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 #ifndef __GNUC_PREREQ 22 #if defined(__GNUC__) && defined(__GNUC_MINOR__) 23 #define __GNUC_PREREQ(maj, min) \ 24 ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) 25 #else 26 #define __GNUC_PREREQ(maj, min) 0 27 #endif 28 #endif 29 30 /* 31 * The second extended filesystem constants/structures 32 */ 33 34 /* 35 * Define EXT2FS_DEBUG to produce debug messages 36 */ 37 #undef EXT2FS_DEBUG 38 39 /* 40 * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files 41 */ 42 #define EXT2_PREALLOCATE 43 #define EXT2_DEFAULT_PREALLOC_BLOCKS 8 44 45 /* 46 * The second extended file system version 47 */ 48 #define EXT2FS_DATE "95/08/09" 49 #define EXT2FS_VERSION "0.5b" 50 51 /* 52 * Special inode numbers 53 */ 54 #define EXT2_BAD_INO 1 /* Bad blocks inode */ 55 #define EXT2_ROOT_INO 2 /* Root inode */ 56 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 57 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 58 #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ 59 #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ 60 #define EXT2_RESIZE_INO 7 /* Reserved group descriptors inode */ 61 #define EXT2_JOURNAL_INO 8 /* Journal inode */ 62 #define EXT2_EXCLUDE_INO 9 /* The "exclude" inode, for snapshots */ 63 #define EXT4_REPLICA_INO 10 /* Used by non-upstream feature */ 64 65 /* First non-reserved inode for old ext2 filesystems */ 66 #define EXT2_GOOD_OLD_FIRST_INO 11 67 68 /* 69 * The second extended file system magic number 70 */ 71 #define EXT2_SUPER_MAGIC 0xEF53 72 73 #ifdef __KERNEL__ 74 #define EXT2_SB(sb) (&((sb)->u.ext2_sb)) 75 #else 76 /* Assume that user mode programs are passing in an ext2fs superblock, not 77 * a kernel struct super_block. This will allow us to call the feature-test 78 * macros from user land. */ 79 #define EXT2_SB(sb) (sb) 80 #endif 81 82 /* 83 * Maximal count of links to a file 84 */ 85 #define EXT2_LINK_MAX 65000 86 87 /* 88 * Macro-instructions used to manage several block sizes 89 */ 90 #define EXT2_MIN_BLOCK_LOG_SIZE 10 /* 1024 */ 91 #define EXT2_MAX_BLOCK_LOG_SIZE 16 /* 65536 */ 92 #define EXT2_MIN_BLOCK_SIZE (1 << EXT2_MIN_BLOCK_LOG_SIZE) 93 #define EXT2_MAX_BLOCK_SIZE (1 << EXT2_MAX_BLOCK_LOG_SIZE) 94 #ifdef __KERNEL__ 95 #define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) 96 #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 97 #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->addr_per_block_bits) 98 #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size) 99 #define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino) 100 #else 101 #define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size) 102 #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 103 #define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 104 EXT2_GOOD_OLD_INODE_SIZE : (s)->s_inode_size) 105 #define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 106 EXT2_GOOD_OLD_FIRST_INO : (s)->s_first_ino) 107 #endif 108 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof(__u32)) 109 110 /* 111 * Macro-instructions used to manage allocation clusters 112 */ 113 #define EXT2_MIN_CLUSTER_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE 114 #define EXT2_MAX_CLUSTER_LOG_SIZE 29 /* 512MB */ 115 #define EXT2_MIN_CLUSTER_SIZE EXT2_MIN_BLOCK_SIZE 116 #define EXT2_MAX_CLUSTER_SIZE (1 << EXT2_MAX_CLUSTER_LOG_SIZE) 117 #define EXT2_CLUSTER_SIZE(s) (EXT2_MIN_BLOCK_SIZE << \ 118 (s)->s_log_cluster_size) 119 #define EXT2_CLUSTER_SIZE_BITS(s) ((s)->s_log_cluster_size + 10) 120 121 /* 122 * Macro-instructions used to manage fragments 123 * 124 * Note: for backwards compatibility only, for the dump program. 125 * Ext2/3/4 will never support fragments.... 126 */ 127 #define EXT2_MIN_FRAG_SIZE EXT2_MIN_BLOCK_SIZE 128 #define EXT2_MAX_FRAG_SIZE EXT2_MAX_BLOCK_SIZE 129 #define EXT2_MIN_FRAG_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE 130 #define EXT2_FRAG_SIZE(s) EXT2_BLOCK_SIZE(s) 131 #define EXT2_FRAGS_PER_BLOCK(s) 1 132 133 /* 134 * ACL structures 135 */ 136 struct ext2_acl_header /* Header of Access Control Lists */ 137 { 138 __u32 aclh_size; 139 __u32 aclh_file_count; 140 __u32 aclh_acle_count; 141 __u32 aclh_first_acle; 142 }; 143 144 struct ext2_acl_entry /* Access Control List Entry */ 145 { 146 __u32 acle_size; 147 __u16 acle_perms; /* Access permissions */ 148 __u16 acle_type; /* Type of entry */ 149 __u16 acle_tag; /* User or group identity */ 150 __u16 acle_pad1; 151 __u32 acle_next; /* Pointer on next entry for the */ 152 /* same inode or on next free entry */ 153 }; 154 155 /* 156 * Structure of a blocks group descriptor 157 */ 158 struct ext2_group_desc 159 { 160 __u32 bg_block_bitmap; /* Blocks bitmap block */ 161 __u32 bg_inode_bitmap; /* Inodes bitmap block */ 162 __u32 bg_inode_table; /* Inodes table block */ 163 __u16 bg_free_blocks_count; /* Free blocks count */ 164 __u16 bg_free_inodes_count; /* Free inodes count */ 165 __u16 bg_used_dirs_count; /* Directories count */ 166 __u16 bg_flags; 167 __u32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 168 __u16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */ 169 __u16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */ 170 __u16 bg_itable_unused; /* Unused inodes count */ 171 __u16 bg_checksum; /* crc16(s_uuid+group_num+group_desc)*/ 172 }; 173 174 /* 175 * Structure of a blocks group descriptor 176 */ 177 struct ext4_group_desc 178 { 179 __u32 bg_block_bitmap; /* Blocks bitmap block */ 180 __u32 bg_inode_bitmap; /* Inodes bitmap block */ 181 __u32 bg_inode_table; /* Inodes table block */ 182 __u16 bg_free_blocks_count; /* Free blocks count */ 183 __u16 bg_free_inodes_count; /* Free inodes count */ 184 __u16 bg_used_dirs_count; /* Directories count */ 185 __u16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 186 __u32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 187 __u16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */ 188 __u16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */ 189 __u16 bg_itable_unused; /* Unused inodes count */ 190 __u16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 191 __u32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 192 __u32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 193 __u32 bg_inode_table_hi; /* Inodes table block MSB */ 194 __u16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 195 __u16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 196 __u16 bg_used_dirs_count_hi; /* Directories count MSB */ 197 __u16 bg_itable_unused_hi; /* Unused inodes count MSB */ 198 __u32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 199 __u16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bitmap) MSB */ 200 __u16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bitmap) MSB */ 201 __u32 bg_reserved; 202 }; 203 204 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 205 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 206 sizeof(__u16)) 207 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_LOCATION \ 208 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 209 sizeof(__u16)) 210 211 #define EXT2_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not initialized */ 212 #define EXT2_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not initialized */ 213 #define EXT2_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 214 215 /* 216 * Data structures used by the directory indexing feature 217 * 218 * Note: all of the multibyte integer fields are little endian. 219 */ 220 221 /* 222 * Note: dx_root_info is laid out so that if it should somehow get 223 * overlaid by a dirent the two low bits of the hash version will be 224 * zero. Therefore, the hash version mod 4 should never be 0. 225 * Sincerely, the paranoia department. 226 */ 227 struct ext2_dx_root_info { 228 __u32 reserved_zero; 229 __u8 hash_version; /* 0 now, 1 at release */ 230 __u8 info_length; /* 8 */ 231 __u8 indirect_levels; 232 __u8 unused_flags; 233 }; 234 235 #define EXT2_HASH_LEGACY 0 236 #define EXT2_HASH_HALF_MD4 1 237 #define EXT2_HASH_TEA 2 238 #define EXT2_HASH_LEGACY_UNSIGNED 3 /* reserved for userspace lib */ 239 #define EXT2_HASH_HALF_MD4_UNSIGNED 4 /* reserved for userspace lib */ 240 #define EXT2_HASH_TEA_UNSIGNED 5 /* reserved for userspace lib */ 241 242 #define EXT2_HASH_FLAG_INCOMPAT 0x1 243 244 #define EXT4_DX_BLOCK_MASK 0x0fffffff 245 246 struct ext2_dx_entry { 247 __le32 hash; 248 __le32 block; 249 }; 250 251 struct ext2_dx_countlimit { 252 __le16 limit; 253 __le16 count; 254 }; 255 256 /* 257 * This goes at the end of each htree block. 258 */ 259 struct ext2_dx_tail { 260 __le32 dt_reserved; 261 __le32 dt_checksum; /* crc32c(uuid+inum+dxblock) */ 262 }; 263 264 /* 265 * Macro-instructions used to manage group descriptors 266 */ 267 #define EXT2_MIN_DESC_SIZE 32 268 #define EXT2_MIN_DESC_SIZE_64BIT 64 269 #define EXT2_MAX_DESC_SIZE EXT2_MIN_BLOCK_SIZE 270 #define EXT2_DESC_SIZE(s) \ 271 ((EXT2_SB(s)->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) ? \ 272 (s)->s_desc_size : EXT2_MIN_DESC_SIZE) 273 274 #define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 275 #define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 276 #define EXT2_CLUSTERS_PER_GROUP(s) (EXT2_SB(s)->s_clusters_per_group) 277 #define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s)) 278 /* limits imposed by 16-bit value gd_free_{blocks,inode}_count */ 279 #define EXT2_MAX_BLOCKS_PER_GROUP(s) ((((unsigned) 1 << 16) - 8) * \ 280 (EXT2_CLUSTER_SIZE(s) / \ 281 EXT2_BLOCK_SIZE(s))) 282 #define EXT2_MAX_CLUSTERS_PER_GROUP(s) (((unsigned) 1 << 16) - 8) 283 #define EXT2_MAX_INODES_PER_GROUP(s) (((unsigned) 1 << 16) - \ 284 EXT2_INODES_PER_BLOCK(s)) 285 #ifdef __KERNEL__ 286 #define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) 287 #define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 288 #else 289 #define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_DESC_SIZE(s)) 290 #endif 291 292 #define EXT2_GROUPS_TO_BLOCKS(s, g) ((blk64_t) EXT2_BLOCKS_PER_GROUP(s) * \ 293 (g)) 294 #define EXT2_GROUPS_TO_CLUSTERS(s, g) ((blk64_t) EXT2_CLUSTERS_PER_GROUP(s) * \ 295 (g)) 296 297 /* 298 * Constants relative to the data blocks 299 */ 300 #define EXT2_NDIR_BLOCKS 12 301 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 302 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 303 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 304 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 305 306 /* 307 * Inode flags 308 */ 309 #define EXT2_SECRM_FL 0x00000001 /* Secure deletion */ 310 #define EXT2_UNRM_FL 0x00000002 /* Undelete */ 311 #define EXT2_COMPR_FL 0x00000004 /* Compress file */ 312 #define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */ 313 #define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */ 314 #define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */ 315 #define EXT2_NODUMP_FL 0x00000040 /* do not dump file */ 316 #define EXT2_NOATIME_FL 0x00000080 /* do not update atime */ 317 /* Reserved for compression usage... */ 318 #define EXT2_DIRTY_FL 0x00000100 319 #define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 320 #define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */ 321 /* nb: was previously EXT2_ECOMPR_FL */ 322 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted inode */ 323 /* End compression flags --- maybe not all used */ 324 #define EXT2_BTREE_FL 0x00001000 /* btree format dir */ 325 #define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */ 326 #define EXT2_IMAGIC_FL 0x00002000 327 #define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 328 #define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 329 #define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */ 330 #define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 331 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 332 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 333 #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */ 334 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 335 /* EXT4_EOFBLOCKS_FL 0x00400000 was here */ 336 #define FS_NOCOW_FL 0x00800000 /* Do not cow file */ 337 #define EXT4_SNAPFILE_FL 0x01000000 /* Inode is a snapshot */ 338 #define EXT4_SNAPFILE_DELETED_FL 0x04000000 /* Snapshot is being deleted */ 339 #define EXT4_SNAPFILE_SHRUNK_FL 0x08000000 /* Snapshot shrink has completed */ 340 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data */ 341 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 342 #define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 343 344 #define EXT2_FL_USER_VISIBLE 0x204BDFFF /* User visible flags */ 345 #define EXT2_FL_USER_MODIFIABLE 0x204B80FF /* User modifiable flags */ 346 347 /* 348 * ioctl commands 349 */ 350 351 /* Used for online resize */ 352 struct ext2_new_group_input { 353 __u32 group; /* Group number for this data */ 354 __u32 block_bitmap; /* Absolute block number of block bitmap */ 355 __u32 inode_bitmap; /* Absolute block number of inode bitmap */ 356 __u32 inode_table; /* Absolute block number of inode table start */ 357 __u32 blocks_count; /* Total number of blocks in this group */ 358 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 359 __u16 unused; /* Number of reserved GDT blocks in group */ 360 }; 361 362 struct ext4_new_group_input { 363 __u32 group; /* Group number for this data */ 364 __u64 block_bitmap; /* Absolute block number of block bitmap */ 365 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 366 __u64 inode_table; /* Absolute block number of inode table start */ 367 __u32 blocks_count; /* Total number of blocks in this group */ 368 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 369 __u16 unused; 370 }; 371 372 #ifdef __GNU__ /* Needed for the Hurd */ 373 #define _IOT_ext2_new_group_input _IOT (_IOTS(__u32), 5, _IOTS(__u16), 2, 0, 0) 374 #endif 375 376 #define EXT2_IOC_GETFLAGS _IOR('f', 1, long) 377 #define EXT2_IOC_SETFLAGS _IOW('f', 2, long) 378 #define EXT2_IOC_GETVERSION _IOR('v', 1, long) 379 #define EXT2_IOC_SETVERSION _IOW('v', 2, long) 380 #define EXT2_IOC_GETVERSION_NEW _IOR('f', 3, long) 381 #define EXT2_IOC_SETVERSION_NEW _IOW('f', 4, long) 382 #define EXT2_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 383 #define EXT2_IOC_GROUP_ADD _IOW('f', 8,struct ext2_new_group_input) 384 #define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input) 385 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 386 387 /* 388 * Structure of an inode on the disk 389 */ 390 struct ext2_inode { 391 /*00*/ __u16 i_mode; /* File mode */ 392 __u16 i_uid; /* Low 16 bits of Owner Uid */ 393 __u32 i_size; /* Size in bytes */ 394 __u32 i_atime; /* Access time */ 395 __u32 i_ctime; /* Inode change time */ 396 /*10*/ __u32 i_mtime; /* Modification time */ 397 __u32 i_dtime; /* Deletion Time */ 398 __u16 i_gid; /* Low 16 bits of Group Id */ 399 __u16 i_links_count; /* Links count */ 400 __u32 i_blocks; /* Blocks count */ 401 /*20*/ __u32 i_flags; /* File flags */ 402 union { 403 struct { 404 __u32 l_i_version; /* was l_i_reserved1 */ 405 } linux1; 406 struct { 407 __u32 h_i_translator; 408 } hurd1; 409 } osd1; /* OS dependent 1 */ 410 /*28*/ __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 411 /*64*/ __u32 i_generation; /* File version (for NFS) */ 412 __u32 i_file_acl; /* File ACL */ 413 __u32 i_size_high; 414 /*70*/ __u32 i_faddr; /* Fragment address */ 415 union { 416 struct { 417 __u16 l_i_blocks_hi; 418 __u16 l_i_file_acl_high; 419 __u16 l_i_uid_high; /* these 2 fields */ 420 __u16 l_i_gid_high; /* were reserved2[0] */ 421 __u16 l_i_checksum_lo; /* crc32c(uuid+inum+inode) */ 422 __u16 l_i_reserved; 423 } linux2; 424 struct { 425 __u8 h_i_frag; /* Fragment number */ 426 __u8 h_i_fsize; /* Fragment size */ 427 __u16 h_i_mode_high; 428 __u16 h_i_uid_high; 429 __u16 h_i_gid_high; 430 __u32 h_i_author; 431 } hurd2; 432 } osd2; /* OS dependent 2 */ 433 }; 434 435 /* 436 * Permanent part of an large inode on the disk 437 */ 438 struct ext2_inode_large { 439 /*00*/ __u16 i_mode; /* File mode */ 440 __u16 i_uid; /* Low 16 bits of Owner Uid */ 441 __u32 i_size; /* Size in bytes */ 442 __u32 i_atime; /* Access time */ 443 __u32 i_ctime; /* Inode Change time */ 444 /*10*/ __u32 i_mtime; /* Modification time */ 445 __u32 i_dtime; /* Deletion Time */ 446 __u16 i_gid; /* Low 16 bits of Group Id */ 447 __u16 i_links_count; /* Links count */ 448 __u32 i_blocks; /* Blocks count */ 449 /*20*/ __u32 i_flags; /* File flags */ 450 union { 451 struct { 452 __u32 l_i_version; /* was l_i_reserved1 */ 453 } linux1; 454 struct { 455 __u32 h_i_translator; 456 } hurd1; 457 } osd1; /* OS dependent 1 */ 458 /*28*/ __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 459 /*64*/ __u32 