1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * ext4.h 4 * 5 * Copyright (C) 1992, 1993, 1994, 1995 6 * Remy Card (card@masi.ibp.fr) 7 * Laboratoire MASI - Institut Blaise Pascal 8 * Universite Pierre et Marie Curie (Paris VI) 9 * 10 * from 11 * 12 * linux/include/linux/minix_fs.h 13 * 14 * Copyright (C) 1991, 1992 Linus Torvalds 15 */ 16 17 #ifndef _EXT4_H 18 #define _EXT4_H 19 20 #include <linux/refcount.h> 21 #include <linux/types.h> 22 #include <linux/blkdev.h> 23 #include <linux/magic.h> 24 #include <linux/jbd2.h> 25 #include <linux/quota.h> 26 #include <linux/rwsem.h> 27 #include <linux/rbtree.h> 28 #include <linux/seqlock.h> 29 #include <linux/mutex.h> 30 #include <linux/timer.h> 31 #include <linux/wait.h> 32 #include <linux/sched/signal.h> 33 #include <linux/blockgroup_lock.h> 34 #include <linux/percpu_counter.h> 35 #include <linux/ratelimit.h> 36 #include <linux/crc32c.h> 37 #include <linux/falloc.h> 38 #include <linux/percpu-rwsem.h> 39 #include <linux/fiemap.h> 40 #ifdef __KERNEL__ 41 #include <linux/compat.h> 42 #endif 43 #include <uapi/linux/ext4.h> 44 45 #include <linux/fscrypt.h> 46 #include <linux/fsverity.h> 47 48 #include <linux/compiler.h> 49 50 /* 51 * The fourth extended filesystem constants/structures 52 */ 53 54 /* 55 * with AGGRESSIVE_CHECK allocator runs consistency checks over 56 * structures. these checks slow things down a lot 57 */ 58 #define AGGRESSIVE_CHECK__ 59 60 /* 61 * with DOUBLE_CHECK defined mballoc creates persistent in-core 62 * bitmaps, maintains and uses them to check for double allocations 63 */ 64 #define DOUBLE_CHECK__ 65 66 /* 67 * Define EXT4FS_DEBUG to produce debug messages 68 */ 69 #undef EXT4FS_DEBUG 70 71 /* 72 * Debug code 73 */ 74 #ifdef EXT4FS_DEBUG 75 #define ext4_debug(f, a...) \ 76 do { \ 77 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 78 __FILE__, __LINE__, __func__); \ 79 printk(KERN_DEBUG f, ## a); \ 80 } while (0) 81 #else 82 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 83 #endif 84 85 /* 86 * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c 87 */ 88 #define EXT_DEBUG__ 89 90 /* 91 * Dynamic printk for controlled extents debugging. 92 */ 93 #ifdef CONFIG_EXT4_DEBUG 94 #define ext_debug(ino, fmt, ...) \ 95 pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt, \ 96 current->comm, task_pid_nr(current), \ 97 ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__, \ 98 __func__, ##__VA_ARGS__) 99 #else 100 #define ext_debug(ino, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 101 #endif 102 103 #define ASSERT(assert) \ 104 do { \ 105 if (unlikely(!(assert))) { \ 106 printk(KERN_EMERG \ 107 "Assertion failure in %s() at %s:%d: '%s'\n", \ 108 __func__, __FILE__, __LINE__, #assert); \ 109 BUG(); \ 110 } \ 111 } while (0) 112 113 /* data type for block offset of block group */ 114 typedef int ext4_grpblk_t; 115 116 /* data type for filesystem-wide blocks number */ 117 typedef unsigned long long ext4_fsblk_t; 118 119 /* data type for file logical block number */ 120 typedef __u32 ext4_lblk_t; 121 122 /* data type for block group number */ 123 typedef unsigned int ext4_group_t; 124 125 enum SHIFT_DIRECTION { 126 SHIFT_LEFT = 0, 127 SHIFT_RIGHT, 128 }; 129 130 /* 131 * For each criteria, mballoc has slightly different way of finding 132 * the required blocks nad usually, higher the criteria the slower the 133 * allocation. We start at lower criterias and keep falling back to 134 * higher ones if we are not able to find any blocks. Lower (earlier) 135 * criteria are faster. 136 */ 137 enum criteria { 138 /* 139 * Used when number of blocks needed is a power of 2. This 140 * doesn't trigger any disk IO except prefetch and is the 141 * fastest criteria. 142 */ 143 CR_POWER2_ALIGNED, 144 145 /* 146 * Tries to lookup in-memory data structures to find the most 147 * suitable group that satisfies goal request. No disk IO 148 * except block prefetch. 149 */ 150 CR_GOAL_LEN_FAST, 151 152 /* 153 * Same as CR_GOAL_LEN_FAST but is allowed to reduce the goal 154 * length to the best available length for faster allocation. 155 */ 156 CR_BEST_AVAIL_LEN, 157 158 /* 159 * Reads each block group sequentially, performing disk IO if 160 * necessary, to find suitable block group. Tries to 161 * allocate goal length but might trim the request if nothing 162 * is found after enough tries. 163 */ 164 CR_GOAL_LEN_SLOW, 165 166 /* 167 * Finds the first free set of blocks and allocates 168 * those. This is only used in rare cases when 169 * CR_GOAL_LEN_SLOW also fails to allocate anything. 170 */ 171 CR_ANY_FREE, 172 173 /* 174 * Number of criterias defined. 175 */ 176 EXT4_MB_NUM_CRS 177 }; 178 179 /* 180 * Flags used in mballoc's allocation_context flags field. 181 * 182 * Also used to show what's going on for debugging purposes when the 183 * flag field is exported via the traceport interface 184 */ 185 186 /* prefer goal again. length */ 187 #define EXT4_MB_HINT_MERGE 0x0001 188 /* first blocks in the file */ 189 #define EXT4_MB_HINT_FIRST 0x0008 190 /* data is being allocated */ 191 #define EXT4_MB_HINT_DATA 0x0020 192 /* don't preallocate (for tails) */ 193 #define EXT4_MB_HINT_NOPREALLOC 0x0040 194 /* allocate for locality group */ 195 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 196 /* allocate goal blocks or none */ 197 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 198 /* goal is meaningful */ 199 #define EXT4_MB_HINT_TRY_GOAL 0x0200 200 /* blocks already pre-reserved by delayed allocation */ 201 #define EXT4_MB_DELALLOC_RESERVED 0x0400 202 /* We are doing stream allocation */ 203 #define EXT4_MB_STREAM_ALLOC 0x0800 204 /* Use reserved root blocks if needed */ 205 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 206 /* Use blocks from reserved pool */ 207 #define EXT4_MB_USE_RESERVED 0x2000 208 /* Do strict check for free blocks while retrying block allocation */ 209 #define EXT4_MB_STRICT_CHECK 0x4000 210 211 struct ext4_allocation_request { 212 /* target inode for block we're allocating */ 213 struct inode *inode; 214 /* how many blocks we want to allocate */ 215 unsigned int len; 216 /* logical block in target inode */ 217 ext4_lblk_t logical; 218 /* the closest logical allocated block to the left */ 219 ext4_lblk_t lleft; 220 /* the closest logical allocated block to the right */ 221 ext4_lblk_t lright; 222 /* phys. target (a hint) */ 223 ext4_fsblk_t goal; 224 /* phys. block for the closest logical allocated block to the left */ 225 ext4_fsblk_t pleft; 226 /* phys. block for the closest logical allocated block to the right */ 227 ext4_fsblk_t pright; 228 /* flags. see above EXT4_MB_HINT_* */ 229 unsigned int flags; 230 }; 231 232 /* 233 * Logical to physical block mapping, used by ext4_map_blocks() 234 * 235 * This structure is used to pass requests into ext4_map_blocks() as 236 * well as to store the information returned by ext4_map_blocks(). It 237 * takes less room on the stack than a struct buffer_head. 238 */ 239 #define EXT4_MAP_NEW BIT(BH_New) 240 #define EXT4_MAP_MAPPED BIT(BH_Mapped) 241 #define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten) 242 #define EXT4_MAP_BOUNDARY BIT(BH_Boundary) 243 #define EXT4_MAP_DELAYED BIT(BH_Delay) 244 /* 245 * This is for use in ext4_map_query_blocks() for a special case where we can 246 * have a physically and logically contiguous blocks split across two leaf 247 * nodes instead of a single extent. This is required in case of atomic writes 248 * to know whether the returned extent is last in leaf. If yes, then lookup for 249 * next in leaf block in ext4_map_query_blocks_next_in_leaf(). 250 * - This is never going to be added to any buffer head state. 251 * - We use the next available bit after BH_BITMAP_UPTODATE. 252 */ 253 #define EXT4_MAP_QUERY_LAST_IN_LEAF BIT(BH_BITMAP_UPTODATE + 1) 254 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 255 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\ 256 EXT4_MAP_DELAYED | EXT4_MAP_QUERY_LAST_IN_LEAF) 257 258 struct ext4_map_blocks { 259 ext4_fsblk_t m_pblk; 260 ext4_lblk_t m_lblk; 261 unsigned int m_len; 262 unsigned int m_flags; 263 }; 264 265 /* 266 * Block validity checking, system zone rbtree. 267 */ 268 struct ext4_system_blocks { 269 struct rb_root root; 270 struct rcu_head rcu; 271 }; 272 273 /* 274 * Flags for ext4_io_end->flags 275 */ 276 #define EXT4_IO_END_UNWRITTEN 0x0001 277 #define EXT4_IO_END_FAILED 0x0002 278 279 #define EXT4_IO_END_DEFER_COMPLETION (EXT4_IO_END_UNWRITTEN | EXT4_IO_END_FAILED) 280 281 struct ext4_io_end_vec { 282 struct list_head list; /* list of io_end_vec */ 283 loff_t offset; /* offset in the file */ 284 ssize_t size; /* size of the extent */ 285 }; 286 287 /* 288 * For converting unwritten extents on a work queue. 'handle' is used for 289 * buffered writeback. 290 */ 291 typedef struct ext4_io_end { 292 struct list_head list; /* per-file finished IO list */ 293 handle_t *handle; /* handle reserved for extent 294 * conversion */ 295 struct inode *inode; /* file being written to */ 296 struct bio *bio; /* Linked list of completed 297 * bios covering the extent */ 298 unsigned int flag; /* unwritten or not */ 299 refcount_t count; /* reference counter */ 300 struct list_head list_vec; /* list of ext4_io_end_vec */ 301 } ext4_io_end_t; 302 303 struct ext4_io_submit { 304 struct writeback_control *io_wbc; 305 struct bio *io_bio; 306 ext4_io_end_t *io_end; 307 sector_t io_next_block; 308 }; 309 310 /* 311 * Special inodes numbers 312 */ 313 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 314 #define EXT4_ROOT_INO 2 /* Root inode */ 315 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 316 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 317 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 318 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 319 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 320 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 321 322 /* First non-reserved inode for old ext4 filesystems */ 323 #define EXT4_GOOD_OLD_FIRST_INO 11 324 325 /* 326 * Maximal count of links to a file 327 */ 328 #define EXT4_LINK_MAX 65000 329 330 /* 331 * Macro-instructions used to manage several block sizes 332 */ 333 #define EXT4_MIN_BLOCK_SIZE 1024 334 #define EXT4_MAX_BLOCK_SIZE 65536 335 #define EXT4_MIN_BLOCK_LOG_SIZE 10 336 #define EXT4_MAX_BLOCK_LOG_SIZE 16 337 #define EXT4_MAX_CLUSTER_LOG_SIZE 30 338 #ifdef __KERNEL__ 339 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 340 #else 341 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 342 #endif 343 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 344 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 345 EXT4_SB(s)->s_cluster_bits) 346 #ifdef __KERNEL__ 347 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 348 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 349 #else 350 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 351 #endif 352 #ifdef __KERNEL__ 353 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 354 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 355 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 356 #else 357 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 358 EXT4_GOOD_OLD_INODE_SIZE : \ 359 (s)->s_inode_size) 360 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 361 EXT4_GOOD_OLD_FIRST_INO : \ 362 (s)->s_first_ino) 363 #endif 364 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 365 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \ 366 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \ 367 blkbits)) 368 #define EXT4_B_TO_LBLK(inode, offset) \ 369 (round_up((offset), i_blocksize(inode)) >> (inode)->i_blkbits) 370 371 /* Translate a block number to a cluster number */ 372 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 373 /* Translate a cluster number to a block number */ 374 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 375 /* Translate # of blks to # of clusters */ 376 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 377 (sbi)->s_cluster_bits) 378 /* Mask out the low bits to get the starting block of the cluster */ 379 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 380 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 381 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 382 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 383 /* Fill in the low bits to get the last block of the cluster */ 384 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \ 385 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1)) 386 /* Get the cluster offset */ 387 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 388 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 389 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 390 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 391 392 /* 393 * Structure of a blocks group descriptor 394 */ 395 struct ext4_group_desc 396 { 397 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 398 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 399 __le32 bg_inode_table_lo; /* Inodes table block */ 400 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 401 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 402 __le16 bg_used_dirs_count_lo; /* Directories count */ 403 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 404 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 405 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 406 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 407 __le16 bg_itable_unused_lo; /* Unused inodes count */ 408 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 409 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 410 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 411 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 412 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 413 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 414 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 415 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 416 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 417 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 418 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 419 __u32 bg_reserved; 420 }; 421 422 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 423 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 424 sizeof(__le16)) 425 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 426 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 427 sizeof(__le16)) 428 429 /* 430 * Structure of a flex block group info 431 */ 432 433 struct flex_groups { 434 atomic64_t free_clusters; 435 atomic_t free_inodes; 436 atomic_t used_dirs; 437 }; 438 439 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 440 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 441 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 442 443 /* 444 * Macro-instructions used to manage group descriptors 445 */ 446 #define EXT4_MIN_DESC_SIZE 32 447 #define EXT4_MIN_DESC_SIZE_64BIT 64 448 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 449 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 450 #ifdef __KERNEL__ 451 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 452 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 453 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 454 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 455 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 456 #else 457 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 458 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 459 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 460 #endif 461 462 /* 463 * Constants relative to the data blocks 464 */ 465 #define EXT4_NDIR_BLOCKS 12 466 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 467 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 468 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 469 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 470 471 /* 472 * Inode flags 473 */ 474 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 475 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 476 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 477 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 478 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 479 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 480 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 481 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 482 /* Reserved for compression usage... */ 483 #define EXT4_DIRTY_FL 0x00000100 484 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 485 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 486 /* nb: was previously EXT2_ECOMPR_FL */ 487 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 488 /* End compression flags --- maybe not all used */ 489 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 490 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 491 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 492 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 493 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 494 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 495 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 496 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 497 #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */ 498 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 499 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */ 500 501 #define EXT4_DAX_FL 0x02000000 /* Inode is DAX */ 502 503 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 504 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 505 #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */ 506 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 507 508 /* User modifiable flags */ 509 #define EXT4_FL_USER_MODIFIABLE (EXT4_SECRM_FL | \ 510 EXT4_UNRM_FL | \ 511 EXT4_COMPR_FL | \ 512 EXT4_SYNC_FL | \ 513 EXT4_IMMUTABLE_FL | \ 514 EXT4_APPEND_FL | \ 515 EXT4_NODUMP_FL | \ 516 EXT4_NOATIME_FL | \ 517 EXT4_JOURNAL_DATA_FL | \ 518 EXT4_NOTAIL_FL | \ 519 EXT4_DIRSYNC_FL | \ 520 EXT4_TOPDIR_FL | \ 521 EXT4_EXTENTS_FL | \ 522 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \ 523 EXT4_DAX_FL | \ 524 EXT4_PROJINHERIT_FL | \ 525 EXT4_CASEFOLD_FL) 526 527 /* User visible flags */ 528 #define EXT4_FL_USER_VISIBLE (EXT4_FL_USER_MODIFIABLE | \ 