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 #define OCFS2_FEATURE_RO_COMPAT_SUPP 0 91 92 /* 93 * Heartbeat-only devices are missing journals and other files. The 94 * filesystem driver can't load them, but the library can. Never put 95 * this in OCFS2_FEATURE_INCOMPAT_SUPP, *ever*. 96 */ 97 #define OCFS2_FEATURE_INCOMPAT_HEARTBEAT_DEV 0x0002 98 99 /* 100 * tunefs sets this incompat flag before starting the resize and clears it 101 * at the end. This flag protects users from inadvertently mounting the fs 102 * after an aborted run without fsck-ing. 103 */ 104 #define OCFS2_FEATURE_INCOMPAT_RESIZE_INPROG 0x0004 105 106 /* Used to denote a non-clustered volume */ 107 #define OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT 0x0008 108 109 /* Support for sparse allocation in b-trees */ 110 #define OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC 0x0010 111 112 /* 113 * backup superblock flag is used to indicate that this volume 114 * has backup superblocks. 115 */ 116 #define OCFS2_FEATURE_COMPAT_BACKUP_SB 0x0001 117 118 /* The byte offset of the first backup block will be 1G. 119 * The following will be 4G, 16G, 64G, 256G and 1T. 120 */ 121 #define OCFS2_BACKUP_SB_START 1 << 30 122 123 /* the max backup superblock nums */ 124 #define OCFS2_MAX_BACKUP_SUPERBLOCKS 6 125 126 /* 127 * Flags on ocfs2_dinode.i_flags 128 */ 129 #define OCFS2_VALID_FL (0x00000001) /* Inode is valid */ 130 #define OCFS2_UNUSED2_FL (0x00000002) 131 #define OCFS2_ORPHANED_FL (0x00000004) /* On the orphan list */ 132 #define OCFS2_UNUSED3_FL (0x00000008) 133 /* System inode flags */ 134 #define OCFS2_SYSTEM_FL (0x00000010) /* System inode */ 135 #define OCFS2_SUPER_BLOCK_FL (0x00000020) /* Super block */ 136 #define OCFS2_LOCAL_ALLOC_FL (0x00000040) /* Slot local alloc bitmap */ 137 #define OCFS2_BITMAP_FL (0x00000080) /* Allocation bitmap */ 138 #define OCFS2_JOURNAL_FL (0x00000100) /* Slot local journal */ 139 #define OCFS2_HEARTBEAT_FL (0x00000200) /* Heartbeat area */ 140 #define OCFS2_CHAIN_FL (0x00000400) /* Chain allocator */ 141 #define OCFS2_DEALLOC_FL (0x00000800) /* Truncate log */ 142 143 /* Inode attributes, keep in sync with EXT2 */ 144 #define OCFS2_SECRM_FL (0x00000001) /* Secure deletion */ 145 #define OCFS2_UNRM_FL (0x00000002) /* Undelete */ 146 #define OCFS2_COMPR_FL (0x00000004) /* Compress file */ 147 #define OCFS2_SYNC_FL (0x00000008) /* Synchronous updates */ 148 #define OCFS2_IMMUTABLE_FL (0x00000010) /* Immutable file */ 149 #define OCFS2_APPEND_FL (0x00000020) /* writes to file may only append */ 150 #define OCFS2_NODUMP_FL (0x00000040) /* do not dump file */ 151 #define OCFS2_NOATIME_FL (0x00000080) /* do not update atime */ 152 #define OCFS2_DIRSYNC_FL (0x00010000) /* dirsync behaviour (directories only) */ 153 154 #define OCFS2_FL_VISIBLE (0x000100FF) /* User visible flags */ 155 #define OCFS2_FL_MODIFIABLE (0x000100FF) /* User modifiable flags */ 156 157 /* 158 * ioctl commands 159 */ 160 #define OCFS2_IOC_GETFLAGS _IOR('f', 1, long) 161 #define OCFS2_IOC_SETFLAGS _IOW('f', 2, long) 162 163 /* 164 * Journal Flags (ocfs2_dinode.id1.journal1.i_flags) 165 */ 166 #define OCFS2_JOURNAL_DIRTY_FL (0x00000001) /* Journal needs recovery */ 167 168 /* 169 * superblock s_state flags 170 */ 171 #define OCFS2_ERROR_FS (0x00000001) /* FS saw errors */ 172 173 /* Limit