1 /* 2 * Copyright (C) 1992, 1993, 1994, 1995 3 * Remy Card (card@masi.ibp.fr) 4 * Laboratoire MASI - Institut Blaise Pascal 5 * Universite Pierre et Marie Curie (Paris VI) 6 * 7 * from 8 * 9 * linux/include/linux/minix_fs.h 10 * 11 * Copyright (C) 1991, 1992 Linus Torvalds 12 */ 13 #include <linux/fs.h> 14 #include <linux/ext2_fs.h> 15 #include <linux/blockgroup_lock.h> 16 #include <linux/percpu_counter.h> 17 #include <linux/rbtree.h> 18 19 /* XXX Here for now... not interested in restructing headers JUST now */ 20 21 /* data type for block offset of block group */ 22 typedef int ext2_grpblk_t; 23 24 /* data type for filesystem-wide blocks number */ 25 typedef unsigned long ext2_fsblk_t; 26 27 #define E2FSBLK "%lu" 28 29 struct ext2_reserve_window { 30 ext2_fsblk_t _rsv_start; /* First byte reserved */ 31 ext2_fsblk_t _rsv_end; /* Last byte reserved or 0 */ 32 }; 33 34 struct ext2_reserve_window_node { 35 struct rb_node rsv_node; 36 __u32 rsv_goal_size; 37 __u32 rsv_alloc_hit; 38 struct ext2_reserve_window rsv_window; 39 }; 40 41 struct ext2_block_alloc_info { 42 /* information about reservation window */ 43 struct ext2_reserve_window_node rsv_window_node; 44 /* 45 * was i_next_alloc_block in ext2_inode_info 46 * is the logical (file-relative) number of the 47 * most-recently-allocated block in this file. 48 * We use this for detecting linearly ascending allocation requests. 49 */ 50 __u32 last_alloc_logical_block; 51 /* 52 * Was i_next_alloc_goal in ext2_inode_info 53 * is the *physical* companion to i_next_alloc_block. 54 * it the the physical block number of the block which was most-recentl 55 * allocated to this file. This give us the goal (target) for the next 56 * allocation when we detect linearly ascending requests. 57 */ 58 ext2_fsblk_t last_alloc_physical_block; 59 }; 60 61 #define rsv_start rsv_window._rsv_start 62 #define rsv_end rsv_window._rsv_end 63 64 /* 65 * second extended-fs super-block data in memory 66 */ 67 struct ext2_sb_info { 68 unsigned long s_frag_size; /* Size of a fragment in bytes */ 69 unsigned long s_frags_per_block;/* Number of fragments per block */ 70 unsigned long s_inodes_per_block;/* Number of inodes per block */ 71 unsigned long s_frags_per_group;/* Number of fragments in a group */ 72 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 73 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 74 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 75 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 76 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 77 unsigned long s_groups_count; /* Number of groups in the fs */ 78 unsigned long s_overhead_last; /* Last calculated overhead */ 79 unsigned long s_blocks_last; /* Last seen block count */ 80 struct buffer_head * s_sbh; /* Buffer containing the super block */ 81 struct ext2_super_block * s_es; /* Pointer to the super block in the buffer */ 82 struct buffer_head ** s_group_desc; 83 unsigned long s_mount_opt; 84 unsigned long s_sb_block; 85 kuid_t s_resuid; 86 kgid_t s_resgid; 87 unsigned short s_mount_state; 88 unsigned short s_pad; 89 int s_addr_per_block_bits; 90 int s_desc_per_block_bits; 91 int s_inode_size; 92 int s_first_ino; 93 spinlock_t s_next_gen_lock; 94 u32 s_next_generation; 95 unsigned long s_dir_count; 96 u8 *s_debts; 97 struct percpu_counter s_freeblocks_counter; 98 struct percpu_counter s_freeinodes_counter; 99 struct percpu_counter s_dirs_counter; 100 struct blockgroup_lock *s_blockgroup_lock; 101 /* root of the per fs reservation window tree */ 102 spinlock_t s_rsv_window_lock; 103 struct rb_root s_rsv_window_root; 104 struct ext2_reserve_window_node s_rsv_window_head; 105 /* 106 * s_lock protects against concurrent modifications of s_mount_state, 107 * s_blocks_last, s_overhead_last and the content of superblock's 108 * buffer pointed to by sbi->s_es. 109 * 110 * Note: It is used in ext2_show_options() to provide a consistent view 111 * of the mount options. 