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(f, a...) do {} while (0) 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 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 148 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\ 149 EXT4_MAP_UNINIT) 150 151 struct ext4_map_blocks { 152 ext4_fsblk_t m_pblk; 153 ext4_lblk_t m_lblk; 154 unsigned int m_len; 155 unsigned int m_flags; 156 }; 157 158 /* 159 * For delayed allocation tracking 160 */ 161 struct mpage_da_data { 162 struct inode *inode; 163 sector_t b_blocknr; /* start block number of extent */ 164 size_t b_size; /* size of extent */ 165 unsigned long b_state; /* state of the extent */ 166 unsigned long first_page, next_page; /* extent of pages */ 167 struct writeback_control *wbc; 168 int io_done; 169 int pages_written; 170 int retval; 171 }; 172 173 /* 174 * Flags for ext4_io_end->flags 175 */ 176 #define EXT4_IO_END_UNWRITTEN 0x0001 177 #define EXT4_IO_END_ERROR 0x0002 178 179 struct ext4_io_page { 180 struct page *p_page; 181 atomic_t p_count; 182 }; 183 184 #define MAX_IO_PAGES 128 185 186 typedef struct ext4_io_end { 187 struct list_head list; /* per-file finished IO list */ 188 struct inode *inode; /* file being written to */ 189 unsigned int flag; /* unwritten or not */ 190 struct page *page; /* page struct for buffer write */ 191 loff_t offset; /* offset in the file */ 192 ssize_t size; /* size of the extent */ 193 struct work_struct work; /* data work queue */ 194 struct kiocb *iocb; /* iocb struct for AIO */ 195 int result; /* error value for AIO */ 196 int num_io_pages; 197 struct ext4_io_page *pages[MAX_IO_PAGES]; 198 } ext4_io_end_t; 199 200 struct ext4_io_submit { 201 int io_op; 202 struct bio *io_bio; 203 ext4_io_end_t *io_end; 204 struct ext4_io_page *io_page; 205 sector_t io_next_block; 206 }; 207 208 /* 209 * Special inodes numbers 210 */ 211 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 212 #define EXT4_ROOT_INO 2 /* Root inode */ 213 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 214 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 215 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 216 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 217 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 218 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 219 220 /* First non-reserved inode for old ext4 filesystems */ 221 #define EXT4_GOOD_OLD_FIRST_INO 11 222 223 /* 224 * Maximal count of links to a file 225 */ 226 #define EXT4_LINK_MAX 65000 227 228 /* 229 * Macro-instructions used to manage several block sizes 230 */ 231 #define EXT4_MIN_BLOCK_SIZE 1024 232 #define EXT4_MAX_BLOCK_SIZE 65536 233 #define EXT4_MIN_BLOCK_LOG_SIZE 10 234 #define EXT4_MAX_BLOCK_LOG_SIZE 16 235 #ifdef __KERNEL__ 236 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 237 #else 238 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 239 #endif 240 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 241 #ifdef __KERNEL__ 242 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 243 #else 244 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 245 #endif 246 #ifdef __KERNEL__ 247 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 248 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 249 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 250 #else 251 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 252 EXT4_GOOD_OLD_INODE_SIZE : \ 253 (s)->s_inode_size) 254 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 255 EXT4_GOOD_OLD_FIRST_INO : \ 256 (s)->s_first_ino) 257 #endif 258 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 259 260 /* 261 * Structure of a blocks group descriptor 262 */ 263 struct ext4_group_desc 264 { 265 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 266 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 267 __le32 bg_inode_table_lo; /* Inodes table block */ 268 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 269 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 270 __le16 bg_used_dirs_count_lo; /* Directories count */ 271 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 272 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ 273 __le16 bg_itable_unused_lo; /* Unused inodes count */ 274 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 275 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 276 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 277 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 278 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 279 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 280 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 281 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 282 __u32 bg_reserved2[3]; 283 }; 284 285 /* 286 * Structure of a flex block group info 287 */ 288 289 struct flex_groups { 290 atomic_t free_inodes; 291 atomic_t free_blocks; 292 atomic_t used_dirs; 293 }; 294 295 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 296 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 297 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 298 299 /* 300 * Macro-instructions used to manage group descriptors 301 */ 302 #define EXT4_MIN_DESC_SIZE 32 303 #define EXT4_MIN_DESC_SIZE_64BIT 64 304 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 305 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 306 #ifdef __KERNEL__ 307 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 308 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 309 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 310 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 311 #else 312 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 313 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 314 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 315 #endif 316 317 /* 318 * Constants relative to the data blocks 319 */ 320 #define EXT4_NDIR_BLOCKS 12 321 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 322 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 323 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 324 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 325 326 /* 327 * Inode flags 328 */ 329 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 330 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 331 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 332 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 333 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 334 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 335 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 336 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 337 /* Reserved for compression usage... */ 338 #define EXT4_DIRTY_FL 0x00000100 339 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 340 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 341 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 342 /* End compression flags --- maybe not all used */ 343 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 344 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 345 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 346 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 347 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 348 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 349 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 350 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 351 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 352 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 353 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 354 355 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 356 #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ 357 358 /* Flags that should be inherited by new inodes from their parent. */ 359 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 360 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\ 361 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 362 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 363 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 364 365 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 366 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 367 368 /* Flags that are appropriate for non-directories/regular files. */ 369 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 370 371 /* Mask out flags that are inappropriate for the given type of inode. */ 372 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 373 { 374 if (S_ISDIR(mode)) 375 return flags; 376 else if (S_ISREG(mode)) 377 return flags & EXT4_REG_FLMASK; 378 else 379 return flags & EXT4_OTHER_FLMASK; 380 } 381 382 /* 383 * Inode flags used for atomic set/get 384 */ 385 enum { 386 EXT4_INODE_SECRM = 0, /* Secure deletion */ 387 EXT4_INODE_UNRM = 1, /* Undelete */ 388 EXT4_INODE_COMPR = 2, /* Compress file */ 389 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 390 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 391 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 392 EXT4_INODE_NODUMP = 6, /* do not dump file */ 393 EXT4_INODE_NOATIME = 7, /* do not update atime */ 394 /* Reserved for compression usage... */ 395 EXT4_INODE_DIRTY = 8, 396 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 397 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 398 EXT4_INODE_ECOMPR = 11, /* Compression error */ 399 /* End compression flags --- maybe not all used */ 400 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 401 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 402 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 403 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 404 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 405 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 406 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 407 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 408 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 409 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 410 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 411 }; 412 413 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 414 #define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \ 415 printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \ 416 EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); } 417 418 /* 419 * Since it's pretty easy to mix up bit numbers and hex values, and we 420 * can't do a compile-time test for ENUM values, we use a run-time 421 * test to make sure that EXT4_XXX_FL is consistent with respect to 422 * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop 423 * out so it won't cost any extra space in the compiled kernel image. 