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 1682 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1683 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1684 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1685 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1686 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1687 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1688 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1689 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1690 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1691 /* 1692 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1693 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1694 * all other data structures' checksums. However, the METADATA_CSUM and 1695 * GDT_CSUM bits are mutually exclusive. 1696 */ 1697 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1698 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1699 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 1700 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000 1701 1702 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1703 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1704 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1705 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1706 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1707 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1708 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1709 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1710 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1711 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1712 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1713 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 1714 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1715 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1716 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1717 #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000 1718 1719 extern void ext4_update_dynamic_rev(struct super_block *sb); 1720 1721 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 1722 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1723 { \ 1724 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1725 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 1726 } \ 1727 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1728 { \ 1729 ext4_update_dynamic_rev(sb); \ 1730 EXT4_SB(sb)->s_es->s_feature_compat |= \ 1731 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1732 } \ 1733 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1734 { \ 1735 EXT4_SB(sb)->s_es->s_feature_compat &= \ 1736 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1737 } 1738 1739 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 1740 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1741 { \ 1742 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1743 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 1744 } \ 1745 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1746 { \ 1747 ext4_update_dynamic_rev(sb); \ 1748 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 1749 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1750 } \ 1751 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1752 { \ 1753 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 1754 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1755 } 1756 1757 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 1758 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1759 { \ 1760 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1761 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 1762 } \ 1763 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1764 { \ 1765 ext4_update_dynamic_rev(sb); \ 1766 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 1767 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1768 } \ 1769 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1770 { \ 1771 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 1772 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1773 } 1774 1775 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 1776 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 1777 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 1778 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 1779 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 1780 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 1781 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 1782 1783 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 1784 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 1785 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 1786 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 1787 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 1788 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 1789 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 1790 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 1791 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 1792 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 1793 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 1794 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 1795 EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY) 1796 1797 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 1798 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 1799 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 1800 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 1801 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 1802 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 1803 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 1804 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 1805 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 1806 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 1807 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 1808 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 1809 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 1810 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 1811 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 1812 EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD) 1813 1814 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1815 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1816 EXT4_FEATURE_INCOMPAT_META_BG) 1817 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1818 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1819 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1820 1821 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1822 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1823 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1824 EXT4_FEATURE_INCOMPAT_META_BG) 1825 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1826 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1827 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1828 1829 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1830 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1831 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1832 EXT4_FEATURE_INCOMPAT_META_BG| \ 1833 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1834 EXT4_FEATURE_INCOMPAT_64BIT| \ 1835 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1836 EXT4_FEATURE_INCOMPAT_EA_INODE| \ 1837 EXT4_FEATURE_INCOMPAT_MMP | \ 1838 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 1839 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 1840 EXT4_FEATURE_INCOMPAT_CASEFOLD | \ 1841 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \ 1842 EXT4_FEATURE_INCOMPAT_LARGEDIR) 1843 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1844 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1845 