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(__func__, (inode), (fmt), ## a) 61 62 #define EXT4_ERROR_FILE(file, fmt, a...) \ 63 ext4_error_file(__func__, (file), (fmt), ## a) 64 65 /* data type for block offset of block group */ 66 typedef int ext4_grpblk_t; 67 68 /* data type for filesystem-wide blocks number */ 69 typedef unsigned long long ext4_fsblk_t; 70 71 /* data type for file logical block number */ 72 typedef __u32 ext4_lblk_t; 73 74 /* data type for block group number */ 75 typedef unsigned int ext4_group_t; 76 77 /* 78 * Flags used in mballoc's allocation_context flags field. 79 * 80 * Also used to show what's going on for debugging purposes when the 81 * flag field is exported via the traceport interface 82 */ 83 84 /* prefer goal again. length */ 85 #define EXT4_MB_HINT_MERGE 0x0001 86 /* blocks already reserved */ 87 #define EXT4_MB_HINT_RESERVED 0x0002 88 /* metadata is being allocated */ 89 #define EXT4_MB_HINT_METADATA 0x0004 90 /* first blocks in the file */ 91 #define EXT4_MB_HINT_FIRST 0x0008 92 /* search for the best chunk */ 93 #define EXT4_MB_HINT_BEST 0x0010 94 /* data is being allocated */ 95 #define EXT4_MB_HINT_DATA 0x0020 96 /* don't preallocate (for tails) */ 97 #define EXT4_MB_HINT_NOPREALLOC 0x0040 98 /* allocate for locality group */ 99 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 100 /* allocate goal blocks or none */ 101 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 102 /* goal is meaningful */ 103 #define EXT4_MB_HINT_TRY_GOAL 0x0200 104 /* blocks already pre-reserved by delayed allocation */ 105 #define EXT4_MB_DELALLOC_RESERVED 0x0400 106 /* We are doing stream allocation */ 107 #define EXT4_MB_STREAM_ALLOC 0x0800 108 109 110 struct ext4_allocation_request { 111 /* target inode for block we're allocating */ 112 struct inode *inode; 113 /* how many blocks we want to allocate */ 114 unsigned int len; 115 /* logical block in target inode */ 116 ext4_lblk_t logical; 117 /* the closest logical allocated block to the left */ 118 ext4_lblk_t lleft; 119 /* the closest logical allocated block to the right */ 120 ext4_lblk_t lright; 121 /* phys. target (a hint) */ 122 ext4_fsblk_t goal; 123 /* phys. block for the closest logical allocated block to the left */ 124 ext4_fsblk_t pleft; 125 /* phys. block for the closest logical allocated block to the right */ 126 ext4_fsblk_t pright; 127 /* flags. see above EXT4_MB_HINT_* */ 128 unsigned int flags; 129 }; 130 131 /* 132 * Logical to physical block mapping, used by ext4_map_blocks() 133 * 134 * This structure is used to pass requests into ext4_map_blocks() as 135 * well as to store the information returned by ext4_map_blocks(). It 136 * takes less room on the stack than a struct buffer_head. 137 */ 138 #define EXT4_MAP_NEW (1 << BH_New) 139 #define EXT4_MAP_MAPPED (1 << BH_Mapped) 140 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 141 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 142 #define EXT4_MAP_UNINIT (1 << BH_Uninit) 143 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 144 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\ 145 EXT4_MAP_UNINIT) 146 147 struct ext4_map_blocks { 148 ext4_fsblk_t m_pblk; 149 ext4_lblk_t m_lblk; 150 unsigned int m_len; 151 unsigned int m_flags; 152 }; 153 154 /* 155 * For delayed allocation tracking 156 */ 157 struct mpage_da_data { 158 struct inode *inode; 159 sector_t b_blocknr; /* start block number of extent */ 160 size_t b_size; /* size of extent */ 161 unsigned long b_state; /* state of the extent */ 162 unsigned long first_page, next_page; /* extent of pages */ 163 struct writeback_control *wbc; 164 int io_done; 165 int pages_written; 166 int retval; 167 }; 168 #define EXT4_IO_UNWRITTEN 0x1 169 typedef struct ext4_io_end { 170 struct list_head list; /* per-file finished AIO list */ 171 struct inode *inode; /* file being written to */ 172 unsigned int flag; /* unwritten or not */ 173 struct page *page; /* page struct for buffer write */ 174 loff_t offset; /* offset in the file */ 175 ssize_t size; /* size of the extent */ 176 struct work_struct work; /* data work queue */ 177 } ext4_io_end_t; 178 179 /* 180 * Special inodes numbers 181 */ 182 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 183 #define EXT4_ROOT_INO 2 /* Root inode */ 184 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 185 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 186 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 187 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 188 189 /* First non-reserved inode for old ext4 filesystems */ 190 #define EXT4_GOOD_OLD_FIRST_INO 11 191 192 /* 193 * Maximal count of links to a file 194 */ 195 #define EXT4_LINK_MAX 65000 196 197 /* 198 * Macro-instructions used to manage several block sizes 199 */ 200 #define EXT4_MIN_BLOCK_SIZE 1024 201 #define EXT4_MAX_BLOCK_SIZE 65536 202 #define EXT4_MIN_BLOCK_LOG_SIZE 10 203 #ifdef __KERNEL__ 204 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 205 #else 206 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 207 #endif 208 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 209 #ifdef __KERNEL__ 210 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 211 #else 212 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 213 #endif 214 #ifdef __KERNEL__ 215 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 216 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 217 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 218 #else 219 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 220 EXT4_GOOD_OLD_INODE_SIZE : \ 221 (s)->s_inode_size) 222 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 223 EXT4_GOOD_OLD_FIRST_INO : \ 224 (s)->s_first_ino) 225 #endif 226 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 227 228 /* 229 * Structure of a blocks group descriptor 230 */ 231 struct ext4_group_desc 232 { 233 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 234 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 235 __le32 bg_inode_table_lo; /* Inodes table block */ 236 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 237 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 238 __le16 bg_used_dirs_count_lo; /* Directories count */ 239 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 240 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ 241 __le16 bg_itable_unused_lo; /* Unused inodes count */ 242 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 243 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 244 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 245 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 246 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 247 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 248 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 249 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 250 __u32 bg_reserved2[3]; 251 }; 252 253 /* 254 * Structure of a flex block group info 255 */ 256 257 struct flex_groups { 258 atomic_t free_inodes; 259 atomic_t free_blocks; 260 atomic_t used_dirs; 261 }; 262 263 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 264 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 265 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 266 267 /* 268 * Macro-instructions used to manage group descriptors 269 */ 270 #define EXT4_MIN_DESC_SIZE 32 271 #define EXT4_MIN_DESC_SIZE_64BIT 64 272 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 273 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 274 #ifdef __KERNEL__ 275 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 276 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 277 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 278 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 279 #else 280 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 281 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 282 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 283 #endif 284 285 /* 286 * Constants relative to the data blocks 287 */ 288 #define EXT4_NDIR_BLOCKS 12 289 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 290 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 291 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 292 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 293 294 /* 295 * Inode flags 296 */ 297 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 298 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 299 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 300 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 301 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 302 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 303 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 304 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 305 /* Reserved for compression usage... */ 306 #define EXT4_DIRTY_FL 0x00000100 307 