1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * ext4.h 4 * 5 * Copyright (C) 1992, 1993, 1994, 1995 6 * Remy Card (card@masi.ibp.fr) 7 * Laboratoire MASI - Institut Blaise Pascal 8 * Universite Pierre et Marie Curie (Paris VI) 9 * 10 * from 11 * 12 * linux/include/linux/minix_fs.h 13 * 14 * Copyright (C) 1991, 1992 Linus Torvalds 15 */ 16 17 #ifndef _EXT4_H 18 #define _EXT4_H 19 20 #include <linux/refcount.h> 21 #include <linux/types.h> 22 #include <linux/blkdev.h> 23 #include <linux/magic.h> 24 #include <linux/jbd2.h> 25 #include <linux/quota.h> 26 #include <linux/rwsem.h> 27 #include <linux/rbtree.h> 28 #include <linux/seqlock.h> 29 #include <linux/mutex.h> 30 #include <linux/timer.h> 31 #include <linux/wait.h> 32 #include <linux/sched/signal.h> 33 #include <linux/blockgroup_lock.h> 34 #include <linux/percpu_counter.h> 35 #include <linux/ratelimit.h> 36 #include <crypto/hash.h> 37 #include <linux/falloc.h> 38 #include <linux/percpu-rwsem.h> 39 #include <linux/fiemap.h> 40 #ifdef __KERNEL__ 41 #include <linux/compat.h> 42 #endif 43 #include <uapi/linux/ext4.h> 44 45 #include <linux/fscrypt.h> 46 #include <linux/fsverity.h> 47 48 #include <linux/compiler.h> 49 50 /* 51 * The fourth extended filesystem constants/structures 52 */ 53 54 /* 55 * with AGGRESSIVE_CHECK allocator runs consistency checks over 56 * structures. these checks slow things down a lot 57 */ 58 #define AGGRESSIVE_CHECK__ 59 60 /* 61 * with DOUBLE_CHECK defined mballoc creates persistent in-core 62 * bitmaps, maintains and uses them to check for double allocations 63 */ 64 #define DOUBLE_CHECK__ 65 66 /* 67 * Define EXT4FS_DEBUG to produce debug messages 68 */ 69 #undef EXT4FS_DEBUG 70 71 /* 72 * Debug code 73 */ 74 #ifdef EXT4FS_DEBUG 75 #define ext4_debug(f, a...) \ 76 do { \ 77 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 78 __FILE__, __LINE__, __func__); \ 79 printk(KERN_DEBUG f, ## a); \ 80 } while (0) 81 #else 82 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 83 #endif 84 85 /* 86 * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c 87 */ 88 #define EXT_DEBUG__ 89 90 /* 91 * Dynamic printk for controlled extents debugging. 92 */ 93 #ifdef CONFIG_EXT4_DEBUG 94 #define ext_debug(ino, fmt, ...) \ 95 pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt, \ 96 current->comm, task_pid_nr(current), \ 97 ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__, \ 98 __func__, ##__VA_ARGS__) 99 #else 100 #define ext_debug(ino, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 101 #endif 102 103 #define ASSERT(assert) \ 104 do { \ 105 if (unlikely(!(assert))) { \ 106 printk(KERN_EMERG \ 107 "Assertion failure in %s() at %s:%d: '%s'\n", \ 108 __func__, __FILE__, __LINE__, #assert); \ 109 BUG(); \ 110 } \ 111 } while (0) 112 113 /* data type for block offset of block group */ 114 typedef int ext4_grpblk_t; 115 116 /* data type for filesystem-wide blocks number */ 117 typedef unsigned long long ext4_fsblk_t; 118 119 /* data type for file logical block number */ 120 typedef __u32 ext4_lblk_t; 121 122 /* data type for block group number */ 123 typedef unsigned int ext4_group_t; 124 125 enum SHIFT_DIRECTION { 126 SHIFT_LEFT = 0, 127 SHIFT_RIGHT, 128 }; 129 130 /* 131 * For each criteria, mballoc has slightly different way of finding 132 * the required blocks nad usually, higher the criteria the slower the 133 * allocation. We start at lower criterias and keep falling back to 134 * higher ones if we are not able to find any blocks. Lower (earlier) 135 * criteria are faster. 136 */ 137 enum criteria { 138 /* 139 * Used when number of blocks needed is a power of 2. This 140 * doesn't trigger any disk IO except prefetch and is the 141 * fastest criteria. 142 */ 143 CR_POWER2_ALIGNED, 144 145 /* 146 * Tries to lookup in-memory data structures to find the most 147 * suitable group that satisfies goal request. No disk IO 148 * except block prefetch. 149 */ 150 CR_GOAL_LEN_FAST, 151 152 /* 153 * Same as CR_GOAL_LEN_FAST but is allowed to reduce the goal 154 * length to the best available length for faster allocation. 155 */ 156 CR_BEST_AVAIL_LEN, 157 158 /* 159 * Reads each block group sequentially, performing disk IO if 160 * necessary, to find find_suitable block group. Tries to 161 * allocate goal length but might trim the request if nothing 162 * is found after enough tries. 163 */ 164 CR_GOAL_LEN_SLOW, 165 166 /* 167 * Finds the first free set of blocks and allocates 168 * those. This is only used in rare cases when 169 * CR_GOAL_LEN_SLOW also fails to allocate anything. 170 */ 171 CR_ANY_FREE, 172 173 /* 174 * Number of criterias defined. 175 */ 176 EXT4_MB_NUM_CRS 177 }; 178 179 /* 180 * Flags used in mballoc's allocation_context flags field. 181 * 182 * Also used to show what's going on for debugging purposes when the 183 * flag field is exported via the traceport interface 184 */ 185 186 /* prefer goal again. length */ 187 #define EXT4_MB_HINT_MERGE 0x0001 188 /* blocks already reserved */ 189 #define EXT4_MB_HINT_RESERVED 0x0002 190 /* metadata is being allocated */ 191 #define EXT4_MB_HINT_METADATA 0x0004 192 /* first blocks in the file */ 193 #define EXT4_MB_HINT_FIRST 0x0008 194 /* search for the best chunk */ 195 #define EXT4_MB_HINT_BEST 0x0010 196 /* data is being allocated */ 197 #define EXT4_MB_HINT_DATA 0x0020 198 /* don't preallocate (for tails) */ 199 #define EXT4_MB_HINT_NOPREALLOC 0x0040 200 /* allocate for locality group */ 201 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 202 /* allocate goal blocks or none */ 203 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 204 /* goal is meaningful */ 205 #define EXT4_MB_HINT_TRY_GOAL 0x0200 206 /* blocks already pre-reserved by delayed allocation */ 207 #define EXT4_MB_DELALLOC_RESERVED 0x0400 208 /* We are doing stream allocation */ 209 #define EXT4_MB_STREAM_ALLOC 0x0800 210 /* Use reserved root blocks if needed */ 211 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 212 /* Use blocks from reserved pool */ 213 #define EXT4_MB_USE_RESERVED 0x2000 214 /* Do strict check for free blocks while retrying block allocation */ 215 #define EXT4_MB_STRICT_CHECK 0x4000 216 /* Large fragment size list lookup succeeded at least once for cr = 0 */ 217 #define EXT4_MB_CR_POWER2_ALIGNED_OPTIMIZED 0x8000 218 /* Avg fragment size rb tree lookup succeeded at least once for cr = 1 */ 219 #define EXT4_MB_CR_GOAL_LEN_FAST_OPTIMIZED 0x00010000 220 /* Avg fragment size rb tree lookup succeeded at least once for cr = 1.5 */ 221 #define EXT4_MB_CR_BEST_AVAIL_LEN_OPTIMIZED 0x00020000 222 223 struct ext4_allocation_request { 224 /* target inode for block we're allocating */ 225 struct inode *inode; 226 /* how many blocks we want to allocate */ 227 unsigned int len; 228 /* logical block in target inode */ 229 ext4_lblk_t logical; 230 /* the closest logical allocated block to the left */ 231 ext4_lblk_t lleft; 232 /* the closest logical allocated block to the right */ 233 ext4_lblk_t lright; 234 /* phys. target (a hint) */ 235 ext4_fsblk_t goal; 236 /* phys. block for the closest logical allocated block to the left */ 237 ext4_fsblk_t pleft; 238 /* phys. block for the closest logical allocated block to the right */ 239 ext4_fsblk_t pright; 240 /* flags. see above EXT4_MB_HINT_* */ 241 unsigned int flags; 242 }; 243 244 /* 245 * Logical to physical block mapping, used by ext4_map_blocks() 246 * 247 * This structure is used to pass requests into ext4_map_blocks() as 248 * well as to store the information returned by ext4_map_blocks(). It 249 * takes less room on the stack than a struct buffer_head. 250 */ 251 #define EXT4_MAP_NEW BIT(BH_New) 252 #define EXT4_MAP_MAPPED BIT(BH_Mapped) 253 #define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten) 254 #define EXT4_MAP_BOUNDARY BIT(BH_Boundary) 255 #define EXT4_MAP_DELAYED BIT(BH_Delay) 256 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 257 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\ 258 EXT4_MAP_DELAYED) 259 260 struct ext4_map_blocks { 261 ext4_fsblk_t m_pblk; 262 ext4_lblk_t m_lblk; 263 unsigned int m_len; 264 unsigned int m_flags; 265 }; 266 267 /* 268 * Block validity checking, system zone rbtree. 269 */ 270 struct ext4_system_blocks { 271 struct rb_root root; 272 struct rcu_head rcu; 273 }; 274 275 /* 276 * Flags for ext4_io_end->flags 277 */ 278 #define EXT4_IO_END_UNWRITTEN 0x0001 279 280 struct ext4_io_end_vec { 281 struct list_head list; /* list of io_end_vec */ 282 loff_t offset; /* offset in the file */ 283 ssize_t size; /* size of the extent */ 284 }; 285 286 /* 287 * For converting unwritten extents on a work queue. 'handle' is used for 288 * buffered writeback. 289 */ 290 typedef struct ext4_io_end { 291 struct list_head list; /* per-file finished IO list */ 292 handle_t *handle; /* handle reserved for extent 293 * conversion */ 294 struct inode *inode; /* file being written to */ 295 struct bio *bio; /* Linked list of completed 296 * bios covering the extent */ 297 unsigned int flag; /* unwritten or not */ 298 refcount_t count; /* reference counter */ 299 struct list_head list_vec; /* list of ext4_io_end_vec */ 300 } ext4_io_end_t; 301 302 struct ext4_io_submit { 303 struct writeback_control *io_wbc; 304 struct bio *io_bio; 305 ext4_io_end_t *io_end; 306 sector_t io_next_block; 307 }; 308 309 /* 310 * Special inodes numbers 311 */ 312 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 313 #define EXT4_ROOT_INO 2 /* Root inode */ 314 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 315 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 316 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 317 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 318 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 319 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 320 321 /* First non-reserved inode for old ext4 filesystems */ 322 #define EXT4_GOOD_OLD_FIRST_INO 11 323 324 /* 325 * Maximal count of links to a file 326 */ 327 #define EXT4_LINK_MAX 65000 328 329 /* 330 * Macro-instructions used to manage several block sizes 331 */ 332 #define EXT4_MIN_BLOCK_SIZE 1024 333 #define EXT4_MAX_BLOCK_SIZE 65536 334 #define EXT4_MIN_BLOCK_LOG_SIZE 10 335 #define EXT4_MAX_BLOCK_LOG_SIZE 16 336 #define EXT4_MAX_CLUSTER_LOG_SIZE 30 337 #ifdef __KERNEL__ 338 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 339 #else 340 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 341 #endif 342 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 343 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 344 EXT4_SB(s)->s_cluster_bits) 345 #ifdef __KERNEL__ 346 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 347 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 348 #else 349 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 350 #endif 351 #ifdef __KERNEL__ 352 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 353 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 354 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 355 #else 356 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 357 EXT4_GOOD_OLD_INODE_SIZE : \ 358 (s)->s_inode_size) 359 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 360 EXT4_GOOD_OLD_FIRST_INO : \ 361 (s)->s_first_ino) 362 #endif 363 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 364 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \ 365 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \ 366 blkbits)) 367 368 /* Translate a block number to a cluster number */ 369 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 370 /* Translate a cluster number to a block number */ 371 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 372 /* Translate # of blks to # of clusters */ 373 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 374 (sbi)->s_cluster_bits) 375 /* Mask out the low bits to get the starting block of the cluster */ 376 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 377 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 378 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 379 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 380 /* Fill in the low bits to get the last block of the cluster */ 381 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \ 382 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1)) 383 /* Get the cluster offset */ 384 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 385 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 386 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 387 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 388 389 /* 390 * Structure of a blocks group descriptor 391 */ 392 struct ext4_group_desc 393 { 394 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 395 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 396 __le32 bg_inode_table_lo; /* Inodes table block */ 397 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 398 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 399 __le16 bg_used_dirs_count_lo; /* Directories count */ 400 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 401 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 402 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 403 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 404 __le16 bg_itable_unused_lo; /* Unused inodes count */ 405 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 406 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 407 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 408 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 409 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 410 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 411 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 412 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 413 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 414 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 415 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 416 __u32 bg_reserved; 417 }; 418 419 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 420 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 421 sizeof(__le16)) 422 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 423 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 424 sizeof(__le16)) 425 426 /* 427 * Structure of a flex block group info 428 */ 429 430 struct flex_groups { 431 atomic64_t free_clusters; 432 atomic_t free_inodes; 433 atomic_t used_dirs; 434 }; 435 436 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 437 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 438 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 439 440 /* 441 * Macro-instructions used to manage group descriptors 442 */ 443 #define EXT4_MIN_DESC_SIZE 32 444 #define EXT4_MIN_DESC_SIZE_64BIT 64 445 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 446 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 447 #ifdef __KERNEL__ 448 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 449 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 450 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 451 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 452 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 453 #else 454 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 455 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 456 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 457 #endif 458 459 /* 460 * Constants relative to the data blocks 461 */ 462 #define EXT4_NDIR_BLOCKS 12 463 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 464 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 465 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 466 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 467 468 /* 469 * Inode flags 470 */ 471 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 472 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 473 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 474 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 475 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 476 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 477 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 478 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 479 /* Reserved for compression usage... */ 480 #define EXT4_DIRTY_FL 0x00000100 481 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 482 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 483 /* nb: was previously EXT2_ECOMPR_FL */ 484 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 485 /* End compression flags --- maybe not all used */ 486 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 487 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 488 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 489 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 490 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 491 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 492 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 493 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 494 #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */ 495 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 496 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */ 497 498 #define EXT4_DAX_FL 0x02000000 /* Inode is DAX */ 499 500 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 501 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 502 #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */ 503 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 504 505 /* User modifiable flags */ 506 #define EXT4_FL_USER_MODIFIABLE (EXT4_SECRM_FL | \ 507 EXT4_UNRM_FL | \ 508 EXT4_COMPR_FL | \ 509 EXT4_SYNC_FL | \ 510 EXT4_IMMUTABLE_FL | \ 511 EXT4_APPEND_FL | \ 512 EXT4_NODUMP_FL | \ 513 EXT4_NOATIME_FL | \ 514 EXT4_JOURNAL_DATA_FL | \ 515 EXT4_NOTAIL_FL | \ 516 EXT4_DIRSYNC_FL | \ 517 EXT4_TOPDIR_FL | \ 518 EXT4_EXTENTS_FL | \ 519 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \ 520 EXT4_DAX_FL | \ 521 EXT4_PROJINHERIT_FL | \ 522 EXT4_CASEFOLD_FL) 523 524 /* User visible flags */ 525 #define EXT4_FL_USER_VISIBLE (EXT4_FL_USER_MODIFIABLE | \ 526 EXT4_DIRTY_FL | \ 527 EXT4_COMPRBLK_FL | \ 528 EXT4_NOCOMPR_FL | \ 529 EXT4_ENCRYPT_FL | \ 530 EXT4_INDEX_FL | \ 531 EXT4_VERITY_FL | \ 532 EXT4_INLINE_DATA_FL) 533 534 /* Flags that should be inherited by new inodes from their parent. */ 535 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 536 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 537 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 538 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 539 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\ 540 EXT4_DAX_FL) 541 542 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 543 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\ 544 EXT4_PROJINHERIT_FL)) 545 546 /* Flags that are appropriate for non-directories/regular files. */ 547 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 548 549 /* The only flags that should be swapped */ 550 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL) 551 552 /* Flags which are mutually exclusive to DAX */ 553 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\ 554 EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL) 555 556 /* Mask out flags that are inappropriate for the given type of inode. */ 557 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 558 { 559 if (S_ISDIR(mode)) 560 return flags; 561 else if (S_ISREG(mode)) 562 return flags & EXT4_REG_FLMASK; 563 else 564 return flags & EXT4_OTHER_FLMASK; 565 } 566 567 /* 568 * Inode flags used for atomic set/get 569 */ 570 enum { 571 EXT4_INODE_SECRM = 0, /* Secure deletion */ 572 EXT4_INODE_UNRM = 1, /* Undelete */ 573 EXT4_INODE_COMPR = 2, /* Compress file */ 574 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 575 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 576 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 577 EXT4_INODE_NODUMP = 6, /* do not dump file */ 578 EXT4_INODE_NOATIME = 7, /* do not update atime */ 579 /* Reserved for compression usage... */ 580 EXT4_INODE_DIRTY = 8, 581 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 582 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 583 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 584 /* End compression flags --- maybe not all used */ 585 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 586 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 587 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 588 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 589 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 590 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 591 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 592 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 593 EXT4_INODE_VERITY = 20, /* Verity protected inode */ 594 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 595 /* 22 was formerly EXT4_INODE_EOFBLOCKS */ 596 EXT4_INODE_DAX = 25, /* Inode is DAX */ 597 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 598 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 599 EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */ 600 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 601 }; 602 603 /* 604 * Since it's pretty easy to mix up bit numbers and hex values, we use a 605 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 606 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 607 * any extra space in the compiled kernel image, otherwise, the build will fail. 608 * It's important that these values are the same, since we are using 609 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 610 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 611 * values found in ext2, ext3 and ext4 filesystems, and of course the values 612 * defined in e2fsprogs. 613 * 614 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 615 */ 616 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1U << EXT4_INODE_##FLAG)) 617 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 618 619 static inline void ext4_check_flag_values(void) 620 { 621 CHECK_FLAG_VALUE(SECRM); 622 CHECK_FLAG_VALUE(UNRM); 623 CHECK_FLAG_VALUE(COMPR); 624 CHECK_FLAG_VALUE(SYNC); 625 CHECK_FLAG_VALUE(IMMUTABLE); 626 CHECK_FLAG_VALUE(APPEND); 627 CHECK_FLAG_VALUE(NODUMP); 628 CHECK_FLAG_VALUE(NOATIME); 629 CHECK_FLAG_VALUE(DIRTY); 630 CHECK_FLAG_VALUE(COMPRBLK); 631 CHECK_FLAG_VALUE(NOCOMPR); 632 CHECK_FLAG_VALUE(ENCRYPT); 633 CHECK_FLAG_VALUE(INDEX); 634 CHECK_FLAG_VALUE(IMAGIC); 635 CHECK_FLAG_VALUE(JOURNAL_DATA); 636 CHECK_FLAG_VALUE(NOTAIL); 637 CHECK_FLAG_VALUE(DIRSYNC); 638 CHECK_FLAG_VALUE(TOPDIR); 639 CHECK_FLAG_VALUE(HUGE_FILE); 640 CHECK_FLAG_VALUE(EXTENTS); 641 CHECK_FLAG_VALUE(VERITY); 642 CHECK_FLAG_VALUE(EA_INODE); 643 CHECK_FLAG_VALUE(INLINE_DATA); 644 CHECK_FLAG_VALUE(PROJINHERIT); 645 CHECK_FLAG_VALUE(CASEFOLD); 646 CHECK_FLAG_VALUE(RESERVED); 647 } 648 649 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 650 struct compat_ext4_new_group_input { 651 u32 group; 652 compat_u64 block_bitmap; 653 compat_u64 inode_bitmap; 654 compat_u64 inode_table; 655 u32 blocks_count; 656 u16 reserved_blocks; 657 u16 unused; 658 }; 659 #endif 660 661 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 662 struct ext4_new_group_data { 663 __u32 group; 664 __u64 block_bitmap; 665 __u64 inode_bitmap; 666 __u64 inode_table; 667 __u32 blocks_count; 668 __u16 reserved_blocks; 669 __u16 mdata_blocks; 670 __u32 free_clusters_count; 671 }; 672 673 /* Indexes used to index group tables in ext4_new_group_data */ 674 enum { 675 BLOCK_BITMAP = 0, /* block bitmap */ 676 INODE_BITMAP, /* inode bitmap */ 677 INODE_TABLE, /* inode tables */ 678 GROUP_TABLE_COUNT, 679 }; 680 681 /* 682 * Flags used by ext4_map_blocks() 683 */ 684 /* Allocate any needed blocks and/or convert an unwritten 685 extent to be an initialized ext4 */ 686 #define EXT4_GET_BLOCKS_CREATE 0x0001 687 /* Request the creation of an unwritten extent */ 688 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 689 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 690 EXT4_GET_BLOCKS_CREATE) 691 /* Caller is from the delayed allocation writeout path 692 * finally doing the actual allocation of delayed blocks */ 693 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 694 /* caller is from the direct IO path, request to creation of an 695 unwritten extents if not allocated, split the unwritten 696 extent if blocks has been preallocated already*/ 697 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 698 #define EXT4_GET_BLOCKS_CONVERT 0x0010 699 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 700 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 701 /* Convert extent to initialized after IO complete */ 702 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 703 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 704 /* Eventual metadata allocation (due to growing extent tree) 705 * should not fail, so try to use reserved blocks for that.*/ 706 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 707 /* Don't normalize allocation size (used for fallocate) */ 708 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 709 /* Convert written extents to unwritten */ 710 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 711 /* Write zeros to newly created written extents */ 712 #define EXT4_GET_BLOCKS_ZERO 0x0200 713 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 714 EXT4_GET_BLOCKS_ZERO) 715 /* Caller will submit data before dropping transaction handle. This 716 * allows jbd2 to avoid submitting data before commit. */ 717 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 718 /* Caller is in the atomic contex, find extent if it has been cached */ 719 #define EXT4_GET_BLOCKS_CACHED_NOWAIT 0x0800 720 721 /* 722 * The bit position of these flags must not overlap with any of the 723 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 724 * read_extent_tree_block(), ext4_split_extent_at(), 725 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 726 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 727 * caching the extents when reading from the extent tree while a 728 * truncate or punch hole operation is in progress. 729 */ 730 #define EXT4_EX_NOCACHE 0x40000000 731 #define EXT4_EX_FORCE_CACHE 0x20000000 732 #define EXT4_EX_NOFAIL 0x10000000 733 734 /* 735 * Flags used by ext4_free_blocks 736 */ 737 #define EXT4_FREE_BLOCKS_METADATA 0x0001 738 #define EXT4_FREE_BLOCKS_FORGET 0x0002 739 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 740 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 741 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 742 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 743 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040 744 745 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 746 /* 747 * ioctl commands in 32 bit emulation 748 */ 749 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 750 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 751 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 752 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 753 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 754 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 755 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 756 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 757 #endif 758 759 /* Max physical block we can address w/o extents */ 760 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 761 762 /* Max logical block we can support */ 763 #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE 764 765 /* 766 * Structure of an inode on the disk 767 */ 768 struct ext4_inode { 769 __le16 i_mode; /* File mode */ 770 __le16 i_uid; /* Low 16 bits of Owner Uid */ 771 __le32 i_size_lo; /* Size in bytes */ 772 __le32 i_atime; /* Access time */ 773 __le32 i_ctime; /* Inode Change time */ 774 __le32 i_mtime; /* Modification time */ 775 __le32 i_dtime; /* Deletion Time */ 776 __le16 i_gid; /* Low 16 bits of Group Id */ 777 __le16 i_links_count; /* Links count */ 778 __le32 i_blocks_lo; /* Blocks count */ 779 __le32 i_flags; /* File flags */ 780 union { 781 struct { 782 __le32 l_i_version; 783 } linux1; 784 struct { 785 __u32 h_i_translator; 786 } hurd1; 787 struct { 788 __u32 m_i_reserved1; 789 } masix1; 790 } osd1; /* OS dependent 1 */ 791 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 792 __le32 i_generation; /* File version (for NFS) */ 793 __le32 i_file_acl_lo; /* File ACL */ 794 __le32 i_size_high; 795 __le32 i_obso_faddr; /* Obsoleted fragment address */ 796 union { 797 struct { 798 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 799 __le16 l_i_file_acl_high; 800 __le16 l_i_uid_high; /* these 2 fields */ 801 __le16 l_i_gid_high; /* were reserved2[0] */ 802 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 803 __le16 l_i_reserved; 804 } linux2; 805 struct { 806 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 807 __u16 h_i_mode_high; 808 __u16 h_i_uid_high; 809 __u16 h_i_gid_high; 810 __u32 h_i_author; 811 } hurd2; 812 struct { 813 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 814 __le16 m_i_file_acl_high; 815 __u32 m_i_reserved2[2]; 816 } masix2; 817 } osd2; /* OS dependent 2 */ 818 __le16 i_extra_isize; 819 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 820 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 821 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 822 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 823 __le32 i_crtime; /* File Creation time */ 824 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 825 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 826 __le32 i_projid; /* Project ID */ 827 }; 828 829 #define EXT4_EPOCH_BITS 2 830 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 831 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 832 833 /* 834 * Extended fields will fit into an inode if the filesystem was formatted 835 * with large inodes (-I 256 or larger) and there are not currently any EAs 836 * consuming all of the available space. For new inodes we always reserve 837 * enough space for the kernel's known extended fields, but for inodes 838 * created with an old kernel this might not have been the case. None of 839 * the extended inode fields is critical for correct filesystem operation. 840 * This macro checks if a certain field fits in the inode. Note that 841 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 842 */ 843 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 844 ((offsetof(typeof(*ext4_inode), field) + \ 845 sizeof((ext4_inode)->field)) \ 846 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 847 (einode)->i_extra_isize)) \ 848 849 /* 850 * We use an encoding that preserves the times for extra epoch "00": 851 * 852 * extra msb of adjust for signed 853 * epoch 32-bit 32-bit tv_sec to 854 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 855 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 856 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 857 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 858 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 859 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 860 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 861 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 862 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 863 * 864 * Note that previous versions of the kernel on 64-bit systems would 865 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 866 * 1970. e2fsck will correct this, assuming that it is run on the 867 * affected filesystem before 2242. 868 */ 869 870 static inline __le32 ext4_encode_extra_time(struct timespec64 ts) 871 { 872 u32 extra = ((ts.tv_sec - (s32)ts.tv_sec) >> 32) & EXT4_EPOCH_MASK; 873 return cpu_to_le32(extra | (ts.tv_nsec << EXT4_EPOCH_BITS)); 874 } 875 876 static inline struct timespec64 ext4_decode_extra_time(__le32 base, 877 __le32 extra) 878 { 879 struct timespec64 ts = { .tv_sec = (signed)le32_to_cpu(base) }; 880 881 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) 882 ts.tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 883 ts.tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 884 return ts; 885 } 886 887 #define EXT4_INODE_SET_XTIME_VAL(xtime, inode, raw_inode, ts) \ 888 do { \ 889 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \ 890 (raw_inode)->xtime = cpu_to_le32((ts).tv_sec); \ 891 (raw_inode)->xtime ## _extra = ext4_encode_extra_time(ts); \ 892 } else \ 893 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (ts).tv_sec, S32_MIN, S32_MAX)); \ 894 } while (0) 895 896 #define EXT4_INODE_SET_ATIME(inode, raw_inode) \ 897 EXT4_INODE_SET_XTIME_VAL(i_atime, inode, raw_inode, inode_get_atime(inode)) 898 899 #define EXT4_INODE_SET_MTIME(inode, raw_inode) \ 900 EXT4_INODE_SET_XTIME_VAL(i_mtime, inode, raw_inode, inode_get_mtime(inode)) 901 902 #define EXT4_INODE_SET_CTIME(inode, raw_inode) \ 903 EXT4_INODE_SET_XTIME_VAL(i_ctime, inode, raw_inode, inode_get_ctime(inode)) 904 905 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 906 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 907 EXT4_INODE_SET_XTIME_VAL(xtime, &((einode)->vfs_inode), \ 908 raw_inode, (einode)->xtime) 909 910 #define EXT4_INODE_GET_XTIME_VAL(xtime, inode, raw_inode) \ 911 (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra) ? \ 912 ext4_decode_extra_time((raw_inode)->xtime, \ 913 (raw_inode)->xtime ## _extra) : \ 914 (struct timespec64) { \ 915 .tv_sec = (signed)le32_to_cpu((raw_inode)->xtime) \ 916 }) 917 918 #define EXT4_INODE_GET_ATIME(inode, raw_inode) \ 919 do { \ 920 inode_set_atime_to_ts(inode, \ 921 EXT4_INODE_GET_XTIME_VAL(i_atime, inode, raw_inode)); \ 922 } while (0) 923 924 #define EXT4_INODE_GET_MTIME(inode, raw_inode) \ 925 do { \ 926 inode_set_mtime_to_ts(inode, \ 927 EXT4_INODE_GET_XTIME_VAL(i_mtime, inode, raw_inode)); \ 928 } while (0) 929 930 #define EXT4_INODE_GET_CTIME(inode, raw_inode) \ 931 do { \ 932 inode_set_ctime_to_ts(inode, \ 933 EXT4_INODE_GET_XTIME_VAL(i_ctime, inode, raw_inode)); \ 934 } while (0) 935 936 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 937 do { \ 938 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 939 (einode)->xtime = \ 940 EXT4_INODE_GET_XTIME_VAL(xtime, &(einode->vfs_inode), \ 941 raw_inode); \ 942 else \ 943 (einode)->xtime = (struct timespec64){0, 0}; \ 944 } while (0) 945 946 #define i_disk_version osd1.linux1.l_i_version 947 948 #if defined(__KERNEL__) || defined(__linux__) 949 #define i_reserved1 osd1.linux1.l_i_reserved1 950 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 951 #define i_blocks_high osd2.linux2.l_i_blocks_high 952 #define i_uid_low i_uid 953 #define i_gid_low i_gid 954 #define i_uid_high osd2.linux2.l_i_uid_high 955 #define i_gid_high osd2.linux2.l_i_gid_high 956 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 957 958 #elif defined(__GNU__) 959 960 #define i_translator osd1.hurd1.h_i_translator 961 #define i_uid_high osd2.hurd2.h_i_uid_high 962 #define i_gid_high osd2.hurd2.h_i_gid_high 963 #define i_author osd2.hurd2.h_i_author 964 965 #elif defined(__masix__) 966 967 #define i_reserved1 osd1.masix1.m_i_reserved1 968 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 969 #define i_reserved2 osd2.masix2.m_i_reserved2 970 971 #endif /* defined(__KERNEL__) || defined(__linux__) */ 972 973 #include "extents_status.h" 974 #include "fast_commit.h" 975 976 /* 977 * Lock subclasses for i_data_sem in the ext4_inode_info structure. 