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/version.h> 31 #include <linux/wait.h> 32 #include <linux/sched/signal.h> 33 #include <linux/blockgroup_lock.h> 34 #include <linux/percpu_counter.h> 35 #include <linux/ratelimit.h> 36 #include <crypto/hash.h> 37 #include <linux/falloc.h> 38 #include <linux/percpu-rwsem.h> 39 #include <linux/fiemap.h> 40 #ifdef __KERNEL__ 41 #include <linux/compat.h> 42 #endif 43 44 #include <linux/fscrypt.h> 45 #include <linux/fsverity.h> 46 47 #include <linux/compiler.h> 48 49 /* 50 * The fourth extended filesystem constants/structures 51 */ 52 53 /* 54 * with AGGRESSIVE_CHECK allocator runs consistency checks over 55 * structures. these checks slow things down a lot 56 */ 57 #define AGGRESSIVE_CHECK__ 58 59 /* 60 * with DOUBLE_CHECK defined mballoc creates persistent in-core 61 * bitmaps, maintains and uses them to check for double allocations 62 */ 63 #define DOUBLE_CHECK__ 64 65 /* 66 * Define EXT4FS_DEBUG to produce debug messages 67 */ 68 #undef EXT4FS_DEBUG 69 70 /* 71 * Debug code 72 */ 73 #ifdef EXT4FS_DEBUG 74 #define ext4_debug(f, a...) \ 75 do { \ 76 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 77 __FILE__, __LINE__, __func__); \ 78 printk(KERN_DEBUG f, ## a); \ 79 } while (0) 80 #else 81 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 82 #endif 83 84 /* 85 * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c 86 */ 87 #define EXT_DEBUG__ 88 89 /* 90 * Dynamic printk for controlled extents debugging. 91 */ 92 #ifdef CONFIG_EXT4_DEBUG 93 #define ext_debug(ino, fmt, ...) \ 94 pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt, \ 95 current->comm, task_pid_nr(current), \ 96 ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__, \ 97 __func__, ##__VA_ARGS__) 98 #else 99 #define ext_debug(ino, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 100 #endif 101 102 /* data type for block offset of block group */ 103 typedef int ext4_grpblk_t; 104 105 /* data type for filesystem-wide blocks number */ 106 typedef unsigned long long ext4_fsblk_t; 107 108 /* data type for file logical block number */ 109 typedef __u32 ext4_lblk_t; 110 111 /* data type for block group number */ 112 typedef unsigned int ext4_group_t; 113 114 enum SHIFT_DIRECTION { 115 SHIFT_LEFT = 0, 116 SHIFT_RIGHT, 117 }; 118 119 /* 120 * Flags used in mballoc's allocation_context flags field. 121 * 122 * Also used to show what's going on for debugging purposes when the 123 * flag field is exported via the traceport interface 124 */ 125 126 /* prefer goal again. length */ 127 #define EXT4_MB_HINT_MERGE 0x0001 128 /* blocks already reserved */ 129 #define EXT4_MB_HINT_RESERVED 0x0002 130 /* metadata is being allocated */ 131 #define EXT4_MB_HINT_METADATA 0x0004 132 /* first blocks in the file */ 133 #define EXT4_MB_HINT_FIRST 0x0008 134 /* search for the best chunk */ 135 #define EXT4_MB_HINT_BEST 0x0010 136 /* data is being allocated */ 137 #define EXT4_MB_HINT_DATA 0x0020 138 /* don't preallocate (for tails) */ 139 #define EXT4_MB_HINT_NOPREALLOC 0x0040 140 /* allocate for locality group */ 141 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 142 /* allocate goal blocks or none */ 143 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 144 /* goal is meaningful */ 145 #define EXT4_MB_HINT_TRY_GOAL 0x0200 146 /* blocks already pre-reserved by delayed allocation */ 147 #define EXT4_MB_DELALLOC_RESERVED 0x0400 148 /* We are doing stream allocation */ 149 #define EXT4_MB_STREAM_ALLOC 0x0800 150 /* Use reserved root blocks if needed */ 151 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 152 /* Use blocks from reserved pool */ 153 #define EXT4_MB_USE_RESERVED 0x2000 154 /* Do strict check for free blocks while retrying block allocation */ 155 #define EXT4_MB_STRICT_CHECK 0x4000 156 157 struct ext4_allocation_request { 158 /* target inode for block we're allocating */ 159 struct inode *inode; 160 /* how many blocks we want to allocate */ 161 unsigned int len; 162 /* logical block in target inode */ 163 ext4_lblk_t logical; 164 /* the closest logical allocated block to the left */ 165 ext4_lblk_t lleft; 166 /* the closest logical allocated block to the right */ 167 ext4_lblk_t lright; 168 /* phys. target (a hint) */ 169 ext4_fsblk_t goal; 170 /* phys. block for the closest logical allocated block to the left */ 171 ext4_fsblk_t pleft; 172 /* phys. block for the closest logical allocated block to the right */ 173 ext4_fsblk_t pright; 174 /* flags. see above EXT4_MB_HINT_* */ 175 unsigned int flags; 176 }; 177 178 /* 179 * Logical to physical block mapping, used by ext4_map_blocks() 180 * 181 * This structure is used to pass requests into ext4_map_blocks() as 182 * well as to store the information returned by ext4_map_blocks(). It 183 * takes less room on the stack than a struct buffer_head. 184 */ 185 #define EXT4_MAP_NEW BIT(BH_New) 186 #define EXT4_MAP_MAPPED BIT(BH_Mapped) 187 #define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten) 188 #define EXT4_MAP_BOUNDARY BIT(BH_Boundary) 189 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 190 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 191 192 struct ext4_map_blocks { 193 ext4_fsblk_t m_pblk; 194 ext4_lblk_t m_lblk; 195 unsigned int m_len; 196 unsigned int m_flags; 197 }; 198 199 /* 200 * Block validity checking, system zone rbtree. 201 */ 202 struct ext4_system_blocks { 203 struct rb_root root; 204 struct rcu_head rcu; 205 }; 206 207 /* 208 * Flags for ext4_io_end->flags 209 */ 210 #define EXT4_IO_END_UNWRITTEN 0x0001 211 212 struct ext4_io_end_vec { 213 struct list_head list; /* list of io_end_vec */ 214 loff_t offset; /* offset in the file */ 215 ssize_t size; /* size of the extent */ 216 }; 217 218 /* 219 * For converting unwritten extents on a work queue. 'handle' is used for 220 * buffered writeback. 221 */ 222 typedef struct ext4_io_end { 223 struct list_head list; /* per-file finished IO list */ 224 handle_t *handle; /* handle reserved for extent 225 * conversion */ 226 struct inode *inode; /* file being written to */ 227 struct bio *bio; /* Linked list of completed 228 * bios covering the extent */ 229 unsigned int flag; /* unwritten or not */ 230 atomic_t count; /* reference counter */ 231 struct list_head list_vec; /* list of ext4_io_end_vec */ 232 } ext4_io_end_t; 233 234 struct ext4_io_submit { 235 struct writeback_control *io_wbc; 236 struct bio *io_bio; 237 ext4_io_end_t *io_end; 238 sector_t io_next_block; 239 }; 240 241 /* 242 * Special inodes numbers 243 */ 244 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 245 #define EXT4_ROOT_INO 2 /* Root inode */ 246 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 247 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 248 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 249 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 250 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 251 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 252 253 /* First non-reserved inode for old ext4 filesystems */ 254 #define EXT4_GOOD_OLD_FIRST_INO 11 255 256 /* 257 * Maximal count of links to a file 258 */ 259 #define EXT4_LINK_MAX 65000 260 261 /* 262 * Macro-instructions used to manage several block sizes 263 */ 264 #define EXT4_MIN_BLOCK_SIZE 1024 265 #define EXT4_MAX_BLOCK_SIZE 65536 266 #define EXT4_MIN_BLOCK_LOG_SIZE 10 267 #define EXT4_MAX_BLOCK_LOG_SIZE 16 268 #define EXT4_MAX_CLUSTER_LOG_SIZE 30 269 #ifdef __KERNEL__ 270 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 271 #else 272 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 273 #endif 274 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 275 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 276 EXT4_SB(s)->s_cluster_bits) 277 #ifdef __KERNEL__ 278 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 279 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 280 #else 281 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 282 #endif 283 #ifdef __KERNEL__ 284 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 285 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 286 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 287 #else 288 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 289 EXT4_GOOD_OLD_INODE_SIZE : \ 290 (s)->s_inode_size) 291 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 292 EXT4_GOOD_OLD_FIRST_INO : \ 293 (s)->s_first_ino) 294 #endif 295 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 296 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \ 297 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \ 298 blkbits)) 299 300 /* Translate a block number to a cluster number */ 301 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 302 /* Translate a cluster number to a block number */ 303 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 304 /* Translate # of blks to # of clusters */ 305 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 306 (sbi)->s_cluster_bits) 307 /* Mask out the low bits to get the starting block of the cluster */ 308 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 309 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 310 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 311 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 312 /* Fill in the low bits to get the last block of the cluster */ 313 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \ 314 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1)) 315 /* Get the cluster offset */ 316 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 317 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 318 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 319 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 320 321 /* 322 * Structure of a blocks group descriptor 323 */ 324 struct ext4_group_desc 325 { 326 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 327 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 328 __le32 bg_inode_table_lo; /* Inodes table block */ 329 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 330 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 331 __le16 bg_used_dirs_count_lo; /* Directories count */ 332 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 333 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 334 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 335 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 336 __le16 bg_itable_unused_lo; /* Unused inodes count */ 337 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 338 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 339 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 340 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 341 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 342 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 343 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 344 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 345 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 346 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 347 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 348 __u32 bg_reserved; 349 }; 350 351 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 352 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 353 sizeof(__le16)) 354 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 355 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 356 sizeof(__le16)) 357 358 /* 359 * Structure of a flex block group info 360 */ 361 362 struct flex_groups { 363 atomic64_t free_clusters; 364 atomic_t free_inodes; 365 atomic_t used_dirs; 366 }; 367 368 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 369 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 370 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 371 372 /* 373 * Macro-instructions used to manage group descriptors 374 */ 375 #define EXT4_MIN_DESC_SIZE 32 376 #define EXT4_MIN_DESC_SIZE_64BIT 64 377 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 378 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 379 #ifdef __KERNEL__ 380 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 381 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 382 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 383 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 384 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 385 #else 386 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 387 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 388 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 389 #endif 390 391 /* 392 * Constants relative to the data blocks 393 */ 394 #define EXT4_NDIR_BLOCKS 12 395 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 396 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 397 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 398 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 399 400 /* 401 * Inode flags 402 */ 403 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 404 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 405 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 406 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 407 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 408 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 409 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 410 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 411 /* Reserved for compression usage... */ 412 #define EXT4_DIRTY_FL 0x00000100 413 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 414 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 415 /* nb: was previously EXT2_ECOMPR_FL */ 416 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 417 /* End compression flags --- maybe not all used */ 418 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 419 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 420 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 421 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 422 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 423 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 424 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 425 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 426 #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */ 427 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 428 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */ 429 430 #define EXT4_DAX_FL 0x02000000 /* Inode is DAX */ 431 432 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 433 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 434 #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */ 435 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 436 437 #define EXT4_FL_USER_VISIBLE 0x725BDFFF /* User visible flags */ 438 #define EXT4_FL_USER_MODIFIABLE 0x624BC0FF /* User modifiable flags */ 439 440 /* Flags we can manipulate with through EXT4_IOC_FSSETXATTR */ 441 #define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \ 442 EXT4_IMMUTABLE_FL | \ 443 EXT4_APPEND_FL | \ 444 EXT4_NODUMP_FL | \ 445 EXT4_NOATIME_FL | \ 446 EXT4_PROJINHERIT_FL | \ 447 EXT4_DAX_FL) 448 449 /* Flags that should be inherited by new inodes from their parent. */ 450 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 451 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 452 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 453 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 454 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\ 455 EXT4_DAX_FL) 456 457 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 458 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\ 459 EXT4_PROJINHERIT_FL)) 460 461 /* Flags that are appropriate for non-directories/regular files. */ 462 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 463 464 /* The only flags that should be swapped */ 465 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL) 466 467 /* Flags which are mutually exclusive to DAX */ 468 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\ 469 EXT4_JOURNAL_DATA_FL) 470 471 /* Mask out flags that are inappropriate for the given type of inode. */ 472 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 473 { 474 if (S_ISDIR(mode)) 475 return flags; 476 else if (S_ISREG(mode)) 477 return flags & EXT4_REG_FLMASK; 478 else 479 return flags & EXT4_OTHER_FLMASK; 480 } 481 482 /* 483 * Inode flags used for atomic set/get 484 */ 485 enum { 486 EXT4_INODE_SECRM = 0, /* Secure deletion */ 487 EXT4_INODE_UNRM = 1, /* Undelete */ 488 EXT4_INODE_COMPR = 2, /* Compress file */ 489 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 490 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 491 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 492 EXT4_INODE_NODUMP = 6, /* do not dump file */ 493 EXT4_INODE_NOATIME = 7, /* do not update atime */ 494 /* Reserved for compression usage... */ 495 EXT4_INODE_DIRTY = 8, 496 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 497 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 498 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 499 /* End compression flags --- maybe not all used */ 500 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 501 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 502 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 503 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 504 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 505 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 506 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 507 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 508 EXT4_INODE_VERITY = 20, /* Verity protected inode */ 509 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 510 /* 22 was formerly EXT4_INODE_EOFBLOCKS */ 511 EXT4_INODE_DAX = 25, /* Inode is DAX */ 512 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 513 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 514 EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */ 515 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 516 }; 517 518 /* 519 * Since it's pretty easy to mix up bit numbers and hex values, we use a 520 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 521 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 522 * any extra space in the compiled kernel image, otherwise, the build will fail. 523 * It's important that these values are the same, since we are using 524 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 525 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 526 * values found in ext2, ext3 and ext4 filesystems, and of course the values 527 * defined in e2fsprogs. 