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 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 61 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 62 63 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 64 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 65 66 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 67 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 68 69 /* data type for block offset of block group */ 70 typedef int ext4_grpblk_t; 71 72 /* data type for filesystem-wide blocks number */ 73 typedef unsigned long long ext4_fsblk_t; 74 75 /* data type for file logical block number */ 76 typedef __u32 ext4_lblk_t; 77 78 /* data type for block group number */ 79 typedef unsigned int ext4_group_t; 80 81 /* 82 * Flags used in mballoc's allocation_context flags field. 83 * 84 * Also used to show what's going on for debugging purposes when the 85 * flag field is exported via the traceport interface 86 */ 87 88 /* prefer goal again. length */ 89 #define EXT4_MB_HINT_MERGE 0x0001 90 /* blocks already reserved */ 91 #define EXT4_MB_HINT_RESERVED 0x0002 92 /* metadata is being allocated */ 93 #define EXT4_MB_HINT_METADATA 0x0004 94 /* first blocks in the file */ 95 #define EXT4_MB_HINT_FIRST 0x0008 96 /* search for the best chunk */ 97 #define EXT4_MB_HINT_BEST 0x0010 98 /* data is being allocated */ 99 #define EXT4_MB_HINT_DATA 0x0020 100 /* don't preallocate (for tails) */ 101 #define EXT4_MB_HINT_NOPREALLOC 0x0040 102 /* allocate for locality group */ 103 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 104 /* allocate goal blocks or none */ 105 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 106 /* goal is meaningful */ 107 #define EXT4_MB_HINT_TRY_GOAL 0x0200 108 /* blocks already pre-reserved by delayed allocation */ 109 #define EXT4_MB_DELALLOC_RESERVED 0x0400 110 /* We are doing stream allocation */ 111 #define EXT4_MB_STREAM_ALLOC 0x0800 112 /* Use reserved root blocks if needed */ 113 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 114 115 struct ext4_allocation_request { 116 /* target inode for block we're allocating */ 117 struct inode *inode; 118 /* how many blocks we want to allocate */ 119 unsigned int len; 120 /* logical block in target inode */ 121 ext4_lblk_t logical; 122 /* the closest logical allocated block to the left */ 123 ext4_lblk_t lleft; 124 /* the closest logical allocated block to the right */ 125 ext4_lblk_t lright; 126 /* phys. target (a hint) */ 127 ext4_fsblk_t goal; 128 /* phys. block for the closest logical allocated block to the left */ 129 ext4_fsblk_t pleft; 130 /* phys. block for the closest logical allocated block to the right */ 131 ext4_fsblk_t pright; 132 /* flags. see above EXT4_MB_HINT_* */ 133 unsigned int flags; 134 }; 135 136 /* 137 * Logical to physical block mapping, used by ext4_map_blocks() 138 * 139 * This structure is used to pass requests into ext4_map_blocks() as 140 * well as to store the information returned by ext4_map_blocks(). It 141 * takes less room on the stack than a struct buffer_head. 142 */ 143 #define EXT4_MAP_NEW (1 << BH_New) 144 #define EXT4_MAP_MAPPED (1 << BH_Mapped) 145 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 146 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 147 #define EXT4_MAP_UNINIT (1 << BH_Uninit) 148 /* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of 149 * ext4_map_blocks wants to know whether or not the underlying cluster has 150 * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that 151 * the requested mapping was from previously mapped (or delayed allocated) 152 * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster 153 * should never appear on buffer_head's state flags. 154 */ 155 #define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster) 156 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 157 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\ 158 EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER) 159 160 struct ext4_map_blocks { 161 ext4_fsblk_t m_pblk; 162 ext4_lblk_t m_lblk; 163 unsigned int m_len; 164 unsigned int m_flags; 165 }; 166 167 /* 168 * For delayed allocation tracking 169 */ 170 struct mpage_da_data { 171 struct inode *inode; 172 sector_t b_blocknr; /* start block number of extent */ 173 size_t b_size; /* size of extent */ 174 unsigned long b_state; /* state of the extent */ 175 unsigned long first_page, next_page; /* extent of pages */ 176 struct writeback_control *wbc; 177 int io_done; 178 int pages_written; 179 int retval; 180 }; 181 182 /* 183 * Flags for ext4_io_end->flags 184 */ 185 #define EXT4_IO_END_UNWRITTEN 0x0001 186 #define EXT4_IO_END_ERROR 0x0002 187 #define EXT4_IO_END_QUEUED 0x0004 188 #define EXT4_IO_END_DIRECT 0x0008 189 190 struct ext4_io_page { 191 struct page *p_page; 192 atomic_t p_count; 193 }; 194 195 #define MAX_IO_PAGES 128 196 197 /* 198 * For converting uninitialized extents on a work queue. 199 * 200 * 'page' is only used from the writepage() path; 'pages' is only used for 201 * buffered writes; they are used to keep page references until conversion 202 * takes place. For AIO/DIO, neither field is filled in. 203 */ 204 typedef struct ext4_io_end { 205 struct list_head list; /* per-file finished IO list */ 206 struct inode *inode; /* file being written to */ 207 unsigned int flag; /* unwritten or not */ 208 struct page *page; /* for writepage() path */ 209 loff_t offset; /* offset in the file */ 210 ssize_t size; /* size of the extent */ 211 struct work_struct work; /* data work queue */ 212 struct kiocb *iocb; /* iocb struct for AIO */ 213 int result; /* error value for AIO */ 214 int num_io_pages; /* for writepages() */ 215 struct ext4_io_page *pages[MAX_IO_PAGES]; /* for writepages() */ 216 } ext4_io_end_t; 217 218 struct ext4_io_submit { 219 int io_op; 220 struct bio *io_bio; 221 ext4_io_end_t *io_end; 222 struct ext4_io_page *io_page; 223 sector_t io_next_block; 224 }; 225 226 /* 227 * Special inodes numbers 228 */ 229 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 230 #define EXT4_ROOT_INO 2 /* Root inode */ 231 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 232 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 233 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 234 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 235 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 236 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 237 238 /* First non-reserved inode for old ext4 filesystems */ 239 #define EXT4_GOOD_OLD_FIRST_INO 11 240 241 /* 242 * Maximal count of links to a file 243 */ 244 #define EXT4_LINK_MAX 65000 245 246 /* 247 * Macro-instructions used to manage several block sizes 248 */ 249 #define EXT4_MIN_BLOCK_SIZE 1024 250 #define EXT4_MAX_BLOCK_SIZE 65536 251 #define EXT4_MIN_BLOCK_LOG_SIZE 10 252 #define EXT4_MAX_BLOCK_LOG_SIZE 16 253 #ifdef __KERNEL__ 254 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 255 #else 256 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 257 #endif 258 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 259 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 260 EXT4_SB(s)->s_cluster_bits) 261 #ifdef __KERNEL__ 262 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 263 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 264 #else 265 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 266 #endif 267 #ifdef __KERNEL__ 268 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 269 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 270 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 271 #else 272 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 273 EXT4_GOOD_OLD_INODE_SIZE : \ 274 (s)->s_inode_size) 275 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 276 EXT4_GOOD_OLD_FIRST_INO : \ 277 (s)->s_first_ino) 278 #endif 279 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 280 281 /* Translate a block number to a cluster number */ 282 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 283 /* Translate a cluster number to a block number */ 284 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 285 /* Translate # of blks to # of clusters */ 286 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 287 (sbi)->s_cluster_bits) 288 289 /* 290 * Structure of a blocks group descriptor 291 */ 292 struct ext4_group_desc 293 { 294 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 295 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 296 __le32 bg_inode_table_lo; /* Inodes table block */ 297 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 298 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 299 __le16 bg_used_dirs_count_lo; /* Directories count */ 300 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 301 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 302 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 303 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 304 __le16 bg_itable_unused_lo; /* Unused inodes count */ 305 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 306 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 307 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 308 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 309 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 310 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 311 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 312 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 313 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 314 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 315 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 316 __u32 bg_reserved; 317 }; 318 319 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 320 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 321 sizeof(__le16)) 322 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 323 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 324 sizeof(__le16)) 325 326 /* 327 * Structure of a flex block group info 328 */ 329 330 struct flex_groups { 331 atomic_t free_inodes; 332 atomic_t free_clusters; 333 atomic_t used_dirs; 334 }; 335 336 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 337 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 338 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 339 340 /* 341 * Macro-instructions used to manage group descriptors 342 */ 343 #define EXT4_MIN_DESC_SIZE 32 344 #define EXT4_MIN_DESC_SIZE_64BIT 64 345 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 346 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 347 #ifdef __KERNEL__ 348 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 349 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 350 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 351 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 352 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 353 #else 354 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 355 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 356 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 357 #endif 358 359 /* 360 * Constants relative to the data blocks 361 */ 362 #define EXT4_NDIR_BLOCKS 12 363 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 364 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 365 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 366 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 367 368 /* 369 * Inode flags 370 */ 371 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 372 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 373 