1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * ext4.h 4 * 5 * Copyright (C) 1992, 1993, 1994, 1995 6 * Remy Card (card@masi.ibp.fr) 7 * Laboratoire MASI - Institut Blaise Pascal 8 * Universite Pierre et Marie Curie (Paris VI) 9 * 10 * from 11 * 12 * linux/include/linux/minix_fs.h 13 * 14 * Copyright (C) 1991, 1992 Linus Torvalds 15 */ 16 17 #ifndef _EXT4_H 18 #define _EXT4_H 19 20 #include <linux/types.h> 21 #include <linux/blkdev.h> 22 #include <linux/magic.h> 23 #include <linux/jbd2.h> 24 #include <linux/quota.h> 25 #include <linux/rwsem.h> 26 #include <linux/rbtree.h> 27 #include <linux/seqlock.h> 28 #include <linux/mutex.h> 29 #include <linux/timer.h> 30 #include <linux/wait.h> 31 #include <linux/sched/signal.h> 32 #include <linux/blockgroup_lock.h> 33 #include <linux/percpu_counter.h> 34 #include <linux/ratelimit.h> 35 #include <crypto/hash.h> 36 #include <linux/falloc.h> 37 #include <linux/percpu-rwsem.h> 38 #include <linux/fiemap.h> 39 #ifdef __KERNEL__ 40 #include <linux/compat.h> 41 #endif 42 43 #include <linux/fscrypt.h> 44 #include <linux/fsverity.h> 45 46 #include <linux/compiler.h> 47 48 /* 49 * The fourth extended filesystem constants/structures 50 */ 51 52 /* 53 * with AGGRESSIVE_CHECK allocator runs consistency checks over 54 * structures. these checks slow things down a lot 55 */ 56 #define AGGRESSIVE_CHECK__ 57 58 /* 59 * with DOUBLE_CHECK defined mballoc creates persistent in-core 60 * bitmaps, maintains and uses them to check for double allocations 61 */ 62 #define DOUBLE_CHECK__ 63 64 /* 65 * Define EXT4FS_DEBUG to produce debug messages 66 */ 67 #undef EXT4FS_DEBUG 68 69 /* 70 * Debug code 71 */ 72 #ifdef EXT4FS_DEBUG 73 #define ext4_debug(f, a...) \ 74 do { \ 75 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 76 __FILE__, __LINE__, __func__); \ 77 printk(KERN_DEBUG f, ## a); \ 78 } while (0) 79 #else 80 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 81 #endif 82 83 /* 84 * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c 85 */ 86 #define EXT_DEBUG__ 87 88 /* 89 * Dynamic printk for controlled extents debugging. 90 */ 91 #ifdef CONFIG_EXT4_DEBUG 92 #define ext_debug(ino, fmt, ...) \ 93 pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt, \ 94 current->comm, task_pid_nr(current), \ 95 ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__, \ 96 __func__, ##__VA_ARGS__) 97 #else 98 #define ext_debug(ino, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 99 #endif 100 101 #define ASSERT(assert) \ 102 do { \ 103 if (unlikely(!(assert))) { \ 104 printk(KERN_EMERG \ 105 "Assertion failure in %s() at %s:%d: '%s'\n", \ 106 __func__, __FILE__, __LINE__, #assert); \ 107 BUG(); \ 108 } \ 109 } while (0) 110 111 /* data type for block offset of block group */ 112 typedef int ext4_grpblk_t; 113 114 /* data type for filesystem-wide blocks number */ 115 typedef unsigned long long ext4_fsblk_t; 116 117 /* data type for file logical block number */ 118 typedef __u32 ext4_lblk_t; 119 120 /* data type for block group number */ 121 typedef unsigned int ext4_group_t; 122 123 enum SHIFT_DIRECTION { 124 SHIFT_LEFT = 0, 125 SHIFT_RIGHT, 126 }; 127 128 /* 129 * Flags used in mballoc's allocation_context flags field. 130 * 131 * Also used to show what's going on for debugging purposes when the 132 * flag field is exported via the traceport interface 133 */ 134 135 /* prefer goal again. length */ 136 #define EXT4_MB_HINT_MERGE 0x0001 137 /* blocks already reserved */ 138 #define EXT4_MB_HINT_RESERVED 0x0002 139 /* metadata is being allocated */ 140 #define EXT4_MB_HINT_METADATA 0x0004 141 /* first blocks in the file */ 142 #define EXT4_MB_HINT_FIRST 0x0008 143 /* search for the best chunk */ 144 #define EXT4_MB_HINT_BEST 0x0010 145 /* data is being allocated */ 146 #define EXT4_MB_HINT_DATA 0x0020 147 /* don't preallocate (for tails) */ 148 #define EXT4_MB_HINT_NOPREALLOC 0x0040 149 /* allocate for locality group */ 150 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 151 /* allocate goal blocks or none */ 152 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 153 /* goal is meaningful */ 154 #define EXT4_MB_HINT_TRY_GOAL 0x0200 155 /* blocks already pre-reserved by delayed allocation */ 156 #define EXT4_MB_DELALLOC_RESERVED 0x0400 157 /* We are doing stream allocation */ 158 #define EXT4_MB_STREAM_ALLOC 0x0800 159 /* Use reserved root blocks if needed */ 160 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 161 /* Use blocks from reserved pool */ 162 #define EXT4_MB_USE_RESERVED 0x2000 163 /* Do strict check for free blocks while retrying block allocation */ 164 #define EXT4_MB_STRICT_CHECK 0x4000 165 /* Large fragment size list lookup succeeded at least once for cr = 0 */ 166 #define EXT4_MB_CR0_OPTIMIZED 0x8000 167 /* Avg fragment size rb tree lookup succeeded at least once for cr = 1 */ 168 #define EXT4_MB_CR1_OPTIMIZED 0x00010000 169 /* Perform linear traversal for one group */ 170 #define EXT4_MB_SEARCH_NEXT_LINEAR 0x00020000 171 struct ext4_allocation_request { 172 /* target inode for block we're allocating */ 173 struct inode *inode; 174 /* how many blocks we want to allocate */ 175 unsigned int len; 176 /* logical block in target inode */ 177 ext4_lblk_t logical; 178 /* the closest logical allocated block to the left */ 179 ext4_lblk_t lleft; 180 /* the closest logical allocated block to the right */ 181 ext4_lblk_t lright; 182 /* phys. target (a hint) */ 183 ext4_fsblk_t goal; 184 /* phys. block for the closest logical allocated block to the left */ 185 ext4_fsblk_t pleft; 186 /* phys. block for the closest logical allocated block to the right */ 187 ext4_fsblk_t pright; 188 /* flags. see above EXT4_MB_HINT_* */ 189 unsigned int flags; 190 }; 191 192 /* 193 * Logical to physical block mapping, used by ext4_map_blocks() 194 * 195 * This structure is used to pass requests into ext4_map_blocks() as 196 * well as to store the information returned by ext4_map_blocks(). It 197 * takes less room on the stack than a struct buffer_head. 198 */ 199 #define EXT4_MAP_NEW BIT(BH_New) 200 #define EXT4_MAP_MAPPED BIT(BH_Mapped) 201 #define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten) 202 #define EXT4_MAP_BOUNDARY BIT(BH_Boundary) 203 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 204 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 205 206 struct ext4_map_blocks { 207 ext4_fsblk_t m_pblk; 208 ext4_lblk_t m_lblk; 209 unsigned int m_len; 210 unsigned int m_flags; 211 }; 212 213 /* 214 * Block validity checking, system zone rbtree. 215 */ 216 struct ext4_system_blocks { 217 struct rb_root root; 218 struct rcu_head rcu; 219 }; 220 221 /* 222 * Flags for ext4_io_end->flags 223 */ 224 #define EXT4_IO_END_UNWRITTEN 0x0001 225 226 struct ext4_io_end_vec { 227 struct list_head list; /* list of io_end_vec */ 228 loff_t offset; /* offset in the file */ 229 ssize_t size; /* size of the extent */ 230 }; 231 232 /* 233 * For converting unwritten extents on a work queue. 'handle' is used for 234 * buffered writeback. 235 */ 236 typedef struct ext4_io_end { 237 struct list_head list; /* per-file finished IO list */ 238 handle_t *handle; /* handle reserved for extent 239 * conversion */ 240 struct inode *inode; /* file being written to */ 241 struct bio *bio; /* Linked list of completed 242 * bios covering the extent */ 243 unsigned int flag; /* unwritten or not */ 244 atomic_t count; /* reference counter */ 245 struct list_head list_vec; /* list of ext4_io_end_vec */ 246 } ext4_io_end_t; 247 248 struct ext4_io_submit { 249 struct writeback_control *io_wbc; 250 struct bio *io_bio; 251 ext4_io_end_t *io_end; 252 sector_t io_next_block; 253 }; 254 255 /* 256 * Special inodes numbers 257 */ 258 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 259 #define EXT4_ROOT_INO 2 /* Root inode */ 260 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 261 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 262 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 263 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 264 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 265 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 266 267 /* First non-reserved inode for old ext4 filesystems */ 268 #define EXT4_GOOD_OLD_FIRST_INO 11 269 270 /* 271 * Maximal count of links to a file 272 */ 273 #define EXT4_LINK_MAX 65000 274 275 /* 276 * Macro-instructions used to manage several block sizes 277 */ 278 #define EXT4_MIN_BLOCK_SIZE 1024 279 #define EXT4_MAX_BLOCK_SIZE 65536 280 #define EXT4_MIN_BLOCK_LOG_SIZE 10 281 #define EXT4_MAX_BLOCK_LOG_SIZE 16 282 #define EXT4_MAX_CLUSTER_LOG_SIZE 30 283 #ifdef __KERNEL__ 284 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 285 #else 286 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 287 #endif 288 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 289 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 290 EXT4_SB(s)->s_cluster_bits) 291 #ifdef __KERNEL__ 292 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 293 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 294 #else 295 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 296 #endif 297 #ifdef __KERNEL__ 298 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 299 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 300 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 301 #else 302 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 303 EXT4_GOOD_OLD_INODE_SIZE : \ 304 (s)->s_inode_size) 305 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 306 EXT4_GOOD_OLD_FIRST_INO : \ 307 (s)->s_first_ino) 308 #endif 309 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 310 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \ 311 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \ 312 blkbits)) 313 314 /* Translate a block number to a cluster number */ 315 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 316 /* Translate a cluster number to a block number */ 317 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 318 /* Translate # of blks to # of clusters */ 319 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 320 (sbi)->s_cluster_bits) 321 /* Mask out the low bits to get the starting block of the cluster */ 322 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 323 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 324 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 325 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 326 /* Fill in the low bits to get the last block of the cluster */ 327 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \ 328 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1)) 329 /* Get the cluster offset */ 330 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 331 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 332 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 333 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 334 335 /* 336 * Structure of a blocks group descriptor 337 */ 338 struct ext4_group_desc 339 { 340 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 341 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 342 __le32 bg_inode_table_lo; /* Inodes table block */ 343 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 344 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 345 __le16 bg_used_dirs_count_lo; /* Directories count */ 346 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 347 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 348 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 349 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 350 __le16 bg_itable_unused_lo; /* Unused inodes count */ 351 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 352 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 353 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 354 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 355 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 356 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 357 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 358 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 359 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 360 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 361 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 362 __u32 bg_reserved; 363 }; 364 365 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 366 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 367 sizeof(__le16)) 368 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 369 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 370 sizeof(__le16)) 371 372 /* 373 * Structure of a flex block group info 374 */ 375 376 struct flex_groups { 377 atomic64_t free_clusters; 378 atomic_t free_inodes; 379 atomic_t used_dirs; 380 }; 381 382 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 383 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 384 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 385 386 /* 387 * Macro-instructions used to manage group descriptors 388 */ 389 #define EXT4_MIN_DESC_SIZE 32 390 #define EXT4_MIN_DESC_SIZE_64BIT 64 391 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 392 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 393 #ifdef __KERNEL__ 394 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 395 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 396 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 397 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 398 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 399 #else 400 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 401 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 402 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 403 #endif 404 405 /* 406 * Constants relative to the data blocks 407 */ 408 #define EXT4_NDIR_BLOCKS 12 409 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 410 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 411 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 412 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 413 414 /* 415 * Inode flags 416 */ 417 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 418 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 419 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 420 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 421 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 422 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 423 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 424 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 425 /* Reserved for compression usage... */ 426 #define EXT4_DIRTY_FL 0x00000100 427 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 428 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 429 /* nb: was previously EXT2_ECOMPR_FL */ 430 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 431 /* End compression flags --- maybe not all used */ 432 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 433 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 434 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 435 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 436 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 437 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 438 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 439 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 440 #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */ 441 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 442 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */ 443 444 #define EXT4_DAX_FL 0x02000000 /* Inode is DAX */ 445 446 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 447 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 448 #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */ 449 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 450 451 /* User modifiable flags */ 452 #define EXT4_FL_USER_MODIFIABLE (EXT4_SECRM_FL | \ 453 EXT4_UNRM_FL | \ 454 EXT4_COMPR_FL | \ 455 EXT4_SYNC_FL | \ 456 EXT4_IMMUTABLE_FL | \ 457 EXT4_APPEND_FL | \ 458 EXT4_NODUMP_FL | \ 459 EXT4_NOATIME_FL | \ 460 EXT4_JOURNAL_DATA_FL | \ 461 EXT4_NOTAIL_FL | \ 462 EXT4_DIRSYNC_FL | \ 463 EXT4_TOPDIR_FL | \ 464 EXT4_EXTENTS_FL | \ 465 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \ 466 EXT4_DAX_FL | \ 467 EXT4_PROJINHERIT_FL | \ 468 EXT4_CASEFOLD_FL) 469 470 /* User visible flags */ 471 #define EXT4_FL_USER_VISIBLE (EXT4_FL_USER_MODIFIABLE | \ 472 EXT4_DIRTY_FL | \ 473 EXT4_COMPRBLK_FL | \ 474 EXT4_NOCOMPR_FL | \ 475 EXT4_ENCRYPT_FL | \ 476 EXT4_INDEX_FL | \ 477 EXT4_VERITY_FL | \ 478 EXT4_INLINE_DATA_FL) 479 480 /* Flags that should be inherited by new inodes from their parent. */ 481 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 482 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 483 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 484 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 485 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\ 486 EXT4_DAX_FL) 487 488 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 489 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\ 490 EXT4_PROJINHERIT_FL)) 491 492 /* Flags that are appropriate for non-directories/regular files. */ 493 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 494 495 /* The only flags that should be swapped */ 496 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL) 497 498 /* Flags which are mutually exclusive to DAX */ 499 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\ 500 EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL) 501 502 /* Mask out flags that are inappropriate for the given type of inode. */ 503 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 504 { 505 if (S_ISDIR(mode)) 506 return flags; 507 else if (S_ISREG(mode)) 508 return flags & EXT4_REG_FLMASK; 509 else 510 return flags & EXT4_OTHER_FLMASK; 511 } 512 513 /* 514 * Inode flags used for atomic set/get 515 */ 516 enum { 517 EXT4_INODE_SECRM = 0, /* Secure deletion */ 518 EXT4_INODE_UNRM = 1, /* Undelete */ 519 EXT4_INODE_COMPR = 2, /* Compress file */ 520 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 521 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 522 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 523 EXT4_INODE_NODUMP = 6, /* do not dump file */ 524 EXT4_INODE_NOATIME = 7, /* do not update atime */ 525 /* Reserved for compression usage... */ 526 EXT4_INODE_DIRTY = 8, 527 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 528 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 529 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 530 /* End compression flags --- maybe not all used */ 531 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 532 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 533 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 534 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 535 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 536 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 537 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 538 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 539 EXT4_INODE_VERITY = 20, /* Verity protected inode */ 540 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 541 /* 22 was formerly EXT4_INODE_EOFBLOCKS */ 542 EXT4_INODE_DAX = 25, /* Inode is DAX */ 543 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 544 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 545 EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */ 546 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 547 }; 548 549 /* 550 * Since it's pretty easy to mix up bit numbers and hex values, we use a 551 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 552 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 553 * any extra space in the compiled kernel image, otherwise, the build will fail. 554 * It's important that these values are the same, since we are using 555 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 556 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 557 * values found in ext2, ext3 and ext4 filesystems, and of course the values 558 * defined in e2fsprogs. 