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 struct mb_cache; 65 66 /* 67 * second extended-fs super-block data in memory 68 */ 69 struct ext2_sb_info { 70 unsigned long s_frag_size; /* Size of a fragment in bytes */ 71 unsigned long s_frags_per_block;/* Number of fragments per block */ 72 unsigned long s_inodes_per_block;/* Number of inodes per block */ 73 unsigned long s_frags_per_group;/* Number of fragments in a group */ 74 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 75 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 76 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 77 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 78 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 79 unsigned long s_groups_count; /* Number of groups in the fs */ 80 unsigned long s_overhead_last; /* Last calculated overhead */ 81 unsigned long s_blocks_last; /* Last seen block count */ 82 struct buffer_head * s_sbh; /* Buffer containing the super block */ 83 struct ext2_super_block * s_es; /* Pointer to the super block in the buffer */ 84 struct buffer_head ** s_group_desc; 85 unsigned long s_mount_opt; 86 unsigned long s_sb_block; 87 kuid_t s_resuid; 88 kgid_t s_resgid; 89 unsigned short s_mount_state; 90 unsigned short s_pad; 91 int s_addr_per_block_bits; 92 int s_desc_per_block_bits; 93 int s_inode_size; 94 int s_first_ino; 95 spinlock_t s_next_gen_lock; 96 u32 s_next_generation; 97 unsigned long s_dir_count; 98 u8 *s_debts; 99 struct percpu_counter s_freeblocks_counter; 100 struct percpu_counter s_freeinodes_counter; 101 struct percpu_counter s_dirs_counter; 102 struct blockgroup_lock *s_blockgroup_lock; 103 /* root of the per fs reservation window tree */ 104 spinlock_t s_rsv_window_lock; 105 struct rb_root s_rsv_window_root; 106 struct ext2_reserve_window_node s_rsv_window_head; 107 /* 108 * s_lock protects against concurrent modifications of s_mount_state, 109 * s_blocks_last, s_overhead_last and the content of superblock's 110 * buffer pointed to by sbi->s_es. 111 * 112 * Note: It is used in ext2_show_options() to provide a consistent view 113 * of the mount options. 114 */ 115 spinlock_t s_lock; 116 struct mb_cache *s_mb_cache; 117 }; 118 119 static inline spinlock_t * 120 sb_bgl_lock(struct ext2_sb_info *sbi, unsigned int block_group) 121 { 122 return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group); 123 } 124 125 /* 126 * Define EXT2FS_DEBUG to produce debug messages 127 */ 128 #undef EXT2FS_DEBUG 129 130 /* 131 * Define EXT2_RESERVATION to reserve data blocks for expanding files 132 */ 133 #define EXT2_DEFAULT_RESERVE_BLOCKS 8 134 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */ 135 #define EXT2_MAX_RESERVE_BLOCKS 1027 136 #define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0 137 /* 138 * The second extended file system version 139 */ 140 #define EXT2FS_DATE "95/08/09" 141 #define EXT2FS_VERSION "0.5b" 142 143 /* 144 * Debug code 145 */ 146 #ifdef EXT2FS_DEBUG 147 # define ext2_debug(f, a...) { \ 148 printk ("EXT2-fs DEBUG (%s, %d): %s:", \ 149 __FILE__, __LINE__, __func__); \ 150 printk (f, ## a); \ 151 } 152 #else 153 # define ext2_debug(f, a...) /**/ 154 #endif 155 156 /* 157 * Special inode numbers 158 */ 159 #define EXT2_BAD_INO 1 /* Bad blocks inode */ 160 #define EXT2_ROOT_INO 2 /* Root inode */ 161 #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ 162 #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ 163 164 /* First non-reserved inode for old ext2 filesystems */ 165 #define EXT2_GOOD_OLD_FIRST_INO 11 166 167 static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb) 168 { 169 return sb->s_fs_info; 170 } 171 172 /* 173 * Macro-instructions used to manage several block sizes 174 */ 175 #define EXT2_MIN_BLOCK_SIZE 1024 176 #define EXT2_MAX_BLOCK_SIZE 4096 177 #define EXT2_MIN_BLOCK_LOG_SIZE 10 178 #define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) 179 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32)) 180 #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 181 #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits) 182 #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size) 183 #define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino) 184 185 /* 186 * Macro-instructions used to manage fragments 187 */ 188 #define EXT2_MIN_FRAG_SIZE 1024 189 #define EXT2_MAX_FRAG_SIZE 4096 190 #define EXT2_MIN_FRAG_LOG_SIZE 10 191 #define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->s_frag_size) 192 #define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->s_frags_per_block) 193 194 /* 195 * Structure of a blocks group descriptor 196 */ 197 struct ext2_group_desc 198 { 199 __le32 bg_block_bitmap; /* Blocks bitmap block */ 200 __le32 bg_inode_bitmap; /* Inodes bitmap block */ 201 __le32 bg_inode_table; /* Inodes table block */ 202 __le16 bg_free_blocks_count; /* Free blocks count */ 203 __le16 bg_free_inodes_count; /* Free inodes count */ 204 __le16 bg_used_dirs_count; /* Directories count */ 205 __le16 bg_pad; 206 __le32 bg_reserved[3]; 207 }; 208 209 /* 210 * Macro-instructions used to manage group descriptors 211 */ 212 #define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 213 #define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) 214 #define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 215 #define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 216 217 /* 218 * Constants relative to the data blocks 219 */ 220 #define EXT2_NDIR_BLOCKS 12 221 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 222 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 223 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 224 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 225 226 /* 227 * Inode flags (GETFLAGS/SETFLAGS) 228 */ 229 #define EXT2_SECRM_FL FS_SECRM_FL /* Secure deletion */ 230 #define EXT2_UNRM_FL FS_UNRM_FL /* Undelete */ 231 #define EXT2_COMPR_FL FS_COMPR_FL /* Compress file */ 232 #define EXT2_SYNC_FL FS_SYNC_FL /* Synchronous updates */ 233 #define EXT2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */ 234 #define EXT2_APPEND_FL FS_APPEND_FL /* writes to file may only append */ 235 #define EXT2_NODUMP_FL FS_NODUMP_FL /* do not dump file */ 236 #define EXT2_NOATIME_FL FS_NOATIME_FL /* do not update atime */ 237 /* Reserved for compression usage... */ 238 #define EXT2_DIRTY_FL FS_DIRTY_FL 239 #define EXT2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */ 240 #define EXT2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */ 241 #define EXT2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */ 242 /* End compression flags --- maybe not all used */ 243 #define EXT2_BTREE_FL FS_BTREE_FL /* btree format dir */ 244 #define EXT2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */ 245 #define EXT2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */ 246 #define EXT2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */ 247 #define EXT2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */ 248 #define EXT2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */ 249 #define EXT2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/ 250 #define EXT2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */ 251 252 #define EXT2_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */ 253 #define EXT2_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */ 254 255 /* Flags that should be inherited by new inodes from their parent. */ 256 #define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\ 257 EXT2_SYNC_FL | EXT2_NODUMP_FL |\ 258 EXT2_NOATIME_FL | EXT2_COMPRBLK_FL |\ 259 EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\ 260 EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL) 261 262 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 263 #define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL)) 264 265 /* Flags that are appropriate for non-directories/regular files. */ 266 #define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL) 267 268 /* Mask out flags that are inappropriate for the given type of inode. */ 269 static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags) 270 { 271 if (S_ISDIR(mode)) 272 return flags; 273 else if (S_ISREG(mode)) 274 return flags & EXT2_REG_FLMASK; 275 else 276 return flags & EXT2_OTHER_FLMASK; 277 } 278 279 /* 280 * ioctl commands 281 */ 282 #define EXT2_IOC_GETFLAGS