ext2_fs.h revision df614db6ef79c767745b8154c26d69398b571605
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 inodes numbers 44 */ 45#define EXT2_BAD_INO 1 /* Bad blocks inode */ 46#define EXT2_ROOT_INO 2 /* Root inode */ 47#define EXT2_ACL_IDX_INO 3 /* ACL inode */ 48#define EXT2_ACL_DATA_INO 4 /* ACL 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 54/* First non-reserved inode for old ext2 filesystems */ 55#define EXT2_GOOD_OLD_FIRST_INO 11 56 57/* 58 * The second extended file system magic number 59 */ 60#define EXT2_SUPER_MAGIC 0xEF53 61 62/* 63 * Maximal count of links to a file 64 */ 65#define EXT2_LINK_MAX 32000 66 67/* 68 * Macro-instructions used to manage several block sizes 69 */ 70#define EXT2_MIN_BLOCK_SIZE 1024 71#define EXT2_MAX_BLOCK_SIZE 4096 72#define EXT2_MIN_BLOCK_LOG_SIZE 10 73#ifdef __KERNEL__ 74# define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) 75#else 76# define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size) 77#endif 78#define EXT2_ACLE_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_acl_entry)) 79#define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32)) 80#ifdef __KERNEL__ 81# define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 82#else 83# define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 84#endif 85#ifdef __KERNEL__ 86#define EXT2_ADDR_PER_BLOCK_BITS(s) ((s)->u.ext2_sb.s_addr_per_block_bits) 87#define EXT2_INODE_SIZE(s) ((s)->u.ext2_sb.s_inode_size) 88#define EXT2_FIRST_INO(s) ((s)->u.ext2_sb.s_first_ino) 89#else 90#define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 91 EXT2_GOOD_OLD_INODE_SIZE : \ 92 (s)->s_inode_size) 93#define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 94 EXT2_GOOD_OLD_FIRST_INO : \ 95 (s)->s_first_ino) 96#endif 97 98/* 99 * Macro-instructions used to manage fragments 100 */ 101#define EXT2_MIN_FRAG_SIZE 1024 102#define EXT2_MAX_FRAG_SIZE 4096 103#define EXT2_MIN_FRAG_LOG_SIZE 10 104#ifdef __KERNEL__ 105# define EXT2_FRAG_SIZE(s) ((s)->u.ext2_sb.s_frag_size) 106# define EXT2_FRAGS_PER_BLOCK(s) ((s)->u.ext2_sb.s_frags_per_block) 107#else 108# define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size) 109# define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s)) 110#endif 111 112/* 113 * ACL structures 114 */ 115struct ext2_acl_header /* Header of Access Control Lists */ 116{ 117 __u32 aclh_size; 118 __u32 aclh_file_count; 119 __u32 aclh_acle_count; 120 __u32 aclh_first_acle; 121}; 122 123struct ext2_acl_entry /* Access Control List Entry */ 124{ 125 __u32 acle_size; 126 __u16 acle_perms; /* Access permissions */ 127 __u16 acle_type; /* Type of entry */ 128 __u16 acle_tag; /* User or group identity */ 129 __u16 acle_pad1; 130 __u32 acle_next; /* Pointer on next entry for the */ 131 /* same inode or on next free entry */ 132}; 133 134/* 135 * Structure of a blocks group descriptor 136 */ 137struct ext2_group_desc 138{ 139 __u32 bg_block_bitmap; /* Blocks bitmap block */ 140 __u32 bg_inode_bitmap; /* Inodes bitmap block */ 141 __u32 bg_inode_table; /* Inodes table block */ 142 __u16 bg_free_blocks_count; /* Free blocks count */ 143 __u16 bg_free_inodes_count; /* Free inodes count */ 144 __u16 bg_used_dirs_count; /* Directories count */ 145 __u16 bg_pad; 146 __u32 bg_reserved[3]; 147}; 148 149/* 150 * Data structures used by the directory indexing feature 151 * 152 * Note: all of the multibyte integer fields are little endian. 153 */ 154 155/* 156 * Note: dx_root_info is laid out so that if it should somehow get 157 * overlaid by a dirent the two low bits of the hash version will be 158 * zero. Therefore, the hash version mod 4 should never be 0. 159 * Sincerely, the paranoia department. 