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 #ifdef __KERNEL__ 33 #include <linux/compat.h> 34 #endif 35 36 /* 37 * The fourth extended filesystem constants/structures 38 */ 39 40 /* 41 * Define EXT4FS_DEBUG to produce debug messages 42 */ 43 #undef EXT4FS_DEBUG 44 45 /* 46 * Debug code 47 */ 48 #ifdef EXT4FS_DEBUG 49 #define ext4_debug(f, a...) \ 50 do { \ 51 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 52 __FILE__, __LINE__, __func__); \ 53 printk(KERN_DEBUG f, ## a); \ 54 } while (0) 55 #else 56 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 57 #endif 58 59 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 60 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 61 62 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 63 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 64 65 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 66 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 67 68 /* data type for block offset of block group */ 69 typedef int ext4_grpblk_t; 70 71 /* data type for filesystem-wide blocks number */ 72 typedef unsigned long long ext4_fsblk_t; 73 74 /* data type for file logical block number */ 75 typedef __u32 ext4_lblk_t; 76 77 /* data type for block group number */ 78 typedef unsigned int ext4_group_t; 79 80 /* 81 * Flags used in mballoc's allocation_context flags field. 82 * 83 * Also used to show what's going on for debugging purposes when the 84 * flag field is exported via the traceport interface 85 */ 86 87 /* prefer goal again. length */ 88 #define EXT4_MB_HINT_MERGE 0x0001 89 /* blocks already reserved */ 90 #define EXT4_MB_HINT_RESERVED 0x0002 91 /* metadata is being allocated */ 92 #define EXT4_MB_HINT_METADATA 0x0004 93 /* first blocks in the file */ 94 #define EXT4_MB_HINT_FIRST 0x0008 95 /* search for the best chunk */ 96 #define EXT4_MB_HINT_BEST 0x0010 97 /* data is being allocated */ 98 #define EXT4_MB_HINT_DATA 0x0020 99 /* don't preallocate (for tails) */ 100 #define EXT4_MB_HINT_NOPREALLOC 0x0040 101 /* allocate for locality group */ 102 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 103 /* allocate goal blocks or none */ 104 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 105 /* goal is meaningful */ 106 #define EXT4_MB_HINT_TRY_GOAL 0x0200 107 /* blocks already pre-reserved by delayed allocation */ 108 #define EXT4_MB_DELALLOC_RESERVED 0x0400 109 /* We are doing stream allocation */ 110 #define EXT4_MB_STREAM_ALLOC 0x0800 111 /* Use reserved root blocks if needed */ 112 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 113 114 struct ext4_allocation_request { 115 /* target inode for block we're allocating */ 116 struct inode *inode; 117 /* how many blocks we want to allocate */ 118 unsigned int len; 119 /* logical block in target inode */ 120 ext4_lblk_t logical; 121 /* the closest logical allocated block to the left */ 122 ext4_lblk_t lleft; 123 /* the closest logical allocated block to the right */ 124 ext4_lblk_t lright; 125 /* phys. target (a hint) */ 126 ext4_fsblk_t goal; 127 /* phys. block for the closest logical allocated block to the left */ 128 ext4_fsblk_t pleft; 129 /* phys. block for the closest logical allocated block to the right */ 130 ext4_fsblk_t pright; 131 /* flags. see above EXT4_MB_HINT_* */ 132 unsigned int flags; 133 }; 134 135 /* 136 * Logical to physical block mapping, used by ext4_map_blocks() 137 * 138 * This structure is used to pass requests into ext4_map_blocks() as 139 * well as to store the information returned by ext4_map_blocks(). It 140 * takes less room on the stack than a struct buffer_head. 141 */ 142 #define EXT4_MAP_NEW (1 << BH_New) 143 #define EXT4_MAP_MAPPED (1 << BH_Mapped) 144 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 145 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 146 #define EXT4_MAP_UNINIT (1 << BH_Uninit) 147 /* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of 148 * ext4_map_blocks wants to know whether or not the underlying cluster has 149 * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that 150 * the requested mapping was from previously mapped (or delayed allocated) 151 * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster 152 * should never appear on buffer_head's state flags. 153 */ 154 #define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster) 155 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 156 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\ 157 EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER) 158 159 struct ext4_map_blocks { 160 ext4_fsblk_t m_pblk; 161 ext4_lblk_t m_lblk; 162 unsigned int m_len; 163 unsigned int m_flags; 164 }; 165 166 /* 167 * For delayed allocation tracking 168 */ 169 struct mpage_da_data { 170 struct inode *inode; 171 sector_t b_blocknr; /* start block number of extent */ 172 size_t b_size; /* size of extent */ 173 unsigned long b_state; /* state of the extent */ 174 unsigned long first_page, next_page; /* extent of pages */ 175 struct writeback_control *wbc; 176 int io_done; 177 int pages_written; 178 int retval; 179 }; 180 181 /* 182 * Flags for ext4_io_end->flags 183 */ 184 #define EXT4_IO_END_UNWRITTEN 0x0001 185 #define EXT4_IO_END_ERROR 0x0002 186 #define EXT4_IO_END_QUEUED 0x0004 187 #define EXT4_IO_END_DIRECT 0x0008 188 #define EXT4_IO_END_IN_FSYNC 0x0010 189 190 struct ext4_io_page { 191 struct page *p_page; 192 atomic_t p_count; 193 }; 194 195 #define MAX_IO_PAGES 128 196 197 /* 198 * For converting uninitialized extents on a work queue. 199 * 200 * 'page' is only used from the writepage() path; 'pages' is only used for 201 * buffered writes; they are used to keep page references until conversion 202 * takes place. For AIO/DIO, neither field is filled in. 203 */ 204 typedef struct ext4_io_end { 205 struct list_head list; /* per-file finished IO list */ 206 struct inode *inode; /* file being written to */ 207 unsigned int flag; /* unwritten or not */ 208 struct page *page; /* for writepage() path */ 209 loff_t offset; /* offset in the file */ 210 ssize_t size; /* size of the extent */ 211 struct work_struct work; /* data work queue */ 212 struct kiocb *iocb; /* iocb struct for AIO */ 213 int result; /* error value for AIO */ 214 int num_io_pages; /* for writepages() */ 215 struct ext4_io_page *pages[MAX_IO_PAGES]; /* for writepages() */ 216 } ext4_io_end_t; 217 218 struct ext4_io_submit { 219 int io_op; 220 struct bio *io_bio; 221 ext4_io_end_t *io_end; 222 struct ext4_io_page *io_page; 223 sector_t io_next_block; 224 }; 225 226 /* 227 * Special inodes numbers 228 */ 229 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 230 #define EXT4_ROOT_INO 2 /* Root inode */ 231 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 232 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 233 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 234 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 235 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 236 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 237 238 /* First non-reserved inode for old ext4 filesystems */ 239 #define EXT4_GOOD_OLD_FIRST_INO 11 240 241 /* 242 * Maximal count of links to a file 243 */ 244 #define EXT4_LINK_MAX 65000 245 246 /* 247 * Macro-instructions used to manage several block sizes 248 */ 249 #define EXT4_MIN_BLOCK_SIZE 1024 250 #define EXT4_MAX_BLOCK_SIZE 65536 251 #define EXT4_MIN_BLOCK_LOG_SIZE 10 252 #define EXT4_MAX_BLOCK_LOG_SIZE 16 253 #ifdef __KERNEL__ 254 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 255 #else 256 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 257 #endif 258 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 259 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 260 EXT4_SB(s)->s_cluster_bits) 261 #ifdef __KERNEL__ 262 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 263 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 264 #else 265 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 266 #endif 267 #ifdef __KERNEL__ 268 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 269 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 270 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 271 #else 272 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 273 EXT4_GOOD_OLD_INODE_SIZE : \ 274 (s)->s_inode_size) 275 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 276 EXT4_GOOD_OLD_FIRST_INO : \ 277 (s)->s_first_ino) 278 #endif 279 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 280 281 /* Translate a block number to a cluster number */ 282 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 283 /* Translate a cluster number to a block number */ 284 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 285 /* Translate # of blks to # of clusters */ 286 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 287 (sbi)->s_cluster_bits) 288 289 /* 290 * Structure of a blocks group descriptor 291 */ 292 struct ext4_group_desc 293 { 294 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 295 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 296 __le32 bg_inode_table_lo; /* Inodes table block */ 297 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 298 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 299 __le16 bg_used_dirs_count_lo; /* Directories count */ 300 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 301 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ 302 __le16 bg_itable_unused_lo; /* Unused inodes count */ 303 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 304 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 305 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 306 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 307 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 308 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 309 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 310 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 311 __u32 bg_reserved2[3]; 312 }; 313 314 /* 315 * Structure of a flex block group info 316 */ 317 318 struct flex_groups { 319 atomic_t free_inodes; 320 atomic_t free_clusters; 321 atomic_t used_dirs; 322 }; 323 324 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 325 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 326 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 327 328 /* 329 * Macro-instructions used to manage group descriptors 330 */ 331 #define EXT4_MIN_DESC_SIZE 32 332 #define EXT4_MIN_DESC_SIZE_64BIT 64 333 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 334 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 335 #ifdef __KERNEL__ 336 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 337 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 338 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 339 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 340 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 341 #else 342 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 343 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 344 