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 #include <linux/mm.h> 20 #include <linux/highmem.h> 21 22 /* XXX Here for now... not interested in restructing headers JUST now */ 23 24 /* data type for block offset of block group */ 25 typedef int ext2_grpblk_t; 26 27 /* data type for filesystem-wide blocks number */ 28 typedef unsigned long ext2_fsblk_t; 29 30 #define E2FSBLK "%lu" 31 32 struct ext2_reserve_window { 33 ext2_fsblk_t _rsv_start; /* First byte reserved */ 34 ext2_fsblk_t _rsv_end; /* Last byte reserved or 0 */ 35 }; 36 37 struct ext2_reserve_window_node { 38 struct rb_node rsv_node; 39 __u32 rsv_goal_size; 40 __u32 rsv_alloc_hit; 41 struct ext2_reserve_window rsv_window; 42 }; 43 44 struct ext2_block_alloc_info { 45 /* information about reservation window */ 46 struct ext2_reserve_window_node rsv_window_node; 47 /* 48 * was i_next_alloc_block in ext2_inode_info 49 * is the logical (file-relative) number of the 50 * most-recently-allocated block in this file. 51 * We use this for detecting linearly ascending allocation requests. 52 */ 53 __u32 last_alloc_logical_block; 54 /* 55 * Was i_next_alloc_goal in ext2_inode_info 56 * is the *physical* companion to i_next_alloc_block. 57 * it is the physical block number of the block which was most-recently 58 * allocated to this file. This gives us the goal (target) for the next 59 * allocation when we detect linearly ascending requests. 60 */ 61 ext2_fsblk_t last_alloc_physical_block; 62 }; 63 64 #define rsv_start rsv_window._rsv_start 65 #define rsv_end rsv_window._rsv_end 66 67 struct mb_cache; 68 69 /* 70 * second extended-fs super-block data in memory 71 */ 72 struct ext2_sb_info { 73 unsigned long s_inodes_per_block;/* Number of inodes per block */ 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 }; 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 65536 177 #define EXT2_MIN_BLOCK_LOG_SIZE 10 178 #define EXT2_MAX_BLOCK_LOG_SIZE 16 179 #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 * Structure of a blocks group descriptor 188 */ 189 struct ext2_group_desc 190 { 191 __le32 bg_block_bitmap; /* Blocks bitmap block */ 192 __le32 bg_inode_bitmap; /* Inodes bitmap block */ 193 __le32 bg_inode_table; /* Inodes table block */ 194 __le16 bg_free_blocks_count; /* Free blocks count */ 195 __le16 bg_free_inodes_count; /* Free inodes count */ 196 __le16 bg_used_dirs_count; /* Directories count */ 197 __le16 bg_pad; 198 __le32 bg_reserved[3]; 199 }; 200 201 /* 202 * Macro-instructions used to manage group descriptors 203 */ 204 #define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 205 #define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) 206 #define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 207 #define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 208 209 /* 210 * Constants relative to the data blocks 211 */ 212 #define EXT2_NDIR_BLOCKS 12 213 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 214 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 215 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 216 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 217 218 /* 219 * Inode flags (GETFLAGS/SETFLAGS) 220 */ 221 #define EXT2_SECRM_FL FS_SECRM_FL /* Secure deletion */ 222 #define EXT2_UNRM_FL FS_UNRM_FL /* Undelete */ 223 #define EXT2_COMPR_FL FS_COMPR_FL /* Compress file */ 224 #define EXT2_SYNC_FL FS_SYNC_FL /* Synchronous updates */ 225 #define EXT2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */ 226 #define EXT2_APPEND_FL FS_APPEND_FL /* writes to file may only append */ 227 #define EXT2_NODUMP_FL FS_NODUMP_FL /* do not dump file */ 228 #define EXT2_NOATIME_FL FS_NOATIME_FL /* do not update atime */ 229 /* Reserved for compression usage... */ 230 #define EXT2_DIRTY_FL FS_DIRTY_FL 231 #define EXT2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */ 232 #define EXT2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */ 233 #define EXT2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */ 234 /* End compression flags --- maybe not all used */ 235 #define EXT2_BTREE_FL FS_BTREE_FL /* btree format dir */ 236 #define EXT2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */ 237 #define EXT2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */ 238 #define EXT2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */ 239 #define