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 217 * CR_POWER2_ALIGNED */ 218 #define EXT4_MB_CR_POWER2_ALIGNED_OPTIMIZED 0x8000 219 /* Avg fragment size rb tree lookup succeeded at least once for 220 * CR_GOAL_LEN_FAST */ 221 #define EXT4_MB_CR_GOAL_LEN_FAST_OPTIMIZED 0x00010000 222 /* Avg fragment size rb tree lookup succeeded at least once for 223 * CR_BEST_AVAIL_LEN */ 224 #define EXT4_MB_CR_BEST_AVAIL_LEN_OPTIMIZED 0x00020000 225 226 struct ext4_allocation_request { 227 /* target inode for block we're allocating */ 228 struct inode *inode; 229 /* how many blocks we want to allocate */ 230 unsigned int len; 231 /* logical block in target inode */ 232 ext4_lblk_t logical; 233 /* the closest logical allocated block to the left */ 234 ext4_lblk_t lleft; 235 /* the closest logical allocated block to the right */ 236 ext4_lblk_t lright; 237 /* phys. target (a hint) */ 238 ext4_fsblk_t goal; 239 /* phys. block for the closest logical allocated block to the left */ 240 ext4_fsblk_t pleft; 241 /* phys. block for the closest logical allocated block to the right */ 242 ext4_fsblk_t pright; 243 /* flags. see above EXT4_MB_HINT_* */ 244 unsigned int flags; 245 }; 246 247 /* 248 * Logical to physical block mapping, used by ext4_map_blocks() 249 * 250 * This structure is used to pass requests into ext4_map_blocks() as 251 * well as to store the information returned by ext4_map_blocks(). It 252 * takes less room on the stack than a struct buffer_head. 253 */ 254 #define EXT4_MAP_NEW BIT(BH_New) 255 #define EXT4_MAP_MAPPED BIT(BH_Mapped) 256 #define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten) 257 #define EXT4_MAP_BOUNDARY BIT(BH_Boundary) 258 #define EXT4_MAP_DELAYED BIT(BH_Delay) 259 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 260 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\ 261 EXT4_MAP_DELAYED) 262 263 struct ext4_map_blocks { 264 ext4_fsblk_t m_pblk; 265 ext4_lblk_t m_lblk; 266 unsigned int m_len; 267 unsigned int m_flags; 268 }; 269 270 /* 271 * Block validity checking, system zone rbtree. 272 */ 273 struct ext4_system_blocks { 274 struct rb_root root; 275 struct rcu_head rcu; 276 }; 277 278 /* 279 * Flags for ext4_io_end->flags 280 */ 281 #define EXT4_IO_END_UNWRITTEN 0x0001 282 283 struct ext4_io_end_vec { 284 struct list_head list; /* list of io_end_vec */ 285 loff_t offset; /* offset in the file */ 286 ssize_t size; /* size of the extent */ 287 }; 288 289 /* 290 * For converting unwritten extents on a work queue. 'handle' is used for 291 * buffered writeback. 292 */ 293 typedef struct ext4_io_end { 294 struct list_head list; /* per-file finished IO list */ 295 handle_t *handle; /* handle reserved for extent 296 * conversion */ 297 struct inode *inode; /* file being written to */ 298 struct bio *bio; /* Linked list of completed 299 * bios covering the extent */ 300 unsigned int flag; /* unwritten or not */ 301 refcount_t count; /* reference counter */ 302 struct list_head list_vec; /* list of ext4_io_end_vec */ 303 } ext4_io_end_t; 304 305 struct ext4_io_submit { 306 struct writeback_control *io_wbc; 307 struct bio *io_bio; 308 ext4_io_end_t *io_end; 309 sector_t io_next_block; 310 }; 311 312 /* 313 * Special inodes numbers 314 */ 315 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 316 #define EXT4_ROOT_INO 2 /* Root inode */ 317 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 318 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 319 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 320 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 321 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 322 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 323 324 /* First non-reserved inode for old ext4 filesystems */ 325 #define EXT4_GOOD_OLD_FIRST_INO 11 326 327 /* 328 * Maximal count of links to a file 329 */ 330 #define EXT4_LINK_MAX 65000 331 332 /* 333 * Macro-instructions used to manage several block sizes 334 */ 335 #define EXT4_MIN_BLOCK_SIZE 1024 336 #define EXT4_MAX_BLOCK_SIZE 65536 337 #define EXT4_MIN_BLOCK_LOG_SIZE 10 338 #define EXT4_MAX_BLOCK_LOG_SIZE 16 339 #define EXT4_MAX_CLUSTER_LOG_SIZE 30 340 #ifdef __KERNEL__ 341 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 342 #else 343 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 344 #endif 345 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 346 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 347 EXT4_SB(s)->s_cluster_bits) 348 #ifdef __KERNEL__ 349 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 350 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 351 #else 352 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 353 #endif 354 #ifdef __KERNEL__ 355 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 356 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 357 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 358 #else 359 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 360 EXT4_GOOD_OLD_INODE_SIZE : \ 361 (s)->s_inode_size) 362 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 363 EXT4_GOOD_OLD_FIRST_INO : \ 364 (s)->s_first_ino) 365 #endif 366 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 367 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \ 368 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \ 369 blkbits)) 370 371 /* Translate a block number to a cluster number */ 372 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 373 /* Translate a cluster number to a block number */ 374 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 375 /* Translate # of blks to # of clusters */ 376 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 377 (sbi)->s_cluster_bits) 378 /* Mask out the low bits to get the starting block of the cluster */ 379 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 380 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 381 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 382 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 383 /* Fill in the low bits to get the last block of the cluster */ 384 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \ 385 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1)) 386 /* Get the cluster offset */ 387 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 388 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 389 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 390 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 391 392 /* 393 * Structure of a blocks group descriptor 394 */ 395 struct ext4_group_desc 396 { 397 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 398 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 399 __le32 bg_inode_table_lo; /* Inodes table block */ 400 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 401 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 402 __le16 bg_used_dirs_count_lo; /* Directories count */ 403 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 404 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 405 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 406 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 407 __le16 bg_itable_unused_lo; /* Unused inodes count */ 408 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 409 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 410 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 411 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 412 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 413 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 414 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 415 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 416 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 417 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 418 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 419 __u32 bg_reserved; 420 }; 421 422 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 423 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 424 sizeof(__le16)) 425 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 426 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 427 sizeof(__le16)) 428 429 /* 430 * Structure of a flex block group info 431 */ 432 433 struct flex_groups { 434 atomic64_t free_clusters; 435 atomic_t free_inodes; 436 atomic_t used_dirs; 437 }; 438 439 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 440 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 441 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 442 443 /* 444 * Macro-instructions used to manage group descriptors 445 */ 446 #define EXT4_MIN_DESC_SIZE 32 447 #define EXT4_MIN_DESC_SIZE_64BIT 64 448 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 449 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 450 #ifdef __KERNEL__ 451 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 452 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 453 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 454 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 455 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 456 #else 457 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 458 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 459 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 460 #endif 461 462 /* 463 * Constants relative to the data blocks 464 */ 465 #define EXT4_NDIR_BLOCKS 12 466 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 467 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 468 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 469 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 470 471 /* 472 * Inode flags 473 */ 474 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 475 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 476 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 477 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 478 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 479 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 480 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 481 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 482 /* Reserved for compression usage... */ 483 #define EXT4_DIRTY_FL 0x00000100 484 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 485 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 486 /* nb: was previously EXT2_ECOMPR_FL */ 487 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 488 /* End compression flags --- maybe not all used */ 489 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 490 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 491 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 492 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 493 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 494 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 495 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 496 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 497 #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */ 498 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 499 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */ 500 501 #define EXT4_DAX_FL 0x02000000 /* Inode is DAX */ 502 503 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 504 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 505 #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */ 506 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 507 508 /* User modifiable flags */ 509 #define EXT4_FL_USER_MODIFIABLE (EXT4_SECRM_FL | \ 510 EXT4_UNRM_FL | \ 511 EXT4_COMPR_FL | \ 512 EXT4_SYNC_FL | \ 513 EXT4_IMMUTABLE_FL | \ 514 EXT4_APPEND_FL | \ 515 EXT4_NODUMP_FL | \ 516 EXT4_NOATIME_FL | \ 517 EXT4_JOURNAL_DATA_FL | \ 518 EXT4_NOTAIL_FL | \ 519 EXT4_DIRSYNC_FL | \ 520 EXT4_TOPDIR_FL | \ 521 EXT4_EXTENTS_FL | \ 522 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \ 523 EXT4_DAX_FL | \ 524 EXT4_PROJINHERIT_FL | \ 525 EXT4_CASEFOLD_FL) 526 527 /* User visible flags */ 528 #define EXT4_FL_USER_VISIBLE (EXT4_FL_USER_MODIFIABLE | \ 529 EXT4_DIRTY_FL | \ 530 EXT4_COMPRBLK_FL | \ 531 EXT4_NOCOMPR_FL | \ 532 EXT4_ENCRYPT_FL | \ 533 EXT4_INDEX_FL | \ 534 EXT4_VERITY_FL | \ 535 EXT4_INLINE_DATA_FL) 536 537 /* Flags that should be inherited by new inodes from their parent. */ 538 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 539 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 540 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 541 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 542 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\ 543 EXT4_DAX_FL) 544 545 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 546 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\ 547 EXT4_PROJINHERIT_FL)) 548 549 /* Flags that are appropriate for non-directories/regular files. */ 550 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 551 552 /* The only flags that should be swapped */ 553 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL) 554 555 /* Flags which are mutually exclusive to DAX */ 556 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\ 557 EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL) 558 559 /* Mask out flags that are inappropriate for the given type of inode. */ 560 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 561 { 562 if (S_ISDIR(mode)) 563 return flags; 564 else if (S_ISREG(mode)) 565 return flags & EXT4_REG_FLMASK; 566 else 567 return flags & EXT4_OTHER_FLMASK; 568 } 569 570 /* 571 * Inode flags used for atomic set/get 572 */ 573 enum { 574 EXT4_INODE_SECRM = 0, /* Secure deletion */ 575 EXT4_INODE_UNRM = 1, /* Undelete */ 576 EXT4_INODE_COMPR = 2, /* Compress file */ 577 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 578 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 579 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 580 EXT4_INODE_NODUMP = 6, /* do not dump file */ 581 EXT4_INODE_NOATIME = 7, /* do not update atime */ 582 /* Reserved for compression usage... */ 583 EXT4_INODE_DIRTY = 8, 584 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 585 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 586 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 587 /* End compression flags --- maybe not all used */ 588 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 589 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 590 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 591 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 592 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 593 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 594 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 595 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 596 EXT4_INODE_VERITY = 20, /* Verity protected inode */ 597 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 598 /* 22 was formerly EXT4_INODE_EOFBLOCKS */ 599 EXT4_INODE_DAX = 25, /* Inode is DAX */ 600 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 601 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 602 EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */ 603 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 604 }; 605 606 /* 607 * Since it's pretty easy to mix up bit numbers and hex values, we use a 608 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 609 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 610 * any extra space in the compiled kernel image, otherwise, the build will fail. 611 * It's important that these values are the same, since we are using 612 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 613 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 614 * values found in ext2, ext3 and ext4 filesystems, and of course the values 615 * defined in e2fsprogs. 