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 enable ext4_ext_show_path/leaf/move in extents.c 85 */ 86 #define EXT_DEBUG__ 87 88 /* 89 * Dynamic printk for controlled extents debugging. 90 */ 91 #ifdef CONFIG_EXT4_DEBUG 92 #define ext_debug(ino, fmt, ...) \ 93 pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt, \ 94 current->comm, task_pid_nr(current), \ 95 ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__, \ 96 __func__, ##__VA_ARGS__) 97 #else 98 #define ext_debug(ino, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 99 #endif 100 101 /* data type for block offset of block group */ 102 typedef int ext4_grpblk_t; 103 104 /* data type for filesystem-wide blocks number */ 105 typedef unsigned long long ext4_fsblk_t; 106 107 /* data type for file logical block number */ 108 typedef __u32 ext4_lblk_t; 109 110 /* data type for block group number */ 111 typedef unsigned int ext4_group_t; 112 113 enum SHIFT_DIRECTION { 114 SHIFT_LEFT = 0, 115 SHIFT_RIGHT, 116 }; 117 118 /* 119 * Flags used in mballoc's allocation_context flags field. 120 * 121 * Also used to show what's going on for debugging purposes when the 122 * flag field is exported via the traceport interface 123 */ 124 125 /* prefer goal again. length */ 126 #define EXT4_MB_HINT_MERGE 0x0001 127 /* blocks already reserved */ 128 #define EXT4_MB_HINT_RESERVED 0x0002 129 /* metadata is being allocated */ 130 #define EXT4_MB_HINT_METADATA 0x0004 131 /* first blocks in the file */ 132 #define EXT4_MB_HINT_FIRST 0x0008 133 /* search for the best chunk */ 134 #define EXT4_MB_HINT_BEST 0x0010 135 /* data is being allocated */ 136 #define EXT4_MB_HINT_DATA 0x0020 137 /* don't preallocate (for tails) */ 138 #define EXT4_MB_HINT_NOPREALLOC 0x0040 139 /* allocate for locality group */ 140 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 141 /* allocate goal blocks or none */ 142 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 143 /* goal is meaningful */ 144 #define EXT4_MB_HINT_TRY_GOAL 0x0200 145 /* blocks already pre-reserved by delayed allocation */ 146 #define EXT4_MB_DELALLOC_RESERVED 0x0400 147 /* We are doing stream allocation */ 148 #define EXT4_MB_STREAM_ALLOC 0x0800 149 /* Use reserved root blocks if needed */ 150 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 151 /* Use blocks from reserved pool */ 152 #define EXT4_MB_USE_RESERVED 0x2000 153 /* Do strict check for free blocks while retrying block allocation */ 154 #define EXT4_MB_STRICT_CHECK 0x4000 155 156 struct ext4_allocation_request { 157 /* target inode for block we're allocating */ 158 struct inode *inode; 159 /* how many blocks we want to allocate */ 160 unsigned int len; 161 /* logical block in target inode */ 162 ext4_lblk_t logical; 163 /* the closest logical allocated block to the left */ 164 ext4_lblk_t lleft; 165 /* the closest logical allocated block to the right */ 166 ext4_lblk_t lright; 167 /* phys. target (a hint) */ 168 ext4_fsblk_t goal; 169 /* phys. block for the closest logical allocated block to the left */ 170 ext4_fsblk_t pleft; 171 /* phys. block for the closest logical allocated block to the right */ 172 ext4_fsblk_t pright; 173 /* flags. see above EXT4_MB_HINT_* */ 174 unsigned int flags; 175 }; 176 177 /* 178 * Logical to physical block mapping, used by ext4_map_blocks() 179 * 180 * This structure is used to pass requests into ext4_map_blocks() as 181 * well as to store the information returned by ext4_map_blocks(). It 182 * takes less room on the stack than a struct buffer_head. 183 */ 184 #define EXT4_MAP_NEW BIT(BH_New) 185 #define EXT4_MAP_MAPPED BIT(BH_Mapped) 186 #define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten) 187 #define EXT4_MAP_BOUNDARY BIT(BH_Boundary) 188 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 189 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 190 191 struct ext4_map_blocks { 192 ext4_fsblk_t m_pblk; 193 ext4_lblk_t m_lblk; 194 unsigned int m_len; 195 unsigned int m_flags; 196 }; 197 198 /* 199 * Block validity checking, system zone rbtree. 200 */ 201 struct ext4_system_blocks { 202 struct rb_root root; 203 struct rcu_head rcu; 204 }; 205 206 /* 207 * Flags for ext4_io_end->flags 208 */ 209 #define EXT4_IO_END_UNWRITTEN 0x0001 210 211 struct ext4_io_end_vec { 212 struct list_head list; /* list of io_end_vec */ 213 loff_t offset; /* offset in the file */ 214 ssize_t size; /* size of the extent */ 215 }; 216 217 /* 218 * For converting unwritten extents on a work queue. 'handle' is used for 219 * buffered writeback. 220 */ 221 typedef struct ext4_io_end { 222 struct list_head list; /* per-file finished IO list */ 223 handle_t *handle; /* handle reserved for extent 224 * conversion */ 225 struct inode *inode; /* file being written to */ 226 struct bio *bio; /* Linked list of completed 227 * bios covering the extent */ 228 unsigned int flag; /* unwritten or not */ 229 atomic_t count; /* reference counter */ 230 struct list_head list_vec; /* list of ext4_io_end_vec */ 231 } ext4_io_end_t; 232 233 struct ext4_io_submit { 234 struct writeback_control *io_wbc; 235 struct bio *io_bio; 236 ext4_io_end_t *io_end; 237 sector_t io_next_block; 238 }; 239 240 /* 241 * Special inodes numbers 242 */ 243 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 244 #define EXT4_ROOT_INO 2 /* Root inode */ 245 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 246 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 247 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 248 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 249 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 250 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 251 252 /* First non-reserved inode for old ext4 filesystems */ 253 #define EXT4_GOOD_OLD_FIRST_INO 11 254 255 /* 256 * Maximal count of links to a file 257 */ 258 #define EXT4_LINK_MAX 65000 259 260 /* 261 * Macro-instructions used to manage several block sizes 262 */ 263 #define EXT4_MIN_BLOCK_SIZE 1024 264 #define EXT4_MAX_BLOCK_SIZE 65536 265 #define EXT4_MIN_BLOCK_LOG_SIZE 10 266 #define EXT4_MAX_BLOCK_LOG_SIZE 16 267 #define EXT4_MAX_CLUSTER_LOG_SIZE 30 268 #ifdef __KERNEL__ 269 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 270 #else 271 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 272 #endif 273 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 274 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 275 EXT4_SB(s)->s_cluster_bits) 276 #ifdef __KERNEL__ 277 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 278 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 279 #else 280 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 281 #endif 282 #ifdef __KERNEL__ 283 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 284 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 285 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 286 #else 287 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 288 EXT4_GOOD_OLD_INODE_SIZE : \ 289 (s)->s_inode_size) 290 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 291 EXT4_GOOD_OLD_FIRST_INO : \ 292 (s)->s_first_ino) 293 #endif 294 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 295 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \ 296 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \ 297 blkbits)) 298 299 /* Translate a block number to a cluster number */ 300 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 301 /* Translate a cluster number to a block number */ 302 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 303 /* Translate # of blks to # of clusters */ 304 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 305 (sbi)->s_cluster_bits) 306 /* Mask out the low bits to get the starting block of the cluster */ 307 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 308 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 309 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 310 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 311 /* Fill in the low bits to get the last block of the cluster */ 312 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \ 313 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1)) 314 /* Get the cluster offset */ 315 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 316 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 317 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 318 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 319 320 /* 321 * Structure of a blocks group descriptor 322 */ 323 struct ext4_group_desc 324 { 325 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 326 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 327 __le32 bg_inode_table_lo; /* Inodes table block */ 328 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 329 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 330 __le16 bg_used_dirs_count_lo; /* Directories count */ 331 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 332 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 333 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 334 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 335 __le16 bg_itable_unused_lo; /* Unused inodes count */ 336 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 337 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 338 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 339 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 340 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 341 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 342 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 343 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 344 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 345 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 346 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 347 __u32 bg_reserved; 348 }; 349 350 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 351 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 352 sizeof(__le16)) 353 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 354 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 355 sizeof(__le16)) 356 357 /* 358 * Structure of a flex block group info 359 */ 360 361 struct flex_groups { 362 atomic64_t free_clusters; 363 atomic_t free_inodes; 364 atomic_t used_dirs; 365 }; 366 367 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 368 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 369 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 370 371 /* 372 * Macro-instructions used to manage group descriptors 373 */ 374 #define EXT4_MIN_DESC_SIZE 32 375 #define EXT4_MIN_DESC_SIZE_64BIT 64 376 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 377 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 378 #ifdef __KERNEL__ 379 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 380 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 381 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 382 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 383 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 384 #else 385 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 386 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 387 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 388 #endif 389 390 /* 391 * Constants relative to the data blocks 392 */ 393 #define EXT4_NDIR_BLOCKS 12 394 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 395 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 396 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 397 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 398 399 /* 400 * Inode flags 401 */ 402 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 403 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 404 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 405 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 406 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 407 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 408 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 409 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 410 /* Reserved for compression usage... */ 411 #define EXT4_DIRTY_FL 0x00000100 412 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 413 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 414 /* nb: was previously EXT2_ECOMPR_FL */ 415 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 416 /* End compression flags --- maybe not all used */ 417 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 418 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 419 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 420 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 421 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 422 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 423 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 424 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 425 #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */ 426 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 427 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */ 428 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 429 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 430 #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */ 431 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 432 433 #define EXT4_FL_USER_VISIBLE 0x705BDFFF /* User visible flags */ 434 #define EXT4_FL_USER_MODIFIABLE 0x604BC0FF /* User modifiable flags */ 435 436 /* Flags we can manipulate with through EXT4_IOC_FSSETXATTR */ 437 #define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \ 438 EXT4_IMMUTABLE_FL | \ 439 EXT4_APPEND_FL | \ 440 EXT4_NODUMP_FL | \ 441 EXT4_NOATIME_FL | \ 442 EXT4_PROJINHERIT_FL) 443 444 /* Flags that should be inherited by new inodes from their parent. */ 445 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 446 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 447 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 448 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 449 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL) 450 451 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 452 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\ 453 EXT4_PROJINHERIT_FL)) 454 455 /* Flags that are appropriate for non-directories/regular files. */ 456 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 457 458 /* The only flags that should be swapped */ 459 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL) 460 461 /* Mask out flags that are inappropriate for the given type of inode. */ 462 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 463 { 464 if (S_ISDIR(mode)) 465 return flags; 466 else if (S_ISREG(mode)) 467 return flags & EXT4_REG_FLMASK; 468 else 469 return flags & EXT4_OTHER_FLMASK; 470 } 471 472 /* 473 * Inode flags used for atomic set/get 474 */ 475 enum { 476 EXT4_INODE_SECRM = 0, /* Secure deletion */ 477 EXT4_INODE_UNRM = 1, /* Undelete */ 478 EXT4_INODE_COMPR = 2, /* Compress file */ 479 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 480 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 481 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 482 EXT4_INODE_NODUMP = 6, /* do not dump file */ 483 EXT4_INODE_NOATIME = 7, /* do not update atime */ 484 /* Reserved for compression usage... */ 485 EXT4_INODE_DIRTY = 8, 486 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 487 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 488 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 489 /* End compression flags --- maybe not all used */ 490 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 491 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 492 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 493 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 494 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 495 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 496 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 497 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 498 EXT4_INODE_VERITY = 20, /* Verity protected inode */ 499 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 500 /* 22 was formerly EXT4_INODE_EOFBLOCKS */ 501 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 502 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 503 EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */ 504 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 505 }; 506 507 /* 508 * Since it's pretty easy to mix up bit numbers and hex values, we use a 509 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 510 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 511 * any extra space in the compiled kernel image, otherwise, the build will fail. 512 * It's important that these values are the same, since we are using 513 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 514 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 515 * values found in ext2, ext3 and ext4 filesystems, and of course the values 516 * defined in e2fsprogs. 