978 * 979 * These are needed to avoid lockdep false positives when we need to 980 * allocate blocks to the quota inode during ext4_map_blocks(), while 981 * holding i_data_sem for a normal (non-quota) inode. Since we don't 982 * do quota tracking for the quota inode, this avoids deadlock (as 983 * well as infinite recursion, since it isn't turtles all the way 984 * down...) 985 * 986 * I_DATA_SEM_NORMAL - Used for most inodes 987 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode 988 * where the second inode has larger inode number 989 * than the first 990 * I_DATA_SEM_QUOTA - Used for quota inodes only 991 * I_DATA_SEM_EA - Used for ea_inodes only 992 */ 993 enum { 994 I_DATA_SEM_NORMAL = 0, 995 I_DATA_SEM_OTHER, 996 I_DATA_SEM_QUOTA, 997 I_DATA_SEM_EA 998 }; 999 1000 1001 /* 1002 * fourth extended file system inode data in memory 1003 */ 1004 struct ext4_inode_info { 1005 __le32 i_data[15]; /* unconverted */ 1006 __u32 i_dtime; 1007 ext4_fsblk_t i_file_acl; 1008 1009 /* 1010 * i_block_group is the number of the block group which contains 1011 * this file's inode. Constant across the lifetime of the inode, 1012 * it is used for making block allocation decisions - we try to 1013 * place a file's data blocks near its inode block, and new inodes 1014 * near to their parent directory's inode. 1015 */ 1016 ext4_group_t i_block_group; 1017 ext4_lblk_t i_dir_start_lookup; 1018 #if (BITS_PER_LONG < 64) 1019 unsigned long i_state_flags; /* Dynamic state flags */ 1020 #endif 1021 unsigned long i_flags; 1022 1023 /* 1024 * Extended attributes can be read independently of the main file 1025 * data. Taking i_rwsem even when reading would cause contention 1026 * between readers of EAs and writers of regular file data, so 1027 * instead we synchronize on xattr_sem when reading or changing 1028 * EAs. 1029 */ 1030 struct rw_semaphore xattr_sem; 1031 1032 /* 1033 * Inodes with EXT4_STATE_ORPHAN_FILE use i_orphan_idx. Otherwise 1034 * i_orphan is used. 1035 */ 1036 union { 1037 struct list_head i_orphan; /* unlinked but open inodes */ 1038 unsigned int i_orphan_idx; /* Index in orphan file */ 1039 }; 1040 1041 /* Fast commit related info */ 1042 1043 /* For tracking dentry create updates */ 1044 struct list_head i_fc_dilist; 1045 struct list_head i_fc_list; /* 1046 * inodes that need fast commit 1047 * protected by sbi->s_fc_lock. 1048 */ 1049 1050 /* Start of lblk range that needs to be committed in this fast commit */ 1051 ext4_lblk_t i_fc_lblk_start; 1052 1053 /* End of lblk range that needs to be committed in this fast commit */ 1054 ext4_lblk_t i_fc_lblk_len; 1055 1056 /* Number of ongoing updates on this inode */ 1057 atomic_t i_fc_updates; 1058 1059 /* Fast commit wait queue for this inode */ 1060 wait_queue_head_t i_fc_wait; 1061 1062 /* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */ 1063 struct mutex i_fc_lock; 1064 1065 /* 1066 * i_disksize keeps track of what the inode size is ON DISK, not 1067 * in memory. During truncate, i_size is set to the new size by 1068 * the VFS prior to calling ext4_truncate(), but the filesystem won't 1069 * set i_disksize to 0 until the truncate is actually under way. 1070 * 1071 * The intent is that i_disksize always represents the blocks which 1072 * are used by this file. This allows recovery to restart truncate 1073 * on orphans if we crash during truncate. We actually write i_disksize 1074 * into the on-disk inode when writing inodes out, instead of i_size. 1075 * 1076 * The only time when i_disksize and i_size may be different is when 1077 * a truncate is in progress. The only things which change i_disksize 1078 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 1079 */ 1080 loff_t i_disksize; 1081 1082 /* 1083 * i_data_sem is for serialising ext4_truncate() against 1084 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 1085 * data tree are chopped off during truncate. We can't do that in 1086 * ext4 because whenever we perform intermediate commits during 1087 * truncate, the inode and all the metadata blocks *must* be in a 1088 * consistent state which allows truncation of the orphans to restart 1089 * during recovery. Hence we must fix the get_block-vs-truncate race 1090 * by other means, so we have i_data_sem. 1091 */ 1092 struct rw_semaphore i_data_sem; 1093 struct inode vfs_inode; 1094 struct jbd2_inode *jinode; 1095 1096 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 1097 1098 /* 1099 * File creation time. Its function is same as that of 1100 * struct timespec64 i_{a,c,m}time in the generic inode. 1101 */ 1102 struct timespec64 i_crtime; 1103 1104 /* mballoc */ 1105 atomic_t i_prealloc_active; 1106 struct rb_root i_prealloc_node; 1107 rwlock_t i_prealloc_lock; 1108 1109 /* extents status tree */ 1110 struct ext4_es_tree i_es_tree; 1111 rwlock_t i_es_lock; 1112 struct list_head i_es_list; 1113 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1114 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1115 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1116 extents to shrink. Protected by 1117 i_es_lock */ 1118 1119 /* ialloc */ 1120 ext4_group_t i_last_alloc_group; 1121 1122 /* allocation reservation info for delalloc */ 1123 /* In case of bigalloc, this refer to clusters rather than blocks */ 1124 unsigned int i_reserved_data_blocks; 1125 1126 /* pending cluster reservations for bigalloc file systems */ 1127 struct ext4_pending_tree i_pending_tree; 1128 1129 /* on-disk additional length */ 1130 __u16 i_extra_isize; 1131 1132 /* Indicate the inline data space. */ 1133 u16 i_inline_off; 1134 u16 i_inline_size; 1135 1136 #ifdef CONFIG_QUOTA 1137 /* quota space reservation, managed internally by quota code */ 1138 qsize_t i_reserved_quota; 1139 #endif 1140 1141 /* Lock protecting lists below */ 1142 spinlock_t i_completed_io_lock; 1143 /* 1144 * Completed IOs that need unwritten extents handling and have 1145 * transaction reserved 1146 */ 1147 struct list_head i_rsv_conversion_list; 1148 struct work_struct i_rsv_conversion_work; 1149 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 1150 1151 spinlock_t i_block_reservation_lock; 1152 1153 /* 1154 * Transactions that contain inode's metadata needed to complete 1155 * fsync and fdatasync, respectively. 1156 */ 1157 tid_t i_sync_tid; 1158 tid_t i_datasync_tid; 1159 1160 #ifdef CONFIG_QUOTA 1161 struct dquot __rcu *i_dquot[MAXQUOTAS]; 1162 #endif 1163 1164 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1165 __u32 i_csum_seed; 1166 1167 kprojid_t i_projid; 1168 }; 1169 1170 /* 1171 * File system states 1172 */ 1173 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1174 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1175 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1176 #define EXT4_FC_REPLAY 0x0020 /* Fast commit replay ongoing */ 1177 1178 /* 1179 * Misc. filesystem flags 1180 */ 1181 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1182 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1183 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1184 1185 /* 1186 * Mount flags set via mount options or defaults 1187 */ 1188 #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */ 1189 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1190 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1191 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1192 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1193 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1194 #define EXT4_MOUNT_ERRORS_MASK 0x00070 1195 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1196 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1197 #ifdef CONFIG_FS_DAX 1198 #define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */ 1199 #else 1200 #define EXT4_MOUNT_DAX_ALWAYS 0 1201 #endif 1202 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1203 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1204 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1205 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1206 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1207 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1208 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1209 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1210 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1211 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1212 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */ 1213 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota, 1214 * enable enforcement for hidden 1215 * quota files */ 1216 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable 1217 * enforcement for hidden quota 1218 * files */ 1219 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota 1220 * enforcement */ 1221 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1222 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1223 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1224 #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */ 1225 #define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000 1226 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1227 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1228 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1229 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1230 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1231 1232 /* 1233 * Mount flags set either automatically (could not be set by mount option) 1234 * based on per file system feature or property or in special cases such as 1235 * distinguishing between explicit mount option definition and default. 1236 */ 1237 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1238 specified delalloc */ 1239 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1240 size of blocksize * 8 1241 blocks */ 1242 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1243 file systems */ 1244 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1245 specified journal checksum */ 1246 1247 #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */ 1248 #define EXT4_MOUNT2_DAX_NEVER 0x00000020 /* Do not allow Direct Access */ 1249 #define EXT4_MOUNT2_DAX_INODE 0x00000040 /* For printing options only */ 1250 #define EXT4_MOUNT2_MB_OPTIMIZE_SCAN 0x00000080 /* Optimize group 1251 * scanning in mballoc 1252 */ 1253 #define EXT4_MOUNT2_ABORT 0x00000100 /* Abort filesystem */ 1254 1255 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1256 ~EXT4_MOUNT_##opt 1257 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1258 EXT4_MOUNT_##opt 1259 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1260 EXT4_MOUNT_##opt) 1261 1262 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1263 ~EXT4_MOUNT2_##opt 1264 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1265 EXT4_MOUNT2_##opt 1266 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1267 EXT4_MOUNT2_##opt) 1268 1269 #define ext4_test_and_set_bit __test_and_set_bit_le 1270 #define ext4_set_bit __set_bit_le 1271 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1272 #define ext4_clear_bit __clear_bit_le 1273 #define ext4_test_bit test_bit_le 1274 #define ext4_find_next_zero_bit find_next_zero_bit_le 1275 #define ext4_find_next_bit find_next_bit_le 1276 1277 extern void mb_set_bits(void *bm, int cur, int len); 1278 1279 /* 1280 * Maximal mount counts between two filesystem checks 1281 */ 1282 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1283 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1284 1285 /* 1286 * Behaviour when detecting errors 1287 */ 1288 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1289 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1290 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1291 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1292 1293 /* Metadata checksum algorithm codes */ 1294 #define EXT4_CRC32C_CHKSUM 1 1295 1296 #define EXT4_LABEL_MAX 16 1297 1298 /* 1299 * Structure of the super block 1300 */ 1301 struct ext4_super_block { 1302 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1303 __le32 s_blocks_count_lo; /* Blocks count */ 1304 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1305 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1306 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1307 __le32 s_first_data_block; /* First Data Block */ 1308 __le32 s_log_block_size; /* Block size */ 1309 __le32 s_log_cluster_size; /* Allocation cluster size */ 1310 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1311 __le32 s_clusters_per_group; /* # Clusters per group */ 1312 __le32 s_inodes_per_group; /* # Inodes per group */ 1313 __le32 s_mtime; /* Mount time */ 1314 /*30*/ __le32 s_wtime; /* Write time */ 1315 __le16 s_mnt_count; /* Mount count */ 1316 __le16 s_max_mnt_count; /* Maximal mount count */ 1317 __le16 s_magic; /* Magic signature */ 1318 __le16 s_state; /* File system state */ 1319 __le16 s_errors; /* Behaviour when detecting errors */ 1320 __le16 s_minor_rev_level; /* minor revision level */ 1321 /*40*/ __le32 s_lastcheck; /* time of last check */ 1322 __le32 s_checkinterval; /* max. time between checks */ 1323 __le32 s_creator_os; /* OS */ 1324 __le32 s_rev_level; /* Revision level */ 1325 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1326 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1327 /* 1328 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1329 * 1330 * Note: the difference between the compatible feature set and 1331 * the incompatible feature set is that if there is a bit set 1332 * in the incompatible feature set that the kernel doesn't 1333 * know about, it should refuse to mount the filesystem. 1334 * 1335 * e2fsck's requirements are more strict; if it doesn't know 1336 * about a feature in either the compatible or incompatible 1337 * feature set, it must abort and not try to meddle with 1338 * things it doesn't understand... 1339 */ 1340 __le32 s_first_ino; /* First non-reserved inode */ 1341 __le16 s_inode_size; /* size of inode structure */ 1342 __le16 s_block_group_nr; /* block group # of this superblock */ 1343 __le32 s_feature_compat; /* compatible feature set */ 1344 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1345 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1346 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1347 /*78*/ char s_volume_name[EXT4_LABEL_MAX]; /* volume name */ 1348 /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */ 1349 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1350 /* 1351 * Performance hints. Directory preallocation should only 1352 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1353 */ 1354 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1355 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1356 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1357 /* 1358 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1359 */ 1360 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1361 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1362 __le32 s_journal_dev; /* device number of journal file */ 1363 __le32 s_last_orphan; /* start of list of inodes to delete */ 1364 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1365 __u8 s_def_hash_version; /* Default hash version to use */ 1366 __u8 s_jnl_backup_type; 1367 __le16 s_desc_size; /* size of group descriptor */ 1368 /*100*/ __le32 s_default_mount_opts; 1369 __le32 s_first_meta_bg; /* First metablock block group */ 1370 __le32 s_mkfs_time; /* When the filesystem was created */ 1371 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1372 /* 64bit support valid if EXT4_FEATURE_INCOMPAT_64BIT */ 1373 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1374 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1375 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1376 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1377 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1378 __le32 s_flags; /* Miscellaneous flags */ 1379 __le16 s_raid_stride; /* RAID stride */ 1380 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1381 __le64 s_mmp_block; /* Block for multi-mount protection */ 1382 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1383 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1384 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1385 __u8 s_encryption_level; /* versioning level for encryption */ 1386 __u8 s_reserved_pad; /* Padding to next 32bits */ 1387 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1388 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1389 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1390 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1391 snapshot's future use */ 1392 __le32 s_snapshot_list; /* inode number of the head of the 1393 on-disk snapshot list */ 1394 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1395 __le32 s_error_count; /* number of fs errors */ 1396 __le32 s_first_error_time; /* first time an error happened */ 1397 __le32 s_first_error_ino; /* inode involved in first error */ 1398 __le64 s_first_error_block; /* block involved of first error */ 1399 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */ 1400 __le32 s_first_error_line; /* line number where error happened */ 1401 __le32 s_last_error_time; /* most recent time of an error */ 1402 __le32 s_last_error_ino; /* inode involved in last error */ 1403 __le32 s_last_error_line; /* line number where error happened */ 1404 __le64 s_last_error_block; /* block involved of last error */ 1405 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */ 1406 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1407 __u8 s_mount_opts[64]; 1408 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1409 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1410 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1411 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1412 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1413 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1414 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1415 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1416 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1417 __u8 s_wtime_hi; 1418 __u8 s_mtime_hi; 1419 __u8 s_mkfs_time_hi; 1420 __u8 s_lastcheck_hi; 1421 __u8 s_first_error_time_hi; 1422 __u8 s_last_error_time_hi; 1423 __u8 s_first_error_errcode; 1424 __u8 s_last_error_errcode; 1425 __le16 s_encoding; /* Filename charset encoding */ 1426 __le16 s_encoding_flags; /* Filename charset encoding flags */ 