ext2_fs.h revision ae96c678e15eda2a5d0eea7e1067b449f6604aff
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_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 158 __u16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */ 159 __u16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */ 160 __u16 bg_itable_unused; /* Unused inodes count */ 161 __u16 bg_checksum; /* crc16(s_uuid+grouo_num+group_desc)*/ 162}; 163 164/* 165 * Structure of a blocks group descriptor 166 */ 167struct ext4_group_desc 168{ 169 __u32 bg_block_bitmap; /* Blocks bitmap block */ 170 __u32 bg_inode_bitmap; /* Inodes bitmap block */ 171 __u32 bg_inode_table; /* Inodes table block */ 172 __u16 bg_free_blocks_count; /* Free blocks count */ 173 __u16 bg_free_inodes_count; /* Free inodes count */ 174 __u16 bg_used_dirs_count; /* Directories count */ 175 __u16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 176 __u32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 177 __u16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */ 178 __u16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */ 179 __u16 bg_itable_unused; /* Unused inodes count */ 180 __u16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 181 __u32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 182 __u32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 183 __u32 bg_inode_table_hi; /* Inodes table block MSB */ 184 __u16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 185 __u16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 186 __u16 bg_used_dirs_count_hi; /* Directories count MSB */ 187 __u16 bg_itable_unused_hi; /* Unused inodes count MSB */ 188 __u32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 189 __u16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bitmap) MSB */ 190 __u16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bitmap) MSB */ 191 __u32 bg_reserved; 192}; 193 194#define EXT2_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not initialized */ 195#define EXT2_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not initialized */ 196#define EXT2_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 197 198/* 199 * Data structures used by the directory indexing feature 200 * 201 * Note: all of the multibyte integer fields are little endian. 202 */ 203 204/* 205 * Note: dx_root_info is laid out so that if it should somehow get 206 * overlaid by a dirent the two low bits of the hash version will be 207 * zero. Therefore, the hash version mod 4 should never be 0. 208 * Sincerely, the paranoia department. 209 */ 210struct ext2_dx_root_info { 211 __u32 reserved_zero; 212 __u8 hash_version; /* 0 now, 1 at release */ 213 __u8 info_length; /* 8 */ 214 __u8 indirect_levels; 215 __u8 unused_flags; 216}; 217 218#define EXT2_HASH_LEGACY 0 219#define EXT2_HASH_HALF_MD4 1 220#define EXT2_HASH_TEA 2 221#define EXT2_HASH_LEGACY_UNSIGNED 3 /* reserved for userspace lib */ 222#define EXT2_HASH_HALF_MD4_UNSIGNED 4 /* reserved for userspace lib */ 223#define EXT2_HASH_TEA_UNSIGNED 5 /* reserved for userspace lib */ 224 225#define EXT2_HASH_FLAG_INCOMPAT 0x1 226 227struct ext2_dx_entry { 228 __u32 hash; 229 __u32 block; 230}; 231 232struct ext2_dx_countlimit { 233 __u16 limit; 234 __u16 count; 235}; 236 237 238/* 239 * Macro-instructions used to manage group descriptors 240 */ 241#define EXT2_MIN_DESC_SIZE 32 242#define EXT2_MIN_DESC_SIZE_64BIT 64 243#define EXT2_MAX_DESC_SIZE EXT2_MIN_BLOCK_SIZE 244#define EXT2_DESC_SIZE(s) \ 245 ((EXT2_SB(s)->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) ? \ 246 (s)->s_desc_size : EXT2_MIN_DESC_SIZE) 247 248#define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 249#define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 250#define EXT2_CLUSTERS_PER_GROUP(s) (EXT2_SB(s)->s_clusters_per_group) 251#define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s)) 