ext2_fs.h revision d32c915abfb224f6f6659e9cada7e9f759b7e3d2
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 * ACL structures 113 */ 114struct ext2_acl_header /* Header of Access Control Lists */ 115{ 116 __u32 aclh_size; 117 __u32 aclh_file_count; 118 __u32 aclh_acle_count; 119 __u32 aclh_first_acle; 120}; 121 122struct ext2_acl_entry /* Access Control List Entry */ 123{ 124 __u32 acle_size; 125 __u16 acle_perms; /* Access permissions */ 126 __u16 acle_type; /* Type of entry */ 127 __u16 acle_tag; /* User or group identity */ 128 __u16 acle_pad1; 129 __u32 acle_next; /* Pointer on next entry for the */ 130 /* same inode or on next free entry */ 131}; 132 133/* 134 * Structure of a blocks group descriptor 135 */ 136struct ext2_group_desc 137{ 138 __u32 bg_block_bitmap; /* Blocks bitmap block */ 139 __u32 bg_inode_bitmap; /* Inodes bitmap block */ 140 __u32 bg_inode_table; /* Inodes table block */ 141 __u16 bg_free_blocks_count; /* Free blocks count */ 142 __u16 bg_free_inodes_count; /* Free inodes count */ 143 __u16 bg_used_dirs_count; /* Directories count */ 144 __u16 bg_flags; 145 __u32 bg_reserved[2]; 146 __u16 bg_itable_unused; /* Unused inodes count */ 147 __u16 bg_checksum; /* crc16(s_uuid+grouo_num+group_desc)*/ 148}; 149 150/* 151 * Structure of a blocks group descriptor 152 */ 153struct ext4_group_desc 154{ 155 __u32 bg_block_bitmap; /* Blocks bitmap block */ 156 __u32 bg_inode_bitmap; /* Inodes bitmap block */ 157 __u32 bg_inode_table; /* Inodes table block */ 158 __u16 bg_free_blocks_count; /* Free blocks count */ 159 __u16 bg_free_inodes_count; /* Free inodes count */ 160 __u16 bg_used_dirs_count; /* Directories count */ 161 __u16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 162 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ 163 __u16 bg_itable_unused; /* Unused inodes count */ 164 __u16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 165 __u32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 166 __u32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 167 __u32 bg_inode_table_hi; /* Inodes table block MSB */ 168 __u16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 169 __u16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 170 __u16 bg_used_dirs_count_hi; /* Directories count MSB */ 171 __u16 bg_itable_unused_hi; /* Unused inodes count MSB */ 172 __u32 bg_reserved2[3]; 173}; 174 175#define EXT2_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not initialized */ 176#define EXT2_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not initialized */ 177#define EXT2_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 178 179/* 180 * Data structures used by the directory indexing feature 181 * 182 * Note: all of the multibyte integer fields are little endian. 183 */ 184 185/* 186 * Note: dx_root_info is laid out so that if it should somehow get 187 * overlaid by a dirent the two low bits of the hash version will be 188 * zero. Therefore, the hash version mod 4 should never be 0. 189 * Sincerely, the paranoia department. 190 */ 191struct ext2_dx_root_info { 192 __u32 reserved_zero; 193 __u8 hash_version; /* 0 now, 1 at release */ 194 __u8 info_length; /* 8 */ 195 __u8 indirect_levels; 196 __u8 unused_flags; 197}; 198 199#define EXT2_HASH_LEGACY 0 200#define EXT2_HASH_HALF_MD4 1 201#define EXT2_HASH_TEA 2 202#define EXT2_HASH_LEGACY_UNSIGNED 3 /* reserved for userspace lib */ 203#define EXT2_HASH_HALF_MD4_UNSIGNED 4 /* reserved for userspace lib */ 204#define EXT2_HASH_TEA_UNSIGNED 5 /* reserved for userspace lib */ 205 206#define EXT2_HASH_FLAG_INCOMPAT 0x1 207 208struct ext2_dx_entry { 209 __u32 hash; 210 __u32 block; 211}; 212 213struct ext2_dx_countlimit { 214 __u16 limit; 215 __u16 count; 216}; 217 218 219/* 220 * Macro-instructions used to manage group descriptors 221 */ 222#define EXT2_MIN_DESC_SIZE 32 223#define EXT2_MIN_DESC_SIZE_64BIT 64 224#define