1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * ext4.h 4 * 5 * Copyright (C) 1992, 1993, 1994, 1995 6 * Remy Card (card@masi.ibp.fr) 7 * Laboratoire MASI - Institut Blaise Pascal 8 * Universite Pierre et Marie Curie (Paris VI) 9 * 10 * from 11 * 12 * linux/include/linux/minix_fs.h 13 * 14 * Copyright (C) 1991, 1992 Linus Torvalds 15 */ 16 17 #ifndef _EXT4_H 18 #define _EXT4_H 19 20 #include <linux/types.h> 21 #include <linux/blkdev.h> 22 #include <linux/magic.h> 23 #include <linux/jbd2.h> 24 #include <linux/quota.h> 25 #include <linux/rwsem.h> 26 #include <linux/rbtree.h> 27 #include <linux/seqlock.h> 28 #include <linux/mutex.h> 29 #include <linux/timer.h> 30 #include <linux/wait.h> 31 #include <linux/sched/signal.h> 32 #include <linux/blockgroup_lock.h> 33 #include <linux/percpu_counter.h> 34 #include <linux/ratelimit.h> 35 #include <crypto/hash.h> 36 #include <linux/falloc.h> 37 #include <linux/percpu-rwsem.h> 38 #include <linux/fiemap.h> 39 #ifdef __KERNEL__ 40 #include <linux/compat.h> 41 #endif 42 43 #include <linux/fscrypt.h> 44 #include <linux/fsverity.h> 45 46 #include <linux/compiler.h> 47 48 /* 49 * The fourth extended filesystem constants/structures 50 */ 51 52 /* 53 * with AGGRESSIVE_CHECK allocator runs consistency checks over 54 * structures. these checks slow things down a lot 55 */ 56 #define AGGRESSIVE_CHECK__ 57 58 /* 59 * with DOUBLE_CHECK defined mballoc creates persistent in-core 60 * bitmaps, maintains and uses them to check for double allocations 61 */ 62 #define DOUBLE_CHECK__ 63 64 /* 65 * Define EXT4FS_DEBUG to produce debug messages 66 */ 67 #undef EXT4FS_DEBUG 68 69 /* 70 * Debug code 71 */ 72 #ifdef EXT4FS_DEBUG 73 #define ext4_debug(f, a...) \ 74 do { \ 75 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 76 __FILE__, __LINE__, __func__); \ 77 printk(KERN_DEBUG f, ## a); \ 78 } while (0) 79 #else 80 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 81 #endif 82 83 /* 84 * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c 85 */ 86 #define EXT_DEBUG__ 87 88 /* 89 * Dynamic printk for controlled extents debugging. 90 */ 91 #ifdef CONFIG_EXT4_DEBUG 92 #define ext_debug(ino, fmt, ...) \ 93 pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt, \ 94 current->comm, task_pid_nr(current), \ 95 ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__, \ 96 __func__, ##__VA_ARGS__) 97 #else 98 #define ext_debug(ino, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 99 #endif 100 101 /* data type for block offset of block group */ 102 typedef int ext4_grpblk_t; 103 104 /* data type for filesystem-wide blocks number */ 105 typedef unsigned long long ext4_fsblk_t; 106 107 /* data type for file logical block number */ 108 typedef __u32 ext4_lblk_t; 109 110 /* data type for block group number */ 111 typedef unsigned int ext4_group_t; 112 113 enum SHIFT_DIRECTION { 114 SHIFT_LEFT = 0, 115 SHIFT_RIGHT, 116 }; 117 118 /* 119 * Flags used in mballoc's allocation_context flags field. 120 * 121 * Also used to show what's going on for debugging purposes when the 122 * flag field is exported via the traceport interface 123 */ 124 125 /* prefer goal again. length */ 126 #define EXT4_MB_HINT_MERGE 0x0001 127 /* blocks already reserved */ 128 #define EXT4_MB_HINT_RESERVED 0x0002 129 /* metadata is being allocated */ 130 #define EXT4_MB_HINT_METADATA 0x0004 131 /* first blocks in the file */ 132 #define EXT4_MB_HINT_FIRST 0x0008 133 /* search for the best chunk */ 134 #define EXT4_MB_HINT_BEST 0x0010 135 /* data is being allocated */ 136 #define EXT4_MB_HINT_DATA 0x0020 137 /* don't preallocate (for tails) */ 138 #define EXT4_MB_HINT_NOPREALLOC 0x0040 139 /* allocate for locality group */ 140 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 141 /* allocate goal blocks or none */ 142 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 143 /* goal is meaningful */ 144 #define EXT4_MB_HINT_TRY_GOAL 0x0200 145 /* blocks already pre-reserved by delayed allocation */ 146 #define EXT4_MB_DELALLOC_RESERVED 0x0400 147 /* We are doing stream allocation */ 148 #define EXT4_MB_STREAM_ALLOC 0x0800 149 /* Use reserved root blocks if needed */ 150 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 151 /* Use blocks from reserved pool */ 152 #define EXT4_MB_USE_RESERVED 0x2000 153 /* Do strict check for free blocks while retrying block allocation */ 154 #define EXT4_MB_STRICT_CHECK 0x4000 155 156 struct ext4_allocation_request { 157 /* target inode for block we're allocating */ 158 struct inode *inode; 159 /* how many blocks we want to allocate */ 160 unsigned int len; 161 /* logical block in target inode */ 162 ext4_lblk_t logical; 163 /* the closest logical allocated block to the left */ 164 ext4_lblk_t lleft; 165 /* the closest logical allocated block to the right */ 166 ext4_lblk_t lright; 167 /* phys. target (a hint) */ 168 ext4_fsblk_t goal; 169 /* phys. block for the closest logical allocated block to the left */ 170 ext4_fsblk_t pleft; 171 /* phys. block for the closest logical allocated block to the right */ 172 ext4_fsblk_t pright; 173 /* flags. see above EXT4_MB_HINT_* */ 174 unsigned int flags; 175 }; 176 177 /* 178 * Logical to physical block mapping, used by ext4_map_blocks() 179 * 180 * This structure is used to pass requests into ext4_map_blocks() as 181 * well as to store the information returned by ext4_map_blocks(). It 182 * takes less room on the stack than a struct buffer_head. 183 */ 184 #define EXT4_MAP_NEW BIT(BH_New) 185 #define EXT4_MAP_MAPPED BIT(BH_Mapped) 186 #define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten) 187 #define EXT4_MAP_BOUNDARY BIT(BH_Boundary) 188 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 189 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 190 191 struct ext4_map_blocks { 192 ext4_fsblk_t m_pblk; 193 ext4_lblk_t m_lblk; 194 unsigned int m_len; 195 unsigned int m_flags; 196 }; 197 198 /* 199 * Block validity checking, system zone rbtree. 200 */ 201 struct ext4_system_blocks { 202 struct rb_root root; 203 struct rcu_head rcu; 204 }; 205 206 /* 207 * Flags for ext4_io_end->flags 208 */ 209 #define EXT4_IO_END_UNWRITTEN 0x0001 210 211 struct ext4_io_end_vec { 212 struct list_head list; /* list of io_end_vec */ 213 loff_t offset; /* offset in the file */ 214 ssize_t size; /* size of the extent */ 215 }; 216 217 /* 218 * For converting unwritten extents on a work queue. 'handle' is used for 219 * buffered writeback. 220 */ 221 typedef struct ext4_io_end { 222 struct list_head list; /* per-file finished IO list */ 223 handle_t *handle; /* handle reserved for extent 224 * conversion */ 225 struct inode *inode; /* file being written to */ 226 struct bio *bio; /* Linked list of completed 227 * bios covering the extent */ 228 unsigned int flag; /* unwritten or not */ 229 atomic_t count; /* reference counter */ 230 struct list_head list_vec; /* list of ext4_io_end_vec */ 231 } ext4_io_end_t; 232 233 struct ext4_io_submit { 234 struct writeback_control *io_wbc; 235 struct bio *io_bio; 236 ext4_io_end_t *io_end; 237 sector_t io_next_block; 238 }; 239 240 /* 241 * Special inodes numbers 242 */ 243 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 244 #define EXT4_ROOT_INO 2 /* Root inode */ 245 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 246 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 247 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 248 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 249 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 250 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 251 252 /* First non-reserved inode for old ext4 filesystems */ 253 #define EXT4_GOOD_OLD_FIRST_INO 11 254 255 /* 256 * Maximal count of links to a file 257 */ 258 #define EXT4_LINK_MAX 65000 259 260 /* 261 * Macro-instructions used to manage several block sizes 262 */ 263 #define EXT4_MIN_BLOCK_SIZE 1024 264 #define EXT4_MAX_BLOCK_SIZE 65536 265 #define EXT4_MIN_BLOCK_LOG_SIZE 10 266 #define EXT4_MAX_BLOCK_LOG_SIZE 16 267 #define EXT4_MAX_CLUSTER_LOG_SIZE 30 268 #ifdef __KERNEL__ 269 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 270 #else 271 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 272 #endif 273 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 274 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 275 EXT4_SB(s)->s_cluster_bits) 276 #ifdef __KERNEL__ 277 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 278 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 279 #else 280 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 281 #endif 282 #ifdef __KERNEL__ 283 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 284 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 285 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 286 #else 287 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 288 EXT4_GOOD_OLD_INODE_SIZE : \ 289 (s)->s_inode_size) 290 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 291 EXT4_GOOD_OLD_FIRST_INO : \ 292 (s)->s_first_ino) 293 #endif 294 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 295 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \ 296 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \ 297 blkbits)) 298 299 /* Translate a block number to a cluster number */ 300 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 301 /* Translate a cluster number to a block number */ 302 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 303 /* Translate # of blks to # of clusters */ 304 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 305 (sbi)->s_cluster_bits) 306 /* Mask out the low bits to get the starting block of the cluster */ 307 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 308 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 309 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 310 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 311 /* Fill in the low bits to get the last block of the cluster */ 312 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \ 313 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1)) 314 /* Get the cluster offset */ 315 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 316 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 317 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 318 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 319 320 /* 321 * Structure of a blocks group descriptor 322 */ 323 struct ext4_group_desc 324 { 325 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 326 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 327 __le32 bg_inode_table_lo; /* Inodes table block */ 328 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 329 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 330 __le16 bg_used_dirs_count_lo; /* Directories count */ 331 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 332 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 333 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 334 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 335 __le16 bg_itable_unused_lo; /* Unused inodes count */ 336 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 337 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 338 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 339 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 340 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 341 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 342 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 343 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 344 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 345 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 346 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 347 __u32 bg_reserved; 348 }; 349 350 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 351 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 352 sizeof(__le16)) 353 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 354 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 355 sizeof(__le16)) 356 357 /* 358 * Structure of a flex block group info 359 */ 360 361 struct flex_groups { 362 atomic64_t free_clusters; 363 atomic_t free_inodes; 364 atomic_t used_dirs; 365 }; 366 367 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 368 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 369 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 370 371 /* 372 * Macro-instructions used to manage group descriptors 373 */ 374 #define EXT4_MIN_DESC_SIZE 32 375 #define EXT4_MIN_DESC_SIZE_64BIT 64 376 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 377 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 378 #ifdef __KERNEL__ 379 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 380 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 381 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 382 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 383 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 384 #else 385 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 386 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 387 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 388 #endif 389 390 /* 391 * Constants relative to the data blocks 392 */ 393 #define EXT4_NDIR_BLOCKS 12 394 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 395 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 396 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 397 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 398 399 /* 400 * Inode flags 401 */ 402 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 403 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 404 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 405 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 406 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 407 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 408 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 409 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 410 /* Reserved for compression usage... */ 411 #define EXT4_DIRTY_FL 0x00000100 412 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 413 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 414 /* nb: was previously EXT2_ECOMPR_FL */ 415 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 416 /* End compression flags --- maybe not all used */ 417 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 418 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 419 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 420 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 421 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 422 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 423 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 424 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 425 #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */ 426 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 427 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */ 428 429 #define EXT4_DAX_FL 0x02000000 /* Inode is DAX */ 430 431 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 432 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 433 #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */ 434 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 435 436 /* User modifiable flags */ 437 #define EXT4_FL_USER_MODIFIABLE (EXT4_SECRM_FL | \ 438 EXT4_UNRM_FL | \ 439 EXT4_COMPR_FL | \ 440 EXT4_SYNC_FL | \ 441 EXT4_IMMUTABLE_FL | \ 442 EXT4_APPEND_FL | \ 443 EXT4_NODUMP_FL | \ 444 EXT4_NOATIME_FL | \ 445 EXT4_JOURNAL_DATA_FL | \ 446 EXT4_NOTAIL_FL | \ 447 EXT4_DIRSYNC_FL | \ 448 EXT4_TOPDIR_FL | \ 449 EXT4_EXTENTS_FL | \ 450 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \ 451 EXT4_DAX_FL | \ 452 EXT4_PROJINHERIT_FL | \ 453 EXT4_CASEFOLD_FL) 454 455 /* User visible flags */ 456 #define EXT4_FL_USER_VISIBLE (EXT4_FL_USER_MODIFIABLE | \ 457 EXT4_DIRTY_FL | \ 458 EXT4_COMPRBLK_FL | \ 459 EXT4_NOCOMPR_FL | \ 460 EXT4_ENCRYPT_FL | \ 461 EXT4_INDEX_FL | \ 462 EXT4_VERITY_FL | \ 463 EXT4_INLINE_DATA_FL) 464 465 /* Flags we can manipulate with through FS_IOC_FSSETXATTR */ 466 #define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \ 467 EXT4_IMMUTABLE_FL | \ 468 EXT4_APPEND_FL | \ 469 EXT4_NODUMP_FL | \ 470 EXT4_NOATIME_FL | \ 471 EXT4_PROJINHERIT_FL | \ 472 EXT4_DAX_FL) 473 474 /* Flags that should be inherited by new inodes from their parent. */ 475 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 476 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 477 