517 * 518 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 519 */ 520 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 521 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 522 523 static inline void ext4_check_flag_values(void) 524 { 525 CHECK_FLAG_VALUE(SECRM); 526 CHECK_FLAG_VALUE(UNRM); 527 CHECK_FLAG_VALUE(COMPR); 528 CHECK_FLAG_VALUE(SYNC); 529 CHECK_FLAG_VALUE(IMMUTABLE); 530 CHECK_FLAG_VALUE(APPEND); 531 CHECK_FLAG_VALUE(NODUMP); 532 CHECK_FLAG_VALUE(NOATIME); 533 CHECK_FLAG_VALUE(DIRTY); 534 CHECK_FLAG_VALUE(COMPRBLK); 535 CHECK_FLAG_VALUE(NOCOMPR); 536 CHECK_FLAG_VALUE(ENCRYPT); 537 CHECK_FLAG_VALUE(INDEX); 538 CHECK_FLAG_VALUE(IMAGIC); 539 CHECK_FLAG_VALUE(JOURNAL_DATA); 540 CHECK_FLAG_VALUE(NOTAIL); 541 CHECK_FLAG_VALUE(DIRSYNC); 542 CHECK_FLAG_VALUE(TOPDIR); 543 CHECK_FLAG_VALUE(HUGE_FILE); 544 CHECK_FLAG_VALUE(EXTENTS); 545 CHECK_FLAG_VALUE(VERITY); 546 CHECK_FLAG_VALUE(EA_INODE); 547 CHECK_FLAG_VALUE(INLINE_DATA); 548 CHECK_FLAG_VALUE(PROJINHERIT); 549 CHECK_FLAG_VALUE(CASEFOLD); 550 CHECK_FLAG_VALUE(RESERVED); 551 } 552 553 /* Used to pass group descriptor data when online resize is done */ 554 struct ext4_new_group_input { 555 __u32 group; /* Group number for this data */ 556 __u64 block_bitmap; /* Absolute block number of block bitmap */ 557 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 558 __u64 inode_table; /* Absolute block number of inode table start */ 559 __u32 blocks_count; /* Total number of blocks in this group */ 560 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 561 __u16 unused; 562 }; 563 564 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 565 struct compat_ext4_new_group_input { 566 u32 group; 567 compat_u64 block_bitmap; 568 compat_u64 inode_bitmap; 569 compat_u64 inode_table; 570 u32 blocks_count; 571 u16 reserved_blocks; 572 u16 unused; 573 }; 574 #endif 575 576 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 577 struct ext4_new_group_data { 578 __u32 group; 579 __u64 block_bitmap; 580 __u64 inode_bitmap; 581 __u64 inode_table; 582 __u32 blocks_count; 583 __u16 reserved_blocks; 584 __u16 mdata_blocks; 585 __u32 free_clusters_count; 586 }; 587 588 /* Indexes used to index group tables in ext4_new_group_data */ 589 enum { 590 BLOCK_BITMAP = 0, /* block bitmap */ 591 INODE_BITMAP, /* inode bitmap */ 592 INODE_TABLE, /* inode tables */ 593 GROUP_TABLE_COUNT, 594 }; 595 596 /* 597 * Flags used by ext4_map_blocks() 598 */ 599 /* Allocate any needed blocks and/or convert an unwritten 600 extent to be an initialized ext4 */ 601 #define EXT4_GET_BLOCKS_CREATE 0x0001 602 /* Request the creation of an unwritten extent */ 603 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 604 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 605 EXT4_GET_BLOCKS_CREATE) 606 /* Caller is from the delayed allocation writeout path 607 * finally doing the actual allocation of delayed blocks */ 608 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 609 /* caller is from the direct IO path, request to creation of an 610 unwritten extents if not allocated, split the unwritten 611 extent if blocks has been preallocated already*/ 612 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 613 #define EXT4_GET_BLOCKS_CONVERT 0x0010 614 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 615 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 616 /* Convert extent to initialized after IO complete */ 617 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 618 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 619 /* Eventual metadata allocation (due to growing extent tree) 620 * should not fail, so try to use reserved blocks for that.*/ 621 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 622 /* Don't normalize allocation size (used for fallocate) */ 623 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 624 /* Convert written extents to unwritten */ 625 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 626 /* Write zeros to newly created written extents */ 627 #define EXT4_GET_BLOCKS_ZERO 0x0200 628 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 629 EXT4_GET_BLOCKS_ZERO) 630 /* Caller will submit data before dropping transaction handle. This 631 * allows jbd2 to avoid submitting data before commit. */ 632 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 633 634 /* 635 * The bit position of these flags must not overlap with any of the 636 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 637 * read_extent_tree_block(), ext4_split_extent_at(), 638 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 639 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 640 * caching the extents when reading from the extent tree while a 641 * truncate or punch hole operation is in progress. 642 */ 643 #define EXT4_EX_NOCACHE 0x40000000 644 #define EXT4_EX_FORCE_CACHE 0x20000000 645 #define EXT4_EX_NOFAIL 0x10000000 646 647 /* 648 * Flags used by ext4_free_blocks 649 */ 650 #define EXT4_FREE_BLOCKS_METADATA 0x0001 651 #define EXT4_FREE_BLOCKS_FORGET 0x0002 652 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 653 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 654 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 655 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 656 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040 657 658 /* 659 * ioctl commands 660 */ 661 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 662 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 663 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 664 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 665 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 666 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 667 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 668 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 669 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 670 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 671 #define EXT4_IOC_MIGRATE _IO('f', 9) 672 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 673 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 674 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 675 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 676 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 677 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 678 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 679 #define EXT4_IOC_SET_ENCRYPTION_POLICY FS_IOC_SET_ENCRYPTION_POLICY 680 #define EXT4_IOC_GET_ENCRYPTION_PWSALT FS_IOC_GET_ENCRYPTION_PWSALT 681 #define EXT4_IOC_GET_ENCRYPTION_POLICY FS_IOC_GET_ENCRYPTION_POLICY 682 /* ioctl codes 19--39 are reserved for fscrypt */ 683 #define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40) 684 #define EXT4_IOC_GETSTATE _IOW('f', 41, __u32) 685 #define EXT4_IOC_GET_ES_CACHE _IOWR('f', 42, struct fiemap) 686 687 #define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR 688 #define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR 689 690 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32) 691 692 /* 693 * Flags for going down operation 694 */ 695 #define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */ 696 #define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */ 697 #define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */ 698 699 /* 700 * Flags returned by EXT4_IOC_GETSTATE 701 * 702 * We only expose to userspace a subset of the state flags in 703 * i_state_flags 704 */ 705 #define EXT4_STATE_FLAG_EXT_PRECACHED 0x00000001 706 #define EXT4_STATE_FLAG_NEW 0x00000002 707 #define EXT4_STATE_FLAG_NEWENTRY 0x00000004 708 #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE 0x00000008 709 710 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 711 /* 712 * ioctl commands in 32 bit emulation 713 */ 714 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 715 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 716 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 717 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 718 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 719 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 720 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 721 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 722 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 723 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 724 #endif 725 726 /* 727 * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag. 728 * It indicates that the entry in extent status cache is for a hole. 729 */ 730 #define EXT4_FIEMAP_EXTENT_HOLE 0x08000000 731 732 /* Max physical block we can address w/o extents */ 733 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 734 735 /* Max logical block we can support */ 736 #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFF 737 738 /* 739 * Structure of an inode on the disk 740 */ 741 struct ext4_inode { 742 __le16 i_mode; /* File mode */ 743 __le16 i_uid; /* Low 16 bits of Owner Uid */ 744 __le32 i_size_lo; /* Size in bytes */ 745 __le32 i_atime; /* Access time */ 746 __le32 i_ctime; /* Inode Change time */ 747 __le32 i_mtime; /* Modification time */ 748 __le32 i_dtime; /* Deletion Time */ 749 __le16 i_gid; /* Low 16 bits of Group Id */ 750 __le16 i_links_count; /* Links count */ 751 __le32 i_blocks_lo; /* Blocks count */ 752 __le32 i_flags; /* File flags */ 753 union { 754 struct { 755 __le32 l_i_version; 756 } linux1; 757 struct { 758 __u32 h_i_translator; 759 } hurd1; 760 struct { 761 __u32 m_i_reserved1; 762 } masix1; 763 } osd1; /* OS dependent 1 */ 764 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 765 __le32 i_generation; /* File version (for NFS) */ 766 __le32 i_file_acl_lo; /* File ACL */ 767 __le32 i_size_high; 768 __le32 i_obso_faddr; /* Obsoleted fragment address */ 769 union { 770 struct { 771 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 772 __le16 l_i_file_acl_high; 773 __le16 l_i_uid_high; /* these 2 fields */ 774 __le16 l_i_gid_high; /* were reserved2[0] */ 775 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 776 __le16 l_i_reserved; 777 } linux2; 778 struct { 779 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 780 __u16 h_i_mode_high; 781 __u16 h_i_uid_high; 782 __u16 h_i_gid_high; 783 __u32 h_i_author; 784 } hurd2; 785 struct { 786 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 787 __le16 m_i_file_acl_high; 788 __u32 m_i_reserved2[2]; 789 } masix2; 790 } osd2; /* OS dependent 2 */ 791 __le16 i_extra_isize; 792 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 793 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 794 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 795 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 796 __le32 i_crtime; /* File Creation time */ 797 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 798 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 799 __le32 i_projid; /* Project ID */ 800 }; 801 802 struct move_extent { 803 __u32 reserved; /* should be zero */ 804 __u32 donor_fd; /* donor file descriptor */ 805 __u64 orig_start; /* logical start offset in block for orig */ 806 __u64 donor_start; /* logical start offset in block for donor */ 807 __u64 len; /* block length to be moved */ 808 __u64 moved_len; /* moved block length */ 809 }; 810 811 #define EXT4_EPOCH_BITS 2 812 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 813 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 814 815 /* 816 * Extended fields will fit into an inode if the filesystem was formatted 817 * with large inodes (-I 256 or larger) and there are not currently any EAs 818 * consuming all of the available space. For new inodes we always reserve 819 * enough space for the kernel's known extended fields, but for inodes 820 * created with an old kernel this might not have been the case. None of 821 * the extended inode fields is critical for correct filesystem operation. 822 * This macro checks if a certain field fits in the inode. Note that 823 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 824 */ 825 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 826 ((offsetof(typeof(*ext4_inode), field) + \ 827 sizeof((ext4_inode)->field)) \ 828 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 829 (einode)->i_extra_isize)) \ 830 831 /* 832 * We use an encoding that preserves the times for extra epoch "00": 833 * 834 * extra msb of adjust for signed 835 * epoch 32-bit 32-bit tv_sec to 836 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 837 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 838 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 839 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 840 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 841 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 842 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 843 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 844 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 845 * 846 * Note that previous versions of the kernel on 64-bit systems would 847 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 848 * 1970. e2fsck will correct this, assuming that it is run on the 849 * affected filesystem before 2242. 850 */ 851 852 static inline __le32 ext4_encode_extra_time(struct timespec64 *time) 853 { 854 u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK; 855 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); 856 } 857 858 static inline void ext4_decode_extra_time(struct timespec64 *time, 859 __le32 extra) 860 { 861 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) 862 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 863 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 864 } 865 866 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 867 do { \ 868 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\ 869 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 870 (raw_inode)->xtime ## _extra = \ 871 ext4_encode_extra_time(&(inode)->xtime); \ 872 } \ 873 else \ 874 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX)); \ 875 } while (0) 876 877 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 878 do { \ 879 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 880 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 881 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 882 (raw_inode)->xtime ## _extra = \ 883 ext4_encode_extra_time(&(einode)->xtime); \ 884 } while (0) 885 886 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 887 do { \ 888 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 889 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \ 890 ext4_decode_extra_time(&(inode)->xtime, \ 891 raw_inode->xtime ## _extra); \ 892 } \ 893 else \ 894 (inode)->xtime.tv_nsec = 0; \ 895 } while (0) 896 897 898 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 899 do { \ 900 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 901 (einode)->xtime.tv_sec = \ 902 (signed)le32_to_cpu((raw_inode)->xtime); \ 903 else \ 904 (einode)->xtime.tv_sec = 0; \ 905 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 906 ext4_decode_extra_time(&(einode)->xtime, \ 907 raw_inode->xtime ## _extra); \ 908 else \ 909 (einode)->xtime.tv_nsec = 0; \ 910 } while (0) 911 912 #define i_disk_version osd1.linux1.l_i_version 913 914 #if defined(__KERNEL__) || defined(__linux__) 915 #define i_reserved1 osd1.linux1.l_i_reserved1 916 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 917 #define i_blocks_high osd2.linux2.l_i_blocks_high 918 #define i_uid_low i_uid 919 #define i_gid_low i_gid 920 #define i_uid_high osd2.linux2.l_i_uid_high 921 #define i_gid_high osd2.linux2.l_i_gid_high 922 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 923 924 #elif defined(__GNU__) 925 926 #define i_translator osd1.hurd1.h_i_translator 927 #define i_uid_high osd2.hurd2.h_i_uid_high 928 #define i_gid_high osd2.hurd2.h_i_gid_high 929 #define i_author osd2.hurd2.h_i_author 930 931 #elif defined(__masix__) 932 933 #define i_reserved1 osd1.masix1.m_i_reserved1 934 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 935 #define i_reserved2 osd2.masix2.m_i_reserved2 936 937 #endif /* defined(__KERNEL__) || defined(__linux__) */ 938 939 #include "extents_status.h" 940 941 /* 942 * Lock subclasses for i_data_sem in the ext4_inode_info structure. 