EXT2_MAX_DESC_SIZE EXT2_MIN_BLOCK_SIZE 225#define EXT2_DESC_SIZE(s) \ 226 ((EXT2_SB(s)->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) ? \ 227 (s)->s_desc_size : EXT2_MIN_DESC_SIZE) 228 229#define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 230#define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 231#define EXT2_CLUSTERS_PER_GROUP(s) (EXT2_SB(s)->s_clusters_per_group) 232#define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s)) 233/* limits imposed by 16-bit value gd_free_{blocks,inode}_count */ 234#define EXT2_MAX_BLOCKS_PER_GROUP(s) ((((unsigned) 1 << 16) - 8) * \ 235 (EXT2_CLUSTER_SIZE(s) / \ 236 EXT2_BLOCK_SIZE(s))) 237#define EXT2_MAX_CLUSTERS_PER_GROUP(s) (((unsigned) 1 << 16) - 8) 238#define EXT2_MAX_INODES_PER_GROUP(s) (((unsigned) 1 << 16) - \ 239 EXT2_INODES_PER_BLOCK(s)) 240#ifdef __KERNEL__ 241#define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) 242#define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 243#else 244#define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_DESC_SIZE(s)) 245#endif 246 247/* 248 * Constants relative to the data blocks 249 */ 250#define EXT2_NDIR_BLOCKS 12 251#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 252#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 253#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 254#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 255 256/* 257 * Inode flags 258 */ 259#define EXT2_SECRM_FL 0x00000001 /* Secure deletion */ 260#define EXT2_UNRM_FL 0x00000002 /* Undelete */ 261#define EXT2_COMPR_FL 0x00000004 /* Compress file */ 262#define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */ 263#define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */ 264#define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */ 265#define EXT2_NODUMP_FL 0x00000040 /* do not dump file */ 266#define EXT2_NOATIME_FL 0x00000080 /* do not update atime */ 267/* Reserved for compression usage... */ 268#define EXT2_DIRTY_FL 0x00000100 269#define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 270#define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */ 271#define EXT2_ECOMPR_FL 0x00000800 /* Compression error */ 272/* End compression flags --- maybe not all used */ 273#define EXT2_BTREE_FL 0x00001000 /* btree format dir */ 274#define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */ 275#define EXT2_IMAGIC_FL 0x00002000 276#define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 277#define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 278#define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */ 279#define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 280#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 281#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 282#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 283#define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 284#define EXT4_SNAPFILE_FL 0x01000000 /* Inode is a snapshot */ 285#define EXT4_SNAPFILE_DELETED_FL 0x04000000 /* Snapshot is being deleted */ 286#define EXT4_SNAPFILE_SHRUNK_FL 0x08000000 /* Snapshot shrink has completed */ 287#define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 288 289#define EXT2_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 290#define EXT2_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ 291 292/* 293 * ioctl commands 294 */ 295 296/* Used for online resize */ 297struct ext2_new_group_input { 298 __u32 group; /* Group number for this data */ 299 __u32 block_bitmap; /* Absolute block number of block bitmap */ 300 __u32 inode_bitmap; /* Absolute block number of inode bitmap */ 301 __u32 inode_table; /* Absolute block number of inode table start */ 302 __u32 blocks_count; /* Total number of blocks in this group */ 303 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 304 __u16 unused; /* Number of reserved GDT blocks in