ext2_fs.h revision 3fbfad558e01ffbacc14e5a536c4dfec0a0af4f5
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 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 allocation clusters 102 */ 103#define EXT2_MIN_CLUSTER_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE 104#define EXT2_MAX_CLUSTER_LOG_SIZE 29 /* 512MB */ 105#define EXT2_MIN_CLUSTER_SIZE EXT2_MIN_BLOCK_SIZE 106#define EXT2_MAX_CLUSTER_SIZE (1 << EXT2_MAX_CLUSTER_LOG_SIZE) 107#define EXT2_CLUSTER_SIZE(s) (EXT2_MIN_BLOCK_SIZE << \ 108 (s)->s_log_cluster_size) 109#define EXT2_CLUSTER_SIZE_BITS(s) ((s)->s_log_cluster_size + 10) 110 111/* 112 * Macro-instructions used to manage fragments 113 * 114 * Note: for backwards compatibility only, for the dump program. 115 * Ext2/3/4 will never support fragments.... 116 */ 117#define EXT2_MIN_FRAG_SIZE EXT2_MIN_BLOCK_SIZE 118#define EXT2_MAX_FRAG_SIZE EXT2_MAX_BLOCK_SIZE 119#define EXT2_MIN_FRAG_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE 120#define EXT2_FRAG_SIZE(s) EXT2_BLOCK_SIZE(s) 121#define EXT2_FRAGS_PER_BLOCK(s) 1 122 123/* 124 * ACL structures 125 */ 126struct ext2_acl_header /* Header of Access Control Lists */ 127{ 128 __u32 aclh_size; 129 __u32 aclh_file_count; 130 __u32 aclh_acle_count; 131 __u32 aclh_first_acle; 132}; 133 134struct ext2_acl_entry /* Access Control List Entry */ 135{ 136 __u32 acle_size; 137 __u16 acle_perms; /* Access permissions */ 138 __u16 acle_type; /* Type of entry */ 139 __u16 acle_tag; /* User or group identity */ 140 __u16 acle_pad1; 141 __u32 acle_next; /* Pointer on next entry for the */ 142 /* same inode or on next free entry */ 143}; 144 145/* 146 * Structure of a blocks group descriptor 147 */ 148struct ext2_group_desc 149{ 150 __u32 bg_block_bitmap; /* Blocks bitmap block */ 151 __u32 bg_inode_bitmap; /* Inodes bitmap block */ 152 __u32 bg_inode_table; /* Inodes table block */ 153 __u16 bg_free_blocks_count; /* Free blocks count */ 154 __u16 bg_free_inodes_count; /* Free inodes count */ 155 __u16 bg_used_dirs_count; /* Directories count */ 156 __u16 bg_flags; 157 __u32 bg_reserved[2]; 158 __u16 bg_itable_unused; /* Unused inodes count */ 159 __u16 bg_checksum; /* crc16(s_uuid+grouo_num+group_desc)*/ 160}; 161 162struct ext4_group_desc 163{ 164 __u32 bg_block_bitmap; /* Blocks bitmap block */ 165 __u32 bg_inode_bitmap; /* Inodes bitmap block */ 166 __u32 bg_inode_table; /* Inodes table block */ 167 __u16 bg_free_blocks_count; /* Free blocks count */ 168 __u16 bg_free_inodes_count; /* Free inodes count */ 169 __u16 bg_used_dirs_count; /* Directories count */ 170 __u16 bg_flags; 171 __u32 bg_reserved[2]; 172 __u16 bg_itable_unused; /* Unused inodes count */ 173 __u16 bg_checksum; /* crc16(s_uuid+grouo_num+group_desc)*/ 174 __u32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 175 __u32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 176 __u32 bg_inode_table_hi; /* Inodes table block MSB */ 177 __u16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 178 __u16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 179 __u16 bg_used_dirs_count_hi; /* Directories count MSB */ 180 __u16 bg_pad; 181 __u32 bg_reserved2[3]; 182}; 183 184#define EXT2_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not initialized */ 185#define EXT2_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not initialized */ 186#define EXT2_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 187 188/* 189 * Data structures used by the directory indexing feature 190 * 191 * Note: all of the multibyte integer fields are little endian. 192 */ 193 194/* 195 * Note: dx_root_info is laid out so that if it should somehow get 196 * overlaid by a dirent the two low bits of the hash version will be 197 * zero. Therefore, the hash version mod 4 should never be 0. 198 * Sincerely, the paranoia department. 