252/* limits imposed by 16-bit value gd_free_{blocks,inode}_count */ 253#define EXT2_MAX_BLOCKS_PER_GROUP(s) ((((unsigned) 1 << 16) - 8) * \ 254 (EXT2_CLUSTER_SIZE(s) / \ 255 EXT2_BLOCK_SIZE(s))) 256#define EXT2_MAX_CLUSTERS_PER_GROUP(s) (((unsigned) 1 << 16) - 8) 257#define EXT2_MAX_INODES_PER_GROUP(s) (((unsigned) 1 << 16) - \ 258 EXT2_INODES_PER_BLOCK(s)) 259#ifdef __KERNEL__ 260#define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) 261#define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 262#else 263#define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_DESC_SIZE(s)) 264#endif 265 266/* 267 * Constants relative to the data blocks 268 */ 269#define EXT2_NDIR_BLOCKS 12 270#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 271#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 272#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 273#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 274 275/* 276 * Inode flags 277 */ 278#define EXT2_SECRM_FL 0x00000001 /* Secure deletion */ 279#define EXT2_UNRM_FL 0x00000002 /* Undelete */ 280#define EXT2_COMPR_FL 0x00000004 /* Compress file */ 281#define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */ 282#define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */ 283#define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */ 284#define EXT2_NODUMP_FL 0x00000040 /* do not dump file */ 285#define EXT2_NOATIME_FL 0x00000080 /* do not update atime */ 286/* Reserved for compression usage... */ 287#define EXT2_DIRTY_FL 0x00000100 288#define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 289#define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */ 290#define EXT2_ECOMPR_FL 0x00000800 /* Compression error */ 291/* End compression flags --- maybe not all used */ 292#define EXT2_BTREE_FL 0x00001000 /* btree format dir */ 293#define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */ 294#define EXT2_IMAGIC_FL 0x00002000 295#define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 296#define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 297#define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */ 298#define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 299#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 300#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 301#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 302#define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 303#define EXT4_SNAPFILE_FL 0x01000000 /* Inode is a snapshot */ 304#define EXT4_SNAPFILE_DELETED_FL 0x04000000 /* Snapshot is being deleted */ 305#define EXT4_SNAPFILE_SHRUNK_FL 0x08000000 /* Snapshot shrink has completed */ 306#define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 307 308#define EXT2_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 309#define EXT2_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ 310 311/* 312 * ioctl commands 313 */ 314 315/* Used for online resize */ 316struct ext2_new_group_input { 317 __u32 group; /* Group number for this data */ 318 __u32 block_bitmap; /* Absolute block number of block bitmap */ 319 __u32 inode_bitmap; /* Absolute block number of inode bitmap */ 320 __u32 inode_table; /* Absolute block number of inode table start */ 321 __u32 blocks_count; /* Total number of blocks in this group */ 322 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 323 __u16 unused; /* Number of reserved GDT blocks in group */ 324}; 325 326struct ext4_new_group_input { 327 __u32 group; /* Group number for this data */ 328 __u64 block_bitmap; /* Absolute block number of block bitmap */ 329 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 330 __u64 inode_table; /* Absolute block number of inode table start */ 331 __u32 blocks_count; /* Total number of blocks in this group */ 332 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 333 __u16 unused; 334}; 335 