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 <linux/ratelimit.h> 33 #include <crypto/hash.h> 34 #include <linux/falloc.h> 35 #ifdef __KERNEL__ 36 #include <linux/compat.h> 37 #endif 38 39 /* 40 * The fourth extended filesystem constants/structures 41 */ 42 43 /* 44 * Define EXT4FS_DEBUG to produce debug messages 45 */ 46 #undef EXT4FS_DEBUG 47 48 /* 49 * Debug code 50 */ 51 #ifdef EXT4FS_DEBUG 52 #define ext4_debug(f, a...) \ 53 do { \ 54 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 55 __FILE__, __LINE__, __func__); \ 56 printk(KERN_DEBUG f, ## a); \ 57 } while (0) 58 #else 59 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 60 #endif 61 62 /* 63 * Turn on EXT_DEBUG to get lots of info about extents operations. 64 */ 65 #define EXT_DEBUG__ 66 #ifdef EXT_DEBUG 67 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__) 68 #else 69 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 70 #endif 71 72 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 73 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 74 75 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 76 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 77 78 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 79 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 80 81 /* data type for block offset of block group */ 82 typedef int ext4_grpblk_t; 83 84 /* data type for filesystem-wide blocks number */ 85 typedef unsigned long long ext4_fsblk_t; 86 87 /* data type for file logical block number */ 88 typedef __u32 ext4_lblk_t; 89 90 /* data type for block group number */ 91 typedef unsigned int ext4_group_t; 92 93 /* 94 * Flags used in mballoc's allocation_context flags field. 95 * 96 * Also used to show what's going on for debugging purposes when the 97 * flag field is exported via the traceport interface 98 */ 99 100 /* prefer goal again. length */ 101 #define EXT4_MB_HINT_MERGE 0x0001 102 /* blocks already reserved */ 103 #define EXT4_MB_HINT_RESERVED 0x0002 104 /* metadata is being allocated */ 105 #define EXT4_MB_HINT_METADATA 0x0004 106 /* first blocks in the file */ 107 #define EXT4_MB_HINT_FIRST 0x0008 108 /* search for the best chunk */ 109 #define EXT4_MB_HINT_BEST 0x0010 110 /* data is being allocated */ 111 #define EXT4_MB_HINT_DATA 0x0020 112 /* don't preallocate (for tails) */ 113 #define EXT4_MB_HINT_NOPREALLOC 0x0040 114 /* allocate for locality group */ 115 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 116 /* allocate goal blocks or none */ 117 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 118 /* goal is meaningful */ 119 #define EXT4_MB_HINT_TRY_GOAL 0x0200 120 /* blocks already pre-reserved by delayed allocation */ 121 #define EXT4_MB_DELALLOC_RESERVED 0x0400 122 /* We are doing stream allocation */ 123 #define EXT4_MB_STREAM_ALLOC 0x0800 124 /* Use reserved root blocks if needed */ 125 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 126 /* Use blocks from reserved pool */ 127 #define EXT4_MB_USE_RESERVED 0x2000 128 129 struct ext4_allocation_request { 130 /* target inode for block we're allocating */ 131 struct inode *inode; 132 /* how many blocks we want to allocate */ 133 unsigned int len; 134 /* logical block in target inode */ 135 ext4_lblk_t logical; 136 /* the closest logical allocated block to the left */ 137 ext4_lblk_t lleft; 138 /* the closest logical allocated block to the right */ 139 ext4_lblk_t lright; 140 /* phys. target (a hint) */ 141 ext4_fsblk_t goal; 142 /* phys. block for the closest logical allocated block to the left */ 143 ext4_fsblk_t pleft; 144 /* phys. block for the closest logical allocated block to the right */ 145 ext4_fsblk_t pright; 146 /* flags. see above EXT4_MB_HINT_* */ 147 unsigned int flags; 148 }; 149 150 /* 151 * Logical to physical block mapping, used by ext4_map_blocks() 152 * 153 * This structure is used to pass requests into ext4_map_blocks() as 154 * well as to store the information returned by ext4_map_blocks(). It 155 * takes less room on the stack than a struct buffer_head. 156 */ 157 #define EXT4_MAP_NEW (1 << BH_New) 158 #define EXT4_MAP_MAPPED (1 << BH_Mapped) 159 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 160 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 161 /* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of 162 * ext4_map_blocks wants to know whether or not the underlying cluster has 163 * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that 164 * the requested mapping was from previously mapped (or delayed allocated) 165 * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster 166 * should never appear on buffer_head's state flags. 167 */ 168 #define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster) 169 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 170 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\ 171 EXT4_MAP_FROM_CLUSTER) 172 173 struct ext4_map_blocks { 174 ext4_fsblk_t m_pblk; 175 ext4_lblk_t m_lblk; 176 unsigned int m_len; 177 unsigned int m_flags; 178 }; 179 180 /* 181 * Flags for ext4_io_end->flags 182 */ 183 #define EXT4_IO_END_UNWRITTEN 0x0001 184 185 /* 186 * For converting uninitialized extents on a work queue. 'handle' is used for 187 * buffered writeback. 188 */ 189 typedef struct ext4_io_end { 190 struct list_head list; /* per-file finished IO list */ 191 handle_t *handle; /* handle reserved for extent 192 * conversion */ 193 struct inode *inode; /* file being written to */ 194 struct bio *bio; /* Linked list of completed 195 * bios covering the extent */ 196 unsigned int flag; /* unwritten or not */ 197 loff_t offset; /* offset in the file */ 198 ssize_t size; /* size of the extent */ 199 atomic_t count; /* reference counter */ 200 } ext4_io_end_t; 201 202 struct ext4_io_submit { 203 int io_op; 204 struct bio *io_bio; 205 ext4_io_end_t *io_end; 206 sector_t io_next_block; 207 }; 208 209 /* 210 * Special inodes numbers 211 */ 212 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 213 #define EXT4_ROOT_INO 2 /* Root inode */ 214 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 215 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 216 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 217 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 218 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 219 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 220 221 /* First non-reserved inode for old ext4 filesystems */ 222 #define EXT4_GOOD_OLD_FIRST_INO 11 223 224 /* 225 * Maximal count of links to a file 226 */ 227 #define EXT4_LINK_MAX 65000 228 229 /* 230 * Macro-instructions used to manage several block sizes 231 */ 232 #define EXT4_MIN_BLOCK_SIZE 1024 233 #define EXT4_MAX_BLOCK_SIZE 65536 234 #define EXT4_MIN_BLOCK_LOG_SIZE 10 235 #define EXT4_MAX_BLOCK_LOG_SIZE 16 236 #ifdef __KERNEL__ 237 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 238 #else 239 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 240 #endif 241 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 242 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 243 EXT4_SB(s)->s_cluster_bits) 244 #ifdef __KERNEL__ 245 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 246 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 247 #else 248 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 249 #endif 250 #ifdef __KERNEL__ 251 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 252 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 253 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 254 #else 255 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 256 EXT4_GOOD_OLD_INODE_SIZE : \ 257 (s)->s_inode_size) 258 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 259 EXT4_GOOD_OLD_FIRST_INO : \ 260 (s)->s_first_ino) 261 #endif 262 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 263 264 /* Translate a block number to a cluster number */ 265 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 266 /* Translate a cluster number to a block number */ 267 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 268 /* Translate # of blks to # of clusters */ 269 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 270 (sbi)->s_cluster_bits) 271 /* Mask out the low bits to get the starting block of the cluster */ 272 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 273 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 274 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 275 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 276 /* Get the cluster offset */ 277 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 278 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 279 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 280 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 281 282 /* 283 * Structure of a blocks group descriptor 284 */ 285 struct ext4_group_desc 286 { 287 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 288 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 289 __le32 bg_inode_table_lo; /* Inodes table block */ 290 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 291 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 292 __le16 bg_used_dirs_count_lo; /* Directories count */ 293 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 294 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 295 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 296 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 297 __le16 bg_itable_unused_lo; /* Unused inodes count */ 298 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 299 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 300 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 301 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 302 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 303 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 304 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 305 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 306 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 307 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 308 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 309 __u32 bg_reserved; 310 }; 311 312 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 313 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 314 sizeof(__le16)) 315 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 316 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 317 sizeof(__le16)) 318 319 /* 320 * Structure of a flex block group info 321 */ 322 323 struct flex_groups { 324 atomic64_t free_clusters; 325 atomic_t free_inodes; 326 atomic_t used_dirs; 327 }; 328 329 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 330 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 331 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 332 333 /* 334 * Macro-instructions used to manage group descriptors 335 */ 336 #define EXT4_MIN_DESC_SIZE 32 337 #define EXT4_MIN_DESC_SIZE_64BIT 64 338 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 339 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 340 #ifdef __KERNEL__ 341 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 342 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 343 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 344 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 345 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 346 #else 347 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 348 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 349 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 350 #endif 351 352 /* 353 * Constants relative to the data blocks 354 */ 355 #define EXT4_NDIR_BLOCKS 12 356 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 357 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 358 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 359 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 360 361 /* 362 * Inode flags 363 */ 364 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 365 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 366 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 367 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 368 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 369 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 370 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 371 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 372 /* Reserved for compression usage... */ 373 #define EXT4_DIRTY_FL 0x00000100 374 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 375 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 376 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 377 /* End compression flags --- maybe not all used */ 378 