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 IO 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 struct kiocb *iocb; /* iocb struct for AIO */ 181 int result; /* error value for AIO */ 182 } ext4_io_end_t; 183 184 /* 185 * Special inodes numbers 186 */ 187 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 188 #define EXT4_ROOT_INO 2 /* Root inode */ 189 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 190 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 191 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 192 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 193 194 /* First non-reserved inode for old ext4 filesystems */ 195 #define EXT4_GOOD_OLD_FIRST_INO 11 196 197 /* 198 * Maximal count of links to a file 199 */ 200 #define EXT4_LINK_MAX 65000 201 202 /* 203 * Macro-instructions used to manage several block sizes 204 */ 205 #define EXT4_MIN_BLOCK_SIZE 1024 206 #define EXT4_MAX_BLOCK_SIZE 65536 207 #define EXT4_MIN_BLOCK_LOG_SIZE 10 208 #define EXT4_MAX_BLOCK_LOG_SIZE 16 209 #ifdef __KERNEL__ 210 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 211 #else 212 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 213 #endif 214 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 215 #ifdef __KERNEL__ 216 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 217 #else 218 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 219 #endif 220 #ifdef __KERNEL__ 221 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 222 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 223 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 224 #else 225 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 226 EXT4_GOOD_OLD_INODE_SIZE : \ 227 (s)->s_inode_size) 228 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 229 EXT4_GOOD_OLD_FIRST_INO : \ 230 (s)->s_first_ino) 231 #endif 232 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 233 234 /* 235 * Structure of a blocks group descriptor 236 */ 237 struct ext4_group_desc 238 { 239 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 240 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 241 __le32 bg_inode_table_lo; /* Inodes table block */ 242 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 243 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 244 __le16 bg_used_dirs_count_lo; /* Directories count */ 245 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 246 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ 247 __le16 bg_itable_unused_lo; /* Unused inodes count */ 248 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 249 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 250 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 251 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 252 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 253 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 254 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 255 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 256 __u32 bg_reserved2[3]; 257 }; 258 259 /* 260 * Structure of a flex block group info 261 */ 262 263 struct flex_groups { 264 atomic_t free_inodes; 265 atomic_t free_blocks; 266 atomic_t used_dirs; 267 }; 268 269 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 270 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 271 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 272 273 /* 274 * Macro-instructions used to manage group descriptors 275 */ 276 #define EXT4_MIN_DESC_SIZE 32 277 #define EXT4_MIN_DESC_SIZE_64BIT 64 278 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 279 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 280 #ifdef __KERNEL__ 281 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 282 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 283 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 284 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 285 #else 286 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 287 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 288 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 289 #endif 290 291 /* 292 * Constants relative to the data blocks 293 */ 294 #define EXT4_NDIR_BLOCKS 12 295 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 296 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 297 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 298 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 299 300 /* 301 * Inode flags 302 */ 303 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 304 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 305 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 306 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 307 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 308 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 309 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 310 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 311 /* Reserved for compression usage... */ 312 #define EXT4_DIRTY_FL 0x00000100 313 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 314 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 315 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 316 /* End compression flags --- maybe not all used */ 317 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 318 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 319 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 320 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 321 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 322 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 323 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 324 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 325 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 326 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 327 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 328 329 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 330 #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ 331 332 /* Flags that should be inherited by new inodes from their parent. */ 333 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 334 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\ 335 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 336 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 337 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 338 339 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 340 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 341 342 /* Flags that are appropriate for non-directories/regular files. */ 343 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 344 345 /* Mask out flags that are inappropriate for the given type of inode. */ 346 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 347 { 348 if (S_ISDIR(mode)) 349 return flags; 350 else if (S_ISREG(mode)) 351 return flags & EXT4_REG_FLMASK; 352 else 353 return flags & EXT4_OTHER_FLMASK; 354 } 355 356 /* 357 * Inode flags used for atomic set/get 358 */ 359 enum { 360 EXT4_INODE_SECRM = 0, /* Secure deletion */ 361 EXT4_INODE_UNRM = 1, /* Undelete */ 362 EXT4_INODE_COMPR = 2, /* Compress file */ 363 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 364 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 365 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 366 EXT4_INODE_NODUMP = 6, /* do not dump file */ 367 EXT4_INODE_NOATIME = 7, /* do not update atime */ 368 /* Reserved for compression usage... */ 369 EXT4_INODE_DIRTY = 8, 370 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 371 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 372 EXT4_INODE_ECOMPR = 11, /* Compression error */ 373 /* End compression flags --- maybe not all used */ 374 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 375 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 376 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 377 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 378 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 379 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 380 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 381 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 382 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 383 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 384 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 385 }; 386 387 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 388 #define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \ 389 printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \ 390 EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); } 391 392 /* 393 * Since it's pretty easy to mix up bit numbers and hex values, and we 394 * can't do a compile-time test for ENUM values, we use a run-time 395 * test to make sure that EXT4_XXX_FL is consistent with respect to 396 * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop 397 * out so it won't cost any extra space in the compiled kernel image. 