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 <crypto/hash.h> 33 #ifdef __KERNEL__ 34 #include <linux/compat.h> 35 #endif 36 37 /* 38 * The fourth extended filesystem constants/structures 39 */ 40 41 /* 42 * Define EXT4FS_DEBUG to produce debug messages 43 */ 44 #undef EXT4FS_DEBUG 45 46 /* 47 * Debug code 48 */ 49 #ifdef EXT4FS_DEBUG 50 #define ext4_debug(f, a...) \ 51 do { \ 52 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 53 __FILE__, __LINE__, __func__); \ 54 printk(KERN_DEBUG f, ## a); \ 55 } while (0) 56 #else 57 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 58 #endif 59 60 /* 61 * Turn on EXT_DEBUG to get lots of info about extents operations. 62 */ 63 #define EXT_DEBUG__ 64 #ifdef EXT_DEBUG 65 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__) 66 #else 67 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 68 #endif 69 70 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 71 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 72 73 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 74 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 75 76 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 77 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 78 79 /* data type for block offset of block group */ 80 typedef int ext4_grpblk_t; 81 82 /* data type for filesystem-wide blocks number */ 83 typedef unsigned long long ext4_fsblk_t; 84 85 /* data type for file logical block number */ 86 typedef __u32 ext4_lblk_t; 87 88 /* data type for block group number */ 89 typedef unsigned int ext4_group_t; 90 91 /* 92 * Flags used in mballoc's allocation_context flags field. 93 * 94 * Also used to show what's going on for debugging purposes when the 95 * flag field is exported via the traceport interface 96 */ 97 98 /* prefer goal again. length */ 99 #define EXT4_MB_HINT_MERGE 0x0001 100 /* blocks already reserved */ 101 #define EXT4_MB_HINT_RESERVED 0x0002 102 /* metadata is being allocated */ 103 #define EXT4_MB_HINT_METADATA 0x0004 104 /* first blocks in the file */ 105 #define EXT4_MB_HINT_FIRST 0x0008 106 /* search for the best chunk */ 107 #define EXT4_MB_HINT_BEST 0x0010 108 /* data is being allocated */ 109 #define EXT4_MB_HINT_DATA 0x0020 110 /* don't preallocate (for tails) */ 111 #define EXT4_MB_HINT_NOPREALLOC 0x0040 112 /* allocate for locality group */ 113 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 114 /* allocate goal blocks or none */ 115 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 116 /* goal is meaningful */ 117 #define EXT4_MB_HINT_TRY_GOAL 0x0200 118 /* blocks already pre-reserved by delayed allocation */ 119 #define EXT4_MB_DELALLOC_RESERVED 0x0400 120 /* We are doing stream allocation */ 121 #define EXT4_MB_STREAM_ALLOC 0x0800 122 /* Use reserved root blocks if needed */ 123 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 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_UNINIT (1 << BH_Uninit) 158 /* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of 159 * ext4_map_blocks wants to know whether or not the underlying cluster has 160 * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that 161 * the requested mapping was from previously mapped (or delayed allocated) 162 * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster 163 * should never appear on buffer_head's state flags. 164 */ 165 #define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster) 166 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 167 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\ 168 EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER) 169 170 struct ext4_map_blocks { 171 ext4_fsblk_t m_pblk; 172 ext4_lblk_t m_lblk; 173 unsigned int m_len; 174 unsigned int m_flags; 175 }; 176 177 /* 178 * For delayed allocation tracking 179 */ 180 struct mpage_da_data { 181 struct inode *inode; 182 sector_t b_blocknr; /* start block number of extent */ 183 size_t b_size; /* size of extent */ 184 unsigned long b_state; /* state of the extent */ 185 unsigned long first_page, next_page; /* extent of pages */ 186 struct writeback_control *wbc; 187 int io_done; 188 int pages_written; 189 int retval; 190 }; 191 192 /* 193 * Flags for ext4_io_end->flags 194 */ 195 #define EXT4_IO_END_UNWRITTEN 0x0001 196 #define EXT4_IO_END_ERROR 0x0002 197 #define EXT4_IO_END_QUEUED 0x0004 198 #define EXT4_IO_END_DIRECT 0x0008 199 200 struct ext4_io_page { 201 struct page *p_page; 202 atomic_t p_count; 203 }; 204 205 #define MAX_IO_PAGES 128 206 207 /* 208 * For converting uninitialized extents on a work queue. 209 * 210 * 'page' is only used from the writepage() path; 'pages' is only used for 211 * buffered writes; they are used to keep page references until conversion 212 * takes place. For AIO/DIO, neither field is filled in. 213 */ 214 typedef struct ext4_io_end { 215 struct list_head list; /* per-file finished IO list */ 216 struct inode *inode; /* file being written to */ 217 unsigned int flag; /* unwritten or not */ 218 struct page *page; /* for writepage() path */ 219 loff_t offset; /* offset in the file */ 220 ssize_t size; /* size of the extent */ 221 struct work_struct work; /* data work queue */ 222 struct kiocb *iocb; /* iocb struct for AIO */ 223 int result; /* error value for AIO */ 224 int num_io_pages; /* for writepages() */ 225 struct ext4_io_page *pages[MAX_IO_PAGES]; /* for writepages() */ 226 } ext4_io_end_t; 227 228 struct ext4_io_submit { 229 int io_op; 230 struct bio *io_bio; 231 ext4_io_end_t *io_end; 232 struct ext4_io_page *io_page; 233 sector_t io_next_block; 234 }; 235 236 /* 237 * Special inodes numbers 238 */ 239 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 240 #define EXT4_ROOT_INO 2 /* Root inode */ 241 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 242 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 243 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 244 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 245 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 246 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 247 248 /* First non-reserved inode for old ext4 filesystems */ 249 #define EXT4_GOOD_OLD_FIRST_INO 11 250 251 /* 252 * Maximal count of links to a file 253 */ 254 #define EXT4_LINK_MAX 65000 255 256 /* 257 * Macro-instructions used to manage several block sizes 258 */ 259 #define EXT4_MIN_BLOCK_SIZE 1024 260 #define EXT4_MAX_BLOCK_SIZE 65536 261 #define EXT4_MIN_BLOCK_LOG_SIZE 10 262 #define EXT4_MAX_BLOCK_LOG_SIZE 16 263 #ifdef __KERNEL__ 264 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 265 #else 266 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 267 #endif 268 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 269 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 270 EXT4_SB(s)->s_cluster_bits) 271 #ifdef __KERNEL__ 272 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 273 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 274 #else 275 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 276 #endif 277 #ifdef __KERNEL__ 278 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 279 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 280 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 281 #else 282 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 283 EXT4_GOOD_OLD_INODE_SIZE : \ 284 (s)->s_inode_size) 285 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 286 EXT4_GOOD_OLD_FIRST_INO : \ 287 (s)->s_first_ino) 288 #endif 289 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 290 291 /* Translate a block number to a cluster number */ 292 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 293 /* Translate a cluster number to a block number */ 294 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 295 /* Translate # of blks to # of clusters */ 296 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 297 (sbi)->s_cluster_bits) 298 299 /* 300 * Structure of a blocks group descriptor 301 */ 302 struct ext4_group_desc 303 { 304 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 305 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 306 __le32 bg_inode_table_lo; /* Inodes table block */ 307 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 308 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 309 __le16 bg_used_dirs_count_lo; /* Directories count */ 310 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 311 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 312 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 313 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 314 __le16 bg_itable_unused_lo; /* Unused inodes count */ 315 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 316 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 317 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 318 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 319 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 320 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 321 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 322 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 323 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 324 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 325 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 326 __u32 bg_reserved; 327 }; 328 329 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 330 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 331 sizeof(__le16)) 332 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 333 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 334 sizeof(__le16)) 335 336 /* 337 * Structure of a flex block group info 338 */ 339 340 struct flex_groups { 341 atomic_t free_inodes; 342 atomic_t free_clusters; 343 atomic_t used_dirs; 344 }; 345 346 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 347 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 348 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 349 350 /* 351 * Macro-instructions used to manage group descriptors 352 */ 353 #define EXT4_MIN_DESC_SIZE 32 354 #define EXT4_MIN_DESC_SIZE_64BIT 64 355 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 356 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 357 #ifdef __KERNEL__ 358 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 359 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 360 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 361 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 362 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 363 #else 364 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 365 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 366 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 367 #endif 368 369 /* 370 * Constants relative to the data blocks 371 */ 372 #define EXT4_NDIR_BLOCKS 12 373 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 374 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 375 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 376 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 377 378 /* 379 * Inode flags 380 */ 381 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 382 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 383 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 384 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 385 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 386 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 387 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 388 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 389 /* Reserved for compression usage... */ 390 #define EXT4_DIRTY_FL 0x00000100 391 