EXT2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */ 240 #define EXT2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */ 241 #define EXT2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/ 242 #define EXT2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */ 243 244 #define EXT2_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */ 245 #define EXT2_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */ 246 247 /* Flags that should be inherited by new inodes from their parent. */ 248 #define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\ 249 EXT2_SYNC_FL | EXT2_NODUMP_FL |\ 250 EXT2_NOATIME_FL | EXT2_COMPRBLK_FL |\ 251 EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\ 252 EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL) 253 254 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 255 #define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL)) 256 257 /* Flags that are appropriate for non-directories/regular files. */ 258 #define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL) 259 260 /* Mask out flags that are inappropriate for the given type of inode. */ 261 static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags) 262 { 263 if (S_ISDIR(mode)) 264 return flags; 265 else if (S_ISREG(mode)) 266 return flags & EXT2_REG_FLMASK; 267 else 268 return flags & EXT2_OTHER_FLMASK; 269 } 270 271 /* 272 * ioctl commands 273 */ 274 #define EXT2_IOC_GETVERSION FS_IOC_GETVERSION 275 #define EXT2_IOC_SETVERSION FS_IOC_SETVERSION 276 #define EXT2_IOC_GETRSVSZ _IOR('f', 5, long) 277 #define EXT2_IOC_SETRSVSZ _IOW('f', 6, long) 278 279 /* 280 * ioctl commands in 32 bit emulation 281 */ 282 #define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION 283 #define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION 284 285 /* 286 * Structure of an inode on the disk 287 */ 288 struct ext2_inode { 289 __le16 i_mode; /* File mode */ 290 __le16 i_uid; /* Low 16 bits of Owner Uid */ 291 __le32 i_size; /* Size in bytes */ 292 __le32 i_atime; /* Access time */ 293 __le32 i_ctime; /* Creation time */ 294 __le32 i_mtime; /* Modification time */ 295 __le32 i_dtime; /* Deletion Time */ 296 __le16 i_gid; /* Low 16 bits of Group Id */ 297 __le16 i_links_count; /* Links count */ 298 __le32 i_blocks; /* Blocks count */ 299 __le32 i_flags; /* File flags */ 300 union { 301 struct { 302 __le32 l_i_reserved1; 303 } linux1; 304 struct { 305 __le32 h_i_translator; 306 } hurd1; 307 struct { 308 __le32 m_i_reserved1; 309 } masix1; 310 } osd1; /* OS dependent 1 */ 311 __le32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 312 __le32 i_generation; /* File version (for NFS) */ 313 __le32 i_file_acl; /* File ACL */ 314 __le32 i_dir_acl; /* Directory ACL */ 315 __le32 i_faddr; /* Fragment address */ 316 union { 317 struct { 318 __u8 l_i_frag; /* Fragment number */ 319 __u8 l_i_fsize; /* Fragment size */ 320 __u16 i_pad1; 321 __le16 l_i_uid_high; /* these 2 fields */ 322 __le16 l_i_gid_high; /* were reserved2[0] */ 323 __u32 l_i_reserved2; 324 } linux2; 325 struct { 326 __u8 h_i_frag; /* Fragment number */ 327 __u8 h_i_fsize; /* Fragment size */ 328 __le16 h_i_mode_high; 329 __le16 h_i_uid_high; 330 __le16 h_i_gid_high; 331 __le32 h_i_author; 332 } hurd2; 333 struct { 334 __u8 m_i_frag; /* Fragment number */ 335 __u8 m_i_fsize; /* Fragment size */ 336 __u16 m_pad1; 337 __u32 m_i_reserved2[2]; 338 } masix2; 339 } osd2; /* OS dependent 2 */ 340 }; 341 342 #define i_size_high i_dir_acl 343 344 #define i_reserved1 osd1.linux1.l_i_reserved1 345 #define i_frag osd2.linux2.l_i_frag 346 #define i_fsize osd2.linux2.l_i_fsize 347 #define i_uid_low i_uid 348 #define i_gid_low i_gid 349 #define i_uid_high osd2.linux2.l_i_uid_high 350 #define i_gid_high osd2.linux2.l_i_gid_high 351 #define i_reserved2 osd2.linux2.l_i_reserved2 352 353 /* 354 * File system states 355 */ 356 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 357 #define EXT2_ERROR_FS 0x0002 /* Errors detected */ 358 359 /* 360 * Mount flags 361 */ 362 #define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */ 363 #define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */ 364 #define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */ 365 #define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */ 366 #define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */ 367 #define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */ 368 #define EXT2_MOUNT_ERRORS_MASK 0x000070 369 #define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */ 370 #define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */ 371 #define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */ 372 #define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */ 373 #define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */ 374 #define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */ 375 #define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */ 376 #define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */ 377 378 379 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 380 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt 381 #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 382 EXT2_MOUNT_##opt) 383 /* 384 * Maximal mount counts between two filesystem checks 385 */ 386 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 387 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 388 389 /* 390 * Behaviour when detecting errors 391 */ 392 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 393 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 394 #define EXT2_ERRORS_PANIC 3 /* Panic */ 395 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 396 397 /* 398 * Allocation flags 399 */ 400 #define EXT2_ALLOC_NORESERVE 0x1 /* Do not use reservation 401 * window for allocation */ 402 403 /* 404 * Structure of the super block 405 */ 406 struct ext2_super_block { 407 __le32 s_inodes_count; /* Inodes count */ 408 __le32 s_blocks_count; /* Blocks count */ 409 __le32 s_r_blocks_count; /* Reserved blocks count */ 410 __le32 s_free_blocks_count; /* Free blocks count */ 411 __le32 s_free_inodes_count; /* Free inodes count */ 412 __le32 s_first_data_block; /* First Data Block */ 413 __le32 s_log_block_size; /* Block size */ 414 __le32 s_log_frag_size; /* Fragment size */ 415 __le32 s_blocks_per_group; /* # Blocks per group */ 416 __le32 s_frags_per_group; /* # Fragments per group */ 417 __le32 s_inodes_per_group; /* # Inodes per group */ 418 __le32 s_mtime; /* Mount time */ 419 __le32 s_wtime; /* Write time */ 420 __le16 s_mnt_count; /* Mount count */ 421 __le16 s_max_mnt_count; /* Maximal mount count */ 422 __le16 s_magic; /* Magic signature */ 423 __le16 s_state; /* File system state */ 424 __le16 s_errors; /* Behaviour when detecting errors */ 425 __le16 s_minor_rev_level; /* minor revision level */ 426 __le32 s_lastcheck; /* time of last check */ 427 __le32 s_checkinterval; /* max. time between checks */ 428 __le32 s_creator_os; /* OS */ 429 __le32 s_rev_level; /* Revision level */ 430 __le16 s_def_resuid; /* Default uid for reserved blocks */ 431 __le16 s_def_resgid; /* Default gid for reserved blocks */ 432 /* 433 * These fields are for EXT2_DYNAMIC_REV superblocks only. 434 * 435 * Note: the difference between the compatible feature set and 436 * the incompatible feature set is that if there is a bit set 437 * in the incompatible feature set that the kernel doesn't 438 * know about, it should refuse to mount the filesystem. 439 * 440 * e2fsck's requirements are more strict; if it doesn't know 441 * about a feature in either the compatible or incompatible 442 * feature set, it must abort and not try to meddle with 443 * things it doesn't understand... 444 */ 445 __le32 s_first_ino; /* First non-reserved inode */ 446 __le16 s_inode_size; /* size of inode structure */ 447 __le16 s_block_group_nr; /* block group # of this superblock */ 448 __le32 s_feature_compat; /* compatible feature set */ 449 __le32 s_feature_incompat; /* incompatible feature set */ 450 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 451 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 452 char s_volume_name[16]; /* volume name */ 453 char s_last_mounted[64]; /* directory where last mounted */ 454 __le32 s_algorithm_usage_bitmap; /* For compression */ 455 /* 456 * Performance hints. Directory preallocation should only 457 * happen if the EXT2_COMPAT_PREALLOC flag is on. 458 */ 459 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 460 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 461 __u16 s_padding1; 462 /* 463 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set. 464 */ 465 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 466 __u32 s_journal_inum; /* inode number of journal file */ 467 __u32 