i_generation; /* File version (for NFS) */ 460 __u32 i_file_acl; /* File ACL */ 461 __u32 i_size_high; 462 /*70*/ __u32 i_faddr; /* Fragment address */ 463 union { 464 struct { 465 __u16 l_i_blocks_hi; 466 __u16 l_i_file_acl_high; 467 __u16 l_i_uid_high; /* these 2 fields */ 468 __u16 l_i_gid_high; /* were reserved2[0] */ 469 __u16 l_i_checksum_lo; /* crc32c(uuid+inum+inode) */ 470 __u16 l_i_reserved; 471 } linux2; 472 struct { 473 __u8 h_i_frag; /* Fragment number */ 474 __u8 h_i_fsize; /* Fragment size */ 475 __u16 h_i_mode_high; 476 __u16 h_i_uid_high; 477 __u16 h_i_gid_high; 478 __u32 h_i_author; 479 } hurd2; 480 } osd2; /* OS dependent 2 */ 481 /*80*/ __u16 i_extra_isize; 482 __u16 i_checksum_hi; /* crc32c(uuid+inum+inode) */ 483 __u32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 484 __u32 i_mtime_extra; /* extra Modification time (nsec << 2 | epoch) */ 485 __u32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 486 /*90*/ __u32 i_crtime; /* File creation time */ 487 __u32 i_crtime_extra; /* extra File creation time (nsec << 2 | epoch)*/ 488 __u32 i_version_hi; /* high 32 bits for 64-bit version */ 489 /*9c*/ __u32 i_projid; /* Project ID */ 490 }; 491 492 #define EXT4_INODE_CSUM_HI_EXTRA_END \ 493 (offsetof(struct ext2_inode_large, i_checksum_hi) + sizeof(__u16) - \ 494 EXT2_GOOD_OLD_INODE_SIZE) 495 496 #define EXT4_EPOCH_BITS 2 497 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 498 499 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 500 501 #define inode_includes(size, field) \ 502 (size >= (sizeof(((struct ext2_inode_large *)0)->field) + \ 503 offsetof(struct ext2_inode_large, field))) 504 505 #if defined(__KERNEL__) || defined(__linux__) 506 #define i_reserved1 osd1.linux1.l_i_reserved1 507 #define i_frag osd2.linux2.l_i_frag 508 #define i_fsize osd2.linux2.l_i_fsize 509 #define i_uid_low i_uid 510 #define i_gid_low i_gid 511 #define i_uid_high osd2.linux2.l_i_uid_high 512 #define i_gid_high osd2.linux2.l_i_gid_high 513 #else 514 #if defined(__GNU__) 515 516 #define i_translator osd1.hurd1.h_i_translator 517 #define i_frag osd2.hurd2.h_i_frag; 518 #define i_fsize osd2.hurd2.h_i_fsize; 519 #define i_uid_high osd2.hurd2.h_i_uid_high 520 #define i_gid_high osd2.hurd2.h_i_gid_high 521 #define i_author osd2.hurd2.h_i_author 522 523 #endif /* __GNU__ */ 524 #endif /* defined(__KERNEL__) || defined(__linux__) */ 525 526 #define inode_uid(inode) ((inode).i_uid | (inode).osd2.linux2.l_i_uid_high << 16) 527 #define inode_gid(inode) ((inode).i_gid | (inode).osd2.linux2.l_i_gid_high << 16) 528 #define inode_projid(inode) ((inode).i_projid) 529 #define ext2fs_set_i_uid_high(inode,x) ((inode).osd2.linux2.l_i_uid_high = (x)) 530 #define ext2fs_set_i_gid_high(inode,x) ((inode).osd2.linux2.l_i_gid_high = (x)) 531 532 static inline 533 struct ext2_inode *EXT2_INODE(struct ext2_inode_large *large_inode) 534 { 535 return (struct ext2_inode *) large_inode; 536 } 537 538 /* 539 * File system states 540 */ 541 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 542 #define EXT2_ERROR_FS 0x0002 /* Errors detected */ 543 #define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */ 544 545 /* 546 * Misc. filesystem flags 547 */ 548 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 549 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 550 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* OK for use on development code */ 551 #define EXT2_FLAGS_IS_SNAPSHOT 0x0010 /* This is a snapshot image */ 552 #define EXT2_FLAGS_FIX_SNAPSHOT 0x0020 /* Snapshot inodes corrupted */ 553 #define EXT2_FLAGS_FIX_EXCLUDE 0x0040 /* Exclude bitmaps corrupted */ 554 555 /* 556 * Mount flags 557 */ 558 #define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */ 559 #define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */ 560 #define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */ 561 #define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ 562 #define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ 563 #define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ 564 #define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */ 565 #define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */ 566 567 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 568 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt 569 #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 570 EXT2_MOUNT_##opt) 571 /* 572 * Maximal mount counts between two filesystem checks 573 */ 574 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 575 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 576 577 /* 578 * Behaviour when detecting errors 579 */ 580 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 581 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 582 #define EXT2_ERRORS_PANIC 3 /* Panic */ 583 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 584 585 #if (__GNUC__ >= 4) 586 #define ext4_offsetof(TYPE,MEMBER) __builtin_offsetof(TYPE,MEMBER) 587 #else 588 #define ext4_offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) 589 #endif 590 591 /* Metadata checksum algorithms */ 592 #define EXT2_CRC32C_CHKSUM 1 593 594 /* Encryption algorithms, key size and key reference len */ 595 #define EXT4_ENCRYPTION_MODE_INVALID 0 596 #define EXT4_ENCRYPTION_MODE_AES_256_XTS 1 597 #define EXT4_ENCRYPTION_MODE_AES_256_GCM 2 598 #define EXT4_ENCRYPTION_MODE_AES_256_CBC 3 599 #define EXT4_ENCRYPTION_MODE_AES_256_CTS 4 600 601 #define EXT4_AES_256_XTS_KEY_SIZE 64 602 #define EXT4_AES_256_GCM_KEY_SIZE 32 603 #define EXT4_AES_256_CBC_KEY_SIZE 32 604 #define EXT4_AES_256_CTS_KEY_SIZE 32 605 #define EXT4_MAX_KEY_SIZE 64 606 607 #define EXT4_KEY_DESCRIPTOR_SIZE 8 608 #define EXT4_CRYPTO_BLOCK_SIZE 16 609 610 /* Password derivation constants */ 611 #define EXT4_MAX_PASSPHRASE_SIZE 1024 612 #define EXT4_MAX_SALT_SIZE 256 613 #define EXT4_PBKDF2_ITERATIONS 0xFFFF 614 615 #define EXT2_LABEL_LEN 16 616 617 /* 618 * Policy provided via an ioctl on the topmost directory. This 619 * structure is also in the kernel. 