1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * ext4.h 4 * 5 * Copyright (C) 1992, 1993, 1994, 1995 6 * Remy Card (card@masi.ibp.fr) 7 * Laboratoire MASI - Institut Blaise Pascal 8 * Universite Pierre et Marie Curie (Paris VI) 9 * 10 * from 11 * 12 * linux/include/linux/minix_fs.h 13 * 14 * Copyright (C) 1991, 1992 Linus Torvalds 15 */ 16 17 #ifndef _EXT4_H 18 #define _EXT4_H 19 20 #include <linux/types.h> 21 #include <linux/blkdev.h> 22 #include <linux/magic.h> 23 #include <linux/jbd2.h> 24 #include <linux/quota.h> 25 #include <linux/rwsem.h> 26 #include <linux/rbtree.h> 27 #include <linux/seqlock.h> 28 #include <linux/mutex.h> 29 #include <linux/timer.h> 30 #include <linux/wait.h> 31 #include <linux/sched/signal.h> 32 #include <linux/blockgroup_lock.h> 33 #include <linux/percpu_counter.h> 34 #include <linux/ratelimit.h> 35 #include <crypto/hash.h> 36 #include <linux/falloc.h> 37 #include <linux/percpu-rwsem.h> 38 #include <linux/fiemap.h> 39 #ifdef __KERNEL__ 40 #include <linux/compat.h> 41 #endif 42 43 #include <linux/fscrypt.h> 44 #include <linux/fsverity.h> 45 46 #include <linux/compiler.h> 47 48 /* 49 * The fourth extended filesystem constants/structures 50 */ 51 52 /* 53 * with AGGRESSIVE_CHECK allocator runs consistency checks over 54 * structures. these checks slow things down a lot 55 */ 56 #define AGGRESSIVE_CHECK__ 57 58 /* 59 * with DOUBLE_CHECK defined mballoc creates persistent in-core 60 * bitmaps, maintains and uses them to check for double allocations 61 */ 62 #define DOUBLE_CHECK__ 63 64 /* 65 * Define EXT4FS_DEBUG to produce debug messages 66 */ 67 #undef EXT4FS_DEBUG 68 69 /* 70 * Debug code 71 */ 72 #ifdef EXT4FS_DEBUG 73 #define ext4_debug(f, a...) \ 74 do { \ 75 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 76 __FILE__, __LINE__, __func__); \ 77 printk(KERN_DEBUG f, ## a); \ 78 } while (0) 79 #else 80 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 81 #endif 82 83 /* 84 * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c 85 */ 86 #define EXT_DEBUG__ 87 88 /* 89 * Dynamic printk for controlled extents debugging. 90 */ 91 #ifdef CONFIG_EXT4_DEBUG 92 #define ext_debug(ino, fmt, ...) \ 93 pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt, \ 94 current->comm, task_pid_nr(current), \ 95 ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__, \ 96 __func__, ##__VA_ARGS__) 97 #else 98 #define ext_debug(ino, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 99 #endif 100 101 /* data type for block offset of block group */ 102 typedef int ext4_grpblk_t; 103 104 /* data type for filesystem-wide blocks number */ 105 typedef unsigned long long ext4_fsblk_t; 106 107 /* data type for file logical block number */ 108 typedef __u32 ext4_lblk_t; 109 110 /* data type for block group number */ 111 typedef unsigned int ext4_group_t; 112 113 enum SHIFT_DIRECTION { 114 SHIFT_LEFT = 0, 115 SHIFT_RIGHT, 116 }; 117 118 /* 119 * Flags used in mballoc's allocation_context flags field. 120 * 121 * Also used to show what's going on for debugging purposes when the 122 * flag field is exported via the traceport interface 123 */ 124 125 /* prefer goal again. length */ 126 #define EXT4_MB_HINT_MERGE 0x0001 127 /* blocks already reserved */ 128 #define EXT4_MB_HINT_RESERVED 0x0002 129 /* metadata is being allocated */ 130 #define EXT4_MB_HINT_METADATA 0x0004 131 /* first blocks in the file */ 132 #define EXT4_MB_HINT_FIRST 0x0008 133 /* search for the best chunk */ 134 #define EXT4_MB_HINT_BEST 0x0010 135 /* data is being allocated */ 136 #define EXT4_MB_HINT_DATA 0x0020 137 /* don't preallocate (for tails) */ 138 #define EXT4_MB_HINT_NOPREALLOC 0x0040 139 /* allocate for locality group */ 140 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 141 /* allocate goal blocks or none */ 142 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 143 /* goal is meaningful */ 144 #define EXT4_MB_HINT_TRY_GOAL 0x0200 145 /* blocks already pre-reserved by delayed allocation */ 146 #define EXT4_MB_DELALLOC_RESERVED 0x0400 147 /* We are doing stream allocation */ 148 #define EXT4_MB_STREAM_ALLOC 0x0800 149 /* Use reserved root blocks if needed */ 150 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 151 /* Use blocks from reserved pool */ 152 #define EXT4_MB_USE_RESERVED 0x2000 153 /* Do strict check for free blocks while retrying block allocation */ 154 #define EXT4_MB_STRICT_CHECK 0x4000 155 156 struct ext4_allocation_request { 157 /* target inode for block we're allocating */ 158 struct inode *inode; 159 /* how many blocks we want to allocate */ 160 unsigned int len; 161 /* logical block in target inode */ 162 ext4_lblk_t logical; 163 /* the closest logical allocated block to the left */ 164 ext4_lblk_t lleft; 165 /* the closest logical allocated block to the right */ 166 ext4_lblk_t lright; 167 /* phys. target (a hint) */ 168 ext4_fsblk_t goal; 169 /* phys. block for the closest logical allocated block to the left */ 170 ext4_fsblk_t pleft; 171 /* phys. block for the closest logical allocated block to the right */ 172 ext4_fsblk_t pright; 173 /* flags. see above EXT4_MB_HINT_* */ 174 unsigned int flags; 175 }; 176 177 /* 178 * Logical to physical block mapping, used by ext4_map_blocks() 179 * 180 * This structure is used to pass requests into ext4_map_blocks() as 181 * well as to store the information returned by ext4_map_blocks(). It 182 * takes less room on the stack than a struct buffer_head. 183 */ 184 #define EXT4_MAP_NEW BIT(BH_New) 185 #define EXT4_MAP_MAPPED BIT(BH_Mapped) 186 #define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten) 187 #define EXT4_MAP_BOUNDARY BIT(BH_Boundary) 188 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 189 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 190 191 struct ext4_map_blocks { 192 ext4_fsblk_t m_pblk; 193 ext4_lblk_t m_lblk; 194 unsigned int m_len; 195 unsigned int m_flags; 196 }; 197 198 /* 199 * Block validity checking, system zone rbtree. 200 */ 201 struct ext4_system_blocks { 202 struct rb_root root; 203 struct rcu_head rcu; 204 }; 205 206 /* 207 * Flags for ext4_io_end->flags 208 */ 209 #define EXT4_IO_END_UNWRITTEN 0x0001 210 211 struct ext4_io_end_vec { 212 struct list_head list; /* list of io_end_vec */ 213 loff_t offset; /* offset in the file */ 214 ssize_t size; /* size of the extent */ 215 }; 216 217 /* 218 * For converting unwritten extents on a work queue. 'handle' is used for 219 * buffered writeback. 220 */ 221 typedef struct ext4_io_end { 222 struct list_head list; /* per-file finished IO list */ 223 handle_t *handle; /* handle reserved for extent 224 * conversion */ 225 struct inode *inode; /* file being written to */ 226 struct bio *bio; /* Linked list of completed 227 * bios covering the extent */ 228 unsigned int flag; /* unwritten or not */ 229 atomic_t count; /* reference counter */ 230 struct list_head list_vec; /* list of ext4_io_end_vec */ 231 } ext4_io_end_t; 232 233 struct ext4_io_submit { 234 struct writeback_control *io_wbc; 235 struct bio *io_bio; 236 ext4_io_end_t *io_end; 237 sector_t io_next_block; 238 }; 239 240 /* 241 * Special inodes numbers 242 */ 243 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 244 #define EXT4_ROOT_INO 2 /* Root inode */ 245 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 246 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 247 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 248 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 249 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 250 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 251 252 /* First non-reserved inode for old ext4 filesystems */ 253 #define EXT4_GOOD_OLD_FIRST_INO 11 254 255 /* 256 * Maximal count of links to a file 257 */ 258 #define EXT4_LINK_MAX 65000 259 260 /* 261 * Macro-instructions used to manage several block sizes 262 */ 263 #define EXT4_MIN_BLOCK_SIZE 1024 264 #define EXT4_MAX_BLOCK_SIZE 65536 265 #define EXT4_MIN_BLOCK_LOG_SIZE 10 266 #define EXT4_MAX_BLOCK_LOG_SIZE 16 267 #define EXT4_MAX_CLUSTER_LOG_SIZE 30 268 #ifdef __KERNEL__ 269 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 270 #else 271 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 272 #endif 273 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 274 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 275 EXT4_SB(s)->s_cluster_bits) 276 #ifdef __KERNEL__ 277 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 278 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 279 #else 280 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 281 #endif 282 #ifdef __KERNEL__ 283 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 284 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 285 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 286 #else 287 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 288 EXT4_GOOD_OLD_INODE_SIZE : \ 289 (s)->s_inode_size) 290 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 291 EXT4_GOOD_OLD_FIRST_INO : \ 292 (s)->s_first_ino) 293 #endif 294 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 295 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \ 296 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \ 297 blkbits)) 298 299 /* Translate a block number to a cluster number */ 300 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 301 /* Translate a cluster number to a block number */ 302 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 303 /* Translate # of blks to # of clusters */ 304 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 305 (sbi)->s_cluster_bits) 306 /* Mask out the low bits to get the starting block of the cluster */ 307 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 308 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 309 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 310 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 311 /* Fill in the low bits to get the last block of the cluster */ 312 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \ 313 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1)) 314 /* Get the cluster offset */ 315 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 316 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 317 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 318 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 319 320 /* 321 * Structure of a blocks group descriptor 322 */ 323 struct ext4_group_desc 324 { 325 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 326 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 327 __le32 bg_inode_table_lo; /* Inodes table block */ 328 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 329 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 330 __le16 bg_used_dirs_count_lo; /* Directories count */ 331 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 332 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 333 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 334 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 335 __le16 bg_itable_unused_lo; /* Unused inodes count */ 336 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 337 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 338 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 339 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 340 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 341 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 342 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 343 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 344 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 345 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 346 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 347 __u32 bg_reserved; 348 }; 349 350 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 351 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 352 sizeof(__le16)) 353 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 354 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 355 sizeof(__le16)) 356 357 /* 358 * Structure of a flex block group info 359 */ 360 361 struct flex_groups { 362 atomic64_t free_clusters; 363 atomic_t free_inodes; 364 atomic_t used_dirs; 365 }; 366 367 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 368 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 369 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 370 371 /* 372 * Macro-instructions used to manage group descriptors 373 */ 374 #define EXT4_MIN_DESC_SIZE 32 375 #define EXT4_MIN_DESC_SIZE_64BIT 64 376 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 377 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 378 #ifdef __KERNEL__ 379 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 380 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 381 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 382 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 383 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 384 #else 385 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 386 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 387 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 388 #endif 389 390 /* 391 * Constants relative to the data blocks 392 */ 393 #define EXT4_NDIR_BLOCKS 12 394 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 395 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 396 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 397 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 398 399 /* 400 * Inode flags 401 */ 402 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 403 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 404 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 405 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 406 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 407 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 408 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 409 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 410 /* Reserved for compression usage... */ 411 #define EXT4_DIRTY_FL 0x00000100 412 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 413 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 414 /* nb: was previously EXT2_ECOMPR_FL */ 415 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 416 /* End compression flags --- maybe not all used */ 417 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 418 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 419 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 420 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 421 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 422 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 423 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 424 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 425 #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */ 426 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 427 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */ 428 429 #define EXT4_DAX_FL 0x02000000 /* Inode is DAX */ 430 431 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 432 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 433 #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */ 434 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 435 436 /* User modifiable flags */ 437 #define EXT4_FL_USER_MODIFIABLE (EXT4_SECRM_FL | \ 438 EXT4_UNRM_FL | \ 439 EXT4_COMPR_FL | \ 440 EXT4_SYNC_FL | \ 441 EXT4_IMMUTABLE_FL | \ 442 EXT4_APPEND_FL | \ 443 EXT4_NODUMP_FL | \ 444 EXT4_NOATIME_FL | \ 445 EXT4_JOURNAL_DATA_FL | \ 446 EXT4_NOTAIL_FL | \ 447 EXT4_DIRSYNC_FL | \ 448 EXT4_TOPDIR_FL | \ 449 EXT4_EXTENTS_FL | \ 450 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \ 451 EXT4_DAX_FL | \ 452 EXT4_PROJINHERIT_FL | \ 453 EXT4_CASEFOLD_FL) 454 455 /* User visible flags */ 456 #define EXT4_FL_USER_VISIBLE (EXT4_FL_USER_MODIFIABLE | \ 457 EXT4_DIRTY_FL | \ 458 EXT4_COMPRBLK_FL | \ 459 EXT4_NOCOMPR_FL | \ 460 EXT4_ENCRYPT_FL | \ 461 EXT4_INDEX_FL | \ 462 EXT4_VERITY_FL | \ 463 EXT4_INLINE_DATA_FL) 464 465 /* Flags we can manipulate with through FS_IOC_FSSETXATTR */ 466 #define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \ 467 EXT4_IMMUTABLE_FL | \ 468 EXT4_APPEND_FL | \ 469 EXT4_NODUMP_FL | \ 470 EXT4_NOATIME_FL | \ 471 EXT4_PROJINHERIT_FL | \ 472 EXT4_DAX_FL) 473 474 /* Flags that should be inherited by new inodes from their parent. */ 475 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 476 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 477 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 478 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 479 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\ 480 EXT4_DAX_FL) 481 482 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 483 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\ 484 EXT4_PROJINHERIT_FL)) 485 486 /* Flags that are appropriate for non-directories/regular files. */ 487 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 488 489 /* The only flags that should be swapped */ 490 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL) 491 492 /* Flags which are mutually exclusive to DAX */ 493 