1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 1992, 1993, 1994, 1995 4 * Remy Card (card@masi.ibp.fr) 5 * Laboratoire MASI - Institut Blaise Pascal 6 * Universite Pierre et Marie Curie (Paris VI) 7 * 8 * from 9 * 10 * linux/include/linux/minix_fs.h 11 * 12 * Copyright (C) 1991, 1992 Linus Torvalds 13 */ 14 #include <linux/fs.h> 15 #include <linux/ext2_fs.h> 16 #include <linux/blockgroup_lock.h> 17 #include <linux/percpu_counter.h> 18 #include <linux/rbtree.h> 19 20 /* XXX Here for now... not interested in restructing headers JUST now */ 21 22 /* data type for block offset of block group */ 23 typedef int ext2_grpblk_t; 24 25 /* data type for filesystem-wide blocks number */ 26 typedef unsigned long ext2_fsblk_t; 27 28 #define E2FSBLK "%lu" 29 30 struct ext2_reserve_window { 31 ext2_fsblk_t _rsv_start; /* First byte reserved */ 32 ext2_fsblk_t _rsv_end; /* Last byte reserved or 0 */ 33 }; 34 35 struct ext2_reserve_window_node { 36 struct rb_node rsv_node; 37 __u32 rsv_goal_size; 38 __u32 rsv_alloc_hit; 39 struct ext2_reserve_window rsv_window; 40 }; 41 42 struct ext2_block_alloc_info { 43 /* information about reservation window */ 44 struct ext2_reserve_window_node rsv_window_node; 45 /* 46 * was i_next_alloc_block in ext2_inode_info 47 * is the logical (file-relative) number of the 48 * most-recently-allocated block in this file. 49 * We use this for detecting linearly ascending allocation requests. 50 */ 51 __u32 last_alloc_logical_block; 52 /* 53 * Was i_next_alloc_goal in ext2_inode_info 54 * is the *physical* companion to i_next_alloc_block. 55 * it the the physical block number of the block which was most-recentl 56 * allocated to this file. This give us the goal (target) for the next 57 * allocation when we detect linearly ascending requests. 58 */ 59 ext2_fsblk_t last_alloc_physical_block; 60 }; 61 62 #define rsv_start rsv_window._rsv_start 63 #define rsv_end rsv_window._rsv_end 64 65 struct mb_cache; 66 67 /* 68 * second extended-fs super-block data in memory 69 */ 70 struct ext2_sb_info { 71 unsigned long s_frag_size; /* Size of a fragment in bytes */ 72 unsigned long s_frags_per_block;/* Number of fragments per block */ 73 unsigned long s_inodes_per_block;/* Number of inodes per block */ 74 unsigned long s_frags_per_group;/* Number of fragments in a group */ 75 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 76 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 77 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 78 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 79 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 80 unsigned long s_groups_count; /* Number of groups in the fs */ 81 unsigned long s_overhead_last; /* Last calculated overhead */ 82 unsigned long s_blocks_last; /* Last seen block count */ 83 struct buffer_head * s_sbh; /* Buffer containing the super block */ 84 struct ext2_super_block * s_es; /* Pointer to the super block in the buffer */ 85 struct buffer_head ** s_group_desc; 86 unsigned long s_mount_opt; 87 unsigned long s_sb_block; 88 kuid_t s_resuid; 89 kgid_t s_resgid; 90 unsigned short s_mount_state; 91 unsigned short s_pad; 92 int s_addr_per_block_bits; 93 int s_desc_per_block_bits; 94 int s_inode_size; 95 int s_first_ino; 96 spinlock_t s_next_gen_lock; 97 u32 s_next_generation; 98 unsigned long s_dir_count; 99 u8 *s_debts; 100 struct percpu_counter s_freeblocks_counter; 101 struct percpu_counter s_freeinodes_counter; 102 struct percpu_counter s_dirs_counter; 103 struct blockgroup_lock *s_blockgroup_lock; 104 /* root of the per fs reservation window tree */ 105 spinlock_t s_rsv_window_lock; 106 struct rb_root s_rsv_window_root; 107 struct ext2_reserve_window_node s_rsv_window_head; 108 /* 109 * s_lock protects against concurrent modifications of s_mount_state, 110 * s_blocks_last, s_overhead_last and the content of superblock's 111 * buffer pointed to by sbi->s_es. 112 * 113 * Note: It is used in ext2_show_options() to provide a consistent view 114 * of the mount options. 