FS_IOC_GETFLAGS 283 #define EXT2_IOC_SETFLAGS FS_IOC_SETFLAGS 284 #define EXT2_IOC_GETVERSION FS_IOC_GETVERSION 285 #define EXT2_IOC_SETVERSION FS_IOC_SETVERSION 286 #define EXT2_IOC_GETRSVSZ _IOR('f', 5, long) 287 #define EXT2_IOC_SETRSVSZ _IOW('f', 6, long) 288 289 /* 290 * ioctl commands in 32 bit emulation 291 */ 292 #define EXT2_IOC32_GETFLAGS FS_IOC32_GETFLAGS 293 #define EXT2_IOC32_SETFLAGS FS_IOC32_SETFLAGS 294 #define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION 295 #define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION 296 297 /* 298 * Structure of an inode on the disk 299 */ 300 struct ext2_inode { 301 __le16 i_mode; /* File mode */ 302 __le16 i_uid; /* Low 16 bits of Owner Uid */ 303 __le32 i_size; /* Size in bytes */ 304 __le32 i_atime; /* Access time */ 305 __le32 i_ctime; /* Creation time */ 306 __le32 i_mtime; /* Modification time */ 307 __le32 i_dtime; /* Deletion Time */ 308 __le16 i_gid; /* Low 16 bits of Group Id */ 309 __le16 i_links_count; /* Links count */ 310 __le32 i_blocks; /* Blocks count */ 311 __le32 i_flags; /* File flags */ 312 union { 313 struct { 314 __le32 l_i_reserved1; 315 } linux1; 316 struct { 317 __le32 h_i_translator; 318 } hurd1; 319 struct { 320 __le32 m_i_reserved1; 321 } masix1; 322 } osd1; /* OS dependent 1 */ 323 __le32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 324 __le32 i_generation; /* File version (for NFS) */ 325 __le32 i_file_acl; /* File ACL */ 326 __le32 i_dir_acl; /* Directory ACL */ 327 __le32 i_faddr; /* Fragment address */ 328 union { 329 struct { 330 __u8 l_i_frag; /* Fragment number */ 331 __u8 l_i_fsize; /* Fragment size */ 332 __u16 i_pad1; 333 __le16 l_i_uid_high; /* these 2 fields */ 334 __le16 l_i_gid_high; /* were reserved2[0] */ 335 __u32 l_i_reserved2; 336 } linux2; 337 struct { 338 __u8 h_i_frag; /* Fragment number */ 339 __u8 h_i_fsize; /* Fragment size */ 340 __le16 h_i_mode_high; 341 __le16 h_i_uid_high; 342 __le16 h_i_gid_high; 343 __le32 h_i_author; 344 } hurd2; 345 struct { 346 __u8 m_i_frag; /* Fragment number */ 347 __u8 m_i_fsize; /* Fragment size */ 348 __u16 m_pad1; 349 __u32 m_i_reserved2[2]; 350 } masix2; 351 } osd2; /* OS dependent 2 */ 352 }; 353 354 #define i_size_high i_dir_acl 355 356 #define i_reserved1 osd1.linux1.l_i_reserved1 357 #define i_frag osd2.linux2.l_i_frag 358 #define i_fsize osd2.linux2.l_i_fsize 359 #define i_uid_low i_uid 360 #define i_gid_low i_gid 361 #define i_uid_high osd2.linux2.l_i_uid_high 362 #define i_gid_high osd2.linux2.l_i_gid_high 363 #define i_reserved2 osd2.linux2.l_i_reserved2 364 365 /* 366 * File system states 367 */ 368 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 369 #define EXT2_ERROR_FS 0x0002 /* Errors detected */ 370 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 371 372 /* 373 * Mount flags 374 */ 375 #define EXT2_MOUNT_CHECK 0x000001 /* Do mount-time checks */ 376 #define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */ 377 #define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */ 378 #define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */ 379 #define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */ 380 #define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */ 381 #define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */ 382 #define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */ 383 #define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */ 384 #define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */ 385 #define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */ 386 #define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */ 387 #define EXT2_MOUNT_XIP 0x010000 /* Obsolete, use DAX */ 388 #define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */ 389 #define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */ 390 #define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */ 391 #ifdef CONFIG_FS_DAX 392 #define EXT2_MOUNT_DAX 0x100000 /* Direct Access */ 393 #else 394 #define EXT2_MOUNT_DAX 0 395 #endif 396 397 398 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 399 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt 400 #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 401 EXT2_MOUNT_##opt) 402 /* 403 * Maximal mount counts between two filesystem checks 404 */ 405 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 406 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 407 408 /* 409 * Behaviour when detecting errors 410 */ 411 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 412 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 413 #define EXT2_ERRORS_PANIC 3 /* Panic */ 414 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 415 416 /* 417 * Structure of the super block 418 */ 419 struct ext2_super_block { 420 __le32 s_inodes_count; /* Inodes count */ 421 __le32 s_blocks_count; /* Blocks count */ 422 __le32 s_r_blocks_count; /* Reserved blocks count */ 423 __le32 s_free_blocks_count; /* Free blocks count */ 424 __le32 s_free_inodes_count; /* Free inodes count */ 425 __le32 s_first_data_block; /* First Data Block */ 426 __le32 s_log_block_size; /* Block size */ 427 __le32 s_log_frag_size; /* Fragment size */ 428 __le32 s_blocks_per_group; /* # Blocks per group */ 429 __le32 s_frags_per_group; /* # Fragments per group */ 430 __le32 s_inodes_per_group; /* # Inodes per group */ 431 __le32 s_mtime; /* Mount time */ 432 __le32 s_wtime; /* Write time */ 433 __le16 s_mnt_count; /* Mount count */ 434 __le16 s_max_mnt_count; /* Maximal mount count */ 435 __le16 s_magic; /* Magic signature */ 436 __le16 s_state; /* File system state */ 437 __le16 s_errors; /* Behaviour when detecting errors */ 438 __le16 s_minor_rev_level; /* minor revision level */ 439 __le32 s_lastcheck; /* time of last check */ 440 __le32 s_checkinterval; /* max. time between checks */ 441 __le32 s_creator_os; /* OS */ 442 __le32 s_rev_level; /* Revision level */ 443 __le16 s_def_resuid; /* Default uid for reserved blocks */ 444 __le16 s_def_resgid; /* Default gid for reserved blocks */ 445 /* 446 * These fields are for EXT2_DYNAMIC_REV superblocks only. 447 * 448 * Note: the difference between the compatible feature set and 449 * the incompatible feature set is that if there is a bit set 450 * in the incompatible feature set that the kernel doesn't 451 * know about, it should refuse to mount the filesystem. 452 * 453 * e2fsck's requirements are more strict; if it doesn't know 454 * about a feature in either the compatible or incompatible 455 * feature set, it must abort and not try to meddle with 456 * things it doesn't understand... 457 */ 458 __le32 s_first_ino; /* First non-reserved inode */ 459 __le16 s_inode_size; /* size of inode structure */ 460 __le16 s_block_group_nr; /* block group # of this superblock */ 461 __le32 s_feature_compat; /* compatible feature set */ 462 __le32 s_feature_incompat; /* incompatible feature set */ 463 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 464 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 465 char s_volume_name[16]; /* volume name */ 466 char s_last_mounted[64]; /* directory where last mounted */ 467 __le32 s_algorithm_usage_bitmap; /* For compression */ 468 /* 469 * Performance hints. Directory preallocation should only 470 * happen if the EXT2_COMPAT_PREALLOC flag is on. 471 */ 472 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 473 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 474 __u16 s_padding1; 475 /* 476 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set. 477 */ 478 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 479 __u32 s_journal_inum; /* inode number of journal file */ 480 __u32 s_journal_dev; /* device number of journal file */ 481 __u32 s_last_orphan; /* start of list of inodes to delete */ 482 __u32 s_hash_seed[4]; /* HTREE hash seed */ 483 __u8 s_def_hash_version; /* Default hash version to use */ 484 __u8 s_reserved_char_pad; 485 __u16 s_reserved_word_pad; 486 __le32 s_default_mount_opts; 487 __le32 s_first_meta_bg; /* First metablock block group */ 488 __u32 s_reserved[190]; /* Padding to the end of the block */ 489 }; 490 491 /* 492 * Codes for operating systems 493 */ 494 #define EXT2_OS_LINUX 0 495 #define EXT2_OS_HURD 1 496 #define EXT2_OS_MASIX 2 497 #define EXT2_OS_FREEBSD 3 498 #define EXT2_OS_LITES 4 499 500 /* 501 * Revision