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 345 #endif 346 347 /* 348 * Constants relative to the data blocks 349 */ 350 #define EXT4_NDIR_BLOCKS 12 351 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 352 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 353 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 354 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 355 356 /* 357 * Inode flags 358 */ 359 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 360 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 361 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 362 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 363 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 364 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 365 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 366 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 367 /* Reserved for compression usage... */ 368 #define EXT4_DIRTY_FL 0x00000100 369 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 370 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 371 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 372 /* End compression flags --- maybe not all used */ 373 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 374 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 375 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 376 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 377 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 378 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 379 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 380 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 381 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 382 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 383 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 384 385 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 386 #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ 387 388 /* Flags that should be inherited by new inodes from their parent. */ 389 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 390 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 391 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 392 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 393 394 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 395 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 396 397 /* Flags that are appropriate for non-directories/regular files. */ 398 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 399 400 /* Mask out flags that are inappropriate for the given type of inode. */ 401 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 402 { 403 if (S_ISDIR(mode)) 404 return flags; 405 else if (S_ISREG(mode)) 406 return flags & EXT4_REG_FLMASK; 407 else 408 return flags & EXT4_OTHER_FLMASK; 409 } 410 411 /* 412 * Inode flags used for atomic set/get 413 */ 414 enum { 415 EXT4_INODE_SECRM = 0, /* Secure deletion */ 416 EXT4_INODE_UNRM = 1, /* Undelete */ 417 EXT4_INODE_COMPR = 2, /* Compress file */ 418 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 419 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 420 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 421 EXT4_INODE_NODUMP = 6, /* do not dump file */ 422 EXT4_INODE_NOATIME = 7, /* do not update atime */ 423 /* Reserved for compression usage... */ 424 EXT4_INODE_DIRTY = 8, 425 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 426 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 427 EXT4_INODE_ECOMPR = 11, /* Compression error */ 428 /* End compression flags --- maybe not all used */ 429 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 430 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 431 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 432 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 433 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 434 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 435 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 436 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 437 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 438 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 439 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 440 }; 441 442 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 443 #define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \ 444 printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \ 445 EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); } 446 447 /* 448 * Since it's pretty easy to mix up bit numbers and hex values, and we 449 * can't do a compile-time test for ENUM values, we use a run-time 450 * test to make sure that EXT4_XXX_FL is consistent with respect to 451 * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop 452 * out so it won't cost any extra space in the compiled kernel image. 453 * But it's important that these values are the same, since we are 454 * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL 455 * must be consistent with the values of FS_XXX_FL defined in 456 * include/linux/fs.h and the on-disk values found in ext2, ext3, and 457 * ext4 filesystems, and of course the values defined in e2fsprogs. 458 * 459 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 460 */ 461 static inline void ext4_check_flag_values(void) 462 { 463 CHECK_FLAG_VALUE(SECRM); 464 CHECK_FLAG_VALUE(UNRM); 465 CHECK_FLAG_VALUE(COMPR); 466 CHECK_FLAG_VALUE(SYNC); 467 CHECK_FLAG_VALUE(IMMUTABLE); 468 CHECK_FLAG_VALUE(APPEND); 469 CHECK_FLAG_VALUE(NODUMP); 470 CHECK_FLAG_VALUE(NOATIME); 471 CHECK_FLAG_VALUE(DIRTY); 472 CHECK_FLAG_VALUE(COMPRBLK); 473 CHECK_FLAG_VALUE(NOCOMPR); 474 CHECK_FLAG_VALUE(ECOMPR); 475 CHECK_FLAG_VALUE(INDEX); 476 CHECK_FLAG_VALUE(IMAGIC); 477 CHECK_FLAG_VALUE(JOURNAL_DATA); 478 CHECK_FLAG_VALUE(NOTAIL); 479 CHECK_FLAG_VALUE(DIRSYNC); 480 CHECK_FLAG_VALUE(TOPDIR); 481 CHECK_FLAG_VALUE(HUGE_FILE); 482 CHECK_FLAG_VALUE(EXTENTS); 483 CHECK_FLAG_VALUE(EA_INODE); 484 CHECK_FLAG_VALUE(EOFBLOCKS); 485 CHECK_FLAG_VALUE(RESERVED); 486 } 487 488 /* Used to pass group descriptor data when online resize is done */ 489 struct ext4_new_group_input { 490 __u32 group; /* Group number for this data */ 491 __u64 block_bitmap; /* Absolute block number of block bitmap */ 492 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 493 __u64 inode_table; /* Absolute block number of inode table start */ 494 __u32 blocks_count; /* Total number of blocks in this group */ 495 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 496 __u16 unused; 497 }; 498 499 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 500 struct compat_ext4_new_group_input { 501 u32 group; 502 compat_u64 block_bitmap; 503 compat_u64 inode_bitmap; 504 compat_u64 inode_table; 505 u32 blocks_count; 506 u16 reserved_blocks; 507 u16 unused; 508 }; 509 #endif 510 511 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 512 struct ext4_new_group_data { 513 __u32 group; 514 __u64 block_bitmap; 515 __u64 inode_bitmap; 516 __u64 inode_table; 517 __u32 blocks_count; 518 __u16 reserved_blocks; 519 __u16 unused; 520 __u32 free_blocks_count; 521 }; 522 523 /* Indexes used to index group tables in ext4_new_group_data */ 524 enum { 525 BLOCK_BITMAP = 0, /* block bitmap */ 526 INODE_BITMAP, /* inode bitmap */ 527 INODE_TABLE, /* inode tables */ 528 GROUP_TABLE_COUNT, 529 }; 530 531 /* 532 * Flags used by ext4_map_blocks() 533 */ 534 /* Allocate any needed blocks and/or convert an unitialized 535 extent to be an initialized ext4 */ 536 #define EXT4_GET_BLOCKS_CREATE 0x0001 537 /* Request the creation of an unitialized extent */ 538 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 539 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ 540 EXT4_GET_BLOCKS_CREATE) 541 /* Caller is from the delayed allocation writeout path, 542 so set the magic i_delalloc_reserve_flag after taking the 543 inode allocation semaphore for */ 544 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 545 /* caller is from the direct IO path, request to creation of an 546 unitialized extents if not allocated, split the uninitialized 547 extent if blocks has been preallocated already*/ 548 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 549 #define EXT4_GET_BLOCKS_CONVERT 0x0010 550 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 551 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 552 /* Convert extent to initialized after IO complete */ 553 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 554 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 555 /* Punch out blocks of an extent */ 556 #define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020 557 /* Don't normalize allocation size (used for fallocate) */ 558 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 559 /* Request will not result in inode size update (user for fallocate) */ 560 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 561 562 /* 563 * Flags used by ext4_free_blocks 564 */ 565 #define EXT4_FREE_BLOCKS_METADATA 0x0001 566 #define EXT4_FREE_BLOCKS_FORGET 0x0002 567 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 568 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 569 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 570 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 571 572 /* 573 * Flags used by ext4_discard_partial_page_buffers 574 */ 575 #define EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED 0x0001 576 577 /* 578 * ioctl commands 579 */ 580 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 581 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 582 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 583 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 584 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 585 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 586 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 587 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 588 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 589 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 590 #define EXT4_IOC_MIGRATE _IO('f', 9) 591 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 592 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 593 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 594 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 595 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 596 597 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 598 /* 599 * ioctl commands in 32 bit emulation 600 */ 601 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 602 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 603 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 604 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 605 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 606 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 607 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 608 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 609 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 