of space in ocfs2_dir_entry */ 174 #define OCFS2_MAX_FILENAME_LEN 255 175 176 /* Maximum slots on an ocfs2 file system */ 177 #define OCFS2_MAX_SLOTS 255 178 179 /* Slot map indicator for an empty slot */ 180 #define OCFS2_INVALID_SLOT -1 181 182 #define OCFS2_VOL_UUID_LEN 16 183 #define OCFS2_MAX_VOL_LABEL_LEN 64 184 185 /* Journal limits (in bytes) */ 186 #define OCFS2_MIN_JOURNAL_SIZE (4 * 1024 * 1024) 187 188 struct ocfs2_system_inode_info { 189 char *si_name; 190 int si_iflags; 191 int si_mode; 192 }; 193 194 /* System file index */ 195 enum { 196 BAD_BLOCK_SYSTEM_INODE = 0, 197 GLOBAL_INODE_ALLOC_SYSTEM_INODE, 198 SLOT_MAP_SYSTEM_INODE, 199 #define OCFS2_FIRST_ONLINE_SYSTEM_INODE SLOT_MAP_SYSTEM_INODE 200 HEARTBEAT_SYSTEM_INODE, 201 GLOBAL_BITMAP_SYSTEM_INODE, 202 #define OCFS2_LAST_GLOBAL_SYSTEM_INODE GLOBAL_BITMAP_SYSTEM_INODE 203 ORPHAN_DIR_SYSTEM_INODE, 204 EXTENT_ALLOC_SYSTEM_INODE, 205 INODE_ALLOC_SYSTEM_INODE, 206 JOURNAL_SYSTEM_INODE, 207 LOCAL_ALLOC_SYSTEM_INODE, 208 TRUNCATE_LOG_SYSTEM_INODE, 209 NUM_SYSTEM_INODES 210 }; 211 212 static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = { 213 /* Global system inodes (single copy) */ 214 /* The first two are only used from userspace mfks/tunefs */ 215 [BAD_BLOCK_SYSTEM_INODE] = { "bad_blocks", 0, S_IFREG | 0644 }, 216 [GLOBAL_INODE_ALLOC_SYSTEM_INODE] = { "global_inode_alloc", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, 217 218 /* These are used by the running filesystem */ 219 [SLOT_MAP_SYSTEM_INODE] = { "slot_map", 0, S_IFREG | 0644 }, 220 [HEARTBEAT_SYSTEM_INODE] = { "heartbeat", OCFS2_HEARTBEAT_FL, S_IFREG | 0644 }, 221 [GLOBAL_BITMAP_SYSTEM_INODE] = { "global_bitmap", 0, S_IFREG | 0644 }, 222 223 /* Slot-specific system inodes (one copy per slot) */ 224 [ORPHAN_DIR_SYSTEM_INODE] = { "orphan_dir:%04d", 0, S_IFDIR | 0755 }, 225 [EXTENT_ALLOC_SYSTEM_INODE] = { "extent_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, 226 [INODE_ALLOC_SYSTEM_INODE] = { "inode_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, 227 [JOURNAL_SYSTEM_INODE] = { "journal:%04d", OCFS2_JOURNAL_FL, S_IFREG | 0644 }, 228 [LOCAL_ALLOC_SYSTEM_INODE] = { "local_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_LOCAL_ALLOC_FL, S_IFREG | 0644 }, 229 [TRUNCATE_LOG_SYSTEM_INODE] = { "truncate_log:%04d", OCFS2_DEALLOC_FL, S_IFREG | 0644 } 230 }; 231 232 /* Parameter passed from mount.ocfs2 to module */ 233 #define OCFS2_HB_NONE "heartbeat=none" 234 #define OCFS2_HB_LOCAL "heartbeat=local" 235 236 /* 237 * OCFS2 directory file types. Only the low 3 bits are used. The 238 * other bits are reserved for now. 239 */ 240 #define OCFS2_FT_UNKNOWN 0 241 #define OCFS2_FT_REG_FILE 1 242 #define OCFS2_FT_DIR 2 243 #define OCFS2_FT_CHRDEV 3 244 #define OCFS2_FT_BLKDEV 4 245 #define OCFS2_FT_FIFO 5 246 #define OCFS2_FT_SOCK 6 247 #define OCFS2_FT_SYMLINK 7 248 249 #define OCFS2_FT_MAX 8 250 251 /* 252 * OCFS2_DIR_PAD defines the directory entries boundaries 253 * 254 * NOTE: It must be a multiple of 4 255 */ 256 #define OCFS2_DIR_PAD 4 257 #define OCFS2_DIR_ROUND (OCFS2_DIR_PAD - 1) 258 #define OCFS2_DIR_MEMBER_LEN offsetof(struct ocfs2_dir_entry, name) 259 #define OCFS2_DIR_REC_LEN(name_len) (((name_len) + OCFS2_DIR_MEMBER_LEN + \ 260 OCFS2_DIR_ROUND) & \ 261 ~OCFS2_DIR_ROUND) 262 263 #define OCFS2_LINK_MAX 32000 264 265 #define