1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * ext4.h 4 * 5 * Copyright (C) 1992, 1993, 1994, 1995 6 * Remy Card (card@masi.ibp.fr) 7 * Laboratoire MASI - Institut Blaise Pascal 8 * Universite Pierre et Marie Curie (Paris VI) 9 * 10 * from 11 * 12 * linux/include/linux/minix_fs.h 13 * 14 * Copyright (C) 1991, 1992 Linus Torvalds 15 */ 16 17 #ifndef _EXT4_H 18 #define _EXT4_H 19 20 #include <linux/types.h> 21 #include <linux/blkdev.h> 22 #include <linux/magic.h> 23 #include <linux/jbd2.h> 24 #include <linux/quota.h> 25 #include <linux/rwsem.h> 26 #include <linux/rbtree.h> 27 #include <linux/seqlock.h> 28 #include <linux/mutex.h> 29 #include <linux/timer.h> 30 #include <linux/version.h> 31 #include <linux/wait.h> 32 #include <linux/sched/signal.h> 33 #include <linux/blockgroup_lock.h> 34 #include <linux/percpu_counter.h> 35 #include <linux/ratelimit.h> 36 #include <crypto/hash.h> 37 #include <linux/falloc.h> 38 #include <linux/percpu-rwsem.h> 39 #ifdef __KERNEL__ 40 #include <linux/compat.h> 41 #endif 42 43 #include <linux/fscrypt.h> 44 45 #include <linux/compiler.h> 46 47 /* 48 * The fourth extended filesystem constants/structures 49 */ 50 51 /* 52 * with AGGRESSIVE_CHECK allocator runs consistency checks over 53 * structures. these checks slow things down a lot 54 */ 55 #define AGGRESSIVE_CHECK__ 56 57 /* 58 * with DOUBLE_CHECK defined mballoc creates persistent in-core 59 * bitmaps, maintains and uses them to check for double allocations 60 */ 61 #define DOUBLE_CHECK__ 62 63 /* 64 * Define EXT4FS_DEBUG to produce debug messages 65 */ 66 #undef EXT4FS_DEBUG 67 68 /* 69 * Debug code 70 */ 71 #ifdef EXT4FS_DEBUG 72 #define ext4_debug(f, a...) \ 73 do { \ 74 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 75 __FILE__, __LINE__, __func__); \ 76 printk(KERN_DEBUG f, ## a); \ 77 } while (0) 78 #else 79 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 80 #endif 81 82 /* 83 * Turn on EXT_DEBUG to get lots of info about extents operations. 84 */ 85 #define EXT_DEBUG__ 86 #ifdef EXT_DEBUG 87 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__) 88 #else 89 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 90 #endif 91 92 /* data type for block offset of block group */ 93 typedef int ext4_grpblk_t; 94 95 /* data type for filesystem-wide blocks number */ 96 typedef unsigned long long ext4_fsblk_t; 97 98 /* data type for file logical block number */ 99 typedef __u32 ext4_lblk_t; 100 101 /* data type for block group number */ 102 typedef unsigned int ext4_group_t; 103 104 enum SHIFT_DIRECTION { 105 SHIFT_LEFT = 0, 106 SHIFT_RIGHT, 107 }; 108 109 /* 110 * Flags used in mballoc's allocation_context flags field. 111 * 112 * Also used to show what's going on for debugging purposes when the 113 * flag field is exported via the traceport interface 114 */ 115 116 /* prefer goal again. length */ 117 #define EXT4_MB_HINT_MERGE 0x0001 118 /* blocks already reserved */ 119 #define EXT4_MB_HINT_RESERVED 0x0002 120 /* metadata is being allocated */ 121 #define EXT4_MB_HINT_METADATA 0x0004 122 /* first blocks in the file */ 123 #define EXT4_MB_HINT_FIRST 0x0008 124 /* search for the best chunk */ 125 #define EXT4_MB_HINT_BEST 0x0010 126 /* data is being allocated */ 127 #define EXT4_MB_HINT_DATA 0x0020 128 /* don't preallocate (for tails) */ 129 #define EXT4_MB_HINT_NOPREALLOC 0x0040 130 /* allocate for locality group */ 131 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 132 /* allocate goal blocks or none */ 133 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 134 /* goal is meaningful */ 135 #define EXT4_MB_HINT_TRY_GOAL 0x0200 136 /* blocks already pre-reserved by delayed allocation */ 137 #define EXT4_MB_DELALLOC_RESERVED 0x0400 138 /* We are doing stream allocation */ 139 #define EXT4_MB_STREAM_ALLOC 0x0800 140 /* Use reserved root blocks if needed */ 141 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 142 /* Use blocks from reserved pool */ 143 #define EXT4_MB_USE_RESERVED 0x2000 144 145 struct ext4_allocation_request { 146 /* target inode for block we're allocating */ 147 struct inode *inode; 148 /* how many blocks we want to allocate */ 149 unsigned int len; 150 /* logical block in target inode */ 151 ext4_lblk_t logical; 152 /* the closest logical allocated block to the left */ 153 ext4_lblk_t lleft; 154 /* the closest logical allocated block to the right */ 155 ext4_lblk_t lright; 156 /* phys. target (a hint) */ 157 ext4_fsblk_t goal; 158 /* phys. block for the closest logical allocated block to the left */ 159 ext4_fsblk_t pleft; 160 /* phys. block for the closest logical allocated block to the right */ 161 ext4_fsblk_t pright; 162 /* flags. see above EXT4_MB_HINT_* */ 163 unsigned int flags; 164 }; 165 166 /* 167 * Logical to physical block mapping, used by ext4_map_blocks() 168 * 169 * This structure is used to pass requests into ext4_map_blocks() as 170 * well as to store the information returned by ext4_map_blocks(). It 171 * takes less room on the stack than a struct buffer_head. 172 */ 173 #define EXT4_MAP_NEW (1 << BH_New) 174 #define EXT4_MAP_MAPPED (1 << BH_Mapped) 175 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 176 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 177 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 178 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 179 180 struct ext4_map_blocks { 181 ext4_fsblk_t m_pblk; 182 ext4_lblk_t m_lblk; 183 unsigned int m_len; 184 unsigned int m_flags; 185 }; 186 187 /* 188 * Flags for ext4_io_end->flags 189 */ 190 #define EXT4_IO_END_UNWRITTEN 0x0001 191 192 /* 193 * For converting unwritten extents on a work queue. 'handle' is used for 194 * buffered writeback. 195 */ 196 typedef struct ext4_io_end { 197 struct list_head list; /* per-file finished IO list */ 198 handle_t *handle; /* handle reserved for extent 199 * conversion */ 200 struct inode *inode; /* file being written to */ 201 struct bio *bio; /* Linked list of completed 202 * bios covering the extent */ 203 unsigned int flag; /* unwritten or not */ 204 atomic_t count; /* reference counter */ 205 loff_t offset; /* offset in the file */ 206 ssize_t size; /* size of the extent */ 207 } ext4_io_end_t; 208 209 struct ext4_io_submit { 210 struct writeback_control *io_wbc; 211 struct bio *io_bio; 212 ext4_io_end_t *io_end; 213 sector_t io_next_block; 214 }; 215 216 /* 217 * Special inodes numbers 218 */ 219 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 220 #define EXT4_ROOT_INO 2 /* Root inode */ 221 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 222 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 223 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 224 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 225 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 226 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 227 228 /* First non-reserved inode for old ext4 filesystems */ 229 #define EXT4_GOOD_OLD_FIRST_INO 11 230 231 /* 232 * Maximal count of links to a file 233 */ 234 #define EXT4_LINK_MAX 65000 235 236 /* 237 * Macro-instructions used to manage several block sizes 238 */ 239 #define EXT4_MIN_BLOCK_SIZE 1024 240 #define EXT4_MAX_BLOCK_SIZE 65536 241 #define EXT4_MIN_BLOCK_LOG_SIZE 10 242 #define EXT4_MAX_BLOCK_LOG_SIZE 16 243 #define EXT4_MAX_CLUSTER_LOG_SIZE 30 244 #ifdef __KERNEL__ 245 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 246 #else 247 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 248 #endif 249 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 250 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 251 EXT4_SB(s)->s_cluster_bits) 252 #ifdef __KERNEL__ 253 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 254 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 255 #else 256 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 257 #endif 258 #ifdef __KERNEL__ 259 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 260 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 261 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 262 #else 263 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 264 EXT4_GOOD_OLD_INODE_SIZE : \ 265 (s)->s_inode_size) 266 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 267 EXT4_GOOD_OLD_FIRST_INO : \ 268 (s)->s_first_ino) 269 #endif 270 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 271 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \ 272 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \ 273 blkbits)) 274 275 /* Translate a block number to a cluster number */ 276 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 277 /* Translate a cluster number to a block number */ 278 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 279 /* Translate # of blks to # of clusters */ 280 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 281 (sbi)->s_cluster_bits) 282 /* Mask out the low bits to get the starting block of the cluster */ 283 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 284 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 285 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 286 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 287 /* Get the cluster offset */ 288 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 289 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 290 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 291 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 292 293 /* 294 * Structure of a blocks group descriptor 295 */ 296 struct ext4_group_desc 297 { 298 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 299 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 300 __le32 bg_inode_table_lo; /* Inodes table block */ 301 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 302 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 303 __le16 bg_used_dirs_count_lo; /* Directories count */ 304 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 305 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 306 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 307 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 308 __le16 bg_itable_unused_lo; /* Unused inodes count */ 309 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 310 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 311 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 312 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 313 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 314 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 315 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 316 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 317 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 318 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 319 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 320 __u32 bg_reserved; 321 }; 322 323 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 324 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 325 sizeof(__le16)) 326 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 327 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 328 sizeof(__le16)) 329 330 /* 331 * Structure of a flex block group info 332 */ 333 334 struct flex_groups { 335 atomic64_t free_clusters; 336 atomic_t free_inodes; 337 atomic_t used_dirs; 338 }; 339 340 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 341 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 342 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 343 344 /* 345 * Macro-instructions used to manage group descriptors 346 */ 347 #define EXT4_MIN_DESC_SIZE 32 348 #define EXT4_MIN_DESC_SIZE_64BIT 64 349 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 350 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 351 #ifdef __KERNEL__ 352 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 353 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 354 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 355 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 356 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 357 #else 358 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 359 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 360 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 361 #endif 362 363 /* 364 * Constants relative to the data blocks 365 */ 366 #define EXT4_NDIR_BLOCKS 12 367 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 368 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 369 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 370 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 371 372 /* 373 * Inode flags 374 */ 375 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 376 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 377 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 378 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 379 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 380 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 381 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 382 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 383 /* Reserved for compression usage... */ 384 #define EXT4_DIRTY_FL 0x00000100 385 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 386 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 387 /* nb: was previously EXT2_ECOMPR_FL */ 388 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 389 /* End compression flags --- maybe not all used */ 390 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 391 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 392 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 393 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 394 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 395 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 396 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 397 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 398 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 399 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 400 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 401 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 402 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 403 404 #define EXT4_FL_USER_VISIBLE 0x304BDFFF /* User visible flags */ 405 #define EXT4_FL_USER_MODIFIABLE 0x204BC0FF /* User modifiable flags */ 406 407 /* Flags we can manipulate with through EXT4_IOC_FSSETXATTR */ 408 #define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \ 409 EXT4_IMMUTABLE_FL | \ 410 EXT4_APPEND_FL | \ 411 EXT4_NODUMP_FL | \ 412 EXT4_NOATIME_FL | \ 413 EXT4_PROJINHERIT_FL) 414 415 /* Flags that should be inherited by new inodes from their parent. */ 416 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 417 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 418 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 419 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 420 EXT4_PROJINHERIT_FL) 421 422 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 423 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 424 425 /* Flags that are appropriate for non-directories/regular files. */ 426 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 427 428 /* The only flags that should