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/blockgroup_lock.h> 32 #include <linux/percpu_counter.h> 33 #include <linux/ratelimit.h> 34 #include <crypto/hash.h> 35 #ifdef CONFIG_EXT4_FS_ENCRYPTION 36 #include <linux/fscrypt_supp.h> 37 #else 38 #include <linux/fscrypt_notsupp.h> 39 #endif 40 #include <linux/falloc.h> 41 #include <linux/percpu-rwsem.h> 42 #ifdef __KERNEL__ 43 #include <linux/compat.h> 44 #endif 45 46 /* 47 * The fourth extended filesystem constants/structures 48 */ 49 50 /* 51 * with AGGRESSIVE_CHECK allocator runs consistency checks over 52 * structures. these checks slow things down a lot 53 */ 54 #define AGGRESSIVE_CHECK__ 55 56 /* 57 * with DOUBLE_CHECK defined mballoc creates persistent in-core 58 * bitmaps, maintains and uses them to check for double allocations 59 */ 60 #define DOUBLE_CHECK__ 61 62 /* 63 * Define EXT4FS_DEBUG to produce debug messages 64 */ 65 #undef EXT4FS_DEBUG 66 67 /* 68 * Debug code 69 */ 70 #ifdef EXT4FS_DEBUG 71 #define ext4_debug(f, a...) \ 72 do { \ 73 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 74 __FILE__, __LINE__, __func__); \ 75 printk(KERN_DEBUG f, ## a); \ 76 } while (0) 77 #else 78 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 79 #endif 80 81 /* 82 * Turn on EXT_DEBUG to get lots of info about extents operations. 83 */ 84 #define EXT_DEBUG__ 85 #ifdef EXT_DEBUG 86 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__) 87 #else 88 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 89 #endif 90 91 /* data type for block offset of block group */ 92 typedef int ext4_grpblk_t; 93 94 /* data type for filesystem-wide blocks number */ 95 typedef unsigned long long ext4_fsblk_t; 96 97 /* data type for file logical block number */ 98 typedef __u32 ext4_lblk_t; 99 100 /* data type for block group number */ 101 typedef unsigned int ext4_group_t; 102 103 enum SHIFT_DIRECTION { 104 SHIFT_LEFT = 0, 105 SHIFT_RIGHT, 106 }; 107 108 /* 109 * Flags used in mballoc's allocation_context flags field. 110 * 111 * Also used to show what's going on for debugging purposes when the 112 * flag field is exported via the traceport interface 113 */ 114 115 /* prefer goal again. length */ 116 #define EXT4_MB_HINT_MERGE 0x0001 117 /* blocks already reserved */ 118 #define EXT4_MB_HINT_RESERVED 0x0002 119 /* metadata is being allocated */ 120 #define EXT4_MB_HINT_METADATA 0x0004 121 /* first blocks in the file */ 122 #define EXT4_MB_HINT_FIRST 0x0008 123 /* search for the best chunk */ 124 #define EXT4_MB_HINT_BEST 0x0010 125 /* data is being allocated */ 126 #define EXT4_MB_HINT_DATA 0x0020 127 /* don't preallocate (for tails) */ 128 #define EXT4_MB_HINT_NOPREALLOC 0x0040 129 /* allocate for locality group */ 130 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 131 /* allocate goal blocks or none */ 132 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 133 /* goal is meaningful */ 134 #define EXT4_MB_HINT_TRY_GOAL 0x0200 135 /* blocks already pre-reserved by delayed allocation */ 136 #define EXT4_MB_DELALLOC_RESERVED 0x0400 137 /* We are doing stream allocation */ 138 #define EXT4_MB_STREAM_ALLOC 0x0800 139 /* Use reserved root blocks if needed */ 140 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 141 /* Use blocks from reserved pool */ 142 #define EXT4_MB_USE_RESERVED 0x2000 143 144 struct ext4_allocation_request { 145 /* target inode for block we're allocating */ 146 struct inode *inode; 147 /* how many blocks we want to allocate */ 148 unsigned int len; 149 /* logical block in target inode */ 150 ext4_lblk_t logical; 151 /* the closest logical allocated block to the left */ 152 ext4_lblk_t lleft; 153 /* the closest logical allocated block to the right */ 154 ext4_lblk_t lright; 155 /* phys. target (a hint) */ 156 ext4_fsblk_t goal; 157 /* phys. block for the closest logical allocated block to the left */ 158 ext4_fsblk_t pleft; 159 /* phys. block for the closest logical allocated block to the right */ 160 ext4_fsblk_t pright; 161 /* flags. see above EXT4_MB_HINT_* */ 162 unsigned int flags; 163 }; 164 165 /* 166 * Logical to physical block mapping, used by ext4_map_blocks() 167 * 168 * This structure is used to pass requests into ext4_map_blocks() as 169 * well as to store the information returned by ext4_map_blocks(). It 170 * takes less room on the stack than a struct buffer_head. 171 */ 172 #define EXT4_MAP_NEW (1 << BH_New) 173 #define EXT4_MAP_MAPPED (1 << BH_Mapped) 174 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 175 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 176 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 177 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 178 179 struct ext4_map_blocks { 180 ext4_fsblk_t m_pblk; 181 ext4_lblk_t m_lblk; 182 unsigned int m_len; 183 unsigned int m_flags; 184 }; 185 186 /* 187 * Flags for ext4_io_end->flags 188 */ 189 #define EXT4_IO_END_UNWRITTEN 0x0001 190 191 /* 192 * For converting unwritten extents on a work queue. 'handle' is used for 193 * buffered writeback. 194 */ 195 typedef struct ext4_io_end { 196 struct list_head list; /* per-file finished IO list */ 197 handle_t *handle; /* handle reserved for extent 198 * conversion */ 199 struct inode *inode; /* file being written to */ 200 struct bio *bio; /* Linked list of completed 201 * bios covering the extent */ 202 unsigned int flag; /* unwritten or not */ 203 atomic_t count; /* reference counter */ 204 loff_t offset; /* offset in the file */ 205 ssize_t size; /* size of the extent */ 206 } ext4_io_end_t; 207 208 struct ext4_io_submit { 209 struct writeback_control *io_wbc; 210 struct bio *io_bio; 211 ext4_io_end_t *io_end; 212 sector_t io_next_block; 213 }; 214 215 /* 216 * Special inodes numbers 217 */ 218 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 219 #define EXT4_ROOT_INO 2 /* Root inode */ 220 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 221 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 222 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 223 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 224 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 225 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 226 227 /* First non-reserved inode for old ext4 filesystems */ 228 #define EXT4_GOOD_OLD_FIRST_INO 11 229 230 /* 231 * Maximal count of links to a file 232 */ 233 #define EXT4_LINK_MAX 65000 234 235 /* 236 * Macro-instructions used to manage several block sizes 237 */ 238 #define EXT4_MIN_BLOCK_SIZE 1024 239 #define EXT4_MAX_BLOCK_SIZE 65536 240 #define EXT4_MIN_BLOCK_LOG_SIZE 10 241 #define EXT4_MAX_BLOCK_LOG_SIZE 16 242 #define EXT4_MAX_CLUSTER_LOG_SIZE 30 243 #ifdef __KERNEL__ 244 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 245 #else 246 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 247 #endif 248 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 249 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 250 EXT4_SB(s)->s_cluster_bits) 251 #ifdef __KERNEL__ 252 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 253 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 254 #else 255 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 256 #endif 257 #ifdef __KERNEL__ 258 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 259 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 260 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 261 #else 262 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 263 EXT4_GOOD_OLD_INODE_SIZE : \ 264 (s)->s_inode_size) 265 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 266 EXT4_GOOD_OLD_FIRST_INO : \ 267 (s)->s_first_ino) 268 #endif 269 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 270 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \ 271 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \ 272 blkbits)) 273 274 /* Translate a block number to a cluster number */ 275 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 276 /* Translate a cluster number to a block number */ 277 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 278 /* Translate # of blks to # of clusters */ 279 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 280 (sbi)->s_cluster_bits) 281 /* Mask out the low bits to get the starting block of the cluster */ 282 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 283 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 284 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 285 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 286 /* Get the cluster offset */ 287 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 288 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 289 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 290 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 291 292 /* 293 * Structure of a blocks group descriptor 294 */ 295 struct ext4_group_desc 296 { 297 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 298 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 299 __le32 bg_inode_table_lo; /* Inodes table block */ 300 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 301 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 302 __le16 bg_used_dirs_count_lo; /* Directories count */ 303 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 304 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 305 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 306 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 307 __le16 bg_itable_unused_lo; /* Unused inodes count */ 308 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 309 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 310 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 311 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 312 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 313 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 314 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 315 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 316 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 317 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 318 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 319 __u32 bg_reserved; 320 }; 321 322 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 323 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 324 sizeof(__le16)) 325 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 326 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 327 sizeof(__le16)) 328 329 /* 330 * Structure of a flex block group info 331 */ 332 333 struct flex_groups { 334 atomic64_t free_clusters; 335 atomic_t free_inodes; 336 atomic_t used_dirs; 337 }; 338 339 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 340 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 341 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 342 343 /* 344 * Macro-instructions used to manage group descriptors 345 */ 346 #define EXT4_MIN_DESC_SIZE 32 347 #define EXT4_MIN_DESC_SIZE_64BIT 64 348 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 349 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 350 #ifdef __KERNEL__ 351 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 352 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 353 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 354 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 355 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 356 #else 357 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 358 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 359 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 360 #endif 361 362 /* 363 * Constants relative to the data blocks 364 */ 365 #define EXT4_NDIR_BLOCKS 12 366 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 367 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 368 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 369 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 370 371 /* 372 * Inode flags 373 */ 374 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 375 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 376 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 377 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 378 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 379 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 380 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 381 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 382 /* Reserved for compression usage... */ 383 #define EXT4_DIRTY_FL 0x00000100 384 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 385 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 386 /* nb: was previously EXT2_ECOMPR_FL */ 387 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 388 /* End compression flags --- maybe not all used */ 389 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 390 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 391 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 392 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 393 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 394 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 395 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 396 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 397 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 398 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 399 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 400 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 401 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 402 403 #define EXT4_FL_USER_VISIBLE 0x304BDFFF /* User visible flags */ 404 #define EXT4_FL_USER_MODIFIABLE 0x204BC0FF /* User modifiable flags */ 405 406 /* Flags we can manipulate with through EXT4_IOC_FSSETXATTR */ 407 #define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \ 408 EXT4_IMMUTABLE_FL | \ 409 EXT4_APPEND_FL | \ 410 EXT4_NODUMP_FL | \ 411 EXT4_NOATIME_FL | \ 412 EXT4_PROJINHERIT_FL) 413 414 /* Flags that should be inherited by new inodes from their parent. */ 415 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 416 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 417 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 418 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 419 EXT4_PROJINHERIT_FL) 420 421 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 422 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 423 424 /* Flags that are appropriate for non-directories/regular files. */ 425 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 426 427 /* Mask out flags that are inappropriate for the given type of inode. */ 428 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 429 { 430 if (S_ISDIR(mode)) 431 return flags; 432 else if (S_ISREG(mode)) 433 return flags & EXT4_REG_FLMASK; 434 else 435 return flags & EXT4_OTHER_FLMASK; 436 } 437 438 /* 439 * Inode flags used for atomic set/get 440 */ 441 enum { 442 EXT4_INODE_SECRM = 0, /* Secure deletion */ 443 EXT4_INODE_UNRM = 1, /* Undelete */ 444 EXT4_INODE_COMPR = 2, /* Compress file */ 445 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 446 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 447 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 448 EXT4_INODE_NODUMP = 6, /* do not dump file */ 449 EXT4_INODE_NOATIME = 7, /* do not update atime */ 450 /* Reserved for compression usage... */ 451 EXT4_INODE_DIRTY = 8, 452 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 453 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 454 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 455 /* End compression flags --- maybe not all used */ 456 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 457 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 458 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 459 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 460 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 461 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 462 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 463 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 464 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 465 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 466 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 467 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 468 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 469 }; 470 471 /* 472 * Since it's pretty easy to mix up bit numbers and hex values, we use a 473 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 474 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 475 * any extra space in the compiled kernel image, otherwise, the build will fail. 476 * It's important that these values are the same, since we are using 477 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 478 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 479 * values found in ext2, ext3 and ext4 filesystems, and of course the values 480 * defined in e2fsprogs. 