1 /* 2 * linux/include/linux/ext2_fs.h 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card (at) 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 #define EXT2_EXCLUDE_INO 9 /* The "exclude" inode, for snapshots */ 54 55 /* First non-reserved inode for old ext2 filesystems */ 56 #define EXT2_GOOD_OLD_FIRST_INO 11 57 58 /* 59 * The second extended file system magic number 60 */ 61 #define EXT2_SUPER_MAGIC 0xEF53 62 63 #ifdef __KERNEL__ 64 #define EXT2_SB(sb) (&((sb)->u.ext2_sb)) 65 #else 66 /* Assume that user mode programs are passing in an ext2fs superblock, not 67 * a kernel struct super_block. This will allow us to call the feature-test 68 * macros from user land. */ 69 #define EXT2_SB(sb) (sb) 70 #endif 71 72 /* 73 * Maximal count of links to a file 74 */ 75 #define EXT2_LINK_MAX 65000 76 77 /* 78 * Macro-instructions used to manage several block sizes 79 */ 80 #define EXT2_MIN_BLOCK_LOG_SIZE 10 /* 1024 */ 81 #define EXT2_MAX_BLOCK_LOG_SIZE 16 /* 65536 */ 82 #define EXT2_MIN_BLOCK_SIZE (1 << EXT2_MIN_BLOCK_LOG_SIZE) 83 #define EXT2_MAX_BLOCK_SIZE (1 << EXT2_MAX_BLOCK_LOG_SIZE) 84 #ifdef __KERNEL__ 85 #define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) 86 #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 87 #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->addr_per_block_bits) 88 #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size) 89 #define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino) 90 #else 91 #define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size) 92 #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 93 #define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 94 EXT2_GOOD_OLD_INODE_SIZE : (s)->s_inode_size) 95 #define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 96 EXT2_GOOD_OLD_FIRST_INO : (s)->s_first_ino) 97 #endif 98 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof(__u32)) 99 100 /* 101 * Macro-instructions used to manage fragments 102 */ 103 #define EXT2_MIN_FRAG_SIZE EXT2_MIN_BLOCK_SIZE 104 #define EXT2_MAX_FRAG_SIZE EXT2_MAX_BLOCK_SIZE 105 #define EXT2_MIN_FRAG_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE 106 #ifdef __KERNEL__ 107 # define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->s_frag_size) 108 # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->s_frags_per_block) 109 #else 110 # define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size) 111 # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s)) 112 #endif 113 114 /* 115 * ACL structures 116 */ 117 struct ext2_acl_header /* Header of Access Control Lists */ 118 { 119 __u32 aclh_size; 120 __u32 aclh_file_count; 121 __u32 aclh_acle_count; 122 __u32 aclh_first_acle; 123 }; 124 125 struct ext2_acl_entry /* Access Control List Entry */ 126 { 127 __u32 acle_size; 128 __u16 acle_perms; /* Access permissions */ 129 __u16 acle_type; /* Type of entry */ 130 __u16 acle_tag; /* User or group identity */ 131 __u16 acle_pad1; 132 __u32 acle_next; /* Pointer on next entry for the */ 133 /* same inode or on next free entry */ 134 }; 135 136 /* 137 * Structure of a blocks group descriptor 138 */ 139 struct ext2_group_desc 140 { 141 __u32 bg_block_bitmap; /* Blocks bitmap block */ 142 __u32 bg_inode_bitmap; /* Inodes bitmap block */ 143 __u32 bg_inode_table; /* Inodes table block */ 144 __u16 bg_free_blocks_count; /* Free blocks count */ 145 __u16 bg_free_inodes_count; /* Free inodes count */ 146 __u16 bg_used_dirs_count; /* Directories count */ 147 __u16 bg_flags; 148 __u32 bg_reserved[2]; 149 __u16 bg_itable_unused; /* Unused inodes count */ 150 __u16 bg_checksum; /* crc16(s_uuid+grouo_num+group_desc)*/ 151 }; 152 153 struct ext4_group_desc 154 { 155 __u32 bg_block_bitmap; /* Blocks bitmap block */ 156 __u32 bg_inode_bitmap; /* Inodes bitmap block */ 157 __u32 bg_inode_table; /* Inodes table block */ 158 __u16 bg_free_blocks_count; /* Free blocks count */ 159 __u16 bg_free_inodes_count; /* Free inodes count */ 160 __u16 bg_used_dirs_count; /* Directories count */ 161 __u16 bg_flags; 162 __u32 bg_reserved[2]; 163 __u16 bg_itable_unused; /* Unused inodes count */ 164 __u16 bg_checksum; /* crc16(s_uuid+grouo_num+group_desc)*/ 