1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * ext4.h 4 * 5 * Copyright (C) 1992, 1993, 1994, 1995 6 * Remy Card (card@masi.ibp.fr) 7 * Laboratoire MASI - Institut Blaise Pascal 8 * Universite Pierre et Marie Curie (Paris VI) 9 * 10 * from 11 * 12 * linux/include/linux/minix_fs.h 13 * 14 * Copyright (C) 1991, 1992 Linus Torvalds 15 */ 16 17 #ifndef _EXT4_H 18 #define _EXT4_H 19 20 #include <linux/refcount.h> 21 #include <linux/types.h> 22 #include <linux/blkdev.h> 23 #include <linux/magic.h> 24 #include <linux/jbd2.h> 25 #include <linux/quota.h> 26 #include <linux/rwsem.h> 27 #include <linux/rbtree.h> 28 #include <linux/seqlock.h> 29 #include <linux/mutex.h> 30 #include <linux/timer.h> 31 #include <linux/wait.h> 32 #include <linux/sched/signal.h> 33 #include <linux/blockgroup_lock.h> 34 #include <linux/percpu_counter.h> 35 #include <linux/ratelimit.h> 36 #include <crypto/hash.h> 37 #include <linux/falloc.h> 38 #include <linux/percpu-rwsem.h> 39 #include <linux/fiemap.h> 40 #ifdef __KERNEL__ 41 #include <linux/compat.h> 42 #endif 43 44 #include <linux/fscrypt.h> 45 #include <linux/fsverity.h> 46 47 #include <linux/compiler.h> 48 49 /* 50 * The fourth extended filesystem constants/structures 51 */ 52 53 /* 54 * with AGGRESSIVE_CHECK allocator runs consistency checks over 55 * structures. these checks slow things down a lot 56 */ 57 #define AGGRESSIVE_CHECK__ 58 59 /* 60 * with DOUBLE_CHECK defined mballoc creates persistent in-core 61 * bitmaps, maintains and uses them to check for double allocations 62 */ 63 #define DOUBLE_CHECK__ 64 65 /* 66 * Define EXT4FS_DEBUG to produce debug messages 67 */ 68 #undef EXT4FS_DEBUG 69 70 /* 71 * Debug code 72 */ 73 #ifdef EXT4FS_DEBUG 74 #define ext4_debug(f, a...) \ 75 do { \ 76 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 77 __FILE__, __LINE__, __func__); \ 78 printk(KERN_DEBUG f, ## a); \ 79 } while (0) 80 #else 81 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 82 #endif 83 84 /* 85 * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c 86 */ 87 #define EXT_DEBUG__ 88 89 /* 90 * Dynamic printk for controlled extents debugging. 91 */ 92 #ifdef CONFIG_EXT4_DEBUG 93 #define ext_debug(ino, fmt, ...) \ 94 pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt, \ 95 current->comm, task_pid_nr(current), \ 96 ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__, \ 97 __func__, ##__VA_ARGS__) 98 #else 99 #define ext_debug(ino, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 100 #endif 101 102 #define ASSERT(assert) \ 103 do { \ 104 if (unlikely(!(assert))) { \ 105 printk(KERN_EMERG \ 106 "Assertion failure in %s() at %s:%d: '%s'\n", \ 107 __func__, __FILE__, __LINE__, #assert); \ 108 BUG(); \ 109 } \ 110 } while (0) 111 112 /* data type for block offset of block group */ 113 typedef int ext4_grpblk_t; 114 115 /* data type for filesystem-wide blocks number */ 116 typedef unsigned long long ext4_fsblk_t; 117 118 /* data type for file logical block number */ 119 typedef __u32 ext4_lblk_t; 120 121 /* data type for block group number */ 122 typedef unsigned int ext4_group_t; 123 124 enum SHIFT_DIRECTION { 125 SHIFT_LEFT = 0, 126 SHIFT_RIGHT, 127 }; 128 129 /* 130 * Flags used in mballoc's allocation_context flags field. 131 * 132 * Also used to show what's going on for debugging purposes when the 133 * flag field is exported via the traceport interface 134 */ 135 136 /* prefer goal again. length */ 137 #define EXT4_MB_HINT_MERGE 0x0001 138 /* blocks already reserved */ 139 #define EXT4_MB_HINT_RESERVED 0x0002 140 /* metadata is being allocated */ 141 #define EXT4_MB_HINT_METADATA 0x0004 142 /* first blocks in the file */ 143 #define EXT4_MB_HINT_FIRST 0x0008 144 /* search for the best chunk */ 145 #define EXT4_MB_HINT_BEST 0x0010 146 /* data is being allocated */ 147 #define EXT4_MB_HINT_DATA 0x0020 148 /* don't preallocate (for tails) */ 149 #define EXT4_MB_HINT_NOPREALLOC 0x0040 150 /* allocate for locality group */ 151 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 152 /* allocate goal blocks or none */ 153 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 154 /* goal is meaningful */ 155 #define EXT4_MB_HINT_TRY_GOAL 0x0200 156 /* blocks already pre-reserved by delayed allocation */ 157 #define EXT4_MB_DELALLOC_RESERVED 0x0400 158 /* We are doing stream allocation */ 159 #define EXT4_MB_STREAM_ALLOC 0x0800 160 /* Use reserved root blocks if needed */ 161 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 162 /* Use blocks from reserved pool */ 163 #define EXT4_MB_USE_RESERVED 0x2000 164 /* Do strict check for free blocks while retrying block allocation */ 165 #define EXT4_MB_STRICT_CHECK 0x4000 166 /* Large fragment size list lookup succeeded at least once for cr = 0 */ 167 #define EXT4_MB_CR0_OPTIMIZED 0x8000 168 /* Avg fragment size rb tree lookup succeeded at least once for cr = 1 */ 169 #define EXT4_MB_CR1_OPTIMIZED 0x00010000 170 /* Perform linear traversal for one group */ 171 #define EXT4_MB_SEARCH_NEXT_LINEAR 0x00020000 172 struct ext4_allocation_request { 173 /* target inode for block we're allocating */ 174 struct inode *inode; 175 /* how many blocks we want to allocate */ 176 unsigned int len; 177 /* logical block in target inode */ 178 ext4_lblk_t logical; 179 /* the closest logical allocated block to the left */ 180 ext4_lblk_t lleft; 181 /* the closest logical allocated block to the right */ 182 ext4_lblk_t lright; 183 /* phys. target (a hint) */ 184 ext4_fsblk_t goal; 185 /* phys. block for the closest logical allocated block to the left */ 186 ext4_fsblk_t pleft; 187 /* phys. block for the closest logical allocated block to the right */ 188 ext4_fsblk_t pright; 189 /* flags. see above EXT4_MB_HINT_* */ 190 unsigned int flags; 191 }; 192 193 /* 194 * Logical to physical block mapping, used by ext4_map_blocks() 195 * 196 * This structure is used to pass requests into ext4_map_blocks() as 197 * well as to store the information returned by ext4_map_blocks(). It 198 * takes less room on the stack than a struct buffer_head. 199 */ 200 #define EXT4_MAP_NEW BIT(BH_New) 201 #define EXT4_MAP_MAPPED BIT(BH_Mapped) 202 #define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten) 203 #define EXT4_MAP_BOUNDARY BIT(BH_Boundary) 204 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 205 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 206 207 struct ext4_map_blocks { 208 ext4_fsblk_t m_pblk; 209 ext4_lblk_t m_lblk; 210 unsigned int m_len; 211 unsigned int m_flags; 212 }; 213 214 /* 215 * Block validity checking, system zone rbtree. 216 */ 217 struct ext4_system_blocks { 218 struct rb_root root; 219 struct rcu_head rcu; 220 }; 221 222 /* 223 * Flags for ext4_io_end->flags 224 */ 225 #define EXT4_IO_END_UNWRITTEN 0x0001 226 227 struct ext4_io_end_vec { 228 struct list_head list; /* list of io_end_vec */ 229 loff_t offset; /* offset in the file */ 230 ssize_t size; /* size of the extent */ 231 }; 232 233 /* 234 * For converting unwritten extents on a work queue. 'handle' is used for 235 * buffered writeback. 236 */ 237 typedef struct ext4_io_end { 238 struct list_head list; /* per-file finished IO list */ 239 handle_t *handle; /* handle reserved for extent 240 * conversion */ 241 struct inode *inode; /* file being written to */ 242 struct bio *bio; /* Linked list of completed 243 * bios covering the extent */ 244 unsigned int flag; /* unwritten or not */ 245 refcount_t count; /* reference counter */ 246 struct list_head list_vec; /* list of ext4_io_end_vec */ 247 } ext4_io_end_t; 248 249 struct ext4_io_submit { 250 struct writeback_control *io_wbc; 251 struct bio *io_bio; 252 ext4_io_end_t *io_end; 253 sector_t io_next_block; 254 }; 255 256 /* 257 * Special inodes numbers 258 */ 259 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 260 #define EXT4_ROOT_INO 2 /* Root inode */ 261 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 262 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 263 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 264 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 265 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 266 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 267 268 /* First non-reserved inode for old ext4 filesystems */ 269 #define EXT4_GOOD_OLD_FIRST_INO 11 270 271 /* 272 * Maximal count of links to a file 273 */ 274 #define EXT4_LINK_MAX 65000 275 276 /* 277 * Macro-instructions used to manage several block sizes 278 */ 279 #define EXT4_MIN_BLOCK_SIZE 1024 280 #define EXT4_MAX_BLOCK_SIZE 65536 281 #define EXT4_MIN_BLOCK_LOG_SIZE 10 282 #define EXT4_MAX_BLOCK_LOG_SIZE 16 283 #define EXT4_MAX_CLUSTER_LOG_SIZE 30 284 #ifdef __KERNEL__ 285 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 286 #else 287 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 288 #endif 289 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 290 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 291 EXT4_SB(s)->s_cluster_bits) 292 #ifdef __KERNEL__ 293 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 294 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 295 #else 296 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 297 #endif 298 #ifdef __KERNEL__ 299 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 300 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 301 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 302 #else 303 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 304 EXT4_GOOD_OLD_INODE_SIZE : \ 305 (s)->s_inode_size) 306 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 307 EXT4_GOOD_OLD_FIRST_INO : \ 308 (s)->s_first_ino) 309 #endif 310 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 311 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \ 312 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \ 313 blkbits)) 314 315 /* Translate a block number to a cluster number */ 316 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 317 /* Translate a cluster number to a block number */ 318 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 319 /* Translate # of blks to # of clusters */ 320 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 321 (sbi)->s_cluster_bits) 322 /* Mask out the low bits to get the starting block of the cluster */ 323 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 324 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 325 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 326 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 327 /* Fill in the low bits to get the last block of the cluster */ 328 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \ 329 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1)) 330 /* Get the cluster offset */ 331 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 332 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 333 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 334 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 335 336 /* 337 * Structure of a blocks group descriptor 338 */ 339 struct ext4_group_desc 340 { 341 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 342 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 343 __le32 bg_inode_table_lo; /* Inodes table block */ 344 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 345 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 346 __le16 bg_used_dirs_count_lo; /* Directories count */ 347 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 348 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 349 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 350 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 351 __le16 bg_itable_unused_lo; /* Unused inodes count */ 352 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 353 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 354 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 355 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 356 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 357 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 358 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 359 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 360 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 361 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 362 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 363 __u32 bg_reserved; 364 }; 365 366 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 367 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 368 sizeof(__le16)) 369 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 370 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 371 sizeof(__le16)) 372 373 /* 374 * Structure of a flex block group info 375 */ 376 377 struct flex_groups { 378 atomic64_t free_clusters; 379 atomic_t free_inodes; 380 atomic_t used_dirs; 381 }; 382 383 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 384 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 385 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 386 387 /* 388 * Macro-instructions used to manage group descriptors 389 */ 390 #define EXT4_MIN_DESC_SIZE 32 391 #define EXT4_MIN_DESC_SIZE_64BIT 64 392 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 393 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 394 #ifdef __KERNEL__ 395 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 396 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 397 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 398 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 399 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 400 #else 401 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 402 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 403 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 404 #endif 405 406 /* 407 * Constants relative to the data blocks 408 */ 409 #define EXT4_NDIR_BLOCKS 12 410 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 411 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 412 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 413 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 414 415 /* 416 * Inode flags 417 */ 418 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 419 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 420 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 421 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 422 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 423 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 424 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 425 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 426 /* Reserved for compression usage... */ 427 #define EXT4_DIRTY_FL 0x00000100 428 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 429 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 430 /* nb: was previously EXT2_ECOMPR_FL */ 431 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 432 /* End compression flags --- maybe not all used */ 433 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 434 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 435 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 436 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 437 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 438 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 439 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 440 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 441 #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */ 442 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 443 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */ 444 445 #define EXT4_DAX_FL 0x02000000 /* Inode is DAX */ 446 447 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 448 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 449 #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */ 450 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 451 452 /* User modifiable flags */ 453 #define EXT4_FL_USER_MODIFIABLE (EXT4_SECRM_FL | \ 454 EXT4_UNRM_FL | \ 455 EXT4_COMPR_FL | \ 456 EXT4_SYNC_FL | \ 457 EXT4_IMMUTABLE_FL | \ 458 EXT4_APPEND_FL | \ 459 EXT4_NODUMP_FL | \ 460 EXT4_NOATIME_FL | \ 461 EXT4_JOURNAL_DATA_FL | \ 462 EXT4_NOTAIL_FL | \ 463 EXT4_DIRSYNC_FL | \ 464 EXT4_TOPDIR_FL | \ 465 EXT4_EXTENTS_FL | \ 466 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \ 467 EXT4_DAX_FL | \ 468 EXT4_PROJINHERIT_FL | \ 469 EXT4_CASEFOLD_FL) 470 471 /* User visible flags */ 472 #define EXT4_FL_USER_VISIBLE (EXT4_FL_USER_MODIFIABLE | \ 473 EXT4_DIRTY_FL | \ 474 EXT4_COMPRBLK_FL | \ 475 EXT4_NOCOMPR_FL | \ 476 EXT4_ENCRYPT_FL | \ 477 EXT4_INDEX_FL | \ 478 EXT4_VERITY_FL | \ 479 EXT4_INLINE_DATA_FL) 480 481 /* Flags that should be inherited by new inodes from their parent. */ 482 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 483 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 484 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 485 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 486 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\ 487 EXT4_DAX_FL) 488 489 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 490 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\ 491 EXT4_PROJINHERIT_FL)) 492 493 /* Flags that are appropriate for non-directories/regular files. */ 494 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 495 496 /* The only flags that should be swapped */ 497 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL) 498 499 /* Flags which are mutually exclusive to DAX */ 500 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\ 501 EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL) 502 503 /* Mask out flags that are inappropriate for the given type of inode. */ 504 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 505 { 506 if (S_ISDIR(mode)) 507 return flags; 508 else if (S_ISREG(mode)) 509 return flags & EXT4_REG_FLMASK; 510 else 511 return flags & EXT4_OTHER_FLMASK; 512 } 513 514 /* 515 * Inode flags used for atomic set/get 516 */ 517 enum { 518 EXT4_INODE_SECRM = 0, /* Secure deletion */ 519 EXT4_INODE_UNRM = 1, /* Undelete */ 520 EXT4_INODE_COMPR = 2, /* Compress file */ 521 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 522 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 523 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 524 EXT4_INODE_NODUMP = 6, /* do not dump file */ 525 EXT4_INODE_NOATIME = 7, /* do not update atime */ 526 /* Reserved for compression usage... */ 527 EXT4_INODE_DIRTY = 8, 528 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 529 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 530 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 531 /* End compression flags --- maybe not all used */ 532 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 533 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 534 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 535 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 536 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 537 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 538 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 539 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 540 EXT4_INODE_VERITY = 20, /* Verity protected inode */ 541 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 542 /* 22 was formerly EXT4_INODE_EOFBLOCKS */ 543 EXT4_INODE_DAX = 25, /* Inode is DAX */ 544 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 545 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 546 EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */ 547 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 548 }; 549 550 /* 551 * Since it's pretty easy to mix up bit numbers and hex values, we use a 552 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 553 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 554 * any extra space in the compiled kernel image, otherwise, the build will fail. 555 * It's important that these values are the same, since we are using 556 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 557 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 558 * values found in ext2, ext3 and ext4 filesystems, and of course the values 559 * defined in e2fsprogs. 