559 * 560 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 561 */ 562 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 563 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 564 565 static inline void ext4_check_flag_values(void) 566 { 567 CHECK_FLAG_VALUE(SECRM); 568 CHECK_FLAG_VALUE(UNRM); 569 CHECK_FLAG_VALUE(COMPR); 570 CHECK_FLAG_VALUE(SYNC); 571 CHECK_FLAG_VALUE(IMMUTABLE); 572 CHECK_FLAG_VALUE(APPEND); 573 CHECK_FLAG_VALUE(NODUMP); 574 CHECK_FLAG_VALUE(NOATIME); 575 CHECK_FLAG_VALUE(DIRTY); 576 CHECK_FLAG_VALUE(COMPRBLK); 577 CHECK_FLAG_VALUE(NOCOMPR); 578 CHECK_FLAG_VALUE(ENCRYPT); 579 CHECK_FLAG_VALUE(INDEX); 580 CHECK_FLAG_VALUE(IMAGIC); 581 CHECK_FLAG_VALUE(JOURNAL_DATA); 582 CHECK_FLAG_VALUE(NOTAIL); 583 CHECK_FLAG_VALUE(DIRSYNC); 584 CHECK_FLAG_VALUE(TOPDIR); 585 CHECK_FLAG_VALUE(HUGE_FILE); 586 CHECK_FLAG_VALUE(EXTENTS); 587 CHECK_FLAG_VALUE(VERITY); 588 CHECK_FLAG_VALUE(EA_INODE); 589 CHECK_FLAG_VALUE(INLINE_DATA); 590 CHECK_FLAG_VALUE(PROJINHERIT); 591 CHECK_FLAG_VALUE(CASEFOLD); 592 CHECK_FLAG_VALUE(RESERVED); 593 } 594 595 /* Used to pass group descriptor data when online resize is done */ 596 struct ext4_new_group_input { 597 __u32 group; /* Group number for this data */ 598 __u64 block_bitmap; /* Absolute block number of block bitmap */ 599 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 600 __u64 inode_table; /* Absolute block number of inode table start */ 601 __u32 blocks_count; /* Total number of blocks in this group */ 602 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 603 __u16 unused; 604 }; 605 606 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 607 struct compat_ext4_new_group_input { 608 u32 group; 609 compat_u64 block_bitmap; 610 compat_u64 inode_bitmap; 611 compat_u64 inode_table; 612 u32 blocks_count; 613 u16 reserved_blocks; 614 u16 unused; 615 }; 616 #endif 617 618 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 619 struct ext4_new_group_data { 620 __u32 group; 621 __u64 block_bitmap; 622 __u64 inode_bitmap; 623 __u64 inode_table; 624 __u32 blocks_count; 625 __u16 reserved_blocks; 626 __u16 mdata_blocks; 627 __u32 free_clusters_count; 628 }; 629 630 /* Indexes used to index group tables in ext4_new_group_data */ 631 enum { 632 BLOCK_BITMAP = 0, /* block bitmap */ 633 INODE_BITMAP, /* inode bitmap */ 634 INODE_TABLE, /* inode tables */ 635 GROUP_TABLE_COUNT, 636 }; 637 638 /* 639 * Flags used by ext4_map_blocks() 640 */ 641 /* Allocate any needed blocks and/or convert an unwritten 642 extent to be an initialized ext4 */ 643 #define EXT4_GET_BLOCKS_CREATE 0x0001 644 /* Request the creation of an unwritten extent */ 645 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 646 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 647 EXT4_GET_BLOCKS_CREATE) 648 /* Caller is from the delayed allocation writeout path 649 * finally doing the actual allocation of delayed blocks */ 650 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 651 /* caller is from the direct IO path, request to creation of an 652 unwritten extents if not allocated, split the unwritten 653 extent if blocks has been preallocated already*/ 654 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 655 #define EXT4_GET_BLOCKS_CONVERT 0x0010 656 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 657 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 658 /* Convert extent to initialized after IO complete */ 659 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 660 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 661 /* Eventual metadata allocation (due to growing extent tree) 662 * should not fail, so try to use reserved blocks for that.*/ 663 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 664 /* Don't normalize allocation size (used for fallocate) */ 665 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 666 /* Convert written extents to unwritten */ 667 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 668 /* Write zeros to newly created written extents */ 669 #define EXT4_GET_BLOCKS_ZERO 0x0200 670 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 671 EXT4_GET_BLOCKS_ZERO) 672 /* Caller will submit data before dropping transaction handle. This 673 * allows jbd2 to avoid submitting data before commit. */ 674 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 675 676 /* 677 * The bit position of these flags must not overlap with any of the 678 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 679 * read_extent_tree_block(), ext4_split_extent_at(), 680 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 681 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 682 * caching the extents when reading from the extent tree while a 683 * truncate or punch hole operation is in progress. 684 */ 685 #define EXT4_EX_NOCACHE 0x40000000 686 #define EXT4_EX_FORCE_CACHE 0x20000000 687 #define EXT4_EX_NOFAIL 0x10000000 688 689 /* 690 * Flags used by ext4_free_blocks 691 */ 692 #define EXT4_FREE_BLOCKS_METADATA 0x0001 693 #define EXT4_FREE_BLOCKS_FORGET 0x0002 694 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 695 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 696 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 697 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 698 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040 699 700 /* 701 * ioctl commands 702 */ 703 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 704 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 705 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 706 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 707 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 708 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 709 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 710 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 711 #define EXT4_IOC_MIGRATE _IO('f', 9) 712 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 713 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 714 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 715 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 716 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 717 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 718 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 719 /* ioctl codes 19--39 are reserved for fscrypt */ 720 #define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40) 721 #define EXT4_IOC_GETSTATE _IOW('f', 41, __u32) 722 #define EXT4_IOC_GET_ES_CACHE _IOWR('f', 42, struct fiemap) 723 #define EXT4_IOC_CHECKPOINT _IOW('f', 43, __u32) 724 725 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32) 726 727 /* 728 * Flags for going down operation 729 */ 730 #define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */ 731 #define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */ 732 #define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */ 733 734 /* 735 * Flags returned by EXT4_IOC_GETSTATE 736 * 737 * We only expose to userspace a subset of the state flags in 738 * i_state_flags 739 */ 740 #define EXT4_STATE_FLAG_EXT_PRECACHED 0x00000001 741 #define EXT4_STATE_FLAG_NEW 0x00000002 742 #define EXT4_STATE_FLAG_NEWENTRY 0x00000004 743 #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE 0x00000008 744 745 /* flags for ioctl EXT4_IOC_CHECKPOINT */ 746 #define EXT4_IOC_CHECKPOINT_FLAG_DISCARD 0x1 747 #define EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT 0x2 748 #define EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN 0x4 749 #define EXT4_IOC_CHECKPOINT_FLAG_VALID (EXT4_IOC_CHECKPOINT_FLAG_DISCARD | \ 750 EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT | \ 751 EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN) 752 753 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 754 /* 755 * ioctl commands in 32 bit emulation 756 */ 757 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 758 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 759 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 760 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 761 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 762 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 763 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 764 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 765 #endif 766 767 /* 768 * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag. 769 * It indicates that the entry in extent status cache is for a hole. 770 */ 771 #define EXT4_FIEMAP_EXTENT_HOLE 0x08000000 772 773 /* Max physical block we can address w/o extents */ 774 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 775 776 /* Max logical block we can support */ 777 #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE 778 779 /* 780 * Structure of an inode on the disk 781 */ 782 struct ext4_inode { 783 __le16 i_mode; /* File mode */ 784 __le16 i_uid; /* Low 16 bits of Owner Uid */ 785 __le32 i_size_lo; /* Size in bytes */ 786 __le32 i_atime; /* Access time */ 787 __le32 i_ctime; /* Inode Change time */ 788 __le32 i_mtime; /* Modification time */ 789 __le32 i_dtime; /* Deletion Time */ 790 __le16 i_gid; /* Low 16 bits of Group Id */ 791 __le16 i_links_count; /* Links count */ 792 __le32 i_blocks_lo; /* Blocks count */ 793 __le32 i_flags; /* File flags */ 794 union { 795 struct { 796 __le32 l_i_version; 797 } linux1; 798 struct { 799 __u32 h_i_translator; 800 } hurd1; 801 struct { 802 __u32 m_i_reserved1; 803 } masix1; 804 } osd1; /* OS dependent 1 */ 805 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 806 __le32 i_generation; /* File version (for NFS) */ 807 __le32 i_file_acl_lo; /* File ACL */ 808 __le32 i_size_high; 809 __le32 i_obso_faddr; /* Obsoleted fragment address */ 810 union { 811 struct { 812 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 813 __le16 l_i_file_acl_high; 814 __le16 l_i_uid_high; /* these 2 fields */ 815 __le16 l_i_gid_high; /* were reserved2[0] */ 816 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 817 __le16 l_i_reserved; 818 } linux2; 819 struct { 820 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 821 __u16 h_i_mode_high; 822 __u16 h_i_uid_high; 823 __u16 h_i_gid_high; 824 __u32 h_i_author; 825 } hurd2; 826 struct { 827 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 828 __le16 m_i_file_acl_high; 829 __u32 m_i_reserved2[2]; 830 } masix2; 831 } osd2; /* OS dependent 2 */ 832 __le16 i_extra_isize; 833 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 834 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 835 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 836 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 837 __le32 i_crtime; /* File Creation time */ 838 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 839 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 840 __le32 i_projid; /* Project ID */ 841 }; 842 843 struct move_extent { 844 __u32 reserved; /* should be zero */ 845 __u32 donor_fd; /* donor file descriptor */ 846 __u64 orig_start; /* logical start offset in block for orig */ 847 __u64 donor_start; /* logical start offset in block for donor */ 848 __u64 len; /* block length to be moved */ 849 __u64 moved_len; /* moved block length */ 850 }; 851 852 #define EXT4_EPOCH_BITS 2 853 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 854 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 855 856 /* 857 * Extended fields will fit into an inode if the filesystem was formatted 858 * with large inodes (-I 256 or larger) and there are not currently any EAs 859 * consuming all of the available space. For new inodes we always reserve 860 * enough space for the kernel's known extended fields, but for inodes 861 * created with an old kernel this might not have been the case. None of 862 * the extended inode fields is critical for correct filesystem operation. 863 * This macro checks if a certain field fits in the inode. Note that 864 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 865 */ 866 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 867 ((offsetof(typeof(*ext4_inode), field) + \ 868 sizeof((ext4_inode)->field)) \ 869 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 870 (einode)->i_extra_isize)) \ 871 872 /* 873 * We use an encoding that preserves the times for extra epoch "00": 874 * 875 * extra msb of adjust for signed 876 * epoch 32-bit 32-bit tv_sec to 877 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 878 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 879 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 880 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 881 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 882 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 883 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 884 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 885 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 886 * 887 * Note that previous versions of the kernel on 64-bit systems would 888 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 889 * 1970. e2fsck will correct this, assuming that it is run on the 890 * affected filesystem before 2242. 891 */ 892 893 static inline __le32 ext4_encode_extra_time(struct timespec64 *time) 894 { 895 u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK; 896 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); 897 } 898 899 static inline void ext4_decode_extra_time(struct timespec64 *time, 900 __le32 extra) 901 { 902 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) 903 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 904 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 905 } 906 907 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 908 do { \ 909 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\ 910 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 911 (raw_inode)->xtime ## _extra = \ 912 ext4_encode_extra_time(&(inode)->xtime); \ 913 } \ 914 else \ 915 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX)); \ 916 } while (0) 917 918 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 919 do { \ 920 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 921 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 922 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 923 (raw_inode)->xtime ## _extra = \ 924 ext4_encode_extra_time(&(einode)->xtime); \ 925 } while (0) 926 927 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 928 do { \ 929 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 930 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \ 931 ext4_decode_extra_time(&(inode)->xtime, \ 932 raw_inode->xtime ## _extra); \ 933 } \ 934 else \ 935 (inode)->xtime.tv_nsec = 0; \ 936 } while (0) 937 938 939 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 940 do { \ 941 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 942 (einode)->xtime.tv_sec = \ 943 (signed)le32_to_cpu((raw_inode)->xtime); \ 944 else \ 945 (einode)->xtime.tv_sec = 0; \ 946 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 947 ext4_decode_extra_time(&(einode)->xtime, \ 948 raw_inode->xtime ## _extra); \ 949 else \ 950 (einode)->xtime.tv_nsec = 0; \ 951 } while (0) 952 953 #define i_disk_version osd1.linux1.l_i_version 954 955 #if defined(__KERNEL__) || defined(__linux__) 956 #define i_reserved1 osd1.linux1.l_i_reserved1 957 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 958 #define i_blocks_high osd2.linux2.l_i_blocks_high 959 #define i_uid_low i_uid 960 #define i_gid_low i_gid 961 #define i_uid_high osd2.linux2.l_i_uid_high 962 #define i_gid_high osd2.linux2.l_i_gid_high 963 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 964 965 #elif defined(__GNU__) 966 967 #define i_translator osd1.hurd1.h_i_translator 968 #define i_uid_high osd2.hurd2.h_i_uid_high 969 #define i_gid_high osd2.hurd2.h_i_gid_high 970 #define i_author osd2.hurd2.h_i_author 971 972 #elif defined(__masix__) 973 974 #define i_reserved1 osd1.masix1.m_i_reserved1 975 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 976 #define i_reserved2 osd2.masix2.m_i_reserved2 977 978 #endif /* defined(__KERNEL__) || defined(__linux__) */ 979 980 #include "extents_status.h" 981 #include "fast_commit.h" 982 983 /* 984 * Lock subclasses for i_data_sem in the ext4_inode_info structure. 