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 unwritten 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 unwritten 540 extent to be an initialized ext4 */ 541 #define EXT4_GET_BLOCKS_CREATE 0x0001 542 /* Request the creation of an unwritten extent */ 543 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 544 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_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 unwritten extents if not allocated, split the unwritten 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_UNWRIT_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_UNWRIT_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_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 0x40000000 583 #define EXT4_EX_FORCE_CACHE 0x20000000 584 585 /* 586 * Flags used by ext4_free_blocks 587 */ 588 #define EXT4_FREE_BLOCKS_METADATA 0x0001 589 #define EXT4_FREE_BLOCKS_FORGET 0x0002 590 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 591 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 592 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 593 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 594 595 /* 596 * ioctl commands 597 */ 598 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 599 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 600 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 601 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 602 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 603 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 604 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 605 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 606 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 607 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 608 #define EXT4_IOC_MIGRATE _IO('f', 9) 609 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 610 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 611 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 612 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 613 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 614 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 615 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 616 617 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 618 /* 619 * ioctl commands in 32 bit emulation 620 */ 621 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 622 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 623 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 624 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 625 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 626 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 627 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 628 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 629 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 630 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 631 #endif 632 633 /* Max physical block we can address w/o extents */ 634 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 635 636 /* 637 * Structure of an inode on the disk 638 */ 639 struct ext4_inode { 640 __le16 i_mode; /* File mode */ 641 __le16 i_uid; /* Low 16 bits of Owner Uid */ 642 __le32 i_size_lo; /* Size in bytes */ 643 __le32 i_atime; /* Access time */ 644 __le32 i_ctime; /* Inode Change time */ 645 __le32 i_mtime; /* Modification time */ 646 __le32 i_dtime; /* Deletion Time */ 647 __le16 i_gid; /* Low 16 bits of Group Id */ 648 __le16 i_links_count; /* Links count */ 649 __le32 i_blocks_lo; /* Blocks count */ 650 __le32 i_flags; /* File flags */ 651 union { 652 struct { 653 __le32 l_i_version; 654 } linux1; 655 struct { 656 __u32 h_i_translator; 657 } hurd1; 658 struct { 659 __u32 m_i_reserved1; 660 } masix1; 661 } osd1; /* OS dependent 1 */ 662 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 663 __le32 i_generation; /* File version (for NFS) */ 664 __le32 i_file_acl_lo; /* File ACL */ 665 __le32 i_size_high; 666 __le32 i_obso_faddr; /* Obsoleted fragment address */ 667 union { 668 struct { 669 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 670 __le16 l_i_file_acl_high; 671 __le16 l_i_uid_high; /* these 2 fields */ 672 __le16 l_i_gid_high; /* were reserved2[0] */ 673 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 674 __le16 l_i_reserved; 675 } linux2; 676 struct { 677 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 678 __u16 h_i_mode_high; 679 __u16 h_i_uid_high; 680 __u16 h_i_gid_high; 681 __u32 h_i_author; 682 } hurd2; 683 struct { 684 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 685 __le16 m_i_file_acl_high; 686 __u32 m_i_reserved2[2]; 687 } masix2; 688 } osd2; /* OS dependent 2 */ 689 __le16 i_extra_isize; 690 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 691 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 692 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 693 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 694 __le32 i_crtime; /* File Creation time */ 695 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 696 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 697 }; 698 699 struct move_extent { 700 __u32 reserved; /* should be zero */ 701 __u32 donor_fd; /* donor file descriptor */ 702 __u64 orig_start; /* logical start offset in block for orig */ 703 __u64 donor_start; /* logical start offset in block for donor */ 704 __u64 len; /* block length to be moved */ 705 __u64 moved_len; /* moved block length */ 706 }; 707 708 #define EXT4_EPOCH_BITS 2 709 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 710 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 711 712 /* 713 * Extended fields will fit into an inode if the filesystem was formatted 714 * with large inodes (-I 256 or larger) and there are not currently any EAs 715 * consuming all of the available space. For new inodes we always reserve 716 * enough space for the kernel's known extended fields, but for inodes 717 * created with an old kernel this might not have been the case. None of 718 * the extended inode fields is critical for correct filesystem operation. 719 * This macro checks if a certain field fits in the inode. Note that 720 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 721 */ 722 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 723 ((offsetof(typeof(*ext4_inode), field) + \ 724 sizeof((ext4_inode)->field)) \ 725 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 726 (einode)->i_extra_isize)) \ 727 728 static inline __le32 ext4_encode_extra_time(struct timespec *time) 729 { 730 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 731 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | 732 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); 733 } 734 735 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 736 { 737 if (sizeof(time->tv_sec) > 4) 738 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 739 << 32; 740 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 741 } 742 743 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 744 do { \ 745 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 746 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 747 (raw_inode)->xtime ## _extra = \ 748 ext4_encode_extra_time(&(inode)->xtime); \ 749 } while (0) 750 751 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 752 do { \ 753 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 754 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 755 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 756 (raw_inode)->xtime ## _extra = \ 757 ext4_encode_extra_time(&(einode)->xtime); \ 758 } while (0) 759 760 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 761 do { \ 762 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 763 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 764 ext4_decode_extra_time(&(inode)->xtime, \ 765 raw_inode->xtime ## _extra); \ 766 else \ 767 (inode)->xtime.tv_nsec = 0; \ 768 } while (0) 769 770 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 771 do { \ 772 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 773 (einode)->xtime.tv_sec = \ 774 (signed)le32_to_cpu((raw_inode)->xtime); \ 775 else \ 776 (einode)->xtime.tv_sec = 0; \ 777 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 778 ext4_decode_extra_time(&(einode)->xtime, \ 779 raw_inode->xtime ## _extra); \ 780 else \ 781 (einode)->xtime.tv_nsec = 0; \ 782 } while (0) 783 784 #define i_disk_version osd1.linux1.l_i_version 785 786 #if defined(__KERNEL__) || defined(__linux__) 787 #define i_reserved1 osd1.linux1.l_i_reserved1 788 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 789 #define i_blocks_high osd2.linux2.l_i_blocks_high 790 #define i_uid_low i_uid 791 #define i_gid_low i_gid 792 #define i_uid_high osd2.linux2.l_i_uid_high 793 #define i_gid_high osd2.linux2.l_i_gid_high 794 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 795 796 #elif defined(__GNU__) 797 798 #define i_translator osd1.hurd1.h_i_translator 799 #define i_uid_high osd2.hurd2.h_i_uid_high 800 #define i_gid_high osd2.hurd2.h_i_gid_high 801 #define i_author osd2.hurd2.h_i_author 802 803 #elif defined(__masix__) 804 805 #define i_reserved1 osd1.masix1.m_i_reserved1 806 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 807 #define i_reserved2 osd2.masix2.m_i_reserved2 808 809 #endif /* defined(__KERNEL__) || defined(__linux__) */ 810 811 #include "extents_status.h" 812 813 /* 814 * fourth extended file system inode data in memory 815 */ 816 struct ext4_inode_info { 817 __le32 i_data[15]; /* unconverted */ 818 __u32 i_dtime; 819 ext4_fsblk_t i_file_acl; 820 821 /* 822 * i_block_group is the number of the block group which contains 823 * this file's inode. Constant across the lifetime of the inode, 824 * it is ued for making block allocation decisions - we try to 825 * place a file's data blocks near its inode block, and new inodes 826 * near to their parent directory's inode. 