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\ 494 EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL) 495 496 /* Mask out flags that are inappropriate for the given type of inode. */ 497 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 498 { 499 if (S_ISDIR(mode)) 500 return flags; 501 else if (S_ISREG(mode)) 502 return flags & EXT4_REG_FLMASK; 503 else 504 return flags & EXT4_OTHER_FLMASK; 505 } 506 507 /* 508 * Inode flags used for atomic set/get 509 */ 510 enum { 511 EXT4_INODE_SECRM = 0, /* Secure deletion */ 512 EXT4_INODE_UNRM = 1, /* Undelete */ 513 EXT4_INODE_COMPR = 2, /* Compress file */ 514 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 515 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 516 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 517 EXT4_INODE_NODUMP = 6, /* do not dump file */ 518 EXT4_INODE_NOATIME = 7, /* do not update atime */ 519 /* Reserved for compression usage... */ 520 EXT4_INODE_DIRTY = 8, 521 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 522 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 523 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 524 /* End compression flags --- maybe not all used */ 525 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 526 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 527 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 528 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 529 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 530 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 531 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 532 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 533 EXT4_INODE_VERITY = 20, /* Verity protected inode */ 534 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 535 /* 22 was formerly EXT4_INODE_EOFBLOCKS */ 536 EXT4_INODE_DAX = 25, /* Inode is DAX */ 537 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 538 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 539 EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */ 540 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 541 }; 542 543 /* 544 * Since it's pretty easy to mix up bit numbers and hex values, we use a 545 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 546 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 547 * any extra space in the compiled kernel image, otherwise, the build will fail. 548 * It's important that these values are the same, since we are using 549 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 550 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 551 * values found in ext2, ext3 and ext4 filesystems, and of course the values 552 * defined in e2fsprogs. 553 * 554 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 555 */ 556 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 557 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 558 559 static inline void ext4_check_flag_values(void) 560 { 561 CHECK_FLAG_VALUE(SECRM); 562 CHECK_FLAG_VALUE(UNRM); 563 CHECK_FLAG_VALUE(COMPR); 564 CHECK_FLAG_VALUE(SYNC); 565 CHECK_FLAG_VALUE(IMMUTABLE); 566 CHECK_FLAG_VALUE(APPEND); 567 CHECK_FLAG_VALUE(NODUMP); 568 CHECK_FLAG_VALUE(NOATIME); 569 CHECK_FLAG_VALUE(DIRTY); 570 CHECK_FLAG_VALUE(COMPRBLK); 571 CHECK_FLAG_VALUE(NOCOMPR); 572 CHECK_FLAG_VALUE(ENCRYPT); 573 CHECK_FLAG_VALUE(INDEX); 574 CHECK_FLAG_VALUE(IMAGIC); 575 CHECK_FLAG_VALUE(JOURNAL_DATA); 576 CHECK_FLAG_VALUE(NOTAIL); 577 CHECK_FLAG_VALUE(DIRSYNC); 578 CHECK_FLAG_VALUE(TOPDIR); 579 CHECK_FLAG_VALUE(HUGE_FILE); 580 CHECK_FLAG_VALUE(EXTENTS); 581 CHECK_FLAG_VALUE(VERITY); 582 CHECK_FLAG_VALUE(EA_INODE); 583 CHECK_FLAG_VALUE(INLINE_DATA); 584 CHECK_FLAG_VALUE(PROJINHERIT); 585 CHECK_FLAG_VALUE(CASEFOLD); 586 CHECK_FLAG_VALUE(RESERVED); 587 } 588 589 /* Used to pass group descriptor data when online resize is done */ 590 struct ext4_new_group_input { 591 __u32 group; /* Group number for this data */ 592 __u64 block_bitmap; /* Absolute block number of block bitmap */ 593 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 594 __u64 inode_table; /* Absolute block number of inode table start */ 595 __u32 blocks_count; /* Total number of blocks in this group */ 596 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 597 __u16 unused; 598 }; 599 600 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 601 struct compat_ext4_new_group_input { 602 u32 group; 603 compat_u64 block_bitmap; 604 compat_u64 inode_bitmap; 605 compat_u64 inode_table; 606 u32 blocks_count; 607 u16 reserved_blocks; 608 u16 unused; 609 }; 610 #endif 611 612 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 613 struct ext4_new_group_data { 614 __u32 group; 615 __u64 block_bitmap; 616 __u64 inode_bitmap; 617 __u64 inode_table; 618 __u32 blocks_count; 619 __u16 reserved_blocks; 620 __u16 mdata_blocks; 621 __u32 free_clusters_count; 622 }; 623 624 /* Indexes used to index group tables in ext4_new_group_data */ 625 enum { 626 BLOCK_BITMAP = 0, /* block bitmap */ 627 INODE_BITMAP, /* inode bitmap */ 628 INODE_TABLE, /* inode tables */ 629 GROUP_TABLE_COUNT, 630 }; 631 632 /* 633 * Flags used by ext4_map_blocks() 634 */ 635 /* Allocate any needed blocks and/or convert an unwritten 636 extent to be an initialized ext4 */ 637 #define EXT4_GET_BLOCKS_CREATE 0x0001 638 /* Request the creation of an unwritten extent */ 639 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 640 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 641 EXT4_GET_BLOCKS_CREATE) 642 /* Caller is from the delayed allocation writeout path 643 * finally doing the actual allocation of delayed blocks */ 644 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 645 /* caller is from the direct IO path, request to creation of an 646 unwritten extents if not allocated, split the unwritten 647 extent if blocks has been preallocated already*/ 648 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 649 #define EXT4_GET_BLOCKS_CONVERT 0x0010 650 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 651 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 652 /* Convert extent to initialized after IO complete */ 653 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 654 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 655 /* Eventual metadata allocation (due to growing extent tree) 656 * should not fail, so try to use reserved blocks for that.*/ 657 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 658 /* Don't normalize allocation size (used for fallocate) */ 659 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 660 /* Convert written extents to unwritten */ 661 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 662 /* Write zeros to newly created written extents */ 663 #define EXT4_GET_BLOCKS_ZERO 0x0200 664 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 665 EXT4_GET_BLOCKS_ZERO) 666 /* Caller will submit data before dropping transaction handle. This 667 * allows jbd2 to avoid submitting data before commit. */ 668 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 669 670 /* 671 * The bit position of these flags must not overlap with any of the 672 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 673 * read_extent_tree_block(), ext4_split_extent_at(), 674 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 675 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 676 * caching the extents when reading from the extent tree while a 677 * truncate or punch hole operation is in progress. 678 */ 679 #define EXT4_EX_NOCACHE 0x40000000 680 #define EXT4_EX_FORCE_CACHE 0x20000000 681 #define EXT4_EX_NOFAIL 0x10000000 682 683 /* 684 * Flags used by ext4_free_blocks 685 */ 686 #define EXT4_FREE_BLOCKS_METADATA 0x0001 687 #define EXT4_FREE_BLOCKS_FORGET 0x0002 688 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 689 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 690 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 691 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 692 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040 693 694 /* 695 * ioctl commands 696 */ 697 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 698 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 699 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 700 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 701 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 702 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 703 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 704 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 705 #define EXT4_IOC_MIGRATE _IO('f', 9) 706 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 707 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 708 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 709 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 710 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 711 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 712 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 713 /* ioctl codes 19--39 are reserved for fscrypt */ 714 #define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40) 715 #define EXT4_IOC_GETSTATE _IOW('f', 41, __u32) 716 #define EXT4_IOC_GET_ES_CACHE _IOWR('f', 42, struct fiemap) 717 718 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32) 719 720 /* 721 * Flags for going down operation 722 */ 723 #define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */ 724 #define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */ 725 #define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */ 726 727 /* 728 * Flags returned by EXT4_IOC_GETSTATE 729 * 730 * We only expose to userspace a subset of the state flags in 731 * i_state_flags 732 */ 733 #define EXT4_STATE_FLAG_EXT_PRECACHED 0x00000001 734 #define EXT4_STATE_FLAG_NEW 0x00000002 735 #define EXT4_STATE_FLAG_NEWENTRY 0x00000004 736 #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE 0x00000008 737 738 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 739 /* 740 * ioctl commands in 32 bit emulation 741 */ 742 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 743 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 744 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 745 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 746 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 747 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 748 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 749 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 750 #endif 751 752 /* 753 * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag. 754 * It indicates that the entry in extent status cache is for a hole. 755 */ 756 #define EXT4_FIEMAP_EXTENT_HOLE 0x08000000 757 758 /* Max physical block we can address w/o extents */ 759 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 760 761 /* Max logical block we can support */ 762 #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE 763 764 /* 765 * Structure of an inode on the disk 766 */ 767 struct ext4_inode { 768 __le16 i_mode; /* File mode */ 769 __le16 i_uid; /* Low 16 bits of Owner Uid */ 770 __le32 i_size_lo; /* Size in bytes */ 771 __le32 i_atime; /* Access time */ 772 __le32 i_ctime; /* Inode Change time */ 773 __le32 i_mtime; /* Modification time */ 774 __le32 i_dtime; /* Deletion Time */ 775 __le16 i_gid; /* Low 16 bits of Group Id */ 776 __le16 i_links_count; /* Links count */ 777 __le32 i_blocks_lo; /* Blocks count */ 778 __le32 i_flags; /* File flags */ 779 union { 780 struct { 781 __le32 l_i_version; 782 } linux1; 783 struct { 784 __u32 h_i_translator; 785 } hurd1; 786 struct { 787 __u32 m_i_reserved1; 788 } masix1; 789 } osd1; /* OS dependent 1 */ 790 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 791 __le32 i_generation; /* File version (for NFS) */ 792 __le32 i_file_acl_lo; /* File ACL */ 793 __le32 i_size_high; 794 __le32 i_obso_faddr; /* Obsoleted fragment address */ 795 union { 796 struct { 797 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 798 __le16 l_i_file_acl_high; 799 __le16 l_i_uid_high; /* these 2 fields */ 800 __le16 l_i_gid_high; /* were reserved2[0] */ 801 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 802 __le16 l_i_reserved; 803 } linux2; 804 struct { 805 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 806 __u16 h_i_mode_high; 807 __u16 h_i_uid_high; 808 __u16 h_i_gid_high; 809 __u32 h_i_author; 810 } hurd2; 811 struct { 812 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 813 __le16 m_i_file_acl_high; 814 __u32 m_i_reserved2[2]; 815 } masix2; 816 } osd2; /* OS dependent 2 */ 817 __le16 i_extra_isize; 818 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 819 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 820 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 821 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 822 __le32 i_crtime; /* File Creation time */ 823 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 824 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 825 __le32 i_projid; /* Project ID */ 826 }; 827 828 struct move_extent { 829 __u32 reserved; /* should be zero */ 830 __u32 donor_fd; /* donor file descriptor */ 831 __u64 orig_start; /* logical start offset in block for orig */ 832 __u64 donor_start; /* logical start offset in block for donor */ 833 __u64 len; /* block length to be moved */ 834 __u64 moved_len; /* moved block length */ 835 }; 836 837 #define EXT4_EPOCH_BITS 2 838 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 839 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 840 841 /* 842 * Extended fields will fit into an inode if the filesystem was formatted 843 * with large inodes (-I 256 or larger) and there are not currently any EAs 844 * consuming all of the available space. For new inodes we always reserve 845 * enough space for the kernel's known extended fields, but for inodes 846 * created with an old kernel this might not have been the case. None of 847 * the extended inode fields is critical for correct filesystem operation. 848 * This macro checks if a certain field fits in the inode. Note that 849 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 850 */ 851 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 852 ((offsetof(typeof(*ext4_inode), field) + \ 853 sizeof((ext4_inode)->field)) \ 854 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 855 (einode)->i_extra_isize)) \ 856 857 /* 858 * We use an encoding that preserves the times for extra epoch "00": 859 * 860 * extra msb of adjust for signed 861 * epoch 32-bit 32-bit tv_sec to 862 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 863 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 864 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 865 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 866 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 867 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 868 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 869 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 870 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 871 * 872 * Note that previous versions of the kernel on 64-bit systems would 873 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 874 * 1970. e2fsck will correct this, assuming that it is run on the 875 * affected filesystem before 2242. 876 */ 877 878 static inline __le32 ext4_encode_extra_time(struct timespec64 *time) 879 { 880 u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK; 881 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); 882 } 883 884 static inline void ext4_decode_extra_time(struct timespec64 *time, 885 __le32 extra) 886 { 887 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) 888 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 889 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 890 } 891 892 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 893 do { \ 894 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\ 895 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 896 (raw_inode)->xtime ## _extra = \ 897 ext4_encode_extra_time(&(inode)->xtime); \ 898 } \ 899 else \ 900 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX)); \ 901 } while (0) 902 903 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 904 do { \ 905 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 906 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 907 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 908 (raw_inode)->xtime ## _extra = \ 909 ext4_encode_extra_time(&(einode)->xtime); \ 910 } while (0) 911 912 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 913 do { \ 914 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 915 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \ 916 ext4_decode_extra_time(&(inode)->xtime, \ 917 raw_inode->xtime ## _extra); \ 918 } \ 919 else \ 920 (inode)->xtime.tv_nsec = 0; \ 921 } while (0) 922 923 924 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 925 do { \ 926 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 927 (einode)->xtime.tv_sec = \ 928 (signed)le32_to_cpu((raw_inode)->xtime); \ 929 else \ 930 (einode)->xtime.tv_sec = 0; \ 931 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 932 ext4_decode_extra_time(&(einode)->xtime, \ 933 raw_inode->xtime ## _extra); \ 934 else \ 935 (einode)->xtime.tv_nsec = 0; \ 936 } while (0) 937 938 #define i_disk_version osd1.linux1.l_i_version 939 940 #if defined(__KERNEL__) || defined(__linux__) 941 #define i_reserved1 osd1.linux1.l_i_reserved1 942 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 943 #define i_blocks_high osd2.linux2.l_i_blocks_high 944 #define i_uid_low i_uid 945 #define i_gid_low i_gid 946 #define i_uid_high osd2.linux2.l_i_uid_high 947 #define i_gid_high osd2.linux2.l_i_gid_high 948 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 949 950 #elif defined(__GNU__) 951 952 #define i_translator osd1.hurd1.h_i_translator 953 #define i_uid_high osd2.hurd2.h_i_uid_high 954 #define i_gid_high osd2.hurd2.h_i_gid_high 955 #define i_author osd2.hurd2.h_i_author 956 957 #elif defined(__masix__) 958 959 #define i_reserved1 osd1.masix1.m_i_reserved1 960 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 961 #define i_reserved2 osd2.masix2.m_i_reserved2 962 963 #endif /* defined(__KERNEL__) || defined(__linux__) */ 964 965 #include "extents_status.h" 966 #include "fast_commit.h" 967 968 /* 969 * Lock subclasses for i_data_sem in the ext4_inode_info structure. 