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 #ifdef __KERNEL__ 35 #include <linux/compat.h> 36 #endif 37 38 /* 39 * The fourth extended filesystem constants/structures 40 */ 41 42 /* 43 * Define EXT4FS_DEBUG to produce debug messages 44 */ 45 #undef EXT4FS_DEBUG 46 47 /* 48 * Debug code 49 */ 50 #ifdef EXT4FS_DEBUG 51 #define ext4_debug(f, a...) \ 52 do { \ 53 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 54 __FILE__, __LINE__, __func__); \ 55 printk(KERN_DEBUG f, ## a); \ 56 } while (0) 57 #else 58 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 59 #endif 60 61 /* 62 * Turn on EXT_DEBUG to get lots of info about extents operations. 63 */ 64 #define EXT_DEBUG__ 65 #ifdef EXT_DEBUG 66 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__) 67 #else 68 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 69 #endif 70 71 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 72 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 73 74 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 75 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 76 77 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 78 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 79 80 /* data type for block offset of block group */ 81 typedef int ext4_grpblk_t; 82 83 /* data type for filesystem-wide blocks number */ 84 typedef unsigned long long ext4_fsblk_t; 85 86 /* data type for file logical block number */ 87 typedef __u32 ext4_lblk_t; 88 89 /* data type for block group number */ 90 typedef unsigned int ext4_group_t; 91 92 /* 93 * Flags used in mballoc's allocation_context flags field. 94 * 95 * Also used to show what's going on for debugging purposes when the 96 * flag field is exported via the traceport interface 97 */ 98 99 /* prefer goal again. length */ 100 #define EXT4_MB_HINT_MERGE 0x0001 101 /* blocks already reserved */ 102 #define EXT4_MB_HINT_RESERVED 0x0002 103 /* metadata is being allocated */ 104 #define EXT4_MB_HINT_METADATA 0x0004 105 /* first blocks in the file */ 106 #define EXT4_MB_HINT_FIRST 0x0008 107 /* search for the best chunk */ 108 #define EXT4_MB_HINT_BEST 0x0010 109 /* data is being allocated */ 110 #define EXT4_MB_HINT_DATA 0x0020 111 /* don't preallocate (for tails) */ 112 #define EXT4_MB_HINT_NOPREALLOC 0x0040 113 /* allocate for locality group */ 114 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 115 /* allocate goal blocks or none */ 116 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 117 /* goal is meaningful */ 118 #define EXT4_MB_HINT_TRY_GOAL 0x0200 119 /* blocks already pre-reserved by delayed allocation */ 120 #define EXT4_MB_DELALLOC_RESERVED 0x0400 121 /* We are doing stream allocation */ 122 #define EXT4_MB_STREAM_ALLOC 0x0800 123 /* Use reserved root blocks if needed */ 124 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 125 /* Use blocks from reserved pool */ 126 #define EXT4_MB_USE_RESERVED 0x2000 127 128 struct ext4_allocation_request { 129 /* target inode for block we're allocating */ 130 struct inode *inode; 131 /* how many blocks we want to allocate */ 132 unsigned int len; 133 /* logical block in target inode */ 134 ext4_lblk_t logical; 135 /* the closest logical allocated block to the left */ 136 ext4_lblk_t lleft; 137 /* the closest logical allocated block to the right */ 138 ext4_lblk_t lright; 139 /* phys. target (a hint) */ 140 ext4_fsblk_t goal; 141 /* phys. block for the closest logical allocated block to the left */ 142 ext4_fsblk_t pleft; 143 /* phys. block for the closest logical allocated block to the right */ 144 ext4_fsblk_t pright; 145 /* flags. see above EXT4_MB_HINT_* */ 146 unsigned int flags; 147 }; 148 149 /* 150 * Logical to physical block mapping, used by ext4_map_blocks() 151 * 152 * This structure is used to pass requests into ext4_map_blocks() as 153 * well as to store the information returned by ext4_map_blocks(). It 154 * takes less room on the stack than a struct buffer_head. 155 */ 156 #define EXT4_MAP_NEW (1 << BH_New) 157 #define EXT4_MAP_MAPPED (1 << BH_Mapped) 158 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 159 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 160 #define EXT4_MAP_UNINIT (1 << BH_Uninit) 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_UNINIT | EXT4_MAP_FROM_CLUSTER) 172 173 struct ext4_map_blocks { 174 ext4_fsblk_t m_pblk; 175 ext4_lblk_t m_lblk; 176 unsigned int m_len; 177 unsigned int m_flags; 178 }; 179 180 /* 181 * Flags for ext4_io_end->flags 182 */ 183 #define EXT4_IO_END_UNWRITTEN 0x0001 184 185 /* 186 * For converting uninitialized extents on a work queue. 'handle' is used for 187 * buffered writeback. 188 */ 189 typedef struct ext4_io_end { 190 struct list_head list; /* per-file finished IO list */ 191 handle_t *handle; /* handle reserved for extent 192 * conversion */ 193 struct inode *inode; /* file being written to */ 194 struct bio *bio; /* Linked list of completed 195 * bios covering the extent */ 196 unsigned int flag; /* unwritten or not */ 197 loff_t offset; /* offset in the file */ 198 ssize_t size; /* size of the extent */ 199 atomic_t count; /* reference counter */ 200 } ext4_io_end_t; 201 202 struct ext4_io_submit { 203 int io_op; 204 struct bio *io_bio; 205 ext4_io_end_t *io_end; 206 sector_t io_next_block; 207 }; 208 209 /* 210 * Special inodes numbers 211 */ 212 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 213 #define EXT4_ROOT_INO 2 /* Root inode */ 214 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 215 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 216 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 217 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 218 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 219 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 220 221 /* First non-reserved inode for old ext4 filesystems */ 222 #define EXT4_GOOD_OLD_FIRST_INO 11 223 224 /* 225 * Maximal count of links to a file 226 */ 227 #define EXT4_LINK_MAX 65000 228 229 /* 230 * Macro-instructions used to manage several block sizes 231 */ 232 #define EXT4_MIN_BLOCK_SIZE 1024 233 #define EXT4_MAX_BLOCK_SIZE 65536 234 #define EXT4_MIN_BLOCK_LOG_SIZE 10 235 #define EXT4_MAX_BLOCK_LOG_SIZE 16 236 #ifdef __KERNEL__ 237 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 238 #else 239 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 240 #endif 241 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 242 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 243 EXT4_SB(s)->s_cluster_bits) 244 #ifdef __KERNEL__ 245 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 246 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 247 #else 248 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 249 #endif 250 #ifdef __KERNEL__ 251 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 252 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 253 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 254 #else 255 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 256 EXT4_GOOD_OLD_INODE_SIZE : \ 257 (s)->s_inode_size) 258 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 259 EXT4_GOOD_OLD_FIRST_INO : \ 260 (s)->s_first_ino) 261 #endif 262 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 263 264 /* Translate a block number to a cluster number */ 265 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 266 /* Translate a cluster number to a block number */ 267 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 268 /* Translate # of blks to # of clusters */ 269 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 270 (sbi)->s_cluster_bits) 271 272 /* 273 * Structure of a blocks group descriptor 274 */ 275 struct ext4_group_desc 276 { 277 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 278 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 279 __le32 bg_inode_table_lo; /* Inodes table block */ 280 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 281 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 282 __le16 bg_used_dirs_count_lo; /* Directories count */ 283 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 284 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 285 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 286 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 287 __le16 bg_itable_unused_lo; /* Unused inodes count */ 288 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 289 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 290 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 291 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 292 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 293 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 294 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 295 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 296 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 297 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 298 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 299 __u32 bg_reserved; 300 }; 301 302 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 303 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 304 sizeof(__le16)) 305 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 306 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 307 sizeof(__le16)) 308 309 /* 310 * Structure of a flex block group info 311 */ 312 313 struct flex_groups { 314 atomic64_t free_clusters; 315 atomic_t free_inodes; 316 atomic_t used_dirs; 317 }; 318 319 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 320 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 321 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 322 323 /* 324 * Macro-instructions used to manage group descriptors 325 */ 326 #define EXT4_MIN_DESC_SIZE 32 327 #define EXT4_MIN_DESC_SIZE_64BIT 64 328 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 329 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 330 #ifdef __KERNEL__ 331 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 332 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 333 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 334 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 335 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 336 #else 337 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 338 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 339 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 340 #endif 341 342 /* 343 * Constants relative to the data blocks 344 */ 345 #define EXT4_NDIR_BLOCKS 12 346 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 347 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 348 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 349 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 350 351 /* 352 * Inode flags 353 */ 354 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 355 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 356 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 357 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 358 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 359 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 360 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 361 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 362 /* Reserved for compression usage... */ 363 #define EXT4_DIRTY_FL 0x00000100 364 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 365 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 366 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 367 /* End compression flags --- maybe not all used */ 368 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 369 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 370 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 371 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 372 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 373 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 374 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 375 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 376 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 377 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 378 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 379 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 380 381 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 382 #define EXT4_FL_USER_MODIFIABLE 0x004380FF /* User modifiable flags */ 383 384 /* Flags that should be inherited by new inodes from their parent. */ 385 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 