1 /* 2 * linux/include/linux/ext2_fs.h 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/include/linux/minix_fs.h 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 */ 15 16 #ifndef _LINUX_EXT2_FS_H 17 #define _LINUX_EXT2_FS_H 18 19 #include <ext2fs/ext2_types.h> /* Changed from linux/types.h */ 20 21 /* 22 * The second extended filesystem constants/structures 23 */ 24 25 /* 26 * Define EXT2FS_DEBUG to produce debug messages 27 */ 28 #undef EXT2FS_DEBUG 29 30 /* 31 * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files 32 */ 33 #define EXT2_PREALLOCATE 34 #define EXT2_DEFAULT_PREALLOC_BLOCKS 8 35 36 /* 37 * The second extended file system version 38 */ 39 #define EXT2FS_DATE "95/08/09" 40 #define EXT2FS_VERSION "0.5b" 41 42 /* 43 * Special inode numbers 44 */ 45 #define EXT2_BAD_INO 1 /* Bad blocks inode */ 46 #define EXT2_ROOT_INO 2 /* Root inode */ 47 #define EXT2_ACL_IDX_INO 3 /* ACL inode */ 48 #define EXT2_ACL_DATA_INO 4 /* ACL inode */ 49 #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ 50 #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ 51 #define EXT2_RESIZE_INO 7 /* Reserved group descriptors inode */ 52 #define EXT2_JOURNAL_INO 8 /* Journal inode */ 53 54 /* First non-reserved inode for old ext2 filesystems */ 55 #define EXT2_GOOD_OLD_FIRST_INO 11 56 57 /* 58 * The second extended file system magic number 59 */ 60 #define EXT2_SUPER_MAGIC 0xEF53 61 62 #ifdef __KERNEL__ 63 #define EXT2_SB(sb) (&((sb)->u.ext2_sb)) 64 #else 65 /* Assume that user mode programs are passing in an ext2fs superblock, not 66 * a kernel struct super_block. This will allow us to call the feature-test 67 * macros from user land. */ 68 #define EXT2_SB(sb) (sb) 69 #endif 70 71 /* 72 * Maximal count of links to a file 73 */ 74 #define EXT2_LINK_MAX 65000 75 76 /* 77 * Macro-instructions used to manage several block sizes 78 */ 79 #define EXT2_MIN_BLOCK_LOG_SIZE 10 /* 1024 */ 80 #define EXT2_MAX_BLOCK_LOG_SIZE 16 /* 65536 */ 81 #define EXT2_MIN_BLOCK_SIZE (1 << EXT2_MIN_BLOCK_LOG_SIZE) 82 #define EXT2_MAX_BLOCK_SIZE (1 << EXT2_MAX_BLOCK_LOG_SIZE) 83 #ifdef __KERNEL__ 84 #define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) 85 #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 86 #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->addr_per_block_bits) 87 #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size) 88 #define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino) 89 #else 90 #define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size) 91 #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 92 #define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 93 EXT2_GOOD_OLD_INODE_SIZE : (s)->s_inode_size) 94 #define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 95 EXT2_GOOD_OLD_FIRST_INO : (s)->s_first_ino) 96 #endif 97 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof(__u32)) 98 99 /* 100 * Macro-instructions used to manage fragments 101 */ 102 #define EXT2_MIN_FRAG_SIZE EXT2_MIN_BLOCK_SIZE 103 #define EXT2_MAX_FRAG_SIZE EXT2_MAX_BLOCK_SIZE 104 #define EXT2_MIN_FRAG_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE 105 #ifdef __KERNEL__ 106 # define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->s_frag_size) 107 # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->s_frags_per_block) 108 #else 109 # define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size) 110 # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s)) 111 #endif 112 113 /* 114 * ACL structures 115 */ 116 struct ext2_acl_header /* Header of Access Control Lists */ 117 { 118 __u32 aclh_size; 119 __u32 aclh_file_count; 120 __u32 aclh_acle_count; 121 __u32 aclh_first_acle; 122 }; 123 124 struct ext2_acl_entry /* Access Control List Entry */ 125 { 126 __u32 acle_size; 127 __u16 acle_perms; /* Access permissions */ 128 __u16 acle_type; /* Type of entry */ 129 __u16 acle_tag; /* User or group identity */ 130 __u16 acle_pad1; 131 __u32 