1 /* 2 * ext4.h 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/include/linux/minix_fs.h 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 */ 15 16 #ifndef _EXT4_H 17 #define _EXT4_H 18 19 #include <linux/types.h> 20 #include <linux/blkdev.h> 21 #include <linux/magic.h> 22 #include <linux/jbd2.h> 23 #include <linux/quota.h> 24 #include <linux/rwsem.h> 25 #include <linux/rbtree.h> 26 #include <linux/seqlock.h> 27 #include <linux/mutex.h> 28 #include <linux/timer.h> 29 #include <linux/wait.h> 30 #include <linux/blockgroup_lock.h> 31 #include <linux/percpu_counter.h> 32 #include <crypto/hash.h> 33 #ifdef __KERNEL__ 34 #include <linux/compat.h> 35 #endif 36 37 /* 38 * The fourth extended filesystem constants/structures 39 */ 40 41 /* 42 * Define EXT4FS_DEBUG to produce debug messages 43 */ 44 #undef EXT4FS_DEBUG 45 46 /* 47 * Debug code 48 */ 49 #ifdef EXT4FS_DEBUG 50 #define ext4_debug(f, a...) \ 51 do { \ 52 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 53 __FILE__, __LINE__, __func__); \ 54 printk(KERN_DEBUG f, ## a); \ 55 } while (0) 56 #else 57 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 58 #endif 59 60 /* 61 * Turn on EXT_DEBUG to get lots of info about extents operations. 62 */ 63 #define EXT_DEBUG__ 64 #ifdef EXT_DEBUG 65 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__) 66 #else 67 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 68 #endif 69 70 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 71 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 72 73 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 74 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 75 76 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 77 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 78 79 /* data type for block offset of block group */ 80 typedef int ext4_grpblk_t; 81 82 /* data type for filesystem-wide blocks number */ 83 typedef unsigned long long ext4_fsblk_t; 84 85 /* data type for file logical block number */ 86 typedef __u32 ext4_lblk_t; 87 88 /* data type for block group number */ 89 typedef unsigned int ext4_group_t; 90 91 /* 92 * Flags used in mballoc's allocation_context flags field. 93 * 94 * Also used to show what's going on for debugging purposes when the 95 * flag field is exported via the traceport interface 96 */ 97 98 /* prefer goal again. length */ 99 #define EXT4_MB_HINT_MERGE 0x0001 100 /* blocks already reserved */ 101 #define EXT4_MB_HINT_RESERVED 0x0002 102 /* metadata is being allocated */ 103 #define EXT4_MB_HINT_METADATA 0x0004 104 /* first blocks in the file */ 105 #define EXT4_MB_HINT_FIRST 0x0008 106 /* search for the best chunk */ 107 #define EXT4_MB_HINT_BEST 0x0010 108 /* data is being allocated */ 109 #define EXT4_MB_HINT_DATA 0x0020 110 /* don't preallocate (for tails) */ 111 #define EXT4_MB_HINT_NOPREALLOC 0x0040 112 /* allocate for locality group */ 113 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 114 /* allocate goal blocks or none */ 115 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 116 /* goal is meaningful */ 117 #define EXT4_MB_HINT_TRY_GOAL 0x0200 118 /* blocks already pre-reserved by delayed allocation */ 119 #define EXT4_MB_DELALLOC_RESERVED 0x0400 120 /* We are doing stream allocation */ 121 #define EXT4_MB_STREAM_ALLOC 0x0800 122 /* Use reserved root blocks if needed */ 123 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 124 125 struct ext4_allocation_request { 126 /* target inode for block we're allocating */ 127 struct inode *inode; 128 /* how many blocks we want to allocate */ 129 unsigned int len; 130 /* logical block in target inode */ 131 ext4_lblk_t logical; 132 /* the closest logical allocated block to the left */ 133 ext4_lblk_t lleft; 134 /* the closest logical allocated block to the right */ 135 ext4_lblk_t lright; 136 /* phys. target (a hint) */ 137 ext4_fsblk_t goal; 138 /* phys. block for the closest logical allocated block to the left */ 139 ext4_fsblk_t pleft; 140 /* phys. block for the closest logical allocated block to the right */ 141 ext4_fsblk_t pright; 142 /* flags. see above EXT4_MB_HINT_* */ 143 unsigned int flags; 144 }; 145 146 /* 147 * Logical to physical block mapping, used by ext4_map_blocks() 148 * 149 * This structure is used to pass requests into ext4_map_blocks() as 150 * well as to store the information returned by ext4_map_blocks(). It 151 * takes less room on the stack than a struct buffer_head. 152 */ 153 #define EXT4_MAP_NEW (1 << BH_New) 154 #define EXT4_MAP_MAPPED (1 << BH_Mapped) 155 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 156 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 157 #define EXT4_MAP_UNINIT (1 << BH_Uninit) 158 /* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of 159 * ext4_map_blocks wants to know whether or not the underlying cluster has 160 * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that 161 * the requested mapping was from previously mapped (or delayed allocated) 162 * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster 163 * should never appear on buffer_head's state flags. 164 */ 165 #define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster) 166 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 167 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\ 168 EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER) 169 170 struct ext4_map_blocks { 171 ext4_fsblk_t m_pblk; 172 ext4_lblk_t m_lblk; 173 unsigned int m_len; 174 unsigned int m_flags; 175 }; 176 177 /* 178 * For delayed allocation tracking 179 */ 180 struct mpage_da_data { 181 struct inode *inode; 182 sector_t b_blocknr; /* start block number of extent */ 183 size_t b_size; /* size of extent */ 184 unsigned long b_state; /* state of the extent */ 185 unsigned long first_page, next_page; /* extent of pages */ 186 struct writeback_control *wbc; 187 int io_done; 188 int pages_written; 189 int retval; 190 }; 191 192 /* 193 * Flags for ext4_io_end->flags 194 */ 195 #define EXT4_IO_END_UNWRITTEN 0x0001 196 #define EXT4_IO_END_ERROR 0x0002 197 #define EXT4_IO_END_DIRECT 0x0004 198 199 struct ext4_io_page { 200 struct page *p_page; 201 atomic_t p_count; 202 }; 203 204 #define MAX_IO_PAGES 128 205 206 /* 207 * For converting uninitialized extents on a work queue. 208 * 209 * 'page' is only used from the writepage() path; 'pages' is only used for 210 * buffered writes; they are used to keep page references until conversion 211 * takes place. For AIO/DIO, neither field is filled in. 212 */ 213 typedef struct ext4_io_end { 214 struct list_head list; /* per-file finished IO list */ 215 struct inode *inode; /* file being written to */ 216 unsigned int flag; /* unwritten or not */ 217 loff_t offset; /* offset in the file */ 218 ssize_t size; /* size of the extent */ 219 struct kiocb *iocb; /* iocb struct for AIO */ 220 int result; /* error value for AIO */ 221 int num_io_pages; /* for writepages() */ 222 struct ext4_io_page *pages[MAX_IO_PAGES]; /* for writepages() */ 223 } ext4_io_end_t; 224 225 struct ext4_io_submit { 226 int io_op; 227 struct bio *io_bio; 228 ext4_io_end_t *io_end; 229 struct ext4_io_page *io_page; 230 sector_t io_next_block; 231 }; 232 233 /* 234 * Special inodes numbers 235 */ 236 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 237 #define EXT4_ROOT_INO 2 /* Root inode */ 238 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 239 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 240 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 241 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 242 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 243 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 244 245 /* First non-reserved inode for old ext4 filesystems */ 246 #define EXT4_GOOD_OLD_FIRST_INO 11 247 248 /* 249 * Maximal count of links to a file 250 */ 251 #define EXT4_LINK_MAX 65000 252 253 /* 254 * Macro-instructions used to manage several block sizes 255 */ 256 #define EXT4_MIN_BLOCK_SIZE 1024 257 #define EXT4_MAX_BLOCK_SIZE 65536 258 #define EXT4_MIN_BLOCK_LOG_SIZE 10 259 #define EXT4_MAX_BLOCK_LOG_SIZE 16 260 #ifdef __KERNEL__ 261 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 262 #else 263 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 264 #endif 265 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 266 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 267 EXT4_SB(s)->s_cluster_bits) 268 #ifdef __KERNEL__ 269 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 270 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 271 #else 272 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 273 #endif 274 #ifdef __KERNEL__ 275 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 276 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 277 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 278 #else 279 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 280 EXT4_GOOD_OLD_INODE_SIZE : \ 281 (s)->s_inode_size) 282 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 283 EXT4_GOOD_OLD_FIRST_INO : \ 284 (s)->s_first_ino) 285 #endif 286 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 287 288 /* Translate a block number to a cluster number */ 289 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 290 /* Translate a cluster number to a block number */ 291 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 292 /* Translate # of blks to # of clusters */ 293 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 294 (sbi)->s_cluster_bits) 295 296 /* 297 * Structure of a blocks group descriptor 298 */ 299 struct ext4_group_desc 300 { 301 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 302 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 303 __le32 bg_inode_table_lo; /* Inodes table block */ 304 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 305 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 306 __le16 bg_used_dirs_count_lo; /* Directories count */ 307 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 308 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 309 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 310 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 311 __le16 bg_itable_unused_lo; /* Unused inodes count */ 312 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 313 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 314 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 315 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 316 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 317 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 318 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 319 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 320 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 321 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 322 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 323 __u32 bg_reserved; 324 }; 325 326 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 327 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 328 sizeof(__le16)) 329 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 330 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 331 sizeof(__le16)) 332 333 /* 334 * Structure of a flex block group info 335 */ 336 337 struct flex_groups { 338 atomic64_t free_clusters; 339 atomic_t free_inodes; 340 atomic_t used_dirs; 341 }; 342 343 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 344 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 345 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 346 347 /* 348 * Macro-instructions used to manage group descriptors 349 */ 350 #define EXT4_MIN_DESC_SIZE 32 351 #define EXT4_MIN_DESC_SIZE_64BIT 64 352 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 353 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 354 #ifdef __KERNEL__ 355 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 356 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 357 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 358 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 359 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 360 #else 361 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 362 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 363 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 364 #endif 365 366 /* 367 * Constants relative to the data blocks 368 */ 369 #define EXT4_NDIR_BLOCKS 12 370 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 371 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 372 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 373 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 