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 392 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 393 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 394 /* End compression flags --- maybe not all used */ 395 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 396 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 397 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 398 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 399 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 400 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 401 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 402 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 403 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 404 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 405 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 406 407 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 408 #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ 409 410 /* Flags that should be inherited by new inodes from their parent. */ 411 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 412 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 413 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 414 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 415 416 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 417 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 418 419 /* Flags that are appropriate for non-directories/regular files. */ 420 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 421 422 /* Mask out flags that are inappropriate for the given type of inode. */ 423 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 424 { 425 if (S_ISDIR(mode)) 426 return flags; 427 else if (S_ISREG(mode)) 428 return flags & EXT4_REG_FLMASK; 429 else 430 return flags & EXT4_OTHER_FLMASK; 431 } 432 433 /* 434 * Inode flags used for atomic set/get 435 */ 436 enum { 437 EXT4_INODE_SECRM = 0, /* Secure deletion */ 438 EXT4_INODE_UNRM = 1, /* Undelete */ 439 EXT4_INODE_COMPR = 2, /* Compress file */ 440 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 441 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 442 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 443 EXT4_INODE_NODUMP = 6, /* do not dump file */ 444 EXT4_INODE_NOATIME = 7, /* do not update atime */ 445 /* Reserved for compression usage... */ 446 EXT4_INODE_DIRTY = 8, 447 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 448 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 449 EXT4_INODE_ECOMPR = 11, /* Compression error */ 450 /* End compression flags --- maybe not all used */ 451 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 452 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 453 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 454 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 455 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 456 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 457 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 458 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 459 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 460 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 461 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 462 }; 463 464 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 465 #define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \ 466 printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \ 467 EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); } 468 469 /* 470 * Since it's pretty easy to mix up bit numbers and hex values, and we 471 * can't do a compile-time test for ENUM values, we use a run-time 472 * test to make sure that EXT4_XXX_FL is consistent with respect to 473 * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop 474 * out so it won't cost any extra space in the compiled kernel image. 475 * But it's important that these values are the same, since we are 476 * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL 477 * must be consistent with the values of FS_XXX_FL defined in 478 * include/linux/fs.h and the on-disk values found in ext2, ext3, and 479 * ext4 filesystems, and of course the values defined in e2fsprogs. 480 * 481 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 482 */ 483 static inline void ext4_check_flag_values(void) 484 { 485 CHECK_FLAG_VALUE(SECRM); 486 CHECK_FLAG_VALUE(UNRM); 487 CHECK_FLAG_VALUE(COMPR); 488 CHECK_FLAG_VALUE(SYNC); 489 CHECK_FLAG_VALUE(IMMUTABLE); 490 CHECK_FLAG_VALUE(APPEND); 491 CHECK_FLAG_VALUE(NODUMP); 492 CHECK_FLAG_VALUE(NOATIME); 493 CHECK_FLAG_VALUE(DIRTY); 494 CHECK_FLAG_VALUE(COMPRBLK); 495 CHECK_FLAG_VALUE(NOCOMPR); 496 CHECK_FLAG_VALUE(ECOMPR); 497 CHECK_FLAG_VALUE(INDEX); 498 CHECK_FLAG_VALUE(IMAGIC); 499 CHECK_FLAG_VALUE(JOURNAL_DATA); 500 CHECK_FLAG_VALUE(NOTAIL); 501 CHECK_FLAG_VALUE(DIRSYNC); 502 CHECK_FLAG_VALUE(TOPDIR); 503 CHECK_FLAG_VALUE(HUGE_FILE); 504 CHECK_FLAG_VALUE(EXTENTS); 505 CHECK_FLAG_VALUE(EA_INODE); 506 CHECK_FLAG_VALUE(EOFBLOCKS); 507 CHECK_FLAG_VALUE(RESERVED); 508 } 509 510 /* Used to pass group descriptor data when online resize is done */ 511 struct ext4_new_group_input { 512 __u32 group; /* Group number for this data */ 513 __u64 block_bitmap; /* Absolute block number of block bitmap */ 514 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 515 __u64 inode_table; /* Absolute block number of inode table start */ 516 __u32 blocks_count; /* Total number of blocks in this group */ 517 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 518 __u16 unused; 519 }; 520 521 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 522 struct compat_ext4_new_group_input { 523 u32 group; 524 compat_u64 block_bitmap; 525 compat_u64 inode_bitmap; 526 compat_u64 inode_table; 527 u32 blocks_count; 528 u16 reserved_blocks; 529 u16 unused; 530 }; 531 #endif 532 533 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 534 struct ext4_new_group_data { 535 __u32 group; 536 __u64 block_bitmap; 537 __u64 inode_bitmap; 538 __u64 inode_table; 539 __u32 blocks_count; 540 __u16 reserved_blocks; 541 __u16 unused; 542 __u32 free_blocks_count; 543 }; 544 545 /* Indexes used to index group tables in ext4_new_group_data */ 546 enum { 547 BLOCK_BITMAP = 0, /* block bitmap */ 548 INODE_BITMAP, /* inode bitmap */ 549 INODE_TABLE, /* inode tables */ 550 GROUP_TABLE_COUNT, 551 }; 552 553 /* 554 * Flags used by ext4_map_blocks() 555 */ 556 /* Allocate any needed blocks and/or convert an unitialized 557 extent to be an initialized ext4 */ 558 #define EXT4_GET_BLOCKS_CREATE 0x0001 559 /* Request the creation of an unitialized extent */ 560 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 561 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ 562 EXT4_GET_BLOCKS_CREATE) 563 /* Caller is from the delayed allocation writeout path, 564 so set the magic i_delalloc_reserve_flag after taking the 565 inode allocation semaphore for */ 566 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 567 /* caller is from the direct IO path, request to creation of an 568 unitialized extents if not allocated, split the uninitialized 569 extent if blocks has been preallocated already*/ 570 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 571 #define EXT4_GET_BLOCKS_CONVERT 0x0010 572 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 573 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 574 /* Convert extent to initialized after IO complete */ 575 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 576 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 577 /* Punch out blocks of an extent */ 578 #define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020 579 /* Don't normalize allocation size (used for fallocate) */ 580 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 581 /* Request will not result in inode size update (user for fallocate) */ 582 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 583 /* Do not take i_data_sem locking in ext4_map_blocks */ 584 #define EXT4_GET_BLOCKS_NO_LOCK 0x0100 585 586 /* 587 * Flags used by ext4_free_blocks 588 */ 589 #define EXT4_FREE_BLOCKS_METADATA 0x0001 590 #define EXT4_FREE_BLOCKS_FORGET 0x0002 591 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 592 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 593 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 594 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 595 596 /* 597 * Flags used by ext4_discard_partial_page_buffers 598 */ 599 #define EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED 0x0001 600 601 /* 602 * ioctl commands 603 */ 604 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 605 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 606 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 607 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 608 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 609 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 610 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 611 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 612 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 613 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 614 #define EXT4_IOC_MIGRATE _IO('f', 9) 615 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 616 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 617 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 618 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 619 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 620 621 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 622 /* 623 * ioctl commands in 32 bit emulation 624 */ 625 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 626 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 627 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 628 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 629 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 630 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 631 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 632 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 633 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 634 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 635 #endif 636 637 /* Max physical block we can address w/o extents */ 638 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 639 640 /* 641 * Structure of an inode on the disk 642 */ 643 struct ext4_inode { 644 __le16 i_mode; /* File mode */ 645 __le16 i_uid; /* Low 16 bits of Owner Uid */ 646 __le32 i_size_lo; /* Size in bytes */ 647 __le32 i_atime; /* Access time */ 648 __le32 i_ctime; /* Inode Change time */ 649 __le32 i_mtime; /* Modification time */ 650 __le32 i_dtime; /* Deletion Time */ 651 __le16 i_gid; /* Low 16 bits of Group Id */ 652 __le16 i_links_count; /* Links count */ 653 __le32 i_blocks_lo; /* Blocks count */ 654 __le32 i_flags; /* File flags */ 655 union { 656 struct { 657 __le32 l_i_version; 658 } linux1; 659 struct { 660 __u32 h_i_translator; 661 } hurd1; 662 struct { 663 __u32 m_i_reserved1; 664 } masix1; 665 } osd1; /* OS dependent 1 */ 666 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 667 __le32 i_generation; /* File version (for NFS) */ 668 __le32 i_file_acl_lo; /* File ACL */ 669 __le32 i_size_high; 670 __le32 i_obso_faddr; /* Obsoleted fragment address */ 671 union { 672 struct { 673 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 674 __le16 l_i_file_acl_high; 675 __le16 l_i_uid_high; /* these 2 fields */ 676 __le16 l_i_gid_high; /* were reserved2[0] */ 677 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 