acle_next; /* Pointer on next entry for the */ 132 /* same inode or on next free entry */ 133 }; 134 135 /* 136 * Structure of a blocks group descriptor 137 */ 138 struct ext2_group_desc 139 { 140 __u32 bg_block_bitmap; /* Blocks bitmap block */ 141 __u32 bg_inode_bitmap; /* Inodes bitmap block */ 142 __u32 bg_inode_table; /* Inodes table block */ 143 __u16 bg_free_blocks_count; /* Free blocks count */ 144 __u16 bg_free_inodes_count; /* Free inodes count */ 145 __u16 bg_used_dirs_count; /* Directories count */ 146 __u16 bg_flags; 147 __u32 bg_reserved[2]; 148 __u16 bg_itable_unused; /* Unused inodes count */ 149 __u16 bg_checksum; /* crc16(s_uuid+grouo_num+group_desc)*/ 150 }; 151 152 struct ext4_group_desc 153 { 154 __u32 bg_block_bitmap; /* Blocks bitmap block */ 155 __u32 bg_inode_bitmap; /* Inodes bitmap block */ 156 __u32 bg_inode_table; /* Inodes table block */ 157 __u16 bg_free_blocks_count; /* Free blocks count */ 158 __u16 bg_free_inodes_count; /* Free inodes count */ 159 __u16 bg_used_dirs_count; /* Directories count */ 160 __u16 bg_flags; 161 __u32 bg_reserved[2]; 162 __u16 bg_itable_unused; /* Unused inodes count */ 163 __u16 bg_checksum; /* crc16(s_uuid+grouo_num+group_desc)*/ 164 __u32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 165 __u32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 166 __u32 bg_inode_table_hi; /* Inodes table block MSB */ 167 __u16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 168 __u16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 169 __u16 bg_used_dirs_count_hi; /* Directories count MSB */ 170 __u16 bg_pad; 171 __u32 bg_reserved2[3]; 172 }; 173 174 #define EXT2_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not initialized */ 175 #define EXT2_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not initialized */ 176 #define EXT2_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 177 178 /* 179 * Data structures used by the directory indexing feature 180 * 181 * Note: all of the multibyte integer fields are little endian. 182 */ 183 184 /* 185 * Note: dx_root_info is laid out so that if it should somehow get 186 * overlaid by a dirent the two low bits of the hash version will be 187 * zero. Therefore, the hash version mod 4 should never be 0. 188 * Sincerely, the paranoia department. 189 */ 190 struct ext2_dx_root_info { 191 __u32 reserved_zero; 192 __u8 hash_version; /* 0 now, 1 at release */ 193 __u8 info_length; /* 8 */ 194 __u8 indirect_levels; 195 __u8 unused_flags; 196 }; 197 198 #define EXT2_HASH_LEGACY 0 199 #define EXT2_HASH_HALF_MD4 1 200 #define EXT2_HASH_TEA 2 201 #define EXT2_HASH_LEGACY_UNSIGNED 3 /* reserved for userspace lib */ 202 #define EXT2_HASH_HALF_MD4_UNSIGNED 4 /* reserved for userspace lib */ 203 #define EXT2_HASH_TEA_UNSIGNED 5 /* reserved for userspace lib */ 204 205 #define EXT2_HASH_FLAG_INCOMPAT 0x1 206 207 struct ext2_dx_entry { 208 __u32 hash; 209 __u32 block; 210 }; 211 212 struct ext2_dx_countlimit { 213 __u16 limit; 214 __u16 count; 215 }; 216 217 218 /* 219 * Macro-instructions used to manage group descriptors 220 */ 221 #define EXT2_MIN_DESC_SIZE 32 222 #define EXT2_MIN_DESC_SIZE_64BIT 64 223 #define EXT2_MAX_DESC_SIZE EXT2_MIN_BLOCK_SIZE 224 #define EXT2_DESC_SIZE(s) \ 225 ((EXT2_SB(s)->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) ? \ 226 (s)->s_desc_size : EXT2_MIN_DESC_SIZE) 227 228 #define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 229 #define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 230 #define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s)) 231 /* limits imposed by 16-bit value gd_free_{blocks,inode}_count */ 232 #define EXT2_MAX_BLOCKS_PER_GROUP(s) ((1 << 16) - 8) 233 #define EXT2_MAX_INODES_PER_GROUP(s) ((1 << 16) - EXT2_INODES_PER_BLOCK(s)) 234 #ifdef __KERNEL__ 235 #define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) 236 #define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 237 #else 238 #define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_DESC_SIZE(s)) 239 #endif 240 241 /* 242 * Constants relative to the data blocks 243 */ 244 #define EXT2_NDIR_BLOCKS 12 245 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 246 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 247 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 248 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 249 250 /* 251 * Inode flags 252 */ 253 #define EXT2_SECRM_FL 0x00000001 /* Secure deletion */ 254 #define EXT2_UNRM_FL 0x00000002 /* Undelete */ 255 #define EXT2_COMPR_FL 0x00000004 /* Compress file */ 256 #define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */ 257 #define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */ 258 #define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */ 259 #define EXT2_NODUMP_FL 0x00000040 /* do not dump file */ 260 #define EXT2_NOATIME_FL 0x00000080 /* do not update atime */ 261 /* Reserved for compression usage... */ 262 #define EXT2_DIRTY_FL 0x00000100 263 #define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 264 #define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */ 265 #define EXT2_ECOMPR_FL 0x00000800 /* Compression error */ 266 /* End compression flags --- maybe not all used */ 267 #define EXT2_BTREE_FL 0x00001000 /* btree format dir */ 268 #define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */ 269 #define EXT2_IMAGIC_FL 0x00002000 270 #define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 271 #define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 272 #define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */ 273 #define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 274 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 275 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 276 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 277 #define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 278 279 #define EXT2_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 280 #define EXT2_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ 281 282 /* 283 * ioctl commands 284 */ 285 286 /* Used for online resize */ 287 struct ext2_new_group_input { 288 __u32 group; /* Group number for this data */ 289 __u32 block_bitmap; /* Absolute block number of block bitmap */ 290 __u32 inode_bitmap; /* Absolute block number of inode bitmap */ 291 __u32 inode_table; /* Absolute block number of inode table start */ 292 __u32 blocks_count; /* Total number of blocks in this group */ 293 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 294 __u16 unused; /* Number of reserved GDT blocks in group */ 295 }; 296 297 struct ext4_new_group_input { 298 __u32 group; /* Group number for this data */ 299 __u64 block_bitmap; /* Absolute block number of block bitmap */ 300 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 301 __u64 inode_table; /* Absolute block number of inode table start */ 302 __u32 blocks_count; /* Total number of blocks in this group */ 303 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 304 __u16 unused; 305 }; 306 307 #ifdef __GNU__ /* Needed for the Hurd */ 308 #define _IOT_ext2_new_group_input _IOT (_IOTS(__u32), 5, _IOTS(__u16), 2, 0, 0) 309 #endif 310 311 #define EXT2_IOC_GETFLAGS _IOR('f', 1, long) 312 #define EXT2_IOC_SETFLAGS _IOW('f', 2, long) 313 #define EXT2_IOC_GETVERSION _IOR('v', 1, long) 314 #define EXT2_IOC_SETVERSION _IOW('v', 2, long) 315 #define EXT2_IOC_GETVERSION_NEW _IOR('f', 3, long) 316 #define EXT2_IOC_SETVERSION_NEW _IOW('f', 4, long) 317 #define EXT2_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 318 #define EXT2_IOC_GROUP_ADD _IOW('f', 8,struct ext2_new_group_input) 319 #define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input) 320 321 /* 322 * Structure of an inode on the disk 323 */ 324 struct ext2_inode { 325 __u16 i_mode; /* File mode */ 326 __u16 i_uid; /* Low 16 bits of Owner Uid */ 327 __u32 i_size; /* Size in bytes */ 328 __u32 i_atime; /* Access time */ 329 __u32 i_ctime; /* Inode change time */ 330 __u32 i_mtime; /* Modification time */ 331 __u32 i_dtime; /* Deletion Time */ 332 __u16 i_gid; /* Low 16 bits of Group Id */ 333 __u16 i_links_count; /* Links count */ 334 __u32 i_blocks; /* Blocks count */ 335 __u32 i_flags; /* File flags */ 336 union { 337 struct { 338 __u32 l_i_version; /* was l_i_reserved1 */ 339 } linux1; 340 struct { 341 __u32 h_i_translator; 342 } hurd1; 343 } osd1; /* OS dependent 1 */ 344 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 345 __u32 i_generation; /* File version (for NFS) */ 346 __u32 i_file_acl; /* File ACL */ 347 __u32 i_dir_acl; /* Directory ACL */ 348 __u32 i_faddr; /* Fragment address */ 349 union { 350 struct { 351 __u16 l_i_blocks_hi; 352 __u16 l_i_file_acl_high; 353 __u16 l_i_uid_high; /* these 2 fields */ 354 __u16 l_i_gid_high; /* were reserved2[0] */ 355 __u32 l_i_reserved2; 356 } linux2; 357 struct { 358 __u8 h_i_frag; /* Fragment number */ 359 __u8 h_i_fsize; /* Fragment size */ 360 __u16 h_i_mode_high; 361 __u16 h_i_uid_high; 362 __u16 h_i_gid_high; 363 __u32 h_i_author; 364 } hurd2; 365 } osd2; /* OS dependent 2 */ 366 }; 367 368 /* 369 * Permanent part of an large inode on the disk 370 */ 371 struct ext2_inode_large { 372 __u16 i_mode; /* File mode */ 373 __u16 i_uid; /* Low 16 bits of Owner Uid */ 374 __u32 i_size; /* Size in bytes */ 375 __u32 i_atime; /* Access time */ 376 __u32 i_ctime; /* Inode Change time */ 377 __u32 i_mtime; /* Modification time */ 378 __u32 i_dtime; /* Deletion Time */ 379 __u16 i_gid; /* Low 16 bits of Group Id */ 380 __u16 i_links_count; /* Links count */ 381 __u32 i_blocks; /* Blocks count */ 382 __u32 i_flags; /* File flags */ 383 union { 384 struct { 385 __u32 l_i_version; /* was l_i_reserved1 */ 386 } linux1; 387 struct { 388 __u32 h_i_translator; 389 } hurd1; 390 } osd1; /* OS dependent 1 */ 391 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 392 __u32 i_generation; /* File version (for NFS) */ 393 __u32 i_file_acl; /* File ACL */ 394 __u32 i_dir_acl; /* Directory ACL */ 395 __u32 i_faddr; /* Fragment address */ 396 union { 397 struct { 398 __u16 l_i_blocks_hi; 399 __u16 l_i_file_acl_high; 400 __u16 l_i_uid_high; /* these 2 fields */ 401 __u16 l_i_gid_high; /* were reserved2[0] */ 402 __u32 l_i_reserved2; 403 } linux2; 404 struct { 405 __u8 h_i_frag; /* Fragment number */ 406 __u8 h_i_fsize; /* Fragment size */ 407 __u16 h_i_mode_high; 408 __u16 h_i_uid_high; 409 __u16 h_i_gid_high; 410 __u32 h_i_author; 411 } hurd2; 412 } osd2; /* OS dependent 2 */ 413 __u16 i_extra_isize; 414 __u16 i_pad1; 415 __u32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 416 __u32 i_mtime_extra; /* extra Modification time (nsec << 2 | epoch) */ 417 __u32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 418 __u32 i_crtime; /* File creation time */ 419 __u32 i_crtime_extra; /* extra File creation time (nsec << 2 | epoch)*/ 420 __u32 i_version_hi; /* high 32 bits for 64-bit version */ 421 }; 422 423 #define i_size_high i_dir_acl 424 425 #if defined(__KERNEL__) || defined(__linux__) 426 #define i_reserved1 osd1.linux1.l_i_reserved1 427 #define i_frag osd2.linux2.l_i_frag 428 #define i_fsize osd2.linux2.l_i_fsize 429 #define i_uid_low i_uid 430 #define i_gid_low i_gid 431 #define i_uid_high osd2.linux2.l_i_uid_high 432 #define i_gid_high osd2.linux2.l_i_gid_high 433 #define i_reserved2 osd2.linux2.l_i_reserved2 434 #else 435 #if defined(__GNU__) 436 437 #define i_translator osd1.hurd1.h_i_translator 438 #define i_frag osd2.hurd2.h_i_frag; 439 #define i_fsize osd2.hurd2.h_i_fsize; 440 #define i_uid_high osd2.hurd2.h_i_uid_high 441 #define i_gid_high osd2.hurd2.h_i_gid_high 442 #define i_author osd2.hurd2.h_i_author 443 444 #endif /* __GNU__ */ 445 #endif /* defined(__KERNEL__) || defined(__linux__) */ 446 447 #define inode_uid(inode) ((inode).i_uid | (inode).osd2.linux2.l_i_uid_high << 16) 448 #define