620 */ 621 struct ext4_encryption_policy { 622 char version; 623 char contents_encryption_mode; 624 char filenames_encryption_mode; 625 char flags; 626 char master_key_descriptor[EXT4_KEY_DESCRIPTOR_SIZE]; 627 } __attribute__((__packed__)); 628 629 struct ext4_encryption_key { 630 __u32 mode; 631 char raw[EXT4_MAX_KEY_SIZE]; 632 __u32 size; 633 } __attribute__((__packed__)); 634 635 /* 636 * Structure of the super block 637 */ 638 struct ext2_super_block { 639 /*000*/ __u32 s_inodes_count; /* Inodes count */ 640 __u32 s_blocks_count; /* Blocks count */ 641 __u32 s_r_blocks_count; /* Reserved blocks count */ 642 __u32 s_free_blocks_count; /* Free blocks count */ 643 /*010*/ __u32 s_free_inodes_count; /* Free inodes count */ 644 __u32 s_first_data_block; /* First Data Block */ 645 __u32 s_log_block_size; /* Block size */ 646 __u32 s_log_cluster_size; /* Allocation cluster size */ 647 /*020*/ __u32 s_blocks_per_group; /* # Blocks per group */ 648 __u32 s_clusters_per_group; /* # Fragments per group */ 649 __u32 s_inodes_per_group; /* # Inodes per group */ 650 __u32 s_mtime; /* Mount time */ 651 /*030*/ __u32 s_wtime; /* Write time */ 652 __u16 s_mnt_count; /* Mount count */ 653 __s16 s_max_mnt_count; /* Maximal mount count */ 654 __u16 s_magic; /* Magic signature */ 655 __u16 s_state; /* File system state */ 656 __u16 s_errors; /* Behaviour when detecting errors */ 657 __u16 s_minor_rev_level; /* minor revision level */ 658 /*040*/ __u32 s_lastcheck; /* time of last check */ 659 __u32 s_checkinterval; /* max. time between checks */ 660 __u32 s_creator_os; /* OS */ 661 __u32 s_rev_level; /* Revision level */ 662 /*050*/ __u16 s_def_resuid; /* Default uid for reserved blocks */ 663 __u16 s_def_resgid; /* Default gid for reserved blocks */ 664 /* 665 * These fields are for EXT2_DYNAMIC_REV superblocks only. 666 * 667 * Note: the difference between the compatible feature set and 668 * the incompatible feature set is that if there is a bit set 669 * in the incompatible feature set that the kernel doesn't 670 * know about, it should refuse to mount the filesystem. 671 * 672 * e2fsck's requirements are more strict; if it doesn't know 673 * about a feature in either the compatible or incompatible 674 * feature set, it must abort and not try to meddle with 675 * things it doesn't understand... 676 */ 677 __u32 s_first_ino; /* First non-reserved inode */ 678 __u16 s_inode_size; /* size of inode structure */ 679 __u16 s_block_group_nr; /* block group # of this superblock */ 680 __u32 s_feature_compat; /* compatible feature set */ 681 /*060*/ __u32 s_feature_incompat; /* incompatible feature set */ 682 __u32 s_feature_ro_compat; /* readonly-compatible feature set */ 683 /*068*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 684 /*078*/ char s_volume_name[EXT2_LABEL_LEN]; /* volume name */ 685 /*088*/ char s_last_mounted[64]; /* directory where last mounted */ 686 /*0c8*/ __u32 s_algorithm_usage_bitmap; /* For compression */ 687 /* 688 * Performance hints. Directory preallocation should only 689 * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on. 690 */ 691 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 692 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 693 __u16 s_reserved_gdt_blocks; /* Per group table for online growth */ 694 /* 695 * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set. 696 */ 697 /*0d0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 698 /*0e0*/ __u32 s_journal_inum; /* inode number of journal file */ 699 __u32 s_journal_dev; /* device number of journal file */ 700 __u32 s_last_orphan; /* start of list of inodes to delete */ 701 /*0ec*/ __u32 s_hash_seed[4]; /* HTREE hash seed */ 702 /*0fc*/ __u8 s_def_hash_version; /* Default hash version to use */ 703 __u8 s_jnl_backup_type; /* Default type of journal backup */ 704 __u16 s_desc_size; /* Group desc. size: INCOMPAT_64BIT */ 705 /*100*/ __u32 s_default_mount_opts; /* default EXT2_MOUNT_* flags used */ 706 __u32 s_first_meta_bg; /* First metablock group */ 707 __u32 s_mkfs_time; /* When the filesystem was created */ 708 /*10c*/ __u32 s_jnl_blocks[17]; /* Backup of the journal inode */ 709 /*150*/ __u32 s_blocks_count_hi; /* Blocks count high 32bits */ 710 __u32 s_r_blocks_count_hi; /* Reserved blocks count high 32 bits*/ 711 __u32 s_free_blocks_hi; /* Free blocks count */ 712 __u16 s_min_extra_isize; /* All inodes have at least # bytes */ 713 __u16 s_want_extra_isize; /* New inodes should reserve # bytes */ 714 /*160*/ __u32 s_flags; /* Miscellaneous flags */ 715 __u16 s_raid_stride; /* RAID stride in blocks */ 716 __u16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 717 __u64 s_mmp_block; /* Block for multi-mount protection */ 718 /*170*/ __u32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 719 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 720 __u8 s_checksum_type; /* metadata checksum algorithm */ 721 __u8 s_encryption_level; /* versioning level for encryption */ 722 __u8 s_reserved_pad; /* Padding to next 32bits */ 723 __u64 s_kbytes_written; /* nr of lifetime kilobytes written */ 724 /*180*/ __u32 