ext2_fs.h revision 9d92a201deec7bbb1911e6e5ee98abf3c83882d4
1/* 2 * linux/include/linux/ext2_fs.h 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/include/linux/minix_fs.h 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 */ 15 16#ifndef _LINUX_EXT2_FS_H 17#define _LINUX_EXT2_FS_H 18 19#include <ext2fs/ext2_types.h> /* Changed from linux/types.h */ 20 21/* 22 * The second extended filesystem constants/structures 23 */ 24 25/* 26 * Define EXT2FS_DEBUG to produce debug messages 27 */ 28#undef EXT2FS_DEBUG 29 30/* 31 * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files 32 */ 33#define EXT2_PREALLOCATE 34#define EXT2_DEFAULT_PREALLOC_BLOCKS 8 35 36/* 37 * The second extended file system version 38 */ 39#define EXT2FS_DATE "95/08/09" 40#define EXT2FS_VERSION "0.5b" 41 42/* 43 * Special inode numbers 44 */ 45#define EXT2_BAD_INO 1 /* Bad blocks inode */ 46#define EXT2_ROOT_INO 2 /* Root inode */ 47#define EXT2_ACL_IDX_INO 3 /* ACL inode */ 48#define EXT2_ACL_DATA_INO 4 /* ACL inode */ 49#define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ 50#define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ 51#define EXT2_RESIZE_INO 7 /* Reserved group descriptors inode */ 52#define EXT2_JOURNAL_INO 8 /* Journal inode */ 53#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 */ 117struct 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 125struct 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 */ 139struct 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/* 154 * Structure of a blocks group descriptor 155 */ 156struct ext4_group_desc 157{ 158 __u32 bg_block_bitmap; /* Blocks bitmap block */ 159 __u32 bg_inode_bitmap; /* Inodes bitmap block */ 160 __u32 bg_inode_table; /* Inodes table block */ 161 __u16 bg_free_blocks_count; /* Free blocks count */ 162 __u16 bg_free_inodes_count; /* Free inodes count */ 163 __u16 bg_used_dirs_count; /* Directories count */ 164 __u16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 165 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ 166 __u16 bg_itable_unused; /* Unused inodes count */ 167 __u16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 168 __u32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 169 __u32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 170 __u32 bg_inode_table_hi; /* Inodes table block MSB */ 171 __u16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 172 __u16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 173 __u16 bg_used_dirs_count_hi; /* Directories count MSB */ 174 __u16 bg_itable_unused_hi; /* Unused inodes count MSB */ 175 __u32 bg_reserved2[3]; 176}; 177 178#define EXT2_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not initialized */ 179#define EXT2_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not initialized */ 180#define EXT2_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 181 182/* 183 * Data structures used by the directory indexing feature 184 * 185 * Note: all of the multibyte integer fields are little endian. 186 */ 187 188/* 189 * Note: dx_root_info is laid out so that if it should somehow get 190 * overlaid by a dirent the two low bits of the hash version will be 191 * zero. Therefore, the hash version mod 4 should never be 0. 192 * Sincerely, the paranoia department. 