610 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 611 #endif 612 613 /* Max physical block we can address w/o extents */ 614 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 615 616 /* 617 * Structure of an inode on the disk 618 */ 619 struct ext4_inode { 620 __le16 i_mode; /* File mode */ 621 __le16 i_uid; /* Low 16 bits of Owner Uid */ 622 __le32 i_size_lo; /* Size in bytes */ 623 __le32 i_atime; /* Access time */ 624 __le32 i_ctime; /* Inode Change time */ 625 __le32 i_mtime; /* Modification time */ 626 __le32 i_dtime; /* Deletion Time */ 627 __le16 i_gid; /* Low 16 bits of Group Id */ 628 __le16 i_links_count; /* Links count */ 629 __le32 i_blocks_lo; /* Blocks count */ 630 __le32 i_flags; /* File flags */ 631 union { 632 struct { 633 __le32 l_i_version; 634 } linux1; 635 struct { 636 __u32 h_i_translator; 637 } hurd1; 638 struct { 639 __u32 m_i_reserved1; 640 } masix1; 641 } osd1; /* OS dependent 1 */ 642 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 643 __le32 i_generation; /* File version (for NFS) */ 644 __le32 i_file_acl_lo; /* File ACL */ 645 __le32 i_size_high; 646 __le32 i_obso_faddr; /* Obsoleted fragment address */ 647 union { 648 struct { 649 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 650 __le16 l_i_file_acl_high; 651 __le16 l_i_uid_high; /* these 2 fields */ 652 __le16 l_i_gid_high; /* were reserved2[0] */ 653 __u32 l_i_reserved2; 654 } linux2; 655 struct { 656 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 657 __u16 h_i_mode_high; 658 __u16 h_i_uid_high; 659 __u16 h_i_gid_high; 660 __u32 h_i_author; 661 } hurd2; 662 struct { 663 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 664 __le16 m_i_file_acl_high; 665 __u32 m_i_reserved2[2]; 666 } masix2; 667 } osd2; /* OS dependent 2 */ 668 __le16 i_extra_isize; 669 __le16 i_pad1; 670 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 671 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 672 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 673 __le32 i_crtime; /* File Creation time */ 674 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 675 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 676 }; 677 678 struct move_extent { 679 __u32 reserved; /* should be zero */ 680 __u32 donor_fd; /* donor file descriptor */ 681 __u64 orig_start; /* logical start offset in block for orig */ 682 __u64 donor_start; /* logical start offset in block for donor */ 683 __u64 len; /* block length to be moved */ 684 __u64 moved_len; /* moved block length */ 685 }; 686 687 #define EXT4_EPOCH_BITS 2 688 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 689 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 690 691 /* 692 * Extended fields will fit into an inode if the filesystem was formatted 693 * with large inodes (-I 256 or larger) and there are not currently any EAs 694 * consuming all of the available space. For new inodes we always reserve 695 * enough space for the kernel's known extended fields, but for inodes 696 * created with an old kernel this might not have been the case. None of 697 * the extended inode fields is critical for correct filesystem operation. 698 * This macro checks if a certain field fits in the inode. Note that 699 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 700 */ 701 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 702 ((offsetof(typeof(*ext4_inode), field) + \ 703 sizeof((ext4_inode)->field)) \ 704 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 705 (einode)->i_extra_isize)) \ 706 707 static inline __le32 ext4_encode_extra_time(struct timespec *time) 708 { 709 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 710 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | 711 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); 712 } 713 714 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 715 { 716 if (sizeof(time->tv_sec) > 4) 717 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 718 << 32; 719 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 720 } 721 722 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 723 do { \ 724 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 725 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 726 (raw_inode)->xtime ## _extra = \ 727 ext4_encode_extra_time(&(inode)->xtime); \ 728 } while (0) 729 730 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 731 do { \ 732 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 733 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 734 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 735 (raw_inode)->xtime ## _extra = \ 736 ext4_encode_extra_time(&(einode)->xtime); \ 737 } while (0) 738 739 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 740 do { \ 741 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 742 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 743 ext4_decode_extra_time(&(inode)->xtime, \ 744 raw_inode->xtime ## _extra); \ 745 else \ 746 (inode)->xtime.tv_nsec = 0; \ 747 } while (0) 748 749 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 750 do { \ 751 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 752 (einode)->xtime.tv_sec = \ 753 (signed)le32_to_cpu((raw_inode)->xtime); \ 754 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 755 ext4_decode_extra_time(&(einode)->xtime, \ 756 raw_inode->xtime ## _extra); \ 757 else \ 758 (einode)->xtime.tv_nsec = 0; \ 759 } while (0) 760 761 #define i_disk_version osd1.linux1.l_i_version 762 763 #if defined(__KERNEL__) || defined(__linux__) 764 #define i_reserved1 osd1.linux1.l_i_reserved1 765 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 766 #define i_blocks_high osd2.linux2.l_i_blocks_high 767 #define i_uid_low i_uid 768 #define i_gid_low i_gid 769 #define i_uid_high osd2.linux2.l_i_uid_high 770 #define i_gid_high osd2.linux2.l_i_gid_high 771 #define i_reserved2 osd2.linux2.l_i_reserved2 772 773 #elif defined(__GNU__) 774 775 #define i_translator osd1.hurd1.h_i_translator 776 #define i_uid_high osd2.hurd2.h_i_uid_high 777 #define i_gid_high osd2.hurd2.h_i_gid_high 778 #define i_author osd2.hurd2.h_i_author 779 780 #elif defined(__masix__) 781 782 #define i_reserved1 osd1.masix1.m_i_reserved1 783 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 784 #define i_reserved2 osd2.masix2.m_i_reserved2 785 786 #endif /* defined(__KERNEL__) || defined(__linux__) */ 787 788 /* 789 * storage for cached extent 790 * If ec_len == 0, then the cache is invalid. 791 * If ec_start == 0, then the cache represents a gap (null mapping) 792 */ 793 struct ext4_ext_cache { 794 ext4_fsblk_t ec_start; 795 ext4_lblk_t ec_block; 796 __u32 ec_len; /* must be 32bit to return holes */ 797 }; 798 799 /* 800 * fourth extended file system inode data in memory 801 */ 802 struct ext4_inode_info { 803 __le32 i_data[15]; /* unconverted */ 804 __u32 i_dtime; 805 ext4_fsblk_t i_file_acl; 806 807 /* 808 * i_block_group is the number of the block group which contains 809 * this file's inode. Constant across the lifetime of the inode, 810 * it is ued for making block allocation decisions - we try to 811 * place a file's data blocks near its inode block, and new inodes 812 * near to their parent directory's inode. 813 */ 814 ext4_group_t i_block_group; 815 ext4_lblk_t i_dir_start_lookup; 816 #if (BITS_PER_LONG < 64) 817 unsigned long i_state_flags; /* Dynamic state flags */ 818 #endif 819 unsigned long i_flags; 820 821 #ifdef CONFIG_EXT4_FS_XATTR 822 /* 823 * Extended attributes can be read independently of the main file 824 * data. Taking i_mutex even when reading would cause contention 825 * between readers of EAs and writers of regular file data, so 826 * instead we synchronize on xattr_sem when reading or changing 827 * EAs. 828 */ 829 struct rw_semaphore xattr_sem; 830 #endif 831 832 struct list_head i_orphan; /* unlinked but open inodes */ 833 834 /* 835 * i_disksize keeps track of what the inode size is ON DISK, not 836 * in memory. During truncate, i_size is set to the new size by 837 * the VFS prior to calling ext4_truncate(), but the filesystem won't 838 * set i_disksize to 0 until the truncate is actually under way. 839 * 840 * The intent is that i_disksize always represents the blocks which 841 * are used by this file. This allows recovery to restart truncate 842 * on orphans if we crash during truncate. We actually write i_disksize 843 * into the on-disk inode when writing inodes out, instead of i_size. 844 * 845 * The only time when i_disksize and i_size may be different is when 846 * a truncate is in progress. The only things which change i_disksize 847 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 848 */ 849 loff_t i_disksize; 850 851 /* 852 * i_data_sem is for serialising ext4_truncate() against 853 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 854 * data tree are chopped off during truncate. We can't do that in 855 * ext4 because whenever we perform intermediate commits during 856 * truncate, the inode and all the metadata blocks *must* be in a 857 * consistent state which allows truncation of the orphans to restart 858 * during recovery. Hence we must fix the get_block-vs-truncate race 859 * by other means, so we have i_data_sem. 860 */ 861 struct rw_semaphore i_data_sem; 862 struct inode vfs_inode; 863 struct jbd2_inode *jinode; 864 865 struct ext4_ext_cache i_cached_extent; 866 /* 867 * File creation time. Its function is same as that of 868 * struct timespec i_{a,c,m}time in the generic inode. 869 */ 870 struct timespec i_crtime; 871 872 /* mballoc */ 873 struct list_head i_prealloc_list; 874 spinlock_t i_prealloc_lock; 875 876 /* ialloc */ 877 ext4_group_t i_last_alloc_group; 878 879 /* allocation reservation info for delalloc */ 880 /* In case of bigalloc, these refer to clusters rather than blocks */ 881 unsigned int i_reserved_data_blocks; 882 unsigned int i_reserved_meta_blocks; 883 unsigned int i_allocated_meta_blocks; 884 ext4_lblk_t i_da_metadata_calc_last_lblock; 885 int i_da_metadata_calc_len; 886 887 /* on-disk additional length */ 888 __u16 i_extra_isize; 889 890 #ifdef CONFIG_QUOTA 891 /* quota space reservation, managed internally by quota code */ 892 qsize_t i_reserved_quota; 893 #endif 894 895 /* completed IOs that might need unwritten extents handling */ 896 struct list_head i_completed_io_list; 897 spinlock_t i_completed_io_lock; 898 atomic_t i_ioend_count; /* Number of outstanding io_end structs */ 899 /* current io_end structure for async DIO write*/ 900 ext4_io_end_t *cur_aio_dio; 901 atomic_t i_aiodio_unwritten; /* Nr. of inflight conversions pending */ 902 903 spinlock_t i_block_reservation_lock; 904 905 /* 906 * Transactions that contain inode's metadata needed to complete 907 * fsync and fdatasync, respectively. 