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_CASEFOLD_FL 0x40000000 /* Casefolded file */ 403 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 404 405 #define EXT4_FL_USER_VISIBLE 0x704BDFFF /* User visible flags */ 406 #define EXT4_FL_USER_MODIFIABLE 0x604BC0FF /* User modifiable flags */ 407 408 /* Flags we can manipulate with through EXT4_IOC_FSSETXATTR */ 409 #define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \ 410 EXT4_IMMUTABLE_FL | \ 411 EXT4_APPEND_FL | \ 412 EXT4_NODUMP_FL | \ 413 EXT4_NOATIME_FL | \ 414 EXT4_PROJINHERIT_FL) 415 416 /* Flags that should be inherited by new inodes from their parent. */ 417 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 418 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 419 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 420 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 421 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL) 422 423 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 424 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL)) 425 426 /* Flags that are appropriate for non-directories/regular files. */ 427 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 428 429 /* The only flags that should be swapped */ 430 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL) 431 432 /* Mask out flags that are inappropriate for the given type of inode. */ 433 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 434 { 435 if (S_ISDIR(mode)) 436 return flags; 437 else if (S_ISREG(mode)) 438 return flags & EXT4_REG_FLMASK; 439 else 440 return flags & EXT4_OTHER_FLMASK; 441 } 442 443 /* 444 * Inode flags used for atomic set/get 445 */ 446 enum { 447 EXT4_INODE_SECRM = 0, /* Secure deletion */ 448 EXT4_INODE_UNRM = 1, /* Undelete */ 449 EXT4_INODE_COMPR = 2, /* Compress file */ 450 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 451 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 452 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 453 EXT4_INODE_NODUMP = 6, /* do not dump file */ 454 EXT4_INODE_NOATIME = 7, /* do not update atime */ 455 /* Reserved for compression usage... */ 456 EXT4_INODE_DIRTY = 8, 457 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 458 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 459 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 460 /* End compression flags --- maybe not all used */ 461 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 462 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 463 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 464 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 465 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 466 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 467 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 468 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 469 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 470 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 471 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 472 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 473 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 474 }; 475 476 /* 477 * Since it's pretty easy to mix up bit numbers and hex values, we use a 478 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 479 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 480 * any extra space in the compiled kernel image, otherwise, the build will fail. 481 * It's important that these values are the same, since we are using 482 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 483 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 484 * values found in ext2, ext3 and ext4 filesystems, and of course the values 485 * defined in e2fsprogs. 486 * 487 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 488 */ 489 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 490 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 491 492 static inline void ext4_check_flag_values(void) 493 { 494 CHECK_FLAG_VALUE(SECRM); 495 CHECK_FLAG_VALUE(UNRM); 496 CHECK_FLAG_VALUE(COMPR); 497 CHECK_FLAG_VALUE(SYNC); 498 CHECK_FLAG_VALUE(IMMUTABLE); 499 CHECK_FLAG_VALUE(APPEND); 500 CHECK_FLAG_VALUE(NODUMP); 501 CHECK_FLAG_VALUE(NOATIME); 502 CHECK_FLAG_VALUE(DIRTY); 503 CHECK_FLAG_VALUE(COMPRBLK); 504 CHECK_FLAG_VALUE(NOCOMPR); 505 CHECK_FLAG_VALUE(ENCRYPT); 506 CHECK_FLAG_VALUE(INDEX); 507 CHECK_FLAG_VALUE(IMAGIC); 508 CHECK_FLAG_VALUE(JOURNAL_DATA); 509 CHECK_FLAG_VALUE(NOTAIL); 510 CHECK_FLAG_VALUE(DIRSYNC); 511 CHECK_FLAG_VALUE(TOPDIR); 512 CHECK_FLAG_VALUE(HUGE_FILE); 513 CHECK_FLAG_VALUE(EXTENTS); 514 CHECK_FLAG_VALUE(EA_INODE); 515 CHECK_FLAG_VALUE(EOFBLOCKS); 516 CHECK_FLAG_VALUE(INLINE_DATA); 517 CHECK_FLAG_VALUE(PROJINHERIT); 518 CHECK_FLAG_VALUE(RESERVED); 519 } 520 521 /* Used to pass group descriptor data when online resize is done */ 522 struct ext4_new_group_input { 523 __u32 group; /* Group number for this data */ 524 __u64 block_bitmap; /* Absolute block number of block bitmap */ 525 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 526 __u64 inode_table; /* Absolute block number of inode table start */ 527 __u32 blocks_count; /* Total number of blocks in this group */ 528 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 529 __u16 unused; 530 }; 531 532 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 533 struct compat_ext4_new_group_input { 534 u32 group; 535 compat_u64 block_bitmap; 536 compat_u64 inode_bitmap; 537 compat_u64 inode_table; 538 u32 blocks_count; 539 u16 reserved_blocks; 540 u16 unused; 541 }; 542 #endif 543 544 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 545 struct ext4_new_group_data { 546 __u32 group; 547 __u64 block_bitmap; 548 __u64 inode_bitmap; 549 __u64 inode_table; 550 __u32 blocks_count; 551 __u16 reserved_blocks; 552 __u16 mdata_blocks; 553 __u32 free_clusters_count; 554 }; 555 556 /* Indexes used to index group tables in ext4_new_group_data */ 557 enum { 558 BLOCK_BITMAP = 0, /* block bitmap */ 559 INODE_BITMAP, /* inode bitmap */ 560 INODE_TABLE, /* inode tables */ 561 GROUP_TABLE_COUNT, 562 }; 563 564 /* 565 * Flags used by ext4_map_blocks() 566 */ 567 /* Allocate any needed blocks and/or convert an unwritten 568 extent to be an initialized ext4 */ 569 #define EXT4_GET_BLOCKS_CREATE 0x0001 570 /* Request the creation of an unwritten extent */ 571 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 572 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 573 EXT4_GET_BLOCKS_CREATE) 574 /* Caller is from the delayed allocation writeout path 575 * finally doing the actual allocation of delayed blocks */ 576 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 577 /* caller is from the direct IO path, request to creation of an 578 unwritten extents if not allocated, split the unwritten 579 extent if blocks has been preallocated already*/ 580 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 581 #define EXT4_GET_BLOCKS_CONVERT 0x0010 582 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 583 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 584 /* Convert extent to initialized after IO complete */ 585 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 586 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 587 /* Eventual metadata allocation (due to growing extent tree) 588 * should not fail, so try to use reserved blocks for that.*/ 589 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 590 /* Don't normalize allocation size (used for fallocate) */ 591 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 592 /* Request will not result in inode size update (user for fallocate) */ 593 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 594 /* Convert written extents to unwritten */ 595 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 596 /* Write zeros to newly created written extents */ 597 #define EXT4_GET_BLOCKS_ZERO 0x0200 598 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 599 EXT4_GET_BLOCKS_ZERO) 600 /* Caller will submit data before dropping transaction handle. This 601 * allows jbd2 to avoid submitting data before commit. */ 602 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 603 604 /* 605 * The bit position of these flags must not overlap with any of the 606 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 607 * read_extent_tree_block(), ext4_split_extent_at(), 608 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 609 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 610 * caching the extents when reading from the extent tree while a 611 * truncate or punch hole operation is in progress. 612 */ 613 #define EXT4_EX_NOCACHE 0x40000000 614 #define EXT4_EX_FORCE_CACHE 0x20000000 615 616 /* 617 * Flags used by ext4_free_blocks 618 */ 619 #define EXT4_FREE_BLOCKS_METADATA 0x0001 620 #define EXT4_FREE_BLOCKS_FORGET 0x0002 621 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 622 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 623 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 624 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 625 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040 626 627 /* 628 * ioctl commands 629 */ 630 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 631 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 632 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 633 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 634 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 635 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 636 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 637 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 638 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 639 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 640 #define EXT4_IOC_MIGRATE _IO('f', 9) 641 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 642 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 643 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 644 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 645 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 646 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 647 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 648 #define EXT4_IOC_SET_ENCRYPTION_POLICY FS_IOC_SET_ENCRYPTION_POLICY 649 #define EXT4_IOC_GET_ENCRYPTION_PWSALT FS_IOC_GET_ENCRYPTION_PWSALT 650 #define EXT4_IOC_GET_ENCRYPTION_POLICY FS_IOC_GET_ENCRYPTION_POLICY 651 652 #define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR 653 #define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR 654 655 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32) 656 657 /* 658 * Flags for going down operation 659 */ 660 #define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */ 661 #define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */ 662 #define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */ 663 664 665 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 666 /* 667 * ioctl commands in 32 bit emulation 668 */ 669 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 670 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 671 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 672 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 673 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 674 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 675 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 676 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 677 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 678 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 679 #endif 680 681 /* Max physical block we can address w/o extents */ 682 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 683 684 /* Max logical block we can support */ 685 #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFF 686 687 /* 688 * Structure of an inode on the disk 689 */ 690 struct ext4_inode { 691 __le16 i_mode; /* File mode */ 692 __le16 i_uid; /* Low 16 bits of Owner Uid */ 693 __le32 i_size_lo; /* Size in bytes */ 694 __le32 i_atime; /* Access time */ 695 __le32 i_ctime; /* Inode Change time */ 696 __le32 i_mtime; /* Modification time */ 697 __le32 i_dtime; /* Deletion Time */ 698 __le16 i_gid; /* Low 16 bits of Group Id */ 699 __le16 i_links_count; /* Links count */ 700 __le32 i_blocks_lo; /* Blocks count */ 701 __le32 i_flags; /* File flags */ 702 union { 703 struct { 704 __le32 l_i_version; 705 } linux1; 706 struct { 707 __u32 h_i_translator; 708 } hurd1; 709 struct { 710 __u32 m_i_reserved1; 711 } masix1; 712 } osd1; /* OS dependent 1 */ 713 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 714 __le32 i_generation; /* File version (for NFS) */ 715 __le32 i_file_acl_lo; /* File ACL */ 716 __le32 i_size_high; 717 __le32 i_obso_faddr; /* Obsoleted fragment address */ 718 union { 719 struct { 720 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 721 __le16 l_i_file_acl_high; 722 __le16 l_i_uid_high; /* these 2 fields */ 723 __le16 l_i_gid_high; /* were reserved2[0] */ 724 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 725 __le16 l_i_reserved; 726 } linux2; 727 struct { 728 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 729 __u16 h_i_mode_high; 730 __u16 h_i_uid_high; 731 __u16 h_i_gid_high; 732 __u32 h_i_author; 733 } hurd2; 734 struct { 735 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 736 __le16 m_i_file_acl_high; 737 __u32 m_i_reserved2[2]; 738 } masix2; 739 } osd2; /* OS dependent 2 */ 740 __le16 i_extra_isize; 741 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 742 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 743 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 744 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 745 __le32 i_crtime; /* File Creation time */ 746 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 747 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 748 __le32 i_projid; /* Project ID */ 749 }; 750 751 struct move_extent { 752 __u32 reserved; /* should be zero */ 753 __u32 donor_fd; /* donor file descriptor */ 754 __u64 orig_start; /* logical start offset in block for orig */ 755 __u64 donor_start; /* logical start offset in block for donor */ 756 __u64 len; /* block length to be moved */ 757 __u64 moved_len; /* moved block length */ 758 }; 759 760 #define EXT4_EPOCH_BITS 2 761 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 762 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 763 764 /* 765 * Extended fields will fit into an inode if the filesystem was formatted 766 * with large inodes (-I 256 or larger) and there are not currently any EAs 767 * consuming all of the available space. For new inodes we always reserve 768 * enough space for the kernel's known extended fields, but for inodes 769 * created with an old kernel this might not have been the case. None of 770 * the extended inode fields is critical for correct filesystem operation. 