616 * 617 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 618 */ 619 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1U << EXT4_INODE_##FLAG)) 620 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 621 622 static inline void ext4_check_flag_values(void) 623 { 624 CHECK_FLAG_VALUE(SECRM); 625 CHECK_FLAG_VALUE(UNRM); 626 CHECK_FLAG_VALUE(COMPR); 627 CHECK_FLAG_VALUE(SYNC); 628 CHECK_FLAG_VALUE(IMMUTABLE); 629 CHECK_FLAG_VALUE(APPEND); 630 CHECK_FLAG_VALUE(NODUMP); 631 CHECK_FLAG_VALUE(NOATIME); 632 CHECK_FLAG_VALUE(DIRTY); 633 CHECK_FLAG_VALUE(COMPRBLK); 634 CHECK_FLAG_VALUE(NOCOMPR); 635 CHECK_FLAG_VALUE(ENCRYPT); 636 CHECK_FLAG_VALUE(INDEX); 637 CHECK_FLAG_VALUE(IMAGIC); 638 CHECK_FLAG_VALUE(JOURNAL_DATA); 639 CHECK_FLAG_VALUE(NOTAIL); 640 CHECK_FLAG_VALUE(DIRSYNC); 641 CHECK_FLAG_VALUE(TOPDIR); 642 CHECK_FLAG_VALUE(HUGE_FILE); 643 CHECK_FLAG_VALUE(EXTENTS); 644 CHECK_FLAG_VALUE(VERITY); 645 CHECK_FLAG_VALUE(EA_INODE); 646 CHECK_FLAG_VALUE(INLINE_DATA); 647 CHECK_FLAG_VALUE(PROJINHERIT); 648 CHECK_FLAG_VALUE(CASEFOLD); 649 CHECK_FLAG_VALUE(RESERVED); 650 } 651 652 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 653 struct compat_ext4_new_group_input { 654 u32 group; 655 compat_u64 block_bitmap; 656 compat_u64 inode_bitmap; 657 compat_u64 inode_table; 658 u32 blocks_count; 659 u16 reserved_blocks; 660 u16 unused; 661 }; 662 #endif 663 664 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 665 struct ext4_new_group_data { 666 __u32 group; 667 __u64 block_bitmap; 668 __u64 inode_bitmap; 669 __u64 inode_table; 670 __u32 blocks_count; 671 __u16 reserved_blocks; 672 __u16 mdata_blocks; 673 __u32 free_clusters_count; 674 }; 675 676 /* Indexes used to index group tables in ext4_new_group_data */ 677 enum { 678 BLOCK_BITMAP = 0, /* block bitmap */ 679 INODE_BITMAP, /* inode bitmap */ 680 INODE_TABLE, /* inode tables */ 681 GROUP_TABLE_COUNT, 682 }; 683 684 /* 685 * Flags used by ext4_map_blocks() 686 */ 687 /* Allocate any needed blocks and/or convert an unwritten 688 extent to be an initialized ext4 */ 689 #define EXT4_GET_BLOCKS_CREATE 0x0001 690 /* Request the creation of an unwritten extent */ 691 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 692 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 693 EXT4_GET_BLOCKS_CREATE) 694 /* Caller is from the delayed allocation writeout path 695 * finally doing the actual allocation of delayed blocks */ 696 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 697 /* caller is from the direct IO path, request to creation of an 698 unwritten extents if not allocated, split the unwritten 699 extent if blocks has been preallocated already*/ 700 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 701 #define EXT4_GET_BLOCKS_CONVERT 0x0010 702 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 703 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 704 /* Convert extent to initialized after IO complete */ 705 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 706 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 707 /* Eventual metadata allocation (due to growing extent tree) 708 * should not fail, so try to use reserved blocks for that.*/ 709 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 710 /* Don't normalize allocation size (used for fallocate) */ 711 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 712 /* Convert written extents to unwritten */ 713 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 714 /* Write zeros to newly created written extents */ 715 #define EXT4_GET_BLOCKS_ZERO 0x0200 716 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 717 EXT4_GET_BLOCKS_ZERO) 718 /* Caller will submit data before dropping transaction handle. This 719 * allows jbd2 to avoid submitting data before commit. */ 720 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 721 /* Caller is in the atomic contex, find extent if it has been cached */ 722 #define EXT4_GET_BLOCKS_CACHED_NOWAIT 0x0800 723 724 /* 725 * The bit position of these flags must not overlap with any of the 726 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 727 * read_extent_tree_block(), ext4_split_extent_at(), 728 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 729 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 730 * caching the extents when reading from the extent tree while a 731 * truncate or punch hole operation is in progress. 732 */ 733 #define EXT4_EX_NOCACHE 0x40000000 734 #define EXT4_EX_FORCE_CACHE 0x20000000 735 #define EXT4_EX_NOFAIL 0x10000000 736 737 /* 738 * Flags used by ext4_free_blocks 739 */ 740 #define EXT4_FREE_BLOCKS_METADATA 0x0001 741 #define EXT4_FREE_BLOCKS_FORGET 0x0002 742 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 743 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 744 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 745 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 746 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040 747 748 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 749 /* 750 * ioctl commands in 32 bit emulation 751 */ 752 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 753 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 754 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 755 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 756 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 757 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 758 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 759 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 760 #endif 761 762 /* Max physical block we can address w/o extents */ 763 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 764 765 /* Max logical block we can support */ 766 #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE 767 768 /* 769 * Structure of an inode on the disk 770 */ 771 struct ext4_inode { 772 __le16 i_mode; /* File mode */ 773 __le16 i_uid; /* Low 16 bits of Owner Uid */ 774 __le32 i_size_lo; /* Size in bytes */ 775 __le32 i_atime; /* Access time */ 776 __le32 i_ctime; /* Inode Change time */ 777 __le32 i_mtime; /* Modification time */ 778 __le32 i_dtime; /* Deletion Time */ 779 __le16 i_gid; /* Low 16 bits of Group Id */ 780 __le16 i_links_count; /* Links count */ 781 __le32 i_blocks_lo; /* Blocks count */ 782 __le32 i_flags; /* File flags */ 783 union { 784 struct { 785 __le32 l_i_version; 786 } linux1; 787 struct { 788 __u32 h_i_translator; 789 } hurd1; 790 struct { 791 __u32 m_i_reserved1; 792 } masix1; 793 } osd1; /* OS dependent 1 */ 794 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 795 __le32 i_generation; /* File version (for NFS) */ 796 __le32 i_file_acl_lo; /* File ACL */ 797 __le32 i_size_high; 798 __le32 i_obso_faddr; /* Obsoleted fragment address */ 799 union { 800 struct { 801 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 802 __le16 l_i_file_acl_high; 803 __le16 l_i_uid_high; /* these 2 fields */ 804 __le16 l_i_gid_high; /* were reserved2[0] */ 805 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 806 __le16 l_i_reserved; 807 } linux2; 808 struct { 809 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 810 __u16 h_i_mode_high; 811 __u16 h_i_uid_high; 812 __u16 h_i_gid_high; 813 __u32 h_i_author; 814 } hurd2; 815 struct { 816 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 817 __le16 m_i_file_acl_high; 818 __u32 m_i_reserved2[2]; 819 } masix2; 820 } osd2; /* OS dependent 2 */ 821 __le16 i_extra_isize; 822 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 823 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 824 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 825 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 826 __le32 i_crtime; /* File Creation time */ 827 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 828 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 829 __le32 i_projid; /* Project ID */ 830 }; 831 832 #define EXT4_EPOCH_BITS 2 833 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 834 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 835 836 /* 837 * Extended fields will fit into an inode if the filesystem was formatted 838 * with large inodes (-I 256 or larger) and there are not currently any EAs 839 * consuming all of the available space. For new inodes we always reserve 840 * enough space for the kernel's known extended fields, but for inodes 841 * created with an old kernel this might not have been the case. None of 842 * the extended inode fields is critical for correct filesystem operation. 843 * This macro checks if a certain field fits in the inode. Note that 844 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 845 */ 846 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 847 ((offsetof(typeof(*ext4_inode), field) + \ 848 sizeof((ext4_inode)->field)) \ 849 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 850 (einode)->i_extra_isize)) \ 851 852 /* 853 * We use an encoding that preserves the times for extra epoch "00": 854 * 855 * extra msb of adjust for signed 856 * epoch 32-bit 32-bit tv_sec to 857 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 858 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 859 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 860 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 861 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 862 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 863 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 864 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 865 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 866 * 867 * Note that previous versions of the kernel on 64-bit systems would 868 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 869 * 1970. e2fsck will correct this, assuming that it is run on the 870 * affected filesystem before 2242. 871 */ 872 873 static inline __le32 ext4_encode_extra_time(struct timespec64 ts) 874 { 875 u32 extra = ((ts.tv_sec - (s32)ts.tv_sec) >> 32) & EXT4_EPOCH_MASK; 876 return cpu_to_le32(extra | (ts.tv_nsec << EXT4_EPOCH_BITS)); 877 } 878 879 static inline struct timespec64 ext4_decode_extra_time(__le32 base, 880 __le32 extra) 881 { 882 struct timespec64 ts = { .tv_sec = (signed)le32_to_cpu(base) }; 883 884 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) 885 ts.tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 886 ts.tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 887 return ts; 888 } 889 890 #define EXT4_INODE_SET_XTIME_VAL(xtime, inode, raw_inode, ts) \ 891 do { \ 892 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \ 893 (raw_inode)->xtime = cpu_to_le32((ts).tv_sec); \ 894 (raw_inode)->xtime ## _extra = ext4_encode_extra_time(ts); \ 895 } else \ 896 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (ts).tv_sec, S32_MIN, S32_MAX)); \ 897 } while (0) 898 899 #define EXT4_INODE_SET_ATIME(inode, raw_inode) \ 900 EXT4_INODE_SET_XTIME_VAL(i_atime, inode, raw_inode, inode_get_atime(inode)) 901 902 #define EXT4_INODE_SET_MTIME(inode, raw_inode) \ 903 EXT4_INODE_SET_XTIME_VAL(i_mtime, inode, raw_inode, inode_get_mtime(inode)) 904 905 #define EXT4_INODE_SET_CTIME(inode, raw_inode) \ 906 EXT4_INODE_SET_XTIME_VAL(i_ctime, inode, raw_inode, inode_get_ctime(inode)) 907 908 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 909 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 910 EXT4_INODE_SET_XTIME_VAL(xtime, &((einode)->vfs_inode), \ 911 raw_inode, (einode)->xtime) 912 913 #define EXT4_INODE_GET_XTIME_VAL(xtime, inode, raw_inode) \ 914 (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra) ? \ 915 ext4_decode_extra_time((raw_inode)->xtime, \ 916 (raw_inode)->xtime ## _extra) : \ 917 (struct timespec64) { \ 918 .tv_sec = (signed)le32_to_cpu((raw_inode)->xtime) \ 919 }) 920 921 #define EXT4_INODE_GET_ATIME(inode, raw_inode) \ 922 do { \ 923 inode_set_atime_to_ts(inode, \ 924 EXT4_INODE_GET_XTIME_VAL(i_atime, inode, raw_inode)); \ 925 } while (0) 926 927 #define EXT4_INODE_GET_MTIME(inode, raw_inode) \ 928 do { \ 929 inode_set_mtime_to_ts(inode, \ 930 EXT4_INODE_GET_XTIME_VAL(i_mtime, inode, raw_inode)); \ 931 } while (0) 932 933 #define EXT4_INODE_GET_CTIME(inode, raw_inode) \ 934 do { \ 935 inode_set_ctime_to_ts(inode, \ 936 EXT4_INODE_GET_XTIME_VAL(i_ctime, inode, raw_inode)); \ 937 } while (0) 938 939 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 940 do { \ 941 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 942 (einode)->xtime = \ 943 EXT4_INODE_GET_XTIME_VAL(xtime, &(einode->vfs_inode), \ 944 raw_inode); \ 945 else \ 946 (einode)->xtime = (struct timespec64){0, 0}; \ 947 } while (0) 948 949 #define i_disk_version osd1.linux1.l_i_version 950 951 #if defined(__KERNEL__) || defined(__linux__) 952 #define i_reserved1 osd1.linux1.l_i_reserved1 953 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 954 #define i_blocks_high osd2.linux2.l_i_blocks_high 955 #define i_uid_low i_uid 956 #define i_gid_low i_gid 957 #define i_uid_high osd2.linux2.l_i_uid_high 958 #define i_gid_high osd2.linux2.l_i_gid_high 959 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 960 961 #elif defined(__GNU__) 962 963 #define i_translator osd1.hurd1.h_i_translator 964 #define i_uid_high osd2.hurd2.h_i_uid_high 965 #define i_gid_high osd2.hurd2.h_i_gid_high 966 #define i_author osd2.hurd2.h_i_author 967 968 #elif defined(__masix__) 969 970 #define i_reserved1 osd1.masix1.m_i_reserved1 971 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 972 #define i_reserved2 osd2.masix2.m_i_reserved2 973 974 #endif /* defined(__KERNEL__) || defined(__linux__) */ 975 976 #include "extents_status.h" 977 #include "fast_commit.h" 978 979 /* 980 * Lock subclasses for i_data_sem in the ext4_inode_info structure. 981 * 982 * These are needed to avoid lockdep false positives when we need to 983 * allocate blocks to the quota inode during ext4_map_blocks(), while 984 * holding i_data_sem for a normal (non-quota) inode. Since we don't 985 * do quota tracking for the quota inode, this avoids deadlock (as 986 * well as infinite recursion, since it isn't turtles all the way 987 * down...) 988 * 989 * I_DATA_SEM_NORMAL - Used for most inodes 990 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode 991 * where the second inode has larger inode number 992 * than the first 993 * I_DATA_SEM_QUOTA - Used for quota inodes only 994 * I_DATA_SEM_EA - Used for ea_inodes only 995 */ 996 enum { 997 I_DATA_SEM_NORMAL = 0, 998 I_DATA_SEM_OTHER, 999 I_DATA_SEM_QUOTA, 1000 I_DATA_SEM_EA 1001 }; 1002 1003 1004 /* 1005 * fourth extended file system inode data in memory 1006 */ 1007 struct ext4_inode_info { 1008 __le32 i_data[15]; /* unconverted */ 1009 __u32 i_dtime; 1010 ext4_fsblk_t i_file_acl; 1011 1012 /* 1013 * i_block_group is the number of the block group which contains 1014 * this file's inode. Constant across the lifetime of the inode, 1015 * it is used for making block allocation decisions - we try to 1016 * place a file's data blocks near its inode block, and new inodes 1017 * near to their parent directory's inode. 1018 */ 1019 ext4_group_t i_block_group; 1020 ext4_lblk_t i_dir_start_lookup; 1021 #if (BITS_PER_LONG < 64) 1022 unsigned long i_state_flags; /* Dynamic state flags */ 1023 #endif 1024 unsigned long i_flags; 1025 1026 /* 1027 * Extended attributes can be read independently of the main file 1028 * data. Taking i_rwsem even when reading would cause contention 1029 * between readers of EAs and writers of regular file data, so 1030 * instead we synchronize on xattr_sem when reading or changing 1031 * EAs. 1032 */ 1033 struct rw_semaphore xattr_sem; 1034 1035 /* 1036 * Inodes with EXT4_STATE_ORPHAN_FILE use i_orphan_idx. Otherwise 1037 * i_orphan is used. 1038 */ 1039 union { 1040 struct list_head i_orphan; /* unlinked but open inodes */ 1041 unsigned int i_orphan_idx; /* Index in orphan file */ 1042 }; 1043 1044 /* Fast commit related info */ 1045 1046 /* For tracking dentry create updates */ 1047 struct list_head i_fc_dilist; 1048 struct list_head i_fc_list; /* 1049 * inodes that need fast commit 1050 * protected by sbi->s_fc_lock. 1051 */ 1052 1053 /* Start of lblk range that needs to be committed in this fast commit */ 1054 ext4_lblk_t i_fc_lblk_start; 1055 1056 /* End of lblk range that needs to be committed in this fast commit */ 1057 ext4_lblk_t i_fc_lblk_len; 1058 1059 /* Number of ongoing updates on this inode */ 1060 atomic_t i_fc_updates; 1061 1062 /* Fast commit wait queue for this inode */ 1063 wait_queue_head_t i_fc_wait; 1064 1065 /* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */ 1066 struct mutex i_fc_lock; 1067 1068 /* 1069 * i_disksize keeps track of what the inode size is ON DISK, not 1070 * in memory. During truncate, i_size is set to the new size by 1071 * the VFS prior to calling ext4_truncate(), but the filesystem won't 1072 * set i_disksize to 0 until the truncate is actually under way. 1073 * 1074 * The intent is that i_disksize always represents the blocks which 1075 * are used by this file. This allows recovery to restart truncate 1076 * on orphans if we crash during truncate. We actually write i_disksize 1077 * into the on-disk inode when writing inodes out, instead of i_size. 1078 * 1079 * The only time when i_disksize and i_size may be different is when 1080 * a truncate is in progress. The only things which change i_disksize 1081 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 1082 */ 1083 loff_t i_disksize; 1084 1085 /* 1086 * i_data_sem is for serialising ext4_truncate() against 1087 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 1088 * data tree are chopped off during truncate. We can't do that in 1089 * ext4 because whenever we perform intermediate commits during 1090 * truncate, the inode and all the metadata blocks *must* be in a 1091 * consistent state which allows truncation of the orphans to restart 1092 * during recovery. Hence we must fix the get_block-vs-truncate race 1093 * by other means, so we have i_data_sem. 1094 */ 1095 struct rw_semaphore i_data_sem; 1096 struct inode vfs_inode; 1097 struct jbd2_inode *jinode; 1098 1099 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 1100 1101 /* 1102 * File creation time. Its function is same as that of 1103 * struct timespec64 i_{a,c,m}time in the generic inode. 