inode_gid(inode) ((inode).i_gid | (inode).osd2.linux2.l_i_gid_high << 16) 449 #define ext2fs_set_i_uid_high(inode,x) ((inode).osd2.linux2.l_i_uid_high = (x)) 450 #define ext2fs_set_i_gid_high(inode,x) ((inode).osd2.linux2.l_i_gid_high = (x)) 451 452 /* 453 * File system states 454 */ 455 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 456 #define EXT2_ERROR_FS 0x0002 /* Errors detected */ 457 #define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */ 458 459 /* 460 * Misc. filesystem flags 461 */ 462 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 463 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 464 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* OK for use on development code */ 465 466 /* 467 * Mount flags 468 */ 469 #define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */ 470 #define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */ 471 #define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */ 472 #define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ 473 #define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ 474 #define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ 475 #define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */ 476 #define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */ 477 478 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 479 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt 480 #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 481 EXT2_MOUNT_##opt) 482 /* 483 * Maximal mount counts between two filesystem checks 484 */ 485 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 486 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 487 488 /* 489 * Behaviour when detecting errors 490 */ 491 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 492 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 493 #define EXT2_ERRORS_PANIC 3 /* Panic */ 494 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 495 496 /* 497 * Structure of the super block 498 */ 499 struct ext2_super_block { 500 __u32 s_inodes_count; /* Inodes count */ 501 __u32 s_blocks_count; /* Blocks count */ 502 __u32 s_r_blocks_count; /* Reserved blocks count */ 503 __u32 s_free_blocks_count; /* Free blocks count */ 504 __u32 s_free_inodes_count; /* Free inodes count */ 505 __u32 s_first_data_block; /* First Data Block */ 506 __u32 s_log_block_size; /* Block size */ 507 __s32 s_log_frag_size; /* Fragment size */ 508 __u32 s_blocks_per_group; /* # Blocks per group */ 509 __u32 s_frags_per_group; /* # Fragments per group */ 510 __u32 s_inodes_per_group; /* # Inodes per group */ 511 __u32 s_mtime; /* Mount time */ 512 __u32 s_wtime; /* Write time */ 513 __u16 s_mnt_count; /* Mount count */ 514 __s16 s_max_mnt_count; /* Maximal mount count */ 515 __u16 s_magic; /* Magic signature */ 516 __u16 s_state; /* File system state */ 517 __u16 s_errors; /* Behaviour when detecting errors */ 518 __u16 s_minor_rev_level; /* minor revision level */ 519 __u32 s_lastcheck; /* time of last check */ 520 __u32 s_checkinterval; /* max. time between checks */ 521 __u32 s_creator_os; /* OS */ 522 __u32 s_rev_level; /* Revision level */ 523 __u16 s_def_resuid; /* Default uid for reserved blocks */ 524 __u16 s_def_resgid; /* Default gid for reserved blocks */ 525 /* 526 * These fields are for EXT2_DYNAMIC_REV superblocks only. 527 * 528 * Note: the difference between the compatible feature set and 529 * the incompatible feature set is that if there is a bit set 530 * in the incompatible feature set that the kernel doesn't 531 * know about, it should refuse to mount the filesystem. 532 * 533 * e2fsck's requirements are more strict; if it doesn't know 534 * about a feature in either the compatible or incompatible 535 * feature set, it must abort and not try to meddle with 536 * things it doesn't understand... 