115 */ 116 spinlock_t s_lock; 117 struct mb_cache *s_ea_block_cache; 118 struct dax_device *s_daxdev; 119 }; 120 121 static inline spinlock_t * 122 sb_bgl_lock(struct ext2_sb_info *sbi, unsigned int block_group) 123 { 124 return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group); 125 } 126 127 /* 128 * Define EXT2FS_DEBUG to produce debug messages 129 */ 130 #undef EXT2FS_DEBUG 131 132 /* 133 * Define EXT2_RESERVATION to reserve data blocks for expanding files 134 */ 135 #define EXT2_DEFAULT_RESERVE_BLOCKS 8 136 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */ 137 #define EXT2_MAX_RESERVE_BLOCKS 1027 138 #define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0 139 /* 140 * The second extended file system version 141 */ 142 #define EXT2FS_DATE "95/08/09" 143 #define EXT2FS_VERSION "0.5b" 144 145 /* 146 * Debug code 147 */ 148 #ifdef EXT2FS_DEBUG 149 # define ext2_debug(f, a...) { \ 150 printk ("EXT2-fs DEBUG (%s, %d): %s:", \ 151 __FILE__, __LINE__, __func__); \ 152 printk (f, ## a); \ 153 } 154 #else 155 # define ext2_debug(f, a...) /**/ 156 #endif 157 158 /* 159 * Special inode numbers 160 */ 161 #define EXT2_BAD_INO 1 /* Bad blocks inode */ 162 #define EXT2_ROOT_INO 2 /* Root inode */ 163 #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ 164 #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ 165 166 /* First non-reserved inode for old ext2 filesystems */ 167 #define EXT2_GOOD_OLD_FIRST_INO 11 168 169 static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb) 170 { 171 return sb->s_fs_info; 172 } 173 174 /* 175 * Macro-instructions used to manage several block sizes 176 */ 177 #define EXT2_MIN_BLOCK_SIZE 1024 178 #define EXT2_MAX_BLOCK_SIZE 4096 179 #define EXT2_MIN_BLOCK_LOG_SIZE 10 180 #define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) 181 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32)) 182 #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 183 #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits) 184 #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size) 185 #define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino) 186 187 /* 188 * Macro-instructions used to manage fragments 189 */ 190 #define EXT2_MIN_FRAG_SIZE 1024 191 #define EXT2_MAX_FRAG_SIZE 4096 192 #define EXT2_MIN_FRAG_LOG_SIZE 10 193 #define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->s_frag_size) 194 #define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->s_frags_per_block) 195 196 /* 197 * Structure of a blocks group descriptor 198 */ 199 struct ext2_group_desc 200 { 201 __le32 bg_block_bitmap; /* Blocks bitmap block */ 202 __le32 bg_inode_bitmap; /* Inodes bitmap block */ 203 __le32 bg_inode_table; /* Inodes table block */ 204 __le16 bg_free_blocks_count; /* Free blocks count */ 205 __le16 bg_free_inodes_count; /* Free inodes count */ 206 __le16 bg_used_dirs_count; /* Directories count */ 207 __le16 bg_pad; 208 __le32 bg_reserved[3]; 209 }; 210 211 /* 212 * Macro-instructions used to manage group descriptors 213 */ 214 #define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 215 #define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) 216 #define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 217 #define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 218 219 /* 220 * Constants relative to the data blocks 221 */ 222 #define EXT2_NDIR_BLOCKS 12 223 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 224 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 225 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 226 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 227 228 /* 229 * Inode flags (GETFLAGS/SETFLAGS) 230 */ 231 #define EXT2_SECRM_FL FS_SECRM_FL /* Secure deletion */ 232 #define EXT2_UNRM_FL FS_UNRM_FL /* Undelete */ 233 #define EXT2_COMPR_FL FS_COMPR_FL /* Compress file */ 234 #define EXT2_SYNC_FL FS_SYNC_FL /* Synchronous updates */ 235 #define EXT2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */ 236 #define EXT2_APPEND_FL FS_APPEND_FL /* writes to file may only append */ 237 #define EXT2_NODUMP_FL FS_NODUMP_FL /* do not dump file */ 238 #define EXT2_NOATIME_FL FS_NOATIME_FL /* do not update atime */ 239 /* Reserved for compression usage... */ 240 #define EXT2_DIRTY_FL FS_DIRTY_FL 241 #define EXT2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */ 242 #define EXT2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */ 243 #define EXT2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */ 244 /* End compression flags --- maybe not all used */ 245 #define EXT2_BTREE_FL FS_BTREE_FL /* btree format dir */ 246 #define EXT2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */ 247 #define EXT2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */ 248 #define