1427 __le32 s_orphan_file_inum; /* Inode for tracking orphan inodes */ 1428 __le32 s_reserved[94]; /* Padding to the end of the block */ 1429 __le32 s_checksum; /* crc32c(superblock) */ 1430 }; 1431 1432 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1433 1434 #ifdef __KERNEL__ 1435 1436 /* Number of quota types we support */ 1437 #define EXT4_MAXQUOTAS 3 1438 1439 #define EXT4_ENC_UTF8_12_1 1 1440 1441 /* Types of ext4 journal triggers */ 1442 enum ext4_journal_trigger_type { 1443 EXT4_JTR_ORPHAN_FILE, 1444 EXT4_JTR_NONE /* This must be the last entry for indexing to work! */ 1445 }; 1446 1447 #define EXT4_JOURNAL_TRIGGER_COUNT EXT4_JTR_NONE 1448 1449 struct ext4_journal_trigger { 1450 struct jbd2_buffer_trigger_type tr_triggers; 1451 struct super_block *sb; 1452 }; 1453 1454 static inline struct ext4_journal_trigger *EXT4_TRIGGER( 1455 struct jbd2_buffer_trigger_type *trigger) 1456 { 1457 return container_of(trigger, struct ext4_journal_trigger, tr_triggers); 1458 } 1459 1460 #define EXT4_ORPHAN_BLOCK_MAGIC 0x0b10ca04 1461 1462 /* Structure at the tail of orphan block */ 1463 struct ext4_orphan_block_tail { 1464 __le32 ob_magic; 1465 __le32 ob_checksum; 1466 }; 1467 1468 static inline int ext4_inodes_per_orphan_block(struct super_block *sb) 1469 { 1470 return (sb->s_blocksize - sizeof(struct ext4_orphan_block_tail)) / 1471 sizeof(u32); 1472 } 1473 1474 struct ext4_orphan_block { 1475 atomic_t ob_free_entries; /* Number of free orphan entries in block */ 1476 struct buffer_head *ob_bh; /* Buffer for orphan block */ 1477 }; 1478 1479 /* 1480 * Info about orphan file. 1481 */ 1482 struct ext4_orphan_info { 1483 int of_blocks; /* Number of orphan blocks in a file */ 1484 __u32 of_csum_seed; /* Checksum seed for orphan file */ 1485 struct ext4_orphan_block *of_binfo; /* Array with info about orphan 1486 * file blocks */ 1487 }; 1488 1489 /* 1490 * fourth extended-fs super-block data in memory 1491 */ 1492 struct ext4_sb_info { 1493 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1494 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1495 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1496 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1497 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1498 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1499 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1500 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1501 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1502 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1503 unsigned long s_overhead; /* # of fs overhead clusters */ 1504 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1505 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1506 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1507 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1508 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1509 /* Array of bh's for the block group descriptors */ 1510 struct buffer_head * __rcu *s_group_desc; 1511 unsigned int s_mount_opt; 1512 unsigned int s_mount_opt2; 1513 unsigned long s_mount_flags; 1514 unsigned int s_def_mount_opt; 1515 unsigned int s_def_mount_opt2; 1516 ext4_fsblk_t s_sb_block; 1517 atomic64_t s_resv_clusters; 1518 kuid_t s_resuid; 1519 kgid_t s_resgid; 1520 unsigned short s_mount_state; 1521 unsigned short s_pad; 1522 int s_addr_per_block_bits; 1523 int s_desc_per_block_bits; 1524 int s_inode_size; 1525 int s_first_ino; 1526 unsigned int s_inode_readahead_blks; 1527 unsigned int s_inode_goal; 1528 u32 s_hash_seed[4]; 1529 int s_def_hash_version; 1530 int s_hash_unsigned; /* 3 if hash should be unsigned, 0 if not */ 1531 struct percpu_counter s_freeclusters_counter; 1532 struct percpu_counter s_freeinodes_counter; 1533 struct percpu_counter s_dirs_counter; 1534 struct percpu_counter s_dirtyclusters_counter; 1535 struct percpu_counter s_sra_exceeded_retry_limit; 1536 struct blockgroup_lock *s_blockgroup_lock; 1537 struct proc_dir_entry *s_proc; 1538 struct kobject s_kobj; 1539 struct completion s_kobj_unregister; 1540 struct super_block *s_sb; 1541 struct buffer_head *s_mmp_bh; 1542 1543 /* Journaling */ 1544 struct journal_s *s_journal; 1545 unsigned long s_ext4_flags; /* Ext4 superblock flags */ 1546 struct mutex s_orphan_lock; /* Protects on disk list changes */ 1547 struct list_head s_orphan; /* List of orphaned inodes in on disk 1548 list */ 1549 struct ext4_orphan_info s_orphan_info; 1550 unsigned long s_commit_interval; 1551 u32 s_max_batch_time; 1552 u32 s_min_batch_time; 1553 struct file *s_journal_bdev_file; 1554 #ifdef CONFIG_QUOTA 1555 /* Names of quota files with journalled quota */ 1556 char __rcu *s_qf_names[EXT4_MAXQUOTAS]; 1557 int s_jquota_fmt; /* Format of quota to use */ 1558 #endif 1559 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1560 struct ext4_system_blocks __rcu *s_system_blks; 1561 1562 #ifdef EXTENTS_STATS 1563 /* ext4 extents stats */ 1564 unsigned long s_ext_min; 1565 unsigned long s_ext_max; 1566 unsigned long s_depth_max; 1567 spinlock_t s_ext_stats_lock; 1568 unsigned long s_ext_blocks; 1569 unsigned long s_ext_extents; 1570 #endif 1571 1572 /* for buddy allocator */ 1573 struct ext4_group_info ** __rcu *s_group_info; 1574 struct inode *s_buddy_cache; 1575 spinlock_t s_md_lock; 1576 unsigned short *s_mb_offsets; 1577 unsigned int *s_mb_maxs; 1578 unsigned int s_group_info_size; 1579 unsigned int s_mb_free_pending; 1580 struct list_head s_freed_data_list[2]; /* List of blocks to be freed 1581 after commit completed */ 1582 struct list_head s_discard_list; 1583 struct work_struct s_discard_work; 1584 atomic_t s_retry_alloc_pending; 1585 struct list_head *s_mb_avg_fragment_size; 1586 rwlock_t *s_mb_avg_fragment_size_locks; 1587 struct list_head *s_mb_largest_free_orders; 1588 rwlock_t *s_mb_largest_free_orders_locks; 1589 1590 /* tunables */ 1591 unsigned long s_stripe; 1592 unsigned int s_mb_max_linear_groups; 1593 unsigned int s_mb_stream_request; 1594 unsigned int s_mb_max_to_scan; 1595 unsigned int s_mb_min_to_scan; 1596 unsigned int s_mb_stats; 1597 unsigned int s_mb_order2_reqs; 1598 unsigned int s_mb_group_prealloc; 1599 unsigned int s_max_dir_size_kb; 1600 /* where last allocation was done - for stream allocation */ 1601 unsigned long s_mb_last_group; 1602 unsigned long s_mb_last_start; 1603 unsigned int s_mb_prefetch; 1604 unsigned int s_mb_prefetch_limit; 1605 unsigned int s_mb_best_avail_max_trim_order; 1606 1607 /* stats for buddy allocator */ 1608 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1609 atomic_t s_bal_success; /* we found long enough chunks */ 1610 atomic_t s_bal_allocated; /* in blocks */ 1611 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1612 atomic_t s_bal_cX_ex_scanned[EXT4_MB_NUM_CRS]; /* total extents scanned */ 1613 atomic_t s_bal_groups_scanned; /* number of groups scanned */ 1614 atomic_t s_bal_goals; /* goal hits */ 1615 atomic_t s_bal_len_goals; /* len goal hits */ 1616 atomic_t s_bal_breaks; /* too long searches */ 1617 atomic_t s_bal_2orders; /* 2^order hits */ 1618 atomic_t s_bal_p2_aligned_bad_suggestions; 1619 atomic_t s_bal_goal_fast_bad_suggestions; 1620 atomic_t s_bal_best_avail_bad_suggestions; 1621 atomic64_t s_bal_cX_groups_considered[EXT4_MB_NUM_CRS]; 1622 atomic64_t s_bal_cX_hits[EXT4_MB_NUM_CRS]; 1623 atomic64_t s_bal_cX_failed[EXT4_MB_NUM_CRS]; /* cX loop didn't find blocks */ 1624 atomic_t s_mb_buddies_generated; /* number of buddies generated */ 1625 atomic64_t s_mb_generation_time; 1626 atomic_t s_mb_lost_chunks; 1627 atomic_t s_mb_preallocated; 1628 atomic_t s_mb_discarded; 1629 atomic_t s_lock_busy; 1630 1631 /* locality groups */ 1632 struct ext4_locality_group __percpu *s_locality_groups; 1633 1634 /* for write statistics */ 1635 unsigned long s_sectors_written_start; 1636 u64 s_kbytes_written; 1637 1638 /* the size of zero-out chunk */ 1639 unsigned int s_extent_max_zeroout_kb; 1640 1641 unsigned int s_log_groups_per_flex; 1642 struct flex_groups * __rcu *s_flex_groups; 1643 ext4_group_t s_flex_groups_allocated; 1644 1645 /* workqueue for reserved extent conversions (buffered io) */ 1646 struct workqueue_struct *rsv_conversion_wq; 1647 1648 /* timer for periodic error stats printing */ 1649 struct timer_list s_err_report; 1650 1651 /* Lazy inode table initialization info */ 1652 struct ext4_li_request *s_li_request; 1653 /* Wait multiplier for lazy initialization thread */ 1654 unsigned int s_li_wait_mult; 1655 1656 /* Kernel thread for multiple mount protection */ 1657 struct task_struct *s_mmp_tsk; 1658 1659 /* record the last minlen when FITRIM is called. */ 1660 unsigned long s_last_trim_minblks; 1661 1662 /* Reference to checksum algorithm driver via cryptoapi */ 1663 struct crypto_shash *s_chksum_driver; 1664 1665 /* Precomputed FS UUID checksum for seeding other checksums */ 1666 __u32 s_csum_seed; 1667 1668 /* Reclaim extents from extent status tree */ 1669 struct shrinker *s_es_shrinker; 1670 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1671 long s_es_nr_inode; 1672 struct ext4_es_stats s_es_stats; 1673 struct mb_cache *s_ea_block_cache; 1674 struct mb_cache *s_ea_inode_cache; 1675 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1676 1677 /* Journal triggers for checksum computation */ 1678 struct ext4_journal_trigger s_journal_triggers[EXT4_JOURNAL_TRIGGER_COUNT]; 1679 1680 /* Ratelimit ext4 messages. */ 1681 struct ratelimit_state s_err_ratelimit_state; 1682 struct ratelimit_state s_warning_ratelimit_state; 1683 struct ratelimit_state s_msg_ratelimit_state; 1684 atomic_t s_warning_count; 1685 atomic_t s_msg_count; 1686 1687 /* Encryption policy for '-o test_dummy_encryption' */ 1688 struct fscrypt_dummy_policy s_dummy_enc_policy; 1689 1690 /* 1691 * Barrier between writepages ops and changing any inode's JOURNAL_DATA 1692 * or EXTENTS flag or between writepages ops and changing DELALLOC or 1693 * DIOREAD_NOLOCK mount options on remount. 1694 */ 1695 struct percpu_rw_semaphore s_writepages_rwsem; 1696 struct dax_device *s_daxdev; 1697 u64 s_dax_part_off; 1698 #ifdef CONFIG_EXT4_DEBUG 1699 unsigned long s_simulate_fail; 1700 #endif 1701 /* Record the errseq of the backing block device */ 1702 errseq_t s_bdev_wb_err; 1703 spinlock_t s_bdev_wb_lock; 1704 1705 /* Information about errors that happened during this mount */ 1706 spinlock_t s_error_lock; 1707 int s_add_error_count; 1708 int s_first_error_code; 1709 __u32 s_first_error_line; 1710 __u32 s_first_error_ino; 1711 __u64 s_first_error_block; 1712 const char *s_first_error_func; 1713 time64_t s_first_error_time; 1714 int s_last_error_code; 1715 __u32 s_last_error_line; 1716 __u32 s_last_error_ino; 1717 __u64 s_last_error_block; 1718 const char *s_last_error_func; 1719 time64_t s_last_error_time; 1720 /* 1721 * If we are in a context where we cannot update the on-disk 1722 * superblock, we queue the work here. This is used to update 1723 * the error information in the superblock, and for periodic 1724 * updates of the superblock called from the commit callback 1725 * function. 1726 */ 1727 struct work_struct s_sb_upd_work; 1728 1729 /* Ext4 fast commit sub transaction ID */ 1730 atomic_t s_fc_subtid; 1731 1732 /* 1733 * After commit starts, the main queue gets locked, and the further 1734 * updates get added in the staging queue. 1735 */ 1736 #define FC_Q_MAIN 0 1737 #define FC_Q_STAGING 1 1738 struct list_head s_fc_q[2]; /* Inodes staged for fast commit 1739 * that have data changes in them. 1740 */ 1741 struct list_head s_fc_dentry_q[2]; /* directory entry updates */ 1742 unsigned int s_fc_bytes; 1743 /* 1744 * Main fast commit lock. This lock protects accesses to the 1745 * following fields: 1746 * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh. 1747 */ 1748 spinlock_t s_fc_lock; 1749 struct buffer_head *s_fc_bh; 1750 struct ext4_fc_stats s_fc_stats; 1751 tid_t s_fc_ineligible_tid; 1752 #ifdef CONFIG_EXT4_DEBUG 1753 int s_fc_debug_max_replay; 1754 #endif 1755 struct ext4_fc_replay_state s_fc_replay_state; 1756 }; 1757 1758 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1759 { 1760 return sb->s_fs_info; 1761 } 1762 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1763 { 1764 return container_of(inode, struct ext4_inode_info, vfs_inode); 1765 } 1766 1767 static inline int ext4_writepages_down_read(struct super_block *sb) 1768 { 1769 percpu_down_read(&EXT4_SB(sb)->s_writepages_rwsem); 1770 return memalloc_nofs_save(); 1771 } 1772 1773 static inline void ext4_writepages_up_read(struct super_block *sb, int ctx) 1774 { 1775 memalloc_nofs_restore(ctx); 1776 percpu_up_read(&EXT4_SB(sb)->s_writepages_rwsem); 1777 } 1778 1779 static inline int ext4_writepages_down_write(struct super_block *sb) 1780 { 1781 percpu_down_write(&EXT4_SB(sb)->s_writepages_rwsem); 1782 return memalloc_nofs_save(); 1783 } 1784 1785 static inline void ext4_writepages_up_write(struct super_block *sb, int ctx) 1786 { 1787 memalloc_nofs_restore(ctx); 1788 percpu_up_write(&EXT4_SB(sb)->s_writepages_rwsem); 1789 } 1790 1791 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1792 { 1793 return ino == EXT4_ROOT_INO || 1794 (ino >= EXT4_FIRST_INO(sb) && 1795 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1796 } 1797 1798 /* 1799 * Returns: sbi->field[index] 1800 * Used to access an array element from the following sbi fields which require 1801 * rcu protection to avoid dereferencing an invalid pointer due to reassignment 1802 * - s_group_desc 1803 * - s_group_info 1804 * - s_flex_group 1805 */ 1806 #define sbi_array_rcu_deref(sbi, field, index) \ 1807 ({ \ 1808 typeof(*((sbi)->field)) _v; \ 1809 rcu_read_lock(); \ 1810 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \ 1811 rcu_read_unlock(); \ 1812 _v; \ 1813 }) 1814 1815 /* 1816 * run-time mount flags 1817 */ 1818 enum { 1819 EXT4_MF_MNTDIR_SAMPLED, 1820 EXT4_MF_FC_INELIGIBLE /* Fast commit ineligible */ 1821 }; 1822 1823 static inline void ext4_set_mount_flag(struct super_block *sb, int bit) 1824 { 1825 set_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1826 } 1827 1828 static inline void ext4_clear_mount_flag(struct super_block *sb, int bit) 1829 { 1830 clear_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1831 } 1832 1833 static inline int ext4_test_mount_flag(struct super_block *sb, int bit) 1834 { 1835 return test_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1836 } 1837 1838 1839 /* 1840 * Simulate_fail codes 1841 */ 1842 #define EXT4_SIM_BBITMAP_EIO 1 1843 #define EXT4_SIM_BBITMAP_CRC 2 1844 #define EXT4_SIM_IBITMAP_EIO 3 1845 #define EXT4_SIM_IBITMAP_CRC 4 1846 #define EXT4_SIM_INODE_EIO 5 1847 #define EXT4_SIM_INODE_CRC 6 1848 #define EXT4_SIM_DIRBLOCK_EIO 7 1849 #define EXT4_SIM_DIRBLOCK_CRC 8 1850 1851 static inline bool ext4_simulate_fail(struct super_block *sb, 1852 unsigned long code) 1853 { 1854 #ifdef CONFIG_EXT4_DEBUG 1855 struct ext4_sb_info *sbi = EXT4_SB(sb); 1856 1857 if (unlikely(sbi->s_simulate_fail == code)) { 1858 sbi->s_simulate_fail = 0; 1859 return true; 1860 } 1861 #endif 1862 return false; 1863 } 1864 1865 static inline void ext4_simulate_fail_bh(struct super_block *sb, 1866 struct buffer_head *bh, 1867 unsigned long code) 1868 { 1869 if (!IS_ERR(bh) && ext4_simulate_fail(sb, code)) 1870 clear_buffer_uptodate(bh); 1871 } 1872 1873 /* 1874 * Error number codes for s_{first,last}_error_errno 1875 * 1876 * Linux errno numbers are architecture specific, so we need to translate 1877 * them into something which is architecture independent. We don't define 1878 * codes for all errno's; just the ones which are most likely to be the cause 1879 * of an ext4_error() call. 1880 */ 1881 #define EXT4_ERR_UNKNOWN 1 1882 #define EXT4_ERR_EIO 2 1883 #define EXT4_ERR_ENOMEM 3 1884 #define EXT4_ERR_EFSBADCRC 4 1885 #define EXT4_ERR_EFSCORRUPTED 5 1886 #define EXT4_ERR_ENOSPC 6 1887 #define EXT4_ERR_ENOKEY 7 1888 #define EXT4_ERR_EROFS 8 1889 #define EXT4_ERR_EFBIG 9 1890 #define EXT4_ERR_EEXIST 10 1891 #define EXT4_ERR_ERANGE 11 1892 #define EXT4_ERR_EOVERFLOW 12 1893 #define EXT4_ERR_EBUSY 13 1894 #define EXT4_ERR_ENOTDIR 14 1895 #define EXT4_ERR_ENOTEMPTY 15 1896 #define EXT4_ERR_ESHUTDOWN 16 1897 #define EXT4_ERR_EFAULT 17 1898 1899 /* 1900 * Inode dynamic state flags 1901 */ 1902 enum { 1903 EXT4_STATE_NEW, /* inode is newly created */ 1904 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1905 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1906 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1907 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1908 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1909 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1910 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1911 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */ 1912 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */ 1913 EXT4_STATE_FC_COMMITTING, /* Fast commit ongoing */ 1914 EXT4_STATE_ORPHAN_FILE, /* Inode orphaned in orphan file */ 1915 }; 1916 1917 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1918 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1919 { \ 1920 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1921 } \ 1922 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1923 { \ 1924 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1925 } \ 1926 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1927 { \ 1928 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1929 } 1930 1931 /* Add these declarations here only so that these functions can be 1932 * found by name. Otherwise, they are very hard to locate. */ 1933 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1934 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1935 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1936 EXT4_INODE_BIT_FNS(flag, flags, 0) 1937 1938 /* Add these declarations here only so that these functions can be 1939 * found by name. Otherwise, they are very hard to locate. */ 1940 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1941 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1942 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1943 #if (BITS_PER_LONG < 64) 1944 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1945 1946 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1947 { 1948 (ei)->i_state_flags = 0; 1949 } 1950 #else 1951 EXT4_INODE_BIT_FNS(state, flags, 32) 1952 1953 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1954 { 1955 /* We depend on the fact that callers will set i_flags */ 1956 } 1957 #endif 1958 #else 1959 /* Assume that user mode programs are passing in an ext4fs superblock, not 1960 * a kernel struct super_block. This will allow us to call the feature-test 1961 * macros from user land. */ 1962 #define EXT4_SB(sb) (sb) 1963 #endif 1964 1965 static inline bool ext4_verity_in_progress(struct inode *inode) 1966 { 1967 return IS_ENABLED(CONFIG_FS_VERITY) && 1968 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS); 1969 } 1970 1971 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1972 1973 /* 1974 * Codes for operating systems 1975 */ 1976 #define EXT4_OS_LINUX 0 1977 #define EXT4_OS_HURD 1 1978 #define EXT4_OS_MASIX 2 1979 #define EXT4_OS_FREEBSD 3 1980 #define EXT4_OS_LITES 4 1981 1982 /* 1983 * Revision levels 1984 */ 1985 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1986 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1987 1988 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1989 1990 #define EXT4_GOOD_OLD_INODE_SIZE 128 1991 1992 #define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN) 1993 #define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX 1994 #define EXT4_TIMESTAMP_MIN S32_MIN 1995 1996 /* 1997 * Feature set definitions 1998 */ 1999 2000 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 2001 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 2002 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 2003 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 2004 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 2005 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 2006 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 2007 /* 2008 * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes 2009 * incompatible only if fast commit blocks are present in the FS. Since we 2010 * clear the journal (and thus the fast commit blocks), we don't mark FS as 2011 * incompatible. We also have a JBD2 incompat feature, which gets set when 2012 * there are fast commit blocks present in the journal. 