1 /* 2 * ext4.h 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/include/linux/minix_fs.h 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 */ 15 16 #ifndef _EXT4_H 17 #define _EXT4_H 18 19 #include <linux/types.h> 20 #include <linux/blkdev.h> 21 #include <linux/magic.h> 22 #include <linux/jbd2.h> 23 #include <linux/quota.h> 24 #include <linux/rwsem.h> 25 #include <linux/rbtree.h> 26 #include <linux/seqlock.h> 27 #include <linux/mutex.h> 28 #include <linux/timer.h> 29 #include <linux/wait.h> 30 #include <linux/blockgroup_lock.h> 31 #include <linux/percpu_counter.h> 32 #include <crypto/hash.h> 33 #ifdef __KERNEL__ 34 #include <linux/compat.h> 35 #endif 36 37 /* 38 * The fourth extended filesystem constants/structures 39 */ 40 41 /* 42 * Define EXT4FS_DEBUG to produce debug messages 43 */ 44 #undef EXT4FS_DEBUG 45 46 /* 47 * Debug code 48 */ 49 #ifdef EXT4FS_DEBUG 50 #define ext4_debug(f, a...) \ 51 do { \ 52 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 53 __FILE__, __LINE__, __func__); \ 54 printk(KERN_DEBUG f, ## a); \ 55 } while (0) 56 #else 57 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 58 #endif 59 60 /* 61 * Turn on EXT_DEBUG to get lots of info about extents operations. 62 */ 63 #define EXT_DEBUG__ 64 #ifdef EXT_DEBUG 65 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__) 66 #else 67 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 68 #endif 69 70 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 71 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 72 73 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 74 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 75 76 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 77 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 78 79 /* data type for block offset of block group */ 80 typedef int ext4_grpblk_t; 81 82 /* data type for filesystem-wide blocks number */ 83 typedef unsigned long long ext4_fsblk_t; 84 85 /* data type for file logical block number */ 86 typedef __u32 ext4_lblk_t; 87 88 /* data type for block group number */ 89 typedef unsigned int ext4_group_t; 90 91 /* 92 * Flags used in mballoc's allocation_context flags field. 93 * 94 * Also used to show what's going on for debugging purposes when the 95 * flag field is exported via the traceport interface 96 */ 97 98 /* prefer goal again. length */ 99 #define EXT4_MB_HINT_MERGE 0x0001 100 /* blocks already reserved */ 101 #define EXT4_MB_HINT_RESERVED 0x0002 102 /* metadata is being allocated */ 103 #define EXT4_MB_HINT_METADATA 0x0004 104 /* first blocks in the file */ 105 #define EXT4_MB_HINT_FIRST 0x0008 106 /* search for the best chunk */ 107 #define EXT4_MB_HINT_BEST 0x0010 108 /* data is being allocated */ 109 #define EXT4_MB_HINT_DATA 0x0020 110 /* don't preallocate (for tails) */ 111 #define EXT4_MB_HINT_NOPREALLOC 0x0040 112 /* allocate for locality group */ 113 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 114 /* allocate goal blocks or none */ 115 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 116 /* goal is meaningful */ 117 #define EXT4_MB_HINT_TRY_GOAL 0x0200 118 /* blocks already pre-reserved by delayed allocation */ 119 #define EXT4_MB_DELALLOC_RESERVED 0x0400 120 /* We are doing stream allocation */ 121 #define EXT4_MB_STREAM_ALLOC 0x0800 122 /* Use reserved root blocks if needed */ 123 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 124 /* Use blocks from reserved pool */ 125 #define EXT4_MB_USE_RESERVED 0x2000 126 127 struct ext4_allocation_request { 128 /* target inode for block we're allocating */ 129 struct inode *inode; 130 /* how many blocks we want to allocate */ 131 unsigned int len; 132 /* logical block in target inode */ 133 ext4_lblk_t logical; 134 /* the closest logical allocated block to the left */ 135 ext4_lblk_t lleft; 136 /* the closest logical allocated block to the right */ 137 ext4_lblk_t lright; 138 /* phys. target (a hint) */ 139 ext4_fsblk_t goal; 140 /* phys. block for the closest logical allocated block to the left */ 141 ext4_fsblk_t pleft; 142 /* phys. block for the closest logical allocated block to the right */ 143 ext4_fsblk_t pright; 144 /* flags. see above EXT4_MB_HINT_* */ 145 unsigned int flags; 146 }; 147 148 /* 149 * Logical to physical block mapping, used by ext4_map_blocks() 150 * 151 * This structure is used to pass requests into ext4_map_blocks() as 152 * well as to store the information returned by ext4_map_blocks(). It 153 * takes less room on the stack than a struct buffer_head. 154 */ 155 #define EXT4_MAP_NEW (1 << BH_New) 156 #define EXT4_MAP_MAPPED (1 << BH_Mapped) 157 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 158 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 159 #define EXT4_MAP_UNINIT (1 << BH_Uninit) 160 /* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of 161 * ext4_map_blocks wants to know whether or not the underlying cluster has 162 * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that 163 * the requested mapping was from previously mapped (or delayed allocated) 164 * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster 165 * should never appear on buffer_head's state flags. 166 */ 167 #define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster) 168 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 169 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\ 170 EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER) 171 172 struct ext4_map_blocks { 173 ext4_fsblk_t m_pblk; 174 ext4_lblk_t m_lblk; 175 unsigned int m_len; 176 unsigned int m_flags; 177 }; 178 179 /* 180 * Flags for ext4_io_end->flags 181 */ 182 #define EXT4_IO_END_UNWRITTEN 0x0001 183 184 /* 185 * For converting uninitialized extents on a work queue. 'handle' is used for 186 * buffered writeback. 187 */ 188 typedef struct ext4_io_end { 189 struct list_head list; /* per-file finished IO list */ 190 handle_t *handle; /* handle reserved for extent 191 * conversion */ 192 struct inode *inode; /* file being written to */ 193 struct bio *bio; /* Linked list of completed 194 * bios covering the extent */ 195 unsigned int flag; /* unwritten or not */ 196 loff_t offset; /* offset in the file */ 197 ssize_t size; /* size of the extent */ 198 atomic_t count; /* reference counter */ 199 } ext4_io_end_t; 200 201 struct ext4_io_submit { 202 int io_op; 203 struct bio *io_bio; 204 ext4_io_end_t *io_end; 205 sector_t io_next_block; 206 }; 207 208 /* 209 * Special inodes numbers 210 */ 211 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 212 #define EXT4_ROOT_INO 2 /* Root inode */ 213 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 214 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 215 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 216 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 217 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 218 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 219 220 /* First non-reserved inode for old ext4 filesystems */ 221 #define EXT4_GOOD_OLD_FIRST_INO 11 222 223 /* 224 * Maximal count of links to a file 225 */ 226 #define EXT4_LINK_MAX 65000 227 228 /* 229 * Macro-instructions used to manage several block sizes 230 */ 231 #define EXT4_MIN_BLOCK_SIZE 1024 232 #define EXT4_MAX_BLOCK_SIZE 65536 233 #define EXT4_MIN_BLOCK_LOG_SIZE 10 234 #define EXT4_MAX_BLOCK_LOG_SIZE 16 235 #ifdef __KERNEL__ 236 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 237 #else 238 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 239 #endif 240 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 241 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 242 EXT4_SB(s)->s_cluster_bits) 243 #ifdef __KERNEL__ 244 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 245 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 246 #else 247 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 248 #endif 249 #ifdef __KERNEL__ 250 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 251 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 252 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 253 #else 254 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 255 EXT4_GOOD_OLD_INODE_SIZE : \ 256 (s)->s_inode_size) 257 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 258 EXT4_GOOD_OLD_FIRST_INO : \ 259 (s)->s_first_ino) 260 #endif 261 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 262 263 /* Translate a block number to a cluster number */ 264 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 265 /* Translate a cluster number to a block number */ 266 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 267 /* Translate # of blks to # of clusters */ 268 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 269 (sbi)->s_cluster_bits) 270 271 /* 272 * Structure of a blocks group descriptor 273 */ 274 struct ext4_group_desc 275 { 276 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 277 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 278 __le32 bg_inode_table_lo; /* Inodes table block */ 279 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 280 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 281 __le16 bg_used_dirs_count_lo; /* Directories count */ 282 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 283 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 284 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 285 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 286 __le16 bg_itable_unused_lo; /* Unused inodes count */ 287 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 288 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 289 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 290 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 291 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 292 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 293 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 294 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 295 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 296 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 297 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 298 __u32 bg_reserved; 299 }; 300 301 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 302 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 303 sizeof(__le16)) 304 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 305 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 306 sizeof(__le16)) 307 308 /* 309 * Structure of a flex block group info 310 */ 311 312 struct flex_groups { 313 atomic64_t free_clusters; 314 atomic_t free_inodes; 315 atomic_t used_dirs; 316 }; 317 318 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 319 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 320 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 321 322 /* 323 * Macro-instructions used to manage group descriptors 324 */ 325 #define EXT4_MIN_DESC_SIZE 32 326 #define EXT4_MIN_DESC_SIZE_64BIT 64 327 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 328 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 329 #ifdef __KERNEL__ 330 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 331 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 332 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 333 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 334 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 335 #else 336 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 337 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 338 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 339 #endif 340 341 /* 342 * Constants relative to the data blocks 343 */ 344 #define EXT4_NDIR_BLOCKS 12 345 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 346 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 347 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 348 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 349 350 /* 351 * Inode flags 352 */ 353 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 354 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 355 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 356 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 357 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 358 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 359 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 360 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 361 /* Reserved for compression usage... */ 362 #define EXT4_DIRTY_FL 0x00000100 363 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 364 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 365 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 366 /* End compression flags --- maybe not all used */ 367 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 368 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 369 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 370 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 371 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 372 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 373 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 374 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 375 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 376 