levels 502 */ 503 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 504 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 505 506 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 507 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 508 509 #define EXT2_GOOD_OLD_INODE_SIZE 128 510 511 /* 512 * Feature set definitions 513 */ 514 515 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 516 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) 517 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 518 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) 519 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 520 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) 521 #define EXT2_SET_COMPAT_FEATURE(sb,mask) \ 522 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 523 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \ 524 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 525 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \ 526 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 527 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \ 528 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 529 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 530 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 531 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 532 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 533 534 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 535 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 536 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 537 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 538 #define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010 539 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 540 #define EXT2_FEATURE_COMPAT_ANY 0xffffffff 541 542 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 543 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 544 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 545 #define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff 546 547 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 548 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 549 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 550 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 551 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 552 #define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff 553 554 #define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 555 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ 556 EXT2_FEATURE_INCOMPAT_META_BG) 557 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 558 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 559 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 560 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP 561 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP 562 563 /* 564 * Default values for user and/or group using reserved blocks 565 */ 566 #define EXT2_DEF_RESUID 0 567 #define EXT2_DEF_RESGID 0 568 569 /* 570 * Default mount options 571 */ 572 #define EXT2_DEFM_DEBUG 0x0001 573 #define EXT2_DEFM_BSDGROUPS 0x0002 574 #define EXT2_DEFM_XATTR_USER 0x0004 575 #define EXT2_DEFM_ACL 0x0008 576 #define EXT2_DEFM_UID16 0x0010 577 /* Not used by ext2, but reserved for use by ext3 */ 578 #define EXT3_DEFM_JMODE 0x0060 579 #define EXT3_DEFM_JMODE_DATA 0x0020 580 #define EXT3_DEFM_JMODE_ORDERED 0x0040 581 #define EXT3_DEFM_JMODE_WBACK 0x0060 582 583 /* 584 * Structure of a directory entry 585 */ 586 587 struct ext2_dir_entry { 588 __le32 inode; /* Inode number */ 589 __le16 rec_len; /* Directory entry length */ 590 __le16 name_len; /* Name length */ 591 char name[]; /* File name, up to EXT2_NAME_LEN */ 592 }; 593 594 /* 595 * The new version of the directory entry. Since EXT2 structures are 596 * stored in intel byte order, and the name_len field could never be 597 * bigger than 255 chars, it's safe to reclaim the extra byte for the 598 * file_type field. 