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 308 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 309 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 310 /* End compression flags --- maybe not all used */ 311 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 312 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 313 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 314 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 315 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 316 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 317 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 318 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 319 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 320 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 321 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 322 323 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 324 #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ 325 326 /* Flags that should be inherited by new inodes from their parent. */ 327 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 328 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\ 329 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 330 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 331 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 332 333 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 334 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 335 336 /* Flags that are appropriate for non-directories/regular files. */ 337 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 338 339 /* Mask out flags that are inappropriate for the given type of inode. */ 340 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 341 { 342 if (S_ISDIR(mode)) 343 return flags; 344 else if (S_ISREG(mode)) 345 return flags & EXT4_REG_FLMASK; 346 else 347 return flags & EXT4_OTHER_FLMASK; 348 } 349 350 /* 351 * Inode flags used for atomic set/get 352 */ 353 enum { 354 EXT4_INODE_SECRM = 0, /* Secure deletion */ 355 EXT4_INODE_UNRM = 1, /* Undelete */ 356 EXT4_INODE_COMPR = 2, /* Compress file */ 357 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 358 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 359 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 360 EXT4_INODE_NODUMP = 6, /* do not dump file */ 361 EXT4_INODE_NOATIME = 7, /* do not update atime */ 362 /* Reserved for compression usage... */ 363 EXT4_INODE_DIRTY = 8, 364 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 365 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 366 EXT4_INODE_ECOMPR = 11, /* Compression error */ 367 /* End compression flags --- maybe not all used */ 368 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 369 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 370 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 371 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 372 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 373 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 374 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 375 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 376 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 377 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 378 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 379 }; 380 381 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 382 #define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \ 383 printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \ 384 EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); } 385 386 /* 387 * Since it's pretty easy to mix up bit numbers and hex values, and we 388 * can't do a compile-time test for ENUM values, we use a run-time 389 * test to make sure that EXT4_XXX_FL is consistent with respect to 390 * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop 391 * out so it won't cost any extra space in the compiled kernel image. 392 * But it's important that these values are the same, since we are 393 * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL 394 * must be consistent with the values of FS_XXX_FL defined in 395 * include/linux/fs.h and the on-disk values found in ext2, ext3, and 396 * ext4 filesystems, and of course the values defined in e2fsprogs. 397 * 398 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 399 */ 400 static inline void ext4_check_flag_values(void) 401 { 402 CHECK_FLAG_VALUE(SECRM); 403 CHECK_FLAG_VALUE(UNRM); 404 CHECK_FLAG_VALUE(COMPR); 405 CHECK_FLAG_VALUE(SYNC); 406 CHECK_FLAG_VALUE(IMMUTABLE); 407 CHECK_FLAG_VALUE(APPEND); 408 CHECK_FLAG_VALUE(NODUMP); 409 CHECK_FLAG_VALUE(NOATIME); 410 CHECK_FLAG_VALUE(DIRTY); 411 CHECK_FLAG_VALUE(COMPRBLK); 412 CHECK_FLAG_VALUE(NOCOMPR); 413 CHECK_FLAG_VALUE(ECOMPR); 414 CHECK_FLAG_VALUE(INDEX); 415 CHECK_FLAG_VALUE(IMAGIC); 416 CHECK_FLAG_VALUE(JOURNAL_DATA); 417 CHECK_FLAG_VALUE(NOTAIL); 418 CHECK_FLAG_VALUE(DIRSYNC); 419 CHECK_FLAG_VALUE(TOPDIR); 420 CHECK_FLAG_VALUE(HUGE_FILE); 421 CHECK_FLAG_VALUE(EXTENTS); 422 CHECK_FLAG_VALUE(EA_INODE); 423 CHECK_FLAG_VALUE(EOFBLOCKS); 424 CHECK_FLAG_VALUE(RESERVED); 425 } 426 427 /* Used to pass group descriptor data when online resize is done */ 428 struct ext4_new_group_input { 429 __u32 group; /* Group number for this data */ 430 __u64 block_bitmap; /* Absolute block number of block bitmap */ 431 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 432 __u64 inode_table; /* Absolute block number of inode table start */ 433 __u32 blocks_count; /* Total number of blocks in this group */ 434 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 435 __u16 unused; 436 }; 437 438 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 439 struct compat_ext4_new_group_input { 440 u32 group; 441 compat_u64 block_bitmap; 442 compat_u64 inode_bitmap; 443 compat_u64 inode_table; 444 u32 blocks_count; 445 u16 reserved_blocks; 446 u16 unused; 447 }; 448 #endif 449 450 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 451 struct ext4_new_group_data { 452 __u32 group; 453 __u64 block_bitmap; 454 __u64 inode_bitmap; 455 __u64 inode_table; 456 __u32 blocks_count; 457 __u16 reserved_blocks; 458 __u16 unused; 459 __u32 free_blocks_count; 460 }; 461 462 /* 463 * Flags used by ext4_get_blocks() 464 */ 465 /* Allocate any needed blocks and/or convert an unitialized 466 extent to be an initialized ext4 */ 467 #define EXT4_GET_BLOCKS_CREATE 0x0001 468 /* Request the creation of an unitialized extent */ 469 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 470 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ 471 EXT4_GET_BLOCKS_CREATE) 472 /* Caller is from the delayed allocation writeout path, 473 so set the magic i_delalloc_reserve_flag after taking the 474 inode allocation semaphore for */ 475 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 476 /* caller is from the direct IO path, request to creation of an 477 unitialized extents if not allocated, split the uninitialized 478 extent if blocks has been preallocated already*/ 479 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 480 #define EXT4_GET_BLOCKS_CONVERT 0x0010 481 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 482 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 483 /* Convert extent to initialized after IO complete */ 484 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 485 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 486 487 /* 488 * Flags used by ext4_free_blocks 489 */ 490 #define EXT4_FREE_BLOCKS_METADATA 0x0001 491 #define EXT4_FREE_BLOCKS_FORGET 0x0002 492 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 493 494 /* 495 * ioctl commands 496 */ 497 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 498 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 499 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 500 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 501 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 502 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 503 #ifdef CONFIG_JBD2_DEBUG 504 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long) 505 #endif 506 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 507 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 508 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 509 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 510 #define EXT4_IOC_MIGRATE _IO('f', 9) 511 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 512 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 513 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 514 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 515 516 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 517 /* 518 * ioctl commands in 32 bit emulation 519 */ 520 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 521 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 522 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 523 