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 #include <linux/fiemap.h> 40 #ifdef __KERNEL__ 41 #include <linux/compat.h> 42 #endif 43 44 #include <linux/fscrypt.h> 45 #include <linux/fsverity.h> 46 47 #include <linux/compiler.h> 48 49 /* 50 * The fourth extended filesystem constants/structures 51 */ 52 53 /* 54 * with AGGRESSIVE_CHECK allocator runs consistency checks over 55 * structures. these checks slow things down a lot 56 */ 57 #define AGGRESSIVE_CHECK__ 58 59 /* 60 * with DOUBLE_CHECK defined mballoc creates persistent in-core 61 * bitmaps, maintains and uses them to check for double allocations 62 */ 63 #define DOUBLE_CHECK__ 64 65 /* 66 * Define EXT4FS_DEBUG to produce debug messages 67 */ 68 #undef EXT4FS_DEBUG 69 70 /* 71 * Debug code 72 */ 73 #ifdef EXT4FS_DEBUG 74 #define ext4_debug(f, a...) \ 75 do { \ 76 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 77 __FILE__, __LINE__, __func__); \ 78 printk(KERN_DEBUG f, ## a); \ 79 } while (0) 80 #else 81 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 82 #endif 83 84 /* 85 * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c 86 */ 87 #define EXT_DEBUG__ 88 89 /* 90 * Dynamic printk for controlled extents debugging. 91 */ 92 #ifdef CONFIG_EXT4_DEBUG 93 #define ext_debug(ino, fmt, ...) \ 94 pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt, \ 95 current->comm, task_pid_nr(current), \ 96 ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__, \ 97 __func__, ##__VA_ARGS__) 98 #else 99 #define ext_debug(ino, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 100 #endif 101 102 /* data type for block offset of block group */ 103 typedef int ext4_grpblk_t; 104 105 /* data type for filesystem-wide blocks number */ 106 typedef unsigned long long ext4_fsblk_t; 107 108 /* data type for file logical block number */ 109 typedef __u32 ext4_lblk_t; 110 111 /* data type for block group number */ 112 typedef unsigned int ext4_group_t; 113 114 enum SHIFT_DIRECTION { 115 SHIFT_LEFT = 0, 116 SHIFT_RIGHT, 117 }; 118 119 /* 120 * Flags used in mballoc's allocation_context flags field. 121 * 122 * Also used to show what's going on for debugging purposes when the 123 * flag field is exported via the traceport interface 124 */ 125 126 /* prefer goal again. length */ 127 #define EXT4_MB_HINT_MERGE 0x0001 128 /* blocks already reserved */ 129 #define EXT4_MB_HINT_RESERVED 0x0002 130 /* metadata is being allocated */ 131 #define EXT4_MB_HINT_METADATA 0x0004 132 /* first blocks in the file */ 133 #define EXT4_MB_HINT_FIRST 0x0008 134 /* search for the best chunk */ 135 #define EXT4_MB_HINT_BEST 0x0010 136 /* data is being allocated */ 137 #define EXT4_MB_HINT_DATA 0x0020 138 /* don't preallocate (for tails) */ 139 #define EXT4_MB_HINT_NOPREALLOC 0x0040 140 /* allocate for locality group */ 141 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 142 /* allocate goal blocks or none */ 143 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 144 /* goal is meaningful */ 145 #define EXT4_MB_HINT_TRY_GOAL 0x0200 146 /* blocks already pre-reserved by delayed allocation */ 147 #define EXT4_MB_DELALLOC_RESERVED 0x0400 148 /* We are doing stream allocation */ 149 #define EXT4_MB_STREAM_ALLOC 0x0800 150 /* Use reserved root blocks if needed */ 151 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 152 /* Use blocks from reserved pool */ 153 #define EXT4_MB_USE_RESERVED 0x2000 154 /* Do strict check for free blocks while retrying block allocation */ 155 #define EXT4_MB_STRICT_CHECK 0x4000 156 157 struct ext4_allocation_request { 158 /* target inode for block we're allocating */ 159 struct inode *inode; 160 /* how many blocks we want to allocate */ 161 unsigned int len; 162 /* logical block in target inode */ 163 ext4_lblk_t logical; 164 /* the closest logical allocated block to the left */ 165 ext4_lblk_t lleft; 166 /* the closest logical allocated block to the right */ 167 ext4_lblk_t lright; 168 /* phys. target (a hint) */ 169 ext4_fsblk_t goal; 170 /* phys. block for the closest logical allocated block to the left */ 171 ext4_fsblk_t pleft; 172 /* phys. block for the closest logical allocated block to the right */ 173 ext4_fsblk_t pright; 174 /* flags. see above EXT4_MB_HINT_* */ 175 unsigned int flags; 176 }; 177 178 /* 179 * Logical to physical block mapping, used by ext4_map_blocks() 180 * 181 * This structure is used to pass requests into ext4_map_blocks() as 182 * well as to store the information returned by ext4_map_blocks(). It 183 * takes less room on the stack than a struct buffer_head. 184 */ 185 #define EXT4_MAP_NEW BIT(BH_New) 186 #define EXT4_MAP_MAPPED BIT(BH_Mapped) 187 #define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten) 188 #define EXT4_MAP_BOUNDARY BIT(BH_Boundary) 189 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 190 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 191 192 struct ext4_map_blocks { 193 ext4_fsblk_t m_pblk; 194 ext4_lblk_t m_lblk; 195 unsigned int m_len; 196 unsigned int m_flags; 197 }; 198 199 /* 200 * Block validity checking, system zone rbtree. 201 */ 202 struct ext4_system_blocks { 203 struct rb_root root; 204 struct rcu_head rcu; 205 }; 206 207 /* 208 * Flags for ext4_io_end->flags 209 */ 210 #define EXT4_IO_END_UNWRITTEN 0x0001 211 212 struct ext4_io_end_vec { 213 struct list_head list; /* list of io_end_vec */ 214 loff_t offset; /* offset in the file */ 215 ssize_t size; /* size of the extent */ 216 }; 217 218 /* 219 * For converting unwritten extents on a work queue. 'handle' is used for 220 * buffered writeback. 221 */ 222 typedef struct ext4_io_end { 223 struct list_head list; /* per-file finished IO list */ 224 handle_t *handle; /* handle reserved for extent 225 * conversion */ 226 struct inode *inode; /* file being written to */ 227 struct bio *bio; /* Linked list of completed 228 * bios covering the extent */ 229 unsigned int flag; /* unwritten or not */ 230 atomic_t count; /* reference counter */ 231 struct list_head list_vec; /* list of ext4_io_end_vec */ 232 } ext4_io_end_t; 233 234 struct ext4_io_submit { 235 struct writeback_control *io_wbc; 236 struct bio *io_bio; 237 ext4_io_end_t *io_end; 238 sector_t io_next_block; 239 }; 240 241 /* 242 * Special inodes numbers 243 */ 244 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 245 #define EXT4_ROOT_INO 2 /* Root inode */ 246 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 247 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 248 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 249 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 250 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 251 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 252 253 /* First non-reserved inode for old ext4 filesystems */ 254 #define EXT4_GOOD_OLD_FIRST_INO 11 255 256 /* 257 * Maximal count of links to a file 258 */ 259 #define EXT4_LINK_MAX 65000 260 261 /* 262 * Macro-instructions used to manage several block sizes 263 */ 264 #define EXT4_MIN_BLOCK_SIZE 1024 265 #define EXT4_MAX_BLOCK_SIZE 65536 266 #define EXT4_MIN_BLOCK_LOG_SIZE 10 267 #define EXT4_MAX_BLOCK_LOG_SIZE 16 268 #define EXT4_MAX_CLUSTER_LOG_SIZE 30 269 #ifdef __KERNEL__ 270 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 271 #else 272 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 273 #endif 274 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 275 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 276 EXT4_SB(s)->s_cluster_bits) 277 #ifdef __KERNEL__ 278 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 279 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 280 #else 281 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 282 #endif 283 #ifdef __KERNEL__ 284 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 285 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 286 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 287 #else 288 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 289 EXT4_GOOD_OLD_INODE_SIZE : \ 290 (s)->s_inode_size) 291 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 292 EXT4_GOOD_OLD_FIRST_INO : \ 293 (s)->s_first_ino) 294 #endif 295 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 296 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \ 297 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \ 298 blkbits)) 299 300 /* Translate a block number to a cluster number */ 301 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 302 /* Translate a cluster number to a block number */ 303 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 304 /* Translate # of blks to # of clusters */ 305 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 306 (sbi)->s_cluster_bits) 307 /* Mask out the low bits to get the starting block of the cluster */ 308 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 309 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 310 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 311 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 312 /* Fill in the low bits to get the last block of the cluster */ 313 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \ 314 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1)) 315 /* Get the cluster offset */ 316 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 317 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 318 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 319 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 320 321 /* 322 * Structure of a blocks group descriptor 323 */ 324 struct ext4_group_desc 325 { 326 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 327 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 328 __le32 bg_inode_table_lo; /* Inodes table block */ 329 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 330 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 331 __le16 bg_used_dirs_count_lo; /* Directories count */ 332 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 333 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 334 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 335 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 336 __le16 bg_itable_unused_lo; /* Unused inodes count */ 337 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 338 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 339 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 340 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 341 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 342 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 343 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 344 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 345 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 346 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 347 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 348 __u32 bg_reserved; 349 }; 350 351 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 352 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 353 sizeof(__le16)) 354 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 355 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 356 sizeof(__le16)) 357 358 /* 359 * Structure of a flex block group info 360 */ 361 362 struct flex_groups { 363 atomic64_t free_clusters; 364 atomic_t free_inodes; 365 atomic_t used_dirs; 366 }; 367 368 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 369 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 370 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 371 372 /* 373 * Macro-instructions used to manage group descriptors 374 */ 375 #define EXT4_MIN_DESC_SIZE 32 376 #define EXT4_MIN_DESC_SIZE_64BIT 64 377 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 378 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 379 #ifdef __KERNEL__ 380 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 381 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 382 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 383 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 384 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 385 #else 386 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 387 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 388 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 389 #endif 390 391 /* 392 * Constants relative to the data blocks 393 */ 394 #define EXT4_NDIR_BLOCKS 12 395 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 396 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 397 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 398 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 399 400 /* 401 * Inode flags 402 */ 403 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 404 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 405 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 406 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 407 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 408 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 409 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 410 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 411 /* Reserved for compression usage... */ 412 #define EXT4_DIRTY_FL 0x00000100 413 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 414 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 415 /* nb: was previously EXT2_ECOMPR_FL */ 416 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 417 /* End compression flags --- maybe not all used */ 418 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 419 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 420 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 421 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 422 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 423 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 424 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 425 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 426 #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */ 427 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 428 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */ 429 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 430 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 431 #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */ 432 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 433 434 #define EXT4_FL_USER_VISIBLE 0x705BDFFF /* User visible flags */ 435 #define EXT4_FL_USER_MODIFIABLE 0x604BC0FF /* User modifiable flags */ 436 437 /* Flags we can manipulate with through EXT4_IOC_FSSETXATTR */ 438 #define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \ 439 EXT4_IMMUTABLE_FL | \ 440 EXT4_APPEND_FL | \ 441 EXT4_NODUMP_FL | \ 442 EXT4_NOATIME_FL | \ 443 EXT4_PROJINHERIT_FL) 444 445 /* Flags that should be inherited by new inodes from their parent. */ 446 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 447 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 448 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 449 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 450 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL) 451 452 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 453 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\ 454 EXT4_PROJINHERIT_FL)) 455 456 /* Flags that are appropriate for non-directories/regular files. */ 457 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 458 459 /* The only flags that should be swapped */ 460 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL) 461 462 /* Mask out flags that are inappropriate for the given type of inode. */ 463 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 464 { 465 if (S_ISDIR(mode)) 466 return flags; 467 else if (S_ISREG(mode)) 468 return flags & EXT4_REG_FLMASK; 469 else 470 return flags & EXT4_OTHER_FLMASK; 471 } 472 473 /* 474 * Inode flags used for atomic set/get 475 */ 476 enum { 477 EXT4_INODE_SECRM = 0, /* Secure deletion */ 478 EXT4_INODE_UNRM = 1, /* Undelete */ 479 EXT4_INODE_COMPR = 2, /* Compress file */ 480 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 481 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 482 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 483 EXT4_INODE_NODUMP = 6, /* do not dump file */ 484 EXT4_INODE_NOATIME = 7, /* do not update atime */ 485 /* Reserved for compression usage... */ 486 EXT4_INODE_DIRTY = 8, 487 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 488 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 489 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 490 /* End compression flags --- maybe not all used */ 491 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 492 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 493 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 494 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 495 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 496 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 497 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 498 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 499 EXT4_INODE_VERITY = 20, /* Verity protected inode */ 500 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 501 /* 22 was formerly EXT4_INODE_EOFBLOCKS */ 502 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 503 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 504 EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */ 505 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 506 }; 507 508 /* 509 * Since it's pretty easy to mix up bit numbers and hex values, we use a 510 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 511 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 512 * any extra space in the compiled kernel image, otherwise, the build will fail. 513 * It's important that these values are the same, since we are using 514 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 515 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 516 * values found in ext2, ext3 and ext4 filesystems, and of course the values 517 * defined in e2fsprogs. 