529 EXT4_DIRTY_FL | \ 530 EXT4_COMPRBLK_FL | \ 531 EXT4_NOCOMPR_FL | \ 532 EXT4_ENCRYPT_FL | \ 533 EXT4_INDEX_FL | \ 534 EXT4_VERITY_FL | \ 535 EXT4_INLINE_DATA_FL) 536 537 /* Flags that should be inherited by new inodes from their parent. */ 538 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 539 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 540 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 541 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 542 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\ 543 EXT4_DAX_FL) 544 545 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 546 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\ 547 EXT4_PROJINHERIT_FL)) 548 549 /* Flags that are appropriate for non-directories/regular files. */ 550 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 551 552 /* The only flags that should be swapped */ 553 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL) 554 555 /* Flags which are mutually exclusive to DAX */ 556 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\ 557 EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL) 558 559 /* Mask out flags that are inappropriate for the given type of inode. */ 560 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 561 { 562 if (S_ISDIR(mode)) 563 return flags; 564 else if (S_ISREG(mode)) 565 return flags & EXT4_REG_FLMASK; 566 else 567 return flags & EXT4_OTHER_FLMASK; 568 } 569 570 /* 571 * Inode flags used for atomic set/get 572 */ 573 enum { 574 EXT4_INODE_SECRM = 0, /* Secure deletion */ 575 EXT4_INODE_UNRM = 1, /* Undelete */ 576 EXT4_INODE_COMPR = 2, /* Compress file */ 577 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 578 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 579 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 580 EXT4_INODE_NODUMP = 6, /* do not dump file */ 581 EXT4_INODE_NOATIME = 7, /* do not update atime */ 582 /* Reserved for compression usage... */ 583 EXT4_INODE_DIRTY = 8, 584 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 585 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 586 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 587 /* End compression flags --- maybe not all used */ 588 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 589 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 590 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 591 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 592 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 593 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 594 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 595 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 596 EXT4_INODE_VERITY = 20, /* Verity protected inode */ 597 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 598 /* 22 was formerly EXT4_INODE_EOFBLOCKS */ 599 EXT4_INODE_DAX = 25, /* Inode is DAX */ 600 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 601 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 602 EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */ 603 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 604 }; 605 606 /* 607 * Since it's pretty easy to mix up bit numbers and hex values, we use a 608 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 609 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 610 * any extra space in the compiled kernel image, otherwise, the build will fail. 611 * It's important that these values are the same, since we are using 612 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 613 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 614 * values found in ext2, ext3 and ext4 filesystems, and of course the values 615 * defined in e2fsprogs. 616 * 617 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 618 */ 619 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1U << EXT4_INODE_##FLAG)) 620 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 621 622 static inline void ext4_check_flag_values(void) 623 { 624 CHECK_FLAG_VALUE(SECRM); 625 CHECK_FLAG_VALUE(UNRM); 626 CHECK_FLAG_VALUE(COMPR); 627 CHECK_FLAG_VALUE(SYNC); 628 CHECK_FLAG_VALUE(IMMUTABLE); 629 CHECK_FLAG_VALUE(APPEND); 630 CHECK_FLAG_VALUE(NODUMP); 631 CHECK_FLAG_VALUE(NOATIME); 632 CHECK_FLAG_VALUE(DIRTY); 633 CHECK_FLAG_VALUE(COMPRBLK); 634 CHECK_FLAG_VALUE(NOCOMPR); 635 CHECK_FLAG_VALUE(ENCRYPT); 636 CHECK_FLAG_VALUE(INDEX); 637 CHECK_FLAG_VALUE(IMAGIC); 638 CHECK_FLAG_VALUE(JOURNAL_DATA); 639 CHECK_FLAG_VALUE(NOTAIL); 640 CHECK_FLAG_VALUE(DIRSYNC); 641 CHECK_FLAG_VALUE(TOPDIR); 642 CHECK_FLAG_VALUE(HUGE_FILE); 643 CHECK_FLAG_VALUE(EXTENTS); 644 CHECK_FLAG_VALUE(VERITY); 645 CHECK_FLAG_VALUE(EA_INODE); 646 CHECK_FLAG_VALUE(INLINE_DATA); 647 CHECK_FLAG_VALUE(PROJINHERIT); 648 CHECK_FLAG_VALUE(CASEFOLD); 649 CHECK_FLAG_VALUE(RESERVED); 650 } 651 652 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 653 struct compat_ext4_new_group_input { 654 u32 group; 655 compat_u64 block_bitmap; 656 compat_u64 inode_bitmap; 657 compat_u64 inode_table; 658 u32 blocks_count; 659 u16 reserved_blocks; 660 u16 unused; 661 }; 662 #endif 663 664 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 665 struct ext4_new_group_data { 666 __u32 group; 667 __u64 block_bitmap; 668 __u64 inode_bitmap; 669 __u64 inode_table; 670 __u32 blocks_count; 671 __u16 reserved_blocks; 672 __u16 mdata_blocks; 673 __u32 free_clusters_count; 674 }; 675 676 /* Indexes used to index group tables in ext4_new_group_data */ 677 enum { 678 BLOCK_BITMAP = 0, /* block bitmap */ 679 INODE_BITMAP, /* inode bitmap */ 680 INODE_TABLE, /* inode tables */ 681 GROUP_TABLE_COUNT, 682 }; 683 684 /* 685 * Flags used by ext4_map_blocks() 686 */ 687 /* Allocate any needed blocks and/or convert an unwritten 688 extent to be an initialized ext4 */ 689 #define EXT4_GET_BLOCKS_CREATE 0x0001 690 /* Request the creation of an unwritten extent */ 691 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 692 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 693 EXT4_GET_BLOCKS_CREATE) 694 /* Caller is from the delayed allocation writeout path 695 * finally doing the actual allocation of delayed blocks */ 696 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 697 /* caller is from the direct IO path, request to creation of an 698 unwritten extents if not allocated, split the unwritten 699 extent if blocks has been preallocated already*/ 700 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 701 #define EXT4_GET_BLOCKS_CONVERT 0x0010 702 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 703 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 704 /* Eventual metadata allocation (due to growing extent tree) 705 * should not fail, so try to use reserved blocks for that.*/ 706 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 707 /* Don't normalize allocation size (used for fallocate) */ 708 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 709 /* Convert written extents to unwritten */ 710 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 711 /* Write zeros to newly created written extents */ 712 #define EXT4_GET_BLOCKS_ZERO 0x0200 713 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 714 EXT4_GET_BLOCKS_ZERO) 715 /* Caller is in the context of data submission, such as writeback, 716 * fsync, etc. Especially, in the generic writeback path, caller will 717 * submit data before dropping transaction handle. This allows jbd2 718 * to avoid submitting data before commit. */ 719 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 720 /* Convert extent to initialized after IO complete */ 721 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT |\ 722 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT |\ 723 EXT4_GET_BLOCKS_IO_SUBMIT) 724 /* Caller is in the atomic contex, find extent if it has been cached */ 725 #define EXT4_GET_BLOCKS_CACHED_NOWAIT 0x0800 726 /* 727 * Atomic write caller needs this to query in the slow path of mixed mapping 728 * case, when a contiguous extent can be split across two adjacent leaf nodes. 729 * Look EXT4_MAP_QUERY_LAST_IN_LEAF. 730 */ 731 #define EXT4_GET_BLOCKS_QUERY_LAST_IN_LEAF 0x1000 732 733 /* 734 * The bit position of these flags must not overlap with any of the 735 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 736 * read_extent_tree_block(), ext4_split_extent_at(), 737 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 738 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 739 * caching the extents when reading from the extent tree while a 740 * truncate or punch hole operation is in progress. 741 */ 742 #define EXT4_EX_NOCACHE 0x40000000 743 #define EXT4_EX_FORCE_CACHE 0x20000000 744 #define EXT4_EX_NOFAIL 0x10000000 745 /* 746 * ext4_map_query_blocks() uses this filter mask to filter the flags needed to 747 * pass while lookup/querying of on disk extent tree. 748 */ 749 #define EXT4_EX_QUERY_FILTER (EXT4_EX_NOCACHE | EXT4_EX_FORCE_CACHE |\ 750 EXT4_EX_NOFAIL |\ 751 EXT4_GET_BLOCKS_QUERY_LAST_IN_LEAF) 752 753 /* 754 * Flags used by ext4_free_blocks 755 */ 756 #define EXT4_FREE_BLOCKS_METADATA 0x0001 757 #define EXT4_FREE_BLOCKS_FORGET 0x0002 758 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 759 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 760 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 761 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 762 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040 763 764 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 765 /* 766 * ioctl commands in 32 bit emulation 767 */ 768 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 769 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 770 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 771 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 772 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 773 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 774 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 775 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 776 #endif 777 778 /* Max physical block we can address w/o extents */ 779 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 780 781 /* Max logical block we can support */ 782 #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE 783 784 /* 785 * Structure of an inode on the disk 786 */ 787 struct ext4_inode { 788 __le16 i_mode; /* File mode */ 789 __le16 i_uid; /* Low 16 bits of Owner Uid */ 790 __le32 i_size_lo; /* Size in bytes */ 791 __le32 i_atime; /* Access time */ 792 __le32 i_ctime; /* Inode Change time */ 793 __le32 i_mtime; /* Modification time */ 794 __le32 i_dtime; /* Deletion Time */ 795 __le16 i_gid; /* Low 16 bits of Group Id */ 796 __le16 i_links_count; /* Links count */ 797 __le32 i_blocks_lo; /* Blocks count */ 798 __le32 i_flags; /* File flags */ 799 union { 800 struct { 801 __le32 l_i_version; 802 } linux1; 803 struct { 804 __u32 h_i_translator; 805 } hurd1; 806 struct { 807 __u32 m_i_reserved1; 808 } masix1; 809 } osd1; /* OS dependent 1 */ 810 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 811 __le32 i_generation; /* File version (for NFS) */ 812 __le32 i_file_acl_lo; /* File ACL */ 813 __le32 i_size_high; 814 __le32 i_obso_faddr; /* Obsoleted fragment address */ 815 union { 816 struct { 817 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 818 __le16 l_i_file_acl_high; 819 __le16 l_i_uid_high; /* these 2 fields */ 820 __le16 l_i_gid_high; /* were reserved2[0] */ 821 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 822 __le16 l_i_reserved; 823 } linux2; 824 struct { 825 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 826 __u16 h_i_mode_high; 827 __u16 h_i_uid_high; 828 __u16 h_i_gid_high; 829 __u32 h_i_author; 830 } hurd2; 831 struct { 832 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 833 __le16 m_i_file_acl_high; 834 __u32 m_i_reserved2[2]; 835 } masix2; 836 } osd2; /* OS dependent 2 */ 837 __le16 i_extra_isize; 838 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 839 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 840 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 841 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 842 __le32 i_crtime; /* File Creation time */ 843 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 844 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 845 __le32 i_projid; /* Project ID */ 846 }; 847 848 #define EXT4_EPOCH_BITS 2 849 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 850 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 851 852 /* 853 * Extended fields will fit into an inode if the filesystem was formatted 854 * with large inodes (-I 256 or larger) and there are not currently any EAs 855 * consuming all of the available space. For new inodes we always reserve 856 * enough space for the kernel's known extended fields, but for inodes 857 * created with an old kernel this might not have been the case. None of 858 * the extended inode fields is critical for correct filesystem operation. 859 * This macro checks if a certain field fits in the inode. Note that 860 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 861 */ 862 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 863 ((offsetof(typeof(*ext4_inode), field) + \ 864 sizeof((ext4_inode)->field)) \ 865 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 866 (einode)->i_extra_isize)) \ 867 868 /* 869 * We use an encoding that preserves the times for extra epoch "00": 870 * 871 * extra msb of adjust for signed 872 * epoch 32-bit 32-bit tv_sec to 873 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 874 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 875 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 876 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 877 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 878 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 879 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 880 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 881 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 882 * 883 * Note that previous versions of the kernel on 64-bit systems would 884 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 885 * 1970. e2fsck will correct this, assuming that it is run on the 886 * affected filesystem before 2242. 887 */ 888 889 static inline __le32 ext4_encode_extra_time(struct timespec64 ts) 890 { 891 u32 extra = ((ts.tv_sec - (s32)ts.tv_sec) >> 32) & EXT4_EPOCH_MASK; 892 return cpu_to_le32(extra | (ts.tv_nsec << EXT4_EPOCH_BITS)); 893 } 894 895 static inline struct timespec64 ext4_decode_extra_time(__le32 base, 896 __le32 extra) 897 { 898 struct timespec64 ts = { .tv_sec = (signed)le32_to_cpu(base) }; 899 900 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) 901 ts.tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 902 ts.tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 903 return ts; 904 } 905 906 #define EXT4_INODE_SET_XTIME_VAL(xtime, inode, raw_inode, ts) \ 907 do { \ 908 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \ 909 (raw_inode)->xtime = cpu_to_le32((ts).tv_sec); \ 910 (raw_inode)->xtime ## _extra = ext4_encode_extra_time(ts); \ 911 } else \ 912 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (ts).tv_sec, S32_MIN, S32_MAX)); \ 913 } while (0) 914 915 #define EXT4_INODE_SET_ATIME(inode, raw_inode) \ 916 EXT4_INODE_SET_XTIME_VAL(i_atime, inode, raw_inode, inode_get_atime(inode)) 917 918 #define EXT4_INODE_SET_MTIME(inode, raw_inode) \ 919 EXT4_INODE_SET_XTIME_VAL(i_mtime, inode, raw_inode, inode_get_mtime(inode)) 920 921 #define EXT4_INODE_SET_CTIME(inode, raw_inode) \ 922 EXT4_INODE_SET_XTIME_VAL(i_ctime, inode, raw_inode, inode_get_ctime(inode)) 923 924 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 925 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 926 EXT4_INODE_SET_XTIME_VAL(xtime, &((einode)->vfs_inode), \ 927 raw_inode, (einode)->xtime) 928 929 #define EXT4_INODE_GET_XTIME_VAL(xtime, inode, raw_inode) \ 930 (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra) ? \ 931 ext4_decode_extra_time((raw_inode)->xtime, \ 932 (raw_inode)->xtime ## _extra) : \ 933 (struct timespec64) { \ 934 .tv_sec = (signed)le32_to_cpu((raw_inode)->xtime) \ 935 }) 936 937 #define EXT4_INODE_GET_ATIME(inode, raw_inode) \ 938 do { \ 939 inode_set_atime_to_ts(inode, \ 940 EXT4_INODE_GET_XTIME_VAL(i_atime, inode, raw_inode)); \ 941 } while (0) 942 943 #define EXT4_INODE_GET_MTIME(inode, raw_inode) \ 944 do { \ 945 inode_set_mtime_to_ts(inode, \ 946 EXT4_INODE_GET_XTIME_VAL(i_mtime, inode, raw_inode)); \ 947 } while (0) 948 949 #define EXT4_INODE_GET_CTIME(inode, raw_inode) \ 950 do { \ 951 inode_set_ctime_to_ts(inode, \ 952 EXT4_INODE_GET_XTIME_VAL(i_ctime, inode, raw_inode)); \ 953 } while (0) 954 955 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 956 do { \ 957 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 958 (einode)->xtime = \ 959 EXT4_INODE_GET_XTIME_VAL(xtime, &(einode->vfs_inode), \ 960 raw_inode); \ 961 else \ 962 (einode)->xtime = (struct timespec64){0, 0}; \ 963 } while (0) 964 965 #define i_disk_version osd1.linux1.l_i_version 966 967 #if defined(__KERNEL__) || defined(__linux__) 968 #define i_reserved1 osd1.linux1.l_i_reserved1 969 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 970 #define i_blocks_high osd2.linux2.l_i_blocks_high 971 #define i_uid_low i_uid 972 #define i_gid_low i_gid 973 #define i_uid_high osd2.linux2.l_i_uid_high 974 #define i_gid_high osd2.linux2.l_i_gid_high 975 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 976 977 #elif defined(__GNU__) 978 979 #define i_translator osd1.hurd1.h_i_translator 980 #define i_uid_high osd2.hurd2.h_i_uid_high 981 #define i_gid_high osd2.hurd2.h_i_gid_high 982 #define i_author osd2.hurd2.h_i_author 983 984 #elif defined(__masix__) 985 986 #define i_reserved1 osd1.masix1.m_i_reserved1 987 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 988 #define i_reserved2 osd2.masix2.m_i_reserved2 989 990 #endif /* defined(__KERNEL__) || defined(__linux__) */ 991 992 #include "extents_status.h" 993 #include "fast_commit.h" 994 995 /* 996 * Lock subclasses for i_data_sem in the ext4_inode_info structure. 