1104 */ 1105 struct timespec64 i_crtime; 1106 1107 /* mballoc */ 1108 atomic_t i_prealloc_active; 1109 struct rb_root i_prealloc_node; 1110 rwlock_t i_prealloc_lock; 1111 1112 /* extents status tree */ 1113 struct ext4_es_tree i_es_tree; 1114 rwlock_t i_es_lock; 1115 struct list_head i_es_list; 1116 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1117 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1118 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1119 extents to shrink. Protected by 1120 i_es_lock */ 1121 1122 /* ialloc */ 1123 ext4_group_t i_last_alloc_group; 1124 1125 /* allocation reservation info for delalloc */ 1126 /* In case of bigalloc, this refer to clusters rather than blocks */ 1127 unsigned int i_reserved_data_blocks; 1128 1129 /* pending cluster reservations for bigalloc file systems */ 1130 struct ext4_pending_tree i_pending_tree; 1131 1132 /* on-disk additional length */ 1133 __u16 i_extra_isize; 1134 1135 /* Indicate the inline data space. */ 1136 u16 i_inline_off; 1137 u16 i_inline_size; 1138 1139 #ifdef CONFIG_QUOTA 1140 /* quota space reservation, managed internally by quota code */ 1141 qsize_t i_reserved_quota; 1142 #endif 1143 1144 /* Lock protecting lists below */ 1145 spinlock_t i_completed_io_lock; 1146 /* 1147 * Completed IOs that need unwritten extents handling and have 1148 * transaction reserved 1149 */ 1150 struct list_head i_rsv_conversion_list; 1151 struct work_struct i_rsv_conversion_work; 1152 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 1153 1154 spinlock_t i_block_reservation_lock; 1155 1156 /* 1157 * Transactions that contain inode's metadata needed to complete 1158 * fsync and fdatasync, respectively. 1159 */ 1160 tid_t i_sync_tid; 1161 tid_t i_datasync_tid; 1162 1163 #ifdef CONFIG_QUOTA 1164 struct dquot __rcu *i_dquot[MAXQUOTAS]; 1165 #endif 1166 1167 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1168 __u32 i_csum_seed; 1169 1170 kprojid_t i_projid; 1171 }; 1172 1173 /* 1174 * File system states 1175 */ 1176 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1177 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1178 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1179 #define EXT4_FC_REPLAY 0x0020 /* Fast commit replay ongoing */ 1180 1181 /* 1182 * Misc. filesystem flags 1183 */ 1184 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1185 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1186 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1187 1188 /* 1189 * Mount flags set via mount options or defaults 1190 */ 1191 #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */ 1192 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1193 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1194 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1195 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1196 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1197 #define EXT4_MOUNT_ERRORS_MASK 0x00070 1198 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1199 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1200 #ifdef CONFIG_FS_DAX 1201 #define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */ 1202 #else 1203 #define EXT4_MOUNT_DAX_ALWAYS 0 1204 #endif 1205 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1206 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1207 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1208 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1209 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1210 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1211 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1212 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1213 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1214 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1215 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */ 1216 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota, 1217 * enable enforcement for hidden 1218 * quota files */ 1219 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable 1220 * enforcement for hidden quota 1221 * files */ 1222 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota 1223 * enforcement */ 1224 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1225 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1226 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1227 #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */ 1228 #define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000 1229 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1230 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1231 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1232 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1233 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1234 1235 /* 1236 * Mount flags set either automatically (could not be set by mount option) 1237 * based on per file system feature or property or in special cases such as 1238 * distinguishing between explicit mount option definition and default. 1239 */ 1240 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1241 specified delalloc */ 1242 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1243 size of blocksize * 8 1244 blocks */ 1245 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1246 file systems */ 1247 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1248 specified journal checksum */ 1249 1250 #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */ 1251 #define EXT4_MOUNT2_DAX_NEVER 0x00000020 /* Do not allow Direct Access */ 1252 #define EXT4_MOUNT2_DAX_INODE 0x00000040 /* For printing options only */ 1253 #define EXT4_MOUNT2_MB_OPTIMIZE_SCAN 0x00000080 /* Optimize group 1254 * scanning in mballoc 1255 */ 1256 #define EXT4_MOUNT2_ABORT 0x00000100 /* Abort filesystem */ 1257 1258 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1259 ~EXT4_MOUNT_##opt 1260 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1261 EXT4_MOUNT_##opt 1262 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1263 EXT4_MOUNT_##opt) 1264 1265 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1266 ~EXT4_MOUNT2_##opt 1267 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1268 EXT4_MOUNT2_##opt 1269 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1270 EXT4_MOUNT2_##opt) 1271 1272 #define ext4_test_and_set_bit __test_and_set_bit_le 1273 #define ext4_set_bit __set_bit_le 1274 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1275 #define ext4_clear_bit __clear_bit_le 1276 #define ext4_test_bit test_bit_le 1277 #define ext4_find_next_zero_bit find_next_zero_bit_le 1278 #define ext4_find_next_bit find_next_bit_le 1279 1280 extern void mb_set_bits(void *bm, int cur, int len); 1281 1282 /* 1283 * Maximal mount counts between two filesystem checks 1284 */ 1285 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1286 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1287 1288 /* 1289 * Behaviour when detecting errors 1290 */ 1291 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1292 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1293 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1294 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1295 1296 /* Metadata checksum algorithm codes */ 1297 #define EXT4_CRC32C_CHKSUM 1 1298 1299 #define EXT4_LABEL_MAX 16 1300 1301 /* 1302 * Structure of the super block 1303 */ 1304 struct ext4_super_block { 1305 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1306 __le32 s_blocks_count_lo; /* Blocks count */ 1307 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1308 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1309 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1310 __le32 s_first_data_block; /* First Data Block */ 1311 __le32 s_log_block_size; /* Block size */ 1312 __le32 s_log_cluster_size; /* Allocation cluster size */ 1313 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1314 __le32 s_clusters_per_group; /* # Clusters per group */ 1315 __le32 s_inodes_per_group; /* # Inodes per group */ 1316 __le32 s_mtime; /* Mount time */ 1317 /*30*/ __le32 s_wtime; /* Write time */ 1318 __le16 s_mnt_count; /* Mount count */ 1319 __le16 s_max_mnt_count; /* Maximal mount count */ 1320 __le16 s_magic; /* Magic signature */ 1321 __le16 s_state; /* File system state */ 1322 __le16 s_errors; /* Behaviour when detecting errors */ 1323 __le16 s_minor_rev_level; /* minor revision level */ 1324 /*40*/ __le32 s_lastcheck; /* time of last check */ 1325 __le32 s_checkinterval; /* max. time between checks */ 1326 __le32 s_creator_os; /* OS */ 1327 __le32 s_rev_level; /* Revision level */ 1328 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1329 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1330 /* 1331 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1332 * 1333 * Note: the difference between the compatible feature set and 1334 * the incompatible feature set is that if there is a bit set 1335 * in the incompatible feature set that the kernel doesn't 1336 * know about, it should refuse to mount the filesystem. 1337 * 1338 * e2fsck's requirements are more strict; if it doesn't know 1339 * about a feature in either the compatible or incompatible 1340 * feature set, it must abort and not try to meddle with 1341 * things it doesn't understand... 1342 */ 1343 __le32 s_first_ino; /* First non-reserved inode */ 1344 __le16 s_inode_size; /* size of inode structure */ 1345 __le16 s_block_group_nr; /* block group # of this superblock */ 1346 __le32 s_feature_compat; /* compatible feature set */ 1347 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1348 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1349 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1350 /*78*/ char s_volume_name[EXT4_LABEL_MAX]; /* volume name */ 1351 /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */ 1352 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1353 /* 1354 * Performance hints. Directory preallocation should only 1355 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1356 */ 1357 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1358 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1359 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1360 /* 1361 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1362 */ 1363 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1364 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1365 __le32 s_journal_dev; /* device number of journal file */ 1366 __le32 s_last_orphan; /* start of list of inodes to delete */ 1367 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1368 __u8 s_def_hash_version; /* Default hash version to use */ 1369 __u8 s_jnl_backup_type; 1370 __le16 s_desc_size; /* size of group descriptor */ 1371 /*100*/ __le32 s_default_mount_opts; 1372 __le32 s_first_meta_bg; /* First metablock block group */ 1373 __le32 s_mkfs_time; /* When the filesystem was created */ 1374 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1375 /* 64bit support valid if EXT4_FEATURE_INCOMPAT_64BIT */ 1376 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1377 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1378 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1379 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1380 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1381 __le32 s_flags; /* Miscellaneous flags */ 1382 __le16 s_raid_stride; /* RAID stride */ 1383 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1384 __le64 s_mmp_block; /* Block for multi-mount protection */ 1385 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1386 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1387 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1388 __u8 s_encryption_level; /* versioning level for encryption */ 1389 __u8 s_reserved_pad; /* Padding to next 32bits */ 1390 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1391 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1392 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1393 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1394 snapshot's future use */ 1395 __le32 s_snapshot_list; /* inode number of the head of the 1396 on-disk snapshot list */ 1397 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1398 __le32 s_error_count; /* number of fs errors */ 1399 __le32 s_first_error_time; /* first time an error happened */ 1400 __le32 s_first_error_ino; /* inode involved in first error */ 1401 __le64 s_first_error_block; /* block involved of first error */ 1402 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */ 1403 __le32 s_first_error_line; /* line number where error happened */ 1404 __le32 s_last_error_time; /* most recent time of an error */ 1405 __le32 s_last_error_ino; /* inode involved in last error */ 1406 __le32 s_last_error_line; /* line number where error happened */ 1407 __le64 s_last_error_block; /* block involved of last error */ 1408 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */ 1409 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1410 __u8 s_mount_opts[64]; 1411 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1412 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1413 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1414 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1415 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1416 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1417 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1418 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1419 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1420 __u8 s_wtime_hi; 1421 __u8 s_mtime_hi; 1422 __u8 s_mkfs_time_hi; 1423 __u8 s_lastcheck_hi; 1424 __u8 s_first_error_time_hi; 1425 __u8 s_last_error_time_hi; 1426 __u8 s_first_error_errcode; 1427 __u8 s_last_error_errcode; 1428 __le16 s_encoding; /* Filename charset encoding */ 1429 __le16 s_encoding_flags; /* Filename charset encoding flags */ 1430 __le32 s_orphan_file_inum; /* Inode for tracking orphan inodes */ 1431 __le32 s_reserved[94]; /* Padding to the end of the block */ 1432 __le32 s_checksum; /* crc32c(superblock) */ 1433 }; 1434 1435 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1436 1437 #ifdef __KERNEL__ 1438 1439 /* Number of quota types we support */ 1440 #define EXT4_MAXQUOTAS 3 1441 1442 #define EXT4_ENC_UTF8_12_1 1 1443 1444 /* Types of ext4 journal triggers */ 1445 enum ext4_journal_trigger_type { 1446 EXT4_JTR_ORPHAN_FILE, 1447 EXT4_JTR_NONE /* This must be the last entry for indexing to work! */ 1448 }; 1449 1450 #define EXT4_JOURNAL_TRIGGER_COUNT EXT4_JTR_NONE 1451 1452 struct ext4_journal_trigger { 1453 struct jbd2_buffer_trigger_type tr_triggers; 1454 struct super_block *sb; 1455 }; 1456 1457 static inline struct ext4_journal_trigger *EXT4_TRIGGER( 1458 struct jbd2_buffer_trigger_type *trigger) 1459 { 1460 return container_of(trigger, struct ext4_journal_trigger, tr_triggers); 1461 } 1462 1463 #define EXT4_ORPHAN_BLOCK_MAGIC 0x0b10ca04 1464 1465 /* Structure at the tail of orphan block */ 1466 struct ext4_orphan_block_tail { 1467 __le32 ob_magic; 1468 __le32 ob_checksum; 1469 }; 1470 1471 static inline int ext4_inodes_per_orphan_block(struct super_block *sb) 1472 { 1473 return (sb->s_blocksize - sizeof(struct ext4_orphan_block_tail)) / 1474 sizeof(u32); 1475 } 1476 1477 struct ext4_orphan_block { 1478 atomic_t ob_free_entries; /* Number of free orphan entries in block */ 1479 struct buffer_head *ob_bh; /* Buffer for orphan block */ 1480 }; 1481 1482 /* 1483 * Info about orphan file. 1484 */ 1485 struct ext4_orphan_info { 1486 int of_blocks; /* Number of orphan blocks in a file */ 1487 __u32 of_csum_seed; /* Checksum seed for orphan file */ 1488 struct ext4_orphan_block *of_binfo; /* Array with info about orphan 1489 * file blocks */ 1490 }; 1491 1492 /* 1493 * fourth extended-fs super-block data in memory 1494 */ 1495 struct ext4_sb_info { 1496 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1497 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1498 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1499 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1500 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1501 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1502 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1503 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1504 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1505 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1506 unsigned long s_overhead; /* # of fs overhead clusters */ 1507 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1508 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1509 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1510 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1511 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1512 /* Array of bh's for the block group descriptors */ 1513 struct buffer_head * __rcu *s_group_desc; 1514 unsigned int s_mount_opt; 1515 unsigned int s_mount_opt2; 1516 unsigned long s_mount_flags; 1517 unsigned int s_def_mount_opt; 1518 unsigned int s_def_mount_opt2; 1519 ext4_fsblk_t s_sb_block; 1520 atomic64_t s_resv_clusters; 1521 kuid_t s_resuid; 1522 kgid_t s_resgid; 1523 unsigned short s_mount_state; 1524 unsigned short s_pad; 1525 int s_addr_per_block_bits; 1526 int s_desc_per_block_bits; 1527 int s_inode_size; 1528 int s_first_ino; 1529 unsigned int s_inode_readahead_blks; 1530 unsigned int s_inode_goal; 1531 u32 s_hash_seed[4]; 1532 int s_def_hash_version; 1533 int s_hash_unsigned; /* 3 if hash should be unsigned, 0 if not */ 1534 struct percpu_counter s_freeclusters_counter; 1535 struct percpu_counter s_freeinodes_counter; 1536 struct percpu_counter s_dirs_counter; 1537 struct percpu_counter