970 * 971 * These are needed to avoid lockdep false positives when we need to 972 * allocate blocks to the quota inode during ext4_map_blocks(), while 973 * holding i_data_sem for a normal (non-quota) inode. Since we don't 974 * do quota tracking for the quota inode, this avoids deadlock (as 975 * well as infinite recursion, since it isn't turtles all the way 976 * down...) 977 * 978 * I_DATA_SEM_NORMAL - Used for most inodes 979 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode 980 * where the second inode has larger inode number 981 * than the first 982 * I_DATA_SEM_QUOTA - Used for quota inodes only 983 */ 984 enum { 985 I_DATA_SEM_NORMAL = 0, 986 I_DATA_SEM_OTHER, 987 I_DATA_SEM_QUOTA, 988 }; 989 990 991 /* 992 * fourth extended file system inode data in memory 993 */ 994 struct ext4_inode_info { 995 __le32 i_data[15]; /* unconverted */ 996 __u32 i_dtime; 997 ext4_fsblk_t i_file_acl; 998 999 /* 1000 * i_block_group is the number of the block group which contains 1001 * this file's inode. Constant across the lifetime of the inode, 1002 * it is used for making block allocation decisions - we try to 1003 * place a file's data blocks near its inode block, and new inodes 1004 * near to their parent directory's inode. 1005 */ 1006 ext4_group_t i_block_group; 1007 ext4_lblk_t i_dir_start_lookup; 1008 #if (BITS_PER_LONG < 64) 1009 unsigned long i_state_flags; /* Dynamic state flags */ 1010 #endif 1011 unsigned long i_flags; 1012 1013 /* 1014 * Extended attributes can be read independently of the main file 1015 * data. Taking i_mutex even when reading would cause contention 1016 * between readers of EAs and writers of regular file data, so 1017 * instead we synchronize on xattr_sem when reading or changing 1018 * EAs. 1019 */ 1020 struct rw_semaphore xattr_sem; 1021 1022 struct list_head i_orphan; /* unlinked but open inodes */ 1023 1024 /* Fast commit related info */ 1025 1026 struct list_head i_fc_list; /* 1027 * inodes that need fast commit 1028 * protected by sbi->s_fc_lock. 1029 */ 1030 1031 /* Start of lblk range that needs to be committed in this fast commit */ 1032 ext4_lblk_t i_fc_lblk_start; 1033 1034 /* End of lblk range that needs to be committed in this fast commit */ 1035 ext4_lblk_t i_fc_lblk_len; 1036 1037 /* Number of ongoing updates on this inode */ 1038 atomic_t i_fc_updates; 1039 1040 /* Fast commit wait queue for this inode */ 1041 wait_queue_head_t i_fc_wait; 1042 1043 /* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */ 1044 struct mutex i_fc_lock; 1045 1046 /* 1047 * i_disksize keeps track of what the inode size is ON DISK, not 1048 * in memory. During truncate, i_size is set to the new size by 1049 * the VFS prior to calling ext4_truncate(), but the filesystem won't 1050 * set i_disksize to 0 until the truncate is actually under way. 1051 * 1052 * The intent is that i_disksize always represents the blocks which 1053 * are used by this file. This allows recovery to restart truncate 1054 * on orphans if we crash during truncate. We actually write i_disksize 1055 * into the on-disk inode when writing inodes out, instead of i_size. 1056 * 1057 * The only time when i_disksize and i_size may be different is when 1058 * a truncate is in progress. The only things which change i_disksize 1059 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 1060 */ 1061 loff_t i_disksize; 1062 1063 /* 1064 * i_data_sem is for serialising ext4_truncate() against 1065 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 1066 * data tree are chopped off during truncate. We can't do that in 1067 * ext4 because whenever we perform intermediate commits during 1068 * truncate, the inode and all the metadata blocks *must* be in a 1069 * consistent state which allows truncation of the orphans to restart 1070 * during recovery. Hence we must fix the get_block-vs-truncate race 1071 * by other means, so we have i_data_sem. 1072 */ 1073 struct rw_semaphore i_data_sem; 1074 /* 1075 * i_mmap_sem is for serializing page faults with truncate / punch hole 1076 * operations. We have to make sure that new page cannot be faulted in 1077 * a section of the inode that is being punched. We cannot easily use 1078 * i_data_sem for this since we need protection for the whole punch 1079 * operation and i_data_sem ranks below transaction start so we have 1080 * to occasionally drop it. 1081 */ 1082 struct rw_semaphore i_mmap_sem; 1083 struct inode vfs_inode; 1084 struct jbd2_inode *jinode; 1085 1086 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 1087 1088 /* 1089 * File creation time. Its function is same as that of 1090 * struct timespec64 i_{a,c,m}time in the generic inode. 1091 */ 1092 struct timespec64 i_crtime; 1093 1094 /* mballoc */ 1095 atomic_t i_prealloc_active; 1096 struct list_head i_prealloc_list; 1097 spinlock_t i_prealloc_lock; 1098 1099 /* extents status tree */ 1100 struct ext4_es_tree i_es_tree; 1101 rwlock_t i_es_lock; 1102 struct list_head i_es_list; 1103 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1104 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1105 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1106 extents to shrink. Protected by 1107 i_es_lock */ 1108 1109 /* ialloc */ 1110 ext4_group_t i_last_alloc_group; 1111 1112 /* allocation reservation info for delalloc */ 1113 /* In case of bigalloc, this refer to clusters rather than blocks */ 1114 unsigned int i_reserved_data_blocks; 1115 1116 /* pending cluster reservations for bigalloc file systems */ 1117 struct ext4_pending_tree i_pending_tree; 1118 1119 /* on-disk additional length */ 1120 __u16 i_extra_isize; 1121 1122 /* Indicate the inline data space. */ 1123 u16 i_inline_off; 1124 u16 i_inline_size; 1125 1126 #ifdef CONFIG_QUOTA 1127 /* quota space reservation, managed internally by quota code */ 1128 qsize_t i_reserved_quota; 1129 #endif 1130 1131 /* Lock protecting lists below */ 1132 spinlock_t i_completed_io_lock; 1133 /* 1134 * Completed IOs that need unwritten extents handling and have 1135 * transaction reserved 1136 */ 1137 struct list_head i_rsv_conversion_list; 1138 struct work_struct i_rsv_conversion_work; 1139 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 1140 1141 spinlock_t i_block_reservation_lock; 1142 1143 /* 1144 * Transactions that contain inode's metadata needed to complete 1145 * fsync and fdatasync, respectively. 1146 */ 1147 tid_t i_sync_tid; 1148 tid_t i_datasync_tid; 1149 1150 #ifdef CONFIG_QUOTA 1151 struct dquot *i_dquot[MAXQUOTAS]; 1152 #endif 1153 1154 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1155 __u32 i_csum_seed; 1156 1157 kprojid_t i_projid; 1158 }; 1159 1160 /* 1161 * File system states 1162 */ 1163 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1164 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1165 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1166 #define EXT4_FC_REPLAY 0x0020 /* Fast commit replay ongoing */ 1167 1168 /* 1169 * Misc. filesystem flags 1170 */ 1171 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1172 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1173 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1174 1175 /* 1176 * Mount flags set via mount options or defaults 1177 */ 1178 #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */ 1179 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1180 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1181 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1182 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1183 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1184 #define EXT4_MOUNT_ERRORS_MASK 0x00070 1185 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1186 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1187 #ifdef CONFIG_FS_DAX 1188 #define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */ 1189 #else 1190 #define EXT4_MOUNT_DAX_ALWAYS 0 1191 #endif 1192 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1193 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1194 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1195 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1196 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1197 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1198 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1199 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1200 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1201 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1202 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */ 1203 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota, 1204 * enable enforcement for hidden 1205 * quota files */ 1206 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable 1207 * enforcement for hidden quota 1208 * files */ 1209 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota 1210 * enforcement */ 1211 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1212 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1213 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1214 #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */ 1215 #define EXT4_MOUNT_PREFETCH_BLOCK_BITMAPS 0x4000000 1216 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1217 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1218 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1219 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1220 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1221 1222 /* 1223 * Mount flags set either automatically (could not be set by mount option) 1224 * based on per file system feature or property or in special cases such as 1225 * distinguishing between explicit mount option definition and default. 1226 */ 1227 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1228 specified delalloc */ 1229 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1230 size of blocksize * 8 1231 blocks */ 1232 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1233 file systems */ 1234 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1235 specified journal checksum */ 1236 1237 #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */ 1238 #define EXT4_MOUNT2_DAX_NEVER 0x00000020 /* Do not allow Direct Access */ 1239 #define EXT4_MOUNT2_DAX_INODE 0x00000040 /* For printing options only */ 1240 1241 1242 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1243 ~EXT4_MOUNT_##opt 1244 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1245 EXT4_MOUNT_##opt 1246 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1247 EXT4_MOUNT_##opt) 1248 1249 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1250 ~EXT4_MOUNT2_##opt 1251 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1252 EXT4_MOUNT2_##opt 1253 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1254 EXT4_MOUNT2_##opt) 1255 1256 #define ext4_test_and_set_bit __test_and_set_bit_le 1257 #define ext4_set_bit __set_bit_le 1258 #define ext4_set_bit_atomic ext2_set_bit_atomic 1259 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1260 #define ext4_clear_bit __clear_bit_le 1261 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1262 #define ext4_test_bit test_bit_le 1263 #define ext4_find_next_zero_bit find_next_zero_bit_le 1264 #define ext4_find_next_bit find_next_bit_le 1265 1266 extern void ext4_set_bits(void *bm, int cur, int len); 1267 1268 /* 1269 * Maximal mount counts between two filesystem checks 1270 */ 1271 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1272 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1273 1274 /* 1275 * Behaviour when detecting errors 1276 */ 1277 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1278 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1279 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1280 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1281 1282 /* Metadata checksum algorithm codes */ 1283 #define EXT4_CRC32C_CHKSUM 1 1284 1285 /* 1286 * Structure of the super block 1287 */ 1288 struct ext4_super_block { 1289 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1290 __le32 s_blocks_count_lo; /* Blocks count */ 1291 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1292 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1293 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1294 __le32 s_first_data_block; /* First Data Block */ 1295 __le32 s_log_block_size; /* Block size */ 1296 __le32 s_log_cluster_size; /* Allocation cluster size */ 1297 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1298 __le32 s_clusters_per_group; /* # Clusters per group */ 1299 __le32 s_inodes_per_group; /* # Inodes per group */ 1300 __le32 s_mtime; /* Mount time */ 1301 /*30*/ __le32 s_wtime; /* Write time */ 1302 __le16 s_mnt_count; /* Mount count */ 1303 __le16 s_max_mnt_count; /* Maximal mount count */ 1304 __le16 s_magic; /* Magic signature */ 1305 __le16 s_state; /* File system state */ 1306 __le16 s_errors; /* Behaviour when detecting errors */ 1307 __le16 s_minor_rev_level; /* minor revision level */ 1308 /*40*/ __le32 s_lastcheck; /* time of last check */ 1309 __le32 s_checkinterval; /* max. time between checks */ 1310 __le32 s_creator_os; /* OS */ 1311 __le32 s_rev_level; /* Revision level */ 1312 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1313 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1314 /* 1315 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1316 * 1317 * Note: the difference between the compatible feature set and 1318 * the incompatible feature set is that if there is a bit set 1319 * in the incompatible feature set that the kernel doesn't 1320 * know about, it should refuse to mount the filesystem. 1321 * 1322 * e2fsck's requirements are more strict; if it doesn't know 1323 * about a feature in either the compatible or incompatible 1324 * feature set, it must abort and not try to meddle with 1325 * things it doesn't understand... 