112 */ 113 spinlock_t s_lock; 114 }; 115 116 static inline spinlock_t * 117 sb_bgl_lock(struct ext2_sb_info *sbi, unsigned int block_group) 118 { 119 return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group); 120 } 121 122 /* 123 * Define EXT2FS_DEBUG to produce debug messages 124 */ 125 #undef EXT2FS_DEBUG 126 127 /* 128 * Define EXT2_RESERVATION to reserve data blocks for expanding files 129 */ 130 #define EXT2_DEFAULT_RESERVE_BLOCKS 8 131 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */ 132 #define EXT2_MAX_RESERVE_BLOCKS 1027 133 #define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0 134 /* 135 * The second extended file system version 136 */ 137 #define EXT2FS_DATE "95/08/09" 138 #define EXT2FS_VERSION "0.5b" 139 140 /* 141 * Debug code 142 */ 143 #ifdef EXT2FS_DEBUG 144 # define ext2_debug(f, a...) { \ 145 printk ("EXT2-fs DEBUG (%s, %d): %s:", \ 146 __FILE__, __LINE__, __func__); \ 147 printk (f, ## a); \ 148 } 149 #else 150 # define ext2_debug(f, a...) /**/ 151 #endif 152 153 /* 154 * Special inode numbers 155 */ 156 #define EXT2_BAD_INO 1 /* Bad blocks inode */ 157 #define EXT2_ROOT_INO 2 /* Root inode */ 158 #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ 159 #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ 160 161 /* First non-reserved inode for old ext2 filesystems */ 162 #define EXT2_GOOD_OLD_FIRST_INO 11 163 164 static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb) 165 { 166 return sb->s_fs_info; 167 } 168 169 /* 170 * Macro-instructions used to manage several block sizes 171 */ 172 #define EXT2_MIN_BLOCK_SIZE 1024 173 #define EXT2_MAX_BLOCK_SIZE 4096 174 #define EXT2_MIN_BLOCK_LOG_SIZE 10 175 #define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) 176 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32)) 177 #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 178 #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits) 179 #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size) 180 #define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino) 181 182 /* 183 * Macro-instructions used to manage fragments 184 */ 185 #define EXT2_MIN_FRAG_SIZE 1024 186 #define EXT2_MAX_FRAG_SIZE 4096 187 #define EXT2_MIN_FRAG_LOG_SIZE 10 188 #define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->s_frag_size) 189 #define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->s_frags_per_block) 190 191 /* 192 * Structure of a blocks group descriptor 193 */ 194 struct ext2_group_desc 195 { 196 __le32 bg_block_bitmap; /* Blocks bitmap block */ 197 __le32 bg_inode_bitmap; /* Inodes bitmap block */ 198 __le32 bg_inode_table; /* Inodes table block */ 199 __le16 bg_free_blocks_count; /* Free blocks count */ 200 __le16 bg_free_inodes_count; /* Free inodes count */ 201 __le16 bg_used_dirs_count; /* Directories count */ 202 __le16 bg_pad; 203 __le32 bg_reserved[3]; 204 }; 205 206 /* 207 * Macro-instructions used to manage group descriptors 208 */ 209 #define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 210 #define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) 211 #define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 212 #define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 213 214 /* 215 * Constants relative to the data blocks 216 */ 217 #define EXT2_NDIR_BLOCKS 12 218 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 219 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 220 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 221 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 222 223 /* 224 * Inode flags (GETFLAGS/SETFLAGS) 225 */ 226 #define EXT2_SECRM_FL FS_SECRM_FL /* Secure deletion */ 227 #define EXT2_UNRM_FL FS_UNRM_FL /* Undelete */ 228 #define EXT2_COMPR_FL FS_COMPR_FL /* Compress file */ 229 #define EXT2_SYNC_FL FS_SYNC_FL /* Synchronous updates */ 230 #define EXT2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */ 231 #define EXT2_APPEND_FL FS_APPEND_FL /* writes to file may only append */ 232 #define EXT2_NODUMP_FL FS_NODUMP_FL /* do not dump file */ 233 #define EXT2_NOATIME_FL FS_NOATIME_FL /* do not update atime */ 234 /* Reserved for compression usage... */ 235 #define EXT2_DIRTY_FL FS_DIRTY_FL 236 #define EXT2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */ 237 #define EXT2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */ 238 #define EXT2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */ 239 /* End compression flags --- maybe not all used */ 240 #define EXT2_BTREE_FL FS_BTREE_FL /* btree format dir */ 241 #define EXT2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */ 242 #define EXT2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */ 243 #define EXT2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */ 244 #define