1 /* 2 * ext4.h 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/include/linux/minix_fs.h 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 */ 15 16 #ifndef _EXT4_H 17 #define _EXT4_H 18 19 #include <linux/types.h> 20 #include <linux/blkdev.h> 21 #include <linux/magic.h> 22 #include <linux/jbd2.h> 23 #include <linux/quota.h> 24 #include <linux/rwsem.h> 25 #include <linux/rbtree.h> 26 #include <linux/seqlock.h> 27 #include <linux/mutex.h> 28 #include <linux/timer.h> 29 #include <linux/wait.h> 30 #include <linux/blockgroup_lock.h> 31 #include <linux/percpu_counter.h> 32 #include <linux/ratelimit.h> 33 #include <crypto/hash.h> 34 #include <linux/falloc.h> 35 #ifdef __KERNEL__ 36 #include <linux/compat.h> 37 #endif 38 39 /* 40 * The fourth extended filesystem constants/structures 41 */ 42 43 /* 44 * Define EXT4FS_DEBUG to produce debug messages 45 */ 46 #undef EXT4FS_DEBUG 47 48 /* 49 * Debug code 50 */ 51 #ifdef EXT4FS_DEBUG 52 #define ext4_debug(f, a...) \ 53 do { \ 54 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 55 __FILE__, __LINE__, __func__); \ 56 printk(KERN_DEBUG f, ## a); \ 57 } while (0) 58 #else 59 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 60 #endif 61 62 /* 63 * Turn on EXT_DEBUG to get lots of info about extents operations. 64 */ 65 #define EXT_DEBUG__ 66 #ifdef EXT_DEBUG 67 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__) 68 #else 69 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 70 #endif 71 72 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 73 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 74 75 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 76 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 77 78 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 79 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 80 81 /* data type for block offset of block group */ 82 typedef int ext4_grpblk_t; 83 84 /* data type for filesystem-wide blocks number */ 85 typedef unsigned long long ext4_fsblk_t; 86 87 /* data type for file logical block number */ 88 typedef __u32 ext4_lblk_t; 89 90 /* data type for block group number */ 91 typedef unsigned int ext4_group_t; 92 93 /* 94 * Flags used in mballoc's allocation_context flags field. 95 * 96 * Also used to show what's going on for debugging purposes when the 97 * flag field is exported via the traceport interface 98 */ 99 100 /* prefer goal again. length */ 101 #define EXT4_MB_HINT_MERGE 0x0001 102 /* blocks already reserved */ 103 #define EXT4_MB_HINT_RESERVED 0x0002 104 /* metadata is being allocated */ 105 #define EXT4_MB_HINT_METADATA 0x0004 106 /* first blocks in the file */ 107 #define EXT4_MB_HINT_FIRST 0x0008 108 /* search for the best chunk */ 109 #define EXT4_MB_HINT_BEST 0x0010 110 /* data is being allocated */ 111 #define EXT4_MB_HINT_DATA 0x0020 112 /* don't preallocate (for tails) */ 113 #define EXT4_MB_HINT_NOPREALLOC 0x0040 114 /* allocate for locality group */ 115 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 116 /* allocate goal blocks or none */ 117 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 118 /* goal is meaningful */ 119 #define EXT4_MB_HINT_TRY_GOAL 0x0200 120 /* blocks already pre-reserved by delayed allocation */ 121 #define EXT4_MB_DELALLOC_RESERVED 0x0400 122 /* We are doing stream allocation */ 123 #define EXT4_MB_STREAM_ALLOC 0x0800 124 /* Use reserved root blocks if needed */ 125 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 126 /* Use blocks from reserved pool */ 127 #define EXT4_MB_USE_RESERVED 0x2000 128 129 struct ext4_allocation_request { 130 /* target inode for block we're allocating */ 131 struct inode *inode; 132 /* how many blocks we want to allocate */ 133 unsigned int len; 134 /* logical block in target inode */ 135 ext4_lblk_t logical; 136 /* the closest logical allocated block to the left */ 137 ext4_lblk_t lleft; 138 /* the closest logical allocated block to the right */ 139 ext4_lblk_t lright; 140 /* phys. target (a hint) */ 141 ext4_fsblk_t goal; 142 /* phys. block for the closest logical allocated block to the left */ 143 ext4_fsblk_t pleft; 144 /* phys. block for the closest logical allocated block to the right */ 145 ext4_fsblk_t pright; 146 /* flags. see above EXT4_MB_HINT_* */ 147 unsigned int flags; 148 }; 149 150 /* 151 * Logical to physical block mapping, used by ext4_map_blocks() 152 * 153 * This structure is used to pass requests into ext4_map_blocks() as 154 * well as to store the information returned by ext4_map_blocks(). It 155 * takes less room on the stack than a struct buffer_head. 156 */ 157 #define EXT4_MAP_NEW (1 << BH_New) 158 #define EXT4_MAP_MAPPED (1 << BH_Mapped) 159 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 160 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 161 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 162 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 163 164 struct ext4_map_blocks { 165 ext4_fsblk_t m_pblk; 166 ext4_lblk_t m_lblk; 167 unsigned int m_len; 168 unsigned int m_flags; 169 }; 170 171 /* 172 * Flags for ext4_io_end->flags 173 */ 174 #define EXT4_IO_END_UNWRITTEN 0x0001 175 176 /* 177 * For converting unwritten extents on a work queue. 'handle' is used for 178 * buffered writeback. 179 */ 180 typedef struct ext4_io_end { 181 struct list_head list; /* per-file finished IO list */ 182 handle_t *handle; /* handle reserved for extent 183 * conversion */ 184 struct inode *inode; /* file being written to */ 185 struct bio *bio; /* Linked list of completed 186 * bios covering the extent */ 187 unsigned int flag; /* unwritten or not */ 188 loff_t offset; /* offset in the file */ 189 ssize_t size; /* size of the extent */ 190 atomic_t count; /* reference counter */ 191 } ext4_io_end_t; 192 193 struct ext4_io_submit { 194 int io_op; 195 struct bio *io_bio; 196 ext4_io_end_t *io_end; 197 sector_t io_next_block; 198 }; 199 200 /* 201 * Special inodes numbers 202 */ 203 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 204 #define EXT4_ROOT_INO 2 /* Root inode */ 205 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 206 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 207 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 208 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 209 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 210 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 211 212 /* First non-reserved inode for old ext4 filesystems */ 213 #define EXT4_GOOD_OLD_FIRST_INO 11 214 215 /* 216 * Maximal count of links to a file 217 */ 218 #define EXT4_LINK_MAX 65000 219 220 /* 221 * Macro-instructions used to manage several block sizes 222 */ 223 #define EXT4_MIN_BLOCK_SIZE 1024 224 #define EXT4_MAX_BLOCK_SIZE 65536 225 #define EXT4_MIN_BLOCK_LOG_SIZE 10 226 #define EXT4_MAX_BLOCK_LOG_SIZE 16 227 #ifdef __KERNEL__ 228 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 229 #else 230 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 231 #endif 232 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 233 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 234 EXT4_SB(s)->s_cluster_bits) 235 #ifdef __KERNEL__ 236 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 237 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 238 #else 239 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 240 #endif 241 #ifdef __KERNEL__ 242 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 243 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 244 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 245 #else 246 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 247 EXT4_GOOD_OLD_INODE_SIZE : \ 248 (s)->s_inode_size) 249 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 250 EXT4_GOOD_OLD_FIRST_INO : \ 251 (s)->s_first_ino) 252 #endif 253 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 254 255 /* Translate a block number to a cluster number */ 256 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 257 /* Translate a cluster number to a block number */ 258 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 259 /* Translate # of blks to # of clusters */ 260 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 261 (sbi)->s_cluster_bits) 262 /* Mask out the low bits to get the starting block of the cluster */ 263 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 264 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 265 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 266 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 267 /* Get the cluster offset */ 268 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 269 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 270 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 271 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 272 273 /* 274 * Structure of a blocks group descriptor 275 */ 276 struct ext4_group_desc 277 { 278 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 279 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 280 __le32 bg_inode_table_lo; /* Inodes table block */ 281 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 282 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 283 __le16 bg_used_dirs_count_lo; /* Directories count */ 284 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 285 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 286 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 287 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 288 __le16 bg_itable_unused_lo; /* Unused inodes count */ 289 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 290 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 291 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 292 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 293 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 294 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 295 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 296 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 297 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 298 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 299 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 300 __u32 bg_reserved; 301 }; 302 303 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 304 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 305 sizeof(__le16)) 306 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 307 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 308 sizeof(__le16)) 309 310 /* 311 * Structure of a flex block group info 312 */ 313 314 struct flex_groups { 315 atomic64_t free_clusters; 316 atomic_t free_inodes; 317 atomic_t used_dirs; 318 }; 319 320 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 321 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 322 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 323 324 /* 325 * Macro-instructions used to manage group descriptors 326 */ 327 #define EXT4_MIN_DESC_SIZE 32 328 #define EXT4_MIN_DESC_SIZE_64BIT 64 329 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 330 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 331 #ifdef __KERNEL__ 332 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 333 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 334 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 335 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 336 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 337 #else 338 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 339 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 340 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 341 #endif 342 343 /* 344 * Constants relative to the data blocks 345 */ 346 #define EXT4_NDIR_BLOCKS 12 347 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 348 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 349 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 350 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 351 352 /* 353 * Inode flags 354 */ 355 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 356 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 