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_frag_size; /* Size of a fragment in bytes */ 74 unsigned long s_frags_per_block;/* Number of fragments per block */ 75 unsigned long s_inodes_per_block;/* Number of inodes per block */ 76 unsigned long s_frags_per_group;/* Number of fragments in a group */ 77 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 78 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 79 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 80 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 81 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 82 unsigned long s_groups_count; /* Number of groups in the fs */ 83 unsigned long s_overhead_last; /* Last calculated overhead */ 84 unsigned long s_blocks_last; /* Last seen block count */ 85 struct buffer_head * s_sbh; /* Buffer containing the super block */ 86 struct ext2_super_block * s_es; /* Pointer to the super block in the buffer */ 87 struct buffer_head ** s_group_desc; 88 unsigned long s_mount_opt; 89 unsigned long s_sb_block; 90 kuid_t s_resuid; 91 kgid_t s_resgid; 92 unsigned short s_mount_state; 93 unsigned short s_pad; 94 int s_addr_per_block_bits; 95 int s_desc_per_block_bits; 96 int s_inode_size; 97 int s_first_ino; 98 spinlock_t s_next_gen_lock; 99 u32 s_next_generation; 100 unsigned long s_dir_count; 101 u8 *s_debts; 102 struct percpu_counter s_freeblocks_counter; 103 struct percpu_counter s_freeinodes_counter; 104 struct percpu_counter s_dirs_counter; 105 struct blockgroup_lock *s_blockgroup_lock; 106 /* root of the per fs reservation window tree */ 107 spinlock_t s_rsv_window_lock; 108 struct rb_root s_rsv_window_root; 109 struct ext2_reserve_window_node s_rsv_window_head; 110 /* 111 * s_lock protects against concurrent modifications of s_mount_state, 112 * s_blocks_last, s_overhead_last and the content of superblock's 113 * buffer pointed to by sbi->s_es. 114 * 115 * Note: It is used in ext2_show_options() to provide a consistent view 116 * of the mount options. 117 */ 118 spinlock_t s_lock; 119 struct mb_cache *s_ea_block_cache; 120 struct dax_device *s_daxdev; 121 }; 122 123 static inline spinlock_t * 124 sb_bgl_lock(struct ext2_sb_info *sbi, unsigned int block_group) 125 { 126 return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group); 127 } 128 129 /* 130 * Define EXT2FS_DEBUG to produce debug messages 131 */ 132 #undef EXT2FS_DEBUG 133 134 /* 135 * Define EXT2_RESERVATION to reserve data blocks for expanding files 136 */ 137 #define EXT2_DEFAULT_RESERVE_BLOCKS 8 138 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */ 139 #define EXT2_MAX_RESERVE_BLOCKS 1027 140 #define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0 141 /* 142 * The second extended file system version 143 */ 144 #define EXT2FS_DATE "95/08/09" 145 #define EXT2FS_VERSION "0.5b" 146 147 /* 148 * Debug code 149 */ 150 #ifdef EXT2FS_DEBUG 151 # define ext2_debug(f, a...) { \ 152 printk ("EXT2-fs DEBUG (%s, %d): %s:", \ 153 __FILE__, __LINE__, __func__); \ 154 printk (f, ## a); \ 155 } 156 #else 157 # define ext2_debug(f, a...) /**/ 158 #endif 159 160 /* 161 * Special inode numbers 162 */ 163 #define EXT2_BAD_INO 1 /* Bad blocks inode */ 164 #define EXT2_ROOT_INO 2 /* Root inode */ 165 #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ 166 #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ 167 168 /* First non-reserved inode for old ext2 filesystems */ 169 #define EXT2_GOOD_OLD_FIRST_INO 11 170 171 static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb) 172 { 173 return sb->s_fs_info; 174 } 175 176 /* 177 * Macro-instructions used to manage several block sizes 178 */ 179 #define EXT2_MIN_BLOCK_SIZE 1024 180 #define EXT2_MAX_BLOCK_SIZE 4096 181 #define EXT2_MIN_BLOCK_LOG_SIZE 10 182 #define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) 183 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32)) 184 #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 185 #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits) 186 #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size) 187 #define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino) 