1 /* 2 * ext4.h 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/include/linux/minix_fs.h 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 */ 15 16 #ifndef _EXT4_H 17 #define _EXT4_H 18 19 #include <linux/types.h> 20 #include <linux/blkdev.h> 21 #include <linux/magic.h> 22 #include <linux/jbd2.h> 23 #include <linux/quota.h> 24 #include <linux/rwsem.h> 25 #include <linux/rbtree.h> 26 #include <linux/seqlock.h> 27 #include <linux/mutex.h> 28 #include <linux/timer.h> 29 #include <linux/wait.h> 30 #include <linux/blockgroup_lock.h> 31 #include <linux/percpu_counter.h> 32 #ifdef __KERNEL__ 33 #include <linux/compat.h> 34 #endif 35 36 /* 37 * The fourth extended filesystem constants/structures 38 */ 39 40 /* 41 * Define EXT4FS_DEBUG to produce debug messages 42 */ 43 #undef EXT4FS_DEBUG 44 45 /* 46 * Debug code 47 */ 48 #ifdef EXT4FS_DEBUG 49 #define ext4_debug(f, a...) \ 50 do { \ 51 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 52 __FILE__, __LINE__, __func__); \ 53 printk(KERN_DEBUG f, ## a); \ 54 } while (0) 55 #else 56 #define ext4_debug(f, a...) do {} while (0) 57 #endif 58 59 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 60 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 61 62 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 63 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 64 65 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 66 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 67 68 /* data type for block offset of block group */ 69 typedef int ext4_grpblk_t; 70 71 /* data type for filesystem-wide blocks number */ 72 typedef unsigned long long ext4_fsblk_t; 73 74 /* data type for file logical block number */ 75 typedef __u32 ext4_lblk_t; 76 77 /* data type for block group number */ 78 typedef unsigned int ext4_group_t; 79 80 /* 81 * Flags used in mballoc's allocation_context flags field. 82 * 83 * Also used to show what's going on for debugging purposes when the 84 * flag field is exported via the traceport interface 85 */ 86 87 /* prefer goal again. length */ 88 #define EXT4_MB_HINT_MERGE 0x0001 89 /* blocks already reserved */ 90 #define EXT4_MB_HINT_RESERVED 0x0002 91 /* metadata is being allocated */ 92 #define EXT4_MB_HINT_METADATA 0x0004 93 /* first blocks in the file */ 94 #define EXT4_MB_HINT_FIRST 0x0008 95 /* search for the best chunk */ 96 #define EXT4_MB_HINT_BEST 0x0010 97 /* data is being allocated */ 98 #define EXT4_MB_HINT_DATA 0x0020 99 /* don't preallocate (for tails) */ 100 #define EXT4_MB_HINT_NOPREALLOC 0x0040 101 /* allocate for locality group */ 102 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 103 /* allocate goal blocks or none */ 104 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 105 /* goal is meaningful */ 106 #define EXT4_MB_HINT_TRY_GOAL 0x0200 107 /* blocks already pre-reserved by delayed allocation */ 108 #define EXT4_MB_DELALLOC_RESERVED 0x0400 109 /* We are doing stream allocation */ 110 #define EXT4_MB_STREAM_ALLOC 0x0800 111 /* Use reserved root blocks if needed */ 112 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 113 114 struct ext4_allocation_request { 115 /* target inode for block we're allocating */ 116 struct inode *inode; 117 /* how many blocks we want to allocate */ 118 unsigned int len; 119 /* logical block in target inode */ 120 ext4_lblk_t logical; 121 /* the closest logical allocated block to the left */ 122 ext4_lblk_t lleft; 123 /* the closest logical allocated block to the right */ 124 ext4_lblk_t lright; 125 /* phys. target (a hint) */ 126 ext4_fsblk_t goal; 127 /* phys. block for the closest logical allocated block to the left */ 128 ext4_fsblk_t pleft; 129 /* phys. block for the closest logical allocated block to the right */ 130 ext4_fsblk_t pright; 131 /* flags. see above EXT4_MB_HINT_* */ 132 unsigned int flags; 133 }; 134 135 /* 136 * Logical to physical block mapping, used by ext4_map_blocks() 137 * 138 * This structure is used to pass requests into ext4_map_blocks() as 139 * well as to store the information returned by ext4_map_blocks(). It 140 * takes less room on the stack than a struct buffer_head. 141 */ 142 #define EXT4_MAP_NEW (1 << BH_New) 143 #define EXT4_MAP_MAPPED (1 << BH_Mapped) 144 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 145 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 146 #define EXT4_MAP_UNINIT (1 << BH_Uninit) 147 /* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of 148 * ext4_map_blocks wants to know whether or not the underlying cluster has 149 * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that 150 * the requested mapping was from previously mapped (or delayed allocated) 151 * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster 152 * should never appear on buffer_head's state flags. 153 */ 154 #define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster) 155 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 156 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\ 157 EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER) 158 159 struct ext4_map_blocks { 160 ext4_fsblk_t m_pblk; 161 ext4_lblk_t m_lblk; 162 unsigned int m_len; 163 unsigned int m_flags; 164 }; 165 166 /* 167 * For delayed allocation tracking 168 */ 169 struct mpage_da_data { 170 struct inode *inode; 171 sector_t b_blocknr; /* start block number of extent */ 172 size_t b_size; /* size of extent */ 173 unsigned long b_state; /* state of the extent */ 174 unsigned long first_page, next_page; /* extent of pages */ 175 struct writeback_control *wbc; 176 int io_done; 177 int pages_written; 178 int retval; 179 }; 180 181 /* 182 * Flags for ext4_io_end->flags 183 */ 184 #define EXT4_IO_END_UNWRITTEN 0x0001 185 #define EXT4_IO_END_ERROR 0x0002 186 #define EXT4_IO_END_QUEUED 0x0004 187 188 struct ext4_io_page { 189 struct page *p_page; 190 atomic_t p_count; 191 }; 192 193 #define MAX_IO_PAGES 128 194 195 typedef struct ext4_io_end { 196 struct list_head list; /* per-file finished IO list */ 197 struct inode *inode; /* file being written to */ 198 unsigned int flag; /* unwritten or not */ 199 struct page *page; /* page struct for buffer write */ 200 loff_t offset; /* offset in the file */ 201 ssize_t size; /* size of the extent */ 202 struct work_struct work; /* data work queue */ 203 struct kiocb *iocb; /* iocb struct for AIO */ 204 int result; /* error value for AIO */ 205 int num_io_pages; 206 struct ext4_io_page *pages[MAX_IO_PAGES]; 207 } ext4_io_end_t; 208 209 struct ext4_io_submit { 210 int io_op; 211 struct bio *io_bio; 212 ext4_io_end_t *io_end; 213 struct ext4_io_page *io_page; 214 sector_t io_next_block; 215 }; 216 217 /* 218 * Special inodes numbers 219 */ 220 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 221 #define EXT4_ROOT_INO 2 /* Root inode */ 222 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 223 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 224 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 225 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 226 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 227 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 228 229 /* First non-reserved inode for old ext4 filesystems */ 230 #define EXT4_GOOD_OLD_FIRST_INO 11 231 232 /* 233 * Maximal count of links to a file 234 */ 235 #define EXT4_LINK_MAX 65000 236 237 /* 238 * Macro-instructions used to manage several block sizes 239 */ 240 #define EXT4_MIN_BLOCK_SIZE 1024 241 #define EXT4_MAX_BLOCK_SIZE 65536 242 #define EXT4_MIN_BLOCK_LOG_SIZE 10 243 #define EXT4_MAX_BLOCK_LOG_SIZE 16 244 #ifdef __KERNEL__ 245 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 246 #else 247 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 248 #endif 249 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 250 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 251 EXT4_SB(s)->s_cluster_bits) 252 #ifdef __KERNEL__ 253 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 254 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 255 #else 256 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 257 #endif 258 #ifdef __KERNEL__ 259 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 260 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 261 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 262 #else 263 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 264 EXT4_GOOD_OLD_INODE_SIZE : \ 265 (s)->s_inode_size) 266 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 267 EXT4_GOOD_OLD_FIRST_INO : \ 268 (s)->s_first_ino) 269 #endif 270 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 271 272 /* Translate a block number to a cluster number */ 273 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 274 /* Translate a cluster number to a block number */ 275 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 276 /* Translate # of blks to # of clusters */ 277 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 278 (sbi)->s_cluster_bits) 279 280 /* 281 * Structure of a blocks group descriptor 282 */ 283 struct ext4_group_desc 284 { 285 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 286 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 287 __le32 bg_inode_table_lo; /* Inodes table block */ 288 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 289 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 290 __le16 bg_used_dirs_count_lo; /* Directories count */ 291 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 292 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ 293 __le16 bg_itable_unused_lo; /* Unused inodes count */ 294 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 295 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 296 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 297 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 298 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 299 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 300 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 301 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 302 __u32 bg_reserved2[3]; 303 }; 304 305 /* 306 * Structure of a flex block group info 307 */ 308 309 struct flex_groups { 310 atomic_t free_inodes; 311 atomic_t free_clusters; 312 atomic_t used_dirs; 313 }; 314 315 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 316 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 317 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 318 319 /* 320 * Macro-instructions used to manage group descriptors 321 */ 322 #define EXT4_MIN_DESC_SIZE 32 323 #define EXT4_MIN_DESC_SIZE_64BIT 64 324 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 325 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 326 #ifdef __KERNEL__ 327 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 328 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 329 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 330 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 331 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 