193 */ 194struct ext2_dx_root_info { 195 __u32 reserved_zero; 196 __u8 hash_version; /* 0 now, 1 at release */ 197 __u8 info_length; /* 8 */ 198 __u8 indirect_levels; 199 __u8 unused_flags; 200}; 201 202#define EXT2_HASH_LEGACY 0 203#define EXT2_HASH_HALF_MD4 1 204#define EXT2_HASH_TEA 2 205#define EXT2_HASH_LEGACY_UNSIGNED 3 /* reserved for userspace lib */ 206#define EXT2_HASH_HALF_MD4_UNSIGNED 4 /* reserved for userspace lib */ 207#define EXT2_HASH_TEA_UNSIGNED 5 /* reserved for userspace lib */ 208 209#define EXT2_HASH_FLAG_INCOMPAT 0x1 210 211struct ext2_dx_entry { 212 __u32 hash; 213 __u32 block; 214}; 215 216struct ext2_dx_countlimit { 217 __u16 limit; 218 __u16 count; 219}; 220 221 222/* 223 * Macro-instructions used to manage group descriptors 224 */ 225#define EXT2_MIN_DESC_SIZE 32 226#define EXT2_MIN_DESC_SIZE_64BIT 64 227#define EXT2_MAX_DESC_SIZE EXT2_MIN_BLOCK_SIZE 228#define EXT2_DESC_SIZE(s) \ 229 ((EXT2_SB(s)->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) ? \ 230 (s)->s_desc_size : EXT2_MIN_DESC_SIZE) 231 232#define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 233#define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 234#define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s)) 235/* limits imposed by 16-bit value gd_free_{blocks,inode}_count */ 236#define EXT2_MAX_BLOCKS_PER_GROUP(s) ((1 << 16) - 8) 237#define EXT2_MAX_INODES_PER_GROUP(s) ((1 << 16) - EXT2_INODES_PER_BLOCK(s)) 238#ifdef __KERNEL__ 239#define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) 240#define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 241#else 242#define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_DESC_SIZE(s)) 243#endif 244 245/* 246 * Constants relative to the data blocks 247 */ 248#define EXT2_NDIR_BLOCKS 12 249#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 250#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 251#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 252#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 253 254/* 255 * Inode flags 256 */ 257#define EXT2_SECRM_FL 0x00000001 /* Secure deletion */ 258#define EXT2_UNRM_FL 0x00000002 /* Undelete */ 259#define EXT2_COMPR_FL 0x00000004 /* Compress file */ 260#define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */ 261#define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */ 262#define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */ 263#define EXT2_NODUMP_FL 0x00000040 /* do not dump file */ 264#define EXT2_NOATIME_FL 0x00000080 /* do not update atime */ 265/* Reserved for compression usage... */ 266#define EXT2_DIRTY_FL 0x00000100 267#define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 268#define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */ 269#define EXT2_ECOMPR_FL 0x00000800 /* Compression error */ 270/* End compression flags --- maybe not all used */ 271#define EXT2_BTREE_FL 0x00001000 /* btree format dir */ 272#define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */ 273#define EXT2_IMAGIC_FL 0x00002000 274#define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 275#define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 276#define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */ 277#define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 278#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 279#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 280#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 281#define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 282#define EXT4_SNAPFILE_FL 0x01000000 /* Inode is a snapshot */ 283#define EXT4_SNAPFILE_DELETED_FL 0x04000000 /* Snapshot is being deleted */ 284#define EXT4_SNAPFILE_SHRUNK_FL 0x08000000 /* Snapshot shrink has completed */ 285#define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 286 287#define EXT2_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 288#define EXT2_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ 289 290/* 291 * ioctl commands 292 */ 293 294/* Used for online resize */ 295struct ext2_new_group_input { 296 __u32 group; /* Group number for this data */ 297 __u32 block_bitmap; /* Absolute block number of block bitmap */ 298 __u32 inode_bitmap; /* Absolute block number of inode bitmap */ 299 __u32 inode_table; /* Absolute block number of inode table start */ 300 __u32 blocks_count; /* Total number of blocks in this group */ 301 