ext2_fs.h revision 75405ffde6f87f88c7172bfb431ec085c542ec1a
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}; 161 162/* 163 * Structure of a blocks group descriptor 164 */ 165struct ext4_group_desc 166{ 167 __u32 bg_block_bitmap; /* Blocks bitmap block */ 168 __u32 bg_inode_bitmap; /* Inodes bitmap block */ 169 __u32 bg_inode_table; /* Inodes table block */ 170 __u16 bg_free_blocks_count; /* Free blocks count */ 171 __u16 bg_free_inodes_count; /* Free inodes count */ 172 __u16 bg_used_dirs_count; /* Directories count */ 173 __u16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 174 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ 175 __u16 bg_itable_unused; /* Unused inodes count */ 176 __u16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 177 __u32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 178 __u32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 179 __u32 bg_inode_table_hi; /* Inodes table block MSB */ 180 __u16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 181 __u16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 182 __u16 bg_used_dirs_count_hi; /* Directories count MSB */ 183 __u16 bg_itable_unused_hi; /* Unused inodes count MSB */ 184 __u32 bg_reserved2[3]; 185}; 186 187#define EXT2_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not initialized */ 188#define EXT2_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not initialized */ 189#define EXT2_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 190 191/* 192 * Data structures used by the directory indexing feature 193 * 194 * Note: all of the multibyte integer fields are little endian. 195 */ 196 197/* 198 * Note: dx_root_info is laid out so that if it should somehow get 199 * overlaid by a dirent the two low bits of the hash version will be 200 * zero. Therefore, the hash version mod 4 should never be 0. 201 * Sincerely, the paranoia department. 202 */ 203struct ext2_dx_root_info { 204 __u32 reserved_zero; 205 __u8 hash_version; /* 0 now, 1 at release */ 206 __u8 info_length; /* 8 */ 207 __u8 indirect_levels; 208 __u8 unused_flags; 209}; 210 211#define EXT2_HASH_LEGACY 0 212#define EXT2_HASH_HALF_MD4 1 213#define EXT2_HASH_TEA 2 214#define EXT2_HASH_LEGACY_UNSIGNED 3 /* reserved for userspace lib */ 215#define EXT2_HASH_HALF_MD4_UNSIGNED 4 /* reserved for userspace lib */ 216#define EXT2_HASH_TEA_UNSIGNED 5 /* reserved for userspace lib */ 217 218#define EXT2_HASH_FLAG_INCOMPAT 0x1 219 220struct ext2_dx_entry { 221 __u32 hash; 222 __u32 block; 223}; 224 225struct ext2_dx_countlimit { 226 __u16 limit; 227 __u16 count; 228}; 229 230 231/* 232 * Macro-instructions used to manage group descriptors 233 */ 234#define EXT2_MIN_DESC_SIZE 32 235#define EXT2_MIN_DESC_SIZE_64BIT 64 236#define EXT2_MAX_DESC_SIZE EXT2_MIN_BLOCK_SIZE 237#define EXT2_DESC_SIZE(s) \ 238 ((EXT2_SB(s)->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) ? \ 239 (s)->s_desc_size : EXT2_MIN_DESC_SIZE) 240 241#define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 242#define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 243#define EXT2_CLUSTERS_PER_GROUP(s) (EXT2_SB(s)->s_clusters_per_group) 244#define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s)) 245/* limits imposed by 16-bit value gd_free_{blocks,inode}_count */ 246#define EXT2_MAX_BLOCKS_PER_GROUP(s) ((((unsigned) 1 << 16) - 8) * \ 247 (EXT2_CLUSTER_SIZE(s) / \ 248 EXT2_BLOCK_SIZE(s))) 249#define EXT2_MAX_CLUSTERS_PER_GROUP(s) (((unsigned) 1 << 16) - 8) 250#define EXT2_MAX_INODES_PER_GROUP(s) (((unsigned) 1 << 16) - \ 251 EXT2_INODES_PER_BLOCK(s)) 252#ifdef __KERNEL__ 253#define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) 254#define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 255#else 256#define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_DESC_SIZE(s)) 257#endif 258 259/* 260 * Constants relative to the data blocks 261 */ 262#define EXT2_NDIR_BLOCKS 12 263#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 264#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 265#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 266#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 267 268/* 269 * Inode flags 270 */ 271#define EXT2_SECRM_FL 0x00000001 /* Secure deletion */ 272#define EXT2_UNRM_FL 0x00000002 /* Undelete */ 273#define EXT2_COMPR_FL 0x00000004 /* Compress file */ 