827 */ 828 ext4_group_t i_block_group; 829 ext4_lblk_t i_dir_start_lookup; 830 #if (BITS_PER_LONG < 64) 831 unsigned long i_state_flags; /* Dynamic state flags */ 832 #endif 833 unsigned long i_flags; 834 835 /* 836 * Extended attributes can be read independently of the main file 837 * data. Taking i_mutex even when reading would cause contention 838 * between readers of EAs and writers of regular file data, so 839 * instead we synchronize on xattr_sem when reading or changing 840 * EAs. 841 */ 842 struct rw_semaphore xattr_sem; 843 844 struct list_head i_orphan; /* unlinked but open inodes */ 845 846 /* 847 * i_disksize keeps track of what the inode size is ON DISK, not 848 * in memory. During truncate, i_size is set to the new size by 849 * the VFS prior to calling ext4_truncate(), but the filesystem won't 850 * set i_disksize to 0 until the truncate is actually under way. 851 * 852 * The intent is that i_disksize always represents the blocks which 853 * are used by this file. This allows recovery to restart truncate 854 * on orphans if we crash during truncate. We actually write i_disksize 855 * into the on-disk inode when writing inodes out, instead of i_size. 856 * 857 * The only time when i_disksize and i_size may be different is when 858 * a truncate is in progress. The only things which change i_disksize 859 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 860 */ 861 loff_t i_disksize; 862 863 /* 864 * i_data_sem is for serialising ext4_truncate() against 865 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 866 * data tree are chopped off during truncate. We can't do that in 867 * ext4 because whenever we perform intermediate commits during 868 * truncate, the inode and all the metadata blocks *must* be in a 869 * consistent state which allows truncation of the orphans to restart 870 * during recovery. Hence we must fix the get_block-vs-truncate race 871 * by other means, so we have i_data_sem. 872 */ 873 struct rw_semaphore i_data_sem; 874 struct inode vfs_inode; 875 struct jbd2_inode *jinode; 876 877 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 878 879 /* 880 * File creation time. Its function is same as that of 881 * struct timespec i_{a,c,m}time in the generic inode. 882 */ 883 struct timespec i_crtime; 884 885 /* mballoc */ 886 struct list_head i_prealloc_list; 887 spinlock_t i_prealloc_lock; 888 889 /* extents status tree */ 890 struct ext4_es_tree i_es_tree; 891 rwlock_t i_es_lock; 892 struct list_head i_es_lru; 893 unsigned int i_es_all_nr; /* protected by i_es_lock */ 894 unsigned int i_es_lru_nr; /* protected by i_es_lock */ 895 unsigned long i_touch_when; /* jiffies of last accessing */ 896 897 /* ialloc */ 898 ext4_group_t i_last_alloc_group; 899 900 /* allocation reservation info for delalloc */ 901 /* In case of bigalloc, these refer to clusters rather than blocks */ 902 unsigned int i_reserved_data_blocks; 903 unsigned int i_reserved_meta_blocks; 904 unsigned int i_allocated_meta_blocks; 905 ext4_lblk_t i_da_metadata_calc_last_lblock; 906 int i_da_metadata_calc_len; 907 908 /* on-disk additional length */ 909 __u16 i_extra_isize; 910 911 /* Indicate the inline data space. */ 912 u16 i_inline_off; 913 u16 i_inline_size; 914 915 #ifdef CONFIG_QUOTA 916 /* quota space reservation, managed internally by quota code */ 917 qsize_t i_reserved_quota; 918 #endif 919 920 /* Lock protecting lists below */ 921 spinlock_t i_completed_io_lock; 922 /* 923 * Completed IOs that need unwritten extents handling and have 924 * transaction reserved 925 */ 926 struct list_head i_rsv_conversion_list; 927 /* 928 * Completed IOs that need unwritten extents handling and don't have 929 * transaction reserved 930 */ 931 atomic_t i_ioend_count; /* Number of outstanding io_end structs */ 932 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 933 struct work_struct i_rsv_conversion_work; 934 935 spinlock_t i_block_reservation_lock; 936 937 /* 938 * Transactions that contain inode's metadata needed to complete 939 * fsync and fdatasync, respectively. 940 */ 941 tid_t i_sync_tid; 942 tid_t i_datasync_tid; 943 944 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 945 __u32 i_csum_seed; 946 }; 947 948 /* 949 * File system states 950 */ 951 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 952 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 953 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 954 955 /* 956 * Misc. filesystem flags 957 */ 958 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 959 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 960 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 961 962 /* 963 * Mount flags set via mount options or defaults 964 */ 965 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 966 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 967 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 968 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 969 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 970 #define EXT4_MOUNT_ERRORS_MASK 0x00070 971 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 972 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 973 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 974 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 975 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 976 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 977 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 978 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 979 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 980 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 981 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 982 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 983 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 984 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 985 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 986 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 987 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 988 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 989 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 990 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 991 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 992 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 993 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 994 995 /* 996 * Mount flags set either automatically (could not be set by mount option) 997 * based on per file system feature or property or in special cases such as 998 * distinguishing between explicit mount option definition and default. 999 */ 1000 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1001 specified delalloc */ 1002 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1003 size of blocksize * 8 1004 blocks */ 1005 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1006 file systems */ 1007 1008 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1009 ~EXT4_MOUNT_##opt 1010 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1011 EXT4_MOUNT_##opt 1012 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1013 EXT4_MOUNT_##opt) 1014 1015 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1016 ~EXT4_MOUNT2_##opt 1017 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1018 EXT4_MOUNT2_##opt 1019 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1020 EXT4_MOUNT2_##opt) 1021 1022 #define ext4_test_and_set_bit __test_and_set_bit_le 1023 #define ext4_set_bit __set_bit_le 1024 #define ext4_set_bit_atomic ext2_set_bit_atomic 1025 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1026 #define ext4_clear_bit __clear_bit_le 1027 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1028 #define ext4_test_bit test_bit_le 1029 #define ext4_find_next_zero_bit find_next_zero_bit_le 1030 #define ext4_find_next_bit find_next_bit_le 1031 1032 extern void ext4_set_bits(void *bm, int cur, int len); 1033 1034 /* 1035 * Maximal mount counts between two filesystem checks 1036 */ 1037 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1038 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1039 1040 /* 1041 * Behaviour when detecting errors 1042 */ 1043 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1044 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1045 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1046 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1047 1048 /* Metadata checksum algorithm codes */ 1049 #define EXT4_CRC32C_CHKSUM 1 1050 1051 /* 1052 * Structure of the super block 1053 */ 1054 struct ext4_super_block { 1055 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1056 __le32 s_blocks_count_lo; /* Blocks count */ 1057 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1058 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1059 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1060 __le32 s_first_data_block; /* First Data Block */ 1061 __le32 s_log_block_size; /* Block size */ 1062 __le32 s_log_cluster_size; /* Allocation cluster size */ 1063 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1064 __le32 s_clusters_per_group; /* # Clusters per group */ 1065 __le32 s_inodes_per_group; /* # Inodes per group */ 1066 __le32 s_mtime; /* Mount time */ 1067 /*30*/ __le32 s_wtime; /* Write time */ 1068 __le16 s_mnt_count; /* Mount count */ 1069 __le16 s_max_mnt_count; /* Maximal mount count */ 1070 __le16 s_magic; /* Magic signature */ 1071 __le16 s_state; /* File system state */ 1072 __le16 s_errors; /* Behaviour when detecting errors */ 1073 __le16 s_minor_rev_level; /* minor revision level */ 1074 /*40*/ __le32 s_lastcheck; /* time of last check */ 1075 __le32 s_checkinterval; /* max. time between checks */ 1076 __le32 s_creator_os; /* OS */ 1077 __le32 s_rev_level; /* Revision level */ 1078 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1079 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1080 /* 1081 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1082 * 1083 * Note: the difference between the compatible feature set and 1084 * the incompatible feature set is that if there is a bit set 1085 * in the incompatible feature set that the kernel doesn't 1086 * know about, it should refuse to mount the filesystem. 1087 * 1088 * e2fsck's requirements are more strict; if it doesn't know 1089 * about a feature in either the compatible or incompatible 1090 * feature set, it must abort and not try to meddle with 1091 * things it doesn't understand... 