1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * ext4.h 4 * 5 * Copyright (C) 1992, 1993, 1994, 1995 6 * Remy Card (card@masi.ibp.fr) 7 * Laboratoire MASI - Institut Blaise Pascal 8 * Universite Pierre et Marie Curie (Paris VI) 9 * 10 * from 11 * 12 * linux/include/linux/minix_fs.h 13 * 14 * Copyright (C) 1991, 1992 Linus Torvalds 15 */ 16 17 #ifndef _EXT4_H 18 #define _EXT4_H 19 20 #include <linux/types.h> 21 #include <linux/blkdev.h> 22 #include <linux/magic.h> 23 #include <linux/jbd2.h> 24 #include <linux/quota.h> 25 #include <linux/rwsem.h> 26 #include <linux/rbtree.h> 27 #include <linux/seqlock.h> 28 #include <linux/mutex.h> 29 #include <linux/timer.h> 30 #include <linux/version.h> 31 #include <linux/wait.h> 32 #include <linux/sched/signal.h> 33 #include <linux/blockgroup_lock.h> 34 #include <linux/percpu_counter.h> 35 #include <linux/ratelimit.h> 36 #include <crypto/hash.h> 37 #include <linux/falloc.h> 38 #include <linux/percpu-rwsem.h> 39 #ifdef __KERNEL__ 40 #include <linux/compat.h> 41 #endif 42 43 #include <linux/fscrypt.h> 44 #include <linux/fsverity.h> 45 46 #include <linux/compiler.h> 47 48 /* 49 * The fourth extended filesystem constants/structures 50 */ 51 52 /* 53 * with AGGRESSIVE_CHECK allocator runs consistency checks over 54 * structures. these checks slow things down a lot 55 */ 56 #define AGGRESSIVE_CHECK__ 57 58 /* 59 * with DOUBLE_CHECK defined mballoc creates persistent in-core 60 * bitmaps, maintains and uses them to check for double allocations 61 */ 62 #define DOUBLE_CHECK__ 63 64 /* 65 * Define EXT4FS_DEBUG to produce debug messages 66 */ 67 #undef EXT4FS_DEBUG 68 69 /* 70 * Debug code 71 */ 72 #ifdef EXT4FS_DEBUG 73 #define ext4_debug(f, a...) \ 74 do { \ 75 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 76 __FILE__, __LINE__, __func__); \ 77 printk(KERN_DEBUG f, ## a); \ 78 } while (0) 79 #else 80 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 81 #endif 82 83 /* 84 * Turn on EXT_DEBUG to get lots of info about extents operations. 85 */ 86 #define EXT_DEBUG__ 87 #ifdef EXT_DEBUG 88 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__) 89 #else 90 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 91 #endif 92 93 /* data type for block offset of block group */ 94 typedef int ext4_grpblk_t; 95 96 /* data type for filesystem-wide blocks number */ 97 typedef unsigned long long ext4_fsblk_t; 98 99 /* data type for file logical block number */ 100 typedef __u32 ext4_lblk_t; 101 102 /* data type for block group number */ 103 typedef unsigned int ext4_group_t; 104 105 enum SHIFT_DIRECTION { 106 SHIFT_LEFT = 0, 107 SHIFT_RIGHT, 108 }; 109 110 /* 111 * Flags used in mballoc's allocation_context flags field. 112 * 113 * Also used to show what's going on for debugging purposes when the 114 * flag field is exported via the traceport interface 115 */ 116 117 /* prefer goal again. length */ 118 #define EXT4_MB_HINT_MERGE 0x0001 119 /* blocks already reserved */ 120 #define EXT4_MB_HINT_RESERVED 0x0002 121 /* metadata is being allocated */ 122 #define EXT4_MB_HINT_METADATA 0x0004 123 /* first blocks in the file */ 124 #define EXT4_MB_HINT_FIRST 0x0008 125 /* search for the best chunk */ 126 #define EXT4_MB_HINT_BEST 0x0010 127 /* data is being allocated */ 128 #define EXT4_MB_HINT_DATA 0x0020 129 /* don't preallocate (for tails) */ 130 #define EXT4_MB_HINT_NOPREALLOC 0x0040 131 /* allocate for locality group */ 132 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 133 /* allocate goal blocks or none */ 134 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 135 /* goal is meaningful */ 136 #define EXT4_MB_HINT_TRY_GOAL 0x0200 137 /* blocks already pre-reserved by delayed allocation */ 138 #define EXT4_MB_DELALLOC_RESERVED 0x0400 139 /* We are doing stream allocation */ 140 #define EXT4_MB_STREAM_ALLOC 0x0800 141 /* Use reserved root blocks if needed */ 142 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 143 /* Use blocks from reserved pool */ 144 #define EXT4_MB_USE_RESERVED 0x2000 145 146 struct ext4_allocation_request { 147 /* target inode for block we're allocating */ 148 struct inode *inode; 149 /* how many blocks we want to allocate */ 150 unsigned int len; 151 /* logical block in target inode */ 152 ext4_lblk_t logical; 153 /* the closest logical allocated block to the left */ 154 ext4_lblk_t lleft; 155 /* the closest logical allocated block to the right */ 156 ext4_lblk_t lright; 157 /* phys. target (a hint) */ 158 ext4_fsblk_t goal; 159 /* phys. block for the closest logical allocated block to the left */ 160 ext4_fsblk_t pleft; 161 /* phys. block for the closest logical allocated block to the right */ 162 ext4_fsblk_t pright; 163 /* flags. see above EXT4_MB_HINT_* */ 164 unsigned int flags; 165 }; 166 167 /* 168 * Logical to physical block mapping, used by ext4_map_blocks() 169 * 170 * This structure is used to pass requests into ext4_map_blocks() as 171 * well as to store the information returned by ext4_map_blocks(). It 172 * takes less room on the stack than a struct buffer_head. 173 */ 174 #define EXT4_MAP_NEW (1 << BH_New) 175 #define EXT4_MAP_MAPPED (1 << BH_Mapped) 176 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 177 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 178 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 179 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 180 181 struct ext4_map_blocks { 182 ext4_fsblk_t m_pblk; 183 ext4_lblk_t m_lblk; 184 unsigned int m_len; 185 unsigned int m_flags; 186 }; 187 188 /* 189 * Block validity checking, system zone rbtree. 190 */ 191 struct ext4_system_blocks { 192 struct rb_root root; 193 struct rcu_head rcu; 194 }; 195 196 /* 197 * Flags for ext4_io_end->flags 198 */ 199 #define EXT4_IO_END_UNWRITTEN 0x0001 200 201 struct ext4_io_end_vec { 202 struct list_head list; /* list of io_end_vec */ 203 loff_t offset; /* offset in the file */ 204 ssize_t size; /* size of the extent */ 205 }; 206 207 /* 208 * For converting unwritten extents on a work queue. 'handle' is used for 209 * buffered writeback. 210 */ 211 typedef struct ext4_io_end { 212 struct list_head list; /* per-file finished IO list */ 213 handle_t *handle; /* handle reserved for extent 214 * conversion */ 215 struct inode *inode; /* file being written to */ 216 struct bio *bio; /* Linked list of completed 217 * bios covering the extent */ 218 unsigned int flag; /* unwritten or not */ 219 atomic_t count; /* reference counter */ 220 struct list_head list_vec; /* list of ext4_io_end_vec */ 221 } ext4_io_end_t; 222 223 struct ext4_io_submit { 224 struct writeback_control *io_wbc; 225 struct bio *io_bio; 226 ext4_io_end_t *io_end; 227 sector_t io_next_block; 228 }; 229 230 /* 231 * Special inodes numbers 232 */ 233 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 234 #define EXT4_ROOT_INO 2 /* Root inode */ 235 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 236 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 237 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 238 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 239 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 240 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 241 242 /* First non-reserved inode for old ext4 filesystems */ 243 #define EXT4_GOOD_OLD_FIRST_INO 11 244 245 /* 246 * Maximal count of links to a file 247 */ 248 #define EXT4_LINK_MAX 65000 249 250 /* 251 * Macro-instructions used to manage several block sizes 252 */ 253 #define EXT4_MIN_BLOCK_SIZE 1024 254 #define EXT4_MAX_BLOCK_SIZE 65536 255 #define EXT4_MIN_BLOCK_LOG_SIZE 10 256 #define EXT4_MAX_BLOCK_LOG_SIZE 16 257 #define EXT4_MAX_CLUSTER_LOG_SIZE 30 258 #ifdef __KERNEL__ 259 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 260 #else 261 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 262 #endif 263 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 264 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 265 EXT4_SB(s)->s_cluster_bits) 266 #ifdef __KERNEL__ 267 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 268 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 269 #else 270 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 271 #endif 272 #ifdef __KERNEL__ 273 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 274 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 275 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 276 #else 277 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 278 EXT4_GOOD_OLD_INODE_SIZE : \ 279 (s)->s_inode_size) 280 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 281 EXT4_GOOD_OLD_FIRST_INO : \ 282 (s)->s_first_ino) 283 #endif 284 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 285 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \ 286 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \ 287 blkbits)) 288 289 /* Translate a block number to a cluster number */ 290 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 291 /* Translate a cluster number to a block number */ 292 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 293 /* Translate # of blks to # of clusters */ 294 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 295 (sbi)->s_cluster_bits) 296 /* Mask out the low bits to get the starting block of the cluster */ 297 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 298 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 299 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 300 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 301 /* Fill in the low bits to get the last block of the cluster */ 302 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \ 303 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1)) 304 /* Get the cluster offset */ 305 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 306 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 307 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 308 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 309 310 /* 311 * Structure of a blocks group descriptor 312 */ 313 struct ext4_group_desc 314 { 315 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 316 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 317 __le32 bg_inode_table_lo; /* Inodes table block */ 318 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 319 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 320 __le16 bg_used_dirs_count_lo; /* Directories count */ 321 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 322 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 323 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 324 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 325 __le16 bg_itable_unused_lo; /* Unused inodes count */ 326 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 327 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 328 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 329 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 330 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 331 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 332 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 333 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 334 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 335 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 336 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 337 __u32 bg_reserved; 338 }; 339 340 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 341 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 342 sizeof(__le16)) 343 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 344 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 345 sizeof(__le16)) 346 347 /* 348 * Structure of a flex block group info 349 */ 350 351 struct flex_groups { 352 atomic64_t free_clusters; 353 atomic_t free_inodes; 354 atomic_t used_dirs; 355 }; 356 357 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 358 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 359 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 360 361 /* 362 * Macro-instructions used to manage group descriptors 363 */ 364 #define EXT4_MIN_DESC_SIZE 32 365 #define EXT4_MIN_DESC_SIZE_64BIT 64 366 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 367 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 368 #ifdef __KERNEL__ 369 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 370 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 371 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 372 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 373 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 374 #else 375 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 376 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 377 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 378 #endif 379 380 /* 381 * Constants relative to the data blocks 382 */ 383 #define EXT4_NDIR_BLOCKS 12 384 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 385 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 386 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 387 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 388 389 /* 390 * Inode flags 391 */ 392 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 393 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 394 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 395 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 396 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 397 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 398 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 399 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 400 /* Reserved for compression usage... */ 401 #define EXT4_DIRTY_FL 0x00000100 402 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 403 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 404 /* nb: was previously EXT2_ECOMPR_FL */ 405 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 406 /* End compression flags --- maybe not all used */ 407 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 408 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 409 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 410 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 411 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 412 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 413 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 414 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 415 #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */ 416 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 417 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 418 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 419 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 420 #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded file */ 421 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 422 423 #define EXT4_FL_USER_VISIBLE 0x705BDFFF /* User visible flags */ 424 #define EXT4_FL_USER_MODIFIABLE 0x604BC0FF /* User modifiable flags */ 425 426 /* Flags we can manipulate with through EXT4_IOC_FSSETXATTR */ 427 #define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \ 428 EXT4_IMMUTABLE_FL | \ 429 EXT4_APPEND_FL | \ 430 EXT4_NODUMP_FL | \ 431 EXT4_NOATIME_FL | \ 432 EXT4_PROJINHERIT_FL) 433 434 /* Flags that should be inherited by new inodes from their parent. */ 435 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 436 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 437 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 438 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 439 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL) 440 441 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 442 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\ 443 EXT4_PROJINHERIT_FL)) 444 445 /* Flags that are appropriate for non-directories/regular files. */ 446 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 447 448 /* The only flags that should be swapped */ 449 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL) 450 451 /* Mask out flags that are inappropriate for the given type of inode. */ 452 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 453 { 454 if (S_ISDIR(mode)) 455 return flags; 456 else if (S_ISREG(mode)) 457 return flags & EXT4_REG_FLMASK; 458 else 459 return flags & EXT4_OTHER_FLMASK; 460 } 461 462 /* 463 * Inode flags used for atomic set/get 464 */ 465 enum { 466 EXT4_INODE_SECRM = 0, /* Secure deletion */ 467 EXT4_INODE_UNRM = 1, /* Undelete */ 468 EXT4_INODE_COMPR = 2, /* Compress file */ 469 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 470 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 471 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 472 EXT4_INODE_NODUMP = 6, /* do not dump file */ 473 EXT4_INODE_NOATIME = 7, /* do not update atime */ 474 /* Reserved for compression usage... */ 475 EXT4_INODE_DIRTY = 8, 476 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 477 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 478 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 479 /* End compression flags --- maybe not all used */ 480 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 481 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 482 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 483 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 484 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 485 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 486 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 487 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 488 EXT4_INODE_VERITY = 20, /* Verity protected inode */ 489 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 490 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 491 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 492 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 493 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 494 }; 495 496 /* 497 * Since it's pretty easy to mix up bit numbers and hex values, we use a 498 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 499 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 500 * any extra space in the compiled kernel image, otherwise, the build will fail. 501 * It's important that these values are the same, since we are using 502 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 503 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 504 * values found in ext2, ext3 and ext4 filesystems, and of course the values 505 * defined in e2fsprogs. 