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 478 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 479 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\ 480 EXT4_DAX_FL) 481 482 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 483 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\ 484 EXT4_PROJINHERIT_FL)) 485 486 /* Flags that are appropriate for non-directories/regular files. */ 487 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 488 489 /* The only flags that should be swapped */ 490 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL) 491 492 /* Flags which are mutually exclusive to DAX */ 493 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\ 494 EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL) 495 496 /* Mask out flags that are inappropriate for the given type of inode. */ 497 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 498 { 499 if (S_ISDIR(mode)) 500 return flags; 501 else if (S_ISREG(mode)) 502 return flags & EXT4_REG_FLMASK; 503 else 504 return flags & EXT4_OTHER_FLMASK; 505 } 506 507 /* 508 * Inode flags used for atomic set/get 509 */ 510 enum { 511 EXT4_INODE_SECRM = 0, /* Secure deletion */ 512 EXT4_INODE_UNRM = 1, /* Undelete */ 513 EXT4_INODE_COMPR = 2, /* Compress file */ 514 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 515 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 516 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 517 EXT4_INODE_NODUMP = 6, /* do not dump file */ 518 EXT4_INODE_NOATIME = 7, /* do not update atime */ 519 /* Reserved for compression usage... */ 520 EXT4_INODE_DIRTY = 8, 521 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 522 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 523 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 524 /* End compression flags --- maybe not all used */ 525 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 526 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 527 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 528 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 529 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 530 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 531 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 532 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 533 EXT4_INODE_VERITY = 20, /* Verity protected inode */ 534 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 535 /* 22 was formerly EXT4_INODE_EOFBLOCKS */ 536 EXT4_INODE_DAX = 25, /* Inode is DAX */ 537 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 538 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 539 EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */ 540 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 541 }; 542 543 /* 544 * Since it's pretty easy to mix up bit numbers and hex values, we use a 545 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 546 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 547 * any extra space in the compiled kernel image, otherwise, the build will fail. 548 * It's important that these values are the same, since we are using 549 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 550 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 551 * values found in ext2, ext3 and ext4 filesystems, and of course the values 552 * defined in e2fsprogs. 553 * 554 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 555 */ 556 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 557 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 558 559 static inline void ext4_check_flag_values(void) 560 { 561 CHECK_FLAG_VALUE(SECRM); 562 CHECK_FLAG_VALUE(UNRM); 563 CHECK_FLAG_VALUE(COMPR); 564 CHECK_FLAG_VALUE(SYNC); 565 CHECK_FLAG_VALUE(IMMUTABLE); 566 CHECK_FLAG_VALUE(APPEND); 567 CHECK_FLAG_VALUE(NODUMP); 568 CHECK_FLAG_VALUE(NOATIME); 569 CHECK_FLAG_VALUE(DIRTY); 570 CHECK_FLAG_VALUE(COMPRBLK); 571 CHECK_FLAG_VALUE(NOCOMPR); 572 CHECK_FLAG_VALUE(ENCRYPT); 573 CHECK_FLAG_VALUE(INDEX); 574 CHECK_FLAG_VALUE(IMAGIC); 575 CHECK_FLAG_VALUE(JOURNAL_DATA); 576 CHECK_FLAG_VALUE(NOTAIL); 577 CHECK_FLAG_VALUE(DIRSYNC); 578 CHECK_FLAG_VALUE(TOPDIR); 579 CHECK_FLAG_VALUE(HUGE_FILE); 580 CHECK_FLAG_VALUE(EXTENTS); 581 CHECK_FLAG_VALUE(VERITY); 582 CHECK_FLAG_VALUE(EA_INODE); 583 CHECK_FLAG_VALUE(INLINE_DATA); 584 CHECK_FLAG_VALUE(PROJINHERIT); 585 CHECK_FLAG_VALUE(CASEFOLD); 586 CHECK_FLAG_VALUE(RESERVED); 587 } 588 589 /* Used to pass group descriptor data when online resize is done */ 590 struct ext4_new_group_input { 591 __u32 group; /* Group number for this data */ 592 __u64 block_bitmap; /* Absolute block number of block bitmap */ 593 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 594 __u64 inode_table; /* Absolute block number of inode table start */ 595 __u32 blocks_count; /* Total number of blocks in this group */ 596 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 597 __u16 unused; 598 }; 599 600 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 601 struct compat_ext4_new_group_input { 602 u32 group; 603 compat_u64 block_bitmap; 604 compat_u64 inode_bitmap; 605 compat_u64 inode_table; 606 u32 blocks_count; 607 u16 reserved_blocks; 608 u16 unused; 609 }; 610 #endif 611 612 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 613 struct ext4_new_group_data { 614 __u32 group; 615 __u64 block_bitmap; 616 __u64 inode_bitmap; 617 __u64 inode_table; 618 __u32 blocks_count; 619 __u16 reserved_blocks; 620 __u16 mdata_blocks; 621 __u32 free_clusters_count; 622 }; 623 624 /* Indexes used to index group tables in ext4_new_group_data */ 625 enum { 626 BLOCK_BITMAP = 0, /* block bitmap */ 627 INODE_BITMAP, /* inode bitmap */ 628 INODE_TABLE, /* inode tables */ 629 GROUP_TABLE_COUNT, 630 }; 631 632 /* 633 * Flags used by ext4_map_blocks() 634 */ 635 /* Allocate any needed blocks and/or convert an unwritten 636 extent to be an initialized ext4 */ 637 #define EXT4_GET_BLOCKS_CREATE 0x0001 638 /* Request the creation of an unwritten extent */ 639 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 640 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 641 EXT4_GET_BLOCKS_CREATE) 642 /* Caller is from the delayed allocation writeout path 643 * finally doing the actual allocation of delayed blocks */ 644 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 645 /* caller is from the direct IO path, request to creation of an 646 unwritten extents if not allocated, split the unwritten 647 extent if blocks has been preallocated already*/ 648 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 649 #define EXT4_GET_BLOCKS_CONVERT 0x0010 650 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 651 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 652 /* Convert extent to initialized after IO complete */ 653 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 654 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 655 /* Eventual metadata allocation (due to growing extent tree) 656 * should not fail, so try to use reserved blocks for that.*/ 657 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 658 /* Don't normalize allocation size (used for fallocate) */ 659 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 660 /* Convert written extents to unwritten */ 661 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 662 /* Write zeros to newly created written extents */ 663 #define EXT4_GET_BLOCKS_ZERO 0x0200 664 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 665 EXT4_GET_BLOCKS_ZERO) 666 /* Caller will submit data before dropping transaction handle. This 667 * allows jbd2 to avoid submitting data before commit. */ 668 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 669 670 /* 671 * The bit position of these flags must not overlap with any of the 672 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 673 * read_extent_tree_block(), ext4_split_extent_at(), 674 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 675 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 676 * caching the extents when reading from the extent tree while a 677 * truncate or punch hole operation is in progress. 678 */ 679 #define EXT4_EX_NOCACHE 0x40000000 680 #define EXT4_EX_FORCE_CACHE 0x20000000 681 #define EXT4_EX_NOFAIL 0x10000000 682 683 /* 684 * Flags used by ext4_free_blocks 685 */ 686 #define EXT4_FREE_BLOCKS_METADATA 0x0001 687 #define EXT4_FREE_BLOCKS_FORGET 0x0002 688 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 689 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 690 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 691 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 692 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040 693 694 /* 695 * ioctl commands 696 */ 697 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 698 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 699 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 700 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 701 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 702 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 703 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 704 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 705 #define EXT4_IOC_MIGRATE _IO('f', 9) 706 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 707 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 708 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 709 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 710 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 711 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 712 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 713 /* ioctl codes 19--39 are reserved for fscrypt */ 714 #define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40) 715 #define EXT4_IOC_GETSTATE _IOW('f', 41, __u32) 716 #define EXT4_IOC_GET_ES_CACHE _IOWR('f', 42, struct fiemap) 717 718 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32) 719 720 /* 721 * Flags for going down operation 722 */ 723 #define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */ 724 #define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */ 725 #define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */ 726 727 /* 728 * Flags returned by EXT4_IOC_GETSTATE 729 * 730 * We only expose to userspace a subset of the state flags in 731 * i_state_flags 732 */ 733 #define EXT4_STATE_FLAG_EXT_PRECACHED 0x00000001 734 #define EXT4_STATE_FLAG_NEW 0x00000002 735 #define EXT4_STATE_FLAG_NEWENTRY 0x00000004 736 #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE 0x00000008 737 738 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 739 /* 740 * ioctl commands in 32 bit emulation 741 */ 742 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 743 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 744 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 745 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 746 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 747 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 748 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 749 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 750 #endif 751 752 /* 753 * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag. 754 * It indicates that the entry in extent status cache is for a hole. 755 */ 756 #define EXT4_FIEMAP_EXTENT_HOLE 0x08000000 757 758 /* Max physical block we can address w/o extents */ 759 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 760 761 /* Max logical block we can support */ 762 #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE 763 764 /* 765 * Structure of an inode on the disk 766 */ 767 struct ext4_inode { 768 __le16 i_mode; /* File mode */ 769 __le16 i_uid; /* Low 16 bits of Owner Uid */ 770 __le32 i_size_lo; /* Size in bytes */ 771 __le32 i_atime; /* Access time */ 772 __le32 i_ctime; /* Inode Change time */ 773 __le32 i_mtime; /* Modification time */ 774 __le32 i_dtime; /* Deletion Time */ 775 __le16 i_gid; /* Low 16 bits of Group Id */ 776 __le16 i_links_count; /* Links count */ 777 __le32 i_blocks_lo; /* Blocks count */ 778 __le32 i_flags; /* File flags */ 779 union { 780 struct { 781 __le32 l_i_version; 782 } linux1; 783 struct { 784 __u32 h_i_translator; 785 } hurd1; 786 struct { 787 __u32 m_i_reserved1; 788 } masix1; 789 } osd1; /* OS dependent 1 */ 790 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 791 __le32 i_generation; /* File version (for NFS) */ 792 __le32 i_file_acl_lo; /* File ACL */ 793 __le32 i_size_high; 794 __le32 i_obso_faddr; /* Obsoleted fragment address */ 795 union { 796 struct { 797 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 798 __le16 l_i_file_acl_high; 799 __le16 l_i_uid_high; /* these 2 fields */ 800 __le16 l_i_gid_high; /* were reserved2[0] */ 801 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 802 __le16 l_i_reserved; 803 } linux2; 804 struct { 805 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 806 __u16 h_i_mode_high; 807 __u16 h_i_uid_high; 808 __u16 h_i_gid_high; 809 __u32 h_i_author; 810 } hurd2; 811 struct { 812 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 813 __le16 m_i_file_acl_high; 814 __u32 m_i_reserved2[2]; 815 } masix2; 816 } osd2; /* OS dependent 2 */ 817 __le16 i_extra_isize; 818 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 819 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 820 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 821 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 822 __le32 i_crtime; /* File Creation time */ 823 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 824 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 825 __le32 i_projid; /* Project ID */ 826 }; 827 828 struct move_extent { 829 __u32 reserved; /* should be zero */ 830 __u32 donor_fd; /* donor file descriptor */ 831 __u64 orig_start; /* logical start offset in block for orig */ 832 __u64 donor_start; /* logical start offset in block for donor */ 833 __u64 len; /* block length to be moved */ 834 __u64 moved_len; /* moved block length */ 835 }; 836 837 #define EXT4_EPOCH_BITS 2 838 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 839 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 840 841 /* 842 * Extended fields will fit into an inode if the filesystem was formatted 843 * with large inodes (-I 256 or larger) and there are not currently any EAs 844 * consuming all of the available space. For new inodes we always reserve 845 * enough space for the kernel's known extended fields, but for inodes 846 * created with an old kernel this might not have been the case. None of 847 * the extended inode fields is critical for correct filesystem operation. 848 * This macro checks if a certain field fits in the inode. Note that 849 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 850 */ 851 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 852 ((offsetof(typeof(*ext4_inode), field) + \ 853 sizeof((ext4_inode)->field)) \ 854 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 855 (einode)->i_extra_isize)) \ 856 857 /* 858 * We use an encoding that preserves the times for extra epoch "00": 859 * 860 * extra msb of adjust for signed 861 * epoch 32-bit 32-bit tv_sec to 862 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 863 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 864 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 865 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 866 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 867 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 868 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 869 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 870 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 871 * 872 * Note that previous versions of the kernel on 64-bit systems would 873 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 874 * 1970. e2fsck will correct this, assuming that it is run on the 875 * affected filesystem before 2242. 