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/wait.h> 30 #include <linux/blockgroup_lock.h> 31 #include <linux/percpu_counter.h> 32 #include <linux/ratelimit.h> 33 #include <crypto/hash.h> 34 #include <linux/falloc.h> 35 #ifdef __KERNEL__ 36 #include <linux/compat.h> 37 #endif 38 39 /* 40 * The fourth extended filesystem constants/structures 41 */ 42 43 /* 44 * Define EXT4FS_DEBUG to produce debug messages 45 */ 46 #undef EXT4FS_DEBUG 47 48 /* 49 * Debug code 50 */ 51 #ifdef EXT4FS_DEBUG 52 #define ext4_debug(f, a...) \ 53 do { \ 54 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 55 __FILE__, __LINE__, __func__); \ 56 printk(KERN_DEBUG f, ## a); \ 57 } while (0) 58 #else 59 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 60 #endif 61 62 /* 63 * Turn on EXT_DEBUG to get lots of info about extents operations. 64 */ 65 #define EXT_DEBUG__ 66 #ifdef EXT_DEBUG 67 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__) 68 #else 69 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 70 #endif 71 72 /* data type for block offset of block group */ 73 typedef int ext4_grpblk_t; 74 75 /* data type for filesystem-wide blocks number */ 76 typedef unsigned long long ext4_fsblk_t; 77 78 /* data type for file logical block number */ 79 typedef __u32 ext4_lblk_t; 80 81 /* data type for block group number */ 82 typedef unsigned int ext4_group_t; 83 84 enum SHIFT_DIRECTION { 85 SHIFT_LEFT = 0, 86 SHIFT_RIGHT, 87 }; 88 89 /* 90 * Flags used in mballoc's allocation_context flags field. 91 * 92 * Also used to show what's going on for debugging purposes when the 93 * flag field is exported via the traceport interface 94 */ 95 96 /* prefer goal again. length */ 97 #define EXT4_MB_HINT_MERGE 0x0001 98 /* blocks already reserved */ 99 #define EXT4_MB_HINT_RESERVED 0x0002 100 /* metadata is being allocated */ 101 #define EXT4_MB_HINT_METADATA 0x0004 102 /* first blocks in the file */ 103 #define EXT4_MB_HINT_FIRST 0x0008 104 /* search for the best chunk */ 105 #define EXT4_MB_HINT_BEST 0x0010 106 /* data is being allocated */ 107 #define EXT4_MB_HINT_DATA 0x0020 108 /* don't preallocate (for tails) */ 109 #define EXT4_MB_HINT_NOPREALLOC 0x0040 110 /* allocate for locality group */ 111 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 112 /* allocate goal blocks or none */ 113 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 114 /* goal is meaningful */ 115 #define EXT4_MB_HINT_TRY_GOAL 0x0200 116 /* blocks already pre-reserved by delayed allocation */ 117 #define EXT4_MB_DELALLOC_RESERVED 0x0400 118 /* We are doing stream allocation */ 119 #define EXT4_MB_STREAM_ALLOC 0x0800 120 /* Use reserved root blocks if needed */ 121 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 122 /* Use blocks from reserved pool */ 123 #define EXT4_MB_USE_RESERVED 0x2000 124 125 struct ext4_allocation_request { 126 /* target inode for block we're allocating */ 127 struct inode *inode; 128 /* how many blocks we want to allocate */ 129 unsigned int len; 130 /* logical block in target inode */ 131 ext4_lblk_t logical; 132 /* the closest logical allocated block to the left */ 133 ext4_lblk_t lleft; 134 /* the closest logical allocated block to the right */ 135 ext4_lblk_t lright; 136 /* phys. target (a hint) */ 137 ext4_fsblk_t goal; 138 /* phys. block for the closest logical allocated block to the left */ 139 ext4_fsblk_t pleft; 140 /* phys. block for the closest logical allocated block to the right */ 141 ext4_fsblk_t pright; 142 /* flags. see above EXT4_MB_HINT_* */ 143 unsigned int flags; 144 }; 145 146 /* 147 * Logical to physical block mapping, used by ext4_map_blocks() 148 * 149 * This structure is used to pass requests into ext4_map_blocks() as 150 * well as to store the information returned by ext4_map_blocks(). It 151 * takes less room on the stack than a struct buffer_head. 152 */ 153 #define EXT4_MAP_NEW (1 << BH_New) 154 #define EXT4_MAP_MAPPED (1 << BH_Mapped) 155 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 156 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 157 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 158 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 159 160 struct ext4_map_blocks { 161 ext4_fsblk_t m_pblk; 162 ext4_lblk_t m_lblk; 163 unsigned int m_len; 164 unsigned int m_flags; 165 }; 166 167 /* 168 * Flags for ext4_io_end->flags 169 */ 170 #define EXT4_IO_END_UNWRITTEN 0x0001 171 172 /* 173 * For converting unwritten extents on a work queue. 'handle' is used for 174 * buffered writeback. 175 */ 176 typedef struct ext4_io_end { 177 struct list_head list; /* per-file finished IO list */ 178 handle_t *handle; /* handle reserved for extent 179 * conversion */ 180 struct inode *inode; /* file being written to */ 181 struct bio *bio; /* Linked list of completed 182 * bios covering the extent */ 183 unsigned int flag; /* unwritten or not */ 184 loff_t offset; /* offset in the file */ 185 ssize_t size; /* size of the extent */ 186 atomic_t count; /* reference counter */ 187 } ext4_io_end_t; 188 189 struct ext4_io_submit { 190 struct writeback_control *io_wbc; 191 struct bio *io_bio; 192 ext4_io_end_t *io_end; 193 sector_t io_next_block; 194 }; 195 196 /* 197 * Special inodes numbers 198 */ 199 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 200 #define EXT4_ROOT_INO 2 /* Root inode */ 201 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 202 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 203 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 204 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 205 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 206 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 207 208 /* First non-reserved inode for old ext4 filesystems */ 209 #define EXT4_GOOD_OLD_FIRST_INO 11 210 211 /* 212 * Maximal count of links to a file 213 */ 214 #define EXT4_LINK_MAX 65000 215 216 /* 217 * Macro-instructions used to manage several block sizes 218 */ 219 #define EXT4_MIN_BLOCK_SIZE 1024 220 #define EXT4_MAX_BLOCK_SIZE 65536 221 #define EXT4_MIN_BLOCK_LOG_SIZE 10 222 #define EXT4_MAX_BLOCK_LOG_SIZE 16 223 #ifdef __KERNEL__ 224 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 225 #else 226 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 227 #endif 228 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 229 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 230 EXT4_SB(s)->s_cluster_bits) 231 #ifdef __KERNEL__ 232 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 233 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 234 #else 235 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 236 #endif 237 #ifdef __KERNEL__ 238 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 239 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 240 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 241 #else 242 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 243 EXT4_GOOD_OLD_INODE_SIZE : \ 244 (s)->s_inode_size) 245 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 246 EXT4_GOOD_OLD_FIRST_INO : \ 247 (s)->s_first_ino) 248 #endif 249 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 250 251 /* Translate a block number to a cluster number */ 252 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 253 /* Translate a cluster number to a block number */ 254 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 255 /* Translate # of blks to # of clusters */ 256 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 257 (sbi)->s_cluster_bits) 258 /* Mask out the low bits to get the starting block of the cluster */ 259 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 260 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 261 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 262 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 263 /* Get the cluster offset */ 264 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 265 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 266 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 267 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 268 269 /* 270 * Structure of a blocks group descriptor 271 */ 272 struct ext4_group_desc 273 { 274 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 275 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 276 __le32 bg_inode_table_lo; /* Inodes table block */ 277 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 278 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 279 __le16 bg_used_dirs_count_lo; /* Directories count */ 280 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 281 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 282 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 283 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 284 __le16 bg_itable_unused_lo; /* Unused inodes count */ 285 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 286 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 287 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 288 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 289 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 290 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 291 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 292 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 293 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 294 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 295 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 296 __u32 bg_reserved; 297 }; 298 299 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 300 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 301 sizeof(__le16)) 302 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 303 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 304 sizeof(__le16)) 305 306 /* 307 * Structure of a flex block group info 308 */ 309 310 struct flex_groups { 311 atomic64_t free_clusters; 312 atomic_t free_inodes; 313 atomic_t used_dirs; 314 }; 315 316 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 317 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 318 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 319 320 /* 321 * Macro-instructions used to manage group descriptors 322 */ 323 #define EXT4_MIN_DESC_SIZE 32 324 #define EXT4_MIN_DESC_SIZE_64BIT 64 325 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 326 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 327 #ifdef __KERNEL__ 328 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 329 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 330 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 331 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 332 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 333 #else 334 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 335 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 336 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 337 #endif 338 339 /* 340 * Constants relative to the data blocks 341 */ 342 #define EXT4_NDIR_BLOCKS 12 343 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 344 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 345 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 346 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 347 348 /* 349 * Inode flags 350 */ 351 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 352 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 353 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 354 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 355 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 356 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 357 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 358 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 359 /* Reserved for compression usage... */ 360 #define EXT4_DIRTY_FL 0x00000100 361 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 362 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 363 /* nb: was previously EXT2_ECOMPR_FL */ 364 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 365 /* End compression flags --- maybe not all used */ 366 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 367 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 368 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 369 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 370 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 371 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 372 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 373 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 374 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 375 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 376 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 377 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 378 379 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 380 #define EXT4_FL_USER_MODIFIABLE 0x004380FF /* User modifiable flags */ 381 382 /* Flags that should be inherited by new inodes from their parent. */ 383 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 384 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 385 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 386 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 387 388 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 389 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 390 391 /* Flags that are appropriate for non-directories/regular files. */ 392 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 393 394 /* Mask out flags that are inappropriate for the given type of inode. */ 395 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 396 { 397 if (S_ISDIR(mode)) 398 return flags; 399 else if (S_ISREG(mode)) 400 return flags & EXT4_REG_FLMASK; 401 else 402 return flags & EXT4_OTHER_FLMASK; 403 } 404 405 /* 406 * Inode flags used for atomic set/get 407 */ 408 enum { 409 EXT4_INODE_SECRM = 0, /* Secure deletion */ 410 EXT4_INODE_UNRM = 1, /* Undelete */ 411 EXT4_INODE_COMPR = 2, /* Compress file */ 412 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 413 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 414 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 415 EXT4_INODE_NODUMP = 6, /* do not dump file */ 416 EXT4_INODE_NOATIME = 7, /* do not update atime */ 417 /* Reserved for compression usage... */ 418 EXT4_INODE_DIRTY = 8, 419 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 420 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 421 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 422 /* End compression flags --- maybe not all used */ 423 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 424 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 425 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 426 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 427 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 428 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 429 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 430 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 431 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 432 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 433 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 434 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 435 }; 436 437 /* 438 * Since it's pretty easy to mix up bit numbers and hex values, we use a 439 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 440 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 441 * any extra space in the compiled kernel image, otherwise, the build will fail. 442 * It's important that these values are the same, since we are using 443 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 444 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 445 * values found in ext2, ext3 and ext4 filesystems, and of course the values 446 * defined in e2fsprogs. 