771 * This macro checks if a certain field fits in the inode. Note that 772 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 773 */ 774 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 775 ((offsetof(typeof(*ext4_inode), field) + \ 776 sizeof((ext4_inode)->field)) \ 777 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 778 (einode)->i_extra_isize)) \ 779 780 /* 781 * We use an encoding that preserves the times for extra epoch "00": 782 * 783 * extra msb of adjust for signed 784 * epoch 32-bit 32-bit tv_sec to 785 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 786 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 787 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 788 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 789 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 790 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 791 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 792 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 793 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 794 * 795 * Note that previous versions of the kernel on 64-bit systems would 796 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 797 * 1970. e2fsck will correct this, assuming that it is run on the 798 * affected filesystem before 2242. 799 */ 800 801 static inline __le32 ext4_encode_extra_time(struct timespec64 *time) 802 { 803 u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK; 804 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); 805 } 806 807 static inline void ext4_decode_extra_time(struct timespec64 *time, 808 __le32 extra) 809 { 810 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) { 811 812 #if 1 813 /* Handle legacy encoding of pre-1970 dates with epoch 814 * bits 1,1. (This backwards compatibility may be removed 815 * at the discretion of the ext4 developers.) 816 */ 817 u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK; 818 if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0) 819 extra_bits = 0; 820 time->tv_sec += extra_bits << 32; 821 #else 822 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 823 #endif 824 } 825 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 826 } 827 828 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 829 do { \ 830 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 831 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\ 832 (raw_inode)->xtime ## _extra = \ 833 ext4_encode_extra_time(&(inode)->xtime); \ 834 } \ 835 } while (0) 836 837 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 838 do { \ 839 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 840 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 841 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 842 (raw_inode)->xtime ## _extra = \ 843 ext4_encode_extra_time(&(einode)->xtime); \ 844 } while (0) 845 846 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 847 do { \ 848 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 849 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \ 850 ext4_decode_extra_time(&(inode)->xtime, \ 851 raw_inode->xtime ## _extra); \ 852 } \ 853 else \ 854 (inode)->xtime.tv_nsec = 0; \ 855 } while (0) 856 857 858 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 859 do { \ 860 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 861 (einode)->xtime.tv_sec = \ 862 (signed)le32_to_cpu((raw_inode)->xtime); \ 863 else \ 864 (einode)->xtime.tv_sec = 0; \ 865 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 866 ext4_decode_extra_time(&(einode)->xtime, \ 867 raw_inode->xtime ## _extra); \ 868 else \ 869 (einode)->xtime.tv_nsec = 0; \ 870 } while (0) 871 872 #define i_disk_version osd1.linux1.l_i_version 873 874 #if defined(__KERNEL__) || defined(__linux__) 875 #define i_reserved1 osd1.linux1.l_i_reserved1 876 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 877 #define i_blocks_high osd2.linux2.l_i_blocks_high 878 #define i_uid_low i_uid 879 #define i_gid_low i_gid 880 #define i_uid_high osd2.linux2.l_i_uid_high 881 #define i_gid_high osd2.linux2.l_i_gid_high 882 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 883 884 #elif defined(__GNU__) 885 886 #define i_translator osd1.hurd1.h_i_translator 887 #define i_uid_high osd2.hurd2.h_i_uid_high 888 #define i_gid_high osd2.hurd2.h_i_gid_high 889 #define i_author osd2.hurd2.h_i_author 890 891 #elif defined(__masix__) 892 893 #define i_reserved1 osd1.masix1.m_i_reserved1 894 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 895 #define i_reserved2 osd2.masix2.m_i_reserved2 896 897 #endif /* defined(__KERNEL__) || defined(__linux__) */ 898 899 #include "extents_status.h" 900 901 /* 902 * Lock subclasses for i_data_sem in the ext4_inode_info structure. 903 * 904 * These are needed to avoid lockdep false positives when we need to 905 * allocate blocks to the quota inode during ext4_map_blocks(), while 906 * holding i_data_sem for a normal (non-quota) inode. Since we don't 907 * do quota tracking for the quota inode, this avoids deadlock (as 908 * well as infinite recursion, since it isn't turtles all the way 909 * down...) 910 * 911 * I_DATA_SEM_NORMAL - Used for most inodes 912 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode 913 * where the second inode has larger inode number 914 * than the first 915 * I_DATA_SEM_QUOTA - Used for quota inodes only 916 */ 917 enum { 918 I_DATA_SEM_NORMAL = 0, 919 I_DATA_SEM_OTHER, 920 I_DATA_SEM_QUOTA, 921 }; 922 923 924 /* 925 * fourth extended file system inode data in memory 926 */ 927 struct ext4_inode_info { 928 __le32 i_data[15]; /* unconverted */ 929 __u32 i_dtime; 930 ext4_fsblk_t i_file_acl; 931 932 /* 933 * i_block_group is the number of the block group which contains 934 * this file's inode. Constant across the lifetime of the inode, 935 * it is used for making block allocation decisions - we try to 936 * place a file's data blocks near its inode block, and new inodes 937 * near to their parent directory's inode. 938 */ 939 ext4_group_t i_block_group; 940 ext4_lblk_t i_dir_start_lookup; 941 #if (BITS_PER_LONG < 64) 942 unsigned long i_state_flags; /* Dynamic state flags */ 943 #endif 944 unsigned long i_flags; 945 946 /* 947 * Extended attributes can be read independently of the main file 948 * data. Taking i_mutex even when reading would cause contention 949 * between readers of EAs and writers of regular file data, so 950 * instead we synchronize on xattr_sem when reading or changing 951 * EAs. 952 */ 953 struct rw_semaphore xattr_sem; 954 955 struct list_head i_orphan; /* unlinked but open inodes */ 956 957 /* 958 * i_disksize keeps track of what the inode size is ON DISK, not 959 * in memory. During truncate, i_size is set to the new size by 960 * the VFS prior to calling ext4_truncate(), but the filesystem won't 961 * set i_disksize to 0 until the truncate is actually under way. 962 * 963 * The intent is that i_disksize always represents the blocks which 964 * are used by this file. This allows recovery to restart truncate 965 * on orphans if we crash during truncate. We actually write i_disksize 966 * into the on-disk inode when writing inodes out, instead of i_size. 967 * 968 * The only time when i_disksize and i_size may be different is when 969 * a truncate is in progress. The only things which change i_disksize 970 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 971 */ 972 loff_t i_disksize; 973 974 /* 975 * i_data_sem is for serialising ext4_truncate() against 976 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 977 * data tree are chopped off during truncate. We can't do that in 978 * ext4 because whenever we perform intermediate commits during 979 * truncate, the inode and all the metadata blocks *must* be in a 980 * consistent state which allows truncation of the orphans to restart 981 * during recovery. Hence we must fix the get_block-vs-truncate race 982 * by other means, so we have i_data_sem. 983 */ 984 struct rw_semaphore i_data_sem; 985 /* 986 * i_mmap_sem is for serializing page faults with truncate / punch hole 987 * operations. We have to make sure that new page cannot be faulted in 988 * a section of the inode that is being punched. We cannot easily use 989 * i_data_sem for this since we need protection for the whole punch 990 * operation and i_data_sem ranks below transaction start so we have 991 * to occasionally drop it. 992 */ 993 struct rw_semaphore i_mmap_sem; 994 struct inode vfs_inode; 995 struct jbd2_inode *jinode; 996 997 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 998 999 /* 1000 * File creation time. Its function is same as that of 1001 * struct timespec64 i_{a,c,m}time in the generic inode. 1002 */ 1003 struct timespec64 i_crtime; 1004 1005 /* mballoc */ 1006 struct list_head i_prealloc_list; 1007 spinlock_t i_prealloc_lock; 1008 1009 /* extents status tree */ 1010 struct ext4_es_tree i_es_tree; 1011 rwlock_t i_es_lock; 1012 struct list_head i_es_list; 1013 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1014 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1015 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1016 extents to shrink. Protected by 1017 i_es_lock */ 1018 1019 /* ialloc */ 1020 ext4_group_t i_last_alloc_group; 1021 1022 /* allocation reservation info for delalloc */ 1023 /* In case of bigalloc, this refer to clusters rather than blocks */ 1024 unsigned int i_reserved_data_blocks; 1025 ext4_lblk_t i_da_metadata_calc_last_lblock; 1026 int i_da_metadata_calc_len; 1027 1028 /* pending cluster reservations for bigalloc file systems */ 1029 struct ext4_pending_tree i_pending_tree; 1030 1031 /* on-disk additional length */ 1032 __u16 i_extra_isize; 1033 1034 /* Indicate the inline data space. */ 1035 u16 i_inline_off; 1036 u16 i_inline_size; 1037 1038 #ifdef CONFIG_QUOTA 1039 /* quota space reservation, managed internally by quota code */ 1040 qsize_t i_reserved_quota; 1041 #endif 1042 1043 /* Lock protecting lists below */ 1044 spinlock_t i_completed_io_lock; 1045 /* 1046 * Completed IOs that need unwritten extents handling and have 1047 * transaction reserved 1048 */ 1049 struct list_head i_rsv_conversion_list; 1050 struct work_struct i_rsv_conversion_work; 1051 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 1052 1053 spinlock_t i_block_reservation_lock; 1054 1055 /* 1056 * Transactions that contain inode's metadata needed to complete 1057 * fsync and fdatasync, respectively. 1058 */ 1059 tid_t i_sync_tid; 1060 tid_t i_datasync_tid; 1061 1062 #ifdef CONFIG_QUOTA 1063 struct dquot *i_dquot[MAXQUOTAS]; 1064 #endif 1065 1066 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1067 __u32 i_csum_seed; 1068 1069 kprojid_t i_projid; 1070 }; 1071 1072 /* 1073 * File system states 1074 */ 1075 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1076 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1077 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1078 1079 /* 1080 * Misc. filesystem flags 1081 */ 1082 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1083 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1084 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1085 1086 /* 1087 * Mount flags set via mount options or defaults 1088 */ 1089 #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */ 1090 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1091 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1092 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1093 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1094 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1095 #define EXT4_MOUNT_ERRORS_MASK 0x00070 1096 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1097 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1098 #ifdef CONFIG_FS_DAX 1099 #define EXT4_MOUNT_DAX 0x00200 /* Direct Access */ 1100 #else 1101 #define EXT4_MOUNT_DAX 0 1102 #endif 1103 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1104 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1105 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1106 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1107 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1108 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1109 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1110 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1111 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1112 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1113 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */ 1114 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota, 1115 * enable enforcement for hidden 1116 * quota files */ 1117 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable 1118 * enforcement for hidden quota 1119 * files */ 1120 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota 1121 * enforcement */ 1122 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1123 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1124 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1125 #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */ 1126 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1127 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1128 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1129 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1130 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1131 1132 /* 1133 * Mount flags set either automatically (could not be set by mount option) 1134 * based on per file system feature or property or in special cases such as 1135 * distinguishing between explicit mount option definition and default. 