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 379 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 380 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 381 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 382 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 383 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 384 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 385 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 386 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 387 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 388 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 389 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 390 391 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 392 #define EXT4_FL_USER_MODIFIABLE 0x004380FF /* User modifiable flags */ 393 394 /* Flags that should be inherited by new inodes from their parent. */ 395 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 396 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 397 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 398 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 399 400 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 401 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 402 403 /* Flags that are appropriate for non-directories/regular files. */ 404 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 405 406 /* Mask out flags that are inappropriate for the given type of inode. */ 407 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 408 { 409 if (S_ISDIR(mode)) 410 return flags; 411 else if (S_ISREG(mode)) 412 return flags & EXT4_REG_FLMASK; 413 else 414 return flags & EXT4_OTHER_FLMASK; 415 } 416 417 /* 418 * Inode flags used for atomic set/get 419 */ 420 enum { 421 EXT4_INODE_SECRM = 0, /* Secure deletion */ 422 EXT4_INODE_UNRM = 1, /* Undelete */ 423 EXT4_INODE_COMPR = 2, /* Compress file */ 424 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 425 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 426 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 427 EXT4_INODE_NODUMP = 6, /* do not dump file */ 428 EXT4_INODE_NOATIME = 7, /* do not update atime */ 429 /* Reserved for compression usage... */ 430 EXT4_INODE_DIRTY = 8, 431 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 432 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 433 EXT4_INODE_ECOMPR = 11, /* Compression error */ 434 /* End compression flags --- maybe not all used */ 435 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 436 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 437 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 438 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 439 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 440 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 441 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 442 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 443 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 444 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 445 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 446 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 447 }; 448 449 /* 450 * Since it's pretty easy to mix up bit numbers and hex values, we use a 451 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 452 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 453 * any extra space in the compiled kernel image, otherwise, the build will fail. 454 * It's important that these values are the same, since we are using 455 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 456 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 457 * values found in ext2, ext3 and ext4 filesystems, and of course the values 458 * defined in e2fsprogs. 459 * 460 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 461 */ 462 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 463 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 464 465 static inline void ext4_check_flag_values(void) 466 { 467 CHECK_FLAG_VALUE(SECRM); 468 CHECK_FLAG_VALUE(UNRM); 469 CHECK_FLAG_VALUE(COMPR); 470 CHECK_FLAG_VALUE(SYNC); 471 CHECK_FLAG_VALUE(IMMUTABLE); 472 CHECK_FLAG_VALUE(APPEND); 473 CHECK_FLAG_VALUE(NODUMP); 474 CHECK_FLAG_VALUE(NOATIME); 475 CHECK_FLAG_VALUE(DIRTY); 476 CHECK_FLAG_VALUE(COMPRBLK); 477 CHECK_FLAG_VALUE(NOCOMPR); 478 CHECK_FLAG_VALUE(ECOMPR); 479 CHECK_FLAG_VALUE(INDEX); 480 CHECK_FLAG_VALUE(IMAGIC); 481 CHECK_FLAG_VALUE(JOURNAL_DATA); 482 CHECK_FLAG_VALUE(NOTAIL); 483 CHECK_FLAG_VALUE(DIRSYNC); 484 CHECK_FLAG_VALUE(TOPDIR); 485 CHECK_FLAG_VALUE(HUGE_FILE); 486 CHECK_FLAG_VALUE(EXTENTS); 487 CHECK_FLAG_VALUE(EA_INODE); 488 CHECK_FLAG_VALUE(EOFBLOCKS); 489 CHECK_FLAG_VALUE(INLINE_DATA); 490 CHECK_FLAG_VALUE(RESERVED); 491 } 492 493 /* Used to pass group descriptor data when online resize is done */ 494 struct ext4_new_group_input { 495 __u32 group; /* Group number for this data */ 496 __u64 block_bitmap; /* Absolute block number of block bitmap */ 497 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 498 __u64 inode_table; /* Absolute block number of inode table start */ 499 __u32 blocks_count; /* Total number of blocks in this group */ 500 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 501 __u16 unused; 502 }; 503 504 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 505 struct compat_ext4_new_group_input { 506 u32 group; 507 compat_u64 block_bitmap; 508 compat_u64 inode_bitmap; 509 compat_u64 inode_table; 510 u32 blocks_count; 511 u16 reserved_blocks; 512 u16 unused; 513 }; 514 #endif 515 516 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 517 struct ext4_new_group_data { 518 __u32 group; 519 __u64 block_bitmap; 520 __u64 inode_bitmap; 521 __u64 inode_table; 522 __u32 blocks_count; 523 __u16 reserved_blocks; 524 __u16 unused; 525 __u32 free_blocks_count; 526 }; 527 528 /* Indexes used to index group tables in ext4_new_group_data */ 529 enum { 530 BLOCK_BITMAP = 0, /* block bitmap */ 531 INODE_BITMAP, /* inode bitmap */ 532 INODE_TABLE, /* inode tables */ 533 GROUP_TABLE_COUNT, 534 }; 535 536 /* 537 * Flags used by ext4_map_blocks() 538 */ 539 /* Allocate any needed blocks and/or convert an unitialized 540 extent to be an initialized ext4 */ 541 #define EXT4_GET_BLOCKS_CREATE 0x0001 542 /* Request the creation of an unitialized extent */ 543 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 544 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ 545 EXT4_GET_BLOCKS_CREATE) 546 /* Caller is from the delayed allocation writeout path 547 * finally doing the actual allocation of delayed blocks */ 548 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 549 /* caller is from the direct IO path, request to creation of an 550 unitialized extents if not allocated, split the uninitialized 551 extent if blocks has been preallocated already*/ 552 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 553 #define EXT4_GET_BLOCKS_CONVERT 0x0010 554 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 555 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 556 /* Convert extent to initialized after IO complete */ 557 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 558 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 559 /* Eventual metadata allocation (due to growing extent tree) 560 * should not fail, so try to use reserved blocks for that.*/ 561 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 562 /* Don't normalize allocation size (used for fallocate) */ 563 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 564 /* Request will not result in inode size update (user for fallocate) */ 565 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 566 /* Do not take i_data_sem locking in ext4_map_blocks */ 567 #define EXT4_GET_BLOCKS_NO_LOCK 0x0100 568 /* Do not put hole in extent cache */ 569 #define EXT4_GET_BLOCKS_NO_PUT_HOLE 0x0200 570 /* Convert written extents to unwritten */ 571 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0400 572 573 /* 574 * The bit position of these flags must not overlap with any of the 575 * EXT4_GET_BLOCKS_*. They are used by ext4_ext_find_extent(), 576 * read_extent_tree_block(), ext4_split_extent_at(), 577 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 578 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 579 * caching the extents when reading from the extent tree while a 580 * truncate or punch hole operation is in progress. 581 */ 582 #define EXT4_EX_NOCACHE 0x0400 583 #define EXT4_EX_FORCE_CACHE 0x0800 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 #define EXT4_FREE_BLOCKS_RESERVE 0x0040 595 596 /* 597 * ioctl commands 598 */ 599 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 600 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 601 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 602 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 603 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 604 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 605 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 606 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 607 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 608 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 609 #define EXT4_IOC_MIGRATE _IO('f', 9) 610 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 611 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 612 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 613 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 614 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 615 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 616 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 617 618 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 619 /* 620 * ioctl commands in 32 bit emulation 621 */ 622 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 623 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 624 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 625 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 626 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 627 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 628 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 629 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 630 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 631 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 632 #endif 633 634 /* Max physical block we can address w/o extents */ 635 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 636 637 /* 638 * Structure of an inode on the disk 639 */ 640 struct ext4_inode { 641 __le16 i_mode; /* File mode */ 642 __le16 i_uid; /* Low 16 bits of Owner Uid */ 643 __le32 i_size_lo; /* Size in bytes */ 644 __le32 i_atime; /* Access time */ 645 __le32 i_ctime; /* Inode Change time */ 646 __le32 i_mtime; /* Modification time */ 647 __le32 i_dtime; /* Deletion Time */ 648 __le16 i_gid; /* Low 16 bits of Group Id */ 649 __le16 i_links_count; /* Links count */ 650 __le32 i_blocks_lo; /* Blocks count */ 651 __le32 i_flags; /* File flags */ 652 union { 653 struct { 654 __le32 l_i_version; 655 } linux1; 656 struct { 657 __u32 h_i_translator; 658 } hurd1; 659 struct { 660 __u32 m_i_reserved1; 661 } masix1; 662 } osd1; /* OS dependent 1 */ 663 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 664 __le32 i_generation; /* File version (for NFS) */ 665 __le32 i_file_acl_lo; /* File ACL */ 666 __le32 i_size_high; 667 __le32 i_obso_faddr; /* Obsoleted fragment address */ 668 union { 669 struct { 670 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 671 __le16 l_i_file_acl_high; 672 __le16 l_i_uid_high; /* these 2 fields */ 673 __le16 l_i_gid_high; /* were reserved2[0] */ 674 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 675 __le16 l_i_reserved; 676 } linux2; 677 struct { 678 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 679 __u16 h_i_mode_high; 680 __u16 h_i_uid_high; 681 __u16 h_i_gid_high; 682 __u32 h_i_author; 683 } hurd2; 684 struct { 685 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 686 __le16 m_i_file_acl_high; 687 __u32 m_i_reserved2[2]; 688 } masix2; 689 } osd2; /* OS dependent 2 */ 690 __le16 i_extra_isize; 691 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 692 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 693 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 694 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 695 __le32 i_crtime; /* File Creation time */ 696 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 697 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 698 }; 699 700 struct move_extent { 701 __u32 reserved; /* should be zero */ 702 __u32 donor_fd; /* donor file descriptor */ 703 __u64 orig_start; /* logical start offset in block for orig */ 704 __u64 donor_start; /* logical start offset in block for donor */ 705 __u64 len; /* block length to be moved */ 706 __u64 moved_len; /* moved block length */ 707 }; 708 709 #define EXT4_EPOCH_BITS 2 710 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 711 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 712 713 /* 714 * Extended fields will fit into an inode if the filesystem was formatted 715 * with large inodes (-I 256 or larger) and there are not currently any EAs 716 * consuming all of the available space. For new inodes we always reserve 717 * enough space for the kernel's known extended fields, but for inodes 718 * created with an old kernel this might not have been the case. None of 719 * the extended inode fields is critical for correct filesystem operation. 