group */ 305}; 306 307struct ext4_new_group_input { 308 __u32 group; /* Group number for this data */ 309 __u64 block_bitmap; /* Absolute block number of block bitmap */ 310 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 311 __u64 inode_table; /* Absolute block number of inode table start */ 312 __u32 blocks_count; /* Total number of blocks in this group */ 313 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 314 __u16 unused; 315}; 316 317#ifdef __GNU__ /* Needed for the Hurd */ 318#define _IOT_ext2_new_group_input _IOT (_IOTS(__u32), 5, _IOTS(__u16), 2, 0, 0) 319#endif 320 321#define EXT2_IOC_GETFLAGS _IOR('f', 1, long) 322#define EXT2_IOC_SETFLAGS _IOW('f', 2, long) 323#define EXT2_IOC_GETVERSION _IOR('v', 1, long) 324#define EXT2_IOC_SETVERSION _IOW('v', 2, long) 325#define EXT2_IOC_GETVERSION_NEW _IOR('f', 3, long) 326#define EXT2_IOC_SETVERSION_NEW _IOW('f', 4, long) 327#define EXT2_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 328#define EXT2_IOC_GROUP_ADD _IOW('f', 8,struct ext2_new_group_input) 329#define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input) 330 331/* 332 * Structure of an inode on the disk 333 */ 334struct ext2_inode { 335 __u16 i_mode; /* File mode */ 336 __u16 i_uid; /* Low 16 bits of Owner Uid */ 337 __u32 i_size; /* Size in bytes */ 338 __u32 i_atime; /* Access time */ 339 __u32 i_ctime; /* Inode change time */ 340 __u32 i_mtime; /* Modification time */ 341 __u32 i_dtime; /* Deletion Time */ 342 __u16 i_gid; /* Low 16 bits of Group Id */ 343 __u16 i_links_count; /* Links count */ 344 __u32 i_blocks; /* Blocks count */ 345 __u32 i_flags; /* File flags */ 346 union { 347 struct { 348 __u32 l_i_version; /* was l_i_reserved1 */ 349 } linux1; 350 struct { 351 __u32 h_i_translator; 352 } hurd1; 353 } osd1; /* OS dependent 1 */ 354 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 355 __u32 i_generation; /* File version (for NFS) */ 356 __u32 i_file_acl; /* File ACL */ 357 __u32 i_size_high; /* Formerly i_dir_acl, directory ACL */ 358 __u32 i_faddr; /* Fragment address */ 359 union { 360 struct { 361 __u16 l_i_blocks_hi; 362 __u16 l_i_file_acl_high; 363 __u16 l_i_uid_high; /* these 2 fields */ 364 __u16 l_i_gid_high; /* were reserved2[0] */ 365 __u32 l_i_reserved2; 366 } linux2; 367 struct { 368 __u8 h_i_frag; /* Fragment number */ 369 __u8 h_i_fsize; /* Fragment size */ 370 __u16 h_i_mode_high; 371 __u16 h_i_uid_high; 372 __u16 h_i_gid_high; 373 __u32 h_i_author; 374 } hurd2; 375 } osd2; /* OS dependent 2 */ 376}; 377 378/* 379 * Permanent part of an large inode on the disk 380 */ 381struct ext2_inode_large { 382 __u16 i_mode; /* File mode */ 383 __u16 i_uid; /* Low 16 bits of Owner Uid */ 384 __u32 i_size; /* Size in bytes */ 385 __u32 i_atime; /* Access time */ 386 __u32 i_ctime; /* Inode Change time */ 387 __u32 i_mtime; /* Modification time */ 388 __u32 i_dtime; /* Deletion Time */ 389 __u16 i_gid; /* Low 16 bits of Group Id */ 390 __u16 i_links_count; /* Links count */ 391 __u32 i_blocks; /* Blocks count */ 392 __u32 i_flags; /* File flags */ 393 union { 394 struct { 395 __u32 l_i_version; /* was l_i_reserved1 */ 396 } linux1; 397 struct { 398 __u32 h_i_translator; 399 } hurd1; 400 } osd1; /* OS dependent 1 */ 401 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 402 __u32 i_generation; /* File version (for NFS) */ 403 __u32 i_file_acl; /* File ACL */ 404 __u32 i_size_high; /* Formerly i_dir_acl, directory ACL */ 405 __u32 i_faddr; /* Fragment address */ 406 union { 407 struct { 408 __u16 l_i_blocks_hi; 409 __u16 l_i_file_acl_high; 410 __u16 l_i_uid_high; /* these 2 fields */ 411 __u16 l_i_gid_high; /* were reserved2[0] */ 412 __u32 l_i_reserved2; 413 } linux2; 414 struct { 415 __u8 h_i_frag; /* Fragment number */ 416 __u8 h_i_fsize; /* Fragment size */ 417 __u16 h_i_mode_high; 418 __u16 h_i_uid_high; 419 __u16 h_i_gid_high; 420 __u32 h_i_author; 