424 * But it's important that these values are the same, since we are 425 * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL 426 * must be consistent with the values of FS_XXX_FL defined in 427 * include/linux/fs.h and the on-disk values found in ext2, ext3, and 428 * ext4 filesystems, and of course the values defined in e2fsprogs. 429 * 430 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 431 */ 432 static inline void ext4_check_flag_values(void) 433 { 434 CHECK_FLAG_VALUE(SECRM); 435 CHECK_FLAG_VALUE(UNRM); 436 CHECK_FLAG_VALUE(COMPR); 437 CHECK_FLAG_VALUE(SYNC); 438 CHECK_FLAG_VALUE(IMMUTABLE); 439 CHECK_FLAG_VALUE(APPEND); 440 CHECK_FLAG_VALUE(NODUMP); 441 CHECK_FLAG_VALUE(NOATIME); 442 CHECK_FLAG_VALUE(DIRTY); 443 CHECK_FLAG_VALUE(COMPRBLK); 444 CHECK_FLAG_VALUE(NOCOMPR); 445 CHECK_FLAG_VALUE(ECOMPR); 446 CHECK_FLAG_VALUE(INDEX); 447 CHECK_FLAG_VALUE(IMAGIC); 448 CHECK_FLAG_VALUE(JOURNAL_DATA); 449 CHECK_FLAG_VALUE(NOTAIL); 450 CHECK_FLAG_VALUE(DIRSYNC); 451 CHECK_FLAG_VALUE(TOPDIR); 452 CHECK_FLAG_VALUE(HUGE_FILE); 453 CHECK_FLAG_VALUE(EXTENTS); 454 CHECK_FLAG_VALUE(EA_INODE); 455 CHECK_FLAG_VALUE(EOFBLOCKS); 456 CHECK_FLAG_VALUE(RESERVED); 457 } 458 459 /* Used to pass group descriptor data when online resize is done */ 460 struct ext4_new_group_input { 461 __u32 group; /* Group number for this data */ 462 __u64 block_bitmap; /* Absolute block number of block bitmap */ 463 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 464 __u64 inode_table; /* Absolute block number of inode table start */ 465 __u32 blocks_count; /* Total number of blocks in this group */ 466 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 467 __u16 unused; 468 }; 469 470 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 471 struct compat_ext4_new_group_input { 472 u32 group; 473 compat_u64 block_bitmap; 474 compat_u64 inode_bitmap; 475 compat_u64 inode_table; 476 u32 blocks_count; 477 u16 reserved_blocks; 478 u16 unused; 479 }; 480 #endif 481 482 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 483 struct ext4_new_group_data { 484 __u32 group; 485 __u64 block_bitmap; 486 __u64 inode_bitmap; 487 __u64 inode_table; 488 __u32 blocks_count; 489 __u16 reserved_blocks; 490 __u16 unused; 491 __u32 free_blocks_count; 492 }; 493 494 /* 495 * Flags used by ext4_map_blocks() 496 */ 497 /* Allocate any needed blocks and/or convert an unitialized 498 extent to be an initialized ext4 */ 499 #define EXT4_GET_BLOCKS_CREATE 0x0001 500 /* Request the creation of an unitialized extent */ 501 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 502 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ 503 EXT4_GET_BLOCKS_CREATE) 504 /* Caller is from the delayed allocation writeout path, 505 so set the magic i_delalloc_reserve_flag after taking the 506 inode allocation semaphore for */ 507 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 508 /* caller is from the direct IO path, request to creation of an 509 unitialized extents if not allocated, split the uninitialized 510 extent if blocks has been preallocated already*/ 511 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 512 #define EXT4_GET_BLOCKS_CONVERT 0x0010 513 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 514 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 515 /* Convert extent to initialized after IO complete */ 516 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 517 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 518 /* Punch out blocks of an extent */ 519 #define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020 520 /* Don't normalize allocation size (used for fallocate) */ 521 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 522 523 /* 524 * Flags used by ext4_free_blocks 525 */ 526 #define EXT4_FREE_BLOCKS_METADATA 0x0001 527 #define EXT4_FREE_BLOCKS_FORGET 0x0002 528 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 529 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 530 531 /* 532 * ioctl commands 533 */ 534 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 535 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 536 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 537 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 538 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 539 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 540 #ifdef CONFIG_JBD2_DEBUG 541 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long) 542 #endif 543 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 544 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 545 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 546 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 547 #define EXT4_IOC_MIGRATE _IO('f', 9) 548 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 549 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 550 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 551 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 552 553 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 554 /* 555 * ioctl commands in 32 bit emulation 556 */ 557 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 558 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 559 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 560 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 561 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 562 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 563 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 564 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 565 #ifdef CONFIG_JBD2_DEBUG 566 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int) 567 #endif 568 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 569 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 570 #endif 571 572 /* Max physical block we can address w/o extents */ 573 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 574 575 /* 576 * Structure of an inode on the disk 577 */ 578 struct ext4_inode { 579 __le16 i_mode; /* File mode */ 580 __le16 i_uid; /* Low 16 bits of Owner Uid */ 581 __le32 i_size_lo; /* Size in bytes */ 582 __le32 i_atime; /* Access time */ 583 __le32 i_ctime; /* Inode Change time */ 584 __le32 i_mtime; /* Modification time */ 585 __le32 i_dtime; /* Deletion Time */ 586 __le16 i_gid; /* Low 16 bits of Group Id */ 587 __le16 i_links_count; /* Links count */ 588 __le32 i_blocks_lo; /* Blocks count */ 589 __le32 i_flags; /* File flags */ 590 union { 591 struct { 592 __le32 l_i_version; 593 } linux1; 594 struct { 595 __u32 h_i_translator; 596 } hurd1; 597 struct { 598 __u32 m_i_reserved1; 599 } masix1; 600 } osd1; /* OS dependent 1 */ 601 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 602 __le32 i_generation; /* File version (for NFS) */ 603 __le32 i_file_acl_lo; /* File ACL */ 604 __le32 i_size_high; 605 __le32 i_obso_faddr; /* Obsoleted fragment address */ 606 union { 607 struct { 608 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 609 __le16 l_i_file_acl_high; 610 __le16 l_i_uid_high; /* these 2 fields */ 611 __le16 l_i_gid_high; /* were reserved2[0] */ 612 __u32 l_i_reserved2; 613 } linux2; 614 struct { 615 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 616 __u16 h_i_mode_high; 617 __u16 h_i_uid_high; 618 __u16 h_i_gid_high; 619 __u32 h_i_author; 620 } hurd2; 621 struct { 622 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 623 __le16 m_i_file_acl_high; 624 __u32 m_i_reserved2[2]; 625 } masix2; 626 } osd2; /* OS dependent 2 */ 627 __le16 i_extra_isize; 628 __le16 i_pad1; 629 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 630 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 631 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 632 __le32 i_crtime; /* File Creation time */ 633 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 634 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 635 }; 636 637 struct move_extent { 638 __u32 reserved; /* should be zero */ 639 __u32 donor_fd; /* donor file descriptor */ 640 __u64 orig_start; /* logical start offset in block for orig */ 641 __u64 donor_start; /* logical start offset in block for donor */ 642 __u64 len; /* block length to be moved */ 643 __u64 moved_len; /* moved block length */ 644 }; 645 646 #define EXT4_EPOCH_BITS 2 647 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 648 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 649 650 /* 651 * Extended fields will fit into an inode if the filesystem was formatted 652 * with large inodes (-I 256 or larger) and there are not currently any EAs 653 * consuming all of the available space. For new inodes we always reserve 654 * enough space for the kernel's known extended fields, but for inodes 655 * created with an old kernel this might not have been the case. None of 656 * the extended inode fields is critical for correct filesystem operation. 