1 /* 2 * ext4.h 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/include/linux/minix_fs.h 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 */ 15 16 #ifndef _EXT4_H 17 #define _EXT4_H 18 19 #include <linux/types.h> 20 #include <linux/blkdev.h> 21 #include <linux/magic.h> 22 #include <linux/jbd2.h> 23 #include <linux/quota.h> 24 #include <linux/rwsem.h> 25 #include <linux/rbtree.h> 26 #include <linux/seqlock.h> 27 #include <linux/mutex.h> 28 #include <linux/timer.h> 29 #include <linux/wait.h> 30 #include <linux/blockgroup_lock.h> 31 #include <linux/percpu_counter.h> 32 #include <linux/ratelimit.h> 33 #include <crypto/hash.h> 34 #include <linux/falloc.h> 35 #ifdef __KERNEL__ 36 #include <linux/compat.h> 37 #endif 38 39 /* 40 * The fourth extended filesystem constants/structures 41 */ 42 43 /* 44 * Define EXT4FS_DEBUG to produce debug messages 45 */ 46 #undef EXT4FS_DEBUG 47 48 /* 49 * Debug code 50 */ 51 #ifdef EXT4FS_DEBUG 52 #define ext4_debug(f, a...) \ 53 do { \ 54 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 55 __FILE__, __LINE__, __func__); \ 56 printk(KERN_DEBUG f, ## a); \ 57 } while (0) 58 #else 59 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 60 #endif 61 62 /* 63 * Turn on EXT_DEBUG to get lots of info about extents operations. 64 */ 65 #define EXT_DEBUG__ 66 #ifdef EXT_DEBUG 67 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__) 68 #else 69 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 70 #endif 71 72 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 73 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 74 75 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 76 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 77 78 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 79 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 80 81 /* data type for block offset of block group */ 82 typedef int ext4_grpblk_t; 83 84 /* data type for filesystem-wide blocks number */ 85 typedef unsigned long long ext4_fsblk_t; 86 87 /* data type for file logical block number */ 88 typedef __u32 ext4_lblk_t; 89 90 /* data type for block group number */ 91 typedef unsigned int ext4_group_t; 92 93 enum SHIFT_DIRECTION { 94 SHIFT_LEFT = 0, 95 SHIFT_RIGHT, 96 }; 97 98 /* 99 * Flags used in mballoc's allocation_context flags field. 100 * 101 * Also used to show what's going on for debugging purposes when the 102 * flag field is exported via the traceport interface 103 */ 104 105 /* prefer goal again. length */ 106 #define EXT4_MB_HINT_MERGE 0x0001 107 /* blocks already reserved */ 108 #define EXT4_MB_HINT_RESERVED 0x0002 109 /* metadata is being allocated */ 110 #define EXT4_MB_HINT_METADATA 0x0004 111 /* first blocks in the file */ 112 #define EXT4_MB_HINT_FIRST 0x0008 113 /* search for the best chunk */ 114 #define EXT4_MB_HINT_BEST 0x0010 115 /* data is being allocated */ 116 #define EXT4_MB_HINT_DATA 0x0020 117 /* don't preallocate (for tails) */ 118 #define EXT4_MB_HINT_NOPREALLOC 0x0040 119 /* allocate for locality group */ 120 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 121 /* allocate goal blocks or none */ 122 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 123 /* goal is meaningful */ 124 #define EXT4_MB_HINT_TRY_GOAL 0x0200 125 /* blocks already pre-reserved by delayed allocation */ 126 #define EXT4_MB_DELALLOC_RESERVED 0x0400 127 /* We are doing stream allocation */ 128 #define EXT4_MB_STREAM_ALLOC 0x0800 129 /* Use reserved root blocks if needed */ 130 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 131 /* Use blocks from reserved pool */ 132 #define EXT4_MB_USE_RESERVED 0x2000 133 134 struct ext4_allocation_request { 135 /* target inode for block we're allocating */ 136 struct inode *inode; 137 /* how many blocks we want to allocate */ 138 unsigned int len; 139 /* logical block in target inode */ 140 ext4_lblk_t logical; 141 /* the closest logical allocated block to the left */ 142 ext4_lblk_t lleft; 143 /* the closest logical allocated block to the right */ 144 ext4_lblk_t lright; 145 /* phys. target (a hint) */ 146 ext4_fsblk_t goal; 147 /* phys. block for the closest logical allocated block to the left */ 148 ext4_fsblk_t pleft; 149 /* phys. block for the closest logical allocated block to the right */ 150 ext4_fsblk_t pright; 151 /* flags. see above EXT4_MB_HINT_* */ 152 unsigned int flags; 153 }; 154 155 /* 156 * Logical to physical block mapping, used by ext4_map_blocks() 157 * 158 * This structure is used to pass requests into ext4_map_blocks() as 159 * well as to store the information returned by ext4_map_blocks(). It 160 * takes less room on the stack than a struct buffer_head. 161 */ 162 #define EXT4_MAP_NEW (1 << BH_New) 163 #define EXT4_MAP_MAPPED (1 << BH_Mapped) 164 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 165 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 166 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 167 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 168 169 struct ext4_map_blocks { 170 ext4_fsblk_t m_pblk; 171 ext4_lblk_t m_lblk; 172 unsigned int m_len; 173 unsigned int m_flags; 174 }; 175 176 /* 177 * Flags for ext4_io_end->flags 178 */ 179 #define EXT4_IO_END_UNWRITTEN 0x0001 180 181 /* 182 * For converting unwritten extents on a work queue. 'handle' is used for 183 * buffered writeback. 184 */ 185 typedef struct ext4_io_end { 186 struct list_head list; /* per-file finished IO list */ 187 handle_t *handle; /* handle reserved for extent 188 * conversion */ 189 struct inode *inode; /* file being written to */ 190 struct bio *bio; /* Linked list of completed 191 * bios covering the extent */ 192 unsigned int flag; /* unwritten or not */ 193 loff_t offset; /* offset in the file */ 194 ssize_t size; /* size of the extent */ 195 atomic_t count; /* reference counter */ 196 } ext4_io_end_t; 197 198 struct ext4_io_submit { 199 int io_op; 200 struct bio *io_bio; 201 ext4_io_end_t *io_end; 202 sector_t io_next_block; 203 }; 204 205 /* 206 * Special inodes numbers 207 */ 208 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 209 #define EXT4_ROOT_INO 2 /* Root inode */ 210 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 211 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 212 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 213 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 214 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 215 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 216 217 /* First non-reserved inode for old ext4 filesystems */ 218 #define EXT4_GOOD_OLD_FIRST_INO 11 219 220 /* 221 * Maximal count of links to a file 222 */ 223 #define EXT4_LINK_MAX 65000 224 225 /* 226 * Macro-instructions used to manage several block sizes 227 */ 228 #define EXT4_MIN_BLOCK_SIZE 1024 229 #define EXT4_MAX_BLOCK_SIZE 65536 230 #define EXT4_MIN_BLOCK_LOG_SIZE 10 231 #define EXT4_MAX_BLOCK_LOG_SIZE 16 232 #ifdef __KERNEL__ 233 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 234 #else 235 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 236 #endif 237 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 238 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 239 EXT4_SB(s)->s_cluster_bits) 240 #ifdef __KERNEL__ 241 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 242 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 243 #else 244 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 245 #endif 246 #ifdef __KERNEL__ 247 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 248 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 249 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 250 #else 251 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 252 EXT4_GOOD_OLD_INODE_SIZE : \ 253 (s)->s_inode_size) 254 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 255 EXT4_GOOD_OLD_FIRST_INO : \ 256 (s)->s_first_ino) 257 #endif 258 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 259 260 /* Translate a block number to a cluster number */ 261 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 