997 * 998 * These are needed to avoid lockdep false positives when we need to 999 * allocate blocks to the quota inode during ext4_map_blocks(), while 1000 * holding i_data_sem for a normal (non-quota) inode. Since we don't 1001 * do quota tracking for the quota inode, this avoids deadlock (as 1002 * well as infinite recursion, since it isn't turtles all the way 1003 * down...) 1004 * 1005 * I_DATA_SEM_NORMAL - Used for most inodes 1006 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode 1007 * where the second inode has larger inode number 1008 * than the first 1009 * I_DATA_SEM_QUOTA - Used for quota inodes only 1010 * I_DATA_SEM_EA - Used for ea_inodes only 1011 */ 1012 enum { 1013 I_DATA_SEM_NORMAL = 0, 1014 I_DATA_SEM_OTHER, 1015 I_DATA_SEM_QUOTA, 1016 I_DATA_SEM_EA 1017 }; 1018 1019 1020 /* 1021 * fourth extended file system inode data in memory 1022 */ 1023 struct ext4_inode_info { 1024 __le32 i_data[15]; /* unconverted */ 1025 __u32 i_dtime; 1026 ext4_fsblk_t i_file_acl; 1027 1028 /* 1029 * i_block_group is the number of the block group which contains 1030 * this file's inode. Constant across the lifetime of the inode, 1031 * it is used for making block allocation decisions - we try to 1032 * place a file's data blocks near its inode block, and new inodes 1033 * near to their parent directory's inode. 1034 */ 1035 ext4_group_t i_block_group; 1036 ext4_lblk_t i_dir_start_lookup; 1037 #if (BITS_PER_LONG < 64) 1038 unsigned long i_state_flags; /* Dynamic state flags */ 1039 #endif 1040 unsigned long i_flags; 1041 1042 /* 1043 * Extended attributes can be read independently of the main file 1044 * data. Taking i_rwsem even when reading would cause contention 1045 * between readers of EAs and writers of regular file data, so 1046 * instead we synchronize on xattr_sem when reading or changing 1047 * EAs. 1048 */ 1049 struct rw_semaphore xattr_sem; 1050 1051 /* 1052 * Inodes with EXT4_STATE_ORPHAN_FILE use i_orphan_idx. Otherwise 1053 * i_orphan is used. 1054 */ 1055 union { 1056 struct list_head i_orphan; /* unlinked but open inodes */ 1057 unsigned int i_orphan_idx; /* Index in orphan file */ 1058 }; 1059 1060 /* Fast commit related info */ 1061 1062 /* For tracking dentry create updates */ 1063 struct list_head i_fc_dilist; 1064 struct list_head i_fc_list; /* 1065 * inodes that need fast commit 1066 * protected by sbi->s_fc_lock. 1067 */ 1068 1069 /* Start of lblk range that needs to be committed in this fast commit */ 1070 ext4_lblk_t i_fc_lblk_start; 1071 1072 /* End of lblk range that needs to be committed in this fast commit */ 1073 ext4_lblk_t i_fc_lblk_len; 1074 1075 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 1076 1077 /* Fast commit wait queue for this inode */ 1078 wait_queue_head_t i_fc_wait; 1079 1080 /* 1081 * Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len 1082 * and inode's EXT4_FC_STATE_COMMITTING state bit. 1083 */ 1084 spinlock_t i_fc_lock; 1085 1086 /* 1087 * i_disksize keeps track of what the inode size is ON DISK, not 1088 * in memory. During truncate, i_size is set to the new size by 1089 * the VFS prior to calling ext4_truncate(), but the filesystem won't 1090 * set i_disksize to 0 until the truncate is actually under way. 1091 * 1092 * The intent is that i_disksize always represents the blocks which 1093 * are used by this file. This allows recovery to restart truncate 1094 * on orphans if we crash during truncate. We actually write i_disksize 1095 * into the on-disk inode when writing inodes out, instead of i_size. 1096 * 1097 * The only time when i_disksize and i_size may be different is when 1098 * a truncate is in progress. The only things which change i_disksize 1099 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 1100 */ 1101 loff_t i_disksize; 1102 1103 /* 1104 * i_data_sem is for serialising ext4_truncate() against 1105 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 1106 * data tree are chopped off during truncate. We can't do that in 1107 * ext4 because whenever we perform intermediate commits during 1108 * truncate, the inode and all the metadata blocks *must* be in a 1109 * consistent state which allows truncation of the orphans to restart 1110 * during recovery. Hence we must fix the get_block-vs-truncate race 1111 * by other means, so we have i_data_sem. 1112 */ 1113 struct rw_semaphore i_data_sem; 1114 struct inode vfs_inode; 1115 struct jbd2_inode *jinode; 1116 1117 /* 1118 * File creation time. Its function is same as that of 1119 * struct timespec64 i_{a,c,m}time in the generic inode. 1120 */ 1121 struct timespec64 i_crtime; 1122 1123 /* mballoc */ 1124 atomic_t i_prealloc_active; 1125 1126 /* allocation reservation info for delalloc */ 1127 /* In case of bigalloc, this refer to clusters rather than blocks */ 1128 unsigned int i_reserved_data_blocks; 1129 struct rb_root i_prealloc_node; 1130 rwlock_t i_prealloc_lock; 1131 1132 /* extents status tree */ 1133 struct ext4_es_tree i_es_tree; 1134 rwlock_t i_es_lock; 1135 struct list_head i_es_list; 1136 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1137 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1138 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1139 extents to shrink. Protected by 1140 i_es_lock */ 1141 1142 /* ialloc */ 1143 ext4_group_t i_last_alloc_group; 1144 1145 /* pending cluster reservations for bigalloc file systems */ 1146 struct ext4_pending_tree i_pending_tree; 1147 1148 /* on-disk additional length */ 1149 __u16 i_extra_isize; 1150 1151 /* Indicate the inline data space. */ 1152 u16 i_inline_off; 1153 u16 i_inline_size; 1154 1155 #ifdef CONFIG_QUOTA 1156 /* quota space reservation, managed internally by quota code */ 1157 qsize_t i_reserved_quota; 1158 #endif 1159 spinlock_t i_block_reservation_lock; 1160 1161 /* Lock protecting lists below */ 1162 spinlock_t i_completed_io_lock; 1163 /* 1164 * Completed IOs that need unwritten extents handling and have 1165 * transaction reserved 1166 */ 1167 struct list_head i_rsv_conversion_list; 1168 struct work_struct i_rsv_conversion_work; 1169 1170 /* 1171 * Transactions that contain inode's metadata needed to complete 1172 * fsync and fdatasync, respectively. 1173 */ 1174 tid_t i_sync_tid; 1175 tid_t i_datasync_tid; 1176 1177 #ifdef CONFIG_QUOTA 1178 struct dquot __rcu *i_dquot[MAXQUOTAS]; 1179 #endif 1180 1181 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1182 __u32 i_csum_seed; 1183 1184 kprojid_t i_projid; 1185 }; 1186 1187 /* 1188 * File system states 1189 */ 1190 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1191 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1192 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1193 #define EXT4_FC_REPLAY 0x0020 /* Fast commit replay ongoing */ 1194 1195 /* 1196 * Misc. filesystem flags 1197 */ 1198 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1199 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1200 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1201 1202 /* 1203 * Mount flags set via mount options or defaults 1204 */ 1205 #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */ 1206 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1207 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1208 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1209 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1210 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1211 #define EXT4_MOUNT_ERRORS_MASK 0x00070 1212 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1213 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1214 #ifdef CONFIG_FS_DAX 1215 #define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */ 1216 #else 1217 #define EXT4_MOUNT_DAX_ALWAYS 0 1218 #endif 1219 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1220 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1221 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1222 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1223 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1224 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1225 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1226 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1227 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1228 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1229 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */ 1230 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota, 1231 * enable enforcement for hidden 1232 * quota files */ 1233 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable 1234 * enforcement for hidden quota 1235 * files */ 1236 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota 1237 * enforcement */ 1238 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1239 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1240 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1241 #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */ 1242 #define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000 1243 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1244 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1245 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1246 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1247 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1248 1249 /* 1250 * Mount flags set either automatically (could not be set by mount option) 1251 * based on per file system feature or property or in special cases such as 1252 * distinguishing between explicit mount option definition and default. 1253 */ 1254 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1255 specified delalloc */ 1256 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1257 size of blocksize * 8 1258 blocks */ 1259 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1260 file systems */ 1261 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1262 specified journal checksum */ 1263 1264 #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */ 1265 #define EXT4_MOUNT2_DAX_NEVER 0x00000020 /* Do not allow Direct Access */ 1266 #define EXT4_MOUNT2_DAX_INODE 0x00000040 /* For printing options only */ 1267 #define EXT4_MOUNT2_MB_OPTIMIZE_SCAN 0x00000080 /* Optimize group 1268 * scanning in mballoc 1269 */ 1270 #define EXT4_MOUNT2_ABORT 0x00000100 /* Abort filesystem */ 1271 1272 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1273 ~EXT4_MOUNT_##opt 1274 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1275 EXT4_MOUNT_##opt 1276 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1277 EXT4_MOUNT_##opt) 1278 1279 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1280 ~EXT4_MOUNT2_##opt 1281 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1282 EXT4_MOUNT2_##opt 1283 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1284 EXT4_MOUNT2_##opt) 1285 1286 #define ext4_test_and_set_bit __test_and_set_bit_le 1287 #define ext4_set_bit __set_bit_le 1288 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1289 #define ext4_clear_bit __clear_bit_le 1290 #define ext4_test_bit test_bit_le 1291 #define ext4_find_next_zero_bit find_next_zero_bit_le 1292 #define ext4_find_next_bit find_next_bit_le 1293 1294 extern void mb_set_bits(void *bm, int cur, int len); 1295 1296 /* 1297 * Maximal mount counts between two filesystem checks 1298 */ 1299 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1300 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1301 1302 /* 1303 * Behaviour when detecting errors 1304 */ 1305 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1306 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1307 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1308 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1309 1310 /* Metadata checksum algorithm codes */ 1311 #define EXT4_CRC32C_CHKSUM 1 1312 1313 #define EXT4_LABEL_MAX 16 1314 1315 /* 1316 * Structure of the super block 1317 */ 1318 struct ext4_super_block { 1319 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1320 __le32 s_blocks_count_lo; /* Blocks count */ 1321 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1322 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1323 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1324 __le32 s_first_data_block; /* First Data Block */ 1325 __le32 s_log_block_size; /* Block size */ 1326 __le32 s_log_cluster_size; /* Allocation cluster size */ 1327 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1328 __le32 s_clusters_per_group; /* # Clusters per group */ 1329 __le32 s_inodes_per_group; /* # Inodes per group */ 1330 __le32 s_mtime; /* Mount time */ 1331 /*30*/ __le32 s_wtime; /* Write time */ 1332 __le16 s_mnt_count; /* Mount count */ 1333 __le16 s_max_mnt_count; /* Maximal mount count */ 1334 __le16 s_magic; /* Magic signature */ 1335 __le16 s_state; /* File system state */ 1336 __le16 s_errors; /* Behaviour when detecting errors */ 1337 __le16 s_minor_rev_level; /* minor revision level */ 1338 /*40*/ __le32 s_lastcheck; /* time of last check */ 1339 __le32 s_checkinterval; /* max. time between checks */ 1340 __le32 s_creator_os; /* OS */ 1341 __le32 s_rev_level; /* Revision level */ 1342 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1343 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1344 /* 1345 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1346 * 1347 * Note: the difference between the compatible feature set and 1348 * the incompatible feature set is that if there is a bit set 1349 * in the incompatible feature set that the kernel doesn't 1350 * know about, it should refuse to mount the filesystem. 1351 * 1352 * e2fsck's requirements are more strict; if it doesn't know 1353 * about a feature in either the compatible or incompatible 1354 * feature set, it must abort and not try to meddle with 1355 * things it doesn't understand... 1356 */ 1357 __le32 s_first_ino; /* First non-reserved inode */ 1358 __le16 s_inode_size; /* size of inode structure */ 1359 __le16 s_block_group_nr; /* block group # of this superblock */ 1360 __le32 s_feature_compat; /* compatible feature set */ 1361 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1362 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1363 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1364 /*78*/ char s_volume_name[EXT4_LABEL_MAX] __nonstring; /* volume name */ 1365 /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */ 1366 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1367 /* 1368 * Performance hints. Directory preallocation should only 1369 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1370 */ 1371 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1372 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1373 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1374 /* 1375 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1376 */ 1377 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1378 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1379 __le32 s_journal_dev; /* device number of journal file */ 1380 __le32 s_last_orphan; /* start of list of inodes to delete */ 1381 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1382 __u8 s_def_hash_version; /* Default hash version to use */ 1383 __u8 s_jnl_backup_type; 1384 __le16 s_desc_size; /* size of group descriptor */ 1385 /*100*/ __le32 s_default_mount_opts; 1386 __le32 s_first_meta_bg; /* First metablock block group */ 1387 __le32 s_mkfs_time; /* When the filesystem was created */ 1388 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1389 /* 64bit support valid if EXT4_FEATURE_INCOMPAT_64BIT */ 1390 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1391 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1392 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1393 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1394 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1395 __le32 s_flags; /* Miscellaneous flags */ 1396 __le16 s_raid_stride; /* RAID stride */ 1397 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1398 __le64 s_mmp_block; /* Block for multi-mount protection */ 1399 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1400 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1401 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1402 __u8 s_encryption_level; /* versioning level for encryption */ 1403 __u8 s_reserved_pad; /* Padding to next 32bits */ 1404 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1405 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1406 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1407 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1408 snapshot's future use */ 1409 __le32 s_snapshot_list; /* inode number of the head of the 1410 on-disk snapshot list */ 1411 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1412 __le32 s_error_count; /* number of fs errors */ 1413 __le32 s_first_error_time; /* first time an error happened */ 1414 __le32 s_first_error_ino; /* inode involved in first error */ 1415 __le64 s_first_error_block; /* block involved of first error */ 1416 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */ 1417 __le32 s_first_error_line; /* line number where error happened */ 1418 __le32 s_last_error_time; /* most recent time of an error */ 1419 __le32 s_last_error_ino; /* inode involved in last error */ 1420 __le32 s_last_error_line; /* line number where error happened */ 1421 __le64 s_last_error_block; /* block involved of last error */ 1422 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */ 1423 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1424 __u8 s_mount_opts[64]; 1425 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1426 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1427 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1428 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1429 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1430 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1431 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1432 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1433 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1434 __u8 s_wtime_hi; 1435 __u8 s_mtime_hi; 1436 __u8 s_mkfs_time_hi; 1437 __u8 s_lastcheck_hi; 1438 __u8 s_first_error_time_hi; 1439 __u8 s_last_error_time_hi; 1440 __u8 s_first_error_errcode; 1441 __u8 s_last_error_errcode; 1442 __le16 s_encoding; /* Filename charset encoding */ 1443 __le16 s_encoding_flags; /* Filename charset encoding flags */ 1444 __le32 s_orphan_file_inum; /* Inode for