398 * But it's important that these values are the same, since we are 399 * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL 400 * must be consistent with the values of FS_XXX_FL defined in 401 * include/linux/fs.h and the on-disk values found in ext2, ext3, and 402 * ext4 filesystems, and of course the values defined in e2fsprogs. 403 * 404 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 405 */ 406 static inline void ext4_check_flag_values(void) 407 { 408 CHECK_FLAG_VALUE(SECRM); 409 CHECK_FLAG_VALUE(UNRM); 410 CHECK_FLAG_VALUE(COMPR); 411 CHECK_FLAG_VALUE(SYNC); 412 CHECK_FLAG_VALUE(IMMUTABLE); 413 CHECK_FLAG_VALUE(APPEND); 414 CHECK_FLAG_VALUE(NODUMP); 415 CHECK_FLAG_VALUE(NOATIME); 416 CHECK_FLAG_VALUE(DIRTY); 417 CHECK_FLAG_VALUE(COMPRBLK); 418 CHECK_FLAG_VALUE(NOCOMPR); 419 CHECK_FLAG_VALUE(ECOMPR); 420 CHECK_FLAG_VALUE(INDEX); 421 CHECK_FLAG_VALUE(IMAGIC); 422 CHECK_FLAG_VALUE(JOURNAL_DATA); 423 CHECK_FLAG_VALUE(NOTAIL); 424 CHECK_FLAG_VALUE(DIRSYNC); 425 CHECK_FLAG_VALUE(TOPDIR); 426 CHECK_FLAG_VALUE(HUGE_FILE); 427 CHECK_FLAG_VALUE(EXTENTS); 428 CHECK_FLAG_VALUE(EA_INODE); 429 CHECK_FLAG_VALUE(EOFBLOCKS); 430 CHECK_FLAG_VALUE(RESERVED); 431 } 432 433 /* Used to pass group descriptor data when online resize is done */ 434 struct ext4_new_group_input { 435 __u32 group; /* Group number for this data */ 436 __u64 block_bitmap; /* Absolute block number of block bitmap */ 437 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 438 __u64 inode_table; /* Absolute block number of inode table start */ 439 __u32 blocks_count; /* Total number of blocks in this group */ 440 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 441 __u16 unused; 442 }; 443 444 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 445 struct compat_ext4_new_group_input { 446 u32 group; 447 compat_u64 block_bitmap; 448 compat_u64 inode_bitmap; 449 compat_u64 inode_table; 450 u32 blocks_count; 451 u16 reserved_blocks; 452 u16 unused; 453 }; 454 #endif 455 456 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 457 struct ext4_new_group_data { 458 __u32 group; 459 __u64 block_bitmap; 460 __u64 inode_bitmap; 461 __u64 inode_table; 462 __u32 blocks_count; 463 __u16 reserved_blocks; 464 __u16 unused; 465 __u32 free_blocks_count; 466 }; 467 468 /* 469 * Flags used by ext4_map_blocks() 470 */ 471 /* Allocate any needed blocks and/or convert an unitialized 472 extent to be an initialized ext4 */ 473 #define EXT4_GET_BLOCKS_CREATE 0x0001 474 /* Request the creation of an unitialized extent */ 475 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 476 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ 477 EXT4_GET_BLOCKS_CREATE) 478 /* Caller is from the delayed allocation writeout path, 479 so set the magic i_delalloc_reserve_flag after taking the 480 inode allocation semaphore for */ 481 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 482 /* caller is from the direct IO path, request to creation of an 483 unitialized extents if not allocated, split the uninitialized 484 extent if blocks has been preallocated already*/ 485 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 486 #define EXT4_GET_BLOCKS_CONVERT 0x0010 487 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 488 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 489 /* Convert extent to initialized after IO complete */ 490 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 491 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 492 493 /* 494 * Flags used by ext4_free_blocks 495 */ 496 #define EXT4_FREE_BLOCKS_METADATA 0x0001 497 #define EXT4_FREE_BLOCKS_FORGET 0x0002 498 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 499 500 /* 501 * ioctl commands 502 */ 503 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 504 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 505 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 506 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 507 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 508 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 509 #ifdef CONFIG_JBD2_DEBUG 510 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long) 511 #endif 512 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 513 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 514 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 515 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 516 #define EXT4_IOC_MIGRATE _IO('f', 9) 517 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 518 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 519 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 520 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 521 522 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 523 /* 524 * ioctl commands in 32 bit emulation 525 */ 526 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 527 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 528 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 529 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 530 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 531 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 532 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 533 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 534 #ifdef CONFIG_JBD2_DEBUG 535 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int) 536 #endif 537 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 538 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 539 #endif 540 541 542 /* 543 * Mount options 544 */ 545 struct ext4_mount_options { 546 unsigned long s_mount_opt; 547 uid_t s_resuid; 548 gid_t s_resgid; 549 unsigned long s_commit_interval; 550 u32 s_min_batch_time, s_max_batch_time; 551 #ifdef CONFIG_QUOTA 552 int s_jquota_fmt; 553 char *s_qf_names[MAXQUOTAS]; 554 #endif 555 }; 556 557 /* Max physical block we can addres w/o extents */ 558 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 559 560 /* 561 * Structure of an inode on the disk 562 */ 563 struct ext4_inode { 564 __le16 i_mode; /* File mode */ 565 __le16 i_uid; /* Low 16 bits of Owner Uid */ 566 __le32 i_size_lo; /* Size in bytes */ 567 __le32 i_atime; /* Access time */ 568 __le32 i_ctime; /* Inode Change time */ 569 __le32 i_mtime; /* Modification time */ 570 __le32 i_dtime; /* Deletion Time */ 571 __le16 i_gid; /* Low 16 bits of Group Id */ 572 __le16 i_links_count; /* Links count */ 573 __le32 i_blocks_lo; /* Blocks count */ 574 __le32 i_flags; /* File flags */ 575 union { 576 struct { 577 __le32 l_i_version; 578 } linux1; 579 struct { 580 __u32 h_i_translator; 581 } hurd1; 582 struct { 583 __u32 m_i_reserved1; 584 } masix1; 585 } osd1; /* OS dependent 1 */ 586 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 587 __le32 i_generation; /* File version (for NFS) */ 588 __le32 i_file_acl_lo; /* File ACL */ 589 __le32 i_size_high; 590 __le32 i_obso_faddr; /* Obsoleted fragment address */ 591 union { 592 struct { 593 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 594 __le16 l_i_file_acl_high; 595 __le16 l_i_uid_high; /* these 2 fields */ 596 __le16 l_i_gid_high; /* were reserved2[0] */ 597 __u32 l_i_reserved2; 598 } linux2; 599 struct { 600 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 601 __u16 h_i_mode_high; 602 __u16 h_i_uid_high; 603 __u16 h_i_gid_high; 604 __u32 h_i_author; 605 } hurd2; 606 struct { 607 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 608 __le16 m_i_file_acl_high; 609 __u32 m_i_reserved2[2]; 610 } masix2; 611 } osd2; /* OS dependent 2 */ 612 __le16 i_extra_isize; 613 __le16 i_pad1; 614 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 615 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 616 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 617 __le32 i_crtime; /* File Creation time */ 618 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 619 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 620 }; 621 622 struct move_extent { 623 __u32 reserved; /* should be zero */ 624 __u32 donor_fd; /* donor file descriptor */ 625 __u64 orig_start; /* logical start offset in block for orig */ 626 __u64 donor_start; /* logical start offset in block for donor */ 627 __u64 len; /* block length to be moved */ 628 __u64 moved_len; /* moved block length */ 629 }; 630 631 #define EXT4_EPOCH_BITS 2 632 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 633 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 634 635 /* 636 * Extended fields will fit into an inode if the filesystem was formatted 637 * with large inodes (-I 256 or larger) and there are not currently any EAs 638 * consuming all of the available space. For new inodes we always reserve 639 * enough space for the kernel's known extended fields, but for inodes 640 * created with an old kernel this might not have been the case. None of 641 * the extended inode fields is critical for correct filesystem operation. 