560 * 561 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 562 */ 563 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 564 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 565 566 static inline void ext4_check_flag_values(void) 567 { 568 CHECK_FLAG_VALUE(SECRM); 569 CHECK_FLAG_VALUE(UNRM); 570 CHECK_FLAG_VALUE(COMPR); 571 CHECK_FLAG_VALUE(SYNC); 572 CHECK_FLAG_VALUE(IMMUTABLE); 573 CHECK_FLAG_VALUE(APPEND); 574 CHECK_FLAG_VALUE(NODUMP); 575 CHECK_FLAG_VALUE(NOATIME); 576 CHECK_FLAG_VALUE(DIRTY); 577 CHECK_FLAG_VALUE(COMPRBLK); 578 CHECK_FLAG_VALUE(NOCOMPR); 579 CHECK_FLAG_VALUE(ENCRYPT); 580 CHECK_FLAG_VALUE(INDEX); 581 CHECK_FLAG_VALUE(IMAGIC); 582 CHECK_FLAG_VALUE(JOURNAL_DATA); 583 CHECK_FLAG_VALUE(NOTAIL); 584 CHECK_FLAG_VALUE(DIRSYNC); 585 CHECK_FLAG_VALUE(TOPDIR); 586 CHECK_FLAG_VALUE(HUGE_FILE); 587 CHECK_FLAG_VALUE(EXTENTS); 588 CHECK_FLAG_VALUE(VERITY); 589 CHECK_FLAG_VALUE(EA_INODE); 590 CHECK_FLAG_VALUE(INLINE_DATA); 591 CHECK_FLAG_VALUE(PROJINHERIT); 592 CHECK_FLAG_VALUE(CASEFOLD); 593 CHECK_FLAG_VALUE(RESERVED); 594 } 595 596 /* Used to pass group descriptor data when online resize is done */ 597 struct ext4_new_group_input { 598 __u32 group; /* Group number for this data */ 599 __u64 block_bitmap; /* Absolute block number of block bitmap */ 600 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 601 __u64 inode_table; /* Absolute block number of inode table start */ 602 __u32 blocks_count; /* Total number of blocks in this group */ 603 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 604 __u16 unused; 605 }; 606 607 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 608 struct compat_ext4_new_group_input { 609 u32 group; 610 compat_u64 block_bitmap; 611 compat_u64 inode_bitmap; 612 compat_u64 inode_table; 613 u32 blocks_count; 614 u16 reserved_blocks; 615 u16 unused; 616 }; 617 #endif 618 619 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 620 struct ext4_new_group_data { 621 __u32 group; 622 __u64 block_bitmap; 623 __u64 inode_bitmap; 624 __u64 inode_table; 625 __u32 blocks_count; 626 __u16 reserved_blocks; 627 __u16 mdata_blocks; 628 __u32 free_clusters_count; 629 }; 630 631 /* Indexes used to index group tables in ext4_new_group_data */ 632 enum { 633 BLOCK_BITMAP = 0, /* block bitmap */ 634 INODE_BITMAP, /* inode bitmap */ 635 INODE_TABLE, /* inode tables */ 636 GROUP_TABLE_COUNT, 637 }; 638 639 /* 640 * Flags used by ext4_map_blocks() 641 */ 642 /* Allocate any needed blocks and/or convert an unwritten 643 extent to be an initialized ext4 */ 644 #define EXT4_GET_BLOCKS_CREATE 0x0001 645 /* Request the creation of an unwritten extent */ 646 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 647 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 648 EXT4_GET_BLOCKS_CREATE) 649 /* Caller is from the delayed allocation writeout path 650 * finally doing the actual allocation of delayed blocks */ 651 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 652 /* caller is from the direct IO path, request to creation of an 653 unwritten extents if not allocated, split the unwritten 654 extent if blocks has been preallocated already*/ 655 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 656 #define EXT4_GET_BLOCKS_CONVERT 0x0010 657 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 658 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 659 /* Convert extent to initialized after IO complete */ 660 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 661 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 662 /* Eventual metadata allocation (due to growing extent tree) 663 * should not fail, so try to use reserved blocks for that.*/ 664 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 665 /* Don't normalize allocation size (used for fallocate) */ 666 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 667 /* Convert written extents to unwritten */ 668 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 669 /* Write zeros to newly created written extents */ 670 #define EXT4_GET_BLOCKS_ZERO 0x0200 671 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 672 EXT4_GET_BLOCKS_ZERO) 673 /* Caller will submit data before dropping transaction handle. This 674 * allows jbd2 to avoid submitting data before commit. */ 675 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 676 /* Caller is in the atomic contex, find extent if it has been cached */ 677 #define EXT4_GET_BLOCKS_CACHED_NOWAIT 0x0800 678 679 /* 680 * The bit position of these flags must not overlap with any of the 681 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 682 * read_extent_tree_block(), ext4_split_extent_at(), 683 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 684 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 685 * caching the extents when reading from the extent tree while a 686 * truncate or punch hole operation is in progress. 687 */ 688 #define EXT4_EX_NOCACHE 0x40000000 689 #define EXT4_EX_FORCE_CACHE 0x20000000 690 #define EXT4_EX_NOFAIL 0x10000000 691 692 /* 693 * Flags used by ext4_free_blocks 694 */ 695 #define EXT4_FREE_BLOCKS_METADATA 0x0001 696 #define EXT4_FREE_BLOCKS_FORGET 0x0002 697 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 698 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 699 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 700 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 701 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040 702 703 /* 704 * ioctl commands 705 */ 706 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 707 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 708 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 709 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 710 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 711 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 712 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 713 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 714 #define EXT4_IOC_MIGRATE _IO('f', 9) 715 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 716 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 717 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 718 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 719 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 720 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 721 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 722 /* ioctl codes 19--39 are reserved for fscrypt */ 723 #define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40) 724 #define EXT4_IOC_GETSTATE _IOW('f', 41, __u32) 725 #define EXT4_IOC_GET_ES_CACHE _IOWR('f', 42, struct fiemap) 726 #define EXT4_IOC_CHECKPOINT _IOW('f', 43, __u32) 727 728 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32) 729 730 /* 731 * Flags for going down operation 732 */ 733 #define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */ 734 #define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */ 735 #define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */ 736 737 /* 738 * Flags returned by EXT4_IOC_GETSTATE 739 * 740 * We only expose to userspace a subset of the state flags in 741 * i_state_flags 742 */ 743 #define EXT4_STATE_FLAG_EXT_PRECACHED 0x00000001 744 #define EXT4_STATE_FLAG_NEW 0x00000002 745 #define EXT4_STATE_FLAG_NEWENTRY 0x00000004 746 #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE 0x00000008 747 748 /* flags for ioctl EXT4_IOC_CHECKPOINT */ 749 #define EXT4_IOC_CHECKPOINT_FLAG_DISCARD 0x1 750 #define EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT 0x2 751 #define EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN 0x4 752 #define EXT4_IOC_CHECKPOINT_FLAG_VALID (EXT4_IOC_CHECKPOINT_FLAG_DISCARD | \ 753 EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT | \ 754 EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN) 755 756 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 757 /* 758 * ioctl commands in 32 bit emulation 759 */ 760 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 761 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 762 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 763 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 764 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 765 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 766 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 767 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 768 #endif 769 770 /* 771 * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag. 772 * It indicates that the entry in extent status cache is for a hole. 773 */ 774 #define EXT4_FIEMAP_EXTENT_HOLE 0x08000000 775 776 /* Max physical block we can address w/o extents */ 777 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 778 779 /* Max logical block we can support */ 780 #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE 781 782 /* 783 * Structure of an inode on the disk 784 */ 785 struct ext4_inode { 786 __le16 i_mode; /* File mode */ 787 __le16 i_uid; /* Low 16 bits of Owner Uid */ 788 __le32 i_size_lo; /* Size in bytes */ 789 __le32 i_atime; /* Access time */ 790 __le32 i_ctime; /* Inode Change time */ 791 __le32 i_mtime; /* Modification time */ 792 __le32 i_dtime; /* Deletion Time */ 793 __le16 i_gid; /* Low 16 bits of Group Id */ 794 __le16 i_links_count; /* Links count */ 795 __le32 i_blocks_lo; /* Blocks count */ 796 __le32 i_flags; /* File flags */ 797 union { 798 struct { 799 __le32 l_i_version; 800 } linux1; 801 struct { 802 __u32 h_i_translator; 803 } hurd1; 804 struct { 805 __u32 m_i_reserved1; 806 } masix1; 807 } osd1; /* OS dependent 1 */ 808 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 809 __le32 i_generation; /* File version (for NFS) */ 810 __le32 i_file_acl_lo; /* File ACL */ 811 __le32 i_size_high; 812 __le32 i_obso_faddr; /* Obsoleted fragment address */ 813 union { 814 struct { 815 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 816 __le16 l_i_file_acl_high; 817 __le16 l_i_uid_high; /* these 2 fields */ 818 __le16 l_i_gid_high; /* were reserved2[0] */ 819 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 820 __le16 l_i_reserved; 821 } linux2; 822 struct { 823 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 824 __u16 h_i_mode_high; 825 __u16 h_i_uid_high; 826 __u16 h_i_gid_high; 827 __u32 h_i_author; 828 } hurd2; 829 struct { 830 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 831 __le16 m_i_file_acl_high; 832 __u32 m_i_reserved2[2]; 833 } masix2; 834 } osd2; /* OS dependent 2 */ 835 __le16 i_extra_isize; 836 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 837 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 838 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 839 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 840 __le32 i_crtime; /* File Creation time */ 841 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 842 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 843 __le32 i_projid; /* Project ID */ 844 }; 845 846 struct move_extent { 847 __u32 reserved; /* should be zero */ 848 __u32 donor_fd; /* donor file descriptor */ 849 __u64 orig_start; /* logical start offset in block for orig */ 850 __u64 donor_start; /* logical start offset in block for donor */ 851 __u64 len; /* block length to be moved */ 852 __u64 moved_len; /* moved block length */ 853 }; 854 855 #define EXT4_EPOCH_BITS 2 856 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 857 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 858 859 /* 860 * Extended fields will fit into an inode if the filesystem was formatted 861 * with large inodes (-I 256 or larger) and there are not currently any EAs 862 * consuming all of the available space. For new inodes we always reserve 863 * enough space for the kernel's known extended fields, but for inodes 864 * created with an old kernel this might not have been the case. None of 865 * the extended inode fields is critical for correct filesystem operation. 866 * This macro checks if a certain field fits in the inode. Note that 867 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 868 */ 869 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 870 ((offsetof(typeof(*ext4_inode), field) + \ 871 sizeof((ext4_inode)->field)) \ 872 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 873 (einode)->i_extra_isize)) \ 874 875 /* 876 * We use an encoding that preserves the times for extra epoch "00": 877 * 878 * extra msb of adjust for signed 879 * epoch 32-bit 32-bit tv_sec to 880 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 881 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 882 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 883 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 884 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 885 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 886 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 887 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 888 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 889 * 890 * Note that previous versions of the kernel on 64-bit systems would 891 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 892 * 1970. e2fsck will correct this, assuming that it is run on the 893 * affected filesystem before 2242. 894 */ 895 896 static inline __le32 ext4_encode_extra_time(struct timespec64 *time) 897 { 898 u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK; 899 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); 900 } 901 902 static inline void ext4_decode_extra_time(struct timespec64 *time, 903 __le32 extra) 904 { 905 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) 906 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 907 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 908 } 909 910 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 911 do { \ 912 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\ 913 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 914 (raw_inode)->xtime ## _extra = \ 915 ext4_encode_extra_time(&(inode)->xtime); \ 916 } \ 917 else \ 918 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX)); \ 919 } while (0) 920 921 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 922 do { \ 923 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 924 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 925 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 926 (raw_inode)->xtime ## _extra = \ 927 ext4_encode_extra_time(&(einode)->xtime); \ 928 } while (0) 929 930 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 931 do { \ 932 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 933 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \ 934 ext4_decode_extra_time(&(inode)->xtime, \ 935 raw_inode->xtime ## _extra); \ 936 } \ 937 else \ 938 (inode)->xtime.tv_nsec = 0; \ 939 } while (0) 940 941 942 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 943 do { \ 944 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 945 (einode)->xtime.tv_sec = \ 946 (signed)le32_to_cpu((raw_inode)->xtime); \ 947 else \ 948 (einode)->xtime.tv_sec = 0; \ 949 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 950 ext4_decode_extra_time(&(einode)->xtime, \ 951 raw_inode->xtime ## _extra); \ 952 else \ 953 (einode)->xtime.tv_nsec = 0; \ 954 } while (0) 955 956 #define i_disk_version osd1.linux1.l_i_version 957 958 #if defined(__KERNEL__) || defined(__linux__) 959 #define i_reserved1 osd1.linux1.l_i_reserved1 960 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 961 #define i_blocks_high osd2.linux2.l_i_blocks_high 962 #define i_uid_low i_uid 963 #define i_gid_low i_gid 964 #define i_uid_high osd2.linux2.l_i_uid_high 965 #define i_gid_high osd2.linux2.l_i_gid_high 966 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 967 968 #elif defined(__GNU__) 969 970 #define i_translator osd1.hurd1.h_i_translator 971 #define i_uid_high osd2.hurd2.h_i_uid_high 972 #define i_gid_high osd2.hurd2.h_i_gid_high 973 #define i_author osd2.hurd2.h_i_author 974 975 #elif defined(__masix__) 976 977 #define i_reserved1 osd1.masix1.m_i_reserved1 978 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 979 #define i_reserved2 osd2.masix2.m_i_reserved2 980 981 #endif /* defined(__KERNEL__) || defined(__linux__) */ 982 983 #include "extents_status.h" 984 #include "fast_commit.h" 985 986 /* 987 * Lock subclasses for i_data_sem in the ext4_inode_info structure. 