386 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 387 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 388 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 389 390 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 391 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 392 393 /* Flags that are appropriate for non-directories/regular files. */ 394 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 395 396 /* Mask out flags that are inappropriate for the given type of inode. */ 397 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 398 { 399 if (S_ISDIR(mode)) 400 return flags; 401 else if (S_ISREG(mode)) 402 return flags & EXT4_REG_FLMASK; 403 else 404 return flags & EXT4_OTHER_FLMASK; 405 } 406 407 /* 408 * Inode flags used for atomic set/get 409 */ 410 enum { 411 EXT4_INODE_SECRM = 0, /* Secure deletion */ 412 EXT4_INODE_UNRM = 1, /* Undelete */ 413 EXT4_INODE_COMPR = 2, /* Compress file */ 414 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 415 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 416 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 417 EXT4_INODE_NODUMP = 6, /* do not dump file */ 418 EXT4_INODE_NOATIME = 7, /* do not update atime */ 419 /* Reserved for compression usage... */ 420 EXT4_INODE_DIRTY = 8, 421 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 422 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 423 EXT4_INODE_ECOMPR = 11, /* Compression error */ 424 /* End compression flags --- maybe not all used */ 425 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 426 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 427 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 428 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 429 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 430 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 431 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 432 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 433 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 434 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 435 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 436 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 437 }; 438 439 /* 440 * Since it's pretty easy to mix up bit numbers and hex values, we use a 441 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 442 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 443 * any extra space in the compiled kernel image, otherwise, the build will fail. 444 * It's important that these values are the same, since we are using 445 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 446 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 447 * values found in ext2, ext3 and ext4 filesystems, and of course the values 448 * defined in e2fsprogs. 449 * 450 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 451 */ 452 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 453 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 454 455 static inline void ext4_check_flag_values(void) 456 { 457 CHECK_FLAG_VALUE(SECRM); 458 CHECK_FLAG_VALUE(UNRM); 459 CHECK_FLAG_VALUE(COMPR); 460 CHECK_FLAG_VALUE(SYNC); 461 CHECK_FLAG_VALUE(IMMUTABLE); 462 CHECK_FLAG_VALUE(APPEND); 463 CHECK_FLAG_VALUE(NODUMP); 464 CHECK_FLAG_VALUE(NOATIME); 465 CHECK_FLAG_VALUE(DIRTY); 466 CHECK_FLAG_VALUE(COMPRBLK); 467 CHECK_FLAG_VALUE(NOCOMPR); 468 CHECK_FLAG_VALUE(ECOMPR); 469 CHECK_FLAG_VALUE(INDEX); 470 CHECK_FLAG_VALUE(IMAGIC); 471 CHECK_FLAG_VALUE(JOURNAL_DATA); 472 CHECK_FLAG_VALUE(NOTAIL); 473 CHECK_FLAG_VALUE(DIRSYNC); 474 CHECK_FLAG_VALUE(TOPDIR); 475 CHECK_FLAG_VALUE(HUGE_FILE); 476 CHECK_FLAG_VALUE(EXTENTS); 477 CHECK_FLAG_VALUE(EA_INODE); 478 CHECK_FLAG_VALUE(EOFBLOCKS); 479 CHECK_FLAG_VALUE(INLINE_DATA); 480 CHECK_FLAG_VALUE(RESERVED); 481 } 482 483 /* Used to pass group descriptor data when online resize is done */ 484 struct ext4_new_group_input { 485 __u32 group; /* Group number for this data */ 486 __u64 block_bitmap; /* Absolute block number of block bitmap */ 487 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 488 __u64 inode_table; /* Absolute block number of inode table start */ 489 __u32 blocks_count; /* Total number of blocks in this group */ 490 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 491 __u16 unused; 492 }; 493 494 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 495 struct compat_ext4_new_group_input { 496 u32 group; 497 compat_u64 block_bitmap; 498 compat_u64 inode_bitmap; 499 compat_u64 inode_table; 500 u32 blocks_count; 501 u16 reserved_blocks; 502 u16 unused; 503 }; 504 #endif 505 506 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 507 struct ext4_new_group_data { 508 __u32 group; 509 __u64 block_bitmap; 510 __u64 inode_bitmap; 511 __u64 inode_table; 512 __u32 blocks_count; 513 __u16 reserved_blocks; 514 __u16 unused; 515 __u32 free_blocks_count; 516 }; 517 518 /* Indexes used to index group tables in ext4_new_group_data */ 519 enum { 520 BLOCK_BITMAP = 0, /* block bitmap */ 521 INODE_BITMAP, /* inode bitmap */ 522 INODE_TABLE, /* inode tables */ 523 GROUP_TABLE_COUNT, 524 }; 525 526 /* 527 * Flags used by ext4_map_blocks() 528 */ 529 /* Allocate any needed blocks and/or convert an unitialized 530 extent to be an initialized ext4 */ 531 #define EXT4_GET_BLOCKS_CREATE 0x0001 532 /* Request the creation of an unitialized extent */ 533 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 534 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ 535 EXT4_GET_BLOCKS_CREATE) 536 /* Caller is from the delayed allocation writeout path 537 * finally doing the actual allocation of delayed blocks */ 538 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 539 /* caller is from the direct IO path, request to creation of an 540 unitialized extents if not allocated, split the uninitialized 541 extent if blocks has been preallocated already*/ 542 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 543 #define EXT4_GET_BLOCKS_CONVERT 0x0010 544 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 545 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 546 /* Convert extent to initialized after IO complete */ 547 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 548 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 549 /* Eventual metadata allocation (due to growing extent tree) 550 * should not fail, so try to use reserved blocks for that.*/ 551 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 552 /* Don't normalize allocation size (used for fallocate) */ 553 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 554 /* Request will not result in inode size update (user for fallocate) */ 555 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 556 /* Do not take i_data_sem locking in ext4_map_blocks */ 557 #define EXT4_GET_BLOCKS_NO_LOCK 0x0100 558 /* Do not put hole in extent cache */ 559 #define EXT4_GET_BLOCKS_NO_PUT_HOLE 0x0200 560 561 /* 562 * The bit position of these flags must not overlap with any of the 563 * EXT4_GET_BLOCKS_*. They are used by ext4_ext_find_extent(), 564 * read_extent_tree_block(), ext4_split_extent_at(), 565 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 566 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 567 * caching the extents when reading from the extent tree while a 568 * truncate or punch hole operation is in progress. 569 */ 570 #define EXT4_EX_NOCACHE 0x0400 571 #define EXT4_EX_FORCE_CACHE 0x0800 572 573 /* 574 * Flags used by ext4_free_blocks 575 */ 576 #define EXT4_FREE_BLOCKS_METADATA 0x0001 577 #define EXT4_FREE_BLOCKS_FORGET 0x0002 578 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 579 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 580 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 581 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 582 #define EXT4_FREE_BLOCKS_RESERVE 0x0040 583 584 /* 585 * ioctl commands 586 */ 587 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 588 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 589 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 590 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 591 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 592 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 593 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 594 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 595 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 596 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 597 #define EXT4_IOC_MIGRATE _IO('f', 9) 598 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 599 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 600 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 601 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 602 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 603 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 604 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 605 606 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 607 /* 608 * ioctl commands in 32 bit emulation 609 */ 610 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 611 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 612 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 613 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 614 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 615 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 616 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 617 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 618 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 619 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 620 #endif 621 622 /* Max physical block we can address w/o extents */ 623 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 624 625 /* 626 * Structure of an inode on the disk 627 */ 628 struct ext4_inode { 629 __le16 i_mode; /* File mode */ 630 __le16 i_uid; /* Low 16 bits of Owner Uid */ 631 __le32 i_size_lo; /* Size in bytes */ 632 __le32 i_atime; /* Access time */ 633 __le32 i_ctime; /* Inode Change time */ 634 __le32 i_mtime; /* Modification time */ 635 __le32 i_dtime; /* Deletion Time */ 636 __le16 i_gid; /* Low 16 bits of Group Id */ 637 __le16 i_links_count; /* Links count */ 638 __le32 i_blocks_lo; /* Blocks count */ 639 __le32 i_flags; /* File flags */ 640 union { 641 struct { 642 __le32 l_i_version; 643 } linux1; 644 struct { 645 __u32 h_i_translator; 646 } hurd1; 647 struct { 648 __u32 m_i_reserved1; 649 } masix1; 650 } osd1; /* OS dependent 1 */ 651 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 652 __le32 i_generation; /* File version (for NFS) */ 653 __le32 i_file_acl_lo; /* File ACL */ 654 __le32 i_size_high; 655 __le32 i_obso_faddr; /* Obsoleted fragment address */ 656 union { 657 struct { 658 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 659 __le16 l_i_file_acl_high; 660 __le16 l_i_uid_high; /* these 2 fields */ 661 __le16 l_i_gid_high; /* were reserved2[0] */ 662 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 663 __le16 l_i_reserved; 664 } linux2; 665 struct { 666 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 667 __u16 h_i_mode_high; 668 __u16 h_i_uid_high; 669 __u16 h_i_gid_high; 670 __u32 h_i_author; 671 } hurd2; 672 struct { 673 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 674 __le16 m_i_file_acl_high; 675 __u32 m_i_reserved2[2]; 676 } masix2; 677 } osd2; /* OS dependent 2 */ 678 __le16 i_extra_isize; 679 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 680 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 681 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 682 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 683 __le32 i_crtime; /* File Creation time */ 684 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 685 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 686 }; 687 688 struct move_extent { 689 __u32 reserved; /* should be zero */ 690 __u32 donor_fd; /* donor file descriptor */ 691 __u64 orig_start; /* logical start offset in block for orig */ 692 __u64 donor_start; /* logical start offset in block for donor */ 693 __u64 len; /* block length to be moved */ 694 __u64 moved_len; /* moved block length */ 695 }; 696 697 #define EXT4_EPOCH_BITS 2 698 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 699 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 700 701 /* 702 * Extended fields will fit into an inode if the filesystem was formatted 703 * with large inodes (-I 256 or larger) and there are not currently any EAs 704 * consuming all of the available space. For new inodes we always reserve 705 * enough space for the kernel's known extended fields, but for inodes 706 * created with an old kernel this might not have been the case. None of 707 * the extended inode fields is critical for correct filesystem operation. 