ext2_fs.h revision b10820cdcd5f007894b81cf716cf1fdd8523bbca
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 <asm/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 * Macro-instructions used to manage group descriptors 151 */ 152#ifdef __KERNEL__ 153# define EXT2_BLOCKS_PER_GROUP(s) ((s)->u.ext2_sb.s_blocks_per_group) 154# define EXT2_DESC_PER_BLOCK(s) ((s)->u.ext2_sb.s_desc_per_block) 155# define EXT2_INODES_PER_GROUP(s) ((s)->u.ext2_sb.s_inodes_per_group) 156# define EXT2_DESC_PER_BLOCK_BITS(s) ((s)->u.ext2_sb.s_desc_per_block_bits) 157#else 158# define EXT2_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 159# define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc)) 160# define EXT2_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 161#endif 162 163/* 164 * Constants relative to the data blocks 165 */ 166#define EXT2_NDIR_BLOCKS 12 167#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 168#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 169#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 170#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 171 172/* 173 * Inode flags 174 */ 175#define EXT2_SECRM_FL 0x00000001 /* Secure deletion */ 176#define EXT2_UNRM_FL 0x00000002 /* Undelete */ 177#define EXT2_COMPR_FL 0x00000004 /* Compress file */ 178#define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */ 179#define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */ 180#define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */ 181#define EXT2_NODUMP_FL 0x00000040 /* do not dump file */ 182#define EXT2_NOATIME_FL 0x00000080 /* do not update atime */ 183/* Reserved for compression usage... */ 184#define EXT2_DIRTY_FL 0x00000100 185#define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 186#define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */ 187#define EXT2_ECOMPR_FL 0x00000800 /* Compression error */ 188/* End compression flags --- maybe not all used */ 189#define EXT2_BTREE_FL 0x00001000 /* btree format dir */ 190#define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */ 191#define EXT2_IMAGIC_FL 0x00002000 192#define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 193#define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 194 195#define EXT2_FL_USER_VISIBLE 0x00005FFF /* User visible flags */ 196#define EXT2_FL_USER_MODIFIABLE 0x000000FF /* User modifiable flags */ 197 198/* 199 * ioctl commands 200 */ 201#define EXT2_IOC_GETFLAGS _IOR('f', 1, long) 202#define EXT2_IOC_SETFLAGS _IOW('f', 2, long) 203#define EXT2_IOC_GETVERSION _IOR('v', 1, long) 204#define EXT2_IOC_SETVERSION _IOW('v', 2, long) 205 206/* 207 * Structure of an inode on the disk 208 */ 209struct ext2_inode { 210 __u16 i_mode; /* File mode */ 211 __u16 i_uid; /* Low 16 bits of Owner Uid */ 212 __u32 i_size; /* Size in bytes */ 213 __u32 i_atime; /* Access time */ 214 __u32 i_ctime; /* Creation time */ 215 __u32 i_mtime; /* Modification time */ 216 __u32 i_dtime; /* Deletion Time */ 217 __u16 i_gid; /* Low 16 bits of Group Id */ 218 __u16 i_links_count; /* Links count */ 219 __u32 i_blocks; /* Blocks count */ 220 __u32 i_flags; /* File flags */ 221 union { 222 struct { 223 __u32 l_i_reserved1; 224 } linux1; 225 struct { 226 __u32 h_i_translator; 227 } hurd1; 228 struct { 229 __u32 m_i_reserved1; 230 } masix1; 231 } osd1; /* OS dependent 1 */ 232 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 233 __u32 i_generation; /* File version (for NFS) */ 234 __u32 i_file_acl; /* File ACL */ 235 __u32 i_dir_acl; /* Directory ACL */ 236 __u32 i_faddr; /* Fragment address */ 237 union { 238 struct { 239 __u8 l_i_frag; /* Fragment number */ 240 __u8 l_i_fsize; /* Fragment size */ 241 __u16 i_pad1; 242 __u16 l_i_uid_high; /* these 2 fields */ 243 __u16 l_i_gid_high; /* were reserved2[0] */ 244 __u32 l_i_reserved2; 245 } linux2; 246 struct { 247 __u8 h_i_frag; /* Fragment number */ 248 __u8 h_i_fsize; /* Fragment size */ 249 __u16 h_i_mode_high; 250 __u16 h_i_uid_high; 251 __u16 h_i_gid_high; 252 __u32 h_i_author; 253 } hurd2; 254 struct { 255 __u8 m_i_frag; /* Fragment number */ 256 __u8 m_i_fsize; /* Fragment size */ 257 __u16 m_pad1; 258 __u32 m_i_reserved2[2]; 259 } masix2; 260 } osd2; /* OS dependent 2 */ 261}; 262 263#define i_size_high i_dir_acl 264 265#if defined(__KERNEL__) || defined(__linux__) 266#define i_reserved1 osd1.linux1.l_i_reserved1 