528 * 529 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 530 */ 531 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 532 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 533 534 static inline void ext4_check_flag_values(void) 535 { 536 CHECK_FLAG_VALUE(SECRM); 537 CHECK_FLAG_VALUE(UNRM); 538 CHECK_FLAG_VALUE(COMPR); 539 CHECK_FLAG_VALUE(SYNC); 540 CHECK_FLAG_VALUE(IMMUTABLE); 541 CHECK_FLAG_VALUE(APPEND); 542 CHECK_FLAG_VALUE(NODUMP); 543 CHECK_FLAG_VALUE(NOATIME); 544 CHECK_FLAG_VALUE(DIRTY); 545 CHECK_FLAG_VALUE(COMPRBLK); 546 CHECK_FLAG_VALUE(NOCOMPR); 547 CHECK_FLAG_VALUE(ENCRYPT); 548 CHECK_FLAG_VALUE(INDEX); 549 CHECK_FLAG_VALUE(IMAGIC); 550 CHECK_FLAG_VALUE(JOURNAL_DATA); 551 CHECK_FLAG_VALUE(NOTAIL); 552 CHECK_FLAG_VALUE(DIRSYNC); 553 CHECK_FLAG_VALUE(TOPDIR); 554 CHECK_FLAG_VALUE(HUGE_FILE); 555 CHECK_FLAG_VALUE(EXTENTS); 556 CHECK_FLAG_VALUE(VERITY); 557 CHECK_FLAG_VALUE(EA_INODE); 558 CHECK_FLAG_VALUE(INLINE_DATA); 559 CHECK_FLAG_VALUE(PROJINHERIT); 560 CHECK_FLAG_VALUE(CASEFOLD); 561 CHECK_FLAG_VALUE(RESERVED); 562 } 563 564 /* Used to pass group descriptor data when online resize is done */ 565 struct ext4_new_group_input { 566 __u32 group; /* Group number for this data */ 567 __u64 block_bitmap; /* Absolute block number of block bitmap */ 568 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 569 __u64 inode_table; /* Absolute block number of inode table start */ 570 __u32 blocks_count; /* Total number of blocks in this group */ 571 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 572 __u16 unused; 573 }; 574 575 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 576 struct compat_ext4_new_group_input { 577 u32 group; 578 compat_u64 block_bitmap; 579 compat_u64 inode_bitmap; 580 compat_u64 inode_table; 581 u32 blocks_count; 582 u16 reserved_blocks; 583 u16 unused; 584 }; 585 #endif 586 587 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 588 struct ext4_new_group_data { 589 __u32 group; 590 __u64 block_bitmap; 591 __u64 inode_bitmap; 592 __u64 inode_table; 593 __u32 blocks_count; 594 __u16 reserved_blocks; 595 __u16 mdata_blocks; 596 __u32 free_clusters_count; 597 }; 598 599 /* Indexes used to index group tables in ext4_new_group_data */ 600 enum { 601 BLOCK_BITMAP = 0, /* block bitmap */ 602 INODE_BITMAP, /* inode bitmap */ 603 INODE_TABLE, /* inode tables */ 604 GROUP_TABLE_COUNT, 605 }; 606 607 /* 608 * Flags used by ext4_map_blocks() 609 */ 610 /* Allocate any needed blocks and/or convert an unwritten 611 extent to be an initialized ext4 */ 612 #define EXT4_GET_BLOCKS_CREATE 0x0001 613 /* Request the creation of an unwritten extent */ 614 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 615 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 616 EXT4_GET_BLOCKS_CREATE) 617 /* Caller is from the delayed allocation writeout path 618 * finally doing the actual allocation of delayed blocks */ 619 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 620 /* caller is from the direct IO path, request to creation of an 621 unwritten extents if not allocated, split the unwritten 622 extent if blocks has been preallocated already*/ 623 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 624 #define EXT4_GET_BLOCKS_CONVERT 0x0010 625 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 626 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 627 /* Convert extent to initialized after IO complete */ 628 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 629 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 630 /* Eventual metadata allocation (due to growing extent tree) 631 * should not fail, so try to use reserved blocks for that.*/ 632 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 633 /* Don't normalize allocation size (used for fallocate) */ 634 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 635 /* Convert written extents to unwritten */ 636 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 637 /* Write zeros to newly created written extents */ 638 #define EXT4_GET_BLOCKS_ZERO 0x0200 639 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 640 EXT4_GET_BLOCKS_ZERO) 641 /* Caller will submit data before dropping transaction handle. This 642 * allows jbd2 to avoid submitting data before commit. */ 643 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 644 645 /* 646 * The bit position of these flags must not overlap with any of the 647 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 648 * read_extent_tree_block(), ext4_split_extent_at(), 649 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 650 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 651 * caching the extents when reading from the extent tree while a 652 * truncate or punch hole operation is in progress. 653 */ 654 #define EXT4_EX_NOCACHE 0x40000000 655 #define EXT4_EX_FORCE_CACHE 0x20000000 656 #define EXT4_EX_NOFAIL 0x10000000 657 658 /* 659 * Flags used by ext4_free_blocks 660 */ 661 #define EXT4_FREE_BLOCKS_METADATA 0x0001 662 #define EXT4_FREE_BLOCKS_FORGET 0x0002 663 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 664 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 665 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 666 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 667 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040 668 669 /* 670 * ioctl commands 671 */ 672 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 673 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 674 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 675 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 676 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 677 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 678 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 679 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 680 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 681 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 682 #define EXT4_IOC_MIGRATE _IO('f', 9) 683 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 684 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 685 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 686 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 687 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 688 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 689 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 690 #define EXT4_IOC_SET_ENCRYPTION_POLICY FS_IOC_SET_ENCRYPTION_POLICY 691 #define EXT4_IOC_GET_ENCRYPTION_PWSALT FS_IOC_GET_ENCRYPTION_PWSALT 692 #define EXT4_IOC_GET_ENCRYPTION_POLICY FS_IOC_GET_ENCRYPTION_POLICY 693 /* ioctl codes 19--39 are reserved for fscrypt */ 694 #define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40) 695 #define EXT4_IOC_GETSTATE _IOW('f', 41, __u32) 696 #define EXT4_IOC_GET_ES_CACHE _IOWR('f', 42, struct fiemap) 697 698 #define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR 699 #define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR 700 701 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32) 702 703 /* 704 * Flags for going down operation 705 */ 706 #define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */ 707 #define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */ 708 #define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */ 709 710 /* 711 * Flags returned by EXT4_IOC_GETSTATE 712 * 713 * We only expose to userspace a subset of the state flags in 714 * i_state_flags 715 */ 716 #define EXT4_STATE_FLAG_EXT_PRECACHED 0x00000001 717 #define EXT4_STATE_FLAG_NEW 0x00000002 718 #define EXT4_STATE_FLAG_NEWENTRY 0x00000004 719 #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE 0x00000008 720 721 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 722 /* 723 * ioctl commands in 32 bit emulation 724 */ 725 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 726 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 727 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 728 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 729 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 730 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 731 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 732 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 733 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 734 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 735 #endif 736 737 /* 738 * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag. 739 * It indicates that the entry in extent status cache is for a hole. 740 */ 741 #define EXT4_FIEMAP_EXTENT_HOLE 0x08000000 742 743 /* Max physical block we can address w/o extents */ 744 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 745 746 /* Max logical block we can support */ 747 #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE 748 749 /* 750 * Structure of an inode on the disk 751 */ 752 struct ext4_inode { 753 __le16 i_mode; /* File mode */ 754 __le16 i_uid; /* Low 16 bits of Owner Uid */ 755 __le32 i_size_lo; /* Size in bytes */ 756 __le32 i_atime; /* Access time */ 757 __le32 i_ctime; /* Inode Change time */ 758 __le32 i_mtime; /* Modification time */ 759 __le32 i_dtime; /* Deletion Time */ 760 __le16 i_gid; /* Low 16 bits of Group Id */ 761 __le16 i_links_count; /* Links count */ 762 __le32 i_blocks_lo; /* Blocks count */ 763 __le32 i_flags; /* File flags */ 764 union { 765 struct { 766 __le32 l_i_version; 767 } linux1; 768 struct { 769 __u32 h_i_translator; 770 } hurd1; 771 struct { 772 __u32 m_i_reserved1; 773 } masix1; 774 } osd1; /* OS dependent 1 */ 775 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 776 __le32 i_generation; /* File version (for NFS) */ 777 __le32 i_file_acl_lo; /* File ACL */ 778 __le32 i_size_high; 779 __le32 i_obso_faddr; /* Obsoleted fragment address */ 780 union { 781 struct { 782 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 783 __le16 l_i_file_acl_high; 784 __le16 l_i_uid_high; /* these 2 fields */ 785 __le16 l_i_gid_high; /* were reserved2[0] */ 786 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 787 __le16 l_i_reserved; 788 } linux2; 789 struct { 790 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 791 __u16 h_i_mode_high; 792 __u16 h_i_uid_high; 793 __u16 h_i_gid_high; 794 __u32 h_i_author; 795 } hurd2; 796 struct { 797 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 798 __le16 m_i_file_acl_high; 799 __u32 m_i_reserved2[2]; 800 } masix2; 801 } osd2; /* OS dependent 2 */ 802 __le16 i_extra_isize; 803 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 804 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 805 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 806 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 807 __le32 i_crtime; /* File Creation time */ 808 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 809 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 810 __le32 i_projid; /* Project ID */ 811 }; 812 813 struct move_extent { 814 __u32 reserved; /* should be zero */ 815 __u32 donor_fd; /* donor file descriptor */ 816 __u64 orig_start; /* logical start offset in block for orig */ 817 __u64 donor_start; /* logical start offset in block for donor */ 818 __u64 len; /* block length to be moved */ 819 __u64 moved_len; /* moved block length */ 820 }; 821 822 #define EXT4_EPOCH_BITS 2 823 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 824 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 825 826 /* 827 * Extended fields will fit into an inode if the filesystem was formatted 828 * with large inodes (-I 256 or larger) and there are not currently any EAs 829 * consuming all of the available space. For new inodes we always reserve 830 * enough space for the kernel's known extended fields, but for inodes 831 * created with an old kernel this might not have been the case. None of 832 * the extended inode fields is critical for correct filesystem operation. 833 * This macro checks if a certain field fits in the inode. Note that 834 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 835 */ 836 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 837 ((offsetof(typeof(*ext4_inode), field) + \ 838 sizeof((ext4_inode)->field)) \ 839 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 840 (einode)->i_extra_isize)) \ 841 842 /* 843 * We use an encoding that preserves the times for extra epoch "00": 844 * 845 * extra msb of adjust for signed 846 * epoch 32-bit 32-bit tv_sec to 847 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 848 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 849 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 850 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 851 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 852 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 853 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 854 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 855 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 856 * 857 * Note that previous versions of the kernel on 64-bit systems would 858 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 859 * 1970. e2fsck will correct this, assuming that it is run on the 860 * affected filesystem before 2242. 