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 <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 * Debug code 44 */ 45 #ifdef EXT2FS_DEBUG 46 # define ext2_debug(f, a...) { \ 47 printk ("EXT2-fs DEBUG (%s, %d): %s:", \ 48 __FILE__, __LINE__, __FUNCTION__); \ 49 printk (f, ## a); \ 50 } 51 #else 52 # define ext2_debug(f, a...) /**/ 53 #endif 54 55 /* 56 * Special inode numbers 57 */ 58 #define EXT2_BAD_INO 1 /* Bad blocks inode */ 59 #define EXT2_ROOT_INO 2 /* Root inode */ 60 #define EXT2_ACL_IDX_INO 3 /* ACL inode */ 61 #define EXT2_ACL_DATA_INO 4 /* ACL inode */ 62 #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ 63 #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ 64 65 /* First non-reserved inode for old ext2 filesystems */ 66 #define EXT2_GOOD_OLD_FIRST_INO 11 67 68 /* 69 * The second extended file system magic number 70 */ 71 #define EXT2_SUPER_MAGIC 0xEF53 72 73 /* 74 * Maximal count of links to a file 75 */ 76 #define EXT2_LINK_MAX 32000 77 78 /* 79 * Macro-instructions used to manage several block sizes 80 */ 81 #define EXT2_MIN_BLOCK_SIZE 1024 82 #define EXT2_MAX_BLOCK_SIZE 4096 83 #define EXT2_MIN_BLOCK_LOG_SIZE 10 84 #ifdef __KERNEL__ 85 # define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) 86 #else 87 # define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size) 88 #endif 89 #define EXT2_ACLE_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_acl_entry)) 90 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32)) 91 #ifdef __KERNEL__ 92 # define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 93 #else 94 # define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 95 #endif 96 #ifdef __KERNEL__ 97 #define EXT2_ADDR_PER_BLOCK_BITS(s) ((s)->u.ext2_sb.s_addr_per_block_bits) 98 #define EXT2_INODE_SIZE(s) ((s)->u.ext2_sb.s_inode_size) 99 #define EXT2_FIRST_INO(s) ((s)->u.ext2_sb.s_first_ino) 100 #else 101 #define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 102 EXT2_GOOD_OLD_INODE_SIZE : \ 103 (s)->s_inode_size) 104 #define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 105 EXT2_GOOD_OLD_FIRST_INO : \ 106 (s)->s_first_ino) 107 #endif 108 109 /* 110 * Macro-instructions used to manage fragments 111 */ 112 #define EXT2_MIN_FRAG_SIZE 1024 113 #define EXT2_MAX_FRAG_SIZE 4096 114 #define EXT2_MIN_FRAG_LOG_SIZE 10 115 #ifdef __KERNEL__ 116 # define EXT2_FRAG_SIZE(s) ((s)->u.ext2_sb.s_frag_size) 117 # define EXT2_FRAGS_PER_BLOCK(s) ((s)->u.ext2_sb.s_frags_per_block) 118 #else 119 # define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size) 120 # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s)) 121 #endif 122 123 /* 124 * ACL structures 125 */ 126 struct 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 }; 133 134 struct 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 */ 148 struct 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_pad; 157 __u32 bg_reserved[3]; 158 }; 159 160 /* 161 * Macro-instructions used to manage group descriptors 162 */ 163 #ifdef __KERNEL__ 164 # define EXT2_BLOCKS_PER_GROUP(s) ((s)->u.ext2_sb.s_blocks_per_group) 165 # define EXT2_DESC_PER_BLOCK(s) ((s)->u.ext2_sb.s_desc_per_block) 166 # define EXT2_INODES_PER_GROUP(s) ((s)->u.ext2_sb.s_inodes_per_group) 167 # define EXT2_DESC_PER_BLOCK_BITS(s) ((s)->u.ext2_sb.s_desc_per_block_bits) 168 #else 169 # define EXT2_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 170 # define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc)) 171 # define EXT2_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 172 #endif 173 174 /* 175 * Constants relative to the data blocks 176 */ 177 #define EXT2_NDIR_BLOCKS 12 178 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 179 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 180 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 181 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 182 183 /* 184 * Inode flags 185 */ 186 #define EXT2_SECRM_FL 0x00000001 /* Secure deletion */ 187 #define EXT2_UNRM_FL 0x00000002 /* Undelete */ 188 #define EXT2_COMPR_FL 0x00000004 /* Compress file */ 189 #define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */ 190 #define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */ 191 #define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */ 192 #define EXT2_NODUMP_FL 0x00000040 /* do not dump file */ 193 #define EXT2_NOATIME_FL 0x00000080 /* do not