tracking orphan inodes */ 1445 __le32 s_reserved[94]; /* Padding to the end of the block */ 1446 __le32 s_checksum; /* crc32c(superblock) */ 1447 }; 1448 1449 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1450 1451 #ifdef __KERNEL__ 1452 1453 /* Number of quota types we support */ 1454 #define EXT4_MAXQUOTAS 3 1455 1456 #define EXT4_ENC_UTF8_12_1 1 1457 1458 /* Types of ext4 journal triggers */ 1459 enum ext4_journal_trigger_type { 1460 EXT4_JTR_ORPHAN_FILE, 1461 EXT4_JTR_NONE /* This must be the last entry for indexing to work! */ 1462 }; 1463 1464 #define EXT4_JOURNAL_TRIGGER_COUNT EXT4_JTR_NONE 1465 1466 struct ext4_journal_trigger { 1467 struct jbd2_buffer_trigger_type tr_triggers; 1468 struct super_block *sb; 1469 }; 1470 1471 static inline struct ext4_journal_trigger *EXT4_TRIGGER( 1472 struct jbd2_buffer_trigger_type *trigger) 1473 { 1474 return container_of(trigger, struct ext4_journal_trigger, tr_triggers); 1475 } 1476 1477 #define EXT4_ORPHAN_BLOCK_MAGIC 0x0b10ca04 1478 1479 /* Structure at the tail of orphan block */ 1480 struct ext4_orphan_block_tail { 1481 __le32 ob_magic; 1482 __le32 ob_checksum; 1483 }; 1484 1485 static inline int ext4_inodes_per_orphan_block(struct super_block *sb) 1486 { 1487 return (sb->s_blocksize - sizeof(struct ext4_orphan_block_tail)) / 1488 sizeof(u32); 1489 } 1490 1491 struct ext4_orphan_block { 1492 atomic_t ob_free_entries; /* Number of free orphan entries in block */ 1493 struct buffer_head *ob_bh; /* Buffer for orphan block */ 1494 }; 1495 1496 /* 1497 * Info about orphan file. 1498 */ 1499 struct ext4_orphan_info { 1500 int of_blocks; /* Number of orphan blocks in a file */ 1501 __u32 of_csum_seed; /* Checksum seed for orphan file */ 1502 struct ext4_orphan_block *of_binfo; /* Array with info about orphan 1503 * file blocks */ 1504 }; 1505 1506 /* 1507 * fourth extended-fs super-block data in memory 1508 */ 1509 struct ext4_sb_info { 1510 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1511 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1512 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1513 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1514 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1515 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1516 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1517 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1518 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1519 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1520 unsigned long s_overhead; /* # of fs overhead clusters */ 1521 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1522 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1523 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1524 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1525 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1526 /* Array of bh's for the block group descriptors */ 1527 struct buffer_head * __rcu *s_group_desc; 1528 unsigned int s_mount_opt; 1529 unsigned int s_mount_opt2; 1530 unsigned long s_mount_flags; 1531 unsigned int s_def_mount_opt; 1532 unsigned int s_def_mount_opt2; 1533 ext4_fsblk_t s_sb_block; 1534 atomic64_t s_resv_clusters; 1535 kuid_t s_resuid; 1536 kgid_t s_resgid; 1537 unsigned short s_mount_state; 1538 unsigned short s_pad; 1539 int s_addr_per_block_bits; 1540 int s_desc_per_block_bits; 1541 int s_inode_size; 1542 int s_first_ino; 1543 unsigned int s_inode_readahead_blks; 1544 unsigned int s_inode_goal; 1545 u32 s_hash_seed[4]; 1546 int s_def_hash_version; 1547 int s_hash_unsigned; /* 3 if hash should be unsigned, 0 if not */ 1548 struct percpu_counter s_freeclusters_counter; 1549 struct percpu_counter s_freeinodes_counter; 1550 struct percpu_counter s_dirs_counter; 1551 struct percpu_counter s_dirtyclusters_counter; 1552 struct percpu_counter s_sra_exceeded_retry_limit; 1553 struct blockgroup_lock *s_blockgroup_lock; 1554 struct proc_dir_entry *s_proc; 1555 struct kobject s_kobj; 1556 struct completion s_kobj_unregister; 1557 struct super_block *s_sb; 1558 struct buffer_head *s_mmp_bh; 1559 1560 /* Journaling */ 1561 struct journal_s *s_journal; 1562 unsigned long s_ext4_flags; /* Ext4 superblock flags */ 1563 struct mutex s_orphan_lock; /* Protects on disk list changes */ 1564 struct list_head s_orphan; /* List of orphaned inodes in on disk 1565 list */ 1566 struct ext4_orphan_info s_orphan_info; 1567 unsigned long s_commit_interval; 1568 u32 s_max_batch_time; 1569 u32 s_min_batch_time; 1570 struct file *s_journal_bdev_file; 1571 #ifdef CONFIG_QUOTA 1572 /* Names of quota files with journalled quota */ 1573 char __rcu *s_qf_names[EXT4_MAXQUOTAS]; 1574 int s_jquota_fmt; /* Format of quota to use */ 1575 #endif 1576 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1577 struct ext4_system_blocks __rcu *s_system_blks; 1578 1579 #ifdef EXTENTS_STATS 1580 /* ext4 extents stats */ 1581 unsigned long s_ext_min; 1582 unsigned long s_ext_max; 1583 unsigned long s_depth_max; 1584 spinlock_t s_ext_stats_lock; 1585 unsigned long s_ext_blocks; 1586 unsigned long s_ext_extents; 1587 #endif 1588 1589 /* for buddy allocator */ 1590 struct ext4_group_info ** __rcu *s_group_info; 1591 struct inode *s_buddy_cache; 1592 spinlock_t s_md_lock; 1593 unsigned short *s_mb_offsets; 1594 unsigned int *s_mb_maxs; 1595 unsigned int s_group_info_size; 1596 atomic_t s_mb_free_pending; 1597 struct list_head s_freed_data_list[2]; /* List of blocks to be freed 1598 after commit completed */ 1599 struct list_head s_discard_list; 1600 struct work_struct s_discard_work; 1601 atomic_t s_retry_alloc_pending; 1602 struct xarray *s_mb_avg_fragment_size; 1603 struct xarray *s_mb_largest_free_orders; 1604 1605 /* tunables */ 1606 unsigned long s_stripe; 1607 unsigned int s_mb_max_linear_groups; 1608 unsigned int s_mb_stream_request; 1609 unsigned int s_mb_max_to_scan; 1610 unsigned int s_mb_min_to_scan; 1611 unsigned int s_mb_stats; 1612 unsigned int s_mb_order2_reqs; 1613 unsigned int s_mb_group_prealloc; 1614 unsigned int s_max_dir_size_kb; 1615 unsigned int s_mb_prefetch; 1616 unsigned int s_mb_prefetch_limit; 1617 unsigned int s_mb_best_avail_max_trim_order; 1618 unsigned int s_sb_update_sec; 1619 unsigned int s_sb_update_kb; 1620 1621 /* where last allocation was done - for stream allocation */ 1622 ext4_group_t *s_mb_last_groups; 1623 unsigned int s_mb_nr_global_goals; 1624 1625 /* stats for buddy allocator */ 1626 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1627 atomic_t s_bal_success; /* we found long enough chunks */ 1628 atomic_t s_bal_allocated; /* in blocks */ 1629 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1630 atomic_t s_bal_cX_ex_scanned[EXT4_MB_NUM_CRS]; /* total extents scanned */ 1631 atomic_t s_bal_groups_scanned; /* number of groups scanned */ 1632 atomic_t s_bal_goals; /* goal hits */ 1633 atomic_t s_bal_stream_goals; /* stream allocation global goal hits */ 1634 atomic_t s_bal_len_goals; /* len goal hits */ 1635 atomic_t s_bal_breaks; /* too long searches */ 1636 atomic_t s_bal_2orders; /* 2^order hits */ 1637 atomic64_t s_bal_cX_groups_considered[EXT4_MB_NUM_CRS]; 1638 atomic64_t s_bal_cX_hits[EXT4_MB_NUM_CRS]; 1639 atomic64_t s_bal_cX_failed[EXT4_MB_NUM_CRS]; /* cX loop didn't find blocks */ 1640 atomic_t s_mb_buddies_generated; /* number of buddies generated */ 1641 atomic64_t s_mb_generation_time; 1642 atomic_t s_mb_lost_chunks; 1643 atomic_t s_mb_preallocated; 1644 atomic_t s_mb_discarded; 1645 atomic_t s_lock_busy; 1646 1647 /* locality groups */ 1648 struct ext4_locality_group __percpu *s_locality_groups; 1649 1650 /* for write statistics */ 1651 unsigned long s_sectors_written_start; 1652 u64 s_kbytes_written; 1653 1654 /* the size of zero-out chunk */ 1655 unsigned int s_extent_max_zeroout_kb; 1656 1657 unsigned int s_log_groups_per_flex; 1658 struct flex_groups * __rcu *s_flex_groups; 1659 ext4_group_t s_flex_groups_allocated; 1660 1661 /* workqueue for reserved extent conversions (buffered io) */ 1662 struct workqueue_struct *rsv_conversion_wq; 1663 1664 /* timer for periodic error stats printing */ 1665 struct timer_list s_err_report; 1666 1667 /* Lazy inode table initialization info */ 1668 struct ext4_li_request *s_li_request; 1669 /* Wait multiplier for lazy initialization thread */ 1670 unsigned int s_li_wait_mult; 1671 1672 /* Kernel thread for multiple mount protection */ 1673 struct task_struct *s_mmp_tsk; 1674 1675 /* record the last minlen when FITRIM is called. */ 1676 unsigned long s_last_trim_minblks; 1677 1678 /* Precomputed FS UUID checksum for seeding other checksums */ 1679 __u32 s_csum_seed; 1680 1681 /* Reclaim extents from extent status tree */ 1682 struct shrinker *s_es_shrinker; 1683 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1684 long s_es_nr_inode; 1685 struct ext4_es_stats s_es_stats; 1686 struct mb_cache *s_ea_block_cache; 1687 struct mb_cache *s_ea_inode_cache; 1688 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1689 1690 /* Journal triggers for checksum computation */ 1691 struct ext4_journal_trigger s_journal_triggers[EXT4_JOURNAL_TRIGGER_COUNT]; 1692 1693 /* Ratelimit ext4 messages. */ 1694 struct ratelimit_state s_err_ratelimit_state; 1695 struct ratelimit_state s_warning_ratelimit_state; 1696 struct ratelimit_state s_msg_ratelimit_state; 1697 atomic_t s_warning_count; 1698 atomic_t s_msg_count; 1699 1700 /* Encryption policy for '-o test_dummy_encryption' */ 1701 struct fscrypt_dummy_policy s_dummy_enc_policy; 1702 1703 /* 1704 * Barrier between writepages ops and changing any inode's JOURNAL_DATA 1705 * or EXTENTS flag or between writepages ops and changing DELALLOC or 1706 * DIOREAD_NOLOCK mount options on remount. 1707 */ 1708 struct percpu_rw_semaphore s_writepages_rwsem; 1709 struct dax_device *s_daxdev; 1710 u64 s_dax_part_off; 1711 #ifdef CONFIG_EXT4_DEBUG 1712 unsigned long s_simulate_fail; 1713 #endif 1714 /* Record the errseq of the backing block device */ 1715 errseq_t s_bdev_wb_err; 1716 spinlock_t s_bdev_wb_lock; 1717 1718 /* Information about errors that happened during this mount */ 1719 spinlock_t s_error_lock; 1720 int s_add_error_count; 1721 int s_first_error_code; 1722 __u32 s_first_error_line; 1723 __u32 s_first_error_ino; 1724 __u64 s_first_error_block; 1725 const char *s_first_error_func; 1726 time64_t s_first_error_time; 1727 int s_last_error_code; 1728 __u32 s_last_error_line; 1729 __u32 s_last_error_ino; 1730 __u64 s_last_error_block; 1731 const char *s_last_error_func; 1732 time64_t s_last_error_time; 1733 /* 1734 * If we are in a context where we cannot update the on-disk 1735 * superblock, we queue the work here. This is used to update 1736 * the error information in the superblock, and for periodic 1737 * updates of the superblock called from the commit callback 1738 * function. 1739 */ 1740 struct work_struct s_sb_upd_work; 1741 1742 /* Atomic write unit values in bytes */ 1743 unsigned int s_awu_min; 1744 unsigned int s_awu_max; 1745 1746 /* Ext4 fast commit sub transaction ID */ 1747 atomic_t s_fc_subtid; 1748 1749 /* 1750 * After commit starts, the main queue gets locked, and the further 1751 * updates get added in the staging queue. 1752 */ 1753 #define FC_Q_MAIN 0 1754 #define FC_Q_STAGING 1 1755 struct list_head s_fc_q[2]; /* Inodes staged for fast commit 1756 * that have data changes in them. 1757 */ 1758 struct list_head s_fc_dentry_q[2]; /* directory entry updates */ 1759 unsigned int s_fc_bytes; 1760 /* 1761 * Main fast commit lock. This lock protects accesses to the 1762 * following fields: 1763 * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh. 1764 */ 1765 struct mutex s_fc_lock; 1766 struct buffer_head *s_fc_bh; 1767 struct ext4_fc_stats s_fc_stats; 1768 tid_t s_fc_ineligible_tid; 1769 #ifdef CONFIG_EXT4_DEBUG 1770 int s_fc_debug_max_replay; 1771 #endif 1772 struct ext4_fc_replay_state s_fc_replay_state; 1773 }; 1774 1775 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1776 { 1777 return sb->s_fs_info; 1778 } 1779 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1780 { 1781 return container_of(inode, struct ext4_inode_info, vfs_inode); 1782 } 1783 1784 static inline int ext4_writepages_down_read(struct super_block *sb) 1785 { 1786 percpu_down_read(&EXT4_SB(sb)->s_writepages_rwsem); 1787 return memalloc_nofs_save(); 1788 } 1789 1790 static inline void ext4_writepages_up_read(struct super_block *sb, int ctx) 1791 { 1792 memalloc_nofs_restore(ctx); 1793 percpu_up_read(&EXT4_SB(sb)->s_writepages_rwsem); 1794 } 1795 1796 static inline int ext4_writepages_down_write(struct super_block *sb) 1797 { 1798 percpu_down_write(&EXT4_SB(sb)->s_writepages_rwsem); 1799 return memalloc_nofs_save(); 1800 } 1801 1802 static inline void ext4_writepages_up_write(struct super_block *sb, int ctx) 1803 { 1804 memalloc_nofs_restore(ctx); 1805 percpu_up_write(&EXT4_SB(sb)->s_writepages_rwsem); 1806 } 1807 1808 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1809 { 1810 return ino == EXT4_ROOT_INO || 1811 (ino >= EXT4_FIRST_INO(sb) && 1812 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1813 } 1814 1815 /* 1816 * Returns: sbi->field[index] 1817 * Used to access an array element from the following sbi fields which require 1818 * rcu protection to avoid dereferencing an invalid pointer due to reassignment 1819 * - s_group_desc 1820 * - s_group_info 1821 * - s_flex_group 1822 */ 1823 #define sbi_array_rcu_deref(sbi, field, index) \ 1824 ({ \ 1825 typeof(*((sbi)->field)) _v; \ 1826 rcu_read_lock(); \ 1827 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \ 1828 rcu_read_unlock(); \ 1829 _v; \ 1830 }) 1831 1832 /* 1833 * run-time mount flags 1834 */ 1835 enum { 1836 EXT4_MF_MNTDIR_SAMPLED, 1837 EXT4_MF_FC_INELIGIBLE, /* Fast commit ineligible */ 1838 EXT4_MF_JOURNAL_DESTROY /* Journal is in process of destroying */ 1839 }; 1840 1841 static inline void ext4_set_mount_flag(struct super_block *sb, int bit) 1842 { 1843 set_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1844 } 1845 1846 static inline void ext4_clear_mount_flag(struct super_block *sb, int bit) 1847 { 1848 clear_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1849 } 1850 1851 static inline int ext4_test_mount_flag(struct super_block *sb, int bit) 1852 { 1853 return test_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1854 } 1855 1856 1857 /* 1858 * Simulate_fail codes 1859 */ 1860 #define EXT4_SIM_BBITMAP_EIO 1 1861 #define EXT4_SIM_BBITMAP_CRC 2 1862 #define EXT4_SIM_IBITMAP_EIO 3 1863 #define EXT4_SIM_IBITMAP_CRC 4 1864 #define EXT4_SIM_INODE_EIO 5 1865 #define EXT4_SIM_INODE_CRC 6 1866 #define EXT4_SIM_DIRBLOCK_EIO 7 1867 #define EXT4_SIM_DIRBLOCK_CRC 8 1868 1869 static inline bool ext4_simulate_fail(struct super_block *sb, 1870 unsigned long code) 1871 { 1872 #ifdef CONFIG_EXT4_DEBUG 1873 struct ext4_sb_info *sbi = EXT4_SB(sb); 1874 1875 if (unlikely(sbi->s_simulate_fail == code)) { 1876 sbi->s_simulate_fail = 0; 1877 return true; 1878 } 1879 #endif 1880 return false; 1881 } 1882 1883 /* 1884 * Error number codes for s_{first,last}_error_errno 1885 * 1886 * Linux errno numbers are architecture specific, so we need to translate 1887 * them into something which is architecture independent. We don't define 1888 * codes for all errno's; just the ones which are most likely to be the cause 1889 * of an ext4_error() call. 1890 */ 1891 #define EXT4_ERR_UNKNOWN 1 1892 #define EXT4_ERR_EIO 2 1893 #define EXT4_ERR_ENOMEM 3 1894 #define EXT4_ERR_EFSBADCRC 4 1895 #define EXT4_ERR_EFSCORRUPTED 5 1896 #define EXT4_ERR_ENOSPC 6 1897 #define EXT4_ERR_ENOKEY 7 1898 #define EXT4_ERR_EROFS 8 1899 #define EXT4_ERR_EFBIG 9 1900 #define EXT4_ERR_EEXIST 10 1901 #define EXT4_ERR_ERANGE 11 1902 #define EXT4_ERR_EOVERFLOW 12 1903 #define EXT4_ERR_EBUSY 13 1904 #define EXT4_ERR_ENOTDIR 14 1905 #define EXT4_ERR_ENOTEMPTY 15 1906 #define EXT4_ERR_ESHUTDOWN 16 1907 #define EXT4_ERR_EFAULT 17 1908 1909 /* 1910 * Inode dynamic state flags 1911 */ 1912 enum { 1913 EXT4_STATE_NEW, /* inode is newly created */ 1914 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1915 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1916 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1917 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1918 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1919 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1920 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1921 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */ 1922 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */ 1923 EXT4_STATE_FC_COMMITTING, /* Fast commit ongoing */ 1924 EXT4_STATE_FC_FLUSHING_DATA, /* Fast commit flushing data */ 1925 EXT4_STATE_ORPHAN_FILE, /* Inode orphaned in orphan file */ 1926 }; 1927 1928 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1929 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1930 { \ 1931 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1932 } \ 1933 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1934 { \ 1935 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1936 } \ 1937 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1938 { \ 1939 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1940 } 1941 1942 /* Add these declarations here only so that these functions can be 1943 * found by name. Otherwise, they are very hard to locate. */ 1944 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1945 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1946 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1947 EXT4_INODE_BIT_FNS(flag, flags, 0) 1948 1949 /* Add these declarations here only so that these functions can be 1950 * found by name. Otherwise, they are very hard to locate. */ 1951 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1952 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1953 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1954 #if (BITS_PER_LONG < 64) 1955 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1956 1957 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1958 { 1959 (ei)->i_state_flags = 0; 1960 } 1961 #else 1962 EXT4_INODE_BIT_FNS(state, flags, 32) 1963 1964 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1965 { 1966 /* We depend on the fact that callers will set i_flags */ 1967 } 1968 #endif 1969 #else 1970 /* Assume that user mode programs are passing in an ext4fs superblock, not 1971 * a kernel struct super_block. This will allow us to call the feature-test 1972 * macros from user land. */ 1973 #define EXT4_SB(sb) (sb) 1974 #endif 1975 1976 static inline bool ext4_verity_in_progress(struct inode *inode) 1977 { 1978 return IS_ENABLED(CONFIG_FS_VERITY) && 1979 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS); 1980 } 1981 1982 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1983 1984 /* 1985 * Codes for operating systems 1986 */ 1987 #define EXT4_OS_LINUX 0 1988 #define EXT4_OS_HURD 1 1989 #define EXT4_OS_MASIX 2 1990 #define EXT4_OS_FREEBSD 3 1991 #define EXT4_OS_LITES 4 1992 1993 /* 1994 * Revision levels 1995 */ 1996 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1997 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1998 1999 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 2000 2001 #define EXT4_GOOD_OLD_INODE_SIZE 128 2002 2003 #define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN) 2004 #define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX 2005 #define EXT4_TIMESTAMP_MIN S32_MIN 2006 2007 /* 2008 * Feature set definitions 2009 */ 2010 2011 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 2012 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 2013 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 2014 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 2015 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 2016 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 2017 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 2018 /* 2019 * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes 2020 * incompatible only if fast commit blocks are present in the FS. Since we 2021 * clear the journal (and thus the fast commit blocks), we don't mark FS as 2022 * incompatible. We also have a JBD2 incompat feature, which gets set when 2023 * there are fast commit blocks present in the journal. 