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 /* 202 * For converting unwritten extents on a work queue. 'handle' is used for 203 * buffered writeback. 204 */ 205 typedef struct ext4_io_end { 206 struct list_head list; /* per-file finished IO list */ 207 handle_t *handle; /* handle reserved for extent 208 * conversion */ 209 struct inode *inode; /* file being written to */ 210 struct bio *bio; /* Linked list of completed 211 * bios covering the extent */ 212 unsigned int flag; /* unwritten or not */ 213 atomic_t count; /* reference counter */ 214 loff_t offset; /* offset in the file */ 215 ssize_t size; /* size of the extent */ 216 } ext4_io_end_t; 217 218 struct ext4_io_submit { 219 struct writeback_control *io_wbc; 220 struct bio *io_bio; 221 ext4_io_end_t *io_end; 222 sector_t io_next_block; 223 }; 224 225 /* 226 * Special inodes numbers 227 */ 228 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 229 #define EXT4_ROOT_INO 2 /* Root inode */ 230 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 231 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 232 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 233 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 234 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 235 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 236 237 /* First non-reserved inode for old ext4 filesystems */ 238 #define EXT4_GOOD_OLD_FIRST_INO 11 239 240 /* 241 * Maximal count of links to a file 242 */ 243 #define EXT4_LINK_MAX 65000 244 245 /* 246 * Macro-instructions used to manage several block sizes 247 */ 248 #define EXT4_MIN_BLOCK_SIZE 1024 249 #define EXT4_MAX_BLOCK_SIZE 65536 250 #define EXT4_MIN_BLOCK_LOG_SIZE 10 251 #define EXT4_MAX_BLOCK_LOG_SIZE 16 252 #define EXT4_MAX_CLUSTER_LOG_SIZE 30 253 #ifdef __KERNEL__ 254 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 255 #else 256 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 257 #endif 258 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 259 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 260 EXT4_SB(s)->s_cluster_bits) 261 #ifdef __KERNEL__ 262 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 263 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 264 #else 265 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 266 #endif 267 #ifdef __KERNEL__ 268 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 269 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 270 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 271 #else 272 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 273 EXT4_GOOD_OLD_INODE_SIZE : \ 274 (s)->s_inode_size) 275 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 276 EXT4_GOOD_OLD_FIRST_INO : \ 277 (s)->s_first_ino) 278 #endif 279 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 280 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \ 281 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \ 282 blkbits)) 283 284 /* Translate a block number to a cluster number */ 285 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 286 /* Translate a cluster number to a block number */ 287 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 288 /* Translate # of blks to # of clusters */ 289 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 290 (sbi)->s_cluster_bits) 291 /* Mask out the low bits to get the starting block of the cluster */ 292 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 293 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 294 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 295 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 296 /* Fill in the low bits to get the last block of the cluster */ 297 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \ 298 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1)) 299 /* Get the cluster offset */ 300 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 301 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 302 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 303 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 304 305 /* 306 * Structure of a blocks group descriptor 307 */ 308 struct ext4_group_desc 309 { 310 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 311 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 312 __le32 bg_inode_table_lo; /* Inodes table block */ 313 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 314 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 315 __le16 bg_used_dirs_count_lo; /* Directories count */ 316 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 317 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 318 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 319 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 320 __le16 bg_itable_unused_lo; /* Unused inodes count */ 321 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 322 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 323 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 324 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 325 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 326 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 327 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 328 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 329 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 330 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 331 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 332 __u32 bg_reserved; 333 }; 334 335 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 336 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 337 sizeof(__le16)) 338 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 339 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 340 sizeof(__le16)) 341 342 /* 343 * Structure of a flex block group info 344 */ 345 346 struct flex_groups { 347 atomic64_t free_clusters; 348 atomic_t free_inodes; 349 atomic_t used_dirs; 350 }; 351 352 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 353 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 354 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 355 356 /* 357 * Macro-instructions used to manage group descriptors 358 */ 359 #define EXT4_MIN_DESC_SIZE 32 360 #define EXT4_MIN_DESC_SIZE_64BIT 64 361 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 362 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 363 #ifdef __KERNEL__ 364 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 365 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 366 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 367 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 368 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 369 #else 370 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 371 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 372 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 373 #endif 374 375 /* 376 * Constants relative to the data blocks 377 */ 378 #define EXT4_NDIR_BLOCKS 12 379 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 380 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 381 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 382 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 383 384 /* 385 * Inode flags 386 */ 387 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 388 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 389 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 390 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 391 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 392 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 393 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 394 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 395 /* Reserved for compression usage... */ 396 #define EXT4_DIRTY_FL 0x00000100 397 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 398 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 399 /* nb: was previously EXT2_ECOMPR_FL */ 400 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 401 /* End compression flags --- maybe not all used */ 402 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 403 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 404 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 405 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 406 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 407 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 408 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 409 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 410 #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */ 411 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 412 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 413 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 414 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 415 #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded file */ 416 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 417 418 #define EXT4_FL_USER_VISIBLE 0x705BDFFF /* User visible flags */ 419 #define EXT4_FL_USER_MODIFIABLE 0x604BC0FF /* User modifiable flags */ 420 421 /* Flags we can manipulate with through EXT4_IOC_FSSETXATTR */ 422 #define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \ 423 EXT4_IMMUTABLE_FL | \ 424 EXT4_APPEND_FL | \ 425 EXT4_NODUMP_FL | \ 426 EXT4_NOATIME_FL | \ 427 EXT4_PROJINHERIT_FL) 428 429 /* Flags that should be inherited by new inodes from their parent. */ 430 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 431 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 432 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 433 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 434 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL) 435 436 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 437 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\ 438 EXT4_PROJINHERIT_FL)) 439 440 /* Flags that are appropriate for non-directories/regular files. */ 441 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 442 443 /* The only flags that should be swapped */ 444 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL) 445 446 /* Mask out flags that are inappropriate for the given type of inode. */ 447 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 448 { 449 if (S_ISDIR(mode)) 450 return flags; 451 else if (S_ISREG(mode)) 452 return flags & EXT4_REG_FLMASK; 453 else 454 return flags & EXT4_OTHER_FLMASK; 455 } 456 457 /* 458 * Inode flags used for atomic set/get 459 */ 460 enum { 461 EXT4_INODE_SECRM = 0, /* Secure deletion */ 462 EXT4_INODE_UNRM = 1, /* Undelete */ 463 EXT4_INODE_COMPR = 2, /* Compress file */ 464 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 465 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 466 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 467 EXT4_INODE_NODUMP = 6, /* do not dump file */ 468 EXT4_INODE_NOATIME = 7, /* do not update atime */ 469 /* Reserved for compression usage... */ 470 EXT4_INODE_DIRTY = 8, 471 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 472 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 473 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 474 /* End compression flags --- maybe not all used */ 475 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 476 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 477 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 478 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 479 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 480 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 481 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 482 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 483 EXT4_INODE_VERITY = 20, /* Verity protected inode */ 484 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 485 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 486 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 487 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 488 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 489 }; 490 491 /* 492 * Since it's pretty easy to mix up bit numbers and hex values, we use a 493 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 494 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 495 * any extra space in the compiled kernel image, otherwise, the build will fail. 496 * It's important that these values are the same, since we are using 497 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 498 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 499 * values found in ext2, ext3 and ext4 filesystems, and of course the values 500 * defined in e2fsprogs. 501 * 502 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 503 */ 504 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 505 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 506 507 static inline void ext4_check_flag_values(void) 508 { 509 CHECK_FLAG_VALUE(SECRM); 510 CHECK_FLAG_VALUE(UNRM); 511 CHECK_FLAG_VALUE(COMPR); 512 CHECK_FLAG_VALUE(SYNC); 513 CHECK_FLAG_VALUE(IMMUTABLE); 514 CHECK_FLAG_VALUE(APPEND); 515 CHECK_FLAG_VALUE(NODUMP); 516 CHECK_FLAG_VALUE(NOATIME); 517 CHECK_FLAG_VALUE(DIRTY); 518 CHECK_FLAG_VALUE(COMPRBLK); 519 CHECK_FLAG_VALUE(NOCOMPR); 520 CHECK_FLAG_VALUE(ENCRYPT); 521 CHECK_FLAG_VALUE(INDEX); 522 CHECK_FLAG_VALUE(IMAGIC); 523 CHECK_FLAG_VALUE(JOURNAL_DATA); 524 CHECK_FLAG_VALUE(NOTAIL); 525 CHECK_FLAG_VALUE(DIRSYNC); 526 CHECK_FLAG_VALUE(TOPDIR); 527 CHECK_FLAG_VALUE(HUGE_FILE); 528 CHECK_FLAG_VALUE(EXTENTS); 529 CHECK_FLAG_VALUE(VERITY); 530 CHECK_FLAG_VALUE(EA_INODE); 531 CHECK_FLAG_VALUE(EOFBLOCKS); 532 CHECK_FLAG_VALUE(INLINE_DATA); 533 CHECK_FLAG_VALUE(PROJINHERIT); 534 CHECK_FLAG_VALUE(RESERVED); 535 } 536 537 /* Used to pass group descriptor data when online resize is done */ 538 struct ext4_new_group_input { 539 __u32 group; /* Group number for this data */ 540 __u64 block_bitmap; /* Absolute block number of block bitmap */ 541 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 542 __u64 inode_table; /* Absolute block number of inode table start */ 543 __u32 blocks_count; /* Total number of blocks in this group */ 544 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 545 __u16 unused; 546 }; 547 548 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 549 struct compat_ext4_new_group_input { 550 u32 group; 551 compat_u64 block_bitmap; 552 compat_u64 inode_bitmap; 553 compat_u64 inode_table; 554 u32 blocks_count; 555 u16 reserved_blocks; 556 u16 unused; 557 }; 558 #endif 559 560 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 561 struct ext4_new_group_data { 562 __u32 group; 563 __u64 block_bitmap; 564 __u64 inode_bitmap; 565 __u64 inode_table; 566 __u32 blocks_count; 567 __u16 reserved_blocks; 568 __u16 mdata_blocks; 569 __u32 free_clusters_count; 570 }; 571 572 /* Indexes used to index group tables in ext4_new_group_data */ 573 enum { 574 BLOCK_BITMAP = 0, /* block bitmap */ 575 INODE_BITMAP, /* inode bitmap */ 576 INODE_TABLE, /* inode tables */ 577 GROUP_TABLE_COUNT, 578 }; 579 580 /* 581 * Flags used by ext4_map_blocks() 582 */ 583 /* Allocate any needed blocks and/or convert an unwritten 584 extent to be an initialized ext4 */ 585 #define EXT4_GET_BLOCKS_CREATE 0x0001 586 /* Request the creation of an unwritten extent */ 587 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 588 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 589 EXT4_GET_BLOCKS_CREATE) 590 /* Caller is from the delayed allocation writeout path 591 * finally doing the actual allocation of delayed blocks */ 592 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 593 /* caller is from the direct IO path, request to creation of an 594 unwritten extents if not allocated, split the unwritten 595 extent if blocks has been preallocated already*/ 596 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 597 #define EXT4_GET_BLOCKS_CONVERT 0x0010 598 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 599 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 600 /* Convert extent to initialized after IO complete */ 601 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 602 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 603 /* Eventual metadata allocation (due to growing extent tree) 604 * should not fail, so try to use reserved blocks for that.