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 377 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 378 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 379 380 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 381 #define EXT4_FL_USER_MODIFIABLE 0x004380FF /* User modifiable flags */ 382 383 /* Flags that should be inherited by new inodes from their parent. */ 384 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 385 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 386 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 387 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 388 389 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 390 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 391 392 /* Flags that are appropriate for non-directories/regular files. */ 393 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 394 395 /* Mask out flags that are inappropriate for the given type of inode. */ 396 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 397 { 398 if (S_ISDIR(mode)) 399 return flags; 400 else if (S_ISREG(mode)) 401 return flags & EXT4_REG_FLMASK; 402 else 403 return flags & EXT4_OTHER_FLMASK; 404 } 405 406 /* 407 * Inode flags used for atomic set/get 408 */ 409 enum { 410 EXT4_INODE_SECRM = 0, /* Secure deletion */ 411 EXT4_INODE_UNRM = 1, /* Undelete */ 412 EXT4_INODE_COMPR = 2, /* Compress file */ 413 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 414 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 415 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 416 EXT4_INODE_NODUMP = 6, /* do not dump file */ 417 EXT4_INODE_NOATIME = 7, /* do not update atime */ 418 /* Reserved for compression usage... */ 419 EXT4_INODE_DIRTY = 8, 420 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 421 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 422 EXT4_INODE_ECOMPR = 11, /* Compression error */ 423 /* End compression flags --- maybe not all used */ 424 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 425 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 426 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 427 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 428 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 429 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 430 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 431 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 432 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 433 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 434 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 435 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 436 }; 437 438 /* 439 * Since it's pretty easy to mix up bit numbers and hex values, we use a 440 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 441 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 442 * any extra space in the compiled kernel image, otherwise, the build will fail. 443 * It's important that these values are the same, since we are using 444 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 445 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 446 * values found in ext2, ext3 and ext4 filesystems, and of course the values 447 * defined in e2fsprogs. 448 * 449 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 450 */ 451 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 452 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 453 454 static inline void ext4_check_flag_values(void) 455 { 456 CHECK_FLAG_VALUE(SECRM); 457 CHECK_FLAG_VALUE(UNRM); 458 CHECK_FLAG_VALUE(COMPR); 459 CHECK_FLAG_VALUE(SYNC); 460 CHECK_FLAG_VALUE(IMMUTABLE); 461 CHECK_FLAG_VALUE(APPEND); 462 CHECK_FLAG_VALUE(NODUMP); 463 CHECK_FLAG_VALUE(NOATIME); 464 CHECK_FLAG_VALUE(DIRTY); 465 CHECK_FLAG_VALUE(COMPRBLK); 466 CHECK_FLAG_VALUE(NOCOMPR); 467 CHECK_FLAG_VALUE(ECOMPR); 468 CHECK_FLAG_VALUE(INDEX); 469 CHECK_FLAG_VALUE(IMAGIC); 470 CHECK_FLAG_VALUE(JOURNAL_DATA); 471 CHECK_FLAG_VALUE(NOTAIL); 472 CHECK_FLAG_VALUE(DIRSYNC); 473 CHECK_FLAG_VALUE(TOPDIR); 474 CHECK_FLAG_VALUE(HUGE_FILE); 475 CHECK_FLAG_VALUE(EXTENTS); 476 CHECK_FLAG_VALUE(EA_INODE); 477 CHECK_FLAG_VALUE(EOFBLOCKS); 478 CHECK_FLAG_VALUE(INLINE_DATA); 479 CHECK_FLAG_VALUE(RESERVED); 480 } 481 482 /* Used to pass group descriptor data when online resize is done */ 483 struct ext4_new_group_input { 484 __u32 group; /* Group number for this data */ 485 __u64 block_bitmap; /* Absolute block number of block bitmap */ 486 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 487 __u64 inode_table; /* Absolute block number of inode table start */ 488 __u32 blocks_count; /* Total number of blocks in this group */ 489 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 490 __u16 unused; 491 }; 492 493 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 494 struct compat_ext4_new_group_input { 495 u32 group; 496 compat_u64 block_bitmap; 497 compat_u64 inode_bitmap; 498 compat_u64 inode_table; 499 u32 blocks_count; 500 u16 reserved_blocks; 501 u16 unused; 502 }; 503 #endif 504 505 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 506 struct ext4_new_group_data { 507 __u32 group; 508 __u64 block_bitmap; 509 __u64 inode_bitmap; 510 __u64 inode_table; 511 __u32 blocks_count; 512 __u16 reserved_blocks; 513 __u16 unused; 514 __u32 free_blocks_count; 515 }; 516 517 /* Indexes used to index group tables in ext4_new_group_data */ 518 enum { 519 BLOCK_BITMAP = 0, /* block bitmap */ 520 INODE_BITMAP, /* inode bitmap */ 521 INODE_TABLE, /* inode tables */ 522 GROUP_TABLE_COUNT, 523 }; 524 525 /* 526 * Flags used by ext4_map_blocks() 527 */ 528 /* Allocate any needed blocks and/or convert an unitialized 529 extent to be an initialized ext4 */ 530 #define EXT4_GET_BLOCKS_CREATE 0x0001 531 /* Request the creation of an unitialized extent */ 532 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 533 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ 534 EXT4_GET_BLOCKS_CREATE) 535 /* Caller is from the delayed allocation writeout path 536 * finally doing the actual allocation of delayed blocks */ 537 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 538 /* caller is from the direct IO path, request to creation of an 539 unitialized extents if not allocated, split the uninitialized 540 extent if blocks has been preallocated already*/ 541 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 542 #define EXT4_GET_BLOCKS_CONVERT 0x0010 543 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 544 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 545 /* Convert extent to initialized after IO complete */ 546 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 547 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 548 /* Eventual metadata allocation (due to growing extent tree) 549 * should not fail, so try to use reserved blocks for that.*/ 550 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 551 /* Don't normalize allocation size (used for fallocate) */ 552 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 553 /* Request will not result in inode size update (user for fallocate) */ 554 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 555 /* Do not take i_data_sem locking in ext4_map_blocks */ 556 #define EXT4_GET_BLOCKS_NO_LOCK 0x0100 557 /* Do not put hole in extent cache */ 558 #define EXT4_GET_BLOCKS_NO_PUT_HOLE 0x0200 559 560 /* 561 * The bit position of these flags must not overlap with any of the 562 * EXT4_GET_BLOCKS_*. They are used by ext4_ext_find_extent(), 563 * read_extent_tree_block(), ext4_split_extent_at(), 564 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 565 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 566 * caching the extents when reading from the extent tree while a 567 * truncate or punch hole operation is in progress. 568 */ 569 #define EXT4_EX_NOCACHE 0x0400 570 #define EXT4_EX_FORCE_CACHE 0x0800 571 572 /* 573 * Flags used by ext4_free_blocks 574 */ 575 #define EXT4_FREE_BLOCKS_METADATA 0x0001 576 #define EXT4_FREE_BLOCKS_FORGET 0x0002 577 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 578 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 579 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 580 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 581 #define EXT4_FREE_BLOCKS_RESERVE 0x0040 582 583 /* 584 * ioctl commands 585 */ 586 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 587 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 588 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 589 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 590 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 591 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 592 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 593 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 594 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 595 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 596 #define EXT4_IOC_MIGRATE _IO('f', 9) 597 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 598 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 599 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 600 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 601 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 602 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 603 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 604 605 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 606 /* 607 * ioctl commands in 32 bit emulation 608 */ 609 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 610 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 611 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 612 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 613 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 614 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 615 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 616 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 617 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 618 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 619 #endif 620 621 /* Max physical block we can address w/o extents */ 622 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 623 624 /* 625 * Structure of an inode on the disk 626 */ 627 struct ext4_inode { 628 __le16 i_mode; /* File mode */ 629 __le16 i_uid; /* Low 16 bits of Owner Uid */ 630 __le32 i_size_lo; /* Size in bytes */ 631 __le32 i_atime; /* Access time */ 632 __le32 i_ctime; /* Inode Change time */ 633 __le32 i_mtime; /* Modification time */ 634 __le32 i_dtime; /* Deletion Time */ 635 __le16 i_gid; /* Low 16 bits of Group Id */ 636 __le16 i_links_count; /* Links count */ 637 __le32 i_blocks_lo; /* Blocks count */ 638 __le32 i_flags; /* File flags */ 639 union { 640 struct { 641 __le32 l_i_version; 642 } linux1; 643 struct { 644 __u32 h_i_translator; 645 } hurd1; 646 struct { 647 __u32 m_i_reserved1; 648 } masix1; 649 } osd1; /* OS dependent 1 */ 650 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 651 __le32 i_generation; /* File version (for NFS) */ 652 __le32 i_file_acl_lo; /* File ACL */ 653 __le32 i_size_high; 654 __le32 i_obso_faddr; /* Obsoleted fragment address */ 655 union { 656 struct { 657 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 658 __le16 l_i_file_acl_high; 659 __le16 l_i_uid_high; /* these 2 fields */ 660 __le16 l_i_gid_high; /* were reserved2[0] */ 661 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 662 __le16 l_i_reserved; 663 } linux2; 664 struct { 665 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 666 __u16 h_i_mode_high; 667 __u16 h_i_uid_high; 668 __u16 h_i_gid_high; 669 __u32 h_i_author; 670 } hurd2; 671 struct { 672 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 673 __le16 m_i_file_acl_high; 674 __u32 m_i_reserved2[2]; 675 } masix2; 676 } osd2; /* OS dependent 2 */ 677 __le16 i_extra_isize; 678 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 679 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 680 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 681 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 682 __le32 i_crtime; /* File Creation time */ 683 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 684 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 685 }; 686 687 struct move_extent { 688 __u32 reserved; /* should be zero */ 689 __u32 donor_fd; /* donor file descriptor */ 690 __u64 orig_start; /* logical start offset in block for orig */ 691 __u64 donor_start; /* logical start offset in block for donor */ 692 __u64 len; /* block length to be moved */ 693 __u64 moved_len; /* moved block length */ 694 }; 695 696 #define EXT4_EPOCH_BITS 2 697 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 698 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 699 700 /* 701 * Extended fields will fit into an inode if the filesystem was formatted 702 * with large inodes (-I 256 or larger) and there are not currently any EAs 703 * consuming all of the available space. For new inodes we always reserve 704 * enough space for the kernel's known extended fields, but for inodes 705 * created with an old kernel this might not have been the case. None of 706 * the extended inode fields is critical for correct filesystem operation. 