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 /* 235 * Journal Flags (ocfs2_dinode.id1.journal1.i_flags) 236 */ 237 #define OCFS2_JOURNAL_DIRTY_FL (0x00000001) /* Journal needs recovery */ 238 239 /* 240 * superblock s_state flags 241 */ 242 #define OCFS2_ERROR_FS (0x00000001) /* FS saw errors */ 243 244 /* Limit of space in ocfs2_dir_entry */ 245 #define OCFS2_MAX_FILENAME_LEN 255 246 247 /* Maximum slots on an ocfs2 file system */ 248 #define OCFS2_MAX_SLOTS 255 249 250 /* Slot map indicator for an empty slot */ 251 #define OCFS2_INVALID_SLOT -1 252 253 #define OCFS2_VOL_UUID_LEN 16 254 #define OCFS2_MAX_VOL_LABEL_LEN 64 255 256 /* Journal limits (in bytes) */ 257 #define OCFS2_MIN_JOURNAL_SIZE (4 * 1024 * 1024) 258 259 struct ocfs2_system_inode_info { 260 char *si_name; 261 int si_iflags; 262 int si_mode; 263 }; 264 265 /* System file index */ 266 enum { 267 BAD_BLOCK_SYSTEM_INODE = 0, 268 GLOBAL_INODE_ALLOC_SYSTEM_INODE, 269 SLOT_MAP_SYSTEM_INODE, 270 #define OCFS2_FIRST_ONLINE_SYSTEM_INODE SLOT_MAP_SYSTEM_INODE 271 HEARTBEAT_SYSTEM_INODE, 272 GLOBAL_BITMAP_SYSTEM_INODE, 273 #define OCFS2_LAST_GLOBAL_SYSTEM_INODE GLOBAL_BITMAP_SYSTEM_INODE 274 ORPHAN_DIR_SYSTEM_INODE, 275 EXTENT_ALLOC_SYSTEM_INODE, 276 INODE_ALLOC_SYSTEM_INODE, 277 JOURNAL_SYSTEM_INODE, 278 LOCAL_ALLOC_SYSTEM_INODE, 279 TRUNCATE_LOG_SYSTEM_INODE, 280 NUM_SYSTEM_INODES 281 }; 282 283 static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = { 284 /* Global system inodes (single copy) */ 285 /* The first two are only used from userspace mfks/tunefs */ 286 [BAD_BLOCK_SYSTEM_INODE] = { "bad_blocks", 0, S_IFREG | 0644 }, 287 [GLOBAL_INODE_ALLOC_SYSTEM_INODE] = { "global_inode_alloc", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, 288 289 /* These are used by the running filesystem */ 290 [SLOT_MAP_SYSTEM_INODE] = { "slot_map", 0, S_IFREG | 0644 }, 291 [HEARTBEAT_SYSTEM_INODE] = { "heartbeat", OCFS2_HEARTBEAT_FL, S_IFREG | 0644 }, 292 [GLOBAL_BITMAP_SYSTEM_INODE] = { "global_bitmap", 0, S_IFREG | 0644 }, 293 294 /* Slot-specific system inodes (one copy per slot) */ 295 [ORPHAN_DIR_SYSTEM_INODE] = { "orphan_dir:%04d", 0, S_IFDIR | 0755 }, 296 [EXTENT_ALLOC_SYSTEM_INODE] = { "extent_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, 297 [INODE_ALLOC_SYSTEM_INODE] = { "inode_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, 298 [JOURNAL_SYSTEM_INODE] = { "journal:%04d", OCFS2_JOURNAL_FL, S_IFREG | 0644 }, 299 [LOCAL_ALLOC_SYSTEM_INODE] = { "local_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_LOCAL_ALLOC_FL, S_IFREG | 0644 }, 300 [TRUNCATE_LOG_SYSTEM_INODE] = { "truncate_log:%04d", OCFS2_DEALLOC_FL, S_IFREG | 0644 } 301 }; 302 303 /* Parameter passed from mount.ocfs2 to module */ 304 #define OCFS2_HB_NONE "heartbeat=none" 305 #define OCFS2_HB_LOCAL "heartbeat=local" 306 307 /* 308 * OCFS2 directory file types. Only the low 3 bits are used. The 309 * other bits are reserved for now. 310 */ 311 #define OCFS2_FT_UNKNOWN 0 312 #define OCFS2_FT_REG_FILE 1 313 #define OCFS2_FT_DIR 2 314 #define OCFS2_FT_CHRDEV 3 315 #define OCFS2_FT_BLKDEV 4 316 #define OCFS2_FT_FIFO 5 317 #define OCFS2_FT_SOCK 6 318 #define OCFS2_FT_SYMLINK 7 319 320 #define OCFS2_FT_MAX 8 321 322 /* 323 * OCFS2_DIR_PAD defines the directory entries boundaries 324 * 325 * NOTE: It must be a multiple of 4 326 */ 327 #define OCFS2_DIR_PAD 4 328 #define OCFS2_DIR_ROUND (OCFS2_DIR_PAD - 1) 329 #define OCFS2_DIR_MEMBER_LEN offsetof(struct ocfs2_dir_entry, name) 330 #define OCFS2_DIR_REC_LEN(name_len) (((name_len) + OCFS2_DIR_MEMBER_LEN + \ 331 OCFS2_DIR_ROUND) & \ 332 ~OCFS2_DIR_ROUND) 333 334 #define OCFS2_LINK_MAX 32000 335 336 #define S_SHIFT 12 337 static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = { 338 [S_IFREG >> S_SHIFT] = OCFS2_FT_REG_FILE, 339 [S_IFDIR >> S_SHIFT] = OCFS2_FT_DIR, 340 [S_IFCHR >> S_SHIFT] = OCFS2_FT_CHRDEV, 341 [S_IFBLK >> S_SHIFT] = OCFS2_FT_BLKDEV, 342 [S_IFIFO >> S_SHIFT] = OCFS2_FT_FIFO, 343 [S_IFSOCK >> S_SHIFT] = OCFS2_FT_SOCK, 344 [S_IFLNK >> S_SHIFT] = OCFS2_FT_SYMLINK, 345 }; 346 347 348 /* 349 * Convenience casts 350 */ 351 #define OCFS2_RAW_SB(dinode) (&((dinode)->id2.i_super)) 352 353 /* 354 * On disk extent record for OCFS2 355 * It describes a range of clusters on disk. 356 * 357 * Length fields are divided into interior and leaf node versions. 358 * This leaves room for a flags field (OCFS2_EXT_*) in the leaf nodes. 359 */ 360 struct ocfs2_extent_rec { 361 /*00*/ __le32 e_cpos; /* Offset into the file, in clusters */ 362 union { 363 __le32 e_int_clusters; /* Clusters covered by all children */ 364 struct { 365 __le16 e_leaf_clusters; /* Clusters covered by this 366 extent */ 367 __u8 e_reserved1; 368 __u8 e_flags; /* Extent flags */ 369 }; 370 }; 371 __le64 e_blkno; /* Physical disk offset, in blocks */ 372 /*10*/ 373 }; 374 375 struct ocfs2_chain_rec { 376 __le32 c_free; /* Number of free bits in this chain. */ 377 __le32 c_total; /* Number of total bits in this chain */ 378 __le64 c_blkno; /* Physical disk offset (blocks) of 1st group */ 379 }; 380 381 struct ocfs2_truncate_rec { 382 __le32 t_start; /* 1st cluster in this log */ 383 __le32 t_clusters; /* Number of total clusters covered */ 384 }; 385 386 /* 387 * On disk extent list for OCFS2 (node in the tree). Note that this 388 * is contained inside ocfs2_dinode or ocfs2_extent_block, so the 389 * offsets are relative to ocfs2_dinode.id2.i_list or 390 * ocfs2_extent_block.h_list, respectively. 391 */ 392 struct ocfs2_extent_list { 393 /*00*/ __le16 l_tree_depth; /* Extent tree depth from this 394 point. 0 means data extents 395 hang directly off this 396 header (a leaf) 397 NOTE: The high 8 bits cannot be 398 used - tree_depth is never that big. 399 */ 400 __le16 l_count; /* Number of extent records */ 401 __le16 l_next_free_rec; /* Next unused extent slot */ 402 __le16 l_reserved1; 403 __le64 l_reserved2; /* Pad to 404 sizeof(ocfs2_extent_rec) */ 405 /*10*/ struct ocfs2_extent_rec l_recs[0]; /* Extent records */ 406 }; 407 408 /* 409 * On disk allocation chain list for OCFS2. Note that this is 410 * contained inside ocfs2_dinode, so the offsets are relative to 411 * ocfs2_dinode.id2.i_chain. 