374 375 /* 376 * Inode flags 377 */ 378 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 379 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 380 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 381 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 382 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 383 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 384 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 385 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 386 /* Reserved for compression usage... */ 387 #define EXT4_DIRTY_FL 0x00000100 388 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 389 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 390 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 391 /* End compression flags --- maybe not all used */ 392 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 393 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 394 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 395 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 396 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 397 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 398 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 399 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 400 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 401 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 402 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 403 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 404 405 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 406 #define EXT4_FL_USER_MODIFIABLE 0x004380FF /* User modifiable flags */ 407 408 /* Flags that should be inherited by new inodes from their parent. */ 409 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 410 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 411 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 412 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 413 414 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 415 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 416 417 /* Flags that are appropriate for non-directories/regular files. */ 418 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 419 420 /* Mask out flags that are inappropriate for the given type of inode. */ 421 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 422 { 423 if (S_ISDIR(mode)) 424 return flags; 425 else if (S_ISREG(mode)) 426 return flags & EXT4_REG_FLMASK; 427 else 428 return flags & EXT4_OTHER_FLMASK; 429 } 430 431 /* 432 * Inode flags used for atomic set/get 433 */ 434 enum { 435 EXT4_INODE_SECRM = 0, /* Secure deletion */ 436 EXT4_INODE_UNRM = 1, /* Undelete */ 437 EXT4_INODE_COMPR = 2, /* Compress file */ 438 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 439 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 440 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 441 EXT4_INODE_NODUMP = 6, /* do not dump file */ 442 EXT4_INODE_NOATIME = 7, /* do not update atime */ 443 /* Reserved for compression usage... */ 444 EXT4_INODE_DIRTY = 8, 445 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 446 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 447 EXT4_INODE_ECOMPR = 11, /* Compression error */ 448 /* End compression flags --- maybe not all used */ 449 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 450 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 451 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 452 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 453 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 454 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 455 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 456 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 457 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 458 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 459 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 460 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 461 }; 462 463 /* 464 * Since it's pretty easy to mix up bit numbers and hex values, we use a 465 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 466 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 467 * any extra space in the compiled kernel image, otherwise, the build will fail. 468 * It's important that these values are the same, since we are using 469 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 470 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 471 * values found in ext2, ext3 and ext4 filesystems, and of course the values 472 * defined in e2fsprogs. 473 * 474 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 475 */ 476 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 477 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 478 479 static inline void ext4_check_flag_values(void) 480 { 481 CHECK_FLAG_VALUE(SECRM); 482 CHECK_FLAG_VALUE(UNRM); 483 CHECK_FLAG_VALUE(COMPR); 484 CHECK_FLAG_VALUE(SYNC); 485 CHECK_FLAG_VALUE(IMMUTABLE); 486 CHECK_FLAG_VALUE(APPEND); 487 CHECK_FLAG_VALUE(NODUMP); 488 CHECK_FLAG_VALUE(NOATIME); 489 CHECK_FLAG_VALUE(DIRTY); 490 CHECK_FLAG_VALUE(COMPRBLK); 491 CHECK_FLAG_VALUE(NOCOMPR); 492 CHECK_FLAG_VALUE(ECOMPR); 493 CHECK_FLAG_VALUE(INDEX); 494 CHECK_FLAG_VALUE(IMAGIC); 495 CHECK_FLAG_VALUE(JOURNAL_DATA); 496 CHECK_FLAG_VALUE(NOTAIL); 497 CHECK_FLAG_VALUE(DIRSYNC); 498 CHECK_FLAG_VALUE(TOPDIR); 499 CHECK_FLAG_VALUE(HUGE_FILE); 500 CHECK_FLAG_VALUE(EXTENTS); 501 CHECK_FLAG_VALUE(EA_INODE); 502 CHECK_FLAG_VALUE(EOFBLOCKS); 503 CHECK_FLAG_VALUE(INLINE_DATA); 504 CHECK_FLAG_VALUE(RESERVED); 505 } 506 507 /* Used to pass group descriptor data when online resize is done */ 508 struct ext4_new_group_input { 509 __u32 group; /* Group number for this data */ 510 __u64 block_bitmap; /* Absolute block number of block bitmap */ 511 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 512 __u64 inode_table; /* Absolute block number of inode table start */ 513 __u32 blocks_count; /* Total number of blocks in this group */ 514 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 515 __u16 unused; 516 }; 517 518 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 519 struct compat_ext4_new_group_input { 520 u32 group; 521 compat_u64 block_bitmap; 522 compat_u64 inode_bitmap; 523 compat_u64 inode_table; 524 u32 blocks_count; 525 u16 reserved_blocks; 526 u16 unused; 527 }; 528 #endif 529 530 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 531 struct ext4_new_group_data { 532 __u32 group; 533 __u64 block_bitmap; 534 __u64 inode_bitmap; 535 __u64 inode_table; 536 __u32 blocks_count; 537 __u16 reserved_blocks; 538 __u16 unused; 539 __u32 free_blocks_count; 540 }; 541 542 /* Indexes used to index group tables in ext4_new_group_data */ 543 enum { 544 BLOCK_BITMAP = 0, /* block bitmap */ 545 INODE_BITMAP, /* inode bitmap */ 546 INODE_TABLE, /* inode tables */ 547 GROUP_TABLE_COUNT, 548 }; 549 550 /* 551 * Flags used by ext4_map_blocks() 552 */ 553 /* Allocate any needed blocks and/or convert an unitialized 554 extent to be an initialized ext4 */ 555 #define EXT4_GET_BLOCKS_CREATE 0x0001 556 /* Request the creation of an unitialized extent */ 557 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 558 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ 559 EXT4_GET_BLOCKS_CREATE) 560 /* Caller is from the delayed allocation writeout path, 561 so set the magic i_delalloc_reserve_flag after taking the 562 inode allocation semaphore for */ 563 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 564 /* caller is from the direct IO path, request to creation of an 565 unitialized extents if not allocated, split the uninitialized 566 extent if blocks has been preallocated already*/ 567 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 568 #define EXT4_GET_BLOCKS_CONVERT 0x0010 569 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 570 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 571 /* Convert extent to initialized after IO complete */ 572 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 573 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 574 /* Punch out blocks of an extent */ 575 #define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020 576 /* Don't normalize allocation size (used for fallocate) */ 577 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 578 /* Request will not result in inode size update (user for fallocate) */ 579 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 580 /* Do not take i_data_sem locking in ext4_map_blocks */ 581 #define EXT4_GET_BLOCKS_NO_LOCK 0x0100 582 /* Do not put hole in extent cache */ 583 #define EXT4_GET_BLOCKS_NO_PUT_HOLE 0x0200 584 585 /* 586 * Flags used by ext4_free_blocks 587 */ 588 #define EXT4_FREE_BLOCKS_METADATA 0x0001 589 #define EXT4_FREE_BLOCKS_FORGET 0x0002 590 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 591 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 592 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 593 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 594 595 /* 596 * Flags used by ext4_discard_partial_page_buffers 597 */ 598 #define EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED 0x0001 599 600 /* 601 * ioctl commands 602 */ 603 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 604 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 605 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 606 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 607 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 608 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 609 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 610 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 611 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 612 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 613 #define EXT4_IOC_MIGRATE _IO('f', 9) 614 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 615 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 616 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 617 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 618 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 619 620 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 621 /* 622 * ioctl commands in 32 bit emulation 623 */ 624 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 625 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 626 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 627 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 628 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 629 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 630 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 631 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 632 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 633 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 634 #endif 635 636 /* Max physical block we can address w/o extents */ 637 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 638 639 /* 640 * Structure of an inode on the disk 641 */ 642 struct ext4_inode { 643 __le16 i_mode; /* File mode */ 644 __le16 i_uid; /* Low 16 bits of Owner Uid */ 645 __le32 i_size_lo; /* Size in bytes */ 646 __le32 i_atime; /* Access time */ 647 __le32 i_ctime; /* Inode Change time */ 648 __le32 i_mtime; /* Modification time */ 649 __le32 i_dtime; /* Deletion Time */ 650 __le16 i_gid; /* Low 16 bits of Group Id */ 651 __le16 i_links_count; /* Links count */ 652 __le32 i_blocks_lo; /* Blocks count */ 653 __le32 i_flags; /* File flags */ 654 union { 655 struct { 656 __le32 l_i_version; 657 } linux1; 658 struct { 659 __u32 h_i_translator; 660 } hurd1; 661 struct { 662 __u32 m_i_reserved1; 663 } masix1; 664 } osd1; /* OS dependent 1 */ 665 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 666 __le32 i_generation; /* File version (for NFS) */ 667 __le32 i_file_acl_lo; /* File ACL */ 668 __le32 i_size_high; 669 __le32 i_obso_faddr; /* Obsoleted fragment address */ 670 union { 671 struct { 672 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 673 __le16 l_i_file_acl_high; 674 __le16 l_i_uid_high; /* these 2 fields */ 675 __le16 l_i_gid_high; /* were reserved2[0] */ 676 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 677 __le16 l_i_reserved; 678 } linux2; 679 struct { 680 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 681 __u16 h_i_mode_high; 682 __u16 h_i_uid_high; 683 __u16 h_i_gid_high; 684 __u32 h_i_author; 685 } hurd2; 686 struct { 687 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 688 __le16 m_i_file_acl_high; 689 __u32 m_i_reserved2[2]; 690 } masix2; 691 } osd2; /* OS dependent 2 */ 692 __le16 i_extra_isize; 693 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 694 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 695 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 696 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 697 __le32 i_crtime; /* File Creation time */ 698 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 699 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 700 }; 701 702 struct move_extent { 703 __u32 reserved; /* should be zero */ 704 __u32 donor_fd; /* donor file descriptor */ 705 __u64 orig_start; /* logical start offset in block for orig */ 706 __u64 donor_start; /* logical start offset in block for donor */ 707 __u64 len; /* block length to be moved */ 708 __u64 moved_len; /* moved block length */ 709 }; 710 711 #define EXT4_EPOCH_BITS 2 712 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 713 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 714 715 /* 716 * Extended fields will fit into an inode if the filesystem was formatted 717 * with large inodes (-I 256 or larger) and there are not currently any EAs 718 * consuming all of the available space. For new inodes we always reserve 719 * enough space for the kernel's known extended fields, but for inodes 720 * created with an old kernel this might not have been the case. None of 721 * the extended inode fields is critical for correct filesystem operation. 