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 #define EXT4_IO_END_IN_FSYNC 0x0010 190 191 struct ext4_io_page { 192 struct page *p_page; 193 atomic_t p_count; 194 }; 195 196 #define MAX_IO_PAGES 128 197 198 /* 199 * For converting uninitialized extents on a work queue. 200 * 201 * 'page' is only used from the writepage() path; 'pages' is only used for 202 * buffered writes; they are used to keep page references until conversion 203 * takes place. For AIO/DIO, neither field is filled in. 204 */ 205 typedef struct ext4_io_end { 206 struct list_head list; /* per-file finished IO list */ 207 struct inode *inode; /* file being written to */ 208 unsigned int flag; /* unwritten or not */ 209 struct page *page; /* for writepage() path */ 210 loff_t offset; /* offset in the file */ 211 ssize_t size; /* size of the extent */ 212 struct work_struct work; /* data work queue */ 213 struct kiocb *iocb; /* iocb struct for AIO */ 214 int result; /* error value for AIO */ 215 int num_io_pages; /* for writepages() */ 216 struct ext4_io_page *pages[MAX_IO_PAGES]; /* for writepages() */ 217 } ext4_io_end_t; 218 219 struct ext4_io_submit { 220 int io_op; 221 struct bio *io_bio; 222 ext4_io_end_t *io_end; 223 struct ext4_io_page *io_page; 224 sector_t io_next_block; 225 }; 226 227 /* 228 * Special inodes numbers 229 */ 230 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 231 #define EXT4_ROOT_INO 2 /* Root inode */ 232 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 233 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 234 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 235 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 236 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 237 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 238 239 /* First non-reserved inode for old ext4 filesystems */ 240 #define EXT4_GOOD_OLD_FIRST_INO 11 241 242 /* 243 * Maximal count of links to a file 244 */ 245 #define EXT4_LINK_MAX 65000 246 247 /* 248 * Macro-instructions used to manage several block sizes 249 */ 250 #define EXT4_MIN_BLOCK_SIZE 1024 251 #define EXT4_MAX_BLOCK_SIZE 65536 252 #define EXT4_MIN_BLOCK_LOG_SIZE 10 253 #define EXT4_MAX_BLOCK_LOG_SIZE 16 254 #ifdef __KERNEL__ 255 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 256 #else 257 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 258 #endif 259 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 260 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 261 EXT4_SB(s)->s_cluster_bits) 262 #ifdef __KERNEL__ 263 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 264 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 265 #else 266 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 267 #endif 268 #ifdef __KERNEL__ 269 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 270 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 271 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 272 #else 273 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 274 EXT4_GOOD_OLD_INODE_SIZE : \ 275 (s)->s_inode_size) 276 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 277 EXT4_GOOD_OLD_FIRST_INO : \ 278 (s)->s_first_ino) 279 #endif 280 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 281 282 /* Translate a block number to a cluster number */ 283 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 284 /* Translate a cluster number to a block number */ 285 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 286 /* Translate # of blks to # of clusters */ 287 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 288 (sbi)->s_cluster_bits) 289 290 /* 291 * Structure of a blocks group descriptor 292 */ 293 struct ext4_group_desc 294 { 295 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 296 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 297 __le32 bg_inode_table_lo; /* Inodes table block */ 298 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 299 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 300 __le16 bg_used_dirs_count_lo; /* Directories count */ 301 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 302 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 303 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 304 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 305 __le16 bg_itable_unused_lo; /* Unused inodes count */ 306 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 307 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 308 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 309 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 310 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 311 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 312 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 313 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 314 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 315 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 316 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 317 __u32 bg_reserved; 318 }; 319 320 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 321 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 322 sizeof(__le16)) 323 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 324 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 325 sizeof(__le16)) 326 327 /* 328 * Structure of a flex block group info 329 */ 330 331 struct flex_groups { 332 atomic_t free_inodes; 333 atomic_t free_clusters; 334 atomic_t used_dirs; 335 }; 336 337 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 338 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 339 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 340 341 /* 342 * Macro-instructions used to manage group descriptors 343 */ 344 #define EXT4_MIN_DESC_SIZE 32 345 #define EXT4_MIN_DESC_SIZE_64BIT 64 346 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 347 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 348 #ifdef __KERNEL__ 349 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 350 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 351 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 352 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 353 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 354 #else 355 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 356 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 357 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 358 #endif 359 360 /* 361 * Constants relative to the data blocks 362 */ 363 #define EXT4_NDIR_BLOCKS 12 364 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 365 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 366 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 367 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 368 369 /* 370 * Inode flags 371 */ 372 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 373 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 374 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 375 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 376 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 377 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 378 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 379 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 380 /* Reserved for compression usage... */ 381 #define EXT4_DIRTY_FL 0x00000100 382 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 383 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 384 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 385 /* End compression flags --- maybe not all used */ 386 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 387 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 388 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 389 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 390 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 391 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 392 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 393 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 394 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 395 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 396 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 397 398 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 399 #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ 400 401 /* Flags that should be inherited by new inodes from their parent. */ 402 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 403 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 404 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 405 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 406 407 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 408 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 409 410 /* Flags that are appropriate for non-directories/regular files. */ 411 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 412 413 /* Mask out flags that are inappropriate for the given type of inode. */ 414 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 415 { 416 if (S_ISDIR(mode)) 417 return flags; 418 else if (S_ISREG(mode)) 419 return flags & EXT4_REG_FLMASK; 420 else 421 return flags & EXT4_OTHER_FLMASK; 422 } 423 424 /* 425 * Inode flags used for atomic set/get 426 */ 427 enum { 428 EXT4_INODE_SECRM = 0, /* Secure deletion */ 429 EXT4_INODE_UNRM = 1, /* Undelete */ 430 EXT4_INODE_COMPR = 2, /* Compress file */ 431 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 432 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 433 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 434 EXT4_INODE_NODUMP = 6, /* do not dump file */ 435 EXT4_INODE_NOATIME = 7, /* do not update atime */ 436 /* Reserved for compression usage... */ 437 EXT4_INODE_DIRTY = 8, 438 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 439 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 440 EXT4_INODE_ECOMPR = 11, /* Compression error */ 441 /* End compression flags --- maybe not all used */ 442 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 443 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 444 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 445 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 446 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 447 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 448 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 449 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 450 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 451 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 452 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 453 }; 454 455 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 456 #define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \ 457 printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \ 458 EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); } 459 460 /* 461 * Since it's pretty easy to mix up bit numbers and hex values, and we 462 * can't do a compile-time test for ENUM values, we use a run-time 463 * test to make sure that EXT4_XXX_FL is consistent with respect to 464 * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop 465 * out so it won't cost any extra space in the compiled kernel image. 