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 /* criteria below which we use fast block scanning and avoid unnecessary IO */ 180 #define CR_FAST CR_GOAL_LEN_SLOW 181 182 /* 183 * Flags used in mballoc's allocation_context flags field. 184 * 185 * Also used to show what's going on for debugging purposes when the 186 * flag field is exported via the traceport interface 187 */ 188 189 /* prefer goal again. length */ 190 #define EXT4_MB_HINT_MERGE 0x0001 191 /* blocks already reserved */ 192 #define EXT4_MB_HINT_RESERVED 0x0002 193 /* metadata is being allocated */ 194 #define EXT4_MB_HINT_METADATA 0x0004 195 /* first blocks in the file */ 196 #define EXT4_MB_HINT_FIRST 0x0008 197 /* search for the best chunk */ 198 #define EXT4_MB_HINT_BEST 0x0010 199 /* data is being allocated */ 200 #define EXT4_MB_HINT_DATA 0x0020 201 /* don't preallocate (for tails) */ 202 #define EXT4_MB_HINT_NOPREALLOC 0x0040 203 /* allocate for locality group */ 204 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 205 /* allocate goal blocks or none */ 206 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 207 /* goal is meaningful */ 208 #define EXT4_MB_HINT_TRY_GOAL 0x0200 209 /* blocks already pre-reserved by delayed allocation */ 210 #define EXT4_MB_DELALLOC_RESERVED 0x0400 211 /* We are doing stream allocation */ 212 #define EXT4_MB_STREAM_ALLOC 0x0800 213 /* Use reserved root blocks if needed */ 214 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 215 /* Use blocks from reserved pool */ 216 #define EXT4_MB_USE_RESERVED 0x2000 217 /* Do strict check for free blocks while retrying block allocation */ 218 #define EXT4_MB_STRICT_CHECK 0x4000 219 /* Large fragment size list lookup succeeded at least once for cr = 0 */ 220 #define EXT4_MB_CR_POWER2_ALIGNED_OPTIMIZED 0x8000 221 /* Avg fragment size rb tree lookup succeeded at least once for cr = 1 */ 222 #define EXT4_MB_CR_GOAL_LEN_FAST_OPTIMIZED 0x00010000 223 /* Avg fragment size rb tree lookup succeeded at least once for cr = 1.5 */ 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_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 259 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 260 261 struct ext4_map_blocks { 262 ext4_fsblk_t m_pblk; 263 ext4_lblk_t m_lblk; 264 unsigned int m_len; 265 unsigned int m_flags; 266 }; 267 268 /* 269 * Block validity checking, system zone rbtree. 270 */ 271 struct ext4_system_blocks { 272 struct rb_root root; 273 struct rcu_head rcu; 274 }; 275 276 /* 277 * Flags for ext4_io_end->flags 278 */ 279 #define EXT4_IO_END_UNWRITTEN 0x0001 280 281 struct ext4_io_end_vec { 282 struct list_head list; /* list of io_end_vec */ 283 loff_t offset; /* offset in the file */ 284 ssize_t size; /* size of the extent */ 285 }; 286 287 /* 288 * For converting unwritten extents on a work queue. 'handle' is used for 289 * buffered writeback. 290 */ 291 typedef struct ext4_io_end { 292 struct list_head list; /* per-file finished IO list */ 293 handle_t *handle; /* handle reserved for extent 294 * conversion */ 295 struct inode *inode; /* file being written to */ 296 struct bio *bio; /* Linked list of completed 297 * bios covering the extent */ 298 unsigned int flag; /* unwritten or not */ 299 refcount_t count; /* reference counter */ 300 struct list_head list_vec; /* list of ext4_io_end_vec */ 301 } ext4_io_end_t; 302 303 struct ext4_io_submit { 304 struct writeback_control *io_wbc; 305 struct bio *io_bio; 306 ext4_io_end_t *io_end; 307 sector_t io_next_block; 308 }; 309 310 /* 311 * Special inodes numbers 312 */ 313 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 314 #define EXT4_ROOT_INO 2 /* Root inode */ 315 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 316 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 317 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 318 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 319 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 320 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 321 322 /* First non-reserved inode for old ext4 filesystems */ 323 #define EXT4_GOOD_OLD_FIRST_INO 11 324 325 /* 326 * Maximal count of links to a file 327 */ 328 #define EXT4_LINK_MAX 65000 329 330 /* 331 * Macro-instructions used to manage several block sizes 332 */ 333 #define EXT4_MIN_BLOCK_SIZE 1024 334 #define EXT4_MAX_BLOCK_SIZE 65536 335 #define EXT4_MIN_BLOCK_LOG_SIZE 10 336 #define EXT4_MAX_BLOCK_LOG_SIZE 16 337 #define EXT4_MAX_CLUSTER_LOG_SIZE 30 338 #ifdef __KERNEL__ 339 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 340 #else 341 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 342 #endif 343 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 344 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 345 EXT4_SB(s)->s_cluster_bits) 346 #ifdef __KERNEL__ 347 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 348 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 349 #else 350 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 351 #endif 352 #ifdef __KERNEL__ 353 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 354 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 355 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 356 #else 357 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 358 EXT4_GOOD_OLD_INODE_SIZE : \ 359 (s)->s_inode_size) 360 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 361 EXT4_GOOD_OLD_FIRST_INO : \ 362 (s)->s_first_ino) 363 #endif 364 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 365 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \ 366 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \ 367 blkbits)) 368 369 /* Translate a block number to a cluster number */ 370 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 371 /* Translate a cluster number to a block number */ 372 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 373 /* Translate # of blks to # of clusters */ 374 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 375 (sbi)->s_cluster_bits) 376 /* Mask out the low bits to get the starting block of the cluster */ 377 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 378 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 379 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 380 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 381 /* Fill in the low bits to get the last block of the cluster */ 382 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \ 383 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1)) 384 /* Get the cluster offset */ 385 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 386 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 387 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 388 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 389 390 /* 391 * Structure of a blocks group descriptor 392 */ 393 struct ext4_group_desc 394 { 395 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 396 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 397 __le32 bg_inode_table_lo; /* Inodes table block */ 398 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 399 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 400 __le16 bg_used_dirs_count_lo; /* Directories count */ 401 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 402 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 403 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 404 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 405 __le16 bg_itable_unused_lo; /* Unused inodes count */ 406 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 407 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 408 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 409 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 410 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 411 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 412 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 413 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 414 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 415 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 416 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 417 __u32 bg_reserved; 418 }; 419 420 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 421 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 422 sizeof(__le16)) 423 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 424 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 425 sizeof(__le16)) 426 427 /* 428 * Structure of a flex block group info 429 */ 430 431 struct flex_groups { 432 atomic64_t free_clusters; 433 atomic_t free_inodes; 434 atomic_t used_dirs; 435 }; 436 437 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 438 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 439 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 440 441 /* 442 * Macro-instructions used to manage group descriptors 443 */ 444 #define EXT4_MIN_DESC_SIZE 32 445 #define EXT4_MIN_DESC_SIZE_64BIT 64 446 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 447 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 448 #ifdef __KERNEL__ 449 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 450 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 451 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 452 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 453 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 454 #else 455 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 456 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 457 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 458 #endif 459 460 /* 461 * Constants relative to the data blocks 462 */ 463 #define EXT4_NDIR_BLOCKS 12 464 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 465 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 466 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 467 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 468 469 /* 470 * Inode flags 471 */ 472 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 473 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 474 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 475 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 476 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 477 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 478 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 479 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 480 /* Reserved for compression usage... */ 481 #define EXT4_DIRTY_FL 0x00000100 482 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 483 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 484 /* nb: was previously EXT2_ECOMPR_FL */ 485 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 486 /* End compression flags --- maybe not all used */ 487 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 488 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 489 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 490 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 491 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 492 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 493 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 494 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 495 #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */ 496 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 497 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */ 498 499 #define EXT4_DAX_FL 0x02000000 /* Inode is DAX */ 500 501 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 502 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 503 #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */ 504 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 505 506 /* User modifiable flags */ 507 #define EXT4_FL_USER_MODIFIABLE (EXT4_SECRM_FL | \ 508 EXT4_UNRM_FL | \ 509 EXT4_COMPR_FL | \ 510 EXT4_SYNC_FL | \ 511 EXT4_IMMUTABLE_FL | \ 512 EXT4_APPEND_FL | \ 513 EXT4_NODUMP_FL | \ 514 EXT4_NOATIME_FL | \ 515 EXT4_JOURNAL_DATA_FL | \ 516 EXT4_NOTAIL_FL | \ 517 EXT4_DIRSYNC_FL | \ 518 EXT4_TOPDIR_FL | \ 519 EXT4_EXTENTS_FL | \ 520 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \ 521 EXT4_DAX_FL | \ 522 EXT4_PROJINHERIT_FL | \ 523 EXT4_CASEFOLD_FL) 524 525 /* User visible flags */ 526 #define EXT4_FL_USER_VISIBLE (EXT4_FL_USER_MODIFIABLE | \ 527 EXT4_DIRTY_FL | \ 528 EXT4_COMPRBLK_FL | \ 529 EXT4_NOCOMPR_FL | \ 530 EXT4_ENCRYPT_FL | \ 531 EXT4_INDEX_FL | \ 532 EXT4_VERITY_FL | \ 533 EXT4_INLINE_DATA_FL) 534 535 /* Flags that should be inherited by new inodes from their parent. */ 536 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 537 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 538 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 539 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 540 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\ 541 EXT4_DAX_FL) 542 543 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 544 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\ 545 EXT4_PROJINHERIT_FL)) 546 547 /* Flags that are appropriate for non-directories/regular files. */ 548 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 549 550 /* The only flags that should be swapped */ 551 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL) 552 553 /* Flags which are mutually exclusive to DAX */ 554 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\ 555 EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL) 556 557 /* Mask out flags that are inappropriate for the given type of inode. */ 558 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 559 { 560 if (S_ISDIR(mode)) 561 return flags; 562 else if (S_ISREG(mode)) 563 return flags & EXT4_REG_FLMASK; 564 else 565 return flags & EXT4_OTHER_FLMASK; 566 } 567 568 /* 569 * Inode flags used for atomic set/get 570 */ 571 enum { 572 EXT4_INODE_SECRM = 0, /* Secure deletion */ 573 EXT4_INODE_UNRM = 1, /* Undelete */ 574 EXT4_INODE_COMPR = 2, /* Compress file */ 575 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 576 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 577 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 578 EXT4_INODE_NODUMP = 6, /* do not dump file */ 579 EXT4_INODE_NOATIME = 7, /* do not update atime */ 580 /* Reserved for compression usage... */ 581 EXT4_INODE_DIRTY = 8, 582 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 583 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 584 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 585 /* End compression flags --- maybe not all used */ 586 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 587 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 588 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 589 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 590 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 591 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 592 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 593 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 594 EXT4_INODE_VERITY = 20, /* Verity protected inode */ 595 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 596 /* 22 was formerly EXT4_INODE_EOFBLOCKS */ 597 EXT4_INODE_DAX = 25, /* Inode is DAX */ 598 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 599 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 600 EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */ 601 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 602 }; 603 604 /* 605 * Since it's pretty easy to mix up bit numbers and hex values, we use a 606 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 607 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 608 * any extra space in the compiled kernel image, otherwise, the build will fail. 609 * It's important that these values are the same, since we are using 610 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 611 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 612 * values found in ext2, ext3 and ext4 filesystems, and of course the values 613 * defined in e2fsprogs. 