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1846 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1847 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1848 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1849 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1850 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1851 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1852 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 1853 EXT4_FEATURE_RO_COMPAT_PROJECT |\ 1854 EXT4_FEATURE_RO_COMPAT_VERITY) 1855 1856 #define EXTN_FEATURE_FUNCS(ver) \ 1857 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 1858 { \ 1859 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1860 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 1861 } \ 1862 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 1863 { \ 1864 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1865 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 1866 } \ 1867 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 1868 { \ 1869 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1870 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 1871 } 1872 1873 EXTN_FEATURE_FUNCS(2) 1874 EXTN_FEATURE_FUNCS(3) 1875 EXTN_FEATURE_FUNCS(4) 1876 1877 static inline bool ext4_has_compat_features(struct super_block *sb) 1878 { 1879 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 1880 } 1881 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 1882 { 1883 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 1884 } 1885 static inline bool ext4_has_incompat_features(struct super_block *sb) 1886 { 1887 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 1888 } 1889 1890 /* 1891 * Superblock flags 1892 */ 1893 #define EXT4_FLAGS_RESIZING 0 1894 #define EXT4_FLAGS_SHUTDOWN 1 1895 1896 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi) 1897 { 1898 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 1899 } 1900 1901 1902 /* 1903 * Default values for user and/or group using reserved blocks 1904 */ 1905 #define EXT4_DEF_RESUID 0 1906 #define EXT4_DEF_RESGID 0 1907 1908 /* 1909 * Default project ID 1910 */ 1911 #define EXT4_DEF_PROJID 0 1912 1913 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1914 1915 /* 1916 * Default mount options 1917 */ 1918 #define EXT4_DEFM_DEBUG 0x0001 1919 #define EXT4_DEFM_BSDGROUPS 0x0002 1920 #define EXT4_DEFM_XATTR_USER 0x0004 1921 #define EXT4_DEFM_ACL 0x0008 1922 #define EXT4_DEFM_UID16 0x0010 1923 #define EXT4_DEFM_JMODE 0x0060 1924 #define EXT4_DEFM_JMODE_DATA 0x0020 1925 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1926 #define EXT4_DEFM_JMODE_WBACK 0x0060 1927 #define EXT4_DEFM_NOBARRIER 0x0100 1928 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1929 #define EXT4_DEFM_DISCARD 0x0400 1930 #define EXT4_DEFM_NODELALLOC 0x0800 1931 1932 /* 1933 * Default journal batch times 1934 */ 1935 #define EXT4_DEF_MIN_BATCH_TIME 0 1936 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1937 1938 /* 1939 * Minimum number of groups in a flexgroup before we separate out 1940 * directories into the first block group of a flexgroup 1941 */ 1942 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1943 1944 /* 1945 * Structure of a directory entry 1946 */ 1947 #define EXT4_NAME_LEN 255 1948 1949 struct ext4_dir_entry { 1950 __le32 inode; /* Inode number */ 1951 __le16 rec_len; /* Directory entry length */ 1952 __le16 name_len; /* Name length */ 1953 char name[EXT4_NAME_LEN]; /* File name */ 1954 }; 1955 1956 /* 1957 * The new version of the directory entry. Since EXT4 structures are 1958 * stored in intel byte order, and the name_len field could never be 1959 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1960 * file_type field. 1961 */ 1962 struct ext4_dir_entry_2 { 1963 __le32 inode; /* Inode number */ 1964 __le16 rec_len; /* Directory entry length */ 1965 __u8 name_len; /* Name length */ 1966 __u8 file_type; 1967 char name[EXT4_NAME_LEN]; /* File name */ 1968 }; 1969 1970 /* 1971 * This is a bogus directory entry at the end of each leaf block that 1972 * records checksums. 1973 */ 1974 struct ext4_dir_entry_tail { 1975 __le32 det_reserved_zero1; /* Pretend to be unused */ 1976 __le16 det_rec_len; /* 12 */ 1977 __u8 det_reserved_zero2; /* Zero name length */ 1978 __u8 det_reserved_ft; /* 0xDE, fake file type */ 1979 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1980 }; 1981 1982 #define EXT4_DIRENT_TAIL(block, blocksize) \ 1983 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 1984 ((blocksize) - \ 1985 sizeof(struct ext4_dir_entry_tail)))) 1986 1987 /* 1988 * Ext4 directory file types. Only the low 3 bits are used. The 1989 * other bits are reserved for now. 1990 */ 1991 #define EXT4_FT_UNKNOWN 0 1992 #define EXT4_FT_REG_FILE 1 1993 #define EXT4_FT_DIR 2 1994 #define EXT4_FT_CHRDEV 3 1995 #define EXT4_FT_BLKDEV 4 1996 #define EXT4_FT_FIFO 5 1997 #define EXT4_FT_SOCK 6 1998 #define EXT4_FT_SYMLINK 7 1999 2000 #define EXT4_FT_MAX 8 2001 2002 #define EXT4_FT_DIR_CSUM 0xDE 2003 2004 /* 2005 * EXT4_DIR_PAD defines the directory entries boundaries 2006 * 2007 * NOTE: It must be a multiple of 4 2008 */ 2009 #define EXT4_DIR_PAD 4 2010 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 2011 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 2012 ~EXT4_DIR_ROUND) 2013 #define EXT4_MAX_REC_LEN ((1<<16)-1) 2014 2015 /* 2016 * If we ever get support for fs block sizes > page_size, we'll need 2017 * to remove the #if statements in the next two functions... 2018 */ 2019 static inline unsigned int 2020 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 2021 { 2022 unsigned len = le16_to_cpu(dlen); 2023 2024 #if (PAGE_SIZE >= 65536) 2025 if (len == EXT4_MAX_REC_LEN || len == 0) 2026 return blocksize; 2027 return (len & 65532) | ((len & 3) << 16); 2028 #else 2029 return len; 2030 #endif 2031 } 2032 2033 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 2034 { 2035 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 2036 BUG(); 2037 #if (PAGE_SIZE >= 65536) 2038 if (len < 65536) 2039 return cpu_to_le16(len); 2040 if (len == blocksize) { 2041 if (blocksize == 65536) 2042 return cpu_to_le16(EXT4_MAX_REC_LEN); 2043 else 2044 return cpu_to_le16(0); 2045 } 2046 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 2047 #else 2048 return cpu_to_le16(len); 2049 #endif 2050 } 2051 2052 /* 2053 * Hash Tree Directory indexing 2054 * (c) Daniel Phillips, 2001 2055 */ 2056 2057 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2058 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2059 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \ 2060 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir))) 2061 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2062 2063 /* Legal values for the dx_root hash_version field: */ 2064 2065 #define DX_HASH_LEGACY 0 2066 #define DX_HASH_HALF_MD4 1 2067 #define DX_HASH_TEA 2 2068 #define DX_HASH_LEGACY_UNSIGNED 3 2069 #define DX_HASH_HALF_MD4_UNSIGNED 4 2070 #define DX_HASH_TEA_UNSIGNED 5 2071 2072 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 2073 const void *address, unsigned int length) 2074 { 2075 struct { 2076 struct shash_desc shash; 2077 char ctx[4]; 2078 } desc; 2079 2080 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2081 2082 desc.shash.tfm = sbi->s_chksum_driver; 2083 *(u32 *)desc.ctx = crc; 2084 2085 BUG_ON(crypto_shash_update(&desc.shash, address, length)); 2086 2087 return *(u32 *)desc.ctx; 2088 } 2089 2090 #ifdef __KERNEL__ 2091 2092 /* hash info structure used by the directory hash */ 2093 struct dx_hash_info 2094 { 2095 u32 hash; 2096 u32 minor_hash; 2097 int hash_version; 2098 u32 *seed; 2099 }; 2100 2101 2102 /* 32 and 64 bit signed EOF for dx directories */ 2103 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2104 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2105 