1326 */ 1327 __le32 s_first_ino; /* First non-reserved inode */ 1328 __le16 s_inode_size; /* size of inode structure */ 1329 __le16 s_block_group_nr; /* block group # of this superblock */ 1330 __le32 s_feature_compat; /* compatible feature set */ 1331 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1332 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1333 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1334 /*78*/ char s_volume_name[16]; /* volume name */ 1335 /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */ 1336 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1337 /* 1338 * Performance hints. Directory preallocation should only 1339 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1340 */ 1341 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1342 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1343 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1344 /* 1345 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1346 */ 1347 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1348 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1349 __le32 s_journal_dev; /* device number of journal file */ 1350 __le32 s_last_orphan; /* start of list of inodes to delete */ 1351 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1352 __u8 s_def_hash_version; /* Default hash version to use */ 1353 __u8 s_jnl_backup_type; 1354 __le16 s_desc_size; /* size of group descriptor */ 1355 /*100*/ __le32 s_default_mount_opts; 1356 __le32 s_first_meta_bg; /* First metablock block group */ 1357 __le32 s_mkfs_time; /* When the filesystem was created */ 1358 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1359 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1360 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1361 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1362 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1363 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1364 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1365 __le32 s_flags; /* Miscellaneous flags */ 1366 __le16 s_raid_stride; /* RAID stride */ 1367 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1368 __le64 s_mmp_block; /* Block for multi-mount protection */ 1369 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1370 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1371 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1372 __u8 s_encryption_level; /* versioning level for encryption */ 1373 __u8 s_reserved_pad; /* Padding to next 32bits */ 1374 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1375 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1376 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1377 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1378 snapshot's future use */ 1379 __le32 s_snapshot_list; /* inode number of the head of the 1380 on-disk snapshot list */ 1381 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1382 __le32 s_error_count; /* number of fs errors */ 1383 __le32 s_first_error_time; /* first time an error happened */ 1384 __le32 s_first_error_ino; /* inode involved in first error */ 1385 __le64 s_first_error_block; /* block involved of first error */ 1386 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */ 1387 __le32 s_first_error_line; /* line number where error happened */ 1388 __le32 s_last_error_time; /* most recent time of an error */ 1389 __le32 s_last_error_ino; /* inode involved in last error */ 1390 __le32 s_last_error_line; /* line number where error happened */ 1391 __le64 s_last_error_block; /* block involved of last error */ 1392 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */ 1393 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1394 __u8 s_mount_opts[64]; 1395 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1396 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1397 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1398 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1399 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1400 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1401 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1402 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1403 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1404 __u8 s_wtime_hi; 1405 __u8 s_mtime_hi; 1406 __u8 s_mkfs_time_hi; 1407 __u8 s_lastcheck_hi; 1408 __u8 s_first_error_time_hi; 1409 __u8 s_last_error_time_hi; 1410 __u8 s_first_error_errcode; 1411 __u8 s_last_error_errcode; 1412 __le16 s_encoding; /* Filename charset encoding */ 1413 __le16 s_encoding_flags; /* Filename charset encoding flags */ 1414 __le32 s_reserved[95]; /* Padding to the end of the block */ 1415 __le32 s_checksum; /* crc32c(superblock) */ 1416 }; 1417 1418 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1419 1420 #ifdef __KERNEL__ 1421 1422 #ifdef CONFIG_FS_ENCRYPTION 1423 #define DUMMY_ENCRYPTION_ENABLED(sbi) ((sbi)->s_dummy_enc_policy.policy != NULL) 1424 #else 1425 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0) 1426 #endif 1427 1428 /* Number of quota types we support */ 1429 #define EXT4_MAXQUOTAS 3 1430 1431 #define EXT4_ENC_UTF8_12_1 1 1432 1433 /* 1434 * fourth extended-fs super-block data in memory 1435 */ 1436 struct ext4_sb_info { 1437 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1438 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1439 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1440 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1441 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1442 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1443 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1444 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1445 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1446 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1447 unsigned long s_overhead; /* # of fs overhead clusters */ 1448 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1449 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1450 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1451 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1452 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1453 struct buffer_head * __rcu *s_group_desc; 1454 unsigned int s_mount_opt; 1455 unsigned int s_mount_opt2; 1456 unsigned long s_mount_flags; 1457 unsigned int s_def_mount_opt; 1458 ext4_fsblk_t s_sb_block; 1459 atomic64_t s_resv_clusters; 1460 kuid_t s_resuid; 1461 kgid_t s_resgid; 1462 unsigned short s_mount_state; 1463 unsigned short s_pad; 1464 int s_addr_per_block_bits; 1465 int s_desc_per_block_bits; 1466 int s_inode_size; 1467 int s_first_ino; 1468 unsigned int s_inode_readahead_blks; 1469 unsigned int s_inode_goal; 1470 u32 s_hash_seed[4]; 1471 int s_def_hash_version; 1472 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1473 struct percpu_counter s_freeclusters_counter; 1474 struct percpu_counter s_freeinodes_counter; 1475 struct percpu_counter s_dirs_counter; 1476 struct percpu_counter s_dirtyclusters_counter; 1477 struct blockgroup_lock *s_blockgroup_lock; 1478 struct proc_dir_entry *s_proc; 1479 struct kobject s_kobj; 1480 struct completion s_kobj_unregister; 1481 struct super_block *s_sb; 1482 1483 /* Journaling */ 1484 struct journal_s *s_journal; 1485 struct list_head s_orphan; 1486 struct mutex s_orphan_lock; 1487 unsigned long s_ext4_flags; /* Ext4 superblock flags */ 1488 unsigned long s_commit_interval; 1489 u32 s_max_batch_time; 1490 u32 s_min_batch_time; 1491 struct block_device *s_journal_bdev; 1492 #ifdef CONFIG_QUOTA 1493 /* Names of quota files with journalled quota */ 1494 char __rcu *s_qf_names[EXT4_MAXQUOTAS]; 1495 int s_jquota_fmt; /* Format of quota to use */ 1496 #endif 1497 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1498 struct ext4_system_blocks __rcu *s_system_blks; 1499 1500 #ifdef EXTENTS_STATS 1501 /* ext4 extents stats */ 1502 unsigned long s_ext_min; 1503 unsigned long s_ext_max; 1504 unsigned long s_depth_max; 1505 spinlock_t s_ext_stats_lock; 1506 unsigned long s_ext_blocks; 1507 unsigned long s_ext_extents; 1508 #endif 1509 1510 /* for buddy allocator */ 1511 struct ext4_group_info ** __rcu *s_group_info; 1512 struct inode *s_buddy_cache; 1513 spinlock_t s_md_lock; 1514 unsigned short *s_mb_offsets; 1515 unsigned int *s_mb_maxs; 1516 unsigned int s_group_info_size; 1517 unsigned int s_mb_free_pending; 1518 struct list_head s_freed_data_list; /* List of blocks to be freed 1519 after commit completed */ 1520 1521 /* tunables */ 1522 unsigned long s_stripe; 1523 unsigned int s_mb_stream_request; 1524 unsigned int s_mb_max_to_scan; 1525 unsigned int s_mb_min_to_scan; 1526 unsigned int s_mb_stats; 1527 unsigned int s_mb_order2_reqs; 1528 unsigned int s_mb_group_prealloc; 1529 unsigned int s_mb_max_inode_prealloc; 1530 unsigned int s_max_dir_size_kb; 1531 /* where last allocation was done - for stream allocation */ 1532 unsigned long s_mb_last_group; 1533 unsigned long s_mb_last_start; 1534 unsigned int s_mb_prefetch; 1535 unsigned int s_mb_prefetch_limit; 1536 1537 /* stats for buddy allocator */ 1538 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1539 atomic_t s_bal_success; /* we found long enough chunks */ 1540 atomic_t s_bal_allocated; /* in blocks */ 1541 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1542 atomic_t s_bal_goals; /* goal hits */ 1543 atomic_t s_bal_breaks; /* too long searches */ 1544 atomic_t s_bal_2orders; /* 2^order hits */ 1545 spinlock_t s_bal_lock; 1546 unsigned long s_mb_buddies_generated; 1547 unsigned long long s_mb_generation_time; 1548 atomic_t s_mb_lost_chunks; 1549 atomic_t s_mb_preallocated; 1550 atomic_t s_mb_discarded; 1551 atomic_t s_lock_busy; 1552 1553 /* locality groups */ 1554 struct ext4_locality_group __percpu *s_locality_groups; 1555 1556 /* for write statistics */ 1557 unsigned long s_sectors_written_start; 1558 u64 s_kbytes_written; 1559 1560 /* the size of zero-out chunk */ 1561 unsigned int s_extent_max_zeroout_kb; 1562 1563 unsigned int s_log_groups_per_flex; 1564 struct flex_groups * __rcu *s_flex_groups; 1565 ext4_group_t s_flex_groups_allocated; 1566 1567 /* workqueue for reserved extent conversions (buffered io) */ 1568 struct workqueue_struct *rsv_conversion_wq; 1569 1570 /* timer for periodic error stats printing */ 1571 struct timer_list s_err_report; 1572 1573 /* Lazy inode table initialization info */ 1574 struct ext4_li_request *s_li_request; 1575 /* Wait multiplier for lazy initialization thread */ 1576 unsigned int s_li_wait_mult; 1577 1578 /* Kernel thread for multiple mount protection */ 1579 struct task_struct *s_mmp_tsk; 1580 1581 /* record the last minlen when FITRIM is called. */ 1582 atomic_t s_last_trim_minblks; 1583 1584 /* Reference to checksum algorithm driver via cryptoapi */ 1585 struct crypto_shash *s_chksum_driver; 1586 1587 /* Precomputed FS UUID checksum for seeding other checksums */ 1588 __u32 s_csum_seed; 1589 1590 /* Reclaim extents from extent status tree */ 1591 struct shrinker s_es_shrinker; 1592 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1593 long s_es_nr_inode; 1594 struct ext4_es_stats s_es_stats; 1595 struct mb_cache *s_ea_block_cache; 1596 struct mb_cache *s_ea_inode_cache; 1597 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1598 1599 /* Ratelimit ext4 messages. */ 1600 struct ratelimit_state s_err_ratelimit_state; 1601 struct ratelimit_state s_warning_ratelimit_state; 1602 struct ratelimit_state s_msg_ratelimit_state; 1603 atomic_t s_warning_count; 1604 atomic_t s_msg_count; 1605 1606 /* Encryption policy for '-o test_dummy_encryption' */ 1607 struct fscrypt_dummy_policy s_dummy_enc_policy; 1608 1609 /* 1610 * Barrier between writepages ops and changing any inode's JOURNAL_DATA 1611 * or EXTENTS flag. 1612 */ 1613 struct percpu_rw_semaphore s_writepages_rwsem; 1614 struct dax_device *s_daxdev; 1615 #ifdef CONFIG_EXT4_DEBUG 1616 unsigned long s_simulate_fail; 1617 #endif 1618 /* Record the errseq of the backing block device */ 1619 errseq_t s_bdev_wb_err; 1620 spinlock_t s_bdev_wb_lock; 1621 1622 /* Ext4 fast commit stuff */ 1623 atomic_t s_fc_subtid; 1624 atomic_t s_fc_ineligible_updates; 1625 /* 1626 * After commit starts, the main queue gets locked, and the further 1627 * updates get added in the staging queue. 1628 */ 1629 #define FC_Q_MAIN 0 1630 #define FC_Q_STAGING 1 1631 struct list_head s_fc_q[2]; /* Inodes staged for fast commit 1632 * that have data changes in them. 1633 */ 1634 struct list_head s_fc_dentry_q[2]; /* directory entry updates */ 1635 unsigned int s_fc_bytes; 1636 /* 1637 * Main fast commit lock. This lock protects accesses to the 1638 * following fields: 1639 * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh. 1640 */ 1641 spinlock_t s_fc_lock; 1642 struct buffer_head *s_fc_bh; 1643 struct ext4_fc_stats s_fc_stats; 1644 u64 s_fc_avg_commit_time; 1645 #ifdef CONFIG_EXT4_DEBUG 1646 int s_fc_debug_max_replay; 1647 #endif 1648 struct ext4_fc_replay_state s_fc_replay_state; 1649 }; 1650 1651 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1652 { 1653 return sb->s_fs_info; 1654 } 1655 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1656 { 1657 return container_of(inode, struct ext4_inode_info, vfs_inode); 1658 } 1659 1660 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1661 { 1662 return ino == EXT4_ROOT_INO || 1663 (ino >= EXT4_FIRST_INO(sb) && 1664 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1665 } 1666 1667 /* 1668 * Returns: sbi->field[index] 1669 * Used to access an array element from the following sbi fields which require 1670 * rcu protection to avoid dereferencing an invalid pointer due to reassignment 1671 * - s_group_desc 1672 * - s_group_info 1673 * - s_flex_group 1674 */ 1675 #define sbi_array_rcu_deref(sbi, field, index) \ 1676 ({ \ 1677 typeof(*((sbi)->field)) _v; \ 1678 rcu_read_lock(); \ 1679 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \ 1680 rcu_read_unlock(); \ 1681 _v; \ 1682 }) 1683 1684 /* 1685 * run-time mount flags 1686 */ 1687 enum { 1688 EXT4_MF_MNTDIR_SAMPLED, 1689 EXT4_MF_FS_ABORTED, /* Fatal error detected */ 1690 EXT4_MF_FC_INELIGIBLE, /* Fast commit ineligible */ 1691 EXT4_MF_FC_COMMITTING /* File system underoing a fast 1692 * commit. 1693 */ 1694 }; 1695 1696 static inline void ext4_set_mount_flag(struct super_block *sb, int bit) 1697 { 1698 set_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1699 } 1700 1701 static inline void ext4_clear_mount_flag(struct super_block *sb, int bit) 1702 { 1703 clear_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1704 } 1705 1706 static inline int ext4_test_mount_flag(struct super_block *sb, int bit) 1707 { 1708 return test_bit(bit, &EXT4_SB(sb)->s_mount_flags); 1709 } 1710 1711 1712 /* 1713 * Simulate_fail codes 1714 */ 1715 #define EXT4_SIM_BBITMAP_EIO 1 1716 #define EXT4_SIM_BBITMAP_CRC 2 1717 #define EXT4_SIM_IBITMAP_EIO 3 1718 #define EXT4_SIM_IBITMAP_CRC 4 1719 #define EXT4_SIM_INODE_EIO 5 1720 #define EXT4_SIM_INODE_CRC 6 1721 #define EXT4_SIM_DIRBLOCK_EIO 7 1722 #define EXT4_SIM_DIRBLOCK_CRC 8 1723 1724 static inline bool ext4_simulate_fail(struct super_block *sb, 1725 unsigned long code) 1726 { 1727 #ifdef CONFIG_EXT4_DEBUG 1728 struct ext4_sb_info *sbi = EXT4_SB(sb); 1729 1730 if (unlikely(sbi->s_simulate_fail == code)) { 1731 sbi->s_simulate_fail = 0; 1732 return true; 1733 } 1734 #endif 1735 return false; 1736 } 1737 1738 static inline void ext4_simulate_fail_bh(struct super_block *sb, 1739 struct buffer_head *bh, 1740 unsigned long code) 1741 { 1742 if (!IS_ERR(bh) && ext4_simulate_fail(sb, code)) 1743 clear_buffer_uptodate(bh); 1744 } 1745 1746 /* 1747 * Error number codes for s_{first,last}_error_errno 1748 * 1749 * Linux errno numbers are architecture specific, so we need to translate 1750 * them into something which is architecture independent. We don't define 1751 * codes for all errno's; just the ones which are most likely to be the cause 1752 * of an ext4_error() call. 1753 */ 1754 #define EXT4_ERR_UNKNOWN 1 1755 #define EXT4_ERR_EIO 2 1756 #define EXT4_ERR_ENOMEM 3 1757 #define EXT4_ERR_EFSBADCRC 4 1758 #define EXT4_ERR_EFSCORRUPTED 5 1759 #define EXT4_ERR_ENOSPC 6 1760 #define EXT4_ERR_ENOKEY 7 1761 #define EXT4_ERR_EROFS 8 1762 #define EXT4_ERR_EFBIG 9 1763 #define EXT4_ERR_EEXIST 10 1764 #define EXT4_ERR_ERANGE 11 1765 #define EXT4_ERR_EOVERFLOW 12 1766 #define EXT4_ERR_EBUSY 13 1767 #define EXT4_ERR_ENOTDIR 14 1768 #define EXT4_ERR_ENOTEMPTY 15 1769 #define EXT4_ERR_ESHUTDOWN 16 1770 #define EXT4_ERR_EFAULT 17 1771 1772 /* 1773 * Inode dynamic state flags 1774 */ 1775 enum { 1776 EXT4_STATE_JDATA, /* journaled data exists */ 1777 EXT4_STATE_NEW, /* inode is newly created */ 1778 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1779 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1780 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1781 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1782 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1783 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1784 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1785 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */ 1786 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */ 1787 EXT4_STATE_FC_COMMITTING, /* Fast commit ongoing */ 1788 }; 1789 1790 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1791 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1792 { \ 1793 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1794 } \ 1795 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1796 { \ 1797 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1798 } \ 1799 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1800 { \ 1801 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1802 } 1803 1804 /* Add these declarations here only so that these functions can be 1805 * found by name. Otherwise, they are very hard to locate. */ 1806 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1807 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1808 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1809 EXT4_INODE_BIT_FNS(flag, flags, 0) 1810 1811 /* Add these declarations here only so that these functions can be 1812 * found by name. Otherwise, they are very hard to locate. */ 1813 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1814 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1815 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1816 #if (BITS_PER_LONG < 64) 1817 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1818 1819 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1820 { 1821 (ei)->i_state_flags = 0; 1822 } 1823 #else 1824 EXT4_INODE_BIT_FNS(state, flags, 32) 1825 1826 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1827 { 1828 /* We depend on the fact that callers will set i_flags */ 1829 } 1830 #endif 1831 #else 1832 /* Assume that user mode programs are passing in an ext4fs superblock, not 1833 * a kernel struct super_block. This will allow us to call the feature-test 1834 * macros from user land. */ 1835 #define EXT4_SB(sb) (sb) 1836 #endif 1837 1838 static inline bool ext4_verity_in_progress(struct inode *inode) 1839 { 1840 return IS_ENABLED(CONFIG_FS_VERITY) && 1841 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS); 1842 } 1843 1844 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1845 1846 /* 1847 * Codes for operating systems 1848 */ 1849 #define EXT4_OS_LINUX 0 1850 #define EXT4_OS_HURD 1 1851 #define EXT4_OS_MASIX 2 1852 #define EXT4_OS_FREEBSD 3 1853 #define EXT4_OS_LITES 4 1854 1855 /* 1856 * Revision levels 1857 */ 1858 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1859 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1860 1861 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1862 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1863 1864 #define EXT4_GOOD_OLD_INODE_SIZE 128 1865 1866 #define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN) 1867 #define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX 1868 #define EXT4_TIMESTAMP_MIN S32_MIN 1869 1870 /* 1871 * Feature set definitions 1872 */ 1873 1874 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1875 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1876 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1877 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1878 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1879 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1880 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1881 /* 1882 * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes 1883 * incompatible only if fast commit blocks are present in the FS. Since we 1884 * clear the journal (and thus the fast commit blocks), we don't mark FS as 1885 * incompatible. We also have a JBD2 incompat feature, which gets set when 1886 * there are fast commit blocks present in the journal. 