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 /* data type for block offset of block group */ 102 typedef int ext4_grpblk_t; 103 104 /* data type for filesystem-wide blocks number */ 105 typedef unsigned long long ext4_fsblk_t; 106 107 /* data type for file logical block number */ 108 typedef __u32 ext4_lblk_t; 109 110 /* data type for block group number */ 111 typedef unsigned int ext4_group_t; 112 113 enum SHIFT_DIRECTION { 114 SHIFT_LEFT = 0, 115 SHIFT_RIGHT, 116 }; 117 118 /* 119 * Flags used in mballoc's allocation_context flags field. 120 * 121 * Also used to show what's going on for debugging purposes when the 122 * flag field is exported via the traceport interface 123 */ 124 125 /* prefer goal again. length */ 126 #define EXT4_MB_HINT_MERGE 0x0001 127 /* blocks already reserved */ 128 #define EXT4_MB_HINT_RESERVED 0x0002 129 /* metadata is being allocated */ 130 #define EXT4_MB_HINT_METADATA 0x0004 131 /* first blocks in the file */ 132 #define EXT4_MB_HINT_FIRST 0x0008 133 /* search for the best chunk */ 134 #define EXT4_MB_HINT_BEST 0x0010 135 /* data is being allocated */ 136 #define EXT4_MB_HINT_DATA 0x0020 137 /* don't preallocate (for tails) */ 138 #define EXT4_MB_HINT_NOPREALLOC 0x0040 139 /* allocate for locality group */ 140 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 141 /* allocate goal blocks or none */ 142 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 143 /* goal is meaningful */ 144 #define EXT4_MB_HINT_TRY_GOAL 0x0200 145 /* blocks already pre-reserved by delayed allocation */ 146 #define EXT4_MB_DELALLOC_RESERVED 0x0400 147 /* We are doing stream allocation */ 148 #define EXT4_MB_STREAM_ALLOC 0x0800 149 /* Use reserved root blocks if needed */ 150 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 151 /* Use blocks from reserved pool */ 152 #define EXT4_MB_USE_RESERVED 0x2000 153 /* Do strict check for free blocks while retrying block allocation */ 154 #define EXT4_MB_STRICT_CHECK 0x4000 155 156 struct ext4_allocation_request { 157 /* target inode for block we're allocating */ 158 struct inode *inode; 159 /* how many blocks we want to allocate */ 160 unsigned int len; 161 /* logical block in target inode */ 162 ext4_lblk_t logical; 163 /* the closest logical allocated block to the left */ 164 ext4_lblk_t lleft; 165 /* the closest logical allocated block to the right */ 166 ext4_lblk_t lright; 167 /* phys. target (a hint) */ 168 ext4_fsblk_t goal; 169 /* phys. block for the closest logical allocated block to the left */ 170 ext4_fsblk_t pleft; 171 /* phys. block for the closest logical allocated block to the right */ 172 ext4_fsblk_t pright; 173 /* flags. see above EXT4_MB_HINT_* */ 174 unsigned int flags; 175 }; 176 177 /* 178 * Logical to physical block mapping, used by ext4_map_blocks() 179 * 180 * This structure is used to pass requests into ext4_map_blocks() as 181 * well as to store the information returned by ext4_map_blocks(). It 182 * takes less room on the stack than a struct buffer_head. 183 */ 184 #define EXT4_MAP_NEW BIT(BH_New) 185 #define EXT4_MAP_MAPPED BIT(BH_Mapped) 186 #define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten) 187 #define EXT4_MAP_BOUNDARY BIT(BH_Boundary) 188 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 189 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 190 191 struct ext4_map_blocks { 192 ext4_fsblk_t m_pblk; 193 ext4_lblk_t m_lblk; 194 unsigned int m_len; 195 unsigned int m_flags; 196 }; 197 198 /* 199 * Block validity checking, system zone rbtree. 200 */ 201 struct ext4_system_blocks { 202 struct rb_root root; 203 struct rcu_head rcu; 204 }; 205 206 /* 207 * Flags for ext4_io_end->flags 208 */ 209 #define EXT4_IO_END_UNWRITTEN 0x0001 210 211 struct ext4_io_end_vec { 212 struct list_head list; /* list of io_end_vec */ 213 loff_t offset; /* offset in the file */ 214 ssize_t size; /* size of the extent */ 215 }; 216 217 /* 218 * For converting unwritten extents on a work queue. 'handle' is used for 219 * buffered writeback. 220 */ 221 typedef struct ext4_io_end { 222 struct list_head list; /* per-file finished IO list */ 223 handle_t *handle; /* handle reserved for extent 224 * conversion */ 225 struct inode *inode; /* file being written to */ 226 struct bio *bio; /* Linked list of completed 227 * bios covering the extent */ 228 unsigned int flag; /* unwritten or not */ 229 atomic_t count; /* reference counter */ 230 struct list_head list_vec; /* list of ext4_io_end_vec */ 231 } ext4_io_end_t; 232 233 struct ext4_io_submit { 234 struct writeback_control *io_wbc; 235 struct bio *io_bio; 236 ext4_io_end_t *io_end; 237 sector_t io_next_block; 238 }; 239 240 /* 241 * Special inodes numbers 242 */ 243 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 244 #define EXT4_ROOT_INO 2 /* Root inode */ 245 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 246 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 247 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 248 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 249 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 250 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 251 252 /* First non-reserved inode for old ext4 filesystems */ 253 #define EXT4_GOOD_OLD_FIRST_INO 11 254 255 /* 256 * Maximal count of links to a file 257 */ 258 #define EXT4_LINK_MAX 65000 259 260 /* 261 * Macro-instructions used to manage several block sizes 262 */ 263 #define EXT4_MIN_BLOCK_SIZE 1024 264 #define EXT4_MAX_BLOCK_SIZE 65536 265 #define EXT4_MIN_BLOCK_LOG_SIZE 10 266 #define EXT4_MAX_BLOCK_LOG_SIZE 16 267 #define EXT4_MAX_CLUSTER_LOG_SIZE 30 268 #ifdef __KERNEL__ 269 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 270 #else 271 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 272 #endif 273 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 274 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 275 EXT4_SB(s)->s_cluster_bits) 276 #ifdef __KERNEL__ 277 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 278 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 279 #else 280 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 281 #endif 282 #ifdef __KERNEL__ 283 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 284 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 285 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 286 #else 287 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 288 EXT4_GOOD_OLD_INODE_SIZE : \ 289 (s)->s_inode_size) 290 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 291 EXT4_GOOD_OLD_FIRST_INO : \ 292 (s)->s_first_ino) 293 #endif 294 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 295 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \ 296 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \ 297 blkbits)) 298 299 /* Translate a block number to a cluster number */ 300 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 301 /* Translate a cluster number to a block number */ 302 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 303 /* Translate # of blks to # of clusters */ 304 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 305 (sbi)->s_cluster_bits) 306 /* Mask out the low bits to get the starting block of the cluster */ 307 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 308 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 309 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 310 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 311 /* Fill in the low bits to get the last block of the cluster */ 312 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \ 313 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1)) 314 /* Get the cluster offset */ 315 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 316 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 317 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 318 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 319 320 /* 321 * Structure of a blocks group descriptor 322 */ 323 struct ext4_group_desc 324 { 325 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 326 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 327 __le32 bg_inode_table_lo; /* Inodes table block */ 328 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 329 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 330 __le16 bg_used_dirs_count_lo; /* Directories count */ 331 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 332 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 333 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 334 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 335 __le16 bg_itable_unused_lo; /* Unused inodes count */ 336 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 337 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 338 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 339 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 340 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 341 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 342 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 343 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 344 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 345 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 346 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 347 __u32 bg_reserved; 348 }; 349 350 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 351 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 352 sizeof(__le16)) 353 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 354 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 355 sizeof(__le16)) 356 357 /* 358 * Structure of a flex block group info 359 */ 360 361 struct flex_groups { 362 atomic64_t free_clusters; 363 atomic_t free_inodes; 364 atomic_t used_dirs; 365 }; 366 367 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 368 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 369 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 370 371 /* 372 * Macro-instructions used to manage group descriptors 373 */ 374 #define EXT4_MIN_DESC_SIZE 32 375 #define EXT4_MIN_DESC_SIZE_64BIT 64 376 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 377 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 378 #ifdef __KERNEL__ 379 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 380 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 381 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 382 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 383 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 384 #else 385 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 386 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 387 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 388 #endif 389 390 /* 391 * Constants relative to the data blocks 392 */ 393 #define EXT4_NDIR_BLOCKS 12 394 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 395 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 396 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 397 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 398 399 /* 400 * Inode flags 401 */ 402 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 403 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 404 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 405 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 406 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 407 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 408 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 409 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 410 /* Reserved for compression usage... */ 411 #define EXT4_DIRTY_FL 0x00000100 412 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 413 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 414 /* nb: was previously EXT2_ECOMPR_FL */ 415 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 416 /* End compression flags --- maybe not all used */ 417 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 418 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 419 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 420 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 421 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 422 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 423 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 424 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 425 #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */ 426 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 427 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */ 428 429 #define EXT4_DAX_FL 0x02000000 /* Inode is DAX */ 430 431 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 432 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 433 #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */ 434 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 435 436 /* User modifiable flags */ 437 #define EXT4_FL_USER_MODIFIABLE (EXT4_SECRM_FL | \ 438 EXT4_UNRM_FL | \ 439 EXT4_COMPR_FL | \ 440 EXT4_SYNC_FL | \ 441 EXT4_IMMUTABLE_FL | \ 442 EXT4_APPEND_FL | \ 443 EXT4_NODUMP_FL | \ 444 EXT4_NOATIME_FL | \ 445 EXT4_JOURNAL_DATA_FL | \ 446 EXT4_NOTAIL_FL | \ 447 EXT4_DIRSYNC_FL | \ 448 EXT4_TOPDIR_FL | \ 449 EXT4_EXTENTS_FL | \ 450 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \ 451 EXT4_DAX_FL | \ 452 EXT4_PROJINHERIT_FL | \ 453 EXT4_CASEFOLD_FL) 454 455 /* User visible flags */ 456 #define EXT4_FL_USER_VISIBLE (EXT4_FL_USER_MODIFIABLE | \ 457 EXT4_DIRTY_FL | \ 458 EXT4_COMPRBLK_FL | \ 459 EXT4_NOCOMPR_FL | \ 460 EXT4_ENCRYPT_FL | \ 461 EXT4_INDEX_FL | \ 462 EXT4_VERITY_FL | \ 463 EXT4_INLINE_DATA_FL) 464 465 /* Flags we can manipulate with through FS_IOC_FSSETXATTR */ 466 #define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \ 467 EXT4_IMMUTABLE_FL | \ 468 EXT4_APPEND_FL | \ 469 EXT4_NODUMP_FL | \ 470 EXT4_NOATIME_FL | \ 471 EXT4_PROJINHERIT_FL | \ 472 EXT4_DAX_FL) 473 474 /* Flags that should be inherited by new inodes from their parent. */ 475 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 476 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 477 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 478 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 479 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\ 480 EXT4_DAX_FL) 481 482 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 483 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\ 484 EXT4_PROJINHERIT_FL)) 485 486 /* Flags that are appropriate for non-directories/regular files. */ 487 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 488 489 /* The only flags that should be swapped */ 490 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL) 491 492 /* Flags which are mutually exclusive to DAX */ 493 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\ 494 EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL) 495 496 /* Mask out flags that are inappropriate for the given type of inode. */ 497 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 498 { 499 if (S_ISDIR(mode)) 500 return flags; 501 else if (S_ISREG(mode)) 502 return flags & EXT4_REG_FLMASK; 503 else 504 return flags & EXT4_OTHER_FLMASK; 505 } 506 507 /* 508 * Inode flags used for atomic set/get 509 */ 510 enum { 511 EXT4_INODE_SECRM = 0, /* Secure deletion */ 512 EXT4_INODE_UNRM = 1, /* Undelete */ 513 EXT4_INODE_COMPR = 2, /* Compress file */ 514 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 515 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 516 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 517 EXT4_INODE_NODUMP = 6, /* do not dump file */ 518 EXT4_INODE_NOATIME = 7, /* do not update atime */ 519 /* Reserved for compression usage... */ 520 EXT4_INODE_DIRTY = 8, 521 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 522 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 523 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 524 /* End compression flags --- maybe not all used */ 525 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 526 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 527 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 528 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 529 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 530 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 531 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 532 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 533 EXT4_INODE_VERITY = 20, /* Verity protected inode */ 534 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 535 /* 22 was formerly EXT4_INODE_EOFBLOCKS */ 536 EXT4_INODE_DAX = 25, /* Inode is DAX */ 537 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 538 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 539 EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */ 540 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 541 }; 542 543 /* 544 * Since it's pretty easy to mix up bit numbers and hex values, we use a 545 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 546 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 547 * any extra space in the compiled kernel image, otherwise, the build will fail. 548 * It's important that these values are the same, since we are using 549 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 550 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 551 * values found in ext2, ext3 and ext4 filesystems, and of course the values 552 * defined in e2fsprogs. 