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 374 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 375 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 376 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 377 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 378 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 379 /* Reserved for compression usage... */ 380 #define EXT4_DIRTY_FL 0x00000100 381 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 382 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 383 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 384 /* End compression flags --- maybe not all used */ 385 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 386 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 387 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 388 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 389 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 390 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 391 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 392 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 393 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 394 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 395 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 396 397 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 398 #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ 399 400 /* Flags that should be inherited by new inodes from their parent. */ 401 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 402 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 403 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 404 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 405 406 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 407 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 408 409 /* Flags that are appropriate for non-directories/regular files. */ 410 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 411 412 /* Mask out flags that are inappropriate for the given type of inode. */ 413 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 414 { 415 if (S_ISDIR(mode)) 416 return flags; 417 else if (S_ISREG(mode)) 418 return flags & EXT4_REG_FLMASK; 419 else 420 return flags & EXT4_OTHER_FLMASK; 421 } 422 423 /* 424 * Inode flags used for atomic set/get 425 */ 426 enum { 427 EXT4_INODE_SECRM = 0, /* Secure deletion */ 428 EXT4_INODE_UNRM = 1, /* Undelete */ 429 EXT4_INODE_COMPR = 2, /* Compress file */ 430 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 431 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 432 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 433 EXT4_INODE_NODUMP = 6, /* do not dump file */ 434 EXT4_INODE_NOATIME = 7, /* do not update atime */ 435 /* Reserved for compression usage... */ 436 EXT4_INODE_DIRTY = 8, 437 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 438 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 439 EXT4_INODE_ECOMPR = 11, /* Compression error */ 440 /* End compression flags --- maybe not all used */ 441 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 442 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 443 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 444 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 445 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 446 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 447 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 448 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 449 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 450 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 451 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 452 }; 453 454 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 455 #define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \ 456 printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \ 457 EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); } 458 459 /* 460 * Since it's pretty easy to mix up bit numbers and hex values, and we 461 * can't do a compile-time test for ENUM values, we use a run-time 462 * test to make sure that EXT4_XXX_FL is consistent with respect to 463 * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop 464 * out so it won't cost any extra space in the compiled kernel image. 465 * But it's important that these values are the same, since we are 466 * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL 467 * must be consistent with the values of FS_XXX_FL defined in 468 * include/linux/fs.h and the on-disk values found in ext2, ext3, and 469 * ext4 filesystems, and of course the values defined in e2fsprogs. 470 * 471 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 472 */ 473 static inline void ext4_check_flag_values(void) 474 { 475 CHECK_FLAG_VALUE(SECRM); 476 CHECK_FLAG_VALUE(UNRM); 477 CHECK_FLAG_VALUE(COMPR); 478 CHECK_FLAG_VALUE(SYNC); 479 CHECK_FLAG_VALUE(IMMUTABLE); 480 CHECK_FLAG_VALUE(APPEND); 481 CHECK_FLAG_VALUE(NODUMP); 482 CHECK_FLAG_VALUE(NOATIME); 483 CHECK_FLAG_VALUE(DIRTY); 484 CHECK_FLAG_VALUE(COMPRBLK); 485 CHECK_FLAG_VALUE(NOCOMPR); 486 CHECK_FLAG_VALUE(ECOMPR); 487 CHECK_FLAG_VALUE(INDEX); 488 CHECK_FLAG_VALUE(IMAGIC); 489 CHECK_FLAG_VALUE(JOURNAL_DATA); 490 CHECK_FLAG_VALUE(NOTAIL); 491 CHECK_FLAG_VALUE(DIRSYNC); 492 CHECK_FLAG_VALUE(TOPDIR); 493 CHECK_FLAG_VALUE(HUGE_FILE); 494 CHECK_FLAG_VALUE(EXTENTS); 495 CHECK_FLAG_VALUE(EA_INODE); 496 CHECK_FLAG_VALUE(EOFBLOCKS); 497 CHECK_FLAG_VALUE(RESERVED); 498 } 499 500 /* Used to pass group descriptor data when online resize is done */ 501 struct ext4_new_group_input { 502 __u32 group; /* Group number for this data */ 503 __u64 block_bitmap; /* Absolute block number of block bitmap */ 504 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 505 __u64 inode_table; /* Absolute block number of inode table start */ 506 __u32 blocks_count; /* Total number of blocks in this group */ 507 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 508 __u16 unused; 509 }; 510 511 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 512 struct compat_ext4_new_group_input { 513 u32 group; 514 compat_u64 block_bitmap; 515 compat_u64 inode_bitmap; 516 compat_u64 inode_table; 517 u32 blocks_count; 518 u16 reserved_blocks; 519 u16 unused; 520 }; 521 #endif 522 523 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 524 struct ext4_new_group_data { 525 __u32 group; 526 __u64 block_bitmap; 527 __u64 inode_bitmap; 528 __u64 inode_table; 529 __u32 blocks_count; 530 __u16 reserved_blocks; 531 __u16 unused; 532 __u32 free_blocks_count; 533 }; 534 535 /* Indexes used to index group tables in ext4_new_group_data */ 536 enum { 537 BLOCK_BITMAP = 0, /* block bitmap */ 538 INODE_BITMAP, /* inode bitmap */ 539 INODE_TABLE, /* inode tables */ 540 GROUP_TABLE_COUNT, 541 }; 542 543 /* 544 * Flags used by ext4_map_blocks() 545 */ 546 /* Allocate any needed blocks and/or convert an unitialized 547 extent to be an initialized ext4 */ 548 #define EXT4_GET_BLOCKS_CREATE 0x0001 549 /* Request the creation of an unitialized extent */ 550 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 551 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ 552 EXT4_GET_BLOCKS_CREATE) 553 /* Caller is from the delayed allocation writeout path, 554 so set the magic i_delalloc_reserve_flag after taking the 555 inode allocation semaphore for */ 556 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 557 /* caller is from the direct IO path, request to creation of an 558 unitialized extents if not allocated, split the uninitialized 559 extent if blocks has been preallocated already*/ 560 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 561 #define EXT4_GET_BLOCKS_CONVERT 0x0010 562 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 563 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 564 /* Convert extent to initialized after IO complete */ 565 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 566 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 567 /* Punch out blocks of an extent */ 568 #define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020 569 /* Don't normalize allocation size (used for fallocate) */ 570 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 571 /* Request will not result in inode size update (user for fallocate) */ 572 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 573 /* Do not take i_data_sem locking in ext4_map_blocks */ 574 #define EXT4_GET_BLOCKS_NO_LOCK 0x0100 575 576 /* 577 * Flags used by ext4_free_blocks 578 */ 579 #define EXT4_FREE_BLOCKS_METADATA 0x0001 580 #define EXT4_FREE_BLOCKS_FORGET 0x0002 581 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 582 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 583 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 584 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 585 586 /* 587 * Flags used by ext4_discard_partial_page_buffers 588 */ 589 #define EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED 0x0001 590 591 /* 592 * ioctl commands 593 */ 594 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 595 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 596 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 597 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 598 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 599 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 600 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 601 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 602 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 603 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 604 #define EXT4_IOC_MIGRATE _IO('f', 9) 605 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 606 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 607 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 608 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 609 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 610 611 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 612 /* 613 * ioctl commands in 32 bit emulation 614 */ 615 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 616 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 617 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 618 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 619 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 620 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 621 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 622 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 623 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 624 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 625 #endif 626 627 /* Max physical block we can address w/o extents */ 628 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 629 630 /* 631 * Structure of an inode on the disk 632 */ 633 struct ext4_inode { 634 __le16 i_mode; /* File mode */ 635 __le16 i_uid; /* Low 16 bits of Owner Uid */ 636 __le32 i_size_lo; /* Size in bytes */ 637 __le32 i_atime; /* Access time */ 638 __le32 i_ctime; /* Inode Change time */ 639 __le32 i_mtime; /* Modification time */ 640 __le32 i_dtime; /* Deletion Time */ 641 __le16 i_gid; /* Low 16 bits of Group Id */ 642 __le16 i_links_count; /* Links count */ 643 __le32 i_blocks_lo; /* Blocks count */ 644 __le32 i_flags; /* File flags */ 645 union { 646 struct { 647 __le32 l_i_version; 648 } linux1; 649 struct { 650 __u32 h_i_translator; 651 } hurd1; 652 struct { 653 __u32 m_i_reserved1; 654 } masix1; 655 } osd1; /* OS dependent 1 */ 656 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 