357 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 358 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 359 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 360 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 361 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 362 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 363 /* Reserved for compression usage... */ 364 #define EXT4_DIRTY_FL 0x00000100 365 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 366 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 367 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 368 /* End compression flags --- maybe not all used */ 369 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 370 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 371 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 372 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 373 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 374 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 375 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 376 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 377 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 378 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 379 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 380 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 381 382 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 383 #define EXT4_FL_USER_MODIFIABLE 0x004380FF /* User modifiable flags */ 384 385 /* Flags that should be inherited by new inodes from their parent. */ 386 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 387 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 388 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 389 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 390 391 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 392 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 393 394 /* Flags that are appropriate for non-directories/regular files. */ 395 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 396 397 /* Mask out flags that are inappropriate for the given type of inode. */ 398 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 399 { 400 if (S_ISDIR(mode)) 401 return flags; 402 else if (S_ISREG(mode)) 403 return flags & EXT4_REG_FLMASK; 404 else 405 return flags & EXT4_OTHER_FLMASK; 406 } 407 408 /* 409 * Inode flags used for atomic set/get 410 */ 411 enum { 412 EXT4_INODE_SECRM = 0, /* Secure deletion */ 413 EXT4_INODE_UNRM = 1, /* Undelete */ 414 EXT4_INODE_COMPR = 2, /* Compress file */ 415 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 416 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 417 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 418 EXT4_INODE_NODUMP = 6, /* do not dump file */ 419 EXT4_INODE_NOATIME = 7, /* do not update atime */ 420 /* Reserved for compression usage... */ 421 EXT4_INODE_DIRTY = 8, 422 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 423 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 424 EXT4_INODE_ECOMPR = 11, /* Compression error */ 425 /* End compression flags --- maybe not all used */ 426 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 427 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 428 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 429 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 430 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 431 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 432 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 433 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 434 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 435 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 436 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 437 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 438 }; 439 440 /* 441 * Since it's pretty easy to mix up bit numbers and hex values, we use a 442 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 443 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 444 * any extra space in the compiled kernel image, otherwise, the build will fail. 445 * It's important that these values are the same, since we are using 446 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 447 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 448 * values found in ext2, ext3 and ext4 filesystems, and of course the values 449 * defined in e2fsprogs. 450 * 451 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 452 */ 453 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 454 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 455 456 static inline void ext4_check_flag_values(void) 457 { 458 CHECK_FLAG_VALUE(SECRM); 459 CHECK_FLAG_VALUE(UNRM); 460 CHECK_FLAG_VALUE(COMPR); 461 CHECK_FLAG_VALUE(SYNC); 462 CHECK_FLAG_VALUE(IMMUTABLE); 463 CHECK_FLAG_VALUE(APPEND); 464 CHECK_FLAG_VALUE(NODUMP); 465 CHECK_FLAG_VALUE(NOATIME); 466 CHECK_FLAG_VALUE(DIRTY); 467 CHECK_FLAG_VALUE(COMPRBLK); 468 CHECK_FLAG_VALUE(NOCOMPR); 469 CHECK_FLAG_VALUE(ECOMPR); 470 CHECK_FLAG_VALUE(INDEX); 471 CHECK_FLAG_VALUE(IMAGIC); 472 CHECK_FLAG_VALUE(JOURNAL_DATA); 473 CHECK_FLAG_VALUE(NOTAIL); 474 CHECK_FLAG_VALUE(DIRSYNC); 475 CHECK_FLAG_VALUE(TOPDIR); 476 CHECK_FLAG_VALUE(HUGE_FILE); 477 CHECK_FLAG_VALUE(EXTENTS); 478 CHECK_FLAG_VALUE(EA_INODE); 479 CHECK_FLAG_VALUE(EOFBLOCKS); 480 CHECK_FLAG_VALUE(INLINE_DATA); 481 CHECK_FLAG_VALUE(RESERVED); 482 } 483 484 /* Used to pass group descriptor data when online resize is done */ 485 struct ext4_new_group_input { 486 __u32 group; /* Group number for this data */ 487 __u64 block_bitmap; /* Absolute block number of block bitmap */ 488 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 489 __u64 inode_table; /* Absolute block number of inode table start */ 490 __u32 blocks_count; /* Total number of blocks in this group */ 491 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 492 __u16 unused; 493 }; 494 495 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 496 struct compat_ext4_new_group_input { 497 u32 group; 498 compat_u64 block_bitmap; 499 compat_u64 inode_bitmap; 500 compat_u64 inode_table; 501 u32 blocks_count; 502 u16 reserved_blocks; 503 u16 unused; 504 }; 505 #endif 506 507 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 508 struct ext4_new_group_data { 509 __u32 group; 510 __u64 block_bitmap; 511 __u64 inode_bitmap; 512 __u64 inode_table; 513 __u32 blocks_count; 514 __u16 reserved_blocks; 515 __u16 unused; 516 __u32 free_blocks_count; 517 }; 518 519 /* Indexes used to index group tables in ext4_new_group_data */ 520 enum { 521 BLOCK_BITMAP = 0, /* block bitmap */ 522 INODE_BITMAP, /* inode bitmap */ 523 INODE_TABLE, /* inode tables */ 524 GROUP_TABLE_COUNT, 525 }; 526 527 /* 528 * Flags used by ext4_map_blocks() 529 */ 530 /* Allocate any needed blocks and/or convert an unwritten 531 extent to be an initialized ext4 */ 532 #define EXT4_GET_BLOCKS_CREATE 0x0001 533 /* Request the creation of an unwritten extent */ 534 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 535 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 536 EXT4_GET_BLOCKS_CREATE) 537 /* Caller is from the delayed allocation writeout path 538 * finally doing the actual allocation of delayed blocks */ 539 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 540 /* caller is from the direct IO path, request to creation of an 541 unwritten extents if not allocated, split the unwritten 542 extent if blocks has been preallocated already*/ 543 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 544 #define EXT4_GET_BLOCKS_CONVERT 0x0010 545 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 546 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 547 /* Convert extent to initialized after IO complete */ 548 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 549 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 550 /* Eventual metadata allocation (due to growing extent tree) 551 * should not fail, so try to use reserved blocks for that.*/ 552 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 553 /* Don't normalize allocation size (used for fallocate) */ 554 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 555 /* Request will not result in inode size update (user for fallocate) */ 556 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 557 /* Do not take i_data_sem locking in ext4_map_blocks */ 558 #define EXT4_GET_BLOCKS_NO_LOCK 0x0100 559 /* Convert written extents to unwritten */ 560 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0200 561 562 /* 563 * The bit position of these flags must not overlap with any of the 564 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 565 * read_extent_tree_block(), ext4_split_extent_at(), 566 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 567 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 568 * caching the extents when reading from the extent tree while a 569 * truncate or punch hole operation is in progress. 570 */ 571 #define EXT4_EX_NOCACHE 0x40000000 572 #define EXT4_EX_FORCE_CACHE 0x20000000 573 574 /* 575 * Flags used by ext4_free_blocks 576 */ 577 #define EXT4_FREE_BLOCKS_METADATA 0x0001 578 #define EXT4_FREE_BLOCKS_FORGET 0x0002 579 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 580 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 581 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 582 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 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 else \ 765 (einode)->xtime.tv_sec = 0; \ 766 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 767 ext4_decode_extra_time(&(einode)->xtime, \ 768 raw_inode->xtime ## _extra); \ 769 else \ 770 (einode)->xtime.tv_nsec = 0; \ 771 } while (0) 772 773 #define i_disk_version osd1.linux1.l_i_version 774 775 #if defined(__KERNEL__) || defined(__linux__) 776 #define i_reserved1 osd1.linux1.l_i_reserved1 777 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 778 #define i_blocks_high osd2.linux2.l_i_blocks_high 779 #define i_uid_low i_uid 780 #define i_gid_low i_gid 781 #define i_uid_high osd2.linux2.l_i_uid_high 782 #define i_gid_high osd2.linux2.l_i_gid_high 783 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 784 785 #elif defined(__GNU__) 786 787 #define i_translator osd1.hurd1.h_i_translator 788 #define i_uid_high osd2.hurd2.h_i_uid_high 789 #define i_gid_high osd2.hurd2.h_i_gid_high 790 #define i_author osd2.hurd2.h_i_author 791 792 #elif defined(__masix__) 793 794 #define i_reserved1 osd1.masix1.m_i_reserved1 795 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 796 #define i_reserved2 osd2.masix2.m_i_reserved2 797 798 #endif /* defined(__KERNEL__) || defined(__linux__) */ 799 800 #include "extents_status.h" 801 802 /* 803 * fourth extended file system inode data in memory 804 */ 805 struct ext4_inode_info { 806 __le32 i_data[15]; /* unconverted */ 807 __u32 i_dtime; 808 ext4_fsblk_t i_file_acl; 809 810 /* 811 * i_block_group is the number of the block group which contains 812 * this file's inode. Constant across the lifetime of the inode, 813 * it is ued for making block allocation decisions - we try to 814 * place a file's data blocks near its inode block, and new inodes 815 * near to their parent directory's inode. 