188 189 /* 190 * Macro-instructions used to manage fragments 191 */ 192 #define EXT2_MIN_FRAG_SIZE 1024 193 #define EXT2_MAX_FRAG_SIZE 4096 194 #define EXT2_MIN_FRAG_LOG_SIZE 10 195 #define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->s_frag_size) 196 #define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->s_frags_per_block) 197 198 /* 199 * Structure of a blocks group descriptor 200 */ 201 struct ext2_group_desc 202 { 203 __le32 bg_block_bitmap; /* Blocks bitmap block */ 204 __le32 bg_inode_bitmap; /* Inodes bitmap block */ 205 __le32 bg_inode_table; /* Inodes table block */ 206 __le16 bg_free_blocks_count; /* Free blocks count */ 207 __le16 bg_free_inodes_count; /* Free inodes count */ 208 __le16 bg_used_dirs_count; /* Directories count */ 209 __le16 bg_pad; 210 __le32 bg_reserved[3]; 211 }; 212 213 /* 214 * Macro-instructions used to manage group descriptors 215 */ 216 #define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 217 #define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) 218 #define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 219 #define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 220 221 /* 222 * Constants relative to the data blocks 223 */ 224 #define EXT2_NDIR_BLOCKS 12 225 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 226 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 227 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 228 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 229 230 /* 231 * Inode flags (GETFLAGS/SETFLAGS) 232 */ 233 #define EXT2_SECRM_FL FS_SECRM_FL /* Secure deletion */ 234 #define EXT2_UNRM_FL FS_UNRM_FL /* Undelete */ 235 #define EXT2_COMPR_FL FS_COMPR_FL /* Compress file */ 236 #define EXT2_SYNC_FL FS_SYNC_FL /* Synchronous updates */ 237 #define EXT2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */ 238 #define EXT2_APPEND_FL FS_APPEND_FL /* writes to file may only append */ 239 #define EXT2_NODUMP_FL FS_NODUMP_FL /* do not dump file */ 240 #define EXT2_NOATIME_FL FS_NOATIME_FL /* do not update atime */ 241 /* Reserved for compression usage... */ 242 #define EXT2_DIRTY_FL FS_DIRTY_FL 243 #define EXT2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */ 244 #define EXT2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */ 245 #define EXT2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */ 246 /* End compression flags --- maybe not all used */ 247 #define EXT2_BTREE_FL FS_BTREE_FL /* btree format dir */ 248 #define EXT2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */ 249 #define EXT2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */ 250 #define EXT2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */ 251 #define EXT2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */ 252 #define EXT2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */ 253 #define EXT2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/ 254 #define EXT2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */ 255 256 #define EXT2_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */ 257 #define EXT2_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */ 258 259 /* Flags that should be inherited by new inodes from their parent. */ 260 #define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\ 261 EXT2_SYNC_FL | EXT2_NODUMP_FL |\ 262 EXT2_NOATIME_FL | EXT2_COMPRBLK_FL |\ 263 EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\ 264 EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL) 265 266 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 267 #define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL)) 268 269 /* Flags that are appropriate for non-directories/regular files. */ 270 #define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL) 271 272 /* Mask out flags that are inappropriate for the given type of inode. */ 273 static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags) 274 { 275 if (S_ISDIR(mode)) 276 return flags; 277 else if (S_ISREG(mode)) 278 return flags & EXT2_REG_FLMASK; 279 else 280 return flags & EXT2_OTHER_FLMASK; 281 } 282 283 /* 284 * ioctl commands 285 */ 286 #define EXT2_IOC_GETFLAGS