1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * ext4.h 4 * 5 * Copyright (C) 1992, 1993, 1994, 1995 6 * Remy Card (card@masi.ibp.fr) 7 * Laboratoire MASI - Institut Blaise Pascal 8 * Universite Pierre et Marie Curie (Paris VI) 9 * 10 * from 11 * 12 * linux/include/linux/minix_fs.h 13 * 14 * Copyright (C) 1991, 1992 Linus Torvalds 15 */ 16 17 #ifndef _EXT4_H 18 #define _EXT4_H 19 20 #include <linux/types.h> 21 #include <linux/blkdev.h> 22 #include <linux/magic.h> 23 #include <linux/jbd2.h> 24 #include <linux/quota.h> 25 #include <linux/rwsem.h> 26 #include <linux/rbtree.h> 27 #include <linux/seqlock.h> 28 #include <linux/mutex.h> 29 #include <linux/timer.h> 30 #include <linux/wait.h> 31 #include <linux/sched/signal.h> 32 #include <linux/blockgroup_lock.h> 33 #include <linux/percpu_counter.h> 34 #include <linux/ratelimit.h> 35 #include <crypto/hash.h> 36 #include <linux/falloc.h> 37 #include <linux/percpu-rwsem.h> 38 #include <linux/fiemap.h> 39 #ifdef __KERNEL__ 40 #include <linux/compat.h> 41 #endif 42 43 #include <linux/fscrypt.h> 44 #include <linux/fsverity.h> 45 46 #include <linux/compiler.h> 47 48 /* 49 * The fourth extended filesystem constants/structures 50 */ 51 52 /* 53 * with AGGRESSIVE_CHECK allocator runs consistency checks over 54 * structures. these checks slow things down a lot 55 */ 56 #define AGGRESSIVE_CHECK__ 57 58 /* 59 * with DOUBLE_CHECK defined mballoc creates persistent in-core 60 * bitmaps, maintains and uses them to check for double allocations 61 */ 62 #define DOUBLE_CHECK__ 63 64 /* 65 * Define EXT4FS_DEBUG to produce debug messages 66 */ 67 #undef EXT4FS_DEBUG 68 69 /* 70 * Debug code 71 */ 72 #ifdef EXT4FS_DEBUG 73 #define ext4_debug(f, a...) \ 74 do { \ 75 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 76 __FILE__, __LINE__, __func__); \ 77 printk(KERN_DEBUG f, ## a); \ 78 } while (0) 79 #else 80 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 81 #endif 82 83 /* 84 * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c 85 */ 86 #define EXT_DEBUG__ 87 88 /* 89 * Dynamic printk for controlled extents debugging. 90 */ 91 #ifdef CONFIG_EXT4_DEBUG 92 #define ext_debug(ino, fmt, ...) \ 93 pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt, \ 94 current->comm, task_pid_nr(current), \ 95 ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__, \ 96 __func__, ##__VA_ARGS__) 97 #else 98 #define ext_debug(ino, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 99 #endif 100 101 #define ASSERT(assert) \ 102 do { \ 103 if (unlikely(!(assert))) { \ 104 printk(KERN_EMERG \ 105 "Assertion failure in %s() at %s:%d: '%s'\n", \ 106 __func__, __FILE__, __LINE__, #assert); \ 107 BUG(); \ 108 } \ 109 } while (0) 110 111 /* data type for block offset of block group */ 112 typedef int ext4_grpblk_t; 113 114 /* data type for filesystem-wide blocks number */ 115 typedef unsigned long long ext4_fsblk_t; 116 117 /* data type for file logical block number */ 118 typedef __u32 ext4_lblk_t; 119 120 /* data type for block group number */ 121 typedef unsigned int ext4_group_t; 122 123 enum SHIFT_DIRECTION { 124 SHIFT_LEFT = 0, 125 SHIFT_RIGHT, 126 }; 127 128 /* 129 * Flags used in mballoc's allocation_context flags field. 130 * 131 * Also used to show what's going on for debugging purposes when the 132 * flag field is exported via the traceport interface 133 */ 134 135 /* prefer goal again. length */ 136 #define EXT4_MB_HINT_MERGE 0x0001 137 /* blocks already reserved */ 138 #define EXT4_MB_HINT_RESERVED 0x0002 139 /* metadata is being allocated */ 140 #define EXT4_MB_HINT_METADATA 0x0004 141 /* first blocks in the file */ 142 #define EXT4_MB_HINT_FIRST 0x0008 143 /* search for the best chunk */ 144 #define EXT4_MB_HINT_BEST 0x0010 145 /* data is being allocated */ 146 #define EXT4_MB_HINT_DATA 0x0020 147 /* don't preallocate (for tails) */ 148 #define EXT4_MB_HINT_NOPREALLOC 0x0040 149 /* allocate for locality group */ 150 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 151 /* allocate goal blocks or none */ 152 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 153 /* goal is meaningful */ 154 #define EXT4_MB_HINT_TRY_GOAL 0x0200 155 /* blocks already pre-reserved by delayed allocation */ 156 #define EXT4_MB_DELALLOC_RESERVED 0x0400 157 /* We are doing stream allocation */ 158 #define EXT4_MB_STREAM_ALLOC 0x0800 159 /* Use reserved root blocks if needed */ 160 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 161 /* Use blocks from reserved pool */ 162 #define EXT4_MB_USE_RESERVED 0x2000 163 /* Do strict check for free blocks while retrying block allocation */ 164 #define EXT4_MB_STRICT_CHECK 0x4000 165 166 struct ext4_allocation_request { 167 /* target inode for block we're allocating */ 168 struct inode *inode; 169 /* how many blocks we want to allocate */ 170 unsigned int len; 171 /* logical block in target inode */ 172 ext4_lblk_t logical; 173 /* the closest logical allocated block to the left */ 174 ext4_lblk_t lleft; 175 /* the closest logical allocated block to the right */ 176 ext4_lblk_t lright; 177 /* phys. target (a hint) */ 178 ext4_fsblk_t goal; 179 /* phys. block for the closest logical allocated block to the left */ 180 ext4_fsblk_t pleft; 181 /* phys. block for the closest logical allocated block to the right */ 182 ext4_fsblk_t pright; 183 /* flags. see above EXT4_MB_HINT_* */ 184 unsigned int flags; 185 }; 186 187 /* 188 * Logical to physical block mapping, used by ext4_map_blocks() 189 * 190 * This structure is used to pass requests into ext4_map_blocks() as 191 * well as to store the information returned by ext4_map_blocks(). It 192 * takes less room on the stack than a struct buffer_head. 193 */ 194 #define EXT4_MAP_NEW BIT(BH_New) 195 #define EXT4_MAP_MAPPED BIT(BH_Mapped) 196 #define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten) 197 #define EXT4_MAP_BOUNDARY BIT(BH_Boundary) 198 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 199 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 200 201 struct ext4_map_blocks { 202 ext4_fsblk_t m_pblk; 203 ext4_lblk_t m_lblk; 204 unsigned int m_len; 205 unsigned int m_flags; 206 }; 207 208 /* 209 * Block validity checking, system zone rbtree. 210 */ 211 struct ext4_system_blocks { 212 struct rb_root root; 213 struct rcu_head rcu; 214 }; 215 216 /* 217 * Flags for ext4_io_end->flags 218 */ 219 #define EXT4_IO_END_UNWRITTEN 0x0001 220 221 struct ext4_io_end_vec { 222 struct list_head list; /* list of io_end_vec */ 223 loff_t offset; /* offset in the file */ 224 ssize_t size; /* size of the extent */ 225 }; 226 227 /* 228 * For converting unwritten extents on a work queue. 'handle' is used for 229 * buffered writeback. 230 */ 231 typedef struct ext4_io_end { 232 struct list_head list; /* per-file finished IO list */ 233 handle_t *handle; /* handle reserved for extent 234 * conversion */ 235 struct inode *inode; /* file being written to */ 236 struct bio *bio; /* Linked list of completed 237 * bios covering the extent */ 238 unsigned int flag; /* unwritten or not */ 239 atomic_t count; /* reference counter */ 240 struct list_head list_vec; /* list of ext4_io_end_vec */ 241 } ext4_io_end_t; 242 243 struct ext4_io_submit { 244 struct writeback_control *io_wbc; 245 struct bio *io_bio; 246 ext4_io_end_t *io_end; 247 sector_t io_next_block; 248 }; 249 250 /* 251 * Special inodes numbers 252 */ 253 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 254 #define EXT4_ROOT_INO 2 /* Root inode */ 255 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 256 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 257 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 258 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 259 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 260 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 261 262 /* First non-reserved inode for old ext4 filesystems */ 263 #define EXT4_GOOD_OLD_FIRST_INO 11 264 265 /* 266 * Maximal count of links to a file 267 */ 268 #define EXT4_LINK_MAX 65000 269 270 /* 271 * Macro-instructions used to manage several block sizes 272 */ 273 #define EXT4_MIN_BLOCK_SIZE 1024 274 #define EXT4_MAX_BLOCK_SIZE 65536 275 #define EXT4_MIN_BLOCK_LOG_SIZE 10 276 #define EXT4_MAX_BLOCK_LOG_SIZE 16 277 #define EXT4_MAX_CLUSTER_LOG_SIZE 30 278 #ifdef __KERNEL__ 279 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 280 #else 281 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 282 #endif 283 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 284 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 285 EXT4_SB(s)->s_cluster_bits) 286 #ifdef __KERNEL__ 287 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 288 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 289 #else 290 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 291 #endif 292 #ifdef __KERNEL__ 293 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 294 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 295 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 296 #else 297 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 298 EXT4_GOOD_OLD_INODE_SIZE : \ 299 (s)->s_inode_size) 300 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 301 EXT4_GOOD_OLD_FIRST_INO : \ 302 (s)->s_first_ino) 303 #endif 304 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 305 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \ 306 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \ 307 blkbits)) 308 309 /* Translate a block number to a cluster number */ 310 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 311 /* Translate a cluster number to a block number */ 312 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 313 /* Translate # of blks to # of clusters */ 314 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 315 (sbi)->s_cluster_bits) 316 /* Mask out the low bits to get the starting block of the cluster */ 317 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 318 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 319 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 320 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 321 /* Fill in the low bits to get the last block of the cluster */ 322 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \ 323 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1)) 324 /* Get the cluster offset */ 325 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 326 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 327 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 328 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 329 330 /* 331 * Structure of a blocks group descriptor 332 */ 333 struct ext4_group_desc 334 { 335 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 336 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 337 __le32 bg_inode_table_lo; /* Inodes table block */ 338 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 339 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 340 __le16 bg_used_dirs_count_lo; /* Directories count */ 341 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 342 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 343 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 344 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 345 __le16 bg_itable_unused_lo; /* Unused inodes count */ 346 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 347 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 348 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 349 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 350 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 351 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 352 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 353 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 354 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 355 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 356 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 357 __u32 bg_reserved; 358 }; 359 360 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 361 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 362 sizeof(__le16)) 363 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 364 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 365 sizeof(__le16)) 366 367 /* 368 * Structure of a flex block group info 369 */ 370 371 struct flex_groups { 372 atomic64_t free_clusters; 373 atomic_t free_inodes; 374 atomic_t used_dirs; 375 }; 376 377 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 378 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 379 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 380 381 /* 382 * Macro-instructions used to manage group descriptors 383 */ 384 #define EXT4_MIN_DESC_SIZE 32 385 #define EXT4_MIN_DESC_SIZE_64BIT 64 386 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 387 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 388 #ifdef __KERNEL__ 389 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 390 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 391 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 392 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 393 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 394 #else 395 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 396 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 397 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 398 #endif 399 400 /* 401 * Constants relative to the data blocks 402 */ 403 #define EXT4_NDIR_BLOCKS 12 404 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 405 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 406 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 407 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 408 409 /* 410 * Inode flags 411 */ 412 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 413 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 414 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 415 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 416 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 417 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 418 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 419 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 420 /* Reserved for compression usage... */ 421 #define EXT4_DIRTY_FL 0x00000100 422 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 423 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 424 /* nb: was previously EXT2_ECOMPR_FL */ 425 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 426 /* End compression flags --- maybe not all used */ 427 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 428 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 429 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 430 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 431 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 432 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 433 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 434 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 435 #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */ 436 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 437 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */ 438 439 #define EXT4_DAX_FL 0x02000000 /* Inode is DAX */ 440 441 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 442 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 443 #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */ 444 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 445 446 /* User modifiable flags */ 447 #define EXT4_FL_USER_MODIFIABLE (EXT4_SECRM_FL | \ 448 EXT4_UNRM_FL | \ 449 EXT4_COMPR_FL | \ 450 EXT4_SYNC_FL | \ 451 EXT4_IMMUTABLE_FL | \ 452 EXT4_APPEND_FL | \ 453 EXT4_NODUMP_FL | \ 454 EXT4_NOATIME_FL | \ 455 EXT4_JOURNAL_DATA_FL | \ 456 EXT4_NOTAIL_FL | \ 457 EXT4_DIRSYNC_FL | \ 458 EXT4_TOPDIR_FL | \ 459 EXT4_EXTENTS_FL | \ 460 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \ 461 EXT4_DAX_FL | \ 462 EXT4_PROJINHERIT_FL | \ 463 EXT4_CASEFOLD_FL) 464 465 /* User visible flags */ 466 #define EXT4_FL_USER_VISIBLE (EXT4_FL_USER_MODIFIABLE | \ 467 EXT4_DIRTY_FL | \ 468 EXT4_COMPRBLK_FL | \ 469 EXT4_NOCOMPR_FL | \ 470 EXT4_ENCRYPT_FL | \ 471 EXT4_INDEX_FL | \ 472 EXT4_VERITY_FL | \ 473 EXT4_INLINE_DATA_FL) 474 475 /* Flags we can manipulate with through FS_IOC_FSSETXATTR */ 476 #define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \ 477 EXT4_IMMUTABLE_FL | \ 478 EXT4_APPEND_FL | \ 479 EXT4_NODUMP_FL | \ 480 EXT4_NOATIME_FL | \ 481 EXT4_PROJINHERIT_FL | \ 482 EXT4_DAX_FL) 483 484 /* Flags that should be inherited by new inodes from their parent. */ 485 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 486 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 487 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 488 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 489 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\ 490 EXT4_DAX_FL) 491 492 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 493 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\ 494 EXT4_PROJINHERIT_FL)) 495 496 /* Flags that are appropriate for non-directories/regular files. */ 497 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 498 499 /* The only flags that should be swapped */ 500 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL) 501 502 /* Flags which are