722 * This macro checks if a certain field fits in the inode. Note that 723 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 724 */ 725 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 726 ((offsetof(typeof(*ext4_inode), field) + \ 727 sizeof((ext4_inode)->field)) \ 728 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 729 (einode)->i_extra_isize)) \ 730 731 static inline __le32 ext4_encode_extra_time(struct timespec *time) 732 { 733 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 734 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | 735 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); 736 } 737 738 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 739 { 740 if (sizeof(time->tv_sec) > 4) 741 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 742 << 32; 743 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 744 } 745 746 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 747 do { \ 748 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 749 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 750 (raw_inode)->xtime ## _extra = \ 751 ext4_encode_extra_time(&(inode)->xtime); \ 752 } while (0) 753 754 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 755 do { \ 756 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 757 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 758 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 759 (raw_inode)->xtime ## _extra = \ 760 ext4_encode_extra_time(&(einode)->xtime); \ 761 } while (0) 762 763 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 764 do { \ 765 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 766 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 767 ext4_decode_extra_time(&(inode)->xtime, \ 768 raw_inode->xtime ## _extra); \ 769 else \ 770 (inode)->xtime.tv_nsec = 0; \ 771 } while (0) 772 773 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 774 do { \ 775 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 776 (einode)->xtime.tv_sec = \ 777 (signed)le32_to_cpu((raw_inode)->xtime); \ 778 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 779 ext4_decode_extra_time(&(einode)->xtime, \ 780 raw_inode->xtime ## _extra); \ 781 else \ 782 (einode)->xtime.tv_nsec = 0; \ 783 } while (0) 784 785 #define i_disk_version osd1.linux1.l_i_version 786 787 #if defined(__KERNEL__) || defined(__linux__) 788 #define i_reserved1 osd1.linux1.l_i_reserved1 789 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 790 #define i_blocks_high osd2.linux2.l_i_blocks_high 791 #define i_uid_low i_uid 792 #define i_gid_low i_gid 793 #define i_uid_high osd2.linux2.l_i_uid_high 794 #define i_gid_high osd2.linux2.l_i_gid_high 795 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 796 797 #elif defined(__GNU__) 798 799 #define i_translator osd1.hurd1.h_i_translator 800 #define i_uid_high osd2.hurd2.h_i_uid_high 801 #define i_gid_high osd2.hurd2.h_i_gid_high 802 #define i_author osd2.hurd2.h_i_author 803 804 #elif defined(__masix__) 805 806 #define i_reserved1 osd1.masix1.m_i_reserved1 807 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 808 #define i_reserved2 osd2.masix2.m_i_reserved2 809 810 #endif /* defined(__KERNEL__) || defined(__linux__) */ 811 812 #include "extents_status.h" 813 814 /* 815 * fourth extended file system inode data in memory 816 */ 817 struct ext4_inode_info { 818 __le32 i_data[15]; /* unconverted */ 819 __u32 i_dtime; 820 ext4_fsblk_t i_file_acl; 821 822 /* 823 * i_block_group is the number of the block group which contains 824 * this file's inode. Constant across the lifetime of the inode, 825 * it is ued for making block allocation decisions - we try to 826 * place a file's data blocks near its inode block, and new inodes 827 * near to their parent directory's inode. 828 */ 829 ext4_group_t i_block_group; 830 ext4_lblk_t i_dir_start_lookup; 831 #if (BITS_PER_LONG < 64) 832 unsigned long i_state_flags; /* Dynamic state flags */ 833 #endif 834 unsigned long i_flags; 835 836 /* 837 * Extended attributes can be read independently of the main file 838 * data. Taking i_mutex even when reading would cause contention 839 * between readers of EAs and writers of regular file data, so 840 * instead we synchronize on xattr_sem when reading or changing 841 * EAs. 842 */ 843 struct rw_semaphore xattr_sem; 844 845 struct list_head i_orphan; /* unlinked but open inodes */ 846 847 /* 848 * i_disksize keeps track of what the inode size is ON DISK, not 849 * in memory. During truncate, i_size is set to the new size by 850 * the VFS prior to calling ext4_truncate(), but the filesystem won't 851 * set i_disksize to 0 until the truncate is actually under way. 852 * 853 * The intent is that i_disksize always represents the blocks which 854 * are used by this file. This allows recovery to restart truncate 855 * on orphans if we crash during truncate. We actually write i_disksize 856 * into the on-disk inode when writing inodes out, instead of i_size. 857 * 858 * The only time when i_disksize and i_size may be different is when 859 * a truncate is in progress. The only things which change i_disksize 860 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 861 */ 862 loff_t i_disksize; 863 864 /* 865 * i_data_sem is for serialising ext4_truncate() against 866 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 867 * data tree are chopped off during truncate. We can't do that in 868 * ext4 because whenever we perform intermediate commits during 869 * truncate, the inode and all the metadata blocks *must* be in a 870 * consistent state which allows truncation of the orphans to restart 871 * during recovery. Hence we must fix the get_block-vs-truncate race 872 * by other means, so we have i_data_sem. 873 */ 874 struct rw_semaphore i_data_sem; 875 struct inode vfs_inode; 876 struct jbd2_inode *jinode; 877 878 /* 879 * File creation time. Its function is same as that of 880 * struct timespec i_{a,c,m}time in the generic inode. 881 */ 882 struct timespec i_crtime; 883 884 /* mballoc */ 885 struct list_head i_prealloc_list; 886 spinlock_t i_prealloc_lock; 887 888 /* extents status tree */ 889 struct ext4_es_tree i_es_tree; 890 rwlock_t i_es_lock; 891 struct list_head i_es_lru; 892 unsigned int i_es_lru_nr; /* protected by i_es_lock */ 893 894 /* ialloc */ 895 ext4_group_t i_last_alloc_group; 896 897 /* allocation reservation info for delalloc */ 898 /* In case of bigalloc, these refer to clusters rather than blocks */ 899 unsigned int i_reserved_data_blocks; 900 unsigned int i_reserved_meta_blocks; 901 unsigned int i_allocated_meta_blocks; 902 ext4_lblk_t i_da_metadata_calc_last_lblock; 903 int i_da_metadata_calc_len; 904 905 /* on-disk additional length */ 906 __u16 i_extra_isize; 907 908 /* Indicate the inline data space. */ 909 u16 i_inline_off; 910 u16 i_inline_size; 911 912 #ifdef CONFIG_QUOTA 913 /* quota space reservation, managed internally by quota code */ 914 qsize_t i_reserved_quota; 915 #endif 916 917 /* completed IOs that might need unwritten extents handling */ 918 struct list_head i_completed_io_list; 919 spinlock_t i_completed_io_lock; 920 atomic_t i_ioend_count; /* Number of outstanding io_end structs */ 921 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 922 struct work_struct i_unwritten_work; /* deferred extent conversion */ 923 924 spinlock_t i_block_reservation_lock; 925 926 /* 927 * Transactions that contain inode's metadata needed to complete 928 * fsync and fdatasync, respectively. 929 */ 930 tid_t i_sync_tid; 931 tid_t i_datasync_tid; 932 933 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 934 __u32 i_csum_seed; 935 }; 936 937 /* 938 * File system states 939 */ 940 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 941 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 942 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 943 944 /* 945 * Misc. filesystem flags 946 */ 947 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 948 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 949 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 950 951 /* 952 * Mount flags 953 */ 954 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 955 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 956 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 957 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 958 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 959 #define EXT4_MOUNT_ERRORS_MASK 0x00070 960 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 961 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 962 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 963 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 964 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 965 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 966 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 967 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 968 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 969 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 970 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 971 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 972 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 973 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 974 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 975 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 976 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 977 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 978 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 979 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 980 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 981 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 982 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 983 984 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 985 specified delalloc */ 986 987 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 988 ~EXT4_MOUNT_##opt 989 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 990 EXT4_MOUNT_##opt 991 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 992 EXT4_MOUNT_##opt) 993 994 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 995 ~EXT4_MOUNT2_##opt 996 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 997 EXT4_MOUNT2_##opt 998 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 999 EXT4_MOUNT2_##opt) 1000 1001 #define ext4_test_and_set_bit __test_and_set_bit_le 1002 #define ext4_set_bit __set_bit_le 1003 #define ext4_set_bit_atomic ext2_set_bit_atomic 1004 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1005 #define ext4_clear_bit __clear_bit_le 1006 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1007 #define ext4_test_bit test_bit_le 1008 #define ext4_find_next_zero_bit find_next_zero_bit_le 1009 #define ext4_find_next_bit find_next_bit_le 1010 1011 extern void ext4_set_bits(void *bm, int cur, int len); 1012 1013 /* 1014 * Maximal mount counts between two filesystem checks 1015 */ 1016 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1017 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1018 1019 /* 1020 * Behaviour when detecting errors 1021 */ 1022 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1023 