2106 2107 /* 2108 * Control parameters used by ext4_htree_next_block 2109 */ 2110 #define HASH_NB_ALWAYS 1 2111 2112 struct ext4_filename { 2113 const struct qstr *usr_fname; 2114 struct fscrypt_str disk_name; 2115 struct dx_hash_info hinfo; 2116 #ifdef CONFIG_FS_ENCRYPTION 2117 struct fscrypt_str crypto_buf; 2118 #endif 2119 #ifdef CONFIG_UNICODE 2120 struct fscrypt_str cf_name; 2121 #endif 2122 }; 2123 2124 #define fname_name(p) ((p)->disk_name.name) 2125 #define fname_len(p) ((p)->disk_name.len) 2126 2127 /* 2128 * Describe an inode's exact location on disk and in memory 2129 */ 2130 struct ext4_iloc 2131 { 2132 struct buffer_head *bh; 2133 unsigned long offset; 2134 ext4_group_t block_group; 2135 }; 2136 2137 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2138 { 2139 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2140 } 2141 2142 static inline bool ext4_is_quota_file(struct inode *inode) 2143 { 2144 return IS_NOQUOTA(inode) && 2145 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL); 2146 } 2147 2148 /* 2149 * This structure is stuffed into the struct file's private_data field 2150 * for directories. It is where we put information so that we can do 2151 * readdir operations in hash tree order. 2152 */ 2153 struct dir_private_info { 2154 struct rb_root root; 2155 struct rb_node *curr_node; 2156 struct fname *extra_fname; 2157 loff_t last_pos; 2158 __u32 curr_hash; 2159 __u32 curr_minor_hash; 2160 __u32 next_hash; 2161 }; 2162 2163 /* calculate the first block number of the group */ 2164 static inline ext4_fsblk_t 2165 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2166 { 2167 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2168 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2169 } 2170 2171 /* 2172 * Special error return code only used by dx_probe() and its callers. 2173 */ 2174 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2175 2176 /* htree levels for ext4 */ 2177 #define EXT4_HTREE_LEVEL_COMPAT 2 2178 #define EXT4_HTREE_LEVEL 3 2179 2180 static inline int ext4_dir_htree_level(struct super_block *sb) 2181 { 2182 return ext4_has_feature_largedir(sb) ? 2183 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT; 2184 } 2185 2186 /* 2187 * Timeout and state flag for lazy initialization inode thread. 2188 */ 2189 #define EXT4_DEF_LI_WAIT_MULT 10 2190 #define EXT4_DEF_LI_MAX_START_DELAY 5 2191 #define EXT4_LAZYINIT_QUIT 0x0001 2192 #define EXT4_LAZYINIT_RUNNING 0x0002 2193 2194 /* 2195 * Lazy inode table initialization info 2196 */ 2197 struct ext4_lazy_init { 2198 unsigned long li_state; 2199 struct list_head li_request_list; 2200 struct mutex li_list_mtx; 2201 }; 2202 2203 struct ext4_li_request { 2204 struct super_block *lr_super; 2205 struct ext4_sb_info *lr_sbi; 2206 ext4_group_t lr_next_group; 2207 struct list_head lr_request; 2208 unsigned long lr_next_sched; 2209 unsigned long lr_timeout; 2210 }; 2211 2212 struct ext4_features { 2213 struct kobject f_kobj; 2214 struct completion f_kobj_unregister; 2215 }; 2216 2217 /* 2218 * This structure will be used for multiple mount protection. It will be 2219 * written into the block number saved in the s_mmp_block field in the 2220 * superblock. Programs that check MMP should assume that if 2221 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2222 * to use the filesystem, regardless of how old the timestamp is. 2223 */ 2224 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2225 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2226 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2227 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2228 2229 struct mmp_struct { 2230 __le32 mmp_magic; /* Magic number for MMP */ 2231 __le32 mmp_seq; /* Sequence no. updated periodically */ 2232 2233 /* 2234 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2235 * purposes and do not affect the correctness of the algorithm 2236 */ 2237 __le64 mmp_time; /* Time last updated */ 2238 char mmp_nodename[64]; /* Node which last updated MMP block */ 2239 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2240 2241 /* 2242 * mmp_check_interval is used to verify if the MMP block has been 2243 * updated on the block device. The value is updated based on the 2244 * maximum time to write the MMP block during an update cycle. 2245 */ 2246 __le16 mmp_check_interval; 2247 2248 __le16 mmp_pad1; 2249 __le32 mmp_pad2[226]; 2250 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2251 }; 2252 2253 /* arguments passed to the mmp thread */ 2254 struct mmpd_data { 2255 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2256 struct super_block *sb; /* super block of the fs */ 2257 }; 2258 2259 /* 2260 * Check interval multiplier 2261 * The MMP block is written every update interval and initially checked every 2262 * update interval x the multiplier (the value is then adapted based on the 2263 * write latency). The reason is that writes can be delayed under load and we 2264 * don't want readers to incorrectly assume that the filesystem is no longer 2265 * in use. 2266 */ 2267 #define EXT4_MMP_CHECK_MULT 2UL 2268 2269 /* 2270 * Minimum interval for MMP checking in seconds. 2271 */ 2272 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2273 2274 /* 2275 * Maximum interval for MMP checking in seconds. 2276 */ 2277 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2278 2279 /* 2280 * Function prototypes 2281 */ 2282 2283 /* 2284 * Ok, these declarations are also in <linux/kernel.h> but none of the 2285 * ext4 source programs needs to include it so they are duplicated here. 2286 */ 2287 # define NORET_TYPE /**/ 2288 # define ATTRIB_NORET __attribute__((noreturn)) 2289 # define NORET_AND noreturn, 2290 2291 /* bitmap.c */ 2292 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2293 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2294 struct ext4_group_desc *gdp, 2295 struct buffer_head *bh, int sz); 2296 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2297 struct ext4_group_desc *gdp, 2298 struct buffer_head *bh, int sz); 2299 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2300 struct ext4_group_desc *gdp, 2301 struct buffer_head *bh); 2302 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2303 struct ext4_group_desc *gdp, 2304 struct buffer_head *bh); 2305 2306 /* balloc.c */ 2307 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2308 ext4_fsblk_t blocknr, 2309 ext4_group_t *blockgrpp, 2310 ext4_grpblk_t *offsetp); 2311 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2312 ext4_fsblk_t block); 2313 2314 extern unsigned int ext4_block_group(struct super_block *sb, 2315 ext4_fsblk_t blocknr); 2316 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2317 ext4_fsblk_t blocknr); 2318 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2319 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2320 ext4_group_t group); 2321 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2322 ext4_fsblk_t goal, 2323 unsigned int flags, 2324 unsigned long *count, 2325 int *errp); 2326 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2327 s64 nclusters, unsigned int flags); 2328 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2329 extern void ext4_check_blocks_bitmap(struct super_block *); 2330 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2331 ext4_group_t block_group, 2332 struct buffer_head ** bh); 2333 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2334 2335 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2336 ext4_group_t block_group); 2337 extern int ext4_wait_block_bitmap(struct super_block *sb, 2338 ext4_group_t block_group, 2339 struct buffer_head *bh); 2340 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2341 ext4_group_t block_group); 2342 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2343 