S_SHIFT 12 266 static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = { 267 [S_IFREG >> S_SHIFT] = OCFS2_FT_REG_FILE, 268 [S_IFDIR >> S_SHIFT] = OCFS2_FT_DIR, 269 [S_IFCHR >> S_SHIFT] = OCFS2_FT_CHRDEV, 270 [S_IFBLK >> S_SHIFT] = OCFS2_FT_BLKDEV, 271 [S_IFIFO >> S_SHIFT] = OCFS2_FT_FIFO, 272 [S_IFSOCK >> S_SHIFT] = OCFS2_FT_SOCK, 273 [S_IFLNK >> S_SHIFT] = OCFS2_FT_SYMLINK, 274 }; 275 276 277 /* 278 * Convenience casts 279 */ 280 #define OCFS2_RAW_SB(dinode) (&((dinode)->id2.i_super)) 281 282 /* 283 * On disk extent record for OCFS2 284 * It describes a range of clusters on disk. 285 */ 286 struct ocfs2_extent_rec { 287 /*00*/ __le32 e_cpos; /* Offset into the file, in clusters */ 288 __le32 e_clusters; /* Clusters covered by this extent */ 289 __le64 e_blkno; /* Physical disk offset, in blocks */ 290 /*10*/ 291 }; 292 293 struct ocfs2_chain_rec { 294 __le32 c_free; /* Number of free bits in this chain. */ 295 __le32 c_total; /* Number of total bits in this chain */ 296 __le64 c_blkno; /* Physical disk offset (blocks) of 1st group */ 297 }; 298 299 struct ocfs2_truncate_rec { 300 __le32 t_start; /* 1st cluster in this log */ 301 __le32 t_clusters; /* Number of total clusters covered */ 302 }; 303 304 /* 305 * On disk extent list for OCFS2 (node in the tree). Note that this 306 * is contained inside ocfs2_dinode or ocfs2_extent_block, so the 307 * offsets are relative to ocfs2_dinode.id2.i_list or 308 * ocfs2_extent_block.h_list, respectively. 309 */ 310 struct ocfs2_extent_list { 311 /*00*/ __le16 l_tree_depth; /* Extent tree depth from this 312 point. 0 means data extents 313 hang directly off this 314 header (a leaf) */ 315 __le16 l_count; /* Number of extent records */ 316 __le16 l_next_free_rec; /* Next unused extent slot */ 317 __le16 l_reserved1; 318 __le64 l_reserved2; /* Pad to 319 sizeof(ocfs2_extent_rec) */ 320 /*10*/ struct ocfs2_extent_rec l_recs[0]; /* Extent records */ 321 }; 322 323 /* 324 * On disk allocation chain list for OCFS2. Note that this is 325 * contained inside ocfs2_dinode, so the offsets are relative to 326 * ocfs2_dinode.id2.i_chain. 327 */ 328 struct ocfs2_chain_list { 329 /*00*/ __le16 cl_cpg; /* Clusters per Block Group */ 330 __le16 cl_bpc; /* Bits per cluster */ 331 __le16 cl_count; /* Total chains in this list */ 332 __le16 cl_next_free_rec; /* Next unused chain slot */ 333 __le64 cl_reserved1; 334 /*10*/ struct ocfs2_chain_rec cl_recs[0]; /* Chain records */ 335 }; 336 337 /* 338 * On disk deallocation log for OCFS2. Note that this is 339 * contained inside ocfs2_dinode, so the offsets are relative to 340 * ocfs2_dinode.id2.i_dealloc. 341 */ 342 struct ocfs2_truncate_log { 343 /*00*/ __le16 tl_count; /* Total records in this log */ 344 __le16 tl_used; /* Number of records in use */ 345 __le32 tl_reserved1; 346 /*08*/ struct ocfs2_truncate_rec tl_recs[0]; /* Truncate records */ 347 }; 348 349 /* 350 * On disk extent block (indirect block) for OCFS2 351 */ 352 struct ocfs2_extent_block 353 { 354 /*00*/ __u8 h_signature[8]; /* Signature for verification */ 355 __le64 h_reserved1; 356 /*10*/ __le16 h_suballoc_slot; /* Slot suballocator this 357 extent_header belongs to */ 358 __le16 h_suballoc_bit; /* Bit offset in suballocator 359 block group */ 360 __le32 h_fs_generation; /* Must match super block */ 361 __le64 h_blkno; /* Offset on disk, in blocks */ 362 /*20*/ __le64 h_reserved3; 363 __le64 h_next_leaf_blk; /* Offset on disk, in blocks, 364 of next leaf header pointing 365 to data */ 366 /*30*/ struct ocfs2_extent_list h_list; /* Extent record list */ 367 /* Actual on-disk size is one block */ 368 }; 369 370 /* 371 * On disk superblock for OCFS2 372 * Note that it is contained inside an ocfs2_dinode, so all offsets 373 * are relative to the start of ocfs2_dinode.id2. 