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/types.h> 21 #include <linux/blkdev.h> 22 #include <linux/magic.h> 23 #include <linux/jbd2.h> 24 #include <linux/quota.h> 25 #include <linux/rwsem.h> 26 #include <linux/rbtree.h> 27 #include <linux/seqlock.h> 28 #include <linux/mutex.h> 29 #include <linux/timer.h> 30 #include <linux/wait.h> 31 #include <linux/sched/signal.h> 32 #include <linux/blockgroup_lock.h> 33 #include <linux/percpu_counter.h> 34 #include <linux/ratelimit.h> 35 #include <crypto/hash.h> 36 #include <linux/falloc.h> 37 #include <linux/percpu-rwsem.h> 38 #include <linux/fiemap.h> 39 #ifdef __KERNEL__ 40 #include <linux/compat.h> 41 #endif 42 43 #include <linux/fscrypt.h> 44 #include <linux/fsverity.h> 45 46 #include <linux/compiler.h> 47 48 /* 49 * The fourth extended filesystem constants/structures 50 */ 51 52 /* 53 * with AGGRESSIVE_CHECK allocator runs consistency checks over 54 * structures. these checks slow things down a lot 55 */ 56 #define AGGRESSIVE_CHECK__ 57 58 /* 59 * with DOUBLE_CHECK defined mballoc creates persistent in-core 60 * bitmaps, maintains and uses them to check for double allocations 61 */ 62 #define DOUBLE_CHECK__ 63 64 /* 65 * Define EXT4FS_DEBUG to produce debug messages 66 */ 67 #undef EXT4FS_DEBUG 68 69 /* 70 * Debug code 71 */ 72 #ifdef EXT4FS_DEBUG 73 #define ext4_debug(f, a...) \ 74 do { \ 75 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 76 __FILE__, __LINE__, __func__); \ 77 printk(KERN_DEBUG f, ## a); \ 78 } while (0) 79 #else 80 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 81 #endif 82 83 /* 84 * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c 85 */ 86 #define EXT_DEBUG__ 87 88 /* 89 * Dynamic printk for controlled extents debugging. 90 */ 91 #ifdef CONFIG_EXT4_DEBUG 92 #define ext_debug(ino, fmt, ...) \ 93 pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt, \ 94 current->comm, task_pid_nr(current), \ 95 ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__, \ 96 __func__, ##__VA_ARGS__) 97 #else 98 #define ext_debug(ino, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 99 #endif 100 101 #define ASSERT(assert) \ 102 do { \ 103 if (unlikely(!(assert))) { \ 104 printk(KERN_EMERG \ 105 "Assertion failure in %s() at %s:%d: '%s'\n", \ 106 __func__, __FILE__, __LINE__, #assert); \ 107 BUG(); \ 108 } \ 109 } while (0) 110 111 /* data type for block offset of block group */ 112 typedef int ext4_grpblk_t; 113 114 /* data type for filesystem-wide blocks number */ 115 typedef unsigned long long ext4_fsblk_t; 116 117 /* data type for file logical block number */ 118 typedef __u32 ext4_lblk_t; 119 120 /* data type for block group number */ 121 typedef unsigned int ext4_group_t; 122 123 enum SHIFT_DIRECTION { 124 SHIFT_LEFT = 0, 125 SHIFT_RIGHT, 126 }; 127 128 /* 129 * Flags used in mballoc's allocation_context flags field. 130 * 131 * Also used to show what's going on for debugging purposes when the 132 * flag field is exported via the traceport interface 133 */ 134 135 /* prefer goal again. length */ 136 #define EXT4_MB_HINT_MERGE 0x0001 137 /* blocks already reserved */ 138 #define EXT4_MB_HINT_RESERVED 0x0002 139 /* metadata is being allocated */ 140 #define EXT4_MB_HINT_METADATA 0x0004 141 /* first blocks in the file */ 142 #define EXT4_MB_HINT_FIRST 0x0008 143 /* search for the best chunk */ 144 #define EXT4_MB_HINT_BEST 0x0010 145 /* data is being allocated */ 146 #define EXT4_MB_HINT_DATA 0x0020 147 /* don't preallocate (for tails) */ 148 #define EXT4_MB_HINT_NOPREALLOC 0x0040 149 /* allocate for locality group */ 150 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 151 /* allocate goal blocks or none */ 152 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 153 /* goal is meaningful */ 154 #define EXT4_MB_HINT_TRY_GOAL 0x0200 155 /* blocks already pre-reserved by delayed allocation */ 156 #define EXT4_MB_DELALLOC_RESERVED 0x0400 157 /* We are doing stream allocation */ 158 #define EXT4_MB_STREAM_ALLOC 0x0800 159 /* Use reserved root blocks if needed */ 160 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 161 /* Use blocks from reserved pool */ 162 #define EXT4_MB_USE_RESERVED 0x2000 163 /* Do strict check for free blocks while retrying block allocation */ 164 #define EXT4_MB_STRICT_CHECK 0x4000 165 /* Large fragment size list lookup succeeded at least once for cr = 0 */ 166 #define EXT4_MB_CR0_OPTIMIZED 0x8000 167 /* Avg fragment size rb tree lookup succeeded at least once for cr = 1 */ 168 #define EXT4_MB_CR1_OPTIMIZED 0x00010000 169 /* Perform linear traversal for one group */ 170 #define EXT4_MB_SEARCH_NEXT_LINEAR 0x00020000 171 struct ext4_allocation_request { 172 /* target inode for block we're allocating */ 173 struct inode *inode; 174 /* how many blocks we want to allocate */ 175 unsigned int len; 176 /* logical block in target inode */ 177 ext4_lblk_t logical; 178 /* the closest logical allocated block to the left */ 179 ext4_lblk_t lleft; 180 /* the closest logical allocated block to the right */ 181 ext4_lblk_t lright; 182 /* phys. target (a hint) */ 183 ext4_fsblk_t goal; 184 /* phys. block for the closest logical allocated block to the left */ 185 ext4_fsblk_t pleft; 186 /* phys. block for the closest logical allocated block to the right */ 187 ext4_fsblk_t pright; 188 /* flags. see above EXT4_MB_HINT_* */ 189 unsigned int flags; 190 }; 191 192 /* 193 * Logical to physical block mapping, used by ext4_map_blocks() 194 * 195 * This structure is used to pass requests into ext4_map_blocks() as 196 * well as to store the information returned by ext4_map_blocks(). It 197 * takes less room on the stack than a struct buffer_head. 198 */ 199 #define EXT4_MAP_NEW BIT(BH_New) 200 #define EXT4_MAP_MAPPED BIT(BH_Mapped) 201 #define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten) 202 #define EXT4_MAP_BOUNDARY BIT(BH_Boundary) 203 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 204 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 205 206 struct ext4_map_blocks { 207 ext4_fsblk_t m_pblk; 208 ext4_lblk_t m_lblk; 209 unsigned int m_len; 210 unsigned int m_flags; 211 }; 212 213 /* 214 * Block validity checking, system zone rbtree. 215 */ 216 struct ext4_system_blocks { 217 struct rb_root root; 218 struct rcu_head rcu; 219 }; 220 221 /* 222 * Flags for ext4_io_end->flags 223 */ 224 #define EXT4_IO_END_UNWRITTEN 0x0001 225 226 struct ext4_io_end_vec { 227 struct list_head list; /* list of io_end_vec */ 228 loff_t offset; /* offset in the file */ 229 ssize_t size; /* size of the extent */ 230 }; 231 232 /* 233 * For converting unwritten extents on a work queue. 'handle' is used for 234 * buffered writeback. 235 */ 236 typedef struct ext4_io_end { 237 struct list_head list; /* per-file finished IO list */ 238 handle_t *handle; /* handle reserved for extent 239 * conversion */ 240 struct inode *inode; /* file being written to */ 241 struct bio *bio; /* Linked list of completed 242 * bios covering the extent */ 243 unsigned int flag; /* unwritten or not */ 244 atomic_t count; /* reference counter */ 245 struct list_head list_vec; /* list of ext4_io_end_vec */ 246 } ext4_io_end_t; 247 248 struct ext4_io_submit { 249 struct writeback_control *io_wbc; 250 struct bio *io_bio; 251 ext4_io_end_t *io_end; 252 sector_t io_next_block; 253 }; 254 255 /* 256 * Special inodes numbers 257 */ 258 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 259 #define EXT4_ROOT_INO 2 /* Root inode */ 260 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 261 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 262 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 263 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 264 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 265 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 266 267 /* First non-reserved inode for old ext4 filesystems */ 268 #define EXT4_GOOD_OLD_FIRST_INO 11 269 270 /* 271 * Maximal count of links to a file 272 */ 273 #define EXT4_LINK_MAX 65000 274 275 /* 276 * Macro-instructions used to manage several block sizes 277 */ 278 #define EXT4_MIN_BLOCK_SIZE 1024 279 #define EXT4_MAX_BLOCK_SIZE 65536 280 #define EXT4_MIN_BLOCK_LOG_SIZE 10 281 #define EXT4_MAX_BLOCK_LOG_SIZE 16 282 #define EXT4_MAX_CLUSTER_LOG_SIZE 30 283 #ifdef __KERNEL__ 284 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 285 #else 286 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 287 #endif 288 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 289 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 290 EXT4_SB(s)->s_cluster_bits) 291 #ifdef __KERNEL__ 292 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 293 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 294 #else 295 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 296 #endif 297 #ifdef __KERNEL__ 298 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 299 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 300 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 301 #else 302 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 303 EXT4_GOOD_OLD_INODE_SIZE : \ 304 (s)->s_inode_size) 305 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 306 EXT4_GOOD_OLD_FIRST_INO : \ 307 (s)->s_first_ino) 308 #endif 309 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 310 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \ 311 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \ 312 blkbits)) 313 314 /* Translate a block number to a cluster number */ 315 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 316 /* Translate a cluster number to a block number */ 317 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 318 /* Translate # of blks to # of clusters */ 319 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 320 (sbi)->s_cluster_bits) 321 /* Mask out the low bits to get the starting block of the cluster */ 322 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 323 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 324 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 325 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 326 /* Fill in the low bits to get the last block of the cluster */ 327 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \ 328 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1)) 329 /* Get the cluster offset */ 330 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 331 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 332 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 333 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 334 335 /* 336 * Structure of a blocks group descriptor 337 */ 338 struct ext4_group_desc 339 { 340 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 341 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 342 __le32 bg_inode_table_lo; /* Inodes table block */ 343 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 344 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 345 __le16 bg_used_dirs_count_lo; /* Directories count */ 346 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 347 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 348 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 349 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 350 __le16 bg_itable_unused_lo; /* Unused inodes count */ 351 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 352 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 353 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 354 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 355 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 356 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 357 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 358 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 359 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 360 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 361 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 362 __u32 bg_reserved; 363 }; 364 365 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 366 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 367 sizeof(__le16)) 368 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 369 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 370 sizeof(__le16)) 371 372 /* 373 * Structure of a flex block group info 374 */ 375 376 struct flex_groups { 377 atomic64_t free_clusters; 378 atomic_t free_inodes; 379 atomic_t used_dirs; 380 }; 381 382 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 383 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 384 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 385 386 /* 387 * Macro-instructions used to manage group descriptors 388 */ 389 #define EXT4_MIN_DESC_SIZE 32 390 #define EXT4_MIN_DESC_SIZE_64BIT 64 391 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 392 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 393 #ifdef __KERNEL__ 394 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 395 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 396 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 397 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 398 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 399 #else 400 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 401 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 402 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 403 #endif 404 405 /* 406 * Constants relative to the data blocks 407 */ 408 #define EXT4_NDIR_BLOCKS 12 409 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 410 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 411 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 412 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 413 414 /* 415 * Inode flags 416 */ 417 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 418 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 419 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 420 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 421 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 422 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 423 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 424 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 425 /* Reserved for compression usage... */ 426 #define EXT4_DIRTY_FL 0x00000100 427 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 428 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 429 /* nb: was previously EXT2_ECOMPR_FL */ 430 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 431 /* End compression flags --- maybe not all used */ 432 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 433 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 434 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 435 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 436 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 437 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 438 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 439 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 440 #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */ 441 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 442 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */ 443 444 #define EXT4_DAX_FL 0x02000000 /* Inode is DAX */ 445 446 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 447 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 448 #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */ 449 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 450 451 /* User modifiable flags */ 452 #define EXT4_FL_USER_MODIFIABLE (EXT4_SECRM_FL | \ 453 EXT4_UNRM_FL | \ 454 EXT4_COMPR_FL | \ 455 EXT4_SYNC_FL | \ 456 EXT4_IMMUTABLE_FL | \ 457 EXT4_APPEND_FL | \ 458 EXT4_NODUMP_FL | \ 459 EXT4_NOATIME_FL | \ 460 EXT4_JOURNAL_DATA_FL | \ 461 EXT4_NOTAIL_FL | \ 462 EXT4_DIRSYNC_FL | \ 463 EXT4_TOPDIR_FL | \ 464 EXT4_EXTENTS_FL | \ 465 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \ 466 EXT4_DAX_FL | \ 467 EXT4_PROJINHERIT_FL | \ 468 EXT4_CASEFOLD_FL) 469 470 /* User visible flags */ 471 #define EXT4_FL_USER_VISIBLE (EXT4_FL_USER_MODIFIABLE | \ 472 EXT4_DIRTY_FL | \ 473 EXT4_COMPRBLK_FL | \ 474 EXT4_NOCOMPR_FL | \ 475 EXT4_ENCRYPT_FL | \ 476 EXT4_INDEX_FL | \ 477 EXT4_VERITY_FL | \ 478 EXT4_INLINE_DATA_FL) 479 480 /* Flags that should be inherited by new inodes from their parent. */ 481 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 482 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 483 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 484 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 485 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\ 486 EXT4_DAX_FL) 487 488 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 489 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\ 490 EXT4_PROJINHERIT_FL)) 491 492 /* Flags that are appropriate for non-directories/regular files. */ 493 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 494 495 /* The only flags that should be swapped */ 496 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL) 497 498 /* Flags which are mutually exclusive to DAX */ 499 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\ 500 EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL) 501 502 /* Mask out flags that are inappropriate for the given type of inode. */ 503 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 504 { 505 if (S_ISDIR(mode)) 506 return flags; 507 else if (S_ISREG(mode)) 508 return flags & EXT4_REG_FLMASK; 509 else 510 return flags & EXT4_OTHER_FLMASK; 511 } 512 513 /* 514 * Inode flags used for atomic set/get 515 */ 516 enum { 517 EXT4_INODE_SECRM = 0, /* Secure deletion */ 518 EXT4_INODE_UNRM = 1, /* Undelete */ 519 EXT4_INODE_COMPR = 2, /* Compress file */ 520 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 521 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 522 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 523 EXT4_INODE_NODUMP = 6, /* do not dump file */ 524 EXT4_INODE_NOATIME = 7, /* do not update atime */ 525 /* Reserved for compression usage... */ 526 EXT4_INODE_DIRTY = 8, 527 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 528 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 529 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 530 /* End compression flags --- maybe not all used */ 531 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 532 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 533 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 534 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 535 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 536 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 537 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 538 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 539 EXT4_INODE_VERITY = 20, /* Verity protected inode */ 540 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 541 /* 22 was formerly EXT4_INODE_EOFBLOCKS */ 542 EXT4_INODE_DAX = 25, /* Inode is DAX */ 543 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 544 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 545 EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */ 546 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 547 }; 548 549 /* 550 * Since it's pretty easy to mix up bit numbers and hex values, we use a 551 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 552 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 553 * any extra space in the compiled kernel image, otherwise, the build will fail. 554 * It's important that these values are the same, since we are using 555 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 556 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 557 * values found in ext2, ext3 and ext4 filesystems, and of course the values 558 * defined in e2fsprogs. 