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_ea_block_cache; 117 struct dax_device *s_daxdev; 118 }; 119 120 static inline spinlock_t * 121 sb_bgl_lock(struct ext2_sb_info *sbi, unsigned int block_group) 122 { 123 return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group); 124 } 125 126 /* 127 * Define EXT2FS_DEBUG to produce debug messages 128 */ 129 #undef EXT2FS_DEBUG 130 131 /* 132 * Define EXT2_RESERVATION to reserve data blocks for expanding files 133 */ 134 #define EXT2_DEFAULT_RESERVE_BLOCKS 8 135 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */ 136 #define EXT2_MAX_RESERVE_BLOCKS 1027 137 #define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0 138 /* 139 * The second extended file system version 140 */ 141 #define EXT2FS_DATE "95/08/09" 142 #define EXT2FS_VERSION "0.5b" 143 144 /* 145 * Debug code 146 */ 147 #ifdef EXT2FS_DEBUG 148 # define ext2_debug(f, a...) { \ 149 printk ("EXT2-fs DEBUG (%s, %d): %s:", \ 150 __FILE__, __LINE__, __func__); \ 151 printk (f, ## a); \ 152 } 153 #else 154 # define ext2_debug(f, a...) /**/ 155 #endif 156 157 /* 158 * Special inode numbers 159 */ 160 #define EXT2_BAD_INO 1 /* Bad blocks inode */ 161 #define EXT2_ROOT_INO 2 /* Root inode */ 162 #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ 163 #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ 164 165 /* First non-reserved inode for old ext2 filesystems */ 166 #define EXT2_GOOD_OLD_FIRST_INO 11 167 168 static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb) 169 { 170 return sb->s_fs_info; 171 } 172 173 /* 174 * Macro-instructions used to manage several block sizes 175 */ 176 #define EXT2_MIN_BLOCK_SIZE 1024 177 #define EXT2_MAX_BLOCK_SIZE 4096 178 #define EXT2_MIN_BLOCK_LOG_SIZE 10 179 #define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) 180 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32)) 181 #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 182 #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits) 183 #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size) 184 #define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino) 185 186 /* 187 * Macro-instructions used to manage fragments 188 */ 189 #define EXT2_MIN_FRAG_SIZE 1024 190 #define EXT2_MAX_FRAG_SIZE 4096 191 #define EXT2_MIN_FRAG_LOG_SIZE 10 192 #define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->s_frag_size) 193 #define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->s_frags_per_block) 194 195 /* 196 * Structure of a blocks group descriptor 197 */ 198 struct ext2_group_desc 199 { 200 __le32 bg_block_bitmap; /* Blocks bitmap block */ 201 __le32 bg_inode_bitmap; /* Inodes bitmap block */ 202 __le32 bg_inode_table; /* Inodes table block */ 203 __le16 bg_free_blocks_count; /* Free blocks count */ 204 __le16 bg_free_inodes_count; /* Free inodes count */ 205 __le16 bg_used_dirs_count; /* Directories count */ 206 __le16 bg_pad; 207 __le32 bg_reserved[3]; 208 }; 209 210 /* 211 * Macro-instructions used to manage group descriptors 212 */ 213 #define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 214 #define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) 215 #define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 216 #define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 217 218 /* 219 * Constants relative to the data blocks 220 */ 221 #define EXT2_NDIR_BLOCKS 12 222 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 223 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 224 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 225 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 226 227 /* 228 * Inode flags (GETFLAGS/SETFLAGS) 229 */ 230 #define EXT2_SECRM_FL FS_SECRM_FL /* Secure deletion */ 231 #define EXT2_UNRM_FL FS_UNRM_FL /* Undelete */ 232 #define EXT2_COMPR_FL FS_COMPR_FL /* Compress file */ 233 #define EXT2_SYNC_FL FS_SYNC_FL /* Synchronous updates */ 234 #define EXT2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */ 235 #define EXT2_APPEND_FL FS_APPEND_FL /* writes to file may only append */ 236 #define EXT2_NODUMP_FL FS_NODUMP_FL /* do not dump file */ 237 #define EXT2_NOATIME_FL FS_NOATIME_FL /* do not update atime */ 238 /* Reserved for compression usage... */ 239 #define EXT2_DIRTY_FL FS_DIRTY_FL 240 #define EXT2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */ 241 #define EXT2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */ 242 #define EXT2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */ 243 /* End compression flags --- maybe not all used */ 244 #define EXT2_BTREE_FL FS_BTREE_FL /* btree format dir */ 245 #define EXT2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */ 246 #define EXT2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */ 247 #define EXT2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */ 248 #define EXT2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */ 249 #define EXT2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */ 250 #define EXT2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/ 251 #define EXT2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */ 252 253 #define EXT2_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */ 254 #define EXT2_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */ 255 256 /* Flags that should be inherited by new inodes from their parent. */ 257 #define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\ 258 EXT2_SYNC_FL | EXT2_NODUMP_FL |\ 259 EXT2_NOATIME_FL | EXT2_COMPRBLK_FL |\ 260 EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\ 261 EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL) 262 263 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 264 #define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL)) 265 266 /* Flags that are appropriate for non-directories/regular files. */ 267 #define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL) 268 269 /* Mask out flags that are inappropriate for the given type of inode. */ 270 static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags) 271 { 272 if (S_ISDIR(mode)) 273 return flags; 274 else if (S_ISREG(mode)) 275 return flags & EXT2_REG_FLMASK; 276 else 277 return flags & EXT2_OTHER_FLMASK; 278 } 279 280 /* 281 * ioctl commands 282 */ 283 #define EXT2_IOC_GETFLAGS FS_IOC_GETFLAGS 284 #define EXT2_IOC_SETFLAGS FS_IOC_SETFLAGS 285 #define EXT2_IOC_GETVERSION FS_IOC_GETVERSION 286 #define EXT2_IOC_SETVERSION FS_IOC_SETVERSION 287 #define EXT2_IOC_GETRSVSZ _IOR('f', 5, long) 288 #define EXT2_IOC_SETRSVSZ _IOW('f', 6, long) 289 290 /* 291 * ioctl commands in 32 bit emulation 292 */ 293 #define EXT2_IOC32_GETFLAGS FS_IOC32_GETFLAGS 294 #define EXT2_IOC32_SETFLAGS FS_IOC32_SETFLAGS 295 #define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION 296 #define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION 297 298 /* 299 * Structure of an inode on the disk 300 */ 301 struct ext2_inode { 302 __le16 i_mode; /* File mode */ 303 __le16 i_uid; /* Low 16 bits of Owner Uid */ 304 __le32 i_size; /* Size in bytes */ 305 __le32 i_atime; /* Access time */ 306 __le32 i_ctime; /* Creation time */ 307 __le32 i_mtime; /* Modification time */ 308 __le32 i_dtime; /* Deletion Time */ 309 __le16 i_gid; /* Low 16 bits of Group Id */ 310 __le16 i_links_count; /* Links count */ 311 __le32 i_blocks; /* Blocks count */ 312 __le32 i_flags; /* File flags */ 313 union { 314 struct { 315 __le32 l_i_reserved1; 316 } linux1; 317 struct { 318 __le32 h_i_translator; 319 } hurd1; 320 struct { 321 __le32 m_i_reserved1; 322 } masix1; 323 } osd1; /* OS dependent 1 */ 324 __le32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 325 __le32 i_generation; /* File version (for NFS) */ 326 __le32 i_file_acl; /* File ACL */ 327 __le32 i_dir_acl; /* Directory ACL */ 328 __le32 i_faddr; /* Fragment address */ 329 union { 330 struct { 331 __u8 l_i_frag; /* Fragment number */ 332 __u8 l_i_fsize; /* Fragment size */ 333 __u16 i_pad1; 334 __le16 l_i_uid_high; /* these 2 fields */ 335 __le16 l_i_gid_high; /* were reserved2[0] */ 336 __u32 l_i_reserved2; 337 } linux2; 338 struct { 339 __u8 h_i_frag; /* Fragment number */ 340 __u8 h_i_fsize; /* Fragment size */ 341 __le16 h_i_mode_high; 342 __le16 h_i_uid_high; 343 __le16 h_i_gid_high; 344 __le32 h_i_author; 345 } hurd2; 346 struct { 347 __u8 m_i_frag; /* Fragment number */ 348 __u8 m_i_fsize; /* Fragment size */ 349 __u16 m_pad1; 350 __u32 m_i_reserved2[2]; 351 } masix2; 352 } osd2; /* OS dependent 2 */ 353 }; 354 355 #define i_size_high i_dir_acl 356 357 #define i_reserved1 osd1.linux1.l_i_reserved1 358 #define i_frag osd2.linux2.l_i_frag 359 #define i_fsize osd2.linux2.l_i_fsize 360 #define i_uid_low i_uid 361 #define i_gid_low i_gid 362 #define i_uid_high osd2.linux2.l_i_uid_high 363 #define i_gid_high osd2.linux2.l_i_gid_high 364 #define i_reserved2 osd2.linux2.l_i_reserved2 365 366 /* 367 * File system states 368 */ 369 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 370 #define EXT2_ERROR_FS 0x0002 /* Errors detected */ 371 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 