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 #include <crypto/hash.h> 33 #ifdef __KERNEL__ 34 #include <linux/compat.h> 35 #endif 36 37 /* 38 * The fourth extended filesystem constants/structures 39 */ 40 41 /* 42 * Define EXT4FS_DEBUG to produce debug messages 43 */ 44 #undef EXT4FS_DEBUG 45 46 /* 47 * Debug code 48 */ 49 #ifdef EXT4FS_DEBUG 50 #define ext4_debug(f, a...) \ 51 do { \ 52 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 53 __FILE__, __LINE__, __func__); \ 54 printk(KERN_DEBUG f, ## a); \ 55 } while (0) 56 #else 57 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 58 #endif 59 60 /* 61 * Turn on EXT_DEBUG to get lots of info about extents operations. 62 */ 63 #define EXT_DEBUG__ 64 #ifdef EXT_DEBUG 65 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__) 66 #else 67 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 68 #endif 69 70 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 71 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 72 73 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 74 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 75 76 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 77 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 78 79 /* data type for block offset of block group */ 80 typedef int ext4_grpblk_t; 81 82 /* data type for filesystem-wide blocks number */ 83 typedef unsigned long long ext4_fsblk_t; 84 85 /* data type for file logical block number */ 86 typedef __u32 ext4_lblk_t; 87 88 /* data type for block group number */ 89 typedef unsigned int ext4_group_t; 90 91 /* 92 * Flags used in mballoc's allocation_context flags field. 93 * 94 * Also used to show what's going on for debugging purposes when the 95 * flag field is exported via the traceport interface 96 */ 97 98 /* prefer goal again. length */ 99 #define EXT4_MB_HINT_MERGE 0x0001 100 /* blocks already reserved */ 101 #define EXT4_MB_HINT_RESERVED 0x0002 102 /* metadata is being allocated */ 103 #define EXT4_MB_HINT_METADATA 0x0004 104 /* first blocks in the file */ 105 #define EXT4_MB_HINT_FIRST 0x0008 106 /* search for the best chunk */ 107 #define EXT4_MB_HINT_BEST 0x0010 108 /* data is being allocated */ 109 #define EXT4_MB_HINT_DATA 0x0020 110 /* don't preallocate (for tails) */ 111 #define EXT4_MB_HINT_NOPREALLOC 0x0040 112 /* allocate for locality group */ 113 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 114 /* allocate goal blocks or none */ 115 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 116 /* goal is meaningful */ 117 #define EXT4_MB_HINT_TRY_GOAL 0x0200 118 /* blocks already pre-reserved by delayed allocation */ 119 #define EXT4_MB_DELALLOC_RESERVED 0x0400 120 /* We are doing stream allocation */ 121 #define EXT4_MB_STREAM_ALLOC 0x0800 122 /* Use reserved root blocks if needed */ 123 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 124 125 struct ext4_allocation_request { 126 /* target inode for block we're allocating */ 127 struct inode *inode; 128 /* how many blocks we want to allocate */ 129 unsigned int len; 130 /* logical block in target inode */ 131 ext4_lblk_t logical; 132 /* the closest logical allocated block to the left */ 133 ext4_lblk_t lleft; 134 /* the closest logical allocated block to the right */ 135 ext4_lblk_t lright; 136 /* phys. target (a hint) */ 137 ext4_fsblk_t goal; 138 /* phys. block for the closest logical allocated block to the left */ 139 ext4_fsblk_t pleft; 140 /* phys. block for the closest logical allocated block to the right */ 141 ext4_fsblk_t pright; 142 /* flags. see above EXT4_MB_HINT_* */ 143 unsigned int flags; 144 }; 145 146 /* 147 * Logical to physical block mapping, used by ext4_map_blocks() 148 * 149 * This structure is used to pass requests into ext4_map_blocks() as 150 * well as to store the information returned by ext4_map_blocks(). It 151 * takes less room on the stack than a struct buffer_head. 152 */ 153 #define EXT4_MAP_NEW (1 << BH_New) 154 #define EXT4_MAP_MAPPED (1 << BH_Mapped) 155 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 156 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 157 #define EXT4_MAP_UNINIT (1 << BH_Uninit) 158 /* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of 159 * ext4_map_blocks wants to know whether or not the underlying cluster has 160 * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that 161 * the requested mapping was from previously mapped (or delayed allocated) 162 * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster 163 * should never appear on buffer_head's state flags. 164 */ 165 #define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster) 166 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 167 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\ 168 EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER) 169 170 struct ext4_map_blocks { 171 ext4_fsblk_t m_pblk; 172 ext4_lblk_t m_lblk; 173 unsigned int m_len; 174 unsigned int m_flags; 175 }; 176 177 /* 178 * For delayed allocation tracking 179 */ 180 struct mpage_da_data { 181 struct inode *inode; 182 sector_t b_blocknr; /* start block number of extent */ 183 size_t b_size; /* size of extent */ 184 unsigned long b_state; /* state of the extent */ 185 unsigned long first_page, next_page; /* extent of pages */ 186 struct writeback_control *wbc; 187 int io_done; 188 int pages_written; 189 int retval; 190 }; 191 192 /* 193 * Flags for ext4_io_end->flags 194 */ 195 #define EXT4_IO_END_UNWRITTEN 0x0001 196 #define EXT4_IO_END_ERROR 0x0002 197 #define EXT4_IO_END_QUEUED 0x0004 198 #define EXT4_IO_END_DIRECT 0x0008 199 200 struct ext4_io_page { 201 struct page *p_page; 202 atomic_t p_count; 203 }; 204 205 #define MAX_IO_PAGES 128 206 207 /* 208 * For converting uninitialized extents on a work queue. 209 * 210 * 'page' is only used from the writepage() path; 'pages' is only used for 211 * buffered writes; they are used to keep page references until conversion 212 * takes place. For AIO/DIO, neither field is filled in. 213 */ 214 typedef struct ext4_io_end { 215 struct list_head list; /* per-file finished IO list */ 216 struct inode *inode; /* file being written to */ 217 unsigned int flag; /* unwritten or not */ 218 loff_t offset; /* offset in the file */ 219 ssize_t size; /* size of the extent */ 220 struct work_struct work; /* data work queue */ 221 struct kiocb *iocb; /* iocb struct for AIO */ 222 int result; /* error value for AIO */ 223 int num_io_pages; /* for writepages() */ 224 struct ext4_io_page *pages[MAX_IO_PAGES]; /* for writepages() */ 225 } ext4_io_end_t; 226 227 struct ext4_io_submit { 228 int io_op; 229 struct bio *io_bio; 230 ext4_io_end_t *io_end; 231 struct ext4_io_page *io_page; 232 sector_t io_next_block; 233 }; 234 235 /* 236 * Special inodes numbers 237 */ 238 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 239 #define EXT4_ROOT_INO 2 /* Root inode */ 240 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 241 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 242 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 243 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 244 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 245 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 246 247 /* First non-reserved inode for old ext4 filesystems */ 248 #define EXT4_GOOD_OLD_FIRST_INO 11 249 250 /* 251 * Maximal count of links to a file 252 */ 253 #define EXT4_LINK_MAX 65000 254 255 /* 256 * Macro-instructions used to manage several block sizes 257 */ 258 #define EXT4_MIN_BLOCK_SIZE 1024 259 #define EXT4_MAX_BLOCK_SIZE 65536 260 #define EXT4_MIN_BLOCK_LOG_SIZE 10 261 #define EXT4_MAX_BLOCK_LOG_SIZE 16 262 #ifdef __KERNEL__ 263 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 264 #else 265 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 266 #endif 267 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 268 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 269 EXT4_SB(s)->s_cluster_bits) 270 #ifdef __KERNEL__ 271 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 272 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 273 #else 274 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 275 #endif 276 #ifdef __KERNEL__ 277 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 278 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 279 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 280 #else 281 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 282 EXT4_GOOD_OLD_INODE_SIZE : \ 283 (s)->s_inode_size) 284 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 285 EXT4_GOOD_OLD_FIRST_INO : \ 286 (s)->s_first_ino) 287 #endif 288 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 289 290 /* Translate a block number to a cluster number */ 291 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 292 /* Translate a cluster number to a block number */ 293 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 294 /* Translate # of blks to # of clusters */ 295 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 296 (sbi)->s_cluster_bits) 297 298 /* 299 * Structure of a blocks group descriptor 300 */ 301 struct ext4_group_desc 302 { 303 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 304 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 305 __le32 bg_inode_table_lo; /* Inodes table block */ 306 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 307 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 308 __le16 bg_used_dirs_count_lo; /* Directories count */ 309 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 310 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 311 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 312 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 313 __le16 bg_itable_unused_lo; /* Unused inodes count */ 314 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 315 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 316 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 317 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 318 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 319 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 320 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 321 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 322 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 323 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 324 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 325 __u32 bg_reserved; 326 }; 327 328 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 329 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 330 sizeof(__le16)) 331 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 332 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 333 sizeof(__le16)) 334 335 /* 336 * Structure of a flex block group info 337 */ 338 339 struct flex_groups { 340 atomic_t free_inodes; 341 atomic_t free_clusters; 342 atomic_t used_dirs; 343 }; 344 345 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 346 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 347 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 348 349 /* 350 * Macro-instructions used to manage group descriptors 351 */ 352 #define EXT4_MIN_DESC_SIZE 32 353 #define EXT4_MIN_DESC_SIZE_64BIT 64 354 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 355 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 356 #ifdef __KERNEL__ 357 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 358 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 359 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 360 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 361 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 362 #else 363 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 364 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 365 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 366 #endif 367 368 /* 369 * Constants relative to the data blocks 370 */ 371 #define EXT4_NDIR_BLOCKS 12 372 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 373 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 374 