EXT2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */ 249 #define EXT2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */ 250 #define EXT2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */ 251 #define EXT2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/ 252 #define EXT2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */ 253 254 #define EXT2_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */ 255 #define EXT2_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */ 256 257 /* Flags that should be inherited by new inodes from their parent. */ 258 #define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\ 259 EXT2_SYNC_FL | EXT2_NODUMP_FL |\ 260 EXT2_NOATIME_FL | EXT2_COMPRBLK_FL |\ 261 EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\ 262 EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL) 263 264 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 265 #define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL)) 266 267 /* Flags that are appropriate for non-directories/regular files. */ 268 #define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL) 269 270 /* Mask out flags that are inappropriate for the given type of inode. */ 271 static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags) 272 { 273 if (S_ISDIR(mode)) 274 return flags; 275 else if (S_ISREG(mode)) 276 return flags & EXT2_REG_FLMASK; 277 else 278 return flags & EXT2_OTHER_FLMASK; 279 } 280 281 /* 282 * ioctl commands 283 */ 284 #define EXT2_IOC_GETFLAGS FS_IOC_GETFLAGS 285 #define EXT2_IOC_SETFLAGS FS_IOC_SETFLAGS 286 #define EXT2_IOC_GETVERSION FS_IOC_GETVERSION 287 #define EXT2_IOC_SETVERSION FS_IOC_SETVERSION 288 #define EXT2_IOC_GETRSVSZ _IOR('f', 5, long) 289 #define EXT2_IOC_SETRSVSZ _IOW('f', 6, long) 290 291 /* 292 * ioctl commands in 32 bit emulation 293 */ 294 #define EXT2_IOC32_GETFLAGS FS_IOC32_GETFLAGS 295 #define EXT2_IOC32_SETFLAGS FS_IOC32_SETFLAGS 296 #define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION 297 #define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION 298 299 /* 300 * Structure of an inode on the disk 301 */ 302 struct ext2_inode { 303 __le16 i_mode; /* File mode */ 304 __le16 i_uid; /* Low 16 bits of Owner Uid */ 305 __le32 i_size; /* Size in bytes */ 306 __le32 i_atime; /* Access time */ 307 __le32 i_ctime; /* Creation time */ 308 __le32 i_mtime; /* Modification time */ 309 __le32 i_dtime; /* Deletion Time */ 310 __le16 i_gid; /* Low 16 bits of Group Id */ 311 __le16 i_links_count; /* Links count */ 312 __le32 i_blocks; /* Blocks count */ 313 __le32 i_flags; /* File flags */ 314 union { 315 struct { 316 __le32 l_i_reserved1; 317 } linux1; 318 struct { 319 __le32 h_i_translator; 320 } hurd1; 321 struct { 322 __le32 m_i_reserved1; 323 } masix1; 324 } osd1; /* OS dependent 1 */ 325 __le32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 326 __le32 i_generation; /* File version (for NFS) */ 327 __le32 i_file_acl; /* File ACL */ 328 __le32 i_dir_acl; /* Directory ACL */ 329 __le32 i_faddr; /* Fragment address */ 330 union { 331 struct { 332 __u8 l_i_frag; /* Fragment number */ 333 __u8 l_i_fsize; /* Fragment size */ 334 __u16 i_pad1; 335 __le16 l_i_uid_high; /* these 2 fields */ 336 __le16 l_i_gid_high; /* were reserved2[0] */ 337 __u32 l_i_reserved2; 338 } linux2; 339 struct { 340 __u8 h_i_frag; /* Fragment number */ 341 __u8 h_i_fsize; /* Fragment size */ 342 __le16 h_i_mode_high; 343 __le16 h_i_uid_high; 344 __le16 h_i_gid_high; 345 __le32 h_i_author; 346 } hurd2; 347 struct { 348 __u8 m_i_frag; /* Fragment number */ 349 __u8 m_i_fsize; /* Fragment size */ 350 __u16 m_pad1; 351 __u32 m_i_reserved2[2]; 352 } masix2; 353 } osd2; /* OS dependent 2 */ 354 }; 355 356 #define i_size_high i_dir_acl 357 358 #define i_reserved1 osd1.linux1.l_i_reserved1 359 #define i_frag osd2.linux2.l_i_frag 360 #define i_fsize osd2.linux2.l_i_fsize 361 #define i_uid_low i_uid 362 #define i_gid_low i_gid 363 #define i_uid_high osd2.linux2.l_i_uid_high 364 #define i_gid_high osd2.linux2.l_i_gid_high 365 #define i_reserved2 osd2.linux2.l_i_reserved2 366 367 /* 368 * File system states 369 */ 370 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 371 #define EXT2_ERROR_FS 0x0002 /* Errors detected */ 372 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 373 374 /* 375 * Mount flags 376 */ 377 #define EXT2_MOUNT_CHECK 0x000001 /* Do mount-time checks */ 378 #define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */ 379 #define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */ 380 #define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */ 381 #define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */ 382 #define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */ 383 #define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */ 384 #define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */ 385 #define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */ 386 #define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */ 387 #define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */ 388 #define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */ 389 #define EXT2_MOUNT_XIP 0x010000 /* Obsolete, use DAX */ 390 #define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */ 391 #define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */ 392 #define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */ 393 #define EXT2_MOUNT_DAX 0x100000 /* Direct Access */ 394 395 396 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 397 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt 398 #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 399 EXT2_MOUNT_##opt) 400 /* 401 * Maximal mount counts between two filesystem checks 402 */ 403 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 404 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 405 406 /* 407 * Behaviour when detecting errors 408 */ 409 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 410 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 411 #define EXT2_ERRORS_PANIC 3 /* Panic */ 412 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 413 414 /* 415 * Structure of the super block 416 */ 417 struct ext2_super_block { 418 __le32 s_inodes_count; /* Inodes count */ 419 __le32 s_blocks_count; /* Blocks count */ 420 __le32 s_r_blocks_count; /* Reserved blocks count */ 421 __le32 s_free_blocks_count; /* Free blocks count */ 422 __le32 s_free_inodes_count; /* Free inodes count */ 423 __le32 s_first_data_block; /* First Data Block */ 424 __le32 s_log_block_size; /* Block size */ 425 __le32 s_log_frag_size; /* Fragment size */ 426 __le32 s_blocks_per_group; /* # Blocks per group */ 427 __le32 s_frags_per_group; /* # Fragments per group */ 428 __le32 s_inodes_per_group; /* # Inodes per group */ 429 __le32 s_mtime; /* Mount time */ 430 __le32 s_wtime; /* Write time */ 431 __le16 s_mnt_count; /* Mount count */ 432 __le16 s_max_mnt_count; /* Maximal mount count */ 433 __le16 s_magic; /* Magic signature */ 434 __le16 s_state; /* File system state */ 435 __le16 s_errors; /* Behaviour when detecting errors */ 436 __le16 s_minor_rev_level; /* minor revision level */ 437 __le32 s_lastcheck; /* time of last check */ 438 __le32 s_checkinterval; /* max. time between checks */ 439 __le32 s_creator_os; /* OS */ 440 __le32 s_rev_level; /* Revision level */ 441 __le16 s_def_resuid; /* Default uid for reserved blocks */ 442 __le16 s_def_resgid; /* Default gid for reserved blocks */ 443 /* 444 * These fields are for EXT2_DYNAMIC_REV superblocks only. 445 * 446 * Note: the difference between the compatible feature set and 447 * the incompatible feature set is that if there is a bit set 448 * in the incompatible feature set that the kernel doesn't 449 * know about, it should refuse to mount the filesystem. 450 * 451 * e2fsck's requirements are more strict; if it doesn't know 452 * about a feature in either the compatible or incompatible 453 * feature set, it must abort and not try to meddle with 454 * things it doesn't understand... 455 */ 456 __le32 s_first_ino; /* First non-reserved inode */ 457 __le16 s_inode_size; /* size of inode structure */ 458 __le16 s_block_group_nr; /* block group # of this superblock */ 459 __le32 s_feature_compat; /* compatible feature set */ 460 __le32 s_feature_incompat; /* incompatible feature set */ 461 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 462 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 463 char s_volume_name[16]; /* volume name */ 464 char s_last_mounted[64]; /* directory where last mounted */ 465 __le32 s_algorithm_usage_bitmap; /* For compression */ 466 /* 467 * Performance hints. Directory preallocation should only 468 * happen if the EXT2_COMPAT_PREALLOC flag is on. 469 */ 470 