mutually exclusive to DAX */ 503 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\ 504 EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL) 505 506 /* Mask out flags that are inappropriate for the given type of inode. */ 507 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 508 { 509 if (S_ISDIR(mode)) 510 return flags; 511 else if (S_ISREG(mode)) 512 return flags & EXT4_REG_FLMASK; 513 else 514 return flags & EXT4_OTHER_FLMASK; 515 } 516 517 /* 518 * Inode flags used for atomic set/get 519 */ 520 enum { 521 EXT4_INODE_SECRM = 0, /* Secure deletion */ 522 EXT4_INODE_UNRM = 1, /* Undelete */ 523 EXT4_INODE_COMPR = 2, /* Compress file */ 524 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 525 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 526 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 527 EXT4_INODE_NODUMP = 6, /* do not dump file */ 528 EXT4_INODE_NOATIME = 7, /* do not update atime */ 529 /* Reserved for compression usage... */ 530 EXT4_INODE_DIRTY = 8, 531 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 532 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 533 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 534 /* End compression flags --- maybe not all used */ 535 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 536 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 537 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 538 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 539 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 540 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 541 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 542 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 543 EXT4_INODE_VERITY = 20, /* Verity protected inode */ 544 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 545 /* 22 was formerly EXT4_INODE_EOFBLOCKS */ 546 EXT4_INODE_DAX = 25, /* Inode is DAX */ 547 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 548 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 549 EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */ 550 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 551 }; 552 553 /* 554 * Since it's pretty easy to mix up bit numbers and hex values, we use a 555 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 556 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 557 * any extra space in the compiled kernel image, otherwise, the build will fail. 558 * It's important that these values are the same, since we are using 559 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 560 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 561 * values found in ext2, ext3 and ext4 filesystems, and of course the values 562 * defined in e2fsprogs. 563 * 564 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 565 */ 566 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 567 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 568 569 static inline void ext4_check_flag_values(void) 570 { 571 CHECK_FLAG_VALUE(SECRM); 572 CHECK_FLAG_VALUE(UNRM); 573 CHECK_FLAG_VALUE(COMPR); 574 CHECK_FLAG_VALUE(SYNC); 575 CHECK_FLAG_VALUE(IMMUTABLE); 576 CHECK_FLAG_VALUE(APPEND); 577 CHECK_FLAG_VALUE(NODUMP); 578 CHECK_FLAG_VALUE(NOATIME); 579 CHECK_FLAG_VALUE(DIRTY); 580 CHECK_FLAG_VALUE(COMPRBLK); 581 CHECK_FLAG_VALUE(NOCOMPR); 582 CHECK_FLAG_VALUE(ENCRYPT); 583 CHECK_FLAG_VALUE(INDEX); 584 CHECK_FLAG_VALUE(IMAGIC); 585 CHECK_FLAG_VALUE(JOURNAL_DATA); 586 CHECK_FLAG_VALUE(NOTAIL); 587 CHECK_FLAG_VALUE(DIRSYNC); 588 CHECK_FLAG_VALUE(TOPDIR); 589 CHECK_FLAG_VALUE(HUGE_FILE); 590 CHECK_FLAG_VALUE(EXTENTS); 591 CHECK_FLAG_VALUE(VERITY); 592 CHECK_FLAG_VALUE(EA_INODE); 593 CHECK_FLAG_VALUE(INLINE_DATA); 594 CHECK_FLAG_VALUE(PROJINHERIT); 595 CHECK_FLAG_VALUE(CASEFOLD); 596 CHECK_FLAG_VALUE(RESERVED); 597 } 598 599 /* Used to pass group descriptor data when online resize is done */ 600 struct ext4_new_group_input { 601 __u32 group; /* Group number for this data */ 602 __u64 block_bitmap; /* Absolute block number of block bitmap */ 603 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 604 __u64 inode_table; /* Absolute block number of inode table start */ 605 __u32 blocks_count; /* Total number of blocks in this group */ 606 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 607 __u16 unused; 608 }; 609 610 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 611 struct compat_ext4_new_group_input { 612 u32 group; 613 compat_u64 block_bitmap; 614 compat_u64 inode_bitmap; 615 compat_u64 inode_table; 616 u32 blocks_count; 617 u16 reserved_blocks; 618 u16 unused; 619 }; 620 #endif 621 622 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 623 struct ext4_new_group_data { 624 __u32 group; 625 __u64 block_bitmap; 626 __u64 inode_bitmap; 627 __u64 inode_table; 628 __u32 blocks_count; 629 __u16 reserved_blocks; 630 __u16 mdata_blocks; 631 __u32 free_clusters_count; 632 }; 633 634 /* Indexes used to index group tables in ext4_new_group_data */ 635 enum { 636 BLOCK_BITMAP = 0, /* block bitmap */ 637 INODE_BITMAP, /* inode bitmap */ 638 INODE_TABLE, /* inode tables */ 639 GROUP_TABLE_COUNT, 640 }; 641 642 /* 643 * Flags used by ext4_map_blocks() 644 */ 645 /* Allocate any needed blocks and/or convert an unwritten 646 extent to be an initialized ext4 */ 647 #define EXT4_GET_BLOCKS_CREATE 0x0001 648 /* Request the creation of an unwritten extent */ 649 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 650 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 651 EXT4_GET_BLOCKS_CREATE) 652 /* Caller is from the delayed allocation writeout path 653 * finally doing the actual allocation of delayed blocks */ 654 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 655 /* caller is from the direct IO path, request to creation of an 656 unwritten extents if not allocated, split the unwritten 657 extent if blocks has been preallocated already*/ 658 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 659 #define EXT4_GET_BLOCKS_CONVERT 0x0010 660 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 661 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 662 /* Convert extent to initialized after IO complete */ 663 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 664 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 665 /* Eventual metadata allocation (due to growing extent tree) 666 * should not fail, so try to use reserved blocks for that.*/ 667 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 668 /* Don't normalize allocation size (used for fallocate) */ 669 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 670 /* Convert written extents to unwritten */ 671 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 672 /* Write zeros to newly created written extents */ 673 #define EXT4_GET_BLOCKS_ZERO 0x0200 674 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 675 EXT4_GET_BLOCKS_ZERO) 676 /* Caller will submit data before dropping transaction handle. This 677 * allows jbd2 to avoid submitting data before commit. */ 678 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 679 680 /* 681 * The bit position of these flags must not overlap with any of the 682 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 683 * read_extent_tree_block(), ext4_split_extent_at(), 684 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 685 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 686 * caching the extents when reading from the extent tree while a 687 * truncate or punch hole operation is in progress. 688 */ 689 #define EXT4_EX_NOCACHE 0x40000000 690 #define EXT4_EX_FORCE_CACHE 0x20000000 691 #define EXT4_EX_NOFAIL 0x10000000 692 693 /* 694 * Flags used by ext4_free_blocks 695 */ 696 #define EXT4_FREE_BLOCKS_METADATA 0x0001 697 #define EXT4_FREE_BLOCKS_FORGET 0x0002 698 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 699 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 700 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 701 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 702 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040 703 704 /* 705 * ioctl commands 706 */ 707 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 708 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 709 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 710 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 711 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 712 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 713 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 714 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 715 #define EXT4_IOC_MIGRATE _IO('f', 9) 716 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 717 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 718 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 719 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 720 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 721 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 722 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 723 /* ioctl codes 19--39 are reserved for fscrypt */ 724 #define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40) 725 #define EXT4_IOC_GETSTATE _IOW('f', 41, __u32) 726 #define EXT4_IOC_GET_ES_CACHE _IOWR('f', 42, struct fiemap) 727 728 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32) 729 730 /* 731 * Flags for going down operation 732 */ 733 #define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */ 734 #define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */ 735 #define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */ 736 737 /* 738 * Flags returned by EXT4_IOC_GETSTATE 739 * 740 * We only expose to userspace a subset of the state flags in 741 * i_state_flags 742 */ 743 #define EXT4_STATE_FLAG_EXT_PRECACHED 0x00000001 744 #define EXT4_STATE_FLAG_NEW 0x00000002 745 #define EXT4_STATE_FLAG_NEWENTRY 0x00000004 746 #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE 0x00000008 747 748 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 749 /* 750 * ioctl commands in 32 bit emulation 751 */ 752 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 753 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 754 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 755 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 756 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 757 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 758 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 759 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 760 #endif 761 762 /* 763 * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag. 764 * It indicates that the entry in extent status cache is for a hole. 765 */ 766 #define EXT4_FIEMAP_EXTENT_HOLE 0x08000000 767 768 /* Max physical block we can address w/o extents */ 769 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 770 771 /* Max logical block we can support */ 772 #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE 773 774 /* 775 * Structure of an inode on the disk 776 */ 777 struct ext4_inode { 778 __le16 i_mode; /* File mode */ 779 __le16 i_uid; /* Low 16 bits of Owner Uid */ 780 __le32 i_size_lo; /* Size in bytes */ 781 __le32 i_atime; /* Access time */ 782 __le32 i_ctime; /* Inode Change time */ 783 __le32 i_mtime; /* Modification time */ 784 __le32 i_dtime; /* Deletion Time */ 785 __le16 i_gid; /* Low 16 bits of Group Id */ 786 __le16 i_links_count; /* Links count */ 787 __le32 i_blocks_lo; /* Blocks count */ 788 __le32 i_flags; /* File flags */ 789 union { 790 struct { 791 __le32 l_i_version; 792 } linux1; 793 struct { 794 __u32 h_i_translator; 795 } hurd1; 796 struct { 797 __u32 m_i_reserved1; 798 } masix1; 799 } osd1; /* OS dependent 1 */ 800 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 801 __le32 i_generation; /* File version (for NFS) */ 802 __le32 i_file_acl_lo; /* File ACL */ 803 __le32 i_size_high; 804 __le32 i_obso_faddr; /* Obsoleted fragment address */ 805 union { 806 struct { 807 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 808 __le16 l_i_file_acl_high; 809 __le16 l_i_uid_high; /* these 2 fields */ 810 __le16 l_i_gid_high; /* were reserved2[0] */ 811 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 812 __le16 l_i_reserved; 813 } linux2; 814 struct { 815 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 816 __u16 h_i_mode_high; 817 __u16 h_i_uid_high; 818 __u16 h_i_gid_high; 819 __u32 h_i_author; 820 } hurd2; 821 struct { 822 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 823 __le16 m_i_file_acl_high; 824 __u32 m_i_reserved2[2]; 825 } masix2; 826 } osd2; /* OS dependent 2 */ 827 __le16 i_extra_isize; 828 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 829 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 830 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 831 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 832 __le32 i_crtime; /* File Creation time */ 833 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 834 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 835 __le32 i_projid; /* Project ID */ 836 }; 837 838 struct move_extent { 839 __u32 reserved; /* should be zero */ 840 __u32 donor_fd; /* donor file descriptor */ 841 __u64 orig_start; /* logical start offset in block for orig */ 842 __u64 donor_start; /* logical start offset in block for donor */ 843 __u64 len; /* block length to be moved */ 844 __u64 moved_len; /* moved block length */ 845 }; 846 847 #define EXT4_EPOCH_BITS 2 848 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 849 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 850 851 /* 852 * Extended fields will fit into an inode if the filesystem was formatted 853 * with large inodes (-I 256 or larger) and there are not currently any EAs 854 * consuming all of the available space. For new inodes we always reserve 855 * enough space for the kernel's known extended fields, but for inodes 856 * created with an old kernel this might not have been the case. None of 857 * the extended inode fields is critical for correct filesystem operation. 858 * This macro checks if a certain field fits in the inode. Note that 859 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 860 */ 861 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 862 ((offsetof(typeof(*ext4_inode), field) + \ 863 sizeof((ext4_inode)->field)) \ 864 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 865 (einode)->i_extra_isize)) \ 866 867 /* 868 * We use an encoding that preserves the times for extra epoch "00": 869 * 870 * extra msb of adjust for signed 871 * epoch 32-bit 32-bit tv_sec to 872 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 873 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 874 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 875 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 876 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 877 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 878 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 879 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 880 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 881 * 882 * Note that previous versions of the kernel on 64-bit systems would 883 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 884 * 1970. e2fsck will correct this, assuming that it is run on the 885 * affected filesystem before 2242. 886 */ 887 888 static inline __le32 ext4_encode_extra_time(struct timespec64 *time) 889 { 890 u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK; 891 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); 892 } 893 894 static inline void ext4_decode_extra_time(struct timespec64 *time, 895 __le32 extra) 896 { 897 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) 898 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 899 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 900 } 901 902 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 903 do { \ 904 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\ 905 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 906 (raw_inode)->xtime ## _extra = \ 907 ext4_encode_extra_time(&(inode)->xtime); \ 908 } \ 909 else \ 910 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX)); \ 911 } while (0) 912 913 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 914 do { \ 915 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 916 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 917 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 918 (raw_inode)->xtime ## _extra = \ 919 ext4_encode_extra_time(&(einode)->xtime); \ 920 } while (0) 921 922 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 923 do { \ 924 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 925 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \ 926 ext4_decode_extra_time(&(inode)->xtime, \ 927 raw_inode->xtime ## _extra); \ 928 } \ 929 else \ 930 (inode)->xtime.tv_nsec = 0; \ 931 } while (0) 932 933 934 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 935 do { \ 936 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 937 (einode)->xtime.tv_sec = \ 938 (signed)le32_to_cpu((raw_inode)->xtime); \ 939 else \ 940 (einode)->xtime.tv_sec = 0; \ 941 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 942 ext4_decode_extra_time(&(einode)->xtime, \ 943 raw_inode->xtime ## _extra); \ 944 else \ 945 (einode)->xtime.tv_nsec = 0; \ 946 } while (0) 947 948 #define i_disk_version osd1.linux1.l_i_version 949 950 #if defined(__KERNEL__) || defined(__linux__) 951 #define i_reserved1 osd1.linux1.l_i_reserved1 952 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 953 #define i_blocks_high osd2.linux2.l_i_blocks_high 954 #define i_uid_low i_uid 955 #define i_gid_low i_gid 956 #define i_uid_high osd2.linux2.l_i_uid_high 957 #define i_gid_high osd2.linux2.l_i_gid_high 958 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 959 960 #elif defined(__GNU__) 961 962 #define i_translator osd1.hurd1.h_i_translator 963 #define i_uid_high osd2.hurd2.h_i_uid_high 964 #define i_gid_high osd2.hurd2.h_i_gid_high 965 #define i_author osd2.hurd2.h_i_author 966 967 #elif defined(__masix__) 968 969 #define i_reserved1 osd1.masix1.m_i_reserved1 970 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 971 #define i_reserved2 osd2.masix2.m_i_reserved2 972 973 #endif /* defined(__KERNEL__) || defined(__linux__) */ 974 975 #include "extents_status.h" 976 #include "fast_commit.h" 977 978 /* 979 * Lock subclasses for i_data_sem in the ext4_inode_info structure. 