678 __le16 l_i_reserved; 679 } linux2; 680 struct { 681 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 682 __u16 h_i_mode_high; 683 __u16 h_i_uid_high; 684 __u16 h_i_gid_high; 685 __u32 h_i_author; 686 } hurd2; 687 struct { 688 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 689 __le16 m_i_file_acl_high; 690 __u32 m_i_reserved2[2]; 691 } masix2; 692 } osd2; /* OS dependent 2 */ 693 __le16 i_extra_isize; 694 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 695 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 696 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 697 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 698 __le32 i_crtime; /* File Creation time */ 699 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 700 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 701 }; 702 703 struct move_extent { 704 __u32 reserved; /* should be zero */ 705 __u32 donor_fd; /* donor file descriptor */ 706 __u64 orig_start; /* logical start offset in block for orig */ 707 __u64 donor_start; /* logical start offset in block for donor */ 708 __u64 len; /* block length to be moved */ 709 __u64 moved_len; /* moved block length */ 710 }; 711 712 #define EXT4_EPOCH_BITS 2 713 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 714 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 715 716 /* 717 * Extended fields will fit into an inode if the filesystem was formatted 718 * with large inodes (-I 256 or larger) and there are not currently any EAs 719 * consuming all of the available space. For new inodes we always reserve 720 * enough space for the kernel's known extended fields, but for inodes 721 * created with an old kernel this might not have been the case. None of 722 * the extended inode fields is critical for correct filesystem operation. 723 * This macro checks if a certain field fits in the inode. Note that 724 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 725 */ 726 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 727 ((offsetof(typeof(*ext4_inode), field) + \ 728 sizeof((ext4_inode)->field)) \ 729 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 730 (einode)->i_extra_isize)) \ 731 732 static inline __le32 ext4_encode_extra_time(struct timespec *time) 733 { 734 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 735 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | 736 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); 737 } 738 739 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 740 { 741 if (sizeof(time->tv_sec) > 4) 742 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 743 << 32; 744 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 745 } 746 747 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 748 do { \ 749 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 750 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 751 (raw_inode)->xtime ## _extra = \ 752 ext4_encode_extra_time(&(inode)->xtime); \ 753 } while (0) 754 755 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 756 do { \ 757 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 758 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 759 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 760 (raw_inode)->xtime ## _extra = \ 761 ext4_encode_extra_time(&(einode)->xtime); \ 762 } while (0) 763 764 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 765 do { \ 766 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 767 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 768 ext4_decode_extra_time(&(inode)->xtime, \ 769 raw_inode->xtime ## _extra); \ 770 else \ 771 (inode)->xtime.tv_nsec = 0; \ 772 } while (0) 773 774 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 775 do { \ 776 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 777 (einode)->xtime.tv_sec = \ 778 (signed)le32_to_cpu((raw_inode)->xtime); \ 779 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 780 ext4_decode_extra_time(&(einode)->xtime, \ 781 raw_inode->xtime ## _extra); \ 782 else \ 783 (einode)->xtime.tv_nsec = 0; \ 784 } while (0) 785 786 #define i_disk_version osd1.linux1.l_i_version 787 788 #if defined(__KERNEL__) || defined(__linux__) 789 #define i_reserved1 osd1.linux1.l_i_reserved1 790 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 791 #define i_blocks_high osd2.linux2.l_i_blocks_high 792 #define i_uid_low i_uid 793 #define i_gid_low i_gid 794 #define i_uid_high osd2.linux2.l_i_uid_high 795 #define i_gid_high osd2.linux2.l_i_gid_high 796 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 797 798 #elif defined(__GNU__) 799 800 #define i_translator osd1.hurd1.h_i_translator 801 #define i_uid_high osd2.hurd2.h_i_uid_high 802 #define i_gid_high osd2.hurd2.h_i_gid_high 803 #define i_author osd2.hurd2.h_i_author 804 805 #elif defined(__masix__) 806 807 #define i_reserved1 osd1.masix1.m_i_reserved1 808 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 809 #define i_reserved2 osd2.masix2.m_i_reserved2 810 811 #endif /* defined(__KERNEL__) || defined(__linux__) */ 812 813 /* 814 * storage for cached extent 815 * If ec_len == 0, then the cache is invalid. 816 * If ec_start == 0, then the cache represents a gap (null mapping) 817 */ 818 struct ext4_ext_cache { 819 ext4_fsblk_t ec_start; 820 ext4_lblk_t ec_block; 821 __u32 ec_len; /* must be 32bit to return holes */ 822 }; 823 824 #include "extents_status.h" 825 826 /* 827 * fourth extended file system inode data in memory 828 */ 829 struct ext4_inode_info { 830 __le32 i_data[15]; /* unconverted */ 831 __u32 i_dtime; 832 ext4_fsblk_t i_file_acl; 833 834 /* 835 * i_block_group is the number of the block group which contains 836 * this file's inode. Constant across the lifetime of the inode, 837 * it is ued for making block allocation decisions - we try to 838 * place a file's data blocks near its inode block, and new inodes 839 * near to their parent directory's inode. 840 */ 841 ext4_group_t i_block_group; 842 ext4_lblk_t i_dir_start_lookup; 843 #if (BITS_PER_LONG < 64) 844 unsigned long i_state_flags; /* Dynamic state flags */ 845 #endif 846 unsigned long i_flags; 847 848 #ifdef CONFIG_EXT4_FS_XATTR 849 /* 850 * Extended attributes can be read independently of the main file 851 * data. Taking i_mutex even when reading would cause contention 852 * between readers of EAs and writers of regular file data, so 853 * instead we synchronize on xattr_sem when reading or changing 854 * EAs. 855 */ 856 struct rw_semaphore xattr_sem; 857 #endif 858 859 struct list_head i_orphan; /* unlinked but open inodes */ 860 861 /* 862 * i_disksize keeps track of what the inode size is ON DISK, not 863 * in memory. During truncate, i_size is set to the new size by 864 * the VFS prior to calling ext4_truncate(), but the filesystem won't 865 * set i_disksize to 0 until the truncate is actually under way. 866 * 867 * The intent is that i_disksize always represents the blocks which 868 * are used by this file. This allows recovery to restart truncate 869 * on orphans if we crash during truncate. We actually write i_disksize 870 * into the on-disk inode when writing inodes out, instead of i_size. 871 * 872 * The only time when i_disksize and i_size may be different is when 873 * a truncate is in progress. The only things which change i_disksize 874 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 875 */ 876 loff_t i_disksize; 877 878 /* 879 * i_data_sem is for serialising ext4_truncate() against 880 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 881 * data tree are chopped off during truncate. We can't do that in 882 * ext4 because whenever we perform intermediate commits during 883 * truncate, the inode and all the metadata blocks *must* be in a 884 * consistent state which allows truncation of the orphans to restart 885 * during recovery. Hence we must fix the get_block-vs-truncate race 886 * by other means, so we have i_data_sem. 887 */ 888 struct rw_semaphore i_data_sem; 889 struct inode vfs_inode; 890 struct jbd2_inode *jinode; 891 892 struct ext4_ext_cache i_cached_extent; 893 /* 894 * File creation time. Its function is same as that of 895 * struct timespec i_{a,c,m}time in the generic inode. 896 */ 897 struct timespec i_crtime; 898 899 /* mballoc */ 900 struct list_head i_prealloc_list; 901 spinlock_t i_prealloc_lock; 902 903 /* extents status tree */ 904 struct ext4_es_tree i_es_tree; 905 rwlock_t i_es_lock; 906 907 /* ialloc */ 908 ext4_group_t i_last_alloc_group; 909 910 /* allocation reservation info for delalloc */ 911 /* In case of bigalloc, these refer to clusters rather than blocks */ 912 unsigned int i_reserved_data_blocks; 913 unsigned int i_reserved_meta_blocks; 914 unsigned int i_allocated_meta_blocks; 915 ext4_lblk_t i_da_metadata_calc_last_lblock; 916 int i_da_metadata_calc_len; 917 918 /* on-disk additional length */ 919 __u16 i_extra_isize; 920 921 #ifdef CONFIG_QUOTA 922 /* quota space reservation, managed internally by quota code */ 923 qsize_t i_reserved_quota; 924 #endif 925 926 /* completed IOs that might need unwritten extents handling */ 927 struct list_head i_completed_io_list; 928 spinlock_t i_completed_io_lock; 929 atomic_t i_ioend_count; /* Number of outstanding io_end structs */ 930 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 931 932 spinlock_t i_block_reservation_lock; 933 934 /* 935 * Transactions that contain inode's metadata needed to complete 936 * fsync and fdatasync, respectively. 937 */ 938 tid_t i_sync_tid; 939 tid_t i_datasync_tid; 940 941 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 942 __u32 i_csum_seed; 943 }; 944 945 /* 946 * File system states 947 */ 948 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 949 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 950 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 951 952 /* 953 * Misc. filesystem flags 954 */ 955 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 956 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 957 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 958 959 /* 960 * Mount flags 961 */ 962 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 963 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 964 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 965 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 966 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 967 #define EXT4_MOUNT_ERRORS_MASK 0x00070 968 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 969 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 970 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 971 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 972 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 973 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 974 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 975 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 976 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 977 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 978 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 979 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 980 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 981 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 982 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 983 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 984 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 985 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 986 #define EXT4_MOUNT_MBLK_IO_SUBMIT 0x4000000 /* multi-block io submits */ 987 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 988 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 