274#define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */ 275#define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */ 276#define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */ 277#define EXT2_NODUMP_FL 0x00000040 /* do not dump file */ 278#define EXT2_NOATIME_FL 0x00000080 /* do not update atime */ 279/* Reserved for compression usage... */ 280#define EXT2_DIRTY_FL 0x00000100 281#define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 282#define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */ 283#define EXT2_ECOMPR_FL 0x00000800 /* Compression error */ 284/* End compression flags --- maybe not all used */ 285#define EXT2_BTREE_FL 0x00001000 /* btree format dir */ 286#define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */ 287#define EXT2_IMAGIC_FL 0x00002000 288#define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 289#define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 290#define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */ 291#define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 292#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 293#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 294#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 295#define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 296#define EXT4_SNAPFILE_FL 0x01000000 /* Inode is a snapshot */ 297#define EXT4_SNAPFILE_DELETED_FL 0x04000000 /* Snapshot is being deleted */ 298#define EXT4_SNAPFILE_SHRUNK_FL 0x08000000 /* Snapshot shrink has completed */ 299#define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 300 301#define EXT2_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 302#define EXT2_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ 303 304/* 305 * ioctl commands 306 */ 307 308/* Used for online resize */ 309struct ext2_new_group_input { 310 __u32 group; /* Group number for this data */ 311 __u32 block_bitmap; /* Absolute block number of block bitmap */ 312 __u32 inode_bitmap; /* Absolute block number of inode bitmap */ 313 __u32 inode_table; /* Absolute block number of inode table start */ 314 __u32 blocks_count; /* Total number of blocks in this group */ 315 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 316 __u16 unused; /* Number of reserved GDT blocks in group */ 317}; 318 319struct ext4_new_group_input { 320 __u32 group; /* Group number for this data */ 321 __u64 block_bitmap; /* Absolute block number of block bitmap */ 322 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 323 __u64 inode_table; /* Absolute block number of inode table start */ 324 __u32 blocks_count; /* Total number of blocks in this group */ 325 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 326 __u16 unused; 327}; 328 329#ifdef __GNU__ /* Needed for the Hurd */ 330#define _IOT_ext2_new_group_input _IOT (_IOTS(__u32), 5, _IOTS(__u16), 2, 0, 0) 331#endif 332 333#define EXT2_IOC_GETFLAGS _IOR('f', 1, long) 334#define EXT2_IOC_SETFLAGS _IOW('f', 2, long) 335#define EXT2_IOC_GETVERSION _IOR('v', 1, long) 336#define EXT2_IOC_SETVERSION _IOW('v', 2, long) 337#define EXT2_IOC_GETVERSION_NEW _IOR('f', 3, long) 338#define EXT2_IOC_SETVERSION_NEW _IOW('f', 4, long) 339#define EXT2_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 340#define EXT2_IOC_GROUP_ADD _IOW('f', 8,struct ext2_new_group_input) 341#define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input) 342#define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 343 344/* 345 * Structure of an inode on the disk 346 */ 347struct ext2_inode { 348 __u16 i_mode; /* File mode */ 349 __u16 i_uid; /* Low 16 bits of Owner Uid */ 350 __u32 i_size; /* Size in bytes */ 351 __u32 i_atime; /* Access time */ 352 __u32 i_ctime; /* Inode change time */ 353 __u32 i_mtime; /* Modification time */ 354 __u32 i_dtime; /* Deletion Time */ 355 __u16 i_gid; /* Low 16 bits of Group Id */ 356 __u16 i_links_count; /* Links count */ 357 __u32 i_blocks; /* Blocks count */ 358 __u32 i_flags; /* File flags */ 359 union { 360 struct { 361 __u32 l_i_version; /* was l_i_reserved1 */ 362 } linux1; 363 struct { 364 __u32 h_i_translator; 365 } hurd1; 366 } osd1; /* OS dependent 1 */ 367 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 368 __u32 i_generation; /* File version (for NFS) */ 369 __u32 i_file_acl; /* File ACL */ 370 __u32 i_size_high; /* Formerly i_dir_acl, directory