160 */ 161struct ext2_dx_root_info { 162 __u32 reserved_zero; 163 __u8 hash_version; /* 0 now, 1 at release */ 164 __u8 info_length; /* 8 */ 165 __u8 indirect_levels; 166 __u8 unused_flags; 167}; 168 169struct ext2_dx_entry { 170 __u32 hash; 171 __u32 block; 172}; 173 174struct ext2_dx_countlimit { 175 __u16 limit; 176 __u16 count; 177}; 178 179 180/* 181 * Macro-instructions used to manage group descriptors 182 */ 183#ifdef __KERNEL__ 184# define EXT2_BLOCKS_PER_GROUP(s) ((s)->u.ext2_sb.s_blocks_per_group) 185# define EXT2_DESC_PER_BLOCK(s) ((s)->u.ext2_sb.s_desc_per_block) 186# define EXT2_INODES_PER_GROUP(s) ((s)->u.ext2_sb.s_inodes_per_group) 187# define EXT2_DESC_PER_BLOCK_BITS(s) ((s)->u.ext2_sb.s_desc_per_block_bits) 188#else 189# define EXT2_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 190# define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc)) 191# define EXT2_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 192#endif 193 194/* 195 * Constants relative to the data blocks 196 */ 197#define EXT2_NDIR_BLOCKS 12 198#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 199#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 200#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 201#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 202 203/* 204 * Inode flags 205 */ 206#define EXT2_SECRM_FL 0x00000001 /* Secure deletion */ 207#define EXT2_UNRM_FL 0x00000002 /* Undelete */ 208#define EXT2_COMPR_FL 0x00000004 /* Compress file */ 209#define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */ 210#define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */ 211#define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */ 212#define EXT2_NODUMP_FL 0x00000040 /* do not dump file */ 213#define EXT2_NOATIME_FL 0x00000080 /* do not update atime */ 214/* Reserved for compression usage... */ 215#define EXT2_DIRTY_FL 0x00000100 216#define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 217#define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */ 218#define EXT2_ECOMPR_FL 0x00000800 /* Compression error */ 219/* End compression flags --- maybe not all used */ 220#define EXT2_BTREE_FL 0x00001000 /* btree format dir */ 221#define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */ 222#define EXT2_IMAGIC_FL 0x00002000 223#define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 224#define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 225#define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 226 227#define EXT2_FL_USER_VISIBLE 0x0000DFFF /* User visible flags */ 228#define EXT2_FL_USER_MODIFIABLE 0x000080FF /* User modifiable flags */ 229 230/* 231 * ioctl commands 232 */ 233#define EXT2_IOC_GETFLAGS _IOR('f', 1, long) 234#define EXT2_IOC_SETFLAGS _IOW('f', 2, long) 235#define EXT2_IOC_GETVERSION _IOR('v', 1, long) 236#define EXT2_IOC_SETVERSION _IOW('v', 2, long) 237 238/* 239 * Structure of an inode on the disk 240 */ 241struct ext2_inode { 242 __u16 i_mode; /* File mode */ 243 __u16 i_uid; /* Low 16 bits of Owner Uid */ 244 __u32 i_size; /* Size in bytes */ 245 __u32 i_atime; /* Access time */ 246 __u32 i_ctime; /* Creation time */ 247 __u32 i_mtime; /* Modification time */ 248 __u32 i_dtime; /* Deletion Time */ 249 __u16 i_gid; /* Low 16 bits of Group Id */ 250 __u16 i_links_count; /* Links count */ 251 __u32 i_blocks; /* Blocks count */ 252 __u32 i_flags; /* File flags */ 253 union { 254 struct { 255 __u32 l_i_reserved1; 256 } linux1; 257 struct { 258 __u32 h_i_translator; 259 } hurd1; 260 struct { 261 __u32 m_i_reserved1; 262 } masix1; 263 } osd1; /* OS dependent 1 */ 264 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 265 __u32 i_generation; /* File version (for NFS) */ 266 __u32 i_file_acl; /* File ACL */ 267 __u32 i_dir_acl; /* Directory ACL */ 268 __u32 i_faddr; /* Fragment address */ 269 union { 270 struct { 271 __u8 l_i_frag; /* Fragment number */ 272 __u8 l_i_fsize; /* Fragment size */ 273 __u16 i_pad1; 274 __u16 l_i_uid_high; /* these 2 fields */ 275 __u16 l_i_gid_high; /* were reserved2[0] */ 276 __u32 l_i_reserved2; 277 } linux2; 278 struct { 279 __u8 h_i_frag; /* Fragment number */ 280 __u8 h_i_fsize; /* Fragment size */ 281 __u16 h_i_mode_high; 282 __u16 h_i_uid_high; 283 __u16 h_i_gid_high; 284 __u32 h_i_author; 285 } hurd2; 286 struct { 287 __u8 m_i_frag; /* Fragment number */ 288 __u8 m_i_fsize; /* Fragment size */ 289 __u16 m_pad1; 290 __u32 m_i_reserved2[2]; 291 } masix2; 292 } osd2; /* OS dependent 2 */ 293}; 294 295#define i_size_high i_dir_acl 296 297#if defined(__KERNEL__) || defined(__linux__) 298#define i_reserved1 osd1.linux1.l_i_reserved1 299#define i_frag osd2.linux2.l_i_frag 300#define i_fsize osd2.linux2.l_i_fsize 301#define i_uid_low i_uid 302#define i_gid_low i_gid 303#define i_uid_high osd2.linux2.l_i_uid_high 304#define i_gid_high osd2.linux2.l_i_gid_high 305#define i_reserved2 