1 /* 2 * ext4.h 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/include/linux/minix_fs.h 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 */ 15 16 #ifndef _EXT4_H 17 #define _EXT4_H 18 19 #include <linux/types.h> 20 #include <linux/blkdev.h> 21 #include <linux/magic.h> 22 #include <linux/jbd2.h> 23 #include <linux/quota.h> 24 #include <linux/rwsem.h> 25 #include <linux/rbtree.h> 26 #include <linux/seqlock.h> 27 #include <linux/mutex.h> 28 #include <linux/timer.h> 29 #include <linux/version.h> 30 #include <linux/wait.h> 31 #include <linux/sched/signal.h> 32 #include <linux/blockgroup_lock.h> 33 #include <linux/percpu_counter.h> 34 #include <linux/ratelimit.h> 35 #include <crypto/hash.h> 36 #ifdef CONFIG_EXT4_FS_ENCRYPTION 37 #include <linux/fscrypt_supp.h> 38 #else 39 #include <linux/fscrypt_notsupp.h> 40 #endif 41 #include <linux/falloc.h> 42 #include <linux/percpu-rwsem.h> 43 #ifdef __KERNEL__ 44 #include <linux/compat.h> 45 #endif 46 47 /* 48 * The fourth extended filesystem constants/structures 49 */ 50 51 /* 52 * with AGGRESSIVE_CHECK allocator runs consistency checks over 53 * structures. these checks slow things down a lot 54 */ 55 #define AGGRESSIVE_CHECK__ 56 57 /* 58 * with DOUBLE_CHECK defined mballoc creates persistent in-core 59 * bitmaps, maintains and uses them to check for double allocations 60 */ 61 #define DOUBLE_CHECK__ 62 63 /* 64 * Define EXT4FS_DEBUG to produce debug messages 65 */ 66 #undef EXT4FS_DEBUG 67 68 /* 69 * Debug code 70 */ 71 #ifdef EXT4FS_DEBUG 72 #define ext4_debug(f, a...) \ 73 do { \ 74 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 75 __FILE__, __LINE__, __func__); \ 76 printk(KERN_DEBUG f, ## a); \ 77 } while (0) 78 #else 79 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 80 #endif 81 82 /* 83 * Turn on EXT_DEBUG to get lots of info about extents operations. 84 */ 85 #define EXT_DEBUG__ 86 #ifdef EXT_DEBUG 87 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__) 88 #else 89 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 90 #endif 91 92 /* data type for block offset of block group */ 93 typedef int ext4_grpblk_t; 94 95 /* data type for filesystem-wide blocks number */ 96 typedef unsigned long long ext4_fsblk_t; 97 98 /* data type for file logical block number */ 99 typedef __u32 ext4_lblk_t; 100 101 /* data type for block group number */ 102 typedef unsigned int ext4_group_t; 103 104 enum SHIFT_DIRECTION { 105 SHIFT_LEFT = 0, 106 SHIFT_RIGHT, 107 }; 108 109 /* 110 * Flags used in mballoc's allocation_context flags field. 111 * 112 * Also used to show what's going on for debugging purposes when the 113 * flag field is exported via the traceport interface 114 */ 115 116 /* prefer goal again. length */ 117 #define EXT4_MB_HINT_MERGE 0x0001 118 /* blocks already reserved */ 119 #define EXT4_MB_HINT_RESERVED 0x0002 120 /* metadata is being allocated */ 121 #define EXT4_MB_HINT_METADATA 0x0004 122 /* first blocks in the file */ 123 #define EXT4_MB_HINT_FIRST 0x0008 124 /* search for the best chunk */ 125 #define EXT4_MB_HINT_BEST 0x0010 126 /* data is being allocated */ 127 #define EXT4_MB_HINT_DATA 0x0020 128 /* don't preallocate (for tails) */ 129 #define EXT4_MB_HINT_NOPREALLOC 0x0040 130 /* allocate for locality group */ 131 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 132 /* allocate goal blocks or none */ 133 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 134 /* goal is meaningful */ 135 #define EXT4_MB_HINT_TRY_GOAL 0x0200 136 /* blocks already pre-reserved by delayed allocation */ 137 #define EXT4_MB_DELALLOC_RESERVED 0x0400 138 /* We are doing stream allocation */ 139 #define EXT4_MB_STREAM_ALLOC 0x0800 140 /* Use reserved root blocks if needed */ 141 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 142 /* Use blocks from reserved pool */ 143 #define EXT4_MB_USE_RESERVED 0x2000 144 145 struct ext4_allocation_request { 146 /* target inode for block we're allocating */ 147 struct inode *inode; 148 /* how many blocks we want to allocate */ 149 unsigned int len; 150 /* logical block in target inode */ 151 ext4_lblk_t logical; 152 /* the closest logical allocated block to the left */ 153 ext4_lblk_t lleft; 154 /* the closest logical allocated block to the right */ 155 ext4_lblk_t lright; 156 /* phys. target (a hint) */ 157 ext4_fsblk_t goal; 158 /* phys. block for the closest logical allocated block to the left */ 159 ext4_fsblk_t pleft; 160 /* phys. block for the closest logical allocated block to the right */ 161 ext4_fsblk_t pright; 162 /* flags. see above EXT4_MB_HINT_* */ 163 unsigned int flags; 164 }; 165 166 /* 167 * Logical to physical block mapping, used by ext4_map_blocks() 168 * 169 * This structure is used to pass requests into ext4_map_blocks() as 170 * well as to store the information returned by ext4_map_blocks(). It 171 * takes less room on the stack than a struct buffer_head. 172 */ 173 #define EXT4_MAP_NEW (1 << BH_New) 174 #define EXT4_MAP_MAPPED (1 << BH_Mapped) 175 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 176 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 177 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 178 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 179 180 struct ext4_map_blocks { 181 ext4_fsblk_t m_pblk; 182 ext4_lblk_t m_lblk; 183 unsigned int m_len; 184 unsigned int m_flags; 185 }; 186 187 /* 188 * Flags for ext4_io_end->flags 189 */ 190 #define EXT4_IO_END_UNWRITTEN 0x0001 191 192 /* 193 * For converting unwritten extents on a work queue. 'handle' is used for 194 * buffered writeback. 195 */ 196 typedef struct ext4_io_end { 197 struct list_head list; /* per-file finished IO list */ 198 handle_t *handle; /* handle reserved for extent 199 * conversion */ 200 struct inode *inode; /* file being written to */ 201 struct bio *bio; /* Linked list of completed 202 * bios covering the extent */ 203 unsigned int flag; /* unwritten or not */ 204 atomic_t count; /* reference counter */ 205 loff_t offset; /* offset in the file */ 206 ssize_t size; /* size of the extent */ 207 } ext4_io_end_t; 208 209 struct ext4_io_submit { 210 struct writeback_control *io_wbc; 211 struct bio *io_bio; 212 ext4_io_end_t *io_end; 213 sector_t io_next_block; 214 }; 215 216 /* 217 * Special inodes numbers 218 */ 219 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 220 #define EXT4_ROOT_INO 2 /* Root inode */ 221 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 222 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 223 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 224 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 225 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 226 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 227 228 /* First non-reserved inode for old ext4 filesystems */ 229 #define EXT4_GOOD_OLD_FIRST_INO 11 230 231 /* 232 * Maximal count of links to a file 233 */ 234 #define EXT4_LINK_MAX 65000 235 236 /* 237 * Macro-instructions used to manage several block sizes 238 */ 239 #define EXT4_MIN_BLOCK_SIZE 1024 240 #define EXT4_MAX_BLOCK_SIZE 65536 241 #define EXT4_MIN_BLOCK_LOG_SIZE 10 242 #define EXT4_MAX_BLOCK_LOG_SIZE 16 243 #define EXT4_MAX_CLUSTER_LOG_SIZE 30 244 #ifdef __KERNEL__ 245 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 246 #else 247 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 248 #endif 249 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 250 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 251 EXT4_SB(s)->s_cluster_bits) 252 #ifdef __KERNEL__ 253 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 254 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 255 #else 256 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 257 #endif 258 #ifdef __KERNEL__ 259 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 260 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 261 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 262 #else 263 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 264 EXT4_GOOD_OLD_INODE_SIZE : \ 265 (s)->s_inode_size) 266 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 267 EXT4_GOOD_OLD_FIRST_INO : \ 268 (s)->s_first_ino) 269 #endif 270 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 271 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \ 272 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \ 273 blkbits)) 274 275 /* Translate a block number to a cluster number */ 276 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 277 /* Translate a cluster number to a block number */ 278 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 279 /* Translate # of blks to # of clusters */ 280 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 281 (sbi)->s_cluster_bits) 282 /* Mask out the low bits to get the starting block of the cluster */ 283 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 284 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 285 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 286 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 287 /* Get the cluster offset */ 288 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 289 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 290 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 291 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 292 293 /* 294 * Structure of a blocks group descriptor 295 */ 296 struct ext4_group_desc 297 { 298 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 299 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 300 __le32 bg_inode_table_lo; /* Inodes table block */ 301 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 302 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 303 __le16 bg_used_dirs_count_lo; /* Directories count */ 304 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 305 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 306 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 307 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 308 __le16 bg_itable_unused_lo; /* Unused inodes count */ 309 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 310 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 311 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 312 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 313 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 314 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 315 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 316 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 317 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 318 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 319 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 320 __u32 bg_reserved; 321 }; 322 323 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 324 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 325 sizeof(__le16)) 326 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 327 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 328 sizeof(__le16)) 329 330 /* 331 * Structure of a flex block group info 332 */ 333 334 struct flex_groups { 335 atomic64_t free_clusters; 336 atomic_t free_inodes; 337 atomic_t used_dirs; 338 }; 339 340 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 341 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 342 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 343 344 /* 345 * Macro-instructions used to manage group descriptors 346 */ 347 #define EXT4_MIN_DESC_SIZE 32 348 #define EXT4_MIN_DESC_SIZE_64BIT 64 349 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 350 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 351 #ifdef __KERNEL__ 352 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 353 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 354 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 355 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 356 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 357 #else 358 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 359 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 360 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 361 #endif 362 363 /* 364 * Constants relative to the data blocks 365 */ 366 #define EXT4_NDIR_BLOCKS 12 367 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 368 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 369 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 370 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 371 372 /* 373 * Inode flags 374 */ 375 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 376 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 377 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 378 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 379 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 380 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 381 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 382 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 383 /* Reserved for compression usage... */ 384 #define EXT4_DIRTY_FL 0x00000100 385 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 386 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 387 /* nb: was previously EXT2_ECOMPR_FL */ 388 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 389 /* End compression flags --- maybe not all used */ 390 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 391 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 392 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 393 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 394 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 395 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 396 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 397 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 398 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 399 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 400 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 401 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 402 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 403 404 #define EXT4_FL_USER_VISIBLE 0x304BDFFF /* User visible flags */ 405 #define EXT4_FL_USER_MODIFIABLE 0x204BC0FF /* User modifiable flags */ 406 407 /* Flags we can manipulate with through EXT4_IOC_FSSETXATTR */ 408 #define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \ 409 EXT4_IMMUTABLE_FL | \ 410 EXT4_APPEND_FL | \ 411 EXT4_NODUMP_FL | \ 412 EXT4_NOATIME_FL | \ 413 EXT4_PROJINHERIT_FL) 414 415 /* Flags that should be inherited by new inodes from their parent. */ 416 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 417 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 418 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 419 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 420 EXT4_PROJINHERIT_FL) 421 422 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 423 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 424 425 /* Flags that are appropriate for non-directories/regular files. */ 426 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 427 428 /* Mask out flags that are inappropriate for the given type of inode. */ 429 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 430 { 431 if (S_ISDIR(mode)) 432 return flags; 433 else if (S_ISREG(mode)) 434 return flags & EXT4_REG_FLMASK; 435 else 436 return flags & EXT4_OTHER_FLMASK; 437 } 438 439 /* 440 * Inode flags used for atomic set/get 441 */ 442 enum { 443 EXT4_INODE_SECRM = 0, /* Secure deletion */ 444 EXT4_INODE_UNRM = 1, /* Undelete */ 445 EXT4_INODE_COMPR = 2, /* Compress file */ 446 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 447 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 448 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 449 EXT4_INODE_NODUMP = 6, /* do not dump file */ 450 EXT4_INODE_NOATIME = 7, /* do not update atime */ 451 /* Reserved for compression usage... */ 452 EXT4_INODE_DIRTY = 8, 453 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 454 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 455 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 456 /* End compression flags --- maybe not all used */ 457 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 458 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 459 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 460 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 461 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 462 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 463 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 464 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 465 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 466 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 467 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 468 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 469 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 470 }; 471 472 /* 473 * Since it's pretty easy to mix up bit numbers and hex values, we use a 474 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 475 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 476 * any extra space in the compiled kernel image, otherwise, the build will fail. 477 * It's important that these values are the same, since we are using 478 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 479 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 480 * values found in ext2, ext3 and ext4 filesystems, and of course the values 481 * defined in e2fsprogs. 