ACL */ 371 __u32 i_faddr; /* Fragment address */ 372 union { 373 struct { 374 __u16 l_i_blocks_hi; 375 __u16 l_i_file_acl_high; 376 __u16 l_i_uid_high; /* these 2 fields */ 377 __u16 l_i_gid_high; /* were reserved2[0] */ 378 __u32 l_i_reserved2; 379 } linux2; 380 struct { 381 __u8 h_i_frag; /* Fragment number */ 382 __u8 h_i_fsize; /* Fragment size */ 383 __u16 h_i_mode_high; 384 __u16 h_i_uid_high; 385 __u16 h_i_gid_high; 386 __u32 h_i_author; 387 } hurd2; 388 } osd2; /* OS dependent 2 */ 389}; 390 391/* 392 * Permanent part of an large inode on the disk 393 */ 394struct ext2_inode_large { 395 __u16 i_mode; /* File mode */ 396 __u16 i_uid; /* Low 16 bits of Owner Uid */ 397 __u32 i_size; /* Size in bytes */ 398 __u32 i_atime; /* Access time */ 399 __u32 i_ctime; /* Inode Change time */ 400 __u32 i_mtime; /* Modification time */ 401 __u32 i_dtime; /* Deletion Time */ 402 __u16 i_gid; /* Low 16 bits of Group Id */ 403 __u16 i_links_count; /* Links count */ 404 __u32 i_blocks; /* Blocks count */ 405 __u32 i_flags; /* File flags */ 406 union { 407 struct { 408 __u32 l_i_version; /* was l_i_reserved1 */ 409 } linux1; 410 struct { 411 __u32 h_i_translator; 412 } hurd1; 413 } osd1; /* OS dependent 1 */ 414 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 415 __u32 i_generation; /* File version (for NFS) */ 416 __u32 i_file_acl; /* File ACL */ 417 __u32 i_size_high; /* Formerly i_dir_acl, directory ACL */ 418 __u32 i_faddr; /* Fragment address */ 419 union { 420 struct { 421 __u16 l_i_blocks_hi; 422 __u16 l_i_file_acl_high; 423 __u16 l_i_uid_high; /* these 2 fields */ 424 __u16 l_i_gid_high; /* were reserved2[0] */ 425 __u32 l_i_reserved2; 426 } linux2; 427 struct { 428 __u8 h_i_frag; /* Fragment number */ 429 __u8 h_i_fsize; /* Fragment size */ 430 __u16 h_i_mode_high; 431 __u16 h_i_uid_high; 432 __u16 h_i_gid_high; 433 __u32 h_i_author; 434 } hurd2; 435 } osd2; /* OS dependent 2 */ 436 __u16 i_extra_isize; 437 __u16 i_pad1; 438 __u32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 439 __u32 i_mtime_extra; /* extra Modification time (nsec << 2 | epoch) */ 440 __u32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 441 __u32 i_crtime; /* File creation time */ 442 __u32 i_crtime_extra; /* extra File creation time (nsec << 2 | epoch)*/ 443 __u32 i_version_hi; /* high 32 bits for 64-bit version */ 444}; 445 446#define i_dir_acl i_size_high 447 448#if defined(__KERNEL__) || defined(__linux__) 449#define i_reserved1 osd1.linux1.l_i_reserved1 450#define i_frag osd2.linux2.l_i_frag 451#define i_fsize osd2.linux2.l_i_fsize 452#define i_uid_low i_uid 453#define i_gid_low i_gid 454#define i_uid_high osd2.linux2.l_i_uid_high 455#define i_gid_high osd2.linux2.l_i_gid_high 456#define i_reserved2 osd2.linux2.l_i_reserved2 457#else 458#if defined(__GNU__) 459 460#define i_translator osd1.hurd1.h_i_translator 461#define i_frag osd2.hurd2.h_i_frag; 462#define i_fsize osd2.hurd2.h_i_fsize; 463#define i_uid_high osd2.hurd2.h_i_uid_high 464#define i_gid_high osd2.hurd2.h_i_gid_high 465#define i_author osd2.hurd2.h_i_author 466 467#endif /* __GNU__ */ 468#endif /* defined(__KERNEL__) || defined(__linux__) */ 469 470#define inode_uid(inode) ((inode).i_uid | (inode).osd2.linux2.l_i_uid_high << 16) 471#define inode_gid(inode) ((inode).i_gid | (inode).osd2.linux2.l_i_gid_high << 16) 472#define ext2fs_set_i_uid_high(inode,x) ((inode).osd2.linux2.l_i_uid_high = (x)) 473#define ext2fs_set_i_gid_high(inode,x) ((inode).osd2.linux2.l_i_gid_high = (x)) 474 475/* 476 * File system states 477 */ 478#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 479#define EXT2_ERROR_FS 0x0002 /* Errors detected */ 480#define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */ 481 482/* 483 * Misc. filesystem flags 484 */ 485#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 486#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 487#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* OK for use on development code */ 488#define EXT2_FLAGS_IS_SNAPSHOT 0x0010 /* This is a snapshot image */ 489#define EXT2_FLAGS_FIX_SNAPSHOT 0x0020 /* Snapshot inodes corrupted */ 490#define EXT2_FLAGS_FIX_EXCLUDE 0x0040 /* Exclude bitmaps corrupted */ 491 492/* 493 * Mount flags 494 */ 495#define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */ 496#define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */ 497#define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */ 498#define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ 499#define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ 500#define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ 501#define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */ 502#define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */ 503 504#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 505#define set_opt(o, opt) o |= EXT2_MOUNT_##opt 506#define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 507 EXT2_MOUNT_##opt) 508/* 509 * Maximal mount counts between two filesystem checks 510 */ 511#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 512#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 513 514/* 515 * Behaviour when detecting errors 516 */ 517#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 518#define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 519#define EXT2_ERRORS_PANIC 3 /* Panic */ 520#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 521 522#if (__GNUC__ >= 4) 523#define ext4_offsetof(TYPE,MEMBER) __builtin_offsetof(TYPE,MEMBER) 524#else 525#define ext4_offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) 526#endif 527 528/* 529 * Structure of the super block 530 */ 531struct ext2_super_block { 532 __u32 s_inodes_count; /* Inodes count */ 533 __u32 s_blocks_count; /* Blocks count */ 534 __u32 s_r_blocks_count; /* Reserved blocks count */ 535 __u32 s_free_blocks_count; /* Free blocks count */ 536 __u32 s_free_inodes_count; /* Free inodes count */ 537 __u32 s_first_data_block; /* First Data Block */ 538 __u32 s_log_block_size; /* Block size */ 539 __u32 s_log_cluster_size; /* Allocation cluster size */ 540 __u32 s_blocks_per_group; /* # Blocks per group */ 541 __u32 s_clusters_per_group; /* # Fragments per group */ 542 __u32 s_inodes_per_group; /* # Inodes per group */ 543 __u32 s_mtime; /* Mount time */ 544 __u32 s_wtime; /* Write time */ 545 __u16 s_mnt_count; /* Mount count */ 546 __s16 s_max_mnt_count; /* Maximal mount count */ 547 __u16 s_magic; /* Magic signature */ 548 __u16 s_state; /* File system state */ 549 __u16 s_errors; /* Behaviour when detecting errors */ 550 __u16 s_minor_rev_level; /* minor revision level */ 551 __u32 s_lastcheck; /* time of last check */ 552 __u32 s_checkinterval; /* max. time between checks */ 553 __u32 s_creator_os; /* OS */ 554 __u32 s_rev_level; /* Revision level */ 555 __u16 s_def_resuid; /* Default uid for reserved blocks */ 556 __u16 s_def_resgid; /* Default gid for reserved blocks */ 557 /* 558 * These fields are for EXT2_DYNAMIC_REV superblocks only. 559 * 560 * Note: the difference between the compatible feature set and 561 * the incompatible feature set is that if there is a bit set 562 * in the incompatible feature set that the kernel doesn't 563 * know about, it should refuse to mount the filesystem. 564 * 565 * e2fsck's requirements are more strict; if it doesn't know 566 * about a feature in either the compatible or incompatible 567 * feature set, it must abort and not try to meddle with 568 * things it doesn't understand... 569 */ 570 __u32 s_first_ino; /* First non-reserved inode */ 571 __u16 s_inode_size; /* size of inode structure */ 572 __u16 s_block_group_nr; /* block group # of this superblock */ 573 __u32 s_feature_compat; /* compatible feature set */ 574 __u32 s_feature_incompat; /* incompatible feature set */ 575 __u32 s_feature_ro_compat; /* readonly-compatible feature set */ 576 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 577 char s_volume_name[16]; /* volume name */ 578 char s_last_mounted[64]; /* directory where last mounted */ 579 __u32 s_algorithm_usage_bitmap; /* For compression */ 580 /* 581 * Performance hints. Directory preallocation should only 582 * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on. 583 */ 584 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 585 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 586 __u16 s_reserved_gdt_blocks; /* Per group table for online growth */ 587 /* 588 * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set. 589 */ 590 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 591 __u32 s_journal_inum; /* inode number of journal file */ 592 __u32 s_journal_dev; /* device number of journal file */ 593 __u32 s_last_orphan; /* start