*/ 605 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 606 /* Don't normalize allocation size (used for fallocate) */ 607 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 608 /* Request will not result in inode size update (user for fallocate) */ 609 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 610 /* Convert written extents to unwritten */ 611 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 612 /* Write zeros to newly created written extents */ 613 #define EXT4_GET_BLOCKS_ZERO 0x0200 614 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 615 EXT4_GET_BLOCKS_ZERO) 616 /* Caller will submit data before dropping transaction handle. This 617 * allows jbd2 to avoid submitting data before commit. */ 618 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 619 620 /* 621 * The bit position of these flags must not overlap with any of the 622 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 623 * read_extent_tree_block(), ext4_split_extent_at(), 624 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 625 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 626 * caching the extents when reading from the extent tree while a 627 * truncate or punch hole operation is in progress. 628 */ 629 #define EXT4_EX_NOCACHE 0x40000000 630 #define EXT4_EX_FORCE_CACHE 0x20000000 631 632 /* 633 * Flags used by ext4_free_blocks 634 */ 635 #define EXT4_FREE_BLOCKS_METADATA 0x0001 636 #define EXT4_FREE_BLOCKS_FORGET 0x0002 637 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 638 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 639 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 640 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 641 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040 642 643 /* 644 * ioctl commands 645 */ 646 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 647 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 648 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 649 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 650 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 651 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 652 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 653 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 654 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 655 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 656 #define EXT4_IOC_MIGRATE _IO('f', 9) 657 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 658 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 659 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 660 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 661 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 662 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 663 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 664 #define EXT4_IOC_SET_ENCRYPTION_POLICY FS_IOC_SET_ENCRYPTION_POLICY 665 #define EXT4_IOC_GET_ENCRYPTION_PWSALT FS_IOC_GET_ENCRYPTION_PWSALT 666 #define EXT4_IOC_GET_ENCRYPTION_POLICY FS_IOC_GET_ENCRYPTION_POLICY 667 /* ioctl codes 19--39 are reserved for fscrypt */ 668 #define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40) 669 #define EXT4_IOC_GETSTATE _IOW('f', 41, __u32) 670 #define EXT4_IOC_GET_ES_CACHE _IOWR('f', 42, struct fiemap) 671 672 #define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR 673 #define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR 674 675 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32) 676 677 /* 678 * Flags for going down operation 679 */ 680 #define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */ 681 #define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */ 682 #define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */ 683 684 /* 685 * Flags returned by EXT4_IOC_GETSTATE 686 * 687 * We only expose to userspace a subset of the state flags in 688 * i_state_flags 689 */ 690 #define EXT4_STATE_FLAG_EXT_PRECACHED 0x00000001 691 #define EXT4_STATE_FLAG_NEW 0x00000002 692 #define EXT4_STATE_FLAG_NEWENTRY 0x00000004 693 #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE 0x00000008 694 695 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 696 /* 697 * ioctl commands in 32 bit emulation 698 */ 699 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 700 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 701 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 702 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 703 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 704 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 705 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 706 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 707 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 708 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 709 #endif 710 711 /* 712 * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag. 713 * It indicates that the entry in extent status cache is for a hole. 714 */ 715 #define EXT4_FIEMAP_EXTENT_HOLE 0x08000000 716 717 /* Max physical block we can address w/o extents */ 718 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 719 720 /* Max logical block we can support */ 721 #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFF 722 723 /* 724 * Structure of an inode on the disk 725 */ 726 struct ext4_inode { 727 __le16 i_mode; /* File mode */ 728 __le16 i_uid; /* Low 16 bits of Owner Uid */ 729 __le32 i_size_lo; /* Size in bytes */ 730 __le32 i_atime; /* Access time */ 731 __le32 i_ctime; /* Inode Change time */ 732 __le32 i_mtime; /* Modification time */ 733 __le32 i_dtime; /* Deletion Time */ 734 __le16 i_gid; /* Low 16 bits of Group Id */ 735 __le16 i_links_count; /* Links count */ 736 __le32 i_blocks_lo; /* Blocks count */ 737 __le32 i_flags; /* File flags */ 738 union { 739 struct { 740 __le32 l_i_version; 741 } linux1; 742 struct { 743 __u32 h_i_translator; 744 } hurd1; 745 struct { 746 __u32 m_i_reserved1; 747 } masix1; 748 } osd1; /* OS dependent 1 */ 749 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 750 __le32 i_generation; /* File version (for NFS) */ 751 __le32 i_file_acl_lo; /* File ACL */ 752 __le32 i_size_high; 753 __le32 i_obso_faddr; /* Obsoleted fragment address */ 754 union { 755 struct { 756 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 757 __le16 l_i_file_acl_high; 758 __le16 l_i_uid_high; /* these 2 fields */ 759 __le16 l_i_gid_high; /* were reserved2[0] */ 760 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 761 __le16 l_i_reserved; 762 } linux2; 763 struct { 764 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 765 __u16 h_i_mode_high; 766 __u16 h_i_uid_high; 767 __u16 h_i_gid_high; 768 __u32 h_i_author; 769 } hurd2; 770 struct { 771 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 772 __le16 m_i_file_acl_high; 773 __u32 m_i_reserved2[2]; 774 } masix2; 775 } osd2; /* OS dependent 2 */ 776 __le16 i_extra_isize; 777 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 778 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 779 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 780 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 781 __le32 i_crtime; /* File Creation time */ 782 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 783 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 784 __le32 i_projid; /* Project ID */ 785 }; 786 787 struct move_extent { 788 __u32 reserved; /* should be zero */ 789 __u32 donor_fd; /* donor file descriptor */ 790 __u64 orig_start; /* logical start offset in block for orig */ 791 __u64 donor_start; /* logical start offset in block for donor */ 792 __u64 len; /* block length to be moved */ 793 __u64 moved_len; /* moved block length */ 794 }; 795 796 #define EXT4_EPOCH_BITS 2 797 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 798 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 799 800 /* 801 * Extended fields will fit into an inode if the filesystem was formatted 802 * with large inodes (-I 256 or larger) and there are not currently any EAs 803 * consuming all of the available space. For new inodes we always reserve 804 * enough space for the kernel's known extended fields, but for inodes 805 * created with an old kernel this might not have been the case. None of 806 * the extended inode fields is critical for correct filesystem operation. 807 * This macro checks if a certain field fits in the inode. Note that 808 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 809 */ 810 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 811 ((offsetof(typeof(*ext4_inode), field) + \ 812 sizeof((ext4_inode)->field)) \ 813 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 814 (einode)->i_extra_isize)) \ 815 816 /* 817 * We use an encoding that preserves the times for extra epoch "00": 818 * 819 * extra msb of adjust for signed 820 * epoch 32-bit 32-bit tv_sec to 821 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 822 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 823 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 824 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 825 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 826 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 827 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 828 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 829 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 830 * 831 * Note that previous versions of the kernel on 64-bit systems would 832 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 833 * 1970. e2fsck will correct this, assuming that it is run on the 834 * affected filesystem before 2242. 835 */ 836 837 static inline __le32 ext4_encode_extra_time(struct timespec64 *time) 838 { 839 u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK; 840 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); 841 } 842 843 static inline void ext4_decode_extra_time(struct timespec64 *time, 844 __le32 extra) 845 { 846 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) 847 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 848 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 849 } 850 851 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 852 do { \ 853 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\ 854 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 855 (raw_inode)->xtime ## _extra = \ 856 ext4_encode_extra_time(&(inode)->xtime); \ 857 } \ 858 else \ 859 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX)); \ 860 } while (0) 861 862 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 863 do { \ 864 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 865 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 866 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 867 (raw_inode)->xtime ## _extra = \ 868 ext4_encode_extra_time(&(einode)->xtime); \ 869 } while (0) 870 871 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 872 do { \ 873 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 874 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \ 875 ext4_decode_extra_time(&(inode)->xtime, \ 876 raw_inode->xtime ## _extra); \ 877 } \ 878 else \ 879 (inode)->xtime.tv_nsec = 0; \ 880 } while (0) 881 882 883 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 884 do { \ 885 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 886 (einode)->xtime.tv_sec = \ 887 (signed)le32_to_cpu((raw_inode)->xtime); \ 888 else \ 889 (einode)->xtime.tv_sec = 0; \ 890 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 891 ext4_decode_extra_time(&(einode)->xtime, \ 892 raw_inode->xtime ## _extra); \ 893 else \ 894 (einode)->xtime.tv_nsec = 0; \ 895 } while (0) 896 897 #define i_disk_version osd1.linux1.l_i_version 898 899 #if defined(__KERNEL__) || defined(__linux__) 900 #define i_reserved1 osd1.linux1.l_i_reserved1 901 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 902 #define i_blocks_high osd2.linux2.l_i_blocks_high 903 #define i_uid_low i_uid 904 #define i_gid_low i_gid 905 #define i_uid_high osd2.linux2.l_i_uid_high 906 #define i_gid_high osd2.linux2.l_i_gid_high 907 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 908 909 #elif defined(__GNU__) 910 911 #define i_translator osd1.hurd1.h_i_translator 912 #define i_uid_high osd2.hurd2.h_i_uid_high 913 #define i_gid_high osd2.hurd2.h_i_gid_high 914 #define i_author osd2.hurd2.h_i_author 915 916 #elif defined(__masix__) 917 918 #define i_reserved1 osd1.masix1.m_i_reserved1 919 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 920 #define i_reserved2 osd2.masix2.m_i_reserved2 921 922 #endif /* defined(__KERNEL__) || defined(__linux__) */ 923 924 #include "extents_status.h" 925 926 /* 927 * Lock subclasses for i_data_sem in the ext4_inode_info structure. 928 * 929 * These are needed to avoid lockdep false positives when we need to 930 * allocate blocks to the quota inode during ext4_map_blocks(), while 931 * holding i_data_sem for a normal (non-quota) inode. Since we don't 932 * do quota tracking for the quota inode, this avoids deadlock (as 933 * well as infinite recursion, since it isn't turtles all the way 934 * down...) 935 * 936 * I_DATA_SEM_NORMAL - Used for most inodes 937 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode 938 * where the second inode has larger inode number 939 * than the first 940 * I_DATA_SEM_QUOTA - Used for quota inodes only 941 */ 942 enum { 943 I_DATA_SEM_NORMAL = 0, 944 I_DATA_SEM_OTHER, 945 I_DATA_SEM_QUOTA, 946 }; 947 948 949 /* 950 * fourth extended file system inode data in memory 951 */ 952 struct ext4_inode_info { 953 __le32 i_data[15]; /* unconverted */ 954 __u32 i_dtime; 955 ext4_fsblk_t i_file_acl; 956 957 /* 958 * i_block_group is the number of the block group which contains 959 * this file's inode. Constant across the lifetime of the inode, 960 * it is used for making block allocation decisions - we try to 961 * place a file's data blocks near its inode block, and new inodes 962 * near to their parent directory's inode. 