ext2_fs.h revision e0ed7404719a9ddd2ba427a80db5365c8bad18c0
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 EXT4_USR_QUOTA_INO 3 /* User quota inode */ 48#define EXT4_GRP_QUOTA_INO 4 /* Group quota 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#define EXT4_REPLICA_INO 10 /* Used by non-upstream feature */ 55 56/* First non-reserved inode for old ext2 filesystems */ 57#define EXT2_GOOD_OLD_FIRST_INO 11 58 59/* 60 * The second extended file system magic number 61 */ 62#define EXT2_SUPER_MAGIC 0xEF53 63 64#ifdef __KERNEL__ 65#define EXT2_SB(sb) (&((sb)->u.ext2_sb)) 66#else 67/* Assume that user mode programs are passing in an ext2fs superblock, not 68 * a kernel struct super_block. This will allow us to call the feature-test 69 * macros from user land. */ 70#define EXT2_SB(sb) (sb) 71#endif 72 73/* 74 * Maximal count of links to a file 75 */ 76#define EXT2_LINK_MAX 65000 77 78/* 79 * Macro-instructions used to manage several block sizes 80 */ 81#define EXT2_MIN_BLOCK_LOG_SIZE 10 /* 1024 */ 82#define EXT2_MAX_BLOCK_LOG_SIZE 16 /* 65536 */ 83#define EXT2_MIN_BLOCK_SIZE (1 << EXT2_MIN_BLOCK_LOG_SIZE) 84#define EXT2_MAX_BLOCK_SIZE (1 << EXT2_MAX_BLOCK_LOG_SIZE) 85#ifdef __KERNEL__ 86#define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) 87#define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 88#define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->addr_per_block_bits) 89#define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size) 90#define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino) 91#else 92#define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size) 93#define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 94#define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 95 EXT2_GOOD_OLD_INODE_SIZE : (s)->s_inode_size) 96#define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 97 EXT2_GOOD_OLD_FIRST_INO : (s)->s_first_ino) 98#endif 99#define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof(__u32)) 100 101/* 102 * Macro-instructions used to manage allocation clusters 103 */ 104#define EXT2_MIN_CLUSTER_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE 105#define EXT2_MAX_CLUSTER_LOG_SIZE 29 /* 512MB */ 106#define EXT2_MIN_CLUSTER_SIZE EXT2_MIN_BLOCK_SIZE 107#define EXT2_MAX_CLUSTER_SIZE (1 << EXT2_MAX_CLUSTER_LOG_SIZE) 108#define EXT2_CLUSTER_SIZE(s) (EXT2_MIN_BLOCK_SIZE << \ 109 (s)->s_log_cluster_size) 110#define EXT2_CLUSTER_SIZE_BITS(s) ((s)->s_log_cluster_size + 10) 111 112/* 113 * Macro-instructions used to manage fragments 114 * 115 * Note: for backwards compatibility only, for the dump program. 116 * Ext2/3/4 will never support fragments.... 117 */ 118#define EXT2_MIN_FRAG_SIZE EXT2_MIN_BLOCK_SIZE 119#define EXT2_MAX_FRAG_SIZE EXT2_MAX_BLOCK_SIZE 120#define EXT2_MIN_FRAG_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE 121#define EXT2_FRAG_SIZE(s) EXT2_BLOCK_SIZE(s) 122#define EXT2_FRAGS_PER_BLOCK(s) 1 123 124/* 125 * ACL structures 126 */ 127struct ext2_acl_header /* Header of Access Control Lists */ 128{ 129 __u32 aclh_size; 130 __u32 aclh_file_count; 131 __u32 aclh_acle_count; 132 __u32 aclh_first_acle; 133}; 134 135struct ext2_acl_entry /* Access Control List Entry */ 136{ 137 __u32 acle_size; 138 __u16 acle_perms; /* Access permissions */ 139 __u16 acle_type; /* Type of entry */ 140 __u16 acle_tag; /* User or group identity */ 141 __u16 acle_pad1; 142 __u32 acle_next; /* Pointer on next entry for the */ 143 /* same inode or on next free entry */ 144}; 145 146/* 147 * Structure of a blocks group descriptor 148 */ 149struct ext2_group_desc 150{ 151 __u32 bg_block_bitmap; /* Blocks bitmap block */ 152 __u32 bg_inode_bitmap; /* Inodes bitmap block */ 153 __u32 bg_inode_table; /* Inodes table block */ 154 __u16 bg_free_blocks_count; /* Free blocks count */ 155 __u16 bg_free_inodes_count; /* Free inodes count */ 156 __u16 bg_used_dirs_count; /* Directories count */ 157 __u16 bg_flags; 158 __u32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 159 __u16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */ 160 __u16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */ 161 __u16 bg_itable_unused; /* Unused inodes count */ 162 __u16 bg_checksum; /* crc16(s_uuid+group_num+group_desc)*/ 163}; 164 165/* 166 * Structure of a blocks group descriptor 167 */ 168struct ext4_group_desc 169{ 170 __u32 bg_block_bitmap; /* Blocks bitmap block */ 171 __u32 bg_inode_bitmap; /* Inodes bitmap block */ 172 __u32 bg_inode_table; /* Inodes table block */ 173 __u16 bg_free_blocks_count; /* Free blocks count */ 174 __u16 bg_free_inodes_count; /* Free inodes count */ 175 __u16 bg_used_dirs_count; /* Directories count */ 176 __u16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 177 __u32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 178 __u16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */ 179 __u16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */ 180 __u16 bg_itable_unused; /* Unused inodes count */ 181 __u16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 182 __u32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 183 __u32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 184 __u32 bg_inode_table_hi; /* Inodes table block MSB */ 185 __u16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 186 __u16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 187 __u16 bg_used_dirs_count_hi; /* Directories count MSB */ 188 __u16 bg_itable_unused_hi; /* Unused inodes count MSB */ 189 __u32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 190 __u16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bitmap) MSB */ 191 __u16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bitmap) MSB */ 192 __u32 bg_reserved; 193}; 194 195#define EXT2_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not initialized */ 196#define EXT2_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not initialized */ 197#define EXT2_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 198 199/* 200 * Data structures used by the directory indexing feature 201 * 202 * Note: all of the multibyte integer fields are little endian. 203 */ 204 205/* 206 * Note: dx_root_info is laid out so that if it should somehow get 207 * overlaid by a dirent the two low bits of the hash version will be 208 * zero. Therefore, the hash version mod 4 should never be 0. 209 * Sincerely, the paranoia department. 210 */ 211struct ext2_dx_root_info { 212 __u32 reserved_zero; 213 __u8 hash_version; /* 0 now, 1 at release */ 214 __u8 info_length; /* 8 */ 215 __u8 indirect_levels; 216 __u8 unused_flags; 217}; 218 219#define EXT2_HASH_LEGACY 0 220#define EXT2_HASH_HALF_MD4 1 221#define EXT2_HASH_TEA 2 222#define EXT2_HASH_LEGACY_UNSIGNED 3 /* reserved for userspace lib */ 223#define EXT2_HASH_HALF_MD4_UNSIGNED 4 /* reserved for userspace lib */ 224#define EXT2_HASH_TEA_UNSIGNED 5 /* reserved for userspace lib */ 225 226#define EXT2_HASH_FLAG_INCOMPAT 0x1 227 228struct ext2_dx_entry { 229 __u32 hash; 230 __u32 block; 231}; 232 233struct ext2_dx_countlimit { 234 __u16 limit; 235 __u16 count; 236}; 237 238 239/* 240 * Macro-instructions used to manage group descriptors 241 */ 242#define EXT2_MIN_DESC_SIZE 32 243#define EXT2_MIN_DESC_SIZE_64BIT 64 244#define EXT2_MAX_DESC_SIZE EXT2_MIN_BLOCK_SIZE 245#define EXT2_DESC_SIZE(s) \ 246 ((EXT2_SB(s)->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) ? \ 247 (s)->s_desc_size : EXT2_MIN_DESC_SIZE) 248 249#define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 250#define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 251#define EXT2_CLUSTERS_PER_GROUP(s) (EXT2_SB(s)->s_clusters_per_group) 252#define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s)) 253/* limits imposed by 16-bit value gd_free_{blocks,inode}_count */ 254#define EXT2_MAX_BLOCKS_PER_GROUP(s) ((((unsigned) 1 << 16) - 8) * \ 255 (EXT2_CLUSTER_SIZE(s) / \ 256 EXT2_BLOCK_SIZE(s))) 257#define EXT2_MAX_CLUSTERS_PER_GROUP(s) (((unsigned) 1 << 16) - 8) 258#define EXT2_MAX_INODES_PER_GROUP(s) (((unsigned) 1 << 16) - \ 259 EXT2_INODES_PER_BLOCK(s)) 260#ifdef __KERNEL__ 261#define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) 