1136 */ 1137 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1138 specified delalloc */ 1139 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1140 size of blocksize * 8 1141 blocks */ 1142 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1143 file systems */ 1144 1145 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1146 specified journal checksum */ 1147 1148 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1149 ~EXT4_MOUNT_##opt 1150 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1151 EXT4_MOUNT_##opt 1152 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1153 EXT4_MOUNT_##opt) 1154 1155 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1156 ~EXT4_MOUNT2_##opt 1157 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1158 EXT4_MOUNT2_##opt 1159 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1160 EXT4_MOUNT2_##opt) 1161 1162 #define ext4_test_and_set_bit __test_and_set_bit_le 1163 #define ext4_set_bit __set_bit_le 1164 #define ext4_set_bit_atomic ext2_set_bit_atomic 1165 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1166 #define ext4_clear_bit __clear_bit_le 1167 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1168 #define ext4_test_bit test_bit_le 1169 #define ext4_find_next_zero_bit find_next_zero_bit_le 1170 #define ext4_find_next_bit find_next_bit_le 1171 1172 extern void ext4_set_bits(void *bm, int cur, int len); 1173 1174 /* 1175 * Maximal mount counts between two filesystem checks 1176 */ 1177 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1178 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1179 1180 /* 1181 * Behaviour when detecting errors 1182 */ 1183 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1184 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1185 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1186 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1187 1188 /* Metadata checksum algorithm codes */ 1189 #define EXT4_CRC32C_CHKSUM 1 1190 1191 /* 1192 * Structure of the super block 1193 */ 1194 struct ext4_super_block { 1195 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1196 __le32 s_blocks_count_lo; /* Blocks count */ 1197 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1198 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1199 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1200 __le32 s_first_data_block; /* First Data Block */ 1201 __le32 s_log_block_size; /* Block size */ 1202 __le32 s_log_cluster_size; /* Allocation cluster size */ 1203 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1204 __le32 s_clusters_per_group; /* # Clusters per group */ 1205 __le32 s_inodes_per_group; /* # Inodes per group */ 1206 __le32 s_mtime; /* Mount time */ 1207 /*30*/ __le32 s_wtime; /* Write time */ 1208 __le16 s_mnt_count; /* Mount count */ 1209 __le16 s_max_mnt_count; /* Maximal mount count */ 1210 __le16 s_magic; /* Magic signature */ 1211 __le16 s_state; /* File system state */ 1212 __le16 s_errors; /* Behaviour when detecting errors */ 1213 __le16 s_minor_rev_level; /* minor revision level */ 1214 /*40*/ __le32 s_lastcheck; /* time of last check */ 1215 __le32 s_checkinterval; /* max. time between checks */ 1216 __le32 s_creator_os; /* OS */ 1217 __le32 s_rev_level; /* Revision level */ 1218 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1219 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1220 /* 1221 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1222 * 1223 * Note: the difference between the compatible feature set and 1224 * the incompatible feature set is that if there is a bit set 1225 * in the incompatible feature set that the kernel doesn't 1226 * know about, it should refuse to mount the filesystem. 1227 * 1228 * e2fsck's requirements are more strict; if it doesn't know 1229 * about a feature in either the compatible or incompatible 1230 * feature set, it must abort and not try to meddle with 1231 * things it doesn't understand... 1232 */ 1233 __le32 s_first_ino; /* First non-reserved inode */ 1234 __le16 s_inode_size; /* size of inode structure */ 1235 __le16 s_block_group_nr; /* block group # of this superblock */ 1236 __le32 s_feature_compat; /* compatible feature set */ 1237 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1238 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1239 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1240 /*78*/ char s_volume_name[16]; /* volume name */ 1241 /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */ 1242 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1243 /* 1244 * Performance hints. Directory preallocation should only 1245 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1246 */ 1247 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1248 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1249 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1250 /* 1251 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1252 */ 1253 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1254 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1255 __le32 s_journal_dev; /* device number of journal file */ 1256 __le32 s_last_orphan; /* start of list of inodes to delete */ 1257 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1258 __u8 s_def_hash_version; /* Default hash version to use */ 1259 __u8 s_jnl_backup_type; 1260 __le16 s_desc_size; /* size of group descriptor */ 1261 /*100*/ __le32 s_default_mount_opts; 1262 __le32 s_first_meta_bg; /* First metablock block group */ 1263 __le32 s_mkfs_time; /* When the filesystem was created */ 1264 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1265 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1266 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1267 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1268 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1269 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1270 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1271 __le32 s_flags; /* Miscellaneous flags */ 1272 __le16 s_raid_stride; /* RAID stride */ 1273 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1274 __le64 s_mmp_block; /* Block for multi-mount protection */ 1275 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1276 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1277 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1278 __u8 s_encryption_level; /* versioning level for encryption */ 1279 __u8 s_reserved_pad; /* Padding to next 32bits */ 1280 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1281 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1282 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1283 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1284 snapshot's future use */ 1285 __le32 s_snapshot_list; /* inode number of the head of the 1286 on-disk snapshot list */ 1287 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1288 __le32 s_error_count; /* number of fs errors */ 1289 __le32 s_first_error_time; /* first time an error happened */ 1290 __le32 s_first_error_ino; /* inode involved in first error */ 1291 __le64 s_first_error_block; /* block involved of first error */ 1292 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */ 1293 __le32 s_first_error_line; /* line number where error happened */ 1294 __le32 s_last_error_time; /* most recent time of an error */ 1295 __le32 s_last_error_ino; /* inode involved in last error */ 1296 __le32 s_last_error_line; /* line number where error happened */ 1297 __le64 s_last_error_block; /* block involved of last error */ 1298 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */ 1299 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1300 __u8 s_mount_opts[64]; 1301 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1302 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1303 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1304 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1305 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1306 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1307 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1308 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1309 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1310 __u8 s_wtime_hi; 1311 __u8 s_mtime_hi; 1312 __u8 s_mkfs_time_hi; 1313 __u8 s_lastcheck_hi; 1314 __u8 s_first_error_time_hi; 1315 __u8 s_last_error_time_hi; 1316 __u8 s_pad[2]; 1317 __le16 s_encoding; /* Filename charset encoding */ 1318 __le16 s_encoding_flags; /* Filename charset encoding flags */ 1319 __le32 s_reserved[95]; /* Padding to the end of the block */ 1320 __le32 s_checksum; /* crc32c(superblock) */ 1321 }; 1322 1323 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1324 1325 #ifdef __KERNEL__ 1326 1327 /* 1328 * run-time mount flags 1329 */ 1330 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1331 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1332 #define EXT4_MF_TEST_DUMMY_ENCRYPTION 0x0004 1333 1334 #ifdef CONFIG_FS_ENCRYPTION 1335 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \ 1336 EXT4_MF_TEST_DUMMY_ENCRYPTION)) 1337 #else 1338 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0) 1339 #endif 1340 1341 /* Number of quota types we support */ 1342 #define EXT4_MAXQUOTAS 3 1343 1344 #define EXT4_ENC_UTF8_12_1 1 1345 1346 /* 1347 * Flags for ext4_sb_info.s_encoding_flags. 1348 */ 1349 #define EXT4_ENC_STRICT_MODE_FL (1 << 0) 1350 1351 #define ext4_has_strict_mode(sbi) \ 1352 (sbi->s_encoding_flags & EXT4_ENC_STRICT_MODE_FL) 1353 1354 /* 1355 * fourth extended-fs super-block data in memory 1356 */ 1357 struct ext4_sb_info { 1358 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1359 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1360 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1361 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1362 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1363 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1364 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1365 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1366 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1367 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1368 unsigned long s_overhead; /* # of fs overhead clusters */ 1369 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1370 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1371 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1372 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1373 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1374 struct buffer_head **s_group_desc; 1375 unsigned int s_mount_opt; 1376 unsigned int s_mount_opt2; 1377 unsigned int s_mount_flags; 1378 unsigned int s_def_mount_opt; 1379 ext4_fsblk_t s_sb_block; 1380 atomic64_t s_resv_clusters; 1381 kuid_t s_resuid; 1382 kgid_t s_resgid; 1383 unsigned short s_mount_state; 1384 unsigned short s_pad; 1385 int s_addr_per_block_bits; 1386 int s_desc_per_block_bits; 1387 int s_inode_size; 1388 int s_first_ino; 1389 unsigned int s_inode_readahead_blks; 1390 unsigned int s_inode_goal; 1391 u32 s_hash_seed[4]; 1392 int s_def_hash_version; 1393 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1394 struct percpu_counter s_freeclusters_counter; 1395 struct percpu_counter s_freeinodes_counter; 1396 struct percpu_counter s_dirs_counter; 1397 struct percpu_counter s_dirtyclusters_counter; 1398 struct blockgroup_lock *s_blockgroup_lock; 1399 struct proc_dir_entry *s_proc; 1400 struct kobject s_kobj; 1401 struct completion s_kobj_unregister; 1402 struct super_block *s_sb; 1403 #ifdef CONFIG_UNICODE 1404 struct unicode_map *s_encoding; 1405 __u16 s_encoding_flags; 1406 #endif 1407 1408 /* Journaling */ 1409 struct journal_s *s_journal; 1410 struct list_head s_orphan; 1411 struct mutex s_orphan_lock; 1412 unsigned long s_ext4_flags; /* Ext4 superblock flags */ 1413 unsigned long s_commit_interval; 1414 u32 s_max_batch_time; 1415 u32 s_min_batch_time; 1416 struct block_device *journal_bdev; 1417 #ifdef CONFIG_QUOTA 1418 /* Names of quota files with journalled quota */ 1419 char __rcu *s_qf_names[EXT4_MAXQUOTAS]; 1420 int s_jquota_fmt; /* Format of quota to use */ 1421 #endif 1422 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1423 struct rb_root system_blks; 1424 1425 #ifdef EXTENTS_STATS 1426 /* ext4 extents stats */ 1427 unsigned long s_ext_min; 1428 unsigned long s_ext_max; 1429 unsigned long s_depth_max; 1430 spinlock_t