332 #else 333 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 334 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 335 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 336 #endif 337 338 /* 339 * Constants relative to the data blocks 340 */ 341 #define EXT4_NDIR_BLOCKS 12 342 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 343 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 344 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 345 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 346 347 /* 348 * Inode flags 349 */ 350 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 351 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 352 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 353 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 354 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 355 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 356 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 357 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 358 /* Reserved for compression usage... */ 359 #define EXT4_DIRTY_FL 0x00000100 360 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 361 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 362 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 363 /* End compression flags --- maybe not all used */ 364 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 365 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 366 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 367 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 368 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 369 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 370 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 371 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 372 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 373 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 374 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 375 376 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 377 #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ 378 379 /* Flags that should be inherited by new inodes from their parent. */ 380 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 381 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 382 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 383 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 384 385 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 386 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 387 388 /* Flags that are appropriate for non-directories/regular files. */ 389 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 390 391 /* Mask out flags that are inappropriate for the given type of inode. */ 392 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 393 { 394 if (S_ISDIR(mode)) 395 return flags; 396 else if (S_ISREG(mode)) 397 return flags & EXT4_REG_FLMASK; 398 else 399 return flags & EXT4_OTHER_FLMASK; 400 } 401 402 /* 403 * Inode flags used for atomic set/get 404 */ 405 enum { 406 EXT4_INODE_SECRM = 0, /* Secure deletion */ 407 EXT4_INODE_UNRM = 1, /* Undelete */ 408 EXT4_INODE_COMPR = 2, /* Compress file */ 409 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 410 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 411 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 412 EXT4_INODE_NODUMP = 6, /* do not dump file */ 413 EXT4_INODE_NOATIME = 7, /* do not update atime */ 414 /* Reserved for compression usage... */ 415 EXT4_INODE_DIRTY = 8, 416 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 417 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 418 EXT4_INODE_ECOMPR = 11, /* Compression error */ 419 /* End compression flags --- maybe not all used */ 420 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 421 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 422 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 423 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 424 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 425 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 426 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 427 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 428 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 429 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 430 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 431 }; 432 433 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 434 #define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \ 435 printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \ 436 EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); } 437 438 /* 439 * Since it's pretty easy to mix up bit numbers and hex values, and we 440 * can't do a compile-time test for ENUM values, we use a run-time 441 * test to make sure that EXT4_XXX_FL is consistent with respect to 442 * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop 443 * out so it won't cost any extra space in the compiled kernel image. 444 * But it's important that these values are the same, since we are 445 * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL 446 * must be consistent with the values of FS_XXX_FL defined in 447 * include/linux/fs.h and the on-disk values found in ext2, ext3, and 448 * ext4 filesystems, and of course the values defined in e2fsprogs. 449 * 450 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 451 */ 452 static inline void ext4_check_flag_values(void) 453 { 454 CHECK_FLAG_VALUE(SECRM); 455 CHECK_FLAG_VALUE(UNRM); 456 CHECK_FLAG_VALUE(COMPR); 457 CHECK_FLAG_VALUE(SYNC); 458 CHECK_FLAG_VALUE(IMMUTABLE); 459 CHECK_FLAG_VALUE(APPEND); 460 CHECK_FLAG_VALUE(NODUMP); 461 CHECK_FLAG_VALUE(NOATIME); 462 CHECK_FLAG_VALUE(DIRTY); 463 CHECK_FLAG_VALUE(COMPRBLK); 464 CHECK_FLAG_VALUE(NOCOMPR); 465 CHECK_FLAG_VALUE(ECOMPR); 466 CHECK_FLAG_VALUE(INDEX); 467 CHECK_FLAG_VALUE(IMAGIC); 468 CHECK_FLAG_VALUE(JOURNAL_DATA); 469 CHECK_FLAG_VALUE(NOTAIL); 470 CHECK_FLAG_VALUE(DIRSYNC); 471 CHECK_FLAG_VALUE(TOPDIR); 472 CHECK_FLAG_VALUE(HUGE_FILE); 473 CHECK_FLAG_VALUE(EXTENTS); 474 CHECK_FLAG_VALUE(EA_INODE); 475 CHECK_FLAG_VALUE(EOFBLOCKS); 476 CHECK_FLAG_VALUE(RESERVED); 477 } 478 479 /* Used to pass group descriptor data when online resize is done */ 480 struct ext4_new_group_input { 481 __u32 group; /* Group number for this data */ 482 __u64 block_bitmap; /* Absolute block number of block bitmap */ 483 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 484 __u64 inode_table; /* Absolute block number of inode table start */ 485 __u32 blocks_count; /* Total number of blocks in this group */ 486 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 487 __u16 unused; 488 }; 489 490 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 491 struct compat_ext4_new_group_input { 492 u32 group; 493 compat_u64 block_bitmap; 494 compat_u64 inode_bitmap; 495 compat_u64 inode_table; 496 u32 blocks_count; 497 u16 reserved_blocks; 498 u16 unused; 499 }; 500 #endif 501 502 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 503 struct ext4_new_group_data { 504 __u32 group; 505 __u64 block_bitmap; 506 __u64 inode_bitmap; 507 __u64 inode_table; 508 __u32 blocks_count; 509 __u16 reserved_blocks; 510 __u16 unused; 511 __u32 free_blocks_count; 512 }; 513 514 /* 515 * Flags used by ext4_map_blocks() 516 */ 517 /* Allocate any needed blocks and/or convert an unitialized 518 extent to be an initialized ext4 */ 519 #define EXT4_GET_BLOCKS_CREATE 0x0001 520 /* Request the creation of an unitialized extent */ 521 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 522 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ 523 EXT4_GET_BLOCKS_CREATE) 524 /* Caller is from the delayed allocation writeout path, 525 so set the magic i_delalloc_reserve_flag after taking the 526 inode allocation semaphore for */ 527 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 528 /* caller is from the direct IO path, request to creation of an 529 unitialized extents if not allocated, split the uninitialized 530 extent if blocks has been preallocated already*/ 531 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 532 #define EXT4_GET_BLOCKS_CONVERT 0x0010 533 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 534 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 535 /* Convert extent to initialized after IO complete */ 536 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 537 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 538 /* Punch out blocks of an extent */ 539 #define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020 540 /* Don't normalize allocation size (used for fallocate) */ 541 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 542 /* Request will not result in inode size update (user for fallocate) */ 543 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 544 545 /* 546 * Flags used by ext4_free_blocks 547 */ 548 #define EXT4_FREE_BLOCKS_METADATA 0x0001 549 #define EXT4_FREE_BLOCKS_FORGET 0x0002 550 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 551 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 552 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 553 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 554 555 /* 556 * Flags used by ext4_discard_partial_page_buffers 557 */ 558 #define EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED 0x0001 559 560 /* 561 * ioctl commands 562 */ 563 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 564 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 565 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 566 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 567 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 568 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 569 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 570 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 571 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 572 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 573 #define EXT4_IOC_MIGRATE _IO('f', 9) 574 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 575 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 576 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 577 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 578 579 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 580 /* 581 * ioctl commands in 32 bit emulation 582 */ 583 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 584 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 585 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 586 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 587 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 588 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 589 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 590 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 591 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 592 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 593 #endif 594 595 /* Max physical block we can address w/o extents */ 596 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 597 598 /* 599 * Structure of an inode on the disk 600 */ 601 struct ext4_inode { 602 __le16 i_mode; /* File mode */ 603 __le16 i_uid; /* Low 16 bits of Owner Uid */ 604 __le32 i_size_lo; /* Size in bytes */ 605 __le32 i_atime; /* Access time */ 606 __le32 i_ctime; /* Inode Change time */ 607 __le32 i_mtime; /* Modification time */ 608 __le32 i_dtime; /* Deletion Time */ 609 __le16 i_gid; /* Low 16 bits of Group Id */ 610 __le16 i_links_count; /* Links count */ 611 __le32 i_blocks_lo; /* Blocks count */ 612 __le32 i_flags; /* File flags */ 613 union { 614 struct { 615 __le32 l_i_version; 616 } linux1; 617 struct { 618 __u32 h_i_translator; 619 } hurd1; 620 struct { 621 __u32 m_i_reserved1; 622 } masix1; 623 } osd1; /* OS dependent 1 */ 624 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 625 __le32 i_generation; /* File version (for NFS) */ 626 __le32 i_file_acl_lo; /* File ACL */ 627 __le32 i_size_high; 628 __le32 i_obso_faddr; /* Obsoleted fragment address */ 629 union { 630 struct { 631 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 632 __le16 l_i_file_acl_high; 633 __le16 l_i_uid_high; /* these 2 fields */ 634 __le16 l_i_gid_high; /* were reserved2[0] */ 635 __u32 l_i_reserved2; 636 } linux2; 637 struct { 638 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 639 __u16 h_i_mode_high; 640 __u16 h_i_uid_high; 641 __u16 h_i_gid_high; 642 __u32 h_i_author; 643 } hurd2; 644 struct { 645 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 646 __le16 m_i_file_acl_high; 647 __u32 m_i_reserved2[2]; 648 } masix2; 649 } osd2; /* OS dependent 2 */ 650 __le16 i_extra_isize; 651 __le16 i_pad1; 652 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 653 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 654 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 655 __le32 i_crtime; /* File Creation time */ 656 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 657 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 658 }; 659 660 struct move_extent { 661 __u32 reserved; /* should be zero */ 662 __u32 donor_fd; /* donor file descriptor */ 663 __u64 orig_start; /* logical start offset in block for orig */ 664 __u64 donor_start; /* logical start offset in block for donor */ 665 __u64 len; /* block length to be moved */ 666 __u64 moved_len; /* moved block length */ 667 }; 668 669 #define EXT4_EPOCH_BITS 2 670 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 671 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 672 673 /* 674 * Extended fields will fit into an inode if the filesystem was formatted 675 * with large inodes (-I 256 or larger) and there are not currently any EAs 676 * consuming all of the available space. For new inodes we always reserve 677 * enough space for the kernel's known extended fields, but for inodes 678 * created with an old kernel this might not have been the case. None of 679 * the extended inode fields is critical for correct filesystem operation. 680 * This macro checks if a certain field fits in the inode. Note that 681 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 682 */ 683 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 684 ((offsetof(typeof(*ext4_inode), field) + \ 685 sizeof((ext4_inode)->field)) \ 686 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 687 (einode)->i_extra_isize)) \ 688 689 static inline __le32 ext4_encode_extra_time(struct timespec *time) 690 { 691 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 692 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | 693 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); 694 } 695 696 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 697 { 698 if (sizeof(time->tv_sec) > 4) 699 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 700 << 32; 701 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 702 } 703 704 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 705 do { \ 706 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 707 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 708 (raw_inode)->xtime ## _extra = \ 709 ext4_encode_extra_time(&(inode)->xtime); \ 710 } while (0) 711 712 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 713 do { \ 714 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 715 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 716 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 717 (raw_inode)->xtime ## _extra = \ 718 ext4_encode_extra_time(&(einode)->xtime); \ 719 } while (0) 720 721 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 722 do { \ 723 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 724 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 725 ext4_decode_extra_time(&(inode)->xtime, \ 726 raw_inode->xtime ## _extra); \ 727 else \ 728 (inode)->xtime.tv_nsec = 0; \ 729 } while (0) 730 731 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 732 do { \ 733 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 734 (einode)->xtime.tv_sec = \ 735 (signed)le32_to_cpu((raw_inode)->xtime); \ 736 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 737 ext4_decode_extra_time(&(einode)->xtime, \ 738 raw_inode->xtime ## _extra); \ 739 else \ 740 (einode)->xtime.tv_nsec = 0; \ 741 } while (0) 742 743 #define i_disk_version osd1.linux1.l_i_version 744 745 #if defined(__KERNEL__) || defined(__linux__) 746 #define i_reserved1 osd1.linux1.l_i_reserved1 747 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 748 #define i_blocks_high osd2.linux2.l_i_blocks_high 749 #define i_uid_low i_uid 750 #define i_gid_low i_gid 751 #define i_uid_high osd2.linux2.l_i_uid_high 752 #define i_gid_high osd2.linux2.l_i_gid_high 753 #define i_reserved2 osd2.linux2.l_i_reserved2 754 755 #elif defined(__GNU__) 756 757 #define i_translator osd1.hurd1.h_i_translator 758 #define i_uid_high osd2.hurd2.h_i_uid_high 759 #define i_gid_high osd2.hurd2.h_i_gid_high 760 #define i_author osd2.hurd2.h_i_author 761 762 #elif defined(__masix__) 763 764 #define i_reserved1 osd1.masix1.m_i_reserved1 765 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 766 #define i_reserved2 osd2.masix2.m_i_reserved2 767 768 #endif /* defined(__KERNEL__) || defined(__linux__) */ 769 770 /* 771 * storage for cached extent 772 * If ec_len == 0, then the cache is invalid. 773 * If ec_start == 0, then the cache represents a gap (null mapping) 774 */ 775 struct ext4_ext_cache { 776 ext4_fsblk_t ec_start; 777 ext4_lblk_t ec_block; 778 __u32 ec_len; /* must be 32bit to return holes */ 779 }; 780 781 /* 782 * fourth extended file system inode data in memory 783 */ 784 struct ext4_inode_info { 785 __le32 i_data[15]; /* unconverted */ 786 __u32 i_dtime; 787 ext4_fsblk_t i_file_acl; 788 789 /* 790 * i_block_group is the number of the block group which contains 791 * this file's inode. Constant across the lifetime of the inode, 792 * it is ued for making block allocation decisions - we try to 793 * place a file's data blocks near its inode block, and new inodes 794 * near to their parent directory's inode. 795 */ 796 ext4_group_t i_block_group; 797 ext4_lblk_t i_dir_start_lookup; 798 #if (BITS_PER_LONG < 64) 799 unsigned long i_state_flags; /* Dynamic state flags */ 800 #endif 801 unsigned long i_flags; 802 803 #ifdef CONFIG_EXT4_FS_XATTR 804 /* 805 * Extended attributes can be read independently of the main file 806 * data. Taking i_mutex even when reading would cause contention 807 * between readers of EAs and writers of regular file data, so 808 * instead we synchronize on xattr_sem when reading or changing 809 * EAs. 810 */ 811 struct rw_semaphore xattr_sem; 812 #endif 813 814 struct list_head i_orphan; /* unlinked but open inodes */ 815 816 /* 817 * i_disksize keeps track of what the inode size is ON DISK, not 818 * in memory. During truncate, i_size is set to the new size by 819 * the VFS prior to calling ext4_truncate(), but the filesystem won't 820 * set i_disksize to 0 until the truncate is actually under way. 821 * 822 * The intent is that i_disksize always represents the blocks which 823 * are used by this file. This allows recovery to restart truncate 824 * on orphans if we crash during truncate. We actually write i_disksize 825 * into the on-disk inode when writing inodes out, instead of i_size. 826 * 827 * The only time when i_disksize and i_size may be different is when 828 * a truncate is in progress. The only things which change i_disksize 829 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 830 */ 831 loff_t i_disksize; 832 833 /* 834 * i_data_sem is for serialising ext4_truncate() against 835 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 836 * data tree are chopped off during truncate. We can't do that in 837 * ext4 because whenever we perform intermediate commits during 838 * truncate, the inode and all the metadata blocks *must* be in a 839 * consistent state which allows truncation of the orphans to restart 840 * during recovery. Hence we must fix the get_block-vs-truncate race 841 * by other means, so we have i_data_sem. 842 */ 843 struct rw_semaphore i_data_sem; 844 struct inode vfs_inode; 845 struct jbd2_inode *jinode; 846 847 struct ext4_ext_cache i_cached_extent; 848 /* 849 * File creation time. Its function is same as that of 850 * struct timespec i_{a,c,m}time in the generic inode. 851 */ 852 struct timespec i_crtime; 853 854 /* mballoc */ 855 struct list_head i_prealloc_list; 856 spinlock_t i_prealloc_lock; 857 858 /* ialloc */ 859 ext4_group_t i_last_alloc_group; 860 861 /* allocation reservation info for delalloc */ 862 /* In case of bigalloc, these refer to clusters rather than blocks */ 863 unsigned int i_reserved_data_blocks; 864 unsigned int i_reserved_meta_blocks; 865 unsigned int i_allocated_meta_blocks; 866 ext4_lblk_t i_da_metadata_calc_last_lblock; 867 int i_da_metadata_calc_len; 868 869 /* on-disk additional length */ 870 __u16 i_extra_isize; 871 872 #ifdef CONFIG_QUOTA 873 /* quota space reservation, managed internally by quota code */ 874 qsize_t i_reserved_quota; 875 #endif 876 877 /* completed IOs that might need unwritten extents handling */ 878 struct list_head i_completed_io_list; 879 spinlock_t i_completed_io_lock; 880 atomic_t i_ioend_count; /* Number of outstanding io_end structs */ 881 /* current io_end structure for async DIO write*/ 882 ext4_io_end_t *cur_aio_dio; 883 atomic_t i_aiodio_unwritten; /* Nr. of inflight conversions pending */ 884 885 spinlock_t i_block_reservation_lock; 886 887 /* 888 * Transactions that contain inode's metadata needed to complete 889 * fsync and fdatasync, respectively. 