199 */ 200struct ext2_dx_root_info { 201 __u32 reserved_zero; 202 __u8 hash_version; /* 0 now, 1 at release */ 203 __u8 info_length; /* 8 */ 204 __u8 indirect_levels; 205 __u8 unused_flags; 206}; 207 208#define EXT2_HASH_LEGACY 0 209#define EXT2_HASH_HALF_MD4 1 210#define EXT2_HASH_TEA 2 211#define EXT2_HASH_LEGACY_UNSIGNED 3 /* reserved for userspace lib */ 212#define EXT2_HASH_HALF_MD4_UNSIGNED 4 /* reserved for userspace lib */ 213#define EXT2_HASH_TEA_UNSIGNED 5 /* reserved for userspace lib */ 214 215#define EXT2_HASH_FLAG_INCOMPAT 0x1 216 217struct ext2_dx_entry { 218 __u32 hash; 219 __u32 block; 220}; 221 222struct ext2_dx_countlimit { 223 __u16 limit; 224 __u16 count; 225}; 226 227 228/* 229 * Macro-instructions used to manage group descriptors 230 */ 231#define EXT2_MIN_DESC_SIZE 32 232#define EXT2_MIN_DESC_SIZE_64BIT 64 233#define EXT2_MAX_DESC_SIZE EXT2_MIN_BLOCK_SIZE 234#define EXT2_DESC_SIZE(s) \ 235 ((EXT2_SB(s)->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) ? \ 236 (s)->s_desc_size : EXT2_MIN_DESC_SIZE) 237 238#define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 239#define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 240#define EXT2_CLUSTERS_PER_GROUP(s) (EXT2_SB(s)->s_clusters_per_group) 241#define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s)) 242/* limits imposed by 16-bit value gd_free_{blocks,inode}_count */ 243#define EXT2_MAX_BLOCKS_PER_GROUP(s) (((1 << 16) - 8) * \ 244 (EXT2_CLUSTER_SIZE(s) / \ 245 EXT2_BLOCK_SIZE(s))) 246#define EXT2_MAX_CLUSTERS_PER_GROUP(s) ((1 << 16) - 8) 247#define EXT2_MAX_INODES_PER_GROUP(s) ((1 << 16) - EXT2_INODES_PER_BLOCK(s)) 248#ifdef __KERNEL__ 249#define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) 250#define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 251#else 252#define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_DESC_SIZE(s)) 253#endif 254 255/* 256 * Constants relative to the data blocks 257 */ 258#define EXT2_NDIR_BLOCKS 12 259#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 260#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 261#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 262#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 263 264/* 265 * Inode flags 266 */ 267#define EXT2_SECRM_FL 0x00000001 /* Secure deletion */ 268#define EXT2_UNRM_FL 0x00000002 /* Undelete */ 269#define EXT2_COMPR_FL 0x00000004 /* Compress file */ 270#define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */ 271#define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */ 272#define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */ 273#define EXT2_NODUMP_FL 0x00000040 /* do not dump file */ 274#define EXT2_NOATIME_FL 0x00000080 /* do not update atime */ 275/* Reserved for compression usage... */ 276#define EXT2_DIRTY_FL 0x00000100 277#define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 278#define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */ 279#define EXT2_ECOMPR_FL 0x00000800 /* Compression error */ 280/* End compression flags --- maybe not all used */ 281#define EXT2_BTREE_FL 0x00001000 /* btree format dir */ 282#define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */ 283#define EXT2_IMAGIC_FL 0x00002000 284#define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 285#define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 286#define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */ 287#define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 288#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 289#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 290#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 291#define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 292#define EXT4_SNAPFILE_FL 0x01000000 /* Inode is a snapshot */ 293#define EXT4_SNAPFILE_DELETED_FL 0x04000000 /* Snapshot is being deleted */ 294#define EXT4_SNAPFILE_SHRUNK_FL 0x08000000 /* Snapshot shrink has completed */ 295#define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 296 297#define EXT2_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 298#define