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, fmt, a...) \ 66 ext4_error_file(__func__, __LINE__, (file), (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 111 112 113 struct ext4_allocation_request { 114 /* target inode for block we're allocating */ 115 struct inode *inode; 116 /* how many blocks we want to allocate */ 117 unsigned int len; 118 /* logical block in target inode */ 119 ext4_lblk_t logical; 120 /* the closest logical allocated block to the left */ 121 ext4_lblk_t lleft; 122 /* the closest logical allocated block to the right */ 123 ext4_lblk_t lright; 124 /* phys. target (a hint) */ 125 ext4_fsblk_t goal; 126 /* phys. block for the closest logical allocated block to the left */ 127 ext4_fsblk_t pleft; 128 /* phys. block for the closest logical allocated block to the right */ 129 ext4_fsblk_t pright; 130 /* flags. see above EXT4_MB_HINT_* */ 131 unsigned int flags; 132 }; 133 134 /* 135 * Logical to physical block mapping, used by ext4_map_blocks() 136 * 137 * This structure is used to pass requests into ext4_map_blocks() as 138 * well as to store the information returned by ext4_map_blocks(). It 139 * takes less room on the stack than a struct buffer_head. 140 */ 141 #define EXT4_MAP_NEW (1 << BH_New) 142 #define EXT4_MAP_MAPPED (1 << BH_Mapped) 143 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 144 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 145 #define EXT4_MAP_UNINIT (1 << BH_Uninit) 146 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 147 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\ 148 EXT4_MAP_UNINIT) 149 150 struct ext4_map_blocks { 151 ext4_fsblk_t m_pblk; 152 ext4_lblk_t m_lblk; 153 unsigned int m_len; 154 unsigned int m_flags; 155 }; 156 157 /* 158 * For delayed allocation tracking 159 */ 160 struct mpage_da_data { 161 struct inode *inode; 162 sector_t b_blocknr; /* start block number of extent */ 163 size_t b_size; /* size of extent */ 164 unsigned long b_state; /* state of the extent */ 165 unsigned long first_page, next_page; /* extent of pages */ 166 struct writeback_control *wbc; 167 int io_done; 168 int pages_written; 169 int retval; 170 }; 171 #define EXT4_IO_UNWRITTEN 0x1 172 typedef struct ext4_io_end { 173 struct list_head list; /* per-file finished AIO list */ 174 struct inode *inode; /* file being written to */ 175 unsigned int flag; /* unwritten or not */ 176 struct page *page; /* page struct for buffer write */ 177 loff_t offset; /* offset in the file */ 178 ssize_t size; /* size of the extent */ 179 struct work_struct work; /* data work queue */ 180 } ext4_io_end_t; 181 182 /* 183 * Special inodes numbers 184 */ 185 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 186 #define EXT4_ROOT_INO 2 /* Root inode */ 187 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 188 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 189 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 190 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 191 192 /* First non-reserved inode for old ext4 filesystems */ 193 #define EXT4_GOOD_OLD_FIRST_INO 11 194 195 /* 196 * Maximal count of links to a file 197 */ 198 #define EXT4_LINK_MAX 65000 199 200 /* 201 * Macro-instructions used to manage several block sizes 202 */ 203 #define EXT4_MIN_BLOCK_SIZE 1024 204 #define EXT4_MAX_BLOCK_SIZE 65536 205 #define EXT4_MIN_BLOCK_LOG_SIZE 10 206 #ifdef __KERNEL__ 207 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 208 #else 209 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 210 #endif 211 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 212 #ifdef __KERNEL__ 213 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 214 #else 215 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 216 #endif 217 #ifdef __KERNEL__ 218 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 219 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 220 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 221 #else 222 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 223 EXT4_GOOD_OLD_INODE_SIZE : \ 224 (s)->s_inode_size) 225 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 226 EXT4_GOOD_OLD_FIRST_INO : \ 227 (s)->s_first_ino) 228 #endif 229 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 230 231 /* 232 * Structure of a blocks group descriptor 233 */ 234 struct ext4_group_desc 235 { 236 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 237 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 238 __le32 bg_inode_table_lo; /* Inodes table block */ 239 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 240 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 241 __le16 bg_used_dirs_count_lo; /* Directories count */ 242 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 243 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ 244 __le16 bg_itable_unused_lo; /* Unused inodes count */ 245 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 246 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 247 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 248 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 249 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 250 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 251 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 252 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 253 __u32 bg_reserved2[3]; 254 }; 255 256 /* 257 * Structure of a flex block group info 258 */ 259 260 struct flex_groups { 261 atomic_t free_inodes; 262 atomic_t free_blocks; 263 atomic_t used_dirs; 264 }; 265 266 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 267 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 268 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 269 270 /* 271 * Macro-instructions used to manage group descriptors 272 */ 273 #define EXT4_MIN_DESC_SIZE 32 274 #define EXT4_MIN_DESC_SIZE_64BIT 64 275 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 276 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 277 #ifdef __KERNEL__ 278 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 279 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 280 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 281 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 282 #else 283 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 284 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 285 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 286 #endif 287 288 /* 289 * Constants relative to the data blocks 290 */ 291 #define EXT4_NDIR_BLOCKS 12 292 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 293 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 294 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 295 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 296 297 /* 298 * Inode flags 299 */ 300 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 301 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 302 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 303 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 304 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 305 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 306 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 307 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 308 /* Reserved for compression usage... */ 309 #define EXT4_DIRTY_FL 0x00000100 310 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 311 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 312 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 313 /* End compression flags --- maybe not all used */ 314 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 315 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 316 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 317 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 318 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 319 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 320 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 321 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 322 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 323 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 324 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 325 326 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 327 #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ 328 329 /* Flags that should be inherited by new inodes from their parent. */ 330 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 331 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\ 332 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 333 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 334 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 335 336 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 337 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 338 339 /* Flags that are appropriate for non-directories/regular files. */ 340 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 341 