861 */ 862 863 static inline __le32 ext4_encode_extra_time(struct timespec64 *time) 864 { 865 u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK; 866 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); 867 } 868 869 static inline void ext4_decode_extra_time(struct timespec64 *time, 870 __le32 extra) 871 { 872 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) 873 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 874 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 875 } 876 877 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 878 do { \ 879 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\ 880 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 881 (raw_inode)->xtime ## _extra = \ 882 ext4_encode_extra_time(&(inode)->xtime); \ 883 } \ 884 else \ 885 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX)); \ 886 } while (0) 887 888 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 889 do { \ 890 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 891 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 892 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 893 (raw_inode)->xtime ## _extra = \ 894 ext4_encode_extra_time(&(einode)->xtime); \ 895 } while (0) 896 897 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 898 do { \ 899 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 900 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \ 901 ext4_decode_extra_time(&(inode)->xtime, \ 902 raw_inode->xtime ## _extra); \ 903 } \ 904 else \ 905 (inode)->xtime.tv_nsec = 0; \ 906 } while (0) 907 908 909 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 910 do { \ 911 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 912 (einode)->xtime.tv_sec = \ 913 (signed)le32_to_cpu((raw_inode)->xtime); \ 914 else \ 915 (einode)->xtime.tv_sec = 0; \ 916 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 917 ext4_decode_extra_time(&(einode)->xtime, \ 918 raw_inode->xtime ## _extra); \ 919 else \ 920 (einode)->xtime.tv_nsec = 0; \ 921 } while (0) 922 923 #define i_disk_version osd1.linux1.l_i_version 924 925 #if defined(__KERNEL__) || defined(__linux__) 926 #define i_reserved1 osd1.linux1.l_i_reserved1 927 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 928 #define i_blocks_high osd2.linux2.l_i_blocks_high 929 #define i_uid_low i_uid 930 #define i_gid_low i_gid 931 #define i_uid_high osd2.linux2.l_i_uid_high 932 #define i_gid_high osd2.linux2.l_i_gid_high 933 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 934 935 #elif defined(__GNU__) 936 937 #define i_translator osd1.hurd1.h_i_translator 938 #define i_uid_high osd2.hurd2.h_i_uid_high 939 #define i_gid_high osd2.hurd2.h_i_gid_high 940 #define i_author osd2.hurd2.h_i_author 941 942 #elif defined(__masix__) 943 944 #define i_reserved1 osd1.masix1.m_i_reserved1 945 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 946 #define i_reserved2 osd2.masix2.m_i_reserved2 947 948 #endif /* defined(__KERNEL__) || defined(__linux__) */ 949 950 #include "extents_status.h" 951 952 /* 953 * Lock subclasses for i_data_sem in the ext4_inode_info structure. 954 * 955 * These are needed to avoid lockdep false positives when we need to 956 * allocate blocks to the quota inode during ext4_map_blocks(), while 957 * holding i_data_sem for a normal (non-quota) inode. Since we don't 958 * do quota tracking for the quota inode, this avoids deadlock (as 959 * well as infinite recursion, since it isn't turtles all the way 960 * down...) 961 * 962 * I_DATA_SEM_NORMAL - Used for most inodes 963 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode 964 * where the second inode has larger inode number 965 * than the first 966 * I_DATA_SEM_QUOTA - Used for quota inodes only 967 */ 968 enum { 969 I_DATA_SEM_NORMAL = 0, 970 I_DATA_SEM_OTHER, 971 I_DATA_SEM_QUOTA, 972 }; 973 974 975 /* 976 * fourth extended file system inode data in memory 977 */ 978 struct ext4_inode_info { 979 __le32 i_data[15]; /* unconverted */ 980 __u32 i_dtime; 981 ext4_fsblk_t i_file_acl; 982 983 /* 984 * i_block_group is the number of the block group which contains 985 * this file's inode. Constant across the lifetime of the inode, 986 * it is used for making block allocation decisions - we try to 987 * place a file's data blocks near its inode block, and new inodes 988 * near to their parent directory's inode. 989 */ 990 ext4_group_t i_block_group; 991 ext4_lblk_t i_dir_start_lookup; 992 #if (BITS_PER_LONG < 64) 993 unsigned long i_state_flags; /* Dynamic state flags */ 994 #endif 995 unsigned long i_flags; 996 997 /* 998 * Extended attributes can be read independently of the main file 999 * data. Taking i_mutex even when reading would cause contention 1000 * between readers of EAs and writers of regular file data, so 1001 * instead we synchronize on xattr_sem when reading or changing 1002 * EAs. 1003 */ 1004 struct rw_semaphore xattr_sem; 1005 1006 struct list_head i_orphan; /* unlinked but open inodes */ 1007 1008 /* 1009 * i_disksize keeps track of what the inode size is ON DISK, not 1010 * in memory. During truncate, i_size is set to the new size by 1011 * the VFS prior to calling ext4_truncate(), but the filesystem won't 1012 * set i_disksize to 0 until the truncate is actually under way. 1013 * 1014 * The intent is that i_disksize always represents the blocks which 1015 * are used by this file. This allows recovery to restart truncate 1016 * on orphans if we crash during truncate. We actually write i_disksize 1017 * into the on-disk inode when writing inodes out, instead of i_size. 1018 * 1019 * The only time when i_disksize and i_size may be different is when 1020 * a truncate is in progress. The only things which change i_disksize 1021 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 1022 */ 1023 loff_t i_disksize; 1024 1025 /* 1026 * i_data_sem is for serialising ext4_truncate() against 1027 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 1028 * data tree are chopped off during truncate. We can't do that in 1029 * ext4 because whenever we perform intermediate commits during 1030 * truncate, the inode and all the metadata blocks *must* be in a 1031 * consistent state which allows truncation of the orphans to restart 1032 * during recovery. Hence we must fix the get_block-vs-truncate race 1033 * by other means, so we have i_data_sem. 1034 */ 1035 struct rw_semaphore i_data_sem; 1036 /* 1037 * i_mmap_sem is for serializing page faults with truncate / punch hole 1038 * operations. We have to make sure that new page cannot be faulted in 1039 * a section of the inode that is being punched. We cannot easily use 1040 * i_data_sem for this since we need protection for the whole punch 1041 * operation and i_data_sem ranks below transaction start so we have 1042 * to occasionally drop it. 1043 */ 1044 struct rw_semaphore i_mmap_sem; 1045 struct inode vfs_inode; 1046 struct jbd2_inode *jinode; 1047 1048 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 1049 1050 /* 1051 * File creation time. Its function is same as that of 1052 * struct timespec64 i_{a,c,m}time in the generic inode. 1053 */ 1054 struct timespec64 i_crtime; 1055 1056 /* mballoc */ 1057 struct list_head i_prealloc_list; 1058 spinlock_t i_prealloc_lock; 1059 1060 /* extents status tree */ 1061 struct ext4_es_tree i_es_tree; 1062 rwlock_t i_es_lock; 1063 struct list_head i_es_list; 1064 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1065 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1066 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1067 extents to shrink. Protected by 1068 i_es_lock */ 1069 1070 /* ialloc */ 1071 ext4_group_t i_last_alloc_group; 1072 1073 /* allocation reservation info for delalloc */ 1074 /* In case of bigalloc, this refer to clusters rather than blocks */ 1075 unsigned int i_reserved_data_blocks; 1076 1077 /* pending cluster reservations for bigalloc file systems */ 1078 struct ext4_pending_tree i_pending_tree; 1079 1080 /* on-disk additional length */ 1081 __u16 i_extra_isize; 1082 1083 /* Indicate the inline data space. */ 1084 u16 i_inline_off; 1085 u16 i_inline_size; 1086 1087 #ifdef CONFIG_QUOTA 1088 /* quota space reservation, managed internally by quota code */ 1089 qsize_t i_reserved_quota; 1090 #endif 1091 1092 /* Lock protecting lists below */ 1093 spinlock_t i_completed_io_lock; 1094 /* 1095 * Completed IOs that need unwritten extents handling and have 1096 * transaction reserved 1097 */ 1098 struct list_head i_rsv_conversion_list; 1099 struct work_struct i_rsv_conversion_work; 1100 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 1101 1102 spinlock_t i_block_reservation_lock; 1103 1104 /* 1105 * Transactions that contain inode's metadata needed to complete 1106 * fsync and fdatasync, respectively. 1107 */ 1108 tid_t i_sync_tid; 1109 tid_t i_datasync_tid; 1110 1111 #ifdef CONFIG_QUOTA 1112 struct dquot *i_dquot[MAXQUOTAS]; 1113 #endif 1114 1115 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1116 __u32 i_csum_seed; 1117 1118 kprojid_t i_projid; 1119 }; 1120 1121 /* 1122 * File system states 1123 */ 1124 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1125 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1126 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1127 1128 /* 1129 * Misc. filesystem flags 1130 */ 1131 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1132 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1133 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1134 1135 /* 1136 * Mount flags set via mount options or defaults 1137 */ 1138 #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */ 1139 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1140 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1141 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1142 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1143 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1144 #define EXT4_MOUNT_ERRORS_MASK 0x00070 1145 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1146 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1147 #ifdef CONFIG_FS_DAX 1148 #define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */ 1149 #else 1150 #define EXT4_MOUNT_DAX_ALWAYS 0 1151 #endif 1152 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1153 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1154 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1155 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1156 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1157 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1158 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1159 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1160 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1161 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1162 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */ 1163 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota, 1164 * enable enforcement for hidden 1165 * quota files */ 1166 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable 1167 * enforcement for hidden quota 1168 * files */ 1169 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota 1170 * enforcement */ 1171 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1172 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1173 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1174 #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */ 1175 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1176 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1177 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1178 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1179 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1180 1181 /* 1182 * Mount flags set either automatically (could not be set by mount option) 1183 * based on per file system feature or property or in special cases such as 1184 * distinguishing between explicit mount option definition and default. 1185 */ 1186 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1187 specified delalloc */ 1188 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1189 size of blocksize * 8 1190 blocks */ 1191 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1192 file systems */ 1193 #define EXT4_MOUNT2_DAX_NEVER 0x00000008 /* Do not allow Direct Access */ 1194 #define EXT4_MOUNT2_DAX_INODE 0x00000010 /* For printing options only */ 1195 1196 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1197 specified journal checksum */ 1198 1199 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1200 ~EXT4_MOUNT_##opt 1201 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1202 EXT4_MOUNT_##opt 1203 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1204 EXT4_MOUNT_##opt) 1205 1206 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1207 ~EXT4_MOUNT2_##opt 1208 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1209 EXT4_MOUNT2_##opt 1210 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1211 EXT4_MOUNT2_##opt) 1212 1213 #define ext4_test_and_set_bit __test_and_set_bit_le 1214 #define ext4_set_bit __set_bit_le 1215 #define ext4_set_bit_atomic ext2_set_bit_atomic 1216 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1217 #define ext4_clear_bit __clear_bit_le 1218 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1219 #define ext4_test_bit test_bit_le 1220 #define ext4_find_next_zero_bit find_next_zero_bit_le 1221 #define ext4_find_next_bit find_next_bit_le 1222 1223 extern void ext4_set_bits(void *bm, int cur, int len); 1224 1225 /* 1226 * Maximal mount counts between two filesystem checks 1227 */ 1228 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1229 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1230 1231 /* 1232 * Behaviour when detecting errors 1233 */ 1234 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1235 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1236 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1237 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1238 1239 /* Metadata checksum algorithm codes */ 1240 #define EXT4_CRC32C_CHKSUM 1 1241 1242 /* 1243 * Structure of the super block 1244 */ 1245 struct ext4_super_block { 1246 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1247 __le32 s_blocks_count_lo; /* Blocks count */ 1248 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1249 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1250 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1251 __le32 s_first_data_block; /* First Data Block */ 1252 __le32 s_log_block_size; /* Block size */ 1253 __le32 s_log_cluster_size; /* Allocation cluster size */ 1254 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1255 __le32 s_clusters_per_group; /* # Clusters per group */ 1256 __le32 s_inodes_per_group; /* # Inodes per group */ 1257 __le32 s_mtime; /* Mount time */ 1258 /*30*/ __le32 s_wtime; /* Write time */ 1259 __le16 s_mnt_count; /* Mount count */ 1260 __le16 s_max_mnt_count; /* Maximal mount count */ 1261 __le16 s_magic; /* Magic signature */ 1262 __le16 s_state; /* File system state */ 1263 __le16 s_errors; /* Behaviour when detecting errors */ 1264 __le16 s_minor_rev_level; /* minor revision level */ 1265 /*40*/ __le32 s_lastcheck; /* time of last check */ 1266 __le32 s_checkinterval; /* max. time between checks */ 1267 __le32 s_creator_os; /* OS */ 1268 __le32 s_rev_level; /* Revision level */ 1269 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1270 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1271 /* 1272 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1273 * 1274 * Note: the difference between the compatible feature set and 1275 * the incompatible feature set is that if there is a bit set 1276 * in the incompatible feature set that the kernel doesn't 1277 * know about, it should refuse to mount the filesystem. 1278 * 1279 * e2fsck's requirements are more strict; if it doesn't know 1280 * about a feature in either the compatible or incompatible 1281 * feature set, it must abort and not try to meddle with 1282 * things it doesn't understand... 