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 302 __u16 unused; /* Number of reserved GDT blocks in group */ 303}; 304 305struct ext4_new_group_input { 306 __u32 group; /* Group number for this data */ 307 __u64 block_bitmap; /* Absolute block number of block bitmap */ 308 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 309 __u64 inode_table; /* Absolute block number of inode table start */ 310 __u32 blocks_count; /* Total number of blocks in this group */ 311 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 312 __u16 unused; 313}; 314 315#ifdef __GNU__ /* Needed for the Hurd */ 316#define _IOT_ext2_new_group_input _IOT (_IOTS(__u32), 5, _IOTS(__u16), 2, 0, 0) 317#endif 318 319#define EXT2_IOC_GETFLAGS _IOR('f', 1, long) 320#define EXT2_IOC_SETFLAGS _IOW('f', 2, long) 321#define EXT2_IOC_GETVERSION _IOR('v', 1, long) 322#define EXT2_IOC_SETVERSION _IOW('v', 2, long) 323#define EXT2_IOC_GETVERSION_NEW _IOR('f', 3, long) 324#define EXT2_IOC_SETVERSION_NEW _IOW('f', 4, long) 325#define EXT2_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 326#define EXT2_IOC_GROUP_ADD _IOW('f', 8,struct ext2_new_group_input) 327#define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input) 328 329/* 330 * Structure of an inode on the disk 331 */ 332struct ext2_inode { 333 __u16 i_mode; /* File mode */ 334 __u16 i_uid; /* Low 16 bits of Owner Uid */ 335 __u32 i_size; /* Size in bytes */ 336 __u32 i_atime; /* Access time */ 337 __u32 i_ctime; /* Inode change time */ 338 __u32 i_mtime; /* Modification time */ 339 __u32 i_dtime; /* Deletion Time */ 340 __u16 i_gid; /* Low 16 bits of Group Id */ 341 __u16 i_links_count; /* Links count */ 342 __u32 i_blocks; /* Blocks count */ 343 __u32 i_flags; /* File flags */ 344 union { 345 struct { 346 __u32 l_i_version; /* was l_i_reserved1 */ 347 } linux1; 348 struct { 349 __u32 h_i_translator; 350 } hurd1; 351 } osd1; /* OS dependent 1 */ 352 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 353 __u32 i_generation; /* File version (for NFS) */ 354 __u32 i_file_acl; /* File ACL */ 355 __u32 i_size_high; /* Formerly i_dir_acl, directory ACL */ 356 __u32 i_faddr; /* Fragment address */ 357 union { 358 struct { 359 __u16 l_i_blocks_hi; 360 __u16 l_i_file_acl_high; 361 __u16 l_i_uid_high; /* these 2 fields */ 362 __u16 l_i_gid_high; /* were reserved2[0] */ 363 __u32 l_i_reserved2; 364 } linux2; 365 struct { 366 __u8 h_i_frag; /* Fragment number */ 367 __u8 h_i_fsize; /* Fragment size */ 368 __u16 h_i_mode_high; 369 __u16 h_i_uid_high; 370 __u16 h_i_gid_high; 371 __u32 h_i_author; 372 } hurd2; 373 } osd2; /* OS dependent 2 */ 374}; 375 376/* 377 * Permanent part of an large inode on the disk 378 */ 379struct ext2_inode_large { 380 __u16 i_mode; /* File mode */ 381 __u16 i_uid; /* Low 16 bits of Owner Uid */ 382 __u32 i_size; /* Size in bytes */ 383 __u32 i_atime; /* Access time */ 384 __u32 i_ctime; /* Inode Change time */ 385 __u32 i_mtime; /* Modification time */ 386 __u32 i_dtime; /* Deletion Time */ 387 __u16 i_gid; /* Low 16 bits of Group Id */ 388 __u16 i_links_count; /* Links count */ 389 __u32 i_blocks; /* Blocks count */ 390 __u32 i_flags; /* File flags */ 391 union { 392 struct { 393 __u32 l_i_version; /* was l_i_reserved1 */ 394 } linux1; 395 struct { 396 __u32 h_i_translator; 397 } hurd1; 398 } osd1; /* OS dependent 1 */ 399 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 400 __u32 i_generation; /* File version (for NFS) */ 401 __u32 i_file_acl; /* File ACL */ 402 __u32 i_size_high; /* Formerly i_dir_acl, directory ACL */ 403 __u32 i_faddr; /* Fragment address */ 404 union { 405 struct { 406 __u16 l_i_blocks_hi; 407 __u16 l_i_file_acl_high; 408 __u16 l_i_uid_high; /* these 2 fields */ 409 __u16 l_i_gid_high; /* were reserved2[0] */ 410 __u32 l_i_reserved2; 411 } linux2; 412 struct { 413 __u8 h_i_frag; /* Fragment