372 373 /* 374 * Mount flags 375 */ 376 #define EXT2_MOUNT_CHECK 0x000001 /* Do mount-time checks */ 377 #define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */ 378 #define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */ 379 #define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */ 380 #define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */ 381 #define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */ 382 #define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */ 383 #define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */ 384 #define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */ 385 #define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */ 386 #define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */ 387 #define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */ 388 #define EXT2_MOUNT_XIP 0x010000 /* Obsolete, use DAX */ 389 #define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */ 390 #define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */ 391 #define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */ 392 #ifdef CONFIG_FS_DAX 393 #define EXT2_MOUNT_DAX 0x100000 /* Direct Access */ 394 #else 395 #define EXT2_MOUNT_DAX 0 396 #endif 397 398 399 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 400 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt 401 #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 402 EXT2_MOUNT_##opt) 403 /* 404 * Maximal mount counts between two filesystem checks 405 */ 406 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 407 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 408 409 /* 410 * Behaviour when detecting errors 411 */ 412 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 413 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 414 #define EXT2_ERRORS_PANIC 3 /* Panic */ 415 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 416 417 /* 418 * Structure of the super block 419 */ 420 struct ext2_super_block { 421 __le32 s_inodes_count; /* Inodes count */ 422 __le32 s_blocks_count; /* Blocks count */ 423 __le32 s_r_blocks_count; /* Reserved blocks count */ 424 __le32 s_free_blocks_count; /* Free blocks count */ 425 __le32 s_free_inodes_count; /* Free inodes count */ 426 __le32 s_first_data_block; /* First Data Block */ 427 __le32 s_log_block_size; /* Block size */ 428 __le32 s_log_frag_size; /* Fragment size */ 429 __le32 s_blocks_per_group; /* # Blocks per group */ 430 __le32 s_frags_per_group; /* # Fragments per group */ 431 __le32 s_inodes_per_group; /* # Inodes per group */ 432 __le32 s_mtime; /* Mount time */ 433 __le32 s_wtime; /* Write time */ 434 __le16 s_mnt_count; /* Mount count */ 435 __le16 s_max_mnt_count; /* Maximal mount count */ 436 __le16 s_magic; /* Magic signature */ 437 __le16 s_state; /* File system state */ 438 __le16 s_errors; /* Behaviour when detecting errors */ 439 __le16 s_minor_rev_level; /* minor revision level */ 440 __le32 s_lastcheck; /* time of last check */ 441 __le32 s_checkinterval; /* max. time between checks */ 442 __le32 s_creator_os; /* OS */ 443 __le32 s_rev_level; /* Revision level */ 444 __le16 s_def_resuid; /* Default uid for reserved blocks */ 445 __le16 s_def_resgid; /* Default gid for reserved blocks */ 446 /* 447 * These fields are for EXT2_DYNAMIC_REV superblocks only. 448 * 449 * Note: the difference between the compatible feature set and 450 * the incompatible feature set is that if there is a bit set 451 * in the incompatible feature set that the kernel doesn't 452 * know about, it should refuse to mount the filesystem. 453 * 454 * e2fsck's requirements are more strict; if it doesn't know 455 * about a feature in either the compatible or incompatible 456 * feature set, it must abort and not try to meddle with 457 * things it doesn't understand... 458 */ 459 __le32 s_first_ino; /* First non-reserved inode */ 460 __le16 s_inode_size; /* size of inode structure */ 461 __le16 s_block_group_nr; /* block group # of this superblock */ 462 __le32 s_feature_compat; /* compatible feature set */ 463 __le32 s_feature_incompat; /* incompatible feature set */ 464 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 465 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 466 char s_volume_name[16]; /* volume name */ 467 char s_last_mounted[64]; /* directory where last mounted */ 468 __le32 s_algorithm_usage_bitmap; /* For compression */ 469 /* 470 * Performance hints. Directory preallocation should only 471 * happen if the EXT2_COMPAT_PREALLOC