816 */ 817 ext4_group_t i_block_group; 818 ext4_lblk_t i_dir_start_lookup; 819 #if (BITS_PER_LONG < 64) 820 unsigned long i_state_flags; /* Dynamic state flags */ 821 #endif 822 unsigned long i_flags; 823 824 /* 825 * Extended attributes can be read independently of the main file 826 * data. Taking i_mutex even when reading would cause contention 827 * between readers of EAs and writers of regular file data, so 828 * instead we synchronize on xattr_sem when reading or changing 829 * EAs. 830 */ 831 struct rw_semaphore xattr_sem; 832 833 struct list_head i_orphan; /* unlinked but open inodes */ 834 835 /* 836 * i_disksize keeps track of what the inode size is ON DISK, not 837 * in memory. During truncate, i_size is set to the new size by 838 * the VFS prior to calling ext4_truncate(), but the filesystem won't 839 * set i_disksize to 0 until the truncate is actually under way. 840 * 841 * The intent is that i_disksize always represents the blocks which 842 * are used by this file. This allows recovery to restart truncate 843 * on orphans if we crash during truncate. We actually write i_disksize 844 * into the on-disk inode when writing inodes out, instead of i_size. 845 * 846 * The only time when i_disksize and i_size may be different is when 847 * a truncate is in progress. The only things which change i_disksize 848 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 849 */ 850 loff_t i_disksize; 851 852 /* 853 * i_data_sem is for serialising ext4_truncate() against 854 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 855 * data tree are chopped off during truncate. We can't do that in 856 * ext4 because whenever we perform intermediate commits during 857 * truncate, the inode and all the metadata blocks *must* be in a 858 * consistent state which allows truncation of the orphans to restart 859 * during recovery. Hence we must fix the get_block-vs-truncate race 860 * by other means, so we have i_data_sem. 861 */ 862 struct rw_semaphore i_data_sem; 863 struct inode vfs_inode; 864 struct jbd2_inode *jinode; 865 866 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 867 868 /* 869 * File creation time. Its function is same as that of 870 * struct timespec i_{a,c,m}time in the generic inode. 871 */ 872 struct timespec i_crtime; 873 874 /* mballoc */ 875 struct list_head i_prealloc_list; 876 spinlock_t i_prealloc_lock; 877 878 /* extents status tree */ 879 struct ext4_es_tree i_es_tree; 880 rwlock_t i_es_lock; 881 struct list_head i_es_lru; 882 unsigned int i_es_all_nr; /* protected by i_es_lock */ 883 unsigned int i_es_lru_nr; /* protected by i_es_lock */ 884 unsigned long i_touch_when; /* jiffies of last accessing */ 885 886 /* ialloc */ 887 ext4_group_t i_last_alloc_group; 888 889 /* allocation reservation info for delalloc */ 890 /* In case of bigalloc, these refer to clusters rather than blocks */ 891 unsigned int i_reserved_data_blocks; 892 unsigned int i_reserved_meta_blocks; 893 unsigned int i_allocated_meta_blocks; 894 ext4_lblk_t i_da_metadata_calc_last_lblock; 895 int i_da_metadata_calc_len; 896 897 /* on-disk additional length */ 898 __u16 i_extra_isize; 899 900 /* Indicate the inline data space. */ 901 u16 i_inline_off; 902 u16 i_inline_size; 903 904 #ifdef CONFIG_QUOTA 905 /* quota space reservation, managed internally by quota code */ 906 qsize_t i_reserved_quota; 907 #endif 908 909 /* Lock protecting lists below */ 910 spinlock_t i_completed_io_lock; 911 /* 912 * Completed IOs that need unwritten extents handling and have 913 * transaction reserved 914 */ 915 struct list_head i_rsv_conversion_list; 916 /* 917 * Completed IOs that need unwritten extents handling and don't have 918 * transaction reserved 919 */ 920 atomic_t i_ioend_count; /* Number of outstanding io_end structs */ 921 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 922 struct work_struct i_rsv_conversion_work; 923 924 spinlock_t i_block_reservation_lock; 925 926 /* 927 * Transactions that contain inode's metadata needed to complete 928 * fsync and fdatasync, respectively. 929 */ 930 tid_t i_sync_tid; 931 tid_t i_datasync_tid; 932 933 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 934 __u32 i_csum_seed; 935 }; 936 937 /* 938 * File system states 939 */ 940 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 941 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 942 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 943 944 /* 945 * Misc. filesystem flags 946 */ 947 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 948 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 949 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 950 951 /* 952 * Mount flags set via mount options or defaults 953 */ 954 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 955 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 956 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 957 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 958 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 959 #define EXT4_MOUNT_ERRORS_MASK 0x00070 960 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 961 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 962 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 963 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 964 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 965 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 966 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 967 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 968 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 969 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 970 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 971 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 972 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 973 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 974 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 975 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 976 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 977 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 978 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 979 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 980 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 981 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 982 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 983 984 /* 985 * Mount flags set either automatically (could not be set by mount option) 986 * based on per file system feature or property or in special cases such as 987 * distinguishing between explicit mount option definition and default. 988 */ 989 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 990 specified delalloc */ 991 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 992 size of blocksize * 8 993 blocks */ 994 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 995 file systems */ 996 997 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 998 ~EXT4_MOUNT_##opt 999 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1000 EXT4_MOUNT_##opt 1001 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1002 EXT4_MOUNT_##opt) 1003 1004 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1005 ~EXT4_MOUNT2_##opt 1006 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1007 EXT4_MOUNT2_##opt 1008 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1009 EXT4_MOUNT2_##opt) 1010 1011 #define ext4_test_and_set_bit __test_and_set_bit_le 1012 #define ext4_set_bit __set_bit_le 1013 #define ext4_set_bit_atomic ext2_set_bit_atomic 1014 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1015 #define ext4_clear_bit __clear_bit_le 1016 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1017 #define ext4_test_bit test_bit_le 1018 #define ext4_find_next_zero_bit find_next_zero_bit_le 1019 #define ext4_find_next_bit find_next_bit_le 1020 1021 extern void ext4_set_bits(void *bm, int cur, int len); 1022 1023 /* 1024 * Maximal mount counts between two filesystem checks 1025 */ 1026 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1027 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1028 1029 /* 1030 * Behaviour when detecting errors 1031 */ 1032 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1033 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1034 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1035 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1036 1037 /* Metadata checksum algorithm codes */ 1038 #define EXT4_CRC32C_CHKSUM 1 1039 1040 /* 1041 * Structure of the super block 1042 */ 1043 struct ext4_super_block { 1044 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1045 __le32 s_blocks_count_lo; /* Blocks count */ 1046 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1047 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1048 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1049 __le32 s_first_data_block; /* First Data Block */ 1050 __le32 s_log_block_size; /* Block size */ 1051 __le32 s_log_cluster_size; /* Allocation cluster size */ 1052 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1053 __le32 s_clusters_per_group; /* # Clusters per group */ 1054 __le32 s_inodes_per_group; /* # Inodes per group */ 1055 __le32 s_mtime; /* Mount time */ 1056 /*30*/ __le32 s_wtime; /* Write time */ 1057 __le16 s_mnt_count; /* Mount count */ 1058 __le16 s_max_mnt_count; /* Maximal mount count */ 1059 __le16 s_magic; /* Magic signature */ 1060 __le16 s_state; /* File system state */ 1061 __le16 s_errors; /* Behaviour when detecting errors */ 1062 __le16 s_minor_rev_level; /* minor revision level */ 1063 /*40*/ __le32 s_lastcheck; /* time of last check */ 1064 __le32 s_checkinterval; /* max. time between checks */ 1065 __le32 s_creator_os; /* OS */ 1066 __le32 s_rev_level; /* Revision level */ 1067 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1068 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1069 /* 1070 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1071 * 1072 * Note: the difference between the compatible feature set and 1073 * the incompatible feature set is that if there is a bit set 1074 * in the incompatible feature set that the kernel doesn't 1075 * know about, it should refuse to mount the filesystem. 1076 * 1077 * e2fsck's requirements are more strict; if it doesn't know 1078 * about a feature in either the compatible or incompatible 1079 * feature set, it must abort and not try to meddle with 1080 * things it doesn't understand... 1081 */ 1082 __le32 s_first_ino; /* First non-reserved inode */ 1083 __le16 s_inode_size; /* size of inode structure */ 1084 __le16 s_block_group_nr; /* block group # of this superblock */ 1085 __le32 s_feature_compat; /* compatible feature set */ 1086 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1087 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1088 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1089 /*78*/ char s_volume_name[16]; /* volume name */ 1090 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 1091 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1092 /* 1093 * Performance hints. Directory preallocation should only 1094 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1095 */ 1096 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1097 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1098 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1099 /* 1100 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1101 */ 1102 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1103 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1104 __le32 s_journal_dev; /* device number of journal file */ 1105 __le32 s_last_orphan; /* start of list of inodes to delete */ 1106 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1107 __u8 s_def_hash_version; /* Default hash version to use */ 1108 __u8 s_jnl_backup_type; 1109 __le16 s_desc_size; /* size of group descriptor */ 1110 /*100*/ __le32 s_default_mount_opts; 1111 __le32 s_first_meta_bg; /* First metablock block group */ 1112 __le32 s_mkfs_time; /* When the filesystem was created */ 1113 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1114 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1115 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1116 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1117 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1118 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1119 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1120 __le32 s_flags; /* Miscellaneous flags */ 1121 __le16 s_raid_stride; /* RAID stride */ 1122 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1123 __le64 s_mmp_block; /* Block for multi-mount protection */ 1124 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1125 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1126 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1127 __le16 s_reserved_pad; 1128 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1129 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1130 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1131 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1132 snapshot's future use */ 1133 __le32 s_snapshot_list; /* inode number of the head of the 1134 on-disk snapshot list */ 1135 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1136 __le32 s_error_count; /* number of fs errors */ 1137 __le32 s_first_error_time; /* first time an error happened */ 1138 __le32 s_first_error_ino; /* inode involved in first error */ 1139 __le64 s_first_error_block; /* block involved of first error */ 1140 __u8 s_first_error_func[32]; /* function where the error happened */ 1141 __le32 s_first_error_line; /* line number where error happened */ 1142 __le32 s_last_error_time; /* most recent time of an error */ 1143 __le32 s_last_error_ino; /* inode involved in last error */ 1144 __le32 s_last_error_line; /* line number where error happened */ 1145 __le64 s_last_error_block; /* block involved of last error */ 1146 __u8 s_last_error_func[32]; /* function where the error happened */ 1147 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1148 __u8 s_mount_opts[64]; 1149 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1150 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1151 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1152 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1153 __le32 s_reserved[106]; /* Padding to the end of the block */ 1154 __le32 s_checksum; /* crc32c(superblock) */ 1155 }; 1156 1157 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1158 1159 #ifdef __KERNEL__ 1160 1161 /* 1162 * run-time mount flags 1163 */ 1164 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1165 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1166 1167 /* Number of quota types we support */ 1168 #define EXT4_MAXQUOTAS 2 1169 1170 /* 1171 * fourth extended-fs super-block data in memory 1172 */ 1173 struct ext4_sb_info { 1174 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1175 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1176 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1177 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1178 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1179 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1180 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1181 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1182 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1183 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1184 unsigned long s_overhead; /* # of fs overhead clusters */ 1185 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1186 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1187 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1188 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1189 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1190 struct buffer_head **s_group_desc; 1191 unsigned int s_mount_opt; 1192 unsigned int s_mount_opt2; 1193 unsigned int s_mount_flags; 1194 unsigned int s_def_mount_opt; 1195 ext4_fsblk_t s_sb_block; 1196 atomic64_t s_resv_clusters; 1197 kuid_t s_resuid; 1198 kgid_t s_resgid; 1199 unsigned short s_mount_state; 1200 unsigned short s_pad; 1201 int s_addr_per_block_bits; 1202 int s_desc_per_block_bits; 1203 int s_inode_size; 1204 int s_first_ino; 1205 unsigned int s_inode_readahead_blks; 1206 unsigned int s_inode_goal; 1207 spinlock_t s_next_gen_lock; 1208 u32 s_next_generation; 1209 u32 s_hash_seed[4]; 1210 int s_def_hash_version; 1211 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1212 struct percpu_counter s_freeclusters_counter; 1213 struct percpu_counter s_freeinodes_counter; 1214 struct percpu_counter s_dirs_counter; 1215 struct percpu_counter s_dirtyclusters_counter; 1216 struct blockgroup_lock *s_blockgroup_lock; 1217 struct proc_dir_entry *s_proc; 1218 struct kobject s_kobj; 1219 struct completion s_kobj_unregister; 1220 struct super_block *s_sb; 1221 1222 /* Journaling */ 1223 struct journal_s *s_journal; 1224 struct list_head s_orphan; 1225 struct mutex s_orphan_lock; 1226 unsigned long s_resize_flags; /* Flags indicating if there 1227 is a resizer */ 1228 unsigned long s_commit_interval; 1229 u32 s_max_batch_time; 1230 u32 s_min_batch_time; 1231 struct block_device *journal_bdev; 1232 #ifdef CONFIG_QUOTA 1233 char *s_qf_names[EXT4_MAXQUOTAS]; /* Names of quota files with journalled quota */ 1234 int s_jquota_fmt; /* Format of quota to use */ 1235 #endif 1236 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1237 struct rb_root system_blks; 1238 1239 #ifdef EXTENTS_STATS 1240 /* ext4 extents stats */ 1241 unsigned long s_ext_min; 1242 unsigned long s_ext_max; 1243 unsigned long s_depth_max; 1244 spinlock_t s_ext_stats_lock; 1245 unsigned long s_ext_blocks; 1246 unsigned long s_ext_extents; 1247 #endif 1248 1249 /* for buddy allocator */ 1250 struct ext4_group_info ***s_group_info; 1251 struct inode *s_buddy_cache; 1252 spinlock_t s_md_lock; 1253 unsigned short *s_mb_offsets; 1254 unsigned int *s_mb_maxs; 1255 unsigned int s_group_info_size; 1256 1257 /* tunables */ 1258 unsigned long s_stripe; 1259 unsigned int s_mb_stream_request; 1260 unsigned int s_mb_max_to_scan; 1261 unsigned int s_mb_min_to_scan; 1262 unsigned int s_mb_stats; 1263 unsigned int s_mb_order2_reqs; 1264 unsigned int s_mb_group_prealloc; 1265 unsigned int s_max_dir_size_kb; 1266 /* where last allocation was done - for stream allocation */ 1267 unsigned long s_mb_last_group; 1268 unsigned long s_mb_last_start; 1269 1270 /* stats for buddy allocator */ 1271 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1272 atomic_t s_bal_success; /* we found long enough chunks */ 1273 atomic_t s_bal_allocated; /* in blocks */ 1274 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1275 atomic_t s_bal_goals; /* goal hits */ 1276 atomic_t s_bal_breaks; /* too long searches */ 1277 atomic_t s_bal_2orders; /* 2^order hits */ 1278 spinlock_t s_bal_lock; 1279 unsigned long s_mb_buddies_generated; 1280 unsigned long long s_mb_generation_time; 1281 atomic_t s_mb_lost_chunks; 1282 atomic_t s_mb_preallocated; 1283 atomic_t s_mb_discarded; 1284 atomic_t s_lock_busy; 1285 1286 /* locality groups */ 1287 struct ext4_locality_group __percpu *s_locality_groups; 1288 1289 /* for write statistics */ 1290 unsigned long s_sectors_written_start; 1291 u64 s_kbytes_written; 1292 1293 /* the size of zero-out chunk */ 1294 unsigned int s_extent_max_zeroout_kb; 1295 1296 unsigned int s_log_groups_per_flex; 1297 struct flex_groups *s_flex_groups; 1298 ext4_group_t s_flex_groups_allocated; 1299 1300 /* workqueue for reserved extent conversions (buffered io) */ 1301 struct workqueue_struct *rsv_conversion_wq; 1302 1303 /* timer for periodic error stats printing */ 1304 struct timer_list s_err_report; 1305 1306 /* Lazy inode table initialization info */ 1307 struct ext4_li_request *s_li_request; 1308 /* Wait multiplier for lazy initialization thread */ 1309 unsigned int s_li_wait_mult; 1310 1311 /* Kernel thread for multiple mount protection */ 1312 struct task_struct *s_mmp_tsk; 1313 1314 /* record the last minlen when FITRIM is called. */ 1315 atomic_t s_last_trim_minblks; 1316 1317 /* Reference to checksum algorithm driver via cryptoapi */ 1318 struct crypto_shash *s_chksum_driver; 1319 1320 /* Precomputed FS UUID checksum for seeding other checksums */ 1321 __u32 s_csum_seed; 1322 1323 /* Reclaim extents from extent status tree */ 1324 struct shrinker s_es_shrinker; 1325 struct list_head s_es_lru; 1326 struct ext4_es_stats s_es_stats; 1327 struct mb_cache *s_mb_cache; 1328 spinlock_t s_es_lru_lock ____cacheline_aligned_in_smp; 1329 1330 /* Ratelimit ext4 messages. */ 1331 struct ratelimit_state s_err_ratelimit_state; 1332 struct ratelimit_state s_warning_ratelimit_state; 1333 struct ratelimit_state s_msg_ratelimit_state; 1334 }; 1335 1336 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1337 { 1338 return sb->s_fs_info; 1339 } 1340 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1341 { 1342 return container_of(inode, struct ext4_inode_info, vfs_inode); 1343 } 1344 1345 static inline struct timespec ext4_current_time(struct inode *inode) 1346 { 1347 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1348 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1349 } 1350 1351 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1352 { 1353 return ino == EXT4_ROOT_INO || 1354 ino == EXT4_USR_QUOTA_INO || 1355 ino == EXT4_GRP_QUOTA_INO || 1356 ino == EXT4_BOOT_LOADER_INO || 1357 ino == EXT4_JOURNAL_INO || 1358 ino == EXT4_RESIZE_INO || 1359 (ino >= EXT4_FIRST_INO(sb) && 1360 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1361 } 1362 1363 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 1364 struct ext4_io_end *io_end) 1365 { 1366 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 1367 io_end->flag |= EXT4_IO_END_UNWRITTEN; 1368 atomic_inc(&EXT4_I(inode)->i_unwritten); 1369 } 1370 } 1371 1372 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode) 1373 { 1374 return inode->i_private; 1375 } 1376 1377 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io) 1378 { 1379 inode->i_private = io; 1380 } 1381 1382 /* 1383 * Inode dynamic state flags 1384 */ 1385 enum { 1386 EXT4_STATE_JDATA, /* journaled data exists */ 1387 EXT4_STATE_NEW, /* inode is newly created */ 1388 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1389 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1390 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1391 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1392 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1393 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1394 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read 1395 nolocking */ 1396 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1397 EXT4_STATE_ORDERED_MODE, /* data=ordered mode */ 1398 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1399 }; 1400 1401 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1402 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1403 { \ 1404 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1405 } \ 1406 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1407 { \ 1408 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1409 } \ 1410 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1411 { \ 1412 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1413 } 1414 1415 /* Add these declarations here only so that these functions can be 1416 * found by name. Otherwise, they are very hard to locate. */ 1417 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1418 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1419 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1420 EXT4_INODE_BIT_FNS(flag, flags, 0) 1421 1422 /* Add these declarations here only so that these functions can be 1423 * found by name. Otherwise, they are very hard to locate. */ 1424 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1425 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1426 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1427 #if (BITS_PER_LONG < 64) 1428 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1429 1430 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1431 { 1432 (ei)->i_state_flags = 0; 1433 } 1434 #else 1435 EXT4_INODE_BIT_FNS(state, flags, 32) 1436 1437 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1438 { 1439 /* We depend on the fact that callers will set i_flags */ 1440 } 1441 #endif 1442 #else 1443 /* Assume that user mode programs are passing in an ext4fs superblock, not 1444 * a kernel struct super_block. This will allow us to call the feature-test 1445 * macros from user land. */ 1446 #define EXT4_SB(sb) (sb) 1447 #endif 1448 1449 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1450 1451 /* 1452 * Codes for operating systems 1453 */ 1454 #define EXT4_OS_LINUX 0 1455 #define EXT4_OS_HURD 1 1456 #define EXT4_OS_MASIX 