518 * 519 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 520 */ 521 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 522 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 523 524 static inline void ext4_check_flag_values(void) 525 { 526 CHECK_FLAG_VALUE(SECRM); 527 CHECK_FLAG_VALUE(UNRM); 528 CHECK_FLAG_VALUE(COMPR); 529 CHECK_FLAG_VALUE(SYNC); 530 CHECK_FLAG_VALUE(IMMUTABLE); 531 CHECK_FLAG_VALUE(APPEND); 532 CHECK_FLAG_VALUE(NODUMP); 533 CHECK_FLAG_VALUE(NOATIME); 534 CHECK_FLAG_VALUE(DIRTY); 535 CHECK_FLAG_VALUE(COMPRBLK); 536 CHECK_FLAG_VALUE(NOCOMPR); 537 CHECK_FLAG_VALUE(ENCRYPT); 538 CHECK_FLAG_VALUE(INDEX); 539 CHECK_FLAG_VALUE(IMAGIC); 540 CHECK_FLAG_VALUE(JOURNAL_DATA); 541 CHECK_FLAG_VALUE(NOTAIL); 542 CHECK_FLAG_VALUE(DIRSYNC); 543 CHECK_FLAG_VALUE(TOPDIR); 544 CHECK_FLAG_VALUE(HUGE_FILE); 545 CHECK_FLAG_VALUE(EXTENTS); 546 CHECK_FLAG_VALUE(VERITY); 547 CHECK_FLAG_VALUE(EA_INODE); 548 CHECK_FLAG_VALUE(INLINE_DATA); 549 CHECK_FLAG_VALUE(PROJINHERIT); 550 CHECK_FLAG_VALUE(CASEFOLD); 551 CHECK_FLAG_VALUE(RESERVED); 552 } 553 554 /* Used to pass group descriptor data when online resize is done */ 555 struct ext4_new_group_input { 556 __u32 group; /* Group number for this data */ 557 __u64 block_bitmap; /* Absolute block number of block bitmap */ 558 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 559 __u64 inode_table; /* Absolute block number of inode table start */ 560 __u32 blocks_count; /* Total number of blocks in this group */ 561 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 562 __u16 unused; 563 }; 564 565 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 566 struct compat_ext4_new_group_input { 567 u32 group; 568 compat_u64 block_bitmap; 569 compat_u64 inode_bitmap; 570 compat_u64 inode_table; 571 u32 blocks_count; 572 u16 reserved_blocks; 573 u16 unused; 574 }; 575 #endif 576 577 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 578 struct ext4_new_group_data { 579 __u32 group; 580 __u64 block_bitmap; 581 __u64 inode_bitmap; 582 __u64 inode_table; 583 __u32 blocks_count; 584 __u16 reserved_blocks; 585 __u16 mdata_blocks; 586 __u32 free_clusters_count; 587 }; 588 589 /* Indexes used to index group tables in ext4_new_group_data */ 590 enum { 591 BLOCK_BITMAP = 0, /* block bitmap */ 592 INODE_BITMAP, /* inode bitmap */ 593 INODE_TABLE, /* inode tables */ 594 GROUP_TABLE_COUNT, 595 }; 596 597 /* 598 * Flags used by ext4_map_blocks() 599 */ 600 /* Allocate any needed blocks and/or convert an unwritten 601 extent to be an initialized ext4 */ 602 #define EXT4_GET_BLOCKS_CREATE 0x0001 603 /* Request the creation of an unwritten extent */ 604 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 605 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 606 EXT4_GET_BLOCKS_CREATE) 607 /* Caller is from the delayed allocation writeout path 608 * finally doing the actual allocation of delayed blocks */ 609 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 610 /* caller is from the direct IO path, request to creation of an 611 unwritten extents if not allocated, split the unwritten 612 extent if blocks has been preallocated already*/ 613 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 614 #define EXT4_GET_BLOCKS_CONVERT 0x0010 615 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 616 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 617 /* Convert extent to initialized after IO complete */ 618 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 619 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 620 /* Eventual metadata allocation (due to growing extent tree) 621 * should not fail, so try to use reserved blocks for that.*/ 622 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 623 /* Don't normalize allocation size (used for fallocate) */ 624 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 625 /* Convert written extents to unwritten */ 626 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 627 /* Write zeros to newly created written extents */ 628 #define EXT4_GET_BLOCKS_ZERO 0x0200 629 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 630 EXT4_GET_BLOCKS_ZERO) 631 /* Caller will submit data before dropping transaction handle. This 632 * allows jbd2 to avoid submitting data before commit. */ 633 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 634 635 /* 636 * The bit position of these flags must not overlap with any of the 637 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 638 * read_extent_tree_block(), ext4_split_extent_at(), 639 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 640 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 641 * caching the extents when reading from the extent tree while a 642 * truncate or punch hole operation is in progress. 643 */ 644 #define EXT4_EX_NOCACHE 0x40000000 645 #define EXT4_EX_FORCE_CACHE 0x20000000 646 #define EXT4_EX_NOFAIL 0x10000000 647 648 /* 649 * Flags used by ext4_free_blocks 650 */ 651 #define EXT4_FREE_BLOCKS_METADATA 0x0001 652 #define EXT4_FREE_BLOCKS_FORGET 0x0002 653 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 654 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 655 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 656 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 657 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040 658 659 /* 660 * ioctl commands 661 */ 662 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 663 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 664 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 665 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 666 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 667 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 668 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 669 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 670 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 671 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 672 #define EXT4_IOC_MIGRATE _IO('f', 9) 673 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 674 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 675 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 676 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 677 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 678 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 679 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 680 #define EXT4_IOC_SET_ENCRYPTION_POLICY FS_IOC_SET_ENCRYPTION_POLICY 681 #define EXT4_IOC_GET_ENCRYPTION_PWSALT FS_IOC_GET_ENCRYPTION_PWSALT 682 #define EXT4_IOC_GET_ENCRYPTION_POLICY FS_IOC_GET_ENCRYPTION_POLICY 683 /* ioctl codes 19--39 are reserved for fscrypt */ 684 #define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40) 685 #define EXT4_IOC_GETSTATE _IOW('f', 41, __u32) 686 #define EXT4_IOC_GET_ES_CACHE _IOWR('f', 42, struct fiemap) 687 688 #define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR 689 #define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR 690 691 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32) 692 693 /* 694 * Flags for going down operation 695 */ 696 #define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */ 697 #define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */ 698 #define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */ 699 700 /* 701 * Flags returned by EXT4_IOC_GETSTATE 702 * 703 * We only expose to userspace a subset of the state flags in 704 * i_state_flags 705 */ 706 #define EXT4_STATE_FLAG_EXT_PRECACHED 0x00000001 707 #define EXT4_STATE_FLAG_NEW 0x00000002 708 #define EXT4_STATE_FLAG_NEWENTRY 0x00000004 709 #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE 0x00000008 710 711 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 712 /* 713 * ioctl commands in 32 bit emulation 714 */ 715 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 716 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 717 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 718 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 719 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 720 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 721 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 722 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 723 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 724 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 725 #endif 726 727 /* 728 * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag. 729 * It indicates that the entry in extent status cache is for a hole. 730 */ 731 #define EXT4_FIEMAP_EXTENT_HOLE 0x08000000 732 733 /* Max physical block we can address w/o extents */ 734 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 735 736 /* Max logical block we can support */ 737 #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE 738 739 /* 740 * Structure of an inode on the disk 741 */ 742 struct ext4_inode { 743 __le16 i_mode; /* File mode */ 744 __le16 i_uid; /* Low 16 bits of Owner Uid */ 745 __le32 i_size_lo; /* Size in bytes */ 746 __le32 i_atime; /* Access time */ 747 __le32 i_ctime; /* Inode Change time */ 748 __le32 i_mtime; /* Modification time */ 749 __le32 i_dtime; /* Deletion Time */ 750 __le16 i_gid; /* Low 16 bits of Group Id */ 751 __le16 i_links_count; /* Links count */ 752 __le32 i_blocks_lo; /* Blocks count */ 753 __le32 i_flags; /* File flags */ 754 union { 755 struct { 756 __le32 l_i_version; 757 } linux1; 758 struct { 759 __u32 h_i_translator; 760 } hurd1; 761 struct { 762 __u32 m_i_reserved1; 763 } masix1; 764 } osd1; /* OS dependent 1 */ 765 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 766 __le32 i_generation; /* File version (for NFS) */ 767 __le32 i_file_acl_lo; /* File ACL */ 768 __le32 i_size_high; 769 __le32 i_obso_faddr; /* Obsoleted fragment address */ 770 union { 771 struct { 772 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 773 __le16 l_i_file_acl_high; 774 __le16 l_i_uid_high; /* these 2 fields */ 775 __le16 l_i_gid_high; /* were reserved2[0] */ 776 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 777 __le16 l_i_reserved; 778 } linux2; 779 struct { 780 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 781 __u16 h_i_mode_high; 782 __u16 h_i_uid_high; 783 __u16 h_i_gid_high; 784 __u32 h_i_author; 785 } hurd2; 786 struct { 787 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 788 __le16 m_i_file_acl_high; 789 __u32 m_i_reserved2[2]; 790 } masix2; 791 } osd2; /* OS dependent 2 */ 792 __le16 i_extra_isize; 793 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 794 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 795 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 796 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 797 __le32 i_crtime; /* File Creation time */ 798 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 799 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 800 __le32 i_projid; /* Project ID */ 801 }; 802 803 struct move_extent { 804 __u32 reserved; /* should be zero */ 805 __u32 donor_fd; /* donor file descriptor */ 806 __u64 orig_start; /* logical start offset in block for orig */ 807 __u64 donor_start; /* logical start offset in block for donor */ 808 __u64 len; /* block length to be moved */ 809 __u64 moved_len; /* moved block length */ 810 }; 811 812 #define EXT4_EPOCH_BITS 2 813 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 814 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 815 816 /* 817 * Extended fields will fit into an inode if the filesystem was formatted 818 * with large inodes (-I 256 or larger) and there are not currently any EAs 819 * consuming all of the available space. For new inodes we always reserve 820 * enough space for the kernel's known extended fields, but for inodes 821 * created with an old kernel this might not have been the case. None of 822 * the extended inode fields is critical for correct filesystem operation. 823 * This macro checks if a certain field fits in the inode. Note that 824 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 825 */ 826 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 827 ((offsetof(typeof(*ext4_inode), field) + \ 828 sizeof((ext4_inode)->field)) \ 829 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 830 (einode)->i_extra_isize)) \ 831 832 /* 833 * We use an encoding that preserves the times for extra epoch "00": 834 * 835 * extra msb of adjust for signed 836 * epoch 32-bit 32-bit tv_sec to 837 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 838 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 839 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 840 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 841 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 842 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 843 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 844 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 845 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 846 * 847 * Note that previous versions of the kernel on 64-bit systems would 848 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 849 * 1970. e2fsck will correct this, assuming that it is run on the 850 * affected filesystem before 2242. 