506 * 507 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 508 */ 509 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 510 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 511 512 static inline void ext4_check_flag_values(void) 513 { 514 CHECK_FLAG_VALUE(SECRM); 515 CHECK_FLAG_VALUE(UNRM); 516 CHECK_FLAG_VALUE(COMPR); 517 CHECK_FLAG_VALUE(SYNC); 518 CHECK_FLAG_VALUE(IMMUTABLE); 519 CHECK_FLAG_VALUE(APPEND); 520 CHECK_FLAG_VALUE(NODUMP); 521 CHECK_FLAG_VALUE(NOATIME); 522 CHECK_FLAG_VALUE(DIRTY); 523 CHECK_FLAG_VALUE(COMPRBLK); 524 CHECK_FLAG_VALUE(NOCOMPR); 525 CHECK_FLAG_VALUE(ENCRYPT); 526 CHECK_FLAG_VALUE(INDEX); 527 CHECK_FLAG_VALUE(IMAGIC); 528 CHECK_FLAG_VALUE(JOURNAL_DATA); 529 CHECK_FLAG_VALUE(NOTAIL); 530 CHECK_FLAG_VALUE(DIRSYNC); 531 CHECK_FLAG_VALUE(TOPDIR); 532 CHECK_FLAG_VALUE(HUGE_FILE); 533 CHECK_FLAG_VALUE(EXTENTS); 534 CHECK_FLAG_VALUE(VERITY); 535 CHECK_FLAG_VALUE(EA_INODE); 536 CHECK_FLAG_VALUE(EOFBLOCKS); 537 CHECK_FLAG_VALUE(INLINE_DATA); 538 CHECK_FLAG_VALUE(PROJINHERIT); 539 CHECK_FLAG_VALUE(RESERVED); 540 } 541 542 /* Used to pass group descriptor data when online resize is done */ 543 struct ext4_new_group_input { 544 __u32 group; /* Group number for this data */ 545 __u64 block_bitmap; /* Absolute block number of block bitmap */ 546 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 547 __u64 inode_table; /* Absolute block number of inode table start */ 548 __u32 blocks_count; /* Total number of blocks in this group */ 549 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 550 __u16 unused; 551 }; 552 553 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 554 struct compat_ext4_new_group_input { 555 u32 group; 556 compat_u64 block_bitmap; 557 compat_u64 inode_bitmap; 558 compat_u64 inode_table; 559 u32 blocks_count; 560 u16 reserved_blocks; 561 u16 unused; 562 }; 563 #endif 564 565 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 566 struct ext4_new_group_data { 567 __u32 group; 568 __u64 block_bitmap; 569 __u64 inode_bitmap; 570 __u64 inode_table; 571 __u32 blocks_count; 572 __u16 reserved_blocks; 573 __u16 mdata_blocks; 574 __u32 free_clusters_count; 575 }; 576 577 /* Indexes used to index group tables in ext4_new_group_data */ 578 enum { 579 BLOCK_BITMAP = 0, /* block bitmap */ 580 INODE_BITMAP, /* inode bitmap */ 581 INODE_TABLE, /* inode tables */ 582 GROUP_TABLE_COUNT, 583 }; 584 585 /* 586 * Flags used by ext4_map_blocks() 587 */ 588 /* Allocate any needed blocks and/or convert an unwritten 589 extent to be an initialized ext4 */ 590 #define EXT4_GET_BLOCKS_CREATE 0x0001 591 /* Request the creation of an unwritten extent */ 592 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 593 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 594 EXT4_GET_BLOCKS_CREATE) 595 /* Caller is from the delayed allocation writeout path 596 * finally doing the actual allocation of delayed blocks */ 597 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 598 /* caller is from the direct IO path, request to creation of an 599 unwritten extents if not allocated, split the unwritten 600 extent if blocks has been preallocated already*/ 601 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 602 #define EXT4_GET_BLOCKS_CONVERT 0x0010 603 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 604 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 605 /* Convert extent to initialized after IO complete */ 606 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 607 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 608 /* Eventual metadata allocation (due to growing extent tree) 609 * should not fail, so try to use reserved blocks for that.*/ 610 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 611 /* Don't normalize allocation size (used for fallocate) */ 612 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 613 /* Request will not result in inode size update (user for fallocate) */ 614 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 615 /* Convert written extents to unwritten */ 616 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 617 /* Write zeros to newly created written extents */ 618 #define EXT4_GET_BLOCKS_ZERO 0x0200 619 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 620 EXT4_GET_BLOCKS_ZERO) 621 /* Caller will submit data before dropping transaction handle. This 622 * allows jbd2 to avoid submitting data before commit. */ 623 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 624 625 /* 626 * The bit position of these flags must not overlap with any of the 627 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 628 * read_extent_tree_block(), ext4_split_extent_at(), 629 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 630 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 631 * caching the extents when reading from the extent tree while a 632 * truncate or punch hole operation is in progress. 633 */ 634 #define EXT4_EX_NOCACHE 0x40000000 635 #define EXT4_EX_FORCE_CACHE 0x20000000 636 637 /* 638 * Flags used by ext4_free_blocks 639 */ 640 #define EXT4_FREE_BLOCKS_METADATA 0x0001 641 #define EXT4_FREE_BLOCKS_FORGET 0x0002 642 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 643 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 644 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 645 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 646 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040 647 648 /* 649 * ioctl commands 650 */ 651 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 652 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 653 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 654 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 655 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 656 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 657 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 658 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 659 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 660 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 661 #define EXT4_IOC_MIGRATE _IO('f', 9) 662 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 663 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 664 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 665 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 666 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 667 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 668 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 669 #define EXT4_IOC_SET_ENCRYPTION_POLICY FS_IOC_SET_ENCRYPTION_POLICY 670 #define EXT4_IOC_GET_ENCRYPTION_PWSALT FS_IOC_GET_ENCRYPTION_PWSALT 671 #define EXT4_IOC_GET_ENCRYPTION_POLICY FS_IOC_GET_ENCRYPTION_POLICY 672 /* ioctl codes 19--39 are reserved for fscrypt */ 673 #define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40) 674 #define EXT4_IOC_GETSTATE _IOW('f', 41, __u32) 675 #define EXT4_IOC_GET_ES_CACHE _IOWR('f', 42, struct fiemap) 676 677 #define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR 678 #define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR 679 680 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32) 681 682 /* 683 * Flags for going down operation 684 */ 685 #define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */ 686 #define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */ 687 #define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */ 688 689 /* 690 * Flags returned by EXT4_IOC_GETSTATE 691 * 692 * We only expose to userspace a subset of the state flags in 693 * i_state_flags 694 */ 695 #define EXT4_STATE_FLAG_EXT_PRECACHED 0x00000001 696 #define EXT4_STATE_FLAG_NEW 0x00000002 697 #define EXT4_STATE_FLAG_NEWENTRY 0x00000004 698 #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE 0x00000008 699 700 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 701 /* 702 * ioctl commands in 32 bit emulation 703 */ 704 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 705 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 706 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 707 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 708 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 709 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 710 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 711 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 712 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 713 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 714 #endif 715 716 /* 717 * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag. 718 * It indicates that the entry in extent status cache is for a hole. 719 */ 720 #define EXT4_FIEMAP_EXTENT_HOLE 0x08000000 721 722 /* Max physical block we can address w/o extents */ 723 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 724 725 /* Max logical block we can support */ 726 #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFF 727 728 /* 729 * Structure of an inode on the disk 730 */ 731 struct ext4_inode { 732 __le16 i_mode; /* File mode */ 733 __le16 i_uid; /* Low 16 bits of Owner Uid */ 734 __le32 i_size_lo; /* Size in bytes */ 735 __le32 i_atime; /* Access time */ 736 __le32 i_ctime; /* Inode Change time */ 737 __le32 i_mtime; /* Modification time */ 738 __le32 i_dtime; /* Deletion Time */ 739 __le16 i_gid; /* Low 16 bits of Group Id */ 740 __le16 i_links_count; /* Links count */ 741 __le32 i_blocks_lo; /* Blocks count */ 742 __le32 i_flags; /* File flags */ 743 union { 744 struct { 745 __le32 l_i_version; 746 } linux1; 747 struct { 748 __u32 h_i_translator; 749 } hurd1; 750 struct { 751 __u32 m_i_reserved1; 752 } masix1; 753 } osd1; /* OS dependent 1 */ 754 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 755 __le32 i_generation; /* File version (for NFS) */ 756 __le32 i_file_acl_lo; /* File ACL */ 757 __le32 i_size_high; 758 __le32 i_obso_faddr; /* Obsoleted fragment address */ 759 union { 760 struct { 761 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 762 __le16 l_i_file_acl_high; 763 __le16 l_i_uid_high; /* these 2 fields */ 764 __le16 l_i_gid_high; /* were reserved2[0] */ 765 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 766 __le16 l_i_reserved; 767 } linux2; 768 struct { 769 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 770 __u16 h_i_mode_high; 771 __u16 h_i_uid_high; 772 __u16 h_i_gid_high; 773 __u32 h_i_author; 774 } hurd2; 775 struct { 776 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 777 __le16 m_i_file_acl_high; 778 __u32 m_i_reserved2[2]; 779 } masix2; 780 } osd2; /* OS dependent 2 */ 781 __le16 i_extra_isize; 782 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 783 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 784 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 785 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 786 __le32 i_crtime; /* File Creation time */ 787 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 788 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 789 __le32 i_projid; /* Project ID */ 790 }; 791 792 struct move_extent { 793 __u32 reserved; /* should be zero */ 794 __u32 donor_fd; /* donor file descriptor */ 795 __u64 orig_start; /* logical start offset in block for orig */ 796 __u64 donor_start; /* logical start offset in block for donor */ 797 __u64 len; /* block length to be moved */ 798 __u64 moved_len; /* moved block length */ 799 }; 800 801 #define EXT4_EPOCH_BITS 2 802 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 803 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 804 805 /* 806 * Extended fields will fit into an inode if the filesystem was formatted 807 * with large inodes (-I 256 or larger) and there are not currently any EAs 808 * consuming all of the available space. For new inodes we always reserve 809 * enough space for the kernel's known extended fields, but for inodes 810 * created with an old kernel this might not have been the case. None of 811 * the extended inode fields is critical for correct filesystem operation. 812 * This macro checks if a certain field fits in the inode. Note that 813 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 814 */ 815 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 816 ((offsetof(typeof(*ext4_inode), field) + \ 817 sizeof((ext4_inode)->field)) \ 818 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 819 (einode)->i_extra_isize)) \ 820 821 /* 822 * We use an encoding that preserves the times for extra epoch "00": 823 * 824 * extra msb of adjust for signed 825 * epoch 32-bit 32-bit tv_sec to 826 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 827 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 828 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 829 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 830 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 831 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 832 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 833 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 834 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 835 * 836 * Note that previous versions of the kernel on 64-bit systems would 837 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 838 * 1970. e2fsck will correct this, assuming that it is run on the 839 * affected filesystem before 2242. 