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 471 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 472 __u16 s_padding1; 473 /* 474 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set. 475 */ 476 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 477 __u32 s_journal_inum; /* inode number of journal file */ 478 __u32 s_journal_dev; /* device number of journal file */ 479 __u32 s_last_orphan; /* start of list of inodes to delete */ 480 __u32 s_hash_seed[4]; /* HTREE hash seed */ 481 __u8 s_def_hash_version; /* Default hash version to use */ 482 __u8 s_reserved_char_pad; 483 __u16 s_reserved_word_pad; 484 __le32 s_default_mount_opts; 485 __le32 s_first_meta_bg; /* First metablock block group */ 486 __u32 s_reserved[190]; /* Padding to the end of the block */ 487 }; 488 489 /* 490 * Codes for operating systems 491 */ 492 #define EXT2_OS_LINUX 0 493 #define EXT2_OS_HURD 1 494 #define EXT2_OS_MASIX 2 495 #define EXT2_OS_FREEBSD 3 496 #define EXT2_OS_LITES 4 497 498 /* 499 * Revision levels 500 */ 501 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 502 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 503 504 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 505 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 506 507 #define EXT2_GOOD_OLD_INODE_SIZE 128 508 509 /* 510 * Feature set definitions 511 */ 512 513 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 514 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) 515 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 516 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) 517 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 518 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) 519 #define EXT2_SET_COMPAT_FEATURE(sb,mask) \ 520 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 521 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \ 522 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 523 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \ 524 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 525 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \ 526 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 527 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 528 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 529 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 530 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 531 532 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 533 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 534 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 535 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 536 #define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010 537 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 538 #define EXT2_FEATURE_COMPAT_ANY 0xffffffff 539 540 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 541 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 542 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 543 #define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff 544 545 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 546 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 547 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 548 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 549 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 550 #define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff 551 552 #define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 553 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ 554 EXT2_FEATURE_INCOMPAT_META_BG) 555 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 556 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 557 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 558 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP 559 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP 560 561 /* 562 * Default values for user and/or group using reserved blocks 563 */ 564 #define EXT2_DEF_RESUID 0 565 #define EXT2_DEF_RESGID 0 566 567 /* 568 * Default mount options 569 */ 570 #define EXT2_DEFM_DEBUG 0x0001 571 #define EXT2_DEFM_BSDGROUPS 0x0002 572 #define EXT2_DEFM_XATTR_USER 0x0004 573 #define EXT2_DEFM_ACL 0x0008 574 #define EXT2_DEFM_UID16 0x0010 575 /* Not used by ext2, but reserved for use by ext3 */ 576 #define EXT3_DEFM_JMODE 0x0060 577 #define EXT3_DEFM_JMODE_DATA 0x0020 578 #define EXT3_DEFM_JMODE_ORDERED 0x0040 579 #define EXT3_DEFM_JMODE_WBACK 0x0060 580 581 /* 582 * Structure of a directory entry 583 */ 584 585 struct ext2_dir_entry { 586 __le32 inode; /* Inode number */ 587 __le16 rec_len; /* Directory entry length */ 588 __le16 name_len; /* Name length */ 589 char name[]; /* File name, up to EXT2_NAME_LEN */ 590 }; 591 592 /* 593 * The new version of the directory entry. Since EXT2 structures are 594 * stored in intel byte order, and the name_len field could never be 595 * bigger than 255 chars, it's safe to reclaim the extra byte for the 596 * file_type field. 