963 */ 964 ext4_group_t i_block_group; 965 ext4_lblk_t i_dir_start_lookup; 966 #if (BITS_PER_LONG < 64) 967 unsigned long i_state_flags; /* Dynamic state flags */ 968 #endif 969 unsigned long i_flags; 970 971 /* 972 * Extended attributes can be read independently of the main file 973 * data. Taking i_mutex even when reading would cause contention 974 * between readers of EAs and writers of regular file data, so 975 * instead we synchronize on xattr_sem when reading or changing 976 * EAs. 977 */ 978 struct rw_semaphore xattr_sem; 979 980 struct list_head i_orphan; /* unlinked but open inodes */ 981 982 /* 983 * i_disksize keeps track of what the inode size is ON DISK, not 984 * in memory. During truncate, i_size is set to the new size by 985 * the VFS prior to calling ext4_truncate(), but the filesystem won't 986 * set i_disksize to 0 until the truncate is actually under way. 987 * 988 * The intent is that i_disksize always represents the blocks which 989 * are used by this file. This allows recovery to restart truncate 990 * on orphans if we crash during truncate. We actually write i_disksize 991 * into the on-disk inode when writing inodes out, instead of i_size. 992 * 993 * The only time when i_disksize and i_size may be different is when 994 * a truncate is in progress. The only things which change i_disksize 995 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 996 */ 997 loff_t i_disksize; 998 999 /* 1000 * i_data_sem is for serialising ext4_truncate() against 1001 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 1002 * data tree are chopped off during truncate. We can't do that in 1003 * ext4 because whenever we perform intermediate commits during 1004 * truncate, the inode and all the metadata blocks *must* be in a 1005 * consistent state which allows truncation of the orphans to restart 1006 * during recovery. Hence we must fix the get_block-vs-truncate race 1007 * by other means, so we have i_data_sem. 1008 */ 1009 struct rw_semaphore i_data_sem; 1010 /* 1011 * i_mmap_sem is for serializing page faults with truncate / punch hole 1012 * operations. We have to make sure that new page cannot be faulted in 1013 * a section of the inode that is being punched. We cannot easily use 1014 * i_data_sem for this since we need protection for the whole punch 1015 * operation and i_data_sem ranks below transaction start so we have 1016 * to occasionally drop it. 1017 */ 1018 struct rw_semaphore i_mmap_sem; 1019 struct inode vfs_inode; 1020 struct jbd2_inode *jinode; 1021 1022 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 1023 1024 /* 1025 * File creation time. Its function is same as that of 1026 * struct timespec64 i_{a,c,m}time in the generic inode. 1027 */ 1028 struct timespec64 i_crtime; 1029 1030 /* mballoc */ 1031 struct list_head i_prealloc_list; 1032 spinlock_t i_prealloc_lock; 1033 1034 /* extents status tree */ 1035 struct ext4_es_tree i_es_tree; 1036 rwlock_t i_es_lock; 1037 struct list_head i_es_list; 1038 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1039 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1040 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1041 extents to shrink. Protected by 1042 i_es_lock */ 1043 1044 /* ialloc */ 1045 ext4_group_t i_last_alloc_group; 1046 1047 /* allocation reservation info for delalloc */ 1048 /* In case of bigalloc, this refer to clusters rather than blocks */ 1049 unsigned int i_reserved_data_blocks; 1050 ext4_lblk_t i_da_metadata_calc_last_lblock; 1051 int i_da_metadata_calc_len; 1052 1053 /* pending cluster reservations for bigalloc file systems */ 1054 struct ext4_pending_tree i_pending_tree; 1055 1056 /* on-disk additional length */ 1057 __u16 i_extra_isize; 1058 1059 /* Indicate the inline data space. */ 1060 u16 i_inline_off; 1061 u16 i_inline_size; 1062 1063 #ifdef CONFIG_QUOTA 1064 /* quota space reservation, managed internally by quota code */ 1065 qsize_t i_reserved_quota; 1066 #endif 1067 1068 /* Lock protecting lists below */ 1069 spinlock_t i_completed_io_lock; 1070 /* 1071 * Completed IOs that need unwritten extents handling and have 1072 * transaction reserved 1073 */ 1074 struct list_head i_rsv_conversion_list; 1075 struct work_struct i_rsv_conversion_work; 1076 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 1077 1078 spinlock_t i_block_reservation_lock; 1079 1080 /* 1081 * Transactions that contain inode's metadata needed to complete 1082 * fsync and fdatasync, respectively. 1083 */ 1084 tid_t i_sync_tid; 1085 tid_t i_datasync_tid; 1086 1087 #ifdef CONFIG_QUOTA 1088 struct dquot *i_dquot[MAXQUOTAS]; 1089 #endif 1090 1091 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1092 __u32 i_csum_seed; 1093 1094 kprojid_t i_projid; 1095 }; 1096 1097 /* 1098 * File system states 1099 */ 1100 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1101 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1102 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1103 1104 /* 1105 * Misc. filesystem flags 1106 */ 1107 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1108 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1109 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1110 1111 /* 1112 * Mount flags set via mount options or defaults 1113 */ 1114 #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */ 1115 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1116 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1117 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1118 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1119 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1120 #define EXT4_MOUNT_ERRORS_MASK 0x00070 1121 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1122 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1123 #ifdef CONFIG_FS_DAX 1124 #define EXT4_MOUNT_DAX 0x00200 /* Direct Access */ 1125 #else 1126 #define EXT4_MOUNT_DAX 0 1127 #endif 1128 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1129 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1130 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1131 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1132 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1133 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1134 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1135 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1136 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1137 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1138 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */ 1139 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota, 1140 * enable enforcement for hidden 1141 * quota files */ 1142 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable 1143 * enforcement for hidden quota 1144 * files */ 1145 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota 1146 * enforcement */ 1147 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1148 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1149 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1150 #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */ 1151 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1152 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1153 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1154 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1155 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1156 1157 /* 1158 * Mount flags set either automatically (could not be set by mount option) 1159 * based on per file system feature or property or in special cases such as 1160 * distinguishing between explicit mount option definition and default. 1161 */ 1162 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1163 specified delalloc */ 1164 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1165 size of blocksize * 8 1166 blocks */ 1167 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1168 file systems */ 1169 1170 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1171 specified journal checksum */ 1172 1173 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1174 ~EXT4_MOUNT_##opt 1175 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1176 EXT4_MOUNT_##opt 1177 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1178 EXT4_MOUNT_##opt) 1179 1180 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1181 ~EXT4_MOUNT2_##opt 1182 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1183 EXT4_MOUNT2_##opt 1184 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1185 EXT4_MOUNT2_##opt) 1186 1187 #define ext4_test_and_set_bit __test_and_set_bit_le 1188 #define ext4_set_bit __set_bit_le 1189 #define ext4_set_bit_atomic ext2_set_bit_atomic 1190 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1191 #define ext4_clear_bit __clear_bit_le 1192 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1193 #define ext4_test_bit test_bit_le 1194 #define ext4_find_next_zero_bit find_next_zero_bit_le 1195 #define ext4_find_next_bit find_next_bit_le 1196 1197 extern void ext4_set_bits(void *bm, int cur, int len); 1198 1199 /* 1200 * Maximal mount counts between two filesystem checks 1201 */ 1202 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1203 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1204 1205 /* 1206 * Behaviour when detecting errors 1207 */ 1208 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1209 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1210 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1211 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1212 1213 /* Metadata checksum algorithm codes */ 1214 #define EXT4_CRC32C_CHKSUM 1 1215 1216 /* 1217 * Structure of the super block 1218 */ 1219 struct ext4_super_block { 1220 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1221 __le32 s_blocks_count_lo; /* Blocks count */ 1222 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1223 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1224 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1225 __le32 s_first_data_block; /* First Data Block */ 1226 __le32 s_log_block_size; /* Block size */ 1227 __le32 s_log_cluster_size; /* Allocation cluster size */ 1228 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1229 __le32 s_clusters_per_group; /* # Clusters per group */ 1230 __le32 s_inodes_per_group; /* # Inodes per group */ 1231 __le32 s_mtime; /* Mount time */ 1232 /*30*/ __le32 s_wtime; /* Write time */ 1233 __le16 s_mnt_count; /* Mount count */ 1234 __le16 s_max_mnt_count; /* Maximal mount count */ 1235 __le16 s_magic; /* Magic signature */ 1236 __le16 s_state; /* File system state */ 1237 __le16 s_errors; /* Behaviour when detecting errors */ 1238 __le16 s_minor_rev_level; /* minor revision level */ 1239 /*40*/ __le32 s_lastcheck; /* time of last check */ 1240 __le32 s_checkinterval; /* max. time between checks */ 1241 __le32 s_creator_os; /* OS */ 1242 __le32 s_rev_level; /* Revision level */ 1243 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1244 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1245 /* 1246 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1247 * 1248 * Note: the difference between the compatible feature set and 1249 * the incompatible feature set is that if there is a bit set 1250 * in the incompatible feature set that the kernel doesn't 1251 * know about, it should refuse to mount the filesystem. 1252 * 1253 * e2fsck's requirements are more strict; if it doesn't know 1254 * about a feature in either the compatible or incompatible 1255 * feature set, it must abort and not try to meddle with 1256 * things it doesn't understand... 1257 */ 1258 __le32 s_first_ino; /* First non-reserved inode */ 1259 __le16 s_inode_size; /* size of inode structure */ 1260 __le16 s_block_group_nr; /* block group # of this superblock */ 1261 __le32 s_feature_compat; /* compatible feature set */ 1262 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1263 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1264 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1265 /*78*/ char s_volume_name[16]; /* volume name */ 1266 /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */ 1267 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1268 /* 1269 * Performance hints. Directory preallocation should only 1270 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1271 */ 1272 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1273 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1274 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1275 /* 1276 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1277 */ 1278 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1279 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1280 __le32 s_journal_dev; /* device number of journal file */ 1281 __le32 s_last_orphan; /* start of list of inodes to delete */ 1282 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1283 __u8 s_def_hash_version; /* Default hash version to use */ 1284 __u8 s_jnl_backup_type; 1285 __le16 s_desc_size; /* size of group descriptor */ 1286 /*100*/ __le32 s_default_mount_opts; 1287 __le32 s_first_meta_bg; /* First metablock block group */ 1288 __le32 s_mkfs_time; /* When the filesystem was created */ 1289 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1290 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1291 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1292 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1293 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1294 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1295 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1296 __le32 s_flags; /* Miscellaneous flags */ 1297 __le16 s_raid_stride; /* RAID stride */ 1298 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1299 __le64 s_mmp_block; /* Block for multi-mount protection */ 1300 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1301 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1302 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1303 __u8 s_encryption_level; /* versioning level for encryption */ 1304 __u8 s_reserved_pad; /* Padding to next 32bits */ 1305 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1306 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1307 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1308 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1309 snapshot's future use */ 1310 __le32 s_snapshot_list; /* inode number of the head of the 1311 on-disk snapshot list */ 1312 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1313 __le32 s_error_count; /* number of fs errors */ 1314 __le32 s_first_error_time; /* first time an error happened */ 1315 __le32 s_first_error_ino; /* inode involved in first error */ 1316 __le64 s_first_error_block; /* block involved of first error */ 1317 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */ 1318 __le32 s_first_error_line; /* line number where error happened */ 1319 __le32 s_last_error_time; /* most recent time of an error */ 1320 __le32 s_last_error_ino; /* inode involved in last error */ 1321 __le32 s_last_error_line; /* line number where error happened */ 1322 __le64 s_last_error_block; /* block involved of last error */ 1323 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */ 1324 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1325 __u8 s_mount_opts[64]; 1326 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1327 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1328 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1329 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1330 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1331 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1332 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1333 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1334 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1335 __u8 s_wtime_hi; 1336 __u8 s_mtime_hi; 1337 __u8 s_mkfs_time_hi; 1338 __u8 s_lastcheck_hi; 1339 __u8 s_first_error_time_hi; 1340 __u8 s_last_error_time_hi; 1341 __u8 s_pad[2]; 1342 __le16 s_encoding; /* Filename charset encoding */ 1343 __le16 s_encoding_flags; /* Filename charset encoding flags */ 1344 __le32 s_reserved[95]; /* Padding to the end of the block */ 1345 __le32 s_checksum; /* crc32c(superblock) */ 1346 }; 1347 1348 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1349 1350 #ifdef __KERNEL__ 1351 1352 /* 1353 * run-time mount flags 1354 */ 1355 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1356 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1357 #define EXT4_MF_TEST_DUMMY_ENCRYPTION 0x0004 1358 1359 #ifdef CONFIG_FS_ENCRYPTION 1360 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \ 1361 EXT4_MF_TEST_DUMMY_ENCRYPTION)) 1362 #else 1363 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0) 1364 #endif 1365 1366 /* Number of quota types we support */ 1367 #define EXT4_MAXQUOTAS 3 1368 1369 #define EXT4_ENC_UTF8_12_1 1 1370 1371 /* 1372 * Flags for ext4_sb_info.s_encoding_flags. 