osd2.linux2.l_i_reserved2 306 307#elif defined(__GNU__) 308 309#define i_translator osd1.hurd1.h_i_translator 310#define i_frag osd2.hurd2.h_i_frag; 311#define i_fsize osd2.hurd2.h_i_fsize; 312#define i_uid_high osd2.hurd2.h_i_uid_high 313#define i_gid_high osd2.hurd2.h_i_gid_high 314#define i_author osd2.hurd2.h_i_author 315 316#elif defined(__masix__) 317 318#define i_reserved1 osd1.masix1.m_i_reserved1 319#define i_frag osd2.masix2.m_i_frag 320#define i_fsize osd2.masix2.m_i_fsize 321#define i_reserved2 osd2.masix2.m_i_reserved2 322 323#endif /* defined(__KERNEL) || defined(__linux__) */ 324 325/* 326 * File system states 327 */ 328#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 329#define EXT2_ERROR_FS 0x0002 /* Errors detected */ 330 331/* 332 * Mount flags 333 */ 334#define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */ 335#define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */ 336#define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */ 337#define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ 338#define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ 339#define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ 340#define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */ 341#define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */ 342 343#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 344#define set_opt(o, opt) o |= EXT2_MOUNT_##opt 345#define test_opt(sb, opt) ((sb)->u.ext2_sb.s_mount_opt & \ 346 EXT2_MOUNT_##opt) 347/* 348 * Maximal mount counts between two filesystem checks 349 */ 350#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 351#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 352 353/* 354 * Behaviour when detecting errors 355 */ 356#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 357#define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 358#define EXT2_ERRORS_PANIC 3 /* Panic */ 359#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 360 361/* 362 * Structure of the super block 363 */ 364struct ext2_super_block { 365 __u32 s_inodes_count; /* Inodes count */ 366 __u32 s_blocks_count; /* Blocks count */ 367 __u32 s_r_blocks_count; /* Reserved blocks count */ 368 __u32 s_free_blocks_count; /* Free blocks count */ 369 __u32 s_free_inodes_count; /* Free inodes count */ 370 __u32 s_first_data_block; /* First Data Block */ 371 __u32 s_log_block_size; /* Block size */ 372 __s32 s_log_frag_size; /* Fragment size */ 373 __u32 s_blocks_per_group; /* # Blocks per group */ 374 __u32 s_frags_per_group; /* # Fragments per group */ 375 __u32 s_inodes_per_group; /* # Inodes per group */ 376 __u32 s_mtime; /* Mount time */ 377 __u32 s_wtime; /* Write time */ 378 __u16 s_mnt_count; /* Mount count */ 379 __s16 s_max_mnt_count; /* Maximal mount count */ 380 __u16 s_magic; /* Magic signature */ 381 __u16 s_state; /* File system state */ 382 __u16 s_errors; /* Behaviour when detecting errors */ 383 __u16 s_minor_rev_level; /* minor revision level */ 384 __u32 s_lastcheck; /* time of last check */ 385 __u32 s_checkinterval; /* max. time between checks */ 386 __u32 s_creator_os; /* OS */ 387 __u32 s_rev_level; /* Revision level */ 388 __u16 s_def_resuid; /* Default uid for reserved blocks */ 389 __u16 s_def_resgid; /* Default gid for reserved blocks */ 390 /* 391 * These fields are for EXT2_DYNAMIC_REV superblocks only. 392 * 393 * Note: the difference between the compatible feature set and 394 * the incompatible feature set is that if there is a bit set 395 * in the incompatible feature set that the kernel doesn't 396 * know about, it should refuse to mount the filesystem. 397 * 398 * e2fsck's requirements are more strict; if it doesn't know 399 * about a feature in either the compatible or incompatible 400 * feature set, it must abort and not try to meddle with 401 * things it doesn't understand... 