466 * But it's important that these values are the same, since we are 467 * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL 468 * must be consistent with the values of FS_XXX_FL defined in 469 * include/linux/fs.h and the on-disk values found in ext2, ext3, and 470 * ext4 filesystems, and of course the values defined in e2fsprogs. 471 * 472 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 473 */ 474 static inline void ext4_check_flag_values(void) 475 { 476 CHECK_FLAG_VALUE(SECRM); 477 CHECK_FLAG_VALUE(UNRM); 478 CHECK_FLAG_VALUE(COMPR); 479 CHECK_FLAG_VALUE(SYNC); 480 CHECK_FLAG_VALUE(IMMUTABLE); 481 CHECK_FLAG_VALUE(APPEND); 482 CHECK_FLAG_VALUE(NODUMP); 483 CHECK_FLAG_VALUE(NOATIME); 484 CHECK_FLAG_VALUE(DIRTY); 485 CHECK_FLAG_VALUE(COMPRBLK); 486 CHECK_FLAG_VALUE(NOCOMPR); 487 CHECK_FLAG_VALUE(ECOMPR); 488 CHECK_FLAG_VALUE(INDEX); 489 CHECK_FLAG_VALUE(IMAGIC); 490 CHECK_FLAG_VALUE(JOURNAL_DATA); 491 CHECK_FLAG_VALUE(NOTAIL); 492 CHECK_FLAG_VALUE(DIRSYNC); 493 CHECK_FLAG_VALUE(TOPDIR); 494 CHECK_FLAG_VALUE(HUGE_FILE); 495 CHECK_FLAG_VALUE(EXTENTS); 496 CHECK_FLAG_VALUE(EA_INODE); 497 CHECK_FLAG_VALUE(EOFBLOCKS); 498 CHECK_FLAG_VALUE(RESERVED); 499 } 500 501 /* Used to pass group descriptor data when online resize is done */ 502 struct ext4_new_group_input { 503 __u32 group; /* Group number for this data */ 504 __u64 block_bitmap; /* Absolute block number of block bitmap */ 505 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 506 __u64 inode_table; /* Absolute block number of inode table start */ 507 __u32 blocks_count; /* Total number of blocks in this group */ 508 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 509 __u16 unused; 510 }; 511 512 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 513 struct compat_ext4_new_group_input { 514 u32 group; 515 compat_u64 block_bitmap; 516 compat_u64 inode_bitmap; 517 compat_u64 inode_table; 518 u32 blocks_count; 519 u16 reserved_blocks; 520 u16 unused; 521 }; 522 #endif 523 524 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 525 struct ext4_new_group_data { 526 __u32 group; 527 __u64 block_bitmap; 528 __u64 inode_bitmap; 529 __u64 inode_table; 530 __u32 blocks_count; 531 __u16 reserved_blocks; 532 __u16 unused; 533 __u32 free_blocks_count; 534 }; 535 536 /* Indexes used to index group tables in ext4_new_group_data */ 537 enum { 538 BLOCK_BITMAP = 0, /* block bitmap */ 539 INODE_BITMAP, /* inode bitmap */ 540 INODE_TABLE, /* inode tables */ 541 GROUP_TABLE_COUNT, 542 }; 543 544 /* 545 * Flags used by ext4_map_blocks() 546 */ 547 /* Allocate any needed blocks and/or convert an unitialized 548 extent to be an initialized ext4 */ 549 #define EXT4_GET_BLOCKS_CREATE 0x0001 550 /* Request the creation of an unitialized extent */ 551 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 552 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ 553 EXT4_GET_BLOCKS_CREATE) 554 /* Caller is from the delayed allocation writeout path, 555 so set the magic i_delalloc_reserve_flag after taking the 556 inode allocation semaphore for */ 557 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 558 /* caller is from the direct IO path, request to creation of an 559 unitialized extents if not allocated, split the uninitialized 560 extent if blocks has been preallocated already*/ 561 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 562 #define EXT4_GET_BLOCKS_CONVERT 0x0010 563 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 564 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 565 /* Convert extent to initialized after IO complete */ 566 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 567 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 568 /* Punch out blocks of an extent */ 569 #define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020 570 /* Don't normalize allocation size (used for fallocate) */ 571 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 572 /* Request will not result in inode size update (user for fallocate) */ 573 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 574 /* Do not take i_data_sem locking in ext4_map_blocks */ 575 #define EXT4_GET_BLOCKS_NO_LOCK 0x0100 576 577 /* 578 * Flags used by ext4_free_blocks 579 */ 580 #define EXT4_FREE_BLOCKS_METADATA 0x0001 581 #define EXT4_FREE_BLOCKS_FORGET 0x0002 582 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 583 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 584 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 585 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 586 587 /* 588 * Flags used by ext4_discard_partial_page_buffers 589 */ 590 #define EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED 0x0001 591 592 /* 593 * ioctl commands 594 */ 595 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 596 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 597 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 598 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 599 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 600 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 601 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 602 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 603 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 604 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 605 #define EXT4_IOC_MIGRATE _IO('f', 9) 606 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 607 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 608 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 609 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 610 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 611 612 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 613 /* 614 * ioctl commands in 32 bit emulation 615 */ 616 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 617 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 618 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 619 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 620 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 621 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 622 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 623 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 624 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 625 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 626 #endif 627 628 /* Max physical block we can address w/o extents */ 629 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 630 631 /* 632 * Structure of an inode on the disk 633 */ 634 struct ext4_inode { 635 __le16 i_mode; /* File mode */ 636 __le16 i_uid; /* Low 16 bits of Owner Uid */ 637 __le32 i_size_lo; /* Size in bytes */ 638 __le32 i_atime; /* Access time */ 639 __le32 i_ctime; /* Inode Change time */ 640 __le32 i_mtime; /* Modification time */ 641 __le32 i_dtime; /* Deletion Time */ 642 __le16 i_gid; /* Low 16 bits of Group Id */ 643 __le16 i_links_count; /* Links count */ 644 __le32 i_blocks_lo; /* Blocks count */ 645 __le32 i_flags; /* File flags */ 646 union { 647 struct { 648 __le32 l_i_version; 649 } linux1; 650 struct { 651 __u32 h_i_translator; 652 } hurd1; 653 struct { 654 __u32 m_i_reserved1; 655 } masix1; 656 } osd1; /* OS dependent 1 */ 657 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 658 __le32 i_generation; /* File version (for NFS) */ 659 __le32 i_file_acl_lo; /* File ACL */ 660 __le32 i_size_high; 661 __le32 i_obso_faddr; /* Obsoleted fragment address */ 662 union { 663 struct { 664 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 665 __le16 l_i_file_acl_high; 666 __le16 l_i_uid_high; /* these 2 fields */ 667 __le16 l_i_gid_high; /* were reserved2[0] */ 668 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 669 __le16 l_i_reserved; 670 } linux2; 671 struct { 672 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 673 __u16 h_i_mode_high; 674 __u16 h_i_uid_high; 675 __u16 h_i_gid_high; 676 __u32 h_i_author; 677 } hurd2; 678 struct { 679 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 680 __le16 m_i_file_acl_high; 681 __u32 m_i_reserved2[2]; 682 } masix2; 683 } osd2; /* OS dependent 2 */ 684 __le16 i_extra_isize; 685 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 686 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 687 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 688 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 689 __le32 i_crtime; /* File Creation time */ 690 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 691 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 692 }; 693 694 struct move_extent { 695 __u32 reserved; /* should be zero */ 696 __u32 donor_fd; /* donor file descriptor */ 697 __u64 orig_start; /* logical start offset in block for orig */ 698 __u64 donor_start; /* logical start offset in block for donor */ 699 __u64 len; /* block length to be moved */ 700 __u64 moved_len; /* moved block length */ 701 }; 702 703 #define EXT4_EPOCH_BITS 2 704 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 705 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 706 707 /* 708 * Extended fields will fit into an inode if the filesystem was formatted 709 * with large inodes (-I 256 or larger) and there are not currently any EAs 710 * consuming all of the available space. For new inodes we always reserve 711 * enough space for the kernel's known extended fields, but for inodes 712 * created with an old kernel this might not have been the case. None of 713 * the extended inode fields is critical for correct filesystem operation. 