262 /* Translate a cluster number to a block number */ 263 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 264 /* Translate # of blks to # of clusters */ 265 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 266 (sbi)->s_cluster_bits) 267 /* Mask out the low bits to get the starting block of the cluster */ 268 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 269 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 270 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 271 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 272 /* Get the cluster offset */ 273 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 274 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 275 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 276 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 277 278 /* 279 * Structure of a blocks group descriptor 280 */ 281 struct ext4_group_desc 282 { 283 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 284 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 285 __le32 bg_inode_table_lo; /* Inodes table block */ 286 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 287 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 288 __le16 bg_used_dirs_count_lo; /* Directories count */ 289 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 290 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 291 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 292 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 293 __le16 bg_itable_unused_lo; /* Unused inodes count */ 294 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 295 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 296 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 297 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 298 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 299 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 300 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 301 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 302 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 303 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 304 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 305 __u32 bg_reserved; 306 }; 307 308 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 309 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 310 sizeof(__le16)) 311 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 312 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 313 sizeof(__le16)) 314 315 /* 316 * Structure of a flex block group info 317 */ 318 319 struct flex_groups { 320 atomic64_t free_clusters; 321 atomic_t free_inodes; 322 atomic_t used_dirs; 323 }; 324 325 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 326 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 327 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 328 329 /* 330 * Macro-instructions used to manage group descriptors 331 */ 332 #define EXT4_MIN_DESC_SIZE 32 333 #define EXT4_MIN_DESC_SIZE_64BIT 64 334 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 335 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 336 #ifdef __KERNEL__ 337 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 338 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 339 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 340 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 341 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 342 #else 343 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 344 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 345 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 346 #endif 347 348 /* 349 * Constants relative to the data blocks 350 */ 351 #define EXT4_NDIR_BLOCKS 12 352 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 353 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 354 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 355 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 356 357 /* 358 * Inode flags 359 */ 360 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 361 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 362 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 363 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 364 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 365 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 366 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 367 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 368 /* Reserved for compression usage... */ 369 #define EXT4_DIRTY_FL 0x00000100 370 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 371 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 372 /* nb: was previously EXT2_ECOMPR_FL */ 373 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 374 /* End compression flags --- maybe not all used */ 375 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 376 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 377 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 378 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 379 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 380 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 381 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 382 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 383 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 384 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 385 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 386 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 387 388 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 389 #define EXT4_FL_USER_MODIFIABLE 0x004380FF /* User modifiable flags */ 390 391 /* Flags that should be inherited by new inodes from their parent. */ 392 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 393 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 394 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 395 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 396 397 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 398 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 399 400 /* Flags that are appropriate for non-directories/regular files. */ 401 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 402 403 /* Mask out flags that are inappropriate for the given type of inode. */ 404 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 405 { 406 if (S_ISDIR(mode)) 407 return flags; 408 else if (S_ISREG(mode)) 409 return flags & EXT4_REG_FLMASK; 410 else 411 return flags & EXT4_OTHER_FLMASK; 412 } 413 414 /* 415 * Inode flags used for atomic set/get 416 */ 417 enum { 418 EXT4_INODE_SECRM = 0, /* Secure deletion */ 419 EXT4_INODE_UNRM = 1, /* Undelete */ 420 EXT4_INODE_COMPR = 2, /* Compress file */ 421 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 422 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 423 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 424 EXT4_INODE_NODUMP = 6, /* do not dump file */ 425 EXT4_INODE_NOATIME = 7, /* do not update atime */ 426 /* Reserved for compression usage... */ 427 EXT4_INODE_DIRTY = 8, 428 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 429 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 430 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 431 /* End compression flags --- maybe not all used */ 432 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 433 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 434 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 435 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 436 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 437 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 438 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 439 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 440 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 441 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 442 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 443 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 444 }; 445 446 /* 447 * Since it's pretty easy to mix up bit numbers and hex values, we use a 448 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 449 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 450 * any extra space in the compiled kernel image, otherwise, the build will fail. 451 * It's important that these values are the same, since we are using 452 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 453 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 454 * values found in ext2, ext3 and ext4 filesystems, and of course the values 455 * defined in e2fsprogs. 