number */ 414 __u8 h_i_fsize; /* Fragment size */ 415 __u16 h_i_mode_high; 416 __u16 h_i_uid_high; 417 __u16 h_i_gid_high; 418 __u32 h_i_author; 419 } hurd2; 420 } osd2; /* OS dependent 2 */ 421 __u16 i_extra_isize; 422 __u16 i_pad1; 423 __u32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 424 __u32 i_mtime_extra; /* extra Modification time (nsec << 2 | epoch) */ 425 __u32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 426 __u32 i_crtime; /* File creation time */ 427 __u32 i_crtime_extra; /* extra File creation time (nsec << 2 | epoch)*/ 428 __u32 i_version_hi; /* high 32 bits for 64-bit version */ 429}; 430 431#define i_dir_acl i_size_high 432 433#if defined(__KERNEL__) || defined(__linux__) 434#define i_reserved1 osd1.linux1.l_i_reserved1 435#define i_frag osd2.linux2.l_i_frag 436#define i_fsize osd2.linux2.l_i_fsize 437#define i_uid_low i_uid 438#define i_gid_low i_gid 439#define i_uid_high osd2.linux2.l_i_uid_high 440#define i_gid_high osd2.linux2.l_i_gid_high 441#define i_reserved2 osd2.linux2.l_i_reserved2 442#else 443#if defined(__GNU__) 444 445#define i_translator osd1.hurd1.h_i_translator 446#define i_frag osd2.hurd2.h_i_frag; 447#define i_fsize osd2.hurd2.h_i_fsize; 448#define i_uid_high osd2.hurd2.h_i_uid_high 449#define i_gid_high osd2.hurd2.h_i_gid_high 450#define i_author osd2.hurd2.h_i_author 451 452#endif /* __GNU__ */ 453#endif /* defined(__KERNEL__) || defined(__linux__) */ 454 455#define inode_uid(inode) ((inode).i_uid | (inode).osd2.linux2.l_i_uid_high << 16) 456#define inode_gid(inode) ((inode).i_gid | (inode).osd2.linux2.l_i_gid_high << 16) 457#define ext2fs_set_i_uid_high(inode,x) ((inode).osd2.linux2.l_i_uid_high = (x)) 458#define ext2fs_set_i_gid_high(inode,x) ((inode).osd2.linux2.l_i_gid_high = (x)) 459 460/* 461 * File system states 462 */ 463#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 464#define EXT2_ERROR_FS 0x0002 /* Errors detected */ 465#define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */ 466 467/* 468 * Misc. filesystem flags 469 */ 470#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 471#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 472#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* OK for use on development code */ 473#define EXT2_FLAGS_IS_SNAPSHOT 0x0010 /* This is a snapshot image */ 474#define EXT2_FLAGS_FIX_SNAPSHOT 0x0020 /* Snapshot inodes corrupted */ 475#define EXT2_FLAGS_FIX_EXCLUDE 0x0040 /* Exclude bitmaps corrupted */ 476 477/* 478 * Mount flags 479 */ 480#define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */ 481#define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */ 482#define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */ 483#define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ 484#define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ 485#define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ 486#define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */ 487#define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */ 488 489#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 490#define set_opt(o, opt) o |= EXT2_MOUNT_##opt 491#define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 492 EXT2_MOUNT_##opt) 493/* 494 * Maximal mount counts between two filesystem checks 495 */ 496#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 497#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 498 499/* 500 * Behaviour when detecting errors 501 */ 502#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 503#define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 504#define EXT2_ERRORS_PANIC 3 /* Panic */ 505#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 506 507#if (__GNUC__ >= 4) 508#define ext4_offsetof(TYPE,MEMBER) __builtin_offsetof(TYPE,MEMBER) 509#else 510#define ext4_offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) 