267#define i_frag osd2.linux2.l_i_frag 268#define i_fsize osd2.linux2.l_i_fsize 269#define i_uid_low i_uid 270#define i_gid_low i_gid 271#define i_uid_high osd2.linux2.l_i_uid_high 272#define i_gid_high osd2.linux2.l_i_gid_high 273#define i_reserved2 osd2.linux2.l_i_reserved2 274 275#elif defined(__GNU__) 276 277#define i_translator osd1.hurd1.h_i_translator 278#define i_frag osd2.hurd2.h_i_frag; 279#define i_fsize osd2.hurd2.h_i_fsize; 280#define i_uid_high osd2.hurd2.h_i_uid_high 281#define i_gid_high osd2.hurd2.h_i_gid_high 282#define i_author osd2.hurd2.h_i_author 283 284#elif defined(__masix__) 285 286#define i_reserved1 osd1.masix1.m_i_reserved1 287#define i_frag osd2.masix2.m_i_frag 288#define i_fsize osd2.masix2.m_i_fsize 289#define i_reserved2 osd2.masix2.m_i_reserved2 290 291#endif /* defined(__KERNEL) || defined(__linux__) */ 292 293/* 294 * File system states 295 */ 296#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 297#define EXT2_ERROR_FS 0x0002 /* Errors detected */ 298 299/* 300 * Mount flags 301 */ 302#define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */ 303#define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */ 304#define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */ 305#define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ 306#define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ 307#define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ 308#define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */ 309#define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */ 310 311#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 312#define set_opt(o, opt) o |= EXT2_MOUNT_##opt 313#define test_opt(sb, opt) ((sb)->u.ext2_sb.s_mount_opt & \ 314 EXT2_MOUNT_##opt) 315/* 316 * Maximal mount counts between two filesystem checks 317 */ 318#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 319#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 320 321/* 322 * Behaviour when detecting errors 323 */ 324#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 325#define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 326#define EXT2_ERRORS_PANIC 3 /* Panic */ 327#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 328 329/* 330 * Structure of the super block 331 */ 332struct ext2_super_block { 333 __u32 s_inodes_count; /* Inodes count */ 334 __u32 s_blocks_count; /* Blocks count */ 335 __u32 s_r_blocks_count; /* Reserved blocks count */ 336 __u32 s_free_blocks_count; /* Free blocks count */ 337 __u32 s_free_inodes_count; /* Free inodes count */ 338 __u32 s_first_data_block; /* First Data Block */ 339 __u32 s_log_block_size; /* Block size */ 340 __s32 s_log_frag_size; /* Fragment size */ 341 __u32 s_blocks_per_group; /* # Blocks per group */ 342 __u32 s_frags_per_group; /* # Fragments per group */ 343 __u32 s_inodes_per_group; /* # Inodes per group */ 344 __u32 s_mtime; /* Mount time */ 345 __u32 s_wtime; /* Write time */ 346 __u16 s_mnt_count; /* Mount count */ 347 __s16 s_max_mnt_count; /* Maximal mount count */ 348 __u16 s_magic; /* Magic signature */ 349 __u16 s_state; /* File system state */ 350 __u16 s_errors; /* Behaviour when detecting errors */ 351 __u16 s_minor_rev_level; /* minor revision level */ 352 __u32 s_lastcheck; /* time of last check */ 353 __u32 s_checkinterval; /* max. time between checks */ 354 __u32 s_creator_os; /* OS */ 355 __u32 s_rev_level; /* Revision level */ 356 __u16 s_def_resuid; /* Default uid for reserved blocks */ 357 __u16 s_def_resgid; /* Default gid for reserved blocks */ 358 /* 359 * These fields are for EXT2_DYNAMIC_REV superblocks only. 360 * 361 * Note: the difference between the compatible feature set and 362 * the incompatible feature set is that if there is a bit set 363 * in the incompatible feature set that the kernel doesn't 364 * know about, it should refuse to mount the filesystem. 365 * 366 * e2fsck's requirements are more strict; if it doesn't know 367 * about a feature in either the compatible or incompatible 368 * feature set, it must abort and not try to meddle with 369 * things it doesn't understand... 