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 524 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 525 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 526 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 527 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 528 #ifdef CONFIG_JBD2_DEBUG 529 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int) 530 #endif 531 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 532 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 533 #endif 534 535 536 /* 537 * Mount options 538 */ 539 struct ext4_mount_options { 540 unsigned long s_mount_opt; 541 uid_t s_resuid; 542 gid_t s_resgid; 543 unsigned long s_commit_interval; 544 u32 s_min_batch_time, s_max_batch_time; 545 #ifdef CONFIG_QUOTA 546 int s_jquota_fmt; 547 char *s_qf_names[MAXQUOTAS]; 548 #endif 549 }; 550 551 /* Max physical block we can addres w/o extents */ 552 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 553 554 /* 555 * Structure of an inode on the disk 556 */ 557 struct ext4_inode { 558 __le16 i_mode; /* File mode */ 559 __le16 i_uid; /* Low 16 bits of Owner Uid */ 560 __le32 i_size_lo; /* Size in bytes */ 561 __le32 i_atime; /* Access time */ 562 __le32 i_ctime; /* Inode Change time */ 563 __le32 i_mtime; /* Modification time */ 564 __le32 i_dtime; /* Deletion Time */ 565 __le16 i_gid; /* Low 16 bits of Group Id */ 566 __le16 i_links_count; /* Links count */ 567 __le32 i_blocks_lo; /* Blocks count */ 568 __le32 i_flags; /* File flags */ 569 union { 570 struct { 571 __le32 l_i_version; 572 } linux1; 573 struct { 574 __u32 h_i_translator; 575 } hurd1; 576 struct { 577 __u32 m_i_reserved1; 578 } masix1; 579 } osd1; /* OS dependent 1 */ 580 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 581 __le32 i_generation; /* File version (for NFS) */ 582 __le32 i_file_acl_lo; /* File ACL */ 583 __le32 i_size_high; 584 __le32 i_obso_faddr; /* Obsoleted fragment address */ 585 union { 586 struct { 587 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 588 __le16 l_i_file_acl_high; 589 __le16 l_i_uid_high; /* these 2 fields */ 590 __le16 l_i_gid_high; /* were reserved2[0] */ 591 __u32 l_i_reserved2; 592 } linux2; 593 struct { 594 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 595 __u16 h_i_mode_high; 596 __u16 h_i_uid_high; 597 __u16 h_i_gid_high; 598 __u32 h_i_author; 599 } hurd2; 600 struct { 601 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 602 __le16 m_i_file_acl_high; 603 __u32 m_i_reserved2[2]; 604 } masix2; 605 } osd2; /* OS dependent 2 */ 606 __le16 i_extra_isize; 607 __le16 i_pad1; 608 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 609 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 610 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 611 __le32 i_crtime; /* File Creation time */ 612 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 613 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 614 }; 615 616 struct move_extent { 617 __u32 reserved; /* should be zero */ 618 __u32 donor_fd; /* donor file descriptor */ 619 __u64 orig_start; /* logical start offset in block for orig */ 620 __u64 donor_start; /* logical start offset in block for donor */ 621 __u64 len; /* block length to be moved */ 622 __u64 moved_len; /* moved block length */ 623 }; 624 625 #define EXT4_EPOCH_BITS 2 626 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 627 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 628 629 /* 630 * Extended fields will fit into an inode if the filesystem was formatted 631 * with large inodes (-I 256 or larger) and there are not currently any EAs 632 * consuming all of the available space. For new inodes we always reserve 633 * enough space for the kernel's known extended fields, but for inodes 634 * created with an old kernel this might not have been the case. None of 635 * the extended inode fields is critical for correct filesystem operation. 636 * This macro checks if a certain field fits in the inode. Note that 637 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 638 */ 639 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 640 ((offsetof(typeof(*ext4_inode), field) + \ 641 sizeof((ext4_inode)->field)) \ 642 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 643 (einode)->i_extra_isize)) \ 644 645 static inline __le32 ext4_encode_extra_time(struct timespec *time) 646 { 647 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 648 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | 649 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); 650 } 651 652 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 653 { 654 if (sizeof(time->tv_sec) > 4) 655 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 656 << 32; 657 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 658 } 659 660 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 661 do { \ 662 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 663 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 664 (raw_inode)->xtime ## _extra = \ 665 ext4_encode_extra_time(&(inode)->xtime); \ 666 } while (0) 667 668 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 669 do { \ 670 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 671 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 672 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 673 (raw_inode)->xtime ## _extra = \ 674 ext4_encode_extra_time(&(einode)->xtime); \ 675 } while (0) 676 677 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 678 do { \ 679 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 680 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 681 ext4_decode_extra_time(&(inode)->xtime, \ 682 raw_inode->xtime ## _extra); \ 683 } while (0) 684 685 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 686 do { \ 687 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 688 (einode)->xtime.tv_sec = \ 689 (signed)le32_to_cpu((raw_inode)->xtime); \ 690 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 691 ext4_decode_extra_time(&(einode)->xtime, \ 692 raw_inode->xtime ## _extra); \ 693 } while (0) 694 695 #define i_disk_version osd1.linux1.l_i_version 696 697 #if defined(__KERNEL__) || defined(__linux__) 698 #define i_reserved1 osd1.linux1.l_i_reserved1 699 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 700 #define i_blocks_high osd2.linux2.l_i_blocks_high 701 #define i_uid_low i_uid 702 #define i_gid_low i_gid 703 #define i_uid_high osd2.linux2.l_i_uid_high 704 #define i_gid_high osd2.linux2.l_i_gid_high 705 #define i_reserved2 osd2.linux2.l_i_reserved2 706 707 #elif defined(__GNU__) 708 709 #define i_translator osd1.hurd1.h_i_translator 710 #define i_uid_high osd2.hurd2.h_i_uid_high 711 #define i_gid_high osd2.hurd2.h_i_gid_high 712 #define i_author osd2.hurd2.h_i_author 713 714 #elif defined(__masix__) 715 716 #define i_reserved1 osd1.masix1.m_i_reserved1 717 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 718 #define i_reserved2 osd2.masix2.m_i_reserved2 719 720 #endif /* defined(__KERNEL__) || defined(__linux__) */ 721 722 /* 723 * storage for cached extent 724 */ 725 struct ext4_ext_cache { 726 ext4_fsblk_t ec_start; 727 ext4_lblk_t ec_block; 728 __u32 ec_len; /* must be 32bit to return holes */ 729 __u32 ec_type; 730 }; 731 732 /* 733 * fourth extended file system inode data in memory 734 */ 735 struct ext4_inode_info { 736 __le32 i_data[15]; /* unconverted */ 737 __u32 i_dtime; 738 ext4_fsblk_t i_file_acl; 739 740 /* 741 * i_block_group is the number of the block group which contains 742 * this file's inode. Constant across the lifetime of the inode, 743 * it is ued for making block allocation decisions - we try to 744 * place a file's data blocks near its inode block, and new inodes 745 * near to their parent directory's inode. 746 */ 747 ext4_group_t i_block_group; 748 unsigned long i_state_flags; /* Dynamic state flags */ 749 unsigned long i_flags; 750 751 ext4_lblk_t i_dir_start_lookup; 752 #ifdef CONFIG_EXT4_FS_XATTR 753 /* 754 * Extended attributes can be read independently of the main file 755 * data. Taking i_mutex even when reading would cause contention 756 * between readers of EAs and writers of regular file data, so 757 * instead we synchronize on xattr_sem when reading or changing 758 * EAs. 759 */ 760 struct rw_semaphore xattr_sem; 761 #endif 762 763 struct list_head i_orphan; /* unlinked but open inodes */ 764 765 /* 766 * i_disksize keeps track of what the inode size is ON DISK, not 767 * in memory. During truncate, i_size is set to the new size by 768 * the VFS prior to calling ext4_truncate(), but the filesystem won't 769 * set i_disksize to 0 until the truncate is actually under way. 770 * 771 * The intent is that i_disksize always represents the blocks which 772 * are used by this file. This allows recovery to restart truncate 773 * on orphans if we crash during truncate. We actually write i_disksize 774 * into the on-disk inode when writing inodes out, instead of i_size. 775 * 776 * The only time when i_disksize and i_size may be different is when 777 * a truncate is in progress. The only things which change i_disksize 778 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 779 */ 780 loff_t i_disksize; 781 782 /* 783 * i_data_sem is for serialising ext4_truncate() against 784 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 785 * data tree are chopped off during truncate. We can't do that in 786 * ext4 because whenever we perform intermediate commits during 787 * truncate, the inode and all the metadata blocks *must* be in a 788 * consistent state which allows truncation of the orphans to restart 789 * during recovery. Hence we must fix the get_block-vs-truncate race 790 * by other means, so we have i_data_sem. 791 */ 792 struct rw_semaphore i_data_sem; 793 struct inode vfs_inode; 794 struct jbd2_inode jinode; 795 796 struct ext4_ext_cache i_cached_extent; 797 /* 798 * File creation time. Its function is same as that of 799 * struct timespec i_{a,c,m}time in the generic inode. 