update atime */ 194 /* Reserved for compression usage... */ 195 #define EXT2_DIRTY_FL 0x00000100 196 #define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 197 #define EXT2_NOCOMP_FL 0x00000400 /* Don't compress */ 198 #define EXT2_ECOMPR_FL 0x00000800 /* Compression error */ 199 /* End compression flags --- maybe not all used */ 200 #define EXT2_BTREE_FL 0x00001000 /* btree format dir */ 201 #define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 202 203 #define EXT2_FL_USER_VISIBLE 0x00001FFF /* User visible flags */ 204 #define EXT2_FL_USER_MODIFIABLE 0x000000FF /* User modifiable flags */ 205 206 /* 207 * ioctl commands 208 */ 209 #define EXT2_IOC_GETFLAGS _IOR('f', 1, long) 210 #define EXT2_IOC_SETFLAGS _IOW('f', 2, long) 211 #define EXT2_IOC_GETVERSION _IOR('v', 1, long) 212 #define EXT2_IOC_SETVERSION _IOW('v', 2, long) 213 214 /* 215 * Structure of an inode on the disk 216 */ 217 struct ext2_inode { 218 __u16 i_mode; /* File mode */ 219 __u16 i_uid; /* Low 16 bits of Owner Uid */ 220 __u32 i_size; /* Size in bytes */ 221 __u32 i_atime; /* Access time */ 222 __u32 i_ctime; /* Creation time */ 223 __u32 i_mtime; /* Modification time */ 224 __u32 i_dtime; /* Deletion Time */ 225 __u16 i_gid; /* Low 16 bits of Group Id */ 226 __u16 i_links_count; /* Links count */ 227 __u32 i_blocks; /* Blocks count */ 228 __u32 i_flags; /* File flags */ 229 union { 230 struct { 231 __u32 l_i_reserved1; 232 } linux1; 233 struct { 234 __u32 h_i_translator; 235 } hurd1; 236 struct { 237 __u32 m_i_reserved1; 238 } masix1; 239 } osd1; /* OS dependent 1 */ 240 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 241 __u32 i_generation; /* File version (for NFS) */ 242 __u32 i_file_acl; /* File ACL */ 243 __u32 i_dir_acl; /* Directory ACL */ 244 __u32 i_faddr; /* Fragment address */ 245 union { 246 struct { 247 __u8 l_i_frag; /* Fragment number */ 248 __u8 l_i_fsize; /* Fragment size */ 249 __u16 i_pad1; 250 __u16 l_i_uid_high; /* these 2 fields */ 251 __u16 l_i_gid_high; /* were reserved2[0] */ 252 __u32 l_i_reserved2; 253 } linux2; 254 struct { 255 __u8 h_i_frag; /* Fragment number */ 256 __u8 h_i_fsize; /* Fragment size */ 257 __u16 h_i_mode_high; 258 __u16 h_i_uid_high; 259 __u16 h_i_gid_high; 260 __u32 h_i_author; 261 } hurd2; 262 struct { 263 __u8 m_i_frag; /* Fragment number */ 264 __u8 m_i_fsize; /* Fragment size */ 265 __u16 m_pad1; 266 __u32 m_i_reserved2[2]; 267 } masix2; 268 } osd2; /* OS dependent 2 */ 269 }; 270 271 #define i_size_high i_dir_acl 272 273 #if defined(__KERNEL__) || defined(__linux__) 274 #define i_reserved1 osd1.linux1.l_i_reserved1 275 #define i_frag osd2.linux2.l_i_frag 276 #define i_fsize osd2.linux2.l_i_fsize 277 #define i_uid_low i_uid 278 #define i_gid_low i_gid 279 #define i_uid_high osd2.linux2.l_i_uid_high 280 #define i_gid_high osd2.linux2.l_i_gid_high 281 #define i_reserved2 osd2.linux2.l_i_reserved2 282 #endif 283 284 #ifdef __hurd__ 285 #define i_translator osd1.hurd1.h_i_translator 286 #define i_frag osd2.hurd2.h_i_frag; 287 #define i_fsize osd2.hurd2.h_i_fsize; 288 #define i_uid_high osd2.hurd2.h_i_uid_high 289 #define i_gid_high osd2.hurd2.h_i_gid_high 290 #define i_author osd2.hurd2.h_i_author 291 #endif 292 293 #ifdef __masix__ 294 #define i_reserved1 osd1.masix1.m_i_reserved1 295 #define i_frag osd2.masix2.m_i_frag 296 #define i_fsize osd2.masix2.m_i_fsize 297 #define i_reserved2 osd2.masix2.m_i_reserved2 298 #endif 299 300 /* 301 * File system states 302 */ 303 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 304 #define EXT2_ERROR_FS 0x0002 /* Errors detected */ 305 306 /* 307 * Mount flags 308 */ 309 #define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */ 310 #define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */ 311 #define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */ 312 #define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ 313 #define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ 314 #define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ 315 #define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */ 316 #define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */ 317 318 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 319 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt 320 #define test_opt(sb, opt) ((sb)->u.ext2_sb.s_mount_opt & \ 321 EXT2_MOUNT_##opt) 322 /* 323 * Maximal mount counts