1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * ext4.h 4 * 5 * Copyright (C) 1992, 1993, 1994, 1995 6 * Remy Card (card@masi.ibp.fr) 7 * Laboratoire MASI - Institut Blaise Pascal 8 * Universite Pierre et Marie Curie (Paris VI) 9 * 10 * from 11 * 12 * linux/include/linux/minix_fs.h 13 * 14 * Copyright (C) 1991, 1992 Linus Torvalds 15 */ 16 17 #ifndef _EXT4_H 18 #define _EXT4_H 19 20 #include <linux/types.h> 21 #include <linux/blkdev.h> 22 #include <linux/magic.h> 23 #include <linux/jbd2.h> 24 #include <linux/quota.h> 25 #include <linux/rwsem.h> 26 #include <linux/rbtree.h> 27 #include <linux/seqlock.h> 28 #include <linux/mutex.h> 29 #include <linux/timer.h> 30 #include <linux/version.h> 31 #include <linux/wait.h> 32 #include <linux/sched/signal.h> 33 #include <linux/blockgroup_lock.h> 34 #include <linux/percpu_counter.h> 35 #include <linux/ratelimit.h> 36 #include <crypto/hash.h> 37 #include <linux/falloc.h> 38 #include <linux/percpu-rwsem.h> 39 #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 get lots of info about extents operations. 85 */ 86 #define EXT_DEBUG__ 87 #ifdef EXT_DEBUG 88 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__) 89 #else 90 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 91 #endif 92 93 /* data type for block offset of block group */ 94 typedef int ext4_grpblk_t; 95 96 /* data type for filesystem-wide blocks number */ 97 typedef unsigned long long ext4_fsblk_t; 98 99 /* data type for file logical block number */ 100 typedef __u32 ext4_lblk_t; 101 102 /* data type for block group number */ 103 typedef unsigned int ext4_group_t; 104 105 enum SHIFT_DIRECTION { 106 SHIFT_LEFT = 0, 107 SHIFT_RIGHT, 108 }; 109 110 /* 111 * Flags used in mballoc's allocation_context flags field. 112 * 113 * Also used to show what's going on for debugging purposes when the 114 * flag field is exported via the traceport interface 115 */ 116 117 /* prefer goal again. length */ 118 #define EXT4_MB_HINT_MERGE 0x0001 119 /* blocks already reserved */ 120 #define EXT4_MB_HINT_RESERVED 0x0002 121 /* metadata is being allocated */ 122 #define EXT4_MB_HINT_METADATA 0x0004 123 /* first blocks in the file */ 124 #define EXT4_MB_HINT_FIRST 0x0008 125 /* search for the best chunk */ 126 #define EXT4_MB_HINT_BEST 0x0010 127 /* data is being allocated */ 128 #define EXT4_MB_HINT_DATA 0x0020 129 /* don't preallocate (for tails) */ 130 #define EXT4_MB_HINT_NOPREALLOC 0x0040 131 /* allocate for locality group */ 132 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 133 /* allocate goal blocks or none */ 134 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 135 /* goal is meaningful */ 136 #define EXT4_MB_HINT_TRY_GOAL 0x0200 137 /* blocks already pre-reserved by delayed allocation */ 138 #define EXT4_MB_DELALLOC_RESERVED 0x0400 139 /* We are doing stream allocation */ 140 #define EXT4_MB_STREAM_ALLOC 0x0800 141 /* Use reserved root blocks if needed */ 142 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 143 /* Use blocks from reserved pool */ 144 #define EXT4_MB_USE_RESERVED 0x2000 145 146 struct ext4_allocation_request { 147 /* target inode for block we're allocating */ 148 struct inode *inode; 149 /* how many blocks we want to allocate */ 150 unsigned int len; 151 /* logical block in target inode */ 152 ext4_lblk_t logical; 153 /* the closest logical allocated block to the left */ 154 ext4_lblk_t lleft; 155 /* the closest logical allocated block to the right */ 156 ext4_lblk_t lright; 157 /* phys. target (a hint) */ 158 ext4_fsblk_t goal; 159 /* phys. block for the closest logical allocated block to the left */ 160 ext4_fsblk_t pleft; 161 /* phys. block for the closest logical allocated block to the right */ 162 ext4_fsblk_t pright; 163 /* flags. see above EXT4_MB_HINT_* */ 164 unsigned int flags; 165 }; 166 167 /* 168 * Logical to physical block mapping, used by ext4_map_blocks() 169 * 170 * This structure is used to pass requests into ext4_map_blocks() as 171 * well as to store the information returned by ext4_map_blocks(). It 172 * takes less room on the stack than a struct buffer_head. 173 */ 174 #define EXT4_MAP_NEW (1 << BH_New) 175 #define EXT4_MAP_MAPPED (1 << BH_Mapped) 176 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 177 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 178 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 179 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 180 181 struct ext4_map_blocks { 182 ext4_fsblk_t m_pblk; 183 ext4_lblk_t m_lblk; 184 unsigned int m_len; 185 unsigned int m_flags; 186 }; 187 188 /* 189 * Block validity checking, system zone rbtree. 190 */ 191 struct ext4_system_blocks { 192 struct rb_root root; 193 struct rcu_head rcu; 194 }; 195 196 /* 197 * Flags for ext4_io_end->flags 198 */ 199 #define EXT4_IO_END_UNWRITTEN 0x0001 200 201 struct ext4_io_end_vec { 202 struct list_head list; /* list of io_end_vec */ 203 loff_t offset; /* offset in the file */ 204 ssize_t size; /* size of the extent */ 205 }; 206 207 /* 208 * For converting unwritten extents on a work queue. 'handle' is used for 209 * buffered writeback. 210 */ 211 typedef struct ext4_io_end { 212 struct list_head list; /* per-file finished IO list */ 213 handle_t *handle; /* handle reserved for extent 214 * conversion */ 215 struct inode *inode; /* file being written to */ 216 struct bio *bio; /* Linked list of completed 217 * bios covering the extent */ 218 unsigned int flag; /* unwritten or not */ 219 atomic_t count; /* reference counter */ 220 struct list_head list_vec; /* list of ext4_io_end_vec */ 221 } ext4_io_end_t; 222 223 struct ext4_io_submit { 224 struct writeback_control *io_wbc; 225 struct bio *io_bio; 226 ext4_io_end_t *io_end; 227 sector_t io_next_block; 228 }; 229 230 /* 231 * Special inodes numbers 232 */ 233 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 234 #define EXT4_ROOT_INO 2 /* Root inode */ 235 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 236 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 237 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 238 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 239 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 240 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 241 242 /* First non-reserved inode for old ext4 filesystems */ 243 #define EXT4_GOOD_OLD_FIRST_INO 11 244 245 /* 246 * Maximal count of links to a file 247 */ 248 #define EXT4_LINK_MAX 65000 249 250 /* 251 * Macro-instructions used to manage several block sizes 252 */ 253 #define EXT4_MIN_BLOCK_SIZE 1024 254 #define EXT4_MAX_BLOCK_SIZE 65536 255 #define EXT4_MIN_BLOCK_LOG_SIZE 10 256 #define EXT4_MAX_BLOCK_LOG_SIZE 16 257 #define EXT4_MAX_CLUSTER_LOG_SIZE 30 258 #ifdef __KERNEL__ 259 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 260 #else 261 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 262 #endif 263 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 264 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 265 EXT4_SB(s)->s_cluster_bits) 266 #ifdef __KERNEL__ 267 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 268 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 269 #else 270 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 271 #endif 272 #ifdef __KERNEL__ 273 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 274 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 275 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 276 #else 277 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 278 EXT4_GOOD_OLD_INODE_SIZE : \ 279 (s)->s_inode_size) 280 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 281 EXT4_GOOD_OLD_FIRST_INO : \ 282 (s)->s_first_ino) 283 #endif 284 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 285 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \ 286 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \ 287 blkbits)) 288 289 /* Translate a block number to a cluster number */ 290 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 291 /* Translate a cluster number to a block number */ 292 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 293 /* Translate # of blks to # of clusters */ 294 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 295 (sbi)->s_cluster_bits) 296 /* Mask out the low bits to get the starting block of the cluster */ 297 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 298 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 299 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 300 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 301 /* Fill in the low bits to get the last block of the cluster */ 302 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \ 303 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1)) 304 /* Get the cluster offset */ 305 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 306 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 307 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 308 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 309 310 /* 311 * Structure of a blocks group descriptor 312 */ 313 struct ext4_group_desc 314 { 315 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 316 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 317 __le32 bg_inode_table_lo; /* Inodes table block */ 318 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 319 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 320 __le16 bg_used_dirs_count_lo; /* Directories count */ 321 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 322 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 323 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 324 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 325 __le16 bg_itable_unused_lo; /* Unused inodes count */ 326 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 327 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 328 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 329 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 330 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 331 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 332 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 333 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 334 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 335 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 336 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 337 __u32 bg_reserved; 338 }; 339 340 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 341 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 342 sizeof(__le16)) 343 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 344 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 345 sizeof(__le16)) 346 347 /* 348 * Structure of a flex block group info 349 */ 350 351 struct flex_groups { 352 atomic64_t free_clusters; 353 atomic_t free_inodes; 354 atomic_t used_dirs; 355 }; 356 357 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 358 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 359 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 360 361 /* 362 * Macro-instructions used to manage group descriptors 363 */ 364 #define EXT4_MIN_DESC_SIZE 32 365 #define EXT4_MIN_DESC_SIZE_64BIT 64 366 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 367 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 368 #ifdef __KERNEL__ 369 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 370 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 371 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 372 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 373 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 374 #else 375 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 376 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 377 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 378 #endif 379 380 /* 381 * Constants relative to the data blocks 382 */ 383 #define EXT4_NDIR_BLOCKS 12 384 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 385 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 386 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 387 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 388 389 /* 390 * Inode flags 391 */ 392 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 393 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 394 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 395 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 396 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 397 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 398 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 399 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 400 /* Reserved for compression usage... */ 401 #define EXT4_DIRTY_FL 0x00000100 402 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 403 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 404 /* nb: was previously EXT2_ECOMPR_FL */ 405 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 406 /* End compression flags --- maybe not all used */ 407 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 408 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 409 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 410 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 411 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 412 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 413 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 414 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 415 #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */ 416 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 417 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */ 418 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 419 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 420 #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded file */ 421 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 422 423 #define EXT4_FL_USER_VISIBLE 0x705BDFFF /* User visible flags */ 424 #define EXT4_FL_USER_MODIFIABLE 0x604BC0FF /* User modifiable flags */ 425 426 /* Flags we can manipulate with through EXT4_IOC_FSSETXATTR */ 427 #define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \ 428 EXT4_IMMUTABLE_FL | \ 429 EXT4_APPEND_FL | \ 430 EXT4_NODUMP_FL | \ 431 EXT4_NOATIME_FL | \ 432 EXT4_PROJINHERIT_FL) 433 434 /* Flags that should be inherited by new inodes from their parent. */ 435 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 436 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 437 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 438 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 439 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL) 440 441 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 442 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\ 443 EXT4_PROJINHERIT_FL)) 444 445 /* Flags that are appropriate for non-directories/regular files. */ 446 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 447 448 /* The only flags that should be swapped */ 449 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL) 450 451 /* Mask out flags that are inappropriate for the given type of inode. */ 452 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 453 { 454 if (S_ISDIR(mode)) 455 return flags; 456 else if (S_ISREG(mode)) 457 return flags & EXT4_REG_FLMASK; 458 else 459 return flags & EXT4_OTHER_FLMASK; 460 } 461 462 /* 463 * Inode flags used for atomic set/get 464 */ 465 enum { 466 EXT4_INODE_SECRM = 0, /* Secure deletion */ 467 EXT4_INODE_UNRM = 1, /* Undelete */ 468 EXT4_INODE_COMPR = 2, /* Compress file */ 469 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 470 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 471 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 472 EXT4_INODE_NODUMP = 6, /* do not dump file */ 473 EXT4_INODE_NOATIME = 7, /* do not update atime */ 474 /* Reserved for compression usage... */ 475 EXT4_INODE_DIRTY = 8, 476 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 477 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 478 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 479 /* End compression flags --- maybe not all used */ 480 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 481 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 482 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 483 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 484 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 485 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 486 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 487 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 488 EXT4_INODE_VERITY = 20, /* Verity protected inode */ 489 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 490 /* 22 was formerly EXT4_INODE_EOFBLOCKS */ 491 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 492 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 493 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 494 }; 495 496 /* 497 * Since it's pretty easy to mix up bit numbers and hex values, we use a 498 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 499 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 500 * any extra space in the compiled kernel image, otherwise, the build will fail. 501 * It's important that these values are the same, since we are using 502 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 503 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 504 * values found in ext2, ext3 and ext4 filesystems, and of course the values 505 * defined in e2fsprogs. 