720 * This macro checks if a certain field fits in the inode. Note that 721 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 722 */ 723 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 724 ((offsetof(typeof(*ext4_inode), field) + \ 725 sizeof((ext4_inode)->field)) \ 726 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 727 (einode)->i_extra_isize)) \ 728 729 static inline __le32 ext4_encode_extra_time(struct timespec *time) 730 { 731 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 732 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | 733 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); 734 } 735 736 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 737 { 738 if (sizeof(time->tv_sec) > 4) 739 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 740 << 32; 741 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 742 } 743 744 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 745 do { \ 746 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 747 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 748 (raw_inode)->xtime ## _extra = \ 749 ext4_encode_extra_time(&(inode)->xtime); \ 750 } while (0) 751 752 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 753 do { \ 754 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 755 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 756 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 757 (raw_inode)->xtime ## _extra = \ 758 ext4_encode_extra_time(&(einode)->xtime); \ 759 } while (0) 760 761 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 762 do { \ 763 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 764 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 765 ext4_decode_extra_time(&(inode)->xtime, \ 766 raw_inode->xtime ## _extra); \ 767 else \ 768 (inode)->xtime.tv_nsec = 0; \ 769 } while (0) 770 771 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 772 do { \ 773 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 774 (einode)->xtime.tv_sec = \ 775 (signed)le32_to_cpu((raw_inode)->xtime); \ 776 else \ 777 (einode)->xtime.tv_sec = 0; \ 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 unsigned long i_touch_when; /* jiffies of last accessing */ 894 895 /* ialloc */ 896 ext4_group_t i_last_alloc_group; 897 898 /* allocation reservation info for delalloc */ 899 /* In case of bigalloc, these refer to clusters rather than blocks */ 900 unsigned int i_reserved_data_blocks; 901 unsigned int i_reserved_meta_blocks; 902 unsigned int i_allocated_meta_blocks; 903 ext4_lblk_t i_da_metadata_calc_last_lblock; 904 int i_da_metadata_calc_len; 905 906 /* on-disk additional length */ 907 __u16 i_extra_isize; 908 909 /* Indicate the inline data space. */ 910 u16 i_inline_off; 911 u16 i_inline_size; 912 913 #ifdef CONFIG_QUOTA 914 /* quota space reservation, managed internally by quota code */ 915 qsize_t i_reserved_quota; 916 #endif 917 918 /* Lock protecting lists below */ 919 spinlock_t i_completed_io_lock; 920 /* 921 * Completed IOs that need unwritten extents handling and have 922 * transaction reserved 923 */ 924 struct list_head i_rsv_conversion_list; 925 /* 926 * Completed IOs that need unwritten extents handling and don't have 927 * transaction reserved 928 */ 929 atomic_t i_ioend_count; /* Number of outstanding io_end structs */ 930 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 931 struct work_struct i_rsv_conversion_work; 932 933 spinlock_t i_block_reservation_lock; 934 935 /* 936 * Transactions that contain inode's metadata needed to complete 937 * fsync and fdatasync, respectively. 938 */ 939 tid_t i_sync_tid; 940 tid_t i_datasync_tid; 941 942 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 943 __u32 i_csum_seed; 944 }; 945 946 /* 947 * File system states 948 */ 949 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 950 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 951 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 952 953 /* 954 * Misc. filesystem flags 955 */ 956 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 957 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 958 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 959 960 /* 961 * Mount flags set via mount options or defaults 962 */ 963 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 964 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 965 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 966 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 967 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 968 #define EXT4_MOUNT_ERRORS_MASK 0x00070 969 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 970 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 971 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 972 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 973 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 974 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 975 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 976 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 977 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 978 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 979 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 980 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 981 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 982 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 983 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 984 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 985 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 986 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 987 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 988 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 989 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 990 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 991 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 992 993 /* 994 * Mount flags set either automatically (could not be set by mount option) 995 * based on per file system feature or property or in special cases such as 996 * distinguishing between explicit mount option definition and default. 997 */ 998 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 999 specified delalloc */ 1000 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1001 size of blocksize * 8 1002 blocks */ 1003 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1004 file systems */ 1005 1006 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1007 ~EXT4_MOUNT_##opt 1008 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1009 EXT4_MOUNT_##opt 1010 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1011 EXT4_MOUNT_##opt) 1012 1013 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1014 ~EXT4_MOUNT2_##opt 1015 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1016 EXT4_MOUNT2_##opt 1017 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1018 EXT4_MOUNT2_##opt) 1019 1020 #define ext4_test_and_set_bit __test_and_set_bit_le 1021 #define ext4_set_bit __set_bit_le 1022 #define ext4_set_bit_atomic ext2_set_bit_atomic 1023 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1024 #define ext4_clear_bit __clear_bit_le 1025 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1026 #define ext4_test_bit test_bit_le 1027 #define ext4_find_next_zero_bit find_next_zero_bit_le 1028 #define ext4_find_next_bit find_next_bit_le 1029 1030 extern void ext4_set_bits(void *bm, int cur, int len); 1031 1032 /* 1033 * Maximal mount counts between two filesystem checks 1034 */ 1035 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1036 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1037 1038 /* 1039 * Behaviour when detecting errors 1040 */ 1041 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1042 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1043 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1044 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1045 1046 /* Metadata checksum algorithm codes */ 1047 #define EXT4_CRC32C_CHKSUM 1 1048 1049 /* 1050 * Structure of the super block 1051 */ 1052 struct ext4_super_block { 1053 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1054 __le32 s_blocks_count_lo; /* Blocks count */ 1055 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1056 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1057 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1058 __le32 s_first_data_block; /* First Data Block */ 1059 __le32 s_log_block_size; /* Block size */ 1060 __le32 s_log_cluster_size; /* Allocation cluster size */ 1061 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1062 __le32 s_clusters_per_group; /* # Clusters per group */ 1063 __le32 s_inodes_per_group; /* # Inodes per group */ 1064 __le32 s_mtime; /* Mount time */ 1065 /*30*/ __le32 s_wtime; /* Write time */ 1066 __le16 s_mnt_count; /* Mount count */ 1067 __le16 s_max_mnt_count; /* Maximal mount count */ 1068 __le16 s_magic; /* Magic signature */ 1069 __le16 s_state; /* File system state */ 1070 __le16 s_errors; /* Behaviour when detecting errors */ 1071 __le16 s_minor_rev_level; /* minor revision level */ 1072 /*40*/ __le32 s_lastcheck; /* time of last check */ 1073 __le32 s_checkinterval; /* max. time between checks */ 1074 __le32 s_creator_os; /* OS */ 1075 __le32 s_rev_level; /* Revision level */ 1076 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1077 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1078 /* 1079 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1080 * 1081 * Note: the difference between the compatible feature set and 1082 * the incompatible feature set is that if there is a bit set 1083 * in the incompatible feature set that the kernel doesn't 1084 * know about, it should refuse to mount the filesystem. 1085 * 1086 * e2fsck's requirements are more strict; if it doesn't know 1087 * about a feature in either the compatible or incompatible 1088 * feature set, it must abort and not try to meddle with 1089 * things it doesn't understand... 