988 * 989 * These are needed to avoid lockdep false positives when we need to 990 * allocate blocks to the quota inode during ext4_map_blocks(), while 991 * holding i_data_sem for a normal (non-quota) inode. Since we don't 992 * do quota tracking for the quota inode, this avoids deadlock (as 993 * well as infinite recursion, since it isn't turtles all the way 994 * down...) 995 * 996 * I_DATA_SEM_NORMAL - Used for most inodes 997 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode 998 * where the second inode has larger inode number 999 * than the first 1000 * I_DATA_SEM_QUOTA - Used for quota inodes only 1001 */ 1002 enum { 1003 I_DATA_SEM_NORMAL = 0, 1004 I_DATA_SEM_OTHER, 1005 I_DATA_SEM_QUOTA, 1006 }; 1007 1008 1009 /* 1010 * fourth extended file system inode data in memory 1011 */ 1012 struct ext4_inode_info { 1013 __le32 i_data[15]; /* unconverted */ 1014 __u32 i_dtime; 1015 ext4_fsblk_t i_file_acl; 1016 1017 /* 1018 * i_block_group is the number of the block group which contains 1019 * this file's inode. Constant across the lifetime of the inode, 1020 * it is used for making block allocation decisions - we try to 1021 * place a file's data blocks near its inode block, and new inodes 1022 * near to their parent directory's inode. 1023 */ 1024 ext4_group_t i_block_group; 1025 ext4_lblk_t i_dir_start_lookup; 1026 #if (BITS_PER_LONG < 64) 1027 unsigned long i_state_flags; /* Dynamic state flags */ 1028 #endif 1029 unsigned long i_flags; 1030 1031 /* 1032 * Extended attributes can be read independently of the main file 1033 * data. Taking i_rwsem even when reading would cause contention 1034 * between readers of EAs and writers of regular file data, so 1035 * instead we synchronize on xattr_sem when reading or changing 1036 * EAs. 1037 */ 1038 struct rw_semaphore xattr_sem; 1039 1040 /* 1041 * Inodes with EXT4_STATE_ORPHAN_FILE use i_orphan_idx. Otherwise 1042 * i_orphan is used. 1043 */ 1044 union { 1045 struct list_head i_orphan; /* unlinked but open inodes */ 1046 unsigned int i_orphan_idx; /* Index in orphan file */ 1047 }; 1048 1049 /* Fast commit related info */ 1050 1051 /* For tracking dentry create updates */ 1052 struct list_head i_fc_dilist; 1053 struct list_head i_fc_list; /* 1054 * inodes that need fast commit 1055 * protected by sbi->s_fc_lock. 1056 */ 1057 1058 /* Start of lblk range that needs to be committed in this fast commit */ 1059 ext4_lblk_t i_fc_lblk_start; 1060 1061 /* End of lblk range that needs to be committed in this fast commit */ 1062 ext4_lblk_t i_fc_lblk_len; 1063 1064 /* Number of ongoing updates on this inode */ 1065 atomic_t i_fc_updates; 1066 1067 /* Fast commit wait queue for this inode */ 1068 wait_queue_head_t i_fc_wait; 1069 1070 /* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */ 1071 struct mutex i_fc_lock; 1072 1073 /* 1074 * i_disksize keeps track of what the inode size is ON DISK, not 1075 * in memory. During truncate, i_size is set to the new size by 1076 * the VFS prior to calling ext4_truncate(), but the filesystem won't 1077 * set i_disksize to 0 until the truncate is actually under way. 1078 * 1079 * The intent is that i_disksize always represents the blocks which 1080 * are used by this file. This allows recovery to restart truncate 1081 * on orphans if we crash during truncate. We actually write i_disksize 1082 * into the on-disk inode when writing inodes out, instead of i_size. 1083 * 1084 * The only time when i_disksize and i_size may be different is when 1085 * a truncate is in progress. The only things which change i_disksize 1086 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 1087 */ 1088 loff_t i_disksize; 1089 1090 /* 1091 * i_data_sem is for serialising ext4_truncate() against 1092 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 1093 * data tree are chopped off during truncate. We can't do that in 1094 * ext4 because whenever we perform intermediate commits during 1095 * truncate, the inode and all the metadata blocks *must* be in a 1096 * consistent state which allows truncation of the orphans to restart 1097 * during recovery. Hence we must fix the get_block-vs-truncate race 1098 * by other means, so we have i_data_sem. 1099 */ 1100 struct rw_semaphore i_data_sem; 1101 struct inode vfs_inode; 1102 struct jbd2_inode *jinode; 1103 1104 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 1105 1106 /* 1107 * File creation time. Its function is same as that of 1108 * struct timespec64 i_{a,c,m}time in the generic inode. 1109 */ 1110 struct timespec64 i_crtime; 1111 1112 /* mballoc */ 1113 atomic_t i_prealloc_active; 1114 struct list_head i_prealloc_list; 1115 spinlock_t i_prealloc_lock; 1116 1117 /* extents status tree */ 1118 struct ext4_es_tree i_es_tree; 1119 rwlock_t i_es_lock; 1120 struct list_head i_es_list; 1121 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1122 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1123 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1124 extents to shrink. Protected by 1125 i_es_lock */ 1126 1127 /* ialloc */ 1128 ext4_group_t i_last_alloc_group; 1129 1130 /* allocation reservation info for delalloc */ 1131 /* In case of bigalloc, this refer to clusters rather than blocks */ 1132 unsigned int i_reserved_data_blocks; 1133 1134 /* pending cluster reservations for bigalloc file systems */ 1135 struct ext4_pending_tree i_pending_tree; 1136 1137 /* on-disk additional length */ 1138 __u16 i_extra_isize; 1139 1140 /* Indicate the inline data space. */ 1141 u16 i_inline_off; 1142 u16 i_inline_size; 1143 1144 #ifdef CONFIG_QUOTA 1145 /* quota space reservation, managed internally by quota code */ 1146 qsize_t i_reserved_quota; 1147 #endif 1148 1149 /* Lock protecting lists below */ 1150 spinlock_t i_completed_io_lock; 1151 /* 1152 * Completed IOs that need unwritten extents handling and have 1153 * transaction reserved 1154 */ 1155 struct list_head i_rsv_conversion_list; 1156 struct work_struct i_rsv_conversion_work; 1157 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 1158 1159 spinlock_t i_block_reservation_lock; 1160 1161 /* 1162 * Transactions that contain inode's metadata needed to complete 1163 * fsync and fdatasync, respectively. 1164 */ 1165 tid_t i_sync_tid; 1166 tid_t i_datasync_tid; 1167 1168 #ifdef CONFIG_QUOTA 1169 struct dquot *i_dquot[MAXQUOTAS]; 1170 #endif 1171 1172 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1173 __u32 i_csum_seed; 1174 1175 kprojid_t i_projid; 1176 }; 1177 1178 /* 1179 * File system states 1180 */ 1181 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1182 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1183 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1184 #define EXT4_FC_REPLAY 0x0020 /* Fast commit replay ongoing */ 1185 1186 /* 1187 * Misc. filesystem flags 1188 */ 1189 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1190 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1191 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1192 1193 /* 1194 * Mount flags set via mount options or defaults 1195 */ 1196 #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */ 1197 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1198 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1199 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1200 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1201 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1202 #define EXT4_MOUNT_ERRORS_MASK 0x00070 1203 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1204 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1205 #ifdef CONFIG_FS_DAX 1206 #define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */ 1207 #else 1208 #define EXT4_MOUNT_DAX_ALWAYS 0 1209 #endif 1210 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1211 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1212 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1213 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1214 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1215 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1216 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1217 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1218 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1219 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1220 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */ 1221 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota, 1222 * enable enforcement for hidden 1223 * quota files */ 1224 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable 1225 * enforcement for hidden quota 1226 * files */ 1227 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota 1228 * enforcement */ 1229 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1230 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1231 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1232 #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */ 1233 #define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000 1234 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1235 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1236 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1237 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1238 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1239 1240 /* 1241 * Mount flags set either automatically (could not be set by mount option) 1242 * based on per file system feature or property or in special cases such as 1243 * distinguishing between explicit mount option definition and default. 1244 */ 1245 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1246 specified delalloc */ 1247 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1248 size of blocksize * 8 1249 blocks */ 1250 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1251 file systems */ 1252 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1253 specified journal checksum */ 1254 1255 #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */ 1256 #define EXT4_MOUNT2_DAX_NEVER 0x00000020 /* Do not allow Direct Access */ 1257 #define EXT4_MOUNT2_DAX_INODE 0x00000040 /* For printing options only */ 1258 #define EXT4_MOUNT2_MB_OPTIMIZE_SCAN 0x00000080 /* Optimize group 1259 * scanning in mballoc 1260 */ 1261 1262 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1263 ~EXT4_MOUNT_##opt 1264 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1265 EXT4_MOUNT_##opt 1266 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1267 EXT4_MOUNT_##opt) 1268 1269 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1270 ~EXT4_MOUNT2_##opt 1271 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1272 EXT4_MOUNT2_##opt 1273 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1274 EXT4_MOUNT2_##opt) 1275 1276 #define ext4_test_and_set_bit __test_and_set_bit_le 1277 #define ext4_set_bit __set_bit_le 1278 #define ext4_set_bit_atomic ext2_set_bit_atomic 1279 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1280 #define ext4_clear_bit __clear_bit_le 1281 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1282 #define ext4_test_bit test_bit_le 1283 #define ext4_find_next_zero_bit find_next_zero_bit_le 1284 #define ext4_find_next_bit find_next_bit_le 1285 1286 extern void mb_set_bits(void *bm, int cur, int len); 1287 1288 /* 1289 * Maximal mount counts between two filesystem checks 1290 */ 1291 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1292 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1293 1294 /* 1295 * Behaviour when detecting errors 1296 */ 1297 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1298 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1299 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1300 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1301 1302 /* Metadata checksum algorithm codes */ 1303 #define EXT4_CRC32C_CHKSUM 1 1304 1305 #define EXT4_LABEL_MAX 16 1306 1307 /* 1308 * Structure of the super block 1309 */ 1310 struct ext4_super_block { 1311 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1312 __le32 s_blocks_count_lo; /* Blocks count */ 1313 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1314 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1315 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1316 __le32 s_first_data_block; /* First Data Block */ 1317 __le32 s_log_block_size; /* Block size */ 1318 __le32 s_log_cluster_size; /* Allocation cluster size */ 1319 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1320 __le32 s_clusters_per_group; /* # Clusters per group */ 1321 __le32 s_inodes_per_group; /* # Inodes per group */ 1322 __le32 s_mtime; /* Mount time */ 1323 /*30*/ __le32 s_wtime; /* Write time */ 1324 __le16 s_mnt_count; /* Mount count */ 1325 __le16 s_max_mnt_count; /* Maximal mount count */ 1326 __le16 s_magic; /* Magic signature */ 1327 __le16 s_state; /* File system state */ 1328 __le16 s_errors; /* Behaviour when detecting errors */ 1329 __le16 s_minor_rev_level; /* minor revision level */ 1330 /*40*/ __le32 s_lastcheck; /* time of last check */ 1331 __le32 s_checkinterval; /* max. time between checks */ 1332 __le32 s_creator_os; /* OS */ 1333 __le32 s_rev_level; /* Revision level */ 1334 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1335 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1336 /* 1337 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1338 * 1339 * Note: the difference between the compatible feature set and 1340 * the incompatible feature set is that if there is a bit set 1341 * in the incompatible feature set that the kernel doesn't 1342 * know about, it should refuse to mount the filesystem. 1343 * 1344 * e2fsck's requirements are more strict; if it doesn't know 1345 * about a feature in either the compatible or incompatible 1346 * feature set, it must abort and not try to meddle with 1347 * things it doesn't understand... 1348 */ 1349 __le32 s_first_ino; /* First non-reserved inode */ 1350 __le16 s_inode_size; /* size of inode structure */ 1351 __le16 s_block_group_nr; /* block group # of this superblock */ 1352 __le32 s_feature_compat; /* compatible feature set */ 1353 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1354 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1355 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1356 /*78*/ char s_volume_name[EXT4_LABEL_MAX]; /* volume name */ 1357 /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */ 1358 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1359 /* 1360 * Performance hints. Directory preallocation should only 1361 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1362 */ 1363 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1364 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1365 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1366 /* 1367 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1368 */ 1369 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1370 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1371 __le32 s_journal_dev; /* device number of journal file */ 1372 __le32 s_last_orphan; /* start of list of inodes to delete */ 1373 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1374 __u8 s_def_hash_version; /* Default hash version to use */ 1375 __u8 s_jnl_backup_type; 1376 __le16 s_desc_size; /* size of group descriptor */ 1377 /*100*/ __le32 s_default_mount_opts; 1378 __le32 s_first_meta_bg; /* First metablock block group */ 1379 __le32 s_mkfs_time; /* When the filesystem was created */ 1380 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1381 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1382 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1383 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1384 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1385 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1386 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1387 __le32 s_flags; /* Miscellaneous flags */ 1388 __le16 s_raid_stride; /* RAID stride */ 1389 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1390 __le64 s_mmp_block; /* Block for multi-mount protection */ 1391 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1392 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1393 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1394 __u8 s_encryption_level; /* versioning level for encryption */ 1395 __u8 s_reserved_pad; /* Padding to next 32bits */ 1396 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1397 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1398 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1399 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1400 snapshot's future use */ 1401 __le32 s_snapshot_list; /* inode number of the head of the 1402 on-disk snapshot list */ 1403 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1404 __le32 s_error_count; /* number of fs errors */ 1405 __le32 s_first_error_time; /* first time an error happened */ 1406 __le32 s_first_error_ino; /* inode involved in first error */ 1407 __le64 s_first_error_block; /* block involved of first error */ 1408 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */ 1409 __le32 s_first_error_line; /* line number where error happened */ 1410 __le32 s_last_error_time; /* most recent time of an error */ 1411 __le32 s_last_error_ino; /* inode involved in last error */ 1412 __le32 s_last_error_line; /* line number where error happened */ 1413 __le64 s_last_error_block; /* block involved of last error */ 1414 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */ 1415 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1416 __u8 s_mount_opts[64]; 1417 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1418 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1419 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1420 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1421 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1422 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1423 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1424 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1425 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1426 __u8 s_wtime_hi; 