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 375 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 376 377 /* 378 * Inode flags 379 */ 380 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 381 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 382 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 383 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 384 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 385 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 386 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 387 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 388 /* Reserved for compression usage... */ 389 #define EXT4_DIRTY_FL 0x00000100 390 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 391 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 392 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 393 /* End compression flags --- maybe not all used */ 394 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 395 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 396 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 397 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 398 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 399 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 400 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 401 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 402 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 403 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 404 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 405 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 406 407 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 408 #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ 409 410 /* Flags that should be inherited by new inodes from their parent. */ 411 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 412 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 413 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 414 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 415 416 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 417 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 418 419 /* Flags that are appropriate for non-directories/regular files. */ 420 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 421 422 /* Mask out flags that are inappropriate for the given type of inode. */ 423 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 424 { 425 if (S_ISDIR(mode)) 426 return flags; 427 else if (S_ISREG(mode)) 428 return flags & EXT4_REG_FLMASK; 429 else 430 return flags & EXT4_OTHER_FLMASK; 431 } 432 433 /* 434 * Inode flags used for atomic set/get 435 */ 436 enum { 437 EXT4_INODE_SECRM = 0, /* Secure deletion */ 438 EXT4_INODE_UNRM = 1, /* Undelete */ 439 EXT4_INODE_COMPR = 2, /* Compress file */ 440 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 441 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 442 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 443 EXT4_INODE_NODUMP = 6, /* do not dump file */ 444 EXT4_INODE_NOATIME = 7, /* do not update atime */ 445 /* Reserved for compression usage... */ 446 EXT4_INODE_DIRTY = 8, 447 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 448 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 449 EXT4_INODE_ECOMPR = 11, /* Compression error */ 450 /* End compression flags --- maybe not all used */ 451 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 452 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 453 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 454 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 455 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 456 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 457 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 458 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 459 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 460 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 461 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 462 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 463 }; 464 465 /* 466 * Since it's pretty easy to mix up bit numbers and hex values, we use a 467 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 468 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 469 * any extra space in the compiled kernel image, otherwise, the build will fail. 470 * It's important that these values are the same, since we are using 471 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 472 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 473 * values found in ext2, ext3 and ext4 filesystems, and of course the values 474 * defined in e2fsprogs. 475 * 476 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 477 */ 478 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 479 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 480 481 static inline void ext4_check_flag_values(void) 482 { 483 CHECK_FLAG_VALUE(SECRM); 484 CHECK_FLAG_VALUE(UNRM); 485 CHECK_FLAG_VALUE(COMPR); 486 CHECK_FLAG_VALUE(SYNC); 487 CHECK_FLAG_VALUE(IMMUTABLE); 488 CHECK_FLAG_VALUE(APPEND); 489 CHECK_FLAG_VALUE(NODUMP); 490 CHECK_FLAG_VALUE(NOATIME); 491 CHECK_FLAG_VALUE(DIRTY); 492 CHECK_FLAG_VALUE(COMPRBLK); 493 CHECK_FLAG_VALUE(NOCOMPR); 494 CHECK_FLAG_VALUE(ECOMPR); 495 CHECK_FLAG_VALUE(INDEX); 496 CHECK_FLAG_VALUE(IMAGIC); 497 CHECK_FLAG_VALUE(JOURNAL_DATA); 498 CHECK_FLAG_VALUE(NOTAIL); 499 CHECK_FLAG_VALUE(DIRSYNC); 500 CHECK_FLAG_VALUE(TOPDIR); 501 CHECK_FLAG_VALUE(HUGE_FILE); 502 CHECK_FLAG_VALUE(EXTENTS); 503 CHECK_FLAG_VALUE(EA_INODE); 504 CHECK_FLAG_VALUE(EOFBLOCKS); 505 CHECK_FLAG_VALUE(INLINE_DATA); 506 CHECK_FLAG_VALUE(RESERVED); 507 } 508 509 /* Used to pass group descriptor data when online resize is done */ 510 struct ext4_new_group_input { 511 __u32 group; /* Group number for this data */ 512 __u64 block_bitmap; /* Absolute block number of block bitmap */ 513 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 514 __u64 inode_table; /* Absolute block number of inode table start */ 515 __u32 blocks_count; /* Total number of blocks in this group */ 516 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 517 __u16 unused; 518 }; 519 520 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 521 struct compat_ext4_new_group_input { 522 u32 group; 523 compat_u64 block_bitmap; 524 compat_u64 inode_bitmap; 525 compat_u64 inode_table; 526 u32 blocks_count; 527 u16 reserved_blocks; 528 u16 unused; 529 }; 530 #endif 531 532 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 533 struct ext4_new_group_data { 534 __u32 group; 535 __u64 block_bitmap; 536 __u64 inode_bitmap; 537 __u64 inode_table; 538 __u32 blocks_count; 539 __u16 reserved_blocks; 540 __u16 unused; 541 __u32 free_blocks_count; 542 }; 543 544 /* Indexes used to index group tables in ext4_new_group_data */ 545 enum { 546 BLOCK_BITMAP = 0, /* block bitmap */ 547 INODE_BITMAP, /* inode bitmap */ 548 INODE_TABLE, /* inode tables */ 549 GROUP_TABLE_COUNT, 550 }; 551 552 /* 553 * Flags used by ext4_map_blocks() 554 */ 555 /* Allocate any needed blocks and/or convert an unitialized 556 extent to be an initialized ext4 */ 557 #define EXT4_GET_BLOCKS_CREATE 0x0001 558 /* Request the creation of an unitialized extent */ 559 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 560 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ 561 EXT4_GET_BLOCKS_CREATE) 562 /* Caller is from the delayed allocation writeout path, 563 so set the magic i_delalloc_reserve_flag after taking the 564 inode allocation semaphore for */ 565 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 566 /* caller is from the direct IO path, request to creation of an 567 unitialized extents if not allocated, split the uninitialized 568 extent if blocks has been preallocated already*/ 569 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 570 #define EXT4_GET_BLOCKS_CONVERT 0x0010 571 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 572 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 573 /* Convert extent to initialized after IO complete */ 574 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 575 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 576 /* Punch out blocks of an extent */ 577 #define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020 578 /* Don't normalize allocation size (used for fallocate) */ 579 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 580 /* Request will not result in inode size update (user for fallocate) */ 581 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 582 /* Do not take i_data_sem locking in ext4_map_blocks */ 583 #define EXT4_GET_BLOCKS_NO_LOCK 0x0100 584 585 /* 586 * Flags used by ext4_free_blocks 587 */ 588 #define EXT4_FREE_BLOCKS_METADATA 0x0001 589 #define EXT4_FREE_BLOCKS_FORGET 0x0002 590 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 591 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 592 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 593 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 594 595 /* 596 * Flags used by ext4_discard_partial_page_buffers 597 */ 598 #define EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED 0x0001 599 600 /* 601 * ioctl commands 602 */ 603 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 604 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 605 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 606 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 607 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 608 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 609 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 610 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 611 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 612 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 613 #define EXT4_IOC_MIGRATE _IO('f', 9) 614 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 615 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 616 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 617 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 618 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 619 620 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 621 /* 622 * ioctl commands in 32 bit emulation 623 */ 624 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 625 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 626 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 627 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 628 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 629 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 630 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 631 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 632 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 633 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 634 #endif 635 636 /* Max physical block we can address w/o extents */ 637 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 638 639 /* 640 * Structure of an inode on the disk 641 */ 642 struct ext4_inode { 643 __le16 i_mode; /* File mode */ 644 __le16 i_uid; /* Low 16 bits of Owner Uid */ 645 __le32 i_size_lo; /* Size in bytes */ 646 __le32 i_atime; /* Access time */ 647 __le32 i_ctime; /* Inode Change time */ 648 __le32 i_mtime; /* Modification time */ 649 __le32 i_dtime; /* Deletion Time */ 650 __le16 i_gid; /* Low 16 bits of Group Id */ 651 __le16 i_links_count; /* Links count */ 652 __le32 i_blocks_lo; /* Blocks count */ 653 __le32 i_flags; /* File flags */ 654 union { 655 struct { 656 __le32 l_i_version; 657 } linux1; 658 struct { 659 __u32 h_i_translator; 660 } hurd1; 661 struct { 662 __u32 m_i_reserved1; 663 } masix1; 664 } osd1; /* OS dependent 1 */ 665 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 666 __le32 i_generation; /* File version (for NFS) */ 667 __le32 i_file_acl_lo; /* File ACL */ 668 __le32 i_size_high; 669 __le32 i_obso_faddr; /* Obsoleted fragment address */ 670 union { 671 struct { 672 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 673 __le16 l_i_file_acl_high; 674 __le16 l_i_uid_high; /* these 2 fields */ 675 __le16 l_i_gid_high; /* were reserved2[0] */ 676 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 677 __le16 l_i_reserved; 678 } linux2; 679 struct { 680 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 681 __u16 h_i_mode_high; 682 __u16 h_i_uid_high; 683 __u16 h_i_gid_high; 684 __u32 h_i_author; 685 } hurd2; 686 struct { 687 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 688 __le16 m_i_file_acl_high; 689 __u32 m_i_reserved2[2]; 690 } masix2; 691 } osd2; /* OS dependent 2 */ 692 __le16 i_extra_isize; 693 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 694 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 695 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 696 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 697 __le32 i_crtime; /* File Creation time */ 698 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 699 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 700 }; 701 702 struct move_extent { 703 __u32 reserved; /* should be zero */ 704 __u32 donor_fd; /* donor file descriptor */ 705 __u64 orig_start; /* logical start offset in block for orig */ 706 __u64 donor_start; /* logical start offset in block for donor */ 707 __u64 len; /* block length to be moved */ 708 __u64 moved_len; /* moved block length */ 709 }; 710 711 #define EXT4_EPOCH_BITS 2 712 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 713 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 714 715 /* 716 * Extended fields will fit into an inode if the filesystem was formatted 717 * with large inodes (-I 256 or larger) and there are not currently any EAs 718 * consuming all of the available space. For new inodes we always reserve 719 * enough space for the kernel's known extended fields, but for inodes 720 * created with an old kernel this might not have been the case. None of 721 * the extended inode fields is critical for correct filesystem operation. 722 * This macro checks if a certain field fits in the inode. Note that 723 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 724 */ 725 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 726 ((offsetof(typeof(*ext4_inode), field) + \ 727 sizeof((ext4_inode)->field)) \ 728 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 729 (einode)->i_extra_isize)) \ 730 731 static inline __le32 ext4_encode_extra_time(struct timespec *time) 732 { 733 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 734 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | 735 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); 736 } 737 738 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 739 { 740 if (sizeof(time->tv_sec) > 4) 741 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 742 << 32; 743 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 744 } 745 746 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 747 do { \ 748 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 749 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 750 (raw_inode)->xtime ## _extra = \ 751 ext4_encode_extra_time(&(inode)->xtime); \ 752 } while (0) 753 754 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 755 do { \ 756 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 757 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 758 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 759 (raw_inode)->xtime ## _extra = \ 760 ext4_encode_extra_time(&(einode)->xtime); \ 761 } while (0) 762 763 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 764 do { \ 765 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 766 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 767 ext4_decode_extra_time(&(inode)->xtime, \ 768 raw_inode->xtime ## _extra); \ 769 else \ 770 (inode)->xtime.tv_nsec = 0; \ 771 } while (0) 772 773 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 774 do { \ 775 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 776 (einode)->xtime.tv_sec = \ 777 (signed)le32_to_cpu((raw_inode)->xtime); \ 778 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 779 ext4_decode_extra_time(&(einode)->xtime, \ 780 raw_inode->xtime ## _extra); \ 781 else \ 782 (einode)->xtime.tv_nsec = 0; \ 783 } while (0) 784 785 #define i_disk_version osd1.linux1.l_i_version 786 787 #if defined(__KERNEL__) || defined(__linux__) 788 #define i_reserved1 osd1.linux1.l_i_reserved1 789 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 790 #define i_blocks_high osd2.linux2.l_i_blocks_high 791 #define i_uid_low i_uid 792 #define i_gid_low i_gid 793 #define i_uid_high osd2.linux2.l_i_uid_high 794 #define i_gid_high osd2.linux2.l_i_gid_high 795 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 796 797 #elif defined(__GNU__) 798 799 #define i_translator osd1.hurd1.h_i_translator 800 #define i_uid_high osd2.hurd2.h_i_uid_high 801 #define i_gid_high osd2.hurd2.h_i_gid_high 802 #define i_author osd2.hurd2.h_i_author 803 804 #elif defined(__masix__) 805 806 #define i_reserved1 osd1.masix1.m_i_reserved1 807 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 808 #define i_reserved2 osd2.masix2.m_i_reserved2 809 810 #endif /* defined(__KERNEL__) || defined(__linux__) */ 811 812 /* 813 * storage for cached extent 814 * If ec_len == 0, then the cache is invalid. 815 * If ec_start == 0, then the cache represents a gap (null mapping) 816 */ 817 struct ext4_ext_cache { 818 ext4_fsblk_t ec_start; 819 ext4_lblk_t ec_block; 820 __u32 ec_len; /* must be 32bit to return holes */ 821 }; 822 823 #include "extents_status.h" 824 825 /* 826 * fourth extended file system inode data in memory 827 */ 828 struct ext4_inode_info { 829 __le32 i_data[15]; /* unconverted */ 830 __u32 i_dtime; 831 ext4_fsblk_t i_file_acl; 832 833 /* 834 * i_block_group is the number of the block group which contains 835 * this file's inode. Constant across the lifetime of the inode, 836 * it is ued for making block allocation decisions - we try to 837 * place a file's data blocks near its inode block, and new inodes 838 * near to their parent directory's inode. 839 */ 840 ext4_group_t i_block_group; 841 ext4_lblk_t i_dir_start_lookup; 842 #if (BITS_PER_LONG < 64) 843 unsigned long i_state_flags; /* Dynamic state flags */ 844 #endif 845 unsigned long i_flags; 846 847 /* 848 * Extended attributes can be read independently of the main file 849 * data. Taking i_mutex even when reading would cause contention 850 * between readers of EAs and writers of regular file data, so 851 * instead we synchronize on xattr_sem when reading or changing 852 * EAs. 853 */ 854 struct rw_semaphore xattr_sem; 855 856 struct list_head i_orphan; /* unlinked but open inodes */ 857 858 /* 859 * i_disksize keeps track of what the inode size is ON DISK, not 860 * in memory. During truncate, i_size is set to the new size by 861 * the VFS prior to calling ext4_truncate(), but the filesystem won't 862 * set i_disksize to 0 until the truncate is actually under way. 863 * 864 * The intent is that i_disksize always represents the blocks which 865 * are used by this file. This allows recovery to restart truncate 866 * on orphans if we crash during truncate. We actually write i_disksize 867 * into the on-disk inode when writing inodes out, instead of i_size. 868 * 869 * The only time when i_disksize and i_size may be different is when 870 * a truncate is in progress. The only things which change i_disksize 871 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 872 */ 873 loff_t i_disksize; 874 875 /* 876 * i_data_sem is for serialising ext4_truncate() against 877 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 878 * data tree are chopped off during truncate. We can't do that in 879 * ext4 because whenever we perform intermediate commits during 880 * truncate, the inode and all the metadata blocks *must* be in a 881 * consistent state which allows truncation of the orphans to restart 882 * during recovery. Hence we must fix the get_block-vs-truncate race 883 * by other means, so we have i_data_sem. 884 */ 885 struct rw_semaphore i_data_sem; 886 struct inode vfs_inode; 887 struct jbd2_inode *jinode; 888 889 struct ext4_ext_cache i_cached_extent; 890 /* 891 * File creation time. Its function is same as that of 892 * struct timespec i_{a,c,m}time in the generic inode. 893 */ 894 struct timespec i_crtime; 895 896 /* mballoc */ 897 struct list_head i_prealloc_list; 898 spinlock_t i_prealloc_lock; 899 900 /* extents status tree */ 901 struct ext4_es_tree i_es_tree; 902 rwlock_t i_es_lock; 903 904 /* ialloc */ 905 ext4_group_t i_last_alloc_group; 906 907 /* allocation reservation info for delalloc */ 908 /* In case of bigalloc, these refer to clusters rather than blocks */ 909 unsigned int i_reserved_data_blocks; 910 unsigned int i_reserved_meta_blocks; 911 unsigned int i_allocated_meta_blocks; 912 ext4_lblk_t i_da_metadata_calc_last_lblock; 913 int i_da_metadata_calc_len; 914 915 /* on-disk additional length */ 916 __u16 i_extra_isize; 917 918 /* Indicate the inline data space. */ 919 u16 i_inline_off; 920 u16 i_inline_size; 921 922 #ifdef CONFIG_QUOTA 923 /* quota space reservation, managed internally by quota code */ 924 qsize_t i_reserved_quota; 925 #endif 926 927 /* completed IOs that might need unwritten extents handling */ 928 struct list_head i_completed_io_list; 929 spinlock_t i_completed_io_lock; 930 atomic_t i_ioend_count; /* Number of outstanding io_end structs */ 931 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 932 933 spinlock_t i_block_reservation_lock; 934 935 /* 936 * Transactions that contain inode's metadata needed to complete 937 * fsync and fdatasync, respectively. 938 */ 939 tid_t i_sync_tid; 940 tid_t i_datasync_tid; 941 942 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 943 __u32 i_csum_seed; 944 }; 945 946 /* 947 * File system states 948 */ 949 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 950 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 951 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 952 953 /* 954 * Misc. filesystem flags 955 */ 956 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 957 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 958 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 959 960 /* 961 * Mount flags 962 */ 963 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 964 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 965 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 966 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 967 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 968 #define EXT4_MOUNT_ERRORS_MASK 0x00070 969 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 970 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 971 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 972 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 973 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 974 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 975 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 976 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 977 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 978 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 979 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 980 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 981 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 982 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 983 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 984 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 985 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 986 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 987 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 988 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 989 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 990 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 991 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 992 993 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 994 specified delalloc */ 995 996 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 997 ~EXT4_MOUNT_##opt 998 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 