336#ifdef __GNU__ /* Needed for the Hurd */ 337#define _IOT_ext2_new_group_input _IOT (_IOTS(__u32), 5, _IOTS(__u16), 2, 0, 0) 338#endif 339 340#define EXT2_IOC_GETFLAGS _IOR('f', 1, long) 341#define EXT2_IOC_SETFLAGS _IOW('f', 2, long) 342#define EXT2_IOC_GETVERSION _IOR('v', 1, long) 343#define EXT2_IOC_SETVERSION _IOW('v', 2, long) 344#define EXT2_IOC_GETVERSION_NEW _IOR('f', 3, long) 345#define EXT2_IOC_SETVERSION_NEW _IOW('f', 4, long) 346#define EXT2_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 347#define EXT2_IOC_GROUP_ADD _IOW('f', 8,struct ext2_new_group_input) 348#define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input) 349#define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 350 351/* 352 * Structure of an inode on the disk 353 */ 354struct ext2_inode { 355 __u16 i_mode; /* File mode */ 356 __u16 i_uid; /* Low 16 bits of Owner Uid */ 357 __u32 i_size; /* Size in bytes */ 358 __u32 i_atime; /* Access time */ 359 __u32 i_ctime; /* Inode change time */ 360 __u32 i_mtime; /* Modification time */ 361 __u32 i_dtime; /* Deletion Time */ 362 __u16 i_gid; /* Low 16 bits of Group Id */ 363 __u16 i_links_count; /* Links count */ 364 __u32 i_blocks; /* Blocks count */ 365 __u32 i_flags; /* File flags */ 366 union { 367 struct { 368 __u32 l_i_version; /* was l_i_reserved1 */ 369 } linux1; 370 struct { 371 __u32 h_i_translator; 372 } hurd1; 373 } osd1; /* OS dependent 1 */ 374 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 375 __u32 i_generation; /* File version (for NFS) */ 376 __u32 i_file_acl; /* File ACL */ 377 __u32 i_size_high; /* Formerly i_dir_acl, directory ACL */ 378 __u32 i_faddr; /* Fragment address */ 379 union { 380 struct { 381 __u16 l_i_blocks_hi; 382 __u16 l_i_file_acl_high; 383 __u16 l_i_uid_high; /* these 2 fields */ 384 __u16 l_i_gid_high; /* were reserved2[0] */ 385 __u16 l_i_checksum_lo; /* crc32c(uuid+inum+inode) */ 386 __u16 l_i_reserved; 387 } linux2; 388 struct { 389 __u8 h_i_frag; /* Fragment number */ 390 __u8 h_i_fsize; /* Fragment size */ 391 __u16 h_i_mode_high; 392 __u16 h_i_uid_high; 393 __u16 h_i_gid_high; 394 __u32 h_i_author; 395 } hurd2; 396 } osd2; /* OS dependent 2 */ 397}; 398 399/* 400 * Permanent part of an large inode on the disk 401 */ 402struct ext2_inode_large { 403 __u16 i_mode; /* File mode */ 404 __u16 i_uid; /* Low 16 bits of Owner Uid */ 405 __u32 i_size; /* Size in bytes */ 406 __u32 i_atime; /* Access time */ 407 __u32 i_ctime; /* Inode Change time */ 408 __u32 i_mtime; /* Modification time */ 409 __u32 i_dtime; /* Deletion Time */ 410 __u16 i_gid; /* Low 16 bits of Group Id */ 411 __u16 i_links_count; /* Links count */ 412 __u32 i_blocks; /* Blocks count */ 413 __u32 i_flags; /* File flags */ 414 union { 415 struct { 416 __u32 l_i_version; /* was l_i_reserved1 */ 417 } linux1; 418 struct { 419 __u32 h_i_translator; 420 } hurd1; 421 } osd1; /* OS dependent 1 */ 422 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 423 __u32 i_generation; /* File version (for NFS) */ 424 __u32 i_file_acl; /* File ACL */ 425 __u32 i_size_high; /* Formerly i_dir_acl, directory ACL */ 426 __u32 i_faddr; /* Fragment address */ 427 union { 428 struct { 429 __u16 l_i_blocks_hi; 430 __u16 l_i_file_acl_high; 431 __u16 l_i_uid_high; /* these 2 fields */ 432 __u16 l_i_gid_high; /* were reserved2[0] */ 433 __u16 l_i_checksum_lo; /* crc32c(uuid+inum+inode) */ 434 __u16 l_i_reserved; 435 } linux2; 436 struct { 437 __u8 h_i_frag; /* Fragment number */ 438 __u8 h_i_fsize; /* Fragment size */ 439 __u16 h_i_mode_high; 440 __u16 h_i_uid_high; 441 __u16 h_i_gid_high; 442 __u32 h_i_author; 443 } hurd2; 444 } osd2; /* OS dependent 2 */ 445 __u16 i_extra_isize; 446 __u16 i_checksum_hi; /* crc32c(uuid+inum+inode) */ 447 __u32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 448 __u32 i_mtime_extra; /* extra Modification time (nsec << 2 | epoch) */ 