flag is on. 472 */ 473 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 474 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 475 __u16 s_padding1; 476 /* 477 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set. 478 */ 479 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 480 __u32 s_journal_inum; /* inode number of journal file */ 481 __u32 s_journal_dev; /* device number of journal file */ 482 __u32 s_last_orphan; /* start of list of inodes to delete */ 483 __u32 s_hash_seed[4]; /* HTREE hash seed */ 484 __u8 s_def_hash_version; /* Default hash version to use */ 485 __u8 s_reserved_char_pad; 486 __u16 s_reserved_word_pad; 487 __le32 s_default_mount_opts; 488 __le32 s_first_meta_bg; /* First metablock block group */ 489 __u32 s_reserved[190]; /* Padding to the end of the block */ 490 }; 491 492 /* 493 * Codes for operating systems 494 */ 495 #define EXT2_OS_LINUX 0 496 #define EXT2_OS_HURD 1 497 #define EXT2_OS_MASIX 2 498 #define EXT2_OS_FREEBSD 3 499 #define EXT2_OS_LITES 4 500 501 /* 502 * Revision levels 503 */ 504 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 505 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 506 507 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 508 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 509 510 #define EXT2_GOOD_OLD_INODE_SIZE 128 511 512 /* 513 * Feature set definitions 514 */ 515 516 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 517 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) 518 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 519 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) 520 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 521 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) 522 #define EXT2_SET_COMPAT_FEATURE(sb,mask) \ 523 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 524 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \ 525 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 526 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \ 527 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 528 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \ 529 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 530 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 531 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 532 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 533 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 534 535 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 536 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 537 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 538 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 539 #define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010 540 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 541 #define EXT2_FEATURE_COMPAT_ANY 0xffffffff 542 543 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 544 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 545 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 546 #define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff 547 548 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 549 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 550 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 551 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 552 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 553 #define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff 554 555 #define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 556 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ 557 EXT2_FEATURE_INCOMPAT_META_BG) 558 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 559 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 560 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 561 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP 562 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP 563 564 /* 565 * Default values for user and/or group using reserved blocks 566 */ 567 #define EXT2_DEF_RESUID 0 568 #define EXT2_DEF_RESGID 0 569 570 /* 571 * Default mount options 572 */ 573 #define EXT2_DEFM_DEBUG 0x0001 574 #define EXT2_DEFM_BSDGROUPS 0x0002 575 #define EXT2_DEFM_XATTR_USER 0x0004 576 #define EXT2_DEFM_ACL 0x0008 577 #define EXT2_DEFM_UID16 0x0010 578 /* Not used by ext2, but reserved for use by ext3 */ 579 #define EXT3_DEFM_JMODE 0x0060 580 #define EXT3_DEFM_JMODE_DATA 0x0020 581 #define EXT3_DEFM_JMODE_ORDERED 0x0040 582 #define EXT3_DEFM_JMODE_WBACK 0x0060 583 584 /* 585 * Structure of a directory entry 586 */ 587 588 struct ext2_dir_entry { 589 __le32 inode; /* Inode number */ 590 __le16 rec_len; /* Directory entry length */ 591 __le16 name_len; /* Name length */ 592 char name[]; /* File name, up to EXT2_NAME_LEN */ 593 }; 594 595 /* 596 * The new version of the directory entry. Since EXT2 structures are 597 * stored in intel byte order, and the name_len field could never be 598 * bigger than 255 chars, it's safe to reclaim the extra byte for the 599 * file_type field. 