985 * 986 * These are needed to avoid lockdep false positives when we need to 987 * allocate blocks to the quota inode during ext4_map_blocks(), while 988 * holding i_data_sem for a normal (non-quota) inode. Since we don't 989 * do quota tracking for the quota inode, this avoids deadlock (as 990 * well as infinite recursion, since it isn't turtles all the way 991 * down...) 992 * 993 * I_DATA_SEM_NORMAL - Used for most inodes 994 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode 995 * where the second inode has larger inode number 996 * than the first 997 * I_DATA_SEM_QUOTA - Used for quota inodes only 998 */ 999 enum { 1000 I_DATA_SEM_NORMAL = 0, 1001 I_DATA_SEM_OTHER, 1002 I_DATA_SEM_QUOTA, 1003 }; 1004 1005 1006 /* 1007 * fourth extended file system inode data in memory 1008 */ 1009 struct ext4_inode_info { 1010 __le32 i_data[15]; /* unconverted */ 1011 __u32 i_dtime; 1012 ext4_fsblk_t i_file_acl; 1013 1014 /* 1015 * i_block_group is the number of the block group which contains 1016 * this file's inode. Constant across the lifetime of the inode, 1017 * it is used for making block allocation decisions - we try to 1018 * place a file's data blocks near its inode block, and new inodes 1019 * near to their parent directory's inode. 1020 */ 1021 ext4_group_t i_block_group; 1022 ext4_lblk_t i_dir_start_lookup; 1023 #if (BITS_PER_LONG < 64) 1024 unsigned long i_state_flags; /* Dynamic state flags */ 1025 #endif 1026 unsigned long i_flags; 1027 1028 /* 1029 * Extended attributes can be read independently of the main file 1030 * data. Taking i_mutex even when reading would cause contention 1031 * between readers of EAs and writers of regular file data, so 1032 * instead we synchronize on xattr_sem when reading or changing 1033 * EAs. 1034 */ 1035 struct rw_semaphore xattr_sem; 1036 1037 struct list_head i_orphan; /* unlinked but open inodes */ 1038 1039 /* Fast commit related info */ 1040 1041 struct list_head i_fc_list; /* 1042 * inodes that need fast commit 1043 * protected by sbi->s_fc_lock. 1044 */ 1045 1046 /* Start of lblk range that needs to be committed in this fast commit */ 1047 ext4_lblk_t i_fc_lblk_start; 1048 1049 /* End of lblk range that needs to be committed in this fast commit */ 1050 ext4_lblk_t i_fc_lblk_len; 1051 1052 /* Number of ongoing updates on this inode */ 1053 atomic_t i_fc_updates; 1054 1055 /* Fast commit wait queue for this inode */ 1056 wait_queue_head_t i_fc_wait; 1057 1058 /* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */ 1059 struct mutex i_fc_lock; 1060 1061 /* 1062 * i_disksize keeps track of what the inode size is ON DISK, not 1063 * in memory. During truncate, i_size is set to the new size by 1064 * the VFS prior to calling ext4_truncate(), but the filesystem won't 1065 * set i_disksize to 0 until the truncate is actually under way. 1066 * 1067 * The intent is that i_disksize always represents the blocks which 1068 * are used by this file. This allows recovery to restart truncate 1069 * on orphans if we crash during truncate. We actually write i_disksize 1070 * into the on-disk inode when writing inodes out, instead of i_size. 1071 * 1072 * The only time when i_disksize and i_size may be different is when 1073 * a truncate is in progress. The only things which change i_disksize 1074 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 1075 */ 1076 loff_t i_disksize; 1077 1078 /* 1079 * i_data_sem is for serialising ext4_truncate() against 1080 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 1081 * data tree are chopped off during truncate. We can't do that in 1082 * ext4 because whenever we perform intermediate commits during 1083 * truncate, the inode and all the metadata blocks *must* be in a 1084 * consistent state which allows truncation of the orphans to restart 1085 * during recovery. Hence we must fix the get_block-vs-truncate race 1086 * by other means, so we have i_data_sem. 1087 */ 1088 struct rw_semaphore i_data_sem; 1089 /* 1090 * i_mmap_sem is for serializing page faults with truncate / punch hole 1091 * operations. We have to make sure that new page cannot be faulted in 1092 * a section of the inode that is being punched. We cannot easily use 1093 * i_data_sem for this since we need protection for the whole punch 1094 * operation and i_data_sem ranks below transaction start so we have 1095 * to occasionally drop it. 1096 */ 1097 struct rw_semaphore i_mmap_sem; 1098 struct inode vfs_inode; 1099 struct jbd2_inode *jinode; 1100 1101 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 1102 1103 /* 1104 * File creation time. Its function is same as that of 1105 * struct timespec64 i_{a,c,m}time in the generic inode. 1106 */ 1107 struct timespec64 i_crtime; 1108 1109 /* mballoc */ 1110 atomic_t i_prealloc_active; 1111 struct list_head i_prealloc_list; 1112 spinlock_t i_prealloc_lock; 1113 1114 /* extents status tree */ 1115 struct ext4_es_tree i_es_tree; 1116 rwlock_t i_es_lock; 1117 struct list_head i_es_list; 1118 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1119 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1120 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1121 extents to shrink. Protected by 1122 i_es_lock */ 1123 1124 /* ialloc */ 1125 ext4_group_t i_last_alloc_group; 1126 1127 /* allocation reservation info for delalloc */ 1128 /* In case of bigalloc, this refer to clusters rather than blocks */ 1129 unsigned int i_reserved_data_blocks; 1130 1131 /* pending cluster reservations for bigalloc file systems */ 1132 struct ext4_pending_tree i_pending_tree; 1133 1134 /* on-disk additional length */ 1135 __u16 i_extra_isize; 1136 1137 /* Indicate the inline data space. */ 1138 u16 i_inline_off; 1139 u16 i_inline_size; 1140 1141 #ifdef CONFIG_QUOTA 1142 /* quota space reservation, managed internally by quota code */ 1143 qsize_t i_reserved_quota; 1144 #endif 1145 1146 /* Lock protecting lists below */ 1147 spinlock_t i_completed_io_lock; 1148 /* 1149 * Completed IOs that need unwritten extents handling and have 1150 * transaction reserved 1151 */ 1152 struct list_head i_rsv_conversion_list; 1153 struct work_struct i_rsv_conversion_work; 1154 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 1155 1156 spinlock_t i_block_reservation_lock; 1157 1158 /* 1159 * Transactions that contain inode's metadata needed to complete 1160 * fsync and fdatasync, respectively. 1161 */ 1162 tid_t i_sync_tid; 1163 tid_t i_datasync_tid; 1164 1165 #ifdef CONFIG_QUOTA 1166 struct dquot *i_dquot[MAXQUOTAS]; 1167 #endif 1168 1169 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1170 __u32 i_csum_seed; 1171 1172 kprojid_t i_projid; 1173 }; 1174 1175 /* 1176 * File system states 1177 */ 1178 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1179 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1180 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1181 #define EXT4_FC_REPLAY 0x0020 /* Fast commit replay ongoing */ 1182 1183 /* 1184 * Misc. filesystem flags 1185 */ 1186 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1187 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1188 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1189 1190 /* 1191 * Mount flags set via mount options or defaults 1192 */ 1193 #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */ 1194 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1195 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1196 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1197 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1198 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1199 #define EXT4_MOUNT_ERRORS_MASK 0x00070 1200 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1201 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1202 #ifdef CONFIG_FS_DAX 1203 #define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */ 1204 #else 1205 #define EXT4_MOUNT_DAX_ALWAYS 0 1206 #endif 1207 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1208 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1209 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1210 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1211 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1212 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1213 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1214 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1215 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1216 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1217 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */ 1218 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota, 1219 * enable enforcement for hidden 1220 * quota files */ 1221 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable 1222 * enforcement for hidden quota 1223 * files */ 1224 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota 1225 * enforcement */ 1226 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1227 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1228 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1229 #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */ 1230 #define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000 1231 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1232 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1233 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1234 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1235 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1236 1237 /* 1238 * Mount flags set either automatically (could not be set by mount option) 1239 * based on per file system feature or property or in special cases such as 1240 * distinguishing between explicit mount option definition and default. 1241 */ 1242 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1243 specified delalloc */ 1244 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1245 size of blocksize * 8 1246 blocks */ 1247 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1248 file systems */ 1249 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1250 specified journal checksum */ 1251 1252 #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */ 1253 #define EXT4_MOUNT2_DAX_NEVER 0x00000020 /* Do not allow Direct Access */ 1254 #define EXT4_MOUNT2_DAX_INODE 0x00000040 /* For printing options only */ 1255 #define EXT4_MOUNT2_MB_OPTIMIZE_SCAN 0x00000080 /* Optimize group 1256 * scanning in mballoc 1257 */ 1258 1259 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1260 ~EXT4_MOUNT_##opt 1261 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1262 EXT4_MOUNT_##opt 1263 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1264 EXT4_MOUNT_##opt) 1265 1266 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1267 ~EXT4_MOUNT2_##opt 1268 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1269 EXT4_MOUNT2_##opt 1270 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1271 EXT4_MOUNT2_##opt) 1272 1273 #define ext4_test_and_set_bit __test_and_set_bit_le 1274 #define ext4_set_bit __set_bit_le 1275 #define ext4_set_bit_atomic ext2_set_bit_atomic 1276 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1277 #define ext4_clear_bit __clear_bit_le 1278 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1279 #define ext4_test_bit test_bit_le 1280 #define ext4_find_next_zero_bit find_next_zero_bit_le 1281 #define ext4_find_next_bit find_next_bit_le 1282 1283 extern void ext4_set_bits(void *bm, int cur, int len); 1284 1285 /* 1286 * Maximal mount counts between two filesystem checks 1287 */ 1288 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1289 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1290 1291 /* 1292 * Behaviour when detecting errors 1293 */ 1294 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1295 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1296 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1297 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1298 1299 /* Metadata checksum algorithm codes */ 1300 #define EXT4_CRC32C_CHKSUM 1 1301 1302 /* 1303 * Structure of the super block 1304 */ 1305 struct ext4_super_block { 1306 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1307 __le32 s_blocks_count_lo; /* Blocks count */ 1308 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1309 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1310 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1311 __le32 s_first_data_block; /* First Data Block */ 1312 __le32 s_log_block_size; /* Block size */ 1313 __le32 s_log_cluster_size; /* Allocation cluster size */ 1314 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1315 __le32 s_clusters_per_group; /* # Clusters per group */ 1316 __le32 s_inodes_per_group; /* # Inodes per group */ 1317 __le32 s_mtime; /* Mount time */ 1318 /*30*/ __le32 s_wtime; /* Write time */ 1319 __le16 s_mnt_count; /* Mount count */ 1320 __le16 s_max_mnt_count; /* Maximal mount count */ 1321 __le16 s_magic; /* Magic signature */ 1322 __le16 s_state; /* File system state */ 1323 __le16 s_errors; /* Behaviour when detecting errors */ 1324 __le16 s_minor_rev_level; /* minor revision level */ 1325 /*40*/ __le32 s_lastcheck; /* time of last check */ 1326 __le32 s_checkinterval; /* max. time between checks */ 1327 __le32 s_creator_os; /* OS */ 1328 __le32 s_rev_level; /* Revision level */ 1329 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1330 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1331 /* 1332 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1333 * 1334 * Note: the difference between the compatible feature set and 1335 * the incompatible feature set is that if there is a bit set 1336 * in the incompatible feature set that the kernel doesn't 1337 * know about, it should refuse to mount the filesystem. 1338 * 1339 * e2fsck's requirements are more strict; if it doesn't know 1340 * about a feature in either the compatible or incompatible 1341 * feature set, it must abort and not try to meddle with 1342 * things it doesn't understand... 1343 */ 1344 __le32 s_first_ino; /* First non-reserved inode */ 1345 __le16 s_inode_size; /* size of inode structure */ 1346 __le16 s_block_group_nr; /* block group # of this superblock */ 1347 __le32 s_feature_compat; /* compatible feature set */ 1348 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1349 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1350 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1351 /*78*/ char s_volume_name[16]; /* volume name */ 1352 /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */ 1353 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1354 /* 1355 * Performance hints. Directory preallocation should only 1356 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1357 */ 1358 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1359 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1360 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1361 /* 1362 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1363 */ 1364 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1365 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1366 __le32 s_journal_dev; /* device number of journal file */ 1367 __le32 s_last_orphan; /* start of list of inodes to delete */ 1368 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1369 __u8 s_def_hash_version; /* Default hash version to use */ 1370 __u8 s_jnl_backup_type; 1371 __le16 s_desc_size; /* size of group descriptor */ 1372 /*100*/ __le32 s_default_mount_opts; 1373 __le32 s_first_meta_bg; /* First metablock block group */ 1374 __le32 s_mkfs_time; /* When the filesystem was created */ 1375 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1376 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1377 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1378 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1379 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1380 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1381 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1382 __le32 s_flags; /* Miscellaneous flags */ 1383 __le16 s_raid_stride; /* RAID stride */ 1384 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1385 __le64 s_mmp_block; /* Block for multi-mount protection */ 1386 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1387 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1388 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1389 __u8 s_encryption_level; /* versioning level for encryption */ 1390 __u8 s_reserved_pad; /* Padding to next 32bits */ 1391 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1392 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1393 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1394 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1395 snapshot's future use */ 1396 __le32 s_snapshot_list; /* inode number of the head of the 1397 on-disk snapshot list */ 1398 