657 * This macro checks if a certain field fits in the inode. Note that 658 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 659 */ 660 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 661 ((offsetof(typeof(*ext4_inode), field) + \ 662 sizeof((ext4_inode)->field)) \ 663 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 664 (einode)->i_extra_isize)) \ 665 666 static inline __le32 ext4_encode_extra_time(struct timespec *time) 667 { 668 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 669 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | 670 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); 671 } 672 673 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 674 { 675 if (sizeof(time->tv_sec) > 4) 676 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 677 << 32; 678 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 679 } 680 681 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 682 do { \ 683 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 684 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 685 (raw_inode)->xtime ## _extra = \ 686 ext4_encode_extra_time(&(inode)->xtime); \ 687 } while (0) 688 689 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 690 do { \ 691 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 692 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 693 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 694 (raw_inode)->xtime ## _extra = \ 695 ext4_encode_extra_time(&(einode)->xtime); \ 696 } while (0) 697 698 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 699 do { \ 700 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 701 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 702 ext4_decode_extra_time(&(inode)->xtime, \ 703 raw_inode->xtime ## _extra); \ 704 else \ 705 (inode)->xtime.tv_nsec = 0; \ 706 } while (0) 707 708 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 709 do { \ 710 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 711 (einode)->xtime.tv_sec = \ 712 (signed)le32_to_cpu((raw_inode)->xtime); \ 713 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 714 ext4_decode_extra_time(&(einode)->xtime, \ 715 raw_inode->xtime ## _extra); \ 716 else \ 717 (einode)->xtime.tv_nsec = 0; \ 718 } while (0) 719 720 #define i_disk_version osd1.linux1.l_i_version 721 722 #if defined(__KERNEL__) || defined(__linux__) 723 #define i_reserved1 osd1.linux1.l_i_reserved1 724 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 725 #define i_blocks_high osd2.linux2.l_i_blocks_high 726 #define i_uid_low i_uid 727 #define i_gid_low i_gid 728 #define i_uid_high osd2.linux2.l_i_uid_high 729 #define i_gid_high osd2.linux2.l_i_gid_high 730 #define i_reserved2 osd2.linux2.l_i_reserved2 731 732 #elif defined(__GNU__) 733 734 #define i_translator osd1.hurd1.h_i_translator 735 #define i_uid_high osd2.hurd2.h_i_uid_high 736 #define i_gid_high osd2.hurd2.h_i_gid_high 737 #define i_author osd2.hurd2.h_i_author 738 739 #elif defined(__masix__) 740 741 #define i_reserved1 osd1.masix1.m_i_reserved1 742 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 743 #define i_reserved2 osd2.masix2.m_i_reserved2 744 745 #endif /* defined(__KERNEL__) || defined(__linux__) */ 746 747 /* 748 * storage for cached extent 749 * If ec_len == 0, then the cache is invalid. 750 * If ec_start == 0, then the cache represents a gap (null mapping) 751 */ 752 struct ext4_ext_cache { 753 ext4_fsblk_t ec_start; 754 ext4_lblk_t ec_block; 755 __u32 ec_len; /* must be 32bit to return holes */ 756 }; 757 758 /* 759 * fourth extended file system inode data in memory 760 */ 761 struct ext4_inode_info { 762 __le32 i_data[15]; /* unconverted */ 763 __u32 i_dtime; 764 ext4_fsblk_t i_file_acl; 765 766 /* 767 * i_block_group is the number of the block group which contains 768 * this file's inode. Constant across the lifetime of the inode, 769 * it is ued for making block allocation decisions - we try to 770 * place a file's data blocks near its inode block, and new inodes 771 * near to their parent directory's inode. 772 */ 773 ext4_group_t i_block_group; 774 ext4_lblk_t i_dir_start_lookup; 775 #if (BITS_PER_LONG < 64) 776 unsigned long i_state_flags; /* Dynamic state flags */ 777 #endif 778 unsigned long i_flags; 779 780 #ifdef CONFIG_EXT4_FS_XATTR 781 /* 782 * Extended attributes can be read independently of the main file 783 * data. Taking i_mutex even when reading would cause contention 784 * between readers of EAs and writers of regular file data, so 785 * instead we synchronize on xattr_sem when reading or changing 786 * EAs. 787 */ 788 struct rw_semaphore xattr_sem; 789 #endif 790 791 struct list_head i_orphan; /* unlinked but open inodes */ 792 793 /* 794 * i_disksize keeps track of what the inode size is ON DISK, not 795 * in memory. During truncate, i_size is set to the new size by 796 * the VFS prior to calling ext4_truncate(), but the filesystem won't 797 * set i_disksize to 0 until the truncate is actually under way. 798 * 799 * The intent is that i_disksize always represents the blocks which 800 * are used by this file. This allows recovery to restart truncate 801 * on orphans if we crash during truncate. We actually write i_disksize 802 * into the on-disk inode when writing inodes out, instead of i_size. 803 * 804 * The only time when i_disksize and i_size may be different is when 805 * a truncate is in progress. The only things which change i_disksize 806 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 807 */ 808 loff_t i_disksize; 809 810 /* 811 * i_data_sem is for serialising ext4_truncate() against 812 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 813 * data tree are chopped off during truncate. We can't do that in 814 * ext4 because whenever we perform intermediate commits during 815 * truncate, the inode and all the metadata blocks *must* be in a 816 * consistent state which allows truncation of the orphans to restart 817 * during recovery. Hence we must fix the get_block-vs-truncate race 818 * by other means, so we have i_data_sem. 819 */ 820 struct rw_semaphore i_data_sem; 821 struct inode vfs_inode; 822 struct jbd2_inode *jinode; 823 824 struct ext4_ext_cache i_cached_extent; 825 /* 826 * File creation time. Its function is same as that of 827 * struct timespec i_{a,c,m}time in the generic inode. 828 */ 829 struct timespec i_crtime; 830 831 /* mballoc */ 832 struct list_head i_prealloc_list; 833 spinlock_t i_prealloc_lock; 834 835 /* ialloc */ 836 ext4_group_t i_last_alloc_group; 837 838 /* allocation reservation info for delalloc */ 839 unsigned int i_reserved_data_blocks; 840 unsigned int i_reserved_meta_blocks; 841 unsigned int i_allocated_meta_blocks; 842 ext4_lblk_t i_da_metadata_calc_last_lblock; 843 int i_da_metadata_calc_len; 844 845 /* on-disk additional length */ 846 __u16 i_extra_isize; 847 848 #ifdef CONFIG_QUOTA 849 /* quota space reservation, managed internally by quota code */ 850 qsize_t i_reserved_quota; 851 #endif 852 853 /* completed IOs that might need unwritten extents handling */ 854 struct list_head i_completed_io_list; 855 spinlock_t i_completed_io_lock; 856 atomic_t i_ioend_count; /* Number of outstanding io_end structs */ 857 /* current io_end structure for async DIO write*/ 858 ext4_io_end_t *cur_aio_dio; 859 atomic_t i_aiodio_unwritten; /* Nr. of inflight conversions pending */ 860 861 spinlock_t i_block_reservation_lock; 862 863 /* 864 * Transactions that contain inode's metadata needed to complete 865 * fsync and fdatasync, respectively. 866 */ 867 tid_t i_sync_tid; 868 tid_t i_datasync_tid; 869 }; 870 871 /* 872 * File system states 873 */ 874 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 875 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 876 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 877 878 /* 879 * Misc. filesystem flags 880 */ 881 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 882 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 883 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 884 885 /* 886 * Mount flags 887 */ 888 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */ 889 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 890 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 891 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 892 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 893 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 894 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 895 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 896 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 897 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 898 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 899 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 900 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 901 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 902 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 903 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 904 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 905 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 906 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 907 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 908 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 909 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 910 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 911 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 912 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */ 913 #define EXT4_MOUNT_MBLK_IO_SUBMIT 0x4000000 /* multi-block io submits */ 914 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 915 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 916 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 917 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 918 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 919 920 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 921 ~EXT4_MOUNT_##opt 922 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 923 EXT4_MOUNT_##opt 924 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 925 EXT4_MOUNT_##opt) 926 927 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 928 ~EXT4_MOUNT2_##opt 929 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 930 EXT4_MOUNT2_##opt 931 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 932 EXT4_MOUNT2_##opt) 933 934 #define ext4_set_bit __test_and_set_bit_le 935 #define ext4_set_bit_atomic ext2_set_bit_atomic 936 #define ext4_clear_bit __test_and_clear_bit_le 937 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 938 #define ext4_test_bit test_bit_le 939 #define ext4_find_first_zero_bit find_first_zero_bit_le 940 #define ext4_find_next_zero_bit find_next_zero_bit_le 941 #define ext4_find_next_bit