ext4_group_t block_group, 2344 struct ext4_group_desc *gdp); 2345 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2346 2347 #ifdef CONFIG_UNICODE 2348 extern void ext4_fname_setup_ci_filename(struct inode *dir, 2349 const struct qstr *iname, 2350 struct fscrypt_str *fname); 2351 #endif 2352 2353 #ifdef CONFIG_FS_ENCRYPTION 2354 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst, 2355 const struct fscrypt_name *src) 2356 { 2357 memset(dst, 0, sizeof(*dst)); 2358 2359 dst->usr_fname = src->usr_fname; 2360 dst->disk_name = src->disk_name; 2361 dst->hinfo.hash = src->hash; 2362 dst->hinfo.minor_hash = src->minor_hash; 2363 dst->crypto_buf = src->crypto_buf; 2364 } 2365 2366 static inline int ext4_fname_setup_filename(struct inode *dir, 2367 const struct qstr *iname, 2368 int lookup, 2369 struct ext4_filename *fname) 2370 { 2371 struct fscrypt_name name; 2372 int err; 2373 2374 err = fscrypt_setup_filename(dir, iname, lookup, &name); 2375 if (err) 2376 return err; 2377 2378 ext4_fname_from_fscrypt_name(fname, &name); 2379 2380 #ifdef CONFIG_UNICODE 2381 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name); 2382 #endif 2383 return 0; 2384 } 2385 2386 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2387 struct dentry *dentry, 2388 struct ext4_filename *fname) 2389 { 2390 struct fscrypt_name name; 2391 int err; 2392 2393 err = fscrypt_prepare_lookup(dir, dentry, &name); 2394 if (err) 2395 return err; 2396 2397 ext4_fname_from_fscrypt_name(fname, &name); 2398 2399 #ifdef CONFIG_UNICODE 2400 ext4_fname_setup_ci_filename(dir, &dentry->d_name, &fname->cf_name); 2401 #endif 2402 return 0; 2403 } 2404 2405 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2406 { 2407 struct fscrypt_name name; 2408 2409 name.crypto_buf = fname->crypto_buf; 2410 fscrypt_free_filename(&name); 2411 2412 fname->crypto_buf.name = NULL; 2413 fname->usr_fname = NULL; 2414 fname->disk_name.name = NULL; 2415 2416 #ifdef CONFIG_UNICODE 2417 kfree(fname->cf_name.name); 2418 fname->cf_name.name = NULL; 2419 #endif 2420 } 2421 #else /* !CONFIG_FS_ENCRYPTION */ 2422 static inline int ext4_fname_setup_filename(struct inode *dir, 2423 const struct qstr *iname, 2424 int lookup, 2425 struct ext4_filename *fname) 2426 { 2427 fname->usr_fname = iname; 2428 fname->disk_name.name = (unsigned char *) iname->name; 2429 fname->disk_name.len = iname->len; 2430 2431 #ifdef CONFIG_UNICODE 2432 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name); 2433 #endif 2434 2435 return 0; 2436 } 2437 2438 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2439 struct dentry *dentry, 2440 struct ext4_filename *fname) 2441 { 2442 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname); 2443 } 2444 2445 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2446 { 2447 #ifdef CONFIG_UNICODE 2448 kfree(fname->cf_name.name); 2449 fname->cf_name.name = NULL; 2450 #endif 2451 } 2452 #endif /* !CONFIG_FS_ENCRYPTION */ 2453 2454 /* dir.c */ 2455 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2456 struct file *, 2457 struct ext4_dir_entry_2 *, 2458 struct buffer_head *, char *, int, 2459 unsigned int); 2460 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2461 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2462 (de), (bh), (buf), (size), (offset))) 2463 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2464 __u32 minor_hash, 2465 struct ext4_dir_entry_2 *dirent, 2466 struct fscrypt_str *ent_name); 2467 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2468 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2469 struct buffer_head *bh, 2470 void *buf, int buf_size, 2471 struct ext4_filename *fname, 2472 struct ext4_dir_entry_2 **dest_de); 2473 void ext4_insert_dentry(struct inode *inode, 2474 struct ext4_dir_entry_2 *de, 2475 int buf_size, 2476 struct ext4_filename *fname); 2477 static inline void ext4_update_dx_flag(struct inode *inode) 2478 { 2479 if (!ext4_has_feature_dir_index(inode->i_sb)) 2480 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2481 } 2482 static const unsigned char ext4_filetype_table[] = { 2483 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2484 }; 2485 2486 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2487 { 2488 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2489 return DT_UNKNOWN; 2490 2491 return ext4_filetype_table[filetype]; 2492 } 2493 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2494 void *buf, int buf_size); 2495 2496 /* fsync.c */ 2497 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2498 2499 /* hash.c */ 2500 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len, 2501 struct dx_hash_info *hinfo); 2502 2503 /* ialloc.c */ 2504 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2505 const struct qstr *qstr, __u32 goal, 2506 uid_t *owner, __u32 i_flags, 2507 int handle_type, unsigned int line_no, 2508 int nblocks); 2509 2510 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \ 2511 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2512 i_flags, 0, 0, 0) 2513 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2514 type, nblocks) \ 2515 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2516 0, (type), __LINE__, (nblocks)) 2517 2518 2519 extern void ext4_free_inode(handle_t *, struct inode *); 2520 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2521 extern unsigned long ext4_count_free_inodes(struct super_block *); 2522 extern unsigned long ext4_count_dirs(struct super_block *); 2523 extern void ext4_check_inodes_bitmap(struct super_block *); 2524 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2525 extern int ext4_init_inode_table(struct super_block *sb, 2526 ext4_group_t group, int barrier); 2527 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2528 2529 /* mballoc.c */ 2530 extern const struct seq_operations ext4_mb_seq_groups_ops; 2531 extern long ext4_mb_stats; 2532 extern long ext4_mb_max_to_scan; 2533 extern int ext4_mb_init(struct super_block *); 2534 extern int ext4_mb_release(struct super_block *); 2535 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2536 struct ext4_allocation_request *, int *); 2537 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2538 extern void ext4_discard_preallocations(struct inode *); 2539 extern int __init ext4_init_mballoc(void); 2540 extern void ext4_exit_mballoc(void); 2541 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2542 struct buffer_head *bh, ext4_fsblk_t block, 2543 unsigned long count, int flags); 2544 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2545 ext4_group_t ngroups); 2546 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2547 ext4_group_t i, struct ext4_group_desc *desc); 2548 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2549 ext4_fsblk_t block, unsigned long count); 2550 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2551 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid); 2552 2553 /* inode.c */ 2554 int ext4_inode_is_fast_symlink(struct inode *inode); 2555 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2556 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2557 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count, 2558 bool wait, struct buffer_head **bhs); 2559 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2560 struct buffer_head *bh_result, int create); 2561 int ext4_get_block(struct inode *inode, sector_t iblock, 2562 struct buffer_head *bh_result, int create); 2563 int ext4_dio_get_block(struct inode *inode, sector_t iblock, 2564 struct buffer_head *bh_result, int create); 2565 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2566 struct buffer_head *bh, int create); 2567 int ext4_walk_page_buffers(handle_t *handle, 2568 struct buffer_head *head, 2569 unsigned from, 2570 unsigned to, 2571 int *partial, 2572 int (*fn)(handle_t *handle, 2573 