2013 */ 2014 #define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400 2015 #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800 2016 #define EXT4_FEATURE_COMPAT_ORPHAN_FILE 0x1000 /* Orphan file exists */ 2017 2018 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 2019 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 2020 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 2021 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 2022 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 2023 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 2024 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 2025 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 2026 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 2027 /* 2028 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 2029 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 2030 * all other data structures' checksums. However, the METADATA_CSUM and 2031 * GDT_CSUM bits are mutually exclusive. 2032 */ 2033 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 2034 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 2035 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 2036 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000 2037 #define EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT 0x10000 /* Orphan file may be 2038 non-empty */ 2039 2040 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 2041 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 2042 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 2043 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 2044 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 2045 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 2046 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 2047 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 2048 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 2049 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 2050 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 2051 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 2052 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 2053 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 2054 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 2055 #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000 2056 2057 extern void ext4_update_dynamic_rev(struct super_block *sb); 2058 2059 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 2060 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 2061 { \ 2062 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 2063 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 2064 } \ 2065 static inline void ext4_set_feature_##name(struct super_block *sb) \ 2066 { \ 2067 ext4_update_dynamic_rev(sb); \ 2068 EXT4_SB(sb)->s_es->s_feature_compat |= \ 2069 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 2070 } \ 2071 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 2072 { \ 2073 EXT4_SB(sb)->s_es->s_feature_compat &= \ 2074 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 2075 } 2076 2077 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 2078 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 2079 { \ 2080 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 2081 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 2082 } \ 2083 static inline void ext4_set_feature_##name(struct super_block *sb) \ 2084 { \ 2085 ext4_update_dynamic_rev(sb); \ 2086 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 2087 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 2088 } \ 2089 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 2090 { \ 2091 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 2092 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 2093 } 2094 2095 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 2096 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 2097 { \ 2098 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 2099 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 2100 } \ 2101 static inline void ext4_set_feature_##name(struct super_block *sb) \ 2102 { \ 2103 ext4_update_dynamic_rev(sb); \ 2104 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 2105 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 2106 } \ 2107 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 2108 { \ 2109 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 2110 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 2111 } 2112 2113 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 2114 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 2115 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 2116 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 2117 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 2118 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 2119 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 2120 EXT4_FEATURE_COMPAT_FUNCS(fast_commit, FAST_COMMIT) 2121 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES) 2122 EXT4_FEATURE_COMPAT_FUNCS(orphan_file, ORPHAN_FILE) 2123 2124 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 2125 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 2126 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 2127 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 2128 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 2129 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 2130 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 2131 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 2132 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 2133 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 2134 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 2135 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 2136 EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY) 2137 EXT4_FEATURE_RO_COMPAT_FUNCS(orphan_present, ORPHAN_PRESENT) 2138 2139 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 2140 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 2141 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 2142 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 2143 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 2144 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 2145 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 2146 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 2147 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 2148 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 2149 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 2150 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 2151 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 2152 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 2153 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 2154 EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD) 2155 2156 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2157 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2158 EXT4_FEATURE_INCOMPAT_META_BG) 2159 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2160 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2161 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 2162 2163 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2164 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2165 EXT4_FEATURE_INCOMPAT_RECOVER| \ 2166 EXT4_FEATURE_INCOMPAT_META_BG) 2167 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2168 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2169 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 2170 2171 #define EXT4_FEATURE_COMPAT_SUPP (EXT4_FEATURE_COMPAT_EXT_ATTR| \ 2172 EXT4_FEATURE_COMPAT_ORPHAN_FILE) 2173 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2174 EXT4_FEATURE_INCOMPAT_RECOVER| \ 2175 EXT4_FEATURE_INCOMPAT_META_BG| \ 2176 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 2177 EXT4_FEATURE_INCOMPAT_64BIT| \ 2178 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 2179 EXT4_FEATURE_INCOMPAT_EA_INODE| \ 2180 EXT4_FEATURE_INCOMPAT_MMP | \ 2181 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 2182 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 2183 EXT4_FEATURE_INCOMPAT_CASEFOLD | \ 2184 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \ 2185 EXT4_FEATURE_INCOMPAT_LARGEDIR) 2186 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2187 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2188 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 2189 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 2190 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 2191 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 2192 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 2193 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 2194 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 2195 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 2196 EXT4_FEATURE_RO_COMPAT_PROJECT |\ 2197 EXT4_FEATURE_RO_COMPAT_VERITY |\ 2198 EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT) 2199 2200 #define EXTN_FEATURE_FUNCS(ver) \ 2201 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 2202 { \ 2203 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 2204 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 2205 } \ 2206 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 2207 { \ 2208 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 2209 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 2210 } \ 2211 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 2212 { \ 2213 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 2214 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 2215 } 2216 2217 EXTN_FEATURE_FUNCS(2) 2218 EXTN_FEATURE_FUNCS(3) 2219 EXTN_FEATURE_FUNCS(4) 2220 2221 static inline bool ext4_has_compat_features(struct super_block *sb) 2222 { 2223 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 2224 } 2225 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 2226 { 2227 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 2228 } 2229 static inline bool ext4_has_incompat_features(struct super_block *sb) 2230 { 2231 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 2232 } 2233 2234 extern int ext4_feature_set_ok(struct super_block *sb, int readonly); 2235 2236 /* 2237 * Superblock flags 2238 */ 2239 #define EXT4_FLAGS_RESIZING 0 2240 #define EXT4_FLAGS_SHUTDOWN 1 2241 #define EXT4_FLAGS_BDEV_IS_DAX 2 2242 2243 static inline int ext4_forced_shutdown(struct super_block *sb) 2244 { 2245 return test_bit(EXT4_FLAGS_SHUTDOWN, &EXT4_SB(sb)->s_ext4_flags); 2246 } 2247 2248 /* 2249 * Default values for user and/or group using reserved blocks 2250 */ 2251 #define EXT4_DEF_RESUID 0 2252 #define EXT4_DEF_RESGID 0 2253 2254 /* 2255 * Default project ID 2256 */ 2257 #define EXT4_DEF_PROJID 0 2258 2259 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 2260 2261 /* 2262 * Default mount options 2263 */ 2264 #define EXT4_DEFM_DEBUG 0x0001 2265 #define EXT4_DEFM_BSDGROUPS 0x0002 2266 #define EXT4_DEFM_XATTR_USER 0x0004 2267 #define EXT4_DEFM_ACL 0x0008 2268 #define EXT4_DEFM_UID16 0x0010 2269 #define EXT4_DEFM_JMODE 0x0060 2270 #define EXT4_DEFM_JMODE_DATA 0x0020 2271 #define EXT4_DEFM_JMODE_ORDERED 0x0040 2272 #define EXT4_DEFM_JMODE_WBACK 0x0060 2273 #define EXT4_DEFM_NOBARRIER 0x0100 2274 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 2275 #define EXT4_DEFM_DISCARD 0x0400 2276 #define EXT4_DEFM_NODELALLOC 0x0800 2277 2278 /* 2279 * Default journal batch times 2280 */ 2281 #define EXT4_DEF_MIN_BATCH_TIME 0 2282 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 2283 2284 /* 2285 * Minimum number of groups in a flexgroup before we separate out 2286 * directories into the first block group of a flexgroup 2287 */ 2288 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 2289 2290 /* 2291 * Structure of a directory entry 2292 */ 2293 #define EXT4_NAME_LEN 255 2294 /* 2295 * Base length of the ext4 directory entry excluding the name length 2296 */ 2297 #define EXT4_BASE_DIR_LEN (sizeof(struct ext4_dir_entry_2) - EXT4_NAME_LEN) 2298 2299 struct ext4_dir_entry { 2300 __le32 inode; /* Inode number */ 2301 __le16 rec_len; /* Directory entry length */ 2302 __le16 name_len; /* Name length */ 2303 char name[EXT4_NAME_LEN]; /* File name */ 2304 }; 2305 2306 2307 /* 2308 * Encrypted Casefolded entries require saving the hash on disk. This structure 2309 * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned 2310 * boundary. 2311 */ 2312 struct ext4_dir_entry_hash { 2313 __le32 hash; 2314 __le32 minor_hash; 2315 }; 2316 2317 /* 2318 * The new version of the directory entry. Since EXT4 structures are 2319 * stored in intel byte order, and the name_len field could never be 2320 * bigger than 255 chars, it's safe to reclaim the extra byte for the 2321 * file_type field. 2322 */ 2323 struct ext4_dir_entry_2 { 2324 __le32 inode; /* Inode number */ 2325 __le16 rec_len; /* Directory entry length */ 2326 __u8 name_len; /* Name length */ 2327 __u8 file_type; /* See file type macros EXT4_FT_* below */ 2328 char name[EXT4_NAME_LEN]; /* File name */ 2329 }; 2330 2331 /* 2332 * Access the hashes at the end of ext4_dir_entry_2 2333 */ 2334 #define EXT4_DIRENT_HASHES(entry) \ 2335 ((struct ext4_dir_entry_hash *) \ 2336 (((void *)(entry)) + \ 2337 ((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND))) 2338 #define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(de)->hash) 2339 #define EXT4_DIRENT_MINOR_HASH(entry) \ 2340 le32_to_cpu(EXT4_DIRENT_HASHES(de)->minor_hash) 2341 2342 static inline bool ext4_hash_in_dirent(const struct inode *inode) 2343 { 2344 return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode); 2345 } 2346 2347 /* 2348 * This is a bogus directory entry at the end of each leaf block that 2349 * records checksums. 2350 */ 2351 struct ext4_dir_entry_tail { 2352 __le32 det_reserved_zero1; /* Pretend to be unused */ 2353 __le16 det_rec_len; /* 12 */ 2354 __u8 det_reserved_zero2; /* Zero name length */ 2355 __u8 det_reserved_ft; /* 0xDE, fake file type */ 2356 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 2357 }; 2358 2359 #define EXT4_DIRENT_TAIL(block, blocksize) \ 2360 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 2361 ((blocksize) - \ 2362 sizeof(struct ext4_dir_entry_tail)))) 2363 2364 /* 2365 * Ext4 directory file types. Only the low 3 bits are used. The 2366 * other bits are reserved for now. 2367 */ 2368 #define EXT4_FT_UNKNOWN 0 2369 #define EXT4_FT_REG_FILE 1 2370 #define EXT4_FT_DIR 2 2371 #define EXT4_FT_CHRDEV 3 2372 #define EXT4_FT_BLKDEV 4 2373 #define EXT4_FT_FIFO 5 2374 #define EXT4_FT_SOCK 6 2375 #define EXT4_FT_SYMLINK 7 2376 2377 #define EXT4_FT_MAX 8 2378 2379 #define EXT4_FT_DIR_CSUM 0xDE 2380 2381 /* 2382 * EXT4_DIR_PAD defines the directory entries boundaries 2383 * 2384 * NOTE: It must be a multiple of 4 2385 */ 2386 #define EXT4_DIR_PAD 4 2387 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 2388 #define EXT4_MAX_REC_LEN ((1<<16)-1) 2389 2390 /* 2391 * The rec_len is dependent on the type of directory. Directories that are 2392 * casefolded and encrypted need to store the hash as well, so we add room for 2393 * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should 2394 * pass NULL for dir, as those entries do not use the extra fields. 