s_journal_dev; /* device number of journal file */ 468 __u32 s_last_orphan; /* start of list of inodes to delete */ 469 __u32 s_hash_seed[4]; /* HTREE hash seed */ 470 __u8 s_def_hash_version; /* Default hash version to use */ 471 __u8 s_reserved_char_pad; 472 __u16 s_reserved_word_pad; 473 __le32 s_default_mount_opts; 474 __le32 s_first_meta_bg; /* First metablock block group */ 475 __u32 s_reserved[190]; /* Padding to the end of the block */ 476 }; 477 478 /* 479 * Codes for operating systems 480 */ 481 #define EXT2_OS_LINUX 0 482 #define EXT2_OS_HURD 1 483 #define EXT2_OS_MASIX 2 484 #define EXT2_OS_FREEBSD 3 485 #define EXT2_OS_LITES 4 486 487 /* 488 * Revision levels 489 */ 490 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 491 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 492 493 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 494 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 495 496 #define EXT2_GOOD_OLD_INODE_SIZE 128 497 498 /* 499 * Feature set definitions 500 */ 501 502 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 503 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) 504 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 505 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) 506 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 507 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) 508 #define EXT2_SET_COMPAT_FEATURE(sb,mask) \ 509 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 510 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \ 511 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 512 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \ 513 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 514 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \ 515 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 516 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 517 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 518 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 519 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 520 521 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 522 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 523 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 524 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 525 #define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010 526 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 527 #define EXT2_FEATURE_COMPAT_ANY 0xffffffff 528 529 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 530 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 531 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 532 #define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff 533 534 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 535 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 536 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 537 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 538 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 539 #define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff 540 541 #define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 542 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ 543 EXT2_FEATURE_INCOMPAT_META_BG) 544 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 545 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 546 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 547 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP 548 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP 549 550 /* 551 * Default values for user and/or group using reserved blocks 552 */ 553 #define EXT2_DEF_RESUID 0 554 #define EXT2_DEF_RESGID 0 555 556 /* 557 * Default mount options 558 */ 559 #define EXT2_DEFM_DEBUG 0x0001 560 #define EXT2_DEFM_BSDGROUPS 0x0002 561 #define EXT2_DEFM_XATTR_USER 0x0004 562 #define EXT2_DEFM_ACL 0x0008 563 #define EXT2_DEFM_UID16 0x0010 564 /* Not used by ext2, but reserved for use by ext3 */ 565 #define EXT3_DEFM_JMODE 0x0060 566 #define EXT3_DEFM_JMODE_DATA 0x0020 567 #define EXT3_DEFM_JMODE_ORDERED 0x0040 568 #define EXT3_DEFM_JMODE_WBACK 0x0060 569 570 /* 571 * Structure of a directory entry 572 */ 573 574 struct ext2_dir_entry { 575 __le32 inode; /* Inode number */ 576 __le16 rec_len; /* Directory entry length */ 577 __le16 name_len; /* Name length */ 578 char name[]; /* File name, up to EXT2_NAME_LEN */ 579 }; 580 581 /* 582 * The new version of the directory entry. Since EXT2 structures are 583 * stored in intel byte order, and the name_len field could never be 584 * bigger than 255 chars, it's safe to reclaim the extra byte for the 585 * file_type field. 