165 __u32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 166 __u32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 167 __u32 bg_inode_table_hi; /* Inodes table block MSB */ 168 __u16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 169 __u16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 170 __u16 bg_used_dirs_count_hi; /* Directories count MSB */ 171 __u16 bg_pad; 172 __u32 bg_reserved2[3]; 173 }; 174 175 #define EXT2_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not initialized */ 176 #define EXT2_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not initialized */ 177 #define EXT2_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 178 179 /* 180 * Data structures used by the directory indexing feature 181 * 182 * Note: all of the multibyte integer fields are little endian. 183 */ 184 185 /* 186 * Note: dx_root_info is laid out so that if it should somehow get 187 * overlaid by a dirent the two low bits of the hash version will be 188 * zero. Therefore, the hash version mod 4 should never be 0. 189 * Sincerely, the paranoia department. 190 */ 191 struct ext2_dx_root_info { 192 __u32 reserved_zero; 193 __u8 hash_version; /* 0 now, 1 at release */ 194 __u8 info_length; /* 8 */ 195 __u8 indirect_levels; 196 __u8 unused_flags; 197 }; 198 199 #define EXT2_HASH_LEGACY 0 200 #define EXT2_HASH_HALF_MD4 1 201 #define EXT2_HASH_TEA 2 202 #define EXT2_HASH_LEGACY_UNSIGNED 3 /* reserved for userspace lib */ 203 #define EXT2_HASH_HALF_MD4_UNSIGNED 4 /* reserved for userspace lib */ 204 #define EXT2_HASH_TEA_UNSIGNED 5 /* reserved for userspace lib */ 205 206 #define EXT2_HASH_FLAG_INCOMPAT 0x1 207 208 struct ext2_dx_entry { 209 __u32 hash; 210 __u32 block; 211 }; 212 213 struct ext2_dx_countlimit { 214 __u16 limit; 215 __u16 count; 216 }; 217 218 219 /* 220 * Macro-instructions used to manage group descriptors 221 */ 222 #define EXT2_MIN_DESC_SIZE 32 223 #define EXT2_MIN_DESC_SIZE_64BIT 64 224 #define EXT2_MAX_DESC_SIZE EXT2_MIN_BLOCK_SIZE 225 #define EXT2_DESC_SIZE(s) \ 226 ((EXT2_SB(s)->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) ? \ 227 (s)->s_desc_size : EXT2_MIN_DESC_SIZE) 228 229 #define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 230 #define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 231 #define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s)) 232 /* limits imposed by 16-bit value gd_free_{blocks,inode}_count */ 233 #define EXT2_MAX_BLOCKS_PER_GROUP(s) ((1 << 16) - 8) 234 #define EXT2_MAX_INODES_PER_GROUP(s) ((1 << 16) - EXT2_INODES_PER_BLOCK(s)) 235 #ifdef __KERNEL__ 236 #define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) 237 #define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 238 #else 239 #define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_DESC_SIZE(s)) 240 #endif 241 242 /* 243 * Constants relative to the data blocks 244 */ 245 #define EXT2_NDIR_BLOCKS 12 246 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 247 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 248 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 249 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 250 251 /* 252 * Inode flags 253 */ 254 #define EXT2_SECRM_FL 0x00000001 /* Secure deletion */ 255 #define EXT2_UNRM_FL 0x00000002 /* Undelete */ 256 #define EXT2_COMPR_FL 0x00000004 /* Compress file */ 257 #define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */ 258 #define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */ 259 #define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */ 260 #define EXT2_NODUMP_FL 0x00000040 /* do not dump file */ 261 #define EXT2_NOATIME_FL 0x00000080 /* do not update atime */ 262 /* Reserved for compression usage... */ 263 #define EXT2_DIRTY_FL 0x00000100 264 #define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 265 #define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */ 266 #define EXT2_ECOMPR_FL 0x00000800 /* Compression error */ 267 /* End compression flags --- maybe not all used */ 268 #define EXT2_BTREE_FL 0x00001000 /* btree format dir */ 269 #define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */ 270 #define EXT2_IMAGIC_FL 0x00002000 271 #define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 272 #define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 273 #define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */ 274 #define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 275 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 276 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 277 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 278 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 279 #define EXT4_SNAPFILE_FL 0x01000000 /* Inode is a snapshot */ 280 #define EXT4_SNAPFILE_DELETED_FL 0x04000000 /* Snapshot is being deleted */ 281 #define EXT4_SNAPFILE_SHRUNK_FL 0x08000000 /* Snapshot shrink has completed */ 282 #define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 283 284 #define EXT2_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 285 #define EXT2_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ 286 287 /* 288 * ioctl commands 289 */ 290 291 /* Used for online resize */ 292 struct ext2_new_group_input { 293 __u32 group; /* Group number for this data */ 294 __u32 block_bitmap; /* Absolute block number of block bitmap */ 295 __u32 inode_bitmap; /* Absolute block number of inode bitmap */ 296 __u32 inode_table; /* Absolute block number of inode table start */ 297 __u32 blocks_count; /* Total number of blocks in this group */ 298 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 299 __u16 unused; /* Number of reserved GDT blocks in group */ 300 }; 301 302 struct ext4_new_group_input { 303 __u32 group; /* Group number for this data */ 304 __u64 block_bitmap; /* Absolute block number of block bitmap */ 305 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 306 __u64 inode_table; /* Absolute block number of inode table start */ 307 __u32 blocks_count; /* Total number of blocks in this group */ 308 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 309 __u16 unused; 310 }; 311 312 #ifdef __GNU__ /* Needed for the Hurd */ 313 #define _IOT_ext2_new_group_input _IOT (_IOTS(__u32), 5, _IOTS(__u16), 2, 0, 0) 314 #endif 315 316 #define EXT2_IOC_GETFLAGS _IOR('f', 1, long) 317 #define EXT2_IOC_SETFLAGS _IOW('f', 2, long) 318 #define EXT2_IOC_GETVERSION _IOR('v', 1, long) 319 #define EXT2_IOC_SETVERSION _IOW('v', 2, long) 320 #define EXT2_IOC_GETVERSION_NEW _IOR('f', 3, long) 321 #define EXT2_IOC_SETVERSION_NEW _IOW('f', 4, long) 322 #define EXT2_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 323 #define EXT2_IOC_GROUP_ADD _IOW('f', 8,struct ext2_new_group_input) 324 #define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input) 325 326 /* 327 * Structure of an inode on the disk 328 */ 329 struct ext2_inode { 330 __u16 i_mode; /* File mode */ 331 __u16 i_uid; /* Low 16 bits of Owner Uid */ 332 __u32 i_size; /* Size in bytes */ 333 __u32 i_atime; /* Access time */ 334 __u32 i_ctime; /* Inode change time */ 335 __u32 i_mtime; /* Modification time */ 336 __u32 i_dtime; /* Deletion Time */ 337 __u16 i_gid; /* Low 16 bits of Group Id */ 338 __u16 i_links_count; /* Links count */ 339 __u32 i_blocks; /* Blocks count */ 340 __u32 i_flags; /* File flags */ 341 union { 342 struct { 343 __u32 l_i_version; /* was l_i_reserved1 */ 344 } linux1; 345 struct { 346 __u32 h_i_translator; 347 } hurd1; 348 } osd1; /* OS dependent 1 */ 349 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 350 __u32 i_generation; /* File version (for NFS) */ 351 __u32 i_file_acl; /* File ACL */ 352 __u32 i_dir_acl; /* Directory ACL */ 353 __u32 i_faddr; /* Fragment address */ 354 union { 355 struct { 356 __u16 l_i_blocks_hi; 357 __u16 l_i_file_acl_high; 358 __u16 l_i_uid_high; /* these 2 fields */ 359 __u16 l_i_gid_high; /* were reserved2[0] */ 360 __u32 l_i_reserved2; 361 } linux2; 362 struct { 363 __u8 h_i_frag; /* Fragment number */ 364 __u8 h_i_fsize; /* Fragment size */ 365 __u16 h_i_mode_high; 366 __u16 h_i_uid_high; 367 __u16 h_i_gid_high; 368 __u32 h_i_author; 369 } hurd2; 370 } osd2; /* OS dependent 2 */ 371 }; 372 373 /* 374 * Permanent part of an large inode on the disk 375 */ 376 struct ext2_inode_large { 377 __u16 