800 */ 801 struct timespec i_crtime; 802 803 /* mballoc */ 804 struct list_head i_prealloc_list; 805 spinlock_t i_prealloc_lock; 806 807 /* ialloc */ 808 ext4_group_t i_last_alloc_group; 809 810 /* allocation reservation info for delalloc */ 811 unsigned int i_reserved_data_blocks; 812 unsigned int i_reserved_meta_blocks; 813 unsigned int i_allocated_meta_blocks; 814 unsigned short i_delalloc_reserved_flag; 815 sector_t i_da_metadata_calc_last_lblock; 816 int i_da_metadata_calc_len; 817 818 /* on-disk additional length */ 819 __u16 i_extra_isize; 820 821 spinlock_t i_block_reservation_lock; 822 #ifdef CONFIG_QUOTA 823 /* quota space reservation, managed internally by quota code */ 824 qsize_t i_reserved_quota; 825 #endif 826 827 /* completed IOs that might need unwritten extents handling */ 828 struct list_head i_completed_io_list; 829 spinlock_t i_completed_io_lock; 830 /* current io_end structure for async DIO write*/ 831 ext4_io_end_t *cur_aio_dio; 832 833 /* 834 * Transactions that contain inode's metadata needed to complete 835 * fsync and fdatasync, respectively. 836 */ 837 tid_t i_sync_tid; 838 tid_t i_datasync_tid; 839 }; 840 841 /* 842 * File system states 843 */ 844 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 845 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 846 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 847 848 /* 849 * Misc. filesystem flags 850 */ 851 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 852 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 853 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 854 855 /* 856 * Mount flags 857 */ 858 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */ 859 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 860 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 861 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 862 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 863 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 864 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 865 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 866 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 867 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 868 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 869 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 870 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 871 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 872 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 873 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 874 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 875 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 876 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */ 877 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 878 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 879 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 880 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 881 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 882 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 883 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */ 884 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 885 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 886 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 887 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 888 889 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt 890 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt 891 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 892 EXT4_MOUNT_##opt) 893 894 #define ext4_set_bit ext2_set_bit 895 #define ext4_set_bit_atomic ext2_set_bit_atomic 896 #define ext4_clear_bit ext2_clear_bit 897 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 898 #define ext4_test_bit ext2_test_bit 899 #define ext4_find_first_zero_bit ext2_find_first_zero_bit 900 #define ext4_find_next_zero_bit ext2_find_next_zero_bit 901 #define ext4_find_next_bit ext2_find_next_bit 902 903 /* 904 * Maximal mount counts between two filesystem checks 905 */ 906 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 907 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 908 909 /* 910 * Behaviour when detecting errors 911 */ 912 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 913 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 914 #define EXT4_ERRORS_PANIC 3 /* Panic */ 915 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 916 917 /* 918 * Structure of the super block 919 */ 920 struct ext4_super_block { 921 /*00*/ __le32 s_inodes_count; /* Inodes count */ 922 __le32 s_blocks_count_lo; /* Blocks count */ 923 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 924 __le32 s_free_blocks_count_lo; /* Free blocks count */ 925 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 926 __le32 s_first_data_block; /* First Data Block */ 927 __le32 s_log_block_size; /* Block size */ 928 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */ 929 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 930 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */ 931 __le32 s_inodes_per_group; /* # Inodes per group */ 932 __le32 s_mtime; /* Mount time */ 933 /*30*/ __le32 s_wtime; /* Write time */ 934 __le16 s_mnt_count; /* Mount count */ 935 __le16 s_max_mnt_count; /* Maximal mount count */ 936 __le16 s_magic; /* Magic signature */ 937 __le16 s_state; /* File system state */ 938 __le16 s_errors; /* Behaviour when detecting errors */ 939 __le16 s_minor_rev_level; /* minor revision level */ 940 /*40*/ __le32 s_lastcheck; /* time of last check */ 941 __le32 s_checkinterval; /* max. time between checks */ 942 __le32 s_creator_os; /* OS */ 943 __le32 s_rev_level; /* Revision level */ 944 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 945 __le16 s_def_resgid; /* Default gid for reserved blocks */ 946 /* 947 * These fields are for EXT4_DYNAMIC_REV superblocks only. 948 * 949 * Note: the difference between the compatible feature set and 950 * the incompatible feature set is that if there is a bit set 951 * in the incompatible feature set that the kernel doesn't 952 * know about, it should refuse to mount the filesystem. 953 * 954 * e2fsck's requirements are more strict; if it doesn't know 955 * about a feature in either the compatible or incompatible 956 * feature set, it must abort and not try to meddle with 957 * things it doesn't understand... 958 */ 959 __le32 s_first_ino; /* First non-reserved inode */ 960 __le16 s_inode_size; /* size of inode structure */ 961 __le16 s_block_group_nr; /* block group # of this superblock */ 962 __le32 s_feature_compat; /* compatible feature set */ 963 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 964 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 965 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 966 /*78*/ char s_volume_name[16]; /* volume name */ 967 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 968 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 969 /* 970 * Performance hints. Directory preallocation should only 971 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 972 */ 973 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 974 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 975 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 976 /* 977 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 978 */ 979 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 980 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 981 __le32 s_journal_dev; /* device number of journal file */ 982 __le32 s_last_orphan; /* start of list of inodes to delete */ 983 __le32 s_hash_seed[4]; /* HTREE hash seed */ 984 __u8 s_def_hash_version; /* Default hash version to use */ 985 __u8 s_reserved_char_pad; 986 __le16 s_desc_size; /* size of group descriptor */ 987 /*100*/ __le32 s_default_mount_opts; 