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 44 #include <linux/fscrypt.h> 45 #include <linux/fsverity.h> 46 47 #include <linux/compiler.h> 48 49 /* 50 * The fourth extended filesystem constants/structures 51 */ 52 53 /* 54 * with AGGRESSIVE_CHECK allocator runs consistency checks over 55 * structures. these checks slow things down a lot 56 */ 57 #define AGGRESSIVE_CHECK__ 58 59 /* 60 * with DOUBLE_CHECK defined mballoc creates persistent in-core 61 * bitmaps, maintains and uses them to check for double allocations 62 */ 63 #define DOUBLE_CHECK__ 64 65 /* 66 * Define EXT4FS_DEBUG to produce debug messages 67 */ 68 #undef EXT4FS_DEBUG 69 70 /* 71 * Debug code 72 */ 73 #ifdef EXT4FS_DEBUG 74 #define ext4_debug(f, a...) \ 75 do { \ 76 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 77 __FILE__, __LINE__, __func__); \ 78 printk(KERN_DEBUG f, ## a); \ 79 } while (0) 80 #else 81 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 82 #endif 83 84 /* 85 * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c 86 */ 87 #define EXT_DEBUG__ 88 89 /* 90 * Dynamic printk for controlled extents debugging. 91 */ 92 #ifdef CONFIG_EXT4_DEBUG 93 #define ext_debug(ino, fmt, ...) \ 94 pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt, \ 95 current->comm, task_pid_nr(current), \ 96 ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__, \ 97 __func__, ##__VA_ARGS__) 98 #else 99 #define ext_debug(ino, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 100 #endif 101 102 #define ASSERT(assert) \ 103 do { \ 104 if (unlikely(!(assert))) { \ 105 printk(KERN_EMERG \ 106 "Assertion failure in %s() at %s:%d: '%s'\n", \ 107 __func__, __FILE__, __LINE__, #assert); \ 108 BUG(); \ 109 } \ 110 } while (0) 111 112 /* data type for block offset of block group */ 113 typedef int ext4_grpblk_t; 114 115 /* data type for filesystem-wide blocks number */ 116 typedef unsigned long long ext4_fsblk_t; 117 118 /* data type for file logical block number */ 119 typedef __u32 ext4_lblk_t; 120 121 /* data type for block group number */ 122 typedef unsigned int ext4_group_t; 123 124 enum SHIFT_DIRECTION { 125 SHIFT_LEFT = 0, 126 SHIFT_RIGHT, 127 }; 128 129 /* 130 * Flags used in mballoc's allocation_context flags field. 131 * 132 * Also used to show what's going on for debugging purposes when the 133 * flag field is exported via the traceport interface 134 */ 135 136 /* prefer goal again. length */ 137 #define EXT4_MB_HINT_MERGE 0x0001 138 /* blocks already reserved */ 139 #define EXT4_MB_HINT_RESERVED 0x0002 140 /* metadata is being allocated */ 141 #define EXT4_MB_HINT_METADATA 0x0004 142 /* first blocks in the file */ 143 #define EXT4_MB_HINT_FIRST 0x0008 144 /* search for the best chunk */ 145 #define EXT4_MB_HINT_BEST 0x0010 146 /* data is being allocated */ 147 #define EXT4_MB_HINT_DATA 0x0020 148 /* don't preallocate (for tails) */ 149 #define EXT4_MB_HINT_NOPREALLOC 0x0040 150 /* allocate for locality group */ 151 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 152 /* allocate goal blocks or none */ 153 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 154 /* goal is meaningful */ 155 #define EXT4_MB_HINT_TRY_GOAL 0x0200 156 /* blocks already pre-reserved by delayed allocation */ 157 #define EXT4_MB_DELALLOC_RESERVED 0x0400 158 /* We are doing stream allocation */ 159 #define EXT4_MB_STREAM_ALLOC 0x0800 160 /* Use reserved root blocks if needed */ 161 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 162 /* Use blocks from reserved pool */ 163 #define EXT4_MB_USE_RESERVED 0x2000 164 /* Do strict check for free blocks while retrying block allocation */ 165 #define EXT4_MB_STRICT_CHECK 0x4000 166 /* Large fragment size list lookup succeeded at least once for cr = 0 */ 167 #define EXT4_MB_CR0_OPTIMIZED 0x8000 168 /* Avg fragment size rb tree lookup succeeded at least once for cr = 1 */ 169 #define EXT4_MB_CR1_OPTIMIZED 0x00010000 170 /* Perform linear traversal for one group */ 171 #define EXT4_MB_SEARCH_NEXT_LINEAR 0x00020000 172 struct ext4_allocation_request { 173 /* target inode for block we're allocating */ 174 struct inode *inode; 175 /* how many blocks we want to allocate */ 176 unsigned int len; 177 /* logical block in target inode */ 178 ext4_lblk_t logical; 179 /* the closest logical allocated block to the left */ 180 ext4_lblk_t lleft; 181 /* the closest logical allocated block to the right */ 182 ext4_lblk_t lright; 183 /* phys. target (a hint) */ 184 ext4_fsblk_t goal; 185 /* phys. block for the closest logical allocated block to the left */ 186 ext4_fsblk_t pleft; 187 /* phys. block for the closest logical allocated block to the right */ 188 ext4_fsblk_t pright; 189 /* flags. see above EXT4_MB_HINT_* */ 190 unsigned int flags; 191 }; 192 193 /* 194 * Logical to physical block mapping, used by ext4_map_blocks() 195 * 196 * This structure is used to pass requests into ext4_map_blocks() as 197 * well as to store the information returned by ext4_map_blocks(). It 198 * takes less room on the stack than a struct buffer_head. 199 */ 200 #define EXT4_MAP_NEW BIT(BH_New) 201 #define EXT4_MAP_MAPPED BIT(BH_Mapped) 202 #define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten) 203 #define EXT4_MAP_BOUNDARY BIT(BH_Boundary) 204 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 205 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 206 207 struct ext4_map_blocks { 208 ext4_fsblk_t m_pblk; 209 ext4_lblk_t m_lblk; 210 unsigned int m_len; 211 unsigned int m_flags; 212 }; 213 214 /* 215 * Block validity checking, system zone rbtree. 216 */ 217 struct ext4_system_blocks { 218 struct rb_root root; 219 struct rcu_head rcu; 220 }; 221 222 /* 223 * Flags for ext4_io_end->flags 224 */ 225 #define EXT4_IO_END_UNWRITTEN 0x0001 226 227 struct ext4_io_end_vec { 228 struct list_head list; /* list of io_end_vec */ 229 loff_t offset; /* offset in the file */ 230 ssize_t size; /* size of the extent */ 231 }; 232 233 /* 234 * For converting unwritten extents on a work queue. 'handle' is used for 235 * buffered writeback. 236 */ 237 typedef struct ext4_io_end { 238 struct list_head list; /* per-file finished IO list */ 239 handle_t *handle; /* handle reserved for extent 240 * conversion */ 241 struct inode *inode; /* file being written to */ 242 struct bio *bio; /* Linked list of completed 243 * bios covering the extent */ 244 unsigned int flag; /* unwritten or not */ 245 refcount_t count; /* reference counter */ 246 struct list_head list_vec; /* list of ext4_io_end_vec */ 247 } ext4_io_end_t; 248 249 struct ext4_io_submit { 250 struct writeback_control *io_wbc; 251 struct bio *io_bio; 252 ext4_io_end_t *io_end; 253 sector_t io_next_block; 254 }; 255 256 /* 257 * Special inodes numbers 258 */ 259 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 260 #define EXT4_ROOT_INO 2 /* Root inode */ 261 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 262 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 263 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 264 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 265 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 266 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 267 268 /* First non-reserved inode for old ext4 filesystems */ 269 #define EXT4_GOOD_OLD_FIRST_INO 11 270 271 /* 272 * Maximal count of links to a file 273 */ 274 #define EXT4_LINK_MAX 65000 275 276 /* 277 * Macro-instructions used to manage several block sizes 278 */ 279 #define EXT4_MIN_BLOCK_SIZE 1024 280 #define EXT4_MAX_BLOCK_SIZE 65536 281 #define EXT4_MIN_BLOCK_LOG_SIZE 10 282 #define EXT4_MAX_BLOCK_LOG_SIZE 16 283 #define EXT4_MAX_CLUSTER_LOG_SIZE 30 284 #ifdef __KERNEL__ 285 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 286 #else 287 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 288 #endif 289 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 290 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 291 EXT4_SB(s)->s_cluster_bits) 292 #ifdef __KERNEL__ 293 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 294 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 295 #else 296 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 297 #endif 298 #ifdef __KERNEL__ 299 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 300 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 301 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 302 #else 303 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 304 EXT4_GOOD_OLD_INODE_SIZE : \ 305 (s)->s_inode_size) 306 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 307 EXT4_GOOD_OLD_FIRST_INO : \ 308 (s)->s_first_ino) 309 #endif 310 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 311 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \ 312 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \ 313 blkbits)) 314 315 /* Translate a block number to a cluster number */ 316 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 317 /* Translate a cluster number to a block number */ 318 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 319 /* Translate # of blks to # of clusters */ 320 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 321 (sbi)->s_cluster_bits) 322 /* Mask out the low bits to get the starting block of the cluster */ 323 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 324 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 325 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 326 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 327 /* Fill in the low bits to get the last block of the cluster */ 328 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \ 329 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1)) 330 /* Get the cluster offset */ 331 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 332 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 333 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 334 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 335 336 /* 337 * Structure of a blocks group descriptor 338 */ 339 struct ext4_group_desc 340 { 341 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 342 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 343 __le32 bg_inode_table_lo; /* Inodes table block */ 344 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 345 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 346 __le16 bg_used_dirs_count_lo; /* Directories count */ 347 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 348 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 349 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 350 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 351 __le16 bg_itable_unused_lo; /* Unused inodes count */ 352 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 353 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 354 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 355 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 356 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 357 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 358 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 359 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 360 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 361 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 362 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 363 __u32 bg_reserved; 364 }; 365 366 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 367 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 368 sizeof(__le16)) 369 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 370 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 371 sizeof(__le16)) 372 373 /* 374 * Structure of a flex block group info 375 */ 376 377 struct flex_groups { 378 atomic64_t free_clusters; 379 atomic_t free_inodes; 380 atomic_t used_dirs; 381 }; 382 383 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 384 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 385 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 386 387 /* 388 * Macro-instructions used to manage group descriptors 389 */ 390 #define EXT4_MIN_DESC_SIZE 32 391 #define EXT4_MIN_DESC_SIZE_64BIT 64 392 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 393 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 394 #ifdef __KERNEL__ 395 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 396 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 397 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 398 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 399 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 400 #else 401 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 402 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 403 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 404 #endif 405 406 /* 407 * Constants relative to the data blocks 408 */ 409 #define EXT4_NDIR_BLOCKS 12 410 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 411 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 412 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 413 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 414 415 /* 416 * Inode flags 417 */ 418 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 419 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 420 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 421 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 422 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 423 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 424 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 425 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 426 /* Reserved for compression usage... */ 427 #define EXT4_DIRTY_FL 0x00000100 428 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 429 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 430 /* nb: was previously EXT2_ECOMPR_FL */ 431 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 432 /* End compression flags --- maybe not all used */ 433 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 434 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 435 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 436 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 437 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 438 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 439 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 440 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 441 #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */ 442 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 443 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */ 444 445 #define EXT4_DAX_FL 0x02000000 /* Inode is DAX */ 446 447 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 448 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 449 #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */ 450 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 451 452 /* User modifiable flags */ 453 #define EXT4_FL_USER_MODIFIABLE (EXT4_SECRM_FL | \ 454 EXT4_UNRM_FL | \ 455 EXT4_COMPR_FL | \ 456 EXT4_SYNC_FL | \ 457 EXT4_IMMUTABLE_FL | \ 458 EXT4_APPEND_FL | \ 459 EXT4_NODUMP_FL | \ 460 EXT4_NOATIME_FL | \ 461 EXT4_JOURNAL_DATA_FL | \ 462 EXT4_NOTAIL_FL | \ 463 EXT4_DIRSYNC_FL | \ 464 EXT4_TOPDIR_FL | \ 465 EXT4_EXTENTS_FL | \ 466 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \ 467 EXT4_DAX_FL | \ 468 EXT4_PROJINHERIT_FL | \ 469 EXT4_CASEFOLD_FL) 470 471 /* User visible flags */ 472 #define EXT4_FL_USER_VISIBLE (EXT4_FL_USER_MODIFIABLE | \ 473 EXT4_DIRTY_FL | \ 474 EXT4_COMPRBLK_FL | \ 475 EXT4_NOCOMPR_FL | \ 476 EXT4_ENCRYPT_FL | \ 477 EXT4_INDEX_FL | \ 478 EXT4_VERITY_FL | \ 479 EXT4_INLINE_DATA_FL) 480 481 /* Flags that should be inherited by new inodes from their parent. */ 482 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 483 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 484 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 485 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 486 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\ 487 EXT4_DAX_FL) 488 489 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 490 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\ 491 EXT4_PROJINHERIT_FL)) 492 493 /* Flags that are appropriate for non-directories/regular files. */ 494 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 495 496 /* The only flags that should be swapped */ 497 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL) 498 499 /* Flags which are mutually exclusive to DAX */ 500 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\ 501 EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL) 502 503 /* Mask out flags that are inappropriate for the given type of inode. */ 504 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 505 { 506 if (S_ISDIR(mode)) 507 return flags; 508 else if (S_ISREG(mode)) 509 return flags & EXT4_REG_FLMASK; 510 else 511 return flags & EXT4_OTHER_FLMASK; 512 } 513 514 /* 515 * Inode flags used for atomic set/get 516 */ 517 enum { 518 EXT4_INODE_SECRM = 0, /* Secure deletion */ 519 EXT4_INODE_UNRM = 1, /* Undelete */ 520 EXT4_INODE_COMPR = 2, /* Compress file */ 521 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 522 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 523 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 524 EXT4_INODE_NODUMP = 6, /* do not dump file */ 525 EXT4_INODE_NOATIME = 7, /* do not update atime */ 526 /* Reserved for compression usage... */ 527 EXT4_INODE_DIRTY = 8, 528 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 529 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 530 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 531 /* End compression flags --- maybe not all used */ 532 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 533 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 534 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 535 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 536 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 537 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 538 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 539 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 540 EXT4_INODE_VERITY = 20, /* Verity protected inode */ 541 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 542 /* 22 was formerly EXT4_INODE_EOFBLOCKS */ 543 EXT4_INODE_DAX = 25, /* Inode is DAX */ 544 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 545 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 546 EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */ 547 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 548 }; 549 550 /* 551 * Since it's pretty easy to mix up bit numbers and hex values, we use a 552 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 553 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 554 * any extra space in the compiled kernel image, otherwise, the build will fail. 555 * It's important that these values are the same, since we are using 556 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 557 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 558 * values found in ext2, ext3 and ext4 filesystems, and of course the values 559 * defined in e2fsprogs. 