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 72 /* Compatibility flags */ 73 #define OCFS2_HAS_COMPAT_FEATURE(sb,mask) \ 74 ( OCFS2_SB(sb)->s_feature_compat & (mask) ) 75 #define OCFS2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 76 ( OCFS2_SB(sb)->s_feature_ro_compat & (mask) ) 77 #define OCFS2_HAS_INCOMPAT_FEATURE(sb,mask) \ 78 ( OCFS2_SB(sb)->s_feature_incompat & (mask) ) 79 #define OCFS2_SET_COMPAT_FEATURE(sb,mask) \ 80 OCFS2_SB(sb)->s_feature_compat |= (mask) 81 #define OCFS2_SET_RO_COMPAT_FEATURE(sb,mask) \ 82 OCFS2_SB(sb)->s_feature_ro_compat |= (mask) 83 #define OCFS2_SET_INCOMPAT_FEATURE(sb,mask) \ 84 OCFS2_SB(sb)->s_feature_incompat |= (mask) 85 #define OCFS2_CLEAR_COMPAT_FEATURE(sb,mask) \ 86 OCFS2_SB(sb)->s_feature_compat &= ~(mask) 87 #define OCFS2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 88 OCFS2_SB(sb)->s_feature_ro_compat &= ~(mask) 89 #define OCFS2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 90 OCFS2_SB(sb)->s_feature_incompat &= ~(mask) 91 92 #define OCFS2_FEATURE_COMPAT_SUPP (OCFS2_FEATURE_COMPAT_BACKUP_SB \ 93 | OCFS2_FEATURE_COMPAT_JBD2_SB) 94 #define OCFS2_FEATURE_INCOMPAT_SUPP (OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT \ 95 | OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC \ 96 | OCFS2_FEATURE_INCOMPAT_INLINE_DATA \ 97 | OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP \ 98 | OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK \ 99 | OCFS2_FEATURE_INCOMPAT_XATTR \ 100 | OCFS2_FEATURE_INCOMPAT_META_ECC \ 101 | OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS) 102 #define OCFS2_FEATURE_RO_COMPAT_SUPP (OCFS2_FEATURE_RO_COMPAT_UNWRITTEN \ 103 | OCFS2_FEATURE_RO_COMPAT_USRQUOTA \ 104 | OCFS2_FEATURE_RO_COMPAT_GRPQUOTA) 105 106 /* 107 * Heartbeat-only devices are missing journals and other files. The 108 * filesystem driver can't load them, but the library can. Never put 109 * this in OCFS2_FEATURE_INCOMPAT_SUPP, *ever*. 110 */ 111 #define OCFS2_FEATURE_INCOMPAT_HEARTBEAT_DEV 0x0002 112 113 /* 114 * tunefs sets this incompat flag before starting the resize and clears it 115 * at the end. This flag protects users from inadvertently mounting the fs 116 * after an aborted run without fsck-ing. 117 */ 118 #define OCFS2_FEATURE_INCOMPAT_RESIZE_INPROG 0x0004 119 120 /* Used to denote a non-clustered volume */ 121 #define OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT 0x0008 122 123 /* Support for sparse allocation in b-trees */ 124 #define OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC 0x0010 125 126 /* 127 * Tunefs sets this incompat flag before starting an operation which 128 * would require cleanup on abort. This is done to protect users from 129 * inadvertently mounting the fs after an aborted run without 130 * fsck-ing. 131 * 132 * s_tunefs_flags on the super block describes precisely which 133 * operations were in progress. 134 */ 135 #define OCFS2_FEATURE_INCOMPAT_TUNEFS_INPROG 0x0020 136 137 /* Support for data packed into inode blocks */ 138 #define OCFS2_FEATURE_INCOMPAT_INLINE_DATA 0x0040 139 140 /* 141 * Support for alternate, userspace cluster stacks. If set, the superblock 142 * field s_cluster_info contains a tag for the alternate stack in use as 143 * well as the name of the cluster being joined. 144 * mount.ocfs2 must pass in a matching stack name. 145 * 146 * If not set, the classic stack will be used. This is compatbile with 147 * all older versions. 148 */ 149 #define OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK 0x0080 150 151 /* Support for the extended slot map */ 152 #define OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP 0x100 153 154 /* Support for extended attributes */ 155 #define OCFS2_FEATURE_INCOMPAT_XATTR 0x0200 156 157 /* Support for indexed directores */ 158 #define OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS 0x0400 159 160 /* Metadata checksum and error correction */ 161 #define OCFS2_FEATURE_INCOMPAT_META_ECC 0x0800 162 163 /* 164 * backup superblock flag is used to indicate that this volume 165 * has backup superblocks. 166 */ 167 #define OCFS2_FEATURE_COMPAT_BACKUP_SB 0x0001 168 169 /* 170 * The filesystem will correctly handle journal feature bits. 171 */ 172 #define OCFS2_FEATURE_COMPAT_JBD2_SB 0x0002 173 174 /* 175 * Unwritten extents support. 176 */ 177 #define OCFS2_FEATURE_RO_COMPAT_UNWRITTEN 0x0001 178 179 /* 180 * Maintain quota information for this filesystem 181 */ 182 #define OCFS2_FEATURE_RO_COMPAT_USRQUOTA 0x0002 183 #define OCFS2_FEATURE_RO_COMPAT_GRPQUOTA 0x0004 184 185 /* The byte offset of the first backup block will be 1G. 186 * The following will be 4G, 16G, 64G, 256G and 1T. 187 */ 188 #define OCFS2_BACKUP_SB_START 1 << 30 189 190 /* the max backup superblock nums */ 191 #define OCFS2_MAX_BACKUP_SUPERBLOCKS 6 192 193 /* 194 * Flags on ocfs2_super_block.s_tunefs_flags 195 */ 196 #define OCFS2_TUNEFS_INPROG_REMOVE_SLOT 0x0001 /* Removing slots */ 197 198 /* 199 * Flags on ocfs2_dinode.i_flags 200 */ 201 #define OCFS2_VALID_FL (0x00000001) /* Inode is valid */ 202 #define OCFS2_UNUSED2_FL (0x00000002) 203 #define OCFS2_ORPHANED_FL (0x00000004) /* On the orphan list */ 204 #define OCFS2_UNUSED3_FL (0x00000008) 205 /* System inode flags */ 206 #define OCFS2_SYSTEM_FL (0x00000010) /* System inode */ 207 #define OCFS2_SUPER_BLOCK_FL (0x00000020) /* Super block */ 208 #define OCFS2_LOCAL_ALLOC_FL (0x00000040) /* Slot local alloc bitmap */ 209 #define OCFS2_BITMAP_FL (0x00000080) /* Allocation bitmap */ 210 #define OCFS2_JOURNAL_FL (0x00000100) /* Slot local journal */ 211 #define OCFS2_HEARTBEAT_FL (0x00000200) /* Heartbeat area */ 212 #define OCFS2_CHAIN_FL (0x00000400) /* Chain allocator */ 213 #define OCFS2_DEALLOC_FL (0x00000800) /* Truncate log */ 214 #define OCFS2_QUOTA_FL (0x00001000) /* Quota file */ 215 216 /* 217 * Flags on