EXT2_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ 299 300/* 301 * ioctl commands 302 */ 303 304/* Used for online resize */ 305struct ext2_new_group_input { 306 __u32 group; /* Group number for this data */ 307 __u32 block_bitmap; /* Absolute block number of block bitmap */ 308 __u32 inode_bitmap; /* Absolute block number of inode bitmap */ 309 __u32 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; /* Number of reserved GDT blocks in group */ 313}; 314 315struct ext4_new_group_input { 316 __u32 group; /* Group number for this data */ 317 __u64 block_bitmap; /* Absolute block number of block bitmap */ 318 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 319 __u64 inode_table; /* Absolute block number of inode table start */ 320 __u32 blocks_count; /* Total number of blocks in this group */ 321 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 322 __u16 unused; 323}; 324 325#ifdef __GNU__ /* Needed for the Hurd */ 326#define _IOT_ext2_new_group_input _IOT (_IOTS(__u32), 5, _IOTS(__u16), 2, 0, 0) 327#endif 328 329#define EXT2_IOC_GETFLAGS _IOR('f', 1, long) 330#define EXT2_IOC_SETFLAGS _IOW('f', 2, long) 331#define EXT2_IOC_GETVERSION _IOR('v', 1, long) 332#define EXT2_IOC_SETVERSION _IOW('v', 2, long) 333#define EXT2_IOC_GETVERSION_NEW _IOR('f', 3, long) 334#define EXT2_IOC_SETVERSION_NEW _IOW('f', 4, long) 335#define EXT2_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 336#define EXT2_IOC_GROUP_ADD _IOW('f', 8,struct ext2_new_group_input) 337#define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input) 338 339/* 340 * Structure of an inode on the disk 341 */ 342struct ext2_inode { 343 __u16 i_mode; /* File mode */ 344 __u16 i_uid; /* Low 16 bits of Owner Uid */ 345 __u32 i_size; /* Size in bytes */ 346 __u32 i_atime; /* Access time */ 347 __u32 i_ctime; /* Inode change time */ 348 __u32 i_mtime; /* Modification time */ 349 __u32 i_dtime; /* Deletion Time */ 350 __u16 i_gid; /* Low 16 bits of Group Id */ 351 __u16 i_links_count; /* Links count */ 352 __u32 i_blocks; /* Blocks count */ 353 __u32 i_flags; /* File flags */ 354 union { 355 struct { 356 __u32 l_i_version; /* was l_i_reserved1 */ 357 } linux1; 358 struct { 359 __u32 h_i_translator; 360 } hurd1; 361 } osd1; /* OS dependent 1 */ 362 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 363 __u32 i_generation; /* File version (for NFS) */ 364 __u32 i_file_acl; /* File ACL */ 365 __u32 i_dir_acl; /* Directory ACL */ 366 __u32 i_faddr; /* Fragment address */ 367 union { 368 struct { 369 __u16 l_i_blocks_hi; 370 __u16 l_i_file_acl_high; 371 __u16 l_i_uid_high; /* these 2 fields */ 372 __u16 l_i_gid_high; /* were reserved2[0] */ 373 __u32 l_i_reserved2; 374 } linux2; 375 struct { 376 __u8 h_i_frag; /* Fragment number */ 377 __u8 h_i_fsize; /* Fragment size */ 378 __u16 h_i_mode_high; 379 __u16 h_i_uid_high; 380 __u16 h_i_gid_high; 381 __u32 h_i_author; 382 } hurd2; 383 } osd2; /* OS dependent 2 */ 384}; 385 386/* 387 * Permanent part of an large inode on the disk 388 */ 389struct ext2_inode_large { 390 __u16 i_mode; /* File mode */ 391 __u16 i_uid; /* Low 16 bits of Owner Uid */ 392 __u32 i_size; /* Size in bytes */ 393 __u32 i_atime; /* Access time */ 394 __u32 i_ctime; /* Inode Change time */ 395 __u32 i_mtime; /* Modification time */ 396 __u32 i_dtime; /* Deletion Time */ 397 __u16 i_gid; /* Low 16 bits of Group Id */ 398 __u16 i_links_count; /* Links count */ 399 __u32 i_blocks; /* Blocks count */ 400 __u32 i_flags; /* File flags */ 401 union { 402 struct { 403 __u32 l_i_version; /* was l_i_reserved1 */ 404 } linux1; 405 struct { 406 __u32 h_i_translator; 407 } hurd1; 408 } osd1; /* OS dependent 1 */ 409 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 410 __u32 i_generation; /* File version (for NFS) */ 411 __u32 i_file_acl; /* File ACL */ 412 __u32 i_dir_acl; /* Directory ACL */ 413 __u32 i_faddr; /* Fragment address */ 414 union { 415 struct { 416 __u16 l_i_blocks_hi; 417 __u16 l_i_file_acl_high; 418 __u16 