560 * 561 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 562 */ 563 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 564 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 565 566 static inline void ext4_check_flag_values(void) 567 { 568 CHECK_FLAG_VALUE(SECRM); 569 CHECK_FLAG_VALUE(UNRM); 570 CHECK_FLAG_VALUE(COMPR); 571 CHECK_FLAG_VALUE(SYNC); 572 CHECK_FLAG_VALUE(IMMUTABLE); 573 CHECK_FLAG_VALUE(APPEND); 574 CHECK_FLAG_VALUE(NODUMP); 575 CHECK_FLAG_VALUE(NOATIME); 576 CHECK_FLAG_VALUE(DIRTY); 577 CHECK_FLAG_VALUE(COMPRBLK); 578 CHECK_FLAG_VALUE(NOCOMPR); 579 CHECK_FLAG_VALUE(ENCRYPT); 580 CHECK_FLAG_VALUE(INDEX); 581 CHECK_FLAG_VALUE(IMAGIC); 582 CHECK_FLAG_VALUE(JOURNAL_DATA); 583 CHECK_FLAG_VALUE(NOTAIL); 584 CHECK_FLAG_VALUE(DIRSYNC); 585 CHECK_FLAG_VALUE(TOPDIR); 586 CHECK_FLAG_VALUE(HUGE_FILE); 587 CHECK_FLAG_VALUE(EXTENTS); 588 CHECK_FLAG_VALUE(VERITY); 589 CHECK_FLAG_VALUE(EA_INODE); 590 CHECK_FLAG_VALUE(INLINE_DATA); 591 CHECK_FLAG_VALUE(PROJINHERIT); 592 CHECK_FLAG_VALUE(CASEFOLD); 593 CHECK_FLAG_VALUE(RESERVED); 594 } 595 596 /* Used to pass group descriptor data when online resize is done */ 597 struct ext4_new_group_input { 598 __u32 group; /* Group number for this data */ 599 __u64 block_bitmap; /* Absolute block number of block bitmap */ 600 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 601 __u64 inode_table; /* Absolute block number of inode table start */ 602 __u32 blocks_count; /* Total number of blocks in this group */ 603 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 604 __u16 unused; 605 }; 606 607 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 608 struct compat_ext4_new_group_input { 609 u32 group; 610 compat_u64 block_bitmap; 611 compat_u64 inode_bitmap; 612 compat_u64 inode_table; 613 u32 blocks_count; 614 u16 reserved_blocks; 615 u16 unused; 616 }; 617 #endif 618 619 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 620 struct ext4_new_group_data { 621 __u32 group; 622 __u64 block_bitmap; 623 __u64 inode_bitmap; 624 __u64 inode_table; 625 __u32 blocks_count; 626 __u16 reserved_blocks; 627 __u16 mdata_blocks; 628 __u32 free_clusters_count; 629 }; 630 631 /* Indexes used to index group tables in ext4_new_group_data */ 632 enum { 633 BLOCK_BITMAP = 0, /* block bitmap */ 634 INODE_BITMAP, /* inode bitmap */ 635 INODE_TABLE, /* inode tables */ 636 GROUP_TABLE_COUNT, 637 }; 638 639 /* 640 * Flags used by ext4_map_blocks() 641 */ 642 /* Allocate any needed blocks and/or convert an unwritten 643 extent to be an initialized ext4 */ 644 #define EXT4_GET_BLOCKS_CREATE 0x0001 645 /* Request the creation of an unwritten extent */ 646 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 647 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 648 EXT4_GET_BLOCKS_CREATE) 649 /* Caller is from the delayed allocation writeout path 650 * finally doing the actual allocation of delayed blocks */ 651 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 652 /* caller is from the direct IO path, request to creation of an 653 unwritten extents if not allocated, split the unwritten 654 extent if blocks has been preallocated already*/ 655 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 656 #define EXT4_GET_BLOCKS_CONVERT 0x0010 657 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 658 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 659 /* Convert extent to initialized after IO complete */ 660 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 661 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 662 /* Eventual metadata allocation (due to growing extent tree) 663 * should not fail, so try to use reserved blocks for that.*/ 664 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 665 /* Don't normalize allocation size (used for fallocate) */ 666 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 667 /* Convert written extents to unwritten */ 668 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 669 /* Write zeros to newly created written extents */ 670 #define EXT4_GET_BLOCKS_ZERO 0x0200 671 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 672 EXT4_GET_BLOCKS_ZERO) 673 /* Caller will submit data before dropping transaction handle. This 674 * allows jbd2 to avoid submitting data before commit. */ 675 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 676 677 /* 678 * The bit position of these flags must not overlap with any of the 679 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 680 * read_extent_tree_block(), ext4_split_extent_at(), 681 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 682 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 683 * caching the extents when reading from the extent tree while a 684 * truncate or punch hole operation is in progress. 685 */ 686 #define EXT4_EX_NOCACHE 0x40000000 687 #define EXT4_EX_FORCE_CACHE 0x20000000 688 #define EXT4_EX_NOFAIL 0x10000000 689 690 /* 691 * Flags used by ext4_free_blocks 692 */ 693 #define EXT4_FREE_BLOCKS_METADATA 0x0001 694 #define EXT4_FREE_BLOCKS_FORGET 0x0002 695 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 696 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 697 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 698 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 699 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040 700 701 /* 702 * ioctl commands 703 */ 704 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 705 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 706 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 707 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 708 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 709 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 710 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 711 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 712 #define EXT4_IOC_MIGRATE _IO('f', 9) 713 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 714 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 715 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 716 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 717 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 718 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 719 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 720 /* ioctl codes 19--39 are reserved for fscrypt */ 721 #define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40) 722 #define EXT4_IOC_GETSTATE _IOW('f', 41, __u32) 723 #define EXT4_IOC_GET_ES_CACHE _IOWR('f', 42, struct fiemap) 724 #define EXT4_IOC_CHECKPOINT _IOW('f', 43, __u32) 725 726 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32) 727 728 /* 729 * Flags for going down operation 730 */ 731 #define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */ 732 #define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */ 733 #define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */ 734 735 /* 736 * Flags returned by EXT4_IOC_GETSTATE 737 * 738 * We only expose to userspace a subset of the state flags in 739 * i_state_flags 740 */ 741 #define EXT4_STATE_FLAG_EXT_PRECACHED 0x00000001 742 #define EXT4_STATE_FLAG_NEW 0x00000002 743 #define EXT4_STATE_FLAG_NEWENTRY 0x00000004 744 #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE 0x00000008 745 746 /* flags for ioctl EXT4_IOC_CHECKPOINT */ 747 #define EXT4_IOC_CHECKPOINT_FLAG_DISCARD 0x1 748 #define EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT 0x2 749 #define EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN 0x4 750 #define EXT4_IOC_CHECKPOINT_FLAG_VALID (EXT4_IOC_CHECKPOINT_FLAG_DISCARD | \ 751 EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT | \ 752 EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN) 753 754 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 755 /* 756 * ioctl commands in 32 bit emulation 757 */ 758 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 759 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 760 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 761 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 762 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 763 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 764 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 765 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 766 #endif 767 768 /* 769 * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag. 770 * It indicates that the entry in extent status cache is for a hole. 771 */ 772 #define EXT4_FIEMAP_EXTENT_HOLE 0x08000000 773 774 /* Max physical block we can address w/o extents */ 775 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 776 777 /* Max logical block we can support */ 778 #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE 779 780 /* 781 * Structure of an inode on the disk 782 */ 783 struct ext4_inode { 784 __le16 i_mode; /* File mode */ 785 __le16 i_uid; /* Low 16 bits of Owner Uid */ 786 __le32 i_size_lo; /* Size in bytes */ 787 __le32 i_atime; /* Access time */ 788 __le32 i_ctime; /* Inode Change time */ 789 __le32 i_mtime; /* Modification time */ 790 __le32 i_dtime; /* Deletion Time */ 791 __le16 i_gid; /* Low 16 bits of Group Id */ 792 __le16 i_links_count; /* Links count */ 793 __le32 i_blocks_lo; /* Blocks count */ 794 __le32 i_flags; /* File flags */ 795 union { 796 struct { 797 __le32 l_i_version; 798 } linux1; 799 struct { 800 __u32 h_i_translator; 801 } hurd1; 802 struct { 803 __u32 m_i_reserved1; 804 } masix1; 805 } osd1; /* OS dependent 1 */ 806 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 807 __le32 i_generation; /* File version (for NFS) */ 808 __le32 i_file_acl_lo; /* File ACL */ 809 __le32 i_size_high; 810 __le32 i_obso_faddr; /* Obsoleted fragment address */ 811 union { 812 struct { 813 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 814 __le16 l_i_file_acl_high; 815 __le16 l_i_uid_high; /* these 2 fields */ 816 __le16 l_i_gid_high; /* were reserved2[0] */ 817 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 818 __le16 l_i_reserved; 819 } linux2; 820 struct { 821 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 822 __u16 h_i_mode_high; 823 __u16 h_i_uid_high; 824 __u16 h_i_gid_high; 825 __u32 h_i_author; 826 } hurd2; 827 struct { 828 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 829 __le16 m_i_file_acl_high; 830 __u32 m_i_reserved2[2]; 831 } masix2; 832 } osd2; /* OS dependent 2 */ 833 __le16 i_extra_isize; 834 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 835 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 836 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 837 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 838 __le32 i_crtime; /* File Creation time */ 839 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 840 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 841 __le32 i_projid; /* Project ID */ 842 }; 843 844 struct move_extent { 845 __u32 reserved; /* should be zero */ 846 __u32 donor_fd; /* donor file descriptor */ 847 __u64 orig_start; /* logical start offset in block for orig */ 848 __u64 donor_start; /* logical start offset in block for donor */ 849 __u64 len; /* block length to be moved */ 850 __u64 moved_len; /* moved block length */ 851 }; 852 853 #define EXT4_EPOCH_BITS 2 854 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 855 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 856 857 /* 858 * Extended fields will fit into an inode if the filesystem was formatted 859 * with large inodes (-I 256 or larger) and there are not currently any EAs 860 * consuming all of the available space. For new inodes we always reserve 861 * enough space for the kernel's known extended fields, but for inodes 862 * created with an old kernel this might not have been the case. None of 863 * the extended inode fields is critical for correct filesystem operation. 864 * This macro checks if a certain field fits in the inode. Note that 865 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 866 */ 867 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 868 ((offsetof(typeof(*ext4_inode), field) + \ 869 sizeof((ext4_inode)->field)) \ 870 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 871 (einode)->i_extra_isize)) \ 872 873 /* 874 * We use an encoding that preserves the times for extra epoch "00": 875 * 876 * extra msb of adjust for signed 877 * epoch 32-bit 32-bit tv_sec to 878 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 879 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 880 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 881 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 882 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 883 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 884 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 885 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 886 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 887 * 888 * Note that previous versions of the kernel on 64-bit systems would 889 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 890 * 1970. e2fsck will correct this, assuming that it is run on the 891 * affected filesystem before 2242. 892 */ 893 894 static inline __le32 ext4_encode_extra_time(struct timespec64 *time) 895 { 896 u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK; 897 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); 898 } 899 900 static inline void ext4_decode_extra_time(struct timespec64 *time, 901 __le32 extra) 902 { 903 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) 904 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 905 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 906 } 907 908 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 909 do { \ 910 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\ 911 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 912 (raw_inode)->xtime ## _extra = \ 913 ext4_encode_extra_time(&(inode)->xtime); \ 914 } \ 915 else \ 916 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX)); \ 917 } while (0) 918 919 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 920 do { \ 921 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 922 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 923 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 924 (raw_inode)->xtime ## _extra = \ 925 ext4_encode_extra_time(&(einode)->xtime); \ 926 } while (0) 927 928 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 929 do { \ 930 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 931 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \ 932 ext4_decode_extra_time(&(inode)->xtime, \ 933 raw_inode->xtime ## _extra); \ 934 } \ 935 else \ 936 (inode)->xtime.tv_nsec = 0; \ 937 } while (0) 938 939 940 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 941 do { \ 942 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 943 (einode)->xtime.tv_sec = \ 944 (signed)le32_to_cpu((raw_inode)->xtime); \ 945 else \ 946 (einode)->xtime.tv_sec = 0; \ 947 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 948 ext4_decode_extra_time(&(einode)->xtime, \ 949 raw_inode->xtime ## _extra); \ 950 else \ 951 (einode)->xtime.tv_nsec = 0; \ 952 } while (0) 953 954 #define i_disk_version osd1.linux1.l_i_version 955 956 #if defined(__KERNEL__) || defined(__linux__) 957 #define i_reserved1 osd1.linux1.l_i_reserved1 958 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 959 #define i_blocks_high osd2.linux2.l_i_blocks_high 960 #define i_uid_low i_uid 961 #define i_gid_low i_gid 962 #define i_uid_high osd2.linux2.l_i_uid_high 963 #define i_gid_high osd2.linux2.l_i_gid_high 964 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 965 966 #elif defined(__GNU__) 967 968 #define i_translator osd1.hurd1.h_i_translator 969 #define i_uid_high osd2.hurd2.h_i_uid_high 970 #define i_gid_high osd2.hurd2.h_i_gid_high 971 #define i_author osd2.hurd2.h_i_author 972 973 #elif defined(__masix__) 974 975 #define i_reserved1 osd1.masix1.m_i_reserved1 976 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 977 #define i_reserved2 osd2.masix2.m_i_reserved2 978 979 #endif /* defined(__KERNEL__) || defined(__linux__) */ 980 981 #include "extents_status.h" 982 #include "fast_commit.h" 983 984 /* 985 * Lock subclasses for i_data_sem in the ext4_inode_info structure. 