989 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 990 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 991 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 992 993 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 994 specified delalloc */ 995 996 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 997 ~EXT4_MOUNT_##opt 998 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 999 EXT4_MOUNT_##opt 1000 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1001 EXT4_MOUNT_##opt) 1002 1003 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1004 ~EXT4_MOUNT2_##opt 1005 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1006 EXT4_MOUNT2_##opt 1007 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1008 EXT4_MOUNT2_##opt) 1009 1010 #define ext4_test_and_set_bit __test_and_set_bit_le 1011 #define ext4_set_bit __set_bit_le 1012 #define ext4_set_bit_atomic ext2_set_bit_atomic 1013 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1014 #define ext4_clear_bit __clear_bit_le 1015 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1016 #define ext4_test_bit test_bit_le 1017 #define ext4_find_next_zero_bit find_next_zero_bit_le 1018 #define ext4_find_next_bit find_next_bit_le 1019 1020 extern void ext4_set_bits(void *bm, int cur, int len); 1021 1022 /* 1023 * Maximal mount counts between two filesystem checks 1024 */ 1025 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1026 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1027 1028 /* 1029 * Behaviour when detecting errors 1030 */ 1031 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1032 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1033 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1034 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1035 1036 /* Metadata checksum algorithm codes */ 1037 #define EXT4_CRC32C_CHKSUM 1 1038 1039 /* 1040 * Structure of the super block 1041 */ 1042 struct ext4_super_block { 1043 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1044 __le32 s_blocks_count_lo; /* Blocks count */ 1045 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1046 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1047 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1048 __le32 s_first_data_block; /* First Data Block */ 1049 __le32 s_log_block_size; /* Block size */ 1050 __le32 s_log_cluster_size; /* Allocation cluster size */ 1051 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1052 __le32 s_clusters_per_group; /* # Clusters per group */ 1053 __le32 s_inodes_per_group; /* # Inodes per group */ 1054 __le32 s_mtime; /* Mount time */ 1055 /*30*/ __le32 s_wtime; /* Write time */ 1056 __le16 s_mnt_count; /* Mount count */ 1057 __le16 s_max_mnt_count; /* Maximal mount count */ 1058 __le16 s_magic; /* Magic signature */ 1059 __le16 s_state; /* File system state */ 1060 __le16 s_errors; /* Behaviour when detecting errors */ 1061 __le16 s_minor_rev_level; /* minor revision level */ 1062 /*40*/ __le32 s_lastcheck; /* time of last check */ 1063 __le32 s_checkinterval; /* max. time between checks */ 1064 __le32 s_creator_os; /* OS */ 1065 __le32 s_rev_level; /* Revision level */ 1066 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1067 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1068 /* 1069 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1070 * 1071 * Note: the difference between the compatible feature set and 1072 * the incompatible feature set is that if there is a bit set 1073 * in the incompatible feature set that the kernel doesn't 1074 * know about, it should refuse to mount the filesystem. 1075 * 1076 * e2fsck's requirements are more strict; if it doesn't know 1077 * about a feature in either the compatible or incompatible 1078 * feature set, it must abort and not try to meddle with 1079 * things it doesn't understand... 1080 */ 1081 __le32 s_first_ino; /* First non-reserved inode */ 1082 __le16 s_inode_size; /* size of inode structure */ 1083 __le16 s_block_group_nr; /* block group # of this superblock */ 1084 __le32 s_feature_compat; /* compatible feature set */ 1085 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1086 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1087 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1088 /*78*/ char s_volume_name[16]; /* volume name */ 1089 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 1090 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1091 /* 1092 * Performance hints. Directory preallocation should only 1093 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1094 */ 1095 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1096 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1097 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1098 /* 1099 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1100 */ 1101 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1102 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1103 __le32 s_journal_dev; /* device number of journal file */ 1104 __le32 s_last_orphan; /* start of list of inodes to delete */ 1105 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1106 __u8 s_def_hash_version; /* Default hash version to use */ 1107 __u8 s_jnl_backup_type; 1108 __le16 s_desc_size; /* size of group descriptor */ 1109 /*100*/ __le32 s_default_mount_opts; 1110 __le32 s_first_meta_bg; /* First metablock block group */ 1111 __le32 s_mkfs_time; /* When the filesystem was created */ 1112 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1113 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1114 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1115 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1116 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1117 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1118 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1119 __le32 s_flags; /* Miscellaneous flags */ 1120 __le16 s_raid_stride; /* RAID stride */ 1121 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1122 __le64 s_mmp_block; /* Block for multi-mount protection */ 1123 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1124 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1125 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1126 __le16 s_reserved_pad; 1127 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1128 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1129 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1130 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1131 snapshot's future use */ 1132 __le32 s_snapshot_list; /* inode number of the head of the 1133 on-disk snapshot list */ 1134 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1135 __le32 s_error_count; /* number of fs errors */ 1136 __le32 s_first_error_time; /* first time an error happened */ 1137 __le32 s_first_error_ino; /* inode involved in first error */ 1138 __le64 s_first_error_block; /* block involved of first error */ 1139 __u8 s_first_error_func[32]; /* function where the error happened */ 1140 __le32 s_first_error_line; /* line number where error happened */ 1141 __le32 s_last_error_time; /* most recent time of an error */ 1142 __le32 s_last_error_ino; /* inode involved in last error */ 1143 __le32 s_last_error_line; /* line number where error happened */ 1144 __le64 s_last_error_block; /* block involved of last error */ 1145 __u8 s_last_error_func[32]; /* function where the error happened */ 1146 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1147 __u8 s_mount_opts[64]; 1148 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1149 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1150 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1151 __le32 s_reserved[108]; /* Padding to the end of the block */ 1152 __le32 s_checksum; /* crc32c(superblock) */ 1153 }; 1154 1155 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1156 1157 #ifdef __KERNEL__ 1158 1159 /* 1160 * run-time mount flags 1161 */ 1162 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1163 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1164 1165 /* 1166 * fourth extended-fs super-block data in memory 1167 */ 1168 struct ext4_sb_info { 1169 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1170 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1171 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1172 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1173 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1174 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1175 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1176 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1177 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1178 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1179 unsigned long s_overhead; /* # of fs overhead clusters */ 1180 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1181 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1182 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1183 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1184 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1185 struct buffer_head **s_group_desc; 1186 unsigned int s_mount_opt; 1187 unsigned int s_mount_opt2; 1188 unsigned int s_mount_flags; 1189 unsigned int s_def_mount_opt; 1190 ext4_fsblk_t s_sb_block; 1191 kuid_t s_resuid; 1192 kgid_t s_resgid; 1193 unsigned short s_mount_state; 1194 unsigned short s_pad; 1195 int s_addr_per_block_bits; 1196 int s_desc_per_block_bits; 1197 int s_inode_size; 1198 int s_first_ino; 1199 unsigned int s_inode_readahead_blks; 1200 unsigned int s_inode_goal; 1201 spinlock_t s_next_gen_lock; 1202 u32 s_next_generation; 1203 u32 s_hash_seed[4]; 1204 int s_def_hash_version; 1205 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1206 struct percpu_counter s_freeclusters_counter; 1207 struct percpu_counter s_freeinodes_counter; 1208 struct percpu_counter s_dirs_counter; 1209 struct percpu_counter s_dirtyclusters_counter; 1210 struct blockgroup_lock *s_blockgroup_lock; 1211 struct proc_dir_entry *s_proc; 1212 struct kobject s_kobj; 1213 struct completion s_kobj_unregister; 1214 struct super_block *s_sb; 1215 1216 /* Journaling */ 1217 struct journal_s *s_journal; 1218 struct list_head s_orphan; 1219 struct mutex s_orphan_lock; 1220 unsigned long s_resize_flags; /* Flags indicating if there 1221 is a resizer */ 1222 unsigned long s_commit_interval; 1223 u32 s_max_batch_time; 1224 u32 s_min_batch_time; 1225 struct block_device *journal_bdev; 1226 #ifdef CONFIG_QUOTA 1227 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ 1228 int s_jquota_fmt; /* Format of quota to use */ 1229 #endif 1230 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1231 struct rb_root system_blks; 1232 1233 #ifdef EXTENTS_STATS 1234 /* ext4 extents stats */ 1235 unsigned long s_ext_min; 1236 unsigned long s_ext_max; 1237 unsigned long s_depth_max; 1238 spinlock_t s_ext_stats_lock; 1239 unsigned long s_ext_blocks; 1240 unsigned long s_ext_extents; 1241 #endif 1242 1243 /* for buddy allocator */ 1244 struct ext4_group_info ***s_group_info; 1245 struct inode *s_buddy_cache; 1246 spinlock_t s_md_lock; 1247 unsigned short *s_mb_offsets; 1248 unsigned int *s_mb_maxs; 1249 unsigned int s_group_info_size; 1250 1251 /* tunables */ 1252 unsigned long s_stripe; 1253 unsigned int s_mb_stream_request; 1254 unsigned int s_mb_max_to_scan; 1255 unsigned int s_mb_min_to_scan; 1256 unsigned int s_mb_stats; 1257 unsigned int s_mb_order2_reqs; 1258 unsigned int s_mb_group_prealloc; 1259 unsigned int s_max_writeback_mb_bump; 1260 unsigned int s_max_dir_size_kb; 1261 /* where last allocation was done - for stream allocation */ 1262 unsigned long s_mb_last_group; 1263 unsigned long s_mb_last_start; 1264 1265 /* stats for buddy allocator */ 1266 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1267 atomic_t s_bal_success; /* we found long enough chunks */ 1268 atomic_t s_bal_allocated; /* in blocks */ 1269 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1270 atomic_t s_bal_goals; /* goal hits */ 1271 atomic_t s_bal_breaks; /* too long searches */ 1272 atomic_t s_bal_2orders; /* 2^order hits */ 1273 spinlock_t s_bal_lock; 1274 unsigned long s_mb_buddies_generated; 1275 unsigned long long s_mb_generation_time; 1276 atomic_t s_mb_lost_chunks; 1277 atomic_t s_mb_preallocated; 1278 atomic_t s_mb_discarded; 1279 atomic_t s_lock_busy; 1280 1281 /* locality groups */ 1282 struct ext4_locality_group __percpu *s_locality_groups; 1283 1284 /* for write statistics */ 1285 unsigned long s_sectors_written_start; 1286 u64 s_kbytes_written; 1287 1288 /* the size of zero-out chunk */ 1289 unsigned int s_extent_max_zeroout_kb; 1290 1291 unsigned int s_log_groups_per_flex; 1292 struct flex_groups *s_flex_groups; 1293 ext4_group_t s_flex_groups_allocated; 1294 1295 /* workqueue for dio unwritten */ 1296 struct workqueue_struct *dio_unwritten_wq; 1297 1298 /* timer for periodic error stats printing */ 1299 struct timer_list s_err_report; 1300 1301 /* Lazy inode table initialization info */ 1302 struct ext4_li_request *s_li_request; 1303 /* Wait multiplier for lazy initialization thread */ 1304 unsigned int s_li_wait_mult; 1305 1306 /* Kernel thread for multiple mount protection */ 1307 struct task_struct *s_mmp_tsk; 1308 1309 /* record the last minlen when FITRIM is called. */ 1310 atomic_t s_last_trim_minblks; 1311 1312 /* Reference to checksum algorithm driver via cryptoapi */ 1313 struct crypto_shash *s_chksum_driver; 1314 1315 /* Precomputed FS UUID checksum for seeding other checksums */ 1316 __u32 s_csum_seed; 1317 }; 1318 1319 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1320 { 1321 return sb->s_fs_info; 1322 } 1323 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1324 { 1325 return container_of(inode, struct ext4_inode_info, vfs_inode); 1326 } 1327 1328 static inline struct timespec ext4_current_time(struct inode *inode) 1329 { 1330 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1331 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1332 } 1333 1334 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1335 { 1336 return ino == EXT4_ROOT_INO || 1337 ino == EXT4_USR_QUOTA_INO || 1338 ino == EXT4_GRP_QUOTA_INO || 1339 ino == EXT4_JOURNAL_INO || 1340 ino == EXT4_RESIZE_INO || 1341 (ino >= EXT4_FIRST_INO(sb) && 1342 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1343 } 1344 1345 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 1346 struct ext4_io_end *io_end) 1347 { 1348 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 1349 io_end->flag |= EXT4_IO_END_UNWRITTEN; 1350 atomic_inc(&EXT4_I(inode)->i_unwritten); 1351 } 1352 } 1353 1354 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode) 1355 { 1356 return inode->i_private; 1357 } 1358 1359 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io) 1360 { 1361 inode->i_private = io; 1362 } 1363 1364 /* 1365 * Inode dynamic state flags 1366 */ 1367 enum { 1368 EXT4_STATE_JDATA, /* journaled data exists */ 1369 EXT4_STATE_NEW, /* inode is newly created */ 1370 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1371 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1372 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1373 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1374 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1375 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1376 EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */ 1377 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read 1378 nolocking */ 1379 }; 1380 1381 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1382 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1383 { \ 1384 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1385 } \ 1386 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1387 { \ 1388 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1389 } \ 1390 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1391 { \ 1392 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1393 } 1394 1395 EXT4_INODE_BIT_FNS(flag, flags, 0) 1396 #if (BITS_PER_LONG < 64) 1397 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1398 1399 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1400 { 1401 (ei)->i_state_flags = 0; 1402 } 1403 #else 1404 EXT4_INODE_BIT_FNS(state, flags, 32) 1405 1406 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1407 { 1408 /* We depend on the fact that callers will set i_flags */ 1409 } 1410 #endif 1411 #else 1412 /* Assume that user mode programs are passing in an ext4fs superblock, not 1413 * a kernel struct super_block. This will allow us to call the feature-test 1414 * macros from user land. */ 1415 #define EXT4_SB(sb) (sb) 1416 #endif 1417 1418 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1419 1420 /* 1421 * Codes for operating systems 1422 */ 1423 #define EXT4_OS_LINUX 0 1424 #define EXT4_OS_HURD 1 1425 #define EXT4_OS_MASIX 2 1426 #define EXT4_OS_FREEBSD 3 1427 #define EXT4_OS_LITES 4 1428 1429 /* 1430 * Revision levels 1431 */ 1432 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1433 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1434 1435 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1436 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1437 1438 #define EXT4_GOOD_OLD_INODE_SIZE 128 1439 1440 /* 1441 * Feature set definitions 1442 */ 1443 1444 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1445 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1446 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1447 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1448 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1449 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1450 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1451 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1452 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1453 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1454 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1455 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1456 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1457 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1458 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1459 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1460 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1461 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1462 1463 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1464 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1465 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1466 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1467 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1468 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1469 1470 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1471 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1472 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1473 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1474 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1475 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1476 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1477 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1478 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1479 /* 1480 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1481 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1482 * all other data structures' checksums. However, the METADATA_CSUM and 1483 * GDT_CSUM bits are mutually exclusive. 1484 */ 1485 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1486 1487 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1488 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1489 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1490 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1491 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1492 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1493 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1494 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1495 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1496 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1497 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1498 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */ 1499 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1500 #define EXT4_FEATURE_INCOMPAT_INLINEDATA 0x8000 /* data in inode */ 1501 1502 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1503 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1504 EXT4_FEATURE_INCOMPAT_META_BG) 1505 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1506 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1507 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1508 1509 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1510 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1511 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1512 EXT4_FEATURE_INCOMPAT_META_BG) 1513 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1514 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1515 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1516 1517 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 1518 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1519 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1520 EXT4_FEATURE_INCOMPAT_META_BG| \ 1521 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1522 EXT4_FEATURE_INCOMPAT_64BIT| \ 1523 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1524 EXT4_FEATURE_INCOMPAT_MMP) 1525 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1526 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1527 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1528 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1529 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1530 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1531 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1532 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1533 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1534 EXT4_FEATURE_RO_COMPAT_QUOTA) 1535 1536 /* 1537 * Default values for user and/or group using reserved blocks 1538 */ 1539 #define EXT4_DEF_RESUID 0 1540 #define EXT4_DEF_RESGID 0 1541 1542 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1543 1544 /* 1545 * Default mount options 1546 */ 1547 #define EXT4_DEFM_DEBUG 0x0001 1548 #define EXT4_DEFM_BSDGROUPS 0x0002 1549 #define EXT4_DEFM_XATTR_USER 0x0004 1550 #define EXT4_DEFM_ACL 0x0008 1551 #define EXT4_DEFM_UID16 0x0010 1552 #define EXT4_DEFM_JMODE 0x0060 1553 #define EXT4_DEFM_JMODE_DATA 0x0020 1554 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1555 #define EXT4_DEFM_JMODE_WBACK 0x0060 1556 #define EXT4_DEFM_NOBARRIER 0x0100 1557 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1558 #define EXT4_DEFM_DISCARD 0x0400 1559 #define EXT4_DEFM_NODELALLOC 0x0800 1560 1561 /* 1562 * Default journal batch times 1563 */ 1564 #define EXT4_DEF_MIN_BATCH_TIME 0 1565 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1566 1567 /* 1568 * Minimum number of groups in a flexgroup before we separate out 1569 * directories into the first block group of a flexgroup 1570 */ 1571 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1572 1573 /* 1574 * Structure of a directory entry 1575 */ 1576 #define EXT4_NAME_LEN 255 1577 1578 struct ext4_dir_entry { 1579 __le32 inode; /* Inode number */ 1580 __le16 rec_len; /* Directory entry length */ 1581 __le16 name_len; /* Name length */ 1582 char name[EXT4_NAME_LEN]; /* File name */ 1583 }; 1584 1585 /* 1586 * The new version of the directory entry. Since EXT4 structures are 1587 * stored in intel byte order, and the name_len field could never be 1588 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1589 * file_type field. 