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1024 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1025 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1026 1027 /* Metadata checksum algorithm codes */ 1028 #define EXT4_CRC32C_CHKSUM 1 1029 1030 /* 1031 * Structure of the super block 1032 */ 1033 struct ext4_super_block { 1034 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1035 __le32 s_blocks_count_lo; /* Blocks count */ 1036 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1037 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1038 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1039 __le32 s_first_data_block; /* First Data Block */ 1040 __le32 s_log_block_size; /* Block size */ 1041 __le32 s_log_cluster_size; /* Allocation cluster size */ 1042 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1043 __le32 s_clusters_per_group; /* # Clusters per group */ 1044 __le32 s_inodes_per_group; /* # Inodes per group */ 1045 __le32 s_mtime; /* Mount time */ 1046 /*30*/ __le32 s_wtime; /* Write time */ 1047 __le16 s_mnt_count; /* Mount count */ 1048 __le16 s_max_mnt_count; /* Maximal mount count */ 1049 __le16 s_magic; /* Magic signature */ 1050 __le16 s_state; /* File system state */ 1051 __le16 s_errors; /* Behaviour when detecting errors */ 1052 __le16 s_minor_rev_level; /* minor revision level */ 1053 /*40*/ __le32 s_lastcheck; /* time of last check */ 1054 __le32 s_checkinterval; /* max. time between checks */ 1055 __le32 s_creator_os; /* OS */ 1056 __le32 s_rev_level; /* Revision level */ 1057 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1058 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1059 /* 1060 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1061 * 1062 * Note: the difference between the compatible feature set and 1063 * the incompatible feature set is that if there is a bit set 1064 * in the incompatible feature set that the kernel doesn't 1065 * know about, it should refuse to mount the filesystem. 1066 * 1067 * e2fsck's requirements are more strict; if it doesn't know 1068 * about a feature in either the compatible or incompatible 1069 * feature set, it must abort and not try to meddle with 1070 * things it doesn't understand... 1071 */ 1072 __le32 s_first_ino; /* First non-reserved inode */ 1073 __le16 s_inode_size; /* size of inode structure */ 1074 __le16 s_block_group_nr; /* block group # of this superblock */ 1075 __le32 s_feature_compat; /* compatible feature set */ 1076 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1077 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1078 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1079 /*78*/ char s_volume_name[16]; /* volume name */ 1080 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 1081 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1082 /* 1083 * Performance hints. Directory preallocation should only 1084 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1085 */ 1086 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1087 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1088 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1089 /* 1090 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1091 */ 1092 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1093 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1094 __le32 s_journal_dev; /* device number of journal file */ 1095 __le32 s_last_orphan; /* start of list of inodes to delete */ 1096 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1097 __u8 s_def_hash_version; /* Default hash version to use */ 1098 __u8 s_jnl_backup_type; 1099 __le16 s_desc_size; /* size of group descriptor */ 1100 /*100*/ __le32 s_default_mount_opts; 1101 __le32 s_first_meta_bg; /* First metablock block group */ 1102 __le32 s_mkfs_time; /* When the filesystem was created */ 1103 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1104 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1105 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1106 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1107 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1108 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1109 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1110 __le32 s_flags; /* Miscellaneous flags */ 1111 __le16 s_raid_stride; /* RAID stride */ 1112 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1113 __le64 s_mmp_block; /* Block for multi-mount protection */ 1114 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1115 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1116 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1117 __le16 s_reserved_pad; 1118 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1119 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1120 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1121 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1122 snapshot's future use */ 1123 __le32 s_snapshot_list; /* inode number of the head of the 1124 on-disk snapshot list */ 1125 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1126 __le32 s_error_count; /* number of fs errors */ 1127 __le32 s_first_error_time; /* first time an error happened */ 1128 __le32 s_first_error_ino; /* inode involved in first error */ 1129 __le64 s_first_error_block; /* block involved of first error */ 1130 __u8 s_first_error_func[32]; /* function where the error happened */ 1131 __le32 s_first_error_line; /* line number where error happened */ 1132 __le32 s_last_error_time; /* most recent time of an error */ 1133 __le32 s_last_error_ino; /* inode involved in last error */ 1134 __le32 s_last_error_line; /* line number where error happened */ 1135 __le64 s_last_error_block; /* block involved of last error */ 1136 __u8 s_last_error_func[32]; /* function where the error happened */ 1137 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1138 __u8 s_mount_opts[64]; 1139 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1140 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1141 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1142 __le32 s_reserved[108]; /* Padding to the end of the block */ 1143 __le32 s_checksum; /* crc32c(superblock) */ 1144 }; 1145 1146 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1147 1148 #ifdef __KERNEL__ 1149 1150 /* 1151 * run-time mount flags 1152 */ 1153 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1154 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1155 1156 /* 1157 * fourth extended-fs super-block data in memory 1158 */ 1159 struct ext4_sb_info { 1160 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1161 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1162 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1163 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1164 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1165 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1166 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1167 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1168 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1169 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1170 unsigned long s_overhead; /* # of fs overhead clusters */ 1171 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1172 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1173 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1174 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1175 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1176 struct buffer_head **s_group_desc; 1177 unsigned int s_mount_opt; 1178 unsigned int s_mount_opt2; 1179 unsigned int s_mount_flags; 1180 unsigned int s_def_mount_opt; 1181 ext4_fsblk_t s_sb_block; 1182 kuid_t s_resuid; 1183 kgid_t s_resgid; 1184 unsigned short s_mount_state; 1185 unsigned short s_pad; 1186 int s_addr_per_block_bits; 1187 int s_desc_per_block_bits; 1188 int s_inode_size; 1189 int s_first_ino; 1190 unsigned int s_inode_readahead_blks; 1191 unsigned int s_inode_goal; 1192 spinlock_t s_next_gen_lock; 1193 u32 s_next_generation; 1194 u32 s_hash_seed[4]; 1195 int s_def_hash_version; 1196 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1197 struct percpu_counter s_freeclusters_counter; 1198 struct percpu_counter s_freeinodes_counter; 1199 struct percpu_counter s_dirs_counter; 1200 struct percpu_counter s_dirtyclusters_counter; 1201 struct blockgroup_lock *s_blockgroup_lock; 1202 struct proc_dir_entry *s_proc; 1203 struct kobject s_kobj; 1204 struct completion s_kobj_unregister; 1205 struct super_block *s_sb; 1206 1207 /* Journaling */ 1208 struct journal_s *s_journal; 1209 struct list_head s_orphan; 1210 struct mutex s_orphan_lock; 1211 unsigned long s_resize_flags; /* Flags indicating if there 1212 is a resizer */ 1213 unsigned long s_commit_interval; 1214 u32 s_max_batch_time; 1215 u32 s_min_batch_time; 1216 struct block_device *journal_bdev; 1217 #ifdef CONFIG_QUOTA 1218 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ 1219 int s_jquota_fmt; /* Format of quota to use */ 1220 #endif 1221 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1222 struct rb_root system_blks; 1223 1224 #ifdef EXTENTS_STATS 1225 /* ext4 extents stats */ 1226 unsigned long s_ext_min; 1227 unsigned long s_ext_max; 1228 unsigned long s_depth_max; 1229 spinlock_t s_ext_stats_lock; 1230 unsigned long s_ext_blocks; 1231 unsigned long s_ext_extents; 1232 #endif 1233 1234 /* for buddy allocator */ 1235 struct ext4_group_info ***s_group_info; 1236 struct inode *s_buddy_cache; 1237 spinlock_t s_md_lock; 1238 unsigned short *s_mb_offsets; 1239 unsigned int *s_mb_maxs; 1240 unsigned int s_group_info_size; 1241 1242 /* tunables */ 1243 unsigned long s_stripe; 1244 unsigned int s_mb_stream_request; 1245 unsigned int s_mb_max_to_scan; 1246 unsigned int s_mb_min_to_scan; 1247 unsigned int s_mb_stats; 1248 unsigned int s_mb_order2_reqs; 1249 unsigned int s_mb_group_prealloc; 1250 unsigned int s_max_writeback_mb_bump; 1251 unsigned int s_max_dir_size_kb; 1252 /* where last allocation was done - for stream allocation */ 1253 unsigned long s_mb_last_group; 1254 unsigned long s_mb_last_start; 1255 1256 /* stats for buddy allocator */ 1257 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1258 atomic_t s_bal_success; /* we found long enough chunks */ 1259 atomic_t s_bal_allocated; /* in blocks */ 1260 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1261 atomic_t s_bal_goals; /* goal hits */ 1262 atomic_t s_bal_breaks; /* too long searches */ 1263 atomic_t s_bal_2orders; /* 2^order hits */ 1264 spinlock_t s_bal_lock; 1265 unsigned long s_mb_buddies_generated; 1266 unsigned long long s_mb_generation_time; 1267 atomic_t s_mb_lost_chunks; 1268 atomic_t s_mb_preallocated; 1269 atomic_t s_mb_discarded; 1270 atomic_t s_lock_busy; 1271 1272 /* locality groups */ 1273 struct ext4_locality_group __percpu *s_locality_groups; 1274 1275 /* for write statistics */ 1276 unsigned long s_sectors_written_start; 1277 u64 s_kbytes_written; 1278 1279 /* the size of zero-out chunk */ 1280 unsigned int s_extent_max_zeroout_kb; 1281 1282 unsigned int s_log_groups_per_flex; 1283 struct flex_groups *s_flex_groups; 1284 ext4_group_t s_flex_groups_allocated; 1285 1286 /* workqueue for dio unwritten */ 1287 struct workqueue_struct *dio_unwritten_wq; 1288 1289 /* timer for periodic error stats printing */ 1290 struct timer_list s_err_report; 1291 1292 /* Lazy inode table initialization info */ 1293 struct ext4_li_request *s_li_request; 1294 /* Wait multiplier for lazy initialization thread */ 1295 unsigned int s_li_wait_mult; 1296 1297 /* Kernel thread for multiple mount protection */ 1298 struct task_struct *s_mmp_tsk; 1299 1300 /* record the last minlen when FITRIM is called. */ 1301 atomic_t s_last_trim_minblks; 1302 1303 /* Reference to checksum algorithm driver via cryptoapi */ 1304 struct crypto_shash *s_chksum_driver; 1305 1306 /* Precomputed FS UUID checksum for seeding other checksums */ 1307 __u32 s_csum_seed; 1308 1309 /* Reclaim extents from extent status tree */ 1310 struct shrinker s_es_shrinker; 1311 struct list_head s_es_lru; 1312 struct percpu_counter s_extent_cache_cnt; 1313 spinlock_t s_es_lru_lock ____cacheline_aligned_in_smp; 1314 }; 1315 1316 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1317 { 1318 return sb->s_fs_info; 1319 } 1320 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1321 { 1322 return container_of(inode, struct ext4_inode_info, vfs_inode); 1323 } 1324 1325 static inline struct timespec ext4_current_time(struct inode *inode) 1326 { 1327 