1090 */ 1091 __le32 s_first_ino; /* First non-reserved inode */ 1092 __le16 s_inode_size; /* size of inode structure */ 1093 __le16 s_block_group_nr; /* block group # of this superblock */ 1094 __le32 s_feature_compat; /* compatible feature set */ 1095 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1096 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1097 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1098 /*78*/ char s_volume_name[16]; /* volume name */ 1099 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 1100 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1101 /* 1102 * Performance hints. Directory preallocation should only 1103 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1104 */ 1105 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1106 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1107 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1108 /* 1109 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1110 */ 1111 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1112 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1113 __le32 s_journal_dev; /* device number of journal file */ 1114 __le32 s_last_orphan; /* start of list of inodes to delete */ 1115 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1116 __u8 s_def_hash_version; /* Default hash version to use */ 1117 __u8 s_jnl_backup_type; 1118 __le16 s_desc_size; /* size of group descriptor */ 1119 /*100*/ __le32 s_default_mount_opts; 1120 __le32 s_first_meta_bg; /* First metablock block group */ 1121 __le32 s_mkfs_time; /* When the filesystem was created */ 1122 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1123 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1124 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1125 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1126 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1127 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1128 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1129 __le32 s_flags; /* Miscellaneous flags */ 1130 __le16 s_raid_stride; /* RAID stride */ 1131 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1132 __le64 s_mmp_block; /* Block for multi-mount protection */ 1133 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1134 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1135 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1136 __le16 s_reserved_pad; 1137 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1138 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1139 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1140 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1141 snapshot's future use */ 1142 __le32 s_snapshot_list; /* inode number of the head of the 1143 on-disk snapshot list */ 1144 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1145 __le32 s_error_count; /* number of fs errors */ 1146 __le32 s_first_error_time; /* first time an error happened */ 1147 __le32 s_first_error_ino; /* inode involved in first error */ 1148 __le64 s_first_error_block; /* block involved of first error */ 1149 __u8 s_first_error_func[32]; /* function where the error happened */ 1150 __le32 s_first_error_line; /* line number where error happened */ 1151 __le32 s_last_error_time; /* most recent time of an error */ 1152 __le32 s_last_error_ino; /* inode involved in last error */ 1153 __le32 s_last_error_line; /* line number where error happened */ 1154 __le64 s_last_error_block; /* block involved of last error */ 1155 __u8 s_last_error_func[32]; /* function where the error happened */ 1156 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1157 __u8 s_mount_opts[64]; 1158 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1159 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1160 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1161 __le32 s_reserved[108]; /* Padding to the end of the block */ 1162 __le32 s_checksum; /* crc32c(superblock) */ 1163 }; 1164 1165 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1166 1167 #ifdef __KERNEL__ 1168 1169 /* 1170 * run-time mount flags 1171 */ 1172 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1173 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1174 1175 /* 1176 * fourth extended-fs super-block data in memory 1177 */ 1178 struct ext4_sb_info { 1179 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1180 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1181 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1182 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1183 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1184 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1185 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1186 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1187 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1188 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1189 unsigned long s_overhead; /* # of fs overhead clusters */ 1190 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1191 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1192 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1193 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1194 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1195 struct buffer_head **s_group_desc; 1196 unsigned int s_mount_opt; 1197 unsigned int s_mount_opt2; 1198 unsigned int s_mount_flags; 1199 unsigned int s_def_mount_opt; 1200 ext4_fsblk_t s_sb_block; 1201 atomic64_t s_resv_clusters; 1202 kuid_t s_resuid; 1203 kgid_t s_resgid; 1204 unsigned short s_mount_state; 1205 unsigned short s_pad; 1206 int s_addr_per_block_bits; 1207 int s_desc_per_block_bits; 1208 int s_inode_size; 1209 int s_first_ino; 1210 unsigned int s_inode_readahead_blks; 1211 unsigned int s_inode_goal; 1212 spinlock_t s_next_gen_lock; 1213 u32 s_next_generation; 1214 u32 s_hash_seed[4]; 1215 int s_def_hash_version; 1216 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1217 struct percpu_counter s_freeclusters_counter; 1218 struct percpu_counter s_freeinodes_counter; 1219 struct percpu_counter s_dirs_counter; 1220 struct percpu_counter s_dirtyclusters_counter; 1221 struct blockgroup_lock *s_blockgroup_lock; 1222 struct proc_dir_entry *s_proc; 1223 struct kobject s_kobj; 1224 struct completion s_kobj_unregister; 1225 struct super_block *s_sb; 1226 1227 /* Journaling */ 1228 struct journal_s *s_journal; 1229 struct list_head s_orphan; 1230 struct mutex s_orphan_lock; 1231 unsigned long s_resize_flags; /* Flags indicating if there 1232 is a resizer */ 1233 unsigned long s_commit_interval; 1234 u32 s_max_batch_time; 1235 u32 s_min_batch_time; 1236 struct block_device *journal_bdev; 1237 #ifdef CONFIG_QUOTA 1238 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ 1239 int s_jquota_fmt; /* Format of quota to use */ 1240 #endif 1241 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1242 struct rb_root system_blks; 1243 1244 #ifdef EXTENTS_STATS 1245 /* ext4 extents stats */ 1246 unsigned long s_ext_min; 1247 unsigned long s_ext_max; 1248 unsigned long s_depth_max; 1249 spinlock_t s_ext_stats_lock; 1250 unsigned long s_ext_blocks; 1251 unsigned long s_ext_extents; 1252 #endif 1253 1254 /* for buddy allocator */ 1255 struct ext4_group_info ***s_group_info; 1256 struct inode *s_buddy_cache; 1257 spinlock_t s_md_lock; 1258 unsigned short *s_mb_offsets; 1259 unsigned int *s_mb_maxs; 1260 unsigned int s_group_info_size; 1261 1262 /* tunables */ 1263 unsigned long s_stripe; 1264 unsigned int s_mb_stream_request; 1265 unsigned int s_mb_max_to_scan; 1266 unsigned int s_mb_min_to_scan; 1267 unsigned int s_mb_stats; 1268 unsigned int s_mb_order2_reqs; 1269 unsigned int s_mb_group_prealloc; 1270 unsigned int s_max_dir_size_kb; 1271 /* where last allocation was done - for stream allocation */ 1272 unsigned long s_mb_last_group; 1273 unsigned long s_mb_last_start; 1274 1275 /* stats for buddy allocator */ 1276 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1277 atomic_t s_bal_success; /* we found long enough chunks */ 1278 atomic_t s_bal_allocated; /* in blocks */ 1279 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1280 atomic_t s_bal_goals; /* goal hits */ 1281 atomic_t s_bal_breaks; /* too long searches */ 1282 atomic_t s_bal_2orders; /* 2^order hits */ 1283 spinlock_t s_bal_lock; 1284 unsigned long s_mb_buddies_generated; 1285 unsigned long long s_mb_generation_time; 1286 atomic_t s_mb_lost_chunks; 1287 atomic_t s_mb_preallocated; 1288 atomic_t s_mb_discarded; 1289 atomic_t s_lock_busy; 1290 1291 /* locality groups */ 1292 struct ext4_locality_group __percpu *s_locality_groups; 1293 1294 /* for write statistics */ 1295 unsigned long s_sectors_written_start; 1296 u64 s_kbytes_written; 1297 1298 /* the size of zero-out chunk */ 1299 unsigned int s_extent_max_zeroout_kb; 1300 1301 unsigned int s_log_groups_per_flex; 1302 struct flex_groups *s_flex_groups; 1303 ext4_group_t s_flex_groups_allocated; 1304 1305 /* workqueue for reserved extent conversions (buffered io) */ 1306 struct workqueue_struct *rsv_conversion_wq; 1307 1308 /* timer for periodic error stats printing */ 1309 struct timer_list s_err_report; 1310 1311 /* Lazy inode table initialization info */ 1312 struct ext4_li_request *s_li_request; 1313 /* Wait multiplier for lazy initialization thread */ 1314 unsigned int s_li_wait_mult; 1315 1316 /* Kernel thread for multiple mount protection */ 1317 struct task_struct *s_mmp_tsk; 1318 1319 /* record the last minlen when FITRIM is called. */ 1320 atomic_t s_last_trim_minblks; 1321 1322 /* Reference to checksum algorithm driver via cryptoapi */ 1323 struct crypto_shash *s_chksum_driver; 1324 1325 /* Precomputed FS UUID checksum for seeding other checksums */ 1326 __u32 s_csum_seed; 1327 1328 /* Reclaim extents from extent status tree */ 1329 struct shrinker s_es_shrinker; 1330 struct list_head s_es_lru; 1331 unsigned long s_es_last_sorted; 1332 struct percpu_counter s_extent_cache_cnt; 1333 struct mb_cache *s_mb_cache; 1334 spinlock_t s_es_lru_lock ____cacheline_aligned_in_smp; 1335 1336 /* Ratelimit ext4 messages. */ 1337 struct ratelimit_state s_err_ratelimit_state; 1338 struct ratelimit_state s_warning_ratelimit_state; 1339 struct ratelimit_state s_msg_ratelimit_state; 1340 }; 1341 1342 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1343 { 1344 return sb->s_fs_info; 1345 } 1346 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1347 { 1348 return container_of(inode, struct ext4_inode_info, vfs_inode); 1349 } 1350 1351 static inline struct timespec ext4_current_time(struct inode *inode) 1352 { 1353 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1354 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1355 } 1356 1357 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1358 { 1359 return ino == EXT4_ROOT_INO || 1360 ino == EXT4_USR_QUOTA_INO || 1361 ino == EXT4_GRP_QUOTA_INO || 1362 ino == EXT4_BOOT_LOADER_INO || 1363 ino == EXT4_JOURNAL_INO || 1364 ino == EXT4_RESIZE_INO || 1365 (ino >= EXT4_FIRST_INO(sb) && 1366 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1367 } 1368 1369 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 1370 struct ext4_io_end *io_end) 1371 { 1372 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 1373 io_end->flag |= EXT4_IO_END_UNWRITTEN; 1374 atomic_inc(&EXT4_I(inode)->i_unwritten); 1375 } 1376 } 1377 1378 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode) 1379 { 1380 return inode->i_private; 1381 } 1382 1383 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io) 1384 { 1385 inode->i_private = io; 1386 } 1387 1388 /* 1389 * Inode dynamic state flags 1390 */ 1391 enum { 1392 EXT4_STATE_JDATA, /* journaled data exists */ 1393 EXT4_STATE_NEW, /* inode is newly created */ 1394 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1395 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1396 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1397 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1398 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1399 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1400 EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */ 1401 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read 1402 nolocking */ 1403 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1404 EXT4_STATE_ORDERED_MODE, /* data=ordered mode */ 1405 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1406 }; 1407 1408 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1409 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1410 { \ 1411 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1412 } \ 1413 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1414 { \ 1415 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1416 } \ 1417 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1418 { \ 1419 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1420 } 1421 1422 /* Add these declarations here only so that these functions can be 1423 * found by name. Otherwise, they are very hard to locate. */ 1424 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1425 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1426 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1427 EXT4_INODE_BIT_FNS(flag, flags, 0) 1428 1429 /* Add these declarations here only so that these functions can be 1430 * found by name. Otherwise, they are very hard to locate. */ 1431 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1432 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1433 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1434 #if (BITS_PER_LONG < 64) 1435 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1436 1437 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1438 { 1439 (ei)->i_state_flags = 0; 1440 } 1441 #else 1442 EXT4_INODE_BIT_FNS(state, flags, 32) 1443 1444 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1445 { 1446 /* We depend on the fact that callers will set i_flags */ 1447 } 1448 #endif 1449 #else 1450 /* Assume that user mode programs are passing in an ext4fs superblock, not 1451 * a kernel struct super_block. This will allow us to call the feature-test 1452 * macros from user land. */ 1453 #define EXT4_SB(sb) (sb) 1454 #endif 1455 1456 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1457 1458 /* 1459 * Codes for operating systems 1460 */ 1461 #define EXT4_OS_LINUX 0 1462 #define EXT4_OS_HURD 1 1463 #define EXT4_OS_MASIX 2 1464 #define EXT4_OS_FREEBSD 3 1465 #define EXT4_OS_LITES 4 1466 1467 /* 1468 * Revision levels 1469 */ 1470 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1471 