642 * This macro checks if a certain field fits in the inode. Note that 643 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 644 */ 645 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 646 ((offsetof(typeof(*ext4_inode), field) + \ 647 sizeof((ext4_inode)->field)) \ 648 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 649 (einode)->i_extra_isize)) \ 650 651 static inline __le32 ext4_encode_extra_time(struct timespec *time) 652 { 653 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 654 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | 655 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); 656 } 657 658 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 659 { 660 if (sizeof(time->tv_sec) > 4) 661 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 662 << 32; 663 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 664 } 665 666 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 667 do { \ 668 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 669 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 670 (raw_inode)->xtime ## _extra = \ 671 ext4_encode_extra_time(&(inode)->xtime); \ 672 } while (0) 673 674 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 675 do { \ 676 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 677 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 678 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 679 (raw_inode)->xtime ## _extra = \ 680 ext4_encode_extra_time(&(einode)->xtime); \ 681 } while (0) 682 683 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 684 do { \ 685 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 686 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 687 ext4_decode_extra_time(&(inode)->xtime, \ 688 raw_inode->xtime ## _extra); \ 689 } while (0) 690 691 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 692 do { \ 693 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 694 (einode)->xtime.tv_sec = \ 695 (signed)le32_to_cpu((raw_inode)->xtime); \ 696 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 697 ext4_decode_extra_time(&(einode)->xtime, \ 698 raw_inode->xtime ## _extra); \ 699 } while (0) 700 701 #define i_disk_version osd1.linux1.l_i_version 702 703 #if defined(__KERNEL__) || defined(__linux__) 704 #define i_reserved1 osd1.linux1.l_i_reserved1 705 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 706 #define i_blocks_high osd2.linux2.l_i_blocks_high 707 #define i_uid_low i_uid 708 #define i_gid_low i_gid 709 #define i_uid_high osd2.linux2.l_i_uid_high 710 #define i_gid_high osd2.linux2.l_i_gid_high 711 #define i_reserved2 osd2.linux2.l_i_reserved2 712 713 #elif defined(__GNU__) 714 715 #define i_translator osd1.hurd1.h_i_translator 716 #define i_uid_high osd2.hurd2.h_i_uid_high 717 #define i_gid_high osd2.hurd2.h_i_gid_high 718 #define i_author osd2.hurd2.h_i_author 719 720 #elif defined(__masix__) 721 722 #define i_reserved1 osd1.masix1.m_i_reserved1 723 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 724 #define i_reserved2 osd2.masix2.m_i_reserved2 725 726 #endif /* defined(__KERNEL__) || defined(__linux__) */ 727 728 /* 729 * storage for cached extent 730 */ 731 struct ext4_ext_cache { 732 ext4_fsblk_t ec_start; 733 ext4_lblk_t ec_block; 734 __u32 ec_len; /* must be 32bit to return holes */ 735 __u32 ec_type; 736 }; 737 738 /* 739 * fourth extended file system inode data in memory 740 */ 741 struct ext4_inode_info { 742 __le32 i_data[15]; /* unconverted */ 743 __u32 i_dtime; 744 ext4_fsblk_t i_file_acl; 745 746 /* 747 * i_block_group is the number of the block group which contains 748 * this file's inode. Constant across the lifetime of the inode, 749 * it is ued for making block allocation decisions - we try to 750 * place a file's data blocks near its inode block, and new inodes 751 * near to their parent directory's inode. 752 */ 753 ext4_group_t i_block_group; 754 unsigned long i_state_flags; /* Dynamic state flags */ 755 unsigned long i_flags; 756 757 ext4_lblk_t i_dir_start_lookup; 758 #ifdef CONFIG_EXT4_FS_XATTR 759 /* 760 * Extended attributes can be read independently of the main file 761 * data. Taking i_mutex even when reading would cause contention 762 * between readers of EAs and writers of regular file data, so 763 * instead we synchronize on xattr_sem when reading or changing 764 * EAs. 765 */ 766 struct rw_semaphore xattr_sem; 767 #endif 768 769 struct list_head i_orphan; /* unlinked but open inodes */ 770 771 /* 772 * i_disksize keeps track of what the inode size is ON DISK, not 773 * in memory. During truncate, i_size is set to the new size by 774 * the VFS prior to calling ext4_truncate(), but the filesystem won't 775 * set i_disksize to 0 until the truncate is actually under way. 776 * 777 * The intent is that i_disksize always represents the blocks which 778 * are used by this file. This allows recovery to restart truncate 779 * on orphans if we crash during truncate. We actually write i_disksize 780 * into the on-disk inode when writing inodes out, instead of i_size. 781 * 782 * The only time when i_disksize and i_size may be different is when 783 * a truncate is in progress. The only things which change i_disksize 784 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 785 */ 786 loff_t i_disksize; 787 788 /* 789 * i_data_sem is for serialising ext4_truncate() against 790 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 791 * data tree are chopped off during truncate. We can't do that in 792 * ext4 because whenever we perform intermediate commits during 793 * truncate, the inode and all the metadata blocks *must* be in a 794 * consistent state which allows truncation of the orphans to restart 795 * during recovery. Hence we must fix the get_block-vs-truncate race 796 * by other means, so we have i_data_sem. 797 */ 798 struct rw_semaphore i_data_sem; 799 struct inode vfs_inode; 800 struct jbd2_inode jinode; 801 802 struct ext4_ext_cache i_cached_extent; 803 /* 804 * File creation time. Its function is same as that of 805 * struct timespec i_{a,c,m}time in the generic inode. 806 */ 807 struct timespec i_crtime; 808 809 /* mballoc */ 810 struct list_head i_prealloc_list; 811 spinlock_t i_prealloc_lock; 812 813 /* ialloc */ 814 ext4_group_t i_last_alloc_group; 815 816 /* allocation reservation info for delalloc */ 817 unsigned int i_reserved_data_blocks; 818 unsigned int i_reserved_meta_blocks; 819 unsigned int i_allocated_meta_blocks; 820 unsigned short i_delalloc_reserved_flag; 821 sector_t i_da_metadata_calc_last_lblock; 822 int i_da_metadata_calc_len; 823 824 /* on-disk additional length */ 825 __u16 i_extra_isize; 826 827 spinlock_t i_block_reservation_lock; 828 #ifdef CONFIG_QUOTA 829 /* quota space reservation, managed internally by quota code */ 830 qsize_t i_reserved_quota; 831 #endif 832 833 /* completed IOs that might need unwritten extents handling */ 834 struct list_head i_completed_io_list; 835 spinlock_t i_completed_io_lock; 836 /* current io_end structure for async DIO write*/ 837 ext4_io_end_t *cur_aio_dio; 838 839 /* 840 * Transactions that contain inode's metadata needed to complete 841 * fsync and fdatasync, respectively. 842 */ 843 tid_t i_sync_tid; 844 tid_t i_datasync_tid; 845 }; 846 847 /* 848 * File system states 849 */ 850 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 851 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 852 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 853 854 /* 855 * Misc. filesystem flags 856 */ 857 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 858 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 859 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 860 861 /* 862 * Mount flags 863 */ 864 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */ 865 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 866 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 867 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 868 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 869 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 870 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 871 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 872 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 873 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 874 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 875 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 876 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 877 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 878 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 879 