714 * This macro checks if a certain field fits in the inode. Note that 715 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 716 */ 717 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 718 ((offsetof(typeof(*ext4_inode), field) + \ 719 sizeof((ext4_inode)->field)) \ 720 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 721 (einode)->i_extra_isize)) \ 722 723 static inline __le32 ext4_encode_extra_time(struct timespec *time) 724 { 725 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 726 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | 727 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); 728 } 729 730 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 731 { 732 if (sizeof(time->tv_sec) > 4) 733 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 734 << 32; 735 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 736 } 737 738 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 739 do { \ 740 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 741 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 742 (raw_inode)->xtime ## _extra = \ 743 ext4_encode_extra_time(&(inode)->xtime); \ 744 } while (0) 745 746 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 747 do { \ 748 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 749 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 750 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 751 (raw_inode)->xtime ## _extra = \ 752 ext4_encode_extra_time(&(einode)->xtime); \ 753 } while (0) 754 755 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 756 do { \ 757 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 758 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 759 ext4_decode_extra_time(&(inode)->xtime, \ 760 raw_inode->xtime ## _extra); \ 761 else \ 762 (inode)->xtime.tv_nsec = 0; \ 763 } while (0) 764 765 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 766 do { \ 767 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 768 (einode)->xtime.tv_sec = \ 769 (signed)le32_to_cpu((raw_inode)->xtime); \ 770 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 771 ext4_decode_extra_time(&(einode)->xtime, \ 772 raw_inode->xtime ## _extra); \ 773 else \ 774 (einode)->xtime.tv_nsec = 0; \ 775 } while (0) 776 777 #define i_disk_version osd1.linux1.l_i_version 778 779 #if defined(__KERNEL__) || defined(__linux__) 780 #define i_reserved1 osd1.linux1.l_i_reserved1 781 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 782 #define i_blocks_high osd2.linux2.l_i_blocks_high 783 #define i_uid_low i_uid 784 #define i_gid_low i_gid 785 #define i_uid_high osd2.linux2.l_i_uid_high 786 #define i_gid_high osd2.linux2.l_i_gid_high 787 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 788 789 #elif defined(__GNU__) 790 791 #define i_translator osd1.hurd1.h_i_translator 792 #define i_uid_high osd2.hurd2.h_i_uid_high 793 #define i_gid_high osd2.hurd2.h_i_gid_high 794 #define i_author osd2.hurd2.h_i_author 795 796 #elif defined(__masix__) 797 798 #define i_reserved1 osd1.masix1.m_i_reserved1 799 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 800 #define i_reserved2 osd2.masix2.m_i_reserved2 801 802 #endif /* defined(__KERNEL__) || defined(__linux__) */ 803 804 /* 805 * storage for cached extent 806 * If ec_len == 0, then the cache is invalid. 807 * If ec_start == 0, then the cache represents a gap (null mapping) 808 */ 809 struct ext4_ext_cache { 810 ext4_fsblk_t ec_start; 811 ext4_lblk_t ec_block; 812 __u32 ec_len; /* must be 32bit to return holes */ 813 }; 814 815 /* 816 * fourth extended file system inode data in memory 817 */ 818 struct ext4_inode_info { 819 __le32 i_data[15]; /* unconverted */ 820 __u32 i_dtime; 821 ext4_fsblk_t i_file_acl; 822 823 /* 824 * i_block_group is the number of the block group which contains 825 * this file's inode. Constant across the lifetime of the inode, 826 * it is ued for making block allocation decisions - we try to 827 * place a file's data blocks near its inode block, and new inodes 828 * near to their parent directory's inode. 829 */ 830 ext4_group_t i_block_group; 831 ext4_lblk_t i_dir_start_lookup; 832 #if (BITS_PER_LONG < 64) 833 unsigned long i_state_flags; /* Dynamic state flags */ 834 #endif 835 unsigned long i_flags; 836 837 #ifdef CONFIG_EXT4_FS_XATTR 838 /* 839 * Extended attributes can be read independently of the main file 840 * data. Taking i_mutex even when reading would cause contention 841 * between readers of EAs and writers of regular file data, so 842 * instead we synchronize on xattr_sem when reading or changing 843 * EAs. 844 */ 845 struct rw_semaphore xattr_sem; 846 #endif 847 848 struct list_head i_orphan; /* unlinked but open inodes */ 849 850 /* 851 * i_disksize keeps track of what the inode size is ON DISK, not 852 * in memory. During truncate, i_size is set to the new size by 853 * the VFS prior to calling ext4_truncate(), but the filesystem won't 854 * set i_disksize to 0 until the truncate is actually under way. 855 * 856 * The intent is that i_disksize always represents the blocks which 857 * are used by this file. This allows recovery to restart truncate 858 * on orphans if we crash during truncate. We actually write i_disksize 859 * into the on-disk inode when writing inodes out, instead of i_size. 860 * 861 * The only time when i_disksize and i_size may be different is when 862 * a truncate is in progress. The only things which change i_disksize 863 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 864 */ 865 loff_t i_disksize; 866 867 /* 868 * i_data_sem is for serialising ext4_truncate() against 869 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 870 * data tree are chopped off during truncate. We can't do that in 871 * ext4 because whenever we perform intermediate commits during 872 * truncate, the inode and all the metadata blocks *must* be in a 873 * consistent state which allows truncation of the orphans to restart 874 * during recovery. Hence we must fix the get_block-vs-truncate race 875 * by other means, so we have i_data_sem. 876 */ 877 struct rw_semaphore i_data_sem; 878 struct inode vfs_inode; 879 struct jbd2_inode *jinode; 880 881 struct ext4_ext_cache i_cached_extent; 882 /* 883 * File creation time. Its function is same as that of 884 * struct timespec i_{a,c,m}time in the generic inode. 885 */ 886 struct timespec i_crtime; 887 888 /* mballoc */ 889 struct list_head i_prealloc_list; 890 spinlock_t i_prealloc_lock; 891 892 /* ialloc */ 893 ext4_group_t i_last_alloc_group; 894 895 /* allocation reservation info for delalloc */ 896 /* In case of bigalloc, these refer to clusters rather than blocks */ 897 unsigned int i_reserved_data_blocks; 898 unsigned int i_reserved_meta_blocks; 899 unsigned int i_allocated_meta_blocks; 900 ext4_lblk_t i_da_metadata_calc_last_lblock; 901 int i_da_metadata_calc_len; 902 903 /* on-disk additional length */ 904 __u16 i_extra_isize; 905 906 #ifdef CONFIG_QUOTA 907 /* quota space reservation, managed internally by quota code */ 908 qsize_t i_reserved_quota; 909 #endif 910 911 /* completed IOs that might need unwritten extents handling */ 912 struct list_head i_completed_io_list; 913 spinlock_t i_completed_io_lock; 914 atomic_t i_ioend_count; /* Number of outstanding io_end structs */ 915 /* current io_end structure for async DIO write*/ 916 ext4_io_end_t *cur_aio_dio; 917 atomic_t i_aiodio_unwritten; /* Nr. of inflight conversions pending */ 918 919 spinlock_t i_block_reservation_lock; 920 921 /* 922 * Transactions that contain inode's metadata needed to complete 923 * fsync and fdatasync, respectively. 924 */ 925 tid_t i_sync_tid; 926 tid_t i_datasync_tid; 927 928 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 929 __u32 i_csum_seed; 930 }; 931 932 /* 933 * File system states 934 */ 935 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 936 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 937 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 938 939 /* 940 * Misc. filesystem flags 941 */ 942 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 943 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 944 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 945 946 /* 947 * Mount flags 948 */ 949 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 950 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 951 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 952 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 953 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 954 #define EXT4_MOUNT_ERRORS_MASK 0x00070 955 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 956 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 957 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 958 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 959 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 960 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 961 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 962 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 963 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 964 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 965 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 966 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 967 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 968 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 969 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 970 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 971 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 972 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 973 #define EXT4_MOUNT_MBLK_IO_SUBMIT 0x4000000 /* multi-block io submits */ 974 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 975 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 976 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 977 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 978 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 979 980 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 981 specified delalloc */ 982 983 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 984 ~EXT4_MOUNT_##opt 985 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 986 EXT4_MOUNT_##opt 987 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 988 EXT4_MOUNT_##opt) 989 990 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 991 ~EXT4_MOUNT2_##opt 992 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 993 EXT4_MOUNT2_##opt 994 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 995 EXT4_MOUNT2_##opt) 996 997 #define ext4_test_and_set_bit __test_and_set_bit_le 998 #define ext4_set_bit __set_bit_le 999 #define ext4_set_bit_atomic ext2_set_bit_atomic 1000 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1001 #define ext4_clear_bit __clear_bit_le 1002 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1003 #define ext4_test_bit test_bit_le 1004 #define ext4_find_next_zero_bit find_next_zero_bit_le 1005 #define ext4_find_next_bit find_next_bit_le 1006 1007 extern void ext4_set_bits(void *bm, int cur, int len); 1008 1009 /* 1010 * Maximal mount counts between two filesystem checks 1011 */ 1012 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1013 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1014 1015 /* 1016 * Behaviour when detecting errors 1017 */ 1018 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1019 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1020 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1021 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1022 1023 /* Metadata checksum algorithm codes */ 1024 #define EXT4_CRC32C_CHKSUM 1 1025 1026 /* 1027 * Structure of the super block 1028 */ 1029 struct ext4_super_block { 1030 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1031 __le32 s_blocks_count_lo; /* Blocks count */ 1032 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1033 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1034 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1035 __le32 s_first_data_block; /* First Data Block */ 1036 __le32 s_log_block_size; /* Block size */ 1037 __le32 s_log_cluster_size; /* Allocation cluster size */ 1038 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1039 __le32 s_clusters_per_group; /* # Clusters per group */ 1040 __le32 s_inodes_per_group; /* # Inodes per group */ 1041 __le32 s_mtime; /* Mount time */ 1042 /*30*/ __le32 s_wtime; /* Write time */ 1043 __le16 s_mnt_count; /* Mount count */ 1044 __le16 s_max_mnt_count; /* Maximal mount count */ 1045 __le16 s_magic; /* Magic signature */ 1046 __le16 s_state; /* File system state */ 1047 __le16 s_errors; /* Behaviour when detecting errors */ 1048 __le16 s_minor_rev_level; /* minor revision level */ 1049 /*40*/ __le32 s_lastcheck; /* time of last check */ 1050 __le32 s_checkinterval; /* max. time between checks */ 1051 __le32 s_creator_os; /* OS */ 1052 __le32 s_rev_level; /* Revision level */ 1053 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1054 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1055 /* 1056 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1057 * 1058 * Note: the difference between the compatible feature set and 1059 * the incompatible feature set is that if there is a bit set 1060 * in the incompatible feature set that the kernel doesn't 1061 * know about, it should refuse to mount the filesystem. 