482 * 483 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 484 */ 485 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 486 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 487 488 static inline void ext4_check_flag_values(void) 489 { 490 CHECK_FLAG_VALUE(SECRM); 491 CHECK_FLAG_VALUE(UNRM); 492 CHECK_FLAG_VALUE(COMPR); 493 CHECK_FLAG_VALUE(SYNC); 494 CHECK_FLAG_VALUE(IMMUTABLE); 495 CHECK_FLAG_VALUE(APPEND); 496 CHECK_FLAG_VALUE(NODUMP); 497 CHECK_FLAG_VALUE(NOATIME); 498 CHECK_FLAG_VALUE(DIRTY); 499 CHECK_FLAG_VALUE(COMPRBLK); 500 CHECK_FLAG_VALUE(NOCOMPR); 501 CHECK_FLAG_VALUE(ENCRYPT); 502 CHECK_FLAG_VALUE(INDEX); 503 CHECK_FLAG_VALUE(IMAGIC); 504 CHECK_FLAG_VALUE(JOURNAL_DATA); 505 CHECK_FLAG_VALUE(NOTAIL); 506 CHECK_FLAG_VALUE(DIRSYNC); 507 CHECK_FLAG_VALUE(TOPDIR); 508 CHECK_FLAG_VALUE(HUGE_FILE); 509 CHECK_FLAG_VALUE(EXTENTS); 510 CHECK_FLAG_VALUE(EA_INODE); 511 CHECK_FLAG_VALUE(EOFBLOCKS); 512 CHECK_FLAG_VALUE(INLINE_DATA); 513 CHECK_FLAG_VALUE(PROJINHERIT); 514 CHECK_FLAG_VALUE(RESERVED); 515 } 516 517 /* Used to pass group descriptor data when online resize is done */ 518 struct ext4_new_group_input { 519 __u32 group; /* Group number for this data */ 520 __u64 block_bitmap; /* Absolute block number of block bitmap */ 521 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 522 __u64 inode_table; /* Absolute block number of inode table start */ 523 __u32 blocks_count; /* Total number of blocks in this group */ 524 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 525 __u16 unused; 526 }; 527 528 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 529 struct compat_ext4_new_group_input { 530 u32 group; 531 compat_u64 block_bitmap; 532 compat_u64 inode_bitmap; 533 compat_u64 inode_table; 534 u32 blocks_count; 535 u16 reserved_blocks; 536 u16 unused; 537 }; 538 #endif 539 540 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 541 struct ext4_new_group_data { 542 __u32 group; 543 __u64 block_bitmap; 544 __u64 inode_bitmap; 545 __u64 inode_table; 546 __u32 blocks_count; 547 __u16 reserved_blocks; 548 __u16 unused; 549 __u32 free_blocks_count; 550 }; 551 552 /* Indexes used to index group tables in ext4_new_group_data */ 553 enum { 554 BLOCK_BITMAP = 0, /* block bitmap */ 555 INODE_BITMAP, /* inode bitmap */ 556 INODE_TABLE, /* inode tables */ 557 GROUP_TABLE_COUNT, 558 }; 559 560 /* 561 * Flags used by ext4_map_blocks() 562 */ 563 /* Allocate any needed blocks and/or convert an unwritten 564 extent to be an initialized ext4 */ 565 #define EXT4_GET_BLOCKS_CREATE 0x0001 566 /* Request the creation of an unwritten extent */ 567 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 568 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 569 EXT4_GET_BLOCKS_CREATE) 570 /* Caller is from the delayed allocation writeout path 571 * finally doing the actual allocation of delayed blocks */ 572 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 573 /* caller is from the direct IO path, request to creation of an 574 unwritten extents if not allocated, split the unwritten 575 extent if blocks has been preallocated already*/ 576 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 577 #define EXT4_GET_BLOCKS_CONVERT 0x0010 578 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 579 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 580 /* Convert extent to initialized after IO complete */ 581 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 582 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 583 /* Eventual metadata allocation (due to growing extent tree) 584 * should not fail, so try to use reserved blocks for that.*/ 585 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 586 /* Don't normalize allocation size (used for fallocate) */ 587 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 588 /* Request will not result in inode size update (user for fallocate) */ 589 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 590 /* Convert written extents to unwritten */ 591 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 592 /* Write zeros to newly created written extents */ 593 #define EXT4_GET_BLOCKS_ZERO 0x0200 594 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 595 EXT4_GET_BLOCKS_ZERO) 596 /* Caller will submit data before dropping transaction handle. This 597 * allows jbd2 to avoid submitting data before commit. */ 598 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 599 600 /* 601 * The bit position of these flags must not overlap with any of the 602 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 603 * read_extent_tree_block(), ext4_split_extent_at(), 604 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 605 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 606 * caching the extents when reading from the extent tree while a 607 * truncate or punch hole operation is in progress. 608 */ 609 #define EXT4_EX_NOCACHE 0x40000000 610 #define EXT4_EX_FORCE_CACHE 0x20000000 611 612 /* 613 * Flags used by ext4_free_blocks 614 */ 615 #define EXT4_FREE_BLOCKS_METADATA 0x0001 616 #define EXT4_FREE_BLOCKS_FORGET 0x0002 617 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 618 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 619 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 620 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 621 622 /* 623 * ioctl commands 624 */ 625 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 626 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 627 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 628 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 629 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 630 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 631 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 632 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 633 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 634 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 635 #define EXT4_IOC_MIGRATE _IO('f', 9) 636 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 637 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 638 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 639 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 640 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 641 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 642 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 643 #define EXT4_IOC_SET_ENCRYPTION_POLICY FS_IOC_SET_ENCRYPTION_POLICY 644 #define EXT4_IOC_GET_ENCRYPTION_PWSALT FS_IOC_GET_ENCRYPTION_PWSALT 645 #define EXT4_IOC_GET_ENCRYPTION_POLICY FS_IOC_GET_ENCRYPTION_POLICY 646 647 #ifndef FS_IOC_FSGETXATTR 648 /* Until the uapi changes get merged for project quota... */ 649 650 #define FS_IOC_FSGETXATTR _IOR('X', 31, struct fsxattr) 651 #define FS_IOC_FSSETXATTR _IOW('X', 32, struct fsxattr) 652 653 /* 654 * Structure for FS_IOC_FSGETXATTR and FS_IOC_FSSETXATTR. 655 */ 656 struct fsxattr { 657 __u32 fsx_xflags; /* xflags field value (get/set) */ 658 __u32 fsx_extsize; /* extsize field value (get/set)*/ 659 __u32 fsx_nextents; /* nextents field value (get) */ 660 __u32 fsx_projid; /* project identifier (get/set) */ 661 unsigned char fsx_pad[12]; 662 }; 663 664 /* 665 * Flags for the fsx_xflags field 666 */ 667 #define FS_XFLAG_REALTIME 0x00000001 /* data in realtime volume */ 668 #define FS_XFLAG_PREALLOC 0x00000002 /* preallocated file extents */ 669 #define FS_XFLAG_IMMUTABLE 0x00000008 /* file cannot be modified */ 670 #define FS_XFLAG_APPEND 0x00000010 /* all writes append */ 671 #define FS_XFLAG_SYNC 0x00000020 /* all writes synchronous */ 672 #define FS_XFLAG_NOATIME 0x00000040 /* do not update access time */ 673 #define FS_XFLAG_NODUMP 0x00000080 /* do not include in backups */ 674 #define FS_XFLAG_RTINHERIT 0x00000100 /* create with rt bit set */ 675 #define FS_XFLAG_PROJINHERIT 0x00000200 /* create with parents projid */ 676 #define FS_XFLAG_NOSYMLINKS 0x00000400 /* disallow symlink creation */ 677 #define FS_XFLAG_EXTSIZE 0x00000800 /* extent size allocator hint */ 678 #define FS_XFLAG_EXTSZINHERIT 0x00001000 /* inherit inode extent size */ 679 #define FS_XFLAG_NODEFRAG 0x00002000 /* do not defragment */ 680 #define FS_XFLAG_FILESTREAM 0x00004000 /* use filestream allocator */ 681 #define FS_XFLAG_HASATTR 0x80000000 /* no DIFLAG for this */ 682 #endif /* !defined(FS_IOC_FSGETXATTR) */ 683 684 #define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR 685 #define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR 686 687 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32) 688 689 /* 690 * Flags for going down operation 691 */ 692 #define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */ 693 #define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */ 694 #define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */ 695 696 697 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 698 /* 699 * ioctl commands in 32 bit emulation 700 */ 701 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 702 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 703 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 704 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 705 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 706 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 707 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 708 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 709 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 710 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 711 #endif 712 713 /* Max physical block we can address w/o extents */ 714 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 715 716 /* 717 * Structure of an inode on the disk 718 */ 719 struct ext4_inode { 720 __le16 i_mode; /* File mode */ 721 __le16 i_uid; /* Low 16 bits of Owner Uid */ 722 __le32 i_size_lo; /* Size in bytes */ 723 __le32 i_atime; /* Access time */ 724 __le32 i_ctime; /* Inode Change time */ 725 __le32 i_mtime; /* Modification time */ 726 __le32 i_dtime; /* Deletion Time */ 727 __le16 i_gid; /* Low 16 bits of Group Id */ 728 __le16 i_links_count; /* Links count */ 729 __le32 i_blocks_lo; /* Blocks count */ 730 __le32 i_flags; /* File flags */ 731 union { 732 struct { 733 __le32 l_i_version; 734 } linux1; 735 struct { 736 __u32 h_i_translator; 737 } hurd1; 738 struct { 739 __u32 m_i_reserved1; 740 } masix1; 741 } osd1; /* OS dependent 1 */ 742 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 743 __le32 i_generation; /* File version (for NFS) */ 744 __le32 i_file_acl_lo; /* File ACL */ 745 __le32 i_size_high; 746 __le32 i_obso_faddr; /* Obsoleted fragment address */ 747 union { 748 struct { 749 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 750 __le16 l_i_file_acl_high; 751 __le16 l_i_uid_high; /* these 2 fields */ 752 __le16 l_i_gid_high; /* were reserved2[0] */ 753 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 754 __le16 l_i_reserved; 755 } linux2; 756 struct { 757 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 758 __u16 h_i_mode_high; 759 __u16 h_i_uid_high; 760 __u16 h_i_gid_high; 761 __u32 h_i_author; 762 } hurd2; 763 struct { 764 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 765 __le16 m_i_file_acl_high; 766 __u32 m_i_reserved2[2]; 767 } masix2; 768 } osd2; /* OS dependent 2 */ 769 __le16 i_extra_isize; 770 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 771 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 772 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 773 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 774 __le32 i_crtime; /* File Creation time */ 775 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 776 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 777 __le32 i_projid; /* Project ID */ 778 }; 779 780 struct move_extent { 781 __u32 reserved; /* should be zero */ 782 __u32 donor_fd; /* donor file descriptor */ 783 __u64 orig_start; /* logical start offset in block for orig */ 784 __u64 donor_start; /* logical start offset in block for donor */ 785 __u64 len; /* block length to be moved */ 786 __u64 moved_len; /* moved block length */ 787 }; 788 789 #define EXT4_EPOCH_BITS 2 790 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 791 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 792 793 /* 794 * Extended fields will fit into an inode if the filesystem was formatted 795 * with large inodes (-I 256 or larger) and there are not currently any EAs 796 * consuming all of the available space. For new inodes we always reserve 797 * enough space for the kernel's known extended fields, but for inodes 798 * created with an old kernel this might not have been the case. None of 799 * the extended inode fields is critical for correct filesystem operation. 