657 __le32 i_generation; /* File version (for NFS) */ 658 __le32 i_file_acl_lo; /* File ACL */ 659 __le32 i_size_high; 660 __le32 i_obso_faddr; /* Obsoleted fragment address */ 661 union { 662 struct { 663 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 664 __le16 l_i_file_acl_high; 665 __le16 l_i_uid_high; /* these 2 fields */ 666 __le16 l_i_gid_high; /* were reserved2[0] */ 667 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 668 __le16 l_i_reserved; 669 } linux2; 670 struct { 671 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 672 __u16 h_i_mode_high; 673 __u16 h_i_uid_high; 674 __u16 h_i_gid_high; 675 __u32 h_i_author; 676 } hurd2; 677 struct { 678 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 679 __le16 m_i_file_acl_high; 680 __u32 m_i_reserved2[2]; 681 } masix2; 682 } osd2; /* OS dependent 2 */ 683 __le16 i_extra_isize; 684 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 685 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 686 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 687 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 688 __le32 i_crtime; /* File Creation time */ 689 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 690 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 691 }; 692 693 struct move_extent { 694 __u32 reserved; /* should be zero */ 695 __u32 donor_fd; /* donor file descriptor */ 696 __u64 orig_start; /* logical start offset in block for orig */ 697 __u64 donor_start; /* logical start offset in block for donor */ 698 __u64 len; /* block length to be moved */ 699 __u64 moved_len; /* moved block length */ 700 }; 701 702 #define EXT4_EPOCH_BITS 2 703 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 704 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 705 706 /* 707 * Extended fields will fit into an inode if the filesystem was formatted 708 * with large inodes (-I 256 or larger) and there are not currently any EAs 709 * consuming all of the available space. For new inodes we always reserve 710 * enough space for the kernel's known extended fields, but for inodes 711 * created with an old kernel this might not have been the case. None of 712 * the extended inode fields is critical for correct filesystem operation. 713 * This macro checks if a certain field fits in the inode. Note that 714 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 715 */ 716 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 717 ((offsetof(typeof(*ext4_inode), field) + \ 718 sizeof((ext4_inode)->field)) \ 719 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 720 (einode)->i_extra_isize)) \ 721 722 static inline __le32 ext4_encode_extra_time(struct timespec *time) 723 { 724 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 725 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | 726 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); 727 } 728 729 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 730 { 731 if (sizeof(time->tv_sec) > 4) 732 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 733 << 32; 734 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 735 } 736 737 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 738 do { \ 739 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 740 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 741 (raw_inode)->xtime ## _extra = \ 742 ext4_encode_extra_time(&(inode)->xtime); \ 743 } while (0) 744 745 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 746 do { \ 747 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 748 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 749 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 750 (raw_inode)->xtime ## _extra = \ 751 ext4_encode_extra_time(&(einode)->xtime); \ 752 } while (0) 753 754 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 755 do { \ 756 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 757 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 758 ext4_decode_extra_time(&(inode)->xtime, \ 759 raw_inode->xtime ## _extra); \ 760 else \ 761 (inode)->xtime.tv_nsec = 0; \ 762 } while (0) 763 764 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 765 do { \ 766 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 767 (einode)->xtime.tv_sec = \ 768 (signed)le32_to_cpu((raw_inode)->xtime); \ 769 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 770 ext4_decode_extra_time(&(einode)->xtime, \ 771 raw_inode->xtime ## _extra); \ 772 else \ 773 (einode)->xtime.tv_nsec = 0; \ 774 } while (0) 775 776 #define i_disk_version osd1.linux1.l_i_version 777 778 #if defined(__KERNEL__) || defined(__linux__) 779 #define i_reserved1 osd1.linux1.l_i_reserved1 780 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 781 #define i_blocks_high osd2.linux2.l_i_blocks_high 782 #define i_uid_low i_uid 783 #define i_gid_low i_gid 784 #define i_uid_high osd2.linux2.l_i_uid_high 785 #define i_gid_high osd2.linux2.l_i_gid_high 786 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 787 788 #elif defined(__GNU__) 789 790 #define i_translator osd1.hurd1.h_i_translator 791 #define i_uid_high osd2.hurd2.h_i_uid_high 792 #define i_gid_high osd2.hurd2.h_i_gid_high 793 #define i_author osd2.hurd2.h_i_author 794 795 #elif defined(__masix__) 796 797 #define i_reserved1 osd1.masix1.m_i_reserved1 798 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 799 #define i_reserved2 osd2.masix2.m_i_reserved2 800 801 #endif /* defined(__KERNEL__) || defined(__linux__) */ 802 803 /* 804 * storage for cached extent 805 * If ec_len == 0, then the cache is invalid. 806 * If ec_start == 0, then the cache represents a gap (null mapping) 807 */ 808 struct ext4_ext_cache { 809 ext4_fsblk_t ec_start; 810 ext4_lblk_t ec_block; 811 __u32 ec_len; /* must be 32bit to return holes */ 812 }; 813 814 /* 815 * fourth extended file system inode data in memory 816 */ 817 struct ext4_inode_info { 818 __le32 i_data[15]; /* unconverted */ 819 __u32 i_dtime; 820 ext4_fsblk_t i_file_acl; 821 822 /* 823 * i_block_group is the number of the block group which contains 824 * this file's inode. Constant across the lifetime of the inode, 825 * it is ued for making block allocation decisions - we try to 826 * place a file's data blocks near its inode block, and new inodes 827 * near to their parent directory's inode. 828 */ 829 ext4_group_t i_block_group; 830 ext4_lblk_t i_dir_start_lookup; 831 #if (BITS_PER_LONG < 64) 832 unsigned long i_state_flags; /* Dynamic state flags */ 833 #endif 834 unsigned long i_flags; 835 836 #ifdef CONFIG_EXT4_FS_XATTR 837 /* 838 * Extended attributes can be read independently of the main file 839 * data. Taking i_mutex even when reading would cause contention 840 * between readers of EAs and writers of regular file data, so 841 * instead we synchronize on xattr_sem when reading or changing 842 * EAs. 843 */ 844 struct rw_semaphore xattr_sem; 845 #endif 846 847 struct list_head i_orphan; /* unlinked but open inodes */ 848 849 /* 850 * i_disksize keeps track of what the inode size is ON DISK, not 851 * in memory. During truncate, i_size is set to the new size by 852 * the VFS prior to calling ext4_truncate(), but the filesystem won't 853 * set i_disksize to 0 until the truncate is actually under way. 854 * 855 * The intent is that i_disksize always represents the blocks which 856 * are used by this file. This allows recovery to restart truncate 857 * on orphans if we crash during truncate. We actually write i_disksize 858 * into the on-disk inode when writing inodes out, instead of i_size. 859 * 860 * The only time when i_disksize and i_size may be different is when 861 * a truncate is in progress. The only things which change i_disksize 862 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 863 */ 864 loff_t i_disksize; 865 866 /* 867 * i_data_sem is for serialising ext4_truncate() against 868 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 869 * data tree are chopped off during truncate. We can't do that in 870 * ext4 because whenever we perform intermediate commits during 871 * truncate, the inode and all the metadata blocks *must* be in a 872 * consistent state which allows truncation of the orphans to restart 873 * during recovery. Hence we must fix the get_block-vs-truncate race 874 * by other means, so we have i_data_sem. 875 */ 876 struct rw_semaphore i_data_sem; 877 struct inode vfs_inode; 878 struct jbd2_inode *jinode; 879 880 struct ext4_ext_cache i_cached_extent; 881 /* 882 * File creation time. Its function is same as that of 883 * struct timespec i_{a,c,m}time in the generic inode. 884 */ 885 struct timespec i_crtime; 886 887 /* mballoc */ 888 struct list_head i_prealloc_list; 889 spinlock_t i_prealloc_lock; 890 891 /* ialloc */ 892 ext4_group_t i_last_alloc_group; 893 894 /* allocation reservation info for delalloc */ 895 /* In case of bigalloc, these refer to clusters rather than blocks */ 896 unsigned int i_reserved_data_blocks; 897 unsigned int i_reserved_meta_blocks; 898 unsigned int i_allocated_meta_blocks; 899 ext4_lblk_t i_da_metadata_calc_last_lblock; 900 int i_da_metadata_calc_len; 901 902 /* on-disk additional length */ 903 __u16 i_extra_isize; 904 905 #ifdef CONFIG_QUOTA 906 /* quota space reservation, managed internally by quota code */ 907 qsize_t i_reserved_quota; 908 #endif 909 910 /* completed IOs that might need unwritten extents handling */ 911 struct list_head i_completed_io_list; 912 spinlock_t i_completed_io_lock; 913 atomic_t i_ioend_count; /* Number of outstanding io_end structs */ 914 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 915 916 spinlock_t i_block_reservation_lock; 917 918 /* 919 * Transactions that contain inode's metadata needed to complete 920 * fsync and fdatasync, respectively. 921 */ 922 tid_t i_sync_tid; 923 tid_t i_datasync_tid; 924 925 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 926 __u32 i_csum_seed; 927 }; 928 929 /* 930 * File system states 931 */ 932 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 933 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 934 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 935 936 /* 937 * Misc. filesystem flags 938 */ 939 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 940 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 941 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 942 943 /* 944 * Mount flags 945 */ 946 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 947 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 948 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 949 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 950 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 951 #define EXT4_MOUNT_ERRORS_MASK 0x00070 952 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 953 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 954 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 955 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 956 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 957 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 958 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 959 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 960 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 961 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 962 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 963 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 964 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 965 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 966 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 