FS_IOC_GETFLAGS 287 #define EXT2_IOC_SETFLAGS FS_IOC_SETFLAGS 288 #define EXT2_IOC_GETVERSION FS_IOC_GETVERSION 289 #define EXT2_IOC_SETVERSION FS_IOC_SETVERSION 290 #define EXT2_IOC_GETRSVSZ _IOR('f', 5, long) 291 #define EXT2_IOC_SETRSVSZ _IOW('f', 6, long) 292 293 /* 294 * ioctl commands in 32 bit emulation 295 */ 296 #define EXT2_IOC32_GETFLAGS FS_IOC32_GETFLAGS 297 #define EXT2_IOC32_SETFLAGS FS_IOC32_SETFLAGS 298 #define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION 299 #define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION 300 301 /* 302 * Structure of an inode on the disk 303 */ 304 struct ext2_inode { 305 __le16 i_mode; /* File mode */ 306 __le16 i_uid; /* Low 16 bits of Owner Uid */ 307 __le32 i_size; /* Size in bytes */ 308 __le32 i_atime; /* Access time */ 309 __le32 i_ctime; /* Creation time */ 310 __le32 i_mtime; /* Modification time */ 311 __le32 i_dtime; /* Deletion Time */ 312 __le16 i_gid; /* Low 16 bits of Group Id */ 313 __le16 i_links_count; /* Links count */ 314 __le32 i_blocks; /* Blocks count */ 315 __le32 i_flags; /* File flags */ 316 union { 317 struct { 318 __le32 l_i_reserved1; 319 } linux1; 320 struct { 321 __le32 h_i_translator; 322 } hurd1; 323 struct { 324 __le32 m_i_reserved1; 325 } masix1; 326 } osd1; /* OS dependent 1 */ 327 __le32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 328 __le32 i_generation; /* File version (for NFS) */ 329 __le32 i_file_acl; /* File ACL */ 330 __le32 i_dir_acl; /* Directory ACL */ 331 __le32 i_faddr; /* Fragment address */ 332 union { 333 struct { 334 __u8 l_i_frag; /* Fragment number */ 335 __u8 l_i_fsize; /* Fragment size */ 336 __u16 i_pad1; 337 __le16 l_i_uid_high; /* these 2 fields */ 338 __le16 l_i_gid_high; /* were reserved2[0] */ 339 __u32 l_i_reserved2; 340 } linux2; 341 struct { 342 __u8 h_i_frag; /* Fragment number */ 343 __u8 h_i_fsize; /* Fragment size */ 344 __le16 h_i_mode_high; 345 __le16 h_i_uid_high; 346 __le16 h_i_gid_high; 347 __le32 h_i_author; 348 } hurd2; 349 struct { 350 __u8 m_i_frag; /* Fragment number */ 351 __u8 m_i_fsize; /* Fragment size */ 352 __u16 m_pad1; 353 __u32 m_i_reserved2[2]; 354 } masix2; 355 } osd2; /* OS dependent 2 */ 356 }; 357 358 #define i_size_high i_dir_acl 359 360 #define i_reserved1 osd1.linux1.l_i_reserved1 361 #define i_frag osd2.linux2.l_i_frag 362 #define i_fsize osd2.linux2.l_i_fsize 363 #define i_uid_low i_uid 364 #define i_gid_low i_gid 365 #define i_uid_high osd2.linux2.l_i_uid_high 366 #define i_gid_high osd2.linux2.l_i_gid_high 367 #define i_reserved2 osd2.linux2.l_i_reserved2 368 369 /* 370 * File system states 371 */ 372 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 373 #define EXT2_ERROR_FS 0x0002 /* Errors detected */ 374 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 375 376 /* 377 * Mount flags 378 */ 379 #define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */ 380 #define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */ 381 #define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */ 382 #define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */ 383 #define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */ 384 #define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */ 385 #define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */ 386 #define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */ 387 #define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */ 388 #define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */ 389 #define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */ 390 #define EXT2_MOUNT_XIP 0x010000 /* Obsolete, use DAX */ 391 #define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */ 392 #define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */ 393 #define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */ 394 #define EXT2_MOUNT_DAX 0x100000 /* Direct Access */ 395 396 397 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 398 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt 399 #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 400 EXT2_MOUNT_##opt) 401 /* 402 * Maximal mount counts between