2 1457 #define EXT4_OS_FREEBSD 3 1458 #define EXT4_OS_LITES 4 1459 1460 /* 1461 * Revision levels 1462 */ 1463 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1464 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1465 1466 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1467 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1468 1469 #define EXT4_GOOD_OLD_INODE_SIZE 128 1470 1471 /* 1472 * Feature set definitions 1473 */ 1474 1475 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1476 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1477 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1478 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1479 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1480 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1481 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1482 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1483 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1484 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1485 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1486 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1487 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1488 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1489 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1490 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1491 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1492 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1493 1494 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1495 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1496 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1497 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1498 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1499 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1500 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1501 1502 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1503 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1504 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1505 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1506 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1507 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1508 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1509 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1510 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1511 /* 1512 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1513 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1514 * all other data structures' checksums. However, the METADATA_CSUM and 1515 * GDT_CSUM bits are mutually exclusive. 1516 */ 1517 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1518 1519 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1520 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1521 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1522 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1523 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1524 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1525 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1526 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1527 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1528 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1529 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1530 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */ 1531 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1532 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1533 1534 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1535 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1536 EXT4_FEATURE_INCOMPAT_META_BG) 1537 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1538 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1539 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1540 1541 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1542 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1543 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1544 EXT4_FEATURE_INCOMPAT_META_BG) 1545 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1546 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1547 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1548 1549 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 1550 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1551 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1552 EXT4_FEATURE_INCOMPAT_META_BG| \ 1553 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1554 EXT4_FEATURE_INCOMPAT_64BIT| \ 1555 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1556 EXT4_FEATURE_INCOMPAT_MMP | \ 1557 EXT4_FEATURE_INCOMPAT_INLINE_DATA) 1558 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1559 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1560 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1561 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1562 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1563 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1564 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1565 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1566 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1567 EXT4_FEATURE_RO_COMPAT_QUOTA) 1568 1569 /* 1570 * Default values for user and/or group using reserved blocks 1571 */ 1572 #define EXT4_DEF_RESUID 0 1573 #define EXT4_DEF_RESGID 0 1574 1575 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1576 1577 /* 1578 * Default mount options 1579 */ 1580 #define EXT4_DEFM_DEBUG 0x0001 1581 #define EXT4_DEFM_BSDGROUPS 0x0002 1582 #define EXT4_DEFM_XATTR_USER 0x0004 1583 #define EXT4_DEFM_ACL 0x0008 1584 #define EXT4_DEFM_UID16 0x0010 1585 #define EXT4_DEFM_JMODE 0x0060 1586 #define EXT4_DEFM_JMODE_DATA 0x0020 1587 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1588 #define EXT4_DEFM_JMODE_WBACK 0x0060 1589 #define EXT4_DEFM_NOBARRIER 0x0100 1590 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1591 #define EXT4_DEFM_DISCARD 0x0400 1592 #define EXT4_DEFM_NODELALLOC 0x0800 1593 1594 /* 1595 * Default journal batch times 1596 */ 1597 #define EXT4_DEF_MIN_BATCH_TIME 0 1598 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1599 1600 /* 1601 * Minimum number of groups in a flexgroup before we separate out 1602 * directories into the first block group of a flexgroup 1603 */ 1604 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1605 1606 /* 1607 * Structure of a directory entry 1608 */ 1609 #define EXT4_NAME_LEN 255 1610 1611 struct ext4_dir_entry { 1612 __le32 inode; /* Inode number */ 1613 __le16 rec_len; /* Directory entry length */ 1614 __le16 name_len; /* Name length */ 1615 char name[EXT4_NAME_LEN]; /* File name */ 1616 }; 1617 1618 /* 1619 * The new version of the directory entry. Since EXT4 structures are 1620 * stored in intel byte order, and the name_len field could never be 1621 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1622 * file_type field. 1623 */ 1624 struct ext4_dir_entry_2 { 1625 __le32 inode; /* Inode number */ 1626 __le16 rec_len; /* Directory entry length */ 1627 __u8 name_len; /* Name length */ 1628 __u8 file_type; 1629 char name[EXT4_NAME_LEN]; /* File name */ 1630 }; 1631 1632 /* 1633 * This is a bogus directory entry at the end of each leaf block that 1634 * records checksums. 1635 */ 1636 struct ext4_dir_entry_tail { 1637 __le32 det_reserved_zero1; /* Pretend to be unused */ 1638 __le16 det_rec_len; /* 12 */ 1639 __u8 det_reserved_zero2; /* Zero name length */ 1640 __u8 det_reserved_ft; /* 0xDE, fake file type */ 1641 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1642 }; 1643 1644 #define EXT4_DIRENT_TAIL(block, blocksize) \ 1645 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 1646 ((blocksize) - \ 1647 sizeof(struct ext4_dir_entry_tail)))) 1648 1649 /* 1650 * Ext4 directory file types. Only the low 3 bits are used. The 1651 * other bits are reserved for now. 1652 */ 1653 #define EXT4_FT_UNKNOWN 0 1654 #define EXT4_FT_REG_FILE 1 1655 #define EXT4_FT_DIR 2 1656 #define EXT4_FT_CHRDEV 3 1657 #define EXT4_FT_BLKDEV 4 1658 #define EXT4_FT_FIFO 5 1659 #define EXT4_FT_SOCK 6 1660 #define EXT4_FT_SYMLINK 7 1661 1662 #define EXT4_FT_MAX 8 1663 1664 #define EXT4_FT_DIR_CSUM 0xDE 1665 1666 /* 1667 * EXT4_DIR_PAD defines the directory entries boundaries 1668 * 1669 * NOTE: It must be a multiple of 4 1670 */ 1671 #define EXT4_DIR_PAD 4 1672 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1673 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1674 ~EXT4_DIR_ROUND) 1675 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1676 1677 /* 1678 * If we ever get support for fs block sizes > page_size, we'll need 1679 * to remove the #if statements in the next two functions... 1680 */ 1681 static inline unsigned int 1682 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1683 { 1684 unsigned len = le16_to_cpu(dlen); 1685 1686 #if (PAGE_CACHE_SIZE >= 65536) 1687 if (len == EXT4_MAX_REC_LEN || len == 0) 1688 return blocksize; 1689 return (len & 65532) | ((len & 3) << 16); 1690 #else 1691 return len; 1692 #endif 1693 } 1694 1695 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1696 { 1697 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1698 BUG(); 1699 #if (PAGE_CACHE_SIZE >= 65536) 1700 if (len < 65536) 1701 return cpu_to_le16(len); 1702 if (len == blocksize) { 1703 if (blocksize == 65536) 1704 return cpu_to_le16(EXT4_MAX_REC_LEN); 1705 else 1706 return cpu_to_le16(0); 1707 } 1708 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 1709 #else 1710 return cpu_to_le16(len); 1711 #endif 1712 } 1713 1714 /* 1715 * Hash Tree Directory indexing 1716 * (c) Daniel Phillips, 2001 1717 */ 1718 1719 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 1720 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 1721 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 1722 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 1723 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 1724 1725 /* Legal values for the dx_root hash_version field: */ 1726 1727 #define DX_HASH_LEGACY 0 1728 #define DX_HASH_HALF_MD4 1 1729 #define DX_HASH_TEA 2 1730 #define DX_HASH_LEGACY_UNSIGNED 3 1731 #define DX_HASH_HALF_MD4_UNSIGNED 4 1732 #define DX_HASH_TEA_UNSIGNED 5 1733 1734 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 1735 const void *address, unsigned int length) 1736 { 1737 struct { 1738 struct shash_desc shash; 1739 char ctx[4]; 1740 } desc; 1741 int err; 1742 1743 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 1744 1745 desc.shash.tfm = sbi->s_chksum_driver; 1746 desc.shash.flags = 0; 1747 *(u32 *)desc.ctx = crc; 1748 1749 err = crypto_shash_update(&desc.shash, address, length); 1750 BUG_ON(err); 1751 1752 return *(u32 *)desc.ctx; 1753 } 1754 1755 #ifdef __KERNEL__ 1756 1757 /* hash info structure used by the directory hash */ 1758 struct dx_hash_info 1759 { 1760 u32 hash; 1761 u32 minor_hash; 1762 int hash_version; 1763 u32 *seed; 1764 }; 1765 1766 1767 /* 32 and 64 bit signed EOF for dx directories */ 1768 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 1769 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 1770 1771 1772 /* 1773 * Control parameters used by ext4_htree_next_block 1774 */ 1775 #define HASH_NB_ALWAYS 1 1776 1777 1778 /* 1779 * Describe an inode's exact location on disk and in memory 1780 */ 1781 struct ext4_iloc 1782 { 1783 struct buffer_head *bh; 1784 unsigned long offset; 1785 ext4_group_t block_group; 1786 }; 1787 1788 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 1789 { 1790 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 1791 } 1792 1793 /* 1794 * This structure is stuffed into the struct file's private_data field 1795 * for directories. It is where we put information so that we can do 1796 * readdir operations in hash tree order. 