481 * 482 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 483 */ 484 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 485 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 486 487 static inline void ext4_check_flag_values(void) 488 { 489 CHECK_FLAG_VALUE(SECRM); 490 CHECK_FLAG_VALUE(UNRM); 491 CHECK_FLAG_VALUE(COMPR); 492 CHECK_FLAG_VALUE(SYNC); 493 CHECK_FLAG_VALUE(IMMUTABLE); 494 CHECK_FLAG_VALUE(APPEND); 495 CHECK_FLAG_VALUE(NODUMP); 496 CHECK_FLAG_VALUE(NOATIME); 497 CHECK_FLAG_VALUE(DIRTY); 498 CHECK_FLAG_VALUE(COMPRBLK); 499 CHECK_FLAG_VALUE(NOCOMPR); 500 CHECK_FLAG_VALUE(ENCRYPT); 501 CHECK_FLAG_VALUE(INDEX); 502 CHECK_FLAG_VALUE(IMAGIC); 503 CHECK_FLAG_VALUE(JOURNAL_DATA); 504 CHECK_FLAG_VALUE(NOTAIL); 505 CHECK_FLAG_VALUE(DIRSYNC); 506 CHECK_FLAG_VALUE(TOPDIR); 507 CHECK_FLAG_VALUE(HUGE_FILE); 508 CHECK_FLAG_VALUE(EXTENTS); 509 CHECK_FLAG_VALUE(EA_INODE); 510 CHECK_FLAG_VALUE(EOFBLOCKS); 511 CHECK_FLAG_VALUE(INLINE_DATA); 512 CHECK_FLAG_VALUE(PROJINHERIT); 513 CHECK_FLAG_VALUE(RESERVED); 514 } 515 516 /* Used to pass group descriptor data when online resize is done */ 517 struct ext4_new_group_input { 518 __u32 group; /* Group number for this data */ 519 __u64 block_bitmap; /* Absolute block number of block bitmap */ 520 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 521 __u64 inode_table; /* Absolute block number of inode table start */ 522 __u32 blocks_count; /* Total number of blocks in this group */ 523 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 524 __u16 unused; 525 }; 526 527 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 528 struct compat_ext4_new_group_input { 529 u32 group; 530 compat_u64 block_bitmap; 531 compat_u64 inode_bitmap; 532 compat_u64 inode_table; 533 u32 blocks_count; 534 u16 reserved_blocks; 535 u16 unused; 536 }; 537 #endif 538 539 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 540 struct ext4_new_group_data { 541 __u32 group; 542 __u64 block_bitmap; 543 __u64 inode_bitmap; 544 __u64 inode_table; 545 __u32 blocks_count; 546 __u16 reserved_blocks; 547 __u16 unused; 548 __u32 free_blocks_count; 549 }; 550 551 /* Indexes used to index group tables in ext4_new_group_data */ 552 enum { 553 BLOCK_BITMAP = 0, /* block bitmap */ 554 INODE_BITMAP, /* inode bitmap */ 555 INODE_TABLE, /* inode tables */ 556 GROUP_TABLE_COUNT, 557 }; 558 559 /* 560 * Flags used by ext4_map_blocks() 561 */ 562 /* Allocate any needed blocks and/or convert an unwritten 563 extent to be an initialized ext4 */ 564 #define EXT4_GET_BLOCKS_CREATE 0x0001 565 /* Request the creation of an unwritten extent */ 566 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 567 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 568 EXT4_GET_BLOCKS_CREATE) 569 /* Caller is from the delayed allocation writeout path 570 * finally doing the actual allocation of delayed blocks */ 571 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 572 /* caller is from the direct IO path, request to creation of an 573 unwritten extents if not allocated, split the unwritten 574 extent if blocks has been preallocated already*/ 575 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 576 #define EXT4_GET_BLOCKS_CONVERT 0x0010 577 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 578 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 579 /* Convert extent to initialized after IO complete */ 580 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 581 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 582 /* Eventual metadata allocation (due to growing extent tree) 583 * should not fail, so try to use reserved blocks for that.*/ 584 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 585 /* Don't normalize allocation size (used for fallocate) */ 586 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 587 /* Request will not result in inode size update (user for fallocate) */ 588 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 589 /* Convert written extents to unwritten */ 590 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 591 /* Write zeros to newly created written extents */ 592 #define EXT4_GET_BLOCKS_ZERO 0x0200 593 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 594 EXT4_GET_BLOCKS_ZERO) 595 /* Caller will submit data before dropping transaction handle. This 596 * allows jbd2 to avoid submitting data before commit. */ 597 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 598 599 /* 600 * The bit position of these flags must not overlap with any of the 601 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 602 * read_extent_tree_block(), ext4_split_extent_at(), 603 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 604 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 605 * caching the extents when reading from the extent tree while a 606 * truncate or punch hole operation is in progress. 607 */ 608 #define EXT4_EX_NOCACHE 0x40000000 609 #define EXT4_EX_FORCE_CACHE 0x20000000 610 611 /* 612 * Flags used by ext4_free_blocks 613 */ 614 #define EXT4_FREE_BLOCKS_METADATA 0x0001 615 #define EXT4_FREE_BLOCKS_FORGET 0x0002 616 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 617 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 618 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 619 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 620 621 /* 622 * ioctl commands 623 */ 624 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 625 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 626 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 627 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 628 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 629 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 630 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 631 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 632 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 633 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 634 #define EXT4_IOC_MIGRATE _IO('f', 9) 635 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 636 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 637 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 638 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 639 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 640 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 641 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 642 #define EXT4_IOC_SET_ENCRYPTION_POLICY FS_IOC_SET_ENCRYPTION_POLICY 643 #define EXT4_IOC_GET_ENCRYPTION_PWSALT FS_IOC_GET_ENCRYPTION_PWSALT 644 #define EXT4_IOC_GET_ENCRYPTION_POLICY FS_IOC_GET_ENCRYPTION_POLICY 645 646 #ifndef FS_IOC_FSGETXATTR 647 /* Until the uapi changes get merged for project quota... */ 648 649 #define FS_IOC_FSGETXATTR _IOR('X', 31, struct fsxattr) 650 #define FS_IOC_FSSETXATTR _IOW('X', 32, struct fsxattr) 651 652 /* 653 * Structure for FS_IOC_FSGETXATTR and FS_IOC_FSSETXATTR. 654 */ 655 struct fsxattr { 656 __u32 fsx_xflags; /* xflags field value (get/set) */ 657 __u32 fsx_extsize; /* extsize field value (get/set)*/ 658 __u32 fsx_nextents; /* nextents field value (get) */ 659 __u32 fsx_projid; /* project identifier (get/set) */ 660 unsigned char fsx_pad[12]; 661 }; 662 663 /* 664 * Flags for the fsx_xflags field 665 */ 666 #define FS_XFLAG_REALTIME 0x00000001 /* data in realtime volume */ 667 #define FS_XFLAG_PREALLOC 0x00000002 /* preallocated file extents */ 668 #define FS_XFLAG_IMMUTABLE 0x00000008 /* file cannot be modified */ 669 #define FS_XFLAG_APPEND 0x00000010 /* all writes append */ 670 #define FS_XFLAG_SYNC 0x00000020 /* all writes synchronous */ 671 #define FS_XFLAG_NOATIME 0x00000040 /* do not update access time */ 672 #define FS_XFLAG_NODUMP 0x00000080 /* do not include in backups */ 673 #define FS_XFLAG_RTINHERIT 0x00000100 /* create with rt bit set */ 674 #define FS_XFLAG_PROJINHERIT 0x00000200 /* create with parents projid */ 675 #define FS_XFLAG_NOSYMLINKS 0x00000400 /* disallow symlink creation */ 676 #define FS_XFLAG_EXTSIZE 0x00000800 /* extent size allocator hint */ 677 #define FS_XFLAG_EXTSZINHERIT 0x00001000 /* inherit inode extent size */ 678 #define FS_XFLAG_NODEFRAG 0x00002000 /* do not defragment */ 679 #define FS_XFLAG_FILESTREAM 0x00004000 /* use filestream allocator */ 680 #define FS_XFLAG_HASATTR 0x80000000 /* no DIFLAG for this */ 681 #endif /* !defined(FS_IOC_FSGETXATTR) */ 682 683 #define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR 684 #define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR 685 686 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32) 687 688 /* 689 * Flags for going down operation 690 */ 691 #define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */ 692 #define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */ 693 #define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */ 694 695 696 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 697 /* 698 * ioctl commands in 32 bit emulation 699 */ 700 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 701 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 702 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 703 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 704 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 705 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 706 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 707 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 708 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 709 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 710 #endif 711 712 /* Max physical block we can address w/o extents */ 713 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 714 715 /* 716 * Structure of an inode on the disk 717 */ 718 struct ext4_inode { 719 __le16 i_mode; /* File mode */ 720 __le16 i_uid; /* Low 16 bits of Owner Uid */ 721 __le32 i_size_lo; /* Size in bytes */ 722 __le32 i_atime; /* Access time */ 723 __le32 i_ctime; /* Inode Change time */ 724 __le32 i_mtime; /* Modification time */ 725 __le32 i_dtime; /* Deletion Time */ 726 __le16 i_gid; /* Low 16 bits of Group Id */ 727 __le16 i_links_count; /* Links count */ 728 __le32 i_blocks_lo; /* Blocks count */ 729 __le32 i_flags; /* File flags */ 730 union { 731 struct { 732 __le32 l_i_version; 733 } linux1; 734 struct { 735 __u32 h_i_translator; 736 } hurd1; 737 struct { 738 __u32 m_i_reserved1; 739 } masix1; 740 } osd1; /* OS dependent 1 */ 741 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 742 __le32 i_generation; /* File version (for NFS) */ 743 __le32 i_file_acl_lo; /* File ACL */ 744 __le32 i_size_high; 745 __le32 i_obso_faddr; /* Obsoleted fragment address */ 746 union { 747 struct { 748 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 749 __le16 l_i_file_acl_high; 750 __le16 l_i_uid_high; /* these 2 fields */ 751 __le16 l_i_gid_high; /* were reserved2[0] */ 752 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 753 __le16 l_i_reserved; 754 } linux2; 755 struct { 756 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 757 __u16 h_i_mode_high; 758 __u16 h_i_uid_high; 759 __u16 h_i_gid_high; 760 __u32 h_i_author; 761 } hurd2; 762 struct { 763 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 764 __le16 m_i_file_acl_high; 765 __u32 m_i_reserved2[2]; 766 } masix2; 767 } osd2; /* OS dependent 2 */ 768 __le16 i_extra_isize; 769 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 770 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 771 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 772 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 773 __le32 i_crtime; /* File Creation time */ 774 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 775 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 776 __le32 i_projid; /* Project ID */ 777 }; 778 779 struct move_extent { 780 __u32 reserved; /* should be zero */ 781 __u32 donor_fd; /* donor file descriptor */ 782 __u64 orig_start; /* logical start offset in block for orig */ 783 __u64 donor_start; /* logical start offset in block for donor */ 784 __u64 len; /* block length to be moved */ 785 __u64 moved_len; /* moved block length */ 786 }; 787 788 #define EXT4_EPOCH_BITS 2 789 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 790 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 791 792 /* 793 * Extended fields will fit into an inode if the filesystem was formatted 794 * with large inodes (-I 256 or larger) and there are not currently any EAs 795 * consuming all of the available space. For new inodes we always reserve 796 * enough space for the kernel's known extended fields, but for inodes 797 * created with an old kernel this might not have been the case. None of 798 * the extended inode fields is critical for correct filesystem operation. 799 * This macro checks if a certain field fits in the inode. Note that 800 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 801 */ 802 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 803 ((offsetof(typeof(*ext4_inode), field) + \ 804 sizeof((ext4_inode)->field)) \ 805 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 806 (einode)->i_extra_isize)) \ 807 808 /* 809 * We use an encoding that preserves the times for extra epoch "00": 810 * 811 * extra msb of adjust for signed 812 * epoch 32-bit 32-bit tv_sec to 813 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 814 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 815 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 816 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 817 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 818 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 819 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 820 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 821 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 822 * 823 * Note that previous versions of the kernel on 64-bit systems would 824 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 825 * 1970. e2fsck will correct this, assuming that it is run on the 826 * affected filesystem before 2242. 