537 */ 538 __u32 s_first_ino; /* First non-reserved inode */ 539 __u16 s_inode_size; /* size of inode structure */ 540 __u16 s_block_group_nr; /* block group # of this superblock */ 541 __u32 s_feature_compat; /* compatible feature set */ 542 __u32 s_feature_incompat; /* incompatible feature set */ 543 __u32 s_feature_ro_compat; /* readonly-compatible feature set */ 544 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 545 char s_volume_name[16]; /* volume name */ 546 char s_last_mounted[64]; /* directory where last mounted */ 547 __u32 s_algorithm_usage_bitmap; /* For compression */ 548 /* 549 * Performance hints. Directory preallocation should only 550 * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on. 551 */ 552 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 553 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 554 __u16 s_reserved_gdt_blocks; /* Per group table for online growth */ 555 /* 556 * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set. 557 */ 558 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 559 __u32 s_journal_inum; /* inode number of journal file */ 560 __u32 s_journal_dev; /* device number of journal file */ 561 __u32 s_last_orphan; /* start of list of inodes to delete */ 562 __u32 s_hash_seed[4]; /* HTREE hash seed */ 563 __u8 s_def_hash_version; /* Default hash version to use */ 564 __u8 s_jnl_backup_type; /* Default type of journal backup */ 565 __u16 s_desc_size; /* Group desc. size: INCOMPAT_64BIT */ 566 __u32 s_default_mount_opts; 567 __u32 s_first_meta_bg; /* First metablock group */ 568 __u32 s_mkfs_time; /* When the filesystem was created */ 569 __u32 s_jnl_blocks[17]; /* Backup of the journal inode */ 570 __u32 s_blocks_count_hi; /* Blocks count high 32bits */ 571 __u32 s_r_blocks_count_hi; /* Reserved blocks count high 32 bits*/ 572 __u32 s_free_blocks_hi; /* Free blocks count */ 573 __u16 s_min_extra_isize; /* All inodes have at least # bytes */ 574 __u16 s_want_extra_isize; /* New inodes should reserve # bytes */ 575 __u32 s_flags; /* Miscellaneous flags */ 576 __u16 s_raid_stride; /* RAID stride */ 577 __u16 s_mmp_interval; /* # seconds to wait in MMP checking */ 578 __u64 s_mmp_block; /* Block for multi-mount protection */ 579 __u32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 580 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 581 __u8 s_reserved_char_pad; 582 __u16 s_reserved_pad; /* Padding to next 32bits */ 583 __u64 s_kbytes_written; /* nr of lifetime kilobytes written */ 584 __u32 s_reserved[160]; /* Padding to the end of the block */ 585 }; 586 587 /* 588 * Codes for operating systems 589 */ 590 #define EXT2_OS_LINUX 0 591 #define EXT2_OS_HURD 1 592 #define EXT2_OBSO_OS_MASIX 2 593 #define EXT2_OS_FREEBSD 3 594 #define EXT2_OS_LITES 4 595 596 /* 597 * Revision levels 598 */ 599 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 600 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 601 602 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 603 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 604 605 #define EXT2_GOOD_OLD_INODE_SIZE 128 606 607 /* 608 * Journal inode backup types 609 */ 610 #define EXT3_JNL_BACKUP_BLOCKS 1 611 612 /* 613 * Feature set definitions 614 */ 615 616 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 617 ( EXT2_SB(sb)->s_feature_compat & (mask) ) 618 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 619 ( EXT2_SB(sb)->s_feature_ro_compat & (mask) ) 620 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 621 ( EXT2_SB(sb)->s_feature_incompat & (mask) ) 622 623 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 624 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 625 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 626 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 627 #define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010 628 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 629 #define EXT2_FEATURE_COMPAT_LAZY_BG 0x0040 630 631 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 632 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 