943 * 944 * These are needed to avoid lockdep false positives when we need to 945 * allocate blocks to the quota inode during ext4_map_blocks(), while 946 * holding i_data_sem for a normal (non-quota) inode. Since we don't 947 * do quota tracking for the quota inode, this avoids deadlock (as 948 * well as infinite recursion, since it isn't turtles all the way 949 * down...) 950 * 951 * I_DATA_SEM_NORMAL - Used for most inodes 952 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode 953 * where the second inode has larger inode number 954 * than the first 955 * I_DATA_SEM_QUOTA - Used for quota inodes only 956 */ 957 enum { 958 I_DATA_SEM_NORMAL = 0, 959 I_DATA_SEM_OTHER, 960 I_DATA_SEM_QUOTA, 961 }; 962 963 964 /* 965 * fourth extended file system inode data in memory 966 */ 967 struct ext4_inode_info { 968 __le32 i_data[15]; /* unconverted */ 969 __u32 i_dtime; 970 ext4_fsblk_t i_file_acl; 971 972 /* 973 * i_block_group is the number of the block group which contains 974 * this file's inode. Constant across the lifetime of the inode, 975 * it is used for making block allocation decisions - we try to 976 * place a file's data blocks near its inode block, and new inodes 977 * near to their parent directory's inode. 978 */ 979 ext4_group_t i_block_group; 980 ext4_lblk_t i_dir_start_lookup; 981 #if (BITS_PER_LONG < 64) 982 unsigned long i_state_flags; /* Dynamic state flags */ 983 #endif 984 unsigned long i_flags; 985 986 /* 987 * Extended attributes can be read independently of the main file 988 * data. Taking i_mutex even when reading would cause contention 989 * between readers of EAs and writers of regular file data, so 990 * instead we synchronize on xattr_sem when reading or changing 991 * EAs. 992 */ 993 struct rw_semaphore xattr_sem; 994 995 struct list_head i_orphan; /* unlinked but open inodes */ 996 997 /* 998 * i_disksize keeps track of what the inode size is ON DISK, not 999 * in memory. During truncate, i_size is set to the new size by 1000 * the VFS prior to calling ext4_truncate(), but the filesystem won't 1001 * set i_disksize to 0 until the truncate is actually under way. 1002 * 1003 * The intent is that i_disksize always represents the blocks which 1004 * are used by this file. This allows recovery to restart truncate 1005 * on orphans if we crash during truncate. We actually write i_disksize 1006 * into the on-disk inode when writing inodes out, instead of i_size. 1007 * 1008 * The only time when i_disksize and i_size may be different is when 1009 * a truncate is in progress. The only things which change i_disksize 1010 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 1011 */ 1012 loff_t i_disksize; 1013 1014 /* 1015 * i_data_sem is for serialising ext4_truncate() against 1016 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 1017 * data tree are chopped off during truncate. We can't do that in 1018 * ext4 because whenever we perform intermediate commits during 1019 * truncate, the inode and all the metadata blocks *must* be in a 1020 * consistent state which allows truncation of the orphans to restart 1021 * during recovery. Hence we must fix the get_block-vs-truncate race 1022 * by other means, so we have i_data_sem. 1023 */ 1024 struct rw_semaphore i_data_sem; 1025 /* 1026 * i_mmap_sem is for serializing page faults with truncate / punch hole 1027 * operations. We have to make sure that new page cannot be faulted in 1028 * a section of the inode that is being punched. We cannot easily use 1029 * i_data_sem for this since we need protection for the whole punch 1030 * operation and i_data_sem ranks below transaction start so we have 1031 * to occasionally drop it. 1032 */ 1033 struct rw_semaphore i_mmap_sem; 1034 struct inode vfs_inode; 1035 struct jbd2_inode *jinode; 1036 1037 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 1038 1039 /* 1040 * File creation time. Its function is same as that of 1041 * struct timespec64 i_{a,c,m}time in the generic inode. 1042 */ 1043 struct timespec64 i_crtime; 1044 1045 /* mballoc */ 1046 struct list_head i_prealloc_list; 1047 spinlock_t i_prealloc_lock; 1048 1049 /* extents status tree */ 1050 struct ext4_es_tree i_es_tree; 1051 rwlock_t i_es_lock; 1052 struct list_head i_es_list; 1053 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1054 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1055 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1056 extents to shrink. Protected by 1057 i_es_lock */ 1058 1059 /* ialloc */ 1060 ext4_group_t i_last_alloc_group; 1061 1062 /* allocation reservation info for delalloc */ 1063 /* In case of bigalloc, this refer to clusters rather than blocks */ 1064 unsigned int i_reserved_data_blocks; 1065 1066 /* pending cluster reservations for bigalloc file systems */ 1067 struct ext4_pending_tree i_pending_tree; 1068 1069 /* on-disk additional length */ 1070 __u16 i_extra_isize; 1071 1072 /* Indicate the inline data space. */ 1073 u16 i_inline_off; 1074 u16 i_inline_size; 1075 1076 #ifdef CONFIG_QUOTA 1077 /* quota space reservation, managed internally by quota code */ 1078 qsize_t i_reserved_quota; 1079 #endif 1080 1081 /* Lock protecting lists below */ 1082 spinlock_t i_completed_io_lock; 1083 /* 1084 * Completed IOs that need unwritten extents handling and have 1085 * transaction reserved 1086 */ 1087 struct list_head i_rsv_conversion_list; 1088 struct work_struct i_rsv_conversion_work; 1089 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 1090 1091 spinlock_t i_block_reservation_lock; 1092 1093 /* 1094 * Transactions that contain inode's metadata needed to complete 1095 * fsync and fdatasync, respectively. 1096 */ 1097 tid_t i_sync_tid; 1098 tid_t i_datasync_tid; 1099 1100 #ifdef CONFIG_QUOTA 1101 struct dquot *i_dquot[MAXQUOTAS]; 1102 #endif 1103 1104 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1105 __u32 i_csum_seed; 1106 1107 kprojid_t i_projid; 1108 }; 1109 1110 /* 1111 * File system states 1112 */ 1113 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1114 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1115 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1116 1117 /* 1118 * Misc. filesystem flags 1119 */ 1120 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1121 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1122 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1123 1124 /* 1125 * Mount flags set via mount options or defaults 1126 */ 1127 #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */ 1128 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1129 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1130 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1131 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1132 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1133 #define EXT4_MOUNT_ERRORS_MASK 0x00070 1134 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1135 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1136 #ifdef CONFIG_FS_DAX 1137 #define EXT4_MOUNT_DAX 0x00200 /* Direct Access */ 1138 #else 1139 #define EXT4_MOUNT_DAX 0 1140 #endif 1141 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1142 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1143 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1144 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1145 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1146 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1147 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1148 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1149 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1150 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1151 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */ 1152 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota, 1153 * enable enforcement for hidden 1154 * quota files */ 1155 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable 1156 * enforcement for hidden quota 1157 * files */ 1158 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota 1159 * enforcement */ 1160 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1161 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1162 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1163 #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */ 1164 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1165 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1166 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1167 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1168 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1169 1170 /* 1171 * Mount flags set either automatically (could not be set by mount option) 1172 * based on per file system feature or property or in special cases such as 1173 * distinguishing between explicit mount option definition and default. 1174 */ 1175 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1176 specified delalloc */ 1177 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1178 size of blocksize * 8 1179 blocks */ 1180 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1181 file systems */ 1182 1183 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1184 specified journal checksum */ 1185 1186 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1187 ~EXT4_MOUNT_##opt 1188 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1189 EXT4_MOUNT_##opt 1190 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1191 EXT4_MOUNT_##opt) 1192 1193 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1194 ~EXT4_MOUNT2_##opt 1195 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1196 EXT4_MOUNT2_##opt 1197 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1198 EXT4_MOUNT2_##opt) 1199 1200 #define ext4_test_and_set_bit __test_and_set_bit_le 1201 #define ext4_set_bit __set_bit_le 1202 #define ext4_set_bit_atomic ext2_set_bit_atomic 1203 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1204 #define ext4_clear_bit __clear_bit_le 1205 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1206 #define ext4_test_bit test_bit_le 1207 #define ext4_find_next_zero_bit find_next_zero_bit_le 1208 #define ext4_find_next_bit find_next_bit_le 1209 1210 extern void ext4_set_bits(void *bm, int cur, int len); 1211 1212 /* 1213 * Maximal mount counts between two filesystem checks 1214 */ 1215 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1216 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1217 1218 /* 1219 * Behaviour when detecting errors 1220 */ 1221 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1222 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1223 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1224 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1225 1226 /* Metadata checksum algorithm codes */ 1227 #define EXT4_CRC32C_CHKSUM 1 1228 1229 /* 1230 * Structure of the super block 1231 */ 1232 struct ext4_super_block { 1233 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1234 __le32 s_blocks_count_lo; /* Blocks count */ 1235 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1236 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1237 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1238 __le32 s_first_data_block; /* First Data Block */ 1239 __le32 s_log_block_size; /* Block size */ 1240 __le32 s_log_cluster_size; /* Allocation cluster size */ 1241 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1242 __le32 s_clusters_per_group; /* # Clusters per group */ 1243 __le32 s_inodes_per_group; /* # Inodes per group */ 1244 __le32 s_mtime; /* Mount time */ 1245 /*30*/ __le32 s_wtime; /* Write time */ 1246 __le16 s_mnt_count; /* Mount count */ 1247 __le16 s_max_mnt_count; /* Maximal mount count */ 1248 __le16 s_magic; /* Magic signature */ 1249 __le16 s_state; /* File system state */ 1250 __le16 s_errors; /* Behaviour when detecting errors */ 1251 __le16 s_minor_rev_level; /* minor revision level */ 1252 /*40*/ __le32 s_lastcheck; /* time of last check */ 1253 __le32 s_checkinterval; /* max. time between checks */ 1254 __le32 s_creator_os; /* OS */ 1255 __le32 s_rev_level; /* Revision level */ 1256 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1257 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1258 /* 1259 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1260 * 1261 * Note: the difference between the compatible feature set and 1262 * the incompatible feature set is that if there is a bit set 1263 * in the incompatible feature set that the kernel doesn't 1264 * know about, it should refuse to mount the filesystem. 1265 * 1266 * e2fsck's requirements are more strict; if it doesn't know 1267 * about a feature in either the compatible or incompatible 1268 * feature set, it must abort and not try to meddle with 1269 * things it doesn't understand... 