1062 * 1063 * e2fsck's requirements are more strict; if it doesn't know 1064 * about a feature in either the compatible or incompatible 1065 * feature set, it must abort and not try to meddle with 1066 * things it doesn't understand... 1067 */ 1068 __le32 s_first_ino; /* First non-reserved inode */ 1069 __le16 s_inode_size; /* size of inode structure */ 1070 __le16 s_block_group_nr; /* block group # of this superblock */ 1071 __le32 s_feature_compat; /* compatible feature set */ 1072 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1073 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1074 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1075 /*78*/ char s_volume_name[16]; /* volume name */ 1076 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 1077 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1078 /* 1079 * Performance hints. Directory preallocation should only 1080 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1081 */ 1082 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1083 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1084 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1085 /* 1086 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1087 */ 1088 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1089 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1090 __le32 s_journal_dev; /* device number of journal file */ 1091 __le32 s_last_orphan; /* start of list of inodes to delete */ 1092 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1093 __u8 s_def_hash_version; /* Default hash version to use */ 1094 __u8 s_jnl_backup_type; 1095 __le16 s_desc_size; /* size of group descriptor */ 1096 /*100*/ __le32 s_default_mount_opts; 1097 __le32 s_first_meta_bg; /* First metablock block group */ 1098 __le32 s_mkfs_time; /* When the filesystem was created */ 1099 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1100 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1101 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1102 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1103 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1104 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1105 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1106 __le32 s_flags; /* Miscellaneous flags */ 1107 __le16 s_raid_stride; /* RAID stride */ 1108 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1109 __le64 s_mmp_block; /* Block for multi-mount protection */ 1110 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1111 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1112 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1113 __le16 s_reserved_pad; 1114 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1115 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1116 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1117 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1118 snapshot's future use */ 1119 __le32 s_snapshot_list; /* inode number of the head of the 1120 on-disk snapshot list */ 1121 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1122 __le32 s_error_count; /* number of fs errors */ 1123 __le32 s_first_error_time; /* first time an error happened */ 1124 __le32 s_first_error_ino; /* inode involved in first error */ 1125 __le64 s_first_error_block; /* block involved of first error */ 1126 __u8 s_first_error_func[32]; /* function where the error happened */ 1127 __le32 s_first_error_line; /* line number where error happened */ 1128 __le32 s_last_error_time; /* most recent time of an error */ 1129 __le32 s_last_error_ino; /* inode involved in last error */ 1130 __le32 s_last_error_line; /* line number where error happened */ 1131 __le64 s_last_error_block; /* block involved of last error */ 1132 __u8 s_last_error_func[32]; /* function where the error happened */ 1133 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1134 __u8 s_mount_opts[64]; 1135 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1136 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1137 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1138 __le32 s_reserved[108]; /* Padding to the end of the block */ 1139 __le32 s_checksum; /* crc32c(superblock) */ 1140 }; 1141 1142 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1143 1144 #ifdef __KERNEL__ 1145 1146 /* 1147 * run-time mount flags 1148 */ 1149 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1150 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1151 1152 /* 1153 * fourth extended-fs super-block data in memory 1154 */ 1155 struct ext4_sb_info { 1156 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1157 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1158 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1159 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1160 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1161 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1162 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1163 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1164 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1165 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1166 unsigned long s_overhead; /* # of fs overhead clusters */ 1167 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1168 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1169 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1170 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1171 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1172 struct buffer_head **s_group_desc; 1173 unsigned int s_mount_opt; 1174 unsigned int s_mount_opt2; 1175 unsigned int s_mount_flags; 1176 unsigned int s_def_mount_opt; 1177 ext4_fsblk_t s_sb_block; 1178 kuid_t s_resuid; 1179 kgid_t s_resgid; 1180 unsigned short s_mount_state; 1181 unsigned short s_pad; 1182 int s_addr_per_block_bits; 1183 int s_desc_per_block_bits; 1184 int s_inode_size; 1185 int s_first_ino; 1186 unsigned int s_inode_readahead_blks; 1187 unsigned int s_inode_goal; 1188 spinlock_t s_next_gen_lock; 1189 u32 s_next_generation; 1190 u32 s_hash_seed[4]; 1191 int s_def_hash_version; 1192 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1193 struct percpu_counter s_freeclusters_counter; 1194 struct percpu_counter s_freeinodes_counter; 1195 struct percpu_counter s_dirs_counter; 1196 struct percpu_counter s_dirtyclusters_counter; 1197 struct blockgroup_lock *s_blockgroup_lock; 1198 struct proc_dir_entry *s_proc; 1199 struct kobject s_kobj; 1200 struct completion s_kobj_unregister; 1201 struct super_block *s_sb; 1202 1203 /* Journaling */ 1204 struct journal_s *s_journal; 1205 struct list_head s_orphan; 1206 struct mutex s_orphan_lock; 1207 unsigned long s_resize_flags; /* Flags indicating if there 1208 is a resizer */ 1209 unsigned long s_commit_interval; 1210 u32 s_max_batch_time; 1211 u32 s_min_batch_time; 1212 struct block_device *journal_bdev; 1213 #ifdef CONFIG_QUOTA 1214 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ 1215 int s_jquota_fmt; /* Format of quota to use */ 1216 #endif 1217 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1218 struct rb_root system_blks; 1219 1220 #ifdef EXTENTS_STATS 1221 /* ext4 extents stats */ 1222 unsigned long s_ext_min; 1223 unsigned long s_ext_max; 1224 unsigned long s_depth_max; 1225 spinlock_t s_ext_stats_lock; 1226 unsigned long s_ext_blocks; 1227 unsigned long s_ext_extents; 1228 #endif 1229 1230 /* for buddy allocator */ 1231 struct ext4_group_info ***s_group_info; 1232 struct inode *s_buddy_cache; 1233 spinlock_t s_md_lock; 1234 unsigned short *s_mb_offsets; 1235 unsigned int *s_mb_maxs; 1236 1237 /* tunables */ 1238 unsigned long s_stripe; 1239 unsigned int s_mb_stream_request; 1240 unsigned int s_mb_max_to_scan; 1241 unsigned int s_mb_min_to_scan; 1242 unsigned int s_mb_stats; 1243 unsigned int s_mb_order2_reqs; 1244 unsigned int s_mb_group_prealloc; 1245 unsigned int s_max_writeback_mb_bump; 1246 /* where last allocation was done - for stream allocation */ 1247 unsigned long s_mb_last_group; 1248 unsigned long s_mb_last_start; 1249 1250 /* stats for buddy allocator */ 1251 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1252 atomic_t s_bal_success; /* we found long enough chunks */ 1253 atomic_t s_bal_allocated; /* in blocks */ 1254 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1255 atomic_t s_bal_goals; /* goal hits */ 1256 atomic_t s_bal_breaks; /* too long searches */ 1257 atomic_t s_bal_2orders; /* 2^order hits */ 1258 spinlock_t s_bal_lock; 1259 unsigned long s_mb_buddies_generated; 1260 unsigned long long s_mb_generation_time; 1261 atomic_t s_mb_lost_chunks; 1262 atomic_t s_mb_preallocated; 1263 atomic_t s_mb_discarded; 1264 atomic_t s_lock_busy; 1265 1266 /* locality groups */ 1267 struct ext4_locality_group __percpu *s_locality_groups; 1268 1269 /* for write statistics */ 1270 unsigned long s_sectors_written_start; 1271 u64 s_kbytes_written; 1272 1273 unsigned int s_log_groups_per_flex; 1274 struct flex_groups *s_flex_groups; 1275 1276 /* workqueue for dio unwritten */ 1277 struct workqueue_struct *dio_unwritten_wq; 1278 1279 /* timer for periodic error stats printing */ 1280 struct timer_list s_err_report; 1281 1282 /* Lazy inode table initialization info */ 1283 struct ext4_li_request *s_li_request; 1284 /* Wait multiplier