421 } hurd2; 422 } osd2; /* OS dependent 2 */ 423 __u16 i_extra_isize; 424 __u16 i_pad1; 425 __u32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 426 __u32 i_mtime_extra; /* extra Modification time (nsec << 2 | epoch) */ 427 __u32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 428 __u32 i_crtime; /* File creation time */ 429 __u32 i_crtime_extra; /* extra File creation time (nsec << 2 | epoch)*/ 430 __u32 i_version_hi; /* high 32 bits for 64-bit version */ 431}; 432 433#define i_dir_acl i_size_high 434 435#if defined(__KERNEL__) || defined(__linux__) 436#define i_reserved1 osd1.linux1.l_i_reserved1 437#define i_frag osd2.linux2.l_i_frag 438#define i_fsize osd2.linux2.l_i_fsize 439#define i_uid_low i_uid 440#define i_gid_low i_gid 441#define i_uid_high osd2.linux2.l_i_uid_high 442#define i_gid_high osd2.linux2.l_i_gid_high 443#define i_reserved2 osd2.linux2.l_i_reserved2 444#else 445#if defined(__GNU__) 446 447#define i_translator osd1.hurd1.h_i_translator 448#define i_frag osd2.hurd2.h_i_frag; 449#define i_fsize osd2.hurd2.h_i_fsize; 450#define i_uid_high osd2.hurd2.h_i_uid_high 451#define i_gid_high osd2.hurd2.h_i_gid_high 452#define i_author osd2.hurd2.h_i_author 453 454#endif /* __GNU__ */ 455#endif /* defined(__KERNEL__) || defined(__linux__) */ 456 457#define inode_uid(inode) ((inode).i_uid | (inode).osd2.linux2.l_i_uid_high << 16) 458#define inode_gid(inode) ((inode).i_gid | (inode).osd2.linux2.l_i_gid_high << 16) 459#define ext2fs_set_i_uid_high(inode,x) ((inode).osd2.linux2.l_i_uid_high = (x)) 460#define ext2fs_set_i_gid_high(inode,x) ((inode).osd2.linux2.l_i_gid_high = (x)) 461 462/* 463 * File system states 464 */ 465#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 466#define EXT2_ERROR_FS 0x0002 /* Errors detected */ 467#define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */ 468 469/* 470 * Misc. filesystem flags 471 */ 472#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 473#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 474#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* OK for use on development code */ 475#define EXT2_FLAGS_IS_SNAPSHOT 0x0010 /* This is a snapshot image */ 476#define EXT2_FLAGS_FIX_SNAPSHOT 0x0020 /* Snapshot inodes corrupted */ 477#define EXT2_FLAGS_FIX_EXCLUDE 0x0040 /* Exclude bitmaps corrupted */ 478 479/* 480 * Mount flags 481 */ 482#define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */ 483#define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */ 484#define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */ 485#define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ 486#define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ 487#define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ 488#define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */ 489#define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */ 490 491#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 492#define set_opt(o, opt) o |= EXT2_MOUNT_##opt 493#define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 494 EXT2_MOUNT_##opt) 495/* 496 * Maximal mount counts between two filesystem checks 497 */ 498#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 499#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 500 501/* 502 * Behaviour when detecting errors 503 */ 504#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 505#define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 506#define EXT2_ERRORS_PANIC 3 /* Panic */ 507#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 508 509#if (__GNUC__ >= 4) 510#define ext4_offsetof(TYPE,MEMBER) __builtin_offsetof(TYPE,MEMBER) 511#else 512#define ext4_offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) 513#endif 514 515/* 516 * Structure of the super block 517 */ 518struct ext2_super_block { 519 __u32 s_inodes_count; /* Inodes count */ 520 __u32 s_blocks_count; /* Blocks