827 */ 828 829 static inline __le32 ext4_encode_extra_time(struct timespec *time) 830 { 831 u32 extra = sizeof(time->tv_sec) > 4 ? 832 ((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK : 0; 833 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); 834 } 835 836 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 837 { 838 if (unlikely(sizeof(time->tv_sec) > 4 && 839 (extra & cpu_to_le32(EXT4_EPOCH_MASK)))) { 840 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,20,0) 841 /* Handle legacy encoding of pre-1970 dates with epoch 842 * bits 1,1. We assume that by kernel version 4.20, 843 * everyone will have run fsck over the affected 844 * filesystems to correct the problem. (This 845 * backwards compatibility may be removed before this 846 * time, at the discretion of the ext4 developers.) 847 */ 848 u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK; 849 if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0) 850 extra_bits = 0; 851 time->tv_sec += extra_bits << 32; 852 #else 853 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 854 #endif 855 } 856 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 857 } 858 859 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 860 do { \ 861 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 862 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 863 (raw_inode)->xtime ## _extra = \ 864 ext4_encode_extra_time(&(inode)->xtime); \ 865 } while (0) 866 867 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 868 do { \ 869 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 870 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 871 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 872 (raw_inode)->xtime ## _extra = \ 873 ext4_encode_extra_time(&(einode)->xtime); \ 874 } while (0) 875 876 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 877 do { \ 878 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 879 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 880 ext4_decode_extra_time(&(inode)->xtime, \ 881 raw_inode->xtime ## _extra); \ 882 else \ 883 (inode)->xtime.tv_nsec = 0; \ 884 } while (0) 885 886 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 887 do { \ 888 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 889 (einode)->xtime.tv_sec = \ 890 (signed)le32_to_cpu((raw_inode)->xtime); \ 891 else \ 892 (einode)->xtime.tv_sec = 0; \ 893 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 894 ext4_decode_extra_time(&(einode)->xtime, \ 895 raw_inode->xtime ## _extra); \ 896 else \ 897 (einode)->xtime.tv_nsec = 0; \ 898 } while (0) 899 900 #define i_disk_version osd1.linux1.l_i_version 901 902 #if defined(__KERNEL__) || defined(__linux__) 903 #define i_reserved1 osd1.linux1.l_i_reserved1 904 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 905 #define i_blocks_high osd2.linux2.l_i_blocks_high 906 #define i_uid_low i_uid 907 #define i_gid_low i_gid 908 #define i_uid_high osd2.linux2.l_i_uid_high 909 #define i_gid_high osd2.linux2.l_i_gid_high 910 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 911 912 #elif defined(__GNU__) 913 914 #define i_translator osd1.hurd1.h_i_translator 915 #define i_uid_high osd2.hurd2.h_i_uid_high 916 #define i_gid_high osd2.hurd2.h_i_gid_high 917 #define i_author osd2.hurd2.h_i_author 918 919 #elif defined(__masix__) 920 921 #define i_reserved1 osd1.masix1.m_i_reserved1 922 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 923 #define i_reserved2 osd2.masix2.m_i_reserved2 924 925 #endif /* defined(__KERNEL__) || defined(__linux__) */ 926 927 #include "extents_status.h" 928 929 /* 930 * Lock subclasses for i_data_sem in the ext4_inode_info structure. 931 * 932 * These are needed to avoid lockdep false positives when we need to 933 * allocate blocks to the quota inode during ext4_map_blocks(), while 934 * holding i_data_sem for a normal (non-quota) inode. Since we don't 935 * do quota tracking for the quota inode, this avoids deadlock (as 936 * well as infinite recursion, since it isn't turtles all the way 937 * down...) 938 * 939 * I_DATA_SEM_NORMAL - Used for most inodes 940 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode 941 * where the second inode has larger inode number 942 * than the first 943 * I_DATA_SEM_QUOTA - Used for quota inodes only 944 */ 945 enum { 946 I_DATA_SEM_NORMAL = 0, 947 I_DATA_SEM_OTHER, 948 I_DATA_SEM_QUOTA, 949 }; 950 951 952 /* 953 * fourth extended file system inode data in memory 954 */ 955 struct ext4_inode_info { 956 __le32 i_data[15]; /* unconverted */ 957 __u32 i_dtime; 958 ext4_fsblk_t i_file_acl; 959 960 /* 961 * i_block_group is the number of the block group which contains 962 * this file's inode. Constant across the lifetime of the inode, 963 * it is ued for making block allocation decisions - we try to 964 * place a file's data blocks near its inode block, and new inodes 965 * near to their parent directory's inode. 966 */ 967 ext4_group_t i_block_group; 968 ext4_lblk_t i_dir_start_lookup; 969 #if (BITS_PER_LONG < 64) 970 unsigned long i_state_flags; /* Dynamic state flags */ 971 #endif 972 unsigned long i_flags; 973 974 /* 975 * Extended attributes can be read independently of the main file 976 * data. Taking i_mutex even when reading would cause contention 977 * between readers of EAs and writers of regular file data, so 978 * instead we synchronize on xattr_sem when reading or changing 979 * EAs. 980 */ 981 struct rw_semaphore xattr_sem; 982 983 struct list_head i_orphan; /* unlinked but open inodes */ 984 985 /* 986 * i_disksize keeps track of what the inode size is ON DISK, not 987 * in memory. During truncate, i_size is set to the new size by 988 * the VFS prior to calling ext4_truncate(), but the filesystem won't 989 * set i_disksize to 0 until the truncate is actually under way. 990 * 991 * The intent is that i_disksize always represents the blocks which 992 * are used by this file. This allows recovery to restart truncate 993 * on orphans if we crash during truncate. We actually write i_disksize 994 * into the on-disk inode when writing inodes out, instead of i_size. 995 * 996 * The only time when i_disksize and i_size may be different is when 997 * a truncate is in progress. The only things which change i_disksize 998 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 999 */ 1000 loff_t i_disksize; 1001 1002 /* 1003 * i_data_sem is for serialising ext4_truncate() against 1004 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 1005 * data tree are chopped off during truncate. We can't do that in 1006 * ext4 because whenever we perform intermediate commits during 1007 * truncate, the inode and all the metadata blocks *must* be in a 1008 * consistent state which allows truncation of the orphans to restart 1009 * during recovery. Hence we must fix the get_block-vs-truncate race 1010 * by other means, so we have i_data_sem. 1011 */ 1012 struct rw_semaphore i_data_sem; 1013 /* 1014 * i_mmap_sem is for serializing page faults with truncate / punch hole 1015 * operations. We have to make sure that new page cannot be faulted in 1016 * a section of the inode that is being punched. We cannot easily use 1017 * i_data_sem for this since we need protection for the whole punch 1018 * operation and i_data_sem ranks below transaction start so we have 1019 * to occasionally drop it. 1020 */ 1021 struct rw_semaphore i_mmap_sem; 1022 struct inode vfs_inode; 1023 struct jbd2_inode *jinode; 1024 1025 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 1026 1027 /* 1028 * File creation time. Its function is same as that of 1029 * struct timespec i_{a,c,m}time in the generic inode. 1030 */ 1031 struct timespec i_crtime; 1032 1033 /* mballoc */ 1034 struct list_head i_prealloc_list; 1035 spinlock_t i_prealloc_lock; 1036 1037 /* extents status tree */ 1038 struct ext4_es_tree i_es_tree; 1039 rwlock_t i_es_lock; 1040 struct list_head i_es_list; 1041 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1042 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1043 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1044 extents to shrink. Protected by 1045 i_es_lock */ 1046 1047 /* ialloc */ 1048 ext4_group_t i_last_alloc_group; 1049 1050 /* allocation reservation info for delalloc */ 1051 /* In case of bigalloc, these refer to clusters rather than blocks */ 1052 unsigned int i_reserved_data_blocks; 1053 unsigned int i_reserved_meta_blocks; 1054 unsigned int i_allocated_meta_blocks; 1055 ext4_lblk_t i_da_metadata_calc_last_lblock; 1056 int i_da_metadata_calc_len; 1057 1058 /* on-disk additional length */ 1059 __u16 i_extra_isize; 1060 1061 /* Indicate the inline data space. */ 1062 u16 i_inline_off; 1063 u16 i_inline_size; 1064 1065 #ifdef CONFIG_QUOTA 1066 /* quota space reservation, managed internally by quota code */ 1067 qsize_t i_reserved_quota; 1068 #endif 1069 1070 /* Lock protecting lists below */ 1071 spinlock_t i_completed_io_lock; 1072 /* 1073 * Completed IOs that need unwritten extents handling and have 1074 * transaction reserved 1075 */ 1076 struct list_head i_rsv_conversion_list; 1077 struct work_struct i_rsv_conversion_work; 1078 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 1079 1080 spinlock_t i_block_reservation_lock; 1081 1082 /* 1083 * Transactions that contain inode's metadata needed to complete 1084 * fsync and fdatasync, respectively. 1085 */ 1086 tid_t i_sync_tid; 1087 tid_t i_datasync_tid; 1088 1089 #ifdef CONFIG_QUOTA 1090 struct dquot *i_dquot[MAXQUOTAS]; 1091 #endif 1092 1093 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1094 __u32 i_csum_seed; 1095 1096 kprojid_t i_projid; 1097 }; 1098 1099 /* 1100 * File system states 1101 */ 1102 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1103 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1104 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1105 1106 /* 1107 * Misc. filesystem flags 1108 */ 1109 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1110 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1111 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1112 1113 /* 1114 * Mount flags set via mount options or defaults 1115 */ 1116 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1117 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1118 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1119 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1120 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1121 #define EXT4_MOUNT_ERRORS_MASK 0x00070 1122 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1123 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1124 #ifdef CONFIG_FS_DAX 1125 #define EXT4_MOUNT_DAX 0x00200 /* Direct Access */ 1126 #else 1127 #define EXT4_MOUNT_DAX 0 1128 #endif 1129 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1130 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1131 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1132 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1133 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1134 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1135 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1136 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1137 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1138 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1139 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */ 1140 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota, 1141 * enable enforcement for hidden 1142 * quota files */ 1143 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable 1144 * enforcement for hidden quota 1145 * files */ 1146 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota 1147 * enforcement */ 1148 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1149 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1150 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1151 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1152 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1153 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1154 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1155 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1156 1157 /* 1158 * Mount flags set either automatically (could not be set by mount option) 1159 * based on per file system feature or property or in special cases such as 1160 * distinguishing between explicit mount option definition and default. 1161 */ 1162 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1163 specified delalloc */ 1164 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1165 size of blocksize * 8 1166 blocks */ 1167 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1168 file systems */ 1169 1170 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1171 specified journal checksum */ 1172 1173 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1174 ~EXT4_MOUNT_##opt 1175 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1176 EXT4_MOUNT_##opt 1177 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1178 EXT4_MOUNT_##opt) 1179 1180 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1181 ~EXT4_MOUNT2_##opt 1182 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1183 EXT4_MOUNT2_##opt 1184 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1185 EXT4_MOUNT2_##opt) 1186 1187 #define ext4_test_and_set_bit __test_and_set_bit_le 1188 #define ext4_set_bit __set_bit_le 1189 #define ext4_set_bit_atomic ext2_set_bit_atomic 1190 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1191 #define ext4_clear_bit __clear_bit_le 1192 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1193 #define ext4_test_bit test_bit_le 1194 #define ext4_find_next_zero_bit find_next_zero_bit_le 1195 #define ext4_find_next_bit find_next_bit_le 1196 1197 extern void ext4_set_bits(void *bm, int cur, int len); 1198 1199 /* 1200 * Maximal mount counts between two filesystem checks 1201 */ 1202 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1203 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1204 1205 /* 1206 * Behaviour when detecting errors 1207 */ 1208 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1209 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1210 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1211 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1212 1213 /* Metadata checksum algorithm codes */ 1214 #define EXT4_CRC32C_CHKSUM 1 1215 1216 /* 1217 * Structure of the super block 1218 */ 1219 struct ext4_super_block { 1220 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1221 __le32 s_blocks_count_lo; /* Blocks count */ 1222 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1223 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1224 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1225 __le32 s_first_data_block; /* First Data Block */ 1226 __le32 s_log_block_size; /* Block size */ 1227 __le32 s_log_cluster_size; /* Allocation cluster size */ 1228 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1229 __le32 s_clusters_per_group; /* # Clusters per group */ 1230 __le32 s_inodes_per_group; /* # Inodes per group */ 1231 __le32 s_mtime; /* Mount time */ 1232 /*30*/ __le32 s_wtime; /* Write time */ 1233 __le16 s_mnt_count; /* Mount count */ 1234 __le16 s_max_mnt_count; /* Maximal mount count */ 1235 __le16 s_magic; /* Magic signature */ 1236 __le16 s_state; /* File system state */ 1237 __le16 s_errors; /* Behaviour when detecting errors */ 1238 __le16 s_minor_rev_level; /* minor revision level */ 1239 /*40*/ __le32 s_lastcheck; /* time of last check */ 1240 __le32 s_checkinterval; /* max. time between checks */ 1241 __le32 s_creator_os; /* OS */ 1242 __le32 s_rev_level; /* Revision level */ 1243 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1244 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1245 /* 1246 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1247 * 1248 * Note: the difference between the compatible feature set and 1249 * the incompatible feature set is that if there is a bit set 1250 * in the incompatible feature set that the kernel doesn't 1251 * know about, it should refuse to mount the filesystem. 