511#endif 512 513/* 514 * Structure of the super block 515 */ 516struct ext2_super_block { 517 __u32 s_inodes_count; /* Inodes count */ 518 __u32 s_blocks_count; /* Blocks count */ 519 __u32 s_r_blocks_count; /* Reserved blocks count */ 520 __u32 s_free_blocks_count; /* Free blocks count */ 521 __u32 s_free_inodes_count; /* Free inodes count */ 522 __u32 s_first_data_block; /* First Data Block */ 523 __u32 s_log_block_size; /* Block size */ 524 __s32 s_log_frag_size; /* Fragment size */ 525 __u32 s_blocks_per_group; /* # Blocks per group */ 526 __u32 s_frags_per_group; /* # Fragments per group */ 527 __u32 s_inodes_per_group; /* # Inodes per group */ 528 __u32 s_mtime; /* Mount time */ 529 __u32 s_wtime; /* Write time */ 530 __u16 s_mnt_count; /* Mount count */ 531 __s16 s_max_mnt_count; /* Maximal mount count */ 532 __u16 s_magic; /* Magic signature */ 533 __u16 s_state; /* File system state */ 534 __u16 s_errors; /* Behaviour when detecting errors */ 535 __u16 s_minor_rev_level; /* minor revision level */ 536 __u32 s_lastcheck; /* time of last check */ 537 __u32 s_checkinterval; /* max. time between checks */ 538 __u32 s_creator_os; /* OS */ 539 __u32 s_rev_level; /* Revision level */ 540 __u16 s_def_resuid; /* Default uid for reserved blocks */ 541 __u16 s_def_resgid; /* Default gid for reserved blocks */ 542 /* 543 * These fields are for EXT2_DYNAMIC_REV superblocks only. 544 * 545 * Note: the difference between the compatible feature set and 546 * the incompatible feature set is that if there is a bit set 547 * in the incompatible feature set that the kernel doesn't 548 * know about, it should refuse to mount the filesystem. 549 * 550 * e2fsck's requirements are more strict; if it doesn't know 551 * about a feature in either the compatible or incompatible 552 * feature set, it must abort and not try to meddle with 553 * things it doesn't understand... 554 */ 555 __u32 s_first_ino; /* First non-reserved inode */ 556 __u16 s_inode_size; /* size of inode structure */ 557 __u16 s_block_group_nr; /* block group # of this superblock */ 558 __u32 s_feature_compat; /* compatible feature set */ 559 __u32 s_feature_incompat; /* incompatible feature set */ 560 __u32 s_feature_ro_compat; /* readonly-compatible feature set */ 561 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 562 char s_volume_name[16]; /* volume name */ 563 char s_last_mounted[64]; /* directory where last mounted */ 564 __u32 s_algorithm_usage_bitmap; /* For compression */ 565 /* 566 * Performance hints. Directory preallocation should only 567 * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on. 568 */ 569 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 570 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 571 __u16 s_reserved_gdt_blocks; /* Per group table for online growth */ 572 /* 573 * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set. 574 */ 575 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 576 __u32 s_journal_inum; /* inode number of journal file */ 577 __u32 s_journal_dev; /* device number of journal file */ 578 __u32 s_last_orphan; /* start of list of inodes to delete */ 579 __u32 s_hash_seed[4]; /* HTREE hash seed */ 580 __u8 s_def_hash_version; /* Default hash version to use */ 581 __u8 s_jnl_backup_type; /* Default type of journal backup */ 582 __u16 s_desc_size; /* Group desc. size: INCOMPAT_64BIT */ 583 __u32 s_default_mount_opts; 584 __u32 s_first_meta_bg; /* First metablock group */ 585 __u32 s_mkfs_time; /* When the filesystem was created */ 586 __u32 s_jnl_blocks[17]; /* Backup of the journal inode */ 587 __u32 s_blocks_count_hi; /* Blocks count high 32bits */ 588 __u32 s_r_blocks_count_hi; /* Reserved blocks count high 32 bits*/ 589 __u32 s_free_blocks_hi; /* Free blocks count */ 590 __u16 s_min_extra_isize; /* All inodes