_ALLOC_SYSTEM_INODE] = { "extent_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, 339 [INODE_ALLOC_SYSTEM_INODE] = { "inode_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, 340 [JOURNAL_SYSTEM_INODE] = { "journal:%04d", OCFS2_JOURNAL_FL, S_IFREG | 0644 }, 341 [LOCAL_ALLOC_SYSTEM_INODE] = { "local_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_LOCAL_ALLOC_FL, S_IFREG | 0644 }, 342 [TRUNCATE_LOG_SYSTEM_INODE] = { "truncate_log:%04d", OCFS2_DEALLOC_FL, S_IFREG | 0644 }, 343 [LOCAL_USER_QUOTA_SYSTEM_INODE] = { "aquota.user:%04d", OCFS2_QUOTA_FL, S_IFREG | 0644 }, 344 [LOCAL_GROUP_QUOTA_SYSTEM_INODE] = { "aquota.group:%04d", OCFS2_QUOTA_FL, S_IFREG | 0644 }, 345 }; 346 347 /* Parameter passed from mount.ocfs2 to module */ 348 #define OCFS2_HB_NONE "heartbeat=none" 349 #define OCFS2_HB_LOCAL "heartbeat=local" 350 351 /* 352 * OCFS2 directory file types. Only the low 3 bits are used. The 353 * other bits are reserved for now. 354 */ 355 #define OCFS2_FT_UNKNOWN 0 356 #define OCFS2_FT_REG_FILE 1 357 #define OCFS2_FT_DIR 2 358 #define OCFS2_FT_CHRDEV 3 359 #define OCFS2_FT_BLKDEV 4 360 #define OCFS2_FT_FIFO 5 361 #define OCFS2_FT_SOCK 6 362 #define OCFS2_FT_SYMLINK 7 363 364 #define OCFS2_FT_MAX 8 365 366 /* 367 * OCFS2_DIR_PAD defines the directory entries boundaries 368 * 369 * NOTE: It must be a multiple of 4 370 */ 371 #define OCFS2_DIR_PAD 4 372 #define OCFS2_DIR_ROUND (OCFS2_DIR_PAD - 1) 373 #define OCFS2_DIR_MEMBER_LEN offsetof(struct ocfs2_dir_entry, name) 374 #define OCFS2_DIR_REC_LEN(name_len) (((name_len) + OCFS2_DIR_MEMBER_LEN + \ 375 OCFS2_DIR_ROUND) & \ 376 ~OCFS2_DIR_ROUND) 377 #define OCFS2_DIR_MIN_REC_LEN OCFS2_DIR_REC_LEN(1) 378 379 #define OCFS2_LINK_MAX 32000 380 #define OCFS2_DX_LINK_MAX ((1U << 31) - 1U) 381 #define OCFS2_LINKS_HI_SHIFT 16 382 #define OCFS2_DX_ENTRIES_MAX (0xffffffffU) 383 384 #define S_SHIFT 12 385 static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = { 386 [S_IFREG >> S_SHIFT] = OCFS2_FT_REG_FILE, 387 [S_IFDIR >> S_SHIFT] = OCFS2_FT_DIR, 388 [S_IFCHR >> S_SHIFT] = OCFS2_FT_CHRDEV, 389 [S_IFBLK >> S_SHIFT] = OCFS2_FT_BLKDEV, 390 [S_IFIFO >> S_SHIFT] = OCFS2_FT_FIFO, 391 [S_IFSOCK >> S_SHIFT] = OCFS2_FT_SOCK, 392 [S_IFLNK >> S_SHIFT] = OCFS2_FT_SYMLINK, 393 }; 394 395 396 /* 397 * Convenience casts 398 */ 399 #define OCFS2_RAW_SB(dinode) (&((dinode)->id2.i_super)) 400 401 /* 402 * Block checking structure. This is used in metadata to validate the 403 * contents. If OCFS2_FEATURE_INCOMPAT_META_ECC is not set, it is all 404 * zeros. 405 */ 406 struct ocfs2_block_check { 407 /*00*/ __le32 bc_crc32e; /* 802.3 Ethernet II CRC32 */ 408 __le16 bc_ecc; /* Single-error-correction parity vector. 409 This is a simple Hamming code dependant 410 on the blocksize. OCFS2's maximum 411 blocksize, 4K, requires 16 parity bits, 412 so we fit in __le16. */ 413 __le16 bc_reserved1; 414 /*08*/ 415 }; 416 417 /* 418 * On disk extent record for OCFS2 419 * It describes a range of clusters on disk. 420 * 421 * Length fields are divided into interior and leaf node versions. 422 * This leaves room for a flags field (OCFS2_EXT_*) in the leaf nodes. 423 */ 424 struct ocfs2_extent_rec { 425 /*00*/ __le32 e_cpos; /* Offset into the file, in clusters */ 426 union { 427 __le32 e_int_clusters; /* Clusters covered by all children */ 428 struct { 429 __le16 e_leaf_clusters; /* Clusters covered by this 430 extent */ 431 __u8 e_reserved1; 432 __u8 e_flags; /* Extent flags */ 433 }; 434 }; 435 __le64 e_blkno; /* Physical disk offset, in blocks */ 436 /*10*/ 437 }; 438 439 struct ocfs2_chain_rec { 440 __le32 c_free; /* Number of free bits in this chain. */ 441 __le32 c_total; /* Number of total bits in this chain */ 442 __le64 c_blkno; /* Physical disk offset (blocks) of 1st group */ 443 }; 444 445 struct ocfs2_truncate_rec { 446 __le32 t_start; /* 1st cluster in this log */ 447 __le32 t_clusters; /* Number of total clusters covered */ 448 }; 449 450 /* 451 * On disk extent list for OCFS2 (node in the tree). Note that this 452 * is contained inside ocfs2_dinode or ocfs2_extent_block, so the 453 * offsets are relative to ocfs2_dinode.id2.i_list or 454 * ocfs2_extent_block.h_list, respectively. 455 */ 456 struct ocfs2_extent_list { 457 /*00*/ __le16 l_tree_depth; /* Extent tree depth from this 458 point. 0 means data extents 459 hang directly off this 460 header (a leaf) 461 NOTE: The high 8 bits cannot be 462 used - tree_depth is never that big. 463 */ 464 __le16 l_count; /* Number of extent records */ 465 __le16 l_next_free_rec; /* Next unused extent slot */ 466 __le16 l_reserved1; 467 __le64 l_reserved2; /* Pad to 468 sizeof(ocfs2_extent_rec) */ 469 /*10*/ struct ocfs2_extent_rec l_recs[0]; /* Extent records */ 470 }; 471 472 /* 473 * On disk allocation chain list for OCFS2. Note that this is 474 * contained inside ocfs2_dinode, so the offsets are relative to 475 * ocfs2_dinode.id2.i_chain. 476 */ 477 struct ocfs2_chain_list { 478 /*00*/ __le16 cl_cpg; /* Clusters per Block Group */ 479 __le16 cl_bpc; /* Bits per cluster */ 480 __le16 cl_count; /* Total chains in this list */ 481 __le16 cl_next_free_rec; /* Next unused chain slot */ 482 __le64 cl_reserved1; 483 /*10*/ struct ocfs2_chain_rec cl_recs[0]; /* Chain records */ 484 }; 485 486 /* 487 * On disk deallocation log for OCFS2. Note that this is 488 * contained inside ocfs2_dinode, so the offsets are relative to 489 * ocfs2_dinode.id2.i_dealloc. 