struct buffer_head *bh)); 2574 int do_journal_get_write_access(handle_t *handle, 2575 struct buffer_head *bh); 2576 #define FALL_BACK_TO_NONDELALLOC 1 2577 #define CONVERT_INLINE_DATA 2 2578 2579 typedef enum { 2580 EXT4_IGET_NORMAL = 0, 2581 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */ 2582 EXT4_IGET_HANDLE = 0x0002 /* Inode # is from a handle */ 2583 } ext4_iget_flags; 2584 2585 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, 2586 ext4_iget_flags flags, const char *function, 2587 unsigned int line); 2588 2589 #define ext4_iget(sb, ino, flags) \ 2590 __ext4_iget((sb), (ino), (flags), __func__, __LINE__) 2591 2592 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2593 extern int ext4_setattr(struct dentry *, struct iattr *); 2594 extern int ext4_getattr(const struct path *, struct kstat *, u32, unsigned int); 2595 extern void ext4_evict_inode(struct inode *); 2596 extern void ext4_clear_inode(struct inode *); 2597 extern int ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int); 2598 extern int ext4_sync_inode(handle_t *, struct inode *); 2599 extern void ext4_dirty_inode(struct inode *, int); 2600 extern int ext4_change_inode_journal_flag(struct inode *, int); 2601 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2602 extern int ext4_inode_attach_jinode(struct inode *inode); 2603 extern int ext4_can_truncate(struct inode *inode); 2604 extern int ext4_truncate(struct inode *); 2605 extern int ext4_break_layouts(struct inode *); 2606 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2607 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 2608 extern void ext4_set_inode_flags(struct inode *); 2609 extern int ext4_alloc_da_blocks(struct inode *inode); 2610 extern void ext4_set_aops(struct inode *inode); 2611 extern int ext4_writepage_trans_blocks(struct inode *); 2612 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2613 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2614 loff_t lstart, loff_t lend); 2615 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf); 2616 extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf); 2617 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2618 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 2619 extern void ext4_da_release_space(struct inode *inode, int to_free); 2620 extern void ext4_da_update_reserve_space(struct inode *inode, 2621 int used, int quota_claim); 2622 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 2623 ext4_fsblk_t pblk, ext4_lblk_t len); 2624 2625 /* indirect.c */ 2626 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2627 struct ext4_map_blocks *map, int flags); 2628 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2629 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2630 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2631 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2632 ext4_lblk_t start, ext4_lblk_t end); 2633 2634 /* ioctl.c */ 2635 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2636 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2637 2638 /* migrate.c */ 2639 extern int ext4_ext_migrate(struct inode *); 2640 extern int ext4_ind_migrate(struct inode *inode); 2641 2642 /* namei.c */ 2643 extern int ext4_dirblock_csum_verify(struct inode *inode, 2644 struct buffer_head *bh); 2645 extern int ext4_orphan_add(handle_t *, struct inode *); 2646 extern int ext4_orphan_del(handle_t *, struct inode *); 2647 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2648 __u32 start_minor_hash, __u32 *next_hash); 2649 extern int ext4_search_dir(struct buffer_head *bh, 2650 char *search_buf, 2651 int buf_size, 2652 struct inode *dir, 2653 struct ext4_filename *fname, 2654 unsigned int offset, 2655 struct ext4_dir_entry_2 **res_dir); 2656 extern int ext4_generic_delete_entry(handle_t *handle, 2657 struct inode *dir, 2658 struct ext4_dir_entry_2 *de_del, 2659 struct buffer_head *bh, 2660 void *entry_buf, 2661 int buf_size, 2662 int csum_size); 2663 extern bool ext4_empty_dir(struct inode *inode); 2664 2665 /* resize.c */ 2666 extern int ext4_group_add(struct super_block *sb, 2667 struct ext4_new_group_data *input); 2668 extern int ext4_group_extend(struct super_block *sb, 2669 struct ext4_super_block *es, 2670 ext4_fsblk_t n_blocks_count); 2671 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2672 2673 /* super.c */ 2674 extern struct buffer_head *ext4_sb_bread(struct super_block *sb, 2675 sector_t block, int op_flags); 2676 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 2677 extern int ext4_calculate_overhead(struct super_block *sb); 2678 extern void ext4_superblock_csum_set(struct super_block *sb); 2679 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 2680 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 2681 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2682 ext4_group_t ngroup); 2683 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2684 char nbuf[16]); 2685 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb, 2686 ext4_group_t block_group, 2687 unsigned int flags); 2688 2689 extern __printf(4, 5) 2690 void __ext4_error(struct super_block *, const char *, unsigned int, 2691 const char *, ...); 2692 extern __printf(5, 6) 2693 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2694 const char *, ...); 2695 extern __printf(5, 6) 2696 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2697 const char *, ...); 2698 extern void __ext4_std_error(struct super_block *, const char *, 2699 unsigned int, int); 2700 extern __printf(4, 5) 2701 void __ext4_abort(struct super_block *, const char *, unsigned int, 2702 const char *, ...); 2703 extern __printf(4, 5) 2704 void __ext4_warning(struct super_block *, const char *, unsigned int, 2705 const char *, ...); 2706 extern __printf(4, 5) 2707 void __ext4_warning_inode(const struct inode *inode, const char *function, 2708 unsigned int line, const char *fmt, ...); 2709 extern __printf(3, 4) 2710 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2711 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2712 const char *, unsigned int, const char *); 2713 extern __printf(7, 8) 2714 void __ext4_grp_locked_error(const char *, unsigned int, 2715 struct super_block *, ext4_group_t, 2716 unsigned long, ext4_fsblk_t, 2717 const char *, ...); 2718 2719 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 2720 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 2721 2722 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 2723 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 2724 2725 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 2726 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 2727 2728 #ifdef CONFIG_PRINTK 2729 2730 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2731 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__) 2732 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2733 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2734 #define ext4_error(sb, fmt, ...) \ 2735 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2736 #define ext4_abort(sb, fmt, ...) \ 2737 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2738 #define ext4_warning(sb, fmt, ...) \ 2739 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2740 #define ext4_warning_inode(inode, fmt, ...) \ 2741 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 2742 #define ext4_msg(sb, level, fmt, ...) \ 2743 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 2744 #define dump_mmp_msg(sb, mmp, msg) \ 2745 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 2746 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2747 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 2748 fmt, ##__VA_ARGS__) 2749 2750 #else 2751 2752 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2753 do { \ 2754 no_printk(fmt, ##__VA_ARGS__); \ 