851 */ 852 853 static inline __le32 ext4_encode_extra_time(struct timespec64 *time) 854 { 855 u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK; 856 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); 857 } 858 859 static inline void ext4_decode_extra_time(struct timespec64 *time, 860 __le32 extra) 861 { 862 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) 863 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 864 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 865 } 866 867 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 868 do { \ 869 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\ 870 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 871 (raw_inode)->xtime ## _extra = \ 872 ext4_encode_extra_time(&(inode)->xtime); \ 873 } \ 874 else \ 875 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX)); \ 876 } while (0) 877 878 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 879 do { \ 880 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 881 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 882 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 883 (raw_inode)->xtime ## _extra = \ 884 ext4_encode_extra_time(&(einode)->xtime); \ 885 } while (0) 886 887 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 888 do { \ 889 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 890 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \ 891 ext4_decode_extra_time(&(inode)->xtime, \ 892 raw_inode->xtime ## _extra); \ 893 } \ 894 else \ 895 (inode)->xtime.tv_nsec = 0; \ 896 } while (0) 897 898 899 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 900 do { \ 901 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 902 (einode)->xtime.tv_sec = \ 903 (signed)le32_to_cpu((raw_inode)->xtime); \ 904 else \ 905 (einode)->xtime.tv_sec = 0; \ 906 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 907 ext4_decode_extra_time(&(einode)->xtime, \ 908 raw_inode->xtime ## _extra); \ 909 else \ 910 (einode)->xtime.tv_nsec = 0; \ 911 } while (0) 912 913 #define i_disk_version osd1.linux1.l_i_version 914 915 #if defined(__KERNEL__) || defined(__linux__) 916 #define i_reserved1 osd1.linux1.l_i_reserved1 917 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 918 #define i_blocks_high osd2.linux2.l_i_blocks_high 919 #define i_uid_low i_uid 920 #define i_gid_low i_gid 921 #define i_uid_high osd2.linux2.l_i_uid_high 922 #define i_gid_high osd2.linux2.l_i_gid_high 923 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 924 925 #elif defined(__GNU__) 926 927 #define i_translator osd1.hurd1.h_i_translator 928 #define i_uid_high osd2.hurd2.h_i_uid_high 929 #define i_gid_high osd2.hurd2.h_i_gid_high 930 #define i_author osd2.hurd2.h_i_author 931 932 #elif defined(__masix__) 933 934 #define i_reserved1 osd1.masix1.m_i_reserved1 935 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 936 #define i_reserved2 osd2.masix2.m_i_reserved2 937 938 #endif /* defined(__KERNEL__) || defined(__linux__) */ 939 940 #include "extents_status.h" 941 942 /* 943 * Lock subclasses for i_data_sem in the ext4_inode_info structure. 944 * 945 * These are needed to avoid lockdep false positives when we need to 946 * allocate blocks to the quota inode during ext4_map_blocks(), while 947 * holding i_data_sem for a normal (non-quota) inode. Since we don't 948 * do quota tracking for the quota inode, this avoids deadlock (as 949 * well as infinite recursion, since it isn't turtles all the way 950 * down...) 951 * 952 * I_DATA_SEM_NORMAL - Used for most inodes 953 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode 954 * where the second inode has larger inode number 955 * than the first 956 * I_DATA_SEM_QUOTA - Used for quota inodes only 957 */ 958 enum { 959 I_DATA_SEM_NORMAL = 0, 960 I_DATA_SEM_OTHER, 961 I_DATA_SEM_QUOTA, 962 }; 963 964 965 /* 966 * fourth extended file system inode data in memory 967 */ 968 struct ext4_inode_info { 969 __le32 i_data[15]; /* unconverted */ 970 __u32 i_dtime; 971 ext4_fsblk_t i_file_acl; 972 973 /* 974 * i_block_group is the number of the block group which contains 975 * this file's inode. Constant across the lifetime of the inode, 976 * it is used for making block allocation decisions - we try to 977 * place a file's data blocks near its inode block, and new inodes 978 * near to their parent directory's inode. 979 */ 980 ext4_group_t i_block_group; 981 ext4_lblk_t i_dir_start_lookup; 982 #if (BITS_PER_LONG < 64) 983 unsigned long i_state_flags; /* Dynamic state flags */ 984 #endif 985 unsigned long i_flags; 986 987 /* 988 * Extended attributes can be read independently of the main file 989 * data. Taking i_mutex even when reading would cause contention 990 * between readers of EAs and writers of regular file data, so 991 * instead we synchronize on xattr_sem when reading or changing 992 * EAs. 993 */ 994 struct rw_semaphore xattr_sem; 995 996 struct list_head i_orphan; /* unlinked but open inodes */ 997 998 /* 999 * i_disksize keeps track of what the inode size is ON DISK, not 1000 * in memory. During truncate, i_size is set to the new size by 1001 * the VFS prior to calling ext4_truncate(), but the filesystem won't 1002 * set i_disksize to 0 until the truncate is actually under way. 1003 * 1004 * The intent is that i_disksize always represents the blocks which 1005 * are used by this file. This allows recovery to restart truncate 1006 * on orphans if we crash during truncate. We actually write i_disksize 1007 * into the on-disk inode when writing inodes out, instead of i_size. 1008 * 1009 * The only time when i_disksize and i_size may be different is when 1010 * a truncate is in progress. The only things which change i_disksize 1011 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 1012 */ 1013 loff_t i_disksize; 1014 1015 /* 1016 * i_data_sem is for serialising ext4_truncate() against 1017 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 1018 * data tree are chopped off during truncate. We can't do that in 1019 * ext4 because whenever we perform intermediate commits during 1020 * truncate, the inode and all the metadata blocks *must* be in a 1021 * consistent state which allows truncation of the orphans to restart 1022 * during recovery. Hence we must fix the get_block-vs-truncate race 1023 * by other means, so we have i_data_sem. 1024 */ 1025 struct rw_semaphore i_data_sem; 1026 /* 1027 * i_mmap_sem is for serializing page faults with truncate / punch hole 1028 * operations. We have to make sure that new page cannot be faulted in 1029 * a section of the inode that is being punched. We cannot easily use 1030 * i_data_sem for this since we need protection for the whole punch 1031 * operation and i_data_sem ranks below transaction start so we have 1032 * to occasionally drop it. 1033 */ 1034 struct rw_semaphore i_mmap_sem; 1035 struct inode vfs_inode; 1036 struct jbd2_inode *jinode; 1037 1038 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 1039 1040 /* 1041 * File creation time. Its function is same as that of 1042 * struct timespec64 i_{a,c,m}time in the generic inode. 1043 */ 1044 struct timespec64 i_crtime; 1045 1046 /* mballoc */ 1047 struct list_head i_prealloc_list; 1048 spinlock_t i_prealloc_lock; 1049 1050 /* extents status tree */ 1051 struct ext4_es_tree i_es_tree; 1052 rwlock_t i_es_lock; 1053 struct list_head i_es_list; 1054 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1055 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1056 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1057 extents to shrink. Protected by 1058 i_es_lock */ 1059 1060 /* ialloc */ 1061 ext4_group_t i_last_alloc_group; 1062 1063 /* allocation reservation info for delalloc */ 1064 /* In case of bigalloc, this refer to clusters rather than blocks */ 1065 unsigned int i_reserved_data_blocks; 1066 1067 /* pending cluster reservations for bigalloc file systems */ 1068 struct ext4_pending_tree i_pending_tree; 1069 1070 /* on-disk additional length */ 1071 __u16 i_extra_isize; 1072 1073 /* Indicate the inline data space. */ 1074 u16 i_inline_off; 1075 u16 i_inline_size; 1076 1077 #ifdef CONFIG_QUOTA 1078 /* quota space reservation, managed internally by quota code */ 1079 qsize_t i_reserved_quota; 1080 #endif 1081 1082 /* Lock protecting lists below */ 1083 spinlock_t i_completed_io_lock; 1084 /* 1085 * Completed IOs that need unwritten extents handling and have 1086 * transaction reserved 1087 */ 1088 struct list_head i_rsv_conversion_list; 1089 struct work_struct i_rsv_conversion_work; 1090 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 1091 1092 spinlock_t i_block_reservation_lock; 1093 1094 /* 1095 * Transactions that contain inode's metadata needed to complete 1096 * fsync and fdatasync, respectively. 1097 */ 1098 tid_t i_sync_tid; 1099 tid_t i_datasync_tid; 1100 1101 #ifdef CONFIG_QUOTA 1102 struct dquot *i_dquot[MAXQUOTAS]; 1103 #endif 1104 1105 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1106 __u32 i_csum_seed; 1107 1108 kprojid_t i_projid; 1109 }; 1110 1111 /* 1112 * File system states 1113 */ 1114 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1115 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1116 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1117 1118 /* 1119 * Misc. filesystem flags 1120 */ 1121 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1122 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1123 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1124 1125 /* 1126 * Mount flags set via mount options or defaults 1127 */ 1128 #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */ 1129 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1130 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1131 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1132 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1133 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1134 #define EXT4_MOUNT_ERRORS_MASK 0x00070 1135 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1136 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1137 #ifdef CONFIG_FS_DAX 1138 #define EXT4_MOUNT_DAX 0x00200 /* Direct Access */ 1139 #else 1140 #define EXT4_MOUNT_DAX 0 1141 #endif 1142 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1143 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1144 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1145 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1146 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1147 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1148 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1149 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1150 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1151 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1152 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */ 1153 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota, 1154 * enable enforcement for hidden 1155 * quota files */ 1156 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable 1157 * enforcement for hidden quota 1158 * files */ 1159 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota 1160 * enforcement */ 1161 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1162 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1163 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1164 #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */ 1165 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1166 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1167 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1168 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1169 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1170 1171 /* 1172 * Mount flags set either automatically (could not be set by mount option) 1173 * based on per file system feature or property or in special cases such as 1174 * distinguishing between explicit mount option definition and default. 1175 */ 1176 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1177 specified delalloc */ 1178 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1179 size of blocksize * 8 1180 blocks */ 1181 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1182 file systems */ 1183 1184 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1185 specified journal checksum */ 1186 1187 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1188 ~EXT4_MOUNT_##opt 1189 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1190 EXT4_MOUNT_##opt 1191 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1192 EXT4_MOUNT_##opt) 1193 1194 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1195 ~EXT4_MOUNT2_##opt 1196 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1197 EXT4_MOUNT2_##opt 1198 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1199 EXT4_MOUNT2_##opt) 1200 1201 #define ext4_test_and_set_bit __test_and_set_bit_le 1202 #define ext4_set_bit __set_bit_le 1203 #define ext4_set_bit_atomic ext2_set_bit_atomic 1204 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1205 #define ext4_clear_bit __clear_bit_le 1206 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1207 #define ext4_test_bit test_bit_le 1208 #define ext4_find_next_zero_bit find_next_zero_bit_le 1209 #define ext4_find_next_bit find_next_bit_le 1210 1211 extern void ext4_set_bits(void *bm, int cur, int len); 1212 1213 /* 1214 * Maximal mount counts between two filesystem checks 1215 */ 1216 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1217 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1218 1219 /* 1220 * Behaviour when detecting errors 1221 */ 1222 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1223 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1224 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1225 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1226 1227 /* Metadata checksum algorithm codes */ 1228 #define EXT4_CRC32C_CHKSUM 1 1229 1230 /* 1231 * Structure of the super block 1232 */ 1233 struct ext4_super_block { 1234 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1235 __le32 s_blocks_count_lo; /* Blocks count */ 1236 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1237 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1238 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1239 __le32 s_first_data_block; /* First Data Block */ 1240 __le32 s_log_block_size; /* Block size */ 1241 __le32 s_log_cluster_size; /* Allocation cluster size */ 1242 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1243 __le32 s_clusters_per_group; /* # Clusters per group */ 1244 __le32 s_inodes_per_group; /* # Inodes per group */ 1245 __le32 s_mtime; /* Mount time */ 1246 /*30*/ __le32 s_wtime; /* Write time */ 1247 __le16 s_mnt_count; /* Mount count */ 1248 __le16 s_max_mnt_count; /* Maximal mount count */ 1249 __le16 s_magic; /* Magic signature */ 1250 __le16 s_state; /* File system state */ 1251 __le16 s_errors; /* Behaviour when detecting errors */ 1252 __le16 s_minor_rev_level; /* minor revision level */ 1253 /*40*/ __le32 s_lastcheck; /* time of last check */ 1254 __le32 s_checkinterval; /* max. time between checks */ 1255 __le32 s_creator_os; /* OS */ 1256 __le32 s_rev_level; /* Revision level */ 1257 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1258 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1259 /* 1260 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1261 * 1262 * Note: the difference between the compatible feature set and 1263 * the incompatible feature set is that if there is a bit set 1264 * in the incompatible feature set that the kernel doesn't 1265 * know about, it should refuse to mount the filesystem. 1266 * 1267 * e2fsck's requirements are more strict; if it doesn't know 1268 * about a feature in either the compatible or incompatible 1269 * feature set, it must abort and not try to meddle with 1270 * things it doesn't understand... 