1252 * 1253 * e2fsck's requirements are more strict; if it doesn't know 1254 * about a feature in either the compatible or incompatible 1255 * feature set, it must abort and not try to meddle with 1256 * things it doesn't understand... 1257 */ 1258 __le32 s_first_ino; /* First non-reserved inode */ 1259 __le16 s_inode_size; /* size of inode structure */ 1260 __le16 s_block_group_nr; /* block group # of this superblock */ 1261 __le32 s_feature_compat; /* compatible feature set */ 1262 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1263 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1264 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1265 /*78*/ char s_volume_name[16]; /* volume name */ 1266 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 1267 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1268 /* 1269 * Performance hints. Directory preallocation should only 1270 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1271 */ 1272 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1273 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1274 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1275 /* 1276 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1277 */ 1278 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1279 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1280 __le32 s_journal_dev; /* device number of journal file */ 1281 __le32 s_last_orphan; /* start of list of inodes to delete */ 1282 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1283 __u8 s_def_hash_version; /* Default hash version to use */ 1284 __u8 s_jnl_backup_type; 1285 __le16 s_desc_size; /* size of group descriptor */ 1286 /*100*/ __le32 s_default_mount_opts; 1287 __le32 s_first_meta_bg; /* First metablock block group */ 1288 __le32 s_mkfs_time; /* When the filesystem was created */ 1289 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1290 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1291 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1292 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1293 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1294 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1295 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1296 __le32 s_flags; /* Miscellaneous flags */ 1297 __le16 s_raid_stride; /* RAID stride */ 1298 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1299 __le64 s_mmp_block; /* Block for multi-mount protection */ 1300 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1301 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1302 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1303 __u8 s_encryption_level; /* versioning level for encryption */ 1304 __u8 s_reserved_pad; /* Padding to next 32bits */ 1305 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1306 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1307 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1308 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1309 snapshot's future use */ 1310 __le32 s_snapshot_list; /* inode number of the head of the 1311 on-disk snapshot list */ 1312 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1313 __le32 s_error_count; /* number of fs errors */ 1314 __le32 s_first_error_time; /* first time an error happened */ 1315 __le32 s_first_error_ino; /* inode involved in first error */ 1316 __le64 s_first_error_block; /* block involved of first error */ 1317 __u8 s_first_error_func[32]; /* function where the error happened */ 1318 __le32 s_first_error_line; /* line number where error happened */ 1319 __le32 s_last_error_time; /* most recent time of an error */ 1320 __le32 s_last_error_ino; /* inode involved in last error */ 1321 __le32 s_last_error_line; /* line number where error happened */ 1322 __le64 s_last_error_block; /* block involved of last error */ 1323 __u8 s_last_error_func[32]; /* function where the error happened */ 1324 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1325 __u8 s_mount_opts[64]; 1326 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1327 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1328 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1329 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1330 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1331 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1332 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1333 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1334 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1335 __le32 s_reserved[98]; /* Padding to the end of the block */ 1336 __le32 s_checksum; /* crc32c(superblock) */ 1337 }; 1338 1339 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1340 1341 #ifdef __KERNEL__ 1342 1343 /* 1344 * run-time mount flags 1345 */ 1346 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1347 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1348 #define EXT4_MF_TEST_DUMMY_ENCRYPTION 0x0004 1349 1350 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1351 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \ 1352 EXT4_MF_TEST_DUMMY_ENCRYPTION)) 1353 #else 1354 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0) 1355 #endif 1356 1357 /* Number of quota types we support */ 1358 #define EXT4_MAXQUOTAS 3 1359 1360 /* 1361 * fourth extended-fs super-block data in memory 1362 */ 1363 struct ext4_sb_info { 1364 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1365 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1366 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1367 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1368 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1369 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1370 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1371 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1372 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1373 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1374 unsigned long s_overhead; /* # of fs overhead clusters */ 1375 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1376 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1377 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1378 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1379 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1380 struct buffer_head **s_group_desc; 1381 unsigned int s_mount_opt; 1382 unsigned int s_mount_opt2; 1383 unsigned int s_mount_flags; 1384 unsigned int s_def_mount_opt; 1385 ext4_fsblk_t s_sb_block; 1386 atomic64_t s_resv_clusters; 1387 kuid_t s_resuid; 1388 kgid_t s_resgid; 1389 unsigned short s_mount_state; 1390 unsigned short s_pad; 1391 int s_addr_per_block_bits; 1392 int s_desc_per_block_bits; 1393 int s_inode_size; 1394 int s_first_ino; 1395 unsigned int s_inode_readahead_blks; 1396 unsigned int s_inode_goal; 1397 spinlock_t s_next_gen_lock; 1398 u32 s_next_generation; 1399 u32 s_hash_seed[4]; 1400 int s_def_hash_version; 1401 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1402 struct percpu_counter s_freeclusters_counter; 1403 struct percpu_counter s_freeinodes_counter; 1404 struct percpu_counter s_dirs_counter; 1405 struct percpu_counter s_dirtyclusters_counter; 1406 struct blockgroup_lock *s_blockgroup_lock; 1407 struct proc_dir_entry *s_proc; 1408 struct kobject s_kobj; 1409 struct completion s_kobj_unregister; 1410 struct super_block *s_sb; 1411 1412 /* Journaling */ 1413 struct journal_s *s_journal; 1414 struct list_head s_orphan; 1415 struct mutex s_orphan_lock; 1416 unsigned long s_ext4_flags; /* Ext4 superblock flags */ 1417 unsigned long s_commit_interval; 1418 u32 s_max_batch_time; 1419 u32 s_min_batch_time; 1420 struct block_device *journal_bdev; 1421 #ifdef CONFIG_QUOTA 1422 char *s_qf_names[EXT4_MAXQUOTAS]; /* Names of quota files with journalled quota */ 1423 int s_jquota_fmt; /* Format of quota to use */ 1424 #endif 1425 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1426 struct rb_root system_blks; 1427 1428 #ifdef EXTENTS_STATS 1429 /* ext4 extents stats */ 1430 unsigned long s_ext_min; 1431 unsigned long s_ext_max; 1432 unsigned long s_depth_max; 1433 spinlock_t s_ext_stats_lock; 1434 unsigned long s_ext_blocks; 1435 unsigned long s_ext_extents; 1436 #endif 1437 1438 /* for buddy allocator */ 1439 struct ext4_group_info ***s_group_info; 1440 struct inode *s_buddy_cache; 1441 spinlock_t s_md_lock; 1442 unsigned short *s_mb_offsets; 1443 unsigned int *s_mb_maxs; 1444 unsigned int s_group_info_size; 1445 unsigned int s_mb_free_pending; 1446 1447 /* tunables */ 1448 unsigned long s_stripe; 1449 unsigned int s_mb_stream_request; 1450 unsigned int s_mb_max_to_scan; 1451 unsigned int s_mb_min_to_scan; 1452 unsigned int s_mb_stats; 1453 unsigned int s_mb_order2_reqs; 1454 unsigned int s_mb_group_prealloc; 1455 unsigned int s_max_dir_size_kb; 1456 /* where last allocation was done - for stream allocation */ 1457 unsigned long s_mb_last_group; 1458 unsigned long s_mb_last_start; 1459 1460 /* stats for buddy allocator */ 1461 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1462 atomic_t s_bal_success; /* we found long enough chunks */ 1463 atomic_t s_bal_allocated; /* in blocks */ 1464 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1465 atomic_t s_bal_goals; /* goal hits */ 1466 atomic_t s_bal_breaks; /* too long searches */ 1467 atomic_t s_bal_2orders; /* 2^order hits */ 1468 spinlock_t s_bal_lock; 1469 unsigned long s_mb_buddies_generated; 1470 unsigned long long s_mb_generation_time; 1471 atomic_t s_mb_lost_chunks; 1472 atomic_t s_mb_preallocated; 1473 atomic_t s_mb_discarded; 1474 atomic_t s_lock_busy; 1475 1476 /* locality groups */ 1477 struct ext4_locality_group __percpu *s_locality_groups; 1478 1479 /* for write statistics */ 1480 unsigned long s_sectors_written_start; 1481 u64 s_kbytes_written; 1482 1483 /* the size of zero-out chunk */ 1484 unsigned int s_extent_max_zeroout_kb; 1485 1486 unsigned int s_log_groups_per_flex; 1487 struct flex_groups *s_flex_groups; 1488 ext4_group_t s_flex_groups_allocated; 1489 1490 /* workqueue for reserved extent conversions (buffered io) */ 1491 struct workqueue_struct *rsv_conversion_wq; 1492 1493 /* timer for periodic error stats printing */ 1494 struct timer_list s_err_report; 1495 1496 /* Lazy inode table initialization info */ 1497 struct ext4_li_request *s_li_request; 1498 /* Wait multiplier for lazy initialization thread */ 1499 unsigned int s_li_wait_mult; 1500 1501 /* Kernel thread for multiple mount protection */ 1502 struct task_struct *s_mmp_tsk; 1503 1504 /* record the last minlen when FITRIM is called. */ 1505 atomic_t s_last_trim_minblks; 1506 1507 /* Reference to checksum algorithm driver via cryptoapi */ 1508 struct crypto_shash *s_chksum_driver; 1509 1510 /* Precomputed FS UUID checksum for seeding other checksums */ 1511 __u32 s_csum_seed; 1512 1513 /* Reclaim extents from extent status tree */ 1514 struct shrinker s_es_shrinker; 1515 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1516 long s_es_nr_inode; 1517 struct ext4_es_stats s_es_stats; 1518 struct mb_cache *s_mb_cache; 1519 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1520 1521 /* Ratelimit ext4 messages. */ 1522 struct ratelimit_state s_err_ratelimit_state; 1523 struct ratelimit_state s_warning_ratelimit_state; 1524 struct ratelimit_state s_msg_ratelimit_state; 1525 1526 /* Barrier between changing inodes' journal flags and writepages ops. */ 1527 struct percpu_rw_semaphore s_journal_flag_rwsem; 1528 }; 1529 1530 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1531 { 1532 return sb->s_fs_info; 1533 } 1534 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1535 { 1536 return container_of(inode, struct ext4_inode_info, vfs_inode); 1537 } 1538 1539 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1540 { 1541 return ino == EXT4_ROOT_INO || 1542 ino == EXT4_USR_QUOTA_INO || 1543 ino == EXT4_GRP_QUOTA_INO || 1544 ino == EXT4_BOOT_LOADER_INO || 1545 ino == EXT4_JOURNAL_INO || 1546 ino == EXT4_RESIZE_INO || 1547 (ino >= EXT4_FIRST_INO(sb) && 1548 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1549 } 1550 1551 /* 1552 * Inode dynamic state flags 1553 */ 1554 enum { 1555 EXT4_STATE_JDATA, /* journaled data exists */ 1556 EXT4_STATE_NEW, /* inode is newly created */ 1557 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1558 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1559 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1560 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1561 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1562 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1563 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read 1564 nolocking */ 1565 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1566 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1567 }; 1568 1569 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1570 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1571 { \ 1572 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1573 } \ 1574 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1575 { \ 1576 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1577 } \ 1578 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1579 { \ 1580 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1581 } 1582 1583 /* Add these declarations here only so that these functions can be 1584 * found by name. Otherwise, they are very hard to locate. */ 1585 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1586 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1587 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1588 