614 * 615 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 616 */ 617 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1U << EXT4_INODE_##FLAG)) 618 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 619 620 static inline void ext4_check_flag_values(void) 621 { 622 CHECK_FLAG_VALUE(SECRM); 623 CHECK_FLAG_VALUE(UNRM); 624 CHECK_FLAG_VALUE(COMPR); 625 CHECK_FLAG_VALUE(SYNC); 626 CHECK_FLAG_VALUE(IMMUTABLE); 627 CHECK_FLAG_VALUE(APPEND); 628 CHECK_FLAG_VALUE(NODUMP); 629 CHECK_FLAG_VALUE(NOATIME); 630 CHECK_FLAG_VALUE(DIRTY); 631 CHECK_FLAG_VALUE(COMPRBLK); 632 CHECK_FLAG_VALUE(NOCOMPR); 633 CHECK_FLAG_VALUE(ENCRYPT); 634 CHECK_FLAG_VALUE(INDEX); 635 CHECK_FLAG_VALUE(IMAGIC); 636 CHECK_FLAG_VALUE(JOURNAL_DATA); 637 CHECK_FLAG_VALUE(NOTAIL); 638 CHECK_FLAG_VALUE(DIRSYNC); 639 CHECK_FLAG_VALUE(TOPDIR); 640 CHECK_FLAG_VALUE(HUGE_FILE); 641 CHECK_FLAG_VALUE(EXTENTS); 642 CHECK_FLAG_VALUE(VERITY); 643 CHECK_FLAG_VALUE(EA_INODE); 644 CHECK_FLAG_VALUE(INLINE_DATA); 645 CHECK_FLAG_VALUE(PROJINHERIT); 646 CHECK_FLAG_VALUE(CASEFOLD); 647 CHECK_FLAG_VALUE(RESERVED); 648 } 649 650 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 651 struct compat_ext4_new_group_input { 652 u32 group; 653 compat_u64 block_bitmap; 654 compat_u64 inode_bitmap; 655 compat_u64 inode_table; 656 u32 blocks_count; 657 u16 reserved_blocks; 658 u16 unused; 659 }; 660 #endif 661 662 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 663 struct ext4_new_group_data { 664 __u32 group; 665 __u64 block_bitmap; 666 __u64 inode_bitmap; 667 __u64 inode_table; 668 __u32 blocks_count; 669 __u16 reserved_blocks; 670 __u16 mdata_blocks; 671 __u32 free_clusters_count; 672 }; 673 674 /* Indexes used to index group tables in ext4_new_group_data */ 675 enum { 676 BLOCK_BITMAP = 0, /* block bitmap */ 677 INODE_BITMAP, /* inode bitmap */ 678 INODE_TABLE, /* inode tables */ 679 GROUP_TABLE_COUNT, 680 }; 681 682 /* 683 * Flags used by ext4_map_blocks() 684 */ 685 /* Allocate any needed blocks and/or convert an unwritten 686 extent to be an initialized ext4 */ 687 #define EXT4_GET_BLOCKS_CREATE 0x0001 688 /* Request the creation of an unwritten extent */ 689 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 690 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 691 EXT4_GET_BLOCKS_CREATE) 692 /* Caller is from the delayed allocation writeout path 693 * finally doing the actual allocation of delayed blocks */ 694 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 695 /* caller is from the direct IO path, request to creation of an 696 unwritten extents if not allocated, split the unwritten 697 extent if blocks has been preallocated already*/ 698 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 699 #define EXT4_GET_BLOCKS_CONVERT 0x0010 700 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 701 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 702 /* Convert extent to initialized after IO complete */ 703 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 704 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 705 /* Eventual metadata allocation (due to growing extent tree) 706 * should not fail, so try to use reserved blocks for that.*/ 707 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 708 /* Don't normalize allocation size (used for fallocate) */ 709 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 710 /* Convert written extents to unwritten */ 711 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 712 /* Write zeros to newly created written extents */ 713 #define EXT4_GET_BLOCKS_ZERO 0x0200 714 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 715 EXT4_GET_BLOCKS_ZERO) 716 /* Caller will submit data before dropping transaction handle. This 717 * allows jbd2 to avoid submitting data before commit. */ 718 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 719 /* Caller is in the atomic contex, find extent if it has been cached */ 720 #define EXT4_GET_BLOCKS_CACHED_NOWAIT 0x0800 721 722 /* 723 * The bit position of these flags must not overlap with any of the 724 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 725 * read_extent_tree_block(), ext4_split_extent_at(), 726 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 727 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 728 * caching the extents when reading from the extent tree while a 729 * truncate or punch hole operation is in progress. 730 */ 731 #define EXT4_EX_NOCACHE 0x40000000 732 #define EXT4_EX_FORCE_CACHE 0x20000000 733 #define EXT4_EX_NOFAIL 0x10000000 734 735 /* 736 * Flags used by ext4_free_blocks 737 */ 738 #define EXT4_FREE_BLOCKS_METADATA 0x0001 739 #define EXT4_FREE_BLOCKS_FORGET 0x0002 740 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 741 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 742 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 743 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 744 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040 745 746 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 747 /* 748 * ioctl commands in 32 bit emulation 749 */ 750 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 751 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 752 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 753 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 754 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 755 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 756 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 757 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 758 #endif 759 760 /* Max physical block we can address w/o extents */ 761 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 762 763 /* Max logical block we can support */ 764 #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE 765 766 /* 767 * Structure of an inode on the disk 768 */ 769 struct ext4_inode { 770 __le16 i_mode; /* File mode */ 771 __le16 i_uid; /* Low 16 bits of Owner Uid */ 772 __le32 i_size_lo; /* Size in bytes */ 773 __le32 i_atime; /* Access time */ 774 __le32 i_ctime; /* Inode Change time */ 775 __le32 i_mtime; /* Modification time */ 776 __le32 i_dtime; /* Deletion Time */ 777 __le16 i_gid; /* Low 16 bits of Group Id */ 778 __le16 i_links_count; /* Links count */ 779 __le32 i_blocks_lo; /* Blocks count */ 780 __le32 i_flags; /* File flags */ 781 union { 782 struct { 783 __le32 l_i_version; 784 } linux1; 785 struct { 786 __u32 h_i_translator; 787 } hurd1; 788 struct { 789 __u32 m_i_reserved1; 790 } masix1; 791 } osd1; /* OS dependent 1 */ 792 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 793 __le32 i_generation; /* File version (for NFS) */ 794 __le32 i_file_acl_lo; /* File ACL */ 795 __le32 i_size_high; 796 __le32 i_obso_faddr; /* Obsoleted fragment address */ 797 union { 798 struct { 799 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 800 __le16 l_i_file_acl_high; 801 __le16 l_i_uid_high; /* these 2 fields */ 802 __le16 l_i_gid_high; /* were reserved2[0] */ 803 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 804 __le16 l_i_reserved; 805 } linux2; 806 struct { 807 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 808 __u16 h_i_mode_high; 809 __u16 h_i_uid_high; 810 __u16 h_i_gid_high; 811 __u32 h_i_author; 812 } hurd2; 813 struct { 814 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 815 __le16 m_i_file_acl_high; 816 __u32 m_i_reserved2[2]; 817 } masix2; 818 } osd2; /* OS dependent 2 */ 819 __le16 i_extra_isize; 820 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 821 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 822 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 823 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 824 __le32 i_crtime; /* File Creation time */ 825 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 826 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 827 __le32 i_projid; /* Project ID */ 828 }; 829 830 #define EXT4_EPOCH_BITS 2 831 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 832 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 833 834 /* 835 * Extended fields will fit into an inode if the filesystem was formatted 836 * with large inodes (-I 256 or larger) and there are not currently any EAs 837 * consuming all of the available space. For new inodes we always reserve 838 * enough space for the kernel's known extended fields, but for inodes 839 * created with an old kernel this might not have been the case. None of 840 * the extended inode fields is critical for correct filesystem operation. 841 * This macro checks if a certain field fits in the inode. Note that 842 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 843 */ 844 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 845 ((offsetof(typeof(*ext4_inode), field) + \ 846 sizeof((ext4_inode)->field)) \ 847 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 848 (einode)->i_extra_isize)) \ 849 850 /* 851 * We use an encoding that preserves the times for extra epoch "00": 852 * 853 * extra msb of adjust for signed 854 * epoch 32-bit 32-bit tv_sec to 855 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 856 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 857 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 858 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 859 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 860 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 861 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 862 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 863 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 864 * 865 * Note that previous versions of the kernel on 64-bit systems would 866 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 867 * 1970. e2fsck will correct this, assuming that it is run on the 868 * affected filesystem before 2242. 869 */ 870 871 static inline __le32 ext4_encode_extra_time(struct timespec64 *time) 872 { 873 u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK; 874 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); 875 } 876 877 static inline void ext4_decode_extra_time(struct timespec64 *time, 878 __le32 extra) 879 { 880 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) 881 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 882 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 883 } 884 885 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 886 do { \ 887 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\ 888 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 889 (raw_inode)->xtime ## _extra = \ 890 ext4_encode_extra_time(&(inode)->xtime); \ 891 } \ 892 else \ 893 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX)); \ 894 } while (0) 895 896 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 897 do { \ 898 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 899 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 900 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 901 (raw_inode)->xtime ## _extra = \ 902 ext4_encode_extra_time(&(einode)->xtime); \ 903 } while (0) 904 905 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 906 do { \ 907 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 908 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \ 909 ext4_decode_extra_time(&(inode)->xtime, \ 910 raw_inode->xtime ## _extra); \ 911 } \ 912 else \ 913 (inode)->xtime.tv_nsec = 0; \ 914 } while (0) 915 916 917 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 918 do { \ 919 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 920 (einode)->xtime.tv_sec = \ 921 (signed)le32_to_cpu((raw_inode)->xtime); \ 922 else \ 923 (einode)->xtime.tv_sec = 0; \ 924 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 925 ext4_decode_extra_time(&(einode)->xtime, \ 926 raw_inode->xtime ## _extra); \ 927 else \ 928 (einode)->xtime.tv_nsec = 0; \ 929 } while (0) 930 931 #define i_disk_version osd1.linux1.l_i_version 932 933 #if defined(__KERNEL__) || defined(__linux__) 934 #define i_reserved1 osd1.linux1.l_i_reserved1 935 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 936 #define i_blocks_high osd2.linux2.l_i_blocks_high 937 #define i_uid_low i_uid 938 #define i_gid_low i_gid 939 #define i_uid_high osd2.linux2.l_i_uid_high 940 #define i_gid_high osd2.linux2.l_i_gid_high 941 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 942 943 #elif defined(__GNU__) 944 945 #define i_translator osd1.hurd1.h_i_translator 946 #define i_uid_high osd2.hurd2.h_i_uid_high 947 #define i_gid_high osd2.hurd2.h_i_gid_high 948 #define i_author osd2.hurd2.h_i_author 949 950 #elif defined(__masix__) 951 952 #define i_reserved1 osd1.masix1.m_i_reserved1 953 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 954 #define i_reserved2 osd2.masix2.m_i_reserved2 955 956 #endif /* defined(__KERNEL__) || defined(__linux__) */ 957 958 #include "extents_status.h" 959 #include "fast_commit.h" 960 961 /* 962 * Lock subclasses for i_data_sem in the ext4_inode_info structure. 963 * 964 * These are needed to avoid lockdep false positives when we need to 965 * allocate blocks to the quota inode during ext4_map_blocks(), while 966 * holding i_data_sem for a normal (non-quota) inode. Since we don't 967 * do quota tracking for the quota inode, this avoids deadlock (as 968 * well as infinite recursion, since it isn't turtles all the way 969 * down...) 970 * 971 * I_DATA_SEM_NORMAL - Used for most inodes 972 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode 973 * where the second inode has larger inode number 974 * than the first 975 * I_DATA_SEM_QUOTA - Used for quota inodes only 976 * I_DATA_SEM_EA - Used for ea_inodes only 977 */ 978 enum { 979 I_DATA_SEM_NORMAL = 0, 980 I_DATA_SEM_OTHER, 981 I_DATA_SEM_QUOTA, 982 I_DATA_SEM_EA 983 }; 984 985 986 /* 987 * fourth extended file system inode data in memory 988 */ 989 struct ext4_inode_info { 990 __le32 i_data[15]; /* unconverted */ 991 __u32 i_dtime; 992 ext4_fsblk_t i_file_acl; 993 994 /* 995 * i_block_group is the number of the block group which contains 996 * this file's inode. Constant across the lifetime of the inode, 997 * it is used for making block allocation decisions - we try to 998 * place a file's data blocks near its inode block, and new inodes 999 * near to their parent directory's inode. 1000 */ 1001 ext4_group_t i_block_group; 1002 ext4_lblk_t i_dir_start_lookup; 1003 #if (BITS_PER_LONG < 64) 1004 unsigned long i_state_flags; /* Dynamic state flags */ 1005 #endif 1006 unsigned long i_flags; 1007 1008 /* 1009 * Extended attributes can be read independently of the main file 1010 * data. Taking i_rwsem even when reading would cause contention 1011 * between readers of EAs and writers of regular file data, so 1012 * instead we synchronize on xattr_sem when reading or changing 1013 * EAs. 1014 */ 1015 struct rw_semaphore xattr_sem; 1016 1017 /* 1018 * Inodes with EXT4_STATE_ORPHAN_FILE use i_orphan_idx. Otherwise 1019 * i_orphan is used. 1020 */ 1021 union { 1022 struct list_head i_orphan; /* unlinked but open inodes */ 1023 unsigned int i_orphan_idx; /* Index in orphan file */ 1024 }; 1025 1026 /* Fast commit related info */ 1027 1028 /* For tracking dentry create updates */ 1029 struct list_head i_fc_dilist; 1030 struct list_head i_fc_list; /* 1031 * inodes that need fast commit 1032 * protected by sbi->s_fc_lock. 1033 */ 1034 1035 /* Start of lblk range that needs to be committed in this fast commit */ 1036 ext4_lblk_t i_fc_lblk_start; 1037 1038 /* End of lblk range that needs to be committed in this fast commit */ 1039 ext4_lblk_t i_fc_lblk_len; 1040 1041 /* Number of ongoing updates on this inode */ 1042 atomic_t i_fc_updates; 1043 1044 /* Fast commit wait queue for this inode */ 1045 wait_queue_head_t i_fc_wait; 1046 1047 /* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */ 1048 struct mutex i_fc_lock; 1049 1050 /* 1051 * i_disksize keeps track of what the inode size is ON DISK, not 1052 * in memory. During truncate, i_size is set to the new size by 1053 * the VFS prior to calling ext4_truncate(), but the filesystem won't 1054 * set i_disksize to 0 until the truncate is actually under way. 1055 * 1056 * The intent is that i_disksize always represents the blocks which 1057 * are used by this file. This allows recovery to restart truncate 1058 * on orphans if we crash during truncate. We actually write i_disksize 1059 * into the on-disk inode when writing inodes out, instead of i_size. 1060 * 1061 * The only time when i_disksize and i_size may be different is when 1062 * a truncate is in progress. The only things which change i_disksize 1063 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 1064 */ 1065 loff_t i_disksize; 1066 1067 /* 1068 * i_data_sem is for serialising ext4_truncate() against 1069 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 1070 * data tree are chopped off during truncate. We can't do that in 1071 * ext4 because whenever we perform intermediate commits during 1072 * truncate, the inode and all the metadata blocks *must* be in a 1073 * consistent state which allows truncation of the orphans to restart 1074 * during recovery. Hence we must fix the get_block-vs-truncate race 1075 * by other means, so we have i_data_sem. 1076 */ 1077 struct rw_semaphore i_data_sem; 1078 struct inode vfs_inode; 1079 struct jbd2_inode *jinode; 1080 1081 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 1082 1083 /* 1084 * File creation time. Its function is same as that of 1085 * struct timespec64 i_{a,c,m}time in the generic inode. 1086 */ 1087 struct timespec64 i_crtime; 1088 1089 /* mballoc */ 1090 atomic_t i_prealloc_active; 1091 struct rb_root i_prealloc_node; 1092 rwlock_t i_prealloc_lock; 1093 1094 /* extents status tree */ 1095 struct ext4_es_tree i_es_tree; 1096 rwlock_t i_es_lock; 1097 struct list_head i_es_list; 1098 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1099 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1100 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1101 extents to shrink. Protected by 1102 i_es_lock */ 1103 1104 /* ialloc */ 1105 ext4_group_t i_last_alloc_group; 1106 1107 /* allocation reservation info for delalloc */ 1108 /* In case of bigalloc, this refer to clusters rather than blocks */ 1109 unsigned int i_reserved_data_blocks; 1110 1111 /* pending cluster reservations for bigalloc file systems */ 1112 struct ext4_pending_tree i_pending_tree; 1113 1114 /* on-disk additional length */ 1115 __u16 i_extra_isize; 1116 1117 /* Indicate the inline data space. */ 1118 u16 i_inline_off; 1119 u16 i_inline_size; 1120 1121 #ifdef CONFIG_QUOTA 1122 /* quota space reservation, managed internally by quota code */ 1123 qsize_t i_reserved_quota; 1124 #endif 1125 1126 /* Lock protecting lists below */ 1127 spinlock_t i_completed_io_lock; 1128 /* 1129 * Completed IOs that need unwritten extents handling and have 1130 * transaction reserved 1131 */ 1132 struct list_head i_rsv_conversion_list; 1133 struct work_struct i_rsv_conversion_work; 1134 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 1135 1136 spinlock_t i_block_reservation_lock; 1137 1138 /* 1139 * Transactions that contain inode's metadata needed to complete 1140 * fsync and fdatasync, respectively. 