342 /* Mask out flags that are inappropriate for the given type of inode. */ 343 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 344 { 345 if (S_ISDIR(mode)) 346 return flags; 347 else if (S_ISREG(mode)) 348 return flags & EXT4_REG_FLMASK; 349 else 350 return flags & EXT4_OTHER_FLMASK; 351 } 352 353 /* 354 * Inode flags used for atomic set/get 355 */ 356 enum { 357 EXT4_INODE_SECRM = 0, /* Secure deletion */ 358 EXT4_INODE_UNRM = 1, /* Undelete */ 359 EXT4_INODE_COMPR = 2, /* Compress file */ 360 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 361 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 362 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 363 EXT4_INODE_NODUMP = 6, /* do not dump file */ 364 EXT4_INODE_NOATIME = 7, /* do not update atime */ 365 /* Reserved for compression usage... */ 366 EXT4_INODE_DIRTY = 8, 367 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 368 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 369 EXT4_INODE_ECOMPR = 11, /* Compression error */ 370 /* End compression flags --- maybe not all used */ 371 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 372 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 373 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 374 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 375 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 376 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 377 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 378 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 379 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 380 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 381 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 382 }; 383 384 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 385 #define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \ 386 printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \ 387 EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); } 388 389 /* 390 * Since it's pretty easy to mix up bit numbers and hex values, and we 391 * can't do a compile-time test for ENUM values, we use a run-time 392 * test to make sure that EXT4_XXX_FL is consistent with respect to 393 * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop 394 * out so it won't cost any extra space in the compiled kernel image. 395 * But it's important that these values are the same, since we are 396 * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL 397 * must be consistent with the values of FS_XXX_FL defined in 398 * include/linux/fs.h and the on-disk values found in ext2, ext3, and 399 * ext4 filesystems, and of course the values defined in e2fsprogs. 400 * 401 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 402 */ 403 static inline void ext4_check_flag_values(void) 404 { 405 CHECK_FLAG_VALUE(SECRM); 406 CHECK_FLAG_VALUE(UNRM); 407 CHECK_FLAG_VALUE(COMPR); 408 CHECK_FLAG_VALUE(SYNC); 409 CHECK_FLAG_VALUE(IMMUTABLE); 410 CHECK_FLAG_VALUE(APPEND); 411 CHECK_FLAG_VALUE(NODUMP); 412 CHECK_FLAG_VALUE(NOATIME); 413 CHECK_FLAG_VALUE(DIRTY); 414 CHECK_FLAG_VALUE(COMPRBLK); 415 CHECK_FLAG_VALUE(NOCOMPR); 416 CHECK_FLAG_VALUE(ECOMPR); 417 CHECK_FLAG_VALUE(INDEX); 418 CHECK_FLAG_VALUE(IMAGIC); 419 CHECK_FLAG_VALUE(JOURNAL_DATA); 420 CHECK_FLAG_VALUE(NOTAIL); 421 CHECK_FLAG_VALUE(DIRSYNC); 422 CHECK_FLAG_VALUE(TOPDIR); 423 CHECK_FLAG_VALUE(HUGE_FILE); 424 CHECK_FLAG_VALUE(EXTENTS); 425 CHECK_FLAG_VALUE(EA_INODE); 426 CHECK_FLAG_VALUE(EOFBLOCKS); 427 CHECK_FLAG_VALUE(RESERVED); 428 } 429 430 /* Used to pass group descriptor data when online resize is done */ 431 struct ext4_new_group_input { 432 __u32 group; /* Group number for this data */ 433 __u64 block_bitmap; /* Absolute block number of block bitmap */ 434 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 435 __u64 inode_table; /* Absolute block number of inode table start */ 436 __u32 blocks_count; /* Total number of blocks in this group */ 437 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 438 __u16 unused; 439 }; 440 441 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 442 struct compat_ext4_new_group_input { 443 u32 group; 444 compat_u64 block_bitmap; 445 compat_u64 inode_bitmap; 446 compat_u64 inode_table; 447 u32 blocks_count; 448 u16 reserved_blocks; 449 u16 unused; 450 }; 451 #endif 452 453 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 454 struct ext4_new_group_data { 455 __u32 group; 456 __u64 block_bitmap; 457 __u64 inode_bitmap; 458 __u64 inode_table; 459 __u32 blocks_count; 460 __u16 reserved_blocks; 461 __u16 unused; 462 __u32 free_blocks_count; 463 }; 464 465 /* 466 * Flags used by ext4_get_blocks() 467 */ 468 /* Allocate any needed blocks and/or convert an unitialized 469 extent to be an initialized ext4 */ 470 #define EXT4_GET_BLOCKS_CREATE 0x0001 471 /* Request the creation of an unitialized extent */ 472 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 473 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ 474 EXT4_GET_BLOCKS_CREATE) 475 /* Caller is from the delayed allocation writeout path, 476 so set the magic i_delalloc_reserve_flag after taking the 477 inode allocation semaphore for */ 478 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 479 /* caller is from the direct IO path, request to creation of an 480 unitialized extents if not allocated, split the uninitialized 481 extent if blocks has been preallocated already*/ 482 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 483 #define EXT4_GET_BLOCKS_CONVERT 0x0010 484 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 485 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 486 /* Convert extent to initialized after IO complete */ 487 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 488 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 489 490 /* 491 * Flags used by ext4_free_blocks 492 */ 493 #define EXT4_FREE_BLOCKS_METADATA 0x0001 494 #define EXT4_FREE_BLOCKS_FORGET 0x0002 495 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 496 497 /* 498 * ioctl commands 499 */ 500 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 501 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 502 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 503 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 504 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 505 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 506 #ifdef CONFIG_JBD2_DEBUG 507 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long) 508 #endif 509 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 510 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 511 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 512 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 513 #define EXT4_IOC_MIGRATE _IO('f', 9) 514 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 515 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 516 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 517 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 518 519 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 520 /* 521 * ioctl commands in 32 bit emulation 522 */ 523 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 524 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 525 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 526 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 527 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 528 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 529 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 530 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 531 #ifdef CONFIG_JBD2_DEBUG 532 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int) 533 #endif 534 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 535 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 536 #endif 537 538 539 /* 540 * Mount options 541 */ 542 struct ext4_mount_options { 543 unsigned long s_mount_opt; 544 uid_t s_resuid; 545 gid_t s_resgid; 546 unsigned long s_commit_interval; 547 u32 s_min_batch_time, s_max_batch_time; 548 #ifdef CONFIG_QUOTA 549 int s_jquota_fmt; 550 char *s_qf_names[MAXQUOTAS]; 551 #endif 552 }; 553 554 /* Max physical block we can addres w/o extents */ 555 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 556 557 /* 558 * Structure of an inode on the disk 559 */ 560 struct ext4_inode { 561 __le16 i_mode; /* File mode */ 562 __le16 i_uid; /* Low 16 bits of Owner Uid */ 563 __le32 i_size_lo; /* Size in bytes */ 564 __le32 i_atime; /* Access time */ 565 __le32 i_ctime; /* Inode Change time */ 566 __le32 i_mtime; /* Modification time */ 567 __le32 i_dtime; /* Deletion Time */ 568 __le16 i_gid; /* Low 16 bits of Group Id */ 569 __le16 i_links_count; /* Links count */ 570 __le32 i_blocks_lo; /* Blocks count */ 571 __le32 i_flags; /* File flags */ 572 union { 573 struct { 574 __le32 l_i_version; 575 } linux1; 576 struct { 577 __u32 h_i_translator; 578 } hurd1; 579 struct { 580 __u32 m_i_reserved1; 581 } masix1; 582 } osd1; /* OS dependent 1 */ 583 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 584 __le32 i_generation; /* File version (for NFS) */ 585 __le32 i_file_acl_lo; /* File ACL */ 586 __le32 i_size_high; 587 __le32 i_obso_faddr; /* Obsoleted fragment address */ 588 union { 589 struct { 590 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 591 __le16 l_i_file_acl_high; 592 __le16 l_i_uid_high; /* these 2 fields */ 593 __le16 l_i_gid_high; /* were reserved2[0] */ 594 __u32 l_i_reserved2; 595 } linux2; 596 struct { 597 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 598 __u16 h_i_mode_high; 599 __u16 h_i_uid_high; 600 __u16 h_i_gid_high; 601 __u32 h_i_author; 602 } hurd2; 603 struct { 604 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 605 __le16 m_i_file_acl_high; 606 __u32 m_i_reserved2[2]; 607 } masix2; 608 } osd2; /* OS dependent 2 */ 609 __le16 i_extra_isize; 610 __le16 i_pad1; 611 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 612 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 613 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 614 __le32 i_crtime; /* File Creation time */ 615 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 616 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 617 }; 618 619 struct move_extent { 620 __u32 reserved; /* should be zero */ 621 __u32 donor_fd; /* donor file descriptor */ 622 __u64 orig_start; /* logical start offset in block for orig */ 623 __u64 donor_start; /* logical start offset in block for donor */ 624 __u64 len; /* block length to be moved */ 625 __u64 moved_len; /* moved block length */ 626 }; 627 628 #define EXT4_EPOCH_BITS 2 629 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 630 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 631 632 /* 633 * Extended fields will fit into an inode if the filesystem was formatted 634 * with large inodes (-I 256 or larger) and there are not currently any EAs 635 * consuming all of the available space. For new inodes we always reserve 636 * enough space for the kernel's known extended fields, but for inodes 637 * created with an old kernel this might not have been the case. None of 638 * the extended inode fields is critical for correct filesystem operation. 639 * This macro checks if a certain field fits in the inode. Note that 640 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 641 */ 642 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 643 ((offsetof(typeof(*ext4_inode), field) + \ 644 sizeof((ext4_inode)->field)) \ 645 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 646 (einode)->i_extra_isize)) \ 647 648 static inline __le32 ext4_encode_extra_time(struct timespec *time) 649 { 650 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 651 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | 652 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); 653 } 654 655 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 656 { 657 if (sizeof(time->tv_sec) > 4) 658 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 659 << 32; 660 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 661 } 662 663 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 664 do { \ 665 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 666 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 667 (raw_inode)->xtime ## _extra = \ 668 ext4_encode_extra_time(&(inode)->xtime); \ 669 } while (0) 670 671 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 672 do { \ 673 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 674 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 675 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 676 (raw_inode)->xtime ## _extra = \ 677 ext4_encode_extra_time(&(einode)->xtime); \ 678 } while (0) 679 680 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 681 do { \ 682 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 683 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 684 ext4_decode_extra_time(&(inode)->xtime, \ 685 raw_inode->xtime ## _extra); \ 686 } while (0) 687 688 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 689 do { \ 690 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 691 (einode)->xtime.tv_sec = \ 692 (signed)le32_to_cpu((raw_inode)->xtime); \ 693 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 694 ext4_decode_extra_time(&(einode)->xtime, \ 695 raw_inode->xtime ## _extra); \ 696 } while (0) 697 698 #define i_disk_version osd1.linux1.l_i_version 699 700 #if defined(__KERNEL__) || defined(__linux__) 701 #define i_reserved1 osd1.linux1.l_i_reserved1 702 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 703 #define i_blocks_high osd2.linux2.l_i_blocks_high 704 #define i_uid_low i_uid 705 #define i_gid_low i_gid 706 #define i_uid_high osd2.linux2.l_i_uid_high 707 #define i_gid_high osd2.linux2.l_i_gid_high 708 #define i_reserved2 osd2.linux2.l_i_reserved2 709 710 #elif defined(__GNU__) 711 712 #define i_translator osd1.hurd1.h_i_translator 713 #define i_uid_high osd2.hurd2.h_i_uid_high 714 #define i_gid_high osd2.hurd2.h_i_gid_high 715 #define i_author osd2.hurd2.h_i_author 716 717 #elif defined(__masix__) 718 719 #define i_reserved1 osd1.masix1.m_i_reserved1 720 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 721 #define i_reserved2 osd2.masix2.m_i_reserved2 722 723 #endif /* defined(__KERNEL__) || defined(__linux__) */ 724 725 /* 726 * storage for cached extent 727 */ 728 struct ext4_ext_cache { 729 ext4_fsblk_t ec_start; 730 ext4_lblk_t ec_block; 731 __u32 ec_len; /* must be 32bit to return holes */ 732 __u32 ec_type; 733 }; 734 735 /* 736 * fourth extended file system inode data in memory 737 */ 738 struct ext4_inode_info { 739 __le32 i_data[15]; /* unconverted */ 740 __u32 i_dtime; 741 ext4_fsblk_t i_file_acl; 742 743 /* 744 * i_block_group is the number of the block group which contains 745 * this file's inode. Constant across the lifetime of the inode, 746 * it is ued for making block allocation decisions - we try to 747 * place a file's data blocks near its inode block, and new inodes 748 * near to their parent directory's inode. 749 */ 750 ext4_group_t i_block_group; 751 unsigned long i_state_flags; /* Dynamic state flags */ 752 unsigned long i_flags; 753 754 ext4_lblk_t i_dir_start_lookup; 755 #ifdef CONFIG_EXT4_FS_XATTR 756 /* 757 * Extended attributes can be read independently of the main file 758 * data. Taking i_mutex even when reading would cause contention 759 * between readers of EAs and writers of regular file data, so 760 * instead we synchronize on xattr_sem when reading or changing 761 * EAs. 762 */ 763 struct rw_semaphore xattr_sem; 764 #endif 765 766 struct list_head i_orphan; /* unlinked but open inodes */ 767 768 /* 769 * i_disksize keeps track of what the inode size is ON DISK, not 770 * in memory. During truncate, i_size is set to the new size by 771 * the VFS prior to calling ext4_truncate(), but the filesystem won't 772 * set i_disksize to 0 until the truncate is actually under way. 773 * 774 * The intent is that i_disksize always represents the blocks which 775 * are used by this file. This allows recovery to restart truncate 776 * on orphans if we crash during truncate. We actually write i_disksize 777 * into the on-disk inode when writing inodes out, instead of i_size. 778 * 779 * The only time when i_disksize and i_size may be different is when 780 * a truncate is in progress. The only things which change i_disksize 781 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 782 */ 783 loff_t i_disksize; 784 785 /* 786 * i_data_sem is for serialising ext4_truncate() against 787 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 788 * data tree are chopped off during truncate. We can't do that in 789 * ext4 because whenever we perform intermediate commits during 790 * truncate, the inode and all the metadata blocks *must* be in a 791 * consistent state which allows truncation of the orphans to restart 792 * during recovery. Hence we must fix the get_block-vs-truncate race 793 * by other means, so we have i_data_sem. 794 */ 795 struct rw_semaphore i_data_sem; 796 struct inode vfs_inode; 797 struct jbd2_inode jinode; 798 799 struct ext4_ext_cache i_cached_extent; 800 /* 801 * File creation time. Its function is same as that of 802 * struct timespec i_{a,c,m}time in the generic inode. 803 */ 804 struct timespec i_crtime; 805 806 /* mballoc */ 807 struct list_head i_prealloc_list; 808 spinlock_t i_prealloc_lock; 809 810 /* ialloc */ 811 ext4_group_t i_last_alloc_group; 812 813 /* allocation reservation info for delalloc */ 814 unsigned int i_reserved_data_blocks; 815 unsigned int i_reserved_meta_blocks; 816 unsigned int i_allocated_meta_blocks; 817 unsigned short i_delalloc_reserved_flag; 818 sector_t i_da_metadata_calc_last_lblock; 819 int i_da_metadata_calc_len; 820 821 /* on-disk additional length */ 822 __u16 i_extra_isize; 823 824 spinlock_t i_block_reservation_lock; 825 #ifdef CONFIG_QUOTA 826 /* quota space reservation, managed internally by quota code */ 827 qsize_t i_reserved_quota; 828 #endif 829 830 /* completed IOs that might need unwritten extents handling */ 831 struct list_head i_completed_io_list; 832 spinlock_t i_completed_io_lock; 833 /* current io_end structure for async DIO write*/ 834 ext4_io_end_t *cur_aio_dio; 835 836 /* 837 * Transactions that contain inode's metadata needed to complete 838 * fsync and fdatasync, respectively. 