EXT4_INODE_BIT_FNS(flag, flags, 0) 1589 1590 /* Add these declarations here only so that these functions can be 1591 * found by name. Otherwise, they are very hard to locate. */ 1592 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1593 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1594 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1595 #if (BITS_PER_LONG < 64) 1596 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1597 1598 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1599 { 1600 (ei)->i_state_flags = 0; 1601 } 1602 #else 1603 EXT4_INODE_BIT_FNS(state, flags, 32) 1604 1605 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1606 { 1607 /* We depend on the fact that callers will set i_flags */ 1608 } 1609 #endif 1610 #else 1611 /* Assume that user mode programs are passing in an ext4fs superblock, not 1612 * a kernel struct super_block. This will allow us to call the feature-test 1613 * macros from user land. */ 1614 #define EXT4_SB(sb) (sb) 1615 #endif 1616 1617 /* 1618 * Returns true if the inode is inode is encrypted 1619 */ 1620 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1621 1622 /* 1623 * Codes for operating systems 1624 */ 1625 #define EXT4_OS_LINUX 0 1626 #define EXT4_OS_HURD 1 1627 #define EXT4_OS_MASIX 2 1628 #define EXT4_OS_FREEBSD 3 1629 #define EXT4_OS_LITES 4 1630 1631 /* 1632 * Revision levels 1633 */ 1634 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1635 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1636 1637 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1638 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1639 1640 #define EXT4_GOOD_OLD_INODE_SIZE 128 1641 1642 /* 1643 * Feature set definitions 1644 */ 1645 1646 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1647 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1648 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1649 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1650 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1651 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1652 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1653 1654 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1655 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1656 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1657 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1658 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1659 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1660 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1661 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1662 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1663 /* 1664 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1665 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1666 * all other data structures' checksums. However, the METADATA_CSUM and 1667 * GDT_CSUM bits are mutually exclusive. 1668 */ 1669 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1670 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1671 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 1672 1673 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1674 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1675 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1676 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1677 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1678 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1679 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1680 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1681 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1682 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1683 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1684 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 1685 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1686 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1687 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1688 1689 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 1690 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1691 { \ 1692 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1693 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 1694 } \ 1695 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1696 { \ 1697 EXT4_SB(sb)->s_es->s_feature_compat |= \ 1698 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1699 } \ 1700 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1701 { \ 1702 EXT4_SB(sb)->s_es->s_feature_compat &= \ 1703 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1704 } 1705 1706 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 1707 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1708 { \ 1709 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1710 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 1711 } \ 1712 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1713 { \ 1714 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 1715 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1716 } \ 1717 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1718 { \ 1719 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 1720 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1721 } 1722 1723 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 1724 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1725 { \ 1726 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1727 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 1728 } \ 1729 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1730 { \ 1731 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 1732 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1733 } \ 1734 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1735 { \ 1736 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 1737 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1738 } 1739 1740 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 1741 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 1742 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 1743 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 1744 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 1745 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 1746 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 1747 1748 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 1749 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 1750 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 1751 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 1752 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 1753 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 1754 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 1755 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 1756 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 1757 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 1758 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 1759 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 1760 1761 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 1762 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 1763 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 1764 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 1765 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 1766 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 1767 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 1768 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 1769 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 1770 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 1771 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 1772 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 1773 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 1774 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 1775 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 1776 1777 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1778 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1779 EXT4_FEATURE_INCOMPAT_META_BG) 1780 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1781 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1782 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1783 1784 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1785 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1786 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1787 EXT4_FEATURE_INCOMPAT_META_BG) 1788 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1789 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1790 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1791 1792 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1793 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1794 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1795 EXT4_FEATURE_INCOMPAT_META_BG| \ 1796 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1797 EXT4_FEATURE_INCOMPAT_64BIT| \ 1798 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1799 EXT4_FEATURE_INCOMPAT_MMP | \ 1800 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 1801 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 1802 EXT4_FEATURE_INCOMPAT_CSUM_SEED) 1803 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1804 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1805 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1806 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1807 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1808 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1809 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1810 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1811 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1812 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 1813 EXT4_FEATURE_RO_COMPAT_PROJECT) 1814 1815 #define EXTN_FEATURE_FUNCS(ver) \ 1816 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 1817 { \ 1818 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1819 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 1820 } \ 1821 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 1822 { \ 1823 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1824 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 1825 } \ 1826 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 1827 { \ 1828 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1829 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 1830 } 1831 1832 EXTN_FEATURE_FUNCS(2) 1833 EXTN_FEATURE_FUNCS(3) 1834 EXTN_FEATURE_FUNCS(4) 1835 1836 static inline bool ext4_has_compat_features(struct super_block *sb) 1837 { 1838 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 1839 } 1840 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 1841 { 1842 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 1843 } 1844 static inline bool ext4_has_incompat_features(struct super_block *sb) 1845 { 1846 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 1847 } 1848 1849 /* 1850 * Superblock flags 1851 */ 1852 #define EXT4_FLAGS_RESIZING 0 1853 #define EXT4_FLAGS_SHUTDOWN 1 1854 1855 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi) 1856 { 1857 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 1858 } 1859 1860 1861 /* 1862 * Default values for user and/or group using reserved blocks 1863 */ 1864 #define EXT4_DEF_RESUID 0 1865 #define EXT4_DEF_RESGID 0 1866 1867 /* 1868 * Default project ID 1869 */ 1870 #define EXT4_DEF_PROJID 0 1871 1872 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1873 1874 /* 1875 * Default mount options 1876 */ 1877 #define EXT4_DEFM_DEBUG 0x0001 1878 #define EXT4_DEFM_BSDGROUPS 0x0002 1879 #define EXT4_DEFM_XATTR_USER 0x0004 1880 #define EXT4_DEFM_ACL 0x0008 1881 #define EXT4_DEFM_UID16 0x0010 1882 #define EXT4_DEFM_JMODE 0x0060 1883 #define EXT4_DEFM_JMODE_DATA 0x0020 1884 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1885 #define EXT4_DEFM_JMODE_WBACK 0x0060 1886 #define EXT4_DEFM_NOBARRIER 0x0100 1887 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1888 #define EXT4_DEFM_DISCARD 0x0400 1889 #define EXT4_DEFM_NODELALLOC 0x0800 1890 1891 /* 1892 * Default journal batch times 1893 */ 1894 #define EXT4_DEF_MIN_BATCH_TIME 0 1895 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1896 1897 /* 1898 * Minimum number of groups in a flexgroup before we separate out 1899 * directories into the first block group of a flexgroup 1900 */ 1901 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1902 1903 /* 1904 * Structure of a directory entry 1905 */ 1906 #define EXT4_NAME_LEN 255 1907 1908 struct ext4_dir_entry { 1909 __le32 inode; /* Inode number */ 1910 __le16 rec_len; /* Directory entry length */ 1911 __le16 name_len; /* Name length */ 1912 char name[EXT4_NAME_LEN]; /* File name */ 1913 }; 1914 1915 /* 1916 * The new version of the directory entry. Since EXT4 structures are 1917 * stored in intel byte order, and the name_len field could never be 1918 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1919 * file_type field. 1920 */ 1921 struct ext4_dir_entry_2 { 1922 __le32 inode; /* Inode number */ 1923 __le16 rec_len; /* Directory entry length */ 1924 __u8 name_len; /* Name length */ 1925 __u8 file_type; 1926 char name[EXT4_NAME_LEN]; /* File name */ 1927 }; 1928 1929 /* 1930 * This is a bogus directory entry at the end of each leaf block that 1931 * records checksums. 1932 */ 1933 struct ext4_dir_entry_tail { 1934 __le32 det_reserved_zero1; /* Pretend to be unused */ 1935 __le16 det_rec_len; /* 12 */ 1936 __u8 det_reserved_zero2; /* Zero name length */ 1937 __u8 det_reserved_ft; /* 0xDE, fake file type */ 1938 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1939 }; 1940 1941 #define EXT4_DIRENT_TAIL(block, blocksize) \ 1942 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 1943 ((blocksize) - \ 1944 sizeof(struct ext4_dir_entry_tail)))) 1945 1946 /* 1947 * Ext4 directory file types. Only the low 3 bits are used. The 1948 * other bits are reserved for now. 1949 */ 1950 #define EXT4_FT_UNKNOWN 0 1951 #define EXT4_FT_REG_FILE 1 1952 #define EXT4_FT_DIR 2 1953 #define EXT4_FT_CHRDEV 3 1954 #define EXT4_FT_BLKDEV 4 1955 #define EXT4_FT_FIFO 5 1956 #define EXT4_FT_SOCK 6 1957 #define EXT4_FT_SYMLINK 7 1958 1959 #define EXT4_FT_MAX 8 1960 1961 #define EXT4_FT_DIR_CSUM 0xDE 1962 1963 /* 1964 * EXT4_DIR_PAD defines the directory entries boundaries 1965 * 1966 * NOTE: It must be a multiple of 4 1967 */ 1968 #define EXT4_DIR_PAD 4 1969 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1970 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1971 ~EXT4_DIR_ROUND) 1972 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1973 1974 /* 1975 * If we ever get support for fs block sizes > page_size, we'll need 1976 * to remove the #if statements in the next two functions... 