980 * 981 * These are needed to avoid lockdep false positives when we need to 982 * allocate blocks to the quota inode during ext4_map_blocks(), while 983 * holding i_data_sem for a normal (non-quota) inode. Since we don't 984 * do quota tracking for the quota inode, this avoids deadlock (as 985 * well as infinite recursion, since it isn't turtles all the way 986 * down...) 987 * 988 * I_DATA_SEM_NORMAL - Used for most inodes 989 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode 990 * where the second inode has larger inode number 991 * than the first 992 * I_DATA_SEM_QUOTA - Used for quota inodes only 993 */ 994 enum { 995 I_DATA_SEM_NORMAL = 0, 996 I_DATA_SEM_OTHER, 997 I_DATA_SEM_QUOTA, 998 }; 999 1000 1001 /* 1002 * fourth extended file system inode data in memory 1003 */ 1004 struct ext4_inode_info { 1005 __le32 i_data[15]; /* unconverted */ 1006 __u32 i_dtime; 1007 ext4_fsblk_t i_file_acl; 1008 1009 /* 1010 * i_block_group is the number of the block group which contains 1011 * this file's inode. Constant across the lifetime of the inode, 1012 * it is used for making block allocation decisions - we try to 1013 * place a file's data blocks near its inode block, and new inodes 1014 * near to their parent directory's inode. 1015 */ 1016 ext4_group_t i_block_group; 1017 ext4_lblk_t i_dir_start_lookup; 1018 #if (BITS_PER_LONG < 64) 1019 unsigned long i_state_flags; /* Dynamic state flags */ 1020 #endif 1021 unsigned long i_flags; 1022 1023 /* 1024 * Extended attributes can be read independently of the main file 1025 * data. Taking i_mutex even when reading would cause contention 1026 * between readers of EAs and writers of regular file data, so 1027 * instead we synchronize on xattr_sem when reading or changing 1028 * EAs. 1029 */ 1030 struct rw_semaphore xattr_sem; 1031 1032 struct list_head i_orphan; /* unlinked but open inodes */ 1033 1034 /* Fast commit related info */ 1035 1036 struct list_head i_fc_list; /* 1037 * inodes that need fast commit 1038 * protected by sbi->s_fc_lock. 1039 */ 1040 1041 /* Start of lblk range that needs to be committed in this fast commit */ 1042 ext4_lblk_t i_fc_lblk_start; 1043 1044 /* End of lblk range that needs to be committed in this fast commit */ 1045 ext4_lblk_t i_fc_lblk_len; 1046 1047 /* Number of ongoing updates on this inode */ 1048 atomic_t i_fc_updates; 1049 1050 /* Fast commit wait queue for this inode */ 1051 wait_queue_head_t i_fc_wait; 1052 1053 /* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */ 1054 struct mutex i_fc_lock; 1055 1056 /* 1057 * i_disksize keeps track of what the inode size is ON DISK, not 1058 * in memory. During truncate, i_size is set to the new size by 1059 * the VFS prior to calling ext4_truncate(), but the filesystem won't 1060 * set i_disksize to 0 until the truncate is actually under way. 1061 * 1062 * The intent is that i_disksize always represents the blocks which 1063 * are used by this file. This allows recovery to restart truncate 1064 * on orphans if we crash during truncate. We actually write i_disksize 1065 * into the on-disk inode when writing inodes out, instead of i_size. 1066 * 1067 * The only time when i_disksize and i_size may be different is when 1068 * a truncate is in progress. The only things which change i_disksize 1069 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 1070 */ 1071 loff_t i_disksize; 1072 1073 /* 1074 * i_data_sem is for serialising ext4_truncate() against 1075 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 1076 * data tree are chopped off during truncate. We can't do that in 1077 * ext4 because whenever we perform intermediate commits during 1078 * truncate, the inode and all the metadata blocks *must* be in a 1079 * consistent state which allows truncation of the orphans to restart 1080 * during recovery. Hence we must fix the get_block-vs-truncate race 1081 * by other means, so we have i_data_sem. 1082 */ 1083 struct rw_semaphore i_data_sem; 1084 /* 1085 * i_mmap_sem is for serializing page faults with truncate / punch hole 1086 * operations. We have to make sure that new page cannot be faulted in 1087 * a section of the inode that is being punched. We cannot easily use 1088 * i_data_sem for this since we need protection for the whole punch 1089 * operation and i_data_sem ranks below transaction start so we have 1090 * to occasionally drop it. 1091 */ 1092 struct rw_semaphore i_mmap_sem; 1093 struct inode vfs_inode; 1094 struct jbd2_inode *jinode; 1095 1096 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 1097 1098 /* 1099 * File creation time. Its function is same as that of 1100 * struct timespec64 i_{a,c,m}time in the generic inode. 1101 */ 1102 struct timespec64 i_crtime; 1103 1104 /* mballoc */ 1105 atomic_t i_prealloc_active; 1106 struct list_head i_prealloc_list; 1107 spinlock_t i_prealloc_lock; 1108 1109 /* extents status tree */ 1110 struct ext4_es_tree i_es_tree; 1111 rwlock_t i_es_lock; 1112 struct list_head i_es_list; 1113 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1114 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1115 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1116 extents to shrink. Protected by 1117 i_es_lock */ 1118 1119 /* ialloc */ 1120 ext4_group_t i_last_alloc_group; 1121 1122 /* allocation reservation info for delalloc */ 1123 /* In case of bigalloc, this refer to clusters rather than blocks */ 1124 unsigned int i_reserved_data_blocks; 1125 1126 /* pending cluster reservations for bigalloc file systems */ 1127 struct ext4_pending_tree i_pending_tree; 1128 1129 /* on-disk additional length */ 1130 __u16 i_extra_isize; 1131 1132 /* Indicate the inline data space. */ 1133 u16 i_inline_off; 1134 u16 i_inline_size; 1135 1136 #ifdef CONFIG_QUOTA 1137 /* quota space reservation, managed internally by quota code */ 1138 qsize_t i_reserved_quota; 1139 #endif 1140 1141 /* Lock protecting lists below */ 1142 spinlock_t i_completed_io_lock; 1143 /* 1144 * Completed IOs that need unwritten extents handling and have 1145 * transaction reserved 1146 */ 1147 struct list_head i_rsv_conversion_list; 1148 struct work_struct i_rsv_conversion_work; 1149 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 1150 1151 spinlock_t i_block_reservation_lock; 1152 1153 /* 1154 * Transactions that contain inode's metadata needed to complete 1155 * fsync and fdatasync, respectively. 1156 */ 1157 tid_t i_sync_tid; 1158 tid_t i_datasync_tid; 1159 1160 #ifdef CONFIG_QUOTA 1161 struct dquot *i_dquot[MAXQUOTAS]; 1162 #endif 1163 1164 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1165 __u32 i_csum_seed; 1166 1167 kprojid_t i_projid; 1168 }; 1169 1170 /* 1171 * File system states 1172 */ 1173 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1174 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1175 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1176 #define EXT4_FC_REPLAY 0x0020 /* Fast commit replay ongoing */ 1177 1178 /* 1179 * Misc. filesystem flags 1180 */ 1181 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1182 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1183 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1184 1185 /* 1186 * Mount flags set via mount options or defaults 1187 */ 1188 #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */ 1189 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1190 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1191 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1192 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1193 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1194 #define EXT4_MOUNT_ERRORS_MASK 0x00070 1195 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1196 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1197 #ifdef CONFIG_FS_DAX 1198 #define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */ 1199 #else 1200 #define EXT4_MOUNT_DAX_ALWAYS 0 1201 #endif 1202 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1203 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1204 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1205 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1206 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1207 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1208 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1209 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1210 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1211 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1212 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */ 1213 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota, 1214 * enable enforcement for hidden 1215 * quota files */ 1216 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable 1217 * enforcement for hidden quota 1218 * files */ 1219 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota 1220 * enforcement */ 1221 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1222 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1223 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1224 #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */ 1225 #define EXT4_MOUNT_PREFETCH_BLOCK_BITMAPS 0x4000000 1226 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1227 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1228 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1229 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1230 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1231 1232 /* 1233 * Mount flags set either automatically (could not be set by mount option) 1234 * based on per file system feature or property or in special cases such as 1235 * distinguishing between explicit mount option definition and default. 1236 */ 1237 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1238 specified delalloc */ 1239 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1240 size of blocksize * 8 1241 blocks */ 1242 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1243 file systems */ 1244 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1245 specified journal checksum */ 1246 1247 #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */ 1248 #define EXT4_MOUNT2_DAX_NEVER 0x00000020 /* Do not allow Direct Access */ 1249 #define EXT4_MOUNT2_DAX_INODE 0x00000040 /* For printing options only */ 1250 1251 1252 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1253 ~EXT4_MOUNT_##opt 1254 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1255 EXT4_MOUNT_##opt 1256 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1257 EXT4_MOUNT_##opt) 1258 1259 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1260 ~EXT4_MOUNT2_##opt 1261 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1262 EXT4_MOUNT2_##opt 1263 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1264 EXT4_MOUNT2_##opt) 1265 1266 #define ext4_test_and_set_bit __test_and_set_bit_le 1267 #define ext4_set_bit __set_bit_le 1268 #define ext4_set_bit_atomic ext2_set_bit_atomic 1269 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1270 #define ext4_clear_bit __clear_bit_le 1271 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1272 #define ext4_test_bit test_bit_le 1273 #define ext4_find_next_zero_bit find_next_zero_bit_le 1274 #define ext4_find_next_bit find_next_bit_le 1275 1276 extern void ext4_set_bits(void *bm, int cur, int len); 1277 1278 /* 1279 * Maximal mount counts between two filesystem checks 1280 */ 1281 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1282 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1283 1284 /* 1285 * Behaviour when detecting errors 1286 */ 1287 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1288 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1289 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1290 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1291 1292 /* Metadata checksum algorithm codes */ 1293 #define EXT4_CRC32C_CHKSUM 1 1294 1295 /* 1296 * Structure of the super block 1297 */ 1298 struct ext4_super_block { 1299 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1300 __le32 s_blocks_count_lo; /* Blocks count */ 1301 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1302 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1303 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1304 __le32 s_first_data_block; /* First Data Block */ 1305 __le32 s_log_block_size; /* Block size */ 1306 __le32 s_log_cluster_size; /* Allocation cluster size */ 1307 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1308 __le32 s_clusters_per_group; /* # Clusters per group */ 1309 __le32 s_inodes_per_group; /* # Inodes per group */ 1310 __le32 s_mtime; /* Mount time */ 1311 /*30*/ __le32 s_wtime; /* Write time */ 1312 __le16 s_mnt_count; /* Mount count */ 1313 __le16 s_max_mnt_count; /* Maximal mount count */ 1314 __le16 s_magic; /* Magic signature */ 1315 __le16 s_state; /* File system state */ 1316 __le16 s_errors; /* Behaviour when detecting errors */ 1317 __le16 s_minor_rev_level; /* minor revision level */ 1318 /*40*/ __le32 s_lastcheck; /* time of last check */ 1319 __le32 s_checkinterval; /* max. time between checks */ 1320 __le32 s_creator_os; /* OS */ 1321 __le32 s_rev_level; /* Revision level */ 1322 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1323 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1324 /* 1325 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1326 * 1327 * Note: the difference between the compatible feature set and 1328 * the incompatible feature set is that if there is a bit set 1329 * in the incompatible feature set that the kernel doesn't 1330 * know about, it should refuse to mount the filesystem. 1331 * 1332 * e2fsck's requirements are more strict; if it doesn't know 1333 * about a feature in either the compatible or incompatible 1334 * feature set, it must abort and not try to meddle with 1335 * things it doesn't understand... 