967 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 968 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 969 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 970 #define EXT4_MOUNT_MBLK_IO_SUBMIT 0x4000000 /* multi-block io submits */ 971 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 972 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 973 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 974 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 975 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 976 977 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 978 specified delalloc */ 979 980 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 981 ~EXT4_MOUNT_##opt 982 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 983 EXT4_MOUNT_##opt 984 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 985 EXT4_MOUNT_##opt) 986 987 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 988 ~EXT4_MOUNT2_##opt 989 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 990 EXT4_MOUNT2_##opt 991 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 992 EXT4_MOUNT2_##opt) 993 994 #define ext4_test_and_set_bit __test_and_set_bit_le 995 #define ext4_set_bit __set_bit_le 996 #define ext4_set_bit_atomic ext2_set_bit_atomic 997 #define ext4_test_and_clear_bit __test_and_clear_bit_le 998 #define ext4_clear_bit __clear_bit_le 999 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1000 #define ext4_test_bit test_bit_le 1001 #define ext4_find_next_zero_bit find_next_zero_bit_le 1002 #define ext4_find_next_bit find_next_bit_le 1003 1004 extern void ext4_set_bits(void *bm, int cur, int len); 1005 1006 /* 1007 * Maximal mount counts between two filesystem checks 1008 */ 1009 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1010 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1011 1012 /* 1013 * Behaviour when detecting errors 1014 */ 1015 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1016 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1017 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1018 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1019 1020 /* Metadata checksum algorithm codes */ 1021 #define EXT4_CRC32C_CHKSUM 1 1022 1023 /* 1024 * Structure of the super block 1025 */ 1026 struct ext4_super_block { 1027 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1028 __le32 s_blocks_count_lo; /* Blocks count */ 1029 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1030 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1031 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1032 __le32 s_first_data_block; /* First Data Block */ 1033 __le32 s_log_block_size; /* Block size */ 1034 __le32 s_log_cluster_size; /* Allocation cluster size */ 1035 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1036 __le32 s_clusters_per_group; /* # Clusters per group */ 1037 __le32 s_inodes_per_group; /* # Inodes per group */ 1038 __le32 s_mtime; /* Mount time */ 1039 /*30*/ __le32 s_wtime; /* Write time */ 1040 __le16 s_mnt_count; /* Mount count */ 1041 __le16 s_max_mnt_count; /* Maximal mount count */ 1042 __le16 s_magic; /* Magic signature */ 1043 __le16 s_state; /* File system state */ 1044 __le16 s_errors; /* Behaviour when detecting errors */ 1045 __le16 s_minor_rev_level; /* minor revision level */ 1046 /*40*/ __le32 s_lastcheck; /* time of last check */ 1047 __le32 s_checkinterval; /* max. time between checks */ 1048 __le32 s_creator_os; /* OS */ 1049 __le32 s_rev_level; /* Revision level */ 1050 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1051 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1052 /* 1053 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1054 * 1055 * Note: the difference between the compatible feature set and 1056 * the incompatible feature set is that if there is a bit set 1057 * in the incompatible feature set that the kernel doesn't 1058 * know about, it should refuse to mount the filesystem. 1059 * 1060 * e2fsck's requirements are more strict; if it doesn't know 1061 * about a feature in either the compatible or incompatible 1062 * feature set, it must abort and not try to meddle with 1063 * things it doesn't understand... 1064 */ 1065 __le32 s_first_ino; /* First non-reserved inode */ 1066 __le16 s_inode_size; /* size of inode structure */ 1067 __le16 s_block_group_nr; /* block group # of this superblock */ 1068 __le32 s_feature_compat; /* compatible feature set */ 1069 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1070 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1071 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1072 /*78*/ char s_volume_name[16]; /* volume name */ 1073 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 1074 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1075 /* 1076 * Performance hints. Directory preallocation should only 1077 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1078 */ 1079 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1080 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1081 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1082 /* 1083 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1084 */ 1085 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1086 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1087 __le32 s_journal_dev; /* device number of journal file */ 1088 __le32 s_last_orphan; /* start of list of inodes to delete */ 1089 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1090 __u8 s_def_hash_version; /* Default hash version to use */ 1091 __u8 s_jnl_backup_type; 1092 __le16 s_desc_size; /* size of group descriptor */ 1093 /*100*/ __le32 s_default_mount_opts; 1094 __le32 s_first_meta_bg; /* First metablock block group */ 1095 __le32 s_mkfs_time; /* When the filesystem was created */ 1096 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1097 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1098 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1099 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1100 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1101 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1102 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1103 __le32 s_flags; /* Miscellaneous flags */ 1104 __le16 s_raid_stride; /* RAID stride */ 1105 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1106 __le64 s_mmp_block; /* Block for multi-mount protection */ 1107 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1108 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1109 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1110 __le16 s_reserved_pad; 1111 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1112 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1113 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1114 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1115 snapshot's future use */ 1116 __le32 s_snapshot_list; /* inode number of the head of the 1117 on-disk snapshot list */ 1118 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1119 __le32 s_error_count; /* number of fs errors */ 1120 __le32 s_first_error_time; /* first time an error happened */ 1121 __le32 s_first_error_ino; /* inode involved in first error */ 1122 __le64 s_first_error_block; /* block involved of first error */ 1123 __u8 s_first_error_func[32]; /* function where the error happened */ 1124 __le32 s_first_error_line; /* line number where error happened */ 1125 __le32 s_last_error_time; /* most recent time of an error */ 1126 __le32 s_last_error_ino; /* inode involved in last error */ 1127 __le32 s_last_error_line; /* line number where error happened */ 1128 __le64 s_last_error_block; /* block involved of last error */ 1129 __u8 s_last_error_func[32]; /* function where the error happened */ 1130 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1131 __u8 s_mount_opts[64]; 1132 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1133 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1134 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1135 __le32 s_reserved[108]; /* Padding to the end of the block */ 1136 __le32 s_checksum; /* crc32c(superblock) */ 1137 }; 1138 1139 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1140 1141 #ifdef __KERNEL__ 1142 1143 /* 1144 * run-time mount flags 1145 */ 1146 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1147 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1148 1149 /* 1150 * fourth extended-fs super-block data in memory 1151 */ 1152 struct ext4_sb_info { 1153 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1154 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1155 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1156 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1157 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1158 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1159 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1160 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1161 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1162 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1163 unsigned long s_overhead; /* # of fs overhead clusters */ 1164 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1165 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1166 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1167 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1168 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1169 struct buffer_head **s_group_desc; 1170 unsigned int s_mount_opt; 1171 unsigned int s_mount_opt2; 1172 unsigned int s_mount_flags; 1173 unsigned int s_def_mount_opt; 1174 ext4_fsblk_t s_sb_block; 1175 kuid_t s_resuid; 1176 kgid_t s_resgid; 1177 unsigned short s_mount_state; 1178 unsigned short s_pad; 1179 int s_addr_per_block_bits; 1180 int s_desc_per_block_bits; 1181 int s_inode_size; 1182 int s_first_ino; 1183 unsigned int s_inode_readahead_blks; 1184 unsigned int s_inode_goal; 1185 spinlock_t s_next_gen_lock; 1186 u32 s_next_generation; 1187 u32 s_hash_seed[4]; 1188 int s_def_hash_version; 1189 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1190 struct percpu_counter s_freeclusters_counter; 1191 struct percpu_counter s_freeinodes_counter; 1192 struct percpu_counter s_dirs_counter; 1193 struct percpu_counter s_dirtyclusters_counter; 1194 struct blockgroup_lock *s_blockgroup_lock; 1195 struct proc_dir_entry *s_proc; 1196 struct kobject s_kobj; 1197 struct completion s_kobj_unregister; 1198 struct super_block *s_sb; 1199 1200 /* Journaling */ 1201 struct journal_s *s_journal; 1202 struct list_head s_orphan; 1203 struct mutex s_orphan_lock; 1204 unsigned long s_resize_flags; /* Flags indicating if there 1205 is a resizer */ 1206 unsigned long s_commit_interval; 1207 u32 s_max_batch_time; 1208 u32 s_min_batch_time; 1209 struct block_device *journal_bdev; 1210 #ifdef CONFIG_QUOTA 1211 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ 1212 int s_jquota_fmt; /* Format of quota to use */ 1213 #endif 1214 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1215 struct rb_root system_blks; 1216 1217 #ifdef EXTENTS_STATS 1218 /* ext4 extents stats */ 1219 unsigned long s_ext_min; 1220 unsigned long s_ext_max; 1221 unsigned long s_depth_max; 1222 spinlock_t s_ext_stats_lock; 1223 unsigned long s_ext_blocks; 1224 unsigned long s_ext_extents; 1225 #endif 1226 1227 /* for buddy allocator */ 1228 struct ext4_group_info ***s_group_info; 1229 struct inode *s_buddy_cache; 1230 spinlock_t s_md_lock; 1231 unsigned short *s_mb_offsets; 