908 */ 909 tid_t i_sync_tid; 910 tid_t i_datasync_tid; 911 }; 912 913 /* 914 * File system states 915 */ 916 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 917 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 918 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 919 920 /* 921 * Misc. filesystem flags 922 */ 923 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 924 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 925 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 926 927 /* 928 * Mount flags 929 */ 930 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 931 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 932 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 933 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 934 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 935 #define EXT4_MOUNT_ERRORS_MASK 0x00070 936 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 937 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 938 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 939 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 940 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 941 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 942 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 943 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 944 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 945 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 946 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 947 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 948 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 949 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 950 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 951 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 952 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 953 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 954 #define EXT4_MOUNT_MBLK_IO_SUBMIT 0x4000000 /* multi-block io submits */ 955 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 956 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 957 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 958 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 959 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 960 961 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 962 specified delalloc */ 963 964 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 965 ~EXT4_MOUNT_##opt 966 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 967 EXT4_MOUNT_##opt 968 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 969 EXT4_MOUNT_##opt) 970 971 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 972 ~EXT4_MOUNT2_##opt 973 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 974 EXT4_MOUNT2_##opt 975 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 976 EXT4_MOUNT2_##opt) 977 978 #define ext4_test_and_set_bit __test_and_set_bit_le 979 #define ext4_set_bit __set_bit_le 980 #define ext4_set_bit_atomic ext2_set_bit_atomic 981 #define ext4_test_and_clear_bit __test_and_clear_bit_le 982 #define ext4_clear_bit __clear_bit_le 983 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 984 #define ext4_test_bit test_bit_le 985 #define ext4_find_next_zero_bit find_next_zero_bit_le 986 #define ext4_find_next_bit find_next_bit_le 987 988 extern void ext4_set_bits(void *bm, int cur, int len); 989 990 /* 991 * Maximal mount counts between two filesystem checks 992 */ 993 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 994 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 995 996 /* 997 * Behaviour when detecting errors 998 */ 999 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1000 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1001 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1002 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1003 1004 /* 1005 * Structure of the super block 1006 */ 1007 struct ext4_super_block { 1008 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1009 __le32 s_blocks_count_lo; /* Blocks count */ 1010 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1011 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1012 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1013 __le32 s_first_data_block; /* First Data Block */ 1014 __le32 s_log_block_size; /* Block size */ 1015 __le32 s_log_cluster_size; /* Allocation cluster size */ 1016 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1017 __le32 s_clusters_per_group; /* # Clusters per group */ 1018 __le32 s_inodes_per_group; /* # Inodes per group */ 1019 __le32 s_mtime; /* Mount time */ 1020 /*30*/ __le32 s_wtime; /* Write time */ 1021 __le16 s_mnt_count; /* Mount count */ 1022 __le16 s_max_mnt_count; /* Maximal mount count */ 1023 __le16 s_magic; /* Magic signature */ 1024 __le16 s_state; /* File system state */ 1025 __le16 s_errors; /* Behaviour when detecting errors */ 1026 __le16 s_minor_rev_level; /* minor revision level */ 1027 /*40*/ __le32 s_lastcheck; /* time of last check */ 1028 __le32 s_checkinterval; /* max. time between checks */ 1029 __le32 s_creator_os; /* OS */ 1030 __le32 s_rev_level; /* Revision level */ 1031 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1032 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1033 /* 1034 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1035 * 1036 * Note: the difference between the compatible feature set and 1037 * the incompatible feature set is that if there is a bit set 1038 * in the incompatible feature set that the kernel doesn't 1039 * know about, it should refuse to mount the filesystem. 1040 * 1041 * e2fsck's requirements are more strict; if it doesn't know 1042 * about a feature in either the compatible or incompatible 1043 * feature set, it must abort and not try to meddle with 1044 * things it doesn't understand... 1045 */ 1046 __le32 s_first_ino; /* First non-reserved inode */ 1047 __le16 s_inode_size; /* size of inode structure */ 1048 __le16 s_block_group_nr; /* block group # of this superblock */ 1049 __le32 s_feature_compat; /* compatible feature set */ 1050 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1051 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1052 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1053 /*78*/ char s_volume_name[16]; /* volume name */ 1054 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 1055 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1056 /* 1057 * Performance hints. Directory preallocation should only 1058 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1059 */ 1060 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1061 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1062 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1063 /* 1064 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1065 */ 1066 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1067 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1068 __le32 s_journal_dev; /* device number of journal file */ 1069 __le32 s_last_orphan; /* start of list of inodes to delete */ 1070 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1071 __u8 s_def_hash_version; /* Default hash version to use */ 1072 __u8 s_jnl_backup_type; 1073 __le16 s_desc_size; /* size of group descriptor */ 1074 /*100*/ __le32 s_default_mount_opts; 1075 __le32 s_first_meta_bg; /* First metablock block group */ 1076 __le32 s_mkfs_time; /* When the filesystem was created */ 1077 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1078 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1079 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1080 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1081 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1082 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1083 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1084 __le32 s_flags; /* Miscellaneous flags */ 1085 __le16 s_raid_stride; /* RAID stride */ 1086 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1087 __le64 s_mmp_block; /* Block for multi-mount protection */ 1088 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1089 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1090 __u8 s_reserved_char_pad; 1091 __le16 s_reserved_pad; 1092 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1093 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1094 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1095 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1096 snapshot's future use */ 1097 __le32 s_snapshot_list; /* inode number of the head of the 1098 on-disk snapshot list */ 1099 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1100 __le32 s_error_count; /* number of fs errors */ 1101 __le32 s_first_error_time; /* first time an error happened */ 1102 __le32 s_first_error_ino; /* inode involved in first error */ 1103 __le64 s_first_error_block; /* block involved of first error */ 1104 __u8 s_first_error_func[32]; /* function where the error happened */ 1105 __le32 s_first_error_line; /* line number where error happened */ 1106 __le32 s_last_error_time; /* most recent time of an error */ 1107 __le32 s_last_error_ino; /* inode involved in last error */ 1108 __le32 s_last_error_line; /* line number where error happened */ 1109 __le64 s_last_error_block; /* block involved of last error */ 1110 __u8 s_last_error_func[32]; /* function where the error happened */ 1111 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1112 __u8 s_mount_opts[64]; 1113 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1114 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1115 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1116 __le32 s_reserved[109]; /* Padding to the end of the block */ 1117 }; 1118 1119 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1120 1121 #ifdef __KERNEL__ 1122 1123 /* 1124 * run-time mount flags 1125 */ 1126 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1127 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1128 1129 /* 1130 * fourth extended-fs super-block data in memory 1131 */ 1132 struct ext4_sb_info { 1133 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1134 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1135 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1136 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1137 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1138 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1139 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1140 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1141 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1142 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1143 unsigned long s_overhead_last; /* Last calculated overhead */ 1144 unsigned long s_blocks_last; /* Last seen block count */ 1145 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1146 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1147 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1148 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1149 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1150 struct buffer_head **s_group_desc; 1151 unsigned int s_mount_opt; 1152 unsigned int s_mount_opt2; 1153 unsigned int s_mount_flags; 1154 unsigned int s_def_mount_opt; 1155 ext4_fsblk_t s_sb_block; 1156 kuid_t s_resuid; 1157 kgid_t s_resgid; 