708 * This macro checks if a certain field fits in the inode. Note that 709 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 710 */ 711 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 712 ((offsetof(typeof(*ext4_inode), field) + \ 713 sizeof((ext4_inode)->field)) \ 714 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 715 (einode)->i_extra_isize)) \ 716 717 static inline __le32 ext4_encode_extra_time(struct timespec *time) 718 { 719 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 720 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | 721 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); 722 } 723 724 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 725 { 726 if (sizeof(time->tv_sec) > 4) 727 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 728 << 32; 729 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 730 } 731 732 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 733 do { \ 734 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 735 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 736 (raw_inode)->xtime ## _extra = \ 737 ext4_encode_extra_time(&(inode)->xtime); \ 738 } while (0) 739 740 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 741 do { \ 742 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 743 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 744 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 745 (raw_inode)->xtime ## _extra = \ 746 ext4_encode_extra_time(&(einode)->xtime); \ 747 } while (0) 748 749 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 750 do { \ 751 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 752 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 753 ext4_decode_extra_time(&(inode)->xtime, \ 754 raw_inode->xtime ## _extra); \ 755 else \ 756 (inode)->xtime.tv_nsec = 0; \ 757 } while (0) 758 759 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 760 do { \ 761 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 762 (einode)->xtime.tv_sec = \ 763 (signed)le32_to_cpu((raw_inode)->xtime); \ 764 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 765 ext4_decode_extra_time(&(einode)->xtime, \ 766 raw_inode->xtime ## _extra); \ 767 else \ 768 (einode)->xtime.tv_nsec = 0; \ 769 } while (0) 770 771 #define i_disk_version osd1.linux1.l_i_version 772 773 #if defined(__KERNEL__) || defined(__linux__) 774 #define i_reserved1 osd1.linux1.l_i_reserved1 775 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 776 #define i_blocks_high osd2.linux2.l_i_blocks_high 777 #define i_uid_low i_uid 778 #define i_gid_low i_gid 779 #define i_uid_high osd2.linux2.l_i_uid_high 780 #define i_gid_high osd2.linux2.l_i_gid_high 781 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 782 783 #elif defined(__GNU__) 784 785 #define i_translator osd1.hurd1.h_i_translator 786 #define i_uid_high osd2.hurd2.h_i_uid_high 787 #define i_gid_high osd2.hurd2.h_i_gid_high 788 #define i_author osd2.hurd2.h_i_author 789 790 #elif defined(__masix__) 791 792 #define i_reserved1 osd1.masix1.m_i_reserved1 793 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 794 #define i_reserved2 osd2.masix2.m_i_reserved2 795 796 #endif /* defined(__KERNEL__) || defined(__linux__) */ 797 798 #include "extents_status.h" 799 800 /* 801 * fourth extended file system inode data in memory 802 */ 803 struct ext4_inode_info { 804 __le32 i_data[15]; /* unconverted */ 805 __u32 i_dtime; 806 ext4_fsblk_t i_file_acl; 807 808 /* 809 * i_block_group is the number of the block group which contains 810 * this file's inode. Constant across the lifetime of the inode, 811 * it is ued for making block allocation decisions - we try to 812 * place a file's data blocks near its inode block, and new inodes 813 * near to their parent directory's inode. 814 */ 815 ext4_group_t i_block_group; 816 ext4_lblk_t i_dir_start_lookup; 817 #if (BITS_PER_LONG < 64) 818 unsigned long i_state_flags; /* Dynamic state flags */ 819 #endif 820 unsigned long i_flags; 821 822 /* 823 * Extended attributes can be read independently of the main file 824 * data. Taking i_mutex even when reading would cause contention 825 * between readers of EAs and writers of regular file data, so 826 * instead we synchronize on xattr_sem when reading or changing 827 * EAs. 828 */ 829 struct rw_semaphore xattr_sem; 830 831 struct list_head i_orphan; /* unlinked but open inodes */ 832 833 /* 834 * i_disksize keeps track of what the inode size is ON DISK, not 835 * in memory. During truncate, i_size is set to the new size by 836 * the VFS prior to calling ext4_truncate(), but the filesystem won't 837 * set i_disksize to 0 until the truncate is actually under way. 838 * 839 * The intent is that i_disksize always represents the blocks which 840 * are used by this file. This allows recovery to restart truncate 841 * on orphans if we crash during truncate. We actually write i_disksize 842 * into the on-disk inode when writing inodes out, instead of i_size. 843 * 844 * The only time when i_disksize and i_size may be different is when 845 * a truncate is in progress. The only things which change i_disksize 846 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 847 */ 848 loff_t i_disksize; 849 850 /* 851 * i_data_sem is for serialising ext4_truncate() against 852 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 853 * data tree are chopped off during truncate. We can't do that in 854 * ext4 because whenever we perform intermediate commits during 855 * truncate, the inode and all the metadata blocks *must* be in a 856 * consistent state which allows truncation of the orphans to restart 857 * during recovery. Hence we must fix the get_block-vs-truncate race 858 * by other means, so we have i_data_sem. 859 */ 860 struct rw_semaphore i_data_sem; 861 struct inode vfs_inode; 862 struct jbd2_inode *jinode; 863 864 /* 865 * File creation time. Its function is same as that of 866 * struct timespec i_{a,c,m}time in the generic inode. 867 */ 868 struct timespec i_crtime; 869 870 /* mballoc */ 871 struct list_head i_prealloc_list; 872 spinlock_t i_prealloc_lock; 873 874 /* extents status tree */ 875 struct ext4_es_tree i_es_tree; 876 rwlock_t i_es_lock; 877 struct list_head i_es_lru; 878 unsigned int i_es_lru_nr; /* protected by i_es_lock */ 879 unsigned long i_touch_when; /* jiffies of last accessing */ 880 881 /* ialloc */ 882 ext4_group_t i_last_alloc_group; 883 884 /* allocation reservation info for delalloc */ 885 /* In case of bigalloc, these refer to clusters rather than blocks */ 886 unsigned int i_reserved_data_blocks; 887 unsigned int i_reserved_meta_blocks; 888 unsigned int i_allocated_meta_blocks; 889 ext4_lblk_t i_da_metadata_calc_last_lblock; 890 int i_da_metadata_calc_len; 891 892 /* on-disk additional length */ 893 __u16 i_extra_isize; 894 895 /* Indicate the inline data space. */ 896 u16 i_inline_off; 897 u16 i_inline_size; 898 899 #ifdef CONFIG_QUOTA 900 /* quota space reservation, managed internally by quota code */ 901 qsize_t i_reserved_quota; 902 #endif 903 904 /* Lock protecting lists below */ 905 spinlock_t i_completed_io_lock; 906 /* 907 * Completed IOs that need unwritten extents handling and have 908 * transaction reserved 909 */ 910 struct list_head i_rsv_conversion_list; 911 /* 912 * Completed IOs that need unwritten extents handling and don't have 913 * transaction reserved 914 */ 915 atomic_t i_ioend_count; /* Number of outstanding io_end structs */ 916 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 917 struct work_struct i_rsv_conversion_work; 918 919 spinlock_t i_block_reservation_lock; 920 921 /* 922 * Transactions that contain inode's metadata needed to complete 923 * fsync and fdatasync, respectively. 924 */ 925 tid_t i_sync_tid; 926 tid_t i_datasync_tid; 927 928 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 929 __u32 i_csum_seed; 930 }; 931 932 /* 933 * File system states 934 */ 935 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 936 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 937 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 938 939 /* 940 * Misc. filesystem flags 941 */ 942 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 943 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 944 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 945 946 /* 947 * Mount flags set via mount options or defaults 948 */ 949 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 950 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 951 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 952 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 953 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 954 #define EXT4_MOUNT_ERRORS_MASK 0x00070 955 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 956 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 957 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 958 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 959 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 960 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 961 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 962 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 963 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 964 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 965 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 966 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 967 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 968 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 969 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 970 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 971 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 972 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 973 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 974 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 975 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 976 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 977 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 978 979 /* 980 * Mount flags set either automatically (could not be set by mount option) 981 * based on per file system feature or property or in special cases such as 982 * distinguishing between explicit mount option definition and default. 983 */ 984 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 985 specified delalloc */ 986 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 987 size of blocksize * 8 988 blocks */ 989 990 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 991 ~EXT4_MOUNT_##opt 992 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 993 EXT4_MOUNT_##opt 994 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 995 EXT4_MOUNT_##opt) 996 997 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 998 ~EXT4_MOUNT2_##opt 999 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1000 EXT4_MOUNT2_##opt 1001 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1002 EXT4_MOUNT2_##opt) 1003 1004 #define ext4_test_and_set_bit __test_and_set_bit_le 1005 #define ext4_set_bit __set_bit_le 1006 #define ext4_set_bit_atomic ext2_set_bit_atomic 1007 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1008 #define ext4_clear_bit __clear_bit_le 1009 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1010 #define ext4_test_bit test_bit_le 1011 #define ext4_find_next_zero_bit find_next_zero_bit_le 1012 #define ext4_find_next_bit find_next_bit_le 1013 1014 extern void ext4_set_bits(void *bm, int cur, int len); 1015 1016 /* 1017 * Maximal mount counts between two filesystem checks 1018 */ 1019 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1020 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1021 1022 /* 1023 * Behaviour when detecting errors 1024 */ 1025 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1026 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1027 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1028 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1029 1030 /* Metadata checksum algorithm codes */ 1031 #define EXT4_CRC32C_CHKSUM 1 1032 1033 /* 1034 * Structure of the super block 1035 */ 1036 struct ext4_super_block { 1037 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1038 __le32 s_blocks_count_lo; /* Blocks count */ 1039 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1040 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1041 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1042 __le32 s_first_data_block; /* First Data Block */ 1043 __le32 s_log_block_size; /* Block size */ 1044 __le32 s_log_cluster_size; /* Allocation cluster size */ 1045 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1046 __le32 s_clusters_per_group; /* # Clusters per group */ 1047 __le32 s_inodes_per_group; /* # Inodes per group */ 1048 __le32 s_mtime; /* Mount time */ 1049 /*30*/ __le32 s_wtime; /* Write time */ 1050 __le16 s_mnt_count; /* Mount count */ 1051 __le16 s_max_mnt_count; /* Maximal mount count */ 1052 __le16 s_magic; /* Magic signature */ 1053 __le16 s_state; /* File system state */ 1054 __le16 s_errors; /* Behaviour when detecting errors */ 1055 __le16 s_minor_rev_level; /* minor revision level */ 1056 /*40*/ __le32 s_lastcheck; /* time of last check */ 1057 __le32 s_checkinterval; /* max. time between checks */ 1058 __le32 s_creator_os; /* OS */ 1059 __le32 s_rev_level; /* Revision level */ 1060 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1061 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1062 /* 1063 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1064 * 1065 * Note: the difference between the compatible feature set and 1066 * the incompatible feature set is that if there is a bit set 1067 * in the incompatible feature set that the kernel doesn't 1068 * know about, it should refuse to mount the filesystem. 