988 __le32 s_first_meta_bg; /* First metablock block group */ 989 __le32 s_mkfs_time; /* When the filesystem was created */ 990 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 991 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 992 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 993 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 994 __le32 s_free_blocks_count_hi; /* Free blocks count */ 995 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 996 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 997 __le32 s_flags; /* Miscellaneous flags */ 998 __le16 s_raid_stride; /* RAID stride */ 999 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */ 1000 __le64 s_mmp_block; /* Block for multi-mount protection */ 1001 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1002 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1003 __u8 s_reserved_char_pad2; 1004 __le16 s_reserved_pad; 1005 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1006 __u32 s_reserved[160]; /* Padding to the end of the block */ 1007 }; 1008 1009 #ifdef __KERNEL__ 1010 1011 /* 1012 * run-time mount flags 1013 */ 1014 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1015 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1016 1017 /* 1018 * fourth extended-fs super-block data in memory 1019 */ 1020 struct ext4_sb_info { 1021 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1022 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1023 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1024 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1025 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1026 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1027 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1028 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1029 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1030 unsigned long s_overhead_last; /* Last calculated overhead */ 1031 unsigned long s_blocks_last; /* Last seen block count */ 1032 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1033 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1034 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1035 struct buffer_head **s_group_desc; 1036 unsigned int s_mount_opt; 1037 unsigned int s_mount_flags; 1038 ext4_fsblk_t s_sb_block; 1039 uid_t s_resuid; 1040 gid_t s_resgid; 1041 unsigned short s_mount_state; 1042 unsigned short s_pad; 1043 int s_addr_per_block_bits; 1044 int s_desc_per_block_bits; 1045 int s_inode_size; 1046 int s_first_ino; 1047 unsigned int s_inode_readahead_blks; 1048 unsigned int s_inode_goal; 1049 spinlock_t s_next_gen_lock; 1050 u32 s_next_generation; 1051 u32 s_hash_seed[4]; 1052 int s_def_hash_version; 1053 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1054 struct percpu_counter s_freeblocks_counter; 1055 struct percpu_counter s_freeinodes_counter; 1056 struct percpu_counter s_dirs_counter; 1057 struct percpu_counter s_dirtyblocks_counter; 1058 struct blockgroup_lock *s_blockgroup_lock; 1059 struct proc_dir_entry *s_proc; 1060 struct kobject s_kobj; 1061 struct completion s_kobj_unregister; 1062 1063 /* Journaling */ 1064 struct inode *s_journal_inode; 1065 struct journal_s *s_journal; 1066 struct list_head s_orphan; 1067 struct mutex s_orphan_lock; 1068 struct mutex s_resize_lock; 1069 unsigned long s_commit_interval; 1070 u32 s_max_batch_time; 1071 u32 s_min_batch_time; 1072 struct block_device *journal_bdev; 1073 #ifdef CONFIG_JBD2_DEBUG 1074 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */ 1075 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */ 1076 #endif 1077 #ifdef CONFIG_QUOTA 1078 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ 1079 int s_jquota_fmt; /* Format of quota to use */ 1080 #endif 1081 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1082 struct rb_root system_blks; 1083 1084 #ifdef EXTENTS_STATS 1085 /* ext4 extents stats */ 1086 unsigned long s_ext_min; 1087 unsigned long s_ext_max; 1088 unsigned long s_depth_max; 1089 spinlock_t s_ext_stats_lock; 1090 unsigned long s_ext_blocks; 1091 unsigned long s_ext_extents; 1092 #endif 1093 1094 /* for buddy allocator */ 1095 struct ext4_group_info ***s_group_info; 1096 struct inode *s_buddy_cache; 1097 long s_blocks_reserved; 1098 spinlock_t s_reserve_lock; 1099 spinlock_t s_md_lock; 1100 tid_t s_last_transaction; 1101 unsigned short *s_mb_offsets; 1102 unsigned int *s_mb_maxs; 1103 1104 /* tunables */ 1105 unsigned long s_stripe; 1106 unsigned int s_mb_stream_request; 1107 unsigned int s_mb_max_to_scan; 1108 unsigned int s_mb_min_to_scan; 1109 unsigned int s_mb_stats; 1110 unsigned int s_mb_order2_reqs; 1111 unsigned int s_mb_group_prealloc; 1112 unsigned int s_max_writeback_mb_bump; 1113 /* where last allocation was done - for stream allocation */ 1114 unsigned long s_mb_last_group; 1115 unsigned long s_mb_last_start; 1116 1117 /* stats for buddy allocator */ 1118 spinlock_t s_mb_pa_lock; 1119 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1120 atomic_t s_bal_success; /* we found long enough chunks */ 1121 atomic_t s_bal_allocated; /* in blocks */ 1122 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1123 atomic_t s_bal_goals; /* goal hits */ 1124 atomic_t s_bal_breaks; /* too long searches */ 1125 atomic_t s_bal_2orders; /* 2^order hits */ 1126 spinlock_t s_bal_lock; 1127 unsigned long s_mb_buddies_generated; 1128 unsigned long long s_mb_generation_time; 1129 atomic_t s_mb_lost_chunks; 1130 atomic_t s_mb_preallocated; 1131 atomic_t s_mb_discarded; 1132 atomic_t s_lock_busy; 1133 1134 /* locality groups */ 1135 struct ext4_locality_group __percpu *s_locality_groups; 1136 1137 /* for write statistics */ 1138 unsigned long s_sectors_written_start; 1139 u64 s_kbytes_written; 1140 1141 unsigned int s_log_groups_per_flex; 1142 struct flex_groups *s_flex_groups; 1143 1144 /* workqueue for dio unwritten */ 1145 struct workqueue_struct *dio_unwritten_wq; 1146 }; 1147 1148 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1149 { 1150 return sb->s_fs_info; 1151 } 1152 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1153 { 1154 return container_of(inode, struct ext4_inode_info, vfs_inode); 1155 } 1156 1157 static inline struct timespec ext4_current_time(struct inode *inode) 1158 { 1159 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1160 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1161 } 1162 1163 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1164 { 1165 return ino == EXT4_ROOT_INO || 1166 ino == EXT4_JOURNAL_INO || 1167 ino == EXT4_RESIZE_INO || 1168 (ino >= EXT4_FIRST_INO(sb) && 1169 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1170 } 1171 1172 /* 1173 * Inode dynamic state flags 1174 */ 1175 enum { 1176 EXT4_STATE_JDATA, /* journaled data exists */ 1177 EXT4_STATE_NEW, /* inode is newly created */ 1178 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1179 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1180 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1181 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1182 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1183 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1184 }; 1185 1186 #define EXT4_INODE_BIT_FNS(name, field) \ 1187 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1188 { \ 1189 return test_bit(bit, &EXT4_I(inode)->i_##field); \ 1190 } \ 1191 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1192 { \ 1193 set_bit(bit, &EXT4_I(inode)->i_##field); \ 1194 } \ 1195 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1196 { \ 1197 clear_bit(bit, &EXT4_I(inode)->i_##field); \ 1198 } 1199 1200 EXT4_INODE_BIT_FNS(flag, flags) 1201 EXT4_INODE_BIT_FNS(state, state_flags) 1202 #else 1203 /* Assume that user mode programs are passing in an ext4fs superblock, not 1204 * a kernel struct super_block. This will allow us to call the feature-test 1205 * macros from user land. */ 1206 #define EXT4_SB(sb) (sb) 1207 #endif 1208 1209 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1210 1211 /* 1212 * Codes for operating systems 1213 */ 1214 #define EXT4_OS_LINUX 0 1215 #define EXT4_OS_HURD 1 1216 #define EXT4_OS_MASIX 2 1217 #define EXT4_OS_FREEBSD 3 1218 #define EXT4_OS_LITES 4 1219 1220 /* 1221 * Revision levels 1222 */ 1223 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1224 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1225 1226 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1227 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1228 1229 #define EXT4_GOOD_OLD_INODE_SIZE 128 1230 1231 /* 1232 * Feature set definitions 1233 */ 1234 1235 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1236 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1237 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1238 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1239 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1240 