707 * This macro checks if a certain field fits in the inode. Note that 708 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 709 */ 710 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 711 ((offsetof(typeof(*ext4_inode), field) + \ 712 sizeof((ext4_inode)->field)) \ 713 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 714 (einode)->i_extra_isize)) \ 715 716 static inline __le32 ext4_encode_extra_time(struct timespec *time) 717 { 718 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 719 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | 720 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); 721 } 722 723 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 724 { 725 if (sizeof(time->tv_sec) > 4) 726 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 727 << 32; 728 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 729 } 730 731 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 732 do { \ 733 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 734 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 735 (raw_inode)->xtime ## _extra = \ 736 ext4_encode_extra_time(&(inode)->xtime); \ 737 } while (0) 738 739 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 740 do { \ 741 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 742 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 743 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 744 (raw_inode)->xtime ## _extra = \ 745 ext4_encode_extra_time(&(einode)->xtime); \ 746 } while (0) 747 748 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 749 do { \ 750 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 751 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 752 ext4_decode_extra_time(&(inode)->xtime, \ 753 raw_inode->xtime ## _extra); \ 754 else \ 755 (inode)->xtime.tv_nsec = 0; \ 756 } while (0) 757 758 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 759 do { \ 760 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 761 (einode)->xtime.tv_sec = \ 762 (signed)le32_to_cpu((raw_inode)->xtime); \ 763 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 764 ext4_decode_extra_time(&(einode)->xtime, \ 765 raw_inode->xtime ## _extra); \ 766 else \ 767 (einode)->xtime.tv_nsec = 0; \ 768 } while (0) 769 770 #define i_disk_version osd1.linux1.l_i_version 771 772 #if defined(__KERNEL__) || defined(__linux__) 773 #define i_reserved1 osd1.linux1.l_i_reserved1 774 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 775 #define i_blocks_high osd2.linux2.l_i_blocks_high 776 #define i_uid_low i_uid 777 #define i_gid_low i_gid 778 #define i_uid_high osd2.linux2.l_i_uid_high 779 #define i_gid_high osd2.linux2.l_i_gid_high 780 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 781 782 #elif defined(__GNU__) 783 784 #define i_translator osd1.hurd1.h_i_translator 785 #define i_uid_high osd2.hurd2.h_i_uid_high 786 #define i_gid_high osd2.hurd2.h_i_gid_high 787 #define i_author osd2.hurd2.h_i_author 788 789 #elif defined(__masix__) 790 791 #define i_reserved1 osd1.masix1.m_i_reserved1 792 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 793 #define i_reserved2 osd2.masix2.m_i_reserved2 794 795 #endif /* defined(__KERNEL__) || defined(__linux__) */ 796 797 #include "extents_status.h" 798 799 /* 800 * fourth extended file system inode data in memory 801 */ 802 struct ext4_inode_info { 803 __le32 i_data[15]; /* unconverted */ 804 __u32 i_dtime; 805 ext4_fsblk_t i_file_acl; 806 807 /* 808 * i_block_group is the number of the block group which contains 809 * this file's inode. Constant across the lifetime of the inode, 810 * it is ued for making block allocation decisions - we try to 811 * place a file's data blocks near its inode block, and new inodes 812 * near to their parent directory's inode. 813 */ 814 ext4_group_t i_block_group; 815 ext4_lblk_t i_dir_start_lookup; 816 #if (BITS_PER_LONG < 64) 817 unsigned long i_state_flags; /* Dynamic state flags */ 818 #endif 819 unsigned long i_flags; 820 821 /* 822 * Extended attributes can be read independently of the main file 823 * data. Taking i_mutex even when reading would cause contention 824 * between readers of EAs and writers of regular file data, so 825 * instead we synchronize on xattr_sem when reading or changing 826 * EAs. 827 */ 828 struct rw_semaphore xattr_sem; 829 830 struct list_head i_orphan; /* unlinked but open inodes */ 831 832 /* 833 * i_disksize keeps track of what the inode size is ON DISK, not 834 * in memory. During truncate, i_size is set to the new size by 835 * the VFS prior to calling ext4_truncate(), but the filesystem won't 836 * set i_disksize to 0 until the truncate is actually under way. 837 * 838 * The intent is that i_disksize always represents the blocks which 839 * are used by this file. This allows recovery to restart truncate 840 * on orphans if we crash during truncate. We actually write i_disksize 841 * into the on-disk inode when writing inodes out, instead of i_size. 842 * 843 * The only time when i_disksize and i_size may be different is when 844 * a truncate is in progress. The only things which change i_disksize 845 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 846 */ 847 loff_t i_disksize; 848 849 /* 850 * i_data_sem is for serialising ext4_truncate() against 851 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 852 * data tree are chopped off during truncate. We can't do that in 853 * ext4 because whenever we perform intermediate commits during 854 * truncate, the inode and all the metadata blocks *must* be in a 855 * consistent state which allows truncation of the orphans to restart 856 * during recovery. Hence we must fix the get_block-vs-truncate race 857 * by other means, so we have i_data_sem. 858 */ 859 struct rw_semaphore i_data_sem; 860 struct inode vfs_inode; 861 struct jbd2_inode *jinode; 862 863 /* 864 * File creation time. Its function is same as that of 865 * struct timespec i_{a,c,m}time in the generic inode. 866 */ 867 struct timespec i_crtime; 868 869 /* mballoc */ 870 struct list_head i_prealloc_list; 871 spinlock_t i_prealloc_lock; 872 873 /* extents status tree */ 874 struct ext4_es_tree i_es_tree; 875 rwlock_t i_es_lock; 876 struct list_head i_es_lru; 877 unsigned int i_es_lru_nr; /* protected by i_es_lock */ 878 unsigned long i_touch_when; /* jiffies of last accessing */ 879 880 /* ialloc */ 881 ext4_group_t i_last_alloc_group; 882 883 /* allocation reservation info for delalloc */ 884 /* In case of bigalloc, these refer to clusters rather than blocks */ 885 unsigned int i_reserved_data_blocks; 886 unsigned int i_reserved_meta_blocks; 887 unsigned int i_allocated_meta_blocks; 888 ext4_lblk_t i_da_metadata_calc_last_lblock; 889 int i_da_metadata_calc_len; 890 891 /* on-disk additional length */ 892 __u16 i_extra_isize; 893 894 /* Indicate the inline data space. */ 895 u16 i_inline_off; 896 u16 i_inline_size; 897 898 #ifdef CONFIG_QUOTA 899 /* quota space reservation, managed internally by quota code */ 900 qsize_t i_reserved_quota; 901 #endif 902 903 /* Lock protecting lists below */ 904 spinlock_t i_completed_io_lock; 905 /* 906 * Completed IOs that need unwritten extents handling and have 907 * transaction reserved 908 */ 909 struct list_head i_rsv_conversion_list; 910 /* 911 * Completed IOs that need unwritten extents handling and don't have 912 * transaction reserved 913 */ 914 atomic_t i_ioend_count; /* Number of outstanding io_end structs */ 915 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 916 struct work_struct i_rsv_conversion_work; 917 918 spinlock_t i_block_reservation_lock; 919 920 /* 921 * Transactions that contain inode's metadata needed to complete 922 * fsync and fdatasync, respectively. 923 */ 924 tid_t i_sync_tid; 925 tid_t i_datasync_tid; 926 927 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 928 __u32 i_csum_seed; 929 }; 930 931 /* 932 * File system states 933 */ 934 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 935 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 936 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 937 938 /* 939 * Misc. filesystem flags 940 */ 941 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 942 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 943 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 944 945 /* 946 * Mount flags set via mount options or defaults 947 */ 948 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 949 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 950 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 951 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 952 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 953 #define EXT4_MOUNT_ERRORS_MASK 0x00070 954 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 955 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 956 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 957 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 958 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 959 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 960 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 961 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 962 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 963 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 964 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 965 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 966 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 967 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 968 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 969 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 970 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 971 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 972 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 973 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 974 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 975 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 976 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 977 978 /* 979 * Mount flags set either automatically (could not be set by mount option) 980 * based on per file system feature or property or in special cases such as 981 * distinguishing between explicit mount option definition and default. 982 */ 983 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 984 specified delalloc */ 985 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 986 size of blocksize * 8 987 blocks */ 988 989 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 990 ~EXT4_MOUNT_##opt 991 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 992 EXT4_MOUNT_##opt 993 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 994 EXT4_MOUNT_##opt) 995 996 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 997 ~EXT4_MOUNT2_##opt 998 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 999 EXT4_MOUNT2_##opt 1000 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1001 EXT4_MOUNT2_##opt) 1002 1003 #define ext4_test_and_set_bit __test_and_set_bit_le 1004 #define ext4_set_bit __set_bit_le 1005 #define ext4_set_bit_atomic ext2_set_bit_atomic 1006 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1007 #define ext4_clear_bit __clear_bit_le 1008 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1009 #define ext4_test_bit test_bit_le 1010 #define ext4_find_next_zero_bit find_next_zero_bit_le 1011 #define ext4_find_next_bit find_next_bit_le 1012 1013 extern void ext4_set_bits(void *bm, int cur, int len); 1014 1015 /* 1016 * Maximal mount counts between two filesystem checks 1017 */ 1018 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1019 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1020 1021 /* 1022 * Behaviour when detecting errors 1023 */ 1024 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1025 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1026 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1027 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1028 1029 /* Metadata checksum algorithm codes */ 1030 #define EXT4_CRC32C_CHKSUM 1 1031 1032 /* 1033 * Structure of the super block 1034 */ 1035 struct ext4_super_block { 1036 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1037 __le32 s_blocks_count_lo; /* Blocks count */ 1038 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1039 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1040 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1041 __le32 s_first_data_block; /* First Data Block */ 1042 __le32 s_log_block_size; /* Block size */ 1043 __le32 s_log_cluster_size; /* Allocation cluster size */ 1044 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1045 __le32 s_clusters_per_group; /* # Clusters per group */ 1046 __le32 s_inodes_per_group; /* # Inodes per group */ 1047 __le32 s_mtime; /* Mount time */ 1048 /*30*/ __le32 s_wtime; /* Write time */ 1049 __le16 s_mnt_count; /* Mount count */ 1050 __le16 s_max_mnt_count; /* Maximal mount count */ 1051 __le16 s_magic; /* Magic signature */ 1052 __le16 s_state; /* File system state */ 1053 __le16 s_errors; /* Behaviour when detecting errors */ 1054 __le16 s_minor_rev_level; /* minor revision level */ 1055 /*40*/ __le32 s_lastcheck; /* time of last check */ 1056 __le32 s_checkinterval; /* max. time between checks */ 1057 __le32 s_creator_os; /* OS */ 1058 __le32 s_rev_level; /* Revision level */ 1059 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1060 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1061 /* 1062 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1063 * 1064 * Note: the difference between the compatible feature set and 1065 * the incompatible feature set is that if there is a bit set 1066 * in the incompatible feature set that the kernel doesn't 1067 * know about, it should refuse to mount the filesystem. 