1069 * 1070 * e2fsck's requirements are more strict; if it doesn't know 1071 * about a feature in either the compatible or incompatible 1072 * feature set, it must abort and not try to meddle with 1073 * things it doesn't understand... 1074 */ 1075 __le32 s_first_ino; /* First non-reserved inode */ 1076 __le16 s_inode_size; /* size of inode structure */ 1077 __le16 s_block_group_nr; /* block group # of this superblock */ 1078 __le32 s_feature_compat; /* compatible feature set */ 1079 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1080 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1081 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1082 /*78*/ char s_volume_name[16]; /* volume name */ 1083 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 1084 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1085 /* 1086 * Performance hints. Directory preallocation should only 1087 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1088 */ 1089 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1090 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1091 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1092 /* 1093 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1094 */ 1095 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1096 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1097 __le32 s_journal_dev; /* device number of journal file */ 1098 __le32 s_last_orphan; /* start of list of inodes to delete */ 1099 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1100 __u8 s_def_hash_version; /* Default hash version to use */ 1101 __u8 s_jnl_backup_type; 1102 __le16 s_desc_size; /* size of group descriptor */ 1103 /*100*/ __le32 s_default_mount_opts; 1104 __le32 s_first_meta_bg; /* First metablock block group */ 1105 __le32 s_mkfs_time; /* When the filesystem was created */ 1106 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1107 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1108 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1109 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1110 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1111 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1112 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1113 __le32 s_flags; /* Miscellaneous flags */ 1114 __le16 s_raid_stride; /* RAID stride */ 1115 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1116 __le64 s_mmp_block; /* Block for multi-mount protection */ 1117 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1118 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1119 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1120 __le16 s_reserved_pad; 1121 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1122 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1123 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1124 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1125 snapshot's future use */ 1126 __le32 s_snapshot_list; /* inode number of the head of the 1127 on-disk snapshot list */ 1128 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1129 __le32 s_error_count; /* number of fs errors */ 1130 __le32 s_first_error_time; /* first time an error happened */ 1131 __le32 s_first_error_ino; /* inode involved in first error */ 1132 __le64 s_first_error_block; /* block involved of first error */ 1133 __u8 s_first_error_func[32]; /* function where the error happened */ 1134 __le32 s_first_error_line; /* line number where error happened */ 1135 __le32 s_last_error_time; /* most recent time of an error */ 1136 __le32 s_last_error_ino; /* inode involved in last error */ 1137 __le32 s_last_error_line; /* line number where error happened */ 1138 __le64 s_last_error_block; /* block involved of last error */ 1139 __u8 s_last_error_func[32]; /* function where the error happened */ 1140 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1141 __u8 s_mount_opts[64]; 1142 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1143 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1144 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1145 __le32 s_reserved[108]; /* Padding to the end of the block */ 1146 __le32 s_checksum; /* crc32c(superblock) */ 1147 }; 1148 1149 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1150 1151 #ifdef __KERNEL__ 1152 1153 /* 1154 * run-time mount flags 1155 */ 1156 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1157 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1158 1159 /* 1160 * fourth extended-fs super-block data in memory 1161 */ 1162 struct ext4_sb_info { 1163 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1164 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1165 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1166 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1167 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1168 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1169 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1170 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1171 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1172 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1173 unsigned long s_overhead; /* # of fs overhead clusters */ 1174 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1175 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1176 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1177 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1178 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1179 struct buffer_head **s_group_desc; 1180 unsigned int s_mount_opt; 1181 unsigned int s_mount_opt2; 1182 unsigned int s_mount_flags; 1183 unsigned int s_def_mount_opt; 1184 ext4_fsblk_t s_sb_block; 1185 atomic64_t s_resv_clusters; 1186 kuid_t s_resuid; 1187 kgid_t s_resgid; 1188 unsigned short s_mount_state; 1189 unsigned short s_pad; 1190 int s_addr_per_block_bits; 1191 int s_desc_per_block_bits; 1192 int s_inode_size; 1193 int s_first_ino; 1194 unsigned int s_inode_readahead_blks; 1195 unsigned int s_inode_goal; 1196 spinlock_t s_next_gen_lock; 1197 u32 s_next_generation; 1198 u32 s_hash_seed[4]; 1199 int s_def_hash_version; 1200 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1201 struct percpu_counter s_freeclusters_counter; 1202 struct percpu_counter s_freeinodes_counter; 1203 struct percpu_counter s_dirs_counter; 1204 struct percpu_counter s_dirtyclusters_counter; 1205 struct blockgroup_lock *s_blockgroup_lock; 1206 struct proc_dir_entry *s_proc; 1207 struct kobject s_kobj; 1208 struct completion s_kobj_unregister; 1209 struct super_block *s_sb; 1210 1211 /* Journaling */ 1212 struct journal_s *s_journal; 1213 struct list_head s_orphan; 1214 struct mutex s_orphan_lock; 1215 unsigned long s_resize_flags; /* Flags indicating if there 1216 is a resizer */ 1217 unsigned long s_commit_interval; 1218 u32 s_max_batch_time; 1219 u32 s_min_batch_time; 1220 struct block_device *journal_bdev; 1221 #ifdef CONFIG_QUOTA 1222 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ 1223 int s_jquota_fmt; /* Format of quota to use */ 1224 #endif 1225 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1226 struct rb_root system_blks; 1227 1228 #ifdef EXTENTS_STATS 1229 /* ext4 extents stats */ 1230 unsigned long s_ext_min; 1231 unsigned long s_ext_max; 1232 unsigned long s_depth_max; 1233 spinlock_t s_ext_stats_lock; 1234 unsigned long s_ext_blocks; 1235 unsigned long s_ext_extents; 1236 #endif 1237 1238 /* for buddy allocator */ 1239 struct ext4_group_info ***s_group_info; 1240 struct inode *s_buddy_cache; 1241 spinlock_t s_md_lock; 1242 unsigned short *s_mb_offsets; 1243 unsigned int *s_mb_maxs; 1244 unsigned int s_group_info_size; 1245 1246 /* tunables */ 1247 unsigned long s_stripe; 1248 unsigned int s_mb_stream_request; 1249 unsigned int s_mb_max_to_scan; 1250 unsigned int s_mb_min_to_scan; 1251 unsigned int s_mb_stats; 1252 unsigned int s_mb_order2_reqs; 1253 unsigned int s_mb_group_prealloc; 1254 unsigned int s_max_dir_size_kb; 1255 /* where last allocation was done - for stream allocation */ 1256 unsigned long s_mb_last_group; 1257 unsigned long s_mb_last_start; 1258 1259 /* stats for buddy allocator */ 1260 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1261 atomic_t s_bal_success; /* we found long enough chunks */ 1262 atomic_t s_bal_allocated; /* in blocks */ 1263 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1264 atomic_t s_bal_goals; /* goal hits */ 1265 atomic_t s_bal_breaks; /* too long searches */ 1266 atomic_t s_bal_2orders; /* 2^order hits */ 1267 spinlock_t s_bal_lock; 1268 unsigned long s_mb_buddies_generated; 1269 unsigned long long s_mb_generation_time; 1270 atomic_t s_mb_lost_chunks; 1271 atomic_t s_mb_preallocated; 1272 atomic_t s_mb_discarded; 1273 atomic_t s_lock_busy; 1274 1275 /* locality groups */ 1276 struct ext4_locality_group __percpu *s_locality_groups; 1277 1278 /* for write statistics */ 1279 unsigned long s_sectors_written_start; 1280 u64 s_kbytes_written; 1281 1282 /* the size of zero-out chunk */ 1283 unsigned int s_extent_max_zeroout_kb; 1284 1285 unsigned int s_log_groups_per_flex; 1286 struct flex_groups *s_flex_groups; 1287 ext4_group_t s_flex_groups_allocated; 1288 1289 /* workqueue for reserved extent conversions (buffered io) */ 1290 struct workqueue_struct *rsv_conversion_wq; 1291 1292 /* timer for periodic error stats printing */ 1293 struct timer_list s_err_report; 1294 1295 /* Lazy inode table initialization info */ 1296 struct ext4_li_request *s_li_request; 1297 /* Wait multiplier for lazy initialization thread */ 1298 unsigned int s_li_wait_mult; 1299 1300 /* Kernel thread for multiple mount protection */ 1301 struct task_struct *s_mmp_tsk; 1302 1303 /* record the last minlen when FITRIM is called. */ 1304 atomic_t s_last_trim_minblks; 1305 1306 /* Reference to checksum algorithm driver via cryptoapi */ 1307 struct crypto_shash *s_chksum_driver; 1308 1309 /* Precomputed FS UUID checksum for seeding other checksums */ 1310 __u32 s_csum_seed; 1311 1312 /* Reclaim extents from extent status tree */ 1313 struct shrinker s_es_shrinker; 1314 struct list_head s_es_lru; 1315 unsigned long s_es_last_sorted; 1316 struct percpu_counter s_extent_cache_cnt; 1317 spinlock_t s_es_lru_lock ____cacheline_aligned_in_smp; 1318 1319 /* Ratelimit ext4 messages. */ 1320 struct ratelimit_state s_err_ratelimit_state; 1321 struct ratelimit_state s_warning_ratelimit_state; 1322 struct ratelimit_state s_msg_ratelimit_state; 1323 }; 1324 1325 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1326 { 1327 return sb->s_fs_info; 1328 } 1329 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1330 { 1331 return container_of(inode, struct ext4_inode_info, vfs_inode); 1332 } 1333 1334 static inline struct timespec ext4_current_time(struct inode *inode) 1335 { 1336 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1337 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1338 } 1339 1340 