be swapped */ 429 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL) 430 431 /* Mask out flags that are inappropriate for the given type of inode. */ 432 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 433 { 434 if (S_ISDIR(mode)) 435 return flags; 436 else if (S_ISREG(mode)) 437 return flags & EXT4_REG_FLMASK; 438 else 439 return flags & EXT4_OTHER_FLMASK; 440 } 441 442 /* 443 * Inode flags used for atomic set/get 444 */ 445 enum { 446 EXT4_INODE_SECRM = 0, /* Secure deletion */ 447 EXT4_INODE_UNRM = 1, /* Undelete */ 448 EXT4_INODE_COMPR = 2, /* Compress file */ 449 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 450 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 451 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 452 EXT4_INODE_NODUMP = 6, /* do not dump file */ 453 EXT4_INODE_NOATIME = 7, /* do not update atime */ 454 /* Reserved for compression usage... */ 455 EXT4_INODE_DIRTY = 8, 456 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 457 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 458 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 459 /* End compression flags --- maybe not all used */ 460 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 461 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 462 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 463 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 464 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 465 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 466 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 467 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 468 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 469 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 470 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 471 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 472 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 473 }; 474 475 /* 476 * Since it's pretty easy to mix up bit numbers and hex values, we use a 477 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 478 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 479 * any extra space in the compiled kernel image, otherwise, the build will fail. 480 * It's important that these values are the same, since we are using 481 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 482 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 483 * values found in ext2, ext3 and ext4 filesystems, and of course the values 484 * defined in e2fsprogs. 485 * 486 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 487 */ 488 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 489 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 490 491 static inline void ext4_check_flag_values(void) 492 { 493 CHECK_FLAG_VALUE(SECRM); 494 CHECK_FLAG_VALUE(UNRM); 495 CHECK_FLAG_VALUE(COMPR); 496 CHECK_FLAG_VALUE(SYNC); 497 CHECK_FLAG_VALUE(IMMUTABLE); 498 CHECK_FLAG_VALUE(APPEND); 499 CHECK_FLAG_VALUE(NODUMP); 500 CHECK_FLAG_VALUE(NOATIME); 501 CHECK_FLAG_VALUE(DIRTY); 502 CHECK_FLAG_VALUE(COMPRBLK); 503 CHECK_FLAG_VALUE(NOCOMPR); 504 CHECK_FLAG_VALUE(ENCRYPT); 505 CHECK_FLAG_VALUE(INDEX); 506 CHECK_FLAG_VALUE(IMAGIC); 507 CHECK_FLAG_VALUE(JOURNAL_DATA); 508 CHECK_FLAG_VALUE(NOTAIL); 509 CHECK_FLAG_VALUE(DIRSYNC); 510 CHECK_FLAG_VALUE(TOPDIR); 511 CHECK_FLAG_VALUE(HUGE_FILE); 512 CHECK_FLAG_VALUE(EXTENTS); 513 CHECK_FLAG_VALUE(EA_INODE); 514 CHECK_FLAG_VALUE(EOFBLOCKS); 515 CHECK_FLAG_VALUE(INLINE_DATA); 516 CHECK_FLAG_VALUE(PROJINHERIT); 517 CHECK_FLAG_VALUE(RESERVED); 518 } 519 520 /* Used to pass group descriptor data when online resize is done */ 521 struct ext4_new_group_input { 522 __u32 group; /* Group number for this data */ 523 __u64 block_bitmap; /* Absolute block number of block bitmap */ 524 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 525 __u64 inode_table; /* Absolute block number of inode table start */ 526 __u32 blocks_count; /* Total number of blocks in this group */ 527 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 528 __u16 unused; 529 }; 530 531 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 532 struct compat_ext4_new_group_input { 533 u32 group; 534 compat_u64 block_bitmap; 535 compat_u64 inode_bitmap; 536 compat_u64 inode_table; 537 u32 blocks_count; 538 u16 reserved_blocks; 539 u16 unused; 540 }; 541 #endif 542 543 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 544 struct ext4_new_group_data { 545 __u32 group; 546 __u64 block_bitmap; 547 __u64 inode_bitmap; 548 __u64 inode_table; 549 __u32 blocks_count; 550 __u16 reserved_blocks; 551 __u16 mdata_blocks; 552 __u32 free_clusters_count; 553 }; 554 555 /* Indexes used to index group tables in ext4_new_group_data */ 556 enum { 557 BLOCK_BITMAP = 0, /* block bitmap */ 558 INODE_BITMAP, /* inode bitmap */ 559 INODE_TABLE, /* inode tables */ 560 GROUP_TABLE_COUNT, 561 }; 562 563 /* 564 * Flags used by ext4_map_blocks() 565 */ 566 /* Allocate any needed blocks and/or convert an unwritten 567 extent to be an initialized ext4 */ 568 #define EXT4_GET_BLOCKS_CREATE 0x0001 569 /* Request the creation of an unwritten extent */ 570 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 571 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 572 EXT4_GET_BLOCKS_CREATE) 573 /* Caller is from the delayed allocation writeout path 574 * finally doing the actual allocation of delayed blocks */ 575 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 576 /* caller is from the direct IO path, request to creation of an 577 unwritten extents if not allocated, split the unwritten 578 extent if blocks has been preallocated already*/ 579 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 580 #define EXT4_GET_BLOCKS_CONVERT 0x0010 581 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 582 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 583 /* Convert extent to initialized after IO complete */ 584 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 585 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 586 /* Eventual metadata allocation (due to growing extent tree) 587 * should not fail, so try to use reserved blocks for that.*/ 588 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 589 /* Don't normalize allocation size (used for fallocate) */ 590 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 591 /* Request will not result in inode size update (user for fallocate) */ 592 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 593 /* Convert written extents to unwritten */ 594 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 595 /* Write zeros to newly created written extents */ 596 #define EXT4_GET_BLOCKS_ZERO 0x0200 597 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 598 EXT4_GET_BLOCKS_ZERO) 599 /* Caller will submit data before dropping transaction handle. This 600 * allows jbd2 to avoid submitting data before commit. */ 601 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 602 603 /* 604 * The bit position of these flags must not overlap with any of the 605 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 606 * read_extent_tree_block(), ext4_split_extent_at(), 607 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 608 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 609 * caching the extents when reading from the extent tree while a 610 * truncate or punch hole operation is in progress. 611 */ 612 #define EXT4_EX_NOCACHE 0x40000000 613 #define EXT4_EX_FORCE_CACHE 0x20000000 614 615 /* 616 * Flags used by ext4_free_blocks 617 */ 618 #define EXT4_FREE_BLOCKS_METADATA 0x0001 619 #define EXT4_FREE_BLOCKS_FORGET 0x0002 620 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 621 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 622 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 623 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 624 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040 625 626 /* 627 * ioctl commands 628 */ 629 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 630 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 631 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 632 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 633 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 634 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 635 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 636 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 637 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 638 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 639 #define EXT4_IOC_MIGRATE _IO('f', 9) 640 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 641 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 642 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 643 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 644 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 645 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 646 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 647 #define EXT4_IOC_SET_ENCRYPTION_POLICY FS_IOC_SET_ENCRYPTION_POLICY 648 #define EXT4_IOC_GET_ENCRYPTION_PWSALT FS_IOC_GET_ENCRYPTION_PWSALT 649 #define EXT4_IOC_GET_ENCRYPTION_POLICY FS_IOC_GET_ENCRYPTION_POLICY 650 651 #define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR 652 #define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR 653 654 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32) 655 656 /* 657 * Flags for going down operation 658 */ 659 #define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */ 660 #define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */ 661 #define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */ 662 663 664 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 665 /* 666 * ioctl commands in 32 bit emulation 667 */ 668 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 669 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 670 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 671 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 672 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 673 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 674 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 675 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 676 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 677 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 678 #endif 679 680 /* Max physical block we can address w/o extents */ 681 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 682 683 /* Max logical block we can support */ 684 #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFF 685 686 /* 687 * Structure of an inode on the disk 688 */ 689 struct ext4_inode { 690 __le16 i_mode; /* File mode */ 691 __le16 i_uid; /* Low 16 bits of Owner Uid */ 692 __le32 i_size_lo; /* Size in bytes */ 693 __le32 i_atime; /* Access time */ 694 __le32 i_ctime; /* Inode Change time */ 695 __le32 i_mtime; /* Modification time */ 696 __le32 i_dtime; /* Deletion Time */ 697 __le16 i_gid; /* Low 16 bits of Group Id */ 698 __le16 i_links_count; /* Links count */ 699 __le32 i_blocks_lo; /* Blocks count */ 700 __le32 i_flags; /* File flags */ 701 union { 702 struct { 703 __le32 l_i_version; 704 } linux1; 705 struct { 706 __u32 h_i_translator; 707 } hurd1; 708 struct { 709 __u32 m_i_reserved1; 710 } masix1; 711 } osd1; /* OS dependent 1 */ 712 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 713 __le32 i_generation; /* File version (for NFS) */ 714 __le32 i_file_acl_lo; /* File ACL */ 715 __le32 i_size_high; 716 __le32 i_obso_faddr; /* Obsoleted fragment address */ 717 union { 718 struct { 719 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 720 __le16 l_i_file_acl_high; 721 __le16 l_i_uid_high; /* these 2 fields */ 722 __le16 l_i_gid_high; /* were reserved2[0] */ 723 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 724 __le16 l_i_reserved; 725 } linux2; 726 struct { 727 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 728 __u16 h_i_mode_high; 729 __u16 h_i_uid_high; 730 __u16 h_i_gid_high; 731 __u32 h_i_author; 732 } hurd2; 733 struct { 734 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 735 __le16 m_i_file_acl_high; 736 __u32 m_i_reserved2[2]; 737 } masix2; 738 } osd2; /* OS dependent 2 */ 739 __le16 i_extra_isize; 740 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 741 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 742 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 743 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 744 __le32 i_crtime; /* File Creation time */ 745 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 746 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 747 __le32 i_projid; /* Project ID */ 748 }; 749 750 struct move_extent { 751 __u32 reserved; /* should be zero */ 752 __u32 donor_fd; /* donor file descriptor */ 753 __u64 orig_start; /* logical start offset in block for orig */ 754 __u64 donor_start; /* logical start offset in block for donor */ 755 __u64 len; /* block length to be moved */ 756 __u64 moved_len; /* moved block length */ 757 }; 758 759 #define EXT4_EPOCH_BITS 2 760 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 761 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 762 763 /* 764 * Extended fields will fit into an inode if the filesystem was formatted 765 * with large inodes (-I 256 or larger) and there are not currently any EAs 766 * consuming all of the available space. For new inodes we always reserve 767 * enough space for the kernel's known extended fields, but for inodes 768 * created with an old kernel this might not have been the case. None of 769 * the extended inode fields is critical for correct filesystem operation. 770 * This macro checks if a certain field fits in the inode. Note that 771 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 772 */ 773 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 774 ((offsetof(typeof(*ext4_inode), field) + \ 775 sizeof((ext4_inode)->field)) \ 776 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 777 (einode)->i_extra_isize)) \ 778 779 /* 780 * We use an encoding that preserves the times for extra epoch "00": 781 * 782 * extra msb of adjust for signed 783 * epoch 32-bit 32-bit tv_sec to 784 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 785 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 786 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 787 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 788 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 789 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 790 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 791 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 792 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 793 * 794 * Note that previous versions of the kernel on 64-bit systems would 795 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 796 * 1970. e2fsck will correct this, assuming that it is run on the 797 * affected filesystem before 2242. 