840 */ 841 842 static inline __le32 ext4_encode_extra_time(struct timespec64 *time) 843 { 844 u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK; 845 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); 846 } 847 848 static inline void ext4_decode_extra_time(struct timespec64 *time, 849 __le32 extra) 850 { 851 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) 852 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 853 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 854 } 855 856 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 857 do { \ 858 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\ 859 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 860 (raw_inode)->xtime ## _extra = \ 861 ext4_encode_extra_time(&(inode)->xtime); \ 862 } \ 863 else \ 864 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX)); \ 865 } while (0) 866 867 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 868 do { \ 869 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 870 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 871 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 872 (raw_inode)->xtime ## _extra = \ 873 ext4_encode_extra_time(&(einode)->xtime); \ 874 } while (0) 875 876 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 877 do { \ 878 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 879 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \ 880 ext4_decode_extra_time(&(inode)->xtime, \ 881 raw_inode->xtime ## _extra); \ 882 } \ 883 else \ 884 (inode)->xtime.tv_nsec = 0; \ 885 } while (0) 886 887 888 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 889 do { \ 890 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 891 (einode)->xtime.tv_sec = \ 892 (signed)le32_to_cpu((raw_inode)->xtime); \ 893 else \ 894 (einode)->xtime.tv_sec = 0; \ 895 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 896 ext4_decode_extra_time(&(einode)->xtime, \ 897 raw_inode->xtime ## _extra); \ 898 else \ 899 (einode)->xtime.tv_nsec = 0; \ 900 } while (0) 901 902 #define i_disk_version osd1.linux1.l_i_version 903 904 #if defined(__KERNEL__) || defined(__linux__) 905 #define i_reserved1 osd1.linux1.l_i_reserved1 906 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 907 #define i_blocks_high osd2.linux2.l_i_blocks_high 908 #define i_uid_low i_uid 909 #define i_gid_low i_gid 910 #define i_uid_high osd2.linux2.l_i_uid_high 911 #define i_gid_high osd2.linux2.l_i_gid_high 912 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 913 914 #elif defined(__GNU__) 915 916 #define i_translator osd1.hurd1.h_i_translator 917 #define i_uid_high osd2.hurd2.h_i_uid_high 918 #define i_gid_high osd2.hurd2.h_i_gid_high 919 #define i_author osd2.hurd2.h_i_author 920 921 #elif defined(__masix__) 922 923 #define i_reserved1 osd1.masix1.m_i_reserved1 924 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 925 #define i_reserved2 osd2.masix2.m_i_reserved2 926 927 #endif /* defined(__KERNEL__) || defined(__linux__) */ 928 929 #include "extents_status.h" 930 931 /* 932 * Lock subclasses for i_data_sem in the ext4_inode_info structure. 933 * 934 * These are needed to avoid lockdep false positives when we need to 935 * allocate blocks to the quota inode during ext4_map_blocks(), while 936 * holding i_data_sem for a normal (non-quota) inode. Since we don't 937 * do quota tracking for the quota inode, this avoids deadlock (as 938 * well as infinite recursion, since it isn't turtles all the way 939 * down...) 940 * 941 * I_DATA_SEM_NORMAL - Used for most inodes 942 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode 943 * where the second inode has larger inode number 944 * than the first 945 * I_DATA_SEM_QUOTA - Used for quota inodes only 946 */ 947 enum { 948 I_DATA_SEM_NORMAL = 0, 949 I_DATA_SEM_OTHER, 950 I_DATA_SEM_QUOTA, 951 }; 952 953 954 /* 955 * fourth extended file system inode data in memory 956 */ 957 struct ext4_inode_info { 958 __le32 i_data[15]; /* unconverted */ 959 __u32 i_dtime; 960 ext4_fsblk_t i_file_acl; 961 962 /* 963 * i_block_group is the number of the block group which contains 964 * this file's inode. Constant across the lifetime of the inode, 965 * it is used for making block allocation decisions - we try to 966 * place a file's data blocks near its inode block, and new inodes 967 * near to their parent directory's inode. 968 */ 969 ext4_group_t i_block_group; 970 ext4_lblk_t i_dir_start_lookup; 971 #if (BITS_PER_LONG < 64) 972 unsigned long i_state_flags; /* Dynamic state flags */ 973 #endif 974 unsigned long i_flags; 975 976 /* 977 * Extended attributes can be read independently of the main file 978 * data. Taking i_mutex even when reading would cause contention 979 * between readers of EAs and writers of regular file data, so 980 * instead we synchronize on xattr_sem when reading or changing 981 * EAs. 982 */ 983 struct rw_semaphore xattr_sem; 984 985 struct list_head i_orphan; /* unlinked but open inodes */ 986 987 /* 988 * i_disksize keeps track of what the inode size is ON DISK, not 989 * in memory. During truncate, i_size is set to the new size by 990 * the VFS prior to calling ext4_truncate(), but the filesystem won't 991 * set i_disksize to 0 until the truncate is actually under way. 992 * 993 * The intent is that i_disksize always represents the blocks which 994 * are used by this file. This allows recovery to restart truncate 995 * on orphans if we crash during truncate. We actually write i_disksize 996 * into the on-disk inode when writing inodes out, instead of i_size. 997 * 998 * The only time when i_disksize and i_size may be different is when 999 * a truncate is in progress. The only things which change i_disksize 1000 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 1001 */ 1002 loff_t i_disksize; 1003 1004 /* 1005 * i_data_sem is for serialising ext4_truncate() against 1006 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 1007 * data tree are chopped off during truncate. We can't do that in 1008 * ext4 because whenever we perform intermediate commits during 1009 * truncate, the inode and all the metadata blocks *must* be in a 1010 * consistent state which allows truncation of the orphans to restart 1011 * during recovery. Hence we must fix the get_block-vs-truncate race 1012 * by other means, so we have i_data_sem. 1013 */ 1014 struct rw_semaphore i_data_sem; 1015 /* 1016 * i_mmap_sem is for serializing page faults with truncate / punch hole 1017 * operations. We have to make sure that new page cannot be faulted in 1018 * a section of the inode that is being punched. We cannot easily use 1019 * i_data_sem for this since we need protection for the whole punch 1020 * operation and i_data_sem ranks below transaction start so we have 1021 * to occasionally drop it. 1022 */ 1023 struct rw_semaphore i_mmap_sem; 1024 struct inode vfs_inode; 1025 struct jbd2_inode *jinode; 1026 1027 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 1028 1029 /* 1030 * File creation time. Its function is same as that of 1031 * struct timespec64 i_{a,c,m}time in the generic inode. 1032 */ 1033 struct timespec64 i_crtime; 1034 1035 /* mballoc */ 1036 struct list_head i_prealloc_list; 1037 spinlock_t i_prealloc_lock; 1038 1039 /* extents status tree */ 1040 struct ext4_es_tree i_es_tree; 1041 rwlock_t i_es_lock; 1042 struct list_head i_es_list; 1043 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1044 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1045 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1046 extents to shrink. Protected by 1047 i_es_lock */ 1048 1049 /* ialloc */ 1050 ext4_group_t i_last_alloc_group; 1051 1052 /* allocation reservation info for delalloc */ 1053 /* In case of bigalloc, this refer to clusters rather than blocks */ 1054 unsigned int i_reserved_data_blocks; 1055 ext4_lblk_t i_da_metadata_calc_last_lblock; 1056 int i_da_metadata_calc_len; 1057 1058 /* pending cluster reservations for bigalloc file systems */ 1059 struct ext4_pending_tree i_pending_tree; 1060 1061 /* on-disk additional length */ 1062 __u16 i_extra_isize; 1063 1064 /* Indicate the inline data space. */ 1065 u16 i_inline_off; 1066 u16 i_inline_size; 1067 1068 #ifdef CONFIG_QUOTA 1069 /* quota space reservation, managed internally by quota code */ 1070 qsize_t i_reserved_quota; 1071 #endif 1072 1073 /* Lock protecting lists below */ 1074 spinlock_t i_completed_io_lock; 1075 /* 1076 * Completed IOs that need unwritten extents handling and have 1077 * transaction reserved 1078 */ 1079 struct list_head i_rsv_conversion_list; 1080 struct work_struct i_rsv_conversion_work; 1081 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 1082 1083 spinlock_t i_block_reservation_lock; 1084 1085 /* 1086 * Transactions that contain inode's metadata needed to complete 1087 * fsync and fdatasync, respectively. 1088 */ 1089 tid_t i_sync_tid; 1090 tid_t i_datasync_tid; 1091 1092 #ifdef CONFIG_QUOTA 1093 struct dquot *i_dquot[MAXQUOTAS]; 1094 #endif 1095 1096 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1097 __u32 i_csum_seed; 1098 1099 kprojid_t i_projid; 1100 }; 1101 1102 /* 1103 * File system states 1104 */ 1105 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1106 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1107 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1108 1109 /* 1110 * Misc. filesystem flags 1111 */ 1112 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1113 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1114 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1115 1116 /* 1117 * Mount flags set via mount options or defaults 1118 */ 1119 #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */ 1120 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1121 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1122 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1123 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1124 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1125 #define EXT4_MOUNT_ERRORS_MASK 0x00070 1126 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1127 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1128 #ifdef CONFIG_FS_DAX 1129 #define EXT4_MOUNT_DAX 0x00200 /* Direct Access */ 1130 #else 1131 #define EXT4_MOUNT_DAX 0 1132 #endif 1133 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1134 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1135 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1136 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1137 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1138 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1139 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1140 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1141 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1142 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1143 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */ 1144 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota, 1145 * enable enforcement for hidden 1146 * quota files */ 1147 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable 1148 * enforcement for hidden quota 1149 * files */ 1150 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota 1151 * enforcement */ 1152 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1153 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1154 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1155 #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */ 1156 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1157 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1158 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1159 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1160 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1161 1162 /* 1163 * Mount flags set either automatically (could not be set by mount option) 1164 * based on per file system feature or property or in special cases such as 1165 * distinguishing between explicit mount option definition and default. 1166 */ 1167 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1168 specified delalloc */ 1169 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1170 size of blocksize * 8 1171 blocks */ 1172 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1173 file systems */ 1174 1175 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1176 specified journal checksum */ 1177 1178 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1179 ~EXT4_MOUNT_##opt 1180 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1181 EXT4_MOUNT_##opt 1182 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1183 EXT4_MOUNT_##opt) 1184 1185 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1186 ~EXT4_MOUNT2_##opt 1187 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1188 EXT4_MOUNT2_##opt 1189 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1190 EXT4_MOUNT2_##opt) 1191 1192 #define ext4_test_and_set_bit __test_and_set_bit_le 1193 #define ext4_set_bit __set_bit_le 1194 #define ext4_set_bit_atomic ext2_set_bit_atomic 1195 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1196 #define ext4_clear_bit __clear_bit_le 1197 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1198 #define ext4_test_bit test_bit_le 1199 #define ext4_find_next_zero_bit find_next_zero_bit_le 1200 #define ext4_find_next_bit find_next_bit_le 1201 1202 extern void ext4_set_bits(void *bm, int cur, int len); 1203 1204 /* 1205 * Maximal mount counts between two filesystem checks 1206 */ 1207 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1208 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1209 1210 /* 1211 * Behaviour when detecting errors 1212 */ 1213 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1214 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1215 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1216 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1217 1218 /* Metadata checksum algorithm codes */ 1219 #define EXT4_CRC32C_CHKSUM 1 1220 1221 /* 1222 * Structure of the super block 1223 */ 1224 struct ext4_super_block { 1225 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1226 __le32 s_blocks_count_lo; /* Blocks count */ 1227 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1228 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1229 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1230 __le32 s_first_data_block; /* First Data Block */ 1231 __le32 s_log_block_size; /* Block size */ 1232 __le32 s_log_cluster_size; /* Allocation cluster size */ 1233 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1234 __le32 s_clusters_per_group; /* # Clusters per group */ 1235 __le32 s_inodes_per_group; /* # Inodes per group */ 1236 __le32 s_mtime; /* Mount time */ 1237 /*30*/ __le32 s_wtime; /* Write time */ 1238 __le16 s_mnt_count; /* Mount count */ 1239 __le16 s_max_mnt_count; /* Maximal mount count */ 1240 __le16 s_magic; /* Magic signature */ 1241 __le16 s_state; /* File system state */ 1242 __le16 s_errors; /* Behaviour when detecting errors */ 1243 __le16 s_minor_rev_level; /* minor revision level */ 1244 /*40*/ __le32 s_lastcheck; /* time of last check */ 1245 __le32 s_checkinterval; /* max. time between checks */ 1246 __le32 s_creator_os; /* OS */ 1247 __le32 s_rev_level; /* Revision level */ 1248 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1249 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1250 /* 1251 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1252 * 1253 * Note: the difference between the compatible feature set and 1254 * the incompatible feature set is that if there is a bit set 1255 * in the incompatible feature set that the kernel doesn't 1256 * know about, it should refuse to mount the filesystem. 1257 * 1258 * e2fsck's requirements are more strict; if it doesn't know 1259 * about a feature in either the compatible or incompatible 1260 * feature set, it must abort and not try to meddle with 1261 * things it doesn't understand... 