412 */ 413 struct ocfs2_chain_list { 414 /*00*/ __le16 cl_cpg; /* Clusters per Block Group */ 415 __le16 cl_bpc; /* Bits per cluster */ 416 __le16 cl_count; /* Total chains in this list */ 417 __le16 cl_next_free_rec; /* Next unused chain slot */ 418 __le64 cl_reserved1; 419 /*10*/ struct ocfs2_chain_rec cl_recs[0]; /* Chain records */ 420 }; 421 422 /* 423 * On disk deallocation log for OCFS2. Note that this is 424 * contained inside ocfs2_dinode, so the offsets are relative to 425 * ocfs2_dinode.id2.i_dealloc. 426 */ 427 struct ocfs2_truncate_log { 428 /*00*/ __le16 tl_count; /* Total records in this log */ 429 __le16 tl_used; /* Number of records in use */ 430 __le32 tl_reserved1; 431 /*08*/ struct ocfs2_truncate_rec tl_recs[0]; /* Truncate records */ 432 }; 433 434 /* 435 * On disk extent block (indirect block) for OCFS2 436 */ 437 struct ocfs2_extent_block 438 { 439 /*00*/ __u8 h_signature[8]; /* Signature for verification */ 440 __le64 h_reserved1; 441 /*10*/ __le16 h_suballoc_slot; /* Slot suballocator this 442 extent_header belongs to */ 443 __le16 h_suballoc_bit; /* Bit offset in suballocator 444 block group */ 445 __le32 h_fs_generation; /* Must match super block */ 446 __le64 h_blkno; /* Offset on disk, in blocks */ 447 /*20*/ __le64 h_reserved3; 448 __le64 h_next_leaf_blk; /* Offset on disk, in blocks, 449 of next leaf header pointing 450 to data */ 451 /*30*/ struct ocfs2_extent_list h_list; /* Extent record list */ 452 /* Actual on-disk size is one block */ 453 }; 454 455 /* 456 * On disk superblock for OCFS2 457 * Note that it is contained inside an ocfs2_dinode, so all offsets 458 * are relative to the start of ocfs2_dinode.id2. 459 */ 460 struct ocfs2_super_block { 461 /*00*/ __le16 s_major_rev_level; 462 __le16 s_minor_rev_level; 463 __le16 s_mnt_count; 464 __le16 s_max_mnt_count; 465 __le16 s_state; /* File system state */ 466 __le16 s_errors; /* Behaviour when detecting errors */ 467 __le32 s_checkinterval; /* Max time between checks */ 468 /*10*/ __le64 s_lastcheck; /* Time of last check */ 469 __le32 s_creator_os; /* OS */ 470 __le32 s_feature_compat; /* Compatible feature set */ 471 /*20*/ __le32 s_feature_incompat; /* Incompatible feature set */ 472 __le32 s_feature_ro_compat; /* Readonly-compatible feature set */ 473 __le64 s_root_blkno; /* Offset, in blocks, of root directory 474 dinode */ 475 /*30*/ __le64 s_system_dir_blkno; /* Offset, in blocks, of system 476 directory dinode */ 477 __le32 s_blocksize_bits; /* Blocksize for this fs */ 478 __le32 s_clustersize_bits; /* Clustersize for this fs */ 479 /*40*/ __le16 s_max_slots; /* Max number of simultaneous mounts 480 before tunefs required */ 481 __le16 s_tunefs_flag; 482 __le32 s_reserved1; 483 __le64 s_first_cluster_group; /* Block offset of 1st cluster 484 * group header */ 485 /*50*/ __u8 s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */ 486 /*90*/ __u8 s_uuid[OCFS2_VOL_UUID_LEN]; /* 128-bit uuid */ 487 /*A0*/ 488 }; 489 490 /* 491 * Local allocation bitmap for OCFS2 slots 492 * Note that it exists inside an ocfs2_dinode, so all offsets are 493 * relative to the start of ocfs2_dinode.id2. 