1977 */ 1978 static inline unsigned int 1979 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1980 { 1981 unsigned len = le16_to_cpu(dlen); 1982 1983 #if (PAGE_SIZE >= 65536) 1984 if (len == EXT4_MAX_REC_LEN || len == 0) 1985 return blocksize; 1986 return (len & 65532) | ((len & 3) << 16); 1987 #else 1988 return len; 1989 #endif 1990 } 1991 1992 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1993 { 1994 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1995 BUG(); 1996 #if (PAGE_SIZE >= 65536) 1997 if (len < 65536) 1998 return cpu_to_le16(len); 1999 if (len == blocksize) { 2000 if (blocksize == 65536) 2001 return cpu_to_le16(EXT4_MAX_REC_LEN); 2002 else 2003 return cpu_to_le16(0); 2004 } 2005 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 2006 #else 2007 return cpu_to_le16(len); 2008 #endif 2009 } 2010 2011 /* 2012 * Hash Tree Directory indexing 2013 * (c) Daniel Phillips, 2001 2014 */ 2015 2016 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2017 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2018 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 2019 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2020 2021 /* Legal values for the dx_root hash_version field: */ 2022 2023 #define DX_HASH_LEGACY 0 2024 #define DX_HASH_HALF_MD4 1 2025 #define DX_HASH_TEA 2 2026 #define DX_HASH_LEGACY_UNSIGNED 3 2027 #define DX_HASH_HALF_MD4_UNSIGNED 4 2028 #define DX_HASH_TEA_UNSIGNED 5 2029 2030 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 2031 const void *address, unsigned int length) 2032 { 2033 struct { 2034 struct shash_desc shash; 2035 char ctx[4]; 2036 } desc; 2037 int err; 2038 2039 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2040 2041 desc.shash.tfm = sbi->s_chksum_driver; 2042 desc.shash.flags = 0; 2043 *(u32 *)desc.ctx = crc; 2044 2045 err = crypto_shash_update(&desc.shash, address, length); 2046 BUG_ON(err); 2047 2048 return *(u32 *)desc.ctx; 2049 } 2050 2051 #ifdef __KERNEL__ 2052 2053 /* hash info structure used by the directory hash */ 2054 struct dx_hash_info 2055 { 2056 u32 hash; 2057 u32 minor_hash; 2058 int hash_version; 2059 u32 *seed; 2060 }; 2061 2062 2063 /* 32 and 64 bit signed EOF for dx directories */ 2064 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2065 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2066 2067 2068 /* 2069 * Control parameters used by ext4_htree_next_block 2070 */ 2071 #define HASH_NB_ALWAYS 1 2072 2073 struct ext4_filename { 2074 const struct qstr *usr_fname; 2075 struct fscrypt_str disk_name; 2076 struct dx_hash_info hinfo; 2077 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2078 struct fscrypt_str crypto_buf; 2079 #endif 2080 }; 2081 2082 #define fname_name(p) ((p)->disk_name.name) 2083 #define fname_len(p) ((p)->disk_name.len) 2084 2085 /* 2086 * Describe an inode's exact location on disk and in memory 2087 */ 2088 struct ext4_iloc 2089 { 2090 struct buffer_head *bh; 2091 unsigned long offset; 2092 ext4_group_t block_group; 2093 }; 2094 2095 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2096 { 2097 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2098 } 2099 2100 /* 2101 * This structure is stuffed into the struct file's private_data field 2102 * for directories. It is where we put information so that we can do 2103 * readdir operations in hash tree order. 2104 */ 2105 struct dir_private_info { 2106 struct rb_root root; 2107 struct rb_node *curr_node; 2108 struct fname *extra_fname; 2109 loff_t last_pos; 2110 __u32 curr_hash; 2111 __u32 curr_minor_hash; 2112 __u32 next_hash; 2113 }; 2114 2115 /* calculate the first block number of the group */ 2116 static inline ext4_fsblk_t 2117 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2118 { 2119 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2120 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2121 } 2122 2123 /* 2124 * Special error return code only used by dx_probe() and its callers. 2125 */ 2126 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2127 2128 /* 2129 * Timeout and state flag for lazy initialization inode thread. 2130 */ 2131 #define EXT4_DEF_LI_WAIT_MULT 10 2132 #define EXT4_DEF_LI_MAX_START_DELAY 5 2133 #define EXT4_LAZYINIT_QUIT 0x0001 2134 #define EXT4_LAZYINIT_RUNNING 0x0002 2135 2136 /* 2137 * Lazy inode table initialization info 2138 */ 2139 struct ext4_lazy_init { 2140 unsigned long li_state; 2141 struct list_head li_request_list; 2142 struct mutex li_list_mtx; 2143 }; 2144 2145 struct ext4_li_request { 2146 struct super_block *lr_super; 2147 struct ext4_sb_info *lr_sbi; 2148 ext4_group_t lr_next_group; 2149 struct list_head lr_request; 2150 unsigned long lr_next_sched; 2151 unsigned long lr_timeout; 2152 }; 2153 2154 struct ext4_features { 2155 struct kobject f_kobj; 2156 struct completion f_kobj_unregister; 2157 }; 2158 2159 /* 2160 * This structure will be used for multiple mount protection. It will be 2161 * written into the block number saved in the s_mmp_block field in the 2162 * superblock. Programs that check MMP should assume that if 2163 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2164 * to use the filesystem, regardless of how old the timestamp is. 2165 */ 2166 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2167 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2168 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2169 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2170 2171 struct mmp_struct { 2172 __le32 mmp_magic; /* Magic number for MMP */ 2173 __le32 mmp_seq; /* Sequence no. updated periodically */ 2174 2175 /* 2176 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2177 * purposes and do not affect the correctness of the algorithm 2178 */ 2179 __le64 mmp_time; /* Time last updated */ 2180 char mmp_nodename[64]; /* Node which last updated MMP block */ 2181 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2182 2183 /* 2184 * mmp_check_interval is used to verify if the MMP block has been 2185 * updated on the block device. The value is updated based on the 2186 * maximum time to write the MMP block during an update cycle. 2187 */ 2188 __le16 mmp_check_interval; 2189 2190 __le16 mmp_pad1; 2191 __le32 mmp_pad2[226]; 2192 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2193 }; 2194 2195 /* arguments passed to the mmp thread */ 2196 struct mmpd_data { 2197 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2198 struct super_block *sb; /* super block of the fs */ 2199 }; 2200 2201 /* 2202 * Check interval multiplier 2203 * The MMP block is written every update interval and initially checked every 2204 * update interval x the multiplier (the value is then adapted based on the 2205 * write latency). The reason is that writes can be delayed under load and we 2206 * don't want readers to incorrectly assume that the filesystem is no longer 2207 * in use. 2208 */ 2209 #define EXT4_MMP_CHECK_MULT 2UL 2210 2211 /* 2212 * Minimum interval for MMP checking in seconds. 2213 */ 2214 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2215 2216 /* 2217 * Maximum interval for MMP checking in seconds. 2218 */ 2219 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2220 2221 /* 2222 * Function prototypes 2223 */ 2224 2225 /* 2226 * Ok, these declarations are also in <linux/kernel.h> but none of the 2227 * ext4 source programs needs to include it so they are duplicated here. 2228 */ 2229 # define NORET_TYPE /**/ 2230 # define ATTRIB_NORET __attribute__((noreturn)) 2231 # define NORET_AND noreturn, 2232 2233 /* bitmap.c */ 2234 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2235 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2236 struct ext4_group_desc *gdp, 2237 struct buffer_head *bh, int sz); 2238 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2239 struct ext4_group_desc *gdp, 2240 struct buffer_head *bh, int sz); 2241 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2242 struct ext4_group_desc *gdp, 2243 struct buffer_head *bh); 2244 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2245 struct ext4_group_desc *gdp, 2246 struct buffer_head *bh); 2247 2248 /* balloc.c */ 2249 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2250 ext4_fsblk_t blocknr, 2251 ext4_group_t *blockgrpp, 2252 ext4_grpblk_t *offsetp); 2253 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2254 ext4_fsblk_t block); 2255 2256 extern unsigned int ext4_block_group(struct super_block *sb, 2257 ext4_fsblk_t blocknr); 2258 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2259 ext4_fsblk_t blocknr); 2260 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2261 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2262 ext4_group_t group); 2263 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2264 ext4_fsblk_t goal, 2265 unsigned int flags, 2266 unsigned long *count, 2267 int *errp); 2268 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2269 s64 nclusters, unsigned int flags); 2270 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2271 extern void ext4_check_blocks_bitmap(struct super_block *); 2272 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2273 ext4_group_t block_group, 2274 struct buffer_head ** bh); 2275 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2276 2277 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2278 ext4_group_t block_group); 2279 extern int ext4_wait_block_bitmap(struct super_block *sb, 2280 ext4_group_t block_group, 2281 struct buffer_head *bh); 2282 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2283 ext4_group_t block_group); 2284 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2285 ext4_group_t block_group, 2286 struct ext4_group_desc *gdp); 2287 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2288 2289 static inline bool ext4_encrypted_inode(struct inode *inode) 2290 { 2291 return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT); 2292 } 2293 2294 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2295 static inline int ext4_fname_setup_filename(struct inode *dir, 2296 const struct qstr *iname, 2297 int lookup, struct ext4_filename *fname) 2298 { 2299 struct fscrypt_name name; 2300 int err; 2301 2302 memset(fname, 0, sizeof(struct ext4_filename)); 2303 2304 err = fscrypt_setup_filename(dir, iname, lookup, &name); 2305 2306 fname->usr_fname = name.usr_fname; 2307 fname->disk_name = name.disk_name; 2308 fname->hinfo.hash = name.hash; 2309 fname->hinfo.minor_hash = name.minor_hash; 2310 fname->crypto_buf = name.crypto_buf; 2311 return err; 2312 } 2313 2314 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2315 { 2316 struct fscrypt_name name; 2317 2318 name.crypto_buf = fname->crypto_buf; 2319 fscrypt_free_filename(&name); 2320 2321 fname->crypto_buf.name = NULL; 2322 fname->usr_fname = NULL; 2323 fname->disk_name.name = NULL; 2324 } 2325 #else 2326 static inline int ext4_fname_setup_filename(struct inode *dir, 2327 const struct qstr *iname, 2328 int lookup, struct ext4_filename *fname) 2329 { 2330 fname->usr_fname = iname; 2331 fname->disk_name.name = (unsigned char *) iname->name; 2332 fname->disk_name.len = iname->len; 2333 return 0; 2334 } 2335 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { } 2336 2337 #endif 2338 2339 /* dir.c */ 2340 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2341 struct file *, 2342 struct ext4_dir_entry_2 *, 2343 struct buffer_head *, char *, int, 2344 unsigned int); 2345 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2346 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2347 (de), (bh), (buf), (size), (offset))) 2348 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2349 __u32 minor_hash, 2350 struct ext4_dir_entry_2 *dirent, 2351 struct fscrypt_str *ent_name); 2352 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2353 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2354 struct buffer_head *bh, 2355 void *buf, int buf_size, 2356 struct ext4_filename *fname, 2357 struct ext4_dir_entry_2 **dest_de); 2358 int ext4_insert_dentry(struct inode *dir, 2359 struct inode *inode, 2360 struct ext4_dir_entry_2 *de, 2361 int buf_size, 2362 struct ext4_filename *fname); 2363 static inline void ext4_update_dx_flag(struct inode *inode) 2364 { 2365 if (!ext4_has_feature_dir_index(inode->i_sb)) 2366 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2367 } 2368 static unsigned char ext4_filetype_table[] = { 2369 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2370 }; 2371 2372 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2373 { 2374 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2375 return DT_UNKNOWN; 2376 2377 return ext4_filetype_table[filetype]; 2378 } 2379 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2380 void *buf, int buf_size); 2381 2382 /* fsync.c */ 2383 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2384 2385 /* hash.c */ 2386 extern int ext4fs_dirhash(const char *name, int len, struct 2387 dx_hash_info *hinfo); 2388 2389 /* ialloc.c */ 2390 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2391 const struct qstr *qstr, __u32 goal, 2392 uid_t *owner, int handle_type, 2393 unsigned int line_no, int nblocks); 2394 2395 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \ 2396 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2397 0, 0, 0) 2398 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2399 type, nblocks) \ 2400 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2401 (type), __LINE__, (nblocks)) 2402 2403 2404 extern void ext4_free_inode(handle_t *, struct inode *); 2405 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2406 extern unsigned long ext4_count_free_inodes(struct super_block *); 2407 extern unsigned long ext4_count_dirs(struct super_block *); 2408 extern void ext4_check_inodes_bitmap(struct super_block *); 2409 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2410 extern int ext4_init_inode_table(struct super_block *sb, 2411 ext4_group_t group, int barrier); 2412 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2413 2414 /* mballoc.c */ 2415 extern const struct file_operations ext4_seq_mb_groups_fops; 2416 extern long ext4_mb_stats; 2417 extern long ext4_mb_max_to_scan; 2418 extern int ext4_mb_init(struct super_block *); 2419 extern int ext4_mb_release(struct super_block *); 2420 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2421 struct ext4_allocation_request *, int *); 2422 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2423 extern void ext4_discard_preallocations(struct inode *); 2424 extern int __init ext4_init_mballoc(void); 2425 extern void ext4_exit_mballoc(void); 2426 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2427 struct buffer_head *bh, ext4_fsblk_t block, 2428 unsigned long count, int flags); 2429 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2430 ext4_group_t ngroups); 2431 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2432 ext4_group_t i, struct ext4_group_desc *desc); 2433 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2434 ext4_fsblk_t block, unsigned long count); 2435 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2436 2437 /* inode.c */ 2438 int ext4_inode_is_fast_symlink(struct inode *inode); 2439 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2440 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2441 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2442 struct buffer_head *bh_result, int create); 2443 int ext4_get_block(struct inode *inode, sector_t iblock, 2444 struct buffer_head *bh_result, int create); 2445 int ext4_dio_get_block(struct inode *inode, sector_t iblock, 2446 struct buffer_head *bh_result, int create); 2447 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2448 struct buffer_head *bh, int create); 2449 int ext4_walk_page_buffers(handle_t *handle, 2450 struct buffer_head *head, 2451 unsigned from, 2452 unsigned to, 2453 int *partial, 2454 int (*fn)(handle_t *handle, 2455 struct buffer_head *bh)); 2456 int do_journal_get_write_access(handle_t *handle, 2457 struct buffer_head *bh); 2458 #define FALL_BACK_TO_NONDELALLOC 1 2459 #define CONVERT_INLINE_DATA 2 2460 2461 extern struct inode *ext4_iget(struct super_block *, unsigned long); 2462 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long); 2463 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2464 extern int ext4_setattr(struct dentry *, struct iattr *); 2465 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 2466 struct kstat *stat); 2467 extern void ext4_evict_inode(struct inode *); 2468 extern void ext4_clear_inode(struct inode *); 2469 extern int ext4_sync_inode(handle_t *, struct inode *); 2470 extern void ext4_dirty_inode(struct inode *, int); 2471 extern int ext4_change_inode_journal_flag(struct inode *, int); 2472 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2473 extern int ext4_inode_attach_jinode(struct inode *inode); 2474 extern int ext4_can_truncate(struct inode *inode); 2475 extern int ext4_truncate(struct inode *); 2476 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2477 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 2478 extern void ext4_set_inode_flags(struct inode *); 2479 extern void ext4_get_inode_flags(struct ext4_inode_info *); 2480 extern int ext4_alloc_da_blocks(struct inode *inode); 2481 extern void ext4_set_aops(struct inode *inode); 2482 extern int ext4_writepage_trans_blocks(struct inode *); 2483 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2484 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2485 loff_t lstart, loff_t lend); 2486 extern int ext4_page_mkwrite(struct vm_fault *vmf); 2487 extern int ext4_filemap_fault(struct vm_fault *vmf); 2488 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2489 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 2490 extern void ext4_da_update_reserve_space(struct inode *inode, 2491 int used, int quota_claim); 2492 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 2493 ext4_fsblk_t pblk, ext4_lblk_t len); 2494 extern int ext4_get_next_extent(struct inode *inode, ext4_lblk_t lblk, 2495 unsigned int map_len, 2496 struct extent_status *result); 2497 2498 /* indirect.c */ 2499 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2500 struct ext4_map_blocks *map, int flags); 2501 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2502 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2503 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2504 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2505 ext4_lblk_t start, ext4_lblk_t end); 2506 2507 /* ioctl.c */ 2508 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2509 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2510 2511 /* migrate.c */ 2512 extern int ext4_ext_migrate(struct inode *); 2513 extern int ext4_ind_migrate(struct inode *inode); 2514 2515 /* namei.c */ 2516 extern int ext4_dirent_csum_verify(struct inode *inode, 2517 struct ext4_dir_entry *dirent); 2518 extern int ext4_orphan_add(handle_t *, struct inode *); 2519 extern int ext4_orphan_del(handle_t *, struct inode *); 2520 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2521 __u32 start_minor_hash, __u32 *next_hash); 2522 extern int ext4_search_dir(struct buffer_head *bh, 2523 char *search_buf, 2524 int buf_size, 2525 struct inode *dir, 2526 struct ext4_filename *fname, 2527 const struct qstr *d_name, 2528 unsigned int offset, 2529 struct ext4_dir_entry_2 **res_dir); 2530 extern int ext4_generic_delete_entry(handle_t *handle, 2531 struct inode *dir, 2532 struct ext4_dir_entry_2 *de_del, 2533 struct buffer_head *bh, 2534 void *entry_buf, 2535 int buf_size, 2536 int csum_size); 2537 extern bool ext4_empty_dir(struct inode *inode); 2538 2539 /* resize.c */ 2540 extern int ext4_group_add(struct super_block *sb, 2541 struct ext4_new_group_data *input); 2542 extern int ext4_group_extend(struct super_block *sb, 2543 struct ext4_super_block *es, 2544 ext4_fsblk_t n_blocks_count); 2545 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2546 2547 /* super.c */ 2548 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 2549 extern int ext4_calculate_overhead(struct super_block *sb); 2550 extern void ext4_superblock_csum_set(struct super_block *sb); 2551 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 2552 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 2553 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2554 ext4_group_t ngroup); 2555 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2556 char nbuf[16]); 2557 2558 extern __printf(4, 5) 2559 void __ext4_error(struct super_block *, const char *, unsigned int, 2560 const char *, ...); 2561 extern __printf(5, 6) 2562 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2563 const char *, ...); 2564 extern __printf(5, 6) 2565 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2566 const char *, ...); 2567 extern void __ext4_std_error(struct super_block *, const char *, 2568 unsigned int, int); 2569 extern __printf(4, 5) 2570 void __ext4_abort(struct super_block *, const char *, unsigned int, 2571 const char *, ...); 2572 extern __printf(4, 5) 2573 void __ext4_warning(struct super_block *, const char *, unsigned int, 2574 const char *, ...); 2575 extern __printf(4, 5) 2576 void __ext4_warning_inode(const struct inode *inode, const char *function, 2577 unsigned int line, const char *fmt, ...); 2578 extern __printf(3, 4) 2579 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2580 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2581 const char *, unsigned int, const char *); 2582 extern __printf(7, 8) 2583 void __ext4_grp_locked_error(const char *, unsigned int, 2584 struct super_block *, ext4_group_t, 2585 unsigned long, ext4_fsblk_t, 2586 const char *, ...); 2587 2588 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 2589 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 2590 2591 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 2592 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 2593 2594 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 2595 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 2596 2597 #ifdef CONFIG_PRINTK 2598 2599 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2600 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__) 2601 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2602 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2603 #define ext4_error(sb, fmt, ...) \ 2604 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2605 #define ext4_abort(sb, fmt, ...) \ 2606 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2607 #define ext4_warning(sb, fmt, ...) \ 2608 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2609 #define ext4_warning_inode(inode, fmt, ...) \ 2610 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 2611 #define ext4_msg(sb, level, fmt, ...) \ 2612 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 2613 #define dump_mmp_msg(sb, mmp, msg) \ 2614 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 2615 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2616 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 2617 fmt, ##__VA_ARGS__) 2618 2619 #else 2620 2621 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2622 do { \ 2623 no_printk(fmt, ##__VA_ARGS__); \ 2624 __ext4_error_inode(inode, "", 0, block, " "); \ 2625 } while (0) 2626 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2627 do { \ 2628 no_printk(fmt, ##__VA_ARGS__); \ 2629 __ext4_error_file(file, "", 0, block, " "); \ 2630 } while (0) 2631 #define ext4_error(sb, fmt, ...) \ 2632 do { \ 2633 no_printk(fmt, ##__VA_ARGS__); \ 2634 __ext4_error(sb, "", 0, " "); \ 2635 } while (0) 2636 #define ext4_abort(sb, fmt, ...) \ 2637 do { \ 2638 no_printk(fmt, ##__VA_ARGS__); \ 2639 __ext4_abort(sb, "", 0, " "); \ 2640 } while (0) 2641 #define ext4_warning(sb, fmt, ...) \ 2642 do { \ 2643 no_printk(fmt, ##__VA_ARGS__); \ 2644 __ext4_warning(sb, "", 0, " "); \ 2645 } while (0) 2646 #define ext4_warning_inode(inode, fmt, ...) \ 2647 do { \ 2648 no_printk(fmt, ##__VA_ARGS__); \ 2649 __ext4_warning_inode(inode, "", 0, " "); \ 2650 } while (0) 2651 #define ext4_msg(sb, level, fmt, ...) \ 2652 do { \ 2653 no_printk(fmt, ##__VA_ARGS__); \ 2654 __ext4_msg(sb, "", " "); \ 2655 } while (0) 2656 #define dump_mmp_msg(sb, mmp, msg) \ 2657 __dump_mmp_msg(sb, mmp, "", 0, "") 2658 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2659 do { \ 2660 no_printk(fmt, ##__VA_ARGS__); \ 2661 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 2662 } while (0) 2663 2664 #endif 2665 2666 extern void ext4_update_dynamic_rev(struct super_block *sb); 2667 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2668 __u32 compat); 2669 extern int ext4_update_rocompat_feature(handle_t *handle, 2670 struct super_block *sb, __u32 rocompat); 2671 extern int ext4_update_incompat_feature(handle_t *handle, 2672 struct super_block *sb, __u32 incompat); 2673 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2674 struct ext4_group_desc *bg); 2675 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2676 struct ext4_group_desc *bg); 2677 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2678 struct ext4_group_desc *bg); 2679 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2680 struct ext4_group_desc *bg); 2681 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2682 struct ext4_group_desc *bg); 2683 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2684 struct ext4_group_desc *bg); 2685 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2686 struct ext4_group_desc *bg); 2687 extern void ext4_block_bitmap_set(struct super_block *sb, 2688 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2689 extern void ext4_inode_bitmap_set(struct super_block *sb, 2690 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2691 extern void ext4_inode_table_set(struct super_block *sb, 2692 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2693 extern void ext4_free_group_clusters_set(struct super_block *sb, 2694 struct ext4_group_desc *bg, 2695 __u32 count); 2696 extern void ext4_free_inodes_set(struct super_block *sb, 2697 struct ext4_group_desc *bg, __u32 count); 2698 extern void ext4_used_dirs_set(struct super_block *sb, 2699 struct ext4_group_desc *bg, __u32 count); 2700 extern void ext4_itable_unused_set(struct super_block *sb, 2701 struct ext4_group_desc *bg, __u32 count); 2702 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2703 struct ext4_group_desc *gdp); 2704 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2705 struct ext4_group_desc *gdp); 2706 extern int ext4_register_li_request(struct super_block *sb, 2707 ext4_group_t first_not_zeroed); 2708 2709 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2710 { 2711 return ext4_has_feature_gdt_csum(sb) || 2712 EXT4_SB(sb)->s_chksum_driver != NULL; 2713 } 2714 2715 static inline int ext4_has_metadata_csum(struct super_block *sb) 2716 { 2717 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 2718 !EXT4_SB(sb)->s_chksum_driver); 2719 2720 return (EXT4_SB(sb)->s_chksum_driver != NULL); 2721 } 2722 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2723 { 2724 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2725 le32_to_cpu(es->s_blocks_count_lo); 2726 } 2727 2728 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2729 { 2730 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2731 le32_to_cpu(es->s_r_blocks_count_lo); 2732 } 2733 2734 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2735 { 2736 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2737 le32_to_cpu(es->s_free_blocks_count_lo); 2738 } 2739 2740 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2741 ext4_fsblk_t blk) 2742 { 2743 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2744 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2745 } 2746 2747 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2748 ext4_fsblk_t blk) 2749 { 2750 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2751 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2752 } 2753 2754 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2755 ext4_fsblk_t blk) 2756 { 2757 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2758 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2759 } 2760 2761 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 2762 { 2763 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2764 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2765 le32_to_cpu(raw_inode->i_size_lo); 2766 else 2767 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2768 } 2769 2770 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2771 { 2772 raw_inode->i_size_lo = cpu_to_le32(i_size); 2773 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2774 } 2775 2776 static inline 2777 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2778 ext4_group_t group) 2779 { 2780 struct ext4_group_info ***grp_info; 2781 long indexv, indexh; 2782 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 2783 grp_info = EXT4_SB(sb)->s_group_info; 2784 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2785 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2786 return grp_info[indexv][indexh]; 2787 } 2788 2789 /* 2790 * Reading s_groups_count requires using smp_rmb() afterwards. See 2791 * the locking protocol documented in the comments of ext4_group_add() 2792 * in resize.c 2793 */ 2794 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2795 { 2796 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2797 2798 smp_rmb(); 2799 return ngroups; 2800 } 2801 2802 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2803 ext4_group_t block_group) 2804 { 2805 return block_group >> sbi->s_log_groups_per_flex; 2806 } 2807 2808 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2809 { 2810 return 1 << sbi->s_log_groups_per_flex; 2811 } 2812 2813 #define ext4_std_error(sb, errno) \ 2814 do { \ 2815 if ((errno)) \ 2816 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2817 } while (0) 2818 2819 #ifdef CONFIG_SMP 2820 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2821 * counters. So we need to make sure we have free clusters more 2822 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2823 */ 2824 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2825 #else 2826 #define EXT4_FREECLUSTERS_WATERMARK 0 2827 #endif 2828 2829 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 2830 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2831 { 2832 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 2833 !inode_is_locked(inode)); 2834 down_write(&EXT4_I(inode)->i_data_sem); 2835 if (newsize > EXT4_I(inode)->i_disksize) 2836 EXT4_I(inode)->i_disksize = newsize; 2837 up_write(&EXT4_I(inode)->i_data_sem); 2838 } 2839 2840 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 2841 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 2842 { 2843 int changed = 0; 2844 2845 if (newsize > inode->i_size) { 2846 i_size_write(inode, newsize); 2847 changed = 1; 2848 } 2849 if (newsize > EXT4_I(inode)->i_disksize) { 2850 ext4_update_i_disksize(inode, newsize); 2851 changed |= 2; 2852 } 2853 return changed; 2854 } 2855 2856 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 2857 loff_t len); 2858 2859 struct ext4_group_info { 2860 unsigned long bb_state; 2861 struct rb_root bb_free_root; 2862 ext4_grpblk_t bb_first_free; /* first free block */ 2863 ext4_grpblk_t bb_free; /* total free blocks */ 2864 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 2865 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 2866 struct list_head bb_prealloc_list; 2867 #ifdef DOUBLE_CHECK 2868 void *bb_bitmap; 2869 #endif 2870 struct rw_semaphore alloc_sem; 2871 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2872 * regions, index is order. 