l_i_uid_high; /* these 2 fields */ 419 __u16 l_i_gid_high; /* were reserved2[0] */ 420 __u32 l_i_reserved2; 421 } linux2; 422 struct { 423 __u8 h_i_frag; /* Fragment number */ 424 __u8 h_i_fsize; /* Fragment size */ 425 __u16 h_i_mode_high; 426 __u16 h_i_uid_high; 427 __u16 h_i_gid_high; 428 __u32 h_i_author; 429 } hurd2; 430 } osd2; /* OS dependent 2 */ 431 __u16 i_extra_isize; 432 __u16 i_pad1; 433 __u32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 434 __u32 i_mtime_extra; /* extra Modification time (nsec << 2 | epoch) */ 435 __u32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 436 __u32 i_crtime; /* File creation time */ 437 __u32 i_crtime_extra; /* extra File creation time (nsec << 2 | epoch)*/ 438 __u32 i_version_hi; /* high 32 bits for 64-bit version */ 439}; 440 441#define i_size_high i_dir_acl 442 443#if defined(__KERNEL__) || defined(__linux__) 444#define i_reserved1 osd1.linux1.l_i_reserved1 445#define i_frag osd2.linux2.l_i_frag 446#define i_fsize osd2.linux2.l_i_fsize 447#define i_uid_low i_uid 448#define i_gid_low i_gid 449#define i_uid_high osd2.linux2.l_i_uid_high 450#define i_gid_high osd2.linux2.l_i_gid_high 451#define i_reserved2 osd2.linux2.l_i_reserved2 452#else 453#if defined(__GNU__) 454 455#define i_translator osd1.hurd1.h_i_translator 456#define i_frag osd2.hurd2.h_i_frag; 457#define i_fsize osd2.hurd2.h_i_fsize; 458#define i_uid_high osd2.hurd2.h_i_uid_high 459#define i_gid_high osd2.hurd2.h_i_gid_high 460#define i_author osd2.hurd2.h_i_author 461 462#endif /* __GNU__ */ 463#endif /* defined(__KERNEL__) || defined(__linux__) */ 464 465#define inode_uid(inode) ((inode).i_uid | (inode).osd2.linux2.l_i_uid_high << 16) 466#define inode_gid(inode) ((inode).i_gid | (inode).osd2.linux2.l_i_gid_high << 16) 467#define ext2fs_set_i_uid_high(inode,x) ((inode).osd2.linux2.l_i_uid_high = (x)) 468#define ext2fs_set_i_gid_high(inode,x) ((inode).osd2.linux2.l_i_gid_high = (x)) 469 470/* 471 * File system states 472 */ 473#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 474#define EXT2_ERROR_FS 0x0002 /* Errors detected */ 475#define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */ 476 477/* 478 * Misc. filesystem flags 479 */ 480#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 481#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 482#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* OK for use on development code */ 483#define EXT2_FLAGS_IS_SNAPSHOT 0x0010 /* This is a snapshot image */ 484#define EXT2_FLAGS_FIX_SNAPSHOT 0x0020 /* Snapshot inodes corrupted */ 485#define EXT2_FLAGS_FIX_EXCLUDE 0x0040 /* Exclude bitmaps corrupted */ 486 487/* 488 * Mount flags 489 */ 490#define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */ 491#define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */ 492#define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */ 493#define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ 494#define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ 495#define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ 496#define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */ 497#define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */ 498 499#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 500#define set_opt(o, opt) o |= EXT2_MOUNT_##opt 501#define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 502 EXT2_MOUNT_##opt) 503/* 504 * Maximal mount counts between two filesystem checks 505 */ 506#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 507#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 508 509/* 510 * Behaviour when detecting errors 511 */ 512#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 513#define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 514#define EXT2_ERRORS_PANIC 3 /* Panic */ 515#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 516 517#if (__GNUC__ >= 4) 518#define ext4_offsetof(TYPE,MEMBER) __builtin_offsetof(TYPE,MEMBER) 519#else 