586 */ 587 struct ext2_dir_entry_2 { 588 __le32 inode; /* Inode number */ 589 __le16 rec_len; /* Directory entry length */ 590 __u8 name_len; /* Name length */ 591 __u8 file_type; 592 char name[]; /* File name, up to EXT2_NAME_LEN */ 593 }; 594 595 /* 596 * EXT2_DIR_PAD defines the directory entries boundaries 597 * 598 * NOTE: It must be a multiple of 4 599 */ 600 #define EXT2_DIR_PAD 4 601 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 602 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 603 ~EXT2_DIR_ROUND) 604 #define EXT2_MAX_REC_LEN ((1<<16)-1) 605 606 static inline void verify_offsets(void) 607 { 608 #define A(x,y) BUILD_BUG_ON(x != offsetof(struct ext2_super_block, y)); 609 A(EXT2_SB_MAGIC_OFFSET, s_magic); 610 A(EXT2_SB_BLOCKS_OFFSET, s_blocks_count); 611 A(EXT2_SB_BSIZE_OFFSET, s_log_block_size); 612 #undef A 613 } 614 615 /* 616 * ext2 mount options 617 */ 618 struct ext2_mount_options { 619 unsigned long s_mount_opt; 620 kuid_t s_resuid; 621 kgid_t s_resgid; 622 }; 623 624 /* 625 * second extended file system inode data in memory 626 */ 627 struct ext2_inode_info { 628 __le32 i_data[15]; 629 __u32 i_flags; 630 __u32 i_faddr; 631 __u8 i_frag_no; 632 __u8 i_frag_size; 633 __u16 i_state; 634 __u32 i_file_acl; 635 __u32 i_dir_acl; 636 __u32 i_dtime; 637 638 /* 639 * i_block_group is the number of the block group which contains 640 * this file's inode. Constant across the lifetime of the inode, 641 * it is used for making block allocation decisions - we try to 642 * place a file's data blocks near its inode block, and new inodes 643 * near to their parent directory's inode. 644 */ 645 __u32 i_block_group; 646 647 /* block reservation info */ 648 struct ext2_block_alloc_info *i_block_alloc_info; 649 650 __u32 i_dir_start_lookup; 651 #ifdef CONFIG_EXT2_FS_XATTR 652 /* 653 * Extended attributes can be read independently of the main file 654 * data. Taking i_mutex even when reading would cause contention 655 * between readers of EAs and writers of regular file data, so 656 * instead we synchronize on xattr_sem when reading or changing 657 * EAs. 658 */ 659 struct rw_semaphore xattr_sem; 660 #endif 661 rwlock_t i_meta_lock; 662 663 /* 664 * truncate_mutex is for serialising ext2_truncate() against 665 * ext2_getblock(). It also protects the internals of the inode's 666 * reservation data structures: ext2_reserve_window and 667 * ext2_reserve_window_node. 668 */ 669 struct mutex truncate_mutex; 670 struct inode vfs_inode; 671 struct list_head i_orphan; /* unlinked but open inodes */ 672 #ifdef CONFIG_QUOTA 673 struct dquot __rcu *i_dquot[MAXQUOTAS]; 674 #endif 675 struct mapping_metadata_bhs i_metadata_bhs; 676 }; 677 678 /* 679 * Inode dynamic state flags 680 */ 681 #define EXT2_STATE_NEW 0x00000001 /* inode is newly created */ 682 683 684 /* 685 * Function prototypes 686 */ 687 688 /* 689 * Ok, these declarations are also in <linux/kernel.h> but none of the 690 * ext2 source programs needs to include it so they are duplicated here. 691 */ 692 693 static inline struct ext2_inode_info *EXT2_I(struct inode *inode) 694 { 695 return container_of(inode, struct ext2_inode_info, vfs_inode); 696 } 697 698 /* balloc.c */ 699 extern int ext2_bg_has_super(struct super_block *sb, int group); 700 extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group); 701 extern ext2_fsblk_t ext2_new_blocks(struct inode *, ext2_fsblk_t, 702 unsigned long *, int *, unsigned int); 703 extern int ext2_data_block_valid(struct ext2_sb_info *sbi, ext2_fsblk_t start_blk, 704 unsigned int count); 705 extern void ext2_free_blocks(struct inode *, ext2_fsblk_t, unsigned long); 706 extern unsigned long ext2_count_free_blocks (struct super_block *); 707 extern unsigned long ext2_count_dirs (struct super_block *); 708 extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb, 709 unsigned int block_group, 710 struct buffer_head ** bh); 711 extern void ext2_discard_reservation (struct inode *); 712 extern int ext2_should_retry_alloc(struct super_block *sb, int *retries); 713 extern void ext2_init_block_alloc_info(struct inode *); 714 extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_window_node *rsv); 715 716 /* dir.c */ 717 int ext2_add_link(struct dentry *, struct inode *); 718 int ext2_inode_by_name(struct inode *dir, 719 const struct qstr *child, ino_t *ino); 720 int ext2_make_empty(struct inode *, struct inode *); 721 struct ext2_dir_entry_2 *ext2_find_entry(struct inode *, const struct qstr *, 722 struct folio **foliop); 723 int ext2_delete_entry(struct ext2_dir_entry_2 *dir, struct folio *folio); 724 int ext2_empty_dir(struct inode *); 725 struct ext2_dir_entry_2 *ext2_dotdot(struct inode *dir, struct folio **foliop); 726 int ext2_set_link(struct inode *dir, struct ext2_dir_entry_2 *de, 727 struct folio *folio, struct inode *inode, bool update_times); 728 729 /* ialloc.c */ 730 extern struct inode * ext2_new_inode (struct inode *, umode_t, const struct qstr *); 731 extern void ext2_free_inode (struct inode *); 732 extern unsigned long ext2_count_free_inodes (struct super_block *); 733 extern unsigned long ext2_count_free (struct buffer_head *, unsigned); 734 735 /* inode.c */ 736 extern struct inode *ext2_iget (struct super_block *, unsigned long); 737 extern int ext2_write_inode (struct inode *, struct writeback_control *); 738 extern void ext2_evict_inode(struct inode *); 739 void ext2_write_failed(struct address_space *mapping, loff_t to); 740 extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int); 741 extern int ext2_setattr (struct mnt_idmap *, struct dentry *, struct iattr *); 742 extern int ext2_getattr (struct mnt_idmap *, const struct path *, 743 struct kstat *, u32, unsigned int); 744 extern void ext2_set_inode_flags(struct inode *inode); 745 extern int ext2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 746 u64 start, u64 len); 747 748 /* ioctl.c */ 749 extern int ext2_fileattr_get(struct dentry *dentry, struct file_kattr *fa); 750 extern int ext2_fileattr_set(struct mnt_idmap *idmap, 751 struct dentry *dentry, struct file_kattr *fa); 752 extern long ext2_ioctl(struct file *, unsigned int, unsigned long); 753 extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long); 754 755 /* namei.c */ 756 struct dentry *ext2_get_parent(struct dentry *child); 757 758 /* super.c */ 759 extern __printf(3, 4) 760 void ext2_error(struct super_block *, const char *, const char *, ...); 761 extern __printf(3, 4) 762 void ext2_msg(struct super_block *, const char *, const char *, ...); 763 extern void ext2_update_dynamic_rev (struct super_block *sb); 764 extern void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, 765 int wait); 766 767 /* 768 * Inodes and files operations 769 */ 770 771 /* dir.c */ 772 extern const struct file_operations ext2_dir_operations; 773 774 /* file.c */ 775 extern int ext2_fsync(struct file *file, loff_t start, loff_t end, 776 int datasync); 777 extern const struct inode_operations ext2_file_inode_operations; 778 extern const struct file_operations ext2_file_operations; 779 780 /* inode.c */ 781 extern void ext2_set_file_ops(struct inode *inode); 782 extern const struct address_space_operations ext2_aops; 783 extern const struct iomap_ops ext2_iomap_ops; 784 785 /* namei.c */ 786 extern const struct inode_operations ext2_dir_inode_operations; 787 extern const struct inode_operations ext2_special_inode_operations; 788 789 /* symlink.c */ 790 extern const struct inode_operations ext2_fast_symlink_inode_operations; 791 extern const struct inode_operations ext2_symlink_inode_operations; 792 793 static inline ext2_fsblk_t 794 ext2_group_first_block_no(struct super_block *sb, unsigned long group_no) 795 { 796 return group_no * (ext2_fsblk_t)EXT2_BLOCKS_PER_GROUP(sb) + 797 le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block); 798 } 799 800 static inline ext2_fsblk_t 801 ext2_group_last_block_no(struct super_block *sb, unsigned long group_no) 802 { 803 struct ext2_sb_info *sbi = EXT2_SB(sb); 804 805 if (group_no == sbi->s_groups_count - 1) 806 return le32_to_cpu(sbi->s_es->s_blocks_count) - 1; 807 else 808 return ext2_group_first_block_no(sb, group_no) + 809 EXT2_BLOCKS_PER_GROUP(sb) - 1; 810 } 811 812 #define ext2_set_bit __test_and_set_bit_le 813 #define ext2_clear_bit __test_and_clear_bit_le 814 #define ext2_test_bit test_bit_le 815 #define ext2_find_first_zero_bit find_first_zero_bit_le 816 #define ext2_find_next_zero_bit find_next_zero_bit_le 817