1271 */ 1272 __le32 s_first_ino; /* First non-reserved inode */ 1273 __le16 s_inode_size; /* size of inode structure */ 1274 __le16 s_block_group_nr; /* block group # of this superblock */ 1275 __le32 s_feature_compat; /* compatible feature set */ 1276 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1277 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1278 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1279 /*78*/ char s_volume_name[16]; /* volume name */ 1280 /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */ 1281 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1282 /* 1283 * Performance hints. Directory preallocation should only 1284 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1285 */ 1286 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1287 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1288 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1289 /* 1290 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1291 */ 1292 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1293 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1294 __le32 s_journal_dev; /* device number of journal file */ 1295 __le32 s_last_orphan; /* start of list of inodes to delete */ 1296 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1297 __u8 s_def_hash_version; /* Default hash version to use */ 1298 __u8 s_jnl_backup_type; 1299 __le16 s_desc_size; /* size of group descriptor */ 1300 /*100*/ __le32 s_default_mount_opts; 1301 __le32 s_first_meta_bg; /* First metablock block group */ 1302 __le32 s_mkfs_time; /* When the filesystem was created */ 1303 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1304 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1305 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1306 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1307 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1308 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1309 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1310 __le32 s_flags; /* Miscellaneous flags */ 1311 __le16 s_raid_stride; /* RAID stride */ 1312 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1313 __le64 s_mmp_block; /* Block for multi-mount protection */ 1314 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1315 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1316 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1317 __u8 s_encryption_level; /* versioning level for encryption */ 1318 __u8 s_reserved_pad; /* Padding to next 32bits */ 1319 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1320 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1321 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1322 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1323 snapshot's future use */ 1324 __le32 s_snapshot_list; /* inode number of the head of the 1325 on-disk snapshot list */ 1326 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1327 __le32 s_error_count; /* number of fs errors */ 1328 __le32 s_first_error_time; /* first time an error happened */ 1329 __le32 s_first_error_ino; /* inode involved in first error */ 1330 __le64 s_first_error_block; /* block involved of first error */ 1331 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */ 1332 __le32 s_first_error_line; /* line number where error happened */ 1333 __le32 s_last_error_time; /* most recent time of an error */ 1334 __le32 s_last_error_ino; /* inode involved in last error */ 1335 __le32 s_last_error_line; /* line number where error happened */ 1336 __le64 s_last_error_block; /* block involved of last error */ 1337 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */ 1338 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1339 __u8 s_mount_opts[64]; 1340 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1341 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1342 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1343 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1344 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1345 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1346 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1347 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1348 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1349 __u8 s_wtime_hi; 1350 __u8 s_mtime_hi; 1351 __u8 s_mkfs_time_hi; 1352 __u8 s_lastcheck_hi; 1353 __u8 s_first_error_time_hi; 1354 __u8 s_last_error_time_hi; 1355 __u8 s_first_error_errcode; 1356 __u8 s_last_error_errcode; 1357 __le16 s_encoding; /* Filename charset encoding */ 1358 __le16 s_encoding_flags; /* Filename charset encoding flags */ 1359 __le32 s_reserved[95]; /* Padding to the end of the block */ 1360 __le32 s_checksum; /* crc32c(superblock) */ 1361 }; 1362 1363 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1364 1365 #ifdef __KERNEL__ 1366 1367 /* 1368 * run-time mount flags 1369 */ 1370 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1371 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1372 1373 #ifdef CONFIG_FS_ENCRYPTION 1374 #define DUMMY_ENCRYPTION_ENABLED(sbi) ((sbi)->s_dummy_enc_ctx.ctx != NULL) 1375 #else 1376 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0) 1377 #endif 1378 1379 /* Number of quota types we support */ 1380 #define EXT4_MAXQUOTAS 3 1381 1382 #define EXT4_ENC_UTF8_12_1 1 1383 1384 /* 1385 * Flags for ext4_sb_info.s_encoding_flags. 1386 */ 1387 #define EXT4_ENC_STRICT_MODE_FL (1 << 0) 1388 1389 #define ext4_has_strict_mode(sbi) \ 1390 (sbi->s_encoding_flags & EXT4_ENC_STRICT_MODE_FL) 1391 1392 /* 1393 * fourth extended-fs super-block data in memory 1394 */ 1395 struct ext4_sb_info { 1396 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1397 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1398 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1399 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1400 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1401 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1402 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1403 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1404 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1405 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1406 unsigned long s_overhead; /* # of fs overhead clusters */ 1407 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1408 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1409 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1410 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1411 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1412 struct buffer_head * __rcu *s_group_desc; 1413 unsigned int s_mount_opt; 1414 unsigned int s_mount_opt2; 1415 unsigned int s_mount_flags; 1416 unsigned int s_def_mount_opt; 1417 ext4_fsblk_t s_sb_block; 1418 atomic64_t s_resv_clusters; 1419 kuid_t s_resuid; 1420 kgid_t s_resgid; 1421 unsigned short s_mount_state; 1422 unsigned short s_pad; 1423 int s_addr_per_block_bits; 1424 int s_desc_per_block_bits; 1425 int s_inode_size; 1426 int s_first_ino; 1427 unsigned int s_inode_readahead_blks; 1428 unsigned int s_inode_goal; 1429 u32 s_hash_seed[4]; 1430 int s_def_hash_version; 1431 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1432 struct percpu_counter s_freeclusters_counter; 1433 struct percpu_counter s_freeinodes_counter; 1434 struct percpu_counter s_dirs_counter; 1435 struct percpu_counter s_dirtyclusters_counter; 1436 struct blockgroup_lock *s_blockgroup_lock; 1437 struct proc_dir_entry *s_proc; 1438 struct kobject s_kobj; 1439 struct completion s_kobj_unregister; 1440 struct super_block *s_sb; 1441 #ifdef CONFIG_UNICODE 1442 struct unicode_map *s_encoding; 1443 __u16 s_encoding_flags; 1444 #endif 1445 1446 /* Journaling */ 1447 struct journal_s *s_journal; 1448 struct list_head s_orphan; 1449 struct mutex s_orphan_lock; 1450 unsigned long s_ext4_flags; /* Ext4 superblock flags */ 1451 unsigned long s_commit_interval; 1452 u32 s_max_batch_time; 1453 u32 s_min_batch_time; 1454 struct block_device *journal_bdev; 1455 #ifdef CONFIG_QUOTA 1456 /* Names of quota files with journalled quota */ 1457 char __rcu *s_qf_names[EXT4_MAXQUOTAS]; 1458 int s_jquota_fmt; /* Format of quota to use */ 1459 #endif 1460 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1461 struct ext4_system_blocks __rcu *system_blks; 1462 1463 #ifdef EXTENTS_STATS 1464 /* ext4 extents stats */ 1465 unsigned long s_ext_min; 1466 unsigned long s_ext_max; 1467 unsigned long s_depth_max; 1468 spinlock_t s_ext_stats_lock; 1469 unsigned long s_ext_blocks; 1470 unsigned long s_ext_extents; 1471 #endif 1472 1473 /* for buddy allocator */ 1474 struct ext4_group_info ** __rcu *s_group_info; 1475 struct inode *s_buddy_cache; 1476 spinlock_t s_md_lock; 1477 unsigned short *s_mb_offsets; 1478 unsigned int *s_mb_maxs; 1479 unsigned int s_group_info_size; 1480 unsigned int s_mb_free_pending; 1481 struct list_head s_freed_data_list; /* List of blocks to be freed 1482 after commit completed */ 1483 1484 /* tunables */ 1485 unsigned long s_stripe; 1486 unsigned int s_mb_stream_request; 1487 unsigned int s_mb_max_to_scan; 1488 unsigned int s_mb_min_to_scan; 1489 unsigned int s_mb_stats; 1490 unsigned int s_mb_order2_reqs; 1491 unsigned int s_mb_group_prealloc; 1492 unsigned int s_max_dir_size_kb; 1493 /* where last allocation was done - for stream allocation */ 1494 unsigned long s_mb_last_group; 1495 unsigned long s_mb_last_start; 1496 1497 /* stats for buddy allocator */ 1498 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1499 atomic_t s_bal_success; /* we found long enough chunks */ 1500 atomic_t s_bal_allocated; /* in blocks */ 1501 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1502 atomic_t s_bal_goals; /* goal hits */ 1503 atomic_t s_bal_breaks; /* too long searches */ 1504 atomic_t s_bal_2orders; /* 2^order hits */ 1505 spinlock_t s_bal_lock; 1506 unsigned long s_mb_buddies_generated; 1507 unsigned long long s_mb_generation_time; 1508 atomic_t s_mb_lost_chunks; 1509 atomic_t s_mb_preallocated; 1510 atomic_t s_mb_discarded; 1511 atomic_t s_lock_busy; 1512 1513 /* locality groups */ 1514 struct ext4_locality_group __percpu *s_locality_groups; 1515 1516 /* for write statistics */ 1517 unsigned long s_sectors_written_start; 1518 u64 s_kbytes_written; 1519 1520 /* the size of zero-out chunk */ 1521 unsigned int s_extent_max_zeroout_kb; 1522 1523 unsigned int s_log_groups_per_flex; 1524 struct flex_groups * __rcu *s_flex_groups; 1525 ext4_group_t s_flex_groups_allocated; 1526 1527 /* workqueue for reserved extent conversions (buffered io) */ 1528 struct workqueue_struct *rsv_conversion_wq; 1529 1530 /* timer for periodic error stats printing */ 1531 struct timer_list s_err_report; 1532 1533 /* Lazy inode table initialization info */ 1534 struct ext4_li_request *s_li_request; 1535 /* Wait multiplier for lazy initialization thread */ 1536 unsigned int s_li_wait_mult; 1537 1538 /* Kernel thread for multiple mount protection */ 1539 struct task_struct *s_mmp_tsk; 1540 1541 /* record the last minlen when FITRIM is called. */ 1542 atomic_t s_last_trim_minblks; 1543 1544 /* Reference to checksum algorithm driver via cryptoapi */ 1545 struct crypto_shash *s_chksum_driver; 1546 1547 /* Precomputed FS UUID checksum for seeding other checksums */ 1548 __u32 s_csum_seed; 1549 1550 /* Reclaim extents from extent status tree */ 1551 struct shrinker s_es_shrinker; 1552 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1553 long s_es_nr_inode; 1554 struct ext4_es_stats s_es_stats; 1555 struct mb_cache *s_ea_block_cache; 1556 struct mb_cache *s_ea_inode_cache; 1557 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1558 1559 /* Ratelimit ext4 messages. */ 1560 struct ratelimit_state s_err_ratelimit_state; 1561 struct ratelimit_state s_warning_ratelimit_state; 1562 struct ratelimit_state s_msg_ratelimit_state; 1563 1564 /* Encryption context for '-o test_dummy_encryption' */ 1565 struct fscrypt_dummy_context s_dummy_enc_ctx; 1566 1567 /* 1568 * Barrier between writepages ops and changing any inode's JOURNAL_DATA 1569 * or EXTENTS flag. 1570 */ 1571 struct percpu_rw_semaphore s_writepages_rwsem; 1572 struct dax_device *s_daxdev; 1573 #ifdef CONFIG_EXT4_DEBUG 1574 unsigned long s_simulate_fail; 1575 #endif 1576 }; 1577 1578 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1579 { 1580 return sb->s_fs_info; 1581 } 1582 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1583 { 1584 return container_of(inode, struct ext4_inode_info, vfs_inode); 1585 } 1586 1587 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1588 { 1589 return ino == EXT4_ROOT_INO || 1590 (ino >= EXT4_FIRST_INO(sb) && 1591 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1592 } 1593 1594 /* 1595 * Returns: sbi->field[index] 1596 * Used to access an array element from the following sbi fields which require 1597 * rcu protection to avoid dereferencing an invalid pointer due to reassignment 1598 * - s_group_desc 1599 * - s_group_info 1600 * - s_flex_group 1601 */ 1602 #define sbi_array_rcu_deref(sbi, field, index) \ 1603 ({ \ 1604 typeof(*((sbi)->field)) _v; \ 1605 rcu_read_lock(); \ 1606 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \ 1607 rcu_read_unlock(); \ 1608 _v; \ 1609 }) 1610 1611 /* 1612 * Simulate_fail codes 1613 */ 1614 #define EXT4_SIM_BBITMAP_EIO 1 1615 #define EXT4_SIM_BBITMAP_CRC 2 1616 #define EXT4_SIM_IBITMAP_EIO 3 1617 #define EXT4_SIM_IBITMAP_CRC 4 1618 #define EXT4_SIM_INODE_EIO 5 1619 #define EXT4_SIM_INODE_CRC 6 1620 #define EXT4_SIM_DIRBLOCK_EIO 7 1621 #define EXT4_SIM_DIRBLOCK_CRC 8 1622 1623 static inline bool ext4_simulate_fail(struct super_block *sb, 1624 unsigned long code) 1625 { 1626 #ifdef CONFIG_EXT4_DEBUG 1627 struct ext4_sb_info *sbi = EXT4_SB(sb); 1628 1629 if (unlikely(sbi->s_simulate_fail == code)) { 1630 sbi->s_simulate_fail = 0; 1631 return true; 1632 } 1633 #endif 1634 return false; 1635 } 1636 1637 static inline void ext4_simulate_fail_bh(struct super_block *sb, 1638 struct buffer_head *bh, 1639 unsigned long code) 1640 { 1641 if (!IS_ERR(bh) && ext4_simulate_fail(sb, code)) 1642 clear_buffer_uptodate(bh); 1643 } 1644 1645 /* 1646 * Error number codes for s_{first,last}_error_errno 1647 * 1648 * Linux errno numbers are architecture specific, so we need to translate 1649 * them into something which is architecture independent. We don't define 1650 * codes for all errno's; just the ones which are most likely to be the cause 1651 * of an ext4_error() call. 1652 */ 1653 #define EXT4_ERR_UNKNOWN 1 1654 #define EXT4_ERR_EIO 2 1655 #define EXT4_ERR_ENOMEM 3 1656 #define EXT4_ERR_EFSBADCRC 4 1657 #define EXT4_ERR_EFSCORRUPTED 5 1658 #define EXT4_ERR_ENOSPC 6 1659 #define EXT4_ERR_ENOKEY 7 1660 #define EXT4_ERR_EROFS 8 1661 #define EXT4_ERR_EFBIG 9 1662 #define EXT4_ERR_EEXIST 10 1663 #define EXT4_ERR_ERANGE 11 1664 #define EXT4_ERR_EOVERFLOW 12 1665 #define EXT4_ERR_EBUSY 13 1666 #define EXT4_ERR_ENOTDIR 14 1667 #define EXT4_ERR_ENOTEMPTY 15 1668 #define EXT4_ERR_ESHUTDOWN 16 1669 #define EXT4_ERR_EFAULT 17 1670 1671 /* 1672 * Inode dynamic state flags 1673 */ 1674 enum { 1675 EXT4_STATE_JDATA, /* journaled data exists */ 1676 EXT4_STATE_NEW, /* inode is newly created */ 1677 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1678 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1679 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1680 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1681 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1682 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1683 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1684 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */ 1685 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */ 1686 }; 1687 1688 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1689 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1690 { \ 1691 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1692 } \ 1693 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1694 { \ 1695 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1696 } \ 1697 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1698 { \ 1699 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1700 } 1701 1702 /* Add these declarations here only so that these functions can be 1703 * found by name. Otherwise, they are very hard to locate. */ 1704 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1705 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1706 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1707 EXT4_INODE_BIT_FNS(flag, flags, 0) 1708 1709 /* Add these declarations here only so that these functions can be 1710 * found by name. Otherwise, they are very hard to locate. */ 1711 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1712 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1713 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1714 #if (BITS_PER_LONG < 64) 1715 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1716 1717 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1718 { 1719 (ei)->i_state_flags = 0; 1720 } 1721 #else 1722 EXT4_INODE_BIT_FNS(state, flags, 32) 1723 1724 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1725 { 1726 /* We depend on the fact that callers will set i_flags */ 1727 } 1728 #endif 1729 #else 1730 /* Assume that user mode programs are passing in an ext4fs superblock, not 1731 * a kernel struct super_block. This will allow us to call the feature-test 1732 * macros from user land. */ 1733 #define EXT4_SB(sb) (sb) 1734 #endif 1735 1736 static inline bool ext4_verity_in_progress(struct inode *inode) 1737 { 1738 return IS_ENABLED(CONFIG_FS_VERITY) && 1739 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS); 1740 } 1741 1742 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1743 1744 /* 1745 * Codes for operating systems 1746 */ 1747 #define EXT4_OS_LINUX 0 1748 #define EXT4_OS_HURD 1 1749 #define EXT4_OS_MASIX 2 1750 #define EXT4_OS_FREEBSD 3 1751 #define EXT4_OS_LITES 4 1752 1753 /* 1754 * Revision levels 1755 */ 1756 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1757 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1758 1759 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1760 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1761 1762 #define EXT4_GOOD_OLD_INODE_SIZE 128 1763 1764 #define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN) 1765 #define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX 1766 #define EXT4_TIMESTAMP_MIN S32_MIN 1767 1768 /* 1769 * Feature set definitions 1770 */ 1771 1772 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1773 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1774 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1775 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1776 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1777 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1778 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1779 #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800 1780 1781 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1782 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1783 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1784 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1785 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1786 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1787 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1788 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1789 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1790 /* 1791 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1792 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1793 * all other data structures' checksums. However, the METADATA_CSUM and 1794 * GDT_CSUM bits are mutually exclusive. 