have at least # bytes */ 591 __u16 s_want_extra_isize; /* New inodes should reserve # bytes */ 592 __u32 s_flags; /* Miscellaneous flags */ 593 __u16 s_raid_stride; /* RAID stride */ 594 __u16 s_mmp_interval; /* # seconds to wait in MMP checking */ 595 __u64 s_mmp_block; /* Block for multi-mount protection */ 596 __u32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 597 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 598 __u8 s_reserved_char_pad; 599 __u16 s_reserved_pad; /* Padding to next 32bits */ 600 __u64 s_kbytes_written; /* nr of lifetime kilobytes written */ 601 __u32 s_snapshot_inum; /* Inode number of active snapshot */ 602 __u32 s_snapshot_id; /* sequential ID of active snapshot */ 603 __u64 s_snapshot_r_blocks_count; /* reserved blocks for active 604 snapshot's future use */ 605 __u32 s_snapshot_list; /* inode number of the head of the on-disk snapshot list */ 606#define EXT4_S_ERR_START ext4_offsetof(struct ext2_super_block, s_error_count) 607 __u32 s_error_count; /* number of fs errors */ 608 __u32 s_first_error_time; /* first time an error happened */ 609 __u32 s_first_error_ino; /* inode involved in first error */ 610 __u64 s_first_error_block; /* block involved of first error */ 611 __u8 s_first_error_func[32]; /* function where the error happened */ 612 __u32 s_first_error_line; /* line number where error happened */ 613 __u32 s_last_error_time; /* most recent time of an error */ 614 __u32 s_last_error_ino; /* inode involved in last error */ 615 __u32 s_last_error_line; /* line number where error happened */ 616 __u64 s_last_error_block; /* block involved of last error */ 617 __u8 s_last_error_func[32]; /* function where the error happened */ 618#define EXT4_S_ERR_END ext4_offsetof(struct ext2_super_block, s_mount_opts) 619 __u8 s_mount_opts[64]; 620 __u32 s_reserved[112]; /* Padding to the end of the block */ 621}; 622 623#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 624 625/* 626 * Codes for operating systems 627 */ 628#define EXT2_OS_LINUX 0 629#define EXT2_OS_HURD 1 630#define EXT2_OBSO_OS_MASIX 2 631#define EXT2_OS_FREEBSD 3 632#define EXT2_OS_LITES 4 633 634/* 635 * Revision levels 636 */ 637#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 638#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 639 640#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 641#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 642 643#define EXT2_GOOD_OLD_INODE_SIZE 128 644 645/* 646 * Journal inode backup types 647 */ 648#define EXT3_JNL_BACKUP_BLOCKS 1 649 650/* 651 * Feature set definitions 652 */ 653 654#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 655 ( EXT2_SB(sb)->s_feature_compat & (mask) ) 656#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 657 ( EXT2_SB(sb)->s_feature_ro_compat & (mask) ) 658#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 659 ( EXT2_SB(sb)->s_feature_incompat & (mask) ) 660 661#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 662#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 663#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 664#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 665#define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010 666#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 667#define EXT2_FEATURE_COMPAT_LAZY_BG 0x0040 668#define EXT2_FEATURE_COMPAT_EXCLUDE_INODE 0x0080 669 670#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 671#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 672/* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 not used */ 673#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 674#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 675#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 676#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 677#define EXT4_FEATURE_RO_COMPAT_HAS_SNAPSHOT 