s_ext_stats_lock; 1431 unsigned long s_ext_blocks; 1432 unsigned long s_ext_extents; 1433 #endif 1434 1435 /* for buddy allocator */ 1436 struct ext4_group_info ***s_group_info; 1437 struct inode *s_buddy_cache; 1438 spinlock_t s_md_lock; 1439 unsigned short *s_mb_offsets; 1440 unsigned int *s_mb_maxs; 1441 unsigned int s_group_info_size; 1442 unsigned int s_mb_free_pending; 1443 struct list_head s_freed_data_list; /* List of blocks to be freed 1444 after commit completed */ 1445 1446 /* tunables */ 1447 unsigned long s_stripe; 1448 unsigned int s_mb_stream_request; 1449 unsigned int s_mb_max_to_scan; 1450 unsigned int s_mb_min_to_scan; 1451 unsigned int s_mb_stats; 1452 unsigned int s_mb_order2_reqs; 1453 unsigned int s_mb_group_prealloc; 1454 unsigned int s_max_dir_size_kb; 1455 /* where last allocation was done - for stream allocation */ 1456 unsigned long s_mb_last_group; 1457 unsigned long s_mb_last_start; 1458 1459 /* stats for buddy allocator */ 1460 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1461 atomic_t s_bal_success; /* we found long enough chunks */ 1462 atomic_t s_bal_allocated; /* in blocks */ 1463 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1464 atomic_t s_bal_goals; /* goal hits */ 1465 atomic_t s_bal_breaks; /* too long searches */ 1466 atomic_t s_bal_2orders; /* 2^order hits */ 1467 spinlock_t s_bal_lock; 1468 unsigned long s_mb_buddies_generated; 1469 unsigned long long s_mb_generation_time; 1470 atomic_t s_mb_lost_chunks; 1471 atomic_t s_mb_preallocated; 1472 atomic_t s_mb_discarded; 1473 atomic_t s_lock_busy; 1474 1475 /* locality groups */ 1476 struct ext4_locality_group __percpu *s_locality_groups; 1477 1478 /* for write statistics */ 1479 unsigned long s_sectors_written_start; 1480 u64 s_kbytes_written; 1481 1482 /* the size of zero-out chunk */ 1483 unsigned int s_extent_max_zeroout_kb; 1484 1485 unsigned int s_log_groups_per_flex; 1486 struct flex_groups *s_flex_groups; 1487 ext4_group_t s_flex_groups_allocated; 1488 1489 /* workqueue for reserved extent conversions (buffered io) */ 1490 struct workqueue_struct *rsv_conversion_wq; 1491 1492 /* timer for periodic error stats printing */ 1493 struct timer_list s_err_report; 1494 1495 /* Lazy inode table initialization info */ 1496 struct ext4_li_request *s_li_request; 1497 /* Wait multiplier for lazy initialization thread */ 1498 unsigned int s_li_wait_mult; 1499 1500 /* Kernel thread for multiple mount protection */ 1501 struct task_struct *s_mmp_tsk; 1502 1503 /* record the last minlen when FITRIM is called. */ 1504 atomic_t s_last_trim_minblks; 1505 1506 /* Reference to checksum algorithm driver via cryptoapi */ 1507 struct crypto_shash *s_chksum_driver; 1508 1509 /* Precomputed FS UUID checksum for seeding other checksums */ 1510 __u32 s_csum_seed; 1511 1512 /* Reclaim extents from extent status tree */ 1513 struct shrinker s_es_shrinker; 1514 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1515 long s_es_nr_inode; 1516 struct ext4_es_stats s_es_stats; 1517 struct mb_cache *s_ea_block_cache; 1518 struct mb_cache *s_ea_inode_cache; 1519 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1520 1521 /* Ratelimit ext4 messages. */ 1522 struct ratelimit_state s_err_ratelimit_state; 1523 struct ratelimit_state s_warning_ratelimit_state; 1524 struct ratelimit_state s_msg_ratelimit_state; 1525 1526 /* Barrier between changing inodes' journal flags and writepages ops. */ 1527 struct percpu_rw_semaphore s_journal_flag_rwsem; 1528 struct dax_device *s_daxdev; 1529 }; 1530 1531 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1532 { 1533 return sb->s_fs_info; 1534 } 1535 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1536 { 1537 return container_of(inode, struct ext4_inode_info, vfs_inode); 1538 } 1539 1540 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1541 { 1542 return ino == EXT4_ROOT_INO || 1543 (ino >= EXT4_FIRST_INO(sb) && 1544 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1545 } 1546 1547 /* 1548 * Inode dynamic state flags 1549 */ 1550 enum { 1551 EXT4_STATE_JDATA, /* journaled data exists */ 1552 EXT4_STATE_NEW, /* inode is newly created */ 1553 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1554 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1555 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1556 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1557 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1558 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1559 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1560 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1561 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */ 1562 }; 1563 1564 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1565 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1566 { \ 1567 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1568 } \ 1569 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1570 { \ 1571 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1572 } \ 1573 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1574 { \ 1575 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1576 } 1577 1578 /* Add these declarations here only so that these functions can be 1579 * found by name. Otherwise, they are very hard to locate. */ 1580 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1581 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1582 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1583 EXT4_INODE_BIT_FNS(flag, flags, 0) 1584 1585 /* Add these declarations here only so that these functions can be 1586 * found by name. Otherwise, they are very hard to locate. */ 1587 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1588 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1589 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1590 #if (BITS_PER_LONG < 64) 1591 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1592 1593 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1594 { 1595 (ei)->i_state_flags = 0; 1596 } 1597 #else 1598 EXT4_INODE_BIT_FNS(state, flags, 32) 1599 1600 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1601 { 1602 /* We depend on the fact that callers will set i_flags */ 1603 } 1604 #endif 1605 #else 1606 /* Assume that user mode programs are passing in an ext4fs superblock, not 1607 * a kernel struct super_block. This will allow us to call the feature-test 1608 * macros from user land. */ 1609 #define EXT4_SB(sb) (sb) 1610 #endif 1611 1612 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1613 1614 /* 1615 * Codes for operating systems 1616 */ 1617 #define EXT4_OS_LINUX 0 1618 #define EXT4_OS_HURD 1 1619 #define EXT4_OS_MASIX 2 1620 #define EXT4_OS_FREEBSD 3 1621 #define EXT4_OS_LITES 4 1622 1623 /* 1624 * Revision levels 1625 */ 1626 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1627 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1628 1629 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1630 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1631 1632 #define EXT4_GOOD_OLD_INODE_SIZE 128 1633 1634 /* 1635 * Feature set definitions 1636 */ 1637 1638 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1639 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1640 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1641 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1642 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1643 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1644 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1645 1646 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1647 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1648 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1649 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1650 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1651 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1652 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1653 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1654 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1655 /* 1656 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1657 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1658 * all other data structures' checksums. However, the METADATA_CSUM and 1659 * GDT_CSUM bits are mutually exclusive. 1660 */ 1661 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1662 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1663 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 1664 1665 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1666 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1667 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1668 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1669 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1670 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1671 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1672 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1673 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1674 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1675 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1676 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 1677 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1678 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1679 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1680 #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000 1681 1682 extern void ext4_update_dynamic_rev(struct super_block *sb); 1683 1684 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 1685 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1686 { \ 1687 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1688 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 1689 } \ 1690 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1691 { \ 1692 ext4_update_dynamic_rev(sb); \ 1693 EXT4_SB(sb)->s_es->s_feature_compat |= \ 1694 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1695 } \ 1696 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1697 { \ 1698 EXT4_SB(sb)->s_es->s_feature_compat &= \ 1699 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1700 } 1701 1702 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 1703 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1704 { \ 1705 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1706 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 1707 } \ 1708 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1709 { \ 1710 ext4_update_dynamic_rev(sb); \ 1711 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 1712 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1713 } \ 1714 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1715 { \ 1716 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 1717 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1718 } 1719 1720 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 1721 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1722 { \ 1723 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1724 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 1725 } \ 1726 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1727 { \ 1728 ext4_update_dynamic_rev(sb); \ 1729 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 1730 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1731 } \ 1732 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1733 { \ 1734 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 1735 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1736 } 1737 1738 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 1739 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 1740 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 1741 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 1742 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 1743 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 1744 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 1745 1746 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 1747 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 1748 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 1749 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 1750 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 1751 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 1752 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 1753 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 1754 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 1755 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 1756 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 1757 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 1758 1759 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 1760 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 1761 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 1762 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 1763 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 1764 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 1765 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 1766 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 1767 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 1768 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 1769 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 1770 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 1771 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 1772 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 1773 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 1774 EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD) 1775 1776 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1777 