800 * This macro checks if a certain field fits in the inode. Note that 801 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 802 */ 803 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 804 ((offsetof(typeof(*ext4_inode), field) + \ 805 sizeof((ext4_inode)->field)) \ 806 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 807 (einode)->i_extra_isize)) \ 808 809 /* 810 * We use an encoding that preserves the times for extra epoch "00": 811 * 812 * extra msb of adjust for signed 813 * epoch 32-bit 32-bit tv_sec to 814 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 815 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 816 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 817 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 818 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 819 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 820 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 821 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 822 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 823 * 824 * Note that previous versions of the kernel on 64-bit systems would 825 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 826 * 1970. e2fsck will correct this, assuming that it is run on the 827 * affected filesystem before 2242. 828 */ 829 830 static inline __le32 ext4_encode_extra_time(struct timespec *time) 831 { 832 u32 extra = sizeof(time->tv_sec) > 4 ? 833 ((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK : 0; 834 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); 835 } 836 837 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 838 { 839 if (unlikely(sizeof(time->tv_sec) > 4 && 840 (extra & cpu_to_le32(EXT4_EPOCH_MASK)))) { 841 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,20,0) 842 /* Handle legacy encoding of pre-1970 dates with epoch 843 * bits 1,1. We assume that by kernel version 4.20, 844 * everyone will have run fsck over the affected 845 * filesystems to correct the problem. (This 846 * backwards compatibility may be removed before this 847 * time, at the discretion of the ext4 developers.) 848 */ 849 u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK; 850 if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0) 851 extra_bits = 0; 852 time->tv_sec += extra_bits << 32; 853 #else 854 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 855 #endif 856 } 857 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 858 } 859 860 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 861 do { \ 862 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 863 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 864 (raw_inode)->xtime ## _extra = \ 865 ext4_encode_extra_time(&(inode)->xtime); \ 866 } while (0) 867 868 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 869 do { \ 870 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 871 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 872 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 873 (raw_inode)->xtime ## _extra = \ 874 ext4_encode_extra_time(&(einode)->xtime); \ 875 } while (0) 876 877 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 878 do { \ 879 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 880 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 881 ext4_decode_extra_time(&(inode)->xtime, \ 882 raw_inode->xtime ## _extra); \ 883 else \ 884 (inode)->xtime.tv_nsec = 0; \ 885 } while (0) 886 887 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 888 do { \ 889 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 890 (einode)->xtime.tv_sec = \ 891 (signed)le32_to_cpu((raw_inode)->xtime); \ 892 else \ 893 (einode)->xtime.tv_sec = 0; \ 894 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 895 ext4_decode_extra_time(&(einode)->xtime, \ 896 raw_inode->xtime ## _extra); \ 897 else \ 898 (einode)->xtime.tv_nsec = 0; \ 899 } while (0) 900 901 #define i_disk_version osd1.linux1.l_i_version 902 903 #if defined(__KERNEL__) || defined(__linux__) 904 #define i_reserved1 osd1.linux1.l_i_reserved1 905 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 906 #define i_blocks_high osd2.linux2.l_i_blocks_high 907 #define i_uid_low i_uid 908 #define i_gid_low i_gid 909 #define i_uid_high osd2.linux2.l_i_uid_high 910 #define i_gid_high osd2.linux2.l_i_gid_high 911 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 912 913 #elif defined(__GNU__) 914 915 #define i_translator osd1.hurd1.h_i_translator 916 #define i_uid_high osd2.hurd2.h_i_uid_high 917 #define i_gid_high osd2.hurd2.h_i_gid_high 918 #define i_author osd2.hurd2.h_i_author 919 920 #elif defined(__masix__) 921 922 #define i_reserved1 osd1.masix1.m_i_reserved1 923 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 924 #define i_reserved2 osd2.masix2.m_i_reserved2 925 926 #endif /* defined(__KERNEL__) || defined(__linux__) */ 927 928 #include "extents_status.h" 929 930 /* 931 * Lock subclasses for i_data_sem in the ext4_inode_info structure. 932 * 933 * These are needed to avoid lockdep false positives when we need to 934 * allocate blocks to the quota inode during ext4_map_blocks(), while 935 * holding i_data_sem for a normal (non-quota) inode. Since we don't 936 * do quota tracking for the quota inode, this avoids deadlock (as 937 * well as infinite recursion, since it isn't turtles all the way 938 * down...) 939 * 940 * I_DATA_SEM_NORMAL - Used for most inodes 941 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode 942 * where the second inode has larger inode number 943 * than the first 944 * I_DATA_SEM_QUOTA - Used for quota inodes only 945 */ 946 enum { 947 I_DATA_SEM_NORMAL = 0, 948 I_DATA_SEM_OTHER, 949 I_DATA_SEM_QUOTA, 950 }; 951 952 953 /* 954 * fourth extended file system inode data in memory 955 */ 956 struct ext4_inode_info { 957 __le32 i_data[15]; /* unconverted */ 958 __u32 i_dtime; 959 ext4_fsblk_t i_file_acl; 960 961 /* 962 * i_block_group is the number of the block group which contains 963 * this file's inode. Constant across the lifetime of the inode, 964 * it is ued for making block allocation decisions - we try to 965 * place a file's data blocks near its inode block, and new inodes 966 * near to their parent directory's inode. 967 */ 968 ext4_group_t i_block_group; 969 ext4_lblk_t i_dir_start_lookup; 970 #if (BITS_PER_LONG < 64) 971 unsigned long i_state_flags; /* Dynamic state flags */ 972 #endif 973 unsigned long i_flags; 974 975 /* 976 * Extended attributes can be read independently of the main file 977 * data. Taking i_mutex even when reading would cause contention 978 * between readers of EAs and writers of regular file data, so 979 * instead we synchronize on xattr_sem when reading or changing 980 * EAs. 981 */ 982 struct rw_semaphore xattr_sem; 983 984 struct list_head i_orphan; /* unlinked but open inodes */ 985 986 /* 987 * i_disksize keeps track of what the inode size is ON DISK, not 988 * in memory. During truncate, i_size is set to the new size by 989 * the VFS prior to calling ext4_truncate(), but the filesystem won't 990 * set i_disksize to 0 until the truncate is actually under way. 991 * 992 * The intent is that i_disksize always represents the blocks which 993 * are used by this file. This allows recovery to restart truncate 994 * on orphans if we crash during truncate. We actually write i_disksize 995 * into the on-disk inode when writing inodes out, instead of i_size. 996 * 997 * The only time when i_disksize and i_size may be different is when 998 * a truncate is in progress. The only things which change i_disksize 999 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 1000 */ 1001 loff_t i_disksize; 1002 1003 /* 1004 * i_data_sem is for serialising ext4_truncate() against 1005 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 1006 * data tree are chopped off during truncate. We can't do that in 1007 * ext4 because whenever we perform intermediate commits during 1008 * truncate, the inode and all the metadata blocks *must* be in a 1009 * consistent state which allows truncation of the orphans to restart 1010 * during recovery. Hence we must fix the get_block-vs-truncate race 1011 * by other means, so we have i_data_sem. 1012 */ 1013 struct rw_semaphore i_data_sem; 1014 /* 1015 * i_mmap_sem is for serializing page faults with truncate / punch hole 1016 * operations. We have to make sure that new page cannot be faulted in 1017 * a section of the inode that is being punched. We cannot easily use 1018 * i_data_sem for this since we need protection for the whole punch 1019 * operation and i_data_sem ranks below transaction start so we have 1020 * to occasionally drop it. 1021 */ 1022 struct rw_semaphore i_mmap_sem; 1023 struct inode vfs_inode; 1024 struct jbd2_inode *jinode; 1025 1026 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 1027 1028 /* 1029 * File creation time. Its function is same as that of 1030 * struct timespec i_{a,c,m}time in the generic inode. 1031 */ 1032 struct timespec i_crtime; 1033 1034 /* mballoc */ 1035 struct list_head i_prealloc_list; 1036 spinlock_t i_prealloc_lock; 1037 1038 /* extents status tree */ 1039 struct ext4_es_tree i_es_tree; 1040 rwlock_t i_es_lock; 1041 struct list_head i_es_list; 1042 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1043 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1044 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1045 extents to shrink. Protected by 1046 i_es_lock */ 1047 1048 /* ialloc */ 1049 ext4_group_t i_last_alloc_group; 1050 1051 /* allocation reservation info for delalloc */ 1052 /* In case of bigalloc, these refer to clusters rather than blocks */ 1053 unsigned int i_reserved_data_blocks; 1054 unsigned int i_reserved_meta_blocks; 1055 unsigned int i_allocated_meta_blocks; 1056 ext4_lblk_t i_da_metadata_calc_last_lblock; 1057 int i_da_metadata_calc_len; 1058 1059 /* on-disk additional length */ 1060 __u16 i_extra_isize; 1061 1062 /* Indicate the inline data space. */ 1063 u16 i_inline_off; 1064 u16 i_inline_size; 1065 1066 #ifdef CONFIG_QUOTA 1067 /* quota space reservation, managed internally by quota code */ 1068 qsize_t i_reserved_quota; 1069 #endif 1070 1071 /* Lock protecting lists below */ 1072 spinlock_t i_completed_io_lock; 1073 /* 1074 * Completed IOs that need unwritten extents handling and have 1075 * transaction reserved 1076 */ 1077 struct list_head i_rsv_conversion_list; 1078 struct work_struct i_rsv_conversion_work; 1079 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 1080 1081 spinlock_t i_block_reservation_lock; 1082 1083 /* 1084 * Transactions that contain inode's metadata needed to complete 1085 * fsync and fdatasync, respectively. 1086 */ 1087 tid_t i_sync_tid; 1088 tid_t i_datasync_tid; 1089 1090 #ifdef CONFIG_QUOTA 1091 struct dquot *i_dquot[MAXQUOTAS]; 1092 #endif 1093 1094 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1095 __u32 i_csum_seed; 1096 1097 kprojid_t i_projid; 1098 }; 1099 1100 /* 1101 * File system states 1102 */ 1103 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1104 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1105 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1106 1107 /* 1108 * Misc. filesystem flags 1109 */ 1110 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1111 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1112 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1113 1114 /* 1115 * Mount flags set via mount options or defaults 1116 */ 1117 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1118 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1119 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1120 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1121 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1122 #define EXT4_MOUNT_ERRORS_MASK 0x00070 1123 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1124 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1125 #ifdef CONFIG_FS_DAX 1126 #define EXT4_MOUNT_DAX 0x00200 /* Direct Access */ 1127 #else 1128 #define EXT4_MOUNT_DAX 0 1129 #endif 1130 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1131 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1132 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1133 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1134 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1135 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1136 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1137 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1138 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1139 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1140 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */ 1141 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota, 1142 * enable enforcement for hidden 1143 * quota files */ 1144 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable 1145 * enforcement for hidden quota 1146 * files */ 1147 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota 1148 * enforcement */ 1149 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1150 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1151 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1152 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1153 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1154 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1155 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1156 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1157 1158 /* 1159 * Mount flags set either automatically (could not be set by mount option) 1160 * based on per file system feature or property or in special cases such as 1161 * distinguishing between explicit mount option definition and default. 