597 */ 598 struct ext2_dir_entry_2 { 599 __le32 inode; /* Inode number */ 600 __le16 rec_len; /* Directory entry length */ 601 __u8 name_len; /* Name length */ 602 __u8 file_type; 603 char name[]; /* File name, up to EXT2_NAME_LEN */ 604 }; 605 606 /* 607 * EXT2_DIR_PAD defines the directory entries boundaries 608 * 609 * NOTE: It must be a multiple of 4 610 */ 611 #define EXT2_DIR_PAD 4 612 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 613 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 614 ~EXT2_DIR_ROUND) 615 #define EXT2_MAX_REC_LEN ((1<<16)-1) 616 617 static inline void verify_offsets(void) 618 { 619 #define A(x,y) BUILD_BUG_ON(x != offsetof(struct ext2_super_block, y)); 620 A(EXT2_SB_MAGIC_OFFSET, s_magic); 621 A(EXT2_SB_BLOCKS_OFFSET, s_blocks_count); 622 A(EXT2_SB_BSIZE_OFFSET, s_log_block_size); 623 #undef A 624 } 625 626 /* 627 * ext2 mount options 628 */ 629 struct ext2_mount_options { 630 unsigned long s_mount_opt; 631 kuid_t s_resuid; 632 kgid_t s_resgid; 633 }; 634 635 /* 636 * second extended file system inode data in memory 637 */ 638 struct ext2_inode_info { 639 __le32 i_data[15]; 640 __u32 i_flags; 641 __u32 i_faddr; 642 __u8 i_frag_no; 643 __u8 i_frag_size; 644 __u16 i_state; 645 __u32 i_file_acl; 646 __u32 i_dir_acl; 647 __u32 i_dtime; 648 649 /* 650 * i_block_group is the number of the block group which contains 651 * this file's inode. Constant across the lifetime of the inode, 652 * it is used for making block allocation decisions - we try to 653 * place a file's data blocks near its inode block, and new inodes 654 * near to their parent directory's inode. 655 */ 656 __u32 i_block_group; 657 658 /* block reservation info */ 659 struct ext2_block_alloc_info *i_block_alloc_info; 660 661 __u32 i_dir_start_lookup; 662 #ifdef CONFIG_EXT2_FS_XATTR 663 /* 664 * Extended attributes can be read independently of the main file 665 * data. Taking i_mutex even when reading would cause contention 666 * between readers of EAs and writers of regular file data, so 667 * instead we synchronize on xattr_sem when reading or changing 668 * EAs. 669 */ 670 struct rw_semaphore xattr_sem; 671 #endif 672 rwlock_t i_meta_lock; 673 #ifdef CONFIG_FS_DAX 674 struct rw_semaphore dax_sem; 675 #endif 676 677 /* 678 * truncate_mutex is for serialising ext2_truncate() against 679 * ext2_getblock(). It also protects the internals of the inode's 680 * reservation data structures: ext2_reserve_window and 681 * ext2_reserve_window_node. 682 */ 683 struct mutex truncate_mutex; 684 struct inode vfs_inode; 685 struct list_head i_orphan; /* unlinked but open inodes */ 686 #ifdef CONFIG_QUOTA 687 struct dquot *i_dquot[MAXQUOTAS]; 688 #endif 689 }; 690 691 #ifdef CONFIG_FS_DAX 692 #define dax_sem_down_write(ext2_inode) down_write(&(ext2_inode)->dax_sem) 693 #define dax_sem_up_write(ext2_inode) up_write(&(ext2_inode)->dax_sem) 694 #else 695 #define dax_sem_down_write(ext2_inode) 696 #define dax_sem_up_write(ext2_inode) 697 #endif 698 699 /* 700 * Inode dynamic state flags 701 */ 702 #define EXT2_STATE_NEW 0x00000001 /* inode is newly created */ 703 704 705 /* 706 * Function prototypes 707 */ 708 709 /* 710 * Ok, these declarations are also in <linux/kernel.h> but none of the 711 * ext2 source programs needs to include it so they are duplicated here. 712 */ 713 714 static inline struct ext2_inode_info *EXT2_I(struct inode *inode) 715 { 716 return container_of(inode, struct ext2_inode_info, vfs_inode); 717 } 718 719 /* balloc.c */ 720 extern int ext2_bg_has_super(struct super_block *sb, int group); 721 extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group); 722 extern ext2_fsblk_t ext2_new_block(struct inode *, unsigned long, int *); 723 extern ext2_fsblk_t ext2_new_blocks(struct inode *, unsigned long, 724 unsigned long *, int *); 725 