506 * 507 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 508 */ 509 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 510 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 511 512 static inline void ext4_check_flag_values(void) 513 { 514 CHECK_FLAG_VALUE(SECRM); 515 CHECK_FLAG_VALUE(UNRM); 516 CHECK_FLAG_VALUE(COMPR); 517 CHECK_FLAG_VALUE(SYNC); 518 CHECK_FLAG_VALUE(IMMUTABLE); 519 CHECK_FLAG_VALUE(APPEND); 520 CHECK_FLAG_VALUE(NODUMP); 521 CHECK_FLAG_VALUE(NOATIME); 522 CHECK_FLAG_VALUE(DIRTY); 523 CHECK_FLAG_VALUE(COMPRBLK); 524 CHECK_FLAG_VALUE(NOCOMPR); 525 CHECK_FLAG_VALUE(ENCRYPT); 526 CHECK_FLAG_VALUE(INDEX); 527 CHECK_FLAG_VALUE(IMAGIC); 528 CHECK_FLAG_VALUE(JOURNAL_DATA); 529 CHECK_FLAG_VALUE(NOTAIL); 530 CHECK_FLAG_VALUE(DIRSYNC); 531 CHECK_FLAG_VALUE(TOPDIR); 532 CHECK_FLAG_VALUE(HUGE_FILE); 533 CHECK_FLAG_VALUE(EXTENTS); 534 CHECK_FLAG_VALUE(VERITY); 535 CHECK_FLAG_VALUE(EA_INODE); 536 CHECK_FLAG_VALUE(INLINE_DATA); 537 CHECK_FLAG_VALUE(PROJINHERIT); 538 CHECK_FLAG_VALUE(RESERVED); 539 } 540 541 /* Used to pass group descriptor data when online resize is done */ 542 struct ext4_new_group_input { 543 __u32 group; /* Group number for this data */ 544 __u64 block_bitmap; /* Absolute block number of block bitmap */ 545 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 546 __u64 inode_table; /* Absolute block number of inode table start */ 547 __u32 blocks_count; /* Total number of blocks in this group */ 548 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 549 __u16 unused; 550 }; 551 552 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 553 struct compat_ext4_new_group_input { 554 u32 group; 555 compat_u64 block_bitmap; 556 compat_u64 inode_bitmap; 557 compat_u64 inode_table; 558 u32 blocks_count; 559 u16 reserved_blocks; 560 u16 unused; 561 }; 562 #endif 563 564 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 565 struct ext4_new_group_data { 566 __u32 group; 567 __u64 block_bitmap; 568 __u64 inode_bitmap; 569 __u64 inode_table; 570 __u32 blocks_count; 571 __u16 reserved_blocks; 572 __u16 mdata_blocks; 573 __u32 free_clusters_count; 574 }; 575 576 /* Indexes used to index group tables in ext4_new_group_data */ 577 enum { 578 BLOCK_BITMAP = 0, /* block bitmap */ 579 INODE_BITMAP, /* inode bitmap */ 580 INODE_TABLE, /* inode tables */ 581 GROUP_TABLE_COUNT, 582 }; 583 584 /* 585 * Flags used by ext4_map_blocks() 586 */ 587 /* Allocate any needed blocks and/or convert an unwritten 588 extent to be an initialized ext4 */ 589 #define EXT4_GET_BLOCKS_CREATE 0x0001 590 /* Request the creation of an unwritten extent */ 591 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 592 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 593 EXT4_GET_BLOCKS_CREATE) 594 /* Caller is from the delayed allocation writeout path 595 * finally doing the actual allocation of delayed blocks */ 596 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 597 /* caller is from the direct IO path, request to creation of an 598 unwritten extents if not allocated, split the unwritten 599 extent if blocks has been preallocated already*/ 600 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 601 #define EXT4_GET_BLOCKS_CONVERT 0x0010 602 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 603 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 604 /* Convert extent to initialized after IO complete */ 605 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 606 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 607 /* Eventual metadata allocation (due to growing extent tree) 608 * should not fail, so try to use reserved blocks for that.*/ 609 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 610 /* Don't normalize allocation size (used for fallocate) */ 611 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 612 /* Request will not result in inode size update (user for fallocate) */ 613 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 614 /* Convert written extents to unwritten */ 615 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 616 /* Write zeros to newly created written extents */ 617 #define EXT4_GET_BLOCKS_ZERO 0x0200 618 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 619 EXT4_GET_BLOCKS_ZERO) 620 /* Caller will submit data before dropping transaction handle. This 621 * allows jbd2 to avoid submitting data before commit. */ 622 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 623 624 /* 625 * The bit position of these flags must not overlap with any of the 626 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 627 * read_extent_tree_block(), ext4_split_extent_at(), 628 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 629 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 630 * caching the extents when reading from the extent tree while a 631 * truncate or punch hole operation is in progress. 632 */ 633 #define EXT4_EX_NOCACHE 0x40000000 634 #define EXT4_EX_FORCE_CACHE 0x20000000 635 636 /* 637 * Flags used by ext4_free_blocks 638 */ 639 #define EXT4_FREE_BLOCKS_METADATA 0x0001 640 #define EXT4_FREE_BLOCKS_FORGET 0x0002 641 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 642 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 643 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 644 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 645 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040 646 647 /* 648 * ioctl commands 649 */ 650 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 651 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 652 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 653 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 654 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 655 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 656 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 657 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 658 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 659 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 660 #define EXT4_IOC_MIGRATE _IO('f', 9) 661 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 662 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 663 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 664 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 665 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 666 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 667 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 668 #define EXT4_IOC_SET_ENCRYPTION_POLICY FS_IOC_SET_ENCRYPTION_POLICY 669 #define EXT4_IOC_GET_ENCRYPTION_PWSALT FS_IOC_GET_ENCRYPTION_PWSALT 670 #define EXT4_IOC_GET_ENCRYPTION_POLICY FS_IOC_GET_ENCRYPTION_POLICY 671 /* ioctl codes 19--39 are reserved for fscrypt */ 672 #define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40) 673 #define EXT4_IOC_GETSTATE _IOW('f', 41, __u32) 674 #define EXT4_IOC_GET_ES_CACHE _IOWR('f', 42, struct fiemap) 675 676 #define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR 677 #define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR 678 679 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32) 680 681 /* 682 * Flags for going down operation 683 */ 684 #define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */ 685 #define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */ 686 #define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */ 687 688 /* 689 * Flags returned by EXT4_IOC_GETSTATE 690 * 691 * We only expose to userspace a subset of the state flags in 692 * i_state_flags 693 */ 694 #define EXT4_STATE_FLAG_EXT_PRECACHED 0x00000001 695 #define EXT4_STATE_FLAG_NEW 0x00000002 696 #define EXT4_STATE_FLAG_NEWENTRY 0x00000004 697 #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE 0x00000008 698 699 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 700 /* 701 * ioctl commands in 32 bit emulation 702 */ 703 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 704 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 705 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 706 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 707 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 708 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 709 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 710 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 711 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 712 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 713 #endif 714 715 /* 716 * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag. 717 * It indicates that the entry in extent status cache is for a hole. 718 */ 719 #define EXT4_FIEMAP_EXTENT_HOLE 0x08000000 720 721 /* Max physical block we can address w/o extents */ 722 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 723 724 /* Max logical block we can support */ 725 #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE 726 727 /* 728 * Structure of an inode on the disk 729 */ 730 struct ext4_inode { 731 __le16 i_mode; /* File mode */ 732 __le16 i_uid; /* Low 16 bits of Owner Uid */ 733 __le32 i_size_lo; /* Size in bytes */ 734 __le32 i_atime; /* Access time */ 735 __le32 i_ctime; /* Inode Change time */ 736 __le32 i_mtime; /* Modification time */ 737 __le32 i_dtime; /* Deletion Time */ 738 __le16 i_gid; /* Low 16 bits of Group Id */ 739 __le16 i_links_count; /* Links count */ 740 __le32 i_blocks_lo; /* Blocks count */ 741 __le32 i_flags; /* File flags */ 742 union { 743 struct { 744 __le32 l_i_version; 745 } linux1; 746 struct { 747 __u32 h_i_translator; 748 } hurd1; 749 struct { 750 __u32 m_i_reserved1; 751 } masix1; 752 } osd1; /* OS dependent 1 */ 753 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 754 __le32 i_generation; /* File version (for NFS) */ 755 __le32 i_file_acl_lo; /* File ACL */ 756 __le32 i_size_high; 757 __le32 i_obso_faddr; /* Obsoleted fragment address */ 758 union { 759 struct { 760 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 761 __le16 l_i_file_acl_high; 762 __le16 l_i_uid_high; /* these 2 fields */ 763 __le16 l_i_gid_high; /* were reserved2[0] */ 764 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 765 __le16 l_i_reserved; 766 } linux2; 767 struct { 768 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 769 __u16 h_i_mode_high; 770 __u16 h_i_uid_high; 771 __u16 h_i_gid_high; 772 __u32 h_i_author; 773 } hurd2; 774 struct { 775 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 776 __le16 m_i_file_acl_high; 777 __u32 m_i_reserved2[2]; 778 } masix2; 779 } osd2; /* OS dependent 2 */ 780 __le16 i_extra_isize; 781 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 782 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 783 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 784 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 785 __le32 i_crtime; /* File Creation time */ 786 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 787 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 788 __le32 i_projid; /* Project ID */ 789 }; 790 791 struct move_extent { 792 __u32 reserved; /* should be zero */ 793 __u32 donor_fd; /* donor file descriptor */ 794 __u64 orig_start; /* logical start offset in block for orig */ 795 __u64 donor_start; /* logical start offset in block for donor */ 796 __u64 len; /* block length to be moved */ 797 __u64 moved_len; /* moved block length */ 798 }; 799 800 #define EXT4_EPOCH_BITS 2 801 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 802 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 803 804 /* 805 * Extended fields will fit into an inode if the filesystem was formatted 806 * with large inodes (-I 256 or larger) and there are not currently any EAs 807 * consuming all of the available space. For new inodes we always reserve 808 * enough space for the kernel's known extended fields, but for inodes 809 * created with an old kernel this might not have been the case. None of 810 * the extended inode fields is critical for correct filesystem operation. 811 * This macro checks if a certain field fits in the inode. Note that 812 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 813 */ 814 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 815 ((offsetof(typeof(*ext4_inode), field) + \ 816 sizeof((ext4_inode)->field)) \ 817 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 818 (einode)->i_extra_isize)) \ 819 820 /* 821 * We use an encoding that preserves the times for extra epoch "00": 822 * 823 * extra msb of adjust for signed 824 * epoch 32-bit 32-bit tv_sec to 825 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 826 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 827 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 828 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 829 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 830 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 831 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 832 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 833 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 834 * 835 * Note that previous versions of the kernel on 64-bit systems would 836 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 837 * 1970. e2fsck will correct this, assuming that it is run on the 838 * affected filesystem before 2242. 