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1778 EXT4_FEATURE_INCOMPAT_META_BG) 1779 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1780 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1781 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1782 1783 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1784 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1785 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1786 EXT4_FEATURE_INCOMPAT_META_BG) 1787 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1788 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1789 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1790 1791 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1792 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1793 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1794 EXT4_FEATURE_INCOMPAT_META_BG| \ 1795 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1796 EXT4_FEATURE_INCOMPAT_64BIT| \ 1797 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1798 EXT4_FEATURE_INCOMPAT_EA_INODE| \ 1799 EXT4_FEATURE_INCOMPAT_MMP | \ 1800 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 1801 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 1802 EXT4_FEATURE_INCOMPAT_CASEFOLD | \ 1803 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \ 1804 EXT4_FEATURE_INCOMPAT_LARGEDIR) 1805 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1806 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1807 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1808 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1809 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1810 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1811 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1812 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1813 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1814 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 1815 EXT4_FEATURE_RO_COMPAT_PROJECT) 1816 1817 #define EXTN_FEATURE_FUNCS(ver) \ 1818 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 1819 { \ 1820 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1821 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 1822 } \ 1823 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 1824 { \ 1825 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1826 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 1827 } \ 1828 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 1829 { \ 1830 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1831 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 1832 } 1833 1834 EXTN_FEATURE_FUNCS(2) 1835 EXTN_FEATURE_FUNCS(3) 1836 EXTN_FEATURE_FUNCS(4) 1837 1838 static inline bool ext4_has_compat_features(struct super_block *sb) 1839 { 1840 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 1841 } 1842 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 1843 { 1844 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 1845 } 1846 static inline bool ext4_has_incompat_features(struct super_block *sb) 1847 { 1848 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 1849 } 1850 1851 /* 1852 * Superblock flags 1853 */ 1854 #define EXT4_FLAGS_RESIZING 0 1855 #define EXT4_FLAGS_SHUTDOWN 1 1856 1857 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi) 1858 { 1859 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 1860 } 1861 1862 1863 /* 1864 * Default values for user and/or group using reserved blocks 1865 */ 1866 #define EXT4_DEF_RESUID 0 1867 #define EXT4_DEF_RESGID 0 1868 1869 /* 1870 * Default project ID 1871 */ 1872 #define EXT4_DEF_PROJID 0 1873 1874 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1875 1876 /* 1877 * Default mount options 1878 */ 1879 #define EXT4_DEFM_DEBUG 0x0001 1880 #define EXT4_DEFM_BSDGROUPS 0x0002 1881 #define EXT4_DEFM_XATTR_USER 0x0004 1882 #define EXT4_DEFM_ACL 0x0008 1883 #define EXT4_DEFM_UID16 0x0010 1884 #define EXT4_DEFM_JMODE 0x0060 1885 #define EXT4_DEFM_JMODE_DATA 0x0020 1886 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1887 #define EXT4_DEFM_JMODE_WBACK 0x0060 1888 #define EXT4_DEFM_NOBARRIER 0x0100 1889 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1890 #define EXT4_DEFM_DISCARD 0x0400 1891 #define EXT4_DEFM_NODELALLOC 0x0800 1892 1893 /* 1894 * Default journal batch times 1895 */ 1896 #define EXT4_DEF_MIN_BATCH_TIME 0 1897 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1898 1899 /* 1900 * Minimum number of groups in a flexgroup before we separate out 1901 * directories into the first block group of a flexgroup 1902 */ 1903 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1904 1905 /* 1906 * Structure of a directory entry 1907 */ 1908 #define EXT4_NAME_LEN 255 1909 1910 struct ext4_dir_entry { 1911 __le32 inode; /* Inode number */ 1912 __le16 rec_len; /* Directory entry length */ 1913 __le16 name_len; /* Name length */ 1914 char name[EXT4_NAME_LEN]; /* File name */ 1915 }; 1916 1917 /* 1918 * The new version of the directory entry. Since EXT4 structures are 1919 * stored in intel byte order, and the name_len field could never be 1920 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1921 * file_type field. 1922 */ 1923 struct ext4_dir_entry_2 { 1924 __le32 inode; /* Inode number */ 1925 __le16 rec_len; /* Directory entry length */ 1926 __u8 name_len; /* Name length */ 1927 __u8 file_type; 1928 char name[EXT4_NAME_LEN]; /* File name */ 1929 }; 1930 1931 /* 1932 * This is a bogus directory entry at the end of each leaf block that 1933 * records checksums. 1934 */ 1935 struct ext4_dir_entry_tail { 1936 __le32 det_reserved_zero1; /* Pretend to be unused */ 1937 __le16 det_rec_len; /* 12 */ 1938 __u8 det_reserved_zero2; /* Zero name length */ 1939 __u8 det_reserved_ft; /* 0xDE, fake file type */ 1940 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1941 }; 1942 1943 #define EXT4_DIRENT_TAIL(block, blocksize) \ 1944 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 1945 ((blocksize) - \ 1946 sizeof(struct ext4_dir_entry_tail)))) 1947 1948 /* 1949 * Ext4 directory file types. Only the low 3 bits are used. The 1950 * other bits are reserved for now. 1951 */ 1952 #define EXT4_FT_UNKNOWN 0 1953 #define EXT4_FT_REG_FILE 1 1954 #define EXT4_FT_DIR 2 1955 #define EXT4_FT_CHRDEV 3 1956 #define EXT4_FT_BLKDEV 4 1957 #define EXT4_FT_FIFO 5 1958 #define EXT4_FT_SOCK 6 1959 #define EXT4_FT_SYMLINK 7 1960 1961 #define EXT4_FT_MAX 8 1962 1963 #define EXT4_FT_DIR_CSUM 0xDE 1964 1965 /* 1966 * EXT4_DIR_PAD defines the directory entries boundaries 1967 * 1968 * NOTE: It must be a multiple of 4 1969 */ 1970 #define EXT4_DIR_PAD 4 1971 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1972 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1973 ~EXT4_DIR_ROUND) 1974 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1975 1976 /* 1977 * If we ever get support for fs block sizes > page_size, we'll need 1978 * to remove the #if statements in the next two functions... 1979 */ 1980 static inline unsigned int 1981 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1982 { 1983 unsigned len = le16_to_cpu(dlen); 1984 1985 #if (PAGE_SIZE >= 65536) 1986 if (len == EXT4_MAX_REC_LEN || len == 0) 1987 return blocksize; 1988 return (len & 65532) | ((len & 3) << 16); 1989 #else 1990 return len; 1991 #endif 1992 } 1993 1994 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1995 { 1996 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1997 BUG(); 1998 #if (PAGE_SIZE >= 65536) 1999 if (len < 65536) 2000 return cpu_to_le16(len); 2001 if (len == blocksize) { 2002 if (blocksize == 65536) 2003 return cpu_to_le16(EXT4_MAX_REC_LEN); 2004 else 2005 return cpu_to_le16(0); 2006 } 2007 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 2008 #else 2009 return cpu_to_le16(len); 2010 #endif 2011 } 2012 2013 /* 2014 * Hash Tree Directory indexing 2015 * (c) Daniel Phillips, 2001 2016 */ 2017 2018 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2019 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2020 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \ 2021 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir))) 2022 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2023 2024 /* Legal values for the dx_root hash_version field: */ 2025 2026 #define DX_HASH_LEGACY 0 2027 #define DX_HASH_HALF_MD4 1 2028 #define DX_HASH_TEA 2 2029 #define DX_HASH_LEGACY_UNSIGNED 3 2030 #define DX_HASH_HALF_MD4_UNSIGNED 4 2031 #define DX_HASH_TEA_UNSIGNED 5 2032 2033 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 2034 const void *address, unsigned int length) 2035 { 2036 struct { 2037 struct shash_desc shash; 2038 char ctx[4]; 2039 } desc; 2040 2041 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2042 2043 desc.shash.tfm = sbi->s_chksum_driver; 2044 *(u32 *)desc.ctx = crc; 2045 2046 BUG_ON(crypto_shash_update(&desc.shash, address, length)); 2047 2048 return *(u32 *)desc.ctx; 2049 } 2050 2051 #ifdef __KERNEL__ 2052 2053 /* hash info structure used by the directory hash */ 2054 struct dx_hash_info 2055 { 2056 u32 hash; 2057 u32 minor_hash; 2058 int hash_version; 2059 u32 *seed; 2060 }; 2061 2062 2063 /* 32 and 64 bit signed EOF for dx directories */ 2064 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2065 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2066 2067 2068 /* 2069 * Control parameters used by ext4_htree_next_block 2070 */ 2071 #define HASH_NB_ALWAYS 1 2072 2073 struct ext4_filename { 2074 const struct qstr *usr_fname; 2075 struct fscrypt_str disk_name; 2076 struct dx_hash_info hinfo; 2077 #ifdef CONFIG_FS_ENCRYPTION 2078 struct fscrypt_str crypto_buf; 2079 #endif 2080 }; 2081 2082 #define fname_name(p) ((p)->disk_name.name) 2083 #define fname_len(p) ((p)->disk_name.len) 2084 2085 /* 2086 * Describe an inode's exact location on disk and in memory 2087 */ 2088 struct ext4_iloc 2089 { 2090 struct buffer_head *bh; 2091 unsigned long offset; 2092 ext4_group_t block_group; 2093 }; 2094 2095 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2096 { 2097 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2098 } 2099 2100 static inline bool ext4_is_quota_file(struct inode *inode) 2101 { 2102 return IS_NOQUOTA(inode) && 2103 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL); 2104 } 2105 2106 /* 2107 * This structure is stuffed into the struct file's private_data field 2108 * for directories. It is where we put information so that we can do 2109 * readdir operations in hash tree order. 2110 */ 2111 struct dir_private_info { 2112 struct rb_root root; 2113 struct rb_node *curr_node; 2114 struct fname *extra_fname; 2115 loff_t last_pos; 2116 __u32 curr_hash; 2117 __u32 curr_minor_hash; 2118 __u32 next_hash; 2119 }; 2120 2121 /* calculate the first block number of the group */ 2122 static inline ext4_fsblk_t 2123 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2124 { 2125 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2126 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2127 } 2128 2129 /* 2130 * Special error return code only used by dx_probe() and its callers. 2131 */ 2132 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2133 2134 /* htree levels for ext4 */ 2135 #define EXT4_HTREE_LEVEL_COMPAT 2 2136 #define EXT4_HTREE_LEVEL 3 2137 2138 static inline int ext4_dir_htree_level(struct super_block *sb) 2139 { 2140 return ext4_has_feature_largedir(sb) ? 2141 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT; 2142 } 2143 2144 /* 2145 * Timeout and state flag for lazy initialization inode thread. 2146 */ 2147 #define EXT4_DEF_LI_WAIT_MULT 10 2148 #define EXT4_DEF_LI_MAX_START_DELAY 5 2149 #define EXT4_LAZYINIT_QUIT 0x0001 2150 #define EXT4_LAZYINIT_RUNNING 0x0002 2151 2152 /* 2153 * Lazy inode table initialization info 2154 */ 2155 struct ext4_lazy_init { 2156 unsigned long li_state; 2157 struct list_head li_request_list; 2158 struct mutex li_list_mtx; 2159 }; 2160 2161 struct ext4_li_request { 2162 struct super_block *lr_super; 2163 struct ext4_sb_info *lr_sbi; 2164 ext4_group_t lr_next_group; 2165 struct list_head lr_request; 2166 unsigned long lr_next_sched; 2167 unsigned long lr_timeout; 2168 }; 2169 2170 struct ext4_features { 2171 struct kobject f_kobj; 2172 struct completion f_kobj_unregister; 2173 }; 2174 2175 /* 2176 * This structure will be used for multiple mount protection. It will be 2177 * written into the block number saved in the s_mmp_block field in the 2178 * superblock. Programs that check MMP should assume that if 2179 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2180 * to use the filesystem, regardless of how old the timestamp is. 2181 */ 2182 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2183 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2184 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2185 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2186 2187 struct mmp_struct { 2188 __le32 mmp_magic; /* Magic number for MMP */ 2189 __le32 mmp_seq; /* Sequence no. updated periodically */ 2190 2191 /* 2192 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2193 * purposes and do not affect the correctness of the algorithm 2194 */ 2195 __le64 mmp_time; /* Time last updated */ 2196 char mmp_nodename[64]; /* Node which last updated MMP block */ 2197 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2198 2199 /* 2200 * mmp_check_interval is used to verify if the MMP block has been 2201 * updated on the block device. The value is updated based on the 2202 * maximum time to write the MMP block during an update cycle. 