between two filesystem checks 324 */ 325 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 326 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 327 328 /* 329 * Behaviour when detecting errors 330 */ 331 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 332 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 333 #define EXT2_ERRORS_PANIC 3 /* Panic */ 334 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 335 336 /* 337 * Structure of the super block 338 */ 339 struct ext2_super_block { 340 __u32 s_inodes_count; /* Inodes count */ 341 __u32 s_blocks_count; /* Blocks count */ 342 __u32 s_r_blocks_count; /* Reserved blocks count */ 343 __u32 s_free_blocks_count; /* Free blocks count */ 344 __u32 s_free_inodes_count; /* Free inodes count */ 345 __u32 s_first_data_block; /* First Data Block */ 346 __u32 s_log_block_size; /* Block size */ 347 __s32 s_log_frag_size; /* Fragment size */ 348 __u32 s_blocks_per_group; /* # Blocks per group */ 349 __u32 s_frags_per_group; /* # Fragments per group */ 350 __u32 s_inodes_per_group; /* # Inodes per group */ 351 __u32 s_mtime; /* Mount time */ 352 __u32 s_wtime; /* Write time */ 353 __u16 s_mnt_count; /* Mount count */ 354 __s16 s_max_mnt_count; /* Maximal mount count */ 355 __u16 s_magic; /* Magic signature */ 356 __u16 s_state; /* File system state */ 357 __u16 s_errors; /* Behaviour when detecting errors */ 358 __u16 s_minor_rev_level; /* minor revision level */ 359 __u32 s_lastcheck; /* time of last check */ 360 __u32 s_checkinterval; /* max. time between checks */ 361 __u32 s_creator_os; /* OS */ 362 __u32 s_rev_level; /* Revision level */ 363 __u16 s_def_resuid; /* Default uid for reserved blocks */ 364 __u16 s_def_resgid; /* Default gid for reserved blocks */ 365 /* 366 * These fields are for EXT2_DYNAMIC_REV superblocks only. 367 * 368 * Note: the difference between the compatible feature set and 369 * the incompatible feature set is that if there is a bit set 370 * in the incompatible feature set that the kernel doesn't 371 * know about, it should refuse to mount the filesystem. 372 * 373 * e2fsck's requirements are more strict; if it doesn't know 374 * about a feature in either the compatible or incompatible 375 * feature set, it must abort and not try to meddle with 376 * things it doesn't understand... 377 */ 378 __u32 s_first_ino; /* First non-reserved inode */ 379 __u16 s_inode_size; /* size of inode structure */ 380 __u16 s_block_group_nr; /* block group # of this superblock */ 381 __u32 s_feature_compat; /* compatible feature set */ 382 __u32 s_feature_incompat; /* incompatible feature set */ 383 __u32 s_feature_ro_compat; /* readonly-compatible feature set */ 384 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 385 char s_volume_name[16]; /* volume name */ 386 char s_last_mounted[64]; /* directory where last mounted */ 387 __u32 s_algorithm_usage_bitmap; /* For compression */ 388 /* 389 * Performance hints. Directory preallocation should only 390 * happen if the EXT2_COMPAT_PREALLOC flag is on. 391 */ 392 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 393 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 394 __u16 s_padding1; 395 /* 396 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set. 397 */ 398 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 399 __u32 s_journal_inum; /* inode number of journal file */ 400 __u32 s_journal_dev; /* device number of journal file */ 401 __u32 s_last_orphan; /* start of list of inodes to delete */ 402 __u32 s_hash_seed[4]; /* HTREE hash seed */ 403 __u8 s_def_hash_version; /* Default hash version to use */ 404 __u8 s_reserved_char_pad; 405 __u16 s_reserved_word_pad; 406 __u32 s_default_mount_opts; 407 __u32 s_first_meta_bg; /* First metablock block group */ 408 __u32 s_reserved[190]; /* Padding to the end of the block */ 409 }; 410 411 #ifdef __KERNEL__ 412 #define EXT2_SB(sb) (&((sb)->u.ext2_sb)) 413 #else 414 /* Assume that user mode programs are passing in an ext2fs superblock, not 415 * a kernel struct super_block. This will allow us to call the feature-test 416 * macros from user land. */ 417 #define EXT2_SB(sb) (sb) 418 #endif 419 420 /* 421 * Codes for operating systems 422 */ 423 #define EXT2_OS_LINUX 0 424 #define EXT2_OS_HURD 1 425 #define EXT2_OS_MASIX 2 426 #define EXT2_OS_FREEBSD 3 427 #define EXT2_OS_LITES 4 428 429 /* 430 * Revision levels 431 */ 432 