402 */ 403 __u32 s_first_ino; /* First non-reserved inode */ 404 __u16 s_inode_size; /* size of inode structure */ 405 __u16 s_block_group_nr; /* block group # of this superblock */ 406 __u32 s_feature_compat; /* compatible feature set */ 407 __u32 s_feature_incompat; /* incompatible feature set */ 408 __u32 s_feature_ro_compat; /* readonly-compatible feature set */ 409 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 410 char s_volume_name[16]; /* volume name */ 411 char s_last_mounted[64]; /* directory where last mounted */ 412 __u32 s_algorithm_usage_bitmap; /* For compression */ 413 /* 414 * Performance hints. Directory preallocation should only 415 * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on. 416 */ 417 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 418 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 419 __u16 s_padding1; 420 /* 421 * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set. 422 */ 423 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 424 __u32 s_journal_inum; /* inode number of journal file */ 425 __u32 s_journal_dev; /* device number of journal file */ 426 __u32 s_last_orphan; /* start of list of inodes to delete */ 427 428 __u32 s_reserved[197]; /* Padding to the end of the block */ 429}; 430 431#ifdef __KERNEL__ 432#define EXT2_SB(sb) (&((sb)->u.ext2_sb)) 433#else 434/* Assume that user mode programs are passing in an ext2fs superblock, not 435 * a kernel struct super_block. This will allow us to call the feature-test 436 * macros from user land. */ 437#define EXT2_SB(sb) (sb) 438#endif 439 440/* 441 * Codes for operating systems 442 */ 443#define EXT2_OS_LINUX 0 444#define EXT2_OS_HURD 1 445#define EXT2_OS_MASIX 2 446#define EXT2_OS_FREEBSD 3 447#define EXT2_OS_LITES 4 448 449/* 450 * Revision levels 451 */ 452#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 453#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 454 455#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 456#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 457 458#define EXT2_GOOD_OLD_INODE_SIZE 128 459 460/* 461 * Feature set definitions 462 */ 463 464#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 465 ( EXT2_SB(sb)->s_feature_compat & (mask) ) 466#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 467 ( EXT2_SB(sb)->s_feature_ro_compat & (mask) ) 468#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 469 ( EXT2_SB(sb)->s_feature_incompat & (mask) ) 470 471#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 472#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 473#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 474#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 475#define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010 476#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 477 478#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 479#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 480#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 481 482#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 483#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 484#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 485#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 486 487#define EXT2_FEATURE_COMPAT_SUPP 0 488#define EXT2_FEATURE_INCOMPAT_SUPP EXT2_FEATURE_INCOMPAT_FILETYPE 489#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 490 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 491 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 492 493/* 494 * Default values for user and/or group using reserved blocks 495 */ 496#define EXT2_DEF_RESUID 0 497#define EXT2_DEF_RESGID 0 498 499/* 500 * Structure of a directory entry 501 */ 502#define EXT2_NAME_LEN 255 503 504struct ext2_dir_entry { 505 __u32 inode; /* Inode number */ 506 __u16 rec_len; /* Directory entry length */ 507 __u16 name_len; /* Name length */ 508 char name[EXT2_NAME_LEN]; /* File name */ 509}; 510 511/* 512 * The new version of the directory entry. Since EXT2 structures are 513 * stored in intel byte order, and the name_len field could never be 514 * bigger than 255 chars, it's safe to reclaim the extra byte for the 515 * file_type field. 