262#define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 263#else 264#define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_DESC_SIZE(s)) 265#endif 266 267/* 268 * Constants relative to the data blocks 269 */ 270#define EXT2_NDIR_BLOCKS 12 271#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 272#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 273#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 274#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 275 276/* 277 * Inode flags 278 */ 279#define EXT2_SECRM_FL 0x00000001 /* Secure deletion */ 280#define EXT2_UNRM_FL 0x00000002 /* Undelete */ 281#define EXT2_COMPR_FL 0x00000004 /* Compress file */ 282#define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */ 283#define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */ 284#define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */ 285#define EXT2_NODUMP_FL 0x00000040 /* do not dump file */ 286#define EXT2_NOATIME_FL 0x00000080 /* do not update atime */ 287/* Reserved for compression usage... */ 288#define EXT2_DIRTY_FL 0x00000100 289#define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 290#define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */ 291#define EXT2_ECOMPR_FL 0x00000800 /* Compression error */ 292/* End compression flags --- maybe not all used */ 293#define EXT2_BTREE_FL 0x00001000 /* btree format dir */ 294#define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */ 295#define EXT2_IMAGIC_FL 0x00002000 296#define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 297#define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 298#define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */ 299#define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 300#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 301#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 302#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 303/* EXT4_EOFBLOCKS_FL 0x00400000 was here */ 304#define FS_NOCOW_FL 0x00800000 /* Do not cow file */ 305#define EXT4_SNAPFILE_FL 0x01000000 /* Inode is a snapshot */ 306#define EXT4_SNAPFILE_DELETED_FL 0x04000000 /* Snapshot is being deleted */ 307#define EXT4_SNAPFILE_SHRUNK_FL 0x08000000 /* Snapshot shrink has completed */ 308#define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 309 310#define EXT2_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 311#define EXT2_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ 312 313/* 314 * ioctl commands 315 */ 316 317/* Used for online resize */ 318struct ext2_new_group_input { 319 __u32 group; /* Group number for this data */ 320 __u32 block_bitmap; /* Absolute block number of block bitmap */ 321 __u32 inode_bitmap; /* Absolute block number of inode bitmap */ 322 __u32 inode_table; /* Absolute block number of inode table start */ 323 __u32 blocks_count; /* Total number of blocks in this group */ 324 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 325 __u16 unused; /* Number of reserved GDT blocks in group */ 326}; 327 328struct ext4_new_group_input { 329 __u32 group; /* Group number for this data */ 330 __u64 block_bitmap; /* Absolute block number of block bitmap */ 331 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 332 __u64 inode_table; /* Absolute block number of inode table start */ 333 __u32 blocks_count; /* Total number of blocks in this group */ 334 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 335 __u16 unused; 336}; 337 338#ifdef __GNU__ /* Needed for the Hurd */ 339#define _IOT_ext2_new_group_input _IOT (_IOTS(__u32), 5, _IOTS(__u16), 2, 0, 0) 340#endif 341 342#define EXT2_IOC_GETFLAGS _IOR('f', 1, long) 343#define EXT2_IOC_SETFLAGS _IOW('f', 2, long) 344#define EXT2_IOC_GETVERSION _IOR('v', 1, long) 345#define EXT2_IOC_SETVERSION _IOW('v', 2, long) 346#define EXT2_IOC_GETVERSION_NEW _IOR('f', 3, long) 347#define EXT2_IOC_SETVERSION_NEW _IOW('f', 4, long) 348#define EXT2_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 349#define EXT2_IOC_GROUP_ADD _IOW('f', 8,struct ext2_new_group_input) 