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 68 /* Compatibility flags */ 69 #define OCFS2_HAS_COMPAT_FEATURE(sb,mask) \ 70 ( OCFS2_SB(sb)->s_feature_compat & (mask) ) 71 #define OCFS2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 72 ( OCFS2_SB(sb)->s_feature_ro_compat & (mask) ) 73 #define OCFS2_HAS_INCOMPAT_FEATURE(sb,mask) \ 74 ( OCFS2_SB(sb)->s_feature_incompat & (mask) ) 75 #define OCFS2_SET_COMPAT_FEATURE(sb,mask) \ 76 OCFS2_SB(sb)->s_feature_compat |= (mask) 77 #define OCFS2_SET_RO_COMPAT_FEATURE(sb,mask) \ 78 OCFS2_SB(sb)->s_feature_ro_compat |= (mask) 79 #define OCFS2_SET_INCOMPAT_FEATURE(sb,mask) \ 80 OCFS2_SB(sb)->s_feature_incompat |= (mask) 81 #define OCFS2_CLEAR_COMPAT_FEATURE(sb,mask) \ 82 OCFS2_SB(sb)->s_feature_compat &= ~(mask) 83 #define OCFS2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 84 OCFS2_SB(sb)->s_feature_ro_compat &= ~(mask) 85 #define OCFS2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 86 OCFS2_SB(sb)->s_feature_incompat &= ~(mask) 87 88 #define OCFS2_FEATURE_COMPAT_SUPP OCFS2_FEATURE_COMPAT_BACKUP_SB 89 #define OCFS2_FEATURE_INCOMPAT_SUPP (OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT \ 90 | OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC \ 91 | OCFS2_FEATURE_INCOMPAT_INLINE_DATA) 92 #define OCFS2_FEATURE_RO_COMPAT_SUPP OCFS2_FEATURE_RO_COMPAT_UNWRITTEN 93 94 /* 95 * Heartbeat-only devices are missing journals and other files. The 96 * filesystem driver can't load them, but the library can. Never put 97 * this in OCFS2_FEATURE_INCOMPAT_SUPP, *ever*. 98 */ 99 #define OCFS2_FEATURE_INCOMPAT_HEARTBEAT_DEV 0x0002 100 101 /* 102 * tunefs sets this incompat flag before starting the resize and clears it 103 * at the end. This flag protects users from inadvertently mounting the fs 104 * after an aborted run without fsck-ing. 105 */ 106 #define OCFS2_FEATURE_INCOMPAT_RESIZE_INPROG 0x0004 107 108 /* Used to denote a non-clustered volume */ 109 #define OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT 0x0008 110 111 /* Support for sparse allocation in b-trees */ 112 #define OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC 0x0010 113 114 /* 115 * Tunefs sets this incompat flag before starting an operation which 116 * would require cleanup on abort. This is done to protect users from 117 * inadvertently mounting the fs after an aborted run without 118 * fsck-ing. 119 * 120 * s_tunefs_flags on the super block describes precisely which 121 * operations were in progress. 122 */ 123 #define OCFS2_FEATURE_INCOMPAT_TUNEFS_INPROG 0x0020 124 125 /* Support for data packed into inode blocks */ 126 #define OCFS2_FEATURE_INCOMPAT_INLINE_DATA 0x0040 127 128 /* 129 * backup superblock flag is used to indicate that this volume 130 * has backup superblocks. 131 */ 132 #define OCFS2_FEATURE_COMPAT_BACKUP_SB 0x0001 133 134 /* 135 * Unwritten extents support. 