374 */ 375 struct ocfs2_super_block { 376 /*00*/ __le16 s_major_rev_level; 377 __le16 s_minor_rev_level; 378 __le16 s_mnt_count; 379 __le16 s_max_mnt_count; 380 __le16 s_state; /* File system state */ 381 __le16 s_errors; /* Behaviour when detecting errors */ 382 __le32 s_checkinterval; /* Max time between checks */ 383 /*10*/ __le64 s_lastcheck; /* Time of last check */ 384 __le32 s_creator_os; /* OS */ 385 __le32 s_feature_compat; /* Compatible feature set */ 386 /*20*/ __le32 s_feature_incompat; /* Incompatible feature set */ 387 __le32 s_feature_ro_compat; /* Readonly-compatible feature set */ 388 __le64 s_root_blkno; /* Offset, in blocks, of root directory 389 dinode */ 390 /*30*/ __le64 s_system_dir_blkno; /* Offset, in blocks, of system 391 directory dinode */ 392 __le32 s_blocksize_bits; /* Blocksize for this fs */ 393 __le32 s_clustersize_bits; /* Clustersize for this fs */ 394 /*40*/ __le16 s_max_slots; /* Max number of simultaneous mounts 395 before tunefs required */ 396 __le16 s_reserved1; 397 __le32 s_reserved2; 398 __le64 s_first_cluster_group; /* Block offset of 1st cluster 399 * group header */ 400 /*50*/ __u8 s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */ 401 /*90*/ __u8 s_uuid[OCFS2_VOL_UUID_LEN]; /* 128-bit uuid */ 402 /*A0*/ 403 }; 404 405 /* 406 * Local allocation bitmap for OCFS2 slots 407 * Note that it exists inside an ocfs2_dinode, so all offsets are 408 * relative to the start of ocfs2_dinode.id2. 409 */ 410 struct ocfs2_local_alloc 411 { 412 /*00*/ __le32 la_bm_off; /* Starting bit offset in main bitmap */ 413 __le16 la_size; /* Size of included bitmap, in bytes */ 414 __le16 la_reserved1; 415 __le64 la_reserved2; 416 /*10*/ __u8 la_bitmap[0]; 417 }; 418 419 /* 420 * On disk inode for OCFS2 421 */ 422 struct ocfs2_dinode { 423 /*00*/ __u8 i_signature[8]; /* Signature for validation */ 424 __le32 i_generation; /* Generation number */ 425 __le16 i_suballoc_slot; /* Slot suballocator this inode 426 belongs to */ 427 __le16 i_suballoc_bit; /* Bit offset in suballocator 428 block group */ 429 /*10*/ __le32 i_reserved0; 430 __le32 i_clusters; /* Cluster count */ 431 __le32 i_uid; /* Owner UID */ 432 __le32 i_gid; /* Owning GID */ 433 /*20*/ __le64 i_size; /* Size in bytes */ 434 __le16 i_mode; /* File mode */ 435 __le16 i_links_count; /* Links count */ 436 __le32 i_flags; /* File flags */ 437 /*30*/ __le64 i_atime; /* Access time */ 438 __le64 i_ctime; /* Creation time */ 439 /*40*/ __le64 i_mtime; /* Modification time */ 440 __le64 i_dtime; /* Deletion time */ 441 /*50*/ __le64 i_blkno; /* Offset on disk, in blocks */ 442 __le64 i_last_eb_blk; /* Pointer to last extent 443 block */ 444 /*60*/ __le32 i_fs_generation; /* Generation per fs-instance */ 445 __le32 i_atime_nsec; 446 __le32 i_ctime_nsec; 447 __le32 i_mtime_nsec; 448 __le32 i_attr; 449 __le32 i_reserved1; 450 /*70*/ __le64 i_reserved2[8]; 451 /*B8*/ union { 452 __le64 i_pad1; /* Generic way to refer to this 453 64bit union */ 454 struct { 455 __le64 i_rdev; /* Device number */ 456 } dev1; 457 struct { /* Info for bitmap system 458 inodes */ 459 __le32 i_used; /* Bits (ie, clusters) used */ 460 __le32 i_total; /* Total bits (clusters) 461 available */ 462 } bitmap1; 463 struct { /* Info for journal system 464 inodes */ 465 __le32 ij_flags; /* Mounted, version, etc. */ 466 __le32 ij_pad; 467 } journal1; 468 } id1; /* Inode type dependant 1 */ 469 /*C0*/ union { 470 struct ocfs2_super_block i_super; 471 struct ocfs2_local_alloc i_lab; 472 struct ocfs2_chain_list i_chain; 473 struct ocfs2_extent_list i_list; 474 struct ocfs2_truncate_log i_dealloc; 475 __u8 i_symlink[0]; 476 } id2; 477 /* Actual on-disk size is one block */ 478 }; 479 480 /* 481 * On-disk directory entry structure for OCFS2 482 * 483 * Packed as this structure could be accessed unaligned on 64-bit platforms 484 */ 485 struct ocfs2_dir_entry { 486 /*00*/ __le64 inode; /* Inode number */ 487 __le16 rec_len; /* Directory entry length */ 488 __u8 name_len; /* Name length */ 489 __u8 file_type; 490 /*0C*/ char name[OCFS2_MAX_FILENAME_LEN]; /* File name */ 491 /* Actual on-disk length specified by rec_len */ 492 } __attribute__ ((packed)); 493 494 /* 495 * On disk allocator group structure for OCFS2 496 */ 497 struct ocfs2_group_desc 498 { 499 /*00*/ __u8 bg_signature[8]; /* Signature for validation */ 500 __le16 bg_size; /* Size of included bitmap in 501 bytes. */ 502 __le16 bg_bits; /* Bits represented by this 503 group. */ 504 __le16 bg_free_bits_count; /* Free bits count */ 505 __le16 bg_chain; /* What chain I am in. */ 506 /*10*/ __le32 bg_generation; 507 __le32 bg_reserved1; 508 __le64 bg_next_group; /* Next group in my list, in 509 blocks */ 510 /*20*/ __le64 bg_parent_dinode; /* dinode which owns me, in 511 blocks */ 512 __le64 bg_blkno; /* Offset on disk, in blocks */ 513 /*30*/ __le64 bg_reserved2[2]; 514 /*40*/ __u8 bg_bitmap[0]; 515 }; 516 517 #ifdef __KERNEL__ 518 static inline int ocfs2_fast_symlink_chars(struct super_block *sb) 519 { 520 return sb->s_blocksize - 521 offsetof(struct ocfs2_dinode, id2.i_symlink); 522 } 523 524 static inline int ocfs2_extent_recs_per_inode(struct super_block *sb) 525 { 526 int size; 527 528 size = sb->s_blocksize - 529 offsetof(struct ocfs2_dinode, id2.i_list.l_recs); 530 531 return size / sizeof(struct ocfs2_extent_rec); 532 } 533 534 static inline int ocfs2_chain_recs_per_inode(struct super_block *sb) 535 { 536 int size; 537 538 size = sb->s_blocksize - 539 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs); 540 541 return size / sizeof(struct ocfs2_chain_rec); 542 } 543 544 static inline u16 ocfs2_extent_recs_per_eb(struct super_block *sb) 545 { 546 int size; 547 548 size = sb->s_blocksize - 549 offsetof(struct ocfs2_extent_block, h_list.l_recs); 550 551 return size / sizeof(struct ocfs2_extent_rec); 552 } 553 554 static inline u16 ocfs2_local_alloc_size(struct super_block *sb) 555 { 556 u16 size; 557 558 size = sb->s_blocksize - 559 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap); 560 561 return size; 562 } 563 564 static inline int ocfs2_group_bitmap_size(struct super_block *sb) 565 { 566 int size; 567 568 size = sb->s_blocksize - 569 offsetof(struct ocfs2_group_desc, bg_bitmap); 570 571 return