1590 */ 1591 struct ext4_dir_entry_2 { 1592 __le32 inode; /* Inode number */ 1593 __le16 rec_len; /* Directory entry length */ 1594 __u8 name_len; /* Name length */ 1595 __u8 file_type; 1596 char name[EXT4_NAME_LEN]; /* File name */ 1597 }; 1598 1599 /* 1600 * This is a bogus directory entry at the end of each leaf block that 1601 * records checksums. 1602 */ 1603 struct ext4_dir_entry_tail { 1604 __le32 det_reserved_zero1; /* Pretend to be unused */ 1605 __le16 det_rec_len; /* 12 */ 1606 __u8 det_reserved_zero2; /* Zero name length */ 1607 __u8 det_reserved_ft; /* 0xDE, fake file type */ 1608 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1609 }; 1610 1611 /* 1612 * Ext4 directory file types. Only the low 3 bits are used. The 1613 * other bits are reserved for now. 1614 */ 1615 #define EXT4_FT_UNKNOWN 0 1616 #define EXT4_FT_REG_FILE 1 1617 #define EXT4_FT_DIR 2 1618 #define EXT4_FT_CHRDEV 3 1619 #define EXT4_FT_BLKDEV 4 1620 #define EXT4_FT_FIFO 5 1621 #define EXT4_FT_SOCK 6 1622 #define EXT4_FT_SYMLINK 7 1623 1624 #define EXT4_FT_MAX 8 1625 1626 #define EXT4_FT_DIR_CSUM 0xDE 1627 1628 /* 1629 * EXT4_DIR_PAD defines the directory entries boundaries 1630 * 1631 * NOTE: It must be a multiple of 4 1632 */ 1633 #define EXT4_DIR_PAD 4 1634 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1635 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1636 ~EXT4_DIR_ROUND) 1637 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1638 1639 /* 1640 * If we ever get support for fs block sizes > page_size, we'll need 1641 * to remove the #if statements in the next two functions... 1642 */ 1643 static inline unsigned int 1644 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1645 { 1646 unsigned len = le16_to_cpu(dlen); 1647 1648 #if (PAGE_CACHE_SIZE >= 65536) 1649 if (len == EXT4_MAX_REC_LEN || len == 0) 1650 return blocksize; 1651 return (len & 65532) | ((len & 3) << 16); 1652 #else 1653 return len; 1654 #endif 1655 } 1656 1657 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1658 { 1659 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1660 BUG(); 1661 #if (PAGE_CACHE_SIZE >= 65536) 1662 if (len < 65536) 1663 return cpu_to_le16(len); 1664 if (len == blocksize) { 1665 if (blocksize == 65536) 1666 return cpu_to_le16(EXT4_MAX_REC_LEN); 1667 else 1668 return cpu_to_le16(0); 1669 } 1670 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 1671 #else 1672 return cpu_to_le16(len); 1673 #endif 1674 } 1675 1676 /* 1677 * Hash Tree Directory indexing 1678 * (c) Daniel Phillips, 2001 1679 */ 1680 1681 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 1682 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 1683 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 1684 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 1685 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 1686 1687 /* Legal values for the dx_root hash_version field: */ 1688 1689 #define DX_HASH_LEGACY 0 1690 #define DX_HASH_HALF_MD4 1 1691 #define DX_HASH_TEA 2 1692 #define DX_HASH_LEGACY_UNSIGNED 3 1693 #define DX_HASH_HALF_MD4_UNSIGNED 4 1694 #define DX_HASH_TEA_UNSIGNED 5 1695 1696 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 1697 const void *address, unsigned int length) 1698 { 1699 struct { 1700 struct shash_desc shash; 1701 char ctx[4]; 1702 } desc; 1703 int err; 1704 1705 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 1706 1707 desc.shash.tfm = sbi->s_chksum_driver; 1708 desc.shash.flags = 0; 1709 *(u32 *)desc.ctx = crc; 1710 1711 err = crypto_shash_update(&desc.shash, address, length); 1712 BUG_ON(err); 1713 1714 return *(u32 *)desc.ctx; 1715 } 1716 1717 #ifdef __KERNEL__ 1718 1719 /* hash info structure used by the directory hash */ 1720 struct dx_hash_info 1721 { 1722 u32 hash; 1723 u32 minor_hash; 1724 int hash_version; 1725 u32 *seed; 1726 }; 1727 1728 1729 /* 32 and 64 bit signed EOF for dx directories */ 1730 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 1731 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 1732 1733 1734 /* 1735 * Control parameters used by ext4_htree_next_block 1736 */ 1737 #define HASH_NB_ALWAYS 1 1738 1739 1740 /* 1741 * Describe an inode's exact location on disk and in memory 1742 */ 1743 struct ext4_iloc 1744 { 1745 struct buffer_head *bh; 1746 unsigned long offset; 1747 ext4_group_t block_group; 1748 }; 1749 1750 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 1751 { 1752 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 1753 } 1754 1755 /* 1756 * This structure is stuffed into the struct file's private_data field 1757 * for directories. It is where we put information so that we can do 1758 * readdir operations in hash tree order. 1759 */ 1760 struct dir_private_info { 1761 struct rb_root root; 1762 struct rb_node *curr_node; 1763 struct fname *extra_fname; 1764 loff_t last_pos; 1765 __u32 curr_hash; 1766 __u32 curr_minor_hash; 1767 __u32 next_hash; 1768 }; 1769 1770 /* calculate the first block number of the group */ 1771 static inline ext4_fsblk_t 1772 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 1773 { 1774 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 1775 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 1776 } 1777 1778 /* 1779 * Special error return code only used by dx_probe() and its callers. 1780 */ 1781 #define ERR_BAD_DX_DIR -75000 1782 1783 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, 1784 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); 1785 1786 /* 1787 * Timeout and state flag for lazy initialization inode thread. 1788 */ 1789 #define EXT4_DEF_LI_WAIT_MULT 10 1790 #define EXT4_DEF_LI_MAX_START_DELAY 5 1791 #define EXT4_LAZYINIT_QUIT 0x0001 1792 #define EXT4_LAZYINIT_RUNNING 0x0002 1793 1794 /* 1795 * Lazy inode table initialization info 1796 */ 1797 struct ext4_lazy_init { 1798 unsigned long li_state; 1799 struct list_head li_request_list; 1800 struct mutex li_list_mtx; 1801 }; 1802 1803 struct ext4_li_request { 1804 struct super_block *lr_super; 1805 struct ext4_sb_info *lr_sbi; 1806 ext4_group_t lr_next_group; 1807 struct list_head lr_request; 1808 unsigned long lr_next_sched; 1809 unsigned long lr_timeout; 1810 }; 1811 1812 struct ext4_features { 1813 struct kobject f_kobj; 1814 struct completion f_kobj_unregister; 1815 }; 1816 1817 /* 1818 * This structure will be used for multiple mount protection. It will be 1819 * written into the block number saved in the s_mmp_block field in the 1820 * superblock. Programs that check MMP should assume that if 1821 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 1822 * to use the filesystem, regardless of how old the timestamp is. 1823 */ 1824 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 1825 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 1826 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 1827 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 1828 1829 struct mmp_struct { 1830 __le32 mmp_magic; /* Magic number for MMP */ 1831 __le32 mmp_seq; /* Sequence no. updated periodically */ 1832 1833 /* 1834 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 1835 * purposes and do not affect the correctness of the algorithm 1836 */ 1837 __le64 mmp_time; /* Time last updated */ 1838 char mmp_nodename[64]; /* Node which last updated MMP block */ 1839 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 1840 1841 /* 1842 * mmp_check_interval is used to verify if the MMP block has been 1843 * updated on the block device. The value is updated based on the 1844 * maximum time to write the MMP block during an update cycle. 1845 */ 1846 __le16 mmp_check_interval; 1847 1848 __le16 mmp_pad1; 1849 __le32 mmp_pad2[226]; 1850 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 1851 }; 1852 1853 /* arguments passed to the mmp thread */ 1854 struct mmpd_data { 1855 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 1856 struct super_block *sb; /* super block of the fs */ 1857 }; 1858 1859 /* 1860 * Check interval multiplier 1861 * The MMP block is written every update interval and initially checked every 1862 * update interval x the multiplier (the value is then adapted based on the 1863 * write latency). The reason is that writes can be delayed under load and we 1864 * don't want readers to incorrectly assume that the filesystem is no longer 1865 * in use. 1866 */ 1867 #define EXT4_MMP_CHECK_MULT 2UL 1868 1869 /* 1870 * Minimum interval for MMP checking in seconds. 1871 */ 1872 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 1873 1874 /* 1875 * Maximum interval for MMP checking in seconds. 1876 */ 1877 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 1878 1879 /* 1880 * Function prototypes 1881 */ 1882 1883 /* 1884 * Ok, these declarations are also in <linux/kernel.h> but none of the 1885 * ext4 source programs needs to include it so they are duplicated here. 1886 */ 1887 # define NORET_TYPE /**/ 1888 # define ATTRIB_NORET __attribute__((noreturn)) 1889 # define NORET_AND noreturn, 1890 1891 /* bitmap.c */ 1892 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 1893 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 1894 struct ext4_group_desc *gdp, 1895 struct buffer_head *bh, int sz); 1896 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 1897 struct ext4_group_desc *gdp, 1898 struct buffer_head *bh, int sz); 1899 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 1900 struct ext4_group_desc *gdp, 1901 struct buffer_head *bh); 1902 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 1903 struct ext4_group_desc *gdp, 1904 struct buffer_head *bh); 1905 1906 /* balloc.c */ 1907 extern void ext4_validate_block_bitmap(struct super_block *sb, 1908 struct ext4_group_desc *desc, 1909 unsigned int block_group, 1910 struct buffer_head *bh); 1911 extern unsigned int ext4_block_group(struct super_block *sb, 1912 ext4_fsblk_t blocknr); 1913 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 1914 ext4_fsblk_t blocknr); 1915 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 1916 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 1917 ext4_group_t group); 1918 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 1919 ext4_fsblk_t goal, 1920 unsigned int flags, 1921 unsigned long *count, 1922 int *errp); 1923 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 1924 s64 nclusters, unsigned int flags); 1925 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 1926 extern void ext4_check_blocks_bitmap(struct super_block *); 1927 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 1928 ext4_group_t block_group, 1929 struct buffer_head ** bh); 1930 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1931 1932 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 1933 ext4_group_t block_group); 1934 extern int ext4_wait_block_bitmap(struct super_block *sb, 1935 ext4_group_t block_group, 1936 struct buffer_head *bh); 1937 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 1938 ext4_group_t block_group); 1939 extern void ext4_init_block_bitmap(struct super_block *sb, 