1270 */ 1271 __le32 s_first_ino; /* First non-reserved inode */ 1272 __le16 s_inode_size; /* size of inode structure */ 1273 __le16 s_block_group_nr; /* block group # of this superblock */ 1274 __le32 s_feature_compat; /* compatible feature set */ 1275 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1276 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1277 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1278 /*78*/ char s_volume_name[16]; /* volume name */ 1279 /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */ 1280 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1281 /* 1282 * Performance hints. Directory preallocation should only 1283 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1284 */ 1285 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1286 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1287 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1288 /* 1289 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1290 */ 1291 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1292 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1293 __le32 s_journal_dev; /* device number of journal file */ 1294 __le32 s_last_orphan; /* start of list of inodes to delete */ 1295 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1296 __u8 s_def_hash_version; /* Default hash version to use */ 1297 __u8 s_jnl_backup_type; 1298 __le16 s_desc_size; /* size of group descriptor */ 1299 /*100*/ __le32 s_default_mount_opts; 1300 __le32 s_first_meta_bg; /* First metablock block group */ 1301 __le32 s_mkfs_time; /* When the filesystem was created */ 1302 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1303 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1304 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1305 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1306 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1307 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1308 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1309 __le32 s_flags; /* Miscellaneous flags */ 1310 __le16 s_raid_stride; /* RAID stride */ 1311 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1312 __le64 s_mmp_block; /* Block for multi-mount protection */ 1313 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1314 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1315 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1316 __u8 s_encryption_level; /* versioning level for encryption */ 1317 __u8 s_reserved_pad; /* Padding to next 32bits */ 1318 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1319 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1320 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1321 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1322 snapshot's future use */ 1323 __le32 s_snapshot_list; /* inode number of the head of the 1324 on-disk snapshot list */ 1325 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1326 __le32 s_error_count; /* number of fs errors */ 1327 __le32 s_first_error_time; /* first time an error happened */ 1328 __le32 s_first_error_ino; /* inode involved in first error */ 1329 __le64 s_first_error_block; /* block involved of first error */ 1330 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */ 1331 __le32 s_first_error_line; /* line number where error happened */ 1332 __le32 s_last_error_time; /* most recent time of an error */ 1333 __le32 s_last_error_ino; /* inode involved in last error */ 1334 __le32 s_last_error_line; /* line number where error happened */ 1335 __le64 s_last_error_block; /* block involved of last error */ 1336 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */ 1337 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1338 __u8 s_mount_opts[64]; 1339 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1340 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1341 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1342 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1343 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1344 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1345 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1346 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1347 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1348 __u8 s_wtime_hi; 1349 __u8 s_mtime_hi; 1350 __u8 s_mkfs_time_hi; 1351 __u8 s_lastcheck_hi; 1352 __u8 s_first_error_time_hi; 1353 __u8 s_last_error_time_hi; 1354 __u8 s_first_error_errcode; 1355 __u8 s_last_error_errcode; 1356 __le16 s_encoding; /* Filename charset encoding */ 1357 __le16 s_encoding_flags; /* Filename charset encoding flags */ 1358 __le32 s_reserved[95]; /* Padding to the end of the block */ 1359 __le32 s_checksum; /* crc32c(superblock) */ 1360 }; 1361 1362 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1363 1364 #ifdef __KERNEL__ 1365 1366 /* 1367 * run-time mount flags 1368 */ 1369 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1370 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1371 #define EXT4_MF_TEST_DUMMY_ENCRYPTION 0x0004 1372 1373 #ifdef CONFIG_FS_ENCRYPTION 1374 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \ 1375 EXT4_MF_TEST_DUMMY_ENCRYPTION)) 1376 #else 1377 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0) 1378 #endif 1379 1380 /* Number of quota types we support */ 1381 #define EXT4_MAXQUOTAS 3 1382 1383 #define EXT4_ENC_UTF8_12_1 1 1384 1385 /* 1386 * Flags for ext4_sb_info.s_encoding_flags. 1387 */ 1388 #define EXT4_ENC_STRICT_MODE_FL (1 << 0) 1389 1390 #define ext4_has_strict_mode(sbi) \ 1391 (sbi->s_encoding_flags & EXT4_ENC_STRICT_MODE_FL) 1392 1393 /* 1394 * fourth extended-fs super-block data in memory 1395 */ 1396 struct ext4_sb_info { 1397 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1398 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1399 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1400 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1401 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1402 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1403 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1404 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1405 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1406 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1407 unsigned long s_overhead; /* # of fs overhead clusters */ 1408 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1409 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1410 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1411 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1412 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1413 struct buffer_head * __rcu *s_group_desc; 1414 unsigned int s_mount_opt; 1415 unsigned int s_mount_opt2; 1416 unsigned int s_mount_flags; 1417 unsigned int s_def_mount_opt; 1418 ext4_fsblk_t s_sb_block; 1419 atomic64_t s_resv_clusters; 1420 kuid_t s_resuid; 1421 kgid_t s_resgid; 1422 unsigned short s_mount_state; 1423 unsigned short s_pad; 1424 int s_addr_per_block_bits; 1425 int s_desc_per_block_bits; 1426 int s_inode_size; 1427 int s_first_ino; 1428 unsigned int s_inode_readahead_blks; 1429 unsigned int s_inode_goal; 1430 u32 s_hash_seed[4]; 1431 int s_def_hash_version; 1432 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1433 struct percpu_counter s_freeclusters_counter; 1434 struct percpu_counter s_freeinodes_counter; 1435 struct percpu_counter s_dirs_counter; 1436 struct percpu_counter s_dirtyclusters_counter; 1437 struct blockgroup_lock *s_blockgroup_lock; 1438 struct proc_dir_entry *s_proc; 1439 struct kobject s_kobj; 1440 struct completion s_kobj_unregister; 1441 struct super_block *s_sb; 1442 #ifdef CONFIG_UNICODE 1443 struct unicode_map *s_encoding; 1444 __u16 s_encoding_flags; 1445 #endif 1446 1447 /* Journaling */ 1448 struct journal_s *s_journal; 1449 struct list_head s_orphan; 1450 struct mutex s_orphan_lock; 1451 unsigned long s_ext4_flags; /* Ext4 superblock flags */ 1452 unsigned long s_commit_interval; 1453 u32 s_max_batch_time; 1454 u32 s_min_batch_time; 1455 struct block_device *journal_bdev; 1456 #ifdef CONFIG_QUOTA 1457 /* Names of quota files with journalled quota */ 1458 char __rcu *s_qf_names[EXT4_MAXQUOTAS]; 1459 int s_jquota_fmt; /* Format of quota to use */ 1460 #endif 1461 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1462 struct ext4_system_blocks __rcu *system_blks; 1463 1464 #ifdef EXTENTS_STATS 1465 /* ext4 extents stats */ 1466 unsigned long s_ext_min; 1467 unsigned long s_ext_max; 1468 unsigned long s_depth_max; 1469 spinlock_t s_ext_stats_lock; 1470 unsigned long s_ext_blocks; 1471 unsigned long s_ext_extents; 1472 #endif 1473 1474 /* for buddy allocator */ 1475 struct ext4_group_info ** __rcu *s_group_info; 1476 struct inode *s_buddy_cache; 1477 spinlock_t s_md_lock; 1478 unsigned short *s_mb_offsets; 1479 unsigned int *s_mb_maxs; 1480 unsigned int s_group_info_size; 1481 unsigned int s_mb_free_pending; 1482 struct list_head s_freed_data_list; /* List of blocks to be freed 1483 after commit completed */ 1484 1485 /* tunables */ 1486 unsigned long s_stripe; 1487 unsigned int s_mb_stream_request; 1488 unsigned int s_mb_max_to_scan; 1489 unsigned int s_mb_min_to_scan; 1490 unsigned int s_mb_stats; 1491 unsigned int s_mb_order2_reqs; 1492 unsigned int s_mb_group_prealloc; 1493 unsigned int s_max_dir_size_kb; 1494 /* where last allocation was done - for stream allocation */ 1495 unsigned long s_mb_last_group; 1496 unsigned long s_mb_last_start; 1497 1498 /* stats for buddy allocator */ 1499 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1500 atomic_t s_bal_success; /* we found long enough chunks */ 1501 atomic_t s_bal_allocated; /* in blocks */ 1502 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1503 atomic_t s_bal_goals; /* goal hits */ 1504 atomic_t s_bal_breaks; /* too long searches */ 1505 atomic_t s_bal_2orders; /* 2^order hits */ 1506 spinlock_t s_bal_lock; 1507 unsigned long s_mb_buddies_generated; 1508 unsigned long long s_mb_generation_time; 1509 atomic_t s_mb_lost_chunks; 1510 atomic_t s_mb_preallocated; 1511 atomic_t s_mb_discarded; 1512 atomic_t s_lock_busy; 1513 1514 /* locality groups */ 1515 struct ext4_locality_group __percpu *s_locality_groups; 1516 1517 /* for write statistics */ 1518 unsigned long s_sectors_written_start; 1519 u64 s_kbytes_written; 1520 1521 /* the size of zero-out chunk */ 1522 unsigned int s_extent_max_zeroout_kb; 1523 1524 unsigned int s_log_groups_per_flex; 1525 struct flex_groups * __rcu *s_flex_groups; 1526 ext4_group_t s_flex_groups_allocated; 1527 1528 /* workqueue for reserved extent conversions (buffered io) */ 1529 struct workqueue_struct *rsv_conversion_wq; 1530 1531 /* timer for periodic error stats printing */ 1532 struct timer_list s_err_report; 1533 1534 /* Lazy inode table initialization info */ 1535 struct ext4_li_request *s_li_request; 1536 /* Wait multiplier for lazy initialization thread */ 1537 unsigned int s_li_wait_mult; 1538 1539 /* Kernel thread for multiple mount protection */ 1540 struct task_struct *s_mmp_tsk; 1541 1542 /* record the last minlen when FITRIM is called. */ 1543 atomic_t s_last_trim_minblks; 1544 1545 /* Reference to checksum algorithm driver via cryptoapi */ 1546 struct crypto_shash *s_chksum_driver; 1547 1548 /* Precomputed FS UUID checksum for seeding other checksums */ 1549 __u32 s_csum_seed; 1550 1551 /* Reclaim extents from extent status tree */ 1552 struct shrinker s_es_shrinker; 1553 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1554 long s_es_nr_inode; 1555 struct ext4_es_stats s_es_stats; 1556 struct mb_cache *s_ea_block_cache; 1557 struct mb_cache *s_ea_inode_cache; 1558 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1559 1560 /* Ratelimit ext4 messages. */ 1561 struct ratelimit_state s_err_ratelimit_state; 1562 struct ratelimit_state s_warning_ratelimit_state; 1563 struct ratelimit_state s_msg_ratelimit_state; 1564 1565 /* 1566 * Barrier between writepages ops and changing any inode's JOURNAL_DATA 1567 * or EXTENTS flag. 1568 */ 1569 struct percpu_rw_semaphore s_writepages_rwsem; 1570 struct dax_device *s_daxdev; 1571 #ifdef CONFIG_EXT4_DEBUG 1572 unsigned long s_simulate_fail; 1573 #endif 1574 }; 1575 1576 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1577 { 1578 return sb->s_fs_info; 1579 } 1580 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1581 { 1582 return container_of(inode, struct ext4_inode_info, vfs_inode); 1583 } 1584 1585 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1586 { 1587 return ino == EXT4_ROOT_INO || 1588 (ino >= EXT4_FIRST_INO(sb) && 1589 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1590 } 1591 1592 /* 1593 * Returns: sbi->field[index] 1594 * Used to access an array element from the following sbi fields which require 1595 * rcu protection to avoid dereferencing an invalid pointer due to reassignment 1596 * - s_group_desc 1597 * - s_group_info 1598 * - s_flex_group 1599 */ 1600 #define sbi_array_rcu_deref(sbi, field, index) \ 1601 ({ \ 1602 typeof(*((sbi)->field)) _v; \ 1603 rcu_read_lock(); \ 1604 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \ 1605 rcu_read_unlock(); \ 1606 _v; \ 1607 }) 1608 1609 /* 1610 * Simulate_fail codes 1611 */ 1612 #define EXT4_SIM_BBITMAP_EIO 1 1613 #define EXT4_SIM_BBITMAP_CRC 2 1614 #define EXT4_SIM_IBITMAP_EIO 3 1615 #define EXT4_SIM_IBITMAP_CRC 4 1616 #define EXT4_SIM_INODE_EIO 5 1617 #define EXT4_SIM_INODE_CRC 6 1618 #define EXT4_SIM_DIRBLOCK_EIO 7 1619 #define EXT4_SIM_DIRBLOCK_CRC 8 1620 1621 static inline bool ext4_simulate_fail(struct super_block *sb, 1622 unsigned long code) 1623 { 1624 #ifdef CONFIG_EXT4_DEBUG 1625 struct ext4_sb_info *sbi = EXT4_SB(sb); 1626 1627 if (unlikely(sbi->s_simulate_fail == code)) { 1628 sbi->s_simulate_fail = 0; 1629 return true; 1630 } 1631 #endif 1632 return false; 1633 } 1634 1635 static inline void ext4_simulate_fail_bh(struct super_block *sb, 1636 struct buffer_head *bh, 1637 unsigned long code) 1638 { 1639 if (!IS_ERR(bh) && ext4_simulate_fail(sb, code)) 1640 clear_buffer_uptodate(bh); 1641 } 1642 1643 /* 1644 * Error number codes for s_{first,last}_error_errno 1645 * 1646 * Linux errno numbers are architecture specific, so we need to translate 1647 * them into something which is architecture independent. We don't define 1648 * codes for all errno's; just the ones which are most likely to be the cause 1649 * of an ext4_error() call. 1650 */ 1651 #define EXT4_ERR_UNKNOWN 1 1652 #define EXT4_ERR_EIO 2 1653 #define EXT4_ERR_ENOMEM 3 1654 #define EXT4_ERR_EFSBADCRC 4 1655 #define EXT4_ERR_EFSCORRUPTED 5 1656 #define EXT4_ERR_ENOSPC 6 1657 #define EXT4_ERR_ENOKEY 7 1658 #define EXT4_ERR_EROFS 8 1659 #define EXT4_ERR_EFBIG 9 1660 #define EXT4_ERR_EEXIST 10 1661 #define EXT4_ERR_ERANGE 11 1662 #define EXT4_ERR_EOVERFLOW 12 1663 #define EXT4_ERR_EBUSY 13 1664 #define EXT4_ERR_ENOTDIR 14 1665 #define EXT4_ERR_ENOTEMPTY 15 1666 #define EXT4_ERR_ESHUTDOWN 16 1667 #define EXT4_ERR_EFAULT 17 1668 1669 /* 1670 * Inode dynamic state flags 1671 */ 1672 enum { 1673 EXT4_STATE_JDATA, /* journaled data exists */ 1674 EXT4_STATE_NEW, /* inode is newly created */ 1675 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1676 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1677 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1678 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1679 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1680 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1681 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1682 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */ 1683 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */ 1684 }; 1685 1686 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1687 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1688 { \ 1689 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1690 } \ 1691 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1692 { \ 1693 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1694 } \ 1695 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1696 { \ 1697 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1698 } 1699 1700 /* Add these declarations here only so that these functions can be 1701 * found by name. Otherwise, they are very hard to locate. */ 1702 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1703 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1704 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1705 EXT4_INODE_BIT_FNS(flag, flags, 0) 1706 1707 /* Add these declarations here only so that these functions can be 1708 * found by name. Otherwise, they are very hard to locate. */ 1709 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1710 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1711 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1712 #if (BITS_PER_LONG < 64) 1713 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1714 1715 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1716 { 1717 (ei)->i_state_flags = 0; 1718 } 1719 #else 1720 EXT4_INODE_BIT_FNS(state, flags, 32) 1721 1722 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1723 { 1724 /* We depend on the fact that callers will set i_flags */ 1725 } 1726 #endif 1727 #else 1728 /* Assume that user mode programs are passing in an ext4fs superblock, not 1729 * a kernel struct super_block. This will allow us to call the feature-test 1730 * macros from user land. */ 1731 #define EXT4_SB(sb) (sb) 1732 #endif 1733 1734 static inline bool ext4_verity_in_progress(struct inode *inode) 1735 { 1736 return IS_ENABLED(CONFIG_FS_VERITY) && 1737 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS); 1738 } 1739 1740 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1741 1742 /* 1743 * Codes for operating systems 1744 */ 1745 #define EXT4_OS_LINUX 0 1746 #define EXT4_OS_HURD 1 1747 #define EXT4_OS_MASIX 2 1748 #define EXT4_OS_FREEBSD 3 1749 #define EXT4_OS_LITES 4 1750 1751 /* 1752 * Revision levels 1753 */ 1754 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1755 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1756 1757 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1758 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1759 1760 #define EXT4_GOOD_OLD_INODE_SIZE 128 1761 1762 #define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN) 1763 #define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX 1764 #define EXT4_TIMESTAMP_MIN S32_MIN 1765 1766 /* 1767 * Feature set definitions 1768 */ 1769 1770 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1771 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1772 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1773 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1774 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1775 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1776 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1777 #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800 1778 1779 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1780 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1781 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1782 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1783 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1784 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1785 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1786 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1787 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1788 /* 1789 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1790 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1791 * all other data structures' checksums. However, the METADATA_CSUM and 1792 * GDT_CSUM bits are mutually exclusive. 