839 */ 840 841 static inline __le32 ext4_encode_extra_time(struct timespec64 *time) 842 { 843 u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK; 844 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); 845 } 846 847 static inline void ext4_decode_extra_time(struct timespec64 *time, 848 __le32 extra) 849 { 850 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) 851 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 852 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 853 } 854 855 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 856 do { \ 857 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\ 858 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 859 (raw_inode)->xtime ## _extra = \ 860 ext4_encode_extra_time(&(inode)->xtime); \ 861 } \ 862 else \ 863 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX)); \ 864 } while (0) 865 866 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 867 do { \ 868 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 869 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 870 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 871 (raw_inode)->xtime ## _extra = \ 872 ext4_encode_extra_time(&(einode)->xtime); \ 873 } while (0) 874 875 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 876 do { \ 877 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 878 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \ 879 ext4_decode_extra_time(&(inode)->xtime, \ 880 raw_inode->xtime ## _extra); \ 881 } \ 882 else \ 883 (inode)->xtime.tv_nsec = 0; \ 884 } while (0) 885 886 887 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 888 do { \ 889 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 890 (einode)->xtime.tv_sec = \ 891 (signed)le32_to_cpu((raw_inode)->xtime); \ 892 else \ 893 (einode)->xtime.tv_sec = 0; \ 894 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 895 ext4_decode_extra_time(&(einode)->xtime, \ 896 raw_inode->xtime ## _extra); \ 897 else \ 898 (einode)->xtime.tv_nsec = 0; \ 899 } while (0) 900 901 #define i_disk_version osd1.linux1.l_i_version 902 903 #if defined(__KERNEL__) || defined(__linux__) 904 #define i_reserved1 osd1.linux1.l_i_reserved1 905 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 906 #define i_blocks_high osd2.linux2.l_i_blocks_high 907 #define i_uid_low i_uid 908 #define i_gid_low i_gid 909 #define i_uid_high osd2.linux2.l_i_uid_high 910 #define i_gid_high osd2.linux2.l_i_gid_high 911 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 912 913 #elif defined(__GNU__) 914 915 #define i_translator osd1.hurd1.h_i_translator 916 #define i_uid_high osd2.hurd2.h_i_uid_high 917 #define i_gid_high osd2.hurd2.h_i_gid_high 918 #define i_author osd2.hurd2.h_i_author 919 920 #elif defined(__masix__) 921 922 #define i_reserved1 osd1.masix1.m_i_reserved1 923 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 924 #define i_reserved2 osd2.masix2.m_i_reserved2 925 926 #endif /* defined(__KERNEL__) || defined(__linux__) */ 927 928 #include "extents_status.h" 929 930 /* 931 * Lock subclasses for i_data_sem in the ext4_inode_info structure. 932 * 933 * These are needed to avoid lockdep false positives when we need to 934 * allocate blocks to the quota inode during ext4_map_blocks(), while 935 * holding i_data_sem for a normal (non-quota) inode. Since we don't 936 * do quota tracking for the quota inode, this avoids deadlock (as 937 * well as infinite recursion, since it isn't turtles all the way 938 * down...) 939 * 940 * I_DATA_SEM_NORMAL - Used for most inodes 941 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode 942 * where the second inode has larger inode number 943 * than the first 944 * I_DATA_SEM_QUOTA - Used for quota inodes only 945 */ 946 enum { 947 I_DATA_SEM_NORMAL = 0, 948 I_DATA_SEM_OTHER, 949 I_DATA_SEM_QUOTA, 950 }; 951 952 953 /* 954 * fourth extended file system inode data in memory 955 */ 956 struct ext4_inode_info { 957 __le32 i_data[15]; /* unconverted */ 958 __u32 i_dtime; 959 ext4_fsblk_t i_file_acl; 960 961 /* 962 * i_block_group is the number of the block group which contains 963 * this file's inode. Constant across the lifetime of the inode, 964 * it is used for making block allocation decisions - we try to 965 * place a file's data blocks near its inode block, and new inodes 966 * near to their parent directory's inode. 967 */ 968 ext4_group_t i_block_group; 969 ext4_lblk_t i_dir_start_lookup; 970 #if (BITS_PER_LONG < 64) 971 unsigned long i_state_flags; /* Dynamic state flags */ 972 #endif 973 unsigned long i_flags; 974 975 /* 976 * Extended attributes can be read independently of the main file 977 * data. Taking i_mutex even when reading would cause contention 978 * between readers of EAs and writers of regular file data, so 979 * instead we synchronize on xattr_sem when reading or changing 980 * EAs. 981 */ 982 struct rw_semaphore xattr_sem; 983 984 struct list_head i_orphan; /* unlinked but open inodes */ 985 986 /* 987 * i_disksize keeps track of what the inode size is ON DISK, not 988 * in memory. During truncate, i_size is set to the new size by 989 * the VFS prior to calling ext4_truncate(), but the filesystem won't 990 * set i_disksize to 0 until the truncate is actually under way. 991 * 992 * The intent is that i_disksize always represents the blocks which 993 * are used by this file. This allows recovery to restart truncate 994 * on orphans if we crash during truncate. We actually write i_disksize 995 * into the on-disk inode when writing inodes out, instead of i_size. 996 * 997 * The only time when i_disksize and i_size may be different is when 998 * a truncate is in progress. The only things which change i_disksize 999 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 1000 */ 1001 loff_t i_disksize; 1002 1003 /* 1004 * i_data_sem is for serialising ext4_truncate() against 1005 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 1006 * data tree are chopped off during truncate. We can't do that in 1007 * ext4 because whenever we perform intermediate commits during 1008 * truncate, the inode and all the metadata blocks *must* be in a 1009 * consistent state which allows truncation of the orphans to restart 1010 * during recovery. Hence we must fix the get_block-vs-truncate race 1011 * by other means, so we have i_data_sem. 1012 */ 1013 struct rw_semaphore i_data_sem; 1014 /* 1015 * i_mmap_sem is for serializing page faults with truncate / punch hole 1016 * operations. We have to make sure that new page cannot be faulted in 1017 * a section of the inode that is being punched. We cannot easily use 1018 * i_data_sem for this since we need protection for the whole punch 1019 * operation and i_data_sem ranks below transaction start so we have 1020 * to occasionally drop it. 1021 */ 1022 struct rw_semaphore i_mmap_sem; 1023 struct inode vfs_inode; 1024 struct jbd2_inode *jinode; 1025 1026 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 1027 1028 /* 1029 * File creation time. Its function is same as that of 1030 * struct timespec64 i_{a,c,m}time in the generic inode. 1031 */ 1032 struct timespec64 i_crtime; 1033 1034 /* mballoc */ 1035 struct list_head i_prealloc_list; 1036 spinlock_t i_prealloc_lock; 1037 1038 /* extents status tree */ 1039 struct ext4_es_tree i_es_tree; 1040 rwlock_t i_es_lock; 1041 struct list_head i_es_list; 1042 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1043 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1044 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1045 extents to shrink. Protected by 1046 i_es_lock */ 1047 1048 /* ialloc */ 1049 ext4_group_t i_last_alloc_group; 1050 1051 /* allocation reservation info for delalloc */ 1052 /* In case of bigalloc, this refer to clusters rather than blocks */ 1053 unsigned int i_reserved_data_blocks; 1054 1055 /* pending cluster reservations for bigalloc file systems */ 1056 struct ext4_pending_tree i_pending_tree; 1057 1058 /* on-disk additional length */ 1059 __u16 i_extra_isize; 1060 1061 /* Indicate the inline data space. */ 1062 u16 i_inline_off; 1063 u16 i_inline_size; 1064 1065 #ifdef CONFIG_QUOTA 1066 /* quota space reservation, managed internally by quota code */ 1067 qsize_t i_reserved_quota; 1068 #endif 1069 1070 /* Lock protecting lists below */ 1071 spinlock_t i_completed_io_lock; 1072 /* 1073 * Completed IOs that need unwritten extents handling and have 1074 * transaction reserved 1075 */ 1076 struct list_head i_rsv_conversion_list; 1077 struct work_struct i_rsv_conversion_work; 1078 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 1079 1080 spinlock_t i_block_reservation_lock; 1081 1082 /* 1083 * Transactions that contain inode's metadata needed to complete 1084 * fsync and fdatasync, respectively. 1085 */ 1086 tid_t i_sync_tid; 1087 tid_t i_datasync_tid; 1088 1089 #ifdef CONFIG_QUOTA 1090 struct dquot *i_dquot[MAXQUOTAS]; 1091 #endif 1092 1093 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1094 __u32 i_csum_seed; 1095 1096 kprojid_t i_projid; 1097 }; 1098 1099 /* 1100 * File system states 1101 */ 1102 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1103 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1104 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1105 1106 /* 1107 * Misc. filesystem flags 1108 */ 1109 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1110 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1111 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1112 1113 /* 1114 * Mount flags set via mount options or defaults 1115 */ 1116 #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */ 1117 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1118 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1119 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1120 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1121 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1122 #define EXT4_MOUNT_ERRORS_MASK 0x00070 1123 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1124 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1125 #ifdef CONFIG_FS_DAX 1126 #define EXT4_MOUNT_DAX 0x00200 /* Direct Access */ 1127 #else 1128 #define EXT4_MOUNT_DAX 0 1129 #endif 1130 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1131 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1132 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1133 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1134 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1135 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1136 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1137 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1138 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1139 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1140 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */ 1141 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota, 1142 * enable enforcement for hidden 1143 * quota files */ 1144 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable 1145 * enforcement for hidden quota 1146 * files */ 1147 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota 1148 * enforcement */ 1149 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1150 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1151 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1152 #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */ 1153 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1154 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1155 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1156 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1157 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1158 1159 /* 1160 * Mount flags set either automatically (could not be set by mount option) 1161 * based on per file system feature or property or in special cases such as 1162 * distinguishing between explicit mount option definition and default. 1163 */ 1164 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1165 specified delalloc */ 1166 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1167 size of blocksize * 8 1168 blocks */ 1169 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1170 file systems */ 1171 1172 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1173 specified journal checksum */ 1174 1175 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1176 ~EXT4_MOUNT_##opt 1177 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1178 EXT4_MOUNT_##opt 1179 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1180 EXT4_MOUNT_##opt) 1181 1182 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1183 ~EXT4_MOUNT2_##opt 1184 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1185 EXT4_MOUNT2_##opt 1186 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1187 EXT4_MOUNT2_##opt) 1188 1189 #define ext4_test_and_set_bit __test_and_set_bit_le 1190 #define ext4_set_bit __set_bit_le 1191 #define ext4_set_bit_atomic ext2_set_bit_atomic 1192 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1193 #define ext4_clear_bit __clear_bit_le 1194 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1195 #define ext4_test_bit test_bit_le 1196 #define ext4_find_next_zero_bit find_next_zero_bit_le 1197 #define ext4_find_next_bit find_next_bit_le 1198 1199 extern void ext4_set_bits(void *bm, int cur, int len); 1200 1201 /* 1202 * Maximal mount counts between two filesystem checks 1203 */ 1204 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1205 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1206 1207 /* 1208 * Behaviour when detecting errors 1209 */ 1210 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1211 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1212 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1213 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1214 1215 /* Metadata checksum algorithm codes */ 1216 #define EXT4_CRC32C_CHKSUM 1 1217 1218 /* 1219 * Structure of the super block 1220 */ 1221 struct ext4_super_block { 1222 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1223 __le32 s_blocks_count_lo; /* Blocks count */ 1224 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1225 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1226 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1227 __le32 s_first_data_block; /* First Data Block */ 1228 __le32 s_log_block_size; /* Block size */ 1229 __le32 s_log_cluster_size; /* Allocation cluster size */ 1230 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1231 __le32 s_clusters_per_group; /* # Clusters per group */ 1232 __le32 s_inodes_per_group; /* # Inodes per group */ 1233 __le32 s_mtime; /* Mount time */ 1234 /*30*/ __le32 s_wtime; /* Write time */ 1235 __le16 s_mnt_count; /* Mount count */ 1236 __le16 s_max_mnt_count; /* Maximal mount count */ 1237 __le16 s_magic; /* Magic signature */ 1238 __le16 s_state; /* File system state */ 1239 __le16 s_errors; /* Behaviour when detecting errors */ 1240 __le16 s_minor_rev_level; /* minor revision level */ 1241 /*40*/ __le32 s_lastcheck; /* time of last check */ 1242 __le32 s_checkinterval; /* max. time between checks */ 1243 __le32 s_creator_os; /* OS */ 1244 __le32 s_rev_level; /* Revision level */ 1245 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1246 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1247 /* 1248 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1249 * 1250 * Note: the difference between the compatible feature set and 1251 * the incompatible feature set is that if there is a bit set 1252 * in the incompatible feature set that the kernel doesn't 1253 * know about, it should refuse to mount the filesystem. 1254 * 1255 * e2fsck's requirements are more strict; if it doesn't know 1256 * about a feature in either the compatible or incompatible 1257 * feature set, it must abort and not try to meddle with 1258 * things it doesn't understand... 