1283 */ 1284 __le32 s_first_ino; /* First non-reserved inode */ 1285 __le16 s_inode_size; /* size of inode structure */ 1286 __le16 s_block_group_nr; /* block group # of this superblock */ 1287 __le32 s_feature_compat; /* compatible feature set */ 1288 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1289 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1290 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1291 /*78*/ char s_volume_name[16]; /* volume name */ 1292 /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */ 1293 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1294 /* 1295 * Performance hints. Directory preallocation should only 1296 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1297 */ 1298 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1299 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1300 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1301 /* 1302 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1303 */ 1304 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1305 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1306 __le32 s_journal_dev; /* device number of journal file */ 1307 __le32 s_last_orphan; /* start of list of inodes to delete */ 1308 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1309 __u8 s_def_hash_version; /* Default hash version to use */ 1310 __u8 s_jnl_backup_type; 1311 __le16 s_desc_size; /* size of group descriptor */ 1312 /*100*/ __le32 s_default_mount_opts; 1313 __le32 s_first_meta_bg; /* First metablock block group */ 1314 __le32 s_mkfs_time; /* When the filesystem was created */ 1315 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1316 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1317 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1318 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1319 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1320 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1321 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1322 __le32 s_flags; /* Miscellaneous flags */ 1323 __le16 s_raid_stride; /* RAID stride */ 1324 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1325 __le64 s_mmp_block; /* Block for multi-mount protection */ 1326 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1327 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1328 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1329 __u8 s_encryption_level; /* versioning level for encryption */ 1330 __u8 s_reserved_pad; /* Padding to next 32bits */ 1331 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1332 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1333 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1334 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1335 snapshot's future use */ 1336 __le32 s_snapshot_list; /* inode number of the head of the 1337 on-disk snapshot list */ 1338 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1339 __le32 s_error_count; /* number of fs errors */ 1340 __le32 s_first_error_time; /* first time an error happened */ 1341 __le32 s_first_error_ino; /* inode involved in first error */ 1342 __le64 s_first_error_block; /* block involved of first error */ 1343 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */ 1344 __le32 s_first_error_line; /* line number where error happened */ 1345 __le32 s_last_error_time; /* most recent time of an error */ 1346 __le32 s_last_error_ino; /* inode involved in last error */ 1347 __le32 s_last_error_line; /* line number where error happened */ 1348 __le64 s_last_error_block; /* block involved of last error */ 1349 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */ 1350 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1351 __u8 s_mount_opts[64]; 1352 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1353 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1354 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1355 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1356 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1357 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1358 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1359 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1360 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1361 __u8 s_wtime_hi; 1362 __u8 s_mtime_hi; 1363 __u8 s_mkfs_time_hi; 1364 __u8 s_lastcheck_hi; 1365 __u8 s_first_error_time_hi; 1366 __u8 s_last_error_time_hi; 1367 __u8 s_first_error_errcode; 1368 __u8 s_last_error_errcode; 1369 __le16 s_encoding; /* Filename charset encoding */ 1370 __le16 s_encoding_flags; /* Filename charset encoding flags */ 1371 __le32 s_reserved[95]; /* Padding to the end of the block */ 1372 __le32 s_checksum; /* crc32c(superblock) */ 1373 }; 1374 1375 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1376 1377 #ifdef __KERNEL__ 1378 1379 /* 1380 * run-time mount flags 1381 */ 1382 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1383 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1384 1385 #ifdef CONFIG_FS_ENCRYPTION 1386 #define DUMMY_ENCRYPTION_ENABLED(sbi) ((sbi)->s_dummy_enc_ctx.ctx != NULL) 1387 #else 1388 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0) 1389 #endif 1390 1391 /* Number of quota types we support */ 1392 #define EXT4_MAXQUOTAS 3 1393 1394 #define EXT4_ENC_UTF8_12_1 1 1395 1396 /* 1397 * Flags for ext4_sb_info.s_encoding_flags. 1398 */ 1399 #define EXT4_ENC_STRICT_MODE_FL (1 << 0) 1400 1401 #define ext4_has_strict_mode(sbi) \ 1402 (sbi->s_encoding_flags & EXT4_ENC_STRICT_MODE_FL) 1403 1404 /* 1405 * fourth extended-fs super-block data in memory 1406 */ 1407 struct ext4_sb_info { 1408 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1409 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1410 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1411 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1412 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1413 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1414 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1415 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1416 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1417 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1418 unsigned long s_overhead; /* # of fs overhead clusters */ 1419 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1420 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1421 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1422 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1423 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1424 struct buffer_head * __rcu *s_group_desc; 1425 unsigned int s_mount_opt; 1426 unsigned int s_mount_opt2; 1427 unsigned int s_mount_flags; 1428 unsigned int s_def_mount_opt; 1429 ext4_fsblk_t s_sb_block; 1430 atomic64_t s_resv_clusters; 1431 kuid_t s_resuid; 1432 kgid_t s_resgid; 1433 unsigned short s_mount_state; 1434 unsigned short s_pad; 1435 int s_addr_per_block_bits; 1436 int s_desc_per_block_bits; 1437 int s_inode_size; 1438 int s_first_ino; 1439 unsigned int s_inode_readahead_blks; 1440 unsigned int s_inode_goal; 1441 u32 s_hash_seed[4]; 1442 int s_def_hash_version; 1443 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1444 struct percpu_counter s_freeclusters_counter; 1445 struct percpu_counter s_freeinodes_counter; 1446 struct percpu_counter s_dirs_counter; 1447 struct percpu_counter s_dirtyclusters_counter; 1448 struct blockgroup_lock *s_blockgroup_lock; 1449 struct proc_dir_entry *s_proc; 1450 struct kobject s_kobj; 1451 struct completion s_kobj_unregister; 1452 struct super_block *s_sb; 1453 #ifdef CONFIG_UNICODE 1454 struct unicode_map *s_encoding; 1455 __u16 s_encoding_flags; 1456 #endif 1457 1458 /* Journaling */ 1459 struct journal_s *s_journal; 1460 struct list_head s_orphan; 1461 struct mutex s_orphan_lock; 1462 unsigned long s_ext4_flags; /* Ext4 superblock flags */ 1463 unsigned long s_commit_interval; 1464 u32 s_max_batch_time; 1465 u32 s_min_batch_time; 1466 struct block_device *journal_bdev; 1467 #ifdef CONFIG_QUOTA 1468 /* Names of quota files with journalled quota */ 1469 char __rcu *s_qf_names[EXT4_MAXQUOTAS]; 1470 int s_jquota_fmt; /* Format of quota to use */ 1471 #endif 1472 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1473 struct ext4_system_blocks __rcu *system_blks; 1474 1475 #ifdef EXTENTS_STATS 1476 /* ext4 extents stats */ 1477 unsigned long s_ext_min; 1478 unsigned long s_ext_max; 1479 unsigned long s_depth_max; 1480 spinlock_t s_ext_stats_lock; 1481 unsigned long s_ext_blocks; 1482 unsigned long s_ext_extents; 1483 #endif 1484 1485 /* for buddy allocator */ 1486 struct ext4_group_info ** __rcu *s_group_info; 1487 struct inode *s_buddy_cache; 1488 spinlock_t s_md_lock; 1489 unsigned short *s_mb_offsets; 1490 unsigned int *s_mb_maxs; 1491 unsigned int s_group_info_size; 1492 unsigned int s_mb_free_pending; 1493 struct list_head s_freed_data_list; /* List of blocks to be freed 1494 after commit completed */ 1495 1496 /* tunables */ 1497 unsigned long s_stripe; 1498 unsigned int s_mb_stream_request; 1499 unsigned int s_mb_max_to_scan; 1500 unsigned int s_mb_min_to_scan; 1501 unsigned int s_mb_stats; 1502 unsigned int s_mb_order2_reqs; 1503 unsigned int s_mb_group_prealloc; 1504 unsigned int s_max_dir_size_kb; 1505 /* where last allocation was done - for stream allocation */ 1506 unsigned long s_mb_last_group; 1507 unsigned long s_mb_last_start; 1508 1509 /* stats for buddy allocator */ 1510 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1511 atomic_t s_bal_success; /* we found long enough chunks */ 1512 atomic_t s_bal_allocated; /* in blocks */ 1513 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1514 atomic_t s_bal_goals; /* goal hits */ 1515 atomic_t s_bal_breaks; /* too long searches */ 1516 atomic_t s_bal_2orders; /* 2^order hits */ 1517 spinlock_t s_bal_lock; 1518 unsigned long s_mb_buddies_generated; 1519 unsigned long long s_mb_generation_time; 1520 atomic_t s_mb_lost_chunks; 1521 atomic_t s_mb_preallocated; 1522 atomic_t s_mb_discarded; 1523 atomic_t s_lock_busy; 1524 1525 /* locality groups */ 1526 struct ext4_locality_group __percpu *s_locality_groups; 1527 1528 /* for write statistics */ 1529 unsigned long s_sectors_written_start; 1530 u64 s_kbytes_written; 1531 1532 /* the size of zero-out chunk */ 1533 unsigned int s_extent_max_zeroout_kb; 1534 1535 unsigned int s_log_groups_per_flex; 1536 struct flex_groups * __rcu *s_flex_groups; 1537 ext4_group_t s_flex_groups_allocated; 1538 1539 /* workqueue for reserved extent conversions (buffered io) */ 1540 struct workqueue_struct *rsv_conversion_wq; 1541 1542 /* timer for periodic error stats printing */ 1543 struct timer_list s_err_report; 1544 1545 /* Lazy inode table initialization info */ 1546 struct ext4_li_request *s_li_request; 1547 /* Wait multiplier for lazy initialization thread */ 1548 unsigned int s_li_wait_mult; 1549 1550 /* Kernel thread for multiple mount protection */ 1551 struct task_struct *s_mmp_tsk; 1552 1553 /* record the last minlen when FITRIM is called. */ 1554 atomic_t s_last_trim_minblks; 1555 1556 /* Reference to checksum algorithm driver via cryptoapi */ 1557 struct crypto_shash *s_chksum_driver; 1558 1559 /* Precomputed FS UUID checksum for seeding other checksums */ 1560 __u32 s_csum_seed; 1561 1562 /* Reclaim extents from extent status tree */ 1563 struct shrinker s_es_shrinker; 1564 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1565 long s_es_nr_inode; 1566 struct ext4_es_stats s_es_stats; 1567 struct mb_cache *s_ea_block_cache; 1568 struct mb_cache *s_ea_inode_cache; 1569 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1570 1571 /* Ratelimit ext4 messages. */ 1572 struct ratelimit_state s_err_ratelimit_state; 1573 struct ratelimit_state s_warning_ratelimit_state; 1574 struct ratelimit_state s_msg_ratelimit_state; 1575 1576 /* Encryption context for '-o test_dummy_encryption' */ 1577 struct fscrypt_dummy_context s_dummy_enc_ctx; 1578 1579 /* 1580 * Barrier between writepages ops and changing any inode's JOURNAL_DATA 1581 * or EXTENTS flag. 1582 */ 1583 struct percpu_rw_semaphore s_writepages_rwsem; 1584 struct dax_device *s_daxdev; 1585 #ifdef CONFIG_EXT4_DEBUG 1586 unsigned long s_simulate_fail; 1587 #endif 1588 }; 1589 1590 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1591 { 1592 return sb->s_fs_info; 1593 } 1594 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1595 { 1596 return container_of(inode, struct ext4_inode_info, vfs_inode); 1597 } 1598 1599 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1600 { 1601 return ino == EXT4_ROOT_INO || 1602 (ino >= EXT4_FIRST_INO(sb) && 1603 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1604 } 1605 1606 /* 1607 * Returns: sbi->field[index] 1608 * Used to access an array element from the following sbi fields which require 1609 * rcu protection to avoid dereferencing an invalid pointer due to reassignment 1610 * - s_group_desc 1611 * - s_group_info 1612 * - s_flex_group 1613 */ 1614 #define sbi_array_rcu_deref(sbi, field, index) \ 1615 ({ \ 1616 typeof(*((sbi)->field)) _v; \ 1617 rcu_read_lock(); \ 1618 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \ 1619 rcu_read_unlock(); \ 1620 _v; \ 1621 }) 1622 1623 /* 1624 * Simulate_fail codes 1625 */ 1626 #define EXT4_SIM_BBITMAP_EIO 1 1627 #define EXT4_SIM_BBITMAP_CRC 2 1628 #define EXT4_SIM_IBITMAP_EIO 3 1629 #define EXT4_SIM_IBITMAP_CRC 4 1630 #define EXT4_SIM_INODE_EIO 5 1631 #define EXT4_SIM_INODE_CRC 6 1632 #define EXT4_SIM_DIRBLOCK_EIO 7 1633 #define EXT4_SIM_DIRBLOCK_CRC 8 1634 1635 static inline bool ext4_simulate_fail(struct super_block *sb, 1636 unsigned long code) 1637 { 1638 #ifdef CONFIG_EXT4_DEBUG 1639 struct ext4_sb_info *sbi = EXT4_SB(sb); 1640 1641 if (unlikely(sbi->s_simulate_fail == code)) { 1642 sbi->s_simulate_fail = 0; 1643 return true; 1644 } 1645 #endif 1646 return false; 1647 } 1648 1649 static inline void ext4_simulate_fail_bh(struct super_block *sb, 1650 struct buffer_head *bh, 1651 unsigned long code) 1652 { 1653 if (!IS_ERR(bh) && ext4_simulate_fail(sb, code)) 1654 clear_buffer_uptodate(bh); 1655 } 1656 1657 /* 1658 * Error number codes for s_{first,last}_error_errno 1659 * 1660 * Linux errno numbers are architecture specific, so we need to translate 1661 * them into something which is architecture independent. We don't define 1662 * codes for all errno's; just the ones which are most likely to be the cause 1663 * of an ext4_error() call. 1664 */ 1665 #define EXT4_ERR_UNKNOWN 1 1666 #define EXT4_ERR_EIO 2 1667 #define EXT4_ERR_ENOMEM 3 1668 #define EXT4_ERR_EFSBADCRC 4 1669 #define EXT4_ERR_EFSCORRUPTED 5 1670 #define EXT4_ERR_ENOSPC 6 1671 #define EXT4_ERR_ENOKEY 7 1672 #define EXT4_ERR_EROFS 8 1673 #define EXT4_ERR_EFBIG 9 1674 #define EXT4_ERR_EEXIST 10 1675 #define EXT4_ERR_ERANGE 11 1676 #define EXT4_ERR_EOVERFLOW 12 1677 #define EXT4_ERR_EBUSY 13 1678 #define EXT4_ERR_ENOTDIR 14 1679 #define EXT4_ERR_ENOTEMPTY 15 1680 #define EXT4_ERR_ESHUTDOWN 16 1681 #define EXT4_ERR_EFAULT 17 1682 1683 /* 1684 * Inode dynamic state flags 1685 */ 1686 enum { 1687 EXT4_STATE_JDATA, /* journaled data exists */ 1688 EXT4_STATE_NEW, /* inode is newly created */ 1689 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1690 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1691 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1692 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1693 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1694 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1695 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1696 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */ 1697 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */ 1698 }; 1699 1700 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1701 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1702 { \ 1703 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1704 } \ 1705 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1706 { \ 1707 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1708 } \ 1709 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1710 { \ 1711 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1712 } 1713 1714 /* Add these declarations here only so that these functions can be 1715 * found by name. Otherwise, they are very hard to locate. */ 1716 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1717 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1718 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1719 EXT4_INODE_BIT_FNS(flag, flags, 0) 1720 1721 /* Add these declarations here only so that these functions can be 1722 * found by name. Otherwise, they are very hard to locate. */ 1723 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1724 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1725 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1726 #if (BITS_PER_LONG < 64) 1727 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1728 1729 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1730 { 1731 (ei)->i_state_flags = 0; 1732 } 1733 #else 1734 EXT4_INODE_BIT_FNS(state, flags, 32) 1735 1736 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1737 { 1738 /* We depend on the fact that callers will set i_flags */ 1739 } 1740 #endif 1741 #else 1742 /* Assume that user mode programs are passing in an ext4fs superblock, not 1743 * a kernel struct super_block. This will allow us to call the feature-test 1744 * macros from user land. */ 1745 #define EXT4_SB(sb) (sb) 1746 #endif 1747 1748 static inline bool ext4_verity_in_progress(struct inode *inode) 1749 { 1750 return IS_ENABLED(CONFIG_FS_VERITY) && 1751 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS); 1752 } 1753 1754 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1755 1756 /* 1757 * Codes for operating systems 1758 */ 1759 #define EXT4_OS_LINUX 0 1760 #define EXT4_OS_HURD 1 1761 #define EXT4_OS_MASIX 2 1762 #define EXT4_OS_FREEBSD 3 1763 #define EXT4_OS_LITES 4 1764 1765 /* 1766 * Revision levels 1767 */ 1768 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1769 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1770 1771 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1772 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1773 1774 #define EXT4_GOOD_OLD_INODE_SIZE 128 1775 1776 #define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN) 1777 #define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX 1778 #define EXT4_TIMESTAMP_MIN S32_MIN 1779 1780 /* 1781 * Feature set definitions 1782 */ 1783 1784 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1785 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1786 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1787 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1788 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1789 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1790 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1791 #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800 1792 1793 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1794 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1795 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1796 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1797 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1798 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1799 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1800 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1801 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1802 /* 1803 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1804 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1805 * all other data structures' checksums. However, the METADATA_CSUM and 1806 * GDT_CSUM bits are mutually exclusive. 1807 */ 1808 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1809 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1810 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 1811 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000 1812 1813 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1814 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1815 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1816 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1817 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1818 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1819 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1820 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1821 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1822 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1823 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1824 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 1825 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1826 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1827 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1828 #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000 1829 1830 extern void ext4_update_dynamic_rev(struct super_block *sb); 1831 1832 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 1833 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1834 { \ 1835 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1836 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 1837 } \ 1838 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1839 { \ 1840 ext4_update_dynamic_rev(sb); \ 1841 EXT4_SB(sb)->s_es->s_feature_compat |= \ 1842 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1843 } \ 1844 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1845 { \ 1846 EXT4_SB(sb)->s_es->s_feature_compat &= \ 1847 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1848 } 1849 1850 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 1851 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1852 { \ 1853 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1854 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 1855 } \ 1856 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1857 { \ 1858 ext4_update_dynamic_rev(sb); \ 1859 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 1860 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1861 } \ 1862 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1863 { \ 1864 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 1865 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1866 } 1867 1868 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 1869 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1870 { \ 1871 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1872 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 1873 } \ 1874 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1875 { \ 1876 ext4_update_dynamic_rev(sb); \ 1877 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 1878 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1879 } \ 1880 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1881 { \ 1882 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 1883 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1884 } 1885 1886 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 1887 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 1888 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 1889 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 1890 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 1891 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 1892 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 1893 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES) 1894 1895 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 1896 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 1897 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 1898 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 1899 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 1900 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 1901 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 1902 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 1903 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 1904 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 1905 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 1906 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 1907 EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY) 1908 1909 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 1910 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 1911 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 1912 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 1913 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 1914 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 1915 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 1916 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 1917 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 1918 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 1919 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 1920 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 1921 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 1922 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 1923 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 1924 EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD) 1925 1926 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1927 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1928 EXT4_FEATURE_INCOMPAT_META_BG) 1929 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1930 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1931 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1932 1933 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1934 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1935 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1936 EXT4_FEATURE_INCOMPAT_META_BG) 1937 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1938 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1939 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1940 1941 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1942 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1943 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1944 EXT4_FEATURE_INCOMPAT_META_BG| \ 1945 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1946 EXT4_FEATURE_INCOMPAT_64BIT| \ 1947 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1948 EXT4_FEATURE_INCOMPAT_EA_INODE| \ 1949 EXT4_FEATURE_INCOMPAT_MMP | \ 1950 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 1951 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 1952 EXT4_FEATURE_INCOMPAT_CASEFOLD | \ 1953 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \ 1954 EXT4_FEATURE_INCOMPAT_LARGEDIR) 1955 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1956 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1957 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1958 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1959 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1960 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1961 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1962 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1963 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1964 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 1965 EXT4_FEATURE_RO_COMPAT_PROJECT |\ 1966 EXT4_FEATURE_RO_COMPAT_VERITY) 1967 1968 #define EXTN_FEATURE_FUNCS(ver) \ 1969 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 1970 { \ 1971 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1972 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 1973 } \ 1974 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 1975 { \ 1976 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1977 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 1978 } \ 1979 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 1980 { \ 1981 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1982 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 1983 } 1984 1985 EXTN_FEATURE_FUNCS(2) 1986 EXTN_FEATURE_FUNCS(3) 1987 EXTN_FEATURE_FUNCS(4) 1988 1989 static inline bool ext4_has_compat_features(struct super_block *sb) 1990 { 1991 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 1992 } 1993 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 1994 { 1995 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 1996 } 1997 static inline bool ext4_has_incompat_features(struct super_block *sb) 1998 { 1999 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 2000 } 2001 2002 /* 2003 * Superblock flags 2004 */ 2005 #define EXT4_FLAGS_RESIZING 0 2006 #define EXT4_FLAGS_SHUTDOWN 1 2007 #define EXT4_FLAGS_BDEV_IS_DAX 2 2008 2009 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi) 2010 { 2011 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 2012 } 2013 2014 2015 /* 2016 * Default values for user and/or group using reserved blocks 2017 */ 2018 #define EXT4_DEF_RESUID 0 2019 #define EXT4_DEF_RESGID 0 2020 2021 /* 2022 * Default project ID 2023 */ 2024 #define EXT4_DEF_PROJID 0 2025 2026 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 2027 2028 /* 2029 * Default mount options 2030 */ 2031 #define EXT4_DEFM_DEBUG 0x0001 2032 #define EXT4_DEFM_BSDGROUPS 0x0002 2033 #define EXT4_DEFM_XATTR_USER 0x0004 2034 #define EXT4_DEFM_ACL 0x0008 2035 #define EXT4_DEFM_UID16 0x0010 2036 #define EXT4_DEFM_JMODE 0x0060 2037 #define EXT4_DEFM_JMODE_DATA 0x0020 2038 #define EXT4_DEFM_JMODE_ORDERED 0x0040 2039 #define EXT4_DEFM_JMODE_WBACK 0x0060 2040 #define EXT4_DEFM_NOBARRIER 0x0100 2041 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 2042 #define EXT4_DEFM_DISCARD 0x0400 2043 #define EXT4_DEFM_NODELALLOC 0x0800 2044 2045 /* 2046 * Default journal batch times 2047 */ 2048 #define EXT4_DEF_MIN_BATCH_TIME 0 2049 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 2050 2051 /* 2052 * Minimum number of groups in a flexgroup before we separate out 2053 * directories into the first block group of a flexgroup 2054 */ 2055 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 2056 2057 /* 2058 * Structure of a directory entry 2059 */ 2060 #define EXT4_NAME_LEN 255 2061 2062 struct ext4_dir_entry { 2063 __le32 inode; /* Inode number */ 2064 __le16 rec_len; /* Directory entry length */ 2065 __le16 name_len; /* Name length */ 2066 char name[EXT4_NAME_LEN]; /* File name */ 2067 }; 2068 2069 /* 2070 * The new version of the directory entry. Since EXT4 structures are 2071 * stored in intel byte order, and the name_len field could never be 2072 * bigger than 255 chars, it's safe to reclaim the extra byte for the 2073 * file_type field. 2074 */ 2075 struct ext4_dir_entry_2 { 2076 __le32 inode; /* Inode number */ 2077 __le16 rec_len; /* Directory entry length */ 2078 __u8 name_len; /* Name length */ 2079 __u8 file_type; /* See file type macros EXT4_FT_* below */ 2080 char name[EXT4_NAME_LEN]; /* File name */ 2081 }; 2082 2083 /* 2084 * This is a bogus directory entry at the end of each leaf block that 2085 * records checksums. 2086 */ 2087 struct ext4_dir_entry_tail { 2088 __le32 det_reserved_zero1; /* Pretend to be unused */ 2089 __le16 det_rec_len; /* 12 */ 2090 __u8 det_reserved_zero2; /* Zero name length */ 2091 __u8 det_reserved_ft; /* 0xDE, fake file type */ 2092 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 2093 }; 2094 2095 #define EXT4_DIRENT_TAIL(block, blocksize) \ 2096 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 2097 ((blocksize) - \ 2098 sizeof(struct ext4_dir_entry_tail)))) 2099 2100 /* 2101 * Ext4 directory file types. Only the low 3 bits are used. The 2102 * other bits are reserved for now. 2103 */ 2104 #define EXT4_FT_UNKNOWN 0 2105 #define EXT4_FT_REG_FILE 1 2106 #define EXT4_FT_DIR 2 2107 #define EXT4_FT_CHRDEV 3 2108 #define EXT4_FT_BLKDEV 4 2109 #define EXT4_FT_FIFO 5 2110 #define EXT4_FT_SOCK 6 2111 #define EXT4_FT_SYMLINK 7 2112 2113 #define EXT4_FT_MAX 8 2114 2115 #define EXT4_FT_DIR_CSUM 0xDE 2116 2117 /* 2118 * EXT4_DIR_PAD defines the directory entries boundaries 2119 * 2120 * NOTE: It must be a multiple of 4 2121 */ 2122 #define EXT4_DIR_PAD 4 2123 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 2124 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 2125 ~EXT4_DIR_ROUND) 2126 #define EXT4_MAX_REC_LEN ((1<<16)-1) 2127 2128 /* 2129 * If we ever get support for fs block sizes > page_size, we'll need 2130 * to remove the #if statements in the next two functions... 