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1328 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1329 } 1330 1331 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1332 { 1333 return ino == EXT4_ROOT_INO || 1334 ino == EXT4_USR_QUOTA_INO || 1335 ino == EXT4_GRP_QUOTA_INO || 1336 ino == EXT4_JOURNAL_INO || 1337 ino == EXT4_RESIZE_INO || 1338 (ino >= EXT4_FIRST_INO(sb) && 1339 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1340 } 1341 1342 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 1343 struct ext4_io_end *io_end) 1344 { 1345 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 1346 io_end->flag |= EXT4_IO_END_UNWRITTEN; 1347 atomic_inc(&EXT4_I(inode)->i_unwritten); 1348 } 1349 } 1350 1351 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode) 1352 { 1353 return inode->i_private; 1354 } 1355 1356 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io) 1357 { 1358 inode->i_private = io; 1359 } 1360 1361 /* 1362 * Inode dynamic state flags 1363 */ 1364 enum { 1365 EXT4_STATE_JDATA, /* journaled data exists */ 1366 EXT4_STATE_NEW, /* inode is newly created */ 1367 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1368 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1369 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1370 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1371 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1372 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1373 EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */ 1374 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read 1375 nolocking */ 1376 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1377 EXT4_STATE_ORDERED_MODE, /* data=ordered mode */ 1378 }; 1379 1380 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1381 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1382 { \ 1383 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1384 } \ 1385 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1386 { \ 1387 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1388 } \ 1389 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1390 { \ 1391 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1392 } 1393 1394 EXT4_INODE_BIT_FNS(flag, flags, 0) 1395 #if (BITS_PER_LONG < 64) 1396 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1397 1398 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1399 { 1400 (ei)->i_state_flags = 0; 1401 } 1402 #else 1403 EXT4_INODE_BIT_FNS(state, flags, 32) 1404 1405 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1406 { 1407 /* We depend on the fact that callers will set i_flags */ 1408 } 1409 #endif 1410 #else 1411 /* Assume that user mode programs are passing in an ext4fs superblock, not 1412 * a kernel struct super_block. This will allow us to call the feature-test 1413 * macros from user land. */ 1414 #define EXT4_SB(sb) (sb) 1415 #endif 1416 1417 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1418 1419 /* 1420 * Codes for operating systems 1421 */ 1422 #define EXT4_OS_LINUX 0 1423 #define EXT4_OS_HURD 1 1424 #define EXT4_OS_MASIX 2 1425 #define EXT4_OS_FREEBSD 3 1426 #define EXT4_OS_LITES 4 1427 1428 /* 1429 * Revision levels 1430 */ 1431 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1432 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1433 1434 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1435 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1436 1437 #define EXT4_GOOD_OLD_INODE_SIZE 128 1438 1439 /* 1440 * Feature set definitions 1441 */ 1442 1443 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1444 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1445 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1446 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1447 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1448 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1449 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1450 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1451 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1452 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1453 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1454 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1455 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1456 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1457 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1458 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1459 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1460 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1461 1462 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1463 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1464 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1465 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1466 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1467 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1468 1469 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1470 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1471 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1472 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1473 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1474 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1475 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1476 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1477 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1478 /* 1479 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1480 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1481 * all other data structures' checksums. However, the METADATA_CSUM and 1482 * GDT_CSUM bits are mutually exclusive. 1483 */ 1484 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1485 1486 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1487 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1488 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1489 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1490 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1491 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1492 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1493 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1494 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1495 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1496 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1497 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */ 1498 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1499 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1500 1501 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1502 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1503 EXT4_FEATURE_INCOMPAT_META_BG) 1504 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1505 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1506 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1507 1508 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1509 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1510 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1511 EXT4_FEATURE_INCOMPAT_META_BG) 1512 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1513 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1514 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1515 1516 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 1517 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1518 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1519 EXT4_FEATURE_INCOMPAT_META_BG| \ 1520 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1521 EXT4_FEATURE_INCOMPAT_64BIT| \ 1522 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1523 EXT4_FEATURE_INCOMPAT_MMP | \ 1524 EXT4_FEATURE_INCOMPAT_INLINE_DATA) 1525 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1526 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1527 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1528 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1529 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1530 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1531 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1532 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1533 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1534 EXT4_FEATURE_RO_COMPAT_QUOTA) 1535 1536 /* 1537 * Default values for user and/or group using reserved blocks 1538 */ 1539 #define EXT4_DEF_RESUID 0 1540 #define EXT4_DEF_RESGID 0 1541 1542 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1543 1544 /* 1545 * Default mount options 1546 */ 1547 #define EXT4_DEFM_DEBUG 0x0001 1548 #define EXT4_DEFM_BSDGROUPS 0x0002 1549 #define EXT4_DEFM_XATTR_USER 0x0004 1550 #define EXT4_DEFM_ACL 0x0008 1551 #define EXT4_DEFM_UID16 0x0010 1552 #define EXT4_DEFM_JMODE 0x0060 1553 #define EXT4_DEFM_JMODE_DATA 0x0020 1554 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1555 #define EXT4_DEFM_JMODE_WBACK 0x0060 1556 #define EXT4_DEFM_NOBARRIER 0x0100 1557 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1558 #define EXT4_DEFM_DISCARD 0x0400 1559 #define EXT4_DEFM_NODELALLOC 0x0800 1560 1561 /* 1562 * Default journal batch times 1563 */ 1564 #define EXT4_DEF_MIN_BATCH_TIME 0 1565 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1566 1567 /* 1568 * Minimum number of groups in a flexgroup before we separate out 1569 * directories into the first block group of a flexgroup 1570 */ 1571 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1572 1573 /* 1574 * Structure of a directory entry 1575 */ 1576 #define EXT4_NAME_LEN 255 1577 1578 struct ext4_dir_entry { 1579 __le32 inode; /* Inode number */ 1580 __le16 rec_len; /* Directory entry length */ 1581 __le16 name_len; /* Name length */ 1582 char name[EXT4_NAME_LEN]; /* File name */ 1583 }; 1584 1585 /* 1586 * The new version of the directory entry. Since EXT4 structures are 1587 * stored in intel byte order, and the name_len field could never be 1588 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1589 * file_type field. 1590 */ 1591 struct ext4_dir_entry_2 { 1592 __le32 inode; /* Inode number */ 1593 __le16 rec_len; /* Directory entry length */ 1594 __u8 name_len; /* Name length */ 1595 __u8 file_type; 1596 char name[EXT4_NAME_LEN]; /* File name */ 1597 }; 1598 1599 /* 1600 * This is a bogus directory entry at the end of each leaf block that 1601 * records checksums. 1602 */ 1603 struct ext4_dir_entry_tail { 1604 __le32 det_reserved_zero1; /* Pretend to be unused */ 1605 __le16 det_rec_len; /* 12 */ 1606 __u8 det_reserved_zero2; /* Zero name length */ 1607 __u8 det_reserved_ft; /* 0xDE, fake file type */ 1608 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1609 }; 1610 1611 #define EXT4_DIRENT_TAIL(block, blocksize) \ 1612 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 1613 ((blocksize) - \ 1614 sizeof(struct ext4_dir_entry_tail)))) 1615 1616 /* 1617 * Ext4 directory file types. Only the low 3 bits are used. The 1618 * other bits are reserved for now. 1619 */ 1620 #define EXT4_FT_UNKNOWN 0 1621 #define EXT4_FT_REG_FILE 1 1622 #define EXT4_FT_DIR 2 1623 #define EXT4_FT_CHRDEV 3 1624 #define EXT4_FT_BLKDEV 4 1625 #define EXT4_FT_FIFO 5 1626 #define EXT4_FT_SOCK 6 1627 #define EXT4_FT_SYMLINK 7 1628 1629 #define EXT4_FT_MAX 8 1630 1631 #define EXT4_FT_DIR_CSUM 0xDE 1632 1633 /* 1634 * EXT4_DIR_PAD defines the directory entries boundaries 1635 * 1636 * NOTE: It must be a multiple of 4 1637 */ 1638 #define EXT4_DIR_PAD 4 1639 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1640 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1641 ~EXT4_DIR_ROUND) 1642 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1643 1644 /* 1645 * If we ever get support for fs block sizes > page_size, we'll need 1646 * to remove the #if statements in the next two functions... 