447 * 448 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 449 */ 450 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 451 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 452 453 static inline void ext4_check_flag_values(void) 454 { 455 CHECK_FLAG_VALUE(SECRM); 456 CHECK_FLAG_VALUE(UNRM); 457 CHECK_FLAG_VALUE(COMPR); 458 CHECK_FLAG_VALUE(SYNC); 459 CHECK_FLAG_VALUE(IMMUTABLE); 460 CHECK_FLAG_VALUE(APPEND); 461 CHECK_FLAG_VALUE(NODUMP); 462 CHECK_FLAG_VALUE(NOATIME); 463 CHECK_FLAG_VALUE(DIRTY); 464 CHECK_FLAG_VALUE(COMPRBLK); 465 CHECK_FLAG_VALUE(NOCOMPR); 466 CHECK_FLAG_VALUE(ENCRYPT); 467 CHECK_FLAG_VALUE(INDEX); 468 CHECK_FLAG_VALUE(IMAGIC); 469 CHECK_FLAG_VALUE(JOURNAL_DATA); 470 CHECK_FLAG_VALUE(NOTAIL); 471 CHECK_FLAG_VALUE(DIRSYNC); 472 CHECK_FLAG_VALUE(TOPDIR); 473 CHECK_FLAG_VALUE(HUGE_FILE); 474 CHECK_FLAG_VALUE(EXTENTS); 475 CHECK_FLAG_VALUE(EA_INODE); 476 CHECK_FLAG_VALUE(EOFBLOCKS); 477 CHECK_FLAG_VALUE(INLINE_DATA); 478 CHECK_FLAG_VALUE(RESERVED); 479 } 480 481 /* Used to pass group descriptor data when online resize is done */ 482 struct ext4_new_group_input { 483 __u32 group; /* Group number for this data */ 484 __u64 block_bitmap; /* Absolute block number of block bitmap */ 485 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 486 __u64 inode_table; /* Absolute block number of inode table start */ 487 __u32 blocks_count; /* Total number of blocks in this group */ 488 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 489 __u16 unused; 490 }; 491 492 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 493 struct compat_ext4_new_group_input { 494 u32 group; 495 compat_u64 block_bitmap; 496 compat_u64 inode_bitmap; 497 compat_u64 inode_table; 498 u32 blocks_count; 499 u16 reserved_blocks; 500 u16 unused; 501 }; 502 #endif 503 504 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 505 struct ext4_new_group_data { 506 __u32 group; 507 __u64 block_bitmap; 508 __u64 inode_bitmap; 509 __u64 inode_table; 510 __u32 blocks_count; 511 __u16 reserved_blocks; 512 __u16 unused; 513 __u32 free_blocks_count; 514 }; 515 516 /* Indexes used to index group tables in ext4_new_group_data */ 517 enum { 518 BLOCK_BITMAP = 0, /* block bitmap */ 519 INODE_BITMAP, /* inode bitmap */ 520 INODE_TABLE, /* inode tables */ 521 GROUP_TABLE_COUNT, 522 }; 523 524 /* 525 * Flags used by ext4_map_blocks() 526 */ 527 /* Allocate any needed blocks and/or convert an unwritten 528 extent to be an initialized ext4 */ 529 #define EXT4_GET_BLOCKS_CREATE 0x0001 530 /* Request the creation of an unwritten extent */ 531 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 532 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 533 EXT4_GET_BLOCKS_CREATE) 534 /* Caller is from the delayed allocation writeout path 535 * finally doing the actual allocation of delayed blocks */ 536 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 537 /* caller is from the direct IO path, request to creation of an 538 unwritten extents if not allocated, split the unwritten 539 extent if blocks has been preallocated already*/ 540 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 541 #define EXT4_GET_BLOCKS_CONVERT 0x0010 542 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 543 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 544 /* Convert extent to initialized after IO complete */ 545 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 546 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 547 /* Eventual metadata allocation (due to growing extent tree) 548 * should not fail, so try to use reserved blocks for that.*/ 549 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 550 /* Don't normalize allocation size (used for fallocate) */ 551 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 552 /* Request will not result in inode size update (user for fallocate) */ 553 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 554 /* Do not take i_data_sem locking in ext4_map_blocks */ 555 #define EXT4_GET_BLOCKS_NO_LOCK 0x0100 556 /* Convert written extents to unwritten */ 557 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0200 558 559 /* 560 * The bit position of these flags must not overlap with any of the 561 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 562 * read_extent_tree_block(), ext4_split_extent_at(), 563 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 564 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 565 * caching the extents when reading from the extent tree while a 566 * truncate or punch hole operation is in progress. 567 */ 568 #define EXT4_EX_NOCACHE 0x40000000 569 #define EXT4_EX_FORCE_CACHE 0x20000000 570 571 /* 572 * Flags used by ext4_free_blocks 573 */ 574 #define EXT4_FREE_BLOCKS_METADATA 0x0001 575 #define EXT4_FREE_BLOCKS_FORGET 0x0002 576 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 577 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 578 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 579 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 580 581 /* Encryption algorithms */ 582 #define EXT4_ENCRYPTION_MODE_INVALID 0 583 #define EXT4_ENCRYPTION_MODE_AES_256_XTS 1 584 #define EXT4_ENCRYPTION_MODE_AES_256_GCM 2 585 #define EXT4_ENCRYPTION_MODE_AES_256_CBC 3 586 #define EXT4_ENCRYPTION_MODE_AES_256_CTS 4 587 588 #include "ext4_crypto.h" 589 590 /* 591 * ioctl commands 592 */ 593 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 594 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 595 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 596 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 597 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 598 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 599 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 600 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 601 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 602 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 603 #define EXT4_IOC_MIGRATE _IO('f', 9) 604 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 605 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 606 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 607 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 608 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 609 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 610 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 611 #define EXT4_IOC_SET_ENCRYPTION_POLICY _IOR('f', 19, struct ext4_encryption_policy) 612 #define EXT4_IOC_GET_ENCRYPTION_PWSALT _IOW('f', 20, __u8[16]) 613 #define EXT4_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct ext4_encryption_policy) 614 615 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 616 /* 617 * ioctl commands in 32 bit emulation 618 */ 619 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 620 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 621 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 622 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 623 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 624 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 625 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 626 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 627 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 628 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 629 #endif 630 631 /* Max physical block we can address w/o extents */ 632 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 633 634 /* 635 * Structure of an inode on the disk 636 */ 637 struct ext4_inode { 638 __le16 i_mode; /* File mode */ 639 __le16 i_uid; /* Low 16 bits of Owner Uid */ 640 __le32 i_size_lo; /* Size in bytes */ 641 __le32 i_atime; /* Access time */ 642 __le32 i_ctime; /* Inode Change time */ 643 __le32 i_mtime; /* Modification time */ 644 __le32 i_dtime; /* Deletion Time */ 645 __le16 i_gid; /* Low 16 bits of Group Id */ 646 __le16 i_links_count; /* Links count */ 647 __le32 i_blocks_lo; /* Blocks count */ 648 __le32 i_flags; /* File flags */ 649 union { 650 struct { 651 __le32 l_i_version; 652 } linux1; 653 struct { 654 __u32 h_i_translator; 655 } hurd1; 656 struct { 657 __u32 m_i_reserved1; 658 } masix1; 659 } osd1; /* OS dependent 1 */ 660 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 661 __le32 i_generation; /* File version (for NFS) */ 662 __le32 i_file_acl_lo; /* File ACL */ 663 __le32 i_size_high; 664 __le32 i_obso_faddr; /* Obsoleted fragment address */ 665 union { 666 struct { 667 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 668 __le16 l_i_file_acl_high; 669 __le16 l_i_uid_high; /* these 2 fields */ 670 __le16 l_i_gid_high; /* were reserved2[0] */ 671 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 672 __le16 l_i_reserved; 673 } linux2; 674 struct { 675 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 676 __u16 h_i_mode_high; 677 __u16 h_i_uid_high; 678 __u16 h_i_gid_high; 679 __u32 h_i_author; 680 } hurd2; 681 struct { 682 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 683 __le16 m_i_file_acl_high; 684 __u32 m_i_reserved2[2]; 685 } masix2; 686 } osd2; /* OS dependent 2 */ 687 __le16 i_extra_isize; 688 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 689 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 690 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 691 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 692 __le32 i_crtime; /* File Creation time */ 693 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 694 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 695 }; 696 697 struct move_extent { 698 __u32 reserved; /* should be zero */ 699 __u32 donor_fd; /* donor file descriptor */ 700 __u64 orig_start; /* logical start offset in block for orig */ 701 __u64 donor_start; /* logical start offset in block for donor */ 702 __u64 len; /* block length to be moved */ 703 __u64 moved_len; /* moved block length */ 704 }; 705 706 #define EXT4_EPOCH_BITS 2 707 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 708 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 709 710 /* 711 * Extended fields will fit into an inode if the filesystem was formatted 712 * with large inodes (-I 256 or larger) and there are not currently any EAs 713 * consuming all of the available space. For new inodes we always reserve 714 * enough space for the kernel's known extended fields, but for inodes 715 * created with an old kernel this might not have been the case. None of 716 * the extended inode fields is critical for correct filesystem operation. 717 * This macro checks if a certain field fits in the inode. Note that 718 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 719 */ 720 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 721 ((offsetof(typeof(*ext4_inode), field) + \ 722 sizeof((ext4_inode)->field)) \ 723 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 724 (einode)->i_extra_isize)) \ 725 726 static inline __le32 ext4_encode_extra_time(struct timespec *time) 727 { 728 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 729 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | 730 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); 731 } 732 733 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 734 { 735 if (sizeof(time->tv_sec) > 4) 736 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 737 << 32; 738 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 739 } 740 741 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 742 do { \ 743 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 744 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 745 (raw_inode)->xtime ## _extra = \ 746 ext4_encode_extra_time(&(inode)->xtime); \ 747 } while (0) 748 749 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 750 do { \ 751 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 752 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 753 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 754 (raw_inode)->xtime ## _extra = \ 755 ext4_encode_extra_time(&(einode)->xtime); \ 756 } while (0) 757 758 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 759 do { \ 760 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 761 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 762 ext4_decode_extra_time(&(inode)->xtime, \ 763 raw_inode->xtime ## _extra); \ 764 else \ 765 (inode)->xtime.tv_nsec = 0; \ 766 } while (0) 767 768 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 769 do { \ 770 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 771 (einode)->xtime.tv_sec = \ 772 (signed)le32_to_cpu((raw_inode)->xtime); \ 773 else \ 774 (einode)->xtime.tv_sec = 0; \ 775 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 776 ext4_decode_extra_time(&(einode)->xtime, \ 777 raw_inode->xtime ## _extra); \ 778 else \ 779 (einode)->xtime.tv_nsec = 0; \ 780 } while (0) 781 782 #define i_disk_version osd1.linux1.l_i_version 783 784 #if defined(__KERNEL__) || defined(__linux__) 785 #define i_reserved1 osd1.linux1.l_i_reserved1 786 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 787 #define i_blocks_high osd2.linux2.l_i_blocks_high 788 #define i_uid_low i_uid 789 #define i_gid_low i_gid 790 #define i_uid_high osd2.linux2.l_i_uid_high 791 #define i_gid_high osd2.linux2.l_i_gid_high 792 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 793 794 #elif defined(__GNU__) 795 796 #define i_translator osd1.hurd1.h_i_translator 797 #define i_uid_high osd2.hurd2.h_i_uid_high 798 #define i_gid_high osd2.hurd2.h_i_gid_high 799 #define i_author osd2.hurd2.h_i_author 800 801 #elif defined(__masix__) 802 803 #define i_reserved1 osd1.masix1.m_i_reserved1 804 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 805 #define i_reserved2 osd2.masix2.m_i_reserved2 806 807 #endif /* defined(__KERNEL__) || defined(__linux__) */ 808 809 #include "extents_status.h" 810 811 /* 812 * fourth extended file system inode data in memory 813 */ 814 struct ext4_inode_info { 815 __le32 i_data[15]; /* unconverted */ 816 __u32 i_dtime; 817 ext4_fsblk_t i_file_acl; 818 819 /* 820 * i_block_group is the number of the block group which contains 821 * this file's inode. Constant across the lifetime of the inode, 822 * it is ued for making block allocation decisions - we try to 823 * place a file's data blocks near its inode block, and new inodes 824 * near to their parent directory's inode. 