559 * 560 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 561 */ 562 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 563 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 564 565 static inline void ext4_check_flag_values(void) 566 { 567 CHECK_FLAG_VALUE(SECRM); 568 CHECK_FLAG_VALUE(UNRM); 569 CHECK_FLAG_VALUE(COMPR); 570 CHECK_FLAG_VALUE(SYNC); 571 CHECK_FLAG_VALUE(IMMUTABLE); 572 CHECK_FLAG_VALUE(APPEND); 573 CHECK_FLAG_VALUE(NODUMP); 574 CHECK_FLAG_VALUE(NOATIME); 575 CHECK_FLAG_VALUE(DIRTY); 576 CHECK_FLAG_VALUE(COMPRBLK); 577 CHECK_FLAG_VALUE(NOCOMPR); 578 CHECK_FLAG_VALUE(ENCRYPT); 579 CHECK_FLAG_VALUE(INDEX); 580 CHECK_FLAG_VALUE(IMAGIC); 581 CHECK_FLAG_VALUE(JOURNAL_DATA); 582 CHECK_FLAG_VALUE(NOTAIL); 583 CHECK_FLAG_VALUE(DIRSYNC); 584 CHECK_FLAG_VALUE(TOPDIR); 585 CHECK_FLAG_VALUE(HUGE_FILE); 586 CHECK_FLAG_VALUE(EXTENTS); 587 CHECK_FLAG_VALUE(VERITY); 588 CHECK_FLAG_VALUE(EA_INODE); 589 CHECK_FLAG_VALUE(INLINE_DATA); 590 CHECK_FLAG_VALUE(PROJINHERIT); 591 CHECK_FLAG_VALUE(CASEFOLD); 592 CHECK_FLAG_VALUE(RESERVED); 593 } 594 595 /* Used to pass group descriptor data when online resize is done */ 596 struct ext4_new_group_input { 597 __u32 group; /* Group number for this data */ 598 __u64 block_bitmap; /* Absolute block number of block bitmap */ 599 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 600 __u64 inode_table; /* Absolute block number of inode table start */ 601 __u32 blocks_count; /* Total number of blocks in this group */ 602 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 603 __u16 unused; 604 }; 605 606 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 607 struct compat_ext4_new_group_input { 608 u32 group; 609 compat_u64 block_bitmap; 610 compat_u64 inode_bitmap; 611 compat_u64 inode_table; 612 u32 blocks_count; 613 u16 reserved_blocks; 614 u16 unused; 615 }; 616 #endif 617 618 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 619 struct ext4_new_group_data { 620 __u32 group; 621 __u64 block_bitmap; 622 __u64 inode_bitmap; 623 __u64 inode_table; 624 __u32 blocks_count; 625 __u16 reserved_blocks; 626 __u16 mdata_blocks; 627 __u32 free_clusters_count; 628 }; 629 630 /* Indexes used to index group tables in ext4_new_group_data */ 631 enum { 632 BLOCK_BITMAP = 0, /* block bitmap */ 633 INODE_BITMAP, /* inode bitmap */ 634 INODE_TABLE, /* inode tables */ 635 GROUP_TABLE_COUNT, 636 }; 637 638 /* 639 * Flags used by ext4_map_blocks() 640 */ 641 /* Allocate any needed blocks and/or convert an unwritten 642 extent to be an initialized ext4 */ 643 #define EXT4_GET_BLOCKS_CREATE 0x0001 644 /* Request the creation of an unwritten extent */ 645 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 646 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 647 EXT4_GET_BLOCKS_CREATE) 648 /* Caller is from the delayed allocation writeout path 649 * finally doing the actual allocation of delayed blocks */ 650 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 651 /* caller is from the direct IO path, request to creation of an 652 unwritten extents if not allocated, split the unwritten 653 extent if blocks has been preallocated already*/ 654 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 655 #define EXT4_GET_BLOCKS_CONVERT 0x0010 656 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 657 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 658 /* Convert extent to initialized after IO complete */ 659 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 660 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 661 /* Eventual metadata allocation (due to growing extent tree) 662 * should not fail, so try to use reserved blocks for that.*/ 663 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 664 /* Don't normalize allocation size (used for fallocate) */ 665 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 666 /* Convert written extents to unwritten */ 667 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 668 /* Write zeros to newly created written extents */ 669 #define EXT4_GET_BLOCKS_ZERO 0x0200 670 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 671 EXT4_GET_BLOCKS_ZERO) 672 /* Caller will submit data before dropping transaction handle. This 673 * allows jbd2 to avoid submitting data before commit. */ 674 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 675 676 /* 677 * The bit position of these flags must not overlap with any of the 678 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 679 * read_extent_tree_block(), ext4_split_extent_at(), 680 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 681 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 682 * caching the extents when reading from the extent tree while a 683 * truncate or punch hole operation is in progress. 684 */ 685 #define EXT4_EX_NOCACHE 0x40000000 686 #define EXT4_EX_FORCE_CACHE 0x20000000 687 #define EXT4_EX_NOFAIL 0x10000000 688 689 /* 690 * Flags used by ext4_free_blocks 691 */ 692 #define EXT4_FREE_BLOCKS_METADATA 0x0001 693 #define EXT4_FREE_BLOCKS_FORGET 0x0002 694 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 695 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 696 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 697 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 698 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040 699 700 /* 701 * ioctl commands 702 */ 703 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 704 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 705 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 706 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 707 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 708 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 709 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 710 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 711 #define EXT4_IOC_MIGRATE _IO('f', 9) 712 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 713 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 714 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 715 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 716 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 717 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 718 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 719 /* ioctl codes 19--39 are reserved for fscrypt */ 720 #define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40) 721 #define EXT4_IOC_GETSTATE _IOW('f', 41, __u32) 722 #define EXT4_IOC_GET_ES_CACHE _IOWR('f', 42, struct fiemap) 723 #define EXT4_IOC_CHECKPOINT _IOW('f', 43, __u32) 724 725 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32) 726 727 /* 728 * Flags for going down operation 729 */ 730 #define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */ 731 #define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */ 732 #define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */ 733 734 /* 735 * Flags returned by EXT4_IOC_GETSTATE 736 * 737 * We only expose to userspace a subset of the state flags in 738 * i_state_flags 739 */ 740 #define EXT4_STATE_FLAG_EXT_PRECACHED 0x00000001 741 #define EXT4_STATE_FLAG_NEW 0x00000002 742 #define EXT4_STATE_FLAG_NEWENTRY 0x00000004 743 #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE 0x00000008 744 745 /* flags for ioctl EXT4_IOC_CHECKPOINT */ 746 #define EXT4_IOC_CHECKPOINT_FLAG_DISCARD 0x1 747 #define EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT 0x2 748 #define EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN 0x4 749 #define EXT4_IOC_CHECKPOINT_FLAG_VALID (EXT4_IOC_CHECKPOINT_FLAG_DISCARD | \ 750 EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT | \ 751 EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN) 752 753 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 754 /* 755 * ioctl commands in 32 bit emulation 756 */ 757 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 758 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 759 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 760 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 761 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 762 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 763 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 764 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 765 #endif 766 767 /* 768 * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag. 769 * It indicates that the entry in extent status cache is for a hole. 770 */ 771 #define EXT4_FIEMAP_EXTENT_HOLE 0x08000000 772 773 /* Max physical block we can address w/o extents */ 774 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 775 776 /* Max logical block we can support */ 777 #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE 778 779 /* 780 * Structure of an inode on the disk 781 */ 782 struct ext4_inode { 783 __le16 i_mode; /* File mode */ 784 __le16 i_uid; /* Low 16 bits of Owner Uid */ 785 __le32 i_size_lo; /* Size in bytes */ 786 __le32 i_atime; /* Access time */ 787 __le32 i_ctime; /* Inode Change time */ 788 __le32 i_mtime; /* Modification time */ 789 __le32 i_dtime; /* Deletion Time */ 790 __le16 i_gid; /* Low 16 bits of Group Id */ 791 __le16 i_links_count; /* Links count */ 792 __le32 i_blocks_lo; /* Blocks count */ 793 __le32 i_flags; /* File flags */ 794 union { 795 struct { 796 __le32 l_i_version; 797 } linux1; 798 struct { 799 __u32 h_i_translator; 800 } hurd1; 801 struct { 802 __u32 m_i_reserved1; 803 } masix1; 804 } osd1; /* OS dependent 1 */ 805 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 806 __le32 i_generation; /* File version (for NFS) */ 807 __le32 i_file_acl_lo; /* File ACL */ 808 __le32 i_size_high; 809 __le32 i_obso_faddr; /* Obsoleted fragment address */ 810 union { 811 struct { 812 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 813 __le16 l_i_file_acl_high; 814 __le16 l_i_uid_high; /* these 2 fields */ 815 __le16 l_i_gid_high; /* were reserved2[0] */ 816 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 817 __le16 l_i_reserved; 818 } linux2; 819 struct { 820 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 821 __u16 h_i_mode_high; 822 __u16 h_i_uid_high; 823 __u16 h_i_gid_high; 824 __u32 h_i_author; 825 } hurd2; 826 struct { 827 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 828 __le16 m_i_file_acl_high; 829 __u32 m_i_reserved2[2]; 830 } masix2; 831 } osd2; /* OS dependent 2 */ 832 __le16 i_extra_isize; 833 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 834 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 835 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 836 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 837 __le32 i_crtime; /* File Creation time */ 838 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 839 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 840 __le32 i_projid; /* Project ID */ 841 }; 842 843 struct move_extent { 844 __u32 reserved; /* should be zero */ 845 __u32 donor_fd; /* donor file descriptor */ 846 __u64 orig_start; /* logical start offset in block for orig */ 847 __u64 donor_start; /* logical start offset in block for donor */ 848 __u64 len; /* block length to be moved */ 849 __u64 moved_len; /* moved block length */ 850 }; 851 852 #define EXT4_EPOCH_BITS 2 853 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 854 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 855 856 /* 857 * Extended fields will fit into an inode if the filesystem was formatted 858 * with large inodes (-I 256 or larger) and there are not currently any EAs 859 * consuming all of the available space. For new inodes we always reserve 860 * enough space for the kernel's known extended fields, but for inodes 861 * created with an old kernel this might not have been the case. None of 862 * the extended inode fields is critical for correct filesystem operation. 863 * This macro checks if a certain field fits in the inode. Note that 864 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 865 */ 866 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 867 ((offsetof(typeof(*ext4_inode), field) + \ 868 sizeof((ext4_inode)->field)) \ 869 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 870 (einode)->i_extra_isize)) \ 871 872 /* 873 * We use an encoding that preserves the times for extra epoch "00": 874 * 875 * extra msb of adjust for signed 876 * epoch 32-bit 32-bit tv_sec to 877 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 878 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 879 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 880 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 881 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 882 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 883 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 884 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 885 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 886 * 887 * Note that previous versions of the kernel on 64-bit systems would 888 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 889 * 1970. e2fsck will correct this, assuming that it is run on the 890 * affected filesystem before 2242. 891 */ 892 893 static inline __le32 ext4_encode_extra_time(struct timespec64 *time) 894 { 895 u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK; 896 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); 897 } 898 899 static inline void ext4_decode_extra_time(struct timespec64 *time, 900 __le32 extra) 901 { 902 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) 903 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 904 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 905 } 906 907 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 908 do { \ 909 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\ 910 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 911 (raw_inode)->xtime ## _extra = \ 912 ext4_encode_extra_time(&(inode)->xtime); \ 913 } \ 914 else \ 915 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX)); \ 916 } while (0) 917 918 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 919 do { \ 920 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 921 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 922 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 923 (raw_inode)->xtime ## _extra = \ 924 ext4_encode_extra_time(&(einode)->xtime); \ 925 } while (0) 926 927 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 928 do { \ 929 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 930 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \ 931 ext4_decode_extra_time(&(inode)->xtime, \ 932 raw_inode->xtime ## _extra); \ 933 } \ 934 else \ 935 (inode)->xtime.tv_nsec = 0; \ 936 } while (0) 937 938 939 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 940 do { \ 941 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 942 (einode)->xtime.tv_sec = \ 943 (signed)le32_to_cpu((raw_inode)->xtime); \ 944 else \ 945 (einode)->xtime.tv_sec = 0; \ 946 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 947 ext4_decode_extra_time(&(einode)->xtime, \ 948 raw_inode->xtime ## _extra); \ 949 else \ 950 (einode)->xtime.tv_nsec = 0; \ 951 } while (0) 952 953 #define i_disk_version osd1.linux1.l_i_version 954 955 #if defined(__KERNEL__) || defined(__linux__) 956 #define i_reserved1 osd1.linux1.l_i_reserved1 957 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 958 #define i_blocks_high osd2.linux2.l_i_blocks_high 959 #define i_uid_low i_uid 960 #define i_gid_low i_gid 961 #define i_uid_high osd2.linux2.l_i_uid_high 962 #define i_gid_high osd2.linux2.l_i_gid_high 963 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 964 965 #elif defined(__GNU__) 966 967 #define i_translator osd1.hurd1.h_i_translator 968 #define i_uid_high osd2.hurd2.h_i_uid_high 969 #define i_gid_high osd2.hurd2.h_i_gid_high 970 #define i_author osd2.hurd2.h_i_author 971 972 #elif defined(__masix__) 973 974 #define i_reserved1 osd1.masix1.m_i_reserved1 975 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 976 #define i_reserved2 osd2.masix2.m_i_reserved2 977 978 #endif /* defined(__KERNEL__) || defined(__linux__) */ 979 980 #include "extents_status.h" 981 #include "fast_commit.h" 982 983 /* 984 * Lock subclasses for i_data_sem in the ext4_inode_info structure. 