136 */ 137 #define OCFS2_FEATURE_RO_COMPAT_UNWRITTEN 0x0001 138 139 /* The byte offset of the first backup block will be 1G. 140 * The following will be 4G, 16G, 64G, 256G and 1T. 141 */ 142 #define OCFS2_BACKUP_SB_START 1 << 30 143 144 /* the max backup superblock nums */ 145 #define OCFS2_MAX_BACKUP_SUPERBLOCKS 6 146 147 /* 148 * Flags on ocfs2_super_block.s_tunefs_flags 149 */ 150 #define OCFS2_TUNEFS_INPROG_REMOVE_SLOT 0x0001 /* Removing slots */ 151 152 /* 153 * Flags on ocfs2_dinode.i_flags 154 */ 155 #define OCFS2_VALID_FL (0x00000001) /* Inode is valid */ 156 #define OCFS2_UNUSED2_FL (0x00000002) 157 #define OCFS2_ORPHANED_FL (0x00000004) /* On the orphan list */ 158 #define OCFS2_UNUSED3_FL (0x00000008) 159 /* System inode flags */ 160 #define OCFS2_SYSTEM_FL (0x00000010) /* System inode */ 161 #define OCFS2_SUPER_BLOCK_FL (0x00000020) /* Super block */ 162 #define OCFS2_LOCAL_ALLOC_FL (0x00000040) /* Slot local alloc bitmap */ 163 #define OCFS2_BITMAP_FL (0x00000080) /* Allocation bitmap */ 164 #define OCFS2_JOURNAL_FL (0x00000100) /* Slot local journal */ 165 #define OCFS2_HEARTBEAT_FL (0x00000200) /* Heartbeat area */ 166 #define OCFS2_CHAIN_FL (0x00000400) /* Chain allocator */ 167 #define OCFS2_DEALLOC_FL (0x00000800) /* Truncate log */ 168 169 /* 170 * Flags on ocfs2_dinode.i_dyn_features 171 * 172 * These can change much more often than i_flags. When adding flags, 173 * keep in mind that i_dyn_features is only 16 bits wide. 174 */ 175 #define OCFS2_INLINE_DATA_FL (0x0001) /* Data stored in inode block */ 176 #define OCFS2_HAS_XATTR_FL (0x0002) 177 #define OCFS2_INLINE_XATTR_FL (0x0004) 178 #define OCFS2_INDEXED_DIR_FL (0x0008) 179 180 /* Inode attributes, keep in sync with EXT2 */ 181 #define OCFS2_SECRM_FL (0x00000001) /* Secure deletion */ 182 #define OCFS2_UNRM_FL (0x00000002) /* Undelete */ 183 #define OCFS2_COMPR_FL (0x00000004) /* Compress file */ 184 #define OCFS2_SYNC_FL (0x00000008) /* Synchronous updates */ 185 #define OCFS2_IMMUTABLE_FL (0x00000010) /* Immutable file */ 186 #define OCFS2_APPEND_FL (0x00000020) /* writes to file may only append */ 187 #define OCFS2_NODUMP_FL (0x00000040) /* do not dump file */ 188 #define OCFS2_NOATIME_FL (0x00000080) /* do not update atime */ 189 #define OCFS2_DIRSYNC_FL (0x00010000) /* dirsync behaviour (directories only) */ 190 191 #define OCFS2_FL_VISIBLE (0x000100FF) /* User visible flags */ 192 #define OCFS2_FL_MODIFIABLE (0x000100FF) /* User modifiable flags */ 193 194 /* 195 * Extent record flags (e_node.leaf.flags) 196 */ 197 #define OCFS2_EXT_UNWRITTEN (0x01) /* Extent is allocated but 198 * unwritten */ 199 200 /* 201 * ioctl commands 202 */ 203 #define OCFS2_IOC_GETFLAGS _IOR('f', 1, long) 204 #define OCFS2_IOC_SETFLAGS _IOW('f', 2, long) 205 #define OCFS2_IOC32_GETFLAGS _IOR('f', 1, int) 206 #define OCFS2_IOC32_SETFLAGS _IOW('f', 2, int) 207 208 /* 209 * Space reservation / allocation / free ioctls and argument structure 210 * are designed to be compatible with XFS. 211 * 212 * ALLOCSP* and FREESP* are not and will never be supported, but are 213 * included here for completeness. 