449 __u32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 450 __u32 i_crtime; /* File creation time */ 451 __u32 i_crtime_extra; /* extra File creation time (nsec << 2 | epoch)*/ 452 __u32 i_version_hi; /* high 32 bits for 64-bit version */ 453}; 454 455#define i_dir_acl i_size_high 456 457#if defined(__KERNEL__) || defined(__linux__) 458#define i_reserved1 osd1.linux1.l_i_reserved1 459#define i_frag osd2.linux2.l_i_frag 460#define i_fsize osd2.linux2.l_i_fsize 461#define i_uid_low i_uid 462#define i_gid_low i_gid 463#define i_uid_high osd2.linux2.l_i_uid_high 464#define i_gid_high osd2.linux2.l_i_gid_high 465#else 466#if defined(__GNU__) 467 468#define i_translator osd1.hurd1.h_i_translator 469#define i_frag osd2.hurd2.h_i_frag; 470#define i_fsize osd2.hurd2.h_i_fsize; 471#define i_uid_high osd2.hurd2.h_i_uid_high 472#define i_gid_high osd2.hurd2.h_i_gid_high 473#define i_author osd2.hurd2.h_i_author 474 475#endif /* __GNU__ */ 476#endif /* defined(__KERNEL__) || defined(__linux__) */ 477 478#define inode_uid(inode) ((inode).i_uid | (inode).osd2.linux2.l_i_uid_high << 16) 479#define inode_gid(inode) ((inode).i_gid | (inode).osd2.linux2.l_i_gid_high << 16) 480#define ext2fs_set_i_uid_high(inode,x) ((inode).osd2.linux2.l_i_uid_high = (x)) 481#define ext2fs_set_i_gid_high(inode,x) ((inode).osd2.linux2.l_i_gid_high = (x)) 482 483/* 484 * File system states 485 */ 486#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 487#define EXT2_ERROR_FS 0x0002 /* Errors detected */ 488#define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */ 489 490/* 491 * Misc. filesystem flags 492 */ 493#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 494#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 495#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* OK for use on development code */ 496#define EXT2_FLAGS_IS_SNAPSHOT 0x0010 /* This is a snapshot image */ 497#define EXT2_FLAGS_FIX_SNAPSHOT 0x0020 /* Snapshot inodes corrupted */ 498#define EXT2_FLAGS_FIX_EXCLUDE 0x0040 /* Exclude bitmaps corrupted */ 499 500/* 501 * Mount flags 502 */ 503#define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */ 504#define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */ 505#define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */ 506#define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ 507#define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ 508#define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ 509#define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */ 510#define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */ 511 512#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 513#define set_opt(o, opt) o |= EXT2_MOUNT_##opt 514#define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 515 EXT2_MOUNT_##opt) 516/* 517 * Maximal mount counts between two filesystem checks 518 */ 519#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 520#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 521 522/* 523 * Behaviour when detecting errors 524 */ 525#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 526#define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 527#define EXT2_ERRORS_PANIC 3 /* Panic */ 528#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 529 530#if (__GNUC__ >= 4) 531#define ext4_offsetof(TYPE,MEMBER) __builtin_offsetof(TYPE,MEMBER) 532#else 533#define ext4_offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) 534#endif 535 536/* 537 * Structure of the super block 538 */ 539struct ext2_super_block { 540 __u32 s_inodes_count; /* Inodes count */ 541 __u32 s_blocks_count; /* Blocks count */ 542 __u32 s_r_blocks_count; /* Reserved blocks count */ 543 __u32 s_free_blocks_count; /* Free blocks count */ 544 __u32 s_free_inodes_count; /* Free inodes count */ 545 __u32 s_first_data_block; /* First Data Block */ 546 __u32 