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1399 __le32 s_error_count; /* number of fs errors */ 1400 __le32 s_first_error_time; /* first time an error happened */ 1401 __le32 s_first_error_ino; /* inode involved in first error */ 1402 __le64 s_first_error_block; /* block involved of first error */ 1403 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */ 1404 __le32 s_first_error_line; /* line number where error happened */ 1405 __le32 s_last_error_time; /* most recent time of an error */ 1406 __le32 s_last_error_ino; /* inode involved in last error */ 1407 __le32 s_last_error_line; /* line number where error happened */ 1408 __le64 s_last_error_block; /* block involved of last error */ 1409 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */ 1410 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1411 __u8 s_mount_opts[64]; 1412 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1413 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1414 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1415 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1416 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1417 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1418 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1419 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1420 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1421 __u8 s_wtime_hi; 1422 __u8 s_mtime_hi; 1423 __u8 s_mkfs_time_hi; 1424 __u8 s_lastcheck_hi; 1425 __u8 s_first_error_time_hi; 1426 __u8 s_last_error_time_hi; 1427 __u8 s_first_error_errcode; 1428 __u8 s_last_error_errcode; 1429 __le16 s_encoding; /* Filename charset encoding */ 1430 __le16 s_encoding_flags; /* Filename charset encoding flags */ 1431 __le32 s_reserved[95]; /* Padding to the end of the block */ 1432 __le32 s_checksum; /* crc32c(superblock) */ 1433 }; 1434 1435 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1436 1437 #ifdef __KERNEL__ 1438 1439 #ifdef CONFIG_FS_ENCRYPTION 1440 #define DUMMY_ENCRYPTION_ENABLED(sbi) ((sbi)->s_dummy_enc_policy.policy != NULL) 1441 #else 1442 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0) 1443 #endif 1444 1445 /* Number of quota types we support */ 1446 #define EXT4_MAXQUOTAS 3 1447 1448 #define EXT4_ENC_UTF8_12_1 1 1449 1450 /* 1451 * fourth extended-fs super-block data in memory 1452 */ 1453 struct ext4_sb_info { 1454 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1455 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1456 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1457 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1458 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1459 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1460 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1461 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1462 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1463 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1464 unsigned long s_overhead; /* # of fs overhead clusters */ 1465 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1466 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1467 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1468 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1469 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1470 struct buffer_head * __rcu *s_group_desc; 1471 unsigned int s_mount_opt; 1472 unsigned int s_mount_opt2; 1473 unsigned long s_mount_flags; 1474 unsigned int s_def_mount_opt; 1475 ext4_fsblk_t s_sb_block; 1476 atomic64_t s_resv_clusters; 1477 kuid_t s_resuid; 1478 kgid_t s_resgid; 1479 unsigned short s_mount_state; 1480 unsigned short s_pad; 1481 int s_addr_per_block_bits; 1482 int s_desc_per_block_bits; 1483 int s_inode_size; 1484 int s_first_ino; 1485 unsigned int s_inode_readahead_blks; 1486 unsigned int s_inode_goal; 1487 u32 s_hash_seed[4]; 1488 int s_def_hash_version; 1489 int s_hash_unsigned; /* 3 if hash should be unsigned, 0 if not */ 1490 struct percpu_counter s_freeclusters_counter; 1491 struct percpu_counter s_freeinodes_counter; 1492 struct percpu_counter s_dirs_counter; 1493 struct percpu_counter s_dirtyclusters_counter; 1494 struct percpu_counter s_sra_exceeded_retry_limit; 1495 struct blockgroup_lock *s_blockgroup_lock; 1496 struct proc_dir_entry *s_proc; 1497 struct kobject s_kobj; 1498 struct completion s_kobj_unregister; 1499 struct super_block *s_sb; 1500 struct buffer_head *s_mmp_bh; 1501 1502 /* Journaling */ 1503 struct journal_s *s_journal; 1504 struct list_head s_orphan; 1505 struct mutex s_orphan_lock; 1506 unsigned long s_ext4_flags; /* Ext4 superblock flags */ 1507 unsigned long s_commit_interval; 1508 u32 s_max_batch_time; 1509 u32 s_min_batch_time; 1510 struct block_device *s_journal_bdev; 1511 #ifdef CONFIG_QUOTA 1512 /* Names of quota files with journalled quota */ 1513 char __rcu *s_qf_names[EXT4_MAXQUOTAS]; 1514 int s_jquota_fmt; /* Format of quota to use */ 1515 #endif 1516 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1517 struct ext4_system_blocks __rcu *s_system_blks; 1518 1519 #ifdef EXTENTS_STATS 1520 /* ext4 extents stats */ 1521 unsigned long s_ext_min; 1522 unsigned long s_ext_max; 1523 unsigned long s_depth_max; 1524 spinlock_t s_ext_stats_lock; 1525 unsigned long s_ext_blocks; 1526 unsigned long s_ext_extents; 1527 #endif 1528 1529 /* for buddy allocator */ 1530 struct ext4_group_info ** __rcu *s_group_info; 1531 struct inode *s_buddy_cache; 1532 spinlock_t s_md_lock; 1533 unsigned short *s_mb_offsets; 1534 unsigned int *s_mb_maxs; 1535 unsigned int s_group_info_size; 1536 unsigned int s_mb_free_pending; 1537 struct list_head s_freed_data_list; /* List of blocks to be freed 1538 after commit completed */ 1539 struct list_head s_discard_list; 1540 struct work_struct s_discard_work; 1541 atomic_t s_retry_alloc_pending; 1542 struct rb_root s_mb_avg_fragment_size_root; 1543 rwlock_t s_mb_rb_lock; 1544 struct list_head *s_mb_largest_free_orders; 1545 rwlock_t *s_mb_largest_free_orders_locks; 1546 1547 /* tunables */ 1548 unsigned long s_stripe; 1549 unsigned int s_mb_max_linear_groups; 1550 unsigned int s_mb_stream_request; 1551 unsigned int s_mb_max_to_scan; 1552 unsigned int s_mb_min_to_scan; 1553 unsigned int s_mb_stats; 1554 unsigned int s_mb_order2_reqs; 1555 unsigned int s_mb_group_prealloc; 1556 unsigned int s_mb_max_inode_prealloc; 1557 unsigned int s_max_dir_size_kb; 1558 /* where last allocation was done - for stream allocation */ 1559 unsigned long s_mb_last_group; 1560 unsigned long s_mb_last_start; 1561 unsigned int s_mb_prefetch; 1562 unsigned int s_mb_prefetch_limit; 1563 1564 /* stats for buddy allocator */ 1565 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1566 atomic_t s_bal_success; /* we found long enough chunks */ 1567 atomic_t s_bal_allocated; /* in blocks */ 1568 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1569 atomic_t s_bal_groups_scanned; /* number of groups scanned */ 1570 atomic_t s_bal_goals; /* goal hits */ 1571 atomic_t s_bal_breaks; /* too long searches */ 1572 atomic_t s_bal_2orders; /* 2^order hits */ 1573 atomic_t s_bal_cr0_bad_suggestions; 1574 atomic_t s_bal_cr1_bad_suggestions; 1575 atomic64_t s_bal_cX_groups_considered[4]; 1576 atomic64_t s_bal_cX_hits[4]; 1577 atomic64_t s_bal_cX_failed[4]; /* cX loop didn't find blocks */ 1578 atomic_t s_mb_buddies_generated; /* number of buddies generated */ 1579 atomic64_t s_mb_generation_time; 1580 atomic_t s_mb_lost_chunks; 1581 atomic_t s_mb_preallocated; 1582 atomic_t s_mb_discarded; 1583 atomic_t s_lock_busy; 1584 1585 /* locality groups */ 1586 struct ext4_locality_group __percpu *s_locality_groups; 1587 1588 /* for write statistics */ 1589 unsigned long s_sectors_written_start; 1590 u64 s_kbytes_written; 1591 1592 /* the size of zero-out chunk */ 1593 unsigned int s_extent_max_zeroout_kb; 1594 1595 unsigned int s_log_groups_per_flex; 1596 struct flex_groups * __rcu *s_flex_groups; 1597 ext4_group_t s_flex_groups_allocated; 1598 1599 /* workqueue for reserved extent conversions (buffered io) */ 1600 struct workqueue_struct *rsv_conversion_wq; 1601 1602 /* timer for periodic error stats printing */ 1603 struct timer_list s_err_report; 1604 1605 /* Lazy inode table initialization info */ 1606 struct ext4_li_request *s_li_request; 1607 /* Wait multiplier for lazy initialization thread */ 1608 unsigned int s_li_wait_mult; 1609 1610 /* Kernel thread for multiple mount protection */ 1611 struct task_struct *s_mmp_tsk; 1612 1613 /* record the last minlen when FITRIM is called. */ 1614 atomic_t s_last_trim_minblks; 1615 1616 /* Reference to checksum algorithm driver via cryptoapi */ 1617 struct crypto_shash *s_chksum_driver; 1618 1619 /* Precomputed FS UUID checksum for seeding other checksums */ 1620 __u32 s_csum_seed; 1621 1622 /* Reclaim extents from extent status tree */ 1623 struct shrinker s_es_shrinker; 1624 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1625 long s_es_nr_inode; 1626 struct ext4_es_stats s_es_stats; 1627 struct mb_cache *s_ea_block_cache; 1628 struct mb_cache *s_ea_inode_cache; 1629 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1630 1631 /* Ratelimit ext4 messages. */ 1632 struct ratelimit_state s_err_ratelimit_state; 1633 struct ratelimit_state s_warning_ratelimit_state; 1634 struct ratelimit_state s_msg_ratelimit_state; 1635 atomic_t s_warning_count; 1636 atomic_t s_msg_count; 1637 1638 /* Encryption policy for '-o test_dummy_encryption' */ 1639 struct fscrypt_dummy_policy s_dummy_enc_policy; 1640 1641 /* 1642 * Barrier between writepages ops and changing any inode's JOURNAL_DATA 1643 * or EXTENTS flag. 1644 */ 1645 struct percpu_rw_semaphore s_writepages_rwsem; 1646 struct dax_device *s_daxdev; 1647 #ifdef CONFIG_EXT4_DEBUG 1648 unsigned long s_simulate_fail; 1649 #endif 1650 /* Record the errseq of the backing block device */ 1651 errseq_t s_bdev_wb_err; 1652 spinlock_t s_bdev_wb_lock; 1653 1654 /* Information about errors that happened during this mount */ 1655 spinlock_t s_error_lock; 1656 int s_add_error_count; 1657 int s_first_error_code; 1658 __u32 s_first_error_line; 1659 __u32 s_first_error_ino; 1660 __u64 s_first_error_block; 1661 const char *s_first_error_func; 1662 time64_t s_first_error_time; 1663 int s_last_error_code; 1664 __u32 s_last_error_line; 1665 __u32 s_last_error_ino; 1666 __u64 s_last_error_block; 1667 const char *s_last_error_func; 1668 time64_t s_last_error_time; 1669 /* 1670 * If we are in a context where we cannot update error information in 1671 * the on-disk superblock, we queue this work to do it. 1672 */ 1673 struct work_struct s_error_work; 1674 1675 /* Ext4 fast commit stuff */ 1676 atomic_t s_fc_subtid; 1677 atomic_t s_fc_ineligible_updates; 1678 /* 1679 * After commit starts, the main queue gets locked, and the further 1680 * updates get added in the staging queue. 1681 */ 1682 #define FC_Q_MAIN 0 1683 #define FC_Q_STAGING 1 1684 struct list_head s_fc_q[2]; /* Inodes staged for fast commit 1685 * that have data changes in them. 1686 */ 1687 struct list_head s_fc_dentry_q[2]; /* directory entry updates */ 1688 unsigned int s_fc_bytes; 1689 /* 1690 * Main fast commit lock. This lock protects accesses to the 1691 * following fields: 1692 * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh. 1693 */ 1694 spinlock_t s_fc_lock; 1695 struct buffer_head *s_fc_bh; 1696 struct ext4_fc_stats s_fc_stats; 1697 u64 s_fc_avg_commit_time; 1698 #ifdef CONFIG_EXT4_DEBUG 1699 int s_fc_debug_max_replay; 1700 #endif 1701 struct ext4_fc_replay_state s_fc_replay_state; 1702 }; 1703 1704 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1705 { 1706 return sb->s_fs_info; 1707 } 1708 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1709 { 1710 return container_of(inode, struct ext4_inode_info, vfs_inode); 1711 } 1712 1713 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1714 { 1715 return ino == EXT4_ROOT_INO || 1716 (ino >= EXT4_FIRST_INO(sb) && 1717 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1718 } 1719 1720 /* 1721 * Returns: sbi->field[index] 1722 * Used to access an array element from the following sbi fields which require 1723 * rcu protection to avoid dereferencing an invalid pointer due to reassignment 1724 * - s_group_desc 1725 * - s_group_info 1726 * - s_flex_group 1727 */ 1728 #define sbi_array_rcu_deref(sbi, field, index) \ 1729 ({ \ 1730 typeof(*((sbi)->field)) _v; \ 1731 rcu_read_lock(); \ 1732 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \ 1733 rcu_read_unlock(); \ 1734 _v; \ 1735 }) 1736 1737 /* 1738 * run-time mount flags 1739 */ 1740 enum { 1741 EXT4_MF_MNTDIR_SAMPLED, 1742 EXT4_MF_FS_ABORTED, /* Fatal error detected */ 1743 EXT4_MF_FC_INELIGIBLE, /* Fast commit ineligible */ 1744 EXT4_MF_FC_COMMITTING /* File system underoing a fast 1745 * commit. 1746 */ 1747 }; 1748 1749 static inline void ext4_set_mount_flag(struct super_block *sb, int bit) 1750 { 1751 set_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1752 } 1753 1754 static inline void ext4_clear_mount_flag(struct super_block *sb, int bit) 1755 { 1756 clear_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1757 } 1758 1759 static inline int ext4_test_mount_flag(struct super_block *sb, int bit) 1760 { 1761 return test_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1762 } 1763 1764 1765 /* 1766 * Simulate_fail codes 1767 */ 1768 #define EXT4_SIM_BBITMAP_EIO 1 1769 #define EXT4_SIM_BBITMAP_CRC 2 1770 #define EXT4_SIM_IBITMAP_EIO 3 1771 #define EXT4_SIM_IBITMAP_CRC 4 1772 #define EXT4_SIM_INODE_EIO 5 1773 #define EXT4_SIM_INODE_CRC 6 1774 #define EXT4_SIM_DIRBLOCK_EIO 7 1775 #define EXT4_SIM_DIRBLOCK_CRC 8 1776 1777 static inline bool ext4_simulate_fail(struct super_block *sb, 1778 unsigned long code) 1779 { 1780 #ifdef CONFIG_EXT4_DEBUG 1781 struct ext4_sb_info *sbi = EXT4_SB(sb); 1782 1783 if (unlikely(sbi->s_simulate_fail == code)) { 1784 sbi->s_simulate_fail = 0; 1785 return true; 1786 } 1787 #endif 1788 return false; 1789 } 1790 1791 static inline void ext4_simulate_fail_bh(struct super_block *sb, 1792 struct buffer_head *bh, 1793 unsigned long code) 1794 { 1795 if (!IS_ERR(bh) && ext4_simulate_fail(sb, code)) 1796 clear_buffer_uptodate(bh); 1797 } 1798 1799 /* 1800 * Error number codes for s_{first,last}_error_errno 1801 * 1802 * Linux errno numbers are architecture specific, so we need to translate 1803 * them into something which is architecture independent. We don't define 1804 * codes for all errno's; just the ones which are most likely to be the cause 1805 * of an ext4_error() call. 1806 */ 1807 #define EXT4_ERR_UNKNOWN 1 1808 #define EXT4_ERR_EIO 2 1809 #define EXT4_ERR_ENOMEM 3 1810 #define EXT4_ERR_EFSBADCRC 4 1811 #define EXT4_ERR_EFSCORRUPTED 5 1812 #define EXT4_ERR_ENOSPC 6 1813 #define EXT4_ERR_ENOKEY 7 1814 #define EXT4_ERR_EROFS 8 1815 #define EXT4_ERR_EFBIG 9 1816 #define EXT4_ERR_EEXIST 10 1817 #define EXT4_ERR_ERANGE 11 1818 #define EXT4_ERR_EOVERFLOW 12 1819 #define EXT4_ERR_EBUSY 13 1820 #define EXT4_ERR_ENOTDIR 14 1821 #define EXT4_ERR_ENOTEMPTY 15 1822 #define EXT4_ERR_ESHUTDOWN 16 1823 #define EXT4_ERR_EFAULT 17 1824 1825 /* 1826 * Inode dynamic state flags 1827 */ 1828 enum { 1829 EXT4_STATE_JDATA, /* journaled data exists */ 1830 EXT4_STATE_NEW, /* inode is newly created */ 1831 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1832 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1833 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1834 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1835 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1836 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1837 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1838 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */ 1839 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */ 1840 EXT4_STATE_FC_COMMITTING, /* Fast commit ongoing */ 1841 }; 1842 1843 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1844 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1845 { \ 1846 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1847 } \ 1848 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1849 { \ 1850 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1851 } \ 1852 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1853 { \ 1854 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1855 } 1856 1857 /* Add these declarations here only so that these functions can be 1858 * found by name. Otherwise, they are very hard to locate. */ 1859 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1860 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1861 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1862 EXT4_INODE_BIT_FNS(flag, flags, 0) 1863 1864 /* Add these declarations here only so that these functions can be 1865 * found by name. Otherwise, they are very hard to locate. */ 1866 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1867 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1868 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1869 #if (BITS_PER_LONG < 64) 1870 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1871 1872 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1873 { 1874 (ei)->i_state_flags = 0; 1875 } 1876 #else 1877 EXT4_INODE_BIT_FNS(state, flags, 32) 1878 1879 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1880 { 1881 /* We depend on the fact that callers will set i_flags */ 1882 } 1883 #endif 1884 #else 1885 /* Assume that user mode programs are passing in an ext4fs superblock, not 1886 * a kernel struct super_block. This will allow us to call the feature-test 1887 * macros from user land. */ 1888 #define EXT4_SB(sb) (sb) 1889 #endif 1890 1891 static inline bool ext4_verity_in_progress(struct inode *inode) 1892 { 1893 return IS_ENABLED(CONFIG_FS_VERITY) && 1894 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS); 1895 } 1896 1897 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1898 1899 /* 1900 * Codes for operating systems 1901 */ 1902 #define EXT4_OS_LINUX 0 1903 #define EXT4_OS_HURD 1 1904 #define EXT4_OS_MASIX 2 1905 #define EXT4_OS_FREEBSD 3 1906 #define EXT4_OS_LITES 4 1907 1908 /* 1909 * Revision levels 1910 */ 1911 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1912 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1913 1914 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1915 1916 #define EXT4_GOOD_OLD_INODE_SIZE 128 1917 1918 #define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN) 1919 #define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX 1920 #define EXT4_TIMESTAMP_MIN S32_MIN 1921 1922 /* 1923 * Feature set definitions 1924 */ 1925 1926 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1927 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1928 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1929 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1930 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1931 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1932 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1933 /* 1934 * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes 1935 * incompatible only if fast commit blocks are present in the FS. Since we 1936 * clear the journal (and thus the fast commit blocks), we don't mark FS as 1937 * incompatible. We also have a JBD2 incompat feature, which gets set when 1938 * there are fast commit blocks present in the journal. 