EXT2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */ 245 #define EXT2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */ 246 #define EXT2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/ 247 #define EXT2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */ 248 249 #define EXT2_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */ 250 #define EXT2_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */ 251 252 /* Flags that should be inherited by new inodes from their parent. */ 253 #define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\ 254 EXT2_SYNC_FL | EXT2_NODUMP_FL |\ 255 EXT2_NOATIME_FL | EXT2_COMPRBLK_FL |\ 256 EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\ 257 EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL) 258 259 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 260 #define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL)) 261 262 /* Flags that are appropriate for non-directories/regular files. */ 263 #define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL) 264 265 /* Mask out flags that are inappropriate for the given type of inode. */ 266 static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags) 267 { 268 if (S_ISDIR(mode)) 269 return flags; 270 else if (S_ISREG(mode)) 271 return flags & EXT2_REG_FLMASK; 272 else 273 return flags & EXT2_OTHER_FLMASK; 274 } 275 276 /* 277 * ioctl commands 278 */ 279 #define EXT2_IOC_GETFLAGS FS_IOC_GETFLAGS 280 #define EXT2_IOC_SETFLAGS FS_IOC_SETFLAGS 281 #define EXT2_IOC_GETVERSION FS_IOC_GETVERSION 282 #define EXT2_IOC_SETVERSION FS_IOC_SETVERSION 283 #define EXT2_IOC_GETRSVSZ _IOR('f', 5, long) 284 #define EXT2_IOC_SETRSVSZ _IOW('f', 6, long) 285 286 /* 287 * ioctl commands in 32 bit emulation 288 */ 289 #define EXT2_IOC32_GETFLAGS FS_IOC32_GETFLAGS 290 #define EXT2_IOC32_SETFLAGS FS_IOC32_SETFLAGS 291 #define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION 292 #define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION 293 294 /* 295 * Structure of an inode on the disk 296 */ 297 struct ext2_inode { 298 __le16 i_mode; /* File mode */ 299 __le16 i_uid; /* Low 16 bits of Owner Uid */ 300 __le32 i_size; /* Size in bytes */ 301 __le32 i_atime; /* Access time */ 302 __le32 i_ctime; /* Creation time */ 303 __le32 i_mtime; /* Modification time */ 304 __le32 i_dtime; /* Deletion Time */ 305 __le16 i_gid; /* Low 16 bits of Group Id */ 306 __le16 i_links_count; /* Links count */ 307 __le32 i_blocks; /* Blocks count */ 308 __le32 i_flags; /* File flags */ 309 union { 310 struct { 311 __le32 l_i_reserved1; 312 } linux1; 313 struct { 314 __le32 h_i_translator; 315 } hurd1; 316 struct { 317 __le32 m_i_reserved1; 318 } masix1; 319 } osd1; /* OS dependent 1 */ 320 __le32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 321 __le32 i_generation; /* File version (for NFS) */ 322 __le32 i_file_acl; /* File ACL */ 323 __le32 i_dir_acl; /* Directory ACL */ 324 __le32 i_faddr; /* Fragment address */ 325 union { 326 struct { 327 __u8 l_i_frag; /* Fragment number */ 328 __u8 l_i_fsize; /* Fragment size */ 329 __u16 i_pad1; 330 __le16 l_i_uid_high; /* these 2 fields */ 331 __le16 l_i_gid_high; /* were reserved2[0] */ 332 __u32 l_i_reserved2; 333 } linux2; 334 struct { 335 __u8 h_i_frag; /* Fragment number */ 336 __u8 h_i_fsize; /* Fragment size */ 337 __le16 h_i_mode_high; 338 __le16 h_i_uid_high; 339 __le16 h_i_gid_high; 340 __le32 h_i_author; 341 } hurd2; 342 struct { 343 __u8 m_i_frag; /* Fragment number */ 344 __u8 m_i_fsize; /* Fragment size */ 345 __u16 m_pad1; 346 __u32 m_i_reserved2[2]; 347 } masix2; 348 } osd2; /* OS dependent 2 */ 349 }; 350 351 #define i_size_high i_dir_acl 352 353 #define i_reserved1 osd1.linux1.l_i_reserved1 354 #define i_frag osd2.linux2.l_i_frag 355 #define i_fsize osd2.linux2.l_i_fsize 356 #define i_uid_low i_uid 357 #define i_gid_low i_gid 358 #define i_uid_high osd2.linux2.l_i_uid_high 359 #define i_gid_high osd2.linux2.l_i_gid_high 360 #define i_reserved2 osd2.linux2.l_i_reserved2 361 362 /* 363 * File system states 364 */ 365 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 366 #define EXT2_ERROR_FS 0x0002 /* Errors detected */ 367 368 /* 369 * Mount flags 370 */ 371 #define EXT2_MOUNT_CHECK 0x000001 /* Do mount-time checks */ 372 #define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */ 373 #define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */ 374 #define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */ 375 #define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */ 376 #define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */ 377 #define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */ 378 #define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */ 379 #define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */ 380 #define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */ 381 #define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */ 382 #define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */ 383 #define EXT2_MOUNT_XIP 0x010000 /* Obsolete, use DAX */ 384 #define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */ 385 #define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */ 386 #define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */ 387 #ifdef CONFIG_FS_DAX 388 #define EXT2_MOUNT_DAX 0x100000 /* Direct Access */ 389 #else 390 #define EXT2_MOUNT_DAX 0 391 #endif 392 393 394 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 395 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt 396 #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 397 EXT2_MOUNT_##opt) 398 /* 399 * Maximal mount counts between two filesystem checks 400 */ 401 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 402 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 403 404 /* 405 * Behaviour when detecting errors 406 */ 407 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 408 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 409 #define EXT2_ERRORS_PANIC 3 /* Panic */ 410 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 411 412 /* 413 * Structure of the super block 414 */ 415 struct ext2_super_block { 416 __le32 s_inodes_count; /* Inodes count */ 417 __le32 s_blocks_count; /* Blocks count */ 418 __le32 s_r_blocks_count; /* Reserved blocks count */ 419 __le32 s_free_blocks_count; /* Free blocks count */ 420 __le32 s_free_inodes_count; /* Free inodes count */ 421 __le32 s_first_data_block; /* First Data Block */ 422 __le32 s_log_block_size; /* Block size */ 423 __le32 s_log_frag_size; /* Fragment size */ 424 __le32 s_blocks_per_group; /* # Blocks per group */ 425 __le32 s_frags_per_group; /* # Fragments per group */ 426 __le32 s_inodes_per_group; /* # Inodes per group */ 427 __le32 s_mtime; /* Mount time */ 428 __le32 s_wtime; /* Write time */ 429 __le16 s_mnt_count; /* Mount count */ 430 __le16 s_max_mnt_count; /* Maximal mount count */ 431 __le16 s_magic; /* Magic signature */ 432 __le16 s_state; /* File system state */ 433 __le16 s_errors; /* Behaviour when detecting errors */ 434 __le16 s_minor_rev_level; /* minor revision level */ 435 __le32 s_lastcheck; /* time of last check */ 436 __le32 s_checkinterval; /* max. time between checks */ 437 __le32 s_creator_os; /* OS */ 438 __le32 s_rev_level; /* Revision level */ 439 __le16 s_def_resuid; /* Default uid for reserved blocks */ 440 __le16 s_def_resgid; /* Default gid for reserved blocks */ 441 /* 442 * These fields are for EXT2_DYNAMIC_REV superblocks only. 443 * 444 * Note: the difference between the compatible feature set and 445 * the incompatible feature set is that if there is a bit set 446 * in the incompatible feature set that the kernel doesn't 447 * know about, it should refuse to mount the filesystem. 448 * 449 * e2fsck's requirements are more strict; if it doesn't know 450 * about a feature in either the compatible or incompatible 451 * feature set, it must abort and not try to meddle with 452 * things it doesn't understand... 453 */ 454 __le32 s_first_ino; /* First non-reserved inode */ 455 __le16 s_inode_size; /* size of inode structure */ 456 __le16 s_block_group_nr; /* block group # of this superblock */ 457 __le32 s_feature_compat; /* compatible feature set */ 458 __le32 s_feature_incompat; /* incompatible feature set */ 459 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 460 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 461 char s_volume_name[16]; /* volume name */ 462 char s_last_mounted[64]; /* directory where last mounted */ 463 __le32 s_algorithm_usage_bitmap; /* For compression */ 464 /* 465 * Performance hints. Directory preallocation should only 466 * happen if the EXT2_COMPAT_PREALLOC flag is on. 467 */ 468 