1068 * 1069 * e2fsck's requirements are more strict; if it doesn't know 1070 * about a feature in either the compatible or incompatible 1071 * feature set, it must abort and not try to meddle with 1072 * things it doesn't understand... 1073 */ 1074 __le32 s_first_ino; /* First non-reserved inode */ 1075 __le16 s_inode_size; /* size of inode structure */ 1076 __le16 s_block_group_nr; /* block group # of this superblock */ 1077 __le32 s_feature_compat; /* compatible feature set */ 1078 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1079 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1080 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1081 /*78*/ char s_volume_name[16]; /* volume name */ 1082 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 1083 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1084 /* 1085 * Performance hints. Directory preallocation should only 1086 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1087 */ 1088 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1089 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1090 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1091 /* 1092 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1093 */ 1094 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1095 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1096 __le32 s_journal_dev; /* device number of journal file */ 1097 __le32 s_last_orphan; /* start of list of inodes to delete */ 1098 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1099 __u8 s_def_hash_version; /* Default hash version to use */ 1100 __u8 s_jnl_backup_type; 1101 __le16 s_desc_size; /* size of group descriptor */ 1102 /*100*/ __le32 s_default_mount_opts; 1103 __le32 s_first_meta_bg; /* First metablock block group */ 1104 __le32 s_mkfs_time; /* When the filesystem was created */ 1105 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1106 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1107 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1108 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1109 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1110 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1111 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1112 __le32 s_flags; /* Miscellaneous flags */ 1113 __le16 s_raid_stride; /* RAID stride */ 1114 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1115 __le64 s_mmp_block; /* Block for multi-mount protection */ 1116 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1117 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1118 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1119 __le16 s_reserved_pad; 1120 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1121 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1122 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1123 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1124 snapshot's future use */ 1125 __le32 s_snapshot_list; /* inode number of the head of the 1126 on-disk snapshot list */ 1127 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1128 __le32 s_error_count; /* number of fs errors */ 1129 __le32 s_first_error_time; /* first time an error happened */ 1130 __le32 s_first_error_ino; /* inode involved in first error */ 1131 __le64 s_first_error_block; /* block involved of first error */ 1132 __u8 s_first_error_func[32]; /* function where the error happened */ 1133 __le32 s_first_error_line; /* line number where error happened */ 1134 __le32 s_last_error_time; /* most recent time of an error */ 1135 __le32 s_last_error_ino; /* inode involved in last error */ 1136 __le32 s_last_error_line; /* line number where error happened */ 1137 __le64 s_last_error_block; /* block involved of last error */ 1138 __u8 s_last_error_func[32]; /* function where the error happened */ 1139 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1140 __u8 s_mount_opts[64]; 1141 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1142 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1143 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1144 __le32 s_reserved[108]; /* Padding to the end of the block */ 1145 __le32 s_checksum; /* crc32c(superblock) */ 1146 }; 1147 1148 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1149 1150 #ifdef __KERNEL__ 1151 1152 /* 1153 * run-time mount flags 1154 */ 1155 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1156 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1157 1158 /* 1159 * fourth extended-fs super-block data in memory 1160 */ 1161 struct ext4_sb_info { 1162 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1163 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1164 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1165 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1166 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1167 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1168 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1169 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1170 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1171 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1172 unsigned long s_overhead; /* # of fs overhead clusters */ 1173 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1174 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1175 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1176 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1177 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1178 struct buffer_head **s_group_desc; 1179 unsigned int s_mount_opt; 1180 unsigned int s_mount_opt2; 1181 unsigned int s_mount_flags; 1182 unsigned int s_def_mount_opt; 1183 ext4_fsblk_t s_sb_block; 1184 atomic64_t s_resv_clusters; 1185 kuid_t s_resuid; 1186 kgid_t s_resgid; 1187 unsigned short s_mount_state; 1188 unsigned short s_pad; 1189 int s_addr_per_block_bits; 1190 int s_desc_per_block_bits; 1191 int s_inode_size; 1192 int s_first_ino; 1193 unsigned int s_inode_readahead_blks; 1194 unsigned int s_inode_goal; 1195 spinlock_t s_next_gen_lock; 1196 u32 s_next_generation; 1197 u32 s_hash_seed[4]; 1198 int s_def_hash_version; 1199 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1200 struct percpu_counter s_freeclusters_counter; 1201 struct percpu_counter s_freeinodes_counter; 1202 struct percpu_counter s_dirs_counter; 1203 struct percpu_counter s_dirtyclusters_counter; 1204 struct blockgroup_lock *s_blockgroup_lock; 1205 struct proc_dir_entry *s_proc; 1206 struct kobject s_kobj; 1207 struct completion s_kobj_unregister; 1208 struct super_block *s_sb; 1209 1210 /* Journaling */ 1211 struct journal_s *s_journal; 1212 struct list_head s_orphan; 1213 struct mutex s_orphan_lock; 1214 unsigned long s_resize_flags; /* Flags indicating if there 1215 is a resizer */ 1216 unsigned long s_commit_interval; 1217 u32 s_max_batch_time; 1218 u32 s_min_batch_time; 1219 struct block_device *journal_bdev; 1220 #ifdef CONFIG_QUOTA 1221 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ 1222 int s_jquota_fmt; /* Format of quota to use */ 1223 #endif 1224 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1225 struct rb_root system_blks; 1226 1227 #ifdef EXTENTS_STATS 1228 /* ext4 extents stats */ 1229 unsigned long s_ext_min; 1230 unsigned long s_ext_max; 1231 unsigned long s_depth_max; 1232 spinlock_t s_ext_stats_lock; 1233 unsigned long s_ext_blocks; 1234 unsigned long s_ext_extents; 1235 #endif 1236 1237 /* for buddy allocator */ 1238 struct ext4_group_info ***s_group_info; 1239 struct inode *s_buddy_cache; 1240 spinlock_t s_md_lock; 1241 unsigned short *s_mb_offsets; 1242 unsigned int *s_mb_maxs; 1243 unsigned int s_group_info_size; 1244 1245 /* tunables */ 1246 unsigned long s_stripe; 1247 unsigned int s_mb_stream_request; 1248 unsigned int s_mb_max_to_scan; 1249 unsigned int s_mb_min_to_scan; 1250 unsigned int s_mb_stats; 1251 unsigned int s_mb_order2_reqs; 1252 unsigned int s_mb_group_prealloc; 1253 unsigned int s_max_dir_size_kb; 1254 /* where last allocation was done - for stream allocation */ 1255 unsigned long s_mb_last_group; 1256 unsigned long s_mb_last_start; 1257 1258 /* stats for buddy allocator */ 1259 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1260 atomic_t s_bal_success; /* we found long enough chunks */ 1261 atomic_t s_bal_allocated; /* in blocks */ 1262 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1263 atomic_t s_bal_goals; /* goal hits */ 1264 atomic_t s_bal_breaks; /* too long searches */ 1265 atomic_t s_bal_2orders; /* 2^order hits */ 1266 spinlock_t s_bal_lock; 1267 unsigned long s_mb_buddies_generated; 1268 unsigned long long s_mb_generation_time; 1269 atomic_t s_mb_lost_chunks; 1270 atomic_t s_mb_preallocated; 1271 atomic_t s_mb_discarded; 1272 atomic_t s_lock_busy; 1273 1274 /* locality groups */ 1275 struct ext4_locality_group __percpu *s_locality_groups; 1276 1277 /* for write statistics */ 1278 unsigned long s_sectors_written_start; 1279 u64 s_kbytes_written; 1280 1281 /* the size of zero-out chunk */ 1282 unsigned int s_extent_max_zeroout_kb; 1283 1284 unsigned int s_log_groups_per_flex; 1285 struct flex_groups *s_flex_groups; 1286 ext4_group_t s_flex_groups_allocated; 1287 1288 /* workqueue for reserved extent conversions (buffered io) */ 1289 struct workqueue_struct *rsv_conversion_wq; 1290 1291 /* timer for periodic error stats printing */ 1292 struct timer_list s_err_report; 1293 1294 /* Lazy inode table initialization info */ 1295 struct ext4_li_request *s_li_request; 1296 /* Wait multiplier for lazy initialization thread */ 1297 unsigned int s_li_wait_mult; 1298 1299 /* Kernel thread for multiple mount protection */ 1300 struct task_struct *s_mmp_tsk; 1301 1302 /* record the last minlen when FITRIM is called. */ 1303 atomic_t s_last_trim_minblks; 1304 1305 /* Reference to checksum algorithm driver via cryptoapi */ 1306 struct crypto_shash *s_chksum_driver; 1307 1308 /* Precomputed FS UUID checksum for seeding other checksums */ 1309 __u32 s_csum_seed; 1310 1311 /* Reclaim extents from extent status tree */ 1312 struct shrinker s_es_shrinker; 1313 struct list_head s_es_lru; 1314 unsigned long s_es_last_sorted; 1315 struct percpu_counter s_extent_cache_cnt; 1316 spinlock_t s_es_lru_lock ____cacheline_aligned_in_smp; 1317 }; 1318 1319 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1320 { 1321 return sb->s_fs_info; 1322 } 1323 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1324 { 1325 return container_of(inode, struct ext4_inode_info, vfs_inode); 1326 } 1327 1328 static inline struct timespec ext4_current_time(struct inode *inode) 1329 { 1330 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1331 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1332 } 1333 1334 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1335 { 1336 return ino == EXT4_ROOT_INO || 1337 ino == EXT4_USR_QUOTA_INO || 1338 ino == EXT4_GRP_QUOTA_INO || 1339 ino == EXT4_BOOT_LOADER_INO || 1340 ino == EXT4_JOURNAL_INO || 1341 ino == EXT4_RESIZE_INO || 1342 (ino >= EXT4_FIRST_INO(sb) && 1343 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1344 } 1345 1346 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 1347 struct ext4_io_end *io_end) 1348 { 1349 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 1350 io_end->flag |= EXT4_IO_END_UNWRITTEN; 1351 atomic_inc(&EXT4_I(inode)->i_unwritten); 1352 } 1353 } 1354 1355 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode) 1356 { 1357 return inode->i_private; 1358 } 1359 1360 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io) 1361 { 1362 inode->i_private = io; 1363 } 1364 1365 /* 1366 * Inode dynamic state flags 1367 */ 1368 enum { 1369 EXT4_STATE_JDATA, /* journaled data exists */ 1370 EXT4_STATE_NEW, /* inode is newly created */ 1371 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1372 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1373 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1374 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1375 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1376 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1377 EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */ 1378 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read 1379 nolocking */ 1380 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1381 EXT4_STATE_ORDERED_MODE, /* data=ordered mode */ 1382 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1383 }; 1384 1385 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1386 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1387 { \ 1388 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1389 } \ 1390 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1391 { \ 1392 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1393 } \ 1394 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1395 { \ 1396 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1397 } 1398 1399 EXT4_INODE_BIT_FNS(flag, flags, 0) 1400 #if (BITS_PER_LONG < 64) 1401 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1402 1403 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1404 { 1405 (ei)->i_state_flags = 0; 1406 } 1407 #else 1408 EXT4_INODE_BIT_FNS(state, flags, 32) 1409 1410 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1411 { 1412 /* We depend on the fact that callers will set i_flags */ 1413 } 1414 #endif 1415 #else 1416 /* Assume that user mode programs are passing in an ext4fs superblock, not 1417 * a kernel struct super_block. This will allow us to call the feature-test 1418 * macros from user land. */ 1419 #define EXT4_SB(sb) (sb) 1420 #endif 1421 1422 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1423 1424 /* 1425 * Codes for operating systems 1426 */ 1427 #define EXT4_OS_LINUX 0 1428 #define EXT4_OS_HURD 1 1429 #define EXT4_OS_MASIX 2 1430 #define EXT4_OS_FREEBSD 3 1431 #define EXT4_OS_LITES 4 1432 1433 /* 1434 * Revision levels 1435 */ 1436 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1437 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1438 1439 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1440 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1441 1442 #define EXT4_GOOD_OLD_INODE_SIZE 128 1443 1444 /* 1445 * Feature set definitions 1446 */ 1447 1448 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1449 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1450 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1451 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1452 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1453 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1454 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1455 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1456 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1457 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1458 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1459 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1460 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1461 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1462 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1463 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1464 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1465 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1466 1467 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1468 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1469 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1470 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1471 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1472 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1473 1474 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1475 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1476 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1477 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1478 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1479 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1480 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1481 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1482 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1483 /* 1484 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1485 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1486 * all other data structures' checksums. However, the METADATA_CSUM and 1487 * GDT_CSUM bits are mutually exclusive. 1488 */ 1489 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1490 1491 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1492 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1493 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1494 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1495 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1496 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1497 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1498 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1499 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1500 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1501 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1502 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */ 1503 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1504 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1505 1506 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1507 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1508 EXT4_FEATURE_INCOMPAT_META_BG) 1509 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1510 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1511 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1512 1513 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1514 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1515 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1516 EXT4_FEATURE_INCOMPAT_META_BG) 1517 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1518 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1519 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1520 1521 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 1522 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1523 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1524 EXT4_FEATURE_INCOMPAT_META_BG| \ 1525 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1526 EXT4_FEATURE_INCOMPAT_64BIT| \ 1527 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1528 EXT4_FEATURE_INCOMPAT_MMP | \ 1529 EXT4_FEATURE_INCOMPAT_INLINE_DATA) 1530 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1531 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1532 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1533 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1534 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1535 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1536 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1537 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1538 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1539 EXT4_FEATURE_RO_COMPAT_QUOTA) 1540 1541 /* 1542 * Default values for user and/or group using reserved blocks 1543 */ 1544 #define EXT4_DEF_RESUID 0 1545 #define EXT4_DEF_RESGID 0 1546 1547 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1548 1549 /* 1550 * Default mount options 1551 */ 1552 #define EXT4_DEFM_DEBUG 0x0001 1553 #define EXT4_DEFM_BSDGROUPS 0x0002 1554 #define EXT4_DEFM_XATTR_USER 0x0004 1555 #define EXT4_DEFM_ACL 0x0008 1556 #define EXT4_DEFM_UID16 0x0010 1557 #define EXT4_DEFM_JMODE 0x0060 1558 #define EXT4_DEFM_JMODE_DATA 0x0020 1559 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1560 #define EXT4_DEFM_JMODE_WBACK 0x0060 1561 #define EXT4_DEFM_NOBARRIER 0x0100 1562 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1563 #define EXT4_DEFM_DISCARD 0x0400 1564 #define EXT4_DEFM_NODELALLOC 0x0800 1565 1566 /* 1567 * Default journal batch times 1568 */ 1569 #define EXT4_DEF_MIN_BATCH_TIME 0 1570 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1571 1572 /* 1573 * Minimum number of groups in a flexgroup before we separate out 1574 * directories into the first block group of a flexgroup 1575 */ 1576 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1577 1578 /* 1579 * Structure of a directory entry 1580 */ 1581 #define EXT4_NAME_LEN 255 1582 1583 struct ext4_dir_entry { 1584 __le32 inode; /* Inode number */ 1585 __le16 rec_len; /* Directory entry length */ 1586 __le16 name_len; /* Name length */ 1587 char name[EXT4_NAME_LEN]; /* File name */ 1588 }; 1589 1590 /* 1591 * The new version of the directory entry. Since EXT4 structures are 1592 * stored in intel byte order, and the name_len field could never be 1593 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1594 * file_type field. 1595 */ 1596 struct ext4_dir_entry_2 { 1597 __le32 inode; /* Inode number */ 1598 __le16 rec_len; /* Directory entry length */ 1599 __u8 name_len; /* Name length */ 1600 __u8 file_type; 1601 char name[EXT4_NAME_LEN]; /* File name */ 1602 }; 1603 1604 /* 1605 * This is a bogus directory entry at the end of each leaf block that 1606 * records checksums. 1607 */ 1608 struct ext4_dir_entry_tail { 1609 __le32 det_reserved_zero1; /* Pretend to be unused */ 1610 __le16 det_rec_len; /* 12 */ 1611 __u8 det_reserved_zero2; /* Zero name length */ 1612 __u8 det_reserved_ft; /* 0xDE, fake file type */ 1613 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1614 }; 1615 1616 #define EXT4_DIRENT_TAIL(block, blocksize) \ 1617 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 1618 ((blocksize) - \ 1619 sizeof(struct ext4_dir_entry_tail)))) 1620 1621 /* 1622 * Ext4 directory file types. Only the low 3 bits are used. The 1623 * other bits are reserved for now. 1624 */ 1625 #define EXT4_FT_UNKNOWN 0 1626 #define EXT4_FT_REG_FILE 1 1627 #define EXT4_FT_DIR 2 1628 #define EXT4_FT_CHRDEV 3 1629 #define EXT4_FT_BLKDEV 4 1630 #define EXT4_FT_FIFO 5 1631 #define EXT4_FT_SOCK 6 1632 #define EXT4_FT_SYMLINK 7 1633 1634 #define EXT4_FT_MAX 8 1635 1636 #define EXT4_FT_DIR_CSUM 0xDE 1637 1638 /* 1639 * EXT4_DIR_PAD defines the directory entries boundaries 1640 * 1641 * NOTE: It must be a multiple of 4 1642 */ 1643 #define EXT4_DIR_PAD 4 1644 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1645 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1646 ~EXT4_DIR_ROUND) 1647 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1648 1649 /* 1650 * If we ever get support for fs block sizes > page_size, we'll need 1651 * to remove the #if statements in the next two functions... 1652 */ 1653 static inline unsigned int 1654 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1655 { 1656 unsigned len = le16_to_cpu(dlen); 1657 1658 #if (PAGE_CACHE_SIZE >= 65536) 1659 if (len == EXT4_MAX_REC_LEN || len == 0) 1660 return blocksize; 1661 return (len & 65532) | ((len & 3) << 16); 1662 #else 1663 return len; 1664 #endif 1665 } 1666 1667 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1668 { 1669 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1670 BUG(); 1671 #if (PAGE_CACHE_SIZE >= 65536) 1672 if (len < 65536) 1673 return cpu_to_le16(len); 1674 if (len == blocksize) { 1675 if (blocksize == 65536) 1676 return cpu_to_le16(EXT4_MAX_REC_LEN); 1677 else 1678 return cpu_to_le16(0); 1679 } 1680 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 1681 #else 1682 return cpu_to_le16(len); 1683 #endif 1684 } 1685 1686 /* 1687 * Hash Tree Directory indexing 1688 * (c) Daniel Phillips, 2001 1689 */ 1690 1691 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 1692 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 1693 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 1694 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 1695 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 1696 1697 /* Legal values for the dx_root hash_version field: */ 1698 1699 #define DX_HASH_LEGACY 0 1700 #define DX_HASH_HALF_MD4 1 1701 #define DX_HASH_TEA 2 1702 #define DX_HASH_LEGACY_UNSIGNED 3 1703 #define DX_HASH_HALF_MD4_UNSIGNED 4 1704 #define DX_HASH_TEA_UNSIGNED 5 1705 1706 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 1707 const void *address, unsigned int length) 1708 { 1709 struct { 1710 struct shash_desc shash; 1711 char ctx[4]; 1712 } desc; 1713 int err; 1714 1715 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 1716 1717 desc.shash.tfm = sbi->s_chksum_driver; 1718 desc.shash.flags = 0; 1719 *(u32 *)desc.ctx = crc; 1720 1721 err = crypto_shash_update(&desc.shash, address, length); 1722 BUG_ON(err); 1723 1724 return *(u32 *)desc.ctx; 1725 } 1726 1727 #ifdef __KERNEL__ 1728 1729 /* hash info structure used by the directory hash */ 1730 struct dx_hash_info 1731 { 1732 u32 hash; 1733 u32 minor_hash; 1734 int hash_version; 1735 u32 *seed; 1736 }; 1737 1738 1739 /* 32 and 64 bit signed EOF for dx directories */ 1740 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 1741 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 1742 1743 1744 /* 1745 * Control parameters used by ext4_htree_next_block 1746 */ 1747 #define HASH_NB_ALWAYS 1 1748 1749 1750 /* 1751 * Describe an inode's exact location on disk and in memory 1752 */ 1753 struct ext4_iloc 1754 { 1755 struct buffer_head *bh; 1756 unsigned long offset; 1757 ext4_group_t block_group; 1758 }; 1759 1760 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 1761 { 1762 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 1763 } 1764 1765 /* 1766 * This structure is stuffed into the struct file's private_data field 1767 * for directories. It is where we put information so that we can do 1768 * readdir operations in hash tree order. 