count */ 521 __u32 s_r_blocks_count; /* Reserved blocks count */ 522 __u32 s_free_blocks_count; /* Free blocks count */ 523 __u32 s_free_inodes_count; /* Free inodes count */ 524 __u32 s_first_data_block; /* First Data Block */ 525 __u32 s_log_block_size; /* Block size */ 526 __u32 s_log_cluster_size; /* Allocation cluster size */ 527 __u32 s_blocks_per_group; /* # Blocks per group */ 528 __u32 s_clusters_per_group; /* # Fragments per group */ 529 __u32 s_inodes_per_group; /* # Inodes per group */ 530 __u32 s_mtime; /* Mount time */ 531 __u32 s_wtime; /* Write time */ 532 __u16 s_mnt_count; /* Mount count */ 533 __s16 s_max_mnt_count; /* Maximal mount count */ 534 __u16 s_magic; /* Magic signature */ 535 __u16 s_state; /* File system state */ 536 __u16 s_errors; /* Behaviour when detecting errors */ 537 __u16 s_minor_rev_level; /* minor revision level */ 538 __u32 s_lastcheck; /* time of last check */ 539 __u32 s_checkinterval; /* max. time between checks */ 540 __u32 s_creator_os; /* OS */ 541 __u32 s_rev_level; /* Revision level */ 542 __u16 s_def_resuid; /* Default uid for reserved blocks */ 543 __u16 s_def_resgid; /* Default gid for reserved blocks */ 544 /* 545 * These fields are for EXT2_DYNAMIC_REV superblocks only. 546 * 547 * Note: the difference between the compatible feature set and 548 * the incompatible feature set is that if there is a bit set 549 * in the incompatible feature set that the kernel doesn't 550 * know about, it should refuse to mount the filesystem. 551 * 552 * e2fsck's requirements are more strict; if it doesn't know 553 * about a feature in either the compatible or incompatible 554 * feature set, it must abort and not try to meddle with 555 * things it doesn't understand... 556 */ 557 __u32 s_first_ino; /* First non-reserved inode */ 558 __u16 s_inode_size; /* size of inode structure */ 559 __u16 s_block_group_nr; /* block group # of this superblock */ 560 __u32 s_feature_compat; /* compatible feature set */ 561 __u32 s_feature_incompat; /* incompatible feature set */ 562 __u32 s_feature_ro_compat; /* readonly-compatible feature set */ 563 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 564 char s_volume_name[16]; /* volume name */ 565 char s_last_mounted[64]; /* directory where last mounted */ 566 __u32 s_algorithm_usage_bitmap; /* For compression */ 567 /* 568 * Performance hints. Directory preallocation should only 569 * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on. 570 */ 571 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 572 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 573 __u16 s_reserved_gdt_blocks; /* Per group table for online growth */ 574 /* 575 * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set. 576 */ 577 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 578 __u32 s_journal_inum; /* inode number of journal file */ 579 __u32 s_journal_dev; /* device number of journal file */ 580 __u32 s_last_orphan; /* start of list of inodes to delete */ 581 __u32 s_hash_seed[4]; /* HTREE hash seed */ 582 __u8 s_def_hash_version; /* Default hash version to use */ 583 __u8 s_jnl_backup_type; /* Default type of journal backup */ 584 __u16 s_desc_size; /* Group desc. size: INCOMPAT_64BIT */ 585 __u32 s_default_mount_opts; 586 __u32 s_first_meta_bg; /* First metablock group */ 587 __u32 s_mkfs_time; /* When the filesystem was created */ 588 __u32 s_jnl_blocks[17]; /* Backup of the journal inode */ 589 __u32 s_blocks_count_hi; /* Blocks count high 32bits */ 590 __u32 s_r_blocks_count_hi; /* Reserved blocks count high 32 bits*/ 591 __u32 s_free_blocks_hi; /* Free blocks count */ 592 __u16 s_min_extra_isize; /* All inodes have at least # bytes */ 593 __u16 s_want_extra_isize; /* New inodes should reserve # bytes */ 594 __u32 s_flags; /* Miscellaneous flags */ 595 __u16 s_raid_stride; /* RAID stride */ 596 __u16 s_mmp_interval; /* # seconds to