490 */ 491 struct ocfs2_truncate_log { 492 /*00*/ __le16 tl_count; /* Total records in this log */ 493 __le16 tl_used; /* Number of records in use */ 494 __le32 tl_reserved1; 495 /*08*/ struct ocfs2_truncate_rec tl_recs[0]; /* Truncate records */ 496 }; 497 498 /* 499 * On disk extent block (indirect block) for OCFS2 500 */ 501 struct ocfs2_extent_block 502 { 503 /*00*/ __u8 h_signature[8]; /* Signature for verification */ 504 struct ocfs2_block_check h_check; /* Error checking */ 505 /*10*/ __le16 h_suballoc_slot; /* Slot suballocator this 506 extent_header belongs to */ 507 __le16 h_suballoc_bit; /* Bit offset in suballocator 508 block group */ 509 __le32 h_fs_generation; /* Must match super block */ 510 __le64 h_blkno; /* Offset on disk, in blocks */ 511 /*20*/ __le64 h_suballoc_loc; /* Suballocator block group this 512 eb belongs to. Only valid 513 if allocated from a 514 discontiguous block group */ 515 __le64 h_next_leaf_blk; /* Offset on disk, in blocks, 516 of next leaf header pointing 517 to data */ 518 /*30*/ struct ocfs2_extent_list h_list; /* Extent record list */ 519 /* Actual on-disk size is one block */ 520 }; 521 522 /* 523 * On disk slot map for OCFS2. This defines the contents of the "slot_map" 524 * system file. A slot is valid if it contains a node number >= 0. The 525 * value -1 (0xFFFF) is OCFS2_INVALID_SLOT. This marks a slot empty. 526 */ 527 struct ocfs2_slot_map { 528 /*00*/ __le16 sm_slots[0]; 529 /* 530 * Actual on-disk size is one block. OCFS2_MAX_SLOTS is 255, 531 * 255 * sizeof(__le16) == 512B, within the 512B block minimum blocksize. 532 */ 533 }; 534 535 struct ocfs2_extended_slot { 536 /*00*/ __u8 es_valid; 537 __u8 es_reserved1[3]; 538 __le32 es_node_num; 539 /*10*/ 540 }; 541 542 /* 543 * The extended slot map, used when OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP 544 * is set. It separates out the valid marker from the node number, and 545 * has room to grow. Unlike the old slot map, this format is defined by 546 * i_size. 547 */ 548 struct ocfs2_slot_map_extended { 549 /*00*/ struct ocfs2_extended_slot se_slots[0]; 550 /* 551 * Actual size is i_size of the slot_map system file. It should 552 * match s_max_slots * sizeof(struct ocfs2_extended_slot) 553 */ 554 }; 555 556 struct ocfs2_cluster_info { 557 /*00*/ __u8 ci_stack[OCFS2_STACK_LABEL_LEN]; 558 __le32 ci_reserved; 559 /*08*/ __u8 ci_cluster[OCFS2_CLUSTER_NAME_LEN]; 560 /*18*/ 561 }; 562 563 /* 564 * On disk superblock for OCFS2 565 * Note that it is contained inside an ocfs2_dinode, so all offsets 566 * are relative to the start of ocfs2_dinode.id2. 567 */ 568 struct ocfs2_super_block { 569 /*00*/ __le16 s_major_rev_level; 570 __le16 s_minor_rev_level; 571 __le16 s_mnt_count; 572 __le16 s_max_mnt_count; 573 __le16 s_state; /* File system state */ 574 __le16 s_errors; /* Behaviour when detecting errors */ 575 __le32 s_checkinterval; /* Max time between checks */ 576 /*10*/ __le64 s_lastcheck; /* Time of last check */ 577 __le32 s_creator_os; /* OS */ 578 __le32 s_feature_compat; /* Compatible feature set */ 579 /*20*/ __le32 s_feature_incompat; /* Incompatible feature set */ 580 __le32 s_feature_ro_compat; /* Readonly-compatible feature set */ 581 __le64 s_root_blkno; /* Offset, in blocks, of root directory 582 dinode */ 583 /*30*/ __le64 s_system_dir_blkno; /* Offset, in blocks, of system 584 directory dinode */ 585 __le32 s_blocksize_bits; /* Blocksize for this fs */ 586 __le32 s_clustersize_bits; /* Clustersize for this fs */ 587 /*40*/ __le16 s_max_slots; /* Max number of simultaneous mounts 588 before tunefs required */ 589 __le16 s_tunefs_flag; 590 __le32 s_uuid_hash; /* hash value of uuid */ 591 __le64 s_first_cluster_group; /* Block offset of 1st cluster 592 * group header */ 593 /*50*/ __u8 s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */ 594 /*90*/ __u8 s_uuid[OCFS2_VOL_UUID_LEN]; /* 128-bit uuid */ 595 /*A0*/ struct ocfs2_cluster_info s_cluster_info; /* Selected userspace 596 stack. Only valid 597 with INCOMPAT flag. */ 598 /*B8*/ __le16 s_xattr_inline_size; /* extended attribute inline size 599 for this fs*/ 600 __le16 s_reserved0; 601 __le32 s_dx_seed[3]; /* seed[0-2] for dx dir hash. 602 * s_uuid_hash serves as seed[3]. */ 603 /*C0*/ __le64 s_reserved2[15]; /* Fill out superblock */ 604 /*140*/ 605 606 /* 607 * NOTE: As stated above, all offsets are relative to 608 * ocfs2_dinode.id2, which is at 0xC0 in the inode. 609 * 0xC0 + 0x140 = 0x200 or 512 bytes. A superblock must fit within 610 * our smallest blocksize, which is 512 bytes. To ensure this, 611 * we reserve the space in s_reserved2. Anything past s_reserved2 612 * will not be available on the smallest blocksize. 613 */ 614 }; 615 616 /* 617 * Local allocation bitmap for OCFS2 slots 618 * Note that it exists inside an ocfs2_dinode, so all offsets are 619 * relative to the start of ocfs2_dinode.id2. 