1373 */ 1374 #define EXT4_ENC_STRICT_MODE_FL (1 << 0) 1375 1376 #define ext4_has_strict_mode(sbi) \ 1377 (sbi->s_encoding_flags & EXT4_ENC_STRICT_MODE_FL) 1378 1379 /* 1380 * fourth extended-fs super-block data in memory 1381 */ 1382 struct ext4_sb_info { 1383 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1384 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1385 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1386 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1387 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1388 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1389 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1390 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1391 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1392 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1393 unsigned long s_overhead; /* # of fs overhead clusters */ 1394 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1395 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1396 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1397 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1398 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1399 struct buffer_head **s_group_desc; 1400 unsigned int s_mount_opt; 1401 unsigned int s_mount_opt2; 1402 unsigned int s_mount_flags; 1403 unsigned int s_def_mount_opt; 1404 ext4_fsblk_t s_sb_block; 1405 atomic64_t s_resv_clusters; 1406 kuid_t s_resuid; 1407 kgid_t s_resgid; 1408 unsigned short s_mount_state; 1409 unsigned short s_pad; 1410 int s_addr_per_block_bits; 1411 int s_desc_per_block_bits; 1412 int s_inode_size; 1413 int s_first_ino; 1414 unsigned int s_inode_readahead_blks; 1415 unsigned int s_inode_goal; 1416 u32 s_hash_seed[4]; 1417 int s_def_hash_version; 1418 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1419 struct percpu_counter s_freeclusters_counter; 1420 struct percpu_counter s_freeinodes_counter; 1421 struct percpu_counter s_dirs_counter; 1422 struct percpu_counter s_dirtyclusters_counter; 1423 struct blockgroup_lock *s_blockgroup_lock; 1424 struct proc_dir_entry *s_proc; 1425 struct kobject s_kobj; 1426 struct completion s_kobj_unregister; 1427 struct super_block *s_sb; 1428 #ifdef CONFIG_UNICODE 1429 struct unicode_map *s_encoding; 1430 __u16 s_encoding_flags; 1431 #endif 1432 1433 /* Journaling */ 1434 struct journal_s *s_journal; 1435 struct list_head s_orphan; 1436 struct mutex s_orphan_lock; 1437 unsigned long s_ext4_flags; /* Ext4 superblock flags */ 1438 unsigned long s_commit_interval; 1439 u32 s_max_batch_time; 1440 u32 s_min_batch_time; 1441 struct block_device *journal_bdev; 1442 #ifdef CONFIG_QUOTA 1443 /* Names of quota files with journalled quota */ 1444 char __rcu *s_qf_names[EXT4_MAXQUOTAS]; 1445 int s_jquota_fmt; /* Format of quota to use */ 1446 #endif 1447 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1448 struct ext4_system_blocks __rcu *system_blks; 1449 1450 #ifdef EXTENTS_STATS 1451 /* ext4 extents stats */ 1452 unsigned long s_ext_min; 1453 unsigned long s_ext_max; 1454 unsigned long s_depth_max; 1455 spinlock_t s_ext_stats_lock; 1456 unsigned long s_ext_blocks; 1457 unsigned long s_ext_extents; 1458 #endif 1459 1460 /* for buddy allocator */ 1461 struct ext4_group_info ***s_group_info; 1462 struct inode *s_buddy_cache; 1463 spinlock_t s_md_lock; 1464 unsigned short *s_mb_offsets; 1465 unsigned int *s_mb_maxs; 1466 unsigned int s_group_info_size; 1467 unsigned int s_mb_free_pending; 1468 struct list_head s_freed_data_list; /* List of blocks to be freed 1469 after commit completed */ 1470 1471 /* tunables */ 1472 unsigned long s_stripe; 1473 unsigned int s_mb_stream_request; 1474 unsigned int s_mb_max_to_scan; 1475 unsigned int s_mb_min_to_scan; 1476 unsigned int s_mb_stats; 1477 unsigned int s_mb_order2_reqs; 1478 unsigned int s_mb_group_prealloc; 1479 unsigned int s_max_dir_size_kb; 1480 /* where last allocation was done - for stream allocation */ 1481 unsigned long s_mb_last_group; 1482 unsigned long s_mb_last_start; 1483 1484 /* stats for buddy allocator */ 1485 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1486 atomic_t s_bal_success; /* we found long enough chunks */ 1487 atomic_t s_bal_allocated; /* in blocks */ 1488 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1489 atomic_t s_bal_goals; /* goal hits */ 1490 atomic_t s_bal_breaks; /* too long searches */ 1491 atomic_t s_bal_2orders; /* 2^order hits */ 1492 spinlock_t s_bal_lock; 1493 unsigned long s_mb_buddies_generated; 1494 unsigned long long s_mb_generation_time; 1495 atomic_t s_mb_lost_chunks; 1496 atomic_t s_mb_preallocated; 1497 atomic_t s_mb_discarded; 1498 atomic_t s_lock_busy; 1499 1500 /* locality groups */ 1501 struct ext4_locality_group __percpu *s_locality_groups; 1502 1503 /* for write statistics */ 1504 unsigned long s_sectors_written_start; 1505 u64 s_kbytes_written; 1506 1507 /* the size of zero-out chunk */ 1508 unsigned int s_extent_max_zeroout_kb; 1509 1510 unsigned int s_log_groups_per_flex; 1511 struct flex_groups *s_flex_groups; 1512 ext4_group_t s_flex_groups_allocated; 1513 1514 /* workqueue for reserved extent conversions (buffered io) */ 1515 struct workqueue_struct *rsv_conversion_wq; 1516 1517 /* timer for periodic error stats printing */ 1518 struct timer_list s_err_report; 1519 1520 /* Lazy inode table initialization info */ 1521 struct ext4_li_request *s_li_request; 1522 /* Wait multiplier for lazy initialization thread */ 1523 unsigned int s_li_wait_mult; 1524 1525 /* Kernel thread for multiple mount protection */ 1526 struct task_struct *s_mmp_tsk; 1527 1528 /* record the last minlen when FITRIM is called. */ 1529 atomic_t s_last_trim_minblks; 1530 1531 /* Reference to checksum algorithm driver via cryptoapi */ 1532 struct crypto_shash *s_chksum_driver; 1533 1534 /* Precomputed FS UUID checksum for seeding other checksums */ 1535 __u32 s_csum_seed; 1536 1537 /* Reclaim extents from extent status tree */ 1538 struct shrinker s_es_shrinker; 1539 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1540 long s_es_nr_inode; 1541 struct ext4_es_stats s_es_stats; 1542 struct mb_cache *s_ea_block_cache; 1543 struct mb_cache *s_ea_inode_cache; 1544 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1545 1546 /* Ratelimit ext4 messages. */ 1547 struct ratelimit_state s_err_ratelimit_state; 1548 struct ratelimit_state s_warning_ratelimit_state; 1549 struct ratelimit_state s_msg_ratelimit_state; 1550 1551 /* Barrier between changing inodes' journal flags and writepages ops. */ 1552 struct percpu_rw_semaphore s_journal_flag_rwsem; 1553 struct dax_device *s_daxdev; 1554 }; 1555 1556 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1557 { 1558 return sb->s_fs_info; 1559 } 1560 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1561 { 1562 return container_of(inode, struct ext4_inode_info, vfs_inode); 1563 } 1564 1565 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1566 { 1567 return ino == EXT4_ROOT_INO || 1568 (ino >= EXT4_FIRST_INO(sb) && 1569 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1570 } 1571 1572 /* 1573 * Inode dynamic state flags 1574 */ 1575 enum { 1576 EXT4_STATE_JDATA, /* journaled data exists */ 1577 EXT4_STATE_NEW, /* inode is newly created */ 1578 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1579 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1580 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1581 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1582 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1583 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1584 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1585 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1586 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */ 1587 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */ 1588 }; 1589 1590 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1591 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1592 { \ 1593 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1594 } \ 1595 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1596 { \ 1597 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1598 } \ 1599 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1600 { \ 1601 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1602 } 1603 1604 /* Add these declarations here only so that these functions can be 1605 * found by name. Otherwise, they are very hard to locate. */ 1606 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1607 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1608 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1609 EXT4_INODE_BIT_FNS(flag, flags, 0) 1610 1611 /* Add these declarations here only so that these functions can be 1612 * found by name. Otherwise, they are very hard to locate. */ 1613 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1614 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1615 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1616 #if (BITS_PER_LONG < 64) 1617 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1618 1619 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1620 { 1621 (ei)->i_state_flags = 0; 1622 } 1623 #else 1624 EXT4_INODE_BIT_FNS(state, flags, 32) 1625 1626 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1627 { 1628 /* We depend on the fact that callers will set i_flags */ 1629 } 1630 #endif 1631 #else 1632 /* Assume that user mode programs are passing in an ext4fs superblock, not 1633 * a kernel struct super_block. This will allow us to call the feature-test 1634 * macros from user land. */ 1635 #define EXT4_SB(sb) (sb) 1636 #endif 1637 1638 static inline bool ext4_verity_in_progress(struct inode *inode) 1639 { 1640 return IS_ENABLED(CONFIG_FS_VERITY) && 1641 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS); 1642 } 1643 1644 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1645 1646 /* 1647 * Codes for operating systems 1648 */ 1649 #define EXT4_OS_LINUX 0 1650 #define EXT4_OS_HURD 1 1651 #define EXT4_OS_MASIX 2 1652 #define EXT4_OS_FREEBSD 3 1653 #define EXT4_OS_LITES 4 1654 1655 /* 1656 * Revision levels 1657 */ 1658 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1659 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1660 1661 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1662 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1663 1664 #define EXT4_GOOD_OLD_INODE_SIZE 128 1665 1666 #define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN) 1667 #define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX 1668 #define EXT4_TIMESTAMP_MIN S32_MIN 1669 1670 /* 1671 * Feature set definitions 1672 */ 1673 1674 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1675 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1676 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1677 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1678 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1679 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1680 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1681 #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800 1682 1683 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1684 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1685 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1686 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1687 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1688 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1689 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1690 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1691 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1692 /* 1693 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1694 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1695 * all other data structures' checksums. However, the METADATA_CSUM and 1696 * GDT_CSUM bits are mutually exclusive. 