s_log_block_size; /* Block size */ 547 __u32 s_log_cluster_size; /* Allocation cluster size */ 548 __u32 s_blocks_per_group; /* # Blocks per group */ 549 __u32 s_clusters_per_group; /* # Fragments per group */ 550 __u32 s_inodes_per_group; /* # Inodes per group */ 551 __u32 s_mtime; /* Mount time */ 552 __u32 s_wtime; /* Write time */ 553 __u16 s_mnt_count; /* Mount count */ 554 __s16 s_max_mnt_count; /* Maximal mount count */ 555 __u16 s_magic; /* Magic signature */ 556 __u16 s_state; /* File system state */ 557 __u16 s_errors; /* Behaviour when detecting errors */ 558 __u16 s_minor_rev_level; /* minor revision level */ 559 __u32 s_lastcheck; /* time of last check */ 560 __u32 s_checkinterval; /* max. time between checks */ 561 __u32 s_creator_os; /* OS */ 562 __u32 s_rev_level; /* Revision level */ 563 __u16 s_def_resuid; /* Default uid for reserved blocks */ 564 __u16 s_def_resgid; /* Default gid for reserved blocks */ 565 /* 566 * These fields are for EXT2_DYNAMIC_REV superblocks only. 567 * 568 * Note: the difference between the compatible feature set and 569 * the incompatible feature set is that if there is a bit set 570 * in the incompatible feature set that the kernel doesn't 571 * know about, it should refuse to mount the filesystem. 572 * 573 * e2fsck's requirements are more strict; if it doesn't know 574 * about a feature in either the compatible or incompatible 575 * feature set, it must abort and not try to meddle with 576 * things it doesn't understand... 577 */ 578 __u32 s_first_ino; /* First non-reserved inode */ 579 __u16 s_inode_size; /* size of inode structure */ 580 __u16 s_block_group_nr; /* block group # of this superblock */ 581 __u32 s_feature_compat; /* compatible feature set */ 582 __u32 s_feature_incompat; /* incompatible feature set */ 583 __u32 s_feature_ro_compat; /* readonly-compatible feature set */ 584 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 585 char s_volume_name[16]; /* volume name */ 586 char s_last_mounted[64]; /* directory where last mounted */ 587 __u32 s_algorithm_usage_bitmap; /* For compression */ 588 /* 589 * Performance hints. Directory preallocation should only 590 * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on. 591 */ 592 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 593 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 594 __u16 s_reserved_gdt_blocks; /* Per group table for online growth */ 595 /* 596 * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set. 597 */ 598 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 599 __u32 s_journal_inum; /* inode number of journal file */ 600 __u32 s_journal_dev; /* device number of journal file */ 601 __u32 s_last_orphan; /* start of list of inodes to delete */ 602 __u32 s_hash_seed[4]; /* HTREE hash seed */ 603 __u8 s_def_hash_version; /* Default hash version to use */ 604 __u8 s_jnl_backup_type; /* Default type of journal backup */ 605 __u16 s_desc_size; /* Group desc. size: INCOMPAT_64BIT */ 606 __u32 s_default_mount_opts; 607 __u32 s_first_meta_bg; /* First metablock group */ 608 __u32 s_mkfs_time; /* When the filesystem was created */ 609 __u32 s_jnl_blocks[17]; /* Backup of the journal inode */ 610 __u32 s_blocks_count_hi; /* Blocks count high 32bits */ 611 __u32 s_r_blocks_count_hi; /* Reserved blocks count high 32 bits*/ 612 __u32 s_free_blocks_hi; /* Free blocks count */ 613 __u16 s_min_extra_isize; /* All inodes have at least # bytes */ 614 __u16 s_want_extra_isize; /* New inodes should reserve # bytes */ 615 __u32 s_flags; /* Miscellaneous flags */ 616 __u16 s_raid_stride; /* RAID stride */ 617 __u16 s_mmp_interval; /* # seconds to wait in MMP checking */ 618 __u64 s_mmp_block; /* Block for multi-mount protection */ 619 __u32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 620 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 621 __u8 s_reserved_char_pad; 