214 */ 215 struct ocfs2_space_resv { 216 __s16 l_type; 217 __s16 l_whence; 218 __s64 l_start; 219 __s64 l_len; /* len == 0 means until end of file */ 220 __s32 l_sysid; 221 __u32 l_pid; 222 __s32 l_pad[4]; /* reserve area */ 223 }; 224 225 #define OCFS2_IOC_ALLOCSP _IOW ('X', 10, struct ocfs2_space_resv) 226 #define OCFS2_IOC_FREESP _IOW ('X', 11, struct ocfs2_space_resv) 227 #define OCFS2_IOC_RESVSP _IOW ('X', 40, struct ocfs2_space_resv) 228 #define OCFS2_IOC_UNRESVSP _IOW ('X', 41, struct ocfs2_space_resv) 229 #define OCFS2_IOC_ALLOCSP64 _IOW ('X', 36, struct ocfs2_space_resv) 230 #define OCFS2_IOC_FREESP64 _IOW ('X', 37, struct ocfs2_space_resv) 231 #define OCFS2_IOC_RESVSP64 _IOW ('X', 42, struct ocfs2_space_resv) 232 #define OCFS2_IOC_UNRESVSP64 _IOW ('X', 43, struct ocfs2_space_resv) 233 234 /* Used to pass group descriptor data when online resize is done */ 235 struct ocfs2_new_group_input { 236 __u64 group; /* Group descriptor's blkno. */ 237 __u32 clusters; /* Total number of clusters in this group */ 238 __u32 frees; /* Total free clusters in this group */ 239 __u16 chain; /* Chain for this group */ 240 __u16 reserved1; 241 __u32 reserved2; 242 }; 243 244 #define OCFS2_IOC_GROUP_EXTEND _IOW('o', 1, int) 245 #define OCFS2_IOC_GROUP_ADD _IOW('o', 2,struct ocfs2_new_group_input) 246 #define OCFS2_IOC_GROUP_ADD64 _IOW('o', 3,struct ocfs2_new_group_input) 247 248 /* 249 * Journal Flags (ocfs2_dinode.id1.journal1.i_flags) 250 */ 251 #define OCFS2_JOURNAL_DIRTY_FL (0x00000001) /* Journal needs recovery */ 252 253 /* 254 * superblock s_state flags 255 */ 256 #define OCFS2_ERROR_FS (0x00000001) /* FS saw errors */ 257 258 /* Limit of space in ocfs2_dir_entry */ 259 #define OCFS2_MAX_FILENAME_LEN 255 260 261 /* Maximum slots on an ocfs2 file system */ 262 #define OCFS2_MAX_SLOTS 255 263 264 /* Slot map indicator for an empty slot */ 265 #define OCFS2_INVALID_SLOT -1 266 267 #define OCFS2_VOL_UUID_LEN 16 268 #define OCFS2_MAX_VOL_LABEL_LEN 64 269 270 /* Journal limits (in bytes) */ 271 #define OCFS2_MIN_JOURNAL_SIZE (4 * 1024 * 1024) 272 273 /* 274 * Default local alloc size (in megabytes) 275 * 276 * The value chosen should be such that most allocations, including new 277 * block groups, use local alloc. 278 */ 279 #define OCFS2_DEFAULT_LOCAL_ALLOC_SIZE 8 280 281 struct ocfs2_system_inode_info { 282 char *si_name; 283 int si_iflags; 284 int si_mode; 285 }; 286 287 /* System file index */ 288 enum { 289 BAD_BLOCK_SYSTEM_INODE = 0, 290 GLOBAL_INODE_ALLOC_SYSTEM_INODE, 291 SLOT_MAP_SYSTEM_INODE, 292 #define OCFS2_FIRST_ONLINE_SYSTEM_INODE SLOT_MAP_SYSTEM_INODE 293 HEARTBEAT_SYSTEM_INODE, 294 GLOBAL_BITMAP_SYSTEM_INODE, 295 #define OCFS2_LAST_GLOBAL_SYSTEM_INODE GLOBAL_BITMAP_SYSTEM_INODE 296 ORPHAN_DIR_SYSTEM_INODE, 297 EXTENT_ALLOC_SYSTEM_INODE, 298 INODE_ALLOC_SYSTEM_INODE, 299 JOURNAL_SYSTEM_INODE, 300 LOCAL_ALLOC_SYSTEM_INODE, 301 TRUNCATE_LOG_SYSTEM_INODE, 302 NUM_SYSTEM_INODES 303 }; 304 305 static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = { 306 /* Global system inodes (single copy) */ 307 /* The first two are only used from userspace mfks/tunefs */ 308 [BAD_BLOCK_SYSTEM_INODE] = { "bad_blocks", 0, S_IFREG | 0644 }, 309 [GLOBAL_INODE_ALLOC_SYSTEM_INODE] = { "global_inode_alloc", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, 310 311 /* These are used by the running filesystem */ 312 [SLOT_MAP_SYSTEM_INODE] = { "slot_map", 0, S_IFREG | 0644 }, 313 [HEARTBEAT_SYSTEM_INODE] = { "heartbeat", OCFS2_HEARTBEAT_FL, S_IFREG | 0644 }, 314 [GLOBAL_BITMAP_SYSTEM_INODE] = { "global_bitmap", 0, S_IFREG | 0644 }, 315 316 /* Slot-specific system inodes (one copy per slot) */ 317 [ORPHAN_DIR_SYSTEM_INODE] = { "orphan_dir:%04d", 0, S_IFDIR | 0755 }, 318 [EXTENT_ALLOC_SYSTEM_INODE] = { "extent_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, 319 [INODE_ALLOC_SYSTEM_INODE] = { "inode_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, 320 [JOURNAL_SYSTEM_INODE] = { "journal:%04d", OCFS2_JOURNAL_FL, S_IFREG | 0644 }, 321 [LOCAL_ALLOC_SYSTEM_INODE] = { "local_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_LOCAL_ALLOC_FL, S_IFREG | 0644 }, 322 [TRUNCATE_LOG_SYSTEM_INODE] = { "truncate_log:%04d", OCFS2_DEALLOC_FL, S_IFREG | 0644 } 323 }; 324 325 /* Parameter passed from mount.ocfs2 to module */ 326 #define OCFS2_HB_NONE "heartbeat=none" 327 #define OCFS2_HB_LOCAL "heartbeat=local" 328 329 /* 330 * OCFS2 directory file types. Only the low 3 bits are used. The 331 * other bits are reserved for now. 332 */ 333 #define OCFS2_FT_UNKNOWN 0 334 #define OCFS2_FT_REG_FILE 1 335 #define OCFS2_FT_DIR 2 336 #define OCFS2_FT_CHRDEV 3 337 #define OCFS2_FT_BLKDEV 4 338 #define OCFS2_FT_FIFO 5 339 #define OCFS2_FT_SOCK 6 340 #define OCFS2_FT_SYMLINK 7 341 342 #define OCFS2_FT_MAX 8 343 344 /* 345 * OCFS2_DIR_PAD defines the directory entries boundaries 346 * 347 * NOTE: It must be a multiple of 4 348 */ 349 #define OCFS2_DIR_PAD 4 350 #define OCFS2_DIR_ROUND (OCFS2_DIR_PAD - 1) 351 #define OCFS2_DIR_MEMBER_LEN offsetof(struct ocfs2_dir_entry, name) 352 #define OCFS2_DIR_REC_LEN(name_len) (((name_len) + OCFS2_DIR_MEMBER_LEN + \ 353 OCFS2_DIR_ROUND) & \ 354 ~OCFS2_DIR_ROUND) 355 356 #define OCFS2_LINK_MAX 32000 357 358 #define S_SHIFT 12 359 static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = { 360 [S_IFREG >> S_SHIFT] = OCFS2_FT_REG_FILE, 361 [S_IFDIR >> S_SHIFT] = OCFS2_FT_DIR, 362 [S_IFCHR >> S_SHIFT] = OCFS2_FT_CHRDEV, 363 [S_IFBLK >> S_SHIFT] = OCFS2_FT_BLKDEV, 364 [S_IFIFO >> S_SHIFT] = OCFS2_FT_FIFO, 365 [S_IFSOCK >> S_SHIFT] = OCFS2_FT_SOCK, 366 [S_IFLNK >> S_SHIFT] = OCFS2_FT_SYMLINK, 367 }; 368 369 370 /* 371 * Convenience casts 372 */ 373 #define OCFS2_RAW_SB(dinode) (&((dinode)->id2.i_super)) 374 375 /* 376 * On disk extent record for OCFS2 377 * It describes a range of clusters on disk. 378 * 379 * Length fields are divided into interior and leaf node versions. 380 * This leaves room for a flags field (OCFS2_EXT_*) in the leaf nodes. 381 */ 382 struct ocfs2_extent_rec { 383 /*00*/ __le32 e_cpos; /* Offset into the file, in clusters */ 384 union { 385 __le32 e_int_clusters; /* Clusters covered by all children */ 386 struct { 387 __le16 e_leaf_clusters; /* Clusters covered by this 388 extent */ 389 __u8 e_reserved1; 390 __u8 e_flags; /* Extent flags */ 391 }; 392 }; 393 __le64 e_blkno; /* Physical disk offset, in blocks */ 394 /*10*/ 395 }; 396 397 struct ocfs2_chain_rec { 398 __le32 c_free; /* Number of free bits in this chain. */ 399 __le32 c_total; /* Number of total bits in this chain */ 400 __le64 c_blkno; /* Physical disk offset (blocks) of 1st group */ 401 }; 402 403 struct ocfs2_truncate_rec { 404 __le32 t_start; /* 1st cluster in this log */ 405 __le32 t_clusters; /* Number of total clusters covered */ 406 }; 407 408 /* 409 * On disk extent list for OCFS2 (node in the tree). Note that this 410 * is contained inside ocfs2_dinode or ocfs2_extent_block, so the 411 * offsets are relative to ocfs2_dinode.id2.i_list or 412 * ocfs2_extent_block.h_list, respectively. 