350#define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input) 351#define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 352 353/* 354 * Structure of an inode on the disk 355 */ 356struct ext2_inode { 357 __u16 i_mode; /* File mode */ 358 __u16 i_uid; /* Low 16 bits of Owner Uid */ 359 __u32 i_size; /* Size in bytes */ 360 __u32 i_atime; /* Access time */ 361 __u32 i_ctime; /* Inode change time */ 362 __u32 i_mtime; /* Modification time */ 363 __u32 i_dtime; /* Deletion Time */ 364 __u16 i_gid; /* Low 16 bits of Group Id */ 365 __u16 i_links_count; /* Links count */ 366 __u32 i_blocks; /* Blocks count */ 367 __u32 i_flags; /* File flags */ 368 union { 369 struct { 370 __u32 l_i_version; /* was l_i_reserved1 */ 371 } linux1; 372 struct { 373 __u32 h_i_translator; 374 } hurd1; 375 } osd1; /* OS dependent 1 */ 376 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 377 __u32 i_generation; /* File version (for NFS) */ 378 __u32 i_file_acl; /* File ACL */ 379 __u32 i_size_high; /* Formerly i_dir_acl, directory ACL */ 380 __u32 i_faddr; /* Fragment address */ 381 union { 382 struct { 383 __u16 l_i_blocks_hi; 384 __u16 l_i_file_acl_high; 385 __u16 l_i_uid_high; /* these 2 fields */ 386 __u16 l_i_gid_high; /* were reserved2[0] */ 387 __u16 l_i_checksum_lo; /* crc32c(uuid+inum+inode) */ 388 __u16 l_i_reserved; 389 } linux2; 390 struct { 391 __u8 h_i_frag; /* Fragment number */ 392 __u8 h_i_fsize; /* Fragment size */ 393 __u16 h_i_mode_high; 394 __u16 h_i_uid_high; 395 __u16 h_i_gid_high; 396 __u32 h_i_author; 397 } hurd2; 398 } osd2; /* OS dependent 2 */ 399}; 400 401/* 402 * Permanent part of an large inode on the disk 403 */ 404struct ext2_inode_large { 405 __u16 i_mode; /* File mode */ 406 __u16 i_uid; /* Low 16 bits of Owner Uid */ 407 __u32 i_size; /* Size in bytes */ 408 __u32 i_atime; /* Access time */ 409 __u32 i_ctime; /* Inode Change time */ 410 __u32 i_mtime; /* Modification time */ 411 __u32 i_dtime; /* Deletion Time */ 412 __u16 i_gid; /* Low 16 bits of Group Id */ 413 __u16 i_links_count; /* Links count */ 414 __u32 i_blocks; /* Blocks count */ 415 __u32 i_flags; /* File flags */ 416 union { 417 struct { 418 __u32 l_i_version; /* was l_i_reserved1 */ 419 } linux1; 420 struct { 421 __u32 h_i_translator; 422 } hurd1; 423 } osd1; /* OS dependent 1 */ 424 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 425 __u32 i_generation; /* File version (for NFS) */ 426 __u32 i_file_acl; /* File ACL */ 427 __u32 i_size_high; /* Formerly i_dir_acl, directory ACL */ 428 __u32 i_faddr; /* Fragment address */ 429 union { 430 struct { 431 __u16 l_i_blocks_hi; 432 __u16 l_i_file_acl_high; 433 __u16 l_i_uid_high; /* these 2 fields */ 434 __u16 l_i_gid_high; /* were reserved2[0] */ 435 __u16 l_i_checksum_lo; /* crc32c(uuid+inum+inode) */ 436 __u16 l_i_reserved; 437 } linux2; 438 struct { 439 __u8 h_i_frag; /* Fragment number */ 440 __u8 h_i_fsize; /* Fragment size */ 441 __u16 h_i_mode_high; 442 __u16 h_i_uid_high; 443 __u16 h_i_gid_high; 444 __u32 h_i_author; 445 } hurd2; 446 } osd2; /* OS dependent 2 */ 447 __u16 i_extra_isize; 448 __u16 i_checksum_hi; /* crc32c(uuid+inum+inode) */ 449 __u32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 450 __u32 i_mtime_extra; /* extra Modification time (nsec << 2 | epoch) */ 451 __u32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 452 __u32 i_crtime; /* File creation time */ 453 __u32 i_crtime_extra; /* extra File creation time (nsec << 2 | epoch)*/ 454 __u32 i_version_hi; /* high 32 bits for 64-bit version */ 455}; 456 457#define i_dir_acl i_size_high 458 459#if defined(__KERNEL__) || defined(__linux__) 460#define i_reserved1 osd1.linux1.l_i_reserved1 461#define i_frag osd2.linux2.l_i_frag 462#define i_fsize osd2.linux2.l_i_fsize 463#define i_uid_low i_uid 464#define i_gid_low i_gid 465#define i_uid_high osd2.linux2.l_i_uid_high 466#define i_gid_high osd2.linux2.l_i_gid_high 467#else 468#if defined(__GNU__) 469 470#define i_translator osd1.hurd1.h_i_translator 471#define i_frag osd2.hurd2.h_i_frag; 472#define i_fsize osd2.hurd2.h_i_fsize; 473#define i_uid_high