2203 */ 2204 __le16 mmp_check_interval; 2205 2206 __le16 mmp_pad1; 2207 __le32 mmp_pad2[226]; 2208 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2209 }; 2210 2211 /* arguments passed to the mmp thread */ 2212 struct mmpd_data { 2213 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2214 struct super_block *sb; /* super block of the fs */ 2215 }; 2216 2217 /* 2218 * Check interval multiplier 2219 * The MMP block is written every update interval and initially checked every 2220 * update interval x the multiplier (the value is then adapted based on the 2221 * write latency). The reason is that writes can be delayed under load and we 2222 * don't want readers to incorrectly assume that the filesystem is no longer 2223 * in use. 2224 */ 2225 #define EXT4_MMP_CHECK_MULT 2UL 2226 2227 /* 2228 * Minimum interval for MMP checking in seconds. 2229 */ 2230 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2231 2232 /* 2233 * Maximum interval for MMP checking in seconds. 2234 */ 2235 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2236 2237 /* 2238 * Function prototypes 2239 */ 2240 2241 /* 2242 * Ok, these declarations are also in <linux/kernel.h> but none of the 2243 * ext4 source programs needs to include it so they are duplicated here. 2244 */ 2245 # define NORET_TYPE /**/ 2246 # define ATTRIB_NORET __attribute__((noreturn)) 2247 # define NORET_AND noreturn, 2248 2249 /* bitmap.c */ 2250 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2251 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2252 struct ext4_group_desc *gdp, 2253 struct buffer_head *bh, int sz); 2254 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2255 struct ext4_group_desc *gdp, 2256 struct buffer_head *bh, int sz); 2257 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2258 struct ext4_group_desc *gdp, 2259 struct buffer_head *bh); 2260 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2261 struct ext4_group_desc *gdp, 2262 struct buffer_head *bh); 2263 2264 /* balloc.c */ 2265 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2266 ext4_fsblk_t blocknr, 2267 ext4_group_t *blockgrpp, 2268 ext4_grpblk_t *offsetp); 2269 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2270 ext4_fsblk_t block); 2271 2272 extern unsigned int ext4_block_group(struct super_block *sb, 2273 ext4_fsblk_t blocknr); 2274 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2275 ext4_fsblk_t blocknr); 2276 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2277 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2278 ext4_group_t group); 2279 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2280 ext4_fsblk_t goal, 2281 unsigned int flags, 2282 unsigned long *count, 2283 int *errp); 2284 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2285 s64 nclusters, unsigned int flags); 2286 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2287 extern void ext4_check_blocks_bitmap(struct super_block *); 2288 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2289 ext4_group_t block_group, 2290 struct buffer_head ** bh); 2291 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2292 2293 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2294 ext4_group_t block_group); 2295 extern int ext4_wait_block_bitmap(struct super_block *sb, 2296 ext4_group_t block_group, 2297 struct buffer_head *bh); 2298 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2299 ext4_group_t block_group); 2300 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2301 ext4_group_t block_group, 2302 struct ext4_group_desc *gdp); 2303 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2304 2305 #ifdef CONFIG_FS_ENCRYPTION 2306 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst, 2307 const struct fscrypt_name *src) 2308 { 2309 memset(dst, 0, sizeof(*dst)); 2310 2311 dst->usr_fname = src->usr_fname; 2312 dst->disk_name = src->disk_name; 2313 dst->hinfo.hash = src->hash; 2314 dst->hinfo.minor_hash = src->minor_hash; 2315 dst->crypto_buf = src->crypto_buf; 2316 } 2317 2318 static inline int ext4_fname_setup_filename(struct inode *dir, 2319 const struct qstr *iname, 2320 int lookup, 2321 struct ext4_filename *fname) 2322 { 2323 struct fscrypt_name name; 2324 int err; 2325 2326 err = fscrypt_setup_filename(dir, iname, lookup, &name); 2327 if (err) 2328 return err; 2329 2330 ext4_fname_from_fscrypt_name(fname, &name); 2331 return 0; 2332 } 2333 2334 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2335 struct dentry *dentry, 2336 struct ext4_filename *fname) 2337 { 2338 struct fscrypt_name name; 2339 int err; 2340 2341 err = fscrypt_prepare_lookup(dir, dentry, &name); 2342 if (err) 2343 return err; 2344 2345 ext4_fname_from_fscrypt_name(fname, &name); 2346 return 0; 2347 } 2348 2349 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2350 { 2351 struct fscrypt_name name; 2352 2353 name.crypto_buf = fname->crypto_buf; 2354 fscrypt_free_filename(&name); 2355 2356 fname->crypto_buf.name = NULL; 2357 fname->usr_fname = NULL; 2358 fname->disk_name.name = NULL; 2359 } 2360 #else /* !CONFIG_FS_ENCRYPTION */ 2361 static inline int ext4_fname_setup_filename(struct inode *dir, 2362 const struct qstr *iname, 2363 int lookup, 2364 struct ext4_filename *fname) 2365 { 2366 fname->usr_fname = iname; 2367 fname->disk_name.name = (unsigned char *) iname->name; 2368 fname->disk_name.len = iname->len; 2369 return 0; 2370 } 2371 2372 static inline int ext4_fname_prepare_lookup(struct inode *dir, 2373 struct dentry *dentry, 2374 struct ext4_filename *fname) 2375 { 2376 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname); 2377 } 2378 2379 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { } 2380 #endif /* !CONFIG_FS_ENCRYPTION */ 2381 2382 /* dir.c */ 2383 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2384 struct file *, 2385 struct ext4_dir_entry_2 *, 2386 struct buffer_head *, char *, int, 2387 unsigned int); 2388 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2389 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2390 (de), (bh), (buf), (size), (offset))) 2391 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2392 __u32 minor_hash, 2393 struct ext4_dir_entry_2 *dirent, 2394 struct fscrypt_str *ent_name); 2395 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2396 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2397 struct buffer_head *bh, 2398 void *buf, int buf_size, 2399 struct ext4_filename *fname, 2400 struct ext4_dir_entry_2 **dest_de); 2401 void ext4_insert_dentry(struct inode *inode, 2402 struct ext4_dir_entry_2 *de, 2403 int buf_size, 2404 struct ext4_filename *fname); 2405 static inline void ext4_update_dx_flag(struct inode *inode) 2406 { 2407 if (!ext4_has_feature_dir_index(inode->i_sb)) 2408 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2409 } 2410 static const unsigned char ext4_filetype_table[] = { 2411 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2412 }; 2413 2414 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2415 { 2416 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2417 return DT_UNKNOWN; 2418 2419 return ext4_filetype_table[filetype]; 2420 } 2421 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2422 void *buf, int buf_size); 2423 2424 /* fsync.c */ 2425 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2426 2427 /* hash.c */ 2428 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len, 2429 struct dx_hash_info *hinfo); 2430 2431 /* ialloc.c */ 2432 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2433 const struct qstr *qstr, __u32 goal, 2434 uid_t *owner, __u32 i_flags, 2435 int handle_type, unsigned int line_no, 2436 int nblocks); 2437 2438 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \ 2439 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2440 i_flags, 0, 0, 0) 2441 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2442 type, nblocks) \ 2443 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2444 0, (type), __LINE__, (nblocks)) 2445 2446 2447 extern void ext4_free_inode(handle_t *, struct inode *); 2448 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2449 extern unsigned long ext4_count_free_inodes(struct super_block *); 2450 extern unsigned long ext4_count_dirs(struct super_block *); 2451 extern void ext4_check_inodes_bitmap(struct super_block *); 2452 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2453 extern int ext4_init_inode_table(struct super_block *sb, 2454 ext4_group_t group, int barrier); 2455 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2456 2457 /* mballoc.c */ 2458 extern const struct seq_operations ext4_mb_seq_groups_ops; 2459 extern long ext4_mb_stats; 2460 extern long ext4_mb_max_to_scan; 2461 extern int ext4_mb_init(struct super_block *); 2462 extern int ext4_mb_release(struct super_block *); 2463 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2464 struct ext4_allocation_request *, int *); 2465 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2466 extern void ext4_discard_preallocations(struct inode *); 2467 extern int __init ext4_init_mballoc(void); 2468 extern void ext4_exit_mballoc(void); 2469 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2470 struct buffer_head *bh, ext4_fsblk_t block, 2471 unsigned long count, int flags); 2472 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2473 ext4_group_t ngroups); 2474 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2475 ext4_group_t i, struct ext4_group_desc *desc); 2476 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2477 ext4_fsblk_t block, unsigned long count); 2478 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2479 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid); 2480 2481 /* inode.c */ 2482 int ext4_inode_is_fast_symlink(struct inode *inode); 2483 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2484 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2485 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count, 2486 bool wait, struct buffer_head **bhs); 2487 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2488 struct buffer_head *bh_result, int create); 2489 int ext4_get_block(struct inode *inode, sector_t iblock, 2490 struct buffer_head *bh_result, int create); 2491 int ext4_dio_get_block(struct inode *inode, sector_t iblock, 2492 struct buffer_head *bh_result, int create); 2493 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2494 struct buffer_head *bh, int create); 2495 int ext4_walk_page_buffers(handle_t *handle, 2496 struct buffer_head *head, 2497 unsigned from, 2498 unsigned to, 2499 int *partial, 2500 int (*fn)(handle_t *handle, 2501 struct buffer_head *bh)); 2502 int do_journal_get_write_access(handle_t *handle, 2503 struct buffer_head *bh); 2504 #define FALL_BACK_TO_NONDELALLOC 1 2505 #define CONVERT_INLINE_DATA 2 2506 2507 typedef enum { 2508 EXT4_IGET_NORMAL = 0, 2509 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */ 2510 EXT4_IGET_HANDLE = 0x0002 /* Inode # is from a handle */ 2511 } ext4_iget_flags; 2512 2513 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, 2514 ext4_iget_flags flags, const char *function, 2515 unsigned int line); 2516 2517 #define ext4_iget(sb, ino, flags) \ 2518 __ext4_iget((sb), (ino), (flags), __func__, __LINE__) 2519 2520 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2521 extern int ext4_setattr(struct dentry *, struct iattr *); 2522 extern int ext4_getattr(const struct path *, struct kstat *, u32, unsigned int); 2523 extern void ext4_evict_inode(struct inode *); 2524 extern void ext4_clear_inode(struct inode *); 2525 extern int ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int); 2526 extern int ext4_sync_inode(handle_t *, struct inode *); 2527 extern void ext4_dirty_inode(struct inode *, int); 2528 extern int ext4_change_inode_journal_flag(struct inode *, int); 2529 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2530 extern int ext4_inode_attach_jinode(struct inode *inode); 2531 extern int ext4_can_truncate(struct inode *inode); 2532 extern int ext4_truncate(struct inode *); 2533 extern int ext4_break_layouts(struct inode *); 2534 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2535 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 2536 extern void ext4_set_inode_flags(struct inode *); 2537 extern int ext4_alloc_da_blocks(struct inode *inode); 2538 extern void ext4_set_aops(struct inode *inode); 2539 extern int ext4_writepage_trans_blocks(struct inode *); 2540 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2541 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2542 loff_t lstart, loff_t lend); 2543 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf); 2544 extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf); 2545 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2546 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 2547 extern void ext4_da_release_space(struct inode *inode, int to_free); 2548 extern void ext4_da_update_reserve_space(struct inode *inode, 2549 int used, int quota_claim); 2550 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 2551 ext4_fsblk_t pblk, ext4_lblk_t len); 2552 2553 /* indirect.c */ 2554 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2555 struct ext4_map_blocks *map, int flags); 2556 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2557 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2558 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2559 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2560 ext4_lblk_t start, ext4_lblk_t end); 2561 2562 /* ioctl.c */ 2563 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2564 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2565 2566 /* migrate.c */ 2567 extern int ext4_ext_migrate(struct inode *); 2568 extern int ext4_ind_migrate(struct inode *inode); 2569 