1158 unsigned short s_mount_state; 1159 unsigned short s_pad; 1160 int s_addr_per_block_bits; 1161 int s_desc_per_block_bits; 1162 int s_inode_size; 1163 int s_first_ino; 1164 unsigned int s_inode_readahead_blks; 1165 unsigned int s_inode_goal; 1166 spinlock_t s_next_gen_lock; 1167 u32 s_next_generation; 1168 u32 s_hash_seed[4]; 1169 int s_def_hash_version; 1170 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1171 struct percpu_counter s_freeclusters_counter; 1172 struct percpu_counter s_freeinodes_counter; 1173 struct percpu_counter s_dirs_counter; 1174 struct percpu_counter s_dirtyclusters_counter; 1175 struct blockgroup_lock *s_blockgroup_lock; 1176 struct proc_dir_entry *s_proc; 1177 struct kobject s_kobj; 1178 struct completion s_kobj_unregister; 1179 1180 /* Journaling */ 1181 struct journal_s *s_journal; 1182 struct list_head s_orphan; 1183 struct mutex s_orphan_lock; 1184 unsigned long s_resize_flags; /* Flags indicating if there 1185 is a resizer */ 1186 unsigned long s_commit_interval; 1187 u32 s_max_batch_time; 1188 u32 s_min_batch_time; 1189 struct block_device *journal_bdev; 1190 #ifdef CONFIG_QUOTA 1191 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ 1192 int s_jquota_fmt; /* Format of quota to use */ 1193 #endif 1194 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1195 struct rb_root system_blks; 1196 1197 #ifdef EXTENTS_STATS 1198 /* ext4 extents stats */ 1199 unsigned long s_ext_min; 1200 unsigned long s_ext_max; 1201 unsigned long s_depth_max; 1202 spinlock_t s_ext_stats_lock; 1203 unsigned long s_ext_blocks; 1204 unsigned long s_ext_extents; 1205 #endif 1206 /* ext4 extent cache stats */ 1207 unsigned long extent_cache_hits; 1208 unsigned long extent_cache_misses; 1209 1210 /* for buddy allocator */ 1211 struct ext4_group_info ***s_group_info; 1212 struct inode *s_buddy_cache; 1213 spinlock_t s_md_lock; 1214 unsigned short *s_mb_offsets; 1215 unsigned int *s_mb_maxs; 1216 1217 /* tunables */ 1218 unsigned long s_stripe; 1219 unsigned int s_mb_stream_request; 1220 unsigned int s_mb_max_to_scan; 1221 unsigned int s_mb_min_to_scan; 1222 unsigned int s_mb_stats; 1223 unsigned int s_mb_order2_reqs; 1224 unsigned int s_mb_group_prealloc; 1225 unsigned int s_max_writeback_mb_bump; 1226 /* where last allocation was done - for stream allocation */ 1227 unsigned long s_mb_last_group; 1228 unsigned long s_mb_last_start; 1229 1230 /* stats for buddy allocator */ 1231 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1232 atomic_t s_bal_success; /* we found long enough chunks */ 1233 atomic_t s_bal_allocated; /* in blocks */ 1234 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1235 atomic_t s_bal_goals; /* goal hits */ 1236 atomic_t s_bal_breaks; /* too long searches */ 1237 atomic_t s_bal_2orders; /* 2^order hits */ 1238 spinlock_t s_bal_lock; 1239 unsigned long s_mb_buddies_generated; 1240 unsigned long long s_mb_generation_time; 1241 atomic_t s_mb_lost_chunks; 1242 atomic_t s_mb_preallocated; 1243 atomic_t s_mb_discarded; 1244 atomic_t s_lock_busy; 1245 1246 /* locality groups */ 1247 struct ext4_locality_group __percpu *s_locality_groups; 1248 1249 /* for write statistics */ 1250 unsigned long s_sectors_written_start; 1251 u64 s_kbytes_written; 1252 1253 unsigned int s_log_groups_per_flex; 1254 struct flex_groups *s_flex_groups; 1255 1256 /* workqueue for dio unwritten */ 1257 struct workqueue_struct *dio_unwritten_wq; 1258 1259 /* timer for periodic error stats printing */ 1260 struct timer_list s_err_report; 1261 1262 /* Lazy inode table initialization info */ 1263 struct ext4_li_request *s_li_request; 1264 /* Wait multiplier for lazy initialization thread */ 1265 unsigned int s_li_wait_mult; 1266 1267 /* Kernel thread for multiple mount protection */ 1268 struct task_struct *s_mmp_tsk; 1269 1270 /* record the last minlen when FITRIM is called. */ 1271 atomic_t s_last_trim_minblks; 1272 }; 1273 1274 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1275 { 1276 return sb->s_fs_info; 1277 } 1278 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1279 { 1280 return container_of(inode, struct ext4_inode_info, vfs_inode); 1281 } 1282 1283 static inline struct timespec ext4_current_time(struct inode *inode) 1284 { 1285 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1286 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1287 } 1288 1289 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1290 { 1291 return ino == EXT4_ROOT_INO || 1292 ino == EXT4_JOURNAL_INO || 1293 ino == EXT4_RESIZE_INO || 1294 (ino >= EXT4_FIRST_INO(sb) && 1295 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1296 } 1297 1298 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 1299 struct ext4_io_end *io_end) 1300 { 1301 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 1302 io_end->flag |= EXT4_IO_END_UNWRITTEN; 1303 atomic_inc(&EXT4_I(inode)->i_aiodio_unwritten); 1304 } 1305 } 1306 1307 /* 1308 * Inode dynamic state flags 1309 */ 1310 enum { 1311 EXT4_STATE_JDATA, /* journaled data exists */ 1312 EXT4_STATE_NEW, /* inode is newly created */ 1313 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1314 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1315 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1316 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1317 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1318 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1319 EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */ 1320 }; 1321 1322 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1323 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1324 { \ 1325 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1326 } \ 1327 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1328 { \ 1329 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1330 } \ 1331 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1332 { \ 1333 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1334 } 1335 1336 EXT4_INODE_BIT_FNS(flag, flags, 0) 1337 #if (BITS_PER_LONG < 64) 1338 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1339 1340 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1341 { 1342 (ei)->i_state_flags = 0; 1343 } 1344 #else 1345 EXT4_INODE_BIT_FNS(state, flags, 32) 1346 1347 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1348 { 1349 /* We depend on the fact that callers will set i_flags */ 1350 } 1351 #endif 1352 #else 1353 /* Assume that user mode programs are passing in an ext4fs superblock, not 1354 * a kernel struct super_block. This will allow us to call the feature-test 1355 * macros from user land. */ 1356 #define EXT4_SB(sb) (sb) 1357 #endif 1358 1359 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1360 1361 /* 1362 * Codes for operating systems 1363 */ 1364 #define EXT4_OS_LINUX 0 1365 #define EXT4_OS_HURD 1 1366 #define EXT4_OS_MASIX 2 1367 #define EXT4_OS_FREEBSD 3 1368 #define EXT4_OS_LITES 4 1369 1370 /* 1371 * Revision levels 1372 */ 1373 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1374 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1375 1376 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1377 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1378 1379 #define EXT4_GOOD_OLD_INODE_SIZE 128 1380 1381 /* 1382 * Feature set definitions 1383 */ 1384 1385 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1386 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1387 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1388 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1389 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1390 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1391 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1392 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1393 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1394 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1395 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1396 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1397 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1398 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1399 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1400 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1401 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1402 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1403 1404 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1405 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1406 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1407 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1408 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1409 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1410 1411 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1412 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1413 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1414 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1415 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1416 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1417 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1418 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1419 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1420 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1421 1422 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1423 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1424 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1425 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1426 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1427 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1428 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1429 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1430 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1431 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1432 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1433 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */ 1434 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1435 #define EXT4_FEATURE_INCOMPAT_INLINEDATA 0x8000 /* data in inode */ 1436 1437 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1438 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1439 EXT4_FEATURE_INCOMPAT_META_BG) 1440 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1441 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1442 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1443 1444 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1445 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1446 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1447 EXT4_FEATURE_INCOMPAT_META_BG) 1448 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1449 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1450 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1451 1452 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 1453 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1454 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1455 