1141 */ 1142 tid_t i_sync_tid; 1143 tid_t i_datasync_tid; 1144 1145 #ifdef CONFIG_QUOTA 1146 struct dquot *i_dquot[MAXQUOTAS]; 1147 #endif 1148 1149 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1150 __u32 i_csum_seed; 1151 1152 kprojid_t i_projid; 1153 }; 1154 1155 /* 1156 * File system states 1157 */ 1158 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1159 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1160 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1161 #define EXT4_FC_REPLAY 0x0020 /* Fast commit replay ongoing */ 1162 1163 /* 1164 * Misc. filesystem flags 1165 */ 1166 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1167 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1168 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1169 1170 /* 1171 * Mount flags set via mount options or defaults 1172 */ 1173 #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */ 1174 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1175 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1176 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1177 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1178 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1179 #define EXT4_MOUNT_ERRORS_MASK 0x00070 1180 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1181 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1182 #ifdef CONFIG_FS_DAX 1183 #define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */ 1184 #else 1185 #define EXT4_MOUNT_DAX_ALWAYS 0 1186 #endif 1187 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1188 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1189 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1190 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1191 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1192 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1193 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1194 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1195 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1196 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1197 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */ 1198 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota, 1199 * enable enforcement for hidden 1200 * quota files */ 1201 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable 1202 * enforcement for hidden quota 1203 * files */ 1204 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota 1205 * enforcement */ 1206 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1207 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1208 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1209 #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */ 1210 #define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000 1211 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1212 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1213 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1214 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1215 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1216 1217 /* 1218 * Mount flags set either automatically (could not be set by mount option) 1219 * based on per file system feature or property or in special cases such as 1220 * distinguishing between explicit mount option definition and default. 1221 */ 1222 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1223 specified delalloc */ 1224 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1225 size of blocksize * 8 1226 blocks */ 1227 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1228 file systems */ 1229 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1230 specified journal checksum */ 1231 1232 #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */ 1233 #define EXT4_MOUNT2_DAX_NEVER 0x00000020 /* Do not allow Direct Access */ 1234 #define EXT4_MOUNT2_DAX_INODE 0x00000040 /* For printing options only */ 1235 #define EXT4_MOUNT2_MB_OPTIMIZE_SCAN 0x00000080 /* Optimize group 1236 * scanning in mballoc 1237 */ 1238 1239 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1240 ~EXT4_MOUNT_##opt 1241 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1242 EXT4_MOUNT_##opt 1243 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1244 EXT4_MOUNT_##opt) 1245 1246 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1247 ~EXT4_MOUNT2_##opt 1248 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1249 EXT4_MOUNT2_##opt 1250 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1251 EXT4_MOUNT2_##opt) 1252 1253 #define ext4_test_and_set_bit __test_and_set_bit_le 1254 #define ext4_set_bit __set_bit_le 1255 #define ext4_set_bit_atomic ext2_set_bit_atomic 1256 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1257 #define ext4_clear_bit __clear_bit_le 1258 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1259 #define ext4_test_bit test_bit_le 1260 #define ext4_find_next_zero_bit find_next_zero_bit_le 1261 #define ext4_find_next_bit find_next_bit_le 1262 1263 extern void mb_set_bits(void *bm, int cur, int len); 1264 1265 /* 1266 * Maximal mount counts between two filesystem checks 1267 */ 1268 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1269 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1270 1271 /* 1272 * Behaviour when detecting errors 1273 */ 1274 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1275 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1276 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1277 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1278 1279 /* Metadata checksum algorithm codes */ 1280 #define EXT4_CRC32C_CHKSUM 1 1281 1282 #define EXT4_LABEL_MAX 16 1283 1284 /* 1285 * Structure of the super block 1286 */ 1287 struct ext4_super_block { 1288 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1289 __le32 s_blocks_count_lo; /* Blocks count */ 1290 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1291 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1292 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1293 __le32 s_first_data_block; /* First Data Block */ 1294 __le32 s_log_block_size; /* Block size */ 1295 __le32 s_log_cluster_size; /* Allocation cluster size */ 1296 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1297 __le32 s_clusters_per_group; /* # Clusters per group */ 1298 __le32 s_inodes_per_group; /* # Inodes per group */ 1299 __le32 s_mtime; /* Mount time */ 1300 /*30*/ __le32 s_wtime; /* Write time */ 1301 __le16 s_mnt_count; /* Mount count */ 1302 __le16 s_max_mnt_count; /* Maximal mount count */ 1303 __le16 s_magic; /* Magic signature */ 1304 __le16 s_state; /* File system state */ 1305 __le16 s_errors; /* Behaviour when detecting errors */ 1306 __le16 s_minor_rev_level; /* minor revision level */ 1307 /*40*/ __le32 s_lastcheck; /* time of last check */ 1308 __le32 s_checkinterval; /* max. time between checks */ 1309 __le32 s_creator_os; /* OS */ 1310 __le32 s_rev_level; /* Revision level */ 1311 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1312 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1313 /* 1314 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1315 * 1316 * Note: the difference between the compatible feature set and 1317 * the incompatible feature set is that if there is a bit set 1318 * in the incompatible feature set that the kernel doesn't 1319 * know about, it should refuse to mount the filesystem. 1320 * 1321 * e2fsck's requirements are more strict; if it doesn't know 1322 * about a feature in either the compatible or incompatible 1323 * feature set, it must abort and not try to meddle with 1324 * things it doesn't understand... 1325 */ 1326 __le32 s_first_ino; /* First non-reserved inode */ 1327 __le16 s_inode_size; /* size of inode structure */ 1328 __le16 s_block_group_nr; /* block group # of this superblock */ 1329 __le32 s_feature_compat; /* compatible feature set */ 1330 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1331 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1332 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1333 /*78*/ char s_volume_name[EXT4_LABEL_MAX]; /* volume name */ 1334 /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */ 1335 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1336 /* 1337 * Performance hints. Directory preallocation should only 1338 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1339 */ 1340 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1341 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1342 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1343 /* 1344 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1345 */ 1346 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1347 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1348 __le32 s_journal_dev; /* device number of journal file */ 1349 __le32 s_last_orphan; /* start of list of inodes to delete */ 1350 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1351 __u8 s_def_hash_version; /* Default hash version to use */ 1352 __u8 s_jnl_backup_type; 1353 __le16 s_desc_size; /* size of group descriptor */ 1354 /*100*/ __le32 s_default_mount_opts; 1355 __le32 s_first_meta_bg; /* First metablock block group */ 1356 __le32 s_mkfs_time; /* When the filesystem was created */ 1357 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1358 /* 64bit support valid if EXT4_FEATURE_INCOMPAT_64BIT */ 1359 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1360 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1361 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1362 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1363 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1364 __le32 s_flags; /* Miscellaneous flags */ 1365 __le16 s_raid_stride; /* RAID stride */ 1366 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1367 __le64 s_mmp_block; /* Block for multi-mount protection */ 1368 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1369 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1370 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1371 __u8 s_encryption_level; /* versioning level for encryption */ 1372 __u8 s_reserved_pad; /* Padding to next 32bits */ 1373 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1374 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1375 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1376 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1377 snapshot's future use */ 1378 __le32 s_snapshot_list; /* inode number of the head of the 1379 on-disk snapshot list */ 1380 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1381 __le32 s_error_count; /* number of fs errors */ 1382 __le32 s_first_error_time; /* first time an error happened */ 1383 __le32 s_first_error_ino; /* inode involved in first error */ 1384 __le64 s_first_error_block; /* block involved of first error */ 1385 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */ 1386 __le32 s_first_error_line; /* line number where error happened */ 1387 __le32 s_last_error_time; /* most recent time of an error */ 1388 __le32 s_last_error_ino; /* inode involved in last error */ 1389 __le32 s_last_error_line; /* line number where error happened */ 1390 __le64 s_last_error_block; /* block involved of last error */ 1391 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */ 1392 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1393 __u8 s_mount_opts[64]; 1394 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1395 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1396 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1397 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1398 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1399 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1400 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1401 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1402 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1403 __u8 s_wtime_hi; 1404 __u8 s_mtime_hi; 1405 __u8 s_mkfs_time_hi; 1406 __u8 s_lastcheck_hi; 1407 __u8 s_first_error_time_hi; 1408 __u8 s_last_error_time_hi; 1409 __u8 s_first_error_errcode; 1410 __u8 s_last_error_errcode; 1411 __le16 s_encoding; /* Filename charset encoding */ 1412 __le16 s_encoding_flags; /* Filename charset encoding flags */ 1413 __le32 s_orphan_file_inum; /* Inode for tracking orphan inodes */ 1414 __le32 s_reserved[94]; /* Padding to the end of the block */ 1415 __le32 s_checksum; /* crc32c(superblock) */ 1416 }; 1417 1418 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1419 1420 #ifdef __KERNEL__ 1421 1422 /* Number of quota types we support */ 1423 #define EXT4_MAXQUOTAS 3 1424 1425 #define EXT4_ENC_UTF8_12_1 1 1426 1427 /* Types of ext4 journal triggers */ 1428 enum ext4_journal_trigger_type { 1429 EXT4_JTR_ORPHAN_FILE, 1430 EXT4_JTR_NONE /* This must be the last entry for indexing to work! */ 1431 }; 1432 1433 #define EXT4_JOURNAL_TRIGGER_COUNT EXT4_JTR_NONE 1434 1435 struct ext4_journal_trigger { 1436 struct jbd2_buffer_trigger_type tr_triggers; 1437 struct super_block *sb; 1438 }; 1439 1440 static inline struct ext4_journal_trigger *EXT4_TRIGGER( 1441 struct jbd2_buffer_trigger_type *trigger) 1442 { 1443 return container_of(trigger, struct ext4_journal_trigger, tr_triggers); 1444 } 1445 1446 #define EXT4_ORPHAN_BLOCK_MAGIC 0x0b10ca04 1447 1448 /* Structure at the tail of orphan block */ 1449 struct ext4_orphan_block_tail { 1450 __le32 ob_magic; 1451 __le32 ob_checksum; 1452 }; 1453 1454 static inline int ext4_inodes_per_orphan_block(struct super_block *sb) 1455 { 1456 return (sb->s_blocksize - sizeof(struct ext4_orphan_block_tail)) / 1457 sizeof(u32); 1458 } 1459 1460 struct ext4_orphan_block { 1461 atomic_t ob_free_entries; /* Number of free orphan entries in block */ 1462 struct buffer_head *ob_bh; /* Buffer for orphan block */ 1463 }; 1464 1465 /* 1466 * Info about orphan file. 1467 */ 1468 struct ext4_orphan_info { 1469 int of_blocks; /* Number of orphan blocks in a file */ 1470 __u32 of_csum_seed; /* Checksum seed for orphan file */ 1471 struct ext4_orphan_block *of_binfo; /* Array with info about orphan 1472 * file blocks */ 1473 }; 1474 1475 /* 1476 * fourth extended-fs super-block data in memory 1477 */ 1478 struct ext4_sb_info { 1479 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1480 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1481 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1482 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1483 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1484 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1485 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1486 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1487 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1488 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1489 unsigned long s_overhead; /* # of fs overhead clusters */ 1490 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1491 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1492 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1493 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1494 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1495 struct buffer_head * __rcu *s_group_desc; 1496 unsigned int s_mount_opt; 1497 unsigned int s_mount_opt2; 1498 unsigned long s_mount_flags; 1499 unsigned int s_def_mount_opt; 1500 unsigned int s_def_mount_opt2; 1501 ext4_fsblk_t s_sb_block; 1502 atomic64_t s_resv_clusters; 1503 kuid_t s_resuid; 1504 kgid_t s_resgid; 1505 unsigned short s_mount_state; 1506 unsigned short s_pad; 1507 int s_addr_per_block_bits; 1508 int s_desc_per_block_bits; 1509 int s_inode_size; 1510 int s_first_ino; 1511 unsigned int s_inode_readahead_blks; 1512 unsigned int s_inode_goal; 1513 u32 s_hash_seed[4]; 1514 int s_def_hash_version; 1515 int s_hash_unsigned; /* 3 if hash should be unsigned, 0 if not */ 1516 struct percpu_counter s_freeclusters_counter; 1517 struct percpu_counter s_freeinodes_counter; 1518 struct percpu_counter s_dirs_counter; 1519 struct percpu_counter s_dirtyclusters_counter; 1520 struct percpu_counter s_sra_exceeded_retry_limit; 1521 struct blockgroup_lock *s_blockgroup_lock; 1522 struct proc_dir_entry *s_proc; 1523 struct kobject s_kobj; 1524 struct completion s_kobj_unregister; 1525 struct super_block *s_sb; 1526 struct