876 */ 877 878 static inline __le32 ext4_encode_extra_time(struct timespec64 *time) 879 { 880 u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK; 881 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); 882 } 883 884 static inline void ext4_decode_extra_time(struct timespec64 *time, 885 __le32 extra) 886 { 887 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) 888 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 889 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 890 } 891 892 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 893 do { \ 894 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\ 895 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 896 (raw_inode)->xtime ## _extra = \ 897 ext4_encode_extra_time(&(inode)->xtime); \ 898 } \ 899 else \ 900 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX)); \ 901 } while (0) 902 903 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 904 do { \ 905 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 906 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 907 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 908 (raw_inode)->xtime ## _extra = \ 909 ext4_encode_extra_time(&(einode)->xtime); \ 910 } while (0) 911 912 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 913 do { \ 914 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 915 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \ 916 ext4_decode_extra_time(&(inode)->xtime, \ 917 raw_inode->xtime ## _extra); \ 918 } \ 919 else \ 920 (inode)->xtime.tv_nsec = 0; \ 921 } while (0) 922 923 924 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 925 do { \ 926 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 927 (einode)->xtime.tv_sec = \ 928 (signed)le32_to_cpu((raw_inode)->xtime); \ 929 else \ 930 (einode)->xtime.tv_sec = 0; \ 931 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 932 ext4_decode_extra_time(&(einode)->xtime, \ 933 raw_inode->xtime ## _extra); \ 934 else \ 935 (einode)->xtime.tv_nsec = 0; \ 936 } while (0) 937 938 #define i_disk_version osd1.linux1.l_i_version 939 940 #if defined(__KERNEL__) || defined(__linux__) 941 #define i_reserved1 osd1.linux1.l_i_reserved1 942 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 943 #define i_blocks_high osd2.linux2.l_i_blocks_high 944 #define i_uid_low i_uid 945 #define i_gid_low i_gid 946 #define i_uid_high osd2.linux2.l_i_uid_high 947 #define i_gid_high osd2.linux2.l_i_gid_high 948 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 949 950 #elif defined(__GNU__) 951 952 #define i_translator osd1.hurd1.h_i_translator 953 #define i_uid_high osd2.hurd2.h_i_uid_high 954 #define i_gid_high osd2.hurd2.h_i_gid_high 955 #define i_author osd2.hurd2.h_i_author 956 957 #elif defined(__masix__) 958 959 #define i_reserved1 osd1.masix1.m_i_reserved1 960 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 961 #define i_reserved2 osd2.masix2.m_i_reserved2 962 963 #endif /* defined(__KERNEL__) || defined(__linux__) */ 964 965 #include "extents_status.h" 966 967 /* 968 * Lock subclasses for i_data_sem in the ext4_inode_info structure. 969 * 970 * These are needed to avoid lockdep false positives when we need to 971 * allocate blocks to the quota inode during ext4_map_blocks(), while 972 * holding i_data_sem for a normal (non-quota) inode. Since we don't 973 * do quota tracking for the quota inode, this avoids deadlock (as 974 * well as infinite recursion, since it isn't turtles all the way 975 * down...) 976 * 977 * I_DATA_SEM_NORMAL - Used for most inodes 978 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode 979 * where the second inode has larger inode number 980 * than the first 981 * I_DATA_SEM_QUOTA - Used for quota inodes only 982 */ 983 enum { 984 I_DATA_SEM_NORMAL = 0, 985 I_DATA_SEM_OTHER, 986 I_DATA_SEM_QUOTA, 987 }; 988 989 990 /* 991 * fourth extended file system inode data in memory 992 */ 993 struct ext4_inode_info { 994 __le32 i_data[15]; /* unconverted */ 995 __u32 i_dtime; 996 ext4_fsblk_t i_file_acl; 997 998 /* 999 * i_block_group is the number of the block group which contains 1000 * this file's inode. Constant across the lifetime of the inode, 1001 * it is used for making block allocation decisions - we try to 1002 * place a file's data blocks near its inode block, and new inodes 1003 * near to their parent directory's inode. 1004 */ 1005 ext4_group_t i_block_group; 1006 ext4_lblk_t i_dir_start_lookup; 1007 #if (BITS_PER_LONG < 64) 1008 unsigned long i_state_flags; /* Dynamic state flags */ 1009 #endif 1010 unsigned long i_flags; 1011 1012 /* 1013 * Extended attributes can be read independently of the main file 1014 * data. Taking i_mutex even when reading would cause contention 1015 * between readers of EAs and writers of regular file data, so 1016 * instead we synchronize on xattr_sem when reading or changing 1017 * EAs. 1018 */ 1019 struct rw_semaphore xattr_sem; 1020 1021 struct list_head i_orphan; /* unlinked but open inodes */ 1022 1023 /* 1024 * i_disksize keeps track of what the inode size is ON DISK, not 1025 * in memory. During truncate, i_size is set to the new size by 1026 * the VFS prior to calling ext4_truncate(), but the filesystem won't 1027 * set i_disksize to 0 until the truncate is actually under way. 1028 * 1029 * The intent is that i_disksize always represents the blocks which 1030 * are used by this file. This allows recovery to restart truncate 1031 * on orphans if we crash during truncate. We actually write i_disksize 1032 * into the on-disk inode when writing inodes out, instead of i_size. 1033 * 1034 * The only time when i_disksize and i_size may be different is when 1035 * a truncate is in progress. The only things which change i_disksize 1036 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 1037 */ 1038 loff_t i_disksize; 1039 1040 /* 1041 * i_data_sem is for serialising ext4_truncate() against 1042 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 1043 * data tree are chopped off during truncate. We can't do that in 1044 * ext4 because whenever we perform intermediate commits during 1045 * truncate, the inode and all the metadata blocks *must* be in a 1046 * consistent state which allows truncation of the orphans to restart 1047 * during recovery. Hence we must fix the get_block-vs-truncate race 1048 * by other means, so we have i_data_sem. 1049 */ 1050 struct rw_semaphore i_data_sem; 1051 /* 1052 * i_mmap_sem is for serializing page faults with truncate / punch hole 1053 * operations. We have to make sure that new page cannot be faulted in 1054 * a section of the inode that is being punched. We cannot easily use 1055 * i_data_sem for this since we need protection for the whole punch 1056 * operation and i_data_sem ranks below transaction start so we have 1057 * to occasionally drop it. 1058 */ 1059 struct rw_semaphore i_mmap_sem; 1060 struct inode vfs_inode; 1061 struct jbd2_inode *jinode; 1062 1063 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 1064 1065 /* 1066 * File creation time. Its function is same as that of 1067 * struct timespec64 i_{a,c,m}time in the generic inode. 1068 */ 1069 struct timespec64 i_crtime; 1070 1071 /* mballoc */ 1072 atomic_t i_prealloc_active; 1073 struct list_head i_prealloc_list; 1074 spinlock_t i_prealloc_lock; 1075 1076 /* extents status tree */ 1077 struct ext4_es_tree i_es_tree; 1078 rwlock_t i_es_lock; 1079 struct list_head i_es_list; 1080 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1081 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1082 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1083 extents to shrink. Protected by 1084 i_es_lock */ 1085 1086 /* ialloc */ 1087 ext4_group_t i_last_alloc_group; 1088 1089 /* allocation reservation info for delalloc */ 1090 /* In case of bigalloc, this refer to clusters rather than blocks */ 1091 unsigned int i_reserved_data_blocks; 1092 1093 /* pending cluster reservations for bigalloc file systems */ 1094 struct ext4_pending_tree i_pending_tree; 1095 1096 /* on-disk additional length */ 1097 __u16 i_extra_isize; 1098 1099 /* Indicate the inline data space. */ 1100 u16 i_inline_off; 1101 u16 i_inline_size; 1102 1103 #ifdef CONFIG_QUOTA 1104 /* quota space reservation, managed internally by quota code */ 1105 qsize_t i_reserved_quota; 1106 #endif 1107 1108 /* Lock protecting lists below */ 1109 spinlock_t i_completed_io_lock; 1110 /* 1111 * Completed IOs that need unwritten extents handling and have 1112 * transaction reserved 1113 */ 1114 struct list_head i_rsv_conversion_list; 1115 struct work_struct i_rsv_conversion_work; 1116 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 1117 1118 spinlock_t i_block_reservation_lock; 1119 1120 /* 1121 * Transactions that contain inode's metadata needed to complete 1122 * fsync and fdatasync, respectively. 1123 */ 1124 tid_t i_sync_tid; 1125 tid_t i_datasync_tid; 1126 1127 #ifdef CONFIG_QUOTA 1128 struct dquot *i_dquot[MAXQUOTAS]; 1129 #endif 1130 1131 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1132 __u32 i_csum_seed; 1133 1134 kprojid_t i_projid; 1135 }; 1136 1137 /* 1138 * File system states 1139 */ 1140 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1141 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1142 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1143 1144 /* 1145 * Misc. filesystem flags 1146 */ 1147 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1148 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1149 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1150 1151 /* 1152 * Mount flags set via mount options or defaults 1153 */ 1154 #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */ 1155 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1156 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1157 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1158 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1159 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1160 #define EXT4_MOUNT_ERRORS_MASK 0x00070 1161 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1162 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1163 #ifdef CONFIG_FS_DAX 1164 #define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */ 1165 #else 1166 #define EXT4_MOUNT_DAX_ALWAYS 0 1167 #endif 1168 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1169 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1170 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1171 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1172 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1173 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1174 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1175 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1176 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1177 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1178 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */ 1179 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota, 1180 * enable enforcement for hidden 1181 * quota files */ 1182 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable 1183 * enforcement for hidden quota 1184 * files */ 1185 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota 1186 * enforcement */ 1187 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1188 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1189 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1190 #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */ 1191 #define EXT4_MOUNT_PREFETCH_BLOCK_BITMAPS 0x4000000 1192 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1193 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1194 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1195 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1196 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1197 1198 /* 1199 * Mount flags set either automatically (could not be set by mount option) 1200 * based on per file system feature or property or in special cases such as 1201 * distinguishing between explicit mount option definition and default. 1202 */ 1203 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1204 specified delalloc */ 1205 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1206 size of blocksize * 8 1207 blocks */ 1208 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1209 file systems */ 1210 #define EXT4_MOUNT2_DAX_NEVER 0x00000008 /* Do not allow Direct Access */ 1211 #define EXT4_MOUNT2_DAX_INODE 0x00000010 /* For printing options only */ 1212 1213 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1214 specified journal checksum */ 1215 1216 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1217 ~EXT4_MOUNT_##opt 1218 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1219 EXT4_MOUNT_##opt 1220 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1221 EXT4_MOUNT_##opt) 1222 1223 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1224 ~EXT4_MOUNT2_##opt 1225 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1226 EXT4_MOUNT2_##opt 1227 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1228 EXT4_MOUNT2_##opt) 1229 1230 #define ext4_test_and_set_bit __test_and_set_bit_le 1231 #define ext4_set_bit __set_bit_le 1232 #define ext4_set_bit_atomic ext2_set_bit_atomic 1233 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1234 #define ext4_clear_bit __clear_bit_le 1235 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1236 #define ext4_test_bit test_bit_le 1237 #define ext4_find_next_zero_bit find_next_zero_bit_le 1238 #define ext4_find_next_bit find_next_bit_le 1239 1240 extern void ext4_set_bits(void *bm, int cur, int len); 1241 1242 /* 1243 * Maximal mount counts between two filesystem checks 1244 */ 1245 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1246 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1247 1248 /* 1249 * Behaviour when detecting errors 1250 */ 1251 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1252 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1253 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1254 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1255 1256 /* Metadata checksum algorithm codes */ 1257 #define EXT4_CRC32C_CHKSUM 1 1258 1259 /* 1260 * Structure of the super block 1261 */ 1262 struct ext4_super_block { 1263 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1264 __le32 s_blocks_count_lo; /* Blocks count */ 1265 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1266 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1267 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1268 __le32 s_first_data_block; /* First Data Block */ 1269 __le32 s_log_block_size; /* Block size */ 1270 __le32 s_log_cluster_size; /* Allocation cluster size */ 1271 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1272 __le32 s_clusters_per_group; /* # Clusters per group */ 1273 __le32 s_inodes_per_group; /* # Inodes per group */ 1274 __le32 s_mtime; /* Mount time */ 1275 /*30*/ __le32 s_wtime; /* Write time */ 1276 __le16 s_mnt_count; /* Mount count */ 1277 __le16 s_max_mnt_count; /* Maximal mount count */ 1278 __le16 s_magic; /* Magic signature */ 1279 __le16 s_state; /* File system state */ 1280 __le16 s_errors; /* Behaviour when detecting errors */ 1281 __le16 s_minor_rev_level; /* minor revision level */ 1282 /*40*/ __le32 s_lastcheck; /* time of last check */ 1283 __le32 s_checkinterval; /* max. time between checks */ 1284 __le32 s_creator_os; /* OS */ 1285 __le32 s_rev_level; /* Revision level */ 1286 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1287 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1288 /* 1289 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1290 * 1291 * Note: the difference between the compatible feature set and 1292 * the incompatible feature set is that if there is a bit set 1293 * in the incompatible feature set that the kernel doesn't 1294 * know about, it should refuse to mount the filesystem. 1295 * 1296 * e2fsck's requirements are more strict; if it doesn't know 1297 * about a feature in either the compatible or incompatible 1298 * feature set, it must abort and not try to meddle with 1299 * things it doesn't understand... 