osd2.hurd2.h_i_uid_high 474#define i_gid_high osd2.hurd2.h_i_gid_high 475#define i_author osd2.hurd2.h_i_author 476 477#endif /* __GNU__ */ 478#endif /* defined(__KERNEL__) || defined(__linux__) */ 479 480#define inode_uid(inode) ((inode).i_uid | (inode).osd2.linux2.l_i_uid_high << 16) 481#define inode_gid(inode) ((inode).i_gid | (inode).osd2.linux2.l_i_gid_high << 16) 482#define ext2fs_set_i_uid_high(inode,x) ((inode).osd2.linux2.l_i_uid_high = (x)) 483#define ext2fs_set_i_gid_high(inode,x) ((inode).osd2.linux2.l_i_gid_high = (x)) 484 485/* 486 * File system states 487 */ 488#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 489#define EXT2_ERROR_FS 0x0002 /* Errors detected */ 490#define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */ 491 492/* 493 * Misc. filesystem flags 494 */ 495#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 496#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 497#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* OK for use on development code */ 498#define EXT2_FLAGS_IS_SNAPSHOT 0x0010 /* This is a snapshot image */ 499#define EXT2_FLAGS_FIX_SNAPSHOT 0x0020 /* Snapshot inodes corrupted */ 500#define EXT2_FLAGS_FIX_EXCLUDE 0x0040 /* Exclude bitmaps corrupted */ 501 502/* 503 * Mount flags 504 */ 505#define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */ 506#define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */ 507#define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */ 508#define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ 509#define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ 510#define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ 511#define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */ 512#define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */ 513 514#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 515#define set_opt(o, opt) o |= EXT2_MOUNT_##opt 516#define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 517 EXT2_MOUNT_##opt) 518/* 519 * Maximal mount counts between two filesystem checks 520 */ 521#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 522#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 523 524/* 525 * Behaviour when detecting errors 526 */ 527#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 528#define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 529#define EXT2_ERRORS_PANIC 3 /* Panic */ 530#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 531 532#if (__GNUC__ >= 4) 533#define ext4_offsetof(TYPE,MEMBER) __builtin_offsetof(TYPE,MEMBER) 534#else 535#define ext4_offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) 536#endif 537 538/* 539 * Structure of the super block 540 */ 541struct ext2_super_block { 542 __u32 s_inodes_count; /* Inodes count */ 543 __u32 s_blocks_count; /* Blocks count */ 544 __u32 s_r_blocks_count; /* Reserved blocks count */ 545 __u32 s_free_blocks_count; /* Free blocks count */ 546 __u32 s_free_inodes_count; /* Free inodes count */ 547 __u32 s_first_data_block; /* First Data Block */ 548 __u32 s_log_block_size; /* Block size */ 549 __u32 s_log_cluster_size; /* Allocation cluster size */ 550 __u32 s_blocks_per_group; /* # Blocks per group */ 551 __u32 s_clusters_per_group; /* # Fragments per group */ 552 __u32 s_inodes_per_group; /* # Inodes per group */ 553 __u32 s_mtime; /* Mount time */ 554 __u32 s_wtime; /* Write time */ 555 __u16 s_mnt_count; /* Mount count */ 556 __s16 s_max_mnt_count; /* Maximal mount count */ 557 __u16 s_magic; /* Magic signature */ 558 __u16 s_state; /* File system state */ 559 __u16 s_errors; /* Behaviour when detecting errors */ 560 __u16 s_minor_rev_level; /* minor revision level */ 561 __u32 s_lastcheck; /* time of last check */ 562 __u32 s_checkinterval; /* max. time between checks */ 563 __u32 s_creator_os; /* OS */ 564 __u32 s_rev_level; /* Revision level */ 565 __u16 s_def_resuid; /* Default uid for reserved blocks */ 566 __u16 s_def_resgid; /* Default gid for reserved blocks */ 567 /* 568 * These fields are for EXT2_DYNAMIC_REV superblocks only. 569 * 570 * Note: the difference between the compatible feature set and 571 * the incompatible feature set is that if there is a bit set 572 * in the incompatible feature set that the kernel doesn't 573 * know about, it should refuse to mount the filesystem. 