839 */ 840 tid_t i_sync_tid; 841 tid_t i_datasync_tid; 842 }; 843 844 /* 845 * File system states 846 */ 847 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 848 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 849 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 850 851 /* 852 * Misc. filesystem flags 853 */ 854 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 855 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 856 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 857 858 /* 859 * Mount flags 860 */ 861 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */ 862 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 863 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 864 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 865 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 866 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 867 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 868 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 869 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 870 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 871 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 872 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 873 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 874 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 875 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 876 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 877 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 878 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 879 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 880 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 881 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 882 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 883 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 884 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 885 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */ 886 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 887 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 888 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 889 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 890 891 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt 892 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt 893 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 894 EXT4_MOUNT_##opt) 895 896 #define ext4_set_bit ext2_set_bit 897 #define ext4_set_bit_atomic ext2_set_bit_atomic 898 #define ext4_clear_bit ext2_clear_bit 899 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 900 #define ext4_test_bit ext2_test_bit 901 #define ext4_find_first_zero_bit ext2_find_first_zero_bit 902 #define ext4_find_next_zero_bit ext2_find_next_zero_bit 903 #define ext4_find_next_bit ext2_find_next_bit 904 905 /* 906 * Maximal mount counts between two filesystem checks 907 */ 908 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 909 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 910 911 /* 912 * Behaviour when detecting errors 913 */ 914 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 915 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 916 #define EXT4_ERRORS_PANIC 3 /* Panic */ 917 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 918 919 /* 920 * Structure of the super block 921 */ 922 struct ext4_super_block { 923 /*00*/ __le32 s_inodes_count; /* Inodes count */ 924 __le32 s_blocks_count_lo; /* Blocks count */ 925 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 926 __le32 s_free_blocks_count_lo; /* Free blocks count */ 927 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 928 __le32 s_first_data_block; /* First Data Block */ 929 __le32 s_log_block_size; /* Block size */ 930 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */ 931 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 932 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */ 933 __le32 s_inodes_per_group; /* # Inodes per group */ 934 __le32 s_mtime; /* Mount time */ 935 /*30*/ __le32 s_wtime; /* Write time */ 936 __le16 s_mnt_count; /* Mount count */ 937 __le16 s_max_mnt_count; /* Maximal mount count */ 938 __le16 s_magic; /* Magic signature */ 939 __le16 s_state; /* File system state */ 940 __le16 s_errors; /* Behaviour when detecting errors */ 941 __le16 s_minor_rev_level; /* minor revision level */ 942 /*40*/ __le32 s_lastcheck; /* time of last check */ 943 __le32 s_checkinterval; /* max. time between checks */ 944 __le32 s_creator_os; /* OS */ 945 __le32 s_rev_level; /* Revision level */ 946 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 947 __le16 s_def_resgid; /* Default gid for reserved blocks */ 948 /* 949 * These fields are for EXT4_DYNAMIC_REV superblocks only. 950 * 951 * Note: the difference between the compatible feature set and 952 * the incompatible feature set is that if there is a bit set 953 * in the incompatible feature set that the kernel doesn't 954 * know about, it should refuse to mount the filesystem. 955 * 956 * e2fsck's requirements are more strict; if it doesn't know 957 * about a feature in either the compatible or incompatible 958 * feature set, it must abort and not try to meddle with 959 * things it doesn't understand... 960 */ 961 __le32 s_first_ino; /* First non-reserved inode */ 962 __le16 s_inode_size; /* size of inode structure */ 963 __le16 s_block_group_nr; /* block group # of this superblock */ 964 __le32 s_feature_compat; /* compatible feature set */ 965 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 966 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 967 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 968 /*78*/ char s_volume_name[16]; /* volume name */ 969 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 970 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 971 /* 972 * Performance hints. Directory preallocation should only 973 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 974 */ 975 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 976 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 977 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 978 /* 979 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 980 */ 981 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 982 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 983 __le32 s_journal_dev; /* device number of journal file */ 984 __le32 s_last_orphan; /* start of list of inodes to delete */ 985 __le32 s_hash_seed[4]; /* HTREE hash seed */ 986 __u8 s_def_hash_version; /* Default hash version to use */ 987 __u8 s_reserved_char_pad; 988 __le16 s_desc_size; /* size of group descriptor */ 989 /*100*/ __le32 s_default_mount_opts; 990 __le32 s_first_meta_bg; /* First metablock block group */ 991 __le32 s_mkfs_time; /* When the filesystem was created */ 992 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 993 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 994 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 995 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 996 __le32 s_free_blocks_count_hi; /* Free blocks count */ 997 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 998 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 999 __le32 s_flags; /* Miscellaneous flags */ 1000 __le16 s_raid_stride; /* RAID stride */ 1001 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */ 1002 __le64 s_mmp_block; /* Block for multi-mount protection */ 1003 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1004 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1005 __u8 s_reserved_char_pad2; 1006 __le16 s_reserved_pad; 1007 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1008 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1009 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1010 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1011 snapshot's future use */ 1012 __le32 s_snapshot_list; /* inode number of the head of the 1013 on-disk snapshot list */ 1014 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1015 __le32 s_error_count; /* number of fs errors */ 1016 __le32 s_first_error_time; /* first time an error happened */ 1017 __le32 s_first_error_ino; /* inode involved in first error */ 1018 __le64 s_first_error_block; /* block involved of first error */ 1019 __u8 s_first_error_func[32]; /* function where the error happened */ 1020 __le32 s_first_error_line; /* line number where error happened */ 1021 __le32 s_last_error_time; /* most recent time of an error */ 1022 __le32 s_last_error_ino; /* inode involved in last error */ 1023 __le32 s_last_error_line; /* line number where error happened */ 1024 __le64 s_last_error_block; /* block involved of last error */ 1025 __u8 s_last_error_func[32]; /* function where the error happened */ 1026 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_reserved) 1027 __le32 s_reserved[128]; /* Padding to the end of the block */ 1028 }; 1029 1030 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1031 1032 #ifdef __KERNEL__ 1033 1034 /* 1035 * run-time mount flags 1036 */ 1037 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1038 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1039 1040 /* 1041 * fourth extended-fs super-block data in memory 1042 */ 1043 struct ext4_sb_info { 1044 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1045 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1046 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1047 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1048 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1049 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1050 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1051 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1052 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1053 unsigned long s_overhead_last; /* Last calculated overhead */ 1054 unsigned long s_blocks_last; /* Last seen block count */ 1055 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1056 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1057 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1058 struct buffer_head **s_group_desc; 1059 unsigned int s_mount_opt; 1060 unsigned int s_mount_flags; 1061 ext4_fsblk_t s_sb_block; 1062 uid_t s_resuid; 1063 gid_t s_resgid; 1064 unsigned short s_mount_state; 1065 unsigned short s_pad; 1066 int s_addr_per_block_bits; 1067 int s_desc_per_block_bits; 1068 int s_inode_size; 1069 int s_first_ino; 1070 unsigned int s_inode_readahead_blks; 1071 unsigned int s_inode_goal; 1072 spinlock_t s_next_gen_lock; 1073 u32 s_next_generation; 1074 u32 s_hash_seed[4]; 1075 int s_def_hash_version; 1076 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1077 struct percpu_counter s_freeblocks_counter; 1078 struct percpu_counter s_freeinodes_counter; 1079 struct percpu_counter s_dirs_counter; 1080 struct percpu_counter s_dirtyblocks_counter; 1081 struct blockgroup_lock *s_blockgroup_lock; 1082 struct proc_dir_entry *s_proc; 1083 struct kobject s_kobj; 1084 struct completion s_kobj_unregister; 1085 1086 /* Journaling */ 1087 struct inode *s_journal_inode; 1088 struct journal_s *s_journal; 1089 struct list_head s_orphan; 1090 struct mutex s_orphan_lock; 1091 struct mutex s_resize_lock; 1092 unsigned long s_commit_interval; 1093 u32 s_max_batch_time; 1094 u32 s_min_batch_time; 1095 struct block_device *journal_bdev; 1096 #ifdef CONFIG_JBD2_DEBUG 1097 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */ 1098 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */ 1099 #endif 1100 #ifdef CONFIG_QUOTA 1101 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ 1102 int s_jquota_fmt; /* Format of quota to use */ 1103 #endif 1104 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1105 struct rb_root system_blks; 1106 1107 #ifdef EXTENTS_STATS 1108 /* ext4 extents stats */ 1109 unsigned long s_ext_min; 1110 unsigned long s_ext_max; 1111 unsigned long s_depth_max; 1112 spinlock_t s_ext_stats_lock; 1113 unsigned long s_ext_blocks; 1114 unsigned long s_ext_extents; 1115 #endif 1116 1117 /* for buddy allocator */ 1118 struct ext4_group_info ***s_group_info; 1119 struct inode *s_buddy_cache; 1120 long s_blocks_reserved; 1121 spinlock_t s_reserve_lock; 1122 spinlock_t s_md_lock; 1123 tid_t s_last_transaction; 1124 unsigned short *s_mb_offsets; 1125 unsigned int *s_mb_maxs; 1126 1127 /* tunables */ 1128 unsigned long s_stripe; 1129 unsigned int s_mb_stream_request; 1130 unsigned int s_mb_max_to_scan; 1131 unsigned int s_mb_min_to_scan; 1132 unsigned int s_mb_stats; 1133 unsigned int s_mb_order2_reqs; 1134 unsigned int s_mb_group_prealloc; 1135 unsigned int s_max_writeback_mb_bump; 1136 /* where last allocation was done - for stream allocation */ 1137 unsigned long s_mb_last_group; 1138 unsigned long s_mb_last_start; 1139 1140 /* stats for buddy allocator */ 1141 spinlock_t s_mb_pa_lock; 1142 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1143 atomic_t s_bal_success; /* we found long enough chunks */ 1144 atomic_t s_bal_allocated; /* in blocks */ 1145 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1146 atomic_t s_bal_goals; /* goal hits */ 1147 atomic_t s_bal_breaks; /* too long searches */ 1148 atomic_t s_bal_2orders; /* 2^order hits */ 1149 spinlock_t s_bal_lock; 1150 unsigned long s_mb_buddies_generated; 1151 unsigned long long s_mb_generation_time; 1152 atomic_t s_mb_lost_chunks; 1153 atomic_t s_mb_preallocated; 1154 atomic_t s_mb_discarded; 1155 atomic_t s_lock_busy; 1156 1157 /* locality groups */ 1158 struct ext4_locality_group __percpu *s_locality_groups; 1159 1160 /* for write statistics */ 1161 unsigned long s_sectors_written_start; 1162 u64 s_kbytes_written; 1163 1164 unsigned int s_log_groups_per_flex; 1165 struct flex_groups *s_flex_groups; 1166 1167 /* workqueue for dio unwritten */ 1168 struct workqueue_struct *dio_unwritten_wq; 1169 1170 /* timer for periodic error stats printing */ 1171 struct timer_list s_err_report; 1172 }; 1173 1174 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1175 { 1176 return sb->s_fs_info; 1177 } 1178 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1179 { 1180 return container_of(inode, struct ext4_inode_info, vfs_inode); 1181 } 1182 1183 static inline struct timespec ext4_current_time(struct inode *inode) 1184 { 1185 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1186 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1187 } 1188 1189 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1190 { 1191 return ino == EXT4_ROOT_INO || 1192 ino == EXT4_JOURNAL_INO || 1193 ino == EXT4_RESIZE_INO || 1194 (ino >= EXT4_FIRST_INO(sb) && 1195 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1196 } 1197 1198 /* 1199 * Inode dynamic state flags 1200 */ 1201 enum { 1202 EXT4_STATE_JDATA, /* journaled data exists */ 1203 EXT4_STATE_NEW, /* inode is newly created */ 1204 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1205 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1206 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1207 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1208 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1209 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1210 }; 1211 1212 #define EXT4_INODE_BIT_FNS(name, field) \ 1213 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1214 { \ 1215 return test_bit(bit, &EXT4_I(inode)->i_##field); \ 1216 } \ 1217 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1218 { \ 1219 set_bit(bit, &EXT4_I(inode)->i_##field); \ 1220 } \ 1221 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1222 { \ 1223 clear_bit(bit, &EXT4_I(inode)->i_##field); \ 1224 } 1225 1226 EXT4_INODE_BIT_FNS(flag, flags) 1227 EXT4_INODE_BIT_FNS(state, state_flags) 1228 #else 1229 /* Assume that user mode programs are passing in an ext4fs superblock, not 1230 * a kernel struct super_block. This will allow us to call the feature-test 1231 * macros from user land. */ 1232 #define EXT4_SB(sb) (sb) 1233 #endif 1234 1235 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1236 1237 /* 1238 * Codes for operating systems 1239 */ 1240 #define EXT4_OS_LINUX 0 1241 #define EXT4_OS_HURD 1 1242 #define EXT4_OS_MASIX 2 1243 #define EXT4_OS_FREEBSD 3 1244 #define EXT4_OS_LITES 4 1245 1246 /* 1247 * Revision levels 1248 */ 1249 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1250 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1251 1252 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1253 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1254 1255 #define EXT4_GOOD_OLD_INODE_SIZE 128 1256 1257 /* 1258 * Feature set definitions 1259 */ 1260 1261 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1262 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1263 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1264 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1265 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1266 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1267 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1268 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1269 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1270 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1271 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1272 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1273 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1274 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1275 