620 */ 621 struct ocfs2_local_alloc 622 { 623 /*00*/ __le32 la_bm_off; /* Starting bit offset in main bitmap */ 624 __le16 la_size; /* Size of included bitmap, in bytes */ 625 __le16 la_reserved1; 626 __le64 la_reserved2; 627 /*10*/ __u8 la_bitmap[0]; 628 }; 629 630 /* 631 * Data-in-inode header. This is only used if i_dyn_features has 632 * OCFS2_INLINE_DATA_FL set. 633 */ 634 struct ocfs2_inline_data 635 { 636 /*00*/ __le16 id_count; /* Number of bytes that can be used 637 * for data, starting at id_data */ 638 __le16 id_reserved0; 639 __le32 id_reserved1; 640 __u8 id_data[0]; /* Start of user data */ 641 }; 642 643 /* 644 * On disk inode for OCFS2 645 */ 646 struct ocfs2_dinode { 647 /*00*/ __u8 i_signature[8]; /* Signature for validation */ 648 __le32 i_generation; /* Generation number */ 649 __le16 i_suballoc_slot; /* Slot suballocator this inode 650 belongs to */ 651 __le16 i_suballoc_bit; /* Bit offset in suballocator 652 block group */ 653 /*10*/ __le16 i_links_count_hi; /* High 16 bits of links count */ 654 __le16 i_xattr_inline_size; 655 __le32 i_clusters; /* Cluster count */ 656 __le32 i_uid; /* Owner UID */ 657 __le32 i_gid; /* Owning GID */ 658 /*20*/ __le64 i_size; /* Size in bytes */ 659 __le16 i_mode; /* File mode */ 660 __le16 i_links_count; /* Links count */ 661 __le32 i_flags; /* File flags */ 662 /*30*/ __le64 i_atime; /* Access time */ 663 __le64 i_ctime; /* Creation time */ 664 /*40*/ __le64 i_mtime; /* Modification time */ 665 __le64 i_dtime; /* Deletion time */ 666 /*50*/ __le64 i_blkno; /* Offset on disk, in blocks */ 667 __le64 i_last_eb_blk; /* Pointer to last extent 668 block */ 669 /*60*/ __le32 i_fs_generation; /* Generation per fs-instance */ 670 __le32 i_atime_nsec; 671 __le32 i_ctime_nsec; 672 __le32 i_mtime_nsec; 673 /*70*/ __le32 i_attr; 674 __le16 i_orphaned_slot; /* Only valid when OCFS2_ORPHANED_FL 675 was set in i_flags */ 676 __le16 i_dyn_features; 677 __le64 i_xattr_loc; 678 /*80*/ struct ocfs2_block_check i_check; /* Error checking */ 679 /*88*/ __le64 i_dx_root; /* Pointer to dir index root block */ 680 /*90*/ __le64 i_refcount_loc; 681 __le64 i_suballoc_loc; /* Suballocator block group this 682 inode belongs to. Only valid 683 if allocated from a 684 discontiguous block group */ 685 /*A0*/ __le64 i_reserved2[3]; 686 /*B8*/ union { 687 __le64 i_pad1; /* Generic way to refer to this 688 64bit union */ 689 struct { 690 __le64 i_rdev; /* Device number */ 691 } dev1; 692 struct { /* Info for bitmap system 693 inodes */ 694 __le32 i_used; /* Bits (ie, clusters) used */ 695 __le32 i_total; /* Total bits (clusters) 696 available */ 697 } bitmap1; 698 struct { /* Info for journal system 699 inodes */ 700 __le32 ij_flags; /* Mounted, version, etc. */ 701 __le32 ij_recovery_generation; /* Incremented when the 702 journal is recovered 703 after an unclean 704 shutdown */ 705 } journal1; 706 } id1; /* Inode type dependant 1 */ 707 /*C0*/ union { 708 struct ocfs2_super_block i_super; 709 struct ocfs2_local_alloc i_lab; 710 struct ocfs2_chain_list i_chain; 711 struct ocfs2_extent_list i_list; 712 struct ocfs2_truncate_log i_dealloc; 713 struct ocfs2_inline_data i_data; 714 __u8 i_symlink[0]; 715 } id2; 716 /* Actual on-disk size is one block */ 717 }; 718 719 /* 720 * On-disk directory entry structure for OCFS2 721 * 722 * Packed as this structure could be accessed unaligned on 64-bit platforms 723 */ 724 struct ocfs2_dir_entry { 725 /*00*/ __le64 inode; /* Inode number */ 726 __le16 rec_len; /* Directory entry length */ 727 __u8 name_len; /* Name length */ 728 __u8 file_type; 729 /*0C*/ char name[OCFS2_MAX_FILENAME_LEN]; /* File name */ 730 /* Actual on-disk length specified by rec_len */ 731 } __attribute__ ((packed)); 732 733 /* 734 * Per-block record for the unindexed directory btree. This is carefully 735 * crafted so that the rec_len and name_len records of an ocfs2_dir_entry are 736 * mirrored. That way, the directory manipulation code needs a minimal amount 737 * of update. 738 * 739 * NOTE: Keep this structure aligned to a multiple of 4 bytes. 740 */ 741 struct ocfs2_dir_block_trailer { 742 /*00*/ __le64 db_compat_inode; /* Always zero. Was inode */ 743 744 __le16 db_compat_rec_len; /* Backwards compatible with 745 * ocfs2_dir_entry. */ 746 __u8 db_compat_name_len; /* Always zero. Was name_len */ 747 __u8 db_reserved0; 748 __le16 db_reserved1; 749 __le16 db_free_rec_len; /* Size of largest empty hole 750 * in this block. (unused) */ 751 /*10*/ __u8 db_signature[8]; /* Signature for verification */ 752 __le64 db_reserved2; 753 __le64 db_free_next; /* Next block in list (unused) */ 754 /*20*/ __le64 db_blkno; /* Offset on disk, in blocks */ 755 __le64 db_parent_dinode; /* dinode which owns me, in 756 blocks */ 757 /*30*/ struct ocfs2_block_check db_check; /* Error checking */ 758 /*40*/ 759 }; 760 761 /* 762 * A directory entry in the indexed tree. We don't store the full name here, 763 * but instead provide a pointer to the full dirent in the unindexed tree. 764 * 765 * We also store name_len here so as to reduce the number of leaf blocks we 766 * need to search in case of collisions. 