1232 unsigned int *s_mb_maxs; 1233 unsigned int s_group_info_size; 1234 1235 /* tunables */ 1236 unsigned long s_stripe; 1237 unsigned int s_mb_stream_request; 1238 unsigned int s_mb_max_to_scan; 1239 unsigned int s_mb_min_to_scan; 1240 unsigned int s_mb_stats; 1241 unsigned int s_mb_order2_reqs; 1242 unsigned int s_mb_group_prealloc; 1243 unsigned int s_max_writeback_mb_bump; 1244 unsigned int s_max_dir_size_kb; 1245 /* where last allocation was done - for stream allocation */ 1246 unsigned long s_mb_last_group; 1247 unsigned long s_mb_last_start; 1248 1249 /* stats for buddy allocator */ 1250 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1251 atomic_t s_bal_success; /* we found long enough chunks */ 1252 atomic_t s_bal_allocated; /* in blocks */ 1253 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1254 atomic_t s_bal_goals; /* goal hits */ 1255 atomic_t s_bal_breaks; /* too long searches */ 1256 atomic_t s_bal_2orders; /* 2^order hits */ 1257 spinlock_t s_bal_lock; 1258 unsigned long s_mb_buddies_generated; 1259 unsigned long long s_mb_generation_time; 1260 atomic_t s_mb_lost_chunks; 1261 atomic_t s_mb_preallocated; 1262 atomic_t s_mb_discarded; 1263 atomic_t s_lock_busy; 1264 1265 /* locality groups */ 1266 struct ext4_locality_group __percpu *s_locality_groups; 1267 1268 /* for write statistics */ 1269 unsigned long s_sectors_written_start; 1270 u64 s_kbytes_written; 1271 1272 /* the size of zero-out chunk */ 1273 unsigned int s_extent_max_zeroout_kb; 1274 1275 unsigned int s_log_groups_per_flex; 1276 struct flex_groups *s_flex_groups; 1277 ext4_group_t s_flex_groups_allocated; 1278 1279 /* workqueue for dio unwritten */ 1280 struct workqueue_struct *dio_unwritten_wq; 1281 1282 /* timer for periodic error stats printing */ 1283 struct timer_list s_err_report; 1284 1285 /* Lazy inode table initialization info */ 1286 struct ext4_li_request *s_li_request; 1287 /* Wait multiplier for lazy initialization thread */ 1288 unsigned int s_li_wait_mult; 1289 1290 /* Kernel thread for multiple mount protection */ 1291 struct task_struct *s_mmp_tsk; 1292 1293 /* record the last minlen when FITRIM is called. */ 1294 atomic_t s_last_trim_minblks; 1295 1296 /* Reference to checksum algorithm driver via cryptoapi */ 1297 struct crypto_shash *s_chksum_driver; 1298 1299 /* Precomputed FS UUID checksum for seeding other checksums */ 1300 __u32 s_csum_seed; 1301 }; 1302 1303 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1304 { 1305 return sb->s_fs_info; 1306 } 1307 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1308 { 1309 return container_of(inode, struct ext4_inode_info, vfs_inode); 1310 } 1311 1312 static inline struct timespec ext4_current_time(struct inode *inode) 1313 { 1314 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1315 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1316 } 1317 1318 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1319 { 1320 return ino == EXT4_ROOT_INO || 1321 ino == EXT4_USR_QUOTA_INO || 1322 ino == EXT4_GRP_QUOTA_INO || 1323 ino == EXT4_JOURNAL_INO || 1324 ino == EXT4_RESIZE_INO || 1325 (ino >= EXT4_FIRST_INO(sb) && 1326 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1327 } 1328 1329 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 1330 struct ext4_io_end *io_end) 1331 { 1332 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 1333 io_end->flag |= EXT4_IO_END_UNWRITTEN; 1334 atomic_inc(&EXT4_I(inode)->i_unwritten); 1335 } 1336 } 1337 1338 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode) 1339 { 1340 return inode->i_private; 1341 } 1342 1343 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io) 1344 { 1345 inode->i_private = io; 1346 } 1347 1348 /* 1349 * Inode dynamic state flags 1350 */ 1351 enum { 1352 EXT4_STATE_JDATA, /* journaled data exists */ 1353 EXT4_STATE_NEW, /* inode is newly created */ 1354 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1355 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1356 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1357 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1358 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1359 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1360 EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */ 1361 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read 1362 nolocking */ 1363 }; 1364 1365 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1366 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1367 { \ 1368 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1369 } \ 1370 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1371 { \ 1372 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1373 } \ 1374 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1375 { \ 1376 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1377 } 1378 1379 EXT4_INODE_BIT_FNS(flag, flags, 0) 1380 #if (BITS_PER_LONG < 64) 1381 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1382 1383 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1384 { 1385 (ei)->i_state_flags = 0; 1386 } 1387 #else 1388 EXT4_INODE_BIT_FNS(state, flags, 32) 1389 1390 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1391 { 1392 /* We depend on the fact that callers will set i_flags */ 1393 } 1394 #endif 1395 #else 1396 /* Assume that user mode programs are passing in an ext4fs superblock, not 1397 * a kernel struct super_block. This will allow us to call the feature-test 1398 * macros from user land. */ 1399 #define EXT4_SB(sb) (sb) 1400 #endif 1401 1402 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1403 1404 /* 1405 * Codes for operating systems 1406 */ 1407 #define EXT4_OS_LINUX 0 1408 #define EXT4_OS_HURD 1 1409 #define EXT4_OS_MASIX 2 1410 #define EXT4_OS_FREEBSD 3 1411 #define EXT4_OS_LITES 4 1412 1413 /* 1414 * Revision levels 1415 */ 1416 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1417 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1418 1419 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1420 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1421 1422 #define EXT4_GOOD_OLD_INODE_SIZE 128 1423 1424 /* 1425 * Feature set definitions 1426 */ 1427 1428 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1429 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1430 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1431 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1432 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1433 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1434 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1435 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1436 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1437 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1438 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1439 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1440 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1441 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1442 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1443 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1444 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1445 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1446 1447 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1448 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1449 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1450 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1451 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1452 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1453 1454 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1455 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1456 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1457 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1458 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1459 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1460 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1461 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1462 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1463 /* 1464 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1465 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1466 * all other data structures' checksums. However, the METADATA_CSUM and 1467 * GDT_CSUM bits are mutually exclusive. 1468 */ 1469 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1470 1471 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1472 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1473 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1474 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1475 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1476 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1477 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1478 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1479 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1480 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1481 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1482 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */ 1483 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1484 #define EXT4_FEATURE_INCOMPAT_INLINEDATA 0x8000 /* data in inode */ 1485 1486 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1487 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1488 EXT4_FEATURE_INCOMPAT_META_BG) 1489 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1490 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1491 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1492 1493 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1494 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1495 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1496 EXT4_FEATURE_INCOMPAT_META_BG) 1497 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1498 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1499 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1500 1501 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 1502 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1503 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1504 EXT4_FEATURE_INCOMPAT_META_BG| \ 1505 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1506 EXT4_FEATURE_INCOMPAT_64BIT| \ 1507 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1508 EXT4_FEATURE_INCOMPAT_MMP) 1509 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1510 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1511 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1512 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1513 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1514 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1515 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1516 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1517 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1518 EXT4_FEATURE_RO_COMPAT_QUOTA) 1519 1520 /* 1521 * Default values for user and/or group using reserved blocks 1522 */ 1523 #define EXT4_DEF_RESUID 0 1524 #define EXT4_DEF_RESGID 0 1525 1526 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1527 1528 /* 1529 * Default mount options 1530 */ 1531 #define EXT4_DEFM_DEBUG 0x0001 1532 #define EXT4_DEFM_BSDGROUPS 0x0002 1533 #define EXT4_DEFM_XATTR_USER 0x0004 1534 #define EXT4_DEFM_ACL 0x0008 1535 #define EXT4_DEFM_UID16 0x0010 1536 #define EXT4_DEFM_JMODE 0x0060 1537 #define EXT4_DEFM_JMODE_DATA 0x0020 1538 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1539 #define EXT4_DEFM_JMODE_WBACK 0x0060 1540 #define EXT4_DEFM_NOBARRIER 0x0100 1541 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1542 #define EXT4_DEFM_DISCARD 0x0400 1543 #define EXT4_DEFM_NODELALLOC 0x0800 1544 1545 /* 1546 * Default journal batch times 1547 */ 1548 #define EXT4_DEF_MIN_BATCH_TIME 0 1549 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1550 1551 /* 1552 * Minimum number of groups in a flexgroup before we separate out 1553 * directories into the first block group of a flexgroup 1554 */ 1555 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1556 1557 /* 1558 * Structure of a directory entry 1559 */ 1560 #define EXT4_NAME_LEN 255 1561 1562 struct ext4_dir_entry { 1563 __le32 inode; /* Inode number */ 1564 __le16 rec_len; /* Directory entry length */ 1565 __le16 name_len; /* Name length */ 1566 char name[EXT4_NAME_LEN]; /* File name */ 1567 }; 1568 1569 /* 1570 * The new version of the directory entry. Since EXT4 structures are 1571 * stored in intel byte order, and the name_len field could never be 1572 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1573 * file_type field. 