1939 */ 1940 #define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400 1941 #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800 1942 1943 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1944 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1945 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1946 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1947 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1948 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1949 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1950 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1951 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1952 /* 1953 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1954 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1955 * all other data structures' checksums. However, the METADATA_CSUM and 1956 * GDT_CSUM bits are mutually exclusive. 1957 */ 1958 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1959 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1960 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 1961 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000 1962 1963 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1964 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1965 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1966 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1967 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1968 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1969 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1970 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1971 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1972 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1973 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1974 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 1975 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1976 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1977 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1978 #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000 1979 1980 extern void ext4_update_dynamic_rev(struct super_block *sb); 1981 1982 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 1983 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1984 { \ 1985 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1986 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 1987 } \ 1988 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1989 { \ 1990 ext4_update_dynamic_rev(sb); \ 1991 EXT4_SB(sb)->s_es->s_feature_compat |= \ 1992 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1993 } \ 1994 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1995 { \ 1996 EXT4_SB(sb)->s_es->s_feature_compat &= \ 1997 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1998 } 1999 2000 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 2001 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 2002 { \ 2003 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 2004 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 2005 } \ 2006 static inline void ext4_set_feature_##name(struct super_block *sb) \ 2007 { \ 2008 ext4_update_dynamic_rev(sb); \ 2009 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 2010 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 2011 } \ 2012 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 2013 { \ 2014 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 2015 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 2016 } 2017 2018 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 2019 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 2020 { \ 2021 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 2022 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 2023 } \ 2024 static inline void ext4_set_feature_##name(struct super_block *sb) \ 2025 { \ 2026 ext4_update_dynamic_rev(sb); \ 2027 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 2028 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 2029 } \ 2030 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 2031 { \ 2032 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 2033 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 2034 } 2035 2036 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 2037 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 2038 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 2039 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 2040 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 2041 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 2042 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 2043 EXT4_FEATURE_COMPAT_FUNCS(fast_commit, FAST_COMMIT) 2044 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES) 2045 2046 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 2047 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 2048 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 2049 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 2050 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 2051 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 2052 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 2053 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 2054 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 2055 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 2056 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 2057 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 2058 EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY) 2059 2060 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 2061 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 2062 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 2063 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 2064 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 2065 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 2066 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 2067 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 2068 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 2069 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 2070 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 2071 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 2072 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 2073 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 2074 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 2075 EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD) 2076 2077 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2078 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2079 EXT4_FEATURE_INCOMPAT_META_BG) 2080 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2081 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2082 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 2083 2084 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2085 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2086 EXT4_FEATURE_INCOMPAT_RECOVER| \ 2087 EXT4_FEATURE_INCOMPAT_META_BG) 2088 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2089 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2090 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 2091 2092 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2093 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2094 EXT4_FEATURE_INCOMPAT_RECOVER| \ 2095 EXT4_FEATURE_INCOMPAT_META_BG| \ 2096 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 2097 EXT4_FEATURE_INCOMPAT_64BIT| \ 2098 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 2099 EXT4_FEATURE_INCOMPAT_EA_INODE| \ 2100 EXT4_FEATURE_INCOMPAT_MMP | \ 2101 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 2102 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 2103 EXT4_FEATURE_INCOMPAT_CASEFOLD | \ 2104 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \ 2105 EXT4_FEATURE_INCOMPAT_LARGEDIR) 2106 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2107 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2108 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 2109 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 2110 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 2111 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 2112 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 2113 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 2114 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 2115 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 2116 EXT4_FEATURE_RO_COMPAT_PROJECT |\ 2117 EXT4_FEATURE_RO_COMPAT_VERITY) 2118 2119 #define EXTN_FEATURE_FUNCS(ver) \ 2120 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 2121 { \ 2122 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 2123 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 2124 } \ 2125 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 2126 { \ 2127 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 2128 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 2129 } \ 2130 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 2131 { \ 2132 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 2133 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 2134 } 2135 2136 EXTN_FEATURE_FUNCS(2) 2137 EXTN_FEATURE_FUNCS(3) 2138 EXTN_FEATURE_FUNCS(4) 2139 2140 static inline bool ext4_has_compat_features(struct super_block *sb) 2141 { 2142 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 2143 } 2144 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 2145 { 2146 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 2147 } 2148 static inline bool ext4_has_incompat_features(struct super_block *sb) 2149 { 2150 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 2151 } 2152 2153 /* 2154 * Superblock flags 2155 */ 2156 #define EXT4_FLAGS_RESIZING 0 2157 #define EXT4_FLAGS_SHUTDOWN 1 2158 #define EXT4_FLAGS_BDEV_IS_DAX 2 2159 2160 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi) 2161 { 2162 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 2163 } 2164 2165 2166 /* 2167 * Default values for user and/or group using reserved blocks 2168 */ 2169 #define EXT4_DEF_RESUID 0 2170 #define EXT4_DEF_RESGID 0 2171 2172 /* 2173 * Default project ID 2174 */ 2175 #define EXT4_DEF_PROJID 0 2176 2177 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 2178 2179 /* 2180 * Default mount options 2181 */ 2182 #define EXT4_DEFM_DEBUG 0x0001 2183 #define EXT4_DEFM_BSDGROUPS 0x0002 2184 #define EXT4_DEFM_XATTR_USER 0x0004 2185 #define EXT4_DEFM_ACL 0x0008 2186 #define EXT4_DEFM_UID16 0x0010 2187 #define EXT4_DEFM_JMODE 0x0060 2188 #define EXT4_DEFM_JMODE_DATA 0x0020 2189 #define EXT4_DEFM_JMODE_ORDERED 0x0040 2190 #define EXT4_DEFM_JMODE_WBACK 0x0060 2191 #define EXT4_DEFM_NOBARRIER 0x0100 2192 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 2193 #define EXT4_DEFM_DISCARD 0x0400 2194 #define EXT4_DEFM_NODELALLOC 0x0800 2195 2196 /* 2197 * Default journal batch times 2198 */ 2199 #define EXT4_DEF_MIN_BATCH_TIME 0 2200 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 2201 2202 /* 2203 * Minimum number of groups in a flexgroup before we separate out 2204 * directories into the first block group of a flexgroup 2205 */ 2206 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 2207 2208 /* 2209 * Structure of a directory entry 2210 */ 2211 #define EXT4_NAME_LEN 255 2212 2213 struct ext4_dir_entry { 2214 __le32 inode; /* Inode number */ 2215 __le16 rec_len; /* Directory entry length */ 2216 __le16 name_len; /* Name length */ 2217 char name[EXT4_NAME_LEN]; /* File name */ 2218 }; 2219 2220 2221 /* 2222 * Encrypted Casefolded entries require saving the hash on disk. This structure 2223 * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned 2224 * boundary. 2225 */ 2226 struct ext4_dir_entry_hash { 2227 __le32 hash; 2228 __le32 minor_hash; 2229 }; 2230 2231 /* 2232 * The new version of the directory entry. Since EXT4 structures are 2233 * stored in intel byte order, and the name_len field could never be 2234 * bigger than 255 chars, it's safe to reclaim the extra byte for the 2235 * file_type field. 2236 */ 2237 struct ext4_dir_entry_2 { 2238 __le32 inode; /* Inode number */ 2239 __le16 rec_len; /* Directory entry length */ 2240 __u8 name_len; /* Name length */ 2241 __u8 file_type; /* See file type macros EXT4_FT_* below */ 2242 char name[EXT4_NAME_LEN]; /* File name */ 2243 }; 2244 2245 /* 2246 * Access the hashes at the end of ext4_dir_entry_2 2247 */ 2248 #define EXT4_DIRENT_HASHES(entry) \ 2249 ((struct ext4_dir_entry_hash *) \ 2250 (((void *)(entry)) + \ 2251 ((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND))) 2252 #define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(de)->hash) 2253 #define EXT4_DIRENT_MINOR_HASH(entry) \ 2254 le32_to_cpu(EXT4_DIRENT_HASHES(de)->minor_hash) 2255 2256 static inline bool ext4_hash_in_dirent(const struct inode *inode) 2257 { 2258 return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode); 2259 } 2260 2261 /* 2262 * This is a bogus directory entry at the end of each leaf block that 2263 * records checksums. 2264 */ 2265 struct ext4_dir_entry_tail { 2266 __le32 det_reserved_zero1; /* Pretend to be unused */ 2267 __le16 det_rec_len; /* 12 */ 2268 __u8 det_reserved_zero2; /* Zero name length */ 2269 __u8 det_reserved_ft; /* 0xDE, fake file type */ 2270 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 2271 }; 2272 2273 #define EXT4_DIRENT_TAIL(block, blocksize) \ 2274 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 2275 ((blocksize) - \ 2276 sizeof(struct ext4_dir_entry_tail)))) 2277 2278 /* 2279 * Ext4 directory file types. Only the low 3 bits are used. The 2280 * other bits are reserved for now. 2281 */ 2282 #define EXT4_FT_UNKNOWN 0 2283 #define EXT4_FT_REG_FILE 1 2284 #define EXT4_FT_DIR 2 2285 #define EXT4_FT_CHRDEV 3 2286 #define EXT4_FT_BLKDEV 4 2287 #define EXT4_FT_FIFO 5 2288 #define EXT4_FT_SOCK 6 2289 #define EXT4_FT_SYMLINK 7 2290 2291 #define EXT4_FT_MAX 8 2292 2293 #define EXT4_FT_DIR_CSUM 0xDE 2294 2295 /* 2296 * EXT4_DIR_PAD defines the directory entries boundaries 2297 * 2298 * NOTE: It must be a multiple of 4 2299 */ 2300 #define EXT4_DIR_PAD 4 2301 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 2302 #define EXT4_MAX_REC_LEN ((1<<16)-1) 2303 2304 /* 2305 * The rec_len is dependent on the type of directory. Directories that are 2306 * casefolded and encrypted need to store the hash as well, so we add room for 2307 * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should 2308 * pass NULL for dir, as those entries do not use the extra fields. 2309 */ 2310 static inline unsigned int ext4_dir_rec_len(__u8 name_len, 2311 const struct inode *dir) 2312 { 2313 int rec_len = (name_len + 8 + EXT4_DIR_ROUND); 2314 2315 if (dir && ext4_hash_in_dirent(dir)) 2316 rec_len += sizeof(struct ext4_dir_entry_hash); 2317 return (rec_len & ~EXT4_DIR_ROUND); 2318 } 2319 2320 /* 2321 * If we ever get support for fs block sizes > page_size, we'll need 2322 * to remove the #if statements in the next two functions... 