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1341 { 1342 return ino == EXT4_ROOT_INO || 1343 ino == EXT4_USR_QUOTA_INO || 1344 ino == EXT4_GRP_QUOTA_INO || 1345 ino == EXT4_BOOT_LOADER_INO || 1346 ino == EXT4_JOURNAL_INO || 1347 ino == EXT4_RESIZE_INO || 1348 (ino >= EXT4_FIRST_INO(sb) && 1349 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1350 } 1351 1352 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 1353 struct ext4_io_end *io_end) 1354 { 1355 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 1356 io_end->flag |= EXT4_IO_END_UNWRITTEN; 1357 atomic_inc(&EXT4_I(inode)->i_unwritten); 1358 } 1359 } 1360 1361 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode) 1362 { 1363 return inode->i_private; 1364 } 1365 1366 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io) 1367 { 1368 inode->i_private = io; 1369 } 1370 1371 /* 1372 * Inode dynamic state flags 1373 */ 1374 enum { 1375 EXT4_STATE_JDATA, /* journaled data exists */ 1376 EXT4_STATE_NEW, /* inode is newly created */ 1377 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1378 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1379 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1380 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1381 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1382 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1383 EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */ 1384 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read 1385 nolocking */ 1386 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1387 EXT4_STATE_ORDERED_MODE, /* data=ordered mode */ 1388 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1389 }; 1390 1391 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1392 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1393 { \ 1394 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1395 } \ 1396 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1397 { \ 1398 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1399 } \ 1400 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1401 { \ 1402 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1403 } 1404 1405 /* Add these declarations here only so that these functions can be 1406 * found by name. Otherwise, they are very hard to locate. */ 1407 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1408 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1409 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1410 EXT4_INODE_BIT_FNS(flag, flags, 0) 1411 1412 /* Add these declarations here only so that these functions can be 1413 * found by name. Otherwise, they are very hard to locate. */ 1414 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1415 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1416 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1417 #if (BITS_PER_LONG < 64) 1418 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1419 1420 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1421 { 1422 (ei)->i_state_flags = 0; 1423 } 1424 #else 1425 EXT4_INODE_BIT_FNS(state, flags, 32) 1426 1427 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1428 { 1429 /* We depend on the fact that callers will set i_flags */ 1430 } 1431 #endif 1432 #else 1433 /* Assume that user mode programs are passing in an ext4fs superblock, not 1434 * a kernel struct super_block. This will allow us to call the feature-test 1435 * macros from user land. */ 1436 #define EXT4_SB(sb) (sb) 1437 #endif 1438 1439 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1440 1441 /* 1442 * Codes for operating systems 1443 */ 1444 #define EXT4_OS_LINUX 0 1445 #define EXT4_OS_HURD 1 1446 #define EXT4_OS_MASIX 2 1447 #define EXT4_OS_FREEBSD 3 1448 #define EXT4_OS_LITES 4 1449 1450 /* 1451 * Revision levels 1452 */ 1453 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1454 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1455 1456 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1457 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1458 1459 #define EXT4_GOOD_OLD_INODE_SIZE 128 1460 1461 /* 1462 * Feature set definitions 1463 */ 1464 1465 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1466 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1467 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1468 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1469 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1470 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1471 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1472 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1473 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1474 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1475 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1476 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1477 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1478 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1479 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1480 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1481 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1482 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1483 1484 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1485 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1486 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1487 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1488 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1489 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1490 1491 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1492 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1493 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1494 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1495 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1496 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1497 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1498 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1499 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1500 /* 1501 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1502 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1503 * all other data structures' checksums. However, the METADATA_CSUM and 1504 * GDT_CSUM bits are mutually exclusive. 1505 */ 1506 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1507 1508 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1509 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1510 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1511 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1512 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1513 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1514 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1515 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1516 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1517 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1518 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1519 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */ 1520 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1521 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1522 1523 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1524 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1525 EXT4_FEATURE_INCOMPAT_META_BG) 1526 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1527 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1528 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1529 1530 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1531 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1532 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1533 EXT4_FEATURE_INCOMPAT_META_BG) 1534 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1535 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1536 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1537 1538 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 1539 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1540 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1541 EXT4_FEATURE_INCOMPAT_META_BG| \ 1542 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1543 EXT4_FEATURE_INCOMPAT_64BIT| \ 1544 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1545 EXT4_FEATURE_INCOMPAT_MMP | \ 1546 EXT4_FEATURE_INCOMPAT_INLINE_DATA) 1547 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1548 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1549 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1550 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1551 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1552 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1553 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1554 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1555 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1556 EXT4_FEATURE_RO_COMPAT_QUOTA) 1557 1558 /* 1559 * Default values for user and/or group using reserved blocks 1560 */ 1561 #define EXT4_DEF_RESUID 0 1562 #define EXT4_DEF_RESGID 0 1563 1564 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1565 1566 /* 1567 * Default mount options 1568 */ 1569 #define EXT4_DEFM_DEBUG 0x0001 1570 #define EXT4_DEFM_BSDGROUPS 0x0002 1571 #define EXT4_DEFM_XATTR_USER 0x0004 1572 #define EXT4_DEFM_ACL 0x0008 1573 #define EXT4_DEFM_UID16 0x0010 1574 #define EXT4_DEFM_JMODE 0x0060 1575 #define EXT4_DEFM_JMODE_DATA 0x0020 1576 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1577 #define EXT4_DEFM_JMODE_WBACK 0x0060 1578 #define EXT4_DEFM_NOBARRIER 0x0100 1579 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1580 #define EXT4_DEFM_DISCARD 0x0400 1581 #define EXT4_DEFM_NODELALLOC 0x0800 1582 1583 /* 1584 * Default journal batch times 1585 */ 1586 #define EXT4_DEF_MIN_BATCH_TIME 0 1587 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1588 1589 /* 1590 * Minimum number of groups in a flexgroup before we separate out 1591 * directories into the first block group of a flexgroup 1592 */ 1593 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1594 1595 /* 1596 * Structure of a directory entry 1597 */ 1598 #define EXT4_NAME_LEN 255 1599 1600 struct ext4_dir_entry { 1601 __le32 inode; /* Inode number */ 1602 __le16 rec_len; /* Directory entry length */ 1603 __le16 name_len; /* Name length */ 1604 char name[EXT4_NAME_LEN]; /* File name */ 1605 }; 1606 1607 /* 1608 * The new version of the directory entry. Since EXT4 structures are 1609 * stored in intel byte order, and the name_len field could never be 1610 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1611 * file_type field. 1612 */ 1613 struct ext4_dir_entry_2 { 1614 __le32 inode; /* Inode number */ 1615 __le16 rec_len; /* Directory entry length */ 1616 __u8 name_len; /* Name length */ 1617 __u8 file_type; 1618 char name[EXT4_NAME_LEN]; /* File name */ 1619 }; 1620 1621 /* 1622 * This is a bogus directory entry at the end of each leaf block that 1623 * records checksums. 1624 */ 1625 struct ext4_dir_entry_tail { 1626 __le32 det_reserved_zero1; /* Pretend to be unused */ 1627 __le16 det_rec_len; /* 12 */ 1628 __u8 det_reserved_zero2; /* Zero name length */ 1629 __u8 det_reserved_ft; /* 0xDE, fake file type */ 1630 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1631 }; 1632 1633 #define EXT4_DIRENT_TAIL(block, blocksize) \ 1634 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 1635 ((blocksize) - \ 1636 sizeof(struct ext4_dir_entry_tail)))) 1637 1638 /* 1639 * Ext4 directory file types. Only the low 3 bits are used. The 1640 * other bits are reserved for now. 1641 */ 1642 #define EXT4_FT_UNKNOWN 0 1643 #define EXT4_FT_REG_FILE 1 1644 #define EXT4_FT_DIR 2 1645 #define EXT4_FT_CHRDEV 3 1646 #define EXT4_FT_BLKDEV 4 1647 #define EXT4_FT_FIFO 5 1648 #define EXT4_FT_SOCK 6 1649 #define EXT4_FT_SYMLINK 7 1650 1651 #define EXT4_FT_MAX 8 1652 1653 #define EXT4_FT_DIR_CSUM 0xDE 1654 1655 /* 1656 * EXT4_DIR_PAD defines the directory entries boundaries 1657 * 1658 * NOTE: It must be a multiple of 4 1659 */ 1660 #define EXT4_DIR_PAD 4 1661 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1662 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1663 ~EXT4_DIR_ROUND) 1664 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1665 1666 /* 1667 * If we ever get support for fs block sizes > page_size, we'll need 1668 * to remove the #if statements in the next two functions... 