553 * 554 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 555 */ 556 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 557 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 558 559 static inline void ext4_check_flag_values(void) 560 { 561 CHECK_FLAG_VALUE(SECRM); 562 CHECK_FLAG_VALUE(UNRM); 563 CHECK_FLAG_VALUE(COMPR); 564 CHECK_FLAG_VALUE(SYNC); 565 CHECK_FLAG_VALUE(IMMUTABLE); 566 CHECK_FLAG_VALUE(APPEND); 567 CHECK_FLAG_VALUE(NODUMP); 568 CHECK_FLAG_VALUE(NOATIME); 569 CHECK_FLAG_VALUE(DIRTY); 570 CHECK_FLAG_VALUE(COMPRBLK); 571 CHECK_FLAG_VALUE(NOCOMPR); 572 CHECK_FLAG_VALUE(ENCRYPT); 573 CHECK_FLAG_VALUE(INDEX); 574 CHECK_FLAG_VALUE(IMAGIC); 575 CHECK_FLAG_VALUE(JOURNAL_DATA); 576 CHECK_FLAG_VALUE(NOTAIL); 577 CHECK_FLAG_VALUE(DIRSYNC); 578 CHECK_FLAG_VALUE(TOPDIR); 579 CHECK_FLAG_VALUE(HUGE_FILE); 580 CHECK_FLAG_VALUE(EXTENTS); 581 CHECK_FLAG_VALUE(VERITY); 582 CHECK_FLAG_VALUE(EA_INODE); 583 CHECK_FLAG_VALUE(INLINE_DATA); 584 CHECK_FLAG_VALUE(PROJINHERIT); 585 CHECK_FLAG_VALUE(CASEFOLD); 586 CHECK_FLAG_VALUE(RESERVED); 587 } 588 589 /* Used to pass group descriptor data when online resize is done */ 590 struct ext4_new_group_input { 591 __u32 group; /* Group number for this data */ 592 __u64 block_bitmap; /* Absolute block number of block bitmap */ 593 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 594 __u64 inode_table; /* Absolute block number of inode table start */ 595 __u32 blocks_count; /* Total number of blocks in this group */ 596 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 597 __u16 unused; 598 }; 599 600 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 601 struct compat_ext4_new_group_input { 602 u32 group; 603 compat_u64 block_bitmap; 604 compat_u64 inode_bitmap; 605 compat_u64 inode_table; 606 u32 blocks_count; 607 u16 reserved_blocks; 608 u16 unused; 609 }; 610 #endif 611 612 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 613 struct ext4_new_group_data { 614 __u32 group; 615 __u64 block_bitmap; 616 __u64 inode_bitmap; 617 __u64 inode_table; 618 __u32 blocks_count; 619 __u16 reserved_blocks; 620 __u16 mdata_blocks; 621 __u32 free_clusters_count; 622 }; 623 624 /* Indexes used to index group tables in ext4_new_group_data */ 625 enum { 626 BLOCK_BITMAP = 0, /* block bitmap */ 627 INODE_BITMAP, /* inode bitmap */ 628 INODE_TABLE, /* inode tables */ 629 GROUP_TABLE_COUNT, 630 }; 631 632 /* 633 * Flags used by ext4_map_blocks() 634 */ 635 /* Allocate any needed blocks and/or convert an unwritten 636 extent to be an initialized ext4 */ 637 #define EXT4_GET_BLOCKS_CREATE 0x0001 638 /* Request the creation of an unwritten extent */ 639 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 640 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 641 EXT4_GET_BLOCKS_CREATE) 642 /* Caller is from the delayed allocation writeout path 643 * finally doing the actual allocation of delayed blocks */ 644 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 645 /* caller is from the direct IO path, request to creation of an 646 unwritten extents if not allocated, split the unwritten 647 extent if blocks has been preallocated already*/ 648 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 649 #define EXT4_GET_BLOCKS_CONVERT 0x0010 650 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 651 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 652 /* Convert extent to initialized after IO complete */ 653 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 654 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 655 /* Eventual metadata allocation (due to growing extent tree) 656 * should not fail, so try to use reserved blocks for that.*/ 657 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 658 /* Don't normalize allocation size (used for fallocate) */ 659 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 660 /* Convert written extents to unwritten */ 661 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 662 /* Write zeros to newly created written extents */ 663 #define EXT4_GET_BLOCKS_ZERO 0x0200 664 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 665 EXT4_GET_BLOCKS_ZERO) 666 /* Caller will submit data before dropping transaction handle. This 667 * allows jbd2 to avoid submitting data before commit. */ 668 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 669 670 /* 671 * The bit position of these flags must not overlap with any of the 672 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 673 * read_extent_tree_block(), ext4_split_extent_at(), 674 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 675 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 676 * caching the extents when reading from the extent tree while a 677 * truncate or punch hole operation is in progress. 678 */ 679 #define EXT4_EX_NOCACHE 0x40000000 680 #define EXT4_EX_FORCE_CACHE 0x20000000 681 #define EXT4_EX_NOFAIL 0x10000000 682 683 /* 684 * Flags used by ext4_free_blocks 685 */ 686 #define EXT4_FREE_BLOCKS_METADATA 0x0001 687 #define EXT4_FREE_BLOCKS_FORGET 0x0002 688 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 689 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 690 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 691 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 692 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040 693 694 /* 695 * ioctl commands 696 */ 697 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 698 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 699 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 700 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 701 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 702 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 703 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 704 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 705 #define EXT4_IOC_MIGRATE _IO('f', 9) 706 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 707 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 708 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 709 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 710 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 711 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 712 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 713 /* ioctl codes 19--39 are reserved for fscrypt */ 714 #define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40) 715 #define EXT4_IOC_GETSTATE _IOW('f', 41, __u32) 716 #define EXT4_IOC_GET_ES_CACHE _IOWR('f', 42, struct fiemap) 717 718 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32) 719 720 /* 721 * Flags for going down operation 722 */ 723 #define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */ 724 #define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */ 725 #define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */ 726 727 /* 728 * Flags returned by EXT4_IOC_GETSTATE 729 * 730 * We only expose to userspace a subset of the state flags in 731 * i_state_flags 732 */ 733 #define EXT4_STATE_FLAG_EXT_PRECACHED 0x00000001 734 #define EXT4_STATE_FLAG_NEW 0x00000002 735 #define EXT4_STATE_FLAG_NEWENTRY 0x00000004 736 #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE 0x00000008 737 738 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 739 /* 740 * ioctl commands in 32 bit emulation 741 */ 742 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 743 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 744 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 745 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 746 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 747 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 748 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 749 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 750 #endif 751 752 /* 753 * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag. 754 * It indicates that the entry in extent status cache is for a hole. 755 */ 756 #define EXT4_FIEMAP_EXTENT_HOLE 0x08000000 757 758 /* Max physical block we can address w/o extents */ 759 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 760 761 /* Max logical block we can support */ 762 #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE 763 764 /* 765 * Structure of an inode on the disk 766 */ 767 struct ext4_inode { 768 __le16 i_mode; /* File mode */ 769 __le16 i_uid; /* Low 16 bits of Owner Uid */ 770 __le32 i_size_lo; /* Size in bytes */ 771 __le32 i_atime; /* Access time */ 772 __le32 i_ctime; /* Inode Change time */ 773 __le32 i_mtime; /* Modification time */ 774 __le32 i_dtime; /* Deletion Time */ 775 __le16 i_gid; /* Low 16 bits of Group Id */ 776 __le16 i_links_count; /* Links count */ 777 __le32 i_blocks_lo; /* Blocks count */ 778 __le32 i_flags; /* File flags */ 779 union { 780 struct { 781 __le32 l_i_version; 782 } linux1; 783 struct { 784 __u32 h_i_translator; 785 } hurd1; 786 struct { 787 __u32 m_i_reserved1; 788 } masix1; 789 } osd1; /* OS dependent 1 */ 790 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 791 __le32 i_generation; /* File version (for NFS) */ 792 __le32 i_file_acl_lo; /* File ACL */ 793 __le32 i_size_high; 794 __le32 i_obso_faddr; /* Obsoleted fragment address */ 795 union { 796 struct { 797 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 798 __le16 l_i_file_acl_high; 799 __le16 l_i_uid_high; /* these 2 fields */ 800 __le16 l_i_gid_high; /* were reserved2[0] */ 801 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 802 __le16 l_i_reserved; 803 } linux2; 804 struct { 805 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 806 __u16 h_i_mode_high; 807 __u16 h_i_uid_high; 808 __u16 h_i_gid_high; 809 __u32 h_i_author; 810 } hurd2; 811 struct { 812 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 813 __le16 m_i_file_acl_high; 814 __u32 m_i_reserved2[2]; 815 } masix2; 816 } osd2; /* OS dependent 2 */ 817 __le16 i_extra_isize; 818 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 819 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 820 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 821 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 822 __le32 i_crtime; /* File Creation time */ 823 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 824 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 825 __le32 i_projid; /* Project ID */ 826 }; 827 828 struct move_extent { 829 __u32 reserved; /* should be zero */ 830 __u32 donor_fd; /* donor file descriptor */ 831 __u64 orig_start; /* logical start offset in block for orig */ 832 __u64 donor_start; /* logical start offset in block for donor */ 833 __u64 len; /* block length to be moved */ 834 __u64 moved_len; /* moved block length */ 835 }; 836 837 #define EXT4_EPOCH_BITS 2 838 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 839 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 840 841 /* 842 * Extended fields will fit into an inode if the filesystem was formatted 843 * with large inodes (-I 256 or larger) and there are not currently any EAs 844 * consuming all of the available space. For new inodes we always reserve 845 * enough space for the kernel's known extended fields, but for inodes 846 * created with an old kernel this might not have been the case. None of 847 * the extended inode fields is critical for correct filesystem operation. 848 * This macro checks if a certain field fits in the inode. Note that 849 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 850 */ 851 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 852 ((offsetof(typeof(*ext4_inode), field) + \ 853 sizeof((ext4_inode)->field)) \ 854 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 855 (einode)->i_extra_isize)) \ 856 857 /* 858 * We use an encoding that preserves the times for extra epoch "00": 859 * 860 * extra msb of adjust for signed 861 * epoch 32-bit 32-bit tv_sec to 862 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 863 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 864 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 865 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 866 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 867 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 868 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 869 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 870 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 871 * 872 * Note that previous versions of the kernel on 64-bit systems would 873 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 874 * 1970. e2fsck will correct this, assuming that it is run on the 875 * affected filesystem before 2242. 876 */ 877 878 static inline __le32 ext4_encode_extra_time(struct timespec64 *time) 879 { 880 u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK; 881 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); 882 } 883 884 static inline void ext4_decode_extra_time(struct timespec64 *time, 885 __le32 extra) 886 { 887 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) 888 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 889 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 890 } 891 892 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 893 do { \ 894 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\ 895 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 896 (raw_inode)->xtime ## _extra = \ 897 ext4_encode_extra_time(&(inode)->xtime); \ 898 } \ 899 else \ 900 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX)); \ 901 } while (0) 902 903 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 904 do { \ 905 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 906 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 907 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 908 (raw_inode)->xtime ## _extra = \ 909 ext4_encode_extra_time(&(einode)->xtime); \ 910 } while (0) 911 912 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 913 do { \ 914 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 915 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \ 916 ext4_decode_extra_time(&(inode)->xtime, \ 917 raw_inode->xtime ## _extra); \ 918 } \ 919 else \ 920 (inode)->xtime.tv_nsec = 0; \ 921 } while (0) 922 923 924 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 925 do { \ 926 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 927 (einode)->xtime.tv_sec = \ 928 (signed)le32_to_cpu((raw_inode)->xtime); \ 929 else \ 930 (einode)->xtime.tv_sec = 0; \ 931 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 932 ext4_decode_extra_time(&(einode)->xtime, \ 933 raw_inode->xtime ## _extra); \ 934 else \ 935 (einode)->xtime.tv_nsec = 0; \ 936 } while (0) 937 938 #define i_disk_version osd1.linux1.l_i_version 939 940 #if defined(__KERNEL__) || defined(__linux__) 941 #define i_reserved1 osd1.linux1.l_i_reserved1 942 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 943 #define i_blocks_high osd2.linux2.l_i_blocks_high 944 #define i_uid_low i_uid 945 #define i_gid_low i_gid 946 #define i_uid_high osd2.linux2.l_i_uid_high 947 #define i_gid_high osd2.linux2.l_i_gid_high 948 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 949 950 #elif defined(__GNU__) 951 952 #define i_translator osd1.hurd1.h_i_translator 953 #define i_uid_high osd2.hurd2.h_i_uid_high 954 #define i_gid_high osd2.hurd2.h_i_gid_high 955 #define i_author osd2.hurd2.h_i_author 956 957 #elif defined(__masix__) 958 959 #define i_reserved1 osd1.masix1.m_i_reserved1 960 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 961 #define i_reserved2 osd2.masix2.m_i_reserved2 962 963 #endif /* defined(__KERNEL__) || defined(__linux__) */ 964 965 #include "extents_status.h" 966 #include "fast_commit.h" 967 968 /* 969 * Lock subclasses for i_data_sem in the ext4_inode_info structure. 