986 * 987 * These are needed to avoid lockdep false positives when we need to 988 * allocate blocks to the quota inode during ext4_map_blocks(), while 989 * holding i_data_sem for a normal (non-quota) inode. Since we don't 990 * do quota tracking for the quota inode, this avoids deadlock (as 991 * well as infinite recursion, since it isn't turtles all the way 992 * down...) 993 * 994 * I_DATA_SEM_NORMAL - Used for most inodes 995 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode 996 * where the second inode has larger inode number 997 * than the first 998 * I_DATA_SEM_QUOTA - Used for quota inodes only 999 */ 1000 enum { 1001 I_DATA_SEM_NORMAL = 0, 1002 I_DATA_SEM_OTHER, 1003 I_DATA_SEM_QUOTA, 1004 }; 1005 1006 1007 /* 1008 * fourth extended file system inode data in memory 1009 */ 1010 struct ext4_inode_info { 1011 __le32 i_data[15]; /* unconverted */ 1012 __u32 i_dtime; 1013 ext4_fsblk_t i_file_acl; 1014 1015 /* 1016 * i_block_group is the number of the block group which contains 1017 * this file's inode. Constant across the lifetime of the inode, 1018 * it is used for making block allocation decisions - we try to 1019 * place a file's data blocks near its inode block, and new inodes 1020 * near to their parent directory's inode. 1021 */ 1022 ext4_group_t i_block_group; 1023 ext4_lblk_t i_dir_start_lookup; 1024 #if (BITS_PER_LONG < 64) 1025 unsigned long i_state_flags; /* Dynamic state flags */ 1026 #endif 1027 unsigned long i_flags; 1028 1029 /* 1030 * Extended attributes can be read independently of the main file 1031 * data. Taking i_mutex even when reading would cause contention 1032 * between readers of EAs and writers of regular file data, so 1033 * instead we synchronize on xattr_sem when reading or changing 1034 * EAs. 1035 */ 1036 struct rw_semaphore xattr_sem; 1037 1038 /* 1039 * Inodes with EXT4_STATE_ORPHAN_FILE use i_orphan_idx. Otherwise 1040 * i_orphan is used. 1041 */ 1042 union { 1043 struct list_head i_orphan; /* unlinked but open inodes */ 1044 unsigned int i_orphan_idx; /* Index in orphan file */ 1045 }; 1046 1047 /* Fast commit related info */ 1048 1049 struct list_head i_fc_list; /* 1050 * inodes that need fast commit 1051 * protected by sbi->s_fc_lock. 1052 */ 1053 1054 /* Start of lblk range that needs to be committed in this fast commit */ 1055 ext4_lblk_t i_fc_lblk_start; 1056 1057 /* End of lblk range that needs to be committed in this fast commit */ 1058 ext4_lblk_t i_fc_lblk_len; 1059 1060 /* Number of ongoing updates on this inode */ 1061 atomic_t i_fc_updates; 1062 1063 /* Fast commit wait queue for this inode */ 1064 wait_queue_head_t i_fc_wait; 1065 1066 /* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */ 1067 struct mutex i_fc_lock; 1068 1069 /* 1070 * i_disksize keeps track of what the inode size is ON DISK, not 1071 * in memory. During truncate, i_size is set to the new size by 1072 * the VFS prior to calling ext4_truncate(), but the filesystem won't 1073 * set i_disksize to 0 until the truncate is actually under way. 1074 * 1075 * The intent is that i_disksize always represents the blocks which 1076 * are used by this file. This allows recovery to restart truncate 1077 * on orphans if we crash during truncate. We actually write i_disksize 1078 * into the on-disk inode when writing inodes out, instead of i_size. 1079 * 1080 * The only time when i_disksize and i_size may be different is when 1081 * a truncate is in progress. The only things which change i_disksize 1082 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 1083 */ 1084 loff_t i_disksize; 1085 1086 /* 1087 * i_data_sem is for serialising ext4_truncate() against 1088 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 1089 * data tree are chopped off during truncate. We can't do that in 1090 * ext4 because whenever we perform intermediate commits during 1091 * truncate, the inode and all the metadata blocks *must* be in a 1092 * consistent state which allows truncation of the orphans to restart 1093 * during recovery. Hence we must fix the get_block-vs-truncate race 1094 * by other means, so we have i_data_sem. 1095 */ 1096 struct rw_semaphore i_data_sem; 1097 struct inode vfs_inode; 1098 struct jbd2_inode *jinode; 1099 1100 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 1101 1102 /* 1103 * File creation time. Its function is same as that of 1104 * struct timespec64 i_{a,c,m}time in the generic inode. 1105 */ 1106 struct timespec64 i_crtime; 1107 1108 /* mballoc */ 1109 atomic_t i_prealloc_active; 1110 struct list_head i_prealloc_list; 1111 spinlock_t i_prealloc_lock; 1112 1113 /* extents status tree */ 1114 struct ext4_es_tree i_es_tree; 1115 rwlock_t i_es_lock; 1116 struct list_head i_es_list; 1117 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1118 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1119 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1120 extents to shrink. Protected by 1121 i_es_lock */ 1122 1123 /* ialloc */ 1124 ext4_group_t i_last_alloc_group; 1125 1126 /* allocation reservation info for delalloc */ 1127 /* In case of bigalloc, this refer to clusters rather than blocks */ 1128 unsigned int i_reserved_data_blocks; 1129 1130 /* pending cluster reservations for bigalloc file systems */ 1131 struct ext4_pending_tree i_pending_tree; 1132 1133 /* on-disk additional length */ 1134 __u16 i_extra_isize; 1135 1136 /* Indicate the inline data space. */ 1137 u16 i_inline_off; 1138 u16 i_inline_size; 1139 1140 #ifdef CONFIG_QUOTA 1141 /* quota space reservation, managed internally by quota code */ 1142 qsize_t i_reserved_quota; 1143 #endif 1144 1145 /* Lock protecting lists below */ 1146 spinlock_t i_completed_io_lock; 1147 /* 1148 * Completed IOs that need unwritten extents handling and have 1149 * transaction reserved 1150 */ 1151 struct list_head i_rsv_conversion_list; 1152 struct work_struct i_rsv_conversion_work; 1153 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 1154 1155 spinlock_t i_block_reservation_lock; 1156 1157 /* 1158 * Transactions that contain inode's metadata needed to complete 1159 * fsync and fdatasync, respectively. 1160 */ 1161 tid_t i_sync_tid; 1162 tid_t i_datasync_tid; 1163 1164 #ifdef CONFIG_QUOTA 1165 struct dquot *i_dquot[MAXQUOTAS]; 1166 #endif 1167 1168 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1169 __u32 i_csum_seed; 1170 1171 kprojid_t i_projid; 1172 }; 1173 1174 /* 1175 * File system states 1176 */ 1177 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1178 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1179 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1180 #define EXT4_FC_REPLAY 0x0020 /* Fast commit replay ongoing */ 1181 1182 /* 1183 * Misc. filesystem flags 1184 */ 1185 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1186 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1187 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1188 1189 /* 1190 * Mount flags set via mount options or defaults 1191 */ 1192 #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */ 1193 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1194 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1195 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1196 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1197 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1198 #define EXT4_MOUNT_ERRORS_MASK 0x00070 1199 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1200 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1201 #ifdef CONFIG_FS_DAX 1202 #define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */ 1203 #else 1204 #define EXT4_MOUNT_DAX_ALWAYS 0 1205 #endif 1206 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1207 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1208 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1209 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1210 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1211 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1212 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1213 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1214 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1215 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1216 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */ 1217 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota, 1218 * enable enforcement for hidden 1219 * quota files */ 1220 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable 1221 * enforcement for hidden quota 1222 * files */ 1223 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota 1224 * enforcement */ 1225 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1226 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1227 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1228 #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */ 1229 #define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000 1230 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1231 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1232 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1233 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1234 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1235 1236 /* 1237 * Mount flags set either automatically (could not be set by mount option) 1238 * based on per file system feature or property or in special cases such as 1239 * distinguishing between explicit mount option definition and default. 1240 */ 1241 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1242 specified delalloc */ 1243 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1244 size of blocksize * 8 1245 blocks */ 1246 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1247 file systems */ 1248 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1249 specified journal checksum */ 1250 1251 #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */ 1252 #define EXT4_MOUNT2_DAX_NEVER 0x00000020 /* Do not allow Direct Access */ 1253 #define EXT4_MOUNT2_DAX_INODE 0x00000040 /* For printing options only */ 1254 #define EXT4_MOUNT2_MB_OPTIMIZE_SCAN 0x00000080 /* Optimize group 1255 * scanning in mballoc 1256 */ 1257 1258 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1259 ~EXT4_MOUNT_##opt 1260 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1261 EXT4_MOUNT_##opt 1262 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1263 EXT4_MOUNT_##opt) 1264 1265 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1266 ~EXT4_MOUNT2_##opt 1267 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1268 EXT4_MOUNT2_##opt 1269 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1270 EXT4_MOUNT2_##opt) 1271 1272 #define ext4_test_and_set_bit __test_and_set_bit_le 1273 #define ext4_set_bit __set_bit_le 1274 #define ext4_set_bit_atomic ext2_set_bit_atomic 1275 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1276 #define ext4_clear_bit __clear_bit_le 1277 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1278 #define ext4_test_bit test_bit_le 1279 #define ext4_find_next_zero_bit find_next_zero_bit_le 1280 #define ext4_find_next_bit find_next_bit_le 1281 1282 extern void ext4_set_bits(void *bm, int cur, int len); 1283 1284 /* 1285 * Maximal mount counts between two filesystem checks 1286 */ 1287 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1288 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1289 1290 /* 1291 * Behaviour when detecting errors 1292 */ 1293 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1294 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1295 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1296 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1297 1298 /* Metadata checksum algorithm codes */ 1299 #define EXT4_CRC32C_CHKSUM 1 1300 1301 /* 1302 * Structure of the super block 1303 */ 1304 struct ext4_super_block { 1305 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1306 __le32 s_blocks_count_lo; /* Blocks count */ 1307 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1308 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1309 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1310 __le32 s_first_data_block; /* First Data Block */ 1311 __le32 s_log_block_size; /* Block size */ 1312 __le32 s_log_cluster_size; /* Allocation cluster size */ 1313 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1314 __le32 s_clusters_per_group; /* # Clusters per group */ 1315 __le32 s_inodes_per_group; /* # Inodes per group */ 1316 __le32 s_mtime; /* Mount time */ 1317 /*30*/ __le32 s_wtime; /* Write time */ 1318 __le16 s_mnt_count; /* Mount count */ 1319 __le16 s_max_mnt_count; /* Maximal mount count */ 1320 __le16 s_magic; /* Magic signature */ 1321 __le16 s_state; /* File system state */ 1322 __le16 s_errors; /* Behaviour when detecting errors */ 1323 __le16 s_minor_rev_level; /* minor revision level */ 1324 /*40*/ __le32 s_lastcheck; /* time of last check */ 1325 __le32 s_checkinterval; /* max. time between checks */ 1326 __le32 s_creator_os; /* OS */ 1327 __le32 s_rev_level; /* Revision level */ 1328 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1329 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1330 /* 1331 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1332 * 1333 * Note: the difference between the compatible feature set and 1334 * the incompatible feature set is that if there is a bit set 1335 * in the incompatible feature set that the kernel doesn't 1336 * know about, it should refuse to mount the filesystem. 1337 * 1338 * e2fsck's requirements are more strict; if it doesn't know 1339 * about a feature in either the compatible or incompatible 1340 * feature set, it must abort and not try to meddle with 1341 * things it doesn't understand... 1342 */ 1343 __le32 s_first_ino; /* First non-reserved inode */ 1344 __le16 s_inode_size; /* size of inode structure */ 1345 __le16 s_block_group_nr; /* block group # of this superblock */ 1346 __le32 s_feature_compat; /* compatible feature set */ 1347 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1348 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1349 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1350 /*78*/ char s_volume_name[16]; /* volume name */ 1351 /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */ 1352 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1353 /* 1354 * Performance hints. Directory preallocation should only 1355 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1356 */ 1357 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1358 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1359 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1360 /* 1361 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1362 */ 1363 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1364 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1365 __le32 s_journal_dev; /* device number of journal file */ 1366 __le32 s_last_orphan; /* start of list of inodes to delete */ 1367 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1368 __u8 s_def_hash_version; /* Default hash version to use */ 1369 __u8 s_jnl_backup_type; 1370 __le16 s_desc_size; /* size of group descriptor */ 1371 /*100*/ __le32 s_default_mount_opts; 1372 __le32 s_first_meta_bg; /* First metablock block group */ 1373 __le32 s_mkfs_time; /* When the filesystem was created */ 1374 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1375 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1376 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1377 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1378 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1379 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1380 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1381 __le32 s_flags; /* Miscellaneous flags */ 1382 __le16 s_raid_stride; /* RAID stride */ 1383 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1384 __le64 s_mmp_block; /* Block for multi-mount protection */ 1385 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1386 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1387 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1388 __u8 s_encryption_level; /* versioning level for encryption */ 1389 __u8 s_reserved_pad; /* Padding to next 32bits */ 1390 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1391 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1392 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1393 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1394 snapshot's future use */ 1395 __le32 s_snapshot_list; /* inode number of the head of the 1396 on-disk snapshot list */ 1397 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1398 __le32 s_error_count; /* number of fs errors */ 1399 __le32 s_first_error_time; /* first time an error happened */ 1400 __le32 s_first_error_ino; /* inode involved in first error */ 1401 __le64 s_first_error_block; /* block involved of first error */ 1402 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */ 1403 __le32 s_first_error_line; /* line number where error happened */ 1404 __le32 s_last_error_time; /* most recent time of an error */ 1405 __le32 s_last_error_ino; /* inode involved in last error */ 1406 __le32 s_last_error_line; /* line number where error happened */ 1407 __le64 s_last_error_block; /* block involved of last error */ 1408 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */ 1409 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1410 __u8 s_mount_opts[64]; 1411 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1412 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1413 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1414 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1415 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1416 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1417 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1418 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1419 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1420 __u8 s_wtime_hi; 1421 __u8 s_mtime_hi; 1422 __u8 s_mkfs_time_hi; 1423 __u8 s_lastcheck_hi; 1424 __u8 s_first_error_time_hi; 1425 __u8 s_last_error_time_hi; 1426 __u8 s_first_error_errcode; 1427 __u8 s_last_error_errcode; 1428 __le16 s_encoding; /* Filename charset encoding */ 1429 __le16 s_encoding_flags; /* Filename charset encoding flags */ 1430 __le32 s_orphan_file_inum; /* Inode for tracking orphan inodes */ 1431 __le32 