1647 */ 1648 static inline unsigned int 1649 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1650 { 1651 unsigned len = le16_to_cpu(dlen); 1652 1653 #if (PAGE_CACHE_SIZE >= 65536) 1654 if (len == EXT4_MAX_REC_LEN || len == 0) 1655 return blocksize; 1656 return (len & 65532) | ((len & 3) << 16); 1657 #else 1658 return len; 1659 #endif 1660 } 1661 1662 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1663 { 1664 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1665 BUG(); 1666 #if (PAGE_CACHE_SIZE >= 65536) 1667 if (len < 65536) 1668 return cpu_to_le16(len); 1669 if (len == blocksize) { 1670 if (blocksize == 65536) 1671 return cpu_to_le16(EXT4_MAX_REC_LEN); 1672 else 1673 return cpu_to_le16(0); 1674 } 1675 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 1676 #else 1677 return cpu_to_le16(len); 1678 #endif 1679 } 1680 1681 /* 1682 * Hash Tree Directory indexing 1683 * (c) Daniel Phillips, 2001 1684 */ 1685 1686 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 1687 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 1688 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 1689 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 1690 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 1691 1692 /* Legal values for the dx_root hash_version field: */ 1693 1694 #define DX_HASH_LEGACY 0 1695 #define DX_HASH_HALF_MD4 1 1696 #define DX_HASH_TEA 2 1697 #define DX_HASH_LEGACY_UNSIGNED 3 1698 #define DX_HASH_HALF_MD4_UNSIGNED 4 1699 #define DX_HASH_TEA_UNSIGNED 5 1700 1701 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 1702 const void *address, unsigned int length) 1703 { 1704 struct { 1705 struct shash_desc shash; 1706 char ctx[4]; 1707 } desc; 1708 int err; 1709 1710 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 1711 1712 desc.shash.tfm = sbi->s_chksum_driver; 1713 desc.shash.flags = 0; 1714 *(u32 *)desc.ctx = crc; 1715 1716 err = crypto_shash_update(&desc.shash, address, length); 1717 BUG_ON(err); 1718 1719 return *(u32 *)desc.ctx; 1720 } 1721 1722 #ifdef __KERNEL__ 1723 1724 /* hash info structure used by the directory hash */ 1725 struct dx_hash_info 1726 { 1727 u32 hash; 1728 u32 minor_hash; 1729 int hash_version; 1730 u32 *seed; 1731 }; 1732 1733 1734 /* 32 and 64 bit signed EOF for dx directories */ 1735 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 1736 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 1737 1738 1739 /* 1740 * Control parameters used by ext4_htree_next_block 1741 */ 1742 #define HASH_NB_ALWAYS 1 1743 1744 1745 /* 1746 * Describe an inode's exact location on disk and in memory 1747 */ 1748 struct ext4_iloc 1749 { 1750 struct buffer_head *bh; 1751 unsigned long offset; 1752 ext4_group_t block_group; 1753 }; 1754 1755 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 1756 { 1757 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 1758 } 1759 1760 /* 1761 * This structure is stuffed into the struct file's private_data field 1762 * for directories. It is where we put information so that we can do 1763 * readdir operations in hash tree order. 1764 */ 1765 struct dir_private_info { 1766 struct rb_root root; 1767 struct rb_node *curr_node; 1768 struct fname *extra_fname; 1769 loff_t last_pos; 1770 __u32 curr_hash; 1771 __u32 curr_minor_hash; 1772 __u32 next_hash; 1773 }; 1774 1775 /* calculate the first block number of the group */ 1776 static inline ext4_fsblk_t 1777 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 1778 { 1779 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 1780 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 1781 } 1782 1783 /* 1784 * Special error return code only used by dx_probe() and its callers. 1785 */ 1786 #define ERR_BAD_DX_DIR -75000 1787 1788 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, 1789 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); 1790 1791 /* 1792 * Timeout and state flag for lazy initialization inode thread. 1793 */ 1794 #define EXT4_DEF_LI_WAIT_MULT 10 1795 #define EXT4_DEF_LI_MAX_START_DELAY 5 1796 #define EXT4_LAZYINIT_QUIT 0x0001 1797 #define EXT4_LAZYINIT_RUNNING 0x0002 1798 1799 /* 1800 * Lazy inode table initialization info 1801 */ 1802 struct ext4_lazy_init { 1803 unsigned long li_state; 1804 struct list_head li_request_list; 1805 struct mutex li_list_mtx; 1806 }; 1807 1808 struct ext4_li_request { 1809 struct super_block *lr_super; 1810 struct ext4_sb_info *lr_sbi; 1811 ext4_group_t lr_next_group; 1812 struct list_head lr_request; 1813 unsigned long lr_next_sched; 1814 unsigned long lr_timeout; 1815 }; 1816 1817 struct ext4_features { 1818 struct kobject f_kobj; 1819 struct completion f_kobj_unregister; 1820 }; 1821 1822 /* 1823 * This structure will be used for multiple mount protection. It will be 1824 * written into the block number saved in the s_mmp_block field in the 1825 * superblock. Programs that check MMP should assume that if 1826 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 1827 * to use the filesystem, regardless of how old the timestamp is. 1828 */ 1829 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 1830 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 1831 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 1832 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 1833 1834 struct mmp_struct { 1835 __le32 mmp_magic; /* Magic number for MMP */ 1836 __le32 mmp_seq; /* Sequence no. updated periodically */ 1837 1838 /* 1839 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 1840 * purposes and do not affect the correctness of the algorithm 1841 */ 1842 __le64 mmp_time; /* Time last updated */ 1843 char mmp_nodename[64]; /* Node which last updated MMP block */ 1844 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 1845 1846 /* 1847 * mmp_check_interval is used to verify if the MMP block has been 1848 * updated on the block device. The value is updated based on the 1849 * maximum time to write the MMP block during an update cycle. 1850 */ 1851 __le16 mmp_check_interval; 1852 1853 __le16 mmp_pad1; 1854 __le32 mmp_pad2[226]; 1855 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 1856 }; 1857 1858 /* arguments passed to the mmp thread */ 1859 struct mmpd_data { 1860 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 1861 struct super_block *sb; /* super block of the fs */ 1862 }; 1863 1864 /* 1865 * Check interval multiplier 1866 * The MMP block is written every update interval and initially checked every 1867 * update interval x the multiplier (the value is then adapted based on the 1868 * write latency). The reason is that writes can be delayed under load and we 1869 * don't want readers to incorrectly assume that the filesystem is no longer 1870 * in use. 1871 */ 1872 #define EXT4_MMP_CHECK_MULT 2UL 1873 1874 /* 1875 * Minimum interval for MMP checking in seconds. 1876 */ 1877 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 1878 1879 /* 1880 * Maximum interval for MMP checking in seconds. 1881 */ 1882 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 1883 1884 /* 1885 * Function prototypes 1886 */ 1887 1888 /* 1889 * Ok, these declarations are also in <linux/kernel.h> but none of the 1890 * ext4 source programs needs to include it so they are duplicated here. 1891 */ 1892 # define NORET_TYPE /**/ 1893 # define ATTRIB_NORET __attribute__((noreturn)) 1894 # define NORET_AND noreturn, 1895 1896 /* bitmap.c */ 1897 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 1898 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 1899 struct ext4_group_desc *gdp, 1900 struct buffer_head *bh, int sz); 1901 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 1902 struct ext4_group_desc *gdp, 1903 struct buffer_head *bh, int sz); 1904 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 1905 struct ext4_group_desc *gdp, 1906 struct buffer_head *bh); 1907 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 1908 struct ext4_group_desc *gdp, 1909 struct buffer_head *bh); 1910 1911 /* balloc.c */ 1912 extern void ext4_validate_block_bitmap(struct super_block *sb, 1913 struct ext4_group_desc *desc, 1914 unsigned int block_group, 1915 struct buffer_head *bh); 1916 extern unsigned int ext4_block_group(struct super_block *sb, 1917 ext4_fsblk_t blocknr); 1918 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 1919 ext4_fsblk_t blocknr); 1920 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 1921 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 1922 ext4_group_t group); 1923 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 1924 ext4_fsblk_t goal, 1925 unsigned int flags, 1926 unsigned long *count, 1927 int *errp); 1928 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 1929 s64 nclusters, unsigned int flags); 1930 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 1931 extern void ext4_check_blocks_bitmap(struct super_block *); 1932 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 1933 ext4_group_t block_group, 1934 struct buffer_head ** bh); 1935 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1936 1937 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 1938 ext4_group_t block_group); 1939 extern int ext4_wait_block_bitmap(struct super_block *sb, 1940 ext4_group_t block_group, 1941 struct buffer_head *bh); 1942 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 1943 ext4_group_t block_group); 1944 extern void ext4_init_block_bitmap(struct super_block *sb, 1945 struct buffer_head *bh, 1946 ext4_group_t group, 1947 struct ext4_group_desc *desc); 1948 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 1949 ext4_group_t block_group, 1950 struct ext4_group_desc *gdp); 1951 extern unsigned ext4_num_overhead_clusters(struct super_block *sb, 1952 ext4_group_t block_group, 1953 struct ext4_group_desc *gdp); 1954 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 1955 1956 /* dir.c */ 1957 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 1958 struct file *, 1959 struct ext4_dir_entry_2 *, 1960 struct buffer_head *, char *, int, 1961 unsigned int); 1962 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 1963 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 1964 (de), (bh), (buf), (size), (offset))) 1965 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 1966 __u32 minor_hash, 1967 struct ext4_dir_entry_2 *dirent); 1968 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 1969 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 1970 struct buffer_head *bh, 1971 void *buf, int buf_size, 1972 const char *name, int namelen, 1973 struct ext4_dir_entry_2 **dest_de); 1974 void ext4_insert_dentry(struct inode *inode, 1975 struct ext4_dir_entry_2 *de, 1976 int buf_size, 1977 const char *name, int namelen); 1978 static inline void ext4_update_dx_flag(struct inode *inode) 1979 { 1980 if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb, 1981 EXT4_FEATURE_COMPAT_DIR_INDEX)) 1982 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 1983 } 1984 static unsigned char ext4_filetype_table[] = { 1985 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 1986 }; 1987 1988 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 1989 { 1990 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE) || 1991 (filetype >= EXT4_FT_MAX)) 1992 return DT_UNKNOWN; 1993 1994 return ext4_filetype_table[filetype]; 1995 } 1996 1997 /* fsync.c */ 1998 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 1999 extern int ext4_flush_unwritten_io(struct inode *); 2000 2001 /* hash.c */ 2002 extern int ext4fs_dirhash(const char *name, int len, struct 2003 dx_hash_info *hinfo); 2004 2005 /* ialloc.c */ 2006 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2007 const struct qstr *qstr, __u32 goal, 2008 uid_t *owner, int handle_type, 2009 unsigned int line_no, int nblocks); 2010 2011 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \ 2012 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2013 0, 0, 0) 2014 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2015 type, nblocks) \ 2016 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2017 (type), __LINE__, (nblocks)) 2018 2019 2020 extern void ext4_free_inode(handle_t *, struct inode *); 2021 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2022 extern unsigned long ext4_count_free_inodes(struct super_block *); 2023 extern unsigned long ext4_count_dirs(struct super_block *); 2024 extern void ext4_check_inodes_bitmap(struct super_block *); 2025 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2026 extern int ext4_init_inode_table(struct super_block *sb, 2027 ext4_group_t group, int barrier); 2028 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2029 2030 /* mballoc.c */ 2031 extern long ext4_mb_stats; 2032 extern long ext4_mb_max_to_scan; 2033 extern int ext4_mb_init(struct super_block *); 2034 extern int ext4_mb_release(struct super_block *); 2035 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2036 struct ext4_allocation_request *, int *); 2037 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2038 extern void ext4_discard_preallocations(struct inode *); 2039 extern int __init ext4_init_mballoc(void); 2040 extern void ext4_exit_mballoc(void); 2041 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2042 struct buffer_head *bh, ext4_fsblk_t block, 2043 unsigned long count, int flags); 2044 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2045 ext4_group_t ngroups); 2046 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2047 