1574 */ 1575 struct ext4_dir_entry_2 { 1576 __le32 inode; /* Inode number */ 1577 __le16 rec_len; /* Directory entry length */ 1578 __u8 name_len; /* Name length */ 1579 __u8 file_type; 1580 char name[EXT4_NAME_LEN]; /* File name */ 1581 }; 1582 1583 /* 1584 * This is a bogus directory entry at the end of each leaf block that 1585 * records checksums. 1586 */ 1587 struct ext4_dir_entry_tail { 1588 __le32 det_reserved_zero1; /* Pretend to be unused */ 1589 __le16 det_rec_len; /* 12 */ 1590 __u8 det_reserved_zero2; /* Zero name length */ 1591 __u8 det_reserved_ft; /* 0xDE, fake file type */ 1592 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1593 }; 1594 1595 /* 1596 * Ext4 directory file types. Only the low 3 bits are used. The 1597 * other bits are reserved for now. 1598 */ 1599 #define EXT4_FT_UNKNOWN 0 1600 #define EXT4_FT_REG_FILE 1 1601 #define EXT4_FT_DIR 2 1602 #define EXT4_FT_CHRDEV 3 1603 #define EXT4_FT_BLKDEV 4 1604 #define EXT4_FT_FIFO 5 1605 #define EXT4_FT_SOCK 6 1606 #define EXT4_FT_SYMLINK 7 1607 1608 #define EXT4_FT_MAX 8 1609 1610 #define EXT4_FT_DIR_CSUM 0xDE 1611 1612 /* 1613 * EXT4_DIR_PAD defines the directory entries boundaries 1614 * 1615 * NOTE: It must be a multiple of 4 1616 */ 1617 #define EXT4_DIR_PAD 4 1618 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1619 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1620 ~EXT4_DIR_ROUND) 1621 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1622 1623 /* 1624 * If we ever get support for fs block sizes > page_size, we'll need 1625 * to remove the #if statements in the next two functions... 1626 */ 1627 static inline unsigned int 1628 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1629 { 1630 unsigned len = le16_to_cpu(dlen); 1631 1632 #if (PAGE_CACHE_SIZE >= 65536) 1633 if (len == EXT4_MAX_REC_LEN || len == 0) 1634 return blocksize; 1635 return (len & 65532) | ((len & 3) << 16); 1636 #else 1637 return len; 1638 #endif 1639 } 1640 1641 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1642 { 1643 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1644 BUG(); 1645 #if (PAGE_CACHE_SIZE >= 65536) 1646 if (len < 65536) 1647 return cpu_to_le16(len); 1648 if (len == blocksize) { 1649 if (blocksize == 65536) 1650 return cpu_to_le16(EXT4_MAX_REC_LEN); 1651 else 1652 return cpu_to_le16(0); 1653 } 1654 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 1655 #else 1656 return cpu_to_le16(len); 1657 #endif 1658 } 1659 1660 /* 1661 * Hash Tree Directory indexing 1662 * (c) Daniel Phillips, 2001 1663 */ 1664 1665 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 1666 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 1667 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 1668 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 1669 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 1670 1671 /* Legal values for the dx_root hash_version field: */ 1672 1673 #define DX_HASH_LEGACY 0 1674 #define DX_HASH_HALF_MD4 1 1675 #define DX_HASH_TEA 2 1676 #define DX_HASH_LEGACY_UNSIGNED 3 1677 #define DX_HASH_HALF_MD4_UNSIGNED 4 1678 #define DX_HASH_TEA_UNSIGNED 5 1679 1680 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 1681 const void *address, unsigned int length) 1682 { 1683 struct { 1684 struct shash_desc shash; 1685 char ctx[4]; 1686 } desc; 1687 int err; 1688 1689 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 1690 1691 desc.shash.tfm = sbi->s_chksum_driver; 1692 desc.shash.flags = 0; 1693 *(u32 *)desc.ctx = crc; 1694 1695 err = crypto_shash_update(&desc.shash, address, length); 1696 BUG_ON(err); 1697 1698 return *(u32 *)desc.ctx; 1699 } 1700 1701 #ifdef __KERNEL__ 1702 1703 /* hash info structure used by the directory hash */ 1704 struct dx_hash_info 1705 { 1706 u32 hash; 1707 u32 minor_hash; 1708 int hash_version; 1709 u32 *seed; 1710 }; 1711 1712 1713 /* 32 and 64 bit signed EOF for dx directories */ 1714 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 1715 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 1716 1717 1718 /* 1719 * Control parameters used by ext4_htree_next_block 1720 */ 1721 #define HASH_NB_ALWAYS 1 1722 1723 1724 /* 1725 * Describe an inode's exact location on disk and in memory 1726 */ 1727 struct ext4_iloc 1728 { 1729 struct buffer_head *bh; 1730 unsigned long offset; 1731 ext4_group_t block_group; 1732 }; 1733 1734 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 1735 { 1736 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 1737 } 1738 1739 /* 1740 * This structure is stuffed into the struct file's private_data field 1741 * for directories. It is where we put information so that we can do 1742 * readdir operations in hash tree order. 1743 */ 1744 struct dir_private_info { 1745 struct rb_root root; 1746 struct rb_node *curr_node; 1747 struct fname *extra_fname; 1748 loff_t last_pos; 1749 __u32 curr_hash; 1750 __u32 curr_minor_hash; 1751 __u32 next_hash; 1752 }; 1753 1754 /* calculate the first block number of the group */ 1755 static inline ext4_fsblk_t 1756 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 1757 { 1758 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 1759 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 1760 } 1761 1762 /* 1763 * Special error return code only used by dx_probe() and its callers. 1764 */ 1765 #define ERR_BAD_DX_DIR -75000 1766 1767 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, 1768 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); 1769 1770 /* 1771 * Timeout and state flag for lazy initialization inode thread. 1772 */ 1773 #define EXT4_DEF_LI_WAIT_MULT 10 1774 #define EXT4_DEF_LI_MAX_START_DELAY 5 1775 #define EXT4_LAZYINIT_QUIT 0x0001 1776 #define EXT4_LAZYINIT_RUNNING 0x0002 1777 1778 /* 1779 * Lazy inode table initialization info 1780 */ 1781 struct ext4_lazy_init { 1782 unsigned long li_state; 1783 struct list_head li_request_list; 1784 struct mutex li_list_mtx; 1785 }; 1786 1787 struct ext4_li_request { 1788 struct super_block *lr_super; 1789 struct ext4_sb_info *lr_sbi; 1790 ext4_group_t lr_next_group; 1791 struct list_head lr_request; 1792 unsigned long lr_next_sched; 1793 unsigned long lr_timeout; 1794 }; 1795 1796 struct ext4_features { 1797 struct kobject f_kobj; 1798 struct completion f_kobj_unregister; 1799 }; 1800 1801 /* 1802 * This structure will be used for multiple mount protection. It will be 1803 * written into the block number saved in the s_mmp_block field in the 1804 * superblock. Programs that check MMP should assume that if 1805 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 1806 * to use the filesystem, regardless of how old the timestamp is. 1807 */ 1808 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 1809 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 1810 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 1811 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 1812 1813 struct mmp_struct { 1814 __le32 mmp_magic; /* Magic number for MMP */ 1815 __le32 mmp_seq; /* Sequence no. updated periodically */ 1816 1817 /* 1818 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 1819 * purposes and do not affect the correctness of the algorithm 1820 */ 1821 __le64 mmp_time; /* Time last updated */ 1822 char mmp_nodename[64]; /* Node which last updated MMP block */ 1823 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 1824 1825 /* 1826 * mmp_check_interval is used to verify if the MMP block has been 1827 * updated on the block device. The value is updated based on the 1828 * maximum time to write the MMP block during an update cycle. 1829 */ 1830 __le16 mmp_check_interval; 1831 1832 __le16 mmp_pad1; 1833 __le32 mmp_pad2[226]; 1834 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 1835 }; 1836 1837 /* arguments passed to the mmp thread */ 1838 struct mmpd_data { 1839 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 1840 struct super_block *sb; /* super block of the fs */ 1841 }; 1842 1843 /* 1844 * Check interval multiplier 1845 * The MMP block is written every update interval and initially checked every 1846 * update interval x the multiplier (the value is then adapted based on the 1847 * write latency). The reason is that writes can be delayed under load and we 1848 * don't want readers to incorrectly assume that the filesystem is no longer 1849 * in use. 1850 */ 1851 #define EXT4_MMP_CHECK_MULT 2UL 1852 1853 /* 1854 * Minimum interval for MMP checking in seconds. 1855 */ 1856 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 1857 1858 /* 1859 * Maximum interval for MMP checking in seconds. 1860 */ 1861 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 1862 1863 /* 1864 * Function prototypes 1865 */ 1866 1867 /* 1868 * Ok, these declarations are also in <linux/kernel.h> but none of the 1869 * ext4 source programs needs to include it so they are duplicated here. 1870 */ 1871 # define NORET_TYPE /**/ 1872 # define ATTRIB_NORET __attribute__((noreturn)) 1873 # define NORET_AND noreturn, 1874 1875 /* bitmap.c */ 1876 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 1877 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 1878 struct ext4_group_desc *gdp, 1879 struct buffer_head *bh, int sz); 1880 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 1881 struct ext4_group_desc *gdp, 1882 struct buffer_head *bh, int sz); 1883 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 1884 struct ext4_group_desc *gdp, 1885 struct buffer_head *bh, int sz); 1886 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 1887 struct ext4_group_desc *gdp, 1888 struct buffer_head *bh, int sz); 1889 1890 /* balloc.c */ 1891 extern void ext4_validate_block_bitmap(struct super_block *sb, 1892 struct ext4_group_desc *desc, 1893 unsigned int block_group, 1894 struct buffer_head *bh); 1895 extern unsigned int ext4_block_group(struct super_block *sb, 1896 ext4_fsblk_t blocknr); 1897 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 1898 ext4_fsblk_t blocknr); 1899 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 1900 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 1901 ext4_group_t group); 1902 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 1903 ext4_fsblk_t goal, 1904 unsigned int flags, 1905 unsigned long *count, 1906 int *errp); 1907 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 1908 s64 nclusters, unsigned int flags); 1909 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 1910 extern void ext4_check_blocks_bitmap(struct super_block *); 1911 