size; 572 } 573 574 static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb) 575 { 576 int size; 577 578 size = sb->s_blocksize - 579 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs); 580 581 return size / sizeof(struct ocfs2_truncate_rec); 582 } 583 584 static inline u64 ocfs2_backup_super_blkno(struct super_block *sb, int index) 585 { 586 u64 offset = OCFS2_BACKUP_SB_START; 587 588 if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) { 589 offset <<= (2 * index); 590 offset >>= sb->s_blocksize_bits; 591 return offset; 592 } 593 594 return 0; 595 596 } 597 #else 598 static inline int ocfs2_fast_symlink_chars(int blocksize) 599 { 600 return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink); 601 } 602 603 static inline int ocfs2_extent_recs_per_inode(int blocksize) 604 { 605 int size; 606 607 size = blocksize - 608 offsetof(struct ocfs2_dinode, id2.i_list.l_recs); 609 610 return size / sizeof(struct ocfs2_extent_rec); 611 } 612 613 static inline int ocfs2_chain_recs_per_inode(int blocksize) 614 { 615 int size; 616 617 size = blocksize - 618 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs); 619 620 return size / sizeof(struct ocfs2_chain_rec); 621 } 622 623 static inline int ocfs2_extent_recs_per_eb(int blocksize) 624 { 625 int size; 626 627 size = blocksize - 628 offsetof(struct ocfs2_extent_block, h_list.l_recs); 629 630 return size / sizeof(struct ocfs2_extent_rec); 631 } 632 633 static inline int ocfs2_local_alloc_size(int blocksize) 634 { 635 int size; 636 637 size = blocksize - 638 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap); 639 640 return size; 641 } 642 643 static inline int ocfs2_group_bitmap_size(int blocksize) 644 { 645 int size; 646 647 size = blocksize - 648 offsetof(struct ocfs2_group_desc, bg_bitmap); 649 650 return size; 651 } 652 653 static inline int ocfs2_truncate_recs_per_inode(int blocksize) 654 { 655 int size; 656 657 size = blocksize - 658 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs); 659 660 return size / sizeof(struct ocfs2_truncate_rec); 661 } 662 663 static inline uint64_t ocfs2_backup_super_blkno(int blocksize, int index) 664 { 665 uint64_t offset = OCFS2_BACKUP_SB_START; 666 667 if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) { 668 offset <<= (2 * index); 669 offset /= blocksize; 670 return offset; 671 } 672 673 return 0; 674 } 675 #endif /* __KERNEL__ */ 676 677 678 static inline int ocfs2_system_inode_is_global(int type) 679 { 680 return ((type >= 0) && 681 (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE)); 682 } 683 684 static inline int ocfs2_sprintf_system_inode_name(char *buf, int len, 685 int type, int slot) 686 { 687 int chars; 688 689 /* 690 * Global system inodes can only have one copy. Everything 691 * after OCFS2_LAST_GLOBAL_SYSTEM_INODE in the system inode 692 * list has a copy per slot. 693 */ 694 if (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE) 695 chars = snprintf(buf, len, 696 ocfs2_system_inodes[type].si_name); 697 else 698 chars = snprintf(buf, len, 699 ocfs2_system_inodes[type].si_name, 700 slot); 701 702 return chars; 703 } 704 705 static inline void ocfs2_set_de_type(struct ocfs2_dir_entry *de, 706 umode_t mode) 707 { 708 de->file_type = ocfs2_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 709 } 710 711 #endif /* _OCFS2_FS_H */ 712 713