find_next_bit_le 942 943 extern void ext4_set_bits(void *bm, int cur, int len); 944 945 /* 946 * Maximal mount counts between two filesystem checks 947 */ 948 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 949 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 950 951 /* 952 * Behaviour when detecting errors 953 */ 954 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 955 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 956 #define EXT4_ERRORS_PANIC 3 /* Panic */ 957 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 958 959 /* 960 * Structure of the super block 961 */ 962 struct ext4_super_block { 963 /*00*/ __le32 s_inodes_count; /* Inodes count */ 964 __le32 s_blocks_count_lo; /* Blocks count */ 965 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 966 __le32 s_free_blocks_count_lo; /* Free blocks count */ 967 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 968 __le32 s_first_data_block; /* First Data Block */ 969 __le32 s_log_block_size; /* Block size */ 970 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */ 971 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 972 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */ 973 __le32 s_inodes_per_group; /* # Inodes per group */ 974 __le32 s_mtime; /* Mount time */ 975 /*30*/ __le32 s_wtime; /* Write time */ 976 __le16 s_mnt_count; /* Mount count */ 977 __le16 s_max_mnt_count; /* Maximal mount count */ 978 __le16 s_magic; /* Magic signature */ 979 __le16 s_state; /* File system state */ 980 __le16 s_errors; /* Behaviour when detecting errors */ 981 __le16 s_minor_rev_level; /* minor revision level */ 982 /*40*/ __le32 s_lastcheck; /* time of last check */ 983 __le32 s_checkinterval; /* max. time between checks */ 984 __le32 s_creator_os; /* OS */ 985 __le32 s_rev_level; /* Revision level */ 986 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 987 __le16 s_def_resgid; /* Default gid for reserved blocks */ 988 /* 989 * These fields are for EXT4_DYNAMIC_REV superblocks only. 990 * 991 * Note: the difference between the compatible feature set and 992 * the incompatible feature set is that if there is a bit set 993 * in the incompatible feature set that the kernel doesn't 994 * know about, it should refuse to mount the filesystem. 995 * 996 * e2fsck's requirements are more strict; if it doesn't know 997 * about a feature in either the compatible or incompatible 998 * feature set, it must abort and not try to meddle with 999 * things it doesn't understand... 1000 */ 1001 __le32 s_first_ino; /* First non-reserved inode */ 1002 __le16 s_inode_size; /* size of inode structure */ 1003 __le16 s_block_group_nr; /* block group # of this superblock */ 1004 __le32 s_feature_compat; /* compatible feature set */ 1005 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1006 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1007 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1008 /*78*/ char s_volume_name[16]; /* volume name */ 1009 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 1010 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1011 /* 1012 * Performance hints. Directory preallocation should only 1013 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1014 */ 1015 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1016 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1017 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1018 /* 1019 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1020 */ 1021 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1022 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1023 __le32 s_journal_dev; /* device number of journal file */ 1024 __le32 s_last_orphan; /* start of list of inodes to delete */ 1025 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1026 __u8 s_def_hash_version; /* Default hash version to use */ 1027 __u8 s_jnl_backup_type; 1028 __le16 s_desc_size; /* size of group descriptor */ 1029 /*100*/ __le32 s_default_mount_opts; 1030 __le32 s_first_meta_bg; /* First metablock block group */ 1031 __le32 s_mkfs_time; /* When the filesystem was created */ 1032 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1033 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1034 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1035 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1036 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1037 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1038 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1039 __le32 s_flags; /* Miscellaneous flags */ 1040 __le16 s_raid_stride; /* RAID stride */ 1041 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1042 __le64 s_mmp_block; /* Block for multi-mount protection */ 1043 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1044 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1045 __u8 s_reserved_char_pad; 1046 __le16 s_reserved_pad; 1047 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1048 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1049 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1050 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1051 snapshot's future use */ 1052 __le32 s_snapshot_list; /* inode number of the head of the 1053 on-disk snapshot list */ 1054 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1055 __le32 s_error_count; /* number of fs errors */ 1056 __le32 s_first_error_time; /* first time an error happened */ 1057 __le32 s_first_error_ino; /* inode involved in first error */ 1058 __le64 s_first_error_block; /* block involved of first error */ 1059 __u8 s_first_error_func[32]; /* function where the error happened */ 1060 __le32 s_first_error_line; /* line number where error happened */ 1061 __le32 s_last_error_time; /* most recent time of an error */ 1062 __le32 s_last_error_ino; /* inode involved in last error */ 1063 __le32 s_last_error_line; /* line number where error happened */ 1064 __le64 s_last_error_block; /* block involved of last error */ 1065 __u8 s_last_error_func[32]; /* function where the error happened */ 1066 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1067 __u8 s_mount_opts[64]; 1068 __le32 s_reserved[112]; /* Padding to the end of the block */ 1069 }; 1070 1071 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1072 1073 #ifdef __KERNEL__ 1074 1075 /* 1076 * run-time mount flags 1077 */ 1078 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1079 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1080 1081 /* 1082 * fourth extended-fs super-block data in memory 1083 */ 1084 struct ext4_sb_info { 1085 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1086 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1087 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1088 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1089 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1090 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1091 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1092 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1093 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1094 unsigned long s_overhead_last; /* Last calculated overhead */ 1095 unsigned long s_blocks_last; /* Last seen block count */ 1096 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1097 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1098 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1099 struct buffer_head **s_group_desc; 1100 unsigned int s_mount_opt; 1101 unsigned int s_mount_opt2; 1102 unsigned int s_mount_flags; 1103 ext4_fsblk_t s_sb_block; 1104 uid_t s_resuid; 1105 gid_t s_resgid; 1106 unsigned short s_mount_state; 1107 unsigned short s_pad; 1108 int s_addr_per_block_bits; 1109 int s_desc_per_block_bits; 1110 int s_inode_size; 1111 int s_first_ino; 1112 unsigned int s_inode_readahead_blks; 1113 unsigned int s_inode_goal; 1114 spinlock_t s_next_gen_lock; 1115 u32 s_next_generation; 1116 u32 s_hash_seed[4]; 1117 int s_def_hash_version; 1118 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1119 struct percpu_counter s_freeblocks_counter; 1120 struct percpu_counter s_freeinodes_counter; 1121 struct percpu_counter s_dirs_counter; 1122 struct percpu_counter s_dirtyblocks_counter; 1123 struct blockgroup_lock *s_blockgroup_lock; 1124 struct proc_dir_entry *s_proc; 1125 struct kobject s_kobj; 1126 struct completion s_kobj_unregister; 1127 1128 /* Journaling */ 1129 struct journal_s *s_journal; 1130 struct list_head s_orphan; 1131 struct mutex s_orphan_lock; 1132 unsigned long s_resize_flags; /* Flags indicating if there 1133 is a resizer */ 1134 unsigned long s_commit_interval; 1135 u32 s_max_batch_time; 1136 u32 s_min_batch_time; 1137 struct block_device *journal_bdev; 1138 #ifdef CONFIG_JBD2_DEBUG 1139 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */ 1140 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */ 1141 #endif 1142 #ifdef CONFIG_QUOTA 1143 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ 1144 int s_jquota_fmt; /* Format of quota to use */ 1145 #endif 1146 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1147 struct rb_root system_blks; 1148 1149 #ifdef EXTENTS_STATS 1150 /* ext4 extents stats */ 1151 unsigned long s_ext_min; 1152 unsigned long s_ext_max; 1153 unsigned long s_depth_max; 1154 spinlock_t s_ext_stats_lock; 1155 unsigned long s_ext_blocks; 1156 unsigned long s_ext_extents; 1157 #endif 1158 /* ext4 extent cache stats */ 1159 unsigned long extent_cache_hits; 1160 unsigned long extent_cache_misses; 1161 1162 /* for buddy allocator */ 1163 struct ext4_group_info ***s_group_info; 1164 struct inode *s_buddy_cache; 1165 spinlock_t s_md_lock; 1166 unsigned short *s_mb_offsets; 1167 unsigned int *s_mb_maxs; 1168 1169 /* tunables */ 1170 unsigned long s_stripe; 1171 unsigned int s_mb_stream_request; 1172 unsigned int s_mb_max_to_scan; 1173 unsigned int s_mb_min_to_scan; 1174 unsigned int s_mb_stats; 1175 unsigned int s_mb_order2_reqs; 1176 unsigned int s_mb_group_prealloc; 1177 unsigned int s_max_writeback_mb_bump; 1178 /* where last allocation was done - for stream allocation */ 