767 */ 768 struct ocfs2_dx_entry { 769 __le32 dx_major_hash; /* Used to find logical 770 * cluster in index */ 771 __le32 dx_minor_hash; /* Lower bits used to find 772 * block in cluster */ 773 __le64 dx_dirent_blk; /* Physical block in unindexed 774 * tree holding this dirent. */ 775 }; 776 777 struct ocfs2_dx_entry_list { 778 __le32 de_reserved; 779 __le16 de_count; /* Maximum number of entries 780 * possible in de_entries */ 781 __le16 de_num_used; /* Current number of 782 * de_entries entries */ 783 struct ocfs2_dx_entry de_entries[0]; /* Indexed dir entries 784 * in a packed array of 785 * length de_num_used */ 786 }; 787 788 #define OCFS2_DX_FLAG_INLINE 0x01 789 790 /* 791 * A directory indexing block. Each indexed directory has one of these, 792 * pointed to by ocfs2_dinode. 793 * 794 * This block stores an indexed btree root, and a set of free space 795 * start-of-list pointers. 796 */ 797 struct ocfs2_dx_root_block { 798 __u8 dr_signature[8]; /* Signature for verification */ 799 struct ocfs2_block_check dr_check; /* Error checking */ 800 __le16 dr_suballoc_slot; /* Slot suballocator this 801 * block belongs to. */ 802 __le16 dr_suballoc_bit; /* Bit offset in suballocator 803 * block group */ 804 __le32 dr_fs_generation; /* Must match super block */ 805 __le64 dr_blkno; /* Offset on disk, in blocks */ 806 __le64 dr_last_eb_blk; /* Pointer to last 807 * extent block */ 808 __le32 dr_clusters; /* Clusters allocated 809 * to the indexed tree. */ 810 __u8 dr_flags; /* OCFS2_DX_FLAG_* flags */ 811 __u8 dr_reserved0; 812 __le16 dr_reserved1; 813 __le64 dr_dir_blkno; /* Pointer to parent inode */ 814 __le32 dr_num_entries; /* Total number of 815 * names stored in 816 * this directory.*/ 817 __le32 dr_reserved2; 818 __le64 dr_free_blk; /* Pointer to head of free 819 * unindexed block list. */ 820 __le64 dr_suballoc_loc; /* Suballocator block group 821 this root belongs to. 822 Only valid if allocated 823 from a discontiguous 824 block group */ 825 __le64 dr_reserved3[14]; 826 union { 827 struct ocfs2_extent_list dr_list; /* Keep this aligned to 128 828 * bits for maximum space 829 * efficiency. */ 830 struct ocfs2_dx_entry_list dr_entries; /* In-root-block list of 831 * entries. We grow out 832 * to extents if this 833 * gets too big. */ 834 }; 835 }; 836 837 /* 838 * The header of a leaf block in the indexed tree. 839 */ 840 struct ocfs2_dx_leaf { 841 __u8 dl_signature[8];/* Signature for verification */ 842 struct ocfs2_block_check dl_check; /* Error checking */ 843 __le64 dl_blkno; /* Offset on disk, in blocks */ 844 __le32 dl_fs_generation;/* Must match super block */ 845 __le32 dl_reserved0; 846 __le64 dl_reserved1; 847 struct ocfs2_dx_entry_list dl_list; 848 }; 849 850 /* 851 * Largest bitmap for a block (suballocator) group in bytes. This limit 852 * does not affect cluster groups (global allocator). Cluster group 853 * bitmaps run to the end of the block. 854 */ 855 #define OCFS2_MAX_BG_BITMAP_SIZE 256 856 857 /* 858 * On disk allocator group structure for OCFS2 859 */ 860 struct ocfs2_group_desc 861 { 862 /*00*/ __u8 bg_signature[8]; /* Signature for validation */ 863 __le16 bg_size; /* Size of included bitmap in 864 bytes. */ 865 __le16 bg_bits; /* Bits represented by this 866 group. */ 867 __le16 bg_free_bits_count; /* Free bits count */ 868 __le16 bg_chain; /* What chain I am in. */ 869 /*10*/ __le32 bg_generation; 870 __le32 bg_reserved1; 871 __le64 bg_next_group; /* Next group in my list, in 872 blocks */ 873 /*20*/ __le64 bg_parent_dinode; /* dinode which owns me, in 874 blocks */ 875 __le64 bg_blkno; /* Offset on disk, in blocks */ 876 /*30*/ struct ocfs2_block_check bg_check; /* Error checking */ 877 __le64 bg_reserved2; 878 /*40*/ union { 879 __u8 bg_bitmap[0]; 880 struct { 881 /* 882 * Block groups may be discontiguous when 883 * OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG is set. 884 * The extents of a discontigous block group are 885 * stored in bg_list. It is a flat list. 886 * l_tree_depth must always be zero. A 887 * discontiguous group is signified by a non-zero 888 * bg_list->l_next_free_rec. Only block groups 889 * can be discontiguous; Cluster groups cannot. 890 * We've never made a block group with more than 891 * 2048 blocks (256 bytes of bg_bitmap). This 892 * codifies that limit so that we can fit bg_list. 893 * bg_size of a discontiguous block group will 894 * be 256 to match bg_bitmap_filler. 895 */ 896 __u8 bg_bitmap_filler[OCFS2_MAX_BG_BITMAP_SIZE]; 897 /*140*/ struct ocfs2_extent_list bg_list; 898 }; 899 }; 900 /* Actual on-disk size is one block */ 901 }; 902 903 struct ocfs2_refcount_rec { 904 /*00*/ __le64 r_cpos; /* Physical offset, in clusters */ 905 __le32 r_clusters; /* Clusters covered by this extent */ 906 __le32 r_refcount; /* Reference count of this extent */ 907 /*10*/ 908 }; 909 #define OCFS2_32BIT_POS_MASK (0xffffffffULL) 910 911 #define OCFS2_REFCOUNT_LEAF_FL (0x00000001) 912 #define OCFS2_REFCOUNT_TREE_FL (0x00000002) 913 914 struct ocfs2_refcount_list { 915 /*00*/ __le16 rl_count; /* Maximum number of entries possible 916 in rl_records */ 917 __le16 rl_used; /* Current number of used records */ 918 __le32 rl_reserved2; 919 __le64 rl_reserved1; /* Pad to sizeof(ocfs2_refcount_record) */ 920 /*10*/ struct ocfs2_refcount_rec rl_recs[0]; /* Refcount