520#define ext4_offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) 521#endif 522 523/* 524 * Structure of the super block 525 */ 526struct ext2_super_block { 527 __u32 s_inodes_count; /* Inodes count */ 528 __u32 s_blocks_count; /* Blocks count */ 529 __u32 s_r_blocks_count; /* Reserved blocks count */ 530 __u32 s_free_blocks_count; /* Free blocks count */ 531 __u32 s_free_inodes_count; /* Free inodes count */ 532 __u32 s_first_data_block; /* First Data Block */ 533 __u32 s_log_block_size; /* Block size */ 534 __u32 s_log_cluster_size; /* Allocation cluster size */ 535 __u32 s_blocks_per_group; /* # Blocks per group */ 536 __u32 s_clusters_per_group; /* # Fragments per group */ 537 __u32 s_inodes_per_group; /* # Inodes per group */ 538 __u32 s_mtime; /* Mount time */ 539 __u32 s_wtime; /* Write time */ 540 __u16 s_mnt_count; /* Mount count */ 541 __s16 s_max_mnt_count; /* Maximal mount count */ 542 __u16 s_magic; /* Magic signature */ 543 __u16 s_state; /* File system state */ 544 __u16 s_errors; /* Behaviour when detecting errors */ 545 __u16 s_minor_rev_level; /* minor revision level */ 546 __u32 s_lastcheck; /* time of last check */ 547 __u32 s_checkinterval; /* max. time between checks */ 548 __u32 s_creator_os; /* OS */ 549 __u32 s_rev_level; /* Revision level */ 550 __u16 s_def_resuid; /* Default uid for reserved blocks */ 551 __u16 s_def_resgid; /* Default gid for reserved blocks */ 552 /* 553 * These fields are for EXT2_DYNAMIC_REV superblocks only. 554 * 555 * Note: the difference between the compatible feature set and 556 * the incompatible feature set is that if there is a bit set 557 * in the incompatible feature set that the kernel doesn't 558 * know about, it should refuse to mount the filesystem. 559 * 560 * e2fsck's requirements are more strict; if it doesn't know 561 * about a feature in either the compatible or incompatible 562 * feature set, it must abort and not try to meddle with 563 * things it doesn't understand... 564 */ 565 __u32 s_first_ino; /* First non-reserved inode */ 566 __u16 s_inode_size; /* size of inode structure */ 567 __u16 s_block_group_nr; /* block group # of this superblock */ 568 __u32 s_feature_compat; /* compatible feature set */ 569 __u32 s_feature_incompat; /* incompatible feature set */ 570 __u32 s_feature_ro_compat; /* readonly-compatible feature set */ 571 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 572 char s_volume_name[16]; /* volume name */ 573 char s_last_mounted[64]; /* directory where last mounted */ 574 __u32 s_algorithm_usage_bitmap; /* For compression */ 575 /* 576 * Performance hints. Directory preallocation should only 577 * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on. 578 */ 579 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 580 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 581 __u16 s_reserved_gdt_blocks; /* Per group table for online growth */ 582 /* 583 * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set. 584 */ 585 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 586 __u32 s_journal_inum; /* inode number of journal file */ 587 __u32 s_journal_dev; /* device number of journal file */ 588 __u32 s_last_orphan; /* start of list of inodes to delete */ 589 __u32 s_hash_seed[4]; /* HTREE hash seed */ 590 __u8 s_def_hash_version; /* Default hash version to use */ 591 __u8 s_jnl_backup_type; /* Default type of journal backup */ 592 __u16 s_desc_size; /* Group desc. size: INCOMPAT_64BIT */ 593 __u32 s_default_mount_opts; 594 __u32 s_first_meta_bg; /* First metablock group */ 595 __u32 s_mkfs_time; /* When the filesystem was created */ 596 __u32 s_jnl_blocks[17]; /* Backup of the journal inode */ 597 __u32 s_blocks_count_hi; /* Blocks count high 32bits */ 598 __u32 s_r_blocks_count_hi; /* Reserved blocks count high 32 bits*/ 599 __u32 s_free_blocks_hi; /* Free blocks count */ 600 __u16 s_min_extra_isize; /* All inodes have at least # bytes */ 601 __u16 s_want_extra_isize; /* New inodes