456 * 457 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 458 */ 459 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 460 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 461 462 static inline void ext4_check_flag_values(void) 463 { 464 CHECK_FLAG_VALUE(SECRM); 465 CHECK_FLAG_VALUE(UNRM); 466 CHECK_FLAG_VALUE(COMPR); 467 CHECK_FLAG_VALUE(SYNC); 468 CHECK_FLAG_VALUE(IMMUTABLE); 469 CHECK_FLAG_VALUE(APPEND); 470 CHECK_FLAG_VALUE(NODUMP); 471 CHECK_FLAG_VALUE(NOATIME); 472 CHECK_FLAG_VALUE(DIRTY); 473 CHECK_FLAG_VALUE(COMPRBLK); 474 CHECK_FLAG_VALUE(NOCOMPR); 475 CHECK_FLAG_VALUE(ENCRYPT); 476 CHECK_FLAG_VALUE(INDEX); 477 CHECK_FLAG_VALUE(IMAGIC); 478 CHECK_FLAG_VALUE(JOURNAL_DATA); 479 CHECK_FLAG_VALUE(NOTAIL); 480 CHECK_FLAG_VALUE(DIRSYNC); 481 CHECK_FLAG_VALUE(TOPDIR); 482 CHECK_FLAG_VALUE(HUGE_FILE); 483 CHECK_FLAG_VALUE(EXTENTS); 484 CHECK_FLAG_VALUE(EA_INODE); 485 CHECK_FLAG_VALUE(EOFBLOCKS); 486 CHECK_FLAG_VALUE(INLINE_DATA); 487 CHECK_FLAG_VALUE(RESERVED); 488 } 489 490 /* Used to pass group descriptor data when online resize is done */ 491 struct ext4_new_group_input { 492 __u32 group; /* Group number for this data */ 493 __u64 block_bitmap; /* Absolute block number of block bitmap */ 494 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 495 __u64 inode_table; /* Absolute block number of inode table start */ 496 __u32 blocks_count; /* Total number of blocks in this group */ 497 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 498 __u16 unused; 499 }; 500 501 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 502 struct compat_ext4_new_group_input { 503 u32 group; 504 compat_u64 block_bitmap; 505 compat_u64 inode_bitmap; 506 compat_u64 inode_table; 507 u32 blocks_count; 508 u16 reserved_blocks; 509 u16 unused; 510 }; 511 #endif 512 513 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 514 struct ext4_new_group_data { 515 __u32 group; 516 __u64 block_bitmap; 517 __u64 inode_bitmap; 518 __u64 inode_table; 519 __u32 blocks_count; 520 __u16 reserved_blocks; 521 __u16 unused; 522 __u32 free_blocks_count; 523 }; 524 525 /* Indexes used to index group tables in ext4_new_group_data */ 526 enum { 527 BLOCK_BITMAP = 0, /* block bitmap */ 528 INODE_BITMAP, /* inode bitmap */ 529 INODE_TABLE, /* inode tables */ 530 GROUP_TABLE_COUNT, 531 }; 532 533 /* 534 * Flags used by ext4_map_blocks() 535 */ 536 /* Allocate any needed blocks and/or convert an unwritten 537 extent to be an initialized ext4 */ 538 #define EXT4_GET_BLOCKS_CREATE 0x0001 539 /* Request the creation of an unwritten extent */ 540 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 541 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 542 EXT4_GET_BLOCKS_CREATE) 543 /* Caller is from the delayed allocation writeout path 544 * finally doing the actual allocation of delayed blocks */ 545 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 546 /* caller is from the direct IO path, request to creation of an 547 unwritten extents if not allocated, split the unwritten 548 extent if blocks has been preallocated already*/ 549 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 550 #define EXT4_GET_BLOCKS_CONVERT 0x0010 551 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 552 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 553 /* Convert extent to initialized after IO complete */ 554 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 555 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 556 /* Eventual metadata allocation (due to growing extent tree) 557 * should not fail, so try to use reserved blocks for that.*/ 558 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 559 /* Don't normalize allocation size (used for fallocate) */ 560 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 561 /* Request will not result in inode size update (user for fallocate) */ 562 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 563 /* Do not take i_data_sem locking in ext4_map_blocks */ 564 #define EXT4_GET_BLOCKS_NO_LOCK 0x0100 565 /* Convert written extents to unwritten */ 566 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0200 567 568 /* 569 * The bit position of these flags must not overlap with any of the 570 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 571 * read_extent_tree_block(), ext4_split_extent_at(), 572 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 573 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 574 * caching the extents when reading from the extent tree while a 575 * truncate or punch hole operation is in progress. 576 */ 577 #define EXT4_EX_NOCACHE 0x40000000 578 #define EXT4_EX_FORCE_CACHE 0x20000000 579 580 /* 581 * Flags used by ext4_free_blocks 582 */ 583 #define EXT4_FREE_BLOCKS_METADATA 0x0001 584 #define EXT4_FREE_BLOCKS_FORGET 0x0002 585 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 586 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 587 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 588 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 589 590 /* Encryption algorithms */ 591 #define EXT4_ENCRYPTION_MODE_INVALID 0 592 #define EXT4_ENCRYPTION_MODE_AES_256_XTS 1 593 #define EXT4_ENCRYPTION_MODE_AES_256_GCM 2 594 #define EXT4_ENCRYPTION_MODE_AES_256_CBC 3 595 #define EXT4_ENCRYPTION_MODE_AES_256_CTS 4 596 597 #include "ext4_crypto.h" 598 599 /* 600 * ioctl commands 601 */ 602 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 603 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 604 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 605 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 606 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 607 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 608 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 609 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 610 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 611 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 612 #define EXT4_IOC_MIGRATE _IO('f', 9) 613 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 614 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 615 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 616 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 617 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 618 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 619 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 620 #define EXT4_IOC_SET_ENCRYPTION_POLICY _IOR('f', 19, struct ext4_encryption_policy) 621 #define EXT4_IOC_GET_ENCRYPTION_PWSALT _IOW('f', 20, __u8[16]) 622 #define EXT4_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct ext4_encryption_policy) 623 624 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 625 /* 626 * ioctl commands in 32 bit emulation 627 */ 628 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 629 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 630 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 631 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 632 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 633 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 634 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 635 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 636 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 637 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 638 #endif 639 640 /* Max physical block we can address w/o extents */ 641 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 