599 */ 600 struct ext2_dir_entry_2 { 601 __le32 inode; /* Inode number */ 602 __le16 rec_len; /* Directory entry length */ 603 __u8 name_len; /* Name length */ 604 __u8 file_type; 605 char name[]; /* File name, up to EXT2_NAME_LEN */ 606 }; 607 608 /* 609 * Ext2 directory file types. Only the low 3 bits are used. The 610 * other bits are reserved for now. 611 */ 612 enum { 613 EXT2_FT_UNKNOWN = 0, 614 EXT2_FT_REG_FILE = 1, 615 EXT2_FT_DIR = 2, 616 EXT2_FT_CHRDEV = 3, 617 EXT2_FT_BLKDEV = 4, 618 EXT2_FT_FIFO = 5, 619 EXT2_FT_SOCK = 6, 620 EXT2_FT_SYMLINK = 7, 621 EXT2_FT_MAX 622 }; 623 624 /* 625 * EXT2_DIR_PAD defines the directory entries boundaries 626 * 627 * NOTE: It must be a multiple of 4 628 */ 629 #define EXT2_DIR_PAD 4 630 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 631 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 632 ~EXT2_DIR_ROUND) 633 #define EXT2_MAX_REC_LEN ((1<<16)-1) 634 635 static inline void verify_offsets(void) 636 { 637 #define A(x,y) BUILD_BUG_ON(x != offsetof(struct ext2_super_block, y)); 638 A(EXT2_SB_MAGIC_OFFSET, s_magic); 639 A(EXT2_SB_BLOCKS_OFFSET, s_blocks_count); 640 A(EXT2_SB_BSIZE_OFFSET, s_log_block_size); 641 #undef A 642 } 643 644 /* 645 * ext2 mount options 646 */ 647 struct ext2_mount_options { 648 unsigned long s_mount_opt; 649 kuid_t s_resuid; 650 kgid_t s_resgid; 651 }; 652 653 /* 654 * second extended file system inode data in memory 655 */ 656 struct ext2_inode_info { 657 __le32 i_data[15]; 658 __u32 i_flags; 659 __u32 i_faddr; 660 __u8 i_frag_no; 661 __u8 i_frag_size; 662 __u16 i_state; 663 __u32 i_file_acl; 664 __u32 i_dir_acl; 665 __u32 i_dtime; 666 667 /* 668 * i_block_group is the number of the block group which contains 669 * this file's inode. Constant across the lifetime of the inode, 670 * it is used for making block allocation decisions - we try to 671 * place a file's data blocks near its inode block, and new inodes 672 * near to their parent directory's inode. 673 */ 674 __u32 i_block_group; 675 676 /* block reservation info */ 677 struct ext2_block_alloc_info *i_block_alloc_info; 678 679 __u32 i_dir_start_lookup; 680 #ifdef CONFIG_EXT2_FS_XATTR 681 /* 682 * Extended attributes can be read independently of the main file 683 * data. Taking i_mutex even when reading would cause contention 684 * between readers of EAs and writers of regular file data, so 685 * instead we synchronize on xattr_sem when reading or changing 686 * EAs. 687 */ 688 struct rw_semaphore xattr_sem; 689 #endif 690 rwlock_t i_meta_lock; 691 #ifdef CONFIG_FS_DAX 692 struct rw_semaphore dax_sem; 693 #endif 694 695 /* 696 * truncate_mutex is for serialising ext2_truncate() against 697 * ext2_getblock(). It also protects the internals of the inode's 698 * reservation data structures: ext2_reserve_window and 699 * ext2_reserve_window_node. 700 */ 701 struct mutex truncate_mutex; 702 struct inode vfs_inode; 703 struct list_head i_orphan; /* unlinked but open inodes */ 704 #ifdef CONFIG_QUOTA 705 struct dquot *i_dquot[MAXQUOTAS]; 706 #endif 707 }; 708 709 #ifdef CONFIG_FS_DAX 710 #define dax_sem_down_write(ext2_inode) down_write(&(ext2_inode)->dax_sem) 711 #define dax_sem_up_write(ext2_inode) up_write(&(ext2_inode)->dax_sem) 712 #else 713 #define dax_sem_down_write(ext2_inode) 714 #define dax_sem_up_write(ext2_inode) 715 #endif 716 717 /* 718 * Inode dynamic state flags 719 */ 720 #define EXT2_STATE_NEW 0x00000001 /* inode is newly created */ 721 722 723 /* 724 * Function prototypes 725 */ 726 727 /* 728 * Ok, these declarations are also in <linux/kernel.h> but none of the 729 * ext2 source programs needs to include it so they are duplicated here. 730 */ 731 732 static inline struct ext2_inode_info *EXT2_I(struct inode *inode) 733 { 734 return container_of(inode, struct ext2_inode_info, vfs_inode); 735 } 736 737 /* balloc.c */ 738 extern int ext2_bg_has_super(struct super_block *sb, int group); 739 extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group); 740 extern ext2_fsblk_t ext2_new_block(struct inode *, unsigned long, int *); 741 extern ext2_fsblk_t ext2_new_blocks(struct inode *, unsigned long, 742 unsigned long *, int *); 743 extern int ext2_data_block_valid(struct ext2_sb_info *sbi, ext2_fsblk_t start_blk, 744 unsigned int count); 745 extern void ext2_free_blocks (struct inode *, unsigned long, 746 unsigned long); 747 extern