for lazy initialization thread */ 1285 unsigned int s_li_wait_mult; 1286 1287 /* Kernel thread for multiple mount protection */ 1288 struct task_struct *s_mmp_tsk; 1289 1290 /* record the last minlen when FITRIM is called. */ 1291 atomic_t s_last_trim_minblks; 1292 1293 /* Reference to checksum algorithm driver via cryptoapi */ 1294 struct crypto_shash *s_chksum_driver; 1295 1296 /* Precomputed FS UUID checksum for seeding other checksums */ 1297 __u32 s_csum_seed; 1298 }; 1299 1300 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1301 { 1302 return sb->s_fs_info; 1303 } 1304 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1305 { 1306 return container_of(inode, struct ext4_inode_info, vfs_inode); 1307 } 1308 1309 static inline struct timespec ext4_current_time(struct inode *inode) 1310 { 1311 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1312 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1313 } 1314 1315 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1316 { 1317 return ino == EXT4_ROOT_INO || 1318 ino == EXT4_USR_QUOTA_INO || 1319 ino == EXT4_GRP_QUOTA_INO || 1320 ino == EXT4_JOURNAL_INO || 1321 ino == EXT4_RESIZE_INO || 1322 (ino >= EXT4_FIRST_INO(sb) && 1323 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1324 } 1325 1326 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 1327 struct ext4_io_end *io_end) 1328 { 1329 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 1330 io_end->flag |= EXT4_IO_END_UNWRITTEN; 1331 atomic_inc(&EXT4_I(inode)->i_aiodio_unwritten); 1332 } 1333 } 1334 1335 /* 1336 * Inode dynamic state flags 1337 */ 1338 enum { 1339 EXT4_STATE_JDATA, /* journaled data exists */ 1340 EXT4_STATE_NEW, /* inode is newly created */ 1341 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1342 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1343 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1344 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1345 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1346 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1347 EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */ 1348 }; 1349 1350 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1351 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1352 { \ 1353 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1354 } \ 1355 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1356 { \ 1357 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1358 } \ 1359 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1360 { \ 1361 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1362 } 1363 1364 EXT4_INODE_BIT_FNS(flag, flags, 0) 1365 #if (BITS_PER_LONG < 64) 1366 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1367 1368 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1369 { 1370 (ei)->i_state_flags = 0; 1371 } 1372 #else 1373 EXT4_INODE_BIT_FNS(state, flags, 32) 1374 1375 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1376 { 1377 /* We depend on the fact that callers will set i_flags */ 1378 } 1379 #endif 1380 #else 1381 /* Assume that user mode programs are passing in an ext4fs superblock, not 1382 * a kernel struct super_block. This will allow us to call the feature-test 1383 * macros from user land. */ 1384 #define EXT4_SB(sb) (sb) 1385 #endif 1386 1387 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1388 1389 /* 1390 * Codes for operating systems 1391 */ 1392 #define EXT4_OS_LINUX 0 1393 #define EXT4_OS_HURD 1 1394 #define EXT4_OS_MASIX 2 1395 #define EXT4_OS_FREEBSD 3 1396 #define EXT4_OS_LITES 4 1397 1398 /* 1399 * Revision levels 1400 */ 1401 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1402 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1403 1404 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1405 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1406 1407 #define EXT4_GOOD_OLD_INODE_SIZE 128 1408 1409 /* 1410 * Feature set definitions 1411 */ 1412 1413 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1414 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1415 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1416 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1417 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1418 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1419 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1420 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1421 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1422 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1423 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1424 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1425 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1426 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1427 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1428 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1429 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1430 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1431 1432 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1433 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1434 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1435 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1436 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1437 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1438 1439 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1440 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1441 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1442 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1443 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1444 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1445 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1446 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1447 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1448 /* 1449 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1450 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1451 * all other data structures' checksums. However, the METADATA_CSUM and 1452 * GDT_CSUM bits are mutually exclusive. 1453 */ 1454 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1455 1456 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1457 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1458 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1459 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1460 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1461 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1462 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1463 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1464 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1465 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1466 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1467 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */ 1468 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1469 #define EXT4_FEATURE_INCOMPAT_INLINEDATA 0x8000 /* data in inode */ 1470 1471 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1472 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1473 EXT4_FEATURE_INCOMPAT_META_BG) 1474 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1475 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1476 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1477 1478 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1479 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1480 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1481 EXT4_FEATURE_INCOMPAT_META_BG) 1482 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1483 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1484 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1485 1486 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 1487 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1488 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1489 EXT4_FEATURE_INCOMPAT_META_BG| \ 1490 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1491 EXT4_FEATURE_INCOMPAT_64BIT| \ 1492 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1493 EXT4_FEATURE_INCOMPAT_MMP) 1494 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1495 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1496 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1497 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1498 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1499 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1500 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1501 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1502 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1503 EXT4_FEATURE_RO_COMPAT_QUOTA) 1504 1505 /* 1506 * Default values for user and/or group using reserved blocks 1507 */ 1508 #define EXT4_DEF_RESUID 0 1509 #define EXT4_DEF_RESGID 0 1510 1511 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1512 1513 /* 1514 * Default mount options 1515 */ 1516 #define EXT4_DEFM_DEBUG 0x0001 1517 #define EXT4_DEFM_BSDGROUPS 0x0002 1518 #define EXT4_DEFM_XATTR_USER 0x0004 1519 #define EXT4_DEFM_ACL 0x0008 1520 #define EXT4_DEFM_UID16 0x0010 1521 #define EXT4_DEFM_JMODE 0x0060 1522 #define EXT4_DEFM_JMODE_DATA 0x0020 1523 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1524 #define EXT4_DEFM_JMODE_WBACK 0x0060 1525 #define EXT4_DEFM_NOBARRIER 0x0100 1526 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1527 #define EXT4_DEFM_DISCARD 0x0400 1528 #define EXT4_DEFM_NODELALLOC 0x0800 1529 1530 /* 1531 * Default journal batch times 1532 */ 1533 #define EXT4_DEF_MIN_BATCH_TIME 0 1534 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1535 1536 /* 1537 * Minimum number of groups in a flexgroup before we separate out 1538 * directories into the first block group of a flexgroup 1539 */ 1540 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1541 1542 /* 1543 * Structure of a directory entry 1544 */ 1545 #define EXT4_NAME_LEN 255 1546 1547 struct ext4_dir_entry { 1548 __le32 inode; /* Inode number */ 1549 __le16 rec_len; /* Directory entry length */ 1550 __le16 name_len; /* Name length */ 1551 char name[EXT4_NAME_LEN]; /* File name */ 1552 }; 1553 1554 /* 1555 * The new version of the directory entry. Since EXT4 structures are 1556 * stored in intel byte order, and the name_len field could never be 1557 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1558 * file_type field. 1559 */ 1560 struct ext4_dir_entry_2 { 1561 __le32 inode; /* Inode number */ 1562 __le16 rec_len; /* Directory entry length */ 1563 __u8 name_len; /* Name length */ 1564 __u8 file_type; 1565 char name[EXT4_NAME_LEN]; /* File name */ 1566 }; 1567 1568 /* 1569 * This is a bogus directory entry at the end of each leaf block that 1570 * records checksums. 