2570 /* namei.c */ 2571 extern int ext4_dirent_csum_verify(struct inode *inode, 2572 struct ext4_dir_entry *dirent); 2573 extern int ext4_orphan_add(handle_t *, struct inode *); 2574 extern int ext4_orphan_del(handle_t *, struct inode *); 2575 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2576 __u32 start_minor_hash, __u32 *next_hash); 2577 extern int ext4_search_dir(struct buffer_head *bh, 2578 char *search_buf, 2579 int buf_size, 2580 struct inode *dir, 2581 struct ext4_filename *fname, 2582 unsigned int offset, 2583 struct ext4_dir_entry_2 **res_dir); 2584 extern int ext4_generic_delete_entry(handle_t *handle, 2585 struct inode *dir, 2586 struct ext4_dir_entry_2 *de_del, 2587 struct buffer_head *bh, 2588 void *entry_buf, 2589 int buf_size, 2590 int csum_size); 2591 extern bool ext4_empty_dir(struct inode *inode); 2592 2593 /* resize.c */ 2594 extern int ext4_group_add(struct super_block *sb, 2595 struct ext4_new_group_data *input); 2596 extern int ext4_group_extend(struct super_block *sb, 2597 struct ext4_super_block *es, 2598 ext4_fsblk_t n_blocks_count); 2599 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2600 2601 /* super.c */ 2602 extern struct buffer_head *ext4_sb_bread(struct super_block *sb, 2603 sector_t block, int op_flags); 2604 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 2605 extern int ext4_calculate_overhead(struct super_block *sb); 2606 extern void ext4_superblock_csum_set(struct super_block *sb); 2607 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 2608 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 2609 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2610 ext4_group_t ngroup); 2611 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2612 char nbuf[16]); 2613 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb, 2614 ext4_group_t block_group, 2615 unsigned int flags); 2616 2617 extern __printf(4, 5) 2618 void __ext4_error(struct super_block *, const char *, unsigned int, 2619 const char *, ...); 2620 extern __printf(5, 6) 2621 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2622 const char *, ...); 2623 extern __printf(5, 6) 2624 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2625 const char *, ...); 2626 extern void __ext4_std_error(struct super_block *, const char *, 2627 unsigned int, int); 2628 extern __printf(4, 5) 2629 void __ext4_abort(struct super_block *, const char *, unsigned int, 2630 const char *, ...); 2631 extern __printf(4, 5) 2632 void __ext4_warning(struct super_block *, const char *, unsigned int, 2633 const char *, ...); 2634 extern __printf(4, 5) 2635 void __ext4_warning_inode(const struct inode *inode, const char *function, 2636 unsigned int line, const char *fmt, ...); 2637 extern __printf(3, 4) 2638 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2639 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2640 const char *, unsigned int, const char *); 2641 extern __printf(7, 8) 2642 void __ext4_grp_locked_error(const char *, unsigned int, 2643 struct super_block *, ext4_group_t, 2644 unsigned long, ext4_fsblk_t, 2645 const char *, ...); 2646 2647 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 2648 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 2649 2650 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 2651 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 2652 2653 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 2654 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 2655 2656 #ifdef CONFIG_PRINTK 2657 2658 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2659 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__) 2660 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2661 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2662 #define ext4_error(sb, fmt, ...) \ 2663 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2664 #define ext4_abort(sb, fmt, ...) \ 2665 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2666 #define ext4_warning(sb, fmt, ...) \ 2667 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2668 #define ext4_warning_inode(inode, fmt, ...) \ 2669 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 2670 #define ext4_msg(sb, level, fmt, ...) \ 2671 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 2672 #define dump_mmp_msg(sb, mmp, msg) \ 2673 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 2674 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2675 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 2676 fmt, ##__VA_ARGS__) 2677 2678 #else 2679 2680 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2681 do { \ 2682 no_printk(fmt, ##__VA_ARGS__); \ 2683 __ext4_error_inode(inode, "", 0, block, " "); \ 2684 } while (0) 2685 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2686 do { \ 2687 no_printk(fmt, ##__VA_ARGS__); \ 2688 __ext4_error_file(file, "", 0, block, " "); \ 2689 } while (0) 2690 #define ext4_error(sb, fmt, ...) \ 2691 do { \ 2692 no_printk(fmt, ##__VA_ARGS__); \ 2693 __ext4_error(sb, "", 0, " "); \ 2694 } while (0) 2695 #define ext4_abort(sb, fmt, ...) \ 2696 do { \ 2697 no_printk(fmt, ##__VA_ARGS__); \ 2698 __ext4_abort(sb, "", 0, " "); \ 2699 } while (0) 2700 #define ext4_warning(sb, fmt, ...) \ 2701 do { \ 2702 no_printk(fmt, ##__VA_ARGS__); \ 2703 __ext4_warning(sb, "", 0, " "); \ 2704 } while (0) 2705 #define ext4_warning_inode(inode, fmt, ...) \ 2706 do { \ 2707 no_printk(fmt, ##__VA_ARGS__); \ 2708 __ext4_warning_inode(inode, "", 0, " "); \ 2709 } while (0) 2710 #define ext4_msg(sb, level, fmt, ...) \ 2711 do { \ 2712 no_printk(fmt, ##__VA_ARGS__); \ 2713 __ext4_msg(sb, "", " "); \ 2714 } while (0) 2715 #define dump_mmp_msg(sb, mmp, msg) \ 2716 __dump_mmp_msg(sb, mmp, "", 0, "") 2717 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2718 do { \ 2719 no_printk(fmt, ##__VA_ARGS__); \ 2720 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 2721 } while (0) 2722 2723 #endif 2724 2725 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2726 __u32 compat); 2727 extern int ext4_update_rocompat_feature(handle_t *handle, 2728 struct super_block *sb, __u32 rocompat); 2729 extern int ext4_update_incompat_feature(handle_t *handle, 2730 struct super_block *sb, __u32 incompat); 2731 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2732 struct ext4_group_desc *bg); 2733 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2734 struct ext4_group_desc *bg); 2735 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2736 struct ext4_group_desc *bg); 2737 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2738 struct ext4_group_desc *bg); 2739 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2740 struct ext4_group_desc *bg); 2741 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2742 struct ext4_group_desc *bg); 2743 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2744 struct ext4_group_desc *bg); 2745 extern void ext4_block_bitmap_set(struct super_block *sb, 2746 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2747 extern void ext4_inode_bitmap_set(struct super_block *sb, 2748 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2749 extern void ext4_inode_table_set(struct super_block *sb, 2750 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2751 extern void ext4_free_group_clusters_set(struct super_block *sb, 2752 struct ext4_group_desc *bg, 2753 __u32 count); 2754 extern void ext4_free_inodes_set(struct super_block *sb, 2755 struct ext4_group_desc *bg, __u32 count); 2756 extern void ext4_used_dirs_set(struct super_block *sb, 2757 struct ext4_group_desc *bg, __u32 count); 2758 extern void ext4_itable_unused_set(struct super_block *sb, 2759 struct ext4_group_desc *bg, __u32 count); 2760 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2761 struct ext4_group_desc *gdp); 2762 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2763 struct ext4_group_desc *gdp); 2764 extern int ext4_register_li_request(struct super_block *sb, 2765 ext4_group_t first_not_zeroed); 2766 2767 static inline int ext4_has_metadata_csum(struct super_block *sb) 2768 { 2769 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 2770 !EXT4_SB(sb)->s_chksum_driver); 2771 2772 return ext4_has_feature_metadata_csum(sb) && 2773 (EXT4_SB(sb)->s_chksum_driver != NULL); 2774 } 2775 2776 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2777 { 2778 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb); 2779 } 2780 2781 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2782 { 2783 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2784 le32_to_cpu(es->s_blocks_count_lo); 2785 } 2786 2787 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2788 { 2789 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2790 le32_to_cpu(es->s_r_blocks_count_lo); 2791 } 2792 2793 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2794 { 2795 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2796 le32_to_cpu(es->s_free_blocks_count_lo); 2797 } 2798 2799 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2800 ext4_fsblk_t blk) 2801 { 2802 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2803 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2804 } 2805 2806 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2807 ext4_fsblk_t blk) 2808 { 2809 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2810 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2811 } 2812 2813 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2814 ext4_fsblk_t blk) 2815 { 2816 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2817 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2818 } 2819 2820 static inline loff_t ext4_isize(struct super_block *sb, 2821 struct ext4_inode *raw_inode) 2822 { 2823 if (ext4_has_feature_largedir(sb) || 2824 S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2825 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2826 le32_to_cpu(raw_inode->i_size_lo); 2827 2828 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2829 } 2830 2831 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2832 { 2833 raw_inode->i_size_lo = cpu_to_le32(i_size); 2834 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2835 } 2836 2837 static inline 2838 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2839 ext4_group_t group) 2840 { 2841 struct ext4_group_info ***grp_info; 2842 long indexv, indexh; 2843 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 2844 grp_info = EXT4_SB(sb)->s_group_info; 2845 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2846 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2847 return grp_info[indexv][indexh]; 2848 } 2849 2850 /* 2851 * Reading s_groups_count requires using smp_rmb() afterwards. See 2852 * the locking protocol documented in the comments of ext4_group_add() 2853 * in resize.c 2854 */ 2855 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2856 { 2857 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2858 2859 smp_rmb(); 2860 return ngroups; 2861 } 2862 2863 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2864 ext4_group_t block_group) 2865 { 2866 return block_group >> sbi->s_log_groups_per_flex; 2867 } 2868 2869 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2870 { 2871 return 1 << sbi->s_log_groups_per_flex; 2872 } 2873 2874 #define ext4_std_error(sb, errno) \ 2875 do { \ 2876 if ((errno)) \ 2877 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2878 } while (0) 2879 2880 #ifdef CONFIG_SMP 2881 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2882 * counters. So we need to make sure we have free clusters more 2883 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2884 */ 2885 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2886 #else 2887 #define EXT4_FREECLUSTERS_WATERMARK 0 2888 #endif 2889 2890 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 2891 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2892 { 2893 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 2894 !inode_is_locked(inode)); 2895 down_write(&EXT4_I(inode)->i_data_sem); 2896 if (newsize > EXT4_I(inode)->i_disksize) 2897 EXT4_I(inode)->i_disksize = newsize; 2898 up_write(&EXT4_I(inode)->i_data_sem); 2899 } 2900 2901 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 2902 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 2903 { 2904 int changed = 0; 2905 2906 if (newsize > inode->i_size) { 2907 i_size_write(inode, newsize); 2908 changed = 1; 2909 } 2910 if (newsize > EXT4_I(inode)->i_disksize) { 2911 ext4_update_i_disksize(inode, newsize); 2912 changed |= 2; 2913 } 2914 return changed; 2915 } 2916 2917 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 2918 loff_t len); 2919 2920 struct ext4_group_info { 2921 unsigned long bb_state; 2922 struct rb_root bb_free_root; 2923 ext4_grpblk_t bb_first_free; /* first free block */ 2924 ext4_grpblk_t bb_free; /* total free blocks */ 2925 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 2926 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 2927 struct list_head bb_prealloc_list; 2928 #ifdef DOUBLE_CHECK 2929 void *bb_bitmap; 2930 #endif 2931 struct rw_semaphore alloc_sem; 2932 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2933 * regions, index is order. 