of list of inodes to delete */ 594 __u32 s_hash_seed[4]; /* HTREE hash seed */ 595 __u8 s_def_hash_version; /* Default hash version to use */ 596 __u8 s_jnl_backup_type; /* Default type of journal backup */ 597 __u16 s_desc_size; /* Group desc. size: INCOMPAT_64BIT */ 598 __u32 s_default_mount_opts; 599 __u32 s_first_meta_bg; /* First metablock group */ 600 __u32 s_mkfs_time; /* When the filesystem was created */ 601 __u32 s_jnl_blocks[17]; /* Backup of the journal inode */ 602 __u32 s_blocks_count_hi; /* Blocks count high 32bits */ 603 __u32 s_r_blocks_count_hi; /* Reserved blocks count high 32 bits*/ 604 __u32 s_free_blocks_hi; /* Free blocks count */ 605 __u16 s_min_extra_isize; /* All inodes have at least # bytes */ 606 __u16 s_want_extra_isize; /* New inodes should reserve # bytes */ 607 __u32 s_flags; /* Miscellaneous flags */ 608 __u16 s_raid_stride; /* RAID stride */ 609 __u16 s_mmp_interval; /* # seconds to wait in MMP checking */ 610 __u64 s_mmp_block; /* Block for multi-mount protection */ 611 __u32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 612 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 613 __u8 s_reserved_char_pad; 614 __u16 s_reserved_pad; /* Padding to next 32bits */ 615 __u64 s_kbytes_written; /* nr of lifetime kilobytes written */ 616 __u32 s_snapshot_inum; /* Inode number of active snapshot */ 617 __u32 s_snapshot_id; /* sequential ID of active snapshot */ 618 __u64 s_snapshot_r_blocks_count; /* reserved blocks for active 619 snapshot's future use */ 620 __u32 s_snapshot_list; /* inode number of the head of the on-disk snapshot list */ 621#define EXT4_S_ERR_START ext4_offsetof(struct ext2_super_block, s_error_count) 622 __u32 s_error_count; /* number of fs errors */ 623 __u32 s_first_error_time; /* first time an error happened */ 624 __u32 s_first_error_ino; /* inode involved in first error */ 625 __u64 s_first_error_block; /* block involved of first error */ 626 __u8 s_first_error_func[32]; /* function where the error happened */ 627 __u32 s_first_error_line; /* line number where error happened */ 628 __u32 s_last_error_time; /* most recent time of an error */ 629 __u32 s_last_error_ino; /* inode involved in last error */ 630 __u32 s_last_error_line; /* line number where error happened */ 631 __u64 s_last_error_block; /* block involved of last error */ 632 __u8 s_last_error_func[32]; /* function where the error happened */ 633#define EXT4_S_ERR_END ext4_offsetof(struct ext2_super_block, s_mount_opts) 634 __u8 s_mount_opts[64]; 635 __u32 s_usr_quota_inum; /* inode number of user quota file */ 636 __u32 s_grp_quota_inum; /* inode number of group quota file */ 637 __u32 s_overhead_blocks; /* overhead blocks/clusters in fs */ 638 __u32 s_reserved[109]; /* Padding to the end of the block */ 639}; 640 641#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 642 643/* 644 * Codes for operating systems 645 */ 646#define EXT2_OS_LINUX 0 647#define EXT2_OS_HURD 1 648#define EXT2_OBSO_OS_MASIX 2 649#define EXT2_OS_FREEBSD 3 650#define EXT2_OS_LITES 4 651 652/* 653 * Revision levels 654 */ 655#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 656#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 657 658#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 659#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 660 661#define EXT2_GOOD_OLD_INODE_SIZE 128 662 663/* 664 * Journal inode backup types 665 */ 666#define EXT3_JNL_BACKUP_BLOCKS 1 667 668/* 669 * Feature set definitions 670 */ 671 672#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 673 ( EXT2_SB(sb)->s_feature_compat & (mask) ) 674#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 675 ( EXT2_SB(sb)->s_feature_ro_compat & (mask) ) 676#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 677 ( EXT2_SB(sb)->s_feature_incompat & (mask) ) 678 679#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 680#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 681#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 682#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 683#define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010 684#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 685#define EXT2_FEATURE_COMPAT_LAZY_BG 0x0040 686#define EXT2_FEATURE_COMPAT_EXCLUDE_INODE 0x0080 687 688#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 