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1472 1473 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1474 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1475 1476 #define EXT4_GOOD_OLD_INODE_SIZE 128 1477 1478 /* 1479 * Feature set definitions 1480 */ 1481 1482 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1483 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1484 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1485 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1486 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1487 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1488 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1489 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1490 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1491 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1492 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1493 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1494 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1495 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1496 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1497 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1498 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1499 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1500 1501 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1502 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1503 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1504 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1505 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1506 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1507 1508 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1509 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1510 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1511 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1512 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1513 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1514 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1515 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1516 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1517 /* 1518 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1519 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1520 * all other data structures' checksums. However, the METADATA_CSUM and 1521 * GDT_CSUM bits are mutually exclusive. 1522 */ 1523 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1524 1525 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1526 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1527 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1528 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1529 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1530 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1531 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1532 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1533 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1534 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1535 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1536 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */ 1537 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1538 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1539 1540 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1541 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1542 EXT4_FEATURE_INCOMPAT_META_BG) 1543 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1544 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1545 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1546 1547 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1548 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1549 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1550 EXT4_FEATURE_INCOMPAT_META_BG) 1551 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1552 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1553 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1554 1555 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 1556 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1557 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1558 EXT4_FEATURE_INCOMPAT_META_BG| \ 1559 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1560 EXT4_FEATURE_INCOMPAT_64BIT| \ 1561 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1562 EXT4_FEATURE_INCOMPAT_MMP | \ 1563 EXT4_FEATURE_INCOMPAT_INLINE_DATA) 1564 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1565 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1566 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1567 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1568 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1569 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1570 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1571 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1572 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1573 EXT4_FEATURE_RO_COMPAT_QUOTA) 1574 1575 /* 1576 * Default values for user and/or group using reserved blocks 1577 */ 1578 #define EXT4_DEF_RESUID 0 1579 #define EXT4_DEF_RESGID 0 1580 1581 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1582 1583 /* 1584 * Default mount options 1585 */ 1586 #define EXT4_DEFM_DEBUG 0x0001 1587 #define EXT4_DEFM_BSDGROUPS 0x0002 1588 #define EXT4_DEFM_XATTR_USER 0x0004 1589 #define EXT4_DEFM_ACL 0x0008 1590 #define EXT4_DEFM_UID16 0x0010 1591 #define EXT4_DEFM_JMODE 0x0060 1592 #define EXT4_DEFM_JMODE_DATA 0x0020 1593 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1594 #define EXT4_DEFM_JMODE_WBACK 0x0060 1595 #define EXT4_DEFM_NOBARRIER 0x0100 1596 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1597 #define EXT4_DEFM_DISCARD 0x0400 1598 #define EXT4_DEFM_NODELALLOC 0x0800 1599 1600 /* 1601 * Default journal batch times 1602 */ 1603 #define EXT4_DEF_MIN_BATCH_TIME 0 1604 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1605 1606 /* 1607 * Minimum number of groups in a flexgroup before we separate out 1608 * directories into the first block group of a flexgroup 1609 */ 1610 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1611 1612 /* 1613 * Structure of a directory entry 1614 */ 1615 #define EXT4_NAME_LEN 255 1616 1617 struct ext4_dir_entry { 1618 __le32 inode; /* Inode number */ 1619 __le16 rec_len; /* Directory entry length */ 1620 __le16 name_len; /* Name length */ 1621 char name[EXT4_NAME_LEN]; /* File name */ 1622 }; 1623 1624 /* 1625 * The new version of the directory entry. Since EXT4 structures are 1626 * stored in intel byte order, and the name_len field could never be 1627 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1628 * file_type field. 1629 */ 1630 struct ext4_dir_entry_2 { 1631 __le32 inode; /* Inode number */ 1632 __le16 rec_len; /* Directory entry length */ 1633 __u8 name_len; /* Name length */ 1634 __u8 file_type; 1635 char name[EXT4_NAME_LEN]; /* File name */ 1636 }; 1637 1638 /* 1639 * This is a bogus directory entry at the end of each leaf block that 1640 * records checksums. 1641 */ 1642 struct ext4_dir_entry_tail { 1643 __le32 det_reserved_zero1; /* Pretend to be unused */ 1644 __le16 det_rec_len; /* 12 */ 1645 __u8 det_reserved_zero2; /* Zero name length */ 1646 __u8 det_reserved_ft; /* 0xDE, fake file type */ 1647 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1648 }; 1649 1650 #define EXT4_DIRENT_TAIL(block, blocksize) \ 1651 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 1652 ((blocksize) - \ 1653 sizeof(struct ext4_dir_entry_tail)))) 1654 1655 /* 1656 * Ext4 directory file types. Only the low 3 bits are used. The 1657 * other bits are reserved for now. 1658 */ 1659 #define EXT4_FT_UNKNOWN 0 1660 #define EXT4_FT_REG_FILE 1 1661 #define EXT4_FT_DIR 2 1662 #define EXT4_FT_CHRDEV 3 1663 #define EXT4_FT_BLKDEV 4 1664 #define EXT4_FT_FIFO 5 1665 #define EXT4_FT_SOCK 6 1666 #define EXT4_FT_SYMLINK 7 1667 1668 #define EXT4_FT_MAX 8 1669 1670 #define EXT4_FT_DIR_CSUM 0xDE 1671 1672 /* 1673 * EXT4_DIR_PAD defines the directory entries boundaries 1674 * 1675 * NOTE: It must be a multiple of 4 1676 */ 1677 #define EXT4_DIR_PAD 4 1678 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1679 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1680 ~EXT4_DIR_ROUND) 1681 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1682 1683 /* 1684 * If we ever get support for fs block sizes > page_size, we'll need 1685 * to remove the #if statements in the next two functions... 1686 */ 1687 static inline unsigned int 1688 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1689 { 1690 unsigned len = le16_to_cpu(dlen); 1691 1692 #if (PAGE_CACHE_SIZE >= 65536) 1693 if (len == EXT4_MAX_REC_LEN || len == 0) 1694 return blocksize; 1695 return (len & 65532) | ((len & 3) << 16); 1696 #else 1697 return len; 1698 #endif 1699 } 1700 1701 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1702 { 1703 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1704 BUG(); 1705 #if (PAGE_CACHE_SIZE >= 65536) 1706 if (len < 65536) 1707 return cpu_to_le16(len); 1708 if (len == blocksize) { 1709 if (blocksize == 65536) 1710 return cpu_to_le16(EXT4_MAX_REC_LEN); 1711 else 1712 return cpu_to_le16(0); 1713 } 1714 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 1715 #else 1716 return cpu_to_le16(len); 1717 #endif 1718 } 1719 1720 /* 1721 * Hash Tree Directory indexing 1722 * (c) Daniel Phillips, 2001 1723 */ 1724 1725 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 1726 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 1727 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 1728 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 1729 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 1730 1731 /* Legal values for the dx_root hash_version field: */ 1732 1733 #define DX_HASH_LEGACY 0 1734 #define DX_HASH_HALF_MD4 1 1735 #define DX_HASH_TEA 2 1736 #define DX_HASH_LEGACY_UNSIGNED 3 1737 #define DX_HASH_HALF_MD4_UNSIGNED 4 1738 #define DX_HASH_TEA_UNSIGNED 5 1739 1740 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 1741 const void *address, unsigned int length) 1742 { 1743 struct { 1744 struct shash_desc shash; 1745 char ctx[4]; 1746 } desc; 1747 int err; 1748 1749 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 1750 1751 desc.shash.tfm = sbi->s_chksum_driver; 1752 desc.shash.flags = 0; 1753 *(u32 *)desc.ctx = crc; 1754 1755 err = crypto_shash_update(&desc.shash, address, length); 1756 BUG_ON(err); 1757 1758 return *(u32 *)desc.ctx; 1759 } 1760 1761 #ifdef __KERNEL__ 1762 1763 /* hash info structure used by the directory hash */ 1764 struct dx_hash_info 1765 { 1766 u32 hash; 1767 u32 minor_hash; 1768 int hash_version; 1769 u32 *seed; 1770 }; 1771 1772 1773 /* 32 and 64 bit signed EOF for dx directories */ 1774 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 1775 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 1776 1777 1778 /* 1779 * Control parameters used by ext4_htree_next_block 1780 */ 1781 #define HASH_NB_ALWAYS 1 1782 1783 1784 /* 1785 * Describe an inode's exact location on disk and in memory 1786 */ 1787 struct ext4_iloc 1788 { 1789 struct buffer_head *bh; 1790 unsigned long offset; 1791 ext4_group_t block_group; 1792 }; 1793 1794 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 1795 { 1796 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 1797 } 1798 1799 /* 1800 * This structure is stuffed into the struct file's private_data field 1801 * for directories. It is where we put information so that we can do 1802 * readdir operations in hash tree order. 1803 */ 1804 struct dir_private_info { 1805 struct rb_root root; 1806 struct rb_node *curr_node; 1807 struct fname *extra_fname; 1808 loff_t last_pos; 1809 __u32 curr_hash; 1810 __u32 curr_minor_hash; 1811 __u32 next_hash; 1812 }; 1813 1814 /* calculate the first block number of the group */ 1815 static inline ext4_fsblk_t 1816 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 1817 { 1818 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 1819 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 1820 } 1821 1822 /* 1823 * Special error return code only used by dx_probe() and its callers. 1824 */ 1825 #define ERR_BAD_DX_DIR -75000 1826 1827 /* 1828 * Timeout and state flag for lazy initialization inode thread. 