s_snapshot_inum; /* Inode number of active snapshot */ 725 __u32 s_snapshot_id; /* sequential ID of active snapshot */ 726 __u64 s_snapshot_r_blocks_count; /* active snapshot reserved blocks */ 727 /*190*/ __u32 s_snapshot_list; /* inode number of disk snapshot list */ 728 #define EXT4_S_ERR_START ext4_offsetof(struct ext2_super_block, s_error_count) 729 __u32 s_error_count; /* number of fs errors */ 730 __u32 s_first_error_time; /* first time an error happened */ 731 __u32 s_first_error_ino; /* inode involved in first error */ 732 /*1a0*/ __u64 s_first_error_block; /* block involved in first error */ 733 __u8 s_first_error_func[32]; /* function where the error happened */ 734 /*1c8*/ __u32 s_first_error_line; /* line number where error happened */ 735 __u32 s_last_error_time; /* most recent time of an error */ 736 /*1d0*/ __u32 s_last_error_ino; /* inode involved in last error */ 737 __u32 s_last_error_line; /* line number where error happened */ 738 __u64 s_last_error_block; /* block involved of last error */ 739 /*1e0*/ __u8 s_last_error_func[32]; /* function where the error happened */ 740 #define EXT4_S_ERR_END ext4_offsetof(struct ext2_super_block, s_mount_opts) 741 /*200*/ __u8 s_mount_opts[64]; 742 /*240*/ __u32 s_usr_quota_inum; /* inode number of user quota file */ 743 __u32 s_grp_quota_inum; /* inode number of group quota file */ 744 __u32 s_overhead_blocks; /* overhead blocks/clusters in fs */ 745 /*24c*/ __u32 s_backup_bgs[2]; /* If sparse_super2 enabled */ 746 /*254*/ __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 747 /*258*/ __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 748 /*268*/ __le32 s_lpf_ino; /* Location of the lost+found inode */ 749 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 750 /*270*/ __le32 s_checksum_seed; /* crc32c(orig_uuid) if csum_seed set */ 751 __le32 s_reserved[98]; /* Padding to the end of the block */ 752 /*3fc*/ __u32 s_checksum; /* crc32c(superblock) */ 753 }; 754 755 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 756 757 /* 758 * Codes for operating systems 759 */ 760 #define EXT2_OS_LINUX 0 761 #define EXT2_OS_HURD 1 762 #define EXT2_OBSO_OS_MASIX 2 763 #define EXT2_OS_FREEBSD 3 764 #define EXT2_OS_LITES 4 765 766 /* 767 * Revision levels 768 */ 769 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 770 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 771 772 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 773 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 774 775 #define EXT2_GOOD_OLD_INODE_SIZE 128 776 777 /* 778 * Journal inode backup types 779 */ 780 #define EXT3_JNL_BACKUP_BLOCKS 1 781 782 /* 783 * Feature set definitions 784 */ 785 786 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 787 ( EXT2_SB(sb)->s_feature_compat & (mask) ) 788 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 789 ( EXT2_SB(sb)->s_feature_ro_compat & (mask) ) 790 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 791 ( EXT2_SB(sb)->s_feature_incompat & (mask) ) 792 793 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 794 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 795 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 796 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 797 #define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010 798 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 799 #define EXT2_FEATURE_COMPAT_LAZY_BG 0x0040 800 /* #define EXT2_FEATURE_COMPAT_EXCLUDE_INODE 0x0080 not used, legacy */ 801 #define EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP 0x0100 802 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 803 804 805 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 806 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 807 /* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 not used */ 808 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 809 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 810 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 811 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 812 #define EXT4_FEATURE_RO_COMPAT_HAS_SNAPSHOT 0x0080 813 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 814 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 815 /* 816 * METADATA_CSUM implies GDT_CSUM. When METADATA_CSUM is set, group 817 * descriptor checksums use the same algorithm as all other data 818 * structures' checksums. 819 */ 820 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 821 #define EXT4_FEATURE_RO_COMPAT_REPLICA 0x0800 822 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 823 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 /* Project quota */ 824 #define EXT4_FEATURE_RO_COMPAT_SHARED_BLOCKS 0x4000 825 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000 826 827 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 828 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 829 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 830 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 831 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 832 #define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040 833 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 834 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 835 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 836 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 837 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 838 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 839 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 840 