2323 */ 2324 static inline unsigned int 2325 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 2326 { 2327 unsigned len = le16_to_cpu(dlen); 2328 2329 #if (PAGE_SIZE >= 65536) 2330 if (len == EXT4_MAX_REC_LEN || len == 0) 2331 return blocksize; 2332 return (len & 65532) | ((len & 3) << 16); 2333 #else 2334 return len; 2335 #endif 2336 } 2337 2338 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 2339 { 2340 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 2341 BUG(); 2342 #if (PAGE_SIZE >= 65536) 2343 if (len < 65536) 2344 return cpu_to_le16(len); 2345 if (len == blocksize) { 2346 if (blocksize == 65536) 2347 return cpu_to_le16(EXT4_MAX_REC_LEN); 2348 else 2349 return cpu_to_le16(0); 2350 } 2351 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 2352 #else 2353 return cpu_to_le16(len); 2354 #endif 2355 } 2356 2357 /* 2358 * Hash Tree Directory indexing 2359 * (c) Daniel Phillips, 2001 2360 */ 2361 2362 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2363 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2364 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \ 2365 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir))) 2366 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2367 2368 /* Legal values for the dx_root hash_version field: */ 2369 2370 #define DX_HASH_LEGACY 0 2371 #define DX_HASH_HALF_MD4 1 2372 #define DX_HASH_TEA 2 2373 #define DX_HASH_LEGACY_UNSIGNED 3 2374 #define DX_HASH_HALF_MD4_UNSIGNED 4 2375 #define DX_HASH_TEA_UNSIGNED 5 2376 #define DX_HASH_SIPHASH 6 2377 2378 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 2379 const void *address, unsigned int length) 2380 { 2381 struct { 2382 struct shash_desc shash; 2383 char ctx[4]; 2384 } desc; 2385 2386 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2387 2388 desc.shash.tfm = sbi->s_chksum_driver; 2389 *(u32 *)desc.ctx = crc; 2390 2391 BUG_ON(crypto_shash_update(&desc.shash, address, length)); 2392 2393 return *(u32 *)desc.ctx; 2394 } 2395 2396 #ifdef __KERNEL__ 2397 2398 /* hash info structure used by the directory hash */ 2399 struct dx_hash_info 2400 { 2401 u32 hash; 2402 u32 minor_hash; 2403 int hash_version; 2404 u32 *seed; 2405 }; 2406 2407 2408 /* 32 and 64 bit signed EOF for dx directories */ 2409 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2410 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2411 2412 2413 /* 2414 * Control parameters used by ext4_htree_next_block 2415 */ 2416 #define HASH_NB_ALWAYS 1 2417 2418 struct ext4_filename { 2419 const struct qstr *usr_fname; 2420 struct fscrypt_str disk_name; 2421 struct dx_hash_info hinfo; 2422 #ifdef CONFIG_FS_ENCRYPTION 2423 struct fscrypt_str crypto_buf; 2424 #endif 2425 #ifdef CONFIG_UNICODE 2426 struct fscrypt_str cf_name; 2427 #endif 2428 }; 2429 2430 #define fname_name(p) ((p)->disk_name.name) 2431 #define fname_usr_name(p) ((p)->usr_fname->name) 2432 #define fname_len(p) ((p)->disk_name.len) 2433 2434 /* 2435 * Describe an inode's exact location on disk and in memory 2436 */ 2437 struct ext4_iloc 2438 { 2439 struct buffer_head *bh; 2440 unsigned long offset; 2441 ext4_group_t block_group; 2442 }; 2443 2444 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2445 { 2446 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2447 } 2448 2449 static inline bool ext4_is_quota_file(struct inode *inode) 2450 { 2451 return IS_NOQUOTA(inode) && 2452 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL); 2453 } 2454 2455 /* 2456 * This structure is stuffed into the struct file's private_data field 2457 * for directories. It is where we put information so that we can do 2458 * readdir operations in hash tree order. 2459 */ 2460 struct dir_private_info { 2461 struct rb_root root; 2462 struct rb_node *curr_node; 2463 struct fname *extra_fname; 2464 loff_t last_pos; 2465 __u32 curr_hash; 2466 __u32 curr_minor_hash; 2467 __u32 next_hash; 2468 }; 2469 2470 /* calculate the first block number of the group */ 2471 static inline ext4_fsblk_t 2472 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2473 { 2474 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2475 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2476 } 2477 2478 /* 2479 * Special error return code only used by dx_probe() and its callers. 2480 */ 2481 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2482 2483 /* htree levels for ext4 */ 2484 #define EXT4_HTREE_LEVEL_COMPAT 2 2485 #define EXT4_HTREE_LEVEL 3 2486 2487 static inline int ext4_dir_htree_level(struct super_block *sb) 2488 { 2489 return ext4_has_feature_largedir(sb) ? 2490 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT; 2491 } 2492 2493 /* 2494 * Timeout and state flag for lazy initialization inode thread. 2495 */ 2496 #define EXT4_DEF_LI_WAIT_MULT 10 2497 #define EXT4_DEF_LI_MAX_START_DELAY 5 2498 #define EXT4_LAZYINIT_QUIT 0x0001 2499 #define EXT4_LAZYINIT_RUNNING 0x0002 2500 2501 /* 2502 * Lazy inode table initialization info 2503 */ 2504 struct ext4_lazy_init { 2505 unsigned long li_state; 2506 struct list_head li_request_list; 2507 struct mutex li_list_mtx; 2508 }; 2509 2510 enum ext4_li_mode { 2511 EXT4_LI_MODE_PREFETCH_BBITMAP, 2512 EXT4_LI_MODE_ITABLE, 2513 }; 2514 2515 struct ext4_li_request { 2516 struct super_block *lr_super; 2517 enum ext4_li_mode lr_mode; 2518 ext4_group_t lr_first_not_zeroed; 2519 ext4_group_t lr_next_group; 2520 struct list_head lr_request; 2521 unsigned long lr_next_sched; 2522 unsigned long lr_timeout; 2523 }; 2524 2525 struct ext4_features { 2526 struct kobject f_kobj; 2527 struct completion f_kobj_unregister; 2528 }; 2529 2530 /* 2531 * This structure will be used for multiple mount protection. It will be 2532 * written into the block number saved in the s_mmp_block field in the 2533 * superblock. Programs that check MMP should assume that if 2534 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2535 * to use the filesystem, regardless of how old the timestamp is. 2536 */ 2537 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2538 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2539 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2540 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2541 2542 struct mmp_struct { 2543 __le32 mmp_magic; /* Magic number for MMP */ 2544 __le32 mmp_seq; /* Sequence no. updated periodically */ 2545 2546 /* 2547 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2548 * purposes and do not affect the correctness of the algorithm 2549 */ 2550 __le64 mmp_time; /* Time last updated */ 2551 char mmp_nodename[64]; /* Node which last updated MMP block */ 2552 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2553 2554 /* 2555 * mmp_check_interval is used to verify if the MMP block has been 2556 * updated on the block device. The value is updated based on the 2557 * maximum time to write the MMP block during an update cycle. 2558 */ 2559 __le16 mmp_check_interval; 2560 2561 __le16 mmp_pad1; 2562 __le32 mmp_pad2[226]; 2563 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2564 }; 2565 2566 /* arguments passed to the mmp thread */ 2567 struct mmpd_data { 2568 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2569 struct super_block *sb; /* super block of the fs */ 2570 }; 2571 2572 /* 2573 * Check interval multiplier 2574 * The MMP block is written every update interval and initially checked every 2575 * update interval x the multiplier (the value is then adapted based on the 2576 * write latency). The reason is that writes can be delayed under load and we 2577 * don't want readers to incorrectly assume that the filesystem is no longer 2578 * in use. 2579 */ 2580 #define EXT4_MMP_CHECK_MULT 2UL 2581 2582 /* 2583 * Minimum interval for MMP checking in seconds. 2584 */ 2585 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2586 2587 /* 2588 * Maximum interval for MMP checking in seconds. 2589 */ 2590 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2591 2592 /* 2593 * Function prototypes 2594 */ 2595 2596 /* 2597 * Ok, these declarations are also in <linux/kernel.h> but none of the 2598 * ext4 source programs needs to include it so they are duplicated here. 2599 */ 2600 # define NORET_TYPE /**/ 2601 # define ATTRIB_NORET __attribute__((noreturn)) 2602 # define NORET_AND noreturn, 2603 2604 /* bitmap.c */ 2605 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2606 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2607 struct ext4_group_desc *gdp, 2608 struct buffer_head *bh, int sz); 2609 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2610 struct ext4_group_desc *gdp, 2611 struct buffer_head *bh, int sz); 2612 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2613 struct ext4_group_desc *gdp, 2614 struct buffer_head *bh); 2615 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2616 struct ext4_group_desc *gdp, 2617 struct buffer_head *bh); 2618 2619 /* balloc.c */ 2620 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2621 ext4_fsblk_t blocknr, 2622 ext4_group_t *blockgrpp, 2623 ext4_grpblk_t *offsetp); 2624 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2625 ext4_fsblk_t block); 2626 2627 extern unsigned int ext4_block_group(struct super_block *sb, 2628 ext4_fsblk_t blocknr); 2629 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2630 ext4_fsblk_t blocknr); 2631 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2632 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2633 ext4_group_t group); 2634 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2635 ext4_fsblk_t goal, 2636 unsigned int flags, 2637 unsigned long *count, 2638 int *errp); 2639 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2640 s64 nclusters, unsigned int flags); 2641 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2642 extern void ext4_check_blocks_bitmap(struct super_block *); 2643 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2644 ext4_group_t block_group, 2645 struct buffer_head ** bh); 2646 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2647 2648 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2649 ext4_group_t block_group, 2650 bool ignore_locked); 2651 extern int ext4_wait_block_bitmap(struct super_block *sb, 2652 ext4_group_t block_group, 2653 struct buffer_head *bh); 2654 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2655 ext4_group_t block_group); 2656 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2657 ext4_group_t block_group, 2658 struct ext4_group_desc *gdp); 2659 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2660 2661 #ifdef CONFIG_UNICODE 2662 extern int ext4_fname_setup_ci_filename(struct inode *dir, 2663 const struct qstr *iname, 2664 struct ext4_filename *fname); 2665 #endif 2666 2667 #ifdef CONFIG_FS_ENCRYPTION 2668 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst, 2669 const struct fscrypt_name *src) 2670 { 2671 memset(dst, 0, sizeof(*dst)); 2672 2673 dst->usr_fname = src->usr_fname; 2674 dst->disk_name = src->disk_name; 2675 dst->hinfo.hash = src->hash; 2676 dst->hinfo.minor_hash = src->minor_hash; 2677 dst->crypto_buf = src->crypto_buf; 2678 } 2679 2680 static inline int ext4_fname_setup_filename(struct inode *dir, 2681 const struct qstr *iname, 2682 int lookup, 2683 struct ext4_filename *fname) 2684 { 2685 struct fscrypt_name name; 2686 int err; 2687 2688 err = fscrypt_setup_filename(dir, iname, lookup, &name); 2689 if (err) 2690 return err; 2691 2692 ext4_fname_from_fscrypt_name(fname, &name); 2693 2694 #ifdef CONFIG_UNICODE 2695 err = ext4_fname_setup_ci_filename(dir, iname, fname); 2696 #endif 2697 return err; 2698 } 2699 2700 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2701 struct dentry *dentry, 2702 struct ext4_filename *fname) 2703 { 2704 struct fscrypt_name name; 2705 int err; 2706 2707 err = fscrypt_prepare_lookup(dir, dentry, &name); 2708 if (err) 2709 return err; 2710 2711 ext4_fname_from_fscrypt_name(fname, &name); 2712 2713 #ifdef CONFIG_UNICODE 2714 err = ext4_fname_setup_ci_filename(dir, &dentry->d_name, fname); 2715 #endif 2716 return err; 2717 } 2718 2719 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2720 { 2721 struct fscrypt_name name; 2722 2723 name.crypto_buf = fname->crypto_buf; 2724 fscrypt_free_filename(&name); 2725 2726 fname->crypto_buf.name = NULL; 2727 fname->usr_fname = NULL; 2728 fname->disk_name.name = NULL; 2729 2730 #ifdef CONFIG_UNICODE 2731 kfree(fname->cf_name.name); 2732 fname->cf_name.name = NULL; 2733 #endif 2734 } 2735 #else /* !CONFIG_FS_ENCRYPTION */ 2736 static inline int ext4_fname_setup_filename(struct inode *dir, 2737 const struct qstr *iname, 2738 int lookup, 2739 struct ext4_filename *fname) 2740 { 2741 int err = 0; 2742 fname->usr_fname = iname; 2743 fname->disk_name.name = (unsigned char *) iname->name; 2744 fname->disk_name.len = iname->len; 2745 2746 #ifdef CONFIG_UNICODE 2747 err = ext4_fname_setup_ci_filename(dir, iname, fname); 2748 #endif 2749 2750 return err; 2751 } 2752 2753 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2754 struct dentry *dentry, 2755 struct ext4_filename *fname) 2756 { 2757 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname); 2758 } 2759 2760 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2761 { 2762 #ifdef CONFIG_UNICODE 2763 kfree(fname->cf_name.name); 2764 fname->cf_name.name = NULL; 2765 #endif 2766 } 2767 #endif /* !CONFIG_FS_ENCRYPTION */ 2768 2769 /* dir.c */ 2770 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2771 struct file *, 2772 struct ext4_dir_entry_2 *, 2773 struct buffer_head *, char *, int, 2774 unsigned int); 2775 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2776 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2777 (de), (bh), (buf), (size), (offset))) 2778 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2779 __u32 minor_hash, 2780 struct ext4_dir_entry_2 *dirent, 2781 struct fscrypt_str *ent_name); 2782 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2783 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2784 struct buffer_head *bh, 2785 void *buf, int buf_size, 2786 struct ext4_filename *fname, 2787 struct ext4_dir_entry_2 **dest_de); 2788 void ext4_insert_dentry(struct inode *dir, struct inode *inode, 2789 struct ext4_dir_entry_2 *de, 2790 int buf_size, 2791 struct ext4_filename *fname); 2792 static inline void ext4_update_dx_flag(struct inode *inode) 2793 { 2794 if (!ext4_has_feature_dir_index(inode->i_sb) && 2795 ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) { 2796 /* ext4_iget() should have caught this... */ 2797 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb)); 2798 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2799 } 2800 } 2801 static const unsigned char ext4_filetype_table[] = { 2802 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2803 }; 2804 2805 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2806 { 2807 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2808 return DT_UNKNOWN; 2809 2810 return ext4_filetype_table[filetype]; 2811 } 2812 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2813 void *buf, int buf_size); 2814 2815 /* fsync.c */ 2816 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2817 2818 /* hash.c */ 2819 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len, 2820 struct dx_hash_info *hinfo); 2821 2822 /* ialloc.c */ 2823 extern int ext4_mark_inode_used(struct super_block *sb, int ino); 2824 extern struct inode *__ext4_new_inode(struct user_namespace *, handle_t *, 2825 struct inode *, umode_t, 2826 const struct qstr *qstr, __u32 goal, 2827 uid_t *owner, __u32 i_flags, 2828 int handle_type, unsigned int line_no, 2829 int nblocks); 2830 2831 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \ 2832 __ext4_new_inode(&init_user_ns, (handle), (dir), (mode), (qstr), \ 2833 (goal), (owner), i_flags, 0, 0, 0) 2834 #define ext4_new_inode_start_handle(mnt_userns, dir, mode, qstr, goal, owner, \ 2835 type, nblocks) \ 2836 __ext4_new_inode((mnt_userns), NULL, (dir), (mode), (qstr), (goal), (owner), \ 2837 0, (type), __LINE__, (nblocks)) 2838 2839 2840 extern void ext4_free_inode(handle_t *, struct inode *); 2841 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2842 extern unsigned long ext4_count_free_inodes(struct super_block *); 2843 extern unsigned long ext4_count_dirs(struct super_block *); 2844 extern void ext4_check_inodes_bitmap(struct super_block *); 2845 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2846 extern int ext4_init_inode_table(struct super_block *sb, 2847 ext4_group_t group, int barrier); 2848 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2849 2850 /* fast_commit.c */ 2851 int ext4_fc_info_show(struct seq_file *seq, void *v); 2852 void ext4_fc_init(struct super_block *sb, journal_t *journal); 2853 void ext4_fc_init_inode(struct inode *inode); 2854 void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start, 2855 ext4_lblk_t end); 2856 void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode, 2857 struct dentry *dentry); 2858 void __ext4_fc_track_link(handle_t *handle, struct inode *inode, 2859 struct dentry *dentry); 2860 void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry); 2861 void ext4_fc_track_link(handle_t *handle, struct dentry *dentry); 2862 void __ext4_fc_track_create(handle_t *handle, struct inode *inode, 2863 struct dentry *dentry); 2864 void ext4_fc_track_create(handle_t *handle, struct dentry *dentry); 2865 void ext4_fc_track_inode(handle_t *handle, struct inode *inode); 2866 void ext4_fc_mark_ineligible(struct super_block *sb, int reason); 2867 void ext4_fc_start_ineligible(struct super_block *sb, int reason); 2868 void ext4_fc_stop_ineligible(struct super_block *sb); 2869 void ext4_fc_start_update(struct inode *inode); 2870 void ext4_fc_stop_update(struct inode *inode); 2871 void ext4_fc_del(struct inode *inode); 2872 bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block); 2873 void ext4_fc_replay_cleanup(struct super_block *sb); 2874 int ext4_fc_commit(journal_t *journal, tid_t commit_tid); 2875 int __init ext4_fc_init_dentry_cache(void); 2876 2877 /* mballoc.c */ 2878 extern const struct seq_operations ext4_mb_seq_groups_ops; 2879 extern const struct seq_operations ext4_mb_seq_structs_summary_ops; 2880 extern long ext4_mb_stats; 2881 extern long ext4_mb_max_to_scan; 2882 extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset); 2883 extern int ext4_mb_init(struct super_block *); 2884 extern int ext4_mb_release(struct super_block *); 2885 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2886 struct ext4_allocation_request *, int *); 2887 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2888 extern void ext4_discard_preallocations(struct inode *, unsigned int); 2889 extern int __init ext4_init_mballoc(void); 2890 extern void ext4_exit_mballoc(void); 2891 extern ext4_group_t ext4_mb_prefetch(struct super_block *sb, 2892 ext4_group_t group, 2893 unsigned int nr, int *cnt); 2894 extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group, 2895 unsigned int nr); 2896 2897 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2898 struct buffer_head *bh, ext4_fsblk_t block, 2899 unsigned long count, int flags); 2900 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2901 ext4_group_t ngroups); 2902 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2903 ext4_group_t i, struct ext4_group_desc *desc); 2904 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2905 ext4_fsblk_t block, unsigned long count); 2906 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2907 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid); 2908 extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block, 2909 int len, int state); 2910 2911 /* inode.c */ 2912 void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw, 2913 struct ext4_inode_info *ei); 2914 int ext4_inode_is_fast_symlink(struct inode *inode); 2915 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2916 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2917 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count, 2918 bool wait, struct buffer_head **bhs); 2919 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2920 struct buffer_head *bh_result, int create); 2921 int ext4_get_block(struct inode *inode, sector_t iblock, 2922 struct buffer_head *bh_result, int create); 2923 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2924 struct buffer_head *bh, int create); 2925 int ext4_walk_page_buffers(handle_t *handle, 2926 struct buffer_head *head, 2927 unsigned from, 2928 unsigned to, 2929 int *partial, 2930 int (*fn)(handle_t *handle, 2931 struct buffer_head *bh)); 2932 int do_journal_get_write_access(handle_t *handle, 2933 struct buffer_head *bh); 2934 #define FALL_BACK_TO_NONDELALLOC 1 2935 #define CONVERT_INLINE_DATA 2 2936 2937 typedef enum { 2938 EXT4_IGET_NORMAL = 0, 2939 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */ 2940 EXT4_IGET_HANDLE = 0x0002 /* Inode # is from a handle */ 2941 } ext4_iget_flags; 2942 2943 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, 2944 ext4_iget_flags flags, const char *function, 2945 unsigned int line); 2946 2947 #define ext4_iget(sb, ino, flags) \ 2948 __ext4_iget((sb), (ino), (flags), __func__, __LINE__) 2949 2950 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2951 extern int ext4_setattr(struct user_namespace *, struct dentry *, 2952 struct iattr *); 2953 extern int ext4_getattr(struct user_namespace *, const struct path *, 2954 struct kstat *, u32, unsigned int); 2955 extern void ext4_evict_inode(struct inode *); 2956 extern void ext4_clear_inode(struct inode *); 2957 extern int ext4_file_getattr(struct user_namespace *, const struct path *, 2958 struct kstat *, u32, unsigned int); 2959 extern int ext4_sync_inode(handle_t *, struct inode *); 2960 extern void ext4_dirty_inode(struct inode *, int); 2961 extern int ext4_change_inode_journal_flag(struct inode *, int); 2962 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2963 extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino, 2964 struct ext4_iloc *iloc); 2965 extern int ext4_inode_attach_jinode(struct inode *inode); 2966 extern int ext4_can_truncate(struct inode *inode); 2967 extern int ext4_truncate(struct inode *); 2968 extern int ext4_break_layouts(struct inode *); 2969 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2970 extern void ext4_set_inode_flags(struct inode *, bool init); 2971 extern int ext4_alloc_da_blocks(struct inode *inode); 2972 extern void ext4_set_aops(struct inode *inode); 2973 extern int ext4_writepage_trans_blocks(struct inode *); 2974 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2975 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2976 loff_t lstart, loff_t lend); 2977 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf); 2978 extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf); 2979 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2980 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 2981 extern void ext4_da_release_space(struct inode *inode, int to_free); 2982 extern void ext4_da_update_reserve_space(struct inode *inode, 2983 int used, int quota_claim); 2984 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 2985 ext4_fsblk_t pblk, ext4_lblk_t len); 2986 2987 /* indirect.c */ 2988 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2989 struct ext4_map_blocks *map, int flags); 2990 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2991 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2992 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2993 ext4_lblk_t start, ext4_lblk_t end); 2994 2995 /* ioctl.c */ 2996 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2997 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2998 int ext4_fileattr_set(struct user_namespace *mnt_userns, 2999 struct dentry *dentry, struct fileattr *fa); 3000 int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa); 3001 extern void ext4_reset_inode_seed(struct inode *inode); 3002 3003 /* migrate.c */ 3004 extern int ext4_ext_migrate(struct inode *); 3005 extern int ext4_ind_migrate(struct inode *inode); 3006 3007 /* namei.c */ 3008 extern int ext4_init_new_dir(handle_t *handle, struct inode *dir, 3009 struct inode *inode); 3010 extern int ext4_dirblock_csum_verify(struct inode *inode, 3011 struct buffer_head *bh); 3012 extern int ext4_orphan_add(handle_t *, struct inode *); 3013 extern int ext4_orphan_del(handle_t *, struct inode *); 3014 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 3015 __u32 start_minor_hash, __u32 *next_hash); 3016 extern int ext4_search_dir(struct buffer_head *bh, 3017 char *search_buf, 3018 int buf_size, 3019 struct inode *dir, 3020 struct ext4_filename *fname, 3021 unsigned int offset, 3022 struct ext4_dir_entry_2 **res_dir); 3023 extern int ext4_generic_delete_entry(struct inode *dir, 3024 struct ext4_dir_entry_2 *de_del, 3025 struct buffer_head *bh, 3026 void *entry_buf, 3027 int buf_size, 3028 int csum_size); 3029 extern bool ext4_empty_dir(struct inode *inode); 3030 3031 /* resize.c */ 3032 extern void ext4_kvfree_array_rcu(void *to_free); 3033 extern int ext4_group_add(struct super_block *sb, 3034 struct ext4_new_group_data *input); 3035 extern int ext4_group_extend(struct super_block *sb, 3036 struct ext4_super_block *es, 3037 ext4_fsblk_t n_blocks_count); 3038 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 3039 3040 /* super.c */ 3041 extern struct buffer_head *ext4_sb_bread(struct super_block *sb, 3042 sector_t block, int op_flags); 3043 extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb, 3044 sector_t block); 3045 extern void ext4_read_bh_nowait(struct buffer_head *bh, int op_flags, 3046 bh_end_io_t *end_io); 3047 extern int ext4_read_bh(struct buffer_head *bh, int op_flags, 3048 bh_end_io_t *end_io); 3049 extern int ext4_read_bh_lock(struct buffer_head *bh, int op_flags, bool wait); 3050 extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block); 3051 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 3052 extern int ext4_calculate_overhead(struct super_block *sb); 3053 extern void ext4_superblock_csum_set(struct super_block *sb); 3054 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 3055 ext4_group_t ngroup); 3056 extern const char *ext4_decode_error(struct super_block *sb, int errno, 3057 char nbuf[16]); 3058 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb, 3059 ext4_group_t block_group, 3060 unsigned int flags); 3061 3062 extern __printf(7, 8) 3063 void __ext4_error(struct super_block *, const char *, unsigned int, bool, 3064 int, __u64, const char *, ...); 3065 extern __printf(6, 7) 3066 void __ext4_error_inode(struct inode *, const char *, unsigned int, 3067 ext4_fsblk_t, int, const char *, ...); 3068 extern __printf(5, 6) 3069 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 3070 const char *, ...); 3071 extern void __ext4_std_error(struct super_block *, const char *, 3072 unsigned int, int); 3073 extern __printf(4, 5) 3074 void __ext4_warning(struct super_block *, const char *, unsigned int, 3075 const char *, ...); 3076 extern __printf(4, 5) 3077 void __ext4_warning_inode(const struct inode *inode, const char *function, 3078 unsigned int line, const char *fmt, ...); 3079 extern __printf(3, 4) 3080 void __ext4_msg(struct super_block *, const char *, const char *, ...); 3081 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 3082 const char *, unsigned int, const char *); 3083 extern __printf(7, 8) 3084 void __ext4_grp_locked_error(const char *, unsigned int, 3085 struct super_block *, ext4_group_t, 3086 unsigned long, ext4_fsblk_t, 3087 const char *, ...); 3088 3089 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 3090 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 3091 3092 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \ 3093 __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a) 3094 3095 #define ext4_error_inode_block(inode, block, err, fmt, a...) \ 3096 __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \ 3097 (fmt), ## a) 3098 3099 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 3100 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 3101 3102 #define ext4_abort(sb, err, fmt, a...) \ 3103 __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a) 3104 3105 #ifdef CONFIG_PRINTK 3106 3107 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 3108 __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__) 3109 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 3110 __ext4_error_inode((inode), (func), (line), (block), \ 3111 (err), (fmt), ##__VA_ARGS__) 3112 #define ext4_error_file(file, func, line, block, fmt, ...) \ 3113 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 3114 #define ext4_error(sb, fmt, ...) \ 3115 __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt), \ 3116 ##__VA_ARGS__) 3117 #define ext4_error_err(sb, err, fmt, ...) \ 3118 __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt), \ 3119 ##__VA_ARGS__) 3120 #define ext4_warning(sb, fmt, ...) \ 3121 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 3122 #define ext4_warning_inode(inode, fmt, ...) \ 3123 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 3124 #define ext4_msg(sb, level, fmt, ...) \ 3125 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 3126 #define dump_mmp_msg(sb, mmp, msg) \ 3127 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 3128 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 3129 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 3130 fmt, ##__VA_ARGS__) 3131 3132 #else 3133 3134 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 3135 do { \ 3136 no_printk(fmt, ##__VA_ARGS__); \ 3137 __ext4_error_inode(inode, "", 0, block, 0, " "); \ 3138 } while (0) 3139 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 3140 do { \ 3141 no_printk(fmt, ##__VA_ARGS__); \ 3142 __ext4_error_inode(inode, "", 0, block, err, " "); \ 3143 } while (0) 3144 #define ext4_error_file(file, func, line, block, fmt, ...) \ 3145 do { \ 3146 no_printk(fmt, ##__VA_ARGS__); \ 3147 __ext4_error_file(file, "", 0, block, " "); \ 3148 } while (0) 3149 #define ext4_error(sb, fmt, ...) \ 3150 do { \ 3151 no_printk(fmt, ##__VA_ARGS__); \ 3152 __ext4_error(sb, "", 0, false, 0, 0, " "); \ 3153 } while (0) 3154 #define ext4_error_err(sb, err, fmt, ...) \ 3155 do { \ 3156 no_printk(fmt, ##__VA_ARGS__); \ 3157 __ext4_error(sb, "", 0, false, err, 0, " "); \ 3158 } while (0) 3159 #define ext4_warning(sb, fmt, ...) \ 3160 do { \ 3161 no_printk(fmt, ##__VA_ARGS__); \ 3162 __ext4_warning(sb, "", 0, " "); \ 3163 } while (0) 3164 #define ext4_warning_inode(inode, fmt, ...) \ 3165 do { \ 3166 no_printk(fmt, ##__VA_ARGS__); \ 3167 __ext4_warning_inode(inode, "", 0, " "); \ 3168 } while (0) 3169 #define ext4_msg(sb, level, fmt, ...) \ 3170 do { \ 3171 no_printk(fmt, ##__VA_ARGS__); \ 3172 __ext4_msg(sb, "", " "); \ 3173 } while (0) 3174 #define dump_mmp_msg(sb, mmp, msg) \ 3175 __dump_mmp_msg(sb, mmp, "", 0, "") 3176 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 3177 do { \ 3178 no_printk(fmt, ##__VA_ARGS__); \ 3179 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 3180 } while (0) 3181 3182 #endif 3183 3184 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 3185 struct ext4_group_desc *bg); 3186 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 3187 struct ext4_group_desc *bg); 3188 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 3189 struct ext4_group_desc *bg); 3190 extern __u32 ext4_free_group_clusters(struct super_block *sb, 3191 struct ext4_group_desc *bg); 3192 extern __u32 ext4_free_inodes_count(struct super_block *sb, 3193 struct ext4_group_desc *bg); 3194 extern __u32 ext4_used_dirs_count(struct super_block *sb, 3195 struct ext4_group_desc *bg); 3196 extern __u32 ext4_itable_unused_count(struct super_block *sb, 3197 struct ext4_group_desc *bg); 3198 extern void ext4_block_bitmap_set(struct super_block *sb, 3199 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3200 extern void ext4_inode_bitmap_set(struct super_block *sb, 3201 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3202 extern void ext4_inode_table_set(struct super_block *sb, 3203 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3204 extern void ext4_free_group_clusters_set(struct super_block *sb, 3205 struct ext4_group_desc *bg, 3206 __u32 count); 3207 extern void ext4_free_inodes_set(struct super_block *sb, 3208 struct ext4_group_desc *bg, __u32 count); 3209 extern void ext4_used_dirs_set(struct super_block *sb, 3210 struct ext4_group_desc *bg, __u32 count); 3211 extern void ext4_itable_unused_set(struct super_block *sb, 3212 struct ext4_group_desc *bg, __u32 count); 3213 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 3214 struct ext4_group_desc *gdp); 3215 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 3216 struct ext4_group_desc *gdp); 3217 extern int ext4_register_li_request(struct super_block *sb, 3218 ext4_group_t first_not_zeroed); 3219 3220 static inline int ext4_has_metadata_csum(struct super_block *sb) 3221 { 3222 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 3223 !EXT4_SB(sb)->s_chksum_driver); 3224 3225 return ext4_has_feature_metadata_csum(sb) && 3226 (EXT4_SB(sb)->s_chksum_driver != NULL); 3227 } 3228 3229 static inline int ext4_has_group_desc_csum(struct super_block *sb) 3230 { 3231 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb); 3232 } 3233 3234 #define ext4_read_incompat_64bit_val(es, name) \ 3235 (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \ 3236 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \ 3237 le32_to_cpu(es->name##_lo)) 3238 3239 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 3240 { 3241 return ext4_read_incompat_64bit_val(es, s_blocks_count); 3242 } 3243 3244 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 3245 { 3246 return ext4_read_incompat_64bit_val(es, s_r_blocks_count); 3247 } 3248 3249 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 3250 { 3251 return ext4_read_incompat_64bit_val(es, s_free_blocks_count); 3252 } 3253 3254 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 3255 ext4_fsblk_t blk) 3256 { 3257 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 3258 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 3259 } 3260 3261 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 3262 ext4_fsblk_t blk) 3263 { 3264 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 3265 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 3266 } 3267 3268 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 3269 ext4_fsblk_t blk) 3270 { 3271 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 3272 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 3273 } 3274 3275 static inline loff_t ext4_isize(struct super_block *sb, 3276 struct ext4_inode *raw_inode) 3277 { 3278 if (ext4_has_feature_largedir(sb) || 3279 S_ISREG(le16_to_cpu(raw_inode->i_mode))) 3280 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 3281 le32_to_cpu(raw_inode->i_size_lo); 3282 3283 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 3284 } 3285 3286 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 3287 { 3288 raw_inode->i_size_lo = cpu_to_le32(i_size); 3289 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 3290 } 3291 3292 static inline 3293 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 3294 ext4_group_t group) 3295 { 3296 struct ext4_group_info **grp_info; 3297 long indexv, indexh; 3298 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 3299 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 3300 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 3301 grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv); 3302 return grp_info[indexh]; 3303 } 3304 3305 /* 3306 * Reading s_groups_count requires using smp_rmb() afterwards. See 3307 * the locking protocol documented in the comments of ext4_group_add() 3308 * in resize.c 3309 */ 3310 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 3311 { 3312 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 3313 3314 smp_rmb(); 3315 return ngroups; 3316 } 3317 3318 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 3319 ext4_group_t block_group) 3320 { 3321 return block_group >> sbi->s_log_groups_per_flex; 3322 } 3323 3324 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 3325 { 3326 return 1 << sbi->s_log_groups_per_flex; 3327 } 3328 3329 #define ext4_std_error(sb, errno) \ 3330 do { \ 3331 if ((errno)) \ 3332 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 3333 } while (0) 3334 3335 #ifdef CONFIG_SMP 3336 /* Each CPU can accumulate percpu_counter_batch clusters in their local 3337 * counters. So we need to make sure we have free clusters more 3338 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 3339 */ 3340 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 3341 #else 3342 #define EXT4_FREECLUSTERS_WATERMARK 0 3343 #endif 3344 3345 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 3346 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 3347 { 3348 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 3349 !inode_is_locked(inode)); 3350 down_write(&EXT4_I(inode)->i_data_sem); 3351 if (newsize > EXT4_I(inode)->i_disksize) 3352 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize); 3353 up_write(&EXT4_I(inode)->i_data_sem); 3354 } 3355 3356 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 3357 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 3358 { 3359 int changed = 0; 3360 3361 if (newsize > inode->i_size) { 3362 i_size_write(inode, newsize); 3363 changed = 1; 3364 } 3365 if (newsize > EXT4_I(inode)->i_disksize) { 3366 ext4_update_i_disksize(inode, newsize); 3367 changed |= 2; 3368 } 3369 return changed; 3370 } 3371 3372 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 3373 loff_t len); 3374 3375 struct ext4_group_info { 3376 unsigned long bb_state; 3377 #ifdef AGGRESSIVE_CHECK 3378 unsigned long bb_check_counter; 3379 #endif 3380 struct rb_root bb_free_root; 3381 ext4_grpblk_t bb_first_free; /* first free block */ 3382 ext4_grpblk_t bb_free; /* total free blocks */ 3383 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 3384 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 3385 ext4_group_t bb_group; /* Group number */ 3386 struct list_head bb_prealloc_list; 3387 #ifdef DOUBLE_CHECK 3388 void *bb_bitmap; 3389 #endif 3390 struct rw_semaphore alloc_sem; 3391 struct rb_node bb_avg_fragment_size_rb; 3392 struct list_head bb_largest_free_order_node; 3393 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 3394 * regions, index is order. 