1162 */ 1163 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1164 specified delalloc */ 1165 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1166 size of blocksize * 8 1167 blocks */ 1168 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1169 file systems */ 1170 1171 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1172 specified journal checksum */ 1173 1174 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1175 ~EXT4_MOUNT_##opt 1176 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1177 EXT4_MOUNT_##opt 1178 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1179 EXT4_MOUNT_##opt) 1180 1181 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1182 ~EXT4_MOUNT2_##opt 1183 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1184 EXT4_MOUNT2_##opt 1185 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1186 EXT4_MOUNT2_##opt) 1187 1188 #define ext4_test_and_set_bit __test_and_set_bit_le 1189 #define ext4_set_bit __set_bit_le 1190 #define ext4_set_bit_atomic ext2_set_bit_atomic 1191 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1192 #define ext4_clear_bit __clear_bit_le 1193 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1194 #define ext4_test_bit test_bit_le 1195 #define ext4_find_next_zero_bit find_next_zero_bit_le 1196 #define ext4_find_next_bit find_next_bit_le 1197 1198 extern void ext4_set_bits(void *bm, int cur, int len); 1199 1200 /* 1201 * Maximal mount counts between two filesystem checks 1202 */ 1203 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1204 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1205 1206 /* 1207 * Behaviour when detecting errors 1208 */ 1209 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1210 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1211 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1212 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1213 1214 /* Metadata checksum algorithm codes */ 1215 #define EXT4_CRC32C_CHKSUM 1 1216 1217 /* 1218 * Structure of the super block 1219 */ 1220 struct ext4_super_block { 1221 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1222 __le32 s_blocks_count_lo; /* Blocks count */ 1223 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1224 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1225 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1226 __le32 s_first_data_block; /* First Data Block */ 1227 __le32 s_log_block_size; /* Block size */ 1228 __le32 s_log_cluster_size; /* Allocation cluster size */ 1229 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1230 __le32 s_clusters_per_group; /* # Clusters per group */ 1231 __le32 s_inodes_per_group; /* # Inodes per group */ 1232 __le32 s_mtime; /* Mount time */ 1233 /*30*/ __le32 s_wtime; /* Write time */ 1234 __le16 s_mnt_count; /* Mount count */ 1235 __le16 s_max_mnt_count; /* Maximal mount count */ 1236 __le16 s_magic; /* Magic signature */ 1237 __le16 s_state; /* File system state */ 1238 __le16 s_errors; /* Behaviour when detecting errors */ 1239 __le16 s_minor_rev_level; /* minor revision level */ 1240 /*40*/ __le32 s_lastcheck; /* time of last check */ 1241 __le32 s_checkinterval; /* max. time between checks */ 1242 __le32 s_creator_os; /* OS */ 1243 __le32 s_rev_level; /* Revision level */ 1244 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1245 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1246 /* 1247 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1248 * 1249 * Note: the difference between the compatible feature set and 1250 * the incompatible feature set is that if there is a bit set 1251 * in the incompatible feature set that the kernel doesn't 1252 * know about, it should refuse to mount the filesystem. 1253 * 1254 * e2fsck's requirements are more strict; if it doesn't know 1255 * about a feature in either the compatible or incompatible 1256 * feature set, it must abort and not try to meddle with 1257 * things it doesn't understand... 1258 */ 1259 __le32 s_first_ino; /* First non-reserved inode */ 1260 __le16 s_inode_size; /* size of inode structure */ 1261 __le16 s_block_group_nr; /* block group # of this superblock */ 1262 __le32 s_feature_compat; /* compatible feature set */ 1263 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1264 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1265 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1266 /*78*/ char s_volume_name[16]; /* volume name */ 1267 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 1268 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1269 /* 1270 * Performance hints. Directory preallocation should only 1271 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1272 */ 1273 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1274 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1275 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1276 /* 1277 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1278 */ 1279 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1280 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1281 __le32 s_journal_dev; /* device number of journal file */ 1282 __le32 s_last_orphan; /* start of list of inodes to delete */ 1283 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1284 __u8 s_def_hash_version; /* Default hash version to use */ 1285 __u8 s_jnl_backup_type; 1286 __le16 s_desc_size; /* size of group descriptor */ 1287 /*100*/ __le32 s_default_mount_opts; 1288 __le32 s_first_meta_bg; /* First metablock block group */ 1289 __le32 s_mkfs_time; /* When the filesystem was created */ 1290 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1291 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1292 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1293 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1294 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1295 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1296 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1297 __le32 s_flags; /* Miscellaneous flags */ 1298 __le16 s_raid_stride; /* RAID stride */ 1299 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1300 __le64 s_mmp_block; /* Block for multi-mount protection */ 1301 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1302 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1303 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1304 __u8 s_encryption_level; /* versioning level for encryption */ 1305 __u8 s_reserved_pad; /* Padding to next 32bits */ 1306 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1307 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1308 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1309 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1310 snapshot's future use */ 1311 __le32 s_snapshot_list; /* inode number of the head of the 1312 on-disk snapshot list */ 1313 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1314 __le32 s_error_count; /* number of fs errors */ 1315 __le32 s_first_error_time; /* first time an error happened */ 1316 __le32 s_first_error_ino; /* inode involved in first error */ 1317 __le64 s_first_error_block; /* block involved of first error */ 1318 __u8 s_first_error_func[32]; /* function where the error happened */ 1319 __le32 s_first_error_line; /* line number where error happened */ 1320 __le32 s_last_error_time; /* most recent time of an error */ 1321 __le32 s_last_error_ino; /* inode involved in last error */ 1322 __le32 s_last_error_line; /* line number where error happened */ 1323 __le64 s_last_error_block; /* block involved of last error */ 1324 __u8 s_last_error_func[32]; /* function where the error happened */ 1325 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1326 __u8 s_mount_opts[64]; 1327 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1328 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1329 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1330 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1331 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1332 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1333 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1334 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1335 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1336 __le32 s_reserved[98]; /* Padding to the end of the block */ 1337 __le32 s_checksum; /* crc32c(superblock) */ 1338 }; 1339 1340 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1341 1342 #ifdef __KERNEL__ 1343 1344 /* 1345 * run-time mount flags 1346 */ 1347 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1348 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1349 #define EXT4_MF_TEST_DUMMY_ENCRYPTION 0x0004 1350 1351 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1352 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \ 1353 EXT4_MF_TEST_DUMMY_ENCRYPTION)) 1354 #else 1355 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0) 1356 #endif 1357 1358 /* Number of quota types we support */ 1359 #define EXT4_MAXQUOTAS 3 1360 1361 /* 1362 * fourth extended-fs super-block data in memory 1363 */ 1364 struct ext4_sb_info { 1365 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1366 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1367 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1368 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1369 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1370 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1371 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1372 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1373 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1374 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1375 unsigned long s_overhead; /* # of fs overhead clusters */ 1376 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1377 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1378 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1379 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1380 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1381 struct buffer_head **s_group_desc; 1382 unsigned int s_mount_opt; 1383 unsigned int s_mount_opt2; 1384 unsigned int s_mount_flags; 1385 unsigned int s_def_mount_opt; 1386 ext4_fsblk_t s_sb_block; 1387 atomic64_t s_resv_clusters; 1388 kuid_t s_resuid; 1389 kgid_t s_resgid; 1390 unsigned short s_mount_state; 1391 unsigned short s_pad; 1392 int s_addr_per_block_bits; 1393 int s_desc_per_block_bits; 1394 int s_inode_size; 1395 int s_first_ino; 1396 unsigned int s_inode_readahead_blks; 1397 unsigned int s_inode_goal; 1398 spinlock_t s_next_gen_lock; 1399 u32 s_next_generation; 1400 u32 s_hash_seed[4]; 1401 int s_def_hash_version; 1402 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1403 struct percpu_counter s_freeclusters_counter; 1404 struct percpu_counter s_freeinodes_counter; 1405 struct percpu_counter s_dirs_counter; 1406 struct percpu_counter s_dirtyclusters_counter; 1407 struct blockgroup_lock *s_blockgroup_lock; 1408 struct proc_dir_entry *s_proc; 1409 struct kobject s_kobj; 1410 struct completion s_kobj_unregister; 1411 struct super_block *s_sb; 1412 1413 /* Journaling */ 1414 struct journal_s *s_journal; 1415 struct list_head s_orphan; 1416 struct mutex s_orphan_lock; 1417 unsigned long s_ext4_flags; /* Ext4 superblock flags */ 1418 unsigned long s_commit_interval; 1419 u32 s_max_batch_time; 1420 u32 s_min_batch_time; 1421 struct block_device *journal_bdev; 1422 #ifdef CONFIG_QUOTA 1423 char *s_qf_names[EXT4_MAXQUOTAS]; /* Names of quota files with journalled quota */ 1424 int s_jquota_fmt; /* Format of quota to use */ 1425 #endif 1426 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1427 struct rb_root system_blks; 1428 1429 #ifdef EXTENTS_STATS 1430 /* ext4 extents stats */ 1431 unsigned long s_ext_min; 1432 unsigned long s_ext_max; 1433 unsigned long s_depth_max; 1434 spinlock_t s_ext_stats_lock; 1435 unsigned long s_ext_blocks; 1436 unsigned long s_ext_extents; 1437 #endif 1438 1439 /* for buddy allocator */ 1440 struct ext4_group_info ***s_group_info; 1441 struct inode *s_buddy_cache; 1442 spinlock_t s_md_lock; 1443 unsigned short *s_mb_offsets; 1444 unsigned int *s_mb_maxs; 1445 unsigned int s_group_info_size; 1446 unsigned int s_mb_free_pending; 1447 1448 /* tunables */ 1449 unsigned long s_stripe; 1450 unsigned int s_mb_stream_request; 1451 unsigned int s_mb_max_to_scan; 1452 unsigned int s_mb_min_to_scan; 1453 unsigned int s_mb_stats; 1454 unsigned int s_mb_order2_reqs; 1455 unsigned int s_mb_group_prealloc; 1456 unsigned int s_max_dir_size_kb; 1457 /* where last allocation was done - for stream allocation */ 1458 unsigned long s_mb_last_group; 1459 unsigned long s_mb_last_start; 1460 1461 /* stats for buddy allocator */ 1462 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1463 atomic_t s_bal_success; /* we found long enough chunks */ 1464 atomic_t s_bal_allocated; /* in blocks */ 1465 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1466 atomic_t s_bal_goals; /* goal hits */ 1467 atomic_t s_bal_breaks; /* too long searches */ 1468 atomic_t s_bal_2orders; /* 2^order hits */ 1469 spinlock_t s_bal_lock; 1470 unsigned long s_mb_buddies_generated; 1471 unsigned long long s_mb_generation_time; 1472 atomic_t s_mb_lost_chunks; 1473 atomic_t s_mb_preallocated; 1474 atomic_t s_mb_discarded; 1475 atomic_t s_lock_busy; 1476 1477 /* locality groups */ 1478 struct ext4_locality_group __percpu *s_locality_groups; 1479 1480 /* for write statistics */ 1481 unsigned long s_sectors_written_start; 1482 u64 s_kbytes_written; 1483 1484 /* the size of zero-out chunk */ 1485 unsigned int s_extent_max_zeroout_kb; 1486 1487 unsigned int s_log_groups_per_flex; 1488 struct flex_groups *s_flex_groups; 1489 ext4_group_t s_flex_groups_allocated; 1490 1491 /* workqueue for reserved extent conversions (buffered io) */ 1492 struct workqueue_struct *rsv_conversion_wq; 1493 1494 /* timer for periodic error stats printing */ 1495 struct timer_list s_err_report; 1496 1497 /* Lazy inode table initialization info */ 1498 struct ext4_li_request *s_li_request; 1499 /* Wait multiplier for lazy initialization thread */ 1500 unsigned int s_li_wait_mult; 1501 1502 /* Kernel thread for multiple mount protection */ 1503 struct task_struct *s_mmp_tsk; 1504 1505 /* record the last minlen when FITRIM is called. */ 1506 atomic_t s_last_trim_minblks; 1507 1508 /* Reference to checksum algorithm driver via cryptoapi */ 1509 struct crypto_shash *s_chksum_driver; 1510 1511 /* Precomputed FS UUID checksum for seeding other checksums */ 1512 __u32 s_csum_seed; 1513 1514 /* Reclaim extents from extent status tree */ 1515 struct shrinker s_es_shrinker; 1516 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1517 long s_es_nr_inode; 1518 struct ext4_es_stats s_es_stats; 1519 struct mb_cache *s_mb_cache; 1520 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1521 1522 /* Ratelimit ext4 messages. */ 1523 struct ratelimit_state s_err_ratelimit_state; 1524 struct ratelimit_state s_warning_ratelimit_state; 1525 struct ratelimit_state s_msg_ratelimit_state; 1526 1527 /* Barrier between changing inodes' journal flags and writepages ops. */ 1528 struct percpu_rw_semaphore s_journal_flag_rwsem; 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_USR_QUOTA_INO || 1544 ino == EXT4_GRP_QUOTA_INO || 1545 ino == EXT4_BOOT_LOADER_INO || 1546 ino == EXT4_JOURNAL_INO || 1547 ino == EXT4_RESIZE_INO || 1548 (ino >= EXT4_FIRST_INO(sb) && 1549 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1550 } 1551 1552 /* 1553 * Inode dynamic state flags 1554 */ 1555 enum { 1556 EXT4_STATE_JDATA, /* journaled data exists */ 1557 EXT4_STATE_NEW, /* inode is newly created */ 1558 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1559 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1560 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1561 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1562 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1563 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1564 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read 1565 nolocking */ 1566 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1567 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1568 }; 1569 1570 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1571 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1572 { \ 1573 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1574 } \ 1575 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1576 { \ 1577 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1578 } \ 1579 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1580 { \ 1581 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1582 } 1583 1584 /* Add these declarations here only so that these functions can be 1585 * found by name. Otherwise, they are very hard to locate. */ 1586 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1587 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1588 