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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 | /* * linux/include/linux/ext2_fs.h * * Copyright (C) 1992, 1993, 1994 Remy Card (card@masi.ibp.fr) * Laboratoire MASI - Institut Blaise Pascal * Universite Pierre et Marie Curie (Paris VI) * * from * * linux/include/linux/minix_fs.h * * Copyright (C) 1991, 1992 Linus Torvalds */ #ifndef _LINUX_EXT2_FS_H #define _LINUX_EXT2_FS_H /* * The second extended filesystem constants/structures */ /* * Define EXT2FS_DEBUG to produce debug messages */ #undef EXT2FS_DEBUG /* * Define EXT2FS_DEBUG_CACHE to produce cache debug messages */ #undef EXT2FS_DEBUG_CACHE /* * Define EXT2FS_CHECK_CACHE to add some checks to the name cache code */ #undef EXT2FS_CHECK_CACHE /* * Define EXT2FS_PRE_02B_COMPAT to convert ext 2 fs prior to 0.2b */ #undef EXT2FS_PRE_02B_COMPAT /* * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files */ #define EXT2_PREALLOCATE /* * The second extended file system version */ #define EXT2FS_DATE "94/10/23" #define EXT2FS_VERSION "0.5a" /* * Debug code */ #ifdef EXT2FS_DEBUG # define ext2_debug(f, a...) { \ printk ("EXT2-fs DEBUG (%s, %d): %s:", \ __FILE__, __LINE__, __FUNCTION__); \ printk (f, ## a); \ } #else # define ext2_debug(f, a...) /**/ #endif /* * Special inodes numbers */ #define EXT2_BAD_INO 1 /* Bad blocks inode */ #define EXT2_ROOT_INO 2 /* Root inode */ #define EXT2_ACL_IDX_INO 3 /* ACL inode */ #define EXT2_ACL_DATA_INO 4 /* ACL inode */ #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ #define EXT2_FIRST_INO 11 /* First non reserved inode */ /* * The second extended file system magic number */ #define EXT2_PRE_02B_MAGIC 0xEF51 #define EXT2_SUPER_MAGIC 0xEF53 /* * Maximal count of links to a file */ #define EXT2_LINK_MAX 32000 /* * Macro-instructions used to manage several block sizes */ #define EXT2_MIN_BLOCK_SIZE 1024 #define EXT2_MAX_BLOCK_SIZE 4096 #define EXT2_MIN_BLOCK_LOG_SIZE 10 #ifdef __KERNEL__ # define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) #else # define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size) #endif #define EXT2_ACLE_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_acl_entry)) #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (unsigned long)) #ifdef __KERNEL__ # define EXT2_BLOCK_SIZE_BITS(s) ((s)->u.ext2_sb.s_es->s_log_block_size + 10) #else # define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) #endif #define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_inode)) /* * Macro-instructions used to manage fragments */ #define EXT2_MIN_FRAG_SIZE 1024 #define EXT2_MAX_FRAG_SIZE 4096 #define EXT2_MIN_FRAG_LOG_SIZE 10 #ifdef __KERNEL__ # define EXT2_FRAG_SIZE(s) ((s)->u.ext2_sb.s_frag_size) # define EXT2_FRAGS_PER_BLOCK(s) ((s)->u.ext2_sb.s_frags_per_block) #else # define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size) # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s)) #endif /* * ACL structures */ struct ext2_acl_header /* Header of Access Control Lists */ { unsigned long aclh_size; unsigned long aclh_file_count; unsigned long aclh_acle_count; unsigned long aclh_first_acle; }; struct ext2_acl_entry /* Access Control List Entry */ { unsigned long acle_size; unsigned short acle_perms; /* Access permissions */ unsigned short acle_type; /* Type of entry */ unsigned short acle_tag; /* User or group identity */ unsigned short acle_pad1; unsigned long acle_next; /* Pointer on next entry for the */ /* same inode or on next free entry */ }; /* * Structure of a blocks group descriptor */ struct ext2_old_group_desc { unsigned long bg_block_bitmap; /* Blocks bitmap block */ unsigned long bg_inode_bitmap; /* Inodes bitmap block */ unsigned long bg_inode_table; /* Inodes table block */ unsigned short bg_free_blocks_count; /* Free blocks count */ unsigned short bg_free_inodes_count; /* Free inodes count */ }; struct ext2_group_desc { unsigned long bg_block_bitmap; /* Blocks bitmap block */ unsigned long bg_inode_bitmap; /* Inodes bitmap block */ unsigned long bg_inode_table; /* Inodes table block */ unsigned short bg_free_blocks_count; /* Free blocks count */ unsigned short bg_free_inodes_count; /* Free inodes count */ unsigned short bg_used_dirs_count; /* Directories count */ unsigned short bg_pad; unsigned long bg_reserved[3]; }; /* * Macro-instructions used to manage group descriptors */ #ifdef __KERNEL__ # define EXT2_BLOCKS_PER_GROUP(s) ((s)->u.ext2_sb.s_blocks_per_group) # define EXT2_DESC_PER_BLOCK(s) ((s)->u.ext2_sb.s_desc_per_block) # define EXT2_INODES_PER_GROUP(s) ((s)->u.ext2_sb.s_inodes_per_group) #else # define EXT2_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) # define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc)) # define EXT2_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) #endif /* * Constants relative to the data blocks */ #define EXT2_NDIR_BLOCKS 12 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) /* * Inode flags */ #define EXT2_SECRM_FL 0x00000001 /* Secure deletion */ #define EXT2_UNRM_FL 0x00000002 /* Undelete */ #define EXT2_COMPR_FL 0x00000004 /* Compress file */ #define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */ #define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */ #define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */ #define EXT2_NODUMP_FL 0x00000040 /* do not dump file */ /* * ioctl commands */ #define EXT2_IOC_GETFLAGS _IOR('f', 1, long) #define EXT2_IOC_SETFLAGS _IOW('f', 2, long) #define EXT2_IOC_GETVERSION _IOR('v', 1, long) #define EXT2_IOC_SETVERSION _IOW('v', 2, long) /* * Structure of an inode on the disk */ struct ext2_inode { unsigned short i_mode; /* File mode */ unsigned short i_uid; /* Owner Uid */ unsigned long i_size; /* Size in bytes */ unsigned long i_atime; /* Access time */ unsigned long i_ctime; /* Creation time */ unsigned long i_mtime; /* Modification time */ unsigned long i_dtime; /* Deletion Time */ unsigned short i_gid; /* Group Id */ unsigned short i_links_count; /* Links count */ unsigned long i_blocks; /* Blocks count */ unsigned long i_flags; /* File flags */ union { struct { unsigned long l_i_reserved1; } linux1; struct { unsigned long h_i_translator; } hurd1; struct { unsigned long m_i_reserved1; } masix1; } osd1; /* OS dependent 1 */ unsigned long i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ unsigned long i_version; /* File version (for NFS) */ unsigned long i_file_acl; /* File ACL */ unsigned long i_dir_acl; /* Directory ACL */ unsigned long i_faddr; /* Fragment address */ union { struct { unsigned char l_i_frag; /* Fragment number */ unsigned char l_i_fsize; /* Fragment size */ unsigned short i_pad1; unsigned long l_i_reserved2[2]; } linux2; struct { unsigned char h_i_frag; /* Fragment number */ unsigned char h_i_fsize; /* Fragment size */ unsigned short h_i_mode_high; unsigned short h_i_uid_high; unsigned short h_i_gid_high; unsigned long h_i_author; } hurd2; struct { unsigned char m_i_frag; /* Fragment number */ unsigned char m_i_fsize; /* Fragment size */ unsigned short m_pad1; unsigned long m_i_reserved2[2]; } masix2; } osd2; /* OS dependent 2 */ }; #ifdef __linux__ #define i_reserved1 osd1.linux1.l_i_reserved1 #define i_frag osd2.linux2.l_i_frag #define i_fsize osd2.linux2.l_i_fsize #define i_reserved2 osd2.linux2.l_i_reserved2 #endif #ifdef __hurd__ #define i_translator osd1.hurd1.h_i_translator #define i_frag osd2.hurd2.h_i_frag; #define i_fsize osd2.hurd2.h_i_fsize; #define i_uid_high osd2.hurd2.h_i_uid_high #define i_gid_high