3395 * bb_counters[3] = 5 means 3396 * 5 free 8-block regions. */ 3397 }; 3398 3399 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 3400 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 3401 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 3402 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 3403 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \ 3404 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT) 3405 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \ 3406 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT) 3407 #define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4 3408 3409 #define EXT4_MB_GRP_NEED_INIT(grp) \ 3410 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 3411 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 3412 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3413 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 3414 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3415 3416 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 3417 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3418 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 3419 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3420 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 3421 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3422 #define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \ 3423 (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state))) 3424 3425 #define EXT4_MAX_CONTENTION 8 3426 #define EXT4_CONTENTION_THRESHOLD 2 3427 3428 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 3429 ext4_group_t group) 3430 { 3431 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 3432 } 3433 3434 /* 3435 * Returns true if the filesystem is busy enough that attempts to 3436 * access the block group locks has run into contention. 3437 */ 3438 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 3439 { 3440 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 3441 } 3442 3443 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 3444 { 3445 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 3446 if (spin_trylock(lock)) 3447 /* 3448 * We're able to grab the lock right away, so drop the 3449 * lock contention counter. 3450 */ 3451 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 3452 else { 3453 /* 3454 * The lock is busy, so bump the contention counter, 3455 * and then wait on the spin lock. 3456 */ 3457 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 3458 EXT4_MAX_CONTENTION); 3459 spin_lock(lock); 3460 } 3461 } 3462 3463 static inline void ext4_unlock_group(struct super_block *sb, 3464 ext4_group_t group) 3465 { 3466 spin_unlock(ext4_group_lock_ptr(sb, group)); 3467 } 3468 3469 #ifdef CONFIG_QUOTA 3470 static inline bool ext4_quota_capable(struct super_block *sb) 3471 { 3472 return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb)); 3473 } 3474 3475 static inline bool ext4_is_quota_journalled(struct super_block *sb) 3476 { 3477 struct ext4_sb_info *sbi = EXT4_SB(sb); 3478 3479 return (ext4_has_feature_quota(sb) || 3480 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]); 3481 } 3482 #endif 3483 3484 /* 3485 * Block validity checking 3486 */ 3487 #define ext4_check_indirect_blockref(inode, bh) \ 3488 ext4_check_blockref(__func__, __LINE__, inode, \ 3489 (__le32 *)(bh)->b_data, \ 3490 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 3491 3492 #define ext4_ind_check_inode(inode) \ 3493 ext4_check_blockref(__func__, __LINE__, inode, \ 3494 EXT4_I(inode)->i_data, \ 3495 EXT4_NDIR_BLOCKS) 3496 3497 /* 3498 * Inodes and files operations 3499 */ 3500 3501 /* dir.c */ 3502 extern const struct file_operations ext4_dir_operations; 3503 3504 /* file.c */ 3505 extern const struct inode_operations ext4_file_inode_operations; 3506 extern const struct file_operations ext4_file_operations; 3507 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 3508 3509 /* inline.c */ 3510 extern int ext4_get_max_inline_size(struct inode *inode); 3511 extern int ext4_find_inline_data_nolock(struct inode *inode); 3512 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 3513 unsigned int len); 3514 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 3515 3516 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 3517 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 3518 struct inode *inode, 3519 loff_t pos, unsigned len, 3520 unsigned flags, 3521 struct page **pagep); 3522 extern int ext4_write_inline_data_end(struct inode *inode, 3523 loff_t pos, unsigned len, 3524 unsigned copied, 3525 struct page *page); 3526 extern struct buffer_head * 3527 ext4_journalled_write_inline_data(struct inode *inode, 3528 unsigned len, 3529 struct page *page); 3530 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 3531 struct inode *inode, 3532 loff_t pos, unsigned len, 3533 unsigned flags, 3534 struct page **pagep, 3535 void **fsdata); 3536 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 3537 unsigned len, unsigned copied, 3538 struct page *page); 3539 extern int ext4_try_add_inline_entry(handle_t *handle, 3540 struct ext4_filename *fname, 3541 struct inode *dir, struct inode *inode); 3542 extern int ext4_try_create_inline_dir(handle_t *handle, 3543 struct inode *parent, 3544 struct inode *inode); 3545 extern int ext4_read_inline_dir(struct file *filp, 3546 struct dir_context *ctx, 3547 int *has_inline_data); 3548 extern int ext4_inlinedir_to_tree(struct file *dir_file, 3549 struct inode *dir, ext4_lblk_t block, 3550 struct dx_hash_info *hinfo, 3551 __u32 start_hash, __u32 start_minor_hash, 3552 int *has_inline_data); 3553 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3554 struct ext4_filename *fname, 3555 struct ext4_dir_entry_2 **res_dir, 3556 int *has_inline_data); 3557 extern int ext4_delete_inline_entry(handle_t *handle, 3558 struct inode *dir, 3559 struct ext4_dir_entry_2 *de_del, 3560 struct buffer_head *bh, 3561 int *has_inline_data); 3562 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); 3563 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3564 struct ext4_dir_entry_2 **parent_de, 3565 int *retval); 3566 extern int ext4_inline_data_fiemap(struct inode *inode, 3567 struct fiemap_extent_info *fieinfo, 3568 int *has_inline, __u64 start, __u64 len); 3569 3570 struct iomap; 3571 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap); 3572 3573 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3574 3575 extern int ext4_convert_inline_data(struct inode *inode); 3576 3577 static inline int ext4_has_inline_data(struct inode *inode) 3578 { 3579 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3580 EXT4_I(inode)->i_inline_off; 3581 } 3582 3583 /* namei.c */ 3584 extern const struct inode_operations ext4_dir_inode_operations; 3585 extern const struct inode_operations ext4_special_inode_operations; 3586 extern struct dentry *ext4_get_parent(struct dentry *child); 3587 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3588 struct ext4_dir_entry_2 *de, 3589 int blocksize, int csum_size, 3590 unsigned int parent_ino, int dotdot_real_len); 3591 extern void ext4_initialize_dirent_tail(struct buffer_head *bh, 3592 unsigned int blocksize); 3593 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode, 3594 struct buffer_head *bh); 3595 extern int __ext4_unlink(handle_t *handle, struct inode *dir, const struct qstr *d_name, 3596 struct inode *inode); 3597 extern int __ext4_link(struct inode *dir, struct inode *inode, 3598 struct dentry *dentry); 3599 3600 #define S_SHIFT 12 3601 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = { 3602 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3603 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3604 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3605 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3606 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3607 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3608 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3609 }; 3610 3611 static inline void ext4_set_de_type(struct super_block *sb, 3612 struct ext4_dir_entry_2 *de, 3613 umode_t mode) { 3614 if (ext4_has_feature_filetype(sb)) 3615 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3616 } 3617 3618 /* readpages.c */ 3619 extern int ext4_mpage_readpages(struct inode *inode, 3620 struct readahead_control *rac, struct page *page); 3621 extern int __init ext4_init_post_read_processing(void); 3622 extern void ext4_exit_post_read_processing(void); 3623 3624 /* symlink.c */ 3625 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3626 extern const struct inode_operations ext4_symlink_inode_operations; 3627 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3628 3629 /* sysfs.c */ 3630 extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi); 3631 extern int ext4_register_sysfs(struct super_block *sb); 3632 extern void ext4_unregister_sysfs(struct super_block *sb); 3633 extern int __init ext4_init_sysfs(void); 3634 extern void ext4_exit_sysfs(void); 3635 3636 /* block_validity */ 3637 extern void ext4_release_system_zone(struct super_block *sb); 3638 extern int ext4_setup_system_zone(struct super_block *sb); 3639 extern int __init ext4_init_system_zone(void); 3640 extern void ext4_exit_system_zone(void); 3641 extern int ext4_inode_block_valid(struct inode *inode, 3642 ext4_fsblk_t start_blk, 3643 unsigned int count); 3644 extern int ext4_check_blockref(const char *, unsigned int, 3645 struct inode *, __le32 *, unsigned int); 3646 3647 /* extents.c */ 3648 struct ext4_ext_path; 3649 struct ext4_extent; 3650 3651 /* 3652 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3653 * __le32. 3654 */ 3655 #define EXT_MAX_BLOCKS 0xffffffff 3656 3657 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode); 3658 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3659 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3660 struct ext4_map_blocks *map, int flags); 3661 extern int ext4_ext_truncate(handle_t *, struct inode *); 3662 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3663 ext4_lblk_t end); 3664 extern void ext4_ext_init(struct super_block *); 3665 extern void ext4_ext_release(struct super_block *); 3666 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3667 loff_t len); 3668 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3669 loff_t offset, ssize_t len); 3670 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle, 3671 ext4_io_end_t *io_end); 3672 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3673 struct ext4_map_blocks *map, int flags); 3674 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3675 int num, 3676 struct ext4_ext_path *path); 3677 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3678 struct ext4_ext_path **, 3679 struct ext4_extent *, int); 3680 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3681 struct ext4_ext_path **, 3682 int flags); 3683 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 3684 extern int ext4_ext_check_inode(struct inode *inode); 3685 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3686 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3687 __u64 start, __u64 len); 3688 extern int ext4_get_es_cache(struct inode *inode, 3689 struct fiemap_extent_info *fieinfo, 3690 __u64 start, __u64 len); 3691 extern int ext4_ext_precache(struct inode *inode); 3692 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3693 struct inode *inode2, ext4_lblk_t lblk1, 3694 ext4_lblk_t lblk2, ext4_lblk_t count, 3695 int mark_unwritten,int *err); 3696 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu); 3697 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode, 3698 int check_cred, int restart_cred, 3699 int revoke_cred); 3700 extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end); 3701 extern int ext4_ext_replay_set_iblocks(struct inode *inode); 3702 extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start, 3703 int len, int unwritten, ext4_fsblk_t pblk); 3704 extern int ext4_ext_clear_bb(struct inode *inode); 3705 3706 3707 /* move_extent.c */ 3708 extern void ext4_double_down_write_data_sem(struct inode *first, 3709 struct inode *second); 3710 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3711 struct inode *donor_inode); 3712 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3713 __u64 start_orig, __u64 start_donor, 3714 __u64 len, __u64 *moved_len); 3715 3716 /* page-io.c */ 3717 extern int __init ext4_init_pageio(void); 3718 extern void ext4_exit_pageio(void); 3719 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3720 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3721 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3722 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3723 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3724 struct writeback_control *wbc); 3725 extern void ext4_end_io_rsv_work(struct work_struct *work); 3726 extern void ext4_io_submit(struct ext4_io_submit *io); 3727 extern int ext4_bio_write_page(struct ext4_io_submit *io, 3728 struct page *page, 3729 int len, 3730 bool keep_towrite); 3731 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end); 3732 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end); 3733 3734 /* mmp.c */ 3735 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3736 3737 /* mmp.c */ 3738 extern void ext4_stop_mmpd(struct ext4_sb_info *sbi); 3739 3740 /* verity.c */ 3741 extern const struct fsverity_operations ext4_verityops; 3742 3743 /* 3744 * Add new method to test whether block and inode bitmaps are properly 3745 * initialized. With uninit_bg reading the block from disk is not enough 3746 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3747 */ 3748 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3749 3750 static inline int bitmap_uptodate(struct buffer_head *bh) 3751 { 3752 return (buffer_uptodate(bh) && 3753 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3754 } 3755 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3756 { 3757 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3758 } 3759 3760 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3761 3762 /* For ioend & aio unwritten conversion wait queues */ 3763 #define EXT4_WQ_HASH_SZ 37 3764 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3765 EXT4_WQ_HASH_SZ]) 3766 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3767 3768 extern int ext4_resize_begin(struct super_block *sb); 3769 extern void ext4_resize_end(struct super_block *sb); 3770 3771 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 3772 struct ext4_io_end *io_end) 3773 { 3774 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 3775 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3776 atomic_inc(&EXT4_I(inode)->i_unwritten); 3777 } 3778 } 3779 3780 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3781 { 3782 struct inode *inode = io_end->inode; 3783 3784 if (io_end->flag & EXT4_IO_END_UNWRITTEN) { 3785 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3786 /* Wake up anyone waiting on unwritten extent conversion */ 3787 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) 3788 wake_up_all(ext4_ioend_wq(inode)); 3789 } 3790 } 3791 3792 extern const struct iomap_ops ext4_iomap_ops; 3793 extern const struct iomap_ops ext4_iomap_overwrite_ops; 3794 extern const struct iomap_ops ext4_iomap_report_ops; 3795 3796 static inline int ext4_buffer_uptodate(struct buffer_head *bh) 3797 { 3798 /* 3799 * If the buffer has the write error flag, we have failed 3800 * to write out data in the block. In this case, we don't 3801 * have to read the block because we may read the old data 3802 * successfully. 3803 */ 3804 if (buffer_write_io_error(bh)) 3805 set_buffer_uptodate(bh); 3806 return buffer_uptodate(bh); 3807 } 3808 3809 #endif /* __KERNEL__ */ 3810 3811 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3812 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3813 3814 #endif /* _EXT4_H */ 3815