985 * 986 * These are needed to avoid lockdep false positives when we need to 987 * allocate blocks to the quota inode during ext4_map_blocks(), while 988 * holding i_data_sem for a normal (non-quota) inode. Since we don't 989 * do quota tracking for the quota inode, this avoids deadlock (as 990 * well as infinite recursion, since it isn't turtles all the way 991 * down...) 992 * 993 * I_DATA_SEM_NORMAL - Used for most inodes 994 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode 995 * where the second inode has larger inode number 996 * than the first 997 * I_DATA_SEM_QUOTA - Used for quota inodes only 998 */ 999 enum { 1000 I_DATA_SEM_NORMAL = 0, 1001 I_DATA_SEM_OTHER, 1002 I_DATA_SEM_QUOTA, 1003 }; 1004 1005 1006 /* 1007 * fourth extended file system inode data in memory 1008 */ 1009 struct ext4_inode_info { 1010 __le32 i_data[15]; /* unconverted */ 1011 __u32 i_dtime; 1012 ext4_fsblk_t i_file_acl; 1013 1014 /* 1015 * i_block_group is the number of the block group which contains 1016 * this file's inode. Constant across the lifetime of the inode, 1017 * it is used for making block allocation decisions - we try to 1018 * place a file's data blocks near its inode block, and new inodes 1019 * near to their parent directory's inode. 1020 */ 1021 ext4_group_t i_block_group; 1022 ext4_lblk_t i_dir_start_lookup; 1023 #if (BITS_PER_LONG < 64) 1024 unsigned long i_state_flags; /* Dynamic state flags */ 1025 #endif 1026 unsigned long i_flags; 1027 1028 /* 1029 * Extended attributes can be read independently of the main file 1030 * data. Taking i_mutex even when reading would cause contention 1031 * between readers of EAs and writers of regular file data, so 1032 * instead we synchronize on xattr_sem when reading or changing 1033 * EAs. 1034 */ 1035 struct rw_semaphore xattr_sem; 1036 1037 struct list_head i_orphan; /* unlinked but open inodes */ 1038 1039 /* Fast commit related info */ 1040 1041 struct list_head i_fc_list; /* 1042 * inodes that need fast commit 1043 * protected by sbi->s_fc_lock. 1044 */ 1045 1046 /* Start of lblk range that needs to be committed in this fast commit */ 1047 ext4_lblk_t i_fc_lblk_start; 1048 1049 /* End of lblk range that needs to be committed in this fast commit */ 1050 ext4_lblk_t i_fc_lblk_len; 1051 1052 /* Number of ongoing updates on this inode */ 1053 atomic_t i_fc_updates; 1054 1055 /* Fast commit wait queue for this inode */ 1056 wait_queue_head_t i_fc_wait; 1057 1058 /* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */ 1059 struct mutex i_fc_lock; 1060 1061 /* 1062 * i_disksize keeps track of what the inode size is ON DISK, not 1063 * in memory. During truncate, i_size is set to the new size by 1064 * the VFS prior to calling ext4_truncate(), but the filesystem won't 1065 * set i_disksize to 0 until the truncate is actually under way. 1066 * 1067 * The intent is that i_disksize always represents the blocks which 1068 * are used by this file. This allows recovery to restart truncate 1069 * on orphans if we crash during truncate. We actually write i_disksize 1070 * into the on-disk inode when writing inodes out, instead of i_size. 1071 * 1072 * The only time when i_disksize and i_size may be different is when 1073 * a truncate is in progress. The only things which change i_disksize 1074 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 1075 */ 1076 loff_t i_disksize; 1077 1078 /* 1079 * i_data_sem is for serialising ext4_truncate() against 1080 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 1081 * data tree are chopped off during truncate. We can't do that in 1082 * ext4 because whenever we perform intermediate commits during 1083 * truncate, the inode and all the metadata blocks *must* be in a 1084 * consistent state which allows truncation of the orphans to restart 1085 * during recovery. Hence we must fix the get_block-vs-truncate race 1086 * by other means, so we have i_data_sem. 1087 */ 1088 struct rw_semaphore i_data_sem; 1089 /* 1090 * i_mmap_sem is for serializing page faults with truncate / punch hole 1091 * operations. We have to make sure that new page cannot be faulted in 1092 * a section of the inode that is being punched. We cannot easily use 1093 * i_data_sem for this since we need protection for the whole punch 1094 * operation and i_data_sem ranks below transaction start so we have 1095 * to occasionally drop it. 1096 */ 1097 struct rw_semaphore i_mmap_sem; 1098 struct inode vfs_inode; 1099 struct jbd2_inode *jinode; 1100 1101 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 1102 1103 /* 1104 * File creation time. Its function is same as that of 1105 * struct timespec64 i_{a,c,m}time in the generic inode. 1106 */ 1107 struct timespec64 i_crtime; 1108 1109 /* mballoc */ 1110 atomic_t i_prealloc_active; 1111 struct list_head i_prealloc_list; 1112 spinlock_t i_prealloc_lock; 1113 1114 /* extents status tree */ 1115 struct ext4_es_tree i_es_tree; 1116 rwlock_t i_es_lock; 1117 struct list_head i_es_list; 1118 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1119 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1120 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1121 extents to shrink. Protected by 1122 i_es_lock */ 1123 1124 /* ialloc */ 1125 ext4_group_t i_last_alloc_group; 1126 1127 /* allocation reservation info for delalloc */ 1128 /* In case of bigalloc, this refer to clusters rather than blocks */ 1129 unsigned int i_reserved_data_blocks; 1130 1131 /* pending cluster reservations for bigalloc file systems */ 1132 struct ext4_pending_tree i_pending_tree; 1133 1134 /* on-disk additional length */ 1135 __u16 i_extra_isize; 1136 1137 /* Indicate the inline data space. */ 1138 u16 i_inline_off; 1139 u16 i_inline_size; 1140 1141 #ifdef CONFIG_QUOTA 1142 /* quota space reservation, managed internally by quota code */ 1143 qsize_t i_reserved_quota; 1144 #endif 1145 1146 /* Lock protecting lists below */ 1147 spinlock_t i_completed_io_lock; 1148 /* 1149 * Completed IOs that need unwritten extents handling and have 1150 * transaction reserved 1151 */ 1152 struct list_head i_rsv_conversion_list; 1153 struct work_struct i_rsv_conversion_work; 1154 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 1155 1156 spinlock_t i_block_reservation_lock; 1157 1158 /* 1159 * Transactions that contain inode's metadata needed to complete 1160 * fsync and fdatasync, respectively. 1161 */ 1162 tid_t i_sync_tid; 1163 tid_t i_datasync_tid; 1164 1165 #ifdef CONFIG_QUOTA 1166 struct dquot *i_dquot[MAXQUOTAS]; 1167 #endif 1168 1169 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1170 __u32 i_csum_seed; 1171 1172 kprojid_t i_projid; 1173 }; 1174 1175 /* 1176 * File system states 1177 */ 1178 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1179 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1180 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1181 #define EXT4_FC_REPLAY 0x0020 /* Fast commit replay ongoing */ 1182 1183 /* 1184 * Misc. filesystem flags 1185 */ 1186 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1187 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1188 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1189 1190 /* 1191 * Mount flags set via mount options or defaults 1192 */ 1193 #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */ 1194 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1195 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1196 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1197 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1198 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1199 #define EXT4_MOUNT_ERRORS_MASK 0x00070 1200 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1201 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1202 #ifdef CONFIG_FS_DAX 1203 #define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */ 1204 #else 1205 #define EXT4_MOUNT_DAX_ALWAYS 0 1206 #endif 1207 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1208 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1209 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1210 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1211 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1212 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1213 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1214 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1215 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1216 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1217 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */ 1218 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota, 1219 * enable enforcement for hidden 1220 * quota files */ 1221 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable 1222 * enforcement for hidden quota 1223 * files */ 1224 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota 1225 * enforcement */ 1226 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1227 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1228 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1229 #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */ 1230 #define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000 1231 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1232 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1233 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1234 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1235 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1236 1237 /* 1238 * Mount flags set either automatically (could not be set by mount option) 1239 * based on per file system feature or property or in special cases such as 1240 * distinguishing between explicit mount option definition and default. 1241 */ 1242 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1243 specified delalloc */ 1244 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1245 size of blocksize * 8 1246 blocks */ 1247 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1248 file systems */ 1249 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1250 specified journal checksum */ 1251 1252 #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */ 1253 #define EXT4_MOUNT2_DAX_NEVER 0x00000020 /* Do not allow Direct Access */ 1254 #define EXT4_MOUNT2_DAX_INODE 0x00000040 /* For printing options only */ 1255 #define EXT4_MOUNT2_MB_OPTIMIZE_SCAN 0x00000080 /* Optimize group 1256 * scanning in mballoc 1257 */ 1258 1259 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1260 ~EXT4_MOUNT_##opt 1261 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1262 EXT4_MOUNT_##opt 1263 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1264 EXT4_MOUNT_##opt) 1265 1266 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1267 ~EXT4_MOUNT2_##opt 1268 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1269 EXT4_MOUNT2_##opt 1270 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1271 EXT4_MOUNT2_##opt) 1272 1273 #define ext4_test_and_set_bit __test_and_set_bit_le 1274 #define ext4_set_bit __set_bit_le 1275 #define ext4_set_bit_atomic ext2_set_bit_atomic 1276 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1277 #define ext4_clear_bit __clear_bit_le 1278 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1279 #define ext4_test_bit test_bit_le 1280 #define ext4_find_next_zero_bit find_next_zero_bit_le 1281 #define ext4_find_next_bit find_next_bit_le 1282 1283 extern void ext4_set_bits(void *bm, int cur, int len); 1284 1285 /* 1286 * Maximal mount counts between two filesystem checks 1287 */ 1288 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1289 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1290 1291 /* 1292 * Behaviour when detecting errors 1293 */ 1294 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1295 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1296 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1297 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1298 1299 /* Metadata checksum algorithm codes */ 1300 #define EXT4_CRC32C_CHKSUM 1 1301 1302 /* 1303 * Structure of the super block 1304 */ 1305 struct ext4_super_block { 1306 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1307 __le32 s_blocks_count_lo; /* Blocks count */ 1308 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1309 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1310 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1311 __le32 s_first_data_block; /* First Data Block */ 1312 __le32 s_log_block_size; /* Block size */ 1313 __le32 s_log_cluster_size; /* Allocation cluster size */ 1314 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1315 __le32 s_clusters_per_group; /* # Clusters per group */ 1316 __le32 s_inodes_per_group; /* # Inodes per group */ 1317 __le32 s_mtime; /* Mount time */ 1318 /*30*/ __le32 s_wtime; /* Write time */ 1319 __le16 s_mnt_count; /* Mount count */ 1320 __le16 s_max_mnt_count; /* Maximal mount count */ 1321 __le16 s_magic; /* Magic signature */ 1322 __le16 s_state; /* File system state */ 1323 __le16 s_errors; /* Behaviour when detecting errors */ 1324 __le16 s_minor_rev_level; /* minor revision level */ 1325 /*40*/ __le32 s_lastcheck; /* time of last check */ 1326 __le32 s_checkinterval; /* max. time between checks */ 1327 __le32 s_creator_os; /* OS */ 1328 __le32 s_rev_level; /* Revision level */ 1329 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1330 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1331 /* 1332 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1333 * 1334 * Note: the difference between the compatible feature set and 1335 * the incompatible feature set is that if there is a bit set 1336 * in the incompatible feature set that the kernel doesn't 1337 * know about, it should refuse to mount the filesystem. 1338 * 1339 * e2fsck's requirements are more strict; if it doesn't know 1340 * about a feature in either the compatible or incompatible 1341 * feature set, it must abort and not try to meddle with 1342 * things it doesn't understand... 1343 */ 1344 __le32 s_first_ino; /* First non-reserved inode */ 1345 __le16 s_inode_size; /* size of inode structure */ 1346 __le16 s_block_group_nr; /* block group # of this superblock */ 1347 __le32 s_feature_compat; /* compatible feature set */ 1348 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1349 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1350 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1351 /*78*/ char s_volume_name[16]; /* volume name */ 1352 /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */ 1353 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1354 /* 1355 * Performance hints. Directory preallocation should only 1356 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1357 */ 1358 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1359 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1360 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1361 /* 1362 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1363 */ 1364 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1365 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1366 __le32 s_journal_dev; /* device number of journal file */ 1367 __le32 s_last_orphan; /* start of list of inodes to delete */ 1368 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1369 __u8 s_def_hash_version; /* Default hash version to use */ 1370 __u8 s_jnl_backup_type; 1371 __le16 s_desc_size; /* size of group descriptor */ 1372 /*100*/ __le32 s_default_mount_opts; 1373 __le32 s_first_meta_bg; /* First metablock block group */ 1374 __le32 s_mkfs_time; /* When the filesystem was created */ 1375 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1376 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1377 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1378 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1379 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1380 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1381 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1382 __le32 s_flags; /* Miscellaneous flags */ 1383 __le16 s_raid_stride; /* RAID stride */ 1384 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1385 __le64 s_mmp_block; /* Block for multi-mount protection */ 1386 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1387 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1388 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1389 __u8 s_encryption_level; /* versioning level for encryption */ 1390 __u8 s_reserved_pad; /* Padding to next 32bits */ 1391 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1392 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1393 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1394 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1395 snapshot's future use */ 1396 __le32 s_snapshot_list; /* inode number of the head of the 1397 on-disk snapshot list */ 1398 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1399 __le32 s_error_count; /* number of fs errors */ 1400 __le32 s_first_error_time; /* first time an error happened */ 1401 __le32 s_first_error_ino; /* inode involved in first error */ 1402 __le64 s_first_error_block; /* block involved of first error */ 1403 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */ 1404 __le32 s_first_error_line; /* line number where error happened */ 1405 __le32 s_last_error_time; /* most recent time of an error */ 1406 __le32 s_last_error_ino; /* inode involved in last error */ 1407 __le32 s_last_error_line; /* line number where error happened */ 1408 __le64 s_last_error_block; /* block involved of last error */ 1409 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */ 1410 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1411 __u8 s_mount_opts[64]; 1412 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1413 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1414 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1415 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1416 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1417 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1418 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1419 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1420 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1421 __u8 s_wtime_hi; 1422 __u8 s_mtime_hi; 1423 __u8 s_mkfs_time_hi; 1424 __u8 s_lastcheck_hi; 1425 __u8 s_first_error_time_hi; 1426 __u8 s_last_error_time_hi; 1427 __u8 s_first_error_errcode; 1428 __u8 s_last_error_errcode; 1429 __le16 s_encoding; /* Filename charset encoding */ 1430 __le16 s_encoding_flags; /* Filename charset encoding flags */ 1431 __le32 s_reserved[95]; /* 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 /* 1451 * fourth extended-fs super-block data in memory 1452 */ 1453 struct ext4_sb_info { 1454 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1455 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1456 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1457 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1458 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1459 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1460 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1461 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1462 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1463 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1464 unsigned long s_overhead; /* # of fs overhead clusters */ 1465 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1466 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1467 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1468 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1469 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1470 struct buffer_head * __rcu *s_group_desc; 1471 unsigned int s_mount_opt; 1472 unsigned int s_mount_opt2; 1473 unsigned long s_mount_flags; 1474 unsigned int s_def_mount_opt; 1475 ext4_fsblk_t s_sb_block; 1476 atomic64_t s_resv_clusters; 1477 kuid_t s_resuid; 1478 kgid_t s_resgid; 1479 unsigned short s_mount_state; 1480 unsigned short s_pad; 1481 int s_addr_per_block_bits; 1482 int s_desc_per_block_bits; 1483 int s_inode_size; 1484 int s_first_ino; 1485 unsigned int s_inode_readahead_blks; 1486 unsigned int s_inode_goal; 1487 u32 s_hash_seed[4]; 1488 int s_def_hash_version; 1489 int s_hash_unsigned; /* 3 if hash should be unsigned, 0 if not */ 1490 struct percpu_counter s_freeclusters_counter; 1491 struct percpu_counter s_freeinodes_counter; 1492 struct percpu_counter s_dirs_counter; 1493 struct percpu_counter s_dirtyclusters_counter; 1494 struct percpu_counter s_sra_exceeded_retry_limit; 1495 struct blockgroup_lock *s_blockgroup_lock; 1496 struct proc_dir_entry *s_proc; 1497 struct kobject s_kobj; 1498 struct completion s_kobj_unregister; 1499 struct super_block *s_sb; 1500 struct buffer_head *s_mmp_bh; 1501 1502 /* Journaling */ 1503 struct journal_s *s_journal; 1504 struct list_head s_orphan; 1505 struct mutex s_orphan_lock; 1506 unsigned long s_ext4_flags; /* Ext4 superblock flags */ 1507 unsigned long s_commit_interval; 1508 u32 s_max_batch_time; 1509 u32 s_min_batch_time; 1510 struct block_device *s_journal_bdev; 1511 #ifdef CONFIG_QUOTA 1512 /* Names of quota files with journalled quota */ 1513 char __rcu *s_qf_names[EXT4_MAXQUOTAS]; 1514 int s_jquota_fmt; /* Format of quota to use */ 1515 #endif 1516 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1517 struct ext4_system_blocks __rcu *s_system_blks; 1518 1519 #ifdef EXTENTS_STATS 1520 /* ext4 extents stats */ 1521 unsigned long s_ext_min; 1522 unsigned long s_ext_max; 1523 unsigned long s_depth_max; 1524 spinlock_t s_ext_stats_lock; 1525 unsigned long s_ext_blocks; 1526 unsigned long s_ext_extents; 1527 #endif 1528 1529 /* for buddy allocator */ 1530 struct ext4_group_info ** __rcu *s_group_info; 1531 struct inode *s_buddy_cache; 1532 spinlock_t s_md_lock; 1533 unsigned short *s_mb_offsets; 1534 unsigned int *s_mb_maxs; 1535 unsigned int s_group_info_size; 1536 unsigned int s_mb_free_pending; 1537 struct list_head s_freed_data_list; /* List of blocks to be freed 1538 after commit completed */ 1539 struct rb_root s_mb_avg_fragment_size_root; 1540 rwlock_t s_mb_rb_lock; 1541 struct list_head *s_mb_largest_free_orders; 1542 rwlock_t *s_mb_largest_free_orders_locks; 1543 1544 /* tunables */ 1545 unsigned long s_stripe; 1546 unsigned int s_mb_max_linear_groups; 1547 unsigned int s_mb_stream_request; 1548 unsigned int s_mb_max_to_scan; 1549 unsigned int s_mb_min_to_scan; 1550 unsigned int s_mb_stats; 1551 unsigned int s_mb_order2_reqs; 1552 unsigned int s_mb_group_prealloc; 1553 unsigned int s_mb_max_inode_prealloc; 1554 unsigned int s_max_dir_size_kb; 1555 /* where last allocation was done - for stream allocation */ 1556 unsigned long s_mb_last_group; 1557 unsigned long s_mb_last_start; 1558 unsigned int s_mb_prefetch; 1559 unsigned int s_mb_prefetch_limit; 1560 1561 /* stats for buddy allocator */ 1562 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1563 atomic_t s_bal_success; /* we found long enough chunks */ 1564 atomic_t s_bal_allocated; /* in blocks */ 1565 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1566 atomic_t s_bal_groups_scanned; /* number of groups scanned */ 1567 atomic_t s_bal_goals; /* goal hits */ 1568 atomic_t s_bal_breaks; /* too long searches */ 1569 atomic_t s_bal_2orders; /* 2^order hits */ 1570 atomic_t s_bal_cr0_bad_suggestions; 1571 atomic_t s_bal_cr1_bad_suggestions; 1572 atomic64_t s_bal_cX_groups_considered[4]; 1573 atomic64_t s_bal_cX_hits[4]; 1574 atomic64_t s_bal_cX_failed[4]; /* cX loop didn't find blocks */ 1575 atomic_t s_mb_buddies_generated; /* number of buddies generated */ 1576 atomic64_t s_mb_generation_time; 1577 atomic_t s_mb_lost_chunks; 1578 atomic_t s_mb_preallocated; 1579 atomic_t s_mb_discarded; 1580 atomic_t s_lock_busy; 1581 1582 /* locality groups */ 1583 struct ext4_locality_group __percpu *s_locality_groups; 1584 1585 /* for write statistics */ 1586 unsigned long s_sectors_written_start; 1587 u64 s_kbytes_written; 1588 1589 /* the size of zero-out chunk */ 1590 unsigned int s_extent_max_zeroout_kb; 1591 1592 unsigned int s_log_groups_per_flex; 1593 struct flex_groups * __rcu *s_flex_groups; 1594 ext4_group_t s_flex_groups_allocated; 1595 1596 /* workqueue for reserved extent conversions (buffered io) */ 1597 struct workqueue_struct *rsv_conversion_wq; 1598 1599 /* timer for periodic error stats printing */ 1600 struct timer_list s_err_report; 1601 1602 /* Lazy inode table initialization info */ 1603 struct ext4_li_request *s_li_request; 1604 /* Wait multiplier for lazy initialization thread */ 1605 unsigned int s_li_wait_mult; 1606 1607 /* Kernel thread for multiple mount protection */ 1608 struct task_struct *s_mmp_tsk; 1609 1610 /* record the last minlen when FITRIM is called. */ 1611 atomic_t s_last_trim_minblks; 1612 1613 /* Reference to checksum algorithm driver via cryptoapi */ 1614 struct crypto_shash *s_chksum_driver; 1615 1616 /* Precomputed FS UUID checksum for seeding other checksums */ 1617 __u32 s_csum_seed; 1618 1619 /* Reclaim extents from extent status tree */ 1620 struct shrinker s_es_shrinker; 1621 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1622 long s_es_nr_inode; 1623 struct ext4_es_stats s_es_stats; 1624 struct mb_cache *s_ea_block_cache; 1625 struct mb_cache *s_ea_inode_cache; 1626 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1627 1628 /* Ratelimit ext4 messages. */ 1629 struct ratelimit_state s_err_ratelimit_state; 1630 struct ratelimit_state s_warning_ratelimit_state; 1631 struct ratelimit_state s_msg_ratelimit_state; 1632 atomic_t s_warning_count; 1633 atomic_t s_msg_count; 1634 1635 /* Encryption policy for '-o test_dummy_encryption' */ 1636 struct fscrypt_dummy_policy s_dummy_enc_policy; 1637 1638 /* 1639 * Barrier between writepages ops and changing any inode's JOURNAL_DATA 1640 * or EXTENTS flag. 1641 */ 1642 struct percpu_rw_semaphore s_writepages_rwsem; 1643 struct dax_device *s_daxdev; 1644 #ifdef CONFIG_EXT4_DEBUG 1645 unsigned long s_simulate_fail; 1646 #endif 1647 /* Record the errseq of the backing block device */ 1648 errseq_t s_bdev_wb_err; 1649 spinlock_t s_bdev_wb_lock; 1650 1651 /* Information about errors that happened during this mount */ 1652 spinlock_t s_error_lock; 1653 int s_add_error_count; 1654 int s_first_error_code; 1655 __u32 s_first_error_line; 1656 __u32 s_first_error_ino; 1657 __u64 s_first_error_block; 1658 const char *s_first_error_func; 1659 time64_t s_first_error_time; 1660 int s_last_error_code; 1661 __u32 s_last_error_line; 1662 __u32 s_last_error_ino; 1663 __u64 s_last_error_block; 1664 const char *s_last_error_func; 1665 time64_t s_last_error_time; 1666 /* 1667 * If we are in a context where we cannot update error information in 1668 * the on-disk superblock, we queue this work to do it. 1669 */ 1670 struct work_struct s_error_work; 1671 1672 /* Ext4 fast commit stuff */ 1673 atomic_t s_fc_subtid; 1674 atomic_t s_fc_ineligible_updates; 1675 /* 1676 * After commit starts, the main queue gets locked, and the further 1677 * updates get added in the staging queue. 1678 */ 1679 #define FC_Q_MAIN 0 1680 #define FC_Q_STAGING 1 1681 struct list_head s_fc_q[2]; /* Inodes staged for fast commit 1682 * that have data changes in them. 1683 */ 1684 struct list_head s_fc_dentry_q[2]; /* directory entry updates */ 1685 unsigned int s_fc_bytes; 1686 /* 1687 * Main fast commit lock. This lock protects accesses to the 1688 * following fields: 1689 * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh. 1690 */ 1691 spinlock_t s_fc_lock; 1692 struct buffer_head *s_fc_bh; 1693 struct ext4_fc_stats s_fc_stats; 1694 u64 s_fc_avg_commit_time; 1695 #ifdef CONFIG_EXT4_DEBUG 1696 int s_fc_debug_max_replay; 1697 #endif 1698 struct ext4_fc_replay_state s_fc_replay_state; 1699 }; 1700 1701 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1702 { 1703 return sb->s_fs_info; 1704 } 1705 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1706 { 1707 return container_of(inode, struct ext4_inode_info, vfs_inode); 1708 } 1709 1710 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1711 { 1712 return ino == EXT4_ROOT_INO || 1713 (ino >= EXT4_FIRST_INO(sb) && 1714 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1715 } 1716 1717 /* 1718 * Returns: sbi->field[index] 1719 * Used to access an array element from the following sbi fields which require 1720 * rcu protection to avoid dereferencing an invalid pointer due to reassignment 1721 * - s_group_desc 1722 * - s_group_info 1723 * - s_flex_group 1724 */ 1725 #define sbi_array_rcu_deref(sbi, field, index) \ 1726 ({ \ 1727 typeof(*((sbi)->field)) _v; \ 1728 rcu_read_lock(); \ 1729 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \ 1730 rcu_read_unlock(); \ 1731 _v; \ 1732 }) 1733 1734 /* 1735 * run-time mount flags 1736 */ 1737 enum { 1738 EXT4_MF_MNTDIR_SAMPLED, 1739 EXT4_MF_FS_ABORTED, /* Fatal error detected */ 1740 EXT4_MF_FC_INELIGIBLE, /* Fast commit ineligible */ 1741 EXT4_MF_FC_COMMITTING /* File system underoing a fast 1742 * commit. 1743 */ 1744 }; 1745 1746 static inline void ext4_set_mount_flag(struct super_block *sb, int bit) 1747 { 1748 set_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1749 } 1750 1751 static inline void ext4_clear_mount_flag(struct super_block *sb, int bit) 1752 { 1753 clear_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1754 } 1755 1756 static inline int ext4_test_mount_flag(struct super_block *sb, int bit) 1757 { 1758 return test_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1759 } 1760 1761 1762 /* 1763 * Simulate_fail codes 1764 */ 1765 #define EXT4_SIM_BBITMAP_EIO 1 1766 #define EXT4_SIM_BBITMAP_CRC 2 1767 #define EXT4_SIM_IBITMAP_EIO 3 1768 #define EXT4_SIM_IBITMAP_CRC 4 1769 #define EXT4_SIM_INODE_EIO 5 1770 #define EXT4_SIM_INODE_CRC 6 1771 #define EXT4_SIM_DIRBLOCK_EIO 7 1772 #define EXT4_SIM_DIRBLOCK_CRC 8 1773 1774 static inline bool ext4_simulate_fail(struct super_block *sb, 1775 unsigned long code) 1776 { 1777 #ifdef CONFIG_EXT4_DEBUG 1778 struct ext4_sb_info *sbi = EXT4_SB(sb); 1779 1780 if (unlikely(sbi->s_simulate_fail == code)) { 1781 sbi->s_simulate_fail = 0; 1782 return true; 1783 } 1784 #endif 1785 return false; 1786 } 1787 1788 static inline void ext4_simulate_fail_bh(struct super_block *sb, 1789 struct buffer_head *bh, 1790 unsigned long code) 1791 { 1792 if (!IS_ERR(bh) && ext4_simulate_fail(sb, code)) 1793 clear_buffer_uptodate(bh); 1794 } 1795 1796 /* 1797 * Error number codes for s_{first,last}_error_errno 1798 * 1799 * Linux errno numbers are architecture specific, so we need to translate 1800 * them into something which is architecture independent. We don't define 1801 * codes for all errno's; just the ones which are most likely to be the cause 1802 * of an ext4_error() call. 1803 */ 1804 #define EXT4_ERR_UNKNOWN 1 1805 #define EXT4_ERR_EIO 2 1806 #define EXT4_ERR_ENOMEM 3 1807 #define EXT4_ERR_EFSBADCRC 4 1808 #define EXT4_ERR_EFSCORRUPTED 5 1809 #define EXT4_ERR_ENOSPC 6 1810 #define EXT4_ERR_ENOKEY 7 1811 #define EXT4_ERR_EROFS 8 1812 #define EXT4_ERR_EFBIG 9 1813 #define EXT4_ERR_EEXIST 10 1814 #define EXT4_ERR_ERANGE 11 1815 #define EXT4_ERR_EOVERFLOW 12 1816 #define EXT4_ERR_EBUSY 13 1817 #define EXT4_ERR_ENOTDIR 14 1818 #define EXT4_ERR_ENOTEMPTY 15 1819 #define EXT4_ERR_ESHUTDOWN 16 1820 #define EXT4_ERR_EFAULT 17 1821 1822 /* 1823 * Inode dynamic state flags 1824 */ 1825 enum { 1826 EXT4_STATE_JDATA, /* journaled data exists */ 1827 EXT4_STATE_NEW, /* inode is newly created */ 1828 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1829 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1830 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1831 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1832 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1833 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1834 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1835 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */ 1836 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */ 1837 EXT4_STATE_FC_COMMITTING, /* Fast commit ongoing */ 1838 }; 1839 1840 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1841 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1842 { \ 1843 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1844 } \ 1845 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1846 { \ 1847 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1848 } \ 1849 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1850 { \ 1851 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1852 } 1853 1854 /* Add these declarations here only so that these functions can be 1855 * found by name. Otherwise, they are very hard to locate. */ 1856 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1857 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1858 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1859 EXT4_INODE_BIT_FNS(flag, flags, 0) 1860 1861 /* Add these declarations here only so that these functions can be 1862 * found by name. Otherwise, they are very hard to locate. */ 1863 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1864 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1865 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1866 #if (BITS_PER_LONG < 64) 1867 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1868 1869 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1870 { 1871 (ei)->i_state_flags = 0; 1872 } 1873 #else 1874 EXT4_INODE_BIT_FNS(state, flags, 32) 1875 1876 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1877 { 1878 /* We depend on the fact that callers will set i_flags */ 1879 } 1880 #endif 1881 #else 1882 /* Assume that user mode programs are passing in an ext4fs superblock, not 1883 * a kernel struct super_block. This will allow us to call the feature-test 1884 * macros from user land. */ 1885 #define EXT4_SB(sb) (sb) 1886 #endif 1887 1888 static inline bool ext4_verity_in_progress(struct inode *inode) 1889 { 1890 return IS_ENABLED(CONFIG_FS_VERITY) && 1891 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS); 1892 } 1893 1894 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1895 1896 /* 1897 * Codes for operating systems 1898 */ 1899 #define EXT4_OS_LINUX 0 1900 #define EXT4_OS_HURD 1 1901 #define EXT4_OS_MASIX 2 1902 #define EXT4_OS_FREEBSD 3 1903 #define EXT4_OS_LITES 4 1904 1905 /* 1906 * Revision levels 1907 */ 1908 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1909 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1910 1911 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1912 1913 #define EXT4_GOOD_OLD_INODE_SIZE 128 1914 1915 #define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN) 1916 #define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX 1917 #define EXT4_TIMESTAMP_MIN S32_MIN 1918 1919 /* 1920 * Feature set definitions 1921 */ 1922 1923 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1924 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1925 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1926 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1927 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1928 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1929 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1930 /* 1931 * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes 1932 * incompatible only if fast commit blocks are present in the FS. Since we 1933 * clear the journal (and thus the fast commit blocks), we don't mark FS as 1934 * incompatible. We also have a JBD2 incompat feature, which gets set when 1935 * there are fast commit blocks present in the journal. 