2873 * bb_counters[3] = 5 means 2874 * 5 free 8-block regions. */ 2875 }; 2876 2877 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 2878 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 2879 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 2880 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 2881 2882 #define EXT4_MB_GRP_NEED_INIT(grp) \ 2883 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 2884 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 2885 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2886 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 2887 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2888 2889 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 2890 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2891 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 2892 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2893 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 2894 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2895 2896 #define EXT4_MAX_CONTENTION 8 2897 #define EXT4_CONTENTION_THRESHOLD 2 2898 2899 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2900 ext4_group_t group) 2901 { 2902 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2903 } 2904 2905 /* 2906 * Returns true if the filesystem is busy enough that attempts to 2907 * access the block group locks has run into contention. 2908 */ 2909 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 2910 { 2911 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 2912 } 2913 2914 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 2915 { 2916 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 2917 if (spin_trylock(lock)) 2918 /* 2919 * We're able to grab the lock right away, so drop the 2920 * lock contention counter. 2921 */ 2922 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 2923 else { 2924 /* 2925 * The lock is busy, so bump the contention counter, 2926 * and then wait on the spin lock. 2927 */ 2928 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 2929 EXT4_MAX_CONTENTION); 2930 spin_lock(lock); 2931 } 2932 } 2933 2934 static inline void ext4_unlock_group(struct super_block *sb, 2935 ext4_group_t group) 2936 { 2937 spin_unlock(ext4_group_lock_ptr(sb, group)); 2938 } 2939 2940 /* 2941 * Block validity checking 2942 */ 2943 #define ext4_check_indirect_blockref(inode, bh) \ 2944 ext4_check_blockref(__func__, __LINE__, inode, \ 2945 (__le32 *)(bh)->b_data, \ 2946 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 2947 2948 #define ext4_ind_check_inode(inode) \ 2949 ext4_check_blockref(__func__, __LINE__, inode, \ 2950 EXT4_I(inode)->i_data, \ 2951 EXT4_NDIR_BLOCKS) 2952 2953 /* 2954 * Inodes and files operations 2955 */ 2956 2957 /* dir.c */ 2958 extern const struct file_operations ext4_dir_operations; 2959 2960 /* file.c */ 2961 extern const struct inode_operations ext4_file_inode_operations; 2962 extern const struct file_operations ext4_file_operations; 2963 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 2964 2965 /* inline.c */ 2966 extern int ext4_get_max_inline_size(struct inode *inode); 2967 extern int ext4_find_inline_data_nolock(struct inode *inode); 2968 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 2969 unsigned int len); 2970 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 2971 2972 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 2973 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 2974 struct inode *inode, 2975 loff_t pos, unsigned len, 2976 unsigned flags, 2977 struct page **pagep); 2978 extern int ext4_write_inline_data_end(struct inode *inode, 2979 loff_t pos, unsigned len, 2980 unsigned copied, 2981 struct page *page); 2982 extern struct buffer_head * 2983 ext4_journalled_write_inline_data(struct inode *inode, 2984 unsigned len, 2985 struct page *page); 2986 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 2987 struct inode *inode, 2988 loff_t pos, unsigned len, 2989 unsigned flags, 2990 struct page **pagep, 2991 void **fsdata); 2992 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 2993 unsigned len, unsigned copied, 2994 struct page *page); 2995 extern int ext4_try_add_inline_entry(handle_t *handle, 2996 struct ext4_filename *fname, 2997 struct inode *dir, struct inode *inode); 2998 extern int ext4_try_create_inline_dir(handle_t *handle, 2999 struct inode *parent, 3000 struct inode *inode); 3001 extern int ext4_read_inline_dir(struct file *filp, 3002 struct dir_context *ctx, 3003 int *has_inline_data); 3004 extern int htree_inlinedir_to_tree(struct file *dir_file, 3005 struct inode *dir, ext4_lblk_t block, 3006 struct dx_hash_info *hinfo, 3007 __u32 start_hash, __u32 start_minor_hash, 3008 int *has_inline_data); 3009 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3010 struct ext4_filename *fname, 3011 const struct qstr *d_name, 3012 struct ext4_dir_entry_2 **res_dir, 3013 int *has_inline_data); 3014 extern int ext4_delete_inline_entry(handle_t *handle, 3015 struct inode *dir, 3016 struct ext4_dir_entry_2 *de_del, 3017 struct buffer_head *bh, 3018 int *has_inline_data); 3019 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); 3020 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3021 struct ext4_dir_entry_2 **parent_de, 3022 int *retval); 3023 extern int ext4_inline_data_fiemap(struct inode *inode, 3024 struct fiemap_extent_info *fieinfo, 3025 int *has_inline, __u64 start, __u64 len); 3026 extern int ext4_try_to_evict_inline_data(handle_t *handle, 3027 struct inode *inode, 3028 int needed); 3029 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3030 3031 extern int ext4_convert_inline_data(struct inode *inode); 3032 3033 static inline int ext4_has_inline_data(struct inode *inode) 3034 { 3035 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3036 EXT4_I(inode)->i_inline_off; 3037 } 3038 3039 /* namei.c */ 3040 extern const struct inode_operations ext4_dir_inode_operations; 3041 extern const struct inode_operations ext4_special_inode_operations; 3042 extern struct dentry *ext4_get_parent(struct dentry *child); 3043 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3044 struct ext4_dir_entry_2 *de, 3045 int blocksize, int csum_size, 3046 unsigned int parent_ino, int dotdot_real_len); 3047 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t, 3048 unsigned int blocksize); 3049 extern int ext4_handle_dirty_dirent_node(handle_t *handle, 3050 struct inode *inode, 3051 struct buffer_head *bh); 3052 #define S_SHIFT 12 3053 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = { 3054 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3055 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3056 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3057 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3058 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3059 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3060 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3061 }; 3062 3063 static inline void ext4_set_de_type(struct super_block *sb, 3064 struct ext4_dir_entry_2 *de, 3065 umode_t mode) { 3066 if (ext4_has_feature_filetype(sb)) 3067 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3068 } 3069 3070 /* readpages.c */ 3071 extern int ext4_mpage_readpages(struct address_space *mapping, 3072 struct list_head *pages, struct page *page, 3073 unsigned nr_pages); 3074 3075 /* symlink.c */ 3076 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3077 extern const struct inode_operations ext4_symlink_inode_operations; 3078 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3079 3080 /* sysfs.c */ 3081 extern int ext4_register_sysfs(struct super_block *sb); 3082 extern void ext4_unregister_sysfs(struct super_block *sb); 3083 extern int __init ext4_init_sysfs(void); 3084 extern void ext4_exit_sysfs(void); 3085 3086 /* block_validity */ 3087 extern void ext4_release_system_zone(struct super_block *sb); 3088 extern int ext4_setup_system_zone(struct super_block *sb); 3089 extern int __init ext4_init_system_zone(void); 3090 extern void ext4_exit_system_zone(void); 3091 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 3092 ext4_fsblk_t start_blk, 3093 unsigned int count); 3094 extern int ext4_check_blockref(const char *, unsigned int, 3095 struct inode *, __le32 *, unsigned int); 3096 3097 /* extents.c */ 3098 struct ext4_ext_path; 3099 struct ext4_extent; 3100 3101 /* 3102 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3103 * __le32. 3104 */ 3105 #define EXT_MAX_BLOCKS 0xffffffff 3106 3107 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 3108 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 3109 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3110 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3111 struct ext4_map_blocks *map, int flags); 3112 extern int ext4_ext_truncate(handle_t *, struct inode *); 3113 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3114 ext4_lblk_t end); 3115 extern void ext4_ext_init(struct super_block *); 3116 extern void ext4_ext_release(struct super_block *); 3117 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3118 loff_t len); 3119 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3120 loff_t offset, ssize_t len); 3121 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3122 struct ext4_map_blocks *map, int flags); 3123 extern int ext4_ext_calc_metadata_amount(struct inode *inode, 3124 ext4_lblk_t lblocks); 3125 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3126 int num, 3127 struct ext4_ext_path *path); 3128 extern int ext4_can_extents_be_merged(struct inode *inode, 3129 struct ext4_extent *ex1, 3130 struct ext4_extent *ex2); 3131 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3132 struct ext4_ext_path **, 3133 struct ext4_extent *, int); 3134 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3135 struct ext4_ext_path **, 3136 int flags); 3137 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 3138 extern int ext4_ext_check_inode(struct inode *inode); 3139 extern int ext4_find_delalloc_range(struct inode *inode, 3140 ext4_lblk_t lblk_start, 3141 ext4_lblk_t lblk_end); 3142 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk); 3143 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3144 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3145 __u64 start, __u64 len); 3146 extern int ext4_ext_precache(struct inode *inode); 3147 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len); 3148 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len); 3149 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3150 struct inode *inode2, ext4_lblk_t lblk1, 3151 ext4_lblk_t lblk2, ext4_lblk_t count, 3152 int mark_unwritten,int *err); 3153 3154 /* move_extent.c */ 3155 extern void ext4_double_down_write_data_sem(struct inode *first, 3156 struct inode *second); 3157 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3158 struct inode *donor_inode); 3159 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3160 __u64 start_orig, __u64 start_donor, 3161 __u64 len, __u64 *moved_len); 3162 3163 /* page-io.c */ 3164 extern int __init ext4_init_pageio(void); 3165 extern void ext4_exit_pageio(void); 3166 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3167 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3168 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3169 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3170 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3171 struct writeback_control *wbc); 3172 extern void ext4_end_io_rsv_work(struct work_struct *work); 3173 extern void ext4_io_submit(struct ext4_io_submit *io); 3174 extern int ext4_bio_write_page(struct ext4_io_submit *io, 3175 struct page *page, 3176 int len, 3177 struct writeback_control *wbc, 3178 bool keep_towrite); 3179 3180 /* mmp.c */ 3181 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3182 3183 /* 3184 * Add new method to test whether block and inode bitmaps are properly 3185 * initialized. With uninit_bg reading the block from disk is not enough 3186 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3187 */ 3188 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3189 3190 static inline int bitmap_uptodate(struct buffer_head *bh) 3191 { 3192 return (buffer_uptodate(bh) && 3193 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3194 } 3195 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3196 { 3197 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3198 } 3199 3200 /* 3201 * Disable DIO read nolock optimization, so new dioreaders will be forced 3202 * to grab i_mutex 3203 */ 3204 static inline void ext4_inode_block_unlocked_dio(struct inode *inode) 3205 { 3206 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 3207 smp_mb(); 3208 } 3209 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode) 3210 { 3211 smp_mb(); 3212 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 3213 } 3214 3215 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3216 3217 /* For ioend & aio unwritten conversion wait queues */ 3218 #define EXT4_WQ_HASH_SZ 37 3219 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3220 EXT4_WQ_HASH_SZ]) 3221 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3222 3223 extern int ext4_resize_begin(struct super_block *sb); 3224 extern void ext4_resize_end(struct super_block *sb); 3225 3226 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 3227 struct ext4_io_end *io_end) 3228 { 3229 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 3230 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3231 atomic_inc(&EXT4_I(inode)->i_unwritten); 3232 } 3233 } 3234 3235 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3236 { 3237 struct inode *inode = io_end->inode; 3238 3239 if (io_end->flag & EXT4_IO_END_UNWRITTEN) { 3240 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3241 /* Wake up anyone waiting on unwritten extent conversion */ 3242 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) 3243 wake_up_all(ext4_ioend_wq(inode)); 3244 } 3245 } 3246 3247 extern const struct iomap_ops ext4_iomap_ops; 3248 3249 #endif /* __KERNEL__ */ 3250 3251 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3252 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3253 3254 #endif /* _EXT4_H */ 3255