ext4_group_t i, struct ext4_group_desc *desc); 2048 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2049 ext4_fsblk_t block, unsigned long count); 2050 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2051 2052 /* inode.c */ 2053 struct buffer_head *ext4_getblk(handle_t *, struct inode *, 2054 ext4_lblk_t, int, int *); 2055 struct buffer_head *ext4_bread(handle_t *, struct inode *, 2056 ext4_lblk_t, int, int *); 2057 int ext4_get_block_write(struct inode *inode, sector_t iblock, 2058 struct buffer_head *bh_result, int create); 2059 int ext4_get_block(struct inode *inode, sector_t iblock, 2060 struct buffer_head *bh_result, int create); 2061 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2062 struct buffer_head *bh, int create); 2063 int ext4_walk_page_buffers(handle_t *handle, 2064 struct buffer_head *head, 2065 unsigned from, 2066 unsigned to, 2067 int *partial, 2068 int (*fn)(handle_t *handle, 2069 struct buffer_head *bh)); 2070 int do_journal_get_write_access(handle_t *handle, 2071 struct buffer_head *bh); 2072 #define FALL_BACK_TO_NONDELALLOC 1 2073 #define CONVERT_INLINE_DATA 2 2074 2075 extern struct inode *ext4_iget(struct super_block *, unsigned long); 2076 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2077 extern int ext4_setattr(struct dentry *, struct iattr *); 2078 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 2079 struct kstat *stat); 2080 extern void ext4_evict_inode(struct inode *); 2081 extern void ext4_clear_inode(struct inode *); 2082 extern int ext4_sync_inode(handle_t *, struct inode *); 2083 extern void ext4_dirty_inode(struct inode *, int); 2084 extern int ext4_change_inode_journal_flag(struct inode *, int); 2085 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2086 extern int ext4_can_truncate(struct inode *inode); 2087 extern void ext4_truncate(struct inode *); 2088 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length); 2089 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 2090 extern void ext4_set_inode_flags(struct inode *); 2091 extern void ext4_get_inode_flags(struct ext4_inode_info *); 2092 extern int ext4_alloc_da_blocks(struct inode *inode); 2093 extern void ext4_set_aops(struct inode *inode); 2094 extern int ext4_writepage_trans_blocks(struct inode *); 2095 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2096 extern int ext4_discard_partial_page_buffers(handle_t *handle, 2097 struct address_space *mapping, loff_t from, 2098 loff_t length, int flags); 2099 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 2100 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2101 extern void ext4_da_update_reserve_space(struct inode *inode, 2102 int used, int quota_claim); 2103 2104 /* indirect.c */ 2105 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2106 struct ext4_map_blocks *map, int flags); 2107 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb, 2108 const struct iovec *iov, loff_t offset, 2109 unsigned long nr_segs); 2110 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2111 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk); 2112 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2113 extern int ext4_free_hole_blocks(handle_t *handle, struct inode *inode, 2114 ext4_lblk_t first, ext4_lblk_t stop); 2115 2116 /* ioctl.c */ 2117 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2118 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2119 2120 /* migrate.c */ 2121 extern int ext4_ext_migrate(struct inode *); 2122 2123 /* namei.c */ 2124 extern int ext4_dirent_csum_verify(struct inode *inode, 2125 struct ext4_dir_entry *dirent); 2126 extern int ext4_orphan_add(handle_t *, struct inode *); 2127 extern int ext4_orphan_del(handle_t *, struct inode *); 2128 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2129 __u32 start_minor_hash, __u32 *next_hash); 2130 extern int search_dir(struct buffer_head *bh, 2131 char *search_buf, 2132 int buf_size, 2133 struct inode *dir, 2134 const struct qstr *d_name, 2135 unsigned int offset, 2136 struct ext4_dir_entry_2 **res_dir); 2137 extern int ext4_generic_delete_entry(handle_t *handle, 2138 struct inode *dir, 2139 struct ext4_dir_entry_2 *de_del, 2140 struct buffer_head *bh, 2141 void *entry_buf, 2142 int buf_size, 2143 int csum_size); 2144 2145 /* resize.c */ 2146 extern int ext4_group_add(struct super_block *sb, 2147 struct ext4_new_group_data *input); 2148 extern int ext4_group_extend(struct super_block *sb, 2149 struct ext4_super_block *es, 2150 ext4_fsblk_t n_blocks_count); 2151 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2152 2153 /* super.c */ 2154 extern int ext4_calculate_overhead(struct super_block *sb); 2155 extern int ext4_superblock_csum_verify(struct super_block *sb, 2156 struct ext4_super_block *es); 2157 extern void ext4_superblock_csum_set(struct super_block *sb); 2158 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 2159 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 2160 extern void ext4_kvfree(void *ptr); 2161 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2162 ext4_group_t ngroup); 2163 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2164 char nbuf[16]); 2165 extern __printf(4, 5) 2166 void __ext4_error(struct super_block *, const char *, unsigned int, 2167 const char *, ...); 2168 #define ext4_error(sb, message...) __ext4_error(sb, __func__, \ 2169 __LINE__, ## message) 2170 extern __printf(5, 6) 2171 void ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2172 const char *, ...); 2173 extern __printf(5, 6) 2174 void ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2175 const char *, ...); 2176 extern void __ext4_std_error(struct super_block *, const char *, 2177 unsigned int, int); 2178 extern __printf(4, 5) 2179 void __ext4_abort(struct super_block *, const char *, unsigned int, 2180 const char *, ...); 2181 #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \ 2182 __LINE__, ## message) 2183 extern __printf(4, 5) 2184 void __ext4_warning(struct super_block *, const char *, unsigned int, 2185 const char *, ...); 2186 #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \ 2187 __LINE__, ## message) 2188 extern __printf(3, 4) 2189 void ext4_msg(struct super_block *, const char *, const char *, ...); 2190 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2191 const char *, unsigned int, const char *); 2192 #define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \ 2193 __LINE__, msg) 2194 extern __printf(7, 8) 2195 void __ext4_grp_locked_error(const char *, unsigned int, 2196 struct super_block *, ext4_group_t, 2197 unsigned long, ext4_fsblk_t, 2198 const char *, ...); 2199 #define ext4_grp_locked_error(sb, grp, message...) \ 2200 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message) 2201 extern void ext4_update_dynamic_rev(struct super_block *sb); 2202 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2203 __u32 compat); 2204 extern int ext4_update_rocompat_feature(handle_t *handle, 2205 struct super_block *sb, __u32 rocompat); 2206 extern int ext4_update_incompat_feature(handle_t *handle, 2207 struct super_block *sb, __u32 incompat); 2208 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2209 struct ext4_group_desc *bg); 2210 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2211 struct ext4_group_desc *bg); 2212 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2213 struct ext4_group_desc *bg); 2214 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2215 struct ext4_group_desc *bg); 2216 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2217 struct ext4_group_desc *bg); 2218 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2219 struct ext4_group_desc *bg); 2220 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2221 struct ext4_group_desc *bg); 2222 extern void ext4_block_bitmap_set(struct super_block *sb, 2223 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2224 extern void ext4_inode_bitmap_set(struct super_block *sb, 2225 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2226 extern void ext4_inode_table_set(struct super_block *sb, 2227 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2228 extern void ext4_free_group_clusters_set(struct super_block *sb, 2229 struct ext4_group_desc *bg, 2230 __u32 count); 2231 extern void ext4_free_inodes_set(struct super_block *sb, 2232 struct ext4_group_desc *bg, __u32 count); 2233 extern void ext4_used_dirs_set(struct super_block *sb, 2234 struct ext4_group_desc *bg, __u32 count); 2235 extern void ext4_itable_unused_set(struct super_block *sb, 2236 struct ext4_group_desc *bg, __u32 count); 2237 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2238 struct ext4_group_desc *gdp); 2239 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2240 struct ext4_group_desc *gdp); 2241 extern int ext4_register_li_request(struct super_block *sb, 2242 ext4_group_t first_not_zeroed); 2243 2244 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2245 { 2246 return EXT4_HAS_RO_COMPAT_FEATURE(sb, 2247 EXT4_FEATURE_RO_COMPAT_GDT_CSUM | 2248 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM); 2249 } 2250 2251 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2252 { 2253 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2254 le32_to_cpu(es->s_blocks_count_lo); 2255 } 2256 2257 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2258 { 2259 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2260 le32_to_cpu(es->s_r_blocks_count_lo); 2261 } 2262 2263 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2264 { 2265 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2266 le32_to_cpu(es->s_free_blocks_count_lo); 2267 } 2268 2269 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2270 ext4_fsblk_t blk) 2271 { 2272 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2273 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2274 } 2275 2276 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2277 ext4_fsblk_t blk) 2278 { 2279 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2280 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2281 } 2282 2283 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2284 ext4_fsblk_t blk) 2285 { 2286 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2287 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2288 } 2289 2290 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 2291 { 2292 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2293 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2294 le32_to_cpu(raw_inode->i_size_lo); 2295 else 2296 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2297 } 2298 2299 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2300 { 2301 raw_inode->i_size_lo = cpu_to_le32(i_size); 2302 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2303 } 2304 2305 static inline 2306 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2307 ext4_group_t group) 2308 { 2309 struct ext4_group_info ***grp_info; 2310 long indexv, indexh; 2311 grp_info = EXT4_SB(sb)->s_group_info; 2312 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2313 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2314 return grp_info[indexv][indexh]; 2315 } 2316 2317 /* 2318 * Reading s_groups_count requires using smp_rmb() afterwards. See 2319 * the locking protocol documented in the comments of ext4_group_add() 2320 * in resize.c 2321 */ 2322 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2323 { 2324 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2325 2326 smp_rmb(); 2327 return ngroups; 2328 } 2329 2330 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2331 ext4_group_t block_group) 2332 { 2333 return block_group >> sbi->s_log_groups_per_flex; 2334 } 2335 2336 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2337 { 2338 return 1 << sbi->s_log_groups_per_flex; 2339 } 2340 2341 #define ext4_std_error(sb, errno) \ 2342 do { \ 2343 if ((errno)) \ 2344 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2345 } while (0) 2346 2347 #ifdef CONFIG_SMP 2348 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2349 * counters. So we need to make sure we have free clusters more 2350 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2351 */ 2352 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2353 #else 2354 #define EXT4_FREECLUSTERS_WATERMARK 0 2355 #endif 2356 2357 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2358 { 2359 /* 2360 * XXX: replace with spinlock if seen contended -bzzz 2361 */ 2362 down_write(&EXT4_I(inode)->i_data_sem); 2363 if (newsize > EXT4_I(inode)->i_disksize) 2364 EXT4_I(inode)->i_disksize = newsize; 2365 up_write(&EXT4_I(inode)->i_data_sem); 2366 return ; 2367 } 2368 2369 struct ext4_group_info { 2370 unsigned long bb_state; 2371 struct rb_root bb_free_root; 2372 ext4_grpblk_t bb_first_free; /* first free block */ 2373 ext4_grpblk_t bb_free; /* total free blocks */ 2374 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 2375 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 2376 struct list_head bb_prealloc_list; 2377 #ifdef DOUBLE_CHECK 2378 void *bb_bitmap; 2379 #endif 2380 struct rw_semaphore alloc_sem; 2381 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2382 * regions, index is order. 