s_reserved[94]; /* Padding to the end of the block */ 1432 __le32 s_checksum; /* crc32c(superblock) */ 1433 }; 1434 1435 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1436 1437 #ifdef __KERNEL__ 1438 1439 #ifdef CONFIG_FS_ENCRYPTION 1440 #define DUMMY_ENCRYPTION_ENABLED(sbi) ((sbi)->s_dummy_enc_policy.policy != NULL) 1441 #else 1442 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0) 1443 #endif 1444 1445 /* Number of quota types we support */ 1446 #define EXT4_MAXQUOTAS 3 1447 1448 #define EXT4_ENC_UTF8_12_1 1 1449 1450 /* Types of ext4 journal triggers */ 1451 enum ext4_journal_trigger_type { 1452 EXT4_JTR_ORPHAN_FILE, 1453 EXT4_JTR_NONE /* This must be the last entry for indexing to work! */ 1454 }; 1455 1456 #define EXT4_JOURNAL_TRIGGER_COUNT EXT4_JTR_NONE 1457 1458 struct ext4_journal_trigger { 1459 struct jbd2_buffer_trigger_type tr_triggers; 1460 struct super_block *sb; 1461 }; 1462 1463 static inline struct ext4_journal_trigger *EXT4_TRIGGER( 1464 struct jbd2_buffer_trigger_type *trigger) 1465 { 1466 return container_of(trigger, struct ext4_journal_trigger, tr_triggers); 1467 } 1468 1469 #define EXT4_ORPHAN_BLOCK_MAGIC 0x0b10ca04 1470 1471 /* Structure at the tail of orphan block */ 1472 struct ext4_orphan_block_tail { 1473 __le32 ob_magic; 1474 __le32 ob_checksum; 1475 }; 1476 1477 static inline int ext4_inodes_per_orphan_block(struct super_block *sb) 1478 { 1479 return (sb->s_blocksize - sizeof(struct ext4_orphan_block_tail)) / 1480 sizeof(u32); 1481 } 1482 1483 struct ext4_orphan_block { 1484 atomic_t ob_free_entries; /* Number of free orphan entries in block */ 1485 struct buffer_head *ob_bh; /* Buffer for orphan block */ 1486 }; 1487 1488 /* 1489 * Info about orphan file. 1490 */ 1491 struct ext4_orphan_info { 1492 int of_blocks; /* Number of orphan blocks in a file */ 1493 __u32 of_csum_seed; /* Checksum seed for orphan file */ 1494 struct ext4_orphan_block *of_binfo; /* Array with info about orphan 1495 * file blocks */ 1496 }; 1497 1498 /* 1499 * fourth extended-fs super-block data in memory 1500 */ 1501 struct ext4_sb_info { 1502 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1503 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1504 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1505 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1506 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1507 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1508 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1509 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1510 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1511 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1512 unsigned long s_overhead; /* # of fs overhead clusters */ 1513 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1514 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1515 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1516 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1517 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1518 struct buffer_head * __rcu *s_group_desc; 1519 unsigned int s_mount_opt; 1520 unsigned int s_mount_opt2; 1521 unsigned long s_mount_flags; 1522 unsigned int s_def_mount_opt; 1523 ext4_fsblk_t s_sb_block; 1524 atomic64_t s_resv_clusters; 1525 kuid_t s_resuid; 1526 kgid_t s_resgid; 1527 unsigned short s_mount_state; 1528 unsigned short s_pad; 1529 int s_addr_per_block_bits; 1530 int s_desc_per_block_bits; 1531 int s_inode_size; 1532 int s_first_ino; 1533 unsigned int s_inode_readahead_blks; 1534 unsigned int s_inode_goal; 1535 u32 s_hash_seed[4]; 1536 int s_def_hash_version; 1537 int s_hash_unsigned; /* 3 if hash should be unsigned, 0 if not */ 1538 struct percpu_counter s_freeclusters_counter; 1539 struct percpu_counter s_freeinodes_counter; 1540 struct percpu_counter s_dirs_counter; 1541 struct percpu_counter s_dirtyclusters_counter; 1542 struct percpu_counter s_sra_exceeded_retry_limit; 1543 struct blockgroup_lock *s_blockgroup_lock; 1544 struct proc_dir_entry *s_proc; 1545 struct kobject s_kobj; 1546 struct completion s_kobj_unregister; 1547 struct super_block *s_sb; 1548 struct buffer_head *s_mmp_bh; 1549 1550 /* Journaling */ 1551 struct journal_s *s_journal; 1552 unsigned long s_ext4_flags; /* Ext4 superblock flags */ 1553 struct mutex s_orphan_lock; /* Protects on disk list changes */ 1554 struct list_head s_orphan; /* List of orphaned inodes in on disk 1555 list */ 1556 struct ext4_orphan_info s_orphan_info; 1557 unsigned long s_commit_interval; 1558 u32 s_max_batch_time; 1559 u32 s_min_batch_time; 1560 struct block_device *s_journal_bdev; 1561 #ifdef CONFIG_QUOTA 1562 /* Names of quota files with journalled quota */ 1563 char __rcu *s_qf_names[EXT4_MAXQUOTAS]; 1564 int s_jquota_fmt; /* Format of quota to use */ 1565 #endif 1566 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1567 struct ext4_system_blocks __rcu *s_system_blks; 1568 1569 #ifdef EXTENTS_STATS 1570 /* ext4 extents stats */ 1571 unsigned long s_ext_min; 1572 unsigned long s_ext_max; 1573 unsigned long s_depth_max; 1574 spinlock_t s_ext_stats_lock; 1575 unsigned long s_ext_blocks; 1576 unsigned long s_ext_extents; 1577 #endif 1578 1579 /* for buddy allocator */ 1580 struct ext4_group_info ** __rcu *s_group_info; 1581 struct inode *s_buddy_cache; 1582 spinlock_t s_md_lock; 1583 unsigned short *s_mb_offsets; 1584 unsigned int *s_mb_maxs; 1585 unsigned int s_group_info_size; 1586 unsigned int s_mb_free_pending; 1587 struct list_head s_freed_data_list; /* List of blocks to be freed 1588 after commit completed */ 1589 struct list_head s_discard_list; 1590 struct work_struct s_discard_work; 1591 atomic_t s_retry_alloc_pending; 1592 struct rb_root s_mb_avg_fragment_size_root; 1593 rwlock_t s_mb_rb_lock; 1594 struct list_head *s_mb_largest_free_orders; 1595 rwlock_t *s_mb_largest_free_orders_locks; 1596 1597 /* tunables */ 1598 unsigned long s_stripe; 1599 unsigned int s_mb_max_linear_groups; 1600 unsigned int s_mb_stream_request; 1601 unsigned int s_mb_max_to_scan; 1602 unsigned int s_mb_min_to_scan; 1603 unsigned int s_mb_stats; 1604 unsigned int s_mb_order2_reqs; 1605 unsigned int s_mb_group_prealloc; 1606 unsigned int s_mb_max_inode_prealloc; 1607 unsigned int s_max_dir_size_kb; 1608 /* where last allocation was done - for stream allocation */ 1609 unsigned long s_mb_last_group; 1610 unsigned long s_mb_last_start; 1611 unsigned int s_mb_prefetch; 1612 unsigned int s_mb_prefetch_limit; 1613 1614 /* stats for buddy allocator */ 1615 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1616 atomic_t s_bal_success; /* we found long enough chunks */ 1617 atomic_t s_bal_allocated; /* in blocks */ 1618 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1619 atomic_t s_bal_groups_scanned; /* number of groups scanned */ 1620 atomic_t s_bal_goals; /* goal hits */ 1621 atomic_t s_bal_breaks; /* too long searches */ 1622 atomic_t s_bal_2orders; /* 2^order hits */ 1623 atomic_t s_bal_cr0_bad_suggestions; 1624 atomic_t s_bal_cr1_bad_suggestions; 1625 atomic64_t s_bal_cX_groups_considered[4]; 1626 atomic64_t s_bal_cX_hits[4]; 1627 atomic64_t s_bal_cX_failed[4]; /* cX loop didn't find blocks */ 1628 atomic_t s_mb_buddies_generated; /* number of buddies generated */ 1629 atomic64_t s_mb_generation_time; 1630 atomic_t s_mb_lost_chunks; 1631 atomic_t s_mb_preallocated; 1632 atomic_t s_mb_discarded; 1633 atomic_t s_lock_busy; 1634 1635 /* locality groups */ 1636 struct ext4_locality_group __percpu *s_locality_groups; 1637 1638 /* for write statistics */ 1639 unsigned long s_sectors_written_start; 1640 u64 s_kbytes_written; 1641 1642 /* the size of zero-out chunk */ 1643 unsigned int s_extent_max_zeroout_kb; 1644 1645 unsigned int s_log_groups_per_flex; 1646 struct flex_groups * __rcu *s_flex_groups; 1647 ext4_group_t s_flex_groups_allocated; 1648 1649 /* workqueue for reserved extent conversions (buffered io) */ 1650 struct workqueue_struct *rsv_conversion_wq; 1651 1652 /* timer for periodic error stats printing */ 1653 struct timer_list s_err_report; 1654 1655 /* Lazy inode table initialization info */ 1656 struct ext4_li_request *s_li_request; 1657 /* Wait multiplier for lazy initialization thread */ 1658 unsigned int s_li_wait_mult; 1659 1660 /* Kernel thread for multiple mount protection */ 1661 struct task_struct *s_mmp_tsk; 1662 1663 /* record the last minlen when FITRIM is called. */ 1664 atomic_t s_last_trim_minblks; 1665 1666 /* Reference to checksum algorithm driver via cryptoapi */ 1667 struct crypto_shash *s_chksum_driver; 1668 1669 /* Precomputed FS UUID checksum for seeding other checksums */ 1670 __u32 s_csum_seed; 1671 1672 /* Reclaim extents from extent status tree */ 1673 struct shrinker s_es_shrinker; 1674 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1675 long s_es_nr_inode; 1676 struct ext4_es_stats s_es_stats; 1677 struct mb_cache *s_ea_block_cache; 1678 struct mb_cache *s_ea_inode_cache; 1679 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1680 1681 /* Journal triggers for checksum computation */ 1682 struct ext4_journal_trigger s_journal_triggers[EXT4_JOURNAL_TRIGGER_COUNT]; 1683 1684 /* Ratelimit ext4 messages. */ 1685 struct ratelimit_state s_err_ratelimit_state; 1686 struct ratelimit_state s_warning_ratelimit_state; 1687 struct ratelimit_state s_msg_ratelimit_state; 1688 atomic_t s_warning_count; 1689 atomic_t s_msg_count; 1690 1691 /* Encryption policy for '-o test_dummy_encryption' */ 1692 struct fscrypt_dummy_policy s_dummy_enc_policy; 1693 1694 /* 1695 * Barrier between writepages ops and changing any inode's JOURNAL_DATA 1696 * or EXTENTS flag. 1697 */ 1698 struct percpu_rw_semaphore s_writepages_rwsem; 1699 struct dax_device *s_daxdev; 1700 #ifdef CONFIG_EXT4_DEBUG 1701 unsigned long s_simulate_fail; 1702 #endif 1703 /* Record the errseq of the backing block device */ 1704 errseq_t s_bdev_wb_err; 1705 spinlock_t s_bdev_wb_lock; 1706 1707 /* Information about errors that happened during this mount */ 1708 spinlock_t s_error_lock; 1709 int s_add_error_count; 1710 int s_first_error_code; 1711 __u32 s_first_error_line; 1712 __u32 s_first_error_ino; 1713 __u64 s_first_error_block; 1714 const char *s_first_error_func; 1715 time64_t s_first_error_time; 1716 int s_last_error_code; 1717 __u32 s_last_error_line; 1718 __u32 s_last_error_ino; 1719 __u64 s_last_error_block; 1720 const char *s_last_error_func; 1721 time64_t s_last_error_time; 1722 /* 1723 * If we are in a context where we cannot update error information in 1724 * the on-disk superblock, we queue this work to do it. 1725 */ 1726 struct work_struct s_error_work; 1727 1728 /* Ext4 fast commit sub transaction ID */ 1729 atomic_t s_fc_subtid; 1730 1731 /* 1732 * After commit starts, the main queue gets locked, and the further 1733 * updates get added in the staging queue. 1734 */ 1735 #define FC_Q_MAIN 0 1736 #define FC_Q_STAGING 1 1737 struct list_head s_fc_q[2]; /* Inodes staged for fast commit 1738 * that have data changes in them. 1739 */ 1740 struct list_head s_fc_dentry_q[2]; /* directory entry updates */ 1741 unsigned int s_fc_bytes; 1742 /* 1743 * Main fast commit lock. This lock protects accesses to the 1744 * following fields: 1745 * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh. 1746 */ 1747 spinlock_t s_fc_lock; 1748 struct buffer_head *s_fc_bh; 1749 struct ext4_fc_stats s_fc_stats; 1750 #ifdef CONFIG_EXT4_DEBUG 1751 int s_fc_debug_max_replay; 1752 #endif 1753 struct ext4_fc_replay_state s_fc_replay_state; 1754 }; 1755 1756 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1757 { 1758 return sb->s_fs_info; 1759 } 1760 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1761 { 1762 return container_of(inode, struct ext4_inode_info, vfs_inode); 1763 } 1764 1765 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1766 { 1767 return ino == EXT4_ROOT_INO || 1768 (ino >= EXT4_FIRST_INO(sb) && 1769 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1770 } 1771 1772 /* 1773 * Returns: sbi->field[index] 1774 * Used to access an array element from the following sbi fields which require 1775 * rcu protection to avoid dereferencing an invalid pointer due to reassignment 1776 * - s_group_desc 1777 * - s_group_info 1778 * - s_flex_group 1779 */ 1780 #define sbi_array_rcu_deref(sbi, field, index) \ 1781 ({ \ 1782 typeof(*((sbi)->field)) _v; \ 1783 rcu_read_lock(); \ 1784 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \ 1785 rcu_read_unlock(); \ 1786 _v; \ 1787 }) 1788 1789 /* 1790 * run-time mount flags 1791 */ 1792 enum { 1793 EXT4_MF_MNTDIR_SAMPLED, 1794 EXT4_MF_FS_ABORTED, /* Fatal error detected */ 1795 EXT4_MF_FC_INELIGIBLE, /* Fast commit ineligible */ 1796 EXT4_MF_FC_COMMITTING /* File system underoing a fast 1797 * commit. 1798 */ 1799 }; 1800 1801 static inline void ext4_set_mount_flag(struct super_block *sb, int bit) 1802 { 1803 set_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1804 } 1805 1806 static inline void ext4_clear_mount_flag(struct super_block *sb, int bit) 1807 { 1808 clear_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1809 } 1810 1811 static inline int ext4_test_mount_flag(struct super_block *sb, int bit) 1812 { 1813 return test_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1814 } 1815 1816 1817 /* 1818 * Simulate_fail codes 1819 */ 1820 #define EXT4_SIM_BBITMAP_EIO 1 1821 #define EXT4_SIM_BBITMAP_CRC 2 1822 #define EXT4_SIM_IBITMAP_EIO 3 1823 #define EXT4_SIM_IBITMAP_CRC 4 1824 #define EXT4_SIM_INODE_EIO 5 1825 #define EXT4_SIM_INODE_CRC 6 1826 #define EXT4_SIM_DIRBLOCK_EIO 7 1827 #define EXT4_SIM_DIRBLOCK_CRC 8 1828 1829 static inline bool ext4_simulate_fail(struct super_block *sb, 1830 unsigned long code) 1831 { 1832 #ifdef CONFIG_EXT4_DEBUG 1833 struct ext4_sb_info *sbi = EXT4_SB(sb); 1834 1835 if (unlikely(sbi->s_simulate_fail == code)) { 1836 sbi->s_simulate_fail = 0; 1837 return true; 1838 } 1839 #endif 1840 return false; 1841 } 1842 1843 static inline void ext4_simulate_fail_bh(struct super_block *sb, 1844 struct buffer_head *bh, 1845 unsigned long code) 1846 { 1847 if (!IS_ERR(bh) && ext4_simulate_fail(sb, code)) 1848 clear_buffer_uptodate(bh); 1849 } 1850 1851 /* 1852 * Error number codes for s_{first,last}_error_errno 1853 * 1854 * Linux errno numbers are architecture specific, so we need to translate 1855 * them into something which is architecture independent. We don't define 1856 * codes for all errno's; just the ones which are most likely to be the cause 1857 * of an ext4_error() call. 1858 */ 1859 #define EXT4_ERR_UNKNOWN 1 1860 #define EXT4_ERR_EIO 2 1861 #define EXT4_ERR_ENOMEM 3 1862 #define EXT4_ERR_EFSBADCRC 4 1863 #define EXT4_ERR_EFSCORRUPTED 5 1864 #define EXT4_ERR_ENOSPC 6 1865 #define EXT4_ERR_ENOKEY 7 1866 #define EXT4_ERR_EROFS 8 1867 #define EXT4_ERR_EFBIG 9 1868 #define EXT4_ERR_EEXIST 10 1869 #define EXT4_ERR_ERANGE 11 1870 #define EXT4_ERR_EOVERFLOW 12 1871 #define EXT4_ERR_EBUSY 13 1872 #define EXT4_ERR_ENOTDIR 14 1873 #define EXT4_ERR_ENOTEMPTY 15 1874 #define EXT4_ERR_ESHUTDOWN 16 1875 #define EXT4_ERR_EFAULT 17 1876 1877 /* 1878 * Inode dynamic state flags 1879 */ 1880 enum { 1881 EXT4_STATE_JDATA, /* journaled data exists */ 1882 EXT4_STATE_NEW, /* inode is newly created */ 1883 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1884 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1885 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1886 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1887 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1888 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1889 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1890 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */ 1891 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */ 1892 EXT4_STATE_FC_COMMITTING, /* Fast commit ongoing */ 1893 EXT4_STATE_ORPHAN_FILE, /* Inode orphaned in orphan file */ 1894 }; 1895 1896 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1897 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1898 { \ 1899 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1900 } \ 1901 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1902 { \ 1903 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1904 } \ 1905 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1906 { \ 1907 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1908 } 1909 1910 /* Add these declarations here only so that these functions can be 1911 * found by name. Otherwise, they are very hard to locate. */ 1912 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1913 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1914 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1915 EXT4_INODE_BIT_FNS(flag, flags, 0) 1916 1917 /* Add these declarations here only so that these functions can be 1918 * found by name. Otherwise, they are very hard to locate. */ 1919 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1920 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1921 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1922 #if (BITS_PER_LONG < 64) 1923 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1924 1925 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1926 { 1927 (ei)->i_state_flags = 0; 1928 } 1929 #else 1930 EXT4_INODE_BIT_FNS(state, flags, 32) 1931 1932 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1933 { 1934 /* We depend on the fact that callers will set i_flags */ 1935 } 1936 #endif 1937 #else 1938 /* Assume that user mode programs are passing in an ext4fs superblock, not 1939 * a kernel struct super_block. This will allow us to call the feature-test 1940 * macros from user land. */ 1941 #define EXT4_SB(sb) (sb) 1942 #endif 1943 1944 static inline bool ext4_verity_in_progress(struct inode *inode) 1945 { 1946 return IS_ENABLED(CONFIG_FS_VERITY) && 1947 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS); 1948 } 1949 1950 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1951 1952 /* 1953 * Codes for operating systems 1954 */ 1955 #define EXT4_OS_LINUX 0 1956 #define EXT4_OS_HURD 1 1957 #define EXT4_OS_MASIX 2 1958 #define EXT4_OS_FREEBSD 3 1959 #define EXT4_OS_LITES 4 1960 1961 /* 1962 * Revision levels 1963 */ 1964 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1965 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1966 1967 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1968 1969 #define EXT4_GOOD_OLD_INODE_SIZE 128 1970 1971 #define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN) 1972 #define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX 1973 #define EXT4_TIMESTAMP_MIN S32_MIN 1974 1975 /* 1976 * Feature set definitions 1977 */ 1978 1979 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1980 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1981 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1982 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1983 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1984 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1985 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1986 /* 1987 * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes 1988 * incompatible only if fast commit blocks are present in the FS. Since we 1989 * clear the journal (and thus the fast commit blocks), we don't mark FS as 1990 * incompatible. We also have a JBD2 incompat feature, which gets set when 1991 * there are fast commit blocks present in the journal. 