2131 */ 2132 static inline unsigned int 2133 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 2134 { 2135 unsigned len = le16_to_cpu(dlen); 2136 2137 #if (PAGE_SIZE >= 65536) 2138 if (len == EXT4_MAX_REC_LEN || len == 0) 2139 return blocksize; 2140 return (len & 65532) | ((len & 3) << 16); 2141 #else 2142 return len; 2143 #endif 2144 } 2145 2146 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 2147 { 2148 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 2149 BUG(); 2150 #if (PAGE_SIZE >= 65536) 2151 if (len < 65536) 2152 return cpu_to_le16(len); 2153 if (len == blocksize) { 2154 if (blocksize == 65536) 2155 return cpu_to_le16(EXT4_MAX_REC_LEN); 2156 else 2157 return cpu_to_le16(0); 2158 } 2159 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 2160 #else 2161 return cpu_to_le16(len); 2162 #endif 2163 } 2164 2165 /* 2166 * Hash Tree Directory indexing 2167 * (c) Daniel Phillips, 2001 2168 */ 2169 2170 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2171 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2172 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \ 2173 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir))) 2174 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2175 2176 /* Legal values for the dx_root hash_version field: */ 2177 2178 #define DX_HASH_LEGACY 0 2179 #define DX_HASH_HALF_MD4 1 2180 #define DX_HASH_TEA 2 2181 #define DX_HASH_LEGACY_UNSIGNED 3 2182 #define DX_HASH_HALF_MD4_UNSIGNED 4 2183 #define DX_HASH_TEA_UNSIGNED 5 2184 2185 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 2186 const void *address, unsigned int length) 2187 { 2188 struct { 2189 struct shash_desc shash; 2190 char ctx[4]; 2191 } desc; 2192 2193 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2194 2195 desc.shash.tfm = sbi->s_chksum_driver; 2196 *(u32 *)desc.ctx = crc; 2197 2198 BUG_ON(crypto_shash_update(&desc.shash, address, length)); 2199 2200 return *(u32 *)desc.ctx; 2201 } 2202 2203 #ifdef __KERNEL__ 2204 2205 /* hash info structure used by the directory hash */ 2206 struct dx_hash_info 2207 { 2208 u32 hash; 2209 u32 minor_hash; 2210 int hash_version; 2211 u32 *seed; 2212 }; 2213 2214 2215 /* 32 and 64 bit signed EOF for dx directories */ 2216 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2217 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2218 2219 2220 /* 2221 * Control parameters used by ext4_htree_next_block 2222 */ 2223 #define HASH_NB_ALWAYS 1 2224 2225 struct ext4_filename { 2226 const struct qstr *usr_fname; 2227 struct fscrypt_str disk_name; 2228 struct dx_hash_info hinfo; 2229 #ifdef CONFIG_FS_ENCRYPTION 2230 struct fscrypt_str crypto_buf; 2231 #endif 2232 #ifdef CONFIG_UNICODE 2233 struct fscrypt_str cf_name; 2234 #endif 2235 }; 2236 2237 #define fname_name(p) ((p)->disk_name.name) 2238 #define fname_len(p) ((p)->disk_name.len) 2239 2240 /* 2241 * Describe an inode's exact location on disk and in memory 2242 */ 2243 struct ext4_iloc 2244 { 2245 struct buffer_head *bh; 2246 unsigned long offset; 2247 ext4_group_t block_group; 2248 }; 2249 2250 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2251 { 2252 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2253 } 2254 2255 static inline bool ext4_is_quota_file(struct inode *inode) 2256 { 2257 return IS_NOQUOTA(inode) && 2258 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL); 2259 } 2260 2261 /* 2262 * This structure is stuffed into the struct file's private_data field 2263 * for directories. It is where we put information so that we can do 2264 * readdir operations in hash tree order. 2265 */ 2266 struct dir_private_info { 2267 struct rb_root root; 2268 struct rb_node *curr_node; 2269 struct fname *extra_fname; 2270 loff_t last_pos; 2271 __u32 curr_hash; 2272 __u32 curr_minor_hash; 2273 __u32 next_hash; 2274 }; 2275 2276 /* calculate the first block number of the group */ 2277 static inline ext4_fsblk_t 2278 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2279 { 2280 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2281 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2282 } 2283 2284 /* 2285 * Special error return code only used by dx_probe() and its callers. 2286 */ 2287 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2288 2289 /* htree levels for ext4 */ 2290 #define EXT4_HTREE_LEVEL_COMPAT 2 2291 #define EXT4_HTREE_LEVEL 3 2292 2293 static inline int ext4_dir_htree_level(struct super_block *sb) 2294 { 2295 return ext4_has_feature_largedir(sb) ? 2296 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT; 2297 } 2298 2299 /* 2300 * Timeout and state flag for lazy initialization inode thread. 2301 */ 2302 #define EXT4_DEF_LI_WAIT_MULT 10 2303 #define EXT4_DEF_LI_MAX_START_DELAY 5 2304 #define EXT4_LAZYINIT_QUIT 0x0001 2305 #define EXT4_LAZYINIT_RUNNING 0x0002 2306 2307 /* 2308 * Lazy inode table initialization info 2309 */ 2310 struct ext4_lazy_init { 2311 unsigned long li_state; 2312 struct list_head li_request_list; 2313 struct mutex li_list_mtx; 2314 }; 2315 2316 struct ext4_li_request { 2317 struct super_block *lr_super; 2318 struct ext4_sb_info *lr_sbi; 2319 ext4_group_t lr_next_group; 2320 struct list_head lr_request; 2321 unsigned long lr_next_sched; 2322 unsigned long lr_timeout; 2323 }; 2324 2325 struct ext4_features { 2326 struct kobject f_kobj; 2327 struct completion f_kobj_unregister; 2328 }; 2329 2330 /* 2331 * This structure will be used for multiple mount protection. It will be 2332 * written into the block number saved in the s_mmp_block field in the 2333 * superblock. Programs that check MMP should assume that if 2334 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2335 * to use the filesystem, regardless of how old the timestamp is. 2336 */ 2337 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2338 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2339 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2340 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2341 2342 struct mmp_struct { 2343 __le32 mmp_magic; /* Magic number for MMP */ 2344 __le32 mmp_seq; /* Sequence no. updated periodically */ 2345 2346 /* 2347 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2348 * purposes and do not affect the correctness of the algorithm 2349 */ 2350 __le64 mmp_time; /* Time last updated */ 2351 char mmp_nodename[64]; /* Node which last updated MMP block */ 2352 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2353 2354 /* 2355 * mmp_check_interval is used to verify if the MMP block has been 2356 * updated on the block device. The value is updated based on the 2357 * maximum time to write the MMP block during an update cycle. 2358 */ 2359 __le16 mmp_check_interval; 2360 2361 __le16 mmp_pad1; 2362 __le32 mmp_pad2[226]; 2363 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2364 }; 2365 2366 /* arguments passed to the mmp thread */ 2367 struct mmpd_data { 2368 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2369 struct super_block *sb; /* super block of the fs */ 2370 }; 2371 2372 /* 2373 * Check interval multiplier 2374 * The MMP block is written every update interval and initially checked every 2375 * update interval x the multiplier (the value is then adapted based on the 2376 * write latency). The reason is that writes can be delayed under load and we 2377 * don't want readers to incorrectly assume that the filesystem is no longer 2378 * in use. 2379 */ 2380 #define EXT4_MMP_CHECK_MULT 2UL 2381 2382 /* 2383 * Minimum interval for MMP checking in seconds. 2384 */ 2385 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2386 2387 /* 2388 * Maximum interval for MMP checking in seconds. 2389 */ 2390 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2391 2392 /* 2393 * Function prototypes 2394 */ 2395 2396 /* 2397 * Ok, these declarations are also in <linux/kernel.h> but none of the 2398 * ext4 source programs needs to include it so they are duplicated here. 2399 */ 2400 # define NORET_TYPE /**/ 2401 # define ATTRIB_NORET __attribute__((noreturn)) 2402 # define NORET_AND noreturn, 2403 2404 /* bitmap.c */ 2405 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2406 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2407 struct ext4_group_desc *gdp, 2408 struct buffer_head *bh, int sz); 2409 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2410 struct ext4_group_desc *gdp, 2411 struct buffer_head *bh, int sz); 2412 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2413 struct ext4_group_desc *gdp, 2414 struct buffer_head *bh); 2415 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2416 struct ext4_group_desc *gdp, 2417 struct buffer_head *bh); 2418 2419 /* balloc.c */ 2420 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2421 ext4_fsblk_t blocknr, 2422 ext4_group_t *blockgrpp, 2423 ext4_grpblk_t *offsetp); 2424 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2425 ext4_fsblk_t block); 2426 2427 extern unsigned int ext4_block_group(struct super_block *sb, 2428 ext4_fsblk_t blocknr); 2429 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2430 ext4_fsblk_t blocknr); 2431 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2432 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2433 ext4_group_t group); 2434 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2435 ext4_fsblk_t goal, 2436 unsigned int flags, 2437 unsigned long *count, 2438 int *errp); 2439 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2440 s64 nclusters, unsigned int flags); 2441 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2442 extern void ext4_check_blocks_bitmap(struct super_block *); 2443 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2444 ext4_group_t block_group, 2445 struct buffer_head ** bh); 2446 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2447 2448 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2449 ext4_group_t block_group); 2450 extern int ext4_wait_block_bitmap(struct super_block *sb, 2451 ext4_group_t block_group, 2452 struct buffer_head *bh); 2453 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2454 ext4_group_t block_group); 2455 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2456 ext4_group_t block_group, 2457 struct ext4_group_desc *gdp); 2458 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2459 2460 #ifdef CONFIG_UNICODE 2461 extern void ext4_fname_setup_ci_filename(struct inode *dir, 2462 const struct qstr *iname, 2463 struct fscrypt_str *fname); 2464 #endif 2465 2466 #ifdef CONFIG_FS_ENCRYPTION 2467 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst, 2468 const struct fscrypt_name *src) 2469 { 2470 memset(dst, 0, sizeof(*dst)); 2471 2472 dst->usr_fname = src->usr_fname; 2473 dst->disk_name = src->disk_name; 2474 dst->hinfo.hash = src->hash; 2475 dst->hinfo.minor_hash = src->minor_hash; 2476 dst->crypto_buf = src->crypto_buf; 2477 } 2478 2479 static inline int ext4_fname_setup_filename(struct inode *dir, 2480 const struct qstr *iname, 2481 int lookup, 2482 struct ext4_filename *fname) 2483 { 2484 struct fscrypt_name name; 2485 int err; 2486 2487 err = fscrypt_setup_filename(dir, iname, lookup, &name); 2488 if (err) 2489 return err; 2490 2491 ext4_fname_from_fscrypt_name(fname, &name); 2492 2493 #ifdef CONFIG_UNICODE 2494 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name); 2495 #endif 2496 return 0; 2497 } 2498 2499 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2500 struct dentry *dentry, 2501 struct ext4_filename *fname) 2502 { 2503 struct fscrypt_name name; 2504 int err; 2505 2506 err = fscrypt_prepare_lookup(dir, dentry, &name); 2507 if (err) 2508 return err; 2509 2510 ext4_fname_from_fscrypt_name(fname, &name); 2511 2512 #ifdef CONFIG_UNICODE 2513 ext4_fname_setup_ci_filename(dir, &dentry->d_name, &fname->cf_name); 2514 #endif 2515 return 0; 2516 } 2517 2518 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2519 { 2520 struct fscrypt_name name; 2521 2522 name.crypto_buf = fname->crypto_buf; 2523 fscrypt_free_filename(&name); 2524 2525 fname->crypto_buf.name = NULL; 2526 fname->usr_fname = NULL; 2527 fname->disk_name.name = NULL; 2528 2529 #ifdef CONFIG_UNICODE 2530 kfree(fname->cf_name.name); 2531 fname->cf_name.name = NULL; 2532 #endif 2533 } 2534 #else /* !CONFIG_FS_ENCRYPTION */ 2535 static inline int ext4_fname_setup_filename(struct inode *dir, 2536 const struct qstr *iname, 2537 int lookup, 2538 struct ext4_filename *fname) 2539 { 2540 fname->usr_fname = iname; 2541 fname->disk_name.name = (unsigned char *) iname->name; 2542 fname->disk_name.len = iname->len; 2543 2544 #ifdef CONFIG_UNICODE 2545 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name); 2546 #endif 2547 2548 return 0; 2549 } 2550 2551 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2552 struct dentry *dentry, 2553 struct ext4_filename *fname) 2554 { 2555 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname); 2556 } 2557 2558 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2559 { 2560 #ifdef CONFIG_UNICODE 2561 kfree(fname->cf_name.name); 2562 fname->cf_name.name = NULL; 2563 #endif 2564 } 2565 #endif /* !CONFIG_FS_ENCRYPTION */ 2566 2567 /* dir.c */ 2568 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2569 struct file *, 2570 struct ext4_dir_entry_2 *, 2571 struct buffer_head *, char *, int, 2572 unsigned int); 2573 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2574 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2575 (de), (bh), (buf), (size), (offset))) 2576 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2577 __u32 minor_hash, 2578 struct ext4_dir_entry_2 *dirent, 2579 struct fscrypt_str *ent_name); 2580 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2581 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2582 struct buffer_head *bh, 2583 void *buf, int buf_size, 2584 struct ext4_filename *fname, 2585 struct ext4_dir_entry_2 **dest_de); 2586 void ext4_insert_dentry(struct inode *inode, 2587 struct ext4_dir_entry_2 *de, 2588 int buf_size, 2589 struct ext4_filename *fname); 2590 static inline void ext4_update_dx_flag(struct inode *inode) 2591 { 2592 if (!ext4_has_feature_dir_index(inode->i_sb)) { 2593 /* ext4_iget() should have caught this... */ 2594 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb)); 2595 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2596 } 2597 } 2598 static const unsigned char ext4_filetype_table[] = { 2599 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2600 }; 2601 2602 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2603 { 2604 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2605 return DT_UNKNOWN; 2606 2607 return ext4_filetype_table[filetype]; 2608 } 2609 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2610 void *buf, int buf_size); 2611 2612 /* fsync.c */ 2613 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2614 2615 /* hash.c */ 2616 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len, 2617 struct dx_hash_info *hinfo); 2618 2619 /* ialloc.c */ 2620 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2621 const struct qstr *qstr, __u32 goal, 2622 uid_t *owner, __u32 i_flags, 2623 int handle_type, unsigned int line_no, 2624 int nblocks); 2625 2626 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \ 2627 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2628 i_flags, 0, 0, 0) 2629 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2630 type, nblocks) \ 2631 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2632 0, (type), __LINE__, (nblocks)) 2633 2634 2635 extern void ext4_free_inode(handle_t *, struct inode *); 2636 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2637 extern unsigned long ext4_count_free_inodes(struct super_block *); 2638 extern unsigned long ext4_count_dirs(struct super_block *); 2639 extern void ext4_check_inodes_bitmap(struct super_block *); 2640 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2641 extern int ext4_init_inode_table(struct super_block *sb, 2642 ext4_group_t group, int barrier); 2643 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2644 2645 /* mballoc.c */ 2646 extern const struct seq_operations ext4_mb_seq_groups_ops; 2647 extern long ext4_mb_stats; 2648 extern long ext4_mb_max_to_scan; 2649 extern int ext4_mb_init(struct super_block *); 2650 extern int ext4_mb_release(struct super_block *); 2651 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2652 struct ext4_allocation_request *, int *); 2653 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2654 extern void ext4_discard_preallocations(struct inode *); 2655 extern int __init ext4_init_mballoc(void); 2656 extern void ext4_exit_mballoc(void); 2657 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2658 struct buffer_head *bh, ext4_fsblk_t block, 2659 unsigned long count, int flags); 2660 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2661 ext4_group_t ngroups); 2662 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2663 ext4_group_t i, struct ext4_group_desc *desc); 2664 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2665 ext4_fsblk_t block, unsigned long count); 2666 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2667 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid); 2668 2669 /* inode.c */ 2670 int ext4_inode_is_fast_symlink(struct inode *inode); 2671 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2672 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2673 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count, 2674 bool