1262 */ 1263 __le32 s_first_ino; /* First non-reserved inode */ 1264 __le16 s_inode_size; /* size of inode structure */ 1265 __le16 s_block_group_nr; /* block group # of this superblock */ 1266 __le32 s_feature_compat; /* compatible feature set */ 1267 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1268 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1269 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1270 /*78*/ char s_volume_name[16]; /* volume name */ 1271 /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */ 1272 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1273 /* 1274 * Performance hints. Directory preallocation should only 1275 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1276 */ 1277 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1278 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1279 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1280 /* 1281 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1282 */ 1283 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1284 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1285 __le32 s_journal_dev; /* device number of journal file */ 1286 __le32 s_last_orphan; /* start of list of inodes to delete */ 1287 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1288 __u8 s_def_hash_version; /* Default hash version to use */ 1289 __u8 s_jnl_backup_type; 1290 __le16 s_desc_size; /* size of group descriptor */ 1291 /*100*/ __le32 s_default_mount_opts; 1292 __le32 s_first_meta_bg; /* First metablock block group */ 1293 __le32 s_mkfs_time; /* When the filesystem was created */ 1294 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1295 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1296 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1297 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1298 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1299 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1300 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1301 __le32 s_flags; /* Miscellaneous flags */ 1302 __le16 s_raid_stride; /* RAID stride */ 1303 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1304 __le64 s_mmp_block; /* Block for multi-mount protection */ 1305 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1306 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1307 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1308 __u8 s_encryption_level; /* versioning level for encryption */ 1309 __u8 s_reserved_pad; /* Padding to next 32bits */ 1310 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1311 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1312 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1313 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1314 snapshot's future use */ 1315 __le32 s_snapshot_list; /* inode number of the head of the 1316 on-disk snapshot list */ 1317 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1318 __le32 s_error_count; /* number of fs errors */ 1319 __le32 s_first_error_time; /* first time an error happened */ 1320 __le32 s_first_error_ino; /* inode involved in first error */ 1321 __le64 s_first_error_block; /* block involved of first error */ 1322 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */ 1323 __le32 s_first_error_line; /* line number where error happened */ 1324 __le32 s_last_error_time; /* most recent time of an error */ 1325 __le32 s_last_error_ino; /* inode involved in last error */ 1326 __le32 s_last_error_line; /* line number where error happened */ 1327 __le64 s_last_error_block; /* block involved of last error */ 1328 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */ 1329 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1330 __u8 s_mount_opts[64]; 1331 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1332 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1333 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1334 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1335 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1336 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1337 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1338 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1339 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1340 __u8 s_wtime_hi; 1341 __u8 s_mtime_hi; 1342 __u8 s_mkfs_time_hi; 1343 __u8 s_lastcheck_hi; 1344 __u8 s_first_error_time_hi; 1345 __u8 s_last_error_time_hi; 1346 __u8 s_first_error_errcode; 1347 __u8 s_last_error_errcode; 1348 __le16 s_encoding; /* Filename charset encoding */ 1349 __le16 s_encoding_flags; /* Filename charset encoding flags */ 1350 __le32 s_reserved[95]; /* Padding to the end of the block */ 1351 __le32 s_checksum; /* crc32c(superblock) */ 1352 }; 1353 1354 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1355 1356 #ifdef __KERNEL__ 1357 1358 /* 1359 * run-time mount flags 1360 */ 1361 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1362 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1363 #define EXT4_MF_TEST_DUMMY_ENCRYPTION 0x0004 1364 1365 #ifdef CONFIG_FS_ENCRYPTION 1366 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \ 1367 EXT4_MF_TEST_DUMMY_ENCRYPTION)) 1368 #else 1369 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0) 1370 #endif 1371 1372 /* Number of quota types we support */ 1373 #define EXT4_MAXQUOTAS 3 1374 1375 #define EXT4_ENC_UTF8_12_1 1 1376 1377 /* 1378 * Flags for ext4_sb_info.s_encoding_flags. 1379 */ 1380 #define EXT4_ENC_STRICT_MODE_FL (1 << 0) 1381 1382 #define ext4_has_strict_mode(sbi) \ 1383 (sbi->s_encoding_flags & EXT4_ENC_STRICT_MODE_FL) 1384 1385 /* 1386 * fourth extended-fs super-block data in memory 1387 */ 1388 struct ext4_sb_info { 1389 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1390 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1391 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1392 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1393 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1394 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1395 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1396 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1397 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1398 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1399 unsigned long s_overhead; /* # of fs overhead clusters */ 1400 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1401 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1402 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1403 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1404 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1405 struct buffer_head **s_group_desc; 1406 unsigned int s_mount_opt; 1407 unsigned int s_mount_opt2; 1408 unsigned int s_mount_flags; 1409 unsigned int s_def_mount_opt; 1410 ext4_fsblk_t s_sb_block; 1411 atomic64_t s_resv_clusters; 1412 kuid_t s_resuid; 1413 kgid_t s_resgid; 1414 unsigned short s_mount_state; 1415 unsigned short s_pad; 1416 int s_addr_per_block_bits; 1417 int s_desc_per_block_bits; 1418 int s_inode_size; 1419 int s_first_ino; 1420 unsigned int s_inode_readahead_blks; 1421 unsigned int s_inode_goal; 1422 u32 s_hash_seed[4]; 1423 int s_def_hash_version; 1424 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1425 struct percpu_counter s_freeclusters_counter; 1426 struct percpu_counter s_freeinodes_counter; 1427 struct percpu_counter s_dirs_counter; 1428 struct percpu_counter s_dirtyclusters_counter; 1429 struct blockgroup_lock *s_blockgroup_lock; 1430 struct proc_dir_entry *s_proc; 1431 struct kobject s_kobj; 1432 struct completion s_kobj_unregister; 1433 struct super_block *s_sb; 1434 #ifdef CONFIG_UNICODE 1435 struct unicode_map *s_encoding; 1436 __u16 s_encoding_flags; 1437 #endif 1438 1439 /* Journaling */ 1440 struct journal_s *s_journal; 1441 struct list_head s_orphan; 1442 struct mutex s_orphan_lock; 1443 unsigned long s_ext4_flags; /* Ext4 superblock flags */ 1444 unsigned long s_commit_interval; 1445 u32 s_max_batch_time; 1446 u32 s_min_batch_time; 1447 struct block_device *journal_bdev; 1448 #ifdef CONFIG_QUOTA 1449 /* Names of quota files with journalled quota */ 1450 char __rcu *s_qf_names[EXT4_MAXQUOTAS]; 1451 int s_jquota_fmt; /* Format of quota to use */ 1452 #endif 1453 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1454 struct ext4_system_blocks __rcu *system_blks; 1455 1456 #ifdef EXTENTS_STATS 1457 /* ext4 extents stats */ 1458 unsigned long s_ext_min; 1459 unsigned long s_ext_max; 1460 unsigned long s_depth_max; 1461 spinlock_t s_ext_stats_lock; 1462 unsigned long s_ext_blocks; 1463 unsigned long s_ext_extents; 1464 #endif 1465 1466 /* for buddy allocator */ 1467 struct ext4_group_info ***s_group_info; 1468 struct inode *s_buddy_cache; 1469 spinlock_t s_md_lock; 1470 unsigned short *s_mb_offsets; 1471 unsigned int *s_mb_maxs; 1472 unsigned int s_group_info_size; 1473 unsigned int s_mb_free_pending; 1474 struct list_head s_freed_data_list; /* List of blocks to be freed 1475 after commit completed */ 1476 1477 /* tunables */ 1478 unsigned long s_stripe; 1479 unsigned int s_mb_stream_request; 1480 unsigned int s_mb_max_to_scan; 1481 unsigned int s_mb_min_to_scan; 1482 unsigned int s_mb_stats; 1483 unsigned int s_mb_order2_reqs; 1484 unsigned int s_mb_group_prealloc; 1485 unsigned int s_max_dir_size_kb; 1486 /* where last allocation was done - for stream allocation */ 1487 unsigned long s_mb_last_group; 1488 unsigned long s_mb_last_start; 1489 1490 /* stats for buddy allocator */ 1491 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1492 atomic_t s_bal_success; /* we found long enough chunks */ 1493 atomic_t s_bal_allocated; /* in blocks */ 1494 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1495 atomic_t s_bal_goals; /* goal hits */ 1496 atomic_t s_bal_breaks; /* too long searches */ 1497 atomic_t s_bal_2orders; /* 2^order hits */ 1498 spinlock_t s_bal_lock; 1499 unsigned long s_mb_buddies_generated; 1500 unsigned long long s_mb_generation_time; 1501 atomic_t s_mb_lost_chunks; 1502 atomic_t s_mb_preallocated; 1503 atomic_t s_mb_discarded; 1504 atomic_t s_lock_busy; 1505 1506 /* locality groups */ 1507 struct ext4_locality_group __percpu *s_locality_groups; 1508 1509 /* for write statistics */ 1510 unsigned long s_sectors_written_start; 1511 u64 s_kbytes_written; 1512 1513 /* the size of zero-out chunk */ 1514 unsigned int s_extent_max_zeroout_kb; 1515 1516 unsigned int s_log_groups_per_flex; 1517 struct flex_groups *s_flex_groups; 1518 ext4_group_t s_flex_groups_allocated; 1519 1520 /* workqueue for reserved extent conversions (buffered io) */ 1521 struct workqueue_struct *rsv_conversion_wq; 1522 1523 /* timer for periodic error stats printing */ 1524 struct timer_list s_err_report; 1525 1526 /* Lazy inode table initialization info */ 1527 struct ext4_li_request *s_li_request; 1528 /* Wait multiplier for lazy initialization thread */ 1529 unsigned int s_li_wait_mult; 1530 1531 /* Kernel thread for multiple mount protection */ 1532 struct task_struct *s_mmp_tsk; 1533 1534 /* record the last minlen when FITRIM is called. */ 1535 atomic_t s_last_trim_minblks; 1536 1537 /* Reference to checksum algorithm driver via cryptoapi */ 1538 struct crypto_shash *s_chksum_driver; 1539 1540 /* Precomputed FS UUID checksum for seeding other checksums */ 1541 __u32 s_csum_seed; 1542 1543 /* Reclaim extents from extent status tree */ 1544 struct shrinker s_es_shrinker; 1545 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1546 long s_es_nr_inode; 1547 struct ext4_es_stats s_es_stats; 1548 struct mb_cache *s_ea_block_cache; 1549 struct mb_cache *s_ea_inode_cache; 1550 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1551 1552 /* Ratelimit ext4 messages. */ 1553 struct ratelimit_state s_err_ratelimit_state; 1554 struct ratelimit_state s_warning_ratelimit_state; 1555 struct ratelimit_state s_msg_ratelimit_state; 1556 1557 /* Barrier between changing inodes' journal flags and writepages ops. */ 1558 struct percpu_rw_semaphore s_journal_flag_rwsem; 1559 struct dax_device *s_daxdev; 1560 #ifdef CONFIG_EXT4_DEBUG 1561 unsigned long s_simulate_fail; 1562 #endif 1563 }; 1564 1565 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1566 { 1567 return sb->s_fs_info; 1568 } 1569 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1570 { 1571 return container_of(inode, struct ext4_inode_info, vfs_inode); 1572 } 1573 1574 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1575 { 1576 return ino == EXT4_ROOT_INO || 1577 (ino >= EXT4_FIRST_INO(sb) && 1578 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1579 } 1580 1581 /* 1582 * Simulate_fail codes 1583 */ 1584 #define EXT4_SIM_BBITMAP_EIO 1 1585 #define EXT4_SIM_BBITMAP_CRC 2 1586 #define EXT4_SIM_IBITMAP_EIO 3 1587 #define EXT4_SIM_IBITMAP_CRC 4 1588 #define EXT4_SIM_INODE_EIO 5 1589 #define EXT4_SIM_INODE_CRC 6 1590 #define EXT4_SIM_DIRBLOCK_EIO 7 1591 #define EXT4_SIM_DIRBLOCK_CRC 8 1592 1593 static inline bool ext4_simulate_fail(struct super_block *sb, 1594 unsigned long code) 1595 { 1596 #ifdef CONFIG_EXT4_DEBUG 1597 struct ext4_sb_info *sbi = EXT4_SB(sb); 1598 1599 if (unlikely(sbi->s_simulate_fail == code)) { 1600 sbi->s_simulate_fail = 0; 1601 return true; 1602 } 1603 #endif 1604 return false; 1605 } 1606 1607 static inline void ext4_simulate_fail_bh(struct super_block *sb, 1608 struct buffer_head *bh, 1609 unsigned long code) 1610 { 1611 if (!IS_ERR(bh) && ext4_simulate_fail(sb, code)) 1612 clear_buffer_uptodate(bh); 1613 } 1614 1615 /* 1616 * Error number codes for s_{first,last}_error_errno 1617 * 1618 * Linux errno numbers are architecture specific, so we need to translate 1619 * them into something which is architecture independent. We don't define 1620 * codes for all errno's; just the ones which are most likely to be the cause 1621 * of an ext4_error() call. 1622 */ 1623 #define EXT4_ERR_UNKNOWN 1 1624 #define EXT4_ERR_EIO 2 1625 #define EXT4_ERR_ENOMEM 3 1626 #define EXT4_ERR_EFSBADCRC 4 1627 #define EXT4_ERR_EFSCORRUPTED 5 1628 #define EXT4_ERR_ENOSPC 6 1629 #define EXT4_ERR_ENOKEY 7 1630 #define EXT4_ERR_EROFS 8 1631 #define EXT4_ERR_EFBIG 9 1632 #define EXT4_ERR_EEXIST 10 1633 #define EXT4_ERR_ERANGE 11 1634 #define EXT4_ERR_EOVERFLOW 12 1635 #define EXT4_ERR_EBUSY 13 1636 #define EXT4_ERR_ENOTDIR 14 1637 #define EXT4_ERR_ENOTEMPTY 15 1638 #define EXT4_ERR_ESHUTDOWN 16 1639 #define EXT4_ERR_EFAULT 17 1640 1641 /* 1642 * Inode dynamic state flags 1643 */ 1644 enum { 1645 EXT4_STATE_JDATA, /* journaled data exists */ 1646 EXT4_STATE_NEW, /* inode is newly created */ 1647 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1648 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1649 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1650 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1651 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1652 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1653 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1654 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */ 1655 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */ 1656 }; 1657 1658 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1659 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1660 { \ 1661 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1662 } \ 1663 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1664 { \ 1665 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1666 } \ 1667 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1668 { \ 1669 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1670 } 1671 1672 /* Add these declarations here only so that these functions can be 1673 * found by name. Otherwise, they are very hard to locate. */ 1674 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1675 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1676 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1677 EXT4_INODE_BIT_FNS(flag, flags, 0) 1678 1679 /* Add these declarations here only so that these functions can be 1680 * found by name. Otherwise, they are very hard to locate. */ 1681 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1682 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1683 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1684 #if (BITS_PER_LONG < 64) 1685 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1686 1687 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1688 { 1689 (ei)->i_state_flags = 0; 1690 } 1691 #else 1692 EXT4_INODE_BIT_FNS(state, flags, 32) 1693 1694 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1695 { 1696 /* We depend on the fact that callers will set i_flags */ 1697 } 1698 #endif 1699 #else 1700 /* Assume that user mode programs are passing in an ext4fs superblock, not 