370 */ 371 __u32 s_first_ino; /* First non-reserved inode */ 372 __u16 s_inode_size; /* size of inode structure */ 373 __u16 s_block_group_nr; /* block group # of this superblock */ 374 __u32 s_feature_compat; /* compatible feature set */ 375 __u32 s_feature_incompat; /* incompatible feature set */ 376 __u32 s_feature_ro_compat; /* readonly-compatible feature set */ 377 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 378 char s_volume_name[16]; /* volume name */ 379 char s_last_mounted[64]; /* directory where last mounted */ 380 __u32 s_algorithm_usage_bitmap; /* For compression */ 381 /* 382 * Performance hints. Directory preallocation should only 383 * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on. 384 */ 385 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 386 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 387 __u16 s_padding1; 388 /* 389 * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set. 390 */ 391 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 392 __u32 s_journal_inum; /* inode number of journal file */ 393 __u32 s_journal_dev; /* device number of journal file */ 394 __u32 s_last_orphan; /* start of list of inodes to delete */ 395 396 __u32 s_reserved[197]; /* Padding to the end of the block */ 397}; 398 399#ifdef __KERNEL__ 400#define EXT2_SB(sb) (&((sb)->u.ext2_sb)) 401#else 402/* Assume that user mode programs are passing in an ext2fs superblock, not 403 * a kernel struct super_block. This will allow us to call the feature-test 404 * macros from user land. */ 405#define EXT2_SB(sb) (sb) 406#endif 407 408/* 409 * Codes for operating systems 410 */ 411#define EXT2_OS_LINUX 0 412#define EXT2_OS_HURD 1 413#define EXT2_OS_MASIX 2 414#define EXT2_OS_FREEBSD 3 415#define EXT2_OS_LITES 4 416 417/* 418 * Revision levels 419 */ 420#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 421#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 422 423#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 424#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 425 426#define EXT2_GOOD_OLD_INODE_SIZE 128 427 428/* 429 * Feature set definitions 430 */ 431 432#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 433 ( EXT2_SB(sb)->s_feature_compat & (mask) ) 434#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 435 ( EXT2_SB(sb)->s_feature_ro_compat & (mask) ) 436#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 437 ( EXT2_SB(sb)->s_feature_incompat & (mask) ) 438 439#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 440#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 441#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 442#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 443#define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010 444#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 445 446#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 447#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 448#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 449 450#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 451#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 452#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 453#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 454 455#define EXT2_FEATURE_COMPAT_SUPP 0 456#define EXT2_FEATURE_INCOMPAT_SUPP EXT2_FEATURE_INCOMPAT_FILETYPE 457#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 458 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 459 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 460 461/* 462 * Default values for user and/or group using reserved blocks 463 */ 464#define EXT2_DEF_RESUID 0 465#define EXT2_DEF_RESGID 0 466 467/* 468 * Structure of a directory entry 469 */ 470#define EXT2_NAME_LEN 255 471 472struct ext2_dir_entry { 473 __u32 inode; /* Inode number */ 474 __u16 rec_len; /* Directory entry length */ 475 __u16 name_len; /* Name length */ 476 char name[EXT2_NAME_LEN]; /* File name */ 477}; 478 479/* 480 * The new version of the directory entry. Since EXT2 structures are 481 * stored in intel byte order, and the name_len field could never be 482 * bigger than 255 chars, it's safe to reclaim the extra byte for the 483 * file_type field. 