1336 */ 1337 __le32 s_first_ino; /* First non-reserved inode */ 1338 __le16 s_inode_size; /* size of inode structure */ 1339 __le16 s_block_group_nr; /* block group # of this superblock */ 1340 __le32 s_feature_compat; /* compatible feature set */ 1341 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1342 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1343 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1344 /*78*/ char s_volume_name[16]; /* volume name */ 1345 /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */ 1346 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1347 /* 1348 * Performance hints. Directory preallocation should only 1349 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1350 */ 1351 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1352 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1353 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1354 /* 1355 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1356 */ 1357 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1358 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1359 __le32 s_journal_dev; /* device number of journal file */ 1360 __le32 s_last_orphan; /* start of list of inodes to delete */ 1361 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1362 __u8 s_def_hash_version; /* Default hash version to use */ 1363 __u8 s_jnl_backup_type; 1364 __le16 s_desc_size; /* size of group descriptor */ 1365 /*100*/ __le32 s_default_mount_opts; 1366 __le32 s_first_meta_bg; /* First metablock block group */ 1367 __le32 s_mkfs_time; /* When the filesystem was created */ 1368 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1369 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1370 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1371 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1372 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1373 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1374 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1375 __le32 s_flags; /* Miscellaneous flags */ 1376 __le16 s_raid_stride; /* RAID stride */ 1377 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1378 __le64 s_mmp_block; /* Block for multi-mount protection */ 1379 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1380 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1381 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1382 __u8 s_encryption_level; /* versioning level for encryption */ 1383 __u8 s_reserved_pad; /* Padding to next 32bits */ 1384 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1385 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1386 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1387 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1388 snapshot's future use */ 1389 __le32 s_snapshot_list; /* inode number of the head of the 1390 on-disk snapshot list */ 1391 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1392 __le32 s_error_count; /* number of fs errors */ 1393 __le32 s_first_error_time; /* first time an error happened */ 1394 __le32 s_first_error_ino; /* inode involved in first error */ 1395 __le64 s_first_error_block; /* block involved of first error */ 1396 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */ 1397 __le32 s_first_error_line; /* line number where error happened */ 1398 __le32 s_last_error_time; /* most recent time of an error */ 1399 __le32 s_last_error_ino; /* inode involved in last error */ 1400 __le32 s_last_error_line; /* line number where error happened */ 1401 __le64 s_last_error_block; /* block involved of last error */ 1402 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */ 1403 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1404 __u8 s_mount_opts[64]; 1405 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1406 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1407 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1408 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1409 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1410 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1411 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1412 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1413 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1414 __u8 s_wtime_hi; 1415 __u8 s_mtime_hi; 1416 __u8 s_mkfs_time_hi; 1417 __u8 s_lastcheck_hi; 1418 __u8 s_first_error_time_hi; 1419 __u8 s_last_error_time_hi; 1420 __u8 s_first_error_errcode; 1421 __u8 s_last_error_errcode; 1422 __le16 s_encoding; /* Filename charset encoding */ 1423 __le16 s_encoding_flags; /* Filename charset encoding flags */ 1424 __le32 s_reserved[95]; /* Padding to the end of the block */ 1425 __le32 s_checksum; /* crc32c(superblock) */ 1426 }; 1427 1428 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1429 1430 #ifdef __KERNEL__ 1431 1432 #ifdef CONFIG_FS_ENCRYPTION 1433 #define DUMMY_ENCRYPTION_ENABLED(sbi) ((sbi)->s_dummy_enc_policy.policy != NULL) 1434 #else 1435 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0) 1436 #endif 1437 1438 /* Number of quota types we support */ 1439 #define EXT4_MAXQUOTAS 3 1440 1441 #define EXT4_ENC_UTF8_12_1 1 1442 1443 /* 1444 * fourth extended-fs super-block data in memory 1445 */ 1446 struct ext4_sb_info { 1447 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1448 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1449 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1450 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1451 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1452 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1453 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1454 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1455 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1456 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1457 unsigned long s_overhead; /* # of fs overhead clusters */ 1458 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1459 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1460 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1461 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1462 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1463 struct buffer_head * __rcu *s_group_desc; 1464 unsigned int s_mount_opt; 1465 unsigned int s_mount_opt2; 1466 unsigned long s_mount_flags; 1467 unsigned int s_def_mount_opt; 1468 ext4_fsblk_t s_sb_block; 1469 atomic64_t s_resv_clusters; 1470 kuid_t s_resuid; 1471 kgid_t s_resgid; 1472 unsigned short s_mount_state; 1473 unsigned short s_pad; 1474 int s_addr_per_block_bits; 1475 int s_desc_per_block_bits; 1476 int s_inode_size; 1477 int s_first_ino; 1478 unsigned int s_inode_readahead_blks; 1479 unsigned int s_inode_goal; 1480 u32 s_hash_seed[4]; 1481 int s_def_hash_version; 1482 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1483 struct percpu_counter s_freeclusters_counter; 1484 struct percpu_counter s_freeinodes_counter; 1485 struct percpu_counter s_dirs_counter; 1486 struct percpu_counter s_dirtyclusters_counter; 1487 struct percpu_counter s_sra_exceeded_retry_limit; 1488 struct blockgroup_lock *s_blockgroup_lock; 1489 struct proc_dir_entry *s_proc; 1490 struct kobject s_kobj; 1491 struct completion s_kobj_unregister; 1492 struct super_block *s_sb; 1493 1494 /* Journaling */ 1495 struct journal_s *s_journal; 1496 struct list_head s_orphan; 1497 struct mutex s_orphan_lock; 1498 unsigned long s_ext4_flags; /* Ext4 superblock flags */ 1499 unsigned long s_commit_interval; 1500 u32 s_max_batch_time; 1501 u32 s_min_batch_time; 1502 struct block_device *s_journal_bdev; 1503 #ifdef CONFIG_QUOTA 1504 /* Names of quota files with journalled quota */ 1505 char __rcu *s_qf_names[EXT4_MAXQUOTAS]; 1506 int s_jquota_fmt; /* Format of quota to use */ 1507 #endif 1508 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1509 struct ext4_system_blocks __rcu *s_system_blks; 1510 1511 #ifdef EXTENTS_STATS 1512 /* ext4 extents stats */ 1513 unsigned long s_ext_min; 1514 unsigned long s_ext_max; 1515 unsigned long s_depth_max; 1516 spinlock_t s_ext_stats_lock; 1517 unsigned long s_ext_blocks; 1518 unsigned long s_ext_extents; 1519 #endif 1520 1521 /* for buddy allocator */ 1522 struct ext4_group_info ** __rcu *s_group_info; 1523 struct inode *s_buddy_cache; 1524 spinlock_t s_md_lock; 1525 unsigned short *s_mb_offsets; 1526 unsigned int *s_mb_maxs; 1527 unsigned int s_group_info_size; 1528 unsigned int s_mb_free_pending; 1529 struct list_head s_freed_data_list; /* List of blocks to be freed 1530 after commit completed */ 1531 1532 /* tunables */ 1533 unsigned long s_stripe; 1534 unsigned int s_mb_stream_request; 1535 unsigned int s_mb_max_to_scan; 1536 unsigned int s_mb_min_to_scan; 1537 unsigned int s_mb_stats; 1538 unsigned int s_mb_order2_reqs; 1539 unsigned int s_mb_group_prealloc; 1540 unsigned int s_mb_max_inode_prealloc; 1541 unsigned int s_max_dir_size_kb; 1542 /* where last allocation was done - for stream allocation */ 1543 unsigned long s_mb_last_group; 1544 unsigned long s_mb_last_start; 1545 unsigned int s_mb_prefetch; 1546 unsigned int s_mb_prefetch_limit; 1547 1548 /* stats for buddy allocator */ 1549 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1550 atomic_t s_bal_success; /* we found long enough chunks */ 1551 atomic_t s_bal_allocated; /* in blocks */ 1552 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1553 atomic_t s_bal_goals; /* goal hits */ 1554 atomic_t s_bal_breaks; /* too long searches */ 1555 atomic_t s_bal_2orders; /* 2^order hits */ 1556 spinlock_t s_bal_lock; 1557 unsigned long s_mb_buddies_generated; 1558 unsigned long long s_mb_generation_time; 1559 atomic_t s_mb_lost_chunks; 1560 atomic_t s_mb_preallocated; 1561 atomic_t s_mb_discarded; 1562 atomic_t s_lock_busy; 1563 1564 /* locality groups */ 1565 struct ext4_locality_group __percpu *s_locality_groups; 1566 1567 /* for write statistics */ 1568 unsigned long s_sectors_written_start; 1569 u64 s_kbytes_written; 1570 1571 /* the size of zero-out chunk */ 1572 unsigned int s_extent_max_zeroout_kb; 1573 1574 unsigned int s_log_groups_per_flex; 1575 struct flex_groups * __rcu *s_flex_groups; 1576 ext4_group_t s_flex_groups_allocated; 1577 1578 /* workqueue for reserved extent conversions (buffered io) */ 1579 struct workqueue_struct *rsv_conversion_wq; 1580 1581 /* timer for periodic error stats printing */ 1582 struct timer_list s_err_report; 1583 1584 /* Lazy inode table initialization info */ 1585 struct ext4_li_request *s_li_request; 1586 /* Wait multiplier for lazy initialization thread */ 1587 unsigned int s_li_wait_mult; 1588 1589 /* Kernel thread for multiple mount protection */ 1590 struct task_struct *s_mmp_tsk; 1591 1592 /* record the last minlen when FITRIM is called. */ 1593 atomic_t s_last_trim_minblks; 1594 1595 /* Reference to checksum algorithm driver via cryptoapi */ 1596 struct crypto_shash *s_chksum_driver; 1597 1598 /* Precomputed FS UUID checksum for seeding other checksums */ 1599 __u32 s_csum_seed; 1600 1601 /* Reclaim extents from extent status tree */ 1602 struct shrinker s_es_shrinker; 1603 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1604 long s_es_nr_inode; 1605 struct ext4_es_stats s_es_stats; 1606 struct mb_cache *s_ea_block_cache; 1607 struct mb_cache *s_ea_inode_cache; 1608 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1609 1610 /* Ratelimit ext4 messages. */ 1611 struct ratelimit_state s_err_ratelimit_state; 1612 struct ratelimit_state s_warning_ratelimit_state; 1613 struct ratelimit_state s_msg_ratelimit_state; 1614 atomic_t s_warning_count; 1615 atomic_t s_msg_count; 1616 1617 /* Encryption policy for '-o test_dummy_encryption' */ 1618 struct fscrypt_dummy_policy s_dummy_enc_policy; 1619 1620 /* 1621 * Barrier between writepages ops and changing any inode's JOURNAL_DATA 1622 * or EXTENTS flag. 1623 */ 1624 struct percpu_rw_semaphore s_writepages_rwsem; 1625 struct dax_device *s_daxdev; 1626 #ifdef CONFIG_EXT4_DEBUG 1627 unsigned long s_simulate_fail; 1628 #endif 1629 /* Record the errseq of the backing block device */ 1630 errseq_t s_bdev_wb_err; 1631 spinlock_t s_bdev_wb_lock; 1632 1633 /* Information about errors that happened during this mount */ 1634 spinlock_t s_error_lock; 1635 int s_add_error_count; 1636 int s_first_error_code; 1637 __u32 s_first_error_line; 1638 __u32 s_first_error_ino; 1639 __u64 s_first_error_block; 1640 const char *s_first_error_func; 1641 time64_t s_first_error_time; 1642 int s_last_error_code; 1643 __u32 s_last_error_line; 1644 __u32 s_last_error_ino; 1645 __u64 s_last_error_block; 1646 const char *s_last_error_func; 1647 time64_t s_last_error_time; 1648 /* 1649 * If we are in a context where we cannot update error information in 1650 * the on-disk superblock, we queue this work to do it. 1651 */ 1652 struct work_struct s_error_work; 1653 1654 /* Ext4 fast commit stuff */ 1655 atomic_t s_fc_subtid; 1656 atomic_t s_fc_ineligible_updates; 1657 /* 1658 * After commit starts, the main queue gets locked, and the further 1659 * updates get added in the staging queue. 1660 */ 1661 #define FC_Q_MAIN 0 1662 #define FC_Q_STAGING 1 1663 struct list_head s_fc_q[2]; /* Inodes staged for fast commit 1664 * that have data changes in them. 1665 */ 1666 struct list_head s_fc_dentry_q[2]; /* directory entry updates */ 1667 unsigned int s_fc_bytes; 1668 /* 1669 * Main fast commit lock. This lock protects accesses to the 1670 * following fields: 1671 * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh. 1672 */ 1673 spinlock_t s_fc_lock; 1674 struct buffer_head *s_fc_bh; 1675 struct ext4_fc_stats s_fc_stats; 1676 u64 s_fc_avg_commit_time; 1677 #ifdef CONFIG_EXT4_DEBUG 1678 int s_fc_debug_max_replay; 1679 #endif 1680 struct ext4_fc_replay_state s_fc_replay_state; 1681 }; 1682 1683 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1684 { 1685 return sb->s_fs_info; 1686 } 1687 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1688 { 1689 return container_of(inode, struct ext4_inode_info, vfs_inode); 1690 } 1691 1692 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1693 { 1694 return ino == EXT4_ROOT_INO || 1695 (ino >= EXT4_FIRST_INO(sb) && 1696 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1697 } 1698 1699 /* 1700 * Returns: sbi->field[index] 1701 * Used to access an array element from the following sbi fields which require 1702 * rcu protection to avoid dereferencing an invalid pointer due to reassignment 1703 * - s_group_desc 1704 * - s_group_info 1705 * - s_flex_group 1706 */ 1707 #define sbi_array_rcu_deref(sbi, field, index) \ 1708 ({ \ 1709 typeof(*((sbi)->field)) _v; \ 1710 rcu_read_lock(); \ 1711 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \ 1712 rcu_read_unlock(); \ 1713 _v; \ 1714 }) 1715 1716 /* 1717 * run-time mount flags 1718 */ 1719 enum { 1720 EXT4_MF_MNTDIR_SAMPLED, 1721 EXT4_MF_FS_ABORTED, /* Fatal error detected */ 1722 EXT4_MF_FC_INELIGIBLE, /* Fast commit ineligible */ 1723 EXT4_MF_FC_COMMITTING /* File system underoing a fast 1724 * commit. 1725 */ 1726 }; 1727 1728 static inline void ext4_set_mount_flag(struct super_block *sb, int bit) 1729 { 1730 set_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1731 } 1732 1733 static inline void ext4_clear_mount_flag(struct super_block *sb, int bit) 1734 { 1735 clear_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1736 } 1737 1738 static inline int ext4_test_mount_flag(struct super_block *sb, int bit) 1739 { 1740 return test_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1741 } 1742 1743 1744 /* 1745 * Simulate_fail codes 1746 */ 1747 #define EXT4_SIM_BBITMAP_EIO 1 1748 #define EXT4_SIM_BBITMAP_CRC 2 1749 #define EXT4_SIM_IBITMAP_EIO 3 1750 #define EXT4_SIM_IBITMAP_CRC 4 1751 #define EXT4_SIM_INODE_EIO 5 1752 #define EXT4_SIM_INODE_CRC 6 1753 #define EXT4_SIM_DIRBLOCK_EIO 7 1754 #define EXT4_SIM_DIRBLOCK_CRC 8 1755 1756 static inline bool ext4_simulate_fail(struct super_block *sb, 1757 unsigned long code) 1758 { 1759 #ifdef CONFIG_EXT4_DEBUG 1760 struct ext4_sb_info *sbi = EXT4_SB(sb); 1761 1762 if (unlikely(sbi->s_simulate_fail == code)) { 1763 sbi->s_simulate_fail = 0; 1764 return true; 1765 } 1766 #endif 1767 return false; 1768 } 1769 1770 static inline void ext4_simulate_fail_bh(struct super_block *sb, 1771 struct buffer_head *bh, 1772 unsigned long code) 1773 { 1774 if (!IS_ERR(bh) && ext4_simulate_fail(sb, code)) 1775 clear_buffer_uptodate(bh); 1776 } 1777 1778 /* 1779 * Error number codes for s_{first,last}_error_errno 1780 * 1781 * Linux errno numbers are architecture specific, so we need to translate 1782 * them into something which is architecture independent. We don't define 1783 * codes for all errno's; just the ones which are most likely to be the cause 1784 * of an ext4_error() call. 1785 */ 1786 #define EXT4_ERR_UNKNOWN 1 1787 #define EXT4_ERR_EIO 2 1788 #define EXT4_ERR_ENOMEM 3 1789 #define EXT4_ERR_EFSBADCRC 4 1790 #define EXT4_ERR_EFSCORRUPTED 5 1791 #define EXT4_ERR_ENOSPC 6 1792 #define EXT4_ERR_ENOKEY 7 1793 #define EXT4_ERR_EROFS 8 1794 #define EXT4_ERR_EFBIG 9 1795 #define EXT4_ERR_EEXIST 10 1796 #define EXT4_ERR_ERANGE 11 1797 #define EXT4_ERR_EOVERFLOW 12 1798 #define EXT4_ERR_EBUSY 13 1799 #define EXT4_ERR_ENOTDIR 14 1800 #define EXT4_ERR_ENOTEMPTY 15 1801 #define EXT4_ERR_ESHUTDOWN 16 1802 #define EXT4_ERR_EFAULT 17 1803 1804 /* 1805 * Inode dynamic state flags 1806 */ 1807 enum { 1808 EXT4_STATE_JDATA, /* journaled data exists */ 1809 EXT4_STATE_NEW, /* inode is newly created */ 1810 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1811 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1812 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1813 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1814 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1815 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1816 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1817 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */ 1818 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */ 1819 EXT4_STATE_FC_COMMITTING, /* Fast commit ongoing */ 1820 }; 1821 1822 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1823 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1824 { \ 1825 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1826 } \ 1827 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1828 { \ 1829 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1830 } \ 1831 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1832 { \ 1833 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1834 } 1835 1836 /* Add these declarations here only so that these functions can be 1837 * found by name. Otherwise, they are very hard to locate. */ 1838 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1839 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1840 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1841 EXT4_INODE_BIT_FNS(flag, flags, 0) 1842 1843 /* Add these declarations here only so that these functions can be 1844 * found by name. Otherwise, they are very hard to locate. */ 1845 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1846 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1847 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1848 #if (BITS_PER_LONG < 64) 1849 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1850 1851 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1852 { 1853 (ei)->i_state_flags = 0; 1854 } 1855 #else 1856 EXT4_INODE_BIT_FNS(state, flags, 32) 1857 1858 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1859 { 1860 /* We depend on the fact that callers will set i_flags */ 1861 } 1862 #endif 1863 #else 1864 /* Assume that user mode programs are passing in an ext4fs superblock, not 1865 * a kernel struct super_block. This will allow us to call the feature-test 1866 * macros from user land. */ 1867 #define EXT4_SB(sb) (sb) 1868 #endif 1869 1870 static inline bool ext4_verity_in_progress(struct inode *inode) 1871 { 1872 return IS_ENABLED(CONFIG_FS_VERITY) && 1873 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS); 1874 } 1875 1876 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1877 1878 /* 1879 * Codes for operating systems 1880 */ 1881 #define EXT4_OS_LINUX 0 1882 #define EXT4_OS_HURD 1 1883 #define EXT4_OS_MASIX 2 1884 #define EXT4_OS_FREEBSD 3 1885 #define EXT4_OS_LITES 4 1886 1887 /* 1888 * Revision levels 1889 */ 1890 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1891 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1892 1893 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1894 1895 #define EXT4_GOOD_OLD_INODE_SIZE 128 1896 1897 #define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN) 1898 #define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX 1899 #define EXT4_TIMESTAMP_MIN S32_MIN 1900 1901 /* 1902 * Feature set definitions 1903 */ 1904 1905 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1906 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1907 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1908 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1909 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1910 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1911 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1912 /* 1913 * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes 1914 * incompatible only if fast commit blocks are present in the FS. Since we 1915 * clear the journal (and thus the fast commit blocks), we don't mark FS as 1916 * incompatible. We also have a JBD2 incompat feature, which gets set when 1917 * there are fast commit blocks present in the journal. 