two filesystem checks 403 */ 404 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 405 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 406 407 /* 408 * Behaviour when detecting errors 409 */ 410 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 411 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 412 #define EXT2_ERRORS_PANIC 3 /* Panic */ 413 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 414 415 /* 416 * Structure of the super block 417 */ 418 struct ext2_super_block { 419 __le32 s_inodes_count; /* Inodes count */ 420 __le32 s_blocks_count; /* Blocks count */ 421 __le32 s_r_blocks_count; /* Reserved blocks count */ 422 __le32 s_free_blocks_count; /* Free blocks count */ 423 __le32 s_free_inodes_count; /* Free inodes count */ 424 __le32 s_first_data_block; /* First Data Block */ 425 __le32 s_log_block_size; /* Block size */ 426 __le32 s_log_frag_size; /* Fragment size */ 427 __le32 s_blocks_per_group; /* # Blocks per group */ 428 __le32 s_frags_per_group; /* # Fragments per group */ 429 __le32 s_inodes_per_group; /* # Inodes per group */ 430 __le32 s_mtime; /* Mount time */ 431 __le32 s_wtime; /* Write time */ 432 __le16 s_mnt_count; /* Mount count */ 433 __le16 s_max_mnt_count; /* Maximal mount count */ 434 __le16 s_magic; /* Magic signature */ 435 __le16 s_state; /* File system state */ 436 __le16 s_errors; /* Behaviour when detecting errors */ 437 __le16 s_minor_rev_level; /* minor revision level */ 438 __le32 s_lastcheck; /* time of last check */ 439 __le32 s_checkinterval; /* max. time between checks */ 440 __le32 s_creator_os; /* OS */ 441 __le32 s_rev_level; /* Revision level */ 442 __le16 s_def_resuid; /* Default uid for reserved blocks */ 443 __le16 s_def_resgid; /* Default gid for reserved blocks */ 444 /* 445 * These fields are for EXT2_DYNAMIC_REV superblocks only. 446 * 447 * Note: the difference between the compatible feature set and 448 * the incompatible feature set is that if there is a bit set 449 * in the incompatible feature set that the kernel doesn't 450 * know about, it should refuse to mount the filesystem. 451 * 452 * e2fsck's requirements are more strict; if it doesn't know 453 * about a feature in either the compatible or incompatible 454 * feature set, it must abort and not try to meddle with 455 * things it doesn't understand... 456 */ 457 __le32 s_first_ino; /* First non-reserved inode */ 458 __le16 s_inode_size; /* size of inode structure */ 459 __le16 s_block_group_nr; /* block group # of this superblock */ 460 __le32 s_feature_compat; /* compatible feature set */ 461 __le32 s_feature_incompat; /* incompatible feature set */ 462 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 463 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 464 char s_volume_name[16]; /* volume name */ 465 char s_last_mounted[64]; /* directory where last mounted */ 466 __le32 s_algorithm_usage_bitmap; /* For compression */ 467 /* 468 * Performance hints. Directory preallocation should only 469 * happen if the EXT2_COMPAT_PREALLOC flag is on. 470 */ 471 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 472 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 473 __u16 s_padding1; 474 /* 475 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set. 476 */ 477 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 478 __u32 s_journal_inum; /* inode number of journal file */ 479 __u32 s_journal_dev; /* device number of journal file */ 480 __u32 s_last_orphan; /* start of list of inodes to delete */ 481 __u32 s_hash_seed[4]; /* HTREE hash seed */ 482 __u8 s_def_hash_version; /* Default hash version to use */ 483 __u8 s_reserved_char_pad; 484 __u16 s_reserved_word_pad; 485 __le32 s_default_mount_opts; 486 __le32 s_first_meta_bg; /* First metablock block group */ 487 __u32 s_reserved[190]; /* Padding to the end of the block */ 488 }; 489 490 /* 491 * Codes for operating systems 492 */ 493 #define EXT2_OS_LINUX 0 494 #define EXT2_OS_HURD 1 495 #define EXT2_OS_MASIX 2 496 #define EXT2_OS_FREEBSD 3 497 #define EXT2_OS_LITES 4 498 499 /* 500 * Revision levels 501 */ 502 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 