600 */ 601 struct ext2_dir_entry_2 { 602 __le32 inode; /* Inode number */ 603 __le16 rec_len; /* Directory entry length */ 604 __u8 name_len; /* Name length */ 605 __u8 file_type; 606 char name[]; /* File name, up to EXT2_NAME_LEN */ 607 }; 608 609 /* 610 * Ext2 directory file types. Only the low 3 bits are used. The 611 * other bits are reserved for now. 612 */ 613 enum { 614 EXT2_FT_UNKNOWN = 0, 615 EXT2_FT_REG_FILE = 1, 616 EXT2_FT_DIR = 2, 617 EXT2_FT_CHRDEV = 3, 618 EXT2_FT_BLKDEV = 4, 619 EXT2_FT_FIFO = 5, 620 EXT2_FT_SOCK = 6, 621 EXT2_FT_SYMLINK = 7, 622 EXT2_FT_MAX 623 }; 624 625 /* 626 * EXT2_DIR_PAD defines the directory entries boundaries 627 * 628 * NOTE: It must be a multiple of 4 629 */ 630 #define EXT2_DIR_PAD 4 631 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 632 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 633 ~EXT2_DIR_ROUND) 634 #define EXT2_MAX_REC_LEN ((1<<16)-1) 635 636 static inline void verify_offsets(void) 637 { 638 #define A(x,y) BUILD_BUG_ON(x != offsetof(struct ext2_super_block, y)); 639 A(EXT2_SB_MAGIC_OFFSET, s_magic); 640 A(EXT2_SB_BLOCKS_OFFSET, s_blocks_count); 641 A(EXT2_SB_BSIZE_OFFSET, s_log_block_size); 642 #undef A 643 } 644 645 /* 646 * ext2 mount options 647 */ 648 struct ext2_mount_options { 649 unsigned long s_mount_opt; 650 kuid_t s_resuid; 651 kgid_t s_resgid; 652 }; 653 654 /* 655 * second extended file system inode data in memory 656 */ 657 struct ext2_inode_info { 658 __le32 i_data[15]; 659 __u32 i_flags; 660 __u32 i_faddr; 661 __u8 i_frag_no; 662 __u8 i_frag_size; 663 __u16 i_state; 664 __u32 i_file_acl; 665 __u32 i_dir_acl; 666 __u32 i_dtime; 667 668 /* 669 * i_block_group is the number of the block group which contains 670 * this file's inode. Constant across the lifetime of the inode, 671 * it is used for making block allocation decisions - we try to 672 * place a file's data blocks near its inode block, and new inodes 673 * near to their parent directory's inode. 674 */ 675 __u32 i_block_group; 676 677 /* block reservation info */ 678 struct ext2_block_alloc_info *i_block_alloc_info; 679 680 __u32 i_dir_start_lookup; 681 #ifdef CONFIG_EXT2_FS_XATTR 682 /* 683 * Extended attributes can be read independently of the main file 684 * data. Taking i_mutex even when reading would cause contention 685 * between readers of EAs and writers of regular file data, so 686 * instead we synchronize on xattr_sem when reading or changing 687 * EAs. 688 */ 689 struct rw_semaphore xattr_sem; 690 #endif 691 rwlock_t i_meta_lock; 692 #ifdef CONFIG_FS_DAX 693 struct rw_semaphore dax_sem; 694 #endif 695 696 /* 697 * truncate_mutex is for serialising ext2_truncate() against 698 * ext2_getblock(). It also protects the internals of the inode's 699 * reservation data structures: ext2_reserve_window and 700 * ext2_reserve_window_node. 701 */ 702 struct mutex truncate_mutex; 703 struct inode vfs_inode; 704 struct list_head i_orphan; /* unlinked but open inodes */ 705 #ifdef CONFIG_QUOTA 706 struct dquot *i_dquot[MAXQUOTAS]; 707 #endif 708 }; 709 710 #ifdef CONFIG_FS_DAX 711 #define dax_sem_down_write(ext2_inode) down_write(&(ext2_inode)->dax_sem) 712 #define dax_sem_up_write(ext2_inode) up_write(&(ext2_inode)->dax_sem) 713 #else 714 #define dax_sem_down_write(ext2_inode) 715 #define dax_sem_up_write(ext2_inode) 716 #endif 717 718 /* 719 * Inode dynamic state flags 720 */ 721 #define EXT2_STATE_NEW 0x00000001 /* inode is newly created */ 722 723 724 /* 725 * Function prototypes 726 */ 727 728 /* 729 * Ok, these declarations are also in <linux/kernel.h> but none of the 730 * ext2 source programs needs to include it so they are duplicated here. 731 */ 732 733 static inline struct ext2_inode_info *EXT2_I(struct inode *inode) 734 { 735 return container_of(inode, struct ext2_inode_info, vfs_inode); 736 } 737 738 /* balloc.c */ 739 extern int ext2_bg_has_super(struct super_block *sb, int group); 740 extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group); 741 extern ext2_fsblk_t ext2_new_block(struct