buffer_head *s_mmp_bh; 1527 1528 /* Journaling */ 1529 struct journal_s *s_journal; 1530 unsigned long s_ext4_flags; /* Ext4 superblock flags */ 1531 struct mutex s_orphan_lock; /* Protects on disk list changes */ 1532 struct list_head s_orphan; /* List of orphaned inodes in on disk 1533 list */ 1534 struct ext4_orphan_info s_orphan_info; 1535 unsigned long s_commit_interval; 1536 u32 s_max_batch_time; 1537 u32 s_min_batch_time; 1538 struct block_device *s_journal_bdev; 1539 #ifdef CONFIG_QUOTA 1540 /* Names of quota files with journalled quota */ 1541 char __rcu *s_qf_names[EXT4_MAXQUOTAS]; 1542 int s_jquota_fmt; /* Format of quota to use */ 1543 #endif 1544 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1545 struct ext4_system_blocks __rcu *s_system_blks; 1546 1547 #ifdef EXTENTS_STATS 1548 /* ext4 extents stats */ 1549 unsigned long s_ext_min; 1550 unsigned long s_ext_max; 1551 unsigned long s_depth_max; 1552 spinlock_t s_ext_stats_lock; 1553 unsigned long s_ext_blocks; 1554 unsigned long s_ext_extents; 1555 #endif 1556 1557 /* for buddy allocator */ 1558 struct ext4_group_info ** __rcu *s_group_info; 1559 struct inode *s_buddy_cache; 1560 spinlock_t s_md_lock; 1561 unsigned short *s_mb_offsets; 1562 unsigned int *s_mb_maxs; 1563 unsigned int s_group_info_size; 1564 unsigned int s_mb_free_pending; 1565 struct list_head s_freed_data_list; /* List of blocks to be freed 1566 after commit completed */ 1567 struct list_head s_discard_list; 1568 struct work_struct s_discard_work; 1569 atomic_t s_retry_alloc_pending; 1570 struct list_head *s_mb_avg_fragment_size; 1571 rwlock_t *s_mb_avg_fragment_size_locks; 1572 struct list_head *s_mb_largest_free_orders; 1573 rwlock_t *s_mb_largest_free_orders_locks; 1574 1575 /* tunables */ 1576 unsigned long s_stripe; 1577 unsigned int s_mb_max_linear_groups; 1578 unsigned int s_mb_stream_request; 1579 unsigned int s_mb_max_to_scan; 1580 unsigned int s_mb_min_to_scan; 1581 unsigned int s_mb_stats; 1582 unsigned int s_mb_order2_reqs; 1583 unsigned int s_mb_group_prealloc; 1584 unsigned int s_max_dir_size_kb; 1585 /* where last allocation was done - for stream allocation */ 1586 unsigned long s_mb_last_group; 1587 unsigned long s_mb_last_start; 1588 unsigned int s_mb_prefetch; 1589 unsigned int s_mb_prefetch_limit; 1590 unsigned int s_mb_best_avail_max_trim_order; 1591 1592 /* stats for buddy allocator */ 1593 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1594 atomic_t s_bal_success; /* we found long enough chunks */ 1595 atomic_t s_bal_allocated; /* in blocks */ 1596 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1597 atomic_t s_bal_cX_ex_scanned[EXT4_MB_NUM_CRS]; /* total extents scanned */ 1598 atomic_t s_bal_groups_scanned; /* number of groups scanned */ 1599 atomic_t s_bal_goals; /* goal hits */ 1600 atomic_t s_bal_len_goals; /* len goal hits */ 1601 atomic_t s_bal_breaks; /* too long searches */ 1602 atomic_t s_bal_2orders; /* 2^order hits */ 1603 atomic_t s_bal_p2_aligned_bad_suggestions; 1604 atomic_t s_bal_goal_fast_bad_suggestions; 1605 atomic_t s_bal_best_avail_bad_suggestions; 1606 atomic64_t s_bal_cX_groups_considered[EXT4_MB_NUM_CRS]; 1607 atomic64_t s_bal_cX_hits[EXT4_MB_NUM_CRS]; 1608 atomic64_t s_bal_cX_failed[EXT4_MB_NUM_CRS]; /* cX loop didn't find blocks */ 1609 atomic_t s_mb_buddies_generated; /* number of buddies generated */ 1610 atomic64_t s_mb_generation_time; 1611 atomic_t s_mb_lost_chunks; 1612 atomic_t s_mb_preallocated; 1613 atomic_t s_mb_discarded; 1614 atomic_t s_lock_busy; 1615 1616 /* locality groups */ 1617 struct ext4_locality_group __percpu *s_locality_groups; 1618 1619 /* for write statistics */ 1620 unsigned long s_sectors_written_start; 1621 u64 s_kbytes_written; 1622 1623 /* the size of zero-out chunk */ 1624 unsigned int s_extent_max_zeroout_kb; 1625 1626 unsigned int s_log_groups_per_flex; 1627 struct flex_groups * __rcu *s_flex_groups; 1628 ext4_group_t s_flex_groups_allocated; 1629 1630 /* workqueue for reserved extent conversions (buffered io) */ 1631 struct workqueue_struct *rsv_conversion_wq; 1632 1633 /* timer for periodic error stats printing */ 1634 struct timer_list s_err_report; 1635 1636 /* Lazy inode table initialization info */ 1637 struct ext4_li_request *s_li_request; 1638 /* Wait multiplier for lazy initialization thread */ 1639 unsigned int s_li_wait_mult; 1640 1641 /* Kernel thread for multiple mount protection */ 1642 struct task_struct *s_mmp_tsk; 1643 1644 /* record the last minlen when FITRIM is called. */ 1645 unsigned long s_last_trim_minblks; 1646 1647 /* Reference to checksum algorithm driver via cryptoapi */ 1648 struct crypto_shash *s_chksum_driver; 1649 1650 /* Precomputed FS UUID checksum for seeding other checksums */ 1651 __u32 s_csum_seed; 1652 1653 /* Reclaim extents from extent status tree */ 1654 struct shrinker s_es_shrinker; 1655 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1656 long s_es_nr_inode; 1657 struct ext4_es_stats s_es_stats; 1658 struct mb_cache *s_ea_block_cache; 1659 struct mb_cache *s_ea_inode_cache; 1660 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1661 1662 /* Journal triggers for checksum computation */ 1663 struct ext4_journal_trigger s_journal_triggers[EXT4_JOURNAL_TRIGGER_COUNT]; 1664 1665 /* Ratelimit ext4 messages. */ 1666 struct ratelimit_state s_err_ratelimit_state; 1667 struct ratelimit_state s_warning_ratelimit_state; 1668 struct ratelimit_state s_msg_ratelimit_state; 1669 atomic_t s_warning_count; 1670 atomic_t s_msg_count; 1671 1672 /* Encryption policy for '-o test_dummy_encryption' */ 1673 struct fscrypt_dummy_policy s_dummy_enc_policy; 1674 1675 /* 1676 * Barrier between writepages ops and changing any inode's JOURNAL_DATA 1677 * or EXTENTS flag. 1678 */ 1679 struct percpu_rw_semaphore s_writepages_rwsem; 1680 struct dax_device *s_daxdev; 1681 u64 s_dax_part_off; 1682 #ifdef CONFIG_EXT4_DEBUG 1683 unsigned long s_simulate_fail; 1684 #endif 1685 /* Record the errseq of the backing block device */ 1686 errseq_t s_bdev_wb_err; 1687 spinlock_t s_bdev_wb_lock; 1688 1689 /* Information about errors that happened during this mount */ 1690 spinlock_t s_error_lock; 1691 int s_add_error_count; 1692 int s_first_error_code; 1693 __u32 s_first_error_line; 1694 __u32 s_first_error_ino; 1695 __u64 s_first_error_block; 1696 const char *s_first_error_func; 1697 time64_t s_first_error_time; 1698 int s_last_error_code; 1699 __u32 s_last_error_line; 1700 __u32 s_last_error_ino; 1701 __u64 s_last_error_block; 1702 const char *s_last_error_func; 1703 time64_t s_last_error_time; 1704 /* 1705 * If we are in a context where we cannot update error information in 1706 * the on-disk superblock, we queue this work to do it. 1707 */ 1708 struct work_struct s_error_work; 1709 1710 /* Ext4 fast commit sub transaction ID */ 1711 atomic_t s_fc_subtid; 1712 1713 /* 1714 * After commit starts, the main queue gets locked, and the further 1715 * updates get added in the staging queue. 1716 */ 1717 #define FC_Q_MAIN 0 1718 #define FC_Q_STAGING 1 1719 struct list_head s_fc_q[2]; /* Inodes staged for fast commit 1720 * that have data changes in them. 1721 */ 1722 struct list_head s_fc_dentry_q[2]; /* directory entry updates */ 1723 unsigned int s_fc_bytes; 1724 /* 1725 * Main fast commit lock. This lock protects accesses to the 1726 * following fields: 1727 * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh. 1728 */ 1729 spinlock_t s_fc_lock; 1730 struct buffer_head *s_fc_bh; 1731 struct ext4_fc_stats s_fc_stats; 1732 tid_t s_fc_ineligible_tid; 1733 #ifdef CONFIG_EXT4_DEBUG 1734 int s_fc_debug_max_replay; 1735 #endif 1736 struct ext4_fc_replay_state s_fc_replay_state; 1737 }; 1738 1739 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1740 { 1741 return sb->s_fs_info; 1742 } 1743 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1744 { 1745 return container_of(inode, struct ext4_inode_info, vfs_inode); 1746 } 1747 1748 static inline int ext4_writepages_down_read(struct super_block *sb) 1749 { 1750 percpu_down_read(&EXT4_SB(sb)->s_writepages_rwsem); 1751 return memalloc_nofs_save(); 1752 } 1753 1754 static inline void ext4_writepages_up_read(struct super_block *sb, int ctx) 1755 { 1756 memalloc_nofs_restore(ctx); 1757 percpu_up_read(&EXT4_SB(sb)->s_writepages_rwsem); 1758 } 1759 1760 static inline int ext4_writepages_down_write(struct super_block *sb) 1761 { 1762 percpu_down_write(&EXT4_SB(sb)->s_writepages_rwsem); 1763 return memalloc_nofs_save(); 1764 } 1765 1766 static inline void ext4_writepages_up_write(struct super_block *sb, int ctx) 1767 { 1768 memalloc_nofs_restore(ctx); 1769 percpu_up_write(&EXT4_SB(sb)->s_writepages_rwsem); 1770 } 1771 1772 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1773 { 1774 return ino == EXT4_ROOT_INO || 1775 (ino >= EXT4_FIRST_INO(sb) && 1776 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1777 } 1778 1779 /* 1780 * Returns: sbi->field[index] 1781 * Used to access an array element from the following sbi fields which require 1782 * rcu protection to avoid dereferencing an invalid pointer due to reassignment 1783 * - s_group_desc 1784 * - s_group_info 1785 * - s_flex_group 1786 */ 1787 #define sbi_array_rcu_deref(sbi, field, index) \ 1788 ({ \ 1789 typeof(*((sbi)->field)) _v; \ 1790 rcu_read_lock(); \ 1791 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \ 1792 rcu_read_unlock(); \ 1793 _v; \ 1794 }) 1795 1796 /* 1797 * run-time mount flags 1798 */ 1799 enum { 1800 EXT4_MF_MNTDIR_SAMPLED, 1801 EXT4_MF_FS_ABORTED, /* Fatal error detected */ 1802 EXT4_MF_FC_INELIGIBLE /* Fast commit ineligible */ 1803 }; 1804 1805 static inline void ext4_set_mount_flag(struct super_block *sb, int bit) 1806 { 1807 set_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1808 } 1809 1810 static inline void ext4_clear_mount_flag(struct super_block *sb, int bit) 1811 { 1812 clear_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1813 } 1814 1815 static inline int ext4_test_mount_flag(struct super_block *sb, int bit) 1816 { 1817 return test_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1818 } 1819 1820 1821 /* 1822 * Simulate_fail codes 1823 */ 1824 #define EXT4_SIM_BBITMAP_EIO 1 1825 #define EXT4_SIM_BBITMAP_CRC 2 1826 #define EXT4_SIM_IBITMAP_EIO 3 1827 #define EXT4_SIM_IBITMAP_CRC 4 1828 #define EXT4_SIM_INODE_EIO 5 1829 #define EXT4_SIM_INODE_CRC 6 1830 #define EXT4_SIM_DIRBLOCK_EIO 7 1831 #define EXT4_SIM_DIRBLOCK_CRC 8 1832 1833 static inline bool ext4_simulate_fail(struct super_block *sb, 1834 unsigned long code) 1835 { 1836 #ifdef CONFIG_EXT4_DEBUG 1837 struct ext4_sb_info *sbi = EXT4_SB(sb); 1838 1839 if (unlikely(sbi->s_simulate_fail == code)) { 1840 sbi->s_simulate_fail = 0; 1841 return true; 1842 } 1843 #endif 1844 return false; 1845 } 1846 1847 static inline void ext4_simulate_fail_bh(struct super_block *sb, 1848 struct buffer_head *bh, 1849 unsigned long code) 1850 { 1851 if (!IS_ERR(bh) && ext4_simulate_fail(sb, code)) 1852 clear_buffer_uptodate(bh); 1853 } 1854 1855 /* 1856 * Error number codes for s_{first,last}_error_errno 1857 * 1858 * Linux errno numbers are architecture specific, so we need to translate 1859 * them into something which is architecture independent. We don't define 1860 * codes for all errno's; just the ones which are most likely to be the cause 1861 * of an ext4_error() call. 1862 */ 1863 #define EXT4_ERR_UNKNOWN 1 1864 #define EXT4_ERR_EIO 2 1865 #define EXT4_ERR_ENOMEM 3 1866 #define EXT4_ERR_EFSBADCRC 4 1867 #define EXT4_ERR_EFSCORRUPTED 5 1868 #define EXT4_ERR_ENOSPC 6 1869 #define EXT4_ERR_ENOKEY 7 1870 #define EXT4_ERR_EROFS 8 1871 #define EXT4_ERR_EFBIG 9 1872 #define EXT4_ERR_EEXIST 10 1873 #define EXT4_ERR_ERANGE 11 1874 #define EXT4_ERR_EOVERFLOW 12 1875 #define EXT4_ERR_EBUSY 13 1876 #define EXT4_ERR_ENOTDIR 14 1877 #define EXT4_ERR_ENOTEMPTY 15 1878 #define EXT4_ERR_ESHUTDOWN 16 1879 #define EXT4_ERR_EFAULT 17 1880 1881 /* 1882 * Inode dynamic state flags 1883 */ 1884 enum { 1885 EXT4_STATE_NEW, /* inode is newly created */ 1886 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1887 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1888 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1889 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1890 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1891 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1892 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1893 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */ 1894 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */ 1895 EXT4_STATE_FC_COMMITTING, /* Fast commit ongoing */ 1896 EXT4_STATE_ORPHAN_FILE, /* Inode orphaned in orphan file */ 1897 }; 1898 1899 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1900 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1901 { \ 1902 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1903 } \ 1904 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1905 { \ 1906 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1907 } \ 1908 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1909 { \ 1910 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1911 } 1912 1913 /* Add these declarations here only so that these functions can be 1914 * found by name. Otherwise, they are very hard to locate. */ 1915 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1916 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1917 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1918 EXT4_INODE_BIT_FNS(flag, flags, 0) 1919 1920 /* Add these declarations here only so that these functions can be 1921 * found by name. Otherwise, they are very hard to locate. */ 1922 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1923 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1924 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1925 #if (BITS_PER_LONG < 64) 1926 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1927 1928 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1929 { 1930 (ei)->i_state_flags = 0; 1931 } 1932 #else 1933 EXT4_INODE_BIT_FNS(state, flags, 32) 1934 1935 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1936 { 1937 /* We depend on the fact that callers will set i_flags */ 1938 } 1939 #endif 1940 #else 1941 /* Assume that user mode programs are passing in an ext4fs superblock, not 1942 * a kernel struct super_block. This will allow us to call the feature-test 1943 * macros from user land. */ 1944 #define EXT4_SB(sb) (sb) 1945 #endif 1946 1947 static inline bool ext4_verity_in_progress(struct inode *inode) 1948 { 1949 return IS_ENABLED(CONFIG_FS_VERITY) && 1950 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS); 1951 } 1952 1953 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1954 1955 /* 1956 * Codes for operating systems 1957 */ 1958 #define EXT4_OS_LINUX 0 1959 #define EXT4_OS_HURD 1 1960 #define EXT4_OS_MASIX 2 1961 #define EXT4_OS_FREEBSD 3 1962 #define EXT4_OS_LITES 4 1963 1964 /* 1965 * Revision levels 1966 */ 1967 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1968 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1969 1970 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1971 1972 #define EXT4_GOOD_OLD_INODE_SIZE 128 1973 1974 #define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN) 1975 #define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX 1976 #define EXT4_TIMESTAMP_MIN S32_MIN 1977 1978 /* 1979 * Feature set definitions 1980 */ 1981 1982 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1983 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1984 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1985 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1986 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1987 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1988 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1989 /* 1990 * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes 1991 * incompatible only if fast commit blocks are present in the FS. Since we 1992 * clear the journal (and thus the fast commit blocks), we don't mark FS as 1993 * incompatible. We also have a JBD2 incompat feature, which gets set when 1994 * there are fast commit blocks present in the journal. 1995 */ 1996 #define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400 1997 #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800 1998 #define EXT4_FEATURE_COMPAT_ORPHAN_FILE 0x1000 /* Orphan file exists */ 1999 2000 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 2001 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 2002 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 2003 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 2004 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 2005 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 2006 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 2007 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 2008 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 2009 /* 2010 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 2011 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 2012 * all other data structures' checksums. However, the METADATA_CSUM and 2013 * GDT_CSUM bits are mutually exclusive. 