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1276 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1277 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1278 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1279 1280 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1281 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1282 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1283 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1284 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1285 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1286 1287 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1288 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1289 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1290 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1291 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1292 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1293 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1294 1295 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1296 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1297 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1298 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1299 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1300 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1301 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1302 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1303 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1304 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1305 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1306 1307 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 1308 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1309 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1310 EXT4_FEATURE_INCOMPAT_META_BG| \ 1311 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1312 EXT4_FEATURE_INCOMPAT_64BIT| \ 1313 EXT4_FEATURE_INCOMPAT_FLEX_BG) 1314 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1315 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1316 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1317 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1318 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1319 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1320 EXT4_FEATURE_RO_COMPAT_HUGE_FILE) 1321 1322 /* 1323 * Default values for user and/or group using reserved blocks 1324 */ 1325 #define EXT4_DEF_RESUID 0 1326 #define EXT4_DEF_RESGID 0 1327 1328 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1329 1330 /* 1331 * Default mount options 1332 */ 1333 #define EXT4_DEFM_DEBUG 0x0001 1334 #define EXT4_DEFM_BSDGROUPS 0x0002 1335 #define EXT4_DEFM_XATTR_USER 0x0004 1336 #define EXT4_DEFM_ACL 0x0008 1337 #define EXT4_DEFM_UID16 0x0010 1338 #define EXT4_DEFM_JMODE 0x0060 1339 #define EXT4_DEFM_JMODE_DATA 0x0020 1340 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1341 #define EXT4_DEFM_JMODE_WBACK 0x0060 1342 1343 /* 1344 * Default journal batch times 1345 */ 1346 #define EXT4_DEF_MIN_BATCH_TIME 0 1347 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1348 1349 /* 1350 * Minimum number of groups in a flexgroup before we separate out 1351 * directories into the first block group of a flexgroup 1352 */ 1353 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1354 1355 /* 1356 * Structure of a directory entry 1357 */ 1358 #define EXT4_NAME_LEN 255 1359 1360 struct ext4_dir_entry { 1361 __le32 inode; /* Inode number */ 1362 __le16 rec_len; /* Directory entry length */ 1363 __le16 name_len; /* Name length */ 1364 char name[EXT4_NAME_LEN]; /* File name */ 1365 }; 1366 1367 /* 1368 * The new version of the directory entry. Since EXT4 structures are 1369 * stored in intel byte order, and the name_len field could never be 1370 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1371 * file_type field. 1372 */ 1373 struct ext4_dir_entry_2 { 1374 __le32 inode; /* Inode number */ 1375 __le16 rec_len; /* Directory entry length */ 1376 __u8 name_len; /* Name length */ 1377 __u8 file_type; 1378 char name[EXT4_NAME_LEN]; /* File name */ 1379 }; 1380 1381 /* 1382 * Ext4 directory file types. Only the low 3 bits are used. The 1383 * other bits are reserved for now. 1384 */ 1385 #define EXT4_FT_UNKNOWN 0 1386 #define EXT4_FT_REG_FILE 1 1387 #define EXT4_FT_DIR 2 1388 #define EXT4_FT_CHRDEV 3 1389 #define EXT4_FT_BLKDEV 4 1390 #define EXT4_FT_FIFO 5 1391 #define EXT4_FT_SOCK 6 1392 #define EXT4_FT_SYMLINK 7 1393 1394 #define EXT4_FT_MAX 8 1395 1396 /* 1397 * EXT4_DIR_PAD defines the directory entries boundaries 1398 * 1399 * NOTE: It must be a multiple of 4 1400 */ 1401 #define EXT4_DIR_PAD 4 1402 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1403 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1404 ~EXT4_DIR_ROUND) 1405 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1406 1407 /* 1408 * Hash Tree Directory indexing 1409 * (c) Daniel Phillips, 2001 1410 */ 1411 1412 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 1413 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 1414 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 1415 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 1416 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 1417 1418 /* Legal values for the dx_root hash_version field: */ 1419 1420 #define DX_HASH_LEGACY 0 1421 #define DX_HASH_HALF_MD4 1 1422 #define DX_HASH_TEA 2 1423 #define DX_HASH_LEGACY_UNSIGNED 3 1424 #define DX_HASH_HALF_MD4_UNSIGNED 4 1425 #define DX_HASH_TEA_UNSIGNED 5 1426 1427 #ifdef __KERNEL__ 1428 1429 /* hash info structure used by the directory hash */ 1430 struct dx_hash_info 1431 { 1432 u32 hash; 1433 u32 minor_hash; 1434 int hash_version; 1435 u32 *seed; 1436 }; 1437 1438 #define EXT4_HTREE_EOF 0x7fffffff 1439 1440 /* 1441 * Control parameters used by ext4_htree_next_block 1442 */ 1443 #define HASH_NB_ALWAYS 1 1444 1445 1446 /* 1447 * Describe an inode's exact location on disk and in memory 1448 */ 1449 struct ext4_iloc 1450 { 1451 struct buffer_head *bh; 1452 unsigned long offset; 1453 ext4_group_t block_group; 1454 }; 1455 1456 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 1457 { 1458 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 1459 } 1460 1461 /* 1462 * This structure is stuffed into the struct file's private_data field 1463 * for directories. It is where we put information so that we can do 1464 * readdir operations in hash tree order. 1465 */ 1466 struct dir_private_info { 1467 struct rb_root root; 1468 struct rb_node *curr_node; 1469 struct fname *extra_fname; 1470 loff_t last_pos; 1471 __u32 curr_hash; 1472 __u32 curr_minor_hash; 1473 __u32 next_hash; 1474 }; 1475 1476 /* calculate the first block number of the group */ 1477 static inline ext4_fsblk_t 1478 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 1479 { 1480 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 1481 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 1482 } 1483 1484 /* 1485 * Special error return code only used by dx_probe() and its callers. 1486 */ 1487 #define ERR_BAD_DX_DIR -75000 1488 1489 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, 1490 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); 1491 1492 extern struct proc_dir_entry *ext4_proc_root; 1493 1494 /* 1495 * Function prototypes 1496 */ 1497 1498 /* 1499 * Ok, these declarations are also in <linux/kernel.h> but none of the 1500 * ext4 source programs needs to include it so they are duplicated here. 1501 */ 1502 # define NORET_TYPE /**/ 1503 # define ATTRIB_NORET __attribute__((noreturn)) 1504 # define NORET_AND noreturn, 1505 1506 /* bitmap.c */ 1507 extern unsigned int ext4_count_free(struct buffer_head *, unsigned); 1508 1509 /* balloc.c */ 1510 extern unsigned int ext4_block_group(struct super_block *sb, 1511 ext4_fsblk_t blocknr); 1512 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 1513 ext4_fsblk_t blocknr); 1514 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 1515 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 1516 ext4_group_t group); 1517 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 1518 ext4_fsblk_t goal, unsigned long *count, int *errp); 1519 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); 1520 extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); 1521 extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb, 1522 ext4_fsblk_t block, unsigned long count); 1523 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *); 1524 extern void ext4_check_blocks_bitmap(struct super_block *); 1525 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 1526 ext4_group_t block_group, 1527 struct buffer_head ** bh); 1528 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1529 struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 1530 ext4_group_t block_group); 1531 extern unsigned ext4_init_block_bitmap(struct super_block *sb, 1532 struct buffer_head *bh, 1533 ext4_group_t group, 