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 880 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 881 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 882 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 883 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 884 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 885 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 886 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 887 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 888 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */ 889 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 890 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 891 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 892 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 893 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 894 895 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt 896 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt 897 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 898 EXT4_MOUNT_##opt) 899 900 #define ext4_set_bit ext2_set_bit 901 #define ext4_set_bit_atomic ext2_set_bit_atomic 902 #define ext4_clear_bit ext2_clear_bit 903 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 904 #define ext4_test_bit ext2_test_bit 905 #define ext4_find_first_zero_bit ext2_find_first_zero_bit 906 #define ext4_find_next_zero_bit ext2_find_next_zero_bit 907 #define ext4_find_next_bit ext2_find_next_bit 908 909 /* 910 * Maximal mount counts between two filesystem checks 911 */ 912 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 913 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 914 915 /* 916 * Behaviour when detecting errors 917 */ 918 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 919 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 920 #define EXT4_ERRORS_PANIC 3 /* Panic */ 921 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 922 923 /* 924 * Structure of the super block 925 */ 926 struct ext4_super_block { 927 /*00*/ __le32 s_inodes_count; /* Inodes count */ 928 __le32 s_blocks_count_lo; /* Blocks count */ 929 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 930 __le32 s_free_blocks_count_lo; /* Free blocks count */ 931 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 932 __le32 s_first_data_block; /* First Data Block */ 933 __le32 s_log_block_size; /* Block size */ 934 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */ 935 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 936 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */ 937 __le32 s_inodes_per_group; /* # Inodes per group */ 938 __le32 s_mtime; /* Mount time */ 939 /*30*/ __le32 s_wtime; /* Write time */ 940 __le16 s_mnt_count; /* Mount count */ 941 __le16 s_max_mnt_count; /* Maximal mount count */ 942 __le16 s_magic; /* Magic signature */ 943 __le16 s_state; /* File system state */ 944 __le16 s_errors; /* Behaviour when detecting errors */ 945 __le16 s_minor_rev_level; /* minor revision level */ 946 /*40*/ __le32 s_lastcheck; /* time of last check */ 947 __le32 s_checkinterval; /* max. time between checks */ 948 __le32 s_creator_os; /* OS */ 949 __le32 s_rev_level; /* Revision level */ 950 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 951 __le16 s_def_resgid; /* Default gid for reserved blocks */ 952 /* 953 * These fields are for EXT4_DYNAMIC_REV superblocks only. 954 * 955 * Note: the difference between the compatible feature set and 956 * the incompatible feature set is that if there is a bit set 957 * in the incompatible feature set that the kernel doesn't 958 * know about, it should refuse to mount the filesystem. 959 * 960 * e2fsck's requirements are more strict; if it doesn't know 961 * about a feature in either the compatible or incompatible 962 * feature set, it must abort and not try to meddle with 963 * things it doesn't understand... 964 */ 965 __le32 s_first_ino; /* First non-reserved inode */ 966 __le16 s_inode_size; /* size of inode structure */ 967 __le16 s_block_group_nr; /* block group # of this superblock */ 968 __le32 s_feature_compat; /* compatible feature set */ 969 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 970 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 971 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 972 /*78*/ char s_volume_name[16]; /* volume name */ 973 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 974 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 975 /* 976 * Performance hints. Directory preallocation should only 977 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 978 */ 979 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 980 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 981 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 982 /* 983 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 984 */ 985 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 986 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 987 __le32 s_journal_dev; /* device number of journal file */ 988 __le32 s_last_orphan; /* start of list of inodes to delete */ 989 __le32 s_hash_seed[4]; /* HTREE hash seed */ 990 __u8 s_def_hash_version; /* Default hash version to use */ 991 __u8 s_jnl_backup_type; 992 __le16 s_desc_size; /* size of group descriptor */ 993 /*100*/ __le32 s_default_mount_opts; 994 __le32 s_first_meta_bg; /* First metablock block group */ 995 __le32 s_mkfs_time; /* When the filesystem was created */ 996 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 997 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 998 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 999 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1000 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1001 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1002 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1003 __le32 s_flags; /* Miscellaneous flags */ 1004 __le16 s_raid_stride; /* RAID stride */ 1005 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */ 1006 __le64 s_mmp_block; /* Block for multi-mount protection */ 1007 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1008 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1009 __u8 s_reserved_char_pad; 1010 __le16 s_reserved_pad; 1011 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1012 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1013 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1014 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1015 snapshot's future use */ 1016 __le32 s_snapshot_list; /* inode number of the head of the 1017 on-disk snapshot list */ 1018 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1019 __le32 s_error_count; /* number of fs errors */ 1020 __le32 s_first_error_time; /* first time an error happened */ 1021 __le32 s_first_error_ino; /* inode involved in first error */ 1022 __le64 s_first_error_block; /* block involved of first error */ 1023 __u8 s_first_error_func[32]; /* function where the error happened */ 1024 __le32 s_first_error_line; /* line number where error happened */ 1025 __le32 s_last_error_time; /* most recent time of an error */ 1026 __le32 s_last_error_ino; /* inode involved in last error */ 1027 __le32 s_last_error_line; /* line number where error happened */ 1028 __le64 s_last_error_block; /* block involved of last error */ 1029 __u8 s_last_error_func[32]; /* function where the error happened */ 1030 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1031 __u8 s_mount_opts[64]; 1032 __le32 s_reserved[112]; /* Padding to the end of the block */ 1033 }; 1034 1035 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1036 1037 #ifdef __KERNEL__ 1038 1039 /* 1040 * run-time mount flags 1041 */ 1042 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1043 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1044 1045 /* 1046 * fourth extended-fs super-block data in memory 1047 */ 1048 struct ext4_sb_info { 1049 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1050 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1051 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1052 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1053 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1054 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1055 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1056 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1057 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1058 unsigned long s_overhead_last; /* Last calculated overhead */ 1059 unsigned long s_blocks_last; /* Last seen block count */ 1060 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1061 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1062 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1063 struct buffer_head **s_group_desc; 1064 unsigned int