1300 */ 1301 __le32 s_first_ino; /* First non-reserved inode */ 1302 __le16 s_inode_size; /* size of inode structure */ 1303 __le16 s_block_group_nr; /* block group # of this superblock */ 1304 __le32 s_feature_compat; /* compatible feature set */ 1305 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1306 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1307 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1308 /*78*/ char s_volume_name[16]; /* volume name */ 1309 /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */ 1310 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1311 /* 1312 * Performance hints. Directory preallocation should only 1313 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1314 */ 1315 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1316 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1317 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1318 /* 1319 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1320 */ 1321 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1322 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1323 __le32 s_journal_dev; /* device number of journal file */ 1324 __le32 s_last_orphan; /* start of list of inodes to delete */ 1325 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1326 __u8 s_def_hash_version; /* Default hash version to use */ 1327 __u8 s_jnl_backup_type; 1328 __le16 s_desc_size; /* size of group descriptor */ 1329 /*100*/ __le32 s_default_mount_opts; 1330 __le32 s_first_meta_bg; /* First metablock block group */ 1331 __le32 s_mkfs_time; /* When the filesystem was created */ 1332 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1333 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1334 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1335 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1336 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1337 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1338 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1339 __le32 s_flags; /* Miscellaneous flags */ 1340 __le16 s_raid_stride; /* RAID stride */ 1341 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1342 __le64 s_mmp_block; /* Block for multi-mount protection */ 1343 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1344 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1345 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1346 __u8 s_encryption_level; /* versioning level for encryption */ 1347 __u8 s_reserved_pad; /* Padding to next 32bits */ 1348 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1349 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1350 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1351 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1352 snapshot's future use */ 1353 __le32 s_snapshot_list; /* inode number of the head of the 1354 on-disk snapshot list */ 1355 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1356 __le32 s_error_count; /* number of fs errors */ 1357 __le32 s_first_error_time; /* first time an error happened */ 1358 __le32 s_first_error_ino; /* inode involved in first error */ 1359 __le64 s_first_error_block; /* block involved of first error */ 1360 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */ 1361 __le32 s_first_error_line; /* line number where error happened */ 1362 __le32 s_last_error_time; /* most recent time of an error */ 1363 __le32 s_last_error_ino; /* inode involved in last error */ 1364 __le32 s_last_error_line; /* line number where error happened */ 1365 __le64 s_last_error_block; /* block involved of last error */ 1366 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */ 1367 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1368 __u8 s_mount_opts[64]; 1369 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1370 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1371 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1372 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1373 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1374 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1375 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1376 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1377 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1378 __u8 s_wtime_hi; 1379 __u8 s_mtime_hi; 1380 __u8 s_mkfs_time_hi; 1381 __u8 s_lastcheck_hi; 1382 __u8 s_first_error_time_hi; 1383 __u8 s_last_error_time_hi; 1384 __u8 s_first_error_errcode; 1385 __u8 s_last_error_errcode; 1386 __le16 s_encoding; /* Filename charset encoding */ 1387 __le16 s_encoding_flags; /* Filename charset encoding flags */ 1388 __le32 s_reserved[95]; /* Padding to the end of the block */ 1389 __le32 s_checksum; /* crc32c(superblock) */ 1390 }; 1391 1392 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1393 1394 #ifdef __KERNEL__ 1395 1396 /* 1397 * run-time mount flags 1398 */ 1399 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1400 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1401 1402 #ifdef CONFIG_FS_ENCRYPTION 1403 #define DUMMY_ENCRYPTION_ENABLED(sbi) ((sbi)->s_dummy_enc_ctx.ctx != NULL) 1404 #else 1405 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0) 1406 #endif 1407 1408 /* Number of quota types we support */ 1409 #define EXT4_MAXQUOTAS 3 1410 1411 #define EXT4_ENC_UTF8_12_1 1 1412 1413 /* 1414 * Flags for ext4_sb_info.s_encoding_flags. 1415 */ 1416 #define EXT4_ENC_STRICT_MODE_FL (1 << 0) 1417 1418 #define ext4_has_strict_mode(sbi) \ 1419 (sbi->s_encoding_flags & EXT4_ENC_STRICT_MODE_FL) 1420 1421 /* 1422 * fourth extended-fs super-block data in memory 1423 */ 1424 struct ext4_sb_info { 1425 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1426 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1427 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1428 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1429 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1430 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1431 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1432 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1433 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1434 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1435 unsigned long s_overhead; /* # of fs overhead clusters */ 1436 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1437 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1438 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1439 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1440 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1441 struct buffer_head * __rcu *s_group_desc; 1442 unsigned int s_mount_opt; 1443 unsigned int s_mount_opt2; 1444 unsigned int s_mount_flags; 1445 unsigned int s_def_mount_opt; 1446 ext4_fsblk_t s_sb_block; 1447 atomic64_t s_resv_clusters; 1448 kuid_t s_resuid; 1449 kgid_t s_resgid; 1450 unsigned short s_mount_state; 1451 unsigned short s_pad; 1452 int s_addr_per_block_bits; 1453 int s_desc_per_block_bits; 1454 int s_inode_size; 1455 int s_first_ino; 1456 unsigned int s_inode_readahead_blks; 1457 unsigned int s_inode_goal; 1458 u32 s_hash_seed[4]; 1459 int s_def_hash_version; 1460 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1461 struct percpu_counter s_freeclusters_counter; 1462 struct percpu_counter s_freeinodes_counter; 1463 struct percpu_counter s_dirs_counter; 1464 struct percpu_counter s_dirtyclusters_counter; 1465 struct blockgroup_lock *s_blockgroup_lock; 1466 struct proc_dir_entry *s_proc; 1467 struct kobject s_kobj; 1468 struct completion s_kobj_unregister; 1469 struct super_block *s_sb; 1470 #ifdef CONFIG_UNICODE 1471 struct unicode_map *s_encoding; 1472 __u16 s_encoding_flags; 1473 #endif 1474 1475 /* Journaling */ 1476 struct journal_s *s_journal; 1477 struct list_head s_orphan; 1478 struct mutex s_orphan_lock; 1479 unsigned long s_ext4_flags; /* Ext4 superblock flags */ 1480 unsigned long s_commit_interval; 1481 u32 s_max_batch_time; 1482 u32 s_min_batch_time; 1483 struct block_device *s_journal_bdev; 1484 #ifdef CONFIG_QUOTA 1485 /* Names of quota files with journalled quota */ 1486 char __rcu *s_qf_names[EXT4_MAXQUOTAS]; 1487 int s_jquota_fmt; /* Format of quota to use */ 1488 #endif 1489 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1490 struct ext4_system_blocks __rcu *s_system_blks; 1491 1492 #ifdef EXTENTS_STATS 1493 /* ext4 extents stats */ 1494 unsigned long s_ext_min; 1495 unsigned long s_ext_max; 1496 unsigned long s_depth_max; 1497 spinlock_t s_ext_stats_lock; 1498 unsigned long s_ext_blocks; 1499 unsigned long s_ext_extents; 1500 #endif 1501 1502 /* for buddy allocator */ 1503 struct ext4_group_info ** __rcu *s_group_info; 1504 struct inode *s_buddy_cache; 1505 spinlock_t s_md_lock; 1506 unsigned short *s_mb_offsets; 1507 unsigned int *s_mb_maxs; 1508 unsigned int s_group_info_size; 1509 unsigned int s_mb_free_pending; 1510 struct list_head s_freed_data_list; /* List of blocks to be freed 1511 after commit completed */ 1512 1513 /* tunables */ 1514 unsigned long s_stripe; 1515 unsigned int s_mb_stream_request; 1516 unsigned int s_mb_max_to_scan; 1517 unsigned int s_mb_min_to_scan; 1518 unsigned int s_mb_stats; 1519 unsigned int s_mb_order2_reqs; 1520 unsigned int s_mb_group_prealloc; 1521 unsigned int s_mb_max_inode_prealloc; 1522 unsigned int s_max_dir_size_kb; 1523 /* where last allocation was done - for stream allocation */ 1524 unsigned long s_mb_last_group; 1525 unsigned long s_mb_last_start; 1526 unsigned int s_mb_prefetch; 1527 unsigned int s_mb_prefetch_limit; 1528 1529 /* stats for buddy allocator */ 1530 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1531 atomic_t s_bal_success; /* we found long enough chunks */ 1532 atomic_t s_bal_allocated; /* in blocks */ 1533 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1534 atomic_t s_bal_goals; /* goal hits */ 1535 atomic_t s_bal_breaks; /* too long searches */ 1536 atomic_t s_bal_2orders; /* 2^order hits */ 1537 spinlock_t s_bal_lock; 1538 unsigned long s_mb_buddies_generated; 1539 unsigned long long s_mb_generation_time; 1540 atomic_t s_mb_lost_chunks; 1541 atomic_t s_mb_preallocated; 1542 atomic_t s_mb_discarded; 1543 atomic_t s_lock_busy; 1544 1545 /* locality groups */ 1546 struct ext4_locality_group __percpu *s_locality_groups; 1547 1548 /* for write statistics */ 1549 unsigned long s_sectors_written_start; 1550 u64 s_kbytes_written; 1551 1552 /* the size of zero-out chunk */ 1553 unsigned int s_extent_max_zeroout_kb; 1554 1555 unsigned int s_log_groups_per_flex; 1556 struct flex_groups * __rcu *s_flex_groups; 1557 ext4_group_t s_flex_groups_allocated; 1558 1559 /* workqueue for reserved extent conversions (buffered io) */ 1560 struct workqueue_struct *rsv_conversion_wq; 1561 1562 /* timer for periodic error stats printing */ 1563 struct timer_list s_err_report; 1564 1565 /* Lazy inode table initialization info */ 1566 struct ext4_li_request *s_li_request; 1567 /* Wait multiplier for lazy initialization thread */ 1568 unsigned int s_li_wait_mult; 1569 1570 /* Kernel thread for multiple mount protection */ 1571 struct task_struct *s_mmp_tsk; 1572 1573 /* record the last minlen when FITRIM is called. */ 1574 atomic_t s_last_trim_minblks; 1575 1576 /* Reference to checksum algorithm driver via cryptoapi */ 1577 struct crypto_shash *s_chksum_driver; 1578 1579 /* Precomputed FS UUID checksum for seeding other checksums */ 1580 __u32 s_csum_seed; 1581 1582 /* Reclaim extents from extent status tree */ 1583 struct shrinker s_es_shrinker; 1584 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1585 long s_es_nr_inode; 1586 struct ext4_es_stats s_es_stats; 1587 struct mb_cache *s_ea_block_cache; 1588 struct mb_cache *s_ea_inode_cache; 1589 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1590 1591 /* Ratelimit ext4 messages. */ 1592 struct ratelimit_state s_err_ratelimit_state; 1593 struct ratelimit_state s_warning_ratelimit_state; 1594 struct ratelimit_state s_msg_ratelimit_state; 1595 atomic_t s_warning_count; 1596 atomic_t s_msg_count; 1597 1598 /* Encryption context for '-o test_dummy_encryption' */ 1599 struct fscrypt_dummy_context s_dummy_enc_ctx; 1600 1601 /* 1602 * Barrier between writepages ops and changing any inode's JOURNAL_DATA 1603 * or EXTENTS flag. 1604 */ 1605 struct percpu_rw_semaphore s_writepages_rwsem; 1606 struct dax_device *s_daxdev; 1607 #ifdef CONFIG_EXT4_DEBUG 1608 unsigned long s_simulate_fail; 1609 #endif 1610 /* Record the errseq of the backing block device */ 1611 errseq_t s_bdev_wb_err; 1612 spinlock_t s_bdev_wb_lock; 1613 }; 1614 1615 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1616 { 1617 return sb->s_fs_info; 1618 } 1619 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1620 { 1621 return container_of(inode, struct ext4_inode_info, vfs_inode); 1622 } 1623 1624 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1625 { 1626 return ino == EXT4_ROOT_INO || 1627 (ino >= EXT4_FIRST_INO(sb) && 1628 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1629 } 1630 1631 /* 1632 * Returns: sbi->field[index] 1633 * Used to access an array element from the following sbi fields which require 1634 * rcu protection to avoid dereferencing an invalid pointer due to reassignment 1635 * - s_group_desc 1636 * - s_group_info 1637 * - s_flex_group 1638 */ 1639 #define sbi_array_rcu_deref(sbi, field, index) \ 1640 ({ \ 1641 typeof(*((sbi)->field)) _v; \ 1642 rcu_read_lock(); \ 1643 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \ 1644 rcu_read_unlock(); \ 1645 _v; \ 1646 }) 1647 1648 /* 1649 * Simulate_fail codes 1650 */ 1651 #define EXT4_SIM_BBITMAP_EIO 1 1652 #define EXT4_SIM_BBITMAP_CRC 2 1653 #define EXT4_SIM_IBITMAP_EIO 3 1654 #define EXT4_SIM_IBITMAP_CRC 4 1655 #define EXT4_SIM_INODE_EIO 5 1656 #define EXT4_SIM_INODE_CRC 6 1657 #define EXT4_SIM_DIRBLOCK_EIO 7 1658 #define EXT4_SIM_DIRBLOCK_CRC 8 1659 1660 static inline bool ext4_simulate_fail(struct super_block *sb, 1661 unsigned long code) 1662 { 1663 #ifdef CONFIG_EXT4_DEBUG 1664 struct ext4_sb_info *sbi = EXT4_SB(sb); 1665 1666 if (unlikely(sbi->s_simulate_fail == code)) { 1667 sbi->s_simulate_fail = 0; 1668 return true; 1669 } 1670 #endif 1671 return false; 1672 } 1673 1674 static inline void ext4_simulate_fail_bh(struct super_block *sb, 1675 struct buffer_head *bh, 1676 unsigned long code) 1677 { 1678 if (!IS_ERR(bh) && ext4_simulate_fail(sb, code)) 1679 clear_buffer_uptodate(bh); 1680 } 1681 1682 /* 1683 * Error number codes for s_{first,last}_error_errno 1684 * 1685 * Linux errno numbers are architecture specific, so we need to translate 1686 * them into something which is architecture independent. We don't define 1687 * codes for all errno's; just the ones which are most likely to be the cause 1688 * of an ext4_error() call. 1689 */ 1690 #define EXT4_ERR_UNKNOWN 1 1691 #define EXT4_ERR_EIO 2 1692 #define EXT4_ERR_ENOMEM 3 1693 #define EXT4_ERR_EFSBADCRC 4 1694 #define EXT4_ERR_EFSCORRUPTED 5 1695 #define EXT4_ERR_ENOSPC 6 1696 #define EXT4_ERR_ENOKEY 7 1697 #define EXT4_ERR_EROFS 8 1698 #define EXT4_ERR_EFBIG 9 1699 #define EXT4_ERR_EEXIST 10 1700 #define EXT4_ERR_ERANGE 11 1701 #define EXT4_ERR_EOVERFLOW 12 1702 #define EXT4_ERR_EBUSY 13 1703 #define EXT4_ERR_ENOTDIR 14 1704 #define EXT4_ERR_ENOTEMPTY 15 1705 #define EXT4_ERR_ESHUTDOWN 16 1706 #define EXT4_ERR_EFAULT 17 1707 1708 /* 1709 * Inode dynamic state flags 1710 */ 1711 enum { 1712 EXT4_STATE_JDATA, /* journaled data exists */ 1713 EXT4_STATE_NEW, /* inode is newly created */ 1714 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1715 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1716 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1717 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1718 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1719 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1720 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1721 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */ 1722 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */ 1723 }; 1724 1725 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1726 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1727 { \ 1728 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1729 } \ 1730 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1731 { \ 1732 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1733 } \ 1734 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1735 { \ 1736 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1737 } 1738 1739 /* Add these declarations here only so that these functions can be 1740 * found by name. Otherwise, they are very hard to locate. */ 1741 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1742 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1743 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1744 EXT4_INODE_BIT_FNS(flag, flags, 0) 1745 1746 /* Add these declarations here only so that these functions can be 1747 * found by name. Otherwise, they are very hard to locate. */ 1748 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1749 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1750 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1751 #if (BITS_PER_LONG < 64) 1752 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1753 1754 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1755 { 1756 (ei)->i_state_flags = 0; 1757 } 1758 #else 1759 EXT4_INODE_BIT_FNS(state, flags, 32) 1760 1761 