2755 __ext4_error_inode(inode, "", 0, block, " "); \ 2756 } while (0) 2757 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2758 do { \ 2759 no_printk(fmt, ##__VA_ARGS__); \ 2760 __ext4_error_file(file, "", 0, block, " "); \ 2761 } while (0) 2762 #define ext4_error(sb, fmt, ...) \ 2763 do { \ 2764 no_printk(fmt, ##__VA_ARGS__); \ 2765 __ext4_error(sb, "", 0, " "); \ 2766 } while (0) 2767 #define ext4_abort(sb, fmt, ...) \ 2768 do { \ 2769 no_printk(fmt, ##__VA_ARGS__); \ 2770 __ext4_abort(sb, "", 0, " "); \ 2771 } while (0) 2772 #define ext4_warning(sb, fmt, ...) \ 2773 do { \ 2774 no_printk(fmt, ##__VA_ARGS__); \ 2775 __ext4_warning(sb, "", 0, " "); \ 2776 } while (0) 2777 #define ext4_warning_inode(inode, fmt, ...) \ 2778 do { \ 2779 no_printk(fmt, ##__VA_ARGS__); \ 2780 __ext4_warning_inode(inode, "", 0, " "); \ 2781 } while (0) 2782 #define ext4_msg(sb, level, fmt, ...) \ 2783 do { \ 2784 no_printk(fmt, ##__VA_ARGS__); \ 2785 __ext4_msg(sb, "", " "); \ 2786 } while (0) 2787 #define dump_mmp_msg(sb, mmp, msg) \ 2788 __dump_mmp_msg(sb, mmp, "", 0, "") 2789 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2790 do { \ 2791 no_printk(fmt, ##__VA_ARGS__); \ 2792 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 2793 } while (0) 2794 2795 #endif 2796 2797 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2798 __u32 compat); 2799 extern int ext4_update_rocompat_feature(handle_t *handle, 2800 struct super_block *sb, __u32 rocompat); 2801 extern int ext4_update_incompat_feature(handle_t *handle, 2802 struct super_block *sb, __u32 incompat); 2803 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2804 struct ext4_group_desc *bg); 2805 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2806 struct ext4_group_desc *bg); 2807 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2808 struct ext4_group_desc *bg); 2809 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2810 struct ext4_group_desc *bg); 2811 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2812 struct ext4_group_desc *bg); 2813 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2814 struct ext4_group_desc *bg); 2815 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2816 struct ext4_group_desc *bg); 2817 extern void ext4_block_bitmap_set(struct super_block *sb, 2818 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2819 extern void ext4_inode_bitmap_set(struct super_block *sb, 2820 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2821 extern void ext4_inode_table_set(struct super_block *sb, 2822 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2823 extern void ext4_free_group_clusters_set(struct super_block *sb, 2824 struct ext4_group_desc *bg, 2825 __u32 count); 2826 extern void ext4_free_inodes_set(struct super_block *sb, 2827 struct ext4_group_desc *bg, __u32 count); 2828 extern void ext4_used_dirs_set(struct super_block *sb, 2829 struct ext4_group_desc *bg, __u32 count); 2830 extern void ext4_itable_unused_set(struct super_block *sb, 2831 struct ext4_group_desc *bg, __u32 count); 2832 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2833 struct ext4_group_desc *gdp); 2834 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2835 struct ext4_group_desc *gdp); 2836 extern int ext4_register_li_request(struct super_block *sb, 2837 ext4_group_t first_not_zeroed); 2838 2839 static inline int ext4_has_metadata_csum(struct super_block *sb) 2840 { 2841 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 2842 !EXT4_SB(sb)->s_chksum_driver); 2843 2844 return ext4_has_feature_metadata_csum(sb) && 2845 (EXT4_SB(sb)->s_chksum_driver != NULL); 2846 } 2847 2848 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2849 { 2850 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb); 2851 } 2852 2853 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2854 { 2855 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2856 le32_to_cpu(es->s_blocks_count_lo); 2857 } 2858 2859 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2860 { 2861 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2862 le32_to_cpu(es->s_r_blocks_count_lo); 2863 } 2864 2865 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2866 { 2867 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2868 le32_to_cpu(es->s_free_blocks_count_lo); 2869 } 2870 2871 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2872 ext4_fsblk_t blk) 2873 { 2874 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2875 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2876 } 2877 2878 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2879 ext4_fsblk_t blk) 2880 { 2881 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2882 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2883 } 2884 2885 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2886 ext4_fsblk_t blk) 2887 { 2888 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2889 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2890 } 2891 2892 static inline loff_t ext4_isize(struct super_block *sb, 2893 struct ext4_inode *raw_inode) 2894 { 2895 if (ext4_has_feature_largedir(sb) || 2896 S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2897 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2898 le32_to_cpu(raw_inode->i_size_lo); 2899 2900 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2901 } 2902 2903 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2904 { 2905 raw_inode->i_size_lo = cpu_to_le32(i_size); 2906 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2907 } 2908 2909 static inline 2910 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2911 ext4_group_t group) 2912 { 2913 struct ext4_group_info ***grp_info; 2914 long indexv, indexh; 2915 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 2916 grp_info = EXT4_SB(sb)->s_group_info; 2917 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2918 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2919 return grp_info[indexv][indexh]; 2920 } 2921 2922 /* 2923 * Reading s_groups_count requires using smp_rmb() afterwards. See 2924 * the locking protocol documented in the comments of ext4_group_add() 2925 * in resize.c 2926 */ 2927 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2928 { 2929 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2930 2931 smp_rmb(); 2932 return ngroups; 2933 } 2934 2935 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2936 ext4_group_t block_group) 2937 { 2938 return block_group >> sbi->s_log_groups_per_flex; 2939 } 2940 2941 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2942 { 2943 return 1 << sbi->s_log_groups_per_flex; 2944 } 2945 2946 #define ext4_std_error(sb, errno) \ 2947 do { \ 2948 if ((errno)) \ 2949 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2950 } while (0) 2951 2952 #ifdef CONFIG_SMP 2953 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2954 * counters. So we need to make sure we have free clusters more 2955 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2956 */ 2957 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2958 #else 2959 #define EXT4_FREECLUSTERS_WATERMARK 0 2960 #endif 2961 2962 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 2963 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2964 { 2965 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 2966 !inode_is_locked(inode)); 2967 down_write(&EXT4_I(inode)->i_data_sem); 2968 if (newsize > EXT4_I(inode)->i_disksize) 2969 EXT4_I(inode)->i_disksize = newsize; 2970 up_write(&EXT4_I(inode)->i_data_sem); 2971 } 2972 2973 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 2974 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 2975 { 2976 int changed = 0; 2977 2978 if (newsize > inode->i_size) { 2979 i_size_write(inode, newsize); 2980 changed = 1; 2981 } 2982 if (newsize > EXT4_I(inode)->i_disksize) { 2983 ext4_update_i_disksize(inode, newsize); 2984 changed |= 2; 2985 } 2986 return changed; 2987 } 2988 2989 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 2990 loff_t len); 2991 2992 struct ext4_group_info { 2993 unsigned long bb_state; 2994 struct rb_root bb_free_root; 2995 ext4_grpblk_t bb_first_free; /* first free block */ 2996 ext4_grpblk_t bb_free; /* total free blocks */ 2997 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 2998 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 2999 struct list_head bb_prealloc_list; 3000 #ifdef DOUBLE_CHECK 3001 void *bb_bitmap; 3002 #endif 3003 struct rw_semaphore alloc_sem; 3004 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 3005 * regions, index is order. 