ocfs2_dinode.i_dyn_features 218 * 219 * These can change much more often than i_flags. When adding flags, 220 * keep in mind that i_dyn_features is only 16 bits wide. 221 */ 222 #define OCFS2_INLINE_DATA_FL (0x0001) /* Data stored in inode block */ 223 #define OCFS2_HAS_XATTR_FL (0x0002) 224 #define OCFS2_INLINE_XATTR_FL (0x0004) 225 #define OCFS2_INDEXED_DIR_FL (0x0008) 226 227 /* Inode attributes, keep in sync with EXT2 */ 228 #define OCFS2_SECRM_FL (0x00000001) /* Secure deletion */ 229 #define OCFS2_UNRM_FL (0x00000002) /* Undelete */ 230 #define OCFS2_COMPR_FL (0x00000004) /* Compress file */ 231 #define OCFS2_SYNC_FL (0x00000008) /* Synchronous updates */ 232 #define OCFS2_IMMUTABLE_FL (0x00000010) /* Immutable file */ 233 #define OCFS2_APPEND_FL (0x00000020) /* writes to file may only append */ 234 #define OCFS2_NODUMP_FL (0x00000040) /* do not dump file */ 235 #define OCFS2_NOATIME_FL (0x00000080) /* do not update atime */ 236 #define OCFS2_DIRSYNC_FL (0x00010000) /* dirsync behaviour (directories only) */ 237 238 #define OCFS2_FL_VISIBLE (0x000100FF) /* User visible flags */ 239 #define OCFS2_FL_MODIFIABLE (0x000100FF) /* User modifiable flags */ 240 241 /* 242 * Extent record flags (e_node.leaf.flags) 243 */ 244 #define OCFS2_EXT_UNWRITTEN (0x01) /* Extent is allocated but 245 * unwritten */ 246 247 /* 248 * ioctl commands 249 */ 250 #define OCFS2_IOC_GETFLAGS _IOR('f', 1, long) 251 #define OCFS2_IOC_SETFLAGS _IOW('f', 2, long) 252 #define OCFS2_IOC32_GETFLAGS _IOR('f', 1, int) 253 #define OCFS2_IOC32_SETFLAGS _IOW('f', 2, int) 254 255 /* 256 * Space reservation / allocation / free ioctls and argument structure 257 * are designed to be compatible with XFS. 258 * 259 * ALLOCSP* and FREESP* are not and will never be supported, but are 260 * included here for completeness. 261 */ 262 struct ocfs2_space_resv { 263 __s16 l_type; 264 __s16 l_whence; 265 __s64 l_start; 266 __s64 l_len; /* len == 0 means until end of file */ 267 __s32 l_sysid; 268 __u32 l_pid; 269 __s32 l_pad[4]; /* reserve area */ 270 }; 271 272 #define OCFS2_IOC_ALLOCSP _IOW ('X', 10, struct ocfs2_space_resv) 273 #define OCFS2_IOC_FREESP _IOW ('X', 11, struct ocfs2_space_resv) 274 #define OCFS2_IOC_RESVSP _IOW ('X', 40, struct ocfs2_space_resv) 275 #define OCFS2_IOC_UNRESVSP _IOW ('X', 41, struct ocfs2_space_resv) 276 #define OCFS2_IOC_ALLOCSP64 _IOW ('X', 36, struct ocfs2_space_resv) 277 #define OCFS2_IOC_FREESP64 _IOW ('X', 37, struct ocfs2_space_resv) 278 #define OCFS2_IOC_RESVSP64 _IOW ('X', 42, struct ocfs2_space_resv) 279 #define OCFS2_IOC_UNRESVSP64 _IOW ('X', 43, struct ocfs2_space_resv) 280 281 /* Used to pass group descriptor data when online resize is done */ 282 struct ocfs2_new_group_input { 283 __u64 group; /* Group descriptor's blkno. */ 284 __u32 clusters; /* Total number of clusters in this group */ 285 __u32 frees; /* Total free clusters in this group */ 286 __u16 chain; /* Chain for this group */ 287 __u16 reserved1; 288 __u32 reserved2; 289 }; 290 291 #define OCFS2_IOC_GROUP_EXTEND _IOW('o', 1, int) 292 #define OCFS2_IOC_GROUP_ADD _IOW('o', 2,struct ocfs2_new_group_input) 293 #define OCFS2_IOC_GROUP_ADD64 _IOW('o', 3,struct ocfs2_new_group_input) 294 295 /* 296 * Journal Flags (ocfs2_dinode.id1.journal1.i_flags) 297 */ 298 #define OCFS2_JOURNAL_DIRTY_FL (0x00000001) /* Journal needs recovery */ 299 300 /* 301 * superblock s_state flags 302 */ 303 #define OCFS2_ERROR_FS (0x00000001) /* FS saw errors */ 304 305 /* Limit of space in ocfs2_dir_entry */ 306 #define OCFS2_MAX_FILENAME_LEN 255 307 308 /* Maximum slots on an ocfs2 file system */ 309 #define OCFS2_MAX_SLOTS 255 310 311 /* Slot map indicator for an empty slot */ 312 #define OCFS2_INVALID_SLOT -1 313 314 #define OCFS2_VOL_UUID_LEN 16 315 #define OCFS2_MAX_VOL_LABEL_LEN 64 316 317 /* The alternate, userspace stack fields */ 318 #define OCFS2_STACK_LABEL_LEN 4 319 #define OCFS2_CLUSTER_NAME_LEN 16 320 321 /* Journal limits (in bytes) */ 322 #define OCFS2_MIN_JOURNAL_SIZE (4 * 1024 * 1024) 323 324 /* 325 * Default local alloc size (in megabytes) 326 * 327 * The value chosen should be such that most allocations, including new 328 * block groups, use local alloc. 329 */ 330 #define OCFS2_DEFAULT_LOCAL_ALLOC_SIZE 8 331 332 /* 333 * Inline extended attribute size (in bytes) 334 * The value chosen should be aligned to 16 byte boundaries. 335 */ 336 #define OCFS2_MIN_XATTR_INLINE_SIZE 256 337 338 struct ocfs2_system_inode_info { 339 char *si_name; 340 int si_iflags; 341 int si_mode; 342 }; 343 344 /* System file index */ 345 enum { 346 BAD_BLOCK_SYSTEM_INODE = 0, 347 GLOBAL_INODE_ALLOC_SYSTEM_INODE, 348 SLOT_MAP_SYSTEM_INODE, 349 #define OCFS2_FIRST_ONLINE_SYSTEM_INODE SLOT_MAP_SYSTEM_INODE 350 HEARTBEAT_SYSTEM_INODE, 351 GLOBAL_BITMAP_SYSTEM_INODE, 352 USER_QUOTA_SYSTEM_INODE, 353 GROUP_QUOTA_SYSTEM_INODE, 354 #define OCFS2_LAST_GLOBAL_SYSTEM_INODE GROUP_QUOTA_SYSTEM_INODE 355 ORPHAN_DIR_SYSTEM_INODE, 356 EXTENT_ALLOC_SYSTEM_INODE, 357 INODE_ALLOC_SYSTEM_INODE, 358 JOURNAL_SYSTEM_INODE, 359 LOCAL_ALLOC_SYSTEM_INODE, 360 TRUNCATE_LOG_SYSTEM_INODE, 361 LOCAL_USER_QUOTA_SYSTEM_INODE, 362 LOCAL_GROUP_QUOTA_SYSTEM_INODE, 363 NUM_SYSTEM_INODES 364 }; 365 366 static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = { 367 /* Global system inodes (single copy) */ 368 /* The first two are only used from userspace mfks/tunefs */ 369 [BAD_BLOCK_SYSTEM_INODE] = { "bad_blocks", 0, S_IFREG | 0644 }, 370 [GLOBAL_INODE_ALLOC_SYSTEM_INODE] = { "global_inode_alloc", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, 371 372 /* These are used by the running filesystem */ 373 [SLOT_MAP_SYSTEM_INODE] = { "slot_map", 0, S_IFREG | 0644 }, 374 [HEARTBEAT_SYSTEM_INODE] = { "heartbeat", OCFS2_HEARTBEAT_FL, S_IFREG | 0644 }, 375 [GLOBAL_BITMAP_SYSTEM_INODE] = { "global_bitmap", 0, S_IFREG | 0644 }, 376 [USER_QUOTA_SYSTEM_INODE] = { "aquota.user", OCFS2_QUOTA_FL, S_IFREG | 0644 }, 377 [GROUP_QUOTA_SYSTEM_INODE] = { "aquota.group", OCFS2_QUOTA_FL, S_IFREG | 0644 }, 378 379 /* Slot-specific system inodes (one copy per slot) */ 380 [ORPHAN_DIR_SYSTEM_INODE] = { "orphan_dir:%04d", 0, S_IFDIR | 0755 }, 381 [EXTENT_ALLOC_SYSTEM_INODE] = { "extent_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, 382 [INODE_ALLOC_SYSTEM_INODE] = { "inode_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, 383 [JOURNAL_SYSTEM_INODE] = { "journal:%04d", OCFS2_JOURNAL_FL, S_IFREG | 0644 }, 384 [LOCAL_ALLOC_SYSTEM_INODE] = { "local_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_LOCAL_ALLOC_FL, S_IFREG | 0644 }, 385 [TRUNCATE_LOG_SYSTEM_INODE] = { "truncate_log:%04d", OCFS2_DEALLOC_FL, S_IFREG | 0644 }, 386 [LOCAL_USER_QUOTA_SYSTEM_INODE] = { "aquota.user:%04d", OCFS2_QUOTA_FL, S_IFREG | 0644 }, 387 [LOCAL_GROUP_QUOTA_SYSTEM_INODE] = { "aquota.group:%04d", OCFS2_QUOTA_FL, S_IFREG | 0644 }, 388 }; 389 390 /* Parameter passed from mount.ocfs2 to module */ 391 #define OCFS2_HB_NONE "heartbeat=none" 392 #define OCFS2_HB_LOCAL "heartbeat=local" 393 394 /* 395 * OCFS2 directory file types. Only the low 3 bits are used. The 396 * other bits are reserved for now. 397 */ 398 #define OCFS2_FT_UNKNOWN 0 399 #define OCFS2_FT_REG_FILE 1 400 #define OCFS2_FT_DIR 2 401 #define OCFS2_FT_CHRDEV 3 402 #define OCFS2_FT_BLKDEV 4 403 #define OCFS2_FT_FIFO 5 404 #define OCFS2_FT_SOCK 6 405 #define OCFS2_FT_SYMLINK 7 406 407 #define OCFS2_FT_MAX 8 408 409 /* 410 * OCFS2_DIR_PAD defines the directory entries boundaries 411 * 412 * NOTE: It must be a multiple of 4 413 */ 414 #define OCFS2_DIR_PAD 4 415 #define OCFS2_DIR_ROUND (OCFS2_DIR_PAD - 1) 416 #define OCFS2_DIR_MEMBER_LEN offsetof(struct ocfs2_dir_entry, name) 417 #define OCFS2_DIR_REC_LEN(name_len) (((name_len) + OCFS2_DIR_MEMBER_LEN + \ 418 OCFS2_DIR_ROUND) & \ 419 ~OCFS2_DIR_ROUND) 420 #define OCFS2_DIR_MIN_REC_LEN OCFS2_DIR_REC_LEN(1) 421 422 #define OCFS2_LINK_MAX 32000 423 #define OCFS2_DX_LINK_MAX ((1U << 31) - 1U) 424 #define OCFS2_LINKS_HI_SHIFT 16 425 #define OCFS2_DX_ENTRIES_MAX (0xffffffffU) 426 427 #define S_SHIFT 12 428 static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = { 429 [S_IFREG >> S_SHIFT] = OCFS2_FT_REG_FILE, 430 [S_IFDIR >> S_SHIFT] = OCFS2_FT_DIR, 431 [S_IFCHR >> S_SHIFT] = OCFS2_FT_CHRDEV, 432 [S_IFBLK >> S_SHIFT] = OCFS2_FT_BLKDEV, 433 [S_IFIFO >> S_SHIFT] = OCFS2_FT_FIFO, 434 [S_IFSOCK >> S_SHIFT] = OCFS2_FT_SOCK, 435 [S_IFLNK >> S_SHIFT] = OCFS2_FT_SYMLINK, 436 }; 437 438 439 /* 440 * Convenience casts 441 */ 442 #define OCFS2_RAW_SB(dinode) (&((dinode)->id2.i_super)) 443 444 /* 445 * Block checking structure. This is used in metadata to validate the 446 * contents. If OCFS2_FEATURE_INCOMPAT_META_ECC is not set, it is all 447 * zeros. 448 */ 449 struct ocfs2_block_check { 450 /*00*/ __le32 bc_crc32e; /* 802.3 Ethernet II CRC32 */ 451 __le16 bc_ecc; /* Single-error-correction parity vector. 452 This is a simple Hamming code dependant 453 on the blocksize. OCFS2's maximum 454 blocksize, 4K, requires 16 parity bits, 455 so we fit in __le16. */ 456 __le16 bc_reserved1; 457 /*08*/ 458 }; 459 460 /* 461 * On disk extent record for OCFS2 462 * It describes a range of clusters on disk. 463 * 464 * Length fields are divided into interior and leaf node versions. 465 * This leaves room for a flags field (OCFS2_EXT_*) in the leaf nodes. 466 */ 467 struct ocfs2_extent_rec { 468 /*00*/ __le32 e_cpos; /* Offset into the file, in clusters */ 469 union { 470 __le32 e_int_clusters; /* Clusters covered by all children */ 471 struct { 472 __le16 e_leaf_clusters; /* Clusters covered by this 473 extent */ 474 __u8 e_reserved1; 475 __u8 e_flags; /* Extent flags */ 476 }; 477 }; 478 __le64 e_blkno; /* Physical disk offset, in blocks */ 479 /*10*/ 480 }; 481 482 struct ocfs2_chain_rec { 483 __le32 c_free; /* Number of free bits in this chain. */ 484 __le32 c_total; /* Number of total bits in this chain */ 485 __le64 c_blkno; /* Physical disk offset (blocks) of 1st group */ 486 }; 487 488 struct ocfs2_truncate_rec { 489 __le32 t_start; /* 1st cluster in this log */ 490 __le32 t_clusters; /* Number of total clusters covered */ 491 }; 492 493 /* 494 * On disk extent list for OCFS2 (node in the tree). Note that this 495 * is contained inside ocfs2_dinode or ocfs2_extent_block, so the 496 * offsets are relative to ocfs2_dinode.id2.i_list or 497 * ocfs2_extent_block.h_list, respectively. 498 */ 499 struct ocfs2_extent_list { 500 /*00*/ __le16 l_tree_depth; /* Extent tree depth from this 501 point. 0 means data extents 502 hang directly off this 503 header (a leaf) 504 NOTE: The high 8 bits cannot be 505 used - tree_depth is never that big. 506 */ 507 __le16 l_count; /* Number of extent records */ 508 __le16 l_next_free_rec; /* Next unused extent slot */ 509 __le16 l_reserved1; 510 __le64 l_reserved2; /* Pad to 511 sizeof(ocfs2_extent_rec) */ 512 /*10*/ struct ocfs2_extent_rec l_recs[0]; /* Extent records */ 513 }; 514 515 /* 516 * On disk allocation chain list for OCFS2. Note that this is 517 * contained inside ocfs2_dinode, so the offsets are relative to 518 * ocfs2_dinode.id2.i_chain. 519 */ 520 struct ocfs2_chain_list { 521 /*00*/ __le16 cl_cpg; /* Clusters per Block Group */ 522 __le16 cl_bpc; /* Bits per cluster */ 523 __le16 cl_count; /* Total chains in this list */ 524 __le16 cl_next_free_rec; /* Next unused chain slot */ 525 __le64 cl_reserved1; 526 /*10*/ struct ocfs2_chain_rec cl_recs[0]; /* Chain records */ 527 }; 528 529 /* 530 * On disk deallocation log for OCFS2. Note that this is 531 * contained inside ocfs2_dinode, so the offsets are relative to 532 * ocfs2_dinode.id2.i_dealloc. 