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1241 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1242 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1243 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1244 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1245 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1246 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1247 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1248 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1249 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1250 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1251 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1252 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1253 1254 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1255 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1256 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1257 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1258 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1259 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1260 1261 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1262 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1263 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1264 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1265 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1266 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1267 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1268 1269 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1270 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1271 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1272 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1273 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1274 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1275 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1276 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1277 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1278 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1279 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1280 1281 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 1282 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1283 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1284 EXT4_FEATURE_INCOMPAT_META_BG| \ 1285 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1286 EXT4_FEATURE_INCOMPAT_64BIT| \ 1287 EXT4_FEATURE_INCOMPAT_FLEX_BG) 1288 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1289 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1290 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1291 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1292 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1293 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1294 EXT4_FEATURE_RO_COMPAT_HUGE_FILE) 1295 1296 /* 1297 * Default values for user and/or group using reserved blocks 1298 */ 1299 #define EXT4_DEF_RESUID 0 1300 #define EXT4_DEF_RESGID 0 1301 1302 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1303 1304 /* 1305 * Default mount options 1306 */ 1307 #define EXT4_DEFM_DEBUG 0x0001 1308 #define EXT4_DEFM_BSDGROUPS 0x0002 1309 #define EXT4_DEFM_XATTR_USER 0x0004 1310 #define EXT4_DEFM_ACL 0x0008 1311 #define EXT4_DEFM_UID16 0x0010 1312 #define EXT4_DEFM_JMODE 0x0060 1313 #define EXT4_DEFM_JMODE_DATA 0x0020 1314 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1315 #define EXT4_DEFM_JMODE_WBACK 0x0060 1316 1317 /* 1318 * Default journal batch times 1319 */ 1320 #define EXT4_DEF_MIN_BATCH_TIME 0 1321 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1322 1323 /* 1324 * Minimum number of groups in a flexgroup before we separate out 1325 * directories into the first block group of a flexgroup 1326 */ 1327 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1328 1329 /* 1330 * Structure of a directory entry 1331 */ 1332 #define EXT4_NAME_LEN 255 1333 1334 struct ext4_dir_entry { 1335 __le32 inode; /* Inode number */ 1336 __le16 rec_len; /* Directory entry length */ 1337 __le16 name_len; /* Name length */ 1338 char name[EXT4_NAME_LEN]; /* File name */ 1339 }; 1340 1341 /* 1342 * The new version of the directory entry. Since EXT4 structures are 1343 * stored in intel byte order, and the name_len field could never be 1344 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1345 * file_type field. 1346 */ 1347 struct ext4_dir_entry_2 { 1348 __le32 inode; /* Inode number */ 1349 __le16 rec_len; /* Directory entry length */ 1350 __u8 name_len; /* Name length */ 1351 __u8 file_type; 1352 char name[EXT4_NAME_LEN]; /* File name */ 1353 }; 1354 1355 /* 1356 * Ext4 directory file types. Only the low 3 bits are used. The 1357 * other bits are reserved for now. 1358 */ 1359 #define EXT4_FT_UNKNOWN 0 1360 #define EXT4_FT_REG_FILE 1 1361 #define EXT4_FT_DIR 2 1362 #define EXT4_FT_CHRDEV 3 1363 #define EXT4_FT_BLKDEV 4 1364 #define EXT4_FT_FIFO 5 1365 #define EXT4_FT_SOCK 6 1366 #define EXT4_FT_SYMLINK 7 1367 1368 #define EXT4_FT_MAX 8 1369 1370 /* 1371 * EXT4_DIR_PAD defines the directory entries boundaries 1372 * 1373 * NOTE: It must be a multiple of 4 1374 */ 1375 #define EXT4_DIR_PAD 4 1376 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1377 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1378 ~EXT4_DIR_ROUND) 1379 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1380 1381 /* 1382 * Hash Tree Directory indexing 1383 * (c) Daniel Phillips, 2001 1384 */ 1385 1386 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 1387 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 1388 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 1389 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 1390 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 1391 1392 /* Legal values for the dx_root hash_version field: */ 1393 1394 #define DX_HASH_LEGACY 0 1395 #define DX_HASH_HALF_MD4 1 1396 #define DX_HASH_TEA 2 1397 #define DX_HASH_LEGACY_UNSIGNED 3 1398 #define DX_HASH_HALF_MD4_UNSIGNED 4 1399 #define DX_HASH_TEA_UNSIGNED 5 1400 1401 #ifdef __KERNEL__ 1402 1403 /* hash info structure used by the directory hash */ 1404 struct dx_hash_info 1405 { 1406 u32 hash; 1407 u32 minor_hash; 1408 int hash_version; 1409 u32 *seed; 1410 }; 1411 1412 #define EXT4_HTREE_EOF 0x7fffffff 1413 1414 /* 1415 * Control parameters used by ext4_htree_next_block 1416 */ 1417 #define HASH_NB_ALWAYS 1 1418 1419 1420 /* 1421 * Describe an inode's exact location on disk and in memory 1422 */ 1423 struct ext4_iloc 1424 { 1425 struct buffer_head *bh; 1426 unsigned long offset; 1427 ext4_group_t block_group; 1428 }; 1429 1430 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 1431 { 1432 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 1433 } 1434 1435 /* 1436 * This structure is stuffed into the struct file's private_data field 1437 * for directories. It is where we put information so that we can do 1438 * readdir operations in hash tree order. 1439 */ 1440 struct dir_private_info { 1441 struct rb_root root; 1442 struct rb_node *curr_node; 1443 struct fname *extra_fname; 1444 loff_t last_pos; 1445 __u32 curr_hash; 1446 __u32 curr_minor_hash; 1447 __u32 next_hash; 1448 }; 1449 1450 /* calculate the first block number of the group */ 1451 static inline ext4_fsblk_t 1452 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 1453 { 1454 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 1455 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 1456 } 1457 1458 /* 1459 * Special error return code only used by dx_probe() and its callers. 