1918 */ 1919 #define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400 1920 #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800 1921 1922 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1923 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1924 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1925 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1926 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1927 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1928 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1929 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1930 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1931 /* 1932 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1933 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1934 * all other data structures' checksums. However, the METADATA_CSUM and 1935 * GDT_CSUM bits are mutually exclusive. 1936 */ 1937 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1938 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1939 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 1940 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000 1941 1942 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1943 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1944 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1945 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1946 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1947 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1948 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1949 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1950 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1951 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1952 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1953 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 1954 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1955 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1956 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1957 #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000 1958 1959 extern void ext4_update_dynamic_rev(struct super_block *sb); 1960 1961 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 1962 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1963 { \ 1964 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1965 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 1966 } \ 1967 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1968 { \ 1969 ext4_update_dynamic_rev(sb); \ 1970 EXT4_SB(sb)->s_es->s_feature_compat |= \ 1971 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1972 } \ 1973 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1974 { \ 1975 EXT4_SB(sb)->s_es->s_feature_compat &= \ 1976 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1977 } 1978 1979 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 1980 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1981 { \ 1982 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1983 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 1984 } \ 1985 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1986 { \ 1987 ext4_update_dynamic_rev(sb); \ 1988 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 1989 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1990 } \ 1991 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1992 { \ 1993 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 1994 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1995 } 1996 1997 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 1998 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1999 { \ 2000 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 2001 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 2002 } \ 2003 static inline void ext4_set_feature_##name(struct super_block *sb) \ 2004 { \ 2005 ext4_update_dynamic_rev(sb); \ 2006 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 2007 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 2008 } \ 2009 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 2010 { \ 2011 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 2012 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 2013 } 2014 2015 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 2016 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 2017 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 2018 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 2019 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 2020 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 2021 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 2022 EXT4_FEATURE_COMPAT_FUNCS(fast_commit, FAST_COMMIT) 2023 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES) 2024 2025 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 2026 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 2027 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 2028 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 2029 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 2030 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 2031 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 2032 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 2033 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 2034 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 2035 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 2036 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 2037 EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY) 2038 2039 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 2040 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 2041 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 2042 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 2043 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 2044 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 2045 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 2046 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 2047 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 2048 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 2049 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 2050 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 2051 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 2052 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 2053 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 2054 EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD) 2055 2056 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2057 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2058 EXT4_FEATURE_INCOMPAT_META_BG) 2059 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2060 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2061 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 2062 2063 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2064 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2065 EXT4_FEATURE_INCOMPAT_RECOVER| \ 2066 EXT4_FEATURE_INCOMPAT_META_BG) 2067 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2068 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2069 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 2070 2071 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2072 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2073 EXT4_FEATURE_INCOMPAT_RECOVER| \ 2074 EXT4_FEATURE_INCOMPAT_META_BG| \ 2075 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 2076 EXT4_FEATURE_INCOMPAT_64BIT| \ 2077 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 2078 EXT4_FEATURE_INCOMPAT_EA_INODE| \ 2079 EXT4_FEATURE_INCOMPAT_MMP | \ 2080 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 2081 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 2082 EXT4_FEATURE_INCOMPAT_CASEFOLD | \ 2083 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \ 2084 EXT4_FEATURE_INCOMPAT_LARGEDIR) 2085 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2086 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2087 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 2088 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 2089 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 2090 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 2091 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 2092 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 2093 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 2094 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 2095 EXT4_FEATURE_RO_COMPAT_PROJECT |\ 2096 EXT4_FEATURE_RO_COMPAT_VERITY) 2097 2098 #define EXTN_FEATURE_FUNCS(ver) \ 2099 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 2100 { \ 2101 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 2102 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 2103 } \ 2104 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 2105 { \ 2106 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 2107 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 2108 } \ 2109 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 2110 { \ 2111 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 2112 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 2113 } 2114 2115 EXTN_FEATURE_FUNCS(2) 2116 EXTN_FEATURE_FUNCS(3) 2117 EXTN_FEATURE_FUNCS(4) 2118 2119 static inline bool ext4_has_compat_features(struct super_block *sb) 2120 { 2121 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 2122 } 2123 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 2124 { 2125 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 2126 } 2127 static inline bool ext4_has_incompat_features(struct super_block *sb) 2128 { 2129 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 2130 } 2131 2132 /* 2133 * Superblock flags 2134 */ 2135 #define EXT4_FLAGS_RESIZING 0 2136 #define EXT4_FLAGS_SHUTDOWN 1 2137 #define EXT4_FLAGS_BDEV_IS_DAX 2 2138 2139 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi) 2140 { 2141 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 2142 } 2143 2144 2145 /* 2146 * Default values for user and/or group using reserved blocks 2147 */ 2148 #define EXT4_DEF_RESUID 0 2149 #define EXT4_DEF_RESGID 0 2150 2151 /* 2152 * Default project ID 2153 */ 2154 #define EXT4_DEF_PROJID 0 2155 2156 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 2157 2158 /* 2159 * Default mount options 2160 */ 2161 #define EXT4_DEFM_DEBUG 0x0001 2162 #define EXT4_DEFM_BSDGROUPS 0x0002 2163 #define EXT4_DEFM_XATTR_USER 0x0004 2164 #define EXT4_DEFM_ACL 0x0008 2165 #define EXT4_DEFM_UID16 0x0010 2166 #define EXT4_DEFM_JMODE 0x0060 2167 #define EXT4_DEFM_JMODE_DATA 0x0020 2168 #define EXT4_DEFM_JMODE_ORDERED 0x0040 2169 #define EXT4_DEFM_JMODE_WBACK 0x0060 2170 #define EXT4_DEFM_NOBARRIER 0x0100 2171 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 2172 #define EXT4_DEFM_DISCARD 0x0400 2173 #define EXT4_DEFM_NODELALLOC 0x0800 2174 2175 /* 2176 * Default journal batch times 2177 */ 2178 #define EXT4_DEF_MIN_BATCH_TIME 0 2179 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 2180 2181 /* 2182 * Minimum number of groups in a flexgroup before we separate out 2183 * directories into the first block group of a flexgroup 2184 */ 2185 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 2186 2187 /* 2188 * Structure of a directory entry 2189 */ 2190 #define EXT4_NAME_LEN 255 2191 2192 struct ext4_dir_entry { 2193 __le32 inode; /* Inode number */ 2194 __le16 rec_len; /* Directory entry length */ 2195 __le16 name_len; /* Name length */ 2196 char name[EXT4_NAME_LEN]; /* File name */ 2197 }; 2198 2199 /* 2200 * The new version of the directory entry. Since EXT4 structures are 2201 * stored in intel byte order, and the name_len field could never be 2202 * bigger than 255 chars, it's safe to reclaim the extra byte for the 2203 * file_type field. 2204 */ 2205 struct ext4_dir_entry_2 { 2206 __le32 inode; /* Inode number */ 2207 __le16 rec_len; /* Directory entry length */ 2208 __u8 name_len; /* Name length */ 2209 __u8 file_type; /* See file type macros EXT4_FT_* below */ 2210 char name[EXT4_NAME_LEN]; /* File name */ 2211 }; 2212 2213 /* 2214 * This is a bogus directory entry at the end of each leaf block that 2215 * records checksums. 2216 */ 2217 struct ext4_dir_entry_tail { 2218 __le32 det_reserved_zero1; /* Pretend to be unused */ 2219 __le16 det_rec_len; /* 12 */ 2220 __u8 det_reserved_zero2; /* Zero name length */ 2221 __u8 det_reserved_ft; /* 0xDE, fake file type */ 2222 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 2223 }; 2224 2225 #define EXT4_DIRENT_TAIL(block, blocksize) \ 2226 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 2227 ((blocksize) - \ 2228 sizeof(struct ext4_dir_entry_tail)))) 2229 2230 /* 2231 * Ext4 directory file types. Only the low 3 bits are used. The 2232 * other bits are reserved for now. 2233 */ 2234 #define EXT4_FT_UNKNOWN 0 2235 #define EXT4_FT_REG_FILE 1 2236 #define EXT4_FT_DIR 2 2237 #define EXT4_FT_CHRDEV 3 2238 #define EXT4_FT_BLKDEV 4 2239 #define EXT4_FT_FIFO 5 2240 #define EXT4_FT_SOCK 6 2241 #define EXT4_FT_SYMLINK 7 2242 2243 #define EXT4_FT_MAX 8 2244 2245 #define EXT4_FT_DIR_CSUM 0xDE 2246 2247 /* 2248 * EXT4_DIR_PAD defines the directory entries boundaries 2249 * 2250 * NOTE: It must be a multiple of 4 2251 */ 2252 #define EXT4_DIR_PAD 4 2253 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 2254 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 2255 ~EXT4_DIR_ROUND) 2256 #define EXT4_MAX_REC_LEN ((1<<16)-1) 2257 2258 /* 2259 * If we ever get support for fs block sizes > page_size, we'll need 2260 * to remove the #if statements in the next two functions... 2261 */ 2262 static inline unsigned int 2263 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 2264 { 2265 unsigned len = le16_to_cpu(dlen); 2266 2267 #if (PAGE_SIZE >= 65536) 2268 if (len == EXT4_MAX_REC_LEN || len == 0) 2269 return blocksize; 2270 return (len & 65532) | ((len & 3) << 16); 2271 #else 2272 return len; 2273 #endif 2274 } 2275 2276 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 2277 { 2278 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 2279 BUG(); 2280 #if (PAGE_SIZE >= 65536) 2281 if (len < 65536) 2282 return cpu_to_le16(len); 2283 if (len == blocksize) { 2284 if (blocksize == 65536) 2285 return cpu_to_le16(EXT4_MAX_REC_LEN); 2286 else 2287 return cpu_to_le16(0); 2288 } 2289 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 2290 #else 2291 return cpu_to_le16(len); 2292 #endif 2293 } 2294 2295 /* 2296 * Hash Tree Directory indexing 2297 * (c) Daniel Phillips, 2001 2298 */ 2299 2300 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2301 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2302 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \ 2303 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir))) 2304 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2305 2306 /* Legal values for the dx_root hash_version field: */ 2307 2308 #define DX_HASH_LEGACY 0 2309 #define DX_HASH_HALF_MD4 1 2310 #define DX_HASH_TEA 2 2311 #define DX_HASH_LEGACY_UNSIGNED 3 2312 #define DX_HASH_HALF_MD4_UNSIGNED 4 2313 #define DX_HASH_TEA_UNSIGNED 5 2314 2315 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 2316 const void *address, unsigned int length) 2317 { 2318 struct { 2319 struct shash_desc shash; 2320 char ctx[4]; 2321 } desc; 2322 2323 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2324 2325 desc.shash.tfm = sbi->s_chksum_driver; 2326 *(u32 *)desc.ctx = crc; 2327 2328 BUG_ON(crypto_shash_update(&desc.shash, address, length)); 2329 2330 return *(u32 *)desc.ctx; 2331 } 2332 2333 #ifdef __KERNEL__ 2334 2335 /* hash info structure used by the directory hash */ 2336 struct dx_hash_info 2337 { 2338 u32 hash; 2339 u32 minor_hash; 2340 int hash_version; 2341 u32 *seed; 2342 }; 2343 2344 2345 /* 32 and 64 bit signed EOF for dx directories */ 2346 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2347 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2348 2349 2350 /* 2351 * Control parameters used by ext4_htree_next_block 2352 */ 2353 #define HASH_NB_ALWAYS 1 2354 2355 struct ext4_filename { 2356 const struct qstr *usr_fname; 2357 struct fscrypt_str disk_name; 2358 struct dx_hash_info hinfo; 2359 #ifdef CONFIG_FS_ENCRYPTION 2360 struct fscrypt_str crypto_buf; 2361 #endif 2362 #ifdef CONFIG_UNICODE 2363 struct fscrypt_str cf_name; 2364 #endif 2365 }; 2366 2367 #define fname_name(p) ((p)->disk_name.name) 2368 #define fname_len(p) ((p)->disk_name.len) 2369 2370 /* 2371 * Describe an inode's exact location on disk and in memory 2372 */ 2373 struct ext4_iloc 2374 { 2375 struct buffer_head *bh; 2376 unsigned long offset; 2377 ext4_group_t block_group; 2378 }; 2379 2380 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2381 { 2382 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2383 } 2384 2385 static inline bool ext4_is_quota_file(struct inode *inode) 2386 { 2387 return IS_NOQUOTA(inode) && 2388 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL); 2389 } 2390 2391 /* 2392 * This structure is stuffed into the struct file's private_data field 2393 * for directories. It is where we put information so that we can do 2394 * readdir operations in hash tree order. 