1179 unsigned long s_mb_last_group; 1180 unsigned long s_mb_last_start; 1181 1182 /* stats for buddy allocator */ 1183 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1184 atomic_t s_bal_success; /* we found long enough chunks */ 1185 atomic_t s_bal_allocated; /* in blocks */ 1186 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1187 atomic_t s_bal_goals; /* goal hits */ 1188 atomic_t s_bal_breaks; /* too long searches */ 1189 atomic_t s_bal_2orders; /* 2^order hits */ 1190 spinlock_t s_bal_lock; 1191 unsigned long s_mb_buddies_generated; 1192 unsigned long long s_mb_generation_time; 1193 atomic_t s_mb_lost_chunks; 1194 atomic_t s_mb_preallocated; 1195 atomic_t s_mb_discarded; 1196 atomic_t s_lock_busy; 1197 1198 /* locality groups */ 1199 struct ext4_locality_group __percpu *s_locality_groups; 1200 1201 /* for write statistics */ 1202 unsigned long s_sectors_written_start; 1203 u64 s_kbytes_written; 1204 1205 unsigned int s_log_groups_per_flex; 1206 struct flex_groups *s_flex_groups; 1207 1208 /* workqueue for dio unwritten */ 1209 struct workqueue_struct *dio_unwritten_wq; 1210 1211 /* timer for periodic error stats printing */ 1212 struct timer_list s_err_report; 1213 1214 /* Lazy inode table initialization info */ 1215 struct ext4_li_request *s_li_request; 1216 /* Wait multiplier for lazy initialization thread */ 1217 unsigned int s_li_wait_mult; 1218 1219 /* Kernel thread for multiple mount protection */ 1220 struct task_struct *s_mmp_tsk; 1221 1222 /* record the last minlen when FITRIM is called. */ 1223 atomic_t s_last_trim_minblks; 1224 }; 1225 1226 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1227 { 1228 return sb->s_fs_info; 1229 } 1230 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1231 { 1232 return container_of(inode, struct ext4_inode_info, vfs_inode); 1233 } 1234 1235 static inline struct timespec ext4_current_time(struct inode *inode) 1236 { 1237 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1238 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1239 } 1240 1241 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1242 { 1243 return ino == EXT4_ROOT_INO || 1244 ino == EXT4_JOURNAL_INO || 1245 ino == EXT4_RESIZE_INO || 1246 (ino >= EXT4_FIRST_INO(sb) && 1247 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1248 } 1249 1250 /* 1251 * Inode dynamic state flags 1252 */ 1253 enum { 1254 EXT4_STATE_JDATA, /* journaled data exists */ 1255 EXT4_STATE_NEW, /* inode is newly created */ 1256 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1257 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1258 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1259 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1260 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1261 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1262 EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */ 1263 }; 1264 1265 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1266 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1267 { \ 1268 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1269 } \ 1270 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1271 { \ 1272 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1273 } \ 1274 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1275 { \ 1276 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1277 } 1278 1279 EXT4_INODE_BIT_FNS(flag, flags, 0) 1280 #if (BITS_PER_LONG < 64) 1281 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1282 1283 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1284 { 1285 (ei)->i_state_flags = 0; 1286 } 1287 #else 1288 EXT4_INODE_BIT_FNS(state, flags, 32) 1289 1290 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1291 { 1292 /* We depend on the fact that callers will set i_flags */ 1293 } 1294 #endif 1295 #else 1296 /* Assume that user mode programs are passing in an ext4fs superblock, not 1297 * a kernel struct super_block. This will allow us to call the feature-test 1298 * macros from user land. */ 1299 #define EXT4_SB(sb) (sb) 1300 #endif 1301 1302 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1303 1304 /* 1305 * Codes for operating systems 1306 */ 1307 #define EXT4_OS_LINUX 0 1308 #define EXT4_OS_HURD 1 1309 #define EXT4_OS_MASIX 2 1310 #define EXT4_OS_FREEBSD 3 1311 #define EXT4_OS_LITES 4 1312 1313 /* 1314 * Revision levels 1315 */ 1316 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1317 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1318 1319 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1320 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1321 1322 #define EXT4_GOOD_OLD_INODE_SIZE 128 1323 1324 /* 1325 * Feature set definitions 1326 */ 1327 1328 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1329 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1330 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1331 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1332 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1333 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1334 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1335 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1336 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1337 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1338 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1339 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1340 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1341 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1342 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1343 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1344 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1345 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1346 1347 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1348 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1349 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1350 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1351 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1352 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1353 1354 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1355 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1356 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1357 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1358 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1359 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1360 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1361 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1362 1363 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1364 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1365 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1366 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1367 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1368 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1369 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1370 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1371 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1372 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1373 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1374 1375 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1376 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1377 EXT4_FEATURE_INCOMPAT_META_BG) 1378 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1379 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1380 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1381 1382 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1383 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1384 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1385 EXT4_FEATURE_INCOMPAT_META_BG) 1386 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1387 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1388 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1389 1390 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 1391 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1392 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1393 EXT4_FEATURE_INCOMPAT_META_BG| \ 1394 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1395 EXT4_FEATURE_INCOMPAT_64BIT| \ 1396 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1397 EXT4_FEATURE_INCOMPAT_MMP) 1398 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1399 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1400 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1401 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1402 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1403 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1404 EXT4_FEATURE_RO_COMPAT_HUGE_FILE) 1405 1406 /* 1407 * Default values for user and/or group using reserved blocks 1408 */ 1409 #define EXT4_DEF_RESUID 0 1410 #define EXT4_DEF_RESGID 0 1411 1412 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1413 1414 /* 1415 * Default mount options 1416 */ 1417 #define EXT4_DEFM_DEBUG 0x0001 1418 #define EXT4_DEFM_BSDGROUPS 0x0002 1419 #define EXT4_DEFM_XATTR_USER 0x0004 1420 #define EXT4_DEFM_ACL 0x0008 1421 #define EXT4_DEFM_UID16 0x0010 1422 #define EXT4_DEFM_JMODE 0x0060 1423 #define EXT4_DEFM_JMODE_DATA 0x0020 1424 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1425 #define EXT4_DEFM_JMODE_WBACK 0x0060 1426 #define EXT4_DEFM_NOBARRIER 0x0100 1427 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1428 #define EXT4_DEFM_DISCARD 0x0400 1429 #define EXT4_DEFM_NODELALLOC 0x0800 1430 1431 /* 1432 * Default journal batch times 1433 */ 1434 #define EXT4_DEF_MIN_BATCH_TIME 0 1435 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1436 1437 /* 1438 * Minimum number of groups in a flexgroup before we separate out 1439 * directories into the first block group of a flexgroup 1440 */ 1441 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1442 1443 /* 1444 * Structure of a directory entry 1445 */ 1446 #define EXT4_NAME_LEN 255 1447 1448 struct ext4_dir_entry { 1449 __le32 inode; /* Inode number */ 1450 __le16 rec_len; /* Directory entry length */ 1451 __le16 name_len; /* Name length */ 1452 char name[EXT4_NAME_LEN]; /* File name */ 1453 }; 1454 1455 /* 1456 * The new version of the directory entry. Since EXT4 structures are 1457 * stored in intel byte order, and the name_len field could never be 1458 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1459 * file_type field. 