533 */ 534 struct ocfs2_truncate_log { 535 /*00*/ __le16 tl_count; /* Total records in this log */ 536 __le16 tl_used; /* Number of records in use */ 537 __le32 tl_reserved1; 538 /*08*/ struct ocfs2_truncate_rec tl_recs[0]; /* Truncate records */ 539 }; 540 541 /* 542 * On disk extent block (indirect block) for OCFS2 543 */ 544 struct ocfs2_extent_block 545 { 546 /*00*/ __u8 h_signature[8]; /* Signature for verification */ 547 struct ocfs2_block_check h_check; /* Error checking */ 548 /*10*/ __le16 h_suballoc_slot; /* Slot suballocator this 549 extent_header belongs to */ 550 __le16 h_suballoc_bit; /* Bit offset in suballocator 551 block group */ 552 __le32 h_fs_generation; /* Must match super block */ 553 __le64 h_blkno; /* Offset on disk, in blocks */ 554 /*20*/ __le64 h_reserved3; 555 __le64 h_next_leaf_blk; /* Offset on disk, in blocks, 556 of next leaf header pointing 557 to data */ 558 /*30*/ struct ocfs2_extent_list h_list; /* Extent record list */ 559 /* Actual on-disk size is one block */ 560 }; 561 562 /* 563 * On disk slot map for OCFS2. This defines the contents of the "slot_map" 564 * system file. A slot is valid if it contains a node number >= 0. The 565 * value -1 (0xFFFF) is OCFS2_INVALID_SLOT. This marks a slot empty. 566 */ 567 struct ocfs2_slot_map { 568 /*00*/ __le16 sm_slots[0]; 569 /* 570 * Actual on-disk size is one block. OCFS2_MAX_SLOTS is 255, 571 * 255 * sizeof(__le16) == 512B, within the 512B block minimum blocksize. 572 */ 573 }; 574 575 struct ocfs2_extended_slot { 576 /*00*/ __u8 es_valid; 577 __u8 es_reserved1[3]; 578 __le32 es_node_num; 579 /*10*/ 580 }; 581 582 /* 583 * The extended slot map, used when OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP 584 * is set. It separates out the valid marker from the node number, and 585 * has room to grow. Unlike the old slot map, this format is defined by 586 * i_size. 587 */ 588 struct ocfs2_slot_map_extended { 589 /*00*/ struct ocfs2_extended_slot se_slots[0]; 590 /* 591 * Actual size is i_size of the slot_map system file. It should 592 * match s_max_slots * sizeof(struct ocfs2_extended_slot) 593 */ 594 }; 595 596 struct ocfs2_cluster_info { 597 /*00*/ __u8 ci_stack[OCFS2_STACK_LABEL_LEN]; 598 __le32 ci_reserved; 599 /*08*/ __u8 ci_cluster[OCFS2_CLUSTER_NAME_LEN]; 600 /*18*/ 601 }; 602 603 /* 604 * On disk superblock for OCFS2 605 * Note that it is contained inside an ocfs2_dinode, so all offsets 606 * are relative to the start of ocfs2_dinode.id2. 607 */ 608 struct ocfs2_super_block { 609 /*00*/ __le16 s_major_rev_level; 610 __le16 s_minor_rev_level; 611 __le16 s_mnt_count; 612 __le16 s_max_mnt_count; 613 __le16 s_state; /* File system state */ 614 __le16 s_errors; /* Behaviour when detecting errors */ 615 __le32 s_checkinterval; /* Max time between checks */ 616 /*10*/ __le64 s_lastcheck; /* Time of last check */ 617 __le32 s_creator_os; /* OS */ 618 __le32 s_feature_compat; /* Compatible feature set */ 619 /*20*/ __le32 s_feature_incompat; /* Incompatible feature set */ 620 __le32 s_feature_ro_compat; /* Readonly-compatible feature set */ 621 __le64 s_root_blkno; /* Offset, in blocks, of root directory 622 dinode */ 623 /*30*/ __le64 s_system_dir_blkno; /* Offset, in blocks, of system 624 directory dinode */ 625 __le32 s_blocksize_bits; /* Blocksize for this fs */ 626 __le32 s_clustersize_bits; /* Clustersize for this fs */ 627 /*40*/ __le16 s_max_slots; /* Max number of simultaneous mounts 628 before tunefs required */ 629 __le16 s_tunefs_flag; 630 __le32 s_uuid_hash; /* hash value of uuid */ 631 __le64 s_first_cluster_group; /* Block offset of 1st cluster 632 * group header */ 633 /*50*/ __u8 s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */ 634 /*90*/ __u8 s_uuid[OCFS2_VOL_UUID_LEN]; /* 128-bit uuid */ 635 /*A0*/ struct ocfs2_cluster_info s_cluster_info; /* Selected userspace 636 stack. Only valid 637 with INCOMPAT flag. */ 638 /*B8*/ __le16 s_xattr_inline_size; /* extended attribute inline size 639 for this fs*/ 640 __le16 s_reserved0; 641 __le32 s_dx_seed[3]; /* seed[0-2] for dx dir hash. 642 * s_uuid_hash serves as seed[3]. */ 643 /*C0*/ __le64 s_reserved2[15]; /* Fill out superblock */ 644 /*140*/ 645 646 /* 647 * NOTE: As stated above, all offsets are relative to 648 * ocfs2_dinode.id2, which is at 0xC0 in the inode. 649 * 0xC0 + 0x140 = 0x200 or 512 bytes. A superblock must fit within 650 * our smallest blocksize, which is 512 bytes. To ensure this, 651 * we reserve the space in s_reserved2. Anything past s_reserved2 652 * will not be available on the smallest blocksize. 653 */ 654 }; 655 656 /* 657 * Local allocation bitmap for OCFS2 slots 658 * Note that it exists inside an ocfs2_dinode, so all offsets are 659 * relative to the start of ocfs2_dinode.id2. 660 */ 661 struct ocfs2_local_alloc 662 { 663 /*00*/ __le32 la_bm_off; /* Starting bit offset in main bitmap */ 664 __le16 la_size; /* Size of included bitmap, in bytes */ 665 __le16 la_reserved1; 666 __le64 la_reserved2; 667 /*10*/ __u8 la_bitmap[0]; 668 }; 669 670 /* 671 * Data-in-inode header. This is only used if i_dyn_features has 672 * OCFS2_INLINE_DATA_FL set. 673 */ 674 struct ocfs2_inline_data 675 { 676 /*00*/ __le16 id_count; /* Number of bytes that can be used 677 * for data, starting at id_data */ 678 __le16 id_reserved0; 679 __le32 id_reserved1; 680 __u8 id_data[0]; /* Start of user data */ 681 }; 682 683 /* 684 * On disk inode for OCFS2 685 */ 686 struct ocfs2_dinode { 687 /*00*/ __u8 i_signature[8]; /* Signature for validation */ 688 __le32 i_generation; /* Generation number */ 689 __le16 i_suballoc_slot; /* Slot suballocator this inode 690 belongs to */ 691 __le16 i_suballoc_bit; /* Bit offset in suballocator 692 block group */ 693 /*10*/ __le16 i_links_count_hi; /* High 16 bits of links count */ 694 __le16 i_xattr_inline_size; 695 __le32 i_clusters; /* Cluster count */ 696 __le32 i_uid; /* Owner UID */ 697 __le32 i_gid; /* Owning GID */ 698 /*20*/ __le64 i_size; /* Size