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1762 { 1763 /* We depend on the fact that callers will set i_flags */ 1764 } 1765 #endif 1766 #else 1767 /* Assume that user mode programs are passing in an ext4fs superblock, not 1768 * a kernel struct super_block. This will allow us to call the feature-test 1769 * macros from user land. */ 1770 #define EXT4_SB(sb) (sb) 1771 #endif 1772 1773 static inline bool ext4_verity_in_progress(struct inode *inode) 1774 { 1775 return IS_ENABLED(CONFIG_FS_VERITY) && 1776 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS); 1777 } 1778 1779 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1780 1781 /* 1782 * Codes for operating systems 1783 */ 1784 #define EXT4_OS_LINUX 0 1785 #define EXT4_OS_HURD 1 1786 #define EXT4_OS_MASIX 2 1787 #define EXT4_OS_FREEBSD 3 1788 #define EXT4_OS_LITES 4 1789 1790 /* 1791 * Revision levels 1792 */ 1793 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1794 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1795 1796 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1797 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1798 1799 #define EXT4_GOOD_OLD_INODE_SIZE 128 1800 1801 #define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN) 1802 #define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX 1803 #define EXT4_TIMESTAMP_MIN S32_MIN 1804 1805 /* 1806 * Feature set definitions 1807 */ 1808 1809 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1810 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1811 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1812 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1813 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1814 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1815 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1816 #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800 1817 1818 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1819 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1820 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1821 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1822 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1823 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1824 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1825 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1826 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1827 /* 1828 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1829 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1830 * all other data structures' checksums. However, the METADATA_CSUM and 1831 * GDT_CSUM bits are mutually exclusive. 1832 */ 1833 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1834 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1835 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 1836 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000 1837 1838 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1839 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1840 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1841 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1842 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1843 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1844 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1845 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1846 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1847 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1848 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1849 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 1850 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1851 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1852 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1853 #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000 1854 1855 extern void ext4_update_dynamic_rev(struct super_block *sb); 1856 1857 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 1858 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1859 { \ 1860 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1861 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 1862 } \ 1863 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1864 { \ 1865 ext4_update_dynamic_rev(sb); \ 1866 EXT4_SB(sb)->s_es->s_feature_compat |= \ 1867 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1868 } \ 1869 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1870 { \ 1871 EXT4_SB(sb)->s_es->s_feature_compat &= \ 1872 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1873 } 1874 1875 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 1876 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1877 { \ 1878 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1879 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 1880 } \ 1881 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1882 { \ 1883 ext4_update_dynamic_rev(sb); \ 1884 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 1885 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1886 } \ 1887 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1888 { \ 1889 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 1890 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1891 } 1892 1893 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 1894 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1895 { \ 1896 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1897 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 1898 } \ 1899 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1900 { \ 1901 ext4_update_dynamic_rev(sb); \ 1902 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 1903 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1904 } \ 1905 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1906 { \ 1907 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 1908 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1909 } 1910 1911 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 1912 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 1913 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 1914 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 1915 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 1916 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 1917 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 1918 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES) 1919 1920 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 1921 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 1922 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 1923 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 1924 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 1925 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 1926 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 1927 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 1928 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 1929 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 1930 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 1931 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 1932 EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY) 1933 1934 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 1935 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 1936 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 1937 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 1938 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 1939 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 1940 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 1941 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 1942 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 1943 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 1944 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 1945 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 1946 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 1947 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 1948 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 1949 EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD) 1950 1951 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1952 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1953 EXT4_FEATURE_INCOMPAT_META_BG) 1954 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1955 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1956 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1957 1958 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1959 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1960 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1961 EXT4_FEATURE_INCOMPAT_META_BG) 1962 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1963 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1964 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1965 1966 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1967 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1968 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1969 EXT4_FEATURE_INCOMPAT_META_BG| \ 1970 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1971 EXT4_FEATURE_INCOMPAT_64BIT| \ 1972 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1973 EXT4_FEATURE_INCOMPAT_EA_INODE| \ 1974 EXT4_FEATURE_INCOMPAT_MMP | \ 1975 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 1976 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 1977 EXT4_FEATURE_INCOMPAT_CASEFOLD | \ 1978 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \ 1979 EXT4_FEATURE_INCOMPAT_LARGEDIR) 1980 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1981 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1982 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1983 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1984 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1985 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1986 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1987 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1988 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1989 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 1990 EXT4_FEATURE_RO_COMPAT_PROJECT |\ 1991 EXT4_FEATURE_RO_COMPAT_VERITY) 1992 1993 #define EXTN_FEATURE_FUNCS(ver) \ 1994 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 1995 { \ 1996 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1997 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 1998 } \ 1999 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 2000 { \ 2001 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 2002 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 2003 } \ 2004 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 2005 { \ 2006 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 2007 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 2008 } 2009 2010 EXTN_FEATURE_FUNCS(2) 2011 EXTN_FEATURE_FUNCS(3) 2012 EXTN_FEATURE_FUNCS(4) 2013 2014 static inline bool ext4_has_compat_features(struct super_block *sb) 2015 { 2016 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 2017 } 2018 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 2019 { 2020 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 2021 } 2022 static inline bool ext4_has_incompat_features(struct super_block *sb) 2023 { 2024 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 2025 } 2026 2027 /* 2028 * Superblock flags 2029 */ 2030 #define EXT4_FLAGS_RESIZING 0 2031 #define EXT4_FLAGS_SHUTDOWN 1 2032 #define EXT4_FLAGS_BDEV_IS_DAX 2 2033 2034 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi) 2035 { 2036 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 2037 } 2038 2039 2040 /* 2041 * Default values for user and/or group using reserved blocks 2042 */ 2043 #define EXT4_DEF_RESUID 0 2044 #define EXT4_DEF_RESGID 0 2045 2046 /* 2047 * Default project ID 2048 */ 2049 #define EXT4_DEF_PROJID 0 2050 2051 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 2052 2053 /* 2054 * Default mount options 2055 */ 2056 #define EXT4_DEFM_DEBUG 0x0001 2057 #define EXT4_DEFM_BSDGROUPS 0x0002 2058 #define EXT4_DEFM_XATTR_USER 0x0004 2059 #define EXT4_DEFM_ACL 0x0008 2060 #define EXT4_DEFM_UID16 0x0010 2061 #define EXT4_DEFM_JMODE 0x0060 2062 #define EXT4_DEFM_JMODE_DATA 0x0020 2063 #define EXT4_DEFM_JMODE_ORDERED 0x0040 2064 #define EXT4_DEFM_JMODE_WBACK 0x0060 2065 #define EXT4_DEFM_NOBARRIER 0x0100 2066 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 2067 #define EXT4_DEFM_DISCARD 0x0400 2068 #define EXT4_DEFM_NODELALLOC 0x0800 2069 2070 /* 2071 * Default journal batch times 2072 */ 2073 #define EXT4_DEF_MIN_BATCH_TIME 0 2074 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 2075 2076 /* 2077 * Minimum number of groups in a flexgroup before we separate out 2078 * directories into the first block group of a flexgroup 2079 */ 2080 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 2081 2082 /* 2083 * Structure of a directory entry 2084 */ 2085 #define EXT4_NAME_LEN 255 2086 2087 struct ext4_dir_entry { 2088 __le32 inode; /* Inode number */ 2089 __le16 rec_len; /* Directory entry length */ 2090 __le16 name_len; /* Name length */ 2091 char name[EXT4_NAME_LEN]; /* File name */ 2092 }; 2093 2094 /* 2095 * The new version of the directory entry. Since EXT4 structures are 2096 * stored in intel byte order, and the name_len field could never be 2097 * bigger than 255 chars, it's safe to reclaim the extra byte for the 2098 * file_type field. 2099 */ 2100 struct ext4_dir_entry_2 { 2101 __le32 inode; /* Inode number */ 2102 __le16 rec_len; /* Directory entry length */ 2103 __u8 name_len; /* Name length */ 2104 __u8 file_type; /* See file type macros EXT4_FT_* below */ 2105 char name[EXT4_NAME_LEN]; /* File name */ 2106 }; 2107 2108 /* 2109 * This is a bogus directory entry at the end of each leaf block that 2110 * records checksums. 2111 */ 2112 struct ext4_dir_entry_tail { 2113 __le32 det_reserved_zero1; /* Pretend to be unused */ 2114 __le16 det_rec_len; /* 12 */ 2115 __u8 det_reserved_zero2; /* Zero name length */ 2116 __u8 det_reserved_ft; /* 0xDE, fake file type */ 2117 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 2118 }; 2119 2120 #define EXT4_DIRENT_TAIL(block, blocksize) \ 2121 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 2122 ((blocksize) - \ 2123 sizeof(struct ext4_dir_entry_tail)))) 2124 2125 /* 2126 * Ext4 directory file types. Only the low 3 bits are used. The 2127 * other bits are reserved for now. 2128 */ 2129 #define EXT4_FT_UNKNOWN 0 2130 #define EXT4_FT_REG_FILE 1 2131 #define EXT4_FT_DIR 2 2132 #define EXT4_FT_CHRDEV 3 2133 #define EXT4_FT_BLKDEV 4 2134 #define EXT4_FT_FIFO 5 2135 #define EXT4_FT_SOCK 6 2136 #define EXT4_FT_SYMLINK 7 2137 2138 #define EXT4_FT_MAX 8 2139 2140 #define EXT4_FT_DIR_CSUM 0xDE 2141 2142 /* 2143 * EXT4_DIR_PAD defines the directory entries boundaries 2144 * 2145 * NOTE: It must be a multiple of 4 2146 */ 2147 #define EXT4_DIR_PAD 4 2148 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 2149 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 2150 ~EXT4_DIR_ROUND) 2151 #define EXT4_MAX_REC_LEN ((1<<16)-1) 2152 2153 /* 2154 * If we ever get support for fs block sizes > page_size, we'll need 2155 * to remove the #if statements in the next two functions... 