1769 */ 1770 struct dir_private_info { 1771 struct rb_root root; 1772 struct rb_node *curr_node; 1773 struct fname *extra_fname; 1774 loff_t last_pos; 1775 __u32 curr_hash; 1776 __u32 curr_minor_hash; 1777 __u32 next_hash; 1778 }; 1779 1780 /* calculate the first block number of the group */ 1781 static inline ext4_fsblk_t 1782 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 1783 { 1784 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 1785 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 1786 } 1787 1788 /* 1789 * Special error return code only used by dx_probe() and its callers. 1790 */ 1791 #define ERR_BAD_DX_DIR -75000 1792 1793 /* 1794 * Timeout and state flag for lazy initialization inode thread. 1795 */ 1796 #define EXT4_DEF_LI_WAIT_MULT 10 1797 #define EXT4_DEF_LI_MAX_START_DELAY 5 1798 #define EXT4_LAZYINIT_QUIT 0x0001 1799 #define EXT4_LAZYINIT_RUNNING 0x0002 1800 1801 /* 1802 * Lazy inode table initialization info 1803 */ 1804 struct ext4_lazy_init { 1805 unsigned long li_state; 1806 struct list_head li_request_list; 1807 struct mutex li_list_mtx; 1808 }; 1809 1810 struct ext4_li_request { 1811 struct super_block *lr_super; 1812 struct ext4_sb_info *lr_sbi; 1813 ext4_group_t lr_next_group; 1814 struct list_head lr_request; 1815 unsigned long lr_next_sched; 1816 unsigned long lr_timeout; 1817 }; 1818 1819 struct ext4_features { 1820 struct kobject f_kobj; 1821 struct completion f_kobj_unregister; 1822 }; 1823 1824 /* 1825 * This structure will be used for multiple mount protection. It will be 1826 * written into the block number saved in the s_mmp_block field in the 1827 * superblock. Programs that check MMP should assume that if 1828 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 1829 * to use the filesystem, regardless of how old the timestamp is. 1830 */ 1831 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 1832 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 1833 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 1834 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 1835 1836 struct mmp_struct { 1837 __le32 mmp_magic; /* Magic number for MMP */ 1838 __le32 mmp_seq; /* Sequence no. updated periodically */ 1839 1840 /* 1841 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 1842 * purposes and do not affect the correctness of the algorithm 1843 */ 1844 __le64 mmp_time; /* Time last updated */ 1845 char mmp_nodename[64]; /* Node which last updated MMP block */ 1846 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 1847 1848 /* 1849 * mmp_check_interval is used to verify if the MMP block has been 1850 * updated on the block device. The value is updated based on the 1851 * maximum time to write the MMP block during an update cycle. 1852 */ 1853 __le16 mmp_check_interval; 1854 1855 __le16 mmp_pad1; 1856 __le32 mmp_pad2[226]; 1857 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 1858 }; 1859 1860 /* arguments passed to the mmp thread */ 1861 struct mmpd_data { 1862 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 1863 struct super_block *sb; /* super block of the fs */ 1864 }; 1865 1866 /* 1867 * Check interval multiplier 1868 * The MMP block is written every update interval and initially checked every 1869 * update interval x the multiplier (the value is then adapted based on the 1870 * write latency). The reason is that writes can be delayed under load and we 1871 * don't want readers to incorrectly assume that the filesystem is no longer 1872 * in use. 1873 */ 1874 #define EXT4_MMP_CHECK_MULT 2UL 1875 1876 /* 1877 * Minimum interval for MMP checking in seconds. 1878 */ 1879 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 1880 1881 /* 1882 * Maximum interval for MMP checking in seconds. 1883 */ 1884 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 1885 1886 /* 1887 * Function prototypes 1888 */ 1889 1890 /* 1891 * Ok, these declarations are also in <linux/kernel.h> but none of the 1892 * ext4 source programs needs to include it so they are duplicated here. 1893 */ 1894 # define NORET_TYPE /**/ 1895 # define ATTRIB_NORET __attribute__((noreturn)) 1896 # define NORET_AND noreturn, 1897 1898 /* bitmap.c */ 1899 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 1900 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 1901 struct ext4_group_desc *gdp, 1902 struct buffer_head *bh, int sz); 1903 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 1904 struct ext4_group_desc *gdp, 1905 struct buffer_head *bh, int sz); 1906 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 1907 struct ext4_group_desc *gdp, 1908 struct buffer_head *bh); 1909 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 1910 struct ext4_group_desc *gdp, 1911 struct buffer_head *bh); 1912 1913 /* balloc.c */ 1914 extern void ext4_get_group_no_and_offset(struct super_block *sb, 1915 ext4_fsblk_t blocknr, 1916 ext4_group_t *blockgrpp, 1917 ext4_grpblk_t *offsetp); 1918 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 1919 ext4_fsblk_t block); 1920 1921 extern void ext4_validate_block_bitmap(struct super_block *sb, 1922 struct ext4_group_desc *desc, 1923 ext4_group_t block_group, 1924 struct buffer_head *bh); 1925 extern unsigned int ext4_block_group(struct super_block *sb, 1926 ext4_fsblk_t blocknr); 1927 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 1928 ext4_fsblk_t blocknr); 1929 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 1930 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 1931 ext4_group_t group); 1932 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 1933 ext4_fsblk_t goal, 1934 unsigned int flags, 1935 unsigned long *count, 1936 int *errp); 1937 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 1938 s64 nclusters, unsigned int flags); 1939 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 1940 extern void ext4_check_blocks_bitmap(struct super_block *); 1941 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 1942 ext4_group_t block_group, 1943 struct buffer_head ** bh); 1944 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1945 1946 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 1947 ext4_group_t block_group); 1948 extern int ext4_wait_block_bitmap(struct super_block *sb, 1949 ext4_group_t block_group, 1950 struct buffer_head *bh); 1951 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 1952 ext4_group_t block_group); 1953 extern void ext4_init_block_bitmap(struct super_block *sb, 1954 struct buffer_head *bh, 1955 ext4_group_t group, 1956 struct ext4_group_desc *desc); 1957 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 1958 ext4_group_t block_group, 1959 struct ext4_group_desc *gdp); 1960 extern unsigned ext4_num_overhead_clusters(struct super_block *sb, 1961 ext4_group_t block_group, 1962 struct ext4_group_desc *gdp); 1963 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 1964 1965 /* dir.c */ 1966 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 1967 struct file *, 1968 struct ext4_dir_entry_2 *, 1969 struct buffer_head *, char *, int, 1970 unsigned int); 1971 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 1972 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 1973 (de), (bh), (buf), (size), (offset))) 1974 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 1975 __u32 minor_hash, 1976 struct ext4_dir_entry_2 *dirent); 1977 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 1978 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 1979 struct buffer_head *bh, 1980 void *buf, int buf_size, 1981 const char *name, int namelen, 1982 struct ext4_dir_entry_2 **dest_de); 1983 void ext4_insert_dentry(struct inode *inode, 1984 struct ext4_dir_entry_2 *de, 1985 int buf_size, 1986 const char *name, int namelen); 1987 static inline void ext4_update_dx_flag(struct inode *inode) 1988 { 1989 if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb, 1990 EXT4_FEATURE_COMPAT_DIR_INDEX)) 1991 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 1992 } 1993 static unsigned char ext4_filetype_table[] = { 1994 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 1995 }; 1996 1997 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 1998 { 1999 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE) || 2000 (filetype >= EXT4_FT_MAX)) 2001 return DT_UNKNOWN; 2002 2003 return ext4_filetype_table[filetype]; 2004 } 2005 2006 /* fsync.c */ 2007 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2008 2009 /* hash.c */ 2010 extern int ext4fs_dirhash(const char *name, int len, struct 2011 dx_hash_info *hinfo); 2012 2013 /* ialloc.c */ 2014 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2015 const struct qstr *qstr, __u32 goal, 2016 uid_t *owner, int handle_type, 2017 unsigned int line_no, int nblocks); 2018 2019 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \ 2020 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2021 0, 0, 0) 2022 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2023 type, nblocks) \ 2024 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2025 (type), __LINE__, (nblocks)) 2026 2027 2028 extern void ext4_free_inode(handle_t *, struct inode *); 2029 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2030 extern unsigned long ext4_count_free_inodes(struct super_block *); 2031 extern unsigned long ext4_count_dirs(struct super_block *); 2032 extern void ext4_check_inodes_bitmap(struct super_block *); 2033 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2034 extern int ext4_init_inode_table(struct super_block *sb, 2035 ext4_group_t group, int barrier); 2036 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2037 2038 /* mballoc.c */ 2039 extern long ext4_mb_stats; 2040 extern long ext4_mb_max_to_scan; 2041 extern int ext4_mb_init(struct super_block *); 2042 extern int ext4_mb_release(struct super_block *); 2043 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2044 struct ext4_allocation_request *, int *); 2045 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2046 extern void ext4_discard_preallocations(struct inode *); 2047 extern int __init ext4_init_mballoc(void); 2048 extern void ext4_exit_mballoc(void); 2049 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2050 struct buffer_head *bh, ext4_fsblk_t block, 2051 unsigned long count, int flags); 2052 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2053 ext4_group_t ngroups); 2054 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2055 ext4_group_t i, struct ext4_group_desc *desc); 2056 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2057 ext4_fsblk_t block, unsigned long count); 2058 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2059 2060 /* inode.c */ 2061 struct buffer_head *ext4_getblk(handle_t *, struct inode *, 2062 ext4_lblk_t, int, int *); 2063 struct buffer_head *ext4_bread(handle_t *, struct inode *, 2064 ext4_lblk_t, int, int *); 2065 int ext4_get_block_write(struct inode *inode, sector_t iblock, 2066 struct buffer_head *bh_result, int create); 2067 int ext4_get_block(struct inode *inode, sector_t iblock, 2068 struct buffer_head *bh_result, int create); 2069 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2070 struct buffer_head *bh, int create); 2071 int ext4_walk_page_buffers(handle_t *handle, 2072 struct buffer_head *head, 2073 unsigned from, 2074 unsigned to, 2075 int *partial, 2076 int (*fn)(handle_t *handle, 2077 struct buffer_head *bh)); 2078 int do_journal_get_write_access(handle_t *handle, 2079 struct buffer_head *bh); 2080 #define FALL_BACK_TO_NONDELALLOC 1 2081 #define CONVERT_INLINE_DATA 2 2082 2083 extern struct inode *ext4_iget(struct super_block *, unsigned long); 2084 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2085 extern int ext4_setattr(struct dentry *, struct iattr *); 2086 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 2087 struct kstat *stat); 2088 extern void ext4_evict_inode(struct inode *); 2089 extern void ext4_clear_inode(struct inode *); 2090 extern int ext4_sync_inode(handle_t *, struct inode *); 2091 extern void ext4_dirty_inode(struct inode *, int); 2092 extern int ext4_change_inode_journal_flag(struct inode *, int); 2093 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2094 extern int ext4_inode_attach_jinode(struct inode *inode); 2095 extern int ext4_can_truncate(struct inode *inode); 2096 extern void ext4_truncate(struct inode *); 2097 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2098 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 2099 extern void ext4_set_inode_flags(struct inode *); 2100 extern void ext4_get_inode_flags(struct ext4_inode_info *); 2101 extern int ext4_alloc_da_blocks(struct inode *inode); 2102 extern void ext4_set_aops(struct inode *inode); 2103 extern int ext4_writepage_trans_blocks(struct inode *); 2104 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2105 extern int ext4_block_truncate_page(handle_t *handle, 2106 struct address_space *mapping, loff_t from); 2107 extern int ext4_block_zero_page_range(handle_t *handle, 2108 struct address_space *mapping, loff_t from, loff_t length); 2109 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2110 loff_t lstart, loff_t lend); 2111 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 2112 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2113 extern void ext4_da_update_reserve_space(struct inode *inode, 2114 int used, int quota_claim); 2115 2116 /* indirect.c */ 2117 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2118 struct ext4_map_blocks *map, int flags); 2119 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb, 