in bytes */ 699 __le16 i_mode; /* File mode */ 700 __le16 i_links_count; /* Links count */ 701 __le32 i_flags; /* File flags */ 702 /*30*/ __le64 i_atime; /* Access time */ 703 __le64 i_ctime; /* Creation time */ 704 /*40*/ __le64 i_mtime; /* Modification time */ 705 __le64 i_dtime; /* Deletion time */ 706 /*50*/ __le64 i_blkno; /* Offset on disk, in blocks */ 707 __le64 i_last_eb_blk; /* Pointer to last extent 708 block */ 709 /*60*/ __le32 i_fs_generation; /* Generation per fs-instance */ 710 __le32 i_atime_nsec; 711 __le32 i_ctime_nsec; 712 __le32 i_mtime_nsec; 713 /*70*/ __le32 i_attr; 714 __le16 i_orphaned_slot; /* Only valid when OCFS2_ORPHANED_FL 715 was set in i_flags */ 716 __le16 i_dyn_features; 717 __le64 i_xattr_loc; 718 /*80*/ struct ocfs2_block_check i_check; /* Error checking */ 719 /*88*/ __le64 i_dx_root; /* Pointer to dir index root block */ 720 __le64 i_reserved2[5]; 721 /*B8*/ union { 722 __le64 i_pad1; /* Generic way to refer to this 723 64bit union */ 724 struct { 725 __le64 i_rdev; /* Device number */ 726 } dev1; 727 struct { /* Info for bitmap system 728 inodes */ 729 __le32 i_used; /* Bits (ie, clusters) used */ 730 __le32 i_total; /* Total bits (clusters) 731 available */ 732 } bitmap1; 733 struct { /* Info for journal system 734 inodes */ 735 __le32 ij_flags; /* Mounted, version, etc. */ 736 __le32 ij_recovery_generation; /* Incremented when the 737 journal is recovered 738 after an unclean 739 shutdown */ 740 } journal1; 741 } id1; /* Inode type dependant 1 */ 742 /*C0*/ union { 743 struct ocfs2_super_block i_super; 744 struct ocfs2_local_alloc i_lab; 745 struct ocfs2_chain_list i_chain; 746 struct ocfs2_extent_list i_list; 747 struct ocfs2_truncate_log i_dealloc; 748 struct ocfs2_inline_data i_data; 749 __u8 i_symlink[0]; 750 } id2; 751 /* Actual on-disk size is one block */ 752 }; 753 754 /* 755 * On-disk directory entry structure for OCFS2 756 * 757 * Packed as this structure could be accessed unaligned on 64-bit platforms 758 */ 759 struct ocfs2_dir_entry { 760 /*00*/ __le64 inode; /* Inode number */ 761 __le16 rec_len; /* Directory entry length */ 762 __u8 name_len; /* Name length */ 763 __u8 file_type; 764 /*0C*/ char name[OCFS2_MAX_FILENAME_LEN]; /* File name */ 765 /* Actual on-disk length specified by rec_len */ 766 } __attribute__ ((packed)); 767 768 /* 769 * Per-block record for the unindexed directory btree. This is carefully 770 * crafted so that the rec_len and name_len records of an ocfs2_dir_entry are 771 * mirrored. That way, the directory manipulation code needs a minimal amount 772 * of update. 773 * 774 * NOTE: Keep this structure aligned to a multiple of 4 bytes. 775 */ 776 struct ocfs2_dir_block_trailer { 777 /*00*/ __le64 db_compat_inode; /* Always zero. Was inode */ 778 779 __le16 db_compat_rec_len; /* Backwards compatible with 780 * ocfs2_dir_entry. */ 781 __u8 db_compat_name_len; /* Always zero. Was name_len */ 782 __u8 db_reserved0; 783 __le16 db_reserved1; 784 __le16 db_free_rec_len; /* Size of largest empty hole 785 * in this block. (unused) */ 786 /*10*/ __u8 db_signature[8]; /* Signature for verification */ 787 __le64 db_reserved2; 788 __le64 db_free_next; /* Next block in list (unused) */ 789 /*20*/ __le64 db_blkno; /* Offset on disk, in blocks */ 790 __le64 db_parent_dinode; /* dinode which owns me, in 791 blocks */ 792 /*30*/ struct ocfs2_block_check db_check; /* Error checking */ 793 /*40*/ 794 }; 795 796 /* 797 * A directory entry in the indexed tree. We don't store the full name here, 798 * but instead provide a pointer to the full dirent in the unindexed tree. 799 * 800 * We also store name_len here so as to reduce the number of leaf blocks we 801 * need to search in case of collisions. 802 */ 803 struct ocfs2_dx_entry { 804 __le32 dx_major_hash; /* Used to find logical 805 * cluster in index */ 806 __le32 dx_minor_hash; /* Lower bits used to find 807 * block in cluster */ 808 __le64 dx_dirent_blk; /* Physical block in unindexed 809 * tree holding this dirent. */ 810 }; 811 812 struct ocfs2_dx_entry_list { 813 __le32 de_reserved; 814 __le16 de_count; /* Maximum number of entries 815 * possible in de_entries */ 816 __le16 de_num_used; /* Current number of 817 * de_entries entries */ 818 struct ocfs2_dx_entry de_entries[0]; /* Indexed dir entries 819 * in a packed array of 820 * length de_num_used */ 821 }; 822 823 #define OCFS2_DX_FLAG_INLINE 0x01 824 825 /* 826 * A directory indexing block. Each indexed directory has one of these, 827 * pointed to by ocfs2_dinode. 828 * 829 * This block stores an indexed btree root, and a set of free space 830 * start-of-list pointers. 831 */ 832 struct ocfs2_dx_root_block { 833 __u8 dr_signature[8]; /* Signature for verification */ 834 struct ocfs2_block_check dr_check; /* Error checking */ 835 __le16 dr_suballoc_slot; /* Slot suballocator this 836 * block belongs to. */ 837 __le16 dr_suballoc_bit; /* Bit offset in suballocator 838 * block group */ 839 __le32 dr_fs_generation; /* Must match super block */ 840 __le64 dr_blkno; /* Offset on disk, in blocks */ 841 __le64 dr_last_eb_blk; /* Pointer to last 842 * extent block */ 843 __le32 dr_clusters; /* Clusters allocated 844 * to the indexed tree. */ 845 __u8 dr_flags; /* OCFS2_DX_FLAG_* flags */ 846 __u8 dr_reserved0; 847 __le16 dr_reserved1; 848 __le64 dr_dir_blkno; /* Pointer to parent inode */ 849 __le32 dr_num_entries; /* Total number of 850 * names stored in 851 * this directory.