s_dirtyclusters_counter; 1538 struct percpu_counter s_sra_exceeded_retry_limit; 1539 struct blockgroup_lock *s_blockgroup_lock; 1540 struct proc_dir_entry *s_proc; 1541 struct kobject s_kobj; 1542 struct completion s_kobj_unregister; 1543 struct super_block *s_sb; 1544 struct buffer_head *s_mmp_bh; 1545 1546 /* Journaling */ 1547 struct journal_s *s_journal; 1548 unsigned long s_ext4_flags; /* Ext4 superblock flags */ 1549 struct mutex s_orphan_lock; /* Protects on disk list changes */ 1550 struct list_head s_orphan; /* List of orphaned inodes in on disk 1551 list */ 1552 struct ext4_orphan_info s_orphan_info; 1553 unsigned long s_commit_interval; 1554 u32 s_max_batch_time; 1555 u32 s_min_batch_time; 1556 struct file *s_journal_bdev_file; 1557 #ifdef CONFIG_QUOTA 1558 /* Names of quota files with journalled quota */ 1559 char __rcu *s_qf_names[EXT4_MAXQUOTAS]; 1560 int s_jquota_fmt; /* Format of quota to use */ 1561 #endif 1562 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1563 struct ext4_system_blocks __rcu *s_system_blks; 1564 1565 #ifdef EXTENTS_STATS 1566 /* ext4 extents stats */ 1567 unsigned long s_ext_min; 1568 unsigned long s_ext_max; 1569 unsigned long s_depth_max; 1570 spinlock_t s_ext_stats_lock; 1571 unsigned long s_ext_blocks; 1572 unsigned long s_ext_extents; 1573 #endif 1574 1575 /* for buddy allocator */ 1576 struct ext4_group_info ** __rcu *s_group_info; 1577 struct inode *s_buddy_cache; 1578 spinlock_t s_md_lock; 1579 unsigned short *s_mb_offsets; 1580 unsigned int *s_mb_maxs; 1581 unsigned int s_group_info_size; 1582 unsigned int s_mb_free_pending; 1583 struct list_head s_freed_data_list[2]; /* List of blocks to be freed 1584 after commit completed */ 1585 struct list_head s_discard_list; 1586 struct work_struct s_discard_work; 1587 atomic_t s_retry_alloc_pending; 1588 struct list_head *s_mb_avg_fragment_size; 1589 rwlock_t *s_mb_avg_fragment_size_locks; 1590 struct list_head *s_mb_largest_free_orders; 1591 rwlock_t *s_mb_largest_free_orders_locks; 1592 1593 /* tunables */ 1594 unsigned long s_stripe; 1595 unsigned int s_mb_max_linear_groups; 1596 unsigned int s_mb_stream_request; 1597 unsigned int s_mb_max_to_scan; 1598 unsigned int s_mb_min_to_scan; 1599 unsigned int s_mb_stats; 1600 unsigned int s_mb_order2_reqs; 1601 unsigned int s_mb_group_prealloc; 1602 unsigned int s_max_dir_size_kb; 1603 /* where last allocation was done - for stream allocation */ 1604 unsigned long s_mb_last_group; 1605 unsigned long s_mb_last_start; 1606 unsigned int s_mb_prefetch; 1607 unsigned int s_mb_prefetch_limit; 1608 unsigned int s_mb_best_avail_max_trim_order; 1609 1610 /* stats for buddy allocator */ 1611 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1612 atomic_t s_bal_success; /* we found long enough chunks */ 1613 atomic_t s_bal_allocated; /* in blocks */ 1614 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1615 atomic_t s_bal_cX_ex_scanned[EXT4_MB_NUM_CRS]; /* total extents scanned */ 1616 atomic_t s_bal_groups_scanned; /* number of groups scanned */ 1617 atomic_t s_bal_goals; /* goal hits */ 1618 atomic_t s_bal_len_goals; /* len goal hits */ 1619 atomic_t s_bal_breaks; /* too long searches */ 1620 atomic_t s_bal_2orders; /* 2^order hits */ 1621 atomic_t s_bal_p2_aligned_bad_suggestions; 1622 atomic_t s_bal_goal_fast_bad_suggestions; 1623 atomic_t s_bal_best_avail_bad_suggestions; 1624 atomic64_t s_bal_cX_groups_considered[EXT4_MB_NUM_CRS]; 1625 atomic64_t s_bal_cX_hits[EXT4_MB_NUM_CRS]; 1626 atomic64_t s_bal_cX_failed[EXT4_MB_NUM_CRS]; /* cX loop didn't find blocks */ 1627 atomic_t s_mb_buddies_generated; /* number of buddies generated */ 1628 atomic64_t s_mb_generation_time; 1629 atomic_t s_mb_lost_chunks; 1630 atomic_t s_mb_preallocated; 1631 atomic_t s_mb_discarded; 1632 atomic_t s_lock_busy; 1633 1634 /* locality groups */ 1635 struct ext4_locality_group __percpu *s_locality_groups; 1636 1637 /* for write statistics */ 1638 unsigned long s_sectors_written_start; 1639 u64 s_kbytes_written; 1640 1641 /* the size of zero-out chunk */ 1642 unsigned int s_extent_max_zeroout_kb; 1643 1644 unsigned int s_log_groups_per_flex; 1645 struct flex_groups * __rcu *s_flex_groups; 1646 ext4_group_t s_flex_groups_allocated; 1647 1648 /* workqueue for reserved extent conversions (buffered io) */ 1649 struct workqueue_struct *rsv_conversion_wq; 1650 1651 /* timer for periodic error stats printing */ 1652 struct timer_list s_err_report; 1653 1654 /* Lazy inode table initialization info */ 1655 struct ext4_li_request *s_li_request; 1656 /* Wait multiplier for lazy initialization thread */ 1657 unsigned int s_li_wait_mult; 1658 1659 /* Kernel thread for multiple mount protection */ 1660 struct task_struct *s_mmp_tsk; 1661 1662 /* record the last minlen when FITRIM is called. */ 1663 unsigned long s_last_trim_minblks; 1664 1665 /* Reference to checksum algorithm driver via cryptoapi */ 1666 struct crypto_shash *s_chksum_driver; 1667 1668 /* Precomputed FS UUID checksum for seeding other checksums */ 1669 __u32 s_csum_seed; 1670 1671 /* Reclaim extents from extent status tree */ 1672 struct shrinker *s_es_shrinker; 1673 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1674 long s_es_nr_inode; 1675 struct ext4_es_stats s_es_stats; 1676 struct mb_cache *s_ea_block_cache; 1677 struct mb_cache *s_ea_inode_cache; 1678 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1679 1680 /* Journal triggers for checksum computation */ 1681 struct ext4_journal_trigger s_journal_triggers[EXT4_JOURNAL_TRIGGER_COUNT]; 1682 1683 /* Ratelimit ext4 messages. */ 1684 struct ratelimit_state s_err_ratelimit_state; 1685 struct ratelimit_state s_warning_ratelimit_state; 1686 struct ratelimit_state s_msg_ratelimit_state; 1687 atomic_t s_warning_count; 1688 atomic_t s_msg_count; 1689 1690 /* Encryption policy for '-o test_dummy_encryption' */ 1691 struct fscrypt_dummy_policy s_dummy_enc_policy; 1692 1693 /* 1694 * Barrier between writepages ops and changing any inode's JOURNAL_DATA 1695 * or EXTENTS flag or between writepages ops and changing DELALLOC or 1696 * DIOREAD_NOLOCK mount options on remount. 1697 */ 1698 struct percpu_rw_semaphore s_writepages_rwsem; 1699 struct dax_device *s_daxdev; 1700 u64 s_dax_part_off; 1701 #ifdef CONFIG_EXT4_DEBUG 1702 unsigned long s_simulate_fail; 1703 #endif 1704 /* Record the errseq of the backing block device */ 1705 errseq_t s_bdev_wb_err; 1706 spinlock_t s_bdev_wb_lock; 1707 1708 /* Information about errors that happened during this mount */ 1709 spinlock_t s_error_lock; 1710 int s_add_error_count; 1711 int s_first_error_code; 1712 __u32 s_first_error_line; 1713 __u32 s_first_error_ino; 1714 __u64 s_first_error_block; 1715 const char *s_first_error_func; 1716 time64_t s_first_error_time; 1717 int s_last_error_code; 1718 __u32 s_last_error_line; 1719 __u32 s_last_error_ino; 1720 __u64 s_last_error_block; 1721 const char *s_last_error_func; 1722 time64_t s_last_error_time; 1723 /* 1724 * If we are in a context where we cannot update the on-disk 1725 * superblock, we queue the work here. This is used to update 1726 * the error information in the superblock, and for periodic 1727 * updates of the superblock called from the commit callback 1728 * function. 1729 */ 1730 struct work_struct s_sb_upd_work; 1731 1732 /* Ext4 fast commit sub transaction ID */ 1733 atomic_t s_fc_subtid; 1734 1735 /* 1736 * After commit starts, the main queue gets locked, and the further 1737 * updates get added in the staging queue. 1738 */ 1739 #define FC_Q_MAIN 0 1740 #define FC_Q_STAGING 1 1741 struct list_head s_fc_q[2]; /* Inodes staged for fast commit 1742 * that have data changes in them. 1743 */ 1744 struct list_head s_fc_dentry_q[2]; /* directory entry updates */ 1745 unsigned int s_fc_bytes; 1746 /* 1747 * Main fast commit lock. This lock protects accesses to the 1748 * following fields: 1749 * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh. 1750 */ 1751 spinlock_t s_fc_lock; 1752 struct buffer_head *s_fc_bh; 1753 struct ext4_fc_stats s_fc_stats; 1754 tid_t s_fc_ineligible_tid; 1755 #ifdef CONFIG_EXT4_DEBUG 1756 int s_fc_debug_max_replay; 1757 #endif 1758 struct ext4_fc_replay_state s_fc_replay_state; 1759 }; 1760 1761 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1762 { 1763 return sb->s_fs_info; 1764 } 1765 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1766 { 1767 return container_of(inode, struct ext4_inode_info, vfs_inode); 1768 } 1769 1770 static inline int ext4_writepages_down_read(struct super_block *sb) 1771 { 1772 percpu_down_read(&EXT4_SB(sb)->s_writepages_rwsem); 1773 return memalloc_nofs_save(); 1774 } 1775 1776 static inline void ext4_writepages_up_read(struct super_block *sb, int ctx) 1777 { 1778 memalloc_nofs_restore(ctx); 1779 percpu_up_read(&EXT4_SB(sb)->s_writepages_rwsem); 1780 } 1781 1782 static inline int ext4_writepages_down_write(struct super_block *sb) 1783 { 1784 percpu_down_write(&EXT4_SB(sb)->s_writepages_rwsem); 1785 return memalloc_nofs_save(); 1786 } 1787 1788 static inline void ext4_writepages_up_write(struct super_block *sb, int ctx) 1789 { 1790 memalloc_nofs_restore(ctx); 1791 percpu_up_write(&EXT4_SB(sb)->s_writepages_rwsem); 1792 } 1793 1794 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1795 { 1796 return ino == EXT4_ROOT_INO || 1797 (ino >= EXT4_FIRST_INO(sb) && 1798 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1799 } 1800 1801 /* 1802 * Returns: sbi->field[index] 1803 * Used to access an array element from the following sbi fields which require 1804 * rcu protection to avoid dereferencing an invalid pointer due to reassignment 1805 * - s_group_desc 1806 * - s_group_info 1807 * - s_flex_group 1808 */ 1809 #define sbi_array_rcu_deref(sbi, field, index) \ 1810 ({ \ 1811 typeof(*((sbi)->field)) _v; \ 1812 rcu_read_lock(); \ 1813 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \ 1814 rcu_read_unlock(); \ 1815 _v; \ 1816 }) 1817 1818 /* 1819 * run-time mount flags 1820 */ 1821 enum { 1822 EXT4_MF_MNTDIR_SAMPLED, 1823 EXT4_MF_FC_INELIGIBLE /* Fast commit ineligible */ 1824 }; 1825 1826 static inline void ext4_set_mount_flag(struct super_block *sb, int bit) 1827 { 1828 set_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1829 } 1830 1831 static inline void ext4_clear_mount_flag(struct super_block *sb, int bit) 1832 { 1833 clear_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1834 } 1835 1836 static inline int ext4_test_mount_flag(struct super_block *sb, int bit) 1837 { 1838 return test_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1839 } 1840 1841 1842 /* 1843 * Simulate_fail codes 1844 */ 1845 #define EXT4_SIM_BBITMAP_EIO 1 1846 #define EXT4_SIM_BBITMAP_CRC 2 1847 #define EXT4_SIM_IBITMAP_EIO 3 1848 #define EXT4_SIM_IBITMAP_CRC 4 1849 #define EXT4_SIM_INODE_EIO 5 1850 #define EXT4_SIM_INODE_CRC 6 1851 #define EXT4_SIM_DIRBLOCK_EIO 7 1852 #define EXT4_SIM_DIRBLOCK_CRC 8 1853 1854 static inline bool ext4_simulate_fail(struct super_block *sb, 1855 unsigned long code) 1856 { 1857 #ifdef CONFIG_EXT4_DEBUG 1858 struct ext4_sb_info *sbi = EXT4_SB(sb); 1859 1860 if (unlikely(sbi->s_simulate_fail == code)) { 1861 sbi->s_simulate_fail = 0; 1862 return true; 1863 } 1864 #endif 1865 return false; 1866 } 1867 1868 static inline void ext4_simulate_fail_bh(struct super_block *sb, 1869 struct buffer_head *bh, 1870 unsigned long code) 1871 { 1872 if (!IS_ERR(bh) && ext4_simulate_fail(sb, code)) 1873 clear_buffer_uptodate(bh); 1874 } 1875 1876 /* 1877 * Error number codes for s_{first,last}_error_errno 1878 * 1879 * Linux errno numbers are architecture specific, so we need to translate 1880 * them into something which is architecture independent. We don't define 1881 * codes for all errno's; just the ones which are most likely to be the cause 1882 * of an ext4_error() call. 1883 */ 1884 #define EXT4_ERR_UNKNOWN 1 1885 #define EXT4_ERR_EIO 2 1886 #define EXT4_ERR_ENOMEM 3 1887 #define EXT4_ERR_EFSBADCRC 4 1888 #define EXT4_ERR_EFSCORRUPTED 5 1889 #define EXT4_ERR_ENOSPC 6 1890 #define EXT4_ERR_ENOKEY 7 1891 #define EXT4_ERR_EROFS 8 1892 #define EXT4_ERR_EFBIG 9 1893 #define EXT4_ERR_EEXIST 10 1894 #define EXT4_ERR_ERANGE 11 1895 #define EXT4_ERR_EOVERFLOW 12 1896 #define EXT4_ERR_EBUSY 13 1897 #define EXT4_ERR_ENOTDIR 14 1898 #define EXT4_ERR_ENOTEMPTY 15 1899 #define EXT4_ERR_ESHUTDOWN 16 1900 #define EXT4_ERR_EFAULT 17 1901 1902 /* 1903 * Inode dynamic state flags 1904 */ 1905 enum { 1906 EXT4_STATE_NEW, /* inode is newly created */ 1907 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1908 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1909 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1910 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1911 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1912 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1913 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1914 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */ 1915 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */ 1916 EXT4_STATE_FC_COMMITTING, /* Fast commit ongoing */ 1917 EXT4_STATE_ORPHAN_FILE, /* Inode orphaned in orphan file */ 1918 }; 1919 1920 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1921 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1922 { \ 1923 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1924 } \ 1925 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1926 { \ 1927 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1928 } \ 1929 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1930 { \ 1931 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1932 } 1933 1934 /* Add these declarations here only so that these functions can be 1935 * found by name. Otherwise, they are very hard to locate. */ 1936 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1937 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1938 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1939 EXT4_INODE_BIT_FNS(flag, flags, 0) 1940 1941 /* Add these declarations here only so that these functions can be 1942 * found by name. Otherwise, they are very hard to locate. */ 1943 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1944 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1945 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1946 #if (BITS_PER_LONG < 64) 1947 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1948 1949 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1950 { 1951 (ei)->i_state_flags = 0; 1952 } 1953 #else 1954 EXT4_INODE_BIT_FNS(state, flags, 32) 1955 1956 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1957 { 1958 /* We depend on the fact that callers will set i_flags */ 1959 } 1960 #endif 1961 #else 1962 /* Assume that user mode programs are passing in an ext4fs superblock, not 1963 * a kernel struct super_block. This will allow us to call the feature-test 1964 * macros from user land. */ 1965 #define EXT4_SB(sb) (sb) 1966 #endif 1967 1968 static inline bool ext4_verity_in_progress(struct inode *inode) 1969 { 1970 return IS_ENABLED(CONFIG_FS_VERITY) && 1971 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS); 1972 } 1973 1974 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1975 1976 /* 1977 * Codes for operating systems 1978 */ 1979 #define EXT4_OS_LINUX 0 1980 #define EXT4_OS_HURD 1 1981 #define EXT4_OS_MASIX 2 1982 #define EXT4_OS_FREEBSD 3 1983 #define EXT4_OS_LITES 4 1984 1985 /* 1986 * Revision levels 1987 */ 1988 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1989 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1990 1991 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1992 1993 #define EXT4_GOOD_OLD_INODE_SIZE 128 1994 1995 #define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN) 1996 #define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX 1997 #define EXT4_TIMESTAMP_MIN S32_MIN 1998 1999 /* 2000 * Feature set definitions 2001 */ 2002 2003 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 2004 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 2005 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 2006 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 2007 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 2008 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 2009 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 2010 /* 2011 * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes 2012 * incompatible only if fast commit blocks are present in the FS. Since we 2013 * clear the journal (and thus the fast commit blocks), we don't mark FS as 2014 * incompatible. We also have a JBD2 incompat feature, which gets set when 2015 * there are fast commit blocks present in the journal. 2016 */ 2017 #define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400 2018 #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800 2019 #define EXT4_FEATURE_COMPAT_ORPHAN_FILE 0x1000 /* Orphan file exists */ 2020 2021 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 2022 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 2023 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 2024 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 2025 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 2026 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 2027 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 2028 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 2029 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 2030 /* 2031 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 2032 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 2033 * all other data structures' checksums. However, the METADATA_CSUM and 2034 * GDT_CSUM bits are mutually exclusive. 