413 */ 414 struct ocfs2_extent_list { 415 /*00*/ __le16 l_tree_depth; /* Extent tree depth from this 416 point. 0 means data extents 417 hang directly off this 418 header (a leaf) 419 NOTE: The high 8 bits cannot be 420 used - tree_depth is never that big. 421 */ 422 __le16 l_count; /* Number of extent records */ 423 __le16 l_next_free_rec; /* Next unused extent slot */ 424 __le16 l_reserved1; 425 __le64 l_reserved2; /* Pad to 426 sizeof(ocfs2_extent_rec) */ 427 /*10*/ struct ocfs2_extent_rec l_recs[0]; /* Extent records */ 428 }; 429 430 /* 431 * On disk allocation chain list for OCFS2. Note that this is 432 * contained inside ocfs2_dinode, so the offsets are relative to 433 * ocfs2_dinode.id2.i_chain. 434 */ 435 struct ocfs2_chain_list { 436 /*00*/ __le16 cl_cpg; /* Clusters per Block Group */ 437 __le16 cl_bpc; /* Bits per cluster */ 438 __le16 cl_count; /* Total chains in this list */ 439 __le16 cl_next_free_rec; /* Next unused chain slot */ 440 __le64 cl_reserved1; 441 /*10*/ struct ocfs2_chain_rec cl_recs[0]; /* Chain records */ 442 }; 443 444 /* 445 * On disk deallocation log for OCFS2. Note that this is 446 * contained inside ocfs2_dinode, so the offsets are relative to 447 * ocfs2_dinode.id2.i_dealloc. 448 */ 449 struct ocfs2_truncate_log { 450 /*00*/ __le16 tl_count; /* Total records in this log */ 451 __le16 tl_used; /* Number of records in use */ 452 __le32 tl_reserved1; 453 /*08*/ struct ocfs2_truncate_rec tl_recs[0]; /* Truncate records */ 454 }; 455 456 /* 457 * On disk extent block (indirect block) for OCFS2 458 */ 459 struct ocfs2_extent_block 460 { 461 /*00*/ __u8 h_signature[8]; /* Signature for verification */ 462 __le64 h_reserved1; 463 /*10*/ __le16 h_suballoc_slot; /* Slot suballocator this 464 extent_header belongs to */ 465 __le16 h_suballoc_bit; /* Bit offset in suballocator 466 block group */ 467 __le32 h_fs_generation; /* Must match super block */ 468 __le64 h_blkno; /* Offset on disk, in blocks */ 469 /*20*/ __le64 h_reserved3; 470 __le64 h_next_leaf_blk; /* Offset on disk, in blocks, 471 of next leaf header pointing 472 to data */ 473 /*30*/ struct ocfs2_extent_list h_list; /* Extent record list */ 474 /* Actual on-disk size is one block */ 475 }; 476 477 /* 478 * On disk superblock for OCFS2 479 * Note that it is contained inside an ocfs2_dinode, so all offsets 480 * are relative to the start of ocfs2_dinode.id2. 481 */ 482 struct ocfs2_super_block { 483 /*00*/ __le16 s_major_rev_level; 484 __le16 s_minor_rev_level; 485 __le16 s_mnt_count; 486 __le16 s_max_mnt_count; 487 __le16 s_state; /* File system state */ 488 __le16 s_errors; /* Behaviour when detecting errors */ 489 __le32 s_checkinterval; /* Max time between checks */ 490 /*10*/ __le64 s_lastcheck; /* Time of last check */ 491 __le32 s_creator_os; /* OS */ 492 __le32 s_feature_compat; /* Compatible feature set */ 493 /*20*/ __le32 s_feature_incompat; /* Incompatible feature set */ 494 __le32 s_feature_ro_compat; /* Readonly-compatible feature set */ 495 __le64 s_root_blkno; /* Offset, in blocks, of root directory 496 dinode */ 497 /*30*/ __le64 