1697 */ 1698 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1699 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1700 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 1701 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000 1702 1703 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1704 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1705 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1706 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1707 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1708 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1709 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1710 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1711 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1712 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1713 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1714 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 1715 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1716 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1717 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1718 #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000 1719 1720 extern void ext4_update_dynamic_rev(struct super_block *sb); 1721 1722 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 1723 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1724 { \ 1725 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1726 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 1727 } \ 1728 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1729 { \ 1730 ext4_update_dynamic_rev(sb); \ 1731 EXT4_SB(sb)->s_es->s_feature_compat |= \ 1732 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1733 } \ 1734 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1735 { \ 1736 EXT4_SB(sb)->s_es->s_feature_compat &= \ 1737 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1738 } 1739 1740 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 1741 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1742 { \ 1743 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1744 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 1745 } \ 1746 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1747 { \ 1748 ext4_update_dynamic_rev(sb); \ 1749 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 1750 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1751 } \ 1752 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1753 { \ 1754 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 1755 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1756 } 1757 1758 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 1759 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1760 { \ 1761 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1762 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 1763 } \ 1764 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1765 { \ 1766 ext4_update_dynamic_rev(sb); \ 1767 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 1768 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1769 } \ 1770 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1771 { \ 1772 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 1773 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1774 } 1775 1776 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 1777 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 1778 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 1779 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 1780 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 1781 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 1782 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 1783 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES) 1784 1785 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 1786 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 1787 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 1788 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 1789 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 1790 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 1791 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 1792 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 1793 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 1794 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 1795 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 1796 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 1797 EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY) 1798 1799 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 1800 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 1801 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 1802 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 1803 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 1804 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 1805 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 1806 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 1807 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 1808 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 1809 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 1810 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 1811 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 1812 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 1813 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 1814 EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD) 1815 1816 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1817 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1818 EXT4_FEATURE_INCOMPAT_META_BG) 1819 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1820 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1821 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1822 1823 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1824 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1825 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1826 EXT4_FEATURE_INCOMPAT_META_BG) 1827 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1828 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1829 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1830 1831 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1832 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1833 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1834 EXT4_FEATURE_INCOMPAT_META_BG| \ 1835 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1836 EXT4_FEATURE_INCOMPAT_64BIT| \ 1837 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1838 EXT4_FEATURE_INCOMPAT_EA_INODE| \ 1839 EXT4_FEATURE_INCOMPAT_MMP | \ 1840 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 1841 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 1842 EXT4_FEATURE_INCOMPAT_CASEFOLD | \ 1843 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \ 1844 EXT4_FEATURE_INCOMPAT_LARGEDIR) 1845 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1846 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1847 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1848 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1849 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1850 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1851 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1852 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1853 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1854 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 1855 EXT4_FEATURE_RO_COMPAT_PROJECT |\ 1856 EXT4_FEATURE_RO_COMPAT_VERITY) 1857 1858 #define EXTN_FEATURE_FUNCS(ver) \ 1859 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 1860 { \ 1861 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1862 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 1863 } \ 1864 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 1865 { \ 1866 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1867 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 1868 } \ 1869 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 1870 { \ 1871 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1872 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 1873 } 1874 1875 EXTN_FEATURE_FUNCS(2) 1876 EXTN_FEATURE_FUNCS(3) 1877 EXTN_FEATURE_FUNCS(4) 1878 1879 static inline bool ext4_has_compat_features(struct super_block *sb) 1880 { 1881 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 1882 } 1883 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 1884 { 1885 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 1886 } 1887 static inline bool ext4_has_incompat_features(struct super_block *sb) 1888 { 1889 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 1890 } 1891 1892 /* 1893 * Superblock flags 1894 */ 1895 #define EXT4_FLAGS_RESIZING 0 1896 #define EXT4_FLAGS_SHUTDOWN 1 1897 1898 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi) 1899 { 1900 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 1901 } 1902 1903 1904 /* 1905 * Default values for user and/or group using reserved blocks 1906 */ 1907 #define EXT4_DEF_RESUID 0 1908 #define EXT4_DEF_RESGID 0 1909 1910 /* 1911 * Default project ID 1912 */ 1913 #define EXT4_DEF_PROJID 0 1914 1915 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1916 1917 /* 1918 * Default mount options 1919 */ 1920 #define EXT4_DEFM_DEBUG 0x0001 1921 #define EXT4_DEFM_BSDGROUPS 0x0002 1922 #define EXT4_DEFM_XATTR_USER 0x0004 1923 #define EXT4_DEFM_ACL 0x0008 1924 #define EXT4_DEFM_UID16 0x0010 1925 #define EXT4_DEFM_JMODE 0x0060 1926 #define EXT4_DEFM_JMODE_DATA 0x0020 1927 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1928 #define EXT4_DEFM_JMODE_WBACK 0x0060 1929 #define EXT4_DEFM_NOBARRIER 0x0100 1930 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1931 #define EXT4_DEFM_DISCARD 0x0400 1932 #define EXT4_DEFM_NODELALLOC 0x0800 1933 1934 /* 1935 * Default journal batch times 1936 */ 1937 #define EXT4_DEF_MIN_BATCH_TIME 0 1938 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1939 1940 /* 1941 * Minimum number of groups in a flexgroup before we separate out 1942 * directories into the first block group of a flexgroup 1943 */ 1944 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1945 1946 /* 1947 * Structure of a directory entry 1948 */ 1949 #define EXT4_NAME_LEN 255 1950 1951 struct ext4_dir_entry { 1952 __le32 inode; /* Inode number */ 1953 __le16 rec_len; /* Directory entry length */ 1954 __le16 name_len; /* Name length */ 1955 char name[EXT4_NAME_LEN]; /* File name */ 1956 }; 1957 1958 /* 1959 * The new version of the directory entry. Since EXT4 structures are 1960 * stored in intel byte order, and the name_len field could never be 1961 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1962 * file_type field. 1963 */ 1964 struct ext4_dir_entry_2 { 1965 __le32 inode; /* Inode number */ 1966 __le16 rec_len; /* Directory entry length */ 1967 __u8 name_len; /* Name length */ 1968 __u8 file_type; 1969 char name[EXT4_NAME_LEN]; /* File name */ 1970 }; 1971 1972 /* 1973 * This is a bogus directory entry at the end of each leaf block that 1974 * records checksums. 1975 */ 1976 struct ext4_dir_entry_tail { 1977 __le32 det_reserved_zero1; /* Pretend to be unused */ 1978 __le16 det_rec_len; /* 12 */ 1979 __u8 det_reserved_zero2; /* Zero name length */ 1980 __u8 det_reserved_ft; /* 0xDE, fake file type */ 1981 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1982 }; 1983 1984 #define EXT4_DIRENT_TAIL(block, blocksize) \ 1985 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 1986 ((blocksize) - \ 1987 sizeof(struct ext4_dir_entry_tail)))) 1988 1989 /* 1990 * Ext4 directory file types. Only the low 3 bits are used. The 1991 * other bits are reserved for now. 1992 */ 1993 #define EXT4_FT_UNKNOWN 0 1994 #define EXT4_FT_REG_FILE 1 1995 #define EXT4_FT_DIR 2 1996 #define EXT4_FT_CHRDEV 3 1997 #define EXT4_FT_BLKDEV 4 1998 #define EXT4_FT_FIFO 5 1999 #define EXT4_FT_SOCK 6 2000 #define EXT4_FT_SYMLINK 7 2001 2002 #define EXT4_FT_MAX 8 2003 2004 #define EXT4_FT_DIR_CSUM 0xDE 2005 2006 /* 2007 * EXT4_DIR_PAD defines the directory entries boundaries 2008 * 2009 * NOTE: It must be a multiple of 4 2010 */ 2011 #define EXT4_DIR_PAD 4 2012 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 2013 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 2014 ~EXT4_DIR_ROUND) 2015 #define EXT4_MAX_REC_LEN ((1<<16)-1) 2016 2017 /* 2018 * If we ever get support for fs block sizes > page_size, we'll need 2019 * to remove the #if statements in the next two functions... 2020 */ 2021 static inline unsigned int 2022 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 2023 { 2024 unsigned len = le16_to_cpu(dlen); 2025 2026 #if (PAGE_SIZE >= 65536) 2027 if (len == EXT4_MAX_REC_LEN || len == 0) 2028 return blocksize; 2029 return (len & 65532) | ((len & 3) << 16); 2030 #else 2031 return len; 2032 #endif 2033 } 2034 2035 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 2036 { 2037 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 2038 BUG(); 2039 #if (PAGE_SIZE >= 65536) 2040 if (len < 65536) 2041 return cpu_to_le16(len); 2042 if (len == blocksize) { 2043 if (blocksize == 65536) 2044 return cpu_to_le16(EXT4_MAX_REC_LEN); 2045 else 2046 return cpu_to_le16(0); 2047 } 2048 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 2049 #else 2050 return cpu_to_le16(len); 2051 #endif 2052 } 2053 2054 /* 2055 * Hash Tree Directory indexing 2056 * (c) Daniel Phillips, 2001 2057 */ 2058 2059 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2060 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2061 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \ 2062 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir))) 2063 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2064 2065 /* Legal values for the dx_root hash_version field: */ 2066 2067 #define DX_HASH_LEGACY 0 2068 #define DX_HASH_HALF_MD4 1 2069 #define DX_HASH_TEA 2 2070 #define DX_HASH_LEGACY_UNSIGNED 3 2071 #define DX_HASH_HALF_MD4_UNSIGNED 4 2072 #define DX_HASH_TEA_UNSIGNED 5 2073 2074 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 2075 const void *address, unsigned int length) 2076 { 2077 struct { 2078 struct shash_desc shash; 2079 char ctx[4]; 2080 } desc; 2081 2082 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2083 2084 desc.shash.tfm = sbi->s_chksum_driver; 2085 *(u32 *)desc.ctx = crc; 2086 2087 BUG_ON(crypto_shash_update(&desc.shash, address, length)); 2088 2089 return *(u32 *)desc.ctx; 2090 } 2091 2092 #ifdef __KERNEL__ 2093 2094 /* hash info structure used by the directory hash */ 2095 struct dx_hash_info 2096 { 2097 u32 hash; 2098 u32 minor_hash; 2099 int hash_version; 2100 u32 *seed; 2101 }; 2102 2103 2104 /* 32 and 64 bit signed EOF for dx directories */ 2105 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2106 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2107 2108 2109 /* 2110 * Control parameters used by ext4_htree_next_block 2111 */ 2112 #define HASH_NB_ALWAYS 1 2113 2114 struct ext4_filename { 2115 const struct qstr *usr_fname; 2116 struct fscrypt_str disk_name; 2117 struct dx_hash_info hinfo; 2118 #ifdef CONFIG_FS_ENCRYPTION 2119 struct fscrypt_str crypto_buf; 2120 #endif 2121 #ifdef CONFIG_UNICODE 2122 struct fscrypt_str cf_name; 2123 #endif 2124 }; 2125 2126 #define fname_name(p) ((p)->disk_name.name) 2127 #define fname_len(p) ((p)->disk_name.len) 2128 2129 /* 2130 * Describe an inode's exact location on disk and in memory 2131 */ 2132 struct ext4_iloc 2133 { 2134 struct buffer_head *bh; 2135 unsigned long offset; 2136 ext4_group_t block_group; 2137 }; 2138 2139 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2140 { 2141 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2142 } 2143 2144 static inline bool ext4_is_quota_file(struct inode *inode) 2145 { 2146 return IS_NOQUOTA(inode) && 2147 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL); 2148 } 2149 2150 /* 2151 * This structure is stuffed into the struct file's private_data field 2152 * for directories. It is where we put information so that we can do 2153 * readdir operations in hash tree order. 