1829 */ 1830 #define EXT4_DEF_LI_WAIT_MULT 10 1831 #define EXT4_DEF_LI_MAX_START_DELAY 5 1832 #define EXT4_LAZYINIT_QUIT 0x0001 1833 #define EXT4_LAZYINIT_RUNNING 0x0002 1834 1835 /* 1836 * Lazy inode table initialization info 1837 */ 1838 struct ext4_lazy_init { 1839 unsigned long li_state; 1840 struct list_head li_request_list; 1841 struct mutex li_list_mtx; 1842 }; 1843 1844 struct ext4_li_request { 1845 struct super_block *lr_super; 1846 struct ext4_sb_info *lr_sbi; 1847 ext4_group_t lr_next_group; 1848 struct list_head lr_request; 1849 unsigned long lr_next_sched; 1850 unsigned long lr_timeout; 1851 }; 1852 1853 struct ext4_features { 1854 struct kobject f_kobj; 1855 struct completion f_kobj_unregister; 1856 }; 1857 1858 /* 1859 * This structure will be used for multiple mount protection. It will be 1860 * written into the block number saved in the s_mmp_block field in the 1861 * superblock. Programs that check MMP should assume that if 1862 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 1863 * to use the filesystem, regardless of how old the timestamp is. 1864 */ 1865 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 1866 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 1867 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 1868 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 1869 1870 struct mmp_struct { 1871 __le32 mmp_magic; /* Magic number for MMP */ 1872 __le32 mmp_seq; /* Sequence no. updated periodically */ 1873 1874 /* 1875 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 1876 * purposes and do not affect the correctness of the algorithm 1877 */ 1878 __le64 mmp_time; /* Time last updated */ 1879 char mmp_nodename[64]; /* Node which last updated MMP block */ 1880 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 1881 1882 /* 1883 * mmp_check_interval is used to verify if the MMP block has been 1884 * updated on the block device. The value is updated based on the 1885 * maximum time to write the MMP block during an update cycle. 1886 */ 1887 __le16 mmp_check_interval; 1888 1889 __le16 mmp_pad1; 1890 __le32 mmp_pad2[226]; 1891 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 1892 }; 1893 1894 /* arguments passed to the mmp thread */ 1895 struct mmpd_data { 1896 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 1897 struct super_block *sb; /* super block of the fs */ 1898 }; 1899 1900 /* 1901 * Check interval multiplier 1902 * The MMP block is written every update interval and initially checked every 1903 * update interval x the multiplier (the value is then adapted based on the 1904 * write latency). The reason is that writes can be delayed under load and we 1905 * don't want readers to incorrectly assume that the filesystem is no longer 1906 * in use. 1907 */ 1908 #define EXT4_MMP_CHECK_MULT 2UL 1909 1910 /* 1911 * Minimum interval for MMP checking in seconds. 1912 */ 1913 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 1914 1915 /* 1916 * Maximum interval for MMP checking in seconds. 1917 */ 1918 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 1919 1920 /* 1921 * Function prototypes 1922 */ 1923 1924 /* 1925 * Ok, these declarations are also in <linux/kernel.h> but none of the 1926 * ext4 source programs needs to include it so they are duplicated here. 1927 */ 1928 # define NORET_TYPE /**/ 1929 # define ATTRIB_NORET __attribute__((noreturn)) 1930 # define NORET_AND noreturn, 1931 1932 /* bitmap.c */ 1933 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 1934 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 1935 struct ext4_group_desc *gdp, 1936 struct buffer_head *bh, int sz); 1937 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 1938 struct ext4_group_desc *gdp, 1939 struct buffer_head *bh, int sz); 1940 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 1941 struct ext4_group_desc *gdp, 1942 struct buffer_head *bh); 1943 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 1944 struct ext4_group_desc *gdp, 1945 struct buffer_head *bh); 1946 1947 /* balloc.c */ 1948 extern void ext4_get_group_no_and_offset(struct super_block *sb, 1949 ext4_fsblk_t blocknr, 1950 ext4_group_t *blockgrpp, 1951 ext4_grpblk_t *offsetp); 1952 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 1953 ext4_fsblk_t block); 1954 1955 extern void ext4_validate_block_bitmap(struct super_block *sb, 1956 struct ext4_group_desc *desc, 1957 ext4_group_t block_group, 1958 struct buffer_head *bh); 1959 extern unsigned int ext4_block_group(struct super_block *sb, 1960 ext4_fsblk_t blocknr); 1961 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 1962 ext4_fsblk_t blocknr); 1963 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 1964 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 1965 ext4_group_t group); 1966 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 1967 ext4_fsblk_t goal, 1968 unsigned int flags, 1969 unsigned long *count, 1970 int *errp); 1971 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 1972 s64 nclusters, unsigned int flags); 1973 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 1974 extern void ext4_check_blocks_bitmap(struct super_block *); 1975 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 1976 ext4_group_t block_group, 1977 struct buffer_head ** bh); 1978 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1979 1980 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 1981 ext4_group_t block_group); 1982 extern int ext4_wait_block_bitmap(struct super_block *sb, 1983 ext4_group_t block_group, 1984 struct buffer_head *bh); 1985 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 1986 ext4_group_t block_group); 1987 extern void ext4_init_block_bitmap(struct super_block *sb, 1988 struct buffer_head *bh, 1989 ext4_group_t group, 1990 struct ext4_group_desc *desc); 1991 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 1992 ext4_group_t block_group, 1993 struct ext4_group_desc *gdp); 1994 extern unsigned ext4_num_overhead_clusters(struct super_block *sb, 1995 ext4_group_t block_group, 1996 struct ext4_group_desc *gdp); 1997 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 1998 1999 /* dir.c */ 2000 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2001 struct file *, 2002 struct ext4_dir_entry_2 *, 2003 struct buffer_head *, char *, int, 2004 unsigned int); 2005 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2006 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2007 (de), (bh), (buf), (size), (offset))) 2008 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2009 __u32 minor_hash, 2010 struct ext4_dir_entry_2 *dirent); 2011 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2012 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2013 struct buffer_head *bh, 2014 void *buf, int buf_size, 2015 const char *name, int namelen, 2016 struct ext4_dir_entry_2 **dest_de); 2017 void ext4_insert_dentry(struct inode *inode, 2018 struct ext4_dir_entry_2 *de, 2019 int buf_size, 2020 const char *name, int namelen); 2021 static inline void ext4_update_dx_flag(struct inode *inode) 2022 { 2023 if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb, 2024 EXT4_FEATURE_COMPAT_DIR_INDEX)) 2025 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2026 } 2027 static unsigned char ext4_filetype_table[] = { 2028 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2029 }; 2030 2031 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2032 { 2033 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE) || 2034 (filetype >= EXT4_FT_MAX)) 2035 return DT_UNKNOWN; 2036 2037 return ext4_filetype_table[filetype]; 2038 } 2039 2040 /* fsync.c */ 2041 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2042 2043 /* hash.c */ 2044 extern int ext4fs_dirhash(const char *name, int len, struct 2045 dx_hash_info *hinfo); 2046 2047 /* ialloc.c */ 2048 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2049 const struct qstr *qstr, __u32 goal, 2050 uid_t *owner, int handle_type, 2051 unsigned int line_no, int nblocks); 2052 2053 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \ 2054 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2055 0, 0, 0) 2056 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2057 type, nblocks) \ 2058 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2059 (type), __LINE__, (nblocks)) 2060 2061 2062 extern void ext4_free_inode(handle_t *, struct inode *); 2063 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2064 extern unsigned long ext4_count_free_inodes(struct super_block *); 2065 extern unsigned long ext4_count_dirs(struct super_block *); 2066 extern void ext4_check_inodes_bitmap(struct super_block *); 2067 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2068 extern int ext4_init_inode_table(struct super_block *sb, 2069 ext4_group_t group, int barrier); 2070 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2071 2072 /* mballoc.c */ 2073 extern long ext4_mb_stats; 2074 extern long ext4_mb_max_to_scan; 2075 extern int ext4_mb_init(struct super_block *); 2076 extern int ext4_mb_release(struct super_block *); 2077 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2078 struct ext4_allocation_request *, int *); 2079 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2080 extern void ext4_discard_preallocations(struct inode *); 2081 extern int __init ext4_init_mballoc(void); 2082 extern void ext4_exit_mballoc(void); 2083 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2084 struct buffer_head *bh, ext4_fsblk_t block, 2085 unsigned long count, int flags); 2086 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2087 ext4_group_t ngroups); 2088 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2089 ext4_group_t i, struct ext4_group_desc *desc); 2090 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2091 ext4_fsblk_t block, unsigned long count); 2092 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2093 2094 /* inode.c */ 2095 struct buffer_head *ext4_getblk(handle_t *, struct inode *, 2096 ext4_lblk_t, int, int *); 2097 struct buffer_head *ext4_bread(handle_t *, struct inode *, 2098 ext4_lblk_t, int, int *); 2099 int ext4_get_block_write(struct inode *inode, sector_t iblock, 2100 struct buffer_head *bh_result, int create); 2101 int ext4_get_block(struct inode *inode, sector_t iblock, 2102 struct buffer_head *bh_result, int create); 2103 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2104 struct buffer_head *bh, int create); 2105 int ext4_walk_page_buffers(handle_t *handle, 2106 struct buffer_head *head, 2107 unsigned from, 2108 unsigned to, 2109 int *partial, 2110 int (*fn)(handle_t *handle, 2111 struct buffer_head *bh)); 2112 int do_journal_get_write_access(handle_t *handle, 2113 struct buffer_head *bh); 2114 #define FALL_BACK_TO_NONDELALLOC 1 2115 #define CONVERT_INLINE_DATA 2 2116 2117 extern struct inode *ext4_iget(struct super_block *, unsigned long); 2118 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2119 extern int ext4_setattr(struct dentry *, struct iattr *); 2120 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 2121 struct kstat *stat); 2122 extern void ext4_evict_inode(struct inode *); 2123 extern void ext4_clear_inode(struct inode *); 2124 extern int ext4_sync_inode(handle_t *, struct inode *); 2125 extern void ext4_dirty_inode(struct inode *, int); 2126 extern int ext4_change_inode_journal_flag(struct inode *, int); 2127 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2128 extern int ext4_inode_attach_jinode(struct inode *inode); 2129 extern int ext4_can_truncate(struct inode *inode); 2130 extern void ext4_truncate(struct inode *); 2131 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2132 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 2133 extern void ext4_set_inode_flags(struct inode *); 2134 extern void ext4_get_inode_flags(struct ext4_inode_info *); 2135 extern int ext4_alloc_da_blocks(struct inode *inode); 2136 extern void ext4_set_aops(struct inode *inode); 2137 extern int ext4_writepage_trans_blocks(struct inode *); 2138 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2139 extern int ext4_block_truncate_page(handle_t *handle, 2140 struct address_space *mapping, loff_t from); 2141 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2142 loff_t lstart, loff_t lend); 2143 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 2144 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2145 extern void ext4_da_update_reserve_space(struct inode *inode, 2146 int used, int quota_claim); 2147 2148 /* indirect.c */ 2149 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2150 struct ext4_map_blocks *map, int flags); 2151 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb, 2152 const struct iovec *iov, loff_t offset, 2153 unsigned long nr_segs); 2154 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2155 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2156 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2157 extern int ext4_free_hole_blocks(handle_t *handle, struct inode *inode, 2158 ext4_lblk_t first, ext4_lblk_t stop); 2159 2160 /* ioctl.c */ 2161 