825 */ 826 ext4_group_t i_block_group; 827 ext4_lblk_t i_dir_start_lookup; 828 #if (BITS_PER_LONG < 64) 829 unsigned long i_state_flags; /* Dynamic state flags */ 830 #endif 831 unsigned long i_flags; 832 833 /* 834 * Extended attributes can be read independently of the main file 835 * data. Taking i_mutex even when reading would cause contention 836 * between readers of EAs and writers of regular file data, so 837 * instead we synchronize on xattr_sem when reading or changing 838 * EAs. 839 */ 840 struct rw_semaphore xattr_sem; 841 842 struct list_head i_orphan; /* unlinked but open inodes */ 843 844 /* 845 * i_disksize keeps track of what the inode size is ON DISK, not 846 * in memory. During truncate, i_size is set to the new size by 847 * the VFS prior to calling ext4_truncate(), but the filesystem won't 848 * set i_disksize to 0 until the truncate is actually under way. 849 * 850 * The intent is that i_disksize always represents the blocks which 851 * are used by this file. This allows recovery to restart truncate 852 * on orphans if we crash during truncate. We actually write i_disksize 853 * into the on-disk inode when writing inodes out, instead of i_size. 854 * 855 * The only time when i_disksize and i_size may be different is when 856 * a truncate is in progress. The only things which change i_disksize 857 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 858 */ 859 loff_t i_disksize; 860 861 /* 862 * i_data_sem is for serialising ext4_truncate() against 863 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 864 * data tree are chopped off during truncate. We can't do that in 865 * ext4 because whenever we perform intermediate commits during 866 * truncate, the inode and all the metadata blocks *must* be in a 867 * consistent state which allows truncation of the orphans to restart 868 * during recovery. Hence we must fix the get_block-vs-truncate race 869 * by other means, so we have i_data_sem. 870 */ 871 struct rw_semaphore i_data_sem; 872 struct inode vfs_inode; 873 struct jbd2_inode *jinode; 874 875 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 876 877 /* 878 * File creation time. Its function is same as that of 879 * struct timespec i_{a,c,m}time in the generic inode. 880 */ 881 struct timespec i_crtime; 882 883 /* mballoc */ 884 struct list_head i_prealloc_list; 885 spinlock_t i_prealloc_lock; 886 887 /* extents status tree */ 888 struct ext4_es_tree i_es_tree; 889 rwlock_t i_es_lock; 890 struct list_head i_es_list; 891 unsigned int i_es_all_nr; /* protected by i_es_lock */ 892 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 893 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 894 extents to shrink. Protected by 895 i_es_lock */ 896 897 /* ialloc */ 898 ext4_group_t i_last_alloc_group; 899 900 /* allocation reservation info for delalloc */ 901 /* In case of bigalloc, these refer to clusters rather than blocks */ 902 unsigned int i_reserved_data_blocks; 903 unsigned int i_reserved_meta_blocks; 904 unsigned int i_allocated_meta_blocks; 905 ext4_lblk_t i_da_metadata_calc_last_lblock; 906 int i_da_metadata_calc_len; 907 908 /* on-disk additional length */ 909 __u16 i_extra_isize; 910 911 /* Indicate the inline data space. */ 912 u16 i_inline_off; 913 u16 i_inline_size; 914 915 #ifdef CONFIG_QUOTA 916 /* quota space reservation, managed internally by quota code */ 917 qsize_t i_reserved_quota; 918 #endif 919 920 /* Lock protecting lists below */ 921 spinlock_t i_completed_io_lock; 922 /* 923 * Completed IOs that need unwritten extents handling and have 924 * transaction reserved 925 */ 926 struct list_head i_rsv_conversion_list; 927 /* 928 * Completed IOs that need unwritten extents handling and don't have 929 * transaction reserved 930 */ 931 atomic_t i_ioend_count; /* Number of outstanding io_end structs */ 932 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 933 struct work_struct i_rsv_conversion_work; 934 935 spinlock_t i_block_reservation_lock; 936 937 /* 938 * Transactions that contain inode's metadata needed to complete 939 * fsync and fdatasync, respectively. 940 */ 941 tid_t i_sync_tid; 942 tid_t i_datasync_tid; 943 944 #ifdef CONFIG_QUOTA 945 struct dquot *i_dquot[MAXQUOTAS]; 946 #endif 947 948 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 949 __u32 i_csum_seed; 950 951 #ifdef CONFIG_EXT4_FS_ENCRYPTION 952 /* Encryption params */ 953 struct ext4_crypt_info *i_crypt_info; 954 #endif 955 }; 956 957 /* 958 * File system states 959 */ 960 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 961 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 962 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 963 964 /* 965 * Misc. filesystem flags 966 */ 967 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 968 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 969 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 970 971 /* 972 * Mount flags set via mount options or defaults 973 */ 974 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 975 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 976 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 977 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 978 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 979 #define EXT4_MOUNT_ERRORS_MASK 0x00070 980 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 981 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 982 #ifdef CONFIG_FS_DAX 983 #define EXT4_MOUNT_DAX 0x00200 /* Direct Access */ 984 #else 985 #define EXT4_MOUNT_DAX 0 986 #endif 987 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 988 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 989 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 990 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 991 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 992 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 993 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 994 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 995 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 996 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 997 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 998 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 999 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 1000 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1001 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1002 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1003 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1004 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1005 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1006 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1007 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1008 1009 /* 1010 * Mount flags set either automatically (could not be set by mount option) 1011 * based on per file system feature or property or in special cases such as 1012 * distinguishing between explicit mount option definition and default. 1013 */ 1014 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1015 specified delalloc */ 1016 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1017 size of blocksize * 8 1018 blocks */ 1019 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1020 file systems */ 1021 1022 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1023 ~EXT4_MOUNT_##opt 1024 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1025 EXT4_MOUNT_##opt 1026 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1027 EXT4_MOUNT_##opt) 1028 1029 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1030 ~EXT4_MOUNT2_##opt 1031 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1032 EXT4_MOUNT2_##opt 1033 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1034 EXT4_MOUNT2_##opt) 1035 1036 #define ext4_test_and_set_bit __test_and_set_bit_le 1037 #define ext4_set_bit __set_bit_le 1038 #define ext4_set_bit_atomic ext2_set_bit_atomic 1039 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1040 #define ext4_clear_bit __clear_bit_le 1041 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1042 #define ext4_test_bit test_bit_le 1043 #define ext4_find_next_zero_bit find_next_zero_bit_le 1044 #define ext4_find_next_bit find_next_bit_le 1045 1046 extern void ext4_set_bits(void *bm, int cur, int len); 1047 1048 /* 1049 * Maximal mount counts between two filesystem checks 1050 */ 1051 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1052 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1053 1054 /* 1055 * Behaviour when detecting errors 1056 */ 1057 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1058 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1059 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1060 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1061 1062 /* Metadata checksum algorithm codes */ 1063 #define EXT4_CRC32C_CHKSUM 1 1064 1065 /* 1066 * Structure of the super block 1067 */ 1068 struct ext4_super_block { 1069 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1070 __le32 s_blocks_count_lo; /* Blocks count */ 1071 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1072 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1073 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1074 __le32 s_first_data_block; /* First Data Block */ 1075 __le32 s_log_block_size; /* Block size */ 1076 __le32 s_log_cluster_size; /* Allocation cluster size */ 1077 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1078 __le32 s_clusters_per_group; /* # Clusters per group */ 1079 __le32 s_inodes_per_group; /* # Inodes per group */ 1080 __le32 s_mtime; /* Mount time */ 1081 /*30*/ __le32 s_wtime; /* Write time */ 1082 __le16 s_mnt_count; /* Mount count */ 1083 __le16 s_max_mnt_count; /* Maximal mount count */ 1084 __le16 s_magic; /* Magic signature */ 1085 __le16 s_state; /* File system state */ 1086 __le16 s_errors; /* Behaviour when detecting errors */ 1087 __le16 s_minor_rev_level; /* minor revision level */ 1088 /*40*/ __le32 s_lastcheck; /* time of last check */ 1089 __le32 s_checkinterval; /* max. time between checks */ 1090 __le32 s_creator_os; /* OS */ 1091 __le32 s_rev_level; /* Revision level */ 1092 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1093 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1094 /* 1095 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1096 * 1097 * Note: the difference between the compatible feature set and 1098 * the incompatible feature set is that if there is a bit set 1099 * in the incompatible feature set that the kernel doesn't 1100 * know about, it should refuse to mount the filesystem. 1101 * 1102 * e2fsck's requirements are more strict; if it doesn't know 1103 * about a feature in either the compatible or incompatible 1104 * feature set, it must abort and not try to meddle with 1105 * things it doesn't understand... 