890 */ 891 tid_t i_sync_tid; 892 tid_t i_datasync_tid; 893 }; 894 895 /* 896 * File system states 897 */ 898 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 899 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 900 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 901 902 /* 903 * Misc. filesystem flags 904 */ 905 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 906 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 907 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 908 909 /* 910 * Mount flags 911 */ 912 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 913 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 914 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 915 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 916 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 917 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 918 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 919 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 920 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 921 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 922 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 923 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 924 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 925 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 926 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 927 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 928 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 929 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 930 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 931 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 932 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 933 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 934 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 935 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */ 936 #define EXT4_MOUNT_MBLK_IO_SUBMIT 0x4000000 /* multi-block io submits */ 937 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 938 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 939 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 940 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 941 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 942 943 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 944 specified delalloc */ 945 946 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 947 ~EXT4_MOUNT_##opt 948 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 949 EXT4_MOUNT_##opt 950 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 951 EXT4_MOUNT_##opt) 952 953 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 954 ~EXT4_MOUNT2_##opt 955 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 956 EXT4_MOUNT2_##opt 957 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 958 EXT4_MOUNT2_##opt) 959 960 #define ext4_set_bit __test_and_set_bit_le 961 #define ext4_set_bit_atomic ext2_set_bit_atomic 962 #define ext4_clear_bit __test_and_clear_bit_le 963 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 964 #define ext4_test_bit test_bit_le 965 #define ext4_find_first_zero_bit find_first_zero_bit_le 966 #define ext4_find_next_zero_bit find_next_zero_bit_le 967 #define ext4_find_next_bit find_next_bit_le 968 969 extern void ext4_set_bits(void *bm, int cur, int len); 970 971 /* 972 * Maximal mount counts between two filesystem checks 973 */ 974 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 975 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 976 977 /* 978 * Behaviour when detecting errors 979 */ 980 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 981 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 982 #define EXT4_ERRORS_PANIC 3 /* Panic */ 983 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 984 985 /* 986 * Structure of the super block 987 */ 988 struct ext4_super_block { 989 /*00*/ __le32 s_inodes_count; /* Inodes count */ 990 __le32 s_blocks_count_lo; /* Blocks count */ 991 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 992 __le32 s_free_blocks_count_lo; /* Free blocks count */ 993 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 994 __le32 s_first_data_block; /* First Data Block */ 995 __le32 s_log_block_size; /* Block size */ 996 __le32 s_log_cluster_size; /* Allocation cluster size */ 997 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 998 __le32 s_clusters_per_group; /* # Clusters per group */ 999 __le32 s_inodes_per_group; /* # Inodes per group */ 1000 __le32 s_mtime; /* Mount time */ 1001 /*30*/ __le32 s_wtime; /* Write time */ 1002 __le16 s_mnt_count; /* Mount count */ 1003 __le16 s_max_mnt_count; /* Maximal mount count */ 1004 __le16 s_magic; /* Magic signature */ 1005 __le16 s_state; /* File system state */ 1006 __le16 s_errors; /* Behaviour when detecting errors */ 1007 __le16 s_minor_rev_level; /* minor revision level */ 1008 /*40*/ __le32 s_lastcheck; /* time of last check */ 1009 __le32 s_checkinterval; /* max. time between checks */ 1010 __le32 s_creator_os; /* OS */ 1011 __le32 s_rev_level; /* Revision level */ 1012 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1013 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1014 /* 1015 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1016 * 1017 * Note: the difference between the compatible feature set and 1018 * the incompatible feature set is that if there is a bit set 1019 * in the incompatible feature set that the kernel doesn't 1020 * know about, it should refuse to mount the filesystem. 1021 * 1022 * e2fsck's requirements are more strict; if it doesn't know 1023 * about a feature in either the compatible or incompatible 1024 * feature set, it must abort and not try to meddle with 1025 * things it doesn't understand... 1026 */ 1027 __le32 s_first_ino; /* First non-reserved inode */ 1028 __le16 s_inode_size; /* size of inode structure */ 1029 __le16 s_block_group_nr; /* block group # of this superblock */ 1030 __le32 s_feature_compat; /* compatible feature set */ 1031 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1032 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1033 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1034 /*78*/ char s_volume_name[16]; /* volume name */ 1035 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 1036 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1037 /* 1038 * Performance hints. Directory preallocation should only 1039 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1040 */ 1041 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1042 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1043 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1044 /* 1045 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1046 */ 1047 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1048 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1049 __le32 s_journal_dev; /* device number of journal file */ 1050 __le32 s_last_orphan; /* start of list of inodes to delete */ 1051 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1052 __u8 s_def_hash_version; /* Default hash version to use */ 1053 __u8 s_jnl_backup_type; 1054 __le16 s_desc_size; /* size of group descriptor */ 1055 /*100*/ __le32 s_default_mount_opts; 1056 __le32 s_first_meta_bg; /* First metablock block group */ 1057 __le32 s_mkfs_time; /* When the filesystem was created */ 1058 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1059 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1060 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1061 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1062 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1063 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1064 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1065 __le32 s_flags; /* Miscellaneous flags */ 1066 __le16 s_raid_stride; /* RAID stride */ 1067 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1068 __le64 s_mmp_block; /* Block for multi-mount protection */ 1069 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1070 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1071 __u8 s_reserved_char_pad; 1072 __le16 s_reserved_pad; 1073 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1074 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1075 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1076 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1077 snapshot's future use */ 1078 __le32 s_snapshot_list; /* inode number of the head of the 1079 on-disk snapshot list */ 1080 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1081 __le32 s_error_count; /* number of fs errors */ 1082 __le32 s_first_error_time; /* first time an error happened */ 1083 __le32 s_first_error_ino; /* inode involved in first error */ 1084 __le64 s_first_error_block; /* block involved of first error */ 1085 __u8 s_first_error_func[32]; /* function where the error happened */ 1086 __le32 s_first_error_line; /* line number where error happened */ 1087 __le32 s_last_error_time; /* most recent time of an error */ 1088 __le32 s_last_error_ino; /* inode involved in last error */ 1089 __le32 s_last_error_line; /* line number where error happened */ 1090 __le64 s_last_error_block; /* block involved of last error */ 1091 __u8 s_last_error_func[32]; /* function where the error happened */ 1092 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1093 __u8 s_mount_opts[64]; 1094 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1095 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1096 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1097 __le32 s_reserved[109]; /* Padding to the end of the block */ 1098 }; 1099 1100 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1101 1102 #ifdef __KERNEL__ 1103 1104 /* 1105 * run-time mount flags 1106 */ 1107 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1108 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1109 1110 /* 1111 * fourth extended-fs super-block data in memory 1112 */ 1113 struct ext4_sb_info { 1114 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1115 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1116 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1117 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1118 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1119 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1120 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1121 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1122 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1123 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1124 unsigned long s_overhead_last; /* Last calculated overhead */ 1125 unsigned long s_blocks_last; /* Last seen block count */ 1126 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1127 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1128 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1129 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1130 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1131 struct buffer_head **s_group_desc; 1132 unsigned int s_mount_opt; 1133 unsigned int s_mount_opt2; 1134 unsigned int s_mount_flags; 1135 ext4_fsblk_t s_sb_block; 1136 uid_t s_resuid; 1137 gid_t s_resgid; 1138 unsigned short s_mount_state; 