records */ 921 }; 922 923 924 struct ocfs2_refcount_block { 925 /*00*/ __u8 rf_signature[8]; /* Signature for verification */ 926 __le16 rf_suballoc_slot; /* Slot suballocator this block 927 belongs to */ 928 __le16 rf_suballoc_bit; /* Bit offset in suballocator 929 block group */ 930 __le32 rf_fs_generation; /* Must match superblock */ 931 /*10*/ __le64 rf_blkno; /* Offset on disk, in blocks */ 932 __le64 rf_parent; /* Parent block, only valid if 933 OCFS2_REFCOUNT_LEAF_FL is set in 934 rf_flags */ 935 /*20*/ struct ocfs2_block_check rf_check; /* Error checking */ 936 __le64 rf_last_eb_blk; /* Pointer to last extent block */ 937 /*30*/ __le32 rf_count; /* Number of inodes sharing this 938 refcount tree */ 939 __le32 rf_flags; /* See the flags above */ 940 __le32 rf_clusters; /* clusters covered by refcount tree. */ 941 __le32 rf_cpos; /* cluster offset in refcount tree.*/ 942 /*40*/ __le32 rf_generation; /* generation number. all be the same 943 * for the same refcount tree. */ 944 __le32 rf_reserved0; 945 __le64 rf_suballoc_loc; /* Suballocator block group this 946 refcount block belongs to. Only 947 valid if allocated from a 948 discontiguous block group */ 949 /*50*/ __le64 rf_reserved1[6]; 950 /*80*/ union { 951 struct ocfs2_refcount_list rf_records; /* List of refcount 952 records */ 953 struct ocfs2_extent_list rf_list; /* Extent record list, 954 only valid if 955 OCFS2_REFCOUNT_TREE_FL 956 is set in rf_flags */ 957 }; 958 /* Actual on-disk size is one block */ 959 }; 960 961 /* 962 * On disk extended attribute structure for OCFS2. 963 */ 964 965 /* 966 * ocfs2_xattr_entry indicates one extend attribute. 967 * 968 * Note that it can be stored in inode, one block or one xattr bucket. 969 */ 970 struct ocfs2_xattr_entry { 971 __le32 xe_name_hash; /* hash value of xattr prefix+suffix. */ 972 __le16 xe_name_offset; /* byte offset from the 1st entry in the 973 local xattr storage(inode, xattr block or 974 xattr bucket). */ 975 __u8 xe_name_len; /* xattr name len, does't include prefix. */ 976 __u8 xe_type; /* the low 7 bits indicate the name prefix 977 * type and the highest bit indicates whether 978 * the EA is stored in the local storage. */ 979 __le64 xe_value_size; /* real xattr value length. */ 980 }; 981 982 /* 983 * On disk structure for xattr header. 984 * 985 * One ocfs2_xattr_header describes how many ocfs2_xattr_entry records in 986 * the local xattr storage. 987 */ 988 struct ocfs2_xattr_header { 989 __le16 xh_count; /* contains the count of how 990 many records are in the 991 local xattr storage. */ 992 __le16 xh_free_start; /* current offset for storing 993 xattr. */ 994 __le16 xh_name_value_len; /* total length of name/value 995 length in this bucket. */ 996 __le16 xh_num_buckets; /* Number of xattr buckets 997 in this extent record, 998 only valid in the first 999 bucket. */ 1000 struct ocfs2_block_check xh_check; /* Error checking 1001 (Note, this is only 1002 used for xattr 1003 buckets. A block uses 1004 xb_check and sets 1005 this field to zero.) */ 1006 struct ocfs2_xattr_entry xh_entries[0]; /* xattr entry list. */ 1007 }; 1008 1009 /* 1010 * On disk structure for xattr value root. 1011 * 1012 * When an xattr's value is large enough, it is stored in an external 1013 * b-tree like file data. The xattr value root points to this structure. 1014 */ 1015 struct ocfs2_xattr_value_root { 1016 /*00*/ __le32 xr_clusters; /* clusters covered by xattr value. */ 1017 __le32 xr_reserved0; 1018 __le64 xr_last_eb_blk; /* Pointer to last extent block */ 1019 /*10*/ struct ocfs2_extent_list xr_list; /* Extent record list */ 1020 }; 1021 1022 /* 1023 * On disk structure for xattr tree root. 1024 * 1025 * It is used when there are too many extended attributes for one file. These 1026 * attributes will be organized and stored in an indexed-btree. 1027 */ 1028 struct ocfs2_xattr_tree_root { 1029 /*00*/ __le32 xt_clusters; /* clusters covered by xattr. */ 1030 __le32 xt_reserved0; 1031 __le64 xt_last_eb_blk; /* Pointer to last extent block */ 1032 /*10*/ struct ocfs2_extent_list xt_list; /* Extent record list */ 1033 }; 1034 1035 #define OCFS2_XATTR_INDEXED 0x1 1036 #define OCFS2_HASH_SHIFT 5 1037 #define OCFS2_XATTR_ROUND 3 1038 #define OCFS2_XATTR_SIZE(size) (((size) + OCFS2_XATTR_ROUND) & \ 1039 ~(OCFS2_XATTR_ROUND)) 1040 1041 #define OCFS2_XATTR_BUCKET_SIZE 4096 1042 #define OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET (OCFS2_XATTR_BUCKET_SIZE \ 1043 / OCFS2_MIN_BLOCKSIZE) 1044 1045 /* 1046 * On disk structure for xattr block. 