1940 struct buffer_head *bh, 1941 ext4_group_t group, 1942 struct ext4_group_desc *desc); 1943 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 1944 ext4_group_t block_group, 1945 struct ext4_group_desc *gdp); 1946 extern unsigned ext4_num_overhead_clusters(struct super_block *sb, 1947 ext4_group_t block_group, 1948 struct ext4_group_desc *gdp); 1949 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 1950 1951 /* dir.c */ 1952 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 1953 struct file *, 1954 struct ext4_dir_entry_2 *, 1955 struct buffer_head *, unsigned int); 1956 #define ext4_check_dir_entry(dir, filp, de, bh, offset) \ 1957 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 1958 (de), (bh), (offset))) 1959 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 1960 __u32 minor_hash, 1961 struct ext4_dir_entry_2 *dirent); 1962 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 1963 1964 /* fsync.c */ 1965 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 1966 extern int ext4_flush_unwritten_io(struct inode *); 1967 1968 /* hash.c */ 1969 extern int ext4fs_dirhash(const char *name, int len, struct 1970 dx_hash_info *hinfo); 1971 1972 /* ialloc.c */ 1973 extern struct inode *ext4_new_inode(handle_t *, struct inode *, umode_t, 1974 const struct qstr *qstr, __u32 goal, 1975 uid_t *owner); 1976 extern void ext4_free_inode(handle_t *, struct inode *); 1977 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 1978 extern unsigned long ext4_count_free_inodes(struct super_block *); 1979 extern unsigned long ext4_count_dirs(struct super_block *); 1980 extern void ext4_check_inodes_bitmap(struct super_block *); 1981 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 1982 extern int ext4_init_inode_table(struct super_block *sb, 1983 ext4_group_t group, int barrier); 1984 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 1985 1986 /* mballoc.c */ 1987 extern long ext4_mb_stats; 1988 extern long ext4_mb_max_to_scan; 1989 extern int ext4_mb_init(struct super_block *); 1990 extern int ext4_mb_release(struct super_block *); 1991 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 1992 struct ext4_allocation_request *, int *); 1993 extern int ext4_mb_reserve_blocks(struct super_block *, int); 1994 extern void ext4_discard_preallocations(struct inode *); 1995 extern int __init ext4_init_mballoc(void); 1996 extern void ext4_exit_mballoc(void); 1997 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 1998 struct buffer_head *bh, ext4_fsblk_t block, 1999 unsigned long count, int flags); 2000 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2001 ext4_group_t ngroups); 2002 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2003 ext4_group_t i, struct ext4_group_desc *desc); 2004 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2005 ext4_fsblk_t block, unsigned long count); 2006 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2007 2008 /* inode.c */ 2009 struct buffer_head *ext4_getblk(handle_t *, struct inode *, 2010 ext4_lblk_t, int, int *); 2011 struct buffer_head *ext4_bread(handle_t *, struct inode *, 2012 ext4_lblk_t, int, int *); 2013 int ext4_get_block(struct inode *inode, sector_t iblock, 2014 struct buffer_head *bh_result, int create); 2015 2016 extern struct inode *ext4_iget(struct super_block *, unsigned long); 2017 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2018 extern int ext4_setattr(struct dentry *, struct iattr *); 2019 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 2020 struct kstat *stat); 2021 extern void ext4_evict_inode(struct inode *); 2022 extern void ext4_clear_inode(struct inode *); 2023 extern int ext4_sync_inode(handle_t *, struct inode *); 2024 extern void ext4_dirty_inode(struct inode *, int); 2025 extern int ext4_change_inode_journal_flag(struct inode *, int); 2026 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2027 extern int ext4_can_truncate(struct inode *inode); 2028 extern void ext4_truncate(struct inode *); 2029 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length); 2030 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 2031 extern void ext4_set_inode_flags(struct inode *); 2032 extern void ext4_get_inode_flags(struct ext4_inode_info *); 2033 extern int ext4_alloc_da_blocks(struct inode *inode); 2034 extern void ext4_set_aops(struct inode *inode); 2035 extern int ext4_writepage_trans_blocks(struct inode *); 2036 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2037 extern int ext4_discard_partial_page_buffers(handle_t *handle, 2038 struct address_space *mapping, loff_t from, 2039 loff_t length, int flags); 2040 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 2041 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2042 extern void ext4_da_update_reserve_space(struct inode *inode, 2043 int used, int quota_claim); 2044 2045 /* indirect.c */ 2046 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2047 struct ext4_map_blocks *map, int flags); 2048 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb, 2049 const struct iovec *iov, loff_t offset, 2050 unsigned long nr_segs); 2051 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2052 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk); 2053 extern void ext4_ind_truncate(struct inode *inode); 2054 2055 /* ioctl.c */ 2056 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2057 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2058 2059 /* migrate.c */ 2060 extern int ext4_ext_migrate(struct inode *); 2061 2062 /* namei.c */ 2063 extern int ext4_dirent_csum_verify(struct inode *inode, 2064 struct ext4_dir_entry *dirent); 2065 extern int ext4_orphan_add(handle_t *, struct inode *); 2066 extern int ext4_orphan_del(handle_t *, struct inode *); 2067 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2068 __u32 start_minor_hash, __u32 *next_hash); 2069 2070 /* resize.c */ 2071 extern int ext4_group_add(struct super_block *sb, 2072 struct ext4_new_group_data *input); 2073 extern int ext4_group_extend(struct super_block *sb, 2074 struct ext4_super_block *es, 2075 ext4_fsblk_t n_blocks_count); 2076 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2077 2078 /* super.c */ 2079 extern int ext4_calculate_overhead(struct super_block *sb); 2080 extern int ext4_superblock_csum_verify(struct super_block *sb, 2081 struct ext4_super_block *es); 2082 extern void ext4_superblock_csum_set(struct super_block *sb); 2083 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 2084 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 2085 extern void ext4_kvfree(void *ptr); 2086 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2087 ext4_group_t ngroup); 2088 extern __printf(4, 5) 2089 void __ext4_error(struct super_block *, const char *, unsigned int, 2090 const char *, ...); 2091 #define ext4_error(sb, message...) __ext4_error(sb, __func__, \ 2092 __LINE__, ## message) 2093 extern __printf(5, 6) 2094 void ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2095 const char *, ...); 2096 extern __printf(5, 6) 2097 void ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2098 const char *, ...); 2099 extern void __ext4_std_error(struct super_block *, const char *, 2100 unsigned int, int); 2101 extern __printf(4, 5) 2102 void __ext4_abort(struct super_block *, const char *, unsigned int, 2103 const char *, ...); 2104 #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \ 2105 __LINE__, ## message) 2106 extern __printf(4, 5) 2107 void __ext4_warning(struct super_block *, const char *, unsigned int, 2108 const char *, ...); 2109 #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \ 2110 __LINE__, ## message) 2111 extern __printf(3, 4) 2112 void ext4_msg(struct super_block *, const char *, const char *, ...); 2113 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2114 const char *, unsigned int, const char *); 2115 #define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \ 2116 __LINE__, msg) 2117 extern __printf(7, 8) 2118 void __ext4_grp_locked_error(const char *, unsigned int, 2119 struct super_block *, ext4_group_t, 2120 unsigned long, ext4_fsblk_t, 2121 const char *, ...); 2122 #define ext4_grp_locked_error(sb, grp, message...) \ 2123 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message) 2124 extern void ext4_update_dynamic_rev(struct super_block *sb); 2125 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2126 __u32 compat); 2127 extern int ext4_update_rocompat_feature(handle_t *handle, 2128 struct super_block *sb, __u32 rocompat); 2129 extern int ext4_update_incompat_feature(handle_t *handle, 2130 struct super_block *sb, __u32 incompat); 2131 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2132 struct ext4_group_desc *bg); 2133 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2134 struct ext4_group_desc *bg); 2135 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2136 struct ext4_group_desc *bg); 2137 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2138 struct ext4_group_desc *bg); 2139 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2140 struct ext4_group_desc *bg); 2141 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2142 struct ext4_group_desc *bg); 2143 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2144 struct ext4_group_desc *bg); 2145 extern void ext4_block_bitmap_set(struct super_block *sb, 2146 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2147 extern void ext4_inode_bitmap_set(struct super_block *sb, 2148 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2149 extern void ext4_inode_table_set(struct super_block *sb, 2150 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2151 extern void ext4_free_group_clusters_set(struct super_block *sb, 2152 struct ext4_group_desc *bg, 2153 __u32 count); 2154 extern void ext4_free_inodes_set(struct super_block *sb, 2155 struct ext4_group_desc *bg, __u32 count); 2156 extern void ext4_used_dirs_set(struct super_block *sb, 2157 struct ext4_group_desc *bg, __u32 count); 2158 extern void ext4_itable_unused_set(struct super_block *sb, 2159 struct ext4_group_desc *bg, __u32 count); 2160 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2161 struct ext4_group_desc *gdp); 2162 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2163 struct ext4_group_desc *gdp); 2164 2165 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2166 { 2167 return EXT4_HAS_RO_COMPAT_FEATURE(sb, 2168 EXT4_FEATURE_RO_COMPAT_GDT_CSUM | 2169 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM); 2170 } 2171 2172 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2173 { 2174 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2175 le32_to_cpu(es->s_blocks_count_lo); 2176 } 2177 2178 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2179 { 2180 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2181 le32_to_cpu(es->s_r_blocks_count_lo); 2182 } 2183 2184 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2185 { 2186 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2187 le32_to_cpu(es->s_free_blocks_count_lo); 2188 } 2189 2190 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2191 ext4_fsblk_t blk) 2192 { 2193 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2194 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2195 } 2196 2197 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2198 ext4_fsblk_t blk) 2199 { 2200 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2201 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2202 } 2203 2204 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2205 ext4_fsblk_t blk) 2206 { 2207 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2208 