1259 */ 1260 __le32 s_first_ino; /* First non-reserved inode */ 1261 __le16 s_inode_size; /* size of inode structure */ 1262 __le16 s_block_group_nr; /* block group # of this superblock */ 1263 __le32 s_feature_compat; /* compatible feature set */ 1264 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1265 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1266 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1267 /*78*/ char s_volume_name[16]; /* volume name */ 1268 /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */ 1269 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1270 /* 1271 * Performance hints. Directory preallocation should only 1272 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1273 */ 1274 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1275 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1276 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1277 /* 1278 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1279 */ 1280 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1281 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1282 __le32 s_journal_dev; /* device number of journal file */ 1283 __le32 s_last_orphan; /* start of list of inodes to delete */ 1284 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1285 __u8 s_def_hash_version; /* Default hash version to use */ 1286 __u8 s_jnl_backup_type; 1287 __le16 s_desc_size; /* size of group descriptor */ 1288 /*100*/ __le32 s_default_mount_opts; 1289 __le32 s_first_meta_bg; /* First metablock block group */ 1290 __le32 s_mkfs_time; /* When the filesystem was created */ 1291 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1292 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1293 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1294 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1295 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1296 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1297 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1298 __le32 s_flags; /* Miscellaneous flags */ 1299 __le16 s_raid_stride; /* RAID stride */ 1300 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1301 __le64 s_mmp_block; /* Block for multi-mount protection */ 1302 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1303 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1304 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1305 __u8 s_encryption_level; /* versioning level for encryption */ 1306 __u8 s_reserved_pad; /* Padding to next 32bits */ 1307 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1308 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1309 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1310 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1311 snapshot's future use */ 1312 __le32 s_snapshot_list; /* inode number of the head of the 1313 on-disk snapshot list */ 1314 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1315 __le32 s_error_count; /* number of fs errors */ 1316 __le32 s_first_error_time; /* first time an error happened */ 1317 __le32 s_first_error_ino; /* inode involved in first error */ 1318 __le64 s_first_error_block; /* block involved of first error */ 1319 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */ 1320 __le32 s_first_error_line; /* line number where error happened */ 1321 __le32 s_last_error_time; /* most recent time of an error */ 1322 __le32 s_last_error_ino; /* inode involved in last error */ 1323 __le32 s_last_error_line; /* line number where error happened */ 1324 __le64 s_last_error_block; /* block involved of last error */ 1325 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */ 1326 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1327 __u8 s_mount_opts[64]; 1328 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1329 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1330 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1331 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1332 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1333 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1334 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1335 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1336 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1337 __u8 s_wtime_hi; 1338 __u8 s_mtime_hi; 1339 __u8 s_mkfs_time_hi; 1340 __u8 s_lastcheck_hi; 1341 __u8 s_first_error_time_hi; 1342 __u8 s_last_error_time_hi; 1343 __u8 s_first_error_errcode; 1344 __u8 s_last_error_errcode; 1345 __le16 s_encoding; /* Filename charset encoding */ 1346 __le16 s_encoding_flags; /* Filename charset encoding flags */ 1347 __le32 s_reserved[95]; /* Padding to the end of the block */ 1348 __le32 s_checksum; /* crc32c(superblock) */ 1349 }; 1350 1351 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1352 1353 #ifdef __KERNEL__ 1354 1355 /* 1356 * run-time mount flags 1357 */ 1358 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1359 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1360 1361 #ifdef CONFIG_FS_ENCRYPTION 1362 #define DUMMY_ENCRYPTION_ENABLED(sbi) ((sbi)->s_dummy_enc_ctx.ctx != NULL) 1363 #else 1364 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0) 1365 #endif 1366 1367 /* Number of quota types we support */ 1368 #define EXT4_MAXQUOTAS 3 1369 1370 #define EXT4_ENC_UTF8_12_1 1 1371 1372 /* 1373 * Flags for ext4_sb_info.s_encoding_flags. 1374 */ 1375 #define EXT4_ENC_STRICT_MODE_FL (1 << 0) 1376 1377 #define ext4_has_strict_mode(sbi) \ 1378 (sbi->s_encoding_flags & EXT4_ENC_STRICT_MODE_FL) 1379 1380 /* 1381 * fourth extended-fs super-block data in memory 1382 */ 1383 struct ext4_sb_info { 1384 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1385 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1386 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1387 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1388 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1389 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1390 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1391 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1392 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1393 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1394 unsigned long s_overhead; /* # of fs overhead clusters */ 1395 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1396 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1397 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1398 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1399 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1400 struct buffer_head * __rcu *s_group_desc; 1401 unsigned int s_mount_opt; 1402 unsigned int s_mount_opt2; 1403 unsigned int s_mount_flags; 1404 unsigned int s_def_mount_opt; 1405 ext4_fsblk_t s_sb_block; 1406 atomic64_t s_resv_clusters; 1407 kuid_t s_resuid; 1408 kgid_t s_resgid; 1409 unsigned short s_mount_state; 1410 unsigned short s_pad; 1411 int s_addr_per_block_bits; 1412 int s_desc_per_block_bits; 1413 int s_inode_size; 1414 int s_first_ino; 1415 unsigned int s_inode_readahead_blks; 1416 unsigned int s_inode_goal; 1417 u32 s_hash_seed[4]; 1418 int s_def_hash_version; 1419 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1420 struct percpu_counter s_freeclusters_counter; 1421 struct percpu_counter s_freeinodes_counter; 1422 struct percpu_counter s_dirs_counter; 1423 struct percpu_counter s_dirtyclusters_counter; 1424 struct blockgroup_lock *s_blockgroup_lock; 1425 struct proc_dir_entry *s_proc; 1426 struct kobject s_kobj; 1427 struct completion s_kobj_unregister; 1428 struct super_block *s_sb; 1429 #ifdef CONFIG_UNICODE 1430 struct unicode_map *s_encoding; 1431 __u16 s_encoding_flags; 1432 #endif 1433 1434 /* Journaling */ 1435 struct journal_s *s_journal; 1436 struct list_head s_orphan; 1437 struct mutex s_orphan_lock; 1438 unsigned long s_ext4_flags; /* Ext4 superblock flags */ 1439 unsigned long s_commit_interval; 1440 u32 s_max_batch_time; 1441 u32 s_min_batch_time; 1442 struct block_device *journal_bdev; 1443 #ifdef CONFIG_QUOTA 1444 /* Names of quota files with journalled quota */ 1445 char __rcu *s_qf_names[EXT4_MAXQUOTAS]; 1446 int s_jquota_fmt; /* Format of quota to use */ 1447 #endif 1448 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1449 struct ext4_system_blocks __rcu *system_blks; 1450 1451 #ifdef EXTENTS_STATS 1452 /* ext4 extents stats */ 1453 unsigned long s_ext_min; 1454 unsigned long s_ext_max; 1455 unsigned long s_depth_max; 1456 spinlock_t s_ext_stats_lock; 1457 unsigned long s_ext_blocks; 1458 unsigned long s_ext_extents; 1459 #endif 1460 1461 /* for buddy allocator */ 1462 struct ext4_group_info ** __rcu *s_group_info; 1463 struct inode *s_buddy_cache; 1464 spinlock_t s_md_lock; 1465 unsigned short *s_mb_offsets; 1466 unsigned int *s_mb_maxs; 1467 unsigned int s_group_info_size; 1468 unsigned int s_mb_free_pending; 1469 struct list_head s_freed_data_list; /* List of blocks to be freed 1470 after commit completed */ 1471 1472 /* tunables */ 1473 unsigned long s_stripe; 1474 unsigned int s_mb_stream_request; 1475 unsigned int s_mb_max_to_scan; 1476 unsigned int s_mb_min_to_scan; 1477 unsigned int s_mb_stats; 1478 unsigned int s_mb_order2_reqs; 1479 unsigned int s_mb_group_prealloc; 1480 unsigned int s_max_dir_size_kb; 1481 /* where last allocation was done - for stream allocation */ 1482 unsigned long s_mb_last_group; 1483 unsigned long s_mb_last_start; 1484 1485 /* stats for buddy allocator */ 1486 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1487 atomic_t s_bal_success; /* we found long enough chunks */ 1488 atomic_t s_bal_allocated; /* in blocks */ 1489 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1490 atomic_t s_bal_goals; /* goal hits */ 1491 atomic_t s_bal_breaks; /* too long searches */ 1492 atomic_t s_bal_2orders; /* 2^order hits */ 1493 spinlock_t s_bal_lock; 1494 unsigned long s_mb_buddies_generated; 1495 unsigned long long s_mb_generation_time; 1496 atomic_t s_mb_lost_chunks; 1497 atomic_t s_mb_preallocated; 1498 atomic_t s_mb_discarded; 1499 atomic_t s_lock_busy; 1500 1501 /* locality groups */ 1502 struct ext4_locality_group __percpu *s_locality_groups; 1503 1504 /* for write statistics */ 1505 unsigned long s_sectors_written_start; 1506 u64 s_kbytes_written; 1507 1508 /* the size of zero-out chunk */ 1509 unsigned int s_extent_max_zeroout_kb; 1510 1511 unsigned int s_log_groups_per_flex; 1512 struct flex_groups * __rcu *s_flex_groups; 1513 ext4_group_t s_flex_groups_allocated; 1514 1515 /* workqueue for reserved extent conversions (buffered io) */ 1516 struct workqueue_struct *rsv_conversion_wq; 1517 1518 /* timer for periodic error stats printing */ 1519 struct timer_list s_err_report; 1520 1521 /* Lazy inode table initialization info */ 1522 struct ext4_li_request *s_li_request; 1523 /* Wait multiplier for lazy initialization thread */ 1524 unsigned int s_li_wait_mult; 1525 1526 /* Kernel thread for multiple mount protection */ 1527 struct task_struct *s_mmp_tsk; 1528 1529 /* record the last minlen when FITRIM is called. */ 1530 atomic_t s_last_trim_minblks; 1531 1532 /* Reference to checksum algorithm driver via cryptoapi */ 1533 struct crypto_shash *s_chksum_driver; 1534 1535 /* Precomputed FS UUID checksum for seeding other checksums */ 1536 __u32 s_csum_seed; 1537 1538 /* Reclaim extents from extent status tree */ 1539 struct shrinker s_es_shrinker; 1540 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1541 long s_es_nr_inode; 1542 struct ext4_es_stats s_es_stats; 1543 struct mb_cache *s_ea_block_cache; 1544 struct mb_cache *s_ea_inode_cache; 1545 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1546 1547 /* Ratelimit ext4 messages. */ 1548 struct ratelimit_state s_err_ratelimit_state; 1549 struct ratelimit_state s_warning_ratelimit_state; 1550 struct ratelimit_state s_msg_ratelimit_state; 1551 1552 /* Encryption context for '-o test_dummy_encryption' */ 1553 struct fscrypt_dummy_context s_dummy_enc_ctx; 1554 1555 /* 1556 * Barrier between writepages ops and changing any inode's JOURNAL_DATA 1557 * or EXTENTS flag. 1558 */ 1559 struct percpu_rw_semaphore s_writepages_rwsem; 1560 struct dax_device *s_daxdev; 1561 #ifdef CONFIG_EXT4_DEBUG 1562 unsigned long s_simulate_fail; 1563 #endif 1564 }; 1565 1566 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1567 { 1568 return sb->s_fs_info; 1569 } 1570 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1571 { 1572 return container_of(inode, struct ext4_inode_info, vfs_inode); 1573 } 1574 1575 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1576 { 1577 return ino == EXT4_ROOT_INO || 1578 (ino >= EXT4_FIRST_INO(sb) && 1579 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1580 } 1581 1582 /* 1583 * Returns: sbi->field[index] 1584 * Used to access an array element from the following sbi fields which require 1585 * rcu protection to avoid dereferencing an invalid pointer due to reassignment 1586 * - s_group_desc 1587 * - s_group_info 1588 * - s_flex_group 1589 */ 1590 #define sbi_array_rcu_deref(sbi, field, index) \ 1591 ({ \ 1592 typeof(*((sbi)->field)) _v; \ 1593 rcu_read_lock(); \ 1594 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \ 1595 rcu_read_unlock(); \ 1596 _v; \ 1597 }) 1598 1599 /* 1600 * Simulate_fail codes 1601 */ 1602 #define EXT4_SIM_BBITMAP_EIO 1 1603 #define EXT4_SIM_BBITMAP_CRC 2 1604 #define EXT4_SIM_IBITMAP_EIO 3 1605 #define EXT4_SIM_IBITMAP_CRC 4 1606 #define EXT4_SIM_INODE_EIO 5 1607 #define EXT4_SIM_INODE_CRC 6 1608 #define EXT4_SIM_DIRBLOCK_EIO 7 1609 #define EXT4_SIM_DIRBLOCK_CRC 8 1610 1611 static inline bool ext4_simulate_fail(struct super_block *sb, 1612 unsigned long code) 1613 { 1614 #ifdef CONFIG_EXT4_DEBUG 1615 struct ext4_sb_info *sbi = EXT4_SB(sb); 1616 1617 if (unlikely(sbi->s_simulate_fail == code)) { 1618 sbi->s_simulate_fail = 0; 1619 return true; 1620 } 1621 #endif 1622 return false; 1623 } 1624 1625 static inline void ext4_simulate_fail_bh(struct super_block *sb, 1626 struct buffer_head *bh, 1627 unsigned long code) 1628 { 1629 if (!IS_ERR(bh) && ext4_simulate_fail(sb, code)) 1630 clear_buffer_uptodate(bh); 1631 } 1632 1633 /* 1634 * Error number codes for s_{first,last}_error_errno 1635 * 1636 * Linux errno numbers are architecture specific, so we need to translate 1637 * them into something which is architecture independent. We don't define 1638 * codes for all errno's; just the ones which are most likely to be the cause 1639 * of an ext4_error() call. 1640 */ 1641 #define EXT4_ERR_UNKNOWN 1 1642 #define EXT4_ERR_EIO 2 1643 #define EXT4_ERR_ENOMEM 3 1644 #define EXT4_ERR_EFSBADCRC 4 1645 #define EXT4_ERR_EFSCORRUPTED 5 1646 #define EXT4_ERR_ENOSPC 6 1647 #define EXT4_ERR_ENOKEY 7 1648 #define EXT4_ERR_EROFS 8 1649 #define EXT4_ERR_EFBIG 9 1650 #define EXT4_ERR_EEXIST 10 1651 #define EXT4_ERR_ERANGE 11 1652 #define EXT4_ERR_EOVERFLOW 12 1653 #define EXT4_ERR_EBUSY 13 1654 #define EXT4_ERR_ENOTDIR 14 1655 #define EXT4_ERR_ENOTEMPTY 15 1656 #define EXT4_ERR_ESHUTDOWN 16 1657 #define EXT4_ERR_EFAULT 17 1658 1659 /* 1660 * Inode dynamic state flags 1661 */ 1662 enum { 1663 EXT4_STATE_JDATA, /* journaled data exists */ 1664 EXT4_STATE_NEW, /* inode is newly created */ 1665 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1666 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1667 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1668 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1669 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1670 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1671 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1672 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */ 1673 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */ 1674 }; 1675 1676 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1677 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1678 { \ 1679 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1680 } \ 1681 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1682 { \ 1683 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1684 } \ 1685 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1686 { \ 1687 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1688 } 1689 1690 /* Add these declarations here only so that these functions can be 1691 * found by name. Otherwise, they are very hard to locate. */ 1692 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1693 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1694 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1695 EXT4_INODE_BIT_FNS(flag, flags, 0) 1696 1697 /* Add these declarations here only so that these functions can be 1698 * found by name. Otherwise, they are very hard to locate. */ 1699 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1700 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1701 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1702 #if (BITS_PER_LONG < 64) 1703 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1704 1705 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1706 { 1707 (ei)->i_state_flags = 0; 1708 } 1709 #else 1710 EXT4_INODE_BIT_FNS(state, flags, 32) 1711 1712 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1713 { 1714 /* We depend on the fact that callers will set i_flags */ 1715 } 1716 #endif 1717 #else 1718 /* Assume that user mode programs are passing in an ext4fs superblock, not 1719 * a kernel struct super_block. This will allow us to call the feature-test 1720 * macros from user land. */ 1721 #define EXT4_SB(sb) (sb) 1722 #endif 1723 1724 static inline bool ext4_verity_in_progress(struct inode *inode) 1725 { 1726 return IS_ENABLED(CONFIG_FS_VERITY) && 1727 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS); 1728 } 1729 1730 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1731 1732 /* 1733 * Codes for operating systems 1734 */ 1735 #define EXT4_OS_LINUX 0 1736 #define EXT4_OS_HURD 1 1737 #define EXT4_OS_MASIX 2 1738 #define EXT4_OS_FREEBSD 3 1739 #define EXT4_OS_LITES 4 1740 1741 /* 1742 * Revision levels 1743 */ 1744 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1745 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1746 1747 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1748 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1749 1750 #define EXT4_GOOD_OLD_INODE_SIZE 128 1751 1752 #define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN) 1753 #define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX 1754 #define EXT4_TIMESTAMP_MIN S32_MIN 1755 1756 /* 1757 * Feature set definitions 1758 */ 1759 1760 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1761 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1762 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1763 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1764 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1765 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1766 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1767 #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800 1768 1769 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1770 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1771 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1772 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1773 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1774 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1775 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1776 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1777 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1778 /* 1779 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1780 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1781 * all other data structures' checksums. However, the METADATA_CSUM and 1782 * GDT_CSUM bits are mutually exclusive. 