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 841 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 842 843 #define EXT4_FEATURE_COMPAT_FUNCS(name, ver, flagname) \ 844 static inline int ext2fs_has_feature_##name(struct ext2_super_block *sb) \ 845 { \ 846 return ((EXT2_SB(sb)->s_feature_compat & \ 847 EXT##ver##_FEATURE_COMPAT_##flagname) != 0); \ 848 } \ 849 static inline void ext2fs_set_feature_##name(struct ext2_super_block *sb) \ 850 { \ 851 EXT2_SB(sb)->s_feature_compat |= \ 852 EXT##ver##_FEATURE_COMPAT_##flagname; \ 853 } \ 854 static inline void ext2fs_clear_feature_##name(struct ext2_super_block *sb) \ 855 { \ 856 EXT2_SB(sb)->s_feature_compat &= \ 857 ~EXT##ver##_FEATURE_COMPAT_##flagname; \ 858 } 859 860 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, ver, flagname) \ 861 static inline int ext2fs_has_feature_##name(struct ext2_super_block *sb) \ 862 { \ 863 return ((EXT2_SB(sb)->s_feature_ro_compat & \ 864 EXT##ver##_FEATURE_RO_COMPAT_##flagname) != 0); \ 865 } \ 866 static inline void ext2fs_set_feature_##name(struct ext2_super_block *sb) \ 867 { \ 868 EXT2_SB(sb)->s_feature_ro_compat |= \ 869 EXT##ver##_FEATURE_RO_COMPAT_##flagname; \ 870 } \ 871 static inline void ext2fs_clear_feature_##name(struct ext2_super_block *sb) \ 872 { \ 873 EXT2_SB(sb)->s_feature_ro_compat &= \ 874 ~EXT##ver##_FEATURE_RO_COMPAT_##flagname; \ 875 } 876 877 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, ver, flagname) \ 878 static inline int ext2fs_has_feature_##name(struct ext2_super_block *sb) \ 879 { \ 880 return ((EXT2_SB(sb)->s_feature_incompat & \ 881 EXT##ver##_FEATURE_INCOMPAT_##flagname) != 0); \ 882 } \ 883 static inline void ext2fs_set_feature_##name(struct ext2_super_block *sb) \ 884 { \ 885 EXT2_SB(sb)->s_feature_incompat |= \ 886 EXT##ver##_FEATURE_INCOMPAT_##flagname; \ 887 } \ 888 static inline void ext2fs_clear_feature_##name(struct ext2_super_block *sb) \ 889 { \ 890 EXT2_SB(sb)->s_feature_incompat &= \ 891 ~EXT##ver##_FEATURE_INCOMPAT_##flagname; \ 892 } 893 894 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, 2, DIR_PREALLOC) 895 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, 2, IMAGIC_INODES) 896 EXT4_FEATURE_COMPAT_FUNCS(journal, 3, HAS_JOURNAL) 897 EXT4_FEATURE_COMPAT_FUNCS(xattr, 2, EXT_ATTR) 898 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, 2, RESIZE_INODE) 899 EXT4_FEATURE_COMPAT_FUNCS(dir_index, 2, DIR_INDEX) 900 EXT4_FEATURE_COMPAT_FUNCS(lazy_bg, 2, LAZY_BG) 901 EXT4_FEATURE_COMPAT_FUNCS(exclude_bitmap, 2, EXCLUDE_BITMAP) 902 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, 4, SPARSE_SUPER2) 903 904 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, 2, SPARSE_SUPER) 905 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, 2, LARGE_FILE) 906 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, 4, HUGE_FILE) 907 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, 4, GDT_CSUM) 908 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, 4, DIR_NLINK) 909 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, 4, EXTRA_ISIZE) 910 EXT4_FEATURE_RO_COMPAT_FUNCS(has_snapshot, 4, HAS_SNAPSHOT) 911 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, 4, QUOTA) 912 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, 4, BIGALLOC) 913 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, 4, METADATA_CSUM) 914 EXT4_FEATURE_RO_COMPAT_FUNCS(replica, 4, REPLICA) 915 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, 4, READONLY) 916 EXT4_FEATURE_RO_COMPAT_FUNCS(project, 4, PROJECT) 917 EXT4_FEATURE_RO_COMPAT_FUNCS(shared_blocks, 4, SHARED_BLOCKS) 918 EXT4_FEATURE_RO_COMPAT_FUNCS(verity, 4, VERITY) 919 920 EXT4_FEATURE_INCOMPAT_FUNCS(compression, 2, COMPRESSION) 921 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, 2, FILETYPE) 922 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, 3, RECOVER) 923 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, 3, JOURNAL_DEV) 924 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, 2, META_BG) 925 EXT4_FEATURE_INCOMPAT_FUNCS(extents, 3, EXTENTS) 926 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 4, 64BIT) 927 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, 4, MMP) 928 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, 4, FLEX_BG) 929 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, 4, EA_INODE) 930 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, 4, DIRDATA) 931 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, 4, CSUM_SEED) 932 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, 4, LARGEDIR) 933 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, 4, INLINE_DATA) 934 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, 4, ENCRYPT) 935 936 #define EXT2_FEATURE_COMPAT_SUPP 0 937 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ 938 EXT4_FEATURE_INCOMPAT_MMP| \ 939 EXT4_FEATURE_INCOMPAT_LARGEDIR| \ 940 EXT4_FEATURE_INCOMPAT_EA_INODE) 941 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 942 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 943 EXT4_FEATURE_RO_COMPAT_DIR_NLINK| \ 944 EXT2_FEATURE_RO_COMPAT_BTREE_DIR| \ 945 EXT4_FEATURE_RO_COMPAT_VERITY) 946 947 /* 948 * Default values for user and/or group using reserved blocks 949 */ 950 #define EXT2_DEF_RESUID 0 951 #define EXT2_DEF_RESGID 0 952 953 /* 954 * Default mount options 955 */ 956 #define EXT2_DEFM_DEBUG 0x0001 957 #define EXT2_DEFM_BSDGROUPS 0x0002 958 #define EXT2_DEFM_XATTR_USER 0x0004 959 #define EXT2_DEFM_ACL 0x0008 960 #define EXT2_DEFM_UID16 0x0010 961 #define EXT3_DEFM_JMODE 0x0060 962 #define EXT3_DEFM_JMODE_DATA 0x0020 963 #define EXT3_DEFM_JMODE_ORDERED 0x0040 964 #define EXT3_DEFM_JMODE_WBACK 0x0060 965 #define EXT4_DEFM_NOBARRIER 0x0100 966 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 967 #define EXT4_DEFM_DISCARD 0x0400 968 #define EXT4_DEFM_NODELALLOC 0x0800 969 970 /* 971 * Structure of a directory entry 972 */ 973 #define EXT2_NAME_LEN 255 974 975 struct ext2_dir_entry { 976 __u32 inode; /* Inode number */ 977 __u16 rec_len; /* Directory entry length */ 978 __u16 name_len; /* Name length */ 979 char name[EXT2_NAME_LEN]; /* File name */ 980 }; 981 982 /* 983 * The new version of the directory entry. Since EXT2 structures are 984 * stored in intel byte order, and the name_len field could never be 985 * bigger than 255 chars, it's safe to reclaim the extra byte for the 986 * file_type field. 