1887 */ 1888 #define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400 1889 #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800 1890 1891 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1892 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1893 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1894 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1895 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1896 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1897 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1898 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1899 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1900 /* 1901 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1902 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1903 * all other data structures' checksums. However, the METADATA_CSUM and 1904 * GDT_CSUM bits are mutually exclusive. 1905 */ 1906 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1907 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1908 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 1909 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000 1910 1911 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1912 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1913 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1914 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1915 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1916 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1917 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1918 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1919 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1920 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1921 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1922 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 1923 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1924 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1925 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1926 #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000 1927 1928 extern void ext4_update_dynamic_rev(struct super_block *sb); 1929 1930 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 1931 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1932 { \ 1933 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1934 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 1935 } \ 1936 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1937 { \ 1938 ext4_update_dynamic_rev(sb); \ 1939 EXT4_SB(sb)->s_es->s_feature_compat |= \ 1940 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1941 } \ 1942 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1943 { \ 1944 EXT4_SB(sb)->s_es->s_feature_compat &= \ 1945 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1946 } 1947 1948 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 1949 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1950 { \ 1951 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1952 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 1953 } \ 1954 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1955 { \ 1956 ext4_update_dynamic_rev(sb); \ 1957 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 1958 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1959 } \ 1960 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1961 { \ 1962 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 1963 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1964 } 1965 1966 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 1967 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1968 { \ 1969 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1970 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 1971 } \ 1972 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1973 { \ 1974 ext4_update_dynamic_rev(sb); \ 1975 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 1976 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1977 } \ 1978 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1979 { \ 1980 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 1981 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1982 } 1983 1984 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 1985 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 1986 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 1987 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 1988 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 1989 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 1990 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 1991 EXT4_FEATURE_COMPAT_FUNCS(fast_commit, FAST_COMMIT) 1992 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES) 1993 1994 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 1995 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 1996 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 1997 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 1998 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 1999 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 2000 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 2001 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 2002 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 2003 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 2004 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 2005 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 2006 EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY) 2007 2008 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 2009 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 2010 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 2011 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 2012 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 2013 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 2014 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 2015 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 2016 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 2017 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 2018 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 2019 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 2020 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 2021 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 2022 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 2023 EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD) 2024 2025 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2026 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2027 EXT4_FEATURE_INCOMPAT_META_BG) 2028 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2029 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2030 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 2031 2032 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2033 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2034 EXT4_FEATURE_INCOMPAT_RECOVER| \ 2035 EXT4_FEATURE_INCOMPAT_META_BG) 2036 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2037 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2038 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 2039 2040 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 2041 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 2042 EXT4_FEATURE_INCOMPAT_RECOVER| \ 2043 EXT4_FEATURE_INCOMPAT_META_BG| \ 2044 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 2045 EXT4_FEATURE_INCOMPAT_64BIT| \ 2046 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 2047 EXT4_FEATURE_INCOMPAT_EA_INODE| \ 2048 EXT4_FEATURE_INCOMPAT_MMP | \ 2049 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 2050 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 2051 EXT4_FEATURE_INCOMPAT_CASEFOLD | \ 2052 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \ 2053 EXT4_FEATURE_INCOMPAT_LARGEDIR) 2054 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 2055 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 2056 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 2057 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 2058 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 2059 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 2060 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 2061 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 2062 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 2063 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 2064 EXT4_FEATURE_RO_COMPAT_PROJECT |\ 2065 EXT4_FEATURE_RO_COMPAT_VERITY) 2066 2067 #define EXTN_FEATURE_FUNCS(ver) \ 2068 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 2069 { \ 2070 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 2071 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 2072 } \ 2073 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 2074 { \ 2075 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 2076 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 2077 } \ 2078 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 2079 { \ 2080 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 2081 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 2082 } 2083 2084 EXTN_FEATURE_FUNCS(2) 2085 EXTN_FEATURE_FUNCS(3) 2086 EXTN_FEATURE_FUNCS(4) 2087 2088 static inline bool ext4_has_compat_features(struct super_block *sb) 2089 { 2090 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 2091 } 2092 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 2093 { 2094 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 2095 } 2096 static inline bool ext4_has_incompat_features(struct super_block *sb) 2097 { 2098 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 2099 } 2100 2101 /* 2102 * Superblock flags 2103 */ 2104 #define EXT4_FLAGS_RESIZING 0 2105 #define EXT4_FLAGS_SHUTDOWN 1 2106 #define EXT4_FLAGS_BDEV_IS_DAX 2 2107 2108 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi) 2109 { 2110 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 2111 } 2112 2113 2114 /* 2115 * Default values for user and/or group using reserved blocks 2116 */ 2117 #define EXT4_DEF_RESUID 0 2118 #define EXT4_DEF_RESGID 0 2119 2120 /* 2121 * Default project ID 2122 */ 2123 #define EXT4_DEF_PROJID 0 2124 2125 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 2126 2127 /* 2128 * Default mount options 2129 */ 2130 #define EXT4_DEFM_DEBUG 0x0001 2131 #define EXT4_DEFM_BSDGROUPS 0x0002 2132 #define EXT4_DEFM_XATTR_USER 0x0004 2133 #define EXT4_DEFM_ACL 0x0008 2134 #define EXT4_DEFM_UID16 0x0010 2135 #define EXT4_DEFM_JMODE 0x0060 2136 #define EXT4_DEFM_JMODE_DATA 0x0020 2137 #define EXT4_DEFM_JMODE_ORDERED 0x0040 2138 #define EXT4_DEFM_JMODE_WBACK 0x0060 2139 #define EXT4_DEFM_NOBARRIER 0x0100 2140 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 2141 #define EXT4_DEFM_DISCARD 0x0400 2142 #define EXT4_DEFM_NODELALLOC 0x0800 2143 2144 /* 2145 * Default journal batch times 2146 */ 2147 #define EXT4_DEF_MIN_BATCH_TIME 0 2148 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 2149 2150 /* 2151 * Minimum number of groups in a flexgroup before we separate out 2152 * directories into the first block group of a flexgroup 2153 */ 2154 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 2155 2156 /* 2157 * Structure of a directory entry 2158 */ 2159 #define EXT4_NAME_LEN 255 2160 2161 struct ext4_dir_entry { 2162 __le32 inode; /* Inode number */ 2163 __le16 rec_len; /* Directory entry length */ 2164 __le16 name_len; /* Name length */ 2165 char name[EXT4_NAME_LEN]; /* File name */ 2166 }; 2167 2168 /* 2169 * The new version of the directory entry. Since EXT4 structures are 2170 * stored in intel byte order, and the name_len field could never be 2171 * bigger than 255 chars, it's safe to reclaim the extra byte for the 2172 * file_type field. 2173 */ 2174 struct ext4_dir_entry_2 { 2175 __le32 inode; /* Inode number */ 2176 __le16 rec_len; /* Directory entry length */ 2177 __u8 name_len; /* Name length */ 2178 __u8 file_type; /* See file type macros EXT4_FT_* below */ 2179 char name[EXT4_NAME_LEN]; /* File name */ 2180 }; 2181 2182 /* 2183 * This is a bogus directory entry at the end of each leaf block that 2184 * records checksums. 2185 */ 2186 struct ext4_dir_entry_tail { 2187 __le32 det_reserved_zero1; /* Pretend to be unused */ 2188 __le16 det_rec_len; /* 12 */ 2189 __u8 det_reserved_zero2; /* Zero name length */ 2190 __u8 det_reserved_ft; /* 0xDE, fake file type */ 2191 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 2192 }; 2193 2194 #define EXT4_DIRENT_TAIL(block, blocksize) \ 2195 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 2196 ((blocksize) - \ 2197 sizeof(struct ext4_dir_entry_tail)))) 2198 2199 /* 2200 * Ext4 directory file types. Only the low 3 bits are used. The 2201 * other bits are reserved for now. 2202 */ 2203 #define EXT4_FT_UNKNOWN 0 2204 #define EXT4_FT_REG_FILE 1 2205 #define EXT4_FT_DIR 2 2206 #define EXT4_FT_CHRDEV 3 2207 #define EXT4_FT_BLKDEV 4 2208 #define EXT4_FT_FIFO 5 2209 #define EXT4_FT_SOCK 6 2210 #define EXT4_FT_SYMLINK 7 2211 2212 #define EXT4_FT_MAX 8 2213 2214 #define EXT4_FT_DIR_CSUM 0xDE 2215 2216 /* 2217 * EXT4_DIR_PAD defines the directory entries boundaries 2218 * 2219 * NOTE: It must be a multiple of 4 2220 */ 2221 #define EXT4_DIR_PAD 4 2222 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 2223 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 2224 ~EXT4_DIR_ROUND) 2225 #define EXT4_MAX_REC_LEN ((1<<16)-1) 2226 2227 /* 2228 * If we ever get support for fs block sizes > page_size, we'll need 2229 * to remove the #if statements in the next two functions... 2230 */ 2231 static inline unsigned int 2232 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 2233 { 2234 unsigned len = le16_to_cpu(dlen); 2235 2236 #if (PAGE_SIZE >= 65536) 2237 if (len == EXT4_MAX_REC_LEN || len == 0) 2238 return blocksize; 2239 return (len & 65532) | ((len & 3) << 16); 2240 #else 2241 return len; 2242 #endif 2243 } 2244 2245 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 2246 { 2247 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 2248 BUG(); 2249 #if (PAGE_SIZE >= 65536) 2250 if (len < 65536) 2251 return cpu_to_le16(len); 2252 if (len == blocksize) { 2253 if (blocksize == 65536) 2254 return cpu_to_le16(EXT4_MAX_REC_LEN); 2255 else 2256 return cpu_to_le16(0); 2257 } 2258 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 2259 #else 2260 return cpu_to_le16(len); 2261 #endif 2262 } 2263 2264 /* 2265 * Hash Tree Directory indexing 2266 * (c) Daniel Phillips, 2001 2267 */ 2268 2269 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2270 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2271 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \ 2272 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir))) 2273 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2274 2275 /* Legal values for the dx_root hash_version field: */ 2276 2277 #define DX_HASH_LEGACY 0 2278 #define DX_HASH_HALF_MD4 1 2279 #define DX_HASH_TEA 2 2280 #define DX_HASH_LEGACY_UNSIGNED 3 2281 #define DX_HASH_HALF_MD4_UNSIGNED 4 2282 #define DX_HASH_TEA_UNSIGNED 5 2283 2284 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 2285 const void *address, unsigned int length) 2286 { 2287 struct { 2288 struct shash_desc shash; 2289 char ctx[4]; 2290 } desc; 2291 2292 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2293 2294 desc.shash.tfm = sbi->s_chksum_driver; 2295 *(u32 *)desc.ctx = crc; 2296 2297 BUG_ON(crypto_shash_update(&desc.shash, address, length)); 2298 2299 return *(u32 *)desc.ctx; 2300 } 2301 2302 #ifdef __KERNEL__ 2303 2304 /* hash info structure used by the directory hash */ 2305 struct dx_hash_info 2306 { 2307 u32 hash; 2308 u32 minor_hash; 2309 int hash_version; 2310 u32 *seed; 2311 }; 2312 2313 2314 /* 32 and 64 bit signed EOF for dx directories */ 2315 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2316 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2317 2318 2319 /* 2320 * Control parameters used by ext4_htree_next_block 2321 */ 2322 #define HASH_NB_ALWAYS 1 2323 2324 struct ext4_filename { 2325 const struct qstr *usr_fname; 2326 struct fscrypt_str disk_name; 2327 struct dx_hash_info hinfo; 2328 #ifdef CONFIG_FS_ENCRYPTION 2329 struct fscrypt_str crypto_buf; 2330 #endif 2331 #ifdef CONFIG_UNICODE 2332 struct fscrypt_str cf_name; 2333 #endif 2334 }; 2335 2336 #define fname_name(p) ((p)->disk_name.name) 2337 #define fname_len(p) ((p)->disk_name.len) 2338 2339 /* 2340 * Describe an inode's exact location on disk and in memory 2341 */ 2342 struct ext4_iloc 2343 { 2344 struct buffer_head *bh; 2345 unsigned long offset; 2346 ext4_group_t block_group; 2347 }; 2348 2349 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2350 { 2351 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2352 } 2353 2354 static inline bool ext4_is_quota_file(struct inode *inode) 2355 { 2356 return IS_NOQUOTA(inode) && 2357 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL); 2358 } 2359 2360 /* 2361 * This structure is stuffed into the struct file's private_data field 2362 * for directories. It is where we put information so that we can do 2363 * readdir operations in hash tree order. 