1992 */ 1993 #define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400 1994 #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800 1995 #define EXT4_FEATURE_COMPAT_ORPHAN_FILE 0x1000 /* Orphan file exists */ 1996 1997 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1998 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1999 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 2000 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 2001 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 2002 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 2003 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 2004 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 2005 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 2006 /* 2007 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 2008 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 2009 * all other data structures' checksums. However, the METADATA_CSUM and 2010 * GDT_CSUM bits are mutually exclusive. 2011 */ 2012 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 2013 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 2014 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 2015 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000 2016 #define EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT 0x10000 /* Orphan file may be 2017 non-empty */ 2018 2019 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 2020 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 2021 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 2022 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 2023 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 2024 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 2025 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 2026 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 2027 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 2028 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 2029 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 2030 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 2031 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 2032 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 2033 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 2034 #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000 2035 2036 extern void ext4_update_dynamic_rev(struct super_block *sb); 2037 2038 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 2039 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 2040 { \ 2041 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 2042 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 2043 } \ 2044 static inline void ext4_set_feature_##name(struct super_block *sb) \ 2045 { \ 2046 ext4_update_dynamic_rev(sb); \ 2047 EXT4_SB(sb)->s_es->s_feature_compat |= \ 2048 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 2049 } \ 2050 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 2051 { \ 2052 EXT4_SB(sb)->s_es->s_feature_compat &= \ 2053 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 2054 } 2055 2056 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 2057 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 2058 { \ 2059 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 2060 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 2061 } \ 2062 static inline void ext4_set_feature_##name(struct super_block *sb) \ 2063 { \ 2064 ext4_update_dynamic_rev(sb); \ 2065 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 2066 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 2067 } \ 2068 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 2069 { \ 2070 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 2071 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 2072 } 2073 2074 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 2075 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 2076 { \ 2077 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 2078 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 2079 } \ 2080 static inline void ext4_set_feature_##name(struct super_block *sb) \ 2081 { \ 2082 ext4_update_dynamic_rev(sb); \ 2083 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 2084 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 2085 } \ 2086 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 2087 { \ 2088 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 2089 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 2090 } 2091 2092 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 2093 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 2094 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 2095 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 2096 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 2097 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 2098 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 2099 EXT4_FEATURE_COMPAT_FUNCS(fast_commit, FAST_COMMIT) 2100 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES) 2101 EXT4_FEATURE_COMPAT_FUNCS(orphan_file, ORPHAN_FILE) 2102 2103 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 2104 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 2105 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 2106 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 2107 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 2108 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 2109 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 2110 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 2111 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 2112 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 2113 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 2114 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 2115 EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY) 2116 EXT4_FEATURE_RO_COMPAT_FUNCS(orphan_present, ORPHAN_PRESENT) 2117 2118 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 2119 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 2120 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 2121 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 2122 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 2123 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 2124 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 2125 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 2126 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 2127 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 2128 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 2129 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 2130 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 2131 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 2132 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 2133 EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD) 2134 2135 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2136 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2137 EXT4_FEATURE_INCOMPAT_META_BG) 2138 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2139 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2140 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 2141 2142 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2143 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2144 EXT4_FEATURE_INCOMPAT_RECOVER| \ 2145 EXT4_FEATURE_INCOMPAT_META_BG) 2146 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2147 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2148 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 2149 2150 #define EXT4_FEATURE_COMPAT_SUPP (EXT4_FEATURE_COMPAT_EXT_ATTR| \ 2151 EXT4_FEATURE_COMPAT_ORPHAN_FILE) 2152 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2153 EXT4_FEATURE_INCOMPAT_RECOVER| \ 2154 EXT4_FEATURE_INCOMPAT_META_BG| \ 2155 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 2156 EXT4_FEATURE_INCOMPAT_64BIT| \ 2157 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 2158 EXT4_FEATURE_INCOMPAT_EA_INODE| \ 2159 EXT4_FEATURE_INCOMPAT_MMP | \ 2160 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 2161 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 2162 EXT4_FEATURE_INCOMPAT_CASEFOLD | \ 2163 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \ 2164 EXT4_FEATURE_INCOMPAT_LARGEDIR) 2165 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2166 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2167 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 2168 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 2169 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 2170 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 2171 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 2172 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 2173 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 2174 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 2175 EXT4_FEATURE_RO_COMPAT_PROJECT |\ 2176 EXT4_FEATURE_RO_COMPAT_VERITY |\ 2177 EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT) 2178 2179 #define EXTN_FEATURE_FUNCS(ver) \ 2180 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 2181 { \ 2182 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 2183 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 2184 } \ 2185 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 2186 { \ 2187 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 2188 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 2189 } \ 2190 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 2191 { \ 2192 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 2193 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 2194 } 2195 2196 EXTN_FEATURE_FUNCS(2) 2197 EXTN_FEATURE_FUNCS(3) 2198 EXTN_FEATURE_FUNCS(4) 2199 2200 static inline bool ext4_has_compat_features(struct super_block *sb) 2201 { 2202 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 2203 } 2204 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 2205 { 2206 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 2207 } 2208 static inline bool ext4_has_incompat_features(struct super_block *sb) 2209 { 2210 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 2211 } 2212 2213 extern int ext4_feature_set_ok(struct super_block *sb, int readonly); 2214 2215 /* 2216 * Superblock flags 2217 */ 2218 #define EXT4_FLAGS_RESIZING 0 2219 #define EXT4_FLAGS_SHUTDOWN 1 2220 #define EXT4_FLAGS_BDEV_IS_DAX 2 2221 2222 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi) 2223 { 2224 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 2225 } 2226 2227 /* 2228 * Default values for user and/or group using reserved blocks 2229 */ 2230 #define EXT4_DEF_RESUID 0 2231 #define EXT4_DEF_RESGID 0 2232 2233 /* 2234 * Default project ID 2235 */ 2236 #define EXT4_DEF_PROJID 0 2237 2238 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 2239 2240 /* 2241 * Default mount options 2242 */ 2243 #define EXT4_DEFM_DEBUG 0x0001 2244 #define EXT4_DEFM_BSDGROUPS 0x0002 2245 #define EXT4_DEFM_XATTR_USER 0x0004 2246 #define EXT4_DEFM_ACL 0x0008 2247 #define EXT4_DEFM_UID16 0x0010 2248 #define EXT4_DEFM_JMODE 0x0060 2249 #define EXT4_DEFM_JMODE_DATA 0x0020 2250 #define EXT4_DEFM_JMODE_ORDERED 0x0040 2251 #define EXT4_DEFM_JMODE_WBACK 0x0060 2252 #define EXT4_DEFM_NOBARRIER 0x0100 2253 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 2254 #define EXT4_DEFM_DISCARD 0x0400 2255 #define EXT4_DEFM_NODELALLOC 0x0800 2256 2257 /* 2258 * Default journal batch times 2259 */ 2260 #define EXT4_DEF_MIN_BATCH_TIME 0 2261 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 2262 2263 /* 2264 * Minimum number of groups in a flexgroup before we separate out 2265 * directories into the first block group of a flexgroup 2266 */ 2267 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 2268 2269 /* 2270 * Structure of a directory entry 2271 */ 2272 #define EXT4_NAME_LEN 255 2273 2274 struct ext4_dir_entry { 2275 __le32 inode; /* Inode number */ 2276 __le16 rec_len; /* Directory entry length */ 2277 __le16 name_len; /* Name length */ 2278 char name[EXT4_NAME_LEN]; /* File name */ 2279 }; 2280 2281 2282 /* 2283 * Encrypted Casefolded entries require saving the hash on disk. This structure 2284 * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned 2285 * boundary. 2286 */ 2287 struct ext4_dir_entry_hash { 2288 __le32 hash; 2289 __le32 minor_hash; 2290 }; 2291 2292 /* 2293 * The new version of the directory entry. Since EXT4 structures are 2294 * stored in intel byte order, and the name_len field could never be 2295 * bigger than 255 chars, it's safe to reclaim the extra byte for the 2296 * file_type field. 2297 */ 2298 struct ext4_dir_entry_2 { 2299 __le32 inode; /* Inode number */ 2300 __le16 rec_len; /* Directory entry length */ 2301 __u8 name_len; /* Name length */ 2302 __u8 file_type; /* See file type macros EXT4_FT_* below */ 2303 char name[EXT4_NAME_LEN]; /* File name */ 2304 }; 2305 2306 /* 2307 * Access the hashes at the end of ext4_dir_entry_2 2308 */ 2309 #define EXT4_DIRENT_HASHES(entry) \ 2310 ((struct ext4_dir_entry_hash *) \ 2311 (((void *)(entry)) + \ 2312 ((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND))) 2313 #define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(de)->hash) 2314 #define EXT4_DIRENT_MINOR_HASH(entry) \ 2315 le32_to_cpu(EXT4_DIRENT_HASHES(de)->minor_hash) 2316 2317 static inline bool ext4_hash_in_dirent(const struct inode *inode) 2318 { 2319 return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode); 2320 } 2321 2322 /* 2323 * This is a bogus directory entry at the end of each leaf block that 2324 * records checksums. 2325 */ 2326 struct ext4_dir_entry_tail { 2327 __le32 det_reserved_zero1; /* Pretend to be unused */ 2328 __le16 det_rec_len; /* 12 */ 2329 __u8 det_reserved_zero2; /* Zero name length */ 2330 __u8 det_reserved_ft; /* 0xDE, fake file type */ 2331 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 2332 }; 2333 2334 #define EXT4_DIRENT_TAIL(block, blocksize) \ 2335 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 2336 ((blocksize) - \ 2337 sizeof(struct ext4_dir_entry_tail)))) 2338 2339 /* 2340 * Ext4 directory file types. Only the low 3 bits are used. The 2341 * other bits are reserved for now. 2342 */ 2343 #define EXT4_FT_UNKNOWN 0 2344 #define EXT4_FT_REG_FILE 1 2345 #define EXT4_FT_DIR 2 2346 #define EXT4_FT_CHRDEV 3 2347 #define EXT4_FT_BLKDEV 4 2348 #define EXT4_FT_FIFO 5 2349 #define EXT4_FT_SOCK 6 2350 #define EXT4_FT_SYMLINK 7 2351 2352 #define EXT4_FT_MAX 8 2353 2354 #define EXT4_FT_DIR_CSUM 0xDE 2355 2356 /* 2357 * EXT4_DIR_PAD defines the directory entries boundaries 2358 * 2359 * NOTE: It must be a multiple of 4 2360 */ 2361 #define EXT4_DIR_PAD 4 2362 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 2363 #define EXT4_MAX_REC_LEN ((1<<16)-1) 2364 2365 /* 2366 * The rec_len is dependent on the type of directory. Directories that are 2367 * casefolded and encrypted need to store the hash as well, so we add room for 2368 * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should 2369 * pass NULL for dir, as those entries do not use the extra fields. 2370 */ 2371 static inline unsigned int ext4_dir_rec_len(__u8 name_len, 2372 const struct inode *dir) 2373 { 2374 int rec_len = (name_len + 8 + EXT4_DIR_ROUND); 2375 2376 if (dir && ext4_hash_in_dirent(dir)) 2377 rec_len += sizeof(struct ext4_dir_entry_hash); 2378 return (rec_len & ~EXT4_DIR_ROUND); 2379 } 2380 2381 /* 2382 * If we ever get support for fs block sizes > page_size, we'll need 2383 * to remove the #if statements in the next two functions... 