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 1912 ext4_group_t block_group, 1913 struct buffer_head ** bh); 1914 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1915 1916 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 1917 ext4_group_t block_group); 1918 extern int ext4_wait_block_bitmap(struct super_block *sb, 1919 ext4_group_t block_group, 1920 struct buffer_head *bh); 1921 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 1922 ext4_group_t block_group); 1923 extern void ext4_init_block_bitmap(struct super_block *sb, 1924 struct buffer_head *bh, 1925 ext4_group_t group, 1926 struct ext4_group_desc *desc); 1927 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 1928 ext4_group_t block_group, 1929 struct ext4_group_desc *gdp); 1930 extern unsigned ext4_num_overhead_clusters(struct super_block *sb, 1931 ext4_group_t block_group, 1932 struct ext4_group_desc *gdp); 1933 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 1934 1935 /* dir.c */ 1936 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 1937 struct file *, 1938 struct ext4_dir_entry_2 *, 1939 struct buffer_head *, unsigned int); 1940 #define ext4_check_dir_entry(dir, filp, de, bh, offset) \ 1941 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 1942 (de), (bh), (offset))) 1943 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 1944 __u32 minor_hash, 1945 struct ext4_dir_entry_2 *dirent); 1946 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 1947 1948 /* fsync.c */ 1949 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 1950 extern int ext4_flush_completed_IO(struct inode *); 1951 1952 /* hash.c */ 1953 extern int ext4fs_dirhash(const char *name, int len, struct 1954 dx_hash_info *hinfo); 1955 1956 /* ialloc.c */ 1957 extern struct inode *ext4_new_inode(handle_t *, struct inode *, umode_t, 1958 const struct qstr *qstr, __u32 goal, 1959 uid_t *owner); 1960 extern void ext4_free_inode(handle_t *, struct inode *); 1961 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 1962 extern unsigned long ext4_count_free_inodes(struct super_block *); 1963 extern unsigned long ext4_count_dirs(struct super_block *); 1964 extern void ext4_check_inodes_bitmap(struct super_block *); 1965 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 1966 extern int ext4_init_inode_table(struct super_block *sb, 1967 ext4_group_t group, int barrier); 1968 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 1969 1970 /* mballoc.c */ 1971 extern long ext4_mb_stats; 1972 extern long ext4_mb_max_to_scan; 1973 extern int ext4_mb_init(struct super_block *); 1974 extern int ext4_mb_release(struct super_block *); 1975 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 1976 struct ext4_allocation_request *, int *); 1977 extern int ext4_mb_reserve_blocks(struct super_block *, int); 1978 extern void ext4_discard_preallocations(struct inode *); 1979 extern int __init ext4_init_mballoc(void); 1980 extern void ext4_exit_mballoc(void); 1981 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 1982 struct buffer_head *bh, ext4_fsblk_t block, 1983 unsigned long count, int flags); 1984 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 1985 ext4_group_t ngroups); 1986 extern int ext4_mb_add_groupinfo(struct super_block *sb, 1987 ext4_group_t i, struct ext4_group_desc *desc); 1988 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 1989 ext4_fsblk_t block, unsigned long count); 1990 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 1991 1992 /* inode.c */ 1993 struct buffer_head *ext4_getblk(handle_t *, struct inode *, 1994 ext4_lblk_t, int, int *); 1995 struct buffer_head *ext4_bread(handle_t *, struct inode *, 1996 ext4_lblk_t, int, int *); 1997 int ext4_get_block(struct inode *inode, sector_t iblock, 1998 struct buffer_head *bh_result, int create); 1999 2000 extern struct inode *ext4_iget(struct super_block *, unsigned long); 2001 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2002 extern int ext4_setattr(struct dentry *, struct iattr *); 2003 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 2004 struct kstat *stat); 2005 extern void ext4_evict_inode(struct inode *); 2006 extern void ext4_clear_inode(struct inode *); 2007 extern int ext4_sync_inode(handle_t *, struct inode *); 2008 extern void ext4_dirty_inode(struct inode *, int); 2009 extern int ext4_change_inode_journal_flag(struct inode *, int); 2010 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2011 extern int ext4_can_truncate(struct inode *inode); 2012 extern void ext4_truncate(struct inode *); 2013 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length); 2014 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 2015 extern void ext4_set_inode_flags(struct inode *); 2016 extern void ext4_get_inode_flags(struct ext4_inode_info *); 2017 extern int ext4_alloc_da_blocks(struct inode *inode); 2018 extern void ext4_set_aops(struct inode *inode); 2019 extern int ext4_writepage_trans_blocks(struct inode *); 2020 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2021 extern int ext4_discard_partial_page_buffers(handle_t *handle, 2022 struct address_space *mapping, loff_t from, 2023 loff_t length, int flags); 2024 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 2025 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2026 extern void ext4_da_update_reserve_space(struct inode *inode, 2027 int used, int quota_claim); 2028 2029 /* indirect.c */ 2030 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2031 struct ext4_map_blocks *map, int flags); 2032 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb, 2033 const struct iovec *iov, loff_t offset, 2034 unsigned long nr_segs); 2035 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2036 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk); 2037 extern void ext4_ind_truncate(struct inode *inode); 2038 2039 /* ioctl.c */ 2040 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2041 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2042 2043 /* migrate.c */ 2044 extern int ext4_ext_migrate(struct inode *); 2045 2046 /* namei.c */ 2047 extern int ext4_dirent_csum_verify(struct inode *inode, 2048 struct ext4_dir_entry *dirent); 2049 extern int ext4_orphan_add(handle_t *, struct inode *); 2050 extern int ext4_orphan_del(handle_t *, struct inode *); 2051 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2052 __u32 start_minor_hash, __u32 *next_hash); 2053 2054 /* resize.c */ 2055 extern int ext4_group_add(struct super_block *sb, 2056 struct ext4_new_group_data *input); 2057 extern int ext4_group_extend(struct super_block *sb, 2058 struct ext4_super_block *es, 2059 ext4_fsblk_t n_blocks_count); 2060 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2061 2062 /* super.c */ 2063 extern int ext4_calculate_overhead(struct super_block *sb); 2064 extern int ext4_superblock_csum_verify(struct super_block *sb, 2065 struct ext4_super_block *es); 2066 extern void ext4_superblock_csum_set(struct super_block *sb, 2067 struct ext4_super_block *es); 2068 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 2069 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 2070 extern void ext4_kvfree(void *ptr); 2071 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2072 ext4_group_t ngroup); 2073 extern __printf(4, 5) 2074 void __ext4_error(struct super_block *, const char *, unsigned int, 2075 const char *, ...); 2076 #define ext4_error(sb, message...) __ext4_error(sb, __func__, \ 2077 __LINE__, ## message) 2078 extern __printf(5, 6) 2079 void ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2080 const char *, ...); 2081 extern __printf(5, 6) 2082 void ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2083 const char *, ...); 2084 extern void __ext4_std_error(struct super_block *, const char *, 2085 unsigned int, int); 2086 extern __printf(4, 5) 2087 void __ext4_abort(struct super_block *, const char *, unsigned int, 2088 const char *, ...); 2089 #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \ 2090 __LINE__, ## message) 2091 extern __printf(4, 5) 2092 void __ext4_warning(struct super_block *, const char *, unsigned int, 2093 const char *, ...); 2094 #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \ 2095 __LINE__, ## message) 2096 extern __printf(3, 4) 2097 void ext4_msg(struct super_block *, const char *, const char *, ...); 2098 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2099 const char *, unsigned int, const char *); 2100 #define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \ 2101 __LINE__, msg) 2102 extern __printf(7, 8) 2103 void __ext4_grp_locked_error(const char *, unsigned int, 2104 struct super_block *, ext4_group_t, 2105 unsigned long, ext4_fsblk_t, 2106 const char *, ...); 2107 #define ext4_grp_locked_error(sb, grp, message...) \ 2108 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message) 2109 extern void ext4_update_dynamic_rev(struct super_block *sb); 2110 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2111 __u32 compat); 2112 extern int ext4_update_rocompat_feature(handle_t *handle, 2113 struct super_block *sb, __u32 rocompat); 2114 extern int ext4_update_incompat_feature(handle_t *handle, 2115 struct super_block *sb, __u32 incompat); 2116 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2117 struct ext4_group_desc *bg); 2118 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2119 struct ext4_group_desc *bg); 2120 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2121 struct ext4_group_desc *bg); 2122 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2123 struct ext4_group_desc *bg); 2124 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2125 struct ext4_group_desc *bg); 2126 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2127 struct ext4_group_desc *bg); 2128 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2129 struct ext4_group_desc *bg); 2130 extern void ext4_block_bitmap_set(struct super_block *sb, 2131 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2132 extern void ext4_inode_bitmap_set(struct super_block *sb, 2133 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2134 extern void ext4_inode_table_set(struct super_block *sb, 2135 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2136 extern void ext4_free_group_clusters_set(struct super_block *sb, 2137 struct ext4_group_desc *bg, 2138 __u32 count); 2139 extern void ext4_free_inodes_set(struct super_block *sb, 2140 struct ext4_group_desc *bg, __u32 count); 2141 extern void ext4_used_dirs_set(struct super_block *sb, 2142 struct ext4_group_desc *bg, __u32 count); 2143 extern void ext4_itable_unused_set(struct super_block *sb, 2144 struct ext4_group_desc *bg, __u32 count); 2145 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2146 struct ext4_group_desc *gdp); 2147 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2148 struct ext4_group_desc *gdp); 2149 2150 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2151 { 2152 return EXT4_HAS_RO_COMPAT_FEATURE(sb, 2153 EXT4_FEATURE_RO_COMPAT_GDT_CSUM | 2154 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM); 2155 } 2156 2157 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2158 { 2159 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2160 le32_to_cpu(es->s_blocks_count_lo); 2161 } 2162 2163 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2164 { 2165 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2166 le32_to_cpu(es->s_r_blocks_count_lo); 2167 } 2168 2169 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2170 { 2171 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2172 le32_to_cpu(es->s_free_blocks_count_lo); 