2024 */ 2025 #define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400 2026 #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800 2027 #define EXT4_FEATURE_COMPAT_ORPHAN_FILE 0x1000 /* Orphan file exists */ 2028 2029 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 2030 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 2031 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 2032 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 2033 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 2034 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 2035 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 2036 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 2037 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 2038 /* 2039 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 2040 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 2041 * all other data structures' checksums. However, the METADATA_CSUM and 2042 * GDT_CSUM bits are mutually exclusive. 2043 */ 2044 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 2045 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 2046 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 2047 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000 2048 #define EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT 0x10000 /* Orphan file may be 2049 non-empty */ 2050 2051 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 2052 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 2053 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 2054 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 2055 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 2056 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 2057 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 2058 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 2059 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 2060 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 2061 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 2062 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 2063 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 2064 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 2065 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 2066 #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000 2067 2068 extern void ext4_update_dynamic_rev(struct super_block *sb); 2069 2070 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 2071 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 2072 { \ 2073 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 2074 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 2075 } \ 2076 static inline void ext4_set_feature_##name(struct super_block *sb) \ 2077 { \ 2078 ext4_update_dynamic_rev(sb); \ 2079 EXT4_SB(sb)->s_es->s_feature_compat |= \ 2080 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 2081 } \ 2082 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 2083 { \ 2084 EXT4_SB(sb)->s_es->s_feature_compat &= \ 2085 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 2086 } 2087 2088 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 2089 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 2090 { \ 2091 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 2092 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 2093 } \ 2094 static inline void ext4_set_feature_##name(struct super_block *sb) \ 2095 { \ 2096 ext4_update_dynamic_rev(sb); \ 2097 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 2098 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 2099 } \ 2100 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 2101 { \ 2102 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 2103 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 2104 } 2105 2106 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 2107 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 2108 { \ 2109 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 2110 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 2111 } \ 2112 static inline void ext4_set_feature_##name(struct super_block *sb) \ 2113 { \ 2114 ext4_update_dynamic_rev(sb); \ 2115 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 2116 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 2117 } \ 2118 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 2119 { \ 2120 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 2121 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 2122 } 2123 2124 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 2125 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 2126 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 2127 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 2128 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 2129 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 2130 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 2131 EXT4_FEATURE_COMPAT_FUNCS(fast_commit, FAST_COMMIT) 2132 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES) 2133 EXT4_FEATURE_COMPAT_FUNCS(orphan_file, ORPHAN_FILE) 2134 2135 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 2136 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 2137 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 2138 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 2139 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 2140 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 2141 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 2142 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 2143 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 2144 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 2145 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 2146 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 2147 EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY) 2148 EXT4_FEATURE_RO_COMPAT_FUNCS(orphan_present, ORPHAN_PRESENT) 2149 2150 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 2151 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 2152 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 2153 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 2154 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 2155 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 2156 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 2157 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 2158 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 2159 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 2160 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 2161 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 2162 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 2163 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 2164 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 2165 EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD) 2166 2167 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2168 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2169 EXT4_FEATURE_INCOMPAT_META_BG) 2170 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2171 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2172 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 2173 2174 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2175 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2176 EXT4_FEATURE_INCOMPAT_RECOVER| \ 2177 EXT4_FEATURE_INCOMPAT_META_BG) 2178 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2179 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2180 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 2181 2182 #define EXT4_FEATURE_COMPAT_SUPP (EXT4_FEATURE_COMPAT_EXT_ATTR| \ 2183 EXT4_FEATURE_COMPAT_ORPHAN_FILE) 2184 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2185 EXT4_FEATURE_INCOMPAT_RECOVER| \ 2186 EXT4_FEATURE_INCOMPAT_META_BG| \ 2187 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 2188 EXT4_FEATURE_INCOMPAT_64BIT| \ 2189 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 2190 EXT4_FEATURE_INCOMPAT_EA_INODE| \ 2191 EXT4_FEATURE_INCOMPAT_MMP | \ 2192 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 2193 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 2194 EXT4_FEATURE_INCOMPAT_CASEFOLD | \ 2195 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \ 2196 EXT4_FEATURE_INCOMPAT_LARGEDIR) 2197 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2198 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2199 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 2200 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 2201 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 2202 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 2203 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 2204 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 2205 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 2206 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 2207 EXT4_FEATURE_RO_COMPAT_PROJECT |\ 2208 EXT4_FEATURE_RO_COMPAT_VERITY |\ 2209 EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT) 2210 2211 #define EXTN_FEATURE_FUNCS(ver) \ 2212 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 2213 { \ 2214 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 2215 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 2216 } \ 2217 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 2218 { \ 2219 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 2220 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 2221 } \ 2222 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 2223 { \ 2224 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 2225 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 2226 } 2227 2228 EXTN_FEATURE_FUNCS(2) 2229 EXTN_FEATURE_FUNCS(3) 2230 EXTN_FEATURE_FUNCS(4) 2231 2232 static inline bool ext4_has_compat_features(struct super_block *sb) 2233 { 2234 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 2235 } 2236 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 2237 { 2238 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 2239 } 2240 static inline bool ext4_has_incompat_features(struct super_block *sb) 2241 { 2242 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 2243 } 2244 2245 extern int ext4_feature_set_ok(struct super_block *sb, int readonly); 2246 2247 /* 2248 * Superblock flags 2249 */ 2250 enum { 2251 EXT4_FLAGS_RESIZING, /* Avoid superblock update and resize race */ 2252 EXT4_FLAGS_SHUTDOWN, /* Prevent access to the file system */ 2253 EXT4_FLAGS_BDEV_IS_DAX, /* Current block device support DAX */ 2254 EXT4_FLAGS_EMERGENCY_RO,/* Emergency read-only due to fs errors */ 2255 }; 2256 2257 static inline int ext4_forced_shutdown(struct super_block *sb) 2258 { 2259 return test_bit(EXT4_FLAGS_SHUTDOWN, &EXT4_SB(sb)->s_ext4_flags); 2260 } 2261 2262 static inline int ext4_emergency_ro(struct super_block *sb) 2263 { 2264 return test_bit(EXT4_FLAGS_EMERGENCY_RO, &EXT4_SB(sb)->s_ext4_flags); 2265 } 2266 2267 static inline int ext4_emergency_state(struct super_block *sb) 2268 { 2269 if (unlikely(ext4_forced_shutdown(sb))) 2270 return -EIO; 2271 if (unlikely(ext4_emergency_ro(sb))) 2272 return -EROFS; 2273 return 0; 2274 } 2275 2276 /* 2277 * Default values for user and/or group using reserved blocks 2278 */ 2279 #define EXT4_DEF_RESUID 0 2280 #define EXT4_DEF_RESGID 0 2281 2282 /* 2283 * Default project ID 2284 */ 2285 #define EXT4_DEF_PROJID 0 2286 2287 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 2288 2289 /* 2290 * Default mount options 2291 */ 2292 #define EXT4_DEFM_DEBUG 0x0001 2293 #define EXT4_DEFM_BSDGROUPS 0x0002 2294 #define EXT4_DEFM_XATTR_USER 0x0004 2295 #define EXT4_DEFM_ACL 0x0008 2296 #define EXT4_DEFM_UID16 0x0010 2297 #define EXT4_DEFM_JMODE 0x0060 2298 #define EXT4_DEFM_JMODE_DATA 0x0020 2299 #define EXT4_DEFM_JMODE_ORDERED 0x0040 2300 #define EXT4_DEFM_JMODE_WBACK 0x0060 2301 #define EXT4_DEFM_NOBARRIER 0x0100 2302 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 2303 #define EXT4_DEFM_DISCARD 0x0400 2304 #define EXT4_DEFM_NODELALLOC 0x0800 2305 2306 /* 2307 * Default journal batch times and ioprio. 2308 */ 2309 #define EXT4_DEF_MIN_BATCH_TIME 0 2310 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 2311 #define EXT4_DEF_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3)) 2312 2313 2314 /* 2315 * Default values for superblock update 2316 */ 2317 #define EXT4_DEF_SB_UPDATE_INTERVAL_SEC (3600) /* seconds (1 hour) */ 2318 #define EXT4_DEF_SB_UPDATE_INTERVAL_KB (16384) /* kilobytes (16MB) */ 2319 2320 2321 /* 2322 * Minimum number of groups in a flexgroup before we separate out 2323 * directories into the first block group of a flexgroup 2324 */ 2325 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 2326 2327 /* 2328 * Structure of a directory entry 2329 */ 2330 #define EXT4_NAME_LEN 255 2331 /* 2332 * Base length of the ext4 directory entry excluding the name length 2333 */ 2334 #define EXT4_BASE_DIR_LEN (sizeof(struct ext4_dir_entry_2) - EXT4_NAME_LEN) 2335 2336 struct ext4_dir_entry { 2337 __le32 inode; /* Inode number */ 2338 __le16 rec_len; /* Directory entry length */ 2339 __le16 name_len; /* Name length */ 2340 char name[EXT4_NAME_LEN]; /* File name */ 2341 }; 2342 2343 2344 /* 2345 * Encrypted Casefolded entries require saving the hash on disk. This structure 2346 * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned 2347 * boundary. 2348 */ 2349 struct ext4_dir_entry_hash { 2350 __le32 hash; 2351 __le32 minor_hash; 2352 }; 2353 2354 /* 2355 * The new version of the directory entry. Since EXT4 structures are 2356 * stored in intel byte order, and the name_len field could never be 2357 * bigger than 255 chars, it's safe to reclaim the extra byte for the 2358 * file_type field. 2359 */ 2360 struct ext4_dir_entry_2 { 2361 __le32 inode; /* Inode number */ 2362 __le16 rec_len; /* Directory entry length */ 2363 __u8 name_len; /* Name length */ 2364 __u8 file_type; /* See file type macros EXT4_FT_* below */ 2365 char name[EXT4_NAME_LEN]; /* File name */ 2366 }; 2367 2368 /* 2369 * Access the hashes at the end of ext4_dir_entry_2 2370 */ 2371 #define EXT4_DIRENT_HASHES(entry) \ 2372 ((struct ext4_dir_entry_hash *) \ 2373 (((void *)(entry)) + \ 2374 ((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND))) 2375 #define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(entry)->hash) 2376 #define EXT4_DIRENT_MINOR_HASH(entry) \ 2377 le32_to_cpu(EXT4_DIRENT_HASHES(entry)->minor_hash) 2378 2379 static inline bool ext4_hash_in_dirent(const struct inode *inode) 2380 { 2381 return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode); 2382 } 2383 2384 /* 2385 * This is a bogus directory entry at the end of each leaf block that 2386 * records checksums. 2387 */ 2388 struct ext4_dir_entry_tail { 2389 __le32 det_reserved_zero1; /* Pretend to be unused */ 2390 __le16 det_rec_len; /* 12 */ 2391 __u8 det_reserved_zero2; /* Zero name length */ 2392 __u8 det_reserved_ft; /* 0xDE, fake file type */ 2393 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 2394 }; 2395 2396 #define EXT4_DIRENT_TAIL(block, blocksize) \ 2397 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 2398 ((blocksize) - \ 2399 sizeof(struct ext4_dir_entry_tail)))) 2400 2401 /* 2402 * Ext4 directory file types. Only the low 3 bits are used. The 2403 * other bits are reserved for now. 2404 */ 2405 #define EXT4_FT_UNKNOWN 0 2406 #define EXT4_FT_REG_FILE 1 2407 #define EXT4_FT_DIR 2 2408 #define EXT4_FT_CHRDEV 3 2409 #define EXT4_FT_BLKDEV 4 2410 #define EXT4_FT_FIFO 5 2411 #define EXT4_FT_SOCK 6 2412 #define EXT4_FT_SYMLINK 7 2413 2414 #define EXT4_FT_MAX 8 2415 2416 #define EXT4_FT_DIR_CSUM 0xDE 2417 2418 /* 2419 * EXT4_DIR_PAD defines the directory entries boundaries 2420 * 2421 * NOTE: It must be a multiple of 4 2422 */ 2423 #define EXT4_DIR_PAD 4 2424 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 2425 #define EXT4_MAX_REC_LEN ((1<<16)-1) 2426 2427 /* 2428 * The rec_len is dependent on the type of directory. Directories that are 2429 * casefolded and encrypted need to store the hash as well, so we add room for 2430 * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should 2431 * pass NULL for dir, as those entries do not use the extra fields. 