494 */ 495 struct ocfs2_local_alloc 496 { 497 /*00*/ __le32 la_bm_off; /* Starting bit offset in main bitmap */ 498 __le16 la_size; /* Size of included bitmap, in bytes */ 499 __le16 la_reserved1; 500 __le64 la_reserved2; 501 /*10*/ __u8 la_bitmap[0]; 502 }; 503 504 /* 505 * Data-in-inode header. This is only used if i_dyn_features has 506 * OCFS2_INLINE_DATA_FL set. 507 */ 508 struct ocfs2_inline_data 509 { 510 /*00*/ __le16 id_count; /* Number of bytes that can be used 511 * for data, starting at id_data */ 512 __le16 id_reserved0; 513 __le32 id_reserved1; 514 __u8 id_data[0]; /* Start of user data */ 515 }; 516 517 /* 518 * On disk inode for OCFS2 519 */ 520 struct ocfs2_dinode { 521 /*00*/ __u8 i_signature[8]; /* Signature for validation */ 522 __le32 i_generation; /* Generation number */ 523 __le16 i_suballoc_slot; /* Slot suballocator this inode 524 belongs to */ 525 __le16 i_suballoc_bit; /* Bit offset in suballocator 526 block group */ 527 /*10*/ __le32 i_reserved0; 528 __le32 i_clusters; /* Cluster count */ 529 __le32 i_uid; /* Owner UID */ 530 __le32 i_gid; /* Owning GID */ 531 /*20*/ __le64 i_size; /* Size in bytes */ 532 __le16 i_mode; /* File mode */ 533 __le16 i_links_count; /* Links count */ 534 __le32 i_flags; /* File flags */ 535 /*30*/ __le64 i_atime; /* Access time */ 536 __le64 i_ctime; /* Creation time */ 537 /*40*/ __le64 i_mtime; /* Modification time */ 538 __le64 i_dtime; /* Deletion time */ 539 /*50*/ __le64 i_blkno; /* Offset on disk, in blocks */ 540 __le64 i_last_eb_blk; /* Pointer to last extent 541 block */ 542 /*60*/ __le32 i_fs_generation; /* Generation per fs-instance */ 543 __le32 i_atime_nsec; 544 __le32 i_ctime_nsec; 545 __le32 i_mtime_nsec; 546 __le32 i_attr; 547 __le16 i_orphaned_slot; /* Only valid when OCFS2_ORPHANED_FL 548 was set in i_flags */ 549 __le16 i_dyn_features; 550 /*70*/ __le64 i_reserved2[8]; 551 /*B8*/ union { 552 __le64 i_pad1; /* Generic way to refer to this 553 64bit union */ 554 struct { 555 __le64 i_rdev; /* Device number */ 556 } dev1; 557 struct { /* Info for bitmap system 558 inodes */ 559 __le32 i_used; /* Bits (ie, clusters) used */ 560 __le32 i_total; /* Total bits (clusters) 561 available */ 562 } bitmap1; 563 struct { /* Info for journal system 564 inodes */ 565 __le32 ij_flags; /* Mounted, version, etc. */ 566 __le32 ij_pad; 567 } journal1; 568 } id1; /* Inode type dependant 1 */ 569 /*C0*/ union { 570 struct ocfs2_super_block i_super; 571 struct ocfs2_local_alloc i_lab; 572 struct ocfs2_chain_list i_chain; 573 struct ocfs2_extent_list i_list; 574 struct ocfs2_truncate_log i_dealloc; 575 struct ocfs2_inline_data i_data; 576 __u8 i_symlink[0]; 577 } id2; 578 /* Actual on-disk size is one block */ 579 }; 580 581 /* 582 * On-disk directory entry structure for OCFS2 583 * 584 * Packed as this structure could be accessed