2364 */ 2365 struct dir_private_info { 2366 struct rb_root root; 2367 struct rb_node *curr_node; 2368 struct fname *extra_fname; 2369 loff_t last_pos; 2370 __u32 curr_hash; 2371 __u32 curr_minor_hash; 2372 __u32 next_hash; 2373 }; 2374 2375 /* calculate the first block number of the group */ 2376 static inline ext4_fsblk_t 2377 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2378 { 2379 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2380 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2381 } 2382 2383 /* 2384 * Special error return code only used by dx_probe() and its callers. 2385 */ 2386 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2387 2388 /* htree levels for ext4 */ 2389 #define EXT4_HTREE_LEVEL_COMPAT 2 2390 #define EXT4_HTREE_LEVEL 3 2391 2392 static inline int ext4_dir_htree_level(struct super_block *sb) 2393 { 2394 return ext4_has_feature_largedir(sb) ? 2395 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT; 2396 } 2397 2398 /* 2399 * Timeout and state flag for lazy initialization inode thread. 2400 */ 2401 #define EXT4_DEF_LI_WAIT_MULT 10 2402 #define EXT4_DEF_LI_MAX_START_DELAY 5 2403 #define EXT4_LAZYINIT_QUIT 0x0001 2404 #define EXT4_LAZYINIT_RUNNING 0x0002 2405 2406 /* 2407 * Lazy inode table initialization info 2408 */ 2409 struct ext4_lazy_init { 2410 unsigned long li_state; 2411 struct list_head li_request_list; 2412 struct mutex li_list_mtx; 2413 }; 2414 2415 enum ext4_li_mode { 2416 EXT4_LI_MODE_PREFETCH_BBITMAP, 2417 EXT4_LI_MODE_ITABLE, 2418 }; 2419 2420 struct ext4_li_request { 2421 struct super_block *lr_super; 2422 enum ext4_li_mode lr_mode; 2423 ext4_group_t lr_first_not_zeroed; 2424 ext4_group_t lr_next_group; 2425 struct list_head lr_request; 2426 unsigned long lr_next_sched; 2427 unsigned long lr_timeout; 2428 }; 2429 2430 struct ext4_features { 2431 struct kobject f_kobj; 2432 struct completion f_kobj_unregister; 2433 }; 2434 2435 /* 2436 * This structure will be used for multiple mount protection. It will be 2437 * written into the block number saved in the s_mmp_block field in the 2438 * superblock. Programs that check MMP should assume that if 2439 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2440 * to use the filesystem, regardless of how old the timestamp is. 2441 */ 2442 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2443 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2444 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2445 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2446 2447 struct mmp_struct { 2448 __le32 mmp_magic; /* Magic number for MMP */ 2449 __le32 mmp_seq; /* Sequence no. updated periodically */ 2450 2451 /* 2452 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2453 * purposes and do not affect the correctness of the algorithm 2454 */ 2455 __le64 mmp_time; /* Time last updated */ 2456 char mmp_nodename[64]; /* Node which last updated MMP block */ 2457 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2458 2459 /* 2460 * mmp_check_interval is used to verify if the MMP block has been 2461 * updated on the block device. The value is updated based on the 2462 * maximum time to write the MMP block during an update cycle. 2463 */ 2464 __le16 mmp_check_interval; 2465 2466 __le16 mmp_pad1; 2467 __le32 mmp_pad2[226]; 2468 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2469 }; 2470 2471 /* arguments passed to the mmp thread */ 2472 struct mmpd_data { 2473 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2474 struct super_block *sb; /* super block of the fs */ 2475 }; 2476 2477 /* 2478 * Check interval multiplier 2479 * The MMP block is written every update interval and initially checked every 2480 * update interval x the multiplier (the value is then adapted based on the 2481 * write latency). The reason is that writes can be delayed under load and we 2482 * don't want readers to incorrectly assume that the filesystem is no longer 2483 * in use. 2484 */ 2485 #define EXT4_MMP_CHECK_MULT 2UL 2486 2487 /* 2488 * Minimum interval for MMP checking in seconds. 2489 */ 2490 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2491 2492 /* 2493 * Maximum interval for MMP checking in seconds. 2494 */ 2495 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2496 2497 /* 2498 * Function prototypes 2499 */ 2500 2501 /* 2502 * Ok, these declarations are also in <linux/kernel.h> but none of the 2503 * ext4 source programs needs to include it so they are duplicated here. 2504 */ 2505 # define NORET_TYPE /**/ 2506 # define ATTRIB_NORET __attribute__((noreturn)) 2507 # define NORET_AND noreturn, 2508 2509 /* bitmap.c */ 2510 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2511 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2512 struct ext4_group_desc *gdp, 2513 struct buffer_head *bh, int sz); 2514 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2515 struct ext4_group_desc *gdp, 2516 struct buffer_head *bh, int sz); 2517 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2518 struct ext4_group_desc *gdp, 2519 struct buffer_head *bh); 2520 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2521 struct ext4_group_desc *gdp, 2522 struct buffer_head *bh); 2523 2524 /* balloc.c */ 2525 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2526 ext4_fsblk_t blocknr, 2527 ext4_group_t *blockgrpp, 2528 ext4_grpblk_t *offsetp); 2529 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2530 ext4_fsblk_t block); 2531 2532 extern unsigned int ext4_block_group(struct super_block *sb, 2533 ext4_fsblk_t blocknr); 2534 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2535 ext4_fsblk_t blocknr); 2536 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2537 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2538 ext4_group_t group); 2539 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2540 ext4_fsblk_t goal, 2541 unsigned int flags, 2542 unsigned long *count, 2543 int *errp); 2544 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2545 s64 nclusters, unsigned int flags); 2546 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2547 extern void ext4_check_blocks_bitmap(struct super_block *); 2548 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2549 ext4_group_t block_group, 2550 struct buffer_head ** bh); 2551 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2552 2553 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2554 ext4_group_t block_group, 2555 bool ignore_locked); 2556 extern int ext4_wait_block_bitmap(struct super_block *sb, 2557 ext4_group_t block_group, 2558 struct buffer_head *bh); 2559 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2560 ext4_group_t block_group); 2561 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2562 ext4_group_t block_group, 2563 struct ext4_group_desc *gdp); 2564 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2565 2566 #ifdef CONFIG_UNICODE 2567 extern void ext4_fname_setup_ci_filename(struct inode *dir, 2568 const struct qstr *iname, 2569 struct fscrypt_str *fname); 2570 #endif 2571 2572 #ifdef CONFIG_FS_ENCRYPTION 2573 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst, 2574 const struct fscrypt_name *src) 2575 { 2576 memset(dst, 0, sizeof(*dst)); 2577 2578 dst->usr_fname = src->usr_fname; 2579 dst->disk_name = src->disk_name; 2580 dst->hinfo.hash = src->hash; 2581 dst->hinfo.minor_hash = src->minor_hash; 2582 dst->crypto_buf = src->crypto_buf; 2583 } 2584 2585 static inline int ext4_fname_setup_filename(struct inode *dir, 2586 const struct qstr *iname, 2587 int lookup, 2588 struct ext4_filename *fname) 2589 { 2590 struct fscrypt_name name; 2591 int err; 2592 2593 err = fscrypt_setup_filename(dir, iname, lookup, &name); 2594 if (err) 2595 return err; 2596 2597 ext4_fname_from_fscrypt_name(fname, &name); 2598 2599 #ifdef CONFIG_UNICODE 2600 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name); 2601 #endif 2602 return 0; 2603 } 2604 2605 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2606 struct dentry *dentry, 2607 struct ext4_filename *fname) 2608 { 2609 struct fscrypt_name name; 2610 int err; 2611 2612 err = fscrypt_prepare_lookup(dir, dentry, &name); 2613 if (err) 2614 return err; 2615 2616 ext4_fname_from_fscrypt_name(fname, &name); 2617 2618 #ifdef CONFIG_UNICODE 2619 ext4_fname_setup_ci_filename(dir, &dentry->d_name, &fname->cf_name); 2620 #endif 2621 return 0; 2622 } 2623 2624 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2625 { 2626 struct fscrypt_name name; 2627 2628 name.crypto_buf = fname->crypto_buf; 2629 fscrypt_free_filename(&name); 2630 2631 fname->crypto_buf.name = NULL; 2632 fname->usr_fname = NULL; 2633 fname->disk_name.name = NULL; 2634 2635 #ifdef CONFIG_UNICODE 2636 kfree(fname->cf_name.name); 2637 fname->cf_name.name = NULL; 2638 #endif 2639 } 2640 #else /* !CONFIG_FS_ENCRYPTION */ 2641 static inline int ext4_fname_setup_filename(struct inode *dir, 2642 const struct qstr *iname, 2643 int lookup, 2644 struct ext4_filename *fname) 2645 { 2646 fname->usr_fname = iname; 2647 fname->disk_name.name = (unsigned char *) iname->name; 2648 fname->disk_name.len = iname->len; 2649 2650 #ifdef CONFIG_UNICODE 2651 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name); 2652 #endif 2653 2654 return 0; 2655 } 2656 2657 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2658 struct dentry *dentry, 2659 struct ext4_filename *fname) 2660 { 2661 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname); 2662 } 2663 2664 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2665 { 2666 #ifdef CONFIG_UNICODE 2667 kfree(fname->cf_name.name); 2668 fname->cf_name.name = NULL; 2669 #endif 2670 } 2671 #endif /* !CONFIG_FS_ENCRYPTION */ 2672 2673 /* dir.c */ 2674 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2675 struct file *, 2676 struct ext4_dir_entry_2 *, 2677 struct buffer_head *, char *, int, 2678 unsigned int); 2679 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2680 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2681 (de), (bh), (buf), (size), (offset))) 2682 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2683 __u32 minor_hash, 2684 struct ext4_dir_entry_2 *dirent, 2685 struct fscrypt_str *ent_name); 2686 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2687 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2688 struct buffer_head *bh, 2689 void *buf, int buf_size, 2690 struct ext4_filename *fname, 2691 struct ext4_dir_entry_2 **dest_de); 2692 void ext4_insert_dentry(struct inode *inode, 2693 struct ext4_dir_entry_2 *de, 2694 int buf_size, 2695 struct ext4_filename *fname); 2696 static inline void ext4_update_dx_flag(struct inode *inode) 2697 { 2698 if (!ext4_has_feature_dir_index(inode->i_sb) && 2699 ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) { 2700 /* ext4_iget() should have caught this... */ 2701 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb)); 2702 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2703 } 2704 } 2705 static const unsigned char ext4_filetype_table[] = { 2706 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2707 }; 2708 2709 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2710 { 2711 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2712 return DT_UNKNOWN; 2713 2714 return ext4_filetype_table[filetype]; 2715 } 2716 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2717 void *buf, int buf_size); 2718 2719 /* fsync.c */ 2720 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2721 2722 /* hash.c */ 2723 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len, 2724 struct dx_hash_info *hinfo); 2725 2726 /* ialloc.c */ 2727 extern int ext4_mark_inode_used(struct super_block *sb, int ino); 2728 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2729 const struct qstr *qstr, __u32 goal, 2730 uid_t *owner, __u32 i_flags, 2731 int handle_type, unsigned int line_no, 2732 int nblocks); 2733 2734 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \ 2735 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2736 i_flags, 0, 0, 0) 2737 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2738 type, nblocks) \ 2739 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2740 0, (type), __LINE__, (nblocks)) 2741 2742 2743 extern void ext4_free_inode(handle_t *, struct inode *); 2744 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2745 extern unsigned long ext4_count_free_inodes(struct super_block *); 2746 extern unsigned long ext4_count_dirs(struct super_block *); 2747 extern void ext4_check_inodes_bitmap(struct super_block *); 2748 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2749 extern int ext4_init_inode_table(struct super_block *sb, 2750 ext4_group_t group, int barrier); 2751 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2752 2753 /* fast_commit.c */ 2754 int ext4_fc_info_show(struct seq_file *seq, void *v); 2755 void ext4_fc_init(struct super_block *sb, journal_t *journal); 2756 void ext4_fc_init_inode(struct inode *inode); 2757 void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start, 2758 ext4_lblk_t end); 2759 void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode, 2760 struct dentry *dentry); 2761 void __ext4_fc_track_link(handle_t *handle, struct inode *inode, 2762 struct dentry *dentry); 2763 void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry); 2764 void ext4_fc_track_link(handle_t *handle, struct dentry *dentry); 2765 void ext4_fc_track_create(handle_t *handle, struct dentry *dentry); 2766 void ext4_fc_track_inode(handle_t *handle, struct inode *inode); 2767 void ext4_fc_mark_ineligible(struct super_block *sb, int reason); 2768 void ext4_fc_start_ineligible(struct super_block *sb, int reason); 2769 void ext4_fc_stop_ineligible(struct super_block *sb); 2770 void ext4_fc_start_update(struct inode *inode); 2771 void ext4_fc_stop_update(struct inode *inode); 2772 void ext4_fc_del(struct inode *inode); 2773 bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block); 2774 void ext4_fc_replay_cleanup(struct super_block *sb); 2775 int ext4_fc_commit(journal_t *journal, tid_t commit_tid); 2776 int __init ext4_fc_init_dentry_cache(void); 2777 2778 /* mballoc.c */ 2779 extern const struct seq_operations ext4_mb_seq_groups_ops; 2780 extern long ext4_mb_stats; 2781 extern long ext4_mb_max_to_scan; 2782 extern int ext4_mb_init(struct super_block *); 2783 extern int ext4_mb_release(struct super_block *); 2784 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2785 struct ext4_allocation_request *, int *); 2786 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2787 extern void ext4_discard_preallocations(struct inode *, unsigned int); 2788 extern int __init ext4_init_mballoc(void); 2789 extern void ext4_exit_mballoc(void); 2790 extern ext4_group_t ext4_mb_prefetch(struct super_block *sb, 2791 ext4_group_t group, 2792 unsigned int nr, int *cnt); 2793 extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group, 2794 unsigned int nr); 2795 2796 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2797 struct buffer_head *bh, ext4_fsblk_t block, 2798 unsigned long count, int flags); 2799 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2800 ext4_group_t ngroups); 2801 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2802 ext4_group_t i, struct ext4_group_desc *desc); 2803 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2804 ext4_fsblk_t block, unsigned long count); 2805 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2806 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid); 2807 extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block, 