i_mode; /* File mode */ 378 __u16 i_uid; /* Low 16 bits of Owner Uid */ 379 __u32 i_size; /* Size in bytes */ 380 __u32 i_atime; /* Access time */ 381 __u32 i_ctime; /* Inode Change time */ 382 __u32 i_mtime; /* Modification time */ 383 __u32 i_dtime; /* Deletion Time */ 384 __u16 i_gid; /* Low 16 bits of Group Id */ 385 __u16 i_links_count; /* Links count */ 386 __u32 i_blocks; /* Blocks count */ 387 __u32 i_flags; /* File flags */ 388 union { 389 struct { 390 __u32 l_i_version; /* was l_i_reserved1 */ 391 } linux1; 392 struct { 393 __u32 h_i_translator; 394 } hurd1; 395 } osd1; /* OS dependent 1 */ 396 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 397 __u32 i_generation; /* File version (for NFS) */ 398 __u32 i_file_acl; /* File ACL */ 399 __u32 i_dir_acl; /* Directory ACL */ 400 __u32 i_faddr; /* Fragment address */ 401 union { 402 struct { 403 __u16 l_i_blocks_hi; 404 __u16 l_i_file_acl_high; 405 __u16 l_i_uid_high; /* these 2 fields */ 406 __u16 l_i_gid_high; /* were reserved2[0] */ 407 __u32 l_i_reserved2; 408 } linux2; 409 struct { 410 __u8 h_i_frag; /* Fragment number */ 411 __u8 h_i_fsize; /* Fragment size */ 412 __u16 h_i_mode_high; 413 __u16 h_i_uid_high; 414 __u16 h_i_gid_high; 415 __u32 h_i_author; 416 } hurd2; 417 } osd2; /* OS dependent 2 */ 418 __u16 i_extra_isize; 419 __u16 i_pad1; 420 __u32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 421 __u32 i_mtime_extra; /* extra Modification time (nsec << 2 | epoch) */ 422 __u32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 423 __u32 i_crtime; /* File creation time */ 424 __u32 i_crtime_extra; /* extra File creation time (nsec << 2 | epoch)*/ 425 __u32 i_version_hi; /* high 32 bits for 64-bit version */ 426 }; 427 428 #define i_size_high i_dir_acl 429 430 #if defined(__KERNEL__) || defined(__linux__) 431 #define i_reserved1 osd1.linux1.l_i_reserved1 432 #define i_frag osd2.linux2.l_i_frag 433 #define i_fsize osd2.linux2.l_i_fsize 434 #define i_uid_low i_uid 435 #define i_gid_low i_gid 436 #define i_uid_high osd2.linux2.l_i_uid_high 437 #define i_gid_high osd2.linux2.l_i_gid_high 438 #define i_reserved2 osd2.linux2.l_i_reserved2 439 #else 440 #if defined(__GNU__) 441 442 #define i_translator osd1.hurd1.h_i_translator 443 #define i_frag osd2.hurd2.h_i_frag; 444 #define i_fsize osd2.hurd2.h_i_fsize; 445 #define i_uid_high osd2.hurd2.h_i_uid_high 446 #define i_gid_high osd2.hurd2.h_i_gid_high 447 #define i_author osd2.hurd2.h_i_author 448 449 #endif /* __GNU__ */ 450 #endif /* defined(__KERNEL__) || defined(__linux__) */ 451 452 #define inode_uid(inode) ((inode).i_uid | (inode).osd2.linux2.l_i_uid_high << 16) 453 #define inode_gid(inode) ((inode).i_gid | (inode).osd2.linux2.l_i_gid_high << 16) 454 #define ext2fs_set_i_uid_high(inode,x) ((inode).osd2.linux2.l_i_uid_high = (x)) 455 #define ext2fs_set_i_gid_high(inode,x) ((inode).osd2.linux2.l_i_gid_high = (x)) 456 457 /* 458 * File system states 459 */ 460 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 461 #define EXT2_ERROR_FS 0x0002 /* Errors detected */ 462 #define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */ 463 464 /* 465 * Misc. filesystem flags 466 */ 467 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 468 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 469 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* OK for use on development code */ 470 #define EXT2_FLAGS_IS_SNAPSHOT 0x0010 /* This is a snapshot image */ 471 #define EXT2_FLAGS_FIX_SNAPSHOT 0x0020 /* Snapshot inodes corrupted */ 472 #define EXT2_FLAGS_FIX_EXCLUDE 0x0040 /* Exclude bitmaps corrupted */ 473 474 /* 475 * Mount flags 476 */ 477 #define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */ 478 #define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */ 479 #define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */ 480 #define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ 481 #define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ 482 #define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ 483 #define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */ 484 #define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */ 485 486 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 487 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt 488 #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 489 EXT2_MOUNT_##opt) 490 /* 491 * Maximal mount counts between two filesystem checks 492 */ 493 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 494 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 495 496 /* 497 * Behaviour when detecting errors 498 */ 499 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 500 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 501 #define EXT2_ERRORS_PANIC 3 /* Panic */ 502 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 503 504 #if (__GNUC__ >= 4) 505 #define ext4_offsetof(TYPE,MEMBER) __builtin_offsetof(TYPE,MEMBER) 506 #else 507 #define ext4_offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) 508 #endif 509 510 /* 511 * Structure of the super block 512 */ 513 struct ext2_super_block { 514 __u32 s_inodes_count; /* Inodes count */ 515 __u32 s_blocks_count; /* Blocks count */ 516 __u32 s_r_blocks_count; /* Reserved blocks count */ 517 __u32 s_free_blocks_count; /* Free blocks count */ 518 __u32 s_free_inodes_count; /* Free inodes count */ 519 __u32 s_first_data_block; /* First Data Block */ 520 __u32 s_log_block_size; /* Block size */ 521 __s32 s_log_frag_size; /* Fragment size */ 522 __u32 s_blocks_per_group; /* # Blocks per group */ 523 __u32 s_frags_per_group; /* # Fragments per group */ 524 __u32 s_inodes_per_group; /* # Inodes per group */ 525 __u32 s_mtime; /* Mount time */ 526 __u32 s_wtime; /* Write time */ 527 __u16 s_mnt_count; /* Mount count */ 528 __s16 s_max_mnt_count; /* Maximal mount count */ 529 __u16 s_magic; /* Magic signature */ 530 __u16 s_state; /* File system state */ 531 __u16 s_errors; /* Behaviour when detecting errors */ 532 __u16 s_minor_rev_level; /* minor revision level */ 533 __u32 s_lastcheck; /* time of last check */ 534 __u32 s_checkinterval; /* max. time between checks */ 535 __u32 s_creator_os; /* OS */ 536 __u32 s_rev_level; /* Revision level */ 537 __u16 s_def_resuid; /* Default uid for reserved blocks */ 538 __u16 s_def_resgid; /* Default gid for reserved blocks */ 539 /* 540 * These fields are for EXT2_DYNAMIC_REV superblocks only. 541 * 542 * Note: the difference between the compatible feature set and 543 * the incompatible feature set is that if there is a bit set 544 * in the incompatible feature set that the kernel doesn't 545 * know about, it should refuse to mount the filesystem. 546 * 547 * e2fsck's requirements are more strict; if it doesn't know 548 * about a feature in either the compatible or incompatible 549 * feature set, it must abort and not try to meddle with 550 * things it doesn't understand... 551 */ 552 __u32 s_first_ino; /* First non-reserved inode */ 553 __u16 s_inode_size; /* size of inode structure */ 554 __u16 s_block_group_nr; /* block group # of this superblock */ 555 __u32 s_feature_compat; /* compatible feature set */ 556 __u32 s_feature_incompat; /* incompatible feature set */ 557 __u32 s_feature_ro_compat; /* readonly-compatible feature set */ 558 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 559 char s_volume_name[16]; /* volume name */ 560 char s_last_mounted[64]; /* directory where last mounted */ 561 __u32 s_algorithm_usage_bitmap; /* For compression */ 562 /* 563 * Performance hints. Directory preallocation should only 564 * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on. 565 */ 566 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 567 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 568 __u16 s_reserved_gdt_blocks; /* Per group table for online growth */ 569 /* 570 * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set. 571 */ 572 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 573 __u32 s_journal_inum; /* inode number of journal file */ 574 __u32 s_journal_dev; /* device number of journal file */ 575 __u32 s_last_orphan; /* start of list of inodes to delete */ 576 __u32 s_hash_seed[4]; /* HTREE hash seed */ 577 __u8 s_def_hash_version; /* Default hash version to use */ 578 __u8 s_jnl_backup_type; /* Default type