2934 * bb_counters[3] = 5 means 2935 * 5 free 8-block regions. */ 2936 }; 2937 2938 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 2939 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 2940 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 2941 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 2942 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \ 2943 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT) 2944 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \ 2945 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT) 2946 2947 #define EXT4_MB_GRP_NEED_INIT(grp) \ 2948 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 2949 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 2950 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2951 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 2952 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2953 2954 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 2955 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2956 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 2957 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2958 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 2959 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2960 2961 #define EXT4_MAX_CONTENTION 8 2962 #define EXT4_CONTENTION_THRESHOLD 2 2963 2964 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2965 ext4_group_t group) 2966 { 2967 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2968 } 2969 2970 /* 2971 * Returns true if the filesystem is busy enough that attempts to 2972 * access the block group locks has run into contention. 2973 */ 2974 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 2975 { 2976 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 2977 } 2978 2979 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 2980 { 2981 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 2982 if (spin_trylock(lock)) 2983 /* 2984 * We're able to grab the lock right away, so drop the 2985 * lock contention counter. 2986 */ 2987 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 2988 else { 2989 /* 2990 * The lock is busy, so bump the contention counter, 2991 * and then wait on the spin lock. 2992 */ 2993 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 2994 EXT4_MAX_CONTENTION); 2995 spin_lock(lock); 2996 } 2997 } 2998 2999 static inline void ext4_unlock_group(struct super_block *sb, 3000 ext4_group_t group) 3001 { 3002 spin_unlock(ext4_group_lock_ptr(sb, group)); 3003 } 3004 3005 /* 3006 * Block validity checking 3007 */ 3008 #define ext4_check_indirect_blockref(inode, bh) \ 3009 ext4_check_blockref(__func__, __LINE__, inode, \ 3010 (__le32 *)(bh)->b_data, \ 3011 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 3012 3013 #define ext4_ind_check_inode(inode) \ 3014 ext4_check_blockref(__func__, __LINE__, inode, \ 3015 EXT4_I(inode)->i_data, \ 3016 EXT4_NDIR_BLOCKS) 3017 3018 /* 3019 * Inodes and files operations 3020 */ 3021 3022 /* dir.c */ 3023 extern const struct file_operations ext4_dir_operations; 3024 3025 #ifdef CONFIG_UNICODE 3026 extern const struct dentry_operations ext4_dentry_ops; 3027 #endif 3028 3029 /* file.c */ 3030 extern const struct inode_operations ext4_file_inode_operations; 3031 extern const struct file_operations ext4_file_operations; 3032 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 3033 3034 /* inline.c */ 3035 extern int ext4_get_max_inline_size(struct inode *inode); 3036 extern int ext4_find_inline_data_nolock(struct inode *inode); 3037 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 3038 unsigned int len); 3039 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 3040 3041 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 3042 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 3043 struct inode *inode, 3044 loff_t pos, unsigned len, 3045 unsigned flags, 3046 struct page **pagep); 3047 extern int ext4_write_inline_data_end(struct inode *inode, 3048 loff_t pos, unsigned len, 3049 unsigned copied, 3050 struct page *page); 3051 extern struct buffer_head * 3052 ext4_journalled_write_inline_data(struct inode *inode, 3053 unsigned len, 3054 struct page *page); 3055 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 3056 struct inode *inode, 3057 loff_t pos, unsigned len, 3058 unsigned flags, 3059 struct page **pagep, 3060 void **fsdata); 3061 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 3062 unsigned len, unsigned copied, 3063 struct page *page); 3064 extern int ext4_try_add_inline_entry(handle_t *handle, 3065 struct ext4_filename *fname, 3066 struct inode *dir, struct inode *inode); 3067 extern int ext4_try_create_inline_dir(handle_t *handle, 3068 struct inode *parent, 3069 struct inode *inode); 3070 extern int ext4_read_inline_dir(struct file *filp, 3071 struct dir_context *ctx, 3072 int *has_inline_data); 3073 extern int htree_inlinedir_to_tree(struct file *dir_file, 3074 struct inode *dir, ext4_lblk_t block, 3075 struct dx_hash_info *hinfo, 3076 __u32 start_hash, __u32 start_minor_hash, 3077 int *has_inline_data); 3078 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3079 struct ext4_filename *fname, 3080 struct ext4_dir_entry_2 **res_dir, 3081 int *has_inline_data); 3082 extern int ext4_delete_inline_entry(handle_t *handle, 3083 struct inode *dir, 3084 struct ext4_dir_entry_2 *de_del, 3085 struct buffer_head *bh, 3086 int *has_inline_data); 3087 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); 3088 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3089 struct ext4_dir_entry_2 **parent_de, 3090 int *retval); 3091 extern int ext4_inline_data_fiemap(struct inode *inode, 3092 struct fiemap_extent_info *fieinfo, 3093 int *has_inline, __u64 start, __u64 len); 3094 3095 struct iomap; 3096 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap); 3097 3098 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3099 3100 extern int ext4_convert_inline_data(struct inode *inode); 3101 3102 static inline int ext4_has_inline_data(struct inode *inode) 3103 { 3104 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3105 EXT4_I(inode)->i_inline_off; 3106 } 3107 3108 /* namei.c */ 3109 extern const struct inode_operations ext4_dir_inode_operations; 3110 extern const struct inode_operations ext4_special_inode_operations; 3111 extern struct dentry *ext4_get_parent(struct dentry *child); 3112 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3113 struct ext4_dir_entry_2 *de, 3114 int blocksize, int csum_size, 3115 unsigned int parent_ino, int dotdot_real_len); 3116 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t, 3117 unsigned int blocksize); 3118 extern int ext4_handle_dirty_dirent_node(handle_t *handle, 3119 struct inode *inode, 3120 struct buffer_head *bh); 3121 extern int ext4_ci_compare(const struct inode *parent, 3122 const struct qstr *name, 3123 const struct qstr *entry); 3124 3125 #define S_SHIFT 12 3126 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = { 3127 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3128 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3129 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3130 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3131 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3132 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3133 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3134 }; 3135 3136 static inline void ext4_set_de_type(struct super_block *sb, 3137 struct ext4_dir_entry_2 *de, 3138 umode_t mode) { 3139 if (ext4_has_feature_filetype(sb)) 3140 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3141 } 3142 3143 /* readpages.c */ 3144 extern int ext4_mpage_readpages(struct address_space *mapping, 3145 struct list_head *pages, struct page *page, 3146 unsigned nr_pages, bool is_readahead); 3147 3148 /* symlink.c */ 3149 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3150 extern const struct inode_operations ext4_symlink_inode_operations; 3151 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3152 3153 /* sysfs.c */ 3154 extern int ext4_register_sysfs(struct super_block *sb); 3155 extern void ext4_unregister_sysfs(struct super_block *sb); 3156 extern int __init ext4_init_sysfs(void); 3157 extern void ext4_exit_sysfs(void); 3158 3159 /* block_validity */ 3160 extern void ext4_release_system_zone(struct super_block *sb); 3161 extern int ext4_setup_system_zone(struct super_block *sb); 3162 extern int __init ext4_init_system_zone(void); 3163 extern void ext4_exit_system_zone(void); 3164 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 3165 ext4_fsblk_t start_blk, 3166 unsigned int count); 3167 extern int ext4_check_blockref(const char *, unsigned int, 3168 struct inode *, __le32 *, unsigned int); 3169 3170 /* extents.c */ 3171 struct ext4_ext_path; 3172 struct ext4_extent; 3173 3174 /* 3175 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3176 * __le32. 3177 */ 3178 #define EXT_MAX_BLOCKS 0xffffffff 3179 3180 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 3181 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 3182 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3183 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3184 struct ext4_map_blocks *map, int flags); 3185 extern int ext4_ext_truncate(handle_t *, struct inode *); 3186 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3187 ext4_lblk_t end); 3188 extern void ext4_ext_init(struct super_block *); 3189 extern void ext4_ext_release(struct super_block *); 3190 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3191 loff_t len); 3192 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3193 loff_t offset, ssize_t len); 3194 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3195 struct ext4_map_blocks *map, int flags); 3196 extern int ext4_ext_calc_metadata_amount(struct inode *inode, 3197 ext4_lblk_t lblocks); 3198 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3199 int num, 3200 struct ext4_ext_path *path); 3201 extern int ext4_can_extents_be_merged(struct inode *inode, 3202 struct ext4_extent *ex1, 3203 struct ext4_extent *ex2); 3204 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3205 struct ext4_ext_path **, 3206 struct ext4_extent *, int); 3207 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3208 struct ext4_ext_path **, 3209 int flags); 3210 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 3211 extern int ext4_ext_check_inode(struct inode *inode); 3212 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3213 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3214 __u64 start, __u64 len); 3215 extern int ext4_ext_precache(struct inode *inode); 3216 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len); 3217 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len); 3218 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3219 struct inode *inode2, ext4_lblk_t lblk1, 3220 ext4_lblk_t lblk2, ext4_lblk_t count, 3221 int mark_unwritten,int *err); 3222 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu); 3223 3224 /* move_extent.c */ 3225 extern void ext4_double_down_write_data_sem(struct inode *first, 3226 struct inode *second); 3227 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3228 struct inode *donor_inode); 3229 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3230 __u64 start_orig, __u64 start_donor, 3231 __u64 len, __u64 *moved_len); 3232 3233 /* page-io.c */ 3234 extern int __init ext4_init_pageio(void); 3235 extern void ext4_exit_pageio(void); 3236 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3237 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3238 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3239 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3240 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3241 struct writeback_control *wbc); 3242 extern void ext4_end_io_rsv_work(struct work_struct *work); 3243 extern void ext4_io_submit(struct ext4_io_submit *io); 3244 extern int ext4_bio_write_page(struct ext4_io_submit *io, 3245 struct page *page, 3246 int len, 3247 struct writeback_control *wbc, 3248 bool keep_towrite); 3249 3250 /* mmp.c */ 3251 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3252 3253 /* 3254 * Add new method to test whether block and inode bitmaps are properly 3255 * initialized. With uninit_bg reading the block from disk is not enough 3256 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3257 */ 3258 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3259 3260 static inline int bitmap_uptodate(struct buffer_head *bh) 3261 { 3262 return (buffer_uptodate(bh) && 3263 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3264 } 3265 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3266 { 3267 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3268 } 3269 3270 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3271 3272 /* For ioend & aio unwritten conversion wait queues */ 3273 #define EXT4_WQ_HASH_SZ 37 3274 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3275 EXT4_WQ_HASH_SZ]) 3276 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3277 3278 extern int ext4_resize_begin(struct super_block *sb); 3279 extern void ext4_resize_end(struct super_block *sb); 3280 3281 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 3282 struct ext4_io_end *io_end) 3283 { 3284 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 3285 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3286 atomic_inc(&EXT4_I(inode)->i_unwritten); 3287 } 3288 } 3289 3290 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3291 { 3292 struct inode *inode = io_end->inode; 3293 3294 if (io_end->flag & EXT4_IO_END_UNWRITTEN) { 3295 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3296 /* Wake up anyone waiting on unwritten extent conversion */ 3297 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) 3298 wake_up_all(ext4_ioend_wq(inode)); 3299 } 3300 } 3301 3302 extern const struct iomap_ops ext4_iomap_ops; 3303 3304 #endif /* __KERNEL__ */ 3305 3306 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3307 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3308 3309 #endif /* _EXT4_H */ 3310