2156 */ 2157 static inline unsigned int 2158 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 2159 { 2160 unsigned len = le16_to_cpu(dlen); 2161 2162 #if (PAGE_SIZE >= 65536) 2163 if (len == EXT4_MAX_REC_LEN || len == 0) 2164 return blocksize; 2165 return (len & 65532) | ((len & 3) << 16); 2166 #else 2167 return len; 2168 #endif 2169 } 2170 2171 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 2172 { 2173 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 2174 BUG(); 2175 #if (PAGE_SIZE >= 65536) 2176 if (len < 65536) 2177 return cpu_to_le16(len); 2178 if (len == blocksize) { 2179 if (blocksize == 65536) 2180 return cpu_to_le16(EXT4_MAX_REC_LEN); 2181 else 2182 return cpu_to_le16(0); 2183 } 2184 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 2185 #else 2186 return cpu_to_le16(len); 2187 #endif 2188 } 2189 2190 /* 2191 * Hash Tree Directory indexing 2192 * (c) Daniel Phillips, 2001 2193 */ 2194 2195 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2196 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2197 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \ 2198 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir))) 2199 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2200 2201 /* Legal values for the dx_root hash_version field: */ 2202 2203 #define DX_HASH_LEGACY 0 2204 #define DX_HASH_HALF_MD4 1 2205 #define DX_HASH_TEA 2 2206 #define DX_HASH_LEGACY_UNSIGNED 3 2207 #define DX_HASH_HALF_MD4_UNSIGNED 4 2208 #define DX_HASH_TEA_UNSIGNED 5 2209 2210 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 2211 const void *address, unsigned int length) 2212 { 2213 struct { 2214 struct shash_desc shash; 2215 char ctx[4]; 2216 } desc; 2217 2218 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2219 2220 desc.shash.tfm = sbi->s_chksum_driver; 2221 *(u32 *)desc.ctx = crc; 2222 2223 BUG_ON(crypto_shash_update(&desc.shash, address, length)); 2224 2225 return *(u32 *)desc.ctx; 2226 } 2227 2228 #ifdef __KERNEL__ 2229 2230 /* hash info structure used by the directory hash */ 2231 struct dx_hash_info 2232 { 2233 u32 hash; 2234 u32 minor_hash; 2235 int hash_version; 2236 u32 *seed; 2237 }; 2238 2239 2240 /* 32 and 64 bit signed EOF for dx directories */ 2241 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2242 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2243 2244 2245 /* 2246 * Control parameters used by ext4_htree_next_block 2247 */ 2248 #define HASH_NB_ALWAYS 1 2249 2250 struct ext4_filename { 2251 const struct qstr *usr_fname; 2252 struct fscrypt_str disk_name; 2253 struct dx_hash_info hinfo; 2254 #ifdef CONFIG_FS_ENCRYPTION 2255 struct fscrypt_str crypto_buf; 2256 #endif 2257 #ifdef CONFIG_UNICODE 2258 struct fscrypt_str cf_name; 2259 #endif 2260 }; 2261 2262 #define fname_name(p) ((p)->disk_name.name) 2263 #define fname_len(p) ((p)->disk_name.len) 2264 2265 /* 2266 * Describe an inode's exact location on disk and in memory 2267 */ 2268 struct ext4_iloc 2269 { 2270 struct buffer_head *bh; 2271 unsigned long offset; 2272 ext4_group_t block_group; 2273 }; 2274 2275 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2276 { 2277 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2278 } 2279 2280 static inline bool ext4_is_quota_file(struct inode *inode) 2281 { 2282 return IS_NOQUOTA(inode) && 2283 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL); 2284 } 2285 2286 /* 2287 * This structure is stuffed into the struct file's private_data field 2288 * for directories. It is where we put information so that we can do 2289 * readdir operations in hash tree order. 2290 */ 2291 struct dir_private_info { 2292 struct rb_root root; 2293 struct rb_node *curr_node; 2294 struct fname *extra_fname; 2295 loff_t last_pos; 2296 __u32 curr_hash; 2297 __u32 curr_minor_hash; 2298 __u32 next_hash; 2299 }; 2300 2301 /* calculate the first block number of the group */ 2302 static inline ext4_fsblk_t 2303 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2304 { 2305 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2306 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2307 } 2308 2309 /* 2310 * Special error return code only used by dx_probe() and its callers. 2311 */ 2312 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2313 2314 /* htree levels for ext4 */ 2315 #define EXT4_HTREE_LEVEL_COMPAT 2 2316 #define EXT4_HTREE_LEVEL 3 2317 2318 static inline int ext4_dir_htree_level(struct super_block *sb) 2319 { 2320 return ext4_has_feature_largedir(sb) ? 2321 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT; 2322 } 2323 2324 /* 2325 * Timeout and state flag for lazy initialization inode thread. 2326 */ 2327 #define EXT4_DEF_LI_WAIT_MULT 10 2328 #define EXT4_DEF_LI_MAX_START_DELAY 5 2329 #define EXT4_LAZYINIT_QUIT 0x0001 2330 #define EXT4_LAZYINIT_RUNNING 0x0002 2331 2332 /* 2333 * Lazy inode table initialization info 2334 */ 2335 struct ext4_lazy_init { 2336 unsigned long li_state; 2337 struct list_head li_request_list; 2338 struct mutex li_list_mtx; 2339 }; 2340 2341 enum ext4_li_mode { 2342 EXT4_LI_MODE_PREFETCH_BBITMAP, 2343 EXT4_LI_MODE_ITABLE, 2344 }; 2345 2346 struct ext4_li_request { 2347 struct super_block *lr_super; 2348 enum ext4_li_mode lr_mode; 2349 ext4_group_t lr_first_not_zeroed; 2350 ext4_group_t lr_next_group; 2351 struct list_head lr_request; 2352 unsigned long lr_next_sched; 2353 unsigned long lr_timeout; 2354 }; 2355 2356 struct ext4_features { 2357 struct kobject f_kobj; 2358 struct completion f_kobj_unregister; 2359 }; 2360 2361 /* 2362 * This structure will be used for multiple mount protection. It will be 2363 * written into the block number saved in the s_mmp_block field in the 2364 * superblock. Programs that check MMP should assume that if 2365 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2366 * to use the filesystem, regardless of how old the timestamp is. 2367 */ 2368 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2369 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2370 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2371 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2372 2373 struct mmp_struct { 2374 __le32 mmp_magic; /* Magic number for MMP */ 2375 __le32 mmp_seq; /* Sequence no. updated periodically */ 2376 2377 /* 2378 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2379 * purposes and do not affect the correctness of the algorithm 2380 */ 2381 __le64 mmp_time; /* Time last updated */ 2382 char mmp_nodename[64]; /* Node which last updated MMP block */ 2383 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2384 2385 /* 2386 * mmp_check_interval is used to verify if the MMP block has been 2387 * updated on the block device. The value is updated based on the 2388 * maximum time to write the MMP block during an update cycle. 2389 */ 2390 __le16 mmp_check_interval; 2391 2392 __le16 mmp_pad1; 2393 __le32 mmp_pad2[226]; 2394 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2395 }; 2396 2397 /* arguments passed to the mmp thread */ 2398 struct mmpd_data { 2399 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2400 struct super_block *sb; /* super block of the fs */ 2401 }; 2402 2403 /* 2404 * Check interval multiplier 2405 * The MMP block is written every update interval and initially checked every 2406 * update interval x the multiplier (the value is then adapted based on the 2407 * write latency). The reason is that writes can be delayed under load and we 2408 * don't want readers to incorrectly assume that the filesystem is no longer 2409 * in use. 2410 */ 2411 #define EXT4_MMP_CHECK_MULT 2UL 2412 2413 /* 2414 * Minimum interval for MMP checking in seconds. 2415 */ 2416 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2417 2418 /* 2419 * Maximum interval for MMP checking in seconds. 2420 */ 2421 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2422 2423 /* 2424 * Function prototypes 2425 */ 2426 2427 /* 2428 * Ok, these declarations are also in <linux/kernel.h> but none of the 2429 * ext4 source programs needs to include it so they are duplicated here. 2430 */ 2431 # define NORET_TYPE /**/ 2432 # define ATTRIB_NORET __attribute__((noreturn)) 2433 # define NORET_AND noreturn, 2434 2435 /* bitmap.c */ 2436 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2437 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2438 struct ext4_group_desc *gdp, 2439 struct buffer_head *bh, int sz); 2440 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2441 struct ext4_group_desc *gdp, 2442 struct buffer_head *bh, int sz); 2443 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2444 struct ext4_group_desc *gdp, 2445 struct buffer_head *bh); 2446 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2447 struct ext4_group_desc *gdp, 2448 struct buffer_head *bh); 2449 2450 /* balloc.c */ 2451 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2452 ext4_fsblk_t blocknr, 2453 ext4_group_t *blockgrpp, 2454 ext4_grpblk_t *offsetp); 2455 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2456 ext4_fsblk_t block); 2457 2458 extern unsigned int ext4_block_group(struct super_block *sb, 2459 ext4_fsblk_t blocknr); 2460 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2461 ext4_fsblk_t blocknr); 2462 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2463 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2464 ext4_group_t group); 2465 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2466 ext4_fsblk_t goal, 2467 unsigned int flags, 2468 unsigned long *count, 2469 int *errp); 2470 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2471 s64 nclusters, unsigned int flags); 2472 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2473 extern void ext4_check_blocks_bitmap(struct super_block *); 2474 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2475 ext4_group_t block_group, 2476 struct buffer_head ** bh); 2477 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2478 2479 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2480 ext4_group_t block_group, 2481 bool ignore_locked); 2482 extern int ext4_wait_block_bitmap(struct super_block *sb, 2483 ext4_group_t block_group, 2484 struct buffer_head *bh); 2485 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2486 ext4_group_t block_group); 2487 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2488 ext4_group_t block_group, 2489 struct ext4_group_desc *gdp); 2490 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2491 2492 #ifdef CONFIG_UNICODE 2493 extern void ext4_fname_setup_ci_filename(struct inode *dir, 2494 const struct qstr *iname, 2495 struct fscrypt_str *fname); 2496 #endif 2497 2498 #ifdef CONFIG_FS_ENCRYPTION 2499 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst, 2500 const struct fscrypt_name *src) 2501 { 2502 memset(dst, 0, sizeof(*dst)); 2503 2504 dst->usr_fname = src->usr_fname; 2505 dst->disk_name = src->disk_name; 2506 dst->hinfo.hash = src->hash; 2507 dst->hinfo.minor_hash = src->minor_hash; 2508 dst->crypto_buf = src->crypto_buf; 2509 } 2510 2511 static inline int ext4_fname_setup_filename(struct inode *dir, 2512 const struct qstr *iname, 2513 int lookup, 2514 struct ext4_filename *fname) 2515 { 2516 struct fscrypt_name name; 2517 int err; 2518 2519 err = fscrypt_setup_filename(dir, iname, lookup, &name); 2520 if (err) 2521 return err; 2522 2523 ext4_fname_from_fscrypt_name(fname, &name); 2524 2525 #ifdef CONFIG_UNICODE 2526 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name); 2527 #endif 2528 return 0; 2529 } 2530 2531 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2532 struct dentry *dentry, 2533 struct ext4_filename *fname) 2534 { 2535 struct fscrypt_name name; 2536 int err; 2537 2538 err = fscrypt_prepare_lookup(dir, dentry, &name); 2539 if (err) 2540 return err; 2541 2542 ext4_fname_from_fscrypt_name(fname, &name); 2543 2544 #ifdef CONFIG_UNICODE 2545 ext4_fname_setup_ci_filename(dir, &dentry->d_name, &fname->cf_name); 2546 #endif 2547 return 0; 2548 } 2549 2550 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2551 { 2552 struct fscrypt_name name; 2553 2554 name.crypto_buf = fname->crypto_buf; 2555 fscrypt_free_filename(&name); 2556 2557 fname->crypto_buf.name = NULL; 2558 fname->usr_fname = NULL; 2559 fname->disk_name.name = NULL; 2560 2561 #ifdef CONFIG_UNICODE 2562 kfree(fname->cf_name.name); 2563 fname->cf_name.name = NULL; 2564 #endif 2565 } 2566 #else /* !CONFIG_FS_ENCRYPTION */ 2567 static inline int ext4_fname_setup_filename(struct inode *dir, 2568 const struct qstr *iname, 2569 int lookup, 2570 struct ext4_filename *fname) 2571 { 2572 fname->usr_fname = iname; 2573 fname->disk_name.name = (unsigned char *) iname->name; 2574 fname->disk_name.len = iname->len; 2575 2576 #ifdef CONFIG_UNICODE 2577 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name); 2578 #endif 2579 2580 return 0; 2581 } 2582 2583 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2584 struct dentry *dentry, 2585 struct ext4_filename *fname) 2586 { 2587 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname); 2588 } 2589 2590 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2591 { 2592 #ifdef CONFIG_UNICODE 2593 kfree(fname->cf_name.name); 2594 fname->cf_name.name = NULL; 2595 #endif 2596 } 2597 #endif /* !CONFIG_FS_ENCRYPTION */ 2598 2599 /* dir.c */ 2600 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2601 struct file *, 2602 struct ext4_dir_entry_2 *, 2603 struct buffer_head *, char *, int, 2604 unsigned int); 2605 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2606 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2607 (de), (bh), (buf), (size), (offset))) 2608 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2609 __u32 minor_hash, 2610 struct ext4_dir_entry_2 *dirent, 2611 struct fscrypt_str *ent_name); 2612 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2613 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2614 struct buffer_head *bh, 2615 void *buf, int buf_size, 2616 struct ext4_filename *fname, 2617 struct ext4_dir_entry_2 **dest_de); 2618 void ext4_insert_dentry(struct inode *inode, 2619 struct ext4_dir_entry_2 *de, 2620 int buf_size, 2621 struct ext4_filename *fname); 2622 static inline void ext4_update_dx_flag(struct inode *inode) 2623 { 2624 if (!ext4_has_feature_dir_index(inode->i_sb)) { 2625 /* ext4_iget() should have caught this... */ 2626 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb)); 2627 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2628 } 2629 } 2630 static const unsigned char ext4_filetype_table[] = { 2631 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2632 }; 2633 2634 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2635 { 2636 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2637 return DT_UNKNOWN; 2638 2639 return ext4_filetype_table[filetype]; 2640 } 2641 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2642 void *buf, int buf_size); 2643 2644 /* fsync.c */ 2645 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2646 2647 /* hash.c */ 2648 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len, 2649 struct dx_hash_info *hinfo); 2650 2651 /* ialloc.c */ 2652 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2653 const struct qstr *qstr, __u32 goal, 2654 uid_t *owner, __u32 i_flags, 2655 int handle_type, unsigned int line_no, 2656 int nblocks); 2657 2658 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \ 2659 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2660 i_flags, 0, 0, 0) 2661 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2662 type, nblocks) \ 2663 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2664 0, (type), __LINE__, (nblocks)) 2665 2666 2667 extern void ext4_free_inode(handle_t *, struct inode *); 2668 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2669 extern unsigned long ext4_count_free_inodes(struct super_block *); 2670 extern unsigned long ext4_count_dirs(struct super_block *); 2671 extern void ext4_check_inodes_bitmap(struct super_block *); 2672 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2673 extern int ext4_init_inode_table(struct super_block *sb, 2674 ext4_group_t group, int barrier); 2675 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2676 2677 /* mballoc.c */ 2678 extern const struct seq_operations ext4_mb_seq_groups_ops; 2679 extern long ext4_mb_stats; 2680 extern long ext4_mb_max_to_scan; 2681 extern int ext4_mb_init(struct super_block *); 2682 extern int ext4_mb_release(struct super_block *); 2683 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2684 struct ext4_allocation_request *, int *); 2685 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2686 extern void ext4_discard_preallocations(struct inode *, unsigned int); 2687 extern int __init ext4_init_mballoc(void); 2688 extern void ext4_exit_mballoc(void); 2689 extern ext4_group_t ext4_mb_prefetch(struct super_block *sb, 2690 ext4_group_t group, 2691 unsigned int nr, int *cnt); 2692 extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group, 2693 unsigned int nr); 2694 2695 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2696 struct buffer_head *bh, ext4_fsblk_t block, 2697 unsigned long count, int flags); 2698 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2699 ext4_group_t ngroups); 2700 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2701 ext4_group_t i, struct ext4_group_desc *desc); 2702 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2703 ext4_fsblk_t block, unsigned long count); 2704 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2705 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid); 2706 2707 /* inode.c */ 2708 int ext4_inode_is_fast_symlink(struct inode *inode); 2709 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2710 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2711 