1534 struct ext4_group_desc *desc); 1535 #define ext4_free_blocks_after_init(sb, group, desc) \ 1536 ext4_init_block_bitmap(sb, NULL, group, desc) 1537 1538 /* dir.c */ 1539 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 1540 struct ext4_dir_entry_2 *, 1541 struct buffer_head *, unsigned int); 1542 #define ext4_check_dir_entry(dir, de, bh, offset) \ 1543 __ext4_check_dir_entry(__func__, __LINE__, (dir), (de), (bh), (offset)) 1544 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 1545 __u32 minor_hash, 1546 struct ext4_dir_entry_2 *dirent); 1547 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 1548 1549 /* fsync.c */ 1550 extern int ext4_sync_file(struct file *, int); 1551 1552 /* hash.c */ 1553 extern int ext4fs_dirhash(const char *name, int len, struct 1554 dx_hash_info *hinfo); 1555 1556 /* ialloc.c */ 1557 extern struct inode *ext4_new_inode(handle_t *, struct inode *, int, 1558 const struct qstr *qstr, __u32 goal); 1559 extern void ext4_free_inode(handle_t *, struct inode *); 1560 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 1561 extern unsigned long ext4_count_free_inodes(struct super_block *); 1562 extern unsigned long ext4_count_dirs(struct super_block *); 1563 extern void ext4_check_inodes_bitmap(struct super_block *); 1564 extern unsigned ext4_init_inode_bitmap(struct super_block *sb, 1565 struct buffer_head *bh, 1566 ext4_group_t group, 1567 struct ext4_group_desc *desc); 1568 extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 1569 1570 /* mballoc.c */ 1571 extern long ext4_mb_stats; 1572 extern long ext4_mb_max_to_scan; 1573 extern int ext4_mb_init(struct super_block *, int); 1574 extern int ext4_mb_release(struct super_block *); 1575 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 1576 struct ext4_allocation_request *, int *); 1577 extern int ext4_mb_reserve_blocks(struct super_block *, int); 1578 extern void ext4_discard_preallocations(struct inode *); 1579 extern int __init init_ext4_mballoc(void); 1580 extern void exit_ext4_mballoc(void); 1581 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 1582 struct buffer_head *bh, ext4_fsblk_t block, 1583 unsigned long count, int flags); 1584 extern int ext4_mb_add_groupinfo(struct super_block *sb, 1585 ext4_group_t i, struct ext4_group_desc *desc); 1586 extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t); 1587 extern void ext4_mb_put_buddy_cache_lock(struct super_block *, 1588 ext4_group_t, int); 1589 /* inode.c */ 1590 struct buffer_head *ext4_getblk(handle_t *, struct inode *, 1591 ext4_lblk_t, int, int *); 1592 struct buffer_head *ext4_bread(handle_t *, struct inode *, 1593 ext4_lblk_t, int, int *); 1594 int ext4_get_block(struct inode *inode, sector_t iblock, 1595 struct buffer_head *bh_result, int create); 1596 1597 extern struct inode *ext4_iget(struct super_block *, unsigned long); 1598 extern int ext4_write_inode(struct inode *, struct writeback_control *); 1599 extern int ext4_setattr(struct dentry *, struct iattr *); 1600 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 1601 struct kstat *stat); 1602 extern void ext4_delete_inode(struct inode *); 1603 extern int ext4_sync_inode(handle_t *, struct inode *); 1604 extern void ext4_dirty_inode(struct inode *); 1605 extern int ext4_change_inode_journal_flag(struct inode *, int); 1606 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 1607 extern int ext4_can_truncate(struct inode *inode); 1608 extern void ext4_truncate(struct inode *); 1609 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 1610 extern void ext4_set_inode_flags(struct inode *); 1611 extern void ext4_get_inode_flags(struct ext4_inode_info *); 1612 extern int ext4_alloc_da_blocks(struct inode *inode); 1613 extern void ext4_set_aops(struct inode *inode); 1614 extern int ext4_writepage_trans_blocks(struct inode *); 1615 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks); 1616 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 1617 extern int ext4_block_truncate_page(handle_t *handle, 1618 struct address_space *mapping, loff_t from); 1619 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 1620 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 1621 extern int flush_completed_IO(struct inode *inode); 1622 extern void ext4_da_update_reserve_space(struct inode *inode, 1623 int used, int quota_claim); 1624 /* ioctl.c */ 1625 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 1626 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 1627 1628 /* migrate.c */ 1629 extern int ext4_ext_migrate(struct inode *); 1630 1631 /* namei.c */ 1632 extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize); 1633 extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize); 1634 extern int ext4_orphan_add(handle_t *, struct inode *); 1635 extern int ext4_orphan_del(handle_t *, struct inode *); 1636 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 1637 __u32 start_minor_hash, __u32 *next_hash); 1638 1639 /* resize.c */ 1640 extern int ext4_group_add(struct super_block *sb, 1641 struct ext4_new_group_data *input); 1642 extern int ext4_group_extend(struct super_block *sb, 1643 struct ext4_super_block *es, 1644 ext4_fsblk_t n_blocks_count); 1645 1646 /* super.c */ 1647 extern void __ext4_error(struct super_block *, const char *, unsigned int, 1648 const char *, ...) 1649 __attribute__ ((format (printf, 4, 5))); 1650 #define ext4_error(sb, message...) __ext4_error(sb, __func__, \ 1651 __LINE__, ## message) 1652 extern void ext4_error_inode(struct inode *, const char *, unsigned int, 1653 ext4_fsblk_t, const char *, ...) 1654 __attribute__ ((format (printf, 5, 6))); 1655 extern void ext4_error_file(struct file *, const char *, unsigned int, 1656 const char *, ...) 1657 __attribute__ ((format (printf, 4, 5))); 1658 extern void __ext4_std_error(struct super_block *, const char *, 1659 unsigned int, int); 1660 extern void __ext4_abort(struct super_block *, const char *, unsigned int, 1661 const char *, ...) 1662 __attribute__ ((format (printf, 4, 5))); 1663 #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \ 1664 __LINE__, ## message) 1665 extern void __ext4_warning(struct super_block *, const char *, unsigned int, 1666 const char *, ...) 1667 __attribute__ ((format (printf, 4, 5))); 1668 #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \ 1669 __LINE__, ## message) 1670 extern void ext4_msg(struct super_block *, const char *, const char *, ...) 1671 __attribute__ ((format (printf, 3, 4))); 1672 extern void __ext4_grp_locked_error(const char *, unsigned int, \ 1673 struct super_block *, ext4_group_t, \ 1674 unsigned long, ext4_fsblk_t, \ 1675 const char *, ...) 1676 __attribute__ ((format (printf, 7, 8))); 1677 #define ext4_grp_locked_error(sb, grp, message...) \ 1678 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message) 1679 extern void ext4_update_dynamic_rev(struct super_block *sb); 1680 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 1681 __u32 compat); 1682 extern int ext4_update_rocompat_feature(handle_t *handle, 1683 struct super_block *sb, __u32 rocompat); 1684 extern int ext4_update_incompat_feature(handle_t *handle, 1685 struct super_block *sb, __u32 incompat); 1686 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 1687 struct ext4_group_desc *bg); 1688 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 1689 struct ext4_group_desc *bg); 1690 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 1691 struct ext4_group_desc *bg); 1692 extern __u32 ext4_free_blks_count(struct super_block *sb, 1693 struct ext4_group_desc *bg); 1694 extern __u32 ext4_free_inodes_count(struct super_block *sb, 1695 struct ext4_group_desc *bg); 1696 extern __u32 ext4_used_dirs_count(struct super_block *sb, 1697 struct ext4_group_desc *bg); 1698 extern __u32 ext4_itable_unused_count(struct super_block *sb, 1699 struct ext4_group_desc *bg); 1700 extern void ext4_block_bitmap_set(struct super_block *sb, 1701 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1702 extern void ext4_inode_bitmap_set(struct super_block *sb, 1703 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1704 extern void ext4_inode_table_set(struct super_block *sb, 1705 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1706 extern void ext4_free_blks_set(struct super_block *sb, 1707 struct ext4_group_desc *bg, __u32 count); 1708 extern void ext4_free_inodes_set(struct super_block *sb, 1709 struct ext4_group_desc *bg, __u32 count); 1710 extern void ext4_used_dirs_set(struct super_block *sb, 1711 struct ext4_group_desc *bg, __u32 count); 1712 extern void ext4_itable_unused_set(struct super_block *sb, 1713 struct ext4_group_desc *bg, __u32 count); 1714 extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group, 1715 struct ext4_group_desc *gdp); 1716 extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group, 1717 struct ext4_group_desc *gdp); 1718 1719 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 1720 { 1721 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 