1797 */ 1798 struct dir_private_info { 1799 struct rb_root root; 1800 struct rb_node *curr_node; 1801 struct fname *extra_fname; 1802 loff_t last_pos; 1803 __u32 curr_hash; 1804 __u32 curr_minor_hash; 1805 __u32 next_hash; 1806 }; 1807 1808 /* calculate the first block number of the group */ 1809 static inline ext4_fsblk_t 1810 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 1811 { 1812 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 1813 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 1814 } 1815 1816 /* 1817 * Special error return code only used by dx_probe() and its callers. 1818 */ 1819 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 1820 1821 /* 1822 * Timeout and state flag for lazy initialization inode thread. 1823 */ 1824 #define EXT4_DEF_LI_WAIT_MULT 10 1825 #define EXT4_DEF_LI_MAX_START_DELAY 5 1826 #define EXT4_LAZYINIT_QUIT 0x0001 1827 #define EXT4_LAZYINIT_RUNNING 0x0002 1828 1829 /* 1830 * Lazy inode table initialization info 1831 */ 1832 struct ext4_lazy_init { 1833 unsigned long li_state; 1834 struct list_head li_request_list; 1835 struct mutex li_list_mtx; 1836 }; 1837 1838 struct ext4_li_request { 1839 struct super_block *lr_super; 1840 struct ext4_sb_info *lr_sbi; 1841 ext4_group_t lr_next_group; 1842 struct list_head lr_request; 1843 unsigned long lr_next_sched; 1844 unsigned long lr_timeout; 1845 }; 1846 1847 struct ext4_features { 1848 struct kobject f_kobj; 1849 struct completion f_kobj_unregister; 1850 }; 1851 1852 /* 1853 * This structure will be used for multiple mount protection. It will be 1854 * written into the block number saved in the s_mmp_block field in the 1855 * superblock. Programs that check MMP should assume that if 1856 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 1857 * to use the filesystem, regardless of how old the timestamp is. 1858 */ 1859 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 1860 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 1861 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 1862 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 1863 1864 struct mmp_struct { 1865 __le32 mmp_magic; /* Magic number for MMP */ 1866 __le32 mmp_seq; /* Sequence no. updated periodically */ 1867 1868 /* 1869 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 1870 * purposes and do not affect the correctness of the algorithm 1871 */ 1872 __le64 mmp_time; /* Time last updated */ 1873 char mmp_nodename[64]; /* Node which last updated MMP block */ 1874 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 1875 1876 /* 1877 * mmp_check_interval is used to verify if the MMP block has been 1878 * updated on the block device. The value is updated based on the 1879 * maximum time to write the MMP block during an update cycle. 1880 */ 1881 __le16 mmp_check_interval; 1882 1883 __le16 mmp_pad1; 1884 __le32 mmp_pad2[226]; 1885 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 1886 }; 1887 1888 /* arguments passed to the mmp thread */ 1889 struct mmpd_data { 1890 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 1891 struct super_block *sb; /* super block of the fs */ 1892 }; 1893 1894 /* 1895 * Check interval multiplier 1896 * The MMP block is written every update interval and initially checked every 1897 * update interval x the multiplier (the value is then adapted based on the 1898 * write latency). The reason is that writes can be delayed under load and we 1899 * don't want readers to incorrectly assume that the filesystem is no longer 1900 * in use. 1901 */ 1902 #define EXT4_MMP_CHECK_MULT 2UL 1903 1904 /* 1905 * Minimum interval for MMP checking in seconds. 1906 */ 1907 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 1908 1909 /* 1910 * Maximum interval for MMP checking in seconds. 1911 */ 1912 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 1913 1914 /* 1915 * Function prototypes 1916 */ 1917 1918 /* 1919 * Ok, these declarations are also in <linux/kernel.h> but none of the 1920 * ext4 source programs needs to include it so they are duplicated here. 1921 */ 1922 # define NORET_TYPE /**/ 1923 # define ATTRIB_NORET __attribute__((noreturn)) 1924 # define NORET_AND noreturn, 1925 1926 /* bitmap.c */ 1927 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 1928 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 1929 struct ext4_group_desc *gdp, 1930 struct buffer_head *bh, int sz); 1931 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 1932 struct ext4_group_desc *gdp, 1933 struct buffer_head *bh, int sz); 1934 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 1935 struct ext4_group_desc *gdp, 1936 struct buffer_head *bh); 1937 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 1938 struct ext4_group_desc *gdp, 1939 struct buffer_head *bh); 1940 1941 /* balloc.c */ 1942 extern void ext4_get_group_no_and_offset(struct super_block *sb, 1943 ext4_fsblk_t blocknr, 1944 ext4_group_t *blockgrpp, 1945 ext4_grpblk_t *offsetp); 1946 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 1947 ext4_fsblk_t block); 1948 1949 extern unsigned int ext4_block_group(struct super_block *sb, 1950 ext4_fsblk_t blocknr); 1951 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 1952 ext4_fsblk_t blocknr); 1953 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 1954 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 1955 ext4_group_t group); 1956 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 1957 ext4_fsblk_t goal, 1958 unsigned int flags, 1959 unsigned long *count, 1960 int *errp); 1961 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 1962 s64 nclusters, unsigned int flags); 1963 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 1964 extern void ext4_check_blocks_bitmap(struct super_block *); 1965 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 1966 ext4_group_t block_group, 1967 struct buffer_head ** bh); 1968 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1969 1970 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 1971 ext4_group_t block_group); 1972 extern int ext4_wait_block_bitmap(struct super_block *sb, 1973 ext4_group_t block_group, 1974 struct buffer_head *bh); 1975 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 1976 ext4_group_t block_group); 1977 extern unsigned ext4_free_clusters_after_init(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 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2023 void *buf, int buf_size); 2024 2025 /* fsync.c */ 2026 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2027 2028 /* hash.c */ 2029 extern int ext4fs_dirhash(const char *name, int len, struct 2030 dx_hash_info *hinfo); 2031 2032 /* ialloc.c */ 2033 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2034 const struct qstr *qstr, __u32 goal, 2035 uid_t *owner, int handle_type, 2036 unsigned int line_no, int nblocks); 2037 2038 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \ 2039 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2040 0, 0, 0) 2041 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2042 type, nblocks) \ 2043 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2044 (type), __LINE__, (nblocks)) 2045 2046 2047 extern void ext4_free_inode(handle_t *, struct inode *); 2048 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2049 extern unsigned long ext4_count_free_inodes(struct super_block *); 2050 extern unsigned long ext4_count_dirs(struct super_block *); 2051 extern void ext4_check_inodes_bitmap(struct super_block *); 2052 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2053 extern int ext4_init_inode_table(struct super_block *sb, 2054 ext4_group_t group, int barrier); 2055 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2056 2057 /* mballoc.c */ 2058 extern long ext4_mb_stats; 2059 extern long ext4_mb_max_to_scan; 2060 extern int ext4_mb_init(struct super_block *); 2061 extern int ext4_mb_release(struct super_block *); 2062 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2063 struct ext4_allocation_request *, int *); 2064 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2065 extern void ext4_discard_preallocations(struct inode *); 2066 extern int __init ext4_init_mballoc(void); 2067 extern void ext4_exit_mballoc(void); 2068 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2069 struct buffer_head *bh, ext4_fsblk_t block, 2070 unsigned long count, int flags); 2071 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2072 ext4_group_t ngroups); 2073 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2074 ext4_group_t i, struct ext4_group_desc *desc); 2075 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2076 ext4_fsblk_t block, unsigned long count); 2077 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2078 2079 /* inode.c */ 2080 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2081 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, 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 struct inode *ext4_iget_normal(struct super_block *, unsigned long); 2102 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2103 extern int ext4_setattr(struct dentry *, struct iattr *); 2104 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 2105 struct kstat *stat); 2106 extern void ext4_evict_inode(struct inode *); 2107 extern void ext4_clear_inode(struct inode *); 2108 extern int ext4_sync_inode(handle_t *, struct inode *); 2109 extern void ext4_dirty_inode(struct inode *, int); 2110 extern int ext4_change_inode_journal_flag(struct inode *, int); 2111 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2112 extern int ext4_inode_attach_jinode(struct inode *inode); 2113 extern int ext4_can_truncate(struct inode *inode); 2114 extern void ext4_truncate(struct inode *); 2115 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2116 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 2117 extern void ext4_set_inode_flags(struct inode *); 2118 extern void ext4_get_inode_flags(struct ext4_inode_info *); 2119 extern int ext4_alloc_da_blocks(struct inode *inode); 2120 extern void ext4_set_aops(struct inode *inode); 2121 extern int ext4_writepage_trans_blocks(struct inode *); 2122 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2123 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2124 loff_t lstart, loff_t lend); 2125 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 2126 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2127 extern void ext4_da_update_reserve_space(struct inode *inode, 2128 int used, int quota_claim); 2129 2130 /* indirect.c */ 2131 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2132 struct ext4_map_blocks *map, int flags); 2133 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb, 2134 struct iov_iter *iter, loff_t offset); 2135 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2136 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2137 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2138 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2139 ext4_lblk_t start, ext4_lblk_t end); 2140 2141 /* ioctl.c */ 2142 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2143 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2144 2145 /* migrate.c */ 2146 extern int ext4_ext_migrate(struct inode *); 2147 extern int ext4_ind_migrate(struct inode *inode); 2148 2149 /* namei.c */ 2150 extern int ext4_dirent_csum_verify(struct inode *inode, 2151 struct ext4_dir_entry *dirent); 2152 extern int ext4_orphan_add(handle_t *, struct inode *); 2153 extern int ext4_orphan_del(handle_t *, struct inode *); 2154 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2155 __u32 start_minor_hash, __u32 *next_hash); 2156 extern int search_dir(struct buffer_head *bh, 2157 char *search_buf, 2158 int buf_size, 2159 struct inode *dir, 2160 const struct qstr *d_name, 2161 unsigned int offset, 2162 struct ext4_dir_entry_2 **res_dir); 2163 extern int ext4_generic_delete_entry(handle_t *handle, 2164 struct inode *dir, 2165 struct ext4_dir_entry_2 *de_del, 2166 struct buffer_head *bh, 2167 void *entry_buf, 2168 int buf_size, 2169 int csum_size); 2170 2171 /* resize.c */ 2172 extern int ext4_group_add(struct super_block *sb, 2173 struct ext4_new_group_data *input); 2174 extern int ext4_group_extend(struct super_block *sb, 2175 struct ext4_super_block *es, 2176 