unaligned on 64-bit platforms 585 */ 586 struct ocfs2_dir_entry { 587 /*00*/ __le64 inode; /* Inode number */ 588 __le16 rec_len; /* Directory entry length */ 589 __u8 name_len; /* Name length */ 590 __u8 file_type; 591 /*0C*/ char name[OCFS2_MAX_FILENAME_LEN]; /* File name */ 592 /* Actual on-disk length specified by rec_len */ 593 } __attribute__ ((packed)); 594 595 /* 596 * On disk allocator group structure for OCFS2 597 */ 598 struct ocfs2_group_desc 599 { 600 /*00*/ __u8 bg_signature[8]; /* Signature for validation */ 601 __le16 bg_size; /* Size of included bitmap in 602 bytes. */ 603 __le16 bg_bits; /* Bits represented by this 604 group. */ 605 __le16 bg_free_bits_count; /* Free bits count */ 606 __le16 bg_chain; /* What chain I am in. */ 607 /*10*/ __le32 bg_generation; 608 __le32 bg_reserved1; 609 __le64 bg_next_group; /* Next group in my list, in 610 blocks */ 611 /*20*/ __le64 bg_parent_dinode; /* dinode which owns me, in 612 blocks */ 613 __le64 bg_blkno; /* Offset on disk, in blocks */ 614 /*30*/ __le64 bg_reserved2[2]; 615 /*40*/ __u8 bg_bitmap[0]; 616 }; 617 618 #ifdef __KERNEL__ 619 static inline int ocfs2_fast_symlink_chars(struct super_block *sb) 620 { 621 return sb->s_blocksize - 622 offsetof(struct ocfs2_dinode, id2.i_symlink); 623 } 624 625 static inline int ocfs2_max_inline_data(struct super_block *sb) 626 { 627 return sb->s_blocksize - 628 offsetof(struct ocfs2_dinode, id2.i_data.id_data); 629 } 630 631 static inline int ocfs2_extent_recs_per_inode(struct super_block *sb) 632 { 633 int size; 634 635 size = sb->s_blocksize - 636 offsetof(struct ocfs2_dinode, id2.i_list.l_recs); 637 638 return size / sizeof(struct ocfs2_extent_rec); 639 } 640 641 static inline int ocfs2_chain_recs_per_inode(struct super_block *sb) 642 { 643 int size; 644 645 size = sb->s_blocksize - 646 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs); 647 648 return size / sizeof(struct ocfs2_chain_rec); 649 } 650 651 static inline u16 ocfs2_extent_recs_per_eb(struct super_block *sb) 652 { 653 int size; 654 655 size = sb->s_blocksize - 656 offsetof(struct ocfs2_extent_block, h_list.l_recs); 657 658 return size / sizeof(struct ocfs2_extent_rec); 659 } 660 661 static inline u16 ocfs2_local_alloc_size(struct super_block *sb) 662 { 663 u16 size; 664 665 size = sb->s_blocksize - 666 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap); 667 668 return size; 669 } 670 671 static inline int ocfs2_group_bitmap_size(struct super_block *sb) 672 { 673 int size; 674 675 size = sb->s_blocksize - 676 offsetof(struct ocfs2_group_desc, bg_bitmap); 677 678 return size; 679 } 680 681 static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb) 682 { 683 int size; 684 685 size = sb->s_blocksize - 686 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs); 687 688 return size / sizeof(struct ocfs2_truncate_rec); 689 } 690 691 static inline u64 ocfs2_backup_super_blkno(struct super_block *sb, int index) 692 { 693 u64 offset = OCFS2_BACKUP_SB_START; 694 695 if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) { 