1936 */ 1937 #define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400 1938 #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800 1939 1940 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1941 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1942 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1943 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1944 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1945 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1946 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1947 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1948 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1949 /* 1950 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1951 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1952 * all other data structures' checksums. However, the METADATA_CSUM and 1953 * GDT_CSUM bits are mutually exclusive. 1954 */ 1955 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1956 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1957 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 1958 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000 1959 1960 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1961 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1962 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1963 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1964 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1965 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1966 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1967 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1968 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1969 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1970 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1971 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 1972 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1973 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1974 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1975 #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000 1976 1977 extern void ext4_update_dynamic_rev(struct super_block *sb); 1978 1979 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 1980 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1981 { \ 1982 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1983 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 1984 } \ 1985 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1986 { \ 1987 ext4_update_dynamic_rev(sb); \ 1988 EXT4_SB(sb)->s_es->s_feature_compat |= \ 1989 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1990 } \ 1991 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1992 { \ 1993 EXT4_SB(sb)->s_es->s_feature_compat &= \ 1994 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1995 } 1996 1997 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 1998 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1999 { \ 2000 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 2001 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 2002 } \ 2003 static inline void ext4_set_feature_##name(struct super_block *sb) \ 2004 { \ 2005 ext4_update_dynamic_rev(sb); \ 2006 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 2007 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 2008 } \ 2009 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 2010 { \ 2011 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 2012 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 2013 } 2014 2015 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 2016 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 2017 { \ 2018 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 2019 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 2020 } \ 2021 static inline void ext4_set_feature_##name(struct super_block *sb) \ 2022 { \ 2023 ext4_update_dynamic_rev(sb); \ 2024 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 2025 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 2026 } \ 2027 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 2028 { \ 2029 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 2030 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 2031 } 2032 2033 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 2034 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 2035 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 2036 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 2037 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 2038 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 2039 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 2040 EXT4_FEATURE_COMPAT_FUNCS(fast_commit, FAST_COMMIT) 2041 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES) 2042 2043 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 2044 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 2045 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 2046 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 2047 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 2048 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 2049 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 2050 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 2051 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 2052 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 2053 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 2054 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 2055 EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY) 2056 2057 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 2058 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 2059 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 2060 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 2061 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 2062 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 2063 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 2064 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 2065 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 2066 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 2067 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 2068 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 2069 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 2070 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 2071 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 2072 EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD) 2073 2074 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2075 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2076 EXT4_FEATURE_INCOMPAT_META_BG) 2077 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2078 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2079 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 2080 2081 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2082 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2083 EXT4_FEATURE_INCOMPAT_RECOVER| \ 2084 EXT4_FEATURE_INCOMPAT_META_BG) 2085 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2086 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2087 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 2088 2089 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2090 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2091 EXT4_FEATURE_INCOMPAT_RECOVER| \ 2092 EXT4_FEATURE_INCOMPAT_META_BG| \ 2093 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 2094 EXT4_FEATURE_INCOMPAT_64BIT| \ 2095 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 2096 EXT4_FEATURE_INCOMPAT_EA_INODE| \ 2097 EXT4_FEATURE_INCOMPAT_MMP | \ 2098 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 2099 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 2100 EXT4_FEATURE_INCOMPAT_CASEFOLD | \ 2101 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \ 2102 EXT4_FEATURE_INCOMPAT_LARGEDIR) 2103 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2104 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2105 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 2106 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 2107 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 2108 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 2109 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 2110 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 2111 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 2112 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 2113 EXT4_FEATURE_RO_COMPAT_PROJECT |\ 2114 EXT4_FEATURE_RO_COMPAT_VERITY) 2115 2116 #define EXTN_FEATURE_FUNCS(ver) \ 2117 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 2118 { \ 2119 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 2120 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 2121 } \ 2122 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 2123 { \ 2124 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 2125 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 2126 } \ 2127 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 2128 { \ 2129 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 2130 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 2131 } 2132 2133 EXTN_FEATURE_FUNCS(2) 2134 EXTN_FEATURE_FUNCS(3) 2135 EXTN_FEATURE_FUNCS(4) 2136 2137 static inline bool ext4_has_compat_features(struct super_block *sb) 2138 { 2139 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 2140 } 2141 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 2142 { 2143 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 2144 } 2145 static inline bool ext4_has_incompat_features(struct super_block *sb) 2146 { 2147 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 2148 } 2149 2150 /* 2151 * Superblock flags 2152 */ 2153 #define EXT4_FLAGS_RESIZING 0 2154 #define EXT4_FLAGS_SHUTDOWN 1 2155 #define EXT4_FLAGS_BDEV_IS_DAX 2 2156 2157 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi) 2158 { 2159 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 2160 } 2161 2162 2163 /* 2164 * Default values for user and/or group using reserved blocks 2165 */ 2166 #define EXT4_DEF_RESUID 0 2167 #define EXT4_DEF_RESGID 0 2168 2169 /* 2170 * Default project ID 2171 */ 2172 #define EXT4_DEF_PROJID 0 2173 2174 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 2175 2176 /* 2177 * Default mount options 2178 */ 2179 #define EXT4_DEFM_DEBUG 0x0001 2180 #define EXT4_DEFM_BSDGROUPS 0x0002 2181 #define EXT4_DEFM_XATTR_USER 0x0004 2182 #define EXT4_DEFM_ACL 0x0008 2183 #define EXT4_DEFM_UID16 0x0010 2184 #define EXT4_DEFM_JMODE 0x0060 2185 #define EXT4_DEFM_JMODE_DATA 0x0020 2186 #define EXT4_DEFM_JMODE_ORDERED 0x0040 2187 #define EXT4_DEFM_JMODE_WBACK 0x0060 2188 #define EXT4_DEFM_NOBARRIER 0x0100 2189 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 2190 #define EXT4_DEFM_DISCARD 0x0400 2191 #define EXT4_DEFM_NODELALLOC 0x0800 2192 2193 /* 2194 * Default journal batch times 2195 */ 2196 #define EXT4_DEF_MIN_BATCH_TIME 0 2197 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 2198 2199 /* 2200 * Minimum number of groups in a flexgroup before we separate out 2201 * directories into the first block group of a flexgroup 2202 */ 2203 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 2204 2205 /* 2206 * Structure of a directory entry 2207 */ 2208 #define EXT4_NAME_LEN 255 2209 2210 struct ext4_dir_entry { 2211 __le32 inode; /* Inode number */ 2212 __le16 rec_len; /* Directory entry length */ 2213 __le16 name_len; /* Name length */ 2214 char name[EXT4_NAME_LEN]; /* File name */ 2215 }; 2216 2217 2218 /* 2219 * Encrypted Casefolded entries require saving the hash on disk. This structure 2220 * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned 2221 * boundary. 2222 */ 2223 struct ext4_dir_entry_hash { 2224 __le32 hash; 2225 __le32 minor_hash; 2226 }; 2227 2228 /* 2229 * The new version of the directory entry. Since EXT4 structures are 2230 * stored in intel byte order, and the name_len field could never be 2231 * bigger than 255 chars, it's safe to reclaim the extra byte for the 2232 * file_type field. 2233 */ 2234 struct ext4_dir_entry_2 { 2235 __le32 inode; /* Inode number */ 2236 __le16 rec_len; /* Directory entry length */ 2237 __u8 name_len; /* Name length */ 2238 __u8 file_type; /* See file type macros EXT4_FT_* below */ 2239 char name[EXT4_NAME_LEN]; /* File name */ 2240 }; 2241 2242 /* 2243 * Access the hashes at the end of ext4_dir_entry_2 2244 */ 2245 #define EXT4_DIRENT_HASHES(entry) \ 2246 ((struct ext4_dir_entry_hash *) \ 2247 (((void *)(entry)) + \ 2248 ((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND))) 2249 #define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(de)->hash) 2250 #define EXT4_DIRENT_MINOR_HASH(entry) \ 2251 le32_to_cpu(EXT4_DIRENT_HASHES(de)->minor_hash) 2252 2253 static inline bool ext4_hash_in_dirent(const struct inode *inode) 2254 { 2255 return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode); 2256 } 2257 2258 /* 2259 * This is a bogus directory entry at the end of each leaf block that 2260 * records checksums. 2261 */ 2262 struct ext4_dir_entry_tail { 2263 __le32 det_reserved_zero1; /* Pretend to be unused */ 2264 __le16 det_rec_len; /* 12 */ 2265 __u8 det_reserved_zero2; /* Zero name length */ 2266 __u8 det_reserved_ft; /* 0xDE, fake file type */ 2267 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 2268 }; 2269 2270 #define EXT4_DIRENT_TAIL(block, blocksize) \ 2271 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 2272 ((blocksize) - \ 2273 sizeof(struct ext4_dir_entry_tail)))) 2274 2275 /* 2276 * Ext4 directory file types. Only the low 3 bits are used. The 2277 * other bits are reserved for now. 2278 */ 2279 #define EXT4_FT_UNKNOWN 0 2280 #define EXT4_FT_REG_FILE 1 2281 #define EXT4_FT_DIR 2 2282 #define EXT4_FT_CHRDEV 3 2283 #define EXT4_FT_BLKDEV 4 2284 #define EXT4_FT_FIFO 5 2285 #define EXT4_FT_SOCK 6 2286 #define EXT4_FT_SYMLINK 7 2287 2288 #define EXT4_FT_MAX 8 2289 2290 #define EXT4_FT_DIR_CSUM 0xDE 2291 2292 /* 2293 * EXT4_DIR_PAD defines the directory entries boundaries 2294 * 2295 * NOTE: It must be a multiple of 4 2296 */ 2297 #define EXT4_DIR_PAD 4 2298 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 2299 #define EXT4_MAX_REC_LEN ((1<<16)-1) 2300 2301 /* 2302 * The rec_len is dependent on the type of directory. Directories that are 2303 * casefolded and encrypted need to store the hash as well, so we add room for 2304 * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should 2305 * pass NULL for dir, as those entries do not use the extra fields. 2306 */ 2307 static inline unsigned int ext4_dir_rec_len(__u8 name_len, 2308 const struct inode *dir) 2309 { 2310 int rec_len = (name_len + 8 + EXT4_DIR_ROUND); 2311 2312 if (dir && ext4_hash_in_dirent(dir)) 2313 rec_len += sizeof(struct ext4_dir_entry_hash); 2314 return (rec_len & ~EXT4_DIR_ROUND); 2315 } 2316 2317 /* 2318 * If we ever get support for fs block sizes > page_size, we'll need 2319 * to remove the #if statements in the next two functions... 