2384 */ 2385 static inline unsigned int 2386 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 2387 { 2388 unsigned len = le16_to_cpu(dlen); 2389 2390 #if (PAGE_SIZE >= 65536) 2391 if (len == EXT4_MAX_REC_LEN || len == 0) 2392 return blocksize; 2393 return (len & 65532) | ((len & 3) << 16); 2394 #else 2395 return len; 2396 #endif 2397 } 2398 2399 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 2400 { 2401 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 2402 BUG(); 2403 #if (PAGE_SIZE >= 65536) 2404 if (len < 65536) 2405 return cpu_to_le16(len); 2406 if (len == blocksize) { 2407 if (blocksize == 65536) 2408 return cpu_to_le16(EXT4_MAX_REC_LEN); 2409 else 2410 return cpu_to_le16(0); 2411 } 2412 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 2413 #else 2414 return cpu_to_le16(len); 2415 #endif 2416 } 2417 2418 /* 2419 * Hash Tree Directory indexing 2420 * (c) Daniel Phillips, 2001 2421 */ 2422 2423 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2424 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2425 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \ 2426 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir))) 2427 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2428 2429 /* Legal values for the dx_root hash_version field: */ 2430 2431 #define DX_HASH_LEGACY 0 2432 #define DX_HASH_HALF_MD4 1 2433 #define DX_HASH_TEA 2 2434 #define DX_HASH_LEGACY_UNSIGNED 3 2435 #define DX_HASH_HALF_MD4_UNSIGNED 4 2436 #define DX_HASH_TEA_UNSIGNED 5 2437 #define DX_HASH_SIPHASH 6 2438 2439 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 2440 const void *address, unsigned int length) 2441 { 2442 struct { 2443 struct shash_desc shash; 2444 char ctx[4]; 2445 } desc; 2446 2447 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2448 2449 desc.shash.tfm = sbi->s_chksum_driver; 2450 *(u32 *)desc.ctx = crc; 2451 2452 BUG_ON(crypto_shash_update(&desc.shash, address, length)); 2453 2454 return *(u32 *)desc.ctx; 2455 } 2456 2457 #ifdef __KERNEL__ 2458 2459 /* hash info structure used by the directory hash */ 2460 struct dx_hash_info 2461 { 2462 u32 hash; 2463 u32 minor_hash; 2464 int hash_version; 2465 u32 *seed; 2466 }; 2467 2468 2469 /* 32 and 64 bit signed EOF for dx directories */ 2470 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2471 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2472 2473 2474 /* 2475 * Control parameters used by ext4_htree_next_block 2476 */ 2477 #define HASH_NB_ALWAYS 1 2478 2479 struct ext4_filename { 2480 const struct qstr *usr_fname; 2481 struct fscrypt_str disk_name; 2482 struct dx_hash_info hinfo; 2483 #ifdef CONFIG_FS_ENCRYPTION 2484 struct fscrypt_str crypto_buf; 2485 #endif 2486 #ifdef CONFIG_UNICODE 2487 struct fscrypt_str cf_name; 2488 #endif 2489 }; 2490 2491 #define fname_name(p) ((p)->disk_name.name) 2492 #define fname_usr_name(p) ((p)->usr_fname->name) 2493 #define fname_len(p) ((p)->disk_name.len) 2494 2495 /* 2496 * Describe an inode's exact location on disk and in memory 2497 */ 2498 struct ext4_iloc 2499 { 2500 struct buffer_head *bh; 2501 unsigned long offset; 2502 ext4_group_t block_group; 2503 }; 2504 2505 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2506 { 2507 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2508 } 2509 2510 static inline bool ext4_is_quota_file(struct inode *inode) 2511 { 2512 return IS_NOQUOTA(inode) && 2513 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL); 2514 } 2515 2516 /* 2517 * This structure is stuffed into the struct file's private_data field 2518 * for directories. It is where we put information so that we can do 2519 * readdir operations in hash tree order. 2520 */ 2521 struct dir_private_info { 2522 struct rb_root root; 2523 struct rb_node *curr_node; 2524 struct fname *extra_fname; 2525 loff_t last_pos; 2526 __u32 curr_hash; 2527 __u32 curr_minor_hash; 2528 __u32 next_hash; 2529 }; 2530 2531 /* calculate the first block number of the group */ 2532 static inline ext4_fsblk_t 2533 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2534 { 2535 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2536 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2537 } 2538 2539 /* 2540 * Special error return code only used by dx_probe() and its callers. 2541 */ 2542 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2543 2544 /* htree levels for ext4 */ 2545 #define EXT4_HTREE_LEVEL_COMPAT 2 2546 #define EXT4_HTREE_LEVEL 3 2547 2548 static inline int ext4_dir_htree_level(struct super_block *sb) 2549 { 2550 return ext4_has_feature_largedir(sb) ? 2551 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT; 2552 } 2553 2554 /* 2555 * Timeout and state flag for lazy initialization inode thread. 2556 */ 2557 #define EXT4_DEF_LI_WAIT_MULT 10 2558 #define EXT4_DEF_LI_MAX_START_DELAY 5 2559 #define EXT4_LAZYINIT_QUIT 0x0001 2560 #define EXT4_LAZYINIT_RUNNING 0x0002 2561 2562 /* 2563 * Lazy inode table initialization info 2564 */ 2565 struct ext4_lazy_init { 2566 unsigned long li_state; 2567 struct list_head li_request_list; 2568 struct mutex li_list_mtx; 2569 }; 2570 2571 enum ext4_li_mode { 2572 EXT4_LI_MODE_PREFETCH_BBITMAP, 2573 EXT4_LI_MODE_ITABLE, 2574 }; 2575 2576 struct ext4_li_request { 2577 struct super_block *lr_super; 2578 enum ext4_li_mode lr_mode; 2579 ext4_group_t lr_first_not_zeroed; 2580 ext4_group_t lr_next_group; 2581 struct list_head lr_request; 2582 unsigned long lr_next_sched; 2583 unsigned long lr_timeout; 2584 }; 2585 2586 struct ext4_features { 2587 struct kobject f_kobj; 2588 struct completion f_kobj_unregister; 2589 }; 2590 2591 /* 2592 * This structure will be used for multiple mount protection. It will be 2593 * written into the block number saved in the s_mmp_block field in the 2594 * superblock. Programs that check MMP should assume that if 2595 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2596 * to use the filesystem, regardless of how old the timestamp is. 2597 */ 2598 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2599 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2600 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2601 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2602 2603 struct mmp_struct { 2604 __le32 mmp_magic; /* Magic number for MMP */ 2605 __le32 mmp_seq; /* Sequence no. updated periodically */ 2606 2607 /* 2608 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2609 * purposes and do not affect the correctness of the algorithm 2610 */ 2611 __le64 mmp_time; /* Time last updated */ 2612 char mmp_nodename[64]; /* Node which last updated MMP block */ 2613 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2614 2615 /* 2616 * mmp_check_interval is used to verify if the MMP block has been 2617 * updated on the block device. The value is updated based on the 2618 * maximum time to write the MMP block during an update cycle. 2619 */ 2620 __le16 mmp_check_interval; 2621 2622 __le16 mmp_pad1; 2623 __le32 mmp_pad2[226]; 2624 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2625 }; 2626 2627 /* arguments passed to the mmp thread */ 2628 struct mmpd_data { 2629 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2630 struct super_block *sb; /* super block of the fs */ 2631 }; 2632 2633 /* 2634 * Check interval multiplier 2635 * The MMP block is written every update interval and initially checked every 2636 * update interval x the multiplier (the value is then adapted based on the 2637 * write latency). The reason is that writes can be delayed under load and we 2638 * don't want readers to incorrectly assume that the filesystem is no longer 2639 * in use. 2640 */ 2641 #define EXT4_MMP_CHECK_MULT 2UL 2642 2643 /* 2644 * Minimum interval for MMP checking in seconds. 2645 */ 2646 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2647 2648 /* 2649 * Maximum interval for MMP checking in seconds. 2650 */ 2651 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2652 2653 /* 2654 * Function prototypes 2655 */ 2656 2657 /* 2658 * Ok, these declarations are also in <linux/kernel.h> but none of the 2659 * ext4 source programs needs to include it so they are duplicated here. 2660 */ 2661 # define NORET_TYPE /**/ 2662 # define ATTRIB_NORET __attribute__((noreturn)) 2663 # define NORET_AND noreturn, 2664 2665 /* bitmap.c */ 2666 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2667 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2668 struct ext4_group_desc *gdp, 2669 struct buffer_head *bh, int sz); 2670 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2671 struct ext4_group_desc *gdp, 2672 struct buffer_head *bh, int sz); 2673 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2674 struct ext4_group_desc *gdp, 2675 struct buffer_head *bh); 2676 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2677 struct ext4_group_desc *gdp, 2678 struct buffer_head *bh); 2679 2680 /* balloc.c */ 2681 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2682 ext4_fsblk_t blocknr, 2683 ext4_group_t *blockgrpp, 2684 ext4_grpblk_t *offsetp); 2685 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2686 ext4_fsblk_t block); 2687 2688 extern unsigned int ext4_block_group(struct super_block *sb, 2689 ext4_fsblk_t blocknr); 2690 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2691 ext4_fsblk_t blocknr); 2692 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2693 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2694 ext4_group_t group); 2695 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2696 ext4_fsblk_t goal, 2697 unsigned int flags, 2698 unsigned long *count, 2699 int *errp); 2700 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2701 s64 nclusters, unsigned int flags); 2702 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2703 extern void ext4_check_blocks_bitmap(struct super_block *); 2704 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2705 ext4_group_t block_group, 2706 struct buffer_head ** bh); 2707 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2708 2709 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2710 ext4_group_t block_group, 2711 bool ignore_locked); 2712 extern int ext4_wait_block_bitmap(struct super_block *sb, 2713 ext4_group_t block_group, 2714 struct buffer_head *bh); 2715 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2716 ext4_group_t block_group); 2717 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2718 ext4_group_t block_group, 2719 struct ext4_group_desc *gdp); 2720 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2721 2722 #ifdef CONFIG_UNICODE 2723 extern int ext4_fname_setup_ci_filename(struct inode *dir, 2724 const struct qstr *iname, 2725 struct ext4_filename *fname); 2726 #endif 2727 2728 #ifdef CONFIG_FS_ENCRYPTION 2729 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst, 2730 const struct fscrypt_name *src) 2731 { 2732 memset(dst, 0, sizeof(*dst)); 2733 2734 dst->usr_fname = src->usr_fname; 2735 dst->disk_name = src->disk_name; 2736 dst->hinfo.hash = src->hash; 2737 dst->hinfo.minor_hash = src->minor_hash; 2738 dst->crypto_buf = src->crypto_buf; 2739 } 2740 2741 static inline int ext4_fname_setup_filename(struct inode *dir, 2742 const struct qstr *iname, 2743 int lookup, 2744 struct ext4_filename *fname) 2745 { 2746 struct fscrypt_name name; 2747 int err; 2748 2749 err = fscrypt_setup_filename(dir, iname, lookup, &name); 2750 if (err) 2751 return err; 2752 2753 ext4_fname_from_fscrypt_name(fname, &name); 2754 2755 #ifdef CONFIG_UNICODE 2756 err = ext4_fname_setup_ci_filename(dir, iname, fname); 2757 #endif 2758 return err; 2759 } 2760 2761 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2762 struct dentry *dentry, 2763 struct ext4_filename *fname) 2764 { 2765 struct fscrypt_name name; 2766 int err; 2767 2768 err = fscrypt_prepare_lookup(dir, dentry, &name); 2769 if (err) 2770 return err; 2771 2772 ext4_fname_from_fscrypt_name(fname, &name); 2773 2774 #ifdef CONFIG_UNICODE 2775 err = ext4_fname_setup_ci_filename(dir, &dentry->d_name, fname); 2776 #endif 2777 return err; 2778 } 2779 2780 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2781 { 2782 struct fscrypt_name name; 2783 2784 name.crypto_buf = fname->crypto_buf; 2785 fscrypt_free_filename(&name); 2786 2787 fname->crypto_buf.name = NULL; 2788 fname->usr_fname = NULL; 2789 fname->disk_name.name = NULL; 2790 2791 #ifdef CONFIG_UNICODE 2792 kfree(fname->cf_name.name); 2793 fname->cf_name.name = NULL; 2794 #endif 2795 } 2796 #else /* !CONFIG_FS_ENCRYPTION */ 2797 static inline int ext4_fname_setup_filename(struct inode *dir, 2798 const struct qstr *iname, 2799 int lookup, 2800 struct ext4_filename *fname) 2801 { 2802 int err = 0; 2803 fname->usr_fname = iname; 2804 fname->disk_name.name = (unsigned char *) iname->name; 2805 fname->disk_name.len = iname->len; 2806 2807 #ifdef CONFIG_UNICODE 2808 err = ext4_fname_setup_ci_filename(dir, iname, fname); 2809 #endif 2810 2811 return err; 2812 } 2813 2814 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2815 struct dentry *dentry, 2816 struct ext4_filename *fname) 2817 { 2818 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname); 2819 } 2820 2821 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2822 { 2823 #ifdef CONFIG_UNICODE 2824 kfree(fname->cf_name.name); 2825 fname->cf_name.name = NULL; 2826 #endif 2827 } 2828 #endif /* !CONFIG_FS_ENCRYPTION */ 2829 2830 /* dir.c */ 2831 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2832 struct file *, 2833 struct ext4_dir_entry_2 *, 2834 struct buffer_head *, char *, int, 2835 unsigned int); 2836 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2837 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2838 (de), (bh), (buf), (size), (offset))) 2839 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2840 __u32 minor_hash, 2841 struct ext4_dir_entry_2 *dirent, 2842 struct fscrypt_str *ent_name); 2843 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2844 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2845 struct buffer_head *bh, 2846 void *buf, int buf_size, 2847 struct ext4_filename *fname, 2848 struct ext4_dir_entry_2 **dest_de); 2849 void ext4_insert_dentry(struct inode *dir, struct inode *inode, 2850 struct ext4_dir_entry_2 *de, 2851 int buf_size, 2852 struct ext4_filename *fname); 2853 static inline void ext4_update_dx_flag(struct inode *inode) 2854 { 2855 if (!ext4_has_feature_dir_index(inode->i_sb) && 2856 ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) { 2857 /* ext4_iget() should have caught this... */ 2858 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb)); 2859 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2860 } 2861 } 2862 static const unsigned char ext4_filetype_table[] = { 2863 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2864 }; 2865 2866 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2867 { 2868 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2869 return DT_UNKNOWN; 2870 2871 return ext4_filetype_table[filetype]; 2872 } 2873 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2874 void *buf, int buf_size); 2875 2876 /* fsync.c */ 2877 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2878 2879 /* hash.c */ 2880 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len, 2881 struct dx_hash_info *hinfo); 2882 2883 /* ialloc.c */ 2884 extern int ext4_mark_inode_used(struct super_block *sb, int ino); 2885 extern struct inode *__ext4_new_inode(struct user_namespace *, handle_t *, 2886 struct inode *, umode_t, 2887 const struct qstr *qstr, __u32 goal, 2888 uid_t *owner, __u32 i_flags, 2889 int handle_type, unsigned int line_no, 2890 int nblocks); 2891 2892 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \ 2893 __ext4_new_inode(&init_user_ns, (handle), (dir), (mode), (qstr), \ 2894 (goal), (owner), i_flags, 0, 0, 0) 2895 #define ext4_new_inode_start_handle(mnt_userns, dir, mode, qstr, goal, owner, \ 2896 type, nblocks) \ 2897 __ext4_new_inode((mnt_userns), NULL, (dir), (mode), (qstr), (goal), (owner), \ 2898 0, (type), __LINE__, (nblocks)) 2899 2900 2901 extern void ext4_free_inode(handle_t *, struct inode *); 2902 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2903 extern unsigned long ext4_count_free_inodes(struct super_block *); 2904 extern unsigned long ext4_count_dirs(struct super_block *); 2905 extern void ext4_check_inodes_bitmap(struct super_block *); 2906 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2907 extern int ext4_init_inode_table(struct super_block *sb, 2908 ext4_group_t group, int barrier); 2909 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2910 2911 /* fast_commit.c */ 2912 int ext4_fc_info_show(struct seq_file *seq, void *v); 2913 void ext4_fc_init(struct super_block *sb, journal_t *journal); 2914 void ext4_fc_init_inode(struct inode *inode); 2915 void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start, 2916 ext4_lblk_t end); 2917 void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode, 2918 struct dentry *dentry); 2919 void __ext4_fc_track_link(handle_t *handle, struct inode *inode, 2920 struct dentry *dentry); 2921 void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry); 2922 void ext4_fc_track_link(handle_t *handle, struct dentry *dentry); 2923 void __ext4_fc_track_create(handle_t *handle, struct inode *inode, 2924 struct dentry *dentry); 2925 void ext4_fc_track_create(handle_t *handle, struct dentry *dentry); 2926 void ext4_fc_track_inode(handle_t *handle, struct inode *inode); 2927 void ext4_fc_mark_ineligible(struct super_block *sb, int reason); 2928 void ext4_fc_start_update(struct inode *inode); 2929 void ext4_fc_stop_update(struct inode *inode); 2930 void ext4_fc_del(struct inode *inode); 2931 bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block); 2932 void ext4_fc_replay_cleanup(struct super_block *sb); 2933 int ext4_fc_commit(journal_t *journal, tid_t commit_tid); 2934 int __init ext4_fc_init_dentry_cache(void); 2935 void ext4_fc_destroy_dentry_cache(void); 2936 2937 /* mballoc.c */ 2938 extern const struct seq_operations ext4_mb_seq_groups_ops; 2939 extern const struct seq_operations ext4_mb_seq_structs_summary_ops; 2940 extern long ext4_mb_stats; 2941 extern long ext4_mb_max_to_scan; 2942 extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset); 2943 extern int ext4_mb_init(struct super_block *); 2944 extern int ext4_mb_release(struct super_block *); 2945 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2946 struct ext4_allocation_request *, int *); 2947 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2948 extern void ext4_discard_preallocations(struct inode *, unsigned int); 2949 extern int __init ext4_init_mballoc(void); 2950 extern void ext4_exit_mballoc(void); 2951 extern ext4_group_t ext4_mb_prefetch(struct super_block *sb, 2952 ext4_group_t group, 2953 unsigned int nr, int *cnt); 2954 extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group, 2955 unsigned int nr); 2956 2957 