798 */ 799 800 static inline __le32 ext4_encode_extra_time(struct timespec64 *time) 801 { 802 u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK; 803 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); 804 } 805 806 static inline void ext4_decode_extra_time(struct timespec64 *time, 807 __le32 extra) 808 { 809 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) { 810 811 #if 1 812 /* Handle legacy encoding of pre-1970 dates with epoch 813 * bits 1,1. (This backwards compatibility may be removed 814 * at the discretion of the ext4 developers.) 815 */ 816 u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK; 817 if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0) 818 extra_bits = 0; 819 time->tv_sec += extra_bits << 32; 820 #else 821 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 822 #endif 823 } 824 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 825 } 826 827 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 828 do { \ 829 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 830 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\ 831 (raw_inode)->xtime ## _extra = \ 832 ext4_encode_extra_time(&(inode)->xtime); \ 833 } \ 834 } while (0) 835 836 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 837 do { \ 838 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 839 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 840 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 841 (raw_inode)->xtime ## _extra = \ 842 ext4_encode_extra_time(&(einode)->xtime); \ 843 } while (0) 844 845 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 846 do { \ 847 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 848 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \ 849 ext4_decode_extra_time(&(inode)->xtime, \ 850 raw_inode->xtime ## _extra); \ 851 } \ 852 else \ 853 (inode)->xtime.tv_nsec = 0; \ 854 } while (0) 855 856 857 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 858 do { \ 859 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 860 (einode)->xtime.tv_sec = \ 861 (signed)le32_to_cpu((raw_inode)->xtime); \ 862 else \ 863 (einode)->xtime.tv_sec = 0; \ 864 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 865 ext4_decode_extra_time(&(einode)->xtime, \ 866 raw_inode->xtime ## _extra); \ 867 else \ 868 (einode)->xtime.tv_nsec = 0; \ 869 } while (0) 870 871 #define i_disk_version osd1.linux1.l_i_version 872 873 #if defined(__KERNEL__) || defined(__linux__) 874 #define i_reserved1 osd1.linux1.l_i_reserved1 875 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 876 #define i_blocks_high osd2.linux2.l_i_blocks_high 877 #define i_uid_low i_uid 878 #define i_gid_low i_gid 879 #define i_uid_high osd2.linux2.l_i_uid_high 880 #define i_gid_high osd2.linux2.l_i_gid_high 881 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 882 883 #elif defined(__GNU__) 884 885 #define i_translator osd1.hurd1.h_i_translator 886 #define i_uid_high osd2.hurd2.h_i_uid_high 887 #define i_gid_high osd2.hurd2.h_i_gid_high 888 #define i_author osd2.hurd2.h_i_author 889 890 #elif defined(__masix__) 891 892 #define i_reserved1 osd1.masix1.m_i_reserved1 893 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 894 #define i_reserved2 osd2.masix2.m_i_reserved2 895 896 #endif /* defined(__KERNEL__) || defined(__linux__) */ 897 898 #include "extents_status.h" 899 900 /* 901 * Lock subclasses for i_data_sem in the ext4_inode_info structure. 902 * 903 * These are needed to avoid lockdep false positives when we need to 904 * allocate blocks to the quota inode during ext4_map_blocks(), while 905 * holding i_data_sem for a normal (non-quota) inode. Since we don't 906 * do quota tracking for the quota inode, this avoids deadlock (as 907 * well as infinite recursion, since it isn't turtles all the way 908 * down...) 909 * 910 * I_DATA_SEM_NORMAL - Used for most inodes 911 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode 912 * where the second inode has larger inode number 913 * than the first 914 * I_DATA_SEM_QUOTA - Used for quota inodes only 915 */ 916 enum { 917 I_DATA_SEM_NORMAL = 0, 918 I_DATA_SEM_OTHER, 919 I_DATA_SEM_QUOTA, 920 }; 921 922 923 /* 924 * fourth extended file system inode data in memory 925 */ 926 struct ext4_inode_info { 927 __le32 i_data[15]; /* unconverted */ 928 __u32 i_dtime; 929 ext4_fsblk_t i_file_acl; 930 931 /* 932 * i_block_group is the number of the block group which contains 933 * this file's inode. Constant across the lifetime of the inode, 934 * it is used for making block allocation decisions - we try to 935 * place a file's data blocks near its inode block, and new inodes 936 * near to their parent directory's inode. 937 */ 938 ext4_group_t i_block_group; 939 ext4_lblk_t i_dir_start_lookup; 940 #if (BITS_PER_LONG < 64) 941 unsigned long i_state_flags; /* Dynamic state flags */ 942 #endif 943 unsigned long i_flags; 944 945 /* 946 * Extended attributes can be read independently of the main file 947 * data. Taking i_mutex even when reading would cause contention 948 * between readers of EAs and writers of regular file data, so 949 * instead we synchronize on xattr_sem when reading or changing 950 * EAs. 951 */ 952 struct rw_semaphore xattr_sem; 953 954 struct list_head i_orphan; /* unlinked but open inodes */ 955 956 /* 957 * i_disksize keeps track of what the inode size is ON DISK, not 958 * in memory. During truncate, i_size is set to the new size by 959 * the VFS prior to calling ext4_truncate(), but the filesystem won't 960 * set i_disksize to 0 until the truncate is actually under way. 961 * 962 * The intent is that i_disksize always represents the blocks which 963 * are used by this file. This allows recovery to restart truncate 964 * on orphans if we crash during truncate. We actually write i_disksize 965 * into the on-disk inode when writing inodes out, instead of i_size. 966 * 967 * The only time when i_disksize and i_size may be different is when 968 * a truncate is in progress. The only things which change i_disksize 969 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 970 */ 971 loff_t i_disksize; 972 973 /* 974 * i_data_sem is for serialising ext4_truncate() against 975 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 976 * data tree are chopped off during truncate. We can't do that in 977 * ext4 because whenever we perform intermediate commits during 978 * truncate, the inode and all the metadata blocks *must* be in a 979 * consistent state which allows truncation of the orphans to restart 980 * during recovery. Hence we must fix the get_block-vs-truncate race 981 * by other means, so we have i_data_sem. 982 */ 983 struct rw_semaphore i_data_sem; 984 /* 985 * i_mmap_sem is for serializing page faults with truncate / punch hole 986 * operations. We have to make sure that new page cannot be faulted in 987 * a section of the inode that is being punched. We cannot easily use 988 * i_data_sem for this since we need protection for the whole punch 989 * operation and i_data_sem ranks below transaction start so we have 990 * to occasionally drop it. 991 */ 992 struct rw_semaphore i_mmap_sem; 993 struct inode vfs_inode; 994 struct jbd2_inode *jinode; 995 996 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 997 998 /* 999 * File creation time. Its function is same as that of 1000 * struct timespec64 i_{a,c,m}time in the generic inode. 1001 */ 1002 struct timespec64 i_crtime; 1003 1004 /* mballoc */ 1005 struct list_head i_prealloc_list; 1006 spinlock_t i_prealloc_lock; 1007 1008 /* extents status tree */ 1009 struct ext4_es_tree i_es_tree; 1010 rwlock_t i_es_lock; 1011 struct list_head i_es_list; 1012 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1013 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1014 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1015 extents to shrink. Protected by 1016 i_es_lock */ 1017 1018 /* ialloc */ 1019 ext4_group_t i_last_alloc_group; 1020 1021 /* allocation reservation info for delalloc */ 1022 /* In case of bigalloc, this refer to clusters rather than blocks */ 1023 unsigned int i_reserved_data_blocks; 1024 ext4_lblk_t i_da_metadata_calc_last_lblock; 1025 int i_da_metadata_calc_len; 1026 1027 /* pending cluster reservations for bigalloc file systems */ 1028 struct ext4_pending_tree i_pending_tree; 1029 1030 /* on-disk additional length */ 1031 __u16 i_extra_isize; 1032 1033 /* Indicate the inline data space. */ 1034 u16 i_inline_off; 1035 u16 i_inline_size; 1036 1037 #ifdef CONFIG_QUOTA 1038 /* quota space reservation, managed internally by quota code */ 1039 qsize_t i_reserved_quota; 1040 #endif 1041 1042 /* Lock protecting lists below */ 1043 spinlock_t i_completed_io_lock; 1044 /* 1045 * Completed IOs that need unwritten extents handling and have 1046 * transaction reserved 1047 */ 1048 struct list_head i_rsv_conversion_list; 1049 struct work_struct i_rsv_conversion_work; 1050 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 1051 1052 spinlock_t i_block_reservation_lock; 1053 1054 /* 1055 * Transactions that contain inode's metadata needed to complete 1056 * fsync and fdatasync, respectively. 1057 */ 1058 tid_t i_sync_tid; 1059 tid_t i_datasync_tid; 1060 1061 #ifdef CONFIG_QUOTA 1062 struct dquot *i_dquot[MAXQUOTAS]; 1063 #endif 1064 1065 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1066 __u32 i_csum_seed; 1067 1068 kprojid_t i_projid; 1069 }; 1070 1071 /* 1072 * File system states 1073 */ 1074 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1075 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1076 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1077 1078 /* 1079 * Misc. filesystem flags 1080 */ 1081 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1082 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1083 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1084 1085 /* 1086 * Mount flags set via mount options or defaults 1087 */ 1088 #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */ 1089 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1090 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1091 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1092 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1093 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1094 #define EXT4_MOUNT_ERRORS_MASK 0x00070 1095 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1096 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1097 #ifdef CONFIG_FS_DAX 1098 #define EXT4_MOUNT_DAX 0x00200 /* Direct Access */ 1099 #else 1100 #define EXT4_MOUNT_DAX 0 1101 #endif 1102 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1103 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1104 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1105 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1106 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1107 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1108 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1109 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1110 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1111 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1112 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */ 1113 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota, 1114 * enable enforcement for hidden 1115 * quota files */ 1116 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable 1117 * enforcement for hidden quota 1118 * files */ 1119 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota 1120 * enforcement */ 1121 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1122 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1123 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1124 #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */ 1125 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1126 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1127 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1128 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1129 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1130 1131 /* 1132 * Mount flags set either automatically (could not be set by mount option) 1133 * based on per file system feature or property or in special cases such as 1134 * distinguishing between explicit mount option definition and default. 1135 */ 1136 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1137 specified delalloc */ 1138 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1139 size of blocksize * 8 1140 blocks */ 1141 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1142 file systems */ 1143 1144 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1145 specified journal checksum */ 1146 1147 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1148 ~EXT4_MOUNT_##opt 1149 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1150 EXT4_MOUNT_##opt 1151 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1152 EXT4_MOUNT_##opt) 1153 1154 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1155 ~EXT4_MOUNT2_##opt 1156 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1157 EXT4_MOUNT2_##opt 1158 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1159 EXT4_MOUNT2_##opt) 1160 1161 #define ext4_test_and_set_bit __test_and_set_bit_le 1162 #define ext4_set_bit __set_bit_le 1163 #define ext4_set_bit_atomic ext2_set_bit_atomic 1164 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1165 #define ext4_clear_bit __clear_bit_le 1166 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1167 #define ext4_test_bit test_bit_le 1168 #define ext4_find_next_zero_bit find_next_zero_bit_le 1169 #define ext4_find_next_bit find_next_bit_le 1170 1171 extern void ext4_set_bits(void *bm, int cur, int len); 1172 1173 /* 1174 * Maximal mount counts between two filesystem checks 1175 */ 1176 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1177 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1178 1179 /* 1180 * Behaviour when detecting errors 1181 */ 1182 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1183 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1184 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1185 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1186 1187 /* Metadata checksum algorithm codes */ 1188 #define EXT4_CRC32C_CHKSUM 1 1189 1190 /* 1191 * Structure of the super block 1192 */ 1193 struct ext4_super_block { 1194 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1195 __le32 s_blocks_count_lo; /* Blocks count */ 1196 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1197 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1198 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1199 __le32 s_first_data_block; /* First Data Block */ 1200 __le32 s_log_block_size; /* Block size */ 1201 __le32 s_log_cluster_size; /* Allocation cluster size */ 1202 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1203 __le32 s_clusters_per_group; /* # Clusters per group */ 1204 __le32 s_inodes_per_group; /* # Inodes per group */ 1205 __le32 s_mtime; /* Mount time */ 1206 /*30*/ __le32 s_wtime; /* Write time */ 1207 __le16 s_mnt_count; /* Mount count */ 1208 __le16 s_max_mnt_count; /* Maximal mount count */ 1209 __le16 s_magic; /* Magic signature */ 1210 __le16 s_state; /* File system state */ 1211 __le16 s_errors; /* Behaviour when detecting errors */ 1212 __le16 s_minor_rev_level; /* minor revision level */ 1213 /*40*/ __le32 s_lastcheck; /* time of last check */ 1214 __le32 s_checkinterval; /* max. time between checks */ 1215 __le32 s_creator_os; /* OS */ 1216 __le32 s_rev_level; /* Revision level */ 1217 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1218 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1219 /* 1220 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1221 * 1222 * Note: the difference between the compatible feature set and 1223 * the incompatible feature set is that if there is a bit set 1224 * in the incompatible feature set that the kernel doesn't 1225 * know about, it should refuse to mount the filesystem. 