wait in MMP checking */ 597 __u64 s_mmp_block; /* Block for multi-mount protection */ 598 __u32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 599 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 600 __u8 s_reserved_char_pad; 601 __u16 s_reserved_pad; /* Padding to next 32bits */ 602 __u64 s_kbytes_written; /* nr of lifetime kilobytes written */ 603 __u32 s_snapshot_inum; /* Inode number of active snapshot */ 604 __u32 s_snapshot_id; /* sequential ID of active snapshot */ 605 __u64 s_snapshot_r_blocks_count; /* reserved blocks for active 606 snapshot's future use */ 607 __u32 s_snapshot_list; /* inode number of the head of the on-disk snapshot list */ 608#define EXT4_S_ERR_START ext4_offsetof(struct ext2_super_block, s_error_count) 609 __u32 s_error_count; /* number of fs errors */ 610 __u32 s_first_error_time; /* first time an error happened */ 611 __u32 s_first_error_ino; /* inode involved in first error */ 612 __u64 s_first_error_block; /* block involved of first error */ 613 __u8 s_first_error_func[32]; /* function where the error happened */ 614 __u32 s_first_error_line; /* line number where error happened */ 615 __u32 s_last_error_time; /* most recent time of an error */ 616 __u32 s_last_error_ino; /* inode involved in last error */ 617 __u32 s_last_error_line; /* line number where error happened */ 618 __u64 s_last_error_block; /* block involved of last error */ 619 __u8 s_last_error_func[32]; /* function where the error happened */ 620#define EXT4_S_ERR_END ext4_offsetof(struct ext2_super_block, s_mount_opts) 621 __u8 s_mount_opts[64]; 622 __u32 s_usr_quota_inum; /* inode number of user quota file */ 623 __u32 s_grp_quota_inum; /* inode number of group quota file */ 624 __u32 s_overhead_blocks; /* overhead blocks/clusters in fs */ 625 __u32 s_reserved[109]; /* Padding to the end of the block */ 626}; 627 628#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 629 630/* 631 * Codes for operating systems 632 */ 633#define EXT2_OS_LINUX 0 634#define EXT2_OS_HURD 1 635#define EXT2_OBSO_OS_MASIX 2 636#define EXT2_OS_FREEBSD 3 637#define EXT2_OS_LITES 4 638 639/* 640 * Revision levels 641 */ 642#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 643#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 644 645#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 646#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 647 648#define EXT2_GOOD_OLD_INODE_SIZE 128 649 650/* 651 * Journal inode backup types 652 */ 653#define EXT3_JNL_BACKUP_BLOCKS 1 654 655/* 656 * Feature set definitions 657 */ 658 659#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 660 ( EXT2_SB(sb)->s_feature_compat & (mask) ) 661#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 662 ( EXT2_SB(sb)->s_feature_ro_compat & (mask) ) 663#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 664 ( EXT2_SB(sb)->s_feature_incompat & (mask) ) 665 666#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 667#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 668#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 669#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 670#define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010 671#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 672#define EXT2_FEATURE_COMPAT_LAZY_BG 0x0040 673#define EXT2_FEATURE_COMPAT_EXCLUDE_INODE 0x0080 674 675#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 676#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 677/* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 not used */ 678#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 679#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 680#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 681#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 682#define EXT4_FEATURE_RO_COMPAT_HAS_SNAPSHOT 0x0080 683#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 