3006 * bb_counters[3] = 5 means 3007 * 5 free 8-block regions. */ 3008 }; 3009 3010 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 3011 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 3012 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 3013 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 3014 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \ 3015 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT) 3016 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \ 3017 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT) 3018 3019 #define EXT4_MB_GRP_NEED_INIT(grp) \ 3020 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 3021 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 3022 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3023 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 3024 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3025 3026 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 3027 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3028 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 3029 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3030 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 3031 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3032 3033 #define EXT4_MAX_CONTENTION 8 3034 #define EXT4_CONTENTION_THRESHOLD 2 3035 3036 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 3037 ext4_group_t group) 3038 { 3039 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 3040 } 3041 3042 /* 3043 * Returns true if the filesystem is busy enough that attempts to 3044 * access the block group locks has run into contention. 3045 */ 3046 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 3047 { 3048 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 3049 } 3050 3051 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 3052 { 3053 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 3054 if (spin_trylock(lock)) 3055 /* 3056 * We're able to grab the lock right away, so drop the 3057 * lock contention counter. 3058 */ 3059 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 3060 else { 3061 /* 3062 * The lock is busy, so bump the contention counter, 3063 * and then wait on the spin lock. 3064 */ 3065 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 3066 EXT4_MAX_CONTENTION); 3067 spin_lock(lock); 3068 } 3069 } 3070 3071 static inline void ext4_unlock_group(struct super_block *sb, 3072 ext4_group_t group) 3073 { 3074 spin_unlock(ext4_group_lock_ptr(sb, group)); 3075 } 3076 3077 /* 3078 * Block validity checking 3079 */ 3080 #define ext4_check_indirect_blockref(inode, bh) \ 3081 ext4_check_blockref(__func__, __LINE__, inode, \ 3082 (__le32 *)(bh)->b_data, \ 3083 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 3084 3085 #define ext4_ind_check_inode(inode) \ 3086 ext4_check_blockref(__func__, __LINE__, inode, \ 3087 EXT4_I(inode)->i_data, \ 3088 EXT4_NDIR_BLOCKS) 3089 3090 /* 3091 * Inodes and files operations 3092 */ 3093 3094 /* dir.c */ 3095 extern const struct file_operations ext4_dir_operations; 3096 3097 #ifdef CONFIG_UNICODE 3098 extern const struct dentry_operations ext4_dentry_ops; 3099 #endif 3100 3101 /* file.c */ 3102 extern const struct inode_operations ext4_file_inode_operations; 3103 extern const struct file_operations ext4_file_operations; 3104 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 3105 3106 /* inline.c */ 3107 extern int ext4_get_max_inline_size(struct inode *inode); 3108 extern int ext4_find_inline_data_nolock(struct inode *inode); 3109 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 3110 unsigned int len); 3111 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 3112 3113 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 3114 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 3115 struct inode *inode, 3116 loff_t pos, unsigned len, 3117 unsigned flags, 3118 struct page **pagep); 3119 extern int ext4_write_inline_data_end(struct inode *inode, 3120 loff_t pos, unsigned len, 3121 unsigned copied, 3122 struct page *page); 3123 extern struct buffer_head * 3124 ext4_journalled_write_inline_data(struct inode *inode, 3125 unsigned len, 3126 struct page *page); 3127 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 3128 struct inode *inode, 3129 loff_t pos, unsigned len, 3130 unsigned flags, 3131 struct page **pagep, 3132 void **fsdata); 3133 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 3134 unsigned len, unsigned copied, 3135 struct page *page); 3136 extern int ext4_try_add_inline_entry(handle_t *handle, 3137 struct ext4_filename *fname, 3138 struct inode *dir, struct inode *inode); 3139 extern int ext4_try_create_inline_dir(handle_t *handle, 3140 struct inode *parent, 3141 struct inode *inode); 3142 extern int ext4_read_inline_dir(struct file *filp, 3143 struct dir_context *ctx, 3144 int *has_inline_data); 3145 extern int ext4_inlinedir_to_tree(struct file *dir_file, 3146 struct inode *dir, ext4_lblk_t block, 3147 struct dx_hash_info *hinfo, 3148 __u32 start_hash, __u32 start_minor_hash, 3149 int *has_inline_data); 3150 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3151 struct ext4_filename *fname, 3152 struct ext4_dir_entry_2 **res_dir, 3153 int *has_inline_data); 3154 extern int ext4_delete_inline_entry(handle_t *handle, 3155 struct inode *dir, 3156 struct ext4_dir_entry_2 *de_del, 3157 struct buffer_head *bh, 3158 int *has_inline_data); 3159 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); 3160 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3161 struct ext4_dir_entry_2 **parent_de, 3162 int *retval); 3163 extern int ext4_inline_data_fiemap(struct inode *inode, 3164 struct fiemap_extent_info *fieinfo, 3165 int *has_inline, __u64 start, __u64 len); 3166 3167 struct iomap; 3168 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap); 3169 3170 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3171 3172 extern int ext4_convert_inline_data(struct inode *inode); 3173 3174 static inline int ext4_has_inline_data(struct inode *inode) 3175 { 3176 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3177 EXT4_I(inode)->i_inline_off; 3178 } 3179 3180 /* namei.c */ 3181 extern const struct inode_operations ext4_dir_inode_operations; 3182 extern const struct inode_operations ext4_special_inode_operations; 3183 extern struct dentry *ext4_get_parent(struct dentry *child); 3184 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3185 struct ext4_dir_entry_2 *de, 3186 int blocksize, int csum_size, 3187 unsigned int parent_ino, int dotdot_real_len); 3188 extern void ext4_initialize_dirent_tail(struct buffer_head *bh, 3189 unsigned int blocksize); 3190 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode, 3191 struct buffer_head *bh); 3192 extern int ext4_ci_compare(const struct inode *parent, 3193 const struct qstr *fname, 3194 const struct qstr *entry, bool quick); 3195 3196 #define S_SHIFT 12 3197 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = { 3198 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3199 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3200 