1092 */ 1093 __le32 s_first_ino; /* First non-reserved inode */ 1094 __le16 s_inode_size; /* size of inode structure */ 1095 __le16 s_block_group_nr; /* block group # of this superblock */ 1096 __le32 s_feature_compat; /* compatible feature set */ 1097 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1098 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1099 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1100 /*78*/ char s_volume_name[16]; /* volume name */ 1101 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 1102 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1103 /* 1104 * Performance hints. Directory preallocation should only 1105 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1106 */ 1107 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1108 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1109 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1110 /* 1111 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1112 */ 1113 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1114 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1115 __le32 s_journal_dev; /* device number of journal file */ 1116 __le32 s_last_orphan; /* start of list of inodes to delete */ 1117 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1118 __u8 s_def_hash_version; /* Default hash version to use */ 1119 __u8 s_jnl_backup_type; 1120 __le16 s_desc_size; /* size of group descriptor */ 1121 /*100*/ __le32 s_default_mount_opts; 1122 __le32 s_first_meta_bg; /* First metablock block group */ 1123 __le32 s_mkfs_time; /* When the filesystem was created */ 1124 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1125 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1126 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1127 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1128 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1129 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1130 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1131 __le32 s_flags; /* Miscellaneous flags */ 1132 __le16 s_raid_stride; /* RAID stride */ 1133 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1134 __le64 s_mmp_block; /* Block for multi-mount protection */ 1135 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1136 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1137 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1138 __le16 s_reserved_pad; 1139 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1140 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1141 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1142 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1143 snapshot's future use */ 1144 __le32 s_snapshot_list; /* inode number of the head of the 1145 on-disk snapshot list */ 1146 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1147 __le32 s_error_count; /* number of fs errors */ 1148 __le32 s_first_error_time; /* first time an error happened */ 1149 __le32 s_first_error_ino; /* inode involved in first error */ 1150 __le64 s_first_error_block; /* block involved of first error */ 1151 __u8 s_first_error_func[32]; /* function where the error happened */ 1152 __le32 s_first_error_line; /* line number where error happened */ 1153 __le32 s_last_error_time; /* most recent time of an error */ 1154 __le32 s_last_error_ino; /* inode involved in last error */ 1155 __le32 s_last_error_line; /* line number where error happened */ 1156 __le64 s_last_error_block; /* block involved of last error */ 1157 __u8 s_last_error_func[32]; /* function where the error happened */ 1158 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1159 __u8 s_mount_opts[64]; 1160 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1161 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1162 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1163 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1164 __le32 s_reserved[106]; /* Padding to the end of the block */ 1165 __le32 s_checksum; /* crc32c(superblock) */ 1166 }; 1167 1168 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1169 1170 #ifdef __KERNEL__ 1171 1172 /* 1173 * run-time mount flags 1174 */ 1175 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1176 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1177 1178 /* 1179 * fourth extended-fs super-block data in memory 1180 */ 1181 struct ext4_sb_info { 1182 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1183 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1184 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1185 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1186 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1187 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1188 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1189 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1190 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1191 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1192 unsigned long s_overhead; /* # of fs overhead clusters */ 1193 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1194 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1195 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1196 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1197 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1198 struct buffer_head **s_group_desc; 1199 unsigned int s_mount_opt; 1200 unsigned int s_mount_opt2; 1201 unsigned int s_mount_flags; 1202 unsigned int s_def_mount_opt; 1203 ext4_fsblk_t s_sb_block; 1204 atomic64_t s_resv_clusters; 1205 kuid_t s_resuid; 1206 kgid_t s_resgid; 1207 unsigned short s_mount_state; 1208 unsigned short s_pad; 1209 int s_addr_per_block_bits; 1210 int s_desc_per_block_bits; 1211 int s_inode_size; 1212 int s_first_ino; 1213 unsigned int s_inode_readahead_blks; 1214 unsigned int s_inode_goal; 1215 spinlock_t s_next_gen_lock; 1216 u32 s_next_generation; 1217 u32 s_hash_seed[4]; 1218 int s_def_hash_version; 1219 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1220 struct percpu_counter s_freeclusters_counter; 1221 struct percpu_counter s_freeinodes_counter; 1222 struct percpu_counter s_dirs_counter; 1223 struct percpu_counter s_dirtyclusters_counter; 1224 struct blockgroup_lock *s_blockgroup_lock; 1225 struct proc_dir_entry *s_proc; 1226 struct kobject s_kobj; 1227 struct completion s_kobj_unregister; 1228 struct super_block *s_sb; 1229 1230 /* Journaling */ 1231 struct journal_s *s_journal; 1232 struct list_head s_orphan; 1233 struct mutex s_orphan_lock; 1234 unsigned long s_resize_flags; /* Flags indicating if there 1235 is a resizer */ 1236 unsigned long s_commit_interval; 1237 u32 s_max_batch_time; 1238 u32 s_min_batch_time; 1239 struct block_device *journal_bdev; 1240 #ifdef CONFIG_QUOTA 1241 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ 1242 int s_jquota_fmt; /* Format of quota to use */ 1243 #endif 1244 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1245 struct rb_root system_blks; 1246 1247 #ifdef EXTENTS_STATS 1248 /* ext4 extents stats */ 1249 unsigned long s_ext_min; 1250 unsigned long s_ext_max; 1251 unsigned long s_depth_max; 1252 spinlock_t s_ext_stats_lock; 1253 unsigned long s_ext_blocks; 1254 unsigned long s_ext_extents; 1255 #endif 1256 1257 /* for buddy allocator */ 1258 struct ext4_group_info ***s_group_info; 1259 struct inode *s_buddy_cache; 1260 spinlock_t s_md_lock; 1261 unsigned short *s_mb_offsets; 1262 unsigned int *s_mb_maxs; 1263 unsigned int s_group_info_size; 1264 1265 /* tunables */ 1266 unsigned long s_stripe; 1267 unsigned int s_mb_stream_request; 1268 unsigned int s_mb_max_to_scan; 1269 unsigned int s_mb_min_to_scan; 1270 unsigned int s_mb_stats; 1271 unsigned int s_mb_order2_reqs; 1272 unsigned int s_mb_group_prealloc; 1273 unsigned int s_max_dir_size_kb; 1274 /* where last allocation was done - for stream allocation */ 1275 unsigned long s_mb_last_group; 1276 unsigned long s_mb_last_start; 1277 1278 /* stats for buddy allocator */ 1279 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1280 atomic_t s_bal_success; /* we found long enough chunks */ 1281 atomic_t s_bal_allocated; /* in blocks */ 1282 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1283 atomic_t s_bal_goals; /* goal hits */ 1284 atomic_t s_bal_breaks; /* too long searches */ 1285 atomic_t s_bal_2orders; /* 2^order hits */ 1286 spinlock_t s_bal_lock; 1287 unsigned long s_mb_buddies_generated; 1288 unsigned long long s_mb_generation_time; 1289 atomic_t s_mb_lost_chunks; 1290 atomic_t s_mb_preallocated; 1291 atomic_t s_mb_discarded; 1292 atomic_t s_lock_busy; 1293 1294 /* locality groups */ 1295 struct ext4_locality_group __percpu *s_locality_groups; 1296 1297 /* for write statistics */ 1298 unsigned long s_sectors_written_start; 1299 u64 s_kbytes_written; 1300 1301 /* the size of zero-out chunk */ 1302 unsigned int s_extent_max_zeroout_kb; 1303 1304 unsigned int s_log_groups_per_flex; 1305 struct flex_groups *s_flex_groups; 1306 ext4_group_t s_flex_groups_allocated; 1307 1308 /* workqueue for reserved extent conversions (buffered io) */ 1309 struct workqueue_struct *rsv_conversion_wq; 1310 1311 /* timer for periodic error stats printing */ 1312 struct timer_list s_err_report; 1313 1314 /* Lazy inode table initialization info */ 1315 struct ext4_li_request *s_li_request; 1316 /* Wait multiplier for lazy initialization thread */ 1317 unsigned int s_li_wait_mult; 1318 1319 /* Kernel thread for multiple mount protection */ 1320 struct task_struct *s_mmp_tsk; 1321 1322 /* record the last minlen when FITRIM is called. */ 1323 atomic_t s_last_trim_minblks; 1324 1325 /* Reference to checksum algorithm driver via cryptoapi */ 1326 struct crypto_shash *s_chksum_driver; 1327 1328 /* Precomputed FS UUID checksum for seeding other checksums */ 1329 __u32 s_csum_seed; 1330 1331 /* Reclaim extents from extent status tree */ 1332 struct shrinker s_es_shrinker; 1333 struct list_head s_es_lru; 1334 struct ext4_es_stats s_es_stats; 1335 struct mb_cache *s_mb_cache; 1336 spinlock_t s_es_lru_lock ____cacheline_aligned_in_smp; 1337 1338 /* Ratelimit ext4 messages. */ 1339 struct ratelimit_state s_err_ratelimit_state; 1340 struct ratelimit_state s_warning_ratelimit_state; 1341 struct ratelimit_state s_msg_ratelimit_state; 1342 }; 1343 1344 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1345 { 1346 return sb->s_fs_info; 1347 } 1348 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1349 { 1350 return container_of(inode, struct ext4_inode_info, vfs_inode); 1351 } 1352 1353 static inline struct timespec ext4_current_time(struct inode *inode) 1354 { 1355 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1356 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1357 } 1358 1359 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1360 { 1361 return ino == EXT4_ROOT_INO || 1362 ino == EXT4_USR_QUOTA_INO || 1363 ino == EXT4_GRP_QUOTA_INO || 1364 ino == EXT4_BOOT_LOADER_INO || 1365 ino == EXT4_JOURNAL_INO || 1366 ino == EXT4_RESIZE_INO || 1367 (ino >= EXT4_FIRST_INO(sb) && 1368 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1369 } 1370 1371 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 1372 struct ext4_io_end *io_end) 1373 { 1374 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 1375 io_end->flag |= EXT4_IO_END_UNWRITTEN; 1376 atomic_inc(&EXT4_I(inode)->i_unwritten); 1377 } 1378 } 1379 1380 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode) 1381 { 1382 return inode->i_private; 1383 } 1384 1385 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io) 1386 { 1387 inode->i_private = io; 1388 } 1389 1390 /* 1391 * Inode dynamic state flags 1392 */ 1393 enum { 1394 EXT4_STATE_JDATA, /* journaled data exists */ 1395 EXT4_STATE_NEW, /* inode is newly created */ 1396 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1397 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1398 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1399 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1400 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1401 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1402 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read 1403 nolocking */ 1404 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1405 EXT4_STATE_ORDERED_MODE, /* data=ordered mode */ 1406 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1407 }; 1408 1409 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1410 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1411 { \ 1412 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1413 } \ 1414 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1415 { \ 1416 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1417 } \ 1418 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1419 { \ 1420 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1421 } 1422 1423 /* Add these declarations here only so that these functions can be 1424 * found by name. Otherwise, they are very hard to locate. */ 1425 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1426 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1427 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1428 EXT4_INODE_BIT_FNS(flag, flags, 0) 1429 1430 /* Add these declarations here only so that these functions can be 1431 * found by name. Otherwise, they are very hard to locate. */ 1432 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1433 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1434 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1435 #if (BITS_PER_LONG < 64) 1436 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1437 1438 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1439 { 1440 (ei)->i_state_flags = 0; 1441 } 1442 #else 1443 EXT4_INODE_BIT_FNS(state, flags, 32) 1444 1445 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1446 { 1447 /* We depend on the fact that callers will set i_flags */ 1448 } 1449 #endif 1450 #else 1451 /* Assume that user mode programs are passing in an ext4fs superblock, not 1452 * a kernel struct super_block. This will allow us to call the feature-test 1453 * macros from user land. */ 1454 #define EXT4_SB(sb) (sb) 1455 #endif 1456 1457 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1458 1459 /* 1460 * Codes for operating systems 1461 */ 1462 #define EXT4_OS_LINUX 0 1463 #define EXT4_OS_HURD 1 1464 #define EXT4_OS_MASIX 2 1465 #define EXT4_OS_FREEBSD 3 1466 #define EXT4_OS_LITES 4 1467 1468 /* 1469 * Revision levels 1470 */ 1471 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1472 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1473 1474 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1475 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1476 1477 #define EXT4_GOOD_OLD_INODE_SIZE 128 1478 1479 /* 1480 * Feature set definitions 1481 */ 1482 1483 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1484 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1485 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1486 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1487 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1488 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1489 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1490 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1491 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1492 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1493 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1494 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1495 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1496 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1497 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1498 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1499 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1500 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1501 1502 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1503 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1504 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1505 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1506 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1507 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1508 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1509 1510 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1511 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1512 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1513 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1514 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1515 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1516 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1517 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1518 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1519 /* 1520 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1521 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1522 * all other data structures' checksums. However, the METADATA_CSUM and 1523 * GDT_CSUM bits are mutually exclusive. 1524 */ 1525 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1526 1527 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1528 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1529 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1530 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1531 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1532 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1533 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1534 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1535 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1536 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1537 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1538 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */ 1539 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1540 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1541 1542 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1543 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1544 EXT4_FEATURE_INCOMPAT_META_BG) 1545 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1546 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1547 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1548 1549 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1550 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1551 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1552 EXT4_FEATURE_INCOMPAT_META_BG) 1553 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1554 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1555 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1556 1557 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 1558 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1559 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1560 EXT4_FEATURE_INCOMPAT_META_BG| \ 1561 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1562 EXT4_FEATURE_INCOMPAT_64BIT| \ 1563 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1564 EXT4_FEATURE_INCOMPAT_MMP | \ 1565 EXT4_FEATURE_INCOMPAT_INLINE_DATA) 1566 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1567 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1568 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1569 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1570 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1571 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1572 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1573 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1574 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1575 EXT4_FEATURE_RO_COMPAT_QUOTA) 1576 1577 /* 1578 * Default values for user and/or group using reserved blocks 1579 */ 1580 #define EXT4_DEF_RESUID 0 1581 #define EXT4_DEF_RESGID 0 1582 1583 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1584 1585 /* 1586 * Default mount options 1587 */ 1588 #define EXT4_DEFM_DEBUG 0x0001 1589 #define EXT4_DEFM_BSDGROUPS 0x0002 1590 #define EXT4_DEFM_XATTR_USER 0x0004 1591 #define EXT4_DEFM_ACL 0x0008 1592 #define EXT4_DEFM_UID16 0x0010 1593 #define EXT4_DEFM_JMODE 0x0060 1594 #define EXT4_DEFM_JMODE_DATA 0x0020 1595 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1596 #define EXT4_DEFM_JMODE_WBACK 0x0060 1597 #define EXT4_DEFM_NOBARRIER 0x0100 1598 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1599 #define EXT4_DEFM_DISCARD 0x0400 1600 #define EXT4_DEFM_NODELALLOC 0x0800 1601 1602 /* 1603 * Default journal batch times 1604 */ 1605 #define EXT4_DEF_MIN_BATCH_TIME 0 1606 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1607 1608 /* 1609 * Minimum number of groups in a flexgroup before we separate out 1610 * directories into the first block group of a flexgroup 1611 */ 1612 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1613 1614 /* 1615 * Structure of a directory entry 1616 */ 1617 #define EXT4_NAME_LEN 255 1618 1619 struct ext4_dir_entry { 1620 __le32 inode; /* Inode number */ 1621 __le16 rec_len; /* Directory entry length */ 1622 __le16 name_len; /* Name length */ 1623 char name[EXT4_NAME_LEN]; /* File name */ 1624 }; 1625 1626 /* 1627 * The new version of the directory entry. Since EXT4 structures are 1628 * stored in intel byte order, and the name_len field could never be 1629 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1630 * file_type field. 