ext4_fsblk_t n_blocks_count); 2177 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2178 2179 /* super.c */ 2180 extern int ext4_calculate_overhead(struct super_block *sb); 2181 extern void ext4_superblock_csum_set(struct super_block *sb); 2182 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 2183 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 2184 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2185 ext4_group_t ngroup); 2186 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2187 char nbuf[16]); 2188 2189 extern __printf(4, 5) 2190 void __ext4_error(struct super_block *, const char *, unsigned int, 2191 const char *, ...); 2192 extern __printf(5, 6) 2193 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2194 const char *, ...); 2195 extern __printf(5, 6) 2196 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2197 const char *, ...); 2198 extern void __ext4_std_error(struct super_block *, const char *, 2199 unsigned int, int); 2200 extern __printf(4, 5) 2201 void __ext4_abort(struct super_block *, const char *, unsigned int, 2202 const char *, ...); 2203 extern __printf(4, 5) 2204 void __ext4_warning(struct super_block *, const char *, unsigned int, 2205 const char *, ...); 2206 extern __printf(3, 4) 2207 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2208 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2209 const char *, unsigned int, const char *); 2210 extern __printf(7, 8) 2211 void __ext4_grp_locked_error(const char *, unsigned int, 2212 struct super_block *, ext4_group_t, 2213 unsigned long, ext4_fsblk_t, 2214 const char *, ...); 2215 2216 #ifdef CONFIG_PRINTK 2217 2218 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2219 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__) 2220 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2221 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2222 #define ext4_error(sb, fmt, ...) \ 2223 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2224 #define ext4_abort(sb, fmt, ...) \ 2225 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2226 #define ext4_warning(sb, fmt, ...) \ 2227 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2228 #define ext4_msg(sb, level, fmt, ...) \ 2229 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 2230 #define dump_mmp_msg(sb, mmp, msg) \ 2231 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 2232 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2233 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 2234 fmt, ##__VA_ARGS__) 2235 2236 #else 2237 2238 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2239 do { \ 2240 no_printk(fmt, ##__VA_ARGS__); \ 2241 __ext4_error_inode(inode, "", 0, block, " "); \ 2242 } while (0) 2243 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2244 do { \ 2245 no_printk(fmt, ##__VA_ARGS__); \ 2246 __ext4_error_file(file, "", 0, block, " "); \ 2247 } while (0) 2248 #define ext4_error(sb, fmt, ...) \ 2249 do { \ 2250 no_printk(fmt, ##__VA_ARGS__); \ 2251 __ext4_error(sb, "", 0, " "); \ 2252 } while (0) 2253 #define ext4_abort(sb, fmt, ...) \ 2254 do { \ 2255 no_printk(fmt, ##__VA_ARGS__); \ 2256 __ext4_abort(sb, "", 0, " "); \ 2257 } while (0) 2258 #define ext4_warning(sb, fmt, ...) \ 2259 do { \ 2260 no_printk(fmt, ##__VA_ARGS__); \ 2261 __ext4_warning(sb, "", 0, " "); \ 2262 } while (0) 2263 #define ext4_msg(sb, level, fmt, ...) \ 2264 do { \ 2265 no_printk(fmt, ##__VA_ARGS__); \ 2266 __ext4_msg(sb, "", " "); \ 2267 } while (0) 2268 #define dump_mmp_msg(sb, mmp, msg) \ 2269 __dump_mmp_msg(sb, mmp, "", 0, "") 2270 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2271 do { \ 2272 no_printk(fmt, ##__VA_ARGS__); \ 2273 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 2274 } while (0) 2275 2276 #endif 2277 2278 extern void ext4_update_dynamic_rev(struct super_block *sb); 2279 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2280 __u32 compat); 2281 extern int ext4_update_rocompat_feature(handle_t *handle, 2282 struct super_block *sb, __u32 rocompat); 2283 extern int ext4_update_incompat_feature(handle_t *handle, 2284 struct super_block *sb, __u32 incompat); 2285 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2286 struct ext4_group_desc *bg); 2287 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2288 struct ext4_group_desc *bg); 2289 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2290 struct ext4_group_desc *bg); 2291 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2292 struct ext4_group_desc *bg); 2293 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2294 struct ext4_group_desc *bg); 2295 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2296 struct ext4_group_desc *bg); 2297 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2298 struct ext4_group_desc *bg); 2299 extern void ext4_block_bitmap_set(struct super_block *sb, 2300 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2301 extern void ext4_inode_bitmap_set(struct super_block *sb, 2302 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2303 extern void ext4_inode_table_set(struct super_block *sb, 2304 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2305 extern void ext4_free_group_clusters_set(struct super_block *sb, 2306 struct ext4_group_desc *bg, 2307 __u32 count); 2308 extern void ext4_free_inodes_set(struct super_block *sb, 2309 struct ext4_group_desc *bg, __u32 count); 2310 extern void ext4_used_dirs_set(struct super_block *sb, 2311 struct ext4_group_desc *bg, __u32 count); 2312 extern void ext4_itable_unused_set(struct super_block *sb, 2313 struct ext4_group_desc *bg, __u32 count); 2314 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2315 struct ext4_group_desc *gdp); 2316 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2317 struct ext4_group_desc *gdp); 2318 extern int ext4_register_li_request(struct super_block *sb, 2319 ext4_group_t first_not_zeroed); 2320 2321 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2322 { 2323 return EXT4_HAS_RO_COMPAT_FEATURE(sb, 2324 EXT4_FEATURE_RO_COMPAT_GDT_CSUM) || 2325 (EXT4_SB(sb)->s_chksum_driver != NULL); 2326 } 2327 2328 static inline int ext4_has_metadata_csum(struct super_block *sb) 2329 { 2330 WARN_ON_ONCE(EXT4_HAS_RO_COMPAT_FEATURE(sb, 2331 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) && 2332 !EXT4_SB(sb)->s_chksum_driver); 2333 2334 return (EXT4_SB(sb)->s_chksum_driver != NULL); 2335 } 2336 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2337 { 2338 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2339 le32_to_cpu(es->s_blocks_count_lo); 2340 } 2341 2342 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2343 { 2344 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2345 le32_to_cpu(es->s_r_blocks_count_lo); 2346 } 2347 2348 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2349 { 2350 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2351 le32_to_cpu(es->s_free_blocks_count_lo); 2352 } 2353 2354 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2355 ext4_fsblk_t blk) 2356 { 2357 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2358 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2359 } 2360 2361 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2362 ext4_fsblk_t blk) 2363 { 2364 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2365 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2366 } 2367 2368 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2369 ext4_fsblk_t blk) 2370 { 2371 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2372 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2373 } 2374 2375 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 2376 { 2377 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2378 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2379 le32_to_cpu(raw_inode->i_size_lo); 2380 else 2381 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2382 } 2383 2384 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2385 { 2386 raw_inode->i_size_lo = cpu_to_le32(i_size); 2387 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2388 } 2389 2390 static inline 2391 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2392 ext4_group_t group) 2393 { 2394 struct ext4_group_info ***grp_info; 2395 long indexv, indexh; 2396 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 2397 grp_info = EXT4_SB(sb)->s_group_info; 2398 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2399 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2400 return grp_info[indexv][indexh]; 2401 } 2402 2403 /* 2404 * Reading s_groups_count requires using smp_rmb() afterwards. See 2405 * the locking protocol documented in the comments of ext4_group_add() 2406 * in resize.c 2407 */ 2408 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2409 { 2410 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2411 2412 smp_rmb(); 2413 return ngroups; 2414 } 2415 2416 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2417 ext4_group_t block_group) 2418 { 2419 return block_group >> sbi->s_log_groups_per_flex; 2420 } 2421 2422 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2423 { 2424 return 1 << sbi->s_log_groups_per_flex; 2425 } 2426 2427 #define ext4_std_error(sb, errno) \ 2428 do { \ 2429 if ((errno)) \ 2430 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2431 } while (0) 2432 2433 #ifdef CONFIG_SMP 2434 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2435 * counters. So we need to make sure we have free clusters more 2436 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2437 */ 2438 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2439 #else 2440 #define EXT4_FREECLUSTERS_WATERMARK 0 2441 #endif 2442 2443 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 2444 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2445 { 2446 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 2447 !mutex_is_locked(&inode->i_mutex)); 2448 down_write(&EXT4_I(inode)->i_data_sem); 2449 if (newsize > EXT4_I(inode)->i_disksize) 2450 EXT4_I(inode)->i_disksize = newsize; 2451 up_write(&EXT4_I(inode)->i_data_sem); 2452 } 2453 2454 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 2455 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 2456 { 2457 int changed = 0; 2458 2459 if (newsize > inode->i_size) { 2460 i_size_write(inode, newsize); 2461 changed = 1; 2462 } 2463 if (newsize > EXT4_I(inode)->i_disksize) { 2464 ext4_update_i_disksize(inode, newsize); 2465 changed |= 2; 2466 } 2467 return changed; 2468 } 2469 2470 struct ext4_group_info { 2471 unsigned long bb_state; 2472 struct rb_root bb_free_root; 2473 ext4_grpblk_t bb_first_free; /* first free block */ 2474 ext4_grpblk_t bb_free; /* total free blocks */ 2475 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 2476 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 2477 struct list_head bb_prealloc_list; 2478 #ifdef DOUBLE_CHECK 2479 void *bb_bitmap; 2480 #endif 2481 struct rw_semaphore alloc_sem; 2482 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2483 * regions, index is order. 2484 * bb_counters[3] = 5 means 2485 * 5 free 8-block regions. */ 2486 }; 2487 2488 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 2489 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 2490 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 2491 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 2492 2493 #define EXT4_MB_GRP_NEED_INIT(grp) \ 2494 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 2495 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 2496 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2497 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 2498 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2499 2500 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 2501 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2502 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 2503 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2504 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 2505 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2506 2507 #define EXT4_MAX_CONTENTION 8 2508 #define EXT4_CONTENTION_THRESHOLD 2 2509 2510 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2511 ext4_group_t group) 2512 { 2513 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2514 } 2515 2516 /* 2517 * Returns true if the filesystem is busy enough that attempts to 2518 * access the block group locks has run into contention. 