2014 */ 2015 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 2016 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 2017 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 2018 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000 2019 #define EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT 0x10000 /* Orphan file may be 2020 non-empty */ 2021 2022 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 2023 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 2024 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 2025 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 2026 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 2027 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 2028 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 2029 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 2030 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 2031 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 2032 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 2033 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 2034 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 2035 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 2036 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 2037 #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000 2038 2039 extern void ext4_update_dynamic_rev(struct super_block *sb); 2040 2041 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 2042 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 2043 { \ 2044 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 2045 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 2046 } \ 2047 static inline void ext4_set_feature_##name(struct super_block *sb) \ 2048 { \ 2049 ext4_update_dynamic_rev(sb); \ 2050 EXT4_SB(sb)->s_es->s_feature_compat |= \ 2051 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 2052 } \ 2053 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 2054 { \ 2055 EXT4_SB(sb)->s_es->s_feature_compat &= \ 2056 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 2057 } 2058 2059 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 2060 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 2061 { \ 2062 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 2063 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 2064 } \ 2065 static inline void ext4_set_feature_##name(struct super_block *sb) \ 2066 { \ 2067 ext4_update_dynamic_rev(sb); \ 2068 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 2069 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 2070 } \ 2071 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 2072 { \ 2073 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 2074 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 2075 } 2076 2077 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 2078 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 2079 { \ 2080 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 2081 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 2082 } \ 2083 static inline void ext4_set_feature_##name(struct super_block *sb) \ 2084 { \ 2085 ext4_update_dynamic_rev(sb); \ 2086 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 2087 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 2088 } \ 2089 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 2090 { \ 2091 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 2092 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 2093 } 2094 2095 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 2096 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 2097 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 2098 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 2099 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 2100 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 2101 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 2102 EXT4_FEATURE_COMPAT_FUNCS(fast_commit, FAST_COMMIT) 2103 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES) 2104 EXT4_FEATURE_COMPAT_FUNCS(orphan_file, ORPHAN_FILE) 2105 2106 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 2107 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 2108 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 2109 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 2110 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 2111 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 2112 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 2113 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 2114 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 2115 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 2116 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 2117 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 2118 EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY) 2119 EXT4_FEATURE_RO_COMPAT_FUNCS(orphan_present, ORPHAN_PRESENT) 2120 2121 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 2122 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 2123 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 2124 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 2125 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 2126 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 2127 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 2128 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 2129 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 2130 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 2131 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 2132 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 2133 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 2134 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 2135 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 2136 EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD) 2137 2138 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2139 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2140 EXT4_FEATURE_INCOMPAT_META_BG) 2141 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2142 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2143 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 2144 2145 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2146 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2147 EXT4_FEATURE_INCOMPAT_RECOVER| \ 2148 EXT4_FEATURE_INCOMPAT_META_BG) 2149 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2150 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2151 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 2152 2153 #define EXT4_FEATURE_COMPAT_SUPP (EXT4_FEATURE_COMPAT_EXT_ATTR| \ 2154 EXT4_FEATURE_COMPAT_ORPHAN_FILE) 2155 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2156 EXT4_FEATURE_INCOMPAT_RECOVER| \ 2157 EXT4_FEATURE_INCOMPAT_META_BG| \ 2158 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 2159 EXT4_FEATURE_INCOMPAT_64BIT| \ 2160 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 2161 EXT4_FEATURE_INCOMPAT_EA_INODE| \ 2162 EXT4_FEATURE_INCOMPAT_MMP | \ 2163 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 2164 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 2165 EXT4_FEATURE_INCOMPAT_CASEFOLD | \ 2166 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \ 2167 EXT4_FEATURE_INCOMPAT_LARGEDIR) 2168 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2169 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2170 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 2171 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 2172 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 2173 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 2174 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 2175 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 2176 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 2177 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 2178 EXT4_FEATURE_RO_COMPAT_PROJECT |\ 2179 EXT4_FEATURE_RO_COMPAT_VERITY |\ 2180 EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT) 2181 2182 #define EXTN_FEATURE_FUNCS(ver) \ 2183 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 2184 { \ 2185 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 2186 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 2187 } \ 2188 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 2189 { \ 2190 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 2191 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 2192 } \ 2193 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 2194 { \ 2195 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 2196 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 2197 } 2198 2199 EXTN_FEATURE_FUNCS(2) 2200 EXTN_FEATURE_FUNCS(3) 2201 EXTN_FEATURE_FUNCS(4) 2202 2203 static inline bool ext4_has_compat_features(struct super_block *sb) 2204 { 2205 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 2206 } 2207 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 2208 { 2209 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 2210 } 2211 static inline bool ext4_has_incompat_features(struct super_block *sb) 2212 { 2213 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 2214 } 2215 2216 extern int ext4_feature_set_ok(struct super_block *sb, int readonly); 2217 2218 /* 2219 * Superblock flags 2220 */ 2221 #define EXT4_FLAGS_RESIZING 0 2222 #define EXT4_FLAGS_SHUTDOWN 1 2223 #define EXT4_FLAGS_BDEV_IS_DAX 2 2224 2225 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi) 2226 { 2227 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 2228 } 2229 2230 /* 2231 * Default values for user and/or group using reserved blocks 2232 */ 2233 #define EXT4_DEF_RESUID 0 2234 #define EXT4_DEF_RESGID 0 2235 2236 /* 2237 * Default project ID 2238 */ 2239 #define EXT4_DEF_PROJID 0 2240 2241 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 2242 2243 /* 2244 * Default mount options 2245 */ 2246 #define EXT4_DEFM_DEBUG 0x0001 2247 #define EXT4_DEFM_BSDGROUPS 0x0002 2248 #define EXT4_DEFM_XATTR_USER 0x0004 2249 #define EXT4_DEFM_ACL 0x0008 2250 #define EXT4_DEFM_UID16 0x0010 2251 #define EXT4_DEFM_JMODE 0x0060 2252 #define EXT4_DEFM_JMODE_DATA 0x0020 2253 #define EXT4_DEFM_JMODE_ORDERED 0x0040 2254 #define EXT4_DEFM_JMODE_WBACK 0x0060 2255 #define EXT4_DEFM_NOBARRIER 0x0100 2256 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 2257 #define EXT4_DEFM_DISCARD 0x0400 2258 #define EXT4_DEFM_NODELALLOC 0x0800 2259 2260 /* 2261 * Default journal batch times 2262 */ 2263 #define EXT4_DEF_MIN_BATCH_TIME 0 2264 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 2265 2266 /* 2267 * Minimum number of groups in a flexgroup before we separate out 2268 * directories into the first block group of a flexgroup 2269 */ 2270 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 2271 2272 /* 2273 * Structure of a directory entry 2274 */ 2275 #define EXT4_NAME_LEN 255 2276 /* 2277 * Base length of the ext4 directory entry excluding the name length 2278 */ 2279 #define EXT4_BASE_DIR_LEN (sizeof(struct ext4_dir_entry_2) - EXT4_NAME_LEN) 2280 2281 struct ext4_dir_entry { 2282 __le32 inode; /* Inode number */ 2283 __le16 rec_len; /* Directory entry length */ 2284 __le16 name_len; /* Name length */ 2285 char name[EXT4_NAME_LEN]; /* File name */ 2286 }; 2287 2288 2289 /* 2290 * Encrypted Casefolded entries require saving the hash on disk. This structure 2291 * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned 2292 * boundary. 2293 */ 2294 struct ext4_dir_entry_hash { 2295 __le32 hash; 2296 __le32 minor_hash; 2297 }; 2298 2299 /* 2300 * The new version of the directory entry. Since EXT4 structures are 2301 * stored in intel byte order, and the name_len field could never be 2302 * bigger than 255 chars, it's safe to reclaim the extra byte for the 2303 * file_type field. 2304 */ 2305 struct ext4_dir_entry_2 { 2306 __le32 inode; /* Inode number */ 2307 __le16 rec_len; /* Directory entry length */ 2308 __u8 name_len; /* Name length */ 2309 __u8 file_type; /* See file type macros EXT4_FT_* below */ 2310 char name[EXT4_NAME_LEN]; /* File name */ 2311 }; 2312 2313 /* 2314 * Access the hashes at the end of ext4_dir_entry_2 2315 */ 2316 #define EXT4_DIRENT_HASHES(entry) \ 2317 ((struct ext4_dir_entry_hash *) \ 2318 (((void *)(entry)) + \ 2319 ((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND))) 2320 #define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(de)->hash) 2321 #define EXT4_DIRENT_MINOR_HASH(entry) \ 2322 le32_to_cpu(EXT4_DIRENT_HASHES(de)->minor_hash) 2323 2324 static inline bool ext4_hash_in_dirent(const struct inode *inode) 2325 { 2326 return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode); 2327 } 2328 2329 /* 2330 * This is a bogus directory entry at the end of each leaf block that 2331 * records checksums. 2332 */ 2333 struct ext4_dir_entry_tail { 2334 __le32 det_reserved_zero1; /* Pretend to be unused */ 2335 __le16 det_rec_len; /* 12 */ 2336 __u8 det_reserved_zero2; /* Zero name length */ 2337 __u8 det_reserved_ft; /* 0xDE, fake file type */ 2338 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 2339 }; 2340 2341 #define EXT4_DIRENT_TAIL(block, blocksize) \ 2342 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 2343 ((blocksize) - \ 2344 sizeof(struct ext4_dir_entry_tail)))) 2345 2346 /* 2347 * Ext4 directory file types. Only the low 3 bits are used. The 2348 * other bits are reserved for now. 2349 */ 2350 #define EXT4_FT_UNKNOWN 0 2351 #define EXT4_FT_REG_FILE 1 2352 #define EXT4_FT_DIR 2 2353 #define EXT4_FT_CHRDEV 3 2354 #define EXT4_FT_BLKDEV 4 2355 #define EXT4_FT_FIFO 5 2356 #define EXT4_FT_SOCK 6 2357 #define EXT4_FT_SYMLINK 7 2358 2359 #define EXT4_FT_MAX 8 2360 2361 #define EXT4_FT_DIR_CSUM 0xDE 2362 2363 /* 2364 * EXT4_DIR_PAD defines the directory entries boundaries 2365 * 2366 * NOTE: It must be a multiple of 4 2367 */ 2368 #define EXT4_DIR_PAD 4 2369 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 2370 #define EXT4_MAX_REC_LEN ((1<<16)-1) 2371 2372 /* 2373 * The rec_len is dependent on the type of directory. Directories that are 2374 * casefolded and encrypted need to store the hash as well, so we add room for 2375 * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should 2376 * pass NULL for dir, as those entries do not use the extra fields. 2377 */ 2378 static inline unsigned int ext4_dir_rec_len(__u8 name_len, 2379 const struct inode *dir) 2380 { 2381 int rec_len = (name_len + 8 + EXT4_DIR_ROUND); 2382 2383 if (dir && ext4_hash_in_dirent(dir)) 2384 rec_len += sizeof(struct ext4_dir_entry_hash); 2385 return (rec_len & ~EXT4_DIR_ROUND); 2386 } 2387 2388 /* 2389 * If we ever get support for fs block sizes > page_size, we'll need 2390 * to remove the #if statements in the next two functions... 2391 */ 2392 static inline unsigned int 2393 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 2394 { 2395 unsigned len = le16_to_cpu(dlen); 2396 2397 #if (PAGE_SIZE >= 65536) 2398 if (len == EXT4_MAX_REC_LEN || len == 0) 2399 return blocksize; 2400 return (len & 65532) | ((len & 3) << 16); 2401 #else 2402 return len; 2403 #endif 2404 } 2405 2406 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 2407 { 2408 BUG_ON((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)); 2409 #if (PAGE_SIZE >= 65536) 2410 if (len < 65536) 2411 return cpu_to_le16(len); 2412 if (len == blocksize) { 2413 if (blocksize == 65536) 2414 return cpu_to_le16(EXT4_MAX_REC_LEN); 2415 else 2416 return cpu_to_le16(0); 2417 } 2418 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 2419 #else 2420 return cpu_to_le16(len); 2421 #endif 2422 } 2423 2424 /* 2425 * Hash Tree Directory indexing 2426 * (c) Daniel Phillips, 2001 2427 */ 2428 2429 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2430 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2431 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \ 2432 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir))) 2433 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2434 2435 /* Legal values for the dx_root hash_version field: */ 2436 2437 #define DX_HASH_LEGACY 0 2438 #define DX_HASH_HALF_MD4 1 2439 #define DX_HASH_TEA 2 2440 #define DX_HASH_LEGACY_UNSIGNED 3 2441 #define DX_HASH_HALF_MD4_UNSIGNED 4 2442 #define DX_HASH_TEA_UNSIGNED 5 2443 #define DX_HASH_SIPHASH 6 2444 2445 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 2446 const void *address, unsigned int length) 2447 { 2448 struct { 2449 struct shash_desc shash; 2450 char ctx[4]; 2451 } desc; 2452 2453 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2454 2455 desc.shash.tfm = sbi->s_chksum_driver; 2456 *(u32 *)desc.ctx = crc; 2457 2458 BUG_ON(crypto_shash_update(&desc.shash, address, length)); 2459 2460 return *(u32 *)desc.ctx; 2461 } 2462 2463 #ifdef __KERNEL__ 2464 2465 /* hash info structure used by the directory hash */ 2466 struct dx_hash_info 2467 { 2468 u32 hash; 2469 u32 minor_hash; 2470 int hash_version; 2471 u32 *seed; 2472 }; 2473 2474 2475 /* 32 and 64 bit signed EOF for dx directories */ 2476 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2477 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2478 2479 2480 /* 2481 * Control parameters used by ext4_htree_next_block 2482 */ 2483 #define HASH_NB_ALWAYS 1 2484 2485 struct ext4_filename { 2486 const struct qstr *usr_fname; 2487 struct fscrypt_str disk_name; 2488 struct dx_hash_info hinfo; 2489 #ifdef CONFIG_FS_ENCRYPTION 2490 struct fscrypt_str crypto_buf; 2491 #endif 2492 #if IS_ENABLED(CONFIG_UNICODE) 2493 struct fscrypt_str cf_name; 2494 #endif 2495 }; 2496 2497 #define fname_name(p) ((p)->disk_name.name) 2498 #define fname_usr_name(p) ((p)->usr_fname->name) 2499 #define fname_len(p) ((p)->disk_name.len) 2500 2501 /* 2502 * Describe an inode's exact location on disk and in memory 2503 */ 2504 struct ext4_iloc 2505 { 2506 struct buffer_head *bh; 2507 unsigned long offset; 2508 ext4_group_t block_group; 2509 }; 2510 2511 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2512 { 2513 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2514 } 2515 2516 static inline bool ext4_is_quota_file(struct inode *inode) 2517 { 2518 return IS_NOQUOTA(inode) && 2519 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL); 2520 } 2521 2522 /* 2523 * This structure is stuffed into the struct file's private_data field 2524 * for directories. It is where we put information so that we can do 2525 * readdir operations in hash tree order. 