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1589 EXT4_INODE_BIT_FNS(flag, flags, 0) 1590 1591 /* Add these declarations here only so that these functions can be 1592 * found by name. Otherwise, they are very hard to locate. */ 1593 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1594 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1595 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1596 #if (BITS_PER_LONG < 64) 1597 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1598 1599 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1600 { 1601 (ei)->i_state_flags = 0; 1602 } 1603 #else 1604 EXT4_INODE_BIT_FNS(state, flags, 32) 1605 1606 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1607 { 1608 /* We depend on the fact that callers will set i_flags */ 1609 } 1610 #endif 1611 #else 1612 /* Assume that user mode programs are passing in an ext4fs superblock, not 1613 * a kernel struct super_block. This will allow us to call the feature-test 1614 * macros from user land. */ 1615 #define EXT4_SB(sb) (sb) 1616 #endif 1617 1618 /* 1619 * Returns true if the inode is inode is encrypted 1620 */ 1621 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1622 1623 /* 1624 * Codes for operating systems 1625 */ 1626 #define EXT4_OS_LINUX 0 1627 #define EXT4_OS_HURD 1 1628 #define EXT4_OS_MASIX 2 1629 #define EXT4_OS_FREEBSD 3 1630 #define EXT4_OS_LITES 4 1631 1632 /* 1633 * Revision levels 1634 */ 1635 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1636 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1637 1638 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1639 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1640 1641 #define EXT4_GOOD_OLD_INODE_SIZE 128 1642 1643 /* 1644 * Feature set definitions 1645 */ 1646 1647 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1648 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1649 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1650 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1651 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1652 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1653 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1654 1655 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1656 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1657 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1658 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1659 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1660 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1661 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1662 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1663 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1664 /* 1665 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1666 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1667 * all other data structures' checksums. However, the METADATA_CSUM and 1668 * GDT_CSUM bits are mutually exclusive. 1669 */ 1670 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1671 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1672 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 1673 1674 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1675 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1676 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1677 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1678 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1679 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1680 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1681 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1682 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1683 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1684 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1685 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 1686 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1687 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1688 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1689 1690 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 1691 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1692 { \ 1693 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1694 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 1695 } \ 1696 static inline void ext4_set_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 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1702 { \ 1703 EXT4_SB(sb)->s_es->s_feature_compat &= \ 1704 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1705 } 1706 1707 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 1708 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1709 { \ 1710 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1711 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 1712 } \ 1713 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1714 { \ 1715 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 1716 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1717 } \ 1718 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1719 { \ 1720 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 1721 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1722 } 1723 1724 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 1725 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1726 { \ 1727 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1728 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 1729 } \ 1730 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1731 { \ 1732 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 1733 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1734 } \ 1735 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1736 { \ 1737 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 1738 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1739 } 1740 1741 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 1742 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 1743 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 1744 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 1745 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 1746 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 1747 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 1748 1749 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 1750 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 1751 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 1752 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 1753 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 1754 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 1755 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 1756 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 1757 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 1758 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 1759 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 1760 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 1761 1762 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 1763 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 1764 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 1765 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 1766 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 1767 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 1768 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 1769 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 1770 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 1771 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 1772 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 1773 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 1774 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 1775 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 1776 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 1777 1778 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1779 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1780 EXT4_FEATURE_INCOMPAT_META_BG) 1781 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1782 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1783 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1784 1785 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1786 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1787 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1788 EXT4_FEATURE_INCOMPAT_META_BG) 1789 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1790 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1791 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1792 1793 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1794 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1795 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1796 EXT4_FEATURE_INCOMPAT_META_BG| \ 1797 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1798 EXT4_FEATURE_INCOMPAT_64BIT| \ 1799 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1800 EXT4_FEATURE_INCOMPAT_EA_INODE| \ 1801 EXT4_FEATURE_INCOMPAT_MMP | \ 1802 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 1803 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 1804 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \ 1805 EXT4_FEATURE_INCOMPAT_LARGEDIR) 1806 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1807 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1808 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1809 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1810 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1811 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1812 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1813 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1814 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1815 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 1816 EXT4_FEATURE_RO_COMPAT_PROJECT) 1817 1818 #define EXTN_FEATURE_FUNCS(ver) \ 1819 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 1820 { \ 1821 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1822 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 1823 } \ 1824 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 1825 { \ 1826 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1827 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 1828 } \ 1829 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 1830 { \ 1831 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1832 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 1833 } 1834 1835 EXTN_FEATURE_FUNCS(2) 1836 EXTN_FEATURE_FUNCS(3) 1837 EXTN_FEATURE_FUNCS(4) 1838 1839 static inline bool ext4_has_compat_features(struct super_block *sb) 1840 { 1841 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 1842 } 1843 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 1844 { 1845 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 1846 } 1847 static inline bool ext4_has_incompat_features(struct super_block *sb) 1848 { 1849 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 1850 } 1851 1852 /* 1853 * Superblock flags 1854 */ 1855 #define EXT4_FLAGS_RESIZING 0 1856 #define EXT4_FLAGS_SHUTDOWN 1 1857 1858 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi) 1859 { 1860 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 1861 } 1862 1863 1864 /* 1865 * Default values for user and/or group using reserved blocks 1866 */ 1867 #define EXT4_DEF_RESUID 0 1868 #define EXT4_DEF_RESGID 0 1869 1870 /* 1871 * Default project ID 1872 */ 1873 #define EXT4_DEF_PROJID 0 1874 1875 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1876 1877 /* 1878 * Default mount options 1879 */ 1880 #define EXT4_DEFM_DEBUG 0x0001 1881 #define EXT4_DEFM_BSDGROUPS 0x0002 1882 #define EXT4_DEFM_XATTR_USER 0x0004 1883 #define EXT4_DEFM_ACL 0x0008 1884 #define EXT4_DEFM_UID16 0x0010 1885 #define EXT4_DEFM_JMODE 0x0060 1886 #define EXT4_DEFM_JMODE_DATA 0x0020 1887 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1888 #define EXT4_DEFM_JMODE_WBACK 0x0060 1889 #define EXT4_DEFM_NOBARRIER 0x0100 1890 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1891 #define EXT4_DEFM_DISCARD 0x0400 1892 #define EXT4_DEFM_NODELALLOC 0x0800 1893 1894 /* 1895 * Default journal batch times 1896 */ 1897 #define EXT4_DEF_MIN_BATCH_TIME 0 1898 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1899 1900 /* 1901 * Minimum number of groups in a flexgroup before we separate out 1902 * directories into the first block group of a flexgroup 1903 */ 1904 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1905 1906 /* 1907 * Structure of a directory entry 1908 */ 1909 #define EXT4_NAME_LEN 255 1910 1911 struct ext4_dir_entry { 1912 __le32 inode; /* Inode number */ 1913 __le16 rec_len; /* Directory entry length */ 1914 __le16 name_len; /* Name length */ 1915 char name[EXT4_NAME_LEN]; /* File name */ 1916 }; 1917 1918 /* 1919 * The new version of the directory entry. Since EXT4 structures are 1920 * stored in intel byte order, and the name_len field could never be 1921 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1922 * file_type field. 1923 */ 1924 struct ext4_dir_entry_2 { 1925 __le32 inode; /* Inode number */ 1926 __le16 rec_len; /* Directory entry length */ 1927 __u8 name_len; /* Name length */ 1928 __u8 file_type; 1929 char name[EXT4_NAME_LEN]; /* File name */ 1930 }; 1931 1932 /* 1933 * This is a bogus directory entry at the end of each leaf block that 1934 * records checksums. 1935 */ 1936 struct ext4_dir_entry_tail { 1937 __le32 det_reserved_zero1; /* Pretend to be unused */ 1938 __le16 det_rec_len; /* 12 */ 1939 __u8 det_reserved_zero2; /* Zero name length */ 1940 __u8 det_reserved_ft; /* 0xDE, fake file type */ 1941 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1942 }; 1943 1944 #define EXT4_DIRENT_TAIL(block, blocksize) \ 1945 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 1946 ((blocksize) - \ 1947 sizeof(struct ext4_dir_entry_tail)))) 1948 1949 /* 1950 * Ext4 directory file types. Only the low 3 bits are used. The 1951 * other bits are reserved for now. 1952 */ 1953 #define EXT4_FT_UNKNOWN 0 1954 #define EXT4_FT_REG_FILE 1 1955 #define EXT4_FT_DIR 2 1956 #define EXT4_FT_CHRDEV 3 1957 #define EXT4_FT_BLKDEV 4 1958 #define EXT4_FT_FIFO 5 1959 #define EXT4_FT_SOCK 6 1960 #define EXT4_FT_SYMLINK 7 1961 1962 #define EXT4_FT_MAX 8 1963 1964 #define EXT4_FT_DIR_CSUM 0xDE 1965 1966 /* 1967 * EXT4_DIR_PAD defines the directory entries boundaries 1968 * 1969 * NOTE: It must be a multiple of 4 1970 */ 1971 #define EXT4_DIR_PAD 4 1972 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1973 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1974 ~EXT4_DIR_ROUND) 1975 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1976 1977 /* 1978 * If we ever get support for fs block sizes > page_size, we'll need 1979 * to remove the #if statements in the next two functions... 