2808 int len, int state); 2809 2810 /* inode.c */ 2811 void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw, 2812 struct ext4_inode_info *ei); 2813 int ext4_inode_is_fast_symlink(struct inode *inode); 2814 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2815 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2816 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count, 2817 bool wait, struct buffer_head **bhs); 2818 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2819 struct buffer_head *bh_result, int create); 2820 int ext4_get_block(struct inode *inode, sector_t iblock, 2821 struct buffer_head *bh_result, int create); 2822 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2823 struct buffer_head *bh, int create); 2824 int ext4_walk_page_buffers(handle_t *handle, 2825 struct buffer_head *head, 2826 unsigned from, 2827 unsigned to, 2828 int *partial, 2829 int (*fn)(handle_t *handle, 2830 struct buffer_head *bh)); 2831 int do_journal_get_write_access(handle_t *handle, 2832 struct buffer_head *bh); 2833 #define FALL_BACK_TO_NONDELALLOC 1 2834 #define CONVERT_INLINE_DATA 2 2835 2836 typedef enum { 2837 EXT4_IGET_NORMAL = 0, 2838 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */ 2839 EXT4_IGET_HANDLE = 0x0002 /* Inode # is from a handle */ 2840 } ext4_iget_flags; 2841 2842 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, 2843 ext4_iget_flags flags, const char *function, 2844 unsigned int line); 2845 2846 #define ext4_iget(sb, ino, flags) \ 2847 __ext4_iget((sb), (ino), (flags), __func__, __LINE__) 2848 2849 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2850 extern int ext4_setattr(struct dentry *, struct iattr *); 2851 extern int ext4_getattr(const struct path *, struct kstat *, u32, unsigned int); 2852 extern void ext4_evict_inode(struct inode *); 2853 extern void ext4_clear_inode(struct inode *); 2854 extern int ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int); 2855 extern int ext4_sync_inode(handle_t *, struct inode *); 2856 extern void ext4_dirty_inode(struct inode *, int); 2857 extern int ext4_change_inode_journal_flag(struct inode *, int); 2858 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2859 extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino, 2860 struct ext4_iloc *iloc); 2861 extern int ext4_inode_attach_jinode(struct inode *inode); 2862 extern int ext4_can_truncate(struct inode *inode); 2863 extern int ext4_truncate(struct inode *); 2864 extern int ext4_break_layouts(struct inode *); 2865 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2866 extern void ext4_set_inode_flags(struct inode *, bool init); 2867 extern int ext4_alloc_da_blocks(struct inode *inode); 2868 extern void ext4_set_aops(struct inode *inode); 2869 extern int ext4_writepage_trans_blocks(struct inode *); 2870 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2871 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2872 loff_t lstart, loff_t lend); 2873 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf); 2874 extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf); 2875 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2876 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 2877 extern void ext4_da_release_space(struct inode *inode, int to_free); 2878 extern void ext4_da_update_reserve_space(struct inode *inode, 2879 int used, int quota_claim); 2880 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 2881 ext4_fsblk_t pblk, ext4_lblk_t len); 2882 2883 /* indirect.c */ 2884 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2885 struct ext4_map_blocks *map, int flags); 2886 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2887 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2888 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2889 ext4_lblk_t start, ext4_lblk_t end); 2890 2891 /* ioctl.c */ 2892 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2893 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2894 extern void ext4_reset_inode_seed(struct inode *inode); 2895 2896 /* migrate.c */ 2897 extern int ext4_ext_migrate(struct inode *); 2898 extern int ext4_ind_migrate(struct inode *inode); 2899 2900 /* namei.c */ 2901 extern int ext4_init_new_dir(handle_t *handle, struct inode *dir, 2902 struct inode *inode); 2903 extern int ext4_dirblock_csum_verify(struct inode *inode, 2904 struct buffer_head *bh); 2905 extern int ext4_orphan_add(handle_t *, struct inode *); 2906 extern int ext4_orphan_del(handle_t *, struct inode *); 2907 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2908 __u32 start_minor_hash, __u32 *next_hash); 2909 extern int ext4_search_dir(struct buffer_head *bh, 2910 char *search_buf, 2911 int buf_size, 2912 struct inode *dir, 2913 struct ext4_filename *fname, 2914 unsigned int offset, 2915 struct ext4_dir_entry_2 **res_dir); 2916 extern int ext4_generic_delete_entry(struct inode *dir, 2917 struct ext4_dir_entry_2 *de_del, 2918 struct buffer_head *bh, 2919 void *entry_buf, 2920 int buf_size, 2921 int csum_size); 2922 extern bool ext4_empty_dir(struct inode *inode); 2923 2924 /* resize.c */ 2925 extern void ext4_kvfree_array_rcu(void *to_free); 2926 extern int ext4_group_add(struct super_block *sb, 2927 struct ext4_new_group_data *input); 2928 extern int ext4_group_extend(struct super_block *sb, 2929 struct ext4_super_block *es, 2930 ext4_fsblk_t n_blocks_count); 2931 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2932 2933 /* super.c */ 2934 extern struct buffer_head *ext4_sb_bread(struct super_block *sb, 2935 sector_t block, int op_flags); 2936 extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb, 2937 sector_t block); 2938 extern void ext4_read_bh_nowait(struct buffer_head *bh, int op_flags, 2939 bh_end_io_t *end_io); 2940 extern int ext4_read_bh(struct buffer_head *bh, int op_flags, 2941 bh_end_io_t *end_io); 2942 extern int ext4_read_bh_lock(struct buffer_head *bh, int op_flags, bool wait); 2943 extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block); 2944 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 2945 extern int ext4_calculate_overhead(struct super_block *sb); 2946 extern void ext4_superblock_csum_set(struct super_block *sb); 2947 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2948 ext4_group_t ngroup); 2949 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2950 char nbuf[16]); 2951 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb, 2952 ext4_group_t block_group, 2953 unsigned int flags); 2954 2955 extern __printf(6, 7) 2956 void __ext4_error(struct super_block *, const char *, unsigned int, int, __u64, 2957 const char *, ...); 2958 extern __printf(6, 7) 2959 void __ext4_error_inode(struct inode *, const char *, unsigned int, 2960 ext4_fsblk_t, int, const char *, ...); 2961 extern __printf(5, 6) 2962 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2963 const char *, ...); 2964 extern void __ext4_std_error(struct super_block *, const char *, 2965 unsigned int, int); 2966 extern __printf(5, 6) 2967 void __ext4_abort(struct super_block *, const char *, unsigned int, int, 2968 const char *, ...); 2969 extern __printf(4, 5) 2970 void __ext4_warning(struct super_block *, const char *, unsigned int, 2971 const char *, ...); 2972 extern __printf(4, 5) 2973 void __ext4_warning_inode(const struct inode *inode, const char *function, 2974 unsigned int line, const char *fmt, ...); 2975 extern __printf(3, 4) 2976 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2977 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2978 const char *, unsigned int, const char *); 2979 extern __printf(7, 8) 2980 void __ext4_grp_locked_error(const char *, unsigned int, 2981 struct super_block *, ext4_group_t, 2982 unsigned long, ext4_fsblk_t, 2983 const char *, ...); 2984 2985 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 2986 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 2987 2988 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \ 2989 __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a) 2990 2991 #define ext4_error_inode_block(inode, block, err, fmt, a...) \ 2992 __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \ 2993 (fmt), ## a) 2994 2995 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 2996 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 2997 2998 #ifdef CONFIG_PRINTK 2999 3000 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 3001 __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__) 3002 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 3003 __ext4_error_inode((inode), (func), (line), (block), \ 3004 (err), (fmt), ##__VA_ARGS__) 3005 #define ext4_error_file(file, func, line, block, fmt, ...) \ 3006 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 3007 #define ext4_error(sb, fmt, ...) \ 3008 __ext4_error((sb), __func__, __LINE__, 0, 0, (fmt), ##__VA_ARGS__) 3009 #define ext4_error_err(sb, err, fmt, ...) \ 3010 __ext4_error((sb), __func__, __LINE__, (err), 0, (fmt), ##__VA_ARGS__) 3011 #define ext4_abort(sb, err, fmt, ...) \ 3012 __ext4_abort((sb), __func__, __LINE__, (err), (fmt), ##__VA_ARGS__) 3013 #define ext4_warning(sb, fmt, ...) \ 3014 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 3015 #define ext4_warning_inode(inode, fmt, ...) \ 3016 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 3017 #define ext4_msg(sb, level, fmt, ...) \ 3018 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 3019 #define dump_mmp_msg(sb, mmp, msg) \ 3020 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 3021 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 3022 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 3023 fmt, ##__VA_ARGS__) 3024 3025 #else 3026 3027 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 3028 do { \ 3029 no_printk(fmt, ##__VA_ARGS__); \ 3030 __ext4_error_inode(inode, "", 0, block, 0, " "); \ 3031 } while (0) 3032 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 3033 do { \ 3034 no_printk(fmt, ##__VA_ARGS__); \ 3035 __ext4_error_inode(inode, "", 0, block, err, " "); \ 3036 } while (0) 3037 #define ext4_error_file(file, func, line, block, fmt, ...) \ 3038 do { \ 3039 no_printk(fmt, ##__VA_ARGS__); \ 3040 __ext4_error_file(file, "", 0, block, " "); \ 3041 } while (0) 3042 #define ext4_error(sb, fmt, ...) \ 3043 do { \ 3044 no_printk(fmt, ##__VA_ARGS__); \ 3045 __ext4_error(sb, "", 0, 0, 0, " "); \ 3046 } while (0) 3047 #define ext4_error_err(sb, err, fmt, ...) \ 3048 do { \ 3049 no_printk(fmt, ##__VA_ARGS__); \ 3050 __ext4_error(sb, "", 0, err, 0, " "); \ 3051 } while (0) 3052 #define ext4_abort(sb, err, fmt, ...) \ 3053 do { \ 3054 no_printk(fmt, ##__VA_ARGS__); \ 3055 __ext4_abort(sb, "", 0, err, " "); \ 3056 } while (0) 3057 #define ext4_warning(sb, fmt, ...) \ 3058 do { \ 3059 no_printk(fmt, ##__VA_ARGS__); \ 3060 __ext4_warning(sb, "", 0, " "); \ 3061 } while (0) 3062 #define ext4_warning_inode(inode, fmt, ...) \ 3063 do { \ 3064 no_printk(fmt, ##__VA_ARGS__); \ 3065 __ext4_warning_inode(inode, "", 0, " "); \ 3066 } while (0) 3067 #define ext4_msg(sb, level, fmt, ...) \ 3068 do { \ 3069 no_printk(fmt, ##__VA_ARGS__); \ 3070 __ext4_msg(sb, "", " "); \ 3071 } while (0) 3072 #define dump_mmp_msg(sb, mmp, msg) \ 3073 __dump_mmp_msg(sb, mmp, "", 0, "") 3074 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 3075 do { \ 3076 no_printk(fmt, ##__VA_ARGS__); \ 3077 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 3078 } while (0) 3079 3080 #endif 3081 3082 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 3083 struct ext4_group_desc *bg); 3084 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 3085 struct ext4_group_desc *bg); 3086 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 3087 struct ext4_group_desc *bg); 3088 extern __u32 ext4_free_group_clusters(struct super_block *sb, 3089 struct ext4_group_desc *bg); 3090 extern __u32 ext4_free_inodes_count(struct super_block *sb, 3091 struct ext4_group_desc *bg); 3092 extern __u32 ext4_used_dirs_count(struct super_block *sb, 3093 struct ext4_group_desc *bg); 3094 extern __u32 ext4_itable_unused_count(struct super_block *sb, 3095 struct ext4_group_desc *bg); 3096 extern void ext4_block_bitmap_set(struct super_block *sb, 3097 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3098 extern void ext4_inode_bitmap_set(struct super_block *sb, 3099 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3100 extern void ext4_inode_table_set(struct super_block *sb, 3101 struct ext4_group_desc *bg, ext4_fsblk_t blk); 3102 extern void ext4_free_group_clusters_set(struct super_block *sb, 3103 struct ext4_group_desc *bg, 3104 __u32 count); 3105 extern void ext4_free_inodes_set(struct super_block *sb, 3106 struct ext4_group_desc *bg, __u32 count); 3107 extern void ext4_used_dirs_set(struct super_block *sb, 3108 struct ext4_group_desc *bg, __u32 count); 3109 extern void ext4_itable_unused_set(struct super_block *sb, 3110 struct ext4_group_desc *bg, __u32 count); 3111 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 3112 struct ext4_group_desc *gdp); 3113 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 3114 struct ext4_group_desc *gdp); 3115 extern int ext4_register_li_request(struct super_block *sb, 3116 ext4_group_t first_not_zeroed); 3117 3118 static inline int ext4_has_metadata_csum(struct super_block *sb) 3119 { 3120 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 3121 !EXT4_SB(sb)->s_chksum_driver); 3122 3123 return ext4_has_feature_metadata_csum(sb) && 3124 (EXT4_SB(sb)->s_chksum_driver != NULL); 3125 } 3126 3127 static inline int ext4_has_group_desc_csum(struct super_block *sb) 3128 { 3129 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb); 3130 } 3131 3132 #define ext4_read_incompat_64bit_val(es, name) \ 3133 (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \ 3134 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \ 3135 le32_to_cpu(es->name##_lo)) 3136 3137 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 3138 { 3139 return ext4_read_incompat_64bit_val(es, s_blocks_count); 3140 } 3141 3142 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 3143 { 3144 return ext4_read_incompat_64bit_val(es, s_r_blocks_count); 3145 } 3146 3147 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 3148 { 3149 return ext4_read_incompat_64bit_val(es, s_free_blocks_count); 3150 } 3151 3152 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 3153 ext4_fsblk_t blk) 3154 { 3155 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 3156 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 3157 } 3158 3159 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 3160 ext4_fsblk_t blk) 3161 { 3162 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 3163 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 3164 } 3165 3166 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 3167 ext4_fsblk_t blk) 3168 { 3169 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 3170 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 3171 } 3172 3173 static inline loff_t ext4_isize(struct super_block *sb, 3174 struct ext4_inode *raw_inode) 3175 { 3176 if (ext4_has_feature_largedir(sb) || 3177 S_ISREG(le16_to_cpu(raw_inode->i_mode))) 3178 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 3179 le32_to_cpu(raw_inode->i_size_lo); 3180 3181 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 3182 } 3183 3184 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 3185 { 3186 raw_inode->i_size_lo = cpu_to_le32(i_size); 3187 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 3188 } 3189 3190 static inline 3191 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 3192 ext4_group_t group) 3193 { 3194 struct ext4_group_info **grp_info; 3195 long indexv, indexh; 3196 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 3197 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 3198 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 3199 grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv); 3200 return grp_info[indexh]; 3201 } 3202 3203 /* 3204 * Reading s_groups_count requires using smp_rmb() afterwards. See 3205 * the locking protocol documented in the comments of ext4_group_add() 3206 * in resize.c 3207 */ 3208 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 3209 { 3210 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 3211 3212 smp_rmb(); 3213 return ngroups; 3214 } 3215 3216 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 3217 ext4_group_t block_group) 3218 { 3219 return block_group >> sbi->s_log_groups_per_flex; 3220 } 3221 3222 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 3223 { 3224 return 1 << sbi->s_log_groups_per_flex; 3225 } 3226 3227 #define ext4_std_error(sb, errno) \ 3228 do { \ 3229 if ((errno)) \ 3230 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 3231 } while (0) 3232 3233 #ifdef CONFIG_SMP 3234 /* Each CPU can accumulate percpu_counter_batch clusters in their local 3235 * counters. So we need to make sure we have free clusters more 3236 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 3237 */ 3238 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 3239 #else 3240 #define EXT4_FREECLUSTERS_WATERMARK 0 3241 #endif 3242 3243 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 3244 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 3245 { 3246 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 3247 !inode_is_locked(inode)); 3248 down_write(&EXT4_I(inode)->i_data_sem); 3249 if (newsize > EXT4_I(inode)->i_disksize) 3250 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize); 3251 up_write(&EXT4_I(inode)->i_data_sem); 3252 } 3253 3254 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 3255 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 3256 { 3257 int changed = 0; 3258 3259 if (newsize > inode->i_size) { 3260 i_size_write(inode, newsize); 3261 changed = 1; 3262 } 3263 if (newsize > EXT4_I(inode)->i_disksize) { 3264 ext4_update_i_disksize(inode, newsize); 3265 changed |= 2; 3266 } 3267 return changed; 3268 } 3269 3270 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 3271 loff_t len); 3272 3273 struct ext4_group_info { 3274 unsigned long bb_state; 3275 #ifdef AGGRESSIVE_CHECK 3276 unsigned long bb_check_counter; 3277 #endif 3278 struct rb_root bb_free_root; 3279 ext4_grpblk_t bb_first_free; /* first free block */ 3280 ext4_grpblk_t bb_free; /* total free blocks */ 3281 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 3282 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 3283 struct list_head bb_prealloc_list; 3284 #ifdef DOUBLE_CHECK 3285 void *bb_bitmap; 3286 #endif 3287 struct rw_semaphore alloc_sem; 3288 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 3289 * regions, index is order. 