1427 __u8 s_mtime_hi; 1428 __u8 s_mkfs_time_hi; 1429 __u8 s_lastcheck_hi; 1430 __u8 s_first_error_time_hi; 1431 __u8 s_last_error_time_hi; 1432 __u8 s_first_error_errcode; 1433 __u8 s_last_error_errcode; 1434 __le16 s_encoding; /* Filename charset encoding */ 1435 __le16 s_encoding_flags; /* Filename charset encoding flags */ 1436 __le32 s_orphan_file_inum; /* Inode for tracking orphan inodes */ 1437 __le32 s_reserved[94]; /* Padding to the end of the block */ 1438 __le32 s_checksum; /* crc32c(superblock) */ 1439 }; 1440 1441 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1442 1443 #ifdef __KERNEL__ 1444 1445 #ifdef CONFIG_FS_ENCRYPTION 1446 #define DUMMY_ENCRYPTION_ENABLED(sbi) ((sbi)->s_dummy_enc_policy.policy != NULL) 1447 #else 1448 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0) 1449 #endif 1450 1451 /* Number of quota types we support */ 1452 #define EXT4_MAXQUOTAS 3 1453 1454 #define EXT4_ENC_UTF8_12_1 1 1455 1456 /* Types of ext4 journal triggers */ 1457 enum ext4_journal_trigger_type { 1458 EXT4_JTR_ORPHAN_FILE, 1459 EXT4_JTR_NONE /* This must be the last entry for indexing to work! */ 1460 }; 1461 1462 #define EXT4_JOURNAL_TRIGGER_COUNT EXT4_JTR_NONE 1463 1464 struct ext4_journal_trigger { 1465 struct jbd2_buffer_trigger_type tr_triggers; 1466 struct super_block *sb; 1467 }; 1468 1469 static inline struct ext4_journal_trigger *EXT4_TRIGGER( 1470 struct jbd2_buffer_trigger_type *trigger) 1471 { 1472 return container_of(trigger, struct ext4_journal_trigger, tr_triggers); 1473 } 1474 1475 #define EXT4_ORPHAN_BLOCK_MAGIC 0x0b10ca04 1476 1477 /* Structure at the tail of orphan block */ 1478 struct ext4_orphan_block_tail { 1479 __le32 ob_magic; 1480 __le32 ob_checksum; 1481 }; 1482 1483 static inline int ext4_inodes_per_orphan_block(struct super_block *sb) 1484 { 1485 return (sb->s_blocksize - sizeof(struct ext4_orphan_block_tail)) / 1486 sizeof(u32); 1487 } 1488 1489 struct ext4_orphan_block { 1490 atomic_t ob_free_entries; /* Number of free orphan entries in block */ 1491 struct buffer_head *ob_bh; /* Buffer for orphan block */ 1492 }; 1493 1494 /* 1495 * Info about orphan file. 1496 */ 1497 struct ext4_orphan_info { 1498 int of_blocks; /* Number of orphan blocks in a file */ 1499 __u32 of_csum_seed; /* Checksum seed for orphan file */ 1500 struct ext4_orphan_block *of_binfo; /* Array with info about orphan 1501 * file blocks */ 1502 }; 1503 1504 /* 1505 * fourth extended-fs super-block data in memory 1506 */ 1507 struct ext4_sb_info { 1508 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1509 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1510 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1511 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1512 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1513 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1514 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1515 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1516 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1517 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1518 unsigned long s_overhead; /* # of fs overhead clusters */ 1519 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1520 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1521 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1522 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1523 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1524 struct buffer_head * __rcu *s_group_desc; 1525 unsigned int s_mount_opt; 1526 unsigned int s_mount_opt2; 1527 unsigned long s_mount_flags; 1528 unsigned int s_def_mount_opt; 1529 ext4_fsblk_t s_sb_block; 1530 atomic64_t s_resv_clusters; 1531 kuid_t s_resuid; 1532 kgid_t s_resgid; 1533 unsigned short s_mount_state; 1534 unsigned short s_pad; 1535 int s_addr_per_block_bits; 1536 int s_desc_per_block_bits; 1537 int s_inode_size; 1538 int s_first_ino; 1539 unsigned int s_inode_readahead_blks; 1540 unsigned int s_inode_goal; 1541 u32 s_hash_seed[4]; 1542 int s_def_hash_version; 1543 int s_hash_unsigned; /* 3 if hash should be unsigned, 0 if not */ 1544 struct percpu_counter s_freeclusters_counter; 1545 struct percpu_counter s_freeinodes_counter; 1546 struct percpu_counter s_dirs_counter; 1547 struct percpu_counter s_dirtyclusters_counter; 1548 struct percpu_counter s_sra_exceeded_retry_limit; 1549 struct blockgroup_lock *s_blockgroup_lock; 1550 struct proc_dir_entry *s_proc; 1551 struct kobject s_kobj; 1552 struct completion s_kobj_unregister; 1553 struct super_block *s_sb; 1554 struct buffer_head *s_mmp_bh; 1555 1556 /* Journaling */ 1557 struct journal_s *s_journal; 1558 unsigned long s_ext4_flags; /* Ext4 superblock flags */ 1559 struct mutex s_orphan_lock; /* Protects on disk list changes */ 1560 struct list_head s_orphan; /* List of orphaned inodes in on disk 1561 list */ 1562 struct ext4_orphan_info s_orphan_info; 1563 unsigned long s_commit_interval; 1564 u32 s_max_batch_time; 1565 u32 s_min_batch_time; 1566 struct block_device *s_journal_bdev; 1567 #ifdef CONFIG_QUOTA 1568 /* Names of quota files with journalled quota */ 1569 char __rcu *s_qf_names[EXT4_MAXQUOTAS]; 1570 int s_jquota_fmt; /* Format of quota to use */ 1571 #endif 1572 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1573 struct ext4_system_blocks __rcu *s_system_blks; 1574 1575 #ifdef EXTENTS_STATS 1576 /* ext4 extents stats */ 1577 unsigned long s_ext_min; 1578 unsigned long s_ext_max; 1579 unsigned long s_depth_max; 1580 spinlock_t s_ext_stats_lock; 1581 unsigned long s_ext_blocks; 1582 unsigned long s_ext_extents; 1583 #endif 1584 1585 /* for buddy allocator */ 1586 struct ext4_group_info ** __rcu *s_group_info; 1587 struct inode *s_buddy_cache; 1588 spinlock_t s_md_lock; 1589 unsigned short *s_mb_offsets; 1590 unsigned int *s_mb_maxs; 1591 unsigned int s_group_info_size; 1592 unsigned int s_mb_free_pending; 1593 struct list_head s_freed_data_list; /* List of blocks to be freed 1594 after commit completed */ 1595 struct list_head s_discard_list; 1596 struct work_struct s_discard_work; 1597 atomic_t s_retry_alloc_pending; 1598 struct rb_root s_mb_avg_fragment_size_root; 1599 rwlock_t s_mb_rb_lock; 1600 struct list_head *s_mb_largest_free_orders; 1601 rwlock_t *s_mb_largest_free_orders_locks; 1602 1603 /* tunables */ 1604 unsigned long s_stripe; 1605 unsigned int s_mb_max_linear_groups; 1606 unsigned int s_mb_stream_request; 1607 unsigned int s_mb_max_to_scan; 1608 unsigned int s_mb_min_to_scan; 1609 unsigned int s_mb_stats; 1610 unsigned int s_mb_order2_reqs; 1611 unsigned int s_mb_group_prealloc; 1612 unsigned int s_mb_max_inode_prealloc; 1613 unsigned int s_max_dir_size_kb; 1614 /* where last allocation was done - for stream allocation */ 1615 unsigned long s_mb_last_group; 1616 unsigned long s_mb_last_start; 1617 unsigned int s_mb_prefetch; 1618 unsigned int s_mb_prefetch_limit; 1619 1620 /* stats for buddy allocator */ 1621 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1622 atomic_t s_bal_success; /* we found long enough chunks */ 1623 atomic_t s_bal_allocated; /* in blocks */ 1624 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1625 atomic_t s_bal_groups_scanned; /* number of groups scanned */ 1626 atomic_t s_bal_goals; /* goal hits */ 1627 atomic_t s_bal_breaks; /* too long searches */ 1628 atomic_t s_bal_2orders; /* 2^order hits */ 1629 atomic_t s_bal_cr0_bad_suggestions; 1630 atomic_t s_bal_cr1_bad_suggestions; 1631 atomic64_t s_bal_cX_groups_considered[4]; 1632 atomic64_t s_bal_cX_hits[4]; 1633 atomic64_t s_bal_cX_failed[4]; /* cX loop didn't find blocks */ 1634 atomic_t s_mb_buddies_generated; /* number of buddies generated */ 1635 atomic64_t s_mb_generation_time; 1636 atomic_t s_mb_lost_chunks; 1637 atomic_t s_mb_preallocated; 1638 atomic_t s_mb_discarded; 1639 atomic_t s_lock_busy; 1640 1641 /* locality groups */ 1642 struct ext4_locality_group __percpu *s_locality_groups; 1643 1644 /* for write statistics */ 1645 unsigned long s_sectors_written_start; 1646 u64 s_kbytes_written; 1647 1648 /* the size of zero-out chunk */ 1649 unsigned int s_extent_max_zeroout_kb; 1650 1651 unsigned int s_log_groups_per_flex; 1652 struct flex_groups * __rcu *s_flex_groups; 1653 ext4_group_t s_flex_groups_allocated; 1654 1655 /* workqueue for reserved extent conversions (buffered io) */ 1656 struct workqueue_struct *rsv_conversion_wq; 1657 1658 /* timer for periodic error stats printing */ 1659 struct timer_list s_err_report; 1660 1661 /* Lazy inode table initialization info */ 1662 struct ext4_li_request *s_li_request; 1663 /* Wait multiplier for lazy initialization thread */ 1664 unsigned int s_li_wait_mult; 1665 1666 /* Kernel thread for multiple mount protection */ 1667 struct task_struct *s_mmp_tsk; 1668 1669 /* record the last minlen when FITRIM is called. */ 1670 unsigned long s_last_trim_minblks; 1671 1672 /* Reference to checksum algorithm driver via cryptoapi */ 1673 struct crypto_shash *s_chksum_driver; 1674 1675 /* Precomputed FS UUID checksum for seeding other checksums */ 1676 __u32 s_csum_seed; 1677 1678 /* Reclaim extents from extent status tree */ 1679 struct shrinker s_es_shrinker; 1680 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1681 long s_es_nr_inode; 1682 struct ext4_es_stats s_es_stats; 1683 struct mb_cache *s_ea_block_cache; 1684 struct mb_cache *s_ea_inode_cache; 1685 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1686 1687 /* Journal triggers for checksum computation */ 1688 struct ext4_journal_trigger s_journal_triggers[EXT4_JOURNAL_TRIGGER_COUNT]; 1689 1690 /* Ratelimit ext4 messages. */ 1691 struct ratelimit_state s_err_ratelimit_state; 1692 struct ratelimit_state s_warning_ratelimit_state; 1693 struct ratelimit_state s_msg_ratelimit_state; 1694 atomic_t s_warning_count; 1695 atomic_t s_msg_count; 1696 1697 /* Encryption policy for '-o test_dummy_encryption' */ 1698 struct fscrypt_dummy_policy s_dummy_enc_policy; 1699 1700 /* 1701 * Barrier between writepages ops and changing any inode's JOURNAL_DATA 1702 * or EXTENTS flag. 1703 */ 1704 struct percpu_rw_semaphore s_writepages_rwsem; 1705 struct dax_device *s_daxdev; 1706 u64 s_dax_part_off; 1707 #ifdef CONFIG_EXT4_DEBUG 1708 unsigned long s_simulate_fail; 1709 #endif 1710 /* Record the errseq of the backing block device */ 1711 errseq_t s_bdev_wb_err; 1712 spinlock_t s_bdev_wb_lock; 1713 1714 /* Information about errors that happened during this mount */ 1715 spinlock_t s_error_lock; 1716 int s_add_error_count; 1717 int s_first_error_code; 1718 __u32 s_first_error_line; 1719 __u32 s_first_error_ino; 1720 __u64 s_first_error_block; 1721 const char *s_first_error_func; 1722 time64_t s_first_error_time; 1723 int s_last_error_code; 1724 __u32 s_last_error_line; 1725 __u32 s_last_error_ino; 1726 __u64 s_last_error_block; 1727 const char *s_last_error_func; 1728 time64_t s_last_error_time; 1729 /* 1730 * If we are in a context where we cannot update error information in 1731 * the on-disk superblock, we queue this work to do it. 1732 */ 1733 struct work_struct s_error_work; 1734 1735 /* Ext4 fast commit sub transaction ID */ 1736 atomic_t s_fc_subtid; 1737 1738 /* 1739 * After commit starts, the main queue gets locked, and the further 1740 * updates get added in the staging queue. 1741 */ 1742 #define FC_Q_MAIN 0 1743 #define FC_Q_STAGING 1 1744 struct list_head s_fc_q[2]; /* Inodes staged for fast commit 1745 * that have data changes in them. 1746 */ 1747 struct list_head s_fc_dentry_q[2]; /* directory entry updates */ 1748 unsigned int s_fc_bytes; 1749 /* 1750 * Main fast commit lock. This lock protects accesses to the 1751 * following fields: 1752 * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh. 1753 */ 1754 spinlock_t s_fc_lock; 1755 struct buffer_head *s_fc_bh; 1756 struct ext4_fc_stats s_fc_stats; 1757 tid_t s_fc_ineligible_tid; 1758 #ifdef CONFIG_EXT4_DEBUG 1759 int s_fc_debug_max_replay; 1760 #endif 1761 struct ext4_fc_replay_state s_fc_replay_state; 1762 }; 1763 1764 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1765 { 1766 return sb->s_fs_info; 1767 } 1768 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1769 { 1770 return container_of(inode, struct ext4_inode_info, vfs_inode); 1771 } 1772 1773 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1774 { 1775 return ino == EXT4_ROOT_INO || 1776 (ino >= EXT4_FIRST_INO(sb) && 1777 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1778 } 1779 1780 /* 1781 * Returns: sbi->field[index] 1782 * Used to access an array element from the following sbi fields which require 1783 * rcu protection to avoid dereferencing an invalid pointer due to reassignment 1784 * - s_group_desc 1785 * - s_group_info 1786 * - s_flex_group 1787 */ 1788 #define sbi_array_rcu_deref(sbi, field, index) \ 1789 ({ \ 1790 typeof(*((sbi)->field)) _v; \ 1791 rcu_read_lock(); \ 1792 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \ 1793 rcu_read_unlock(); \ 1794 _v; \ 1795 }) 1796 1797 /* 1798 * run-time mount flags 1799 */ 1800 enum { 1801 EXT4_MF_MNTDIR_SAMPLED, 1802 EXT4_MF_FS_ABORTED, /* Fatal error detected */ 1803 EXT4_MF_FC_INELIGIBLE /* Fast commit ineligible */ 1804 }; 1805 1806 static inline void ext4_set_mount_flag(struct super_block *sb, int bit) 1807 { 1808 set_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1809 } 1810 1811 static inline void ext4_clear_mount_flag(struct super_block *sb, int bit) 1812 { 1813 clear_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1814 } 1815 1816 static inline int ext4_test_mount_flag(struct super_block *sb, int bit) 1817 { 1818 return test_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1819 } 1820 1821 1822 /* 1823 * Simulate_fail codes 1824 */ 1825 #define EXT4_SIM_BBITMAP_EIO 1 1826 #define EXT4_SIM_BBITMAP_CRC 2 1827 #define EXT4_SIM_IBITMAP_EIO 3 1828 #define EXT4_SIM_IBITMAP_CRC 4 1829 #define EXT4_SIM_INODE_EIO 5 1830 #define EXT4_SIM_INODE_CRC 6 1831 #define EXT4_SIM_DIRBLOCK_EIO 7 1832 #define EXT4_SIM_DIRBLOCK_CRC 8 1833 1834 static inline bool ext4_simulate_fail(struct super_block *sb, 1835 unsigned long code) 1836 { 1837 #ifdef CONFIG_EXT4_DEBUG 1838 struct ext4_sb_info *sbi = EXT4_SB(sb); 1839 1840 if (unlikely(sbi->s_simulate_fail == code)) { 1841 sbi->s_simulate_fail = 0; 1842 return true; 1843 } 1844 #endif 1845 return false; 1846 } 1847 1848 static inline void ext4_simulate_fail_bh(struct super_block *sb, 1849 struct buffer_head *bh, 1850 unsigned long code) 1851 { 1852 if (!IS_ERR(bh) && ext4_simulate_fail(sb, code)) 1853 clear_buffer_uptodate(bh); 1854 } 1855 1856 /* 1857 * Error number codes for s_{first,last}_error_errno 1858 * 1859 * Linux errno numbers are architecture specific, so we need to translate 1860 * them into something which is architecture independent. We don't define 1861 * codes for all errno's; just the ones which are most likely to be the cause 1862 * of an ext4_error() call. 1863 */ 1864 #define EXT4_ERR_UNKNOWN 1 1865 #define EXT4_ERR_EIO 2 1866 #define EXT4_ERR_ENOMEM 3 1867 #define EXT4_ERR_EFSBADCRC 4 1868 #define EXT4_ERR_EFSCORRUPTED 5 1869 #define EXT4_ERR_ENOSPC 6 1870 #define EXT4_ERR_ENOKEY 7 1871 #define EXT4_ERR_EROFS 8 1872 #define EXT4_ERR_EFBIG 9 1873 #define EXT4_ERR_EEXIST 10 1874 #define EXT4_ERR_ERANGE 11 1875 #define EXT4_ERR_EOVERFLOW 12 1876 #define EXT4_ERR_EBUSY 13 1877 #define EXT4_ERR_ENOTDIR 14 1878 #define EXT4_ERR_ENOTEMPTY 15 1879 #define EXT4_ERR_ESHUTDOWN 16 1880 #define EXT4_ERR_EFAULT 17 1881 1882 /* 1883 * Inode dynamic state flags 1884 */ 1885 enum { 1886 EXT4_STATE_JDATA, /* journaled data exists */ 1887 EXT4_STATE_NEW, /* inode is newly created */ 1888 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1889 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1890 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1891 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1892 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1893 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1894 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1895 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */ 1896 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */ 1897 EXT4_STATE_FC_COMMITTING, /* Fast commit ongoing */ 1898 EXT4_STATE_ORPHAN_FILE, /* Inode orphaned in orphan file */ 1899 }; 1900 1901 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1902 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1903 { \ 1904 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1905 } \ 1906 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1907 { \ 1908 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1909 } \ 1910 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1911 { \ 1912 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1913 } 1914 1915 /* Add these declarations here only so that these functions can be 1916 * found by name. Otherwise, they are very hard to locate. */ 1917 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1918 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1919 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1920 EXT4_INODE_BIT_FNS(flag, flags, 0) 1921 1922 /* Add these declarations here only so that these functions can be 1923 * found by name. Otherwise, they are very hard to locate. */ 1924 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1925 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1926 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1927 #if (BITS_PER_LONG < 64) 1928 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1929 1930 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1931 { 1932 (ei)->i_state_flags = 0; 1933 } 1934 #else 1935 EXT4_INODE_BIT_FNS(state, flags, 32) 1936 1937 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1938 { 1939 /* We depend on the fact that callers will set i_flags */ 1940 } 1941 #endif 1942 #else 1943 /* Assume that user mode programs are passing in an ext4fs superblock, not 1944 * a kernel struct super_block. This will allow us to call the feature-test 1945 * macros from user land. */ 1946 #define EXT4_SB(sb) (sb) 1947 #endif 1948 1949 static inline bool ext4_verity_in_progress(struct inode *inode) 1950 { 1951 return IS_ENABLED(CONFIG_FS_VERITY) && 1952 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS); 1953 } 1954 1955 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1956 1957 /* 1958 * Codes for operating systems 1959 */ 1960 #define EXT4_OS_LINUX 0 1961 #define EXT4_OS_HURD 1 1962 #define EXT4_OS_MASIX 2 1963 #define EXT4_OS_FREEBSD 3 1964 #define EXT4_OS_LITES 4 1965 1966 /* 1967 * Revision levels 1968 */ 1969 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1970 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1971 1972 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1973 1974 #define EXT4_GOOD_OLD_INODE_SIZE 128 1975 1976 #define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN) 1977 #define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX 1978 #define EXT4_TIMESTAMP_MIN S32_MIN 1979 1980 /* 1981 * Feature set definitions 1982 */ 1983 1984 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1985 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1986 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1987 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1988 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1989 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1990 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1991 /* 1992 * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes 1993 * incompatible only if fast commit blocks are present in the FS. Since we 1994 * clear the journal (and thus the fast commit blocks), we don't mark FS as 1995 * incompatible. We also have a JBD2 incompat feature, which gets set when 1996 * there are fast commit blocks present in the journal. 