1631 */ 1632 struct ext4_dir_entry_2 { 1633 __le32 inode; /* Inode number */ 1634 __le16 rec_len; /* Directory entry length */ 1635 __u8 name_len; /* Name length */ 1636 __u8 file_type; 1637 char name[EXT4_NAME_LEN]; /* File name */ 1638 }; 1639 1640 /* 1641 * This is a bogus directory entry at the end of each leaf block that 1642 * records checksums. 1643 */ 1644 struct ext4_dir_entry_tail { 1645 __le32 det_reserved_zero1; /* Pretend to be unused */ 1646 __le16 det_rec_len; /* 12 */ 1647 __u8 det_reserved_zero2; /* Zero name length */ 1648 __u8 det_reserved_ft; /* 0xDE, fake file type */ 1649 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1650 }; 1651 1652 #define EXT4_DIRENT_TAIL(block, blocksize) \ 1653 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 1654 ((blocksize) - \ 1655 sizeof(struct ext4_dir_entry_tail)))) 1656 1657 /* 1658 * Ext4 directory file types. Only the low 3 bits are used. The 1659 * other bits are reserved for now. 1660 */ 1661 #define EXT4_FT_UNKNOWN 0 1662 #define EXT4_FT_REG_FILE 1 1663 #define EXT4_FT_DIR 2 1664 #define EXT4_FT_CHRDEV 3 1665 #define EXT4_FT_BLKDEV 4 1666 #define EXT4_FT_FIFO 5 1667 #define EXT4_FT_SOCK 6 1668 #define EXT4_FT_SYMLINK 7 1669 1670 #define EXT4_FT_MAX 8 1671 1672 #define EXT4_FT_DIR_CSUM 0xDE 1673 1674 /* 1675 * EXT4_DIR_PAD defines the directory entries boundaries 1676 * 1677 * NOTE: It must be a multiple of 4 1678 */ 1679 #define EXT4_DIR_PAD 4 1680 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1681 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1682 ~EXT4_DIR_ROUND) 1683 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1684 1685 /* 1686 * If we ever get support for fs block sizes > page_size, we'll need 1687 * to remove the #if statements in the next two functions... 1688 */ 1689 static inline unsigned int 1690 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1691 { 1692 unsigned len = le16_to_cpu(dlen); 1693 1694 #if (PAGE_CACHE_SIZE >= 65536) 1695 if (len == EXT4_MAX_REC_LEN || len == 0) 1696 return blocksize; 1697 return (len & 65532) | ((len & 3) << 16); 1698 #else 1699 return len; 1700 #endif 1701 } 1702 1703 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1704 { 1705 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1706 BUG(); 1707 #if (PAGE_CACHE_SIZE >= 65536) 1708 if (len < 65536) 1709 return cpu_to_le16(len); 1710 if (len == blocksize) { 1711 if (blocksize == 65536) 1712 return cpu_to_le16(EXT4_MAX_REC_LEN); 1713 else 1714 return cpu_to_le16(0); 1715 } 1716 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 1717 #else 1718 return cpu_to_le16(len); 1719 #endif 1720 } 1721 1722 /* 1723 * Hash Tree Directory indexing 1724 * (c) Daniel Phillips, 2001 1725 */ 1726 1727 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 1728 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 1729 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 1730 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 1731 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 1732 1733 /* Legal values for the dx_root hash_version field: */ 1734 1735 #define DX_HASH_LEGACY 0 1736 #define DX_HASH_HALF_MD4 1 1737 #define DX_HASH_TEA 2 1738 #define DX_HASH_LEGACY_UNSIGNED 3 1739 #define DX_HASH_HALF_MD4_UNSIGNED 4 1740 #define DX_HASH_TEA_UNSIGNED 5 1741 1742 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 1743 const void *address, unsigned int length) 1744 { 1745 struct { 1746 struct shash_desc shash; 1747 char ctx[4]; 1748 } desc; 1749 int err; 1750 1751 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 1752 1753 desc.shash.tfm = sbi->s_chksum_driver; 1754 desc.shash.flags = 0; 1755 *(u32 *)desc.ctx = crc; 1756 1757 err = crypto_shash_update(&desc.shash, address, length); 1758 BUG_ON(err); 1759 1760 return *(u32 *)desc.ctx; 1761 } 1762 1763 #ifdef __KERNEL__ 1764 1765 /* hash info structure used by the directory hash */ 1766 struct dx_hash_info 1767 { 1768 u32 hash; 1769 u32 minor_hash; 1770 int hash_version; 1771 u32 *seed; 1772 }; 1773 1774 1775 /* 32 and 64 bit signed EOF for dx directories */ 1776 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 1777 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 1778 1779 1780 /* 1781 * Control parameters used by ext4_htree_next_block 1782 */ 1783 #define HASH_NB_ALWAYS 1 1784 1785 1786 /* 1787 * Describe an inode's exact location on disk and in memory 1788 */ 1789 struct ext4_iloc 1790 { 1791 struct buffer_head *bh; 1792 unsigned long offset; 1793 ext4_group_t block_group; 1794 }; 1795 1796 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 1797 { 1798 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 1799 } 1800 1801 /* 1802 * This structure is stuffed into the struct file's private_data field 1803 * for directories. It is where we put information so that we can do 1804 * readdir operations in hash tree order. 1805 */ 1806 struct dir_private_info { 1807 struct rb_root root; 1808 struct rb_node *curr_node; 1809 struct fname *extra_fname; 1810 loff_t last_pos; 1811 __u32 curr_hash; 1812 __u32 curr_minor_hash; 1813 __u32 next_hash; 1814 }; 1815 1816 /* calculate the first block number of the group */ 1817 static inline ext4_fsblk_t 1818 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 1819 { 1820 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 1821 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 1822 } 1823 1824 /* 1825 * Special error return code only used by dx_probe() and its callers. 1826 */ 1827 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 1828 1829 /* 1830 * Timeout and state flag for lazy initialization inode thread. 1831 */ 1832 #define EXT4_DEF_LI_WAIT_MULT 10 1833 #define EXT4_DEF_LI_MAX_START_DELAY 5 1834 #define EXT4_LAZYINIT_QUIT 0x0001 1835 #define EXT4_LAZYINIT_RUNNING 0x0002 1836 1837 /* 1838 * Lazy inode table initialization info 1839 */ 1840 struct ext4_lazy_init { 1841 unsigned long li_state; 1842 struct list_head li_request_list; 1843 struct mutex li_list_mtx; 1844 }; 1845 1846 struct ext4_li_request { 1847 struct super_block *lr_super; 1848 struct ext4_sb_info *lr_sbi; 1849 ext4_group_t lr_next_group; 1850 struct list_head lr_request; 1851 unsigned long lr_next_sched; 1852 unsigned long lr_timeout; 1853 }; 1854 1855 struct ext4_features { 1856 struct kobject f_kobj; 1857 struct completion f_kobj_unregister; 1858 }; 1859 1860 /* 1861 * This structure will be used for multiple mount protection. It will be 1862 * written into the block number saved in the s_mmp_block field in the 1863 * superblock. Programs that check MMP should assume that if 1864 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 1865 * to use the filesystem, regardless of how old the timestamp is. 1866 */ 1867 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 1868 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 1869 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 1870 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 1871 1872 struct mmp_struct { 1873 __le32 mmp_magic; /* Magic number for MMP */ 1874 __le32 mmp_seq; /* Sequence no. updated periodically */ 1875 1876 /* 1877 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 1878 * purposes and do not affect the correctness of the algorithm 1879 */ 1880 __le64 mmp_time; /* Time last updated */ 1881 char mmp_nodename[64]; /* Node which last updated MMP block */ 1882 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 1883 1884 /* 1885 * mmp_check_interval is used to verify if the MMP block has been 1886 * updated on the block device. The value is updated based on the 1887 * maximum time to write the MMP block during an update cycle. 1888 */ 1889 __le16 mmp_check_interval; 1890 1891 __le16 mmp_pad1; 1892 __le32 mmp_pad2[226]; 1893 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 1894 }; 1895 1896 /* arguments passed to the mmp thread */ 1897 struct mmpd_data { 1898 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 1899 struct super_block *sb; /* super block of the fs */ 1900 }; 1901 1902 /* 1903 * Check interval multiplier 1904 * The MMP block is written every update interval and initially checked every 1905 * update interval x the multiplier (the value is then adapted based on the 1906 * write latency). The reason is that writes can be delayed under load and we 1907 * don't want readers to incorrectly assume that the filesystem is no longer 1908 * in use. 1909 */ 1910 #define EXT4_MMP_CHECK_MULT 2UL 1911 1912 /* 1913 * Minimum interval for MMP checking in seconds. 1914 */ 1915 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 1916 1917 /* 1918 * Maximum interval for MMP checking in seconds. 1919 */ 1920 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 1921 1922 /* 1923 * Function prototypes 1924 */ 1925 1926 /* 1927 * Ok, these declarations are also in <linux/kernel.h> but none of the 1928 * ext4 source programs needs to include it so they are duplicated here. 1929 */ 1930 # define NORET_TYPE /**/ 1931 # define ATTRIB_NORET __attribute__((noreturn)) 1932 # define NORET_AND noreturn, 1933 1934 /* bitmap.c */ 1935 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 1936 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 1937 struct ext4_group_desc *gdp, 1938 struct buffer_head *bh, int sz); 1939 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 1940 struct ext4_group_desc *gdp, 1941 struct buffer_head *bh, int sz); 1942 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 1943 struct ext4_group_desc *gdp, 1944 struct buffer_head *bh); 1945 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 1946 struct ext4_group_desc *gdp, 1947 struct buffer_head *bh); 1948 1949 /* balloc.c */ 1950 extern void ext4_get_group_no_and_offset(struct super_block *sb, 1951 ext4_fsblk_t blocknr, 1952 ext4_group_t *blockgrpp, 1953 ext4_grpblk_t *offsetp); 1954 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 1955 ext4_fsblk_t block); 1956 1957 extern unsigned int ext4_block_group(struct super_block *sb, 1958 ext4_fsblk_t blocknr); 1959 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 1960 ext4_fsblk_t blocknr); 1961 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 1962 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 1963 