2432 */ 2433 static inline unsigned int ext4_dir_rec_len(__u8 name_len, 2434 const struct inode *dir) 2435 { 2436 int rec_len = (name_len + 8 + EXT4_DIR_ROUND); 2437 2438 if (dir && ext4_hash_in_dirent(dir)) 2439 rec_len += sizeof(struct ext4_dir_entry_hash); 2440 return (rec_len & ~EXT4_DIR_ROUND); 2441 } 2442 2443 /* 2444 * If we ever get support for fs block sizes > page_size, we'll need 2445 * to remove the #if statements in the next two functions... 2446 */ 2447 static inline unsigned int 2448 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 2449 { 2450 unsigned len = le16_to_cpu(dlen); 2451 2452 #if (PAGE_SIZE >= 65536) 2453 if (len == EXT4_MAX_REC_LEN || len == 0) 2454 return blocksize; 2455 return (len & 65532) | ((len & 3) << 16); 2456 #else 2457 return len; 2458 #endif 2459 } 2460 2461 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 2462 { 2463 BUG_ON((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)); 2464 #if (PAGE_SIZE >= 65536) 2465 if (len < 65536) 2466 return cpu_to_le16(len); 2467 if (len == blocksize) { 2468 if (blocksize == 65536) 2469 return cpu_to_le16(EXT4_MAX_REC_LEN); 2470 else 2471 return cpu_to_le16(0); 2472 } 2473 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 2474 #else 2475 return cpu_to_le16(len); 2476 #endif 2477 } 2478 2479 /* 2480 * Hash Tree Directory indexing 2481 * (c) Daniel Phillips, 2001 2482 */ 2483 2484 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2485 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2486 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \ 2487 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir))) 2488 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2489 2490 /* Legal values for the dx_root hash_version field: */ 2491 2492 #define DX_HASH_LEGACY 0 2493 #define DX_HASH_HALF_MD4 1 2494 #define DX_HASH_TEA 2 2495 #define DX_HASH_LEGACY_UNSIGNED 3 2496 #define DX_HASH_HALF_MD4_UNSIGNED 4 2497 #define DX_HASH_TEA_UNSIGNED 5 2498 #define DX_HASH_SIPHASH 6 2499 #define DX_HASH_LAST DX_HASH_SIPHASH 2500 2501 static inline u32 ext4_chksum(u32 crc, const void *address, unsigned int length) 2502 { 2503 return crc32c(crc, address, length); 2504 } 2505 2506 #ifdef __KERNEL__ 2507 2508 /* hash info structure used by the directory hash */ 2509 struct dx_hash_info 2510 { 2511 u32 hash; 2512 u32 minor_hash; 2513 int hash_version; 2514 u32 *seed; 2515 }; 2516 2517 2518 /* 32 and 64 bit signed EOF for dx directories */ 2519 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2520 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2521 2522 2523 /* 2524 * Control parameters used by ext4_htree_next_block 2525 */ 2526 #define HASH_NB_ALWAYS 1 2527 2528 struct ext4_filename { 2529 const struct qstr *usr_fname; 2530 struct fscrypt_str disk_name; 2531 struct dx_hash_info hinfo; 2532 #ifdef CONFIG_FS_ENCRYPTION 2533 struct fscrypt_str crypto_buf; 2534 #endif 2535 #if IS_ENABLED(CONFIG_UNICODE) 2536 struct qstr cf_name; 2537 #endif 2538 }; 2539 2540 #define fname_name(p) ((p)->disk_name.name) 2541 #define fname_usr_name(p) ((p)->usr_fname->name) 2542 #define fname_len(p) ((p)->disk_name.len) 2543 2544 /* 2545 * Describe an inode's exact location on disk and in memory 2546 */ 2547 struct ext4_iloc 2548 { 2549 struct buffer_head *bh; 2550 unsigned long offset; 2551 ext4_group_t block_group; 2552 }; 2553 2554 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2555 { 2556 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2557 } 2558 2559 static inline bool ext4_is_quota_file(struct inode *inode) 2560 { 2561 return IS_NOQUOTA(inode) && 2562 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL); 2563 } 2564 2565 /* 2566 * This structure is stuffed into the struct file's private_data field 2567 * for directories. It is where we put information so that we can do 2568 * readdir operations in hash tree order. 2569 */ 2570 struct dir_private_info { 2571 struct rb_root root; 2572 struct rb_node *curr_node; 2573 struct fname *extra_fname; 2574 loff_t last_pos; 2575 __u32 curr_hash; 2576 __u32 curr_minor_hash; 2577 __u32 next_hash; 2578 u64 cookie; 2579 bool initialized; 2580 }; 2581 2582 /* calculate the first block number of the group */ 2583 static inline ext4_fsblk_t 2584 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2585 { 2586 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2587 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2588 } 2589 2590 /* 2591 * Special error return code only used by dx_probe() and its callers. 2592 */ 2593 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2594 2595 /* htree levels for ext4 */ 2596 #define EXT4_HTREE_LEVEL_COMPAT 2 2597 #define EXT4_HTREE_LEVEL 3 2598 2599 static inline int ext4_dir_htree_level(struct super_block *sb) 2600 { 2601 return ext4_has_feature_largedir(sb) ? 2602 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT; 2603 } 2604 2605 /* 2606 * Timeout and state flag for lazy initialization inode thread. 2607 */ 2608 #define EXT4_DEF_LI_WAIT_MULT 10 2609 #define EXT4_DEF_LI_MAX_START_DELAY 5 2610 #define EXT4_LAZYINIT_QUIT 0x0001 2611 #define EXT4_LAZYINIT_RUNNING 0x0002 2612 2613 /* 2614 * Lazy inode table initialization info 2615 */ 2616 struct ext4_lazy_init { 2617 unsigned long li_state; 2618 struct list_head li_request_list; 2619 struct mutex li_list_mtx; 2620 }; 2621 2622 enum ext4_li_mode { 2623 EXT4_LI_MODE_PREFETCH_BBITMAP, 2624 EXT4_LI_MODE_ITABLE, 2625 }; 2626 2627 struct ext4_li_request { 2628 struct super_block *lr_super; 2629 enum ext4_li_mode lr_mode; 2630 ext4_group_t lr_first_not_zeroed; 2631 ext4_group_t lr_next_group; 2632 struct list_head lr_request; 2633 unsigned long lr_next_sched; 2634 unsigned long lr_timeout; 2635 }; 2636 2637 struct ext4_features { 2638 struct kobject f_kobj; 2639 struct completion f_kobj_unregister; 2640 }; 2641 2642 /* 2643 * This structure will be used for multiple mount protection. It will be 2644 * written into the block number saved in the s_mmp_block field in the 2645 * superblock. Programs that check MMP should assume that if 2646 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2647 * to use the filesystem, regardless of how old the timestamp is. 2648 */ 2649 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2650 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2651 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2652 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2653 2654 struct mmp_struct { 2655 __le32 mmp_magic; /* Magic number for MMP */ 2656 __le32 mmp_seq; /* Sequence no. updated periodically */ 2657 2658 /* 2659 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2660 * purposes and do not affect the correctness of the algorithm 2661 */ 2662 __le64 mmp_time; /* Time last updated */ 2663 char mmp_nodename[64]; /* Node which last updated MMP block */ 2664 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2665 2666 /* 2667 * mmp_check_interval is used to verify if the MMP block has been 2668 * updated on the block device. The value is updated based on the 2669 * maximum time to write the MMP block during an update cycle. 2670 */ 2671 __le16 mmp_check_interval; 2672 2673 __le16 mmp_pad1; 2674 __le32 mmp_pad2[226]; 2675 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2676 }; 2677 2678 /* arguments passed to the mmp thread */ 2679 struct mmpd_data { 2680 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2681 struct super_block *sb; /* super block of the fs */ 2682 }; 2683 2684 /* 2685 * Check interval multiplier 2686 * The MMP block is written every update interval and initially checked every 2687 * update interval x the multiplier (the value is then adapted based on the 2688 * write latency). The reason is that writes can be delayed under load and we 2689 * don't want readers to incorrectly assume that the filesystem is no longer 2690 * in use. 2691 */ 2692 #define EXT4_MMP_CHECK_MULT 2UL 2693 2694 /* 2695 * Minimum interval for MMP checking in seconds. 2696 */ 2697 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2698 2699 /* 2700 * Maximum interval for MMP checking in seconds. 2701 */ 2702 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2703 2704 /* 2705 * Function prototypes 2706 */ 2707 2708 /* 2709 * Ok, these declarations are also in <linux/kernel.h> but none of the 2710 * ext4 source programs needs to include it so they are duplicated here. 2711 */ 2712 # define NORET_TYPE /**/ 2713 # define ATTRIB_NORET __attribute__((noreturn)) 2714 # define NORET_AND noreturn, 2715 2716 /* bitmap.c */ 2717 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2718 void ext4_inode_bitmap_csum_set(struct super_block *sb, 2719 struct ext4_group_desc *gdp, 2720 struct buffer_head *bh); 2721 int ext4_inode_bitmap_csum_verify(struct super_block *sb, 2722 struct ext4_group_desc *gdp, 2723 struct buffer_head *bh); 2724 void ext4_block_bitmap_csum_set(struct super_block *sb, 2725 struct ext4_group_desc *gdp, 2726 struct buffer_head *bh); 2727 int ext4_block_bitmap_csum_verify(struct super_block *sb, 2728 struct ext4_group_desc *gdp, 2729 struct buffer_head *bh); 2730 2731 /* balloc.c */ 2732 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2733 ext4_fsblk_t blocknr, 2734 ext4_group_t *blockgrpp, 2735 ext4_grpblk_t *offsetp); 2736 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2737 ext4_fsblk_t block); 2738 2739 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2740 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2741 ext4_group_t group); 2742 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2743 ext4_fsblk_t goal, 2744 unsigned int flags, 2745 unsigned long *count, 2746 int *errp); 2747 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2748 s64 nclusters, unsigned int flags); 2749 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2750 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2751 ext4_group_t block_group, 2752 struct buffer_head ** bh); 2753 extern struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2754 ext4_group_t group); 2755 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2756 2757 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2758 ext4_group_t block_group, 2759 bool ignore_locked); 2760 extern int ext4_wait_block_bitmap(struct super_block *sb, 2761 ext4_group_t block_group, 2762 struct buffer_head *bh); 2763 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2764 ext4_group_t block_group); 2765 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2766 ext4_group_t block_group, 2767 struct ext4_group_desc *gdp); 2768 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2769 2770 #if IS_ENABLED(CONFIG_UNICODE) 2771 extern int ext4_fname_setup_ci_filename(struct inode *dir, 2772 const struct qstr *iname, 2773 struct ext4_filename *fname); 2774 2775 static inline void ext4_fname_free_ci_filename(struct ext4_filename *fname) 2776 { 2777 kfree(fname->cf_name.name); 2778 fname->cf_name.name = NULL; 2779 } 2780 #else 2781 static inline int ext4_fname_setup_ci_filename(struct inode *dir, 2782 const struct qstr *iname, 2783 struct ext4_filename *fname) 2784 { 2785 return 0; 2786 } 2787 2788 static inline void ext4_fname_free_ci_filename(struct ext4_filename *fname) 2789 { 2790 } 2791 #endif 2792 2793 /* ext4 encryption related stuff goes here crypto.c */ 2794 #ifdef CONFIG_FS_ENCRYPTION 2795 extern const struct fscrypt_operations ext4_cryptops; 2796 2797 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname, 2798 int lookup, struct ext4_filename *fname); 2799 2800 int ext4_fname_prepare_lookup(struct inode *dir, struct dentry *dentry, 2801 struct ext4_filename *fname); 2802 2803 void ext4_fname_free_filename(struct ext4_filename *fname); 2804 2805 int ext4_ioctl_get_encryption_pwsalt(struct file *filp, void __user *arg); 2806 2807 #else /* !CONFIG_FS_ENCRYPTION */ 2808 static inline int ext4_fname_setup_filename(struct inode *dir, 2809 const struct qstr *iname, 2810 int lookup, 2811 struct ext4_filename *fname) 2812 { 2813 fname->usr_fname = iname; 2814 fname->disk_name.name = (unsigned char *) iname->name; 2815 fname->disk_name.len = iname->len; 2816 2817 return ext4_fname_setup_ci_filename(dir, iname, fname); 2818 } 2819 2820 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2821 struct dentry *dentry, 2822 struct ext4_filename *fname) 2823 { 2824 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname); 2825 } 2826 2827 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2828 { 2829 ext4_fname_free_ci_filename(fname); 2830 } 2831 2832 static inline int ext4_ioctl_get_encryption_pwsalt(struct file *filp, 2833 void __user *arg) 2834 { 2835 return -EOPNOTSUPP; 2836 } 2837 #endif /* !CONFIG_FS_ENCRYPTION */ 2838 2839 /* dir.c */ 2840 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2841 struct file *, 2842 struct ext4_dir_entry_2 *, 2843 struct buffer_head *, char *, int, 2844 unsigned int); 2845 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2846 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2847 (de), (bh), (buf), (size), (offset))) 2848 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2849 __u32 minor_hash, 2850 struct ext4_dir_entry_2 *dirent, 2851 struct fscrypt_str *ent_name); 2852 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2853 extern int ext4_find_dest_de(struct inode *dir, struct buffer_head *bh, 2854 void *buf, int buf_size, 2855 struct ext4_filename *fname, 2856 struct ext4_dir_entry_2 **dest_de); 2857 void ext4_insert_dentry(struct inode *dir, struct inode *inode, 2858 struct ext4_dir_entry_2 *de, 2859 int buf_size, 2860 struct ext4_filename *fname); 2861 static inline void ext4_update_dx_flag(struct inode *inode) 2862 { 2863 if (!ext4_has_feature_dir_index(inode->i_sb) && 2864 ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) { 2865 /* ext4_iget() should have caught this... */ 2866 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb)); 2867 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2868 } 2869 } 2870 static const unsigned char ext4_filetype_table[] = { 2871 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2872 }; 2873 2874 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2875 { 2876 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2877 return DT_UNKNOWN; 2878 2879 return ext4_filetype_table[filetype]; 2880 } 2881 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2882 void *buf, int buf_size); 2883 2884 /* fsync.c */ 2885 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2886 2887 /* hash.c */ 2888 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len, 2889 struct dx_hash_info *hinfo); 2890 2891 /* ialloc.c */ 2892 extern int ext4_mark_inode_used(struct super_block *sb, int ino); 2893 extern struct inode *__ext4_new_inode(struct mnt_idmap *, handle_t *, 2894 struct inode *, umode_t, 2895 const struct qstr *qstr, __u32 goal, 2896 uid_t *owner, __u32 i_flags, 2897 int handle_type, unsigned int line_no, 2898 int nblocks); 2899 2900 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \ 2901 __ext4_new_inode(&nop_mnt_idmap, (handle), (dir), (mode), (qstr), \ 2902 (goal), (owner), i_flags, 0, 0, 0) 2903 #define ext4_new_inode_start_handle(idmap, dir, mode, qstr, goal, owner, \ 2904 type, nblocks) \ 2905 __ext4_new_inode((idmap), NULL, (dir), (mode), (qstr), (goal), (owner), \ 2906 0, (type), __LINE__, (nblocks)) 2907 2908 2909 extern void ext4_free_inode(handle_t *, struct inode *); 2910 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2911 extern unsigned long ext4_count_free_inodes(struct super_block *); 2912 extern unsigned long ext4_count_dirs(struct super_block *); 2913 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2914 extern int ext4_init_inode_table(struct super_block *sb, 2915 ext4_group_t group, int barrier); 2916 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2917 2918 /* fast_commit.c */ 2919 int ext4_fc_info_show(struct seq_file *seq, void *v); 2920 void ext4_fc_init(struct super_block *sb, journal_t *journal); 2921 void ext4_fc_init_inode(struct inode *inode); 2922 void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start, 2923 ext4_lblk_t end); 2924 void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode, 2925 struct dentry *dentry); 2926 void __ext4_fc_track_link(handle_t *handle, struct inode *inode, 2927 struct dentry *dentry); 2928 void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry); 2929 void ext4_fc_track_link(handle_t *handle, struct dentry *dentry); 2930 void __ext4_fc_track_create(handle_t *handle, struct inode *inode, 2931 struct dentry *dentry); 2932 void ext4_fc_track_create(handle_t *handle, struct dentry *dentry); 2933 void ext4_fc_track_inode(handle_t *handle, struct inode *inode); 2934 void ext4_fc_mark_ineligible(struct super_block *sb, int reason, handle_t *handle); 2935 void ext4_fc_del(struct inode *inode); 2936 bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block); 2937 void ext4_fc_replay_cleanup(struct super_block *sb); 2938 int ext4_fc_commit(journal_t *journal, tid_t commit_tid); 2939 int __init ext4_fc_init_dentry_cache(void); 2940 void ext4_fc_destroy_dentry_cache(void); 2941 int ext4_fc_record_regions(struct super_block *sb, int ino, 2942 ext4_lblk_t lblk, ext4_fsblk_t pblk, 2943 int len, int replay); 2944 2945 /* mballoc.c */ 2946 extern const struct seq_operations ext4_mb_seq_groups_ops; 2947 extern const struct seq_operations ext4_mb_seq_structs_summary_ops; 2948 extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset); 2949 extern int ext4_mb_init(struct super_block *); 2950 extern void ext4_mb_release(struct super_block *); 2951 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2952 struct ext4_allocation_request *, int *); 2953 extern void ext4_discard_preallocations(struct inode *); 2954 extern int __init ext4_init_mballoc(void); 2955 extern void ext4_exit_mballoc(void); 2956 extern ext4_group_t ext4_mb_prefetch(struct super_block *sb, 2957 ext4_group_t group, 2958 unsigned int nr, int *cnt); 2959 extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group, 2960 unsigned int nr); 2961 2962 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2963 struct buffer_head *bh, ext4_fsblk_t block, 2964 unsigned long count, int flags); 2965 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2966 ext4_group_t ngroups); 2967 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2968 ext4_group_t i, struct ext4_group_desc *desc); 2969 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2970 ext4_fsblk_t block, unsigned