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3201 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3202 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3203 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3204 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3205 }; 3206 3207 static inline void ext4_set_de_type(struct super_block *sb, 3208 struct ext4_dir_entry_2 *de, 3209 umode_t mode) { 3210 if (ext4_has_feature_filetype(sb)) 3211 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3212 } 3213 3214 /* readpages.c */ 3215 extern int ext4_mpage_readpages(struct address_space *mapping, 3216 struct list_head *pages, struct page *page, 3217 unsigned nr_pages, bool is_readahead); 3218 extern int __init ext4_init_post_read_processing(void); 3219 extern void ext4_exit_post_read_processing(void); 3220 3221 /* symlink.c */ 3222 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3223 extern const struct inode_operations ext4_symlink_inode_operations; 3224 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3225 3226 /* sysfs.c */ 3227 extern int ext4_register_sysfs(struct super_block *sb); 3228 extern void ext4_unregister_sysfs(struct super_block *sb); 3229 extern int __init ext4_init_sysfs(void); 3230 extern void ext4_exit_sysfs(void); 3231 3232 /* block_validity */ 3233 extern void ext4_release_system_zone(struct super_block *sb); 3234 extern int ext4_setup_system_zone(struct super_block *sb); 3235 extern int __init ext4_init_system_zone(void); 3236 extern void ext4_exit_system_zone(void); 3237 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 3238 ext4_fsblk_t start_blk, 3239 unsigned int count); 3240 extern int ext4_check_blockref(const char *, unsigned int, 3241 struct inode *, __le32 *, unsigned int); 3242 3243 /* extents.c */ 3244 struct ext4_ext_path; 3245 struct ext4_extent; 3246 3247 /* 3248 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3249 * __le32. 3250 */ 3251 #define EXT_MAX_BLOCKS 0xffffffff 3252 3253 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 3254 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 3255 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3256 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3257 struct ext4_map_blocks *map, int flags); 3258 extern int ext4_ext_truncate(handle_t *, struct inode *); 3259 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3260 ext4_lblk_t end); 3261 extern void ext4_ext_init(struct super_block *); 3262 extern void ext4_ext_release(struct super_block *); 3263 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3264 loff_t len); 3265 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3266 loff_t offset, ssize_t len); 3267 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3268 struct ext4_map_blocks *map, int flags); 3269 extern int ext4_ext_calc_metadata_amount(struct inode *inode, 3270 ext4_lblk_t lblocks); 3271 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3272 int num, 3273 struct ext4_ext_path *path); 3274 extern int ext4_can_extents_be_merged(struct inode *inode, 3275 struct ext4_extent *ex1, 3276 struct ext4_extent *ex2); 3277 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3278 struct ext4_ext_path **, 3279 struct ext4_extent *, int); 3280 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3281 struct ext4_ext_path **, 3282 int flags); 3283 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 3284 extern int ext4_ext_check_inode(struct inode *inode); 3285 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3286 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3287 __u64 start, __u64 len); 3288 extern int ext4_get_es_cache(struct inode *inode, 3289 struct fiemap_extent_info *fieinfo, 3290 __u64 start, __u64 len); 3291 extern int ext4_ext_precache(struct inode *inode); 3292 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len); 3293 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len); 3294 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3295 struct inode *inode2, ext4_lblk_t lblk1, 3296 ext4_lblk_t lblk2, ext4_lblk_t count, 3297 int mark_unwritten,int *err); 3298 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu); 3299 3300 /* move_extent.c */ 3301 extern void ext4_double_down_write_data_sem(struct inode *first, 3302 struct inode *second); 3303 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3304 struct inode *donor_inode); 3305 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3306 __u64 start_orig, __u64 start_donor, 3307 __u64 len, __u64 *moved_len); 3308 3309 /* page-io.c */ 3310 extern int __init ext4_init_pageio(void); 3311 extern void ext4_exit_pageio(void); 3312 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3313 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3314 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3315 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3316 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3317 struct writeback_control *wbc); 3318 extern void ext4_end_io_rsv_work(struct work_struct *work); 3319 extern void ext4_io_submit(struct ext4_io_submit *io); 3320 extern int ext4_bio_write_page(struct ext4_io_submit *io, 3321 struct page *page, 3322 int len, 3323 struct writeback_control *wbc, 3324 bool keep_towrite); 3325 3326 /* mmp.c */ 3327 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3328 3329 /* verity.c */ 3330 extern const struct fsverity_operations ext4_verityops; 3331 3332 /* 3333 * Add new method to test whether block and inode bitmaps are properly 3334 * initialized. With uninit_bg reading the block from disk is not enough 3335 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3336 */ 3337 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3338 3339 static inline int bitmap_uptodate(struct buffer_head *bh) 3340 { 3341 return (buffer_uptodate(bh) && 3342 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3343 } 3344 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3345 { 3346 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3347 } 3348 3349 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3350 3351 /* For ioend & aio unwritten conversion wait queues */ 3352 #define EXT4_WQ_HASH_SZ 37 3353 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3354 EXT4_WQ_HASH_SZ]) 3355 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3356 3357 extern int ext4_resize_begin(struct super_block *sb); 3358 extern void ext4_resize_end(struct super_block *sb); 3359 3360 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 3361 struct ext4_io_end *io_end) 3362 { 3363 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 3364 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3365 atomic_inc(&EXT4_I(inode)->i_unwritten); 3366 } 3367 } 3368 3369 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3370 { 3371 struct inode *inode = io_end->inode; 3372 3373 if (io_end->flag & EXT4_IO_END_UNWRITTEN) { 3374 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3375 /* Wake up anyone waiting on unwritten extent conversion */ 3376 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) 3377 wake_up_all(ext4_ioend_wq(inode)); 3378 } 3379 } 3380 3381 extern const struct iomap_ops ext4_iomap_ops; 3382 3383 static inline int ext4_buffer_uptodate(struct buffer_head *bh) 3384 { 3385 /* 3386 * If the buffer has the write error flag, we have failed 3387 * to write out data in the block. In this case, we don't 3388 * have to read the block because we may read the old data 3389 * successfully. 3390 */ 3391 if (!buffer_uptodate(bh) && buffer_write_io_error(bh)) 3392 set_buffer_uptodate(bh); 3393 return buffer_uptodate(bh); 3394 } 3395 3396 #endif /* __KERNEL__ */ 3397 3398 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3399 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3400 3401 #endif /* _EXT4_H */ 3402