503 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 504 505 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 506 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 507 508 #define EXT2_GOOD_OLD_INODE_SIZE 128 509 510 /* 511 * Feature set definitions 512 */ 513 514 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 515 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) 516 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 517 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) 518 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 519 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) 520 #define EXT2_SET_COMPAT_FEATURE(sb,mask) \ 521 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 522 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \ 523 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 524 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \ 525 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 526 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \ 527 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 528 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 529 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 530 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 531 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 532 533 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 534 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 535 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 536 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 537 #define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010 538 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 539 #define EXT2_FEATURE_COMPAT_ANY 0xffffffff 540 541 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 542 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 543 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 544 #define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff 545 546 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 547 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 548 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 549 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 550 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 551 #define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff 552 553 #define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 554 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ 555 EXT2_FEATURE_INCOMPAT_META_BG) 556 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 557 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 558 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 559 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP 560 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP 561 562 /* 563 * Default values for user and/or group using reserved blocks 564 */ 565 #define EXT2_DEF_RESUID 0 566 #define EXT2_DEF_RESGID 0 567 568 /* 569 * Default mount options 570 */ 571 #define EXT2_DEFM_DEBUG 0x0001 572 #define EXT2_DEFM_BSDGROUPS 0x0002 573 #define EXT2_DEFM_XATTR_USER 0x0004 574 #define EXT2_DEFM_ACL 0x0008 575 #define EXT2_DEFM_UID16 0x0010 576 /* Not used by ext2, but reserved for use by ext3 */ 577 #define EXT3_DEFM_JMODE 0x0060 578 #define EXT3_DEFM_JMODE_DATA 0x0020 579 #define EXT3_DEFM_JMODE_ORDERED 0x0040 580 #define EXT3_DEFM_JMODE_WBACK 0x0060 581 582 /* 583 * Structure of a directory entry 584 */ 585 586 struct ext2_dir_entry { 587 __le32 inode; /* Inode number */ 588 __le16 rec_len; /* Directory entry length */ 589 __le16 name_len; /* Name length */ 590 char name[]; /* File name, up to EXT2_NAME_LEN */ 591 }; 592 593 /* 594 * The new version of the directory entry. Since EXT2 structures are 595 * stored in intel byte order, and the name_len field could never be 596 * bigger than 255 chars, it's safe to reclaim the extra byte for the 597 * file_type field. 