2035 */ 2036 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 2037 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 2038 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 2039 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000 2040 #define EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT 0x10000 /* Orphan file may be 2041 non-empty */ 2042 2043 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 2044 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 2045 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 2046 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 2047 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 2048 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 2049 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 2050 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 2051 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 2052 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 2053 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 2054 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 2055 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 2056 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 2057 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 2058 #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000 2059 2060 extern void ext4_update_dynamic_rev(struct super_block *sb); 2061 2062 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 2063 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 2064 { \ 2065 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 2066 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 2067 } \ 2068 static inline void ext4_set_feature_##name(struct super_block *sb) \ 2069 { \ 2070 ext4_update_dynamic_rev(sb); \ 2071 EXT4_SB(sb)->s_es->s_feature_compat |= \ 2072 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 2073 } \ 2074 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 2075 { \ 2076 EXT4_SB(sb)->s_es->s_feature_compat &= \ 2077 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 2078 } 2079 2080 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 2081 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 2082 { \ 2083 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 2084 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 2085 } \ 2086 static inline void ext4_set_feature_##name(struct super_block *sb) \ 2087 { \ 2088 ext4_update_dynamic_rev(sb); \ 2089 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 2090 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 2091 } \ 2092 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 2093 { \ 2094 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 2095 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 2096 } 2097 2098 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 2099 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 2100 { \ 2101 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 2102 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 2103 } \ 2104 static inline void ext4_set_feature_##name(struct super_block *sb) \ 2105 { \ 2106 ext4_update_dynamic_rev(sb); \ 2107 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 2108 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 2109 } \ 2110 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 2111 { \ 2112 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 2113 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 2114 } 2115 2116 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 2117 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 2118 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 2119 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 2120 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 2121 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 2122 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 2123 EXT4_FEATURE_COMPAT_FUNCS(fast_commit, FAST_COMMIT) 2124 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES) 2125 EXT4_FEATURE_COMPAT_FUNCS(orphan_file, ORPHAN_FILE) 2126 2127 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 2128 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 2129 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 2130 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 2131 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 2132 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 2133 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 2134 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 2135 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 2136 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 2137 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 2138 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 2139 EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY) 2140 EXT4_FEATURE_RO_COMPAT_FUNCS(orphan_present, ORPHAN_PRESENT) 2141 2142 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 2143 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 2144 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 2145 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 2146 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 2147 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 2148 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 2149 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 2150 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 2151 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 2152 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 2153 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 2154 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 2155 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 2156 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 2157 EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD) 2158 2159 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2160 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2161 EXT4_FEATURE_INCOMPAT_META_BG) 2162 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2163 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2164 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 2165 2166 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2167 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2168 EXT4_FEATURE_INCOMPAT_RECOVER| \ 2169 EXT4_FEATURE_INCOMPAT_META_BG) 2170 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2171 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2172 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 2173 2174 #define EXT4_FEATURE_COMPAT_SUPP (EXT4_FEATURE_COMPAT_EXT_ATTR| \ 2175 EXT4_FEATURE_COMPAT_ORPHAN_FILE) 2176 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2177 EXT4_FEATURE_INCOMPAT_RECOVER| \ 2178 EXT4_FEATURE_INCOMPAT_META_BG| \ 2179 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 2180 EXT4_FEATURE_INCOMPAT_64BIT| \ 2181 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 2182 EXT4_FEATURE_INCOMPAT_EA_INODE| \ 2183 EXT4_FEATURE_INCOMPAT_MMP | \ 2184 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 2185 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 2186 EXT4_FEATURE_INCOMPAT_CASEFOLD | \ 2187 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \ 2188 EXT4_FEATURE_INCOMPAT_LARGEDIR) 2189 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2190 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2191 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 2192 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 2193 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 2194 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 2195 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 2196 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 2197 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 2198 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 2199 EXT4_FEATURE_RO_COMPAT_PROJECT |\ 2200 EXT4_FEATURE_RO_COMPAT_VERITY |\ 2201 EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT) 2202 2203 #define EXTN_FEATURE_FUNCS(ver) \ 2204 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 2205 { \ 2206 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 2207 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 2208 } \ 2209 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 2210 { \ 2211 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 2212 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 2213 } \ 2214 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 2215 { \ 2216 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 2217 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 2218 } 2219 2220 EXTN_FEATURE_FUNCS(2) 2221 EXTN_FEATURE_FUNCS(3) 2222 EXTN_FEATURE_FUNCS(4) 2223 2224 static inline bool ext4_has_compat_features(struct super_block *sb) 2225 { 2226 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 2227 } 2228 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 2229 { 2230 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 2231 } 2232 static inline bool ext4_has_incompat_features(struct super_block *sb) 2233 { 2234 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 2235 } 2236 2237 extern int ext4_feature_set_ok(struct super_block *sb, int readonly); 2238 2239 /* 2240 * Superblock flags 2241 */ 2242 #define EXT4_FLAGS_RESIZING 0 2243 #define EXT4_FLAGS_SHUTDOWN 1 2244 #define EXT4_FLAGS_BDEV_IS_DAX 2 2245 2246 static inline int ext4_forced_shutdown(struct super_block *sb) 2247 { 2248 return test_bit(EXT4_FLAGS_SHUTDOWN, &EXT4_SB(sb)->s_ext4_flags); 2249 } 2250 2251 /* 2252 * Default values for user and/or group using reserved blocks 2253 */ 2254 #define EXT4_DEF_RESUID 0 2255 #define EXT4_DEF_RESGID 0 2256 2257 /* 2258 * Default project ID 2259 */ 2260 #define EXT4_DEF_PROJID 0 2261 2262 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 2263 2264 /* 2265 * Default mount options 2266 */ 2267 #define EXT4_DEFM_DEBUG 0x0001 2268 #define EXT4_DEFM_BSDGROUPS 0x0002 2269 #define EXT4_DEFM_XATTR_USER 0x0004 2270 #define EXT4_DEFM_ACL 0x0008 2271 #define EXT4_DEFM_UID16 0x0010 2272 #define EXT4_DEFM_JMODE 0x0060 2273 #define EXT4_DEFM_JMODE_DATA 0x0020 2274 #define EXT4_DEFM_JMODE_ORDERED 0x0040 2275 #define EXT4_DEFM_JMODE_WBACK 0x0060 2276 #define EXT4_DEFM_NOBARRIER 0x0100 2277 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 2278 #define EXT4_DEFM_DISCARD 0x0400 2279 #define EXT4_DEFM_NODELALLOC 0x0800 2280 2281 /* 2282 * Default journal batch times 2283 */ 2284 #define EXT4_DEF_MIN_BATCH_TIME 0 2285 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 2286 2287 /* 2288 * Minimum number of groups in a flexgroup before we separate out 2289 * directories into the first block group of a flexgroup 2290 */ 2291 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 2292 2293 /* 2294 * Structure of a directory entry 2295 */ 2296 #define EXT4_NAME_LEN 255 2297 /* 2298 * Base length of the ext4 directory entry excluding the name length 2299 */ 2300 #define EXT4_BASE_DIR_LEN (sizeof(struct ext4_dir_entry_2) - EXT4_NAME_LEN) 2301 2302 struct ext4_dir_entry { 2303 __le32 inode; /* Inode number */ 2304 __le16 rec_len; /* Directory entry length */ 2305 __le16 name_len; /* Name length */ 2306 char name[EXT4_NAME_LEN]; /* File name */ 2307 }; 2308 2309 2310 /* 2311 * Encrypted Casefolded entries require saving the hash on disk. This structure 2312 * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned 2313 * boundary. 2314 */ 2315 struct ext4_dir_entry_hash { 2316 __le32 hash; 2317 __le32 minor_hash; 2318 }; 2319 2320 /* 2321 * The new version of the directory entry. Since EXT4 structures are 2322 * stored in intel byte order, and the name_len field could never be 2323 * bigger than 255 chars, it's safe to reclaim the extra byte for the 2324 * file_type field. 2325 */ 2326 struct ext4_dir_entry_2 { 2327 __le32 inode; /* Inode number */ 2328 __le16 rec_len; /* Directory entry length */ 2329 __u8 name_len; /* Name length */ 2330 __u8 file_type; /* See file type macros EXT4_FT_* below */ 2331 char name[EXT4_NAME_LEN]; /* File name */ 2332 }; 2333 2334 /* 2335 * Access the hashes at the end of ext4_dir_entry_2 2336 */ 2337 #define EXT4_DIRENT_HASHES(entry) \ 2338 ((struct ext4_dir_entry_hash *) \ 2339 (((void *)(entry)) + \ 2340 ((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND))) 2341 #define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(de)->hash) 2342 #define EXT4_DIRENT_MINOR_HASH(entry) \ 2343 le32_to_cpu(EXT4_DIRENT_HASHES(de)->minor_hash) 2344 2345 static inline bool ext4_hash_in_dirent(const struct inode *inode) 2346 { 2347 return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode); 2348 } 2349 2350 /* 2351 * This is a bogus directory entry at the end of each leaf block that 2352 * records checksums. 2353 */ 2354 struct ext4_dir_entry_tail { 2355 __le32 det_reserved_zero1; /* Pretend to be unused */ 2356 __le16 det_rec_len; /* 12 */ 2357 __u8 det_reserved_zero2; /* Zero name length */ 2358 __u8 det_reserved_ft; /* 0xDE, fake file type */ 2359 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 2360 }; 2361 2362 #define EXT4_DIRENT_TAIL(block, blocksize) \ 2363 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 2364 ((blocksize) - \ 2365 sizeof(struct ext4_dir_entry_tail)))) 2366 2367 /* 2368 * Ext4 directory file types. Only the low 3 bits are used. The 2369 * other bits are reserved for now. 2370 */ 2371 #define EXT4_FT_UNKNOWN 0 2372 #define EXT4_FT_REG_FILE 1 2373 #define EXT4_FT_DIR 2 2374 #define EXT4_FT_CHRDEV 3 2375 #define EXT4_FT_BLKDEV 4 2376 #define EXT4_FT_FIFO 5 2377 #define EXT4_FT_SOCK 6 2378 #define EXT4_FT_SYMLINK 7 2379 2380 #define EXT4_FT_MAX 8 2381 2382 #define EXT4_FT_DIR_CSUM 0xDE 2383 2384 /* 2385 * EXT4_DIR_PAD defines the directory entries boundaries 2386 * 2387 * NOTE: It must be a multiple of 4 2388 */ 2389 #define EXT4_DIR_PAD 4 2390 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 2391 #define EXT4_MAX_REC_LEN ((1<<16)-1) 2392 2393 /* 2394 * The rec_len is dependent on the type of directory. Directories that are 2395 * casefolded and encrypted need to store the hash as well, so we add room for 2396 * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should 2397 * pass NULL for dir, as those entries do not use the extra fields. 2398 */ 2399 static inline unsigned int ext4_dir_rec_len(__u8 name_len, 2400 const struct inode *dir) 2401 { 2402 int rec_len = (name_len + 8 + EXT4_DIR_ROUND); 2403 2404 if (dir && ext4_hash_in_dirent(dir)) 2405 rec_len += sizeof(struct ext4_dir_entry_hash); 2406 return (rec_len & ~EXT4_DIR_ROUND); 2407 } 2408 2409 /* 2410 * If we ever get support for fs block sizes > page_size, we'll need 2411 * to remove the #if statements in the next two functions... 2412 */ 2413 static inline unsigned int 2414 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 2415 { 2416 unsigned len = le16_to_cpu(dlen); 2417 2418 #if (PAGE_SIZE >= 65536) 2419 if (len == EXT4_MAX_REC_LEN || len == 0) 2420 return blocksize; 2421 return (len & 65532) | ((len & 3) << 16); 2422 #else 2423 return len; 2424 #endif 2425 } 2426 2427 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 2428 { 2429 BUG_ON((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)); 2430 #if (PAGE_SIZE >= 65536) 2431 if (len < 65536) 2432 return cpu_to_le16(len); 2433 if (len == blocksize) { 2434 if (blocksize == 65536) 2435 return cpu_to_le16(EXT4_MAX_REC_LEN); 2436 else 2437 return cpu_to_le16(0); 2438 } 2439 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 2440 #else 2441 return cpu_to_le16(len); 2442 #endif 2443 } 2444 2445 /* 2446 * Hash Tree Directory indexing 2447 * (c) Daniel Phillips, 2001 2448 */ 2449 2450 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2451 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2452 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \ 2453 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir))) 2454 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2455 2456 /* Legal values for the dx_root hash_version field: */ 2457 2458 #define DX_HASH_LEGACY 0 2459 #define DX_HASH_HALF_MD4 1 2460 #define DX_HASH_TEA 2 2461 #define DX_HASH_LEGACY_UNSIGNED 3 2462 #define DX_HASH_HALF_MD4_UNSIGNED 4 2463 #define DX_HASH_TEA_UNSIGNED 5 2464 #define DX_HASH_SIPHASH 6 2465 2466 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 2467 const void *address, unsigned int length) 2468 { 2469 struct { 2470 struct shash_desc shash; 2471 char ctx[4]; 2472 } desc; 2473 2474 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2475 2476 desc.shash.tfm = sbi->s_chksum_driver; 2477 *(u32 *)desc.ctx = crc; 2478 2479 BUG_ON(crypto_shash_update(&desc.shash, address, length)); 2480 2481 return *(u32 *)desc.ctx; 2482 } 2483 2484 #ifdef __KERNEL__ 2485 2486 /* hash info structure used by the directory hash */ 2487 struct dx_hash_info 2488 { 2489 u32 hash; 2490 u32 minor_hash; 2491 int hash_version; 2492 u32 *seed; 2493 }; 2494 2495 2496 /* 32 and 64 bit signed EOF for dx directories */ 2497 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2498 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2499 2500 2501 /* 2502 * Control parameters used by ext4_htree_next_block 2503 */ 2504 #define HASH_NB_ALWAYS 1 2505 2506 struct ext4_filename { 2507 const struct qstr *usr_fname; 2508 struct fscrypt_str disk_name; 2509 struct dx_hash_info hinfo; 2510 #ifdef CONFIG_FS_ENCRYPTION 2511 struct fscrypt_str crypto_buf; 2512 #endif 2513 #if IS_ENABLED(CONFIG_UNICODE) 2514 struct fscrypt_str cf_name; 2515 #endif 2516 }; 2517 2518 #define fname_name(p) ((p)->disk_name.name) 2519 #define fname_usr_name(p) ((p)->usr_fname->name) 2520 #define fname_len(p) ((p)->disk_name.len) 2521 2522 /* 2523 * Describe an inode's exact location on disk and in memory 2524 */ 2525 struct ext4_iloc 2526 { 2527 struct buffer_head *bh; 2528 unsigned long offset; 2529 ext4_group_t block_group; 2530 }; 2531 2532 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2533 { 2534 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2535 } 2536 2537 static inline bool ext4_is_quota_file(struct inode *inode) 2538 { 2539 return IS_NOQUOTA(inode) && 2540 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL); 2541 } 2542 2543 /* 2544 * This structure is stuffed into the struct file's private_data field 2545 * for directories. It is where we put information so that we can do 2546 * readdir operations in hash tree order. 