1669 */ 1670 static inline unsigned int 1671 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1672 { 1673 unsigned len = le16_to_cpu(dlen); 1674 1675 #if (PAGE_CACHE_SIZE >= 65536) 1676 if (len == EXT4_MAX_REC_LEN || len == 0) 1677 return blocksize; 1678 return (len & 65532) | ((len & 3) << 16); 1679 #else 1680 return len; 1681 #endif 1682 } 1683 1684 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1685 { 1686 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1687 BUG(); 1688 #if (PAGE_CACHE_SIZE >= 65536) 1689 if (len < 65536) 1690 return cpu_to_le16(len); 1691 if (len == blocksize) { 1692 if (blocksize == 65536) 1693 return cpu_to_le16(EXT4_MAX_REC_LEN); 1694 else 1695 return cpu_to_le16(0); 1696 } 1697 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 1698 #else 1699 return cpu_to_le16(len); 1700 #endif 1701 } 1702 1703 /* 1704 * Hash Tree Directory indexing 1705 * (c) Daniel Phillips, 2001 1706 */ 1707 1708 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 1709 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 1710 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 1711 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 1712 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 1713 1714 /* Legal values for the dx_root hash_version field: */ 1715 1716 #define DX_HASH_LEGACY 0 1717 #define DX_HASH_HALF_MD4 1 1718 #define DX_HASH_TEA 2 1719 #define DX_HASH_LEGACY_UNSIGNED 3 1720 #define DX_HASH_HALF_MD4_UNSIGNED 4 1721 #define DX_HASH_TEA_UNSIGNED 5 1722 1723 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 1724 const void *address, unsigned int length) 1725 { 1726 struct { 1727 struct shash_desc shash; 1728 char ctx[4]; 1729 } desc; 1730 int err; 1731 1732 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 1733 1734 desc.shash.tfm = sbi->s_chksum_driver; 1735 desc.shash.flags = 0; 1736 *(u32 *)desc.ctx = crc; 1737 1738 err = crypto_shash_update(&desc.shash, address, length); 1739 BUG_ON(err); 1740 1741 return *(u32 *)desc.ctx; 1742 } 1743 1744 #ifdef __KERNEL__ 1745 1746 /* hash info structure used by the directory hash */ 1747 struct dx_hash_info 1748 { 1749 u32 hash; 1750 u32 minor_hash; 1751 int hash_version; 1752 u32 *seed; 1753 }; 1754 1755 1756 /* 32 and 64 bit signed EOF for dx directories */ 1757 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 1758 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 1759 1760 1761 /* 1762 * Control parameters used by ext4_htree_next_block 1763 */ 1764 #define HASH_NB_ALWAYS 1 1765 1766 1767 /* 1768 * Describe an inode's exact location on disk and in memory 1769 */ 1770 struct ext4_iloc 1771 { 1772 struct buffer_head *bh; 1773 unsigned long offset; 1774 ext4_group_t block_group; 1775 }; 1776 1777 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 1778 { 1779 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 1780 } 1781 1782 /* 1783 * This structure is stuffed into the struct file's private_data field 1784 * for directories. It is where we put information so that we can do 1785 * readdir operations in hash tree order. 1786 */ 1787 struct dir_private_info { 1788 struct rb_root root; 1789 struct rb_node *curr_node; 1790 struct fname *extra_fname; 1791 loff_t last_pos; 1792 __u32 curr_hash; 1793 __u32 curr_minor_hash; 1794 __u32 next_hash; 1795 }; 1796 1797 /* calculate the first block number of the group */ 1798 static inline ext4_fsblk_t 1799 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 1800 { 1801 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 1802 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 1803 } 1804 1805 /* 1806 * Special error return code only used by dx_probe() and its callers. 1807 */ 1808 #define ERR_BAD_DX_DIR -75000 1809 1810 /* 1811 * Timeout and state flag for lazy initialization inode thread. 1812 */ 1813 #define EXT4_DEF_LI_WAIT_MULT 10 1814 #define EXT4_DEF_LI_MAX_START_DELAY 5 1815 #define EXT4_LAZYINIT_QUIT 0x0001 1816 #define EXT4_LAZYINIT_RUNNING 0x0002 1817 1818 /* 1819 * Lazy inode table initialization info 1820 */ 1821 struct ext4_lazy_init { 1822 unsigned long li_state; 1823 struct list_head li_request_list; 1824 struct mutex li_list_mtx; 1825 }; 1826 1827 struct ext4_li_request { 1828 struct super_block *lr_super; 1829 struct ext4_sb_info *lr_sbi; 1830 ext4_group_t lr_next_group; 1831 struct list_head lr_request; 1832 unsigned long lr_next_sched; 1833 unsigned long lr_timeout; 1834 }; 1835 1836 struct ext4_features { 1837 struct kobject f_kobj; 1838 struct completion f_kobj_unregister; 1839 }; 1840 1841 /* 1842 * This structure will be used for multiple mount protection. It will be 1843 * written into the block number saved in the s_mmp_block field in the 1844 * superblock. Programs that check MMP should assume that if 1845 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 1846 * to use the filesystem, regardless of how old the timestamp is. 1847 */ 1848 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 1849 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 1850 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 1851 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 1852 1853 struct mmp_struct { 1854 __le32 mmp_magic; /* Magic number for MMP */ 1855 __le32 mmp_seq; /* Sequence no. updated periodically */ 1856 1857 /* 1858 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 1859 * purposes and do not affect the correctness of the algorithm 1860 */ 1861 __le64 mmp_time; /* Time last updated */ 1862 char mmp_nodename[64]; /* Node which last updated MMP block */ 1863 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 1864 1865 /* 1866 * mmp_check_interval is used to verify if the MMP block has been 1867 * updated on the block device. The value is updated based on the 1868 * maximum time to write the MMP block during an update cycle. 1869 */ 1870 __le16 mmp_check_interval; 1871 1872 __le16 mmp_pad1; 1873 __le32 mmp_pad2[226]; 1874 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 1875 }; 1876 1877 /* arguments passed to the mmp thread */ 1878 struct mmpd_data { 1879 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 1880 struct super_block *sb; /* super block of the fs */ 1881 }; 1882 1883 /* 1884 * Check interval multiplier 1885 * The MMP block is written every update interval and initially checked every 1886 * update interval x the multiplier (the value is then adapted based on the 1887 * write latency). The reason is that writes can be delayed under load and we 1888 * don't want readers to incorrectly assume that the filesystem is no longer 1889 * in use. 1890 */ 1891 #define EXT4_MMP_CHECK_MULT 2UL 1892 1893 /* 1894 * Minimum interval for MMP checking in seconds. 1895 */ 1896 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 1897 1898 /* 1899 * Maximum interval for MMP checking in seconds. 1900 */ 1901 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 1902 1903 /* 1904 * Function prototypes 1905 */ 1906 1907 /* 1908 * Ok, these declarations are also in <linux/kernel.h> but none of the 1909 * ext4 source programs needs to include it so they are duplicated here. 1910 */ 1911 # define NORET_TYPE /**/ 1912 # define ATTRIB_NORET __attribute__((noreturn)) 1913 # define NORET_AND noreturn, 1914 1915 /* bitmap.c */ 1916 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 1917 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 1918 struct ext4_group_desc *gdp, 1919 struct buffer_head *bh, int sz); 1920 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 1921 struct ext4_group_desc *gdp, 1922 struct buffer_head *bh, int sz); 1923 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 1924 struct ext4_group_desc *gdp, 1925 struct buffer_head *bh); 1926 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 1927 struct ext4_group_desc *gdp, 1928 struct buffer_head *bh); 1929 1930 /* balloc.c */ 1931 extern void ext4_get_group_no_and_offset(struct super_block *sb, 1932 ext4_fsblk_t blocknr, 1933 ext4_group_t *blockgrpp, 1934 ext4_grpblk_t *offsetp); 1935 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 1936 ext4_fsblk_t block); 1937 1938 extern void ext4_validate_block_bitmap(struct super_block *sb, 1939 struct ext4_group_desc *desc, 1940 ext4_group_t block_group, 1941 struct buffer_head *bh); 1942 extern unsigned int ext4_block_group(struct super_block *sb, 1943 ext4_fsblk_t blocknr); 1944 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 1945 ext4_fsblk_t blocknr); 1946 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 1947 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 1948 ext4_group_t group); 1949 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 1950 ext4_fsblk_t goal, 1951 unsigned int flags, 1952 unsigned long *count, 1953 int *errp); 1954 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 1955 s64 nclusters, unsigned int flags); 1956 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 1957 extern void ext4_check_blocks_bitmap(struct super_block *); 1958 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 1959 ext4_group_t block_group, 1960 struct buffer_head ** bh); 1961 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1962 1963 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 1964 ext4_group_t block_group); 1965 extern int ext4_wait_block_bitmap(struct super_block *sb, 1966 ext4_group_t block_group, 1967 struct buffer_head *bh); 1968 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 1969 ext4_group_t block_group); 1970 extern void ext4_init_block_bitmap(struct super_block *sb, 1971 struct buffer_head *bh, 1972 ext4_group_t group, 1973 struct ext4_group_desc *desc); 1974 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 1975 ext4_group_t block_group, 1976 struct ext4_group_desc *gdp); 1977 extern unsigned ext4_num_overhead_clusters(struct super_block *sb, 1978 ext4_group_t block_group, 1979 struct ext4_group_desc *gdp); 1980 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 1981 1982 /* dir.c */ 1983 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 1984 struct file *, 1985 struct ext4_dir_entry_2 *, 1986 struct buffer_head *, char *, int, 1987 unsigned int); 1988 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 1989 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 1990 (de), (bh), (buf), (size), (offset))) 1991 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 1992 __u32 minor_hash, 1993 struct ext4_dir_entry_2 *dirent); 1994 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 1995 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 1996 struct buffer_head *bh, 1997 void *buf, int buf_size, 1998 const char *name, int namelen, 1999 struct ext4_dir_entry_2 **dest_de); 2000 void ext4_insert_dentry(struct inode *inode, 2001 struct ext4_dir_entry_2 *de, 2002 int buf_size, 2003 const char *name, int namelen); 2004 static inline void ext4_update_dx_flag(struct inode *inode) 2005 { 2006 if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb, 2007 EXT4_FEATURE_COMPAT_DIR_INDEX)) 2008 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2009 } 2010 static unsigned char ext4_filetype_table[] = { 2011 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2012 }; 2013 2014 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2015 { 2016 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE) || 2017 (filetype >= EXT4_FT_MAX)) 2018 return DT_UNKNOWN; 2019 2020 return ext4_filetype_table[filetype]; 2021 } 2022 2023 /* fsync.c */ 2024 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2025 2026 /* hash.c */ 2027 extern int ext4fs_dirhash(const char *name, int len, struct 2028 dx_hash_info *hinfo); 2029 2030 /* ialloc.c */ 2031 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2032 const struct qstr *qstr, __u32 goal, 2033 uid_t *owner, int handle_type, 2034 unsigned int line_no, int nblocks); 2035 2036 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \ 2037 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2038 0, 0, 0) 2039 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2040 type, nblocks) \ 2041 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2042 (type), __LINE__, (nblocks)) 2043 2044 2045 extern void ext4_free_inode(handle_t *, struct inode *); 2046 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2047 extern unsigned long ext4_count_free_inodes(struct super_block *); 2048 extern unsigned long ext4_count_dirs(struct super_block *); 2049 extern void ext4_check_inodes_bitmap(struct super_block *); 2050 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2051 extern int ext4_init_inode_table(struct super_block *sb, 2052 ext4_group_t group, int barrier); 2053 