484 */ 485struct ext2_dir_entry_2 { 486 __u32 inode; /* Inode number */ 487 __u16 rec_len; /* Directory entry length */ 488 __u8 name_len; /* Name length */ 489 __u8 file_type; 490 char name[EXT2_NAME_LEN]; /* File name */ 491}; 492 493/* 494 * Ext2 directory file types. Only the low 3 bits are used. The 495 * other bits are reserved for now. 496 */ 497#define EXT2_FT_UNKNOWN 0 498#define EXT2_FT_REG_FILE 1 499#define EXT2_FT_DIR 2 500#define EXT2_FT_CHRDEV 3 501#define EXT2_FT_BLKDEV 4 502#define EXT2_FT_FIFO 5 503#define EXT2_FT_SOCK 6 504#define EXT2_FT_SYMLINK 7 505 506#define EXT2_FT_MAX 8 507 508/* 509 * EXT2_DIR_PAD defines the directory entries boundaries 510 * 511 * NOTE: It must be a multiple of 4 512 */ 513#define EXT2_DIR_PAD 4 514#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 515#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 516 ~EXT2_DIR_ROUND) 517 518#ifdef __KERNEL__ 519/* 520 * Function prototypes 521 */ 522 523/* 524 * Ok, these declarations are also in <linux/kernel.h> but none of the 525 * ext2 source programs needs to include it so they are duplicated here. 526 */ 527# define NORET_TYPE /**/ 528# define ATTRIB_NORET __attribute__((noreturn)) 529# define NORET_AND noreturn, 530 531/* acl.c */ 532extern int ext2_permission (struct inode *, int); 533 534/* balloc.c */ 535extern int ext2_bg_has_super(struct super_block *sb, int group); 536extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group); 537extern int ext2_new_block (const struct inode *, unsigned long, 538 __u32 *, __u32 *, int *); 539extern void ext2_free_blocks (const struct inode *, unsigned long, 540 unsigned long); 541extern unsigned long ext2_count_free_blocks (struct super_block *); 542extern void ext2_check_blocks_bitmap (struct super_block *); 543extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb, 544 unsigned int block_group, 545 struct buffer_head ** bh); 546 547/* bitmap.c */ 548extern unsigned long ext2_count_free (struct buffer_head *, unsigned); 549 550/* dir.c */ 551extern int ext2_check_dir_entry (const char *, struct inode *, 552 struct ext2_dir_entry_2 *, struct buffer_head *, 553 unsigned long); 554 555/* file.c */ 556extern int ext2_read (struct inode *, struct file *, char *, int); 557extern int ext2_write (struct inode *, struct file *, char *, int); 558 559/* fsync.c */ 560extern int ext2_sync_file (struct file *, struct dentry *, int); 561extern int ext2_fsync_inode (struct inode *, int); 562 563/* ialloc.c */ 564extern struct inode * ext2_new_inode (const struct inode *, int); 565extern void ext2_free_inode (struct inode *); 566extern unsigned long ext2_count_free_inodes (struct super_block *); 567extern void ext2_check_inodes_bitmap (struct super_block *); 568 569/* inode.c */ 570 571extern struct buffer_head * ext2_getblk (struct inode *, long, int, int *); 572extern struct buffer_head * ext2_bread (struct inode *, int, int, int *); 573 574extern void ext2_read_inode (struct inode *); 575extern void ext2_write_inode (struct inode *, int); 576extern void ext2_put_inode (struct inode *); 577extern void ext2_delete_inode (struct inode *); 578extern int ext2_sync_inode (struct inode *); 579extern void ext2_discard_prealloc (struct inode *); 580 581/* ioctl.c */ 582extern int ext2_ioctl (struct inode *, struct file *, unsigned int, 583 unsigned long); 584 585/* namei.c */ 586extern struct inode_operations ext2_dir_inode_operations; 587 588/* super.c */ 589extern void ext2_error (struct super_block *, const char *, const char *, ...) 590 __attribute__ ((format (printf, 3, 4))); 591extern NORET_TYPE void ext2_panic (struct super_block *, const char *, 592 const char *, ...) 593 __attribute__ ((NORET_AND format (printf, 3, 4))); 594extern void ext2_warning (struct super_block *, const char *, const char *, ...) 595 __attribute__ ((format (printf, 3, 4))); 596extern void ext2_update_dynamic_rev (struct super_block *sb); 597extern void ext2_put_super (struct super_block *); 598extern void ext2_write_super (struct super_block *); 599extern int ext2_remount (struct super_block *, int *, char *); 600extern struct super_block * ext2_read_super (struct super_block *,void *,int); 601extern int ext2_statfs (struct super_block *, struct statfs *); 602 603/* truncate.c */ 604extern void ext2_truncate (struct inode *); 605 606/* 607 * Inodes and files operations 608 */ 609 610/* dir.c */ 611extern struct file_operations ext2_dir_operations; 612 613/* file.c */ 614extern struct inode_operations ext2_file_inode_operations; 615extern struct file_operations ext2_file_operations; 616 617/* symlink.c */ 618extern struct inode_operations ext2_fast_symlink_inode_operations; 619 620extern struct address_space_operations ext2_aops; 621 622#endif /* __KERNEL__ */ 623 624#endif /* _LINUX_EXT2_FS_H */ 625