970 * 971 * These are needed to avoid lockdep false positives when we need to 972 * allocate blocks to the quota inode during ext4_map_blocks(), while 973 * holding i_data_sem for a normal (non-quota) inode. Since we don't 974 * do quota tracking for the quota inode, this avoids deadlock (as 975 * well as infinite recursion, since it isn't turtles all the way 976 * down...) 977 * 978 * I_DATA_SEM_NORMAL - Used for most inodes 979 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode 980 * where the second inode has larger inode number 981 * than the first 982 * I_DATA_SEM_QUOTA - Used for quota inodes only 983 */ 984 enum { 985 I_DATA_SEM_NORMAL = 0, 986 I_DATA_SEM_OTHER, 987 I_DATA_SEM_QUOTA, 988 }; 989 990 991 /* 992 * fourth extended file system inode data in memory 993 */ 994 struct ext4_inode_info { 995 __le32 i_data[15]; /* unconverted */ 996 __u32 i_dtime; 997 ext4_fsblk_t i_file_acl; 998 999 /* 1000 * i_block_group is the number of the block group which contains 1001 * this file's inode. Constant across the lifetime of the inode, 1002 * it is used for making block allocation decisions - we try to 1003 * place a file's data blocks near its inode block, and new inodes 1004 * near to their parent directory's inode. 1005 */ 1006 ext4_group_t i_block_group; 1007 ext4_lblk_t i_dir_start_lookup; 1008 #if (BITS_PER_LONG < 64) 1009 unsigned long i_state_flags; /* Dynamic state flags */ 1010 #endif 1011 unsigned long i_flags; 1012 1013 /* 1014 * Extended attributes can be read independently of the main file 1015 * data. Taking i_mutex even when reading would cause contention 1016 * between readers of EAs and writers of regular file data, so 1017 * instead we synchronize on xattr_sem when reading or changing 1018 * EAs. 1019 */ 1020 struct rw_semaphore xattr_sem; 1021 1022 struct list_head i_orphan; /* unlinked but open inodes */ 1023 1024 /* Fast commit related info */ 1025 1026 struct list_head i_fc_list; /* 1027 * inodes that need fast commit 1028 * protected by sbi->s_fc_lock. 1029 */ 1030 1031 /* Fast commit subtid when this inode was committed */ 1032 unsigned int i_fc_committed_subtid; 1033 1034 /* Start of lblk range that needs to be committed in this fast commit */ 1035 ext4_lblk_t i_fc_lblk_start; 1036 1037 /* End of lblk range that needs to be committed in this fast commit */ 1038 ext4_lblk_t i_fc_lblk_len; 1039 1040 /* Number of ongoing updates on this inode */ 1041 atomic_t i_fc_updates; 1042 1043 /* Fast commit wait queue for this inode */ 1044 wait_queue_head_t i_fc_wait; 1045 1046 /* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */ 1047 struct mutex i_fc_lock; 1048 1049 /* 1050 * i_disksize keeps track of what the inode size is ON DISK, not 1051 * in memory. During truncate, i_size is set to the new size by 1052 * the VFS prior to calling ext4_truncate(), but the filesystem won't 1053 * set i_disksize to 0 until the truncate is actually under way. 1054 * 1055 * The intent is that i_disksize always represents the blocks which 1056 * are used by this file. This allows recovery to restart truncate 1057 * on orphans if we crash during truncate. We actually write i_disksize 1058 * into the on-disk inode when writing inodes out, instead of i_size. 1059 * 1060 * The only time when i_disksize and i_size may be different is when 1061 * a truncate is in progress. The only things which change i_disksize 1062 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 1063 */ 1064 loff_t i_disksize; 1065 1066 /* 1067 * i_data_sem is for serialising ext4_truncate() against 1068 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 1069 * data tree are chopped off during truncate. We can't do that in 1070 * ext4 because whenever we perform intermediate commits during 1071 * truncate, the inode and all the metadata blocks *must* be in a 1072 * consistent state which allows truncation of the orphans to restart 1073 * during recovery. Hence we must fix the get_block-vs-truncate race 1074 * by other means, so we have i_data_sem. 1075 */ 1076 struct rw_semaphore i_data_sem; 1077 /* 1078 * i_mmap_sem is for serializing page faults with truncate / punch hole 1079 * operations. We have to make sure that new page cannot be faulted in 1080 * a section of the inode that is being punched. We cannot easily use 1081 * i_data_sem for this since we need protection for the whole punch 1082 * operation and i_data_sem ranks below transaction start so we have 1083 * to occasionally drop it. 1084 */ 1085 struct rw_semaphore i_mmap_sem; 1086 struct inode vfs_inode; 1087 struct jbd2_inode *jinode; 1088 1089 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 1090 1091 /* 1092 * File creation time. Its function is same as that of 1093 * struct timespec64 i_{a,c,m}time in the generic inode. 1094 */ 1095 struct timespec64 i_crtime; 1096 1097 /* mballoc */ 1098 atomic_t i_prealloc_active; 1099 struct list_head i_prealloc_list; 1100 spinlock_t i_prealloc_lock; 1101 1102 /* extents status tree */ 1103 struct ext4_es_tree i_es_tree; 1104 rwlock_t i_es_lock; 1105 struct list_head i_es_list; 1106 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1107 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1108 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1109 extents to shrink. Protected by 1110 i_es_lock */ 1111 1112 /* ialloc */ 1113 ext4_group_t i_last_alloc_group; 1114 1115 /* allocation reservation info for delalloc */ 1116 /* In case of bigalloc, this refer to clusters rather than blocks */ 1117 unsigned int i_reserved_data_blocks; 1118 1119 /* pending cluster reservations for bigalloc file systems */ 1120 struct ext4_pending_tree i_pending_tree; 1121 1122 /* on-disk additional length */ 1123 __u16 i_extra_isize; 1124 1125 /* Indicate the inline data space. */ 1126 u16 i_inline_off; 1127 u16 i_inline_size; 1128 1129 #ifdef CONFIG_QUOTA 1130 /* quota space reservation, managed internally by quota code */ 1131 qsize_t i_reserved_quota; 1132 #endif 1133 1134 /* Lock protecting lists below */ 1135 spinlock_t i_completed_io_lock; 1136 /* 1137 * Completed IOs that need unwritten extents handling and have 1138 * transaction reserved 1139 */ 1140 struct list_head i_rsv_conversion_list; 1141 struct work_struct i_rsv_conversion_work; 1142 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 1143 1144 spinlock_t i_block_reservation_lock; 1145 1146 /* 1147 * Transactions that contain inode's metadata needed to complete 1148 * fsync and fdatasync, respectively. 1149 */ 1150 tid_t i_sync_tid; 1151 tid_t i_datasync_tid; 1152 1153 #ifdef CONFIG_QUOTA 1154 struct dquot *i_dquot[MAXQUOTAS]; 1155 #endif 1156 1157 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1158 __u32 i_csum_seed; 1159 1160 kprojid_t i_projid; 1161 }; 1162 1163 /* 1164 * File system states 1165 */ 1166 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1167 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1168 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1169 #define EXT4_FC_INELIGIBLE 0x0008 /* Fast commit ineligible */ 1170 #define EXT4_FC_COMMITTING 0x0010 /* File system underoing a fast 1171 * commit. 1172 */ 1173 #define EXT4_FC_REPLAY 0x0020 /* Fast commit replay ongoing */ 1174 1175 /* 1176 * Misc. filesystem flags 1177 */ 1178 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1179 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1180 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1181 1182 /* 1183 * Mount flags set via mount options or defaults 1184 */ 1185 #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */ 1186 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1187 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1188 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1189 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1190 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1191 #define EXT4_MOUNT_ERRORS_MASK 0x00070 1192 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1193 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1194 #ifdef CONFIG_FS_DAX 1195 #define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */ 1196 #else 1197 #define EXT4_MOUNT_DAX_ALWAYS 0 1198 #endif 1199 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1200 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1201 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1202 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1203 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1204 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1205 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1206 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1207 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1208 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1209 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */ 1210 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota, 1211 * enable enforcement for hidden 1212 * quota files */ 1213 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable 1214 * enforcement for hidden quota 1215 * files */ 1216 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota 1217 * enforcement */ 1218 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1219 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1220 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1221 #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */ 1222 #define EXT4_MOUNT_PREFETCH_BLOCK_BITMAPS 0x4000000 1223 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1224 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1225 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1226 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1227 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1228 1229 /* 1230 * Mount flags set either automatically (could not be set by mount option) 1231 * based on per file system feature or property or in special cases such as 1232 * distinguishing between explicit mount option definition and default. 1233 */ 1234 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1235 specified delalloc */ 1236 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1237 size of blocksize * 8 1238 blocks */ 1239 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1240 file systems */ 1241 #define EXT4_MOUNT2_DAX_NEVER 0x00000008 /* Do not allow Direct Access */ 1242 #define EXT4_MOUNT2_DAX_INODE 0x00000010 /* For printing options only */ 1243 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 1249 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1250 ~EXT4_MOUNT_##opt 1251 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1252 EXT4_MOUNT_##opt 1253 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1254 EXT4_MOUNT_##opt) 1255 1256 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1257 ~EXT4_MOUNT2_##opt 1258 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1259 EXT4_MOUNT2_##opt 1260 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1261 EXT4_MOUNT2_##opt) 1262 1263 #define ext4_test_and_set_bit __test_and_set_bit_le 1264 #define ext4_set_bit __set_bit_le 1265 #define ext4_set_bit_atomic ext2_set_bit_atomic 1266 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1267 #define ext4_clear_bit __clear_bit_le 1268 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1269 #define ext4_test_bit test_bit_le 1270 #define ext4_find_next_zero_bit find_next_zero_bit_le 1271 #define ext4_find_next_bit find_next_bit_le 1272 1273 extern void ext4_set_bits(void *bm, int cur, int len); 1274 1275 /* 1276 * Maximal mount counts between two filesystem checks 1277 */ 1278 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1279 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1280 1281 /* 1282 * Behaviour when detecting errors 1283 */ 1284 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1285 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1286 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1287 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1288 1289 /* Metadata checksum algorithm codes */ 1290 #define EXT4_CRC32C_CHKSUM 1 1291 1292 /* 1293 * Structure of the super block 1294 */ 1295 struct ext4_super_block { 1296 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1297 __le32 s_blocks_count_lo; /* Blocks count */ 1298 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1299 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1300 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1301 __le32 s_first_data_block; /* First Data Block */ 1302 __le32 s_log_block_size; /* Block size */ 1303 __le32 s_log_cluster_size; /* Allocation cluster size */ 1304 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1305 __le32 s_clusters_per_group; /* # Clusters per group */ 1306 __le32 s_inodes_per_group; /* # Inodes per group */ 1307 __le32 s_mtime; /* Mount time */ 1308 /*30*/ __le32 s_wtime; /* Write time */ 1309 __le16 s_mnt_count; /* Mount count */ 1310 __le16 s_max_mnt_count; /* Maximal mount count */ 1311 __le16 s_magic; /* Magic signature */ 1312 __le16 s_state; /* File system state */ 1313 __le16 s_errors; /* Behaviour when detecting errors */ 1314 __le16 s_minor_rev_level; /* minor revision level */ 1315 /*40*/ __le32 s_lastcheck; /* time of last check */ 1316 __le32 s_checkinterval; /* max. time between checks */ 1317 __le32 s_creator_os; /* OS */ 1318 __le32 s_rev_level; /* Revision level */ 1319 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1320 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1321 /* 1322 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1323 * 1324 * Note: the difference between the compatible feature set and 1325 * the incompatible feature set is that if there is a bit set 1326 * in the incompatible feature set that the kernel doesn't 1327 * know about, it should refuse to mount the filesystem. 1328 * 1329 * e2fsck's requirements are more strict; if it doesn't know 1330 * about a feature in either the compatible or incompatible 1331 * feature set, it must abort and not try to meddle with 1332 * things it doesn't understand... 1333 */ 1334 __le32 s_first_ino; /* First non-reserved inode */ 1335 __le16 s_inode_size; /* size of inode structure */ 1336 __le16 s_block_group_nr; /* block group # of this superblock */ 1337 __le32 s_feature_compat; /* compatible feature set */ 1338 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1339 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1340 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1341 /*78*/ char s_volume_name[16]; /* volume name */ 1342 /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */ 1343 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1344 /* 1345 * Performance hints. Directory preallocation should only 1346 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1347 */ 1348 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1349 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1350 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1351 /* 1352 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1353 */ 1354 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1355 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1356 __le32 s_journal_dev; /* device number of journal file */ 1357 __le32 s_last_orphan; /* start of list of inodes to delete */ 1358 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1359 __u8 s_def_hash_version; /* Default hash version to use */ 1360 __u8 s_jnl_backup_type; 1361 __le16 s_desc_size; /* size of group descriptor */ 1362 /*100*/ __le32 s_default_mount_opts; 1363 __le32 s_first_meta_bg; /* First metablock block group */ 1364 __le32 s_mkfs_time; /* When the filesystem was created */ 1365 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1366 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1367 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1368 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1369 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1370 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1371 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1372 __le32 s_flags; /* Miscellaneous flags */ 1373 __le16 s_raid_stride; /* RAID stride */ 1374 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1375 __le64 s_mmp_block; /* Block for multi-mount protection */ 1376 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1377 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1378 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1379 __u8 s_encryption_level; /* versioning level for encryption */ 1380 __u8 s_reserved_pad; /* Padding to next 32bits */ 1381 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1382 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1383 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1384 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1385 snapshot's future use */ 1386 __le32 s_snapshot_list; /* inode number of the head of the 1387 on-disk snapshot list */ 1388 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1389 __le32 s_error_count; /* number of fs errors */ 1390 __le32 s_first_error_time; /* first time an error happened */ 1391 __le32 s_first_error_ino; /* inode involved in first error */ 1392 __le64 s_first_error_block; /* block involved of first error */ 1393 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */ 1394 __le32 s_first_error_line; /* line number where error happened */ 1395 __le32 s_last_error_time; /* most recent time of an error */ 1396 __le32 s_last_error_ino; /* inode involved in last error */ 1397 __le32 s_last_error_line; /* line number where error happened */ 1398 __le64 s_last_error_block; /* block involved of last error */ 1399 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */ 1400 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1401 __u8 s_mount_opts[64]; 1402 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1403 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1404 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1405 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1406 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1407 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1408 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1409 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1410 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1411 __u8 s_wtime_hi; 1412 __u8 s_mtime_hi; 1413 __u8 s_mkfs_time_hi; 1414 __u8 s_lastcheck_hi; 1415 __u8 s_first_error_time_hi; 1416 __u8 s_last_error_time_hi; 1417 __u8 s_first_error_errcode; 1418 __u8 s_last_error_errcode; 1419 __le16 s_encoding; /* Filename charset encoding */ 1420 __le16 s_encoding_flags; /* Filename charset encoding flags */ 1421 __le32 s_reserved[95]; /* Padding to the end of the block */ 1422 __le32 s_checksum; /* crc32c(superblock) */ 1423 }; 1424 1425 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1426 1427 #ifdef __KERNEL__ 1428 1429 /* 1430 * run-time mount flags 1431 */ 1432 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1433 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1434 1435 #ifdef CONFIG_FS_ENCRYPTION 1436 #define DUMMY_ENCRYPTION_ENABLED(sbi) ((sbi)->s_dummy_enc_policy.policy != NULL) 1437 #else 1438 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0) 1439 #endif 1440 1441 /* Number of quota types we support */ 1442 #define EXT4_MAXQUOTAS 3 1443 1444 #define EXT4_ENC_UTF8_12_1 1 1445 1446 /* 1447 * Flags for ext4_sb_info.s_encoding_flags. 