1783 */ 1784 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1785 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1786 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 1787 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000 1788 1789 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1790 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1791 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1792 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1793 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1794 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1795 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1796 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1797 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1798 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1799 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1800 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 1801 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1802 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1803 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1804 #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000 1805 1806 extern void ext4_update_dynamic_rev(struct super_block *sb); 1807 1808 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 1809 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1810 { \ 1811 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1812 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 1813 } \ 1814 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1815 { \ 1816 ext4_update_dynamic_rev(sb); \ 1817 EXT4_SB(sb)->s_es->s_feature_compat |= \ 1818 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1819 } \ 1820 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1821 { \ 1822 EXT4_SB(sb)->s_es->s_feature_compat &= \ 1823 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1824 } 1825 1826 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 1827 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1828 { \ 1829 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1830 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 1831 } \ 1832 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1833 { \ 1834 ext4_update_dynamic_rev(sb); \ 1835 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 1836 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1837 } \ 1838 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1839 { \ 1840 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 1841 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1842 } 1843 1844 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 1845 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1846 { \ 1847 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1848 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 1849 } \ 1850 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1851 { \ 1852 ext4_update_dynamic_rev(sb); \ 1853 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 1854 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1855 } \ 1856 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1857 { \ 1858 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 1859 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1860 } 1861 1862 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 1863 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 1864 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 1865 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 1866 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 1867 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 1868 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 1869 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES) 1870 1871 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 1872 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 1873 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 1874 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 1875 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 1876 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 1877 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 1878 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 1879 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 1880 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 1881 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 1882 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 1883 EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY) 1884 1885 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 1886 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 1887 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 1888 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 1889 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 1890 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 1891 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 1892 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 1893 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 1894 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 1895 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 1896 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 1897 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 1898 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 1899 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 1900 EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD) 1901 1902 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1903 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1904 EXT4_FEATURE_INCOMPAT_META_BG) 1905 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1906 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1907 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1908 1909 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1910 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1911 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1912 EXT4_FEATURE_INCOMPAT_META_BG) 1913 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1914 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1915 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1916 1917 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1918 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1919 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1920 EXT4_FEATURE_INCOMPAT_META_BG| \ 1921 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1922 EXT4_FEATURE_INCOMPAT_64BIT| \ 1923 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1924 EXT4_FEATURE_INCOMPAT_EA_INODE| \ 1925 EXT4_FEATURE_INCOMPAT_MMP | \ 1926 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 1927 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 1928 EXT4_FEATURE_INCOMPAT_CASEFOLD | \ 1929 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \ 1930 EXT4_FEATURE_INCOMPAT_LARGEDIR) 1931 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1932 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1933 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1934 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1935 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1936 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1937 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1938 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1939 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1940 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 1941 EXT4_FEATURE_RO_COMPAT_PROJECT |\ 1942 EXT4_FEATURE_RO_COMPAT_VERITY) 1943 1944 #define EXTN_FEATURE_FUNCS(ver) \ 1945 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 1946 { \ 1947 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1948 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 1949 } \ 1950 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 1951 { \ 1952 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1953 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 1954 } \ 1955 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 1956 { \ 1957 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1958 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 1959 } 1960 1961 EXTN_FEATURE_FUNCS(2) 1962 EXTN_FEATURE_FUNCS(3) 1963 EXTN_FEATURE_FUNCS(4) 1964 1965 static inline bool ext4_has_compat_features(struct super_block *sb) 1966 { 1967 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 1968 } 1969 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 1970 { 1971 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 1972 } 1973 static inline bool ext4_has_incompat_features(struct super_block *sb) 1974 { 1975 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 1976 } 1977 1978 /* 1979 * Superblock flags 1980 */ 1981 #define EXT4_FLAGS_RESIZING 0 1982 #define EXT4_FLAGS_SHUTDOWN 1 1983 1984 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi) 1985 { 1986 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 1987 } 1988 1989 1990 /* 1991 * Default values for user and/or group using reserved blocks 1992 */ 1993 #define EXT4_DEF_RESUID 0 1994 #define EXT4_DEF_RESGID 0 1995 1996 /* 1997 * Default project ID 1998 */ 1999 #define EXT4_DEF_PROJID 0 2000 2001 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 2002 2003 /* 2004 * Default mount options 2005 */ 2006 #define EXT4_DEFM_DEBUG 0x0001 2007 #define EXT4_DEFM_BSDGROUPS 0x0002 2008 #define EXT4_DEFM_XATTR_USER 0x0004 2009 #define EXT4_DEFM_ACL 0x0008 2010 #define EXT4_DEFM_UID16 0x0010 2011 #define EXT4_DEFM_JMODE 0x0060 2012 #define EXT4_DEFM_JMODE_DATA 0x0020 2013 #define EXT4_DEFM_JMODE_ORDERED 0x0040 2014 #define EXT4_DEFM_JMODE_WBACK 0x0060 2015 #define EXT4_DEFM_NOBARRIER 0x0100 2016 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 2017 #define EXT4_DEFM_DISCARD 0x0400 2018 #define EXT4_DEFM_NODELALLOC 0x0800 2019 2020 /* 2021 * Default journal batch times 2022 */ 2023 #define EXT4_DEF_MIN_BATCH_TIME 0 2024 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 2025 2026 /* 2027 * Minimum number of groups in a flexgroup before we separate out 2028 * directories into the first block group of a flexgroup 2029 */ 2030 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 2031 2032 /* 2033 * Structure of a directory entry 2034 */ 2035 #define EXT4_NAME_LEN 255 2036 2037 struct ext4_dir_entry { 2038 __le32 inode; /* Inode number */ 2039 __le16 rec_len; /* Directory entry length */ 2040 __le16 name_len; /* Name length */ 2041 char name[EXT4_NAME_LEN]; /* File name */ 2042 }; 2043 2044 /* 2045 * The new version of the directory entry. Since EXT4 structures are 2046 * stored in intel byte order, and the name_len field could never be 2047 * bigger than 255 chars, it's safe to reclaim the extra byte for the 2048 * file_type field. 2049 */ 2050 struct ext4_dir_entry_2 { 2051 __le32 inode; /* Inode number */ 2052 __le16 rec_len; /* Directory entry length */ 2053 __u8 name_len; /* Name length */ 2054 __u8 file_type; 2055 char name[EXT4_NAME_LEN]; /* File name */ 2056 }; 2057 2058 /* 2059 * This is a bogus directory entry at the end of each leaf block that 2060 * records checksums. 2061 */ 2062 struct ext4_dir_entry_tail { 2063 __le32 det_reserved_zero1; /* Pretend to be unused */ 2064 __le16 det_rec_len; /* 12 */ 2065 __u8 det_reserved_zero2; /* Zero name length */ 2066 __u8 det_reserved_ft; /* 0xDE, fake file type */ 2067 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 2068 }; 2069 2070 #define EXT4_DIRENT_TAIL(block, blocksize) \ 2071 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 2072 ((blocksize) - \ 2073 sizeof(struct ext4_dir_entry_tail)))) 2074 2075 /* 2076 * Ext4 directory file types. Only the low 3 bits are used. The 2077 * other bits are reserved for now. 2078 */ 2079 #define EXT4_FT_UNKNOWN 0 2080 #define EXT4_FT_REG_FILE 1 2081 #define EXT4_FT_DIR 2 2082 #define EXT4_FT_CHRDEV 3 2083 #define EXT4_FT_BLKDEV 4 2084 #define EXT4_FT_FIFO 5 2085 #define EXT4_FT_SOCK 6 2086 #define EXT4_FT_SYMLINK 7 2087 2088 #define EXT4_FT_MAX 8 2089 2090 #define EXT4_FT_DIR_CSUM 0xDE 2091 2092 /* 2093 * EXT4_DIR_PAD defines the directory entries boundaries 2094 * 2095 * NOTE: It must be a multiple of 4 2096 */ 2097 #define EXT4_DIR_PAD 4 2098 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 2099 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 2100 ~EXT4_DIR_ROUND) 2101 #define EXT4_MAX_REC_LEN ((1<<16)-1) 2102 2103 /* 2104 * If we ever get support for fs block sizes > page_size, we'll need 2105 * to remove the #if statements in the next two functions... 