2395 */ 2396 struct dir_private_info { 2397 struct rb_root root; 2398 struct rb_node *curr_node; 2399 struct fname *extra_fname; 2400 loff_t last_pos; 2401 __u32 curr_hash; 2402 __u32 curr_minor_hash; 2403 __u32 next_hash; 2404 }; 2405 2406 /* calculate the first block number of the group */ 2407 static inline ext4_fsblk_t 2408 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2409 { 2410 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2411 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2412 } 2413 2414 /* 2415 * Special error return code only used by dx_probe() and its callers. 2416 */ 2417 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2418 2419 /* htree levels for ext4 */ 2420 #define EXT4_HTREE_LEVEL_COMPAT 2 2421 #define EXT4_HTREE_LEVEL 3 2422 2423 static inline int ext4_dir_htree_level(struct super_block *sb) 2424 { 2425 return ext4_has_feature_largedir(sb) ? 2426 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT; 2427 } 2428 2429 /* 2430 * Timeout and state flag for lazy initialization inode thread. 2431 */ 2432 #define EXT4_DEF_LI_WAIT_MULT 10 2433 #define EXT4_DEF_LI_MAX_START_DELAY 5 2434 #define EXT4_LAZYINIT_QUIT 0x0001 2435 #define EXT4_LAZYINIT_RUNNING 0x0002 2436 2437 /* 2438 * Lazy inode table initialization info 2439 */ 2440 struct ext4_lazy_init { 2441 unsigned long li_state; 2442 struct list_head li_request_list; 2443 struct mutex li_list_mtx; 2444 }; 2445 2446 enum ext4_li_mode { 2447 EXT4_LI_MODE_PREFETCH_BBITMAP, 2448 EXT4_LI_MODE_ITABLE, 2449 }; 2450 2451 struct ext4_li_request { 2452 struct super_block *lr_super; 2453 enum ext4_li_mode lr_mode; 2454 ext4_group_t lr_first_not_zeroed; 2455 ext4_group_t lr_next_group; 2456 struct list_head lr_request; 2457 unsigned long lr_next_sched; 2458 unsigned long lr_timeout; 2459 }; 2460 2461 struct ext4_features { 2462 struct kobject f_kobj; 2463 struct completion f_kobj_unregister; 2464 }; 2465 2466 /* 2467 * This structure will be used for multiple mount protection. It will be 2468 * written into the block number saved in the s_mmp_block field in the 2469 * superblock. Programs that check MMP should assume that if 2470 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2471 * to use the filesystem, regardless of how old the timestamp is. 2472 */ 2473 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2474 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2475 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2476 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2477 2478 struct mmp_struct { 2479 __le32 mmp_magic; /* Magic number for MMP */ 2480 __le32 mmp_seq; /* Sequence no. updated periodically */ 2481 2482 /* 2483 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2484 * purposes and do not affect the correctness of the algorithm 2485 */ 2486 __le64 mmp_time; /* Time last updated */ 2487 char mmp_nodename[64]; /* Node which last updated MMP block */ 2488 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2489 2490 /* 2491 * mmp_check_interval is used to verify if the MMP block has been 2492 * updated on the block device. The value is updated based on the 2493 * maximum time to write the MMP block during an update cycle. 2494 */ 2495 __le16 mmp_check_interval; 2496 2497 __le16 mmp_pad1; 2498 __le32 mmp_pad2[226]; 2499 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2500 }; 2501 2502 /* arguments passed to the mmp thread */ 2503 struct mmpd_data { 2504 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2505 struct super_block *sb; /* super block of the fs */ 2506 }; 2507 2508 /* 2509 * Check interval multiplier 2510 * The MMP block is written every update interval and initially checked every 2511 * update interval x the multiplier (the value is then adapted based on the 2512 * write latency). The reason is that writes can be delayed under load and we 2513 * don't want readers to incorrectly assume that the filesystem is no longer 2514 * in use. 2515 */ 2516 #define EXT4_MMP_CHECK_MULT 2UL 2517 2518 /* 2519 * Minimum interval for MMP checking in seconds. 2520 */ 2521 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2522 2523 /* 2524 * Maximum interval for MMP checking in seconds. 2525 */ 2526 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2527 2528 /* 2529 * Function prototypes 2530 */ 2531 2532 /* 2533 * Ok, these declarations are also in <linux/kernel.h> but none of the 2534 * ext4 source programs needs to include it so they are duplicated here. 2535 */ 2536 # define NORET_TYPE /**/ 2537 # define ATTRIB_NORET __attribute__((noreturn)) 2538 # define NORET_AND noreturn, 2539 2540 /* bitmap.c */ 2541 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2542 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2543 struct ext4_group_desc *gdp, 2544 struct buffer_head *bh, int sz); 2545 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2546 struct ext4_group_desc *gdp, 2547 struct buffer_head *bh, int sz); 2548 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2549 struct ext4_group_desc *gdp, 2550 struct buffer_head *bh); 2551 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2552 struct ext4_group_desc *gdp, 2553 struct buffer_head *bh); 2554 2555 /* balloc.c */ 2556 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2557 ext4_fsblk_t blocknr, 2558 ext4_group_t *blockgrpp, 2559 ext4_grpblk_t *offsetp); 2560 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2561 ext4_fsblk_t block); 2562 2563 extern unsigned int ext4_block_group(struct super_block *sb, 2564 ext4_fsblk_t blocknr); 2565 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2566 ext4_fsblk_t blocknr); 2567 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2568 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2569 ext4_group_t group); 2570 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2571 ext4_fsblk_t goal, 2572 unsigned int flags, 2573 unsigned long *count, 2574 int *errp); 2575 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2576 s64 nclusters, unsigned int flags); 2577 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2578 extern void ext4_check_blocks_bitmap(struct super_block *); 2579 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2580 ext4_group_t block_group, 2581 struct buffer_head ** bh); 2582 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2583 2584 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2585 ext4_group_t block_group, 2586 bool ignore_locked); 2587 extern int ext4_wait_block_bitmap(struct super_block *sb, 2588 ext4_group_t block_group, 2589 struct buffer_head *bh); 2590 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2591 ext4_group_t block_group); 2592 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2593 ext4_group_t block_group, 2594 struct ext4_group_desc *gdp); 2595 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2596 2597 #ifdef CONFIG_UNICODE 2598 extern void ext4_fname_setup_ci_filename(struct inode *dir, 2599 const struct qstr *iname, 2600 struct fscrypt_str *fname); 2601 #endif 2602 2603 #ifdef CONFIG_FS_ENCRYPTION 2604 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst, 2605 const struct fscrypt_name *src) 2606 { 2607 memset(dst, 0, sizeof(*dst)); 2608 2609 dst->usr_fname = src->usr_fname; 2610 dst->disk_name = src->disk_name; 2611 dst->hinfo.hash = src->hash; 2612 dst->hinfo.minor_hash = src->minor_hash; 2613 dst->crypto_buf = src->crypto_buf; 2614 } 2615 2616 static inline int ext4_fname_setup_filename(struct inode *dir, 2617 const struct qstr *iname, 2618 int lookup, 2619 struct ext4_filename *fname) 2620 { 2621 struct fscrypt_name name; 2622 int err; 2623 2624 err = fscrypt_setup_filename(dir, iname, lookup, &name); 2625 if (err) 2626 return err; 2627 2628 ext4_fname_from_fscrypt_name(fname, &name); 2629 2630 #ifdef CONFIG_UNICODE 2631 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name); 2632 #endif 2633 return 0; 2634 } 2635 2636 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2637 struct dentry *dentry, 2638 struct ext4_filename *fname) 2639 { 2640 struct fscrypt_name name; 2641 int err; 2642 2643 err = fscrypt_prepare_lookup(dir, dentry, &name); 2644 if (err) 2645 return err; 2646 2647 ext4_fname_from_fscrypt_name(fname, &name); 2648 2649 #ifdef CONFIG_UNICODE 2650 ext4_fname_setup_ci_filename(dir, &dentry->d_name, &fname->cf_name); 2651 #endif 2652 return 0; 2653 } 2654 2655 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2656 { 2657 struct fscrypt_name name; 2658 2659 name.crypto_buf = fname->crypto_buf; 2660 fscrypt_free_filename(&name); 2661 2662 fname->crypto_buf.name = NULL; 2663 fname->usr_fname = NULL; 2664 fname->disk_name.name = NULL; 2665 2666 #ifdef CONFIG_UNICODE 2667 kfree(fname->cf_name.name); 2668 fname->cf_name.name = NULL; 2669 #endif 2670 } 2671 #else /* !CONFIG_FS_ENCRYPTION */ 2672 static inline int ext4_fname_setup_filename(struct inode *dir, 2673 const struct qstr *iname, 2674 int lookup, 2675 struct ext4_filename *fname) 2676 { 2677 fname->usr_fname = iname; 2678 fname->disk_name.name = (unsigned char *) iname->name; 2679 fname->disk_name.len = iname->len; 2680 2681 #ifdef CONFIG_UNICODE 2682 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name); 2683 #endif 2684 2685 return 0; 2686 } 2687 2688 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2689 struct dentry *dentry, 2690 struct ext4_filename *fname) 2691 { 2692 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname); 2693 } 2694 2695 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2696 { 2697 #ifdef CONFIG_UNICODE 2698 kfree(fname->cf_name.name); 2699 fname->cf_name.name = NULL; 2700 #endif 2701 } 2702 #endif /* !CONFIG_FS_ENCRYPTION */ 2703 2704 /* dir.c */ 2705 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2706 struct file *, 2707 struct ext4_dir_entry_2 *, 2708 struct buffer_head *, char *, int, 2709 unsigned int); 2710 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2711 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2712 (de), (bh), (buf), (size), (offset))) 2713 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2714 __u32 minor_hash, 2715 struct ext4_dir_entry_2 *dirent, 2716 struct fscrypt_str *ent_name); 2717 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2718 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2719 struct buffer_head *bh, 2720 void *buf, int buf_size, 2721 struct ext4_filename *fname, 2722 struct ext4_dir_entry_2 **dest_de); 2723 void ext4_insert_dentry(struct inode *inode, 2724 struct ext4_dir_entry_2 *de, 2725 int buf_size, 2726 struct ext4_filename *fname); 2727 static inline void ext4_update_dx_flag(struct inode *inode) 2728 { 2729 if (!ext4_has_feature_dir_index(inode->i_sb) && 2730 ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) { 2731 /* ext4_iget() should have caught this... */ 2732 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb)); 2733 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2734 } 2735 } 2736 static const unsigned char ext4_filetype_table[] = { 2737 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2738 }; 2739 2740 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2741 { 2742 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2743 return DT_UNKNOWN; 2744 2745 return ext4_filetype_table[filetype]; 2746 } 2747 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2748 void *buf, int buf_size); 2749 2750 /* fsync.c */ 2751 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2752 2753 /* hash.c */ 2754 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len, 2755 struct dx_hash_info *hinfo); 2756 2757 /* ialloc.c */ 2758 extern int ext4_mark_inode_used(struct super_block *sb, int ino); 2759 extern struct inode *__ext4_new_inode(struct user_namespace *, handle_t *, 2760 struct inode *, umode_t, 2761 const struct qstr *qstr, __u32 goal, 2762 uid_t *owner, __u32 i_flags, 2763 int handle_type, unsigned int line_no, 2764 int nblocks); 2765 2766 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \ 2767 __ext4_new_inode(&init_user_ns, (handle), (dir), (mode), (qstr), \ 2768 (goal), (owner), i_flags, 0, 0, 0) 2769 #define ext4_new_inode_start_handle(mnt_userns, dir, mode, qstr, goal, owner, \ 2770 type, nblocks) \ 2771 __ext4_new_inode((mnt_userns), NULL, (dir), (mode), (qstr), (goal), (owner), \ 2772 0, (type), __LINE__, (nblocks)) 2773 2774 2775 extern void ext4_free_inode(handle_t *, struct inode *); 2776 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2777 extern unsigned long ext4_count_free_inodes(struct super_block *); 2778 extern unsigned long ext4_count_dirs(struct super_block *); 2779 extern void ext4_check_inodes_bitmap(struct super_block *); 2780 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2781 extern int ext4_init_inode_table(struct super_block *sb, 2782 ext4_group_t group, int barrier); 2783 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2784 2785 /* fast_commit.c */ 2786 int ext4_fc_info_show(struct seq_file *seq, void *v); 2787 void ext4_fc_init(struct super_block *sb, journal_t *journal); 2788 void ext4_fc_init_inode(struct inode *inode); 2789 void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start, 2790 ext4_lblk_t end); 2791 void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode, 2792 struct dentry *dentry); 2793 void __ext4_fc_track_link(handle_t *handle, struct inode *inode, 2794 struct dentry *dentry); 2795 void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry); 2796 void ext4_fc_track_link(handle_t *handle, struct dentry *dentry); 2797 void __ext4_fc_track_create(handle_t *handle, struct inode *inode, 2798 struct dentry *dentry); 2799 void ext4_fc_track_create(handle_t *handle, struct dentry *dentry); 2800 void ext4_fc_track_inode(handle_t *handle, struct inode *inode); 2801 void ext4_fc_mark_ineligible(struct super_block *sb, int reason); 2802 void ext4_fc_start_ineligible(struct super_block *sb, int reason); 2803 void ext4_fc_stop_ineligible(struct super_block *sb); 2804 void ext4_fc_start_update(struct inode *inode); 2805 void ext4_fc_stop_update(struct inode *inode); 2806 void ext4_fc_del(struct inode *inode); 2807 bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block); 2808 void ext4_fc_replay_cleanup(struct super_block *sb); 2809 int ext4_fc_commit(journal_t *journal, tid_t commit_tid); 2810 int __init ext4_fc_init_dentry_cache(void); 2811 2812 /* mballoc.c */ 2813 extern const struct seq_operations ext4_mb_seq_groups_ops; 2814 extern long ext4_mb_stats; 2815 extern long ext4_mb_max_to_scan; 2816 extern int ext4_mb_init(struct super_block *); 2817 extern int ext4_mb_release(struct super_block *); 2818 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2819 struct ext4_allocation_request *, int *); 2820 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2821 extern void ext4_discard_preallocations(struct inode *, unsigned int); 2822 extern int __init ext4_init_mballoc(void); 2823 extern void ext4_exit_mballoc(void); 2824 extern ext4_group_t ext4_mb_prefetch(struct super_block *sb, 2825 ext4_group_t group, 2826 unsigned int nr, int *cnt); 2827 extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group, 2828 unsigned int nr); 2829 2830 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2831 struct buffer_head *bh, ext4_fsblk_t block, 2832 unsigned long count, int flags); 2833 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2834 ext4_group_t ngroups); 2835 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2836 ext4_group_t i, struct ext4_group_desc *desc); 2837 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2838 ext4_fsblk_t block, unsigned long count); 2839 