2519 */ 2520 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 2521 { 2522 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 2523 } 2524 2525 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 2526 { 2527 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 2528 if (spin_trylock(lock)) 2529 /* 2530 * We're able to grab the lock right away, so drop the 2531 * lock contention counter. 2532 */ 2533 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 2534 else { 2535 /* 2536 * The lock is busy, so bump the contention counter, 2537 * and then wait on the spin lock. 2538 */ 2539 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 2540 EXT4_MAX_CONTENTION); 2541 spin_lock(lock); 2542 } 2543 } 2544 2545 static inline void ext4_unlock_group(struct super_block *sb, 2546 ext4_group_t group) 2547 { 2548 spin_unlock(ext4_group_lock_ptr(sb, group)); 2549 } 2550 2551 /* 2552 * Block validity checking 2553 */ 2554 #define ext4_check_indirect_blockref(inode, bh) \ 2555 ext4_check_blockref(__func__, __LINE__, inode, \ 2556 (__le32 *)(bh)->b_data, \ 2557 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 2558 2559 #define ext4_ind_check_inode(inode) \ 2560 ext4_check_blockref(__func__, __LINE__, inode, \ 2561 EXT4_I(inode)->i_data, \ 2562 EXT4_NDIR_BLOCKS) 2563 2564 /* 2565 * Inodes and files operations 2566 */ 2567 2568 /* dir.c */ 2569 extern const struct file_operations ext4_dir_operations; 2570 2571 /* file.c */ 2572 extern const struct inode_operations ext4_file_inode_operations; 2573 extern const struct file_operations ext4_file_operations; 2574 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 2575 2576 /* inline.c */ 2577 extern int ext4_get_max_inline_size(struct inode *inode); 2578 extern int ext4_find_inline_data_nolock(struct inode *inode); 2579 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 2580 unsigned int len); 2581 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 2582 2583 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 2584 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 2585 struct inode *inode, 2586 loff_t pos, unsigned len, 2587 unsigned flags, 2588 struct page **pagep); 2589 extern int ext4_write_inline_data_end(struct inode *inode, 2590 loff_t pos, unsigned len, 2591 unsigned copied, 2592 struct page *page); 2593 extern struct buffer_head * 2594 ext4_journalled_write_inline_data(struct inode *inode, 2595 unsigned len, 2596 struct page *page); 2597 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 2598 struct inode *inode, 2599 loff_t pos, unsigned len, 2600 unsigned flags, 2601 struct page **pagep, 2602 void **fsdata); 2603 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 2604 unsigned len, unsigned copied, 2605 struct page *page); 2606 extern int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry, 2607 struct inode *inode); 2608 extern int ext4_try_create_inline_dir(handle_t *handle, 2609 struct inode *parent, 2610 struct inode *inode); 2611 extern int ext4_read_inline_dir(struct file *filp, 2612 struct dir_context *ctx, 2613 int *has_inline_data); 2614 extern int htree_inlinedir_to_tree(struct file *dir_file, 2615 struct inode *dir, ext4_lblk_t block, 2616 struct dx_hash_info *hinfo, 2617 __u32 start_hash, __u32 start_minor_hash, 2618 int *has_inline_data); 2619 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 2620 const struct qstr *d_name, 2621 struct ext4_dir_entry_2 **res_dir, 2622 int *has_inline_data); 2623 extern int ext4_delete_inline_entry(handle_t *handle, 2624 struct inode *dir, 2625 struct ext4_dir_entry_2 *de_del, 2626 struct buffer_head *bh, 2627 int *has_inline_data); 2628 extern int empty_inline_dir(struct inode *dir, int *has_inline_data); 2629 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 2630 struct ext4_dir_entry_2 **parent_de, 2631 int *retval); 2632 extern int ext4_inline_data_fiemap(struct inode *inode, 2633 struct fiemap_extent_info *fieinfo, 2634 int *has_inline); 2635 extern int ext4_try_to_evict_inline_data(handle_t *handle, 2636 struct inode *inode, 2637 int needed); 2638 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline); 2639 2640 extern int ext4_convert_inline_data(struct inode *inode); 2641 2642 static inline int ext4_has_inline_data(struct inode *inode) 2643 { 2644 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 2645 EXT4_I(inode)->i_inline_off; 2646 } 2647 2648 /* namei.c */ 2649 extern const struct inode_operations ext4_dir_inode_operations; 2650 extern const struct inode_operations ext4_special_inode_operations; 2651 extern struct dentry *ext4_get_parent(struct dentry *child); 2652 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 2653 struct ext4_dir_entry_2 *de, 2654 int blocksize, int csum_size, 2655 unsigned int parent_ino, int dotdot_real_len); 2656 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t, 2657 unsigned int blocksize); 2658 extern int ext4_handle_dirty_dirent_node(handle_t *handle, 2659 struct inode *inode, 2660 struct buffer_head *bh); 2661 #define S_SHIFT 12 2662 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = { 2663 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 2664 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 2665 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 2666 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 2667 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 2668 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 2669 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 2670 }; 2671 2672 static inline void ext4_set_de_type(struct super_block *sb, 2673 struct ext4_dir_entry_2 *de, 2674 umode_t mode) { 2675 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE)) 2676 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 2677 } 2678 2679 2680 /* symlink.c */ 2681 extern const struct inode_operations ext4_symlink_inode_operations; 2682 extern const struct inode_operations ext4_fast_symlink_inode_operations; 2683 2684 /* block_validity */ 2685 extern void ext4_release_system_zone(struct super_block *sb); 2686 extern int ext4_setup_system_zone(struct super_block *sb); 2687 extern int __init ext4_init_system_zone(void); 2688 extern void ext4_exit_system_zone(void); 2689 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 2690 ext4_fsblk_t start_blk, 2691 unsigned int count); 2692 extern int ext4_check_blockref(const char *, unsigned int, 2693 struct inode *, __le32 *, unsigned int); 2694 2695 /* extents.c */ 2696 struct ext4_ext_path; 2697 struct ext4_extent; 2698 2699 /* 2700 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 2701 * __le32. 2702 */ 2703 #define EXT_MAX_BLOCKS 0xffffffff 2704 2705 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 2706 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 2707 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 2708 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 2709 struct ext4_map_blocks *map, int flags); 2710 extern void ext4_ext_truncate(handle_t *, struct inode *); 2711 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 2712 ext4_lblk_t end); 2713 extern void ext4_ext_init(struct super_block *); 2714 extern void ext4_ext_release(struct super_block *); 2715 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 2716 loff_t len); 2717 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 2718 loff_t offset, ssize_t len); 2719 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 2720 struct ext4_map_blocks *map, int flags); 2721 extern int ext4_ext_calc_metadata_amount(struct inode *inode, 2722 ext4_lblk_t lblocks); 2723 extern int ext4_extent_tree_init(handle_t *, struct inode *); 2724 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 2725 int num, 2726 struct ext4_ext_path *path); 2727 extern int ext4_can_extents_be_merged(struct inode *inode, 2728 struct ext4_extent *ex1, 2729 struct ext4_extent *ex2); 2730 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 2731 struct ext4_ext_path **, 2732 struct ext4_extent *, int); 2733 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 2734 struct ext4_ext_path **, 2735 int flags); 2736 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 2737 extern int ext4_ext_check_inode(struct inode *inode); 2738 extern int ext4_find_delalloc_range(struct inode *inode, 2739 ext4_lblk_t lblk_start, 2740 ext4_lblk_t lblk_end); 2741 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk); 2742 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 2743 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2744 __u64 start, __u64 len); 2745 extern int ext4_ext_precache(struct inode *inode); 2746 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len); 2747 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 2748 struct inode *inode2, ext4_lblk_t lblk1, 2749 ext4_lblk_t lblk2, ext4_lblk_t count, 2750 int mark_unwritten,int *err); 2751 2752 /* move_extent.c */ 2753 extern void ext4_double_down_write_data_sem(struct inode *first, 2754 struct inode *second); 2755 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 2756 struct inode *donor_inode); 2757 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 2758 __u64 start_orig, __u64 start_donor, 2759 __u64 len, __u64 *moved_len); 2760 2761 /* page-io.c */ 2762 extern int __init ext4_init_pageio(void); 2763 extern void ext4_exit_pageio(void); 2764 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 2765 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 2766 extern int ext4_put_io_end(ext4_io_end_t *io_end); 2767 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 2768 extern void ext4_io_submit_init(struct ext4_io_submit *io, 2769 struct writeback_control *wbc); 2770 extern void ext4_end_io_rsv_work(struct work_struct *work); 2771 extern void ext4_io_submit(struct ext4_io_submit *io); 2772 extern int ext4_bio_write_page(struct ext4_io_submit *io, 2773 struct page *page, 2774 int len, 2775 struct writeback_control *wbc, 2776 bool keep_towrite); 2777 2778 /* mmp.c */ 2779 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 2780 2781 /* 2782 * Add new method to test whether block and inode bitmaps are properly 2783 * initialized. With uninit_bg reading the block from disk is not enough 2784 * to mark the bitmap uptodate. We need to also zero-out the bitmap 2785 */ 2786 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 2787 2788 static inline int bitmap_uptodate(struct buffer_head *bh) 2789 { 2790 return (buffer_uptodate(bh) && 2791 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 2792 } 2793 static inline void set_bitmap_uptodate(struct buffer_head *bh) 2794 { 2795 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 2796 } 2797 2798 /* 2799 * Disable DIO read nolock optimization, so new dioreaders will be forced 2800 * to grab i_mutex 2801 */ 2802 static inline void ext4_inode_block_unlocked_dio(struct inode *inode) 2803 { 2804 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 2805 smp_mb(); 2806 } 2807 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode) 2808 { 2809 smp_mb(); 2810 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 2811 } 2812 2813 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 2814 2815 /* For ioend & aio unwritten conversion wait queues */ 2816 #define EXT4_WQ_HASH_SZ 37 2817 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 2818 EXT4_WQ_HASH_SZ]) 2819 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\ 2820 EXT4_WQ_HASH_SZ]) 2821 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 2822 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; 2823 2824 #define EXT4_RESIZING 0 2825 extern int ext4_resize_begin(struct super_block *sb); 2826 extern void ext4_resize_end(struct super_block *sb); 2827 2828 #endif /* __KERNEL__ */ 2829 2830 #endif /* _EXT4_H */ 2831