2383 * bb_counters[3] = 5 means 2384 * 5 free 8-block regions. */ 2385 }; 2386 2387 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 2388 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 2389 2390 #define EXT4_MB_GRP_NEED_INIT(grp) \ 2391 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 2392 2393 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 2394 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2395 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 2396 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2397 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 2398 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2399 2400 #define EXT4_MAX_CONTENTION 8 2401 #define EXT4_CONTENTION_THRESHOLD 2 2402 2403 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2404 ext4_group_t group) 2405 { 2406 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2407 } 2408 2409 /* 2410 * Returns true if the filesystem is busy enough that attempts to 2411 * access the block group locks has run into contention. 2412 */ 2413 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 2414 { 2415 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 2416 } 2417 2418 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 2419 { 2420 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 2421 if (spin_trylock(lock)) 2422 /* 2423 * We're able to grab the lock right away, so drop the 2424 * lock contention counter. 2425 */ 2426 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 2427 else { 2428 /* 2429 * The lock is busy, so bump the contention counter, 2430 * and then wait on the spin lock. 2431 */ 2432 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 2433 EXT4_MAX_CONTENTION); 2434 spin_lock(lock); 2435 } 2436 } 2437 2438 static inline void ext4_unlock_group(struct super_block *sb, 2439 ext4_group_t group) 2440 { 2441 spin_unlock(ext4_group_lock_ptr(sb, group)); 2442 } 2443 2444 /* 2445 * Block validity checking 2446 */ 2447 #define ext4_check_indirect_blockref(inode, bh) \ 2448 ext4_check_blockref(__func__, __LINE__, inode, \ 2449 (__le32 *)(bh)->b_data, \ 2450 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 2451 2452 #define ext4_ind_check_inode(inode) \ 2453 ext4_check_blockref(__func__, __LINE__, inode, \ 2454 EXT4_I(inode)->i_data, \ 2455 EXT4_NDIR_BLOCKS) 2456 2457 /* 2458 * Inodes and files operations 2459 */ 2460 2461 /* dir.c */ 2462 extern const struct file_operations ext4_dir_operations; 2463 2464 /* file.c */ 2465 extern const struct inode_operations ext4_file_inode_operations; 2466 extern const struct file_operations ext4_file_operations; 2467 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 2468 extern void ext4_unwritten_wait(struct inode *inode); 2469 2470 /* inline.c */ 2471 extern int ext4_has_inline_data(struct inode *inode); 2472 extern int ext4_get_inline_size(struct inode *inode); 2473 extern int ext4_get_max_inline_size(struct inode *inode); 2474 extern int ext4_find_inline_data_nolock(struct inode *inode); 2475 extern void ext4_write_inline_data(struct inode *inode, 2476 struct ext4_iloc *iloc, 2477 void *buffer, loff_t pos, 2478 unsigned int len); 2479 extern int ext4_prepare_inline_data(handle_t *handle, struct inode *inode, 2480 unsigned int len); 2481 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 2482 unsigned int len); 2483 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 2484 2485 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 2486 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 2487 struct inode *inode, 2488 loff_t pos, unsigned len, 2489 unsigned flags, 2490 struct page **pagep); 2491 extern int ext4_write_inline_data_end(struct inode *inode, 2492 loff_t pos, unsigned len, 2493 unsigned copied, 2494 struct page *page); 2495 extern struct buffer_head * 2496 ext4_journalled_write_inline_data(struct inode *inode, 2497 unsigned len, 2498 struct page *page); 2499 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 2500 struct inode *inode, 2501 loff_t pos, unsigned len, 2502 unsigned flags, 2503 struct page **pagep, 2504 void **fsdata); 2505 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 2506 unsigned len, unsigned copied, 2507 struct page *page); 2508 extern int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry, 2509 struct inode *inode); 2510 extern int ext4_try_create_inline_dir(handle_t *handle, 2511 struct inode *parent, 2512 struct inode *inode); 2513 extern int ext4_read_inline_dir(struct file *filp, 2514 void *dirent, filldir_t filldir, 2515 int *has_inline_data); 2516 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 2517 const struct qstr *d_name, 2518 struct ext4_dir_entry_2 **res_dir, 2519 int *has_inline_data); 2520 extern int ext4_delete_inline_entry(handle_t *handle, 2521 struct inode *dir, 2522 struct ext4_dir_entry_2 *de_del, 2523 struct buffer_head *bh, 2524 int *has_inline_data); 2525 extern int empty_inline_dir(struct inode *dir, int *has_inline_data); 2526 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 2527 struct ext4_dir_entry_2 **parent_de, 2528 int *retval); 2529 extern int ext4_inline_data_fiemap(struct inode *inode, 2530 struct fiemap_extent_info *fieinfo, 2531 int *has_inline); 2532 extern int ext4_try_to_evict_inline_data(handle_t *handle, 2533 struct inode *inode, 2534 int needed); 2535 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline); 2536 2537 extern int ext4_convert_inline_data(struct inode *inode); 2538 2539 /* namei.c */ 2540 extern const struct inode_operations ext4_dir_inode_operations; 2541 extern const struct inode_operations ext4_special_inode_operations; 2542 extern struct dentry *ext4_get_parent(struct dentry *child); 2543 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 2544 struct ext4_dir_entry_2 *de, 2545 int blocksize, int csum_size, 2546 unsigned int parent_ino, int dotdot_real_len); 2547 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t, 2548 unsigned int blocksize); 2549 extern int ext4_handle_dirty_dirent_node(handle_t *handle, 2550 struct inode *inode, 2551 struct buffer_head *bh); 2552 2553 /* symlink.c */ 2554 extern const struct inode_operations ext4_symlink_inode_operations; 2555 extern const struct inode_operations ext4_fast_symlink_inode_operations; 2556 2557 /* block_validity */ 2558 extern void ext4_release_system_zone(struct super_block *sb); 2559 extern int ext4_setup_system_zone(struct super_block *sb); 2560 extern int __init ext4_init_system_zone(void); 2561 extern void ext4_exit_system_zone(void); 2562 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 2563 ext4_fsblk_t start_blk, 2564 unsigned int count); 2565 extern int ext4_check_blockref(const char *, unsigned int, 2566 struct inode *, __le32 *, unsigned int); 2567 2568 /* extents.c */ 2569 struct ext4_ext_path; 2570 struct ext4_extent; 2571 2572 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 2573 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 2574 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, 2575 int chunk); 2576 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 2577 struct ext4_map_blocks *map, int flags); 2578 extern void ext4_ext_truncate(handle_t *, struct inode *); 2579 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 2580 ext4_lblk_t end); 2581 extern void ext4_ext_init(struct super_block *); 2582 extern void ext4_ext_release(struct super_block *); 2583 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 2584 loff_t len); 2585 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset, 2586 ssize_t len); 2587 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 2588 struct ext4_map_blocks *map, int flags); 2589 extern int ext4_ext_calc_metadata_amount(struct inode *inode, 2590 ext4_lblk_t lblocks); 2591 extern int ext4_extent_tree_init(handle_t *, struct inode *); 2592 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 2593 int num, 2594 struct ext4_ext_path *path); 2595 extern int ext4_can_extents_be_merged(struct inode *inode, 2596 struct ext4_extent *ex1, 2597 struct ext4_extent *ex2); 2598 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 2599 struct ext4_ext_path *, 2600 struct ext4_extent *, int); 2601 extern struct ext4_ext_path *ext4_ext_find_extent(struct inode *, ext4_lblk_t, 2602 struct ext4_ext_path *); 2603 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 2604 extern int ext4_ext_check_inode(struct inode *inode); 2605 extern int ext4_find_delalloc_range(struct inode *inode, 2606 ext4_lblk_t lblk_start, 2607 ext4_lblk_t lblk_end); 2608 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk); 2609 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2610 __u64 start, __u64 len); 2611 extern int ext4_ind_migrate(struct inode *inode); 2612 2613 2614 /* move_extent.c */ 2615 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 2616 __u64 start_orig, __u64 start_donor, 2617 __u64 len, __u64 *moved_len); 2618 2619 /* page-io.c */ 2620 extern int __init ext4_init_pageio(void); 2621 extern void ext4_add_complete_io(ext4_io_end_t *io_end); 2622 extern void ext4_exit_pageio(void); 2623 extern void ext4_ioend_shutdown(struct inode *); 2624 extern void ext4_free_io_end(ext4_io_end_t *io); 2625 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 2626 extern void ext4_end_io_work(struct work_struct *work); 2627 extern void ext4_io_submit(struct ext4_io_submit *io); 2628 extern int ext4_bio_write_page(struct ext4_io_submit *io, 2629 struct page *page, 2630 int len, 2631 struct writeback_control *wbc); 2632 2633 /* mmp.c */ 2634 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 2635 extern void ext4_mmp_csum_set(struct super_block *sb, struct mmp_struct *mmp); 2636 extern int ext4_mmp_csum_verify(struct super_block *sb, 2637 struct mmp_struct *mmp); 2638 2639 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */ 2640 enum ext4_state_bits { 2641 BH_Uninit /* blocks are allocated but uninitialized on disk */ 2642 = BH_JBDPrivateStart, 2643 BH_AllocFromCluster, /* allocated blocks were part of already 2644 * allocated cluster. Note that this flag will 2645 * never, ever appear in a buffer_head's state 2646 * flag. See EXT4_MAP_FROM_CLUSTER to see where 2647 * this is used. */ 2648 }; 2649 2650 BUFFER_FNS(Uninit, uninit) 2651 TAS_BUFFER_FNS(Uninit, uninit) 2652 2653 /* 2654 * Add new method to test whether block and inode bitmaps are properly 2655 * initialized. With uninit_bg reading the block from disk is not enough 2656 * to mark the bitmap uptodate. We need to also zero-out the bitmap 2657 */ 2658 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 2659 2660 static inline int bitmap_uptodate(struct buffer_head *bh) 2661 { 2662 return (buffer_uptodate(bh) && 2663 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 2664 } 2665 static inline void set_bitmap_uptodate(struct buffer_head *bh) 2666 { 2667 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 2668 } 2669 2670 /* 2671 * Disable DIO read nolock optimization, so new dioreaders will be forced 2672 * to grab i_mutex 2673 */ 2674 static inline void ext4_inode_block_unlocked_dio(struct inode *inode) 2675 { 2676 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 2677 smp_mb(); 2678 } 2679 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode) 2680 { 2681 smp_mb(); 2682 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 2683 } 2684 2685 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 2686 2687 /* For ioend & aio unwritten conversion wait queues */ 2688 #define EXT4_WQ_HASH_SZ 37 2689 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 2690 EXT4_WQ_HASH_SZ]) 2691 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\ 2692 EXT4_WQ_HASH_SZ]) 2693 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 2694 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; 2695 2696 #define EXT4_RESIZING 0 2697 extern int ext4_resize_begin(struct super_block *sb); 2698 extern void ext4_resize_end(struct super_block *sb); 2699 2700 #endif /* __KERNEL__ */ 2701 2702 #endif /* _EXT4_H */ 2703