2106 */ 2107 static inline unsigned int 2108 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 2109 { 2110 unsigned len = le16_to_cpu(dlen); 2111 2112 #if (PAGE_SIZE >= 65536) 2113 if (len == EXT4_MAX_REC_LEN || len == 0) 2114 return blocksize; 2115 return (len & 65532) | ((len & 3) << 16); 2116 #else 2117 return len; 2118 #endif 2119 } 2120 2121 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 2122 { 2123 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 2124 BUG(); 2125 #if (PAGE_SIZE >= 65536) 2126 if (len < 65536) 2127 return cpu_to_le16(len); 2128 if (len == blocksize) { 2129 if (blocksize == 65536) 2130 return cpu_to_le16(EXT4_MAX_REC_LEN); 2131 else 2132 return cpu_to_le16(0); 2133 } 2134 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 2135 #else 2136 return cpu_to_le16(len); 2137 #endif 2138 } 2139 2140 /* 2141 * Hash Tree Directory indexing 2142 * (c) Daniel Phillips, 2001 2143 */ 2144 2145 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2146 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2147 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \ 2148 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir))) 2149 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2150 2151 /* Legal values for the dx_root hash_version field: */ 2152 2153 #define DX_HASH_LEGACY 0 2154 #define DX_HASH_HALF_MD4 1 2155 #define DX_HASH_TEA 2 2156 #define DX_HASH_LEGACY_UNSIGNED 3 2157 #define DX_HASH_HALF_MD4_UNSIGNED 4 2158 #define DX_HASH_TEA_UNSIGNED 5 2159 2160 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 2161 const void *address, unsigned int length) 2162 { 2163 struct { 2164 struct shash_desc shash; 2165 char ctx[4]; 2166 } desc; 2167 2168 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2169 2170 desc.shash.tfm = sbi->s_chksum_driver; 2171 *(u32 *)desc.ctx = crc; 2172 2173 BUG_ON(crypto_shash_update(&desc.shash, address, length)); 2174 2175 return *(u32 *)desc.ctx; 2176 } 2177 2178 #ifdef __KERNEL__ 2179 2180 /* hash info structure used by the directory hash */ 2181 struct dx_hash_info 2182 { 2183 u32 hash; 2184 u32 minor_hash; 2185 int hash_version; 2186 u32 *seed; 2187 }; 2188 2189 2190 /* 32 and 64 bit signed EOF for dx directories */ 2191 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2192 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2193 2194 2195 /* 2196 * Control parameters used by ext4_htree_next_block 2197 */ 2198 #define HASH_NB_ALWAYS 1 2199 2200 struct ext4_filename { 2201 const struct qstr *usr_fname; 2202 struct fscrypt_str disk_name; 2203 struct dx_hash_info hinfo; 2204 #ifdef CONFIG_FS_ENCRYPTION 2205 struct fscrypt_str crypto_buf; 2206 #endif 2207 #ifdef CONFIG_UNICODE 2208 struct fscrypt_str cf_name; 2209 #endif 2210 }; 2211 2212 #define fname_name(p) ((p)->disk_name.name) 2213 #define fname_len(p) ((p)->disk_name.len) 2214 2215 /* 2216 * Describe an inode's exact location on disk and in memory 2217 */ 2218 struct ext4_iloc 2219 { 2220 struct buffer_head *bh; 2221 unsigned long offset; 2222 ext4_group_t block_group; 2223 }; 2224 2225 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2226 { 2227 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2228 } 2229 2230 static inline bool ext4_is_quota_file(struct inode *inode) 2231 { 2232 return IS_NOQUOTA(inode) && 2233 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL); 2234 } 2235 2236 /* 2237 * This structure is stuffed into the struct file's private_data field 2238 * for directories. It is where we put information so that we can do 2239 * readdir operations in hash tree order. 2240 */ 2241 struct dir_private_info { 2242 struct rb_root root; 2243 struct rb_node *curr_node; 2244 struct fname *extra_fname; 2245 loff_t last_pos; 2246 __u32 curr_hash; 2247 __u32 curr_minor_hash; 2248 __u32 next_hash; 2249 }; 2250 2251 /* calculate the first block number of the group */ 2252 static inline ext4_fsblk_t 2253 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2254 { 2255 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2256 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2257 } 2258 2259 /* 2260 * Special error return code only used by dx_probe() and its callers. 2261 */ 2262 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2263 2264 /* htree levels for ext4 */ 2265 #define EXT4_HTREE_LEVEL_COMPAT 2 2266 #define EXT4_HTREE_LEVEL 3 2267 2268 static inline int ext4_dir_htree_level(struct super_block *sb) 2269 { 2270 return ext4_has_feature_largedir(sb) ? 2271 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT; 2272 } 2273 2274 /* 2275 * Timeout and state flag for lazy initialization inode thread. 2276 */ 2277 #define EXT4_DEF_LI_WAIT_MULT 10 2278 #define EXT4_DEF_LI_MAX_START_DELAY 5 2279 #define EXT4_LAZYINIT_QUIT 0x0001 2280 #define EXT4_LAZYINIT_RUNNING 0x0002 2281 2282 /* 2283 * Lazy inode table initialization info 2284 */ 2285 struct ext4_lazy_init { 2286 unsigned long li_state; 2287 struct list_head li_request_list; 2288 struct mutex li_list_mtx; 2289 }; 2290 2291 struct ext4_li_request { 2292 struct super_block *lr_super; 2293 struct ext4_sb_info *lr_sbi; 2294 ext4_group_t lr_next_group; 2295 struct list_head lr_request; 2296 unsigned long lr_next_sched; 2297 unsigned long lr_timeout; 2298 }; 2299 2300 struct ext4_features { 2301 struct kobject f_kobj; 2302 struct completion f_kobj_unregister; 2303 }; 2304 2305 /* 2306 * This structure will be used for multiple mount protection. It will be 2307 * written into the block number saved in the s_mmp_block field in the 2308 * superblock. Programs that check MMP should assume that if 2309 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2310 * to use the filesystem, regardless of how old the timestamp is. 2311 */ 2312 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2313 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2314 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2315 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2316 2317 struct mmp_struct { 2318 __le32 mmp_magic; /* Magic number for MMP */ 2319 __le32 mmp_seq; /* Sequence no. updated periodically */ 2320 2321 /* 2322 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2323 * purposes and do not affect the correctness of the algorithm 2324 */ 2325 __le64 mmp_time; /* Time last updated */ 2326 char mmp_nodename[64]; /* Node which last updated MMP block */ 2327 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2328 2329 /* 2330 * mmp_check_interval is used to verify if the MMP block has been 2331 * updated on the block device. The value is updated based on the 2332 * maximum time to write the MMP block during an update cycle. 2333 */ 2334 __le16 mmp_check_interval; 2335 2336 __le16 mmp_pad1; 2337 __le32 mmp_pad2[226]; 2338 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2339 }; 2340 2341 /* arguments passed to the mmp thread */ 2342 struct mmpd_data { 2343 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2344 struct super_block *sb; /* super block of the fs */ 2345 }; 2346 2347 /* 2348 * Check interval multiplier 2349 * The MMP block is written every update interval and initially checked every 2350 * update interval x the multiplier (the value is then adapted based on the 2351 * write latency). The reason is that writes can be delayed under load and we 2352 * don't want readers to incorrectly assume that the filesystem is no longer 2353 * in use. 2354 */ 2355 #define EXT4_MMP_CHECK_MULT 2UL 2356 2357 /* 2358 * Minimum interval for MMP checking in seconds. 2359 */ 2360 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2361 2362 /* 2363 * Maximum interval for MMP checking in seconds. 2364 */ 2365 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2366 2367 /* 2368 * Function prototypes 2369 */ 2370 2371 /* 2372 * Ok, these declarations are also in <linux/kernel.h> but none of the 2373 * ext4 source programs needs to include it so they are duplicated here. 2374 */ 2375 # define NORET_TYPE /**/ 2376 # define ATTRIB_NORET __attribute__((noreturn)) 2377 # define NORET_AND noreturn, 2378 2379 /* bitmap.c */ 2380 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2381 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2382 struct ext4_group_desc *gdp, 2383 struct buffer_head *bh, int sz); 2384 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2385 struct ext4_group_desc *gdp, 2386 struct buffer_head *bh, int sz); 2387 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2388 struct ext4_group_desc *gdp, 2389 struct buffer_head *bh); 2390 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2391 struct ext4_group_desc *gdp, 2392 struct buffer_head *bh); 2393 2394 /* balloc.c */ 2395 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2396 ext4_fsblk_t blocknr, 2397 ext4_group_t *blockgrpp, 2398 ext4_grpblk_t *offsetp); 2399 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2400 ext4_fsblk_t block); 2401 2402 extern unsigned int ext4_block_group(struct super_block *sb, 2403 ext4_fsblk_t blocknr); 2404 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2405 ext4_fsblk_t blocknr); 2406 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2407 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2408 ext4_group_t group); 2409 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2410 ext4_fsblk_t goal, 2411 unsigned int flags, 2412 unsigned long *count, 2413 int *errp); 2414 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2415 s64 nclusters, unsigned int flags); 2416 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2417 extern void ext4_check_blocks_bitmap(struct super_block *); 2418 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2419 ext4_group_t block_group, 2420 struct buffer_head ** bh); 2421 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2422 2423 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2424 ext4_group_t block_group); 2425 extern int ext4_wait_block_bitmap(struct super_block *sb, 2426 ext4_group_t block_group, 2427 struct buffer_head *bh); 2428 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2429 ext4_group_t block_group); 2430 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2431 ext4_group_t block_group, 2432 struct ext4_group_desc *gdp); 2433 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2434 2435 #ifdef CONFIG_UNICODE 2436 extern void ext4_fname_setup_ci_filename(struct inode *dir, 2437 const struct qstr *iname, 2438 struct fscrypt_str *fname); 2439 #endif 2440 2441 #ifdef CONFIG_FS_ENCRYPTION 2442 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst, 2443 const struct fscrypt_name *src) 2444 { 2445 memset(dst, 0, sizeof(*dst)); 2446 2447 dst->usr_fname = src->usr_fname; 2448 dst->disk_name = src->disk_name; 2449 dst->hinfo.hash = src->hash; 2450 dst->hinfo.minor_hash = src->minor_hash; 2451 dst->crypto_buf = src->crypto_buf; 2452 } 2453 2454 static inline int ext4_fname_setup_filename(struct inode *dir, 2455 const struct qstr *iname, 2456 int lookup, 2457 struct ext4_filename *fname) 2458 { 2459 struct fscrypt_name name; 2460 int err; 2461 2462 err = fscrypt_setup_filename(dir, iname, lookup, &name); 2463 if (err) 2464 return err; 2465 2466 ext4_fname_from_fscrypt_name(fname, &name); 2467 2468 #ifdef CONFIG_UNICODE 2469 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name); 2470 #endif 2471 return 0; 2472 } 2473 2474 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2475 struct dentry *dentry, 2476 struct ext4_filename *fname) 2477 { 2478 struct fscrypt_name name; 2479 int err; 2480 2481 err = fscrypt_prepare_lookup(dir, dentry, &name); 2482 if (err) 2483 return err; 2484 2485 ext4_fname_from_fscrypt_name(fname, &name); 2486 2487 #ifdef CONFIG_UNICODE 2488 ext4_fname_setup_ci_filename(dir, &dentry->d_name, &fname->cf_name); 2489 #endif 2490 return 0; 2491 } 2492 2493 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2494 { 2495 struct fscrypt_name name; 2496 2497 name.crypto_buf = fname->crypto_buf; 2498 fscrypt_free_filename(&name); 2499 2500 fname->crypto_buf.name = NULL; 2501 fname->usr_fname = NULL; 2502 fname->disk_name.name = NULL; 2503 2504 #ifdef CONFIG_UNICODE 2505 kfree(fname->cf_name.name); 2506 fname->cf_name.name = NULL; 2507 #endif 2508 } 2509 #else /* !CONFIG_FS_ENCRYPTION */ 2510 static inline int ext4_fname_setup_filename(struct inode *dir, 2511 const struct qstr *iname, 2512 int lookup, 2513 struct ext4_filename *fname) 2514 { 2515 fname->usr_fname = iname; 2516 fname->disk_name.name = (unsigned char *) iname->name; 2517 fname->disk_name.len = iname->len; 2518 2519 #ifdef CONFIG_UNICODE 2520 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name); 2521 #endif 2522 2523 return 0; 2524 } 2525 2526 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2527 struct dentry *dentry, 2528 struct ext4_filename *fname) 2529 { 2530 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname); 2531 } 2532 2533 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2534 { 2535 #ifdef CONFIG_UNICODE 2536 kfree(fname->cf_name.name); 2537 fname->cf_name.name = NULL; 2538 #endif 2539 } 2540 #endif /* !CONFIG_FS_ENCRYPTION */ 2541 2542 /* dir.c */ 2543 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2544 struct file *, 2545 struct ext4_dir_entry_2 *, 2546 struct buffer_head *, char *, int, 2547 unsigned int); 2548 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2549 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2550 (de), (bh), (buf), (size), (offset))) 2551 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2552 __u32 minor_hash, 2553 struct ext4_dir_entry_2 *dirent, 2554 struct fscrypt_str *ent_name); 2555 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2556 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2557 struct buffer_head *bh, 2558 void *buf, int buf_size, 2559 struct ext4_filename *fname, 2560 struct ext4_dir_entry_2 **dest_de); 2561 void ext4_insert_dentry(struct inode *inode, 2562 struct ext4_dir_entry_2 *de, 2563 int buf_size, 2564 struct ext4_filename *fname); 2565 static inline void ext4_update_dx_flag(struct inode *inode) 2566 { 2567 if (!ext4_has_feature_dir_index(inode->i_sb)) { 2568 /* ext4_iget() should have caught this... */ 2569 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb)); 2570 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2571 } 2572 } 2573 static const unsigned char ext4_filetype_table[] = { 2574 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2575 }; 2576 2577 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2578 { 2579 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2580 return DT_UNKNOWN; 2581 2582 return ext4_filetype_table[filetype]; 2583 } 2584 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2585 void *buf, int buf_size); 2586 2587 /* fsync.c */ 2588 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2589 2590 /* hash.c */ 2591 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len, 2592 struct dx_hash_info *hinfo); 2593 2594 /* ialloc.c */ 2595 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2596 const struct qstr *qstr, __u32 goal, 2597 uid_t *owner, __u32 i_flags, 2598 int handle_type, unsigned int line_no, 2599 int nblocks); 2600 2601 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \ 2602 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2603 i_flags, 0, 0, 0) 2604 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2605 type, nblocks) \ 2606 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2607 0, (type), __LINE__, (nblocks)) 2608 2609 2610 extern void ext4_free_inode(handle_t *, struct inode *); 2611 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2612 extern unsigned long ext4_count_free_inodes(struct super_block *); 2613 extern unsigned long ext4_count_dirs(struct super_block *); 2614 extern void ext4_check_inodes_bitmap(struct super_block *); 2615 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2616 extern int ext4_init_inode_table(struct super_block *sb, 2617 ext4_group_t group, int barrier); 2618 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2619 2620 /* mballoc.c */ 2621 extern const struct seq_operations ext4_mb_seq_groups_ops; 2622 extern long ext4_mb_stats; 2623 extern long ext4_mb_max_to_scan; 2624 extern int ext4_mb_init(struct super_block *); 2625 extern int ext4_mb_release(struct super_block *); 2626 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2627 struct ext4_allocation_request *, int *); 2628 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2629 extern void ext4_discard_preallocations(struct inode *); 2630 extern int __init ext4_init_mballoc(void); 2631 extern void ext4_exit_mballoc(void); 2632 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2633 struct buffer_head *bh, ext4_fsblk_t block, 2634 unsigned long count, int flags); 2635 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2636 ext4_group_t ngroups); 2637 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2638 ext4_group_t i, struct ext4_group_desc *desc); 2639 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2640 ext4_fsblk_t block, unsigned long count); 2641 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2642 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid); 2643 2644 /* inode.c */ 2645 int ext4_inode_is_fast_symlink(struct inode *inode); 2646 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2647 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2648 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count, 2649 bool wait, struct buffer_head **bhs); 2650 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2651 struct buffer_head *bh_result, int create); 2652 int ext4_get_block(struct inode *inode, sector_t iblock, 2653 struct buffer_head *bh_result, int create); 2654 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2655 