1047 */ 1048 struct ocfs2_xattr_block { 1049 /*00*/ __u8 xb_signature[8]; /* Signature for verification */ 1050 __le16 xb_suballoc_slot; /* Slot suballocator this 1051 block belongs to. */ 1052 __le16 xb_suballoc_bit; /* Bit offset in suballocator 1053 block group */ 1054 __le32 xb_fs_generation; /* Must match super block */ 1055 /*10*/ __le64 xb_blkno; /* Offset on disk, in blocks */ 1056 struct ocfs2_block_check xb_check; /* Error checking */ 1057 /*20*/ __le16 xb_flags; /* Indicates whether this block contains 1058 real xattr or a xattr tree. */ 1059 __le16 xb_reserved0; 1060 __le32 xb_reserved1; 1061 __le64 xb_suballoc_loc; /* Suballocator block group this 1062 xattr block belongs to. Only 1063 valid if allocated from a 1064 discontiguous block group */ 1065 /*30*/ union { 1066 struct ocfs2_xattr_header xb_header; /* xattr header if this 1067 block contains xattr */ 1068 struct ocfs2_xattr_tree_root xb_root;/* xattr tree root if this 1069 block cotains xattr 1070 tree. */ 1071 } xb_attrs; 1072 }; 1073 1074 #define OCFS2_XATTR_ENTRY_LOCAL 0x80 1075 #define OCFS2_XATTR_TYPE_MASK 0x7F 1076 static inline void ocfs2_xattr_set_local(struct ocfs2_xattr_entry *xe, 1077 int local) 1078 { 1079 if (local) 1080 xe->xe_type |= OCFS2_XATTR_ENTRY_LOCAL; 1081 else 1082 xe->xe_type &= ~OCFS2_XATTR_ENTRY_LOCAL; 1083 } 1084 1085 static inline int ocfs2_xattr_is_local(struct ocfs2_xattr_entry *xe) 1086 { 1087 return xe->xe_type & OCFS2_XATTR_ENTRY_LOCAL; 1088 } 1089 1090 static inline void ocfs2_xattr_set_type(struct ocfs2_xattr_entry *xe, int type) 1091 { 1092 xe->xe_type |= type & OCFS2_XATTR_TYPE_MASK; 1093 } 1094 1095 static inline int ocfs2_xattr_get_type(struct ocfs2_xattr_entry *xe) 1096 { 1097 return xe->xe_type & OCFS2_XATTR_TYPE_MASK; 1098 } 1099 1100 /* 1101 * On disk structures for global quota file 1102 */ 1103 1104 /* Magic numbers and known versions for global quota files */ 1105 #define OCFS2_GLOBAL_QMAGICS {\ 1106 0x0cf52470, /* USRQUOTA */ \ 1107 0x0cf52471 /* GRPQUOTA */ \ 1108 } 1109 1110 #define OCFS2_GLOBAL_QVERSIONS {\ 1111 0, \ 1112 0, \ 1113 } 1114 1115 1116 /* Each block of each quota file has a certain fixed number of bytes reserved 1117 * for OCFS2 internal use at its end. OCFS2 can use it for things like 1118 * checksums, etc. */ 1119 #define OCFS2_QBLK_RESERVED_SPACE 8 1120 1121 /* Generic header of all quota files */ 1122 struct ocfs2_disk_dqheader { 1123 __le32 dqh_magic; /* Magic number identifying file */ 1124 __le32 dqh_version; /* Quota format version */ 1125 }; 1126 1127 #define OCFS2_GLOBAL_INFO_OFF (sizeof(struct ocfs2_disk_dqheader)) 1128 1129 /* Information header of global quota file (immediately follows the generic 1130 * header) */ 1131 struct ocfs2_global_disk_dqinfo { 1132 /*00*/ __le32 dqi_bgrace; /* Grace time for space softlimit excess */ 1133 __le32 dqi_igrace; /* Grace time for inode softlimit excess */ 1134 __le32 dqi_syncms; /* Time after which we sync local changes to 1135 * global quota file */ 1136 __le32 dqi_blocks; /* Number of blocks in quota file */ 1137 /*10*/ __le32 dqi_free_blk; /* First free block in quota file */ 1138 __le32 dqi_free_entry; /* First block with free dquot entry in quota 1139 * file */ 1140 }; 1141 1142 /* Structure with global user / group information. We reserve some space 1143 * for future use. */ 1144 struct ocfs2_global_disk_dqblk { 1145 /*00*/ __le32 dqb_id; /* ID the structure belongs to */ 1146 __le32 dqb_use_count; /* Number of nodes having reference to this structure */ 1147 __le64 dqb_ihardlimit; /* absolute limit on allocated inodes */ 1148 /*10*/ __le64 dqb_isoftlimit; /* preferred inode limit */ 1149 __le64 dqb_curinodes; /* current # allocated inodes */ 1150 /*20*/ __le64 dqb_bhardlimit; /* absolute limit on disk space */ 1151 __le64 dqb_bsoftlimit; /* preferred limit on disk space */ 1152 /*30*/ __le64 dqb_curspace; /* current space occupied */ 1153 __le64 dqb_btime; /* time limit for excessive disk use */ 1154 /*40*/ __le64 dqb_itime; /* time limit for excessive inode use */ 1155 __le64 dqb_pad1; 1156 /*50*/ __le64 dqb_pad2; 1157 }; 1158 1159 /* 1160 * On-disk structures for local quota file 1161 */ 1162 1163 /* Magic numbers and known versions for local quota files */ 1164 #define OCFS2_LOCAL_QMAGICS {\ 1165 0x0cf524c0, /* USRQUOTA */ \ 1166 0x0cf524c1 /* GRPQUOTA */ \ 1167 } 1168 1169 #define OCFS2_LOCAL_QVERSIONS {\ 1170 0, \ 1171 0, \ 1172 } 1173 1174 /* Quota flags in dqinfo header */ 1175 #define OLQF_CLEAN 0x0001 /* Quota file is empty (this should be after\ 1176 * quota has been cleanly turned off) */ 1177 1178 #define OCFS2_LOCAL_INFO_OFF (sizeof(struct ocfs2_disk_dqheader)) 1179 1180 /* Information header of local quota file (immediately follows the generic 1181 * header) */ 1182 struct ocfs2_local_disk_dqinfo { 1183 __le32 dqi_flags; /* Flags for quota file */ 1184 __le32 dqi_chunks; /* Number of chunks of quota structures 1185 * with a bitmap */ 1186 __le32 dqi_blocks; /* Number of blocks allocated for quota file */ 1187 }; 1188 1189 /* Header of one chunk of a quota file */ 1190 struct ocfs2_local_disk_chunk { 1191 __le32 dqc_free; /* Number of free entries in the bitmap */ 1192 __u8 dqc_bitmap[0]; /* Bitmap of entries in the corresponding 1193 * chunk of quota file */ 1194 }; 1195 1196 /* One entry in local quota file */ 1197 struct ocfs2_local_disk_dqblk { 1198 /*00*/ __le64 dqb_id; /* id this quota applies to */ 1199 __le64 dqb_spacemod; /* Change in the amount of used space */ 1200 /*10*/ __le64 dqb_inodemod; /* Change in the amount of used inodes */ 1201 }; 1202 1203 1204 /* 1205 * The quota trailer lives at the end of each quota block. 