622 __u16 s_reserved_pad; /* Padding to next 32bits */ 623 __u64 s_kbytes_written; /* nr of lifetime kilobytes written */ 624 __u32 s_snapshot_inum; /* Inode number of active snapshot */ 625 __u32 s_snapshot_id; /* sequential ID of active snapshot */ 626 __u64 s_snapshot_r_blocks_count; /* reserved blocks for active 627 snapshot's future use */ 628 __u32 s_snapshot_list; /* inode number of the head of the on-disk snapshot list */ 629#define EXT4_S_ERR_START ext4_offsetof(struct ext2_super_block, s_error_count) 630 __u32 s_error_count; /* number of fs errors */ 631 __u32 s_first_error_time; /* first time an error happened */ 632 __u32 s_first_error_ino; /* inode involved in first error */ 633 __u64 s_first_error_block; /* block involved of first error */ 634 __u8 s_first_error_func[32]; /* function where the error happened */ 635 __u32 s_first_error_line; /* line number where error happened */ 636 __u32 s_last_error_time; /* most recent time of an error */ 637 __u32 s_last_error_ino; /* inode involved in last error */ 638 __u32 s_last_error_line; /* line number where error happened */ 639 __u64 s_last_error_block; /* block involved of last error */ 640 __u8 s_last_error_func[32]; /* function where the error happened */ 641#define EXT4_S_ERR_END ext4_offsetof(struct ext2_super_block, s_mount_opts) 642 __u8 s_mount_opts[64]; 643 __u32 s_usr_quota_inum; /* inode number of user quota file */ 644 __u32 s_grp_quota_inum; /* inode number of group quota file */ 645 __u32 s_overhead_blocks; /* overhead blocks/clusters in fs */ 646 __u32 s_reserved[108]; /* Padding to the end of the block */ 647 __u32 s_checksum; /* crc32c(superblock) */ 648}; 649 650#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 651 652/* 653 * Codes for operating systems 654 */ 655#define EXT2_OS_LINUX 0 656#define EXT2_OS_HURD 1 657#define EXT2_OBSO_OS_MASIX 2 658#define EXT2_OS_FREEBSD 3 659#define EXT2_OS_LITES 4 660 661/* 662 * Revision levels 663 */ 664#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 665#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 666 667#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 668#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 669 670#define EXT2_GOOD_OLD_INODE_SIZE 128 671 672/* 673 * Journal inode backup types 674 */ 675#define EXT3_JNL_BACKUP_BLOCKS 1 676 677/* 678 * Feature set definitions 679 */ 680 681#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 682 ( EXT2_SB(sb)->s_feature_compat & (mask) ) 683#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 684 ( EXT2_SB(sb)->s_feature_ro_compat & (mask) ) 685#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 686 ( EXT2_SB(sb)->s_feature_incompat & (mask) ) 687 688#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 689#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 690#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 691#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 692#define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010 693#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 694#define EXT2_FEATURE_COMPAT_LAZY_BG 0x0040 695/* #define EXT2_FEATURE_COMPAT_EXCLUDE_INODE 0x0080 not used, legacy */ 696#define EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP 0x0100 697 698 699#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 700#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 701/* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 not used */ 702#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 703#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 704#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 705#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 706#define EXT4_FEATURE_RO_COMPAT_HAS_SNAPSHOT 0x0080 707#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 708#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 