1226 * 1227 * e2fsck's requirements are more strict; if it doesn't know 1228 * about a feature in either the compatible or incompatible 1229 * feature set, it must abort and not try to meddle with 1230 * things it doesn't understand... 1231 */ 1232 __le32 s_first_ino; /* First non-reserved inode */ 1233 __le16 s_inode_size; /* size of inode structure */ 1234 __le16 s_block_group_nr; /* block group # of this superblock */ 1235 __le32 s_feature_compat; /* compatible feature set */ 1236 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1237 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1238 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1239 /*78*/ char s_volume_name[16]; /* volume name */ 1240 /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */ 1241 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1242 /* 1243 * Performance hints. Directory preallocation should only 1244 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1245 */ 1246 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1247 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1248 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1249 /* 1250 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1251 */ 1252 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1253 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1254 __le32 s_journal_dev; /* device number of journal file */ 1255 __le32 s_last_orphan; /* start of list of inodes to delete */ 1256 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1257 __u8 s_def_hash_version; /* Default hash version to use */ 1258 __u8 s_jnl_backup_type; 1259 __le16 s_desc_size; /* size of group descriptor */ 1260 /*100*/ __le32 s_default_mount_opts; 1261 __le32 s_first_meta_bg; /* First metablock block group */ 1262 __le32 s_mkfs_time; /* When the filesystem was created */ 1263 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1264 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1265 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1266 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1267 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1268 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1269 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1270 __le32 s_flags; /* Miscellaneous flags */ 1271 __le16 s_raid_stride; /* RAID stride */ 1272 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1273 __le64 s_mmp_block; /* Block for multi-mount protection */ 1274 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1275 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1276 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1277 __u8 s_encryption_level; /* versioning level for encryption */ 1278 __u8 s_reserved_pad; /* Padding to next 32bits */ 1279 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1280 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1281 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1282 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1283 snapshot's future use */ 1284 __le32 s_snapshot_list; /* inode number of the head of the 1285 on-disk snapshot list */ 1286 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1287 __le32 s_error_count; /* number of fs errors */ 1288 __le32 s_first_error_time; /* first time an error happened */ 1289 __le32 s_first_error_ino; /* inode involved in first error */ 1290 __le64 s_first_error_block; /* block involved of first error */ 1291 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */ 1292 __le32 s_first_error_line; /* line number where error happened */ 1293 __le32 s_last_error_time; /* most recent time of an error */ 1294 __le32 s_last_error_ino; /* inode involved in last error */ 1295 __le32 s_last_error_line; /* line number where error happened */ 1296 __le64 s_last_error_block; /* block involved of last error */ 1297 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */ 1298 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1299 __u8 s_mount_opts[64]; 1300 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1301 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1302 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1303 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1304 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1305 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1306 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1307 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1308 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1309 __u8 s_wtime_hi; 1310 __u8 s_mtime_hi; 1311 __u8 s_mkfs_time_hi; 1312 __u8 s_lastcheck_hi; 1313 __u8 s_first_error_time_hi; 1314 __u8 s_last_error_time_hi; 1315 __u8 s_pad[2]; 1316 __le32 s_reserved[96]; /* Padding to the end of the block */ 1317 __le32 s_checksum; /* crc32c(superblock) */ 1318 }; 1319 1320 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1321 1322 #ifdef __KERNEL__ 1323 1324 /* 1325 * run-time mount flags 1326 */ 1327 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1328 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1329 #define EXT4_MF_TEST_DUMMY_ENCRYPTION 0x0004 1330 1331 #ifdef CONFIG_FS_ENCRYPTION 1332 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \ 1333 EXT4_MF_TEST_DUMMY_ENCRYPTION)) 1334 #else 1335 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0) 1336 #endif 1337 1338 /* Number of quota types we support */ 1339 #define EXT4_MAXQUOTAS 3 1340 1341 /* 1342 * fourth extended-fs super-block data in memory 1343 */ 1344 struct ext4_sb_info { 1345 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1346 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1347 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1348 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1349 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1350 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1351 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1352 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1353 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1354 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1355 unsigned long s_overhead; /* # of fs overhead clusters */ 1356 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1357 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1358 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1359 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1360 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1361 struct buffer_head **s_group_desc; 1362 unsigned int s_mount_opt; 1363 unsigned int s_mount_opt2; 1364 unsigned int s_mount_flags; 1365 unsigned int s_def_mount_opt; 1366 ext4_fsblk_t s_sb_block; 1367 atomic64_t s_resv_clusters; 1368 kuid_t s_resuid; 1369 kgid_t s_resgid; 1370 unsigned short s_mount_state; 1371 unsigned short s_pad; 1372 int s_addr_per_block_bits; 1373 int s_desc_per_block_bits; 1374 int s_inode_size; 1375 int s_first_ino; 1376 unsigned int s_inode_readahead_blks; 1377 unsigned int s_inode_goal; 1378 u32 s_hash_seed[4]; 1379 int s_def_hash_version; 1380 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1381 struct percpu_counter s_freeclusters_counter; 1382 struct percpu_counter s_freeinodes_counter; 1383 struct percpu_counter s_dirs_counter; 1384 struct percpu_counter s_dirtyclusters_counter; 1385 struct blockgroup_lock *s_blockgroup_lock; 1386 struct proc_dir_entry *s_proc; 1387 struct kobject s_kobj; 1388 struct completion s_kobj_unregister; 1389 struct super_block *s_sb; 1390 1391 /* Journaling */ 1392 struct journal_s *s_journal; 1393 struct list_head s_orphan; 1394 struct mutex s_orphan_lock; 1395 unsigned long s_ext4_flags; /* Ext4 superblock flags */ 1396 unsigned long s_commit_interval; 1397 u32 s_max_batch_time; 1398 u32 s_min_batch_time; 1399 struct block_device *journal_bdev; 1400 #ifdef CONFIG_QUOTA 1401 /* Names of quota files with journalled quota */ 1402 char __rcu *s_qf_names[EXT4_MAXQUOTAS]; 1403 int s_jquota_fmt; /* Format of quota to use */ 1404 #endif 1405 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1406 struct rb_root system_blks; 1407 1408 #ifdef EXTENTS_STATS 1409 /* ext4 extents stats */ 1410 unsigned long s_ext_min; 1411 unsigned long s_ext_max; 1412 unsigned long s_depth_max; 1413 spinlock_t s_ext_stats_lock; 1414 unsigned long s_ext_blocks; 1415 unsigned long s_ext_extents; 1416 #endif 1417 1418 /* for buddy allocator */ 1419 struct ext4_group_info ***s_group_info; 1420 struct inode *s_buddy_cache; 1421 spinlock_t s_md_lock; 1422 unsigned short *s_mb_offsets; 1423 unsigned int *s_mb_maxs; 1424 unsigned int s_group_info_size; 1425 unsigned int s_mb_free_pending; 1426 struct list_head s_freed_data_list; /* List of blocks to be freed 1427 after commit completed */ 1428 1429 /* tunables */ 1430 unsigned long s_stripe; 1431 unsigned int s_mb_stream_request; 1432 unsigned int s_mb_max_to_scan; 1433 unsigned int s_mb_min_to_scan; 1434 unsigned int s_mb_stats; 1435 unsigned int s_mb_order2_reqs; 1436 unsigned int s_mb_group_prealloc; 1437 unsigned int s_max_dir_size_kb; 1438 /* where last allocation was done - for stream allocation */ 1439 unsigned long s_mb_last_group; 1440 unsigned long s_mb_last_start; 1441 1442 /* stats for buddy allocator */ 1443 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1444 atomic_t s_bal_success; /* we found long enough chunks */ 1445 atomic_t s_bal_allocated; /* in blocks */ 1446 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1447 atomic_t s_bal_goals; /* goal hits */ 1448 atomic_t s_bal_breaks; /* too long searches */ 1449 atomic_t s_bal_2orders; /* 2^order hits */ 1450 spinlock_t s_bal_lock; 1451 unsigned long s_mb_buddies_generated; 1452 unsigned long long s_mb_generation_time; 1453 atomic_t s_mb_lost_chunks; 1454 atomic_t s_mb_preallocated; 1455 atomic_t s_mb_discarded; 1456 atomic_t s_lock_busy; 1457 1458 /* locality groups */ 1459 struct ext4_locality_group __percpu *s_locality_groups; 1460 1461 /* for write statistics */ 1462 unsigned long s_sectors_written_start; 1463 u64 s_kbytes_written; 1464 1465 /* the size of zero-out chunk */ 1466 unsigned int s_extent_max_zeroout_kb; 1467 1468 unsigned int s_log_groups_per_flex; 1469 struct flex_groups *s_flex_groups; 1470 ext4_group_t s_flex_groups_allocated; 1471 1472 /* workqueue for reserved extent conversions (buffered io) */ 1473 struct workqueue_struct *rsv_conversion_wq; 1474 1475 /* timer for periodic error stats printing */ 1476 struct timer_list s_err_report; 1477 1478 /* Lazy inode table initialization info */ 1479 struct ext4_li_request *s_li_request; 1480 /* Wait multiplier for lazy initialization thread */ 1481 unsigned int s_li_wait_mult; 1482 1483 /* Kernel thread for multiple mount protection */ 1484 struct task_struct *s_mmp_tsk; 1485 1486 /* record the last minlen when FITRIM is called. */ 1487 atomic_t s_last_trim_minblks; 1488 1489 /* Reference to checksum algorithm driver via cryptoapi */ 1490 struct crypto_shash *s_chksum_driver; 1491 1492 /* Precomputed FS UUID checksum for seeding other checksums */ 1493 __u32 s_csum_seed; 1494 1495 /* Reclaim extents from extent status tree */ 1496 struct shrinker s_es_shrinker; 1497 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1498 long s_es_nr_inode; 1499 struct ext4_es_stats s_es_stats; 1500 struct mb_cache *s_ea_block_cache; 1501 struct mb_cache *s_ea_inode_cache; 1502 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1503 1504 /* Ratelimit ext4 messages. */ 1505 struct ratelimit_state s_err_ratelimit_state; 1506 struct ratelimit_state s_warning_ratelimit_state; 1507 struct ratelimit_state s_msg_ratelimit_state; 1508 1509 /* Barrier between changing inodes' journal flags and writepages ops. */ 1510 struct percpu_rw_semaphore s_journal_flag_rwsem; 1511 struct dax_device *s_daxdev; 1512 }; 1513 1514 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1515 { 1516 return sb->s_fs_info; 1517 } 1518 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1519 { 1520 return container_of(inode, struct ext4_inode_info, vfs_inode); 1521 } 1522 1523 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1524 { 1525 return ino == EXT4_ROOT_INO || 1526 (ino >= EXT4_FIRST_INO(sb) && 1527 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1528 } 1529 1530 /* 1531 * Inode dynamic state flags 1532 */ 1533 enum { 1534 EXT4_STATE_JDATA, /* journaled data exists */ 1535 EXT4_STATE_NEW, /* inode is newly created */ 1536 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1537 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1538 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1539 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1540 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1541 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1542 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1543 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1544 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */ 1545 }; 1546 1547 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1548 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1549 { \ 1550 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1551 } \ 1552 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1553 { \ 1554 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1555 } \ 1556 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1557 { \ 1558 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1559 } 1560 1561 /* Add these declarations here only so that these functions can be 1562 * found by name. Otherwise, they are very hard to locate. */ 1563 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1564 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1565 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1566 EXT4_INODE_BIT_FNS(flag, flags, 0) 1567 1568 /* Add these declarations here only so that these functions can be 1569 * found by name. Otherwise, they are very hard to locate. */ 1570 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1571 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1572 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1573 #if (BITS_PER_LONG < 64) 1574 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1575 1576 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1577 { 1578 (ei)->i_state_flags = 0; 1579 } 1580 #else 1581 EXT4_INODE_BIT_FNS(state, flags, 32) 1582 1583 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1584 { 1585 /* We depend on the fact that callers will set i_flags */ 1586 } 1587 #endif 1588 #else 1589 /* Assume that user mode programs are passing in an ext4fs superblock, not 1590 * a kernel struct super_block. This will allow us to call the feature-test 1591 * macros from user land. */ 1592 #define EXT4_SB(sb) (sb) 1593 #endif 1594 1595 /* 1596 * Returns true if the inode is inode is encrypted 1597 */ 1598 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1599 1600 /* 1601 * Codes for operating systems 1602 */ 1603 #define EXT4_OS_LINUX 0 1604 #define EXT4_OS_HURD 1 1605 #define EXT4_OS_MASIX 2 1606 #define EXT4_OS_FREEBSD 3 1607 #define EXT4_OS_LITES 4 1608 1609 /* 1610 * Revision levels 1611 */ 1612 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1613 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1614 1615 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1616 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1617 1618 #define EXT4_GOOD_OLD_INODE_SIZE 128 1619 1620 /* 1621 * Feature set definitions 1622 */ 1623 1624 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1625 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1626 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1627 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1628 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1629 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1630 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1631 1632 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1633 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1634 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1635 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1636 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1637 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1638 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1639 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1640 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1641 /* 1642 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1643 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1644 * all other data structures' checksums. However, the METADATA_CSUM and 1645 * GDT_CSUM bits are mutually exclusive. 