s_system_dir_blkno; /* Offset, in blocks, of system 498 directory dinode */ 499 __le32 s_blocksize_bits; /* Blocksize for this fs */ 500 __le32 s_clustersize_bits; /* Clustersize for this fs */ 501 /*40*/ __le16 s_max_slots; /* Max number of simultaneous mounts 502 before tunefs required */ 503 __le16 s_tunefs_flag; 504 __le32 s_reserved1; 505 __le64 s_first_cluster_group; /* Block offset of 1st cluster 506 * group header */ 507 /*50*/ __u8 s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */ 508 /*90*/ __u8 s_uuid[OCFS2_VOL_UUID_LEN]; /* 128-bit uuid */ 509 /*A0*/ 510 }; 511 512 /* 513 * Local allocation bitmap for OCFS2 slots 514 * Note that it exists inside an ocfs2_dinode, so all offsets are 515 * relative to the start of ocfs2_dinode.id2. 516 */ 517 struct ocfs2_local_alloc 518 { 519 /*00*/ __le32 la_bm_off; /* Starting bit offset in main bitmap */ 520 __le16 la_size; /* Size of included bitmap, in bytes */ 521 __le16 la_reserved1; 522 __le64 la_reserved2; 523 /*10*/ __u8 la_bitmap[0]; 524 }; 525 526 /* 527 * Data-in-inode header. This is only used if i_dyn_features has 528 * OCFS2_INLINE_DATA_FL set. 529 */ 530 struct ocfs2_inline_data 531 { 532 /*00*/ __le16 id_count; /* Number of bytes that can be used 533 * for data, starting at id_data */ 534 __le16 id_reserved0; 535 __le32 id_reserved1; 536 __u8 id_data[0]; /* Start of user data */ 537 }; 538 539 /* 540 * On disk inode for OCFS2 541 */ 542 struct ocfs2_dinode { 543 /*00*/ __u8 i_signature[8]; /* Signature for validation */ 544 __le32 i_generation; /* Generation number */ 545 __le16 i_suballoc_slot; /* Slot suballocator this inode 546 belongs to */ 547 __le16 i_suballoc_bit; /* Bit offset in suballocator 548 block group */ 549 /*10*/ __le32 i_reserved0; 550 __le32 i_clusters; /* Cluster count */ 551 __le32 i_uid; /* Owner UID */ 552 __le32 i_gid; /* Owning GID */ 553 /*20*/ __le64 i_size; /* Size in bytes */ 554 __le16 i_mode; /* File mode */ 555 __le16 i_links_count; /* Links count */ 556 __le32 i_flags; /* File flags */ 557 /*30*/ __le64 i_atime; /* Access time */ 558 __le64 i_ctime; /* Creation time */ 559 /*40*/ __le64 i_mtime; /* Modification time */ 560 __le64 i_dtime; /* Deletion time */ 561 /*50*/ __le64 i_blkno; /* Offset on disk, in blocks */ 562 __le64 i_last_eb_blk; /* Pointer to last extent 563 block */ 564 /*60*/ __le32 i_fs_generation; /* Generation per fs-instance */ 565 __le32 i_atime_nsec; 566 __le32 i_ctime_nsec; 567 __le32 i_mtime_nsec; 568 __le32 i_attr; 569 __le16 i_orphaned_slot; /* Only valid when OCFS2_ORPHANED_FL 570 was set in i_flags */ 571 __le16 i_dyn_features; 572 /*70*/ __le64 i_reserved2[8]; 573 /*B8*/ union { 574 __le64 i_pad1; /* Generic way to refer to this 575 64bit union */ 576 struct { 577 __le64 i_rdev; /* Device number */ 578 } dev1; 579 struct { /* Info for bitmap system 580 inodes */ 581 __le32 i_used; /* Bits (ie, clusters) used */ 582 __le32 i_total; /* Total bits (clusters) 583 available */ 584 } bitmap1; 585 struct { /* Info for journal system 586 inodes */ 587 __le32 ij_flags; /* Mounted, version, etc. */ 588 __le32 ij_pad; 589 } journal1; 590 } id1; /* Inode type dependant 1 */ 591 /*C0*/ union { 592 struct ocfs2_super_block i_super; 593 struct ocfs2_local_alloc