long count); 2971 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2972 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid); 2973 extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block, 2974 int len, bool state); 2975 static inline bool ext4_mb_cr_expensive(enum criteria cr) 2976 { 2977 return cr >= CR_GOAL_LEN_SLOW; 2978 } 2979 2980 /* inode.c */ 2981 void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw, 2982 struct ext4_inode_info *ei); 2983 int ext4_inode_is_fast_symlink(struct inode *inode); 2984 void ext4_check_map_extents_env(struct inode *inode); 2985 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2986 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2987 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count, 2988 bool wait, struct buffer_head **bhs); 2989 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2990 struct buffer_head *bh_result, int create); 2991 int ext4_get_block(struct inode *inode, sector_t iblock, 2992 struct buffer_head *bh_result, int create); 2993 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2994 struct buffer_head *bh, int create); 2995 int ext4_walk_page_buffers(handle_t *handle, 2996 struct inode *inode, 2997 struct buffer_head *head, 2998 unsigned from, 2999 unsigned to, 3000 int *partial, 3001 int (*fn)(handle_t *handle, struct inode *inode, 3002 struct buffer_head *bh)); 3003 int do_journal_get_write_access(handle_t *handle, struct inode *inode, 3004 struct buffer_head *bh); 3005 void ext4_set_inode_mapping_order(struct inode *inode); 3006 #define FALL_BACK_TO_NONDELALLOC 1 3007 #define CONVERT_INLINE_DATA 2 3008 3009 typedef enum { 3010 EXT4_IGET_NORMAL = 0, 3011 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */ 3012 EXT4_IGET_HANDLE = 0x0002, /* Inode # is from a handle */ 3013 EXT4_IGET_BAD = 0x0004, /* Allow to iget a bad inode */ 3014 EXT4_IGET_EA_INODE = 0x0008 /* Inode should contain an EA value */ 3015 } ext4_iget_flags; 3016 3017 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, 3018 ext4_iget_flags flags, const char *function, 3019 unsigned int line); 3020 3021 #define ext4_iget(sb, ino, flags) \ 3022 __ext4_iget((sb), (ino), (flags), __func__, __LINE__) 3023 3024 extern int ext4_write_inode(struct inode *, struct writeback_control *); 3025 extern int ext4_setattr(struct mnt_idmap *, struct dentry *, 3026 struct iattr *); 3027 extern u32 ext4_dio_alignment(struct inode *inode); 3028 extern int ext4_getattr(struct mnt_idmap *, const struct path *, 3029 struct kstat *, u32, unsigned int); 3030 extern void ext4_evict_inode(struct inode *); 3031 extern void ext4_clear_inode(struct inode *); 3032 extern int ext4_file_getattr(struct mnt_idmap *, const struct path *, 3033 struct kstat *, u32, unsigned int); 3034 extern void ext4_dirty_inode(struct inode *, int); 3035 extern int ext4_change_inode_journal_flag(struct inode *, int); 3036 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 3037 extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino, 3038 struct ext4_iloc *iloc); 3039 extern int ext4_inode_attach_jinode(struct inode *inode); 3040 extern int ext4_can_truncate(struct inode *inode); 3041 extern int ext4_truncate(struct inode *); 3042 extern int ext4_break_layouts(struct inode *); 3043 extern int ext4_truncate_page_cache_block_range(struct inode *inode, 3044 loff_t start, loff_t end); 3045 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length); 3046 extern void ext4_set_inode_flags(struct inode *, bool init); 3047 extern int ext4_alloc_da_blocks(struct inode *inode); 3048 extern void ext4_set_aops(struct inode *inode); 3049 extern int ext4_normal_submit_inode_data_buffers(struct jbd2_inode *jinode); 3050 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 3051 extern int ext4_chunk_trans_extent(struct inode *inode, int nrblocks); 3052 extern int ext4_meta_trans_blocks(struct inode *inode, int lblocks, 3053 int pextents); 3054 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 3055 loff_t lstart, loff_t lend); 3056 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf); 3057 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 3058 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 3059 extern void ext4_da_release_space(struct inode *inode, int to_free); 3060 extern void ext4_da_update_reserve_space(struct inode *inode, 3061 int used, int quota_claim); 3062 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 3063 ext4_fsblk_t pblk, ext4_lblk_t len); 3064 3065 static inline bool is_special_ino(struct super_block *sb, unsigned long ino) 3066 { 3067 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 3068 3069 return (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) || 3070 ino == le32_to_cpu(es->s_usr_quota_inum) || 3071 ino == le32_to_cpu(es->s_grp_quota_inum) || 3072 ino == le32_to_cpu(es->s_prj_quota_inum) || 3073 ino == le32_to_cpu(es->s_orphan_file_inum); 3074 } 3075 3076 /* indirect.c */ 3077 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 3078 struct ext4_map_blocks *map, int flags); 3079 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 3080 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 3081 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 3082 ext4_lblk_t start, ext4_lblk_t end); 3083 3084 /* ioctl.c */ 3085 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 3086 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 3087 int ext4_fileattr_set(struct mnt_idmap *idmap, 3088 struct dentry *dentry, struct file_kattr *fa); 3089 int ext4_fileattr_get(struct dentry *dentry, struct file_kattr *fa); 3090 extern void ext4_reset_inode_seed(struct inode *inode); 3091 int ext4_update_overhead(struct super_block *sb, bool force); 3092 int ext4_force_shutdown(struct super_block *sb, u32 flags); 3093 3094 /* migrate.c */ 3095 extern int ext4_ext_migrate(struct inode *); 3096 extern int ext4_ind_migrate(struct inode *inode); 3097 3098 /* namei.c */ 3099 extern int ext4_init_new_dir(handle_t *handle, struct inode *dir, 3100 struct inode *inode); 3101 extern int ext4_dirblock_csum_verify(struct inode *inode, 3102 struct buffer_head *bh); 3103 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 3104 __u32 start_minor_hash, __u32 *next_hash); 3105 extern int ext4_search_dir(struct buffer_head *bh, 3106 char *search_buf, 3107 int buf_size, 3108 struct inode *dir, 3109 struct ext4_filename *fname, 3110 unsigned int offset, 3111 struct ext4_dir_entry_2 **res_dir); 3112 extern int ext4_generic_delete_entry(struct inode *dir, 3113 struct ext4_dir_entry_2 *de_del, 3114 struct buffer_head *bh, 3115 void *entry_buf, 3116 int buf_size, 3117 int csum_size); 3118 extern bool ext4_empty_dir(struct inode *inode); 3119 3120 /* resize.c */ 3121 extern void ext4_kvfree_array_rcu(void *to_free); 3122 extern int ext4_group_add(struct super_block *sb, 3123 struct ext4_new_group_data *input); 3124 extern int ext4_group_extend(struct super_block *sb, 3125 struct ext4_super_block *es, 3126 ext4_fsblk_t n_blocks_count); 3127 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 3128 extern unsigned int ext4_list_backups(struct super_block *sb, 3129 unsigned int *three, unsigned int *five, 3130 unsigned int *seven); 3131 3132 /* super.c */ 3133 extern struct buffer_head *ext4_sb_bread(struct super_block *sb, 3134 sector_t block, blk_opf_t op_flags); 3135 extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb, 3136 sector_t block); 3137 extern void ext4_read_bh_nowait(struct buffer_head *bh, blk_opf_t op_flags, 3138 bh_end_io_t *end_io, bool simu_fail); 3139 extern int ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags, 3140 bh_end_io_t *end_io, bool simu_fail); 3141 extern int ext4_read_bh_lock(struct buffer_head *bh, blk_opf_t op_flags, bool wait); 3142 extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block); 3143 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 3144 extern int ext4_calculate_overhead(struct super_block *sb); 3145 extern __le32 ext4_superblock_csum(struct ext4_super_block *es); 3146 extern void ext4_superblock_csum_set(struct super_block *sb); 3147 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 3148 ext4_group_t ngroup); 3149 extern const char *ext4_decode_error(struct super_block *sb, int errno, 3150 char nbuf[16]); 3151 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb, 3152 ext4_group_t block_group, 3153 unsigned int flags); 3154 extern unsigned int ext4_num_base_meta_blocks(struct super_block *sb, 3155 ext4_group_t block_group); 3156 3157 extern __printf(7, 8) 3158 void __ext4_error(struct super_block *, const char *, unsigned int, bool, 3159 int, __u64, const char *, ...); 3160 extern __printf(6, 7) 3161 void __ext4_error_inode(struct inode *, const char *, unsigned int, 3162 ext4_fsblk_t, int, const char *, ...); 3163 extern __printf(5, 6) 3164 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 3165 const char *, ...); 3166 extern void __ext4_std_error(struct super_block *, const char *, 3167 unsigned int, int); 3168 extern __printf(4, 5) 3169 void __ext4_warning(struct super_block *, const char *, unsigned int, 3170 const char *, ...); 3171 extern __printf(4, 5) 3172 void __ext4_warning_inode(const struct inode *inode, const char *function, 3173 unsigned int line, const char *fmt, ...); 3174 extern __printf(3, 4) 3175 void __ext4_msg(struct super_block *, const char *, const char *, ...); 3176 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 3177 const char *, unsigned int, const char *); 3178 extern __printf(7, 8) 3179 void __ext4_grp_locked_error(const char *, unsigned int, 3180 struct super_block *, ext4_group_t, 3181 unsigned long, ext4_fsblk_t, 3182 const char *, ...); 3183 3184 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 3185 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 3186 3187 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \ 3188 __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a) 3189 3190 #define ext4_error_inode_block(inode, block, err, fmt, a...) \ 3191 __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \ 3192 (fmt), ## a) 3193 3194 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 3195 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 3196 3197 #define ext4_abort(sb, err, fmt, a...) \ 3198 __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a) 3199 3200 #ifdef CONFIG_PRINTK 3201 3202 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 3203 __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__) 3204 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 3205 __ext4_error_inode((inode), (func), (line), (block), \ 3206 (err), (fmt), ##__VA_ARGS__) 3207 #define ext4_error_file(file, func, line, block, fmt, ...) \ 3208 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 3209 #define ext4_error(sb, fmt, ...) \ 3210 __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt), \ 3211 ##__VA_ARGS__) 3212 #define ext4_error_err(sb, err, fmt, ...) \ 3213 __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt), \ 3214 ##__VA_ARGS__) 3215 #define ext4_warning(sb, fmt, ...) \ 3216 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 3217 #define ext4_warning_inode(inode, fmt, ...) \ 3218 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 3219 #define ext4_msg(sb, level, fmt, ...) \ 3220 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 3221 #define dump_mmp_msg(sb, mmp, msg) \ 3222 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 3223 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 3224 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 3225 fmt, ##__VA_ARGS__) 3226 3227 #else 3228 3229 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 3230 do { \ 3231 no_printk(fmt, ##__VA_ARGS__); \ 3232 __ext4_error_inode(inode, "", 0, block, 0, " "); \ 3233 } while (0) 3234 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 3235 do { \ 3236 no_printk(fmt, ##__VA_ARGS__); \ 3237 __ext4_error_inode(inode, "", 0, block, err, " "); \ 3238 } while (0) 3239 #define ext4_error_file(file, func, line, block, fmt, ...) \ 3240 do { \ 3241 no_printk(fmt, ##__VA_ARGS__); \ 3242 __ext4_error_file(file, "", 0, block, " "); \ 3243 } while (0) 3244 #define ext4_error(sb, fmt, ...) \ 3245 do { \ 3246 no_printk(fmt, ##__VA_ARGS__); \ 3247 __ext4_error(sb, "", 0, false, 0, 0, " "); \ 3248 } while (0) 3249 #define ext4_error_err(sb, err, fmt, ...) \ 3250 do { \ 3251 no_printk(fmt, ##__VA_ARGS__); \ 3252 __ext4_error(sb, "", 0, false, err, 0, " "); \ 3253 } while (0) 3254 #define ext4_warning(sb, fmt, ...) \ 3255 do { \ 3256 no_printk(fmt, ##__VA_ARGS__); \ 3257 __ext4_warning(sb, "", 0, " "); \ 3258 } while (0) 3259 #define ext4_warning_inode(inode, fmt, ...) \ 3260 do { \ 3261 no_printk(fmt, ##__VA_ARGS__); \ 3262 __ext4_warning_inode(inode, "", 0, " "); \ 3263 } while (0) 3264 #define ext4_msg(sb, level, fmt, ...) \ 3265 do { \ 3266 no_printk(fmt, ##__VA_ARGS__); \ 3267 __ext4_msg(sb, "", " "); \ 3268 } while (0) 3269 #define dump_mmp_msg(sb, mmp, msg) \ 3270 __dump_mmp_msg(sb, mmp, "", 0, "") 3271 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 3272 do { \ 3273 no_printk(fmt, ##__VA_ARGS__); \ 3274 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 3275 } while (0) 3276 3277 #endif 3278 3279 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 3280 struct ext4_group_desc *bg); 3281 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 3282 struct ext4_group_desc *bg); 3283 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 3284 struct ext4_group_desc *bg); 3285 extern __u32 ext4_free_group_clusters(struct super_block *sb, 3286 struct ext4_group_desc *bg); 3287 extern __u32 ext4_free_inodes_count(struct super_block *sb, 3288 struct ext4_group_desc *bg); 3289 extern __u32 ext4_used_dirs_count(struct super_block *sb, 3290 struct ext4_group_desc *bg); 3291 extern __u32 ext4_itable_unused_count(struct super_block *sb, 3292 struct ext4_group_desc *bg); 3293 extern void ext4_block_bitmap_set(struct super_block *sb, 3294 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3295 extern void ext4_inode_bitmap_set(struct super_block *sb, 3296 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3297 extern void ext4_inode_table_set(struct super_block *sb, 3298 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3299 extern void ext4_free_group_clusters_set(struct super_block *sb, 3300 struct ext4_group_desc *bg, 3301 __u32 count); 3302 extern void ext4_free_inodes_set(struct super_block *sb, 3303 struct ext4_group_desc *bg, __u32 count); 3304 extern void ext4_used_dirs_set(struct super_block *sb, 3305 struct ext4_group_desc *bg, __u32 count); 3306 extern void ext4_itable_unused_set(struct super_block *sb, 3307 struct ext4_group_desc *bg, __u32 count); 3308 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 3309 struct ext4_group_desc *gdp); 3310 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 3311 struct ext4_group_desc *gdp); 3312 extern int ext4_register_li_request(struct super_block *sb, 3313 ext4_group_t first_not_zeroed); 3314 3315 static inline int ext4_has_group_desc_csum(struct super_block *sb) 3316 { 3317 return ext4_has_feature_gdt_csum(sb) || 3318 ext4_has_feature_metadata_csum(sb); 3319 } 3320 3321 #define ext4_read_incompat_64bit_val(es, name) \ 3322 (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \ 3323 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \ 3324 le32_to_cpu(es->name##_lo)) 3325 3326 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 3327 { 3328 return ext4_read_incompat_64bit_val(es, s_blocks_count); 3329 } 3330 3331 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 3332 { 3333 return ext4_read_incompat_64bit_val(es, s_r_blocks_count); 3334 } 3335 3336 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 3337 { 3338 return ext4_read_incompat_64bit_val(es, s_free_blocks_count); 3339 } 3340 3341 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 3342 ext4_fsblk_t blk) 3343 { 3344 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 3345 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 3346 } 3347 3348 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 3349 ext4_fsblk_t blk) 3350 { 3351 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 3352 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 3353 } 3354 3355 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 3356 ext4_fsblk_t blk) 3357 { 3358 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 3359 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 3360 } 3361 3362 static inline loff_t ext4_isize(struct super_block *sb, 3363 struct ext4_inode *raw_inode) 3364 { 3365 if (ext4_has_feature_largedir(sb) || 3366 S_ISREG(le16_to_cpu(raw_inode->i_mode))) 3367 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 3368 le32_to_cpu(raw_inode->i_size_lo); 3369 3370 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 3371 } 3372 3373 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 3374 { 3375 raw_inode->i_size_lo = cpu_to_le32(i_size); 3376 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 3377 } 3378 3379 /* 3380 * Reading s_groups_count requires using smp_rmb() afterwards. See 3381 * the locking protocol documented in the comments of ext4_group_add() 3382 * in resize.c 3383 */ 3384 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 3385 { 3386 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 3387 3388 smp_rmb(); 3389 return ngroups; 3390 } 3391 3392 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 3393 ext4_group_t block_group) 3394 { 3395 return block_group >> sbi->s_log_groups_per_flex; 3396 } 3397 3398 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 3399 { 3400 return 1 << sbi->s_log_groups_per_flex; 3401 } 3402 3403 static inline loff_t ext4_get_maxbytes(struct inode *inode) 3404 { 3405 if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) 3406 return inode->i_sb->s_maxbytes; 3407 return EXT4_SB(inode->i_sb)->s_bitmap_maxbytes; 3408 } 3409 3410 #define ext4_std_error(sb, errno) \ 3411 do { \ 3412 if ((errno)) \ 3413 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 3414 } while (0) 3415 3416 #ifdef CONFIG_SMP 3417 /* Each CPU can accumulate percpu_counter_batch clusters in their local 3418 * counters. So we need to make sure we have free clusters more 3419 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 3420 */ 3421 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 3422 #else 3423 #define EXT4_FREECLUSTERS_WATERMARK 0 3424 #endif 3425 3426 /* Update i_disksize. Requires i_rwsem to avoid races with truncate */ 3427 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 3428 { 3429 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 3430 !inode_is_locked(inode)); 3431 down_write(&EXT4_I(inode)->i_data_sem); 3432 if (newsize > EXT4_I(inode)->i_disksize) 3433 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize); 3434 up_write(&EXT4_I(inode)->i_data_sem); 3435 } 3436 3437 /* Update i_size, i_disksize. Requires i_rwsem to avoid races with truncate */ 3438 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 3439 { 3440 int changed = 0; 3441 3442 if (newsize > inode->i_size) { 3443 i_size_write(inode, newsize); 3444 changed = 1; 3445 } 3446 if (newsize > EXT4_I(inode)->i_disksize) { 3447 ext4_update_i_disksize(inode, newsize); 3448 changed |= 2; 3449 } 3450 return changed; 3451 } 3452 3453 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 3454 loff_t len); 3455 3456 struct ext4_group_info { 3457 unsigned long bb_state; 3458 #ifdef AGGRESSIVE_CHECK 3459 unsigned long bb_check_counter; 3460 #endif 3461 struct rb_root bb_free_root; 3462 ext4_grpblk_t bb_first_free; /* first free block */ 3463 ext4_grpblk_t bb_free; /* total free blocks */ 3464 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 3465 int bb_avg_fragment_size_order; /* order of average 3466 fragment in BG */ 3467 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 3468 ext4_group_t bb_group; /* Group number */ 3469 struct list_head bb_prealloc_list; 3470 #ifdef DOUBLE_CHECK 3471 void *bb_bitmap; 3472 #endif 3473 struct rw_semaphore alloc_sem; 3474 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 3475 * regions, index is order. 