987 * 988 * This structure is deprecated due to endian issues. Please use struct 989 * ext2_dir_entry and accessor functions 990 * ext2fs_dirent_name_len 991 * ext2fs_dirent_set_name_len 992 * ext2fs_dirent_file_type 993 * ext2fs_dirent_set_file_type 994 * to get and set name_len and file_type fields. 995 */ 996 struct ext2_dir_entry_2 { 997 __u32 inode; /* Inode number */ 998 __u16 rec_len; /* Directory entry length */ 999 __u8 name_len; /* Name length */ 1000 __u8 file_type; 1001 char name[EXT2_NAME_LEN]; /* File name */ 1002 }; 1003 1004 /* 1005 * This is a bogus directory entry at the end of each leaf block that 1006 * records checksums. 1007 */ 1008 struct ext2_dir_entry_tail { 1009 __u32 det_reserved_zero1; /* Pretend to be unused */ 1010 __u16 det_rec_len; /* 12 */ 1011 __u16 det_reserved_name_len; /* 0xDE00, fake namelen/filetype */ 1012 __u32 det_checksum; /* crc32c(uuid+inode+dirent) */ 1013 }; 1014 1015 /* 1016 * Ext2 directory file types. Only the low 3 bits are used. The 1017 * other bits are reserved for now. 1018 */ 1019 #define EXT2_FT_UNKNOWN 0 1020 #define EXT2_FT_REG_FILE 1 1021 #define EXT2_FT_DIR 2 1022 #define EXT2_FT_CHRDEV 3 1023 #define EXT2_FT_BLKDEV 4 1024 #define EXT2_FT_FIFO 5 1025 #define EXT2_FT_SOCK 6 1026 #define EXT2_FT_SYMLINK 7 1027 1028 #define EXT2_FT_MAX 8 1029 1030 /* 1031 * Annoyingly, e2fsprogs always swab16s ext2_dir_entry.name_len, so we 1032 * have to build ext2_dir_entry_tail with that assumption too. This 1033 * constant helps to build the dir_entry_tail to look like it has an 1034 * "invalid" file type. 1035 */ 1036 #define EXT2_DIR_NAME_LEN_CSUM 0xDE00 1037 1038 /* 1039 * EXT2_DIR_PAD defines the directory entries boundaries 1040 * 1041 * NOTE: It must be a multiple of 4 1042 */ 1043 #define EXT2_DIR_ENTRY_HEADER_LEN 8 1044 #define EXT2_DIR_PAD 4 1045 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 1046 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + \ 1047 EXT2_DIR_ENTRY_HEADER_LEN + \ 1048 EXT2_DIR_ROUND) & \ 1049 ~EXT2_DIR_ROUND) 1050 1051 /* 1052 * Constants for ext4's extended time encoding 1053 */ 1054 #define EXT4_EPOCH_BITS 2 1055 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 1056 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 1057 1058 /* 1059 * This structure is used for multiple mount protection. It is written 1060 * into the block number saved in the s_mmp_block field in the superblock. 1061 * Programs that check MMP should assume that if SEQ_FSCK (or any unknown 1062 * code above SEQ_MAX) is present then it is NOT safe to use the filesystem, 1063 * regardless of how old the timestamp is. 1064 * 1065 * The timestamp in the MMP structure will be updated by e2fsck at some 1066 * arbitrary intervals (start of passes, after every few groups of inodes 1067 * in pass1 and pass1b). There is no guarantee that e2fsck is updating 1068 * the MMP block in a timely manner, and the updates it does are purely 1069 * for the convenience of the sysadmin and not for automatic validation. 1070 * 1071 * Note: Only the mmp_seq value is used to determine whether the MMP block 1072 * is being updated. The mmp_time, mmp_nodename, and mmp_bdevname 1073 * fields are only for informational purposes for the administrator, 1074 * due to clock skew between nodes and hostname HA service takeover. 1075 */ 1076 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 1077 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 1078 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 1079 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 1080 1081 /* Not endian-annotated; it's swapped at read/write time */ 1082 struct mmp_struct { 1083 __u32 mmp_magic; /* Magic number for MMP */ 1084 __u32 mmp_seq; /* Sequence no. updated periodically */ 1085 __u64 mmp_time; /* Time last updated */ 1086 char mmp_nodename[64]; /* Node which last updated MMP block */ 1087 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 1088 __u16 mmp_check_interval; /* Changed mmp_check_interval */ 1089 __u16 mmp_pad1; 1090 __u32 mmp_pad2[226]; 1091 __u32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 1092 }; 1093 1094 /* 1095 * Default interval for MMP update in seconds. 1096 */ 1097 #define EXT4_MMP_UPDATE_INTERVAL 5 1098 1099 /* 1100 * Maximum interval for MMP update in seconds. 1101 */ 1102 #define EXT4_MMP_MAX_UPDATE_INTERVAL 300 1103 1104 /* 1105 * Minimum interval for MMP checking in seconds. 1106 */ 1107 #define EXT4_MMP_MIN_CHECK_INTERVAL 5 1108 1109 /* 1110 * Minimum size of inline data. 1111 */ 1112 #define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__u32) * EXT2_N_BLOCKS)) 1113 1114 /* 1115 * Size of a parent inode in inline data directory. 1116 */ 1117 #define EXT4_INLINE_DATA_DOTDOT_SIZE (4) 1118 1119 #endif /* _LINUX_EXT2_FS_H */ 1120