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2840 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid); 2841 extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block, 2842 int len, int state); 2843 2844 /* inode.c */ 2845 void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw, 2846 struct ext4_inode_info *ei); 2847 int ext4_inode_is_fast_symlink(struct inode *inode); 2848 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2849 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2850 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count, 2851 bool wait, struct buffer_head **bhs); 2852 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2853 struct buffer_head *bh_result, int create); 2854 int ext4_get_block(struct inode *inode, sector_t iblock, 2855 struct buffer_head *bh_result, int create); 2856 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2857 struct buffer_head *bh, int create); 2858 int ext4_walk_page_buffers(handle_t *handle, 2859 struct buffer_head *head, 2860 unsigned from, 2861 unsigned to, 2862 int *partial, 2863 int (*fn)(handle_t *handle, 2864 struct buffer_head *bh)); 2865 int do_journal_get_write_access(handle_t *handle, 2866 struct buffer_head *bh); 2867 #define FALL_BACK_TO_NONDELALLOC 1 2868 #define CONVERT_INLINE_DATA 2 2869 2870 typedef enum { 2871 EXT4_IGET_NORMAL = 0, 2872 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */ 2873 EXT4_IGET_HANDLE = 0x0002 /* Inode # is from a handle */ 2874 } ext4_iget_flags; 2875 2876 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, 2877 ext4_iget_flags flags, const char *function, 2878 unsigned int line); 2879 2880 #define ext4_iget(sb, ino, flags) \ 2881 __ext4_iget((sb), (ino), (flags), __func__, __LINE__) 2882 2883 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2884 extern int ext4_setattr(struct user_namespace *, struct dentry *, 2885 struct iattr *); 2886 extern int ext4_getattr(struct user_namespace *, const struct path *, 2887 struct kstat *, u32, unsigned int); 2888 extern void ext4_evict_inode(struct inode *); 2889 extern void ext4_clear_inode(struct inode *); 2890 extern int ext4_file_getattr(struct user_namespace *, const struct path *, 2891 struct kstat *, u32, unsigned int); 2892 extern int ext4_sync_inode(handle_t *, struct inode *); 2893 extern void ext4_dirty_inode(struct inode *, int); 2894 extern int ext4_change_inode_journal_flag(struct inode *, int); 2895 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2896 extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino, 2897 struct ext4_iloc *iloc); 2898 extern int ext4_inode_attach_jinode(struct inode *inode); 2899 extern int ext4_can_truncate(struct inode *inode); 2900 extern int ext4_truncate(struct inode *); 2901 extern int ext4_break_layouts(struct inode *); 2902 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2903 extern void ext4_set_inode_flags(struct inode *, bool init); 2904 extern int ext4_alloc_da_blocks(struct inode *inode); 2905 extern void ext4_set_aops(struct inode *inode); 2906 extern int ext4_writepage_trans_blocks(struct inode *); 2907 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2908 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2909 loff_t lstart, loff_t lend); 2910 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf); 2911 extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf); 2912 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2913 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 2914 extern void ext4_da_release_space(struct inode *inode, int to_free); 2915 extern void ext4_da_update_reserve_space(struct inode *inode, 2916 int used, int quota_claim); 2917 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 2918 ext4_fsblk_t pblk, ext4_lblk_t len); 2919 2920 /* indirect.c */ 2921 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2922 struct ext4_map_blocks *map, int flags); 2923 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2924 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2925 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2926 ext4_lblk_t start, ext4_lblk_t end); 2927 2928 /* ioctl.c */ 2929 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2930 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2931 extern void ext4_reset_inode_seed(struct inode *inode); 2932 2933 /* migrate.c */ 2934 extern int ext4_ext_migrate(struct inode *); 2935 extern int ext4_ind_migrate(struct inode *inode); 2936 2937 /* namei.c */ 2938 extern int ext4_init_new_dir(handle_t *handle, struct inode *dir, 2939 struct inode *inode); 2940 extern int ext4_dirblock_csum_verify(struct inode *inode, 2941 struct buffer_head *bh); 2942 extern int ext4_orphan_add(handle_t *, struct inode *); 2943 extern int ext4_orphan_del(handle_t *, struct inode *); 2944 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2945 __u32 start_minor_hash, __u32 *next_hash); 2946 extern int ext4_search_dir(struct buffer_head *bh, 2947 char *search_buf, 2948 int buf_size, 2949 struct inode *dir, 2950 struct ext4_filename *fname, 2951 unsigned int offset, 2952 struct ext4_dir_entry_2 **res_dir); 2953 extern int ext4_generic_delete_entry(struct inode *dir, 2954 struct ext4_dir_entry_2 *de_del, 2955 struct buffer_head *bh, 2956 void *entry_buf, 2957 int buf_size, 2958 int csum_size); 2959 extern bool ext4_empty_dir(struct inode *inode); 2960 2961 /* resize.c */ 2962 extern void ext4_kvfree_array_rcu(void *to_free); 2963 extern int ext4_group_add(struct super_block *sb, 2964 struct ext4_new_group_data *input); 2965 extern int ext4_group_extend(struct super_block *sb, 2966 struct ext4_super_block *es, 2967 ext4_fsblk_t n_blocks_count); 2968 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2969 2970 /* super.c */ 2971 extern struct buffer_head *ext4_sb_bread(struct super_block *sb, 2972 sector_t block, int op_flags); 2973 extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb, 2974 sector_t block); 2975 extern void ext4_read_bh_nowait(struct buffer_head *bh, int op_flags, 2976 bh_end_io_t *end_io); 2977 extern int ext4_read_bh(struct buffer_head *bh, int op_flags, 2978 bh_end_io_t *end_io); 2979 extern int ext4_read_bh_lock(struct buffer_head *bh, int op_flags, bool wait); 2980 extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block); 2981 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 2982 extern int ext4_calculate_overhead(struct super_block *sb); 2983 extern void ext4_superblock_csum_set(struct super_block *sb); 2984 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2985 ext4_group_t ngroup); 2986 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2987 char nbuf[16]); 2988 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb, 2989 ext4_group_t block_group, 2990 unsigned int flags); 2991 2992 extern __printf(7, 8) 2993 void __ext4_error(struct super_block *, const char *, unsigned int, bool, 2994 int, __u64, const char *, ...); 2995 extern __printf(6, 7) 2996 void __ext4_error_inode(struct inode *, const char *, unsigned int, 2997 ext4_fsblk_t, int, const char *, ...); 2998 extern __printf(5, 6) 2999 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 3000 const char *, ...); 3001 extern void __ext4_std_error(struct super_block *, const char *, 3002 unsigned int, int); 3003 extern __printf(4, 5) 3004 void __ext4_warning(struct super_block *, const char *, unsigned int, 3005 const char *, ...); 3006 extern __printf(4, 5) 3007 void __ext4_warning_inode(const struct inode *inode, const char *function, 3008 unsigned int line, const char *fmt, ...); 3009 extern __printf(3, 4) 3010 void __ext4_msg(struct super_block *, const char *, const char *, ...); 3011 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 3012 const char *, unsigned int, const char *); 3013 extern __printf(7, 8) 3014 void __ext4_grp_locked_error(const char *, unsigned int, 3015 struct super_block *, ext4_group_t, 3016 unsigned long, ext4_fsblk_t, 3017 const char *, ...); 3018 3019 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 3020 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 3021 3022 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \ 3023 __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a) 3024 3025 #define ext4_error_inode_block(inode, block, err, fmt, a...) \ 3026 __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \ 3027 (fmt), ## a) 3028 3029 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 3030 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 3031 3032 #define ext4_abort(sb, err, fmt, a...) \ 3033 __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a) 3034 3035 #ifdef CONFIG_PRINTK 3036 3037 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 3038 __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__) 3039 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 3040 __ext4_error_inode((inode), (func), (line), (block), \ 3041 (err), (fmt), ##__VA_ARGS__) 3042 #define ext4_error_file(file, func, line, block, fmt, ...) \ 3043 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 3044 #define ext4_error(sb, fmt, ...) \ 3045 __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt), \ 3046 ##__VA_ARGS__) 3047 #define ext4_error_err(sb, err, fmt, ...) \ 3048 __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt), \ 3049 ##__VA_ARGS__) 3050 #define ext4_warning(sb, fmt, ...) \ 3051 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 3052 #define ext4_warning_inode(inode, fmt, ...) \ 3053 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 3054 #define ext4_msg(sb, level, fmt, ...) \ 3055 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 3056 #define dump_mmp_msg(sb, mmp, msg) \ 3057 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 3058 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 3059 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 3060 fmt, ##__VA_ARGS__) 3061 3062 #else 3063 3064 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 3065 do { \ 3066 no_printk(fmt, ##__VA_ARGS__); \ 3067 __ext4_error_inode(inode, "", 0, block, 0, " "); \ 3068 } while (0) 3069 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 3070 do { \ 3071 no_printk(fmt, ##__VA_ARGS__); \ 3072 __ext4_error_inode(inode, "", 0, block, err, " "); \ 3073 } while (0) 3074 #define ext4_error_file(file, func, line, block, fmt, ...) \ 3075 do { \ 3076 no_printk(fmt, ##__VA_ARGS__); \ 3077 __ext4_error_file(file, "", 0, block, " "); \ 3078 } while (0) 3079 #define ext4_error(sb, fmt, ...) \ 3080 do { \ 3081 no_printk(fmt, ##__VA_ARGS__); \ 3082 __ext4_error(sb, "", 0, false, 0, 0, " "); \ 3083 } while (0) 3084 #define ext4_error_err(sb, err, fmt, ...) \ 3085 do { \ 3086 no_printk(fmt, ##__VA_ARGS__); \ 3087 __ext4_error(sb, "", 0, false, err, 0, " "); \ 3088 } while (0) 3089 #define ext4_warning(sb, fmt, ...) \ 3090 do { \ 3091 no_printk(fmt, ##__VA_ARGS__); \ 3092 __ext4_warning(sb, "", 0, " "); \ 3093 } while (0) 3094 #define ext4_warning_inode(inode, fmt, ...) \ 3095 do { \ 3096 no_printk(fmt, ##__VA_ARGS__); \ 3097 __ext4_warning_inode(inode, "", 0, " "); \ 3098 } while (0) 3099 #define ext4_msg(sb, level, fmt, ...) \ 3100 do { \ 3101 no_printk(fmt, ##__VA_ARGS__); \ 3102 __ext4_msg(sb, "", " "); \ 3103 } while (0) 3104 #define dump_mmp_msg(sb, mmp, msg) \ 3105 __dump_mmp_msg(sb, mmp, "", 0, "") 3106 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 3107 do { \ 3108 no_printk(fmt, ##__VA_ARGS__); \ 3109 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 3110 } while (0) 3111 3112 #endif 3113 3114 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 3115 struct ext4_group_desc *bg); 3116 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 3117 struct ext4_group_desc *bg); 3118 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 3119 struct ext4_group_desc *bg); 3120 extern __u32 ext4_free_group_clusters(struct super_block *sb, 3121 struct ext4_group_desc *bg); 3122 extern __u32 ext4_free_inodes_count(struct super_block *sb, 3123 struct ext4_group_desc *bg); 3124 extern __u32 ext4_used_dirs_count(struct super_block *sb, 3125 struct ext4_group_desc *bg); 3126 extern __u32 ext4_itable_unused_count(struct super_block *sb, 3127 struct ext4_group_desc *bg); 3128 extern void ext4_block_bitmap_set(struct super_block *sb, 3129 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3130 extern void ext4_inode_bitmap_set(struct super_block *sb, 3131 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3132 extern void ext4_inode_table_set(struct super_block *sb, 3133 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3134 extern void ext4_free_group_clusters_set(struct super_block *sb, 3135 struct ext4_group_desc *bg, 3136 __u32 count); 3137 extern void ext4_free_inodes_set(struct super_block *sb, 3138 struct ext4_group_desc *bg, __u32 count); 3139 extern void ext4_used_dirs_set(struct super_block *sb, 3140 struct ext4_group_desc *bg, __u32 count); 3141 extern void ext4_itable_unused_set(struct super_block *sb, 3142 struct ext4_group_desc *bg, __u32 count); 3143 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 3144 struct ext4_group_desc *gdp); 3145 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 3146 struct ext4_group_desc *gdp); 3147 extern int ext4_register_li_request(struct super_block *sb, 3148 ext4_group_t first_not_zeroed); 3149 3150 static inline int ext4_has_metadata_csum(struct super_block *sb) 3151 { 3152 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 3153 !EXT4_SB(sb)->s_chksum_driver); 3154 3155 return ext4_has_feature_metadata_csum(sb) && 3156 (EXT4_SB(sb)->s_chksum_driver != NULL); 3157 } 3158 3159 static inline int ext4_has_group_desc_csum(struct super_block *sb) 3160 { 3161 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb); 3162 } 3163 3164 #define ext4_read_incompat_64bit_val(es, name) \ 3165 (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \ 3166 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \ 3167 le32_to_cpu(es->name##_lo)) 3168 3169 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 3170 { 3171 return ext4_read_incompat_64bit_val(es, s_blocks_count); 3172 } 3173 3174 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 3175 { 3176 return ext4_read_incompat_64bit_val(es, s_r_blocks_count); 3177 } 3178 3179 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 3180 { 3181 return ext4_read_incompat_64bit_val(es, s_free_blocks_count); 3182 } 3183 3184 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 3185 ext4_fsblk_t blk) 3186 { 3187 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 3188 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 3189 } 3190 3191 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 3192 ext4_fsblk_t blk) 3193 { 3194 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 3195 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 3196 } 3197 3198 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 3199 ext4_fsblk_t blk) 3200 { 3201 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 3202 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 3203 } 3204 3205 static inline loff_t ext4_isize(struct super_block *sb, 3206 struct ext4_inode *raw_inode) 3207 { 3208 if (ext4_has_feature_largedir(sb) || 3209 S_ISREG(le16_to_cpu(raw_inode->i_mode))) 3210 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 3211 le32_to_cpu(raw_inode->i_size_lo); 3212 3213 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 3214 } 3215 3216 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 3217 { 3218 raw_inode->i_size_lo = cpu_to_le32(i_size); 3219 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 3220 } 3221 3222 static inline 3223 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 3224 ext4_group_t group) 3225 { 3226 struct ext4_group_info **grp_info; 3227 long indexv, indexh; 3228 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 3229 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 3230 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 3231 grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv); 3232 return grp_info[indexh]; 3233 } 3234 3235 /* 3236 * Reading s_groups_count requires using smp_rmb() afterwards. See 3237 * the locking protocol documented in the comments of ext4_group_add() 3238 * in resize.c 3239 */ 3240 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 3241 { 3242 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 3243 3244 smp_rmb(); 3245 return ngroups; 3246 } 3247 3248 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 3249 ext4_group_t block_group) 3250 { 3251 return block_group >> sbi->s_log_groups_per_flex; 3252 } 3253 3254 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 3255 { 3256 return 1 << sbi->s_log_groups_per_flex; 3257 } 3258 3259 #define ext4_std_error(sb, errno) \ 3260 do { \ 3261 if ((errno)) \ 3262 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 3263 } while (0) 3264 3265 #ifdef CONFIG_SMP 3266 /* Each CPU can accumulate percpu_counter_batch clusters in their local 3267 * counters. So we need to make sure we have free clusters more 3268 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 3269 */ 3270 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 3271 #else 3272 #define EXT4_FREECLUSTERS_WATERMARK 0 3273 #endif 3274 3275 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 3276 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 3277 { 3278 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 3279 !inode_is_locked(inode)); 3280 down_write(&EXT4_I(inode)->i_data_sem); 3281 if (newsize > EXT4_I(inode)->i_disksize) 3282 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize); 3283 up_write(&EXT4_I(inode)->i_data_sem); 3284 } 3285 3286 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 3287 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 3288 { 3289 int changed = 0; 3290 3291 if (newsize > inode->i_size) { 3292 i_size_write(inode, newsize); 3293 changed = 1; 3294 } 3295 if (newsize > EXT4_I(inode)->i_disksize) { 3296 ext4_update_i_disksize(inode, newsize); 3297 changed |= 2; 3298 } 3299 return changed; 3300 } 3301 3302 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 3303 loff_t len); 3304 3305 struct ext4_group_info { 3306 unsigned long bb_state; 3307 #ifdef AGGRESSIVE_CHECK 3308 unsigned long bb_check_counter; 3309 #endif 3310 struct rb_root bb_free_root; 3311 ext4_grpblk_t bb_first_free; /* first free block */ 3312 ext4_grpblk_t bb_free; /* total free blocks */ 3313 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 3314 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 3315 struct list_head bb_prealloc_list; 3316 #ifdef DOUBLE_CHECK 3317 void *bb_bitmap; 3318 #endif 3319 struct rw_semaphore alloc_sem; 3320 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 3321 * regions, index is order. 