1646 */ 1647 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1648 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1649 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 1650 1651 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1652 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1653 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1654 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1655 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1656 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1657 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1658 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1659 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1660 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1661 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1662 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 1663 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1664 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1665 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1666 1667 extern void ext4_update_dynamic_rev(struct super_block *sb); 1668 1669 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 1670 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1671 { \ 1672 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1673 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 1674 } \ 1675 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1676 { \ 1677 ext4_update_dynamic_rev(sb); \ 1678 EXT4_SB(sb)->s_es->s_feature_compat |= \ 1679 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1680 } \ 1681 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1682 { \ 1683 EXT4_SB(sb)->s_es->s_feature_compat &= \ 1684 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1685 } 1686 1687 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 1688 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1689 { \ 1690 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1691 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 1692 } \ 1693 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1694 { \ 1695 ext4_update_dynamic_rev(sb); \ 1696 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 1697 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1698 } \ 1699 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1700 { \ 1701 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 1702 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1703 } 1704 1705 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 1706 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1707 { \ 1708 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1709 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 1710 } \ 1711 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1712 { \ 1713 ext4_update_dynamic_rev(sb); \ 1714 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 1715 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1716 } \ 1717 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1718 { \ 1719 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 1720 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1721 } 1722 1723 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 1724 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 1725 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 1726 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 1727 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 1728 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 1729 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 1730 1731 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 1732 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 1733 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 1734 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 1735 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 1736 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 1737 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 1738 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 1739 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 1740 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 1741 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 1742 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 1743 1744 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 1745 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 1746 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 1747 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 1748 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 1749 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 1750 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 1751 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 1752 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 1753 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 1754 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 1755 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 1756 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 1757 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 1758 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 1759 1760 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1761 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1762 EXT4_FEATURE_INCOMPAT_META_BG) 1763 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1764 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1765 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1766 1767 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1768 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1769 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1770 EXT4_FEATURE_INCOMPAT_META_BG) 1771 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1772 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1773 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1774 1775 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1776 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1777 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1778 EXT4_FEATURE_INCOMPAT_META_BG| \ 1779 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1780 EXT4_FEATURE_INCOMPAT_64BIT| \ 1781 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1782 EXT4_FEATURE_INCOMPAT_EA_INODE| \ 1783 EXT4_FEATURE_INCOMPAT_MMP | \ 1784 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 1785 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 1786 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \ 1787 EXT4_FEATURE_INCOMPAT_LARGEDIR) 1788 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1789 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1790 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1791 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1792 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1793 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1794 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1795 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1796 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1797 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 1798 EXT4_FEATURE_RO_COMPAT_PROJECT) 1799 1800 #define EXTN_FEATURE_FUNCS(ver) \ 1801 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 1802 { \ 1803 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1804 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 1805 } \ 1806 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 1807 { \ 1808 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1809 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 1810 } \ 1811 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 1812 { \ 1813 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1814 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 1815 } 1816 1817 EXTN_FEATURE_FUNCS(2) 1818 EXTN_FEATURE_FUNCS(3) 1819 EXTN_FEATURE_FUNCS(4) 1820 1821 static inline bool ext4_has_compat_features(struct super_block *sb) 1822 { 1823 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 1824 } 1825 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 1826 { 1827 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 1828 } 1829 static inline bool ext4_has_incompat_features(struct super_block *sb) 1830 { 1831 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 1832 } 1833 1834 /* 1835 * Superblock flags 1836 */ 1837 #define EXT4_FLAGS_RESIZING 0 1838 #define EXT4_FLAGS_SHUTDOWN 1 1839 1840 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi) 1841 { 1842 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 1843 } 1844 1845 1846 /* 1847 * Default values for user and/or group using reserved blocks 1848 */ 1849 #define EXT4_DEF_RESUID 0 1850 #define EXT4_DEF_RESGID 0 1851 1852 /* 1853 * Default project ID 1854 */ 1855 #define EXT4_DEF_PROJID 0 1856 1857 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1858 1859 /* 1860 * Default mount options 1861 */ 1862 #define EXT4_DEFM_DEBUG 0x0001 1863 #define EXT4_DEFM_BSDGROUPS 0x0002 1864 #define EXT4_DEFM_XATTR_USER 0x0004 1865 #define EXT4_DEFM_ACL 0x0008 1866 #define EXT4_DEFM_UID16 0x0010 1867 #define EXT4_DEFM_JMODE 0x0060 1868 #define EXT4_DEFM_JMODE_DATA 0x0020 1869 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1870 #define EXT4_DEFM_JMODE_WBACK 0x0060 1871 #define EXT4_DEFM_NOBARRIER 0x0100 1872 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1873 #define EXT4_DEFM_DISCARD 0x0400 1874 #define EXT4_DEFM_NODELALLOC 0x0800 1875 1876 /* 1877 * Default journal batch times 1878 */ 1879 #define EXT4_DEF_MIN_BATCH_TIME 0 1880 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1881 1882 /* 1883 * Minimum number of groups in a flexgroup before we separate out 1884 * directories into the first block group of a flexgroup 1885 */ 1886 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1887 1888 /* 1889 * Structure of a directory entry 1890 */ 1891 #define EXT4_NAME_LEN 255 1892 1893 struct ext4_dir_entry { 1894 __le32 inode; /* Inode number */ 1895 __le16 rec_len; /* Directory entry length */ 1896 __le16 name_len; /* Name length */ 1897 char name[EXT4_NAME_LEN]; /* File name */ 1898 }; 1899 1900 /* 1901 * The new version of the directory entry. Since EXT4 structures are 1902 * stored in intel byte order, and the name_len field could never be 1903 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1904 * file_type field. 1905 */ 1906 struct ext4_dir_entry_2 { 1907 __le32 inode; /* Inode number */ 1908 __le16 rec_len; /* Directory entry length */ 1909 __u8 name_len; /* Name length */ 1910 __u8 file_type; 1911 char name[EXT4_NAME_LEN]; /* File name */ 1912 }; 1913 1914 /* 1915 * This is a bogus directory entry at the end of each leaf block that 1916 * records checksums. 1917 */ 1918 struct ext4_dir_entry_tail { 1919 __le32 det_reserved_zero1; /* Pretend to be unused */ 1920 __le16 det_rec_len; /* 12 */ 1921 __u8 det_reserved_zero2; /* Zero name length */ 1922 __u8 det_reserved_ft; /* 0xDE, fake file type */ 1923 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1924 }; 1925 1926 #define EXT4_DIRENT_TAIL(block, blocksize) \ 1927 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 1928 ((blocksize) - \ 1929 sizeof(struct ext4_dir_entry_tail)))) 1930 1931 /* 1932 * Ext4 directory file types. Only the low 3 bits are used. The 1933 * other bits are reserved for now. 1934 */ 1935 #define EXT4_FT_UNKNOWN 0 1936 #define EXT4_FT_REG_FILE 1 1937 #define EXT4_FT_DIR 2 1938 #define EXT4_FT_CHRDEV 3 1939 #define EXT4_FT_BLKDEV 4 1940 #define EXT4_FT_FIFO 5 1941 #define EXT4_FT_SOCK 6 1942 #define EXT4_FT_SYMLINK 7 1943 1944 #define EXT4_FT_MAX 8 1945 1946 #define EXT4_FT_DIR_CSUM 0xDE 1947 1948 /* 1949 * EXT4_DIR_PAD defines the directory entries boundaries 1950 * 1951 * NOTE: It must be a multiple of 4 1952 */ 1953 #define EXT4_DIR_PAD 4 1954 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1955 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1956 ~EXT4_DIR_ROUND) 1957 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1958 1959 /* 1960 * If we ever get support for fs block sizes > page_size, we'll need 1961 * to remove the #if statements in the next two functions... 