642 643 /* 644 * Structure of an inode on the disk 645 */ 646 struct ext4_inode { 647 __le16 i_mode; /* File mode */ 648 __le16 i_uid; /* Low 16 bits of Owner Uid */ 649 __le32 i_size_lo; /* Size in bytes */ 650 __le32 i_atime; /* Access time */ 651 __le32 i_ctime; /* Inode Change time */ 652 __le32 i_mtime; /* Modification time */ 653 __le32 i_dtime; /* Deletion Time */ 654 __le16 i_gid; /* Low 16 bits of Group Id */ 655 __le16 i_links_count; /* Links count */ 656 __le32 i_blocks_lo; /* Blocks count */ 657 __le32 i_flags; /* File flags */ 658 union { 659 struct { 660 __le32 l_i_version; 661 } linux1; 662 struct { 663 __u32 h_i_translator; 664 } hurd1; 665 struct { 666 __u32 m_i_reserved1; 667 } masix1; 668 } osd1; /* OS dependent 1 */ 669 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 670 __le32 i_generation; /* File version (for NFS) */ 671 __le32 i_file_acl_lo; /* File ACL */ 672 __le32 i_size_high; 673 __le32 i_obso_faddr; /* Obsoleted fragment address */ 674 union { 675 struct { 676 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 677 __le16 l_i_file_acl_high; 678 __le16 l_i_uid_high; /* these 2 fields */ 679 __le16 l_i_gid_high; /* were reserved2[0] */ 680 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 681 __le16 l_i_reserved; 682 } linux2; 683 struct { 684 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 685 __u16 h_i_mode_high; 686 __u16 h_i_uid_high; 687 __u16 h_i_gid_high; 688 __u32 h_i_author; 689 } hurd2; 690 struct { 691 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 692 __le16 m_i_file_acl_high; 693 __u32 m_i_reserved2[2]; 694 } masix2; 695 } osd2; /* OS dependent 2 */ 696 __le16 i_extra_isize; 697 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 698 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 699 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 700 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 701 __le32 i_crtime; /* File Creation time */ 702 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 703 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 704 }; 705 706 struct move_extent { 707 __u32 reserved; /* should be zero */ 708 __u32 donor_fd; /* donor file descriptor */ 709 __u64 orig_start; /* logical start offset in block for orig */ 710 __u64 donor_start; /* logical start offset in block for donor */ 711 __u64 len; /* block length to be moved */ 712 __u64 moved_len; /* moved block length */ 713 }; 714 715 #define EXT4_EPOCH_BITS 2 716 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 717 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 718 719 /* 720 * Extended fields will fit into an inode if the filesystem was formatted 721 * with large inodes (-I 256 or larger) and there are not currently any EAs 722 * consuming all of the available space. For new inodes we always reserve 723 * enough space for the kernel's known extended fields, but for inodes 724 * created with an old kernel this might not have been the case. None of 725 * the extended inode fields is critical for correct filesystem operation. 726 * This macro checks if a certain field fits in the inode. Note that 727 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 728 */ 729 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 730 ((offsetof(typeof(*ext4_inode), field) + \ 731 sizeof((ext4_inode)->field)) \ 732 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 733 (einode)->i_extra_isize)) \ 734 735 static inline __le32 ext4_encode_extra_time(struct timespec *time) 736 { 737 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 738 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | 739 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); 740 } 741 742 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 743 { 744 if (sizeof(time->tv_sec) > 4) 745 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 746 << 32; 747 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 748 } 749 750 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 751 do { \ 752 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 753 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 754 (raw_inode)->xtime ## _extra = \ 755 ext4_encode_extra_time(&(inode)->xtime); \ 756 } while (0) 757 758 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 759 do { \ 760 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 761 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 762 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 763 (raw_inode)->xtime ## _extra = \ 764 ext4_encode_extra_time(&(einode)->xtime); \ 765 } while (0) 766 767 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 768 do { \ 769 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 770 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 771 ext4_decode_extra_time(&(inode)->xtime, \ 772 raw_inode->xtime ## _extra); \ 773 else \ 774 (inode)->xtime.tv_nsec = 0; \ 775 } while (0) 776 777 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 778 do { \ 779 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 780 (einode)->xtime.tv_sec = \ 781 (signed)le32_to_cpu((raw_inode)->xtime); \ 782 else \ 783 (einode)->xtime.tv_sec = 0; \ 784 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 785 ext4_decode_extra_time(&(einode)->xtime, \ 786 raw_inode->xtime ## _extra); \ 787 else \ 788 (einode)->xtime.tv_nsec = 0; \ 789 } while (0) 790 791 #define i_disk_version osd1.linux1.l_i_version 792 793 #if defined(__KERNEL__) || defined(__linux__) 794 #define i_reserved1 osd1.linux1.l_i_reserved1 795 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 796 #define i_blocks_high osd2.linux2.l_i_blocks_high 797 #define i_uid_low i_uid 798 #define i_gid_low i_gid 799 #define i_uid_high osd2.linux2.l_i_uid_high 800 #define i_gid_high osd2.linux2.l_i_gid_high 801 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 802 803 #elif defined(__GNU__) 804 805 #define i_translator osd1.hurd1.h_i_translator 806 #define i_uid_high osd2.hurd2.h_i_uid_high 807 #define i_gid_high osd2.hurd2.h_i_gid_high 808 #define i_author osd2.hurd2.h_i_author 809 810 #elif defined(__masix__) 811 812 #define i_reserved1 osd1.masix1.m_i_reserved1 813 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 814 #define i_reserved2 osd2.masix2.m_i_reserved2 815 816 #endif /* defined(__KERNEL__) || defined(__linux__) */ 817 818 #include "extents_status.h" 819 820 /* 821 * fourth extended file system inode data in memory 822 */ 823 struct ext4_inode_info { 824 __le32 i_data[15]; /* unconverted */ 825 __u32 i_dtime; 826 ext4_fsblk_t i_file_acl; 827 828 /* 829 * i_block_group is the number of the block group which contains 830 * this file's inode. Constant across the lifetime of the inode, 831 * it is ued for making block allocation decisions - we try to 832 * place a file's data blocks near its inode block, and new inodes 833 * near to their parent directory's inode. 834 */ 835 ext4_group_t i_block_group; 836 ext4_lblk_t i_dir_start_lookup; 837 #if (BITS_PER_LONG < 64) 838 unsigned long i_state_flags; /* Dynamic state flags */ 839 #endif 840 unsigned long i_flags; 841 842 /* 843 * Extended attributes can be read independently of the main file 844 * data. Taking i_mutex even when reading would cause contention 845 * between readers of EAs and writers of regular file data, so 846 * instead we synchronize on xattr_sem when reading or changing 847 * EAs. 848 */ 849 struct rw_semaphore xattr_sem; 850 851 struct list_head i_orphan; /* unlinked but open inodes */ 852 853 /* 854 * i_disksize keeps track of what the inode size is ON DISK, not 855 * in memory. During truncate, i_size is set to the new size by 856 * the VFS prior to calling ext4_truncate(), but the filesystem won't 857 * set i_disksize to 0 until the truncate is actually under way. 858 * 859 * The intent is that i_disksize always represents the blocks which 860 * are used by this file. This allows recovery to restart truncate 861 * on orphans if we crash during truncate. We actually write i_disksize 862 * into the on-disk inode when writing inodes out, instead of i_size. 863 * 864 * The only time when i_disksize and i_size may be different is when 865 * a truncate is in progress. The only things which change i_disksize 866 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 867 */ 868 loff_t i_disksize; 869 870 /* 871 * i_data_sem is for serialising ext4_truncate() against 872 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 873 * data tree are chopped off during truncate. We can't do that in 874 * ext4 because whenever we perform intermediate commits during 875 * truncate, the inode and all the metadata blocks *must* be in a 876 * consistent state which allows truncation of the orphans to restart 877 * during recovery. Hence we must fix the get_block-vs-truncate race 878 * by other means, so we have i_data_sem. 879 */ 880 struct rw_semaphore i_data_sem; 881 struct inode vfs_inode; 882 struct jbd2_inode *jinode; 883 884 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 885 886 /* 887 * File creation time. Its function is same as that of 888 * struct timespec i_{a,c,m}time in the generic inode. 