1571 */ 1572 struct ext4_dir_entry_tail { 1573 __le32 det_reserved_zero1; /* Pretend to be unused */ 1574 __le16 det_rec_len; /* 12 */ 1575 __u8 det_reserved_zero2; /* Zero name length */ 1576 __u8 det_reserved_ft; /* 0xDE, fake file type */ 1577 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1578 }; 1579 1580 /* 1581 * Ext4 directory file types. Only the low 3 bits are used. The 1582 * other bits are reserved for now. 1583 */ 1584 #define EXT4_FT_UNKNOWN 0 1585 #define EXT4_FT_REG_FILE 1 1586 #define EXT4_FT_DIR 2 1587 #define EXT4_FT_CHRDEV 3 1588 #define EXT4_FT_BLKDEV 4 1589 #define EXT4_FT_FIFO 5 1590 #define EXT4_FT_SOCK 6 1591 #define EXT4_FT_SYMLINK 7 1592 1593 #define EXT4_FT_MAX 8 1594 1595 #define EXT4_FT_DIR_CSUM 0xDE 1596 1597 /* 1598 * EXT4_DIR_PAD defines the directory entries boundaries 1599 * 1600 * NOTE: It must be a multiple of 4 1601 */ 1602 #define EXT4_DIR_PAD 4 1603 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1604 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1605 ~EXT4_DIR_ROUND) 1606 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1607 1608 /* 1609 * If we ever get support for fs block sizes > page_size, we'll need 1610 * to remove the #if statements in the next two functions... 1611 */ 1612 static inline unsigned int 1613 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1614 { 1615 unsigned len = le16_to_cpu(dlen); 1616 1617 #if (PAGE_CACHE_SIZE >= 65536) 1618 if (len == EXT4_MAX_REC_LEN || len == 0) 1619 return blocksize; 1620 return (len & 65532) | ((len & 3) << 16); 1621 #else 1622 return len; 1623 #endif 1624 } 1625 1626 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1627 { 1628 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1629 BUG(); 1630 #if (PAGE_CACHE_SIZE >= 65536) 1631 if (len < 65536) 1632 return cpu_to_le16(len); 1633 if (len == blocksize) { 1634 if (blocksize == 65536) 1635 return cpu_to_le16(EXT4_MAX_REC_LEN); 1636 else 1637 return cpu_to_le16(0); 1638 } 1639 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 1640 #else 1641 return cpu_to_le16(len); 1642 #endif 1643 } 1644 1645 /* 1646 * Hash Tree Directory indexing 1647 * (c) Daniel Phillips, 2001 1648 */ 1649 1650 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 1651 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 1652 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 1653 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 1654 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 1655 1656 /* Legal values for the dx_root hash_version field: */ 1657 1658 #define DX_HASH_LEGACY 0 1659 #define DX_HASH_HALF_MD4 1 1660 #define DX_HASH_TEA 2 1661 #define DX_HASH_LEGACY_UNSIGNED 3 1662 #define DX_HASH_HALF_MD4_UNSIGNED 4 1663 #define DX_HASH_TEA_UNSIGNED 5 1664 1665 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 1666 const void *address, unsigned int length) 1667 { 1668 struct { 1669 struct shash_desc shash; 1670 char ctx[4]; 1671 } desc; 1672 int err; 1673 1674 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 1675 1676 desc.shash.tfm = sbi->s_chksum_driver; 1677 desc.shash.flags = 0; 1678 *(u32 *)desc.ctx = crc; 1679 1680 err = crypto_shash_update(&desc.shash, address, length); 1681 BUG_ON(err); 1682 1683 return *(u32 *)desc.ctx; 1684 } 1685 1686 #ifdef __KERNEL__ 1687 1688 /* hash info structure used by the directory hash */ 1689 struct dx_hash_info 1690 { 1691 u32 hash; 1692 u32 minor_hash; 1693 int hash_version; 1694 u32 *seed; 1695 }; 1696 1697 1698 /* 32 and 64 bit signed EOF for dx directories */ 1699 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 1700 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 1701 1702 1703 /* 1704 * Control parameters used by ext4_htree_next_block 1705 */ 1706 #define HASH_NB_ALWAYS 1 1707 1708 1709 /* 1710 * Describe an inode's exact location on disk and in memory 1711 */ 1712 struct ext4_iloc 1713 { 1714 struct buffer_head *bh; 1715 unsigned long offset; 1716 ext4_group_t block_group; 1717 }; 1718 1719 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 1720 { 1721 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 1722 } 1723 1724 /* 1725 * This structure is stuffed into the struct file's private_data field 1726 * for directories. It is where we put information so that we can do 1727 * readdir operations in hash tree order. 1728 */ 1729 struct dir_private_info { 1730 struct rb_root root; 1731 struct rb_node *curr_node; 1732 struct fname *extra_fname; 1733 loff_t last_pos; 1734 __u32 curr_hash; 1735 __u32 curr_minor_hash; 1736 __u32 next_hash; 1737 }; 1738 1739 /* calculate the first block number of the group */ 1740 static inline ext4_fsblk_t 1741 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 1742 { 1743 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 1744 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 1745 } 1746 1747 /* 1748 * Special error return code only used by dx_probe() and its callers. 1749 */ 1750 #define ERR_BAD_DX_DIR -75000 1751 1752 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, 1753 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); 1754 1755 /* 1756 * Timeout and state flag for lazy initialization inode thread. 1757 */ 1758 #define EXT4_DEF_LI_WAIT_MULT 10 1759 #define EXT4_DEF_LI_MAX_START_DELAY 5 1760 #define EXT4_LAZYINIT_QUIT 0x0001 1761 #define EXT4_LAZYINIT_RUNNING 0x0002 1762 1763 /* 1764 * Lazy inode table initialization info 1765 */ 1766 struct ext4_lazy_init { 1767 unsigned long li_state; 1768 struct list_head li_request_list; 1769 struct mutex li_list_mtx; 1770 }; 1771 1772 struct ext4_li_request { 1773 struct super_block *lr_super; 1774 struct ext4_sb_info *lr_sbi; 1775 ext4_group_t lr_next_group; 1776 struct list_head lr_request; 1777 unsigned long lr_next_sched; 1778 unsigned long lr_timeout; 1779 }; 1780 1781 struct ext4_features { 1782 struct kobject f_kobj; 1783 struct completion f_kobj_unregister; 1784 }; 1785 1786 /* 1787 * This structure will be used for multiple mount protection. It will be 1788 * written into the block number saved in the s_mmp_block field in the 1789 * superblock. Programs that check MMP should assume that if 1790 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 1791 * to use the filesystem, regardless of how old the timestamp is. 1792 */ 1793 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 1794 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 1795 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 1796 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 1797 1798 struct mmp_struct { 1799 __le32 mmp_magic; /* Magic number for MMP */ 1800 __le32 mmp_seq; /* Sequence no. updated periodically */ 1801 1802 /* 1803 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 1804 * purposes and do not affect the correctness of the algorithm 1805 */ 1806 __le64 mmp_time; /* Time last updated */ 1807 char mmp_nodename[64]; /* Node which last updated MMP block */ 1808 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 1809 1810 /* 1811 * mmp_check_interval is used to verify if the MMP block has been 1812 * updated on the block device. The value is updated based on the 1813 * maximum time to write the MMP block during an update cycle. 1814 */ 1815 __le16 mmp_check_interval; 1816 1817 __le16 mmp_pad1; 1818 __le32 mmp_pad2[226]; 1819 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 1820 }; 1821 1822 /* arguments passed to the mmp thread */ 1823 struct mmpd_data { 1824 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 1825 struct super_block *sb; /* super block of the fs */ 1826 }; 1827 1828 /* 1829 * Check interval multiplier 1830 * The MMP block is written every update interval and initially checked every 1831 * update interval x the multiplier (the value is then adapted based on the 1832 * write latency). The reason is that writes can be delayed under load and we 1833 * don't want readers to incorrectly assume that the filesystem is no longer 1834 * in use. 1835 */ 1836 #define EXT4_MMP_CHECK_MULT 2UL 1837 1838 /* 1839 * Minimum interval for MMP checking in seconds. 1840 */ 1841 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 1842 1843 /* 1844 * Maximum interval for MMP checking in seconds. 1845 */ 1846 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 1847 1848 /* 1849 * Function prototypes 1850 */ 1851 1852 /* 1853 * Ok, these declarations are also in <linux/kernel.h> but none of the 1854 * ext4 source programs needs to include it so they are duplicated here. 1855 */ 1856 # define NORET_TYPE /**/ 1857 # define ATTRIB_NORET __attribute__((noreturn)) 1858 # define NORET_AND noreturn, 1859 1860 /* bitmap.c */ 1861 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 1862 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 1863 struct ext4_group_desc *gdp, 1864 struct buffer_head *bh, int sz); 1865 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 1866 struct ext4_group_desc *gdp, 1867 struct buffer_head *bh, int sz); 1868 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 1869 struct ext4_group_desc *gdp, 1870 struct buffer_head *bh, int sz); 1871 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 1872 struct ext4_group_desc *gdp, 1873 struct buffer_head *bh, int sz); 1874 1875 /* balloc.c */ 1876 extern void ext4_validate_block_bitmap(struct super_block *sb, 1877 struct ext4_group_desc *desc, 1878 unsigned int block_group, 1879 struct buffer_head *bh); 1880 extern unsigned int ext4_block_group(struct super_block *sb, 1881 ext4_fsblk_t blocknr); 1882 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 1883 ext4_fsblk_t blocknr); 1884 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 1885 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 1886 ext4_group_t group); 1887 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 1888 ext4_fsblk_t goal, 1889 unsigned int flags, 1890 unsigned long *count, 1891 int *errp); 1892 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 1893 s64 nclusters, unsigned int flags); 1894 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 1895 extern void ext4_check_blocks_bitmap(struct super_block *); 1896 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 1897 ext4_group_t block_group, 1898 struct buffer_head ** bh); 1899 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1900 1901 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 1902 ext4_group_t block_group); 1903 extern int ext4_wait_block_bitmap(struct super_block *sb, 1904 ext4_group_t block_group, 1905 struct buffer_head *bh); 1906 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 1907 ext4_group_t block_group); 1908 extern void ext4_init_block_bitmap(struct super_block *sb, 1909 struct buffer_head *bh, 1910 ext4_group_t group, 1911 struct ext4_group_desc *desc); 1912 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 1913 ext4_group_t block_group, 1914 struct ext4_group_desc *gdp); 1915 extern unsigned ext4_num_overhead_clusters(struct super_block *sb, 1916 ext4_group_t block_group, 1917 struct ext4_group_desc *gdp); 1918 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 1919 1920 /* dir.c */ 1921 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 1922 struct file *, 1923 struct ext4_dir_entry_2 *, 1924 struct buffer_head *, unsigned int); 1925 #define ext4_check_dir_entry(dir, filp, de, bh, offset) \ 1926 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 1927 (de), (bh), (offset))) 1928 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 1929 __u32 minor_hash, 1930 struct ext4_dir_entry_2 *dirent); 1931 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 1932 1933 /* fsync.c */ 1934 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 1935 extern int ext4_flush_completed_IO(struct inode *); 1936 1937 /* hash.c */ 1938 extern int ext4fs_dirhash(const char *name, int len, struct 1939 dx_hash_info *hinfo); 1940 1941 /* ialloc.c */ 1942 extern struct inode *ext4_new_inode(handle_t *, struct inode *, umode_t, 1943 const struct qstr *qstr, __u32 goal, 1944 uid_t *owner); 1945 extern void ext4_free_inode(handle_t *, struct inode *); 1946 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 1947 extern unsigned long ext4_count_free_inodes(struct super_block *); 1948 extern unsigned long ext4_count_dirs(struct super_block *); 1949 extern void ext4_check_inodes_bitmap(struct super_block *); 1950 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 1951 extern int ext4_init_inode_table(struct super_block *sb, 1952 ext4_group_t group, int barrier); 1953 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 1954 1955 /* mballoc.c */ 1956 extern long ext4_mb_stats; 1957 extern long ext4_mb_max_to_scan; 1958 extern int ext4_mb_init(struct super_block *); 1959 extern int ext4_mb_release(struct super_block *); 1960 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 1961 struct ext4_allocation_request *, int *); 1962 extern int ext4_mb_reserve_blocks(struct super_block *, int); 1963 extern void ext4_discard_preallocations(struct inode *); 1964 extern int __init ext4_init_mballoc(void); 1965 extern void ext4_exit_mballoc(void); 1966 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 1967 struct buffer_head *bh, ext4_fsblk_t block, 1968 unsigned long count, int flags); 1969 extern int ext4_mb_add_groupinfo(struct super_block *sb, 1970 ext4_group_t i, struct ext4_group_desc *desc); 1971 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 1972 ext4_fsblk_t block, unsigned long count); 1973 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 1974 1975 /* inode.c */ 1976 struct buffer_head *ext4_getblk(handle_t *, struct inode *, 1977 ext4_lblk_t, int, int *); 1978 struct buffer_head *ext4_bread(handle_t *, struct inode *, 1979 ext4_lblk_t, int, int *); 1980 int ext4_get_block(struct inode *inode, sector_t iblock, 1981 struct buffer_head *bh_result, int create); 1982 1983 extern struct inode *ext4_iget(struct super_block *, unsigned long); 1984 extern int ext4_write_inode(struct inode *, struct writeback_control *); 1985 extern int ext4_setattr(struct dentry *, struct iattr *); 1986 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 1987 struct kstat *stat); 1988 extern void ext4_evict_inode(struct inode *); 1989 extern void ext4_clear_inode(struct inode *); 1990 extern int ext4_sync_inode(handle_t *, struct inode *); 1991 extern void ext4_dirty_inode(struct inode *, int); 1992 extern int ext4_change_inode_journal_flag(struct inode *, int); 1993 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 1994 extern int ext4_can_truncate(struct inode *inode); 1995 extern void ext4_truncate(struct inode *); 1996 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length); 1997 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 1998 extern void ext4_set_inode_flags(struct inode *); 1999 extern void ext4_get_inode_flags(struct ext4_inode_info *); 2000 extern int ext4_alloc_da_blocks(struct inode *inode); 2001 extern void ext4_set_aops(struct inode *inode); 2002 extern int ext4_writepage_trans_blocks(struct inode *); 2003 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2004 extern int ext4_discard_partial_page_buffers(handle_t *handle, 2005 struct address_space *mapping, loff_t from, 2006 loff_t length, int flags); 2007 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 2008 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2009 extern void ext4_da_update_reserve_space(struct inode *inode, 2010 int used, int quota_claim); 2011 2012 /* indirect.c */ 2013 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2014 struct ext4_map_blocks *map, int flags); 2015 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb, 2016 const struct iovec *iov, loff_t offset, 2017 unsigned long nr_segs); 2018 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2019 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk); 2020 extern void ext4_ind_truncate(struct inode *inode); 2021 2022 /* ioctl.c */ 2023 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2024 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2025 2026 /* migrate.c */ 2027 extern int ext4_ext_migrate(struct inode *); 2028 2029 /* namei.c */ 2030 extern int ext4_dirent_csum_verify(struct inode *inode, 2031 struct ext4_dir_entry *dirent); 2032 extern int ext4_orphan_add(handle_t *, struct inode *); 2033 extern int ext4_orphan_del(handle_t *, struct inode *); 2034 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2035 __u32 start_minor_hash, __u32 *next_hash); 2036 2037 /* resize.c */ 2038 extern int ext4_group_add(struct super_block *sb, 2039 struct ext4_new_group_data *input); 2040 extern int ext4_group_extend(struct super_block *sb, 2041 struct ext4_super_block *es, 2042 ext4_fsblk_t n_blocks_count); 2043 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2044 2045 /* super.c */ 2046 extern int ext4_calculate_overhead(struct super_block *sb); 2047 extern int ext4_superblock_csum_verify(struct super_block *sb, 2048 struct ext4_super_block *es); 2049 extern void ext4_superblock_csum_set(struct super_block *sb, 2050 struct ext4_super_block *es); 2051 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 2052 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 2053 extern void ext4_kvfree(void *ptr); 2054 extern __printf(4, 5) 2055 void __ext4_error(struct super_block *, const char *, unsigned int, 2056 const char *, ...); 2057 #define ext4_error(sb, message...) __ext4_error(sb, __func__, \ 2058 __LINE__, ## message) 2059 extern __printf(5, 6) 2060 void ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2061 const char *, ...); 2062 extern __printf(5, 6) 2063 void ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2064 const char *, ...); 2065 extern void __ext4_std_error(struct super_block *, const char *, 2066 unsigned int, int); 2067 extern __printf(4, 5) 2068 void __ext4_abort(struct super_block *, const char *, unsigned int, 2069 const char *, ...); 2070 #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \ 2071 __LINE__, ## message) 2072 extern __printf(4, 5) 2073 void __ext4_warning(struct super_block *, const char *, unsigned int, 2074 const char *, ...); 2075 #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \ 2076 __LINE__, ## message) 2077 extern __printf(3, 4) 2078 void ext4_msg(struct super_block *, const char *, const char *, ...); 2079 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2080 const char *, unsigned int, const char *); 2081 #define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \ 2082 __LINE__, msg) 2083 extern __printf(7, 8) 2084 void __ext4_grp_locked_error(const char *, unsigned int, 2085 struct super_block *, ext4_group_t, 2086 unsigned long, ext4_fsblk_t, 2087 const char *, ...); 2088 #define ext4_grp_locked_error(sb, grp, message...) \ 2089 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message) 2090 extern void ext4_update_dynamic_rev(struct super_block *sb); 2091 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2092 __u32 compat); 2093 extern int ext4_update_rocompat_feature(handle_t *handle, 2094 struct super_block *sb, __u32 rocompat); 2095 extern int ext4_update_incompat_feature(handle_t *handle, 2096 struct super_block *sb, __u32 incompat); 2097 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2098 struct ext4_group_desc *bg); 2099 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2100 struct ext4_group_desc *bg); 2101 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2102 struct ext4_group_desc *bg); 2103 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2104 struct ext4_group_desc *bg); 2105 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2106 struct ext4_group_desc *bg); 2107 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2108 struct ext4_group_desc *bg); 2109 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2110 struct ext4_group_desc *bg); 2111 extern void ext4_block_bitmap_set(struct super_block *sb, 2112 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2113 extern void ext4_inode_bitmap_set(struct super_block *sb, 2114 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2115 extern void ext4_inode_table_set(struct super_block *sb, 2116 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2117 extern void ext4_free_group_clusters_set(struct super_block *sb, 2118 struct ext4_group_desc *bg, 2119 __u32 count); 2120 extern void ext4_free_inodes_set(struct super_block *sb, 2121 struct ext4_group_desc *bg, __u32 count); 2122 extern void ext4_used_dirs_set(struct super_block *sb, 2123 struct ext4_group_desc *bg, __u32 count); 2124 extern void ext4_itable_unused_set(struct super_block *sb, 2125 struct ext4_group_desc *bg, __u32 count); 2126 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2127 struct ext4_group_desc *gdp); 2128 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2129 struct ext4_group_desc *gdp); 2130 2131 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2132 { 2133 return EXT4_HAS_RO_COMPAT_FEATURE(sb, 2134 EXT4_FEATURE_RO_COMPAT_GDT_CSUM | 2135 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM); 2136 } 2137 2138 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2139 { 2140 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2141 le32_to_cpu(es->s_blocks_count_lo); 2142 } 2143 2144 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2145 { 2146 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2147 le32_to_cpu(es->s_r_blocks_count_lo); 2148 } 2149 2150 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2151 { 2152 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2153 le32_to_cpu(es->s_free_blocks_count_lo); 2154 } 2155 2156 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2157 ext4_fsblk_t blk) 2158 { 2159 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2160 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2161 } 2162 2163 