1795 */ 1796 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1797 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1798 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 1799 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000 1800 1801 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1802 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1803 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1804 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1805 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1806 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1807 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1808 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1809 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1810 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1811 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1812 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 1813 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1814 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1815 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1816 #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000 1817 1818 extern void ext4_update_dynamic_rev(struct super_block *sb); 1819 1820 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 1821 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1822 { \ 1823 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1824 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 1825 } \ 1826 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1827 { \ 1828 ext4_update_dynamic_rev(sb); \ 1829 EXT4_SB(sb)->s_es->s_feature_compat |= \ 1830 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1831 } \ 1832 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1833 { \ 1834 EXT4_SB(sb)->s_es->s_feature_compat &= \ 1835 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1836 } 1837 1838 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 1839 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1840 { \ 1841 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1842 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 1843 } \ 1844 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1845 { \ 1846 ext4_update_dynamic_rev(sb); \ 1847 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 1848 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1849 } \ 1850 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1851 { \ 1852 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 1853 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1854 } 1855 1856 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 1857 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1858 { \ 1859 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1860 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 1861 } \ 1862 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1863 { \ 1864 ext4_update_dynamic_rev(sb); \ 1865 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 1866 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1867 } \ 1868 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1869 { \ 1870 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 1871 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1872 } 1873 1874 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 1875 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 1876 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 1877 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 1878 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 1879 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 1880 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 1881 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES) 1882 1883 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 1884 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 1885 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 1886 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 1887 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 1888 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 1889 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 1890 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 1891 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 1892 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 1893 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 1894 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 1895 EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY) 1896 1897 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 1898 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 1899 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 1900 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 1901 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 1902 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 1903 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 1904 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 1905 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 1906 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 1907 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 1908 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 1909 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 1910 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 1911 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 1912 EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD) 1913 1914 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1915 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1916 EXT4_FEATURE_INCOMPAT_META_BG) 1917 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1918 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1919 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1920 1921 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1922 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1923 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1924 EXT4_FEATURE_INCOMPAT_META_BG) 1925 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1926 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1927 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1928 1929 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1930 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1931 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1932 EXT4_FEATURE_INCOMPAT_META_BG| \ 1933 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1934 EXT4_FEATURE_INCOMPAT_64BIT| \ 1935 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1936 EXT4_FEATURE_INCOMPAT_EA_INODE| \ 1937 EXT4_FEATURE_INCOMPAT_MMP | \ 1938 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 1939 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 1940 EXT4_FEATURE_INCOMPAT_CASEFOLD | \ 1941 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \ 1942 EXT4_FEATURE_INCOMPAT_LARGEDIR) 1943 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1944 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1945 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1946 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1947 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1948 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1949 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1950 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1951 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1952 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 1953 EXT4_FEATURE_RO_COMPAT_PROJECT |\ 1954 EXT4_FEATURE_RO_COMPAT_VERITY) 1955 1956 #define EXTN_FEATURE_FUNCS(ver) \ 1957 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 1958 { \ 1959 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1960 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 1961 } \ 1962 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 1963 { \ 1964 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1965 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 1966 } \ 1967 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 1968 { \ 1969 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1970 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 1971 } 1972 1973 EXTN_FEATURE_FUNCS(2) 1974 EXTN_FEATURE_FUNCS(3) 1975 EXTN_FEATURE_FUNCS(4) 1976 1977 static inline bool ext4_has_compat_features(struct super_block *sb) 1978 { 1979 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 1980 } 1981 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 1982 { 1983 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 1984 } 1985 static inline bool ext4_has_incompat_features(struct super_block *sb) 1986 { 1987 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 1988 } 1989 1990 /* 1991 * Superblock flags 1992 */ 1993 #define EXT4_FLAGS_RESIZING 0 1994 #define EXT4_FLAGS_SHUTDOWN 1 1995 1996 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi) 1997 { 1998 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 1999 } 2000 2001 2002 /* 2003 * Default values for user and/or group using reserved blocks 2004 */ 2005 #define EXT4_DEF_RESUID 0 2006 #define EXT4_DEF_RESGID 0 2007 2008 /* 2009 * Default project ID 2010 */ 2011 #define EXT4_DEF_PROJID 0 2012 2013 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 2014 2015 /* 2016 * Default mount options 2017 */ 2018 #define EXT4_DEFM_DEBUG 0x0001 2019 #define EXT4_DEFM_BSDGROUPS 0x0002 2020 #define EXT4_DEFM_XATTR_USER 0x0004 2021 #define EXT4_DEFM_ACL 0x0008 2022 #define EXT4_DEFM_UID16 0x0010 2023 #define EXT4_DEFM_JMODE 0x0060 2024 #define EXT4_DEFM_JMODE_DATA 0x0020 2025 #define EXT4_DEFM_JMODE_ORDERED 0x0040 2026 #define EXT4_DEFM_JMODE_WBACK 0x0060 2027 #define EXT4_DEFM_NOBARRIER 0x0100 2028 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 2029 #define EXT4_DEFM_DISCARD 0x0400 2030 #define EXT4_DEFM_NODELALLOC 0x0800 2031 2032 /* 2033 * Default journal batch times 2034 */ 2035 #define EXT4_DEF_MIN_BATCH_TIME 0 2036 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 2037 2038 /* 2039 * Minimum number of groups in a flexgroup before we separate out 2040 * directories into the first block group of a flexgroup 2041 */ 2042 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 2043 2044 /* 2045 * Structure of a directory entry 2046 */ 2047 #define EXT4_NAME_LEN 255 2048 2049 struct ext4_dir_entry { 2050 __le32 inode; /* Inode number */ 2051 __le16 rec_len; /* Directory entry length */ 2052 __le16 name_len; /* Name length */ 2053 char name[EXT4_NAME_LEN]; /* File name */ 2054 }; 2055 2056 /* 2057 * The new version of the directory entry. Since EXT4 structures are 2058 * stored in intel byte order, and the name_len field could never be 2059 * bigger than 255 chars, it's safe to reclaim the extra byte for the 2060 * file_type field. 2061 */ 2062 struct ext4_dir_entry_2 { 2063 __le32 inode; /* Inode number */ 2064 __le16 rec_len; /* Directory entry length */ 2065 __u8 name_len; /* Name length */ 2066 __u8 file_type; /* See file type macros EXT4_FT_* below */ 2067 char name[EXT4_NAME_LEN]; /* File name */ 2068 }; 2069 2070 /* 2071 * This is a bogus directory entry at the end of each leaf block that 2072 * records checksums. 2073 */ 2074 struct ext4_dir_entry_tail { 2075 __le32 det_reserved_zero1; /* Pretend to be unused */ 2076 __le16 det_rec_len; /* 12 */ 2077 __u8 det_reserved_zero2; /* Zero name length */ 2078 __u8 det_reserved_ft; /* 0xDE, fake file type */ 2079 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 2080 }; 2081 2082 #define EXT4_DIRENT_TAIL(block, blocksize) \ 2083 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 2084 ((blocksize) - \ 2085 sizeof(struct ext4_dir_entry_tail)))) 2086 2087 /* 2088 * Ext4 directory file types. Only the low 3 bits are used. The 2089 * other bits are reserved for now. 2090 */ 2091 #define EXT4_FT_UNKNOWN 0 2092 #define EXT4_FT_REG_FILE 1 2093 #define EXT4_FT_DIR 2 2094 #define EXT4_FT_CHRDEV 3 2095 #define EXT4_FT_BLKDEV 4 2096 #define EXT4_FT_FIFO 5 2097 #define EXT4_FT_SOCK 6 2098 #define EXT4_FT_SYMLINK 7 2099 2100 #define EXT4_FT_MAX 8 2101 2102 #define EXT4_FT_DIR_CSUM 0xDE 2103 2104 /* 2105 * EXT4_DIR_PAD defines the directory entries boundaries 2106 * 2107 * NOTE: It must be a multiple of 4 2108 */ 2109 #define EXT4_DIR_PAD 4 2110 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 2111 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 2112 ~EXT4_DIR_ROUND) 2113 #define EXT4_MAX_REC_LEN ((1<<16)-1) 2114 2115 /* 2116 * If we ever get support for fs block sizes > page_size, we'll need 2117 * to remove the #if statements in the next two functions... 