2154 */ 2155 struct dir_private_info { 2156 struct rb_root root; 2157 struct rb_node *curr_node; 2158 struct fname *extra_fname; 2159 loff_t last_pos; 2160 __u32 curr_hash; 2161 __u32 curr_minor_hash; 2162 __u32 next_hash; 2163 }; 2164 2165 /* calculate the first block number of the group */ 2166 static inline ext4_fsblk_t 2167 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2168 { 2169 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2170 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2171 } 2172 2173 /* 2174 * Special error return code only used by dx_probe() and its callers. 2175 */ 2176 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2177 2178 /* htree levels for ext4 */ 2179 #define EXT4_HTREE_LEVEL_COMPAT 2 2180 #define EXT4_HTREE_LEVEL 3 2181 2182 static inline int ext4_dir_htree_level(struct super_block *sb) 2183 { 2184 return ext4_has_feature_largedir(sb) ? 2185 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT; 2186 } 2187 2188 /* 2189 * Timeout and state flag for lazy initialization inode thread. 2190 */ 2191 #define EXT4_DEF_LI_WAIT_MULT 10 2192 #define EXT4_DEF_LI_MAX_START_DELAY 5 2193 #define EXT4_LAZYINIT_QUIT 0x0001 2194 #define EXT4_LAZYINIT_RUNNING 0x0002 2195 2196 /* 2197 * Lazy inode table initialization info 2198 */ 2199 struct ext4_lazy_init { 2200 unsigned long li_state; 2201 struct list_head li_request_list; 2202 struct mutex li_list_mtx; 2203 }; 2204 2205 struct ext4_li_request { 2206 struct super_block *lr_super; 2207 struct ext4_sb_info *lr_sbi; 2208 ext4_group_t lr_next_group; 2209 struct list_head lr_request; 2210 unsigned long lr_next_sched; 2211 unsigned long lr_timeout; 2212 }; 2213 2214 struct ext4_features { 2215 struct kobject f_kobj; 2216 struct completion f_kobj_unregister; 2217 }; 2218 2219 /* 2220 * This structure will be used for multiple mount protection. It will be 2221 * written into the block number saved in the s_mmp_block field in the 2222 * superblock. Programs that check MMP should assume that if 2223 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2224 * to use the filesystem, regardless of how old the timestamp is. 2225 */ 2226 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2227 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2228 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2229 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2230 2231 struct mmp_struct { 2232 __le32 mmp_magic; /* Magic number for MMP */ 2233 __le32 mmp_seq; /* Sequence no. updated periodically */ 2234 2235 /* 2236 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2237 * purposes and do not affect the correctness of the algorithm 2238 */ 2239 __le64 mmp_time; /* Time last updated */ 2240 char mmp_nodename[64]; /* Node which last updated MMP block */ 2241 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2242 2243 /* 2244 * mmp_check_interval is used to verify if the MMP block has been 2245 * updated on the block device. The value is updated based on the 2246 * maximum time to write the MMP block during an update cycle. 2247 */ 2248 __le16 mmp_check_interval; 2249 2250 __le16 mmp_pad1; 2251 __le32 mmp_pad2[226]; 2252 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2253 }; 2254 2255 /* arguments passed to the mmp thread */ 2256 struct mmpd_data { 2257 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2258 struct super_block *sb; /* super block of the fs */ 2259 }; 2260 2261 /* 2262 * Check interval multiplier 2263 * The MMP block is written every update interval and initially checked every 2264 * update interval x the multiplier (the value is then adapted based on the 2265 * write latency). The reason is that writes can be delayed under load and we 2266 * don't want readers to incorrectly assume that the filesystem is no longer 2267 * in use. 2268 */ 2269 #define EXT4_MMP_CHECK_MULT 2UL 2270 2271 /* 2272 * Minimum interval for MMP checking in seconds. 2273 */ 2274 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2275 2276 /* 2277 * Maximum interval for MMP checking in seconds. 2278 */ 2279 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2280 2281 /* 2282 * Function prototypes 2283 */ 2284 2285 /* 2286 * Ok, these declarations are also in <linux/kernel.h> but none of the 2287 * ext4 source programs needs to include it so they are duplicated here. 2288 */ 2289 # define NORET_TYPE /**/ 2290 # define ATTRIB_NORET __attribute__((noreturn)) 2291 # define NORET_AND noreturn, 2292 2293 /* bitmap.c */ 2294 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2295 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2296 struct ext4_group_desc *gdp, 2297 struct buffer_head *bh, int sz); 2298 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2299 struct ext4_group_desc *gdp, 2300 struct buffer_head *bh, int sz); 2301 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2302 struct ext4_group_desc *gdp, 2303 struct buffer_head *bh); 2304 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2305 struct ext4_group_desc *gdp, 2306 struct buffer_head *bh); 2307 2308 /* balloc.c */ 2309 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2310 ext4_fsblk_t blocknr, 2311 ext4_group_t *blockgrpp, 2312 ext4_grpblk_t *offsetp); 2313 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2314 ext4_fsblk_t block); 2315 2316 extern unsigned int ext4_block_group(struct super_block *sb, 2317 ext4_fsblk_t blocknr); 2318 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2319 ext4_fsblk_t blocknr); 2320 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2321 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2322 ext4_group_t group); 2323 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2324 ext4_fsblk_t goal, 2325 unsigned int flags, 2326 unsigned long *count, 2327 int *errp); 2328 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2329 s64 nclusters, unsigned int flags); 2330 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2331 extern void ext4_check_blocks_bitmap(struct super_block *); 2332 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2333 ext4_group_t block_group, 2334 struct buffer_head ** bh); 2335 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2336 2337 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2338 ext4_group_t block_group); 2339 extern int ext4_wait_block_bitmap(struct super_block *sb, 2340 ext4_group_t block_group, 2341 struct buffer_head *bh); 2342 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2343 ext4_group_t block_group); 2344 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2345 ext4_group_t block_group, 2346 struct ext4_group_desc *gdp); 2347 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2348 2349 #ifdef CONFIG_UNICODE 2350 extern void ext4_fname_setup_ci_filename(struct inode *dir, 2351 const struct qstr *iname, 2352 struct fscrypt_str *fname); 2353 #endif 2354 2355 #ifdef CONFIG_FS_ENCRYPTION 2356 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst, 2357 const struct fscrypt_name *src) 2358 { 2359 memset(dst, 0, sizeof(*dst)); 2360 2361 dst->usr_fname = src->usr_fname; 2362 dst->disk_name = src->disk_name; 2363 dst->hinfo.hash = src->hash; 2364 dst->hinfo.minor_hash = src->minor_hash; 2365 dst->crypto_buf = src->crypto_buf; 2366 } 2367 2368 static inline int ext4_fname_setup_filename(struct inode *dir, 2369 const struct qstr *iname, 2370 int lookup, 2371 struct ext4_filename *fname) 2372 { 2373 struct fscrypt_name name; 2374 int err; 2375 2376 err = fscrypt_setup_filename(dir, iname, lookup, &name); 2377 if (err) 2378 return err; 2379 2380 ext4_fname_from_fscrypt_name(fname, &name); 2381 2382 #ifdef CONFIG_UNICODE 2383 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name); 2384 #endif 2385 return 0; 2386 } 2387 2388 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2389 struct dentry *dentry, 2390 struct ext4_filename *fname) 2391 { 2392 struct fscrypt_name name; 2393 int err; 2394 2395 err = fscrypt_prepare_lookup(dir, dentry, &name); 2396 if (err) 2397 return err; 2398 2399 ext4_fname_from_fscrypt_name(fname, &name); 2400 2401 #ifdef CONFIG_UNICODE 2402 ext4_fname_setup_ci_filename(dir, &dentry->d_name, &fname->cf_name); 2403 #endif 2404 return 0; 2405 } 2406 2407 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2408 { 2409 struct fscrypt_name name; 2410 2411 name.crypto_buf = fname->crypto_buf; 2412 fscrypt_free_filename(&name); 2413 2414 fname->crypto_buf.name = NULL; 2415 fname->usr_fname = NULL; 2416 fname->disk_name.name = NULL; 2417 2418 #ifdef CONFIG_UNICODE 2419 kfree(fname->cf_name.name); 2420 fname->cf_name.name = NULL; 2421 #endif 2422 } 2423 #else /* !CONFIG_FS_ENCRYPTION */ 2424 static inline int ext4_fname_setup_filename(struct inode *dir, 2425 const struct qstr *iname, 2426 int lookup, 2427 struct ext4_filename *fname) 2428 { 2429 fname->usr_fname = iname; 2430 fname->disk_name.name = (unsigned char *) iname->name; 2431 fname->disk_name.len = iname->len; 2432 2433 #ifdef CONFIG_UNICODE 2434 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name); 2435 #endif 2436 2437 return 0; 2438 } 2439 2440 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2441 struct dentry *dentry, 2442 struct ext4_filename *fname) 2443 { 2444 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname); 2445 } 2446 2447 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2448 { 2449 #ifdef CONFIG_UNICODE 2450 kfree(fname->cf_name.name); 2451 fname->cf_name.name = NULL; 2452 #endif 2453 } 2454 #endif /* !CONFIG_FS_ENCRYPTION */ 2455 2456 /* dir.c */ 2457 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2458 struct file *, 2459 struct ext4_dir_entry_2 *, 2460 struct buffer_head *, char *, int, 2461 unsigned int); 2462 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2463 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2464 (de), (bh), (buf), (size), (offset))) 2465 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2466 __u32 minor_hash, 2467 struct ext4_dir_entry_2 *dirent, 2468 struct fscrypt_str *ent_name); 2469 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2470 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2471 struct buffer_head *bh, 2472 void *buf, int buf_size, 2473 struct ext4_filename *fname, 2474 struct ext4_dir_entry_2 **dest_de); 2475 void ext4_insert_dentry(struct inode *inode, 2476 struct ext4_dir_entry_2 *de, 2477 int buf_size, 2478 struct ext4_filename *fname); 2479 static inline void ext4_update_dx_flag(struct inode *inode) 2480 { 2481 if (!ext4_has_feature_dir_index(inode->i_sb)) 2482 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2483 } 2484 static const unsigned char ext4_filetype_table[] = { 2485 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2486 }; 2487 2488 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2489 { 2490 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2491 return DT_UNKNOWN; 2492 2493 return ext4_filetype_table[filetype]; 2494 } 2495 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2496 void *buf, int buf_size); 2497 2498 /* fsync.c */ 2499 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2500 2501 /* hash.c */ 2502 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len, 2503 struct dx_hash_info *hinfo); 2504 2505 /* ialloc.c */ 2506 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2507 const struct qstr *qstr, __u32 goal, 2508 uid_t *owner, __u32 i_flags, 2509 int handle_type, unsigned int line_no, 2510 int nblocks); 2511 2512 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \ 2513 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2514 i_flags, 0, 0, 0) 2515 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2516 type, nblocks) \ 2517 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2518 0, (type), __LINE__, (nblocks)) 2519 2520 2521 extern void ext4_free_inode(handle_t *, struct inode *); 2522 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2523 extern unsigned long ext4_count_free_inodes(struct super_block *); 2524 extern unsigned long ext4_count_dirs(struct super_block *); 2525 extern void ext4_check_inodes_bitmap(struct super_block *); 2526 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2527 extern int ext4_init_inode_table(struct super_block *sb, 2528 ext4_group_t group, int barrier); 2529 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2530 2531 /* mballoc.c */ 2532 extern const struct seq_operations ext4_mb_seq_groups_ops; 2533 extern long ext4_mb_stats; 2534 extern long ext4_mb_max_to_scan; 2535 extern int ext4_mb_init(struct super_block *); 2536 extern int ext4_mb_release(struct super_block *); 2537 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2538 struct ext4_allocation_request *, int *); 2539 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2540 extern void ext4_discard_preallocations(struct inode *); 2541 extern int __init ext4_init_mballoc(void); 2542 extern void ext4_exit_mballoc(void); 2543 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2544 struct buffer_head *bh, ext4_fsblk_t block, 2545 unsigned long count, int flags); 2546 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2547 ext4_group_t ngroups); 2548 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2549 ext4_group_t i, struct ext4_group_desc *desc); 2550 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2551 ext4_fsblk_t block, unsigned long count); 2552 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2553 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid); 2554 2555 /* inode.c */ 2556 int ext4_inode_is_fast_symlink(struct inode *inode); 2557 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2558 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2559 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count, 2560 bool wait, struct buffer_head **bhs); 2561 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2562 struct buffer_head *bh_result, int create); 2563 int ext4_get_block(struct inode *inode, sector_t iblock, 2564 struct buffer_head *bh_result, int create); 2565 int ext4_dio_get_block(struct inode *inode, sector_t iblock, 2566 struct buffer_head *bh_result, int create); 2567 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2568 struct buffer_head *bh, int create); 2569 int ext4_walk_page_buffers(handle_t *handle, 2570 struct buffer_head *head, 2571 unsigned from, 2572 unsigned to, 2573 int *partial, 2574 int (*fn)(handle_t *handle, 2575 struct buffer_head *bh)); 2576 int do_journal_get_write_access(handle_t *handle, 2577 struct buffer_head *bh); 2578 #define FALL_BACK_TO_NONDELALLOC 1 2579 #define CONVERT_INLINE_DATA 2 2580 2581 typedef enum { 2582 EXT4_IGET_NORMAL = 0, 2583 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */ 2584 EXT4_IGET_HANDLE = 0x0002 /* Inode # is from a handle */ 2585 } ext4_iget_flags; 2586 2587 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, 2588 ext4_iget_flags flags, const char *function, 2589 unsigned int line); 2590 2591 #define ext4_iget(sb, ino, flags) \ 2592 __ext4_iget((sb), (ino), (flags), __func__, __LINE__) 2593 2594 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2595 extern int ext4_setattr(struct dentry *, struct iattr *); 2596 extern int ext4_getattr(const struct path *, struct kstat *, u32, unsigned int); 2597 extern void ext4_evict_inode(struct inode *); 2598 extern void ext4_clear_inode(struct inode *); 2599 extern int ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int); 