*/ 852 __le32 dr_reserved2; 853 __le64 dr_free_blk; /* Pointer to head of free 854 * unindexed block list. */ 855 __le64 dr_reserved3[15]; 856 union { 857 struct ocfs2_extent_list dr_list; /* Keep this aligned to 128 858 * bits for maximum space 859 * efficiency. */ 860 struct ocfs2_dx_entry_list dr_entries; /* In-root-block list of 861 * entries. We grow out 862 * to extents if this 863 * gets too big. */ 864 }; 865 }; 866 867 /* 868 * The header of a leaf block in the indexed tree. 869 */ 870 struct ocfs2_dx_leaf { 871 __u8 dl_signature[8];/* Signature for verification */ 872 struct ocfs2_block_check dl_check; /* Error checking */ 873 __le64 dl_blkno; /* Offset on disk, in blocks */ 874 __le32 dl_fs_generation;/* Must match super block */ 875 __le32 dl_reserved0; 876 __le64 dl_reserved1; 877 struct ocfs2_dx_entry_list dl_list; 878 }; 879 880 /* 881 * On disk allocator group structure for OCFS2 882 */ 883 struct ocfs2_group_desc 884 { 885 /*00*/ __u8 bg_signature[8]; /* Signature for validation */ 886 __le16 bg_size; /* Size of included bitmap in 887 bytes. */ 888 __le16 bg_bits; /* Bits represented by this 889 group. */ 890 __le16 bg_free_bits_count; /* Free bits count */ 891 __le16 bg_chain; /* What chain I am in. */ 892 /*10*/ __le32 bg_generation; 893 __le32 bg_reserved1; 894 __le64 bg_next_group; /* Next group in my list, in 895 blocks */ 896 /*20*/ __le64 bg_parent_dinode; /* dinode which owns me, in 897 blocks */ 898 __le64 bg_blkno; /* Offset on disk, in blocks */ 899 /*30*/ struct ocfs2_block_check bg_check; /* Error checking */ 900 __le64 bg_reserved2; 901 /*40*/ __u8 bg_bitmap[0]; 902 }; 903 904 /* 905 * On disk extended attribute structure for OCFS2. 906 */ 907 908 /* 909 * ocfs2_xattr_entry indicates one extend attribute. 910 * 911 * Note that it can be stored in inode, one block or one xattr bucket. 912 */ 913 struct ocfs2_xattr_entry { 914 __le32 xe_name_hash; /* hash value of xattr prefix+suffix. */ 915 __le16 xe_name_offset; /* byte offset from the 1st entry in the 916 local xattr storage(inode, xattr block or 917 xattr bucket). */ 918 __u8 xe_name_len; /* xattr name len, does't include prefix. */ 919 __u8 xe_type; /* the low 7 bits indicate the name prefix 920 * type and the highest bit indicates whether 921 * the EA is stored in the local storage. */ 922 __le64 xe_value_size; /* real xattr value length. */ 923 }; 924 925 /* 926 * On disk structure for xattr header. 927 * 928 * One ocfs2_xattr_header describes how many ocfs2_xattr_entry records in 929 * the local xattr storage. 930 */ 931 struct ocfs2_xattr_header { 932 __le16 xh_count; /* contains the count of how 933 many records are in the 934 local xattr storage. */ 935 __le16 xh_free_start; /* current offset for storing 936 xattr. */ 937 __le16 xh_name_value_len; /* total length of name/value 938 length in this bucket. */ 939 __le16 xh_num_buckets; /* Number of xattr buckets 940 in this extent record, 941 only valid in the first 942 bucket. */ 943 struct ocfs2_block_check xh_check; /* Error checking 944 (Note, this is only 945 used for xattr 946 buckets. A block uses 947 xb_check and sets 948 this field to zero.) */ 949 struct ocfs2_xattr_entry xh_entries[0]; /* xattr entry list. */ 950 }; 951 952 /* 953 * On disk structure for xattr value root. 954 * 955 * When an xattr's value is large enough, it is stored in an external 956 * b-tree like file data. The xattr value root points to this structure. 957 */ 958 struct ocfs2_xattr_value_root { 959 /*00*/ __le32 xr_clusters; /* clusters covered by xattr value. */ 960 __le32 xr_reserved0; 961 __le64 xr_last_eb_blk; /* Pointer to last extent block */ 962 /*10*/ struct ocfs2_extent_list xr_list; /* Extent record list */ 963 }; 964 965 /* 966 * On disk structure for xattr tree root. 967 * 968 * It is used when there are too many extended attributes for one file. These 969 * attributes will be organized and stored in an indexed-btree. 970 */ 971 struct ocfs2_xattr_tree_root { 972 /*00*/ __le32 xt_clusters; /* clusters covered by xattr. */ 973 __le32 xt_reserved0; 974 __le64 xt_last_eb_blk; /* Pointer to last extent block */ 975 /*10*/ struct ocfs2_extent_list xt_list; /* Extent record list */ 976 }; 977 978 #define OCFS2_XATTR_INDEXED 0x1 979 #define OCFS2_HASH_SHIFT 5 980 #define OCFS2_XATTR_ROUND 3 981 #define OCFS2_XATTR_SIZE(size) (((size) + OCFS2_XATTR_ROUND) & \ 982 ~(OCFS2_XATTR_ROUND)) 983 984 #define OCFS2_XATTR_BUCKET_SIZE 4096 985 #define OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET (OCFS2_XATTR_BUCKET_SIZE \ 986 / OCFS2_MIN_BLOCKSIZE) 987 988 /* 989 * On disk structure for xattr block. 990 */ 991 struct ocfs2_xattr_block { 992 /*00*/ __u8 xb_signature[8]; /* Signature for verification */ 993 __le16 xb_suballoc_slot; /* Slot suballocator this 994 block belongs to. */ 995 __le16 xb_suballoc_bit; /* Bit offset in suballocator 996 block group */ 997 __le32 xb_fs_generation; /* Must match super block */ 998 /*10*/ __le64 xb_blkno; /* Offset on disk, in blocks */ 999 struct ocfs2_block_check xb_check; /* Error checking */ 1000 /*20*/ __le16 xb_flags; /* Indicates whether this block contains 1001 real xattr or a xattr tree. */ 1002 __le16 xb_reserved0; 1003 __le32 xb_reserved1; 1004 __le64 xb_reserved2; 1005 /*30*/ union { 1006 struct ocfs2_xattr_header xb_header; /* xattr header if this 1007 block contains xattr */ 1008 struct ocfs2_xattr_tree_root xb_root;/* xattr tree root if this 1009 block cotains xattr 1010 tree. */ 1011 } xb_attrs; 1012 }; 1013 1014 #define OCFS2_XATTR_ENTRY_LOCAL 0x80 1015 #define OCFS2_XATTR_TYPE_MASK 0x7F 1016 static inline void ocfs2_xattr_set_local(struct ocfs2_xattr_entry *xe, 1017 int local) 1018 { 1019 if (local) 1020 xe->xe_type |= OCFS2_XATTR_ENTRY_LOCAL; 1021 else 1022 xe->xe_type &= ~OCFS2_XATTR_ENTRY_LOCAL; 1023 } 1024 1025 static inline int ocfs2_xattr_is_local(struct ocfs2_xattr_entry *xe) 1026 { 1027 return xe->xe_type & OCFS2_XATTR_ENTRY_LOCAL; 1028 } 1029 1030 static inline void ocfs2_xattr_set_type(struct ocfs2_xattr_entry *xe, int type) 1031 { 1032 xe->xe_type |= type & OCFS2_XATTR_TYPE_MASK; 1033 } 1034 1035 static inline int ocfs2_xattr_get_type(struct ocfs2_xattr_entry *xe) 1036 { 1037 return xe->xe_type & OCFS2_XATTR_TYPE_MASK; 