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2164 ext4_fsblk_t blk) 2165 { 2166 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2167 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2168 } 2169 2170 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2171 ext4_fsblk_t blk) 2172 { 2173 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2174 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2175 } 2176 2177 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 2178 { 2179 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2180 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2181 le32_to_cpu(raw_inode->i_size_lo); 2182 else 2183 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2184 } 2185 2186 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2187 { 2188 raw_inode->i_size_lo = cpu_to_le32(i_size); 2189 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2190 } 2191 2192 static inline 2193 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2194 ext4_group_t group) 2195 { 2196 struct ext4_group_info ***grp_info; 2197 long indexv, indexh; 2198 grp_info = EXT4_SB(sb)->s_group_info; 2199 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2200 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2201 return grp_info[indexv][indexh]; 2202 } 2203 2204 /* 2205 * Reading s_groups_count requires using smp_rmb() afterwards. See 2206 * the locking protocol documented in the comments of ext4_group_add() 2207 * in resize.c 2208 */ 2209 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2210 { 2211 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2212 2213 smp_rmb(); 2214 return ngroups; 2215 } 2216 2217 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2218 ext4_group_t block_group) 2219 { 2220 return block_group >> sbi->s_log_groups_per_flex; 2221 } 2222 2223 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2224 { 2225 return 1 << sbi->s_log_groups_per_flex; 2226 } 2227 2228 #define ext4_std_error(sb, errno) \ 2229 do { \ 2230 if ((errno)) \ 2231 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2232 } while (0) 2233 2234 #ifdef CONFIG_SMP 2235 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2236 * counters. So we need to make sure we have free clusters more 2237 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2238 */ 2239 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2240 #else 2241 #define EXT4_FREECLUSTERS_WATERMARK 0 2242 #endif 2243 2244 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2245 { 2246 /* 2247 * XXX: replace with spinlock if seen contended -bzzz 2248 */ 2249 down_write(&EXT4_I(inode)->i_data_sem); 2250 if (newsize > EXT4_I(inode)->i_disksize) 2251 EXT4_I(inode)->i_disksize = newsize; 2252 up_write(&EXT4_I(inode)->i_data_sem); 2253 return ; 2254 } 2255 2256 struct ext4_group_info { 2257 unsigned long bb_state; 2258 struct rb_root bb_free_root; 2259 ext4_grpblk_t bb_first_free; /* first free block */ 2260 ext4_grpblk_t bb_free; /* total free blocks */ 2261 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 2262 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 2263 struct list_head bb_prealloc_list; 2264 #ifdef DOUBLE_CHECK 2265 void *bb_bitmap; 2266 #endif 2267 struct rw_semaphore alloc_sem; 2268 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2269 * regions, index is order. 2270 * bb_counters[3] = 5 means 2271 * 5 free 8-block regions. */ 2272 }; 2273 2274 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 2275 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 2276 2277 #define EXT4_MB_GRP_NEED_INIT(grp) \ 2278 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 2279 2280 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 2281 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2282 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 2283 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2284 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 2285 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2286 2287 #define EXT4_MAX_CONTENTION 8 2288 #define EXT4_CONTENTION_THRESHOLD 2 2289 2290 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2291 ext4_group_t group) 2292 { 2293 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2294 } 2295 2296 /* 2297 * Returns true if the filesystem is busy enough that attempts to 2298 * access the block group locks has run into contention. 2299 */ 2300 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 2301 { 2302 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 2303 } 2304 2305 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 2306 { 2307 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 2308 if (spin_trylock(lock)) 2309 /* 2310 * We're able to grab the lock right away, so drop the 2311 * lock contention counter. 2312 */ 2313 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 2314 else { 2315 /* 2316 * The lock is busy, so bump the contention counter, 2317 * and then wait on the spin lock. 2318 */ 2319 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 2320 EXT4_MAX_CONTENTION); 2321 spin_lock(lock); 2322 } 2323 } 2324 2325 static inline void ext4_unlock_group(struct super_block *sb, 2326 ext4_group_t group) 2327 { 2328 spin_unlock(ext4_group_lock_ptr(sb, group)); 2329 } 2330 2331 /* 2332 * Block validity checking 2333 */ 2334 #define ext4_check_indirect_blockref(inode, bh) \ 2335 ext4_check_blockref(__func__, __LINE__, inode, \ 2336 (__le32 *)(bh)->b_data, \ 2337 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 2338 2339 #define ext4_ind_check_inode(inode) \ 2340 ext4_check_blockref(__func__, __LINE__, inode, \ 2341 EXT4_I(inode)->i_data, \ 2342 EXT4_NDIR_BLOCKS) 2343 2344 /* 2345 * Inodes and files operations 2346 */ 2347 2348 /* dir.c */ 2349 extern const struct file_operations ext4_dir_operations; 2350 2351 /* file.c */ 2352 extern const struct inode_operations ext4_file_inode_operations; 2353 extern const struct file_operations ext4_file_operations; 2354 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 2355 2356 /* namei.c */ 2357 extern const struct inode_operations ext4_dir_inode_operations; 2358 extern const struct inode_operations ext4_special_inode_operations; 2359 extern struct dentry *ext4_get_parent(struct dentry *child); 2360 2361 /* symlink.c */ 2362 extern const struct inode_operations ext4_symlink_inode_operations; 2363 extern const struct inode_operations ext4_fast_symlink_inode_operations; 2364 2365 /* block_validity */ 2366 extern void ext4_release_system_zone(struct super_block *sb); 2367 extern int ext4_setup_system_zone(struct super_block *sb); 2368 extern int __init ext4_init_system_zone(void); 2369 extern void ext4_exit_system_zone(void); 2370 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 2371 ext4_fsblk_t start_blk, 2372 unsigned int count); 2373 extern int ext4_check_blockref(const char *, unsigned int, 2374 struct inode *, __le32 *, unsigned int); 2375 2376 /* extents.c */ 2377 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 2378 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 2379 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, 2380 int chunk); 2381 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 2382 struct ext4_map_blocks *map, int flags); 2383 extern void ext4_ext_truncate(struct inode *); 2384 extern int ext4_ext_punch_hole(struct file *file, loff_t offset, 2385 loff_t length); 2386 extern void ext4_ext_init(struct super_block *); 2387 extern void ext4_ext_release(struct super_block *); 2388 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 2389 loff_t len); 2390 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset, 2391 ssize_t len); 2392 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 2393 struct ext4_map_blocks *map, int flags); 2394 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2395 __u64 start, __u64 len); 2396 /* move_extent.c */ 2397 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 2398 __u64 start_orig, __u64 start_donor, 2399 __u64 len, __u64 *moved_len); 2400 2401 /* page-io.c */ 2402 extern int __init ext4_init_pageio(void); 2403 extern void ext4_exit_pageio(void); 2404 extern void ext4_ioend_wait(struct inode *); 2405 extern void ext4_free_io_end(ext4_io_end_t *io); 2406 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 2407 extern int ext4_end_io_nolock(ext4_io_end_t *io); 2408 extern void ext4_io_submit(struct ext4_io_submit *io); 2409 extern int ext4_bio_write_page(struct ext4_io_submit *io, 2410 struct page *page, 2411 int len, 2412 struct writeback_control *wbc); 2413 2414 /* mmp.c */ 2415 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 2416 extern void ext4_mmp_csum_set(struct super_block *sb, struct mmp_struct *mmp); 2417 extern int ext4_mmp_csum_verify(struct super_block *sb, 2418 struct mmp_struct *mmp); 2419 2420 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */ 2421 enum ext4_state_bits { 2422 BH_Uninit /* blocks are allocated but uninitialized on disk */ 2423 = BH_JBDPrivateStart, 2424 BH_AllocFromCluster, /* allocated blocks were part of already 2425 * allocated cluster. Note that this flag will 2426 * never, ever appear in a buffer_head's state 2427 * flag. See EXT4_MAP_FROM_CLUSTER to see where 2428 * this is used. */ 2429 BH_Da_Mapped, /* Delayed allocated block that now has a mapping. This 2430 * flag is set when ext4_map_blocks is called on a 2431 * delayed allocated block to get its real mapping. */ 2432 }; 2433 2434 BUFFER_FNS(Uninit, uninit) 2435 TAS_BUFFER_FNS(Uninit, uninit) 2436 BUFFER_FNS(Da_Mapped, da_mapped) 2437 2438 /* 2439 * Add new method to test wether block and inode bitmaps are properly 2440 * initialized. With uninit_bg reading the block from disk is not enough 2441 * to mark the bitmap uptodate. We need to also zero-out the bitmap 2442 */ 2443 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 2444 2445 static inline int bitmap_uptodate(struct buffer_head *bh) 2446 { 2447 return (buffer_uptodate(bh) && 2448 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 2449 } 2450 static inline void set_bitmap_uptodate(struct buffer_head *bh) 2451 { 2452 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 2453 } 2454 2455 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 2456 2457 /* For ioend & aio unwritten conversion wait queues */ 2458 #define EXT4_WQ_HASH_SZ 37 2459 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 2460 EXT4_WQ_HASH_SZ]) 2461 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\ 2462 EXT4_WQ_HASH_SZ]) 2463 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 2464 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; 2465 2466 #define EXT4_RESIZING 0 2467 extern int ext4_resize_begin(struct super_block *sb); 2468 extern void ext4_resize_end(struct super_block *sb); 2469 2470 #endif /* __KERNEL__ */ 2471 2472 #include "ext4_extents.h" 2473 2474 #endif /* _EXT4_H */ 2475