574 * 575 * e2fsck's requirements are more strict; if it doesn't know 576 * about a feature in either the compatible or incompatible 577 * feature set, it must abort and not try to meddle with 578 * things it doesn't understand... 579 */ 580 __u32 s_first_ino; /* First non-reserved inode */ 581 __u16 s_inode_size; /* size of inode structure */ 582 __u16 s_block_group_nr; /* block group # of this superblock */ 583 __u32 s_feature_compat; /* compatible feature set */ 584 __u32 s_feature_incompat; /* incompatible feature set */ 585 __u32 s_feature_ro_compat; /* readonly-compatible feature set */ 586 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 587 char s_volume_name[16]; /* volume name */ 588 char s_last_mounted[64]; /* directory where last mounted */ 589 __u32 s_algorithm_usage_bitmap; /* For compression */ 590 /* 591 * Performance hints. Directory preallocation should only 592 * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on. 593 */ 594 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 595 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 596 __u16 s_reserved_gdt_blocks; /* Per group table for online growth */ 597 /* 598 * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set. 599 */ 600 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 601 __u32 s_journal_inum; /* inode number of journal file */ 602 __u32 s_journal_dev; /* device number of journal file */ 603 __u32 s_last_orphan; /* start of list of inodes to delete */ 604 __u32 s_hash_seed[4]; /* HTREE hash seed */ 605 __u8 s_def_hash_version; /* Default hash version to use */ 606 __u8 s_jnl_backup_type; /* Default type of journal backup */ 607 __u16 s_desc_size; /* Group desc. size: INCOMPAT_64BIT */ 608 __u32 s_default_mount_opts; 609 __u32 s_first_meta_bg; /* First metablock group */ 610 __u32 s_mkfs_time; /* When the filesystem was created */ 611 __u32 s_jnl_blocks[17]; /* Backup of the journal inode */ 612 __u32 s_blocks_count_hi; /* Blocks count high 32bits */ 613 __u32 s_r_blocks_count_hi; /* Reserved blocks count high 32 bits*/ 614 __u32 s_free_blocks_hi; /* Free blocks count */ 615 __u16 s_min_extra_isize; /* All inodes have at least # bytes */ 616 __u16 s_want_extra_isize; /* New inodes should reserve # bytes */ 617 __u32 s_flags; /* Miscellaneous flags */ 618 __u16 s_raid_stride; /* RAID stride */ 619 __u16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 620 __u64 s_mmp_block; /* Block for multi-mount protection */ 621 __u32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 622 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 623 __u8 s_reserved_char_pad; 624 __u16 s_reserved_pad; /* Padding to next 32bits */ 625 __u64 s_kbytes_written; /* nr of lifetime kilobytes written */ 626 __u32 s_snapshot_inum; /* Inode number of active snapshot */ 627 __u32 s_snapshot_id; /* sequential ID of active snapshot */ 628 __u64 s_snapshot_r_blocks_count; /* reserved blocks for active 629 snapshot's future use */ 630 __u32 s_snapshot_list; /* inode number of the head of the on-disk snapshot list */ 631#define EXT4_S_ERR_START ext4_offsetof(struct ext2_super_block, s_error_count) 632 __u32 s_error_count; /* number of fs errors */ 633 __u32 s_first_error_time; /* first time an error happened */ 634 __u32 s_first_error_ino; /* inode involved in first error */ 635 __u64 s_first_error_block; /* block involved of first error */ 636 __u8 s_first_error_func[32]; /* function where the error happened */ 637 __u32 s_first_error_line; /* line number where error happened */ 638 __u32 s_last_error_time; /* most recent time of an error */ 639 __u32 s_last_error_ino; /* inode involved in last error */ 640 __u32 s_last_error_line; /* line number where error happened */ 641 __u64 s_last_error_block; /* block involved of last error */ 642 __u8 s_last_error_func[32]; /* function where the