1460 */ 1461 struct ext4_dir_entry_2 { 1462 __le32 inode; /* Inode number */ 1463 __le16 rec_len; /* Directory entry length */ 1464 __u8 name_len; /* Name length */ 1465 __u8 file_type; 1466 char name[EXT4_NAME_LEN]; /* File name */ 1467 }; 1468 1469 /* 1470 * Ext4 directory file types. Only the low 3 bits are used. The 1471 * other bits are reserved for now. 1472 */ 1473 #define EXT4_FT_UNKNOWN 0 1474 #define EXT4_FT_REG_FILE 1 1475 #define EXT4_FT_DIR 2 1476 #define EXT4_FT_CHRDEV 3 1477 #define EXT4_FT_BLKDEV 4 1478 #define EXT4_FT_FIFO 5 1479 #define EXT4_FT_SOCK 6 1480 #define EXT4_FT_SYMLINK 7 1481 1482 #define EXT4_FT_MAX 8 1483 1484 /* 1485 * EXT4_DIR_PAD defines the directory entries boundaries 1486 * 1487 * NOTE: It must be a multiple of 4 1488 */ 1489 #define EXT4_DIR_PAD 4 1490 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1491 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1492 ~EXT4_DIR_ROUND) 1493 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1494 1495 /* 1496 * If we ever get support for fs block sizes > page_size, we'll need 1497 * to remove the #if statements in the next two functions... 1498 */ 1499 static inline unsigned int 1500 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1501 { 1502 unsigned len = le16_to_cpu(dlen); 1503 1504 #if (PAGE_CACHE_SIZE >= 65536) 1505 if (len == EXT4_MAX_REC_LEN || len == 0) 1506 return blocksize; 1507 return (len & 65532) | ((len & 3) << 16); 1508 #else 1509 return len; 1510 #endif 1511 } 1512 1513 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1514 { 1515 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1516 BUG(); 1517 #if (PAGE_CACHE_SIZE >= 65536) 1518 if (len < 65536) 1519 return cpu_to_le16(len); 1520 if (len == blocksize) { 1521 if (blocksize == 65536) 1522 return cpu_to_le16(EXT4_MAX_REC_LEN); 1523 else 1524 return cpu_to_le16(0); 1525 } 1526 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 1527 #else 1528 return cpu_to_le16(len); 1529 #endif 1530 } 1531 1532 /* 1533 * Hash Tree Directory indexing 1534 * (c) Daniel Phillips, 2001 1535 */ 1536 1537 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 1538 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 1539 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 1540 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 1541 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 1542 1543 /* Legal values for the dx_root hash_version field: */ 1544 1545 #define DX_HASH_LEGACY 0 1546 #define DX_HASH_HALF_MD4 1 1547 #define DX_HASH_TEA 2 1548 #define DX_HASH_LEGACY_UNSIGNED 3 1549 #define DX_HASH_HALF_MD4_UNSIGNED 4 1550 #define DX_HASH_TEA_UNSIGNED 5 1551 1552 #ifdef __KERNEL__ 1553 1554 /* hash info structure used by the directory hash */ 1555 struct dx_hash_info 1556 { 1557 u32 hash; 1558 u32 minor_hash; 1559 int hash_version; 1560 u32 *seed; 1561 }; 1562 1563 #define EXT4_HTREE_EOF 0x7fffffff 1564 1565 /* 1566 * Control parameters used by ext4_htree_next_block 1567 */ 1568 #define HASH_NB_ALWAYS 1 1569 1570 1571 /* 1572 * Describe an inode's exact location on disk and in memory 1573 */ 1574 struct ext4_iloc 1575 { 1576 struct buffer_head *bh; 1577 unsigned long offset; 1578 ext4_group_t block_group; 1579 }; 1580 1581 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 1582 { 1583 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 1584 } 1585 1586 /* 1587 * This structure is stuffed into the struct file's private_data field 1588 * for directories. It is where we put information so that we can do 1589 * readdir operations in hash tree order. 1590 */ 1591 struct dir_private_info { 1592 struct rb_root root; 1593 struct rb_node *curr_node; 1594 struct fname *extra_fname; 1595 loff_t last_pos; 1596 __u32 curr_hash; 1597 __u32 curr_minor_hash; 1598 __u32 next_hash; 1599 }; 1600 1601 /* calculate the first block number of the group */ 1602 static inline ext4_fsblk_t 1603 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 1604 { 1605 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 1606 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 1607 } 1608 1609 /* 1610 * Special error return code only used by dx_probe() and its callers. 1611 */ 1612 #define ERR_BAD_DX_DIR -75000 1613 1614 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, 1615 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); 1616 1617 /* 1618 * Timeout and state flag for lazy initialization inode thread. 1619 */ 1620 #define EXT4_DEF_LI_WAIT_MULT 10 1621 #define EXT4_DEF_LI_MAX_START_DELAY 5 1622 #define EXT4_LAZYINIT_QUIT 0x0001 1623 #define EXT4_LAZYINIT_RUNNING 0x0002 1624 1625 /* 1626 * Lazy inode table initialization info 1627 */ 1628 struct ext4_lazy_init { 1629 unsigned long li_state; 1630 struct list_head li_request_list; 1631 struct mutex li_list_mtx; 1632 }; 1633 1634 struct ext4_li_request { 1635 struct super_block *lr_super; 1636 struct ext4_sb_info *lr_sbi; 1637 ext4_group_t lr_next_group; 1638 struct list_head lr_request; 1639 unsigned long lr_next_sched; 1640 unsigned long lr_timeout; 1641 }; 1642 1643 struct ext4_features { 1644 struct kobject f_kobj; 1645 struct completion f_kobj_unregister; 1646 }; 1647 1648 /* 1649 * This structure will be used for multiple mount protection. It will be 1650 * written into the block number saved in the s_mmp_block field in the 1651 * superblock. Programs that check MMP should assume that if 1652 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 1653 * to use the filesystem, regardless of how old the timestamp is. 1654 */ 1655 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 1656 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 1657 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 1658 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 1659 1660 struct mmp_struct { 1661 __le32 mmp_magic; /* Magic number for MMP */ 1662 __le32 mmp_seq; /* Sequence no. updated periodically */ 1663 1664 /* 1665 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 1666 * purposes and do not affect the correctness of the algorithm 1667 */ 1668 __le64 mmp_time; /* Time last updated */ 1669 char mmp_nodename[64]; /* Node which last updated MMP block */ 1670 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 1671 1672 /* 1673 * mmp_check_interval is used to verify if the MMP block has been 1674 * updated on the block device. The value is updated based on the 1675 * maximum time to write the MMP block during an update cycle. 1676 */ 1677 __le16 mmp_check_interval; 1678 1679 __le16 mmp_pad1; 1680 __le32 mmp_pad2[227]; 1681 }; 1682 1683 /* arguments passed to the mmp thread */ 1684 struct mmpd_data { 1685 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 1686 struct super_block *sb; /* super block of the fs */ 1687 }; 1688 1689 /* 1690 * Check interval multiplier 1691 * The MMP block is written every update interval and initially checked every 1692 * update interval x the multiplier (the value is then adapted based on the 1693 * write latency). The reason is that writes can be delayed under load and we 1694 * don't want readers to incorrectly assume that the filesystem is no longer 1695 * in use. 1696 */ 1697 #define EXT4_MMP_CHECK_MULT 2UL 1698 1699 /* 1700 * Minimum interval for MMP checking in seconds. 1701 */ 1702 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 1703 1704 /* 1705 * Maximum interval for MMP checking in seconds. 1706 */ 1707 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 1708 1709 /* 1710 * Function prototypes 1711 */ 1712 1713 /* 1714 * Ok, these declarations are also in <linux/kernel.h> but none of the 1715 * ext4 source programs needs to include it so they are duplicated here. 1716 */ 1717 # define NORET_TYPE /**/ 1718 # define ATTRIB_NORET __attribute__((noreturn)) 1719 # define NORET_AND noreturn, 1720 1721 /* bitmap.c */ 1722 extern unsigned int ext4_count_free(struct buffer_head *, unsigned); 1723 1724 /* balloc.c */ 1725 extern unsigned int ext4_block_group(struct super_block *sb, 1726 ext4_fsblk_t blocknr); 1727 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 1728 ext4_fsblk_t blocknr); 1729 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 1730 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 1731 ext4_group_t group); 1732 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 1733 ext4_fsblk_t goal, 1734 unsigned int flags, 1735 unsigned long *count, 1736 int *errp); 1737 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, 1738 s64 nblocks, unsigned int flags); 1739 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *); 1740 extern void ext4_check_blocks_bitmap(struct super_block *); 1741 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 1742 ext4_group_t block_group, 1743 struct buffer_head ** bh); 1744 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1745 struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 1746 ext4_group_t block_group); 1747 extern unsigned ext4_init_block_bitmap(struct super_block *sb, 1748 struct buffer_head *bh, 1749 ext4_group_t group, 1750 struct ext4_group_desc *desc); 1751 #define ext4_free_blocks_after_init(sb, group, desc) \ 1752 ext4_init_block_bitmap(sb, NULL, group, desc) 1753 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 1754 1755 /* dir.c */ 1756 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 1757 struct file *, 1758 struct ext4_dir_entry_2 *, 1759 struct buffer_head *, unsigned int); 1760 #define ext4_check_dir_entry(dir, filp, de, bh, offset) \ 1761 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 1762 (de), (bh), (offset))) 1763 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 1764 __u32 minor_hash, 1765 struct ext4_dir_entry_2 *dirent); 1766 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 1767 