2547 */ 2548 struct dir_private_info { 2549 struct rb_root root; 2550 struct rb_node *curr_node; 2551 struct fname *extra_fname; 2552 loff_t last_pos; 2553 __u32 curr_hash; 2554 __u32 curr_minor_hash; 2555 __u32 next_hash; 2556 }; 2557 2558 /* calculate the first block number of the group */ 2559 static inline ext4_fsblk_t 2560 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2561 { 2562 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2563 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2564 } 2565 2566 /* 2567 * Special error return code only used by dx_probe() and its callers. 2568 */ 2569 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2570 2571 /* htree levels for ext4 */ 2572 #define EXT4_HTREE_LEVEL_COMPAT 2 2573 #define EXT4_HTREE_LEVEL 3 2574 2575 static inline int ext4_dir_htree_level(struct super_block *sb) 2576 { 2577 return ext4_has_feature_largedir(sb) ? 2578 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT; 2579 } 2580 2581 /* 2582 * Timeout and state flag for lazy initialization inode thread. 2583 */ 2584 #define EXT4_DEF_LI_WAIT_MULT 10 2585 #define EXT4_DEF_LI_MAX_START_DELAY 5 2586 #define EXT4_LAZYINIT_QUIT 0x0001 2587 #define EXT4_LAZYINIT_RUNNING 0x0002 2588 2589 /* 2590 * Lazy inode table initialization info 2591 */ 2592 struct ext4_lazy_init { 2593 unsigned long li_state; 2594 struct list_head li_request_list; 2595 struct mutex li_list_mtx; 2596 }; 2597 2598 enum ext4_li_mode { 2599 EXT4_LI_MODE_PREFETCH_BBITMAP, 2600 EXT4_LI_MODE_ITABLE, 2601 }; 2602 2603 struct ext4_li_request { 2604 struct super_block *lr_super; 2605 enum ext4_li_mode lr_mode; 2606 ext4_group_t lr_first_not_zeroed; 2607 ext4_group_t lr_next_group; 2608 struct list_head lr_request; 2609 unsigned long lr_next_sched; 2610 unsigned long lr_timeout; 2611 }; 2612 2613 struct ext4_features { 2614 struct kobject f_kobj; 2615 struct completion f_kobj_unregister; 2616 }; 2617 2618 /* 2619 * This structure will be used for multiple mount protection. It will be 2620 * written into the block number saved in the s_mmp_block field in the 2621 * superblock. Programs that check MMP should assume that if 2622 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2623 * to use the filesystem, regardless of how old the timestamp is. 2624 */ 2625 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2626 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2627 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2628 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2629 2630 struct mmp_struct { 2631 __le32 mmp_magic; /* Magic number for MMP */ 2632 __le32 mmp_seq; /* Sequence no. updated periodically */ 2633 2634 /* 2635 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2636 * purposes and do not affect the correctness of the algorithm 2637 */ 2638 __le64 mmp_time; /* Time last updated */ 2639 char mmp_nodename[64]; /* Node which last updated MMP block */ 2640 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2641 2642 /* 2643 * mmp_check_interval is used to verify if the MMP block has been 2644 * updated on the block device. The value is updated based on the 2645 * maximum time to write the MMP block during an update cycle. 2646 */ 2647 __le16 mmp_check_interval; 2648 2649 __le16 mmp_pad1; 2650 __le32 mmp_pad2[226]; 2651 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2652 }; 2653 2654 /* arguments passed to the mmp thread */ 2655 struct mmpd_data { 2656 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2657 struct super_block *sb; /* super block of the fs */ 2658 }; 2659 2660 /* 2661 * Check interval multiplier 2662 * The MMP block is written every update interval and initially checked every 2663 * update interval x the multiplier (the value is then adapted based on the 2664 * write latency). The reason is that writes can be delayed under load and we 2665 * don't want readers to incorrectly assume that the filesystem is no longer 2666 * in use. 2667 */ 2668 #define EXT4_MMP_CHECK_MULT 2UL 2669 2670 /* 2671 * Minimum interval for MMP checking in seconds. 2672 */ 2673 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2674 2675 /* 2676 * Maximum interval for MMP checking in seconds. 2677 */ 2678 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2679 2680 /* 2681 * Function prototypes 2682 */ 2683 2684 /* 2685 * Ok, these declarations are also in <linux/kernel.h> but none of the 2686 * ext4 source programs needs to include it so they are duplicated here. 2687 */ 2688 # define NORET_TYPE /**/ 2689 # define ATTRIB_NORET __attribute__((noreturn)) 2690 # define NORET_AND noreturn, 2691 2692 /* bitmap.c */ 2693 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2694 void ext4_inode_bitmap_csum_set(struct super_block *sb, 2695 struct ext4_group_desc *gdp, 2696 struct buffer_head *bh, int sz); 2697 int ext4_inode_bitmap_csum_verify(struct super_block *sb, 2698 struct ext4_group_desc *gdp, 2699 struct buffer_head *bh, int sz); 2700 void ext4_block_bitmap_csum_set(struct super_block *sb, 2701 struct ext4_group_desc *gdp, 2702 struct buffer_head *bh); 2703 int ext4_block_bitmap_csum_verify(struct super_block *sb, 2704 struct ext4_group_desc *gdp, 2705 struct buffer_head *bh); 2706 2707 /* balloc.c */ 2708 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2709 ext4_fsblk_t blocknr, 2710 ext4_group_t *blockgrpp, 2711 ext4_grpblk_t *offsetp); 2712 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2713 ext4_fsblk_t block); 2714 2715 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2716 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2717 ext4_group_t group); 2718 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2719 ext4_fsblk_t goal, 2720 unsigned int flags, 2721 unsigned long *count, 2722 int *errp); 2723 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2724 s64 nclusters, unsigned int flags); 2725 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2726 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2727 ext4_group_t block_group, 2728 struct buffer_head ** bh); 2729 extern struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2730 ext4_group_t group); 2731 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2732 2733 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2734 ext4_group_t block_group, 2735 bool ignore_locked); 2736 extern int ext4_wait_block_bitmap(struct super_block *sb, 2737 ext4_group_t block_group, 2738 struct buffer_head *bh); 2739 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2740 ext4_group_t block_group); 2741 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2742 ext4_group_t block_group, 2743 struct ext4_group_desc *gdp); 2744 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2745 2746 #if IS_ENABLED(CONFIG_UNICODE) 2747 extern int ext4_fname_setup_ci_filename(struct inode *dir, 2748 const struct qstr *iname, 2749 struct ext4_filename *fname); 2750 #endif 2751 2752 /* ext4 encryption related stuff goes here crypto.c */ 2753 #ifdef CONFIG_FS_ENCRYPTION 2754 extern const struct fscrypt_operations ext4_cryptops; 2755 2756 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname, 2757 int lookup, struct ext4_filename *fname); 2758 2759 int ext4_fname_prepare_lookup(struct inode *dir, struct dentry *dentry, 2760 struct ext4_filename *fname); 2761 2762 void ext4_fname_free_filename(struct ext4_filename *fname); 2763 2764 int ext4_ioctl_get_encryption_pwsalt(struct file *filp, void __user *arg); 2765 2766 #else /* !CONFIG_FS_ENCRYPTION */ 2767 static inline int ext4_fname_setup_filename(struct inode *dir, 2768 const struct qstr *iname, 2769 int lookup, 2770 struct ext4_filename *fname) 2771 { 2772 int err = 0; 2773 fname->usr_fname = iname; 2774 fname->disk_name.name = (unsigned char *) iname->name; 2775 fname->disk_name.len = iname->len; 2776 2777 #if IS_ENABLED(CONFIG_UNICODE) 2778 err = ext4_fname_setup_ci_filename(dir, iname, fname); 2779 #endif 2780 2781 return err; 2782 } 2783 2784 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2785 struct dentry *dentry, 2786 struct ext4_filename *fname) 2787 { 2788 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname); 2789 } 2790 2791 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2792 { 2793 #if IS_ENABLED(CONFIG_UNICODE) 2794 kfree(fname->cf_name.name); 2795 fname->cf_name.name = NULL; 2796 #endif 2797 } 2798 2799 static inline int ext4_ioctl_get_encryption_pwsalt(struct file *filp, 2800 void __user *arg) 2801 { 2802 return -EOPNOTSUPP; 2803 } 2804 #endif /* !CONFIG_FS_ENCRYPTION */ 2805 2806 /* dir.c */ 2807 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2808 struct file *, 2809 struct ext4_dir_entry_2 *, 2810 struct buffer_head *, char *, int, 2811 unsigned int); 2812 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2813 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2814 (de), (bh), (buf), (size), (offset))) 2815 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2816 __u32 minor_hash, 2817 struct ext4_dir_entry_2 *dirent, 2818 struct fscrypt_str *ent_name); 2819 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2820 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2821 struct buffer_head *bh, 2822 void *buf, int buf_size, 2823 struct ext4_filename *fname, 2824 struct ext4_dir_entry_2 **dest_de); 2825 void ext4_insert_dentry(struct inode *dir, struct inode *inode, 2826 struct ext4_dir_entry_2 *de, 2827 int buf_size, 2828 struct ext4_filename *fname); 2829 static inline void ext4_update_dx_flag(struct inode *inode) 2830 { 2831 if (!ext4_has_feature_dir_index(inode->i_sb) && 2832 ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) { 2833 /* ext4_iget() should have caught this... */ 2834 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb)); 2835 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2836 } 2837 } 2838 static const unsigned char ext4_filetype_table[] = { 2839 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2840 }; 2841 2842 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2843 { 2844 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2845 return DT_UNKNOWN; 2846 2847 return ext4_filetype_table[filetype]; 2848 } 2849 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2850 void *buf, int buf_size); 2851 2852 /* fsync.c */ 2853 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2854 2855 /* hash.c */ 2856 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len, 2857 struct dx_hash_info *hinfo); 2858 2859 /* ialloc.c */ 2860 extern int ext4_mark_inode_used(struct super_block *sb, int ino); 2861 extern struct inode *__ext4_new_inode(struct mnt_idmap *, handle_t *, 2862 struct inode *, umode_t, 2863 const struct qstr *qstr, __u32 goal, 2864 uid_t *owner, __u32 i_flags, 2865 int handle_type, unsigned int line_no, 2866 int nblocks); 2867 2868 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \ 2869 __ext4_new_inode(&nop_mnt_idmap, (handle), (dir), (mode), (qstr), \ 2870 (goal), (owner), i_flags, 0, 0, 0) 2871 #define ext4_new_inode_start_handle(idmap, dir, mode, qstr, goal, owner, \ 2872 type, nblocks) \ 2873 __ext4_new_inode((idmap), NULL, (dir), (mode), (qstr), (goal), (owner), \ 2874 0, (type), __LINE__, (nblocks)) 2875 2876 2877 extern void ext4_free_inode(handle_t *, struct inode *); 2878 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2879 extern unsigned long ext4_count_free_inodes(struct super_block *); 2880 extern unsigned long ext4_count_dirs(struct super_block *); 2881 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2882 extern int ext4_init_inode_table(struct super_block *sb, 2883 ext4_group_t group, int barrier); 2884 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2885 2886 /* fast_commit.c */ 2887 int ext4_fc_info_show(struct seq_file *seq, void *v); 2888 void ext4_fc_init(struct super_block *sb, journal_t *journal); 2889 void ext4_fc_init_inode(struct inode *inode); 2890 void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start, 2891 ext4_lblk_t end); 2892 void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode, 2893 struct dentry *dentry); 2894 void __ext4_fc_track_link(handle_t *handle, struct inode *inode, 2895 struct dentry *dentry); 2896 void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry); 2897 void ext4_fc_track_link(handle_t *handle, struct dentry *dentry); 2898 void __ext4_fc_track_create(handle_t *handle, struct inode *inode, 2899 struct dentry *dentry); 2900 void ext4_fc_track_create(handle_t *handle, struct dentry *dentry); 2901 void ext4_fc_track_inode(handle_t *handle, struct inode *inode); 2902 void ext4_fc_mark_ineligible(struct super_block *sb, int reason, handle_t *handle); 2903 void ext4_fc_start_update(struct inode *inode); 2904 void ext4_fc_stop_update(struct inode *inode); 2905 void ext4_fc_del(struct inode *inode); 2906 bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block); 2907 void ext4_fc_replay_cleanup(struct super_block *sb); 2908 int ext4_fc_commit(journal_t *journal, tid_t commit_tid); 2909 int __init ext4_fc_init_dentry_cache(void); 2910 void ext4_fc_destroy_dentry_cache(void); 2911 int ext4_fc_record_regions(struct super_block *sb, int ino, 2912 ext4_lblk_t lblk, ext4_fsblk_t pblk, 2913 int len, int replay); 2914 2915 /* mballoc.c */ 2916 extern const struct seq_operations ext4_mb_seq_groups_ops; 2917 extern const struct seq_operations ext4_mb_seq_structs_summary_ops; 2918 extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset); 2919 extern int ext4_mb_init(struct super_block *); 2920 extern void ext4_mb_release(struct super_block *); 2921 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2922 struct ext4_allocation_request *, int *); 2923 extern void ext4_discard_preallocations(struct inode *); 2924 extern int __init ext4_init_mballoc(void); 2925 extern void ext4_exit_mballoc(void); 2926 extern ext4_group_t ext4_mb_prefetch(struct super_block *sb, 2927 ext4_group_t group, 2928 unsigned int nr, int *cnt); 2929 extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group, 2930 unsigned int nr); 2931 2932 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2933 struct buffer_head *bh, ext4_fsblk_t block, 2934 unsigned long count, int flags); 2935 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2936 ext4_group_t ngroups); 2937 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2938 ext4_group_t i, struct ext4_group_desc *desc); 2939 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2940 ext4_fsblk_t block, unsigned long count); 2941 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2942 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid); 2943 extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block, 2944 int len, bool state); 2945 static inline bool ext4_mb_cr_expensive(enum criteria cr) 2946 { 2947 return cr >= CR_GOAL_LEN_SLOW; 2948 } 2949 2950 /* inode.c */ 2951 void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw, 2952 struct ext4_inode_info *ei); 2953 int ext4_inode_is_fast_symlink(struct inode *inode); 2954 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2955 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2956 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count, 2957 bool wait, struct buffer_head **bhs); 2958 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2959 struct buffer_head *bh_result, int create); 2960 int ext4_get_block(struct inode *inode, sector_t iblock, 2961 struct buffer_head *bh_result, int create); 2962 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2963 struct buffer_head *bh, int create); 2964 int ext4_walk_page_buffers(handle_t *handle, 2965 struct inode *inode, 2966 struct buffer_head *head, 2967 unsigned from, 2968 unsigned to, 2969 int *partial, 2970 int (*fn)(handle_t *handle, struct inode *inode, 2971 struct buffer_head *bh)); 2972 int do_journal_get_write_access(handle_t *handle, struct inode *inode, 2973 struct buffer_head *bh); 2974 #define FALL_BACK_TO_NONDELALLOC 1 2975 #define CONVERT_INLINE_DATA 2 2976 2977 typedef enum { 2978 EXT4_IGET_NORMAL = 0, 2979 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */ 2980 EXT4_IGET_HANDLE = 0x0002, /* Inode # is from a handle */ 2981 EXT4_IGET_BAD = 0x0004, /* Allow to iget a bad inode */ 2982 EXT4_IGET_EA_INODE = 0x0008 /* Inode should contain an EA value */ 2983 } ext4_iget_flags; 2984 2985 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, 2986 ext4_iget_flags flags, const char *function, 2987 unsigned int line); 2988 2989 #define ext4_iget(sb, ino, flags) \ 2990 __ext4_iget((sb), (ino), (flags), __func__, __LINE__) 2991 2992 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2993 extern int ext4_setattr(struct mnt_idmap *, struct dentry *, 2994 struct iattr *); 2995 extern u32 ext4_dio_alignment(struct inode *inode); 2996 extern int ext4_getattr(struct mnt_idmap *, const struct path *, 2997 struct kstat *, u32, unsigned int); 2998 extern void ext4_evict_inode(struct inode *); 2999 extern void ext4_clear_inode(struct inode *); 3000 extern int ext4_file_getattr(struct mnt_idmap *, const struct path *, 3001 struct kstat *, u32, unsigned int); 3002 extern void ext4_dirty_inode(struct inode *, int); 3003 extern int ext4_change_inode_journal_flag(struct inode *, int); 3004 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 3005 extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino, 3006 struct ext4_iloc *iloc); 3007 extern int ext4_inode_attach_jinode(struct inode *inode); 3008 extern int ext4_can_truncate(struct inode *inode); 3009 extern int ext4_truncate(struct inode *); 3010 extern int ext4_break_layouts(struct inode *); 3011 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length); 3012 extern void ext4_set_inode_flags(struct inode *, bool init); 3013 extern int ext4_alloc_da_blocks(struct inode *inode); 3014 extern void ext4_set_aops(struct inode *inode); 3015 extern int ext4_writepage_trans_blocks(struct inode *); 3016 extern int ext4_normal_submit_inode_data_buffers(struct jbd2_inode *jinode); 3017 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 3018 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 3019 loff_t lstart, loff_t lend); 3020 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf); 3021 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 3022 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 3023 extern void ext4_da_release_space(struct inode *inode, int to_free); 3024 extern void ext4_da_update_reserve_space(struct inode *inode, 3025 int used, int quota_claim); 3026 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 3027 ext4_fsblk_t pblk, ext4_lblk_t len); 3028 3029 /* indirect.c */ 3030 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 3031 struct ext4_map_blocks *map, int flags); 3032 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 3033 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 3034 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 3035 ext4_lblk_t start, ext4_lblk_t end); 3036 3037 /* ioctl.c */ 3038 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 3039 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 3040 int ext4_fileattr_set(struct mnt_idmap *idmap, 3041 struct dentry *dentry, struct fileattr *fa); 3042 int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa); 3043 extern void ext4_reset_inode_seed(struct inode *inode); 3044 int ext4_update_overhead(struct super_block *sb, bool force); 3045 int ext4_force_shutdown(struct super_block *sb, u32 flags); 3046 3047 /* migrate.c */ 3048 extern int ext4_ext_migrate(struct inode *); 3049 extern int ext4_ind_migrate(struct inode *inode); 3050 3051 /* namei.c */ 3052 extern int ext4_init_new_dir(handle_t *handle, struct inode *dir, 3053 struct inode *inode); 3054 extern int ext4_dirblock_csum_verify(struct inode *inode, 3055 struct buffer_head *bh); 3056 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 3057 __u32 start_minor_hash, __u32 *next_hash); 3058 extern int ext4_search_dir(struct buffer_head *bh, 3059 char *search_buf, 3060 int buf_size, 3061 struct inode *dir, 3062 struct ext4_filename *fname, 3063 unsigned int offset, 3064 struct ext4_dir_entry_2 **res_dir); 3065 extern int ext4_generic_delete_entry(struct inode *dir, 3066 struct ext4_dir_entry_2 *de_del, 3067 struct buffer_head *bh, 3068 void *entry_buf, 3069 int buf_size, 3070 int csum_size); 3071 extern bool ext4_empty_dir(struct inode *inode); 3072 3073 /* resize.c */ 3074 extern void ext4_kvfree_array_rcu(void *to_free); 3075 extern int ext4_group_add(struct super_block *sb, 3076 struct ext4_new_group_data *input); 3077 extern int ext4_group_extend(struct super_block *sb, 3078 struct ext4_super_block *es, 3079 ext4_fsblk_t n_blocks_count); 3080 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 3081 extern unsigned int ext4_list_backups(struct super_block *sb, 3082 unsigned int *three, unsigned int *five, 3083 unsigned int *seven); 3084 3085 /* super.c */ 3086 extern struct buffer_head *ext4_sb_bread(struct super_block *sb, 3087 sector_t block, blk_opf_t op_flags); 3088 extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb, 3089 sector_t block); 3090 extern void ext4_read_bh_nowait(struct buffer_head *bh, blk_opf_t op_flags, 3091 bh_end_io_t *end_io); 3092 extern int ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags, 3093 bh_end_io_t *end_io); 3094 extern int ext4_read_bh_lock(struct buffer_head *bh, blk_opf_t op_flags, bool wait); 3095 extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block); 3096 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 3097 extern int ext4_calculate_overhead(struct super_block *sb); 3098 extern __le32 ext4_superblock_csum(struct super_block *sb, 3099 struct ext4_super_block *es); 3100 extern void ext4_superblock_csum_set(struct super_block *sb); 3101 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 3102 ext4_group_t ngroup); 3103 extern const char *ext4_decode_error(struct super_block *sb, int errno, 3104 char nbuf[16]); 3105 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb, 3106 ext4_group_t block_group, 3107 unsigned int flags); 3108 extern unsigned int ext4_num_base_meta_blocks(struct super_block *sb, 3109 ext4_group_t block_group); 3110 3111 extern __printf(7, 8) 3112 void __ext4_error(struct super_block *, const char *, unsigned int, bool, 3113 int, __u64, const char *, ...); 3114 extern __printf(6, 7) 3115 void __ext4_error_inode(struct inode *, const char *, unsigned int, 3116 ext4_fsblk_t, int, const char *, ...); 3117 extern __printf(5, 6) 3118 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 3119 const char *, ...); 3120 extern void __ext4_std_error(struct super_block *, const char *, 3121 unsigned int, int); 3122 extern __printf(4, 5) 3123 void __ext4_warning(struct super_block *, const char *, unsigned int, 3124 const char *, ...); 3125 extern __printf(4, 5) 3126 void __ext4_warning_inode(const struct inode *inode, const char *function, 3127 unsigned int line, const char *fmt, ...); 3128 extern __printf(3, 4) 3129 void __ext4_msg(struct super_block *, const char *, const char *, ...); 3130 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 3131 const char *, unsigned int, const char *); 3132 extern __printf(7, 8) 3133 void __ext4_grp_locked_error(const char *, unsigned int, 3134 struct super_block *, ext4_group_t, 3135 unsigned long, ext4_fsblk_t, 3136 const char *, ...); 3137 3138 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 3139 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 3140 3141 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \ 3142 __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a) 3143 3144 #define ext4_error_inode_block(inode, block, err, fmt, a...) \ 3145 __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \ 3146 (fmt), ## a) 3147 3148 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 3149 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 3150 3151 #define ext4_abort(sb, err, fmt, a...) \ 3152 __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a) 3153 3154 #ifdef CONFIG_PRINTK 3155 3156 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 3157 __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__) 3158 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 3159 __ext4_error_inode((inode), (func), (line), (block), \ 3160 (err), (fmt), ##__VA_ARGS__) 3161 #define ext4_error_file(file, func, line, block, fmt, ...) \ 3162 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 3163 #define ext4_error(sb, fmt, ...) \ 3164 __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt), \ 3165 ##__VA_ARGS__) 3166 #define ext4_error_err(sb, err, fmt, ...) \ 3167 __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt), \ 3168 ##__VA_ARGS__) 3169 #define ext4_warning(sb, fmt, ...) \ 3170 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 3171 #define ext4_warning_inode(inode, fmt, ...) \ 3172 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 3173 #define ext4_msg(sb, level, fmt, ...) \ 3174 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 3175 #define dump_mmp_msg(sb, mmp, msg) \ 3176 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 3177 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 3178 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 3179 fmt, ##__VA_ARGS__) 3180 3181 #else 3182 3183 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 3184 do { \ 3185 no_printk(fmt, ##__VA_ARGS__); \ 3186 __ext4_error_inode(inode, "", 0, block, 0, " "); \ 3187 } while (0) 3188 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 3189 do { \ 3190 no_printk(fmt, ##__VA_ARGS__); \ 3191 __ext4_error_inode(inode, "", 0, block, err, " "); \ 3192 } while (0) 3193 #define ext4_error_file(file, func, line, block, fmt, ...) \ 3194 do { \ 3195 no_printk(fmt, ##__VA_ARGS__); \ 3196 __ext4_error_file(file, "", 0, block, " "); \ 3197 } while (0) 3198 #define ext4_error(sb, fmt, ...) \ 3199 do { \ 3200 no_printk(fmt, ##__VA_ARGS__); \ 3201 __ext4_error(sb, "", 0, false, 0, 0, " "); \ 3202 } while (0) 3203 #define ext4_error_err(sb, err, fmt, ...) \ 3204 do { \ 3205 no_printk(fmt, ##__VA_ARGS__); \ 3206 __ext4_error(sb, "", 0, false, err, 0, " "); \ 3207 } while (0) 3208 #define ext4_warning(sb, fmt, ...) \ 3209 do { \ 3210 no_printk(fmt, ##__VA_ARGS__); \ 3211 __ext4_warning(sb, "", 0, " "); \ 3212 } while (0) 3213 #define ext4_warning_inode(inode, fmt, ...) \ 3214 do { \ 3215 no_printk(fmt, ##__VA_ARGS__); \ 3216 __ext4_warning_inode(inode, "", 0, " "); \ 3217 } while (0) 3218 #define ext4_msg(sb, level, fmt, ...) \ 3219 do { \ 3220 no_printk(fmt, ##__VA_ARGS__); \ 3221 __ext4_msg(sb, "", " "); \ 3222 } while (0) 3223 #define dump_mmp_msg(sb, mmp, msg) \ 3224 __dump_mmp_msg(sb, mmp, "", 0, "") 3225 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 3226 do { \ 3227 no_printk(fmt, ##__VA_ARGS__); \ 3228 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 3229 } while (0) 3230 3231 #endif 3232 3233 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 3234 struct ext4_group_desc *bg); 3235 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 3236 struct ext4_group_desc *bg); 3237 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 3238 struct ext4_group_desc *bg); 3239 extern __u32 ext4_free_group_clusters(struct super_block *sb, 3240 struct ext4_group_desc *bg); 3241 extern __u32 ext4_free_inodes_count(struct super_block *sb, 3242 struct ext4_group_desc *bg); 3243 extern __u32 ext4_used_dirs_count(struct super_block *sb, 3244 struct ext4_group_desc *bg); 3245 extern __u32 ext4_itable_unused_count(struct super_block *sb, 3246 struct ext4_group_desc *bg); 3247 extern void ext4_block_bitmap_set(struct super_block *sb, 3248 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3249 extern void ext4_inode_bitmap_set(struct super_block *sb, 3250 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3251 extern void ext4_inode_table_set(struct super_block *sb, 3252 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3253 extern void ext4_free_group_clusters_set(struct super_block *sb, 3254 struct ext4_group_desc *bg, 3255 __u32 count); 3256 extern void ext4_free_inodes_set(struct super_block *sb, 3257 struct ext4_group_desc *bg, __u32 count); 3258 extern void ext4_used_dirs_set(struct super_block *sb, 3259 struct ext4_group_desc *bg, __u32 count); 3260 extern void ext4_itable_unused_set(struct super_block *sb, 3261 struct ext4_group_desc *bg, __u32 count); 3262 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 3263 struct ext4_group_desc *gdp); 3264 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 3265 struct ext4_group_desc *gdp); 3266 extern int ext4_register_li_request(struct super_block *sb, 3267 ext4_group_t first_not_zeroed); 3268 3269 static inline int ext4_has_metadata_csum(struct super_block *sb) 3270 { 3271 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 3272 !EXT4_SB(sb)->s_chksum_driver); 3273 3274 return ext4_has_feature_metadata_csum(sb) && 3275 (EXT4_SB(sb)->s_chksum_driver != NULL); 3276 } 3277 3278 static inline int ext4_has_group_desc_csum(struct super_block *sb) 3279 { 3280 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb); 3281 } 3282 3283 #define ext4_read_incompat_64bit_val(es, name) \ 3284 (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \ 3285 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \ 3286 le32_to_cpu(es->name##_lo)) 3287 3288 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 3289 { 3290 return ext4_read_incompat_64bit_val(es, s_blocks_count); 3291 } 3292 3293 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 3294 { 3295 return ext4_read_incompat_64bit_val(es, s_r_blocks_count); 3296 } 3297 3298 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 3299 { 3300 return ext4_read_incompat_64bit_val(es, s_free_blocks_count); 3301 } 3302 3303 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 3304 ext4_fsblk_t blk) 3305 { 3306 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 3307 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 3308 } 3309 3310 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 3311 ext4_fsblk_t blk) 3312 { 3313 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 3314 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 3315 } 3316 3317 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 3318 ext4_fsblk_t blk) 3319 { 3320 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 3321 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 3322 } 3323 3324 static inline loff_t ext4_isize(struct super_block *sb, 3325 struct ext4_inode *raw_inode) 3326 { 3327 if (ext4_has_feature_largedir(sb) || 3328 S_ISREG(le16_to_cpu(raw_inode->i_mode))) 3329 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 3330 le32_to_cpu(raw_inode->i_size_lo); 3331 3332 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 3333 } 3334 3335 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 3336 { 3337 raw_inode->i_size_lo = cpu_to_le32(i_size); 3338 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 3339 } 3340 3341 /* 3342 * Reading s_groups_count requires using smp_rmb() afterwards. See 3343 * the locking protocol documented in the comments of ext4_group_add() 3344 * in resize.c 3345 */ 3346 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 3347 { 3348 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 3349 3350 smp_rmb(); 3351 return ngroups; 3352 } 3353 3354 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 3355 ext4_group_t block_group) 3356 { 3357 return block_group >> sbi->s_log_groups_per_flex; 3358 } 3359 3360 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 3361 { 3362 return 1 << sbi->s_log_groups_per_flex; 3363 } 3364 3365 #define ext4_std_error(sb, errno) \ 3366 do { \ 3367 if ((errno)) \ 3368 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 3369 } while (0) 3370 3371 #ifdef CONFIG_SMP 3372 /* Each CPU can accumulate percpu_counter_batch clusters in their local 3373 * counters. So we need to make sure we have free clusters more 3374 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 3375 */ 3376 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 3377 #else 3378 #define EXT4_FREECLUSTERS_WATERMARK 0 3379 #endif 3380 3381 /* Update i_disksize. Requires i_rwsem to avoid races with truncate */ 3382 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 3383 { 3384 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 3385 !inode_is_locked(inode)); 3386 down_write(&EXT4_I(inode)->i_data_sem); 3387 if (newsize > EXT4_I(inode)->i_disksize) 3388 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize); 3389 up_write(&EXT4_I(inode)->i_data_sem); 3390 } 3391 3392 /* Update i_size, i_disksize. Requires i_rwsem to avoid races with truncate */ 3393 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 3394 { 3395 int changed = 0; 3396 3397 if (newsize > inode->i_size) { 3398 i_size_write(inode, newsize); 3399 changed = 1; 3400 } 3401 if (newsize > EXT4_I(inode)->i_disksize) { 3402 ext4_update_i_disksize(inode, newsize); 3403 changed |= 2; 3404 } 3405 return changed; 3406 } 3407 3408 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 3409 loff_t len); 3410 3411 struct ext4_group_info { 3412 unsigned long bb_state; 3413 #ifdef AGGRESSIVE_CHECK 3414 unsigned long bb_check_counter; 3415 #endif 3416 struct rb_root bb_free_root; 3417 ext4_grpblk_t bb_first_free; /* first free block */ 3418 ext4_grpblk_t bb_free; /* total free blocks */ 3419 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 3420 int bb_avg_fragment_size_order; /* order of average 3421 fragment in BG */ 3422 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 3423 ext4_group_t bb_group; /* Group number */ 3424 struct list_head bb_prealloc_list; 3425 #ifdef DOUBLE_CHECK 3426 void *bb_bitmap; 3427 #endif 3428 struct rw_semaphore alloc_sem; 3429 struct list_head bb_avg_fragment_size_node; 3430 struct list_head bb_largest_free_order_node; 3431 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 3432 * regions, index is order. 