2320 */ 2321 static inline unsigned int 2322 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 2323 { 2324 unsigned len = le16_to_cpu(dlen); 2325 2326 #if (PAGE_SIZE >= 65536) 2327 if (len == EXT4_MAX_REC_LEN || len == 0) 2328 return blocksize; 2329 return (len & 65532) | ((len & 3) << 16); 2330 #else 2331 return len; 2332 #endif 2333 } 2334 2335 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 2336 { 2337 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 2338 BUG(); 2339 #if (PAGE_SIZE >= 65536) 2340 if (len < 65536) 2341 return cpu_to_le16(len); 2342 if (len == blocksize) { 2343 if (blocksize == 65536) 2344 return cpu_to_le16(EXT4_MAX_REC_LEN); 2345 else 2346 return cpu_to_le16(0); 2347 } 2348 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 2349 #else 2350 return cpu_to_le16(len); 2351 #endif 2352 } 2353 2354 /* 2355 * Hash Tree Directory indexing 2356 * (c) Daniel Phillips, 2001 2357 */ 2358 2359 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2360 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2361 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \ 2362 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir))) 2363 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2364 2365 /* Legal values for the dx_root hash_version field: */ 2366 2367 #define DX_HASH_LEGACY 0 2368 #define DX_HASH_HALF_MD4 1 2369 #define DX_HASH_TEA 2 2370 #define DX_HASH_LEGACY_UNSIGNED 3 2371 #define DX_HASH_HALF_MD4_UNSIGNED 4 2372 #define DX_HASH_TEA_UNSIGNED 5 2373 #define DX_HASH_SIPHASH 6 2374 2375 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 2376 const void *address, unsigned int length) 2377 { 2378 struct { 2379 struct shash_desc shash; 2380 char ctx[4]; 2381 } desc; 2382 2383 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2384 2385 desc.shash.tfm = sbi->s_chksum_driver; 2386 *(u32 *)desc.ctx = crc; 2387 2388 BUG_ON(crypto_shash_update(&desc.shash, address, length)); 2389 2390 return *(u32 *)desc.ctx; 2391 } 2392 2393 #ifdef __KERNEL__ 2394 2395 /* hash info structure used by the directory hash */ 2396 struct dx_hash_info 2397 { 2398 u32 hash; 2399 u32 minor_hash; 2400 int hash_version; 2401 u32 *seed; 2402 }; 2403 2404 2405 /* 32 and 64 bit signed EOF for dx directories */ 2406 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2407 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2408 2409 2410 /* 2411 * Control parameters used by ext4_htree_next_block 2412 */ 2413 #define HASH_NB_ALWAYS 1 2414 2415 struct ext4_filename { 2416 const struct qstr *usr_fname; 2417 struct fscrypt_str disk_name; 2418 struct dx_hash_info hinfo; 2419 #ifdef CONFIG_FS_ENCRYPTION 2420 struct fscrypt_str crypto_buf; 2421 #endif 2422 #ifdef CONFIG_UNICODE 2423 struct fscrypt_str cf_name; 2424 #endif 2425 }; 2426 2427 #define fname_name(p) ((p)->disk_name.name) 2428 #define fname_usr_name(p) ((p)->usr_fname->name) 2429 #define fname_len(p) ((p)->disk_name.len) 2430 2431 /* 2432 * Describe an inode's exact location on disk and in memory 2433 */ 2434 struct ext4_iloc 2435 { 2436 struct buffer_head *bh; 2437 unsigned long offset; 2438 ext4_group_t block_group; 2439 }; 2440 2441 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2442 { 2443 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2444 } 2445 2446 static inline bool ext4_is_quota_file(struct inode *inode) 2447 { 2448 return IS_NOQUOTA(inode) && 2449 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL); 2450 } 2451 2452 /* 2453 * This structure is stuffed into the struct file's private_data field 2454 * for directories. It is where we put information so that we can do 2455 * readdir operations in hash tree order. 2456 */ 2457 struct dir_private_info { 2458 struct rb_root root; 2459 struct rb_node *curr_node; 2460 struct fname *extra_fname; 2461 loff_t last_pos; 2462 __u32 curr_hash; 2463 __u32 curr_minor_hash; 2464 __u32 next_hash; 2465 }; 2466 2467 /* calculate the first block number of the group */ 2468 static inline ext4_fsblk_t 2469 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2470 { 2471 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2472 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2473 } 2474 2475 /* 2476 * Special error return code only used by dx_probe() and its callers. 2477 */ 2478 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2479 2480 /* htree levels for ext4 */ 2481 #define EXT4_HTREE_LEVEL_COMPAT 2 2482 #define EXT4_HTREE_LEVEL 3 2483 2484 static inline int ext4_dir_htree_level(struct super_block *sb) 2485 { 2486 return ext4_has_feature_largedir(sb) ? 2487 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT; 2488 } 2489 2490 /* 2491 * Timeout and state flag for lazy initialization inode thread. 2492 */ 2493 #define EXT4_DEF_LI_WAIT_MULT 10 2494 #define EXT4_DEF_LI_MAX_START_DELAY 5 2495 #define EXT4_LAZYINIT_QUIT 0x0001 2496 #define EXT4_LAZYINIT_RUNNING 0x0002 2497 2498 /* 2499 * Lazy inode table initialization info 2500 */ 2501 struct ext4_lazy_init { 2502 unsigned long li_state; 2503 struct list_head li_request_list; 2504 struct mutex li_list_mtx; 2505 }; 2506 2507 enum ext4_li_mode { 2508 EXT4_LI_MODE_PREFETCH_BBITMAP, 2509 EXT4_LI_MODE_ITABLE, 2510 }; 2511 2512 struct ext4_li_request { 2513 struct super_block *lr_super; 2514 enum ext4_li_mode lr_mode; 2515 ext4_group_t lr_first_not_zeroed; 2516 ext4_group_t lr_next_group; 2517 struct list_head lr_request; 2518 unsigned long lr_next_sched; 2519 unsigned long lr_timeout; 2520 }; 2521 2522 struct ext4_features { 2523 struct kobject f_kobj; 2524 struct completion f_kobj_unregister; 2525 }; 2526 2527 /* 2528 * This structure will be used for multiple mount protection. It will be 2529 * written into the block number saved in the s_mmp_block field in the 2530 * superblock. Programs that check MMP should assume that if 2531 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2532 * to use the filesystem, regardless of how old the timestamp is. 2533 */ 2534 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2535 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2536 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2537 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2538 2539 struct mmp_struct { 2540 __le32 mmp_magic; /* Magic number for MMP */ 2541 __le32 mmp_seq; /* Sequence no. updated periodically */ 2542 2543 /* 2544 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2545 * purposes and do not affect the correctness of the algorithm 2546 */ 2547 __le64 mmp_time; /* Time last updated */ 2548 char mmp_nodename[64]; /* Node which last updated MMP block */ 2549 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2550 2551 /* 2552 * mmp_check_interval is used to verify if the MMP block has been 2553 * updated on the block device. The value is updated based on the 2554 * maximum time to write the MMP block during an update cycle. 2555 */ 2556 __le16 mmp_check_interval; 2557 2558 __le16 mmp_pad1; 2559 __le32 mmp_pad2[226]; 2560 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2561 }; 2562 2563 /* arguments passed to the mmp thread */ 2564 struct mmpd_data { 2565 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2566 struct super_block *sb; /* super block of the fs */ 2567 }; 2568 2569 /* 2570 * Check interval multiplier 2571 * The MMP block is written every update interval and initially checked every 2572 * update interval x the multiplier (the value is then adapted based on the 2573 * write latency). The reason is that writes can be delayed under load and we 2574 * don't want readers to incorrectly assume that the filesystem is no longer 2575 * in use. 2576 */ 2577 #define EXT4_MMP_CHECK_MULT 2UL 2578 2579 /* 2580 * Minimum interval for MMP checking in seconds. 2581 */ 2582 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2583 2584 /* 2585 * Maximum interval for MMP checking in seconds. 2586 */ 2587 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2588 2589 /* 2590 * Function prototypes 2591 */ 2592 2593 /* 2594 * Ok, these declarations are also in <linux/kernel.h> but none of the 2595 * ext4 source programs needs to include it so they are duplicated here. 2596 */ 2597 # define NORET_TYPE /**/ 2598 # define ATTRIB_NORET __attribute__((noreturn)) 2599 # define NORET_AND noreturn, 2600 2601 /* bitmap.c */ 2602 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2603 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2604 struct ext4_group_desc *gdp, 2605 struct buffer_head *bh, int sz); 2606 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2607 struct ext4_group_desc *gdp, 2608 struct buffer_head *bh, int sz); 2609 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2610 struct ext4_group_desc *gdp, 2611 struct buffer_head *bh); 2612 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2613 struct ext4_group_desc *gdp, 2614 struct buffer_head *bh); 2615 2616 /* balloc.c */ 2617 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2618 ext4_fsblk_t blocknr, 2619 ext4_group_t *blockgrpp, 2620 ext4_grpblk_t *offsetp); 2621 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2622 ext4_fsblk_t block); 2623 2624 extern unsigned int ext4_block_group(struct super_block *sb, 2625 ext4_fsblk_t blocknr); 2626 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2627 ext4_fsblk_t blocknr); 2628 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2629 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2630 ext4_group_t group); 2631 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2632 ext4_fsblk_t goal, 2633 unsigned int flags, 2634 unsigned long *count, 2635 int *errp); 2636 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2637 s64 nclusters, unsigned int flags); 2638 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2639 extern void ext4_check_blocks_bitmap(struct super_block *); 2640 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2641 ext4_group_t block_group, 2642 struct buffer_head ** bh); 2643 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2644 2645 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2646 ext4_group_t block_group, 2647 bool ignore_locked); 2648 extern int ext4_wait_block_bitmap(struct super_block *sb, 2649 ext4_group_t block_group, 2650 struct buffer_head *bh); 2651 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2652 ext4_group_t block_group); 2653 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2654 ext4_group_t block_group, 2655 struct ext4_group_desc *gdp); 2656 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2657 2658 #ifdef CONFIG_UNICODE 2659 extern int ext4_fname_setup_ci_filename(struct inode *dir, 2660 const struct qstr *iname, 2661 struct ext4_filename *fname); 2662 #endif 2663 2664 #ifdef CONFIG_FS_ENCRYPTION 2665 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst, 2666 const struct fscrypt_name *src) 2667 { 2668 memset(dst, 0, sizeof(*dst)); 2669 2670 dst->usr_fname = src->usr_fname; 2671 dst->disk_name = src->disk_name; 2672 dst->hinfo.hash = src->hash; 2673 dst->hinfo.minor_hash = src->minor_hash; 2674 dst->crypto_buf = src->crypto_buf; 2675 } 2676 2677 static inline int ext4_fname_setup_filename(struct inode *dir, 2678 const struct qstr *iname, 2679 int lookup, 2680 struct ext4_filename *fname) 2681 { 2682 struct fscrypt_name name; 2683 int err; 2684 2685 err = fscrypt_setup_filename(dir, iname, lookup, &name); 2686 if (err) 2687 return err; 2688 2689 ext4_fname_from_fscrypt_name(fname, &name); 2690 2691 #ifdef CONFIG_UNICODE 2692 err = ext4_fname_setup_ci_filename(dir, iname, fname); 2693 #endif 2694 return err; 2695 } 2696 2697 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2698 struct dentry *dentry, 2699 struct ext4_filename *fname) 2700 { 2701 struct fscrypt_name name; 2702 int err; 2703 2704 err = fscrypt_prepare_lookup(dir, dentry, &name); 2705 if (err) 2706 return err; 2707 2708 ext4_fname_from_fscrypt_name(fname, &name); 2709 2710 #ifdef CONFIG_UNICODE 2711 err = ext4_fname_setup_ci_filename(dir, &dentry->d_name, fname); 2712 #endif 2713 return err; 2714 } 2715 2716 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2717 { 2718 struct fscrypt_name name; 2719 2720 name.crypto_buf = fname->crypto_buf; 2721 fscrypt_free_filename(&name); 2722 2723 fname->crypto_buf.name = NULL; 2724 fname->usr_fname = NULL; 2725 fname->disk_name.name = NULL; 2726 2727 #ifdef CONFIG_UNICODE 2728 kfree(fname->cf_name.name); 2729 fname->cf_name.name = NULL; 2730 #endif 2731 } 2732 #else /* !CONFIG_FS_ENCRYPTION */ 2733 static inline int ext4_fname_setup_filename(struct inode *dir, 2734 const struct qstr *iname, 2735 int lookup, 2736 struct ext4_filename *fname) 2737 { 2738 int err = 0; 2739 fname->usr_fname = iname; 2740 fname->disk_name.name = (unsigned char *) iname->name; 2741 fname->disk_name.len = iname->len; 2742 2743 #ifdef CONFIG_UNICODE 2744 err = ext4_fname_setup_ci_filename(dir, iname, fname); 2745 #endif 2746 2747 return err; 2748 } 2749 2750 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2751 struct dentry *dentry, 2752 struct ext4_filename *fname) 2753 { 2754 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname); 2755 } 2756 2757 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2758 { 2759 #ifdef CONFIG_UNICODE 2760 kfree(fname->cf_name.name); 2761 fname->cf_name.name = NULL; 2762 #endif 2763 } 2764 #endif /* !CONFIG_FS_ENCRYPTION */ 2765 2766 /* dir.c */ 2767 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2768 struct file *, 2769 struct ext4_dir_entry_2 *, 2770 struct buffer_head *, char *, int, 2771 unsigned int); 2772 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2773 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2774 (de), (bh), (buf), (size), (offset))) 2775 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2776 __u32 minor_hash, 2777 struct ext4_dir_entry_2 *dirent, 2778 struct fscrypt_str *ent_name); 2779 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2780 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2781 struct buffer_head *bh, 2782 void *buf, int buf_size, 2783 struct ext4_filename *fname, 2784 struct ext4_dir_entry_2 **dest_de); 2785 void ext4_insert_dentry(struct inode *dir, struct inode *inode, 2786 struct ext4_dir_entry_2 *de, 2787 int buf_size, 2788 struct ext4_filename *fname); 2789 static inline void ext4_update_dx_flag(struct inode *inode) 2790 { 2791 if (!ext4_has_feature_dir_index(inode->i_sb) && 2792 ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) { 2793 /* ext4_iget() should have caught this... */ 2794 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb)); 2795 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2796 } 2797 } 2798 static const unsigned char ext4_filetype_table[] = { 2799 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2800 }; 2801 2802 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2803 { 2804 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2805 return DT_UNKNOWN; 2806 2807 return ext4_filetype_table[filetype]; 2808 } 2809 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2810 void *buf, int buf_size); 2811 2812 /* fsync.c */ 2813 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2814 2815 /* hash.c */ 2816 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len, 2817 struct dx_hash_info *hinfo); 2818 2819 /* ialloc.c */ 2820 extern int ext4_mark_inode_used(struct super_block *sb, int ino); 2821 extern struct inode *__ext4_new_inode(struct user_namespace *, handle_t *, 2822 struct inode *, umode_t, 2823 const struct qstr *qstr, __u32 goal, 2824 uid_t *owner, __u32 i_flags, 2825 int handle_type, unsigned int line_no, 2826 int nblocks); 2827 2828 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \ 2829 __ext4_new_inode(&init_user_ns, (handle), (dir), (mode), (qstr), \ 2830 (goal), (owner), i_flags, 0, 0, 0) 2831 #define ext4_new_inode_start_handle(mnt_userns, dir, mode, qstr, goal, owner, \ 2832 type, nblocks) \ 2833 __ext4_new_inode((mnt_userns), NULL, (dir), (mode), (qstr), (goal), (owner), \ 2834 0, (type), __LINE__, (nblocks)) 2835 2836 2837 extern void ext4_free_inode(handle_t *, struct inode *); 2838 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2839 extern unsigned long ext4_count_free_inodes(struct super_block *); 2840 extern unsigned long ext4_count_dirs(struct super_block *); 2841 extern void ext4_check_inodes_bitmap(struct super_block *); 2842 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2843 extern int ext4_init_inode_table(struct super_block *sb, 2844 ext4_group_t group, int barrier); 2845 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2846 2847 /* fast_commit.c */ 2848 int ext4_fc_info_show(struct seq_file *seq, void *v); 2849 void ext4_fc_init(struct super_block *sb, journal_t *journal); 2850 void ext4_fc_init_inode(struct inode *inode); 2851 void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start, 2852 ext4_lblk_t end); 2853 void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode, 2854 struct dentry *dentry); 2855 void __ext4_fc_track_link(handle_t *handle, struct inode *inode, 2856 struct dentry *dentry); 2857 void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry); 2858 void ext4_fc_track_link(handle_t *handle, struct dentry *dentry); 2859 void __ext4_fc_track_create(handle_t *handle, struct inode *inode, 2860 struct dentry *dentry); 2861 void ext4_fc_track_create(handle_t *handle, struct dentry *dentry); 2862 void ext4_fc_track_inode(handle_t *handle, struct inode *inode); 2863 void ext4_fc_mark_ineligible(struct super_block *sb, int reason); 2864 void ext4_fc_start_ineligible(struct super_block *sb, int reason); 2865 void ext4_fc_stop_ineligible(struct super_block *sb); 2866 void ext4_fc_start_update(struct inode *inode); 2867 void ext4_fc_stop_update(struct inode *inode); 2868 void ext4_fc_del(struct inode *inode); 2869 bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block); 2870 void ext4_fc_replay_cleanup(struct super_block *sb); 2871 int ext4_fc_commit(journal_t *journal, tid_t commit_tid); 2872 int __init ext4_fc_init_dentry_cache(void); 2873 2874 /* mballoc.c */ 2875 extern const struct seq_operations ext4_mb_seq_groups_ops; 2876 extern const struct seq_operations ext4_mb_seq_structs_summary_ops; 2877 extern long ext4_mb_stats; 2878 extern long ext4_mb_max_to_scan; 2879 extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset); 2880 extern int ext4_mb_init(struct super_block *); 2881 extern int ext4_mb_release(struct super_block *); 2882 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2883 struct ext4_allocation_request *, int *); 2884 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2885 extern void ext4_discard_preallocations(struct inode *, unsigned int); 2886 extern int __init ext4_init_mballoc(void); 2887 extern void ext4_exit_mballoc(void); 2888 extern ext4_group_t ext4_mb_prefetch(struct super_block *sb, 2889 ext4_group_t group, 2890 unsigned int nr, int *cnt); 2891 extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group, 2892 unsigned int nr); 2893 2894 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2895 struct buffer_head *bh, ext4_fsblk_t block, 2896 unsigned long count, int flags); 2897 