2118 */ 2119 static inline unsigned int 2120 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 2121 { 2122 unsigned len = le16_to_cpu(dlen); 2123 2124 #if (PAGE_SIZE >= 65536) 2125 if (len == EXT4_MAX_REC_LEN || len == 0) 2126 return blocksize; 2127 return (len & 65532) | ((len & 3) << 16); 2128 #else 2129 return len; 2130 #endif 2131 } 2132 2133 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 2134 { 2135 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 2136 BUG(); 2137 #if (PAGE_SIZE >= 65536) 2138 if (len < 65536) 2139 return cpu_to_le16(len); 2140 if (len == blocksize) { 2141 if (blocksize == 65536) 2142 return cpu_to_le16(EXT4_MAX_REC_LEN); 2143 else 2144 return cpu_to_le16(0); 2145 } 2146 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 2147 #else 2148 return cpu_to_le16(len); 2149 #endif 2150 } 2151 2152 /* 2153 * Hash Tree Directory indexing 2154 * (c) Daniel Phillips, 2001 2155 */ 2156 2157 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2158 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2159 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \ 2160 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir))) 2161 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2162 2163 /* Legal values for the dx_root hash_version field: */ 2164 2165 #define DX_HASH_LEGACY 0 2166 #define DX_HASH_HALF_MD4 1 2167 #define DX_HASH_TEA 2 2168 #define DX_HASH_LEGACY_UNSIGNED 3 2169 #define DX_HASH_HALF_MD4_UNSIGNED 4 2170 #define DX_HASH_TEA_UNSIGNED 5 2171 2172 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 2173 const void *address, unsigned int length) 2174 { 2175 struct { 2176 struct shash_desc shash; 2177 char ctx[4]; 2178 } desc; 2179 2180 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2181 2182 desc.shash.tfm = sbi->s_chksum_driver; 2183 *(u32 *)desc.ctx = crc; 2184 2185 BUG_ON(crypto_shash_update(&desc.shash, address, length)); 2186 2187 return *(u32 *)desc.ctx; 2188 } 2189 2190 #ifdef __KERNEL__ 2191 2192 /* hash info structure used by the directory hash */ 2193 struct dx_hash_info 2194 { 2195 u32 hash; 2196 u32 minor_hash; 2197 int hash_version; 2198 u32 *seed; 2199 }; 2200 2201 2202 /* 32 and 64 bit signed EOF for dx directories */ 2203 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2204 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2205 2206 2207 /* 2208 * Control parameters used by ext4_htree_next_block 2209 */ 2210 #define HASH_NB_ALWAYS 1 2211 2212 struct ext4_filename { 2213 const struct qstr *usr_fname; 2214 struct fscrypt_str disk_name; 2215 struct dx_hash_info hinfo; 2216 #ifdef CONFIG_FS_ENCRYPTION 2217 struct fscrypt_str crypto_buf; 2218 #endif 2219 #ifdef CONFIG_UNICODE 2220 struct fscrypt_str cf_name; 2221 #endif 2222 }; 2223 2224 #define fname_name(p) ((p)->disk_name.name) 2225 #define fname_len(p) ((p)->disk_name.len) 2226 2227 /* 2228 * Describe an inode's exact location on disk and in memory 2229 */ 2230 struct ext4_iloc 2231 { 2232 struct buffer_head *bh; 2233 unsigned long offset; 2234 ext4_group_t block_group; 2235 }; 2236 2237 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2238 { 2239 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2240 } 2241 2242 static inline bool ext4_is_quota_file(struct inode *inode) 2243 { 2244 return IS_NOQUOTA(inode) && 2245 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL); 2246 } 2247 2248 /* 2249 * This structure is stuffed into the struct file's private_data field 2250 * for directories. It is where we put information so that we can do 2251 * readdir operations in hash tree order. 2252 */ 2253 struct dir_private_info { 2254 struct rb_root root; 2255 struct rb_node *curr_node; 2256 struct fname *extra_fname; 2257 loff_t last_pos; 2258 __u32 curr_hash; 2259 __u32 curr_minor_hash; 2260 __u32 next_hash; 2261 }; 2262 2263 /* calculate the first block number of the group */ 2264 static inline ext4_fsblk_t 2265 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2266 { 2267 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2268 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2269 } 2270 2271 /* 2272 * Special error return code only used by dx_probe() and its callers. 2273 */ 2274 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2275 2276 /* htree levels for ext4 */ 2277 #define EXT4_HTREE_LEVEL_COMPAT 2 2278 #define EXT4_HTREE_LEVEL 3 2279 2280 static inline int ext4_dir_htree_level(struct super_block *sb) 2281 { 2282 return ext4_has_feature_largedir(sb) ? 2283 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT; 2284 } 2285 2286 /* 2287 * Timeout and state flag for lazy initialization inode thread. 2288 */ 2289 #define EXT4_DEF_LI_WAIT_MULT 10 2290 #define EXT4_DEF_LI_MAX_START_DELAY 5 2291 #define EXT4_LAZYINIT_QUIT 0x0001 2292 #define EXT4_LAZYINIT_RUNNING 0x0002 2293 2294 /* 2295 * Lazy inode table initialization info 2296 */ 2297 struct ext4_lazy_init { 2298 unsigned long li_state; 2299 struct list_head li_request_list; 2300 struct mutex li_list_mtx; 2301 }; 2302 2303 struct ext4_li_request { 2304 struct super_block *lr_super; 2305 struct ext4_sb_info *lr_sbi; 2306 ext4_group_t lr_next_group; 2307 struct list_head lr_request; 2308 unsigned long lr_next_sched; 2309 unsigned long lr_timeout; 2310 }; 2311 2312 struct ext4_features { 2313 struct kobject f_kobj; 2314 struct completion f_kobj_unregister; 2315 }; 2316 2317 /* 2318 * This structure will be used for multiple mount protection. It will be 2319 * written into the block number saved in the s_mmp_block field in the 2320 * superblock. Programs that check MMP should assume that if 2321 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2322 * to use the filesystem, regardless of how old the timestamp is. 2323 */ 2324 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2325 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2326 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2327 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2328 2329 struct mmp_struct { 2330 __le32 mmp_magic; /* Magic number for MMP */ 2331 __le32 mmp_seq; /* Sequence no. updated periodically */ 2332 2333 /* 2334 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2335 * purposes and do not affect the correctness of the algorithm 2336 */ 2337 __le64 mmp_time; /* Time last updated */ 2338 char mmp_nodename[64]; /* Node which last updated MMP block */ 2339 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2340 2341 /* 2342 * mmp_check_interval is used to verify if the MMP block has been 2343 * updated on the block device. The value is updated based on the 2344 * maximum time to write the MMP block during an update cycle. 2345 */ 2346 __le16 mmp_check_interval; 2347 2348 __le16 mmp_pad1; 2349 __le32 mmp_pad2[226]; 2350 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2351 }; 2352 2353 /* arguments passed to the mmp thread */ 2354 struct mmpd_data { 2355 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2356 struct super_block *sb; /* super block of the fs */ 2357 }; 2358 2359 /* 2360 * Check interval multiplier 2361 * The MMP block is written every update interval and initially checked every 2362 * update interval x the multiplier (the value is then adapted based on the 2363 * write latency). The reason is that writes can be delayed under load and we 2364 * don't want readers to incorrectly assume that the filesystem is no longer 2365 * in use. 2366 */ 2367 #define EXT4_MMP_CHECK_MULT 2UL 2368 2369 /* 2370 * Minimum interval for MMP checking in seconds. 2371 */ 2372 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2373 2374 /* 2375 * Maximum interval for MMP checking in seconds. 2376 */ 2377 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2378 2379 /* 2380 * Function prototypes 2381 */ 2382 2383 /* 2384 * Ok, these declarations are also in <linux/kernel.h> but none of the 2385 * ext4 source programs needs to include it so they are duplicated here. 2386 */ 2387 # define NORET_TYPE /**/ 2388 # define ATTRIB_NORET __attribute__((noreturn)) 2389 # define NORET_AND noreturn, 2390 2391 /* bitmap.c */ 2392 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2393 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2394 struct ext4_group_desc *gdp, 2395 struct buffer_head *bh, int sz); 2396 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2397 struct ext4_group_desc *gdp, 2398 struct buffer_head *bh, int sz); 2399 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2400 struct ext4_group_desc *gdp, 2401 struct buffer_head *bh); 2402 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2403 struct ext4_group_desc *gdp, 2404 struct buffer_head *bh); 2405 2406 /* balloc.c */ 2407 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2408 ext4_fsblk_t blocknr, 2409 ext4_group_t *blockgrpp, 2410 ext4_grpblk_t *offsetp); 2411 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2412 ext4_fsblk_t block); 2413 2414 extern unsigned int ext4_block_group(struct super_block *sb, 2415 ext4_fsblk_t blocknr); 2416 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2417 ext4_fsblk_t blocknr); 2418 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2419 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2420 ext4_group_t group); 2421 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2422 ext4_fsblk_t goal, 2423 unsigned int flags, 2424 unsigned long *count, 2425 int *errp); 2426 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2427 s64 nclusters, unsigned int flags); 2428 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2429 extern void ext4_check_blocks_bitmap(struct super_block *); 2430 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2431 ext4_group_t block_group, 2432 struct buffer_head ** bh); 2433 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2434 2435 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2436 ext4_group_t block_group); 2437 extern int ext4_wait_block_bitmap(struct super_block *sb, 2438 ext4_group_t block_group, 2439 struct buffer_head *bh); 2440 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2441 ext4_group_t block_group); 2442 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2443 ext4_group_t block_group, 2444 struct ext4_group_desc *gdp); 2445 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2446 2447 #ifdef CONFIG_UNICODE 2448 extern void ext4_fname_setup_ci_filename(struct inode *dir, 2449 const struct qstr *iname, 2450 struct fscrypt_str *fname); 2451 #endif 2452 2453 #ifdef CONFIG_FS_ENCRYPTION 2454 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst, 2455 const struct fscrypt_name *src) 2456 { 2457 memset(dst, 0, sizeof(*dst)); 2458 2459 dst->usr_fname = src->usr_fname; 2460 dst->disk_name = src->disk_name; 2461 dst->hinfo.hash = src->hash; 2462 dst->hinfo.minor_hash = src->minor_hash; 2463 dst->crypto_buf = src->crypto_buf; 2464 } 2465 2466 static inline int ext4_fname_setup_filename(struct inode *dir, 2467 const struct qstr *iname, 2468 int lookup, 2469 struct ext4_filename *fname) 2470 { 2471 struct fscrypt_name name; 2472 int err; 2473 2474 err = fscrypt_setup_filename(dir, iname, lookup, &name); 2475 if (err) 2476 return err; 2477 2478 ext4_fname_from_fscrypt_name(fname, &name); 2479 2480 #ifdef CONFIG_UNICODE 2481 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name); 2482 #endif 2483 return 0; 2484 } 2485 2486 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2487 struct dentry *dentry, 2488 struct ext4_filename *fname) 2489 { 2490 struct fscrypt_name name; 2491 int err; 2492 2493 err = fscrypt_prepare_lookup(dir, dentry, &name); 2494 if (err) 2495 return err; 2496 2497 ext4_fname_from_fscrypt_name(fname, &name); 2498 2499 #ifdef CONFIG_UNICODE 2500 ext4_fname_setup_ci_filename(dir, &dentry->d_name, &fname->cf_name); 2501 #endif 2502 return 0; 2503 } 2504 2505 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2506 { 2507 struct fscrypt_name name; 2508 2509 name.crypto_buf = fname->crypto_buf; 2510 fscrypt_free_filename(&name); 2511 2512 fname->crypto_buf.name = NULL; 2513 fname->usr_fname = NULL; 2514 fname->disk_name.name = NULL; 2515 2516 #ifdef CONFIG_UNICODE 2517 kfree(fname->cf_name.name); 2518 fname->cf_name.name = NULL; 2519 #endif 2520 } 2521 #else /* !CONFIG_FS_ENCRYPTION */ 2522 static inline int ext4_fname_setup_filename(struct inode *dir, 2523 const struct qstr *iname, 2524 int lookup, 2525 struct ext4_filename *fname) 2526 { 2527 fname->usr_fname = iname; 2528 fname->disk_name.name = (unsigned char *) iname->name; 2529 fname->disk_name.len = iname->len; 2530 2531 #ifdef CONFIG_UNICODE 2532 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name); 2533 #endif 2534 2535 return 0; 2536 } 2537 2538 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2539 struct dentry *dentry, 2540 struct ext4_filename *fname) 2541 { 2542 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname); 2543 } 2544 2545 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2546 { 2547 #ifdef CONFIG_UNICODE 2548 kfree(fname->cf_name.name); 2549 fname->cf_name.name = NULL; 2550 #endif 2551 } 2552 #endif /* !CONFIG_FS_ENCRYPTION */ 2553 2554 /* dir.c */ 2555 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2556 struct file *, 2557 struct ext4_dir_entry_2 *, 2558 struct buffer_head *, char *, int, 2559 unsigned int); 2560 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2561 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2562 (de), (bh), (buf), (size), (offset))) 2563 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2564 __u32 minor_hash, 2565 struct ext4_dir_entry_2 *dirent, 2566 struct fscrypt_str *ent_name); 2567 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2568 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2569 struct buffer_head *bh, 2570 void *buf, int buf_size, 2571 struct ext4_filename *fname, 2572 struct ext4_dir_entry_2 **dest_de); 2573 void ext4_insert_dentry(struct inode *inode, 2574 struct ext4_dir_entry_2 *de, 2575 int buf_size, 2576 struct ext4_filename *fname); 2577 static inline void ext4_update_dx_flag(struct inode *inode) 2578 { 2579 if (!ext4_has_feature_dir_index(inode->i_sb)) { 2580 /* ext4_iget() should have caught this... */ 2581 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb)); 2582 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2583 } 2584 } 2585 static const unsigned char ext4_filetype_table[] = { 2586 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2587 }; 2588 2589 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2590 { 2591 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2592 return DT_UNKNOWN; 2593 2594 return ext4_filetype_table[filetype]; 2595 } 2596 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2597 void *buf, int buf_size); 2598 2599 /* fsync.c */ 2600 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2601 2602 /* hash.c */ 2603 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len, 2604 struct dx_hash_info *hinfo); 2605 2606 /* ialloc.c */ 2607 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2608 const struct qstr *qstr, __u32 goal, 2609 uid_t *owner, __u32 i_flags, 2610 int handle_type, unsigned int line_no, 2611 int nblocks); 2612 2613 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \ 2614 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2615 i_flags, 0, 0, 0) 2616 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2617 type, nblocks) \ 2618 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2619 0, (type), __LINE__, (nblocks)) 2620 2621 2622 extern void ext4_free_inode(handle_t *, struct inode *); 2623 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2624 extern unsigned long ext4_count_free_inodes(struct super_block *); 2625 extern unsigned long ext4_count_dirs(struct super_block *); 2626 extern void ext4_check_inodes_bitmap(struct super_block *); 2627 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2628 extern int ext4_init_inode_table(struct super_block *sb, 2629 ext4_group_t group, int barrier); 2630 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2631 2632 /* mballoc.c */ 2633 extern const struct seq_operations ext4_mb_seq_groups_ops; 2634 extern long ext4_mb_stats; 2635 extern long ext4_mb_max_to_scan; 2636 extern int ext4_mb_init(struct super_block *); 2637 extern int ext4_mb_release(struct super_block *); 2638 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2639 struct ext4_allocation_request *, int *); 2640 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2641 extern void ext4_discard_preallocations(struct inode *); 2642 extern int __init ext4_init_mballoc(void); 2643 extern void ext4_exit_mballoc(void); 2644 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2645 struct buffer_head *bh, ext4_fsblk_t block, 2646 unsigned long count, int flags); 2647 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2648 ext4_group_t ngroups); 2649 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2650 ext4_group_t i, struct ext4_group_desc *desc); 2651 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2652 ext4_fsblk_t block, unsigned long count); 2653 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2654 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid); 2655 2656 /* inode.c */ 2657 int ext4_inode_is_fast_symlink(struct inode *inode); 2658 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2659 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2660 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count, 2661 bool wait, struct buffer_head **bhs); 2662 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2663 struct buffer_head *bh_result, int create); 2664 int ext4_get_block(struct inode *inode, sector_t