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 469 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 470 __u16 s_padding1; 471 /* 472 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set. 473 */ 474 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 475 __u32 s_journal_inum; /* inode number of journal file */ 476 __u32 s_journal_dev; /* device number of journal file */ 477 __u32 s_last_orphan; /* start of list of inodes to delete */ 478 __u32 s_hash_seed[4]; /* HTREE hash seed */ 479 __u8 s_def_hash_version; /* Default hash version to use */ 480 __u8 s_reserved_char_pad; 481 __u16 s_reserved_word_pad; 482 __le32 s_default_mount_opts; 483 __le32 s_first_meta_bg; /* First metablock block group */ 484 __u32 s_reserved[190]; /* Padding to the end of the block */ 485 }; 486 487 /* 488 * Codes for operating systems 489 */ 490 #define EXT2_OS_LINUX 0 491 #define EXT2_OS_HURD 1 492 #define EXT2_OS_MASIX 2 493 #define EXT2_OS_FREEBSD 3 494 #define EXT2_OS_LITES 4 495 496 /* 497 * Revision levels 498 */ 499 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 500 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 501 502 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 503 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 504 505 #define EXT2_GOOD_OLD_INODE_SIZE 128 506 507 /* 508 * Feature set definitions 509 */ 510 511 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 512 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) 513 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 514 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) 515 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 516 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) 517 #define EXT2_SET_COMPAT_FEATURE(sb,mask) \ 518 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 519 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \ 520 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 521 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \ 522 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 523 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \ 524 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 525 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 526 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 527 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 528 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 529 530 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 531 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 532 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 533 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 534 #define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010 535 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 536 #define EXT2_FEATURE_COMPAT_ANY 0xffffffff 537 538 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 539 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 540 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 541 #define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff 542 543 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 544 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 545 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 546 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 547 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 548 #define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff 549 550 #define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 551 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ 552 EXT2_FEATURE_INCOMPAT_META_BG) 553 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 554 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 555 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 556 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP 557 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP 558 559 /* 560 * Default values for user and/or group using reserved blocks 561 */ 562 #define EXT2_DEF_RESUID 0 563 #define EXT2_DEF_RESGID 0 564 565 /* 566 * Default mount options 567 */ 568 #define EXT2_DEFM_DEBUG 0x0001 569 #define EXT2_DEFM_BSDGROUPS 0x0002 570 #define EXT2_DEFM_XATTR_USER 0x0004 571 #define EXT2_DEFM_ACL 0x0008 572 #define EXT2_DEFM_UID16 0x0010 573 /* Not used by ext2, but reserved for use by ext3 */ 574 #define EXT3_DEFM_JMODE 0x0060 575 #define EXT3_DEFM_JMODE_DATA 0x0020 576 #define EXT3_DEFM_JMODE_ORDERED 0x0040 577 #define EXT3_DEFM_JMODE_WBACK 0x0060 578 579 /* 580 * Structure of a directory entry 581 */ 582 583 struct ext2_dir_entry { 584 __le32 inode; /* Inode number */ 585 __le16 rec_len; /* Directory entry length */ 586 __le16 name_len; /* Name length */ 587 char name[]; /* File name, up to EXT2_NAME_LEN */ 588 }; 589 590 /* 591 * The new version of the directory entry. Since EXT2 structures are 592 * stored in intel byte order, and the name_len field could never be 593 * bigger than 255 chars, it's safe to reclaim the extra byte for the 594 * file_type field. 