should reserve # bytes */ 602 __u32 s_flags; /* Miscellaneous flags */ 603 __u16 s_raid_stride; /* RAID stride */ 604 __u16 s_mmp_interval; /* # seconds to wait in MMP checking */ 605 __u64 s_mmp_block; /* Block for multi-mount protection */ 606 __u32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 607 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 608 __u8 s_reserved_char_pad; 609 __u16 s_reserved_pad; /* Padding to next 32bits */ 610 __u64 s_kbytes_written; /* nr of lifetime kilobytes written */ 611 __u32 s_snapshot_inum; /* Inode number of active snapshot */ 612 __u32 s_snapshot_id; /* sequential ID of active snapshot */ 613 __u64 s_snapshot_r_blocks_count; /* reserved blocks for active 614 snapshot's future use */ 615 __u32 s_snapshot_list; /* inode number of the head of the on-disk snapshot list */ 616#define EXT4_S_ERR_START ext4_offsetof(struct ext2_super_block, s_error_count) 617 __u32 s_error_count; /* number of fs errors */ 618 __u32 s_first_error_time; /* first time an error happened */ 619 __u32 s_first_error_ino; /* inode involved in first error */ 620 __u64 s_first_error_block; /* block involved of first error */ 621 __u8 s_first_error_func[32]; /* function where the error happened */ 622 __u32 s_first_error_line; /* line number where error happened */ 623 __u32 s_last_error_time; /* most recent time of an error */ 624 __u32 s_last_error_ino; /* inode involved in last error */ 625 __u32 s_last_error_line; /* line number where error happened */ 626 __u64 s_last_error_block; /* block involved of last error */ 627 __u8 s_last_error_func[32]; /* function where the error happened */ 628#define EXT4_S_ERR_END ext4_offsetof(struct ext2_super_block, s_mount_opts) 629 __u8 s_mount_opts[64]; 630 __u32 s_usr_quota_inum; /* inode number of user quota file */ 631 __u32 s_grp_quota_inum; /* inode number of group quota file */ 632 __u32 s_overhead_blocks; /* overhead blocks/clusters in fs */ 633 __u32 s_reserved[109]; /* Padding to the end of the block */ 634}; 635 636#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 637 638/* 639 * Codes for operating systems 640 */ 641#define EXT2_OS_LINUX 0 642#define EXT2_OS_HURD 1 643#define EXT2_OBSO_OS_MASIX 2 644#define EXT2_OS_FREEBSD 3 645#define EXT2_OS_LITES 4 646 647/* 648 * Revision levels 649 */ 650#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 651#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 652 653#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 654#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 655 656#define EXT2_GOOD_OLD_INODE_SIZE 128 657 658/* 659 * Journal inode backup types 660 */ 661#define EXT3_JNL_BACKUP_BLOCKS 1 662 663/* 664 * Feature set definitions 665 */ 666 667#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 668 ( EXT2_SB(sb)->s_feature_compat & (mask) ) 669#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 670 ( EXT2_SB(sb)->s_feature_ro_compat & (mask) ) 671#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 672 ( EXT2_SB(sb)->s_feature_incompat & (mask) ) 673 674#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 675#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 676#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 677#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 678#define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010 679#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 680#define EXT2_FEATURE_COMPAT_LAZY_BG 0x0040 681#define EXT2_FEATURE_COMPAT_EXCLUDE_INODE 0x0080 682 683#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 684#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 685/* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 not used */ 686#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 687#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 688#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 689#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 690#define EXT4_FEATURE_RO_COMPAT_HAS_SNAPSHOT 