2600 extern int ext4_sync_inode(handle_t *, struct inode *); 2601 extern void ext4_dirty_inode(struct inode *, int); 2602 extern int ext4_change_inode_journal_flag(struct inode *, int); 2603 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2604 extern int ext4_inode_attach_jinode(struct inode *inode); 2605 extern int ext4_can_truncate(struct inode *inode); 2606 extern int ext4_truncate(struct inode *); 2607 extern int ext4_break_layouts(struct inode *); 2608 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2609 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 2610 extern void ext4_set_inode_flags(struct inode *); 2611 extern int ext4_alloc_da_blocks(struct inode *inode); 2612 extern void ext4_set_aops(struct inode *inode); 2613 extern int ext4_writepage_trans_blocks(struct inode *); 2614 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2615 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2616 loff_t lstart, loff_t lend); 2617 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf); 2618 extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf); 2619 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2620 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 2621 extern void ext4_da_release_space(struct inode *inode, int to_free); 2622 extern void ext4_da_update_reserve_space(struct inode *inode, 2623 int used, int quota_claim); 2624 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 2625 ext4_fsblk_t pblk, ext4_lblk_t len); 2626 2627 /* indirect.c */ 2628 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2629 struct ext4_map_blocks *map, int flags); 2630 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2631 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2632 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2633 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2634 ext4_lblk_t start, ext4_lblk_t end); 2635 2636 /* ioctl.c */ 2637 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2638 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2639 2640 /* migrate.c */ 2641 extern int ext4_ext_migrate(struct inode *); 2642 extern int ext4_ind_migrate(struct inode *inode); 2643 2644 /* namei.c */ 2645 extern int ext4_dirblock_csum_verify(struct inode *inode, 2646 struct buffer_head *bh); 2647 extern int ext4_orphan_add(handle_t *, struct inode *); 2648 extern int ext4_orphan_del(handle_t *, struct inode *); 2649 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2650 __u32 start_minor_hash, __u32 *next_hash); 2651 extern int ext4_search_dir(struct buffer_head *bh, 2652 char *search_buf, 2653 int buf_size, 2654 struct inode *dir, 2655 struct ext4_filename *fname, 2656 unsigned int offset, 2657 struct ext4_dir_entry_2 **res_dir); 2658 extern int ext4_generic_delete_entry(handle_t *handle, 2659 struct inode *dir, 2660 struct ext4_dir_entry_2 *de_del, 2661 struct buffer_head *bh, 2662 void *entry_buf, 2663 int buf_size, 2664 int csum_size); 2665 extern bool ext4_empty_dir(struct inode *inode); 2666 2667 /* resize.c */ 2668 extern int ext4_group_add(struct super_block *sb, 2669 struct ext4_new_group_data *input); 2670 extern int ext4_group_extend(struct super_block *sb, 2671 struct ext4_super_block *es, 2672 ext4_fsblk_t n_blocks_count); 2673 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2674 2675 /* super.c */ 2676 extern struct buffer_head *ext4_sb_bread(struct super_block *sb, 2677 sector_t block, int op_flags); 2678 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 2679 extern int ext4_calculate_overhead(struct super_block *sb); 2680 extern void ext4_superblock_csum_set(struct super_block *sb); 2681 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 2682 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 2683 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2684 ext4_group_t ngroup); 2685 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2686 char nbuf[16]); 2687 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb, 2688 ext4_group_t block_group, 2689 unsigned int flags); 2690 2691 extern __printf(4, 5) 2692 void __ext4_error(struct super_block *, const char *, unsigned int, 2693 const char *, ...); 2694 extern __printf(5, 6) 2695 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2696 const char *, ...); 2697 extern __printf(5, 6) 2698 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2699 const char *, ...); 2700 extern void __ext4_std_error(struct super_block *, const char *, 2701 unsigned int, int); 2702 extern __printf(4, 5) 2703 void __ext4_abort(struct super_block *, const char *, unsigned int, 2704 const char *, ...); 2705 extern __printf(4, 5) 2706 void __ext4_warning(struct super_block *, const char *, unsigned int, 2707 const char *, ...); 2708 extern __printf(4, 5) 2709 void __ext4_warning_inode(const struct inode *inode, const char *function, 2710 unsigned int line, const char *fmt, ...); 2711 extern __printf(3, 4) 2712 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2713 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2714 const char *, unsigned int, const char *); 2715 extern __printf(7, 8) 2716 void __ext4_grp_locked_error(const char *, unsigned int, 2717 struct super_block *, ext4_group_t, 2718 unsigned long, ext4_fsblk_t, 2719 const char *, ...); 2720 2721 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 2722 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 2723 2724 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 2725 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 2726 2727 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 2728 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 2729 2730 #ifdef CONFIG_PRINTK 2731 2732 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2733 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__) 2734 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2735 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2736 #define ext4_error(sb, fmt, ...) \ 2737 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2738 #define ext4_abort(sb, fmt, ...) \ 2739 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2740 #define ext4_warning(sb, fmt, ...) \ 2741 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2742 #define ext4_warning_inode(inode, fmt, ...) \ 2743 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 2744 #define ext4_msg(sb, level, fmt, ...) \ 2745 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 2746 #define dump_mmp_msg(sb, mmp, msg) \ 2747 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 2748 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2749 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 2750 fmt, ##__VA_ARGS__) 2751 2752 #else 2753 2754 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2755 do { \ 2756 no_printk(fmt, ##__VA_ARGS__); \ 2757 __ext4_error_inode(inode, "", 0, block, " "); \ 2758 } while (0) 2759 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2760 do { \ 2761 no_printk(fmt, ##__VA_ARGS__); \ 2762 __ext4_error_file(file, "", 0, block, " "); \ 2763 } while (0) 2764 #define ext4_error(sb, fmt, ...) \ 2765 do { \ 2766 no_printk(fmt, ##__VA_ARGS__); \ 2767 __ext4_error(sb, "", 0, " "); \ 2768 } while (0) 2769 #define ext4_abort(sb, fmt, ...) \ 2770 do { \ 2771 no_printk(fmt, ##__VA_ARGS__); \ 2772 __ext4_abort(sb, "", 0, " "); \ 2773 } while (0) 2774 #define ext4_warning(sb, fmt, ...) \ 2775 do { \ 2776 no_printk(fmt, ##__VA_ARGS__); \ 2777 __ext4_warning(sb, "", 0, " "); \ 2778 } while (0) 2779 #define ext4_warning_inode(inode, fmt, ...) \ 2780 do { \ 2781 no_printk(fmt, ##__VA_ARGS__); \ 2782 __ext4_warning_inode(inode, "", 0, " "); \ 2783 } while (0) 2784 #define ext4_msg(sb, level, fmt, ...) \ 2785 do { \ 2786 no_printk(fmt, ##__VA_ARGS__); \ 2787 __ext4_msg(sb, "", " "); \ 2788 } while (0) 2789 #define dump_mmp_msg(sb, mmp, msg) \ 2790 __dump_mmp_msg(sb, mmp, "", 0, "") 2791 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2792 do { \ 2793 no_printk(fmt, ##__VA_ARGS__); \ 2794 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 2795 } while (0) 2796 2797 #endif 2798 2799 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2800 __u32 compat); 2801 extern int ext4_update_rocompat_feature(handle_t *handle, 2802 struct super_block *sb, __u32 rocompat); 2803 extern int ext4_update_incompat_feature(handle_t *handle, 2804 struct super_block *sb, __u32 incompat); 2805 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2806 struct ext4_group_desc *bg); 2807 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2808 struct ext4_group_desc *bg); 2809 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2810 struct ext4_group_desc *bg); 2811 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2812 struct ext4_group_desc *bg); 2813 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2814 struct ext4_group_desc *bg); 2815 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2816 struct ext4_group_desc *bg); 2817 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2818 struct ext4_group_desc *bg); 2819 extern void ext4_block_bitmap_set(struct super_block *sb, 2820 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2821 extern void ext4_inode_bitmap_set(struct super_block *sb, 2822 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2823 extern void ext4_inode_table_set(struct super_block *sb, 2824 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2825 extern void ext4_free_group_clusters_set(struct super_block *sb, 2826 struct ext4_group_desc *bg, 2827 __u32 count); 2828 extern void ext4_free_inodes_set(struct super_block *sb, 2829 struct ext4_group_desc *bg, __u32 count); 2830 extern void ext4_used_dirs_set(struct super_block *sb, 2831 struct ext4_group_desc *bg, __u32 count); 2832 extern void ext4_itable_unused_set(struct super_block *sb, 2833 struct ext4_group_desc *bg, __u32 count); 2834 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2835 struct ext4_group_desc *gdp); 2836 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2837 struct ext4_group_desc *gdp); 2838 extern int ext4_register_li_request(struct super_block *sb, 2839 ext4_group_t first_not_zeroed); 2840 2841 static inline int ext4_has_metadata_csum(struct super_block *sb) 2842 { 2843 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 2844 !EXT4_SB(sb)->s_chksum_driver); 2845 2846 return ext4_has_feature_metadata_csum(sb) && 2847 (EXT4_SB(sb)->s_chksum_driver != NULL); 2848 } 2849 2850 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2851 { 2852 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb); 2853 } 2854 2855 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2856 { 2857 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2858 le32_to_cpu(es->s_blocks_count_lo); 2859 } 2860 2861 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2862 { 2863 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2864 le32_to_cpu(es->s_r_blocks_count_lo); 2865 } 2866 2867 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2868 { 2869 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2870 le32_to_cpu(es->s_free_blocks_count_lo); 2871 } 2872 2873 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2874 ext4_fsblk_t blk) 2875 { 2876 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2877 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2878 } 2879 2880 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2881 ext4_fsblk_t blk) 2882 { 2883 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2884 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2885 } 2886 2887 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2888 ext4_fsblk_t blk) 2889 { 2890 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2891 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2892 } 2893 2894 static inline loff_t ext4_isize(struct super_block *sb, 2895 struct ext4_inode *raw_inode) 2896 { 2897 if (ext4_has_feature_largedir(sb) || 2898 S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2899 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2900 le32_to_cpu(raw_inode->i_size_lo); 2901 2902 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2903 } 2904 2905 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2906 { 2907 raw_inode->i_size_lo = cpu_to_le32(i_size); 2908 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2909 } 2910 2911 static inline 2912 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2913 ext4_group_t group) 2914 { 2915 struct ext4_group_info ***grp_info; 2916 long indexv, indexh; 2917 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 2918 grp_info = EXT4_SB(sb)->s_group_info; 2919 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2920 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2921 return grp_info[indexv][indexh]; 2922 } 2923 2924 /* 2925 * Reading s_groups_count requires using smp_rmb() afterwards. See 2926 * the locking protocol documented in the comments of ext4_group_add() 2927 * in resize.c 2928 */ 2929 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2930 { 2931 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2932 2933 smp_rmb(); 2934 return ngroups; 2935 } 2936 2937 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2938 ext4_group_t block_group) 2939 { 2940 return block_group >> sbi->s_log_groups_per_flex; 2941 } 2942 2943 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2944 { 2945 return 1 << sbi->s_log_groups_per_flex; 2946 } 2947 2948 #define ext4_std_error(sb, errno) \ 2949 do { \ 2950 if ((errno)) \ 2951 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2952 } while (0) 2953 2954 #ifdef CONFIG_SMP 2955 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2956 * counters. So we need to make sure we have free clusters more 2957 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2958 */ 2959 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2960 #else 2961 #define EXT4_FREECLUSTERS_WATERMARK 0 2962 #endif 2963 2964 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 2965 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2966 { 2967 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 2968 !inode_is_locked(inode)); 2969 down_write(&EXT4_I(inode)->i_data_sem); 2970 if (newsize > EXT4_I(inode)->i_disksize) 2971 EXT4_I(inode)->i_disksize = newsize; 2972 up_write(&EXT4_I(inode)->i_data_sem); 2973 } 2974 2975 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 2976 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 2977 { 2978 int changed = 0; 2979 2980 if (newsize > inode->i_size) { 2981 i_size_write(inode, newsize); 2982 changed = 1; 2983 } 2984 if (newsize > EXT4_I(inode)->i_disksize) { 2985 ext4_update_i_disksize(inode, newsize); 2986 changed |= 2; 2987 } 2988 return changed; 2989 } 2990 2991 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 2992 loff_t len); 2993 2994 struct ext4_group_info { 2995 unsigned long bb_state; 2996 struct rb_root bb_free_root; 2997 ext4_grpblk_t bb_first_free; /* first free block */ 2998 ext4_grpblk_t bb_free; /* total free blocks */ 2999 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 3000 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 3001 struct list_head bb_prealloc_list; 3002 #ifdef DOUBLE_CHECK 3003 void *bb_bitmap; 3004 #endif 3005 struct rw_semaphore alloc_sem; 3006 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 3007 * regions, index is order. 