s_mount_opt; 1065 unsigned int s_mount_flags; 1066 ext4_fsblk_t s_sb_block; 1067 uid_t s_resuid; 1068 gid_t s_resgid; 1069 unsigned short s_mount_state; 1070 unsigned short s_pad; 1071 int s_addr_per_block_bits; 1072 int s_desc_per_block_bits; 1073 int s_inode_size; 1074 int s_first_ino; 1075 unsigned int s_inode_readahead_blks; 1076 unsigned int s_inode_goal; 1077 spinlock_t s_next_gen_lock; 1078 u32 s_next_generation; 1079 u32 s_hash_seed[4]; 1080 int s_def_hash_version; 1081 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1082 struct percpu_counter s_freeblocks_counter; 1083 struct percpu_counter s_freeinodes_counter; 1084 struct percpu_counter s_dirs_counter; 1085 struct percpu_counter s_dirtyblocks_counter; 1086 struct blockgroup_lock *s_blockgroup_lock; 1087 struct proc_dir_entry *s_proc; 1088 struct kobject s_kobj; 1089 struct completion s_kobj_unregister; 1090 1091 /* Journaling */ 1092 struct journal_s *s_journal; 1093 struct list_head s_orphan; 1094 struct mutex s_orphan_lock; 1095 struct mutex s_resize_lock; 1096 unsigned long s_commit_interval; 1097 u32 s_max_batch_time; 1098 u32 s_min_batch_time; 1099 struct block_device *journal_bdev; 1100 #ifdef CONFIG_JBD2_DEBUG 1101 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */ 1102 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */ 1103 #endif 1104 #ifdef CONFIG_QUOTA 1105 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ 1106 int s_jquota_fmt; /* Format of quota to use */ 1107 #endif 1108 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1109 struct rb_root system_blks; 1110 1111 #ifdef EXTENTS_STATS 1112 /* ext4 extents stats */ 1113 unsigned long s_ext_min; 1114 unsigned long s_ext_max; 1115 unsigned long s_depth_max; 1116 spinlock_t s_ext_stats_lock; 1117 unsigned long s_ext_blocks; 1118 unsigned long s_ext_extents; 1119 #endif 1120 1121 /* for buddy allocator */ 1122 struct ext4_group_info ***s_group_info; 1123 struct inode *s_buddy_cache; 1124 spinlock_t s_md_lock; 1125 unsigned short *s_mb_offsets; 1126 unsigned int *s_mb_maxs; 1127 1128 /* tunables */ 1129 unsigned long s_stripe; 1130 unsigned int s_mb_stream_request; 1131 unsigned int s_mb_max_to_scan; 1132 unsigned int s_mb_min_to_scan; 1133 unsigned int s_mb_stats; 1134 unsigned int s_mb_order2_reqs; 1135 unsigned int s_mb_group_prealloc; 1136 unsigned int s_max_writeback_mb_bump; 1137 /* where last allocation was done - for stream allocation */ 1138 unsigned long s_mb_last_group; 1139 unsigned long s_mb_last_start; 1140 1141 /* stats for buddy allocator */ 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 /* Lazy inode table initialization info */ 1174 struct ext4_li_request *s_li_request; 1175 /* Wait multiplier for lazy initialization thread */ 1176 unsigned int s_li_wait_mult; 1177 }; 1178 1179 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1180 { 1181 return sb->s_fs_info; 1182 } 1183 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1184 { 1185 return container_of(inode, struct ext4_inode_info, vfs_inode); 1186 } 1187 1188 static inline struct timespec ext4_current_time(struct inode *inode) 1189 { 1190 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1191 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1192 } 1193 1194 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1195 { 1196 return ino == EXT4_ROOT_INO || 1197 ino == EXT4_JOURNAL_INO || 1198 ino == EXT4_RESIZE_INO || 1199 (ino >= EXT4_FIRST_INO(sb) && 1200 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1201 } 1202 1203 /* 1204 * Inode dynamic state flags 1205 */ 1206 enum { 1207 EXT4_STATE_JDATA, /* journaled data exists */ 1208 EXT4_STATE_NEW, /* inode is newly created */ 1209 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1210 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1211 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1212 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1213 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1214 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1215 }; 1216 1217 #define EXT4_INODE_BIT_FNS(name, field) \ 1218 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1219 { \ 1220 return test_bit(bit, &EXT4_I(inode)->i_##field); \ 1221 } \ 1222 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1223 { \ 1224 set_bit(bit, &EXT4_I(inode)->i_##field); \ 1225 } \ 1226 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1227 { \ 1228 clear_bit(bit, &EXT4_I(inode)->i_##field); \ 1229 } 1230 1231 EXT4_INODE_BIT_FNS(flag, flags) 1232 EXT4_INODE_BIT_FNS(state, state_flags) 1233 #else 1234 /* Assume that user mode programs are passing in an ext4fs superblock, not 1235 * a kernel struct super_block. This will allow us to call the feature-test 1236 * macros from user land. */ 1237 #define EXT4_SB(sb) (sb) 1238 #endif 1239 1240 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1241 1242 /* 1243 * Codes for operating systems 1244 */ 1245 #define EXT4_OS_LINUX 0 1246 #define EXT4_OS_HURD 1 1247 #define EXT4_OS_MASIX 2 1248 #define EXT4_OS_FREEBSD 3 1249 #define EXT4_OS_LITES 4 1250 1251 /* 1252 * Revision levels 1253 */ 1254 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1255 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1256 1257 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1258 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1259 1260 #define EXT4_GOOD_OLD_INODE_SIZE 128 1261 1262 /* 1263 * Feature set definitions 1264 */ 1265 1266 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1267 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1268 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1269 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1270 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1271 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1272 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1273 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1274 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1275 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1276 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1277 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1278 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1279 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1280 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1281 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1282 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1283 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1284 1285 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1286 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1287 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1288 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1289 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1290 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1291 1292 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1293 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1294 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1295 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1296 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1297 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1298 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1299 1300 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1301 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1302 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1303 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1304 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1305 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1306 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1307 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1308 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1309 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1310 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1311 1312 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 1313 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1314 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1315 EXT4_FEATURE_INCOMPAT_META_BG| \ 1316 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1317 EXT4_FEATURE_INCOMPAT_64BIT| \ 1318 EXT4_FEATURE_INCOMPAT_FLEX_BG) 1319 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1320 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1321 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1322 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1323 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1324 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1325 EXT4_FEATURE_RO_COMPAT_HUGE_FILE) 1326 1327 /* 1328 * Default values for user and/or group using reserved blocks 1329 */ 1330 #define EXT4_DEF_RESUID 0 1331 #define EXT4_DEF_RESGID 0 1332 1333 