error happened */ 643#define EXT4_S_ERR_END ext4_offsetof(struct ext2_super_block, s_mount_opts) 644 __u8 s_mount_opts[64]; 645 __u32 s_usr_quota_inum; /* inode number of user quota file */ 646 __u32 s_grp_quota_inum; /* inode number of group quota file */ 647 __u32 s_overhead_blocks; /* overhead blocks/clusters in fs */ 648 __u32 s_reserved[108]; /* Padding to the end of the block */ 649 __u32 s_checksum; /* crc32c(superblock) */ 650}; 651 652#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 653 654/* 655 * Codes for operating systems 656 */ 657#define EXT2_OS_LINUX 0 658#define EXT2_OS_HURD 1 659#define EXT2_OBSO_OS_MASIX 2 660#define EXT2_OS_FREEBSD 3 661#define EXT2_OS_LITES 4 662 663/* 664 * Revision levels 665 */ 666#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 667#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 668 669#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 670#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 671 672#define EXT2_GOOD_OLD_INODE_SIZE 128 673 674/* 675 * Journal inode backup types 676 */ 677#define EXT3_JNL_BACKUP_BLOCKS 1 678 679/* 680 * Feature set definitions 681 */ 682 683#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 684 ( EXT2_SB(sb)->s_feature_compat & (mask) ) 685#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 686 ( EXT2_SB(sb)->s_feature_ro_compat & (mask) ) 687#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 688 ( EXT2_SB(sb)->s_feature_incompat & (mask) ) 689 690#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 691#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 692#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 693#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 694#define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010 695#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 696#define EXT2_FEATURE_COMPAT_LAZY_BG 0x0040 697/* #define EXT2_FEATURE_COMPAT_EXCLUDE_INODE 0x0080 not used, legacy */ 698#define EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP 0x0100 699 700 701#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 702#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 703/* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 not used */ 704#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 705#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 706#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 707#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 708#define EXT4_FEATURE_RO_COMPAT_HAS_SNAPSHOT 0x0080 709#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 710#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 711#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 712#define EXT4_FEATURE_RO_COMPAT_REPLICA 0x0800 713 714#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 715#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 716#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 717#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 718#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 719#define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040 720#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 721#define EXT4_FEATURE_INCOMPAT_MMP 0x0100 722#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 723#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 724#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 725/* 0x2000 was EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM but this was never used */ 726#define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 727#define EXT4_FEATURE_INCOMPAT_INLINEDATA 0x8000 /* data in inode */ 728 729#define EXT2_FEATURE_COMPAT_SUPP 0 730#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ 731 EXT4_FEATURE_INCOMPAT_MMP) 732#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 733 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 734 EXT4_FEATURE_RO_COMPAT_DIR_NLINK| \ 735 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 736 737/* 738 * Default values for user and/or group using reserved blocks 739 */ 740#define EXT2_DEF_RESUID 0 741#define