of journal backup */ 579 __u16 s_desc_size; /* Group desc. size: INCOMPAT_64BIT */ 580 __u32 s_default_mount_opts; 581 __u32 s_first_meta_bg; /* First metablock group */ 582 __u32 s_mkfs_time; /* When the filesystem was created */ 583 __u32 s_jnl_blocks[17]; /* Backup of the journal inode */ 584 __u32 s_blocks_count_hi; /* Blocks count high 32bits */ 585 __u32 s_r_blocks_count_hi; /* Reserved blocks count high 32 bits*/ 586 __u32 s_free_blocks_hi; /* Free blocks count */ 587 __u16 s_min_extra_isize; /* All inodes have at least # bytes */ 588 __u16 s_want_extra_isize; /* New inodes should reserve # bytes */ 589 __u32 s_flags; /* Miscellaneous flags */ 590 __u16 s_raid_stride; /* RAID stride */ 591 __u16 s_mmp_interval; /* # seconds to wait in MMP checking */ 592 __u64 s_mmp_block; /* Block for multi-mount protection */ 593 __u32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 594 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 595 __u8 s_reserved_char_pad; 596 __u16 s_reserved_pad; /* Padding to next 32bits */ 597 __u64 s_kbytes_written; /* nr of lifetime kilobytes written */ 598 __u32 s_snapshot_inum; /* Inode number of active snapshot */ 599 __u32 s_snapshot_id; /* sequential ID of active snapshot */ 600 __u64 s_snapshot_r_blocks_count; /* reserved blocks for active 601 snapshot's future use */ 602 __u32 s_snapshot_list; /* inode number of the head of the on-disk snapshot list */ 603 #define EXT4_S_ERR_START ext4_offsetof(struct ext2_super_block, s_error_count) 604 __u32 s_error_count; /* number of fs errors */ 605 __u32 s_first_error_time; /* first time an error happened */ 606 __u32 s_first_error_ino; /* inode involved in first error */ 607 __u64 s_first_error_block; /* block involved of first error */ 608 __u8 s_first_error_func[32]; /* function where the error happened */ 609 __u32 s_first_error_line; /* line number where error happened */ 610 __u32 s_last_error_time; /* most recent time of an error */ 611 __u32 s_last_error_ino; /* inode involved in last error */ 612 __u32 s_last_error_line; /* line number where error happened */ 613 __u64 s_last_error_block; /* block involved of last error */ 614 __u8 s_last_error_func[32]; /* function where the error happened */ 615 #define EXT4_S_ERR_END ext4_offsetof(struct ext2_super_block, s_mount_opts) 616 __u8 s_mount_opts[64]; 617 __u32 s_reserved[112]; /* Padding to the end of the block */ 618 }; 619 620 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 621 622 /* 623 * Codes for operating systems 624 */ 625 #define EXT2_OS_LINUX 0 626 #define EXT2_OS_HURD 1 627 #define EXT2_OBSO_OS_MASIX 2 628 #define EXT2_OS_FREEBSD 3 629 #define EXT2_OS_LITES 4 630 631 /* 632 * Revision levels 633 */ 634 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 635 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 636 637 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 638 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 639 640 #define EXT2_GOOD_OLD_INODE_SIZE 128 641 642 /* 643 * Journal inode backup types 644 */ 645 #define EXT3_JNL_BACKUP_BLOCKS 1 646 647 /* 648 * Feature set definitions 649 */ 650 651 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 652 ( EXT2_SB(sb)->s_feature_compat & (mask) ) 653 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 654 ( EXT2_SB(sb)->s_feature_ro_compat & (mask) ) 655 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 656 ( EXT2_SB(sb)->s_feature_incompat & (mask) ) 657 658 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 659 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 660 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 661 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 662 #define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010 663 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 664 #define EXT2_FEATURE_COMPAT_LAZY_BG 0x0040 665 #define EXT2_FEATURE_COMPAT_EXCLUDE_INODE 0x0080 666 667 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 668 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 669 /* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 not used */ 670 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 