633 /* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 not used */ 634 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 635 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 636 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 637 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 638 639 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 640 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 641 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 642 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 643 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 644 #define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040 645 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 646 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 647 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 648 649 650 #define EXT2_FEATURE_COMPAT_SUPP 0 651 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE) 652 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 653 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 654 EXT4_FEATURE_RO_COMPAT_DIR_NLINK| \ 655 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 656 657 /* 658 * Default values for user and/or group using reserved blocks 659 */ 660 #define EXT2_DEF_RESUID 0 661 #define EXT2_DEF_RESGID 0 662 663 /* 664 * Default mount options 665 */ 666 #define EXT2_DEFM_DEBUG 0x0001 667 #define EXT2_DEFM_BSDGROUPS 0x0002 668 #define EXT2_DEFM_XATTR_USER 0x0004 669 #define EXT2_DEFM_ACL 0x0008 670 #define EXT2_DEFM_UID16 0x0010 671 #define EXT3_DEFM_JMODE 0x0060 672 #define EXT3_DEFM_JMODE_DATA 0x0020 673 #define EXT3_DEFM_JMODE_ORDERED 0x0040 674 #define EXT3_DEFM_JMODE_WBACK 0x0060 675 676 /* 677 * Structure of a directory entry 678 */ 679 #define EXT2_NAME_LEN 255 680 681 struct ext2_dir_entry { 682 __u32 inode; /* Inode number */ 683 __u16 rec_len; /* Directory entry length */ 684 __u16 name_len; /* Name length */ 685 char name[EXT2_NAME_LEN]; /* File name */ 686 }; 687 688 /* 689 * The new version of the directory entry. Since EXT2 structures are 690 * stored in intel byte order, and the name_len field could never be 691 * bigger than 255 chars, it's safe to reclaim the extra byte for the 692 * file_type field. 693 */ 694 struct ext2_dir_entry_2 { 695 __u32 inode; /* Inode number */ 696 __u16 rec_len; /* Directory entry length */ 697 __u8 name_len; /* Name length */ 698 __u8 file_type; 699 char name[EXT2_NAME_LEN]; /* File name */ 700 }; 701 702 /* 703 * Ext2 directory file types. Only the low 3 bits are used. The 704 * other bits are reserved for now. 705 */ 706 #define EXT2_FT_UNKNOWN 0 707 #define EXT2_FT_REG_FILE 1 708 #define EXT2_FT_DIR 2 709 #define EXT2_FT_CHRDEV 3 710 #define EXT2_FT_BLKDEV 4 711 #define EXT2_FT_FIFO 5 712 #define EXT2_FT_SOCK 6 713 #define EXT2_FT_SYMLINK 7 714 715 #define EXT2_FT_MAX 8 716 717 /* 718 * EXT2_DIR_PAD defines the directory entries boundaries 719 * 720 * NOTE: It must be a multiple of 4 721 */ 722 #define EXT2_DIR_PAD 4 723 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 724 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 725 ~EXT2_DIR_ROUND) 726 727 /* 728 * This structure will be used for multiple mount protection. It will be 729 * written into the block number saved in the s_mmp_block field in the 730 * superblock. 731 */ 732 #define EXT2_MMP_MAGIC 0x004D4D50 /* ASCII for MMP */ 733 #define EXT2_MMP_CLEAN 0xFF4D4D50 /* Value of mmp_seq for clean unmount */ 734 #define EXT2_MMP_FSCK_ON 0xE24D4D50 /* Value of mmp_seq when being fscked */ 735 736 struct mmp_struct { 737 __u32 mmp_magic; 738 __u32 mmp_seq; 739 __u64 mmp_time; 740 char mmp_nodename[64]; 741 char mmp_bdevname[32]; 742 __u16 mmp_interval; 743 __u16 mmp_pad1; 744 __u32 mmp_pad2; 745 }; 746 747 /* 748 * Interval in number of seconds to update the MMP sequence number. 749 */ 750 #define EXT2_MMP_DEF_INTERVAL 5 751 752 #endif /* _LINUX_EXT2_FS_H */ 753