1722 le32_to_cpu(es->s_blocks_count_lo); 1723 } 1724 1725 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 1726 { 1727 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 1728 le32_to_cpu(es->s_r_blocks_count_lo); 1729 } 1730 1731 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 1732 { 1733 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 1734 le32_to_cpu(es->s_free_blocks_count_lo); 1735 } 1736 1737 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 1738 ext4_fsblk_t blk) 1739 { 1740 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 1741 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 1742 } 1743 1744 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 1745 ext4_fsblk_t blk) 1746 { 1747 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 1748 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 1749 } 1750 1751 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 1752 ext4_fsblk_t blk) 1753 { 1754 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 1755 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 1756 } 1757 1758 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 1759 { 1760 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 1761 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 1762 le32_to_cpu(raw_inode->i_size_lo); 1763 else 1764 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 1765 } 1766 1767 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 1768 { 1769 raw_inode->i_size_lo = cpu_to_le32(i_size); 1770 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 1771 } 1772 1773 static inline 1774 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 1775 ext4_group_t group) 1776 { 1777 struct ext4_group_info ***grp_info; 1778 long indexv, indexh; 1779 grp_info = EXT4_SB(sb)->s_group_info; 1780 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 1781 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 1782 return grp_info[indexv][indexh]; 1783 } 1784 1785 /* 1786 * Reading s_groups_count requires using smp_rmb() afterwards. See 1787 * the locking protocol documented in the comments of ext4_group_add() 1788 * in resize.c 1789 */ 1790 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 1791 { 1792 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 1793 1794 smp_rmb(); 1795 return ngroups; 1796 } 1797 1798 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 1799 ext4_group_t block_group) 1800 { 1801 return block_group >> sbi->s_log_groups_per_flex; 1802 } 1803 1804 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 1805 { 1806 return 1 << sbi->s_log_groups_per_flex; 1807 } 1808 1809 #define ext4_std_error(sb, errno) \ 1810 do { \ 1811 if ((errno)) \ 1812 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 1813 } while (0) 1814 1815 #ifdef CONFIG_SMP 1816 /* Each CPU can accumulate percpu_counter_batch blocks in their local 1817 * counters. So we need to make sure we have free blocks more 1818 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 1819 */ 1820 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 1821 #else 1822 #define EXT4_FREEBLOCKS_WATERMARK 0 1823 #endif 1824 1825 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 1826 { 1827 /* 1828 * XXX: replace with spinlock if seen contended -bzzz 1829 */ 1830 down_write(&EXT4_I(inode)->i_data_sem); 1831 if (newsize > EXT4_I(inode)->i_disksize) 1832 EXT4_I(inode)->i_disksize = newsize; 1833 up_write(&EXT4_I(inode)->i_data_sem); 1834 return ; 1835 } 1836 1837 struct ext4_group_info { 1838 unsigned long bb_state; 1839 struct rb_root bb_free_root; 1840 ext4_grpblk_t bb_first_free; /* first free block */ 1841 ext4_grpblk_t bb_free; /* total free blocks */ 1842 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 1843 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 1844 struct list_head bb_prealloc_list; 1845 #ifdef DOUBLE_CHECK 1846 void *bb_bitmap; 1847 #endif 1848 struct rw_semaphore alloc_sem; 1849 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 1850 * regions, index is order. 1851 * bb_counters[3] = 5 means 1852 * 5 free 8-block regions. */ 1853 }; 1854 1855 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 1856 1857 #define EXT4_MB_GRP_NEED_INIT(grp) \ 1858 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 1859 1860 #define EXT4_MAX_CONTENTION 8 1861 #define EXT4_CONTENTION_THRESHOLD 2 1862 1863 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 1864 ext4_group_t group) 1865 { 1866 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 1867 } 1868 1869 /* 1870 * Returns true if the filesystem is busy enough that attempts to 1871 * access the block group locks has run into contention. 1872 */ 1873 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 1874 { 1875 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 1876 } 1877 1878 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 1879 { 1880 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 1881 if (spin_trylock(lock)) 1882 /* 1883 * We're able to grab the lock right away, so drop the 1884 * lock contention counter. 1885 */ 1886 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 1887 else { 1888 /* 1889 * The lock is busy, so bump the contention counter, 1890 * and then wait on the spin lock. 1891 */ 1892 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 1893 EXT4_MAX_CONTENTION); 1894 spin_lock(lock); 1895 } 1896 } 1897 1898 static inline void ext4_unlock_group(struct super_block *sb, 1899 ext4_group_t group) 1900 { 1901 spin_unlock(ext4_group_lock_ptr(sb, group)); 1902 } 1903 1904 static inline void ext4_mark_super_dirty(struct super_block *sb) 1905 { 1906 if (EXT4_SB(sb)->s_journal == NULL) 1907 sb->s_dirt =1; 1908 } 1909 1910 /* 1911 * Inodes and files operations 1912 */ 1913 1914 /* dir.c */ 1915 extern const struct file_operations ext4_dir_operations; 1916 1917 /* file.c */ 1918 extern const struct inode_operations ext4_file_inode_operations; 1919 extern const struct file_operations ext4_file_operations; 1920 1921 /* namei.c */ 1922 extern const struct inode_operations ext4_dir_inode_operations; 1923 extern const struct inode_operations ext4_special_inode_operations; 1924 extern struct dentry *ext4_get_parent(struct dentry *child); 1925 1926 /* symlink.c */ 1927 extern const struct inode_operations ext4_symlink_inode_operations; 1928 extern const struct inode_operations ext4_fast_symlink_inode_operations; 1929 1930 /* block_validity */ 1931 extern void ext4_release_system_zone(struct super_block *sb); 1932 extern int ext4_setup_system_zone(struct super_block *sb); 1933 extern int __init init_ext4_system_zone(void); 1934 extern void exit_ext4_system_zone(void); 1935 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 1936 ext4_fsblk_t start_blk, 1937 unsigned int count); 1938 1939 /* extents.c */ 1940 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 1941 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 1942 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, 1943 int chunk); 1944 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 1945 struct ext4_map_blocks *map, int flags); 1946 extern void ext4_ext_truncate(struct inode *); 1947 extern void ext4_ext_init(struct super_block *); 1948 extern void ext4_ext_release(struct super_block *); 1949 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset, 1950 loff_t len); 1951 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset, 1952 ssize_t len); 1953 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 1954 struct ext4_map_blocks *map, int flags); 1955 extern int ext4_get_blocks(handle_t *handle, struct inode *inode, 1956 sector_t block, unsigned int max_blocks, 1957 struct buffer_head *bh, int flags); 1958 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1959 __u64 start, __u64 len); 1960 /* move_extent.c */ 1961 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 1962 __u64 start_orig, __u64 start_donor, 1963 __u64 len, __u64 *moved_len); 1964 1965 1966 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */ 1967 enum ext4_state_bits { 1968 BH_Uninit /* blocks are allocated but uninitialized on disk */ 1969 = BH_JBDPrivateStart, 1970 }; 1971 1972 BUFFER_FNS(Uninit, uninit) 1973 TAS_BUFFER_FNS(Uninit, uninit) 1974 1975 /* 1976 * Add new method to test wether block and inode bitmaps are properly 1977 * initialized. With uninit_bg reading the block from disk is not enough 1978 * to mark the bitmap uptodate. We need to also zero-out the bitmap 1979 */ 1980 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 1981 1982 static inline int bitmap_uptodate(struct buffer_head *bh) 1983 { 1984 return (buffer_uptodate(bh) && 1985 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 1986 } 1987 static inline void set_bitmap_uptodate(struct buffer_head *bh) 1988 { 1989 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 1990 } 1991 1992 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 1993 1994 #endif /* __KERNEL__ */ 1995 1996 #endif /* _EXT4_H */ 1997