598 */ 599 struct ext2_dir_entry_2 { 600 __le32 inode; /* Inode number */ 601 __le16 rec_len; /* Directory entry length */ 602 __u8 name_len; /* Name length */ 603 __u8 file_type; 604 char name[]; /* File name, up to EXT2_NAME_LEN */ 605 }; 606 607 /* 608 * EXT2_DIR_PAD defines the directory entries boundaries 609 * 610 * NOTE: It must be a multiple of 4 611 */ 612 #define EXT2_DIR_PAD 4 613 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 614 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 615 ~EXT2_DIR_ROUND) 616 #define EXT2_MAX_REC_LEN ((1<<16)-1) 617 618 static inline void verify_offsets(void) 619 { 620 #define A(x,y) BUILD_BUG_ON(x != offsetof(struct ext2_super_block, y)); 621 A(EXT2_SB_MAGIC_OFFSET, s_magic); 622 A(EXT2_SB_BLOCKS_OFFSET, s_blocks_count); 623 A(EXT2_SB_BSIZE_OFFSET, s_log_block_size); 624 #undef A 625 } 626 627 /* 628 * ext2 mount options 629 */ 630 struct ext2_mount_options { 631 unsigned long s_mount_opt; 632 kuid_t s_resuid; 633 kgid_t s_resgid; 634 }; 635 636 /* 637 * second extended file system inode data in memory 638 */ 639 struct ext2_inode_info { 640 __le32 i_data[15]; 641 __u32 i_flags; 642 __u32 i_faddr; 643 __u8 i_frag_no; 644 __u8 i_frag_size; 645 __u16 i_state; 646 __u32 i_file_acl; 647 __u32 i_dir_acl; 648 __u32 i_dtime; 649 650 /* 651 * i_block_group is the number of the block group which contains 652 * this file's inode. Constant across the lifetime of the inode, 653 * it is used for making block allocation decisions - we try to 654 * place a file's data blocks near its inode block, and new inodes 655 * near to their parent directory's inode. 656 */ 657 __u32 i_block_group; 658 659 /* block reservation info */ 660 struct ext2_block_alloc_info *i_block_alloc_info; 661 662 __u32 i_dir_start_lookup; 663 #ifdef CONFIG_EXT2_FS_XATTR 664 /* 665 * Extended attributes can be read independently of the main file 666 * data. Taking i_mutex even when reading would cause contention 667 * between readers of EAs and writers of regular file data, so 668 * instead we synchronize on xattr_sem when reading or changing 669 * EAs. 670 */ 671 struct rw_semaphore xattr_sem; 672 #endif 673 rwlock_t i_meta_lock; 674 #ifdef CONFIG_FS_DAX 675 struct rw_semaphore dax_sem; 676 #endif 677 678 /* 679 * truncate_mutex is for serialising ext2_truncate() against 680 * ext2_getblock(). It also protects the internals of the inode's 681 * reservation data structures: ext2_reserve_window and 682 * ext2_reserve_window_node. 683 */ 684 struct mutex truncate_mutex; 685 struct inode vfs_inode; 686 struct list_head i_orphan; /* unlinked but open inodes */ 687 #ifdef CONFIG_QUOTA 688 struct dquot *i_dquot[MAXQUOTAS]; 689 #endif 690 }; 691 692 #ifdef CONFIG_FS_DAX 693 #define dax_sem_down_write(ext2_inode) down_write(&(ext2_inode)->dax_sem) 694 #define dax_sem_up_write(ext2_inode) up_write(&(ext2_inode)->dax_sem) 695 #else 696 #define dax_sem_down_write(ext2_inode) 697 #define dax_sem_up_write(ext2_inode) 698 #endif 699 700 /* 701 * Inode dynamic state flags 702 */ 703 #define EXT2_STATE_NEW 0x00000001 /* inode is newly created */ 704 705 706 /* 707 * Function prototypes 708 */ 709 710 /* 711 * Ok, these declarations are also in <linux/kernel.h> but none of the 712 * ext2 source programs needs to include it so they are duplicated here. 713 */ 714 715 static inline struct ext2_inode_info *EXT2_I(struct inode *inode) 716 { 717 return container_of(inode, struct ext2_inode_info, vfs_inode); 718 } 719 720 /* balloc.c */ 721 extern int ext2_bg_has_super(struct super_block *sb, int group); 722 extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group); 723 extern ext2_fsblk_t ext2_new_block(struct inode *, unsigned long, int *); 724 extern ext2_fsblk_t ext2_new_blocks(struct inode *, unsigned long, 725 unsigned long *, int *); 726 extern int ext2_data_block_valid(struct ext2_sb_info *sbi, ext2_fsblk_t start_blk, 727 unsigned int count); 728 extern void ext2_free_blocks (struct inode *, unsigned long, 729 unsigned long); 730 extern unsigned long ext2_count_free_blocks (struct super_block *); 731 extern unsigned long ext2_count_dirs (struct super_block *); 732 extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb, 733 unsigned int block_group, 734 struct buffer_head ** bh); 735 extern void ext2_discard_reservation (struct inode *); 736 extern int