999 EXT4_MOUNT_##opt 1000 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1001 EXT4_MOUNT_##opt) 1002 1003 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1004 ~EXT4_MOUNT2_##opt 1005 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1006 EXT4_MOUNT2_##opt 1007 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1008 EXT4_MOUNT2_##opt) 1009 1010 #define ext4_test_and_set_bit __test_and_set_bit_le 1011 #define ext4_set_bit __set_bit_le 1012 #define ext4_set_bit_atomic ext2_set_bit_atomic 1013 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1014 #define ext4_clear_bit __clear_bit_le 1015 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1016 #define ext4_test_bit test_bit_le 1017 #define ext4_find_next_zero_bit find_next_zero_bit_le 1018 #define ext4_find_next_bit find_next_bit_le 1019 1020 extern void ext4_set_bits(void *bm, int cur, int len); 1021 1022 /* 1023 * Maximal mount counts between two filesystem checks 1024 */ 1025 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1026 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1027 1028 /* 1029 * Behaviour when detecting errors 1030 */ 1031 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1032 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1033 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1034 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1035 1036 /* Metadata checksum algorithm codes */ 1037 #define EXT4_CRC32C_CHKSUM 1 1038 1039 /* 1040 * Structure of the super block 1041 */ 1042 struct ext4_super_block { 1043 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1044 __le32 s_blocks_count_lo; /* Blocks count */ 1045 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1046 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1047 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1048 __le32 s_first_data_block; /* First Data Block */ 1049 __le32 s_log_block_size; /* Block size */ 1050 __le32 s_log_cluster_size; /* Allocation cluster size */ 1051 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1052 __le32 s_clusters_per_group; /* # Clusters per group */ 1053 __le32 s_inodes_per_group; /* # Inodes per group */ 1054 __le32 s_mtime; /* Mount time */ 1055 /*30*/ __le32 s_wtime; /* Write time */ 1056 __le16 s_mnt_count; /* Mount count */ 1057 __le16 s_max_mnt_count; /* Maximal mount count */ 1058 __le16 s_magic; /* Magic signature */ 1059 __le16 s_state; /* File system state */ 1060 __le16 s_errors; /* Behaviour when detecting errors */ 1061 __le16 s_minor_rev_level; /* minor revision level */ 1062 /*40*/ __le32 s_lastcheck; /* time of last check */ 1063 __le32 s_checkinterval; /* max. time between checks */ 1064 __le32 s_creator_os; /* OS */ 1065 __le32 s_rev_level; /* Revision level */ 1066 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1067 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1068 /* 1069 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1070 * 1071 * Note: the difference between the compatible feature set and 1072 * the incompatible feature set is that if there is a bit set 1073 * in the incompatible feature set that the kernel doesn't 1074 * know about, it should refuse to mount the filesystem. 1075 * 1076 * e2fsck's requirements are more strict; if it doesn't know 1077 * about a feature in either the compatible or incompatible 1078 * feature set, it must abort and not try to meddle with 1079 * things it doesn't understand... 1080 */ 1081 __le32 s_first_ino; /* First non-reserved inode */ 1082 __le16 s_inode_size; /* size of inode structure */ 1083 __le16 s_block_group_nr; /* block group # of this superblock */ 1084 __le32 s_feature_compat; /* compatible feature set */ 1085 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1086 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1087 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1088 /*78*/ char s_volume_name[16]; /* volume name */ 1089 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 1090 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1091 /* 1092 * Performance hints. Directory preallocation should only 1093 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1094 */ 1095 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1096 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1097 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1098 /* 1099 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1100 */ 1101 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1102 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1103 __le32 s_journal_dev; /* device number of journal file */ 1104 __le32 s_last_orphan; /* start of list of inodes to delete */ 1105 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1106 __u8 s_def_hash_version; /* Default hash version to use */ 1107 __u8 s_jnl_backup_type; 1108 __le16 s_desc_size; /* size of group descriptor */ 1109 /*100*/ __le32 s_default_mount_opts; 1110 __le32 s_first_meta_bg; /* First metablock block group */ 1111 __le32 s_mkfs_time; /* When the filesystem was created */ 1112 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1113 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1114 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1115 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1116 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1117 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1118 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1119 __le32 s_flags; /* Miscellaneous flags */ 1120 __le16 s_raid_stride; /* RAID stride */ 1121 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1122 __le64 s_mmp_block; /* Block for multi-mount protection */ 1123 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1124 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1125 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1126 __le16 s_reserved_pad; 1127 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1128 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1129 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1130 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1131 snapshot's future use */ 1132 __le32 s_snapshot_list; /* inode number of the head of the 1133 on-disk snapshot list */ 1134 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1135 __le32 s_error_count; /* number of fs errors */ 1136 __le32 s_first_error_time; /* first time an error happened */ 1137 __le32 s_first_error_ino; /* inode involved in first error */ 1138 __le64 s_first_error_block; /* block involved of first error */ 1139 __u8 s_first_error_func[32]; /* function where the error happened */ 1140 __le32 s_first_error_line; /* line number where error happened */ 1141 __le32 s_last_error_time; /* most recent time of an error */ 1142 __le32 s_last_error_ino; /* inode involved in last error */ 1143 __le32 s_last_error_line; /* line number where error happened */ 1144 __le64 s_last_error_block; /* block involved of last error */ 1145 __u8 s_last_error_func[32]; /* function where the error happened */ 1146 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1147 __u8 s_mount_opts[64]; 1148 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1149 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1150 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1151 __le32 s_reserved[108]; /* Padding to the end of the block */ 1152 __le32 s_checksum; /* crc32c(superblock) */ 1153 }; 1154 1155 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1156 1157 #ifdef __KERNEL__ 1158 1159 /* 1160 * run-time mount flags 1161 */ 1162 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1163 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1164 1165 /* 1166 * fourth extended-fs super-block data in memory 1167 */ 1168 struct ext4_sb_info { 1169 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1170 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1171 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1172 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1173 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1174 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1175 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1176 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1177 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1178 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1179 unsigned long s_overhead; /* # of fs overhead clusters */ 1180 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1181 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1182 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1183 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1184 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1185 struct buffer_head **s_group_desc; 1186 unsigned int s_mount_opt; 1187 unsigned int s_mount_opt2; 1188 unsigned int s_mount_flags; 1189 unsigned int s_def_mount_opt; 1190 ext4_fsblk_t s_sb_block; 1191 kuid_t s_resuid; 1192 kgid_t s_resgid; 1193 unsigned short s_mount_state; 1194 unsigned short s_pad; 1195 int s_addr_per_block_bits; 1196 int s_desc_per_block_bits; 1197 int s_inode_size; 1198 int s_first_ino; 1199 unsigned int s_inode_readahead_blks; 1200 unsigned int s_inode_goal; 1201 spinlock_t s_next_gen_lock; 1202 u32 s_next_generation; 1203 u32 s_hash_seed[4]; 1204 int s_def_hash_version; 1205 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1206 struct percpu_counter s_freeclusters_counter; 1207 struct percpu_counter s_freeinodes_counter; 1208 struct percpu_counter s_dirs_counter; 1209 struct percpu_counter s_dirtyclusters_counter; 1210 struct blockgroup_lock *s_blockgroup_lock; 1211 struct proc_dir_entry *s_proc; 1212 struct kobject s_kobj; 1213 struct completion s_kobj_unregister; 1214 struct super_block *s_sb; 1215 1216 /* Journaling */ 1217 struct journal_s *s_journal; 1218 struct list_head s_orphan; 1219 struct mutex s_orphan_lock; 1220 unsigned long s_resize_flags; /* Flags indicating if there 1221 is a resizer */ 1222 unsigned long s_commit_interval; 1223 u32 s_max_batch_time; 1224 u32 s_min_batch_time; 1225 struct block_device *journal_bdev; 1226 #ifdef CONFIG_QUOTA 1227 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ 1228 int s_jquota_fmt; /* Format of quota to use */ 1229 #endif 1230 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1231 struct rb_root system_blks; 1232 1233 #ifdef EXTENTS_STATS 1234 /* ext4 extents stats */ 1235 unsigned long s_ext_min; 1236 unsigned long s_ext_max; 1237 unsigned long s_depth_max; 1238 spinlock_t s_ext_stats_lock; 1239 unsigned long s_ext_blocks; 1240 unsigned long s_ext_extents; 1241 #endif 1242 1243 /* for buddy allocator */ 1244 struct ext4_group_info ***s_group_info; 1245 struct inode *s_buddy_cache; 1246 spinlock_t s_md_lock; 1247 unsigned short *s_mb_offsets; 1248 unsigned int *s_mb_maxs; 1249 unsigned int s_group_info_size; 1250 1251 /* tunables */ 1252 unsigned long s_stripe; 1253 unsigned int s_mb_stream_request; 1254 unsigned int s_mb_max_to_scan; 1255 unsigned int s_mb_min_to_scan; 1256 unsigned int s_mb_stats; 1257 unsigned int s_mb_order2_reqs; 1258 unsigned int s_mb_group_prealloc; 1259 unsigned int s_max_writeback_mb_bump; 1260 unsigned int s_max_dir_size_kb; 1261 /* where last allocation was done - for stream allocation */ 1262 unsigned long s_mb_last_group; 1263 unsigned long s_mb_last_start; 1264 1265 /* stats for buddy allocator */ 1266 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1267 atomic_t s_bal_success; /* we found long enough chunks */ 1268 atomic_t s_bal_allocated; /* in blocks */ 1269 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1270 atomic_t s_bal_goals; /* goal hits */ 1271 atomic_t s_bal_breaks; /* too long searches */ 1272 atomic_t s_bal_2orders; /* 2^order hits */ 1273 spinlock_t s_bal_lock; 1274 unsigned long s_mb_buddies_generated; 1275 unsigned long long s_mb_generation_time; 1276 atomic_t s_mb_lost_chunks; 1277 atomic_t s_mb_preallocated; 1278 atomic_t s_mb_discarded; 1279 atomic_t s_lock_busy; 1280 1281 /* locality groups */ 1282 struct ext4_locality_group __percpu *s_locality_groups; 1283 1284 /* for write statistics */ 1285 unsigned long s_sectors_written_start; 1286 u64 s_kbytes_written; 1287 1288 /* the size of zero-out chunk */ 1289 unsigned int s_extent_max_zeroout_kb; 1290 1291 unsigned int s_log_groups_per_flex; 1292 struct flex_groups *s_flex_groups; 1293 ext4_group_t s_flex_groups_allocated; 1294 1295 /* workqueue for dio unwritten */ 1296 struct workqueue_struct *dio_unwritten_wq; 1297 1298 /* timer for periodic error stats printing */ 1299 struct timer_list s_err_report; 1300 1301 /* Lazy inode table initialization info */ 1302 struct ext4_li_request *s_li_request; 1303 /* Wait multiplier for lazy initialization thread */ 1304 unsigned int s_li_wait_mult; 1305 1306 /* Kernel thread for multiple mount protection */ 1307 struct task_struct *s_mmp_tsk; 1308 1309 /* record the last minlen when FITRIM is called. */ 1310 atomic_t s_last_trim_minblks; 1311 1312 /* Reference to checksum algorithm driver via cryptoapi */ 1313 struct crypto_shash *s_chksum_driver; 1314 1315 /* Precomputed FS UUID checksum for seeding other checksums */ 1316 __u32 s_csum_seed; 1317 }; 1318 1319 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1320 { 1321 return sb->s_fs_info; 1322 } 1323 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1324 { 1325 return container_of(inode, struct ext4_inode_info, vfs_inode); 1326 } 1327 1328 static inline struct timespec ext4_current_time(struct inode *inode) 1329 { 1330 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1331 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1332 } 1333 1334 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1335 { 1336 return ino == EXT4_ROOT_INO || 1337 ino == EXT4_USR_QUOTA_INO || 1338 ino == EXT4_GRP_QUOTA_INO || 1339 ino == EXT4_JOURNAL_INO || 1340 ino == EXT4_RESIZE_INO || 1341 (ino >= EXT4_FIRST_INO(sb) && 1342 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1343 } 1344 1345 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 1346 struct ext4_io_end *io_end) 1347 { 1348 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 1349 io_end->flag |= EXT4_IO_END_UNWRITTEN; 1350 atomic_inc(&EXT4_I(inode)->i_unwritten); 1351 } 1352 } 1353 1354 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode) 1355 { 1356 return inode->i_private; 1357 } 1358 1359 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io) 1360 { 1361 inode->i_private = io; 1362 } 1363 1364 /* 1365 * Inode dynamic state flags 1366 */ 1367 enum { 1368 EXT4_STATE_JDATA, /* journaled data exists */ 1369 EXT4_STATE_NEW, /* inode is newly created */ 1370 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1371 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1372 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1373 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1374 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1375 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1376 EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */ 1377 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read 1378 nolocking */ 1379 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1380 }; 1381 1382 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1383 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1384 { \ 1385 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1386 } \ 1387 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1388 { \ 1389 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1390 } \ 1391 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1392 { \ 1393 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1394 } 1395 1396 EXT4_INODE_BIT_FNS(flag, flags, 0) 1397 #if (BITS_PER_LONG < 64) 1398 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1399 1400 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1401 { 1402 (ei)->i_state_flags = 0; 1403 } 1404 #else 1405 EXT4_INODE_BIT_FNS(state, flags, 32) 1406 1407 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1408 { 1409 /* We depend on the fact that callers will set i_flags */ 1410 } 1411 #endif 1412 #else 1413 /* Assume that user mode programs are passing in an ext4fs superblock, not 1414 * a kernel struct super_block. This will allow us to call the feature-test 1415 * macros from user land. */ 1416 #define EXT4_SB(sb) (sb) 1417 #endif 1418 1419 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1420 1421 /* 1422 * Codes for operating systems 1423 */ 1424 #define EXT4_OS_LINUX 0 1425 #define EXT4_OS_HURD 1 1426 #define EXT4_OS_MASIX 2 1427 #define EXT4_OS_FREEBSD 3 1428 #define EXT4_OS_LITES 4 1429 1430 /* 1431 * Revision levels 1432 */ 1433 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1434 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1435 1436 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1437 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1438 1439 #define EXT4_GOOD_OLD_INODE_SIZE 128 1440 1441 /* 1442 * Feature set definitions 1443 */ 1444 1445 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1446 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1447 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1448 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1449 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1450 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1451 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1452 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1453 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1454 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1455 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1456 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1457 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1458 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1459 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1460 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1461 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1462 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1463 1464 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1465 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1466 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1467 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1468 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1469 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1470 1471 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1472 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1473 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1474 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1475 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1476 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1477 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1478 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1479 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1480 /* 1481 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1482 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1483 * all other data structures' checksums. However, the METADATA_CSUM and 1484 * GDT_CSUM bits are mutually exclusive. 1485 */ 1486 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1487 1488 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1489 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1490 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1491 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1492 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1493 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1494 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1495 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1496 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1497 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1498 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1499 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */ 1500 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1501 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1502 1503 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1504 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1505 EXT4_FEATURE_INCOMPAT_META_BG) 1506 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1507 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1508 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1509 1510 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1511 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1512 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1513 EXT4_FEATURE_INCOMPAT_META_BG) 1514 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1515 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1516 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1517 1518 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 1519 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1520 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1521 EXT4_FEATURE_INCOMPAT_META_BG| \ 1522 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1523 EXT4_FEATURE_INCOMPAT_64BIT| \ 1524 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1525 EXT4_FEATURE_INCOMPAT_MMP | \ 1526 EXT4_FEATURE_INCOMPAT_INLINE_DATA) 1527 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1528 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1529 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1530 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1531 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1532 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1533 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1534 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1535 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1536 EXT4_FEATURE_RO_COMPAT_QUOTA) 1537 1538 /* 1539 * Default values for user and/or group using reserved blocks 1540 */ 1541 #define EXT4_DEF_RESUID 0 1542 #define EXT4_DEF_RESGID 0 1543 1544 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1545 1546 /* 1547 * Default mount options 1548 */ 1549 #define EXT4_DEFM_DEBUG 0x0001 1550 #define EXT4_DEFM_BSDGROUPS 0x0002 1551 #define EXT4_DEFM_XATTR_USER 0x0004 1552 #define EXT4_DEFM_ACL 0x0008 1553 #define EXT4_DEFM_UID16 0x0010 1554 #define EXT4_DEFM_JMODE 0x0060 1555 #define EXT4_DEFM_JMODE_DATA 0x0020 1556 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1557 #define EXT4_DEFM_JMODE_WBACK 0x0060 1558 #define EXT4_DEFM_NOBARRIER 0x0100 1559 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1560 #define EXT4_DEFM_DISCARD 0x0400 1561 #define EXT4_DEFM_NODELALLOC 0x0800 1562 1563 /* 1564 * Default journal batch times 1565 */ 1566 #define EXT4_DEF_MIN_BATCH_TIME 0 1567 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1568 1569 /* 1570 * Minimum number of groups in a flexgroup before we separate out 1571 * directories into the first block group of a flexgroup 1572 */ 1573 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1574 1575 /* 1576 * Structure of a directory entry 1577 */ 1578 #define EXT4_NAME_LEN 255 1579 1580 struct ext4_dir_entry { 1581 __le32 inode; /* Inode number */ 1582 __le16 rec_len; /* Directory entry length */ 1583 __le16 name_len; /* Name length */ 1584 char name[EXT4_NAME_LEN]; /* File name */ 1585 }; 1586 1587 /* 1588 * The new version of the directory entry. Since EXT4 structures are 1589 * stored in intel byte order, and the name_len field could never be 1590 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1591 * file_type field. 1592 */ 1593 struct ext4_dir_entry_2 { 1594 __le32 inode; /* Inode number */ 1595 __le16 rec_len; /* Directory entry length */ 1596 __u8 name_len; /* Name length */ 1597 __u8 file_type; 1598 char name[EXT4_NAME_LEN]; /* File name */ 1599 }; 1600 1601 /* 1602 * This is a bogus directory entry at the end of each leaf block that 1603 * records checksums. 