3290 * bb_counters[3] = 5 means 3291 * 5 free 8-block regions. */ 3292 }; 3293 3294 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 3295 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 3296 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 3297 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 3298 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \ 3299 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT) 3300 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \ 3301 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT) 3302 #define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4 3303 3304 #define EXT4_MB_GRP_NEED_INIT(grp) \ 3305 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 3306 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 3307 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3308 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 3309 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3310 3311 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 3312 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3313 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 3314 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3315 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 3316 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3317 #define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \ 3318 (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state))) 3319 3320 #define EXT4_MAX_CONTENTION 8 3321 #define EXT4_CONTENTION_THRESHOLD 2 3322 3323 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 3324 ext4_group_t group) 3325 { 3326 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 3327 } 3328 3329 /* 3330 * Returns true if the filesystem is busy enough that attempts to 3331 * access the block group locks has run into contention. 3332 */ 3333 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 3334 { 3335 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 3336 } 3337 3338 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 3339 { 3340 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 3341 if (spin_trylock(lock)) 3342 /* 3343 * We're able to grab the lock right away, so drop the 3344 * lock contention counter. 3345 */ 3346 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 3347 else { 3348 /* 3349 * The lock is busy, so bump the contention counter, 3350 * and then wait on the spin lock. 3351 */ 3352 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 3353 EXT4_MAX_CONTENTION); 3354 spin_lock(lock); 3355 } 3356 } 3357 3358 static inline void ext4_unlock_group(struct super_block *sb, 3359 ext4_group_t group) 3360 { 3361 spin_unlock(ext4_group_lock_ptr(sb, group)); 3362 } 3363 3364 /* 3365 * Block validity checking 3366 */ 3367 #define ext4_check_indirect_blockref(inode, bh) \ 3368 ext4_check_blockref(__func__, __LINE__, inode, \ 3369 (__le32 *)(bh)->b_data, \ 3370 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 3371 3372 #define ext4_ind_check_inode(inode) \ 3373 ext4_check_blockref(__func__, __LINE__, inode, \ 3374 EXT4_I(inode)->i_data, \ 3375 EXT4_NDIR_BLOCKS) 3376 3377 /* 3378 * Inodes and files operations 3379 */ 3380 3381 /* dir.c */ 3382 extern const struct file_operations ext4_dir_operations; 3383 3384 #ifdef CONFIG_UNICODE 3385 extern const struct dentry_operations ext4_dentry_ops; 3386 #endif 3387 3388 /* file.c */ 3389 extern const struct inode_operations ext4_file_inode_operations; 3390 extern const struct file_operations ext4_file_operations; 3391 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 3392 3393 /* inline.c */ 3394 extern int ext4_get_max_inline_size(struct inode *inode); 3395 extern int ext4_find_inline_data_nolock(struct inode *inode); 3396 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 3397 unsigned int len); 3398 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 3399 3400 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 3401 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 3402 struct inode *inode, 3403 loff_t pos, unsigned len, 3404 unsigned flags, 3405 struct page **pagep); 3406 extern int ext4_write_inline_data_end(struct inode *inode, 3407 loff_t pos, unsigned len, 3408 unsigned copied, 3409 struct page *page); 3410 extern struct buffer_head * 3411 ext4_journalled_write_inline_data(struct inode *inode, 3412 unsigned len, 3413 struct page *page); 3414 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 3415 struct inode *inode, 3416 loff_t pos, unsigned len, 3417 unsigned flags, 3418 struct page **pagep, 3419 void **fsdata); 3420 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 3421 unsigned len, unsigned copied, 3422 struct page *page); 3423 extern int ext4_try_add_inline_entry(handle_t *handle, 3424 struct ext4_filename *fname, 3425 struct inode *dir, struct inode *inode); 3426 extern int ext4_try_create_inline_dir(handle_t *handle, 3427 struct inode *parent, 3428 struct inode *inode); 3429 extern int ext4_read_inline_dir(struct file *filp, 3430 struct dir_context *ctx, 3431 int *has_inline_data); 3432 extern int ext4_inlinedir_to_tree(struct file *dir_file, 3433 struct inode *dir, ext4_lblk_t block, 3434 struct dx_hash_info *hinfo, 3435 __u32 start_hash, __u32 start_minor_hash, 3436 int *has_inline_data); 3437 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3438 struct ext4_filename *fname, 3439 struct ext4_dir_entry_2 **res_dir, 3440 int *has_inline_data); 3441 extern int ext4_delete_inline_entry(handle_t *handle, 3442 struct inode *dir, 3443 struct ext4_dir_entry_2 *de_del, 3444 struct buffer_head *bh, 3445 int *has_inline_data); 3446 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); 3447 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3448 struct ext4_dir_entry_2 **parent_de, 3449 int *retval); 3450 extern int ext4_inline_data_fiemap(struct inode *inode, 3451 struct fiemap_extent_info *fieinfo, 3452 int *has_inline, __u64 start, __u64 len); 3453 3454 struct iomap; 3455 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap); 3456 3457 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3458 3459 extern int ext4_convert_inline_data(struct inode *inode); 3460 3461 static inline int ext4_has_inline_data(struct inode *inode) 3462 { 3463 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3464 EXT4_I(inode)->i_inline_off; 3465 } 3466 3467 /* namei.c */ 3468 extern const struct inode_operations ext4_dir_inode_operations; 3469 extern const struct inode_operations ext4_special_inode_operations; 3470 extern struct dentry *ext4_get_parent(struct dentry *child); 3471 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3472 struct ext4_dir_entry_2 *de, 3473 int blocksize, int csum_size, 3474 unsigned int parent_ino, int dotdot_real_len); 3475 extern void ext4_initialize_dirent_tail(struct buffer_head *bh, 3476 unsigned int blocksize); 3477 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode, 3478 struct buffer_head *bh); 3479 extern int ext4_ci_compare(const struct inode *parent, 3480 const struct qstr *fname, 3481 const struct qstr *entry, bool quick); 3482 extern int __ext4_unlink(handle_t *handle, struct inode *dir, const struct qstr *d_name, 3483 struct inode *inode); 3484 extern int __ext4_link(struct inode *dir, struct inode *inode, 3485 struct dentry *dentry); 3486 3487 #define S_SHIFT 12 3488 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = { 3489 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3490 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3491 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3492 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3493 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3494 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3495 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3496 }; 3497 3498 static inline void ext4_set_de_type(struct super_block *sb, 3499 struct ext4_dir_entry_2 *de, 3500 umode_t mode) { 3501 if (ext4_has_feature_filetype(sb)) 3502 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3503 } 3504 3505 /* readpages.c */ 3506 extern int ext4_mpage_readpages(struct inode *inode, 3507 struct readahead_control *rac, struct page *page); 3508 extern int __init ext4_init_post_read_processing(void); 3509 extern void ext4_exit_post_read_processing(void); 3510 3511 /* symlink.c */ 3512 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3513 extern const struct inode_operations ext4_symlink_inode_operations; 3514 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3515 3516 /* sysfs.c */ 3517 extern int ext4_register_sysfs(struct super_block *sb); 3518 extern void ext4_unregister_sysfs(struct super_block *sb); 3519 extern int __init ext4_init_sysfs(void); 3520 extern void ext4_exit_sysfs(void); 3521 3522 /* block_validity */ 3523 extern void ext4_release_system_zone(struct super_block *sb); 3524 extern int ext4_setup_system_zone(struct super_block *sb); 3525 extern int __init ext4_init_system_zone(void); 3526 extern void ext4_exit_system_zone(void); 3527 extern int ext4_inode_block_valid(struct inode *inode, 3528 ext4_fsblk_t start_blk, 3529 unsigned int count); 3530 extern int ext4_check_blockref(const char *, unsigned int, 3531 struct inode *, __le32 *, unsigned int); 3532 3533 /* extents.c */ 3534 struct ext4_ext_path; 3535 struct ext4_extent; 3536 3537 /* 3538 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3539 * __le32. 3540 */ 3541 #define EXT_MAX_BLOCKS 0xffffffff 3542 3543 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode); 3544 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3545 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3546 struct ext4_map_blocks *map, int flags); 3547 extern int ext4_ext_truncate(handle_t *, struct inode *); 3548 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3549 ext4_lblk_t end); 3550 extern void ext4_ext_init(struct super_block *); 3551 extern void ext4_ext_release(struct super_block *); 3552 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3553 loff_t len); 3554 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3555 loff_t offset, ssize_t len); 3556 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle, 3557 ext4_io_end_t *io_end); 3558 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3559 struct ext4_map_blocks *map, int flags); 3560 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3561 int num, 3562 struct ext4_ext_path *path); 3563 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3564 struct ext4_ext_path **, 3565 struct ext4_extent *, int); 3566 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3567 struct ext4_ext_path **, 3568 int flags); 3569 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 3570 extern int ext4_ext_check_inode(struct inode *inode); 3571 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3572 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3573 __u64 start, __u64 len); 3574 extern int ext4_get_es_cache(struct inode *inode, 3575 struct fiemap_extent_info *fieinfo, 3576 __u64 start, __u64 len); 3577 extern int ext4_ext_precache(struct inode *inode); 3578 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3579 struct inode *inode2, ext4_lblk_t lblk1, 3580 ext4_lblk_t lblk2, ext4_lblk_t count, 3581 int mark_unwritten,int *err); 3582 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu); 3583 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode, 3584 int check_cred, int restart_cred, 3585 int revoke_cred); 3586 extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end); 3587 extern int ext4_ext_replay_set_iblocks(struct inode *inode); 3588 extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start, 3589 int len, int unwritten, ext4_fsblk_t pblk); 3590 extern int ext4_ext_clear_bb(struct inode *inode); 3591 3592 3593 /* move_extent.c */ 3594 extern void ext4_double_down_write_data_sem(struct inode *first, 3595 struct inode *second); 3596 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3597 struct inode *donor_inode); 3598 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3599 __u64 start_orig, __u64 start_donor, 3600 __u64 len, __u64 *moved_len); 3601 3602 /* page-io.c */ 3603 extern int __init ext4_init_pageio(void); 3604 extern void ext4_exit_pageio(void); 3605 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3606 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3607 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3608 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3609 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3610 struct writeback_control *wbc); 3611 extern void ext4_end_io_rsv_work(struct work_struct *work); 3612 extern void ext4_io_submit(struct ext4_io_submit *io); 3613 extern int ext4_bio_write_page(struct ext4_io_submit *io, 3614 struct page *page, 3615 int len, 3616 struct writeback_control *wbc, 3617 bool keep_towrite); 3618 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end); 3619 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end); 3620 3621 /* mmp.c */ 3622 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3623 3624 /* verity.c */ 3625 extern const struct fsverity_operations ext4_verityops; 3626 3627 /* 3628 * Add new method to test whether block and inode bitmaps are properly 3629 * initialized. With uninit_bg reading the block from disk is not enough 3630 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3631 */ 3632 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3633 3634 static inline int bitmap_uptodate(struct buffer_head *bh) 3635 { 3636 return (buffer_uptodate(bh) && 3637 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3638 } 3639 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3640 { 3641 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3642 } 3643 3644 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3645 3646 /* For ioend & aio unwritten conversion wait queues */ 3647 #define EXT4_WQ_HASH_SZ 37 3648 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3649 EXT4_WQ_HASH_SZ]) 3650 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3651 3652 extern int ext4_resize_begin(struct super_block *sb); 3653 extern void ext4_resize_end(struct super_block *sb); 3654 3655 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 3656 struct ext4_io_end *io_end) 3657 { 3658 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 3659 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3660 atomic_inc(&EXT4_I(inode)->i_unwritten); 3661 } 3662 } 3663 3664 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3665 { 3666 struct inode *inode = io_end->inode; 3667 3668 if (io_end->flag & EXT4_IO_END_UNWRITTEN) { 3669 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3670 /* Wake up anyone waiting on unwritten extent conversion */ 3671 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) 3672 wake_up_all(ext4_ioend_wq(inode)); 3673 } 3674 } 3675 3676 extern const struct iomap_ops ext4_iomap_ops; 3677 extern const struct iomap_ops ext4_iomap_overwrite_ops; 3678 extern const struct iomap_ops ext4_iomap_report_ops; 3679 3680 static inline int ext4_buffer_uptodate(struct buffer_head *bh) 3681 { 3682 /* 3683 * If the buffer has the write error flag, we have failed 3684 * to write out data in the block. In this case, we don't 3685 * have to read the block because we may read the old data 3686 * successfully. 3687 */ 3688 if (!buffer_uptodate(bh) && buffer_write_io_error(bh)) 3689 set_buffer_uptodate(bh); 3690 return buffer_uptodate(bh); 3691 } 3692 3693 #endif /* __KERNEL__ */ 3694 3695 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3696 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3697 3698 #endif /* _EXT4_H */ 3699