889 */ 890 struct timespec i_crtime; 891 892 /* mballoc */ 893 struct list_head i_prealloc_list; 894 spinlock_t i_prealloc_lock; 895 896 /* extents status tree */ 897 struct ext4_es_tree i_es_tree; 898 rwlock_t i_es_lock; 899 struct list_head i_es_list; 900 unsigned int i_es_all_nr; /* protected by i_es_lock */ 901 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 902 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 903 extents to shrink. Protected by 904 i_es_lock */ 905 906 /* ialloc */ 907 ext4_group_t i_last_alloc_group; 908 909 /* allocation reservation info for delalloc */ 910 /* In case of bigalloc, these refer to clusters rather than blocks */ 911 unsigned int i_reserved_data_blocks; 912 unsigned int i_reserved_meta_blocks; 913 unsigned int i_allocated_meta_blocks; 914 ext4_lblk_t i_da_metadata_calc_last_lblock; 915 int i_da_metadata_calc_len; 916 917 /* on-disk additional length */ 918 __u16 i_extra_isize; 919 920 /* Indicate the inline data space. */ 921 u16 i_inline_off; 922 u16 i_inline_size; 923 924 #ifdef CONFIG_QUOTA 925 /* quota space reservation, managed internally by quota code */ 926 qsize_t i_reserved_quota; 927 #endif 928 929 /* Lock protecting lists below */ 930 spinlock_t i_completed_io_lock; 931 /* 932 * Completed IOs that need unwritten extents handling and have 933 * transaction reserved 934 */ 935 struct list_head i_rsv_conversion_list; 936 /* 937 * Completed IOs that need unwritten extents handling and don't have 938 * transaction reserved 939 */ 940 atomic_t i_ioend_count; /* Number of outstanding io_end structs */ 941 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 942 struct work_struct i_rsv_conversion_work; 943 944 spinlock_t i_block_reservation_lock; 945 946 /* 947 * Transactions that contain inode's metadata needed to complete 948 * fsync and fdatasync, respectively. 949 */ 950 tid_t i_sync_tid; 951 tid_t i_datasync_tid; 952 953 #ifdef CONFIG_QUOTA 954 struct dquot *i_dquot[MAXQUOTAS]; 955 #endif 956 957 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 958 __u32 i_csum_seed; 959 960 #ifdef CONFIG_EXT4_FS_ENCRYPTION 961 /* Encryption params */ 962 struct ext4_crypt_info *i_crypt_info; 963 #endif 964 }; 965 966 /* 967 * File system states 968 */ 969 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 970 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 971 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 972 973 /* 974 * Misc. filesystem flags 975 */ 976 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 977 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 978 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 979 980 /* 981 * Mount flags set via mount options or defaults 982 */ 983 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 984 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 985 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 986 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 987 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 988 #define EXT4_MOUNT_ERRORS_MASK 0x00070 989 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 990 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 991 #ifdef CONFIG_FS_DAX 992 #define EXT4_MOUNT_DAX 0x00200 /* Direct Access */ 993 #else 994 #define EXT4_MOUNT_DAX 0 995 #endif 996 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 997 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 998 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 999 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1000 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1001 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1002 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1003 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1004 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1005 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1006 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 1007 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 1008 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 1009 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1010 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1011 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1012 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1013 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1014 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1015 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1016 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1017 1018 /* 1019 * Mount flags set either automatically (could not be set by mount option) 1020 * based on per file system feature or property or in special cases such as 1021 * distinguishing between explicit mount option definition and default. 1022 */ 1023 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1024 specified delalloc */ 1025 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1026 size of blocksize * 8 1027 blocks */ 1028 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1029 file systems */ 1030 1031 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1032 ~EXT4_MOUNT_##opt 1033 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1034 EXT4_MOUNT_##opt 1035 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1036 EXT4_MOUNT_##opt) 1037 1038 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1039 ~EXT4_MOUNT2_##opt 1040 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1041 EXT4_MOUNT2_##opt 1042 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1043 EXT4_MOUNT2_##opt) 1044 1045 #define ext4_test_and_set_bit __test_and_set_bit_le 1046 #define ext4_set_bit __set_bit_le 1047 #define ext4_set_bit_atomic ext2_set_bit_atomic 1048 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1049 #define ext4_clear_bit __clear_bit_le 1050 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1051 #define ext4_test_bit test_bit_le 1052 #define ext4_find_next_zero_bit find_next_zero_bit_le 1053 #define ext4_find_next_bit find_next_bit_le 1054 1055 extern void ext4_set_bits(void *bm, int cur, int len); 1056 1057 /* 1058 * Maximal mount counts between two filesystem checks 1059 */ 1060 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1061 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1062 1063 /* 1064 * Behaviour when detecting errors 1065 */ 1066 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1067 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1068 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1069 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1070 1071 /* Metadata checksum algorithm codes */ 1072 #define EXT4_CRC32C_CHKSUM 1 1073 1074 /* 1075 * Structure of the super block 1076 */ 1077 struct ext4_super_block { 1078 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1079 __le32 s_blocks_count_lo; /* Blocks count */ 1080 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1081 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1082 