1139 unsigned short s_pad; 1140 int s_addr_per_block_bits; 1141 int s_desc_per_block_bits; 1142 int s_inode_size; 1143 int s_first_ino; 1144 unsigned int s_inode_readahead_blks; 1145 unsigned int s_inode_goal; 1146 spinlock_t s_next_gen_lock; 1147 u32 s_next_generation; 1148 u32 s_hash_seed[4]; 1149 int s_def_hash_version; 1150 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1151 struct percpu_counter s_freeclusters_counter; 1152 struct percpu_counter s_freeinodes_counter; 1153 struct percpu_counter s_dirs_counter; 1154 struct percpu_counter s_dirtyclusters_counter; 1155 struct blockgroup_lock *s_blockgroup_lock; 1156 struct proc_dir_entry *s_proc; 1157 struct kobject s_kobj; 1158 struct completion s_kobj_unregister; 1159 1160 /* Journaling */ 1161 struct journal_s *s_journal; 1162 struct list_head s_orphan; 1163 struct mutex s_orphan_lock; 1164 unsigned long s_resize_flags; /* Flags indicating if there 1165 is a resizer */ 1166 unsigned long s_commit_interval; 1167 u32 s_max_batch_time; 1168 u32 s_min_batch_time; 1169 struct block_device *journal_bdev; 1170 #ifdef CONFIG_QUOTA 1171 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ 1172 int s_jquota_fmt; /* Format of quota to use */ 1173 #endif 1174 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1175 struct rb_root system_blks; 1176 1177 #ifdef EXTENTS_STATS 1178 /* ext4 extents stats */ 1179 unsigned long s_ext_min; 1180 unsigned long s_ext_max; 1181 unsigned long s_depth_max; 1182 spinlock_t s_ext_stats_lock; 1183 unsigned long s_ext_blocks; 1184 unsigned long s_ext_extents; 1185 #endif 1186 /* ext4 extent cache stats */ 1187 unsigned long extent_cache_hits; 1188 unsigned long extent_cache_misses; 1189 1190 /* for buddy allocator */ 1191 struct ext4_group_info ***s_group_info; 1192 struct inode *s_buddy_cache; 1193 spinlock_t s_md_lock; 1194 unsigned short *s_mb_offsets; 1195 unsigned int *s_mb_maxs; 1196 1197 /* tunables */ 1198 unsigned long s_stripe; 1199 unsigned int s_mb_stream_request; 1200 unsigned int s_mb_max_to_scan; 1201 unsigned int s_mb_min_to_scan; 1202 unsigned int s_mb_stats; 1203 unsigned int s_mb_order2_reqs; 1204 unsigned int s_mb_group_prealloc; 1205 unsigned int s_max_writeback_mb_bump; 1206 /* where last allocation was done - for stream allocation */ 1207 unsigned long s_mb_last_group; 1208 unsigned long s_mb_last_start; 1209 1210 /* stats for buddy allocator */ 1211 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1212 atomic_t s_bal_success; /* we found long enough chunks */ 1213 atomic_t s_bal_allocated; /* in blocks */ 1214 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1215 atomic_t s_bal_goals; /* goal hits */ 1216 atomic_t s_bal_breaks; /* too long searches */ 1217 atomic_t s_bal_2orders; /* 2^order hits */ 1218 spinlock_t s_bal_lock; 1219 unsigned long s_mb_buddies_generated; 1220 unsigned long long s_mb_generation_time; 1221 atomic_t s_mb_lost_chunks; 1222 atomic_t s_mb_preallocated; 1223 atomic_t s_mb_discarded; 1224 atomic_t s_lock_busy; 1225 1226 /* locality groups */ 1227 struct ext4_locality_group __percpu *s_locality_groups; 1228 1229 /* for write statistics */ 1230 unsigned long s_sectors_written_start; 1231 u64 s_kbytes_written; 1232 1233 unsigned int s_log_groups_per_flex; 1234 struct flex_groups *s_flex_groups; 1235 1236 /* workqueue for dio unwritten */ 1237 struct workqueue_struct *dio_unwritten_wq; 1238 1239 /* timer for periodic error stats printing */ 1240 struct timer_list s_err_report; 1241 1242 /* Lazy inode table initialization info */ 1243 struct ext4_li_request *s_li_request; 1244 /* Wait multiplier for lazy initialization thread */ 1245 unsigned int s_li_wait_mult; 1246 1247 /* Kernel thread for multiple mount protection */ 1248 struct task_struct *s_mmp_tsk; 1249 1250 /* record the last minlen when FITRIM is called. */ 1251 atomic_t s_last_trim_minblks; 1252 }; 1253 1254 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1255 { 1256 return sb->s_fs_info; 1257 } 1258 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1259 { 1260 return container_of(inode, struct ext4_inode_info, vfs_inode); 1261 } 1262 1263 static inline struct timespec ext4_current_time(struct inode *inode) 1264 { 1265 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1266 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1267 } 1268 1269 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1270 { 1271 return ino == EXT4_ROOT_INO || 1272 ino == EXT4_JOURNAL_INO || 1273 ino == EXT4_RESIZE_INO || 1274 (ino >= EXT4_FIRST_INO(sb) && 1275 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1276 } 1277 1278 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 1279 struct ext4_io_end *io_end) 1280 { 1281 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 1282 io_end->flag |= EXT4_IO_END_UNWRITTEN; 1283 atomic_inc(&EXT4_I(inode)->i_aiodio_unwritten); 1284 } 1285 } 1286 1287 /* 1288 * Inode dynamic state flags 1289 */ 1290 enum { 1291 EXT4_STATE_JDATA, /* journaled data exists */ 1292 EXT4_STATE_NEW, /* inode is newly created */ 1293 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1294 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1295 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1296 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1297 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1298 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1299 EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */ 1300 }; 1301 1302 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1303 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1304 { \ 1305 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1306 } \ 1307 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1308 { \ 1309 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1310 } \ 1311 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1312 { \ 1313 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1314 } 1315 1316 EXT4_INODE_BIT_FNS(flag, flags, 0) 1317 #if (BITS_PER_LONG < 64) 1318 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1319 1320 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1321 { 1322 (ei)->i_state_flags = 0; 1323 } 1324 #else 1325 EXT4_INODE_BIT_FNS(state, flags, 32) 1326 1327 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1328 { 1329 /* We depend on the fact that callers will set i_flags */ 1330 } 1331 #endif 1332 #else 1333 /* Assume that user mode programs are passing in an ext4fs superblock, not 1334 * a kernel struct super_block. This will allow us to call the feature-test 1335 * macros from user land. */ 1336 #define EXT4_SB(sb) (sb) 1337 #endif 1338 1339 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1340 1341 /* 1342 * Codes for operating systems 1343 */ 1344 #define EXT4_OS_LINUX 0 1345 #define EXT4_OS_HURD 1 1346 #define EXT4_OS_MASIX 2 1347 #define EXT4_OS_FREEBSD 3 1348 #define EXT4_OS_LITES 4 1349 1350 /* 1351 * Revision levels 1352 */ 1353 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1354 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1355 1356 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1357 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1358 1359 #define EXT4_GOOD_OLD_INODE_SIZE 128 1360 1361 /* 1362 * Feature set definitions 1363 */ 1364 1365 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1366 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1367 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1368 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1369 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1370 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1371 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1372 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1373 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1374 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1375 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1376 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1377 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1378 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1379 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1380 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1381 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1382 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1383 1384 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1385 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1386 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1387 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1388 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1389 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1390 1391 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1392 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1393 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1394 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1395 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1396 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1397 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1398 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1399 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1400 1401 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1402 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1403 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1404 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1405 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1406 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1407 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1408 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1409 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1410 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1411 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1412 1413 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1414 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1415 EXT4_FEATURE_INCOMPAT_META_BG) 1416 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1417 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1418 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1419 1420 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1421 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1422 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1423 EXT4_FEATURE_INCOMPAT_META_BG) 1424 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1425 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1426 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1427 1428 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 1429 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1430 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1431 EXT4_FEATURE_INCOMPAT_META_BG| \ 1432 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1433 EXT4_FEATURE_INCOMPAT_64BIT| \ 1434 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1435 EXT4_FEATURE_INCOMPAT_MMP) 1436 