1701 * a kernel struct super_block. This will allow us to call the feature-test 1702 * macros from user land. */ 1703 #define EXT4_SB(sb) (sb) 1704 #endif 1705 1706 static inline bool ext4_verity_in_progress(struct inode *inode) 1707 { 1708 return IS_ENABLED(CONFIG_FS_VERITY) && 1709 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS); 1710 } 1711 1712 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1713 1714 /* 1715 * Codes for operating systems 1716 */ 1717 #define EXT4_OS_LINUX 0 1718 #define EXT4_OS_HURD 1 1719 #define EXT4_OS_MASIX 2 1720 #define EXT4_OS_FREEBSD 3 1721 #define EXT4_OS_LITES 4 1722 1723 /* 1724 * Revision levels 1725 */ 1726 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1727 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1728 1729 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1730 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1731 1732 #define EXT4_GOOD_OLD_INODE_SIZE 128 1733 1734 #define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN) 1735 #define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX 1736 #define EXT4_TIMESTAMP_MIN S32_MIN 1737 1738 /* 1739 * Feature set definitions 1740 */ 1741 1742 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1743 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1744 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1745 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1746 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1747 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1748 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1749 #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800 1750 1751 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1752 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1753 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1754 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1755 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1756 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1757 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1758 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1759 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1760 /* 1761 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1762 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1763 * all other data structures' checksums. However, the METADATA_CSUM and 1764 * GDT_CSUM bits are mutually exclusive. 1765 */ 1766 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1767 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1768 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 1769 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000 1770 1771 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1772 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1773 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1774 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1775 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1776 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1777 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1778 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1779 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1780 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1781 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1782 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 1783 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1784 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1785 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1786 #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000 1787 1788 extern void ext4_update_dynamic_rev(struct super_block *sb); 1789 1790 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 1791 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1792 { \ 1793 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1794 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 1795 } \ 1796 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1797 { \ 1798 ext4_update_dynamic_rev(sb); \ 1799 EXT4_SB(sb)->s_es->s_feature_compat |= \ 1800 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1801 } \ 1802 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1803 { \ 1804 EXT4_SB(sb)->s_es->s_feature_compat &= \ 1805 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1806 } 1807 1808 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 1809 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1810 { \ 1811 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1812 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 1813 } \ 1814 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1815 { \ 1816 ext4_update_dynamic_rev(sb); \ 1817 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 1818 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1819 } \ 1820 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1821 { \ 1822 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 1823 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1824 } 1825 1826 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 1827 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1828 { \ 1829 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1830 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 1831 } \ 1832 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1833 { \ 1834 ext4_update_dynamic_rev(sb); \ 1835 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 1836 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1837 } \ 1838 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1839 { \ 1840 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 1841 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1842 } 1843 1844 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 1845 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 1846 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 1847 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 1848 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 1849 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 1850 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 1851 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES) 1852 1853 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 1854 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 1855 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 1856 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 1857 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 1858 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 1859 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 1860 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 1861 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 1862 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 1863 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 1864 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 1865 EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY) 1866 1867 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 1868 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 1869 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 1870 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 1871 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 1872 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 1873 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 1874 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 1875 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 1876 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 1877 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 1878 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 1879 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 1880 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 1881 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 1882 EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD) 1883 1884 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1885 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1886 EXT4_FEATURE_INCOMPAT_META_BG) 1887 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1888 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1889 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1890 1891 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1892 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1893 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1894 EXT4_FEATURE_INCOMPAT_META_BG) 1895 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1896 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1897 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1898 1899 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1900 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1901 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1902 EXT4_FEATURE_INCOMPAT_META_BG| \ 1903 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1904 EXT4_FEATURE_INCOMPAT_64BIT| \ 1905 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1906 EXT4_FEATURE_INCOMPAT_EA_INODE| \ 1907 EXT4_FEATURE_INCOMPAT_MMP | \ 1908 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 1909 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 1910 EXT4_FEATURE_INCOMPAT_CASEFOLD | \ 1911 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \ 1912 EXT4_FEATURE_INCOMPAT_LARGEDIR) 1913 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1914 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1915 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1916 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1917 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1918 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1919 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1920 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1921 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1922 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 1923 EXT4_FEATURE_RO_COMPAT_PROJECT |\ 1924 EXT4_FEATURE_RO_COMPAT_VERITY) 1925 1926 #define EXTN_FEATURE_FUNCS(ver) \ 1927 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 1928 { \ 1929 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1930 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 1931 } \ 1932 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 1933 { \ 1934 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1935 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 1936 } \ 1937 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 1938 { \ 1939 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1940 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 1941 } 1942 1943 EXTN_FEATURE_FUNCS(2) 1944 EXTN_FEATURE_FUNCS(3) 1945 EXTN_FEATURE_FUNCS(4) 1946 1947 static inline bool ext4_has_compat_features(struct super_block *sb) 1948 { 1949 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 1950 } 1951 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 1952 { 1953 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 1954 } 1955 static inline bool ext4_has_incompat_features(struct super_block *sb) 1956 { 1957 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 1958 } 1959 1960 /* 1961 * Superblock flags 1962 */ 1963 #define EXT4_FLAGS_RESIZING 0 1964 #define EXT4_FLAGS_SHUTDOWN 1 1965 1966 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi) 1967 { 1968 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 1969 } 1970 1971 1972 /* 1973 * Default values for user and/or group using reserved blocks 1974 */ 1975 #define EXT4_DEF_RESUID 0 1976 #define EXT4_DEF_RESGID 0 1977 1978 /* 1979 * Default project ID 1980 */ 1981 #define EXT4_DEF_PROJID 0 1982 1983 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1984 1985 /* 1986 * Default mount options 1987 */ 1988 #define EXT4_DEFM_DEBUG 0x0001 1989 #define EXT4_DEFM_BSDGROUPS 0x0002 1990 #define EXT4_DEFM_XATTR_USER 0x0004 1991 #define EXT4_DEFM_ACL 0x0008 1992 #define EXT4_DEFM_UID16 0x0010 1993 #define EXT4_DEFM_JMODE 0x0060 1994 #define EXT4_DEFM_JMODE_DATA 0x0020 1995 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1996 #define EXT4_DEFM_JMODE_WBACK 0x0060 1997 #define EXT4_DEFM_NOBARRIER 0x0100 1998 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1999 #define EXT4_DEFM_DISCARD 0x0400 2000 #define EXT4_DEFM_NODELALLOC 0x0800 2001 2002 /* 2003 * Default journal batch times 2004 */ 2005 #define EXT4_DEF_MIN_BATCH_TIME 0 2006 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 2007 2008 /* 2009 * Minimum number of groups in a flexgroup before we separate out 2010 * directories into the first block group of a flexgroup 2011 */ 2012 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 2013 2014 /* 2015 * Structure of a directory entry 2016 */ 2017 #define EXT4_NAME_LEN 255 2018 2019 struct ext4_dir_entry { 2020 __le32 inode; /* Inode number */ 2021 __le16 rec_len; /* Directory entry length */ 2022 __le16 name_len; /* Name length */ 2023 char name[EXT4_NAME_LEN]; /* File name */ 2024 }; 2025 2026 /* 2027 * The new version of the directory entry. Since EXT4 structures are 2028 * stored in intel byte order, and the name_len field could never be 2029 * bigger than 255 chars, it's safe to reclaim the extra byte for the 2030 * file_type field. 2031 */ 2032 struct ext4_dir_entry_2 { 2033 __le32 inode; /* Inode number */ 2034 __le16 rec_len; /* Directory entry length */ 2035 __u8 name_len; /* Name length */ 2036 __u8 file_type; 2037 char name[EXT4_NAME_LEN]; /* File name */ 2038 }; 2039 2040 /* 2041 * This is a bogus directory entry at the end of each leaf block that 2042 * records checksums. 2043 */ 2044 struct ext4_dir_entry_tail { 2045 __le32 det_reserved_zero1; /* Pretend to be unused */ 2046 __le16 det_rec_len; /* 12 */ 2047 __u8 det_reserved_zero2; /* Zero name length */ 2048 __u8 det_reserved_ft; /* 0xDE, fake file type */ 2049 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 2050 }; 2051 2052 #define EXT4_DIRENT_TAIL(block, blocksize) \ 2053 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 2054 ((blocksize) - \ 2055 sizeof(struct ext4_dir_entry_tail)))) 2056 2057 /* 2058 * Ext4 directory file types. Only the low 3 bits are used. The 2059 * other bits are reserved for now. 2060 */ 2061 #define EXT4_FT_UNKNOWN 0 2062 #define EXT4_FT_REG_FILE 1 2063 #define EXT4_FT_DIR 2 2064 #define EXT4_FT_CHRDEV 3 2065 #define EXT4_FT_BLKDEV 4 2066 #define EXT4_FT_FIFO 5 2067 #define EXT4_FT_SOCK 6 2068 #define EXT4_FT_SYMLINK 7 2069 2070 #define EXT4_FT_MAX 8 2071 2072 #define EXT4_FT_DIR_CSUM 0xDE 2073 2074 /* 2075 * EXT4_DIR_PAD defines the directory entries boundaries 2076 * 2077 * NOTE: It must be a multiple of 4 2078 */ 2079 #define EXT4_DIR_PAD 4 2080 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 2081 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 2082 ~EXT4_DIR_ROUND) 2083 #define EXT4_MAX_REC_LEN ((1<<16)-1) 2084 2085 /* 2086 * If we ever get support for fs block sizes > page_size, we'll need 2087 * to remove the #if statements in the next two functions... 