1980 */ 1981 static inline unsigned int 1982 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1983 { 1984 unsigned len = le16_to_cpu(dlen); 1985 1986 #if (PAGE_SIZE >= 65536) 1987 if (len == EXT4_MAX_REC_LEN || len == 0) 1988 return blocksize; 1989 return (len & 65532) | ((len & 3) << 16); 1990 #else 1991 return len; 1992 #endif 1993 } 1994 1995 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1996 { 1997 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1998 BUG(); 1999 #if (PAGE_SIZE >= 65536) 2000 if (len < 65536) 2001 return cpu_to_le16(len); 2002 if (len == blocksize) { 2003 if (blocksize == 65536) 2004 return cpu_to_le16(EXT4_MAX_REC_LEN); 2005 else 2006 return cpu_to_le16(0); 2007 } 2008 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 2009 #else 2010 return cpu_to_le16(len); 2011 #endif 2012 } 2013 2014 /* 2015 * Hash Tree Directory indexing 2016 * (c) Daniel Phillips, 2001 2017 */ 2018 2019 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2020 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2021 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 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 int err; 2041 2042 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2043 2044 desc.shash.tfm = sbi->s_chksum_driver; 2045 desc.shash.flags = 0; 2046 *(u32 *)desc.ctx = crc; 2047 2048 err = crypto_shash_update(&desc.shash, address, length); 2049 BUG_ON(err); 2050 2051 return *(u32 *)desc.ctx; 2052 } 2053 2054 #ifdef __KERNEL__ 2055 2056 /* hash info structure used by the directory hash */ 2057 struct dx_hash_info 2058 { 2059 u32 hash; 2060 u32 minor_hash; 2061 int hash_version; 2062 u32 *seed; 2063 }; 2064 2065 2066 /* 32 and 64 bit signed EOF for dx directories */ 2067 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2068 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2069 2070 2071 /* 2072 * Control parameters used by ext4_htree_next_block 2073 */ 2074 #define HASH_NB_ALWAYS 1 2075 2076 struct ext4_filename { 2077 const struct qstr *usr_fname; 2078 struct fscrypt_str disk_name; 2079 struct dx_hash_info hinfo; 2080 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2081 struct fscrypt_str crypto_buf; 2082 #endif 2083 }; 2084 2085 #define fname_name(p) ((p)->disk_name.name) 2086 #define fname_len(p) ((p)->disk_name.len) 2087 2088 /* 2089 * Describe an inode's exact location on disk and in memory 2090 */ 2091 struct ext4_iloc 2092 { 2093 struct buffer_head *bh; 2094 unsigned long offset; 2095 ext4_group_t block_group; 2096 }; 2097 2098 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2099 { 2100 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2101 } 2102 2103 /* 2104 * This structure is stuffed into the struct file's private_data field 2105 * for directories. It is where we put information so that we can do 2106 * readdir operations in hash tree order. 2107 */ 2108 struct dir_private_info { 2109 struct rb_root root; 2110 struct rb_node *curr_node; 2111 struct fname *extra_fname; 2112 loff_t last_pos; 2113 __u32 curr_hash; 2114 __u32 curr_minor_hash; 2115 __u32 next_hash; 2116 }; 2117 2118 /* calculate the first block number of the group */ 2119 static inline ext4_fsblk_t 2120 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2121 { 2122 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2123 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2124 } 2125 2126 /* 2127 * Special error return code only used by dx_probe() and its callers. 2128 */ 2129 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2130 2131 /* htree levels for ext4 */ 2132 #define EXT4_HTREE_LEVEL_COMPAT 2 2133 #define EXT4_HTREE_LEVEL 3 2134 2135 static inline int ext4_dir_htree_level(struct super_block *sb) 2136 { 2137 return ext4_has_feature_largedir(sb) ? 2138 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT; 2139 } 2140 2141 /* 2142 * Timeout and state flag for lazy initialization inode thread. 2143 */ 2144 #define EXT4_DEF_LI_WAIT_MULT 10 2145 #define EXT4_DEF_LI_MAX_START_DELAY 5 2146 #define EXT4_LAZYINIT_QUIT 0x0001 2147 #define EXT4_LAZYINIT_RUNNING 0x0002 2148 2149 /* 2150 * Lazy inode table initialization info 2151 */ 2152 struct ext4_lazy_init { 2153 unsigned long li_state; 2154 struct list_head li_request_list; 2155 struct mutex li_list_mtx; 2156 }; 2157 2158 struct ext4_li_request { 2159 struct super_block *lr_super; 2160 struct ext4_sb_info *lr_sbi; 2161 ext4_group_t lr_next_group; 2162 struct list_head lr_request; 2163 unsigned long lr_next_sched; 2164 unsigned long lr_timeout; 2165 }; 2166 2167 struct ext4_features { 2168 struct kobject f_kobj; 2169 struct completion f_kobj_unregister; 2170 }; 2171 2172 /* 2173 * This structure will be used for multiple mount protection. It will be 2174 * written into the block number saved in the s_mmp_block field in the 2175 * superblock. Programs that check MMP should assume that if 2176 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2177 * to use the filesystem, regardless of how old the timestamp is. 2178 */ 2179 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2180 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2181 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2182 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2183 2184 struct mmp_struct { 2185 __le32 mmp_magic; /* Magic number for MMP */ 2186 __le32 mmp_seq; /* Sequence no. updated periodically */ 2187 2188 /* 2189 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2190 * purposes and do not affect the correctness of the algorithm 2191 */ 2192 __le64 mmp_time; /* Time last updated */ 2193 char mmp_nodename[64]; /* Node which last updated MMP block */ 2194 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2195 2196 /* 2197 * mmp_check_interval is used to verify if the MMP block has been 2198 * updated on the block device. The value is updated based on the 2199 * maximum time to write the MMP block during an update cycle. 2200 */ 2201 __le16 mmp_check_interval; 2202 2203 __le16 mmp_pad1; 2204 __le32 mmp_pad2[226]; 2205 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2206 }; 2207 2208 /* arguments passed to the mmp thread */ 2209 struct mmpd_data { 2210 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2211 struct super_block *sb; /* super block of the fs */ 2212 }; 2213 2214 /* 2215 * Check interval multiplier 2216 * The MMP block is written every update interval and initially checked every 2217 * update interval x the multiplier (the value is then adapted based on the 2218 * write latency). The reason is that writes can be delayed under load and we 2219 * don't want readers to incorrectly assume that the filesystem is no longer 2220 * in use. 2221 */ 2222 #define EXT4_MMP_CHECK_MULT 2UL 2223 2224 /* 2225 * Minimum interval for MMP checking in seconds. 2226 */ 2227 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2228 2229 /* 2230 * Maximum interval for MMP checking in seconds. 2231 */ 2232 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2233 2234 /* 2235 * Function prototypes 2236 */ 2237 2238 /* 2239 * Ok, these declarations are also in <linux/kernel.h> but none of the 2240 * ext4 source programs needs to include it so they are duplicated here. 2241 */ 2242 # define NORET_TYPE /**/ 2243 # define ATTRIB_NORET __attribute__((noreturn)) 2244 # define NORET_AND noreturn, 2245 2246 struct ext4_xattr_inode_array { 2247 unsigned int count; /* # of used items in the array */ 2248 struct inode *inodes[0]; 2249 }; 2250 /* bitmap.c */ 2251 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2252 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2253 struct ext4_group_desc *gdp, 2254 struct buffer_head *bh, int sz); 2255 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2256 struct ext4_group_desc *gdp, 2257 struct buffer_head *bh, int sz); 2258 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2259 struct ext4_group_desc *gdp, 2260 struct buffer_head *bh); 2261 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2262 struct ext4_group_desc *gdp, 2263 struct buffer_head *bh); 2264 2265 /* balloc.c */ 2266 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2267 ext4_fsblk_t blocknr, 2268 ext4_group_t *blockgrpp, 2269 ext4_grpblk_t *offsetp); 2270 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2271 ext4_fsblk_t block); 2272 2273 extern unsigned int ext4_block_group(struct super_block *sb, 2274 ext4_fsblk_t blocknr); 2275 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2276 ext4_fsblk_t blocknr); 2277 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2278 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2279 ext4_group_t group); 2280 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2281 ext4_fsblk_t goal, 2282 unsigned int flags, 2283 unsigned long *count, 2284 int *errp); 2285 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2286 s64 nclusters, unsigned int flags); 2287 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2288 extern void ext4_check_blocks_bitmap(struct super_block *); 2289 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2290 ext4_group_t block_group, 2291 struct buffer_head ** bh); 2292 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2293 2294 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2295 ext4_group_t block_group); 2296 extern int ext4_wait_block_bitmap(struct super_block *sb, 2297 ext4_group_t block_group, 2298 struct buffer_head *bh); 2299 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2300 ext4_group_t block_group); 2301 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2302 ext4_group_t block_group, 2303 struct ext4_group_desc *gdp); 2304 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2305 2306 static inline bool ext4_encrypted_inode(struct inode *inode) 2307 { 2308 return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT); 2309 } 2310 2311 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2312 static inline int ext4_fname_setup_filename(struct inode *dir, 2313 const struct qstr *iname, 2314 int lookup, struct ext4_filename *fname) 2315 { 2316 struct fscrypt_name name; 2317 int err; 2318 2319 memset(fname, 0, sizeof(struct ext4_filename)); 2320 2321 err = fscrypt_setup_filename(dir, iname, lookup, &name); 2322 2323 fname->usr_fname = name.usr_fname; 2324 fname->disk_name = name.disk_name; 2325 fname->hinfo.hash = name.hash; 2326 fname->hinfo.minor_hash = name.minor_hash; 2327 fname->crypto_buf = name.crypto_buf; 2328 return err; 2329 } 2330 2331 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2332 { 2333 struct fscrypt_name name; 2334 2335 name.crypto_buf = fname->crypto_buf; 2336 fscrypt_free_filename(&name); 2337 2338 fname->crypto_buf.name = NULL; 2339 fname->usr_fname = NULL; 2340 fname->disk_name.name = NULL; 2341 } 2342 #else 2343 static inline int ext4_fname_setup_filename(struct inode *dir, 2344 const struct qstr *iname, 2345 int lookup, struct ext4_filename *fname) 2346 { 2347 fname->usr_fname = iname; 2348 fname->disk_name.name = (unsigned char *) iname->name; 2349 fname->disk_name.len = iname->len; 2350 return 0; 2351 } 2352 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { } 2353 2354 #endif 2355 2356 /* dir.c */ 2357 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2358 struct file *, 2359 struct ext4_dir_entry_2 *, 2360 struct buffer_head *, char *, int, 2361 unsigned int); 2362 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2363 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2364 (de), (bh), (buf), (size), (offset))) 2365 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2366 __u32 minor_hash, 2367 struct ext4_dir_entry_2 *dirent, 2368 struct fscrypt_str *ent_name); 2369 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2370 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2371 struct buffer_head *bh, 2372 void *buf, int buf_size, 2373 struct ext4_filename *fname, 2374 struct ext4_dir_entry_2 **dest_de); 2375 void ext4_insert_dentry(struct inode *inode, 2376 struct ext4_dir_entry_2 *de, 2377 int buf_size, 2378 struct ext4_filename *fname); 2379 static inline void ext4_update_dx_flag(struct inode *inode) 2380 { 2381 if (!ext4_has_feature_dir_index(inode->i_sb)) 2382 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2383 } 2384 static const unsigned char ext4_filetype_table[] = { 2385 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2386 }; 2387 2388 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2389 { 2390 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2391 return DT_UNKNOWN; 2392 2393 return ext4_filetype_table[filetype]; 2394 } 2395 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2396 void *buf, int buf_size); 2397 2398 /* fsync.c */ 2399 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2400 2401 /* hash.c */ 2402 extern int ext4fs_dirhash(const char *name, int len, struct 2403 dx_hash_info *hinfo); 2404 2405 /* ialloc.c */ 2406 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2407 const struct qstr *qstr, __u32 goal, 2408 uid_t *owner, __u32 i_flags, 2409 int handle_type, unsigned int line_no, 2410 int nblocks); 2411 2412 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \ 2413 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2414 i_flags, 0, 0, 0) 2415 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2416 type, nblocks) \ 2417 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2418 0, (type), __LINE__, (nblocks)) 2419 2420 2421 extern void ext4_free_inode(handle_t *, struct inode *); 2422 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2423 extern unsigned long ext4_count_free_inodes(struct super_block *); 2424 extern unsigned long ext4_count_dirs(struct super_block *); 2425 extern void ext4_check_inodes_bitmap(struct super_block *); 2426 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2427 extern int ext4_init_inode_table(struct super_block *sb, 2428 ext4_group_t group, int barrier); 2429 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2430 2431 /* mballoc.c */ 2432 extern const struct file_operations ext4_seq_mb_groups_fops; 2433 extern long ext4_mb_stats; 2434 extern long ext4_mb_max_to_scan; 2435 extern int ext4_mb_init(struct super_block *); 2436 extern int ext4_mb_release(struct super_block *); 2437 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2438 struct ext4_allocation_request *, int *); 2439 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2440 extern void ext4_discard_preallocations(struct inode *); 2441 extern int __init ext4_init_mballoc(void); 2442 extern void ext4_exit_mballoc(void); 2443 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2444 struct buffer_head *bh, ext4_fsblk_t block, 2445 unsigned long count, int flags); 2446 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2447 ext4_group_t ngroups); 2448 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2449 ext4_group_t i, struct ext4_group_desc *desc); 2450 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2451 ext4_fsblk_t block, unsigned long count); 2452 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2453 2454 /* inode.c */ 2455 int ext4_inode_is_fast_symlink(struct inode *inode); 2456 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2457 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2458 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2459 struct buffer_head *bh_result, int create); 2460 int ext4_get_block(struct inode *inode, sector_t iblock, 2461 struct buffer_head *bh_result, int create); 2462 int ext4_dio_get_block(struct inode *inode, sector_t iblock, 2463 struct buffer_head *bh_result, int create); 2464 