1448 */ 1449 #define EXT4_ENC_STRICT_MODE_FL (1 << 0) 1450 1451 #define ext4_has_strict_mode(sbi) \ 1452 (sbi->s_encoding_flags & EXT4_ENC_STRICT_MODE_FL) 1453 1454 /* 1455 * fourth extended-fs super-block data in memory 1456 */ 1457 struct ext4_sb_info { 1458 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1459 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1460 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1461 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1462 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1463 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1464 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1465 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1466 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1467 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1468 unsigned long s_overhead; /* # of fs overhead clusters */ 1469 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1470 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1471 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1472 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1473 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1474 struct buffer_head * __rcu *s_group_desc; 1475 unsigned int s_mount_opt; 1476 unsigned int s_mount_opt2; 1477 unsigned int s_mount_flags; 1478 unsigned int s_def_mount_opt; 1479 ext4_fsblk_t s_sb_block; 1480 atomic64_t s_resv_clusters; 1481 kuid_t s_resuid; 1482 kgid_t s_resgid; 1483 unsigned short s_mount_state; 1484 unsigned short s_pad; 1485 int s_addr_per_block_bits; 1486 int s_desc_per_block_bits; 1487 int s_inode_size; 1488 int s_first_ino; 1489 unsigned int s_inode_readahead_blks; 1490 unsigned int s_inode_goal; 1491 u32 s_hash_seed[4]; 1492 int s_def_hash_version; 1493 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1494 struct percpu_counter s_freeclusters_counter; 1495 struct percpu_counter s_freeinodes_counter; 1496 struct percpu_counter s_dirs_counter; 1497 struct percpu_counter s_dirtyclusters_counter; 1498 struct blockgroup_lock *s_blockgroup_lock; 1499 struct proc_dir_entry *s_proc; 1500 struct kobject s_kobj; 1501 struct completion s_kobj_unregister; 1502 struct super_block *s_sb; 1503 #ifdef CONFIG_UNICODE 1504 struct unicode_map *s_encoding; 1505 __u16 s_encoding_flags; 1506 #endif 1507 1508 /* Journaling */ 1509 struct journal_s *s_journal; 1510 struct list_head s_orphan; 1511 struct mutex s_orphan_lock; 1512 unsigned long s_ext4_flags; /* Ext4 superblock flags */ 1513 unsigned long s_commit_interval; 1514 u32 s_max_batch_time; 1515 u32 s_min_batch_time; 1516 struct block_device *s_journal_bdev; 1517 #ifdef CONFIG_QUOTA 1518 /* Names of quota files with journalled quota */ 1519 char __rcu *s_qf_names[EXT4_MAXQUOTAS]; 1520 int s_jquota_fmt; /* Format of quota to use */ 1521 #endif 1522 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1523 struct ext4_system_blocks __rcu *s_system_blks; 1524 1525 #ifdef EXTENTS_STATS 1526 /* ext4 extents stats */ 1527 unsigned long s_ext_min; 1528 unsigned long s_ext_max; 1529 unsigned long s_depth_max; 1530 spinlock_t s_ext_stats_lock; 1531 unsigned long s_ext_blocks; 1532 unsigned long s_ext_extents; 1533 #endif 1534 1535 /* for buddy allocator */ 1536 struct ext4_group_info ** __rcu *s_group_info; 1537 struct inode *s_buddy_cache; 1538 spinlock_t s_md_lock; 1539 unsigned short *s_mb_offsets; 1540 unsigned int *s_mb_maxs; 1541 unsigned int s_group_info_size; 1542 unsigned int s_mb_free_pending; 1543 struct list_head s_freed_data_list; /* List of blocks to be freed 1544 after commit completed */ 1545 1546 /* tunables */ 1547 unsigned long s_stripe; 1548 unsigned int s_mb_stream_request; 1549 unsigned int s_mb_max_to_scan; 1550 unsigned int s_mb_min_to_scan; 1551 unsigned int s_mb_stats; 1552 unsigned int s_mb_order2_reqs; 1553 unsigned int s_mb_group_prealloc; 1554 unsigned int s_mb_max_inode_prealloc; 1555 unsigned int s_max_dir_size_kb; 1556 /* where last allocation was done - for stream allocation */ 1557 unsigned long s_mb_last_group; 1558 unsigned long s_mb_last_start; 1559 unsigned int s_mb_prefetch; 1560 unsigned int s_mb_prefetch_limit; 1561 1562 /* stats for buddy allocator */ 1563 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1564 atomic_t s_bal_success; /* we found long enough chunks */ 1565 atomic_t s_bal_allocated; /* in blocks */ 1566 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1567 atomic_t s_bal_goals; /* goal hits */ 1568 atomic_t s_bal_breaks; /* too long searches */ 1569 atomic_t s_bal_2orders; /* 2^order hits */ 1570 spinlock_t s_bal_lock; 1571 unsigned long s_mb_buddies_generated; 1572 unsigned long long s_mb_generation_time; 1573 atomic_t s_mb_lost_chunks; 1574 atomic_t s_mb_preallocated; 1575 atomic_t s_mb_discarded; 1576 atomic_t s_lock_busy; 1577 1578 /* locality groups */ 1579 struct ext4_locality_group __percpu *s_locality_groups; 1580 1581 /* for write statistics */ 1582 unsigned long s_sectors_written_start; 1583 u64 s_kbytes_written; 1584 1585 /* the size of zero-out chunk */ 1586 unsigned int s_extent_max_zeroout_kb; 1587 1588 unsigned int s_log_groups_per_flex; 1589 struct flex_groups * __rcu *s_flex_groups; 1590 ext4_group_t s_flex_groups_allocated; 1591 1592 /* workqueue for reserved extent conversions (buffered io) */ 1593 struct workqueue_struct *rsv_conversion_wq; 1594 1595 /* timer for periodic error stats printing */ 1596 struct timer_list s_err_report; 1597 1598 /* Lazy inode table initialization info */ 1599 struct ext4_li_request *s_li_request; 1600 /* Wait multiplier for lazy initialization thread */ 1601 unsigned int s_li_wait_mult; 1602 1603 /* Kernel thread for multiple mount protection */ 1604 struct task_struct *s_mmp_tsk; 1605 1606 /* record the last minlen when FITRIM is called. */ 1607 atomic_t s_last_trim_minblks; 1608 1609 /* Reference to checksum algorithm driver via cryptoapi */ 1610 struct crypto_shash *s_chksum_driver; 1611 1612 /* Precomputed FS UUID checksum for seeding other checksums */ 1613 __u32 s_csum_seed; 1614 1615 /* Reclaim extents from extent status tree */ 1616 struct shrinker s_es_shrinker; 1617 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1618 long s_es_nr_inode; 1619 struct ext4_es_stats s_es_stats; 1620 struct mb_cache *s_ea_block_cache; 1621 struct mb_cache *s_ea_inode_cache; 1622 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1623 1624 /* Ratelimit ext4 messages. */ 1625 struct ratelimit_state s_err_ratelimit_state; 1626 struct ratelimit_state s_warning_ratelimit_state; 1627 struct ratelimit_state s_msg_ratelimit_state; 1628 atomic_t s_warning_count; 1629 atomic_t s_msg_count; 1630 1631 /* Encryption policy for '-o test_dummy_encryption' */ 1632 struct fscrypt_dummy_policy s_dummy_enc_policy; 1633 1634 /* 1635 * Barrier between writepages ops and changing any inode's JOURNAL_DATA 1636 * or EXTENTS flag. 1637 */ 1638 struct percpu_rw_semaphore s_writepages_rwsem; 1639 struct dax_device *s_daxdev; 1640 #ifdef CONFIG_EXT4_DEBUG 1641 unsigned long s_simulate_fail; 1642 #endif 1643 /* Record the errseq of the backing block device */ 1644 errseq_t s_bdev_wb_err; 1645 spinlock_t s_bdev_wb_lock; 1646 1647 /* Ext4 fast commit stuff */ 1648 atomic_t s_fc_subtid; 1649 atomic_t s_fc_ineligible_updates; 1650 /* 1651 * After commit starts, the main queue gets locked, and the further 1652 * updates get added in the staging queue. 1653 */ 1654 #define FC_Q_MAIN 0 1655 #define FC_Q_STAGING 1 1656 struct list_head s_fc_q[2]; /* Inodes staged for fast commit 1657 * that have data changes in them. 1658 */ 1659 struct list_head s_fc_dentry_q[2]; /* directory entry updates */ 1660 unsigned int s_fc_bytes; 1661 /* 1662 * Main fast commit lock. This lock protects accesses to the 1663 * following fields: 1664 * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh. 1665 */ 1666 spinlock_t s_fc_lock; 1667 struct buffer_head *s_fc_bh; 1668 struct ext4_fc_stats s_fc_stats; 1669 u64 s_fc_avg_commit_time; 1670 #ifdef CONFIG_EXT4_DEBUG 1671 int s_fc_debug_max_replay; 1672 #endif 1673 struct ext4_fc_replay_state s_fc_replay_state; 1674 }; 1675 1676 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1677 { 1678 return sb->s_fs_info; 1679 } 1680 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1681 { 1682 return container_of(inode, struct ext4_inode_info, vfs_inode); 1683 } 1684 1685 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1686 { 1687 return ino == EXT4_ROOT_INO || 1688 (ino >= EXT4_FIRST_INO(sb) && 1689 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1690 } 1691 1692 /* 1693 * Returns: sbi->field[index] 1694 * Used to access an array element from the following sbi fields which require 1695 * rcu protection to avoid dereferencing an invalid pointer due to reassignment 1696 * - s_group_desc 1697 * - s_group_info 1698 * - s_flex_group 1699 */ 1700 #define sbi_array_rcu_deref(sbi, field, index) \ 1701 ({ \ 1702 typeof(*((sbi)->field)) _v; \ 1703 rcu_read_lock(); \ 1704 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \ 1705 rcu_read_unlock(); \ 1706 _v; \ 1707 }) 1708 1709 /* 1710 * Simulate_fail codes 1711 */ 1712 #define EXT4_SIM_BBITMAP_EIO 1 1713 #define EXT4_SIM_BBITMAP_CRC 2 1714 #define EXT4_SIM_IBITMAP_EIO 3 1715 #define EXT4_SIM_IBITMAP_CRC 4 1716 #define EXT4_SIM_INODE_EIO 5 1717 #define EXT4_SIM_INODE_CRC 6 1718 #define EXT4_SIM_DIRBLOCK_EIO 7 1719 #define EXT4_SIM_DIRBLOCK_CRC 8 1720 1721 static inline bool ext4_simulate_fail(struct super_block *sb, 1722 unsigned long code) 1723 { 1724 #ifdef CONFIG_EXT4_DEBUG 1725 struct ext4_sb_info *sbi = EXT4_SB(sb); 1726 1727 if (unlikely(sbi->s_simulate_fail == code)) { 1728 sbi->s_simulate_fail = 0; 1729 return true; 1730 } 1731 #endif 1732 return false; 1733 } 1734 1735 static inline void ext4_simulate_fail_bh(struct super_block *sb, 1736 struct buffer_head *bh, 1737 unsigned long code) 1738 { 1739 if (!IS_ERR(bh) && ext4_simulate_fail(sb, code)) 1740 clear_buffer_uptodate(bh); 1741 } 1742 1743 /* 1744 * Error number codes for s_{first,last}_error_errno 1745 * 1746 * Linux errno numbers are architecture specific, so we need to translate 1747 * them into something which is architecture independent. We don't define 1748 * codes for all errno's; just the ones which are most likely to be the cause 1749 * of an ext4_error() call. 1750 */ 1751 #define EXT4_ERR_UNKNOWN 1 1752 #define EXT4_ERR_EIO 2 1753 #define EXT4_ERR_ENOMEM 3 1754 #define EXT4_ERR_EFSBADCRC 4 1755 #define EXT4_ERR_EFSCORRUPTED 5 1756 #define EXT4_ERR_ENOSPC 6 1757 #define EXT4_ERR_ENOKEY 7 1758 #define EXT4_ERR_EROFS 8 1759 #define EXT4_ERR_EFBIG 9 1760 #define EXT4_ERR_EEXIST 10 1761 #define EXT4_ERR_ERANGE 11 1762 #define EXT4_ERR_EOVERFLOW 12 1763 #define EXT4_ERR_EBUSY 13 1764 #define EXT4_ERR_ENOTDIR 14 1765 #define EXT4_ERR_ENOTEMPTY 15 1766 #define EXT4_ERR_ESHUTDOWN 16 1767 #define EXT4_ERR_EFAULT 17 1768 1769 /* 1770 * Inode dynamic state flags 1771 */ 1772 enum { 1773 EXT4_STATE_JDATA, /* journaled data exists */ 1774 EXT4_STATE_NEW, /* inode is newly created */ 1775 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1776 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1777 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1778 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1779 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1780 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1781 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1782 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */ 1783 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */ 1784 EXT4_STATE_FC_COMMITTING, /* Fast commit ongoing */ 1785 }; 1786 1787 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1788 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1789 { \ 1790 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1791 } \ 1792 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1793 { \ 1794 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1795 } \ 1796 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1797 { \ 1798 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1799 } 1800 1801 /* Add these declarations here only so that these functions can be 1802 * found by name. Otherwise, they are very hard to locate. */ 1803 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1804 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1805 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1806 EXT4_INODE_BIT_FNS(flag, flags, 0) 1807 1808 /* Add these declarations here only so that these functions can be 1809 * found by name. Otherwise, they are very hard to locate. */ 1810 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1811 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1812 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1813 #if (BITS_PER_LONG < 64) 1814 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1815 1816 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1817 { 1818 (ei)->i_state_flags = 0; 1819 } 1820 #else 1821 EXT4_INODE_BIT_FNS(state, flags, 32) 1822 1823 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1824 { 1825 /* We depend on the fact that callers will set i_flags */ 1826 } 1827 #endif 1828 #else 1829 /* Assume that user mode programs are passing in an ext4fs superblock, not 1830 * a kernel struct super_block. This will allow us to call the feature-test 1831 * macros from user land. */ 1832 #define EXT4_SB(sb) (sb) 1833 #endif 1834 1835 static inline bool ext4_verity_in_progress(struct inode *inode) 1836 { 1837 return IS_ENABLED(CONFIG_FS_VERITY) && 1838 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS); 1839 } 1840 1841 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1842 1843 /* 1844 * Codes for operating systems 1845 */ 1846 #define EXT4_OS_LINUX 0 1847 #define EXT4_OS_HURD 1 1848 #define EXT4_OS_MASIX 2 1849 #define EXT4_OS_FREEBSD 3 1850 #define EXT4_OS_LITES 4 1851 1852 /* 1853 * Revision levels 1854 */ 1855 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1856 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1857 1858 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1859 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1860 1861 #define EXT4_GOOD_OLD_INODE_SIZE 128 1862 1863 #define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN) 1864 #define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX 1865 #define EXT4_TIMESTAMP_MIN S32_MIN 1866 1867 /* 1868 * Feature set definitions 1869 */ 1870 1871 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1872 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1873 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1874 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1875 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1876 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1877 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1878 #define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400 1879 #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800 1880 1881 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1882 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1883 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1884 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1885 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1886 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1887 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1888 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1889 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1890 /* 1891 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1892 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1893 * all other data structures' checksums. However, the METADATA_CSUM and 1894 * GDT_CSUM bits are mutually exclusive. 