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2958 struct buffer_head *bh, ext4_fsblk_t block, 2959 unsigned long count, int flags); 2960 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2961 ext4_group_t ngroups); 2962 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2963 ext4_group_t i, struct ext4_group_desc *desc); 2964 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2965 ext4_fsblk_t block, unsigned long count); 2966 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2967 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid); 2968 extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block, 2969 int len, int state); 2970 2971 /* inode.c */ 2972 void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw, 2973 struct ext4_inode_info *ei); 2974 int ext4_inode_is_fast_symlink(struct inode *inode); 2975 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2976 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2977 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count, 2978 bool wait, struct buffer_head **bhs); 2979 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2980 struct buffer_head *bh_result, int create); 2981 int ext4_get_block(struct inode *inode, sector_t iblock, 2982 struct buffer_head *bh_result, int create); 2983 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2984 struct buffer_head *bh, int create); 2985 int ext4_walk_page_buffers(handle_t *handle, 2986 struct inode *inode, 2987 struct buffer_head *head, 2988 unsigned from, 2989 unsigned to, 2990 int *partial, 2991 int (*fn)(handle_t *handle, struct inode *inode, 2992 struct buffer_head *bh)); 2993 int do_journal_get_write_access(handle_t *handle, struct inode *inode, 2994 struct buffer_head *bh); 2995 #define FALL_BACK_TO_NONDELALLOC 1 2996 #define CONVERT_INLINE_DATA 2 2997 2998 typedef enum { 2999 EXT4_IGET_NORMAL = 0, 3000 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */ 3001 EXT4_IGET_HANDLE = 0x0002 /* Inode # is from a handle */ 3002 } ext4_iget_flags; 3003 3004 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, 3005 ext4_iget_flags flags, const char *function, 3006 unsigned int line); 3007 3008 #define ext4_iget(sb, ino, flags) \ 3009 __ext4_iget((sb), (ino), (flags), __func__, __LINE__) 3010 3011 extern int ext4_write_inode(struct inode *, struct writeback_control *); 3012 extern int ext4_setattr(struct user_namespace *, struct dentry *, 3013 struct iattr *); 3014 extern int ext4_getattr(struct user_namespace *, const struct path *, 3015 struct kstat *, u32, unsigned int); 3016 extern void ext4_evict_inode(struct inode *); 3017 extern void ext4_clear_inode(struct inode *); 3018 extern int ext4_file_getattr(struct user_namespace *, const struct path *, 3019 struct kstat *, u32, unsigned int); 3020 extern int ext4_sync_inode(handle_t *, struct inode *); 3021 extern void ext4_dirty_inode(struct inode *, int); 3022 extern int ext4_change_inode_journal_flag(struct inode *, int); 3023 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 3024 extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino, 3025 struct ext4_iloc *iloc); 3026 extern int ext4_inode_attach_jinode(struct inode *inode); 3027 extern int ext4_can_truncate(struct inode *inode); 3028 extern int ext4_truncate(struct inode *); 3029 extern int ext4_break_layouts(struct inode *); 3030 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 3031 extern void ext4_set_inode_flags(struct inode *, bool init); 3032 extern int ext4_alloc_da_blocks(struct inode *inode); 3033 extern void ext4_set_aops(struct inode *inode); 3034 extern int ext4_writepage_trans_blocks(struct inode *); 3035 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 3036 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 3037 loff_t lstart, loff_t lend); 3038 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf); 3039 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 3040 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 3041 extern void ext4_da_release_space(struct inode *inode, int to_free); 3042 extern void ext4_da_update_reserve_space(struct inode *inode, 3043 int used, int quota_claim); 3044 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 3045 ext4_fsblk_t pblk, ext4_lblk_t len); 3046 3047 /* indirect.c */ 3048 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 3049 struct ext4_map_blocks *map, int flags); 3050 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 3051 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 3052 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 3053 ext4_lblk_t start, ext4_lblk_t end); 3054 3055 /* ioctl.c */ 3056 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 3057 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 3058 int ext4_fileattr_set(struct user_namespace *mnt_userns, 3059 struct dentry *dentry, struct fileattr *fa); 3060 int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa); 3061 extern void ext4_reset_inode_seed(struct inode *inode); 3062 3063 /* migrate.c */ 3064 extern int ext4_ext_migrate(struct inode *); 3065 extern int ext4_ind_migrate(struct inode *inode); 3066 3067 /* namei.c */ 3068 extern int ext4_init_new_dir(handle_t *handle, struct inode *dir, 3069 struct inode *inode); 3070 extern int ext4_dirblock_csum_verify(struct inode *inode, 3071 struct buffer_head *bh); 3072 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 3073 __u32 start_minor_hash, __u32 *next_hash); 3074 extern int ext4_search_dir(struct buffer_head *bh, 3075 char *search_buf, 3076 int buf_size, 3077 struct inode *dir, 3078 struct ext4_filename *fname, 3079 unsigned int offset, 3080 struct ext4_dir_entry_2 **res_dir); 3081 extern int ext4_generic_delete_entry(struct inode *dir, 3082 struct ext4_dir_entry_2 *de_del, 3083 struct buffer_head *bh, 3084 void *entry_buf, 3085 int buf_size, 3086 int csum_size); 3087 extern bool ext4_empty_dir(struct inode *inode); 3088 3089 /* resize.c */ 3090 extern void ext4_kvfree_array_rcu(void *to_free); 3091 extern int ext4_group_add(struct super_block *sb, 3092 struct ext4_new_group_data *input); 3093 extern int ext4_group_extend(struct super_block *sb, 3094 struct ext4_super_block *es, 3095 ext4_fsblk_t n_blocks_count); 3096 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 3097 3098 /* super.c */ 3099 extern struct buffer_head *ext4_sb_bread(struct super_block *sb, 3100 sector_t block, int op_flags); 3101 extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb, 3102 sector_t block); 3103 extern void ext4_read_bh_nowait(struct buffer_head *bh, int op_flags, 3104 bh_end_io_t *end_io); 3105 extern int ext4_read_bh(struct buffer_head *bh, int op_flags, 3106 bh_end_io_t *end_io); 3107 extern int ext4_read_bh_lock(struct buffer_head *bh, int op_flags, bool wait); 3108 extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block); 3109 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 3110 extern int ext4_calculate_overhead(struct super_block *sb); 3111 extern void ext4_superblock_csum_set(struct super_block *sb); 3112 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 3113 ext4_group_t ngroup); 3114 extern const char *ext4_decode_error(struct super_block *sb, int errno, 3115 char nbuf[16]); 3116 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb, 3117 ext4_group_t block_group, 3118 unsigned int flags); 3119 3120 extern __printf(7, 8) 3121 void __ext4_error(struct super_block *, const char *, unsigned int, bool, 3122 int, __u64, const char *, ...); 3123 extern __printf(6, 7) 3124 void __ext4_error_inode(struct inode *, const char *, unsigned int, 3125 ext4_fsblk_t, int, const char *, ...); 3126 extern __printf(5, 6) 3127 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 3128 const char *, ...); 3129 extern void __ext4_std_error(struct super_block *, const char *, 3130 unsigned int, int); 3131 extern __printf(4, 5) 3132 void __ext4_warning(struct super_block *, const char *, unsigned int, 3133 const char *, ...); 3134 extern __printf(4, 5) 3135 void __ext4_warning_inode(const struct inode *inode, const char *function, 3136 unsigned int line, const char *fmt, ...); 3137 extern __printf(3, 4) 3138 void __ext4_msg(struct super_block *, const char *, const char *, ...); 3139 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 3140 const char *, unsigned int, const char *); 3141 extern __printf(7, 8) 3142 void __ext4_grp_locked_error(const char *, unsigned int, 3143 struct super_block *, ext4_group_t, 3144 unsigned long, ext4_fsblk_t, 3145 const char *, ...); 3146 3147 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 3148 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 3149 3150 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \ 3151 __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a) 3152 3153 #define ext4_error_inode_block(inode, block, err, fmt, a...) \ 3154 __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \ 3155 (fmt), ## a) 3156 3157 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 3158 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 3159 3160 #define ext4_abort(sb, err, fmt, a...) \ 3161 __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a) 3162 3163 #ifdef CONFIG_PRINTK 3164 3165 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 3166 __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__) 3167 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 3168 __ext4_error_inode((inode), (func), (line), (block), \ 3169 (err), (fmt), ##__VA_ARGS__) 3170 #define ext4_error_file(file, func, line, block, fmt, ...) \ 3171 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 3172 #define ext4_error(sb, fmt, ...) \ 3173 __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt), \ 3174 ##__VA_ARGS__) 3175 #define ext4_error_err(sb, err, fmt, ...) \ 3176 __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt), \ 3177 ##__VA_ARGS__) 3178 #define ext4_warning(sb, fmt, ...) \ 3179 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 3180 #define ext4_warning_inode(inode, fmt, ...) \ 3181 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 3182 #define ext4_msg(sb, level, fmt, ...) \ 3183 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 3184 #define dump_mmp_msg(sb, mmp, msg) \ 3185 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 3186 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 3187 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 3188 fmt, ##__VA_ARGS__) 3189 3190 #else 3191 3192 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 3193 do { \ 3194 no_printk(fmt, ##__VA_ARGS__); \ 3195 __ext4_error_inode(inode, "", 0, block, 0, " "); \ 3196 } while (0) 3197 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 3198 do { \ 3199 no_printk(fmt, ##__VA_ARGS__); \ 3200 __ext4_error_inode(inode, "", 0, block, err, " "); \ 3201 } while (0) 3202 #define ext4_error_file(file, func, line, block, fmt, ...) \ 3203 do { \ 3204 no_printk(fmt, ##__VA_ARGS__); \ 3205 __ext4_error_file(file, "", 0, block, " "); \ 3206 } while (0) 3207 #define ext4_error(sb, fmt, ...) \ 3208 do { \ 3209 no_printk(fmt, ##__VA_ARGS__); \ 3210 __ext4_error(sb, "", 0, false, 0, 0, " "); \ 3211 } while (0) 3212 #define ext4_error_err(sb, err, fmt, ...) \ 3213 do { \ 3214 no_printk(fmt, ##__VA_ARGS__); \ 3215 __ext4_error(sb, "", 0, false, err, 0, " "); \ 3216 } while (0) 3217 #define ext4_warning(sb, fmt, ...) \ 3218 do { \ 3219 no_printk(fmt, ##__VA_ARGS__); \ 3220 __ext4_warning(sb, "", 0, " "); \ 3221 } while (0) 3222 #define ext4_warning_inode(inode, fmt, ...) \ 3223 do { \ 3224 no_printk(fmt, ##__VA_ARGS__); \ 3225 __ext4_warning_inode(inode, "", 0, " "); \ 3226 } while (0) 3227 #define ext4_msg(sb, level, fmt, ...) \ 3228 do { \ 3229 no_printk(fmt, ##__VA_ARGS__); \ 3230 __ext4_msg(sb, "", " "); \ 3231 } while (0) 3232 #define dump_mmp_msg(sb, mmp, msg) \ 3233 __dump_mmp_msg(sb, mmp, "", 0, "") 3234 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 3235 do { \ 3236 no_printk(fmt, ##__VA_ARGS__); \ 3237 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 3238 } while (0) 3239 3240 #endif 3241 3242 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 3243 struct ext4_group_desc *bg); 3244 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 3245 struct ext4_group_desc *bg); 3246 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 3247 struct ext4_group_desc *bg); 3248 extern __u32 ext4_free_group_clusters(struct super_block *sb, 3249 struct ext4_group_desc *bg); 3250 extern __u32 ext4_free_inodes_count(struct super_block *sb, 3251 struct ext4_group_desc *bg); 3252 extern __u32 ext4_used_dirs_count(struct super_block *sb, 3253 struct ext4_group_desc *bg); 3254 extern __u32 ext4_itable_unused_count(struct super_block *sb, 3255 struct ext4_group_desc *bg); 3256 extern void ext4_block_bitmap_set(struct super_block *sb, 3257 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3258 extern void ext4_inode_bitmap_set(struct super_block *sb, 3259 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3260 extern void ext4_inode_table_set(struct super_block *sb, 3261 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3262 extern void ext4_free_group_clusters_set(struct super_block *sb, 3263 struct ext4_group_desc *bg, 3264 __u32 count); 3265 extern void ext4_free_inodes_set(struct super_block *sb, 3266 struct ext4_group_desc *bg, __u32 count); 3267 extern void ext4_used_dirs_set(struct super_block *sb, 3268 struct ext4_group_desc *bg, __u32 count); 3269 extern void ext4_itable_unused_set(struct super_block *sb, 3270 struct ext4_group_desc *bg, __u32 count); 3271 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 3272 struct ext4_group_desc *gdp); 3273 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 3274 struct ext4_group_desc *gdp); 3275 extern int ext4_register_li_request(struct super_block *sb, 3276 ext4_group_t first_not_zeroed); 3277 3278 static inline int ext4_has_metadata_csum(struct super_block *sb) 3279 { 3280 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 3281 !EXT4_SB(sb)->s_chksum_driver); 3282 3283 return ext4_has_feature_metadata_csum(sb) && 3284 (EXT4_SB(sb)->s_chksum_driver != NULL); 3285 } 3286 3287 static inline int ext4_has_group_desc_csum(struct super_block *sb) 3288 { 3289 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb); 3290 } 3291 3292 #define ext4_read_incompat_64bit_val(es, name) \ 3293 (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \ 3294 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \ 3295 le32_to_cpu(es->name##_lo)) 3296 3297 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 3298 { 3299 return ext4_read_incompat_64bit_val(es, s_blocks_count); 3300 } 3301 3302 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 3303 { 3304 return ext4_read_incompat_64bit_val(es, s_r_blocks_count); 3305 } 3306 3307 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 3308 { 3309 return ext4_read_incompat_64bit_val(es, s_free_blocks_count); 3310 } 3311 3312 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 3313 ext4_fsblk_t blk) 3314 { 3315 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 3316 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 3317 } 3318 3319 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 3320 ext4_fsblk_t blk) 3321 { 3322 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 3323 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 3324 } 3325 3326 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 3327 ext4_fsblk_t blk) 3328 { 3329 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 3330 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 3331 } 3332 3333 static inline loff_t ext4_isize(struct super_block *sb, 3334 struct ext4_inode *raw_inode) 3335 { 3336 if (ext4_has_feature_largedir(sb) || 3337 S_ISREG(le16_to_cpu(raw_inode->i_mode))) 3338 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 3339 le32_to_cpu(raw_inode->i_size_lo); 3340 3341 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 3342 } 3343 3344 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 3345 { 3346 raw_inode->i_size_lo = cpu_to_le32(i_size); 3347 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 3348 } 3349 3350 static inline 3351 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 3352 ext4_group_t group) 3353 { 3354 struct ext4_group_info **grp_info; 3355 long indexv, indexh; 3356 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 3357 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 3358 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 3359 grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv); 3360 return grp_info[indexh]; 3361 } 3362 3363 /* 3364 * Reading s_groups_count requires using smp_rmb() afterwards. See 3365 * the locking protocol documented in the comments of ext4_group_add() 3366 * in resize.c 3367 */ 3368 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 3369 { 3370 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 3371 3372 smp_rmb(); 3373 return ngroups; 3374 } 3375 3376 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 3377 ext4_group_t block_group) 3378 { 3379 return block_group >> sbi->s_log_groups_per_flex; 3380 } 3381 3382 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 3383 { 3384 return 1 << sbi->s_log_groups_per_flex; 3385 } 3386 3387 #define ext4_std_error(sb, errno) \ 3388 do { \ 3389 if ((errno)) \ 3390 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 3391 } while (0) 3392 3393 #ifdef CONFIG_SMP 3394 /* Each CPU can accumulate percpu_counter_batch clusters in their local 3395 * counters. So we need to make sure we have free clusters more 3396 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 3397 */ 3398 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 3399 #else 3400 #define EXT4_FREECLUSTERS_WATERMARK 0 3401 #endif 3402 3403 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 3404 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 3405 { 3406 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 3407 !inode_is_locked(inode)); 3408 down_write(&EXT4_I(inode)->i_data_sem); 3409 if (newsize > EXT4_I(inode)->i_disksize) 3410 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize); 3411 up_write(&EXT4_I(inode)->i_data_sem); 3412 } 3413 3414 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 3415 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 3416 { 3417 int changed = 0; 3418 3419 if (newsize > inode->i_size) { 3420 i_size_write(inode, newsize); 3421 changed = 1; 3422 } 3423 if (newsize > EXT4_I(inode)->i_disksize) { 3424 ext4_update_i_disksize(inode, newsize); 3425 changed |= 2; 3426 } 3427 return changed; 3428 } 3429 3430 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 3431 loff_t len); 3432 3433 struct ext4_group_info { 3434 unsigned long bb_state; 3435 #ifdef AGGRESSIVE_CHECK 3436 unsigned long bb_check_counter; 3437 #endif 3438 struct rb_root bb_free_root; 3439 ext4_grpblk_t bb_first_free; /* first free block */ 3440 ext4_grpblk_t bb_free; /* total free blocks */ 3441 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 3442 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 3443 ext4_group_t bb_group; /* Group number */ 3444 struct list_head bb_prealloc_list; 3445 #ifdef DOUBLE_CHECK 3446 void *bb_bitmap; 3447 #endif 3448 struct rw_semaphore alloc_sem; 3449 struct rb_node bb_avg_fragment_size_rb; 3450 struct list_head bb_largest_free_order_node; 3451 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 3452 * regions, index is order. 