1038 } 1039 1040 /* 1041 * On disk structures for global quota file 1042 */ 1043 1044 /* Magic numbers and known versions for global quota files */ 1045 #define OCFS2_GLOBAL_QMAGICS {\ 1046 0x0cf52470, /* USRQUOTA */ \ 1047 0x0cf52471 /* GRPQUOTA */ \ 1048 } 1049 1050 #define OCFS2_GLOBAL_QVERSIONS {\ 1051 0, \ 1052 0, \ 1053 } 1054 1055 1056 /* Each block of each quota file has a certain fixed number of bytes reserved 1057 * for OCFS2 internal use at its end. OCFS2 can use it for things like 1058 * checksums, etc. */ 1059 #define OCFS2_QBLK_RESERVED_SPACE 8 1060 1061 /* Generic header of all quota files */ 1062 struct ocfs2_disk_dqheader { 1063 __le32 dqh_magic; /* Magic number identifying file */ 1064 __le32 dqh_version; /* Quota format version */ 1065 }; 1066 1067 #define OCFS2_GLOBAL_INFO_OFF (sizeof(struct ocfs2_disk_dqheader)) 1068 1069 /* Information header of global quota file (immediately follows the generic 1070 * header) */ 1071 struct ocfs2_global_disk_dqinfo { 1072 /*00*/ __le32 dqi_bgrace; /* Grace time for space softlimit excess */ 1073 __le32 dqi_igrace; /* Grace time for inode softlimit excess */ 1074 __le32 dqi_syncms; /* Time after which we sync local changes to 1075 * global quota file */ 1076 __le32 dqi_blocks; /* Number of blocks in quota file */ 1077 /*10*/ __le32 dqi_free_blk; /* First free block in quota file */ 1078 __le32 dqi_free_entry; /* First block with free dquot entry in quota 1079 * file */ 1080 }; 1081 1082 /* Structure with global user / group information. We reserve some space 1083 * for future use. */ 1084 struct ocfs2_global_disk_dqblk { 1085 /*00*/ __le32 dqb_id; /* ID the structure belongs to */ 1086 __le32 dqb_use_count; /* Number of nodes having reference to this structure */ 1087 __le64 dqb_ihardlimit; /* absolute limit on allocated inodes */ 1088 /*10*/ __le64 dqb_isoftlimit; /* preferred inode limit */ 1089 __le64 dqb_curinodes; /* current # allocated inodes */ 1090 /*20*/ __le64 dqb_bhardlimit; /* absolute limit on disk space */ 1091 __le64 dqb_bsoftlimit; /* preferred limit on disk space */ 1092 /*30*/ __le64 dqb_curspace; /* current space occupied */ 1093 __le64 dqb_btime; /* time limit for excessive disk use */ 1094 /*40*/ __le64 dqb_itime; /* time limit for excessive inode use */ 1095 __le64 dqb_pad1; 1096 /*50*/ __le64 dqb_pad2; 1097 }; 1098 1099 /* 1100 * On-disk structures for local quota file 1101 */ 1102 1103 /* Magic numbers and known versions for local quota files */ 1104 #define OCFS2_LOCAL_QMAGICS {\ 1105 0x0cf524c0, /* USRQUOTA */ \ 1106 0x0cf524c1 /* GRPQUOTA */ \ 1107 } 1108 1109 #define OCFS2_LOCAL_QVERSIONS {\ 1110 0, \ 1111 0, \ 1112 } 1113 1114 /* Quota flags in dqinfo header */ 1115 #define OLQF_CLEAN 0x0001 /* Quota file is empty (this should be after\ 1116 * quota has been cleanly turned off) */ 1117 1118 #define OCFS2_LOCAL_INFO_OFF (sizeof(struct ocfs2_disk_dqheader)) 1119 1120 /* Information header of local quota file (immediately follows the generic 1121 * header) */ 1122 struct ocfs2_local_disk_dqinfo { 1123 __le32 dqi_flags; /* Flags for quota file */ 1124 __le32 dqi_chunks; /* Number of chunks of quota structures 1125 * with a bitmap */ 1126 __le32 dqi_blocks; /* Number of blocks allocated for quota file */ 1127 }; 1128 1129 /* Header of one chunk of a quota file */ 1130 struct ocfs2_local_disk_chunk { 1131 __le32 dqc_free; /* Number of free entries in the bitmap */ 1132 u8 dqc_bitmap[0]; /* Bitmap of entries in the corresponding 1133 * chunk of quota file */ 1134 }; 1135 1136 /* One entry in local quota file */ 1137 struct ocfs2_local_disk_dqblk { 1138 /*00*/ __le64 dqb_id; /* id this quota applies to */ 1139 __le64 dqb_spacemod; /* Change in the amount of used space */ 1140 /*10*/ __le64 dqb_inodemod; /* Change in the amount of used inodes */ 1141 }; 1142 1143 1144 /* 1145 * The quota trailer lives at the end of each quota block. 1146 */ 1147 1148 struct ocfs2_disk_dqtrailer { 1149 /*00*/ struct ocfs2_block_check dq_check; /* Error checking */ 1150 /*08*/ /* Cannot be larger than OCFS2_QBLK_RESERVED_SPACE */ 1151 }; 1152 1153 static inline struct ocfs2_disk_dqtrailer *ocfs2_block_dqtrailer(int blocksize, 1154 void *buf) 1155 { 1156 char *ptr = buf; 1157 ptr += blocksize - OCFS2_QBLK_RESERVED_SPACE; 1158 1159 return (struct ocfs2_disk_dqtrailer *)ptr; 1160 } 1161 1162 #ifdef __KERNEL__ 1163 static inline int ocfs2_fast_symlink_chars(struct super_block *sb) 1164 { 1165 return sb->s_blocksize - 1166 offsetof(struct ocfs2_dinode, id2.i_symlink); 1167 } 1168 1169 static inline int ocfs2_max_inline_data_with_xattr(struct super_block *sb, 1170 struct ocfs2_dinode *di) 1171 { 1172 unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size); 1173 1174 if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL) 1175 return sb->s_blocksize - 1176 offsetof(struct ocfs2_dinode, id2.i_data.id_data) - 1177 xattrsize; 1178 else 1179 return sb->s_blocksize - 1180 offsetof(struct ocfs2_dinode, id2.i_data.id_data); 1181 } 1182 1183 static inline int ocfs2_extent_recs_per_inode(struct super_block *sb) 1184 { 1185 int size; 1186 1187 size = sb->s_blocksize - 1188 offsetof(struct ocfs2_dinode, id2.i_list.l_recs); 1189 1190 return size / sizeof(struct ocfs2_extent_rec); 1191 } 1192 1193 static inline int ocfs2_extent_recs_per_inode_with_xattr( 1194 struct super_block *sb, 1195 struct ocfs2_dinode *di) 1196 { 1197 int size; 1198 unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size); 1199 1200 if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL) 1201 size = sb->s_blocksize - 1202 offsetof(struct ocfs2_dinode, id2.i_list.l_recs) - 1203 xattrsize; 1204 else 1205 size = sb->s_blocksize - 1206 offsetof(struct ocfs2_dinode, id2.i_list.l_recs); 1207 1208 return size / sizeof(struct ocfs2_extent_rec); 1209 } 1210 1211 static inline int ocfs2_extent_recs_per_dx_root(struct