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1083 __le32 s_first_data_block; /* First Data Block */ 1084 __le32 s_log_block_size; /* Block size */ 1085 __le32 s_log_cluster_size; /* Allocation cluster size */ 1086 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1087 __le32 s_clusters_per_group; /* # Clusters per group */ 1088 __le32 s_inodes_per_group; /* # Inodes per group */ 1089 __le32 s_mtime; /* Mount time */ 1090 /*30*/ __le32 s_wtime; /* Write time */ 1091 __le16 s_mnt_count; /* Mount count */ 1092 __le16 s_max_mnt_count; /* Maximal mount count */ 1093 __le16 s_magic; /* Magic signature */ 1094 __le16 s_state; /* File system state */ 1095 __le16 s_errors; /* Behaviour when detecting errors */ 1096 __le16 s_minor_rev_level; /* minor revision level */ 1097 /*40*/ __le32 s_lastcheck; /* time of last check */ 1098 __le32 s_checkinterval; /* max. time between checks */ 1099 __le32 s_creator_os; /* OS */ 1100 __le32 s_rev_level; /* Revision level */ 1101 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1102 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1103 /* 1104 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1105 * 1106 * Note: the difference between the compatible feature set and 1107 * the incompatible feature set is that if there is a bit set 1108 * in the incompatible feature set that the kernel doesn't 1109 * know about, it should refuse to mount the filesystem. 1110 * 1111 * e2fsck's requirements are more strict; if it doesn't know 1112 * about a feature in either the compatible or incompatible 1113 * feature set, it must abort and not try to meddle with 1114 * things it doesn't understand... 1115 */ 1116 __le32 s_first_ino; /* First non-reserved inode */ 1117 __le16 s_inode_size; /* size of inode structure */ 1118 __le16 s_block_group_nr; /* block group # of this superblock */ 1119 __le32 s_feature_compat; /* compatible feature set */ 1120 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1121 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1122 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1123 /*78*/ char s_volume_name[16]; /* volume name */ 1124 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 1125 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1126 /* 1127 * Performance hints. Directory preallocation should only 1128 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1129 */ 1130 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1131 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1132 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1133 /* 1134 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1135 */ 1136 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1137 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1138 __le32 s_journal_dev; /* device number of journal file */ 1139 __le32 s_last_orphan; /* start of list of inodes to delete */ 1140 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1141 __u8 s_def_hash_version; /* Default hash version to use */ 1142 __u8 s_jnl_backup_type; 1143 __le16 s_desc_size; /* size of group descriptor */ 1144 /*100*/ __le32 s_default_mount_opts; 1145 __le32 s_first_meta_bg; /* First metablock block group */ 1146 __le32 s_mkfs_time; /* When the filesystem was created */ 1147 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1148 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1149 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1150 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1151 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1152 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1153 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1154 __le32 s_flags; /* Miscellaneous flags */ 1155 __le16 s_raid_stride; /* RAID stride */ 1156 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1157 __le64 s_mmp_block; /* Block for multi-mount protection */ 1158 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1159 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1160 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1161 __u8 s_encryption_level; /* versioning level for encryption */ 1162 __u8 s_reserved_pad; /* Padding to next 32bits */ 1163 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1164 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1165 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1166 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1167 snapshot's future use */ 1168 __le32 s_snapshot_list; /* inode number of the head of the 1169 on-disk snapshot list */ 1170 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1171 __le32 s_error_count; /* number of fs errors */ 1172 __le32 s_first_error_time; /* first time an error happened */ 1173 __le32 s_first_error_ino; /* inode involved in first error */ 1174 __le64 s_first_error_block; /* block involved of first error */ 1175 __u8 s_first_error_func[32]; /* function where the error happened */ 1176 __le32 s_first_error_line; /* line number where error happened */ 1177 __le32 s_last_error_time; /* most recent time of an error */ 1178 __le32 s_last_error_ino; /* inode involved in last error */ 1179 __le32 s_last_error_line; /* line number where error happened */ 1180 __le64 s_last_error_block; /* block involved of last error */ 1181 __u8 s_last_error_func[32]; /* function where the error happened */ 1182 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1183 __u8 s_mount_opts[64]; 1184 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1185 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1186 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1187 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1188 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1189 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1190 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1191 __le32 s_reserved[100]; /* Padding to the end of the block */ 1192 __le32 s_checksum; /* crc32c(superblock) */ 1193 }; 1194 1195 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1196 1197 #ifdef __KERNEL__ 1198 1199 /* 1200 * run-time mount flags 1201 */ 1202 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1203 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1204 #define EXT4_MF_TEST_DUMMY_ENCRYPTION 0x0004 1205 1206 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1207 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \ 1208 EXT4_MF_TEST_DUMMY_ENCRYPTION)) 1209 #else 1210 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0) 1211 #endif 1212 1213 /* Number of quota types we support */ 1214 #define EXT4_MAXQUOTAS 2 1215 1216 /* 1217 * fourth extended-fs super-block data in memory 1218 */ 1219 struct ext4_sb_info { 1220 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1221 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1222 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1223 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1224 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1225 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1226 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1227 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1228 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1229 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1230 unsigned long s_overhead; /* # of fs overhead clusters */ 1231 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1232 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1233 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1234 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1235 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1236 struct buffer_head **s_group_desc; 1237 unsigned int s_mount_opt; 1238 unsigned int s_mount_opt2; 1239 unsigned int s_mount_flags; 1240 unsigned int s_def_mount_opt; 1241 ext4_fsblk_t s_sb_block; 1242 atomic64_t s_resv_clusters; 1243 kuid_t s_resuid; 1244 kgid_t s_resgid; 1245 unsigned short s_mount_state; 1246 unsigned short s_pad; 1247 int s_addr_per_block_bits; 1248 int