671 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 672 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 673 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 674 #define EXT4_FEATURE_RO_COMPAT_HAS_SNAPSHOT 0x0080 675 676 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 677 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 678 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 679 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 680 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 681 #define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040 682 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 683 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 684 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 685 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 686 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 687 688 689 #define EXT2_FEATURE_COMPAT_SUPP 0 690 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE) 691 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 692 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 693 EXT4_FEATURE_RO_COMPAT_DIR_NLINK| \ 694 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 695 696 /* 697 * Default values for user and/or group using reserved blocks 698 */ 699 #define EXT2_DEF_RESUID 0 700 #define EXT2_DEF_RESGID 0 701 702 /* 703 * Default mount options 704 */ 705 #define EXT2_DEFM_DEBUG 0x0001 706 #define EXT2_DEFM_BSDGROUPS 0x0002 707 #define EXT2_DEFM_XATTR_USER 0x0004 708 #define EXT2_DEFM_ACL 0x0008 709 #define EXT2_DEFM_UID16 0x0010 710 #define EXT3_DEFM_JMODE 0x0060 711 #define EXT3_DEFM_JMODE_DATA 0x0020 712 #define EXT3_DEFM_JMODE_ORDERED 0x0040 713 #define EXT3_DEFM_JMODE_WBACK 0x0060 714 #define EXT4_DEFM_NOBARRIER 0x0100 715 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 716 #define EXT4_DEFM_DISCARD 0x0400 717 #define EXT4_DEFM_NODELALLOC 0x0800 718 719 /* 720 * Structure of a directory entry 721 */ 722 #define EXT2_NAME_LEN 255 723 724 struct ext2_dir_entry { 725 __u32 inode; /* Inode number */ 726 __u16 rec_len; /* Directory entry length */ 727 __u16 name_len; /* Name length */ 728 char name[EXT2_NAME_LEN]; /* File name */ 729 }; 730 731 /* 732 * The new version of the directory entry. Since EXT2 structures are 733 * stored in intel byte order, and the name_len field could never be 734 * bigger than 255 chars, it's safe to reclaim the extra byte for the 735 * file_type field. 736 */ 737 struct ext2_dir_entry_2 { 738 __u32 inode; /* Inode number */ 739 __u16 rec_len; /* Directory entry length */ 740 __u8 name_len; /* Name length */ 741 __u8 file_type; 742 char name[EXT2_NAME_LEN]; /* File name */ 743 }; 744 745 /* 746 * Ext2 directory file types. Only the low 3 bits are used. The 747 * other bits are reserved for now. 748 */ 749 #define EXT2_FT_UNKNOWN 0 750 #define EXT2_FT_REG_FILE 1 751 #define EXT2_FT_DIR 2 752 #define EXT2_FT_CHRDEV 3 753 #define EXT2_FT_BLKDEV 4 754 #define EXT2_FT_FIFO 5 755 #define EXT2_FT_SOCK 6 756 #define EXT2_FT_SYMLINK 7 757 758 #define EXT2_FT_MAX 8 759 760 /* 761 * EXT2_DIR_PAD defines the directory entries boundaries 762 * 763 * NOTE: It must be a multiple of 4 764 */ 765 #define EXT2_DIR_PAD 4 766 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 767 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 768 ~EXT2_DIR_ROUND) 769 770 /* 771 * This structure will be used for multiple mount protection. It will be 772 * written into the block number saved in the s_mmp_block field in the 773 * superblock. 774 */ 775 #define EXT2_MMP_MAGIC 0x004D4D50 /* ASCII for MMP */ 776 #define EXT2_MMP_CLEAN 0xFF4D4D50 /* Value of mmp_seq for clean unmount */ 777 #define EXT2_MMP_FSCK_ON 0xE24D4D50 /* Value of mmp_seq when being fscked */ 778 779 struct mmp_struct { 780 __u32 mmp_magic; 781 __u32 mmp_seq; 782 __u64 mmp_time; 783 char mmp_nodename[64]; 784 char mmp_bdevname[32]; 785 __u16 mmp_interval; 786 __u16 mmp_pad1; 787 __u32 mmp_pad2; 788 }; 789 790 /* 791 * Interval in number of seconds to update the MMP sequence number. 792 */ 793 #define EXT2_MMP_DEF_INTERVAL 5 794 795 #endif /* _LINUX_EXT2_FS_H */ 796