709#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 710 711#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 712#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 713#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 714#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 715#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 716#define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040 717#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 718#define EXT4_FEATURE_INCOMPAT_MMP 0x0100 719#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 720#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 721#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 722 723#define EXT2_FEATURE_COMPAT_SUPP 0 724#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE) 725#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 726 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 727 EXT4_FEATURE_RO_COMPAT_DIR_NLINK| \ 728 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 729 730/* 731 * Default values for user and/or group using reserved blocks 732 */ 733#define EXT2_DEF_RESUID 0 734#define EXT2_DEF_RESGID 0 735 736/* 737 * Default mount options 738 */ 739#define EXT2_DEFM_DEBUG 0x0001 740#define EXT2_DEFM_BSDGROUPS 0x0002 741#define EXT2_DEFM_XATTR_USER 0x0004 742#define EXT2_DEFM_ACL 0x0008 743#define EXT2_DEFM_UID16 0x0010 744#define EXT3_DEFM_JMODE 0x0060 745#define EXT3_DEFM_JMODE_DATA 0x0020 746#define EXT3_DEFM_JMODE_ORDERED 0x0040 747#define EXT3_DEFM_JMODE_WBACK 0x0060 748#define EXT4_DEFM_NOBARRIER 0x0100 749#define EXT4_DEFM_BLOCK_VALIDITY 0x0200 750#define EXT4_DEFM_DISCARD 0x0400 751#define EXT4_DEFM_NODELALLOC 0x0800 752 753/* 754 * Structure of a directory entry 755 */ 756#define EXT2_NAME_LEN 255 757 758struct ext2_dir_entry { 759 __u32 inode; /* Inode number */ 760 __u16 rec_len; /* Directory entry length */ 761 __u16 name_len; /* Name length */ 762 char name[EXT2_NAME_LEN]; /* File name */ 763}; 764 765/* 766 * The new version of the directory entry. Since EXT2 structures are 767 * stored in intel byte order, and the name_len field could never be 768 * bigger than 255 chars, it's safe to reclaim the extra byte for the 769 * file_type field. 770 */ 771struct ext2_dir_entry_2 { 772 __u32 inode; /* Inode number */ 773 __u16 rec_len; /* Directory entry length */ 774 __u8 name_len; /* Name length */ 775 __u8 file_type; 776 char name[EXT2_NAME_LEN]; /* File name */ 777}; 778 779/* 780 * Ext2 directory file types. Only the low 3 bits are used. The 781 * other bits are reserved for now. 782 */ 783#define EXT2_FT_UNKNOWN 0 784#define EXT2_FT_REG_FILE 1 785#define EXT2_FT_DIR 2 786#define EXT2_FT_CHRDEV 3 787#define EXT2_FT_BLKDEV 4 788#define EXT2_FT_FIFO 5 789#define EXT2_FT_SOCK 6 790#define EXT2_FT_SYMLINK 7 791 792#define EXT2_FT_MAX 8 793 794/* 795 * EXT2_DIR_PAD defines the directory entries boundaries 796 * 797 * NOTE: It must be a multiple of 4 798 */ 799#define EXT2_DIR_PAD 4 800#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 801#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 802 ~EXT2_DIR_ROUND) 803 804/* 805 * This structure will be used for multiple mount protection. It will be 806 * written into the block number saved in the s_mmp_block field in the 807 * superblock. 808 */ 809#define EXT2_MMP_MAGIC 0x004D4D50 /* ASCII for MMP */ 810#define EXT2_MMP_CLEAN 0xFF4D4D50 /* Value of mmp_seq for clean unmount */ 811#define EXT2_MMP_FSCK_ON 0xE24D4D50 /* Value of mmp_seq when being fscked */ 812 813struct mmp_struct { 814 __u32 mmp_magic; 815 __u32 mmp_seq; 816 __u64 mmp_time; 817 char mmp_nodename[64]; 818 char mmp_bdevname[32]; 819 __u16 mmp_interval; 820 __u16 mmp_pad1; 821 __u32 mmp_pad2; 822}; 823 824/* 825 * Interval in number of seconds to update the MMP sequence number. 826 */ 827#define EXT2_MMP_DEF_INTERVAL 5 828 829#endif /* _LINUX_EXT2_FS_H */ 830