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2162 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2163 2164 /* migrate.c */ 2165 extern int ext4_ext_migrate(struct inode *); 2166 extern int ext4_ind_migrate(struct inode *inode); 2167 2168 /* namei.c */ 2169 extern int ext4_dirent_csum_verify(struct inode *inode, 2170 struct ext4_dir_entry *dirent); 2171 extern int ext4_orphan_add(handle_t *, struct inode *); 2172 extern int ext4_orphan_del(handle_t *, struct inode *); 2173 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2174 __u32 start_minor_hash, __u32 *next_hash); 2175 extern int search_dir(struct buffer_head *bh, 2176 char *search_buf, 2177 int buf_size, 2178 struct inode *dir, 2179 const struct qstr *d_name, 2180 unsigned int offset, 2181 struct ext4_dir_entry_2 **res_dir); 2182 extern int ext4_generic_delete_entry(handle_t *handle, 2183 struct inode *dir, 2184 struct ext4_dir_entry_2 *de_del, 2185 struct buffer_head *bh, 2186 void *entry_buf, 2187 int buf_size, 2188 int csum_size); 2189 2190 /* resize.c */ 2191 extern int ext4_group_add(struct super_block *sb, 2192 struct ext4_new_group_data *input); 2193 extern int ext4_group_extend(struct super_block *sb, 2194 struct ext4_super_block *es, 2195 ext4_fsblk_t n_blocks_count); 2196 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2197 2198 /* super.c */ 2199 extern int ext4_calculate_overhead(struct super_block *sb); 2200 extern int ext4_superblock_csum_verify(struct super_block *sb, 2201 struct ext4_super_block *es); 2202 extern void ext4_superblock_csum_set(struct super_block *sb); 2203 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 2204 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 2205 extern void ext4_kvfree(void *ptr); 2206 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2207 ext4_group_t ngroup); 2208 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2209 char nbuf[16]); 2210 2211 extern __printf(4, 5) 2212 void __ext4_error(struct super_block *, const char *, unsigned int, 2213 const char *, ...); 2214 extern __printf(5, 6) 2215 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2216 const char *, ...); 2217 extern __printf(5, 6) 2218 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2219 const char *, ...); 2220 extern void __ext4_std_error(struct super_block *, const char *, 2221 unsigned int, int); 2222 extern __printf(4, 5) 2223 void __ext4_abort(struct super_block *, const char *, unsigned int, 2224 const char *, ...); 2225 extern __printf(4, 5) 2226 void __ext4_warning(struct super_block *, const char *, unsigned int, 2227 const char *, ...); 2228 extern __printf(3, 4) 2229 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2230 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2231 const char *, unsigned int, const char *); 2232 extern __printf(7, 8) 2233 void __ext4_grp_locked_error(const char *, unsigned int, 2234 struct super_block *, ext4_group_t, 2235 unsigned long, ext4_fsblk_t, 2236 const char *, ...); 2237 2238 #ifdef CONFIG_PRINTK 2239 2240 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2241 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__) 2242 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2243 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2244 #define ext4_error(sb, fmt, ...) \ 2245 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2246 #define ext4_abort(sb, fmt, ...) \ 2247 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2248 #define ext4_warning(sb, fmt, ...) \ 2249 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2250 #define ext4_msg(sb, level, fmt, ...) \ 2251 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 2252 #define dump_mmp_msg(sb, mmp, msg) \ 2253 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 2254 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2255 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 2256 fmt, ##__VA_ARGS__) 2257 2258 #else 2259 2260 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2261 do { \ 2262 no_printk(fmt, ##__VA_ARGS__); \ 2263 __ext4_error_inode(inode, "", 0, block, " "); \ 2264 } while (0) 2265 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2266 do { \ 2267 no_printk(fmt, ##__VA_ARGS__); \ 2268 __ext4_error_file(file, "", 0, block, " "); \ 2269 } while (0) 2270 #define ext4_error(sb, fmt, ...) \ 2271 do { \ 2272 no_printk(fmt, ##__VA_ARGS__); \ 2273 __ext4_error(sb, "", 0, " "); \ 2274 } while (0) 2275 #define ext4_abort(sb, fmt, ...) \ 2276 do { \ 2277 no_printk(fmt, ##__VA_ARGS__); \ 2278 __ext4_abort(sb, "", 0, " "); \ 2279 } while (0) 2280 #define ext4_warning(sb, fmt, ...) \ 2281 do { \ 2282 no_printk(fmt, ##__VA_ARGS__); \ 2283 __ext4_warning(sb, "", 0, " "); \ 2284 } while (0) 2285 #define ext4_msg(sb, level, fmt, ...) \ 2286 do { \ 2287 no_printk(fmt, ##__VA_ARGS__); \ 2288 __ext4_msg(sb, "", " "); \ 2289 } while (0) 2290 #define dump_mmp_msg(sb, mmp, msg) \ 2291 __dump_mmp_msg(sb, mmp, "", 0, "") 2292 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2293 do { \ 2294 no_printk(fmt, ##__VA_ARGS__); \ 2295 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 2296 } while (0) 2297 2298 #endif 2299 2300 extern void ext4_update_dynamic_rev(struct super_block *sb); 2301 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2302 __u32 compat); 2303 extern int ext4_update_rocompat_feature(handle_t *handle, 2304 struct super_block *sb, __u32 rocompat); 2305 extern int ext4_update_incompat_feature(handle_t *handle, 2306 struct super_block *sb, __u32 incompat); 2307 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2308 struct ext4_group_desc *bg); 2309 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2310 struct ext4_group_desc *bg); 2311 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2312 struct ext4_group_desc *bg); 2313 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2314 struct ext4_group_desc *bg); 2315 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2316 struct ext4_group_desc *bg); 2317 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2318 struct ext4_group_desc *bg); 2319 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2320 struct ext4_group_desc *bg); 2321 extern void ext4_block_bitmap_set(struct super_block *sb, 2322 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2323 extern void ext4_inode_bitmap_set(struct super_block *sb, 2324 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2325 extern void ext4_inode_table_set(struct super_block *sb, 2326 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2327 extern void ext4_free_group_clusters_set(struct super_block *sb, 2328 struct ext4_group_desc *bg, 2329 __u32 count); 2330 extern void ext4_free_inodes_set(struct super_block *sb, 2331 struct ext4_group_desc *bg, __u32 count); 2332 extern void ext4_used_dirs_set(struct super_block *sb, 2333 struct ext4_group_desc *bg, __u32 count); 2334 extern void ext4_itable_unused_set(struct super_block *sb, 2335 struct ext4_group_desc *bg, __u32 count); 2336 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2337 struct ext4_group_desc *gdp); 2338 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2339 struct ext4_group_desc *gdp); 2340 extern int ext4_register_li_request(struct super_block *sb, 2341 ext4_group_t first_not_zeroed); 2342 2343 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2344 { 2345 return EXT4_HAS_RO_COMPAT_FEATURE(sb, 2346 EXT4_FEATURE_RO_COMPAT_GDT_CSUM | 2347 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM); 2348 } 2349 2350 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2351 { 2352 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2353 le32_to_cpu(es->s_blocks_count_lo); 2354 } 2355 2356 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2357 { 2358 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2359 le32_to_cpu(es->s_r_blocks_count_lo); 2360 } 2361 2362 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2363 { 2364 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2365 le32_to_cpu(es->s_free_blocks_count_lo); 2366 } 2367 2368 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2369 ext4_fsblk_t blk) 2370 { 2371 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2372 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2373 } 2374 2375 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2376 ext4_fsblk_t blk) 2377 { 2378 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2379 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2380 } 2381 2382 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2383 ext4_fsblk_t blk) 2384 { 2385 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2386 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2387 } 2388 2389 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 2390 { 2391 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2392 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2393 le32_to_cpu(raw_inode->i_size_lo); 2394 else 2395 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2396 } 2397 2398 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2399 { 2400 raw_inode->i_size_lo = cpu_to_le32(i_size); 2401 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2402 } 2403 2404 static inline 2405 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2406 ext4_group_t group) 2407 { 2408 struct ext4_group_info ***grp_info; 2409 long indexv, indexh; 2410 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 2411 grp_info = EXT4_SB(sb)->s_group_info; 2412 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2413 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2414 return grp_info[indexv][indexh]; 2415 } 2416 2417 /* 2418 * Reading s_groups_count requires using smp_rmb() afterwards. See 2419 * the locking protocol documented in the comments of ext4_group_add() 2420 * in resize.c 2421 */ 2422 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2423 { 2424 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2425 2426 smp_rmb(); 2427 return ngroups; 2428 } 2429 2430 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2431 ext4_group_t block_group) 2432 { 2433 return block_group >> sbi->s_log_groups_per_flex; 2434 } 2435 2436 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2437 { 2438 return 1 << sbi->s_log_groups_per_flex; 2439 } 2440 2441 #define ext4_std_error(sb, errno) \ 2442 do { \ 2443 if ((errno)) \ 2444 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2445 } while (0) 2446 2447 #ifdef CONFIG_SMP 2448 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2449 * counters. So we need to make sure we have free clusters more 2450 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2451 */ 2452 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2453 #else 2454 #define EXT4_FREECLUSTERS_WATERMARK 0 2455 #endif 2456 2457 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 2458 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2459 { 2460 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 2461 !mutex_is_locked(&inode->i_mutex)); 2462 down_write(&EXT4_I(inode)->i_data_sem); 2463 if (newsize > EXT4_I(inode)->i_disksize) 2464 EXT4_I(inode)->i_disksize = newsize; 2465 up_write(&EXT4_I(inode)->i_data_sem); 2466 } 2467 2468 struct ext4_group_info { 2469 unsigned long bb_state; 2470 struct rb_root bb_free_root; 2471 ext4_grpblk_t bb_first_free; /* first free block */ 2472 ext4_grpblk_t bb_free; /* total free blocks */ 2473 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 2474 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 2475 struct list_head bb_prealloc_list; 2476 #ifdef DOUBLE_CHECK 2477 void *bb_bitmap; 2478 #endif 2479 struct rw_semaphore alloc_sem; 2480 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2481 * regions, index is order. 2482 * bb_counters[3] = 5 means 2483 * 5 free 8-block regions. */ 2484 }; 2485 2486 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 2487 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 2488 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 2489 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 2490 2491 #define EXT4_MB_GRP_NEED_INIT(grp) \ 2492 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 2493 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 2494 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2495 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 2496 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2497 2498 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 2499 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2500 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 2501 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2502 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 2503 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2504 2505 #define EXT4_MAX_CONTENTION 8 2506 #define EXT4_CONTENTION_THRESHOLD 2 2507 2508 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2509 ext4_group_t group) 2510 { 2511 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2512 } 2513 2514 /* 2515 * Returns true if the filesystem is busy enough that attempts to 2516 * access the block group locks has run into contention. 