3453 * bb_counters[3] = 5 means 3454 * 5 free 8-block regions. */ 3455 }; 3456 3457 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 3458 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 3459 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 3460 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 3461 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \ 3462 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT) 3463 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \ 3464 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT) 3465 #define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4 3466 3467 #define EXT4_MB_GRP_NEED_INIT(grp) \ 3468 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 3469 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 3470 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3471 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 3472 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3473 3474 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 3475 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3476 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 3477 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3478 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 3479 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3480 #define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \ 3481 (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state))) 3482 3483 #define EXT4_MAX_CONTENTION 8 3484 #define EXT4_CONTENTION_THRESHOLD 2 3485 3486 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 3487 ext4_group_t group) 3488 { 3489 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 3490 } 3491 3492 /* 3493 * Returns true if the filesystem is busy enough that attempts to 3494 * access the block group locks has run into contention. 3495 */ 3496 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 3497 { 3498 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 3499 } 3500 3501 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 3502 { 3503 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 3504 if (spin_trylock(lock)) 3505 /* 3506 * We're able to grab the lock right away, so drop the 3507 * lock contention counter. 3508 */ 3509 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 3510 else { 3511 /* 3512 * The lock is busy, so bump the contention counter, 3513 * and then wait on the spin lock. 3514 */ 3515 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 3516 EXT4_MAX_CONTENTION); 3517 spin_lock(lock); 3518 } 3519 } 3520 3521 static inline void ext4_unlock_group(struct super_block *sb, 3522 ext4_group_t group) 3523 { 3524 spin_unlock(ext4_group_lock_ptr(sb, group)); 3525 } 3526 3527 #ifdef CONFIG_QUOTA 3528 static inline bool ext4_quota_capable(struct super_block *sb) 3529 { 3530 return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb)); 3531 } 3532 3533 static inline bool ext4_is_quota_journalled(struct super_block *sb) 3534 { 3535 struct ext4_sb_info *sbi = EXT4_SB(sb); 3536 3537 return (ext4_has_feature_quota(sb) || 3538 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]); 3539 } 3540 int ext4_enable_quotas(struct super_block *sb); 3541 #endif 3542 3543 /* 3544 * Block validity checking 3545 */ 3546 #define ext4_check_indirect_blockref(inode, bh) \ 3547 ext4_check_blockref(__func__, __LINE__, inode, \ 3548 (__le32 *)(bh)->b_data, \ 3549 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 3550 3551 #define ext4_ind_check_inode(inode) \ 3552 ext4_check_blockref(__func__, __LINE__, inode, \ 3553 EXT4_I(inode)->i_data, \ 3554 EXT4_NDIR_BLOCKS) 3555 3556 /* 3557 * Inodes and files operations 3558 */ 3559 3560 /* dir.c */ 3561 extern const struct file_operations ext4_dir_operations; 3562 3563 /* file.c */ 3564 extern const struct inode_operations ext4_file_inode_operations; 3565 extern const struct file_operations ext4_file_operations; 3566 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 3567 3568 /* inline.c */ 3569 extern int ext4_get_max_inline_size(struct inode *inode); 3570 extern int ext4_find_inline_data_nolock(struct inode *inode); 3571 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 3572 unsigned int len); 3573 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 3574 3575 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 3576 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 3577 struct inode *inode, 3578 loff_t pos, unsigned len, 3579 unsigned flags, 3580 struct page **pagep); 3581 extern int ext4_write_inline_data_end(struct inode *inode, 3582 loff_t pos, unsigned len, 3583 unsigned copied, 3584 struct page *page); 3585 extern struct buffer_head * 3586 ext4_journalled_write_inline_data(struct inode *inode, 3587 unsigned len, 3588 struct page *page); 3589 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 3590 struct inode *inode, 3591 loff_t pos, unsigned len, 3592 unsigned flags, 3593 struct page **pagep, 3594 void **fsdata); 3595 extern int ext4_try_add_inline_entry(handle_t *handle, 3596 struct ext4_filename *fname, 3597 struct inode *dir, struct inode *inode); 3598 extern int ext4_try_create_inline_dir(handle_t *handle, 3599 struct inode *parent, 3600 struct inode *inode); 3601 extern int ext4_read_inline_dir(struct file *filp, 3602 struct dir_context *ctx, 3603 int *has_inline_data); 3604 extern int ext4_inlinedir_to_tree(struct file *dir_file, 3605 struct inode *dir, ext4_lblk_t block, 3606 struct dx_hash_info *hinfo, 3607 __u32 start_hash, __u32 start_minor_hash, 3608 int *has_inline_data); 3609 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3610 struct ext4_filename *fname, 3611 struct ext4_dir_entry_2 **res_dir, 3612 int *has_inline_data); 3613 extern int ext4_delete_inline_entry(handle_t *handle, 3614 struct inode *dir, 3615 struct ext4_dir_entry_2 *de_del, 3616 struct buffer_head *bh, 3617 int *has_inline_data); 3618 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); 3619 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3620 struct ext4_dir_entry_2 **parent_de, 3621 int *retval); 3622 extern int ext4_inline_data_fiemap(struct inode *inode, 3623 struct fiemap_extent_info *fieinfo, 3624 int *has_inline, __u64 start, __u64 len); 3625 3626 struct iomap; 3627 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap); 3628 3629 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3630 3631 extern int ext4_convert_inline_data(struct inode *inode); 3632 3633 static inline int ext4_has_inline_data(struct inode *inode) 3634 { 3635 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3636 EXT4_I(inode)->i_inline_off; 3637 } 3638 3639 /* namei.c */ 3640 extern const struct inode_operations ext4_dir_inode_operations; 3641 extern const struct inode_operations ext4_special_inode_operations; 3642 extern struct dentry *ext4_get_parent(struct dentry *child); 3643 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3644 struct ext4_dir_entry_2 *de, 3645 int blocksize, int csum_size, 3646 unsigned int parent_ino, int dotdot_real_len); 3647 extern void ext4_initialize_dirent_tail(struct buffer_head *bh, 3648 unsigned int blocksize); 3649 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode, 3650 struct buffer_head *bh); 3651 extern int __ext4_unlink(handle_t *handle, struct inode *dir, const struct qstr *d_name, 3652 struct inode *inode); 3653 extern int __ext4_link(struct inode *dir, struct inode *inode, 3654 struct dentry *dentry); 3655 3656 #define S_SHIFT 12 3657 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = { 3658 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3659 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3660 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3661 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3662 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3663 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3664 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3665 }; 3666 3667 static inline void ext4_set_de_type(struct super_block *sb, 3668 struct ext4_dir_entry_2 *de, 3669 umode_t mode) { 3670 if (ext4_has_feature_filetype(sb)) 3671 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3672 } 3673 3674 /* readpages.c */ 3675 extern int ext4_mpage_readpages(struct inode *inode, 3676 struct readahead_control *rac, struct page *page); 3677 extern int __init ext4_init_post_read_processing(void); 3678 extern void ext4_exit_post_read_processing(void); 3679 3680 /* symlink.c */ 3681 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3682 extern const struct inode_operations ext4_symlink_inode_operations; 3683 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3684 3685 /* sysfs.c */ 3686 extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi); 3687 extern int ext4_register_sysfs(struct super_block *sb); 3688 extern void ext4_unregister_sysfs(struct super_block *sb); 3689 extern int __init ext4_init_sysfs(void); 3690 extern void ext4_exit_sysfs(void); 3691 3692 /* block_validity */ 3693 extern void ext4_release_system_zone(struct super_block *sb); 3694 extern int ext4_setup_system_zone(struct super_block *sb); 3695 extern int __init ext4_init_system_zone(void); 3696 extern void ext4_exit_system_zone(void); 3697 extern int ext4_inode_block_valid(struct inode *inode, 3698 ext4_fsblk_t start_blk, 3699 unsigned int count); 3700 extern int ext4_check_blockref(const char *, unsigned int, 3701 struct inode *, __le32 *, unsigned int); 3702 3703 /* extents.c */ 3704 struct ext4_ext_path; 3705 struct ext4_extent; 3706 3707 /* 3708 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3709 * __le32. 3710 */ 3711 #define EXT_MAX_BLOCKS 0xffffffff 3712 3713 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode); 3714 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3715 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3716 struct ext4_map_blocks *map, int flags); 3717 extern int ext4_ext_truncate(handle_t *, struct inode *); 3718 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3719 ext4_lblk_t end); 3720 extern void ext4_ext_init(struct super_block *); 3721 extern void ext4_ext_release(struct super_block *); 3722 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3723 loff_t len); 3724 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3725 loff_t offset, ssize_t len); 3726 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle, 3727 ext4_io_end_t *io_end); 3728 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3729 struct ext4_map_blocks *map, int flags); 3730 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3731 int num, 3732 struct ext4_ext_path *path); 3733 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3734 struct ext4_ext_path **, 3735 struct ext4_extent *, int); 3736 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3737 struct ext4_ext_path **, 3738 int flags); 3739 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 3740 extern int ext4_ext_check_inode(struct inode *inode); 3741 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3742 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3743 __u64 start, __u64 len); 3744 extern int ext4_get_es_cache(struct inode *inode, 3745 struct fiemap_extent_info *fieinfo, 3746 __u64 start, __u64 len); 3747 extern int ext4_ext_precache(struct inode *inode); 3748 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3749 struct inode *inode2, ext4_lblk_t lblk1, 3750 ext4_lblk_t lblk2, ext4_lblk_t count, 3751 int mark_unwritten,int *err); 3752 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu); 3753 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode, 3754 int check_cred, int restart_cred, 3755 int revoke_cred); 3756 extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end); 3757 extern int ext4_ext_replay_set_iblocks(struct inode *inode); 3758 extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start, 3759 int len, int unwritten, ext4_fsblk_t pblk); 3760 extern int ext4_ext_clear_bb(struct inode *inode); 3761 3762 3763 /* move_extent.c */ 3764 extern void ext4_double_down_write_data_sem(struct inode *first, 3765 struct inode *second); 3766 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3767 struct inode *donor_inode); 3768 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3769 __u64 start_orig, __u64 start_donor, 3770 __u64 len, __u64 *moved_len); 3771 3772 /* page-io.c */ 3773 extern int __init ext4_init_pageio(void); 3774 extern void ext4_exit_pageio(void); 3775 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3776 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3777 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3778 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3779 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3780 struct writeback_control *wbc); 3781 extern void ext4_end_io_rsv_work(struct work_struct *work); 3782 extern void ext4_io_submit(struct ext4_io_submit *io); 3783 extern int ext4_bio_write_page(struct ext4_io_submit *io, 3784 struct page *page, 3785 int len, 3786 bool keep_towrite); 3787 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end); 3788 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end); 3789 3790 /* mmp.c */ 3791 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3792 3793 /* mmp.c */ 3794 extern void ext4_stop_mmpd(struct ext4_sb_info *sbi); 3795 3796 /* verity.c */ 3797 extern const struct fsverity_operations ext4_verityops; 3798 3799 /* orphan.c */ 3800 extern int ext4_orphan_add(handle_t *, struct inode *); 3801 extern int ext4_orphan_del(handle_t *, struct inode *); 3802 extern void ext4_orphan_cleanup(struct super_block *sb, 3803 struct ext4_super_block *es); 3804 extern void ext4_release_orphan_info(struct super_block *sb); 3805 extern int ext4_init_orphan_info(struct super_block *sb); 3806 extern int ext4_orphan_file_empty(struct super_block *sb); 3807 extern void ext4_orphan_file_block_trigger( 3808 struct jbd2_buffer_trigger_type *triggers, 3809 struct buffer_head *bh, 3810 void *data, size_t size); 3811 3812 /* 3813 * Add new method to test whether block and inode bitmaps are properly 3814 * initialized. With uninit_bg reading the block from disk is not enough 3815 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3816 */ 3817 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3818 3819 static inline int bitmap_uptodate(struct buffer_head *bh) 3820 { 3821 return (buffer_uptodate(bh) && 3822 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3823 } 3824 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3825 { 3826 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3827 } 3828 3829 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3830 3831 /* For ioend & aio unwritten conversion wait queues */ 3832 #define EXT4_WQ_HASH_SZ 37 3833 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3834 EXT4_WQ_HASH_SZ]) 3835 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3836 3837 extern int ext4_resize_begin(struct super_block *sb); 3838 extern void ext4_resize_end(struct super_block *sb); 3839 3840 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 3841 struct ext4_io_end *io_end) 3842 { 3843 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 3844 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3845 atomic_inc(&EXT4_I(inode)->i_unwritten); 3846 } 3847 } 3848 3849 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3850 { 3851 struct inode *inode = io_end->inode; 3852 3853 if (io_end->flag & EXT4_IO_END_UNWRITTEN) { 3854 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3855 /* Wake up anyone waiting on unwritten extent conversion */ 3856 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) 3857 wake_up_all(ext4_ioend_wq(inode)); 3858 } 3859 } 3860 3861 extern const struct iomap_ops ext4_iomap_ops; 3862 extern const struct iomap_ops ext4_iomap_overwrite_ops; 3863 extern const struct iomap_ops ext4_iomap_report_ops; 3864 3865 static inline int ext4_buffer_uptodate(struct buffer_head *bh) 3866 { 3867 /* 3868 * If the buffer has the write error flag, we have failed 3869 * to write out data in the block. In this case, we don't 3870 * have to read the block because we may read the old data 3871 * successfully. 3872 */ 3873 if (buffer_write_io_error(bh)) 3874 set_buffer_uptodate(bh); 3875 return buffer_uptodate(bh); 3876 } 3877 3878 #endif /* __KERNEL__ */ 3879 3880 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3881 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3882 3883 #endif /* _EXT4_H */ 3884