i_lab; 594 struct ocfs2_chain_list i_chain; 595 struct ocfs2_extent_list i_list; 596 struct ocfs2_truncate_log i_dealloc; 597 struct ocfs2_inline_data i_data; 598 __u8 i_symlink[0]; 599 } id2; 600 /* Actual on-disk size is one block */ 601 }; 602 603 /* 604 * On-disk directory entry structure for OCFS2 605 * 606 * Packed as this structure could be accessed unaligned on 64-bit platforms 607 */ 608 struct ocfs2_dir_entry { 609 /*00*/ __le64 inode; /* Inode number */ 610 __le16 rec_len; /* Directory entry length */ 611 __u8 name_len; /* Name length */ 612 __u8 file_type; 613 /*0C*/ char name[OCFS2_MAX_FILENAME_LEN]; /* File name */ 614 /* Actual on-disk length specified by rec_len */ 615 } __attribute__ ((packed)); 616 617 /* 618 * On disk allocator group structure for OCFS2 619 */ 620 struct ocfs2_group_desc 621 { 622 /*00*/ __u8 bg_signature[8]; /* Signature for validation */ 623 __le16 bg_size; /* Size of included bitmap in 624 bytes. */ 625 __le16 bg_bits; /* Bits represented by this 626 group. */ 627 __le16 bg_free_bits_count; /* Free bits count */ 628 __le16 bg_chain; /* What chain I am in. */ 629 /*10*/ __le32 bg_generation; 630 __le32 bg_reserved1; 631 __le64 bg_next_group; /* Next group in my list, in 632 blocks */ 633 /*20*/ __le64 bg_parent_dinode; /* dinode which owns me, in 634 blocks */ 635 __le64 bg_blkno; /* Offset on disk, in blocks */ 636 /*30*/ __le64 bg_reserved2[2]; 637 /*40*/ __u8 bg_bitmap[0]; 638 }; 639 640 #ifdef __KERNEL__ 641 static inline int ocfs2_fast_symlink_chars(struct super_block *sb) 642 { 643 return sb->s_blocksize - 644 offsetof(struct ocfs2_dinode, id2.i_symlink); 645 } 646 647 static inline int ocfs2_max_inline_data(struct super_block *sb) 648 { 649 return sb->s_blocksize - 650 offsetof(struct ocfs2_dinode, id2.i_data.id_data); 651 } 652 653 static inline int ocfs2_extent_recs_per_inode(struct super_block *sb) 654 { 655 int size; 656 657 size = sb->s_blocksize - 658 offsetof(struct ocfs2_dinode, id2.i_list.l_recs); 659 660 return size / sizeof(struct ocfs2_extent_rec); 661 } 662 663 static inline int ocfs2_chain_recs_per_inode(struct super_block *sb) 664 { 665 int size; 666 667 size = sb->s_blocksize - 668 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs); 669 670 return size / sizeof(struct ocfs2_chain_rec); 671 } 672 673 static inline u16 ocfs2_extent_recs_per_eb(struct super_block *sb) 674 { 675 int size; 676 677 size = sb->s_blocksize - 678 offsetof(struct ocfs2_extent_block, h_list.l_recs); 679 680 return size / sizeof(struct ocfs2_extent_rec); 681 } 682 683 static inline u16 ocfs2_local_alloc_size(struct super_block *sb) 684 { 685 u16 size; 686 687 size = sb->s_blocksize - 688 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap); 689 690 return size; 691 } 692 693 static inline int ocfs2_group_bitmap_size(struct super_block *sb) 694 { 695 int size; 696 697 size = sb->s_blocksize - 698 offsetof(struct ocfs2_group_desc, bg_bitmap); 699 700 return size; 701 } 702 703 static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb) 704 { 705 int size; 706 707 size = sb->s_blocksize - 708 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs); 709 710 return size / sizeof(struct ocfs2_truncate_rec); 711 } 712 