2120 const struct iovec *iov, loff_t offset, 2121 unsigned long nr_segs); 2122 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2123 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2124 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2125 extern int ext4_free_hole_blocks(handle_t *handle, struct inode *inode, 2126 ext4_lblk_t first, ext4_lblk_t stop); 2127 2128 /* ioctl.c */ 2129 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2130 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2131 2132 /* migrate.c */ 2133 extern int ext4_ext_migrate(struct inode *); 2134 extern int ext4_ind_migrate(struct inode *inode); 2135 2136 /* namei.c */ 2137 extern int ext4_dirent_csum_verify(struct inode *inode, 2138 struct ext4_dir_entry *dirent); 2139 extern int ext4_orphan_add(handle_t *, struct inode *); 2140 extern int ext4_orphan_del(handle_t *, struct inode *); 2141 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2142 __u32 start_minor_hash, __u32 *next_hash); 2143 extern int search_dir(struct buffer_head *bh, 2144 char *search_buf, 2145 int buf_size, 2146 struct inode *dir, 2147 const struct qstr *d_name, 2148 unsigned int offset, 2149 struct ext4_dir_entry_2 **res_dir); 2150 extern int ext4_generic_delete_entry(handle_t *handle, 2151 struct inode *dir, 2152 struct ext4_dir_entry_2 *de_del, 2153 struct buffer_head *bh, 2154 void *entry_buf, 2155 int buf_size, 2156 int csum_size); 2157 2158 /* resize.c */ 2159 extern int ext4_group_add(struct super_block *sb, 2160 struct ext4_new_group_data *input); 2161 extern int ext4_group_extend(struct super_block *sb, 2162 struct ext4_super_block *es, 2163 ext4_fsblk_t n_blocks_count); 2164 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2165 2166 /* super.c */ 2167 extern int ext4_calculate_overhead(struct super_block *sb); 2168 extern int ext4_superblock_csum_verify(struct super_block *sb, 2169 struct ext4_super_block *es); 2170 extern void ext4_superblock_csum_set(struct super_block *sb); 2171 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 2172 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 2173 extern void ext4_kvfree(void *ptr); 2174 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2175 ext4_group_t ngroup); 2176 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2177 char nbuf[16]); 2178 2179 extern __printf(4, 5) 2180 void __ext4_error(struct super_block *, const char *, unsigned int, 2181 const char *, ...); 2182 extern __printf(5, 6) 2183 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2184 const char *, ...); 2185 extern __printf(5, 6) 2186 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2187 const char *, ...); 2188 extern void __ext4_std_error(struct super_block *, const char *, 2189 unsigned int, int); 2190 extern __printf(4, 5) 2191 void __ext4_abort(struct super_block *, const char *, unsigned int, 2192 const char *, ...); 2193 extern __printf(4, 5) 2194 void __ext4_warning(struct super_block *, const char *, unsigned int, 2195 const char *, ...); 2196 extern __printf(3, 4) 2197 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2198 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2199 const char *, unsigned int, const char *); 2200 extern __printf(7, 8) 2201 void __ext4_grp_locked_error(const char *, unsigned int, 2202 struct super_block *, ext4_group_t, 2203 unsigned long, ext4_fsblk_t, 2204 const char *, ...); 2205 2206 #ifdef CONFIG_PRINTK 2207 2208 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2209 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__) 2210 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2211 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2212 #define ext4_error(sb, fmt, ...) \ 2213 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2214 #define ext4_abort(sb, fmt, ...) \ 2215 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2216 #define ext4_warning(sb, fmt, ...) \ 2217 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2218 #define ext4_msg(sb, level, fmt, ...) \ 2219 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 2220 #define dump_mmp_msg(sb, mmp, msg) \ 2221 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 2222 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2223 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 2224 fmt, ##__VA_ARGS__) 2225 2226 #else 2227 2228 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2229 do { \ 2230 no_printk(fmt, ##__VA_ARGS__); \ 2231 __ext4_error_inode(inode, "", 0, block, " "); \ 2232 } while (0) 2233 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2234 do { \ 2235 no_printk(fmt, ##__VA_ARGS__); \ 2236 __ext4_error_file(file, "", 0, block, " "); \ 2237 } while (0) 2238 #define ext4_error(sb, fmt, ...) \ 2239 do { \ 2240 no_printk(fmt, ##__VA_ARGS__); \ 2241 __ext4_error(sb, "", 0, " "); \ 2242 } while (0) 2243 #define ext4_abort(sb, fmt, ...) \ 2244 do { \ 2245 no_printk(fmt, ##__VA_ARGS__); \ 2246 __ext4_abort(sb, "", 0, " "); \ 2247 } while (0) 2248 #define ext4_warning(sb, fmt, ...) \ 2249 do { \ 2250 no_printk(fmt, ##__VA_ARGS__); \ 2251 __ext4_warning(sb, "", 0, " "); \ 2252 } while (0) 2253 #define ext4_msg(sb, level, fmt, ...) \ 2254 do { \ 2255 no_printk(fmt, ##__VA_ARGS__); \ 2256 __ext4_msg(sb, "", " "); \ 2257 } while (0) 2258 #define dump_mmp_msg(sb, mmp, msg) \ 2259 __dump_mmp_msg(sb, mmp, "", 0, "") 2260 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2261 do { \ 2262 no_printk(fmt, ##__VA_ARGS__); \ 2263 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 2264 } while (0) 2265 2266 #endif 2267 2268 extern void ext4_update_dynamic_rev(struct super_block *sb); 2269 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2270 __u32 compat); 2271 extern int ext4_update_rocompat_feature(handle_t *handle, 2272 struct super_block *sb, __u32 rocompat); 2273 extern int ext4_update_incompat_feature(handle_t *handle, 2274 struct super_block *sb, __u32 incompat); 2275 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2276 struct ext4_group_desc *bg); 2277 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2278 struct ext4_group_desc *bg); 2279 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2280 struct ext4_group_desc *bg); 2281 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2282 struct ext4_group_desc *bg); 2283 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2284 struct ext4_group_desc *bg); 2285 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2286 struct ext4_group_desc *bg); 2287 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2288 struct ext4_group_desc *bg); 2289 extern void ext4_block_bitmap_set(struct super_block *sb, 2290 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2291 extern void ext4_inode_bitmap_set(struct super_block *sb, 2292 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2293 extern void ext4_inode_table_set(struct super_block *sb, 2294 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2295 extern void ext4_free_group_clusters_set(struct super_block *sb, 2296 struct ext4_group_desc *bg, 2297 __u32 count); 2298 extern void ext4_free_inodes_set(struct super_block *sb, 2299 struct ext4_group_desc *bg, __u32 count); 2300 extern void ext4_used_dirs_set(struct super_block *sb, 2301 struct ext4_group_desc *bg, __u32 count); 2302 extern void ext4_itable_unused_set(struct super_block *sb, 2303 struct ext4_group_desc *bg, __u32 count); 2304 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2305 struct ext4_group_desc *gdp); 2306 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2307 struct ext4_group_desc *gdp); 2308 extern int ext4_register_li_request(struct super_block *sb, 2309 ext4_group_t first_not_zeroed); 2310 2311 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2312 { 2313 return EXT4_HAS_RO_COMPAT_FEATURE(sb, 2314 EXT4_FEATURE_RO_COMPAT_GDT_CSUM | 2315 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM); 2316 } 2317 2318 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2319 { 2320 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2321 le32_to_cpu(es->s_blocks_count_lo); 2322 } 2323 2324 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2325 { 2326 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2327 le32_to_cpu(es->s_r_blocks_count_lo); 2328 } 2329 2330 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2331 { 2332 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2333 le32_to_cpu(es->s_free_blocks_count_lo); 2334 } 2335 2336 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2337 ext4_fsblk_t blk) 2338 { 2339 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2340 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2341 } 2342 2343 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2344 ext4_fsblk_t blk) 2345 { 2346 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2347 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2348 } 2349 2350 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2351 ext4_fsblk_t blk) 2352 { 2353 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2354 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2355 } 2356 2357 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 2358 { 2359 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2360 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2361 le32_to_cpu(raw_inode->i_size_lo); 2362 else 2363 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2364 } 2365 2366 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2367 { 2368 raw_inode->i_size_lo = cpu_to_le32(i_size); 2369 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2370 } 2371 2372 static inline 2373 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2374 ext4_group_t group) 2375 { 2376 struct ext4_group_info ***grp_info; 2377 long indexv, indexh; 2378 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 2379 grp_info = EXT4_SB(sb)->s_group_info; 2380 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2381 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2382 return grp_info[indexv][indexh]; 2383 } 2384 2385 /* 2386 * Reading s_groups_count requires using smp_rmb() afterwards. See 2387 * the locking protocol documented in the comments of ext4_group_add() 2388 * in resize.c 2389 */ 2390 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2391 { 2392 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2393 2394 smp_rmb(); 2395 return ngroups; 2396 } 2397 2398 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2399 ext4_group_t block_group) 2400 { 2401 return block_group >> sbi->s_log_groups_per_flex; 2402 } 2403 2404 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2405 { 2406 return 1 << sbi->s_log_groups_per_flex; 2407 } 2408 2409 #define ext4_std_error(sb, errno) \ 2410 do { \ 2411 if ((errno)) \ 2412 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2413 } while (0) 2414 2415 #ifdef CONFIG_SMP 2416 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2417 * counters. So we need to make sure we have free clusters more 2418 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2419 */ 2420 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2421 #else 2422 #define EXT4_FREECLUSTERS_WATERMARK 0 2423 #endif 2424 2425 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 2426 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2427 { 2428 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 2429 !mutex_is_locked(&inode->i_mutex)); 2430 down_write(&EXT4_I(inode)->i_data_sem); 2431 if (newsize > EXT4_I(inode)->i_disksize) 2432 EXT4_I(inode)->i_disksize = newsize; 2433 up_write(&EXT4_I(inode)->i_data_sem); 2434 } 2435 2436 /* 2437 * Update i_disksize after writeback has been started. Races with truncate 2438 * are avoided by checking i_size under i_data_sem. 2439 */ 2440 static inline void ext4_wb_update_i_disksize(struct inode *inode, loff_t newsize) 2441 { 2442 loff_t i_size; 2443 2444 down_write(&EXT4_I(inode)->i_data_sem); 2445 i_size = i_size_read(inode); 2446 if (newsize > i_size) 2447 newsize = i_size; 2448 if (newsize > EXT4_I(inode)->i_disksize) 2449 EXT4_I(inode)->i_disksize = newsize; 2450 up_write(&EXT4_I(inode)->i_data_sem); 2451 } 2452 2453 struct ext4_group_info { 2454 unsigned long bb_state; 2455 struct rb_root bb_free_root; 2456 ext4_grpblk_t bb_first_free; /* first free block */ 2457 ext4_grpblk_t bb_free; /* total free blocks */ 2458 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 2459 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 2460 struct list_head bb_prealloc_list; 2461 #ifdef DOUBLE_CHECK 2462 void *bb_bitmap; 2463 #endif 2464 struct rw_semaphore alloc_sem; 2465 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2466 * regions, index is order. 