3433 * bb_counters[3] = 5 means 3434 * 5 free 8-block regions. */ 3435 }; 3436 3437 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 3438 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 3439 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 3440 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 3441 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \ 3442 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT) 3443 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \ 3444 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT) 3445 #define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4 3446 3447 #define EXT4_MB_GRP_NEED_INIT(grp) \ 3448 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 3449 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 3450 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3451 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 3452 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3453 3454 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 3455 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3456 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 3457 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3458 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 3459 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3460 #define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \ 3461 (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state))) 3462 3463 #define EXT4_MAX_CONTENTION 8 3464 #define EXT4_CONTENTION_THRESHOLD 2 3465 3466 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 3467 ext4_group_t group) 3468 { 3469 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 3470 } 3471 3472 /* 3473 * Returns true if the filesystem is busy enough that attempts to 3474 * access the block group locks has run into contention. 3475 */ 3476 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 3477 { 3478 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 3479 } 3480 3481 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 3482 { 3483 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 3484 if (spin_trylock(lock)) 3485 /* 3486 * We're able to grab the lock right away, so drop the 3487 * lock contention counter. 3488 */ 3489 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 3490 else { 3491 /* 3492 * The lock is busy, so bump the contention counter, 3493 * and then wait on the spin lock. 3494 */ 3495 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 3496 EXT4_MAX_CONTENTION); 3497 spin_lock(lock); 3498 } 3499 } 3500 3501 static inline void ext4_unlock_group(struct super_block *sb, 3502 ext4_group_t group) 3503 { 3504 spin_unlock(ext4_group_lock_ptr(sb, group)); 3505 } 3506 3507 #ifdef CONFIG_QUOTA 3508 static inline bool ext4_quota_capable(struct super_block *sb) 3509 { 3510 return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb)); 3511 } 3512 3513 static inline bool ext4_is_quota_journalled(struct super_block *sb) 3514 { 3515 struct ext4_sb_info *sbi = EXT4_SB(sb); 3516 3517 return (ext4_has_feature_quota(sb) || 3518 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]); 3519 } 3520 int ext4_enable_quotas(struct super_block *sb); 3521 #endif 3522 3523 /* 3524 * Block validity checking 3525 */ 3526 #define ext4_check_indirect_blockref(inode, bh) \ 3527 ext4_check_blockref(__func__, __LINE__, inode, \ 3528 (__le32 *)(bh)->b_data, \ 3529 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 3530 3531 #define ext4_ind_check_inode(inode) \ 3532 ext4_check_blockref(__func__, __LINE__, inode, \ 3533 EXT4_I(inode)->i_data, \ 3534 EXT4_NDIR_BLOCKS) 3535 3536 /* 3537 * Inodes and files operations 3538 */ 3539 3540 /* dir.c */ 3541 extern const struct file_operations ext4_dir_operations; 3542 3543 /* file.c */ 3544 extern const struct inode_operations ext4_file_inode_operations; 3545 extern const struct file_operations ext4_file_operations; 3546 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 3547 3548 /* inline.c */ 3549 extern int ext4_get_max_inline_size(struct inode *inode); 3550 extern int ext4_find_inline_data_nolock(struct inode *inode); 3551 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 3552 3553 int ext4_readpage_inline(struct inode *inode, struct folio *folio); 3554 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 3555 struct inode *inode, 3556 loff_t pos, unsigned len, 3557 struct page **pagep); 3558 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len, 3559 unsigned copied, struct folio *folio); 3560 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 3561 struct inode *inode, 3562 loff_t pos, unsigned len, 3563 struct page **pagep, 3564 void **fsdata); 3565 extern int ext4_try_add_inline_entry(handle_t *handle, 3566 struct ext4_filename *fname, 3567 struct inode *dir, struct inode *inode); 3568 extern int ext4_try_create_inline_dir(handle_t *handle, 3569 struct inode *parent, 3570 struct inode *inode); 3571 extern int ext4_read_inline_dir(struct file *filp, 3572 struct dir_context *ctx, 3573 int *has_inline_data); 3574 extern int ext4_inlinedir_to_tree(struct file *dir_file, 3575 struct inode *dir, ext4_lblk_t block, 3576 struct dx_hash_info *hinfo, 3577 __u32 start_hash, __u32 start_minor_hash, 3578 int *has_inline_data); 3579 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3580 struct ext4_filename *fname, 3581 struct ext4_dir_entry_2 **res_dir, 3582 int *has_inline_data); 3583 extern int ext4_delete_inline_entry(handle_t *handle, 3584 struct inode *dir, 3585 struct ext4_dir_entry_2 *de_del, 3586 struct buffer_head *bh, 3587 int *has_inline_data); 3588 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); 3589 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3590 struct ext4_dir_entry_2 **parent_de, 3591 int *retval); 3592 extern void *ext4_read_inline_link(struct inode *inode); 3593 3594 struct iomap; 3595 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap); 3596 3597 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3598 3599 extern int ext4_convert_inline_data(struct inode *inode); 3600 3601 static inline int ext4_has_inline_data(struct inode *inode) 3602 { 3603 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3604 EXT4_I(inode)->i_inline_off; 3605 } 3606 3607 /* namei.c */ 3608 extern const struct inode_operations ext4_dir_inode_operations; 3609 extern const struct inode_operations ext4_special_inode_operations; 3610 extern struct dentry *ext4_get_parent(struct dentry *child); 3611 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3612 struct ext4_dir_entry_2 *de, 3613 int blocksize, int csum_size, 3614 unsigned int parent_ino, int dotdot_real_len); 3615 extern void ext4_initialize_dirent_tail(struct buffer_head *bh, 3616 unsigned int blocksize); 3617 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode, 3618 struct buffer_head *bh); 3619 extern int __ext4_unlink(struct inode *dir, const struct qstr *d_name, 3620 struct inode *inode, struct dentry *dentry); 3621 extern int __ext4_link(struct inode *dir, struct inode *inode, 3622 struct dentry *dentry); 3623 3624 #define S_SHIFT 12 3625 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = { 3626 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3627 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3628 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3629 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3630 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3631 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3632 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3633 }; 3634 3635 static inline void ext4_set_de_type(struct super_block *sb, 3636 struct ext4_dir_entry_2 *de, 3637 umode_t mode) { 3638 if (ext4_has_feature_filetype(sb)) 3639 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3640 } 3641 3642 /* readpages.c */ 3643 extern int ext4_mpage_readpages(struct inode *inode, 3644 struct readahead_control *rac, struct folio *folio); 3645 extern int __init ext4_init_post_read_processing(void); 3646 extern void ext4_exit_post_read_processing(void); 3647 3648 /* symlink.c */ 3649 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3650 extern const struct inode_operations ext4_symlink_inode_operations; 3651 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3652 3653 /* sysfs.c */ 3654 extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi); 3655 extern int ext4_register_sysfs(struct super_block *sb); 3656 extern void ext4_unregister_sysfs(struct super_block *sb); 3657 extern int __init ext4_init_sysfs(void); 3658 extern void ext4_exit_sysfs(void); 3659 3660 /* block_validity */ 3661 extern void ext4_release_system_zone(struct super_block *sb); 3662 extern int ext4_setup_system_zone(struct super_block *sb); 3663 extern int __init ext4_init_system_zone(void); 3664 extern void ext4_exit_system_zone(void); 3665 extern int ext4_inode_block_valid(struct inode *inode, 3666 ext4_fsblk_t start_blk, 3667 unsigned int count); 3668 extern int ext4_check_blockref(const char *, unsigned int, 3669 struct inode *, __le32 *, unsigned int); 3670 extern int ext4_sb_block_valid(struct super_block *sb, struct inode *inode, 3671 ext4_fsblk_t start_blk, unsigned int count); 3672 3673 3674 /* extents.c */ 3675 struct ext4_ext_path; 3676 struct ext4_extent; 3677 3678 /* 3679 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3680 * __le32. 3681 */ 3682 #define EXT_MAX_BLOCKS 0xffffffff 3683 3684 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode); 3685 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3686 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3687 struct ext4_map_blocks *map, int flags); 3688 extern int ext4_ext_truncate(handle_t *, struct inode *); 3689 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3690 ext4_lblk_t end); 3691 extern void ext4_ext_init(struct super_block *); 3692 extern void ext4_ext_release(struct super_block *); 3693 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3694 loff_t len); 3695 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3696 loff_t offset, ssize_t len); 3697 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle, 3698 ext4_io_end_t *io_end); 3699 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3700 struct ext4_map_blocks *map, int flags); 3701 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3702 int num, 3703 struct ext4_ext_path *path); 3704 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3705 struct ext4_ext_path **, 3706 struct ext4_extent *, int); 3707 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3708 struct ext4_ext_path **, 3709 int flags); 3710 extern void ext4_free_ext_path(struct ext4_ext_path *); 3711 extern int ext4_ext_check_inode(struct inode *inode); 3712 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3713 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3714 __u64 start, __u64 len); 3715 extern int ext4_get_es_cache(struct inode *inode, 3716 struct fiemap_extent_info *fieinfo, 3717 __u64 start, __u64 len); 3718 extern int ext4_ext_precache(struct inode *inode); 3719 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3720 struct inode *inode2, ext4_lblk_t lblk1, 3721 ext4_lblk_t lblk2, ext4_lblk_t count, 3722 int mark_unwritten,int *err); 3723 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu); 3724 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode, 3725 int check_cred, int restart_cred, 3726 int revoke_cred); 3727 extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end); 3728 extern int ext4_ext_replay_set_iblocks(struct inode *inode); 3729 extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start, 3730 int len, int unwritten, ext4_fsblk_t pblk); 3731 extern int ext4_ext_clear_bb(struct inode *inode); 3732 3733 3734 /* move_extent.c */ 3735 extern void ext4_double_down_write_data_sem(struct inode *first, 3736 struct inode *second); 3737 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3738 struct inode *donor_inode); 3739 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3740 __u64 start_orig, __u64 start_donor, 3741 __u64 len, __u64 *moved_len); 3742 3743 /* page-io.c */ 3744 extern int __init ext4_init_pageio(void); 3745 extern void ext4_exit_pageio(void); 3746 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3747 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3748 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3749 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3750 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3751 struct writeback_control *wbc); 3752 extern void ext4_end_io_rsv_work(struct work_struct *work); 3753 extern void ext4_io_submit(struct ext4_io_submit *io); 3754 int ext4_bio_write_folio(struct ext4_io_submit *io, struct folio *page, 3755 size_t len); 3756 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end); 3757 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end); 3758 3759 /* mmp.c */ 3760 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3761 3762 /* mmp.c */ 3763 extern void ext4_stop_mmpd(struct ext4_sb_info *sbi); 3764 3765 /* verity.c */ 3766 extern const struct fsverity_operations ext4_verityops; 3767 3768 /* orphan.c */ 3769 extern int ext4_orphan_add(handle_t *, struct inode *); 3770 extern int ext4_orphan_del(handle_t *, struct inode *); 3771 extern void ext4_orphan_cleanup(struct super_block *sb, 3772 struct ext4_super_block *es); 3773 extern void ext4_release_orphan_info(struct super_block *sb); 3774 extern int ext4_init_orphan_info(struct super_block *sb); 3775 extern int ext4_orphan_file_empty(struct super_block *sb); 3776 extern void ext4_orphan_file_block_trigger( 3777 struct jbd2_buffer_trigger_type *triggers, 3778 struct buffer_head *bh, 3779 void *data, size_t size); 3780 3781 /* 3782 * Add new method to test whether block and inode bitmaps are properly 3783 * initialized. With uninit_bg reading the block from disk is not enough 3784 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3785 */ 3786 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3787 3788 static inline int bitmap_uptodate(struct buffer_head *bh) 3789 { 3790 return (buffer_uptodate(bh) && 3791 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3792 } 3793 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3794 { 3795 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3796 } 3797 3798 /* For ioend & aio unwritten conversion wait queues */ 3799 #define EXT4_WQ_HASH_SZ 37 3800 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3801 EXT4_WQ_HASH_SZ]) 3802 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3803 3804 extern int ext4_resize_begin(struct super_block *sb); 3805 extern int ext4_resize_end(struct super_block *sb, bool update_backups); 3806 3807 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 3808 struct ext4_io_end *io_end) 3809 { 3810 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 3811 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3812 atomic_inc(&EXT4_I(inode)->i_unwritten); 3813 } 3814 } 3815 3816 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3817 { 3818 struct inode *inode = io_end->inode; 3819 3820 if (io_end->flag & EXT4_IO_END_UNWRITTEN) { 3821 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3822 /* Wake up anyone waiting on unwritten extent conversion */ 3823 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) 3824 wake_up_all(ext4_ioend_wq(inode)); 3825 } 3826 } 3827 3828 extern const struct iomap_ops ext4_iomap_ops; 3829 extern const struct iomap_ops ext4_iomap_overwrite_ops; 3830 extern const struct iomap_ops ext4_iomap_report_ops; 3831 3832 static inline int ext4_buffer_uptodate(struct buffer_head *bh) 3833 { 3834 /* 3835 * If the buffer has the write error flag, we have failed 3836 * to write out data in the block. In this case, we don't 3837 * have to read the block because we may read the old data 3838 * successfully. 3839 */ 3840 if (buffer_write_io_error(bh)) 3841 set_buffer_uptodate(bh); 3842 return buffer_uptodate(bh); 3843 } 3844 3845 #endif /* __KERNEL__ */ 3846 3847 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3848 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3849 3850 #endif /* _EXT4_H */ 3851