extern int ext2_data_block_valid(struct ext2_sb_info *sbi, ext2_fsblk_t start_blk, 726 unsigned int count); 727 extern void ext2_free_blocks (struct inode *, unsigned long, 728 unsigned long); 729 extern unsigned long ext2_count_free_blocks (struct super_block *); 730 extern unsigned long ext2_count_dirs (struct super_block *); 731 extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb, 732 unsigned int block_group, 733 struct buffer_head ** bh); 734 extern void ext2_discard_reservation (struct inode *); 735 extern int ext2_should_retry_alloc(struct super_block *sb, int *retries); 736 extern void ext2_init_block_alloc_info(struct inode *); 737 extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_window_node *rsv); 738 739 /* dir.c */ 740 extern int ext2_add_link (struct dentry *, struct inode *); 741 extern ino_t ext2_inode_by_name(struct inode *, const struct qstr *); 742 extern int ext2_make_empty(struct inode *, struct inode *); 743 extern struct ext2_dir_entry_2 * ext2_find_entry (struct inode *,const struct qstr *, struct page **); 744 extern int ext2_delete_entry (struct ext2_dir_entry_2 *, struct page *); 745 extern int ext2_empty_dir (struct inode *); 746 extern struct ext2_dir_entry_2 * ext2_dotdot (struct inode *, struct page **); 747 extern void ext2_set_link(struct inode *, struct ext2_dir_entry_2 *, struct page *, struct inode *, int); 748 749 /* ialloc.c */ 750 extern struct inode * ext2_new_inode (struct inode *, umode_t, const struct qstr *); 751 extern void ext2_free_inode (struct inode *); 752 extern unsigned long ext2_count_free_inodes (struct super_block *); 753 extern unsigned long ext2_count_free (struct buffer_head *, unsigned); 754 755 /* inode.c */ 756 extern struct inode *ext2_iget (struct super_block *, unsigned long); 757 extern int ext2_write_inode (struct inode *, struct writeback_control *); 758 extern void ext2_evict_inode(struct inode *); 759 extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int); 760 extern int ext2_setattr (struct dentry *, struct iattr *); 761 extern int ext2_getattr (const struct path *, struct kstat *, u32, unsigned int); 762 extern void ext2_set_inode_flags(struct inode *inode); 763 extern int ext2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 764 u64 start, u64 len); 765 766 /* ioctl.c */ 767 extern long ext2_ioctl(struct file *, unsigned int, unsigned long); 768 extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long); 769 770 /* namei.c */ 771 struct dentry *ext2_get_parent(struct dentry *child); 772 773 /* super.c */ 774 extern __printf(3, 4) 775 void ext2_error(struct super_block *, const char *, const char *, ...); 776 extern __printf(3, 4) 777 void ext2_msg(struct super_block *, const char *, const char *, ...); 778 extern void ext2_update_dynamic_rev (struct super_block *sb); 779 extern void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, 780 int wait); 781 782 /* 783 * Inodes and files operations 784 */ 785 786 /* dir.c */ 787 extern const struct file_operations ext2_dir_operations; 788 789 /* file.c */ 790 extern int ext2_fsync(struct file *file, loff_t start, loff_t end, 791 int datasync); 792 extern const struct inode_operations ext2_file_inode_operations; 793 extern const struct file_operations ext2_file_operations; 794 795 /* inode.c */ 796 extern void ext2_set_file_ops(struct inode *inode); 797 extern const struct address_space_operations ext2_aops; 798 extern const struct address_space_operations ext2_nobh_aops; 799 extern const struct iomap_ops ext2_iomap_ops; 800 801 /* namei.c */ 802 extern const struct inode_operations ext2_dir_inode_operations; 803 extern const struct inode_operations ext2_special_inode_operations; 804 805 /* symlink.c */ 806 extern const struct inode_operations ext2_fast_symlink_inode_operations; 807 extern const struct inode_operations ext2_symlink_inode_operations; 808 809 static inline ext2_fsblk_t 810 ext2_group_first_block_no(struct super_block *sb, unsigned long group_no) 811 { 812 return group_no * (ext2_fsblk_t)EXT2_BLOCKS_PER_GROUP(sb) + 813 le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block); 814 } 815 816 #define ext2_set_bit __test_and_set_bit_le 817 #define ext2_clear_bit __test_and_clear_bit_le 818 #define ext2_test_bit test_bit_le 819 #define ext2_find_first_zero_bit find_first_zero_bit_le 820 #define ext2_find_next_zero_bit find_next_zero_bit_le 821