1895 */ 1896 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1897 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1898 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 1899 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000 1900 1901 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1902 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1903 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1904 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1905 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1906 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1907 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1908 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1909 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1910 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1911 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1912 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 1913 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1914 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1915 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1916 #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000 1917 1918 extern void ext4_update_dynamic_rev(struct super_block *sb); 1919 1920 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 1921 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1922 { \ 1923 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1924 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 1925 } \ 1926 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1927 { \ 1928 ext4_update_dynamic_rev(sb); \ 1929 EXT4_SB(sb)->s_es->s_feature_compat |= \ 1930 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1931 } \ 1932 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1933 { \ 1934 EXT4_SB(sb)->s_es->s_feature_compat &= \ 1935 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1936 } 1937 1938 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 1939 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1940 { \ 1941 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1942 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 1943 } \ 1944 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1945 { \ 1946 ext4_update_dynamic_rev(sb); \ 1947 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 1948 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1949 } \ 1950 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1951 { \ 1952 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 1953 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1954 } 1955 1956 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 1957 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1958 { \ 1959 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1960 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 1961 } \ 1962 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1963 { \ 1964 ext4_update_dynamic_rev(sb); \ 1965 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 1966 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1967 } \ 1968 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1969 { \ 1970 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 1971 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1972 } 1973 1974 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 1975 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 1976 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 1977 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 1978 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 1979 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 1980 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 1981 EXT4_FEATURE_COMPAT_FUNCS(fast_commit, FAST_COMMIT) 1982 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES) 1983 1984 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 1985 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 1986 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 1987 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 1988 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 1989 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 1990 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 1991 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 1992 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 1993 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 1994 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 1995 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 1996 EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY) 1997 1998 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 1999 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 2000 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 2001 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 2002 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 2003 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 2004 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 2005 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 2006 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 2007 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 2008 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 2009 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 2010 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 2011 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 2012 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 2013 EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD) 2014 2015 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2016 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2017 EXT4_FEATURE_INCOMPAT_META_BG) 2018 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2019 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2020 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 2021 2022 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2023 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2024 EXT4_FEATURE_INCOMPAT_RECOVER| \ 2025 EXT4_FEATURE_INCOMPAT_META_BG) 2026 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2027 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2028 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 2029 2030 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2031 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2032 EXT4_FEATURE_INCOMPAT_RECOVER| \ 2033 EXT4_FEATURE_INCOMPAT_META_BG| \ 2034 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 2035 EXT4_FEATURE_INCOMPAT_64BIT| \ 2036 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 2037 EXT4_FEATURE_INCOMPAT_EA_INODE| \ 2038 EXT4_FEATURE_INCOMPAT_MMP | \ 2039 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 2040 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 2041 EXT4_FEATURE_INCOMPAT_CASEFOLD | \ 2042 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \ 2043 EXT4_FEATURE_INCOMPAT_LARGEDIR) 2044 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2045 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2046 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 2047 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 2048 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 2049 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 2050 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 2051 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 2052 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 2053 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 2054 EXT4_FEATURE_RO_COMPAT_PROJECT |\ 2055 EXT4_FEATURE_RO_COMPAT_VERITY) 2056 2057 #define EXTN_FEATURE_FUNCS(ver) \ 2058 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 2059 { \ 2060 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 2061 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 2062 } \ 2063 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 2064 { \ 2065 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 2066 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 2067 } \ 2068 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 2069 { \ 2070 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 2071 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 2072 } 2073 2074 EXTN_FEATURE_FUNCS(2) 2075 EXTN_FEATURE_FUNCS(3) 2076 EXTN_FEATURE_FUNCS(4) 2077 2078 static inline bool ext4_has_compat_features(struct super_block *sb) 2079 { 2080 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 2081 } 2082 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 2083 { 2084 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 2085 } 2086 static inline bool ext4_has_incompat_features(struct super_block *sb) 2087 { 2088 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 2089 } 2090 2091 /* 2092 * Superblock flags 2093 */ 2094 #define EXT4_FLAGS_RESIZING 0 2095 #define EXT4_FLAGS_SHUTDOWN 1 2096 #define EXT4_FLAGS_BDEV_IS_DAX 2 2097 2098 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi) 2099 { 2100 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 2101 } 2102 2103 2104 /* 2105 * Default values for user and/or group using reserved blocks 2106 */ 2107 #define EXT4_DEF_RESUID 0 2108 #define EXT4_DEF_RESGID 0 2109 2110 /* 2111 * Default project ID 2112 */ 2113 #define EXT4_DEF_PROJID 0 2114 2115 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 2116 2117 /* 2118 * Default mount options 2119 */ 2120 #define EXT4_DEFM_DEBUG 0x0001 2121 #define EXT4_DEFM_BSDGROUPS 0x0002 2122 #define EXT4_DEFM_XATTR_USER 0x0004 2123 #define EXT4_DEFM_ACL 0x0008 2124 #define EXT4_DEFM_UID16 0x0010 2125 #define EXT4_DEFM_JMODE 0x0060 2126 #define EXT4_DEFM_JMODE_DATA 0x0020 2127 #define EXT4_DEFM_JMODE_ORDERED 0x0040 2128 #define EXT4_DEFM_JMODE_WBACK 0x0060 2129 #define EXT4_DEFM_NOBARRIER 0x0100 2130 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 2131 #define EXT4_DEFM_DISCARD 0x0400 2132 #define EXT4_DEFM_NODELALLOC 0x0800 2133 2134 /* 2135 * Default journal batch times 2136 */ 2137 #define EXT4_DEF_MIN_BATCH_TIME 0 2138 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 2139 2140 /* 2141 * Minimum number of groups in a flexgroup before we separate out 2142 * directories into the first block group of a flexgroup 2143 */ 2144 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 2145 2146 /* 2147 * Structure of a directory entry 2148 */ 2149 #define EXT4_NAME_LEN 255 2150 2151 struct ext4_dir_entry { 2152 __le32 inode; /* Inode number */ 2153 __le16 rec_len; /* Directory entry length */ 2154 __le16 name_len; /* Name length */ 2155 char name[EXT4_NAME_LEN]; /* File name */ 2156 }; 2157 2158 /* 2159 * The new version of the directory entry. Since EXT4 structures are 2160 * stored in intel byte order, and the name_len field could never be 2161 * bigger than 255 chars, it's safe to reclaim the extra byte for the 2162 * file_type field. 2163 */ 2164 struct ext4_dir_entry_2 { 2165 __le32 inode; /* Inode number */ 2166 __le16 rec_len; /* Directory entry length */ 2167 __u8 name_len; /* Name length */ 2168 __u8 file_type; /* See file type macros EXT4_FT_* below */ 2169 char name[EXT4_NAME_LEN]; /* File name */ 2170 }; 2171 2172 /* 2173 * This is a bogus directory entry at the end of each leaf block that 2174 * records checksums. 2175 */ 2176 struct ext4_dir_entry_tail { 2177 __le32 det_reserved_zero1; /* Pretend to be unused */ 2178 __le16 det_rec_len; /* 12 */ 2179 __u8 det_reserved_zero2; /* Zero name length */ 2180 __u8 det_reserved_ft; /* 0xDE, fake file type */ 2181 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 2182 }; 2183 2184 #define EXT4_DIRENT_TAIL(block, blocksize) \ 2185 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 2186 ((blocksize) - \ 2187 sizeof(struct ext4_dir_entry_tail)))) 2188 2189 /* 2190 * Ext4 directory file types. Only the low 3 bits are used. The 2191 * other bits are reserved for now. 2192 */ 2193 #define EXT4_FT_UNKNOWN 0 2194 #define EXT4_FT_REG_FILE 1 2195 #define EXT4_FT_DIR 2 2196 #define EXT4_FT_CHRDEV 3 2197 #define EXT4_FT_BLKDEV 4 2198 #define EXT4_FT_FIFO 5 2199 #define EXT4_FT_SOCK 6 2200 #define EXT4_FT_SYMLINK 7 2201 2202 #define EXT4_FT_MAX 8 2203 2204 #define EXT4_FT_DIR_CSUM 0xDE 2205 2206 /* 2207 * EXT4_DIR_PAD defines the directory entries boundaries 2208 * 2209 * NOTE: It must be a multiple of 4 2210 */ 2211 #define EXT4_DIR_PAD 4 2212 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 2213 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 2214 ~EXT4_DIR_ROUND) 2215 #define EXT4_MAX_REC_LEN ((1<<16)-1) 2216 2217 /* 2218 * If we ever get support for fs block sizes > page_size, we'll need 2219 * to remove the #if statements in the next two functions... 2220 */ 2221 static inline unsigned int 2222 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 2223 { 2224 unsigned len = le16_to_cpu(dlen); 2225 2226 #if (PAGE_SIZE >= 65536) 2227 if (len == EXT4_MAX_REC_LEN || len == 0) 2228 return blocksize; 2229 return (len & 65532) | ((len & 3) << 16); 2230 #else 2231 return len; 2232 #endif 2233 } 2234 2235 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 2236 { 2237 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 2238 BUG(); 2239 #if (PAGE_SIZE >= 65536) 2240 if (len < 65536) 2241 return cpu_to_le16(len); 2242 if (len == blocksize) { 2243 if (blocksize == 65536) 2244 return cpu_to_le16(EXT4_MAX_REC_LEN); 2245 else 2246 return cpu_to_le16(0); 2247 } 2248 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 2249 #else 2250 return cpu_to_le16(len); 2251 #endif 2252 } 2253 2254 /* 2255 * Hash Tree Directory indexing 2256 * (c) Daniel Phillips, 2001 2257 */ 2258 2259 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2260 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2261 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \ 2262 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir))) 2263 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2264 2265 /* Legal values for the dx_root hash_version field: */ 2266 2267 #define DX_HASH_LEGACY 0 2268 #define DX_HASH_HALF_MD4 1 2269 #define DX_HASH_TEA 2 2270 #define DX_HASH_LEGACY_UNSIGNED 3 2271 #define DX_HASH_HALF_MD4_UNSIGNED 4 2272 #define DX_HASH_TEA_UNSIGNED 5 2273 2274 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 2275 const void *address, unsigned int length) 2276 { 2277 struct { 2278 struct shash_desc shash; 2279 char ctx[4]; 2280 } desc; 2281 2282 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2283 2284 desc.shash.tfm = sbi->s_chksum_driver; 2285 *(u32 *)desc.ctx = crc; 2286 2287 BUG_ON(crypto_shash_update(&desc.shash, address, length)); 2288 2289 return *(u32 *)desc.ctx; 2290 } 2291 2292 #ifdef __KERNEL__ 2293 2294 /* hash info structure used by the directory hash */ 2295 struct dx_hash_info 2296 { 2297 u32 hash; 2298 u32 minor_hash; 2299 int hash_version; 2300 u32 *seed; 2301 }; 2302 2303 2304 /* 32 and 64 bit signed EOF for dx directories */ 2305 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2306 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2307 2308 2309 /* 2310 * Control parameters used by ext4_htree_next_block 2311 */ 2312 #define HASH_NB_ALWAYS 1 2313 2314 struct ext4_filename { 2315 const struct qstr *usr_fname; 2316 struct fscrypt_str disk_name; 2317 struct dx_hash_info hinfo; 2318 #ifdef CONFIG_FS_ENCRYPTION 2319 struct fscrypt_str crypto_buf; 2320 #endif 2321 #ifdef CONFIG_UNICODE 2322 struct fscrypt_str cf_name; 2323 #endif 2324 }; 2325 2326 #define fname_name(p) ((p)->disk_name.name) 2327 #define fname_len(p) ((p)->disk_name.len) 2328 2329 /* 2330 * Describe an inode's exact location on disk and in memory 2331 */ 2332 struct ext4_iloc 2333 { 2334 struct buffer_head *bh; 2335 unsigned long offset; 2336 ext4_group_t block_group; 2337 }; 2338 2339 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2340 { 2341 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2342 } 2343 2344 static inline bool ext4_is_quota_file(struct inode *inode) 2345 { 2346 return IS_NOQUOTA(inode) && 2347 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL); 2348 } 2349 2350 /* 2351 * This structure is stuffed into the struct file's private_data field 2352 * for directories. It is where we put information so that we can do 2353 * readdir operations in hash tree order. 