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1334 1335 /* 1336 * Default mount options 1337 */ 1338 #define EXT4_DEFM_DEBUG 0x0001 1339 #define EXT4_DEFM_BSDGROUPS 0x0002 1340 #define EXT4_DEFM_XATTR_USER 0x0004 1341 #define EXT4_DEFM_ACL 0x0008 1342 #define EXT4_DEFM_UID16 0x0010 1343 #define EXT4_DEFM_JMODE 0x0060 1344 #define EXT4_DEFM_JMODE_DATA 0x0020 1345 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1346 #define EXT4_DEFM_JMODE_WBACK 0x0060 1347 #define EXT4_DEFM_NOBARRIER 0x0100 1348 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1349 #define EXT4_DEFM_DISCARD 0x0400 1350 #define EXT4_DEFM_NODELALLOC 0x0800 1351 1352 /* 1353 * Default journal batch times 1354 */ 1355 #define EXT4_DEF_MIN_BATCH_TIME 0 1356 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1357 1358 /* 1359 * Minimum number of groups in a flexgroup before we separate out 1360 * directories into the first block group of a flexgroup 1361 */ 1362 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1363 1364 /* 1365 * Structure of a directory entry 1366 */ 1367 #define EXT4_NAME_LEN 255 1368 1369 struct ext4_dir_entry { 1370 __le32 inode; /* Inode number */ 1371 __le16 rec_len; /* Directory entry length */ 1372 __le16 name_len; /* Name length */ 1373 char name[EXT4_NAME_LEN]; /* File name */ 1374 }; 1375 1376 /* 1377 * The new version of the directory entry. Since EXT4 structures are 1378 * stored in intel byte order, and the name_len field could never be 1379 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1380 * file_type field. 1381 */ 1382 struct ext4_dir_entry_2 { 1383 __le32 inode; /* Inode number */ 1384 __le16 rec_len; /* Directory entry length */ 1385 __u8 name_len; /* Name length */ 1386 __u8 file_type; 1387 char name[EXT4_NAME_LEN]; /* File name */ 1388 }; 1389 1390 /* 1391 * Ext4 directory file types. Only the low 3 bits are used. The 1392 * other bits are reserved for now. 1393 */ 1394 #define EXT4_FT_UNKNOWN 0 1395 #define EXT4_FT_REG_FILE 1 1396 #define EXT4_FT_DIR 2 1397 #define EXT4_FT_CHRDEV 3 1398 #define EXT4_FT_BLKDEV 4 1399 #define EXT4_FT_FIFO 5 1400 #define EXT4_FT_SOCK 6 1401 #define EXT4_FT_SYMLINK 7 1402 1403 #define EXT4_FT_MAX 8 1404 1405 /* 1406 * EXT4_DIR_PAD defines the directory entries boundaries 1407 * 1408 * NOTE: It must be a multiple of 4 1409 */ 1410 #define EXT4_DIR_PAD 4 1411 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1412 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1413 ~EXT4_DIR_ROUND) 1414 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1415 1416 /* 1417 * If we ever get support for fs block sizes > page_size, we'll need 1418 * to remove the #if statements in the next two functions... 1419 */ 1420 static inline unsigned int 1421 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1422 { 1423 unsigned len = le16_to_cpu(dlen); 1424 1425 #if (PAGE_CACHE_SIZE >= 65536) 1426 if (len == EXT4_MAX_REC_LEN || len == 0) 1427 return blocksize; 1428 return (len & 65532) | ((len & 3) << 16); 1429 #else 1430 return len; 1431 #endif 1432 } 1433 1434 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1435 { 1436 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1437 BUG(); 1438 #if (PAGE_CACHE_SIZE >= 65536) 1439 if (len < 65536) 1440 return cpu_to_le16(len); 1441 if (len == blocksize) { 1442 if (blocksize == 65536) 1443 return cpu_to_le16(EXT4_MAX_REC_LEN); 1444 else 1445 return cpu_to_le16(0); 1446 } 1447 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 1448 #else 1449 return cpu_to_le16(len); 1450 #endif 1451 } 1452 1453 /* 1454 * Hash Tree Directory indexing 1455 * (c) Daniel Phillips, 2001 1456 */ 1457 1458 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 1459 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 1460 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 1461 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 1462 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 1463 1464 /* Legal values for the dx_root hash_version field: */ 1465 1466 #define DX_HASH_LEGACY 0 1467 #define DX_HASH_HALF_MD4 1 1468 #define DX_HASH_TEA 2 1469 #define DX_HASH_LEGACY_UNSIGNED 3 1470 #define DX_HASH_HALF_MD4_UNSIGNED 4 1471 #define DX_HASH_TEA_UNSIGNED 5 1472 1473 #ifdef __KERNEL__ 1474 1475 /* hash info structure used by the directory hash */ 1476 struct dx_hash_info 1477 { 1478 u32 hash; 1479 u32 minor_hash; 1480 int hash_version; 1481 u32 *seed; 1482 }; 1483 1484 #define EXT4_HTREE_EOF 0x7fffffff 1485 1486 /* 1487 * Control parameters used by ext4_htree_next_block 1488 */ 1489 #define HASH_NB_ALWAYS 1 1490 1491 1492 /* 1493 * Describe an inode's exact location on disk and in memory 1494 */ 1495 struct ext4_iloc 1496 { 1497 struct buffer_head *bh; 1498 unsigned long offset; 1499 ext4_group_t block_group; 1500 }; 1501 1502 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 1503 { 1504 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 1505 } 1506 1507 /* 1508 * This structure is stuffed into the struct file's private_data field 1509 * for directories. It is where we put information so that we can do 1510 * readdir operations in hash tree order. 1511 */ 1512 struct dir_private_info { 1513 struct rb_root root; 1514 struct rb_node *curr_node; 1515 struct fname *extra_fname; 1516 loff_t last_pos; 1517 __u32 curr_hash; 1518 __u32 curr_minor_hash; 1519 __u32 next_hash; 1520 }; 1521 1522 /* calculate the first block number of the group */ 1523 static inline ext4_fsblk_t 1524 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 1525 { 1526 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 1527 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 1528 } 1529 1530 /* 1531 * Special error return code only used by dx_probe() and its callers. 1532 */ 1533 #define ERR_BAD_DX_DIR -75000 1534 1535 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, 1536 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); 1537 1538 extern struct proc_dir_entry *ext4_proc_root; 1539 1540 /* 1541 * Timeout and state flag for lazy initialization inode thread. 1542 */ 1543 #define EXT4_DEF_LI_WAIT_MULT 10 1544 #define EXT4_DEF_LI_MAX_START_DELAY 5 1545 #define EXT4_LAZYINIT_QUIT 0x0001 1546 #define EXT4_LAZYINIT_RUNNING 0x0002 1547 1548 /* 1549 * Lazy inode table initialization info 1550 */ 1551 struct ext4_lazy_init { 1552 unsigned long li_state; 1553 1554 wait_queue_head_t li_wait_daemon; 1555 wait_queue_head_t li_wait_task; 1556 struct timer_list li_timer; 1557 struct task_struct *li_task; 1558 1559 struct list_head li_request_list; 1560 struct mutex li_list_mtx; 1561 }; 1562 1563 struct ext4_li_request { 1564 struct super_block *lr_super; 1565 struct ext4_sb_info *lr_sbi; 1566 ext4_group_t lr_next_group; 1567 struct list_head lr_request; 1568 unsigned long lr_next_sched; 1569 unsigned long lr_timeout; 1570 }; 1571 1572 struct ext4_features { 1573 struct kobject f_kobj; 1574 struct completion f_kobj_unregister; 1575 }; 1576 1577 /* 1578 * Function prototypes 1579 */ 1580 1581 /* 1582 * Ok, these declarations are also in <linux/kernel.h> but none of the 1583 * ext4 source programs needs to include it so they are duplicated here. 1584 */ 1585 # define NORET_TYPE /**/ 1586 # define ATTRIB_NORET __attribute__((noreturn)) 1587 # define NORET_AND noreturn, 1588 1589 /* bitmap.c */ 1590 extern unsigned int ext4_count_free(struct buffer_head *, unsigned); 1591 1592 /* balloc.c */ 1593 extern unsigned int ext4_block_group(struct super_block *sb, 1594 ext4_fsblk_t blocknr); 1595 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 1596 ext4_fsblk_t blocknr); 1597 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 1598 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 1599 ext4_group_t group); 1600 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 1601 ext4_fsblk_t goal, unsigned long *count, int *errp); 1602 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); 1603 extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); 1604 extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb, 1605 ext4_fsblk_t block, unsigned long count); 1606 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *); 1607 extern void ext4_check_blocks_bitmap(struct super_block *); 1608 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 1609 ext4_group_t block_group, 1610 struct buffer_head ** bh); 1611 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1612 struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 1613 ext4_group_t block_group); 1614 extern unsigned ext4_init_block_bitmap(struct super_block *sb, 1615 struct buffer_head *bh, 1616 ext4_group_t group, 1617 struct ext4_group_desc *desc); 1618 #define ext4_free_blocks_after_init(sb, group, desc) \ 1619 ext4_init_block_bitmap(sb, NULL, group, desc) 1620 1621 /* dir.c */ 1622 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 