1206 */ 1207 1208 struct ocfs2_disk_dqtrailer { 1209 /*00*/ struct ocfs2_block_check dq_check; /* Error checking */ 1210 /*08*/ /* Cannot be larger than OCFS2_QBLK_RESERVED_SPACE */ 1211 }; 1212 1213 static inline struct ocfs2_disk_dqtrailer *ocfs2_block_dqtrailer(int blocksize, 1214 void *buf) 1215 { 1216 char *ptr = buf; 1217 ptr += blocksize - OCFS2_QBLK_RESERVED_SPACE; 1218 1219 return (struct ocfs2_disk_dqtrailer *)ptr; 1220 } 1221 1222 #ifdef __KERNEL__ 1223 static inline int ocfs2_fast_symlink_chars(struct super_block *sb) 1224 { 1225 return sb->s_blocksize - 1226 offsetof(struct ocfs2_dinode, id2.i_symlink); 1227 } 1228 1229 static inline int ocfs2_max_inline_data_with_xattr(struct super_block *sb, 1230 struct ocfs2_dinode *di) 1231 { 1232 unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size); 1233 1234 if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL) 1235 return sb->s_blocksize - 1236 offsetof(struct ocfs2_dinode, id2.i_data.id_data) - 1237 xattrsize; 1238 else 1239 return sb->s_blocksize - 1240 offsetof(struct ocfs2_dinode, id2.i_data.id_data); 1241 } 1242 1243 static inline int ocfs2_extent_recs_per_inode(struct super_block *sb) 1244 { 1245 int size; 1246 1247 size = sb->s_blocksize - 1248 offsetof(struct ocfs2_dinode, id2.i_list.l_recs); 1249 1250 return size / sizeof(struct ocfs2_extent_rec); 1251 } 1252 1253 static inline int ocfs2_extent_recs_per_inode_with_xattr( 1254 struct super_block *sb, 1255 struct ocfs2_dinode *di) 1256 { 1257 int size; 1258 unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size); 1259 1260 if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL) 1261 size = sb->s_blocksize - 1262 offsetof(struct ocfs2_dinode, id2.i_list.l_recs) - 1263 xattrsize; 1264 else 1265 size = sb->s_blocksize - 1266 offsetof(struct ocfs2_dinode, id2.i_list.l_recs); 1267 1268 return size / sizeof(struct ocfs2_extent_rec); 1269 } 1270 1271 static inline int ocfs2_extent_recs_per_dx_root(struct super_block *sb) 1272 { 1273 int size; 1274 1275 size = sb->s_blocksize - 1276 offsetof(struct ocfs2_dx_root_block, dr_list.l_recs); 1277 1278 return size / sizeof(struct ocfs2_extent_rec); 1279 } 1280 1281 static inline int ocfs2_chain_recs_per_inode(struct super_block *sb) 1282 { 1283 int size; 1284 1285 size = sb->s_blocksize - 1286 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs); 1287 1288 return size / sizeof(struct ocfs2_chain_rec); 1289 } 1290 1291 static inline u16 ocfs2_extent_recs_per_eb(struct super_block *sb) 1292 { 1293 int size; 1294 1295 size = sb->s_blocksize - 1296 offsetof(struct ocfs2_extent_block, h_list.l_recs); 1297 1298 return size / sizeof(struct ocfs2_extent_rec); 1299 } 1300 1301 static inline u16 ocfs2_extent_recs_per_gd(struct super_block *sb) 1302 { 1303 int size; 1304 1305 size = sb->s_blocksize - 1306 offsetof(struct ocfs2_group_desc, bg_list.l_recs); 1307 1308 return size / sizeof(struct ocfs2_extent_rec); 1309 } 1310 1311 static inline int ocfs2_dx_entries_per_leaf(struct super_block *sb) 1312 { 1313 int size; 1314 1315 size = sb->s_blocksize - 1316 offsetof(struct ocfs2_dx_leaf, dl_list.de_entries); 1317 1318 return size / sizeof(struct ocfs2_dx_entry); 1319 } 1320 1321 static inline int ocfs2_dx_entries_per_root(struct super_block *sb) 1322 { 1323 int size; 1324 1325 size = sb->s_blocksize - 1326 offsetof(struct ocfs2_dx_root_block, dr_entries.de_entries); 1327 1328 return size / sizeof(struct ocfs2_dx_entry); 1329 } 1330 1331 static inline u16 ocfs2_local_alloc_size(struct super_block *sb) 1332 { 1333 u16 size; 1334 1335 size = sb->s_blocksize - 1336 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap); 1337 1338 return size; 1339 } 1340 1341 static inline int ocfs2_group_bitmap_size(struct super_block *sb, 1342 int suballocator, 1343 u32 feature_incompat) 1344 { 1345 int size = sb->s_blocksize - 1346 offsetof(struct ocfs2_group_desc, bg_bitmap); 1347 1348 /* 1349 * The cluster allocator uses the entire block. Suballocators have 1350 * never used more than OCFS2_MAX_BG_BITMAP_SIZE. Unfortunately, older 1351 * code expects bg_size set to the maximum. Thus we must keep 1352 * bg_size as-is unless discontig_bg is enabled. 1353 */ 1354 if (suballocator && 1355 (feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG)) 1356 size = OCFS2_MAX_BG_BITMAP_SIZE; 1357 1358 return size; 1359 } 1360 1361 static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb) 1362 { 1363 int size; 1364 1365 size = sb->s_blocksize - 1366 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs); 1367 1368 return size / sizeof(struct ocfs2_truncate_rec); 1369 } 1370 1371 static inline u64 ocfs2_backup_super_blkno(struct super_block *sb, int index) 1372 { 1373 u64 offset = OCFS2_BACKUP_SB_START; 1374 1375 if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) { 1376 offset <<= (2 * index); 1377 offset >>= sb->s_blocksize_bits; 1378 return offset; 1379 } 1380 1381 return 0; 1382 1383 } 1384 1385 static inline u16 ocfs2_xattr_recs_per_xb(struct super_block *sb) 1386 { 1387 int size; 1388 1389 size = sb->s_blocksize - 1390 offsetof(struct ocfs2_xattr_block, 1391 xb_attrs.xb_root.xt_list.l_recs); 1392 1393 return size / sizeof(struct ocfs2_extent_rec); 1394 } 1395 1396 static inline u16 ocfs2_extent_recs_per_rb(struct super_block *sb) 1397 { 1398 int size; 1399 1400 size = sb->s_blocksize - 1401 offsetof(struct