2354 */ 2355 struct dir_private_info { 2356 struct rb_root root; 2357 struct rb_node *curr_node; 2358 struct fname *extra_fname; 2359 loff_t last_pos; 2360 __u32 curr_hash; 2361 __u32 curr_minor_hash; 2362 __u32 next_hash; 2363 }; 2364 2365 /* calculate the first block number of the group */ 2366 static inline ext4_fsblk_t 2367 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2368 { 2369 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2370 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2371 } 2372 2373 /* 2374 * Special error return code only used by dx_probe() and its callers. 2375 */ 2376 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2377 2378 /* htree levels for ext4 */ 2379 #define EXT4_HTREE_LEVEL_COMPAT 2 2380 #define EXT4_HTREE_LEVEL 3 2381 2382 static inline int ext4_dir_htree_level(struct super_block *sb) 2383 { 2384 return ext4_has_feature_largedir(sb) ? 2385 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT; 2386 } 2387 2388 /* 2389 * Timeout and state flag for lazy initialization inode thread. 2390 */ 2391 #define EXT4_DEF_LI_WAIT_MULT 10 2392 #define EXT4_DEF_LI_MAX_START_DELAY 5 2393 #define EXT4_LAZYINIT_QUIT 0x0001 2394 #define EXT4_LAZYINIT_RUNNING 0x0002 2395 2396 /* 2397 * Lazy inode table initialization info 2398 */ 2399 struct ext4_lazy_init { 2400 unsigned long li_state; 2401 struct list_head li_request_list; 2402 struct mutex li_list_mtx; 2403 }; 2404 2405 enum ext4_li_mode { 2406 EXT4_LI_MODE_PREFETCH_BBITMAP, 2407 EXT4_LI_MODE_ITABLE, 2408 }; 2409 2410 struct ext4_li_request { 2411 struct super_block *lr_super; 2412 enum ext4_li_mode lr_mode; 2413 ext4_group_t lr_first_not_zeroed; 2414 ext4_group_t lr_next_group; 2415 struct list_head lr_request; 2416 unsigned long lr_next_sched; 2417 unsigned long lr_timeout; 2418 }; 2419 2420 struct ext4_features { 2421 struct kobject f_kobj; 2422 struct completion f_kobj_unregister; 2423 }; 2424 2425 /* 2426 * This structure will be used for multiple mount protection. It will be 2427 * written into the block number saved in the s_mmp_block field in the 2428 * superblock. Programs that check MMP should assume that if 2429 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2430 * to use the filesystem, regardless of how old the timestamp is. 2431 */ 2432 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2433 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2434 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2435 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2436 2437 struct mmp_struct { 2438 __le32 mmp_magic; /* Magic number for MMP */ 2439 __le32 mmp_seq; /* Sequence no. updated periodically */ 2440 2441 /* 2442 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2443 * purposes and do not affect the correctness of the algorithm 2444 */ 2445 __le64 mmp_time; /* Time last updated */ 2446 char mmp_nodename[64]; /* Node which last updated MMP block */ 2447 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2448 2449 /* 2450 * mmp_check_interval is used to verify if the MMP block has been 2451 * updated on the block device. The value is updated based on the 2452 * maximum time to write the MMP block during an update cycle. 2453 */ 2454 __le16 mmp_check_interval; 2455 2456 __le16 mmp_pad1; 2457 __le32 mmp_pad2[226]; 2458 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2459 }; 2460 2461 /* arguments passed to the mmp thread */ 2462 struct mmpd_data { 2463 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2464 struct super_block *sb; /* super block of the fs */ 2465 }; 2466 2467 /* 2468 * Check interval multiplier 2469 * The MMP block is written every update interval and initially checked every 2470 * update interval x the multiplier (the value is then adapted based on the 2471 * write latency). The reason is that writes can be delayed under load and we 2472 * don't want readers to incorrectly assume that the filesystem is no longer 2473 * in use. 2474 */ 2475 #define EXT4_MMP_CHECK_MULT 2UL 2476 2477 /* 2478 * Minimum interval for MMP checking in seconds. 2479 */ 2480 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2481 2482 /* 2483 * Maximum interval for MMP checking in seconds. 2484 */ 2485 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2486 2487 /* 2488 * Function prototypes 2489 */ 2490 2491 /* 2492 * Ok, these declarations are also in <linux/kernel.h> but none of the 2493 * ext4 source programs needs to include it so they are duplicated here. 2494 */ 2495 # define NORET_TYPE /**/ 2496 # define ATTRIB_NORET __attribute__((noreturn)) 2497 # define NORET_AND noreturn, 2498 2499 /* bitmap.c */ 2500 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2501 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2502 struct ext4_group_desc *gdp, 2503 struct buffer_head *bh, int sz); 2504 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2505 struct ext4_group_desc *gdp, 2506 struct buffer_head *bh, int sz); 2507 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2508 struct ext4_group_desc *gdp, 2509 struct buffer_head *bh); 2510 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2511 struct ext4_group_desc *gdp, 2512 struct buffer_head *bh); 2513 2514 /* balloc.c */ 2515 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2516 ext4_fsblk_t blocknr, 2517 ext4_group_t *blockgrpp, 2518 ext4_grpblk_t *offsetp); 2519 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2520 ext4_fsblk_t block); 2521 2522 extern unsigned int ext4_block_group(struct super_block *sb, 2523 ext4_fsblk_t blocknr); 2524 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2525 ext4_fsblk_t blocknr); 2526 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2527 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2528 ext4_group_t group); 2529 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2530 ext4_fsblk_t goal, 2531 unsigned int flags, 2532 unsigned long *count, 2533 int *errp); 2534 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2535 s64 nclusters, unsigned int flags); 2536 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2537 extern void ext4_check_blocks_bitmap(struct super_block *); 2538 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2539 ext4_group_t block_group, 2540 struct buffer_head ** bh); 2541 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2542 2543 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2544 ext4_group_t block_group, 2545 bool ignore_locked); 2546 extern int ext4_wait_block_bitmap(struct super_block *sb, 2547 ext4_group_t block_group, 2548 struct buffer_head *bh); 2549 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2550 ext4_group_t block_group); 2551 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2552 ext4_group_t block_group, 2553 struct ext4_group_desc *gdp); 2554 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2555 2556 #ifdef CONFIG_UNICODE 2557 extern void ext4_fname_setup_ci_filename(struct inode *dir, 2558 const struct qstr *iname, 2559 struct fscrypt_str *fname); 2560 #endif 2561 2562 #ifdef CONFIG_FS_ENCRYPTION 2563 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst, 2564 const struct fscrypt_name *src) 2565 { 2566 memset(dst, 0, sizeof(*dst)); 2567 2568 dst->usr_fname = src->usr_fname; 2569 dst->disk_name = src->disk_name; 2570 dst->hinfo.hash = src->hash; 2571 dst->hinfo.minor_hash = src->minor_hash; 2572 dst->crypto_buf = src->crypto_buf; 2573 } 2574 2575 static inline int ext4_fname_setup_filename(struct inode *dir, 2576 const struct qstr *iname, 2577 int lookup, 2578 struct ext4_filename *fname) 2579 { 2580 struct fscrypt_name name; 2581 int err; 2582 2583 err = fscrypt_setup_filename(dir, iname, lookup, &name); 2584 if (err) 2585 return err; 2586 2587 ext4_fname_from_fscrypt_name(fname, &name); 2588 2589 #ifdef CONFIG_UNICODE 2590 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name); 2591 #endif 2592 return 0; 2593 } 2594 2595 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2596 struct dentry *dentry, 2597 struct ext4_filename *fname) 2598 { 2599 struct fscrypt_name name; 2600 int err; 2601 2602 err = fscrypt_prepare_lookup(dir, dentry, &name); 2603 if (err) 2604 return err; 2605 2606 ext4_fname_from_fscrypt_name(fname, &name); 2607 2608 #ifdef CONFIG_UNICODE 2609 ext4_fname_setup_ci_filename(dir, &dentry->d_name, &fname->cf_name); 2610 #endif 2611 return 0; 2612 } 2613 2614 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2615 { 2616 struct fscrypt_name name; 2617 2618 name.crypto_buf = fname->crypto_buf; 2619 fscrypt_free_filename(&name); 2620 2621 fname->crypto_buf.name = NULL; 2622 fname->usr_fname = NULL; 2623 fname->disk_name.name = NULL; 2624 2625 #ifdef CONFIG_UNICODE 2626 kfree(fname->cf_name.name); 2627 fname->cf_name.name = NULL; 2628 #endif 2629 } 2630 #else /* !CONFIG_FS_ENCRYPTION */ 2631 static inline int ext4_fname_setup_filename(struct inode *dir, 2632 const struct qstr *iname, 2633 int lookup, 2634 struct ext4_filename *fname) 2635 { 2636 fname->usr_fname = iname; 2637 fname->disk_name.name = (unsigned char *) iname->name; 2638 fname->disk_name.len = iname->len; 2639 2640 #ifdef CONFIG_UNICODE 2641 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name); 2642 #endif 2643 2644 return 0; 2645 } 2646 2647 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2648 struct dentry *dentry, 2649 struct ext4_filename *fname) 2650 { 2651 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname); 2652 } 2653 2654 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2655 { 2656 #ifdef CONFIG_UNICODE 2657 kfree(fname->cf_name.name); 2658 fname->cf_name.name = NULL; 2659 #endif 2660 } 2661 #endif /* !CONFIG_FS_ENCRYPTION */ 2662 2663 /* dir.c */ 2664 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2665 struct file *, 2666 struct ext4_dir_entry_2 *, 2667 struct buffer_head *, char *, int, 2668 unsigned int); 2669 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2670 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2671 (de), (bh), (buf), (size), (offset))) 2672 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2673 __u32 minor_hash, 2674 struct ext4_dir_entry_2 *dirent, 2675 struct fscrypt_str *ent_name); 2676 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2677 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2678 struct buffer_head *bh, 2679 void *buf, int buf_size, 2680 struct ext4_filename *fname, 2681 struct ext4_dir_entry_2 **dest_de); 2682 void ext4_insert_dentry(struct inode *inode, 2683 struct ext4_dir_entry_2 *de, 2684 int buf_size, 2685 struct ext4_filename *fname); 2686 static inline void ext4_update_dx_flag(struct inode *inode) 2687 { 2688 if (!ext4_has_feature_dir_index(inode->i_sb)) { 2689 /* ext4_iget() should have caught this... */ 2690 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb)); 2691 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2692 } 2693 } 2694 static const unsigned char ext4_filetype_table[] = { 2695 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2696 }; 2697 2698 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2699 { 2700 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2701 return DT_UNKNOWN; 2702 2703 return ext4_filetype_table[filetype]; 2704 } 2705 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2706 void *buf, int buf_size); 2707 2708 /* fsync.c */ 2709 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2710 2711 /* hash.c */ 2712 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len, 2713 struct dx_hash_info *hinfo); 2714 2715 /* ialloc.c */ 2716 extern int ext4_mark_inode_used(struct super_block *sb, int ino); 2717 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2718 const struct qstr *qstr, __u32 goal, 2719 uid_t *owner, __u32 i_flags, 2720 int handle_type, unsigned int line_no, 2721 int nblocks); 2722 2723 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \ 2724 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2725 i_flags, 0, 0, 0) 2726 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2727 type, nblocks) \ 2728 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2729 0, (type), __LINE__, (nblocks)) 2730 2731 2732 extern void ext4_free_inode(handle_t *, struct inode *); 2733 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2734 extern unsigned long ext4_count_free_inodes(struct super_block *); 2735 extern unsigned long ext4_count_dirs(struct super_block *); 2736 extern void ext4_check_inodes_bitmap(struct super_block *); 2737 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2738 extern int ext4_init_inode_table(struct super_block *sb, 2739 ext4_group_t group, int barrier); 2740 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2741 2742 /* fast_commit.c */ 2743 int ext4_fc_info_show(struct seq_file *seq, void *v); 2744 void ext4_fc_init(struct super_block *sb, journal_t *journal); 2745 void ext4_fc_init_inode(struct inode *inode); 2746 void ext4_fc_track_range(struct inode *inode, ext4_lblk_t start, 2747 ext4_lblk_t end); 2748 void ext4_fc_track_unlink(struct inode *inode, struct dentry *dentry); 2749 void ext4_fc_track_link(struct inode *inode, struct dentry *dentry); 2750 void ext4_fc_track_create(struct inode *inode, struct dentry *dentry); 2751 void ext4_fc_track_inode(struct inode *inode); 2752 void ext4_fc_mark_ineligible(struct super_block *sb, int reason); 2753 void ext4_fc_start_ineligible(struct super_block *sb, int reason); 2754 void ext4_fc_stop_ineligible(struct super_block *sb); 2755 void ext4_fc_start_update(struct inode *inode); 2756 void ext4_fc_stop_update(struct inode *inode); 2757 void ext4_fc_del(struct inode *inode); 2758 bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block); 2759 void ext4_fc_replay_cleanup(struct super_block *sb); 2760 int ext4_fc_commit(journal_t *journal, tid_t commit_tid); 2761 int __init ext4_fc_init_dentry_cache(void); 2762 2763 /* mballoc.c */ 2764 extern const struct seq_operations ext4_mb_seq_groups_ops; 2765 extern long ext4_mb_stats; 2766 extern long ext4_mb_max_to_scan; 2767 extern int ext4_mb_init(struct super_block *); 2768 extern int ext4_mb_release(struct super_block *); 2769 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2770 struct ext4_allocation_request *, int *); 2771 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2772 extern void ext4_discard_preallocations(struct inode *, unsigned int); 2773 extern int __init ext4_init_mballoc(void); 2774 extern void ext4_exit_mballoc(void); 2775 extern ext4_group_t ext4_mb_prefetch(struct super_block *sb, 2776 ext4_group_t group, 2777 unsigned int nr, int *cnt); 2778 extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group, 2779 unsigned int nr); 2780 2781 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2782 struct buffer_head *bh, ext4_fsblk_t block, 2783 unsigned long count, int flags); 2784 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2785 ext4_group_t ngroups); 2786 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2787 ext4_group_t i, struct ext4_group_desc *desc); 2788 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2789 ext4_fsblk_t block, unsigned long count); 2790 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2791 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid); 2792 extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block, 2793 int len, int state); 2794 2795 /* inode.c */ 2796 void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw, 2797 struct ext4_inode_info *ei); 2798 int ext4_inode_is_fast_symlink(struct inode *inode); 2799 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2800 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2801 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count, 2802 bool wait, struct buffer_head **bhs); 2803 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2804 struct buffer_head *bh_result, int create); 2805 int ext4_get_block(struct inode *inode, sector_t iblock, 2806 struct buffer_head *bh_result, int create); 2807 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2808 struct buffer_head *bh, int create); 2809 