595 */ 596 struct ext2_dir_entry_2 { 597 __le32 inode; /* Inode number */ 598 __le16 rec_len; /* Directory entry length */ 599 __u8 name_len; /* Name length */ 600 __u8 file_type; 601 char name[]; /* File name, up to EXT2_NAME_LEN */ 602 }; 603 604 /* 605 * Ext2 directory file types. Only the low 3 bits are used. The 606 * other bits are reserved for now. 607 */ 608 enum { 609 EXT2_FT_UNKNOWN = 0, 610 EXT2_FT_REG_FILE = 1, 611 EXT2_FT_DIR = 2, 612 EXT2_FT_CHRDEV = 3, 613 EXT2_FT_BLKDEV = 4, 614 EXT2_FT_FIFO = 5, 615 EXT2_FT_SOCK = 6, 616 EXT2_FT_SYMLINK = 7, 617 EXT2_FT_MAX 618 }; 619 620 /* 621 * EXT2_DIR_PAD defines the directory entries boundaries 622 * 623 * NOTE: It must be a multiple of 4 624 */ 625 #define EXT2_DIR_PAD 4 626 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 627 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 628 ~EXT2_DIR_ROUND) 629 #define EXT2_MAX_REC_LEN ((1<<16)-1) 630 631 static inline void verify_offsets(void) 632 { 633 #define A(x,y) BUILD_BUG_ON(x != offsetof(struct ext2_super_block, y)); 634 A(EXT2_SB_MAGIC_OFFSET, s_magic); 635 A(EXT2_SB_BLOCKS_OFFSET, s_blocks_count); 636 A(EXT2_SB_BSIZE_OFFSET, s_log_block_size); 637 #undef A 638 } 639 640 /* 641 * ext2 mount options 642 */ 643 struct ext2_mount_options { 644 unsigned long s_mount_opt; 645 kuid_t s_resuid; 646 kgid_t s_resgid; 647 }; 648 649 /* 650 * second extended file system inode data in memory 651 */ 652 struct ext2_inode_info { 653 __le32 i_data[15]; 654 __u32 i_flags; 655 __u32 i_faddr; 656 __u8 i_frag_no; 657 __u8 i_frag_size; 658 __u16 i_state; 659 __u32 i_file_acl; 660 __u32 i_dir_acl; 661 __u32 i_dtime; 662 663 /* 664 * i_block_group is the number of the block group which contains 665 * this file's inode. Constant across the lifetime of the inode, 666 * it is used for making block allocation decisions - we try to 667 * place a file's data blocks near its inode block, and new inodes 668 * near to their parent directory's inode. 669 */ 670 __u32 i_block_group; 671 672 /* block reservation info */ 673 struct ext2_block_alloc_info *i_block_alloc_info; 674 675 __u32 i_dir_start_lookup; 676 #ifdef CONFIG_EXT2_FS_XATTR 677 /* 678 * Extended attributes can be read independently of the main file 679 * data. Taking i_mutex even when reading would cause contention 680 * between readers of EAs and writers of regular file data, so 681 * instead we synchronize on xattr_sem when reading or changing 682 * EAs. 683 */ 684 struct rw_semaphore xattr_sem; 685 #endif 686 rwlock_t i_meta_lock; 687 688 /* 689 * truncate_mutex is for serialising ext2_truncate() against 690 * ext2_getblock(). It also protects the internals of the inode's 691 * reservation data structures: ext2_reserve_window and 692 * ext2_reserve_window_node. 693 */ 694 struct mutex truncate_mutex; 695 struct inode vfs_inode; 696 struct list_head i_orphan; /* unlinked but open inodes */ 697 #ifdef CONFIG_QUOTA 698 struct dquot *i_dquot[MAXQUOTAS]; 699 #endif 700 }; 701 702 /* 703 * Inode dynamic state flags 704 */ 705 #define EXT2_STATE_NEW 0x00000001 /* inode is newly created */ 706 707 708 /* 709 * Function prototypes 710 */ 711 712 /* 713 * Ok, these declarations are also in <linux/kernel.h> but none of the 714 * ext2 source programs needs to include it so they are duplicated here. 715 */ 716 717 static inline struct ext2_inode_info *EXT2_I(struct inode *inode) 718 { 719 return container_of(inode, struct ext2_inode_info, vfs_inode); 720 } 721 722 /* balloc.c */ 723 extern int ext2_bg_has_super(struct super_block *sb, int group); 724 extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group); 725 extern ext2_fsblk_t ext2_new_block(struct inode *, unsigned long, int *); 726 extern ext2_fsblk_t ext2_new_blocks(struct