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_IMAGIC_FL 0x00002000 /* AFS directory */ 202 #define EXT2_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 203 #define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 204 #define EXT2_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 205 #define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 206 #define EXT2_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 207 #define EXT2_EXTENTS_FL 0x00080000 /* Inode uses extents */ 208 #define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 209 210 #define EXT2_FL_USER_VISIBLE 0x00001FFF /* User visible flags */ 211 #define EXT2_FL_USER_MODIFIABLE 0x000000FF /* User modifiable flags */ 212 213 /* 214 * ioctl commands 215 */ 216 #define EXT2_IOC_GETFLAGS _IOR('f', 1, long) 217 #define EXT2_IOC_SETFLAGS _IOW('f', 2, long) 218 #define EXT2_IOC_GETVERSION _IOR('v', 1, long) 219 #define EXT2_IOC_SETVERSION _IOW('v', 2, long) 220 221 /* 222 * Structure of an inode on the disk 223 */ 224 struct ext2_inode { 225 __u16 i_mode; /* File mode */ 226 __u16 i_uid; /* Low 16 bits of Owner Uid */ 227 __u32 i_size; /* Size in bytes */ 228 __u32 i_atime; /* Access time */ 229 __u32 i_ctime; /* Creation time */ 230 __u32 i_mtime; /* Modification time */ 231 __u32 i_dtime; /* Deletion Time */ 232 __u16 i_gid; /* Low 16 bits of Group Id */ 233 __u16 i_links_count; /* Links count */ 234 __u32 i_blocks; /* Blocks count */ 235 __u32 i_flags; /* File flags */ 236 union { 237 struct { 238 __u32 l_i_reserved1; 239 } linux1; 240 struct { 241 __u32 h_i_translator; 242 } hurd1; 243 struct { 244 __u32 m_i_reserved1; 245 } masix1; 246 } osd1; /* OS dependent 1 */ 247 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 248 __u32 i_generation; /* File version (for NFS) */ 249 __u32 i_file_acl; /* File ACL */ 250 __u32 i_dir_acl; /* Directory ACL */ 251 __u32 i_faddr; /* Fragment address */ 252 union { 253 struct { 254 __u8 l_i_frag; /* Fragment number */ 255 __u8 l_i_fsize; /* Fragment size */ 256 __u16 i_pad1; 257 __u16 l_i_uid_high; /* these 2 fields */ 258 __u16 l_i_gid_high; /* were reserved2[0] */ 259 __u32 l_i_reserved2; 260 } linux2; 261 struct { 262 __u8 h_i_frag; /* Fragment number */ 263 __u8 h_i_fsize; /* Fragment size */ 264 __u16 h_i_mode_high; 265 __u16 h_i_uid_high; 266 __u16 h_i_gid_high; 267 __u32 h_i_author; 268 } hurd2; 269 struct { 270 __u8 m_i_frag; /* Fragment number */ 271 __u8 m_i_fsize; /* Fragment size */ 272 __u16 m_pad1; 273 __u32 m_i_reserved2[2]; 274 } masix2; 275 } osd2; /* OS dependent 2 */ 276 __le16 i_extra_isize; 277 __le16 i_pad1; 278 }; 279 280 #if defined(__KERNEL__) || defined(__linux__) 281 #define i_reserved1 osd1.linux1.l_i_reserved1 282 #define i_frag osd2.linux2.l_i_frag 283 #define i_fsize osd2.linux2.l_i_fsize 284 #define i_uid_low i_uid 285 #define i_gid_low i_gid 286 #define i_uid_high osd2.linux2.l_i_uid_high 287 #define i_gid_high osd2.linux2.l_i_gid_high 288 #define i_reserved2 osd2.linux2.l_i_reserved2 289 #endif 290 291 #ifdef __hurd__ 292 #define i_translator osd1.hurd1.h_i_translator 293 #define i_frag osd2.hurd2.h_i_frag; 294 #define i_fsize osd2.hurd2.h_i_fsize; 295 #define i_uid_high osd2.hurd2.h_i_uid_high 296 #define i_gid_high osd2.hurd2.h_i_gid_high 297 #define i_author osd2.hurd2.h_i_author 298 #endif 299 300 #ifdef __masix__ 301 #define i_reserved1 osd1.masix1.m_i_reserved1 302 #define i_frag osd2.masix2.m_i_frag 303 #define i_fsize osd2.masix2.m_i_fsize 304 #define i_reserved2 osd2.masix2.m_i_reserved2 305 #endif 306 307 /* 308 * File system states 309 */ 310 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 311 #define EXT2_ERROR_FS 0x0002 /* Errors detected */ 312 313 /* 314 * Mount flags 315 */ 316 #define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */ 317 #define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */ 318 #define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */ 319 #define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ 320 #define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ 321 #define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ 322 #define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */ 323 #define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */ 324 325 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 326 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt 327 #define test_opt(sb, opt) ((sb)->u.ext2_sb.s_mount_opt & \ 328 EXT2_MOUNT_##opt) 329 /* 330 * Maximal mount counts between two filesystem checks 331 */ 332 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 333 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 334 335 /* 336 * Behaviour when detecting errors 337 */ 338 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 339 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 340 #define EXT2_ERRORS_PANIC 3 /* Panic */ 341 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 342 343 /* 344 * Structure of the super block 345 */ 346 struct ext2_super_block { 347 __u32 s_inodes_count; /* Inodes count */ 348 __u32 s_blocks_count; /* Blocks count */ 349 __u32 s_r_blocks_count; /* Reserved blocks count */ 350 __u32 s_free_blocks_count; /* Free blocks count */ 351 __u32 s_free_inodes_count; /* Free inodes count */ 352 __u32 s_first_data_block; /* First Data Block */ 353 __u32 s_log_block_size; /* Block size */ 354 __s32 s_log_frag_size; /* Fragment size */ 355 __u32 s_blocks_per_group; /* # Blocks per group */ 356 __u32 s_frags_per_group; /* # Fragments per group */ 357 __u32 s_inodes_per_group; /* # Inodes per group */ 358 __u32 s_mtime; /* Mount time */ 359 __u32 s_wtime; /* Write time */ 360 __u16 s_mnt_count; /* Mount count */ 361 __s16 s_max_mnt_count; /* Maximal mount count */ 362 __u16 s_magic; /* Magic signature */ 363 __u16 s_state; /* File system state */ 364 __u16 s_errors; /* Behaviour when detecting errors */ 365 __u16 s_minor_rev_level; /* minor revision level */ 366 __u32 s_lastcheck; /* time of last check */ 367 __u32 s_checkinterval; /* max. time between checks */ 368 __u32 s_creator_os; /* OS */ 369 __u32 s_rev_level; /* Revision level */ 370 __u16 s_def_resuid; /* Default uid for reserved blocks */ 371 __u16 s_def_resgid; /* Default gid for reserved blocks */ 372 /* 373 * These fields are for EXT2_DYNAMIC_REV superblocks only. 374 * 375 * Note: the difference between the compatible feature set and 376 * the incompatible feature set is that if there is a bit set 377 * in the incompatible feature set that the kernel doesn't 378 * know about, it should refuse to mount the filesystem. 379 * 380 * e2fsck's requirements are more strict; if it doesn't know 381 * about a feature in either the compatible or incompatible 382 * feature set, it must abort and not try to meddle with 383 * things it doesn't understand... 384 */ 385 __u32 s_first_ino; /* First non-reserved inode */ 386 __u16 s_inode_size; /* size of inode structure */ 387 __u16 s_block_group_nr; /* block group # of this superblock */ 388 __u32 s_feature_compat; /* compatible feature set */ 389 __u32 s_feature_incompat; /* incompatible feature set */ 390 __u32 s_feature_ro_compat; /* readonly-compatible feature set */ 391 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 392 char s_volume_name[16]; /* volume name */ 393 char s_last_mounted[64]; /* directory where last mounted */ 394 __u32 s_algorithm_usage_bitmap; /* For compression */ 395 /* 396 * Performance hints. Directory preallocation should only 397 * happen if the EXT2_COMPAT_PREALLOC flag is on. 398 */ 399 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 400 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 401 __u16 s_padding1; 402 __u32 s_reserved[204]; /* Padding to the end of the block */ 403 }; 404 405 #ifdef __KERNEL__ 406 #define EXT2_SB(sb) (&((sb)->u.ext2_sb)) 407 #else 408 /* Assume that user mode programs are passing in an ext2fs superblock, not 409 * a kernel struct super_block. This will allow us to call the feature-test 410 * macros from user land. */ 411 #define EXT2_SB(sb) (sb) 412 #endif 413 414 /* 415 * Codes for operating systems 416 */ 417 #define EXT2_OS_LINUX 0 418 #define EXT2_OS_HURD 1 419 #define EXT2_OS_MASIX 2 420 #define