1604 */ 1605 struct ext4_dir_entry_tail { 1606 __le32 det_reserved_zero1; /* Pretend to be unused */ 1607 __le16 det_rec_len; /* 12 */ 1608 __u8 det_reserved_zero2; /* Zero name length */ 1609 __u8 det_reserved_ft; /* 0xDE, fake file type */ 1610 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1611 }; 1612 1613 #define EXT4_DIRENT_TAIL(block, blocksize) \ 1614 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 1615 ((blocksize) - \ 1616 sizeof(struct ext4_dir_entry_tail)))) 1617 1618 /* 1619 * Ext4 directory file types. Only the low 3 bits are used. The 1620 * other bits are reserved for now. 1621 */ 1622 #define EXT4_FT_UNKNOWN 0 1623 #define EXT4_FT_REG_FILE 1 1624 #define EXT4_FT_DIR 2 1625 #define EXT4_FT_CHRDEV 3 1626 #define EXT4_FT_BLKDEV 4 1627 #define EXT4_FT_FIFO 5 1628 #define EXT4_FT_SOCK 6 1629 #define EXT4_FT_SYMLINK 7 1630 1631 #define EXT4_FT_MAX 8 1632 1633 #define EXT4_FT_DIR_CSUM 0xDE 1634 1635 /* 1636 * EXT4_DIR_PAD defines the directory entries boundaries 1637 * 1638 * NOTE: It must be a multiple of 4 1639 */ 1640 #define EXT4_DIR_PAD 4 1641 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1642 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1643 ~EXT4_DIR_ROUND) 1644 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1645 1646 /* 1647 * If we ever get support for fs block sizes > page_size, we'll need 1648 * to remove the #if statements in the next two functions... 1649 */ 1650 static inline unsigned int 1651 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1652 { 1653 unsigned len = le16_to_cpu(dlen); 1654 1655 #if (PAGE_CACHE_SIZE >= 65536) 1656 if (len == EXT4_MAX_REC_LEN || len == 0) 1657 return blocksize; 1658 return (len & 65532) | ((len & 3) << 16); 1659 #else 1660 return len; 1661 #endif 1662 } 1663 1664 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1665 { 1666 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1667 BUG(); 1668 #if (PAGE_CACHE_SIZE >= 65536) 1669 if (len < 65536) 1670 return cpu_to_le16(len); 1671 if (len == blocksize) { 1672 if (blocksize == 65536) 1673 return cpu_to_le16(EXT4_MAX_REC_LEN); 1674 else 1675 return cpu_to_le16(0); 1676 } 1677 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 1678 #else 1679 return cpu_to_le16(len); 1680 #endif 1681 } 1682 1683 /* 1684 * Hash Tree Directory indexing 1685 * (c) Daniel Phillips, 2001 1686 */ 1687 1688 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 1689 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 1690 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 1691 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 1692 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 1693 1694 /* Legal values for the dx_root hash_version field: */ 1695 1696 #define DX_HASH_LEGACY 0 1697 #define DX_HASH_HALF_MD4 1 1698 #define DX_HASH_TEA 2 1699 #define DX_HASH_LEGACY_UNSIGNED 3 1700 #define DX_HASH_HALF_MD4_UNSIGNED 4 1701 #define DX_HASH_TEA_UNSIGNED 5 1702 1703 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 1704 const void *address, unsigned int length) 1705 { 1706 struct { 1707 struct shash_desc shash; 1708 char ctx[4]; 1709 } desc; 1710 int err; 1711 1712 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 1713 1714 desc.shash.tfm = sbi->s_chksum_driver; 1715 desc.shash.flags = 0; 1716 *(u32 *)desc.ctx = crc; 1717 1718 err = crypto_shash_update(&desc.shash, address, length); 1719 BUG_ON(err); 1720 1721 return *(u32 *)desc.ctx; 1722 } 1723 1724 #ifdef __KERNEL__ 1725 1726 /* hash info structure used by the directory hash */ 1727 struct dx_hash_info 1728 { 1729 u32 hash; 1730 u32 minor_hash; 1731 int hash_version; 1732 u32 *seed; 1733 }; 1734 1735 1736 /* 32 and 64 bit signed EOF for dx directories */ 1737 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 1738 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 1739 1740 1741 /* 1742 * Control parameters used by ext4_htree_next_block 1743 */ 1744 #define HASH_NB_ALWAYS 1 1745 1746 1747 /* 1748 * Describe an inode's exact location on disk and in memory 1749 */ 1750 struct ext4_iloc 1751 { 1752 struct buffer_head *bh; 1753 unsigned long offset; 1754 ext4_group_t block_group; 1755 }; 1756 1757 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 1758 { 1759 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 1760 } 1761 1762 /* 1763 * This structure is stuffed into the struct file's private_data field 1764 * for directories. It is where we put information so that we can do 1765 * readdir operations in hash tree order. 1766 */ 1767 struct dir_private_info { 1768 struct rb_root root; 1769 struct rb_node *curr_node; 1770 struct fname *extra_fname; 1771 loff_t last_pos; 1772 __u32 curr_hash; 1773 __u32 curr_minor_hash; 1774 __u32 next_hash; 1775 }; 1776 1777 /* calculate the first block number of the group */ 1778 static inline ext4_fsblk_t 1779 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 1780 { 1781 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 1782 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 1783 } 1784 1785 /* 1786 * Special error return code only used by dx_probe() and its callers. 1787 */ 1788 #define ERR_BAD_DX_DIR -75000 1789 1790 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, 1791 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); 1792 1793 /* 1794 * Timeout and state flag for lazy initialization inode thread. 1795 */ 1796 #define EXT4_DEF_LI_WAIT_MULT 10 1797 #define EXT4_DEF_LI_MAX_START_DELAY 5 1798 #define EXT4_LAZYINIT_QUIT 0x0001 1799 #define EXT4_LAZYINIT_RUNNING 0x0002 1800 1801 /* 1802 * Lazy inode table initialization info 1803 */ 1804 struct ext4_lazy_init { 1805 unsigned long li_state; 1806 struct list_head li_request_list; 1807 struct mutex li_list_mtx; 1808 }; 1809 1810 struct ext4_li_request { 1811 struct super_block *lr_super; 1812 struct ext4_sb_info *lr_sbi; 1813 ext4_group_t lr_next_group; 1814 struct list_head lr_request; 1815 unsigned long lr_next_sched; 1816 unsigned long lr_timeout; 1817 }; 1818 1819 struct ext4_features { 1820 struct kobject f_kobj; 1821 struct completion f_kobj_unregister; 1822 }; 1823 1824 /* 1825 * This structure will be used for multiple mount protection. It will be 1826 * written into the block number saved in the s_mmp_block field in the 1827 * superblock. Programs that check MMP should assume that if 1828 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 1829 * to use the filesystem, regardless of how old the timestamp is. 1830 */ 1831 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 1832 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 1833 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 1834 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 1835 1836 struct mmp_struct { 1837 __le32 mmp_magic; /* Magic number for MMP */ 1838 __le32 mmp_seq; /* Sequence no. updated periodically */ 1839 1840 /* 1841 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 1842 * purposes and do not affect the correctness of the algorithm 1843 */ 1844 __le64 mmp_time; /* Time last updated */ 1845 char mmp_nodename[64]; /* Node which last updated MMP block */ 1846 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 1847 1848 /* 1849 * mmp_check_interval is used to verify if the MMP block has been 1850 * updated on the block device. The value is updated based on the 1851 * maximum time to write the MMP block during an update cycle. 1852 */ 1853 __le16 mmp_check_interval; 1854 1855 __le16 mmp_pad1; 1856 __le32 mmp_pad2[226]; 1857 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 1858 }; 1859 1860 /* arguments passed to the mmp thread */ 1861 struct mmpd_data { 1862 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 1863 struct super_block *sb; /* super block of the fs */ 1864 }; 1865 1866 /* 1867 * Check interval multiplier 1868 * The MMP block is written every update interval and initially checked every 1869 * update interval x the multiplier (the value is then adapted based on the 1870 * write latency). The reason is that writes can be delayed under load and we 1871 * don't want readers to incorrectly assume that the filesystem is no longer 1872 * in use. 1873 */ 1874 #define EXT4_MMP_CHECK_MULT 2UL 1875 1876 /* 1877 * Minimum interval for MMP checking in seconds. 1878 */ 1879 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 1880 1881 /* 1882 * Maximum interval for MMP checking in seconds. 1883 */ 1884 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 1885 1886 /* 1887 * Function prototypes 1888 */ 1889 1890 /* 1891 * Ok, these declarations are also in <linux/kernel.h> but none of the 1892 * ext4 source programs needs to include it so they are duplicated here. 1893 */ 1894 # define NORET_TYPE /**/ 1895 # define ATTRIB_NORET __attribute__((noreturn)) 1896 # define NORET_AND noreturn, 1897 1898 /* bitmap.c */ 1899 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 1900 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 1901 struct ext4_group_desc *gdp, 1902 struct buffer_head *bh, int sz); 1903 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 1904 struct ext4_group_desc *gdp, 1905 struct buffer_head *bh, int sz); 1906 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 1907 struct ext4_group_desc *gdp, 1908 struct buffer_head *bh); 1909 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 1910 struct ext4_group_desc *gdp, 1911 struct buffer_head *bh); 1912 1913 /* balloc.c */ 1914 extern void ext4_validate_block_bitmap(struct super_block *sb, 1915 struct ext4_group_desc *desc, 1916 unsigned int block_group, 1917 struct buffer_head *bh); 1918 extern unsigned int ext4_block_group(struct super_block *sb, 1919 ext4_fsblk_t blocknr); 1920 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 1921 ext4_fsblk_t blocknr); 1922 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 1923 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 1924 ext4_group_t group); 1925 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 1926 ext4_fsblk_t goal, 1927 unsigned int flags, 1928 unsigned long *count, 1929 int *errp); 1930 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 1931 s64 nclusters, unsigned int flags); 1932 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 1933 extern void ext4_check_blocks_bitmap(struct super_block *); 1934 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 1935 ext4_group_t block_group, 1936 struct buffer_head ** bh); 1937 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1938 1939 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 1940 ext4_group_t block_group); 1941 extern int ext4_wait_block_bitmap(struct super_block *sb, 1942 ext4_group_t block_group, 1943 struct buffer_head *bh); 1944 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 1945 ext4_group_t block_group); 1946 extern void ext4_init_block_bitmap(struct super_block *sb, 1947 struct buffer_head *bh, 1948 ext4_group_t group, 1949 struct ext4_group_desc *desc); 1950 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 1951 ext4_group_t block_group, 1952 struct ext4_group_desc *gdp); 1953 extern unsigned ext4_num_overhead_clusters(struct super_block *sb, 1954 ext4_group_t block_group, 1955 struct ext4_group_desc *gdp); 1956 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 1957 1958 /* dir.c */ 1959 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 1960 struct file *, 1961 struct ext4_dir_entry_2 *, 1962 struct buffer_head *, char *, int, 1963 unsigned int); 1964 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 1965 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 1966 (de), (bh), (buf), (size), (offset))) 1967 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 1968 __u32 minor_hash, 1969 struct ext4_dir_entry_2 *dirent); 1970 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 1971 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 1972 struct buffer_head *bh, 1973 void *buf, int buf_size, 1974 const char *name, int namelen, 1975 struct ext4_dir_entry_2 **dest_de); 1976 void ext4_insert_dentry(struct inode *inode, 1977 struct ext4_dir_entry_2 *de, 1978 int buf_size, 1979 const char *name, int namelen); 1980 static inline void ext4_update_dx_flag(struct inode *inode) 1981 { 1982 if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb, 1983 EXT4_FEATURE_COMPAT_DIR_INDEX)) 1984 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 1985 } 1986 static unsigned char ext4_filetype_table[] = { 1987 