689#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 690/* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 not used */ 691#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 692#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 693#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 694#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 695#define EXT4_FEATURE_RO_COMPAT_HAS_SNAPSHOT 0x0080 696#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 697#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 698 699#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 700#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 701#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 702#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 703#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 704#define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040 705#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 706#define EXT4_FEATURE_INCOMPAT_MMP 0x0100 707#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 708#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 709#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 710 711#define EXT2_FEATURE_COMPAT_SUPP 0 712#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE) 713#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 714 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 715 EXT4_FEATURE_RO_COMPAT_DIR_NLINK| \ 716 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 717 718/* 719 * Default values for user and/or group using reserved blocks 720 */ 721#define EXT2_DEF_RESUID 0 722#define EXT2_DEF_RESGID 0 723 724/* 725 * Default mount options 726 */ 727#define EXT2_DEFM_DEBUG 0x0001 728#define EXT2_DEFM_BSDGROUPS 0x0002 729#define EXT2_DEFM_XATTR_USER 0x0004 730#define EXT2_DEFM_ACL 0x0008 731#define EXT2_DEFM_UID16 0x0010 732#define EXT3_DEFM_JMODE 0x0060 733#define EXT3_DEFM_JMODE_DATA 0x0020 734#define EXT3_DEFM_JMODE_ORDERED 0x0040 735#define EXT3_DEFM_JMODE_WBACK 0x0060 736#define EXT4_DEFM_NOBARRIER 0x0100 737#define EXT4_DEFM_BLOCK_VALIDITY 0x0200 738#define EXT4_DEFM_DISCARD 0x0400 739#define EXT4_DEFM_NODELALLOC 0x0800 740 741/* 742 * Structure of a directory entry 743 */ 744#define EXT2_NAME_LEN 255 745 746struct ext2_dir_entry { 747 __u32 inode; /* Inode number */ 748 __u16 rec_len; /* Directory entry length */ 749 __u16 name_len; /* Name length */ 750 char name[EXT2_NAME_LEN]; /* File name */ 751}; 752 753/* 754 * The new version of the directory entry. Since EXT2 structures are 755 * stored in intel byte order, and the name_len field could never be 756 * bigger than 255 chars, it's safe to reclaim the extra byte for the 757 * file_type field. 758 */ 759struct ext2_dir_entry_2 { 760 __u32 inode; /* Inode number */ 761 __u16 rec_len; /* Directory entry length */ 762 __u8 name_len; /* Name length */ 763 __u8 file_type; 764 char name[EXT2_NAME_LEN]; /* File name */ 765}; 766 767/* 768 * Ext2 directory file types. Only the low 3 bits are used. The 769 * other bits are reserved for now. 770 */ 771#define EXT2_FT_UNKNOWN 0 772#define EXT2_FT_REG_FILE 1 773#define EXT2_FT_DIR 2 774#define EXT2_FT_CHRDEV 3 775#define EXT2_FT_BLKDEV 4 776#define EXT2_FT_FIFO 5 777#define EXT2_FT_SOCK 6 778#define EXT2_FT_SYMLINK 7 779 780#define EXT2_FT_MAX 8 781 782/* 783 * EXT2_DIR_PAD defines the directory entries boundaries 784 * 785 * NOTE: It must be a multiple of 4 786 */ 787#define EXT2_DIR_PAD 4 788#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 789#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 790 ~EXT2_DIR_ROUND) 791 792/* 793 * This structure will be used for multiple mount protection. It will be 794 * written into the block number saved in the s_mmp_block field in the 795 * superblock. 796 */ 797#define EXT2_MMP_MAGIC 0x004D4D50 /* ASCII for MMP */ 798#define EXT2_MMP_CLEAN 0xFF4D4D50 /* Value of mmp_seq for clean unmount */ 799#define EXT2_MMP_FSCK_ON 0xE24D4D50 /* Value of mmp_seq when being fscked */ 800 801struct mmp_struct { 802 __u32 mmp_magic; 803 __u32 mmp_seq; 804 __u64 mmp_time; 805 char mmp_nodename[64]; 806 char mmp_bdevname[32]; 807 __u16 mmp_interval; 808 __u16 mmp_pad1; 809 __u32 mmp_pad2; 810}; 811 812/* 813 * Interval in number of seconds to update the MMP sequence number. 814 */ 815#define EXT2_MMP_DEF_INTERVAL 5 816 817#endif /* _LINUX_EXT2_FS_H */ 818