1623 struct ext4_dir_entry_2 *, 1624 struct buffer_head *, unsigned int); 1625 #define ext4_check_dir_entry(dir, de, bh, offset) \ 1626 __ext4_check_dir_entry(__func__, __LINE__, (dir), (de), (bh), (offset)) 1627 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 1628 __u32 minor_hash, 1629 struct ext4_dir_entry_2 *dirent); 1630 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 1631 1632 /* fsync.c */ 1633 extern int ext4_sync_file(struct file *, int); 1634 1635 /* hash.c */ 1636 extern int ext4fs_dirhash(const char *name, int len, struct 1637 dx_hash_info *hinfo); 1638 1639 /* ialloc.c */ 1640 extern struct inode *ext4_new_inode(handle_t *, struct inode *, int, 1641 const struct qstr *qstr, __u32 goal); 1642 extern void ext4_free_inode(handle_t *, struct inode *); 1643 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 1644 extern unsigned long ext4_count_free_inodes(struct super_block *); 1645 extern unsigned long ext4_count_dirs(struct super_block *); 1646 extern void ext4_check_inodes_bitmap(struct super_block *); 1647 extern unsigned ext4_init_inode_bitmap(struct super_block *sb, 1648 struct buffer_head *bh, 1649 ext4_group_t group, 1650 struct ext4_group_desc *desc); 1651 extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 1652 extern int ext4_init_inode_table(struct super_block *sb, 1653 ext4_group_t group, int barrier); 1654 1655 /* mballoc.c */ 1656 extern long ext4_mb_stats; 1657 extern long ext4_mb_max_to_scan; 1658 extern int ext4_mb_init(struct super_block *, int); 1659 extern int ext4_mb_release(struct super_block *); 1660 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 1661 struct ext4_allocation_request *, int *); 1662 extern int ext4_mb_reserve_blocks(struct super_block *, int); 1663 extern void ext4_discard_preallocations(struct inode *); 1664 extern int __init init_ext4_mballoc(void); 1665 extern void exit_ext4_mballoc(void); 1666 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 1667 struct buffer_head *bh, ext4_fsblk_t block, 1668 unsigned long count, int flags); 1669 extern int ext4_mb_add_groupinfo(struct super_block *sb, 1670 ext4_group_t i, struct ext4_group_desc *desc); 1671 extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t); 1672 extern void ext4_mb_put_buddy_cache_lock(struct super_block *, 1673 ext4_group_t, int); 1674 /* inode.c */ 1675 struct buffer_head *ext4_getblk(handle_t *, struct inode *, 1676 ext4_lblk_t, int, int *); 1677 struct buffer_head *ext4_bread(handle_t *, struct inode *, 1678 ext4_lblk_t, int, int *); 1679 int ext4_get_block(struct inode *inode, sector_t iblock, 1680 struct buffer_head *bh_result, int create); 1681 1682 extern struct inode *ext4_iget(struct super_block *, unsigned long); 1683 extern int ext4_write_inode(struct inode *, struct writeback_control *); 1684 extern int ext4_setattr(struct dentry *, struct iattr *); 1685 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 1686 struct kstat *stat); 1687 extern void ext4_evict_inode(struct inode *); 1688 extern void ext4_clear_inode(struct inode *); 1689 extern int ext4_sync_inode(handle_t *, struct inode *); 1690 extern void ext4_dirty_inode(struct inode *); 1691 extern int ext4_change_inode_journal_flag(struct inode *, int); 1692 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 1693 extern int ext4_can_truncate(struct inode *inode); 1694 extern void ext4_truncate(struct inode *); 1695 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 1696 extern void ext4_set_inode_flags(struct inode *); 1697 extern void ext4_get_inode_flags(struct ext4_inode_info *); 1698 extern int ext4_alloc_da_blocks(struct inode *inode); 1699 extern void ext4_set_aops(struct inode *inode); 1700 extern int ext4_writepage_trans_blocks(struct inode *); 1701 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks); 1702 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 1703 extern int ext4_block_truncate_page(handle_t *handle, 1704 struct address_space *mapping, loff_t from); 1705 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 1706 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 1707 extern int flush_completed_IO(struct inode *inode); 1708 extern void ext4_da_update_reserve_space(struct inode *inode, 1709 int used, int quota_claim); 1710 /* ioctl.c */ 1711 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 1712 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 1713 1714 /* migrate.c */ 1715 extern int ext4_ext_migrate(struct inode *); 1716 1717 /* namei.c */ 1718 extern int ext4_orphan_add(handle_t *, struct inode *); 1719 extern int ext4_orphan_del(handle_t *, struct inode *); 1720 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 1721 __u32 start_minor_hash, __u32 *next_hash); 1722 1723 /* resize.c */ 1724 extern int ext4_group_add(struct super_block *sb, 1725 struct ext4_new_group_data *input); 1726 extern int ext4_group_extend(struct super_block *sb, 1727 struct ext4_super_block *es, 1728 ext4_fsblk_t n_blocks_count); 1729 1730 /* super.c */ 1731 extern void __ext4_error(struct super_block *, const char *, unsigned int, 1732 const char *, ...) 1733 __attribute__ ((format (printf, 4, 5))); 1734 #define ext4_error(sb, message...) __ext4_error(sb, __func__, \ 1735 __LINE__, ## message) 1736 extern void ext4_error_inode(struct inode *, const char *, unsigned int, 1737 ext4_fsblk_t, const char *, ...) 1738 __attribute__ ((format (printf, 5, 6))); 1739 extern void ext4_error_file(struct file *, const char *, unsigned int, 1740 const char *, ...) 1741 __attribute__ ((format (printf, 4, 5))); 1742 extern void __ext4_std_error(struct super_block *, const char *, 1743 unsigned int, int); 1744 extern void __ext4_abort(struct super_block *, const char *, unsigned int, 1745 const char *, ...) 1746 __attribute__ ((format (printf, 4, 5))); 1747 #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \ 1748 __LINE__, ## message) 1749 extern void __ext4_warning(struct super_block *, const char *, unsigned int, 1750 const char *, ...) 1751 __attribute__ ((format (printf, 4, 5))); 1752 #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \ 1753 __LINE__, ## message) 1754 extern void ext4_msg(struct super_block *, const char *, const char *, ...) 1755 __attribute__ ((format (printf, 3, 4))); 1756 extern void __ext4_grp_locked_error(const char *, unsigned int, \ 1757 struct super_block *, ext4_group_t, \ 1758 unsigned long, ext4_fsblk_t, \ 1759 const char *, ...) 1760 __attribute__ ((format (printf, 7, 8))); 1761 #define ext4_grp_locked_error(sb, grp, message...) \ 1762 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message) 1763 extern void ext4_update_dynamic_rev(struct super_block *sb); 1764 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 1765 __u32 compat); 1766 extern int ext4_update_rocompat_feature(handle_t *handle, 1767 struct super_block *sb, __u32 rocompat); 1768 extern int ext4_update_incompat_feature(handle_t *handle, 1769 struct super_block *sb, __u32 incompat); 1770 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 1771 struct ext4_group_desc *bg); 1772 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 1773 struct ext4_group_desc *bg); 1774 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 1775 struct ext4_group_desc *bg); 1776 extern __u32 ext4_free_blks_count(struct super_block *sb, 1777 struct ext4_group_desc *bg); 1778 extern __u32 ext4_free_inodes_count(struct super_block *sb, 1779 struct ext4_group_desc *bg); 1780 extern __u32 ext4_used_dirs_count(struct super_block *sb, 1781 struct ext4_group_desc *bg); 1782 extern __u32 ext4_itable_unused_count(struct super_block *sb, 1783 struct ext4_group_desc *bg); 1784 extern void ext4_block_bitmap_set(struct super_block *sb, 1785 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1786 extern void ext4_inode_bitmap_set(struct super_block *sb, 1787 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1788 extern void ext4_inode_table_set(struct super_block *sb, 1789 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1790 extern void ext4_free_blks_set(struct super_block *sb, 1791 struct ext4_group_desc *bg, __u32 count); 1792 extern void ext4_free_inodes_set(struct super_block *sb, 1793 struct ext4_group_desc *bg, __u32 count); 1794 extern void ext4_used_dirs_set(struct super_block *sb, 1795 struct ext4_group_desc *bg, __u32 count); 1796 extern void ext4_itable_unused_set(struct super_block *sb, 1797 struct ext4_group_desc *bg, __u32 count); 1798 extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group, 1799 struct ext4_group_desc *gdp); 1800 extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group, 1801 struct ext4_group_desc *gdp); 1802 1803 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 1804 { 1805 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 1806 le32_to_cpu(es->s_blocks_count_lo); 