2088 */ 2089 static inline unsigned int 2090 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 2091 { 2092 unsigned len = le16_to_cpu(dlen); 2093 2094 #if (PAGE_SIZE >= 65536) 2095 if (len == EXT4_MAX_REC_LEN || len == 0) 2096 return blocksize; 2097 return (len & 65532) | ((len & 3) << 16); 2098 #else 2099 return len; 2100 #endif 2101 } 2102 2103 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 2104 { 2105 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 2106 BUG(); 2107 #if (PAGE_SIZE >= 65536) 2108 if (len < 65536) 2109 return cpu_to_le16(len); 2110 if (len == blocksize) { 2111 if (blocksize == 65536) 2112 return cpu_to_le16(EXT4_MAX_REC_LEN); 2113 else 2114 return cpu_to_le16(0); 2115 } 2116 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 2117 #else 2118 return cpu_to_le16(len); 2119 #endif 2120 } 2121 2122 /* 2123 * Hash Tree Directory indexing 2124 * (c) Daniel Phillips, 2001 2125 */ 2126 2127 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2128 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2129 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \ 2130 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir))) 2131 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2132 2133 /* Legal values for the dx_root hash_version field: */ 2134 2135 #define DX_HASH_LEGACY 0 2136 #define DX_HASH_HALF_MD4 1 2137 #define DX_HASH_TEA 2 2138 #define DX_HASH_LEGACY_UNSIGNED 3 2139 #define DX_HASH_HALF_MD4_UNSIGNED 4 2140 #define DX_HASH_TEA_UNSIGNED 5 2141 2142 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 2143 const void *address, unsigned int length) 2144 { 2145 struct { 2146 struct shash_desc shash; 2147 char ctx[4]; 2148 } desc; 2149 2150 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2151 2152 desc.shash.tfm = sbi->s_chksum_driver; 2153 *(u32 *)desc.ctx = crc; 2154 2155 BUG_ON(crypto_shash_update(&desc.shash, address, length)); 2156 2157 return *(u32 *)desc.ctx; 2158 } 2159 2160 #ifdef __KERNEL__ 2161 2162 /* hash info structure used by the directory hash */ 2163 struct dx_hash_info 2164 { 2165 u32 hash; 2166 u32 minor_hash; 2167 int hash_version; 2168 u32 *seed; 2169 }; 2170 2171 2172 /* 32 and 64 bit signed EOF for dx directories */ 2173 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2174 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2175 2176 2177 /* 2178 * Control parameters used by ext4_htree_next_block 2179 */ 2180 #define HASH_NB_ALWAYS 1 2181 2182 struct ext4_filename { 2183 const struct qstr *usr_fname; 2184 struct fscrypt_str disk_name; 2185 struct dx_hash_info hinfo; 2186 #ifdef CONFIG_FS_ENCRYPTION 2187 struct fscrypt_str crypto_buf; 2188 #endif 2189 #ifdef CONFIG_UNICODE 2190 struct fscrypt_str cf_name; 2191 #endif 2192 }; 2193 2194 #define fname_name(p) ((p)->disk_name.name) 2195 #define fname_len(p) ((p)->disk_name.len) 2196 2197 /* 2198 * Describe an inode's exact location on disk and in memory 2199 */ 2200 struct ext4_iloc 2201 { 2202 struct buffer_head *bh; 2203 unsigned long offset; 2204 ext4_group_t block_group; 2205 }; 2206 2207 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2208 { 2209 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2210 } 2211 2212 static inline bool ext4_is_quota_file(struct inode *inode) 2213 { 2214 return IS_NOQUOTA(inode) && 2215 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL); 2216 } 2217 2218 /* 2219 * This structure is stuffed into the struct file's private_data field 2220 * for directories. It is where we put information so that we can do 2221 * readdir operations in hash tree order. 2222 */ 2223 struct dir_private_info { 2224 struct rb_root root; 2225 struct rb_node *curr_node; 2226 struct fname *extra_fname; 2227 loff_t last_pos; 2228 __u32 curr_hash; 2229 __u32 curr_minor_hash; 2230 __u32 next_hash; 2231 }; 2232 2233 /* calculate the first block number of the group */ 2234 static inline ext4_fsblk_t 2235 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2236 { 2237 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2238 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2239 } 2240 2241 /* 2242 * Special error return code only used by dx_probe() and its callers. 2243 */ 2244 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2245 2246 /* htree levels for ext4 */ 2247 #define EXT4_HTREE_LEVEL_COMPAT 2 2248 #define EXT4_HTREE_LEVEL 3 2249 2250 static inline int ext4_dir_htree_level(struct super_block *sb) 2251 { 2252 return ext4_has_feature_largedir(sb) ? 2253 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT; 2254 } 2255 2256 /* 2257 * Timeout and state flag for lazy initialization inode thread. 2258 */ 2259 #define EXT4_DEF_LI_WAIT_MULT 10 2260 #define EXT4_DEF_LI_MAX_START_DELAY 5 2261 #define EXT4_LAZYINIT_QUIT 0x0001 2262 #define EXT4_LAZYINIT_RUNNING 0x0002 2263 2264 /* 2265 * Lazy inode table initialization info 2266 */ 2267 struct ext4_lazy_init { 2268 unsigned long li_state; 2269 struct list_head li_request_list; 2270 struct mutex li_list_mtx; 2271 }; 2272 2273 struct ext4_li_request { 2274 struct super_block *lr_super; 2275 struct ext4_sb_info *lr_sbi; 2276 ext4_group_t lr_next_group; 2277 struct list_head lr_request; 2278 unsigned long lr_next_sched; 2279 unsigned long lr_timeout; 2280 }; 2281 2282 struct ext4_features { 2283 struct kobject f_kobj; 2284 struct completion f_kobj_unregister; 2285 }; 2286 2287 /* 2288 * This structure will be used for multiple mount protection. It will be 2289 * written into the block number saved in the s_mmp_block field in the 2290 * superblock. Programs that check MMP should assume that if 2291 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2292 * to use the filesystem, regardless of how old the timestamp is. 2293 */ 2294 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2295 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2296 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2297 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2298 2299 struct mmp_struct { 2300 __le32 mmp_magic; /* Magic number for MMP */ 2301 __le32 mmp_seq; /* Sequence no. updated periodically */ 2302 2303 /* 2304 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2305 * purposes and do not affect the correctness of the algorithm 2306 */ 2307 __le64 mmp_time; /* Time last updated */ 2308 char mmp_nodename[64]; /* Node which last updated MMP block */ 2309 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2310 2311 /* 2312 * mmp_check_interval is used to verify if the MMP block has been 2313 * updated on the block device. The value is updated based on the 2314 * maximum time to write the MMP block during an update cycle. 2315 */ 2316 __le16 mmp_check_interval; 2317 2318 __le16 mmp_pad1; 2319 __le32 mmp_pad2[226]; 2320 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2321 }; 2322 2323 /* arguments passed to the mmp thread */ 2324 struct mmpd_data { 2325 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2326 struct super_block *sb; /* super block of the fs */ 2327 }; 2328 2329 /* 2330 * Check interval multiplier 2331 * The MMP block is written every update interval and initially checked every 2332 * update interval x the multiplier (the value is then adapted based on the 2333 * write latency). The reason is that writes can be delayed under load and we 2334 * don't want readers to incorrectly assume that the filesystem is no longer 2335 * in use. 2336 */ 2337 #define EXT4_MMP_CHECK_MULT 2UL 2338 2339 /* 2340 * Minimum interval for MMP checking in seconds. 2341 */ 2342 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2343 2344 /* 2345 * Maximum interval for MMP checking in seconds. 2346 */ 2347 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2348 2349 /* 2350 * Function prototypes 2351 */ 2352 2353 /* 2354 * Ok, these declarations are also in <linux/kernel.h> but none of the 2355 * ext4 source programs needs to include it so they are duplicated here. 2356 */ 2357 # define NORET_TYPE /**/ 2358 # define ATTRIB_NORET __attribute__((noreturn)) 2359 # define NORET_AND noreturn, 2360 2361 /* bitmap.c */ 2362 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2363 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2364 struct ext4_group_desc *gdp, 2365 struct buffer_head *bh, int sz); 2366 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2367 struct ext4_group_desc *gdp, 2368 struct buffer_head *bh, int sz); 2369 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2370 struct ext4_group_desc *gdp, 2371 struct buffer_head *bh); 2372 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2373 struct ext4_group_desc *gdp, 2374 struct buffer_head *bh); 2375 2376 /* balloc.c */ 2377 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2378 ext4_fsblk_t blocknr, 2379 ext4_group_t *blockgrpp, 2380 ext4_grpblk_t *offsetp); 2381 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2382 ext4_fsblk_t block); 2383 2384 extern unsigned int ext4_block_group(struct super_block *sb, 2385 ext4_fsblk_t blocknr); 2386 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2387 ext4_fsblk_t blocknr); 2388 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2389 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2390 ext4_group_t group); 2391 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2392 ext4_fsblk_t goal, 2393 unsigned int flags, 2394 unsigned long *count, 2395 int *errp); 2396 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2397 s64 nclusters, unsigned int flags); 2398 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2399 extern void ext4_check_blocks_bitmap(struct super_block *); 2400 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2401 ext4_group_t block_group, 2402 struct buffer_head ** bh); 2403 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2404 2405 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2406 ext4_group_t block_group); 2407 extern int ext4_wait_block_bitmap(struct super_block *sb, 2408 ext4_group_t block_group, 2409 struct buffer_head *bh); 2410 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2411 ext4_group_t block_group); 2412 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2413 ext4_group_t block_group, 2414 struct ext4_group_desc *gdp); 2415 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2416 2417 #ifdef CONFIG_UNICODE 2418 extern void ext4_fname_setup_ci_filename(struct inode *dir, 2419 const struct qstr *iname, 2420 struct fscrypt_str *fname); 2421 #endif 2422 2423 #ifdef CONFIG_FS_ENCRYPTION 2424 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst, 2425 const struct fscrypt_name *src) 2426 { 2427 memset(dst, 0, sizeof(*dst)); 2428 2429 dst->usr_fname = src->usr_fname; 2430 dst->disk_name = src->disk_name; 2431 dst->hinfo.hash = src->hash; 2432 dst->hinfo.minor_hash = src->minor_hash; 2433 dst->crypto_buf = src->crypto_buf; 2434 } 2435 2436 static inline int ext4_fname_setup_filename(struct inode *dir, 2437 const struct qstr *iname, 2438 int lookup, 2439 struct ext4_filename *fname) 2440 { 2441 struct fscrypt_name name; 2442 int err; 2443 2444 err = fscrypt_setup_filename(dir, iname, lookup, &name); 2445 if (err) 2446 return err; 2447 2448 ext4_fname_from_fscrypt_name(fname, &name); 2449 2450 #ifdef CONFIG_UNICODE 2451 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name); 2452 #endif 2453 return 0; 2454 } 2455 2456 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2457 struct dentry *dentry, 2458 struct ext4_filename *fname) 2459 { 2460 struct fscrypt_name name; 2461 int err; 2462 2463 err = fscrypt_prepare_lookup(dir, dentry, &name); 2464 if (err) 2465 return err; 2466 2467 ext4_fname_from_fscrypt_name(fname, &name); 2468 2469 #ifdef CONFIG_UNICODE 2470 ext4_fname_setup_ci_filename(dir, &dentry->d_name, &fname->cf_name); 2471 #endif 2472 return 0; 2473 } 2474 2475 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2476 { 2477 struct fscrypt_name name; 2478 2479 name.crypto_buf = fname->crypto_buf; 2480 fscrypt_free_filename(&name); 2481 2482 fname->crypto_buf.name = NULL; 2483 fname->usr_fname = NULL; 2484 fname->disk_name.name = NULL; 2485 2486 #ifdef CONFIG_UNICODE 2487 kfree(fname->cf_name.name); 2488 fname->cf_name.name = NULL; 2489 #endif 2490 } 2491 #else /* !CONFIG_FS_ENCRYPTION */ 2492 static inline int ext4_fname_setup_filename(struct inode *dir, 2493 const struct qstr *iname, 2494 int lookup, 2495 struct ext4_filename *fname) 2496 { 2497 fname->usr_fname = iname; 2498 fname->disk_name.name = (unsigned char *) iname->name; 2499 fname->disk_name.len = iname->len; 2500 2501 #ifdef CONFIG_UNICODE 2502 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name); 2503 #endif 2504 2505 return 0; 2506 } 2507 2508 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2509 struct dentry *dentry, 2510 struct ext4_filename *fname) 2511 { 2512 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname); 2513 } 2514 2515 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2516 { 2517 #ifdef CONFIG_UNICODE 2518 kfree(fname->cf_name.name); 2519 fname->cf_name.name = NULL; 2520 #endif 2521 } 2522 #endif /* !CONFIG_FS_ENCRYPTION */ 2523 2524 /* dir.c */ 2525 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2526 struct file *, 2527 struct ext4_dir_entry_2 *, 2528 struct buffer_head *, char *, int, 2529 unsigned int); 2530 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2531 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2532 (de), (bh), (buf), (size), (offset))) 2533 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2534 __u32 minor_hash, 2535 struct ext4_dir_entry_2 *dirent, 2536 struct fscrypt_str *ent_name); 2537 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2538 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2539 struct buffer_head *bh, 2540 void *buf, int buf_size, 2541 struct ext4_filename *fname, 2542 struct ext4_dir_entry_2 **dest_de); 2543 void ext4_insert_dentry(struct inode *inode, 2544 struct ext4_dir_entry_2 *de, 2545 int buf_size, 2546 struct ext4_filename *fname); 2547 static inline void ext4_update_dx_flag(struct inode *inode) 2548 { 2549 if (!ext4_has_feature_dir_index(inode->i_sb)) 2550 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2551 } 2552 static const unsigned char ext4_filetype_table[] = { 2553 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2554 }; 2555 2556 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2557 { 2558 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2559 return DT_UNKNOWN; 2560 2561 return ext4_filetype_table[filetype]; 2562 } 2563 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2564 void *buf, int buf_size); 2565 2566 /* fsync.c */ 2567 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2568 2569 /* hash.c */ 2570 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len, 2571 struct dx_hash_info *hinfo); 2572 2573 /* ialloc.c */ 2574 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2575 const struct qstr *qstr, __u32 goal, 2576 uid_t *owner, __u32 i_flags, 2577 int handle_type, unsigned int line_no, 2578 int nblocks); 2579 2580 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \ 2581 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2582 i_flags, 0, 0, 0) 2583 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2584 type, nblocks) \ 2585 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2586 0, (type), __LINE__, (nblocks)) 2587 2588 2589 extern void ext4_free_inode(handle_t *, struct inode *); 2590 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2591 extern unsigned long ext4_count_free_inodes(struct super_block *); 2592 extern unsigned long ext4_count_dirs(struct super_block *); 2593 extern void ext4_check_inodes_bitmap(struct super_block *); 2594 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2595 extern int ext4_init_inode_table(struct super_block *sb, 2596 ext4_group_t group, int barrier); 2597 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2598 2599 /* mballoc.c */ 2600 extern const struct seq_operations ext4_mb_seq_groups_ops; 2601 extern long ext4_mb_stats; 2602 extern long ext4_mb_max_to_scan; 2603 extern int ext4_mb_init(struct super_block *); 2604 extern int ext4_mb_release(struct super_block *); 2605 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2606 struct ext4_allocation_request *, int *); 2607 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2608 extern void ext4_discard_preallocations(struct inode *); 2609 extern int __init ext4_init_mballoc(void); 2610 extern void ext4_exit_mballoc(void); 2611 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2612 struct buffer_head *bh, ext4_fsblk_t block, 2613 unsigned long count, int flags); 2614 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2615 ext4_group_t ngroups); 2616 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2617 ext4_group_t i, struct ext4_group_desc *desc); 2618 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2619 ext4_fsblk_t block, unsigned long count); 2620 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2621 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid); 2622 2623 /* inode.c */ 2624 int ext4_inode_is_fast_symlink(struct inode *inode); 2625 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2626 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2627 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count, 