int ext4_walk_page_buffers(handle_t *handle, 2810 struct buffer_head *head, 2811 unsigned from, 2812 unsigned to, 2813 int *partial, 2814 int (*fn)(handle_t *handle, 2815 struct buffer_head *bh)); 2816 int do_journal_get_write_access(handle_t *handle, 2817 struct buffer_head *bh); 2818 #define FALL_BACK_TO_NONDELALLOC 1 2819 #define CONVERT_INLINE_DATA 2 2820 2821 typedef enum { 2822 EXT4_IGET_NORMAL = 0, 2823 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */ 2824 EXT4_IGET_HANDLE = 0x0002 /* Inode # is from a handle */ 2825 } ext4_iget_flags; 2826 2827 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, 2828 ext4_iget_flags flags, const char *function, 2829 unsigned int line); 2830 2831 #define ext4_iget(sb, ino, flags) \ 2832 __ext4_iget((sb), (ino), (flags), __func__, __LINE__) 2833 2834 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2835 extern int ext4_setattr(struct dentry *, struct iattr *); 2836 extern int ext4_getattr(const struct path *, struct kstat *, u32, unsigned int); 2837 extern void ext4_evict_inode(struct inode *); 2838 extern void ext4_clear_inode(struct inode *); 2839 extern int ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int); 2840 extern int ext4_sync_inode(handle_t *, struct inode *); 2841 extern void ext4_dirty_inode(struct inode *, int); 2842 extern int ext4_change_inode_journal_flag(struct inode *, int); 2843 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2844 extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino, 2845 struct ext4_iloc *iloc); 2846 extern int ext4_inode_attach_jinode(struct inode *inode); 2847 extern int ext4_can_truncate(struct inode *inode); 2848 extern int ext4_truncate(struct inode *); 2849 extern int ext4_break_layouts(struct inode *); 2850 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2851 extern void ext4_set_inode_flags(struct inode *, bool init); 2852 extern int ext4_alloc_da_blocks(struct inode *inode); 2853 extern void ext4_set_aops(struct inode *inode); 2854 extern int ext4_writepage_trans_blocks(struct inode *); 2855 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2856 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2857 loff_t lstart, loff_t lend); 2858 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf); 2859 extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf); 2860 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2861 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 2862 extern void ext4_da_release_space(struct inode *inode, int to_free); 2863 extern void ext4_da_update_reserve_space(struct inode *inode, 2864 int used, int quota_claim); 2865 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 2866 ext4_fsblk_t pblk, ext4_lblk_t len); 2867 2868 /* indirect.c */ 2869 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2870 struct ext4_map_blocks *map, int flags); 2871 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2872 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2873 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2874 ext4_lblk_t start, ext4_lblk_t end); 2875 2876 /* ioctl.c */ 2877 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2878 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2879 extern void ext4_reset_inode_seed(struct inode *inode); 2880 2881 /* migrate.c */ 2882 extern int ext4_ext_migrate(struct inode *); 2883 extern int ext4_ind_migrate(struct inode *inode); 2884 2885 /* namei.c */ 2886 extern int ext4_init_new_dir(handle_t *handle, struct inode *dir, 2887 struct inode *inode); 2888 extern int ext4_dirblock_csum_verify(struct inode *inode, 2889 struct buffer_head *bh); 2890 extern int ext4_orphan_add(handle_t *, struct inode *); 2891 extern int ext4_orphan_del(handle_t *, struct inode *); 2892 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2893 __u32 start_minor_hash, __u32 *next_hash); 2894 extern int ext4_search_dir(struct buffer_head *bh, 2895 char *search_buf, 2896 int buf_size, 2897 struct inode *dir, 2898 struct ext4_filename *fname, 2899 unsigned int offset, 2900 struct ext4_dir_entry_2 **res_dir); 2901 extern int ext4_generic_delete_entry(struct inode *dir, 2902 struct ext4_dir_entry_2 *de_del, 2903 struct buffer_head *bh, 2904 void *entry_buf, 2905 int buf_size, 2906 int csum_size); 2907 extern bool ext4_empty_dir(struct inode *inode); 2908 2909 /* resize.c */ 2910 extern void ext4_kvfree_array_rcu(void *to_free); 2911 extern int ext4_group_add(struct super_block *sb, 2912 struct ext4_new_group_data *input); 2913 extern int ext4_group_extend(struct super_block *sb, 2914 struct ext4_super_block *es, 2915 ext4_fsblk_t n_blocks_count); 2916 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2917 2918 /* super.c */ 2919 extern struct buffer_head *ext4_sb_bread(struct super_block *sb, 2920 sector_t block, int op_flags); 2921 extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb, 2922 sector_t block); 2923 extern void ext4_read_bh_nowait(struct buffer_head *bh, int op_flags, 2924 bh_end_io_t *end_io); 2925 extern int ext4_read_bh(struct buffer_head *bh, int op_flags, 2926 bh_end_io_t *end_io); 2927 extern int ext4_read_bh_lock(struct buffer_head *bh, int op_flags, bool wait); 2928 extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block); 2929 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 2930 extern int ext4_calculate_overhead(struct super_block *sb); 2931 extern void ext4_superblock_csum_set(struct super_block *sb); 2932 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2933 ext4_group_t ngroup); 2934 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2935 char nbuf[16]); 2936 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb, 2937 ext4_group_t block_group, 2938 unsigned int flags); 2939 2940 extern __printf(6, 7) 2941 void __ext4_error(struct super_block *, const char *, unsigned int, int, __u64, 2942 const char *, ...); 2943 extern __printf(6, 7) 2944 void __ext4_error_inode(struct inode *, const char *, unsigned int, 2945 ext4_fsblk_t, int, const char *, ...); 2946 extern __printf(5, 6) 2947 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2948 const char *, ...); 2949 extern void __ext4_std_error(struct super_block *, const char *, 2950 unsigned int, int); 2951 extern __printf(5, 6) 2952 void __ext4_abort(struct super_block *, const char *, unsigned int, int, 2953 const char *, ...); 2954 extern __printf(4, 5) 2955 void __ext4_warning(struct super_block *, const char *, unsigned int, 2956 const char *, ...); 2957 extern __printf(4, 5) 2958 void __ext4_warning_inode(const struct inode *inode, const char *function, 2959 unsigned int line, const char *fmt, ...); 2960 extern __printf(3, 4) 2961 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2962 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2963 const char *, unsigned int, const char *); 2964 extern __printf(7, 8) 2965 void __ext4_grp_locked_error(const char *, unsigned int, 2966 struct super_block *, ext4_group_t, 2967 unsigned long, ext4_fsblk_t, 2968 const char *, ...); 2969 2970 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 2971 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 2972 2973 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \ 2974 __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a) 2975 2976 #define ext4_error_inode_block(inode, block, err, fmt, a...) \ 2977 __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \ 2978 (fmt), ## a) 2979 2980 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 2981 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 2982 2983 #ifdef CONFIG_PRINTK 2984 2985 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2986 __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__) 2987 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 2988 __ext4_error_inode((inode), (func), (line), (block), \ 2989 (err), (fmt), ##__VA_ARGS__) 2990 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2991 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2992 #define ext4_error(sb, fmt, ...) \ 2993 __ext4_error((sb), __func__, __LINE__, 0, 0, (fmt), ##__VA_ARGS__) 2994 #define ext4_error_err(sb, err, fmt, ...) \ 2995 __ext4_error((sb), __func__, __LINE__, (err), 0, (fmt), ##__VA_ARGS__) 2996 #define ext4_abort(sb, err, fmt, ...) \ 2997 __ext4_abort((sb), __func__, __LINE__, (err), (fmt), ##__VA_ARGS__) 2998 #define ext4_warning(sb, fmt, ...) \ 2999 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 3000 #define ext4_warning_inode(inode, fmt, ...) \ 3001 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 3002 #define ext4_msg(sb, level, fmt, ...) \ 3003 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 3004 #define dump_mmp_msg(sb, mmp, msg) \ 3005 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 3006 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 3007 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 3008 fmt, ##__VA_ARGS__) 3009 3010 #else 3011 3012 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 3013 do { \ 3014 no_printk(fmt, ##__VA_ARGS__); \ 3015 __ext4_error_inode(inode, "", 0, block, 0, " "); \ 3016 } while (0) 3017 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 3018 do { \ 3019 no_printk(fmt, ##__VA_ARGS__); \ 3020 __ext4_error_inode(inode, "", 0, block, err, " "); \ 3021 } while (0) 3022 #define ext4_error_file(file, func, line, block, fmt, ...) \ 3023 do { \ 3024 no_printk(fmt, ##__VA_ARGS__); \ 3025 __ext4_error_file(file, "", 0, block, " "); \ 3026 } while (0) 3027 #define ext4_error(sb, fmt, ...) \ 3028 do { \ 3029 no_printk(fmt, ##__VA_ARGS__); \ 3030 __ext4_error(sb, "", 0, 0, 0, " "); \ 3031 } while (0) 3032 #define ext4_error_err(sb, err, fmt, ...) \ 3033 do { \ 3034 no_printk(fmt, ##__VA_ARGS__); \ 3035 __ext4_error(sb, "", 0, err, 0, " "); \ 3036 } while (0) 3037 #define ext4_abort(sb, err, fmt, ...) \ 3038 do { \ 3039 no_printk(fmt, ##__VA_ARGS__); \ 3040 __ext4_abort(sb, "", 0, err, " "); \ 3041 } while (0) 3042 #define ext4_warning(sb, fmt, ...) \ 3043 do { \ 3044 no_printk(fmt, ##__VA_ARGS__); \ 3045 __ext4_warning(sb, "", 0, " "); \ 3046 } while (0) 3047 #define ext4_warning_inode(inode, fmt, ...) \ 3048 do { \ 3049 no_printk(fmt, ##__VA_ARGS__); \ 3050 __ext4_warning_inode(inode, "", 0, " "); \ 3051 } while (0) 3052 #define ext4_msg(sb, level, fmt, ...) \ 3053 do { \ 3054 no_printk(fmt, ##__VA_ARGS__); \ 3055 __ext4_msg(sb, "", " "); \ 3056 } while (0) 3057 #define dump_mmp_msg(sb, mmp, msg) \ 3058 __dump_mmp_msg(sb, mmp, "", 0, "") 3059 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 3060 do { \ 3061 no_printk(fmt, ##__VA_ARGS__); \ 3062 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 3063 } while (0) 3064 3065 #endif 3066 3067 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 3068 struct ext4_group_desc *bg); 3069 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 3070 struct ext4_group_desc *bg); 3071 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 3072 struct ext4_group_desc *bg); 3073 extern __u32 ext4_free_group_clusters(struct super_block *sb, 3074 struct ext4_group_desc *bg); 3075 extern __u32 ext4_free_inodes_count(struct super_block *sb, 3076 struct ext4_group_desc *bg); 3077 extern __u32 ext4_used_dirs_count(struct super_block *sb, 3078 struct ext4_group_desc *bg); 3079 extern __u32 ext4_itable_unused_count(struct super_block *sb, 3080 struct ext4_group_desc *bg); 3081 extern void ext4_block_bitmap_set(struct super_block *sb, 3082 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3083 extern void ext4_inode_bitmap_set(struct super_block *sb, 3084 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3085 extern void ext4_inode_table_set(struct super_block *sb, 3086 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3087 extern void ext4_free_group_clusters_set(struct super_block *sb, 3088 struct ext4_group_desc *bg, 3089 __u32 count); 3090 extern void ext4_free_inodes_set(struct super_block *sb, 3091 struct ext4_group_desc *bg, __u32 count); 3092 extern void ext4_used_dirs_set(struct super_block *sb, 3093 struct ext4_group_desc *bg, __u32 count); 3094 extern void ext4_itable_unused_set(struct super_block *sb, 3095 struct ext4_group_desc *bg, __u32 count); 3096 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 3097 struct ext4_group_desc *gdp); 3098 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 3099 struct ext4_group_desc *gdp); 3100 extern int ext4_register_li_request(struct super_block *sb, 3101 ext4_group_t first_not_zeroed); 3102 3103 static inline int ext4_has_metadata_csum(struct super_block *sb) 3104 { 3105 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 3106 !EXT4_SB(sb)->s_chksum_driver); 3107 3108 return ext4_has_feature_metadata_csum(sb) && 3109 (EXT4_SB(sb)->s_chksum_driver != NULL); 3110 } 3111 3112 static inline int ext4_has_group_desc_csum(struct super_block *sb) 3113 { 3114 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb); 3115 } 3116 3117 #define ext4_read_incompat_64bit_val(es, name) \ 3118 (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \ 3119 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \ 3120 le32_to_cpu(es->name##_lo)) 3121 3122 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 3123 { 3124 return ext4_read_incompat_64bit_val(es, s_blocks_count); 3125 } 3126 3127 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 3128 { 3129 return ext4_read_incompat_64bit_val(es, s_r_blocks_count); 3130 } 3131 3132 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 3133 { 3134 return ext4_read_incompat_64bit_val(es, s_free_blocks_count); 3135 } 3136 3137 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 3138 ext4_fsblk_t blk) 3139 { 3140 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 3141 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 3142 } 3143 3144 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 3145 ext4_fsblk_t blk) 3146 { 3147 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 3148 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 3149 } 3150 3151 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 3152 ext4_fsblk_t blk) 3153 { 3154 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 3155 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 3156 } 3157 3158 static inline loff_t ext4_isize(struct super_block *sb, 3159 struct ext4_inode *raw_inode) 3160 { 3161 if (ext4_has_feature_largedir(sb) || 3162 S_ISREG(le16_to_cpu(raw_inode->i_mode))) 3163 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 3164 le32_to_cpu(raw_inode->i_size_lo); 3165 3166 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 3167 } 3168 3169 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 3170 { 3171 raw_inode->i_size_lo = cpu_to_le32(i_size); 3172 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 3173 } 3174 3175 static inline 3176 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 3177 ext4_group_t group) 3178 { 3179 struct ext4_group_info **grp_info; 3180 long indexv, indexh; 3181 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 3182 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 3183 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 3184 grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv); 3185 return grp_info[indexh]; 3186 } 3187 3188 /* 3189 * Reading s_groups_count requires using smp_rmb() afterwards. See 3190 * the locking protocol documented in the comments of ext4_group_add() 3191 * in resize.c 3192 */ 3193 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 3194 { 3195 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 3196 3197 smp_rmb(); 3198 return ngroups; 3199 } 3200 3201 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 3202 ext4_group_t block_group) 3203 { 3204 return block_group >> sbi->s_log_groups_per_flex; 3205 } 3206 3207 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 3208 { 3209 return 1 << sbi->s_log_groups_per_flex; 3210 } 3211 3212 #define ext4_std_error(sb, errno) \ 3213 do { \ 3214 if ((errno)) \ 3215 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 3216 } while (0) 3217 3218 #ifdef CONFIG_SMP 3219 /* Each CPU can accumulate percpu_counter_batch clusters in their local 3220 * counters. So we need to make sure we have free clusters more 3221 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 3222 */ 3223 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 3224 #else 3225 #define EXT4_FREECLUSTERS_WATERMARK 0 3226 #endif 3227 3228 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 3229 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 3230 { 3231 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 3232 !inode_is_locked(inode)); 3233 down_write(&EXT4_I(inode)->i_data_sem); 3234 if (newsize > EXT4_I(inode)->i_disksize) 3235 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize); 3236 up_write(&EXT4_I(inode)->i_data_sem); 3237 } 3238 3239 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 3240 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 3241 { 3242 int changed = 0; 3243 3244 if (newsize > inode->i_size) { 3245 i_size_write(inode, newsize); 3246 changed = 1; 3247 } 3248 if (newsize > EXT4_I(inode)->i_disksize) { 3249 ext4_update_i_disksize(inode, newsize); 3250 changed |= 2; 3251 } 3252 return changed; 3253 } 3254 3255 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 3256 loff_t len); 3257 3258 struct ext4_group_info { 3259 unsigned long bb_state; 3260 #ifdef AGGRESSIVE_CHECK 3261 unsigned long bb_check_counter; 3262 #endif 3263 struct rb_root bb_free_root; 3264 ext4_grpblk_t bb_first_free; /* first free block */ 3265 ext4_grpblk_t bb_free; /* total free blocks */ 3266 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 3267 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 3268 struct list_head bb_prealloc_list; 3269 #ifdef DOUBLE_CHECK 3270 void *bb_bitmap; 3271 #endif 3272 struct rw_semaphore alloc_sem; 3273 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 3274 * regions, index is order. 