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1437 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1438 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1439 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1440 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1441 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1442 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1443 EXT4_FEATURE_RO_COMPAT_BIGALLOC) 1444 1445 /* 1446 * Default values for user and/or group using reserved blocks 1447 */ 1448 #define EXT4_DEF_RESUID 0 1449 #define EXT4_DEF_RESGID 0 1450 1451 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1452 1453 /* 1454 * Default mount options 1455 */ 1456 #define EXT4_DEFM_DEBUG 0x0001 1457 #define EXT4_DEFM_BSDGROUPS 0x0002 1458 #define EXT4_DEFM_XATTR_USER 0x0004 1459 #define EXT4_DEFM_ACL 0x0008 1460 #define EXT4_DEFM_UID16 0x0010 1461 #define EXT4_DEFM_JMODE 0x0060 1462 #define EXT4_DEFM_JMODE_DATA 0x0020 1463 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1464 #define EXT4_DEFM_JMODE_WBACK 0x0060 1465 #define EXT4_DEFM_NOBARRIER 0x0100 1466 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1467 #define EXT4_DEFM_DISCARD 0x0400 1468 #define EXT4_DEFM_NODELALLOC 0x0800 1469 1470 /* 1471 * Default journal batch times 1472 */ 1473 #define EXT4_DEF_MIN_BATCH_TIME 0 1474 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1475 1476 /* 1477 * Minimum number of groups in a flexgroup before we separate out 1478 * directories into the first block group of a flexgroup 1479 */ 1480 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1481 1482 /* 1483 * Structure of a directory entry 1484 */ 1485 #define EXT4_NAME_LEN 255 1486 1487 struct ext4_dir_entry { 1488 __le32 inode; /* Inode number */ 1489 __le16 rec_len; /* Directory entry length */ 1490 __le16 name_len; /* Name length */ 1491 char name[EXT4_NAME_LEN]; /* File name */ 1492 }; 1493 1494 /* 1495 * The new version of the directory entry. Since EXT4 structures are 1496 * stored in intel byte order, and the name_len field could never be 1497 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1498 * file_type field. 1499 */ 1500 struct ext4_dir_entry_2 { 1501 __le32 inode; /* Inode number */ 1502 __le16 rec_len; /* Directory entry length */ 1503 __u8 name_len; /* Name length */ 1504 __u8 file_type; 1505 char name[EXT4_NAME_LEN]; /* File name */ 1506 }; 1507 1508 /* 1509 * Ext4 directory file types. Only the low 3 bits are used. The 1510 * other bits are reserved for now. 1511 */ 1512 #define EXT4_FT_UNKNOWN 0 1513 #define EXT4_FT_REG_FILE 1 1514 #define EXT4_FT_DIR 2 1515 #define EXT4_FT_CHRDEV 3 1516 #define EXT4_FT_BLKDEV 4 1517 #define EXT4_FT_FIFO 5 1518 #define EXT4_FT_SOCK 6 1519 #define EXT4_FT_SYMLINK 7 1520 1521 #define EXT4_FT_MAX 8 1522 1523 /* 1524 * EXT4_DIR_PAD defines the directory entries boundaries 1525 * 1526 * NOTE: It must be a multiple of 4 1527 */ 1528 #define EXT4_DIR_PAD 4 1529 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1530 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1531 ~EXT4_DIR_ROUND) 1532 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1533 1534 /* 1535 * If we ever get support for fs block sizes > page_size, we'll need 1536 * to remove the #if statements in the next two functions... 1537 */ 1538 static inline unsigned int 1539 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1540 { 1541 unsigned len = le16_to_cpu(dlen); 1542 1543 #if (PAGE_CACHE_SIZE >= 65536) 1544 if (len == EXT4_MAX_REC_LEN || len == 0) 1545 return blocksize; 1546 return (len & 65532) | ((len & 3) << 16); 1547 #else 1548 return len; 1549 #endif 1550 } 1551 1552 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1553 { 1554 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1555 BUG(); 1556 #if (PAGE_CACHE_SIZE >= 65536) 1557 if (len < 65536) 1558 return cpu_to_le16(len); 1559 if (len == blocksize) { 1560 if (blocksize == 65536) 1561 return cpu_to_le16(EXT4_MAX_REC_LEN); 1562 else 1563 return cpu_to_le16(0); 1564 } 1565 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 1566 #else 1567 return cpu_to_le16(len); 1568 #endif 1569 } 1570 1571 /* 1572 * Hash Tree Directory indexing 1573 * (c) Daniel Phillips, 2001 1574 */ 1575 1576 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 1577 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 1578 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 1579 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 1580 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 1581 1582 /* Legal values for the dx_root hash_version field: */ 1583 1584 #define DX_HASH_LEGACY 0 1585 #define DX_HASH_HALF_MD4 1 1586 #define DX_HASH_TEA 2 1587 #define DX_HASH_LEGACY_UNSIGNED 3 1588 #define DX_HASH_HALF_MD4_UNSIGNED 4 1589 #define DX_HASH_TEA_UNSIGNED 5 1590 1591 #ifdef __KERNEL__ 1592 1593 /* hash info structure used by the directory hash */ 1594 struct dx_hash_info 1595 { 1596 u32 hash; 1597 u32 minor_hash; 1598 int hash_version; 1599 u32 *seed; 1600 }; 1601 1602 #define EXT4_HTREE_EOF 0x7fffffff 1603 1604 /* 1605 * Control parameters used by ext4_htree_next_block 1606 */ 1607 #define HASH_NB_ALWAYS 1 1608 1609 1610 /* 1611 * Describe an inode's exact location on disk and in memory 1612 */ 1613 struct ext4_iloc 1614 { 1615 struct buffer_head *bh; 1616 unsigned long offset; 1617 ext4_group_t block_group; 1618 }; 1619 1620 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 1621 { 1622 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 1623 } 1624 1625 /* 1626 * This structure is stuffed into the struct file's private_data field 1627 * for directories. It is where we put information so that we can do 1628 * readdir operations in hash tree order. 1629 */ 1630 struct dir_private_info { 1631 struct rb_root root; 1632 struct rb_node *curr_node; 1633 struct fname *extra_fname; 1634 loff_t last_pos; 1635 __u32 curr_hash; 1636 __u32 curr_minor_hash; 1637 __u32 next_hash; 1638 }; 1639 1640 /* calculate the first block number of the group */ 1641 static inline ext4_fsblk_t 1642 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 1643 { 1644 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 1645 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 1646 } 1647 1648 /* 1649 * Special error return code only used by dx_probe() and its callers. 1650 */ 1651 #define ERR_BAD_DX_DIR -75000 1652 1653 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, 1654 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); 1655 1656 /* 1657 * Timeout and state flag for lazy initialization inode thread. 1658 */ 1659 #define EXT4_DEF_LI_WAIT_MULT 10 1660 #define EXT4_DEF_LI_MAX_START_DELAY 5 1661 #define EXT4_LAZYINIT_QUIT 0x0001 1662 #define EXT4_LAZYINIT_RUNNING 0x0002 1663 1664 /* 1665 * Lazy inode table initialization info 1666 */ 1667 struct ext4_lazy_init { 1668 unsigned long li_state; 1669 struct list_head li_request_list; 1670 struct mutex li_list_mtx; 1671 }; 1672 1673 struct ext4_li_request { 1674 struct super_block *lr_super; 1675 struct ext4_sb_info *lr_sbi; 1676 ext4_group_t lr_next_group; 1677 struct list_head lr_request; 1678 unsigned long lr_next_sched; 1679 unsigned long lr_timeout; 1680 }; 1681 1682 struct ext4_features { 1683 struct kobject f_kobj; 1684 struct completion f_kobj_unregister; 1685 }; 1686 1687 /* 1688 * This structure will be used for multiple mount protection. It will be 1689 * written into the block number saved in the s_mmp_block field in the 1690 * superblock. Programs that check MMP should assume that if 1691 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 1692 * to use the filesystem, regardless of how old the timestamp is. 1693 */ 1694 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 1695 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 1696 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 1697 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 1698 1699 struct mmp_struct { 1700 __le32 mmp_magic; /* Magic number for MMP */ 1701 __le32 mmp_seq; /* Sequence no. updated periodically */ 1702 1703 /* 1704 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 1705 * purposes and do not affect the correctness of the algorithm 1706 */ 1707 __le64 mmp_time; /* Time last updated */ 1708 char mmp_nodename[64]; /* Node which last updated MMP block */ 1709 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 1710 1711 /* 1712 * mmp_check_interval is used to verify if the MMP block has been 1713 * updated on the block device. The value is updated based on the 1714 * maximum time to write the MMP block during an update cycle. 1715 */ 1716 __le16 mmp_check_interval; 1717 1718 __le16 mmp_pad1; 1719 __le32 mmp_pad2[227]; 1720 }; 1721 1722 /* arguments passed to the mmp thread */ 1723 struct mmpd_data { 1724 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 1725 struct super_block *sb; /* super block of the fs */ 1726 }; 1727 1728 /* 1729 * Check interval multiplier 1730 * The MMP block is written every update interval and initially checked every 1731 * update interval x the multiplier (the value is then adapted based on the 1732 * write latency). The reason is that writes can be delayed under load and we 1733 * don't want readers to incorrectly assume that the filesystem is no longer 1734 * in use. 1735 */ 1736 #define EXT4_MMP_CHECK_MULT 2UL 1737 1738 /* 1739 * Minimum interval for MMP checking in seconds. 1740 */ 1741 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 1742 1743 /* 1744 * Maximum interval for MMP checking in seconds. 