2395 */ 2396 static inline unsigned int ext4_dir_rec_len(__u8 name_len, 2397 const struct inode *dir) 2398 { 2399 int rec_len = (name_len + 8 + EXT4_DIR_ROUND); 2400 2401 if (dir && ext4_hash_in_dirent(dir)) 2402 rec_len += sizeof(struct ext4_dir_entry_hash); 2403 return (rec_len & ~EXT4_DIR_ROUND); 2404 } 2405 2406 /* 2407 * If we ever get support for fs block sizes > page_size, we'll need 2408 * to remove the #if statements in the next two functions... 2409 */ 2410 static inline unsigned int 2411 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 2412 { 2413 unsigned len = le16_to_cpu(dlen); 2414 2415 #if (PAGE_SIZE >= 65536) 2416 if (len == EXT4_MAX_REC_LEN || len == 0) 2417 return blocksize; 2418 return (len & 65532) | ((len & 3) << 16); 2419 #else 2420 return len; 2421 #endif 2422 } 2423 2424 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 2425 { 2426 BUG_ON((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)); 2427 #if (PAGE_SIZE >= 65536) 2428 if (len < 65536) 2429 return cpu_to_le16(len); 2430 if (len == blocksize) { 2431 if (blocksize == 65536) 2432 return cpu_to_le16(EXT4_MAX_REC_LEN); 2433 else 2434 return cpu_to_le16(0); 2435 } 2436 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 2437 #else 2438 return cpu_to_le16(len); 2439 #endif 2440 } 2441 2442 /* 2443 * Hash Tree Directory indexing 2444 * (c) Daniel Phillips, 2001 2445 */ 2446 2447 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2448 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2449 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \ 2450 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir))) 2451 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2452 2453 /* Legal values for the dx_root hash_version field: */ 2454 2455 #define DX_HASH_LEGACY 0 2456 #define DX_HASH_HALF_MD4 1 2457 #define DX_HASH_TEA 2 2458 #define DX_HASH_LEGACY_UNSIGNED 3 2459 #define DX_HASH_HALF_MD4_UNSIGNED 4 2460 #define DX_HASH_TEA_UNSIGNED 5 2461 #define DX_HASH_SIPHASH 6 2462 2463 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 2464 const void *address, unsigned int length) 2465 { 2466 struct { 2467 struct shash_desc shash; 2468 char ctx[4]; 2469 } desc; 2470 2471 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2472 2473 desc.shash.tfm = sbi->s_chksum_driver; 2474 *(u32 *)desc.ctx = crc; 2475 2476 BUG_ON(crypto_shash_update(&desc.shash, address, length)); 2477 2478 return *(u32 *)desc.ctx; 2479 } 2480 2481 #ifdef __KERNEL__ 2482 2483 /* hash info structure used by the directory hash */ 2484 struct dx_hash_info 2485 { 2486 u32 hash; 2487 u32 minor_hash; 2488 int hash_version; 2489 u32 *seed; 2490 }; 2491 2492 2493 /* 32 and 64 bit signed EOF for dx directories */ 2494 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2495 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2496 2497 2498 /* 2499 * Control parameters used by ext4_htree_next_block 2500 */ 2501 #define HASH_NB_ALWAYS 1 2502 2503 struct ext4_filename { 2504 const struct qstr *usr_fname; 2505 struct fscrypt_str disk_name; 2506 struct dx_hash_info hinfo; 2507 #ifdef CONFIG_FS_ENCRYPTION 2508 struct fscrypt_str crypto_buf; 2509 #endif 2510 #if IS_ENABLED(CONFIG_UNICODE) 2511 struct fscrypt_str cf_name; 2512 #endif 2513 }; 2514 2515 #define fname_name(p) ((p)->disk_name.name) 2516 #define fname_usr_name(p) ((p)->usr_fname->name) 2517 #define fname_len(p) ((p)->disk_name.len) 2518 2519 /* 2520 * Describe an inode's exact location on disk and in memory 2521 */ 2522 struct ext4_iloc 2523 { 2524 struct buffer_head *bh; 2525 unsigned long offset; 2526 ext4_group_t block_group; 2527 }; 2528 2529 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2530 { 2531 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2532 } 2533 2534 static inline bool ext4_is_quota_file(struct inode *inode) 2535 { 2536 return IS_NOQUOTA(inode) && 2537 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL); 2538 } 2539 2540 /* 2541 * This structure is stuffed into the struct file's private_data field 2542 * for directories. It is where we put information so that we can do 2543 * readdir operations in hash tree order. 2544 */ 2545 struct dir_private_info { 2546 struct rb_root root; 2547 struct rb_node *curr_node; 2548 struct fname *extra_fname; 2549 loff_t last_pos; 2550 __u32 curr_hash; 2551 __u32 curr_minor_hash; 2552 __u32 next_hash; 2553 }; 2554 2555 /* calculate the first block number of the group */ 2556 static inline ext4_fsblk_t 2557 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2558 { 2559 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2560 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2561 } 2562 2563 /* 2564 * Special error return code only used by dx_probe() and its callers. 2565 */ 2566 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2567 2568 /* htree levels for ext4 */ 2569 #define EXT4_HTREE_LEVEL_COMPAT 2 2570 #define EXT4_HTREE_LEVEL 3 2571 2572 static inline int ext4_dir_htree_level(struct super_block *sb) 2573 { 2574 return ext4_has_feature_largedir(sb) ? 2575 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT; 2576 } 2577 2578 /* 2579 * Timeout and state flag for lazy initialization inode thread. 2580 */ 2581 #define EXT4_DEF_LI_WAIT_MULT 10 2582 #define EXT4_DEF_LI_MAX_START_DELAY 5 2583 #define EXT4_LAZYINIT_QUIT 0x0001 2584 #define EXT4_LAZYINIT_RUNNING 0x0002 2585 2586 /* 2587 * Lazy inode table initialization info 2588 */ 2589 struct ext4_lazy_init { 2590 unsigned long li_state; 2591 struct list_head li_request_list; 2592 struct mutex li_list_mtx; 2593 }; 2594 2595 enum ext4_li_mode { 2596 EXT4_LI_MODE_PREFETCH_BBITMAP, 2597 EXT4_LI_MODE_ITABLE, 2598 }; 2599 2600 struct ext4_li_request { 2601 struct super_block *lr_super; 2602 enum ext4_li_mode lr_mode; 2603 ext4_group_t lr_first_not_zeroed; 2604 ext4_group_t lr_next_group; 2605 struct list_head lr_request; 2606 unsigned long lr_next_sched; 2607 unsigned long lr_timeout; 2608 }; 2609 2610 struct ext4_features { 2611 struct kobject f_kobj; 2612 struct completion f_kobj_unregister; 2613 }; 2614 2615 /* 2616 * This structure will be used for multiple mount protection. It will be 2617 * written into the block number saved in the s_mmp_block field in the 2618 * superblock. Programs that check MMP should assume that if 2619 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2620 * to use the filesystem, regardless of how old the timestamp is. 2621 */ 2622 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2623 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2624 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2625 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2626 2627 struct mmp_struct { 2628 __le32 mmp_magic; /* Magic number for MMP */ 2629 __le32 mmp_seq; /* Sequence no. updated periodically */ 2630 2631 /* 2632 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2633 * purposes and do not affect the correctness of the algorithm 2634 */ 2635 __le64 mmp_time; /* Time last updated */ 2636 char mmp_nodename[64]; /* Node which last updated MMP block */ 2637 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2638 2639 /* 2640 * mmp_check_interval is used to verify if the MMP block has been 2641 * updated on the block device. The value is updated based on the 2642 * maximum time to write the MMP block during an update cycle. 2643 */ 2644 __le16 mmp_check_interval; 2645 2646 __le16 mmp_pad1; 2647 __le32 mmp_pad2[226]; 2648 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2649 }; 2650 2651 /* arguments passed to the mmp thread */ 2652 struct mmpd_data { 2653 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2654 struct super_block *sb; /* super block of the fs */ 2655 }; 2656 2657 /* 2658 * Check interval multiplier 2659 * The MMP block is written every update interval and initially checked every 2660 * update interval x the multiplier (the value is then adapted based on the 2661 * write latency). The reason is that writes can be delayed under load and we 2662 * don't want readers to incorrectly assume that the filesystem is no longer 2663 * in use. 2664 */ 2665 #define EXT4_MMP_CHECK_MULT 2UL 2666 2667 /* 2668 * Minimum interval for MMP checking in seconds. 2669 */ 2670 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2671 2672 /* 2673 * Maximum interval for MMP checking in seconds. 2674 */ 2675 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2676 2677 /* 2678 * Function prototypes 2679 */ 2680 2681 /* 2682 * Ok, these declarations are also in <linux/kernel.h> but none of the 2683 * ext4 source programs needs to include it so they are duplicated here. 2684 */ 2685 # define NORET_TYPE /**/ 2686 # define ATTRIB_NORET __attribute__((noreturn)) 2687 # define NORET_AND noreturn, 2688 2689 /* bitmap.c */ 2690 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2691 void ext4_inode_bitmap_csum_set(struct super_block *sb, 2692 struct ext4_group_desc *gdp, 2693 struct buffer_head *bh, int sz); 2694 int ext4_inode_bitmap_csum_verify(struct super_block *sb, 2695 struct ext4_group_desc *gdp, 2696 struct buffer_head *bh, int sz); 2697 void ext4_block_bitmap_csum_set(struct super_block *sb, 2698 struct ext4_group_desc *gdp, 2699 struct buffer_head *bh); 2700 int ext4_block_bitmap_csum_verify(struct super_block *sb, 2701 struct ext4_group_desc *gdp, 2702 struct buffer_head *bh); 2703 2704 /* balloc.c */ 2705 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2706 ext4_fsblk_t blocknr, 2707 ext4_group_t *blockgrpp, 2708 ext4_grpblk_t *offsetp); 2709 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2710 ext4_fsblk_t block); 2711 2712 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2713 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2714 ext4_group_t group); 2715 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2716 ext4_fsblk_t goal, 2717 unsigned int flags, 2718 unsigned long *count, 2719 int *errp); 2720 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2721 s64 nclusters, unsigned int flags); 2722 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2723 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2724 ext4_group_t block_group, 2725 struct buffer_head ** bh); 2726 extern struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2727 ext4_group_t group); 2728 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2729 2730 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2731 ext4_group_t block_group, 2732 bool ignore_locked); 2733 extern int ext4_wait_block_bitmap(struct super_block *sb, 2734 ext4_group_t block_group, 2735 struct buffer_head *bh); 2736 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2737 ext4_group_t block_group); 2738 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2739 ext4_group_t block_group, 2740 struct ext4_group_desc *gdp); 2741 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2742 2743 #if IS_ENABLED(CONFIG_UNICODE) 2744 extern int ext4_fname_setup_ci_filename(struct inode *dir, 2745 const struct qstr *iname, 2746 struct ext4_filename *fname); 2747 #endif 2748 2749 /* ext4 encryption related stuff goes here crypto.c */ 2750 #ifdef CONFIG_FS_ENCRYPTION 2751 extern const struct fscrypt_operations ext4_cryptops; 2752 2753 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname, 2754 int lookup, struct ext4_filename *fname); 2755 2756 int ext4_fname_prepare_lookup(struct inode *dir, struct dentry *dentry, 2757 struct ext4_filename *fname); 2758 2759 void ext4_fname_free_filename(struct ext4_filename *fname); 2760 2761 int ext4_ioctl_get_encryption_pwsalt(struct file *filp, void __user *arg); 2762 2763 #else /* !CONFIG_FS_ENCRYPTION */ 2764 static inline int ext4_fname_setup_filename(struct inode *dir, 2765 const struct qstr *iname, 2766 int lookup, 2767 struct ext4_filename *fname) 2768 { 2769 int err = 0; 2770 fname->usr_fname = iname; 2771 fname->disk_name.name = (unsigned char *) iname->name; 2772 fname->disk_name.len = iname->len; 2773 2774 #if IS_ENABLED(CONFIG_UNICODE) 2775 err = ext4_fname_setup_ci_filename(dir, iname, fname); 2776 #endif 2777 2778 return err; 2779 } 2780 2781 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2782 struct dentry *dentry, 2783 struct ext4_filename *fname) 2784 { 2785 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname); 2786 } 2787 2788 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2789 { 2790 #if IS_ENABLED(CONFIG_UNICODE) 2791 kfree(fname->cf_name.name); 2792 fname->cf_name.name = NULL; 2793 #endif 2794 } 2795 2796 static inline int ext4_ioctl_get_encryption_pwsalt(struct file *filp, 2797 void __user *arg) 2798 { 2799 return -EOPNOTSUPP; 2800 } 2801 #endif /* !CONFIG_FS_ENCRYPTION */ 2802 2803 /* dir.c */ 2804 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2805 struct file *, 2806 struct ext4_dir_entry_2 *, 2807 struct buffer_head *, char *, int, 2808 unsigned int); 2809 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2810 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2811 (de), (bh), (buf), (size), (offset))) 2812 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2813 __u32 minor_hash, 2814 struct ext4_dir_entry_2 *dirent, 2815 struct fscrypt_str *ent_name); 2816 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2817 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2818 struct buffer_head *bh, 2819 void *buf, int buf_size, 2820 struct ext4_filename *fname, 2821 struct ext4_dir_entry_2 **dest_de); 2822 void ext4_insert_dentry(struct inode *dir, struct inode *inode, 2823 struct ext4_dir_entry_2 *de, 2824 int buf_size, 2825 struct ext4_filename *fname); 2826 static inline void ext4_update_dx_flag(struct inode *inode) 2827 { 2828 if (!ext4_has_feature_dir_index(inode->i_sb) && 2829 ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) { 2830 /* ext4_iget() should have caught this... */ 2831 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb)); 2832 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2833 } 2834 } 2835 static const unsigned char ext4_filetype_table[] = { 2836 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2837 }; 2838 2839 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2840 { 2841 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2842 return DT_UNKNOWN; 2843 2844 return ext4_filetype_table[filetype]; 2845 } 2846 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2847 void *buf, int buf_size); 2848 2849 /* fsync.c */ 2850 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2851 2852 /* hash.c */ 2853 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len, 2854 struct dx_hash_info *hinfo); 2855 2856 /* ialloc.c */ 2857 extern int ext4_mark_inode_used(struct super_block *sb, int ino); 2858 extern struct inode *__ext4_new_inode(struct mnt_idmap *, handle_t *, 2859 struct inode *, umode_t, 2860 const struct qstr *qstr, __u32 goal, 2861 uid_t *owner, __u32 i_flags, 2862 int handle_type, unsigned int line_no, 2863 int nblocks); 2864 2865 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \ 2866 __ext4_new_inode(&nop_mnt_idmap, (handle), (dir), (mode), (qstr), \ 2867 (goal), (owner), i_flags, 0, 0, 0) 2868 #define ext4_new_inode_start_handle(idmap, dir, mode, qstr, goal, owner, \ 2869 type, nblocks) \ 2870 __ext4_new_inode((idmap), NULL, (dir), (mode), (qstr), (goal), (owner), \ 2871 0, (type), __LINE__, (nblocks)) 2872 2873 2874 extern void ext4_free_inode(handle_t *, struct inode *); 2875 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2876 extern unsigned long ext4_count_free_inodes(struct super_block *); 2877 extern unsigned long ext4_count_dirs(struct super_block *); 2878 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2879 extern int ext4_init_inode_table(struct super_block *sb, 2880 ext4_group_t group, int barrier); 2881 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2882 2883 /* fast_commit.c */ 2884 int ext4_fc_info_show(struct seq_file *seq, void *v); 2885 void ext4_fc_init(struct super_block *sb, journal_t *journal); 2886 void ext4_fc_init_inode(struct inode *inode); 2887 void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start, 2888 ext4_lblk_t end); 2889 void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode, 2890 struct dentry *dentry); 2891 void __ext4_fc_track_link(handle_t *handle, struct inode *inode, 2892 struct dentry *dentry); 2893 void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry); 2894 void ext4_fc_track_link(handle_t *handle, struct dentry *dentry); 2895 void __ext4_fc_track_create(handle_t *handle, struct inode *inode, 2896 struct dentry *dentry); 2897 void ext4_fc_track_create(handle_t *handle, struct dentry *dentry); 2898 void ext4_fc_track_inode(handle_t *handle, struct inode *inode); 2899 void ext4_fc_mark_ineligible(struct super_block *sb, int reason, handle_t *handle); 2900 void ext4_fc_start_update(struct inode *inode); 2901 void ext4_fc_stop_update(struct inode *inode); 2902 void ext4_fc_del(struct inode *inode); 2903 bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block); 2904 void ext4_fc_replay_cleanup(struct super_block *sb); 2905 int ext4_fc_commit(journal_t *journal, tid_t commit_tid); 2906 int __init ext4_fc_init_dentry_cache(void); 2907 void ext4_fc_destroy_dentry_cache(void); 2908 int ext4_fc_record_regions(struct super_block *sb, int ino, 2909 ext4_lblk_t lblk, ext4_fsblk_t pblk, 2910 int len, int replay); 2911 2912 /* mballoc.c */ 2913 extern const struct seq_operations ext4_mb_seq_groups_ops; 2914 extern const struct seq_operations ext4_mb_seq_structs_summary_ops; 2915 extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset); 2916 extern int ext4_mb_init(struct super_block *); 2917 extern void ext4_mb_release(struct super_block *); 2918 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2919 struct ext4_allocation_request *, int *); 2920 extern void ext4_discard_preallocations(struct inode *); 2921 extern int __init ext4_init_mballoc(void); 2922 extern void ext4_exit_mballoc(void); 2923 extern ext4_group_t ext4_mb_prefetch(struct super_block *sb, 2924 ext4_group_t group, 2925 unsigned int nr, int *cnt); 2926 extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group, 2927 unsigned int nr); 2928 2929 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2930 struct