EXT2_OS_FREEBSD 3 421 #define EXT2_OS_LITES 4 422 423 /* 424 * Revision levels 425 */ 426 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 427 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 428 429 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 430 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 431 432 #define EXT2_GOOD_OLD_INODE_SIZE 128 433 434 /* 435 * Feature set definitions 436 */ 437 438 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 439 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) 440 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 441 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) 442 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 443 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) 444 #define EXT2_SET_COMPAT_FEATURE(sb,mask) \ 445 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 446 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \ 447 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 448 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \ 449 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 450 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \ 451 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 452 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 453 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 454 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 455 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 456 457 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 458 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 459 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 460 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 461 #define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010 462 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 463 #define EXT2_FEATURE_COMPAT_ANY 0xffffffff 464 465 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 466 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 467 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 468 #define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff 469 470 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 471 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 472 473 #define EXT2_FEATURE_COMPAT_SUPP 0 474 #define EXT2_FEATURE_INCOMPAT_SUPP EXT2_FEATURE_INCOMPAT_FILETYPE 475 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 476 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 477 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 478 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP 479 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP 480 481 /* 482 * Default values for user and/or group using reserved blocks 483 */ 484 #define EXT2_DEF_RESUID 0 485 #define EXT2_DEF_RESGID 0 486 487 /* 488 * Structure of a directory entry 489 */ 490 #define EXT2_NAME_LEN 255 491 492 struct ext2_dir_entry { 493 __u32 inode; /* Inode number */ 494 __u16 rec_len; /* Directory entry length */ 495 __u16 name_len; /* Name length */ 496 char name[EXT2_NAME_LEN]; /* File name */ 497 }; 498 499 /* 500 * The new version of the directory entry. Since EXT2 structures are 501 * stored in intel byte order, and the name_len field could never be 502 * bigger than 255 chars, it's safe to reclaim the extra byte for the 503 * file_type field. 504 */ 505 struct ext2_dir_entry_2 { 506 __u32 inode; /* Inode number */ 507 __u16 rec_len; /* Directory entry length */ 508 __u8 name_len; /* Name length */ 509 __u8 file_type; 510 char name[EXT2_NAME_LEN]; /* File name */ 511 }; 512 513 /* 514 * Ext2 directory file types. Only the low 3 bits are used. The 515 * other bits are reserved for now. 516 */ 517 enum { 518 EXT2_FT_UNKNOWN, 519 EXT2_FT_REG_FILE, 520 EXT2_FT_DIR, 521 EXT2_FT_CHRDEV, 522 EXT2_FT_BLKDEV, 523 EXT2_FT_FIFO, 524 EXT2_FT_SOCK, 525 EXT2_FT_SYMLINK, 526 EXT2_FT_MAX 527 }; 528 529 /* 530 * EXT2_DIR_PAD defines the directory entries boundaries 531 * 532 * NOTE: It must be a multiple of 4 533 */ 534 #define EXT2_DIR_PAD 4 535 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 536 