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2465 struct buffer_head *bh, int create); 2466 int ext4_walk_page_buffers(handle_t *handle, 2467 struct buffer_head *head, 2468 unsigned from, 2469 unsigned to, 2470 int *partial, 2471 int (*fn)(handle_t *handle, 2472 struct buffer_head *bh)); 2473 int do_journal_get_write_access(handle_t *handle, 2474 struct buffer_head *bh); 2475 #define FALL_BACK_TO_NONDELALLOC 1 2476 #define CONVERT_INLINE_DATA 2 2477 2478 extern struct inode *ext4_iget(struct super_block *, unsigned long); 2479 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long); 2480 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2481 extern int ext4_setattr(struct dentry *, struct iattr *); 2482 extern int ext4_getattr(const struct path *, struct kstat *, u32, unsigned int); 2483 extern void ext4_evict_inode(struct inode *); 2484 extern void ext4_clear_inode(struct inode *); 2485 extern int ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int); 2486 extern int ext4_sync_inode(handle_t *, struct inode *); 2487 extern void ext4_dirty_inode(struct inode *, int); 2488 extern int ext4_change_inode_journal_flag(struct inode *, int); 2489 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2490 extern int ext4_inode_attach_jinode(struct inode *inode); 2491 extern int ext4_can_truncate(struct inode *inode); 2492 extern int ext4_truncate(struct inode *); 2493 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2494 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 2495 extern void ext4_set_inode_flags(struct inode *); 2496 extern int ext4_alloc_da_blocks(struct inode *inode); 2497 extern void ext4_set_aops(struct inode *inode); 2498 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int chunk); 2499 extern int ext4_writepage_trans_blocks(struct inode *); 2500 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2501 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2502 loff_t lstart, loff_t lend); 2503 extern int ext4_page_mkwrite(struct vm_fault *vmf); 2504 extern int ext4_filemap_fault(struct vm_fault *vmf); 2505 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2506 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 2507 extern void ext4_da_update_reserve_space(struct inode *inode, 2508 int used, int quota_claim); 2509 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 2510 ext4_fsblk_t pblk, ext4_lblk_t len); 2511 extern int ext4_get_next_extent(struct inode *inode, ext4_lblk_t lblk, 2512 unsigned int map_len, 2513 struct extent_status *result); 2514 2515 /* indirect.c */ 2516 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2517 struct ext4_map_blocks *map, int flags); 2518 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2519 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2520 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2521 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2522 ext4_lblk_t start, ext4_lblk_t end); 2523 2524 /* ioctl.c */ 2525 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2526 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2527 2528 /* migrate.c */ 2529 extern int ext4_ext_migrate(struct inode *); 2530 extern int ext4_ind_migrate(struct inode *inode); 2531 2532 /* namei.c */ 2533 extern int ext4_dirent_csum_verify(struct inode *inode, 2534 struct ext4_dir_entry *dirent); 2535 extern int ext4_orphan_add(handle_t *, struct inode *); 2536 extern int ext4_orphan_del(handle_t *, struct inode *); 2537 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2538 __u32 start_minor_hash, __u32 *next_hash); 2539 extern int ext4_search_dir(struct buffer_head *bh, 2540 char *search_buf, 2541 int buf_size, 2542 struct inode *dir, 2543 struct ext4_filename *fname, 2544 unsigned int offset, 2545 struct ext4_dir_entry_2 **res_dir); 2546 extern int ext4_generic_delete_entry(handle_t *handle, 2547 struct inode *dir, 2548 struct ext4_dir_entry_2 *de_del, 2549 struct buffer_head *bh, 2550 void *entry_buf, 2551 int buf_size, 2552 int csum_size); 2553 extern bool ext4_empty_dir(struct inode *inode); 2554 2555 /* resize.c */ 2556 extern int ext4_group_add(struct super_block *sb, 2557 struct ext4_new_group_data *input); 2558 extern int ext4_group_extend(struct super_block *sb, 2559 struct ext4_super_block *es, 2560 ext4_fsblk_t n_blocks_count); 2561 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2562 2563 /* super.c */ 2564 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 2565 extern int ext4_calculate_overhead(struct super_block *sb); 2566 extern void ext4_superblock_csum_set(struct super_block *sb); 2567 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 2568 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 2569 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2570 ext4_group_t ngroup); 2571 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2572 char nbuf[16]); 2573 2574 extern __printf(4, 5) 2575 void __ext4_error(struct super_block *, const char *, unsigned int, 2576 const char *, ...); 2577 extern __printf(5, 6) 2578 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2579 const char *, ...); 2580 extern __printf(5, 6) 2581 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2582 const char *, ...); 2583 extern void __ext4_std_error(struct super_block *, const char *, 2584 unsigned int, int); 2585 extern __printf(4, 5) 2586 void __ext4_abort(struct super_block *, const char *, unsigned int, 2587 const char *, ...); 2588 extern __printf(4, 5) 2589 void __ext4_warning(struct super_block *, const char *, unsigned int, 2590 const char *, ...); 2591 extern __printf(4, 5) 2592 void __ext4_warning_inode(const struct inode *inode, const char *function, 2593 unsigned int line, const char *fmt, ...); 2594 extern __printf(3, 4) 2595 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2596 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2597 const char *, unsigned int, const char *); 2598 extern __printf(7, 8) 2599 void __ext4_grp_locked_error(const char *, unsigned int, 2600 struct super_block *, ext4_group_t, 2601 unsigned long, ext4_fsblk_t, 2602 const char *, ...); 2603 2604 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 2605 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 2606 2607 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 2608 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 2609 2610 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 2611 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 2612 2613 #ifdef CONFIG_PRINTK 2614 2615 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2616 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__) 2617 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2618 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2619 #define ext4_error(sb, fmt, ...) \ 2620 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2621 #define ext4_abort(sb, fmt, ...) \ 2622 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2623 #define ext4_warning(sb, fmt, ...) \ 2624 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2625 #define ext4_warning_inode(inode, fmt, ...) \ 2626 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 2627 #define ext4_msg(sb, level, fmt, ...) \ 2628 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 2629 #define dump_mmp_msg(sb, mmp, msg) \ 2630 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 2631 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2632 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 2633 fmt, ##__VA_ARGS__) 2634 2635 #else 2636 2637 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2638 do { \ 2639 no_printk(fmt, ##__VA_ARGS__); \ 2640 __ext4_error_inode(inode, "", 0, block, " "); \ 2641 } while (0) 2642 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2643 do { \ 2644 no_printk(fmt, ##__VA_ARGS__); \ 2645 __ext4_error_file(file, "", 0, block, " "); \ 2646 } while (0) 2647 #define ext4_error(sb, fmt, ...) \ 2648 do { \ 2649 no_printk(fmt, ##__VA_ARGS__); \ 2650 __ext4_error(sb, "", 0, " "); \ 2651 } while (0) 2652 #define ext4_abort(sb, fmt, ...) \ 2653 do { \ 2654 no_printk(fmt, ##__VA_ARGS__); \ 2655 __ext4_abort(sb, "", 0, " "); \ 2656 } while (0) 2657 #define ext4_warning(sb, fmt, ...) \ 2658 do { \ 2659 no_printk(fmt, ##__VA_ARGS__); \ 2660 __ext4_warning(sb, "", 0, " "); \ 2661 } while (0) 2662 #define ext4_warning_inode(inode, fmt, ...) \ 2663 do { \ 2664 no_printk(fmt, ##__VA_ARGS__); \ 2665 __ext4_warning_inode(inode, "", 0, " "); \ 2666 } while (0) 2667 #define ext4_msg(sb, level, fmt, ...) \ 2668 do { \ 2669 no_printk(fmt, ##__VA_ARGS__); \ 2670 __ext4_msg(sb, "", " "); \ 2671 } while (0) 2672 #define dump_mmp_msg(sb, mmp, msg) \ 2673 __dump_mmp_msg(sb, mmp, "", 0, "") 2674 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2675 do { \ 2676 no_printk(fmt, ##__VA_ARGS__); \ 2677 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 2678 } while (0) 2679 2680 #endif 2681 2682 extern void ext4_update_dynamic_rev(struct super_block *sb); 2683 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2684 __u32 compat); 2685 extern int ext4_update_rocompat_feature(handle_t *handle, 2686 struct super_block *sb, __u32 rocompat); 2687 extern int ext4_update_incompat_feature(handle_t *handle, 2688 struct super_block *sb, __u32 incompat); 2689 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2690 struct ext4_group_desc *bg); 2691 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2692 struct ext4_group_desc *bg); 2693 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2694 struct ext4_group_desc *bg); 2695 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2696 struct ext4_group_desc *bg); 2697 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2698 struct ext4_group_desc *bg); 2699 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2700 struct ext4_group_desc *bg); 2701 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2702 struct ext4_group_desc *bg); 2703 extern void ext4_block_bitmap_set(struct super_block *sb, 2704 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2705 extern void ext4_inode_bitmap_set(struct super_block *sb, 2706 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2707 extern void ext4_inode_table_set(struct super_block *sb, 2708 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2709 extern void ext4_free_group_clusters_set(struct super_block *sb, 2710 struct ext4_group_desc *bg, 2711 __u32 count); 2712 extern void ext4_free_inodes_set(struct super_block *sb, 2713 struct ext4_group_desc *bg, __u32 count); 2714 extern void ext4_used_dirs_set(struct super_block *sb, 2715 struct ext4_group_desc *bg, __u32 count); 2716 extern void ext4_itable_unused_set(struct super_block *sb, 2717 struct ext4_group_desc *bg, __u32 count); 2718 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2719 struct ext4_group_desc *gdp); 2720 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2721 struct ext4_group_desc *gdp); 2722 extern int ext4_register_li_request(struct super_block *sb, 2723 ext4_group_t first_not_zeroed); 2724 2725 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2726 { 2727 return ext4_has_feature_gdt_csum(sb) || 2728 EXT4_SB(sb)->s_chksum_driver != NULL; 2729 } 2730 2731 static inline int ext4_has_metadata_csum(struct super_block *sb) 2732 { 2733 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 2734 !EXT4_SB(sb)->s_chksum_driver); 2735 2736 return (EXT4_SB(sb)->s_chksum_driver != NULL); 2737 } 2738 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2739 { 2740 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2741 le32_to_cpu(es->s_blocks_count_lo); 2742 } 2743 2744 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2745 { 2746 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2747 le32_to_cpu(es->s_r_blocks_count_lo); 2748 } 2749 2750 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2751 { 2752 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2753 le32_to_cpu(es->s_free_blocks_count_lo); 2754 } 2755 2756 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2757 ext4_fsblk_t blk) 2758 { 2759 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2760 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2761 } 2762 2763 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2764 ext4_fsblk_t blk) 2765 { 2766 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2767 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2768 } 2769 2770 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2771 ext4_fsblk_t blk) 2772 { 2773 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2774 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2775 } 2776 2777 static inline loff_t ext4_isize(struct super_block *sb, 2778 struct ext4_inode *raw_inode) 2779 { 2780 if (ext4_has_feature_largedir(sb) || 2781 S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2782 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2783 le32_to_cpu(raw_inode->i_size_lo); 2784 2785 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2786 } 2787 2788 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2789 { 2790 raw_inode->i_size_lo = cpu_to_le32(i_size); 2791 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2792 } 2793 2794 static inline 2795 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2796 ext4_group_t group) 2797 { 2798 struct ext4_group_info ***grp_info; 2799 long indexv, indexh; 2800 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 2801 grp_info = EXT4_SB(sb)->s_group_info; 2802 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2803 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2804 return grp_info[indexv][indexh]; 2805 } 2806 2807 /* 2808 * Reading s_groups_count requires using smp_rmb() afterwards. See 2809 * the locking protocol documented in the comments of ext4_group_add() 2810 * in resize.c 2811 */ 2812 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2813 { 2814 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2815 2816 smp_rmb(); 2817 return ngroups; 2818 } 2819 2820 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2821 ext4_group_t block_group) 2822 { 2823 return block_group >> sbi->s_log_groups_per_flex; 2824 } 2825 2826 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2827 { 2828 return 1 << sbi->s_log_groups_per_flex; 2829 } 2830 2831 #define ext4_std_error(sb, errno) \ 2832 do { \ 2833 if ((errno)) \ 2834 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2835 } while (0) 2836 2837 #ifdef CONFIG_SMP 2838 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2839 * counters. So we need to make sure we have free clusters more 2840 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2841 */ 2842 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2843 #else 2844 #define EXT4_FREECLUSTERS_WATERMARK 0 2845 #endif 2846 2847 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 2848 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2849 { 2850 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 2851 !inode_is_locked(inode)); 2852 down_write(&EXT4_I(inode)->i_data_sem); 2853 if (newsize > EXT4_I(inode)->i_disksize) 2854 EXT4_I(inode)->i_disksize = newsize; 2855 up_write(&EXT4_I(inode)->i_data_sem); 2856 } 2857 2858 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 2859 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 2860 { 2861 int changed = 0; 2862 2863 if (newsize > inode->i_size) { 2864 i_size_write(inode, newsize); 2865 changed = 1; 2866 } 2867 if (newsize > EXT4_I(inode)->i_disksize) { 2868 ext4_update_i_disksize(inode, newsize); 2869 changed |= 2; 2870 } 2871 return changed; 2872 } 2873 2874 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 2875 loff_t len); 2876 2877 struct ext4_group_info { 2878 unsigned long bb_state; 2879 struct rb_root bb_free_root; 2880 ext4_grpblk_t bb_first_free; /* first free block */ 2881 ext4_grpblk_t bb_free; /* total free blocks */ 2882 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 2883 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 2884 struct list_head bb_prealloc_list; 2885 #ifdef DOUBLE_CHECK 2886 void *bb_bitmap; 2887 #endif 2888 struct rw_semaphore alloc_sem; 2889 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2890 * regions, index is order. 