buffer_head *bh, ext4_fsblk_t block, 2931 unsigned long count, int flags); 2932 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2933 ext4_group_t ngroups); 2934 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2935 ext4_group_t i, struct ext4_group_desc *desc); 2936 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2937 ext4_fsblk_t block, unsigned long count); 2938 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2939 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid); 2940 extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block, 2941 int len, bool state); 2942 static inline bool ext4_mb_cr_expensive(enum criteria cr) 2943 { 2944 return cr >= CR_GOAL_LEN_SLOW; 2945 } 2946 2947 /* inode.c */ 2948 void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw, 2949 struct ext4_inode_info *ei); 2950 int ext4_inode_is_fast_symlink(struct inode *inode); 2951 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2952 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2953 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count, 2954 bool wait, struct buffer_head **bhs); 2955 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2956 struct buffer_head *bh_result, int create); 2957 int ext4_get_block(struct inode *inode, sector_t iblock, 2958 struct buffer_head *bh_result, int create); 2959 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2960 struct buffer_head *bh, int create); 2961 int ext4_walk_page_buffers(handle_t *handle, 2962 struct inode *inode, 2963 struct buffer_head *head, 2964 unsigned from, 2965 unsigned to, 2966 int *partial, 2967 int (*fn)(handle_t *handle, struct inode *inode, 2968 struct buffer_head *bh)); 2969 int do_journal_get_write_access(handle_t *handle, struct inode *inode, 2970 struct buffer_head *bh); 2971 #define FALL_BACK_TO_NONDELALLOC 1 2972 #define CONVERT_INLINE_DATA 2 2973 2974 typedef enum { 2975 EXT4_IGET_NORMAL = 0, 2976 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */ 2977 EXT4_IGET_HANDLE = 0x0002, /* Inode # is from a handle */ 2978 EXT4_IGET_BAD = 0x0004, /* Allow to iget a bad inode */ 2979 EXT4_IGET_EA_INODE = 0x0008 /* Inode should contain an EA value */ 2980 } ext4_iget_flags; 2981 2982 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, 2983 ext4_iget_flags flags, const char *function, 2984 unsigned int line); 2985 2986 #define ext4_iget(sb, ino, flags) \ 2987 __ext4_iget((sb), (ino), (flags), __func__, __LINE__) 2988 2989 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2990 extern int ext4_setattr(struct mnt_idmap *, struct dentry *, 2991 struct iattr *); 2992 extern u32 ext4_dio_alignment(struct inode *inode); 2993 extern int ext4_getattr(struct mnt_idmap *, const struct path *, 2994 struct kstat *, u32, unsigned int); 2995 extern void ext4_evict_inode(struct inode *); 2996 extern void ext4_clear_inode(struct inode *); 2997 extern int ext4_file_getattr(struct mnt_idmap *, const struct path *, 2998 struct kstat *, u32, unsigned int); 2999 extern void ext4_dirty_inode(struct inode *, int); 3000 extern int ext4_change_inode_journal_flag(struct inode *, int); 3001 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 3002 extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino, 3003 struct ext4_iloc *iloc); 3004 extern int ext4_inode_attach_jinode(struct inode *inode); 3005 extern int ext4_can_truncate(struct inode *inode); 3006 extern int ext4_truncate(struct inode *); 3007 extern int ext4_break_layouts(struct inode *); 3008 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length); 3009 extern void ext4_set_inode_flags(struct inode *, bool init); 3010 extern int ext4_alloc_da_blocks(struct inode *inode); 3011 extern void ext4_set_aops(struct inode *inode); 3012 extern int ext4_writepage_trans_blocks(struct inode *); 3013 extern int ext4_normal_submit_inode_data_buffers(struct jbd2_inode *jinode); 3014 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 3015 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 3016 loff_t lstart, loff_t lend); 3017 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf); 3018 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 3019 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 3020 extern void ext4_da_release_space(struct inode *inode, int to_free); 3021 extern void ext4_da_update_reserve_space(struct inode *inode, 3022 int used, int quota_claim); 3023 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 3024 ext4_fsblk_t pblk, ext4_lblk_t len); 3025 3026 /* indirect.c */ 3027 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 3028 struct ext4_map_blocks *map, int flags); 3029 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 3030 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 3031 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 3032 ext4_lblk_t start, ext4_lblk_t end); 3033 3034 /* ioctl.c */ 3035 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 3036 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 3037 int ext4_fileattr_set(struct mnt_idmap *idmap, 3038 struct dentry *dentry, struct fileattr *fa); 3039 int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa); 3040 extern void ext4_reset_inode_seed(struct inode *inode); 3041 int ext4_update_overhead(struct super_block *sb, bool force); 3042 int ext4_force_shutdown(struct super_block *sb, u32 flags); 3043 3044 /* migrate.c */ 3045 extern int ext4_ext_migrate(struct inode *); 3046 extern int ext4_ind_migrate(struct inode *inode); 3047 3048 /* namei.c */ 3049 extern int ext4_init_new_dir(handle_t *handle, struct inode *dir, 3050 struct inode *inode); 3051 extern int ext4_dirblock_csum_verify(struct inode *inode, 3052 struct buffer_head *bh); 3053 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 3054 __u32 start_minor_hash, __u32 *next_hash); 3055 extern int ext4_search_dir(struct buffer_head *bh, 3056 char *search_buf, 3057 int buf_size, 3058 struct inode *dir, 3059 struct ext4_filename *fname, 3060 unsigned int offset, 3061 struct ext4_dir_entry_2 **res_dir); 3062 extern int ext4_generic_delete_entry(struct inode *dir, 3063 struct ext4_dir_entry_2 *de_del, 3064 struct buffer_head *bh, 3065 void *entry_buf, 3066 int buf_size, 3067 int csum_size); 3068 extern bool ext4_empty_dir(struct inode *inode); 3069 3070 /* resize.c */ 3071 extern void ext4_kvfree_array_rcu(void *to_free); 3072 extern int ext4_group_add(struct super_block *sb, 3073 struct ext4_new_group_data *input); 3074 extern int ext4_group_extend(struct super_block *sb, 3075 struct ext4_super_block *es, 3076 ext4_fsblk_t n_blocks_count); 3077 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 3078 extern unsigned int ext4_list_backups(struct super_block *sb, 3079 unsigned int *three, unsigned int *five, 3080 unsigned int *seven); 3081 3082 /* super.c */ 3083 extern struct buffer_head *ext4_sb_bread(struct super_block *sb, 3084 sector_t block, blk_opf_t op_flags); 3085 extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb, 3086 sector_t block); 3087 extern void ext4_read_bh_nowait(struct buffer_head *bh, blk_opf_t op_flags, 3088 bh_end_io_t *end_io); 3089 extern int ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags, 3090 bh_end_io_t *end_io); 3091 extern int ext4_read_bh_lock(struct buffer_head *bh, blk_opf_t op_flags, bool wait); 3092 extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block); 3093 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 3094 extern int ext4_calculate_overhead(struct super_block *sb); 3095 extern __le32 ext4_superblock_csum(struct super_block *sb, 3096 struct ext4_super_block *es); 3097 extern void ext4_superblock_csum_set(struct super_block *sb); 3098 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 3099 ext4_group_t ngroup); 3100 extern const char *ext4_decode_error(struct super_block *sb, int errno, 3101 char nbuf[16]); 3102 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb, 3103 ext4_group_t block_group, 3104 unsigned int flags); 3105 extern unsigned int ext4_num_base_meta_blocks(struct super_block *sb, 3106 ext4_group_t block_group); 3107 3108 extern __printf(7, 8) 3109 void __ext4_error(struct super_block *, const char *, unsigned int, bool, 3110 int, __u64, const char *, ...); 3111 extern __printf(6, 7) 3112 void __ext4_error_inode(struct inode *, const char *, unsigned int, 3113 ext4_fsblk_t, int, const char *, ...); 3114 extern __printf(5, 6) 3115 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 3116 const char *, ...); 3117 extern void __ext4_std_error(struct super_block *, const char *, 3118 unsigned int, int); 3119 extern __printf(4, 5) 3120 void __ext4_warning(struct super_block *, const char *, unsigned int, 3121 const char *, ...); 3122 extern __printf(4, 5) 3123 void __ext4_warning_inode(const struct inode *inode, const char *function, 3124 unsigned int line, const char *fmt, ...); 3125 extern __printf(3, 4) 3126 void __ext4_msg(struct super_block *, const char *, const char *, ...); 3127 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 3128 const char *, unsigned int, const char *); 3129 extern __printf(7, 8) 3130 void __ext4_grp_locked_error(const char *, unsigned int, 3131 struct super_block *, ext4_group_t, 3132 unsigned long, ext4_fsblk_t, 3133 const char *, ...); 3134 3135 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 3136 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 3137 3138 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \ 3139 __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a) 3140 3141 #define ext4_error_inode_block(inode, block, err, fmt, a...) \ 3142 __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \ 3143 (fmt), ## a) 3144 3145 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 3146 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 3147 3148 #define ext4_abort(sb, err, fmt, a...) \ 3149 __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a) 3150 3151 #ifdef CONFIG_PRINTK 3152 3153 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 3154 __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__) 3155 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 3156 __ext4_error_inode((inode), (func), (line), (block), \ 3157 (err), (fmt), ##__VA_ARGS__) 3158 #define ext4_error_file(file, func, line, block, fmt, ...) \ 3159 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 3160 #define ext4_error(sb, fmt, ...) \ 3161 __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt), \ 3162 ##__VA_ARGS__) 3163 #define ext4_error_err(sb, err, fmt, ...) \ 3164 __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt), \ 3165 ##__VA_ARGS__) 3166 #define ext4_warning(sb, fmt, ...) \ 3167 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 3168 #define ext4_warning_inode(inode, fmt, ...) \ 3169 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 3170 #define ext4_msg(sb, level, fmt, ...) \ 3171 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 3172 #define dump_mmp_msg(sb, mmp, msg) \ 3173 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 3174 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 3175 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 3176 fmt, ##__VA_ARGS__) 3177 3178 #else 3179 3180 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 3181 do { \ 3182 no_printk(fmt, ##__VA_ARGS__); \ 3183 __ext4_error_inode(inode, "", 0, block, 0, " "); \ 3184 } while (0) 3185 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 3186 do { \ 3187 no_printk(fmt, ##__VA_ARGS__); \ 3188 __ext4_error_inode(inode, "", 0, block, err, " "); \ 3189 } while (0) 3190 #define ext4_error_file(file, func, line, block, fmt, ...) \ 3191 do { \ 3192 no_printk(fmt, ##__VA_ARGS__); \ 3193 __ext4_error_file(file, "", 0, block, " "); \ 3194 } while (0) 3195 #define ext4_error(sb, fmt, ...) \ 3196 do { \ 3197 no_printk(fmt, ##__VA_ARGS__); \ 3198 __ext4_error(sb, "", 0, false, 0, 0, " "); \ 3199 } while (0) 3200 #define ext4_error_err(sb, err, fmt, ...) \ 3201 do { \ 3202 no_printk(fmt, ##__VA_ARGS__); \ 3203 __ext4_error(sb, "", 0, false, err, 0, " "); \ 3204 } while (0) 3205 #define ext4_warning(sb, fmt, ...) \ 3206 do { \ 3207 no_printk(fmt, ##__VA_ARGS__); \ 3208 __ext4_warning(sb, "", 0, " "); \ 3209 } while (0) 3210 #define ext4_warning_inode(inode, fmt, ...) \ 3211 do { \ 3212 no_printk(fmt, ##__VA_ARGS__); \ 3213 __ext4_warning_inode(inode, "", 0, " "); \ 3214 } while (0) 3215 #define ext4_msg(sb, level, fmt, ...) \ 3216 do { \ 3217 no_printk(fmt, ##__VA_ARGS__); \ 3218 __ext4_msg(sb, "", " "); \ 3219 } while (0) 3220 #define dump_mmp_msg(sb, mmp, msg) \ 3221 __dump_mmp_msg(sb, mmp, "", 0, "") 3222 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 3223 do { \ 3224 no_printk(fmt, ##__VA_ARGS__); \ 3225 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 3226 } while (0) 3227 3228 #endif 3229 3230 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 3231 struct ext4_group_desc *bg); 3232 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 3233 struct ext4_group_desc *bg); 3234 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 3235 struct ext4_group_desc *bg); 3236 extern __u32 ext4_free_group_clusters(struct super_block *sb, 3237 struct ext4_group_desc *bg); 3238 extern __u32 ext4_free_inodes_count(struct super_block *sb, 3239 struct ext4_group_desc *bg); 3240 extern __u32 ext4_used_dirs_count(struct super_block *sb, 3241 struct ext4_group_desc *bg); 3242 extern __u32 ext4_itable_unused_count(struct super_block *sb, 3243 struct ext4_group_desc *bg); 3244 extern void ext4_block_bitmap_set(struct super_block *sb, 3245 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3246 extern void ext4_inode_bitmap_set(struct super_block *sb, 3247 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3248 extern void ext4_inode_table_set(struct super_block *sb, 3249 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3250 extern void ext4_free_group_clusters_set(struct super_block *sb, 3251 struct ext4_group_desc *bg, 3252 __u32 count); 3253 extern void ext4_free_inodes_set(struct super_block *sb, 3254 struct ext4_group_desc *bg, __u32 count); 3255 extern void ext4_used_dirs_set(struct super_block *sb, 3256 struct ext4_group_desc *bg, __u32 count); 3257 extern void ext4_itable_unused_set(struct super_block *sb, 3258 struct ext4_group_desc *bg, __u32 count); 3259 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 3260 struct ext4_group_desc *gdp); 3261 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 3262 struct ext4_group_desc *gdp); 3263 extern int ext4_register_li_request(struct super_block *sb, 3264 ext4_group_t first_not_zeroed); 3265 3266 static inline int ext4_has_metadata_csum(struct super_block *sb) 3267 { 3268 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 3269 !EXT4_SB(sb)->s_chksum_driver); 3270 3271 return ext4_has_feature_metadata_csum(sb) && 3272 (EXT4_SB(sb)->s_chksum_driver != NULL); 3273 } 3274 3275 static inline int ext4_has_group_desc_csum(struct super_block *sb) 3276 { 3277 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb); 3278 } 3279 3280 #define ext4_read_incompat_64bit_val(es, name) \ 3281 (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \ 3282 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \ 3283 le32_to_cpu(es->name##_lo)) 3284 3285 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 3286 { 3287 return ext4_read_incompat_64bit_val(es, s_blocks_count); 3288 } 3289 3290 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 3291 { 3292 return ext4_read_incompat_64bit_val(es, s_r_blocks_count); 3293 } 3294 3295 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 3296 { 3297 return ext4_read_incompat_64bit_val(es, s_free_blocks_count); 3298 } 3299 3300 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 3301 ext4_fsblk_t blk) 3302 { 3303 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 3304 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 3305 } 3306 3307 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 3308 ext4_fsblk_t blk) 3309 { 3310 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 3311 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 3312 } 3313 3314 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 3315 ext4_fsblk_t blk) 3316 { 3317 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 3318 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 3319 } 3320 3321 static inline loff_t ext4_isize(struct super_block *sb, 3322 struct ext4_inode *raw_inode) 3323 { 3324 if (ext4_has_feature_largedir(sb) || 3325 S_ISREG(le16_to_cpu(raw_inode->i_mode))) 3326 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 3327 le32_to_cpu(raw_inode->i_size_lo); 3328 3329 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 3330 } 3331 3332 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 3333 { 3334 raw_inode->i_size_lo = cpu_to_le32(i_size); 3335 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 3336 } 3337 3338 /* 3339 * Reading s_groups_count requires using smp_rmb() afterwards. See 3340 * the locking protocol documented in the comments of ext4_group_add() 3341 * in resize.c 3342 */ 3343 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 3344 { 3345 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 3346 3347 smp_rmb(); 3348 return ngroups; 3349 } 3350 3351 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 3352 ext4_group_t block_group) 3353 { 3354 return block_group >> sbi->s_log_groups_per_flex; 3355 } 3356 3357 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 3358 { 3359 return 1 << sbi->s_log_groups_per_flex; 3360 } 3361 3362 #define ext4_std_error(sb, errno) \ 3363 do { \ 3364 if ((errno)) \ 3365 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 3366 } while (0) 3367 3368 #ifdef CONFIG_SMP 3369 /* Each CPU can accumulate percpu_counter_batch clusters in their local 3370 * counters. So we need to make sure we have free clusters more 3371 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 3372 */ 3373 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 3374 #else 3375 #define EXT4_FREECLUSTERS_WATERMARK 0 3376 #endif 3377 3378 /* Update i_disksize. Requires i_rwsem to avoid races with truncate */ 3379 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 3380 { 3381 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 3382 !inode_is_locked(inode)); 3383 down_write(&EXT4_I(inode)->i_data_sem); 3384 if (newsize > EXT4_I(inode)->i_disksize) 3385 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize); 3386 up_write(&EXT4_I(inode)->i_data_sem); 3387 } 3388 3389 /* Update i_size, i_disksize. Requires i_rwsem to avoid races with truncate */ 3390 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 3391 { 3392 int changed = 0; 3393 3394 if (newsize > inode->i_size) { 3395 i_size_write(inode, newsize); 3396 changed = 1; 3397 } 3398 if (newsize > EXT4_I(inode)->i_disksize) { 3399 ext4_update_i_disksize(inode, newsize); 3400 changed |= 2; 3401 } 3402 return changed; 3403 } 3404 3405 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 3406 loff_t len); 3407 3408 struct ext4_group_info { 3409 unsigned long bb_state; 3410 #ifdef AGGRESSIVE_CHECK 3411 unsigned long bb_check_counter; 3412 #endif 3413 struct rb_root bb_free_root; 3414 ext4_grpblk_t bb_first_free; /* first free block */ 3415 ext4_grpblk_t bb_free; /* total free blocks */ 3416 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 3417 int bb_avg_fragment_size_order; /* order of average 3418 fragment in BG */ 3419 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 3420 ext4_group_t bb_group; /* Group number */ 3421 struct list_head bb_prealloc_list; 3422 #ifdef DOUBLE_CHECK 3423 void *bb_bitmap; 3424 #endif 3425 struct rw_semaphore alloc_sem; 3426 struct list_head bb_avg_fragment_size_node; 3427 struct list_head bb_largest_free_order_node; 3428 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 3429 * regions, index is order. 