1962 */ 1963 static inline unsigned int 1964 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1965 { 1966 unsigned len = le16_to_cpu(dlen); 1967 1968 #if (PAGE_SIZE >= 65536) 1969 if (len == EXT4_MAX_REC_LEN || len == 0) 1970 return blocksize; 1971 return (len & 65532) | ((len & 3) << 16); 1972 #else 1973 return len; 1974 #endif 1975 } 1976 1977 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1978 { 1979 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1980 BUG(); 1981 #if (PAGE_SIZE >= 65536) 1982 if (len < 65536) 1983 return cpu_to_le16(len); 1984 if (len == blocksize) { 1985 if (blocksize == 65536) 1986 return cpu_to_le16(EXT4_MAX_REC_LEN); 1987 else 1988 return cpu_to_le16(0); 1989 } 1990 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 1991 #else 1992 return cpu_to_le16(len); 1993 #endif 1994 } 1995 1996 /* 1997 * Hash Tree Directory indexing 1998 * (c) Daniel Phillips, 2001 1999 */ 2000 2001 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2002 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2003 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \ 2004 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir))) 2005 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2006 2007 /* Legal values for the dx_root hash_version field: */ 2008 2009 #define DX_HASH_LEGACY 0 2010 #define DX_HASH_HALF_MD4 1 2011 #define DX_HASH_TEA 2 2012 #define DX_HASH_LEGACY_UNSIGNED 3 2013 #define DX_HASH_HALF_MD4_UNSIGNED 4 2014 #define DX_HASH_TEA_UNSIGNED 5 2015 2016 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 2017 const void *address, unsigned int length) 2018 { 2019 struct { 2020 struct shash_desc shash; 2021 char ctx[4]; 2022 } desc; 2023 2024 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2025 2026 desc.shash.tfm = sbi->s_chksum_driver; 2027 desc.shash.flags = 0; 2028 *(u32 *)desc.ctx = crc; 2029 2030 BUG_ON(crypto_shash_update(&desc.shash, address, length)); 2031 2032 return *(u32 *)desc.ctx; 2033 } 2034 2035 #ifdef __KERNEL__ 2036 2037 /* hash info structure used by the directory hash */ 2038 struct dx_hash_info 2039 { 2040 u32 hash; 2041 u32 minor_hash; 2042 int hash_version; 2043 u32 *seed; 2044 }; 2045 2046 2047 /* 32 and 64 bit signed EOF for dx directories */ 2048 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2049 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2050 2051 2052 /* 2053 * Control parameters used by ext4_htree_next_block 2054 */ 2055 #define HASH_NB_ALWAYS 1 2056 2057 struct ext4_filename { 2058 const struct qstr *usr_fname; 2059 struct fscrypt_str disk_name; 2060 struct dx_hash_info hinfo; 2061 #ifdef CONFIG_FS_ENCRYPTION 2062 struct fscrypt_str crypto_buf; 2063 #endif 2064 }; 2065 2066 #define fname_name(p) ((p)->disk_name.name) 2067 #define fname_len(p) ((p)->disk_name.len) 2068 2069 /* 2070 * Describe an inode's exact location on disk and in memory 2071 */ 2072 struct ext4_iloc 2073 { 2074 struct buffer_head *bh; 2075 unsigned long offset; 2076 ext4_group_t block_group; 2077 }; 2078 2079 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2080 { 2081 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2082 } 2083 2084 static inline bool ext4_is_quota_file(struct inode *inode) 2085 { 2086 return IS_NOQUOTA(inode) && 2087 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL); 2088 } 2089 2090 /* 2091 * This structure is stuffed into the struct file's private_data field 2092 * for directories. It is where we put information so that we can do 2093 * readdir operations in hash tree order. 2094 */ 2095 struct dir_private_info { 2096 struct rb_root root; 2097 struct rb_node *curr_node; 2098 struct fname *extra_fname; 2099 loff_t last_pos; 2100 __u32 curr_hash; 2101 __u32 curr_minor_hash; 2102 __u32 next_hash; 2103 }; 2104 2105 /* calculate the first block number of the group */ 2106 static inline ext4_fsblk_t 2107 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2108 { 2109 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2110 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2111 } 2112 2113 /* 2114 * Special error return code only used by dx_probe() and its callers. 2115 */ 2116 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2117 2118 /* htree levels for ext4 */ 2119 #define EXT4_HTREE_LEVEL_COMPAT 2 2120 #define EXT4_HTREE_LEVEL 3 2121 2122 static inline int ext4_dir_htree_level(struct super_block *sb) 2123 { 2124 return ext4_has_feature_largedir(sb) ? 2125 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT; 2126 } 2127 2128 /* 2129 * Timeout and state flag for lazy initialization inode thread. 2130 */ 2131 #define EXT4_DEF_LI_WAIT_MULT 10 2132 #define EXT4_DEF_LI_MAX_START_DELAY 5 2133 #define EXT4_LAZYINIT_QUIT 0x0001 2134 #define EXT4_LAZYINIT_RUNNING 0x0002 2135 2136 /* 2137 * Lazy inode table initialization info 2138 */ 2139 struct ext4_lazy_init { 2140 unsigned long li_state; 2141 struct list_head li_request_list; 2142 struct mutex li_list_mtx; 2143 }; 2144 2145 struct ext4_li_request { 2146 struct super_block *lr_super; 2147 struct ext4_sb_info *lr_sbi; 2148 ext4_group_t lr_next_group; 2149 struct list_head lr_request; 2150 unsigned long lr_next_sched; 2151 unsigned long lr_timeout; 2152 }; 2153 2154 struct ext4_features { 2155 struct kobject f_kobj; 2156 struct completion f_kobj_unregister; 2157 }; 2158 2159 /* 2160 * This structure will be used for multiple mount protection. It will be 2161 * written into the block number saved in the s_mmp_block field in the 2162 * superblock. Programs that check MMP should assume that if 2163 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2164 * to use the filesystem, regardless of how old the timestamp is. 2165 */ 2166 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2167 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2168 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2169 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2170 2171 struct mmp_struct { 2172 __le32 mmp_magic; /* Magic number for MMP */ 2173 __le32 mmp_seq; /* Sequence no. updated periodically */ 2174 2175 /* 2176 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2177 * purposes and do not affect the correctness of the algorithm 2178 */ 2179 __le64 mmp_time; /* Time last updated */ 2180 char mmp_nodename[64]; /* Node which last updated MMP block */ 2181 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2182 2183 /* 2184 * mmp_check_interval is used to verify if the MMP block has been 2185 * updated on the block device. The value is updated based on the 2186 * maximum time to write the MMP block during an update cycle. 2187 */ 2188 __le16 mmp_check_interval; 2189 2190 __le16 mmp_pad1; 2191 __le32 mmp_pad2[226]; 2192 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2193 }; 2194 2195 /* arguments passed to the mmp thread */ 2196 struct mmpd_data { 2197 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2198 struct super_block *sb; /* super block of the fs */ 2199 }; 2200 2201 /* 2202 * Check interval multiplier 2203 * The MMP block is written every update interval and initially checked every 2204 * update interval x the multiplier (the value is then adapted based on the 2205 * write latency). The reason is that writes can be delayed under load and we 2206 * don't want readers to incorrectly assume that the filesystem is no longer 2207 * in use. 2208 */ 2209 #define EXT4_MMP_CHECK_MULT 2UL 2210 2211 /* 2212 * Minimum interval for MMP checking in seconds. 2213 */ 2214 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2215 2216 /* 2217 * Maximum interval for MMP checking in seconds. 2218 */ 2219 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2220 2221 /* 2222 * Function prototypes 2223 */ 2224 2225 /* 2226 * Ok, these declarations are also in <linux/kernel.h> but none of the 2227 * ext4 source programs needs to include it so they are duplicated here. 2228 */ 2229 # define NORET_TYPE /**/ 2230 # define ATTRIB_NORET __attribute__((noreturn)) 2231 # define NORET_AND noreturn, 2232 2233 /* bitmap.c */ 2234 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2235 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2236 struct ext4_group_desc *gdp, 2237 struct buffer_head *bh, int sz); 2238 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2239 struct ext4_group_desc *gdp, 2240 struct buffer_head *bh, int sz); 2241 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2242 struct ext4_group_desc *gdp, 2243 struct buffer_head *bh); 2244 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2245 struct ext4_group_desc *gdp, 2246 struct buffer_head *bh); 2247 2248 /* balloc.c */ 2249 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2250 ext4_fsblk_t blocknr, 2251 ext4_group_t *blockgrpp, 2252 ext4_grpblk_t *offsetp); 2253 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2254 ext4_fsblk_t block); 2255 2256 extern unsigned int ext4_block_group(struct super_block *sb, 2257 ext4_fsblk_t blocknr); 2258 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2259 ext4_fsblk_t blocknr); 2260 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2261 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2262 ext4_group_t group); 2263 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2264 ext4_fsblk_t goal, 2265 unsigned int flags, 2266 unsigned long *count, 2267 int *errp); 2268 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2269 s64 nclusters, unsigned int flags); 2270 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2271 extern void ext4_check_blocks_bitmap(struct super_block *); 2272 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2273 ext4_group_t block_group, 2274 struct buffer_head ** bh); 2275 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2276 2277 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2278 ext4_group_t block_group); 2279 extern int ext4_wait_block_bitmap(struct super_block *sb, 2280 ext4_group_t block_group, 2281 struct buffer_head *bh); 2282 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2283 ext4_group_t block_group); 2284 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2285 ext4_group_t block_group, 2286 struct ext4_group_desc *gdp); 2287 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2288 2289 #ifdef CONFIG_FS_ENCRYPTION 2290 static inline int ext4_fname_setup_filename(struct inode *dir, 2291 const struct qstr *iname, 2292 int lookup, struct ext4_filename *fname) 2293 { 2294 struct fscrypt_name name; 2295 int err; 2296 2297 memset(fname, 0, sizeof(struct ext4_filename)); 2298 2299 err = fscrypt_setup_filename(dir, iname, lookup, &name); 2300 2301 fname->usr_fname = name.usr_fname; 2302 fname->disk_name = name.disk_name; 2303 fname->hinfo.hash = name.hash; 2304 fname->hinfo.minor_hash = name.minor_hash; 2305 fname->crypto_buf = name.crypto_buf; 2306 return err; 2307 } 2308 2309 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2310 { 2311 struct fscrypt_name name; 2312 2313 name.crypto_buf = fname->crypto_buf; 2314 fscrypt_free_filename(&name); 2315 2316 fname->crypto_buf.name = NULL; 2317 fname->usr_fname = NULL; 2318 fname->disk_name.name = NULL; 2319 } 2320 #else 2321 static inline int ext4_fname_setup_filename(struct inode *dir, 2322 const struct qstr *iname, 2323 int lookup, struct ext4_filename *fname) 2324 { 2325 fname->usr_fname = iname; 2326 fname->disk_name.name = (unsigned char *) iname->name; 2327 fname->disk_name.len = iname->len; 2328 return 0; 2329 } 2330 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { } 2331 2332 #endif 2333 2334 /* dir.c */ 2335 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2336 struct file *, 2337 struct ext4_dir_entry_2 *, 2338 struct buffer_head *, char *, int, 2339 unsigned int); 2340 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2341 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2342 (de), (bh), (buf), (size), (offset))) 2343 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2344 __u32 minor_hash, 2345 struct ext4_dir_entry_2 *dirent, 2346 struct fscrypt_str *ent_name); 2347 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2348 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2349 struct buffer_head *bh, 2350 void *buf, int buf_size, 2351 struct ext4_filename *fname, 2352 struct ext4_dir_entry_2 **dest_de); 2353 void ext4_insert_dentry(struct inode *inode, 2354 struct ext4_dir_entry_2 *de, 2355 int buf_size, 2356 struct ext4_filename *fname); 2357 static inline void ext4_update_dx_flag(struct inode *inode) 2358 { 2359 if (!ext4_has_feature_dir_index(inode->i_sb)) 2360 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2361 } 2362 static const unsigned char ext4_filetype_table[] = { 2363 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2364 }; 2365 2366 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2367 { 2368 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2369 return DT_UNKNOWN; 2370 2371 return ext4_filetype_table[filetype]; 2372 } 2373 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2374 void *buf, int buf_size); 2375 2376 /* fsync.c */ 2377 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2378 2379 /* hash.c */ 2380 extern int ext4fs_dirhash(const char *name, int len, struct 2381 dx_hash_info *hinfo); 2382 2383 /* ialloc.c */ 2384 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2385 const struct qstr *qstr, __u32 goal, 2386 uid_t *owner, __u32 i_flags, 2387 int handle_type, unsigned int line_no, 2388 int nblocks); 2389 2390 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \ 2391 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2392 i_flags, 0, 0, 0) 2393 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2394 type, nblocks) \ 2395 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2396 0, (type), __LINE__, (nblocks)) 2397 2398 2399 extern void ext4_free_inode(handle_t *, struct inode *); 2400 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2401 extern unsigned long ext4_count_free_inodes(struct super_block *); 2402 extern unsigned long ext4_count_dirs(struct super_block *); 2403 extern void ext4_check_inodes_bitmap(struct super_block *); 2404 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2405 extern int ext4_init_inode_table(struct super_block *sb, 2406 ext4_group_t group, int barrier); 2407 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2408 2409 /* mballoc.c */ 2410 extern const struct seq_operations ext4_mb_seq_groups_ops; 2411 extern long ext4_mb_stats; 2412 extern long ext4_mb_max_to_scan; 2413 extern int ext4_mb_init(struct super_block *); 2414 extern int ext4_mb_release(struct super_block *); 2415 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2416 struct ext4_allocation_request *, int *); 2417 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2418 extern void ext4_discard_preallocations(struct inode *); 2419 extern int __init ext4_init_mballoc(void); 2420 extern void ext4_exit_mballoc(void); 2421 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2422 struct buffer_head *bh, ext4_fsblk_t block, 2423 unsigned long count, int flags); 2424 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2425 ext4_group_t ngroups); 2426 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2427 ext4_group_t i, struct ext4_group_desc *desc); 2428 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2429 ext4_fsblk_t block, unsigned long count); 2430 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2431 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid); 2432 2433 /* inode.c */ 2434 int ext4_inode_is_fast_symlink(struct inode *inode); 2435 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2436 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2437 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count, 2438 bool wait, struct buffer_head **bhs); 2439 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2440 struct buffer_head *bh_result, int create); 2441 int ext4_get_block(struct inode *inode, sector_t iblock, 2442 struct buffer_head *bh_result, int create); 2443 int ext4_dio_get_block(struct inode *inode, sector_t iblock, 2444 struct buffer_head *bh_result, int create); 2445 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2446 struct buffer_head *bh, int create); 2447 int ext4_walk_page_buffers(handle_t *handle, 2448 struct buffer_head *head, 2449 unsigned from, 2450 unsigned to, 2451 int *partial, 2452 int (*fn)(handle_t *handle, 2453 struct buffer_head *bh)); 2454 int do_journal_get_write_access(handle_t *handle, 2455 struct buffer_head *bh); 2456 #define FALL_BACK_TO_NONDELALLOC 1 2457 #define CONVERT_INLINE_DATA 2 2458 2459 typedef enum { 2460 EXT4_IGET_NORMAL = 0, 2461 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */ 2462 EXT4_IGET_HANDLE = 0x0002 /* Inode # is from a handle */ 2463 } ext4_iget_flags; 2464 2465 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, 2466 ext4_iget_flags flags, const char *function, 2467 unsigned int line); 2468 2469 #define ext4_iget(sb, ino, flags) \ 2470 __ext4_iget((sb), (ino), (flags), __func__, __LINE__) 2471 2472 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2473 extern int ext4_setattr(struct dentry *, struct iattr *); 2474 extern int ext4_getattr(const struct path *, struct kstat *, u32, unsigned int); 2475 extern void ext4_evict_inode(struct inode *); 2476 extern void ext4_clear_inode(struct inode *); 2477 extern int ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int); 2478 extern int ext4_sync_inode(handle_t *, struct inode *); 2479 extern void ext4_dirty_inode(struct inode *, int); 2480 extern int ext4_change_inode_journal_flag(struct inode *, int); 2481 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2482 extern int ext4_inode_attach_jinode(struct inode *inode); 2483 extern int ext4_can_truncate(struct inode *inode); 2484 extern int ext4_truncate(struct inode *); 2485 extern int ext4_break_layouts(struct inode *); 2486 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2487 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 2488 extern void ext4_set_inode_flags(struct inode *); 2489 extern int ext4_alloc_da_blocks(struct inode *inode); 2490 extern void ext4_set_aops(struct inode *inode); 2491 extern int ext4_writepage_trans_blocks(struct inode *); 2492 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2493 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2494 loff_t lstart, loff_t lend); 2495 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf); 2496 extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf); 2497 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2498 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 2499 extern void ext4_da_release_space(struct inode *inode, int to_free); 2500 extern void ext4_da_update_reserve_space(struct inode *inode, 2501 int used, int quota_claim); 2502 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 2503 ext4_fsblk_t pblk, ext4_lblk_t len); 2504 2505 /* indirect.c */ 2506 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2507 struct ext4_map_blocks *map, int flags); 2508 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2509 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2510 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2511 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2512 ext4_lblk_t start, ext4_lblk_t end); 2513 2514 /* ioctl.c */ 2515 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2516 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2517 2518 /* migrate.c */ 2519 extern int ext4_ext_migrate(struct inode *); 2520 extern int ext4_ind_migrate(struct inode *inode); 2521 2522 /* namei.c */ 2523 extern int ext4_dirent_csum_verify(struct inode *inode, 2524 struct ext4_dir_entry *dirent); 2525 extern int ext4_orphan_add(handle_t *, struct inode *); 2526 extern int ext4_orphan_del(handle_t *, struct inode *); 2527 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2528 __u32 start_minor_hash, __u32 *next_hash); 2529 extern int ext4_search_dir(struct buffer_head *bh, 2530 char *search_buf, 2531 int buf_size, 2532 struct inode *dir, 2533 struct ext4_filename *fname, 2534 unsigned int offset, 2535 struct ext4_dir_entry_2 **res_dir); 2536 extern int ext4_generic_delete_entry(handle_t *handle, 2537 struct inode *dir, 2538 struct ext4_dir_entry_2 *de_del, 2539 struct buffer_head *bh, 2540 void *entry_buf, 2541 int buf_size, 2542 int csum_size); 2543 extern bool ext4_empty_dir(struct inode *inode); 2544 2545 /* resize.c */ 2546 extern int ext4_group_add(struct super_block *sb, 2547 struct ext4_new_group_data *input); 2548 extern int ext4_group_extend(struct super_block *sb, 2549 struct ext4_super_block *es, 2550 ext4_fsblk_t n_blocks_count); 2551 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2552 2553 /* super.c */ 2554 extern struct buffer_head *ext4_sb_bread(struct super_block *sb, 2555 sector_t block, int op_flags); 2556 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 2557 extern int ext4_calculate_overhead(struct super_block *sb); 2558 extern void ext4_superblock_csum_set(struct super_block *sb); 2559 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 2560 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 2561 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2562 ext4_group_t ngroup); 2563 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2564 char nbuf[16]); 2565 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb, 2566 ext4_group_t block_group, 2567 unsigned int flags); 2568 2569 extern __printf(4, 5) 2570 void __ext4_error(struct super_block *, const char *, unsigned int, 2571 const char *, ...); 2572 extern __printf(5, 6) 2573 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2574 const char *, ...); 2575 extern __printf(5, 6) 2576 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2577 const char *, ...); 2578 extern void __ext4_std_error(struct super_block *, const char *, 2579 unsigned int, int); 2580 extern __printf(4, 5) 2581 void __ext4_abort(struct super_block *, const char *, unsigned int, 2582 const char *, ...); 2583 extern __printf(4, 5) 2584 void __ext4_warning(struct super_block *, const char *, unsigned int, 2585 const char *, ...); 2586 extern __printf(4, 5) 2587 void __ext4_warning_inode(const struct inode *inode, const char *function, 2588 unsigned int line, const char *fmt, ...); 2589 extern __printf(3, 4) 2590 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2591 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2592 const char *, unsigned int, const char *); 2593 extern __printf(7, 8) 2594 void __ext4_grp_locked_error(const char *, unsigned int, 2595 struct super_block *, ext4_group_t, 2596 unsigned long, ext4_fsblk_t, 2597 const char *, ...); 2598 2599 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 2600 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 2601 2602 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 2603 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 2604 2605 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 2606 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 2607 2608 #ifdef CONFIG_PRINTK 2609 2610 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2611 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__) 2612 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2613 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2614 #define ext4_error(sb, fmt, ...) \ 2615 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2616 #define ext4_abort(sb, fmt, ...) \ 2617 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2618 #define ext4_warning(sb, fmt, ...) \ 2619 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2620 #define ext4_warning_inode(inode, fmt, ...) \ 2621 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 2622 #define ext4_msg(sb, level, fmt, ...) \ 2623 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 2624 #define dump_mmp_msg(sb, mmp, msg) \ 2625 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 2626 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2627 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 2628 fmt, ##__VA_ARGS__) 2629 2630 #else 2631 2632 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2633 do { \ 2634 no_printk(fmt, ##__VA_ARGS__); \ 2635 __ext4_error_inode(inode, "", 0, block, " "); \ 2636 } while (0) 2637 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2638 do { \ 2639 no_printk(fmt, ##__VA_ARGS__); \ 2640 __ext4_error_file(file, "", 0, block, " "); \ 2641 } while (0) 2642 #define ext4_error(sb, fmt, ...) \ 2643 do { \ 2644 no_printk(fmt, ##__VA_ARGS__); \ 2645 __ext4_error(sb, "", 0, " "); \ 2646 } while (0) 2647 #define ext4_abort(sb, fmt, ...) \ 2648 do { \ 2649 no_printk(fmt, ##__VA_ARGS__); \ 2650 __ext4_abort(sb, "", 0, " "); \ 2651 } while (0) 2652 #define ext4_warning(sb, fmt, ...) \ 2653 do { \ 2654 no_printk(fmt, ##__VA_ARGS__); \ 2655 __ext4_warning(sb, "", 0, " "); \ 2656 } while (0) 2657 #define ext4_warning_inode(inode, fmt, ...) \ 2658 do { \ 2659 no_printk(fmt, ##__VA_ARGS__); \ 2660 __ext4_warning_inode(inode, "", 0, " "); \ 2661 } while (0) 2662 #define ext4_msg(sb, level, fmt, ...) \ 2663 do { \ 2664 no_printk(fmt, ##__VA_ARGS__); \ 2665 __ext4_msg(sb, "", " "); \ 2666 } while (0) 2667 #define dump_mmp_msg(sb, mmp, msg) \ 2668 __dump_mmp_msg(sb, mmp, "", 0, "") 2669 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2670 do { \ 2671 no_printk(fmt, ##__VA_ARGS__); \ 2672 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 2673 } while (0) 2674 2675 #endif 2676 2677 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2678 __u32 compat); 2679 extern int ext4_update_rocompat_feature(handle_t *handle, 2680 struct super_block *sb, __u32 rocompat); 2681 extern int ext4_update_incompat_feature(handle_t *handle, 2682 struct super_block *sb, __u32 incompat); 2683 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2684 struct ext4_group_desc *bg); 2685 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2686 struct ext4_group_desc *bg); 2687 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2688 struct ext4_group_desc *bg); 2689 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2690 struct ext4_group_desc *bg); 2691 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2692 struct ext4_group_desc *bg); 2693 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2694 struct ext4_group_desc *bg); 2695 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2696 struct ext4_group_desc *bg); 2697 extern void ext4_block_bitmap_set(struct super_block *sb, 2698 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2699 extern void ext4_inode_bitmap_set(struct super_block *sb, 2700 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2701 extern void ext4_inode_table_set(struct super_block *sb, 2702 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2703 extern void ext4_free_group_clusters_set(struct super_block *sb, 2704 struct ext4_group_desc *bg, 2705 __u32 count); 2706 extern void ext4_free_inodes_set(struct super_block *sb, 2707 struct ext4_group_desc *bg, __u32 count); 2708 extern void ext4_used_dirs_set(struct super_block *sb, 2709 struct ext4_group_desc *bg, __u32 count); 2710 extern void ext4_itable_unused_set(struct super_block *sb, 2711 struct ext4_group_desc *bg, __u32 count); 2712 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2713 struct ext4_group_desc *gdp); 2714 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2715 struct ext4_group_desc *gdp); 2716 extern int ext4_register_li_request(struct super_block *sb, 2717 ext4_group_t first_not_zeroed); 2718 2719 static inline int ext4_has_metadata_csum(struct super_block *sb) 2720 { 2721 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 2722 !EXT4_SB(sb)->s_chksum_driver); 2723 2724 return ext4_has_feature_metadata_csum(sb) && 2725 (EXT4_SB(sb)->s_chksum_driver != NULL); 2726 } 2727 2728 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2729 { 2730 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb); 2731 } 2732 2733 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2734 { 2735 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2736 le32_to_cpu(es->s_blocks_count_lo); 2737 } 2738 2739 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2740 { 2741 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2742 le32_to_cpu(es->s_r_blocks_count_lo); 2743 } 2744 2745 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2746 { 2747 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2748 le32_to_cpu(es->s_free_blocks_count_lo); 2749 } 2750 2751 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2752 ext4_fsblk_t blk) 2753 { 2754 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2755 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2756 } 2757 2758 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2759 ext4_fsblk_t blk) 2760 { 2761 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2762 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2763 } 2764 2765 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2766 ext4_fsblk_t blk) 2767 { 2768 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2769 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2770 } 2771 2772 static inline loff_t ext4_isize(struct super_block *sb, 2773 struct ext4_inode *raw_inode) 2774 { 2775 if (ext4_has_feature_largedir(sb) || 2776 S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2777 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2778 le32_to_cpu(raw_inode->i_size_lo); 2779 2780 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2781 } 2782 2783 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2784 { 2785 raw_inode->i_size_lo = cpu_to_le32(i_size); 2786 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2787 } 2788 2789 static inline 2790 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2791 ext4_group_t group) 2792 { 2793 struct ext4_group_info ***grp_info; 2794 long indexv, indexh; 2795 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 2796 grp_info = EXT4_SB(sb)->s_group_info; 2797 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2798 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2799 return grp_info[indexv][indexh]; 2800 } 2801 2802 /* 2803 * Reading s_groups_count requires using smp_rmb() afterwards. See 2804 * the locking protocol documented in the comments of ext4_group_add() 2805 * in resize.c 2806 */ 2807 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2808 { 2809 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2810 2811 smp_rmb(); 2812 return ngroups; 2813 } 2814 2815 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2816 ext4_group_t block_group) 2817 { 2818 return block_group >> sbi->s_log_groups_per_flex; 2819 } 2820 2821 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2822 { 2823 return 1 << sbi->s_log_groups_per_flex; 2824 } 2825 2826 #define ext4_std_error(sb, errno) \ 2827 do { \ 2828 if ((errno)) \ 2829 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2830 } while (0) 2831 2832 #ifdef CONFIG_SMP 2833 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2834 * counters. So we need to make sure we have free clusters more 2835 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2836 */ 2837 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2838 #else 2839 #define EXT4_FREECLUSTERS_WATERMARK 0 2840 #endif 2841 2842 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 2843 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2844 { 2845 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 2846 !inode_is_locked(inode)); 2847 down_write(&EXT4_I(inode)->i_data_sem); 2848 if (newsize > EXT4_I(inode)->i_disksize) 2849 EXT4_I(inode)->i_disksize = newsize; 2850 up_write(&EXT4_I(inode)->i_data_sem); 2851 } 2852 2853 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 2854 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 2855 { 2856 int changed = 0; 2857 2858 if (newsize > inode->i_size) { 2859 i_size_write(inode, newsize); 2860 changed = 1; 2861 } 2862 if (newsize > EXT4_I(inode)->i_disksize) { 2863 ext4_update_i_disksize(inode, newsize); 2864 changed |= 2; 2865 } 2866 return changed; 2867 } 2868 2869 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 2870 loff_t len); 2871 2872 struct ext4_group_info { 2873 unsigned long bb_state; 2874 struct rb_root bb_free_root; 2875 ext4_grpblk_t bb_first_free; /* first free block */ 2876 ext4_grpblk_t bb_free; /* total free blocks */ 2877 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 2878 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 2879 struct list_head bb_prealloc_list; 2880 #ifdef DOUBLE_CHECK 2881 void *bb_bitmap; 2882 #endif 2883 struct rw_semaphore alloc_sem; 2884 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2885 * regions, index is order. 