1106 */ 1107 __le32 s_first_ino; /* First non-reserved inode */ 1108 __le16 s_inode_size; /* size of inode structure */ 1109 __le16 s_block_group_nr; /* block group # of this superblock */ 1110 __le32 s_feature_compat; /* compatible feature set */ 1111 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1112 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1113 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1114 /*78*/ char s_volume_name[16]; /* volume name */ 1115 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 1116 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1117 /* 1118 * Performance hints. Directory preallocation should only 1119 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1120 */ 1121 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1122 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1123 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1124 /* 1125 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1126 */ 1127 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1128 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1129 __le32 s_journal_dev; /* device number of journal file */ 1130 __le32 s_last_orphan; /* start of list of inodes to delete */ 1131 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1132 __u8 s_def_hash_version; /* Default hash version to use */ 1133 __u8 s_jnl_backup_type; 1134 __le16 s_desc_size; /* size of group descriptor */ 1135 /*100*/ __le32 s_default_mount_opts; 1136 __le32 s_first_meta_bg; /* First metablock block group */ 1137 __le32 s_mkfs_time; /* When the filesystem was created */ 1138 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1139 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1140 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1141 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1142 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1143 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1144 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1145 __le32 s_flags; /* Miscellaneous flags */ 1146 __le16 s_raid_stride; /* RAID stride */ 1147 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1148 __le64 s_mmp_block; /* Block for multi-mount protection */ 1149 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1150 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1151 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1152 __u8 s_encryption_level; /* versioning level for encryption */ 1153 __u8 s_reserved_pad; /* Padding to next 32bits */ 1154 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1155 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1156 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1157 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1158 snapshot's future use */ 1159 __le32 s_snapshot_list; /* inode number of the head of the 1160 on-disk snapshot list */ 1161 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1162 __le32 s_error_count; /* number of fs errors */ 1163 __le32 s_first_error_time; /* first time an error happened */ 1164 __le32 s_first_error_ino; /* inode involved in first error */ 1165 __le64 s_first_error_block; /* block involved of first error */ 1166 __u8 s_first_error_func[32]; /* function where the error happened */ 1167 __le32 s_first_error_line; /* line number where error happened */ 1168 __le32 s_last_error_time; /* most recent time of an error */ 1169 __le32 s_last_error_ino; /* inode involved in last error */ 1170 __le32 s_last_error_line; /* line number where error happened */ 1171 __le64 s_last_error_block; /* block involved of last error */ 1172 __u8 s_last_error_func[32]; /* function where the error happened */ 1173 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1174 __u8 s_mount_opts[64]; 1175 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1176 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1177 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1178 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1179 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1180 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1181 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1182 __le32 s_reserved[100]; /* Padding to the end of the block */ 1183 __le32 s_checksum; /* crc32c(superblock) */ 1184 }; 1185 1186 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1187 1188 #ifdef __KERNEL__ 1189 1190 /* 1191 * run-time mount flags 1192 */ 1193 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1194 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1195 #define EXT4_MF_TEST_DUMMY_ENCRYPTION 0x0004 1196 1197 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1198 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \ 1199 EXT4_MF_TEST_DUMMY_ENCRYPTION)) 1200 #else 1201 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0) 1202 #endif 1203 1204 /* Number of quota types we support */ 1205 #define EXT4_MAXQUOTAS 2 1206 1207 /* 1208 * fourth extended-fs super-block data in memory 1209 */ 1210 struct ext4_sb_info { 1211 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1212 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1213 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1214 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1215 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1216 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1217 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1218 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1219 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1220 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1221 unsigned long s_overhead; /* # of fs overhead clusters */ 1222 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1223 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1224 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1225 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1226 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1227 struct buffer_head **s_group_desc; 1228 unsigned int s_mount_opt; 1229 unsigned int s_mount_opt2; 1230 unsigned int s_mount_flags; 1231 unsigned int s_def_mount_opt; 1232 ext4_fsblk_t s_sb_block; 1233 atomic64_t s_resv_clusters; 1234 kuid_t s_resuid; 1235 kgid_t s_resgid; 1236 unsigned short s_mount_state; 1237 unsigned short s_pad; 1238 int s_addr_per_block_bits; 1239 int s_desc_per_block_bits; 1240 int s_inode_size; 1241 int s_first_ino; 1242 unsigned int s_inode_readahead_blks; 1243 unsigned int s_inode_goal; 1244 spinlock_t s_next_gen_lock; 1245 u32 s_next_generation; 1246 u32 s_hash_seed[4]; 1247 int s_def_hash_version; 1248 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1249 struct percpu_counter s_freeclusters_counter; 1250 struct percpu_counter s_freeinodes_counter; 1251 struct percpu_counter s_dirs_counter; 1252 struct percpu_counter s_dirtyclusters_counter; 1253 struct blockgroup_lock *s_blockgroup_lock; 1254 struct proc_dir_entry *s_proc; 1255 struct kobject s_kobj; 1256 struct completion s_kobj_unregister; 1257 struct super_block *s_sb; 1258 1259 /* Journaling */ 1260 struct journal_s *s_journal; 1261 struct list_head s_orphan; 1262 struct mutex s_orphan_lock; 1263 unsigned long s_resize_flags; /* Flags indicating if there 1264 is a resizer */ 1265 unsigned long s_commit_interval; 1266 u32 s_max_batch_time; 1267 u32 s_min_batch_time; 1268 struct block_device *journal_bdev; 1269 #ifdef CONFIG_QUOTA 1270 char *s_qf_names[EXT4_MAXQUOTAS]; /* Names of quota files with journalled quota */ 1271 int s_jquota_fmt; /* Format of quota to use */ 1272 #endif 1273 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1274 struct rb_root system_blks; 1275 1276 #ifdef EXTENTS_STATS 1277 /* ext4 extents stats */ 1278 unsigned long s_ext_min; 1279 unsigned long s_ext_max; 1280 unsigned long s_depth_max; 1281 spinlock_t s_ext_stats_lock; 1282 unsigned long s_ext_blocks; 1283 unsigned long s_ext_extents; 1284 #endif 1285 1286 /* for buddy allocator */ 1287 struct ext4_group_info ***s_group_info; 1288 struct inode *s_buddy_cache; 1289 spinlock_t s_md_lock; 1290 unsigned short *s_mb_offsets; 1291 unsigned int *s_mb_maxs; 1292 unsigned int s_group_info_size; 1293 1294 /* tunables */ 1295 unsigned long s_stripe; 1296 unsigned int s_mb_stream_request; 1297 unsigned int s_mb_max_to_scan; 1298 unsigned int s_mb_min_to_scan; 1299 unsigned int s_mb_stats; 1300 unsigned int s_mb_order2_reqs; 1301 unsigned int s_mb_group_prealloc; 1302 unsigned int s_max_dir_size_kb; 1303 /* where last allocation was done - for stream allocation */ 1304 unsigned long s_mb_last_group; 1305 unsigned long s_mb_last_start; 1306 1307 /* stats for buddy allocator */ 1308 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1309 atomic_t s_bal_success; /* we found long enough chunks */ 1310 atomic_t s_bal_allocated; /* in blocks */ 1311 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1312 atomic_t s_bal_goals; /* goal hits */ 1313 atomic_t s_bal_breaks; /* too long searches */ 1314 atomic_t s_bal_2orders; /* 2^order hits */ 1315 spinlock_t s_bal_lock; 1316 unsigned long s_mb_buddies_generated; 1317 unsigned long long s_mb_generation_time; 1318 atomic_t s_mb_lost_chunks; 1319 atomic_t s_mb_preallocated; 1320 atomic_t s_mb_discarded; 1321 atomic_t s_lock_busy; 1322 1323 /* locality groups */ 1324 struct ext4_locality_group __percpu *s_locality_groups; 1325 1326 /* for write statistics */ 1327 unsigned long s_sectors_written_start; 1328 u64 s_kbytes_written; 1329 1330 /* the size of zero-out chunk */ 1331 unsigned int s_extent_max_zeroout_kb; 1332 1333 unsigned int s_log_groups_per_flex; 1334 struct flex_groups *s_flex_groups; 1335 ext4_group_t s_flex_groups_allocated; 1336 1337 /* workqueue for reserved extent conversions (buffered io) */ 1338 struct workqueue_struct *rsv_conversion_wq; 1339 1340 /* timer for periodic error stats printing */ 1341 struct timer_list s_err_report; 1342 1343 /* Lazy inode table initialization info */ 1344 struct ext4_li_request *s_li_request; 1345 /* Wait multiplier for lazy initialization thread */ 1346 unsigned int s_li_wait_mult; 1347 1348 /* Kernel thread for multiple mount protection */ 1349 struct task_struct *s_mmp_tsk; 1350 1351 /* record the last minlen when FITRIM is called. */ 1352 atomic_t s_last_trim_minblks; 1353 1354 /* Reference to checksum algorithm driver via cryptoapi */ 1355 struct crypto_shash *s_chksum_driver; 1356 1357 /* Precomputed FS UUID checksum for seeding other checksums */ 1358 __u32 s_csum_seed; 1359 1360 /* Reclaim extents from extent status tree */ 1361 struct shrinker s_es_shrinker; 1362 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1363 long s_es_nr_inode; 1364 struct ext4_es_stats s_es_stats; 1365 struct mb_cache *s_mb_cache; 1366 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1367 1368 /* Ratelimit ext4 messages. */ 1369 struct ratelimit_state s_err_ratelimit_state; 1370 struct ratelimit_state s_warning_ratelimit_state; 1371 struct ratelimit_state s_msg_ratelimit_state; 1372 }; 1373 1374 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1375 { 1376 return sb->s_fs_info; 1377 } 1378 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1379 { 1380 return container_of(inode, struct ext4_inode_info, vfs_inode); 1381 } 1382 1383 static inline struct timespec ext4_current_time(struct inode *inode) 1384 { 1385 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1386 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1387 } 1388 1389 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1390 { 1391 return ino == EXT4_ROOT_INO || 1392 ino == EXT4_USR_QUOTA_INO || 1393 ino == EXT4_GRP_QUOTA_INO || 1394 ino == EXT4_BOOT_LOADER_INO || 1395 ino == EXT4_JOURNAL_INO || 1396 ino == EXT4_RESIZE_INO || 1397 (ino >= EXT4_FIRST_INO(sb) && 1398 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1399 } 1400 1401 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 1402 struct ext4_io_end *io_end) 1403 { 1404 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 1405 io_end->flag |= EXT4_IO_END_UNWRITTEN; 1406 atomic_inc(&EXT4_I(inode)->i_unwritten); 1407 } 1408 } 1409 1410 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode) 1411 { 1412 return inode->i_private; 1413 } 1414 1415 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io) 1416 { 1417 inode->i_private = io; 1418 } 1419 1420 /* 1421 * Inode dynamic state flags 1422 */ 1423 enum { 1424 EXT4_STATE_JDATA, /* journaled data exists */ 1425 EXT4_STATE_NEW, /* inode is newly created */ 1426 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1427 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1428 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1429 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1430 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1431 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1432 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read 1433 nolocking */ 1434 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1435 EXT4_STATE_ORDERED_MODE, /* data=ordered mode */ 1436 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1437 }; 1438 1439 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1440 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1441 { \ 1442 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1443 } \ 1444 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1445 { \ 1446 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1447 } \ 1448 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1449 { \ 1450 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1451 } 1452 1453 /* Add these declarations here only so that these functions can be 1454 * found by name. Otherwise, they are very hard to locate. */ 1455 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1456 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1457 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1458 EXT4_INODE_BIT_FNS(flag, flags, 0) 1459 1460 /* Add these declarations here only so that these functions can be 1461 * found by name. Otherwise, they are very hard to locate. */ 1462 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1463 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1464 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1465 #if (BITS_PER_LONG < 64) 1466 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1467 1468 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1469 { 1470 (ei)->i_state_flags = 0; 1471 } 1472 #else 1473 EXT4_INODE_BIT_FNS(state, flags, 32) 1474 1475 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1476 { 1477 /* We depend on the fact that callers will set i_flags */ 1478 } 1479 #endif 1480 #else 1481 /* Assume that user mode programs are passing in an ext4fs superblock, not 1482 * a kernel struct super_block. This will allow us to call the feature-test 1483 * macros from user land. */ 1484 #define EXT4_SB(sb) (sb) 1485 #endif 1486 1487 /* 1488 * Returns true if the inode is inode is encrypted 1489 */ 1490 static inline int ext4_encrypted_inode(struct inode *inode) 1491 { 1492 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1493 return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT); 1494 #else 1495 return 0; 1496 #endif 1497 } 1498 1499 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1500 1501 /* 1502 * Codes for operating systems 1503 */ 1504 #define EXT4_OS_LINUX 0 1505 #define EXT4_OS_HURD 1 1506 #define EXT4_OS_MASIX 2 1507 #define EXT4_OS_FREEBSD 3 1508 #define EXT4_OS_LITES 4 1509 1510 /* 1511 * Revision levels 1512 */ 1513 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1514 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1515 1516 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1517 