3430 * bb_counters[3] = 5 means 3431 * 5 free 8-block regions. */ 3432 }; 3433 3434 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 3435 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 3436 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 3437 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 3438 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \ 3439 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT) 3440 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \ 3441 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT) 3442 #define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4 3443 3444 #define EXT4_MB_GRP_NEED_INIT(grp) \ 3445 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 3446 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 3447 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3448 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 3449 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3450 3451 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 3452 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3453 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 3454 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3455 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 3456 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3457 #define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \ 3458 (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state))) 3459 3460 #define EXT4_MAX_CONTENTION 8 3461 #define EXT4_CONTENTION_THRESHOLD 2 3462 3463 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 3464 ext4_group_t group) 3465 { 3466 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 3467 } 3468 3469 /* 3470 * Returns true if the filesystem is busy enough that attempts to 3471 * access the block group locks has run into contention. 3472 */ 3473 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 3474 { 3475 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 3476 } 3477 3478 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 3479 { 3480 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 3481 if (spin_trylock(lock)) 3482 /* 3483 * We're able to grab the lock right away, so drop the 3484 * lock contention counter. 3485 */ 3486 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 3487 else { 3488 /* 3489 * The lock is busy, so bump the contention counter, 3490 * and then wait on the spin lock. 3491 */ 3492 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 3493 EXT4_MAX_CONTENTION); 3494 spin_lock(lock); 3495 } 3496 } 3497 3498 static inline void ext4_unlock_group(struct super_block *sb, 3499 ext4_group_t group) 3500 { 3501 spin_unlock(ext4_group_lock_ptr(sb, group)); 3502 } 3503 3504 #ifdef CONFIG_QUOTA 3505 static inline bool ext4_quota_capable(struct super_block *sb) 3506 { 3507 return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb)); 3508 } 3509 3510 static inline bool ext4_is_quota_journalled(struct super_block *sb) 3511 { 3512 struct ext4_sb_info *sbi = EXT4_SB(sb); 3513 3514 return (ext4_has_feature_quota(sb) || 3515 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]); 3516 } 3517 int ext4_enable_quotas(struct super_block *sb); 3518 #endif 3519 3520 /* 3521 * Block validity checking 3522 */ 3523 #define ext4_check_indirect_blockref(inode, bh) \ 3524 ext4_check_blockref(__func__, __LINE__, inode, \ 3525 (__le32 *)(bh)->b_data, \ 3526 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 3527 3528 #define ext4_ind_check_inode(inode) \ 3529 ext4_check_blockref(__func__, __LINE__, inode, \ 3530 EXT4_I(inode)->i_data, \ 3531 EXT4_NDIR_BLOCKS) 3532 3533 /* 3534 * Inodes and files operations 3535 */ 3536 3537 /* dir.c */ 3538 extern const struct file_operations ext4_dir_operations; 3539 3540 /* file.c */ 3541 extern const struct inode_operations ext4_file_inode_operations; 3542 extern const struct file_operations ext4_file_operations; 3543 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 3544 3545 /* inline.c */ 3546 extern int ext4_get_max_inline_size(struct inode *inode); 3547 extern int ext4_find_inline_data_nolock(struct inode *inode); 3548 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 3549 3550 int ext4_readpage_inline(struct inode *inode, struct folio *folio); 3551 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 3552 struct inode *inode, 3553 loff_t pos, unsigned len, 3554 struct page **pagep); 3555 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len, 3556 unsigned copied, struct folio *folio); 3557 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 3558 struct inode *inode, 3559 loff_t pos, unsigned len, 3560 struct page **pagep, 3561 void **fsdata); 3562 extern int ext4_try_add_inline_entry(handle_t *handle, 3563 struct ext4_filename *fname, 3564 struct inode *dir, struct inode *inode); 3565 extern int ext4_try_create_inline_dir(handle_t *handle, 3566 struct inode *parent, 3567 struct inode *inode); 3568 extern int ext4_read_inline_dir(struct file *filp, 3569 struct dir_context *ctx, 3570 int *has_inline_data); 3571 extern int ext4_inlinedir_to_tree(struct file *dir_file, 3572 struct inode *dir, ext4_lblk_t block, 3573 struct dx_hash_info *hinfo, 3574 __u32 start_hash, __u32 start_minor_hash, 3575 int *has_inline_data); 3576 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3577 struct ext4_filename *fname, 3578 struct ext4_dir_entry_2 **res_dir, 3579 int *has_inline_data); 3580 extern int ext4_delete_inline_entry(handle_t *handle, 3581 struct inode *dir, 3582 struct ext4_dir_entry_2 *de_del, 3583 struct buffer_head *bh, 3584 int *has_inline_data); 3585 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); 3586 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3587 struct ext4_dir_entry_2 **parent_de, 3588 int *retval); 3589 extern void *ext4_read_inline_link(struct inode *inode); 3590 3591 struct iomap; 3592 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap); 3593 3594 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3595 3596 extern int ext4_convert_inline_data(struct inode *inode); 3597 3598 static inline int ext4_has_inline_data(struct inode *inode) 3599 { 3600 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3601 EXT4_I(inode)->i_inline_off; 3602 } 3603 3604 /* namei.c */ 3605 extern const struct inode_operations ext4_dir_inode_operations; 3606 extern const struct inode_operations ext4_special_inode_operations; 3607 extern struct dentry *ext4_get_parent(struct dentry *child); 3608 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3609 struct ext4_dir_entry_2 *de, 3610 int blocksize, int csum_size, 3611 unsigned int parent_ino, int dotdot_real_len); 3612 extern void ext4_initialize_dirent_tail(struct buffer_head *bh, 3613 unsigned int blocksize); 3614 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode, 3615 struct buffer_head *bh); 3616 extern int __ext4_unlink(struct inode *dir, const struct qstr *d_name, 3617 struct inode *inode, struct dentry *dentry); 3618 extern int __ext4_link(struct inode *dir, struct inode *inode, 3619 struct dentry *dentry); 3620 3621 #define S_SHIFT 12 3622 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = { 3623 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3624 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3625 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3626 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3627 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3628 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3629 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3630 }; 3631 3632 static inline void ext4_set_de_type(struct super_block *sb, 3633 struct ext4_dir_entry_2 *de, 3634 umode_t mode) { 3635 if (ext4_has_feature_filetype(sb)) 3636 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3637 } 3638 3639 /* readpages.c */ 3640 extern int ext4_mpage_readpages(struct inode *inode, 3641 struct readahead_control *rac, struct folio *folio); 3642 extern int __init ext4_init_post_read_processing(void); 3643 extern void ext4_exit_post_read_processing(void); 3644 3645 /* symlink.c */ 3646 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3647 extern const struct inode_operations ext4_symlink_inode_operations; 3648 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3649 3650 /* sysfs.c */ 3651 extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi); 3652 extern int ext4_register_sysfs(struct super_block *sb); 3653 extern void ext4_unregister_sysfs(struct super_block *sb); 3654 extern int __init ext4_init_sysfs(void); 3655 extern void ext4_exit_sysfs(void); 3656 3657 /* block_validity */ 3658 extern void ext4_release_system_zone(struct super_block *sb); 3659 extern int ext4_setup_system_zone(struct super_block *sb); 3660 extern int __init ext4_init_system_zone(void); 3661 extern void ext4_exit_system_zone(void); 3662 extern int ext4_inode_block_valid(struct inode *inode, 3663 ext4_fsblk_t start_blk, 3664 unsigned int count); 3665 extern int ext4_check_blockref(const char *, unsigned int, 3666 struct inode *, __le32 *, unsigned int); 3667 extern int ext4_sb_block_valid(struct super_block *sb, struct inode *inode, 3668 ext4_fsblk_t start_blk, unsigned int count); 3669 3670 3671 /* extents.c */ 3672 struct ext4_ext_path; 3673 struct ext4_extent; 3674 3675 /* 3676 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3677 * __le32. 3678 */ 3679 #define EXT_MAX_BLOCKS 0xffffffff 3680 3681 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode); 3682 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3683 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3684 struct ext4_map_blocks *map, int flags); 3685 extern int ext4_ext_truncate(handle_t *, struct inode *); 3686 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3687 ext4_lblk_t end); 3688 extern void ext4_ext_init(struct super_block *); 3689 extern void ext4_ext_release(struct super_block *); 3690 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3691 loff_t len); 3692 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3693 loff_t offset, ssize_t len); 3694 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle, 3695 ext4_io_end_t *io_end); 3696 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3697 struct ext4_map_blocks *map, int flags); 3698 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3699 int num, 3700 struct ext4_ext_path *path); 3701 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3702 struct ext4_ext_path **, 3703 struct ext4_extent *, int); 3704 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3705 struct ext4_ext_path **, 3706 int flags); 3707 extern void ext4_free_ext_path(struct ext4_ext_path *); 3708 extern int ext4_ext_check_inode(struct inode *inode); 3709 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3710 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3711 __u64 start, __u64 len); 3712 extern int ext4_get_es_cache(struct inode *inode, 3713 struct fiemap_extent_info *fieinfo, 3714 __u64 start, __u64 len); 3715 extern int ext4_ext_precache(struct inode *inode); 3716 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3717 struct inode *inode2, ext4_lblk_t lblk1, 3718 ext4_lblk_t lblk2, ext4_lblk_t count, 3719 int mark_unwritten,int *err); 3720 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu); 3721 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode, 3722 int check_cred, int restart_cred, 3723 int revoke_cred); 3724 extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end); 3725 extern int ext4_ext_replay_set_iblocks(struct inode *inode); 3726 extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start, 3727 int len, int unwritten, ext4_fsblk_t pblk); 3728 extern int ext4_ext_clear_bb(struct inode *inode); 3729 3730 3731 /* move_extent.c */ 3732 extern void ext4_double_down_write_data_sem(struct inode *first, 3733 struct inode *second); 3734 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3735 struct inode *donor_inode); 3736 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3737 __u64 start_orig, __u64 start_donor, 3738 __u64 len, __u64 *moved_len); 3739 3740 /* page-io.c */ 3741 extern int __init ext4_init_pageio(void); 3742 extern void ext4_exit_pageio(void); 3743 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3744 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3745 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3746 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3747 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3748 struct writeback_control *wbc); 3749 extern void ext4_end_io_rsv_work(struct work_struct *work); 3750 extern void ext4_io_submit(struct ext4_io_submit *io); 3751 int ext4_bio_write_folio(struct ext4_io_submit *io, struct folio *page, 3752 size_t len); 3753 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end); 3754 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end); 3755 3756 /* mmp.c */ 3757 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3758 3759 /* mmp.c */ 3760 extern void ext4_stop_mmpd(struct ext4_sb_info *sbi); 3761 3762 /* verity.c */ 3763 extern const struct fsverity_operations ext4_verityops; 3764 3765 /* orphan.c */ 3766 extern int ext4_orphan_add(handle_t *, struct inode *); 3767 extern int ext4_orphan_del(handle_t *, struct inode *); 3768 extern void ext4_orphan_cleanup(struct super_block *sb, 3769 struct ext4_super_block *es); 3770 extern void ext4_release_orphan_info(struct super_block *sb); 3771 extern int ext4_init_orphan_info(struct super_block *sb); 3772 extern int ext4_orphan_file_empty(struct super_block *sb); 3773 extern void ext4_orphan_file_block_trigger( 3774 struct jbd2_buffer_trigger_type *triggers, 3775 struct buffer_head *bh, 3776 void *data, size_t size); 3777 3778 /* 3779 * Add new method to test whether block and inode bitmaps are properly 3780 * initialized. With uninit_bg reading the block from disk is not enough 3781 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3782 */ 3783 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3784 3785 static inline int bitmap_uptodate(struct buffer_head *bh) 3786 { 3787 return (buffer_uptodate(bh) && 3788 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3789 } 3790 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3791 { 3792 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3793 } 3794 3795 /* For ioend & aio unwritten conversion wait queues */ 3796 #define EXT4_WQ_HASH_SZ 37 3797 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3798 EXT4_WQ_HASH_SZ]) 3799 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3800 3801 extern int ext4_resize_begin(struct super_block *sb); 3802 extern int ext4_resize_end(struct super_block *sb, bool update_backups); 3803 3804 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 3805 struct ext4_io_end *io_end) 3806 { 3807 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 3808 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3809 atomic_inc(&EXT4_I(inode)->i_unwritten); 3810 } 3811 } 3812 3813 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3814 { 3815 struct inode *inode = io_end->inode; 3816 3817 if (io_end->flag & EXT4_IO_END_UNWRITTEN) { 3818 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3819 /* Wake up anyone waiting on unwritten extent conversion */ 3820 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) 3821 wake_up_all(ext4_ioend_wq(inode)); 3822 } 3823 } 3824 3825 extern const struct iomap_ops ext4_iomap_ops; 3826 extern const struct iomap_ops ext4_iomap_overwrite_ops; 3827 extern const struct iomap_ops ext4_iomap_report_ops; 3828 3829 static inline int ext4_buffer_uptodate(struct buffer_head *bh) 3830 { 3831 /* 3832 * If the buffer has the write error flag, we have failed 3833 * to write out data in the block. In this case, we don't 3834 * have to read the block because we may read the old data 3835 * successfully. 3836 */ 3837 if (buffer_write_io_error(bh)) 3838 set_buffer_uptodate(bh); 3839 return buffer_uptodate(bh); 3840 } 3841 3842 #endif /* __KERNEL__ */ 3843 3844 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3845 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3846 3847 #endif /* _EXT4_H */ 3848