super_block *sb) 1212 { 1213 int size; 1214 1215 size = sb->s_blocksize - 1216 offsetof(struct ocfs2_dx_root_block, dr_list.l_recs); 1217 1218 return size / sizeof(struct ocfs2_extent_rec); 1219 } 1220 1221 static inline int ocfs2_chain_recs_per_inode(struct super_block *sb) 1222 { 1223 int size; 1224 1225 size = sb->s_blocksize - 1226 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs); 1227 1228 return size / sizeof(struct ocfs2_chain_rec); 1229 } 1230 1231 static inline u16 ocfs2_extent_recs_per_eb(struct super_block *sb) 1232 { 1233 int size; 1234 1235 size = sb->s_blocksize - 1236 offsetof(struct ocfs2_extent_block, h_list.l_recs); 1237 1238 return size / sizeof(struct ocfs2_extent_rec); 1239 } 1240 1241 static inline int ocfs2_dx_entries_per_leaf(struct super_block *sb) 1242 { 1243 int size; 1244 1245 size = sb->s_blocksize - 1246 offsetof(struct ocfs2_dx_leaf, dl_list.de_entries); 1247 1248 return size / sizeof(struct ocfs2_dx_entry); 1249 } 1250 1251 static inline int ocfs2_dx_entries_per_root(struct super_block *sb) 1252 { 1253 int size; 1254 1255 size = sb->s_blocksize - 1256 offsetof(struct ocfs2_dx_root_block, dr_entries.de_entries); 1257 1258 return size / sizeof(struct ocfs2_dx_entry); 1259 } 1260 1261 static inline u16 ocfs2_local_alloc_size(struct super_block *sb) 1262 { 1263 u16 size; 1264 1265 size = sb->s_blocksize - 1266 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap); 1267 1268 return size; 1269 } 1270 1271 static inline int ocfs2_group_bitmap_size(struct super_block *sb) 1272 { 1273 int size; 1274 1275 size = sb->s_blocksize - 1276 offsetof(struct ocfs2_group_desc, bg_bitmap); 1277 1278 return size; 1279 } 1280 1281 static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb) 1282 { 1283 int size; 1284 1285 size = sb->s_blocksize - 1286 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs); 1287 1288 return size / sizeof(struct ocfs2_truncate_rec); 1289 } 1290 1291 static inline u64 ocfs2_backup_super_blkno(struct super_block *sb, int index) 1292 { 1293 u64 offset = OCFS2_BACKUP_SB_START; 1294 1295 if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) { 1296 offset <<= (2 * index); 1297 offset >>= sb->s_blocksize_bits; 1298 return offset; 1299 } 1300 1301 return 0; 1302 1303 } 1304 1305 static inline u16 ocfs2_xattr_recs_per_xb(struct super_block *sb) 1306 { 1307 int size; 1308 1309 size = sb->s_blocksize - 1310 offsetof(struct ocfs2_xattr_block, 1311 xb_attrs.xb_root.xt_list.l_recs); 1312 1313 return size / sizeof(struct ocfs2_extent_rec); 1314 } 1315 #else 1316 static inline int ocfs2_fast_symlink_chars(int blocksize) 1317 { 1318 return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink); 1319 } 1320 1321 static inline int ocfs2_max_inline_data(int blocksize) 1322 { 1323 return blocksize - offsetof(struct ocfs2_dinode, id2.i_data.id_data); 1324 } 1325 1326 static inline int ocfs2_extent_recs_per_inode(int blocksize) 1327 { 1328 int size; 1329 1330 size = blocksize - 1331 offsetof(struct ocfs2_dinode, id2.i_list.l_recs); 1332 1333 return size / sizeof(struct ocfs2_extent_rec); 1334 } 1335 1336 static inline int ocfs2_chain_recs_per_inode(int blocksize) 1337 { 1338 int size; 1339 1340 size = blocksize - 1341 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs); 1342 1343 return size / sizeof(struct ocfs2_chain_rec); 1344 } 1345 1346 static inline int ocfs2_extent_recs_per_eb(int blocksize) 1347 { 1348 int size; 1349 1350 size = blocksize - 1351 offsetof(struct ocfs2_extent_block, h_list.l_recs); 1352 1353 return size / sizeof(struct ocfs2_extent_rec); 1354 } 1355 1356 static inline int ocfs2_local_alloc_size(int blocksize) 1357 { 1358 int size; 1359 1360 size = blocksize - 1361 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap); 1362 1363 return size; 1364 } 1365 1366 static inline int ocfs2_group_bitmap_size(int blocksize) 1367 { 1368 int size; 1369 1370 size = blocksize - 1371 offsetof(struct ocfs2_group_desc, bg_bitmap); 1372 1373 return size; 1374 } 1375 1376 static inline int ocfs2_truncate_recs_per_inode(int blocksize) 1377 { 1378 int size; 1379 1380 size = blocksize - 1381 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs); 1382 1383 return size / sizeof(struct ocfs2_truncate_rec); 1384 } 1385 1386 static inline uint64_t ocfs2_backup_super_blkno(int blocksize, int index) 1387 { 1388 uint64_t offset = OCFS2_BACKUP_SB_START; 1389 1390 if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) { 1391 offset <<= (2 * index); 1392 offset /= blocksize; 1393 return offset; 1394 } 1395 1396 return 0; 1397 } 1398 1399 static inline int ocfs2_xattr_recs_per_xb(int blocksize) 1400 { 1401 int size; 1402 1403 size = blocksize - 1404 offsetof(struct ocfs2_xattr_block, 1405 xb_attrs.xb_root.xt_list.l_recs); 1406 1407 return size / sizeof(struct ocfs2_extent_rec); 1408 } 1409 #endif /* __KERNEL__ */ 1410 1411 1412 static inline int ocfs2_system_inode_is_global(int type) 1413 { 1414 return ((type >= 0) && 1415 (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE)); 1416 } 1417 1418 static inline int ocfs2_sprintf_system_inode_name(char *buf, int len, 1419 int type, int slot) 1420 { 1421 int chars; 1422 1423 /* 1424 * Global system inodes can only have one copy. Everything 1425 * after OCFS2_LAST_GLOBAL_SYSTEM_INODE in the system inode 1426 * list has a copy per slot. 1427 */ 1428 if (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE) 1429 chars = snprintf(buf, len, "%s", 1430 ocfs2_system_inodes[type].si_name); 1431 else 1432 chars = snprintf(buf, len, 1433 ocfs2_system_inodes[type].si_name, 1434 slot); 1435 1436 return chars; 1437 } 1438 1439 static inline void ocfs2_set_de_type(struct ocfs2_dir_entry *de, 1440 umode_t mode) 1441 { 1442 de->file_type = ocfs2_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 1443 } 1444 1445 #endif /* _OCFS2_FS_H */ 1446 1447