inode *, unsigned long, int *); 742 extern ext2_fsblk_t ext2_new_blocks(struct inode *, unsigned long, 743 unsigned long *, int *); 744 extern int ext2_data_block_valid(struct ext2_sb_info *sbi, ext2_fsblk_t start_blk, 745 unsigned int count); 746 extern void ext2_free_blocks (struct inode *, unsigned long, 747 unsigned long); 748 extern unsigned long ext2_count_free_blocks (struct super_block *); 749 extern unsigned long ext2_count_dirs (struct super_block *); 750 extern void ext2_check_blocks_bitmap (struct super_block *); 751 extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb, 752 unsigned int block_group, 753 struct buffer_head ** bh); 754 extern void ext2_discard_reservation (struct inode *); 755 extern int ext2_should_retry_alloc(struct super_block *sb, int *retries); 756 extern void ext2_init_block_alloc_info(struct inode *); 757 extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_window_node *rsv); 758 759 /* dir.c */ 760 extern int ext2_add_link (struct dentry *, struct inode *); 761 extern ino_t ext2_inode_by_name(struct inode *, const struct qstr *); 762 extern int ext2_make_empty(struct inode *, struct inode *); 763 extern struct ext2_dir_entry_2 * ext2_find_entry (struct inode *,const struct qstr *, struct page **); 764 extern int ext2_delete_entry (struct ext2_dir_entry_2 *, struct page *); 765 extern int ext2_empty_dir (struct inode *); 766 extern struct ext2_dir_entry_2 * ext2_dotdot (struct inode *, struct page **); 767 extern void ext2_set_link(struct inode *, struct ext2_dir_entry_2 *, struct page *, struct inode *, int); 768 769 /* ialloc.c */ 770 extern struct inode * ext2_new_inode (struct inode *, umode_t, const struct qstr *); 771 extern void ext2_free_inode (struct inode *); 772 extern unsigned long ext2_count_free_inodes (struct super_block *); 773 extern void ext2_check_inodes_bitmap (struct super_block *); 774 extern unsigned long ext2_count_free (struct buffer_head *, unsigned); 775 776 /* inode.c */ 777 extern struct inode *ext2_iget (struct super_block *, unsigned long); 778 extern int ext2_write_inode (struct inode *, struct writeback_control *); 779 extern void ext2_evict_inode(struct inode *); 780 extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int); 781 extern int ext2_setattr (struct dentry *, struct iattr *); 782 extern void ext2_set_inode_flags(struct inode *inode); 783 extern int ext2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 784 u64 start, u64 len); 785 786 /* ioctl.c */ 787 extern long ext2_ioctl(struct file *, unsigned int, unsigned long); 788 extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long); 789 790 /* namei.c */ 791 struct dentry *ext2_get_parent(struct dentry *child); 792 793 /* super.c */ 794 extern __printf(3, 4) 795 void ext2_error(struct super_block *, const char *, const char *, ...); 796 extern __printf(3, 4) 797 void ext2_msg(struct super_block *, const char *, const char *, ...); 798 extern void ext2_update_dynamic_rev (struct super_block *sb); 799 extern void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, 800 int wait); 801 802 /* 803 * Inodes and files operations 804 */ 805 806 /* dir.c */ 807 extern const struct file_operations ext2_dir_operations; 808 809 /* file.c */ 810 extern int ext2_fsync(struct file *file, loff_t start, loff_t end, 811 int datasync); 812 extern const struct inode_operations ext2_file_inode_operations; 813 extern const struct file_operations ext2_file_operations; 814 815 /* inode.c */ 816 extern const struct address_space_operations ext2_aops; 817 extern const struct address_space_operations ext2_nobh_aops; 818 extern const struct iomap_ops ext2_iomap_ops; 819 820 /* namei.c */ 821 extern const struct inode_operations ext2_dir_inode_operations; 822 extern const struct inode_operations ext2_special_inode_operations; 823 824 /* symlink.c */ 825 extern const struct inode_operations ext2_fast_symlink_inode_operations; 826 extern const struct inode_operations ext2_symlink_inode_operations; 827 828 static inline ext2_fsblk_t 829 ext2_group_first_block_no(struct super_block *sb, unsigned long group_no) 830 { 831 return group_no * (ext2_fsblk_t)EXT2_BLOCKS_PER_GROUP(sb) + 832 le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block); 833 } 834 835 #define ext2_set_bit __test_and_set_bit_le 836 #define ext2_clear_bit __test_and_clear_bit_le 837 #define ext2_test_bit test_bit_le 838 #define ext2_find_first_zero_bit find_first_zero_bit_le 839 #define ext2_find_next_zero_bit find_next_zero_bit_le 840