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 537 ~EXT2_DIR_ROUND) 538 539 #ifdef __KERNEL__ 540 /* 541 * Function prototypes 542 */ 543 544 /* 545 * Ok, these declarations are also in <linux/kernel.h> but none of the 546 * ext2 source programs needs to include it so they are duplicated here. 547 */ 548 # define NORET_TYPE /**/ 549 # define ATTRIB_NORET __attribute__((noreturn)) 550 # define NORET_AND noreturn, 551 552 /* balloc.c */ 553 extern int ext2_bg_has_super(struct super_block *sb, int group); 554 extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group); 555 extern int ext2_new_block (struct inode *, unsigned long, 556 __u32 *, __u32 *, int *); 557 extern void ext2_free_blocks (struct inode *, unsigned long, 558 unsigned long); 559 extern unsigned long ext2_count_free_blocks (struct super_block *); 560 extern void ext2_check_blocks_bitmap (struct super_block *); 561 extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb, 562 unsigned int block_group, 563 struct buffer_head ** bh); 564 565 /* dir.c */ 566 extern int ext2_add_link (struct dentry *, struct inode *); 567 extern ino_t ext2_inode_by_name(struct inode *, struct dentry *); 568 extern int ext2_make_empty(struct inode *, struct inode *); 569 extern struct ext2_dir_entry_2 * ext2_find_entry (struct inode *,struct dentry *, struct page **); 570 extern int ext2_delete_entry (struct ext2_dir_entry_2 *, struct page *); 571 extern int ext2_empty_dir (struct inode *); 572 extern struct ext2_dir_entry_2 * ext2_dotdot (struct inode *, struct page **); 573 extern void ext2_set_link(struct inode *, struct ext2_dir_entry_2 *, struct page *, struct inode *); 574 575 /* fsync.c */ 576 extern int ext2_sync_file (struct file *, struct dentry *, int); 577 extern int ext2_fsync_inode (struct inode *, int); 578 579 /* ialloc.c */ 580 extern struct inode * ext2_new_inode (const struct inode *, int); 581 extern void ext2_free_inode (struct inode *); 582 extern unsigned long ext2_count_free_inodes (struct super_block *); 583 extern void ext2_check_inodes_bitmap (struct super_block *); 584 extern unsigned long ext2_count_free (struct buffer_head *, unsigned); 585 586 /* inode.c */ 587 extern void ext2_read_inode (struct inode *); 588 extern void ext2_write_inode (struct inode *, int); 589 extern void ext2_put_inode (struct inode *); 590 extern void ext2_delete_inode (struct inode *); 591 extern int ext2_sync_inode (struct inode *); 592 extern void ext2_discard_prealloc (struct inode *); 593 extern void ext2_truncate (struct inode *); 594 595 /* ioctl.c */ 596 extern int ext2_ioctl (struct inode *, struct file *, unsigned int, 597 unsigned long); 598 599 /* super.c */ 600 extern void ext2_error (struct super_block *, const char *, const char *, ...) 601 __attribute__ ((format (printf, 3, 4))); 602 extern NORET_TYPE void ext2_panic (struct super_block *, const char *, 603 const char *, ...) 604 __attribute__ ((NORET_AND format (printf, 3, 4))); 605 extern void ext2_warning (struct super_block *, const char *, const char *, ...) 606 __attribute__ ((format (printf, 3, 4))); 607 extern void ext2_update_dynamic_rev (struct super_block *sb); 608 extern void ext2_put_super (struct super_block *); 609 extern void ext2_write_super (struct super_block *); 610 extern int ext2_remount (struct super_block *, int *, char *); 611 extern struct super_block * ext2_read_super (struct super_block *,void *,int); 612 #ifndef __REACTOS__ 613 extern int ext2_statfs (struct super_block *, struct statfs *); 614 #endif 615 616 /* 617 * Inodes and files operations 618 */ 619 620 /* dir.c */ 621 extern struct file_operations ext2_dir_operations; 622 623 /* file.c */ 624 extern struct inode_operations ext2_file_inode_operations; 625 extern struct file_operations ext2_file_operations; 626 627 /* inode.c */ 628 extern struct address_space_operations ext2_aops; 629 630 /* namei.c */ 631 extern struct inode_operations ext2_dir_inode_operations; 632 633 /* symlink.c */ 634 extern struct inode_operations ext2_fast_symlink_inode_operations; 635 636 #endif /* __KERNEL__ */ 637 638 #endif /* _LINUX_EXT2_FS_H */ 639