3322 * bb_counters[3] = 5 means 3323 * 5 free 8-block regions. */ 3324 }; 3325 3326 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 3327 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 3328 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 3329 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 3330 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \ 3331 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT) 3332 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \ 3333 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT) 3334 #define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4 3335 3336 #define EXT4_MB_GRP_NEED_INIT(grp) \ 3337 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 3338 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 3339 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3340 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 3341 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3342 3343 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 3344 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3345 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 3346 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3347 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 3348 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3349 #define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \ 3350 (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state))) 3351 3352 #define EXT4_MAX_CONTENTION 8 3353 #define EXT4_CONTENTION_THRESHOLD 2 3354 3355 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 3356 ext4_group_t group) 3357 { 3358 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 3359 } 3360 3361 /* 3362 * Returns true if the filesystem is busy enough that attempts to 3363 * access the block group locks has run into contention. 3364 */ 3365 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 3366 { 3367 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 3368 } 3369 3370 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 3371 { 3372 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 3373 if (spin_trylock(lock)) 3374 /* 3375 * We're able to grab the lock right away, so drop the 3376 * lock contention counter. 3377 */ 3378 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 3379 else { 3380 /* 3381 * The lock is busy, so bump the contention counter, 3382 * and then wait on the spin lock. 3383 */ 3384 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 3385 EXT4_MAX_CONTENTION); 3386 spin_lock(lock); 3387 } 3388 } 3389 3390 static inline void ext4_unlock_group(struct super_block *sb, 3391 ext4_group_t group) 3392 { 3393 spin_unlock(ext4_group_lock_ptr(sb, group)); 3394 } 3395 3396 #ifdef CONFIG_QUOTA 3397 static inline bool ext4_quota_capable(struct super_block *sb) 3398 { 3399 return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb)); 3400 } 3401 3402 static inline bool ext4_is_quota_journalled(struct super_block *sb) 3403 { 3404 struct ext4_sb_info *sbi = EXT4_SB(sb); 3405 3406 return (ext4_has_feature_quota(sb) || 3407 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]); 3408 } 3409 #endif 3410 3411 /* 3412 * Block validity checking 3413 */ 3414 #define ext4_check_indirect_blockref(inode, bh) \ 3415 ext4_check_blockref(__func__, __LINE__, inode, \ 3416 (__le32 *)(bh)->b_data, \ 3417 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 3418 3419 #define ext4_ind_check_inode(inode) \ 3420 ext4_check_blockref(__func__, __LINE__, inode, \ 3421 EXT4_I(inode)->i_data, \ 3422 EXT4_NDIR_BLOCKS) 3423 3424 /* 3425 * Inodes and files operations 3426 */ 3427 3428 /* dir.c */ 3429 extern const struct file_operations ext4_dir_operations; 3430 3431 /* file.c */ 3432 extern const struct inode_operations ext4_file_inode_operations; 3433 extern const struct file_operations ext4_file_operations; 3434 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 3435 3436 /* inline.c */ 3437 extern int ext4_get_max_inline_size(struct inode *inode); 3438 extern int ext4_find_inline_data_nolock(struct inode *inode); 3439 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 3440 unsigned int len); 3441 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 3442 3443 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 3444 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 3445 struct inode *inode, 3446 loff_t pos, unsigned len, 3447 unsigned flags, 3448 struct page **pagep); 3449 extern int ext4_write_inline_data_end(struct inode *inode, 3450 loff_t pos, unsigned len, 3451 unsigned copied, 3452 struct page *page); 3453 extern struct buffer_head * 3454 ext4_journalled_write_inline_data(struct inode *inode, 3455 unsigned len, 3456 struct page *page); 3457 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 3458 struct inode *inode, 3459 loff_t pos, unsigned len, 3460 unsigned flags, 3461 struct page **pagep, 3462 void **fsdata); 3463 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 3464 unsigned len, unsigned copied, 3465 struct page *page); 3466 extern int ext4_try_add_inline_entry(handle_t *handle, 3467 struct ext4_filename *fname, 3468 struct inode *dir, struct inode *inode); 3469 extern int ext4_try_create_inline_dir(handle_t *handle, 3470 struct inode *parent, 3471 struct inode *inode); 3472 extern int ext4_read_inline_dir(struct file *filp, 3473 struct dir_context *ctx, 3474 int *has_inline_data); 3475 extern int ext4_inlinedir_to_tree(struct file *dir_file, 3476 struct inode *dir, ext4_lblk_t block, 3477 struct dx_hash_info *hinfo, 3478 __u32 start_hash, __u32 start_minor_hash, 3479 int *has_inline_data); 3480 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3481 struct ext4_filename *fname, 3482 struct ext4_dir_entry_2 **res_dir, 3483 int *has_inline_data); 3484 extern int ext4_delete_inline_entry(handle_t *handle, 3485 struct inode *dir, 3486 struct ext4_dir_entry_2 *de_del, 3487 struct buffer_head *bh, 3488 int *has_inline_data); 3489 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); 3490 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3491 struct ext4_dir_entry_2 **parent_de, 3492 int *retval); 3493 extern int ext4_inline_data_fiemap(struct inode *inode, 3494 struct fiemap_extent_info *fieinfo, 3495 int *has_inline, __u64 start, __u64 len); 3496 3497 struct iomap; 3498 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap); 3499 3500 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3501 3502 extern int ext4_convert_inline_data(struct inode *inode); 3503 3504 static inline int ext4_has_inline_data(struct inode *inode) 3505 { 3506 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3507 EXT4_I(inode)->i_inline_off; 3508 } 3509 3510 /* namei.c */ 3511 extern const struct inode_operations ext4_dir_inode_operations; 3512 extern const struct inode_operations ext4_special_inode_operations; 3513 extern struct dentry *ext4_get_parent(struct dentry *child); 3514 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3515 struct ext4_dir_entry_2 *de, 3516 int blocksize, int csum_size, 3517 unsigned int parent_ino, int dotdot_real_len); 3518 extern void ext4_initialize_dirent_tail(struct buffer_head *bh, 3519 unsigned int blocksize); 3520 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode, 3521 struct buffer_head *bh); 3522 extern int ext4_ci_compare(const struct inode *parent, 3523 const struct qstr *fname, 3524 const struct qstr *entry, bool quick); 3525 extern int __ext4_unlink(handle_t *handle, struct inode *dir, const struct qstr *d_name, 3526 struct inode *inode); 3527 extern int __ext4_link(struct inode *dir, struct inode *inode, 3528 struct dentry *dentry); 3529 3530 #define S_SHIFT 12 3531 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = { 3532 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3533 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3534 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3535 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3536 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3537 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3538 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3539 }; 3540 3541 static inline void ext4_set_de_type(struct super_block *sb, 3542 struct ext4_dir_entry_2 *de, 3543 umode_t mode) { 3544 if (ext4_has_feature_filetype(sb)) 3545 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3546 } 3547 3548 /* readpages.c */ 3549 extern int ext4_mpage_readpages(struct inode *inode, 3550 struct readahead_control *rac, struct page *page); 3551 extern int __init ext4_init_post_read_processing(void); 3552 extern void ext4_exit_post_read_processing(void); 3553 3554 /* symlink.c */ 3555 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3556 extern const struct inode_operations ext4_symlink_inode_operations; 3557 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3558 3559 /* sysfs.c */ 3560 extern int ext4_register_sysfs(struct super_block *sb); 3561 extern void ext4_unregister_sysfs(struct super_block *sb); 3562 extern int __init ext4_init_sysfs(void); 3563 extern void ext4_exit_sysfs(void); 3564 3565 /* block_validity */ 3566 extern void ext4_release_system_zone(struct super_block *sb); 3567 extern int ext4_setup_system_zone(struct super_block *sb); 3568 extern int __init ext4_init_system_zone(void); 3569 extern void ext4_exit_system_zone(void); 3570 extern int ext4_inode_block_valid(struct inode *inode, 3571 ext4_fsblk_t start_blk, 3572 unsigned int count); 3573 extern int ext4_check_blockref(const char *, unsigned int, 3574 struct inode *, __le32 *, unsigned int); 3575 3576 /* extents.c */ 3577 struct ext4_ext_path; 3578 struct ext4_extent; 3579 3580 /* 3581 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3582 * __le32. 3583 */ 3584 #define EXT_MAX_BLOCKS 0xffffffff 3585 3586 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode); 3587 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3588 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3589 struct ext4_map_blocks *map, int flags); 3590 extern int ext4_ext_truncate(handle_t *, struct inode *); 3591 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3592 ext4_lblk_t end); 3593 extern void ext4_ext_init(struct super_block *); 3594 extern void ext4_ext_release(struct super_block *); 3595 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3596 loff_t len); 3597 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3598 loff_t offset, ssize_t len); 3599 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle, 3600 ext4_io_end_t *io_end); 3601 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3602 struct ext4_map_blocks *map, int flags); 3603 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3604 int num, 3605 struct ext4_ext_path *path); 3606 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3607 struct ext4_ext_path **, 3608 struct ext4_extent *, int); 3609 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3610 struct ext4_ext_path **, 3611 int flags); 3612 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 3613 extern int ext4_ext_check_inode(struct inode *inode); 3614 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3615 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3616 __u64 start, __u64 len); 3617 extern int ext4_get_es_cache(struct inode *inode, 3618 struct fiemap_extent_info *fieinfo, 3619 __u64 start, __u64 len); 3620 extern int ext4_ext_precache(struct inode *inode); 3621 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3622 struct inode *inode2, ext4_lblk_t lblk1, 3623 ext4_lblk_t lblk2, ext4_lblk_t count, 3624 int mark_unwritten,int *err); 3625 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu); 3626 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode, 3627 int check_cred, int restart_cred, 3628 int revoke_cred); 3629 extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end); 3630 extern int ext4_ext_replay_set_iblocks(struct inode *inode); 3631 extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start, 3632 int len, int unwritten, ext4_fsblk_t pblk); 3633 extern int ext4_ext_clear_bb(struct inode *inode); 3634 3635 3636 /* move_extent.c */ 3637 extern void ext4_double_down_write_data_sem(struct inode *first, 3638 struct inode *second); 3639 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3640 struct inode *donor_inode); 3641 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3642 __u64 start_orig, __u64 start_donor, 3643 __u64 len, __u64 *moved_len); 3644 3645 /* page-io.c */ 3646 extern int __init ext4_init_pageio(void); 3647 extern void ext4_exit_pageio(void); 3648 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3649 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3650 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3651 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3652 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3653 struct writeback_control *wbc); 3654 extern void ext4_end_io_rsv_work(struct work_struct *work); 3655 extern void ext4_io_submit(struct ext4_io_submit *io); 3656 extern int ext4_bio_write_page(struct ext4_io_submit *io, 3657 struct page *page, 3658 int len, 3659 bool keep_towrite); 3660 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end); 3661 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end); 3662 3663 /* mmp.c */ 3664 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3665 3666 /* verity.c */ 3667 extern const struct fsverity_operations ext4_verityops; 3668 3669 /* 3670 * Add new method to test whether block and inode bitmaps are properly 3671 * initialized. With uninit_bg reading the block from disk is not enough 3672 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3673 */ 3674 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3675 3676 static inline int bitmap_uptodate(struct buffer_head *bh) 3677 { 3678 return (buffer_uptodate(bh) && 3679 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3680 } 3681 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3682 { 3683 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3684 } 3685 3686 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3687 3688 /* For ioend & aio unwritten conversion wait queues */ 3689 #define EXT4_WQ_HASH_SZ 37 3690 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3691 EXT4_WQ_HASH_SZ]) 3692 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3693 3694 extern int ext4_resize_begin(struct super_block *sb); 3695 extern void ext4_resize_end(struct super_block *sb); 3696 3697 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 3698 struct ext4_io_end *io_end) 3699 { 3700 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 3701 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3702 atomic_inc(&EXT4_I(inode)->i_unwritten); 3703 } 3704 } 3705 3706 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3707 { 3708 struct inode *inode = io_end->inode; 3709 3710 if (io_end->flag & EXT4_IO_END_UNWRITTEN) { 3711 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3712 /* Wake up anyone waiting on unwritten extent conversion */ 3713 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) 3714 wake_up_all(ext4_ioend_wq(inode)); 3715 } 3716 } 3717 3718 extern const struct iomap_ops ext4_iomap_ops; 3719 extern const struct iomap_ops ext4_iomap_overwrite_ops; 3720 extern const struct iomap_ops ext4_iomap_report_ops; 3721 3722 static inline int ext4_buffer_uptodate(struct buffer_head *bh) 3723 { 3724 /* 3725 * If the buffer has the write error flag, we have failed 3726 * to write out data in the block. In this case, we don't 3727 * have to read the block because we may read the old data 3728 * successfully. 3729 */ 3730 if (!buffer_uptodate(bh) && buffer_write_io_error(bh)) 3731 set_buffer_uptodate(bh); 3732 return buffer_uptodate(bh); 3733 } 3734 3735 #endif /* __KERNEL__ */ 3736 3737 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3738 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3739 3740 #endif /* _EXT4_H */ 3741