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 433 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 434 435 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 436 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 437 438 #define EXT2_GOOD_OLD_INODE_SIZE 128 439 440 /* 441 * Feature set definitions 442 */ 443 444 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 445 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) 446 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 447 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) 448 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 449 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) 450 #define EXT2_SET_COMPAT_FEATURE(sb,mask) \ 451 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 452 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \ 453 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 454 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \ 455 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 456 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \ 457 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 458 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 459 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 460 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 461 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 462 463 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 464 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 465 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 466 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 467 #define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010 468 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 469 #define EXT2_FEATURE_COMPAT_ANY 0xffffffff 470 471 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 472 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 473 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 474 #define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff 475 476 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 477 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 478 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 479 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 480 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 481 #define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff 482 483 #define EXT2_FEATURE_COMPAT_SUPP 0 484 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ 485 EXT2_FEATURE_INCOMPAT_META_BG) 486 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 487 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 488 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 489 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP 490 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP 491 492 /* 493 * Default mount options 494 */ 495 #define EXT2_DEFM_DEBUG 0x0001 496 #define EXT2_DEFM_BSDGROUPS 0x0002 497 #define EXT2_DEFM_XATTR_USER 0x0004 498 #define EXT2_DEFM_ACL 0x0008 499 #define EXT2_DEFM_UID16 0x0010 500 /* Not used by ext2, but reserved for use by ext3 */ 501 #define EXT3_DEFM_JMODE 0x0060 502 #define EXT3_DEFM_JMODE_DATA 0x0020 503 #define EXT3_DEFM_JMODE_ORDERED 0x0040 504 #define EXT3_DEFM_JMODE_WBACK 0x0060 505 506 #define EXT2_DEF_RESUID 0 507 #define EXT2_DEF_RESGID 0 508 509 /* 510 * Structure of a directory entry 511 */ 512 #define EXT2_NAME_LEN 255 513 514 struct ext2_dir_entry { 515 __u32 inode; /* Inode number */ 516 __u16 rec_len; /* Directory entry length */ 517 __u16 name_len; /* Name length */ 518 char name[EXT2_NAME_LEN]; /* File name */ 519 }; 520 521 /* 522 * The new version of the directory entry. Since EXT2 structures are 523 * stored in intel byte order, and the name_len field could never be 524 * bigger than 255 chars, it's safe to reclaim the extra byte for the 525 * file_type field. 