iblock, 2665 struct buffer_head *bh_result, int create); 2666 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2667 struct buffer_head *bh, int create); 2668 int ext4_walk_page_buffers(handle_t *handle, 2669 struct buffer_head *head, 2670 unsigned from, 2671 unsigned to, 2672 int *partial, 2673 int (*fn)(handle_t *handle, 2674 struct buffer_head *bh)); 2675 int do_journal_get_write_access(handle_t *handle, 2676 struct buffer_head *bh); 2677 #define FALL_BACK_TO_NONDELALLOC 1 2678 #define CONVERT_INLINE_DATA 2 2679 2680 typedef enum { 2681 EXT4_IGET_NORMAL = 0, 2682 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */ 2683 EXT4_IGET_HANDLE = 0x0002 /* Inode # is from a handle */ 2684 } ext4_iget_flags; 2685 2686 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, 2687 ext4_iget_flags flags, const char *function, 2688 unsigned int line); 2689 2690 #define ext4_iget(sb, ino, flags) \ 2691 __ext4_iget((sb), (ino), (flags), __func__, __LINE__) 2692 2693 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2694 extern int ext4_setattr(struct dentry *, struct iattr *); 2695 extern int ext4_getattr(const struct path *, struct kstat *, u32, unsigned int); 2696 extern void ext4_evict_inode(struct inode *); 2697 extern void ext4_clear_inode(struct inode *); 2698 extern int ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int); 2699 extern int ext4_sync_inode(handle_t *, struct inode *); 2700 extern void ext4_dirty_inode(struct inode *, int); 2701 extern int ext4_change_inode_journal_flag(struct inode *, int); 2702 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2703 extern int ext4_inode_attach_jinode(struct inode *inode); 2704 extern int ext4_can_truncate(struct inode *inode); 2705 extern int ext4_truncate(struct inode *); 2706 extern int ext4_break_layouts(struct inode *); 2707 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2708 extern void ext4_set_inode_flags(struct inode *); 2709 extern int ext4_alloc_da_blocks(struct inode *inode); 2710 extern void ext4_set_aops(struct inode *inode); 2711 extern int ext4_writepage_trans_blocks(struct inode *); 2712 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2713 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2714 loff_t lstart, loff_t lend); 2715 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf); 2716 extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf); 2717 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2718 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 2719 extern void ext4_da_release_space(struct inode *inode, int to_free); 2720 extern void ext4_da_update_reserve_space(struct inode *inode, 2721 int used, int quota_claim); 2722 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 2723 ext4_fsblk_t pblk, ext4_lblk_t len); 2724 2725 /* indirect.c */ 2726 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2727 struct ext4_map_blocks *map, int flags); 2728 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2729 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2730 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2731 ext4_lblk_t start, ext4_lblk_t end); 2732 2733 /* ioctl.c */ 2734 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2735 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2736 2737 /* migrate.c */ 2738 extern int ext4_ext_migrate(struct inode *); 2739 extern int ext4_ind_migrate(struct inode *inode); 2740 2741 /* namei.c */ 2742 extern int ext4_dirblock_csum_verify(struct inode *inode, 2743 struct buffer_head *bh); 2744 extern int ext4_orphan_add(handle_t *, struct inode *); 2745 extern int ext4_orphan_del(handle_t *, struct inode *); 2746 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2747 __u32 start_minor_hash, __u32 *next_hash); 2748 extern int ext4_search_dir(struct buffer_head *bh, 2749 char *search_buf, 2750 int buf_size, 2751 struct inode *dir, 2752 struct ext4_filename *fname, 2753 unsigned int offset, 2754 struct ext4_dir_entry_2 **res_dir); 2755 extern int ext4_generic_delete_entry(handle_t *handle, 2756 struct inode *dir, 2757 struct ext4_dir_entry_2 *de_del, 2758 struct buffer_head *bh, 2759 void *entry_buf, 2760 int buf_size, 2761 int csum_size); 2762 extern bool ext4_empty_dir(struct inode *inode); 2763 2764 /* resize.c */ 2765 extern void ext4_kvfree_array_rcu(void *to_free); 2766 extern int ext4_group_add(struct super_block *sb, 2767 struct ext4_new_group_data *input); 2768 extern int ext4_group_extend(struct super_block *sb, 2769 struct ext4_super_block *es, 2770 ext4_fsblk_t n_blocks_count); 2771 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2772 2773 /* super.c */ 2774 extern struct buffer_head *ext4_sb_bread(struct super_block *sb, 2775 sector_t block, int op_flags); 2776 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 2777 extern int ext4_calculate_overhead(struct super_block *sb); 2778 extern void ext4_superblock_csum_set(struct super_block *sb); 2779 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2780 ext4_group_t ngroup); 2781 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2782 char nbuf[16]); 2783 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb, 2784 ext4_group_t block_group, 2785 unsigned int flags); 2786 2787 extern __printf(6, 7) 2788 void __ext4_error(struct super_block *, const char *, unsigned int, int, __u64, 2789 const char *, ...); 2790 extern __printf(6, 7) 2791 void __ext4_error_inode(struct inode *, const char *, unsigned int, 2792 ext4_fsblk_t, int, const char *, ...); 2793 extern __printf(5, 6) 2794 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2795 const char *, ...); 2796 extern void __ext4_std_error(struct super_block *, const char *, 2797 unsigned int, int); 2798 extern __printf(5, 6) 2799 void __ext4_abort(struct super_block *, const char *, unsigned int, int, 2800 const char *, ...); 2801 extern __printf(4, 5) 2802 void __ext4_warning(struct super_block *, const char *, unsigned int, 2803 const char *, ...); 2804 extern __printf(4, 5) 2805 void __ext4_warning_inode(const struct inode *inode, const char *function, 2806 unsigned int line, const char *fmt, ...); 2807 extern __printf(3, 4) 2808 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2809 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2810 const char *, unsigned int, const char *); 2811 extern __printf(7, 8) 2812 void __ext4_grp_locked_error(const char *, unsigned int, 2813 struct super_block *, ext4_group_t, 2814 unsigned long, ext4_fsblk_t, 2815 const char *, ...); 2816 2817 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 2818 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 2819 2820 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \ 2821 __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a) 2822 2823 #define ext4_error_inode_block(inode, block, err, fmt, a...) \ 2824 __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \ 2825 (fmt), ## a) 2826 2827 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 2828 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 2829 2830 #ifdef CONFIG_PRINTK 2831 2832 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2833 __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__) 2834 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 2835 __ext4_error_inode((inode), (func), (line), (block), \ 2836 (err), (fmt), ##__VA_ARGS__) 2837 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2838 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2839 #define ext4_error(sb, fmt, ...) \ 2840 __ext4_error((sb), __func__, __LINE__, 0, 0, (fmt), ##__VA_ARGS__) 2841 #define ext4_error_err(sb, err, fmt, ...) \ 2842 __ext4_error((sb), __func__, __LINE__, (err), 0, (fmt), ##__VA_ARGS__) 2843 #define ext4_abort(sb, err, fmt, ...) \ 2844 __ext4_abort((sb), __func__, __LINE__, (err), (fmt), ##__VA_ARGS__) 2845 #define ext4_warning(sb, fmt, ...) \ 2846 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2847 #define ext4_warning_inode(inode, fmt, ...) \ 2848 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 2849 #define ext4_msg(sb, level, fmt, ...) \ 2850 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 2851 #define dump_mmp_msg(sb, mmp, msg) \ 2852 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 2853 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2854 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 2855 fmt, ##__VA_ARGS__) 2856 2857 #else 2858 2859 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2860 do { \ 2861 no_printk(fmt, ##__VA_ARGS__); \ 2862 __ext4_error_inode(inode, "", 0, block, 0, " "); \ 2863 } while (0) 2864 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \ 2865 do { \ 2866 no_printk(fmt, ##__VA_ARGS__); \ 2867 __ext4_error_inode(inode, "", 0, block, err, " "); \ 2868 } while (0) 2869 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2870 do { \ 2871 no_printk(fmt, ##__VA_ARGS__); \ 2872 __ext4_error_file(file, "", 0, block, " "); \ 2873 } while (0) 2874 #define ext4_error(sb, fmt, ...) \ 2875 do { \ 2876 no_printk(fmt, ##__VA_ARGS__); \ 2877 __ext4_error(sb, "", 0, 0, 0, " "); \ 2878 } while (0) 2879 #define ext4_error_err(sb, err, fmt, ...) \ 2880 do { \ 2881 no_printk(fmt, ##__VA_ARGS__); \ 2882 __ext4_error(sb, "", 0, err, 0, " "); \ 2883 } while (0) 2884 #define ext4_abort(sb, err, fmt, ...) \ 2885 do { \ 2886 no_printk(fmt, ##__VA_ARGS__); \ 2887 __ext4_abort(sb, "", 0, err, " "); \ 2888 } while (0) 2889 #define ext4_warning(sb, fmt, ...) \ 2890 do { \ 2891 no_printk(fmt, ##__VA_ARGS__); \ 2892 __ext4_warning(sb, "", 0, " "); \ 2893 } while (0) 2894 #define ext4_warning_inode(inode, fmt, ...) \ 2895 do { \ 2896 no_printk(fmt, ##__VA_ARGS__); \ 2897 __ext4_warning_inode(inode, "", 0, " "); \ 2898 } while (0) 2899 #define ext4_msg(sb, level, fmt, ...) \ 2900 do { \ 2901 no_printk(fmt, ##__VA_ARGS__); \ 2902 __ext4_msg(sb, "", " "); \ 2903 } while (0) 2904 #define dump_mmp_msg(sb, mmp, msg) \ 2905 __dump_mmp_msg(sb, mmp, "", 0, "") 2906 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2907 do { \ 2908 no_printk(fmt, ##__VA_ARGS__); \ 2909 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 2910 } while (0) 2911 2912 #endif 2913 2914 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2915 __u32 compat); 2916 extern int ext4_update_rocompat_feature(handle_t *handle, 2917 struct super_block *sb, __u32 rocompat); 2918 extern int ext4_update_incompat_feature(handle_t *handle, 2919 struct super_block *sb, __u32 incompat); 2920 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2921 struct ext4_group_desc *bg); 2922 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2923 struct ext4_group_desc *bg); 2924 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2925 struct ext4_group_desc *bg); 2926 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2927 struct ext4_group_desc *bg); 2928 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2929 struct ext4_group_desc *bg); 2930 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2931 struct ext4_group_desc *bg); 2932 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2933 struct ext4_group_desc *bg); 2934 extern void ext4_block_bitmap_set(struct super_block *sb, 2935 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2936 extern void ext4_inode_bitmap_set(struct super_block *sb, 2937 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2938 extern void ext4_inode_table_set(struct super_block *sb, 2939 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2940 extern void ext4_free_group_clusters_set(struct super_block *sb, 2941 struct ext4_group_desc *bg, 2942 __u32 count); 2943 extern void ext4_free_inodes_set(struct super_block *sb, 2944 struct ext4_group_desc *bg, __u32 count); 2945 extern void ext4_used_dirs_set(struct super_block *sb, 2946 struct ext4_group_desc *bg, __u32 count); 2947 extern void ext4_itable_unused_set(struct super_block *sb, 2948 struct ext4_group_desc *bg, __u32 count); 2949 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2950 struct ext4_group_desc *gdp); 2951 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2952 struct ext4_group_desc *gdp); 2953 extern int ext4_register_li_request(struct super_block *sb, 2954 ext4_group_t first_not_zeroed); 2955 2956 static inline int ext4_has_metadata_csum(struct super_block *sb) 2957 { 2958 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 2959 !EXT4_SB(sb)->s_chksum_driver); 2960 2961 return ext4_has_feature_metadata_csum(sb) && 2962 (EXT4_SB(sb)->s_chksum_driver != NULL); 2963 } 2964 2965 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2966 { 2967 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb); 2968 } 2969 2970 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2971 { 2972 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2973 le32_to_cpu(es->s_blocks_count_lo); 2974 } 2975 2976 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2977 { 2978 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2979 le32_to_cpu(es->s_r_blocks_count_lo); 2980 } 2981 2982 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2983 { 2984 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2985 le32_to_cpu(es->s_free_blocks_count_lo); 2986 } 2987 2988 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2989 ext4_fsblk_t blk) 2990 { 2991 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2992 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2993 } 2994 2995 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2996 ext4_fsblk_t blk) 2997 { 2998 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2999 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 3000 } 3001 3002 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 3003 ext4_fsblk_t blk) 3004 { 3005 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 3006 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 3007 } 3008 3009 static inline loff_t ext4_isize(struct super_block *sb, 3010 struct ext4_inode *raw_inode) 3011 { 3012 if (ext4_has_feature_largedir(sb) || 3013 S_ISREG(le16_to_cpu(raw_inode->i_mode))) 3014 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 3015 le32_to_cpu(raw_inode->i_size_lo); 3016 3017 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 3018 } 3019 3020 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 3021 { 3022 raw_inode->i_size_lo = cpu_to_le32(i_size); 3023 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 3024 } 3025 3026 static inline 3027 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 3028 ext4_group_t group) 3029 { 3030 struct ext4_group_info **grp_info; 3031 long indexv, indexh; 3032 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 3033 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 3034 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 3035 grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv); 3036 return grp_info[indexh]; 3037 } 3038 3039 /* 3040 * Reading s_groups_count requires using smp_rmb() afterwards. See 3041 * the locking protocol documented in the comments of ext4_group_add() 3042 * in resize.c 3043 */ 3044 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 3045 { 3046 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 3047 3048 smp_rmb(); 3049 return ngroups; 3050 } 3051 3052 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 3053 ext4_group_t block_group) 3054 { 3055 return block_group >> sbi->s_log_groups_per_flex; 3056 } 3057 3058 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 3059 { 3060 return 1 << sbi->s_log_groups_per_flex; 3061 } 3062 3063 #define ext4_std_error(sb, errno) \ 3064 do { \ 3065 if ((errno)) \ 3066 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 3067 } while (0) 3068 3069 #ifdef CONFIG_SMP 3070 /* Each CPU can accumulate percpu_counter_batch clusters in their local 3071 * counters. So we need to make sure we have free clusters more 3072 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 3073 */ 3074 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 3075 #else 3076 #define EXT4_FREECLUSTERS_WATERMARK 0 3077 #endif 3078 3079 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 3080 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 3081 { 3082 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 3083 !inode_is_locked(inode)); 3084 down_write(&EXT4_I(inode)->i_data_sem); 3085 if (newsize > EXT4_I(inode)->i_disksize) 3086 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize); 3087 up_write(&EXT4_I(inode)->i_data_sem); 3088 } 3089 3090 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 3091 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 3092 { 3093 int changed = 0; 3094 3095 if (newsize > inode->i_size) { 3096 i_size_write(inode, newsize); 3097 changed = 1; 3098 } 3099 if (newsize > EXT4_I(inode)->i_disksize) { 3100 ext4_update_i_disksize(inode, newsize); 3101 changed |= 2; 3102 } 3103 return changed; 3104 } 3105 3106 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 3107 loff_t len); 3108 3109 struct ext4_group_info { 3110 unsigned long bb_state; 3111 struct rb_root bb_free_root; 3112 ext4_grpblk_t bb_first_free; /* first free block */ 3113 ext4_grpblk_t bb_free; /* total free blocks */ 3114 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 3115 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 3116 struct list_head bb_prealloc_list; 3117 #ifdef DOUBLE_CHECK 3118 void *bb_bitmap; 3119 #endif 3120 struct rw_semaphore alloc_sem; 3121 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 3122 * regions, index is order. 