1793 */ 1794 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1795 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1796 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 1797 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000 1798 1799 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1800 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1801 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1802 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1803 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1804 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1805 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1806 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1807 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1808 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1809 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1810 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 1811 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1812 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1813 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1814 #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000 1815 1816 extern void ext4_update_dynamic_rev(struct super_block *sb); 1817 1818 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 1819 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1820 { \ 1821 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1822 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 1823 } \ 1824 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1825 { \ 1826 ext4_update_dynamic_rev(sb); \ 1827 EXT4_SB(sb)->s_es->s_feature_compat |= \ 1828 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1829 } \ 1830 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1831 { \ 1832 EXT4_SB(sb)->s_es->s_feature_compat &= \ 1833 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1834 } 1835 1836 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 1837 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1838 { \ 1839 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1840 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 1841 } \ 1842 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1843 { \ 1844 ext4_update_dynamic_rev(sb); \ 1845 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 1846 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1847 } \ 1848 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1849 { \ 1850 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 1851 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1852 } 1853 1854 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 1855 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1856 { \ 1857 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1858 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 1859 } \ 1860 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1861 { \ 1862 ext4_update_dynamic_rev(sb); \ 1863 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 1864 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1865 } \ 1866 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1867 { \ 1868 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 1869 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1870 } 1871 1872 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 1873 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 1874 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 1875 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 1876 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 1877 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 1878 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 1879 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES) 1880 1881 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 1882 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 1883 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 1884 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 1885 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 1886 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 1887 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 1888 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 1889 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 1890 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 1891 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 1892 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 1893 EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY) 1894 1895 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 1896 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 1897 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 1898 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 1899 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 1900 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 1901 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 1902 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 1903 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 1904 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 1905 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 1906 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 1907 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 1908 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 1909 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 1910 EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD) 1911 1912 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1913 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1914 EXT4_FEATURE_INCOMPAT_META_BG) 1915 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1916 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1917 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1918 1919 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1920 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1921 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1922 EXT4_FEATURE_INCOMPAT_META_BG) 1923 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1924 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1925 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1926 1927 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1928 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1929 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1930 EXT4_FEATURE_INCOMPAT_META_BG| \ 1931 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1932 EXT4_FEATURE_INCOMPAT_64BIT| \ 1933 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1934 EXT4_FEATURE_INCOMPAT_EA_INODE| \ 1935 EXT4_FEATURE_INCOMPAT_MMP | \ 1936 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 1937 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 1938 EXT4_FEATURE_INCOMPAT_CASEFOLD | \ 1939 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \ 1940 EXT4_FEATURE_INCOMPAT_LARGEDIR) 1941 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1942 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1943 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1944 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1945 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1946 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1947 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1948 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1949 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1950 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 1951 EXT4_FEATURE_RO_COMPAT_PROJECT |\ 1952 EXT4_FEATURE_RO_COMPAT_VERITY) 1953 1954 #define EXTN_FEATURE_FUNCS(ver) \ 1955 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 1956 { \ 1957 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1958 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 1959 } \ 1960 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 1961 { \ 1962 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1963 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 1964 } \ 1965 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 1966 { \ 1967 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1968 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 1969 } 1970 1971 EXTN_FEATURE_FUNCS(2) 1972 EXTN_FEATURE_FUNCS(3) 1973 EXTN_FEATURE_FUNCS(4) 1974 1975 static inline bool ext4_has_compat_features(struct super_block *sb) 1976 { 1977 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 1978 } 1979 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 1980 { 1981 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 1982 } 1983 static inline bool ext4_has_incompat_features(struct super_block *sb) 1984 { 1985 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 1986 } 1987 1988 /* 1989 * Superblock flags 1990 */ 1991 #define EXT4_FLAGS_RESIZING 0 1992 #define EXT4_FLAGS_SHUTDOWN 1 1993 1994 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi) 1995 { 1996 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 1997 } 1998 1999 2000 /* 2001 * Default values for user and/or group using reserved blocks 2002 */ 2003 #define EXT4_DEF_RESUID 0 2004 #define EXT4_DEF_RESGID 0 2005 2006 /* 2007 * Default project ID 2008 */ 2009 #define EXT4_DEF_PROJID 0 2010 2011 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 2012 2013 /* 2014 * Default mount options 2015 */ 2016 #define EXT4_DEFM_DEBUG 0x0001 2017 #define EXT4_DEFM_BSDGROUPS 0x0002 2018 #define EXT4_DEFM_XATTR_USER 0x0004 2019 #define EXT4_DEFM_ACL 0x0008 2020 #define EXT4_DEFM_UID16 0x0010 2021 #define EXT4_DEFM_JMODE 0x0060 2022 #define EXT4_DEFM_JMODE_DATA 0x0020 2023 #define EXT4_DEFM_JMODE_ORDERED 0x0040 2024 #define EXT4_DEFM_JMODE_WBACK 0x0060 2025 #define EXT4_DEFM_NOBARRIER 0x0100 2026 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 2027 #define EXT4_DEFM_DISCARD 0x0400 2028 #define EXT4_DEFM_NODELALLOC 0x0800 2029 2030 /* 2031 * Default journal batch times 2032 */ 2033 #define EXT4_DEF_MIN_BATCH_TIME 0 2034 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 2035 2036 /* 2037 * Minimum number of groups in a flexgroup before we separate out 2038 * directories into the first block group of a flexgroup 2039 */ 2040 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 2041 2042 /* 2043 * Structure of a directory entry 2044 */ 2045 #define EXT4_NAME_LEN 255 2046 2047 struct ext4_dir_entry { 2048 __le32 inode; /* Inode number */ 2049 __le16 rec_len; /* Directory entry length */ 2050 __le16 name_len; /* Name length */ 2051 char name[EXT4_NAME_LEN]; /* File name */ 2052 }; 2053 2054 /* 2055 * The new version of the directory entry. Since EXT4 structures are 2056 * stored in intel byte order, and the name_len field could never be 2057 * bigger than 255 chars, it's safe to reclaim the extra byte for the 2058 * file_type field. 2059 */ 2060 struct ext4_dir_entry_2 { 2061 __le32 inode; /* Inode number */ 2062 __le16 rec_len; /* Directory entry length */ 2063 __u8 name_len; /* Name length */ 2064 __u8 file_type; /* See file type macros EXT4_FT_* below */ 2065 char name[EXT4_NAME_LEN]; /* File name */ 2066 }; 2067 2068 /* 2069 * This is a bogus directory entry at the end of each leaf block that 2070 * records checksums. 2071 */ 2072 struct ext4_dir_entry_tail { 2073 __le32 det_reserved_zero1; /* Pretend to be unused */ 2074 __le16 det_rec_len; /* 12 */ 2075 __u8 det_reserved_zero2; /* Zero name length */ 2076 __u8 det_reserved_ft; /* 0xDE, fake file type */ 2077 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 2078 }; 2079 2080 #define EXT4_DIRENT_TAIL(block, blocksize) \ 2081 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 2082 ((blocksize) - \ 2083 sizeof(struct ext4_dir_entry_tail)))) 2084 2085 /* 2086 * Ext4 directory file types. Only the low 3 bits are used. The 2087 * other bits are reserved for now. 2088 */ 2089 #define EXT4_FT_UNKNOWN 0 2090 #define EXT4_FT_REG_FILE 1 2091 #define EXT4_FT_DIR 2 2092 #define EXT4_FT_CHRDEV 3 2093 #define EXT4_FT_BLKDEV 4 2094 #define EXT4_FT_FIFO 5 2095 #define EXT4_FT_SOCK 6 2096 #define EXT4_FT_SYMLINK 7 2097 2098 #define EXT4_FT_MAX 8 2099 2100 #define EXT4_FT_DIR_CSUM 0xDE 2101 2102 /* 2103 * EXT4_DIR_PAD defines the directory entries boundaries 2104 * 2105 * NOTE: It must be a multiple of 4 2106 */ 2107 #define EXT4_DIR_PAD 4 2108 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 2109 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 2110 ~EXT4_DIR_ROUND) 2111 #define EXT4_MAX_REC_LEN ((1<<16)-1) 2112 2113 /* 2114 * If we ever get support for fs block sizes > page_size, we'll need 2115 * to remove the #if statements in the next two functions... 2116 */ 2117 static inline unsigned int 2118 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 2119 { 2120 unsigned len = le16_to_cpu(dlen); 2121 2122 #if (PAGE_SIZE >= 65536) 2123 if (len == EXT4_MAX_REC_LEN || len == 0) 2124 return blocksize; 2125 return (len & 65532) | ((len & 3) << 16); 2126 #else 2127 return len; 2128 #endif 2129 } 2130 2131 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 2132 { 2133 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 2134 BUG(); 2135 #if (PAGE_SIZE >= 65536) 2136 if (len < 65536) 2137 return cpu_to_le16(len); 2138 if (len == blocksize) { 2139 if (blocksize == 65536) 2140 return cpu_to_le16(EXT4_MAX_REC_LEN); 2141 else 2142 return cpu_to_le16(0); 2143 } 2144 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 2145 #else 2146 return cpu_to_le16(len); 2147 #endif 2148 } 2149 2150 /* 2151 * Hash Tree Directory indexing 2152 * (c) Daniel Phillips, 2001 2153 */ 2154 2155 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2156 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2157 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \ 2158 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir))) 2159 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2160 2161 /* Legal values for the dx_root hash_version field: */ 2162 2163 #define DX_HASH_LEGACY 0 2164 #define DX_HASH_HALF_MD4 1 2165 #define DX_HASH_TEA 2 2166 #define DX_HASH_LEGACY_UNSIGNED 3 2167 #define DX_HASH_HALF_MD4_UNSIGNED 4 2168 #define DX_HASH_TEA_UNSIGNED 5 2169 2170 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 2171 const void *address, unsigned int length) 2172 { 2173 struct { 2174 struct shash_desc shash; 2175 char ctx[4]; 2176 } desc; 2177 2178 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2179 2180 desc.shash.tfm = sbi->s_chksum_driver; 2181 *(u32 *)desc.ctx = crc; 2182 2183 BUG_ON(crypto_shash_update(&desc.shash, address, length)); 2184 2185 return *(u32 *)desc.ctx; 2186 } 2187 2188 #ifdef __KERNEL__ 2189 2190 /* hash info structure used by the directory hash */ 2191 struct dx_hash_info 2192 { 2193 u32 hash; 2194 u32 minor_hash; 2195 int hash_version; 2196 u32 *seed; 2197 }; 2198 2199 2200 /* 32 and 64 bit signed EOF for dx directories */ 2201 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2202 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2203 2204 2205 /* 2206 * Control parameters used by ext4_htree_next_block 2207 */ 2208 #define HASH_NB_ALWAYS 1 2209 2210 struct ext4_filename { 2211 const struct qstr *usr_fname; 2212 struct fscrypt_str disk_name; 2213 struct dx_hash_info hinfo; 2214 #ifdef CONFIG_FS_ENCRYPTION 2215 struct fscrypt_str crypto_buf; 2216 #endif 2217 #ifdef CONFIG_UNICODE 2218 struct fscrypt_str cf_name; 2219 #endif 2220 }; 2221 2222 #define fname_name(p) ((p)->disk_name.name) 2223 #define fname_len(p) ((p)->disk_name.len) 2224 2225 /* 2226 * Describe an inode's exact location on disk and in memory 2227 */ 2228 struct ext4_iloc 2229 { 2230 struct buffer_head *bh; 2231 unsigned long offset; 2232 ext4_group_t block_group; 2233 }; 2234 2235 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2236 { 2237 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2238 } 2239 2240 static inline bool ext4_is_quota_file(struct inode *inode) 2241 { 2242 return IS_NOQUOTA(inode) && 2243 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL); 2244 } 2245 2246 /* 2247 * This structure is stuffed into the struct file's private_data field 2248 * for directories. It is where we put information so that we can do 2249 * readdir operations in hash tree order. 