struct buffer_head *bh, int create); 2656 int ext4_walk_page_buffers(handle_t *handle, 2657 struct buffer_head *head, 2658 unsigned from, 2659 unsigned to, 2660 int *partial, 2661 int (*fn)(handle_t *handle, 2662 struct buffer_head *bh)); 2663 int do_journal_get_write_access(handle_t *handle, 2664 struct buffer_head *bh); 2665 #define FALL_BACK_TO_NONDELALLOC 1 2666 #define CONVERT_INLINE_DATA 2 2667 2668 typedef enum { 2669 EXT4_IGET_NORMAL = 0, 2670 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */ 2671 EXT4_IGET_HANDLE = 0x0002 /* Inode # is from a handle */ 2672 } ext4_iget_flags; 2673 2674 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, 2675 ext4_iget_flags flags, const char *function, 2676 unsigned int line); 2677 2678 #define ext4_iget(sb, ino, flags) \ 2679 __ext4_iget((sb), (ino), (flags), __func__, __LINE__) 2680 2681 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2682 extern int ext4_setattr(struct dentry *, struct iattr *); 2683 extern int ext4_getattr(const struct path *, struct kstat *, u32, unsigned int); 2684 extern void ext4_evict_inode(struct inode *); 2685 extern void ext4_clear_inode(struct inode *); 2686 extern int ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int); 2687 extern int ext4_sync_inode(handle_t *, struct inode *); 2688 extern void ext4_dirty_inode(struct inode *, int); 2689 extern int ext4_change_inode_journal_flag(struct inode *, int); 2690 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2691 extern int ext4_inode_attach_jinode(struct inode *inode); 2692 extern int ext4_can_truncate(struct inode *inode); 2693 extern int ext4_truncate(struct inode *); 2694 extern int ext4_break_layouts(struct inode *); 2695 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2696 extern void ext4_set_inode_flags(struct inode *); 2697 extern int ext4_alloc_da_blocks(struct inode *inode); 2698 extern void ext4_set_aops(struct inode *inode); 2699 extern int ext4_writepage_trans_blocks(struct inode *); 2700 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2701 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2702 loff_t lstart, loff_t lend); 2703 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf); 2704 extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf); 2705 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2706 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 2707 extern void ext4_da_release_space(struct inode *inode, int to_free); 2708 extern void ext4_da_update_reserve_space(struct inode *inode, 2709 int used, int quota_claim); 2710 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 2711 ext4_fsblk_t pblk, ext4_lblk_t len); 2712 2713 /* indirect.c */ 2714 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2715 struct ext4_map_blocks *map, int flags); 2716 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2717 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2718 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2719 ext4_lblk_t start, ext4_lblk_t end); 2720 2721 /* ioctl.c */ 2722 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2723 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2724 2725 /* migrate.c */ 2726 extern int ext4_ext_migrate(struct inode *); 2727 extern int ext4_ind_migrate(struct inode *inode); 2728 2729 /* namei.c */ 2730 extern int ext4_dirblock_csum_verify(struct inode *inode, 2731 struct buffer_head *bh); 2732 extern int ext4_orphan_add(handle_t *, struct inode *); 2733 extern int ext4_orphan_del(handle_t *, struct inode *); 2734 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2735 __u32 start_minor_hash, __u32 *next_hash); 2736 extern int ext4_search_dir(struct buffer_head *bh, 2737 char *search_buf, 2738 int buf_size, 2739 struct inode *dir, 2740 struct ext4_filename *fname, 2741 unsigned int offset, 2742 struct ext4_dir_entry_2 **res_dir); 2743 extern int ext4_generic_delete_entry(handle_t *handle, 2744 struct inode *dir, 2745 struct ext4_dir_entry_2 *de_del, 2746 struct buffer_head *bh, 2747 void *entry_buf, 2748 int buf_size, 2749 int csum_size); 2750 extern bool ext4_empty_dir(struct inode *inode); 2751 2752 /* resize.c */ 2753 extern void ext4_kvfree_array_rcu(void *to_free); 2754 extern int ext4_group_add(struct super_block *sb, 2755 struct ext4_new_group_data *input); 2756 extern int ext4_group_extend(struct super_block *sb, 2757 struct ext4_super_block *es, 2758 ext4_fsblk_t n_blocks_count); 2759 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2760 2761 /* super.c */ 2762 extern struct buffer_head *ext4_sb_bread(struct super_block *sb, 2763 sector_t block, int op_flags); 2764 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 2765 extern int ext4_calculate_overhead(struct super_block *sb); 2766 extern void ext4_superblock_csum_set(struct super_block *sb); 2767 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2768 ext4_group_t ngroup); 2769 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2770 char nbuf[16]); 2771 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb, 2772 ext4_group_t block_group, 2773 unsigned int flags); 2774 2775 extern __printf(6, 7) 2776 void __ext4_error(struct super_block *, const char *, unsigned int, int, __u64, 2777 const char *, ...); 2778 extern __printf(6, 7) 2779 void __ext4_error_inode(struct inode *, const char *, unsigned int, 2780 ext4_fsblk_t, int, const char *, ...); 2781 extern __printf(5, 6) 2782 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2783 const char *, ...); 2784 extern void __ext4_std_error(struct super_block *, const char *, 2785 unsigned int, int); 2786 extern __printf(5, 6) 2787 void __ext4_abort(struct super_block *, const char *, unsigned int, int, 2788 const char *, ...); 2789 extern __printf(4, 5) 2790 void __ext4_warning(struct super_block *, const char *, unsigned int, 2791 const char *, ...); 2792 extern __printf(4, 5) 2793 void __ext4_warning_inode(const struct inode *inode, const char *function, 2794 unsigned int line, const char *fmt, ...); 2795 extern __printf(3, 4) 2796 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2797 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2798 const char *, unsigned int, const char *); 2799 extern __printf(7, 8) 2800 void __ext4_grp_locked_error(const char *, unsigned int, 2801 struct super_block *, ext4_group_t, 2802 unsigned long, ext4_fsblk_t, 2803 const char *, ...); 2804 2805 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 2806 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 2807 2808 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \ 2809 __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a) 2810 2811 #define ext4_error_inode_block(inode, block, err, fmt, a...) \ 2812 __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \ 2813 (fmt), ## a) 2814 2815 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 2816 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 2817 2818 #ifdef CONFIG_PRINTK 2819 2820 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2821 __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__) 2822 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 2823 __ext4_error_inode((inode), (func), (line), (block), \ 2824 (err), (fmt), ##__VA_ARGS__) 2825 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2826 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2827 #define ext4_error(sb, fmt, ...) \ 2828 __ext4_error((sb), __func__, __LINE__, 0, 0, (fmt), ##__VA_ARGS__) 2829 #define ext4_error_err(sb, err, fmt, ...) \ 2830 __ext4_error((sb), __func__, __LINE__, (err), 0, (fmt), ##__VA_ARGS__) 2831 #define ext4_abort(sb, err, fmt, ...) \ 2832 __ext4_abort((sb), __func__, __LINE__, (err), (fmt), ##__VA_ARGS__) 2833 #define ext4_warning(sb, fmt, ...) \ 2834 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2835 #define ext4_warning_inode(inode, fmt, ...) \ 2836 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 2837 #define ext4_msg(sb, level, fmt, ...) \ 2838 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 2839 #define dump_mmp_msg(sb, mmp, msg) \ 2840 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 2841 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2842 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 2843 fmt, ##__VA_ARGS__) 2844 2845 #else 2846 2847 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2848 do { \ 2849 no_printk(fmt, ##__VA_ARGS__); \ 2850 __ext4_error_inode(inode, "", 0, block, 0, " "); \ 2851 } while (0) 2852 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 2853 do { \ 2854 no_printk(fmt, ##__VA_ARGS__); \ 2855 __ext4_error_inode(inode, "", 0, block, err, " "); \ 2856 } while (0) 2857 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2858 do { \ 2859 no_printk(fmt, ##__VA_ARGS__); \ 2860 __ext4_error_file(file, "", 0, block, " "); \ 2861 } while (0) 2862 #define ext4_error(sb, fmt, ...) \ 2863 do { \ 2864 no_printk(fmt, ##__VA_ARGS__); \ 2865 __ext4_error(sb, "", 0, 0, 0, " "); \ 2866 } while (0) 2867 #define ext4_error_err(sb, err, fmt, ...) \ 2868 do { \ 2869 no_printk(fmt, ##__VA_ARGS__); \ 2870 __ext4_error(sb, "", 0, err, 0, " "); \ 2871 } while (0) 2872 #define ext4_abort(sb, err, fmt, ...) \ 2873 do { \ 2874 no_printk(fmt, ##__VA_ARGS__); \ 2875 __ext4_abort(sb, "", 0, err, " "); \ 2876 } while (0) 2877 #define ext4_warning(sb, fmt, ...) \ 2878 do { \ 2879 no_printk(fmt, ##__VA_ARGS__); \ 2880 __ext4_warning(sb, "", 0, " "); \ 2881 } while (0) 2882 #define ext4_warning_inode(inode, fmt, ...) \ 2883 do { \ 2884 no_printk(fmt, ##__VA_ARGS__); \ 2885 __ext4_warning_inode(inode, "", 0, " "); \ 2886 } while (0) 2887 #define ext4_msg(sb, level, fmt, ...) \ 2888 do { \ 2889 no_printk(fmt, ##__VA_ARGS__); \ 2890 __ext4_msg(sb, "", " "); \ 2891 } while (0) 2892 #define dump_mmp_msg(sb, mmp, msg) \ 2893 __dump_mmp_msg(sb, mmp, "", 0, "") 2894 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2895 do { \ 2896 no_printk(fmt, ##__VA_ARGS__); \ 2897 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 2898 } while (0) 2899 2900 #endif 2901 2902 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2903 __u32 compat); 2904 extern int ext4_update_rocompat_feature(handle_t *handle, 2905 struct super_block *sb, __u32 rocompat); 2906 extern int ext4_update_incompat_feature(handle_t *handle, 2907 struct super_block *sb, __u32 incompat); 2908 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2909 struct ext4_group_desc *bg); 2910 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2911 struct ext4_group_desc *bg); 2912 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2913 struct ext4_group_desc *bg); 2914 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2915 struct ext4_group_desc *bg); 2916 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2917 struct ext4_group_desc *bg); 2918 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2919 struct ext4_group_desc *bg); 2920 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2921 struct ext4_group_desc *bg); 2922 extern void ext4_block_bitmap_set(struct super_block *sb, 2923 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2924 extern void ext4_inode_bitmap_set(struct super_block *sb, 2925 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2926 extern void ext4_inode_table_set(struct super_block *sb, 2927 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2928 extern void ext4_free_group_clusters_set(struct super_block *sb, 2929 struct ext4_group_desc *bg, 2930 __u32 count); 2931 extern void ext4_free_inodes_set(struct super_block *sb, 2932 struct ext4_group_desc *bg, __u32 count); 2933 extern void ext4_used_dirs_set(struct super_block *sb, 2934 struct ext4_group_desc *bg, __u32 count); 2935 extern void ext4_itable_unused_set(struct super_block *sb, 2936 struct ext4_group_desc *bg, __u32 count); 2937 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2938 struct ext4_group_desc *gdp); 2939 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2940 struct ext4_group_desc *gdp); 2941 extern int ext4_register_li_request(struct super_block *sb, 2942 ext4_group_t first_not_zeroed); 2943 2944 static inline int ext4_has_metadata_csum(struct super_block *sb) 2945 { 2946 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 2947 !EXT4_SB(sb)->s_chksum_driver); 2948 2949 return ext4_has_feature_metadata_csum(sb) && 2950 (EXT4_SB(sb)->s_chksum_driver != NULL); 2951 } 2952 2953 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2954 { 2955 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb); 2956 } 2957 2958 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2959 { 2960 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2961 le32_to_cpu(es->s_blocks_count_lo); 2962 } 2963 2964 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2965 { 2966 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2967 le32_to_cpu(es->s_r_blocks_count_lo); 2968 } 2969 2970 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2971 { 2972 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2973 le32_to_cpu(es->s_free_blocks_count_lo); 2974 } 2975 2976 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2977 ext4_fsblk_t blk) 2978 { 2979 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2980 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2981 } 2982 2983 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2984 ext4_fsblk_t blk) 2985 { 2986 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2987 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2988 } 2989 2990 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2991 ext4_fsblk_t blk) 2992 { 2993 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2994 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2995 } 2996 2997 static inline loff_t ext4_isize(struct super_block *sb, 2998 struct ext4_inode *raw_inode) 2999 { 3000 if (ext4_has_feature_largedir(sb) || 3001 S_ISREG(le16_to_cpu(raw_inode->i_mode))) 3002 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 3003 le32_to_cpu(raw_inode->i_size_lo); 3004 3005 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 3006 } 3007 3008 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 3009 { 3010 raw_inode->i_size_lo = cpu_to_le32(i_size); 3011 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 3012 } 3013 3014 static inline 3015 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 3016 ext4_group_t group) 3017 { 3018 struct ext4_group_info **grp_info; 3019 long indexv, indexh; 3020 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 3021 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 3022 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 3023 grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv); 3024 return grp_info[indexh]; 3025 } 3026 3027 /* 3028 * Reading s_groups_count requires using smp_rmb() afterwards. See 3029 * the locking protocol documented in the comments of ext4_group_add() 3030 * in resize.c 3031 */ 3032 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 3033 { 3034 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 3035 3036 smp_rmb(); 3037 return ngroups; 3038 } 3039 3040 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 3041 ext4_group_t block_group) 3042 { 3043 return block_group >> sbi->s_log_groups_per_flex; 3044 } 3045 3046 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 3047 { 3048 return 1 << sbi->s_log_groups_per_flex; 3049 } 3050 3051 #define ext4_std_error(sb, errno) \ 3052 do { \ 3053 if ((errno)) \ 3054 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 3055 } while (0) 3056 3057 #ifdef CONFIG_SMP 3058 /* Each CPU can accumulate percpu_counter_batch clusters in their local 3059 * counters. So we need to make sure we have free clusters more 3060 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 3061 */ 3062 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 3063 #else 3064 #define EXT4_FREECLUSTERS_WATERMARK 0 3065 #endif 3066 3067 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 3068 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 3069 { 3070 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 3071 !inode_is_locked(inode)); 3072 down_write(&EXT4_I(inode)->i_data_sem); 3073 if (newsize > EXT4_I(inode)->i_disksize) 3074 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize); 3075 up_write(&EXT4_I(inode)->i_data_sem); 3076 } 3077 3078 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 3079 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 3080 { 3081 int changed = 0; 3082 3083 if (newsize > inode->i_size) { 3084 i_size_write(inode, newsize); 3085 changed = 1; 3086 } 3087 if (newsize > EXT4_I(inode)->i_disksize) { 3088 ext4_update_i_disksize(inode, newsize); 3089 changed |= 2; 3090 } 3091 return changed; 3092 } 3093 3094 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 3095 loff_t len); 3096 3097 struct ext4_group_info { 3098 unsigned long bb_state; 3099 struct rb_root bb_free_root; 3100 ext4_grpblk_t bb_first_free; /* first free block */ 3101 ext4_grpblk_t bb_free; /* total free blocks */ 3102 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 3103 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 3104 struct list_head bb_prealloc_list; 3105 #ifdef DOUBLE_CHECK 3106 void *bb_bitmap; 3107 #endif 3108 struct rw_semaphore alloc_sem; 3109 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 3110 * regions, index is order. 