ext4_group_t group); 1964 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 1965 ext4_fsblk_t goal, 1966 unsigned int flags, 1967 unsigned long *count, 1968 int *errp); 1969 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 1970 s64 nclusters, unsigned int flags); 1971 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 1972 extern void ext4_check_blocks_bitmap(struct super_block *); 1973 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 1974 ext4_group_t block_group, 1975 struct buffer_head ** bh); 1976 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1977 1978 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 1979 ext4_group_t block_group); 1980 extern int ext4_wait_block_bitmap(struct super_block *sb, 1981 ext4_group_t block_group, 1982 struct buffer_head *bh); 1983 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 1984 ext4_group_t block_group); 1985 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 1986 ext4_group_t block_group, 1987 struct ext4_group_desc *gdp); 1988 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 1989 1990 /* dir.c */ 1991 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 1992 struct file *, 1993 struct ext4_dir_entry_2 *, 1994 struct buffer_head *, char *, int, 1995 unsigned int); 1996 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 1997 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 1998 (de), (bh), (buf), (size), (offset))) 1999 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2000 __u32 minor_hash, 2001 struct ext4_dir_entry_2 *dirent); 2002 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2003 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2004 struct buffer_head *bh, 2005 void *buf, int buf_size, 2006 const char *name, int namelen, 2007 struct ext4_dir_entry_2 **dest_de); 2008 void ext4_insert_dentry(struct inode *inode, 2009 struct ext4_dir_entry_2 *de, 2010 int buf_size, 2011 const char *name, int namelen); 2012 static inline void ext4_update_dx_flag(struct inode *inode) 2013 { 2014 if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb, 2015 EXT4_FEATURE_COMPAT_DIR_INDEX)) 2016 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2017 } 2018 static unsigned char ext4_filetype_table[] = { 2019 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2020 }; 2021 2022 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2023 { 2024 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE) || 2025 (filetype >= EXT4_FT_MAX)) 2026 return DT_UNKNOWN; 2027 2028 return ext4_filetype_table[filetype]; 2029 } 2030 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2031 void *buf, int buf_size); 2032 2033 /* fsync.c */ 2034 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2035 2036 /* hash.c */ 2037 extern int ext4fs_dirhash(const char *name, int len, struct 2038 dx_hash_info *hinfo); 2039 2040 /* ialloc.c */ 2041 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2042 const struct qstr *qstr, __u32 goal, 2043 uid_t *owner, int handle_type, 2044 unsigned int line_no, int nblocks); 2045 2046 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \ 2047 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2048 0, 0, 0) 2049 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2050 type, nblocks) \ 2051 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2052 (type), __LINE__, (nblocks)) 2053 2054 2055 extern void ext4_free_inode(handle_t *, struct inode *); 2056 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2057 extern unsigned long ext4_count_free_inodes(struct super_block *); 2058 extern unsigned long ext4_count_dirs(struct super_block *); 2059 extern void ext4_check_inodes_bitmap(struct super_block *); 2060 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2061 extern int ext4_init_inode_table(struct super_block *sb, 2062 ext4_group_t group, int barrier); 2063 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2064 2065 /* mballoc.c */ 2066 extern long ext4_mb_stats; 2067 extern long ext4_mb_max_to_scan; 2068 extern int ext4_mb_init(struct super_block *); 2069 extern int ext4_mb_release(struct super_block *); 2070 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2071 struct ext4_allocation_request *, int *); 2072 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2073 extern void ext4_discard_preallocations(struct inode *); 2074 extern int __init ext4_init_mballoc(void); 2075 extern void ext4_exit_mballoc(void); 2076 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2077 struct buffer_head *bh, ext4_fsblk_t block, 2078 unsigned long count, int flags); 2079 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2080 ext4_group_t ngroups); 2081 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2082 ext4_group_t i, struct ext4_group_desc *desc); 2083 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2084 ext4_fsblk_t block, unsigned long count); 2085 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2086 2087 /* inode.c */ 2088 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2089 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2090 int ext4_get_block_write(struct inode *inode, sector_t iblock, 2091 struct buffer_head *bh_result, int create); 2092 int ext4_get_block(struct inode *inode, sector_t iblock, 2093 struct buffer_head *bh_result, int create); 2094 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2095 struct buffer_head *bh, int create); 2096 int ext4_walk_page_buffers(handle_t *handle, 2097 struct buffer_head *head, 2098 unsigned from, 2099 unsigned to, 2100 int *partial, 2101 int (*fn)(handle_t *handle, 2102 struct buffer_head *bh)); 2103 int do_journal_get_write_access(handle_t *handle, 2104 struct buffer_head *bh); 2105 #define FALL_BACK_TO_NONDELALLOC 1 2106 #define CONVERT_INLINE_DATA 2 2107 2108 extern struct inode *ext4_iget(struct super_block *, unsigned long); 2109 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2110 extern int ext4_setattr(struct dentry *, struct iattr *); 2111 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 2112 struct kstat *stat); 2113 extern void ext4_evict_inode(struct inode *); 2114 extern void ext4_clear_inode(struct inode *); 2115 extern int ext4_sync_inode(handle_t *, struct inode *); 2116 extern void ext4_dirty_inode(struct inode *, int); 2117 extern int ext4_change_inode_journal_flag(struct inode *, int); 2118 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2119 extern int ext4_inode_attach_jinode(struct inode *inode); 2120 extern int ext4_can_truncate(struct inode *inode); 2121 extern void ext4_truncate(struct inode *); 2122 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2123 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 2124 extern void ext4_set_inode_flags(struct inode *); 2125 extern void ext4_get_inode_flags(struct ext4_inode_info *); 2126 extern int ext4_alloc_da_blocks(struct inode *inode); 2127 extern void ext4_set_aops(struct inode *inode); 2128 extern int ext4_writepage_trans_blocks(struct inode *); 2129 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2130 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2131 loff_t lstart, loff_t lend); 2132 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 2133 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2134 extern void ext4_da_update_reserve_space(struct inode *inode, 2135 int used, int quota_claim); 2136 2137 /* indirect.c */ 2138 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2139 struct ext4_map_blocks *map, int flags); 2140 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb, 2141 struct iov_iter *iter, loff_t offset); 2142 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2143 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2144 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2145 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2146 ext4_lblk_t start, ext4_lblk_t end); 2147 2148 /* ioctl.c */ 2149 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2150 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2151 2152 /* migrate.c */ 2153 extern int ext4_ext_migrate(struct inode *); 2154 extern int ext4_ind_migrate(struct inode *inode); 2155 2156 /* namei.c */ 2157 extern int ext4_dirent_csum_verify(struct inode *inode, 2158 struct ext4_dir_entry *dirent); 2159 extern int ext4_orphan_add(handle_t *, struct inode *); 2160 extern int ext4_orphan_del(handle_t *, struct inode *); 2161 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2162 __u32 start_minor_hash, __u32 *next_hash); 2163 extern int search_dir(struct buffer_head *bh, 2164 char *search_buf, 2165 int buf_size, 2166 struct inode *dir, 2167 const struct qstr *d_name, 2168 unsigned int offset, 2169 struct ext4_dir_entry_2 **res_dir); 2170 extern int ext4_generic_delete_entry(handle_t *handle, 2171 struct inode *dir, 2172 struct ext4_dir_entry_2 *de_del, 2173 struct buffer_head *bh, 2174 void *entry_buf, 2175 int buf_size, 2176 int csum_size); 2177 2178 /* resize.c */ 2179 extern int ext4_group_add(struct super_block *sb, 2180 struct ext4_new_group_data *input); 2181 extern int ext4_group_extend(struct super_block *sb, 2182 struct ext4_super_block *es, 2183 ext4_fsblk_t n_blocks_count); 2184 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2185 2186 /* super.c */ 2187 extern int ext4_calculate_overhead(struct super_block *sb); 2188 extern void ext4_superblock_csum_set(struct super_block *sb); 2189 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 2190 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 2191 extern void ext4_kvfree(void *ptr); 2192 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2193 ext4_group_t ngroup); 2194 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2195 char nbuf[16]); 2196 2197 extern __printf(4, 5) 2198 void __ext4_error(struct super_block *, const char *, unsigned int, 2199 const char *, ...); 2200 extern __printf(5, 6) 2201 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2202 const char *, ...); 2203 extern __printf(5, 6) 2204 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2205 const char *, ...); 2206 extern void __ext4_std_error(struct super_block *, const char *, 2207 unsigned int, int); 2208 extern __printf(4, 5) 2209 void __ext4_abort(struct super_block *, const char *, unsigned int, 2210 const char *, ...); 2211 extern __printf(4, 5) 2212 void __ext4_warning(struct super_block *, const char *, unsigned int, 2213 const char *, ...); 2214 extern __printf(3, 4) 2215 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2216 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2217 const char *, unsigned int, const char *); 2218 extern __printf(7, 8) 2219 void __ext4_grp_locked_error(const char *, unsigned int, 2220 struct super_block *, ext4_group_t, 2221 unsigned long, ext4_fsblk_t, 2222 const char *, ...); 2223 2224 #ifdef CONFIG_PRINTK 2225 2226 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2227 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__) 2228 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2229 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2230 #define ext4_error(sb, fmt, ...) \ 2231 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2232 #define ext4_abort(sb, fmt, ...) \ 2233 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2234 #define ext4_warning(sb, fmt, ...) \ 2235 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2236 #define ext4_msg(sb, level, fmt, ...) \ 2237 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 2238 #define dump_mmp_msg(sb, mmp, msg) \ 2239 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 2240 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2241 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 2242 fmt, ##__VA_ARGS__) 2243 2244 #else 2245 2246 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2247 do { \ 2248 no_printk(fmt, ##__VA_ARGS__); \ 2249 __ext4_error_inode(inode, "", 0, block, " "); \ 2250 } while (0) 2251 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2252 do { \ 2253 no_printk(fmt, ##__VA_ARGS__); \ 2254 __ext4_error_file(file, "", 0, block, " "); \ 2255 } while (0) 2256 #define ext4_error(sb, fmt, ...) \ 2257 do { \ 2258 no_printk(fmt, ##__VA_ARGS__); \ 2259 __ext4_error(sb, "", 0, " "); \ 2260 } while (0) 2261 #define ext4_abort(sb, fmt, ...) \ 2262 do { \ 2263 no_printk(fmt, ##__VA_ARGS__); \ 2264 __ext4_abort(sb, "", 0, " "); \ 2265 } while (0) 2266 #define ext4_warning(sb, fmt, ...) \ 2267 do { \ 2268 no_printk(fmt, ##__VA_ARGS__); \ 2269 __ext4_warning(sb, "", 0, " "); \ 2270 } while (0) 2271 #define ext4_msg(sb, level, fmt, ...) \ 2272 do { \ 2273 no_printk(fmt, ##__VA_ARGS__); \ 2274 __ext4_msg(sb, "", " "); \ 2275 } while (0) 2276 #define dump_mmp_msg(sb, mmp, msg) \ 2277 __dump_mmp_msg(sb, mmp, "", 0, "") 2278 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2279 do { \ 2280 no_printk(fmt, ##__VA_ARGS__); \ 2281 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 2282 } while (0) 2283 2284 #endif 2285 2286 extern void ext4_update_dynamic_rev(struct super_block *sb); 2287 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2288 __u32 compat); 2289 extern int ext4_update_rocompat_feature(handle_t *handle, 2290 struct super_block *sb, __u32 rocompat); 2291 extern int ext4_update_incompat_feature(handle_t *handle, 2292 struct super_block *sb, __u32 incompat); 2293 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2294 struct ext4_group_desc *bg); 2295 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2296 struct ext4_group_desc *bg); 2297 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2298 struct ext4_group_desc *bg); 2299 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2300 struct ext4_group_desc *bg); 2301 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2302 struct ext4_group_desc *bg); 2303 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2304 struct ext4_group_desc *bg); 2305 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2306 struct ext4_group_desc *bg); 2307 extern void ext4_block_bitmap_set(struct super_block *sb, 2308 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2309 extern void ext4_inode_bitmap_set(struct super_block *sb, 2310 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2311 extern void ext4_inode_table_set(struct super_block *sb, 2312 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2313 extern void ext4_free_group_clusters_set(struct super_block *sb, 2314 struct ext4_group_desc *bg, 2315 __u32 count); 2316 extern void ext4_free_inodes_set(struct super_block *sb, 2317 struct ext4_group_desc *bg, __u32 count); 2318 extern void ext4_used_dirs_set(struct super_block *sb, 2319 struct ext4_group_desc *bg, __u32 count); 2320 extern void ext4_itable_unused_set(struct super_block *sb, 2321 struct ext4_group_desc *bg, __u32 count); 2322 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2323 struct ext4_group_desc *gdp); 2324 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2325 struct ext4_group_desc *gdp); 2326 extern int ext4_register_li_request(struct super_block *sb, 2327 ext4_group_t first_not_zeroed); 2328 2329 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2330 { 2331 return EXT4_HAS_RO_COMPAT_FEATURE(sb, 2332 EXT4_FEATURE_RO_COMPAT_GDT_CSUM | 2333 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM); 2334 } 2335 2336 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2337 { 2338 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2339 le32_to_cpu(es->s_blocks_count_lo); 2340 } 2341 2342 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2343 { 2344 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2345 le32_to_cpu(es->s_r_blocks_count_lo); 2346 } 2347 2348 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2349 { 2350 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2351 le32_to_cpu(es->s_free_blocks_count_lo); 2352 } 2353 2354 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2355 ext4_fsblk_t blk) 2356 { 2357 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2358 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2359 } 2360 2361 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2362 ext4_fsblk_t blk) 2363 { 2364 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2365 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2366 } 2367 2368 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2369 ext4_fsblk_t blk) 2370 { 2371 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2372 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2373 } 2374 2375 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 2376 { 2377 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2378 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2379 le32_to_cpu(raw_inode->i_size_lo); 2380 else 2381 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2382 } 2383 2384 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2385 { 2386 raw_inode->i_size_lo = cpu_to_le32(i_size); 2387 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2388 } 2389 2390 static inline 2391 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2392 ext4_group_t group) 2393 { 2394 struct ext4_group_info ***grp_info; 2395 long indexv, indexh; 2396 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 2397 grp_info = EXT4_SB(sb)->s_group_info; 2398 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2399 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2400 return grp_info[indexv][indexh]; 2401 } 2402 2403 /* 2404 * Reading s_groups_count requires using smp_rmb() afterwards. See 2405 * the locking protocol documented in the comments of ext4_group_add() 2406 * in resize.c 2407 */ 2408 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2409 { 2410 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2411 2412 smp_rmb(); 2413 return ngroups; 2414 } 2415 2416 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2417 ext4_group_t block_group) 2418 { 2419 return block_group >> sbi->s_log_groups_per_flex; 2420 } 2421 2422 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2423 { 2424 return 1 << sbi->s_log_groups_per_flex; 2425 } 2426 2427 #define ext4_std_error(sb, errno) \ 2428 do { \ 2429 if ((errno)) \ 2430 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2431 } while (0) 2432 2433 #ifdef CONFIG_SMP 2434 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2435 * counters. So we need to make sure we have free clusters more 2436 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2437 */ 2438 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2439 #else 2440 #define EXT4_FREECLUSTERS_WATERMARK 0 2441 #endif 2442 2443 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 2444 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2445 { 2446 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 2447 !mutex_is_locked(&inode->i_mutex)); 2448 down_write(&EXT4_I(inode)->i_data_sem); 2449 if (newsize > EXT4_I(inode)->i_disksize) 2450 EXT4_I(inode)->i_disksize = newsize; 2451 up_write(&EXT4_I(inode)->i_data_sem); 2452 } 2453 2454 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 2455 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 2456 { 2457 int changed = 0; 2458 2459 if (newsize > inode->i_size) { 2460 i_size_write(inode, newsize); 2461 changed = 1; 2462 } 2463 if (newsize > EXT4_I(inode)->i_disksize) { 2464 ext4_update_i_disksize(inode, newsize); 2465 changed |= 2; 2466 } 2467 return changed; 2468 } 2469 2470 struct ext4_group_info { 2471 unsigned long bb_state; 2472 struct rb_root bb_free_root; 2473 ext4_grpblk_t bb_first_free; /* first free block */ 2474 ext4_grpblk_t bb_free; /* total free blocks */ 2475 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 2476 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 2477 struct list_head bb_prealloc_list; 2478 #ifdef DOUBLE_CHECK 2479 void *bb_bitmap; 2480 #endif 2481 struct rw_semaphore alloc_sem; 2482 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2483 * regions, index is order. 2484 * bb_counters[3] = 5 means 2485 * 5 free 8-block regions. */ 2486 }; 2487 2488 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 2489 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 2490 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 2491 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 2492 2493 #define EXT4_MB_GRP_NEED_INIT(grp) \ 2494 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 2495 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 2496 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2497 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 2498 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2499 2500 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 2501 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2502 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 2503 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2504 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 2505 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2506 2507 #define EXT4_MAX_CONTENTION 8 2508 #define EXT4_CONTENTION_THRESHOLD 2 2509 2510 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2511 ext4_group_t group) 2512 { 2513 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2514 } 2515 2516 /* 2517 * Returns true if the filesystem is busy enough that attempts to 2518 * access the block group locks has run into contention. 