unsigned long ext2_count_free_blocks (struct super_block *); 748 extern unsigned long ext2_count_dirs (struct super_block *); 749 extern void ext2_check_blocks_bitmap (struct super_block *); 750 extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb, 751 unsigned int block_group, 752 struct buffer_head ** bh); 753 extern void ext2_discard_reservation (struct inode *); 754 extern int ext2_should_retry_alloc(struct super_block *sb, int *retries); 755 extern void ext2_init_block_alloc_info(struct inode *); 756 extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_window_node *rsv); 757 758 /* dir.c */ 759 extern int ext2_add_link (struct dentry *, struct inode *); 760 extern ino_t ext2_inode_by_name(struct inode *, const struct qstr *); 761 extern int ext2_make_empty(struct inode *, struct inode *); 762 extern struct ext2_dir_entry_2 * ext2_find_entry (struct inode *,const struct qstr *, struct page **); 763 extern int ext2_delete_entry (struct ext2_dir_entry_2 *, struct page *); 764 extern int ext2_empty_dir (struct inode *); 765 extern struct ext2_dir_entry_2 * ext2_dotdot (struct inode *, struct page **); 766 extern void ext2_set_link(struct inode *, struct ext2_dir_entry_2 *, struct page *, struct inode *, int); 767 768 /* ialloc.c */ 769 extern struct inode * ext2_new_inode (struct inode *, umode_t, const struct qstr *); 770 extern void ext2_free_inode (struct inode *); 771 extern unsigned long ext2_count_free_inodes (struct super_block *); 772 extern void ext2_check_inodes_bitmap (struct super_block *); 773 extern unsigned long ext2_count_free (struct buffer_head *, unsigned); 774 775 /* inode.c */ 776 extern struct inode *ext2_iget (struct super_block *, unsigned long); 777 extern int ext2_write_inode (struct inode *, struct writeback_control *); 778 extern void ext2_evict_inode(struct inode *); 779 extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int); 780 extern int ext2_setattr (struct dentry *, struct iattr *); 781 extern void ext2_set_inode_flags(struct inode *inode); 782 extern int ext2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 783 u64 start, u64 len); 784 785 /* ioctl.c */ 786 extern long ext2_ioctl(struct file *, unsigned int, unsigned long); 787 extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long); 788 789 /* namei.c */ 790 struct dentry *ext2_get_parent(struct dentry *child); 791 792 /* super.c */ 793 extern __printf(3, 4) 794 void ext2_error(struct super_block *, const char *, const char *, ...); 795 extern __printf(3, 4) 796 void ext2_msg(struct super_block *, const char *, const char *, ...); 797 extern void ext2_update_dynamic_rev (struct super_block *sb); 798 extern void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, 799 int wait); 800 801 /* 802 * Inodes and files operations 803 */ 804 805 /* dir.c */ 806 extern const struct file_operations ext2_dir_operations; 807 808 /* file.c */ 809 extern int ext2_fsync(struct file *file, loff_t start, loff_t end, 810 int datasync); 811 extern const struct inode_operations ext2_file_inode_operations; 812 extern const struct file_operations ext2_file_operations; 813 814 /* inode.c */ 815 extern const struct address_space_operations ext2_aops; 816 extern const struct address_space_operations ext2_nobh_aops; 817 extern const struct iomap_ops ext2_iomap_ops; 818 819 /* namei.c */ 820 extern const struct inode_operations ext2_dir_inode_operations; 821 extern const struct inode_operations ext2_special_inode_operations; 822 823 /* symlink.c */ 824 extern const struct inode_operations ext2_fast_symlink_inode_operations; 825 extern const struct inode_operations ext2_symlink_inode_operations; 826 827 static inline ext2_fsblk_t 828 ext2_group_first_block_no(struct super_block *sb, unsigned long group_no) 829 { 830 return group_no * (ext2_fsblk_t)EXT2_BLOCKS_PER_GROUP(sb) + 831 le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block); 832 } 833 834 #define ext2_set_bit __test_and_set_bit_le 835 #define ext2_clear_bit __test_and_clear_bit_le 836 #define ext2_test_bit test_bit_le 837 #define ext2_find_first_zero_bit find_first_zero_bit_le 838 #define ext2_find_next_zero_bit find_next_zero_bit_le 839