wait, struct buffer_head **bhs); 2675 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2676 struct buffer_head *bh_result, int create); 2677 int ext4_get_block(struct inode *inode, sector_t iblock, 2678 struct buffer_head *bh_result, int create); 2679 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2680 struct buffer_head *bh, int create); 2681 int ext4_walk_page_buffers(handle_t *handle, 2682 struct buffer_head *head, 2683 unsigned from, 2684 unsigned to, 2685 int *partial, 2686 int (*fn)(handle_t *handle, 2687 struct buffer_head *bh)); 2688 int do_journal_get_write_access(handle_t *handle, 2689 struct buffer_head *bh); 2690 #define FALL_BACK_TO_NONDELALLOC 1 2691 #define CONVERT_INLINE_DATA 2 2692 2693 typedef enum { 2694 EXT4_IGET_NORMAL = 0, 2695 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */ 2696 EXT4_IGET_HANDLE = 0x0002 /* Inode # is from a handle */ 2697 } ext4_iget_flags; 2698 2699 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, 2700 ext4_iget_flags flags, const char *function, 2701 unsigned int line); 2702 2703 #define ext4_iget(sb, ino, flags) \ 2704 __ext4_iget((sb), (ino), (flags), __func__, __LINE__) 2705 2706 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2707 extern int ext4_setattr(struct dentry *, struct iattr *); 2708 extern int ext4_getattr(const struct path *, struct kstat *, u32, unsigned int); 2709 extern void ext4_evict_inode(struct inode *); 2710 extern void ext4_clear_inode(struct inode *); 2711 extern int ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int); 2712 extern int ext4_sync_inode(handle_t *, struct inode *); 2713 extern void ext4_dirty_inode(struct inode *, int); 2714 extern int ext4_change_inode_journal_flag(struct inode *, int); 2715 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2716 extern int ext4_inode_attach_jinode(struct inode *inode); 2717 extern int ext4_can_truncate(struct inode *inode); 2718 extern int ext4_truncate(struct inode *); 2719 extern int ext4_break_layouts(struct inode *); 2720 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2721 extern void ext4_set_inode_flags(struct inode *, bool init); 2722 extern int ext4_alloc_da_blocks(struct inode *inode); 2723 extern void ext4_set_aops(struct inode *inode); 2724 extern int ext4_writepage_trans_blocks(struct inode *); 2725 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2726 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2727 loff_t lstart, loff_t lend); 2728 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf); 2729 extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf); 2730 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2731 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 2732 extern void ext4_da_release_space(struct inode *inode, int to_free); 2733 extern void ext4_da_update_reserve_space(struct inode *inode, 2734 int used, int quota_claim); 2735 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 2736 ext4_fsblk_t pblk, ext4_lblk_t len); 2737 2738 /* indirect.c */ 2739 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2740 struct ext4_map_blocks *map, int flags); 2741 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2742 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2743 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2744 ext4_lblk_t start, ext4_lblk_t end); 2745 2746 /* ioctl.c */ 2747 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2748 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2749 2750 /* migrate.c */ 2751 extern int ext4_ext_migrate(struct inode *); 2752 extern int ext4_ind_migrate(struct inode *inode); 2753 2754 /* namei.c */ 2755 extern int ext4_dirblock_csum_verify(struct inode *inode, 2756 struct buffer_head *bh); 2757 extern int ext4_orphan_add(handle_t *, struct inode *); 2758 extern int ext4_orphan_del(handle_t *, struct inode *); 2759 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2760 __u32 start_minor_hash, __u32 *next_hash); 2761 extern int ext4_search_dir(struct buffer_head *bh, 2762 char *search_buf, 2763 int buf_size, 2764 struct inode *dir, 2765 struct ext4_filename *fname, 2766 unsigned int offset, 2767 struct ext4_dir_entry_2 **res_dir); 2768 extern int ext4_generic_delete_entry(handle_t *handle, 2769 struct inode *dir, 2770 struct ext4_dir_entry_2 *de_del, 2771 struct buffer_head *bh, 2772 void *entry_buf, 2773 int buf_size, 2774 int csum_size); 2775 extern bool ext4_empty_dir(struct inode *inode); 2776 2777 /* resize.c */ 2778 extern void ext4_kvfree_array_rcu(void *to_free); 2779 extern int ext4_group_add(struct super_block *sb, 2780 struct ext4_new_group_data *input); 2781 extern int ext4_group_extend(struct super_block *sb, 2782 struct ext4_super_block *es, 2783 ext4_fsblk_t n_blocks_count); 2784 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2785 2786 /* super.c */ 2787 extern struct buffer_head *ext4_sb_bread(struct super_block *sb, 2788 sector_t block, int op_flags); 2789 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 2790 extern int ext4_calculate_overhead(struct super_block *sb); 2791 extern void ext4_superblock_csum_set(struct super_block *sb); 2792 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2793 ext4_group_t ngroup); 2794 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2795 char nbuf[16]); 2796 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb, 2797 ext4_group_t block_group, 2798 unsigned int flags); 2799 2800 extern __printf(6, 7) 2801 void __ext4_error(struct super_block *, const char *, unsigned int, int, __u64, 2802 const char *, ...); 2803 extern __printf(6, 7) 2804 void __ext4_error_inode(struct inode *, const char *, unsigned int, 2805 ext4_fsblk_t, int, const char *, ...); 2806 extern __printf(5, 6) 2807 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2808 const char *, ...); 2809 extern void __ext4_std_error(struct super_block *, const char *, 2810 unsigned int, int); 2811 extern __printf(5, 6) 2812 void __ext4_abort(struct super_block *, const char *, unsigned int, int, 2813 const char *, ...); 2814 extern __printf(4, 5) 2815 void __ext4_warning(struct super_block *, const char *, unsigned int, 2816 const char *, ...); 2817 extern __printf(4, 5) 2818 void __ext4_warning_inode(const struct inode *inode, const char *function, 2819 unsigned int line, const char *fmt, ...); 2820 extern __printf(3, 4) 2821 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2822 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2823 const char *, unsigned int, const char *); 2824 extern __printf(7, 8) 2825 void __ext4_grp_locked_error(const char *, unsigned int, 2826 struct super_block *, ext4_group_t, 2827 unsigned long, ext4_fsblk_t, 2828 const char *, ...); 2829 2830 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 2831 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 2832 2833 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \ 2834 __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a) 2835 2836 #define ext4_error_inode_block(inode, block, err, fmt, a...) \ 2837 __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \ 2838 (fmt), ## a) 2839 2840 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 2841 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 2842 2843 #ifdef CONFIG_PRINTK 2844 2845 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2846 __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__) 2847 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 2848 __ext4_error_inode((inode), (func), (line), (block), \ 2849 (err), (fmt), ##__VA_ARGS__) 2850 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2851 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2852 #define ext4_error(sb, fmt, ...) \ 2853 __ext4_error((sb), __func__, __LINE__, 0, 0, (fmt), ##__VA_ARGS__) 2854 #define ext4_error_err(sb, err, fmt, ...) \ 2855 __ext4_error((sb), __func__, __LINE__, (err), 0, (fmt), ##__VA_ARGS__) 2856 #define ext4_abort(sb, err, fmt, ...) \ 2857 __ext4_abort((sb), __func__, __LINE__, (err), (fmt), ##__VA_ARGS__) 2858 #define ext4_warning(sb, fmt, ...) \ 2859 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2860 #define ext4_warning_inode(inode, fmt, ...) \ 2861 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 2862 #define ext4_msg(sb, level, fmt, ...) \ 2863 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 2864 #define dump_mmp_msg(sb, mmp, msg) \ 2865 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 2866 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2867 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 2868 fmt, ##__VA_ARGS__) 2869 2870 #else 2871 2872 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2873 do { \ 2874 no_printk(fmt, ##__VA_ARGS__); \ 2875 __ext4_error_inode(inode, "", 0, block, 0, " "); \ 2876 } while (0) 2877 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 2878 do { \ 2879 no_printk(fmt, ##__VA_ARGS__); \ 2880 __ext4_error_inode(inode, "", 0, block, err, " "); \ 2881 } while (0) 2882 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2883 do { \ 2884 no_printk(fmt, ##__VA_ARGS__); \ 2885 __ext4_error_file(file, "", 0, block, " "); \ 2886 } while (0) 2887 #define ext4_error(sb, fmt, ...) \ 2888 do { \ 2889 no_printk(fmt, ##__VA_ARGS__); \ 2890 __ext4_error(sb, "", 0, 0, 0, " "); \ 2891 } while (0) 2892 #define ext4_error_err(sb, err, fmt, ...) \ 2893 do { \ 2894 no_printk(fmt, ##__VA_ARGS__); \ 2895 __ext4_error(sb, "", 0, err, 0, " "); \ 2896 } while (0) 2897 #define ext4_abort(sb, err, fmt, ...) \ 2898 do { \ 2899 no_printk(fmt, ##__VA_ARGS__); \ 2900 __ext4_abort(sb, "", 0, err, " "); \ 2901 } while (0) 2902 #define ext4_warning(sb, fmt, ...) \ 2903 do { \ 2904 no_printk(fmt, ##__VA_ARGS__); \ 2905 __ext4_warning(sb, "", 0, " "); \ 2906 } while (0) 2907 #define ext4_warning_inode(inode, fmt, ...) \ 2908 do { \ 2909 no_printk(fmt, ##__VA_ARGS__); \ 2910 __ext4_warning_inode(inode, "", 0, " "); \ 2911 } while (0) 2912 #define ext4_msg(sb, level, fmt, ...) \ 2913 do { \ 2914 no_printk(fmt, ##__VA_ARGS__); \ 2915 __ext4_msg(sb, "", " "); \ 2916 } while (0) 2917 #define dump_mmp_msg(sb, mmp, msg) \ 2918 __dump_mmp_msg(sb, mmp, "", 0, "") 2919 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2920 do { \ 2921 no_printk(fmt, ##__VA_ARGS__); \ 2922 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 2923 } while (0) 2924 2925 #endif 2926 2927 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2928 __u32 compat); 2929 extern int ext4_update_rocompat_feature(handle_t *handle, 2930 struct super_block *sb, __u32 rocompat); 2931 extern int ext4_update_incompat_feature(handle_t *handle, 2932 struct super_block *sb, __u32 incompat); 2933 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2934 struct ext4_group_desc *bg); 2935 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2936 struct ext4_group_desc *bg); 2937 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2938 struct ext4_group_desc *bg); 2939 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2940 struct ext4_group_desc *bg); 2941 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2942 struct ext4_group_desc *bg); 2943 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2944 struct ext4_group_desc *bg); 2945 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2946 struct ext4_group_desc *bg); 2947 extern void ext4_block_bitmap_set(struct super_block *sb, 2948 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2949 extern void ext4_inode_bitmap_set(struct super_block *sb, 2950 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2951 extern void ext4_inode_table_set(struct super_block *sb, 2952 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2953 extern void ext4_free_group_clusters_set(struct super_block *sb, 2954 struct ext4_group_desc *bg, 2955 __u32 count); 2956 extern void ext4_free_inodes_set(struct super_block *sb, 2957 struct ext4_group_desc *bg, __u32 count); 2958 extern void ext4_used_dirs_set(struct super_block *sb, 2959 struct ext4_group_desc *bg, __u32 count); 2960 extern void ext4_itable_unused_set(struct super_block *sb, 2961 struct ext4_group_desc *bg, __u32 count); 2962 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2963 struct ext4_group_desc *gdp); 2964 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2965 struct ext4_group_desc *gdp); 2966 extern int ext4_register_li_request(struct super_block *sb, 2967 ext4_group_t first_not_zeroed); 2968 2969 static inline int ext4_has_metadata_csum(struct super_block *sb) 2970 { 2971 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 2972 !EXT4_SB(sb)->s_chksum_driver); 2973 2974 return ext4_has_feature_metadata_csum(sb) && 2975 (EXT4_SB(sb)->s_chksum_driver != NULL); 2976 } 2977 2978 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2979 { 2980 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb); 2981 } 2982 2983 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2984 { 2985 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2986 le32_to_cpu(es->s_blocks_count_lo); 2987 } 2988 2989 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2990 { 2991 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2992 le32_to_cpu(es->s_r_blocks_count_lo); 2993 } 2994 2995 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2996 { 2997 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2998 le32_to_cpu(es->s_free_blocks_count_lo); 2999 } 3000 3001 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 3002 ext4_fsblk_t blk) 3003 { 3004 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 3005 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 3006 } 3007 3008 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 3009 ext4_fsblk_t blk) 3010 { 3011 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 3012 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 3013 } 3014 3015 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 3016 ext4_fsblk_t blk) 3017 { 3018 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 3019 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 3020 } 3021 3022 static inline loff_t ext4_isize(struct super_block *sb, 3023 struct ext4_inode *raw_inode) 3024 { 3025 if (ext4_has_feature_largedir(sb) || 3026 S_ISREG(le16_to_cpu(raw_inode->i_mode))) 3027 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 3028 le32_to_cpu(raw_inode->i_size_lo); 3029 3030 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 3031 } 3032 3033 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 3034 { 3035 raw_inode->i_size_lo = cpu_to_le32(i_size); 3036 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 3037 } 3038 3039 static inline 3040 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 3041 ext4_group_t group) 3042 { 3043 struct ext4_group_info **grp_info; 3044 long indexv, indexh; 3045 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 3046 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 3047 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 3048 grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv); 3049 return grp_info[indexh]; 3050 } 3051 3052 /* 3053 * Reading s_groups_count requires using smp_rmb() afterwards. See 3054 * the locking protocol documented in the comments of ext4_group_add() 3055 * in resize.c 3056 */ 3057 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 3058 { 3059 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 3060 3061 smp_rmb(); 3062 return ngroups; 3063 } 3064 3065 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 3066 ext4_group_t block_group) 3067 { 3068 return block_group >> sbi->s_log_groups_per_flex; 3069 } 3070 3071 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 3072 { 3073 return 1 << sbi->s_log_groups_per_flex; 3074 } 3075 3076 #define ext4_std_error(sb, errno) \ 3077 do { \ 3078 if ((errno)) \ 3079 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 3080 } while (0) 3081 3082 #ifdef CONFIG_SMP 3083 /* Each CPU can accumulate percpu_counter_batch clusters in their local 3084 * counters. So we need to make sure we have free clusters more 3085 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 3086 */ 3087 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 3088 #else 3089 #define EXT4_FREECLUSTERS_WATERMARK 0 3090 #endif 3091 3092 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 3093 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 3094 { 3095 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 3096 !inode_is_locked(inode)); 3097 down_write(&EXT4_I(inode)->i_data_sem); 3098 if (newsize > EXT4_I(inode)->i_disksize) 3099 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize); 3100 up_write(&EXT4_I(inode)->i_data_sem); 3101 } 3102 3103 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 3104 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 3105 { 3106 int changed = 0; 3107 3108 if (newsize > inode->i_size) { 3109 i_size_write(inode, newsize); 3110 changed = 1; 3111 } 3112 if (newsize > EXT4_I(inode)->i_disksize) { 3113 ext4_update_i_disksize(inode, newsize); 3114 changed |= 2; 3115 } 3116 return changed; 3117 } 3118 3119 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 3120 loff_t len); 3121 3122 struct ext4_group_info { 3123 unsigned long bb_state; 3124 struct rb_root bb_free_root; 3125 ext4_grpblk_t bb_first_free; /* first free block */ 3126 ext4_grpblk_t bb_free; /* total free blocks */ 3127 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 3128 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 3129 struct list_head bb_prealloc_list; 3130 #ifdef DOUBLE_CHECK 3131 void *bb_bitmap; 3132 #endif 3133 struct rw_semaphore alloc_sem; 3134 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 3135 * regions, index is order. 