516 */ 517struct ext2_dir_entry_2 { 518 __u32 inode; /* Inode number */ 519 __u16 rec_len; /* Directory entry length */ 520 __u8 name_len; /* Name length */ 521 __u8 file_type; 522 char name[EXT2_NAME_LEN]; /* File name */ 523}; 524 525/* 526 * Ext2 directory file types. Only the low 3 bits are used. The 527 * other bits are reserved for now. 528 */ 529#define EXT2_FT_UNKNOWN 0 530#define EXT2_FT_REG_FILE 1 531#define EXT2_FT_DIR 2 532#define EXT2_FT_CHRDEV 3 533#define EXT2_FT_BLKDEV 4 534#define EXT2_FT_FIFO 5 535#define EXT2_FT_SOCK 6 536#define EXT2_FT_SYMLINK 7 537 538#define EXT2_FT_MAX 8 539 540/* 541 * EXT2_DIR_PAD defines the directory entries boundaries 542 * 543 * NOTE: It must be a multiple of 4 544 */ 545#define EXT2_DIR_PAD 4 546#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 547#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 548 ~EXT2_DIR_ROUND) 549 550#ifdef __KERNEL__ 551/* 552 * Function prototypes 553 */ 554 555/* 556 * Ok, these declarations are also in <linux/kernel.h> but none of the 557 * ext2 source programs needs to include it so they are duplicated here. 558 */ 559# define NORET_TYPE /**/ 560# define ATTRIB_NORET __attribute__((noreturn)) 561# define NORET_AND noreturn, 562 563/* acl.c */ 564extern int ext2_permission (struct inode *, int); 565 566/* balloc.c */ 567extern int ext2_bg_has_super(struct super_block *sb, int group); 568extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group); 569extern int ext2_new_block (const struct inode *, unsigned long, 570 __u32 *, __u32 *, int *); 571extern void ext2_free_blocks (const struct inode *, unsigned long, 572 unsigned long); 573extern unsigned long ext2_count_free_blocks (struct super_block *); 574extern void ext2_check_blocks_bitmap (struct super_block *); 575extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb, 576 unsigned int block_group, 577 struct buffer_head ** bh); 578 579/* bitmap.c */ 580extern unsigned long ext2_count_free (struct buffer_head *, unsigned); 581 582/* dir.c */ 583extern int ext2_check_dir_entry (const char *, struct inode *, 584 struct ext2_dir_entry_2 *, struct buffer_head *, 585 unsigned long); 586 587/* file.c */ 588extern int ext2_read (struct inode *, struct file *, char *, int); 589extern int ext2_write (struct inode *, struct file *, char *, int); 590 591/* fsync.c */ 592extern int ext2_sync_file (struct file *, struct dentry *, int); 593extern int ext2_fsync_inode (struct inode *, int); 594 595/* ialloc.c */ 596extern struct inode * ext2_new_inode (const struct inode *, int); 597extern void ext2_free_inode (struct inode *); 598extern unsigned long ext2_count_free_inodes (struct super_block *); 599extern void ext2_check_inodes_bitmap (struct super_block *); 600 601/* inode.c */ 602 603extern struct buffer_head * ext2_getblk (struct inode *, long, int, int *); 604extern struct buffer_head * ext2_bread (struct inode *, int, int, int *); 605 606extern void ext2_read_inode (struct inode *); 607extern void ext2_write_inode (struct inode *, int); 608extern void ext2_put_inode (struct inode *); 609extern void ext2_delete_inode (struct inode *); 610extern int ext2_sync_inode (struct inode *); 611extern void ext2_discard_prealloc (struct inode *); 612 613/* ioctl.c */ 614extern int ext2_ioctl (struct inode *, struct file *, unsigned int, 615 unsigned long); 616 617/* namei.c */ 618extern struct inode_operations ext2_dir_inode_operations; 619 620/* super.c */ 621extern void ext2_error (struct super_block *, const char *, const char *, ...) 622 __attribute__ ((format (printf, 3, 4))); 623extern NORET_TYPE void ext2_panic (struct super_block *, const char *, 624 const char *, ...) 625 __attribute__ ((NORET_AND format (printf, 3, 4))); 626extern void ext2_warning (struct super_block *, const char *, const char *, ...) 627 __attribute__ ((format (printf, 3, 4))); 628extern void ext2_update_dynamic_rev (struct super_block *sb); 629extern void ext2_put_super (struct super_block *); 630extern void ext2_write_super (struct super_block *); 631extern int ext2_remount (struct super_block *, int *, char *); 632extern struct super_block * ext2_read_super (struct super_block *,void *,int); 633extern int ext2_statfs (struct super_block *, struct statfs *); 634 635/* truncate.c */ 636extern void ext2_truncate (struct inode *); 637 638/* 639 * Inodes and files operations 640 */ 641 642/* dir.c */ 643extern struct file_operations ext2_dir_operations; 644 645/* file.c */ 646extern struct inode_operations ext2_file_inode_operations; 647extern struct file_operations ext2_file_operations; 648 649/* symlink.c */ 650extern struct inode_operations ext2_fast_symlink_inode_operations; 651 652extern struct address_space_operations ext2_aops; 653 654#endif /* __KERNEL__ */ 655 656#endif /* _LINUX_EXT2_FS_H */ 657