2250 */ 2251 struct dir_private_info { 2252 struct rb_root root; 2253 struct rb_node *curr_node; 2254 struct fname *extra_fname; 2255 loff_t last_pos; 2256 __u32 curr_hash; 2257 __u32 curr_minor_hash; 2258 __u32 next_hash; 2259 }; 2260 2261 /* calculate the first block number of the group */ 2262 static inline ext4_fsblk_t 2263 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2264 { 2265 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2266 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2267 } 2268 2269 /* 2270 * Special error return code only used by dx_probe() and its callers. 2271 */ 2272 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2273 2274 /* htree levels for ext4 */ 2275 #define EXT4_HTREE_LEVEL_COMPAT 2 2276 #define EXT4_HTREE_LEVEL 3 2277 2278 static inline int ext4_dir_htree_level(struct super_block *sb) 2279 { 2280 return ext4_has_feature_largedir(sb) ? 2281 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT; 2282 } 2283 2284 /* 2285 * Timeout and state flag for lazy initialization inode thread. 2286 */ 2287 #define EXT4_DEF_LI_WAIT_MULT 10 2288 #define EXT4_DEF_LI_MAX_START_DELAY 5 2289 #define EXT4_LAZYINIT_QUIT 0x0001 2290 #define EXT4_LAZYINIT_RUNNING 0x0002 2291 2292 /* 2293 * Lazy inode table initialization info 2294 */ 2295 struct ext4_lazy_init { 2296 unsigned long li_state; 2297 struct list_head li_request_list; 2298 struct mutex li_list_mtx; 2299 }; 2300 2301 struct ext4_li_request { 2302 struct super_block *lr_super; 2303 struct ext4_sb_info *lr_sbi; 2304 ext4_group_t lr_next_group; 2305 struct list_head lr_request; 2306 unsigned long lr_next_sched; 2307 unsigned long lr_timeout; 2308 }; 2309 2310 struct ext4_features { 2311 struct kobject f_kobj; 2312 struct completion f_kobj_unregister; 2313 }; 2314 2315 /* 2316 * This structure will be used for multiple mount protection. It will be 2317 * written into the block number saved in the s_mmp_block field in the 2318 * superblock. Programs that check MMP should assume that if 2319 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2320 * to use the filesystem, regardless of how old the timestamp is. 2321 */ 2322 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2323 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2324 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2325 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2326 2327 struct mmp_struct { 2328 __le32 mmp_magic; /* Magic number for MMP */ 2329 __le32 mmp_seq; /* Sequence no. updated periodically */ 2330 2331 /* 2332 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2333 * purposes and do not affect the correctness of the algorithm 2334 */ 2335 __le64 mmp_time; /* Time last updated */ 2336 char mmp_nodename[64]; /* Node which last updated MMP block */ 2337 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2338 2339 /* 2340 * mmp_check_interval is used to verify if the MMP block has been 2341 * updated on the block device. The value is updated based on the 2342 * maximum time to write the MMP block during an update cycle. 2343 */ 2344 __le16 mmp_check_interval; 2345 2346 __le16 mmp_pad1; 2347 __le32 mmp_pad2[226]; 2348 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2349 }; 2350 2351 /* arguments passed to the mmp thread */ 2352 struct mmpd_data { 2353 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2354 struct super_block *sb; /* super block of the fs */ 2355 }; 2356 2357 /* 2358 * Check interval multiplier 2359 * The MMP block is written every update interval and initially checked every 2360 * update interval x the multiplier (the value is then adapted based on the 2361 * write latency). The reason is that writes can be delayed under load and we 2362 * don't want readers to incorrectly assume that the filesystem is no longer 2363 * in use. 2364 */ 2365 #define EXT4_MMP_CHECK_MULT 2UL 2366 2367 /* 2368 * Minimum interval for MMP checking in seconds. 2369 */ 2370 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2371 2372 /* 2373 * Maximum interval for MMP checking in seconds. 2374 */ 2375 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2376 2377 /* 2378 * Function prototypes 2379 */ 2380 2381 /* 2382 * Ok, these declarations are also in <linux/kernel.h> but none of the 2383 * ext4 source programs needs to include it so they are duplicated here. 2384 */ 2385 # define NORET_TYPE /**/ 2386 # define ATTRIB_NORET __attribute__((noreturn)) 2387 # define NORET_AND noreturn, 2388 2389 /* bitmap.c */ 2390 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2391 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2392 struct ext4_group_desc *gdp, 2393 struct buffer_head *bh, int sz); 2394 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2395 struct ext4_group_desc *gdp, 2396 struct buffer_head *bh, int sz); 2397 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2398 struct ext4_group_desc *gdp, 2399 struct buffer_head *bh); 2400 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2401 struct ext4_group_desc *gdp, 2402 struct buffer_head *bh); 2403 2404 /* balloc.c */ 2405 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2406 ext4_fsblk_t blocknr, 2407 ext4_group_t *blockgrpp, 2408 ext4_grpblk_t *offsetp); 2409 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2410 ext4_fsblk_t block); 2411 2412 extern unsigned int ext4_block_group(struct super_block *sb, 2413 ext4_fsblk_t blocknr); 2414 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2415 ext4_fsblk_t blocknr); 2416 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2417 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2418 ext4_group_t group); 2419 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2420 ext4_fsblk_t goal, 2421 unsigned int flags, 2422 unsigned long *count, 2423 int *errp); 2424 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2425 s64 nclusters, unsigned int flags); 2426 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2427 extern void ext4_check_blocks_bitmap(struct super_block *); 2428 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2429 ext4_group_t block_group, 2430 struct buffer_head ** bh); 2431 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2432 2433 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2434 ext4_group_t block_group); 2435 extern int ext4_wait_block_bitmap(struct super_block *sb, 2436 ext4_group_t block_group, 2437 struct buffer_head *bh); 2438 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2439 ext4_group_t block_group); 2440 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2441 ext4_group_t block_group, 2442 struct ext4_group_desc *gdp); 2443 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2444 2445 #ifdef CONFIG_UNICODE 2446 extern void ext4_fname_setup_ci_filename(struct inode *dir, 2447 const struct qstr *iname, 2448 struct fscrypt_str *fname); 2449 #endif 2450 2451 #ifdef CONFIG_FS_ENCRYPTION 2452 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst, 2453 const struct fscrypt_name *src) 2454 { 2455 memset(dst, 0, sizeof(*dst)); 2456 2457 dst->usr_fname = src->usr_fname; 2458 dst->disk_name = src->disk_name; 2459 dst->hinfo.hash = src->hash; 2460 dst->hinfo.minor_hash = src->minor_hash; 2461 dst->crypto_buf = src->crypto_buf; 2462 } 2463 2464 static inline int ext4_fname_setup_filename(struct inode *dir, 2465 const struct qstr *iname, 2466 int lookup, 2467 struct ext4_filename *fname) 2468 { 2469 struct fscrypt_name name; 2470 int err; 2471 2472 err = fscrypt_setup_filename(dir, iname, lookup, &name); 2473 if (err) 2474 return err; 2475 2476 ext4_fname_from_fscrypt_name(fname, &name); 2477 2478 #ifdef CONFIG_UNICODE 2479 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name); 2480 #endif 2481 return 0; 2482 } 2483 2484 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2485 struct dentry *dentry, 2486 struct ext4_filename *fname) 2487 { 2488 struct fscrypt_name name; 2489 int err; 2490 2491 err = fscrypt_prepare_lookup(dir, dentry, &name); 2492 if (err) 2493 return err; 2494 2495 ext4_fname_from_fscrypt_name(fname, &name); 2496 2497 #ifdef CONFIG_UNICODE 2498 ext4_fname_setup_ci_filename(dir, &dentry->d_name, &fname->cf_name); 2499 #endif 2500 return 0; 2501 } 2502 2503 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2504 { 2505 struct fscrypt_name name; 2506 2507 name.crypto_buf = fname->crypto_buf; 2508 fscrypt_free_filename(&name); 2509 2510 fname->crypto_buf.name = NULL; 2511 fname->usr_fname = NULL; 2512 fname->disk_name.name = NULL; 2513 2514 #ifdef CONFIG_UNICODE 2515 kfree(fname->cf_name.name); 2516 fname->cf_name.name = NULL; 2517 #endif 2518 } 2519 #else /* !CONFIG_FS_ENCRYPTION */ 2520 static inline int ext4_fname_setup_filename(struct inode *dir, 2521 const struct qstr *iname, 2522 int lookup, 2523 struct ext4_filename *fname) 2524 { 2525 fname->usr_fname = iname; 2526 fname->disk_name.name = (unsigned char *) iname->name; 2527 fname->disk_name.len = iname->len; 2528 2529 #ifdef CONFIG_UNICODE 2530 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name); 2531 #endif 2532 2533 return 0; 2534 } 2535 2536 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2537 struct dentry *dentry, 2538 struct ext4_filename *fname) 2539 { 2540 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname); 2541 } 2542 2543 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2544 { 2545 #ifdef CONFIG_UNICODE 2546 kfree(fname->cf_name.name); 2547 fname->cf_name.name = NULL; 2548 #endif 2549 } 2550 #endif /* !CONFIG_FS_ENCRYPTION */ 2551 2552 /* dir.c */ 2553 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2554 struct file *, 2555 struct ext4_dir_entry_2 *, 2556 struct buffer_head *, char *, int, 2557 unsigned int); 2558 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2559 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2560 (de), (bh), (buf), (size), (offset))) 2561 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2562 __u32 minor_hash, 2563 struct ext4_dir_entry_2 *dirent, 2564 struct fscrypt_str *ent_name); 2565 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2566 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2567 struct buffer_head *bh, 2568 void *buf, int buf_size, 2569 struct ext4_filename *fname, 2570 struct ext4_dir_entry_2 **dest_de); 2571 void ext4_insert_dentry(struct inode *inode, 2572 struct ext4_dir_entry_2 *de, 2573 int buf_size, 2574 struct ext4_filename *fname); 2575 static inline void ext4_update_dx_flag(struct inode *inode) 2576 { 2577 if (!ext4_has_feature_dir_index(inode->i_sb)) { 2578 /* ext4_iget() should have caught this... */ 2579 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb)); 2580 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2581 } 2582 } 2583 static const unsigned char ext4_filetype_table[] = { 2584 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2585 }; 2586 2587 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2588 { 2589 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2590 return DT_UNKNOWN; 2591 2592 return ext4_filetype_table[filetype]; 2593 } 2594 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2595 void *buf, int buf_size); 2596 2597 /* fsync.c */ 2598 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2599 2600 /* hash.c */ 2601 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len, 2602 struct dx_hash_info *hinfo); 2603 2604 /* ialloc.c */ 2605 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2606 const struct qstr *qstr, __u32 goal, 2607 uid_t *owner, __u32 i_flags, 2608 int handle_type, unsigned int line_no, 2609 int nblocks); 2610 2611 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \ 2612 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2613 i_flags, 0, 0, 0) 2614 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2615 type, nblocks) \ 2616 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2617 0, (type), __LINE__, (nblocks)) 2618 2619 2620 extern void ext4_free_inode(handle_t *, struct inode *); 2621 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2622 extern unsigned long ext4_count_free_inodes(struct super_block *); 2623 extern unsigned long ext4_count_dirs(struct super_block *); 2624 extern void ext4_check_inodes_bitmap(struct super_block *); 2625 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2626 extern int ext4_init_inode_table(struct super_block *sb, 2627 ext4_group_t group, int barrier); 2628 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2629 2630 /* mballoc.c */ 2631 extern const struct seq_operations ext4_mb_seq_groups_ops; 2632 extern long ext4_mb_stats; 2633 extern long ext4_mb_max_to_scan; 2634 extern int ext4_mb_init(struct super_block *); 2635 extern int ext4_mb_release(struct super_block *); 2636 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2637 struct ext4_allocation_request *, int *); 2638 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2639 extern void ext4_discard_preallocations(struct inode *); 2640 extern int __init ext4_init_mballoc(void); 2641 extern void ext4_exit_mballoc(void); 2642 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2643 struct buffer_head *bh, ext4_fsblk_t block, 2644 unsigned long count, int flags); 2645 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2646 ext4_group_t ngroups); 2647 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2648 ext4_group_t i, struct ext4_group_desc *desc); 2649 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2650 ext4_fsblk_t block, unsigned long count); 2651 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2652 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid); 2653 2654 /* inode.c */ 2655 int ext4_inode_is_fast_symlink(struct inode *inode); 2656 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2657 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2658 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count, 2659 bool wait, struct buffer_head **bhs); 2660 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2661 struct buffer_head *bh_result, int create); 2662 int ext4_get_block(struct inode *inode, sector_t iblock, 2663 struct buffer_head *bh_result, int create); 2664 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2665 struct buffer_head *bh, int create); 2666 int ext4_walk_page_buffers(handle_t *handle, 2667 struct buffer_head *head, 2668 unsigned from, 2669 unsigned to, 2670 int *partial, 