713 static inline u64 ocfs2_backup_super_blkno(struct super_block *sb, int index) 714 { 715 u64 offset = OCFS2_BACKUP_SB_START; 716 717 if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) { 718 offset <<= (2 * index); 719 offset >>= sb->s_blocksize_bits; 720 return offset; 721 } 722 723 return 0; 724 725 } 726 #else 727 static inline int ocfs2_fast_symlink_chars(int blocksize) 728 { 729 return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink); 730 } 731 732 static inline int ocfs2_max_inline_data(int blocksize) 733 { 734 return blocksize - offsetof(struct ocfs2_dinode, id2.i_data.id_data); 735 } 736 737 static inline int ocfs2_extent_recs_per_inode(int blocksize) 738 { 739 int size; 740 741 size = blocksize - 742 offsetof(struct ocfs2_dinode, id2.i_list.l_recs); 743 744 return size / sizeof(struct ocfs2_extent_rec); 745 } 746 747 static inline int ocfs2_chain_recs_per_inode(int blocksize) 748 { 749 int size; 750 751 size = blocksize - 752 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs); 753 754 return size / sizeof(struct ocfs2_chain_rec); 755 } 756 757 static inline int ocfs2_extent_recs_per_eb(int blocksize) 758 { 759 int size; 760 761 size = blocksize - 762 offsetof(struct ocfs2_extent_block, h_list.l_recs); 763 764 return size / sizeof(struct ocfs2_extent_rec); 765 } 766 767 static inline int ocfs2_local_alloc_size(int blocksize) 768 { 769 int size; 770 771 size = blocksize - 772 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap); 773 774 return size; 775 } 776 777 static inline int ocfs2_group_bitmap_size(int blocksize) 778 { 779 int size; 780 781 size = blocksize - 782 offsetof(struct ocfs2_group_desc, bg_bitmap); 783 784 return size; 785 } 786 787 static inline int ocfs2_truncate_recs_per_inode(int blocksize) 788 { 789 int size; 790 791 size = blocksize - 792 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs); 793 794 return size / sizeof(struct ocfs2_truncate_rec); 795 } 796 797 static inline uint64_t ocfs2_backup_super_blkno(int blocksize, int index) 798 { 799 uint64_t offset = OCFS2_BACKUP_SB_START; 800 801 if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) { 802 offset <<= (2 * index); 803 offset /= blocksize; 804 return offset; 805 } 806 807 return 0; 808 } 809 #endif /* __KERNEL__ */ 810 811 812 static inline int ocfs2_system_inode_is_global(int type) 813 { 814 return ((type >= 0) && 815 (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE)); 816 } 817 818 static inline int ocfs2_sprintf_system_inode_name(char *buf, int len, 819 int type, int slot) 820 { 821 int chars; 822 823 /* 824 * Global system inodes can only have one copy. Everything 825 * after OCFS2_LAST_GLOBAL_SYSTEM_INODE in the system inode 826 * list has a copy per slot. 827 */ 828 if (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE) 829 chars = snprintf(buf, len, 830 ocfs2_system_inodes[type].si_name); 831 else 832 chars = snprintf(buf, len, 833 ocfs2_system_inodes[type].si_name, 834 slot); 835 836 return chars; 837 } 838 839 static inline void ocfs2_set_de_type(struct ocfs2_dir_entry *de, 840 umode_t mode) 841 { 842 de->file_type = ocfs2_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 843 } 844 845 #endif /* _OCFS2_FS_H */ 846 847