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1518 1519 #define EXT4_GOOD_OLD_INODE_SIZE 128 1520 1521 /* 1522 * Feature set definitions 1523 */ 1524 1525 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1526 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1527 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1528 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1529 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1530 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1531 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1532 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1533 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1534 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1535 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1536 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1537 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1538 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1539 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1540 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1541 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1542 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1543 1544 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1545 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1546 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1547 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1548 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1549 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1550 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1551 1552 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1553 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1554 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1555 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1556 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1557 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1558 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1559 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1560 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1561 /* 1562 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1563 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1564 * all other data structures' checksums. However, the METADATA_CSUM and 1565 * GDT_CSUM bits are mutually exclusive. 1566 */ 1567 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1568 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1569 1570 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1571 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1572 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1573 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1574 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1575 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1576 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1577 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1578 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1579 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1580 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1581 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */ 1582 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1583 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1584 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1585 1586 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1587 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1588 EXT4_FEATURE_INCOMPAT_META_BG) 1589 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1590 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1591 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1592 1593 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1594 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1595 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1596 EXT4_FEATURE_INCOMPAT_META_BG) 1597 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1598 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1599 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1600 1601 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 1602 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1603 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1604 EXT4_FEATURE_INCOMPAT_META_BG| \ 1605 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1606 EXT4_FEATURE_INCOMPAT_64BIT| \ 1607 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1608 EXT4_FEATURE_INCOMPAT_MMP | \ 1609 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 1610 EXT4_FEATURE_INCOMPAT_ENCRYPT) 1611 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1612 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1613 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1614 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1615 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1616 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1617 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1618 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1619 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1620 EXT4_FEATURE_RO_COMPAT_QUOTA) 1621 1622 /* 1623 * Default values for user and/or group using reserved blocks 1624 */ 1625 #define EXT4_DEF_RESUID 0 1626 #define EXT4_DEF_RESGID 0 1627 1628 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1629 1630 /* 1631 * Default mount options 1632 */ 1633 #define EXT4_DEFM_DEBUG 0x0001 1634 #define EXT4_DEFM_BSDGROUPS 0x0002 1635 #define EXT4_DEFM_XATTR_USER 0x0004 1636 #define EXT4_DEFM_ACL 0x0008 1637 #define EXT4_DEFM_UID16 0x0010 1638 #define EXT4_DEFM_JMODE 0x0060 1639 #define EXT4_DEFM_JMODE_DATA 0x0020 1640 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1641 #define EXT4_DEFM_JMODE_WBACK 0x0060 1642 #define EXT4_DEFM_NOBARRIER 0x0100 1643 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1644 #define EXT4_DEFM_DISCARD 0x0400 1645 #define EXT4_DEFM_NODELALLOC 0x0800 1646 1647 /* 1648 * Default journal batch times 1649 */ 1650 #define EXT4_DEF_MIN_BATCH_TIME 0 1651 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1652 1653 /* 1654 * Minimum number of groups in a flexgroup before we separate out 1655 * directories into the first block group of a flexgroup 1656 */ 1657 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1658 1659 /* 1660 * Structure of a directory entry 1661 */ 1662 #define EXT4_NAME_LEN 255 1663 1664 struct ext4_dir_entry { 1665 __le32 inode; /* Inode number */ 1666 __le16 rec_len; /* Directory entry length */ 1667 __le16 name_len; /* Name length */ 1668 char name[EXT4_NAME_LEN]; /* File name */ 1669 }; 1670 1671 /* 1672 * The new version of the directory entry. Since EXT4 structures are 1673 * stored in intel byte order, and the name_len field could never be 1674 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1675 * file_type field. 1676 */ 1677 struct ext4_dir_entry_2 { 1678 __le32 inode; /* Inode number */ 1679 __le16 rec_len; /* Directory entry length */ 1680 __u8 name_len; /* Name length */ 1681 __u8 file_type; 1682 char name[EXT4_NAME_LEN]; /* File name */ 1683 }; 1684 1685 /* 1686 * This is a bogus directory entry at the end of each leaf block that 1687 * records checksums. 1688 */ 1689 struct ext4_dir_entry_tail { 1690 __le32 det_reserved_zero1; /* Pretend to be unused */ 1691 __le16 det_rec_len; /* 12 */ 1692 __u8 det_reserved_zero2; /* Zero name length */ 1693 __u8 det_reserved_ft; /* 0xDE, fake file type */ 1694 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1695 }; 1696 1697 #define EXT4_DIRENT_TAIL(block, blocksize) \ 1698 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 1699 ((blocksize) - \ 1700 sizeof(struct ext4_dir_entry_tail)))) 1701 1702 /* 1703 * Ext4 directory file types. Only the low 3 bits are used. The 1704 * other bits are reserved for now. 1705 */ 1706 #define EXT4_FT_UNKNOWN 0 1707 #define EXT4_FT_REG_FILE 1 1708 #define EXT4_FT_DIR 2 1709 #define EXT4_FT_CHRDEV 3 1710 #define EXT4_FT_BLKDEV 4 1711 #define EXT4_FT_FIFO 5 1712 #define EXT4_FT_SOCK 6 1713 #define EXT4_FT_SYMLINK 7 1714 1715 #define EXT4_FT_MAX 8 1716 1717 #define EXT4_FT_DIR_CSUM 0xDE 1718 1719 /* 1720 * EXT4_DIR_PAD defines the directory entries boundaries 1721 * 1722 * NOTE: It must be a multiple of 4 1723 */ 1724 #define EXT4_DIR_PAD 4 1725 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1726 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1727 ~EXT4_DIR_ROUND) 1728 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1729 1730 /* 1731 * If we ever get support for fs block sizes > page_size, we'll need 1732 * to remove the #if statements in the next two functions... 1733 */ 1734 static inline unsigned int 1735 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1736 { 1737 unsigned len = le16_to_cpu(dlen); 1738 1739 #if (PAGE_CACHE_SIZE >= 65536) 1740 if (len == EXT4_MAX_REC_LEN || len == 0) 1741 return blocksize; 1742 return (len & 65532) | ((len & 3) << 16); 1743 #else 1744 return len; 1745 #endif 1746 } 1747 1748 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1749 { 1750 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1751 BUG(); 1752 #if (PAGE_CACHE_SIZE >= 65536) 1753 if (len < 65536) 1754 return cpu_to_le16(len); 1755 if (len == blocksize) { 1756 if (blocksize == 65536) 1757 return cpu_to_le16(EXT4_MAX_REC_LEN); 1758 else 1759 return cpu_to_le16(0); 1760 } 1761 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 1762 #else 1763 return cpu_to_le16(len); 1764 #endif 1765 } 1766 1767 /* 1768 * Hash Tree Directory indexing 1769 * (c) Daniel Phillips, 2001 1770 */ 1771 1772 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 1773 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 1774 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 1775 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 1776 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 1777 1778 /* Legal values for the dx_root hash_version field: */ 1779 1780 #define DX_HASH_LEGACY 0 1781 #define DX_HASH_HALF_MD4 1 1782 #define DX_HASH_TEA 2 1783 #define DX_HASH_LEGACY_UNSIGNED 3 1784 #define DX_HASH_HALF_MD4_UNSIGNED 4 1785 #define DX_HASH_TEA_UNSIGNED 5 1786 1787 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 1788 const void *address, unsigned int length) 1789 { 1790 struct { 1791 struct shash_desc shash; 1792 char ctx[4]; 1793 } desc; 1794 int err; 1795 1796 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 1797 1798 desc.shash.tfm = sbi->s_chksum_driver; 1799 desc.shash.flags = 0; 1800 *(u32 *)desc.ctx = crc; 1801 1802 err = crypto_shash_update(&desc.shash, address, length); 1803 BUG_ON(err); 1804 1805 return *(u32 *)desc.ctx; 1806 } 1807 1808 #ifdef __KERNEL__ 1809 1810 /* hash info structure used by the directory hash */ 1811 struct dx_hash_info 1812 { 1813 u32 hash; 1814 u32 minor_hash; 1815 int hash_version; 1816 u32 *seed; 1817 }; 1818 1819 1820 /* 32 and 64 bit signed EOF for dx directories */ 1821 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 1822 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 1823 1824 1825 /* 1826 * Control parameters used by ext4_htree_next_block 1827 */ 1828 #define HASH_NB_ALWAYS 1 1829 1830 struct ext4_filename { 1831 const struct qstr *usr_fname; 1832 struct ext4_str disk_name; 1833 struct dx_hash_info hinfo; 1834 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1835 struct ext4_str crypto_buf; 1836 #endif 1837 }; 1838 1839 #define fname_name(p) ((p)->disk_name.name) 1840 #define fname_len(p) ((p)->disk_name.len) 1841 1842 /* 1843 * Describe an inode's exact location on disk and in memory 1844 */ 1845 struct ext4_iloc 1846 { 1847 struct buffer_head *bh; 1848 unsigned long offset; 1849 ext4_group_t block_group; 1850 }; 1851 1852 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 1853 { 1854 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 1855 } 1856 1857 /* 1858 * This structure is stuffed into the struct file's private_data field 1859 * for directories. It is where we put information so that we can do 1860 * readdir operations in hash tree order. 1861 */ 1862 struct dir_private_info { 1863 struct rb_root root; 1864 struct rb_node *curr_node; 1865 struct fname *extra_fname; 1866 loff_t last_pos; 1867 __u32 curr_hash; 1868 __u32 curr_minor_hash; 1869 __u32 next_hash; 1870 }; 1871 1872 /* calculate the first block number of the group */ 1873 static inline ext4_fsblk_t 1874 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 1875 { 1876 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 1877 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 1878 } 1879 1880 /* 1881 * Special error return code only used by dx_probe() and its callers. 1882 */ 1883 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 1884 1885 /* 1886 * Timeout and state flag for lazy initialization inode thread. 1887 */ 1888 #define EXT4_DEF_LI_WAIT_MULT 10 1889 #define EXT4_DEF_LI_MAX_START_DELAY 5 1890 #define EXT4_LAZYINIT_QUIT 0x0001 1891 #define EXT4_LAZYINIT_RUNNING 0x0002 1892 1893 /* 1894 * Lazy inode table initialization info 1895 */ 1896 struct ext4_lazy_init { 1897 unsigned long li_state; 1898 struct list_head li_request_list; 1899 struct mutex li_list_mtx; 1900 }; 1901 1902 struct ext4_li_request { 1903 struct super_block *lr_super; 1904 struct ext4_sb_info *lr_sbi; 1905 ext4_group_t lr_next_group; 1906 struct list_head lr_request; 1907 unsigned long lr_next_sched; 1908 unsigned long lr_timeout; 1909 }; 1910 1911 struct ext4_features { 1912 struct kobject f_kobj; 1913 struct completion f_kobj_unregister; 1914 }; 1915 1916 /* 1917 * This structure will be used for multiple mount protection. It will be 1918 * written into the block number saved in the s_mmp_block field in the 1919 * superblock. Programs that check MMP should assume that if 1920 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 1921 * to use the filesystem, regardless of how old the timestamp is. 1922 */ 1923 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 1924 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 1925 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 1926 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 1927 1928 struct mmp_struct { 1929 __le32 mmp_magic; /* Magic number for MMP */ 1930 __le32 mmp_seq; /* Sequence no. updated periodically */ 1931 1932 /* 1933 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 1934 * purposes and do not affect the correctness of the algorithm 1935 */ 1936 __le64 mmp_time; /* Time last updated */ 1937 char mmp_nodename[64]; /* Node which last updated MMP block */ 1938 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 1939 1940 /* 1941 * mmp_check_interval is used to verify if the MMP block has been 1942 * updated on the block device. The value is updated based on the 1943 * maximum time to write the MMP block during an update cycle. 