EXT4_FEATURE_INCOMPAT_META_BG| \ 1456 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1457 EXT4_FEATURE_INCOMPAT_64BIT| \ 1458 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1459 EXT4_FEATURE_INCOMPAT_MMP) 1460 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1461 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1462 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1463 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1464 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1465 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1466 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1467 EXT4_FEATURE_RO_COMPAT_BIGALLOC) 1468 1469 /* 1470 * Default values for user and/or group using reserved blocks 1471 */ 1472 #define EXT4_DEF_RESUID 0 1473 #define EXT4_DEF_RESGID 0 1474 1475 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1476 1477 /* 1478 * Default mount options 1479 */ 1480 #define EXT4_DEFM_DEBUG 0x0001 1481 #define EXT4_DEFM_BSDGROUPS 0x0002 1482 #define EXT4_DEFM_XATTR_USER 0x0004 1483 #define EXT4_DEFM_ACL 0x0008 1484 #define EXT4_DEFM_UID16 0x0010 1485 #define EXT4_DEFM_JMODE 0x0060 1486 #define EXT4_DEFM_JMODE_DATA 0x0020 1487 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1488 #define EXT4_DEFM_JMODE_WBACK 0x0060 1489 #define EXT4_DEFM_NOBARRIER 0x0100 1490 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1491 #define EXT4_DEFM_DISCARD 0x0400 1492 #define EXT4_DEFM_NODELALLOC 0x0800 1493 1494 /* 1495 * Default journal batch times 1496 */ 1497 #define EXT4_DEF_MIN_BATCH_TIME 0 1498 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1499 1500 /* 1501 * Minimum number of groups in a flexgroup before we separate out 1502 * directories into the first block group of a flexgroup 1503 */ 1504 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1505 1506 /* 1507 * Structure of a directory entry 1508 */ 1509 #define EXT4_NAME_LEN 255 1510 1511 struct ext4_dir_entry { 1512 __le32 inode; /* Inode number */ 1513 __le16 rec_len; /* Directory entry length */ 1514 __le16 name_len; /* Name length */ 1515 char name[EXT4_NAME_LEN]; /* File name */ 1516 }; 1517 1518 /* 1519 * The new version of the directory entry. Since EXT4 structures are 1520 * stored in intel byte order, and the name_len field could never be 1521 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1522 * file_type field. 1523 */ 1524 struct ext4_dir_entry_2 { 1525 __le32 inode; /* Inode number */ 1526 __le16 rec_len; /* Directory entry length */ 1527 __u8 name_len; /* Name length */ 1528 __u8 file_type; 1529 char name[EXT4_NAME_LEN]; /* File name */ 1530 }; 1531 1532 /* 1533 * Ext4 directory file types. Only the low 3 bits are used. The 1534 * other bits are reserved for now. 1535 */ 1536 #define EXT4_FT_UNKNOWN 0 1537 #define EXT4_FT_REG_FILE 1 1538 #define EXT4_FT_DIR 2 1539 #define EXT4_FT_CHRDEV 3 1540 #define EXT4_FT_BLKDEV 4 1541 #define EXT4_FT_FIFO 5 1542 #define EXT4_FT_SOCK 6 1543 #define EXT4_FT_SYMLINK 7 1544 1545 #define EXT4_FT_MAX 8 1546 1547 /* 1548 * EXT4_DIR_PAD defines the directory entries boundaries 1549 * 1550 * NOTE: It must be a multiple of 4 1551 */ 1552 #define EXT4_DIR_PAD 4 1553 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1554 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1555 ~EXT4_DIR_ROUND) 1556 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1557 1558 /* 1559 * If we ever get support for fs block sizes > page_size, we'll need 1560 * to remove the #if statements in the next two functions... 1561 */ 1562 static inline unsigned int 1563 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1564 { 1565 unsigned len = le16_to_cpu(dlen); 1566 1567 #if (PAGE_CACHE_SIZE >= 65536) 1568 if (len == EXT4_MAX_REC_LEN || len == 0) 1569 return blocksize; 1570 return (len & 65532) | ((len & 3) << 16); 1571 #else 1572 return len; 1573 #endif 1574 } 1575 1576 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1577 { 1578 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1579 BUG(); 1580 #if (PAGE_CACHE_SIZE >= 65536) 1581 if (len < 65536) 1582 return cpu_to_le16(len); 1583 if (len == blocksize) { 1584 if (blocksize == 65536) 1585 return cpu_to_le16(EXT4_MAX_REC_LEN); 1586 else 1587 return cpu_to_le16(0); 1588 } 1589 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 1590 #else 1591 return cpu_to_le16(len); 1592 #endif 1593 } 1594 1595 /* 1596 * Hash Tree Directory indexing 1597 * (c) Daniel Phillips, 2001 1598 */ 1599 1600 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 1601 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 1602 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 1603 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 1604 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 1605 1606 /* Legal values for the dx_root hash_version field: */ 1607 1608 #define DX_HASH_LEGACY 0 1609 #define DX_HASH_HALF_MD4 1 1610 #define DX_HASH_TEA 2 1611 #define DX_HASH_LEGACY_UNSIGNED 3 1612 #define DX_HASH_HALF_MD4_UNSIGNED 4 1613 #define DX_HASH_TEA_UNSIGNED 5 1614 1615 #ifdef __KERNEL__ 1616 1617 /* hash info structure used by the directory hash */ 1618 struct dx_hash_info 1619 { 1620 u32 hash; 1621 u32 minor_hash; 1622 int hash_version; 1623 u32 *seed; 1624 }; 1625 1626 1627 /* 32 and 64 bit signed EOF for dx directories */ 1628 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 1629 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 1630 1631 1632 /* 1633 * Control parameters used by ext4_htree_next_block 1634 */ 1635 #define HASH_NB_ALWAYS 1 1636 1637 1638 /* 1639 * Describe an inode's exact location on disk and in memory 1640 */ 1641 struct ext4_iloc 1642 { 1643 struct buffer_head *bh; 1644 unsigned long offset; 1645 ext4_group_t block_group; 1646 }; 1647 1648 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 1649 { 1650 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 1651 } 1652 1653 /* 1654 * This structure is stuffed into the struct file's private_data field 1655 * for directories. It is where we put information so that we can do 1656 * readdir operations in hash tree order. 1657 */ 1658 struct dir_private_info { 1659 struct rb_root root; 1660 struct rb_node *curr_node; 1661 struct fname *extra_fname; 1662 loff_t last_pos; 1663 __u32 curr_hash; 1664 __u32 curr_minor_hash; 1665 __u32 next_hash; 1666 }; 1667 1668 /* calculate the first block number of the group */ 1669 static inline ext4_fsblk_t 1670 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 1671 { 1672 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 1673 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 1674 } 1675 1676 /* 1677 * Special error return code only used by dx_probe() and its callers. 1678 */ 1679 #define ERR_BAD_DX_DIR -75000 1680 1681 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, 1682 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); 1683 1684 /* 1685 * Timeout and state flag for lazy initialization inode thread. 1686 */ 1687 #define EXT4_DEF_LI_WAIT_MULT 10 1688 #define EXT4_DEF_LI_MAX_START_DELAY 5 1689 #define EXT4_LAZYINIT_QUIT 0x0001 1690 #define EXT4_LAZYINIT_RUNNING 0x0002 1691 1692 /* 1693 * Lazy inode table initialization info 1694 */ 1695 struct ext4_lazy_init { 1696 unsigned long li_state; 1697 struct list_head li_request_list; 1698 struct mutex li_list_mtx; 1699 }; 1700 1701 struct ext4_li_request { 1702 struct super_block *lr_super; 1703 struct ext4_sb_info *lr_sbi; 1704 ext4_group_t lr_next_group; 1705 struct list_head lr_request; 1706 unsigned long lr_next_sched; 1707 unsigned long lr_timeout; 1708 }; 1709 1710 struct ext4_features { 1711 struct kobject f_kobj; 1712 struct completion f_kobj_unregister; 1713 }; 1714 1715 /* 1716 * This structure will be used for multiple mount protection. It will be 1717 * written into the block number saved in the s_mmp_block field in the 1718 * superblock. Programs that check MMP should assume that if 1719 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 1720 * to use the filesystem, regardless of how old the timestamp is. 1721 */ 1722 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 1723 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 1724 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 1725 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 1726 1727 struct mmp_struct { 1728 __le32 mmp_magic; /* Magic number for MMP */ 1729 __le32 mmp_seq; /* Sequence no. updated periodically */ 1730 1731 /* 1732 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 1733 * purposes and do not affect the correctness of the algorithm 1734 */ 1735 __le64 mmp_time; /* Time last updated */ 1736 char mmp_nodename[64]; /* Node which last updated MMP block */ 1737 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 1738 1739 /* 1740 * mmp_check_interval is used to verify if the MMP block has been 1741 * updated on the block device. The value is updated based on the 1742 * maximum time to write the MMP block during an update cycle. 1743 */ 1744 __le16 mmp_check_interval; 1745 1746 __le16 mmp_pad1; 1747 __le32 mmp_pad2[227]; 1748 }; 1749 1750 /* arguments passed to the mmp thread */ 1751 struct mmpd_data { 1752 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 1753 struct super_block *sb; /* super block of the fs */ 1754 }; 1755 1756 /* 1757 * Check interval multiplier 1758 * The MMP block is written every update interval and initially checked every 1759 * update interval x the multiplier (the value is then adapted based on the 1760 * write latency). The reason is that writes can be delayed under load and we 1761 * don't want readers to incorrectly assume that the filesystem is no longer 1762 * in use. 1763 */ 1764 #define EXT4_MMP_CHECK_MULT 2UL 1765 1766 /* 1767 * Minimum interval for MMP checking in seconds. 1768 */ 1769 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 1770 1771 /* 1772 * Maximum interval for MMP checking in seconds. 