2526 */ 2527 struct dir_private_info { 2528 struct rb_root root; 2529 struct rb_node *curr_node; 2530 struct fname *extra_fname; 2531 loff_t last_pos; 2532 __u32 curr_hash; 2533 __u32 curr_minor_hash; 2534 __u32 next_hash; 2535 }; 2536 2537 /* calculate the first block number of the group */ 2538 static inline ext4_fsblk_t 2539 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2540 { 2541 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2542 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2543 } 2544 2545 /* 2546 * Special error return code only used by dx_probe() and its callers. 2547 */ 2548 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2549 2550 /* htree levels for ext4 */ 2551 #define EXT4_HTREE_LEVEL_COMPAT 2 2552 #define EXT4_HTREE_LEVEL 3 2553 2554 static inline int ext4_dir_htree_level(struct super_block *sb) 2555 { 2556 return ext4_has_feature_largedir(sb) ? 2557 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT; 2558 } 2559 2560 /* 2561 * Timeout and state flag for lazy initialization inode thread. 2562 */ 2563 #define EXT4_DEF_LI_WAIT_MULT 10 2564 #define EXT4_DEF_LI_MAX_START_DELAY 5 2565 #define EXT4_LAZYINIT_QUIT 0x0001 2566 #define EXT4_LAZYINIT_RUNNING 0x0002 2567 2568 /* 2569 * Lazy inode table initialization info 2570 */ 2571 struct ext4_lazy_init { 2572 unsigned long li_state; 2573 struct list_head li_request_list; 2574 struct mutex li_list_mtx; 2575 }; 2576 2577 enum ext4_li_mode { 2578 EXT4_LI_MODE_PREFETCH_BBITMAP, 2579 EXT4_LI_MODE_ITABLE, 2580 }; 2581 2582 struct ext4_li_request { 2583 struct super_block *lr_super; 2584 enum ext4_li_mode lr_mode; 2585 ext4_group_t lr_first_not_zeroed; 2586 ext4_group_t lr_next_group; 2587 struct list_head lr_request; 2588 unsigned long lr_next_sched; 2589 unsigned long lr_timeout; 2590 }; 2591 2592 struct ext4_features { 2593 struct kobject f_kobj; 2594 struct completion f_kobj_unregister; 2595 }; 2596 2597 /* 2598 * This structure will be used for multiple mount protection. It will be 2599 * written into the block number saved in the s_mmp_block field in the 2600 * superblock. Programs that check MMP should assume that if 2601 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2602 * to use the filesystem, regardless of how old the timestamp is. 2603 */ 2604 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2605 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2606 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2607 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2608 2609 struct mmp_struct { 2610 __le32 mmp_magic; /* Magic number for MMP */ 2611 __le32 mmp_seq; /* Sequence no. updated periodically */ 2612 2613 /* 2614 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2615 * purposes and do not affect the correctness of the algorithm 2616 */ 2617 __le64 mmp_time; /* Time last updated */ 2618 char mmp_nodename[64]; /* Node which last updated MMP block */ 2619 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2620 2621 /* 2622 * mmp_check_interval is used to verify if the MMP block has been 2623 * updated on the block device. The value is updated based on the 2624 * maximum time to write the MMP block during an update cycle. 2625 */ 2626 __le16 mmp_check_interval; 2627 2628 __le16 mmp_pad1; 2629 __le32 mmp_pad2[226]; 2630 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2631 }; 2632 2633 /* arguments passed to the mmp thread */ 2634 struct mmpd_data { 2635 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2636 struct super_block *sb; /* super block of the fs */ 2637 }; 2638 2639 /* 2640 * Check interval multiplier 2641 * The MMP block is written every update interval and initially checked every 2642 * update interval x the multiplier (the value is then adapted based on the 2643 * write latency). The reason is that writes can be delayed under load and we 2644 * don't want readers to incorrectly assume that the filesystem is no longer 2645 * in use. 2646 */ 2647 #define EXT4_MMP_CHECK_MULT 2UL 2648 2649 /* 2650 * Minimum interval for MMP checking in seconds. 2651 */ 2652 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2653 2654 /* 2655 * Maximum interval for MMP checking in seconds. 2656 */ 2657 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2658 2659 /* 2660 * Function prototypes 2661 */ 2662 2663 /* 2664 * Ok, these declarations are also in <linux/kernel.h> but none of the 2665 * ext4 source programs needs to include it so they are duplicated here. 2666 */ 2667 # define NORET_TYPE /**/ 2668 # define ATTRIB_NORET __attribute__((noreturn)) 2669 # define NORET_AND noreturn, 2670 2671 /* bitmap.c */ 2672 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2673 void ext4_inode_bitmap_csum_set(struct super_block *sb, 2674 struct ext4_group_desc *gdp, 2675 struct buffer_head *bh, int sz); 2676 int ext4_inode_bitmap_csum_verify(struct super_block *sb, 2677 struct ext4_group_desc *gdp, 2678 struct buffer_head *bh, int sz); 2679 void ext4_block_bitmap_csum_set(struct super_block *sb, 2680 struct ext4_group_desc *gdp, 2681 struct buffer_head *bh); 2682 int ext4_block_bitmap_csum_verify(struct super_block *sb, 2683 struct ext4_group_desc *gdp, 2684 struct buffer_head *bh); 2685 2686 /* balloc.c */ 2687 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2688 ext4_fsblk_t blocknr, 2689 ext4_group_t *blockgrpp, 2690 ext4_grpblk_t *offsetp); 2691 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2692 ext4_fsblk_t block); 2693 2694 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2695 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2696 ext4_group_t group); 2697 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2698 ext4_fsblk_t goal, 2699 unsigned int flags, 2700 unsigned long *count, 2701 int *errp); 2702 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2703 s64 nclusters, unsigned int flags); 2704 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2705 extern void ext4_check_blocks_bitmap(struct super_block *); 2706 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2707 ext4_group_t block_group, 2708 struct buffer_head ** bh); 2709 extern struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2710 ext4_group_t group); 2711 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2712 2713 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2714 ext4_group_t block_group, 2715 bool ignore_locked); 2716 extern int ext4_wait_block_bitmap(struct super_block *sb, 2717 ext4_group_t block_group, 2718 struct buffer_head *bh); 2719 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2720 ext4_group_t block_group); 2721 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2722 ext4_group_t block_group, 2723 struct ext4_group_desc *gdp); 2724 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2725 2726 #if IS_ENABLED(CONFIG_UNICODE) 2727 extern int ext4_fname_setup_ci_filename(struct inode *dir, 2728 const struct qstr *iname, 2729 struct ext4_filename *fname); 2730 #endif 2731 2732 /* ext4 encryption related stuff goes here crypto.c */ 2733 #ifdef CONFIG_FS_ENCRYPTION 2734 extern const struct fscrypt_operations ext4_cryptops; 2735 2736 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname, 2737 int lookup, struct ext4_filename *fname); 2738 2739 int ext4_fname_prepare_lookup(struct inode *dir, struct dentry *dentry, 2740 struct ext4_filename *fname); 2741 2742 void ext4_fname_free_filename(struct ext4_filename *fname); 2743 2744 int ext4_ioctl_get_encryption_pwsalt(struct file *filp, void __user *arg); 2745 2746 #else /* !CONFIG_FS_ENCRYPTION */ 2747 static inline int ext4_fname_setup_filename(struct inode *dir, 2748 const struct qstr *iname, 2749 int lookup, 2750 struct ext4_filename *fname) 2751 { 2752 int err = 0; 2753 fname->usr_fname = iname; 2754 fname->disk_name.name = (unsigned char *) iname->name; 2755 fname->disk_name.len = iname->len; 2756 2757 #if IS_ENABLED(CONFIG_UNICODE) 2758 err = ext4_fname_setup_ci_filename(dir, iname, fname); 2759 #endif 2760 2761 return err; 2762 } 2763 2764 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2765 struct dentry *dentry, 2766 struct ext4_filename *fname) 2767 { 2768 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname); 2769 } 2770 2771 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2772 { 2773 #if IS_ENABLED(CONFIG_UNICODE) 2774 kfree(fname->cf_name.name); 2775 fname->cf_name.name = NULL; 2776 #endif 2777 } 2778 2779 static inline int ext4_ioctl_get_encryption_pwsalt(struct file *filp, 2780 void __user *arg) 2781 { 2782 return -EOPNOTSUPP; 2783 } 2784 #endif /* !CONFIG_FS_ENCRYPTION */ 2785 2786 /* dir.c */ 2787 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2788 struct file *, 2789 struct ext4_dir_entry_2 *, 2790 struct buffer_head *, char *, int, 2791 unsigned int); 2792 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2793 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2794 (de), (bh), (buf), (size), (offset))) 2795 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2796 __u32 minor_hash, 2797 struct ext4_dir_entry_2 *dirent, 2798 struct fscrypt_str *ent_name); 2799 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2800 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2801 struct buffer_head *bh, 2802 void *buf, int buf_size, 2803 struct ext4_filename *fname, 2804 struct ext4_dir_entry_2 **dest_de); 2805 void ext4_insert_dentry(struct inode *dir, struct inode *inode, 2806 struct ext4_dir_entry_2 *de, 2807 int buf_size, 2808 struct ext4_filename *fname); 2809 static inline void ext4_update_dx_flag(struct inode *inode) 2810 { 2811 if (!ext4_has_feature_dir_index(inode->i_sb) && 2812 ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) { 2813 /* ext4_iget() should have caught this... */ 2814 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb)); 2815 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2816 } 2817 } 2818 static const unsigned char ext4_filetype_table[] = { 2819 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2820 }; 2821 2822 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2823 { 2824 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2825 return DT_UNKNOWN; 2826 2827 return ext4_filetype_table[filetype]; 2828 } 2829 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2830 void *buf, int buf_size); 2831 2832 /* fsync.c */ 2833 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2834 2835 /* hash.c */ 2836 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len, 2837 struct dx_hash_info *hinfo); 2838 2839 /* ialloc.c */ 2840 extern int ext4_mark_inode_used(struct super_block *sb, int ino); 2841 extern struct inode *__ext4_new_inode(struct mnt_idmap *, handle_t *, 2842 struct inode *, umode_t, 2843 const struct qstr *qstr, __u32 goal, 2844 uid_t *owner, __u32 i_flags, 2845 int handle_type, unsigned int line_no, 2846 int nblocks); 2847 2848 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \ 2849 __ext4_new_inode(&nop_mnt_idmap, (handle), (dir), (mode), (qstr), \ 2850 (goal), (owner), i_flags, 0, 0, 0) 2851 #define ext4_new_inode_start_handle(idmap, dir, mode, qstr, goal, owner, \ 2852 type, nblocks) \ 2853 __ext4_new_inode((idmap), NULL, (dir), (mode), (qstr), (goal), (owner), \ 2854 0, (type), __LINE__, (nblocks)) 2855 2856 2857 extern void ext4_free_inode(handle_t *, struct inode *); 2858 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2859 extern unsigned long ext4_count_free_inodes(struct super_block *); 2860 extern unsigned long ext4_count_dirs(struct super_block *); 2861 extern void ext4_check_inodes_bitmap(struct super_block *); 2862 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2863 extern int ext4_init_inode_table(struct super_block *sb, 2864 ext4_group_t group, int barrier); 2865 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2866 2867 /* fast_commit.c */ 2868 int ext4_fc_info_show(struct seq_file *seq, void *v); 2869 void ext4_fc_init(struct super_block *sb, journal_t *journal); 2870 void ext4_fc_init_inode(struct inode *inode); 2871 void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start, 2872 ext4_lblk_t end); 2873 void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode, 2874 struct dentry *dentry); 2875 void __ext4_fc_track_link(handle_t *handle, struct inode *inode, 2876 struct dentry *dentry); 2877 void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry); 2878 void ext4_fc_track_link(handle_t *handle, struct dentry *dentry); 2879 void __ext4_fc_track_create(handle_t *handle, struct inode *inode, 2880 struct dentry *dentry); 2881 void ext4_fc_track_create(handle_t *handle, struct dentry *dentry); 2882 void ext4_fc_track_inode(handle_t *handle, struct inode *inode); 2883 void ext4_fc_mark_ineligible(struct super_block *sb, int reason, handle_t *handle); 2884 void ext4_fc_start_update(struct inode *inode); 2885 void ext4_fc_stop_update(struct inode *inode); 2886 void ext4_fc_del(struct inode *inode); 2887 bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block); 2888 void ext4_fc_replay_cleanup(struct super_block *sb); 2889 int ext4_fc_commit(journal_t *journal, tid_t commit_tid); 2890 int __init ext4_fc_init_dentry_cache(void); 2891 void ext4_fc_destroy_dentry_cache(void); 2892 int ext4_fc_record_regions(struct super_block *sb, int ino, 2893 ext4_lblk_t lblk, ext4_fsblk_t pblk, 2894 int len, int replay); 2895 2896 /* mballoc.c */ 2897 extern const struct seq_operations ext4_mb_seq_groups_ops; 2898 extern const struct seq_operations ext4_mb_seq_structs_summary_ops; 2899 extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset); 2900 extern int ext4_mb_init(struct super_block *); 2901 extern int ext4_mb_release(struct super_block *); 2902 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2903 struct ext4_allocation_request *, int *); 2904 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2905 extern void ext4_discard_preallocations(struct inode *, unsigned int); 2906 extern int __init ext4_init_mballoc(void); 2907 extern void ext4_exit_mballoc(void); 2908 extern ext4_group_t ext4_mb_prefetch(struct super_block *sb, 2909 ext4_group_t group, 2910 unsigned int nr, int *cnt); 2911 extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group, 2912 unsigned int nr); 2913 2914 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2915 struct buffer_head *bh, ext4_fsblk_t block, 2916 unsigned long count, int flags); 2917 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2918 ext4_group_t ngroups); 2919 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2920 ext4_group_t i, struct ext4_group_desc *desc); 2921 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2922 ext4_fsblk_t block, unsigned long count); 2923 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2924 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid); 2925 extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block, 2926 int len, int state); 2927 2928 /* inode.c */ 2929 void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw, 2930 struct ext4_inode_info *ei); 2931 int ext4_inode_is_fast_symlink(struct inode *inode); 2932 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2933 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2934 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count, 2935 bool wait, struct buffer_head **bhs); 2936 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2937 struct buffer_head *bh_result, int create); 2938 int ext4_get_block(struct inode *inode, sector_t iblock, 2939 struct buffer_head *bh_result, int create); 2940 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2941 struct buffer_head *bh, int create); 2942 int ext4_walk_page_buffers(handle_t *handle, 2943 struct inode *inode, 2944 struct buffer_head *head, 2945 unsigned from, 2946 unsigned to, 2947 int *partial, 2948 int (*fn)(handle_t *handle, struct inode *inode, 2949 struct buffer_head *bh)); 2950 int do_journal_get_write_access(handle_t *handle, struct inode *inode, 2951 struct buffer_head *bh); 2952 #define FALL_BACK_TO_NONDELALLOC 1 2953 #define CONVERT_INLINE_DATA 2 2954 2955 typedef enum { 2956 EXT4_IGET_NORMAL = 0, 2957 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */ 2958 EXT4_IGET_HANDLE = 0x0002, /* Inode # is from a handle */ 2959 EXT4_IGET_BAD = 0x0004, /* Allow to iget a bad inode */ 2960 EXT4_IGET_EA_INODE = 0x0008 /* Inode should contain an EA value */ 2961 } ext4_iget_flags; 2962 2963 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, 2964 ext4_iget_flags flags, const char *function, 2965 unsigned int line); 2966 2967 #define ext4_iget(sb, ino, flags) \ 2968 __ext4_iget((sb), (ino), (flags), __func__, __LINE__) 2969 2970 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2971 extern int ext4_setattr(struct mnt_idmap *, struct dentry *, 2972 struct iattr *); 2973 extern u32 ext4_dio_alignment(struct inode *inode); 2974 extern int ext4_getattr(struct mnt_idmap *, const struct path *, 2975 struct kstat *, u32, unsigned int); 2976 extern void ext4_evict_inode(struct inode *); 2977 extern void ext4_clear_inode(struct inode *); 2978 extern int ext4_file_getattr(struct mnt_idmap *, const struct path *, 2979 struct kstat *, u32, unsigned int); 2980 extern int ext4_sync_inode(handle_t *, struct inode *); 2981 extern void ext4_dirty_inode(struct inode *, int); 2982 extern int ext4_change_inode_journal_flag(struct inode *, int); 2983 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2984 extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino, 2985 struct ext4_iloc *iloc); 2986 extern int ext4_inode_attach_jinode(struct inode *inode); 2987 extern int ext4_can_truncate(struct inode *inode); 2988 extern int ext4_truncate(struct inode *); 2989 extern int ext4_break_layouts(struct inode *); 2990 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length); 2991 extern void ext4_set_inode_flags(struct inode *, bool init); 2992 extern int ext4_alloc_da_blocks(struct inode *inode); 2993 extern void ext4_set_aops(struct inode *inode); 2994 extern int ext4_writepage_trans_blocks(struct inode *); 2995 extern int ext4_normal_submit_inode_data_buffers(struct jbd2_inode *jinode); 2996 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2997 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2998 loff_t lstart, loff_t lend); 2999 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf); 3000 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 3001 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 3002 extern void ext4_da_release_space(struct inode *inode, int to_free); 3003 extern void ext4_da_update_reserve_space(struct inode *inode, 3004 int used, int quota_claim); 3005 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 3006 ext4_fsblk_t pblk, ext4_lblk_t len); 3007 3008 /* indirect.c */ 3009 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 3010 struct ext4_map_blocks *map, int flags); 3011 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 3012 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 3013 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 3014 ext4_lblk_t start, ext4_lblk_t end); 3015 3016 /* ioctl.c */ 3017 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 3018 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 3019 int ext4_fileattr_set(struct mnt_idmap *idmap, 3020 struct dentry *dentry, struct fileattr *fa); 3021 int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa); 3022 extern void ext4_reset_inode_seed(struct inode *inode); 3023 int ext4_update_overhead(struct super_block *sb, bool force); 3024 int ext4_force_shutdown(struct super_block *sb, u32 flags); 3025 3026 /* migrate.c */ 3027 extern int ext4_ext_migrate(struct inode *); 3028 extern int ext4_ind_migrate(struct inode *inode); 3029 3030 /* namei.c */ 3031 extern int ext4_init_new_dir(handle_t *handle, struct inode *dir, 3032 struct inode *inode); 3033 extern int ext4_dirblock_csum_verify(struct inode *inode, 3034 struct buffer_head *bh); 3035 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 3036 __u32 start_minor_hash, __u32 *next_hash); 3037 extern int ext4_search_dir(struct buffer_head *bh, 3038 char *search_buf, 3039 int buf_size, 3040 struct inode *dir, 3041 struct ext4_filename *fname, 3042 unsigned int offset, 3043 struct ext4_dir_entry_2 **res_dir); 3044 extern int ext4_generic_delete_entry(struct inode *dir, 3045 struct ext4_dir_entry_2 *de_del, 3046 struct buffer_head *bh, 3047 void *entry_buf, 3048 int buf_size, 3049 int csum_size); 3050 extern bool ext4_empty_dir(struct inode *inode); 3051 3052 /* resize.c */ 3053 extern void ext4_kvfree_array_rcu(void *to_free); 3054 extern int ext4_group_add(struct super_block *sb, 3055 struct ext4_new_group_data *input); 3056 extern int ext4_group_extend(struct super_block *sb, 3057 struct ext4_super_block *es, 3058 ext4_fsblk_t n_blocks_count); 3059 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 3060 extern unsigned int ext4_list_backups(struct super_block *sb, 3061 unsigned int *three, unsigned int *five, 3062 unsigned int *seven); 3063 3064 /* super.c */ 3065 extern struct buffer_head *ext4_sb_bread(struct super_block *sb, 3066 sector_t block, blk_opf_t op_flags); 3067 extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb, 3068 sector_t block); 3069 extern void ext4_read_bh_nowait(struct buffer_head *bh, blk_opf_t op_flags, 3070 bh_end_io_t *end_io); 3071 extern int ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags, 3072 bh_end_io_t *end_io); 3073 extern int ext4_read_bh_lock(struct buffer_head *bh, blk_opf_t op_flags, bool wait); 3074 extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block); 3075 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 3076 extern int ext4_calculate_overhead(struct super_block *sb); 3077 extern __le32 ext4_superblock_csum(struct super_block *sb, 3078 struct ext4_super_block *es); 3079 extern void ext4_superblock_csum_set(struct super_block *sb); 3080 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 3081 ext4_group_t ngroup); 3082 extern const char *ext4_decode_error(struct super_block *sb, int errno, 3083 char nbuf[16]); 3084 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb, 3085 ext4_group_t block_group, 3086 unsigned int flags); 3087 3088 extern __printf(7, 8) 3089 void __ext4_error(struct super_block *, const char *, unsigned int, bool, 3090 int, __u64, const char *, ...); 3091 extern __printf(6, 7) 3092 void __ext4_error_inode(struct inode *, const char *, unsigned int, 3093 ext4_fsblk_t, int, const char *, ...); 3094 extern __printf(5, 6) 3095 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 3096 const char *, ...); 3097 extern void __ext4_std_error(struct super_block *, const char *, 3098 unsigned int, int); 3099 extern __printf(4, 5) 3100 void __ext4_warning(struct super_block *, const char *, unsigned int, 3101 const char *, ...); 3102 extern __printf(4, 5) 3103 void __ext4_warning_inode(const struct inode *inode, const char *function, 3104 unsigned int line, const char *fmt, ...); 3105 extern __printf(3, 4) 3106 void __ext4_msg(struct super_block *, const char *, const char *, ...); 3107 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 3108 const char *, unsigned int, const char *); 3109 extern __printf(7, 8) 3110 void __ext4_grp_locked_error(const char *, unsigned int, 3111 struct super_block *, ext4_group_t, 3112 unsigned long, ext4_fsblk_t, 3113 const char *, ...); 3114 3115 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 3116 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 3117 3118 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \ 3119 __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a) 3120 3121 #define ext4_error_inode_block(inode, block, err, fmt, a...) \ 3122 __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \ 3123 (fmt), ## a) 3124 3125 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 3126 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 3127 3128 #define ext4_abort(sb, err, fmt, a...) \ 3129 __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a) 3130 3131 #ifdef CONFIG_PRINTK 3132 3133 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 3134 __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__) 3135 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 3136 __ext4_error_inode((inode), (func), (line), (block), \ 3137 (err), (fmt), ##__VA_ARGS__) 3138 #define ext4_error_file(file, func, line, block, fmt, ...) \ 3139 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 3140 #define ext4_error(sb, fmt, ...) \ 3141 __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt), \ 3142 ##__VA_ARGS__) 3143 #define ext4_error_err(sb, err, fmt, ...) \ 3144 __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt), \ 3145 ##__VA_ARGS__) 3146 #define ext4_warning(sb, fmt, ...) \ 3147 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 3148 #define ext4_warning_inode(inode, fmt, ...) \ 3149 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 3150 #define ext4_msg(sb, level, fmt, ...) \ 3151 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 3152 #define dump_mmp_msg(sb, mmp, msg) \ 3153 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 3154 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 3155 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 3156 fmt, ##__VA_ARGS__) 3157 3158 #else 3159 3160 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 3161 do { \ 3162 no_printk(fmt, ##__VA_ARGS__); \ 3163 __ext4_error_inode(inode, "", 0, block, 0, " "); \ 3164 } while (0) 3165 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 3166 do { \ 3167 no_printk(fmt, ##__VA_ARGS__); \ 3168 __ext4_error_inode(inode, "", 0, block, err, " "); \ 3169 } while (0) 3170 #define ext4_error_file(file, func, line, block, fmt, ...) \ 3171 do { \ 3172 no_printk(fmt, ##__VA_ARGS__); \ 3173 __ext4_error_file(file, "", 0, block, " "); \ 3174 } while (0) 3175 #define ext4_error(sb, fmt, ...) \ 3176 do { \ 3177 no_printk(fmt, ##__VA_ARGS__); \ 3178 __ext4_error(sb, "", 0, false, 0, 0, " "); \ 3179 } while (0) 3180 #define ext4_error_err(sb, err, fmt, ...) \ 3181 do { \ 3182 no_printk(fmt, ##__VA_ARGS__); \ 3183 __ext4_error(sb, "", 0, false, err, 0, " "); \ 3184 } while (0) 3185 #define ext4_warning(sb, fmt, ...) \ 3186 do { \ 3187 no_printk(fmt, ##__VA_ARGS__); \ 3188 __ext4_warning(sb, "", 0, " "); \ 3189 } while (0) 3190 #define ext4_warning_inode(inode, fmt, ...) \ 3191 do { \ 3192 no_printk(fmt, ##__VA_ARGS__); \ 3193 __ext4_warning_inode(inode, "", 0, " "); \ 3194 } while (0) 3195 #define ext4_msg(sb, level, fmt, ...) \ 3196 do { \ 3197 no_printk(fmt, ##__VA_ARGS__); \ 3198 __ext4_msg(sb, "", " "); \ 3199 } while (0) 3200 #define dump_mmp_msg(sb, mmp, msg) \ 3201 __dump_mmp_msg(sb, mmp, "", 0, "") 3202 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 3203 do { \ 3204 no_printk(fmt, ##__VA_ARGS__); \ 3205 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 3206 } while (0) 3207 3208 #endif 3209 3210 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 3211 struct ext4_group_desc *bg); 3212 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 3213 struct ext4_group_desc *bg); 3214 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 3215 struct ext4_group_desc *bg); 3216 extern __u32 ext4_free_group_clusters(struct super_block *sb, 3217 struct ext4_group_desc *bg); 3218 extern __u32 ext4_free_inodes_count(struct super_block *sb, 3219 struct ext4_group_desc *bg); 3220 extern __u32 ext4_used_dirs_count(struct super_block *sb, 3221 struct ext4_group_desc *bg); 3222 extern __u32 ext4_itable_unused_count(struct super_block *sb, 3223 struct ext4_group_desc *bg); 3224 extern void ext4_block_bitmap_set(struct super_block *sb, 3225 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3226 extern void ext4_inode_bitmap_set(struct super_block *sb, 3227 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3228 extern void ext4_inode_table_set(struct super_block *sb, 3229 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3230 extern void ext4_free_group_clusters_set(struct super_block *sb, 3231 struct ext4_group_desc *bg, 3232 __u32 count); 3233 extern void ext4_free_inodes_set(struct super_block *sb, 3234 struct ext4_group_desc *bg, __u32 count); 3235 extern void ext4_used_dirs_set(struct super_block *sb, 3236 struct ext4_group_desc *bg, __u32 count); 3237 extern void ext4_itable_unused_set(struct super_block *sb, 3238 struct ext4_group_desc *bg, __u32 count); 3239 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 3240 struct ext4_group_desc *gdp); 3241 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 3242 struct ext4_group_desc *gdp); 3243 extern int ext4_register_li_request(struct super_block *sb, 3244 ext4_group_t first_not_zeroed); 3245 3246 static inline int ext4_has_metadata_csum(struct super_block *sb) 3247 { 3248 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 3249 !EXT4_SB(sb)->s_chksum_driver); 3250 3251 return ext4_has_feature_metadata_csum(sb) && 3252 (EXT4_SB(sb)->s_chksum_driver != NULL); 3253 } 3254 3255 static inline int ext4_has_group_desc_csum(struct super_block *sb) 3256 { 3257 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb); 3258 } 3259 3260 #define ext4_read_incompat_64bit_val(es, name) \ 3261 (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \ 3262 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \ 3263 le32_to_cpu(es->name##_lo)) 3264 3265 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 3266 { 3267 return ext4_read_incompat_64bit_val(es, s_blocks_count); 3268 } 3269 3270 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 3271 { 3272 return ext4_read_incompat_64bit_val(es, s_r_blocks_count); 3273 } 3274 3275 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 3276 { 3277 return ext4_read_incompat_64bit_val(es, s_free_blocks_count); 3278 } 3279 3280 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 3281 ext4_fsblk_t blk) 3282 { 3283 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 3284 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 3285 } 3286 3287 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 3288 ext4_fsblk_t blk) 3289 { 3290 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 3291 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 3292 } 3293 3294 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 3295 ext4_fsblk_t blk) 3296 { 3297 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 3298 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 3299 } 3300 3301 static inline loff_t ext4_isize(struct super_block *sb, 3302 struct ext4_inode *raw_inode) 3303 { 3304 if (ext4_has_feature_largedir(sb) || 3305 S_ISREG(le16_to_cpu(raw_inode->i_mode))) 3306 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 3307 le32_to_cpu(raw_inode->i_size_lo); 3308 3309 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 3310 } 3311 3312 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 3313 { 3314 raw_inode->i_size_lo = cpu_to_le32(i_size); 3315 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 3316 } 3317 3318 /* 3319 * Reading s_groups_count requires using smp_rmb() afterwards. See 3320 * the locking protocol documented in the comments of ext4_group_add() 3321 * in resize.c 3322 */ 3323 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 3324 { 3325 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 3326 3327 smp_rmb(); 3328 return ngroups; 3329 } 3330 3331 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 3332 ext4_group_t block_group) 3333 { 3334 return block_group >> sbi->s_log_groups_per_flex; 3335 } 3336 3337 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 3338 { 3339 return 1 << sbi->s_log_groups_per_flex; 3340 } 3341 3342 #define ext4_std_error(sb, errno) \ 3343 do { \ 3344 if ((errno)) \ 3345 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 3346 } while (0) 3347 3348 #ifdef CONFIG_SMP 3349 /* Each CPU can accumulate percpu_counter_batch clusters in their local 3350 * counters. So we need to make sure we have free clusters more 3351 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 3352 */ 3353 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 3354 #else 3355 #define EXT4_FREECLUSTERS_WATERMARK 0 3356 #endif 3357 3358 /* Update i_disksize. Requires i_rwsem to avoid races with truncate */ 3359 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 3360 { 3361 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 3362 !inode_is_locked(inode)); 3363 down_write(&EXT4_I(inode)->i_data_sem); 3364 if (newsize > EXT4_I(inode)->i_disksize) 3365 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize); 3366 up_write(&EXT4_I(inode)->i_data_sem); 3367 } 3368 3369 /* Update i_size, i_disksize. Requires i_rwsem to avoid races with truncate */ 3370 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 3371 { 3372 int changed = 0; 3373 3374 if (newsize > inode->i_size) { 3375 i_size_write(inode, newsize); 3376 changed = 1; 3377 } 3378 if (newsize > EXT4_I(inode)->i_disksize) { 3379 ext4_update_i_disksize(inode, newsize); 3380 changed |= 2; 3381 } 3382 return changed; 3383 } 3384 3385 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 3386 loff_t len); 3387 3388 struct ext4_group_info { 3389 unsigned long bb_state; 3390 #ifdef AGGRESSIVE_CHECK 3391 unsigned long bb_check_counter; 3392 #endif 3393 struct rb_root bb_free_root; 3394 ext4_grpblk_t bb_first_free; /* first free block */ 3395 ext4_grpblk_t bb_free; /* total free blocks */ 3396 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 3397 int bb_avg_fragment_size_order; /* order of average 3398 fragment in BG */ 3399 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 3400 ext4_group_t bb_group; /* Group number */ 3401 struct list_head bb_prealloc_list; 3402 #ifdef DOUBLE_CHECK 3403 void *bb_bitmap; 3404 #endif 3405 struct rw_semaphore alloc_sem; 3406 struct list_head bb_avg_fragment_size_node; 3407 struct list_head bb_largest_free_order_node; 3408 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 3409 * regions, index is order. 