2517 */ 2518 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 2519 { 2520 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 2521 } 2522 2523 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 2524 { 2525 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 2526 if (spin_trylock(lock)) 2527 /* 2528 * We're able to grab the lock right away, so drop the 2529 * lock contention counter. 2530 */ 2531 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 2532 else { 2533 /* 2534 * The lock is busy, so bump the contention counter, 2535 * and then wait on the spin lock. 2536 */ 2537 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 2538 EXT4_MAX_CONTENTION); 2539 spin_lock(lock); 2540 } 2541 } 2542 2543 static inline void ext4_unlock_group(struct super_block *sb, 2544 ext4_group_t group) 2545 { 2546 spin_unlock(ext4_group_lock_ptr(sb, group)); 2547 } 2548 2549 /* 2550 * Block validity checking 2551 */ 2552 #define ext4_check_indirect_blockref(inode, bh) \ 2553 ext4_check_blockref(__func__, __LINE__, inode, \ 2554 (__le32 *)(bh)->b_data, \ 2555 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 2556 2557 #define ext4_ind_check_inode(inode) \ 2558 ext4_check_blockref(__func__, __LINE__, inode, \ 2559 EXT4_I(inode)->i_data, \ 2560 EXT4_NDIR_BLOCKS) 2561 2562 /* 2563 * Inodes and files operations 2564 */ 2565 2566 /* dir.c */ 2567 extern const struct file_operations ext4_dir_operations; 2568 2569 /* file.c */ 2570 extern const struct inode_operations ext4_file_inode_operations; 2571 extern const struct file_operations ext4_file_operations; 2572 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 2573 extern void ext4_unwritten_wait(struct inode *inode); 2574 2575 /* inline.c */ 2576 extern int ext4_has_inline_data(struct inode *inode); 2577 extern int ext4_get_inline_size(struct inode *inode); 2578 extern int ext4_get_max_inline_size(struct inode *inode); 2579 extern int ext4_find_inline_data_nolock(struct inode *inode); 2580 extern void ext4_write_inline_data(struct inode *inode, 2581 struct ext4_iloc *iloc, 2582 void *buffer, loff_t pos, 2583 unsigned int len); 2584 extern int ext4_prepare_inline_data(handle_t *handle, struct inode *inode, 2585 unsigned int len); 2586 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 2587 unsigned int len); 2588 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 2589 2590 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 2591 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 2592 struct inode *inode, 2593 loff_t pos, unsigned len, 2594 unsigned flags, 2595 struct page **pagep); 2596 extern int ext4_write_inline_data_end(struct inode *inode, 2597 loff_t pos, unsigned len, 2598 unsigned copied, 2599 struct page *page); 2600 extern struct buffer_head * 2601 ext4_journalled_write_inline_data(struct inode *inode, 2602 unsigned len, 2603 struct page *page); 2604 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 2605 struct inode *inode, 2606 loff_t pos, unsigned len, 2607 unsigned flags, 2608 struct page **pagep, 2609 void **fsdata); 2610 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 2611 unsigned len, unsigned copied, 2612 struct page *page); 2613 extern int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry, 2614 struct inode *inode); 2615 extern int ext4_try_create_inline_dir(handle_t *handle, 2616 struct inode *parent, 2617 struct inode *inode); 2618 extern int ext4_read_inline_dir(struct file *filp, 2619 struct dir_context *ctx, 2620 int *has_inline_data); 2621 extern int htree_inlinedir_to_tree(struct file *dir_file, 2622 struct inode *dir, ext4_lblk_t block, 2623 struct dx_hash_info *hinfo, 2624 __u32 start_hash, __u32 start_minor_hash, 2625 int *has_inline_data); 2626 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 2627 const struct qstr *d_name, 2628 struct ext4_dir_entry_2 **res_dir, 2629 int *has_inline_data); 2630 extern int ext4_delete_inline_entry(handle_t *handle, 2631 struct inode *dir, 2632 struct ext4_dir_entry_2 *de_del, 2633 struct buffer_head *bh, 2634 int *has_inline_data); 2635 extern int empty_inline_dir(struct inode *dir, int *has_inline_data); 2636 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 2637 struct ext4_dir_entry_2 **parent_de, 2638 int *retval); 2639 extern int ext4_inline_data_fiemap(struct inode *inode, 2640 struct fiemap_extent_info *fieinfo, 2641 int *has_inline); 2642 extern int ext4_try_to_evict_inline_data(handle_t *handle, 2643 struct inode *inode, 2644 int needed); 2645 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline); 2646 2647 extern int ext4_convert_inline_data(struct inode *inode); 2648 2649 /* namei.c */ 2650 extern const struct inode_operations ext4_dir_inode_operations; 2651 extern const struct inode_operations ext4_special_inode_operations; 2652 extern struct dentry *ext4_get_parent(struct dentry *child); 2653 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 2654 struct ext4_dir_entry_2 *de, 2655 int blocksize, int csum_size, 2656 unsigned int parent_ino, int dotdot_real_len); 2657 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t, 2658 unsigned int blocksize); 2659 extern int ext4_handle_dirty_dirent_node(handle_t *handle, 2660 struct inode *inode, 2661 struct buffer_head *bh); 2662 #define S_SHIFT 12 2663 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = { 2664 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 2665 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 2666 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 2667 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 2668 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 2669 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 2670 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 2671 }; 2672 2673 static inline void ext4_set_de_type(struct super_block *sb, 2674 struct ext4_dir_entry_2 *de, 2675 umode_t mode) { 2676 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE)) 2677 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 2678 } 2679 2680 2681 /* symlink.c */ 2682 extern const struct inode_operations ext4_symlink_inode_operations; 2683 extern const struct inode_operations ext4_fast_symlink_inode_operations; 2684 2685 /* block_validity */ 2686 extern void ext4_release_system_zone(struct super_block *sb); 2687 extern int ext4_setup_system_zone(struct super_block *sb); 2688 extern int __init ext4_init_system_zone(void); 2689 extern void ext4_exit_system_zone(void); 2690 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 2691 ext4_fsblk_t start_blk, 2692 unsigned int count); 2693 extern int ext4_check_blockref(const char *, unsigned int, 2694 struct inode *, __le32 *, unsigned int); 2695 2696 /* extents.c */ 2697 struct ext4_ext_path; 2698 struct ext4_extent; 2699 2700 /* 2701 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 2702 * __le32. 2703 */ 2704 #define EXT_MAX_BLOCKS 0xffffffff 2705 2706 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 2707 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 2708 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 2709 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 2710 struct ext4_map_blocks *map, int flags); 2711 extern void ext4_ext_truncate(handle_t *, struct inode *); 2712 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 2713 ext4_lblk_t end); 2714 extern void ext4_ext_init(struct super_block *); 2715 extern void ext4_ext_release(struct super_block *); 2716 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 2717 loff_t len); 2718 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 2719 loff_t offset, ssize_t len); 2720 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 2721 struct ext4_map_blocks *map, int flags); 2722 extern int ext4_ext_calc_metadata_amount(struct inode *inode, 2723 ext4_lblk_t lblocks); 2724 extern int ext4_extent_tree_init(handle_t *, struct inode *); 2725 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 2726 int num, 2727 struct ext4_ext_path *path); 2728 extern int ext4_can_extents_be_merged(struct inode *inode, 2729 struct ext4_extent *ex1, 2730 struct ext4_extent *ex2); 2731 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 2732 struct ext4_ext_path *, 2733 struct ext4_extent *, int); 2734 extern struct ext4_ext_path *ext4_ext_find_extent(struct inode *, ext4_lblk_t, 2735 struct ext4_ext_path *, 2736 int flags); 2737 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 2738 extern int ext4_ext_check_inode(struct inode *inode); 2739 extern int ext4_find_delalloc_range(struct inode *inode, 2740 ext4_lblk_t lblk_start, 2741 ext4_lblk_t lblk_end); 2742 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk); 2743 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2744 __u64 start, __u64 len); 2745 extern int ext4_ext_precache(struct inode *inode); 2746 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len); 2747 2748 /* move_extent.c */ 2749 extern void ext4_double_down_write_data_sem(struct inode *first, 2750 struct inode *second); 2751 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 2752 struct inode *donor_inode); 2753 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 2754 __u64 start_orig, __u64 start_donor, 2755 __u64 len, __u64 *moved_len); 2756 extern int mext_next_extent(struct inode *inode, struct ext4_ext_path *path, 2757 struct ext4_extent **extent); 2758 2759 /* page-io.c */ 2760 extern int __init ext4_init_pageio(void); 2761 extern void ext4_exit_pageio(void); 2762 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 2763 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 2764 extern int ext4_put_io_end(ext4_io_end_t *io_end); 2765 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 2766 extern void ext4_io_submit_init(struct ext4_io_submit *io, 2767 struct writeback_control *wbc); 2768 extern void ext4_end_io_rsv_work(struct work_struct *work); 2769 extern void ext4_io_submit(struct ext4_io_submit *io); 2770 extern int ext4_bio_write_page(struct ext4_io_submit *io, 2771 struct page *page, 2772 int len, 2773 struct writeback_control *wbc); 2774 2775 /* mmp.c */ 2776 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 2777 extern void ext4_mmp_csum_set(struct super_block *sb, struct mmp_struct *mmp); 2778 extern int ext4_mmp_csum_verify(struct super_block *sb, 2779 struct mmp_struct *mmp); 2780 2781 /* 2782 * Note that these flags will never ever appear in a buffer_head's state flag. 2783 * See EXT4_MAP_... to see where this is used. 2784 */ 2785 enum ext4_state_bits { 2786 BH_AllocFromCluster /* allocated blocks were part of already 2787 * allocated cluster. */ 2788 = BH_JBDPrivateStart 2789 }; 2790 2791 /* 2792 * Add new method to test whether block and inode bitmaps are properly 2793 * initialized. With uninit_bg reading the block from disk is not enough 2794 * to mark the bitmap uptodate. We need to also zero-out the bitmap 2795 */ 2796 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 2797 2798 static inline int bitmap_uptodate(struct buffer_head *bh) 2799 { 2800 return (buffer_uptodate(bh) && 2801 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 2802 } 2803 static inline void set_bitmap_uptodate(struct buffer_head *bh) 2804 { 2805 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 2806 } 2807 2808 /* 2809 * Disable DIO read nolock optimization, so new dioreaders will be forced 2810 * to grab i_mutex 2811 */ 2812 static inline void ext4_inode_block_unlocked_dio(struct inode *inode) 2813 { 2814 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 2815 smp_mb(); 2816 } 2817 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode) 2818 { 2819 smp_mb(); 2820 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 2821 } 2822 2823 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 2824 2825 /* For ioend & aio unwritten conversion wait queues */ 2826 #define EXT4_WQ_HASH_SZ 37 2827 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 2828 EXT4_WQ_HASH_SZ]) 2829 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\ 2830 EXT4_WQ_HASH_SZ]) 2831 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 2832 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; 2833 2834 #define EXT4_RESIZING 0 2835 extern int ext4_resize_begin(struct super_block *sb); 2836 extern void ext4_resize_end(struct super_block *sb); 2837 2838 #endif /* __KERNEL__ */ 2839 2840 #endif /* _EXT4_H */ 2841