3275 * bb_counters[3] = 5 means 3276 * 5 free 8-block regions. */ 3277 }; 3278 3279 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 3280 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 3281 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 3282 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 3283 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \ 3284 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT) 3285 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \ 3286 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT) 3287 #define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4 3288 3289 #define EXT4_MB_GRP_NEED_INIT(grp) \ 3290 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 3291 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 3292 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3293 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 3294 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3295 3296 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 3297 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3298 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 3299 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3300 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 3301 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3302 #define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \ 3303 (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state))) 3304 3305 #define EXT4_MAX_CONTENTION 8 3306 #define EXT4_CONTENTION_THRESHOLD 2 3307 3308 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 3309 ext4_group_t group) 3310 { 3311 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 3312 } 3313 3314 /* 3315 * Returns true if the filesystem is busy enough that attempts to 3316 * access the block group locks has run into contention. 3317 */ 3318 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 3319 { 3320 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 3321 } 3322 3323 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 3324 { 3325 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 3326 if (spin_trylock(lock)) 3327 /* 3328 * We're able to grab the lock right away, so drop the 3329 * lock contention counter. 3330 */ 3331 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 3332 else { 3333 /* 3334 * The lock is busy, so bump the contention counter, 3335 * and then wait on the spin lock. 3336 */ 3337 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 3338 EXT4_MAX_CONTENTION); 3339 spin_lock(lock); 3340 } 3341 } 3342 3343 static inline void ext4_unlock_group(struct super_block *sb, 3344 ext4_group_t group) 3345 { 3346 spin_unlock(ext4_group_lock_ptr(sb, group)); 3347 } 3348 3349 /* 3350 * Block validity checking 3351 */ 3352 #define ext4_check_indirect_blockref(inode, bh) \ 3353 ext4_check_blockref(__func__, __LINE__, inode, \ 3354 (__le32 *)(bh)->b_data, \ 3355 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 3356 3357 #define ext4_ind_check_inode(inode) \ 3358 ext4_check_blockref(__func__, __LINE__, inode, \ 3359 EXT4_I(inode)->i_data, \ 3360 EXT4_NDIR_BLOCKS) 3361 3362 /* 3363 * Inodes and files operations 3364 */ 3365 3366 /* dir.c */ 3367 extern const struct file_operations ext4_dir_operations; 3368 3369 #ifdef CONFIG_UNICODE 3370 extern const struct dentry_operations ext4_dentry_ops; 3371 #endif 3372 3373 /* file.c */ 3374 extern const struct inode_operations ext4_file_inode_operations; 3375 extern const struct file_operations ext4_file_operations; 3376 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 3377 3378 /* inline.c */ 3379 extern int ext4_get_max_inline_size(struct inode *inode); 3380 extern int ext4_find_inline_data_nolock(struct inode *inode); 3381 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 3382 unsigned int len); 3383 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 3384 3385 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 3386 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 3387 struct inode *inode, 3388 loff_t pos, unsigned len, 3389 unsigned flags, 3390 struct page **pagep); 3391 extern int ext4_write_inline_data_end(struct inode *inode, 3392 loff_t pos, unsigned len, 3393 unsigned copied, 3394 struct page *page); 3395 extern struct buffer_head * 3396 ext4_journalled_write_inline_data(struct inode *inode, 3397 unsigned len, 3398 struct page *page); 3399 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 3400 struct inode *inode, 3401 loff_t pos, unsigned len, 3402 unsigned flags, 3403 struct page **pagep, 3404 void **fsdata); 3405 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 3406 unsigned len, unsigned copied, 3407 struct page *page); 3408 extern int ext4_try_add_inline_entry(handle_t *handle, 3409 struct ext4_filename *fname, 3410 struct inode *dir, struct inode *inode); 3411 extern int ext4_try_create_inline_dir(handle_t *handle, 3412 struct inode *parent, 3413 struct inode *inode); 3414 extern int ext4_read_inline_dir(struct file *filp, 3415 struct dir_context *ctx, 3416 int *has_inline_data); 3417 extern int ext4_inlinedir_to_tree(struct file *dir_file, 3418 struct inode *dir, ext4_lblk_t block, 3419 struct dx_hash_info *hinfo, 3420 __u32 start_hash, __u32 start_minor_hash, 3421 int *has_inline_data); 3422 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3423 struct ext4_filename *fname, 3424 struct ext4_dir_entry_2 **res_dir, 3425 int *has_inline_data); 3426 extern int ext4_delete_inline_entry(handle_t *handle, 3427 struct inode *dir, 3428 struct ext4_dir_entry_2 *de_del, 3429 struct buffer_head *bh, 3430 int *has_inline_data); 3431 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); 3432 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3433 struct ext4_dir_entry_2 **parent_de, 3434 int *retval); 3435 extern int ext4_inline_data_fiemap(struct inode *inode, 3436 struct fiemap_extent_info *fieinfo, 3437 int *has_inline, __u64 start, __u64 len); 3438 3439 struct iomap; 3440 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap); 3441 3442 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3443 3444 extern int ext4_convert_inline_data(struct inode *inode); 3445 3446 static inline int ext4_has_inline_data(struct inode *inode) 3447 { 3448 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3449 EXT4_I(inode)->i_inline_off; 3450 } 3451 3452 /* namei.c */ 3453 extern const struct inode_operations ext4_dir_inode_operations; 3454 extern const struct inode_operations ext4_special_inode_operations; 3455 extern struct dentry *ext4_get_parent(struct dentry *child); 3456 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3457 struct ext4_dir_entry_2 *de, 3458 int blocksize, int csum_size, 3459 unsigned int parent_ino, int dotdot_real_len); 3460 extern void ext4_initialize_dirent_tail(struct buffer_head *bh, 3461 unsigned int blocksize); 3462 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode, 3463 struct buffer_head *bh); 3464 extern int ext4_ci_compare(const struct inode *parent, 3465 const struct qstr *fname, 3466 const struct qstr *entry, bool quick); 3467 extern int __ext4_unlink(struct inode *dir, const struct qstr *d_name, 3468 struct inode *inode); 3469 extern int __ext4_link(struct inode *dir, struct inode *inode, 3470 struct dentry *dentry); 3471 3472 #define S_SHIFT 12 3473 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = { 3474 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3475 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3476 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3477 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3478 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3479 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3480 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3481 }; 3482 3483 static inline void ext4_set_de_type(struct super_block *sb, 3484 struct ext4_dir_entry_2 *de, 3485 umode_t mode) { 3486 if (ext4_has_feature_filetype(sb)) 3487 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3488 } 3489 3490 /* readpages.c */ 3491 extern int ext4_mpage_readpages(struct inode *inode, 3492 struct readahead_control *rac, struct page *page); 3493 extern int __init ext4_init_post_read_processing(void); 3494 extern void ext4_exit_post_read_processing(void); 3495 3496 /* symlink.c */ 3497 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3498 extern const struct inode_operations ext4_symlink_inode_operations; 3499 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3500 3501 /* sysfs.c */ 3502 extern int ext4_register_sysfs(struct super_block *sb); 3503 extern void ext4_unregister_sysfs(struct super_block *sb); 3504 extern int __init ext4_init_sysfs(void); 3505 extern void ext4_exit_sysfs(void); 3506 3507 /* block_validity */ 3508 extern void ext4_release_system_zone(struct super_block *sb); 3509 extern int ext4_setup_system_zone(struct super_block *sb); 3510 extern int __init ext4_init_system_zone(void); 3511 extern void ext4_exit_system_zone(void); 3512 extern int ext4_inode_block_valid(struct inode *inode, 3513 ext4_fsblk_t start_blk, 3514 unsigned int count); 3515 extern int ext4_check_blockref(const char *, unsigned int, 3516 struct inode *, __le32 *, unsigned int); 3517 3518 /* extents.c */ 3519 struct ext4_ext_path; 3520 struct ext4_extent; 3521 3522 /* 3523 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3524 * __le32. 3525 */ 3526 #define EXT_MAX_BLOCKS 0xffffffff 3527 3528 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode); 3529 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3530 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3531 struct ext4_map_blocks *map, int flags); 3532 extern int ext4_ext_truncate(handle_t *, struct inode *); 3533 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3534 ext4_lblk_t end); 3535 extern void ext4_ext_init(struct super_block *); 3536 extern void ext4_ext_release(struct super_block *); 3537 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3538 loff_t len); 3539 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3540 loff_t offset, ssize_t len); 3541 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle, 3542 ext4_io_end_t *io_end); 3543 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3544 struct ext4_map_blocks *map, int flags); 3545 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3546 int num, 3547 struct ext4_ext_path *path); 3548 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3549 struct ext4_ext_path **, 3550 struct ext4_extent *, int); 3551 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3552 struct ext4_ext_path **, 3553 int flags); 3554 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 3555 extern int ext4_ext_check_inode(struct inode *inode); 3556 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3557 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3558 __u64 start, __u64 len); 3559 extern int ext4_get_es_cache(struct inode *inode, 3560 struct fiemap_extent_info *fieinfo, 3561 __u64 start, __u64 len); 3562 extern int ext4_ext_precache(struct inode *inode); 3563 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3564 struct inode *inode2, ext4_lblk_t lblk1, 3565 ext4_lblk_t lblk2, ext4_lblk_t count, 3566 int mark_unwritten,int *err); 3567 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu); 3568 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode, 3569 int check_cred, int restart_cred, 3570 int revoke_cred); 3571 extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end); 3572 extern int ext4_ext_replay_set_iblocks(struct inode *inode); 3573 extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start, 3574 int len, int unwritten, ext4_fsblk_t pblk); 3575 extern int ext4_ext_clear_bb(struct inode *inode); 3576 3577 3578 /* move_extent.c */ 3579 extern void ext4_double_down_write_data_sem(struct inode *first, 3580 struct inode *second); 3581 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3582 struct inode *donor_inode); 3583 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3584 __u64 start_orig, __u64 start_donor, 3585 __u64 len, __u64 *moved_len); 3586 3587 /* page-io.c */ 3588 extern int __init ext4_init_pageio(void); 3589 extern void ext4_exit_pageio(void); 3590 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3591 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3592 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3593 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3594 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3595 struct writeback_control *wbc); 3596 extern void ext4_end_io_rsv_work(struct work_struct *work); 3597 extern void ext4_io_submit(struct ext4_io_submit *io); 3598 extern int ext4_bio_write_page(struct ext4_io_submit *io, 3599 struct page *page, 3600 int len, 3601 struct writeback_control *wbc, 3602 bool keep_towrite); 3603 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end); 3604 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end); 3605 3606 /* mmp.c */ 3607 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3608 3609 /* verity.c */ 3610 extern const struct fsverity_operations ext4_verityops; 3611 3612 /* 3613 * Add new method to test whether block and inode bitmaps are properly 3614 * initialized. With uninit_bg reading the block from disk is not enough 3615 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3616 */ 3617 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3618 3619 static inline int bitmap_uptodate(struct buffer_head *bh) 3620 { 3621 return (buffer_uptodate(bh) && 3622 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3623 } 3624 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3625 { 3626 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3627 } 3628 3629 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3630 3631 /* For ioend & aio unwritten conversion wait queues */ 3632 #define EXT4_WQ_HASH_SZ 37 3633 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3634 EXT4_WQ_HASH_SZ]) 3635 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3636 3637 extern int ext4_resize_begin(struct super_block *sb); 3638 extern void ext4_resize_end(struct super_block *sb); 3639 3640 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 3641 struct ext4_io_end *io_end) 3642 { 3643 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 3644 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3645 atomic_inc(&EXT4_I(inode)->i_unwritten); 3646 } 3647 } 3648 3649 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3650 { 3651 struct inode *inode = io_end->inode; 3652 3653 if (io_end->flag & EXT4_IO_END_UNWRITTEN) { 3654 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3655 /* Wake up anyone waiting on unwritten extent conversion */ 3656 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) 3657 wake_up_all(ext4_ioend_wq(inode)); 3658 } 3659 } 3660 3661 extern const struct iomap_ops ext4_iomap_ops; 3662 extern const struct iomap_ops ext4_iomap_overwrite_ops; 3663 extern const struct iomap_ops ext4_iomap_report_ops; 3664 3665 static inline int ext4_buffer_uptodate(struct buffer_head *bh) 3666 { 3667 /* 3668 * If the buffer has the write error flag, we have failed 3669 * to write out data in the block. In this case, we don't 3670 * have to read the block because we may read the old data 3671 * successfully. 3672 */ 3673 if (!buffer_uptodate(bh) && buffer_write_io_error(bh)) 3674 set_buffer_uptodate(bh); 3675 return buffer_uptodate(bh); 3676 } 3677 3678 #endif /* __KERNEL__ */ 3679 3680 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3681 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3682 3683 #endif /* _EXT4_H */ 3684