0x0080 678 679#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 680#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 681#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 682#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 683#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 684#define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040 685#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 686#define EXT4_FEATURE_INCOMPAT_MMP 0x0100 687#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 688#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 689#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 690 691 692#define EXT2_FEATURE_COMPAT_SUPP 0 693#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE) 694#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 695 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 696 EXT4_FEATURE_RO_COMPAT_DIR_NLINK| \ 697 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 698 699/* 700 * Default values for user and/or group using reserved blocks 701 */ 702#define EXT2_DEF_RESUID 0 703#define EXT2_DEF_RESGID 0 704 705/* 706 * Default mount options 707 */ 708#define EXT2_DEFM_DEBUG 0x0001 709#define EXT2_DEFM_BSDGROUPS 0x0002 710#define EXT2_DEFM_XATTR_USER 0x0004 711#define EXT2_DEFM_ACL 0x0008 712#define EXT2_DEFM_UID16 0x0010 713#define EXT3_DEFM_JMODE 0x0060 714#define EXT3_DEFM_JMODE_DATA 0x0020 715#define EXT3_DEFM_JMODE_ORDERED 0x0040 716#define EXT3_DEFM_JMODE_WBACK 0x0060 717#define EXT4_DEFM_NOBARRIER 0x0100 718#define EXT4_DEFM_BLOCK_VALIDITY 0x0200 719#define EXT4_DEFM_DISCARD 0x0400 720#define EXT4_DEFM_NODELALLOC 0x0800 721 722/* 723 * Structure of a directory entry 724 */ 725#define EXT2_NAME_LEN 255 726 727struct ext2_dir_entry { 728 __u32 inode; /* Inode number */ 729 __u16 rec_len; /* Directory entry length */ 730 __u16 name_len; /* Name length */ 731 char name[EXT2_NAME_LEN]; /* File name */ 732}; 733 734/* 735 * The new version of the directory entry. Since EXT2 structures are 736 * stored in intel byte order, and the name_len field could never be 737 * bigger than 255 chars, it's safe to reclaim the extra byte for the 738 * file_type field. 739 */ 740struct ext2_dir_entry_2 { 741 __u32 inode; /* Inode number */ 742 __u16 rec_len; /* Directory entry length */ 743 __u8 name_len; /* Name length */ 744 __u8 file_type; 745 char name[EXT2_NAME_LEN]; /* File name */ 746}; 747 748/* 749 * Ext2 directory file types. Only the low 3 bits are used. The 750 * other bits are reserved for now. 751 */ 752#define EXT2_FT_UNKNOWN 0 753#define EXT2_FT_REG_FILE 1 754#define EXT2_FT_DIR 2 755#define EXT2_FT_CHRDEV 3 756#define EXT2_FT_BLKDEV 4 757#define EXT2_FT_FIFO 5 758#define EXT2_FT_SOCK 6 759#define EXT2_FT_SYMLINK 7 760 761#define EXT2_FT_MAX 8 762 763/* 764 * EXT2_DIR_PAD defines the directory entries boundaries 765 * 766 * NOTE: It must be a multiple of 4 767 */ 768#define EXT2_DIR_PAD 4 769#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 770#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 771 ~EXT2_DIR_ROUND) 772 773/* 774 * This structure will be used for multiple mount protection. It will be 775 * written into the block number saved in the s_mmp_block field in the 776 * superblock. 777 */ 778#define EXT2_MMP_MAGIC 0x004D4D50 /* ASCII for MMP */ 779#define EXT2_MMP_CLEAN 0xFF4D4D50 /* Value of mmp_seq for clean unmount */ 780#define EXT2_MMP_FSCK_ON 0xE24D4D50 /* Value of mmp_seq when being fscked */ 781 782struct mmp_struct { 783 __u32 mmp_magic; 784 __u32 mmp_seq; 785 __u64 mmp_time; 786 char mmp_nodename[64]; 787 char mmp_bdevname[32]; 788 __u16 mmp_interval; 789 __u16 mmp_pad1; 790 __u32 mmp_pad2; 791}; 792 793/* 794 * Interval in number of seconds to update the MMP sequence number. 795 */ 796#define EXT2_MMP_DEF_INTERVAL 5 797 798#endif /* _LINUX_EXT2_FS_H */ 799