3476 * bb_counters[3] = 5 means 3477 * 5 free 8-block regions. */ 3478 }; 3479 3480 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 3481 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 3482 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 3483 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 3484 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \ 3485 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT) 3486 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \ 3487 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT) 3488 #define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4 3489 3490 #define EXT4_MB_GRP_NEED_INIT(grp) \ 3491 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 3492 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 3493 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3494 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 3495 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3496 3497 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 3498 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3499 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 3500 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3501 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 3502 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3503 #define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \ 3504 (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state))) 3505 3506 #define EXT4_MAX_CONTENTION 8 3507 #define EXT4_CONTENTION_THRESHOLD 2 3508 3509 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 3510 ext4_group_t group) 3511 { 3512 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 3513 } 3514 3515 /* 3516 * Returns true if the filesystem is busy enough that attempts to 3517 * access the block group locks has run into contention. 3518 */ 3519 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 3520 { 3521 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 3522 } 3523 3524 static inline bool ext4_try_lock_group(struct super_block *sb, ext4_group_t group) 3525 { 3526 if (!spin_trylock(ext4_group_lock_ptr(sb, group))) 3527 return false; 3528 /* 3529 * We're able to grab the lock right away, so drop the lock 3530 * contention counter. 3531 */ 3532 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 3533 return true; 3534 } 3535 3536 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 3537 { 3538 if (!ext4_try_lock_group(sb, group)) { 3539 /* 3540 * The lock is busy, so bump the contention counter, 3541 * and then wait on the spin lock. 3542 */ 3543 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 3544 EXT4_MAX_CONTENTION); 3545 spin_lock(ext4_group_lock_ptr(sb, group)); 3546 } 3547 } 3548 3549 static inline void ext4_unlock_group(struct super_block *sb, 3550 ext4_group_t group) 3551 { 3552 spin_unlock(ext4_group_lock_ptr(sb, group)); 3553 } 3554 3555 #ifdef CONFIG_QUOTA 3556 static inline bool ext4_quota_capable(struct super_block *sb) 3557 { 3558 return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb)); 3559 } 3560 3561 static inline bool ext4_is_quota_journalled(struct super_block *sb) 3562 { 3563 struct ext4_sb_info *sbi = EXT4_SB(sb); 3564 3565 return (ext4_has_feature_quota(sb) || 3566 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]); 3567 } 3568 int ext4_enable_quotas(struct super_block *sb); 3569 #endif 3570 3571 /* 3572 * Block validity checking 3573 */ 3574 #define ext4_check_indirect_blockref(inode, bh) \ 3575 ext4_check_blockref(__func__, __LINE__, inode, \ 3576 (__le32 *)(bh)->b_data, \ 3577 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 3578 3579 #define ext4_ind_check_inode(inode) \ 3580 ext4_check_blockref(__func__, __LINE__, inode, \ 3581 EXT4_I(inode)->i_data, \ 3582 EXT4_NDIR_BLOCKS) 3583 3584 /* 3585 * Inodes and files operations 3586 */ 3587 3588 /* dir.c */ 3589 extern const struct file_operations ext4_dir_operations; 3590 3591 /* file.c */ 3592 extern const struct inode_operations ext4_file_inode_operations; 3593 extern const struct file_operations ext4_file_operations; 3594 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 3595 3596 /* inline.c */ 3597 extern int ext4_get_max_inline_size(struct inode *inode); 3598 extern int ext4_find_inline_data_nolock(struct inode *inode); 3599 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 3600 extern void ext4_update_final_de(void *de_buf, int old_size, int new_size); 3601 3602 int ext4_readpage_inline(struct inode *inode, struct folio *folio); 3603 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 3604 struct inode *inode, 3605 loff_t pos, unsigned len, 3606 struct folio **foliop); 3607 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len, 3608 unsigned copied, struct folio *folio); 3609 extern int ext4_generic_write_inline_data(struct address_space *mapping, 3610 struct inode *inode, 3611 loff_t pos, unsigned len, 3612 struct folio **foliop, 3613 void **fsdata, bool da); 3614 extern int ext4_try_add_inline_entry(handle_t *handle, 3615 struct ext4_filename *fname, 3616 struct inode *dir, struct inode *inode); 3617 extern int ext4_try_create_inline_dir(handle_t *handle, 3618 struct inode *parent, 3619 struct inode *inode); 3620 extern int ext4_read_inline_dir(struct file *filp, 3621 struct dir_context *ctx, 3622 int *has_inline_data); 3623 extern int ext4_inlinedir_to_tree(struct file *dir_file, 3624 struct inode *dir, ext4_lblk_t block, 3625 struct dx_hash_info *hinfo, 3626 __u32 start_hash, __u32 start_minor_hash, 3627 int *has_inline_data); 3628 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3629 struct ext4_filename *fname, 3630 struct ext4_dir_entry_2 **res_dir, 3631 int *has_inline_data); 3632 extern int ext4_delete_inline_entry(handle_t *handle, 3633 struct inode *dir, 3634 struct ext4_dir_entry_2 *de_del, 3635 struct buffer_head *bh, 3636 int *has_inline_data); 3637 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); 3638 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3639 struct ext4_dir_entry_2 **parent_de, 3640 int *retval); 3641 extern void *ext4_read_inline_link(struct inode *inode); 3642 3643 struct iomap; 3644 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap); 3645 3646 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3647 3648 extern int ext4_convert_inline_data(struct inode *inode); 3649 3650 static inline int ext4_has_inline_data(struct inode *inode) 3651 { 3652 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3653 EXT4_I(inode)->i_inline_off; 3654 } 3655 3656 /* namei.c */ 3657 extern const struct inode_operations ext4_dir_inode_operations; 3658 extern const struct inode_operations ext4_special_inode_operations; 3659 extern struct dentry *ext4_get_parent(struct dentry *child); 3660 extern int ext4_init_dirblock(handle_t *handle, struct inode *inode, 3661 struct buffer_head *dir_block, 3662 unsigned int parent_ino, void *inline_buf, 3663 int inline_size); 3664 extern void ext4_initialize_dirent_tail(struct buffer_head *bh, 3665 unsigned int blocksize); 3666 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode, 3667 struct buffer_head *bh); 3668 extern int __ext4_unlink(struct inode *dir, const struct qstr *d_name, 3669 struct inode *inode, struct dentry *dentry); 3670 extern int __ext4_link(struct inode *dir, struct inode *inode, 3671 struct dentry *dentry); 3672 3673 #define S_SHIFT 12 3674 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = { 3675 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3676 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3677 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3678 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3679 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3680 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3681 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3682 }; 3683 3684 static inline void ext4_set_de_type(struct super_block *sb, 3685 struct ext4_dir_entry_2 *de, 3686 umode_t mode) { 3687 if (ext4_has_feature_filetype(sb)) 3688 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3689 } 3690 3691 /* readpages.c */ 3692 extern int ext4_mpage_readpages(struct inode *inode, 3693 struct readahead_control *rac, struct folio *folio); 3694 extern int __init ext4_init_post_read_processing(void); 3695 extern void ext4_exit_post_read_processing(void); 3696 3697 /* symlink.c */ 3698 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3699 extern const struct inode_operations ext4_symlink_inode_operations; 3700 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3701 3702 /* sysfs.c */ 3703 extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi); 3704 extern int ext4_register_sysfs(struct super_block *sb); 3705 extern void ext4_unregister_sysfs(struct super_block *sb); 3706 extern int __init ext4_init_sysfs(void); 3707 extern void ext4_exit_sysfs(void); 3708 3709 /* block_validity */ 3710 extern void ext4_release_system_zone(struct super_block *sb); 3711 extern int ext4_setup_system_zone(struct super_block *sb); 3712 extern int __init ext4_init_system_zone(void); 3713 extern void ext4_exit_system_zone(void); 3714 extern int ext4_inode_block_valid(struct inode *inode, 3715 ext4_fsblk_t start_blk, 3716 unsigned int count); 3717 extern int ext4_check_blockref(const char *, unsigned int, 3718 struct inode *, __le32 *, unsigned int); 3719 extern int ext4_sb_block_valid(struct super_block *sb, struct inode *inode, 3720 ext4_fsblk_t start_blk, unsigned int count); 3721 3722 3723 /* extents.c */ 3724 struct ext4_ext_path; 3725 struct ext4_extent; 3726 3727 /* 3728 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3729 * __le32. 3730 */ 3731 #define EXT_MAX_BLOCKS 0xffffffff 3732 3733 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode); 3734 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3735 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3736 struct ext4_map_blocks *map, int flags); 3737 extern int ext4_ext_truncate(handle_t *, struct inode *); 3738 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3739 ext4_lblk_t end); 3740 extern void ext4_ext_init(struct super_block *); 3741 extern void ext4_ext_release(struct super_block *); 3742 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3743 loff_t len); 3744 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3745 loff_t offset, ssize_t len); 3746 extern int ext4_convert_unwritten_extents_atomic(handle_t *handle, 3747 struct inode *inode, loff_t offset, ssize_t len); 3748 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle, 3749 ext4_io_end_t *io_end); 3750 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3751 struct ext4_map_blocks *map, int flags); 3752 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3753 int num, 3754 struct ext4_ext_path *path); 3755 extern struct ext4_ext_path *ext4_ext_insert_extent( 3756 handle_t *handle, struct inode *inode, 3757 struct ext4_ext_path *path, 3758 struct ext4_extent *newext, int gb_flags); 3759 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3760 struct ext4_ext_path *, 3761 int flags); 3762 extern void ext4_free_ext_path(struct ext4_ext_path *); 3763 extern int ext4_ext_check_inode(struct inode *inode); 3764 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3765 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3766 __u64 start, __u64 len); 3767 extern int ext4_get_es_cache(struct inode *inode, 3768 struct fiemap_extent_info *fieinfo, 3769 __u64 start, __u64 len); 3770 extern int ext4_ext_precache(struct inode *inode); 3771 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3772 struct inode *inode2, ext4_lblk_t lblk1, 3773 ext4_lblk_t lblk2, ext4_lblk_t count, 3774 int mark_unwritten,int *err); 3775 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu); 3776 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode, 3777 int check_cred, int restart_cred, 3778 int revoke_cred); 3779 extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end); 3780 extern int ext4_ext_replay_set_iblocks(struct inode *inode); 3781 extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start, 3782 int len, int unwritten, ext4_fsblk_t pblk); 3783 extern int ext4_ext_clear_bb(struct inode *inode); 3784 3785 3786 /* move_extent.c */ 3787 extern void ext4_double_down_write_data_sem(struct inode *first, 3788 struct inode *second); 3789 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3790 struct inode *donor_inode); 3791 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3792 __u64 start_orig, __u64 start_donor, 3793 __u64 len, __u64 *moved_len); 3794 3795 /* page-io.c */ 3796 extern int __init ext4_init_pageio(void); 3797 extern void ext4_exit_pageio(void); 3798 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3799 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3800 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3801 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3802 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3803 struct writeback_control *wbc); 3804 extern void ext4_end_io_rsv_work(struct work_struct *work); 3805 extern void ext4_io_submit(struct ext4_io_submit *io); 3806 int ext4_bio_write_folio(struct ext4_io_submit *io, struct folio *page, 3807 size_t len); 3808 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end); 3809 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end); 3810 3811 /* mmp.c */ 3812 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3813 3814 /* mmp.c */ 3815 extern void ext4_stop_mmpd(struct ext4_sb_info *sbi); 3816 3817 /* verity.c */ 3818 extern const struct fsverity_operations ext4_verityops; 3819 3820 /* orphan.c */ 3821 extern int ext4_orphan_add(handle_t *, struct inode *); 3822 extern int ext4_orphan_del(handle_t *, struct inode *); 3823 extern void ext4_orphan_cleanup(struct super_block *sb, 3824 struct ext4_super_block *es); 3825 extern void ext4_release_orphan_info(struct super_block *sb); 3826 extern int ext4_init_orphan_info(struct super_block *sb); 3827 extern int ext4_orphan_file_empty(struct super_block *sb); 3828 extern void ext4_orphan_file_block_trigger( 3829 struct jbd2_buffer_trigger_type *triggers, 3830 struct buffer_head *bh, 3831 void *data, size_t size); 3832 3833 /* 3834 * Add new method to test whether block and inode bitmaps are properly 3835 * initialized. With uninit_bg reading the block from disk is not enough 3836 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3837 */ 3838 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3839 3840 static inline int bitmap_uptodate(struct buffer_head *bh) 3841 { 3842 return (buffer_uptodate(bh) && 3843 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3844 } 3845 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3846 { 3847 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3848 } 3849 3850 extern int ext4_resize_begin(struct super_block *sb); 3851 extern int ext4_resize_end(struct super_block *sb, bool update_backups); 3852 3853 static inline void ext4_set_io_unwritten_flag(struct ext4_io_end *io_end) 3854 { 3855 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) 3856 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3857 } 3858 3859 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3860 { 3861 if (io_end->flag & EXT4_IO_END_UNWRITTEN) 3862 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3863 } 3864 3865 extern const struct iomap_ops ext4_iomap_ops; 3866 extern const struct iomap_ops ext4_iomap_overwrite_ops; 3867 extern const struct iomap_ops ext4_iomap_report_ops; 3868 3869 static inline int ext4_buffer_uptodate(struct buffer_head *bh) 3870 { 3871 /* 3872 * If the buffer has the write error flag, we have failed 3873 * to write out data in the block. In this case, we don't 3874 * have to read the block because we may read the old data 3875 * successfully. 3876 */ 3877 if (buffer_write_io_error(bh)) 3878 set_buffer_uptodate(bh); 3879 return buffer_uptodate(bh); 3880 } 3881 3882 static inline bool ext4_inode_can_atomic_write(struct inode *inode) 3883 { 3884 3885 return S_ISREG(inode->i_mode) && 3886 ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) && 3887 EXT4_SB(inode->i_sb)->s_awu_min > 0; 3888 } 3889 3890 extern int ext4_block_write_begin(handle_t *handle, struct folio *folio, 3891 loff_t pos, unsigned len, 3892 get_block_t *get_block); 3893 #endif /* __KERNEL__ */ 3894 3895 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3896 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3897 3898 #endif /* _EXT4_H */ 3899