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2209 } 2210 2211 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 2212 { 2213 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2214 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2215 le32_to_cpu(raw_inode->i_size_lo); 2216 else 2217 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2218 } 2219 2220 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2221 { 2222 raw_inode->i_size_lo = cpu_to_le32(i_size); 2223 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2224 } 2225 2226 static inline 2227 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2228 ext4_group_t group) 2229 { 2230 struct ext4_group_info ***grp_info; 2231 long indexv, indexh; 2232 grp_info = EXT4_SB(sb)->s_group_info; 2233 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2234 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2235 return grp_info[indexv][indexh]; 2236 } 2237 2238 /* 2239 * Reading s_groups_count requires using smp_rmb() afterwards. See 2240 * the locking protocol documented in the comments of ext4_group_add() 2241 * in resize.c 2242 */ 2243 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2244 { 2245 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2246 2247 smp_rmb(); 2248 return ngroups; 2249 } 2250 2251 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2252 ext4_group_t block_group) 2253 { 2254 return block_group >> sbi->s_log_groups_per_flex; 2255 } 2256 2257 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2258 { 2259 return 1 << sbi->s_log_groups_per_flex; 2260 } 2261 2262 #define ext4_std_error(sb, errno) \ 2263 do { \ 2264 if ((errno)) \ 2265 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2266 } while (0) 2267 2268 #ifdef CONFIG_SMP 2269 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2270 * counters. So we need to make sure we have free clusters more 2271 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2272 */ 2273 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2274 #else 2275 #define EXT4_FREECLUSTERS_WATERMARK 0 2276 #endif 2277 2278 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2279 { 2280 /* 2281 * XXX: replace with spinlock if seen contended -bzzz 2282 */ 2283 down_write(&EXT4_I(inode)->i_data_sem); 2284 if (newsize > EXT4_I(inode)->i_disksize) 2285 EXT4_I(inode)->i_disksize = newsize; 2286 up_write(&EXT4_I(inode)->i_data_sem); 2287 return ; 2288 } 2289 2290 struct ext4_group_info { 2291 unsigned long bb_state; 2292 struct rb_root bb_free_root; 2293 ext4_grpblk_t bb_first_free; /* first free block */ 2294 ext4_grpblk_t bb_free; /* total free blocks */ 2295 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 2296 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 2297 struct list_head bb_prealloc_list; 2298 #ifdef DOUBLE_CHECK 2299 void *bb_bitmap; 2300 #endif 2301 struct rw_semaphore alloc_sem; 2302 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2303 * regions, index is order. 2304 * bb_counters[3] = 5 means 2305 * 5 free 8-block regions. */ 2306 }; 2307 2308 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 2309 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 2310 2311 #define EXT4_MB_GRP_NEED_INIT(grp) \ 2312 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 2313 2314 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 2315 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2316 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 2317 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2318 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 2319 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2320 2321 #define EXT4_MAX_CONTENTION 8 2322 #define EXT4_CONTENTION_THRESHOLD 2 2323 2324 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2325 ext4_group_t group) 2326 { 2327 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2328 } 2329 2330 /* 2331 * Returns true if the filesystem is busy enough that attempts to 2332 * access the block group locks has run into contention. 2333 */ 2334 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 2335 { 2336 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 2337 } 2338 2339 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 2340 { 2341 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 2342 if (spin_trylock(lock)) 2343 /* 2344 * We're able to grab the lock right away, so drop the 2345 * lock contention counter. 2346 */ 2347 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 2348 else { 2349 /* 2350 * The lock is busy, so bump the contention counter, 2351 * and then wait on the spin lock. 2352 */ 2353 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 2354 EXT4_MAX_CONTENTION); 2355 spin_lock(lock); 2356 } 2357 } 2358 2359 static inline void ext4_unlock_group(struct super_block *sb, 2360 ext4_group_t group) 2361 { 2362 spin_unlock(ext4_group_lock_ptr(sb, group)); 2363 } 2364 2365 /* 2366 * Block validity checking 2367 */ 2368 #define ext4_check_indirect_blockref(inode, bh) \ 2369 ext4_check_blockref(__func__, __LINE__, inode, \ 2370 (__le32 *)(bh)->b_data, \ 2371 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 2372 2373 #define ext4_ind_check_inode(inode) \ 2374 ext4_check_blockref(__func__, __LINE__, inode, \ 2375 EXT4_I(inode)->i_data, \ 2376 EXT4_NDIR_BLOCKS) 2377 2378 /* 2379 * Inodes and files operations 2380 */ 2381 2382 /* dir.c */ 2383 extern const struct file_operations ext4_dir_operations; 2384 2385 /* file.c */ 2386 extern const struct inode_operations ext4_file_inode_operations; 2387 extern const struct file_operations ext4_file_operations; 2388 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 2389 extern void ext4_unwritten_wait(struct inode *inode); 2390 2391 /* namei.c */ 2392 extern const struct inode_operations ext4_dir_inode_operations; 2393 extern const struct inode_operations ext4_special_inode_operations; 2394 extern struct dentry *ext4_get_parent(struct dentry *child); 2395 2396 /* symlink.c */ 2397 extern const struct inode_operations ext4_symlink_inode_operations; 2398 extern const struct inode_operations ext4_fast_symlink_inode_operations; 2399 2400 /* block_validity */ 2401 extern void ext4_release_system_zone(struct super_block *sb); 2402 extern int ext4_setup_system_zone(struct super_block *sb); 2403 extern int __init ext4_init_system_zone(void); 2404 extern void ext4_exit_system_zone(void); 2405 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 2406 ext4_fsblk_t start_blk, 2407 unsigned int count); 2408 extern int ext4_check_blockref(const char *, unsigned int, 2409 struct inode *, __le32 *, unsigned int); 2410 2411 /* extents.c */ 2412 struct ext4_ext_path; 2413 struct ext4_extent; 2414 2415 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 2416 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 2417 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, 2418 int chunk); 2419 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 2420 struct ext4_map_blocks *map, int flags); 2421 extern void ext4_ext_truncate(struct inode *); 2422 extern int ext4_ext_punch_hole(struct file *file, loff_t offset, 2423 loff_t length); 2424 extern void ext4_ext_init(struct super_block *); 2425 extern void ext4_ext_release(struct super_block *); 2426 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 2427 loff_t len); 2428 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset, 2429 ssize_t len); 2430 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 2431 struct ext4_map_blocks *map, int flags); 2432 extern int ext4_ext_calc_metadata_amount(struct inode *inode, 2433 ext4_lblk_t lblocks); 2434 extern int ext4_extent_tree_init(handle_t *, struct inode *); 2435 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 2436 int num, 2437 struct ext4_ext_path *path); 2438 extern int ext4_can_extents_be_merged(struct inode *inode, 2439 struct ext4_extent *ex1, 2440 struct ext4_extent *ex2); 2441 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 2442 struct ext4_ext_path *, 2443 struct ext4_extent *, int); 2444 extern struct ext4_ext_path *ext4_ext_find_extent(struct inode *, ext4_lblk_t, 2445 struct ext4_ext_path *); 2446 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 2447 extern int ext4_ext_check_inode(struct inode *inode); 2448 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk); 2449 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2450 __u64 start, __u64 len); 2451 2452 2453 /* move_extent.c */ 2454 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 2455 __u64 start_orig, __u64 start_donor, 2456 __u64 len, __u64 *moved_len); 2457 2458 /* page-io.c */ 2459 extern int __init ext4_init_pageio(void); 2460 extern void ext4_add_complete_io(ext4_io_end_t *io_end); 2461 extern void ext4_exit_pageio(void); 2462 extern void ext4_ioend_wait(struct inode *); 2463 extern void ext4_free_io_end(ext4_io_end_t *io); 2464 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 2465 extern void ext4_io_submit(struct ext4_io_submit *io); 2466 extern int ext4_bio_write_page(struct ext4_io_submit *io, 2467 struct page *page, 2468 int len, 2469 struct writeback_control *wbc); 2470 2471 /* mmp.c */ 2472 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 2473 extern void ext4_mmp_csum_set(struct super_block *sb, struct mmp_struct *mmp); 2474 extern int ext4_mmp_csum_verify(struct super_block *sb, 2475 struct mmp_struct *mmp); 2476 2477 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */ 2478 enum ext4_state_bits { 2479 BH_Uninit /* blocks are allocated but uninitialized on disk */ 2480 = BH_JBDPrivateStart, 2481 BH_AllocFromCluster, /* allocated blocks were part of already 2482 * allocated cluster. Note that this flag will 2483 * never, ever appear in a buffer_head's state 2484 * flag. See EXT4_MAP_FROM_CLUSTER to see where 2485 * this is used. */ 2486 }; 2487 2488 BUFFER_FNS(Uninit, uninit) 2489 TAS_BUFFER_FNS(Uninit, uninit) 2490 2491 /* 2492 * Add new method to test wether block and inode bitmaps are properly 2493 * initialized. With uninit_bg reading the block from disk is not enough 2494 * to mark the bitmap uptodate. We need to also zero-out the bitmap 2495 */ 2496 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 2497 2498 static inline int bitmap_uptodate(struct buffer_head *bh) 2499 { 2500 return (buffer_uptodate(bh) && 2501 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 2502 } 2503 static inline void set_bitmap_uptodate(struct buffer_head *bh) 2504 { 2505 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 2506 } 2507 2508 /* 2509 * Disable DIO read nolock optimization, so new dioreaders will be forced 2510 * to grab i_mutex 2511 */ 2512 static inline void ext4_inode_block_unlocked_dio(struct inode *inode) 2513 { 2514 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 2515 smp_mb(); 2516 } 2517 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode) 2518 { 2519 smp_mb(); 2520 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 2521 } 2522 2523 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 2524 2525 /* For ioend & aio unwritten conversion wait queues */ 2526 #define EXT4_WQ_HASH_SZ 37 2527 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 2528 EXT4_WQ_HASH_SZ]) 2529 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\ 2530 EXT4_WQ_HASH_SZ]) 2531 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 2532 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; 2533 2534 #define EXT4_RESIZING 0 2535 extern int ext4_resize_begin(struct super_block *sb); 2536 extern void ext4_resize_end(struct super_block *sb); 2537 2538 #endif /* __KERNEL__ */ 2539 2540 #endif /* _EXT4_H */ 2541