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count, 2712 bool wait, struct buffer_head **bhs); 2713 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2714 struct buffer_head *bh_result, int create); 2715 int ext4_get_block(struct inode *inode, sector_t iblock, 2716 struct buffer_head *bh_result, int create); 2717 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2718 struct buffer_head *bh, int create); 2719 int ext4_walk_page_buffers(handle_t *handle, 2720 struct buffer_head *head, 2721 unsigned from, 2722 unsigned to, 2723 int *partial, 2724 int (*fn)(handle_t *handle, 2725 struct buffer_head *bh)); 2726 int do_journal_get_write_access(handle_t *handle, 2727 struct buffer_head *bh); 2728 #define FALL_BACK_TO_NONDELALLOC 1 2729 #define CONVERT_INLINE_DATA 2 2730 2731 typedef enum { 2732 EXT4_IGET_NORMAL = 0, 2733 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */ 2734 EXT4_IGET_HANDLE = 0x0002 /* Inode # is from a handle */ 2735 } ext4_iget_flags; 2736 2737 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, 2738 ext4_iget_flags flags, const char *function, 2739 unsigned int line); 2740 2741 #define ext4_iget(sb, ino, flags) \ 2742 __ext4_iget((sb), (ino), (flags), __func__, __LINE__) 2743 2744 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2745 extern int ext4_setattr(struct dentry *, struct iattr *); 2746 extern int ext4_getattr(const struct path *, struct kstat *, u32, unsigned int); 2747 extern void ext4_evict_inode(struct inode *); 2748 extern void ext4_clear_inode(struct inode *); 2749 extern int ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int); 2750 extern int ext4_sync_inode(handle_t *, struct inode *); 2751 extern void ext4_dirty_inode(struct inode *, int); 2752 extern int ext4_change_inode_journal_flag(struct inode *, int); 2753 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2754 extern int ext4_inode_attach_jinode(struct inode *inode); 2755 extern int ext4_can_truncate(struct inode *inode); 2756 extern int ext4_truncate(struct inode *); 2757 extern int ext4_break_layouts(struct inode *); 2758 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2759 extern void ext4_set_inode_flags(struct inode *, bool init); 2760 extern int ext4_alloc_da_blocks(struct inode *inode); 2761 extern void ext4_set_aops(struct inode *inode); 2762 extern int ext4_writepage_trans_blocks(struct inode *); 2763 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2764 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2765 loff_t lstart, loff_t lend); 2766 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf); 2767 extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf); 2768 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2769 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 2770 extern void ext4_da_release_space(struct inode *inode, int to_free); 2771 extern void ext4_da_update_reserve_space(struct inode *inode, 2772 int used, int quota_claim); 2773 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 2774 ext4_fsblk_t pblk, ext4_lblk_t len); 2775 2776 /* indirect.c */ 2777 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2778 struct ext4_map_blocks *map, int flags); 2779 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2780 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2781 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2782 ext4_lblk_t start, ext4_lblk_t end); 2783 2784 /* ioctl.c */ 2785 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2786 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2787 2788 /* migrate.c */ 2789 extern int ext4_ext_migrate(struct inode *); 2790 extern int ext4_ind_migrate(struct inode *inode); 2791 2792 /* namei.c */ 2793 extern int ext4_dirblock_csum_verify(struct inode *inode, 2794 struct buffer_head *bh); 2795 extern int ext4_orphan_add(handle_t *, struct inode *); 2796 extern int ext4_orphan_del(handle_t *, struct inode *); 2797 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2798 __u32 start_minor_hash, __u32 *next_hash); 2799 extern int ext4_search_dir(struct buffer_head *bh, 2800 char *search_buf, 2801 int buf_size, 2802 struct inode *dir, 2803 struct ext4_filename *fname, 2804 unsigned int offset, 2805 struct ext4_dir_entry_2 **res_dir); 2806 extern int ext4_generic_delete_entry(struct inode *dir, 2807 struct ext4_dir_entry_2 *de_del, 2808 struct buffer_head *bh, 2809 void *entry_buf, 2810 int buf_size, 2811 int csum_size); 2812 extern bool ext4_empty_dir(struct inode *inode); 2813 2814 /* resize.c */ 2815 extern void ext4_kvfree_array_rcu(void *to_free); 2816 extern int ext4_group_add(struct super_block *sb, 2817 struct ext4_new_group_data *input); 2818 extern int ext4_group_extend(struct super_block *sb, 2819 struct ext4_super_block *es, 2820 ext4_fsblk_t n_blocks_count); 2821 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2822 2823 /* super.c */ 2824 extern struct buffer_head *ext4_sb_bread(struct super_block *sb, 2825 sector_t block, int op_flags); 2826 extern void ext4_read_bh_nowait(struct buffer_head *bh, int op_flags, 2827 bh_end_io_t *end_io); 2828 extern int ext4_read_bh(struct buffer_head *bh, int op_flags, 2829 bh_end_io_t *end_io); 2830 extern int ext4_read_bh_lock(struct buffer_head *bh, int op_flags, bool wait); 2831 extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block); 2832 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 2833 extern int ext4_calculate_overhead(struct super_block *sb); 2834 extern void ext4_superblock_csum_set(struct super_block *sb); 2835 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2836 ext4_group_t ngroup); 2837 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2838 char nbuf[16]); 2839 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb, 2840 ext4_group_t block_group, 2841 unsigned int flags); 2842 2843 extern __printf(6, 7) 2844 void __ext4_error(struct super_block *, const char *, unsigned int, int, __u64, 2845 const char *, ...); 2846 extern __printf(6, 7) 2847 void __ext4_error_inode(struct inode *, const char *, unsigned int, 2848 ext4_fsblk_t, int, const char *, ...); 2849 extern __printf(5, 6) 2850 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2851 const char *, ...); 2852 extern void __ext4_std_error(struct super_block *, const char *, 2853 unsigned int, int); 2854 extern __printf(5, 6) 2855 void __ext4_abort(struct super_block *, const char *, unsigned int, int, 2856 const char *, ...); 2857 extern __printf(4, 5) 2858 void __ext4_warning(struct super_block *, const char *, unsigned int, 2859 const char *, ...); 2860 extern __printf(4, 5) 2861 void __ext4_warning_inode(const struct inode *inode, const char *function, 2862 unsigned int line, const char *fmt, ...); 2863 extern __printf(3, 4) 2864 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2865 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2866 const char *, unsigned int, const char *); 2867 extern __printf(7, 8) 2868 void __ext4_grp_locked_error(const char *, unsigned int, 2869 struct super_block *, ext4_group_t, 2870 unsigned long, ext4_fsblk_t, 2871 const char *, ...); 2872 2873 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 2874 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 2875 2876 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \ 2877 __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a) 2878 2879 #define ext4_error_inode_block(inode, block, err, fmt, a...) \ 2880 __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \ 2881 (fmt), ## a) 2882 2883 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 2884 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 2885 2886 #ifdef CONFIG_PRINTK 2887 2888 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2889 __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__) 2890 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 2891 __ext4_error_inode((inode), (func), (line), (block), \ 2892 (err), (fmt), ##__VA_ARGS__) 2893 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2894 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2895 #define ext4_error(sb, fmt, ...) \ 2896 __ext4_error((sb), __func__, __LINE__, 0, 0, (fmt), ##__VA_ARGS__) 2897 #define ext4_error_err(sb, err, fmt, ...) \ 2898 __ext4_error((sb), __func__, __LINE__, (err), 0, (fmt), ##__VA_ARGS__) 2899 #define ext4_abort(sb, err, fmt, ...) \ 2900 __ext4_abort((sb), __func__, __LINE__, (err), (fmt), ##__VA_ARGS__) 2901 #define ext4_warning(sb, fmt, ...) \ 2902 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2903 #define ext4_warning_inode(inode, fmt, ...) \ 2904 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 2905 #define ext4_msg(sb, level, fmt, ...) \ 2906 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 2907 #define dump_mmp_msg(sb, mmp, msg) \ 2908 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 2909 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2910 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 2911 fmt, ##__VA_ARGS__) 2912 2913 #else 2914 2915 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2916 do { \ 2917 no_printk(fmt, ##__VA_ARGS__); \ 2918 __ext4_error_inode(inode, "", 0, block, 0, " "); \ 2919 } while (0) 2920 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 2921 do { \ 2922 no_printk(fmt, ##__VA_ARGS__); \ 2923 __ext4_error_inode(inode, "", 0, block, err, " "); \ 2924 } while (0) 2925 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2926 do { \ 2927 no_printk(fmt, ##__VA_ARGS__); \ 2928 __ext4_error_file(file, "", 0, block, " "); \ 2929 } while (0) 2930 #define ext4_error(sb, fmt, ...) \ 2931 do { \ 2932 no_printk(fmt, ##__VA_ARGS__); \ 2933 __ext4_error(sb, "", 0, 0, 0, " "); \ 2934 } while (0) 2935 #define ext4_error_err(sb, err, fmt, ...) \ 2936 do { \ 2937 no_printk(fmt, ##__VA_ARGS__); \ 2938 __ext4_error(sb, "", 0, err, 0, " "); \ 2939 } while (0) 2940 #define ext4_abort(sb, err, fmt, ...) \ 2941 do { \ 2942 no_printk(fmt, ##__VA_ARGS__); \ 2943 __ext4_abort(sb, "", 0, err, " "); \ 2944 } while (0) 2945 #define ext4_warning(sb, fmt, ...) \ 2946 do { \ 2947 no_printk(fmt, ##__VA_ARGS__); \ 2948 __ext4_warning(sb, "", 0, " "); \ 2949 } while (0) 2950 #define ext4_warning_inode(inode, fmt, ...) \ 2951 do { \ 2952 no_printk(fmt, ##__VA_ARGS__); \ 2953 __ext4_warning_inode(inode, "", 0, " "); \ 2954 } while (0) 2955 #define ext4_msg(sb, level, fmt, ...) \ 2956 do { \ 2957 no_printk(fmt, ##__VA_ARGS__); \ 2958 __ext4_msg(sb, "", " "); \ 2959 } while (0) 2960 #define dump_mmp_msg(sb, mmp, msg) \ 2961 __dump_mmp_msg(sb, mmp, "", 0, "") 2962 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2963 do { \ 2964 no_printk(fmt, ##__VA_ARGS__); \ 2965 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 2966 } while (0) 2967 2968 #endif 2969 2970 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2971 struct ext4_group_desc *bg); 2972 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2973 struct ext4_group_desc *bg); 2974 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2975 struct ext4_group_desc *bg); 2976 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2977 struct ext4_group_desc *bg); 2978 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2979 struct ext4_group_desc *bg); 2980 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2981 struct ext4_group_desc *bg); 2982 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2983 struct ext4_group_desc *bg); 2984 extern void ext4_block_bitmap_set(struct super_block *sb, 2985 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2986 extern void ext4_inode_bitmap_set(struct super_block *sb, 2987 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2988 extern void ext4_inode_table_set(struct super_block *sb, 2989 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2990 extern void ext4_free_group_clusters_set(struct super_block *sb, 2991 struct ext4_group_desc *bg, 2992 __u32 count); 2993 extern void ext4_free_inodes_set(struct super_block *sb, 2994 struct ext4_group_desc *bg, __u32 count); 2995 extern void ext4_used_dirs_set(struct super_block *sb, 2996 struct ext4_group_desc *bg, __u32 count); 2997 extern void ext4_itable_unused_set(struct super_block *sb, 2998 struct ext4_group_desc *bg, __u32 count); 2999 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 3000 struct ext4_group_desc *gdp); 3001 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 3002 struct ext4_group_desc *gdp); 3003 extern int ext4_register_li_request(struct super_block *sb, 3004 ext4_group_t first_not_zeroed); 3005 3006 static inline int ext4_has_metadata_csum(struct super_block *sb) 3007 { 3008 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 3009 !EXT4_SB(sb)->s_chksum_driver); 3010 3011 return ext4_has_feature_metadata_csum(sb) && 3012 (EXT4_SB(sb)->s_chksum_driver != NULL); 3013 } 3014 3015 static inline int ext4_has_group_desc_csum(struct super_block *sb) 3016 { 3017 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb); 3018 } 3019 3020 #define ext4_read_incompat_64bit_val(es, name) \ 3021 (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \ 3022 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \ 3023 le32_to_cpu(es->name##_lo)) 3024 3025 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 3026 { 3027 return ext4_read_incompat_64bit_val(es, s_blocks_count); 3028 } 3029 3030 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 3031 { 3032 return ext4_read_incompat_64bit_val(es, s_r_blocks_count); 3033 } 3034 3035 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 3036 { 3037 return ext4_read_incompat_64bit_val(es, s_free_blocks_count); 3038 } 3039 3040 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 3041 ext4_fsblk_t blk) 3042 { 3043 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 3044 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 3045 } 3046 3047 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 3048 ext4_fsblk_t blk) 3049 { 3050 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 3051 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 3052 } 3053 3054 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 3055 ext4_fsblk_t blk) 3056 { 3057 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 3058 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 3059 } 3060 3061 static inline loff_t ext4_isize(struct super_block *sb, 3062 struct ext4_inode *raw_inode) 3063 { 3064 if (ext4_has_feature_largedir(sb) || 3065 S_ISREG(le16_to_cpu(raw_inode->i_mode))) 3066 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 3067 le32_to_cpu(raw_inode->i_size_lo); 3068 3069 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 3070 } 3071 3072 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 3073 { 3074 raw_inode->i_size_lo = cpu_to_le32(i_size); 3075 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 3076 } 3077 3078 static inline 3079 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 3080 ext4_group_t group) 3081 { 3082 struct ext4_group_info **grp_info; 3083 long indexv, indexh; 3084 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 3085 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 3086 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 3087 grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv); 3088 return grp_info[indexh]; 3089 } 3090 3091 /* 3092 * Reading s_groups_count requires using smp_rmb() afterwards. See 3093 * the locking protocol documented in the comments of ext4_group_add() 3094 * in resize.c 3095 */ 3096 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 3097 { 3098 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 3099 3100 smp_rmb(); 3101 return ngroups; 3102 } 3103 3104 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 3105 ext4_group_t block_group) 3106 { 3107 return block_group >> sbi->s_log_groups_per_flex; 3108 } 3109 3110 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 3111 { 3112 return 1 << sbi->s_log_groups_per_flex; 3113 } 3114 3115 #define ext4_std_error(sb, errno) \ 3116 do { \ 3117 if ((errno)) \ 3118 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 3119 } while (0) 3120 3121 #ifdef CONFIG_SMP 3122 /* Each CPU can accumulate percpu_counter_batch clusters in their local 3123 * counters. So we need to make sure we have free clusters more 3124 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 3125 */ 3126 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 3127 #else 3128 #define EXT4_FREECLUSTERS_WATERMARK 0 3129 #endif 3130 3131 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 3132 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 3133 { 3134 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 3135 !inode_is_locked(inode)); 3136 down_write(&EXT4_I(inode)->i_data_sem); 3137 if (newsize > EXT4_I(inode)->i_disksize) 3138 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize); 3139 up_write(&EXT4_I(inode)->i_data_sem); 3140 } 3141 3142 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 3143 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 3144 { 3145 int changed = 0; 3146 3147 if (newsize > inode->i_size) { 3148 i_size_write(inode, newsize); 3149 changed = 1; 3150 } 3151 if (newsize > EXT4_I(inode)->i_disksize) { 3152 ext4_update_i_disksize(inode, newsize); 3153 changed |= 2; 3154 } 3155 return changed; 3156 } 3157 3158 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 3159 loff_t len); 3160 3161 struct ext4_group_info { 3162 unsigned long bb_state; 3163 #ifdef AGGRESSIVE_CHECK 3164 unsigned long bb_check_counter; 3165 #endif 3166 struct rb_root bb_free_root; 3167 ext4_grpblk_t bb_first_free; /* first free block */ 3168 ext4_grpblk_t bb_free; /* total free blocks */ 3169 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 3170 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 3171 struct list_head bb_prealloc_list; 3172 #ifdef DOUBLE_CHECK 3173 void *bb_bitmap; 3174 #endif 3175 struct rw_semaphore alloc_sem; 3176 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 3177 * regions, index is order. 