2519 */ 2520 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 2521 { 2522 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 2523 } 2524 2525 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 2526 { 2527 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 2528 if (spin_trylock(lock)) 2529 /* 2530 * We're able to grab the lock right away, so drop the 2531 * lock contention counter. 2532 */ 2533 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 2534 else { 2535 /* 2536 * The lock is busy, so bump the contention counter, 2537 * and then wait on the spin lock. 2538 */ 2539 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 2540 EXT4_MAX_CONTENTION); 2541 spin_lock(lock); 2542 } 2543 } 2544 2545 static inline void ext4_unlock_group(struct super_block *sb, 2546 ext4_group_t group) 2547 { 2548 spin_unlock(ext4_group_lock_ptr(sb, group)); 2549 } 2550 2551 /* 2552 * Block validity checking 2553 */ 2554 #define ext4_check_indirect_blockref(inode, bh) \ 2555 ext4_check_blockref(__func__, __LINE__, inode, \ 2556 (__le32 *)(bh)->b_data, \ 2557 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 2558 2559 #define ext4_ind_check_inode(inode) \ 2560 ext4_check_blockref(__func__, __LINE__, inode, \ 2561 EXT4_I(inode)->i_data, \ 2562 EXT4_NDIR_BLOCKS) 2563 2564 /* 2565 * Inodes and files operations 2566 */ 2567 2568 /* dir.c */ 2569 extern const struct file_operations ext4_dir_operations; 2570 2571 /* file.c */ 2572 extern const struct inode_operations ext4_file_inode_operations; 2573 extern const struct file_operations ext4_file_operations; 2574 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 2575 2576 /* inline.c */ 2577 extern int ext4_get_max_inline_size(struct inode *inode); 2578 extern int ext4_find_inline_data_nolock(struct inode *inode); 2579 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 2580 unsigned int len); 2581 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 2582 2583 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 2584 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 2585 struct inode *inode, 2586 loff_t pos, unsigned len, 2587 unsigned flags, 2588 struct page **pagep); 2589 extern int ext4_write_inline_data_end(struct inode *inode, 2590 loff_t pos, unsigned len, 2591 unsigned copied, 2592 struct page *page); 2593 extern struct buffer_head * 2594 ext4_journalled_write_inline_data(struct inode *inode, 2595 unsigned len, 2596 struct page *page); 2597 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 2598 struct inode *inode, 2599 loff_t pos, unsigned len, 2600 unsigned flags, 2601 struct page **pagep, 2602 void **fsdata); 2603 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 2604 unsigned len, unsigned copied, 2605 struct page *page); 2606 extern int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry, 2607 struct inode *inode); 2608 extern int ext4_try_create_inline_dir(handle_t *handle, 2609 struct inode *parent, 2610 struct inode *inode); 2611 extern int ext4_read_inline_dir(struct file *filp, 2612 struct dir_context *ctx, 2613 int *has_inline_data); 2614 extern int htree_inlinedir_to_tree(struct file *dir_file, 2615 struct inode *dir, ext4_lblk_t block, 2616 struct dx_hash_info *hinfo, 2617 __u32 start_hash, __u32 start_minor_hash, 2618 int *has_inline_data); 2619 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 2620 const struct qstr *d_name, 2621 struct ext4_dir_entry_2 **res_dir, 2622 int *has_inline_data); 2623 extern int ext4_delete_inline_entry(handle_t *handle, 2624 struct inode *dir, 2625 struct ext4_dir_entry_2 *de_del, 2626 struct buffer_head *bh, 2627 int *has_inline_data); 2628 extern int empty_inline_dir(struct inode *dir, int *has_inline_data); 2629 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 2630 struct ext4_dir_entry_2 **parent_de, 2631 int *retval); 2632 extern int ext4_inline_data_fiemap(struct inode *inode, 2633 struct fiemap_extent_info *fieinfo, 2634 int *has_inline); 2635 extern int ext4_try_to_evict_inline_data(handle_t *handle, 2636 struct inode *inode, 2637 int needed); 2638 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline); 2639 2640 extern int ext4_convert_inline_data(struct inode *inode); 2641 2642 static inline int ext4_has_inline_data(struct inode *inode) 2643 { 2644 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 2645 EXT4_I(inode)->i_inline_off; 2646 } 2647 2648 /* namei.c */ 2649 extern const struct inode_operations ext4_dir_inode_operations; 2650 extern const struct inode_operations ext4_special_inode_operations; 2651 extern struct dentry *ext4_get_parent(struct dentry *child); 2652 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 2653 struct ext4_dir_entry_2 *de, 2654 int blocksize, int csum_size, 2655 unsigned int parent_ino, int dotdot_real_len); 2656 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t, 2657 unsigned int blocksize); 2658 extern int ext4_handle_dirty_dirent_node(handle_t *handle, 2659 struct inode *inode, 2660 struct buffer_head *bh); 2661 #define S_SHIFT 12 2662 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = { 2663 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 2664 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 2665 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 2666 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 2667 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 2668 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 2669 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 2670 }; 2671 2672 static inline void ext4_set_de_type(struct super_block *sb, 2673 struct ext4_dir_entry_2 *de, 2674 umode_t mode) { 2675 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE)) 2676 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 2677 } 2678 2679 2680 /* symlink.c */ 2681 extern const struct inode_operations ext4_symlink_inode_operations; 2682 extern const struct inode_operations ext4_fast_symlink_inode_operations; 2683 2684 /* block_validity */ 2685 extern void ext4_release_system_zone(struct super_block *sb); 2686 extern int ext4_setup_system_zone(struct super_block *sb); 2687 extern int __init ext4_init_system_zone(void); 2688 extern void ext4_exit_system_zone(void); 2689 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 2690 ext4_fsblk_t start_blk, 2691 unsigned int count); 2692 extern int ext4_check_blockref(const char *, unsigned int, 2693 struct inode *, __le32 *, unsigned int); 2694 2695 /* extents.c */ 2696 struct ext4_ext_path; 2697 struct ext4_extent; 2698 2699 /* 2700 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 2701 * __le32. 2702 */ 2703 #define EXT_MAX_BLOCKS 0xffffffff 2704 2705 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 2706 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 2707 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 2708 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 2709 struct ext4_map_blocks *map, int flags); 2710 extern void ext4_ext_truncate(handle_t *, struct inode *); 2711 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 2712 ext4_lblk_t end); 2713 extern void ext4_ext_init(struct super_block *); 2714 extern void ext4_ext_release(struct super_block *); 2715 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 2716 loff_t len); 2717 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 2718 loff_t offset, ssize_t len); 2719 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 2720 struct ext4_map_blocks *map, int flags); 2721 extern int ext4_ext_calc_metadata_amount(struct inode *inode, 2722 ext4_lblk_t lblocks); 2723 extern int ext4_extent_tree_init(handle_t *, struct inode *); 2724 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 2725 int num, 2726 struct ext4_ext_path *path); 2727 extern int ext4_can_extents_be_merged(struct inode *inode, 2728 struct ext4_extent *ex1, 2729 struct ext4_extent *ex2); 2730 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 2731 struct ext4_ext_path **, 2732 struct ext4_extent *, int); 2733 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 2734 struct ext4_ext_path **, 2735 int flags); 2736 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 2737 extern int ext4_ext_check_inode(struct inode *inode); 2738 extern int ext4_find_delalloc_range(struct inode *inode, 2739 ext4_lblk_t lblk_start, 2740 ext4_lblk_t lblk_end); 2741 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk); 2742 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 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 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 2748 struct inode *inode2, ext4_lblk_t lblk1, 2749 ext4_lblk_t lblk2, ext4_lblk_t count, 2750 int mark_unwritten,int *err); 2751 2752 /* move_extent.c */ 2753 extern void ext4_double_down_write_data_sem(struct inode *first, 2754 struct inode *second); 2755 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 2756 struct inode *donor_inode); 2757 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 2758 __u64 start_orig, __u64 start_donor, 2759 __u64 len, __u64 *moved_len); 2760 2761 /* page-io.c */ 2762 extern int __init ext4_init_pageio(void); 2763 extern void ext4_exit_pageio(void); 2764 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 2765 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 2766 extern int ext4_put_io_end(ext4_io_end_t *io_end); 2767 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 2768 extern void ext4_io_submit_init(struct ext4_io_submit *io, 2769 struct writeback_control *wbc); 2770 extern void ext4_end_io_rsv_work(struct work_struct *work); 2771 extern void ext4_io_submit(struct ext4_io_submit *io); 2772 extern int ext4_bio_write_page(struct ext4_io_submit *io, 2773 struct page *page, 2774 int len, 2775 struct writeback_control *wbc, 2776 bool keep_towrite); 2777 2778 /* mmp.c */ 2779 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 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