526 */ 527 struct ext2_dir_entry_2 { 528 __u32 inode; /* Inode number */ 529 __u16 rec_len; /* Directory entry length */ 530 __u8 name_len; /* Name length */ 531 __u8 file_type; 532 char name[EXT2_NAME_LEN]; /* File name */ 533 }; 534 535 /* 536 * Ext2 directory file types. Only the low 3 bits are used. The 537 * other bits are reserved for now. 538 */ 539 enum { 540 EXT2_FT_UNKNOWN, 541 EXT2_FT_REG_FILE, 542 EXT2_FT_DIR, 543 EXT2_FT_CHRDEV, 544 EXT2_FT_BLKDEV, 545 EXT2_FT_FIFO, 546 EXT2_FT_SOCK, 547 EXT2_FT_SYMLINK, 548 EXT2_FT_MAX 549 }; 550 551 /* 552 * EXT2_DIR_PAD defines the directory entries boundaries 553 * 554 * NOTE: It must be a multiple of 4 555 */ 556 #define EXT2_DIR_PAD 4 557 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 558 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 559 ~EXT2_DIR_ROUND) 560 561 #ifdef __KERNEL__ 562 /* 563 * Function prototypes 564 */ 565 566 /* 567 * Ok, these declarations are also in <linux/kernel.h> but none of the 568 * ext2 source programs needs to include it so they are duplicated here. 569 */ 570 # define NORET_TYPE /**/ 571 # define ATTRIB_NORET __attribute__((noreturn)) 572 # define NORET_AND noreturn, 573 574 /* balloc.c */ 575 extern int ext2_bg_has_super(struct super_block *sb, int group); 576 extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group); 577 extern int ext2_new_block (struct inode *, unsigned long, 578 __u32 *, __u32 *, int *); 579 extern void ext2_free_blocks (struct inode *, unsigned long, 580 unsigned long); 581 extern unsigned long ext2_count_free_blocks (struct super_block *); 582 extern void ext2_check_blocks_bitmap (struct super_block *); 583 extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb, 584 unsigned int block_group, 585 struct buffer_head ** bh); 586 587 /* dir.c */ 588 extern int ext2_add_link (struct dentry *, struct inode *); 589 extern ino_t ext2_inode_by_name(struct inode *, struct dentry *); 590 extern int ext2_make_empty(struct inode *, struct inode *); 591 extern struct ext2_dir_entry_2 * ext2_find_entry (struct inode *,struct dentry *, struct page **); 592 extern int ext2_delete_entry (struct ext2_dir_entry_2 *, struct page *); 593 extern int ext2_empty_dir (struct inode *); 594 extern struct ext2_dir_entry_2 * ext2_dotdot (struct inode *, struct page **); 595 extern void ext2_set_link(struct inode *, struct ext2_dir_entry_2 *, struct page *, struct inode *); 596 597 /* fsync.c */ 598 extern int ext2_sync_file (struct file *, struct dentry *, int); 599 extern int ext2_fsync_inode (struct inode *, int); 600 601 /* ialloc.c */ 602 extern struct inode * ext2_new_inode (const struct inode *, int); 603 extern void ext2_free_inode (struct inode *); 604 extern unsigned long ext2_count_free_inodes (struct super_block *); 605 extern void ext2_check_inodes_bitmap (struct super_block *); 606 extern unsigned long ext2_count_free (struct buffer_head *, unsigned); 607 608 /* inode.c */ 609 extern void ext2_read_inode (struct inode *); 610 extern void ext2_write_inode (struct inode *, int); 611 extern void ext2_put_inode (struct inode *); 612 extern void ext2_delete_inode (struct inode *); 613 extern int ext2_sync_inode (struct inode *); 614 extern void ext2_discard_prealloc (struct inode *); 615 extern void ext2_truncate (struct inode *); 616 extern void ext2_set_inode_flags(struct inode *inode); 617 618 /* ioctl.c */ 619 extern int ext2_ioctl (struct inode *, struct file *, unsigned int, 620 unsigned long); 621 622 /* super.c */ 623 extern void ext2_error (struct super_block *, const char *, const char *, ...) 624 __attribute__ ((format (printf, 3, 4))); 625 extern NORET_TYPE void ext2_panic (struct super_block *, const char *, 626 const char *, ...) 627 __attribute__ ((NORET_AND format (printf, 3, 4))); 628 extern void ext2_warning (struct super_block *, const char *, const char *, ...) 629 __attribute__ ((format (printf, 3, 4))); 630 extern void ext2_update_dynamic_rev (struct super_block *sb); 631 extern void ext2_put_super (struct super_block *); 632 extern void ext2_write_super (struct super_block *); 633 extern int ext2_remount (struct super_block *, int *, char *); 634 extern struct super_block * ext2_read_super (struct super_block *,void *,int); 635 extern int ext2_statfs (struct super_block *, struct statfs *); 636 637 /* 638 * Inodes and files operations 639 */ 640 641 /* dir.c */ 642 extern struct file_operations ext2_dir_operations; 643 644 /* file.c */ 645 extern struct inode_operations ext2_file_inode_operations; 646 extern struct file_operations ext2_file_operations; 647 648 /* inode.c */ 649 extern struct address_space_operations ext2_aops; 650 651 /* namei.c */ 652 extern struct inode_operations ext2_dir_inode_operations; 653 654 /* symlink.c */ 655 extern struct inode_operations ext2_fast_symlink_inode_operations; 656 657 #endif /* __KERNEL__ */ 658 659 #endif /* _LINUX_EXT2_FS_H */ 660