2891 * bb_counters[3] = 5 means 2892 * 5 free 8-block regions. */ 2893 }; 2894 2895 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 2896 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 2897 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 2898 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 2899 2900 #define EXT4_MB_GRP_NEED_INIT(grp) \ 2901 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 2902 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 2903 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2904 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 2905 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2906 2907 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 2908 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2909 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 2910 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2911 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 2912 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2913 2914 #define EXT4_MAX_CONTENTION 8 2915 #define EXT4_CONTENTION_THRESHOLD 2 2916 2917 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2918 ext4_group_t group) 2919 { 2920 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2921 } 2922 2923 /* 2924 * Returns true if the filesystem is busy enough that attempts to 2925 * access the block group locks has run into contention. 2926 */ 2927 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 2928 { 2929 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 2930 } 2931 2932 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 2933 { 2934 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 2935 if (spin_trylock(lock)) 2936 /* 2937 * We're able to grab the lock right away, so drop the 2938 * lock contention counter. 2939 */ 2940 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 2941 else { 2942 /* 2943 * The lock is busy, so bump the contention counter, 2944 * and then wait on the spin lock. 2945 */ 2946 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 2947 EXT4_MAX_CONTENTION); 2948 spin_lock(lock); 2949 } 2950 } 2951 2952 static inline void ext4_unlock_group(struct super_block *sb, 2953 ext4_group_t group) 2954 { 2955 spin_unlock(ext4_group_lock_ptr(sb, group)); 2956 } 2957 2958 /* 2959 * Block validity checking 2960 */ 2961 #define ext4_check_indirect_blockref(inode, bh) \ 2962 ext4_check_blockref(__func__, __LINE__, inode, \ 2963 (__le32 *)(bh)->b_data, \ 2964 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 2965 2966 #define ext4_ind_check_inode(inode) \ 2967 ext4_check_blockref(__func__, __LINE__, inode, \ 2968 EXT4_I(inode)->i_data, \ 2969 EXT4_NDIR_BLOCKS) 2970 2971 /* 2972 * Inodes and files operations 2973 */ 2974 2975 /* dir.c */ 2976 extern const struct file_operations ext4_dir_operations; 2977 2978 /* file.c */ 2979 extern const struct inode_operations ext4_file_inode_operations; 2980 extern const struct file_operations ext4_file_operations; 2981 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 2982 2983 /* inline.c */ 2984 extern int ext4_get_max_inline_size(struct inode *inode); 2985 extern int ext4_find_inline_data_nolock(struct inode *inode); 2986 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 2987 unsigned int len); 2988 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 2989 2990 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 2991 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 2992 struct inode *inode, 2993 loff_t pos, unsigned len, 2994 unsigned flags, 2995 struct page **pagep); 2996 extern int ext4_write_inline_data_end(struct inode *inode, 2997 loff_t pos, unsigned len, 2998 unsigned copied, 2999 struct page *page); 3000 extern struct buffer_head * 3001 ext4_journalled_write_inline_data(struct inode *inode, 3002 unsigned len, 3003 struct page *page); 3004 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 3005 struct inode *inode, 3006 loff_t pos, unsigned len, 3007 unsigned flags, 3008 struct page **pagep, 3009 void **fsdata); 3010 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 3011 unsigned len, unsigned copied, 3012 struct page *page); 3013 extern int ext4_try_add_inline_entry(handle_t *handle, 3014 struct ext4_filename *fname, 3015 struct inode *dir, struct inode *inode); 3016 extern int ext4_try_create_inline_dir(handle_t *handle, 3017 struct inode *parent, 3018 struct inode *inode); 3019 extern int ext4_read_inline_dir(struct file *filp, 3020 struct dir_context *ctx, 3021 int *has_inline_data); 3022 extern int htree_inlinedir_to_tree(struct file *dir_file, 3023 struct inode *dir, ext4_lblk_t block, 3024 struct dx_hash_info *hinfo, 3025 __u32 start_hash, __u32 start_minor_hash, 3026 int *has_inline_data); 3027 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3028 struct ext4_filename *fname, 3029 struct ext4_dir_entry_2 **res_dir, 3030 int *has_inline_data); 3031 extern int ext4_delete_inline_entry(handle_t *handle, 3032 struct inode *dir, 3033 struct ext4_dir_entry_2 *de_del, 3034 struct buffer_head *bh, 3035 int *has_inline_data); 3036 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); 3037 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3038 struct ext4_dir_entry_2 **parent_de, 3039 int *retval); 3040 extern int ext4_inline_data_fiemap(struct inode *inode, 3041 struct fiemap_extent_info *fieinfo, 3042 int *has_inline, __u64 start, __u64 len); 3043 extern int ext4_try_to_evict_inline_data(handle_t *handle, 3044 struct inode *inode, 3045 int needed); 3046 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3047 3048 extern int ext4_convert_inline_data(struct inode *inode); 3049 3050 static inline int ext4_has_inline_data(struct inode *inode) 3051 { 3052 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3053 EXT4_I(inode)->i_inline_off; 3054 } 3055 3056 /* namei.c */ 3057 extern const struct inode_operations ext4_dir_inode_operations; 3058 extern const struct inode_operations ext4_special_inode_operations; 3059 extern struct dentry *ext4_get_parent(struct dentry *child); 3060 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3061 struct ext4_dir_entry_2 *de, 3062 int blocksize, int csum_size, 3063 unsigned int parent_ino, int dotdot_real_len); 3064 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t, 3065 unsigned int blocksize); 3066 extern int ext4_handle_dirty_dirent_node(handle_t *handle, 3067 struct inode *inode, 3068 struct buffer_head *bh); 3069 #define S_SHIFT 12 3070 static const unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = { 3071 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3072 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3073 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3074 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3075 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3076 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3077 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3078 }; 3079 3080 static inline void ext4_set_de_type(struct super_block *sb, 3081 struct ext4_dir_entry_2 *de, 3082 umode_t mode) { 3083 if (ext4_has_feature_filetype(sb)) 3084 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3085 } 3086 3087 /* readpages.c */ 3088 extern int ext4_mpage_readpages(struct address_space *mapping, 3089 struct list_head *pages, struct page *page, 3090 unsigned nr_pages); 3091 3092 /* symlink.c */ 3093 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3094 extern const struct inode_operations ext4_symlink_inode_operations; 3095 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3096 3097 /* sysfs.c */ 3098 extern int ext4_register_sysfs(struct super_block *sb); 3099 extern void ext4_unregister_sysfs(struct super_block *sb); 3100 extern int __init ext4_init_sysfs(void); 3101 extern void ext4_exit_sysfs(void); 3102 3103 /* block_validity */ 3104 extern void ext4_release_system_zone(struct super_block *sb); 3105 extern int ext4_setup_system_zone(struct super_block *sb); 3106 extern int __init ext4_init_system_zone(void); 3107 extern void ext4_exit_system_zone(void); 3108 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 3109 ext4_fsblk_t start_blk, 3110 unsigned int count); 3111 extern int ext4_check_blockref(const char *, unsigned int, 3112 struct inode *, __le32 *, unsigned int); 3113 3114 /* extents.c */ 3115 struct ext4_ext_path; 3116 struct ext4_extent; 3117 3118 /* 3119 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3120 * __le32. 3121 */ 3122 #define EXT_MAX_BLOCKS 0xffffffff 3123 3124 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 3125 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 3126 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3127 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3128 struct ext4_map_blocks *map, int flags); 3129 extern int ext4_ext_truncate(handle_t *, struct inode *); 3130 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3131 ext4_lblk_t end); 3132 extern void ext4_ext_init(struct super_block *); 3133 extern void ext4_ext_release(struct super_block *); 3134 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3135 loff_t len); 3136 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3137 loff_t offset, ssize_t len); 3138 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3139 struct ext4_map_blocks *map, int flags); 3140 extern int ext4_ext_calc_metadata_amount(struct inode *inode, 3141 ext4_lblk_t lblocks); 3142 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3143 int num, 3144 struct ext4_ext_path *path); 3145 extern int ext4_can_extents_be_merged(struct inode *inode, 3146 struct ext4_extent *ex1, 3147 struct ext4_extent *ex2); 3148 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3149 struct ext4_ext_path **, 3150 struct ext4_extent *, int); 3151 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3152 struct ext4_ext_path **, 3153 int flags); 3154 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 3155 extern int ext4_ext_check_inode(struct inode *inode); 3156 extern int ext4_find_delalloc_range(struct inode *inode, 3157 ext4_lblk_t lblk_start, 3158 ext4_lblk_t lblk_end); 3159 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk); 3160 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3161 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3162 __u64 start, __u64 len); 3163 extern int ext4_ext_precache(struct inode *inode); 3164 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len); 3165 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len); 3166 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3167 struct inode *inode2, ext4_lblk_t lblk1, 3168 ext4_lblk_t lblk2, ext4_lblk_t count, 3169 int mark_unwritten,int *err); 3170 3171 /* move_extent.c */ 3172 extern void ext4_double_down_write_data_sem(struct inode *first, 3173 struct inode *second); 3174 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3175 struct inode *donor_inode); 3176 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3177 __u64 start_orig, __u64 start_donor, 3178 __u64 len, __u64 *moved_len); 3179 3180 /* page-io.c */ 3181 extern int __init ext4_init_pageio(void); 3182 extern void ext4_exit_pageio(void); 3183 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3184 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3185 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3186 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3187 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3188 struct writeback_control *wbc); 3189 extern void ext4_end_io_rsv_work(struct work_struct *work); 3190 extern void ext4_io_submit(struct ext4_io_submit *io); 3191 extern int ext4_bio_write_page(struct ext4_io_submit *io, 3192 struct page *page, 3193 int len, 3194 struct writeback_control *wbc, 3195 bool keep_towrite); 3196 3197 /* mmp.c */ 3198 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3199 3200 /* 3201 * Add new method to test whether block and inode bitmaps are properly 3202 * initialized. With uninit_bg reading the block from disk is not enough 3203 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3204 */ 3205 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3206 3207 static inline int bitmap_uptodate(struct buffer_head *bh) 3208 { 3209 return (buffer_uptodate(bh) && 3210 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3211 } 3212 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3213 { 3214 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3215 } 3216 3217 /* 3218 * Disable DIO read nolock optimization, so new dioreaders will be forced 3219 * to grab i_mutex 3220 */ 3221 static inline void ext4_inode_block_unlocked_dio(struct inode *inode) 3222 { 3223 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 3224 smp_mb(); 3225 } 3226 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode) 3227 { 3228 smp_mb(); 3229 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 3230 } 3231 3232 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3233 3234 /* For ioend & aio unwritten conversion wait queues */ 3235 #define EXT4_WQ_HASH_SZ 37 3236 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3237 EXT4_WQ_HASH_SZ]) 3238 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3239 3240 extern int ext4_resize_begin(struct super_block *sb); 3241 extern void ext4_resize_end(struct super_block *sb); 3242 3243 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 3244 struct ext4_io_end *io_end) 3245 { 3246 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 3247 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3248 atomic_inc(&EXT4_I(inode)->i_unwritten); 3249 } 3250 } 3251 3252 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3253 { 3254 struct inode *inode = io_end->inode; 3255 3256 if (io_end->flag & EXT4_IO_END_UNWRITTEN) { 3257 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3258 /* Wake up anyone waiting on unwritten extent conversion */ 3259 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) 3260 wake_up_all(ext4_ioend_wq(inode)); 3261 } 3262 } 3263 3264 extern const struct iomap_ops ext4_iomap_ops; 3265 3266 #endif /* __KERNEL__ */ 3267 3268 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3269 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3270 3271 #endif /* _EXT4_H */ 3272