1944 */ 1945 __le16 mmp_check_interval; 1946 1947 __le16 mmp_pad1; 1948 __le32 mmp_pad2[226]; 1949 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 1950 }; 1951 1952 /* arguments passed to the mmp thread */ 1953 struct mmpd_data { 1954 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 1955 struct super_block *sb; /* super block of the fs */ 1956 }; 1957 1958 /* 1959 * Check interval multiplier 1960 * The MMP block is written every update interval and initially checked every 1961 * update interval x the multiplier (the value is then adapted based on the 1962 * write latency). The reason is that writes can be delayed under load and we 1963 * don't want readers to incorrectly assume that the filesystem is no longer 1964 * in use. 1965 */ 1966 #define EXT4_MMP_CHECK_MULT 2UL 1967 1968 /* 1969 * Minimum interval for MMP checking in seconds. 1970 */ 1971 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 1972 1973 /* 1974 * Maximum interval for MMP checking in seconds. 1975 */ 1976 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 1977 1978 /* 1979 * Function prototypes 1980 */ 1981 1982 /* 1983 * Ok, these declarations are also in <linux/kernel.h> but none of the 1984 * ext4 source programs needs to include it so they are duplicated here. 1985 */ 1986 # define NORET_TYPE /**/ 1987 # define ATTRIB_NORET __attribute__((noreturn)) 1988 # define NORET_AND noreturn, 1989 1990 /* bitmap.c */ 1991 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 1992 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 1993 struct ext4_group_desc *gdp, 1994 struct buffer_head *bh, int sz); 1995 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 1996 struct ext4_group_desc *gdp, 1997 struct buffer_head *bh, int sz); 1998 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 1999 struct ext4_group_desc *gdp, 2000 struct buffer_head *bh); 2001 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2002 struct ext4_group_desc *gdp, 2003 struct buffer_head *bh); 2004 2005 /* balloc.c */ 2006 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2007 ext4_fsblk_t blocknr, 2008 ext4_group_t *blockgrpp, 2009 ext4_grpblk_t *offsetp); 2010 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2011 ext4_fsblk_t block); 2012 2013 extern unsigned int ext4_block_group(struct super_block *sb, 2014 ext4_fsblk_t blocknr); 2015 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2016 ext4_fsblk_t blocknr); 2017 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2018 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2019 ext4_group_t group); 2020 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2021 ext4_fsblk_t goal, 2022 unsigned int flags, 2023 unsigned long *count, 2024 int *errp); 2025 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2026 s64 nclusters, unsigned int flags); 2027 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2028 extern void ext4_check_blocks_bitmap(struct super_block *); 2029 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2030 ext4_group_t block_group, 2031 struct buffer_head ** bh); 2032 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2033 2034 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2035 ext4_group_t block_group); 2036 extern int ext4_wait_block_bitmap(struct super_block *sb, 2037 ext4_group_t block_group, 2038 struct buffer_head *bh); 2039 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2040 ext4_group_t block_group); 2041 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2042 ext4_group_t block_group, 2043 struct ext4_group_desc *gdp); 2044 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2045 2046 /* crypto_policy.c */ 2047 int ext4_is_child_context_consistent_with_parent(struct inode *parent, 2048 struct inode *child); 2049 int ext4_inherit_context(struct inode *parent, struct inode *child); 2050 void ext4_to_hex(char *dst, char *src, size_t src_size); 2051 int ext4_process_policy(const struct ext4_encryption_policy *policy, 2052 struct inode *inode); 2053 int ext4_get_policy(struct inode *inode, 2054 struct ext4_encryption_policy *policy); 2055 2056 /* crypto.c */ 2057 extern struct kmem_cache *ext4_crypt_info_cachep; 2058 bool ext4_valid_contents_enc_mode(uint32_t mode); 2059 uint32_t ext4_validate_encryption_key_size(uint32_t mode, uint32_t size); 2060 extern struct workqueue_struct *ext4_read_workqueue; 2061 struct ext4_crypto_ctx *ext4_get_crypto_ctx(struct inode *inode); 2062 void ext4_release_crypto_ctx(struct ext4_crypto_ctx *ctx); 2063 void ext4_restore_control_page(struct page *data_page); 2064 struct page *ext4_encrypt(struct inode *inode, 2065 struct page *plaintext_page); 2066 int ext4_decrypt(struct ext4_crypto_ctx *ctx, struct page *page); 2067 int ext4_decrypt_one(struct inode *inode, struct page *page); 2068 int ext4_encrypted_zeroout(struct inode *inode, struct ext4_extent *ex); 2069 2070 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2071 int ext4_init_crypto(void); 2072 void ext4_exit_crypto(void); 2073 static inline int ext4_sb_has_crypto(struct super_block *sb) 2074 { 2075 return EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT); 2076 } 2077 #else 2078 static inline int ext4_init_crypto(void) { return 0; } 2079 static inline void ext4_exit_crypto(void) { } 2080 static inline int ext4_sb_has_crypto(struct super_block *sb) 2081 { 2082 return 0; 2083 } 2084 #endif 2085 2086 /* crypto_fname.c */ 2087 bool ext4_valid_filenames_enc_mode(uint32_t mode); 2088 u32 ext4_fname_crypto_round_up(u32 size, u32 blksize); 2089 unsigned ext4_fname_encrypted_size(struct inode *inode, u32 ilen); 2090 int ext4_fname_crypto_alloc_buffer(struct inode *inode, 2091 u32 ilen, struct ext4_str *crypto_str); 2092 int _ext4_fname_disk_to_usr(struct inode *inode, 2093 struct dx_hash_info *hinfo, 2094 const struct ext4_str *iname, 2095 struct ext4_str *oname); 2096 int ext4_fname_disk_to_usr(struct inode *inode, 2097 struct dx_hash_info *hinfo, 2098 const struct ext4_dir_entry_2 *de, 2099 struct ext4_str *oname); 2100 int ext4_fname_usr_to_disk(struct inode *inode, 2101 const struct qstr *iname, 2102 struct ext4_str *oname); 2103 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2104 void ext4_fname_crypto_free_buffer(struct ext4_str *crypto_str); 2105 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname, 2106 int lookup, struct ext4_filename *fname); 2107 void ext4_fname_free_filename(struct ext4_filename *fname); 2108 #else 2109 static inline 2110 int ext4_setup_fname_crypto(struct inode *inode) 2111 { 2112 return 0; 2113 } 2114 static inline void ext4_fname_crypto_free_buffer(struct ext4_str *p) { } 2115 static inline int ext4_fname_setup_filename(struct inode *dir, 2116 const struct qstr *iname, 2117 int lookup, struct ext4_filename *fname) 2118 { 2119 fname->usr_fname = iname; 2120 fname->disk_name.name = (unsigned char *) iname->name; 2121 fname->disk_name.len = iname->len; 2122 return 0; 2123 } 2124 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { } 2125 #endif 2126 2127 2128 /* crypto_key.c */ 2129 void ext4_free_crypt_info(struct ext4_crypt_info *ci); 2130 void ext4_free_encryption_info(struct inode *inode, struct ext4_crypt_info *ci); 2131 int _ext4_get_encryption_info(struct inode *inode); 2132 2133 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2134 int ext4_has_encryption_key(struct inode *inode); 2135 2136 static inline int ext4_get_encryption_info(struct inode *inode) 2137 { 2138 struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info; 2139 2140 if (!ci || 2141 (ci->ci_keyring_key && 2142 (ci->ci_keyring_key->flags & ((1 << KEY_FLAG_INVALIDATED) | 2143 (1 << KEY_FLAG_REVOKED) | 2144 (1 << KEY_FLAG_DEAD))))) 2145 return _ext4_get_encryption_info(inode); 2146 return 0; 2147 } 2148 2149 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode) 2150 { 2151 return EXT4_I(inode)->i_crypt_info; 2152 } 2153 2154 #else 2155 static inline int ext4_has_encryption_key(struct inode *inode) 2156 { 2157 return 0; 2158 } 2159 static inline int ext4_get_encryption_info(struct inode *inode) 2160 { 2161 return 0; 2162 } 2163 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode) 2164 { 2165 return NULL; 2166 } 2167 #endif 2168 2169 2170 /* dir.c */ 2171 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2172 struct file *, 2173 struct ext4_dir_entry_2 *, 2174 struct buffer_head *, char *, int, 2175 unsigned int); 2176 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2177 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2178 (de), (bh), (buf), (size), (offset))) 2179 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2180 __u32 minor_hash, 2181 struct ext4_dir_entry_2 *dirent, 2182 struct ext4_str *ent_name); 2183 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2184 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2185 struct buffer_head *bh, 2186 void *buf, int buf_size, 2187 struct ext4_filename *fname, 2188 struct ext4_dir_entry_2 **dest_de); 2189 int ext4_insert_dentry(struct inode *dir, 2190 struct inode *inode, 2191 struct ext4_dir_entry_2 *de, 2192 int buf_size, 2193 struct ext4_filename *fname); 2194 static inline void ext4_update_dx_flag(struct inode *inode) 2195 { 2196 if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb, 2197 EXT4_FEATURE_COMPAT_DIR_INDEX)) 2198 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2199 } 2200 static unsigned char ext4_filetype_table[] = { 2201 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2202 }; 2203 2204 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2205 { 2206 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE) || 2207 (filetype >= EXT4_FT_MAX)) 2208 return DT_UNKNOWN; 2209 2210 return ext4_filetype_table[filetype]; 2211 } 2212 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2213 void *buf, int buf_size); 2214 2215 /* fsync.c */ 2216 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2217 2218 /* hash.c */ 2219 extern int ext4fs_dirhash(const char *name, int len, struct 2220 dx_hash_info *hinfo); 2221 2222 /* ialloc.c */ 2223 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2224 const struct qstr *qstr, __u32 goal, 2225 uid_t *owner, int handle_type, 2226 unsigned int line_no, int nblocks); 2227 2228 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \ 2229 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2230 0, 0, 0) 2231 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2232 type, nblocks) \ 2233 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2234 (type), __LINE__, (nblocks)) 2235 2236 2237 extern void ext4_free_inode(handle_t *, struct inode *); 2238 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2239 extern unsigned long ext4_count_free_inodes(struct super_block *); 2240 extern unsigned long ext4_count_dirs(struct super_block *); 2241 extern void ext4_check_inodes_bitmap(struct super_block *); 2242 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2243 extern int ext4_init_inode_table(struct super_block *sb, 2244 ext4_group_t group, int barrier); 2245 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2246 2247 /* mballoc.c */ 2248 extern long ext4_mb_stats; 2249 extern long ext4_mb_max_to_scan; 2250 extern int ext4_mb_init(struct super_block *); 2251 extern int ext4_mb_release(struct super_block *); 2252 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2253 struct ext4_allocation_request *, int *); 2254 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2255 extern void ext4_discard_preallocations(struct inode *); 2256 extern int __init ext4_init_mballoc(void); 2257 extern void ext4_exit_mballoc(void); 2258 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2259 struct buffer_head *bh, ext4_fsblk_t block, 2260 unsigned long count, int flags); 2261 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2262 ext4_group_t ngroups); 2263 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2264 ext4_group_t i, struct ext4_group_desc *desc); 2265 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2266 ext4_fsblk_t block, unsigned long count); 2267 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2268 2269 /* inode.c */ 2270 int ext4_inode_is_fast_symlink(struct inode *inode); 2271 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2272 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2273 int ext4_get_block_write(struct inode *inode, sector_t iblock, 2274 struct buffer_head *bh_result, int create); 2275 int ext4_get_block_dax(struct inode *inode, sector_t iblock, 2276 struct buffer_head *bh_result, int create); 2277 int ext4_get_block(struct inode *inode, sector_t iblock, 2278 struct buffer_head *bh_result, int create); 2279 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2280 struct buffer_head *bh, int create); 2281 int ext4_walk_page_buffers(handle_t *handle, 2282 struct buffer_head *head, 2283 unsigned from, 2284 unsigned to, 2285 int *partial, 2286 int (*fn)(handle_t *handle, 2287 struct buffer_head *bh)); 2288 int do_journal_get_write_access(handle_t *handle, 2289 struct buffer_head *bh); 2290 #define FALL_BACK_TO_NONDELALLOC 1 2291 #define CONVERT_INLINE_DATA 2 2292 2293 extern struct inode *ext4_iget(struct super_block *, unsigned long); 2294 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long); 2295 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2296 extern int ext4_setattr(struct dentry *, struct iattr *); 2297 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 2298 struct kstat *stat); 2299 extern void ext4_evict_inode(struct