1745 */ 1746 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 1747 1748 /* 1749 * Function prototypes 1750 */ 1751 1752 /* 1753 * Ok, these declarations are also in <linux/kernel.h> but none of the 1754 * ext4 source programs needs to include it so they are duplicated here. 1755 */ 1756 # define NORET_TYPE /**/ 1757 # define ATTRIB_NORET __attribute__((noreturn)) 1758 # define NORET_AND noreturn, 1759 1760 /* bitmap.c */ 1761 extern unsigned int ext4_count_free(struct buffer_head *, unsigned); 1762 1763 /* balloc.c */ 1764 extern unsigned int ext4_block_group(struct super_block *sb, 1765 ext4_fsblk_t blocknr); 1766 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 1767 ext4_fsblk_t blocknr); 1768 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 1769 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 1770 ext4_group_t group); 1771 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 1772 ext4_fsblk_t goal, 1773 unsigned int flags, 1774 unsigned long *count, 1775 int *errp); 1776 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 1777 s64 nclusters, unsigned int flags); 1778 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 1779 extern void ext4_check_blocks_bitmap(struct super_block *); 1780 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 1781 ext4_group_t block_group, 1782 struct buffer_head ** bh); 1783 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1784 struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 1785 ext4_group_t block_group); 1786 extern void ext4_init_block_bitmap(struct super_block *sb, 1787 struct buffer_head *bh, 1788 ext4_group_t group, 1789 struct ext4_group_desc *desc); 1790 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 1791 ext4_group_t block_group, 1792 struct ext4_group_desc *gdp); 1793 extern unsigned ext4_num_base_meta_clusters(struct super_block *sb, 1794 ext4_group_t block_group); 1795 extern unsigned ext4_num_overhead_clusters(struct super_block *sb, 1796 ext4_group_t block_group, 1797 struct ext4_group_desc *gdp); 1798 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 1799 1800 /* dir.c */ 1801 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 1802 struct file *, 1803 struct ext4_dir_entry_2 *, 1804 struct buffer_head *, unsigned int); 1805 #define ext4_check_dir_entry(dir, filp, de, bh, offset) \ 1806 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 1807 (de), (bh), (offset))) 1808 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 1809 __u32 minor_hash, 1810 struct ext4_dir_entry_2 *dirent); 1811 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 1812 1813 /* fsync.c */ 1814 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 1815 extern int ext4_flush_completed_IO(struct inode *); 1816 1817 /* hash.c */ 1818 extern int ext4fs_dirhash(const char *name, int len, struct 1819 dx_hash_info *hinfo); 1820 1821 /* ialloc.c */ 1822 extern struct inode *ext4_new_inode(handle_t *, struct inode *, int, 1823 const struct qstr *qstr, __u32 goal, 1824 uid_t *owner); 1825 extern void ext4_free_inode(handle_t *, struct inode *); 1826 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 1827 extern unsigned long ext4_count_free_inodes(struct super_block *); 1828 extern unsigned long ext4_count_dirs(struct super_block *); 1829 extern void ext4_check_inodes_bitmap(struct super_block *); 1830 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 1831 extern int ext4_init_inode_table(struct super_block *sb, 1832 ext4_group_t group, int barrier); 1833 1834 /* mballoc.c */ 1835 extern long ext4_mb_stats; 1836 extern long ext4_mb_max_to_scan; 1837 extern int ext4_mb_init(struct super_block *, int); 1838 extern int ext4_mb_release(struct super_block *); 1839 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 1840 struct ext4_allocation_request *, int *); 1841 extern int ext4_mb_reserve_blocks(struct super_block *, int); 1842 extern void ext4_discard_preallocations(struct inode *); 1843 extern int __init ext4_init_mballoc(void); 1844 extern void ext4_exit_mballoc(void); 1845 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 1846 struct buffer_head *bh, ext4_fsblk_t block, 1847 unsigned long count, int flags); 1848 extern int ext4_mb_add_groupinfo(struct super_block *sb, 1849 ext4_group_t i, struct ext4_group_desc *desc); 1850 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 1851 ext4_fsblk_t block, unsigned long count); 1852 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 1853 1854 /* inode.c */ 1855 struct buffer_head *ext4_getblk(handle_t *, struct inode *, 1856 ext4_lblk_t, int, int *); 1857 struct buffer_head *ext4_bread(handle_t *, struct inode *, 1858 ext4_lblk_t, int, int *); 1859 int ext4_get_block(struct inode *inode, sector_t iblock, 1860 struct buffer_head *bh_result, int create); 1861 1862 extern struct inode *ext4_iget(struct super_block *, unsigned long); 1863 extern int ext4_write_inode(struct inode *, struct writeback_control *); 1864 extern int ext4_setattr(struct dentry *, struct iattr *); 1865 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 1866 struct kstat *stat); 1867 extern void ext4_evict_inode(struct inode *); 1868 extern void ext4_clear_inode(struct inode *); 1869 extern int ext4_sync_inode(handle_t *, struct inode *); 1870 extern void ext4_dirty_inode(struct inode *, int); 1871 extern int ext4_change_inode_journal_flag(struct inode *, int); 1872 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 1873 extern int ext4_can_truncate(struct inode *inode); 1874 extern void ext4_truncate(struct inode *); 1875 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length); 1876 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 1877 extern void ext4_set_inode_flags(struct inode *); 1878 extern void ext4_get_inode_flags(struct ext4_inode_info *); 1879 extern int ext4_alloc_da_blocks(struct inode *inode); 1880 extern void ext4_set_aops(struct inode *inode); 1881 extern int ext4_writepage_trans_blocks(struct inode *); 1882 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 1883 extern int ext4_block_truncate_page(handle_t *handle, 1884 struct address_space *mapping, loff_t from); 1885 extern int ext4_block_zero_page_range(handle_t *handle, 1886 struct address_space *mapping, loff_t from, loff_t length); 1887 extern int ext4_discard_partial_page_buffers(handle_t *handle, 1888 struct address_space *mapping, loff_t from, 1889 loff_t length, int flags); 1890 extern int ext4_discard_partial_page_buffers_no_lock(handle_t *handle, 1891 struct inode *inode, struct page *page, loff_t from, 1892 loff_t length, int flags); 1893 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 1894 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 1895 extern void ext4_da_update_reserve_space(struct inode *inode, 1896 int used, int quota_claim); 1897 1898 /* indirect.c */ 1899 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 1900 struct ext4_map_blocks *map, int flags); 1901 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb, 1902 const struct iovec *iov, loff_t offset, 1903 unsigned long nr_segs); 1904 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 1905 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk); 1906 extern void ext4_ind_truncate(struct inode *inode); 1907 1908 /* ioctl.c */ 1909 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 1910 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 1911 1912 /* migrate.c */ 1913 extern int ext4_ext_migrate(struct inode *); 1914 1915 /* namei.c */ 1916 extern int ext4_orphan_add(handle_t *, struct inode *); 1917 extern int ext4_orphan_del(handle_t *, struct inode *); 1918 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 1919 __u32 start_minor_hash, __u32 *next_hash); 1920 1921 /* resize.c */ 1922 extern int ext4_group_add(struct super_block *sb, 1923 struct ext4_new_group_data *input); 1924 extern int ext4_group_extend(struct super_block *sb, 1925 struct ext4_super_block *es, 1926 ext4_fsblk_t n_blocks_count); 1927 1928 /* super.c */ 1929 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 1930 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 1931 extern void ext4_kvfree(void *ptr); 1932 extern __printf(4, 5) 1933 void __ext4_error(struct super_block *, const char *, unsigned int, 1934 const char *, ...); 1935 #define ext4_error(sb, message...) __ext4_error(sb, __func__, \ 1936 __LINE__, ## message) 1937 extern __printf(5, 6) 1938 void ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 1939 const char *, ...); 1940 extern __printf(5, 6) 1941 void ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 1942 const char *, ...); 1943 extern void __ext4_std_error(struct super_block *, const char *, 1944 unsigned int, int); 1945 extern __printf(4, 5) 1946 void __ext4_abort(struct super_block *, const char *, unsigned int, 1947 const char *, ...); 1948 #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \ 1949 __LINE__, ## message) 1950 extern __printf(4, 5) 1951 void __ext4_warning(struct super_block *, const char *, unsigned int, 1952 const char *, ...); 1953 #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \ 1954 __LINE__, ## message) 1955 extern __printf(3, 4) 1956 void ext4_msg(struct super_block *, const char *, const char *, ...); 1957 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 1958 const char *, unsigned int, const char *); 1959 #define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \ 1960 __LINE__, msg) 1961 extern __printf(7, 8) 1962 void __ext4_grp_locked_error(const char *, unsigned int, 1963 struct super_block *, ext4_group_t, 1964 unsigned long, ext4_fsblk_t, 1965 const char *, ...); 1966 #define ext4_grp_locked_error(sb, grp, message...) \ 1967 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message) 1968 extern void ext4_update_dynamic_rev(struct super_block *sb); 1969 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 1970 __u32 compat); 1971 extern int ext4_update_rocompat_feature(handle_t *handle, 1972 struct super_block *sb, __u32 rocompat); 1973 extern int ext4_update_incompat_feature(handle_t *handle, 1974 struct super_block *sb, __u32 incompat); 1975 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 1976 struct ext4_group_desc *bg); 1977 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 1978 struct ext4_group_desc *bg); 1979 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 1980 struct ext4_group_desc *bg); 1981 extern __u32 ext4_free_group_clusters(struct super_block *sb, 1982 struct ext4_group_desc *bg); 1983 extern __u32 ext4_free_inodes_count(struct super_block *sb, 1984 struct ext4_group_desc *bg); 1985 extern __u32 ext4_used_dirs_count(struct super_block *sb, 1986 struct ext4_group_desc *bg); 1987 extern __u32 ext4_itable_unused_count(struct super_block *sb, 1988 struct ext4_group_desc *bg); 1989 extern void ext4_block_bitmap_set(struct super_block *sb, 1990 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1991 extern void ext4_inode_bitmap_set(struct super_block *sb, 1992 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1993 extern void ext4_inode_table_set(struct super_block *sb, 1994 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1995 extern void ext4_free_group_clusters_set(struct super_block *sb, 1996 struct ext4_group_desc *bg, 1997 __u32 count); 1998 extern void ext4_free_inodes_set(struct super_block *sb, 1999 struct ext4_group_desc *bg, __u32 count); 2000 extern void ext4_used_dirs_set(struct super_block *sb, 2001 struct ext4_group_desc *bg, __u32 count); 2002 extern void ext4_itable_unused_set(struct super_block *sb, 2003 struct ext4_group_desc *bg, __u32 count); 2004 extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group, 2005 struct ext4_group_desc *gdp); 2006 extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group, 2007 struct ext4_group_desc *gdp); 2008 2009 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2010 { 2011 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2012 le32_to_cpu(es->s_blocks_count_lo); 2013 } 2014 2015 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2016 { 2017 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2018 le32_to_cpu(es->s_r_blocks_count_lo); 2019 } 2020 2021 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2022 { 2023 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2024 le32_to_cpu(es->s_free_blocks_count_lo); 2025 } 2026 2027 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2028 ext4_fsblk_t blk) 2029 { 2030 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2031 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2032 } 2033 2034 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2035 ext4_fsblk_t blk) 2036 { 2037 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2038 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2039 } 2040 2041 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2042 ext4_fsblk_t blk) 2043 { 2044 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2045 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2046 } 2047 2048 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 2049 { 2050 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2051 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2052 le32_to_cpu(raw_inode->i_size_lo); 2053 else 2054 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2055 } 2056 2057 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2058 { 2059 raw_inode->i_size_lo = cpu_to_le32(i_size); 2060 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2061 } 2062 2063 static inline 2064 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2065 ext4_group_t group) 2066 { 2067 struct ext4_group_info ***grp_info; 2068 long indexv, indexh; 2069 grp_info = EXT4_SB(sb)->s_group_info; 2070 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2071 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2072 return grp_info[indexv][indexh]; 2073 } 2074 2075 /* 2076 * Reading s_groups_count requires using smp_rmb() afterwards. See 2077 * the locking protocol documented in the comments of ext4_group_add() 2078 * in resize.c 2079 */ 2080 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2081 { 2082 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2083 2084 smp_rmb(); 2085 return ngroups; 2086 } 2087 2088 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2089 ext4_group_t block_group) 2090 { 2091 return block_group >> sbi->s_log_groups_per_flex; 2092 } 2093 2094 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2095 { 2096 return 1 << sbi->s_log_groups_per_flex; 2097 } 2098 2099 #define ext4_std_error(sb, errno) \ 2100 do { \ 2101 if ((errno)) \ 2102 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2103 } while (0) 2104 2105 #ifdef CONFIG_SMP 2106 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2107 * counters. So we need to make sure we have free clusters more 2108 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2109 */ 2110 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2111 #else 2112 #define EXT4_FREECLUSTERS_WATERMARK 0 2113 #endif 2114 2115 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2116 { 2117 /* 2118 * XXX: replace with spinlock if seen contended -bzzz 2119 */ 2120 down_write(&EXT4_I(inode)->i_data_sem); 2121 if (newsize > EXT4_I(inode)->i_disksize) 2122 EXT4_I(inode)->i_disksize = newsize; 2123 up_write(&EXT4_I(inode)->i_data_sem); 2124 return ; 2125 } 2126 2127 struct ext4_group_info { 2128 unsigned long bb_state; 2129 struct rb_root bb_free_root; 2130 ext4_grpblk_t bb_first_free; /* first free block */ 2131 ext4_grpblk_t bb_free; /* total free blocks */ 2132 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 2133 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 2134 struct list_head bb_prealloc_list; 2135 #ifdef DOUBLE_CHECK 2136 void *bb_bitmap; 2137 #endif 2138 struct rw_semaphore alloc_sem; 2139 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2140 * regions, index is order. 2141 * bb_counters[3] = 5 means 2142 * 5 free 8-block regions. */ 2143 }; 2144 2145 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 2146 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 2147 2148 #define EXT4_MB_GRP_NEED_INIT(grp) \ 2149 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 2150 2151 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 2152 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2153 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 2154 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2155 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 2156 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2157 2158 #define EXT4_MAX_CONTENTION 8 2159 #define EXT4_CONTENTION_THRESHOLD 2 2160 2161 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2162 ext4_group_t group) 2163 { 2164 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2165 } 2166 2167 /* 2168 * Returns true if the filesystem is busy enough that attempts to 2169 * access the block group locks has run into contention. 2170 */ 2171 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 2172 { 2173 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 2174 } 2175 2176 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 2177 { 2178 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 2179 if (spin_trylock(lock)) 2180 /* 2181 * We're able to grab the lock right away, so drop the 2182 * lock contention counter. 2183 */ 2184 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 2185 else { 2186 /* 2187 * The lock is busy, so bump the contention counter, 2188 * and then wait on the spin lock. 2189 */ 2190 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 2191 EXT4_MAX_CONTENTION); 2192 spin_lock(lock); 2193 } 2194 } 2195 2196 static inline void ext4_unlock_group(struct super_block *sb, 2197 ext4_group_t group) 2198 { 2199 spin_unlock(ext4_group_lock_ptr(sb, group)); 2200 } 2201 2202 static inline void ext4_mark_super_dirty(struct super_block *sb) 2203 { 2204 if (EXT4_SB(sb)->s_journal == NULL) 2205 sb->s_dirt =1; 2206 } 2207 2208 /* 2209 * Block validity checking 2210 */ 2211 #define ext4_check_indirect_blockref(inode, bh) \ 2212 ext4_check_blockref(__func__, __LINE__, inode, \ 2213 (__le32 *)(bh)->b_data, \ 2214 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 2215 2216 #define ext4_ind_check_inode(inode) \ 2217 ext4_check_blockref(__func__, __LINE__, inode, \ 2218 EXT4_I(inode)->i_data, \ 2219 EXT4_NDIR_BLOCKS) 2220 2221 /* 2222 * Inodes and files operations 2223 */ 2224 2225 /* dir.c */ 2226 extern const struct file_operations ext4_dir_operations; 2227 2228 /* file.c */ 2229 extern const struct inode_operations ext4_file_inode_operations; 2230 extern const struct file_operations ext4_file_operations; 2231 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 2232 2233 /* namei.c */ 2234 extern const struct inode_operations ext4_dir_inode_operations; 2235 extern const struct inode_operations ext4_special_inode_operations; 2236 extern struct dentry *ext4_get_parent(struct dentry *child); 2237 2238 /* symlink.c */ 2239 extern const struct inode_operations ext4_symlink_inode_operations; 2240 extern const struct inode_operations ext4_fast_symlink_inode_operations; 2241 2242 /* block_validity */ 2243 extern void ext4_release_system_zone(struct super_block *sb); 2244 extern int ext4_setup_system_zone(struct super_block *sb); 2245 extern int __init ext4_init_system_zone(void); 2246 extern void ext4_exit_system_zone(void); 2247 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 2248 ext4_fsblk_t start_blk, 2249 unsigned int count); 2250 extern int ext4_check_blockref(const char *, unsigned int, 2251 struct inode *, __le32 *, unsigned int); 2252 2253 /* extents.c */ 2254 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 2255 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 2256 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, 2257 int chunk); 2258 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 2259 struct ext4_map_blocks *map, int flags); 2260 extern void ext4_ext_truncate(struct inode *); 2261 extern int ext4_ext_punch_hole(struct file *file, loff_t offset, 2262 loff_t length); 2263 extern void ext4_ext_init(struct super_block *); 2264 extern void ext4_ext_release(struct super_block *); 2265 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 2266 loff_t len); 2267 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset, 2268 ssize_t len); 2269 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 2270 struct ext4_map_blocks *map, int flags); 2271 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2272 __u64 start, __u64 len); 2273 /* move_extent.c */ 2274 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 2275 __u64 start_orig, __u64 start_donor, 2276 __u64 len, __u64 *moved_len); 2277 2278 /* page-io.c */ 2279 extern int __init ext4_init_pageio(void); 2280 extern void ext4_exit_pageio(void); 2281 extern void ext4_ioend_wait(struct inode *); 2282 extern void ext4_free_io_end(ext4_io_end_t *io); 2283 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 2284 extern int ext4_end_io_nolock(ext4_io_end_t *io); 2285 extern void ext4_io_submit(struct ext4_io_submit *io); 2286 extern int ext4_bio_write_page(struct ext4_io_submit *io, 2287 struct page *page, 2288 int len, 2289 struct writeback_control *wbc); 2290 2291 /* mmp.c */ 2292 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 2293 2294 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */ 2295 enum ext4_state_bits { 2296 BH_Uninit /* blocks are allocated but uninitialized on disk */ 2297 = BH_JBDPrivateStart, 2298 BH_AllocFromCluster, /* allocated blocks were part of already 2299 * allocated cluster. Note that this flag will 2300 * never, ever appear in a buffer_head's state 2301 * flag. See EXT4_MAP_FROM_CLUSTER to see where 2302 * this is used. */ 2303 BH_Da_Mapped, /* Delayed allocated block that now has a mapping. This 2304 * flag is set when ext4_map_blocks is called on a 2305 * delayed allocated block to get its real mapping. */ 2306 }; 2307 2308 BUFFER_FNS(Uninit, uninit) 2309 TAS_BUFFER_FNS(Uninit, uninit) 2310 BUFFER_FNS(Da_Mapped, da_mapped) 2311 2312 /* 2313 * Add new method to test wether block and inode bitmaps are properly 2314 * initialized. With uninit_bg reading the block from disk is not enough 2315 * to mark the bitmap uptodate. We need to also zero-out the bitmap 2316 */ 2317 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 2318 2319 static inline int bitmap_uptodate(struct buffer_head *bh) 2320 { 2321 return (buffer_uptodate(bh) && 2322 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 2323 } 2324 static inline void set_bitmap_uptodate(struct buffer_head *bh) 2325 { 2326 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 2327 } 2328 2329 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 2330 2331 /* For ioend & aio unwritten conversion wait queues */ 2332 #define EXT4_WQ_HASH_SZ 37 2333 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 2334 EXT4_WQ_HASH_SZ]) 2335 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\ 2336 EXT4_WQ_HASH_SZ]) 2337 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 2338 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; 2339 2340 #define EXT4_RESIZING 0 2341 extern int ext4_resize_begin(struct super_block *sb); 2342 extern void ext4_resize_end(struct super_block *sb); 2343 2344 #endif /* __KERNEL__ */ 2345 2346 #include "ext4_extents.h" 2347 2348 #endif /* _EXT4_H */ 2349