2628 bool wait, struct buffer_head **bhs); 2629 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2630 struct buffer_head *bh_result, int create); 2631 int ext4_get_block(struct inode *inode, sector_t iblock, 2632 struct buffer_head *bh_result, int create); 2633 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2634 struct buffer_head *bh, int create); 2635 int ext4_walk_page_buffers(handle_t *handle, 2636 struct buffer_head *head, 2637 unsigned from, 2638 unsigned to, 2639 int *partial, 2640 int (*fn)(handle_t *handle, 2641 struct buffer_head *bh)); 2642 int do_journal_get_write_access(handle_t *handle, 2643 struct buffer_head *bh); 2644 #define FALL_BACK_TO_NONDELALLOC 1 2645 #define CONVERT_INLINE_DATA 2 2646 2647 typedef enum { 2648 EXT4_IGET_NORMAL = 0, 2649 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */ 2650 EXT4_IGET_HANDLE = 0x0002 /* Inode # is from a handle */ 2651 } ext4_iget_flags; 2652 2653 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, 2654 ext4_iget_flags flags, const char *function, 2655 unsigned int line); 2656 2657 #define ext4_iget(sb, ino, flags) \ 2658 __ext4_iget((sb), (ino), (flags), __func__, __LINE__) 2659 2660 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2661 extern int ext4_setattr(struct dentry *, struct iattr *); 2662 extern int ext4_getattr(const struct path *, struct kstat *, u32, unsigned int); 2663 extern void ext4_evict_inode(struct inode *); 2664 extern void ext4_clear_inode(struct inode *); 2665 extern int ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int); 2666 extern int ext4_sync_inode(handle_t *, struct inode *); 2667 extern void ext4_dirty_inode(struct inode *, int); 2668 extern int ext4_change_inode_journal_flag(struct inode *, int); 2669 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2670 extern int ext4_inode_attach_jinode(struct inode *inode); 2671 extern int ext4_can_truncate(struct inode *inode); 2672 extern int ext4_truncate(struct inode *); 2673 extern int ext4_break_layouts(struct inode *); 2674 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2675 extern void ext4_set_inode_flags(struct inode *); 2676 extern int ext4_alloc_da_blocks(struct inode *inode); 2677 extern void ext4_set_aops(struct inode *inode); 2678 extern int ext4_writepage_trans_blocks(struct inode *); 2679 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2680 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2681 loff_t lstart, loff_t lend); 2682 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf); 2683 extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf); 2684 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2685 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 2686 extern void ext4_da_release_space(struct inode *inode, int to_free); 2687 extern void ext4_da_update_reserve_space(struct inode *inode, 2688 int used, int quota_claim); 2689 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 2690 ext4_fsblk_t pblk, ext4_lblk_t len); 2691 2692 /* indirect.c */ 2693 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2694 struct ext4_map_blocks *map, int flags); 2695 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2696 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2697 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2698 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2699 ext4_lblk_t start, ext4_lblk_t end); 2700 2701 /* ioctl.c */ 2702 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2703 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2704 2705 /* migrate.c */ 2706 extern int ext4_ext_migrate(struct inode *); 2707 extern int ext4_ind_migrate(struct inode *inode); 2708 2709 /* namei.c */ 2710 extern int ext4_dirblock_csum_verify(struct inode *inode, 2711 struct buffer_head *bh); 2712 extern int ext4_orphan_add(handle_t *, struct inode *); 2713 extern int ext4_orphan_del(handle_t *, struct inode *); 2714 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2715 __u32 start_minor_hash, __u32 *next_hash); 2716 extern int ext4_search_dir(struct buffer_head *bh, 2717 char *search_buf, 2718 int buf_size, 2719 struct inode *dir, 2720 struct ext4_filename *fname, 2721 unsigned int offset, 2722 struct ext4_dir_entry_2 **res_dir); 2723 extern int ext4_generic_delete_entry(handle_t *handle, 2724 struct inode *dir, 2725 struct ext4_dir_entry_2 *de_del, 2726 struct buffer_head *bh, 2727 void *entry_buf, 2728 int buf_size, 2729 int csum_size); 2730 extern bool ext4_empty_dir(struct inode *inode); 2731 2732 /* resize.c */ 2733 extern int ext4_group_add(struct super_block *sb, 2734 struct ext4_new_group_data *input); 2735 extern int ext4_group_extend(struct super_block *sb, 2736 struct ext4_super_block *es, 2737 ext4_fsblk_t n_blocks_count); 2738 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2739 2740 /* super.c */ 2741 extern struct buffer_head *ext4_sb_bread(struct super_block *sb, 2742 sector_t block, int op_flags); 2743 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 2744 extern int ext4_calculate_overhead(struct super_block *sb); 2745 extern void ext4_superblock_csum_set(struct super_block *sb); 2746 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 2747 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 2748 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2749 ext4_group_t ngroup); 2750 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2751 char nbuf[16]); 2752 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb, 2753 ext4_group_t block_group, 2754 unsigned int flags); 2755 extern void ext4_set_errno(struct super_block *sb, int err); 2756 2757 extern __printf(4, 5) 2758 void __ext4_error(struct super_block *, const char *, unsigned int, 2759 const char *, ...); 2760 extern __printf(5, 6) 2761 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2762 const char *, ...); 2763 extern __printf(5, 6) 2764 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2765 const char *, ...); 2766 extern void __ext4_std_error(struct super_block *, const char *, 2767 unsigned int, int); 2768 extern __printf(4, 5) 2769 void __ext4_abort(struct super_block *, const char *, unsigned int, 2770 const char *, ...); 2771 extern __printf(4, 5) 2772 void __ext4_warning(struct super_block *, const char *, unsigned int, 2773 const char *, ...); 2774 extern __printf(4, 5) 2775 void __ext4_warning_inode(const struct inode *inode, const char *function, 2776 unsigned int line, const char *fmt, ...); 2777 extern __printf(3, 4) 2778 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2779 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2780 const char *, unsigned int, const char *); 2781 extern __printf(7, 8) 2782 void __ext4_grp_locked_error(const char *, unsigned int, 2783 struct super_block *, ext4_group_t, 2784 unsigned long, ext4_fsblk_t, 2785 const char *, ...); 2786 2787 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 2788 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 2789 2790 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 2791 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 2792 2793 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 2794 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 2795 2796 #ifdef CONFIG_PRINTK 2797 2798 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2799 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__) 2800 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2801 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2802 #define ext4_error(sb, fmt, ...) \ 2803 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2804 #define ext4_abort(sb, fmt, ...) \ 2805 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2806 #define ext4_warning(sb, fmt, ...) \ 2807 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2808 #define ext4_warning_inode(inode, fmt, ...) \ 2809 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 2810 #define ext4_msg(sb, level, fmt, ...) \ 2811 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 2812 #define dump_mmp_msg(sb, mmp, msg) \ 2813 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 2814 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2815 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 2816 fmt, ##__VA_ARGS__) 2817 2818 #else 2819 2820 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2821 do { \ 2822 no_printk(fmt, ##__VA_ARGS__); \ 2823 __ext4_error_inode(inode, "", 0, block, " "); \ 2824 } while (0) 2825 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2826 do { \ 2827 no_printk(fmt, ##__VA_ARGS__); \ 2828 __ext4_error_file(file, "", 0, block, " "); \ 2829 } while (0) 2830 #define ext4_error(sb, fmt, ...) \ 2831 do { \ 2832 no_printk(fmt, ##__VA_ARGS__); \ 2833 __ext4_error(sb, "", 0, " "); \ 2834 } while (0) 2835 #define ext4_abort(sb, fmt, ...) \ 2836 do { \ 2837 no_printk(fmt, ##__VA_ARGS__); \ 2838 __ext4_abort(sb, "", 0, " "); \ 2839 } while (0) 2840 #define ext4_warning(sb, fmt, ...) \ 2841 do { \ 2842 no_printk(fmt, ##__VA_ARGS__); \ 2843 __ext4_warning(sb, "", 0, " "); \ 2844 } while (0) 2845 #define ext4_warning_inode(inode, fmt, ...) \ 2846 do { \ 2847 no_printk(fmt, ##__VA_ARGS__); \ 2848 __ext4_warning_inode(inode, "", 0, " "); \ 2849 } while (0) 2850 #define ext4_msg(sb, level, fmt, ...) \ 2851 do { \ 2852 no_printk(fmt, ##__VA_ARGS__); \ 2853 __ext4_msg(sb, "", " "); \ 2854 } while (0) 2855 #define dump_mmp_msg(sb, mmp, msg) \ 2856 __dump_mmp_msg(sb, mmp, "", 0, "") 2857 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2858 do { \ 2859 no_printk(fmt, ##__VA_ARGS__); \ 2860 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 2861 } while (0) 2862 2863 #endif 2864 2865 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2866 __u32 compat); 2867 extern int ext4_update_rocompat_feature(handle_t *handle, 2868 struct super_block *sb, __u32 rocompat); 2869 extern int ext4_update_incompat_feature(handle_t *handle, 2870 struct super_block *sb, __u32 incompat); 2871 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2872 struct ext4_group_desc *bg); 2873 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2874 struct ext4_group_desc *bg); 2875 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2876 struct ext4_group_desc *bg); 2877 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2878 struct ext4_group_desc *bg); 2879 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2880 struct ext4_group_desc *bg); 2881 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2882 struct ext4_group_desc *bg); 2883 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2884 struct ext4_group_desc *bg); 2885 extern void ext4_block_bitmap_set(struct super_block *sb, 2886 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2887 extern void ext4_inode_bitmap_set(struct super_block *sb, 2888 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2889 extern void ext4_inode_table_set(struct super_block *sb, 2890 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2891 extern void ext4_free_group_clusters_set(struct super_block *sb, 2892 struct ext4_group_desc *bg, 2893 __u32 count); 2894 extern void ext4_free_inodes_set(struct super_block *sb, 2895 struct ext4_group_desc *bg, __u32 count); 2896 extern void ext4_used_dirs_set(struct super_block *sb, 2897 struct ext4_group_desc *bg, __u32 count); 2898 extern void ext4_itable_unused_set(struct super_block *sb, 2899 struct ext4_group_desc *bg, __u32 count); 2900 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2901 struct ext4_group_desc *gdp); 2902 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2903 struct ext4_group_desc *gdp); 2904 extern int ext4_register_li_request(struct super_block *sb, 2905 ext4_group_t first_not_zeroed); 2906 2907 static inline int ext4_has_metadata_csum(struct super_block *sb) 2908 { 2909 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 2910 !EXT4_SB(sb)->s_chksum_driver); 2911 2912 return ext4_has_feature_metadata_csum(sb) && 2913 (EXT4_SB(sb)->s_chksum_driver != NULL); 2914 } 2915 2916 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2917 { 2918 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb); 2919 } 2920 2921 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2922 { 2923 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2924 le32_to_cpu(es->s_blocks_count_lo); 2925 } 2926 2927 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2928 { 2929 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2930 le32_to_cpu(es->s_r_blocks_count_lo); 2931 } 2932 2933 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2934 { 2935 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2936 le32_to_cpu(es->s_free_blocks_count_lo); 2937 } 2938 2939 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2940 ext4_fsblk_t blk) 2941 { 2942 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2943 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2944 } 2945 2946 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2947 ext4_fsblk_t blk) 2948 { 2949 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2950 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2951 } 2952 2953 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2954 ext4_fsblk_t blk) 2955 { 2956 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2957 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2958 } 2959 2960 static inline loff_t ext4_isize(struct super_block *sb, 2961 struct ext4_inode *raw_inode) 2962 { 2963 if (ext4_has_feature_largedir(sb) || 2964 S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2965 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2966 le32_to_cpu(raw_inode->i_size_lo); 2967 2968 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2969 } 2970 2971 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2972 { 2973 raw_inode->i_size_lo = cpu_to_le32(i_size); 2974 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2975 } 2976 2977 static inline 2978 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2979 ext4_group_t group) 2980 { 2981 struct ext4_group_info ***grp_info; 2982 long indexv, indexh; 2983 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 2984 grp_info = EXT4_SB(sb)->s_group_info; 2985 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2986 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2987 return grp_info[indexv][indexh]; 2988 } 2989 2990 /* 2991 * Reading s_groups_count requires using smp_rmb() afterwards. See 2992 * the locking protocol documented in the comments of ext4_group_add() 2993 * in resize.c 2994 */ 2995 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2996 { 2997 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2998 2999 smp_rmb(); 3000 return ngroups; 3001 } 3002 3003 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 3004 ext4_group_t block_group) 3005 { 3006 return block_group >> sbi->s_log_groups_per_flex; 3007 } 3008 3009 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 3010 { 3011 return 1 << sbi->s_log_groups_per_flex; 3012 } 3013 3014 #define ext4_std_error(sb, errno) \ 3015 do { \ 3016 if ((errno)) \ 3017 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 3018 } while (0) 3019 3020 #ifdef CONFIG_SMP 3021 /* Each CPU can accumulate percpu_counter_batch clusters in their local 3022 * counters. So we need to make sure we have free clusters more 3023 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 3024 */ 3025 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 3026 #else 3027 #define EXT4_FREECLUSTERS_WATERMARK 0 3028 #endif 3029 3030 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 3031 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 3032 { 3033 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 3034 !inode_is_locked(inode)); 3035 down_write(&EXT4_I(inode)->i_data_sem); 3036 if (newsize > EXT4_I(inode)->i_disksize) 3037 EXT4_I(inode)->i_disksize = newsize; 3038 up_write(&EXT4_I(inode)->i_data_sem); 3039 } 3040 3041 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 3042 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 3043 { 3044 int changed = 0; 3045 3046 if (newsize > inode->i_size) { 3047 i_size_write(inode, newsize); 3048 changed = 1; 3049 } 3050 if (newsize > EXT4_I(inode)->i_disksize) { 3051 ext4_update_i_disksize(inode, newsize); 3052 changed |= 2; 3053 } 3054 return changed; 3055 } 3056 3057 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 3058 loff_t len); 3059 3060 struct ext4_group_info { 3061 unsigned long bb_state; 3062 struct rb_root bb_free_root; 3063 ext4_grpblk_t bb_first_free; /* first free block */ 3064 ext4_grpblk_t bb_free; /* total free blocks */ 3065 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 3066 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 3067 struct list_head bb_prealloc_list; 3068 #ifdef DOUBLE_CHECK 3069 void *bb_bitmap; 3070 #endif 3071 struct rw_semaphore alloc_sem; 3072 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 3073 * regions, index is order. 