inode *); 2300 extern void ext4_clear_inode(struct inode *); 2301 extern int ext4_sync_inode(handle_t *, struct inode *); 2302 extern void ext4_dirty_inode(struct inode *, int); 2303 extern int ext4_change_inode_journal_flag(struct inode *, int); 2304 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2305 extern int ext4_inode_attach_jinode(struct inode *inode); 2306 extern int ext4_can_truncate(struct inode *inode); 2307 extern void ext4_truncate(struct inode *); 2308 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2309 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 2310 extern void ext4_set_inode_flags(struct inode *); 2311 extern void ext4_get_inode_flags(struct ext4_inode_info *); 2312 extern int ext4_alloc_da_blocks(struct inode *inode); 2313 extern void ext4_set_aops(struct inode *inode); 2314 extern int ext4_writepage_trans_blocks(struct inode *); 2315 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2316 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2317 loff_t lstart, loff_t lend); 2318 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 2319 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2320 extern void ext4_da_update_reserve_space(struct inode *inode, 2321 int used, int quota_claim); 2322 2323 /* indirect.c */ 2324 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2325 struct ext4_map_blocks *map, int flags); 2326 extern ssize_t ext4_ind_direct_IO(struct kiocb *iocb, struct iov_iter *iter, 2327 loff_t offset); 2328 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2329 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2330 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2331 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2332 ext4_lblk_t start, ext4_lblk_t end); 2333 2334 /* ioctl.c */ 2335 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2336 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2337 2338 /* migrate.c */ 2339 extern int ext4_ext_migrate(struct inode *); 2340 extern int ext4_ind_migrate(struct inode *inode); 2341 2342 /* namei.c */ 2343 extern int ext4_dirent_csum_verify(struct inode *inode, 2344 struct ext4_dir_entry *dirent); 2345 extern int ext4_orphan_add(handle_t *, struct inode *); 2346 extern int ext4_orphan_del(handle_t *, struct inode *); 2347 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2348 __u32 start_minor_hash, __u32 *next_hash); 2349 extern int ext4_search_dir(struct buffer_head *bh, 2350 char *search_buf, 2351 int buf_size, 2352 struct inode *dir, 2353 struct ext4_filename *fname, 2354 const struct qstr *d_name, 2355 unsigned int offset, 2356 struct ext4_dir_entry_2 **res_dir); 2357 extern int ext4_generic_delete_entry(handle_t *handle, 2358 struct inode *dir, 2359 struct ext4_dir_entry_2 *de_del, 2360 struct buffer_head *bh, 2361 void *entry_buf, 2362 int buf_size, 2363 int csum_size); 2364 extern int ext4_empty_dir(struct inode *inode); 2365 2366 /* resize.c */ 2367 extern int ext4_group_add(struct super_block *sb, 2368 struct ext4_new_group_data *input); 2369 extern int ext4_group_extend(struct super_block *sb, 2370 struct ext4_super_block *es, 2371 ext4_fsblk_t n_blocks_count); 2372 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2373 2374 /* super.c */ 2375 extern int ext4_calculate_overhead(struct super_block *sb); 2376 extern void ext4_superblock_csum_set(struct super_block *sb); 2377 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 2378 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 2379 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2380 ext4_group_t ngroup); 2381 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2382 char nbuf[16]); 2383 2384 extern __printf(4, 5) 2385 void __ext4_error(struct super_block *, const char *, unsigned int, 2386 const char *, ...); 2387 extern __printf(5, 6) 2388 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2389 const char *, ...); 2390 extern __printf(5, 6) 2391 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2392 const char *, ...); 2393 extern void __ext4_std_error(struct super_block *, const char *, 2394 unsigned int, int); 2395 extern __printf(4, 5) 2396 void __ext4_abort(struct super_block *, const char *, unsigned int, 2397 const char *, ...); 2398 extern __printf(4, 5) 2399 void __ext4_warning(struct super_block *, const char *, unsigned int, 2400 const char *, ...); 2401 extern __printf(4, 5) 2402 void __ext4_warning_inode(const struct inode *inode, const char *function, 2403 unsigned int line, const char *fmt, ...); 2404 extern __printf(3, 4) 2405 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2406 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2407 const char *, unsigned int, const char *); 2408 extern __printf(7, 8) 2409 void __ext4_grp_locked_error(const char *, unsigned int, 2410 struct super_block *, ext4_group_t, 2411 unsigned long, ext4_fsblk_t, 2412 const char *, ...); 2413 2414 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 2415 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 2416 2417 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 2418 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 2419 2420 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 2421 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 2422 2423 #ifdef CONFIG_PRINTK 2424 2425 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2426 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__) 2427 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2428 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2429 #define ext4_error(sb, fmt, ...) \ 2430 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2431 #define ext4_abort(sb, fmt, ...) \ 2432 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2433 #define ext4_warning(sb, fmt, ...) \ 2434 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2435 #define ext4_warning_inode(inode, fmt, ...) \ 2436 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 2437 #define ext4_msg(sb, level, fmt, ...) \ 2438 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 2439 #define dump_mmp_msg(sb, mmp, msg) \ 2440 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 2441 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2442 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 2443 fmt, ##__VA_ARGS__) 2444 2445 #else 2446 2447 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2448 do { \ 2449 no_printk(fmt, ##__VA_ARGS__); \ 2450 __ext4_error_inode(inode, "", 0, block, " "); \ 2451 } while (0) 2452 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2453 do { \ 2454 no_printk(fmt, ##__VA_ARGS__); \ 2455 __ext4_error_file(file, "", 0, block, " "); \ 2456 } while (0) 2457 #define ext4_error(sb, fmt, ...) \ 2458 do { \ 2459 no_printk(fmt, ##__VA_ARGS__); \ 2460 __ext4_error(sb, "", 0, " "); \ 2461 } while (0) 2462 #define ext4_abort(sb, fmt, ...) \ 2463 do { \ 2464 no_printk(fmt, ##__VA_ARGS__); \ 2465 __ext4_abort(sb, "", 0, " "); \ 2466 } while (0) 2467 #define ext4_warning(sb, fmt, ...) \ 2468 do { \ 2469 no_printk(fmt, ##__VA_ARGS__); \ 2470 __ext4_warning(sb, "", 0, " "); \ 2471 } while (0) 2472 #define ext4_warning_inode(inode, fmt, ...) \ 2473 do { \ 2474 no_printk(fmt, ##__VA_ARGS__); \ 2475 __ext4_warning_inode(inode, "", 0, " "); \ 2476 } while (0) 2477 #define ext4_msg(sb, level, fmt, ...) \ 2478 do { \ 2479 no_printk(fmt, ##__VA_ARGS__); \ 2480 __ext4_msg(sb, "", " "); \ 2481 } while (0) 2482 #define dump_mmp_msg(sb, mmp, msg) \ 2483 __dump_mmp_msg(sb, mmp, "", 0, "") 2484 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2485 do { \ 2486 no_printk(fmt, ##__VA_ARGS__); \ 2487 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 2488 } while (0) 2489 2490 #endif 2491 2492 extern void ext4_update_dynamic_rev(struct super_block *sb); 2493 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2494 __u32 compat); 2495 extern int ext4_update_rocompat_feature(handle_t *handle, 2496 struct super_block *sb, __u32 rocompat); 2497 extern int ext4_update_incompat_feature(handle_t *handle, 2498 struct super_block *sb, __u32 incompat); 2499 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2500 struct ext4_group_desc *bg); 2501 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2502 struct ext4_group_desc *bg); 2503 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2504 struct ext4_group_desc *bg); 2505 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2506 struct ext4_group_desc *bg); 2507 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2508 struct ext4_group_desc *bg); 2509 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2510 struct ext4_group_desc *bg); 2511 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2512 struct ext4_group_desc *bg); 2513 extern void ext4_block_bitmap_set(struct super_block *sb, 2514 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2515 extern void ext4_inode_bitmap_set(struct super_block *sb, 2516 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2517 extern void ext4_inode_table_set(struct super_block *sb, 2518 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2519 extern void ext4_free_group_clusters_set(struct super_block *sb, 2520 struct ext4_group_desc *bg, 2521 __u32 count); 2522 extern void ext4_free_inodes_set(struct super_block *sb, 2523 struct ext4_group_desc *bg, __u32 count); 2524 extern void ext4_used_dirs_set(struct super_block *sb, 2525 struct ext4_group_desc *bg, __u32 count); 2526 extern void ext4_itable_unused_set(struct super_block *sb, 2527 struct ext4_group_desc *bg, __u32 count); 2528 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2529 struct ext4_group_desc *gdp); 2530 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2531 struct ext4_group_desc *gdp); 2532 extern int ext4_register_li_request(struct super_block *sb, 2533 ext4_group_t first_not_zeroed); 2534 2535 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2536 { 2537 return EXT4_HAS_RO_COMPAT_FEATURE(sb, 2538 EXT4_FEATURE_RO_COMPAT_GDT_CSUM) || 2539 (EXT4_SB(sb)->s_chksum_driver != NULL); 2540 } 2541 2542 static inline int ext4_has_metadata_csum(struct super_block *sb) 2543 { 2544 WARN_ON_ONCE(EXT4_HAS_RO_COMPAT_FEATURE(sb, 2545 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) && 2546 !EXT4_SB(sb)->s_chksum_driver); 2547 2548 return (EXT4_SB(sb)->s_chksum_driver != NULL); 2549 } 2550 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2551 { 2552 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2553 le32_to_cpu(es->s_blocks_count_lo); 2554 } 2555 2556 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2557 { 2558 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2559 le32_to_cpu(es->s_r_blocks_count_lo); 2560 } 2561 2562 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2563 { 2564 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2565 le32_to_cpu(es->s_free_blocks_count_lo); 2566 } 2567 2568 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2569 ext4_fsblk_t blk) 2570 { 2571 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2572 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2573 } 2574 2575 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2576 ext4_fsblk_t blk) 2577 { 2578 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2579 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2580 } 2581 2582 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2583 ext4_fsblk_t blk) 2584 { 2585 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2586 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2587 } 2588 2589 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 2590 { 2591 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2592 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2593 le32_to_cpu(raw_inode->i_size_lo); 2594 else 2595 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2596 } 2597 2598 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2599 { 2600 raw_inode->i_size_lo = cpu_to_le32(i_size); 2601 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2602 } 2603 2604 static inline 2605 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2606 ext4_group_t group) 2607 { 2608 struct ext4_group_info ***grp_info; 2609 long indexv, indexh; 2610 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 2611 grp_info = EXT4_SB(sb)->s_group_info; 2612 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2613 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2614 return grp_info[indexv][indexh]; 2615 } 2616 2617 /* 2618 * Reading s_groups_count requires using smp_rmb() afterwards. See 2619 * the locking protocol documented in the comments of ext4_group_add() 2620 * in resize.c 2621 */ 2622 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2623 { 2624 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2625 2626 smp_rmb(); 2627 return ngroups; 2628 } 2629 2630 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2631 ext4_group_t block_group) 2632 { 2633 return block_group >> sbi->s_log_groups_per_flex; 2634 } 2635 2636 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2637 { 2638 return 1 << sbi->s_log_groups_per_flex; 2639 } 2640 2641 #define ext4_std_error(sb, errno) \ 2642 do { \ 2643 if ((errno)) \ 2644 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2645 } while (0) 2646 2647 #ifdef CONFIG_SMP 2648 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2649 * counters. So we need to make sure we have free clusters more 2650 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2651 */ 2652 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2653 #else 2654 #define EXT4_FREECLUSTERS_WATERMARK 0 2655 #endif 2656 2657 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 2658 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2659 { 2660 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 2661 !mutex_is_locked(&inode->i_mutex)); 2662 down_write(&EXT4_I(inode)->i_data_sem); 2663 if (newsize > EXT4_I(inode)->i_disksize) 2664 EXT4_I(inode)->i_disksize = newsize; 2665 up_write(&EXT4_I(inode)->i_data_sem); 2666 } 2667 2668 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 2669 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 2670 { 2671 int changed = 0; 2672 2673 if (newsize > inode->i_size) { 2674 i_size_write(inode, newsize); 2675 changed = 1; 2676 } 2677 if (newsize > EXT4_I(inode)->i_disksize) { 2678 ext4_update_i_disksize(inode, newsize); 2679 changed |= 2; 2680 } 2681 return changed; 2682 } 2683 2684 struct ext4_group_info { 2685 unsigned long bb_state; 2686 struct rb_root bb_free_root; 2687 ext4_grpblk_t bb_first_free; /* first free block */ 2688 ext4_grpblk_t bb_free; /* total free blocks */ 2689 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 2690 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 2691 struct list_head bb_prealloc_list; 2692 #ifdef DOUBLE_CHECK 2693 void *bb_bitmap; 2694 #endif 2695 struct rw_semaphore alloc_sem; 2696 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2697 * regions, index is order. 