1807 } 1808 1809 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 1810 { 1811 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 1812 le32_to_cpu(es->s_r_blocks_count_lo); 1813 } 1814 1815 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 1816 { 1817 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 1818 le32_to_cpu(es->s_free_blocks_count_lo); 1819 } 1820 1821 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 1822 ext4_fsblk_t blk) 1823 { 1824 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 1825 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 1826 } 1827 1828 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 1829 ext4_fsblk_t blk) 1830 { 1831 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 1832 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 1833 } 1834 1835 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 1836 ext4_fsblk_t blk) 1837 { 1838 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 1839 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 1840 } 1841 1842 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 1843 { 1844 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 1845 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 1846 le32_to_cpu(raw_inode->i_size_lo); 1847 else 1848 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 1849 } 1850 1851 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 1852 { 1853 raw_inode->i_size_lo = cpu_to_le32(i_size); 1854 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 1855 } 1856 1857 static inline 1858 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 1859 ext4_group_t group) 1860 { 1861 struct ext4_group_info ***grp_info; 1862 long indexv, indexh; 1863 grp_info = EXT4_SB(sb)->s_group_info; 1864 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 1865 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 1866 return grp_info[indexv][indexh]; 1867 } 1868 1869 /* 1870 * Reading s_groups_count requires using smp_rmb() afterwards. See 1871 * the locking protocol documented in the comments of ext4_group_add() 1872 * in resize.c 1873 */ 1874 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 1875 { 1876 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 1877 1878 smp_rmb(); 1879 return ngroups; 1880 } 1881 1882 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 1883 ext4_group_t block_group) 1884 { 1885 return block_group >> sbi->s_log_groups_per_flex; 1886 } 1887 1888 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 1889 { 1890 return 1 << sbi->s_log_groups_per_flex; 1891 } 1892 1893 #define ext4_std_error(sb, errno) \ 1894 do { \ 1895 if ((errno)) \ 1896 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 1897 } while (0) 1898 1899 #ifdef CONFIG_SMP 1900 /* Each CPU can accumulate percpu_counter_batch blocks in their local 1901 * counters. So we need to make sure we have free blocks more 1902 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 1903 */ 1904 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 1905 #else 1906 #define EXT4_FREEBLOCKS_WATERMARK 0 1907 #endif 1908 1909 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 1910 { 1911 /* 1912 * XXX: replace with spinlock if seen contended -bzzz 1913 */ 1914 down_write(&EXT4_I(inode)->i_data_sem); 1915 if (newsize > EXT4_I(inode)->i_disksize) 1916 EXT4_I(inode)->i_disksize = newsize; 1917 up_write(&EXT4_I(inode)->i_data_sem); 1918 return ; 1919 } 1920 1921 struct ext4_group_info { 1922 unsigned long bb_state; 1923 struct rb_root bb_free_root; 1924 ext4_grpblk_t bb_first_free; /* first free block */ 1925 ext4_grpblk_t bb_free; /* total free blocks */ 1926 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 1927 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 1928 struct list_head bb_prealloc_list; 1929 #ifdef DOUBLE_CHECK 1930 void *bb_bitmap; 1931 #endif 1932 struct rw_semaphore alloc_sem; 1933 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 1934 * regions, index is order. 1935 * bb_counters[3] = 5 means 1936 * 5 free 8-block regions. */ 1937 }; 1938 1939 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 1940 1941 #define EXT4_MB_GRP_NEED_INIT(grp) \ 1942 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 1943 1944 #define EXT4_MAX_CONTENTION 8 1945 #define EXT4_CONTENTION_THRESHOLD 2 1946 1947 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 1948 ext4_group_t group) 1949 { 1950 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 1951 } 1952 1953 /* 1954 * Returns true if the filesystem is busy enough that attempts to 1955 * access the block group locks has run into contention. 1956 */ 1957 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 1958 { 1959 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 1960 } 1961 1962 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 1963 { 1964 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 1965 if (spin_trylock(lock)) 1966 /* 1967 * We're able to grab the lock right away, so drop the 1968 * lock contention counter. 1969 */ 1970 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 1971 else { 1972 /* 1973 * The lock is busy, so bump the contention counter, 1974 * and then wait on the spin lock. 1975 */ 1976 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 1977 EXT4_MAX_CONTENTION); 1978 spin_lock(lock); 1979 } 1980 } 1981 1982 static inline void ext4_unlock_group(struct super_block *sb, 1983 ext4_group_t group) 1984 { 1985 spin_unlock(ext4_group_lock_ptr(sb, group)); 1986 } 1987 1988 static inline void ext4_mark_super_dirty(struct super_block *sb) 1989 { 1990 if (EXT4_SB(sb)->s_journal == NULL) 1991 sb->s_dirt =1; 1992 } 1993 1994 /* 1995 * Inodes and files operations 1996 */ 1997 1998 /* dir.c */ 1999 extern const struct file_operations ext4_dir_operations; 2000 2001 /* file.c */ 2002 extern const struct inode_operations ext4_file_inode_operations; 2003 extern const struct file_operations ext4_file_operations; 2004 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 2005 2006 /* namei.c */ 2007 extern const struct inode_operations ext4_dir_inode_operations; 2008 extern const struct inode_operations ext4_special_inode_operations; 2009 extern struct dentry *ext4_get_parent(struct dentry *child); 2010 2011 /* symlink.c */ 2012 extern const struct inode_operations ext4_symlink_inode_operations; 2013 extern const struct inode_operations ext4_fast_symlink_inode_operations; 2014 2015 /* block_validity */ 2016 extern void ext4_release_system_zone(struct super_block *sb); 2017 extern int ext4_setup_system_zone(struct super_block *sb); 2018 extern int __init init_ext4_system_zone(void); 2019 extern void exit_ext4_system_zone(void); 2020 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 2021 ext4_fsblk_t start_blk, 2022 unsigned int count); 2023 2024 /* extents.c */ 2025 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 2026 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 2027 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, 2028 int chunk); 2029 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 2030 struct ext4_map_blocks *map, int flags); 2031 extern void ext4_ext_truncate(struct inode *); 2032 extern void ext4_ext_init(struct super_block *); 2033 extern void ext4_ext_release(struct super_block *); 2034 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset, 2035 loff_t len); 2036 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset, 2037 ssize_t len); 2038 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 2039 struct ext4_map_blocks *map, int flags); 2040 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2041 __u64 start, __u64 len); 2042 /* move_extent.c */ 2043 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 2044 __u64 start_orig, __u64 start_donor, 2045 __u64 len, __u64 *moved_len); 2046 2047 2048 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */ 2049 enum ext4_state_bits { 2050 BH_Uninit /* blocks are allocated but uninitialized on disk */ 2051 = BH_JBDPrivateStart, 2052 }; 2053 2054 BUFFER_FNS(Uninit, uninit) 2055 TAS_BUFFER_FNS(Uninit, uninit) 2056 2057 /* 2058 * Add new method to test wether block and inode bitmaps are properly 2059 * initialized. With uninit_bg reading the block from disk is not enough 2060 * to mark the bitmap uptodate. We need to also zero-out the bitmap 2061 */ 2062 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 2063 2064 static inline int bitmap_uptodate(struct buffer_head *bh) 2065 { 2066 return (buffer_uptodate(bh) && 2067 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 2068 } 2069 static inline void set_bitmap_uptodate(struct buffer_head *bh) 2070 { 2071 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 2072 } 2073 2074 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 2075 2076 #endif /* __KERNEL__ */ 2077 2078 #endif /* _EXT4_H */ 2079