1768 /* fsync.c */ 1769 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 1770 extern int ext4_flush_completed_IO(struct inode *); 1771 1772 /* hash.c */ 1773 extern int ext4fs_dirhash(const char *name, int len, struct 1774 dx_hash_info *hinfo); 1775 1776 /* ialloc.c */ 1777 extern struct inode *ext4_new_inode(handle_t *, struct inode *, int, 1778 const struct qstr *qstr, __u32 goal); 1779 extern void ext4_free_inode(handle_t *, struct inode *); 1780 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 1781 extern unsigned long ext4_count_free_inodes(struct super_block *); 1782 extern unsigned long ext4_count_dirs(struct super_block *); 1783 extern void ext4_check_inodes_bitmap(struct super_block *); 1784 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 1785 extern int ext4_init_inode_table(struct super_block *sb, 1786 ext4_group_t group, int barrier); 1787 1788 /* mballoc.c */ 1789 extern long ext4_mb_stats; 1790 extern long ext4_mb_max_to_scan; 1791 extern int ext4_mb_init(struct super_block *, int); 1792 extern int ext4_mb_release(struct super_block *); 1793 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 1794 struct ext4_allocation_request *, int *); 1795 extern int ext4_mb_reserve_blocks(struct super_block *, int); 1796 extern void ext4_discard_preallocations(struct inode *); 1797 extern int __init ext4_init_mballoc(void); 1798 extern void ext4_exit_mballoc(void); 1799 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 1800 struct buffer_head *bh, ext4_fsblk_t block, 1801 unsigned long count, int flags); 1802 extern int ext4_mb_add_groupinfo(struct super_block *sb, 1803 ext4_group_t i, struct ext4_group_desc *desc); 1804 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 1805 ext4_fsblk_t block, unsigned long count); 1806 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 1807 1808 /* inode.c */ 1809 struct buffer_head *ext4_getblk(handle_t *, struct inode *, 1810 ext4_lblk_t, int, int *); 1811 struct buffer_head *ext4_bread(handle_t *, struct inode *, 1812 ext4_lblk_t, int, int *); 1813 int ext4_get_block(struct inode *inode, sector_t iblock, 1814 struct buffer_head *bh_result, int create); 1815 1816 extern struct inode *ext4_iget(struct super_block *, unsigned long); 1817 extern int ext4_write_inode(struct inode *, struct writeback_control *); 1818 extern int ext4_setattr(struct dentry *, struct iattr *); 1819 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 1820 struct kstat *stat); 1821 extern void ext4_evict_inode(struct inode *); 1822 extern void ext4_clear_inode(struct inode *); 1823 extern int ext4_sync_inode(handle_t *, struct inode *); 1824 extern void ext4_dirty_inode(struct inode *, int); 1825 extern int ext4_change_inode_journal_flag(struct inode *, int); 1826 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 1827 extern int ext4_can_truncate(struct inode *inode); 1828 extern void ext4_truncate(struct inode *); 1829 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length); 1830 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 1831 extern void ext4_set_inode_flags(struct inode *); 1832 extern void ext4_get_inode_flags(struct ext4_inode_info *); 1833 extern int ext4_alloc_da_blocks(struct inode *inode); 1834 extern void ext4_set_aops(struct inode *inode); 1835 extern int ext4_writepage_trans_blocks(struct inode *); 1836 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 1837 extern int ext4_block_truncate_page(handle_t *handle, 1838 struct address_space *mapping, loff_t from); 1839 extern int ext4_block_zero_page_range(handle_t *handle, 1840 struct address_space *mapping, loff_t from, loff_t length); 1841 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 1842 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 1843 extern void ext4_da_update_reserve_space(struct inode *inode, 1844 int used, int quota_claim); 1845 1846 /* indirect.c */ 1847 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 1848 struct ext4_map_blocks *map, int flags); 1849 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb, 1850 const struct iovec *iov, loff_t offset, 1851 unsigned long nr_segs); 1852 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 1853 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk); 1854 extern void ext4_ind_truncate(struct inode *inode); 1855 1856 /* ioctl.c */ 1857 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 1858 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 1859 1860 /* migrate.c */ 1861 extern int ext4_ext_migrate(struct inode *); 1862 1863 /* namei.c */ 1864 extern int ext4_orphan_add(handle_t *, struct inode *); 1865 extern int ext4_orphan_del(handle_t *, struct inode *); 1866 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 1867 __u32 start_minor_hash, __u32 *next_hash); 1868 1869 /* resize.c */ 1870 extern int ext4_group_add(struct super_block *sb, 1871 struct ext4_new_group_data *input); 1872 extern int ext4_group_extend(struct super_block *sb, 1873 struct ext4_super_block *es, 1874 ext4_fsblk_t n_blocks_count); 1875 1876 /* super.c */ 1877 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 1878 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 1879 extern void ext4_kvfree(void *ptr); 1880 extern void __ext4_error(struct super_block *, const char *, unsigned int, 1881 const char *, ...) 1882 __attribute__ ((format (printf, 4, 5))); 1883 #define ext4_error(sb, message...) __ext4_error(sb, __func__, \ 1884 __LINE__, ## message) 1885 extern void ext4_error_inode(struct inode *, const char *, unsigned int, 1886 ext4_fsblk_t, const char *, ...) 1887 __attribute__ ((format (printf, 5, 6))); 1888 extern void ext4_error_file(struct file *, const char *, unsigned int, 1889 ext4_fsblk_t, const char *, ...) 1890 __attribute__ ((format (printf, 5, 6))); 1891 extern void __ext4_std_error(struct super_block *, const char *, 1892 unsigned int, int); 1893 extern void __ext4_abort(struct super_block *, const char *, unsigned int, 1894 const char *, ...) 1895 __attribute__ ((format (printf, 4, 5))); 1896 #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \ 1897 __LINE__, ## message) 1898 extern void __ext4_warning(struct super_block *, const char *, unsigned int, 1899 const char *, ...) 1900 __attribute__ ((format (printf, 4, 5))); 1901 #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \ 1902 __LINE__, ## message) 1903 extern void ext4_msg(struct super_block *, const char *, const char *, ...) 1904 __attribute__ ((format (printf, 3, 4))); 1905 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 1906 const char *, unsigned int, const char *); 1907 #define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \ 1908 __LINE__, msg) 1909 extern void __ext4_grp_locked_error(const char *, unsigned int, \ 1910 struct super_block *, ext4_group_t, \ 1911 unsigned long, ext4_fsblk_t, \ 1912 const char *, ...) 1913 __attribute__ ((format (printf, 7, 8))); 1914 #define ext4_grp_locked_error(sb, grp, message...) \ 1915 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message) 1916 extern void ext4_update_dynamic_rev(struct super_block *sb); 1917 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 1918 __u32 compat); 1919 extern int ext4_update_rocompat_feature(handle_t *handle, 1920 struct super_block *sb, __u32 rocompat); 1921 extern int ext4_update_incompat_feature(handle_t *handle, 1922 struct super_block *sb, __u32 incompat); 1923 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 1924 struct ext4_group_desc *bg); 1925 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 1926 struct ext4_group_desc *bg); 1927 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 1928 struct ext4_group_desc *bg); 1929 extern __u32 ext4_free_blks_count(struct super_block *sb, 1930 struct ext4_group_desc *bg); 1931 extern __u32 ext4_free_inodes_count(struct super_block *sb, 1932 struct ext4_group_desc *bg); 1933 extern __u32 ext4_used_dirs_count(struct super_block *sb, 1934 struct ext4_group_desc *bg); 1935 extern __u32 ext4_itable_unused_count(struct super_block *sb, 1936 struct ext4_group_desc *bg); 1937 extern void ext4_block_bitmap_set(struct super_block *sb, 1938 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1939 extern void ext4_inode_bitmap_set(struct super_block *sb, 1940 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1941 extern void ext4_inode_table_set(struct super_block *sb, 1942 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1943 extern void ext4_free_blks_set(struct super_block *sb, 1944 struct ext4_group_desc *bg, __u32 count); 1945 extern void ext4_free_inodes_set(struct super_block *sb, 1946 struct ext4_group_desc *bg, __u32 count); 1947 extern void ext4_used_dirs_set(struct super_block *sb, 1948 struct ext4_group_desc *bg, __u32 count); 1949 extern void ext4_itable_unused_set(struct super_block *sb, 1950 struct ext4_group_desc *bg, __u32 count); 1951 extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group, 1952 struct ext4_group_desc *gdp); 1953 extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group, 1954 struct ext4_group_desc *gdp); 1955 1956 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 1957 { 1958 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 1959 le32_to_cpu(es->s_blocks_count_lo); 1960 } 1961 1962 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 1963 { 1964 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 1965 le32_to_cpu(es->s_r_blocks_count_lo); 1966 } 1967 1968 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 1969 { 1970 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 1971 le32_to_cpu(es->s_free_blocks_count_lo); 1972 } 1973 1974 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 1975 ext4_fsblk_t blk) 1976 { 1977 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 1978 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 1979 } 1980 1981 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 1982 ext4_fsblk_t blk) 1983 { 1984 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 1985 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 1986 } 1987 1988 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 