3136 * bb_counters[3] = 5 means 3137 * 5 free 8-block regions. */ 3138 }; 3139 3140 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 3141 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 3142 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 3143 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 3144 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \ 3145 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT) 3146 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \ 3147 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT) 3148 3149 #define EXT4_MB_GRP_NEED_INIT(grp) \ 3150 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 3151 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 3152 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3153 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 3154 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3155 3156 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 3157 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3158 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 3159 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3160 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 3161 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3162 3163 #define EXT4_MAX_CONTENTION 8 3164 #define EXT4_CONTENTION_THRESHOLD 2 3165 3166 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 3167 ext4_group_t group) 3168 { 3169 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 3170 } 3171 3172 /* 3173 * Returns true if the filesystem is busy enough that attempts to 3174 * access the block group locks has run into contention. 3175 */ 3176 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 3177 { 3178 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 3179 } 3180 3181 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 3182 { 3183 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 3184 if (spin_trylock(lock)) 3185 /* 3186 * We're able to grab the lock right away, so drop the 3187 * lock contention counter. 3188 */ 3189 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 3190 else { 3191 /* 3192 * The lock is busy, so bump the contention counter, 3193 * and then wait on the spin lock. 3194 */ 3195 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 3196 EXT4_MAX_CONTENTION); 3197 spin_lock(lock); 3198 } 3199 } 3200 3201 static inline void ext4_unlock_group(struct super_block *sb, 3202 ext4_group_t group) 3203 { 3204 spin_unlock(ext4_group_lock_ptr(sb, group)); 3205 } 3206 3207 /* 3208 * Block validity checking 3209 */ 3210 #define ext4_check_indirect_blockref(inode, bh) \ 3211 ext4_check_blockref(__func__, __LINE__, inode, \ 3212 (__le32 *)(bh)->b_data, \ 3213 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 3214 3215 #define ext4_ind_check_inode(inode) \ 3216 ext4_check_blockref(__func__, __LINE__, inode, \ 3217 EXT4_I(inode)->i_data, \ 3218 EXT4_NDIR_BLOCKS) 3219 3220 /* 3221 * Inodes and files operations 3222 */ 3223 3224 /* dir.c */ 3225 extern const struct file_operations ext4_dir_operations; 3226 3227 #ifdef CONFIG_UNICODE 3228 extern const struct dentry_operations ext4_dentry_ops; 3229 #endif 3230 3231 /* file.c */ 3232 extern const struct inode_operations ext4_file_inode_operations; 3233 extern const struct file_operations ext4_file_operations; 3234 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 3235 3236 /* inline.c */ 3237 extern int ext4_get_max_inline_size(struct inode *inode); 3238 extern int ext4_find_inline_data_nolock(struct inode *inode); 3239 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 3240 unsigned int len); 3241 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 3242 3243 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 3244 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 3245 struct inode *inode, 3246 loff_t pos, unsigned len, 3247 unsigned flags, 3248 struct page **pagep); 3249 extern int ext4_write_inline_data_end(struct inode *inode, 3250 loff_t pos, unsigned len, 3251 unsigned copied, 3252 struct page *page); 3253 extern struct buffer_head * 3254 ext4_journalled_write_inline_data(struct inode *inode, 3255 unsigned len, 3256 struct page *page); 3257 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 3258 struct inode *inode, 3259 loff_t pos, unsigned len, 3260 unsigned flags, 3261 struct page **pagep, 3262 void **fsdata); 3263 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 3264 unsigned len, unsigned copied, 3265 struct page *page); 3266 extern int ext4_try_add_inline_entry(handle_t *handle, 3267 struct ext4_filename *fname, 3268 struct inode *dir, struct inode *inode); 3269 extern int ext4_try_create_inline_dir(handle_t *handle, 3270 struct inode *parent, 3271 struct inode *inode); 3272 extern int ext4_read_inline_dir(struct file *filp, 3273 struct dir_context *ctx, 3274 int *has_inline_data); 3275 extern int ext4_inlinedir_to_tree(struct file *dir_file, 3276 struct inode *dir, ext4_lblk_t block, 3277 struct dx_hash_info *hinfo, 3278 __u32 start_hash, __u32 start_minor_hash, 3279 int *has_inline_data); 3280 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3281 struct ext4_filename *fname, 3282 struct ext4_dir_entry_2 **res_dir, 3283 int *has_inline_data); 3284 extern int ext4_delete_inline_entry(handle_t *handle, 3285 struct inode *dir, 3286 struct ext4_dir_entry_2 *de_del, 3287 struct buffer_head *bh, 3288 int *has_inline_data); 3289 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); 3290 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3291 struct ext4_dir_entry_2 **parent_de, 3292 int *retval); 3293 extern int ext4_inline_data_fiemap(struct inode *inode, 3294 struct fiemap_extent_info *fieinfo, 3295 int *has_inline, __u64 start, __u64 len); 3296 3297 struct iomap; 3298 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap); 3299 3300 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3301 3302 extern int ext4_convert_inline_data(struct inode *inode); 3303 3304 static inline int ext4_has_inline_data(struct inode *inode) 3305 { 3306 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3307 EXT4_I(inode)->i_inline_off; 3308 } 3309 3310 /* namei.c */ 3311 extern const struct inode_operations ext4_dir_inode_operations; 3312 extern const struct inode_operations ext4_special_inode_operations; 3313 extern struct dentry *ext4_get_parent(struct dentry *child); 3314 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3315 struct ext4_dir_entry_2 *de, 3316 int blocksize, int csum_size, 3317 unsigned int parent_ino, int dotdot_real_len); 3318 extern void ext4_initialize_dirent_tail(struct buffer_head *bh, 3319 unsigned int blocksize); 3320 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode, 3321 struct buffer_head *bh); 3322 extern int ext4_ci_compare(const struct inode *parent, 3323 const struct qstr *fname, 3324 const struct qstr *entry, bool quick); 3325 3326 #define S_SHIFT 12 3327 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = { 3328 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3329 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3330 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3331 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3332 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3333 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3334 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3335 }; 3336 3337 static inline void ext4_set_de_type(struct super_block *sb, 3338 struct ext4_dir_entry_2 *de, 3339 umode_t mode) { 3340 if (ext4_has_feature_filetype(sb)) 3341 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3342 } 3343 3344 /* readpages.c */ 3345 extern int ext4_mpage_readpages(struct inode *inode, 3346 struct readahead_control *rac, struct page *page); 3347 extern int __init ext4_init_post_read_processing(void); 3348 extern void ext4_exit_post_read_processing(void); 3349 3350 /* symlink.c */ 3351 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3352 extern const struct inode_operations ext4_symlink_inode_operations; 3353 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3354 3355 /* sysfs.c */ 3356 extern int ext4_register_sysfs(struct super_block *sb); 3357 extern void ext4_unregister_sysfs(struct super_block *sb); 3358 extern int __init ext4_init_sysfs(void); 3359 extern void ext4_exit_sysfs(void); 3360 3361 /* block_validity */ 3362 extern void ext4_release_system_zone(struct super_block *sb); 3363 extern int ext4_setup_system_zone(struct super_block *sb); 3364 extern int __init ext4_init_system_zone(void); 3365 extern void ext4_exit_system_zone(void); 3366 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 3367 ext4_fsblk_t start_blk, 3368 unsigned int count); 3369 extern int ext4_check_blockref(const char *, unsigned int, 3370 struct inode *, __le32 *, unsigned int); 3371 3372 /* extents.c */ 3373 struct ext4_ext_path; 3374 struct ext4_extent; 3375 3376 /* 3377 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3378 * __le32. 3379 */ 3380 #define EXT_MAX_BLOCKS 0xffffffff 3381 3382 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode); 3383 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3384 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3385 struct ext4_map_blocks *map, int flags); 3386 extern int ext4_ext_truncate(handle_t *, struct inode *); 3387 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3388 ext4_lblk_t end); 3389 extern void ext4_ext_init(struct super_block *); 3390 extern void ext4_ext_release(struct super_block *); 3391 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3392 loff_t len); 3393 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3394 loff_t offset, ssize_t len); 3395 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle, 3396 ext4_io_end_t *io_end); 3397 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3398 struct ext4_map_blocks *map, int flags); 3399 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3400 int num, 3401 struct ext4_ext_path *path); 3402 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3403 struct ext4_ext_path **, 3404 struct ext4_extent *, int); 3405 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3406 struct ext4_ext_path **, 3407 int flags); 3408 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 3409 extern int ext4_ext_check_inode(struct inode *inode); 3410 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3411 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3412 __u64 start, __u64 len); 3413 extern int ext4_get_es_cache(struct inode *inode, 3414 struct fiemap_extent_info *fieinfo, 3415 __u64 start, __u64 len); 3416 extern int ext4_ext_precache(struct inode *inode); 3417 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3418 struct inode *inode2, ext4_lblk_t lblk1, 3419 ext4_lblk_t lblk2, ext4_lblk_t count, 3420 int mark_unwritten,int *err); 3421 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu); 3422 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode, 3423 int check_cred, int restart_cred, 3424 int revoke_cred); 3425 3426 3427 /* move_extent.c */ 3428 extern void ext4_double_down_write_data_sem(struct inode *first, 3429 struct inode *second); 3430 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3431 struct inode *donor_inode); 3432 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3433 __u64 start_orig, __u64 start_donor, 3434 __u64 len, __u64 *moved_len); 3435 3436 /* page-io.c */ 3437 extern int __init ext4_init_pageio(void); 3438 extern void ext4_exit_pageio(void); 3439 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3440 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3441 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3442 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3443 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3444 struct writeback_control *wbc); 3445 extern void ext4_end_io_rsv_work(struct work_struct *work); 3446 extern void ext4_io_submit(struct ext4_io_submit *io); 3447 extern int ext4_bio_write_page(struct ext4_io_submit *io, 3448 struct page *page, 3449 int len, 3450 struct writeback_control *wbc, 3451 bool keep_towrite); 3452 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end); 3453 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end); 3454 3455 /* mmp.c */ 3456 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3457 3458 /* verity.c */ 3459 extern const struct fsverity_operations ext4_verityops; 3460 3461 /* 3462 * Add new method to test whether block and inode bitmaps are properly 3463 * initialized. With uninit_bg reading the block from disk is not enough 3464 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3465 */ 3466 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3467 3468 static inline int bitmap_uptodate(struct buffer_head *bh) 3469 { 3470 return (buffer_uptodate(bh) && 3471 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3472 } 3473 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3474 { 3475 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3476 } 3477 3478 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3479 3480 /* For ioend & aio unwritten conversion wait queues */ 3481 #define EXT4_WQ_HASH_SZ 37 3482 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3483 EXT4_WQ_HASH_SZ]) 3484 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3485 3486 extern int ext4_resize_begin(struct super_block *sb); 3487 extern void ext4_resize_end(struct super_block *sb); 3488 3489 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 3490 struct ext4_io_end *io_end) 3491 { 3492 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 3493 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3494 atomic_inc(&EXT4_I(inode)->i_unwritten); 3495 } 3496 } 3497 3498 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3499 { 3500 struct inode *inode = io_end->inode; 3501 3502 if (io_end->flag & EXT4_IO_END_UNWRITTEN) { 3503 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3504 /* Wake up anyone waiting on unwritten extent conversion */ 3505 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) 3506 wake_up_all(ext4_ioend_wq(inode)); 3507 } 3508 } 3509 3510 extern const struct iomap_ops ext4_iomap_ops; 3511 extern const struct iomap_ops ext4_iomap_overwrite_ops; 3512 extern const struct iomap_ops ext4_iomap_report_ops; 3513 3514 static inline int ext4_buffer_uptodate(struct buffer_head *bh) 3515 { 3516 /* 3517 * If the buffer has the write error flag, we have failed 3518 * to write out data in the block. In this case, we don't 3519 * have to read the block because we may read the old data 3520 * successfully. 3521 */ 3522 if (!buffer_uptodate(bh) && buffer_write_io_error(bh)) 3523 set_buffer_uptodate(bh); 3524 return buffer_uptodate(bh); 3525 } 3526 3527 #endif /* __KERNEL__ */ 3528 3529 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3530 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3531 3532 #endif /* _EXT4_H */ 3533