0x0080 691#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 692#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 693 694#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 695#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 696#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 697#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 698#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 699#define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040 700#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 701#define EXT4_FEATURE_INCOMPAT_MMP 0x0100 702#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 703#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 704#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 705 706#define EXT2_FEATURE_COMPAT_SUPP 0 707#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE) 708#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 709 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 710 EXT4_FEATURE_RO_COMPAT_DIR_NLINK| \ 711 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 712 713/* 714 * Default values for user and/or group using reserved blocks 715 */ 716#define EXT2_DEF_RESUID 0 717#define EXT2_DEF_RESGID 0 718 719/* 720 * Default mount options 721 */ 722#define EXT2_DEFM_DEBUG 0x0001 723#define EXT2_DEFM_BSDGROUPS 0x0002 724#define EXT2_DEFM_XATTR_USER 0x0004 725#define EXT2_DEFM_ACL 0x0008 726#define EXT2_DEFM_UID16 0x0010 727#define EXT3_DEFM_JMODE 0x0060 728#define EXT3_DEFM_JMODE_DATA 0x0020 729#define EXT3_DEFM_JMODE_ORDERED 0x0040 730#define EXT3_DEFM_JMODE_WBACK 0x0060 731#define EXT4_DEFM_NOBARRIER 0x0100 732#define EXT4_DEFM_BLOCK_VALIDITY 0x0200 733#define EXT4_DEFM_DISCARD 0x0400 734#define EXT4_DEFM_NODELALLOC 0x0800 735 736/* 737 * Structure of a directory entry 738 */ 739#define EXT2_NAME_LEN 255 740 741struct ext2_dir_entry { 742 __u32 inode; /* Inode number */ 743 __u16 rec_len; /* Directory entry length */ 744 __u16 name_len; /* Name length */ 745 char name[EXT2_NAME_LEN]; /* File name */ 746}; 747 748/* 749 * The new version of the directory entry. Since EXT2 structures are 750 * stored in intel byte order, and the name_len field could never be 751 * bigger than 255 chars, it's safe to reclaim the extra byte for the 752 * file_type field. 753 */ 754struct ext2_dir_entry_2 { 755 __u32 inode; /* Inode number */ 756 __u16 rec_len; /* Directory entry length */ 757 __u8 name_len; /* Name length */ 758 __u8 file_type; 759 char name[EXT2_NAME_LEN]; /* File name */ 760}; 761 762/* 763 * Ext2 directory file types. Only the low 3 bits are used. The 764 * other bits are reserved for now. 765 */ 766#define EXT2_FT_UNKNOWN 0 767#define EXT2_FT_REG_FILE 1 768#define EXT2_FT_DIR 2 769#define EXT2_FT_CHRDEV 3 770#define EXT2_FT_BLKDEV 4 771#define EXT2_FT_FIFO 5 772#define EXT2_FT_SOCK 6 773#define EXT2_FT_SYMLINK 7 774 775#define EXT2_FT_MAX 8 776 777/* 778 * EXT2_DIR_PAD defines the directory entries boundaries 779 * 780 * NOTE: It must be a multiple of 4 781 */ 782#define EXT2_DIR_PAD 4 783#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 784#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 785 ~EXT2_DIR_ROUND) 786 787/* 788 * This structure will be used for multiple mount protection. It will be 789 * written into the block number saved in the s_mmp_block field in the 790 * superblock. 791 */ 792#define EXT2_MMP_MAGIC 0x004D4D50 /* ASCII for MMP */ 793#define EXT2_MMP_CLEAN 0xFF4D4D50 /* Value of mmp_seq for clean unmount */ 794#define EXT2_MMP_FSCK_ON 0xE24D4D50 /* Value of mmp_seq when being fscked */ 795 796struct mmp_struct { 797 __u32 mmp_magic; 798 __u32 mmp_seq; 799 __u64 mmp_time; 800 char mmp_nodename[64]; 801 char mmp_bdevname[32]; 802 __u16 mmp_interval; 803 __u16 mmp_pad1; 804 __u32 mmp_pad2; 805}; 806 807/* 808 * Interval in number of seconds to update the MMP sequence number. 809 */ 810#define EXT2_MMP_DEF_INTERVAL 5 811 812#endif /* _LINUX_EXT2_FS_H */ 813