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2898 ext4_group_t ngroups); 2899 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2900 ext4_group_t i, struct ext4_group_desc *desc); 2901 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2902 ext4_fsblk_t block, unsigned long count); 2903 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2904 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid); 2905 extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block, 2906 int len, int state); 2907 2908 /* inode.c */ 2909 void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw, 2910 struct ext4_inode_info *ei); 2911 int ext4_inode_is_fast_symlink(struct inode *inode); 2912 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2913 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2914 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count, 2915 bool wait, struct buffer_head **bhs); 2916 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2917 struct buffer_head *bh_result, int create); 2918 int ext4_get_block(struct inode *inode, sector_t iblock, 2919 struct buffer_head *bh_result, int create); 2920 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2921 struct buffer_head *bh, int create); 2922 int ext4_walk_page_buffers(handle_t *handle, 2923 struct buffer_head *head, 2924 unsigned from, 2925 unsigned to, 2926 int *partial, 2927 int (*fn)(handle_t *handle, 2928 struct buffer_head *bh)); 2929 int do_journal_get_write_access(handle_t *handle, 2930 struct buffer_head *bh); 2931 #define FALL_BACK_TO_NONDELALLOC 1 2932 #define CONVERT_INLINE_DATA 2 2933 2934 typedef enum { 2935 EXT4_IGET_NORMAL = 0, 2936 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */ 2937 EXT4_IGET_HANDLE = 0x0002 /* Inode # is from a handle */ 2938 } ext4_iget_flags; 2939 2940 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, 2941 ext4_iget_flags flags, const char *function, 2942 unsigned int line); 2943 2944 #define ext4_iget(sb, ino, flags) \ 2945 __ext4_iget((sb), (ino), (flags), __func__, __LINE__) 2946 2947 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2948 extern int ext4_setattr(struct user_namespace *, struct dentry *, 2949 struct iattr *); 2950 extern int ext4_getattr(struct user_namespace *, const struct path *, 2951 struct kstat *, u32, unsigned int); 2952 extern void ext4_evict_inode(struct inode *); 2953 extern void ext4_clear_inode(struct inode *); 2954 extern int ext4_file_getattr(struct user_namespace *, const struct path *, 2955 struct kstat *, u32, unsigned int); 2956 extern int ext4_sync_inode(handle_t *, struct inode *); 2957 extern void ext4_dirty_inode(struct inode *, int); 2958 extern int ext4_change_inode_journal_flag(struct inode *, int); 2959 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2960 extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino, 2961 struct ext4_iloc *iloc); 2962 extern int ext4_inode_attach_jinode(struct inode *inode); 2963 extern int ext4_can_truncate(struct inode *inode); 2964 extern int ext4_truncate(struct inode *); 2965 extern int ext4_break_layouts(struct inode *); 2966 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2967 extern void ext4_set_inode_flags(struct inode *, bool init); 2968 extern int ext4_alloc_da_blocks(struct inode *inode); 2969 extern void ext4_set_aops(struct inode *inode); 2970 extern int ext4_writepage_trans_blocks(struct inode *); 2971 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2972 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2973 loff_t lstart, loff_t lend); 2974 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf); 2975 extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf); 2976 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2977 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 2978 extern void ext4_da_release_space(struct inode *inode, int to_free); 2979 extern void ext4_da_update_reserve_space(struct inode *inode, 2980 int used, int quota_claim); 2981 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 2982 ext4_fsblk_t pblk, ext4_lblk_t len); 2983 2984 /* indirect.c */ 2985 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2986 struct ext4_map_blocks *map, int flags); 2987 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2988 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2989 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2990 ext4_lblk_t start, ext4_lblk_t end); 2991 2992 /* ioctl.c */ 2993 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2994 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2995 int ext4_fileattr_set(struct user_namespace *mnt_userns, 2996 struct dentry *dentry, struct fileattr *fa); 2997 int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa); 2998 extern void ext4_reset_inode_seed(struct inode *inode); 2999 3000 /* migrate.c */ 3001 extern int ext4_ext_migrate(struct inode *); 3002 extern int ext4_ind_migrate(struct inode *inode); 3003 3004 /* namei.c */ 3005 extern int ext4_init_new_dir(handle_t *handle, struct inode *dir, 3006 struct inode *inode); 3007 extern int ext4_dirblock_csum_verify(struct inode *inode, 3008 struct buffer_head *bh); 3009 extern int ext4_orphan_add(handle_t *, struct inode *); 3010 extern int ext4_orphan_del(handle_t *, struct inode *); 3011 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 3012 __u32 start_minor_hash, __u32 *next_hash); 3013 extern int ext4_search_dir(struct buffer_head *bh, 3014 char *search_buf, 3015 int buf_size, 3016 struct inode *dir, 3017 struct ext4_filename *fname, 3018 unsigned int offset, 3019 struct ext4_dir_entry_2 **res_dir); 3020 extern int ext4_generic_delete_entry(struct inode *dir, 3021 struct ext4_dir_entry_2 *de_del, 3022 struct buffer_head *bh, 3023 void *entry_buf, 3024 int buf_size, 3025 int csum_size); 3026 extern bool ext4_empty_dir(struct inode *inode); 3027 3028 /* resize.c */ 3029 extern void ext4_kvfree_array_rcu(void *to_free); 3030 extern int ext4_group_add(struct super_block *sb, 3031 struct ext4_new_group_data *input); 3032 extern int ext4_group_extend(struct super_block *sb, 3033 struct ext4_super_block *es, 3034 ext4_fsblk_t n_blocks_count); 3035 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 3036 3037 /* super.c */ 3038 extern struct buffer_head *ext4_sb_bread(struct super_block *sb, 3039 sector_t block, int op_flags); 3040 extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb, 3041 sector_t block); 3042 extern void ext4_read_bh_nowait(struct buffer_head *bh, int op_flags, 3043 bh_end_io_t *end_io); 3044 extern int ext4_read_bh(struct buffer_head *bh, int op_flags, 3045 bh_end_io_t *end_io); 3046 extern int ext4_read_bh_lock(struct buffer_head *bh, int op_flags, bool wait); 3047 extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block); 3048 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 3049 extern int ext4_calculate_overhead(struct super_block *sb); 3050 extern void ext4_superblock_csum_set(struct super_block *sb); 3051 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 3052 ext4_group_t ngroup); 3053 extern const char *ext4_decode_error(struct super_block *sb, int errno, 3054 char nbuf[16]); 3055 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb, 3056 ext4_group_t block_group, 3057 unsigned int flags); 3058 3059 extern __printf(7, 8) 3060 void __ext4_error(struct super_block *, const char *, unsigned int, bool, 3061 int, __u64, const char *, ...); 3062 extern __printf(6, 7) 3063 void __ext4_error_inode(struct inode *, const char *, unsigned int, 3064 ext4_fsblk_t, int, const char *, ...); 3065 extern __printf(5, 6) 3066 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 3067 const char *, ...); 3068 extern void __ext4_std_error(struct super_block *, const char *, 3069 unsigned int, int); 3070 extern __printf(4, 5) 3071 void __ext4_warning(struct super_block *, const char *, unsigned int, 3072 const char *, ...); 3073 extern __printf(4, 5) 3074 void __ext4_warning_inode(const struct inode *inode, const char *function, 3075 unsigned int line, const char *fmt, ...); 3076 extern __printf(3, 4) 3077 void __ext4_msg(struct super_block *, const char *, const char *, ...); 3078 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 3079 const char *, unsigned int, const char *); 3080 extern __printf(7, 8) 3081 void __ext4_grp_locked_error(const char *, unsigned int, 3082 struct super_block *, ext4_group_t, 3083 unsigned long, ext4_fsblk_t, 3084 const char *, ...); 3085 3086 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 3087 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 3088 3089 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \ 3090 __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a) 3091 3092 #define ext4_error_inode_block(inode, block, err, fmt, a...) \ 3093 __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \ 3094 (fmt), ## a) 3095 3096 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 3097 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 3098 3099 #define ext4_abort(sb, err, fmt, a...) \ 3100 __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a) 3101 3102 #ifdef CONFIG_PRINTK 3103 3104 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 3105 __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__) 3106 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 3107 __ext4_error_inode((inode), (func), (line), (block), \ 3108 (err), (fmt), ##__VA_ARGS__) 3109 #define ext4_error_file(file, func, line, block, fmt, ...) \ 3110 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 3111 #define ext4_error(sb, fmt, ...) \ 3112 __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt), \ 3113 ##__VA_ARGS__) 3114 #define ext4_error_err(sb, err, fmt, ...) \ 3115 __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt), \ 3116 ##__VA_ARGS__) 3117 #define ext4_warning(sb, fmt, ...) \ 3118 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 3119 #define ext4_warning_inode(inode, fmt, ...) \ 3120 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 3121 #define ext4_msg(sb, level, fmt, ...) \ 3122 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 3123 #define dump_mmp_msg(sb, mmp, msg) \ 3124 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 3125 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 3126 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 3127 fmt, ##__VA_ARGS__) 3128 3129 #else 3130 3131 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 3132 do { \ 3133 no_printk(fmt, ##__VA_ARGS__); \ 3134 __ext4_error_inode(inode, "", 0, block, 0, " "); \ 3135 } while (0) 3136 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 3137 do { \ 3138 no_printk(fmt, ##__VA_ARGS__); \ 3139 __ext4_error_inode(inode, "", 0, block, err, " "); \ 3140 } while (0) 3141 #define ext4_error_file(file, func, line, block, fmt, ...) \ 3142 do { \ 3143 no_printk(fmt, ##__VA_ARGS__); \ 3144 __ext4_error_file(file, "", 0, block, " "); \ 3145 } while (0) 3146 #define ext4_error(sb, fmt, ...) \ 3147 do { \ 3148 no_printk(fmt, ##__VA_ARGS__); \ 3149 __ext4_error(sb, "", 0, false, 0, 0, " "); \ 3150 } while (0) 3151 #define ext4_error_err(sb, err, fmt, ...) \ 3152 do { \ 3153 no_printk(fmt, ##__VA_ARGS__); \ 3154 __ext4_error(sb, "", 0, false, err, 0, " "); \ 3155 } while (0) 3156 #define ext4_warning(sb, fmt, ...) \ 3157 do { \ 3158 no_printk(fmt, ##__VA_ARGS__); \ 3159 __ext4_warning(sb, "", 0, " "); \ 3160 } while (0) 3161 #define ext4_warning_inode(inode, fmt, ...) \ 3162 do { \ 3163 no_printk(fmt, ##__VA_ARGS__); \ 3164 __ext4_warning_inode(inode, "", 0, " "); \ 3165 } while (0) 3166 #define ext4_msg(sb, level, fmt, ...) \ 3167 do { \ 3168 no_printk(fmt, ##__VA_ARGS__); \ 3169 __ext4_msg(sb, "", " "); \ 3170 } while (0) 3171 #define dump_mmp_msg(sb, mmp, msg) \ 3172 __dump_mmp_msg(sb, mmp, "", 0, "") 3173 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 3174 do { \ 3175 no_printk(fmt, ##__VA_ARGS__); \ 3176 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 3177 } while (0) 3178 3179 #endif 3180 3181 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 3182 struct ext4_group_desc *bg); 3183 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 3184 struct ext4_group_desc *bg); 3185 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 3186 struct ext4_group_desc *bg); 3187 extern __u32 ext4_free_group_clusters(struct super_block *sb, 3188 struct ext4_group_desc *bg); 3189 extern __u32 ext4_free_inodes_count(struct super_block *sb, 3190 struct ext4_group_desc *bg); 3191 extern __u32 ext4_used_dirs_count(struct super_block *sb, 3192 struct ext4_group_desc *bg); 3193 extern __u32 ext4_itable_unused_count(struct super_block *sb, 3194 struct ext4_group_desc *bg); 3195 extern void ext4_block_bitmap_set(struct super_block *sb, 3196 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3197 extern void ext4_inode_bitmap_set(struct super_block *sb, 3198 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3199 extern void ext4_inode_table_set(struct super_block *sb, 3200 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3201 extern void ext4_free_group_clusters_set(struct super_block *sb, 3202 struct ext4_group_desc *bg, 3203 __u32 count); 3204 extern void ext4_free_inodes_set(struct super_block *sb, 3205 struct ext4_group_desc *bg, __u32 count); 3206 extern void ext4_used_dirs_set(struct super_block *sb, 3207 struct ext4_group_desc *bg, __u32 count); 3208 extern void ext4_itable_unused_set(struct super_block *sb, 3209 struct ext4_group_desc *bg, __u32 count); 3210 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 3211 struct ext4_group_desc *gdp); 3212 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 3213 struct ext4_group_desc *gdp); 3214 extern int ext4_register_li_request(struct super_block *sb, 3215 ext4_group_t first_not_zeroed); 3216 3217 static inline int ext4_has_metadata_csum(struct super_block *sb) 3218 { 3219 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 3220 !EXT4_SB(sb)->s_chksum_driver); 3221 3222 return ext4_has_feature_metadata_csum(sb) && 3223 (EXT4_SB(sb)->s_chksum_driver != NULL); 3224 } 3225 3226 static inline int ext4_has_group_desc_csum(struct super_block *sb) 3227 { 3228 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb); 3229 } 3230 3231 #define ext4_read_incompat_64bit_val(es, name) \ 3232 (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \ 3233 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \ 3234 le32_to_cpu(es->name##_lo)) 3235 3236 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 3237 { 3238 return ext4_read_incompat_64bit_val(es, s_blocks_count); 3239 } 3240 3241 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 3242 { 3243 return ext4_read_incompat_64bit_val(es, s_r_blocks_count); 3244 } 3245 3246 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 3247 { 3248 return ext4_read_incompat_64bit_val(es, s_free_blocks_count); 3249 } 3250 3251 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 3252 ext4_fsblk_t blk) 3253 { 3254 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 3255 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 3256 } 3257 3258 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 3259 ext4_fsblk_t blk) 3260 { 3261 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 3262 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 3263 } 3264 3265 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 3266 ext4_fsblk_t blk) 3267 { 3268 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 3269 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 3270 } 3271 3272 static inline loff_t ext4_isize(struct super_block *sb, 3273 struct ext4_inode *raw_inode) 3274 { 3275 if (ext4_has_feature_largedir(sb) || 3276 S_ISREG(le16_to_cpu(raw_inode->i_mode))) 3277 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 3278 le32_to_cpu(raw_inode->i_size_lo); 3279 3280 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 3281 } 3282 3283 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 3284 { 3285 raw_inode->i_size_lo = cpu_to_le32(i_size); 3286 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 3287 } 3288 3289 static inline 3290 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 3291 ext4_group_t group) 3292 { 3293 struct ext4_group_info **grp_info; 3294 long indexv, indexh; 3295 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 3296 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 3297 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 3298 grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv); 3299 return grp_info[indexh]; 3300 } 3301 3302 /* 3303 * Reading s_groups_count requires using smp_rmb() afterwards. See 3304 * the locking protocol documented in the comments of ext4_group_add() 3305 * in resize.c 3306 */ 3307 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 3308 { 3309 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 3310 3311 smp_rmb(); 3312 return ngroups; 3313 } 3314 3315 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 3316 ext4_group_t block_group) 3317 { 3318 return block_group >> sbi->s_log_groups_per_flex; 3319 } 3320 3321 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 3322 { 3323 return 1 << sbi->s_log_groups_per_flex; 3324 } 3325 3326 #define ext4_std_error(sb, errno) \ 3327 do { \ 3328 if ((errno)) \ 3329 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 3330 } while (0) 3331 3332 #ifdef CONFIG_SMP 3333 /* Each CPU can accumulate percpu_counter_batch clusters in their local 3334 * counters. So we need to make sure we have free clusters more 3335 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 3336 */ 3337 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 3338 #else 3339 #define EXT4_FREECLUSTERS_WATERMARK 0 3340 #endif 3341 3342 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 3343 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 3344 { 3345 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 3346 !inode_is_locked(inode)); 3347 down_write(&EXT4_I(inode)->i_data_sem); 3348 if (newsize > EXT4_I(inode)->i_disksize) 3349 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize); 3350 up_write(&EXT4_I(inode)->i_data_sem); 3351 } 3352 3353 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 3354 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 3355 { 3356 int changed = 0; 3357 3358 if (newsize > inode->i_size) { 3359 i_size_write(inode, newsize); 3360 changed = 1; 3361 } 3362 if (newsize > EXT4_I(inode)->i_disksize) { 3363 ext4_update_i_disksize(inode, newsize); 3364 changed |= 2; 3365 } 3366 return changed; 3367 } 3368 3369 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 3370 loff_t len); 3371 3372 struct ext4_group_info { 3373 unsigned long bb_state; 3374 #ifdef AGGRESSIVE_CHECK 3375 unsigned long bb_check_counter; 3376 #endif 3377 struct rb_root bb_free_root; 3378 ext4_grpblk_t bb_first_free; /* first free block */ 3379 ext4_grpblk_t bb_free; /* total free blocks */ 3380 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 3381 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 3382 ext4_group_t bb_group; /* Group number */ 3383 struct list_head bb_prealloc_list; 3384 #ifdef DOUBLE_CHECK 3385 void *bb_bitmap; 3386 #endif 3387 struct rw_semaphore alloc_sem; 3388 struct rb_node bb_avg_fragment_size_rb; 3389 struct list_head bb_largest_free_order_node; 3390 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 3391 * regions, index is order. 