2886 * bb_counters[3] = 5 means 2887 * 5 free 8-block regions. */ 2888 }; 2889 2890 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 2891 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 2892 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 2893 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 2894 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \ 2895 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT) 2896 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \ 2897 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT) 2898 2899 #define EXT4_MB_GRP_NEED_INIT(grp) \ 2900 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 2901 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 2902 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2903 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 2904 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2905 2906 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 2907 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2908 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 2909 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2910 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 2911 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2912 2913 #define EXT4_MAX_CONTENTION 8 2914 #define EXT4_CONTENTION_THRESHOLD 2 2915 2916 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2917 ext4_group_t group) 2918 { 2919 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2920 } 2921 2922 /* 2923 * Returns true if the filesystem is busy enough that attempts to 2924 * access the block group locks has run into contention. 2925 */ 2926 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 2927 { 2928 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 2929 } 2930 2931 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 2932 { 2933 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 2934 if (spin_trylock(lock)) 2935 /* 2936 * We're able to grab the lock right away, so drop the 2937 * lock contention counter. 2938 */ 2939 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 2940 else { 2941 /* 2942 * The lock is busy, so bump the contention counter, 2943 * and then wait on the spin lock. 2944 */ 2945 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 2946 EXT4_MAX_CONTENTION); 2947 spin_lock(lock); 2948 } 2949 } 2950 2951 static inline void ext4_unlock_group(struct super_block *sb, 2952 ext4_group_t group) 2953 { 2954 spin_unlock(ext4_group_lock_ptr(sb, group)); 2955 } 2956 2957 /* 2958 * Block validity checking 2959 */ 2960 #define ext4_check_indirect_blockref(inode, bh) \ 2961 ext4_check_blockref(__func__, __LINE__, inode, \ 2962 (__le32 *)(bh)->b_data, \ 2963 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 2964 2965 #define ext4_ind_check_inode(inode) \ 2966 ext4_check_blockref(__func__, __LINE__, inode, \ 2967 EXT4_I(inode)->i_data, \ 2968 EXT4_NDIR_BLOCKS) 2969 2970 /* 2971 * Inodes and files operations 2972 */ 2973 2974 /* dir.c */ 2975 extern const struct file_operations ext4_dir_operations; 2976 2977 /* file.c */ 2978 extern const struct inode_operations ext4_file_inode_operations; 2979 extern const struct file_operations ext4_file_operations; 2980 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 2981 2982 /* inline.c */ 2983 extern int ext4_get_max_inline_size(struct inode *inode); 2984 extern int ext4_find_inline_data_nolock(struct inode *inode); 2985 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 2986 unsigned int len); 2987 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 2988 2989 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 2990 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 2991 struct inode *inode, 2992 loff_t pos, unsigned len, 2993 unsigned flags, 2994 struct page **pagep); 2995 extern int ext4_write_inline_data_end(struct inode *inode, 2996 loff_t pos, unsigned len, 2997 unsigned copied, 2998 struct page *page); 2999 extern struct buffer_head * 3000 ext4_journalled_write_inline_data(struct inode *inode, 3001 unsigned len, 3002 struct page *page); 3003 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 3004 struct inode *inode, 3005 loff_t pos, unsigned len, 3006 unsigned flags, 3007 struct page **pagep, 3008 void **fsdata); 3009 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 3010 unsigned len, unsigned copied, 3011 struct page *page); 3012 extern int ext4_try_add_inline_entry(handle_t *handle, 3013 struct ext4_filename *fname, 3014 struct inode *dir, struct inode *inode); 3015 extern int ext4_try_create_inline_dir(handle_t *handle, 3016 struct inode *parent, 3017 struct inode *inode); 3018 extern int ext4_read_inline_dir(struct file *filp, 3019 struct dir_context *ctx, 3020 int *has_inline_data); 3021 extern int htree_inlinedir_to_tree(struct file *dir_file, 3022 struct inode *dir, ext4_lblk_t block, 3023 struct dx_hash_info *hinfo, 3024 __u32 start_hash, __u32 start_minor_hash, 3025 int *has_inline_data); 3026 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3027 struct ext4_filename *fname, 3028 struct ext4_dir_entry_2 **res_dir, 3029 int *has_inline_data); 3030 extern int ext4_delete_inline_entry(handle_t *handle, 3031 struct inode *dir, 3032 struct ext4_dir_entry_2 *de_del, 3033 struct buffer_head *bh, 3034 int *has_inline_data); 3035 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); 3036 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3037 struct ext4_dir_entry_2 **parent_de, 3038 int *retval); 3039 extern int ext4_inline_data_fiemap(struct inode *inode, 3040 struct fiemap_extent_info *fieinfo, 3041 int *has_inline, __u64 start, __u64 len); 3042 3043 struct iomap; 3044 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap); 3045 3046 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3047 3048 extern int ext4_convert_inline_data(struct inode *inode); 3049 3050 static inline int ext4_has_inline_data(struct inode *inode) 3051 { 3052 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3053 EXT4_I(inode)->i_inline_off; 3054 } 3055 3056 /* namei.c */ 3057 extern const struct inode_operations ext4_dir_inode_operations; 3058 extern const struct inode_operations ext4_special_inode_operations; 3059 extern struct dentry *ext4_get_parent(struct dentry *child); 3060 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3061 struct ext4_dir_entry_2 *de, 3062 int blocksize, int csum_size, 3063 unsigned int parent_ino, int dotdot_real_len); 3064 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t, 3065 unsigned int blocksize); 3066 extern int ext4_handle_dirty_dirent_node(handle_t *handle, 3067 struct inode *inode, 3068 struct buffer_head *bh); 3069 #define S_SHIFT 12 3070 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = { 3071 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3072 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3073 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3074 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3075 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3076 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3077 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3078 }; 3079 3080 static inline void ext4_set_de_type(struct super_block *sb, 3081 struct ext4_dir_entry_2 *de, 3082 umode_t mode) { 3083 if (ext4_has_feature_filetype(sb)) 3084 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3085 } 3086 3087 /* readpages.c */ 3088 extern int ext4_mpage_readpages(struct address_space *mapping, 3089 struct list_head *pages, struct page *page, 3090 unsigned nr_pages, bool is_readahead); 3091 3092 /* symlink.c */ 3093 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3094 extern const struct inode_operations ext4_symlink_inode_operations; 3095 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3096 3097 /* sysfs.c */ 3098 extern int ext4_register_sysfs(struct super_block *sb); 3099 extern void ext4_unregister_sysfs(struct super_block *sb); 3100 extern int __init ext4_init_sysfs(void); 3101 extern void ext4_exit_sysfs(void); 3102 3103 /* block_validity */ 3104 extern void ext4_release_system_zone(struct super_block *sb); 3105 extern int ext4_setup_system_zone(struct super_block *sb); 3106 extern int __init ext4_init_system_zone(void); 3107 extern void ext4_exit_system_zone(void); 3108 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 3109 ext4_fsblk_t start_blk, 3110 unsigned int count); 3111 extern int ext4_check_blockref(const char *, unsigned int, 3112 struct inode *, __le32 *, unsigned int); 3113 3114 /* extents.c */ 3115 struct ext4_ext_path; 3116 struct ext4_extent; 3117 3118 /* 3119 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3120 * __le32. 3121 */ 3122 #define EXT_MAX_BLOCKS 0xffffffff 3123 3124 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 3125 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 3126 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3127 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3128 struct ext4_map_blocks *map, int flags); 3129 extern int ext4_ext_truncate(handle_t *, struct inode *); 3130 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3131 ext4_lblk_t end); 3132 extern void ext4_ext_init(struct super_block *); 3133 extern void ext4_ext_release(struct super_block *); 3134 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3135 loff_t len); 3136 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3137 loff_t offset, ssize_t len); 3138 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3139 struct ext4_map_blocks *map, int flags); 3140 extern int ext4_ext_calc_metadata_amount(struct inode *inode, 3141 ext4_lblk_t lblocks); 3142 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3143 int num, 3144 struct ext4_ext_path *path); 3145 extern int ext4_can_extents_be_merged(struct inode *inode, 3146 struct ext4_extent *ex1, 3147 struct ext4_extent *ex2); 3148 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3149 struct ext4_ext_path **, 3150 struct ext4_extent *, int); 3151 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3152 struct ext4_ext_path **, 3153 int flags); 3154 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 3155 extern int ext4_ext_check_inode(struct inode *inode); 3156 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3157 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3158 __u64 start, __u64 len); 3159 extern int ext4_ext_precache(struct inode *inode); 3160 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len); 3161 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len); 3162 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3163 struct inode *inode2, ext4_lblk_t lblk1, 3164 ext4_lblk_t lblk2, ext4_lblk_t count, 3165 int mark_unwritten,int *err); 3166 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu); 3167 3168 /* move_extent.c */ 3169 extern void ext4_double_down_write_data_sem(struct inode *first, 3170 struct inode *second); 3171 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3172 struct inode *donor_inode); 3173 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3174 __u64 start_orig, __u64 start_donor, 3175 __u64 len, __u64 *moved_len); 3176 3177 /* page-io.c */ 3178 extern int __init ext4_init_pageio(void); 3179 extern void ext4_exit_pageio(void); 3180 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3181 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3182 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3183 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3184 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3185 struct writeback_control *wbc); 3186 extern void ext4_end_io_rsv_work(struct work_struct *work); 3187 extern void ext4_io_submit(struct ext4_io_submit *io); 3188 extern int ext4_bio_write_page(struct ext4_io_submit *io, 3189 struct page *page, 3190 int len, 3191 struct writeback_control *wbc, 3192 bool keep_towrite); 3193 3194 /* mmp.c */ 3195 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3196 3197 /* 3198 * Add new method to test whether block and inode bitmaps are properly 3199 * initialized. With uninit_bg reading the block from disk is not enough 3200 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3201 */ 3202 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3203 3204 static inline int bitmap_uptodate(struct buffer_head *bh) 3205 { 3206 return (buffer_uptodate(bh) && 3207 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3208 } 3209 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3210 { 3211 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3212 } 3213 3214 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3215 3216 /* For ioend & aio unwritten conversion wait queues */ 3217 #define EXT4_WQ_HASH_SZ 37 3218 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3219 EXT4_WQ_HASH_SZ]) 3220 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3221 3222 extern int ext4_resize_begin(struct super_block *sb); 3223 extern void ext4_resize_end(struct super_block *sb); 3224 3225 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 3226 struct ext4_io_end *io_end) 3227 { 3228 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 3229 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3230 atomic_inc(&EXT4_I(inode)->i_unwritten); 3231 } 3232 } 3233 3234 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3235 { 3236 struct inode *inode = io_end->inode; 3237 3238 if (io_end->flag & EXT4_IO_END_UNWRITTEN) { 3239 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3240 /* Wake up anyone waiting on unwritten extent conversion */ 3241 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) 3242 wake_up_all(ext4_ioend_wq(inode)); 3243 } 3244 } 3245 3246 extern const struct iomap_ops ext4_iomap_ops; 3247 3248 #endif /* __KERNEL__ */ 3249 3250 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3251 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3252 3253 #endif /* _EXT4_H */ 3254