2671 int (*fn)(handle_t *handle, 2672 struct buffer_head *bh)); 2673 int do_journal_get_write_access(handle_t *handle, 2674 struct buffer_head *bh); 2675 #define FALL_BACK_TO_NONDELALLOC 1 2676 #define CONVERT_INLINE_DATA 2 2677 2678 typedef enum { 2679 EXT4_IGET_NORMAL = 0, 2680 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */ 2681 EXT4_IGET_HANDLE = 0x0002 /* Inode # is from a handle */ 2682 } ext4_iget_flags; 2683 2684 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, 2685 ext4_iget_flags flags, const char *function, 2686 unsigned int line); 2687 2688 #define ext4_iget(sb, ino, flags) \ 2689 __ext4_iget((sb), (ino), (flags), __func__, __LINE__) 2690 2691 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2692 extern int ext4_setattr(struct dentry *, struct iattr *); 2693 extern int ext4_getattr(const struct path *, struct kstat *, u32, unsigned int); 2694 extern void ext4_evict_inode(struct inode *); 2695 extern void ext4_clear_inode(struct inode *); 2696 extern int ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int); 2697 extern int ext4_sync_inode(handle_t *, struct inode *); 2698 extern void ext4_dirty_inode(struct inode *, int); 2699 extern int ext4_change_inode_journal_flag(struct inode *, int); 2700 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2701 extern int ext4_inode_attach_jinode(struct inode *inode); 2702 extern int ext4_can_truncate(struct inode *inode); 2703 extern int ext4_truncate(struct inode *); 2704 extern int ext4_break_layouts(struct inode *); 2705 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2706 extern void ext4_set_inode_flags(struct inode *); 2707 extern int ext4_alloc_da_blocks(struct inode *inode); 2708 extern void ext4_set_aops(struct inode *inode); 2709 extern int ext4_writepage_trans_blocks(struct inode *); 2710 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2711 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2712 loff_t lstart, loff_t lend); 2713 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf); 2714 extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf); 2715 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2716 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 2717 extern void ext4_da_release_space(struct inode *inode, int to_free); 2718 extern void ext4_da_update_reserve_space(struct inode *inode, 2719 int used, int quota_claim); 2720 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 2721 ext4_fsblk_t pblk, ext4_lblk_t len); 2722 2723 /* indirect.c */ 2724 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2725 struct ext4_map_blocks *map, int flags); 2726 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2727 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2728 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2729 ext4_lblk_t start, ext4_lblk_t end); 2730 2731 /* ioctl.c */ 2732 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2733 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2734 2735 /* migrate.c */ 2736 extern int ext4_ext_migrate(struct inode *); 2737 extern int ext4_ind_migrate(struct inode *inode); 2738 2739 /* namei.c */ 2740 extern int ext4_dirblock_csum_verify(struct inode *inode, 2741 struct buffer_head *bh); 2742 extern int ext4_orphan_add(handle_t *, struct inode *); 2743 extern int ext4_orphan_del(handle_t *, struct inode *); 2744 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2745 __u32 start_minor_hash, __u32 *next_hash); 2746 extern int ext4_search_dir(struct buffer_head *bh, 2747 char *search_buf, 2748 int buf_size, 2749 struct inode *dir, 2750 struct ext4_filename *fname, 2751 unsigned int offset, 2752 struct ext4_dir_entry_2 **res_dir); 2753 extern int ext4_generic_delete_entry(handle_t *handle, 2754 struct inode *dir, 2755 struct ext4_dir_entry_2 *de_del, 2756 struct buffer_head *bh, 2757 void *entry_buf, 2758 int buf_size, 2759 int csum_size); 2760 extern bool ext4_empty_dir(struct inode *inode); 2761 2762 /* resize.c */ 2763 extern void ext4_kvfree_array_rcu(void *to_free); 2764 extern int ext4_group_add(struct super_block *sb, 2765 struct ext4_new_group_data *input); 2766 extern int ext4_group_extend(struct super_block *sb, 2767 struct ext4_super_block *es, 2768 ext4_fsblk_t n_blocks_count); 2769 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2770 2771 /* super.c */ 2772 extern struct buffer_head *ext4_sb_bread(struct super_block *sb, 2773 sector_t block, int op_flags); 2774 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 2775 extern int ext4_calculate_overhead(struct super_block *sb); 2776 extern void ext4_superblock_csum_set(struct super_block *sb); 2777 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2778 ext4_group_t ngroup); 2779 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2780 char nbuf[16]); 2781 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb, 2782 ext4_group_t block_group, 2783 unsigned int flags); 2784 2785 extern __printf(6, 7) 2786 void __ext4_error(struct super_block *, const char *, unsigned int, int, __u64, 2787 const char *, ...); 2788 extern __printf(6, 7) 2789 void __ext4_error_inode(struct inode *, const char *, unsigned int, 2790 ext4_fsblk_t, int, const char *, ...); 2791 extern __printf(5, 6) 2792 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2793 const char *, ...); 2794 extern void __ext4_std_error(struct super_block *, const char *, 2795 unsigned int, int); 2796 extern __printf(5, 6) 2797 void __ext4_abort(struct super_block *, const char *, unsigned int, int, 2798 const char *, ...); 2799 extern __printf(4, 5) 2800 void __ext4_warning(struct super_block *, const char *, unsigned int, 2801 const char *, ...); 2802 extern __printf(4, 5) 2803 void __ext4_warning_inode(const struct inode *inode, const char *function, 2804 unsigned int line, const char *fmt, ...); 2805 extern __printf(3, 4) 2806 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2807 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2808 const char *, unsigned int, const char *); 2809 extern __printf(7, 8) 2810 void __ext4_grp_locked_error(const char *, unsigned int, 2811 struct super_block *, ext4_group_t, 2812 unsigned long, ext4_fsblk_t, 2813 const char *, ...); 2814 2815 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 2816 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 2817 2818 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \ 2819 __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a) 2820 2821 #define ext4_error_inode_block(inode, block, err, fmt, a...) \ 2822 __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \ 2823 (fmt), ## a) 2824 2825 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 2826 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 2827 2828 #ifdef CONFIG_PRINTK 2829 2830 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2831 __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__) 2832 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 2833 __ext4_error_inode((inode), (func), (line), (block), \ 2834 (err), (fmt), ##__VA_ARGS__) 2835 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2836 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2837 #define ext4_error(sb, fmt, ...) \ 2838 __ext4_error((sb), __func__, __LINE__, 0, 0, (fmt), ##__VA_ARGS__) 2839 #define ext4_error_err(sb, err, fmt, ...) \ 2840 __ext4_error((sb), __func__, __LINE__, (err), 0, (fmt), ##__VA_ARGS__) 2841 #define ext4_abort(sb, err, fmt, ...) \ 2842 __ext4_abort((sb), __func__, __LINE__, (err), (fmt), ##__VA_ARGS__) 2843 #define ext4_warning(sb, fmt, ...) \ 2844 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2845 #define ext4_warning_inode(inode, fmt, ...) \ 2846 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 2847 #define ext4_msg(sb, level, fmt, ...) \ 2848 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 2849 #define dump_mmp_msg(sb, mmp, msg) \ 2850 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 2851 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2852 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 2853 fmt, ##__VA_ARGS__) 2854 2855 #else 2856 2857 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2858 do { \ 2859 no_printk(fmt, ##__VA_ARGS__); \ 2860 __ext4_error_inode(inode, "", 0, block, 0, " "); \ 2861 } while (0) 2862 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 2863 do { \ 2864 no_printk(fmt, ##__VA_ARGS__); \ 2865 __ext4_error_inode(inode, "", 0, block, err, " "); \ 2866 } while (0) 2867 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2868 do { \ 2869 no_printk(fmt, ##__VA_ARGS__); \ 2870 __ext4_error_file(file, "", 0, block, " "); \ 2871 } while (0) 2872 #define ext4_error(sb, fmt, ...) \ 2873 do { \ 2874 no_printk(fmt, ##__VA_ARGS__); \ 2875 __ext4_error(sb, "", 0, 0, 0, " "); \ 2876 } while (0) 2877 #define ext4_error_err(sb, err, fmt, ...) \ 2878 do { \ 2879 no_printk(fmt, ##__VA_ARGS__); \ 2880 __ext4_error(sb, "", 0, err, 0, " "); \ 2881 } while (0) 2882 #define ext4_abort(sb, err, fmt, ...) \ 2883 do { \ 2884 no_printk(fmt, ##__VA_ARGS__); \ 2885 __ext4_abort(sb, "", 0, err, " "); \ 2886 } while (0) 2887 #define ext4_warning(sb, fmt, ...) \ 2888 do { \ 2889 no_printk(fmt, ##__VA_ARGS__); \ 2890 __ext4_warning(sb, "", 0, " "); \ 2891 } while (0) 2892 #define ext4_warning_inode(inode, fmt, ...) \ 2893 do { \ 2894 no_printk(fmt, ##__VA_ARGS__); \ 2895 __ext4_warning_inode(inode, "", 0, " "); \ 2896 } while (0) 2897 #define ext4_msg(sb, level, fmt, ...) \ 2898 do { \ 2899 no_printk(fmt, ##__VA_ARGS__); \ 2900 __ext4_msg(sb, "", " "); \ 2901 } while (0) 2902 #define dump_mmp_msg(sb, mmp, msg) \ 2903 __dump_mmp_msg(sb, mmp, "", 0, "") 2904 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2905 do { \ 2906 no_printk(fmt, ##__VA_ARGS__); \ 2907 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 2908 } while (0) 2909 2910 #endif 2911 2912 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2913 __u32 compat); 2914 extern int ext4_update_rocompat_feature(handle_t *handle, 2915 struct super_block *sb, __u32 rocompat); 2916 extern int ext4_update_incompat_feature(handle_t *handle, 2917 struct super_block *sb, __u32 incompat); 2918 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2919 struct ext4_group_desc *bg); 2920 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2921 struct ext4_group_desc *bg); 2922 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2923 struct ext4_group_desc *bg); 2924 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2925 struct ext4_group_desc *bg); 2926 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2927 struct ext4_group_desc *bg); 2928 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2929 struct ext4_group_desc *bg); 2930 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2931 struct ext4_group_desc *bg); 2932 extern void ext4_block_bitmap_set(struct super_block *sb, 2933 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2934 extern void ext4_inode_bitmap_set(struct super_block *sb, 2935 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2936 extern void ext4_inode_table_set(struct super_block *sb, 2937 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2938 extern void ext4_free_group_clusters_set(struct super_block *sb, 2939 struct ext4_group_desc *bg, 2940 __u32 count); 2941 extern void ext4_free_inodes_set(struct super_block *sb, 2942 struct ext4_group_desc *bg, __u32 count); 2943 extern void ext4_used_dirs_set(struct super_block *sb, 2944 struct ext4_group_desc *bg, __u32 count); 2945 extern void ext4_itable_unused_set(struct super_block *sb, 2946 struct ext4_group_desc *bg, __u32 count); 2947 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2948 struct ext4_group_desc *gdp); 2949 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2950 struct ext4_group_desc *gdp); 2951 extern int ext4_register_li_request(struct super_block *sb, 2952 ext4_group_t first_not_zeroed); 2953 2954 static inline int ext4_has_metadata_csum(struct super_block *sb) 2955 { 2956 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 2957 !EXT4_SB(sb)->s_chksum_driver); 2958 2959 return ext4_has_feature_metadata_csum(sb) && 2960 (EXT4_SB(sb)->s_chksum_driver != NULL); 2961 } 2962 2963 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2964 { 2965 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb); 2966 } 2967 2968 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2969 { 2970 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2971 le32_to_cpu(es->s_blocks_count_lo); 2972 } 2973 2974 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2975 { 2976 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2977 le32_to_cpu(es->s_r_blocks_count_lo); 2978 } 2979 2980 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2981 { 2982 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2983 le32_to_cpu(es->s_free_blocks_count_lo); 2984 } 2985 2986 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2987 ext4_fsblk_t blk) 2988 { 2989 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2990 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2991 } 2992 2993 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2994 ext4_fsblk_t blk) 2995 { 2996 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2997 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2998 } 2999 3000 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 3001 ext4_fsblk_t blk) 3002 { 3003 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 3004 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 3005 } 3006 3007 static inline loff_t ext4_isize(struct super_block *sb, 3008 struct ext4_inode *raw_inode) 3009 { 3010 if (ext4_has_feature_largedir(sb) || 3011 S_ISREG(le16_to_cpu(raw_inode->i_mode))) 3012 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 3013 le32_to_cpu(raw_inode->i_size_lo); 3014 3015 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 3016 } 3017 3018 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 3019 { 3020 raw_inode->i_size_lo = cpu_to_le32(i_size); 3021 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 3022 } 3023 3024 static inline 3025 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 3026 ext4_group_t group) 3027 { 3028 struct ext4_group_info **grp_info; 3029 long indexv, indexh; 3030 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 3031 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 3032 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 3033 grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv); 3034 return grp_info[indexh]; 3035 } 3036 3037 /* 3038 * Reading s_groups_count requires using smp_rmb() afterwards. See 3039 * the locking protocol documented in the comments of ext4_group_add() 3040 * in resize.c 3041 */ 3042 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 3043 { 3044 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 3045 3046 smp_rmb(); 3047 return ngroups; 3048 } 3049 3050 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 3051 ext4_group_t block_group) 3052 { 3053 return block_group >> sbi->s_log_groups_per_flex; 3054 } 3055 3056 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 3057 { 3058 return 1 << sbi->s_log_groups_per_flex; 3059 } 3060 3061 #define ext4_std_error(sb, errno) \ 3062 do { \ 3063 if ((errno)) \ 3064 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 3065 } while (0) 3066 3067 #ifdef CONFIG_SMP 3068 /* Each CPU can accumulate percpu_counter_batch clusters in their local 3069 * counters. So we need to make sure we have free clusters more 3070 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 3071 */ 3072 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 3073 #else 3074 #define EXT4_FREECLUSTERS_WATERMARK 0 3075 #endif 3076 3077 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 3078 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 3079 { 3080 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 3081 !inode_is_locked(inode)); 3082 down_write(&EXT4_I(inode)->i_data_sem); 3083 if (newsize > EXT4_I(inode)->i_disksize) 3084 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize); 3085 up_write(&EXT4_I(inode)->i_data_sem); 3086 } 3087 3088 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 3089 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 3090 { 3091 int changed = 0; 3092 3093 if (newsize > inode->i_size) { 3094 i_size_write(inode, newsize); 3095 changed = 1; 3096 } 3097 if (newsize > EXT4_I(inode)->i_disksize) { 3098 ext4_update_i_disksize(inode, newsize); 3099 changed |= 2; 3100 } 3101 return changed; 3102 } 3103 3104 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 3105 loff_t len); 3106 3107 struct ext4_group_info { 3108 unsigned long bb_state; 3109 struct rb_root bb_free_root; 3110 ext4_grpblk_t bb_first_free; /* first free block */ 3111 ext4_grpblk_t bb_free; /* total free blocks */ 3112 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 3113 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 3114 struct list_head bb_prealloc_list; 3115 #ifdef DOUBLE_CHECK 3116 void *bb_bitmap; 3117 #endif 3118 struct rw_semaphore alloc_sem; 3119 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 3120 * regions, index is order. 