ocfs2_refcount_block, rf_list.l_recs); 1402 1403 return size / sizeof(struct ocfs2_extent_rec); 1404 } 1405 1406 static inline u16 ocfs2_refcount_recs_per_rb(struct super_block *sb) 1407 { 1408 int size; 1409 1410 size = sb->s_blocksize - 1411 offsetof(struct ocfs2_refcount_block, rf_records.rl_recs); 1412 1413 return size / sizeof(struct ocfs2_refcount_rec); 1414 } 1415 1416 static inline u32 1417 ocfs2_get_ref_rec_low_cpos(const struct ocfs2_refcount_rec *rec) 1418 { 1419 return le64_to_cpu(rec->r_cpos) & OCFS2_32BIT_POS_MASK; 1420 } 1421 #else 1422 static inline int ocfs2_fast_symlink_chars(int blocksize) 1423 { 1424 return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink); 1425 } 1426 1427 static inline int ocfs2_max_inline_data_with_xattr(int blocksize, 1428 struct ocfs2_dinode *di) 1429 { 1430 if (di && (di->i_dyn_features & OCFS2_INLINE_XATTR_FL)) 1431 return blocksize - 1432 offsetof(struct ocfs2_dinode, id2.i_data.id_data) - 1433 di->i_xattr_inline_size; 1434 else 1435 return blocksize - 1436 offsetof(struct ocfs2_dinode, id2.i_data.id_data); 1437 } 1438 1439 static inline int ocfs2_extent_recs_per_inode(int blocksize) 1440 { 1441 int size; 1442 1443 size = blocksize - 1444 offsetof(struct ocfs2_dinode, id2.i_list.l_recs); 1445 1446 return size / sizeof(struct ocfs2_extent_rec); 1447 } 1448 1449 static inline int ocfs2_chain_recs_per_inode(int blocksize) 1450 { 1451 int size; 1452 1453 size = blocksize - 1454 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs); 1455 1456 return size / sizeof(struct ocfs2_chain_rec); 1457 } 1458 1459 static inline int ocfs2_extent_recs_per_eb(int blocksize) 1460 { 1461 int size; 1462 1463 size = blocksize - 1464 offsetof(struct ocfs2_extent_block, h_list.l_recs); 1465 1466 return size / sizeof(struct ocfs2_extent_rec); 1467 } 1468 1469 static inline int ocfs2_extent_recs_per_gd(int blocksize) 1470 { 1471 int size; 1472 1473 size = blocksize - 1474 offsetof(struct ocfs2_group_desc, bg_list.l_recs); 1475 1476 return size / sizeof(struct ocfs2_extent_rec); 1477 } 1478 1479 static inline int ocfs2_local_alloc_size(int blocksize) 1480 { 1481 int size; 1482 1483 size = blocksize - 1484 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap); 1485 1486 return size; 1487 } 1488 1489 static inline int ocfs2_group_bitmap_size(int blocksize, 1490 int suballocator, 1491 uint32_t feature_incompat) 1492 { 1493 int size = sb->s_blocksize - 1494 offsetof(struct ocfs2_group_desc, bg_bitmap); 1495 1496 /* 1497 * The cluster allocator uses the entire block. Suballocators have 1498 * never used more than OCFS2_MAX_BG_BITMAP_SIZE. Unfortunately, older 1499 * code expects bg_size set to the maximum. Thus we must keep 1500 * bg_size as-is unless discontig_bg is enabled. 1501 */ 1502 if (suballocator && 1503 (feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG)) 1504 size = OCFS2_MAX_BG_BITMAP_SIZE; 1505 1506 return size; 1507 } 1508 1509 static inline int ocfs2_truncate_recs_per_inode(int blocksize) 1510 { 1511 int size; 1512 1513 size = blocksize - 1514 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs); 1515 1516 return size / sizeof(struct ocfs2_truncate_rec); 1517 } 1518 1519 static inline uint64_t ocfs2_backup_super_blkno(int blocksize, int index) 1520 { 1521 uint64_t offset = OCFS2_BACKUP_SB_START; 1522 1523 if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) { 1524 offset <<= (2 * index); 1525 offset /= blocksize; 1526 return offset; 1527 } 1528 1529 return 0; 1530 } 1531 1532 static inline int ocfs2_xattr_recs_per_xb(int blocksize) 1533 { 1534 int size; 1535 1536 size = blocksize - 1537 offsetof(struct ocfs2_xattr_block, 1538 xb_attrs.xb_root.xt_list.l_recs); 1539 1540 return size / sizeof(struct ocfs2_extent_rec); 1541 } 1542 #endif /* __KERNEL__ */ 1543 1544 1545 static inline int ocfs2_system_inode_is_global(int type) 1546 { 1547 return ((type >= 0) && 1548 (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE)); 1549 } 1550 1551 static inline int ocfs2_sprintf_system_inode_name(char *buf, int len, 1552 int type, int slot) 1553 { 1554 int chars; 1555 1556 /* 1557 * Global system inodes can only have one copy. Everything 1558 * after OCFS2_LAST_GLOBAL_SYSTEM_INODE in the system inode 1559 * list has a copy per slot. 1560 */ 1561 if (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE) 1562 chars = snprintf(buf, len, "%s", 1563 ocfs2_system_inodes[type].si_name); 1564 else 1565 chars = snprintf(buf, len, 1566 ocfs2_system_inodes[type].si_name, 1567 slot); 1568 1569 return chars; 1570 } 1571 1572 static inline void ocfs2_set_de_type(struct ocfs2_dir_entry *de, 1573 umode_t mode) 1574 { 1575 de->file_type = ocfs2_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 1576 } 1577 1578 static inline int ocfs2_gd_is_discontig(struct ocfs2_group_desc *gd) 1579 { 1580 if ((offsetof(struct ocfs2_group_desc, bg_bitmap) + 1581 le16_to_cpu(gd->bg_size)) != 1582 offsetof(struct ocfs2_group_desc, bg_list)) 1583 return 0; 1584 /* 1585 * Only valid to check l_next_free_rec if 1586 * bg_bitmap + bg_size == bg_list. 1587 */ 1588 if (!gd->bg_list.l_next_free_rec) 1589 return 0; 1590 return 1; 1591 } 1592 #endif /* _OCFS2_FS_H */ 1593 1594