1460 */ 1461 #define ERR_BAD_DX_DIR -75000 1462 1463 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, 1464 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); 1465 1466 extern struct proc_dir_entry *ext4_proc_root; 1467 1468 /* 1469 * Function prototypes 1470 */ 1471 1472 /* 1473 * Ok, these declarations are also in <linux/kernel.h> but none of the 1474 * ext4 source programs needs to include it so they are duplicated here. 1475 */ 1476 # define NORET_TYPE /**/ 1477 # define ATTRIB_NORET __attribute__((noreturn)) 1478 # define NORET_AND noreturn, 1479 1480 /* bitmap.c */ 1481 extern unsigned int ext4_count_free(struct buffer_head *, unsigned); 1482 1483 /* balloc.c */ 1484 extern unsigned int ext4_block_group(struct super_block *sb, 1485 ext4_fsblk_t blocknr); 1486 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 1487 ext4_fsblk_t blocknr); 1488 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 1489 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 1490 ext4_group_t group); 1491 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 1492 ext4_fsblk_t goal, unsigned long *count, int *errp); 1493 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); 1494 extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); 1495 extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb, 1496 ext4_fsblk_t block, unsigned long count); 1497 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *); 1498 extern void ext4_check_blocks_bitmap(struct super_block *); 1499 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 1500 ext4_group_t block_group, 1501 struct buffer_head ** bh); 1502 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1503 struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 1504 ext4_group_t block_group); 1505 extern unsigned ext4_init_block_bitmap(struct super_block *sb, 1506 struct buffer_head *bh, 1507 ext4_group_t group, 1508 struct ext4_group_desc *desc); 1509 #define ext4_free_blocks_after_init(sb, group, desc) \ 1510 ext4_init_block_bitmap(sb, NULL, group, desc) 1511 1512 /* dir.c */ 1513 extern int ext4_check_dir_entry(const char *, struct inode *, 1514 struct ext4_dir_entry_2 *, 1515 struct buffer_head *, unsigned int); 1516 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 1517 __u32 minor_hash, 1518 struct ext4_dir_entry_2 *dirent); 1519 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 1520 1521 /* fsync.c */ 1522 extern int ext4_sync_file(struct file *, int); 1523 1524 /* hash.c */ 1525 extern int ext4fs_dirhash(const char *name, int len, struct 1526 dx_hash_info *hinfo); 1527 1528 /* ialloc.c */ 1529 extern struct inode *ext4_new_inode(handle_t *, struct inode *, int, 1530 const struct qstr *qstr, __u32 goal); 1531 extern void ext4_free_inode(handle_t *, struct inode *); 1532 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 1533 extern unsigned long ext4_count_free_inodes(struct super_block *); 1534 extern unsigned long ext4_count_dirs(struct super_block *); 1535 extern void ext4_check_inodes_bitmap(struct super_block *); 1536 extern unsigned ext4_init_inode_bitmap(struct super_block *sb, 1537 struct buffer_head *bh, 1538 ext4_group_t group, 1539 struct ext4_group_desc *desc); 1540 extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 1541 1542 /* mballoc.c */ 1543 extern long ext4_mb_stats; 1544 extern long ext4_mb_max_to_scan; 1545 extern int ext4_mb_init(struct super_block *, int); 1546 extern int ext4_mb_release(struct super_block *); 1547 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 1548 struct ext4_allocation_request *, int *); 1549 extern int ext4_mb_reserve_blocks(struct super_block *, int); 1550 extern void ext4_discard_preallocations(struct inode *); 1551 extern int __init init_ext4_mballoc(void); 1552 extern void exit_ext4_mballoc(void); 1553 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 1554 struct buffer_head *bh, ext4_fsblk_t block, 1555 unsigned long count, int flags); 1556 extern int ext4_mb_add_groupinfo(struct super_block *sb, 1557 ext4_group_t i, struct ext4_group_desc *desc); 1558 extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t); 1559 extern void ext4_mb_put_buddy_cache_lock(struct super_block *, 1560 ext4_group_t, int); 1561 /* inode.c */ 1562 struct buffer_head *ext4_getblk(handle_t *, struct inode *, 1563 ext4_lblk_t, int, int *); 1564 struct buffer_head *ext4_bread(handle_t *, struct inode *, 1565 ext4_lblk_t, int, int *); 1566 int ext4_get_block(struct inode *inode, sector_t iblock, 1567 struct buffer_head *bh_result, int create); 1568 1569 extern struct inode *ext4_iget(struct super_block *, unsigned long); 1570 extern int ext4_write_inode(struct inode *, struct writeback_control *); 1571 extern int ext4_setattr(struct dentry *, struct iattr *); 1572 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 1573 struct kstat *stat); 1574 extern void ext4_delete_inode(struct inode *); 1575 extern int ext4_sync_inode(handle_t *, struct inode *); 1576 extern void ext4_dirty_inode(struct inode *); 1577 extern int ext4_change_inode_journal_flag(struct inode *, int); 1578 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 1579 extern int ext4_can_truncate(struct inode *inode); 1580 extern void ext4_truncate(struct inode *); 1581 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 1582 extern void ext4_set_inode_flags(struct inode *); 1583 extern void ext4_get_inode_flags(struct ext4_inode_info *); 1584 extern int ext4_alloc_da_blocks(struct inode *inode); 1585 extern void ext4_set_aops(struct inode *inode); 1586 extern int ext4_writepage_trans_blocks(struct inode *); 1587 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks); 1588 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 1589 extern int ext4_block_truncate_page(handle_t *handle, 1590 struct address_space *mapping, loff_t from); 1591 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 1592 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 1593 extern int flush_completed_IO(struct inode *inode); 1594 extern void ext4_da_update_reserve_space(struct inode *inode, 1595 int used, int quota_claim); 1596 /* ioctl.c */ 1597 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 1598 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 1599 1600 /* migrate.c */ 1601 extern int ext4_ext_migrate(struct inode *); 1602 1603 /* namei.c */ 1604 extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize); 1605 extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize); 1606 extern int ext4_orphan_add(handle_t *, struct inode *); 1607 extern int ext4_orphan_del(handle_t *, struct inode *); 1608 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 1609 __u32 start_minor_hash, __u32 *next_hash); 1610 1611 /* resize.c */ 1612 extern int ext4_group_add(struct super_block *sb, 1613 struct ext4_new_group_data *input); 1614 extern int ext4_group_extend(struct super_block *sb, 1615 struct ext4_super_block *es, 1616 ext4_fsblk_t n_blocks_count); 1617 1618 /* super.c */ 1619 extern void __ext4_error(struct super_block *, const char *, const char *, ...) 1620 __attribute__ ((format (printf, 3, 4))); 1621 #define ext4_error(sb, message...) __ext4_error(sb, __func__, ## message) 1622 extern void ext4_error_inode(const char *, struct inode *, const char *, ...) 1623 __attribute__ ((format (printf, 3, 4))); 1624 extern void ext4_error_file(const char *, struct file *, const char *, ...) 1625 __attribute__ ((format (printf, 3, 4))); 1626 extern void __ext4_std_error(struct super_block *, const char *, int); 1627 extern void ext4_abort(struct super_block *, const char *, const char *, ...) 1628 __attribute__ ((format (printf, 3, 4))); 1629 extern void __ext4_warning(struct super_block *, const char *, 1630 const char *, ...) 1631 __attribute__ ((format (printf, 3, 4))); 1632 #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, ## message) 1633 extern void ext4_msg(struct super_block *, const char *, const char *, ...) 1634 __attribute__ ((format (printf, 3, 4))); 1635 extern void ext4_grp_locked_error(struct super_block *, ext4_group_t, 1636 const char *, const char *, ...) 1637 __attribute__ ((format (printf, 4, 5))); 1638 extern void ext4_update_dynamic_rev(struct super_block *sb); 1639 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 1640 __u32 compat); 1641 extern int ext4_update_rocompat_feature(handle_t *handle, 1642 struct super_block *sb, __u32 rocompat); 1643 extern int ext4_update_incompat_feature(handle_t *handle, 1644 struct super_block *sb, __u32 incompat); 1645 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 1646 struct ext4_group_desc *bg); 1647 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 1648 struct ext4_group_desc *bg); 1649 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 1650 struct ext4_group_desc *bg); 1651 extern __u32 ext4_free_blks_count(struct super_block *sb, 1652 struct ext4_group_desc *bg); 1653 extern __u32 ext4_free_inodes_count(struct super_block *sb, 1654 struct ext4_group_desc *bg); 1655 extern __u32 ext4_used_dirs_count(struct super_block *sb, 1656 struct ext4_group_desc *bg); 1657 extern __u32 ext4_itable_unused_count(struct super_block *sb, 1658 struct ext4_group_desc *bg); 1659 extern void ext4_block_bitmap_set(struct super_block *sb, 1660 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1661 extern void ext4_inode_bitmap_set(struct super_block *sb, 1662 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1663 extern void ext4_inode_table_set(struct super_block *sb, 1664 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1665 extern void ext4_free_blks_set(struct super_block *sb, 1666 struct ext4_group_desc *bg, __u32 count); 1667 extern void ext4_free_inodes_set(struct super_block *sb, 1668 struct ext4_group_desc *bg, __u32 count); 1669 extern void ext4_used_dirs_set(struct super_block *sb, 1670 struct ext4_group_desc *bg, __u32 count); 1671 extern void ext4_itable_unused_set(struct super_block *sb, 1672 struct ext4_group_desc *bg, __u32 count); 1673 extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group, 1674 struct ext4_group_desc *gdp); 1675 extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group, 1676 struct ext4_group_desc *gdp); 1677 1678 