3111 * bb_counters[3] = 5 means 3112 * 5 free 8-block regions. */ 3113 }; 3114 3115 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 3116 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 3117 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 3118 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 3119 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \ 3120 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT) 3121 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \ 3122 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT) 3123 3124 #define EXT4_MB_GRP_NEED_INIT(grp) \ 3125 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 3126 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 3127 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3128 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 3129 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3130 3131 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 3132 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3133 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 3134 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3135 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 3136 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3137 3138 #define EXT4_MAX_CONTENTION 8 3139 #define EXT4_CONTENTION_THRESHOLD 2 3140 3141 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 3142 ext4_group_t group) 3143 { 3144 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 3145 } 3146 3147 /* 3148 * Returns true if the filesystem is busy enough that attempts to 3149 * access the block group locks has run into contention. 3150 */ 3151 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 3152 { 3153 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 3154 } 3155 3156 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 3157 { 3158 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 3159 if (spin_trylock(lock)) 3160 /* 3161 * We're able to grab the lock right away, so drop the 3162 * lock contention counter. 3163 */ 3164 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 3165 else { 3166 /* 3167 * The lock is busy, so bump the contention counter, 3168 * and then wait on the spin lock. 3169 */ 3170 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 3171 EXT4_MAX_CONTENTION); 3172 spin_lock(lock); 3173 } 3174 } 3175 3176 static inline void ext4_unlock_group(struct super_block *sb, 3177 ext4_group_t group) 3178 { 3179 spin_unlock(ext4_group_lock_ptr(sb, group)); 3180 } 3181 3182 /* 3183 * Block validity checking 3184 */ 3185 #define ext4_check_indirect_blockref(inode, bh) \ 3186 ext4_check_blockref(__func__, __LINE__, inode, \ 3187 (__le32 *)(bh)->b_data, \ 3188 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 3189 3190 #define ext4_ind_check_inode(inode) \ 3191 ext4_check_blockref(__func__, __LINE__, inode, \ 3192 EXT4_I(inode)->i_data, \ 3193 EXT4_NDIR_BLOCKS) 3194 3195 /* 3196 * Inodes and files operations 3197 */ 3198 3199 /* dir.c */ 3200 extern const struct file_operations ext4_dir_operations; 3201 3202 #ifdef CONFIG_UNICODE 3203 extern const struct dentry_operations ext4_dentry_ops; 3204 #endif 3205 3206 /* file.c */ 3207 extern const struct inode_operations ext4_file_inode_operations; 3208 extern const struct file_operations ext4_file_operations; 3209 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 3210 3211 /* inline.c */ 3212 extern int ext4_get_max_inline_size(struct inode *inode); 3213 extern int ext4_find_inline_data_nolock(struct inode *inode); 3214 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 3215 unsigned int len); 3216 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 3217 3218 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 3219 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 3220 struct inode *inode, 3221 loff_t pos, unsigned len, 3222 unsigned flags, 3223 struct page **pagep); 3224 extern int ext4_write_inline_data_end(struct inode *inode, 3225 loff_t pos, unsigned len, 3226 unsigned copied, 3227 struct page *page); 3228 extern struct buffer_head * 3229 ext4_journalled_write_inline_data(struct inode *inode, 3230 unsigned len, 3231 struct page *page); 3232 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 3233 struct inode *inode, 3234 loff_t pos, unsigned len, 3235 unsigned flags, 3236 struct page **pagep, 3237 void **fsdata); 3238 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 3239 unsigned len, unsigned copied, 3240 struct page *page); 3241 extern int ext4_try_add_inline_entry(handle_t *handle, 3242 struct ext4_filename *fname, 3243 struct inode *dir, struct inode *inode); 3244 extern int ext4_try_create_inline_dir(handle_t *handle, 3245 struct inode *parent, 3246 struct inode *inode); 3247 extern int ext4_read_inline_dir(struct file *filp, 3248 struct dir_context *ctx, 3249 int *has_inline_data); 3250 extern int ext4_inlinedir_to_tree(struct file *dir_file, 3251 struct inode *dir, ext4_lblk_t block, 3252 struct dx_hash_info *hinfo, 3253 __u32 start_hash, __u32 start_minor_hash, 3254 int *has_inline_data); 3255 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3256 struct ext4_filename *fname, 3257 struct ext4_dir_entry_2 **res_dir, 3258 int *has_inline_data); 3259 extern int ext4_delete_inline_entry(handle_t *handle, 3260 struct inode *dir, 3261 struct ext4_dir_entry_2 *de_del, 3262 struct buffer_head *bh, 3263 int *has_inline_data); 3264 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); 3265 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3266 struct ext4_dir_entry_2 **parent_de, 3267 int *retval); 3268 extern int ext4_inline_data_fiemap(struct inode *inode, 3269 struct fiemap_extent_info *fieinfo, 3270 int *has_inline, __u64 start, __u64 len); 3271 3272 struct iomap; 3273 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap); 3274 3275 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3276 3277 extern int ext4_convert_inline_data(struct inode *inode); 3278 3279 static inline int ext4_has_inline_data(struct inode *inode) 3280 { 3281 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3282 EXT4_I(inode)->i_inline_off; 3283 } 3284 3285 /* namei.c */ 3286 extern const struct inode_operations ext4_dir_inode_operations; 3287 extern const struct inode_operations ext4_special_inode_operations; 3288 extern struct dentry *ext4_get_parent(struct dentry *child); 3289 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3290 struct ext4_dir_entry_2 *de, 3291 int blocksize, int csum_size, 3292 unsigned int parent_ino, int dotdot_real_len); 3293 extern void ext4_initialize_dirent_tail(struct buffer_head *bh, 3294 unsigned int blocksize); 3295 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode, 3296 struct buffer_head *bh); 3297 extern int ext4_ci_compare(const struct inode *parent, 3298 const struct qstr *fname, 3299 const struct qstr *entry, bool quick); 3300 3301 #define S_SHIFT 12 3302 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = { 3303 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3304 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3305 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3306 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3307 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3308 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3309 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3310 }; 3311 3312 static inline void ext4_set_de_type(struct super_block *sb, 3313 struct ext4_dir_entry_2 *de, 3314 umode_t mode) { 3315 if (ext4_has_feature_filetype(sb)) 3316 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3317 } 3318 3319 /* readpages.c */ 3320 extern int ext4_mpage_readpages(struct inode *inode, 3321 struct readahead_control *rac, struct page *page); 3322 extern int __init ext4_init_post_read_processing(void); 3323 extern void ext4_exit_post_read_processing(void); 3324 3325 /* symlink.c */ 3326 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3327 extern const struct inode_operations ext4_symlink_inode_operations; 3328 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3329 3330 /* sysfs.c */ 3331 extern int ext4_register_sysfs(struct super_block *sb); 3332 extern void ext4_unregister_sysfs(struct super_block *sb); 3333 extern int __init ext4_init_sysfs(void); 3334 extern void ext4_exit_sysfs(void); 3335 3336 /* block_validity */ 3337 extern void ext4_release_system_zone(struct super_block *sb); 3338 extern int ext4_setup_system_zone(struct super_block *sb); 3339 extern int __init ext4_init_system_zone(void); 3340 extern void ext4_exit_system_zone(void); 3341 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 3342 ext4_fsblk_t start_blk, 3343 unsigned int count); 3344 extern int ext4_check_blockref(const char *, unsigned int, 3345 struct inode *, __le32 *, unsigned int); 3346 3347 /* extents.c */ 3348 struct ext4_ext_path; 3349 struct ext4_extent; 3350 3351 /* 3352 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3353 * __le32. 3354 */ 3355 #define EXT_MAX_BLOCKS 0xffffffff 3356 3357 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 3358 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3359 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3360 struct ext4_map_blocks *map, int flags); 3361 extern int ext4_ext_truncate(handle_t *, struct inode *); 3362 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3363 ext4_lblk_t end); 3364 extern void ext4_ext_init(struct super_block *); 3365 extern void ext4_ext_release(struct super_block *); 3366 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3367 loff_t len); 3368 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3369 loff_t offset, ssize_t len); 3370 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle, 3371 ext4_io_end_t *io_end); 3372 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3373 struct ext4_map_blocks *map, int flags); 3374 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3375 int num, 3376 struct ext4_ext_path *path); 3377 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3378 struct ext4_ext_path **, 3379 struct ext4_extent *, int); 3380 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3381 struct ext4_ext_path **, 3382 int flags); 3383 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 3384 extern int ext4_ext_check_inode(struct inode *inode); 3385 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3386 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3387 __u64 start, __u64 len); 3388 extern int ext4_get_es_cache(struct inode *inode, 3389 struct fiemap_extent_info *fieinfo, 3390 __u64 start, __u64 len); 3391 extern int ext4_ext_precache(struct inode *inode); 3392 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3393 struct inode *inode2, ext4_lblk_t lblk1, 3394 ext4_lblk_t lblk2, ext4_lblk_t count, 3395 int mark_unwritten,int *err); 3396 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu); 3397 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode, 3398 int check_cred, int restart_cred, 3399 int revoke_cred); 3400 3401 3402 /* move_extent.c */ 3403 extern void ext4_double_down_write_data_sem(struct inode *first, 3404 struct inode *second); 3405 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3406 struct inode *donor_inode); 3407 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3408 __u64 start_orig, __u64 start_donor, 3409 __u64 len, __u64 *moved_len); 3410 3411 /* page-io.c */ 3412 extern int __init ext4_init_pageio(void); 3413 extern void ext4_exit_pageio(void); 3414 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3415 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3416 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3417 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3418 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3419 struct writeback_control *wbc); 3420 extern void ext4_end_io_rsv_work(struct work_struct *work); 3421 extern void ext4_io_submit(struct ext4_io_submit *io); 3422 extern int ext4_bio_write_page(struct ext4_io_submit *io, 3423 struct page *page, 3424 int len, 3425 struct writeback_control *wbc, 3426 bool keep_towrite); 3427 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end); 3428 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end); 3429 3430 /* mmp.c */ 3431 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3432 3433 /* verity.c */ 3434 extern const struct fsverity_operations ext4_verityops; 3435 3436 /* 3437 * Add new method to test whether block and inode bitmaps are properly 3438 * initialized. With uninit_bg reading the block from disk is not enough 3439 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3440 */ 3441 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3442 3443 static inline int bitmap_uptodate(struct buffer_head *bh) 3444 { 3445 return (buffer_uptodate(bh) && 3446 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3447 } 3448 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3449 { 3450 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3451 } 3452 3453 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3454 3455 /* For ioend & aio unwritten conversion wait queues */ 3456 #define EXT4_WQ_HASH_SZ 37 3457 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3458 EXT4_WQ_HASH_SZ]) 3459 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3460 3461 extern int ext4_resize_begin(struct super_block *sb); 3462 extern void ext4_resize_end(struct super_block *sb); 3463 3464 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 3465 struct ext4_io_end *io_end) 3466 { 3467 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 3468 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3469 atomic_inc(&EXT4_I(inode)->i_unwritten); 3470 } 3471 } 3472 3473 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3474 { 3475 struct inode *inode = io_end->inode; 3476 3477 if (io_end->flag & EXT4_IO_END_UNWRITTEN) { 3478 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3479 /* Wake up anyone waiting on unwritten extent conversion */ 3480 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) 3481 wake_up_all(ext4_ioend_wq(inode)); 3482 } 3483 } 3484 3485 extern const struct iomap_ops ext4_iomap_ops; 3486 extern const struct iomap_ops ext4_iomap_overwrite_ops; 3487 extern const struct iomap_ops ext4_iomap_report_ops; 3488 3489 static inline int ext4_buffer_uptodate(struct buffer_head *bh) 3490 { 3491 /* 3492 * If the buffer has the write error flag, we have failed 3493 * to write out data in the block. In this case, we don't 3494 * have to read the block because we may read the old data 3495 * successfully. 3496 */ 3497 if (!buffer_uptodate(bh) && buffer_write_io_error(bh)) 3498 set_buffer_uptodate(bh); 3499 return buffer_uptodate(bh); 3500 } 3501 3502 #endif /* __KERNEL__ */ 3503 3504 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3505 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3506 3507 #endif /* _EXT4_H */ 3508