ext2_should_retry_alloc(struct super_block *sb, int *retries); 737 extern void ext2_init_block_alloc_info(struct inode *); 738 extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_window_node *rsv); 739 740 /* dir.c */ 741 extern int ext2_add_link (struct dentry *, struct inode *); 742 extern int ext2_inode_by_name(struct inode *dir, 743 const struct qstr *child, ino_t *ino); 744 extern int ext2_make_empty(struct inode *, struct inode *); 745 extern struct ext2_dir_entry_2 * ext2_find_entry (struct inode *,const struct qstr *, struct page **); 746 extern int ext2_delete_entry (struct ext2_dir_entry_2 *, struct page *); 747 extern int ext2_empty_dir (struct inode *); 748 extern struct ext2_dir_entry_2 * ext2_dotdot (struct inode *, struct page **); 749 extern void ext2_set_link(struct inode *, struct ext2_dir_entry_2 *, struct page *, struct inode *, int); 750 static inline void ext2_put_page(struct page *page) 751 { 752 kunmap(page); 753 put_page(page); 754 } 755 756 /* ialloc.c */ 757 extern struct inode * ext2_new_inode (struct inode *, umode_t, const struct qstr *); 758 extern void ext2_free_inode (struct inode *); 759 extern unsigned long ext2_count_free_inodes (struct super_block *); 760 extern unsigned long ext2_count_free (struct buffer_head *, unsigned); 761 762 /* inode.c */ 763 extern struct inode *ext2_iget (struct super_block *, unsigned long); 764 extern int ext2_write_inode (struct inode *, struct writeback_control *); 765 extern void ext2_evict_inode(struct inode *); 766 extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int); 767 extern int ext2_setattr (struct dentry *, struct iattr *); 768 extern int ext2_getattr (const struct path *, struct kstat *, u32, unsigned int); 769 extern void ext2_set_inode_flags(struct inode *inode); 770 extern int ext2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 771 u64 start, u64 len); 772 773 /* ioctl.c */ 774 extern long ext2_ioctl(struct file *, unsigned int, unsigned long); 775 extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long); 776 777 /* namei.c */ 778 struct dentry *ext2_get_parent(struct dentry *child); 779 780 /* super.c */ 781 extern __printf(3, 4) 782 void ext2_error(struct super_block *, const char *, const char *, ...); 783 extern __printf(3, 4) 784 void ext2_msg(struct super_block *, const char *, const char *, ...); 785 extern void ext2_update_dynamic_rev (struct super_block *sb); 786 extern void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, 787 int wait); 788 789 /* 790 * Inodes and files operations 791 */ 792 793 /* dir.c */ 794 extern const struct file_operations ext2_dir_operations; 795 796 /* file.c */ 797 extern int ext2_fsync(struct file *file, loff_t start, loff_t end, 798 int datasync); 799 extern const struct inode_operations ext2_file_inode_operations; 800 extern const struct file_operations ext2_file_operations; 801 802 /* inode.c */ 803 extern void ext2_set_file_ops(struct inode *inode); 804 extern const struct address_space_operations ext2_aops; 805 extern const struct address_space_operations ext2_nobh_aops; 806 extern const struct iomap_ops ext2_iomap_ops; 807 808 /* namei.c */ 809 extern const struct inode_operations ext2_dir_inode_operations; 810 extern const struct inode_operations ext2_special_inode_operations; 811 812 /* symlink.c */ 813 extern const struct inode_operations ext2_fast_symlink_inode_operations; 814 extern const struct inode_operations ext2_symlink_inode_operations; 815 816 static inline ext2_fsblk_t 817 ext2_group_first_block_no(struct super_block *sb, unsigned long group_no) 818 { 819 return group_no * (ext2_fsblk_t)EXT2_BLOCKS_PER_GROUP(sb) + 820 le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block); 821 } 822 823 static inline ext2_fsblk_t 824 ext2_group_last_block_no(struct super_block *sb, unsigned long group_no) 825 { 826 struct ext2_sb_info *sbi = EXT2_SB(sb); 827 828 if (group_no == sbi->s_groups_count - 1) 829 return le32_to_cpu(sbi->s_es->s_blocks_count) - 1; 830 else 831 return ext2_group_first_block_no(sb, group_no) + 832 EXT2_BLOCKS_PER_GROUP(sb) - 1; 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