1989 ext4_fsblk_t blk) 1990 { 1991 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 1992 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 1993 } 1994 1995 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 1996 { 1997 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 1998 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 1999 le32_to_cpu(raw_inode->i_size_lo); 2000 else 2001 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2002 } 2003 2004 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2005 { 2006 raw_inode->i_size_lo = cpu_to_le32(i_size); 2007 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2008 } 2009 2010 static inline 2011 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2012 ext4_group_t group) 2013 { 2014 struct ext4_group_info ***grp_info; 2015 long indexv, indexh; 2016 grp_info = EXT4_SB(sb)->s_group_info; 2017 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2018 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2019 return grp_info[indexv][indexh]; 2020 } 2021 2022 /* 2023 * Reading s_groups_count requires using smp_rmb() afterwards. See 2024 * the locking protocol documented in the comments of ext4_group_add() 2025 * in resize.c 2026 */ 2027 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2028 { 2029 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2030 2031 smp_rmb(); 2032 return ngroups; 2033 } 2034 2035 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2036 ext4_group_t block_group) 2037 { 2038 return block_group >> sbi->s_log_groups_per_flex; 2039 } 2040 2041 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2042 { 2043 return 1 << sbi->s_log_groups_per_flex; 2044 } 2045 2046 #define ext4_std_error(sb, errno) \ 2047 do { \ 2048 if ((errno)) \ 2049 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2050 } while (0) 2051 2052 #ifdef CONFIG_SMP 2053 /* Each CPU can accumulate percpu_counter_batch blocks in their local 2054 * counters. So we need to make sure we have free blocks more 2055 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2056 */ 2057 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2058 #else 2059 #define EXT4_FREEBLOCKS_WATERMARK 0 2060 #endif 2061 2062 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2063 { 2064 /* 2065 * XXX: replace with spinlock if seen contended -bzzz 2066 */ 2067 down_write(&EXT4_I(inode)->i_data_sem); 2068 if (newsize > EXT4_I(inode)->i_disksize) 2069 EXT4_I(inode)->i_disksize = newsize; 2070 up_write(&EXT4_I(inode)->i_data_sem); 2071 return ; 2072 } 2073 2074 struct ext4_group_info { 2075 unsigned long bb_state; 2076 struct rb_root bb_free_root; 2077 ext4_grpblk_t bb_first_free; /* first free block */ 2078 ext4_grpblk_t bb_free; /* total free blocks */ 2079 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 2080 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 2081 struct list_head bb_prealloc_list; 2082 #ifdef DOUBLE_CHECK 2083 void *bb_bitmap; 2084 #endif 2085 struct rw_semaphore alloc_sem; 2086 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2087 * regions, index is order. 2088 * bb_counters[3] = 5 means 2089 * 5 free 8-block regions. */ 2090 }; 2091 2092 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 2093 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 2094 2095 #define EXT4_MB_GRP_NEED_INIT(grp) \ 2096 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 2097 2098 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 2099 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2100 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 2101 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2102 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 2103 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2104 2105 #define EXT4_MAX_CONTENTION 8 2106 #define EXT4_CONTENTION_THRESHOLD 2 2107 2108 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2109 ext4_group_t group) 2110 { 2111 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2112 } 2113 2114 /* 2115 * Returns true if the filesystem is busy enough that attempts to 2116 * access the block group locks has run into contention. 2117 */ 2118 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 2119 { 2120 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 2121 } 2122 2123 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 2124 { 2125 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 2126 if (spin_trylock(lock)) 2127 /* 2128 * We're able to grab the lock right away, so drop the 2129 * lock contention counter. 2130 */ 2131 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 2132 else { 2133 /* 2134 * The lock is busy, so bump the contention counter, 2135 * and then wait on the spin lock. 2136 */ 2137 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 2138 EXT4_MAX_CONTENTION); 2139 spin_lock(lock); 2140 } 2141 } 2142 2143 static inline void ext4_unlock_group(struct super_block *sb, 2144 ext4_group_t group) 2145 { 2146 spin_unlock(ext4_group_lock_ptr(sb, group)); 2147 } 2148 2149 static inline void ext4_mark_super_dirty(struct super_block *sb) 2150 { 2151 if (EXT4_SB(sb)->s_journal == NULL) 2152 sb->s_dirt =1; 2153 } 2154 2155 /* 2156 * Block validity checking 2157 */ 2158 #define ext4_check_indirect_blockref(inode, bh) \ 2159 ext4_check_blockref(__func__, __LINE__, inode, \ 2160 (__le32 *)(bh)->b_data, \ 2161 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 2162 2163 #define ext4_ind_check_inode(inode) \ 2164 ext4_check_blockref(__func__, __LINE__, inode, \ 2165 EXT4_I(inode)->i_data, \ 2166 EXT4_NDIR_BLOCKS) 2167 2168 /* 2169 * Inodes and files operations 2170 */ 2171 2172 /* dir.c */ 2173 extern const struct file_operations ext4_dir_operations; 2174 2175 /* file.c */ 2176 extern const struct inode_operations ext4_file_inode_operations; 2177 extern const struct file_operations ext4_file_operations; 2178 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 2179 2180 /* namei.c */ 2181 extern const struct inode_operations ext4_dir_inode_operations; 2182 extern const struct inode_operations ext4_special_inode_operations; 2183 extern struct dentry *ext4_get_parent(struct dentry *child); 2184 2185 /* symlink.c */ 2186 extern const struct inode_operations ext4_symlink_inode_operations; 2187 extern const struct inode_operations ext4_fast_symlink_inode_operations; 2188 2189 /* block_validity */ 2190 extern void ext4_release_system_zone(struct super_block *sb); 2191 extern int ext4_setup_system_zone(struct super_block *sb); 2192 extern int __init ext4_init_system_zone(void); 2193 extern void ext4_exit_system_zone(void); 2194 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 2195 ext4_fsblk_t start_blk, 2196 unsigned int count); 2197 extern int ext4_check_blockref(const char *, unsigned int, 2198 struct inode *, __le32 *, unsigned int); 2199 2200 /* extents.c */ 2201 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 2202 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 2203 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, 2204 int chunk); 2205 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 2206 struct ext4_map_blocks *map, int flags); 2207 extern void ext4_ext_truncate(struct inode *); 2208 extern int ext4_ext_punch_hole(struct file *file, loff_t offset, 2209 loff_t length); 2210 extern void ext4_ext_init(struct super_block *); 2211 extern void ext4_ext_release(struct super_block *); 2212 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 2213 loff_t len); 2214 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset, 2215 ssize_t len); 2216 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 2217 struct ext4_map_blocks *map, int flags); 2218 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2219 __u64 start, __u64 len); 2220 /* move_extent.c */ 2221 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 2222 __u64 start_orig, __u64 start_donor, 2223 __u64 len, __u64 *moved_len); 2224 2225 /* page-io.c */ 2226 extern int __init ext4_init_pageio(void); 2227 extern void ext4_exit_pageio(void); 2228 extern void ext4_ioend_wait(struct inode *); 2229 extern void ext4_free_io_end(ext4_io_end_t *io); 2230 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 2231 extern int ext4_end_io_nolock(ext4_io_end_t *io); 2232 extern void ext4_io_submit(struct ext4_io_submit *io); 2233 extern int ext4_bio_write_page(struct ext4_io_submit *io, 2234 struct page *page, 2235 int len, 2236 struct writeback_control *wbc); 2237 2238 /* mmp.c */ 2239 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 2240 2241 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */ 2242 enum ext4_state_bits { 2243 BH_Uninit /* blocks are allocated but uninitialized on disk */ 2244 = BH_JBDPrivateStart, 2245 }; 2246 2247 BUFFER_FNS(Uninit, uninit) 2248 TAS_BUFFER_FNS(Uninit, uninit) 2249 2250 /* 2251 * Add new method to test wether block and inode bitmaps are properly 2252 * initialized. With uninit_bg reading the block from disk is not enough 2253 * to mark the bitmap uptodate. We need to also zero-out the bitmap 2254 */ 2255 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 2256 2257 static inline int bitmap_uptodate(struct buffer_head *bh) 2258 { 2259 return (buffer_uptodate(bh) && 2260 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 2261 } 2262 static inline void set_bitmap_uptodate(struct buffer_head *bh) 2263 { 2264 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 2265 } 2266 2267 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 2268 2269 /* For ioend & aio unwritten conversion wait queues */ 2270 #define EXT4_WQ_HASH_SZ 37 2271 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 2272 EXT4_WQ_HASH_SZ]) 2273 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\ 2274 EXT4_WQ_HASH_SZ]) 2275 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 2276 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; 2277 2278 #define EXT4_RESIZING 0 2279 extern int ext4_resize_begin(struct super_block *sb); 2280 extern void ext4_resize_end(struct super_block *sb); 2281 2282 #endif /* __KERNEL__ */ 2283 2284 #endif /* _EXT4_H */ 2285