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2054 2055 /* mballoc.c */ 2056 extern long ext4_mb_stats; 2057 extern long ext4_mb_max_to_scan; 2058 extern int ext4_mb_init(struct super_block *); 2059 extern int ext4_mb_release(struct super_block *); 2060 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2061 struct ext4_allocation_request *, int *); 2062 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2063 extern void ext4_discard_preallocations(struct inode *); 2064 extern int __init ext4_init_mballoc(void); 2065 extern void ext4_exit_mballoc(void); 2066 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2067 struct buffer_head *bh, ext4_fsblk_t block, 2068 unsigned long count, int flags); 2069 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2070 ext4_group_t ngroups); 2071 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2072 ext4_group_t i, struct ext4_group_desc *desc); 2073 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2074 ext4_fsblk_t block, unsigned long count); 2075 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2076 2077 /* inode.c */ 2078 struct buffer_head *ext4_getblk(handle_t *, struct inode *, 2079 ext4_lblk_t, int, int *); 2080 struct buffer_head *ext4_bread(handle_t *, struct inode *, 2081 ext4_lblk_t, int, int *); 2082 int ext4_get_block_write(struct inode *inode, sector_t iblock, 2083 struct buffer_head *bh_result, int create); 2084 int ext4_get_block(struct inode *inode, sector_t iblock, 2085 struct buffer_head *bh_result, int create); 2086 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2087 struct buffer_head *bh, int create); 2088 int ext4_walk_page_buffers(handle_t *handle, 2089 struct buffer_head *head, 2090 unsigned from, 2091 unsigned to, 2092 int *partial, 2093 int (*fn)(handle_t *handle, 2094 struct buffer_head *bh)); 2095 int do_journal_get_write_access(handle_t *handle, 2096 struct buffer_head *bh); 2097 #define FALL_BACK_TO_NONDELALLOC 1 2098 #define CONVERT_INLINE_DATA 2 2099 2100 extern struct inode *ext4_iget(struct super_block *, unsigned long); 2101 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2102 extern int ext4_setattr(struct dentry *, struct iattr *); 2103 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 2104 struct kstat *stat); 2105 extern void ext4_evict_inode(struct inode *); 2106 extern void ext4_clear_inode(struct inode *); 2107 extern int ext4_sync_inode(handle_t *, struct inode *); 2108 extern void ext4_dirty_inode(struct inode *, int); 2109 extern int ext4_change_inode_journal_flag(struct inode *, int); 2110 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2111 extern int ext4_inode_attach_jinode(struct inode *inode); 2112 extern int ext4_can_truncate(struct inode *inode); 2113 extern void ext4_truncate(struct inode *); 2114 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2115 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 2116 extern void ext4_set_inode_flags(struct inode *); 2117 extern void ext4_get_inode_flags(struct ext4_inode_info *); 2118 extern int ext4_alloc_da_blocks(struct inode *inode); 2119 extern void ext4_set_aops(struct inode *inode); 2120 extern int ext4_writepage_trans_blocks(struct inode *); 2121 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2122 extern int ext4_block_truncate_page(handle_t *handle, 2123 struct address_space *mapping, loff_t from); 2124 extern int ext4_block_zero_page_range(handle_t *handle, 2125 struct address_space *mapping, loff_t from, loff_t length); 2126 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2127 loff_t lstart, loff_t lend); 2128 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 2129 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2130 extern void ext4_da_update_reserve_space(struct inode *inode, 2131 int used, int quota_claim); 2132 2133 /* indirect.c */ 2134 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2135 struct ext4_map_blocks *map, int flags); 2136 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb, 2137 const struct iovec *iov, loff_t offset, 2138 unsigned long nr_segs); 2139 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2140 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2141 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2142 extern int ext4_free_hole_blocks(handle_t *handle, struct inode *inode, 2143 ext4_lblk_t first, ext4_lblk_t stop); 2144 2145 /* ioctl.c */ 2146 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2147 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2148 2149 /* migrate.c */ 2150 extern int ext4_ext_migrate(struct inode *); 2151 extern int ext4_ind_migrate(struct inode *inode); 2152 2153 /* namei.c */ 2154 extern int ext4_dirent_csum_verify(struct inode *inode, 2155 struct ext4_dir_entry *dirent); 2156 extern int ext4_orphan_add(handle_t *, struct inode *); 2157 extern int ext4_orphan_del(handle_t *, struct inode *); 2158 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2159 __u32 start_minor_hash, __u32 *next_hash); 2160 extern int search_dir(struct buffer_head *bh, 2161 char *search_buf, 2162 int buf_size, 2163 struct inode *dir, 2164 const struct qstr *d_name, 2165 unsigned int offset, 2166 struct ext4_dir_entry_2 **res_dir); 2167 extern int ext4_generic_delete_entry(handle_t *handle, 2168 struct inode *dir, 2169 struct ext4_dir_entry_2 *de_del, 2170 struct buffer_head *bh, 2171 void *entry_buf, 2172 int buf_size, 2173 int csum_size); 2174 2175 /* resize.c */ 2176 extern int ext4_group_add(struct super_block *sb, 2177 struct ext4_new_group_data *input); 2178 extern int ext4_group_extend(struct super_block *sb, 2179 struct ext4_super_block *es, 2180 ext4_fsblk_t n_blocks_count); 2181 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2182 2183 /* super.c */ 2184 extern int ext4_calculate_overhead(struct super_block *sb); 2185 extern int ext4_superblock_csum_verify(struct super_block *sb, 2186 struct ext4_super_block *es); 2187 extern void ext4_superblock_csum_set(struct super_block *sb); 2188 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 2189 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 2190 extern void ext4_kvfree(void *ptr); 2191 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2192 ext4_group_t ngroup); 2193 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2194 char nbuf[16]); 2195 2196 extern __printf(4, 5) 2197 void __ext4_error(struct super_block *, const char *, unsigned int, 2198 const char *, ...); 2199 extern __printf(5, 6) 2200 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2201 const char *, ...); 2202 extern __printf(5, 6) 2203 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2204 const char *, ...); 2205 extern void __ext4_std_error(struct super_block *, const char *, 2206 unsigned int, int); 2207 extern __printf(4, 5) 2208 void __ext4_abort(struct super_block *, const char *, unsigned int, 2209 const char *, ...); 2210 extern __printf(4, 5) 2211 void __ext4_warning(struct super_block *, const char *, unsigned int, 2212 const char *, ...); 2213 extern __printf(3, 4) 2214 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2215 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2216 const char *, unsigned int, const char *); 2217 extern __printf(7, 8) 2218 void __ext4_grp_locked_error(const char *, unsigned int, 2219 struct super_block *, ext4_group_t, 2220 unsigned long, ext4_fsblk_t, 2221 const char *, ...); 2222 2223 #ifdef CONFIG_PRINTK 2224 2225 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2226 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__) 2227 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2228 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2229 #define ext4_error(sb, fmt, ...) \ 2230 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2231 #define ext4_abort(sb, fmt, ...) \ 2232 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2233 #define ext4_warning(sb, fmt, ...) \ 2234 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2235 #define ext4_msg(sb, level, fmt, ...) \ 2236 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 2237 #define dump_mmp_msg(sb, mmp, msg) \ 2238 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 2239 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2240 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 2241 fmt, ##__VA_ARGS__) 2242 2243 #else 2244 2245 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2246 do { \ 2247 no_printk(fmt, ##__VA_ARGS__); \ 2248 __ext4_error_inode(inode, "", 0, block, " "); \ 2249 } while (0) 2250 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2251 do { \ 2252 no_printk(fmt, ##__VA_ARGS__); \ 2253 __ext4_error_file(file, "", 0, block, " "); \ 2254 } while (0) 2255 #define ext4_error(sb, fmt, ...) \ 2256 do { \ 2257 no_printk(fmt, ##__VA_ARGS__); \ 2258 __ext4_error(sb, "", 0, " "); \ 2259 } while (0) 2260 #define ext4_abort(sb, fmt, ...) \ 2261 do { \ 2262 no_printk(fmt, ##__VA_ARGS__); \ 2263 __ext4_abort(sb, "", 0, " "); \ 2264 } while (0) 2265 #define ext4_warning(sb, fmt, ...) \ 2266 do { \ 2267 no_printk(fmt, ##__VA_ARGS__); \ 2268 __ext4_warning(sb, "", 0, " "); \ 2269 } while (0) 2270 #define ext4_msg(sb, level, fmt, ...) \ 2271 do { \ 2272 no_printk(fmt, ##__VA_ARGS__); \ 2273 __ext4_msg(sb, "", " "); \ 2274 } while (0) 2275 #define dump_mmp_msg(sb, mmp, msg) \ 2276 __dump_mmp_msg(sb, mmp, "", 0, "") 2277 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2278 do { \ 2279 no_printk(fmt, ##__VA_ARGS__); \ 2280 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 2281 } while (0) 2282 2283 #endif 2284 2285 extern void ext4_update_dynamic_rev(struct super_block *sb); 2286 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2287 __u32 compat); 2288 extern int ext4_update_rocompat_feature(handle_t *handle, 2289 struct super_block *sb, __u32 rocompat); 2290 extern int ext4_update_incompat_feature(handle_t *handle, 2291 struct super_block *sb, __u32 incompat); 2292 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2293 struct ext4_group_desc *bg); 2294 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2295 struct ext4_group_desc *bg); 2296 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2297 struct ext4_group_desc *bg); 2298 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2299 struct ext4_group_desc *bg); 2300 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2301 struct ext4_group_desc *bg); 2302 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2303 struct ext4_group_desc *bg); 2304 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2305 struct ext4_group_desc *bg); 2306 extern void ext4_block_bitmap_set(struct super_block *sb, 2307 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2308 extern void ext4_inode_bitmap_set(struct super_block *sb, 2309 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2310 extern void ext4_inode_table_set(struct super_block *sb, 2311 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2312 extern void ext4_free_group_clusters_set(struct super_block *sb, 2313 struct ext4_group_desc *bg, 2314 __u32 count); 2315 extern void ext4_free_inodes_set(struct super_block *sb, 2316 struct ext4_group_desc *bg, __u32 count); 2317 extern void ext4_used_dirs_set(struct super_block *sb, 2318 struct ext4_group_desc *bg, __u32 count); 2319 extern void ext4_itable_unused_set(struct super_block *sb, 2320 struct ext4_group_desc *bg, __u32 count); 2321 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2322 struct ext4_group_desc *gdp); 2323 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2324 struct ext4_group_desc *gdp); 2325 extern int ext4_register_li_request(struct super_block *sb, 2326 ext4_group_t first_not_zeroed); 2327 2328 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2329 { 2330 return EXT4_HAS_RO_COMPAT_FEATURE(sb, 2331 EXT4_FEATURE_RO_COMPAT_GDT_CSUM | 2332 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM); 2333 } 2334 2335 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2336 { 2337 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2338 le32_to_cpu(es->s_blocks_count_lo); 2339 } 2340 2341 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2342 { 2343 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2344 le32_to_cpu(es->s_r_blocks_count_lo); 2345 } 2346 2347 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2348 { 2349 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2350 le32_to_cpu(es->s_free_blocks_count_lo); 2351 } 2352 2353 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2354 ext4_fsblk_t blk) 2355 { 2356 