3123 * bb_counters[3] = 5 means 3124 * 5 free 8-block regions. */ 3125 }; 3126 3127 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 3128 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 3129 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 3130 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 3131 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \ 3132 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT) 3133 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \ 3134 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT) 3135 3136 #define EXT4_MB_GRP_NEED_INIT(grp) \ 3137 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 3138 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 3139 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3140 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 3141 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 3142 3143 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 3144 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3145 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 3146 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3147 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 3148 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 3149 3150 #define EXT4_MAX_CONTENTION 8 3151 #define EXT4_CONTENTION_THRESHOLD 2 3152 3153 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 3154 ext4_group_t group) 3155 { 3156 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 3157 } 3158 3159 /* 3160 * Returns true if the filesystem is busy enough that attempts to 3161 * access the block group locks has run into contention. 3162 */ 3163 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 3164 { 3165 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 3166 } 3167 3168 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 3169 { 3170 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 3171 if (spin_trylock(lock)) 3172 /* 3173 * We're able to grab the lock right away, so drop the 3174 * lock contention counter. 3175 */ 3176 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 3177 else { 3178 /* 3179 * The lock is busy, so bump the contention counter, 3180 * and then wait on the spin lock. 3181 */ 3182 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 3183 EXT4_MAX_CONTENTION); 3184 spin_lock(lock); 3185 } 3186 } 3187 3188 static inline void ext4_unlock_group(struct super_block *sb, 3189 ext4_group_t group) 3190 { 3191 spin_unlock(ext4_group_lock_ptr(sb, group)); 3192 } 3193 3194 /* 3195 * Block validity checking 3196 */ 3197 #define ext4_check_indirect_blockref(inode, bh) \ 3198 ext4_check_blockref(__func__, __LINE__, inode, \ 3199 (__le32 *)(bh)->b_data, \ 3200 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 3201 3202 #define ext4_ind_check_inode(inode) \ 3203 ext4_check_blockref(__func__, __LINE__, inode, \ 3204 EXT4_I(inode)->i_data, \ 3205 EXT4_NDIR_BLOCKS) 3206 3207 /* 3208 * Inodes and files operations 3209 */ 3210 3211 /* dir.c */ 3212 extern const struct file_operations ext4_dir_operations; 3213 3214 #ifdef CONFIG_UNICODE 3215 extern const struct dentry_operations ext4_dentry_ops; 3216 #endif 3217 3218 /* file.c */ 3219 extern const struct inode_operations ext4_file_inode_operations; 3220 extern const struct file_operations ext4_file_operations; 3221 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 3222 3223 /* inline.c */ 3224 extern int ext4_get_max_inline_size(struct inode *inode); 3225 extern int ext4_find_inline_data_nolock(struct inode *inode); 3226 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 3227 unsigned int len); 3228 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 3229 3230 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 3231 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 3232 struct inode *inode, 3233 loff_t pos, unsigned len, 3234 unsigned flags, 3235 struct page **pagep); 3236 extern int ext4_write_inline_data_end(struct inode *inode, 3237 loff_t pos, unsigned len, 3238 unsigned copied, 3239 struct page *page); 3240 extern struct buffer_head * 3241 ext4_journalled_write_inline_data(struct inode *inode, 3242 unsigned len, 3243 struct page *page); 3244 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 3245 struct inode *inode, 3246 loff_t pos, unsigned len, 3247 unsigned flags, 3248 struct page **pagep, 3249 void **fsdata); 3250 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 3251 unsigned len, unsigned copied, 3252 struct page *page); 3253 extern int ext4_try_add_inline_entry(handle_t *handle, 3254 struct ext4_filename *fname, 3255 struct inode *dir, struct inode *inode); 3256 extern int ext4_try_create_inline_dir(handle_t *handle, 3257 struct inode *parent, 3258 struct inode *inode); 3259 extern int ext4_read_inline_dir(struct file *filp, 3260 struct dir_context *ctx, 3261 int *has_inline_data); 3262 extern int ext4_inlinedir_to_tree(struct file *dir_file, 3263 struct inode *dir, ext4_lblk_t block, 3264 struct dx_hash_info *hinfo, 3265 __u32 start_hash, __u32 start_minor_hash, 3266 int *has_inline_data); 3267 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3268 struct ext4_filename *fname, 3269 struct ext4_dir_entry_2 **res_dir, 3270 int *has_inline_data); 3271 extern int ext4_delete_inline_entry(handle_t *handle, 3272 struct inode *dir, 3273 struct ext4_dir_entry_2 *de_del, 3274 struct buffer_head *bh, 3275 int *has_inline_data); 3276 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); 3277 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3278 struct ext4_dir_entry_2 **parent_de, 3279 int *retval); 3280 extern int ext4_inline_data_fiemap(struct inode *inode, 3281 struct fiemap_extent_info *fieinfo, 3282 int *has_inline, __u64 start, __u64 len); 3283 3284 struct iomap; 3285 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap); 3286 3287 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3288 3289 extern int ext4_convert_inline_data(struct inode *inode); 3290 3291 static inline int ext4_has_inline_data(struct inode *inode) 3292 { 3293 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3294 EXT4_I(inode)->i_inline_off; 3295 } 3296 3297 /* namei.c */ 3298 extern const struct inode_operations ext4_dir_inode_operations; 3299 extern const struct inode_operations ext4_special_inode_operations; 3300 extern struct dentry *ext4_get_parent(struct dentry *child); 3301 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3302 struct ext4_dir_entry_2 *de, 3303 int blocksize, int csum_size, 3304 unsigned int parent_ino, int dotdot_real_len); 3305 extern void ext4_initialize_dirent_tail(struct buffer_head *bh, 3306 unsigned int blocksize); 3307 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode, 3308 struct buffer_head *bh); 3309 extern int ext4_ci_compare(const struct inode *parent, 3310 const struct qstr *fname, 3311 const struct qstr *entry, bool quick); 3312 3313 #define S_SHIFT 12 3314 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = { 3315 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3316 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3317 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3318 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3319 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3320 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3321 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3322 }; 3323 3324 static inline void ext4_set_de_type(struct super_block *sb, 3325 struct ext4_dir_entry_2 *de, 3326 umode_t mode) { 3327 if (ext4_has_feature_filetype(sb)) 3328 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3329 } 3330 3331 /* readpages.c */ 3332 extern int ext4_mpage_readpages(struct inode *inode, 3333 struct readahead_control *rac, struct page *page); 3334 extern int __init ext4_init_post_read_processing(void); 3335 extern void ext4_exit_post_read_processing(void); 3336 3337 /* symlink.c */ 3338 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3339 extern const struct inode_operations ext4_symlink_inode_operations; 3340 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3341 3342 /* sysfs.c */ 3343 extern int ext4_register_sysfs(struct super_block *sb); 3344 extern void ext4_unregister_sysfs(struct super_block *sb); 3345 extern int __init ext4_init_sysfs(void); 3346 extern void ext4_exit_sysfs(void); 3347 3348 /* block_validity */ 3349 extern void ext4_release_system_zone(struct super_block *sb); 3350 extern int ext4_setup_system_zone(struct super_block *sb); 3351 extern int __init ext4_init_system_zone(void); 3352 extern void ext4_exit_system_zone(void); 3353 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 3354 ext4_fsblk_t start_blk, 3355 unsigned int count); 3356 extern int ext4_check_blockref(const char *, unsigned int, 3357 struct inode *, __le32 *, unsigned int); 3358 3359 /* extents.c */ 3360 struct ext4_ext_path; 3361 struct ext4_extent; 3362 3363 /* 3364 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3365 * __le32. 3366 */ 3367 #define EXT_MAX_BLOCKS 0xffffffff 3368 3369 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode); 3370 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3371 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3372 struct ext4_map_blocks *map, int flags); 3373 extern int ext4_ext_truncate(handle_t *, struct inode *); 3374 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3375 ext4_lblk_t end); 3376 extern void ext4_ext_init(struct super_block *); 3377 extern void ext4_ext_release(struct super_block *); 3378 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3379 loff_t len); 3380 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3381 loff_t offset, ssize_t len); 3382 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle, 3383 ext4_io_end_t *io_end); 3384 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3385 struct ext4_map_blocks *map, int flags); 3386 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3387 int num, 3388 struct ext4_ext_path *path); 3389 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3390 struct ext4_ext_path **, 3391 struct ext4_extent *, int); 3392 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3393 struct ext4_ext_path **, 3394 int flags); 3395 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 3396 extern int ext4_ext_check_inode(struct inode *inode); 3397 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3398 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3399 __u64 start, __u64 len); 3400 extern int ext4_get_es_cache(struct inode *inode, 3401 struct fiemap_extent_info *fieinfo, 3402 __u64 start, __u64 len); 3403 extern int ext4_ext_precache(struct inode *inode); 3404 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3405 struct inode *inode2, ext4_lblk_t lblk1, 3406 ext4_lblk_t lblk2, ext4_lblk_t count, 3407 int mark_unwritten,int *err); 3408 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu); 3409 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode, 3410 int check_cred, int restart_cred, 3411 int revoke_cred); 3412 3413 3414 /* move_extent.c */ 3415 extern void ext4_double_down_write_data_sem(struct inode *first, 3416 struct inode *second); 3417 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3418 struct inode *donor_inode); 3419 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3420 __u64 start_orig, __u64 start_donor, 3421 __u64 len, __u64 *moved_len); 3422 3423 /* page-io.c */ 3424 extern int __init ext4_init_pageio(void); 3425 extern void ext4_exit_pageio(void); 3426 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3427 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3428 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3429 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3430 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3431 struct writeback_control *wbc); 3432 extern void ext4_end_io_rsv_work(struct work_struct *work); 3433 extern void ext4_io_submit(struct ext4_io_submit *io); 3434 extern int ext4_bio_write_page(struct ext4_io_submit *io, 3435 struct page *page, 3436 int len, 3437 struct writeback_control *wbc, 3438 bool keep_towrite); 3439 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end); 3440 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end); 3441 3442 /* mmp.c */ 3443 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3444 3445 /* verity.c */ 3446 extern const struct fsverity_operations ext4_verityops; 3447 3448 /* 3449 * Add new method to test whether block and inode bitmaps are properly 3450 * initialized. With uninit_bg reading the block from disk is not enough 3451 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3452 */ 3453 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3454 3455 static inline int bitmap_uptodate(struct buffer_head *bh) 3456 { 3457 return (buffer_uptodate(bh) && 3458 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3459 } 3460 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3461 { 3462 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3463 } 3464 3465 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3466 3467 /* For ioend & aio unwritten conversion wait queues */ 3468 #define EXT4_WQ_HASH_SZ 37 3469 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3470 EXT4_WQ_HASH_SZ]) 3471 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3472 3473 extern int ext4_resize_begin(struct super_block *sb); 3474 extern void ext4_resize_end(struct super_block *sb); 3475 3476 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 3477 struct ext4_io_end *io_end) 3478 { 3479 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 3480 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3481 atomic_inc(&EXT4_I(inode)->i_unwritten); 3482 } 3483 } 3484 3485 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3486 { 3487 struct inode *inode = io_end->inode; 3488 3489 if (io_end->flag & EXT4_IO_END_UNWRITTEN) { 3490 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3491 /* Wake up anyone waiting on unwritten extent conversion */ 3492 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) 3493 wake_up_all(ext4_ioend_wq(inode)); 3494 } 3495 } 3496 3497 extern const struct iomap_ops ext4_iomap_ops; 3498 extern const struct iomap_ops ext4_iomap_overwrite_ops; 3499 extern const struct iomap_ops ext4_iomap_report_ops; 3500 3501 static inline int ext4_buffer_uptodate(struct buffer_head *bh) 3502 { 3503 /* 3504 * If the buffer has the write error flag, we have failed 3505 * to write out data in the block. In this case, we don't 3506 * have to read the block because we may read the old data 3507 * successfully. 3508 */ 3509 if (!buffer_uptodate(bh) && buffer_write_io_error(bh)) 3510 set_buffer_uptodate(bh); 3511 return buffer_uptodate(bh); 3512 } 3513 3514 #endif /* __KERNEL__ */ 3515 3516 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3517 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3518 3519 #endif /* _EXT4_H */ 3520