1997 */ 1998 #define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400 1999 #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800 2000 #define EXT4_FEATURE_COMPAT_ORPHAN_FILE 0x1000 /* Orphan file exists */ 2001 2002 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 2003 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 2004 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 2005 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 2006 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 2007 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 2008 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 2009 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 2010 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 2011 /* 2012 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 2013 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 2014 * all other data structures' checksums. However, the METADATA_CSUM and 2015 * GDT_CSUM bits are mutually exclusive. 2016 */ 2017 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 2018 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 2019 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 2020 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000 2021 #define EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT 0x10000 /* Orphan file may be 2022 non-empty */ 2023 2024 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 2025 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 2026 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 2027 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 2028 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 2029 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 2030 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 2031 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 2032 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 2033 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 2034 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 2035 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 2036 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 2037 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 2038 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 2039 #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000 2040 2041 extern void ext4_update_dynamic_rev(struct super_block *sb); 2042 2043 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 2044 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 2045 { \ 2046 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 2047 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 2048 } \ 2049 static inline void ext4_set_feature_##name(struct super_block *sb) \ 2050 { \ 2051 ext4_update_dynamic_rev(sb); \ 2052 EXT4_SB(sb)->s_es->s_feature_compat |= \ 2053 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 2054 } \ 2055 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 2056 { \ 2057 EXT4_SB(sb)->s_es->s_feature_compat &= \ 2058 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 2059 } 2060 2061 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 2062 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 2063 { \ 2064 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 2065 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 2066 } \ 2067 static inline void ext4_set_feature_##name(struct super_block *sb) \ 2068 { \ 2069 ext4_update_dynamic_rev(sb); \ 2070 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 2071 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 2072 } \ 2073 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 2074 { \ 2075 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 2076 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 2077 } 2078 2079 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 2080 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 2081 { \ 2082 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 2083 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 2084 } \ 2085 static inline void ext4_set_feature_##name(struct super_block *sb) \ 2086 { \ 2087 ext4_update_dynamic_rev(sb); \ 2088 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 2089 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 2090 } \ 2091 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 2092 { \ 2093 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 2094 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 2095 } 2096 2097 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 2098 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 2099 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 2100 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 2101 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 2102 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 2103 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 2104 EXT4_FEATURE_COMPAT_FUNCS(fast_commit, FAST_COMMIT) 2105 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES) 2106 EXT4_FEATURE_COMPAT_FUNCS(orphan_file, ORPHAN_FILE) 2107 2108 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 2109 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 2110 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 2111 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 2112 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 2113 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 2114 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 2115 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 2116 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 2117 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 2118 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 2119 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 2120 EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY) 2121 EXT4_FEATURE_RO_COMPAT_FUNCS(orphan_present, ORPHAN_PRESENT) 2122 2123 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 2124 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 2125 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 2126 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 2127 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 2128 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 2129 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 2130 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 2131 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 2132 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 2133 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 2134 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 2135 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 2136 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 2137 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 2138 EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD) 2139 2140 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2141 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2142 EXT4_FEATURE_INCOMPAT_META_BG) 2143 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2144 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2145 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 2146 2147 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2148 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2149 EXT4_FEATURE_INCOMPAT_RECOVER| \ 2150 EXT4_FEATURE_INCOMPAT_META_BG) 2151 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2152 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2153 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 2154 2155 #define EXT4_FEATURE_COMPAT_SUPP (EXT4_FEATURE_COMPAT_EXT_ATTR| \ 2156 EXT4_FEATURE_COMPAT_ORPHAN_FILE) 2157 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2158 EXT4_FEATURE_INCOMPAT_RECOVER| \ 2159 EXT4_FEATURE_INCOMPAT_META_BG| \ 2160 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 2161 EXT4_FEATURE_INCOMPAT_64BIT| \ 2162 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 2163 EXT4_FEATURE_INCOMPAT_EA_INODE| \ 2164 EXT4_FEATURE_INCOMPAT_MMP | \ 2165 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 2166 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 2167 EXT4_FEATURE_INCOMPAT_CASEFOLD | \ 2168 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \ 2169 EXT4_FEATURE_INCOMPAT_LARGEDIR) 2170 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2171 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2172 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 2173 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 2174 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 2175 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 2176 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 2177 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 2178 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 2179 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 2180 EXT4_FEATURE_RO_COMPAT_PROJECT |\ 2181 EXT4_FEATURE_RO_COMPAT_VERITY |\ 2182 EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT) 2183 2184 #define EXTN_FEATURE_FUNCS(ver) \ 2185 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 2186 { \ 2187 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 2188 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 2189 } \ 2190 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 2191 { \ 2192 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 2193 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 2194 } \ 2195 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 2196 { \ 2197 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 2198 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 2199 } 2200 2201 EXTN_FEATURE_FUNCS(2) 2202 EXTN_FEATURE_FUNCS(3) 2203 EXTN_FEATURE_FUNCS(4) 2204 2205 static inline bool ext4_has_compat_features(struct super_block *sb) 2206 { 2207 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 2208 } 2209 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 2210 { 2211 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 2212 } 2213 static inline bool ext4_has_incompat_features(struct super_block *sb) 2214 { 2215 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 2216 } 2217 2218 extern int ext4_feature_set_ok(struct super_block *sb, int readonly); 2219 2220 /* 2221 * Superblock flags 2222 */ 2223 #define EXT4_FLAGS_RESIZING 0 2224 #define EXT4_FLAGS_SHUTDOWN 1 2225 #define EXT4_FLAGS_BDEV_IS_DAX 2 2226 2227 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi) 2228 { 2229 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 2230 } 2231 2232 /* 2233 * Default values for user and/or group using reserved blocks 2234 */ 2235 #define EXT4_DEF_RESUID 0 2236 #define EXT4_DEF_RESGID 0 2237 2238 /* 2239 * Default project ID 2240 */ 2241 #define EXT4_DEF_PROJID 0 2242 2243 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 2244 2245 /* 2246 * Default mount options 2247 */ 2248 #define EXT4_DEFM_DEBUG 0x0001 2249 #define EXT4_DEFM_BSDGROUPS 0x0002 2250 #define EXT4_DEFM_XATTR_USER 0x0004 2251 #define EXT4_DEFM_ACL 0x0008 2252 #define EXT4_DEFM_UID16 0x0010 2253 #define EXT4_DEFM_JMODE 0x0060 2254 #define EXT4_DEFM_JMODE_DATA 0x0020 2255 #define EXT4_DEFM_JMODE_ORDERED 0x0040 2256 #define EXT4_DEFM_JMODE_WBACK 0x0060 2257 #define EXT4_DEFM_NOBARRIER 0x0100 2258 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 2259 #define EXT4_DEFM_DISCARD 0x0400 2260 #define EXT4_DEFM_NODELALLOC 0x0800 2261 2262 /* 2263 * Default journal batch times 2264 */ 2265 #define EXT4_DEF_MIN_BATCH_TIME 0 2266 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 2267 2268 /* 2269 * Minimum number of groups in a flexgroup before we separate out 2270 * directories into the first block group of a flexgroup 2271 */ 2272 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 2273 2274 /* 2275 * Structure of a directory entry 2276 */ 2277 #define EXT4_NAME_LEN 255 2278 /* 2279 * Base length of the ext4 directory entry excluding the name length 2280 */ 2281 #define EXT4_BASE_DIR_LEN (sizeof(struct ext4_dir_entry_2) - EXT4_NAME_LEN) 2282 2283 struct ext4_dir_entry { 2284 __le32 inode; /* Inode number */ 2285 __le16 rec_len; /* Directory entry length */ 2286 __le16 name_len; /* Name length */ 2287 char name[EXT4_NAME_LEN]; /* File name */ 2288 }; 2289 2290 2291 /* 2292 * Encrypted Casefolded entries require saving the hash on disk. This structure 2293 * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned 2294 * boundary. 2295 */ 2296 struct ext4_dir_entry_hash { 2297 __le32 hash; 2298 __le32 minor_hash; 2299 }; 2300 2301 /* 2302 * The new version of the directory entry. Since EXT4 structures are 2303 * stored in intel byte order, and the name_len field could never be 2304 * bigger than 255 chars, it's safe to reclaim the extra byte for the 2305 * file_type field. 2306 */ 2307 struct ext4_dir_entry_2 { 2308 __le32 inode; /* Inode number */ 2309 __le16 rec_len; /* Directory entry length */ 2310 __u8 name_len; /* Name length */ 2311 __u8 file_type; /* See file type macros EXT4_FT_* below */ 2312 char name[EXT4_NAME_LEN]; /* File name */ 2313 }; 2314 2315 /* 2316 * Access the hashes at the end of ext4_dir_entry_2 2317 */ 2318 #define EXT4_DIRENT_HASHES(entry) \ 2319 ((struct ext4_dir_entry_hash *) \ 2320 (((void *)(entry)) + \ 2321 ((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND))) 2322 #define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(de)->hash) 2323 #define EXT4_DIRENT_MINOR_HASH(entry) \ 2324 le32_to_cpu(EXT4_DIRENT_HASHES(de)->minor_hash) 2325 2326 static inline bool ext4_hash_in_dirent(const struct inode *inode) 2327 { 2328 return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode); 2329 } 2330 2331 /* 2332 * This is a bogus directory entry at the end of each leaf block that 2333 * records checksums. 2334 */ 2335 struct ext4_dir_entry_tail { 2336 __le32 det_reserved_zero1; /* Pretend to be unused */ 2337 __le16 det_rec_len; /* 12 */ 2338 __u8 det_reserved_zero2; /* Zero name length */ 2339 __u8 det_reserved_ft; /* 0xDE, fake file type */ 2340 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 2341 }; 2342 2343 #define EXT4_DIRENT_TAIL(block, blocksize) \ 2344 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 2345 ((blocksize) - \ 2346 sizeof(struct ext4_dir_entry_tail)))) 2347 2348 /* 2349 * Ext4 directory file types. Only the low 3 bits are used. The 2350 * other bits are reserved for now. 2351 */ 2352 #define EXT4_FT_UNKNOWN 0 2353 #define EXT4_FT_REG_FILE 1 2354 #define EXT4_FT_DIR 2 2355 #define EXT4_FT_CHRDEV 3 2356 #define EXT4_FT_BLKDEV 4 2357 #define EXT4_FT_FIFO 5 2358 #define EXT4_FT_SOCK 6 2359 #define EXT4_FT_SYMLINK 7 2360 2361 #define EXT4_FT_MAX 8 2362 2363 #define EXT4_FT_DIR_CSUM 0xDE 2364 2365 /* 2366 * EXT4_DIR_PAD defines the directory entries boundaries 2367 * 2368 * NOTE: It must be a multiple of 4 2369 */ 2370 #define EXT4_DIR_PAD 4 2371 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 2372 #define EXT4_MAX_REC_LEN ((1<<16)-1) 2373 2374 /* 2375 * The rec_len is dependent on the type of directory. Directories that are 2376 * casefolded and encrypted need to store the hash as well, so we add room for 2377 * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should 2378 * pass NULL for dir, as those entries do not use the extra fields. 2379 */ 2380 static inline unsigned int ext4_dir_rec_len(__u8 name_len, 2381 const struct inode *dir) 2382 { 2383 int rec_len = (name_len + 8 + EXT4_DIR_ROUND); 2384 2385 if (dir && ext4_hash_in_dirent(dir)) 2386 rec_len += sizeof(struct ext4_dir_entry_hash); 2387 return (rec_len & ~EXT4_DIR_ROUND); 2388 } 2389 2390 /* 2391 * If we ever get support for fs block sizes > page_size, we'll need 2392 * to remove the #if statements in the next two functions... 