696 offset <<= (2 * index); 697 offset >>= sb->s_blocksize_bits; 698 return offset; 699 } 700 701 return 0; 702 703 } 704 #else 705 static inline int ocfs2_fast_symlink_chars(int blocksize) 706 { 707 return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink); 708 } 709 710 static inline int ocfs2_max_inline_data(int blocksize) 711 { 712 return blocksize - offsetof(struct ocfs2_dinode, id2.i_data.id_data); 713 } 714 715 static inline int ocfs2_extent_recs_per_inode(int blocksize) 716 { 717 int size; 718 719 size = blocksize - 720 offsetof(struct ocfs2_dinode, id2.i_list.l_recs); 721 722 return size / sizeof(struct ocfs2_extent_rec); 723 } 724 725 static inline int ocfs2_chain_recs_per_inode(int blocksize) 726 { 727 int size; 728 729 size = blocksize - 730 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs); 731 732 return size / sizeof(struct ocfs2_chain_rec); 733 } 734 735 static inline int ocfs2_extent_recs_per_eb(int blocksize) 736 { 737 int size; 738 739 size = blocksize - 740 offsetof(struct ocfs2_extent_block, h_list.l_recs); 741 742 return size / sizeof(struct ocfs2_extent_rec); 743 } 744 745 static inline int ocfs2_local_alloc_size(int blocksize) 746 { 747 int size; 748 749 size = blocksize - 750 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap); 751 752 return size; 753 } 754 755 static inline int ocfs2_group_bitmap_size(int blocksize) 756 { 757 int size; 758 759 size = blocksize - 760 offsetof(struct ocfs2_group_desc, bg_bitmap); 761 762 return size; 763 } 764 765 static inline int ocfs2_truncate_recs_per_inode(int blocksize) 766 { 767 int size; 768 769 size = blocksize - 770 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs); 771 772 return size / sizeof(struct ocfs2_truncate_rec); 773 } 774 775 static inline uint64_t ocfs2_backup_super_blkno(int blocksize, int index) 776 { 777 uint64_t offset = OCFS2_BACKUP_SB_START; 778 779 if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) { 780 offset <<= (2 * index); 781 offset /= blocksize; 782 return offset; 783 } 784 785 return 0; 786 } 787 #endif /* __KERNEL__ */ 788 789 790 static inline int ocfs2_system_inode_is_global(int type) 791 { 792 return ((type >= 0) && 793 (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE)); 794 } 795 796 static inline int ocfs2_sprintf_system_inode_name(char *buf, int len, 797 int type, int slot) 798 { 799 int chars; 800 801 /* 802 * Global system inodes can only have one copy. Everything 803 * after OCFS2_LAST_GLOBAL_SYSTEM_INODE in the system inode 804 * list has a copy per slot. 805 */ 806 if (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE) 807 chars = snprintf(buf, len, 808 ocfs2_system_inodes[type].si_name); 809 else 810 chars = snprintf(buf, len, 811 ocfs2_system_inodes[type].si_name, 812 slot); 813 814 return chars; 815 } 816 817 static inline void ocfs2_set_de_type(struct ocfs2_dir_entry *de, 818 umode_t mode) 819 { 820 de->file_type = ocfs2_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 821 } 822 823 #endif /* _OCFS2_FS_H */ 824 825