2173 } 2174 2175 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2176 ext4_fsblk_t blk) 2177 { 2178 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2179 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2180 } 2181 2182 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2183 ext4_fsblk_t blk) 2184 { 2185 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2186 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2187 } 2188 2189 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2190 ext4_fsblk_t blk) 2191 { 2192 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2193 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2194 } 2195 2196 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 2197 { 2198 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2199 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2200 le32_to_cpu(raw_inode->i_size_lo); 2201 else 2202 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2203 } 2204 2205 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2206 { 2207 raw_inode->i_size_lo = cpu_to_le32(i_size); 2208 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2209 } 2210 2211 static inline 2212 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2213 ext4_group_t group) 2214 { 2215 struct ext4_group_info ***grp_info; 2216 long indexv, indexh; 2217 grp_info = EXT4_SB(sb)->s_group_info; 2218 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2219 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2220 return grp_info[indexv][indexh]; 2221 } 2222 2223 /* 2224 * Reading s_groups_count requires using smp_rmb() afterwards. See 2225 * the locking protocol documented in the comments of ext4_group_add() 2226 * in resize.c 2227 */ 2228 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2229 { 2230 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2231 2232 smp_rmb(); 2233 return ngroups; 2234 } 2235 2236 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2237 ext4_group_t block_group) 2238 { 2239 return block_group >> sbi->s_log_groups_per_flex; 2240 } 2241 2242 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2243 { 2244 return 1 << sbi->s_log_groups_per_flex; 2245 } 2246 2247 #define ext4_std_error(sb, errno) \ 2248 do { \ 2249 if ((errno)) \ 2250 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2251 } while (0) 2252 2253 #ifdef CONFIG_SMP 2254 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2255 * counters. So we need to make sure we have free clusters more 2256 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2257 */ 2258 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2259 #else 2260 #define EXT4_FREECLUSTERS_WATERMARK 0 2261 #endif 2262 2263 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2264 { 2265 /* 2266 * XXX: replace with spinlock if seen contended -bzzz 2267 */ 2268 down_write(&EXT4_I(inode)->i_data_sem); 2269 if (newsize > EXT4_I(inode)->i_disksize) 2270 EXT4_I(inode)->i_disksize = newsize; 2271 up_write(&EXT4_I(inode)->i_data_sem); 2272 return ; 2273 } 2274 2275 struct ext4_group_info { 2276 unsigned long bb_state; 2277 struct rb_root bb_free_root; 2278 ext4_grpblk_t bb_first_free; /* first free block */ 2279 ext4_grpblk_t bb_free; /* total free blocks */ 2280 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 2281 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 2282 struct list_head bb_prealloc_list; 2283 #ifdef DOUBLE_CHECK 2284 void *bb_bitmap; 2285 #endif 2286 struct rw_semaphore alloc_sem; 2287 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2288 * regions, index is order. 2289 * bb_counters[3] = 5 means 2290 * 5 free 8-block regions. */ 2291 }; 2292 2293 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 2294 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 2295 2296 #define EXT4_MB_GRP_NEED_INIT(grp) \ 2297 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 2298 2299 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 2300 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2301 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 2302 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2303 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 2304 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2305 2306 #define EXT4_MAX_CONTENTION 8 2307 #define EXT4_CONTENTION_THRESHOLD 2 2308 2309 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2310 ext4_group_t group) 2311 { 2312 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2313 } 2314 2315 /* 2316 * Returns true if the filesystem is busy enough that attempts to 2317 * access the block group locks has run into contention. 2318 */ 2319 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 2320 { 2321 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 2322 } 2323 2324 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 2325 { 2326 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 2327 if (spin_trylock(lock)) 2328 /* 2329 * We're able to grab the lock right away, so drop the 2330 * lock contention counter. 2331 */ 2332 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 2333 else { 2334 /* 2335 * The lock is busy, so bump the contention counter, 2336 * and then wait on the spin lock. 2337 */ 2338 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 2339 EXT4_MAX_CONTENTION); 2340 spin_lock(lock); 2341 } 2342 } 2343 2344 static inline void ext4_unlock_group(struct super_block *sb, 2345 ext4_group_t group) 2346 { 2347 spin_unlock(ext4_group_lock_ptr(sb, group)); 2348 } 2349 2350 /* 2351 * Block validity checking 2352 */ 2353 #define ext4_check_indirect_blockref(inode, bh) \ 2354 ext4_check_blockref(__func__, __LINE__, inode, \ 2355 (__le32 *)(bh)->b_data, \ 2356 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 2357 2358 #define ext4_ind_check_inode(inode) \ 2359 ext4_check_blockref(__func__, __LINE__, inode, \ 2360 EXT4_I(inode)->i_data, \ 2361 EXT4_NDIR_BLOCKS) 2362 2363 /* 2364 * Inodes and files operations 2365 */ 2366 2367 /* dir.c */ 2368 extern const struct file_operations ext4_dir_operations; 2369 2370 /* file.c */ 2371 extern const struct inode_operations ext4_file_inode_operations; 2372 extern const struct file_operations ext4_file_operations; 2373 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 2374 2375 /* namei.c */ 2376 extern const struct inode_operations ext4_dir_inode_operations; 2377 extern const struct inode_operations ext4_special_inode_operations; 2378 extern struct dentry *ext4_get_parent(struct dentry *child); 2379 2380 /* symlink.c */ 2381 extern const struct inode_operations ext4_symlink_inode_operations; 2382 extern const struct inode_operations ext4_fast_symlink_inode_operations; 2383 2384 /* block_validity */ 2385 extern void ext4_release_system_zone(struct super_block *sb); 2386 extern int ext4_setup_system_zone(struct super_block *sb); 2387 extern int __init ext4_init_system_zone(void); 2388 extern void ext4_exit_system_zone(void); 2389 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 2390 ext4_fsblk_t start_blk, 2391 unsigned int count); 2392 extern int ext4_check_blockref(const char *, unsigned int, 2393 struct inode *, __le32 *, unsigned int); 2394 2395 /* extents.c */ 2396 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 2397 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 2398 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, 2399 int chunk); 2400 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 2401 struct ext4_map_blocks *map, int flags); 2402 extern void ext4_ext_truncate(struct inode *); 2403 extern int ext4_ext_punch_hole(struct file *file, loff_t offset, 2404 loff_t length); 2405 extern void ext4_ext_init(struct super_block *); 2406 extern void ext4_ext_release(struct super_block *); 2407 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 2408 loff_t len); 2409 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset, 2410 ssize_t len); 2411 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 2412 struct ext4_map_blocks *map, int flags); 2413 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2414 __u64 start, __u64 len); 2415 /* move_extent.c */ 2416 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 2417 __u64 start_orig, __u64 start_donor, 2418 __u64 len, __u64 *moved_len); 2419 2420 /* page-io.c */ 2421 extern int __init ext4_init_pageio(void); 2422 extern void ext4_add_complete_io(ext4_io_end_t *io_end); 2423 extern void ext4_exit_pageio(void); 2424 extern void ext4_ioend_wait(struct inode *); 2425 extern void ext4_free_io_end(ext4_io_end_t *io); 2426 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 2427 extern void ext4_io_submit(struct ext4_io_submit *io); 2428 extern int ext4_bio_write_page(struct ext4_io_submit *io, 2429 struct page *page, 2430 int len, 2431 struct writeback_control *wbc); 2432 2433 /* mmp.c */ 2434 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 2435 extern void ext4_mmp_csum_set(struct super_block *sb, struct mmp_struct *mmp); 2436 extern int ext4_mmp_csum_verify(struct super_block *sb, 2437 struct mmp_struct *mmp); 2438 2439 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */ 2440 enum ext4_state_bits { 2441 BH_Uninit /* blocks are allocated but uninitialized on disk */ 2442 = BH_JBDPrivateStart, 2443 BH_AllocFromCluster, /* allocated blocks were part of already 2444 * allocated cluster. Note that this flag will 2445 * never, ever appear in a buffer_head's state 2446 * flag. See EXT4_MAP_FROM_CLUSTER to see where 2447 * this is used. */ 2448 BH_Da_Mapped, /* Delayed allocated block that now has a mapping. This 2449 * flag is set when ext4_map_blocks is called on a 2450 * delayed allocated block to get its real mapping. */ 2451 }; 2452 2453 BUFFER_FNS(Uninit, uninit) 2454 TAS_BUFFER_FNS(Uninit, uninit) 2455 BUFFER_FNS(Da_Mapped, da_mapped) 2456 2457 /* 2458 * Add new method to test wether block and inode bitmaps are properly 2459 * initialized. With uninit_bg reading the block from disk is not enough 2460 * to mark the bitmap uptodate. We need to also zero-out the bitmap 2461 */ 2462 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 2463 2464 static inline int bitmap_uptodate(struct buffer_head *bh) 2465 { 2466 return (buffer_uptodate(bh) && 2467 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 2468 } 2469 static inline void set_bitmap_uptodate(struct buffer_head *bh) 2470 { 2471 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 2472 } 2473 2474 /* 2475 * Disable DIO read nolock optimization, so new dioreaders will be forced 2476 * to grab i_mutex 2477 */ 2478 static inline void ext4_inode_block_unlocked_dio(struct inode *inode) 2479 { 2480 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 2481 smp_mb(); 2482 } 2483 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode) 2484 { 2485 smp_mb(); 2486 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 2487 } 2488 2489 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 2490 2491 /* For ioend & aio unwritten conversion wait queues */ 2492 #define EXT4_WQ_HASH_SZ 37 2493 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 2494 EXT4_WQ_HASH_SZ]) 2495 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\ 2496 EXT4_WQ_HASH_SZ]) 2497 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 2498 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; 2499 2500 #define EXT4_RESIZING 0 2501 extern int ext4_resize_begin(struct super_block *sb); 2502 extern void ext4_resize_end(struct super_block *sb); 2503 2504 #endif /* __KERNEL__ */ 2505 2506 #include "ext4_extents.h" 2507 2508 #endif /* _EXT4_H */ 2509