1773 */ 1774 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 1775 1776 /* 1777 * Function prototypes 1778 */ 1779 1780 /* 1781 * Ok, these declarations are also in <linux/kernel.h> but none of the 1782 * ext4 source programs needs to include it so they are duplicated here. 1783 */ 1784 # define NORET_TYPE /**/ 1785 # define ATTRIB_NORET __attribute__((noreturn)) 1786 # define NORET_AND noreturn, 1787 1788 /* bitmap.c */ 1789 extern unsigned int ext4_count_free(struct buffer_head *, unsigned); 1790 1791 /* balloc.c */ 1792 extern unsigned int ext4_block_group(struct super_block *sb, 1793 ext4_fsblk_t blocknr); 1794 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 1795 ext4_fsblk_t blocknr); 1796 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 1797 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 1798 ext4_group_t group); 1799 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 1800 ext4_fsblk_t goal, 1801 unsigned int flags, 1802 unsigned long *count, 1803 int *errp); 1804 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 1805 s64 nclusters, unsigned int flags); 1806 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 1807 extern void ext4_check_blocks_bitmap(struct super_block *); 1808 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 1809 ext4_group_t block_group, 1810 struct buffer_head ** bh); 1811 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1812 1813 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 1814 ext4_group_t block_group); 1815 extern int ext4_wait_block_bitmap(struct super_block *sb, 1816 ext4_group_t block_group, 1817 struct buffer_head *bh); 1818 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 1819 ext4_group_t block_group); 1820 extern void ext4_init_block_bitmap(struct super_block *sb, 1821 struct buffer_head *bh, 1822 ext4_group_t group, 1823 struct ext4_group_desc *desc); 1824 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 1825 ext4_group_t block_group, 1826 struct ext4_group_desc *gdp); 1827 extern unsigned ext4_num_overhead_clusters(struct super_block *sb, 1828 ext4_group_t block_group, 1829 struct ext4_group_desc *gdp); 1830 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 1831 1832 /* dir.c */ 1833 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 1834 struct file *, 1835 struct ext4_dir_entry_2 *, 1836 struct buffer_head *, unsigned int); 1837 #define ext4_check_dir_entry(dir, filp, de, bh, offset) \ 1838 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 1839 (de), (bh), (offset))) 1840 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 1841 __u32 minor_hash, 1842 struct ext4_dir_entry_2 *dirent); 1843 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 1844 1845 /* fsync.c */ 1846 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 1847 extern int ext4_flush_completed_IO(struct inode *); 1848 1849 /* hash.c */ 1850 extern int ext4fs_dirhash(const char *name, int len, struct 1851 dx_hash_info *hinfo); 1852 1853 /* ialloc.c */ 1854 extern struct inode *ext4_new_inode(handle_t *, struct inode *, umode_t, 1855 const struct qstr *qstr, __u32 goal, 1856 uid_t *owner); 1857 extern void ext4_free_inode(handle_t *, struct inode *); 1858 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 1859 extern unsigned long ext4_count_free_inodes(struct super_block *); 1860 extern unsigned long ext4_count_dirs(struct super_block *); 1861 extern void ext4_check_inodes_bitmap(struct super_block *); 1862 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 1863 extern int ext4_init_inode_table(struct super_block *sb, 1864 ext4_group_t group, int barrier); 1865 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 1866 1867 /* mballoc.c */ 1868 extern long ext4_mb_stats; 1869 extern long ext4_mb_max_to_scan; 1870 extern int ext4_mb_init(struct super_block *, int); 1871 extern int ext4_mb_release(struct super_block *); 1872 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 1873 struct ext4_allocation_request *, int *); 1874 extern int ext4_mb_reserve_blocks(struct super_block *, int); 1875 extern void ext4_discard_preallocations(struct inode *); 1876 extern int __init ext4_init_mballoc(void); 1877 extern void ext4_exit_mballoc(void); 1878 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 1879 struct buffer_head *bh, ext4_fsblk_t block, 1880 unsigned long count, int flags); 1881 extern int ext4_mb_add_groupinfo(struct super_block *sb, 1882 ext4_group_t i, struct ext4_group_desc *desc); 1883 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 1884 ext4_fsblk_t block, unsigned long count); 1885 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 1886 1887 /* inode.c */ 1888 struct buffer_head *ext4_getblk(handle_t *, struct inode *, 1889 ext4_lblk_t, int, int *); 1890 struct buffer_head *ext4_bread(handle_t *, struct inode *, 1891 ext4_lblk_t, int, int *); 1892 int ext4_get_block(struct inode *inode, sector_t iblock, 1893 struct buffer_head *bh_result, int create); 1894 1895 extern struct inode *ext4_iget(struct super_block *, unsigned long); 1896 extern int ext4_write_inode(struct inode *, struct writeback_control *); 1897 extern int ext4_setattr(struct dentry *, struct iattr *); 1898 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 1899 struct kstat *stat); 1900 extern void ext4_evict_inode(struct inode *); 1901 extern void ext4_clear_inode(struct inode *); 1902 extern int ext4_sync_inode(handle_t *, struct inode *); 1903 extern void ext4_dirty_inode(struct inode *, int); 1904 extern int ext4_change_inode_journal_flag(struct inode *, int); 1905 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 1906 extern int ext4_can_truncate(struct inode *inode); 1907 extern void ext4_truncate(struct inode *); 1908 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length); 1909 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 1910 extern void ext4_set_inode_flags(struct inode *); 1911 extern void ext4_get_inode_flags(struct ext4_inode_info *); 1912 extern int ext4_alloc_da_blocks(struct inode *inode); 1913 extern void ext4_set_aops(struct inode *inode); 1914 extern int ext4_writepage_trans_blocks(struct inode *); 1915 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 1916 extern int ext4_discard_partial_page_buffers(handle_t *handle, 1917 struct address_space *mapping, loff_t from, 1918 loff_t length, int flags); 1919 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 1920 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 1921 extern void ext4_da_update_reserve_space(struct inode *inode, 1922 int used, int quota_claim); 1923 1924 /* indirect.c */ 1925 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 1926 struct ext4_map_blocks *map, int flags); 1927 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb, 1928 const struct iovec *iov, loff_t offset, 1929 unsigned long nr_segs); 1930 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 1931 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk); 1932 extern void ext4_ind_truncate(struct inode *inode); 1933 1934 /* ioctl.c */ 1935 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 1936 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 1937 1938 /* migrate.c */ 1939 extern int ext4_ext_migrate(struct inode *); 1940 1941 /* namei.c */ 1942 extern int ext4_orphan_add(handle_t *, struct inode *); 1943 extern int ext4_orphan_del(handle_t *, struct inode *); 1944 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 1945 __u32 start_minor_hash, __u32 *next_hash); 1946 1947 /* resize.c */ 1948 extern int ext4_group_add(struct super_block *sb, 1949 struct ext4_new_group_data *input); 1950 extern int ext4_group_extend(struct super_block *sb, 1951 struct ext4_super_block *es, 1952 ext4_fsblk_t n_blocks_count); 1953 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 1954 1955 /* super.c */ 1956 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 1957 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 1958 extern void ext4_kvfree(void *ptr); 1959 extern __printf(4, 5) 1960 void __ext4_error(struct super_block *, const char *, unsigned int, 1961 const char *, ...); 1962 #define ext4_error(sb, message...) __ext4_error(sb, __func__, \ 1963 __LINE__, ## message) 1964 extern __printf(5, 6) 1965 void ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 1966 const char *, ...); 1967 extern __printf(5, 6) 1968 void ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 1969 const char *, ...); 1970 extern void __ext4_std_error(struct super_block *, const char *, 1971 unsigned int, int); 1972 extern __printf(4, 5) 1973 void __ext4_abort(struct super_block *, const char *, unsigned int, 1974 const char *, ...); 1975 #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \ 1976 __LINE__, ## message) 1977 extern __printf(4, 5) 1978 void __ext4_warning(struct super_block *, const char *, unsigned int, 1979 const char *, ...); 1980 #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \ 1981 __LINE__, ## message) 1982 extern __printf(3, 4) 1983 void ext4_msg(struct super_block *, const char *, const char *, ...); 1984 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 1985 const char *, unsigned int, const char *); 1986 #define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \ 1987 __LINE__, msg) 1988 extern __printf(7, 8) 1989 void __ext4_grp_locked_error(const char *, unsigned int, 1990 struct super_block *, ext4_group_t, 1991 unsigned long, ext4_fsblk_t, 1992 const char *, ...); 1993 #define ext4_grp_locked_error(sb, grp, message...) \ 1994 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message) 1995 extern void ext4_update_dynamic_rev(struct super_block *sb); 1996 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 1997 __u32 compat); 1998 extern int ext4_update_rocompat_feature(handle_t *handle, 1999 struct super_block *sb, __u32 rocompat); 2000 extern int ext4_update_incompat_feature(handle_t *handle, 2001 struct super_block *sb, __u32 incompat); 2002 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2003 struct ext4_group_desc *bg); 2004 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2005 struct ext4_group_desc *bg); 2006 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2007 struct ext4_group_desc *bg); 2008 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2009 struct ext4_group_desc *bg); 2010 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2011 struct ext4_group_desc *bg); 2012 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2013 struct ext4_group_desc *bg); 2014 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2015 struct ext4_group_desc *bg); 2016 extern void ext4_block_bitmap_set(struct super_block *sb, 2017 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2018 extern void ext4_inode_bitmap_set(struct super_block *sb, 2019 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2020 extern void ext4_inode_table_set(struct super_block *sb, 2021 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2022 extern void ext4_free_group_clusters_set(struct super_block *sb, 2023 struct ext4_group_desc *bg, 2024 __u32 count); 2025 extern void ext4_free_inodes_set(struct super_block *sb, 2026 struct ext4_group_desc *bg, __u32 count); 2027 extern void ext4_used_dirs_set(struct super_block *sb, 2028 struct ext4_group_desc *bg, __u32 count); 2029 extern void ext4_itable_unused_set(struct super_block *sb, 2030 struct ext4_group_desc *bg, __u32 count); 2031 extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group, 2032 struct ext4_group_desc *gdp); 2033 extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group, 2034 struct ext4_group_desc *gdp); 2035 2036 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2037 { 2038 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2039 le32_to_cpu(es->s_blocks_count_lo); 2040 } 2041 2042 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2043 { 2044 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2045 le32_to_cpu(es->s_r_blocks_count_lo); 2046 } 2047 2048 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2049 { 2050 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2051 le32_to_cpu(es->s_free_blocks_count_lo); 2052 } 2053 2054 