3178 * bb_counters[3] = 5 means 3179 * 5 free 8-block regions. */ 3180 }; 3181 3182 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 3183 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 3184 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 3185 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 3186 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \ 3187 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT) 3188 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \ 3189 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT) 3190 #define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4 3191 3192 #define EXT4_MB_GRP_NEED_INIT(grp) \ 3193 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 3194 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 3195 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3196 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 3197 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3198 3199 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 3200 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3201 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 3202 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3203 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 3204 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3205 #define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \ 3206 (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state))) 3207 3208 #define EXT4_MAX_CONTENTION 8 3209 #define EXT4_CONTENTION_THRESHOLD 2 3210 3211 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 3212 ext4_group_t group) 3213 { 3214 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 3215 } 3216 3217 /* 3218 * Returns true if the filesystem is busy enough that attempts to 3219 * access the block group locks has run into contention. 3220 */ 3221 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 3222 { 3223 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 3224 } 3225 3226 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 3227 { 3228 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 3229 if (spin_trylock(lock)) 3230 /* 3231 * We're able to grab the lock right away, so drop the 3232 * lock contention counter. 3233 */ 3234 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 3235 else { 3236 /* 3237 * The lock is busy, so bump the contention counter, 3238 * and then wait on the spin lock. 3239 */ 3240 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 3241 EXT4_MAX_CONTENTION); 3242 spin_lock(lock); 3243 } 3244 } 3245 3246 static inline void ext4_unlock_group(struct super_block *sb, 3247 ext4_group_t group) 3248 { 3249 spin_unlock(ext4_group_lock_ptr(sb, group)); 3250 } 3251 3252 /* 3253 * Block validity checking 3254 */ 3255 #define ext4_check_indirect_blockref(inode, bh) \ 3256 ext4_check_blockref(__func__, __LINE__, inode, \ 3257 (__le32 *)(bh)->b_data, \ 3258 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 3259 3260 #define ext4_ind_check_inode(inode) \ 3261 ext4_check_blockref(__func__, __LINE__, inode, \ 3262 EXT4_I(inode)->i_data, \ 3263 EXT4_NDIR_BLOCKS) 3264 3265 /* 3266 * Inodes and files operations 3267 */ 3268 3269 /* dir.c */ 3270 extern const struct file_operations ext4_dir_operations; 3271 3272 #ifdef CONFIG_UNICODE 3273 extern const struct dentry_operations ext4_dentry_ops; 3274 #endif 3275 3276 /* file.c */ 3277 extern const struct inode_operations ext4_file_inode_operations; 3278 extern const struct file_operations ext4_file_operations; 3279 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 3280 3281 /* inline.c */ 3282 extern int ext4_get_max_inline_size(struct inode *inode); 3283 extern int ext4_find_inline_data_nolock(struct inode *inode); 3284 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 3285 unsigned int len); 3286 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 3287 3288 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 3289 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 3290 struct inode *inode, 3291 loff_t pos, unsigned len, 3292 unsigned flags, 3293 struct page **pagep); 3294 extern int ext4_write_inline_data_end(struct inode *inode, 3295 loff_t pos, unsigned len, 3296 unsigned copied, 3297 struct page *page); 3298 extern struct buffer_head * 3299 ext4_journalled_write_inline_data(struct inode *inode, 3300 unsigned len, 3301 struct page *page); 3302 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 3303 struct inode *inode, 3304 loff_t pos, unsigned len, 3305 unsigned flags, 3306 struct page **pagep, 3307 void **fsdata); 3308 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 3309 unsigned len, unsigned copied, 3310 struct page *page); 3311 extern int ext4_try_add_inline_entry(handle_t *handle, 3312 struct ext4_filename *fname, 3313 struct inode *dir, struct inode *inode); 3314 extern int ext4_try_create_inline_dir(handle_t *handle, 3315 struct inode *parent, 3316 struct inode *inode); 3317 extern int ext4_read_inline_dir(struct file *filp, 3318 struct dir_context *ctx, 3319 int *has_inline_data); 3320 extern int ext4_inlinedir_to_tree(struct file *dir_file, 3321 struct inode *dir, ext4_lblk_t block, 3322 struct dx_hash_info *hinfo, 3323 __u32 start_hash, __u32 start_minor_hash, 3324 int *has_inline_data); 3325 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3326 struct ext4_filename *fname, 3327 struct ext4_dir_entry_2 **res_dir, 3328 int *has_inline_data); 3329 extern int ext4_delete_inline_entry(handle_t *handle, 3330 struct inode *dir, 3331 struct ext4_dir_entry_2 *de_del, 3332 struct buffer_head *bh, 3333 int *has_inline_data); 3334 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); 3335 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3336 struct ext4_dir_entry_2 **parent_de, 3337 int *retval); 3338 extern int ext4_inline_data_fiemap(struct inode *inode, 3339 struct fiemap_extent_info *fieinfo, 3340 int *has_inline, __u64 start, __u64 len); 3341 3342 struct iomap; 3343 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap); 3344 3345 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3346 3347 extern int ext4_convert_inline_data(struct inode *inode); 3348 3349 static inline int ext4_has_inline_data(struct inode *inode) 3350 { 3351 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3352 EXT4_I(inode)->i_inline_off; 3353 } 3354 3355 /* namei.c */ 3356 extern const struct inode_operations ext4_dir_inode_operations; 3357 extern const struct inode_operations ext4_special_inode_operations; 3358 extern struct dentry *ext4_get_parent(struct dentry *child); 3359 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3360 struct ext4_dir_entry_2 *de, 3361 int blocksize, int csum_size, 3362 unsigned int parent_ino, int dotdot_real_len); 3363 extern void ext4_initialize_dirent_tail(struct buffer_head *bh, 3364 unsigned int blocksize); 3365 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode, 3366 struct buffer_head *bh); 3367 extern int ext4_ci_compare(const struct inode *parent, 3368 const struct qstr *fname, 3369 const struct qstr *entry, bool quick); 3370 3371 #define S_SHIFT 12 3372 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = { 3373 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3374 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3375 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3376 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3377 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3378 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3379 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3380 }; 3381 3382 static inline void ext4_set_de_type(struct super_block *sb, 3383 struct ext4_dir_entry_2 *de, 3384 umode_t mode) { 3385 if (ext4_has_feature_filetype(sb)) 3386 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3387 } 3388 3389 /* readpages.c */ 3390 extern int ext4_mpage_readpages(struct inode *inode, 3391 struct readahead_control *rac, struct page *page); 3392 extern int __init ext4_init_post_read_processing(void); 3393 extern void ext4_exit_post_read_processing(void); 3394 3395 /* symlink.c */ 3396 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3397 extern const struct inode_operations ext4_symlink_inode_operations; 3398 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3399 3400 /* sysfs.c */ 3401 extern int ext4_register_sysfs(struct super_block *sb); 3402 extern void ext4_unregister_sysfs(struct super_block *sb); 3403 extern int __init ext4_init_sysfs(void); 3404 extern void ext4_exit_sysfs(void); 3405 3406 /* block_validity */ 3407 extern void ext4_release_system_zone(struct super_block *sb); 3408 extern int ext4_setup_system_zone(struct super_block *sb); 3409 extern int __init ext4_init_system_zone(void); 3410 extern void ext4_exit_system_zone(void); 3411 extern int ext4_inode_block_valid(struct inode *inode, 3412 ext4_fsblk_t start_blk, 3413 unsigned int count); 3414 extern int ext4_check_blockref(const char *, unsigned int, 3415 struct inode *, __le32 *, unsigned int); 3416 3417 /* extents.c */ 3418 struct ext4_ext_path; 3419 struct ext4_extent; 3420 3421 /* 3422 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3423 * __le32. 3424 */ 3425 #define EXT_MAX_BLOCKS 0xffffffff 3426 3427 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode); 3428 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3429 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3430 struct ext4_map_blocks *map, int flags); 3431 extern int ext4_ext_truncate(handle_t *, struct inode *); 3432 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3433 ext4_lblk_t end); 3434 extern void ext4_ext_init(struct super_block *); 3435 extern void ext4_ext_release(struct super_block *); 3436 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3437 loff_t len); 3438 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3439 loff_t offset, ssize_t len); 3440 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle, 3441 ext4_io_end_t *io_end); 3442 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3443 struct ext4_map_blocks *map, int flags); 3444 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3445 int num, 3446 struct ext4_ext_path *path); 3447 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3448 struct ext4_ext_path **, 3449 struct ext4_extent *, int); 3450 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3451 struct ext4_ext_path **, 3452 int flags); 3453 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 3454 extern int ext4_ext_check_inode(struct inode *inode); 3455 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3456 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3457 __u64 start, __u64 len); 3458 extern int ext4_get_es_cache(struct inode *inode, 3459 struct fiemap_extent_info *fieinfo, 3460 __u64 start, __u64 len); 3461 extern int ext4_ext_precache(struct inode *inode); 3462 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3463 struct inode *inode2, ext4_lblk_t lblk1, 3464 ext4_lblk_t lblk2, ext4_lblk_t count, 3465 int mark_unwritten,int *err); 3466 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu); 3467 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode, 3468 int check_cred, int restart_cred, 3469 int revoke_cred); 3470 3471 3472 /* move_extent.c */ 3473 extern void ext4_double_down_write_data_sem(struct inode *first, 3474 struct inode *second); 3475 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3476 struct inode *donor_inode); 3477 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3478 __u64 start_orig, __u64 start_donor, 3479 __u64 len, __u64 *moved_len); 3480 3481 /* page-io.c */ 3482 extern int __init ext4_init_pageio(void); 3483 extern void ext4_exit_pageio(void); 3484 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3485 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3486 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3487 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3488 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3489 struct writeback_control *wbc); 3490 extern void ext4_end_io_rsv_work(struct work_struct *work); 3491 extern void ext4_io_submit(struct ext4_io_submit *io); 3492 extern int ext4_bio_write_page(struct ext4_io_submit *io, 3493 struct page *page, 3494 int len, 3495 struct writeback_control *wbc, 3496 bool keep_towrite); 3497 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end); 3498 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end); 3499 3500 /* mmp.c */ 3501 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3502 3503 /* verity.c */ 3504 extern const struct fsverity_operations ext4_verityops; 3505 3506 /* 3507 * Add new method to test whether block and inode bitmaps are properly 3508 * initialized. With uninit_bg reading the block from disk is not enough 3509 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3510 */ 3511 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3512 3513 static inline int bitmap_uptodate(struct buffer_head *bh) 3514 { 3515 return (buffer_uptodate(bh) && 3516 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3517 } 3518 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3519 { 3520 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3521 } 3522 3523 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3524 3525 /* For ioend & aio unwritten conversion wait queues */ 3526 #define EXT4_WQ_HASH_SZ 37 3527 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3528 EXT4_WQ_HASH_SZ]) 3529 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3530 3531 extern int ext4_resize_begin(struct super_block *sb); 3532 extern void ext4_resize_end(struct super_block *sb); 3533 3534 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 3535 struct ext4_io_end *io_end) 3536 { 3537 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 3538 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3539 atomic_inc(&EXT4_I(inode)->i_unwritten); 3540 } 3541 } 3542 3543 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3544 { 3545 struct inode *inode = io_end->inode; 3546 3547 if (io_end->flag & EXT4_IO_END_UNWRITTEN) { 3548 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3549 /* Wake up anyone waiting on unwritten extent conversion */ 3550 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) 3551 wake_up_all(ext4_ioend_wq(inode)); 3552 } 3553 } 3554 3555 extern const struct iomap_ops ext4_iomap_ops; 3556 extern const struct iomap_ops ext4_iomap_overwrite_ops; 3557 extern const struct iomap_ops ext4_iomap_report_ops; 3558 3559 static inline int ext4_buffer_uptodate(struct buffer_head *bh) 3560 { 3561 /* 3562 * If the buffer has the write error flag, we have failed 3563 * to write out data in the block. In this case, we don't 3564 * have to read the block because we may read the old data 3565 * successfully. 3566 */ 3567 if (!buffer_uptodate(bh) && buffer_write_io_error(bh)) 3568 set_buffer_uptodate(bh); 3569 return buffer_uptodate(bh); 3570 } 3571 3572 #endif /* __KERNEL__ */ 3573 3574 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3575 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3576 3577 #endif /* _EXT4_H */ 3578