3392 * bb_counters[3] = 5 means 3393 * 5 free 8-block regions. */ 3394 }; 3395 3396 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 3397 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 3398 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 3399 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 3400 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \ 3401 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT) 3402 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \ 3403 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT) 3404 #define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4 3405 3406 #define EXT4_MB_GRP_NEED_INIT(grp) \ 3407 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 3408 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 3409 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3410 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 3411 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3412 3413 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 3414 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3415 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 3416 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3417 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 3418 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3419 #define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \ 3420 (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state))) 3421 3422 #define EXT4_MAX_CONTENTION 8 3423 #define EXT4_CONTENTION_THRESHOLD 2 3424 3425 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 3426 ext4_group_t group) 3427 { 3428 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 3429 } 3430 3431 /* 3432 * Returns true if the filesystem is busy enough that attempts to 3433 * access the block group locks has run into contention. 3434 */ 3435 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 3436 { 3437 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 3438 } 3439 3440 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 3441 { 3442 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 3443 if (spin_trylock(lock)) 3444 /* 3445 * We're able to grab the lock right away, so drop the 3446 * lock contention counter. 3447 */ 3448 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 3449 else { 3450 /* 3451 * The lock is busy, so bump the contention counter, 3452 * and then wait on the spin lock. 3453 */ 3454 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 3455 EXT4_MAX_CONTENTION); 3456 spin_lock(lock); 3457 } 3458 } 3459 3460 static inline void ext4_unlock_group(struct super_block *sb, 3461 ext4_group_t group) 3462 { 3463 spin_unlock(ext4_group_lock_ptr(sb, group)); 3464 } 3465 3466 #ifdef CONFIG_QUOTA 3467 static inline bool ext4_quota_capable(struct super_block *sb) 3468 { 3469 return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb)); 3470 } 3471 3472 static inline bool ext4_is_quota_journalled(struct super_block *sb) 3473 { 3474 struct ext4_sb_info *sbi = EXT4_SB(sb); 3475 3476 return (ext4_has_feature_quota(sb) || 3477 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]); 3478 } 3479 #endif 3480 3481 /* 3482 * Block validity checking 3483 */ 3484 #define ext4_check_indirect_blockref(inode, bh) \ 3485 ext4_check_blockref(__func__, __LINE__, inode, \ 3486 (__le32 *)(bh)->b_data, \ 3487 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 3488 3489 #define ext4_ind_check_inode(inode) \ 3490 ext4_check_blockref(__func__, __LINE__, inode, \ 3491 EXT4_I(inode)->i_data, \ 3492 EXT4_NDIR_BLOCKS) 3493 3494 /* 3495 * Inodes and files operations 3496 */ 3497 3498 /* dir.c */ 3499 extern const struct file_operations ext4_dir_operations; 3500 3501 /* file.c */ 3502 extern const struct inode_operations ext4_file_inode_operations; 3503 extern const struct file_operations ext4_file_operations; 3504 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 3505 3506 /* inline.c */ 3507 extern int ext4_get_max_inline_size(struct inode *inode); 3508 extern int ext4_find_inline_data_nolock(struct inode *inode); 3509 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 3510 unsigned int len); 3511 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 3512 3513 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 3514 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 3515 struct inode *inode, 3516 loff_t pos, unsigned len, 3517 unsigned flags, 3518 struct page **pagep); 3519 extern int ext4_write_inline_data_end(struct inode *inode, 3520 loff_t pos, unsigned len, 3521 unsigned copied, 3522 struct page *page); 3523 extern struct buffer_head * 3524 ext4_journalled_write_inline_data(struct inode *inode, 3525 unsigned len, 3526 struct page *page); 3527 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 3528 struct inode *inode, 3529 loff_t pos, unsigned len, 3530 unsigned flags, 3531 struct page **pagep, 3532 void **fsdata); 3533 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 3534 unsigned len, unsigned copied, 3535 struct page *page); 3536 extern int ext4_try_add_inline_entry(handle_t *handle, 3537 struct ext4_filename *fname, 3538 struct inode *dir, struct inode *inode); 3539 extern int ext4_try_create_inline_dir(handle_t *handle, 3540 struct inode *parent, 3541 struct inode *inode); 3542 extern int ext4_read_inline_dir(struct file *filp, 3543 struct dir_context *ctx, 3544 int *has_inline_data); 3545 extern int ext4_inlinedir_to_tree(struct file *dir_file, 3546 struct inode *dir, ext4_lblk_t block, 3547 struct dx_hash_info *hinfo, 3548 __u32 start_hash, __u32 start_minor_hash, 3549 int *has_inline_data); 3550 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3551 struct ext4_filename *fname, 3552 struct ext4_dir_entry_2 **res_dir, 3553 int *has_inline_data); 3554 extern int ext4_delete_inline_entry(handle_t *handle, 3555 struct inode *dir, 3556 struct ext4_dir_entry_2 *de_del, 3557 struct buffer_head *bh, 3558 int *has_inline_data); 3559 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); 3560 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3561 struct ext4_dir_entry_2 **parent_de, 3562 int *retval); 3563 extern int ext4_inline_data_fiemap(struct inode *inode, 3564 struct fiemap_extent_info *fieinfo, 3565 int *has_inline, __u64 start, __u64 len); 3566 3567 struct iomap; 3568 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap); 3569 3570 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3571 3572 extern int ext4_convert_inline_data(struct inode *inode); 3573 3574 static inline int ext4_has_inline_data(struct inode *inode) 3575 { 3576 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3577 EXT4_I(inode)->i_inline_off; 3578 } 3579 3580 /* namei.c */ 3581 extern const struct inode_operations ext4_dir_inode_operations; 3582 extern const struct inode_operations ext4_special_inode_operations; 3583 extern struct dentry *ext4_get_parent(struct dentry *child); 3584 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3585 struct ext4_dir_entry_2 *de, 3586 int blocksize, int csum_size, 3587 unsigned int parent_ino, int dotdot_real_len); 3588 extern void ext4_initialize_dirent_tail(struct buffer_head *bh, 3589 unsigned int blocksize); 3590 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode, 3591 struct buffer_head *bh); 3592 extern int __ext4_unlink(handle_t *handle, struct inode *dir, const struct qstr *d_name, 3593 struct inode *inode); 3594 extern int __ext4_link(struct inode *dir, struct inode *inode, 3595 struct dentry *dentry); 3596 3597 #define S_SHIFT 12 3598 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = { 3599 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3600 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3601 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3602 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3603 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3604 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3605 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3606 }; 3607 3608 static inline void ext4_set_de_type(struct super_block *sb, 3609 struct ext4_dir_entry_2 *de, 3610 umode_t mode) { 3611 if (ext4_has_feature_filetype(sb)) 3612 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3613 } 3614 3615 /* readpages.c */ 3616 extern int ext4_mpage_readpages(struct inode *inode, 3617 struct readahead_control *rac, struct page *page); 3618 extern int __init ext4_init_post_read_processing(void); 3619 extern void ext4_exit_post_read_processing(void); 3620 3621 /* symlink.c */ 3622 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3623 extern const struct inode_operations ext4_symlink_inode_operations; 3624 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3625 3626 /* sysfs.c */ 3627 extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi); 3628 extern int ext4_register_sysfs(struct super_block *sb); 3629 extern void ext4_unregister_sysfs(struct super_block *sb); 3630 extern int __init ext4_init_sysfs(void); 3631 extern void ext4_exit_sysfs(void); 3632 3633 /* block_validity */ 3634 extern void ext4_release_system_zone(struct super_block *sb); 3635 extern int ext4_setup_system_zone(struct super_block *sb); 3636 extern int __init ext4_init_system_zone(void); 3637 extern void ext4_exit_system_zone(void); 3638 extern int ext4_inode_block_valid(struct inode *inode, 3639 ext4_fsblk_t start_blk, 3640 unsigned int count); 3641 extern int ext4_check_blockref(const char *, unsigned int, 3642 struct inode *, __le32 *, unsigned int); 3643 3644 /* extents.c */ 3645 struct ext4_ext_path; 3646 struct ext4_extent; 3647 3648 /* 3649 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3650 * __le32. 3651 */ 3652 #define EXT_MAX_BLOCKS 0xffffffff 3653 3654 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode); 3655 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3656 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3657 struct ext4_map_blocks *map, int flags); 3658 extern int ext4_ext_truncate(handle_t *, struct inode *); 3659 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3660 ext4_lblk_t end); 3661 extern void ext4_ext_init(struct super_block *); 3662 extern void ext4_ext_release(struct super_block *); 3663 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3664 loff_t len); 3665 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3666 loff_t offset, ssize_t len); 3667 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle, 3668 ext4_io_end_t *io_end); 3669 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3670 struct ext4_map_blocks *map, int flags); 3671 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3672 int num, 3673 struct ext4_ext_path *path); 3674 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3675 struct ext4_ext_path **, 3676 struct ext4_extent *, int); 3677 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3678 struct ext4_ext_path **, 3679 int flags); 3680 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 3681 extern int ext4_ext_check_inode(struct inode *inode); 3682 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3683 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3684 __u64 start, __u64 len); 3685 extern int ext4_get_es_cache(struct inode *inode, 3686 struct fiemap_extent_info *fieinfo, 3687 __u64 start, __u64 len); 3688 extern int ext4_ext_precache(struct inode *inode); 3689 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3690 struct inode *inode2, ext4_lblk_t lblk1, 3691 ext4_lblk_t lblk2, ext4_lblk_t count, 3692 int mark_unwritten,int *err); 3693 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu); 3694 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode, 3695 int check_cred, int restart_cred, 3696 int revoke_cred); 3697 extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end); 3698 extern int ext4_ext_replay_set_iblocks(struct inode *inode); 3699 extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start, 3700 int len, int unwritten, ext4_fsblk_t pblk); 3701 extern int ext4_ext_clear_bb(struct inode *inode); 3702 3703 3704 /* move_extent.c */ 3705 extern void ext4_double_down_write_data_sem(struct inode *first, 3706 struct inode *second); 3707 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3708 struct inode *donor_inode); 3709 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3710 __u64 start_orig, __u64 start_donor, 3711 __u64 len, __u64 *moved_len); 3712 3713 /* page-io.c */ 3714 extern int __init ext4_init_pageio(void); 3715 extern void ext4_exit_pageio(void); 3716 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3717 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3718 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3719 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3720 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3721 struct writeback_control *wbc); 3722 extern void ext4_end_io_rsv_work(struct work_struct *work); 3723 extern void ext4_io_submit(struct ext4_io_submit *io); 3724 extern int ext4_bio_write_page(struct ext4_io_submit *io, 3725 struct page *page, 3726 int len, 3727 bool keep_towrite); 3728 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end); 3729 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end); 3730 3731 /* mmp.c */ 3732 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3733 3734 /* mmp.c */ 3735 extern void ext4_stop_mmpd(struct ext4_sb_info *sbi); 3736 3737 /* verity.c */ 3738 extern const struct fsverity_operations ext4_verityops; 3739 3740 /* 3741 * Add new method to test whether block and inode bitmaps are properly 3742 * initialized. With uninit_bg reading the block from disk is not enough 3743 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3744 */ 3745 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3746 3747 static inline int bitmap_uptodate(struct buffer_head *bh) 3748 { 3749 return (buffer_uptodate(bh) && 3750 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3751 } 3752 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3753 { 3754 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3755 } 3756 3757 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3758 3759 /* For ioend & aio unwritten conversion wait queues */ 3760 #define EXT4_WQ_HASH_SZ 37 3761 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3762 EXT4_WQ_HASH_SZ]) 3763 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3764 3765 extern int ext4_resize_begin(struct super_block *sb); 3766 extern void ext4_resize_end(struct super_block *sb); 3767 3768 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 3769 struct ext4_io_end *io_end) 3770 { 3771 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 3772 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3773 atomic_inc(&EXT4_I(inode)->i_unwritten); 3774 } 3775 } 3776 3777 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3778 { 3779 struct inode *inode = io_end->inode; 3780 3781 if (io_end->flag & EXT4_IO_END_UNWRITTEN) { 3782 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3783 /* Wake up anyone waiting on unwritten extent conversion */ 3784 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) 3785 wake_up_all(ext4_ioend_wq(inode)); 3786 } 3787 } 3788 3789 extern const struct iomap_ops ext4_iomap_ops; 3790 extern const struct iomap_ops ext4_iomap_overwrite_ops; 3791 extern const struct iomap_ops ext4_iomap_report_ops; 3792 3793 static inline int ext4_buffer_uptodate(struct buffer_head *bh) 3794 { 3795 /* 3796 * If the buffer has the write error flag, we have failed 3797 * to write out data in the block. In this case, we don't 3798 * have to read the block because we may read the old data 3799 * successfully. 3800 */ 3801 if (buffer_write_io_error(bh)) 3802 set_buffer_uptodate(bh); 3803 return buffer_uptodate(bh); 3804 } 3805 3806 #endif /* __KERNEL__ */ 3807 3808 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3809 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3810 3811 #endif /* _EXT4_H */ 3812