2698 * bb_counters[3] = 5 means 2699 * 5 free 8-block regions. */ 2700 }; 2701 2702 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 2703 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 2704 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 2705 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 2706 2707 #define EXT4_MB_GRP_NEED_INIT(grp) \ 2708 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 2709 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 2710 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2711 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 2712 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2713 2714 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 2715 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2716 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 2717 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2718 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 2719 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2720 2721 #define EXT4_MAX_CONTENTION 8 2722 #define EXT4_CONTENTION_THRESHOLD 2 2723 2724 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2725 ext4_group_t group) 2726 { 2727 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2728 } 2729 2730 /* 2731 * Returns true if the filesystem is busy enough that attempts to 2732 * access the block group locks has run into contention. 2733 */ 2734 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 2735 { 2736 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 2737 } 2738 2739 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 2740 { 2741 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 2742 if (spin_trylock(lock)) 2743 /* 2744 * We're able to grab the lock right away, so drop the 2745 * lock contention counter. 2746 */ 2747 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 2748 else { 2749 /* 2750 * The lock is busy, so bump the contention counter, 2751 * and then wait on the spin lock. 2752 */ 2753 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 2754 EXT4_MAX_CONTENTION); 2755 spin_lock(lock); 2756 } 2757 } 2758 2759 static inline void ext4_unlock_group(struct super_block *sb, 2760 ext4_group_t group) 2761 { 2762 spin_unlock(ext4_group_lock_ptr(sb, group)); 2763 } 2764 2765 /* 2766 * Block validity checking 2767 */ 2768 #define ext4_check_indirect_blockref(inode, bh) \ 2769 ext4_check_blockref(__func__, __LINE__, inode, \ 2770 (__le32 *)(bh)->b_data, \ 2771 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 2772 2773 #define ext4_ind_check_inode(inode) \ 2774 ext4_check_blockref(__func__, __LINE__, inode, \ 2775 EXT4_I(inode)->i_data, \ 2776 EXT4_NDIR_BLOCKS) 2777 2778 /* 2779 * Inodes and files operations 2780 */ 2781 2782 /* dir.c */ 2783 extern const struct file_operations ext4_dir_operations; 2784 2785 /* file.c */ 2786 extern const struct inode_operations ext4_file_inode_operations; 2787 extern const struct file_operations ext4_file_operations; 2788 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 2789 2790 /* inline.c */ 2791 extern int ext4_get_max_inline_size(struct inode *inode); 2792 extern int ext4_find_inline_data_nolock(struct inode *inode); 2793 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 2794 unsigned int len); 2795 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 2796 2797 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 2798 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 2799 struct inode *inode, 2800 loff_t pos, unsigned len, 2801 unsigned flags, 2802 struct page **pagep); 2803 extern int ext4_write_inline_data_end(struct inode *inode, 2804 loff_t pos, unsigned len, 2805 unsigned copied, 2806 struct page *page); 2807 extern struct buffer_head * 2808 ext4_journalled_write_inline_data(struct inode *inode, 2809 unsigned len, 2810 struct page *page); 2811 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 2812 struct inode *inode, 2813 loff_t pos, unsigned len, 2814 unsigned flags, 2815 struct page **pagep, 2816 void **fsdata); 2817 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 2818 unsigned len, unsigned copied, 2819 struct page *page); 2820 extern int ext4_try_add_inline_entry(handle_t *handle, 2821 struct ext4_filename *fname, 2822 struct dentry *dentry, 2823 struct inode *inode); 2824 extern int ext4_try_create_inline_dir(handle_t *handle, 2825 struct inode *parent, 2826 struct inode *inode); 2827 extern int ext4_read_inline_dir(struct file *filp, 2828 struct dir_context *ctx, 2829 int *has_inline_data); 2830 extern int htree_inlinedir_to_tree(struct file *dir_file, 2831 struct inode *dir, ext4_lblk_t block, 2832 struct dx_hash_info *hinfo, 2833 __u32 start_hash, __u32 start_minor_hash, 2834 int *has_inline_data); 2835 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 2836 struct ext4_filename *fname, 2837 const struct qstr *d_name, 2838 struct ext4_dir_entry_2 **res_dir, 2839 int *has_inline_data); 2840 extern int ext4_delete_inline_entry(handle_t *handle, 2841 struct inode *dir, 2842 struct ext4_dir_entry_2 *de_del, 2843 struct buffer_head *bh, 2844 int *has_inline_data); 2845 extern int empty_inline_dir(struct inode *dir, int *has_inline_data); 2846 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 2847 struct ext4_dir_entry_2 **parent_de, 2848 int *retval); 2849 extern int ext4_inline_data_fiemap(struct inode *inode, 2850 struct fiemap_extent_info *fieinfo, 2851 int *has_inline, __u64 start, __u64 len); 2852 extern int ext4_try_to_evict_inline_data(handle_t *handle, 2853 struct inode *inode, 2854 int needed); 2855 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline); 2856 2857 extern int ext4_convert_inline_data(struct inode *inode); 2858 2859 static inline int ext4_has_inline_data(struct inode *inode) 2860 { 2861 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 2862 EXT4_I(inode)->i_inline_off; 2863 } 2864 2865 /* namei.c */ 2866 extern const struct inode_operations ext4_dir_inode_operations; 2867 extern const struct inode_operations ext4_special_inode_operations; 2868 extern struct dentry *ext4_get_parent(struct dentry *child); 2869 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 2870 struct ext4_dir_entry_2 *de, 2871 int blocksize, int csum_size, 2872 unsigned int parent_ino, int dotdot_real_len); 2873 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t, 2874 unsigned int blocksize); 2875 extern int ext4_handle_dirty_dirent_node(handle_t *handle, 2876 struct inode *inode, 2877 struct buffer_head *bh); 2878 #define S_SHIFT 12 2879 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = { 2880 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 2881 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 2882 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 2883 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 2884 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 2885 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 2886 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 2887 }; 2888 2889 static inline void ext4_set_de_type(struct super_block *sb, 2890 struct ext4_dir_entry_2 *de, 2891 umode_t mode) { 2892 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE)) 2893 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 2894 } 2895 2896 /* readpages.c */ 2897 extern int ext4_mpage_readpages(struct address_space *mapping, 2898 struct list_head *pages, struct page *page, 2899 unsigned nr_pages); 2900 2901 /* symlink.c */ 2902 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 2903 extern const struct inode_operations ext4_symlink_inode_operations; 2904 extern const struct inode_operations ext4_fast_symlink_inode_operations; 2905 2906 /* block_validity */ 2907 extern void ext4_release_system_zone(struct super_block *sb); 2908 extern int ext4_setup_system_zone(struct super_block *sb); 2909 extern int __init ext4_init_system_zone(void); 2910 extern void ext4_exit_system_zone(void); 2911 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 2912 ext4_fsblk_t start_blk, 2913 unsigned int count); 2914 extern int ext4_check_blockref(const char *, unsigned int, 2915 struct inode *, __le32 *, unsigned int); 2916 2917 /* extents.c */ 2918 struct ext4_ext_path; 2919 struct ext4_extent; 2920 2921 /* 2922 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 2923 * __le32. 2924 */ 2925 #define EXT_MAX_BLOCKS 0xffffffff 2926 2927 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 2928 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 2929 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 2930 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 2931 struct ext4_map_blocks *map, int flags); 2932 extern void ext4_ext_truncate(handle_t *, struct inode *); 2933 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 2934 ext4_lblk_t end); 2935 extern void ext4_ext_init(struct super_block *); 2936 extern void ext4_ext_release(struct super_block *); 2937 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 2938 loff_t len); 2939 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 2940 loff_t offset, ssize_t len); 2941 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 2942 struct ext4_map_blocks *map, int flags); 2943 extern int ext4_ext_calc_metadata_amount(struct inode *inode, 2944 ext4_lblk_t lblocks); 2945 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 2946 int num, 2947 struct ext4_ext_path *path); 2948 extern int ext4_can_extents_be_merged(struct inode *inode, 2949 struct ext4_extent *ex1, 2950 struct ext4_extent *ex2); 2951 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 2952 struct ext4_ext_path **, 2953 struct ext4_extent *, int); 2954 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 2955 struct ext4_ext_path **, 2956 int flags); 2957 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 2958 extern int ext4_ext_check_inode(struct inode *inode); 2959 extern int ext4_find_delalloc_range(struct inode *inode, 2960 ext4_lblk_t lblk_start, 2961 ext4_lblk_t lblk_end); 2962 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk); 2963 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 2964 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2965 __u64 start, __u64 len); 2966 extern int ext4_ext_precache(struct inode *inode); 2967 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len); 2968 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len); 2969 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 2970 struct inode *inode2, ext4_lblk_t lblk1, 2971 ext4_lblk_t lblk2, ext4_lblk_t count, 2972 int mark_unwritten,int *err); 2973 2974 /* move_extent.c */ 2975 extern void ext4_double_down_write_data_sem(struct inode *first, 2976 struct inode *second); 2977 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 2978 struct inode *donor_inode); 2979 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 2980 __u64 start_orig, __u64 start_donor, 2981 __u64 len, __u64 *moved_len); 2982 2983 /* page-io.c */ 2984 extern int __init ext4_init_pageio(void); 2985 extern void ext4_exit_pageio(void); 2986 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 2987 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 2988 extern int ext4_put_io_end(ext4_io_end_t *io_end); 2989 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 2990 extern void ext4_io_submit_init(struct ext4_io_submit *io, 2991 struct writeback_control *wbc); 2992 extern void ext4_end_io_rsv_work(struct work_struct *work); 2993 extern void ext4_io_submit(struct ext4_io_submit *io); 2994 extern int ext4_bio_write_page(struct ext4_io_submit *io, 2995 struct page *page, 2996 int len, 2997 struct writeback_control *wbc, 2998 bool keep_towrite); 2999 3000 /* mmp.c */ 3001 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3002 3003 /* 3004 * Add new method to test whether block and inode bitmaps are properly 3005 * initialized. With uninit_bg reading the block from disk is not enough 3006 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3007 */ 3008 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3009 3010 static inline int bitmap_uptodate(struct buffer_head *bh) 3011 { 3012 return (buffer_uptodate(bh) && 3013 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3014 } 3015 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3016 { 3017 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3018 } 3019 3020 /* 3021 * Disable DIO read nolock optimization, so new dioreaders will be forced 3022 * to grab i_mutex 3023 */ 3024 static inline void ext4_inode_block_unlocked_dio(struct inode *inode) 3025 { 3026 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 3027 smp_mb(); 3028 } 3029 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode) 3030 { 3031 smp_mb(); 3032 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 3033 } 3034 3035 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3036 3037 /* For ioend & aio unwritten conversion wait queues */ 3038 #define EXT4_WQ_HASH_SZ 37 3039 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3040 EXT4_WQ_HASH_SZ]) 3041 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\ 3042 EXT4_WQ_HASH_SZ]) 3043 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3044 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; 3045 3046 #define EXT4_RESIZING 0 3047 extern int ext4_resize_begin(struct super_block *sb); 3048 extern void ext4_resize_end(struct super_block *sb); 3049 3050 #endif /* __KERNEL__ */ 3051 3052 #endif /* _EXT4_H */ 3053