inode *, unsigned long, 727 unsigned long *, int *); 728 extern void ext2_free_blocks (struct inode *, unsigned long, 729 unsigned long); 730 extern unsigned long ext2_count_free_blocks (struct super_block *); 731 extern unsigned long ext2_count_dirs (struct super_block *); 732 extern void ext2_check_blocks_bitmap (struct super_block *); 733 extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb, 734 unsigned int block_group, 735 struct buffer_head ** bh); 736 extern void ext2_discard_reservation (struct inode *); 737 extern int ext2_should_retry_alloc(struct super_block *sb, int *retries); 738 extern void ext2_init_block_alloc_info(struct inode *); 739 extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_window_node *rsv); 740 741 /* dir.c */ 742 extern int ext2_add_link (struct dentry *, struct inode *); 743 extern ino_t ext2_inode_by_name(struct inode *, struct qstr *); 744 extern int ext2_make_empty(struct inode *, struct inode *); 745 extern struct ext2_dir_entry_2 * ext2_find_entry (struct inode *,struct qstr *, struct page **); 746 extern int ext2_delete_entry (struct ext2_dir_entry_2 *, struct page *); 747 extern int ext2_empty_dir (struct inode *); 748 extern struct ext2_dir_entry_2 * ext2_dotdot (struct inode *, struct page **); 749 extern void ext2_set_link(struct inode *, struct ext2_dir_entry_2 *, struct page *, struct inode *, int); 750 751 /* ialloc.c */ 752 extern struct inode * ext2_new_inode (struct inode *, umode_t, const struct qstr *); 753 extern void ext2_free_inode (struct inode *); 754 extern unsigned long ext2_count_free_inodes (struct super_block *); 755 extern void ext2_check_inodes_bitmap (struct super_block *); 756 extern unsigned long ext2_count_free (struct buffer_head *, unsigned); 757 758 /* inode.c */ 759 extern struct inode *ext2_iget (struct super_block *, unsigned long); 760 extern int ext2_write_inode (struct inode *, struct writeback_control *); 761 extern void ext2_evict_inode(struct inode *); 762 extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int); 763 extern int ext2_setattr (struct dentry *, struct iattr *); 764 extern void ext2_set_inode_flags(struct inode *inode); 765 extern void ext2_get_inode_flags(struct ext2_inode_info *); 766 extern int ext2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 767 u64 start, u64 len); 768 769 /* ioctl.c */ 770 extern long ext2_ioctl(struct file *, unsigned int, unsigned long); 771 extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long); 772 773 /* namei.c */ 774 struct dentry *ext2_get_parent(struct dentry *child); 775 776 /* super.c */ 777 extern __printf(3, 4) 778 void ext2_error(struct super_block *, const char *, const char *, ...); 779 extern __printf(3, 4) 780 void ext2_msg(struct super_block *, const char *, const char *, ...); 781 extern void ext2_update_dynamic_rev (struct super_block *sb); 782 extern void ext2_write_super (struct super_block *); 783 784 /* 785 * Inodes and files operations 786 */ 787 788 /* dir.c */ 789 extern const struct file_operations ext2_dir_operations; 790 791 /* file.c */ 792 extern int ext2_fsync(struct file *file, loff_t start, loff_t end, 793 int datasync); 794 extern const struct inode_operations ext2_file_inode_operations; 795 extern const struct file_operations ext2_file_operations; 796 extern const struct file_operations ext2_dax_file_operations; 797 798 /* inode.c */ 799 extern const struct address_space_operations ext2_aops; 800 extern const struct address_space_operations ext2_nobh_aops; 801 802 /* namei.c */ 803 extern const struct inode_operations ext2_dir_inode_operations; 804 extern const struct inode_operations ext2_special_inode_operations; 805 806 /* symlink.c */ 807 extern const struct inode_operations ext2_fast_symlink_inode_operations; 808 extern const struct inode_operations ext2_symlink_inode_operations; 809 810 static inline ext2_fsblk_t 811 ext2_group_first_block_no(struct super_block *sb, unsigned long group_no) 812 { 813 return group_no * (ext2_fsblk_t)EXT2_BLOCKS_PER_GROUP(sb) + 814 le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block); 815 } 816 817 #define ext2_set_bit __test_and_set_bit_le 818 #define ext2_clear_bit __test_and_clear_bit_le 819 #define ext2_test_bit test_bit_le 820 #define ext2_find_first_zero_bit find_first_zero_bit_le 821 #define ext2_find_next_zero_bit find_next_zero_bit_le 822