3410 * bb_counters[3] = 5 means 3411 * 5 free 8-block regions. */ 3412 }; 3413 3414 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 3415 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 3416 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 3417 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 3418 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \ 3419 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT) 3420 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \ 3421 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT) 3422 #define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4 3423 3424 #define EXT4_MB_GRP_NEED_INIT(grp) \ 3425 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 3426 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 3427 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3428 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 3429 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3430 3431 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 3432 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3433 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 3434 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3435 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 3436 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3437 #define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \ 3438 (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state))) 3439 3440 #define EXT4_MAX_CONTENTION 8 3441 #define EXT4_CONTENTION_THRESHOLD 2 3442 3443 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 3444 ext4_group_t group) 3445 { 3446 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 3447 } 3448 3449 /* 3450 * Returns true if the filesystem is busy enough that attempts to 3451 * access the block group locks has run into contention. 3452 */ 3453 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 3454 { 3455 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 3456 } 3457 3458 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 3459 { 3460 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 3461 if (spin_trylock(lock)) 3462 /* 3463 * We're able to grab the lock right away, so drop the 3464 * lock contention counter. 3465 */ 3466 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 3467 else { 3468 /* 3469 * The lock is busy, so bump the contention counter, 3470 * and then wait on the spin lock. 3471 */ 3472 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 3473 EXT4_MAX_CONTENTION); 3474 spin_lock(lock); 3475 } 3476 } 3477 3478 static inline void ext4_unlock_group(struct super_block *sb, 3479 ext4_group_t group) 3480 { 3481 spin_unlock(ext4_group_lock_ptr(sb, group)); 3482 } 3483 3484 #ifdef CONFIG_QUOTA 3485 static inline bool ext4_quota_capable(struct super_block *sb) 3486 { 3487 return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb)); 3488 } 3489 3490 static inline bool ext4_is_quota_journalled(struct super_block *sb) 3491 { 3492 struct ext4_sb_info *sbi = EXT4_SB(sb); 3493 3494 return (ext4_has_feature_quota(sb) || 3495 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]); 3496 } 3497 int ext4_enable_quotas(struct super_block *sb); 3498 #endif 3499 3500 /* 3501 * Block validity checking 3502 */ 3503 #define ext4_check_indirect_blockref(inode, bh) \ 3504 ext4_check_blockref(__func__, __LINE__, inode, \ 3505 (__le32 *)(bh)->b_data, \ 3506 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 3507 3508 #define ext4_ind_check_inode(inode) \ 3509 ext4_check_blockref(__func__, __LINE__, inode, \ 3510 EXT4_I(inode)->i_data, \ 3511 EXT4_NDIR_BLOCKS) 3512 3513 /* 3514 * Inodes and files operations 3515 */ 3516 3517 /* dir.c */ 3518 extern const struct file_operations ext4_dir_operations; 3519 3520 /* file.c */ 3521 extern const struct inode_operations ext4_file_inode_operations; 3522 extern const struct file_operations ext4_file_operations; 3523 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 3524 3525 /* inline.c */ 3526 extern int ext4_get_max_inline_size(struct inode *inode); 3527 extern int ext4_find_inline_data_nolock(struct inode *inode); 3528 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 3529 unsigned int len); 3530 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 3531 3532 int ext4_readpage_inline(struct inode *inode, struct folio *folio); 3533 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 3534 struct inode *inode, 3535 loff_t pos, unsigned len, 3536 struct page **pagep); 3537 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len, 3538 unsigned copied, struct folio *folio); 3539 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 3540 struct inode *inode, 3541 loff_t pos, unsigned len, 3542 struct page **pagep, 3543 void **fsdata); 3544 extern int ext4_try_add_inline_entry(handle_t *handle, 3545 struct ext4_filename *fname, 3546 struct inode *dir, struct inode *inode); 3547 extern int ext4_try_create_inline_dir(handle_t *handle, 3548 struct inode *parent, 3549 struct inode *inode); 3550 extern int ext4_read_inline_dir(struct file *filp, 3551 struct dir_context *ctx, 3552 int *has_inline_data); 3553 extern int ext4_inlinedir_to_tree(struct file *dir_file, 3554 struct inode *dir, ext4_lblk_t block, 3555 struct dx_hash_info *hinfo, 3556 __u32 start_hash, __u32 start_minor_hash, 3557 int *has_inline_data); 3558 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3559 struct ext4_filename *fname, 3560 struct ext4_dir_entry_2 **res_dir, 3561 int *has_inline_data); 3562 extern int ext4_delete_inline_entry(handle_t *handle, 3563 struct inode *dir, 3564 struct ext4_dir_entry_2 *de_del, 3565 struct buffer_head *bh, 3566 int *has_inline_data); 3567 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); 3568 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3569 struct ext4_dir_entry_2 **parent_de, 3570 int *retval); 3571 extern void *ext4_read_inline_link(struct inode *inode); 3572 3573 struct iomap; 3574 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap); 3575 3576 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3577 3578 extern int ext4_convert_inline_data(struct inode *inode); 3579 3580 static inline int ext4_has_inline_data(struct inode *inode) 3581 { 3582 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3583 EXT4_I(inode)->i_inline_off; 3584 } 3585 3586 /* namei.c */ 3587 extern const struct inode_operations ext4_dir_inode_operations; 3588 extern const struct inode_operations ext4_special_inode_operations; 3589 extern struct dentry *ext4_get_parent(struct dentry *child); 3590 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3591 struct ext4_dir_entry_2 *de, 3592 int blocksize, int csum_size, 3593 unsigned int parent_ino, int dotdot_real_len); 3594 extern void ext4_initialize_dirent_tail(struct buffer_head *bh, 3595 unsigned int blocksize); 3596 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode, 3597 struct buffer_head *bh); 3598 extern int __ext4_unlink(struct inode *dir, const struct qstr *d_name, 3599 struct inode *inode, struct dentry *dentry); 3600 extern int __ext4_link(struct inode *dir, struct inode *inode, 3601 struct dentry *dentry); 3602 3603 #define S_SHIFT 12 3604 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = { 3605 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3606 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3607 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3608 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3609 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3610 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3611 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3612 }; 3613 3614 static inline void ext4_set_de_type(struct super_block *sb, 3615 struct ext4_dir_entry_2 *de, 3616 umode_t mode) { 3617 if (ext4_has_feature_filetype(sb)) 3618 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3619 } 3620 3621 /* readpages.c */ 3622 extern int ext4_mpage_readpages(struct inode *inode, 3623 struct readahead_control *rac, struct folio *folio); 3624 extern int __init ext4_init_post_read_processing(void); 3625 extern void ext4_exit_post_read_processing(void); 3626 3627 /* symlink.c */ 3628 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3629 extern const struct inode_operations ext4_symlink_inode_operations; 3630 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3631 3632 /* sysfs.c */ 3633 extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi); 3634 extern int ext4_register_sysfs(struct super_block *sb); 3635 extern void ext4_unregister_sysfs(struct super_block *sb); 3636 extern int __init ext4_init_sysfs(void); 3637 extern void ext4_exit_sysfs(void); 3638 3639 /* block_validity */ 3640 extern void ext4_release_system_zone(struct super_block *sb); 3641 extern int ext4_setup_system_zone(struct super_block *sb); 3642 extern int __init ext4_init_system_zone(void); 3643 extern void ext4_exit_system_zone(void); 3644 extern int ext4_inode_block_valid(struct inode *inode, 3645 ext4_fsblk_t start_blk, 3646 unsigned int count); 3647 extern int ext4_check_blockref(const char *, unsigned int, 3648 struct inode *, __le32 *, unsigned int); 3649 extern int ext4_sb_block_valid(struct super_block *sb, struct inode *inode, 3650 ext4_fsblk_t start_blk, unsigned int count); 3651 3652 3653 /* extents.c */ 3654 struct ext4_ext_path; 3655 struct ext4_extent; 3656 3657 /* 3658 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3659 * __le32. 3660 */ 3661 #define EXT_MAX_BLOCKS 0xffffffff 3662 3663 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode); 3664 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3665 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3666 struct ext4_map_blocks *map, int flags); 3667 extern int ext4_ext_truncate(handle_t *, struct inode *); 3668 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3669 ext4_lblk_t end); 3670 extern void ext4_ext_init(struct super_block *); 3671 extern void ext4_ext_release(struct super_block *); 3672 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3673 loff_t len); 3674 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3675 loff_t offset, ssize_t len); 3676 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle, 3677 ext4_io_end_t *io_end); 3678 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3679 struct ext4_map_blocks *map, int flags); 3680 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3681 int num, 3682 struct ext4_ext_path *path); 3683 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3684 struct ext4_ext_path **, 3685 struct ext4_extent *, int); 3686 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3687 struct ext4_ext_path **, 3688 int flags); 3689 extern void ext4_free_ext_path(struct ext4_ext_path *); 3690 extern int ext4_ext_check_inode(struct inode *inode); 3691 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3692 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3693 __u64 start, __u64 len); 3694 extern int ext4_get_es_cache(struct inode *inode, 3695 struct fiemap_extent_info *fieinfo, 3696 __u64 start, __u64 len); 3697 extern int ext4_ext_precache(struct inode *inode); 3698 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3699 struct inode *inode2, ext4_lblk_t lblk1, 3700 ext4_lblk_t lblk2, ext4_lblk_t count, 3701 int mark_unwritten,int *err); 3702 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu); 3703 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode, 3704 int check_cred, int restart_cred, 3705 int revoke_cred); 3706 extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end); 3707 extern int ext4_ext_replay_set_iblocks(struct inode *inode); 3708 extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start, 3709 int len, int unwritten, ext4_fsblk_t pblk); 3710 extern int ext4_ext_clear_bb(struct inode *inode); 3711 3712 3713 /* move_extent.c */ 3714 extern void ext4_double_down_write_data_sem(struct inode *first, 3715 struct inode *second); 3716 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3717 struct inode *donor_inode); 3718 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3719 __u64 start_orig, __u64 start_donor, 3720 __u64 len, __u64 *moved_len); 3721 3722 /* page-io.c */ 3723 extern int __init ext4_init_pageio(void); 3724 extern void ext4_exit_pageio(void); 3725 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3726 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3727 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3728 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3729 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3730 struct writeback_control *wbc); 3731 extern void ext4_end_io_rsv_work(struct work_struct *work); 3732 extern void ext4_io_submit(struct ext4_io_submit *io); 3733 int ext4_bio_write_folio(struct ext4_io_submit *io, struct folio *page, 3734 size_t len); 3735 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end); 3736 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end); 3737 3738 /* mmp.c */ 3739 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3740 3741 /* mmp.c */ 3742 extern void ext4_stop_mmpd(struct ext4_sb_info *sbi); 3743 3744 /* verity.c */ 3745 extern const struct fsverity_operations ext4_verityops; 3746 3747 /* orphan.c */ 3748 extern int ext4_orphan_add(handle_t *, struct inode *); 3749 extern int ext4_orphan_del(handle_t *, struct inode *); 3750 extern void ext4_orphan_cleanup(struct super_block *sb, 3751 struct ext4_super_block *es); 3752 extern void ext4_release_orphan_info(struct super_block *sb); 3753 extern int ext4_init_orphan_info(struct super_block *sb); 3754 extern int ext4_orphan_file_empty(struct super_block *sb); 3755 extern void ext4_orphan_file_block_trigger( 3756 struct jbd2_buffer_trigger_type *triggers, 3757 struct buffer_head *bh, 3758 void *data, size_t size); 3759 3760 /* 3761 * Add new method to test whether block and inode bitmaps are properly 3762 * initialized. With uninit_bg reading the block from disk is not enough 3763 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3764 */ 3765 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3766 3767 static inline int bitmap_uptodate(struct buffer_head *bh) 3768 { 3769 return (buffer_uptodate(bh) && 3770 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3771 } 3772 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3773 { 3774 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3775 } 3776 3777 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3778 3779 /* For ioend & aio unwritten conversion wait queues */ 3780 #define EXT4_WQ_HASH_SZ 37 3781 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3782 EXT4_WQ_HASH_SZ]) 3783 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3784 3785 extern int ext4_resize_begin(struct super_block *sb); 3786 extern int ext4_resize_end(struct super_block *sb, bool update_backups); 3787 3788 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 3789 struct ext4_io_end *io_end) 3790 { 3791 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 3792 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3793 atomic_inc(&EXT4_I(inode)->i_unwritten); 3794 } 3795 } 3796 3797 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3798 { 3799 struct inode *inode = io_end->inode; 3800 3801 if (io_end->flag & EXT4_IO_END_UNWRITTEN) { 3802 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3803 /* Wake up anyone waiting on unwritten extent conversion */ 3804 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) 3805 wake_up_all(ext4_ioend_wq(inode)); 3806 } 3807 } 3808 3809 extern const struct iomap_ops ext4_iomap_ops; 3810 extern const struct iomap_ops ext4_iomap_overwrite_ops; 3811 extern const struct iomap_ops ext4_iomap_report_ops; 3812 3813 static inline int ext4_buffer_uptodate(struct buffer_head *bh) 3814 { 3815 /* 3816 * If the buffer has the write error flag, we have failed 3817 * to write out data in the block. In this case, we don't 3818 * have to read the block because we may read the old data 3819 * successfully. 3820 */ 3821 if (buffer_write_io_error(bh)) 3822 set_buffer_uptodate(bh); 3823 return buffer_uptodate(bh); 3824 } 3825 3826 #endif /* __KERNEL__ */ 3827 3828 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3829 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3830 3831 #endif /* _EXT4_H */ 3832