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2055 ext4_fsblk_t blk) 2056 { 2057 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2058 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2059 } 2060 2061 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2062 ext4_fsblk_t blk) 2063 { 2064 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2065 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2066 } 2067 2068 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2069 ext4_fsblk_t blk) 2070 { 2071 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2072 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2073 } 2074 2075 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 2076 { 2077 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2078 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2079 le32_to_cpu(raw_inode->i_size_lo); 2080 else 2081 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2082 } 2083 2084 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2085 { 2086 raw_inode->i_size_lo = cpu_to_le32(i_size); 2087 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2088 } 2089 2090 static inline 2091 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2092 ext4_group_t group) 2093 { 2094 struct ext4_group_info ***grp_info; 2095 long indexv, indexh; 2096 grp_info = EXT4_SB(sb)->s_group_info; 2097 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2098 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2099 return grp_info[indexv][indexh]; 2100 } 2101 2102 /* 2103 * Reading s_groups_count requires using smp_rmb() afterwards. See 2104 * the locking protocol documented in the comments of ext4_group_add() 2105 * in resize.c 2106 */ 2107 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2108 { 2109 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2110 2111 smp_rmb(); 2112 return ngroups; 2113 } 2114 2115 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2116 ext4_group_t block_group) 2117 { 2118 return block_group >> sbi->s_log_groups_per_flex; 2119 } 2120 2121 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2122 { 2123 return 1 << sbi->s_log_groups_per_flex; 2124 } 2125 2126 #define ext4_std_error(sb, errno) \ 2127 do { \ 2128 if ((errno)) \ 2129 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2130 } while (0) 2131 2132 #ifdef CONFIG_SMP 2133 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2134 * counters. So we need to make sure we have free clusters more 2135 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2136 */ 2137 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2138 #else 2139 #define EXT4_FREECLUSTERS_WATERMARK 0 2140 #endif 2141 2142 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2143 { 2144 /* 2145 * XXX: replace with spinlock if seen contended -bzzz 2146 */ 2147 down_write(&EXT4_I(inode)->i_data_sem); 2148 if (newsize > EXT4_I(inode)->i_disksize) 2149 EXT4_I(inode)->i_disksize = newsize; 2150 up_write(&EXT4_I(inode)->i_data_sem); 2151 return ; 2152 } 2153 2154 struct ext4_group_info { 2155 unsigned long bb_state; 2156 struct rb_root bb_free_root; 2157 ext4_grpblk_t bb_first_free; /* first free block */ 2158 ext4_grpblk_t bb_free; /* total free blocks */ 2159 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 2160 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 2161 struct list_head bb_prealloc_list; 2162 #ifdef DOUBLE_CHECK 2163 void *bb_bitmap; 2164 #endif 2165 struct rw_semaphore alloc_sem; 2166 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2167 * regions, index is order. 2168 * bb_counters[3] = 5 means 2169 * 5 free 8-block regions. */ 2170 }; 2171 2172 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 2173 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 2174 2175 #define EXT4_MB_GRP_NEED_INIT(grp) \ 2176 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 2177 2178 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 2179 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2180 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 2181 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2182 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 2183 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2184 2185 #define EXT4_MAX_CONTENTION 8 2186 #define EXT4_CONTENTION_THRESHOLD 2 2187 2188 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2189 ext4_group_t group) 2190 { 2191 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2192 } 2193 2194 /* 2195 * Returns true if the filesystem is busy enough that attempts to 2196 * access the block group locks has run into contention. 2197 */ 2198 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 2199 { 2200 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 2201 } 2202 2203 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 2204 { 2205 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 2206 if (spin_trylock(lock)) 2207 /* 2208 * We're able to grab the lock right away, so drop the 2209 * lock contention counter. 2210 */ 2211 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 2212 else { 2213 /* 2214 * The lock is busy, so bump the contention counter, 2215 * and then wait on the spin lock. 2216 */ 2217 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 2218 EXT4_MAX_CONTENTION); 2219 spin_lock(lock); 2220 } 2221 } 2222 2223 static inline void ext4_unlock_group(struct super_block *sb, 2224 ext4_group_t group) 2225 { 2226 spin_unlock(ext4_group_lock_ptr(sb, group)); 2227 } 2228 2229 static inline void ext4_mark_super_dirty(struct super_block *sb) 2230 { 2231 if (EXT4_SB(sb)->s_journal == NULL) 2232 sb->s_dirt =1; 2233 } 2234 2235 /* 2236 * Block validity checking 2237 */ 2238 #define ext4_check_indirect_blockref(inode, bh) \ 2239 ext4_check_blockref(__func__, __LINE__, inode, \ 2240 (__le32 *)(bh)->b_data, \ 2241 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 2242 2243 #define ext4_ind_check_inode(inode) \ 2244 ext4_check_blockref(__func__, __LINE__, inode, \ 2245 EXT4_I(inode)->i_data, \ 2246 EXT4_NDIR_BLOCKS) 2247 2248 /* 2249 * Inodes and files operations 2250 */ 2251 2252 /* dir.c */ 2253 extern const struct file_operations ext4_dir_operations; 2254 2255 /* file.c */ 2256 extern const struct inode_operations ext4_file_inode_operations; 2257 extern const struct file_operations ext4_file_operations; 2258 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 2259 2260 /* namei.c */ 2261 extern const struct inode_operations ext4_dir_inode_operations; 2262 extern const struct inode_operations ext4_special_inode_operations; 2263 extern struct dentry *ext4_get_parent(struct dentry *child); 2264 2265 /* symlink.c */ 2266 extern const struct inode_operations ext4_symlink_inode_operations; 2267 extern const struct inode_operations ext4_fast_symlink_inode_operations; 2268 2269 /* block_validity */ 2270 extern void ext4_release_system_zone(struct super_block *sb); 2271 extern int ext4_setup_system_zone(struct super_block *sb); 2272 extern int __init ext4_init_system_zone(void); 2273 extern void ext4_exit_system_zone(void); 2274 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 2275 ext4_fsblk_t start_blk, 2276 unsigned int count); 2277 extern int ext4_check_blockref(const char *, unsigned int, 2278 struct inode *, __le32 *, unsigned int); 2279 2280 /* extents.c */ 2281 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 2282 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 2283 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, 2284 int chunk); 2285 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 2286 struct ext4_map_blocks *map, int flags); 2287 extern void ext4_ext_truncate(struct inode *); 2288 extern int ext4_ext_punch_hole(struct file *file, loff_t offset, 2289 loff_t length); 2290 extern void ext4_ext_init(struct super_block *); 2291 extern void ext4_ext_release(struct super_block *); 2292 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 2293 loff_t len); 2294 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset, 2295 ssize_t len); 2296 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 2297 struct ext4_map_blocks *map, int flags); 2298 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2299 __u64 start, __u64 len); 2300 /* move_extent.c */ 2301 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 2302 __u64 start_orig, __u64 start_donor, 2303 __u64 len, __u64 *moved_len); 2304 2305 /* page-io.c */ 2306 extern int __init ext4_init_pageio(void); 2307 extern void ext4_exit_pageio(void); 2308 extern void ext4_ioend_wait(struct inode *); 2309 extern void ext4_free_io_end(ext4_io_end_t *io); 2310 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 2311 extern int ext4_end_io_nolock(ext4_io_end_t *io); 2312 extern void ext4_io_submit(struct ext4_io_submit *io); 2313 extern int ext4_bio_write_page(struct ext4_io_submit *io, 2314 struct page *page, 2315 int len, 2316 struct writeback_control *wbc); 2317 2318 /* mmp.c */ 2319 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 2320 2321 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */ 2322 enum ext4_state_bits { 2323 BH_Uninit /* blocks are allocated but uninitialized on disk */ 2324 = BH_JBDPrivateStart, 2325 BH_AllocFromCluster, /* allocated blocks were part of already 2326 * allocated cluster. Note that this flag will 2327 * never, ever appear in a buffer_head's state 2328 * flag. See EXT4_MAP_FROM_CLUSTER to see where 2329 * this is used. */ 2330 BH_Da_Mapped, /* Delayed allocated block that now has a mapping. This 2331 * flag is set when ext4_map_blocks is called on a 2332 * delayed allocated block to get its real mapping. */ 2333 }; 2334 2335 BUFFER_FNS(Uninit, uninit) 2336 TAS_BUFFER_FNS(Uninit, uninit) 2337 BUFFER_FNS(Da_Mapped, da_mapped) 2338 2339 /* 2340 * Add new method to test wether block and inode bitmaps are properly 2341 * initialized. With uninit_bg reading the block from disk is not enough 2342 * to mark the bitmap uptodate. We need to also zero-out the bitmap 2343 */ 2344 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 2345 2346 static inline int bitmap_uptodate(struct buffer_head *bh) 2347 { 2348 return (buffer_uptodate(bh) && 2349 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 2350 } 2351 static inline void set_bitmap_uptodate(struct buffer_head *bh) 2352 { 2353 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 2354 } 2355 2356 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 2357 2358 /* For ioend & aio unwritten conversion wait queues */ 2359 #define EXT4_WQ_HASH_SZ 37 2360 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 2361 EXT4_WQ_HASH_SZ]) 2362 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\ 2363 EXT4_WQ_HASH_SZ]) 2364 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 2365 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; 2366 2367 #define EXT4_RESIZING 0 2368 extern int ext4_resize_begin(struct super_block *sb); 2369 extern void ext4_resize_end(struct super_block *sb); 2370 2371 #endif /* __KERNEL__ */ 2372 2373 #include "ext4_extents.h" 2374 2375 #endif /* _EXT4_H */ 2376