EXT2_DEF_RESGID 0 742 743/* 744 * Default mount options 745 */ 746#define EXT2_DEFM_DEBUG 0x0001 747#define EXT2_DEFM_BSDGROUPS 0x0002 748#define EXT2_DEFM_XATTR_USER 0x0004 749#define EXT2_DEFM_ACL 0x0008 750#define EXT2_DEFM_UID16 0x0010 751#define EXT3_DEFM_JMODE 0x0060 752#define EXT3_DEFM_JMODE_DATA 0x0020 753#define EXT3_DEFM_JMODE_ORDERED 0x0040 754#define EXT3_DEFM_JMODE_WBACK 0x0060 755#define EXT4_DEFM_NOBARRIER 0x0100 756#define EXT4_DEFM_BLOCK_VALIDITY 0x0200 757#define EXT4_DEFM_DISCARD 0x0400 758#define EXT4_DEFM_NODELALLOC 0x0800 759 760/* 761 * Structure of a directory entry 762 */ 763#define EXT2_NAME_LEN 255 764 765struct ext2_dir_entry { 766 __u32 inode; /* Inode number */ 767 __u16 rec_len; /* Directory entry length */ 768 __u16 name_len; /* Name length */ 769 char name[EXT2_NAME_LEN]; /* File name */ 770}; 771 772/* 773 * The new version of the directory entry. Since EXT2 structures are 774 * stored in intel byte order, and the name_len field could never be 775 * bigger than 255 chars, it's safe to reclaim the extra byte for the 776 * file_type field. 777 */ 778struct ext2_dir_entry_2 { 779 __u32 inode; /* Inode number */ 780 __u16 rec_len; /* Directory entry length */ 781 __u8 name_len; /* Name length */ 782 __u8 file_type; 783 char name[EXT2_NAME_LEN]; /* File name */ 784}; 785 786/* 787 * Ext2 directory file types. Only the low 3 bits are used. The 788 * other bits are reserved for now. 789 */ 790#define EXT2_FT_UNKNOWN 0 791#define EXT2_FT_REG_FILE 1 792#define EXT2_FT_DIR 2 793#define EXT2_FT_CHRDEV 3 794#define EXT2_FT_BLKDEV 4 795#define EXT2_FT_FIFO 5 796#define EXT2_FT_SOCK 6 797#define EXT2_FT_SYMLINK 7 798 799#define EXT2_FT_MAX 8 800 801/* 802 * EXT2_DIR_PAD defines the directory entries boundaries 803 * 804 * NOTE: It must be a multiple of 4 805 */ 806#define EXT2_DIR_PAD 4 807#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 808#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 809 ~EXT2_DIR_ROUND) 810 811/* 812 * This structure is used for multiple mount protection. It is written 813 * into the block number saved in the s_mmp_block field in the superblock. 814 * Programs that check MMP should assume that if SEQ_FSCK (or any unknown 815 * code above SEQ_MAX) is present then it is NOT safe to use the filesystem, 816 * regardless of how old the timestamp is. 817 * 818 * The timestamp in the MMP structure will be updated by e2fsck at some 819 * arbitary intervals (start of passes, after every few groups of inodes 820 * in pass1 and pass1b). There is no guarantee that e2fsck is updating 821 * the MMP block in a timely manner, and the updates it does are purely 822 * for the convenience of the sysadmin and not for automatic validation. 823 * 824 * Note: Only the mmp_seq value is used to determine whether the MMP block 825 * is being updated. The mmp_time, mmp_nodename, and mmp_bdevname 826 * fields are only for informational purposes for the administrator, 827 * due to clock skew between nodes and hostname HA service takeover. 828 */ 829#define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 830#define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 831#define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 832#define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 833 834struct mmp_struct { 835 __u32 mmp_magic; /* Magic number for MMP */ 836 __u32 mmp_seq; /* Sequence no. updated periodically */ 837 __u64 mmp_time; /* Time last updated */ 838 char mmp_nodename[64]; /* Node which last updated MMP block */ 839 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 840 __u16 mmp_check_interval; /* Changed mmp_check_interval */ 841 __u16 mmp_pad1; 842 __u32 mmp_pad2[227]; 843}; 844 845/* 846 * Default interval for MMP update in seconds. 847 */ 848#define EXT4_MMP_UPDATE_INTERVAL 5 849 850/* 851 * Maximum interval for MMP update in seconds. 852 */ 853#define EXT4_MMP_MAX_UPDATE_INTERVAL 300 854 855/* 856 * Minimum interval for MMP checking in seconds. 857 */ 858#define EXT4_MMP_MIN_CHECK_INTERVAL 5 859 860#endif /* _LINUX_EXT2_FS_H */ 861