3121 * bb_counters[3] = 5 means 3122 * 5 free 8-block regions. */ 3123 }; 3124 3125 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 3126 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 3127 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 3128 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 3129 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \ 3130 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT) 3131 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \ 3132 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT) 3133 3134 #define EXT4_MB_GRP_NEED_INIT(grp) \ 3135 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 3136 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 3137 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3138 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 3139 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3140 3141 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 3142 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3143 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 3144 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3145 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 3146 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3147 3148 #define EXT4_MAX_CONTENTION 8 3149 #define EXT4_CONTENTION_THRESHOLD 2 3150 3151 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 3152 ext4_group_t group) 3153 { 3154 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 3155 } 3156 3157 /* 3158 * Returns true if the filesystem is busy enough that attempts to 3159 * access the block group locks has run into contention. 3160 */ 3161 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 3162 { 3163 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 3164 } 3165 3166 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 3167 { 3168 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 3169 if (spin_trylock(lock)) 3170 /* 3171 * We're able to grab the lock right away, so drop the 3172 * lock contention counter. 3173 */ 3174 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 3175 else { 3176 /* 3177 * The lock is busy, so bump the contention counter, 3178 * and then wait on the spin lock. 3179 */ 3180 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 3181 EXT4_MAX_CONTENTION); 3182 spin_lock(lock); 3183 } 3184 } 3185 3186 static inline void ext4_unlock_group(struct super_block *sb, 3187 ext4_group_t group) 3188 { 3189 spin_unlock(ext4_group_lock_ptr(sb, group)); 3190 } 3191 3192 /* 3193 * Block validity checking 3194 */ 3195 #define ext4_check_indirect_blockref(inode, bh) \ 3196 ext4_check_blockref(__func__, __LINE__, inode, \ 3197 (__le32 *)(bh)->b_data, \ 3198 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 3199 3200 #define ext4_ind_check_inode(inode) \ 3201 ext4_check_blockref(__func__, __LINE__, inode, \ 3202 EXT4_I(inode)->i_data, \ 3203 EXT4_NDIR_BLOCKS) 3204 3205 /* 3206 * Inodes and files operations 3207 */ 3208 3209 /* dir.c */ 3210 extern const struct file_operations ext4_dir_operations; 3211 3212 #ifdef CONFIG_UNICODE 3213 extern const struct dentry_operations ext4_dentry_ops; 3214 #endif 3215 3216 /* file.c */ 3217 extern const struct inode_operations ext4_file_inode_operations; 3218 extern const struct file_operations ext4_file_operations; 3219 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 3220 3221 /* inline.c */ 3222 extern int ext4_get_max_inline_size(struct inode *inode); 3223 extern int ext4_find_inline_data_nolock(struct inode *inode); 3224 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 3225 unsigned int len); 3226 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 3227 3228 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 3229 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 3230 struct inode *inode, 3231 loff_t pos, unsigned len, 3232 unsigned flags, 3233 struct page **pagep); 3234 extern int ext4_write_inline_data_end(struct inode *inode, 3235 loff_t pos, unsigned len, 3236 unsigned copied, 3237 struct page *page); 3238 extern struct buffer_head * 3239 ext4_journalled_write_inline_data(struct inode *inode, 3240 unsigned len, 3241 struct page *page); 3242 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 3243 struct inode *inode, 3244 loff_t pos, unsigned len, 3245 unsigned flags, 3246 struct page **pagep, 3247 void **fsdata); 3248 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 3249 unsigned len, unsigned copied, 3250 struct page *page); 3251 extern int ext4_try_add_inline_entry(handle_t *handle, 3252 struct ext4_filename *fname, 3253 struct inode *dir, struct inode *inode); 3254 extern int ext4_try_create_inline_dir(handle_t *handle, 3255 struct inode *parent, 3256 struct inode *inode); 3257 extern int ext4_read_inline_dir(struct file *filp, 3258 struct dir_context *ctx, 3259 int *has_inline_data); 3260 extern int ext4_inlinedir_to_tree(struct file *dir_file, 3261 struct inode *dir, ext4_lblk_t block, 3262 struct dx_hash_info *hinfo, 3263 __u32 start_hash, __u32 start_minor_hash, 3264 int *has_inline_data); 3265 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3266 struct ext4_filename *fname, 3267 struct ext4_dir_entry_2 **res_dir, 3268 int *has_inline_data); 3269 extern int ext4_delete_inline_entry(handle_t *handle, 3270 struct inode *dir, 3271 struct ext4_dir_entry_2 *de_del, 3272 struct buffer_head *bh, 3273 int *has_inline_data); 3274 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); 3275 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3276 struct ext4_dir_entry_2 **parent_de, 3277 int *retval); 3278 extern int ext4_inline_data_fiemap(struct inode *inode, 3279 struct fiemap_extent_info *fieinfo, 3280 int *has_inline, __u64 start, __u64 len); 3281 3282 struct iomap; 3283 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap); 3284 3285 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3286 3287 extern int ext4_convert_inline_data(struct inode *inode); 3288 3289 static inline int ext4_has_inline_data(struct inode *inode) 3290 { 3291 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3292 EXT4_I(inode)->i_inline_off; 3293 } 3294 3295 /* namei.c */ 3296 extern const struct inode_operations ext4_dir_inode_operations; 3297 extern const struct inode_operations ext4_special_inode_operations; 3298 extern struct dentry *ext4_get_parent(struct dentry *child); 3299 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3300 struct ext4_dir_entry_2 *de, 3301 int blocksize, int csum_size, 3302 unsigned int parent_ino, int dotdot_real_len); 3303 extern void ext4_initialize_dirent_tail(struct buffer_head *bh, 3304 unsigned int blocksize); 3305 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode, 3306 struct buffer_head *bh); 3307 extern int ext4_ci_compare(const struct inode *parent, 3308 const struct qstr *fname, 3309 const struct qstr *entry, bool quick); 3310 3311 #define S_SHIFT 12 3312 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = { 3313 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3314 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3315 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3316 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3317 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3318 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3319 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3320 }; 3321 3322 static inline void ext4_set_de_type(struct super_block *sb, 3323 struct ext4_dir_entry_2 *de, 3324 umode_t mode) { 3325 if (ext4_has_feature_filetype(sb)) 3326 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3327 } 3328 3329 /* readpages.c */ 3330 extern int ext4_mpage_readpages(struct address_space *mapping, 3331 struct list_head *pages, struct page *page, 3332 unsigned nr_pages, bool is_readahead); 3333 extern int __init ext4_init_post_read_processing(void); 3334 extern void ext4_exit_post_read_processing(void); 3335 3336 /* symlink.c */ 3337 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3338 extern const struct inode_operations ext4_symlink_inode_operations; 3339 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3340 3341 /* sysfs.c */ 3342 extern int ext4_register_sysfs(struct super_block *sb); 3343 extern void ext4_unregister_sysfs(struct super_block *sb); 3344 extern int __init ext4_init_sysfs(void); 3345 extern void ext4_exit_sysfs(void); 3346 3347 /* block_validity */ 3348 extern void ext4_release_system_zone(struct super_block *sb); 3349 extern int ext4_setup_system_zone(struct super_block *sb); 3350 extern int __init ext4_init_system_zone(void); 3351 extern void ext4_exit_system_zone(void); 3352 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 3353 ext4_fsblk_t start_blk, 3354 unsigned int count); 3355 extern int ext4_check_blockref(const char *, unsigned int, 3356 struct inode *, __le32 *, unsigned int); 3357 3358 /* extents.c */ 3359 struct ext4_ext_path; 3360 struct ext4_extent; 3361 3362 /* 3363 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3364 * __le32. 3365 */ 3366 #define EXT_MAX_BLOCKS 0xffffffff 3367 3368 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode); 3369 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3370 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3371 struct ext4_map_blocks *map, int flags); 3372 extern int ext4_ext_truncate(handle_t *, struct inode *); 3373 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3374 ext4_lblk_t end); 3375 extern void ext4_ext_init(struct super_block *); 3376 extern void ext4_ext_release(struct super_block *); 3377 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3378 loff_t len); 3379 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3380 loff_t offset, ssize_t len); 3381 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle, 3382 ext4_io_end_t *io_end); 3383 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3384 struct ext4_map_blocks *map, int flags); 3385 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3386 int num, 3387 struct ext4_ext_path *path); 3388 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3389 struct ext4_ext_path **, 3390 struct ext4_extent *, int); 3391 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3392 struct ext4_ext_path **, 3393 int flags); 3394 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 3395 extern int ext4_ext_check_inode(struct inode *inode); 3396 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3397 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3398 __u64 start, __u64 len); 3399 extern int ext4_get_es_cache(struct inode *inode, 3400 struct fiemap_extent_info *fieinfo, 3401 __u64 start, __u64 len); 3402 extern int ext4_ext_precache(struct inode *inode); 3403 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3404 struct inode *inode2, ext4_lblk_t lblk1, 3405 ext4_lblk_t lblk2, ext4_lblk_t count, 3406 int mark_unwritten,int *err); 3407 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu); 3408 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode, 3409 int check_cred, int restart_cred, 3410 int revoke_cred); 3411 3412 3413 /* move_extent.c */ 3414 extern void ext4_double_down_write_data_sem(struct inode *first, 3415 struct inode *second); 3416 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3417 struct inode *donor_inode); 3418 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3419 __u64 start_orig, __u64 start_donor, 3420 __u64 len, __u64 *moved_len); 3421 3422 /* page-io.c */ 3423 extern int __init ext4_init_pageio(void); 3424 extern void ext4_exit_pageio(void); 3425 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3426 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3427 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3428 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3429 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3430 struct writeback_control *wbc); 3431 extern void ext4_end_io_rsv_work(struct work_struct *work); 3432 extern void ext4_io_submit(struct ext4_io_submit *io); 3433 extern int ext4_bio_write_page(struct ext4_io_submit *io, 3434 struct page *page, 3435 int len, 3436 struct writeback_control *wbc, 3437 bool keep_towrite); 3438 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end); 3439 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end); 3440 3441 /* mmp.c */ 3442 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3443 3444 /* verity.c */ 3445 extern const struct fsverity_operations ext4_verityops; 3446 3447 /* 3448 * Add new method to test whether block and inode bitmaps are properly 3449 * initialized. With uninit_bg reading the block from disk is not enough 3450 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3451 */ 3452 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3453 3454 static inline int bitmap_uptodate(struct buffer_head *bh) 3455 { 3456 return (buffer_uptodate(bh) && 3457 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3458 } 3459 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3460 { 3461 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3462 } 3463 3464 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3465 3466 /* For ioend & aio unwritten conversion wait queues */ 3467 #define EXT4_WQ_HASH_SZ 37 3468 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3469 EXT4_WQ_HASH_SZ]) 3470 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3471 3472 extern int ext4_resize_begin(struct super_block *sb); 3473 extern void ext4_resize_end(struct super_block *sb); 3474 3475 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 3476 struct ext4_io_end *io_end) 3477 { 3478 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 3479 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3480 atomic_inc(&EXT4_I(inode)->i_unwritten); 3481 } 3482 } 3483 3484 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3485 { 3486 struct inode *inode = io_end->inode; 3487 3488 if (io_end->flag & EXT4_IO_END_UNWRITTEN) { 3489 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3490 /* Wake up anyone waiting on unwritten extent conversion */ 3491 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) 3492 wake_up_all(ext4_ioend_wq(inode)); 3493 } 3494 } 3495 3496 extern const struct iomap_ops ext4_iomap_ops; 3497 extern const struct iomap_ops ext4_iomap_overwrite_ops; 3498 extern const struct iomap_ops ext4_iomap_report_ops; 3499 3500 static inline int ext4_buffer_uptodate(struct buffer_head *bh) 3501 { 3502 /* 3503 * If the buffer has the write error flag, we have failed 3504 * to write out data in the block. In this case, we don't 3505 * have to read the block because we may read the old data 3506 * successfully. 3507 */ 3508 if (!buffer_uptodate(bh) && buffer_write_io_error(bh)) 3509 set_buffer_uptodate(bh); 3510 return buffer_uptodate(bh); 3511 } 3512 3513 #endif /* __KERNEL__ */ 3514 3515 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3516 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3517 3518 #endif /* _EXT4_H */ 3519