osd2.hurd2.h_i_gid_high #define i_author osd2.hurd2.h_i_author #endif #ifdef __masix__ #define i_reserved1 osd1.masix1.m_i_reserved1 #define i_frag osd2.masix2.m_i_frag #define i_fsize osd2.masix2.m_i_fsize #define i_reserved2 osd2.masix2.m_i_reserved2 #endif /* * File system states */ #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ #define EXT2_ERROR_FS 0x0002 /* Errors detected */ /* * Mount flags */ #define EXT2_MOUNT_CHECK_NORMAL 0x0001 /* Do some more checks */ #define EXT2_MOUNT_CHECK_STRICT 0x0002 /* Do again more checks */ #define EXT2_MOUNT_CHECK (EXT2_MOUNT_CHECK_NORMAL | \ EXT2_MOUNT_CHECK_STRICT) #define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */ #define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */ #define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ #define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ #define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ #define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */ #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt #define set_opt(o, opt) o |= EXT2_MOUNT_##opt #define test_opt(sb, opt) ((sb)->u.ext2_sb.s_mount_opt & \ EXT2_MOUNT_##opt) /* * Maximal mount counts between two filesystem checks */ #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ /* * Behaviour when detecting errors */ #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ #define EXT2_ERRORS_RO 2 /* Remount fs read-only */ #define EXT2_ERRORS_PANIC 3 /* Panic */ #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE /* * Structure of the super block */ struct ext2_super_block { unsigned long s_inodes_count; /* Inodes count */ unsigned long s_blocks_count; /* Blocks count */ unsigned long s_r_blocks_count;/* Reserved blocks count */ unsigned long s_free_blocks_count;/* Free blocks count */ unsigned long s_free_inodes_count;/* Free inodes count */ unsigned long s_first_data_block;/* First Data Block */ unsigned long s_log_block_size;/* Block size */ long s_log_frag_size; /* Fragment size */ unsigned long s_blocks_per_group;/* # Blocks per group */ unsigned long s_frags_per_group;/* # Fragments per group */ unsigned long s_inodes_per_group;/* # Inodes per group */ unsigned long s_mtime; /* Mount time */ unsigned long s_wtime; /* Write time */ unsigned short s_mnt_count; /* Mount count */ short s_max_mnt_count; /* Maximal mount count */ unsigned short s_magic; /* Magic signature */ unsigned short s_state; /* File system state */ unsigned short s_errors; /* Behaviour when detecting errors */ unsigned short s_pad; unsigned long s_lastcheck; /* time of last check */ unsigned long s_checkinterval; /* max. time between checks */ unsigned long s_creator_os; /* OS */ unsigned long s_rev_level; /* Revision level */ unsigned short s_def_resuid; /* Default uid for reserved blocks */ unsigned short s_def_resgid; /* Default gid for reserved blocks */ unsigned long s_reserved[235]; /* Padding to the end of the block */ }; #define EXT2_OS_LINUX 0 #define EXT2_OS_HURD 1 #define EXT2_OS_MASIX 2 #define EXT2_CURRENT_REV 0 #define EXT2_DEF_RESUID 0 #define EXT2_DEF_RESGID 0 /* * Structure of a directory entry */ #define EXT2_NAME_LEN 255 struct ext2_dir_entry { unsigned long inode; /* Inode number */ unsigned short rec_len; /* Directory entry length */ unsigned short name_len; /* Name length */ char name[EXT2_NAME_LEN]; /* File name */ }; /* * EXT2_DIR_PAD defines the directory entries boundaries * * NOTE: It must be a multiple of 4 */ #define EXT2_DIR_PAD 4 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ ~EXT2_DIR_ROUND) #ifdef __KERNEL__ /* * Function prototypes */ /* * Ok, these declarations are also in <linux/kernel.h> but none of the * ext2 source programs needs to include it so they are duplicated here. */ #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 5) # define NORET_TYPE __volatile__ # define ATTRIB_NORET /**/ # define NORET_AND /**/ #else # define NORET_TYPE /**/ # define ATTRIB_NORET __attribute__((noreturn)) # define NORET_AND noreturn, #endif /* acl.c */ extern int ext2_permission (struct inode *, int); /* balloc.c */ extern int ext2_new_block (struct super_block *, unsigned long, unsigned long *, unsigned long *); extern void ext2_free_blocks (struct super_block *, unsigned long, unsigned long); extern unsigned long ext2_count_free_blocks (struct super_block *); extern void ext2_check_blocks_bitmap (struct super_block *); /* bitmap.c */ extern unsigned long ext2_count_free (struct buffer_head *, unsigned); /* dir.c */ extern int ext2_check_dir_entry (char *, struct inode *, struct ext2_dir_entry *, struct buffer_head *, unsigned long); /* file.c */ extern int ext2_read (struct inode *, struct file *, char *, int); extern int ext2_write (struct inode *, struct file *, char *, int); /* fsync.c */ extern int ext2_sync_file (struct inode *, struct file *); /* ialloc.c */ extern struct inode * ext2_new_inode (const struct inode *, int); extern void ext2_free_inode (struct inode *); extern unsigned long ext2_count_free_inodes (struct super_block *); extern void ext2_check_inodes_bitmap (struct super_block *); /* inode.c */ extern int ext2_bmap (struct inode *, int); extern struct buffer_head * ext2_getblk (struct inode *, long, int, int *); extern struct buffer_head * ext2_bread (struct inode *, int, int, int *); extern int ext2_getcluster (struct inode * inode, long block); extern void ext2_read_inode (struct inode *); extern void ext2_write_inode (struct inode *); extern void ext2_put_inode (struct inode *); extern int ext2_sync_inode (struct inode *); extern void ext2_discard_prealloc (struct inode *); /* ioctl.c */ extern int ext2_ioctl (struct inode *, struct file *, unsigned int, unsigned long); /* namei.c */ extern void ext2_release (struct inode *, struct file *); extern int ext2_lookup (struct inode *,const char *, int, struct inode **); extern int ext2_create (struct inode *,const char *, int, int, struct inode **); extern int ext2_mkdir (struct inode *, const char *, int, int); extern int ext2_rmdir (struct inode *, const char *, int); extern int ext2_unlink (struct inode *, const char *, int); extern int ext2_symlink (struct inode *, const char *, int, const char *); extern int ext2_link (struct inode *, struct inode *, const char *, int); extern int ext2_mknod (struct inode *, const char *, int, int, int); extern int ext2_rename (struct inode *, const char *, int, struct inode *, const char *, int); /* super.c */ extern void ext2_error (struct super_block *, const char *, const char *, ...) __attribute__ ((format (printf, 3, 4))); extern NORET_TYPE void ext2_panic (struct super_block *, const char *, const char *, ...) __attribute__ ((NORET_AND format (printf, 3, 4))); extern void ext2_warning (struct super_block *, const char *, const char *, ...) __attribute__ ((format (printf, 3, 4))); extern void ext2_put_super (struct super_block *); extern void ext2_write_super (struct super_block *); extern int ext2_remount (struct super_block *, int *, char *); extern struct super_block * ext2_read_super (struct super_block *,void *,int); extern void ext2_statfs (struct super_block *, struct statfs *); /* truncate.c */ extern void ext2_truncate (struct inode *); /* * Inodes and files operations */ /* dir.c */ extern struct inode_operations ext2_dir_inode_operations; /* file.c */ extern struct inode_operations ext2_file_inode_operations; /* symlink.c */ extern struct inode_operations ext2_symlink_inode_operations; #endif /* __KERNEL__ */ #endif /* _LINUX_EXT2_FS_H */ |