3008 * bb_counters[3] = 5 means 3009 * 5 free 8-block regions. */ 3010 }; 3011 3012 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 3013 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 3014 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 3015 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 3016 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \ 3017 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT) 3018 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \ 3019 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT) 3020 3021 #define EXT4_MB_GRP_NEED_INIT(grp) \ 3022 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 3023 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 3024 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3025 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 3026 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3027 3028 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 3029 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3030 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 3031 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3032 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 3033 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3034 3035 #define EXT4_MAX_CONTENTION 8 3036 #define EXT4_CONTENTION_THRESHOLD 2 3037 3038 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 3039 ext4_group_t group) 3040 { 3041 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 3042 } 3043 3044 /* 3045 * Returns true if the filesystem is busy enough that attempts to 3046 * access the block group locks has run into contention. 3047 */ 3048 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 3049 { 3050 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 3051 } 3052 3053 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 3054 { 3055 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 3056 if (spin_trylock(lock)) 3057 /* 3058 * We're able to grab the lock right away, so drop the 3059 * lock contention counter. 3060 */ 3061 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 3062 else { 3063 /* 3064 * The lock is busy, so bump the contention counter, 3065 * and then wait on the spin lock. 3066 */ 3067 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 3068 EXT4_MAX_CONTENTION); 3069 spin_lock(lock); 3070 } 3071 } 3072 3073 static inline void ext4_unlock_group(struct super_block *sb, 3074 ext4_group_t group) 3075 { 3076 spin_unlock(ext4_group_lock_ptr(sb, group)); 3077 } 3078 3079 /* 3080 * Block validity checking 3081 */ 3082 #define ext4_check_indirect_blockref(inode, bh) \ 3083 ext4_check_blockref(__func__, __LINE__, inode, \ 3084 (__le32 *)(bh)->b_data, \ 3085 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 3086 3087 #define ext4_ind_check_inode(inode) \ 3088 ext4_check_blockref(__func__, __LINE__, inode, \ 3089 EXT4_I(inode)->i_data, \ 3090 EXT4_NDIR_BLOCKS) 3091 3092 /* 3093 * Inodes and files operations 3094 */ 3095 3096 /* dir.c */ 3097 extern const struct file_operations ext4_dir_operations; 3098 3099 #ifdef CONFIG_UNICODE 3100 extern const struct dentry_operations ext4_dentry_ops; 3101 #endif 3102 3103 /* file.c */ 3104 extern const struct inode_operations ext4_file_inode_operations; 3105 extern const struct file_operations ext4_file_operations; 3106 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 3107 3108 /* inline.c */ 3109 extern int ext4_get_max_inline_size(struct inode *inode); 3110 extern int ext4_find_inline_data_nolock(struct inode *inode); 3111 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 3112 unsigned int len); 3113 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 3114 3115 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 3116 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 3117 struct inode *inode, 3118 loff_t pos, unsigned len, 3119 unsigned flags, 3120 struct page **pagep); 3121 extern int ext4_write_inline_data_end(struct inode *inode, 3122 loff_t pos, unsigned len, 3123 unsigned copied, 3124 struct page *page); 3125 extern struct buffer_head * 3126 ext4_journalled_write_inline_data(struct inode *inode, 3127 unsigned len, 3128 struct page *page); 3129 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 3130 struct inode *inode, 3131 loff_t pos, unsigned len, 3132 unsigned flags, 3133 struct page **pagep, 3134 void **fsdata); 3135 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 3136 unsigned len, unsigned copied, 3137 struct page *page); 3138 extern int ext4_try_add_inline_entry(handle_t *handle, 3139 struct ext4_filename *fname, 3140 struct inode *dir, struct inode *inode); 3141 extern int ext4_try_create_inline_dir(handle_t *handle, 3142 struct inode *parent, 3143 struct inode *inode); 3144 extern int ext4_read_inline_dir(struct file *filp, 3145 struct dir_context *ctx, 3146 int *has_inline_data); 3147 extern int ext4_inlinedir_to_tree(struct file *dir_file, 3148 struct inode *dir, ext4_lblk_t block, 3149 struct dx_hash_info *hinfo, 3150 __u32 start_hash, __u32 start_minor_hash, 3151 int *has_inline_data); 3152 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3153 struct ext4_filename *fname, 3154 struct ext4_dir_entry_2 **res_dir, 3155 int *has_inline_data); 3156 extern int ext4_delete_inline_entry(handle_t *handle, 3157 struct inode *dir, 3158 struct ext4_dir_entry_2 *de_del, 3159 struct buffer_head *bh, 3160 int *has_inline_data); 3161 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); 3162 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3163 struct ext4_dir_entry_2 **parent_de, 3164 int *retval); 3165 extern int ext4_inline_data_fiemap(struct inode *inode, 3166 struct fiemap_extent_info *fieinfo, 3167 int *has_inline, __u64 start, __u64 len); 3168 3169 struct iomap; 3170 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap); 3171 3172 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3173 3174 extern int ext4_convert_inline_data(struct inode *inode); 3175 3176 static inline int ext4_has_inline_data(struct inode *inode) 3177 { 3178 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3179 EXT4_I(inode)->i_inline_off; 3180 } 3181 3182 /* namei.c */ 3183 extern const struct inode_operations ext4_dir_inode_operations; 3184 extern const struct inode_operations ext4_special_inode_operations; 3185 extern struct dentry *ext4_get_parent(struct dentry *child); 3186 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3187 struct ext4_dir_entry_2 *de, 3188 int blocksize, int csum_size, 3189 unsigned int parent_ino, int dotdot_real_len); 3190 extern void ext4_initialize_dirent_tail(struct buffer_head *bh, 3191 unsigned int blocksize); 3192 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode, 3193 struct buffer_head *bh); 3194 extern int ext4_ci_compare(const struct inode *parent, 3195 const struct qstr *fname, 3196 const struct qstr *entry, bool quick); 3197 3198 #define S_SHIFT 12 3199 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = { 3200 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3201 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3202 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3203 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3204 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3205 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3206 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3207 }; 3208 3209 static inline void ext4_set_de_type(struct super_block *sb, 3210 struct ext4_dir_entry_2 *de, 3211 umode_t mode) { 3212 if (ext4_has_feature_filetype(sb)) 3213 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3214 } 3215 3216 /* readpages.c */ 3217 extern int ext4_mpage_readpages(struct address_space *mapping, 3218 struct list_head *pages, struct page *page, 3219 unsigned nr_pages, bool is_readahead); 3220 extern int __init ext4_init_post_read_processing(void); 3221 extern void ext4_exit_post_read_processing(void); 3222 3223 /* symlink.c */ 3224 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3225 extern const struct inode_operations ext4_symlink_inode_operations; 3226 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3227 3228 /* sysfs.c */ 3229 extern int ext4_register_sysfs(struct super_block *sb); 3230 extern void ext4_unregister_sysfs(struct super_block *sb); 3231 extern int __init ext4_init_sysfs(void); 3232 extern void ext4_exit_sysfs(void); 3233 3234 /* block_validity */ 3235 extern void ext4_release_system_zone(struct super_block *sb); 3236 extern int ext4_setup_system_zone(struct super_block *sb); 3237 extern int __init ext4_init_system_zone(void); 3238 extern void ext4_exit_system_zone(void); 3239 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 3240 ext4_fsblk_t start_blk, 3241 unsigned int count); 3242 extern int ext4_check_blockref(const char *, unsigned int, 3243 struct inode *, __le32 *, unsigned int); 3244 3245 /* extents.c */ 3246 struct ext4_ext_path; 3247 struct ext4_extent; 3248 3249 /* 3250 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3251 * __le32. 3252 */ 3253 #define EXT_MAX_BLOCKS 0xffffffff 3254 3255 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 3256 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 3257 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3258 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3259 struct ext4_map_blocks *map, int flags); 3260 extern int ext4_ext_truncate(handle_t *, struct inode *); 3261 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3262 ext4_lblk_t end); 3263 extern void ext4_ext_init(struct super_block *); 3264 extern void ext4_ext_release(struct super_block *); 3265 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3266 loff_t len); 3267 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3268 loff_t offset, ssize_t len); 3269 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3270 struct ext4_map_blocks *map, int flags); 3271 extern int ext4_ext_calc_metadata_amount(struct inode *inode, 3272 ext4_lblk_t lblocks); 3273 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3274 int num, 3275 struct ext4_ext_path *path); 3276 extern int ext4_can_extents_be_merged(struct inode *inode, 3277 struct ext4_extent *ex1, 3278 struct ext4_extent *ex2); 3279 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3280 struct ext4_ext_path **, 3281 struct ext4_extent *, int); 3282 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3283 struct ext4_ext_path **, 3284 int flags); 3285 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 3286 extern int ext4_ext_check_inode(struct inode *inode); 3287 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3288 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3289 __u64 start, __u64 len); 3290 extern int ext4_get_es_cache(struct inode *inode, 3291 struct fiemap_extent_info *fieinfo, 3292 __u64 start, __u64 len); 3293 extern int ext4_ext_precache(struct inode *inode); 3294 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len); 3295 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len); 3296 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3297 struct inode *inode2, ext4_lblk_t lblk1, 3298 ext4_lblk_t lblk2, ext4_lblk_t count, 3299 int mark_unwritten,int *err); 3300 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu); 3301 3302 /* move_extent.c */ 3303 extern void ext4_double_down_write_data_sem(struct inode *first, 3304 struct inode *second); 3305 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3306 struct inode *donor_inode); 3307 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3308 __u64 start_orig, __u64 start_donor, 3309 __u64 len, __u64 *moved_len); 3310 3311 /* page-io.c */ 3312 extern int __init ext4_init_pageio(void); 3313 extern void ext4_exit_pageio(void); 3314 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3315 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3316 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3317 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3318 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3319 struct writeback_control *wbc); 3320 extern void ext4_end_io_rsv_work(struct work_struct *work); 3321 extern void ext4_io_submit(struct ext4_io_submit *io); 3322 extern int ext4_bio_write_page(struct ext4_io_submit *io, 3323 struct page *page, 3324 int len, 3325 struct writeback_control *wbc, 3326 bool keep_towrite); 3327 3328 /* mmp.c */ 3329 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3330 3331 /* verity.c */ 3332 extern const struct fsverity_operations ext4_verityops; 3333 3334 /* 3335 * Add new method to test whether block and inode bitmaps are properly 3336 * initialized. With uninit_bg reading the block from disk is not enough 3337 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3338 */ 3339 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3340 3341 static inline int bitmap_uptodate(struct buffer_head *bh) 3342 { 3343 return (buffer_uptodate(bh) && 3344 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3345 } 3346 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3347 { 3348 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3349 } 3350 3351 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3352 3353 /* For ioend & aio unwritten conversion wait queues */ 3354 #define EXT4_WQ_HASH_SZ 37 3355 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3356 EXT4_WQ_HASH_SZ]) 3357 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3358 3359 extern int ext4_resize_begin(struct super_block *sb); 3360 extern void ext4_resize_end(struct super_block *sb); 3361 3362 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 3363 struct ext4_io_end *io_end) 3364 { 3365 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 3366 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3367 atomic_inc(&EXT4_I(inode)->i_unwritten); 3368 } 3369 } 3370 3371 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3372 { 3373 struct inode *inode = io_end->inode; 3374 3375 if (io_end->flag & EXT4_IO_END_UNWRITTEN) { 3376 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3377 /* Wake up anyone waiting on unwritten extent conversion */ 3378 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) 3379 wake_up_all(ext4_ioend_wq(inode)); 3380 } 3381 } 3382 3383 extern const struct iomap_ops ext4_iomap_ops; 3384 3385 static inline int ext4_buffer_uptodate(struct buffer_head *bh) 3386 { 3387 /* 3388 * If the buffer has the write error flag, we have failed 3389 * to write out data in the block. In this case, we don't 3390 * have to read the block because we may read the old data 3391 * successfully. 3392 */ 3393 if (!buffer_uptodate(bh) && buffer_write_io_error(bh)) 3394 set_buffer_uptodate(bh); 3395 return buffer_uptodate(bh); 3396 } 3397 3398 #endif /* __KERNEL__ */ 3399 3400 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3401 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3402 3403 #endif /* _EXT4_H */ 3404