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 1679 { 1680 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 1681 le32_to_cpu(es->s_blocks_count_lo); 1682 } 1683 1684 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 1685 { 1686 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 1687 le32_to_cpu(es->s_r_blocks_count_lo); 1688 } 1689 1690 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 1691 { 1692 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 1693 le32_to_cpu(es->s_free_blocks_count_lo); 1694 } 1695 1696 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 1697 ext4_fsblk_t blk) 1698 { 1699 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 1700 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 1701 } 1702 1703 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 1704 ext4_fsblk_t blk) 1705 { 1706 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 1707 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 1708 } 1709 1710 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 1711 ext4_fsblk_t blk) 1712 { 1713 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 1714 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 1715 } 1716 1717 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 1718 { 1719 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 1720 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 1721 le32_to_cpu(raw_inode->i_size_lo); 1722 else 1723 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 1724 } 1725 1726 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 1727 { 1728 raw_inode->i_size_lo = cpu_to_le32(i_size); 1729 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 1730 } 1731 1732 static inline 1733 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 1734 ext4_group_t group) 1735 { 1736 struct ext4_group_info ***grp_info; 1737 long indexv, indexh; 1738 grp_info = EXT4_SB(sb)->s_group_info; 1739 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 1740 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 1741 return grp_info[indexv][indexh]; 1742 } 1743 1744 /* 1745 * Reading s_groups_count requires using smp_rmb() afterwards. See 1746 * the locking protocol documented in the comments of ext4_group_add() 1747 * in resize.c 1748 */ 1749 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 1750 { 1751 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 1752 1753 smp_rmb(); 1754 return ngroups; 1755 } 1756 1757 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 1758 ext4_group_t block_group) 1759 { 1760 return block_group >> sbi->s_log_groups_per_flex; 1761 } 1762 1763 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 1764 { 1765 return 1 << sbi->s_log_groups_per_flex; 1766 } 1767 1768 #define ext4_std_error(sb, errno) \ 1769 do { \ 1770 if ((errno)) \ 1771 __ext4_std_error((sb), __func__, (errno)); \ 1772 } while (0) 1773 1774 #ifdef CONFIG_SMP 1775 /* Each CPU can accumulate percpu_counter_batch blocks in their local 1776 * counters. So we need to make sure we have free blocks more 1777 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 1778 */ 1779 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 1780 #else 1781 #define EXT4_FREEBLOCKS_WATERMARK 0 1782 #endif 1783 1784 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 1785 { 1786 /* 1787 * XXX: replace with spinlock if seen contended -bzzz 1788 */ 1789 down_write(&EXT4_I(inode)->i_data_sem); 1790 if (newsize > EXT4_I(inode)->i_disksize) 1791 EXT4_I(inode)->i_disksize = newsize; 1792 up_write(&EXT4_I(inode)->i_data_sem); 1793 return ; 1794 } 1795 1796 struct ext4_group_info { 1797 unsigned long bb_state; 1798 struct rb_root bb_free_root; 1799 ext4_grpblk_t bb_first_free; /* first free block */ 1800 ext4_grpblk_t bb_free; /* total free blocks */ 1801 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 1802 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 1803 struct list_head bb_prealloc_list; 1804 #ifdef DOUBLE_CHECK 1805 void *bb_bitmap; 1806 #endif 1807 struct rw_semaphore alloc_sem; 1808 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 1809 * regions, index is order. 1810 * bb_counters[3] = 5 means 1811 * 5 free 8-block regions. */ 1812 }; 1813 1814 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 1815 1816 #define EXT4_MB_GRP_NEED_INIT(grp) \ 1817 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 1818 1819 #define EXT4_MAX_CONTENTION 8 1820 #define EXT4_CONTENTION_THRESHOLD 2 1821 1822 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 1823 ext4_group_t group) 1824 { 1825 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 1826 } 1827 1828 /* 1829 * Returns true if the filesystem is busy enough that attempts to 1830 * access the block group locks has run into contention. 1831 */ 1832 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 1833 { 1834 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 1835 } 1836 1837 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 1838 { 1839 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 1840 if (spin_trylock(lock)) 1841 /* 1842 * We're able to grab the lock right away, so drop the 1843 * lock contention counter. 1844 */ 1845 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 1846 else { 1847 /* 1848 * The lock is busy, so bump the contention counter, 1849 * and then wait on the spin lock. 1850 */ 1851 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 1852 EXT4_MAX_CONTENTION); 1853 spin_lock(lock); 1854 } 1855 } 1856 1857 static inline void ext4_unlock_group(struct super_block *sb, 1858 ext4_group_t group) 1859 { 1860 spin_unlock(ext4_group_lock_ptr(sb, group)); 1861 } 1862 1863 /* 1864 * Inodes and files operations 1865 */ 1866 1867 /* dir.c */ 1868 extern const struct file_operations ext4_dir_operations; 1869 1870 /* file.c */ 1871 extern const struct inode_operations ext4_file_inode_operations; 1872 extern const struct file_operations ext4_file_operations; 1873 1874 /* namei.c */ 1875 extern const struct inode_operations ext4_dir_inode_operations; 1876 extern const struct inode_operations ext4_special_inode_operations; 1877 extern struct dentry *ext4_get_parent(struct dentry *child); 1878 1879 /* symlink.c */ 1880 extern const struct inode_operations ext4_symlink_inode_operations; 1881 extern const struct inode_operations ext4_fast_symlink_inode_operations; 1882 1883 /* block_validity */ 1884 extern void ext4_release_system_zone(struct super_block *sb); 1885 extern int ext4_setup_system_zone(struct super_block *sb); 1886 extern int __init init_ext4_system_zone(void); 1887 extern void exit_ext4_system_zone(void); 1888 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 1889 ext4_fsblk_t start_blk, 1890 unsigned int count); 1891 1892 /* extents.c */ 1893 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 1894 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 1895 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, 1896 int chunk); 1897 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 1898 struct ext4_map_blocks *map, int flags); 1899 extern void ext4_ext_truncate(struct inode *); 1900 extern void ext4_ext_init(struct super_block *); 1901 extern void ext4_ext_release(struct super_block *); 1902 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset, 1903 loff_t len); 1904 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset, 1905 ssize_t len); 1906 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 1907 struct ext4_map_blocks *map, int flags); 1908 extern int ext4_get_blocks(handle_t *handle, struct inode *inode, 1909 sector_t block, unsigned int max_blocks, 1910 struct buffer_head *bh, int flags); 1911 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1912 __u64 start, __u64 len); 1913 /* move_extent.c */ 1914 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 1915 __u64 start_orig, __u64 start_donor, 1916 __u64 len, __u64 *moved_len); 1917 1918 1919 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */ 1920 enum ext4_state_bits { 1921 BH_Uninit /* blocks are allocated but uninitialized on disk */ 1922 = BH_JBDPrivateStart, 1923 }; 1924 1925 BUFFER_FNS(Uninit, uninit) 1926 TAS_BUFFER_FNS(Uninit, uninit) 1927 1928 /* 1929 * Add new method to test wether block and inode bitmaps are properly 1930 * initialized. With uninit_bg reading the block from disk is not enough 1931 * to mark the bitmap uptodate. We need to also zero-out the bitmap 1932 */ 1933 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 1934 1935 static inline int bitmap_uptodate(struct buffer_head *bh) 1936 { 1937 return (buffer_uptodate(bh) && 1938 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 1939 } 1940 static inline void set_bitmap_uptodate(struct buffer_head *bh) 1941 { 1942 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 1943 } 1944 1945 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 1946 1947 #endif /* __KERNEL__ */ 1948 1949 #endif /* _EXT4_H */ 1950