2393 */ 2394 static inline unsigned int 2395 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 2396 { 2397 unsigned len = le16_to_cpu(dlen); 2398 2399 #if (PAGE_SIZE >= 65536) 2400 if (len == EXT4_MAX_REC_LEN || len == 0) 2401 return blocksize; 2402 return (len & 65532) | ((len & 3) << 16); 2403 #else 2404 return len; 2405 #endif 2406 } 2407 2408 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 2409 { 2410 BUG_ON((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)); 2411 #if (PAGE_SIZE >= 65536) 2412 if (len < 65536) 2413 return cpu_to_le16(len); 2414 if (len == blocksize) { 2415 if (blocksize == 65536) 2416 return cpu_to_le16(EXT4_MAX_REC_LEN); 2417 else 2418 return cpu_to_le16(0); 2419 } 2420 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 2421 #else 2422 return cpu_to_le16(len); 2423 #endif 2424 } 2425 2426 /* 2427 * Hash Tree Directory indexing 2428 * (c) Daniel Phillips, 2001 2429 */ 2430 2431 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2432 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2433 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \ 2434 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir))) 2435 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2436 2437 /* Legal values for the dx_root hash_version field: */ 2438 2439 #define DX_HASH_LEGACY 0 2440 #define DX_HASH_HALF_MD4 1 2441 #define DX_HASH_TEA 2 2442 #define DX_HASH_LEGACY_UNSIGNED 3 2443 #define DX_HASH_HALF_MD4_UNSIGNED 4 2444 #define DX_HASH_TEA_UNSIGNED 5 2445 #define DX_HASH_SIPHASH 6 2446 2447 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 2448 const void *address, unsigned int length) 2449 { 2450 struct { 2451 struct shash_desc shash; 2452 char ctx[4]; 2453 } desc; 2454 2455 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2456 2457 desc.shash.tfm = sbi->s_chksum_driver; 2458 *(u32 *)desc.ctx = crc; 2459 2460 BUG_ON(crypto_shash_update(&desc.shash, address, length)); 2461 2462 return *(u32 *)desc.ctx; 2463 } 2464 2465 #ifdef __KERNEL__ 2466 2467 /* hash info structure used by the directory hash */ 2468 struct dx_hash_info 2469 { 2470 u32 hash; 2471 u32 minor_hash; 2472 int hash_version; 2473 u32 *seed; 2474 }; 2475 2476 2477 /* 32 and 64 bit signed EOF for dx directories */ 2478 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2479 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2480 2481 2482 /* 2483 * Control parameters used by ext4_htree_next_block 2484 */ 2485 #define HASH_NB_ALWAYS 1 2486 2487 struct ext4_filename { 2488 const struct qstr *usr_fname; 2489 struct fscrypt_str disk_name; 2490 struct dx_hash_info hinfo; 2491 #ifdef CONFIG_FS_ENCRYPTION 2492 struct fscrypt_str crypto_buf; 2493 #endif 2494 #if IS_ENABLED(CONFIG_UNICODE) 2495 struct fscrypt_str cf_name; 2496 #endif 2497 }; 2498 2499 #define fname_name(p) ((p)->disk_name.name) 2500 #define fname_usr_name(p) ((p)->usr_fname->name) 2501 #define fname_len(p) ((p)->disk_name.len) 2502 2503 /* 2504 * Describe an inode's exact location on disk and in memory 2505 */ 2506 struct ext4_iloc 2507 { 2508 struct buffer_head *bh; 2509 unsigned long offset; 2510 ext4_group_t block_group; 2511 }; 2512 2513 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2514 { 2515 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2516 } 2517 2518 static inline bool ext4_is_quota_file(struct inode *inode) 2519 { 2520 return IS_NOQUOTA(inode) && 2521 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL); 2522 } 2523 2524 /* 2525 * This structure is stuffed into the struct file's private_data field 2526 * for directories. It is where we put information so that we can do 2527 * readdir operations in hash tree order. 2528 */ 2529 struct dir_private_info { 2530 struct rb_root root; 2531 struct rb_node *curr_node; 2532 struct fname *extra_fname; 2533 loff_t last_pos; 2534 __u32 curr_hash; 2535 __u32 curr_minor_hash; 2536 __u32 next_hash; 2537 }; 2538 2539 /* calculate the first block number of the group */ 2540 static inline ext4_fsblk_t 2541 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2542 { 2543 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2544 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2545 } 2546 2547 /* 2548 * Special error return code only used by dx_probe() and its callers. 2549 */ 2550 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2551 2552 /* htree levels for ext4 */ 2553 #define EXT4_HTREE_LEVEL_COMPAT 2 2554 #define EXT4_HTREE_LEVEL 3 2555 2556 static inline int ext4_dir_htree_level(struct super_block *sb) 2557 { 2558 return ext4_has_feature_largedir(sb) ? 2559 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT; 2560 } 2561 2562 /* 2563 * Timeout and state flag for lazy initialization inode thread. 2564 */ 2565 #define EXT4_DEF_LI_WAIT_MULT 10 2566 #define EXT4_DEF_LI_MAX_START_DELAY 5 2567 #define EXT4_LAZYINIT_QUIT 0x0001 2568 #define EXT4_LAZYINIT_RUNNING 0x0002 2569 2570 /* 2571 * Lazy inode table initialization info 2572 */ 2573 struct ext4_lazy_init { 2574 unsigned long li_state; 2575 struct list_head li_request_list; 2576 struct mutex li_list_mtx; 2577 }; 2578 2579 enum ext4_li_mode { 2580 EXT4_LI_MODE_PREFETCH_BBITMAP, 2581 EXT4_LI_MODE_ITABLE, 2582 }; 2583 2584 struct ext4_li_request { 2585 struct super_block *lr_super; 2586 enum ext4_li_mode lr_mode; 2587 ext4_group_t lr_first_not_zeroed; 2588 ext4_group_t lr_next_group; 2589 struct list_head lr_request; 2590 unsigned long lr_next_sched; 2591 unsigned long lr_timeout; 2592 }; 2593 2594 struct ext4_features { 2595 struct kobject f_kobj; 2596 struct completion f_kobj_unregister; 2597 }; 2598 2599 /* 2600 * This structure will be used for multiple mount protection. It will be 2601 * written into the block number saved in the s_mmp_block field in the 2602 * superblock. Programs that check MMP should assume that if 2603 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2604 * to use the filesystem, regardless of how old the timestamp is. 2605 */ 2606 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2607 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2608 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2609 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2610 2611 struct mmp_struct { 2612 __le32 mmp_magic; /* Magic number for MMP */ 2613 __le32 mmp_seq; /* Sequence no. updated periodically */ 2614 2615 /* 2616 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2617 * purposes and do not affect the correctness of the algorithm 2618 */ 2619 __le64 mmp_time; /* Time last updated */ 2620 char mmp_nodename[64]; /* Node which last updated MMP block */ 2621 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2622 2623 /* 2624 * mmp_check_interval is used to verify if the MMP block has been 2625 * updated on the block device. The value is updated based on the 2626 * maximum time to write the MMP block during an update cycle. 2627 */ 2628 __le16 mmp_check_interval; 2629 2630 __le16 mmp_pad1; 2631 __le32 mmp_pad2[226]; 2632 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2633 }; 2634 2635 /* arguments passed to the mmp thread */ 2636 struct mmpd_data { 2637 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2638 struct super_block *sb; /* super block of the fs */ 2639 }; 2640 2641 /* 2642 * Check interval multiplier 2643 * The MMP block is written every update interval and initially checked every 2644 * update interval x the multiplier (the value is then adapted based on the 2645 * write latency). The reason is that writes can be delayed under load and we 2646 * don't want readers to incorrectly assume that the filesystem is no longer 2647 * in use. 2648 */ 2649 #define EXT4_MMP_CHECK_MULT 2UL 2650 2651 /* 2652 * Minimum interval for MMP checking in seconds. 2653 */ 2654 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2655 2656 /* 2657 * Maximum interval for MMP checking in seconds. 2658 */ 2659 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2660 2661 /* 2662 * Function prototypes 2663 */ 2664 2665 /* 2666 * Ok, these declarations are also in <linux/kernel.h> but none of the 2667 * ext4 source programs needs to include it so they are duplicated here. 2668 */ 2669 # define NORET_TYPE /**/ 2670 # define ATTRIB_NORET __attribute__((noreturn)) 2671 # define NORET_AND noreturn, 2672 2673 /* bitmap.c */ 2674 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2675 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2676 struct ext4_group_desc *gdp, 2677 struct buffer_head *bh, int sz); 2678 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2679 struct ext4_group_desc *gdp, 2680 struct buffer_head *bh, int sz); 2681 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2682 struct ext4_group_desc *gdp, 2683 struct buffer_head *bh); 2684 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2685 struct ext4_group_desc *gdp, 2686 struct buffer_head *bh); 2687 2688 /* balloc.c */ 2689 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2690 ext4_fsblk_t blocknr, 2691 ext4_group_t *blockgrpp, 2692 ext4_grpblk_t *offsetp); 2693 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2694 ext4_fsblk_t block); 2695 2696 extern unsigned int ext4_block_group(struct super_block *sb, 2697 ext4_fsblk_t blocknr); 2698 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2699 ext4_fsblk_t blocknr); 2700 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2701 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2702 ext4_group_t group); 2703 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2704 ext4_fsblk_t goal, 2705 unsigned int flags, 2706 unsigned long *count, 2707 int *errp); 2708 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2709 s64 nclusters, unsigned int flags); 2710 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2711 extern void ext4_check_blocks_bitmap(struct super_block *); 2712 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2713 ext4_group_t block_group, 2714 struct buffer_head ** bh); 2715 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2716 2717 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2718 ext4_group_t block_group, 2719 bool ignore_locked); 2720 extern int ext4_wait_block_bitmap(struct super_block *sb, 2721 ext4_group_t block_group, 2722 struct buffer_head *bh); 2723 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2724 ext4_group_t block_group); 2725 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2726 ext4_group_t block_group, 2727 struct ext4_group_desc *gdp); 2728 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2729 2730 #if IS_ENABLED(CONFIG_UNICODE) 2731 extern int ext4_fname_setup_ci_filename(struct inode *dir, 2732 const struct qstr *iname, 2733 struct ext4_filename *fname); 2734 #endif 2735 2736 /* ext4 encryption related stuff goes here crypto.c */ 2737 #ifdef CONFIG_FS_ENCRYPTION 2738 extern const struct fscrypt_operations ext4_cryptops; 2739 2740 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst, 2741 const struct fscrypt_name *src) 2742 { 2743 memset(dst, 0, sizeof(*dst)); 2744 2745 dst->usr_fname = src->usr_fname; 2746 dst->disk_name = src->disk_name; 2747 dst->hinfo.hash = src->hash; 2748 dst->hinfo.minor_hash = src->minor_hash; 2749 dst->crypto_buf = src->crypto_buf; 2750 } 2751 2752 static inline int ext4_fname_setup_filename(struct inode *dir, 2753 const struct qstr *iname, 2754 int lookup, 2755 struct ext4_filename *fname) 2756 { 2757 struct fscrypt_name name; 2758 int err; 2759 2760 err = fscrypt_setup_filename(dir, iname, lookup, &name); 2761 if (err) 2762 return err; 2763 2764 ext4_fname_from_fscrypt_name(fname, &name); 2765 2766 #if IS_ENABLED(CONFIG_UNICODE) 2767 err = ext4_fname_setup_ci_filename(dir, iname, fname); 2768 #endif 2769 return err; 2770 } 2771 2772 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2773 struct dentry *dentry, 2774 struct ext4_filename *fname) 2775 { 2776 struct fscrypt_name name; 2777 int err; 2778 2779 err = fscrypt_prepare_lookup(dir, dentry, &name); 2780 if (err) 2781 return err; 2782 2783 ext4_fname_from_fscrypt_name(fname, &name); 2784 2785 #if IS_ENABLED(CONFIG_UNICODE) 2786 err = ext4_fname_setup_ci_filename(dir, &dentry->d_name, fname); 2787 #endif 2788 return err; 2789 } 2790 2791 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2792 { 2793 struct fscrypt_name name; 2794 2795 name.crypto_buf = fname->crypto_buf; 2796 fscrypt_free_filename(&name); 2797 2798 fname->crypto_buf.name = NULL; 2799 fname->usr_fname = NULL; 2800 fname->disk_name.name = NULL; 2801 2802 #if IS_ENABLED(CONFIG_UNICODE) 2803 kfree(fname->cf_name.name); 2804 fname->cf_name.name = NULL; 2805 #endif 2806 } 2807 #else /* !CONFIG_FS_ENCRYPTION */ 2808 static inline int ext4_fname_setup_filename(struct inode *dir, 2809 const struct qstr *iname, 2810 int lookup, 2811 struct ext4_filename *fname) 2812 { 2813 int err = 0; 2814 fname->usr_fname = iname; 2815 fname->disk_name.name = (unsigned char *) iname->name; 2816 fname->disk_name.len = iname->len; 2817 2818 #if IS_ENABLED(CONFIG_UNICODE) 2819 err = ext4_fname_setup_ci_filename(dir, iname, fname); 2820 #endif 2821 2822 return err; 2823 } 2824 2825 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2826 struct dentry *dentry, 2827 struct ext4_filename *fname) 2828 { 2829 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname); 2830 } 2831 2832 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2833 { 2834 #if IS_ENABLED(CONFIG_UNICODE) 2835 kfree(fname->cf_name.name); 2836 fname->cf_name.name = NULL; 2837 #endif 2838 } 2839 #endif /* !CONFIG_FS_ENCRYPTION */ 2840 2841 /* dir.c */ 2842 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2843 struct file *, 2844 struct ext4_dir_entry_2 *, 2845 struct buffer_head *, char *, int, 2846 unsigned int); 2847 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2848 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2849 (de), (bh), (buf), (size), (offset))) 2850 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2851 __u32 minor_hash, 2852 struct ext4_dir_entry_2 *dirent, 2853 struct fscrypt_str *ent_name); 2854 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2855 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2856 struct buffer_head *bh, 2857 void *buf, int buf_size, 2858 struct ext4_filename *fname, 2859 struct ext4_dir_entry_2 **dest_de); 2860 void ext4_insert_dentry(struct inode *dir, struct inode *inode, 2861 struct ext4_dir_entry_2 *de, 2862 int buf_size, 2863 struct ext4_filename *fname); 2864 static inline void ext4_update_dx_flag(struct inode *inode) 2865 { 2866 if (!ext4_has_feature_dir_index(inode->i_sb) && 2867 ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) { 2868 /* ext4_iget() should have caught this... */ 2869 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb)); 2870 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2871 } 2872 } 2873 static const unsigned char ext4_filetype_table[] = { 2874 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2875 }; 2876 2877 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2878 { 2879 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2880 return DT_UNKNOWN; 2881 2882 return ext4_filetype_table[filetype]; 2883 } 2884 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2885 void *buf, int buf_size); 2886 2887 /* fsync.c */ 2888 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2889 2890 /* hash.c */ 2891 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len, 2892 struct dx_hash_info *hinfo); 2893 2894 /* ialloc.c */ 2895 extern int ext4_mark_inode_used(struct super_block *sb, int ino); 2896 extern struct inode *__ext4_new_inode(struct user_namespace *, handle_t *, 2897 struct inode *, umode_t, 2898 const struct qstr *qstr, __u32 goal, 2899 uid_t *owner, __u32 i_flags, 2900 int handle_type, unsigned int line_no, 2901 int nblocks); 2902 2903 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \ 2904 __ext4_new_inode(&init_user_ns, (handle), (dir), (mode), (qstr), \ 2905 (goal), (owner), i_flags, 0, 0, 0) 2906 #define ext4_new_inode_start_handle(mnt_userns, dir, mode, qstr, goal, owner, \ 2907 type, nblocks) \ 2908 __ext4_new_inode((mnt_userns), NULL, (dir), (mode), (qstr), (goal), (owner), \ 2909 0, (type), __LINE__, (nblocks)) 2910 2911 2912 extern void ext4_free_inode(handle_t *, struct inode *); 2913 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2914 extern unsigned long ext4_count_free_inodes(struct super_block *); 2915 extern unsigned long ext4_count_dirs(struct super_block *); 2916 extern void ext4_check_inodes_bitmap(struct super_block *); 2917 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2918 extern int ext4_init_inode_table(struct super_block *sb, 2919 ext4_group_t group, int barrier); 2920 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2921 2922 /* fast_commit.c */ 2923 int ext4_fc_info_show(struct seq_file *seq, void *v); 2924 void ext4_fc_init(struct super_block *sb, journal_t *journal); 2925 void ext4_fc_init_inode(struct inode *inode); 2926 void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start, 2927 ext4_lblk_t end); 2928 void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode, 2929 struct dentry *dentry); 2930 void __ext4_fc_track_link(handle_t *handle, struct inode *inode, 2931 struct dentry *dentry); 2932 void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry); 2933 void ext4_fc_track_link(handle_t *handle, struct dentry *dentry); 2934 void __ext4_fc_track_create(handle_t *handle, struct inode *inode, 2935 struct dentry *dentry); 2936 void ext4_fc_track_create(handle_t *handle, struct dentry *dentry); 2937 void ext4_fc_track_inode(handle_t *handle, struct inode *inode); 2938 void ext4_fc_mark_ineligible(struct super_block *sb, int reason, handle_t *handle); 2939 void ext4_fc_start_update(struct inode *inode); 2940 void ext4_fc_stop_update(struct inode *inode); 2941 void ext4_fc_del(struct inode *inode); 2942 bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block); 2943 void ext4_fc_replay_cleanup(struct super_block *sb); 2944 int ext4_fc_commit(journal_t *journal, tid_t commit_tid); 2945 int __init ext4_fc_init_dentry_cache(void); 2946 void ext4_fc_destroy_dentry_cache(void); 2947 int ext4_fc_record_regions(struct super_block *sb, int ino, 2948 ext4_lblk_t lblk, ext4_fsblk_t pblk, 2949 int len, int replay); 2950 2951 /* mballoc.c */ 2952 extern const struct seq_operations ext4_mb_seq_groups_ops; 2953 extern const struct seq_operations ext4_mb_seq_structs_summary_ops; 2954 extern long ext4_mb_stats; 2955 extern long ext4_mb_max_to_scan; 2956 extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset); 2957 extern int ext4_mb_init(struct super_block *); 2958 extern int ext4_mb_release(struct super_block *); 2959 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2960 struct ext4_allocation_request *, int *); 2961 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2962 extern void ext4_discard_preallocations(struct inode *, unsigned int); 2963 extern int __init ext4_init_mballoc(void); 2964 extern void ext4_exit_mballoc(void); 2965 extern ext4_group_t ext4_mb_prefetch(struct super_block *sb, 2966 ext4_group_t group, 2967 unsigned int nr, int *cnt); 2968 extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group, 2969 unsigned int nr); 2970 2971 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2972 struct buffer_head *bh, ext4_fsblk_t block, 2973 unsigned long count, int flags); 2974 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2975 ext4_group_t ngroups); 2976 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2977 ext4_group_t i, struct ext4_group_desc *desc); 2978 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2979 ext4_fsblk_t block, unsigned long count); 2980 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2981 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid); 2982 extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block, 2983 int len, int state); 2984 2985 /* inode.c */ 2986 void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw, 2987 struct ext4_inode_info *ei); 2988 int ext4_inode_is_fast_symlink(struct inode *inode); 2989 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2990 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2991 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count, 2992 bool wait, struct buffer_head **bhs); 2993 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2994 struct buffer_head *bh_result, int create); 2995 int ext4_get_block(struct inode *inode, sector_t iblock, 2996 struct buffer_head *bh_result, int create); 2997 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2998 struct buffer_head *bh, int create); 2999 int ext4_walk_page_buffers(handle_t *handle, 3000 struct inode *inode, 3001 struct buffer_head *head, 3002 unsigned from, 3003 unsigned to, 3004 int *partial, 3005 int (*fn)(handle_t *handle, struct inode *inode, 3006 struct buffer_head *bh)); 3007 int do_journal_get_write_access(handle_t *handle, struct inode *inode, 3008 struct buffer_head *bh); 3009 #define FALL_BACK_TO_NONDELALLOC 1 3010 #define CONVERT_INLINE_DATA 2 3011 3012 typedef enum { 3013 EXT4_IGET_NORMAL = 0, 3014 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */ 3015 EXT4_IGET_HANDLE = 0x0002 /* Inode # is from a handle */ 3016 } ext4_iget_flags; 3017 3018 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, 3019 ext4_iget_flags flags, const char *function, 3020 unsigned int line); 3021 3022 #define ext4_iget(sb, ino, flags) \ 3023 __ext4_iget((sb), (ino), (flags), __func__, __LINE__) 3024 3025 extern int ext4_write_inode(struct inode *, struct writeback_control *); 3026 extern int ext4_setattr(struct user_namespace *, struct dentry *, 3027 struct iattr *); 3028 extern int ext4_getattr(struct user_namespace *, const struct path *, 3029 struct kstat *, u32, unsigned int); 3030 extern void ext4_evict_inode(struct inode *); 3031 extern void ext4_clear_inode(struct inode *); 3032 extern int ext4_file_getattr(struct user_namespace *, const struct path *, 3033 struct kstat *, u32, unsigned int); 3034 extern int ext4_sync_inode(handle_t *, struct inode *); 3035 extern void ext4_dirty_inode(struct inode *, int); 3036 extern int ext4_change_inode_journal_flag(struct inode *, int); 3037 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 3038 extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino, 3039 struct ext4_iloc *iloc); 3040 extern int ext4_inode_attach_jinode(struct inode *inode); 3041 extern int ext4_can_truncate(struct inode *inode); 3042 extern int ext4_truncate(struct inode *); 3043 extern int ext4_break_layouts(struct inode *); 3044 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length); 3045 extern void ext4_set_inode_flags(struct inode *, bool init); 3046 extern int ext4_alloc_da_blocks(struct inode *inode); 3047 extern void ext4_set_aops(struct inode *inode); 3048 extern int ext4_writepage_trans_blocks(struct inode *); 3049 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 3050 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 3051 loff_t lstart, loff_t lend); 3052 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf); 3053 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 3054 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 3055 extern void ext4_da_release_space(struct inode *inode, int to_free); 3056 extern void ext4_da_update_reserve_space(struct inode *inode, 3057 int used, int quota_claim); 3058 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 3059 ext4_fsblk_t pblk, ext4_lblk_t len); 3060 3061 /* indirect.c */ 3062 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 3063 struct ext4_map_blocks *map, int flags); 3064 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 3065 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 3066 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 3067 ext4_lblk_t start, ext4_lblk_t end); 3068 3069 /* ioctl.c */ 3070 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 3071 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 3072 int ext4_fileattr_set(struct user_namespace *mnt_userns, 3073 struct dentry *dentry, struct fileattr *fa); 3074 int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa); 3075 extern void ext4_reset_inode_seed(struct inode *inode); 3076 int ext4_update_overhead(struct super_block *sb); 3077 3078 /* migrate.c */ 3079 extern int ext4_ext_migrate(struct inode *); 3080 extern int ext4_ind_migrate(struct inode *inode); 3081 3082 /* namei.c */ 3083 extern int ext4_init_new_dir(handle_t *handle, struct inode *dir, 3084 struct inode *inode); 3085 extern int ext4_dirblock_csum_verify(struct inode *inode, 3086 struct buffer_head *bh); 3087 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 3088 __u32 start_minor_hash, __u32 *next_hash); 3089 extern int ext4_search_dir(struct buffer_head *bh, 3090 char *search_buf, 3091 int buf_size, 3092 struct inode *dir, 3093 struct ext4_filename *fname, 3094 unsigned int offset, 3095 struct ext4_dir_entry_2 **res_dir); 3096 extern int ext4_generic_delete_entry(struct inode *dir, 3097 struct ext4_dir_entry_2 *de_del, 3098 struct buffer_head *bh, 3099 void *entry_buf, 3100 int buf_size, 3101 int csum_size); 3102 extern bool ext4_empty_dir(struct inode *inode); 3103 3104 /* resize.c */ 3105 extern void ext4_kvfree_array_rcu(void *to_free); 3106 extern int ext4_group_add(struct super_block *sb, 3107 struct ext4_new_group_data *input); 3108 extern int ext4_group_extend(struct super_block *sb, 3109 struct ext4_super_block *es, 3110 ext4_fsblk_t n_blocks_count); 3111 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 3112 extern unsigned int ext4_list_backups(struct super_block *sb, 3113 unsigned int *three, unsigned int *five, 3114 unsigned int *seven); 3115 3116 /* super.c */ 3117 extern struct buffer_head *ext4_sb_bread(struct super_block *sb, 3118 sector_t block, int op_flags); 3119 extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb, 3120 sector_t block); 3121 extern void ext4_read_bh_nowait(struct buffer_head *bh, int op_flags, 3122 bh_end_io_t *end_io); 3123 extern int ext4_read_bh(struct buffer_head *bh, int op_flags, 3124 bh_end_io_t *end_io); 3125 extern int ext4_read_bh_lock(struct buffer_head *bh, int op_flags, bool wait); 3126 extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block); 3127 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 3128 extern int ext4_calculate_overhead(struct super_block *sb); 3129 extern __le32 ext4_superblock_csum(struct super_block *sb, 3130 struct ext4_super_block *es); 3131 extern void ext4_superblock_csum_set(struct super_block *sb); 3132 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 3133 ext4_group_t ngroup); 3134 extern const char *ext4_decode_error(struct super_block *sb, int errno, 3135 char nbuf[16]); 3136 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb, 3137 ext4_group_t block_group, 3138 unsigned int flags); 3139 3140 extern __printf(7, 8) 3141 void __ext4_error(struct super_block *, const char *, unsigned int, bool, 3142 int, __u64, const char *, ...); 3143 extern __printf(6, 7) 3144 void __ext4_error_inode(struct inode *, const char *, unsigned int, 3145 ext4_fsblk_t, int, const char *, ...); 3146 extern __printf(5, 6) 3147 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 3148 const char *, ...); 3149 extern void __ext4_std_error(struct super_block *, const char *, 3150 unsigned int, int); 3151 extern __printf(4, 5) 3152 void __ext4_warning(struct super_block *, const char *, unsigned int, 3153 const char *, ...); 3154 extern __printf(4, 5) 3155 void __ext4_warning_inode(const struct inode *inode, const char *function, 3156 unsigned int line, const char *fmt, ...); 3157 extern __printf(3, 4) 3158 void __ext4_msg(struct super_block *, const char *, const char *, ...); 3159 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 3160 const char *, unsigned int, const char *); 3161 extern __printf(7, 8) 3162 void __ext4_grp_locked_error(const char *, unsigned int, 3163 struct super_block *, ext4_group_t, 3164 unsigned long, ext4_fsblk_t, 3165 const char *, ...); 3166 3167 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 3168 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 3169 3170 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \ 3171 __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a) 3172 3173 #define ext4_error_inode_block(inode, block, err, fmt, a...) \ 3174 __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \ 3175 (fmt), ## a) 3176 3177 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 3178 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 3179 3180 #define ext4_abort(sb, err, fmt, a...) \ 3181 __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a) 3182 3183 #ifdef CONFIG_PRINTK 3184 3185 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 3186 __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__) 3187 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 3188 __ext4_error_inode((inode), (func), (line), (block), \ 3189 (err), (fmt), ##__VA_ARGS__) 3190 #define ext4_error_file(file, func, line, block, fmt, ...) \ 3191 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 3192 #define ext4_error(sb, fmt, ...) \ 3193 __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt), \ 3194 ##__VA_ARGS__) 3195 #define ext4_error_err(sb, err, fmt, ...) \ 3196 __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt), \ 3197 ##__VA_ARGS__) 3198 #define ext4_warning(sb, fmt, ...) \ 3199 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 3200 #define ext4_warning_inode(inode, fmt, ...) \ 3201 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 3202 #define ext4_msg(sb, level, fmt, ...) \ 3203 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 3204 #define dump_mmp_msg(sb, mmp, msg) \ 3205 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 3206 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 3207 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 3208 fmt, ##__VA_ARGS__) 3209 3210 #else 3211 3212 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 3213 do { \ 3214 no_printk(fmt, ##__VA_ARGS__); \ 3215 __ext4_error_inode(inode, "", 0, block, 0, " "); \ 3216 } while (0) 3217 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 3218 do { \ 3219 no_printk(fmt, ##__VA_ARGS__); \ 3220 __ext4_error_inode(inode, "", 0, block, err, " "); \ 3221 } while (0) 3222 #define ext4_error_file(file, func, line, block, fmt, ...) \ 3223 do { \ 3224 no_printk(fmt, ##__VA_ARGS__); \ 3225 __ext4_error_file(file, "", 0, block, " "); \ 3226 } while (0) 3227 #define ext4_error(sb, fmt, ...) \ 3228 do { \ 3229 no_printk(fmt, ##__VA_ARGS__); \ 3230 __ext4_error(sb, "", 0, false, 0, 0, " "); \ 3231 } while (0) 3232 #define ext4_error_err(sb, err, fmt, ...) \ 3233 do { \ 3234 no_printk(fmt, ##__VA_ARGS__); \ 3235 __ext4_error(sb, "", 0, false, err, 0, " "); \ 3236 } while (0) 3237 #define ext4_warning(sb, fmt, ...) \ 3238 do { \ 3239 no_printk(fmt, ##__VA_ARGS__); \ 3240 __ext4_warning(sb, "", 0, " "); \ 3241 } while (0) 3242 #define ext4_warning_inode(inode, fmt, ...) \ 3243 do { \ 3244 no_printk(fmt, ##__VA_ARGS__); \ 3245 __ext4_warning_inode(inode, "", 0, " "); \ 3246 } while (0) 3247 #define ext4_msg(sb, level, fmt, ...) \ 3248 do { \ 3249 no_printk(fmt, ##__VA_ARGS__); \ 3250 __ext4_msg(sb, "", " "); \ 3251 } while (0) 3252 #define dump_mmp_msg(sb, mmp, msg) \ 3253 __dump_mmp_msg(sb, mmp, "", 0, "") 3254 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 3255 do { \ 3256 no_printk(fmt, ##__VA_ARGS__); \ 3257 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 3258 } while (0) 3259 3260 #endif 3261 3262 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 3263 struct ext4_group_desc *bg); 3264 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 3265 struct ext4_group_desc *bg); 3266 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 3267 struct ext4_group_desc *bg); 3268 extern __u32 ext4_free_group_clusters(struct super_block *sb, 3269 struct ext4_group_desc *bg); 3270 extern __u32 ext4_free_inodes_count(struct super_block *sb, 3271 struct ext4_group_desc *bg); 3272 extern __u32 ext4_used_dirs_count(struct super_block *sb, 3273 struct ext4_group_desc *bg); 3274 extern __u32 ext4_itable_unused_count(struct super_block *sb, 3275 struct ext4_group_desc *bg); 3276 extern void ext4_block_bitmap_set(struct super_block *sb, 3277 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3278 extern void ext4_inode_bitmap_set(struct super_block *sb, 3279 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3280 extern void ext4_inode_table_set(struct super_block *sb, 3281 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3282 extern void ext4_free_group_clusters_set(struct super_block *sb, 3283 struct ext4_group_desc *bg, 3284 __u32 count); 3285 extern void ext4_free_inodes_set(struct super_block *sb, 3286 struct ext4_group_desc *bg, __u32 count); 3287 extern void ext4_used_dirs_set(struct super_block *sb, 3288 struct ext4_group_desc *bg, __u32 count); 3289 extern void ext4_itable_unused_set(struct super_block *sb, 3290 struct ext4_group_desc *bg, __u32 count); 3291 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 3292 struct ext4_group_desc *gdp); 3293 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 3294 struct ext4_group_desc *gdp); 3295 extern int ext4_register_li_request(struct super_block *sb, 3296 ext4_group_t first_not_zeroed); 3297 3298 static inline int ext4_has_metadata_csum(struct super_block *sb) 3299 { 3300 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 3301 !EXT4_SB(sb)->s_chksum_driver); 3302 3303 return ext4_has_feature_metadata_csum(sb) && 3304 (EXT4_SB(sb)->s_chksum_driver != NULL); 3305 } 3306 3307 static inline int ext4_has_group_desc_csum(struct super_block *sb) 3308 { 3309 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb); 3310 } 3311 3312 #define ext4_read_incompat_64bit_val(es, name) \ 3313 (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \ 3314 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \ 3315 le32_to_cpu(es->name##_lo)) 3316 3317 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 3318 { 3319 return ext4_read_incompat_64bit_val(es, s_blocks_count); 3320 } 3321 3322 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 3323 { 3324 return ext4_read_incompat_64bit_val(es, s_r_blocks_count); 3325 } 3326 3327 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 3328 { 3329 return ext4_read_incompat_64bit_val(es, s_free_blocks_count); 3330 } 3331 3332 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 3333 ext4_fsblk_t blk) 3334 { 3335 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 3336 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 3337 } 3338 3339 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 3340 ext4_fsblk_t blk) 3341 { 3342 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 3343 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 3344 } 3345 3346 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 3347 ext4_fsblk_t blk) 3348 { 3349 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 3350 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 3351 } 3352 3353 static inline loff_t ext4_isize(struct super_block *sb, 3354 struct ext4_inode *raw_inode) 3355 { 3356 if (ext4_has_feature_largedir(sb) || 3357 S_ISREG(le16_to_cpu(raw_inode->i_mode))) 3358 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 3359 le32_to_cpu(raw_inode->i_size_lo); 3360 3361 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 3362 } 3363 3364 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 3365 { 3366 raw_inode->i_size_lo = cpu_to_le32(i_size); 3367 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 3368 } 3369 3370 static inline 3371 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 3372 ext4_group_t group) 3373 { 3374 struct ext4_group_info **grp_info; 3375 long indexv, indexh; 3376 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 3377 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 3378 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 3379 grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv); 3380 return grp_info[indexh]; 3381 } 3382 3383 /* 3384 * Reading s_groups_count requires using smp_rmb() afterwards. See 3385 * the locking protocol documented in the comments of ext4_group_add() 3386 * in resize.c 3387 */ 3388 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 3389 { 3390 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 3391 3392 smp_rmb(); 3393 return ngroups; 3394 } 3395 3396 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 3397 ext4_group_t block_group) 3398 { 3399 return block_group >> sbi->s_log_groups_per_flex; 3400 } 3401 3402 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 3403 { 3404 return 1 << sbi->s_log_groups_per_flex; 3405 } 3406 3407 #define ext4_std_error(sb, errno) \ 3408 do { \ 3409 if ((errno)) \ 3410 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 3411 } while (0) 3412 3413 #ifdef CONFIG_SMP 3414 /* Each CPU can accumulate percpu_counter_batch clusters in their local 3415 * counters. So we need to make sure we have free clusters more 3416 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 3417 */ 3418 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 3419 #else 3420 #define EXT4_FREECLUSTERS_WATERMARK 0 3421 #endif 3422 3423 /* Update i_disksize. Requires i_rwsem to avoid races with truncate */ 3424 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 3425 { 3426 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 3427 !inode_is_locked(inode)); 3428 down_write(&EXT4_I(inode)->i_data_sem); 3429 if (newsize > EXT4_I(inode)->i_disksize) 3430 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize); 3431 up_write(&EXT4_I(inode)->i_data_sem); 3432 } 3433 3434 /* Update i_size, i_disksize. Requires i_rwsem to avoid races with truncate */ 3435 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 3436 { 3437 int changed = 0; 3438 3439 if (newsize > inode->i_size) { 3440 i_size_write(inode, newsize); 3441 changed = 1; 3442 } 3443 if (newsize > EXT4_I(inode)->i_disksize) { 3444 ext4_update_i_disksize(inode, newsize); 3445 changed |= 2; 3446 } 3447 return changed; 3448 } 3449 3450 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 3451 loff_t len); 3452 3453 struct ext4_group_info { 3454 unsigned long bb_state; 3455 #ifdef AGGRESSIVE_CHECK 3456 unsigned long bb_check_counter; 3457 #endif 3458 struct rb_root bb_free_root; 3459 ext4_grpblk_t bb_first_free; /* first free block */ 3460 ext4_grpblk_t bb_free; /* total free blocks */ 3461 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 3462 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 3463 ext4_group_t bb_group; /* Group number */ 3464 struct list_head bb_prealloc_list; 3465 #ifdef DOUBLE_CHECK 3466 void *bb_bitmap; 3467 #endif 3468 struct rw_semaphore alloc_sem; 3469 struct rb_node bb_avg_fragment_size_rb; 3470 struct list_head bb_largest_free_order_node; 3471 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 3472 * regions, index is order. 