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2357 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2358 } 2359 2360 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2361 ext4_fsblk_t blk) 2362 { 2363 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2364 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2365 } 2366 2367 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2368 ext4_fsblk_t blk) 2369 { 2370 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2371 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2372 } 2373 2374 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 2375 { 2376 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2377 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2378 le32_to_cpu(raw_inode->i_size_lo); 2379 else 2380 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2381 } 2382 2383 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2384 { 2385 raw_inode->i_size_lo = cpu_to_le32(i_size); 2386 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2387 } 2388 2389 static inline 2390 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2391 ext4_group_t group) 2392 { 2393 struct ext4_group_info ***grp_info; 2394 long indexv, indexh; 2395 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 2396 grp_info = EXT4_SB(sb)->s_group_info; 2397 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2398 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2399 return grp_info[indexv][indexh]; 2400 } 2401 2402 /* 2403 * Reading s_groups_count requires using smp_rmb() afterwards. See 2404 * the locking protocol documented in the comments of ext4_group_add() 2405 * in resize.c 2406 */ 2407 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2408 { 2409 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2410 2411 smp_rmb(); 2412 return ngroups; 2413 } 2414 2415 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2416 ext4_group_t block_group) 2417 { 2418 return block_group >> sbi->s_log_groups_per_flex; 2419 } 2420 2421 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2422 { 2423 return 1 << sbi->s_log_groups_per_flex; 2424 } 2425 2426 #define ext4_std_error(sb, errno) \ 2427 do { \ 2428 if ((errno)) \ 2429 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2430 } while (0) 2431 2432 #ifdef CONFIG_SMP 2433 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2434 * counters. So we need to make sure we have free clusters more 2435 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2436 */ 2437 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2438 #else 2439 #define EXT4_FREECLUSTERS_WATERMARK 0 2440 #endif 2441 2442 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 2443 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2444 { 2445 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 2446 !mutex_is_locked(&inode->i_mutex)); 2447 down_write(&EXT4_I(inode)->i_data_sem); 2448 if (newsize > EXT4_I(inode)->i_disksize) 2449 EXT4_I(inode)->i_disksize = newsize; 2450 up_write(&EXT4_I(inode)->i_data_sem); 2451 } 2452 2453 /* 2454 * Update i_disksize after writeback has been started. Races with truncate 2455 * are avoided by checking i_size under i_data_sem. 2456 */ 2457 static inline void ext4_wb_update_i_disksize(struct inode *inode, loff_t newsize) 2458 { 2459 loff_t i_size; 2460 2461 down_write(&EXT4_I(inode)->i_data_sem); 2462 i_size = i_size_read(inode); 2463 if (newsize > i_size) 2464 newsize = i_size; 2465 if (newsize > EXT4_I(inode)->i_disksize) 2466 EXT4_I(inode)->i_disksize = newsize; 2467 up_write(&EXT4_I(inode)->i_data_sem); 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 extern void ext4_unwritten_wait(struct inode *inode); 2576 2577 /* inline.c */ 2578 extern int ext4_has_inline_data(struct inode *inode); 2579 extern int ext4_get_inline_size(struct inode *inode); 2580 extern int ext4_get_max_inline_size(struct inode *inode); 2581 extern int ext4_find_inline_data_nolock(struct inode *inode); 2582 extern void ext4_write_inline_data(struct inode *inode, 2583 struct ext4_iloc *iloc, 2584 void *buffer, loff_t pos, 2585 unsigned int len); 2586 extern int ext4_prepare_inline_data(handle_t *handle, struct inode *inode, 2587 unsigned int len); 2588 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 2589 unsigned int len); 2590 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 2591 2592 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 2593 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 2594 struct inode *inode, 2595 loff_t pos, unsigned len, 2596 unsigned flags, 2597 struct page **pagep); 2598 extern int ext4_write_inline_data_end(struct inode *inode, 2599 loff_t pos, unsigned len, 2600 unsigned copied, 2601 struct page *page); 2602 extern struct buffer_head * 2603 ext4_journalled_write_inline_data(struct inode *inode, 2604 unsigned len, 2605 struct page *page); 2606 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 2607 struct inode *inode, 2608 loff_t pos, unsigned len, 2609 unsigned flags, 2610 struct page **pagep, 2611 void **fsdata); 2612 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 2613 unsigned len, unsigned copied, 2614 struct page *page); 2615 extern int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry, 2616 struct inode *inode); 2617 extern int ext4_try_create_inline_dir(handle_t *handle, 2618 struct inode *parent, 2619 struct inode *inode); 2620 extern int ext4_read_inline_dir(struct file *filp, 2621 struct dir_context *ctx, 2622 int *has_inline_data); 2623 extern int htree_inlinedir_to_tree(struct file *dir_file, 2624 struct inode *dir, ext4_lblk_t block, 2625 struct dx_hash_info *hinfo, 2626 __u32 start_hash, __u32 start_minor_hash, 2627 int *has_inline_data); 2628 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 2629 const struct qstr *d_name, 2630 struct ext4_dir_entry_2 **res_dir, 2631 int *has_inline_data); 2632 extern int ext4_delete_inline_entry(handle_t *handle, 2633 struct inode *dir, 2634 struct ext4_dir_entry_2 *de_del, 2635 struct buffer_head *bh, 2636 int *has_inline_data); 2637 extern int empty_inline_dir(struct inode *dir, int *has_inline_data); 2638 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 2639 struct ext4_dir_entry_2 **parent_de, 2640 int *retval); 2641 extern int ext4_inline_data_fiemap(struct inode *inode, 2642 struct fiemap_extent_info *fieinfo, 2643 int *has_inline); 2644 extern int ext4_try_to_evict_inline_data(handle_t *handle, 2645 struct inode *inode, 2646 int needed); 2647 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline); 2648 2649 extern int ext4_convert_inline_data(struct inode *inode); 2650 2651 /* namei.c */ 2652 extern const struct inode_operations ext4_dir_inode_operations; 2653 extern const struct inode_operations ext4_special_inode_operations; 2654 extern struct dentry *ext4_get_parent(struct dentry *child); 2655 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 2656 struct ext4_dir_entry_2 *de, 2657 int blocksize, int csum_size, 2658 unsigned int parent_ino, int dotdot_real_len); 2659 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t, 2660 unsigned int blocksize); 2661 extern int ext4_handle_dirty_dirent_node(handle_t *handle, 2662 struct inode *inode, 2663 struct buffer_head *bh); 2664 #define S_SHIFT 12 2665 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = { 2666 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 2667 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 2668 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 2669 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 2670 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 2671 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 2672 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 2673 }; 2674 2675 static inline void ext4_set_de_type(struct super_block *sb, 2676 struct ext4_dir_entry_2 *de, 2677 umode_t mode) { 2678 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE)) 2679 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 2680 } 2681 2682 2683 /* symlink.c */ 2684 extern const struct inode_operations ext4_symlink_inode_operations; 2685 extern const struct inode_operations ext4_fast_symlink_inode_operations; 2686 2687 /* block_validity */ 2688 extern void ext4_release_system_zone(struct super_block *sb); 2689 extern int ext4_setup_system_zone(struct super_block *sb); 2690 extern int __init ext4_init_system_zone(void); 2691 extern void ext4_exit_system_zone(void); 2692 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 2693 ext4_fsblk_t start_blk, 2694 unsigned int count); 2695 extern int ext4_check_blockref(const char *, unsigned int, 2696 struct inode *, __le32 *, unsigned int); 2697 2698 /* extents.c */ 2699 struct ext4_ext_path; 2700 struct ext4_extent; 2701 2702 /* 2703 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 2704 * __le32. 2705 */ 2706 #define EXT_MAX_BLOCKS 0xffffffff 2707 2708 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 2709 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 2710 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 2711 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 2712 struct ext4_map_blocks *map, int flags); 2713 extern void ext4_ext_truncate(handle_t *, struct inode *); 2714 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 2715 ext4_lblk_t end); 2716 extern void ext4_ext_init(struct super_block *); 2717 extern void ext4_ext_release(struct super_block *); 2718 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 2719 loff_t len); 2720 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 2721 loff_t offset, ssize_t len); 2722 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 2723 struct ext4_map_blocks *map, int flags); 2724 extern int ext4_ext_calc_metadata_amount(struct inode *inode, 2725 ext4_lblk_t lblocks); 2726 extern int ext4_extent_tree_init(handle_t *, struct inode *); 2727 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 2728 int num, 2729 struct ext4_ext_path *path); 2730 extern int ext4_can_extents_be_merged(struct inode *inode, 2731 struct ext4_extent *ex1, 2732 struct ext4_extent *ex2); 2733 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 2734 struct ext4_ext_path *, 2735 struct ext4_extent *, int); 2736 extern struct ext4_ext_path *ext4_ext_find_extent(struct inode *, ext4_lblk_t, 2737 struct ext4_ext_path *, 2738 int flags); 2739 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 2740 extern int ext4_ext_check_inode(struct inode *inode); 2741 extern int ext4_find_delalloc_range(struct inode *inode, 2742 ext4_lblk_t lblk_start, 2743 ext4_lblk_t lblk_end); 2744 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk); 2745 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2746 __u64 start, __u64 len); 2747 extern int ext4_ext_precache(struct inode *inode); 2748 2749 /* move_extent.c */ 2750 extern void ext4_double_down_write_data_sem(struct inode *first, 2751 struct inode *second); 2752 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 2753 struct inode *donor_inode); 2754 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 2755 __u64 start_orig, __u64 start_donor, 2756 __u64 len, __u64 *moved_len); 2757 2758 /* page-io.c */ 2759 extern int __init ext4_init_pageio(void); 2760 extern void ext4_exit_pageio(void); 2761 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 2762 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 2763 extern int ext4_put_io_end(ext4_io_end_t *io_end); 2764 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 2765 extern void ext4_io_submit_init(struct ext4_io_submit *io, 2766 struct writeback_control *wbc); 2767 extern void ext4_end_io_rsv_work(struct work_struct *work); 2768 extern void ext4_io_submit(struct ext4_io_submit *io); 2769 extern int ext4_bio_write_page(struct ext4_io_submit *io, 2770 struct page *page, 2771 int len, 2772 struct writeback_control *wbc); 2773 2774 /* mmp.c */ 2775 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 2776 extern void ext4_mmp_csum_set(struct super_block *sb, struct mmp_struct *mmp); 2777 extern int ext4_mmp_csum_verify(struct super_block *sb, 2778 struct mmp_struct *mmp); 2779 2780 /* 2781 * Note that these flags will never ever appear in a buffer_head's state flag. 2782 * See EXT4_MAP_... to see where this is used. 2783 */ 2784 enum ext4_state_bits { 2785 BH_Uninit /* blocks are allocated but uninitialized on disk */ 2786 = BH_JBDPrivateStart, 2787 BH_AllocFromCluster, /* allocated blocks were part of already 2788 * allocated cluster. */ 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