3074 * bb_counters[3] = 5 means 3075 * 5 free 8-block regions. */ 3076 }; 3077 3078 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 3079 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 3080 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 3081 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 3082 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \ 3083 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT) 3084 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \ 3085 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT) 3086 3087 #define EXT4_MB_GRP_NEED_INIT(grp) \ 3088 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 3089 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 3090 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3091 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 3092 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3093 3094 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 3095 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3096 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 3097 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3098 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 3099 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3100 3101 #define EXT4_MAX_CONTENTION 8 3102 #define EXT4_CONTENTION_THRESHOLD 2 3103 3104 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 3105 ext4_group_t group) 3106 { 3107 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 3108 } 3109 3110 /* 3111 * Returns true if the filesystem is busy enough that attempts to 3112 * access the block group locks has run into contention. 3113 */ 3114 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 3115 { 3116 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 3117 } 3118 3119 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 3120 { 3121 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 3122 if (spin_trylock(lock)) 3123 /* 3124 * We're able to grab the lock right away, so drop the 3125 * lock contention counter. 3126 */ 3127 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 3128 else { 3129 /* 3130 * The lock is busy, so bump the contention counter, 3131 * and then wait on the spin lock. 3132 */ 3133 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 3134 EXT4_MAX_CONTENTION); 3135 spin_lock(lock); 3136 } 3137 } 3138 3139 static inline void ext4_unlock_group(struct super_block *sb, 3140 ext4_group_t group) 3141 { 3142 spin_unlock(ext4_group_lock_ptr(sb, group)); 3143 } 3144 3145 /* 3146 * Block validity checking 3147 */ 3148 #define ext4_check_indirect_blockref(inode, bh) \ 3149 ext4_check_blockref(__func__, __LINE__, inode, \ 3150 (__le32 *)(bh)->b_data, \ 3151 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 3152 3153 #define ext4_ind_check_inode(inode) \ 3154 ext4_check_blockref(__func__, __LINE__, inode, \ 3155 EXT4_I(inode)->i_data, \ 3156 EXT4_NDIR_BLOCKS) 3157 3158 /* 3159 * Inodes and files operations 3160 */ 3161 3162 /* dir.c */ 3163 extern const struct file_operations ext4_dir_operations; 3164 3165 #ifdef CONFIG_UNICODE 3166 extern const struct dentry_operations ext4_dentry_ops; 3167 #endif 3168 3169 /* file.c */ 3170 extern const struct inode_operations ext4_file_inode_operations; 3171 extern const struct file_operations ext4_file_operations; 3172 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 3173 3174 /* inline.c */ 3175 extern int ext4_get_max_inline_size(struct inode *inode); 3176 extern int ext4_find_inline_data_nolock(struct inode *inode); 3177 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 3178 unsigned int len); 3179 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 3180 3181 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 3182 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 3183 struct inode *inode, 3184 loff_t pos, unsigned len, 3185 unsigned flags, 3186 struct page **pagep); 3187 extern int ext4_write_inline_data_end(struct inode *inode, 3188 loff_t pos, unsigned len, 3189 unsigned copied, 3190 struct page *page); 3191 extern struct buffer_head * 3192 ext4_journalled_write_inline_data(struct inode *inode, 3193 unsigned len, 3194 struct page *page); 3195 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 3196 struct inode *inode, 3197 loff_t pos, unsigned len, 3198 unsigned flags, 3199 struct page **pagep, 3200 void **fsdata); 3201 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 3202 unsigned len, unsigned copied, 3203 struct page *page); 3204 extern int ext4_try_add_inline_entry(handle_t *handle, 3205 struct ext4_filename *fname, 3206 struct inode *dir, struct inode *inode); 3207 extern int ext4_try_create_inline_dir(handle_t *handle, 3208 struct inode *parent, 3209 struct inode *inode); 3210 extern int ext4_read_inline_dir(struct file *filp, 3211 struct dir_context *ctx, 3212 int *has_inline_data); 3213 extern int ext4_inlinedir_to_tree(struct file *dir_file, 3214 struct inode *dir, ext4_lblk_t block, 3215 struct dx_hash_info *hinfo, 3216 __u32 start_hash, __u32 start_minor_hash, 3217 int *has_inline_data); 3218 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3219 struct ext4_filename *fname, 3220 struct ext4_dir_entry_2 **res_dir, 3221 int *has_inline_data); 3222 extern int ext4_delete_inline_entry(handle_t *handle, 3223 struct inode *dir, 3224 struct ext4_dir_entry_2 *de_del, 3225 struct buffer_head *bh, 3226 int *has_inline_data); 3227 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); 3228 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3229 struct ext4_dir_entry_2 **parent_de, 3230 int *retval); 3231 extern int ext4_inline_data_fiemap(struct inode *inode, 3232 struct fiemap_extent_info *fieinfo, 3233 int *has_inline, __u64 start, __u64 len); 3234 3235 struct iomap; 3236 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap); 3237 3238 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3239 3240 extern int ext4_convert_inline_data(struct inode *inode); 3241 3242 static inline int ext4_has_inline_data(struct inode *inode) 3243 { 3244 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3245 EXT4_I(inode)->i_inline_off; 3246 } 3247 3248 /* namei.c */ 3249 extern const struct inode_operations ext4_dir_inode_operations; 3250 extern const struct inode_operations ext4_special_inode_operations; 3251 extern struct dentry *ext4_get_parent(struct dentry *child); 3252 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3253 struct ext4_dir_entry_2 *de, 3254 int blocksize, int csum_size, 3255 unsigned int parent_ino, int dotdot_real_len); 3256 extern void ext4_initialize_dirent_tail(struct buffer_head *bh, 3257 unsigned int blocksize); 3258 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode, 3259 struct buffer_head *bh); 3260 extern int ext4_ci_compare(const struct inode *parent, 3261 const struct qstr *fname, 3262 const struct qstr *entry, bool quick); 3263 3264 #define S_SHIFT 12 3265 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = { 3266 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3267 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3268 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3269 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3270 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3271 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3272 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3273 }; 3274 3275 static inline void ext4_set_de_type(struct super_block *sb, 3276 struct ext4_dir_entry_2 *de, 3277 umode_t mode) { 3278 if (ext4_has_feature_filetype(sb)) 3279 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3280 } 3281 3282 /* readpages.c */ 3283 extern int ext4_mpage_readpages(struct address_space *mapping, 3284 struct list_head *pages, struct page *page, 3285 unsigned nr_pages, bool is_readahead); 3286 extern int __init ext4_init_post_read_processing(void); 3287 extern void ext4_exit_post_read_processing(void); 3288 3289 /* symlink.c */ 3290 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3291 extern const struct inode_operations ext4_symlink_inode_operations; 3292 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3293 3294 /* sysfs.c */ 3295 extern int ext4_register_sysfs(struct super_block *sb); 3296 extern void ext4_unregister_sysfs(struct super_block *sb); 3297 extern int __init ext4_init_sysfs(void); 3298 extern void ext4_exit_sysfs(void); 3299 3300 /* block_validity */ 3301 extern void ext4_release_system_zone(struct super_block *sb); 3302 extern int ext4_setup_system_zone(struct super_block *sb); 3303 extern int __init ext4_init_system_zone(void); 3304 extern void ext4_exit_system_zone(void); 3305 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 3306 ext4_fsblk_t start_blk, 3307 unsigned int count); 3308 extern int ext4_check_blockref(const char *, unsigned int, 3309 struct inode *, __le32 *, unsigned int); 3310 3311 /* extents.c */ 3312 struct ext4_ext_path; 3313 struct ext4_extent; 3314 3315 /* 3316 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3317 * __le32. 3318 */ 3319 #define EXT_MAX_BLOCKS 0xffffffff 3320 3321 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 3322 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 3323 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3324 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3325 struct ext4_map_blocks *map, int flags); 3326 extern int ext4_ext_truncate(handle_t *, struct inode *); 3327 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3328 ext4_lblk_t end); 3329 extern void ext4_ext_init(struct super_block *); 3330 extern void ext4_ext_release(struct super_block *); 3331 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3332 loff_t len); 3333 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3334 loff_t offset, ssize_t len); 3335 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle, 3336 ext4_io_end_t *io_end); 3337 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3338 struct ext4_map_blocks *map, int flags); 3339 extern int ext4_ext_calc_metadata_amount(struct inode *inode, 3340 ext4_lblk_t lblocks); 3341 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3342 int num, 3343 struct ext4_ext_path *path); 3344 extern int ext4_can_extents_be_merged(struct inode *inode, 3345 struct ext4_extent *ex1, 3346 struct ext4_extent *ex2); 3347 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3348 struct ext4_ext_path **, 3349 struct ext4_extent *, int); 3350 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3351 struct ext4_ext_path **, 3352 int flags); 3353 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 3354 extern int ext4_ext_check_inode(struct inode *inode); 3355 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3356 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3357 __u64 start, __u64 len); 3358 extern int ext4_get_es_cache(struct inode *inode, 3359 struct fiemap_extent_info *fieinfo, 3360 __u64 start, __u64 len); 3361 extern int ext4_ext_precache(struct inode *inode); 3362 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len); 3363 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len); 3364 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3365 struct inode *inode2, ext4_lblk_t lblk1, 3366 ext4_lblk_t lblk2, ext4_lblk_t count, 3367 int mark_unwritten,int *err); 3368 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu); 3369 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode, 3370 int check_cred, int restart_cred, 3371 int revoke_cred); 3372 3373 3374 /* move_extent.c */ 3375 extern void ext4_double_down_write_data_sem(struct inode *first, 3376 struct inode *second); 3377 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3378 struct inode *donor_inode); 3379 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3380 __u64 start_orig, __u64 start_donor, 3381 __u64 len, __u64 *moved_len); 3382 3383 /* page-io.c */ 3384 extern int __init ext4_init_pageio(void); 3385 extern void ext4_exit_pageio(void); 3386 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3387 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3388 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3389 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3390 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3391 struct writeback_control *wbc); 3392 extern void ext4_end_io_rsv_work(struct work_struct *work); 3393 extern void ext4_io_submit(struct ext4_io_submit *io); 3394 extern int ext4_bio_write_page(struct ext4_io_submit *io, 3395 struct page *page, 3396 int len, 3397 struct writeback_control *wbc, 3398 bool keep_towrite); 3399 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end); 3400 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end); 3401 3402 /* mmp.c */ 3403 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3404 3405 /* verity.c */ 3406 extern const struct fsverity_operations ext4_verityops; 3407 3408 /* 3409 * Add new method to test whether block and inode bitmaps are properly 3410 * initialized. With uninit_bg reading the block from disk is not enough 3411 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3412 */ 3413 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3414 3415 static inline int bitmap_uptodate(struct buffer_head *bh) 3416 { 3417 return (buffer_uptodate(bh) && 3418 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3419 } 3420 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3421 { 3422 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3423 } 3424 3425 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3426 3427 /* For ioend & aio unwritten conversion wait queues */ 3428 #define EXT4_WQ_HASH_SZ 37 3429 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3430 EXT4_WQ_HASH_SZ]) 3431 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3432 3433 extern int ext4_resize_begin(struct super_block *sb); 3434 extern void ext4_resize_end(struct super_block *sb); 3435 3436 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 3437 struct ext4_io_end *io_end) 3438 { 3439 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 3440 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3441 atomic_inc(&EXT4_I(inode)->i_unwritten); 3442 } 3443 } 3444 3445 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3446 { 3447 struct inode *inode = io_end->inode; 3448 3449 if (io_end->flag & EXT4_IO_END_UNWRITTEN) { 3450 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3451 /* Wake up anyone waiting on unwritten extent conversion */ 3452 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) 3453 wake_up_all(ext4_ioend_wq(inode)); 3454 } 3455 } 3456 3457 extern const struct iomap_ops ext4_iomap_ops; 3458 extern const struct iomap_ops ext4_iomap_report_ops; 3459 3460 static inline int ext4_buffer_uptodate(struct buffer_head *bh) 3461 { 3462 /* 3463 * If the buffer has the write error flag, we have failed 3464 * to write out data in the block. In this case, we don't 3465 * have to read the block because we may read the old data 3466 * successfully. 3467 */ 3468 if (!buffer_uptodate(bh) && buffer_write_io_error(bh)) 3469 set_buffer_uptodate(bh); 3470 return buffer_uptodate(bh); 3471 } 3472 3473 #endif /* __KERNEL__ */ 3474 3475 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3476 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3477 3478 #endif /* _EXT4_H */ 3479