684#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 685 686#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 687#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 688#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 689#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 690#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 691#define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040 692#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 693#define EXT4_FEATURE_INCOMPAT_MMP 0x0100 694#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 695#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 696#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 697 698#define EXT2_FEATURE_COMPAT_SUPP 0 699#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE) 700#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 701 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 702 EXT4_FEATURE_RO_COMPAT_DIR_NLINK| \ 703 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 704 705/* 706 * Default values for user and/or group using reserved blocks 707 */ 708#define EXT2_DEF_RESUID 0 709#define EXT2_DEF_RESGID 0 710 711/* 712 * Default mount options 713 */ 714#define EXT2_DEFM_DEBUG 0x0001 715#define EXT2_DEFM_BSDGROUPS 0x0002 716#define EXT2_DEFM_XATTR_USER 0x0004 717#define EXT2_DEFM_ACL 0x0008 718#define EXT2_DEFM_UID16 0x0010 719#define EXT3_DEFM_JMODE 0x0060 720#define EXT3_DEFM_JMODE_DATA 0x0020 721#define EXT3_DEFM_JMODE_ORDERED 0x0040 722#define EXT3_DEFM_JMODE_WBACK 0x0060 723#define EXT4_DEFM_NOBARRIER 0x0100 724#define EXT4_DEFM_BLOCK_VALIDITY 0x0200 725#define EXT4_DEFM_DISCARD 0x0400 726#define EXT4_DEFM_NODELALLOC 0x0800 727 728/* 729 * Structure of a directory entry 730 */ 731#define EXT2_NAME_LEN 255 732 733struct ext2_dir_entry { 734 __u32 inode; /* Inode number */ 735 __u16 rec_len; /* Directory entry length */ 736 __u16 name_len; /* Name length */ 737 char name[EXT2_NAME_LEN]; /* File name */ 738}; 739 740/* 741 * The new version of the directory entry. Since EXT2 structures are 742 * stored in intel byte order, and the name_len field could never be 743 * bigger than 255 chars, it's safe to reclaim the extra byte for the 744 * file_type field. 745 */ 746struct ext2_dir_entry_2 { 747 __u32 inode; /* Inode number */ 748 __u16 rec_len; /* Directory entry length */ 749 __u8 name_len; /* Name length */ 750 __u8 file_type; 751 char name[EXT2_NAME_LEN]; /* File name */ 752}; 753 754/* 755 * Ext2 directory file types. Only the low 3 bits are used. The 756 * other bits are reserved for now. 757 */ 758#define EXT2_FT_UNKNOWN 0 759#define EXT2_FT_REG_FILE 1 760#define EXT2_FT_DIR 2 761#define EXT2_FT_CHRDEV 3 762#define EXT2_FT_BLKDEV 4 763#define EXT2_FT_FIFO 5 764#define EXT2_FT_SOCK 6 765#define EXT2_FT_SYMLINK 7 766 767#define EXT2_FT_MAX 8 768 769/* 770 * EXT2_DIR_PAD defines the directory entries boundaries 771 * 772 * NOTE: It must be a multiple of 4 773 */ 774#define EXT2_DIR_PAD 4 775#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 776#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 777 ~EXT2_DIR_ROUND) 778 779/* 780 * This structure will be used for multiple mount protection. It will be 781 * written into the block number saved in the s_mmp_block field in the 782 * superblock. 783 */ 784#define EXT2_MMP_MAGIC 0x004D4D50 /* ASCII for MMP */ 785#define EXT2_MMP_CLEAN 0xFF4D4D50 /* Value of mmp_seq for clean unmount */ 786#define EXT2_MMP_FSCK_ON 0xE24D4D50 /* Value of mmp_seq when being fscked */ 787 788struct mmp_struct { 789 __u32 mmp_magic; 790 __u32 mmp_seq; 791 __u64 mmp_time; 792 char mmp_nodename[64]; 793 char mmp_bdevname[32]; 794 __u16 mmp_interval; 795 __u16 mmp_pad1; 796 __u32 mmp_pad2; 797}; 798 799/* 800 * Interval in number of seconds to update the MMP sequence number. 801 */ 802#define EXT2_MMP_DEF_INTERVAL 5 803 804#endif /* _LINUX_EXT2_FS_H */ 805