2467 * bb_counters[3] = 5 means 2468 * 5 free 8-block regions. */ 2469 }; 2470 2471 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 2472 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 2473 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 2474 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 2475 2476 #define EXT4_MB_GRP_NEED_INIT(grp) \ 2477 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 2478 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 2479 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2480 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 2481 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2482 2483 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 2484 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2485 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 2486 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2487 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 2488 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2489 2490 #define EXT4_MAX_CONTENTION 8 2491 #define EXT4_CONTENTION_THRESHOLD 2 2492 2493 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2494 ext4_group_t group) 2495 { 2496 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2497 } 2498 2499 /* 2500 * Returns true if the filesystem is busy enough that attempts to 2501 * access the block group locks has run into contention. 2502 */ 2503 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 2504 { 2505 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 2506 } 2507 2508 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 2509 { 2510 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 2511 if (spin_trylock(lock)) 2512 /* 2513 * We're able to grab the lock right away, so drop the 2514 * lock contention counter. 2515 */ 2516 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 2517 else { 2518 /* 2519 * The lock is busy, so bump the contention counter, 2520 * and then wait on the spin lock. 2521 */ 2522 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 2523 EXT4_MAX_CONTENTION); 2524 spin_lock(lock); 2525 } 2526 } 2527 2528 static inline void ext4_unlock_group(struct super_block *sb, 2529 ext4_group_t group) 2530 { 2531 spin_unlock(ext4_group_lock_ptr(sb, group)); 2532 } 2533 2534 /* 2535 * Block validity checking 2536 */ 2537 #define ext4_check_indirect_blockref(inode, bh) \ 2538 ext4_check_blockref(__func__, __LINE__, inode, \ 2539 (__le32 *)(bh)->b_data, \ 2540 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 2541 2542 #define ext4_ind_check_inode(inode) \ 2543 ext4_check_blockref(__func__, __LINE__, inode, \ 2544 EXT4_I(inode)->i_data, \ 2545 EXT4_NDIR_BLOCKS) 2546 2547 /* 2548 * Inodes and files operations 2549 */ 2550 2551 /* dir.c */ 2552 extern const struct file_operations ext4_dir_operations; 2553 2554 /* file.c */ 2555 extern const struct inode_operations ext4_file_inode_operations; 2556 extern const struct file_operations ext4_file_operations; 2557 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 2558 extern void ext4_unwritten_wait(struct inode *inode); 2559 2560 /* inline.c */ 2561 extern int ext4_has_inline_data(struct inode *inode); 2562 extern int ext4_get_inline_size(struct inode *inode); 2563 extern int ext4_get_max_inline_size(struct inode *inode); 2564 extern int ext4_find_inline_data_nolock(struct inode *inode); 2565 extern void ext4_write_inline_data(struct inode *inode, 2566 struct ext4_iloc *iloc, 2567 void *buffer, loff_t pos, 2568 unsigned int len); 2569 extern int ext4_prepare_inline_data(handle_t *handle, struct inode *inode, 2570 unsigned int len); 2571 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 2572 unsigned int len); 2573 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 2574 2575 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 2576 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 2577 struct inode *inode, 2578 loff_t pos, unsigned len, 2579 unsigned flags, 2580 struct page **pagep); 2581 extern int ext4_write_inline_data_end(struct inode *inode, 2582 loff_t pos, unsigned len, 2583 unsigned copied, 2584 struct page *page); 2585 extern struct buffer_head * 2586 ext4_journalled_write_inline_data(struct inode *inode, 2587 unsigned len, 2588 struct page *page); 2589 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 2590 struct inode *inode, 2591 loff_t pos, unsigned len, 2592 unsigned flags, 2593 struct page **pagep, 2594 void **fsdata); 2595 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 2596 unsigned len, unsigned copied, 2597 struct page *page); 2598 extern int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry, 2599 struct inode *inode); 2600 extern int ext4_try_create_inline_dir(handle_t *handle, 2601 struct inode *parent, 2602 struct inode *inode); 2603 extern int ext4_read_inline_dir(struct file *filp, 2604 struct dir_context *ctx, 2605 int *has_inline_data); 2606 extern int htree_inlinedir_to_tree(struct file *dir_file, 2607 struct inode *dir, ext4_lblk_t block, 2608 struct dx_hash_info *hinfo, 2609 __u32 start_hash, __u32 start_minor_hash, 2610 int *has_inline_data); 2611 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 2612 const struct qstr *d_name, 2613 struct ext4_dir_entry_2 **res_dir, 2614 int *has_inline_data); 2615 extern int ext4_delete_inline_entry(handle_t *handle, 2616 struct inode *dir, 2617 struct ext4_dir_entry_2 *de_del, 2618 struct buffer_head *bh, 2619 int *has_inline_data); 2620 extern int empty_inline_dir(struct inode *dir, int *has_inline_data); 2621 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 2622 struct ext4_dir_entry_2 **parent_de, 2623 int *retval); 2624 extern int ext4_inline_data_fiemap(struct inode *inode, 2625 struct fiemap_extent_info *fieinfo, 2626 int *has_inline); 2627 extern int ext4_try_to_evict_inline_data(handle_t *handle, 2628 struct inode *inode, 2629 int needed); 2630 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline); 2631 2632 extern int ext4_convert_inline_data(struct inode *inode); 2633 2634 /* namei.c */ 2635 extern const struct inode_operations ext4_dir_inode_operations; 2636 extern const struct inode_operations ext4_special_inode_operations; 2637 extern struct dentry *ext4_get_parent(struct dentry *child); 2638 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 2639 struct ext4_dir_entry_2 *de, 2640 int blocksize, int csum_size, 2641 unsigned int parent_ino, int dotdot_real_len); 2642 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t, 2643 unsigned int blocksize); 2644 extern int ext4_handle_dirty_dirent_node(handle_t *handle, 2645 struct inode *inode, 2646 struct buffer_head *bh); 2647 #define S_SHIFT 12 2648 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = { 2649 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 2650 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 2651 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 2652 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 2653 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 2654 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 2655 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 2656 }; 2657 2658 static inline void ext4_set_de_type(struct super_block *sb, 2659 struct ext4_dir_entry_2 *de, 2660 umode_t mode) { 2661 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE)) 2662 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 2663 } 2664 2665 2666 /* symlink.c */ 2667 extern const struct inode_operations ext4_symlink_inode_operations; 2668 extern const struct inode_operations ext4_fast_symlink_inode_operations; 2669 2670 /* block_validity */ 2671 extern void ext4_release_system_zone(struct super_block *sb); 2672 extern int ext4_setup_system_zone(struct super_block *sb); 2673 extern int __init ext4_init_system_zone(void); 2674 extern void ext4_exit_system_zone(void); 2675 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 2676 ext4_fsblk_t start_blk, 2677 unsigned int count); 2678 extern int ext4_check_blockref(const char *, unsigned int, 2679 struct inode *, __le32 *, unsigned int); 2680 2681 /* extents.c */ 2682 struct ext4_ext_path; 2683 struct ext4_extent; 2684 2685 /* 2686 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 2687 * __le32. 2688 */ 2689 #define EXT_MAX_BLOCKS 0xffffffff 2690 2691 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 2692 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 2693 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 2694 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 2695 struct ext4_map_blocks *map, int flags); 2696 extern void ext4_ext_truncate(handle_t *, struct inode *); 2697 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 2698 ext4_lblk_t end); 2699 extern void ext4_ext_init(struct super_block *); 2700 extern void ext4_ext_release(struct super_block *); 2701 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 2702 loff_t len); 2703 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 2704 loff_t offset, ssize_t len); 2705 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 2706 struct ext4_map_blocks *map, int flags); 2707 extern int ext4_ext_calc_metadata_amount(struct inode *inode, 2708 ext4_lblk_t lblocks); 2709 extern int ext4_extent_tree_init(handle_t *, struct inode *); 2710 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 2711 int num, 2712 struct ext4_ext_path *path); 2713 extern int ext4_can_extents_be_merged(struct inode *inode, 2714 struct ext4_extent *ex1, 2715 struct ext4_extent *ex2); 2716 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 2717 struct ext4_ext_path *, 2718 struct ext4_extent *, int); 2719 extern struct ext4_ext_path *ext4_ext_find_extent(struct inode *, ext4_lblk_t, 2720 struct ext4_ext_path *, 2721 int flags); 2722 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 2723 extern int ext4_ext_check_inode(struct inode *inode); 2724 extern int ext4_find_delalloc_range(struct inode *inode, 2725 ext4_lblk_t lblk_start, 2726 ext4_lblk_t lblk_end); 2727 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk); 2728 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2729 __u64 start, __u64 len); 2730 extern int ext4_ext_precache(struct inode *inode); 2731 2732 /* move_extent.c */ 2733 extern void ext4_double_down_write_data_sem(struct inode *first, 2734 struct inode *second); 2735 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 2736 struct inode *donor_inode); 2737 void ext4_inode_double_lock(struct inode *inode1, struct inode *inode2); 2738 void ext4_inode_double_unlock(struct inode *inode1, struct inode *inode2); 2739 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 2740 __u64 start_orig, __u64 start_donor, 2741 __u64 len, __u64 *moved_len); 2742 2743 /* page-io.c */ 2744 extern int __init ext4_init_pageio(void); 2745 extern void ext4_exit_pageio(void); 2746 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 2747 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 2748 extern int ext4_put_io_end(ext4_io_end_t *io_end); 2749 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 2750 extern void ext4_io_submit_init(struct ext4_io_submit *io, 2751 struct writeback_control *wbc); 2752 extern void ext4_end_io_rsv_work(struct work_struct *work); 2753 extern void ext4_io_submit(struct ext4_io_submit *io); 2754 extern int ext4_bio_write_page(struct ext4_io_submit *io, 2755 struct page *page, 2756 int len, 2757 struct writeback_control *wbc); 2758 2759 /* mmp.c */ 2760 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 2761 extern void ext4_mmp_csum_set(struct super_block *sb, struct mmp_struct *mmp); 2762 extern int ext4_mmp_csum_verify(struct super_block *sb, 2763 struct mmp_struct *mmp); 2764 2765 /* 2766 * Note that these flags will never ever appear in a buffer_head's state flag. 2767 * See EXT4_MAP_... to see where this is used. 2768 */ 2769 enum ext4_state_bits { 2770 BH_Uninit /* blocks are allocated but uninitialized on disk */ 2771 = BH_JBDPrivateStart, 2772 BH_AllocFromCluster, /* allocated blocks were part of already 2773 * allocated cluster. */ 2774 }; 2775 2776 /* 2777 * Add new method to test whether block and inode bitmaps are properly 2778 * initialized. With uninit_bg reading the block from disk is not enough 2779 * to mark the bitmap uptodate. We need to also zero-out the bitmap 2780 */ 2781 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 2782 2783 static inline int bitmap_uptodate(struct buffer_head *bh) 2784 { 2785 return (buffer_uptodate(bh) && 2786 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 2787 } 2788 static inline void set_bitmap_uptodate(struct buffer_head *bh) 2789 { 2790 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 2791 } 2792 2793 /* 2794 * Disable DIO read nolock optimization, so new dioreaders will be forced 2795 * to grab i_mutex 2796 */ 2797 static inline void ext4_inode_block_unlocked_dio(struct inode *inode) 2798 { 2799 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 2800 smp_mb(); 2801 } 2802 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode) 2803 { 2804 smp_mb(); 2805 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 2806 } 2807 2808 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 2809 2810 /* For ioend & aio unwritten conversion wait queues */ 2811 #define EXT4_WQ_HASH_SZ 37 2812 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 2813 EXT4_WQ_HASH_SZ]) 2814 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\ 2815 EXT4_WQ_HASH_SZ]) 2816 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 2817 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; 2818 2819 #define EXT4_RESIZING 0 2820 extern int ext4_resize_begin(struct super_block *sb); 2821 extern void ext4_resize_end(struct super_block *sb); 2822 2823 #endif /* __KERNEL__ */ 2824 2825 #endif /* _EXT4_H */ 2826