3473 * bb_counters[3] = 5 means 3474 * 5 free 8-block regions. */ 3475 }; 3476 3477 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 3478 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 3479 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 3480 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 3481 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \ 3482 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT) 3483 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \ 3484 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT) 3485 #define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4 3486 3487 #define EXT4_MB_GRP_NEED_INIT(grp) \ 3488 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 3489 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 3490 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3491 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 3492 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3493 3494 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 3495 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3496 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 3497 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3498 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 3499 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3500 #define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \ 3501 (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state))) 3502 3503 #define EXT4_MAX_CONTENTION 8 3504 #define EXT4_CONTENTION_THRESHOLD 2 3505 3506 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 3507 ext4_group_t group) 3508 { 3509 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 3510 } 3511 3512 /* 3513 * Returns true if the filesystem is busy enough that attempts to 3514 * access the block group locks has run into contention. 3515 */ 3516 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 3517 { 3518 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 3519 } 3520 3521 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 3522 { 3523 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 3524 if (spin_trylock(lock)) 3525 /* 3526 * We're able to grab the lock right away, so drop the 3527 * lock contention counter. 3528 */ 3529 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 3530 else { 3531 /* 3532 * The lock is busy, so bump the contention counter, 3533 * and then wait on the spin lock. 3534 */ 3535 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 3536 EXT4_MAX_CONTENTION); 3537 spin_lock(lock); 3538 } 3539 } 3540 3541 static inline void ext4_unlock_group(struct super_block *sb, 3542 ext4_group_t group) 3543 { 3544 spin_unlock(ext4_group_lock_ptr(sb, group)); 3545 } 3546 3547 #ifdef CONFIG_QUOTA 3548 static inline bool ext4_quota_capable(struct super_block *sb) 3549 { 3550 return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb)); 3551 } 3552 3553 static inline bool ext4_is_quota_journalled(struct super_block *sb) 3554 { 3555 struct ext4_sb_info *sbi = EXT4_SB(sb); 3556 3557 return (ext4_has_feature_quota(sb) || 3558 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]); 3559 } 3560 int ext4_enable_quotas(struct super_block *sb); 3561 #endif 3562 3563 /* 3564 * Block validity checking 3565 */ 3566 #define ext4_check_indirect_blockref(inode, bh) \ 3567 ext4_check_blockref(__func__, __LINE__, inode, \ 3568 (__le32 *)(bh)->b_data, \ 3569 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 3570 3571 #define ext4_ind_check_inode(inode) \ 3572 ext4_check_blockref(__func__, __LINE__, inode, \ 3573 EXT4_I(inode)->i_data, \ 3574 EXT4_NDIR_BLOCKS) 3575 3576 /* 3577 * Inodes and files operations 3578 */ 3579 3580 /* dir.c */ 3581 extern const struct file_operations ext4_dir_operations; 3582 3583 /* file.c */ 3584 extern const struct inode_operations ext4_file_inode_operations; 3585 extern const struct file_operations ext4_file_operations; 3586 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 3587 3588 /* inline.c */ 3589 extern int ext4_get_max_inline_size(struct inode *inode); 3590 extern int ext4_find_inline_data_nolock(struct inode *inode); 3591 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 3592 unsigned int len); 3593 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 3594 3595 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 3596 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 3597 struct inode *inode, 3598 loff_t pos, unsigned len, 3599 unsigned flags, 3600 struct page **pagep); 3601 extern int ext4_write_inline_data_end(struct inode *inode, 3602 loff_t pos, unsigned len, 3603 unsigned copied, 3604 struct page *page); 3605 extern struct buffer_head * 3606 ext4_journalled_write_inline_data(struct inode *inode, 3607 unsigned len, 3608 struct page *page); 3609 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 3610 struct inode *inode, 3611 loff_t pos, unsigned len, 3612 unsigned flags, 3613 struct page **pagep, 3614 void **fsdata); 3615 extern int ext4_try_add_inline_entry(handle_t *handle, 3616 struct ext4_filename *fname, 3617 struct inode *dir, struct inode *inode); 3618 extern int ext4_try_create_inline_dir(handle_t *handle, 3619 struct inode *parent, 3620 struct inode *inode); 3621 extern int ext4_read_inline_dir(struct file *filp, 3622 struct dir_context *ctx, 3623 int *has_inline_data); 3624 extern int ext4_inlinedir_to_tree(struct file *dir_file, 3625 struct inode *dir, ext4_lblk_t block, 3626 struct dx_hash_info *hinfo, 3627 __u32 start_hash, __u32 start_minor_hash, 3628 int *has_inline_data); 3629 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3630 struct ext4_filename *fname, 3631 struct ext4_dir_entry_2 **res_dir, 3632 int *has_inline_data); 3633 extern int ext4_delete_inline_entry(handle_t *handle, 3634 struct inode *dir, 3635 struct ext4_dir_entry_2 *de_del, 3636 struct buffer_head *bh, 3637 int *has_inline_data); 3638 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); 3639 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3640 struct ext4_dir_entry_2 **parent_de, 3641 int *retval); 3642 extern int ext4_inline_data_fiemap(struct inode *inode, 3643 struct fiemap_extent_info *fieinfo, 3644 int *has_inline, __u64 start, __u64 len); 3645 3646 struct iomap; 3647 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap); 3648 3649 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3650 3651 extern int ext4_convert_inline_data(struct inode *inode); 3652 3653 static inline int ext4_has_inline_data(struct inode *inode) 3654 { 3655 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3656 EXT4_I(inode)->i_inline_off; 3657 } 3658 3659 /* namei.c */ 3660 extern const struct inode_operations ext4_dir_inode_operations; 3661 extern const struct inode_operations ext4_special_inode_operations; 3662 extern struct dentry *ext4_get_parent(struct dentry *child); 3663 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3664 struct ext4_dir_entry_2 *de, 3665 int blocksize, int csum_size, 3666 unsigned int parent_ino, int dotdot_real_len); 3667 extern void ext4_initialize_dirent_tail(struct buffer_head *bh, 3668 unsigned int blocksize); 3669 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode, 3670 struct buffer_head *bh); 3671 extern int __ext4_unlink(handle_t *handle, struct inode *dir, const struct qstr *d_name, 3672 struct inode *inode); 3673 extern int __ext4_link(struct inode *dir, struct inode *inode, 3674 struct dentry *dentry); 3675 3676 #define S_SHIFT 12 3677 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = { 3678 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3679 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3680 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3681 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3682 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3683 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3684 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3685 }; 3686 3687 static inline void ext4_set_de_type(struct super_block *sb, 3688 struct ext4_dir_entry_2 *de, 3689 umode_t mode) { 3690 if (ext4_has_feature_filetype(sb)) 3691 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3692 } 3693 3694 /* readpages.c */ 3695 extern int ext4_mpage_readpages(struct inode *inode, 3696 struct readahead_control *rac, struct page *page); 3697 extern int __init ext4_init_post_read_processing(void); 3698 extern void ext4_exit_post_read_processing(void); 3699 3700 /* symlink.c */ 3701 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3702 extern const struct inode_operations ext4_symlink_inode_operations; 3703 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3704 3705 /* sysfs.c */ 3706 extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi); 3707 extern int ext4_register_sysfs(struct super_block *sb); 3708 extern void ext4_unregister_sysfs(struct super_block *sb); 3709 extern int __init ext4_init_sysfs(void); 3710 extern void ext4_exit_sysfs(void); 3711 3712 /* block_validity */ 3713 extern void ext4_release_system_zone(struct super_block *sb); 3714 extern int ext4_setup_system_zone(struct super_block *sb); 3715 extern int __init ext4_init_system_zone(void); 3716 extern void ext4_exit_system_zone(void); 3717 extern int ext4_inode_block_valid(struct inode *inode, 3718 ext4_fsblk_t start_blk, 3719 unsigned int count); 3720 extern int ext4_check_blockref(const char *, unsigned int, 3721 struct inode *, __le32 *, unsigned int); 3722 extern int ext4_sb_block_valid(struct super_block *sb, struct inode *inode, 3723 ext4_fsblk_t start_blk, unsigned int count); 3724 3725 3726 /* extents.c */ 3727 struct ext4_ext_path; 3728 struct ext4_extent; 3729 3730 /* 3731 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3732 * __le32. 3733 */ 3734 #define EXT_MAX_BLOCKS 0xffffffff 3735 3736 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode); 3737 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3738 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3739 struct ext4_map_blocks *map, int flags); 3740 extern int ext4_ext_truncate(handle_t *, struct inode *); 3741 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3742 ext4_lblk_t end); 3743 extern void ext4_ext_init(struct super_block *); 3744 extern void ext4_ext_release(struct super_block *); 3745 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3746 loff_t len); 3747 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3748 loff_t offset, ssize_t len); 3749 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle, 3750 ext4_io_end_t *io_end); 3751 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3752 struct ext4_map_blocks *map, int flags); 3753 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3754 int num, 3755 struct ext4_ext_path *path); 3756 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3757 struct ext4_ext_path **, 3758 struct ext4_extent *, int); 3759 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3760 struct ext4_ext_path **, 3761 int flags); 3762 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 3763 extern int ext4_ext_check_inode(struct inode *inode); 3764 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3765 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3766 __u64 start, __u64 len); 3767 extern int ext4_get_es_cache(struct inode *inode, 3768 struct fiemap_extent_info *fieinfo, 3769 __u64 start, __u64 len); 3770 extern int ext4_ext_precache(struct inode *inode); 3771 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3772 struct inode *inode2, ext4_lblk_t lblk1, 3773 ext4_lblk_t lblk2, ext4_lblk_t count, 3774 int mark_unwritten,int *err); 3775 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu); 3776 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode, 3777 int check_cred, int restart_cred, 3778 int revoke_cred); 3779 extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end); 3780 extern int ext4_ext_replay_set_iblocks(struct inode *inode); 3781 extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start, 3782 int len, int unwritten, ext4_fsblk_t pblk); 3783 extern int ext4_ext_clear_bb(struct inode *inode); 3784 3785 3786 /* move_extent.c */ 3787 extern void ext4_double_down_write_data_sem(struct inode *first, 3788 struct inode *second); 3789 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3790 struct inode *donor_inode); 3791 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3792 __u64 start_orig, __u64 start_donor, 3793 __u64 len, __u64 *moved_len); 3794 3795 /* page-io.c */ 3796 extern int __init ext4_init_pageio(void); 3797 extern void ext4_exit_pageio(void); 3798 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3799 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3800 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3801 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3802 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3803 struct writeback_control *wbc); 3804 extern void ext4_end_io_rsv_work(struct work_struct *work); 3805 extern void ext4_io_submit(struct ext4_io_submit *io); 3806 extern int ext4_bio_write_page(struct ext4_io_submit *io, 3807 struct page *page, 3808 int len, 3809 bool keep_towrite); 3810 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end); 3811 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end); 3812 3813 /* mmp.c */ 3814 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3815 3816 /* mmp.c */ 3817 extern void ext4_stop_mmpd(struct ext4_sb_info *sbi); 3818 3819 /* verity.c */ 3820 extern const struct fsverity_operations ext4_verityops; 3821 3822 /* orphan.c */ 3823 extern int ext4_orphan_add(handle_t *, struct inode *); 3824 extern int ext4_orphan_del(handle_t *, struct inode *); 3825 extern void ext4_orphan_cleanup(struct super_block *sb, 3826 struct ext4_super_block *es); 3827 extern void ext4_release_orphan_info(struct super_block *sb); 3828 extern int ext4_init_orphan_info(struct super_block *sb); 3829 extern int ext4_orphan_file_empty(struct super_block *sb); 3830 extern void ext4_orphan_file_block_trigger( 3831 struct jbd2_buffer_trigger_type *triggers, 3832 struct buffer_head *bh, 3833 void *data, size_t size); 3834 3835 /* 3836 * Add new method to test whether block and inode bitmaps are properly 3837 * initialized. With uninit_bg reading the block from disk is not enough 3838 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3839 */ 3840 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3841 3842 static inline int bitmap_uptodate(struct buffer_head *bh) 3843 { 3844 return (buffer_uptodate(bh) && 3845 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3846 } 3847 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3848 { 3849 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3850 } 3851 3852 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3853 3854 /* For ioend & aio unwritten conversion wait queues */ 3855 #define EXT4_WQ_HASH_SZ 37 3856 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3857 EXT4_WQ_HASH_SZ]) 3858 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3859 3860 extern int ext4_resize_begin(struct super_block *sb); 3861 extern void ext4_resize_end(struct super_block *sb); 3862 3863 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 3864 struct ext4_io_end *io_end) 3865 { 3866 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 3867 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3868 atomic_inc(&EXT4_I(inode)->i_unwritten); 3869 } 3870 } 3871 3872 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3873 { 3874 struct inode *inode = io_end->inode; 3875 3876 if (io_end->flag & EXT4_IO_END_UNWRITTEN) { 3877 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3878 /* Wake up anyone waiting on unwritten extent conversion */ 3879 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) 3880 wake_up_all(ext4_ioend_wq(inode)); 3881 } 3882 } 3883 3884 extern const struct iomap_ops ext4_iomap_ops; 3885 extern const struct iomap_ops ext4_iomap_overwrite_ops; 3886 extern const struct iomap_ops ext4_iomap_report_ops; 3887 3888 static inline int ext4_buffer_uptodate(struct buffer_head *bh) 3889 { 3890 /* 3891 * If the buffer has the write error flag, we have failed 3892 * to write out data in the block. In this case, we don't 3893 * have to read the block because we may read the old data 3894 * successfully. 3895 */ 3896 if (buffer_write_io_error(bh)) 3897 set_buffer_uptodate(bh); 3898 return buffer_uptodate(bh); 3899 } 3900 3901 #endif /* __KERNEL__ */ 3902 3903 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3904 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3905 3906 #endif /* _EXT4_H */ 3907