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 1988 }; 1989 1990 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 1991 { 1992 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE) || 1993 (filetype >= EXT4_FT_MAX)) 1994 return DT_UNKNOWN; 1995 1996 return ext4_filetype_table[filetype]; 1997 } 1998 1999 /* fsync.c */ 2000 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2001 extern int ext4_flush_unwritten_io(struct inode *); 2002 2003 /* hash.c */ 2004 extern int ext4fs_dirhash(const char *name, int len, struct 2005 dx_hash_info *hinfo); 2006 2007 /* ialloc.c */ 2008 extern struct inode *ext4_new_inode(handle_t *, struct inode *, umode_t, 2009 const struct qstr *qstr, __u32 goal, 2010 uid_t *owner); 2011 extern void ext4_free_inode(handle_t *, struct inode *); 2012 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2013 extern unsigned long ext4_count_free_inodes(struct super_block *); 2014 extern unsigned long ext4_count_dirs(struct super_block *); 2015 extern void ext4_check_inodes_bitmap(struct super_block *); 2016 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2017 extern int ext4_init_inode_table(struct super_block *sb, 2018 ext4_group_t group, int barrier); 2019 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2020 2021 /* mballoc.c */ 2022 extern long ext4_mb_stats; 2023 extern long ext4_mb_max_to_scan; 2024 extern int ext4_mb_init(struct super_block *); 2025 extern int ext4_mb_release(struct super_block *); 2026 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2027 struct ext4_allocation_request *, int *); 2028 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2029 extern void ext4_discard_preallocations(struct inode *); 2030 extern int __init ext4_init_mballoc(void); 2031 extern void ext4_exit_mballoc(void); 2032 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2033 struct buffer_head *bh, ext4_fsblk_t block, 2034 unsigned long count, int flags); 2035 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2036 ext4_group_t ngroups); 2037 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2038 ext4_group_t i, struct ext4_group_desc *desc); 2039 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2040 ext4_fsblk_t block, unsigned long count); 2041 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2042 2043 /* inode.c */ 2044 struct buffer_head *ext4_getblk(handle_t *, struct inode *, 2045 ext4_lblk_t, int, int *); 2046 struct buffer_head *ext4_bread(handle_t *, struct inode *, 2047 ext4_lblk_t, int, int *); 2048 int ext4_get_block_write(struct inode *inode, sector_t iblock, 2049 struct buffer_head *bh_result, int create); 2050 int ext4_get_block(struct inode *inode, sector_t iblock, 2051 struct buffer_head *bh_result, int create); 2052 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2053 struct buffer_head *bh, int create); 2054 int ext4_walk_page_buffers(handle_t *handle, 2055 struct buffer_head *head, 2056 unsigned from, 2057 unsigned to, 2058 int *partial, 2059 int (*fn)(handle_t *handle, 2060 struct buffer_head *bh)); 2061 int do_journal_get_write_access(handle_t *handle, 2062 struct buffer_head *bh); 2063 #define FALL_BACK_TO_NONDELALLOC 1 2064 #define CONVERT_INLINE_DATA 2 2065 2066 extern struct inode *ext4_iget(struct super_block *, unsigned long); 2067 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2068 extern int ext4_setattr(struct dentry *, struct iattr *); 2069 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 2070 struct kstat *stat); 2071 extern void ext4_evict_inode(struct inode *); 2072 extern void ext4_clear_inode(struct inode *); 2073 extern int ext4_sync_inode(handle_t *, struct inode *); 2074 extern void ext4_dirty_inode(struct inode *, int); 2075 extern int ext4_change_inode_journal_flag(struct inode *, int); 2076 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2077 extern int ext4_can_truncate(struct inode *inode); 2078 extern void ext4_truncate(struct inode *); 2079 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length); 2080 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 2081 extern void ext4_set_inode_flags(struct inode *); 2082 extern void ext4_get_inode_flags(struct ext4_inode_info *); 2083 extern int ext4_alloc_da_blocks(struct inode *inode); 2084 extern void ext4_set_aops(struct inode *inode); 2085 extern int ext4_writepage_trans_blocks(struct inode *); 2086 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2087 extern int ext4_discard_partial_page_buffers(handle_t *handle, 2088 struct address_space *mapping, loff_t from, 2089 loff_t length, int flags); 2090 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 2091 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2092 extern void ext4_da_update_reserve_space(struct inode *inode, 2093 int used, int quota_claim); 2094 2095 /* indirect.c */ 2096 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2097 struct ext4_map_blocks *map, int flags); 2098 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb, 2099 const struct iovec *iov, loff_t offset, 2100 unsigned long nr_segs); 2101 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2102 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk); 2103 extern void ext4_ind_truncate(struct inode *inode); 2104 extern int ext4_ind_punch_hole(struct file *file, loff_t offset, loff_t length); 2105 2106 /* ioctl.c */ 2107 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2108 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2109 2110 /* migrate.c */ 2111 extern int ext4_ext_migrate(struct inode *); 2112 2113 /* namei.c */ 2114 extern int ext4_dirent_csum_verify(struct inode *inode, 2115 struct ext4_dir_entry *dirent); 2116 extern int ext4_orphan_add(handle_t *, struct inode *); 2117 extern int ext4_orphan_del(handle_t *, struct inode *); 2118 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2119 __u32 start_minor_hash, __u32 *next_hash); 2120 extern int search_dir(struct buffer_head *bh, 2121 char *search_buf, 2122 int buf_size, 2123 struct inode *dir, 2124 const struct qstr *d_name, 2125 unsigned int offset, 2126 struct ext4_dir_entry_2 **res_dir); 2127 extern int ext4_generic_delete_entry(handle_t *handle, 2128 struct inode *dir, 2129 struct ext4_dir_entry_2 *de_del, 2130 struct buffer_head *bh, 2131 void *entry_buf, 2132 int buf_size, 2133 int csum_size); 2134 2135 /* resize.c */ 2136 extern int ext4_group_add(struct super_block *sb, 2137 struct ext4_new_group_data *input); 2138 extern int ext4_group_extend(struct super_block *sb, 2139 struct ext4_super_block *es, 2140 ext4_fsblk_t n_blocks_count); 2141 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2142 2143 /* super.c */ 2144 extern int ext4_calculate_overhead(struct super_block *sb); 2145 extern int ext4_superblock_csum_verify(struct super_block *sb, 2146 struct ext4_super_block *es); 2147 extern void ext4_superblock_csum_set(struct super_block *sb); 2148 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 2149 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 2150 extern void ext4_kvfree(void *ptr); 2151 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2152 ext4_group_t ngroup); 2153 extern __printf(4, 5) 2154 void __ext4_error(struct super_block *, const char *, unsigned int, 2155 const char *, ...); 2156 #define ext4_error(sb, message...) __ext4_error(sb, __func__, \ 2157 __LINE__, ## message) 2158 extern __printf(5, 6) 2159 void ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2160 const char *, ...); 2161 extern __printf(5, 6) 2162 void ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2163 const char *, ...); 2164 extern void __ext4_std_error(struct super_block *, const char *, 2165 unsigned int, int); 2166 extern __printf(4, 5) 2167 void __ext4_abort(struct super_block *, const char *, unsigned int, 2168 const char *, ...); 2169 #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \ 2170 __LINE__, ## message) 2171 extern __printf(4, 5) 2172 void __ext4_warning(struct super_block *, const char *, unsigned int, 2173 const char *, ...); 2174 #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \ 2175 __LINE__, ## message) 2176 extern __printf(3, 4) 2177 void ext4_msg(struct super_block *, const char *, const char *, ...); 2178 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2179 const char *, unsigned int, const char *); 2180 #define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \ 2181 __LINE__, msg) 2182 extern __printf(7, 8) 2183 void __ext4_grp_locked_error(const char *, unsigned int, 2184 struct super_block *, ext4_group_t, 2185 unsigned long, ext4_fsblk_t, 2186 const char *, ...); 2187 #define ext4_grp_locked_error(sb, grp, message...) \ 2188 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message) 2189 extern void ext4_update_dynamic_rev(struct super_block *sb); 2190 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2191 __u32 compat); 2192 extern int ext4_update_rocompat_feature(handle_t *handle, 2193 struct super_block *sb, __u32 rocompat); 2194 extern int ext4_update_incompat_feature(handle_t *handle, 2195 struct super_block *sb, __u32 incompat); 2196 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2197 struct ext4_group_desc *bg); 2198 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2199 struct ext4_group_desc *bg); 2200 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2201 struct ext4_group_desc *bg); 2202 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2203 struct ext4_group_desc *bg); 2204 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2205 struct ext4_group_desc *bg); 2206 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2207 struct ext4_group_desc *bg); 2208 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2209 struct ext4_group_desc *bg); 2210 extern void ext4_block_bitmap_set(struct super_block *sb, 2211 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2212 extern void ext4_inode_bitmap_set(struct super_block *sb, 2213 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2214 extern void ext4_inode_table_set(struct super_block *sb, 2215 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2216 extern void ext4_free_group_clusters_set(struct super_block *sb, 2217 struct ext4_group_desc *bg, 2218 __u32 count); 2219 extern void ext4_free_inodes_set(struct super_block *sb, 2220 struct ext4_group_desc *bg, __u32 count); 2221 extern void ext4_used_dirs_set(struct super_block *sb, 2222 struct ext4_group_desc *bg, __u32 count); 2223 extern void ext4_itable_unused_set(struct super_block *sb, 2224 struct ext4_group_desc *bg, __u32 count); 2225 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2226 struct ext4_group_desc *gdp); 2227 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2228 struct ext4_group_desc *gdp); 2229 extern int ext4_register_li_request(struct super_block *sb, 2230 ext4_group_t first_not_zeroed); 2231 2232 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2233 { 2234 return EXT4_HAS_RO_COMPAT_FEATURE(sb, 2235 EXT4_FEATURE_RO_COMPAT_GDT_CSUM | 2236 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM); 2237 } 2238 2239 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2240 { 2241 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2242 le32_to_cpu(es->s_blocks_count_lo); 2243 } 2244 2245 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2246 { 2247 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2248 le32_to_cpu(es->s_r_blocks_count_lo); 2249 } 2250 2251 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2252 { 2253 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2254 le32_to_cpu(es->s_free_blocks_count_lo); 2255 } 2256 2257 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2258 ext4_fsblk_t blk) 2259 { 2260 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2261 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2262 } 2263 2264 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2265 ext4_fsblk_t blk) 2266 { 2267 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2268 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2269 } 2270 2271 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2272 ext4_fsblk_t blk) 2273 { 2274 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2275 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2276 } 2277 2278 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 2279 { 2280 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2281 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2282 le32_to_cpu(raw_inode->i_size_lo); 2283 else 2284 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2285 } 2286 2287 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2288 { 2289 raw_inode->i_size_lo = cpu_to_le32(i_size); 2290 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2291 } 2292 2293 static inline 2294 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2295 ext4_group_t group) 2296 { 2297 struct ext4_group_info ***grp_info; 2298 long indexv, indexh; 2299 grp_info = EXT4_SB(sb)->s_group_info; 2300 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2301 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2302 return grp_info[indexv][indexh]; 2303 } 2304 2305 /* 2306 * Reading s_groups_count requires using smp_rmb() afterwards. See 2307 * the locking protocol documented in the comments of ext4_group_add() 2308 * in resize.c 2309 */ 2310 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2311 { 2312 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2313 2314 smp_rmb(); 2315 return ngroups; 2316 } 2317 2318 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2319 ext4_group_t block_group) 2320 { 2321 return block_group >> sbi->s_log_groups_per_flex; 2322 } 2323 2324 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2325 { 2326 return 1 << sbi->s_log_groups_per_flex; 2327 } 2328 2329 #define ext4_std_error(sb, errno) \ 2330 do { \ 2331 if ((errno)) \ 2332 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2333 } while (0) 2334 2335 #ifdef CONFIG_SMP 2336 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2337 * counters. So we need to make sure we have free clusters more 2338 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2339 */ 2340 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2341 #else 2342 #define EXT4_FREECLUSTERS_WATERMARK 0 2343 #endif 2344 2345 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2346 { 2347 /* 2348 * XXX: replace with spinlock if seen contended -bzzz 2349 */ 2350 down_write(&EXT4_I(inode)->i_data_sem); 2351 if (newsize > EXT4_I(inode)->i_disksize) 2352 EXT4_I(inode)->i_disksize = newsize; 2353 up_write(&EXT4_I(inode)->i_data_sem); 2354 return ; 2355 } 2356 2357 struct ext4_group_info { 2358 unsigned long bb_state; 2359 struct rb_root bb_free_root; 2360 ext4_grpblk_t bb_first_free; /* first free block */ 2361 ext4_grpblk_t bb_free; /* total free blocks */ 2362 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 2363 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 2364 struct list_head bb_prealloc_list; 2365 #ifdef DOUBLE_CHECK 2366 void *bb_bitmap; 2367 #endif 2368 struct rw_semaphore alloc_sem; 2369 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2370 * regions, index is order. 2371 * bb_counters[3] = 5 means 2372 * 5 free 8-block regions. */ 2373 }; 2374 2375 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 2376 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 2377 2378 #define EXT4_MB_GRP_NEED_INIT(grp) \ 2379 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 2380 2381 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 2382 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2383 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 2384 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2385 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 2386 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2387 2388 #define EXT4_MAX_CONTENTION 8 2389 #define EXT4_CONTENTION_THRESHOLD 2 2390 2391 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2392 ext4_group_t group) 2393 { 2394 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2395 } 2396 2397 /* 2398 * Returns true if the filesystem is busy enough that attempts to 2399 * access the block group locks has run into contention. 2400 */ 2401 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 2402 { 2403 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 2404 } 2405 2406 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 2407 { 2408 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 2409 if (spin_trylock(lock)) 2410 /* 2411 * We're able to grab the lock right away, so drop the 2412 * lock contention counter. 2413 */ 2414 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 2415 else { 2416 /* 2417 * The lock is busy, so bump the contention counter, 2418 * and then wait on the spin lock. 2419 */ 2420 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 2421 EXT4_MAX_CONTENTION); 2422 spin_lock(lock); 2423 } 2424 } 2425 2426 static inline void ext4_unlock_group(struct super_block *sb, 2427 ext4_group_t group) 2428 { 2429 spin_unlock(ext4_group_lock_ptr(sb, group)); 2430 } 2431 2432 /* 2433 * Block validity checking 2434 */ 2435 #define ext4_check_indirect_blockref(inode, bh) \ 2436 ext4_check_blockref(__func__, __LINE__, inode, \ 2437 (__le32 *)(bh)->b_data, \ 2438 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 2439 2440 #define ext4_ind_check_inode(inode) \ 2441 ext4_check_blockref(__func__, __LINE__, inode, \ 2442 EXT4_I(inode)->i_data, \ 2443 EXT4_NDIR_BLOCKS) 2444 2445 /* 2446 * Inodes and files operations 2447 */ 2448 2449 /* dir.c */ 2450 extern const struct file_operations ext4_dir_operations; 2451 2452 /* file.c */ 2453 extern const struct inode_operations ext4_file_inode_operations; 2454 extern const struct file_operations ext4_file_operations; 2455 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 2456 extern void ext4_unwritten_wait(struct inode *inode); 2457 2458 /* namei.c */ 2459 extern const struct inode_operations ext4_dir_inode_operations; 2460 extern const struct inode_operations ext4_special_inode_operations; 2461 extern struct dentry *ext4_get_parent(struct dentry *child); 2462 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 2463 struct ext4_dir_entry_2 *de, 2464 int blocksize, int csum_size, 2465 unsigned int parent_ino, int dotdot_real_len); 2466 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t, 2467 unsigned int blocksize); 2468 extern int ext4_handle_dirty_dirent_node(handle_t *handle, 2469 struct inode *inode, 2470 struct buffer_head *bh); 2471 2472 /* symlink.c */ 2473 extern const struct inode_operations ext4_symlink_inode_operations; 2474 extern const struct inode_operations ext4_fast_symlink_inode_operations; 2475 2476 /* block_validity */ 2477 extern void ext4_release_system_zone(struct super_block *sb); 2478 extern int ext4_setup_system_zone(struct super_block *sb); 2479 extern int __init ext4_init_system_zone(void); 2480 extern void ext4_exit_system_zone(void); 2481 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 2482 ext4_fsblk_t start_blk, 2483 unsigned int count); 2484 extern int ext4_check_blockref(const char *, unsigned int, 2485 struct inode *, __le32 *, unsigned int); 2486 2487 /* extents.c */ 2488 struct ext4_ext_path; 2489 struct ext4_extent; 2490 2491 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 2492 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 2493 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, 2494 int chunk); 2495 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 2496 struct ext4_map_blocks *map, int flags); 2497 extern void ext4_ext_truncate(struct inode *); 2498 extern int ext4_ext_punch_hole(struct file *file, loff_t offset, 2499 loff_t length); 2500 extern void ext4_ext_init(struct super_block *); 2501 extern void ext4_ext_release(struct super_block *); 2502 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 2503 loff_t len); 2504 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset, 2505 ssize_t len); 2506 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 2507 struct ext4_map_blocks *map, int flags); 2508 extern int ext4_ext_calc_metadata_amount(struct inode *inode, 2509 ext4_lblk_t lblocks); 2510 extern int ext4_extent_tree_init(handle_t *, struct inode *); 2511 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 2512 int num, 2513 struct ext4_ext_path *path); 2514 extern int ext4_can_extents_be_merged(struct inode *inode, 2515 struct ext4_extent *ex1, 2516 struct ext4_extent *ex2); 2517 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 2518 struct ext4_ext_path *, 2519 struct ext4_extent *, int); 2520 extern struct ext4_ext_path *ext4_ext_find_extent(struct inode *, ext4_lblk_t, 2521 struct ext4_ext_path *); 2522 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 2523 extern int ext4_ext_check_inode(struct inode *inode); 2524 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk); 2525 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2526 __u64 start, __u64 len); 2527 2528 2529 /* move_extent.c */ 2530 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 2531 __u64 start_orig, __u64 start_donor, 2532 __u64 len, __u64 *moved_len); 2533 2534 /* page-io.c */ 2535 extern int __init ext4_init_pageio(void); 2536 extern void ext4_add_complete_io(ext4_io_end_t *io_end); 2537 extern void ext4_exit_pageio(void); 2538 extern void ext4_ioend_wait(struct inode *); 2539 extern void ext4_free_io_end(ext4_io_end_t *io); 2540 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 2541 extern void ext4_io_submit(struct ext4_io_submit *io); 2542 extern int ext4_bio_write_page(struct ext4_io_submit *io, 2543 struct page *page, 2544 int len, 2545 struct writeback_control *wbc); 2546 2547 /* mmp.c */ 2548 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 2549 extern void ext4_mmp_csum_set(struct super_block *sb, struct mmp_struct *mmp); 2550 extern int ext4_mmp_csum_verify(struct super_block *sb, 2551 struct mmp_struct *mmp); 2552 2553 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */ 2554 enum ext4_state_bits { 2555 BH_Uninit /* blocks are allocated but uninitialized on disk */ 2556 = BH_JBDPrivateStart, 2557 BH_AllocFromCluster, /* allocated blocks were part of already 2558 * allocated cluster. Note that this flag will 2559 * never, ever appear in a buffer_head's state 2560 * flag. See EXT4_MAP_FROM_CLUSTER to see where 2561 * this is used. */ 2562 }; 2563 2564 BUFFER_FNS(Uninit, uninit) 2565 TAS_BUFFER_FNS(Uninit, uninit) 2566 2567 /* 2568 * Add new method to test whether block and inode bitmaps are properly 2569 * initialized. With uninit_bg reading the block from disk is not enough 2570 * to mark the bitmap uptodate. We need to also zero-out the bitmap 2571 */ 2572 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 2573 2574 static inline int bitmap_uptodate(struct buffer_head *bh) 2575 { 2576 return (buffer_uptodate(bh) && 2577 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 2578 } 2579 static inline void set_bitmap_uptodate(struct buffer_head *bh) 2580 { 2581 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 2582 } 2583 2584 /* 2585 * Disable DIO read nolock optimization, so new dioreaders will be forced 2586 * to grab i_mutex 2587 */ 2588 static inline void ext4_inode_block_unlocked_dio(struct inode *inode) 2589 { 2590 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 2591 smp_mb(); 2592 } 2593 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode) 2594 { 2595 smp_mb(); 2596 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 2597 } 2598 2599 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 2600 2601 /* For ioend & aio unwritten conversion wait queues */ 2602 #define EXT4_WQ_HASH_SZ 37 2603 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 2604 EXT4_WQ_HASH_SZ]) 2605 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\ 2606 EXT4_WQ_HASH_SZ]) 2607 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 2608 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; 2609 2610 #define EXT4_RESIZING 0 2611 extern int ext4_resize_begin(struct super_block *sb); 2612 extern void ext4_resize_end(struct super_block *sb); 2613 2614 #endif /* __KERNEL__ */ 2615 2616 #endif /* _EXT4_H */ 2617