s_desc_per_block_bits; 1249 int s_inode_size; 1250 int s_first_ino; 1251 unsigned int s_inode_readahead_blks; 1252 unsigned int s_inode_goal; 1253 spinlock_t s_next_gen_lock; 1254 u32 s_next_generation; 1255 u32 s_hash_seed[4]; 1256 int s_def_hash_version; 1257 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1258 struct percpu_counter s_freeclusters_counter; 1259 struct percpu_counter s_freeinodes_counter; 1260 struct percpu_counter s_dirs_counter; 1261 struct percpu_counter s_dirtyclusters_counter; 1262 struct blockgroup_lock *s_blockgroup_lock; 1263 struct proc_dir_entry *s_proc; 1264 struct kobject s_kobj; 1265 struct completion s_kobj_unregister; 1266 struct super_block *s_sb; 1267 1268 /* Journaling */ 1269 struct journal_s *s_journal; 1270 struct list_head s_orphan; 1271 struct mutex s_orphan_lock; 1272 unsigned long s_resize_flags; /* Flags indicating if there 1273 is a resizer */ 1274 unsigned long s_commit_interval; 1275 u32 s_max_batch_time; 1276 u32 s_min_batch_time; 1277 struct block_device *journal_bdev; 1278 #ifdef CONFIG_QUOTA 1279 char *s_qf_names[EXT4_MAXQUOTAS]; /* Names of quota files with journalled quota */ 1280 int s_jquota_fmt; /* Format of quota to use */ 1281 #endif 1282 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1283 struct rb_root system_blks; 1284 1285 #ifdef EXTENTS_STATS 1286 /* ext4 extents stats */ 1287 unsigned long s_ext_min; 1288 unsigned long s_ext_max; 1289 unsigned long s_depth_max; 1290 spinlock_t s_ext_stats_lock; 1291 unsigned long s_ext_blocks; 1292 unsigned long s_ext_extents; 1293 #endif 1294 1295 /* for buddy allocator */ 1296 struct ext4_group_info ***s_group_info; 1297 struct inode *s_buddy_cache; 1298 spinlock_t s_md_lock; 1299 unsigned short *s_mb_offsets; 1300 unsigned int *s_mb_maxs; 1301 unsigned int s_group_info_size; 1302 1303 /* tunables */ 1304 unsigned long s_stripe; 1305 unsigned int s_mb_stream_request; 1306 unsigned int s_mb_max_to_scan; 1307 unsigned int s_mb_min_to_scan; 1308 unsigned int s_mb_stats; 1309 unsigned int s_mb_order2_reqs; 1310 unsigned int s_mb_group_prealloc; 1311 unsigned int s_max_dir_size_kb; 1312 /* where last allocation was done - for stream allocation */ 1313 unsigned long s_mb_last_group; 1314 unsigned long s_mb_last_start; 1315 1316 /* stats for buddy allocator */ 1317 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1318 atomic_t s_bal_success; /* we found long enough chunks */ 1319 atomic_t s_bal_allocated; /* in blocks */ 1320 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1321 atomic_t s_bal_goals; /* goal hits */ 1322 atomic_t s_bal_breaks; /* too long searches */ 1323 atomic_t s_bal_2orders; /* 2^order hits */ 1324 spinlock_t s_bal_lock; 1325 unsigned long s_mb_buddies_generated; 1326 unsigned long long s_mb_generation_time; 1327 atomic_t s_mb_lost_chunks; 1328 atomic_t s_mb_preallocated; 1329 atomic_t s_mb_discarded; 1330 atomic_t s_lock_busy; 1331 1332 /* locality groups */ 1333 struct ext4_locality_group __percpu *s_locality_groups; 1334 1335 /* for write statistics */ 1336 unsigned long s_sectors_written_start; 1337 u64 s_kbytes_written; 1338 1339 /* the size of zero-out chunk */ 1340 unsigned int s_extent_max_zeroout_kb; 1341 1342 unsigned int s_log_groups_per_flex; 1343 struct flex_groups *s_flex_groups; 1344 ext4_group_t s_flex_groups_allocated; 1345 1346 /* workqueue for reserved extent conversions (buffered io) */ 1347 struct workqueue_struct *rsv_conversion_wq; 1348 1349 /* timer for periodic error stats printing */ 1350 struct timer_list s_err_report; 1351 1352 /* Lazy inode table initialization info */ 1353 struct ext4_li_request *s_li_request; 1354 /* Wait multiplier for lazy initialization thread */ 1355 unsigned int s_li_wait_mult; 1356 1357 /* Kernel thread for multiple mount protection */ 1358 struct task_struct *s_mmp_tsk; 1359 1360 /* record the last minlen when FITRIM is called. */ 1361 atomic_t s_last_trim_minblks; 1362 1363 /* Reference to checksum algorithm driver via cryptoapi */ 1364 struct crypto_shash *s_chksum_driver; 1365 1366 /* Precomputed FS UUID checksum for seeding other checksums */ 1367 __u32 s_csum_seed; 1368 1369 /* Reclaim extents from extent status tree */ 1370 struct shrinker s_es_shrinker; 1371 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1372 long s_es_nr_inode; 1373 struct ext4_es_stats s_es_stats; 1374 struct mb_cache *s_mb_cache; 1375 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1376 1377 /* Ratelimit ext4 messages. */ 1378 struct ratelimit_state s_err_ratelimit_state; 1379 struct ratelimit_state s_warning_ratelimit_state; 1380 struct ratelimit_state s_msg_ratelimit_state; 1381 }; 1382 1383 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1384 { 1385 return sb->s_fs_info; 1386 } 1387 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1388 { 1389 return container_of(inode, struct ext4_inode_info, vfs_inode); 1390 } 1391 1392 static inline struct timespec ext4_current_time(struct inode *inode) 1393 { 1394 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1395 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1396 } 1397 1398 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1399 { 1400 return ino == EXT4_ROOT_INO || 1401 ino == EXT4_USR_QUOTA_INO || 1402 ino == EXT4_GRP_QUOTA_INO || 1403 ino == EXT4_BOOT_LOADER_INO || 1404 ino == EXT4_JOURNAL_INO || 1405 ino == EXT4_RESIZE_INO || 1406 (ino >= EXT4_FIRST_INO(sb) && 1407 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1408 } 1409 1410 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 1411 struct ext4_io_end *io_end) 1412 { 1413 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 1414 io_end->flag |= EXT4_IO_END_UNWRITTEN; 1415 atomic_inc(&EXT4_I(inode)->i_unwritten); 1416 } 1417 } 1418 1419 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode) 1420 { 1421 return inode->i_private; 1422 } 1423 1424 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io) 1425 { 1426 inode->i_private = io; 1427 } 1428 1429 /* 1430 * Inode dynamic state flags 1431 */ 1432 enum { 1433 EXT4_STATE_JDATA, /* journaled data exists */ 1434 EXT4_STATE_NEW, /* inode is newly created */ 1435 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1436 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1437 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1438 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1439 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1440 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1441 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read 1442 nolocking */ 1443 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1444 EXT4_STATE_ORDERED_MODE, /* data=ordered mode */ 1445 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1446 }; 1447 1448 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1449 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1450 { \ 1451 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1452 } \ 1453 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1454 { \ 1455 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1456 } \ 1457 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1458 { \ 1459 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1460 } 1461 1462 /* Add these declarations here only so that these functions can be 1463 * found by name. Otherwise, they are very hard to locate. */ 1464 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1465 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1466 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1467 EXT4_INODE_BIT_FNS(flag, flags, 0) 1468 1469 /* Add these declarations here only so that these functions can be 1470 * found by name. Otherwise, they are very hard to locate. */ 1471 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1472 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1473 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1474 #if (BITS_PER_LONG < 64) 1475 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1476 1477 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1478 { 1479 (ei)->i_state_flags = 0; 1480 } 1481 #else 1482 EXT4_INODE_BIT_FNS(state, flags, 32) 1483 1484 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1485 { 1486 /* We depend on the fact that callers will set i_flags */ 1487 } 1488 #endif 1489 #else 1490 /* Assume that user mode programs are passing in an ext4fs superblock, not 1491 * a kernel struct super_block. This will allow us to call the feature-test 1492 * macros from user land. */ 1493 #define EXT4_SB(sb) (sb) 1494 #endif 1495 1496 /* 1497 * Returns true if the inode is inode is encrypted 1498 */ 1499 static inline int ext4_encrypted_inode(struct inode *inode) 1500 { 1501 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1502 return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT); 1503 #else 1504 return 0; 1505 #endif 1506 } 1507 1508 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1509 1510 /* 1511 * Codes for operating systems 1512 */ 1513 #define EXT4_OS_LINUX 0 1514 #define EXT4_OS_HURD 1 1515 #define EXT4_OS_MASIX 2 1516 #define EXT4_OS_FREEBSD 3 1517 #define EXT4_OS_LITES 4 1518 1519 /* 1520 * Revision levels 1521 */ 1522 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1523 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1524 1525 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1526 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1527 1528 #define EXT4_GOOD_OLD_INODE_SIZE 128 1529 1530 /* 1531 * Feature set definitions 1532 */ 1533 1534 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1535 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1536 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1537 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1538 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1539 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1540 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1541 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1542 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1543 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1544 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1545 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1546 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1547 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1548 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1549 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1550 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1551 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1552 1553 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1554 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1555 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1556 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1557 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1558 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1559 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1560 1561 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1562 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1563 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1564 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1565 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1566 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1567 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1568 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1569 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1570 /* 1571 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1572 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1573 * all other data structures' checksums. However, the METADATA_CSUM and 1574 * GDT_CSUM bits are mutually exclusive. 1575 */ 1576 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1577 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1578 1579 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1580 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1581 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1582 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1583 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1584 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1585 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1586 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1587 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1588 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1589 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1590 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */ 1591 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1592 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1593 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1594 1595 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1596 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1597 EXT4_FEATURE_INCOMPAT_META_BG) 1598 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1599 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1600 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1601 1602 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1603 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1604 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1605 EXT4_FEATURE_INCOMPAT_META_BG) 1606 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1607 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1608 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1609 1610 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 1611 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1612 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1613 EXT4_FEATURE_INCOMPAT_META_BG| \ 1614 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1615 EXT4_FEATURE_INCOMPAT_64BIT| \ 1616 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1617 EXT4_FEATURE_INCOMPAT_MMP | \ 1618 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 1619 EXT4_FEATURE_INCOMPAT_ENCRYPT) 1620 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1621 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1622 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1623 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1624 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1625 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1626 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1627 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1628 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1629 EXT4_FEATURE_RO_COMPAT_QUOTA) 1630 1631 /* 1632 * Default values for user and/or group using reserved blocks 1633 */ 1634 #define EXT4_DEF_RESUID 0 1635 #define EXT4_DEF_RESGID 0 1636 1637 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1638 1639 /* 1640 * Default mount options 1641 */ 1642 #define EXT4_DEFM_DEBUG 0x0001 1643 #define EXT4_DEFM_BSDGROUPS 0x0002 1644 #define EXT4_DEFM_XATTR_USER 0x0004 1645 #define EXT4_DEFM_ACL 0x0008 1646 #define EXT4_DEFM_UID16 0x0010 1647 #define EXT4_DEFM_JMODE 0x0060 1648 #define EXT4_DEFM_JMODE_DATA 0x0020 1649 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1650 #define EXT4_DEFM_JMODE_WBACK 0x0060 1651 #define EXT4_DEFM_NOBARRIER 0x0100 1652 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1653 #define EXT4_DEFM_DISCARD 0x0400 1654 #define EXT4_DEFM_NODELALLOC 0x0800 1655 1656 /* 1657 * Default journal batch times 1658 */ 1659 #define EXT4_DEF_MIN_BATCH_TIME 0 1660 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1661 1662 /* 1663 * Minimum number of groups in a flexgroup before we separate out 1664 * directories into the first block group of a flexgroup 1665 */ 1666 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1667 1668 /* 1669 * Structure of a directory entry 1670 */ 1671 #define EXT4_NAME_LEN 255 1672 1673 struct ext4_dir_entry { 1674 __le32 inode; /* Inode number */ 1675 __le16 rec_len; /* Directory entry length */ 1676 __le16 name_len; /* Name length */ 1677 char name[EXT4_NAME_LEN]; /* File name */ 1678 }; 1679 1680 /* 1681 * The new version of the directory entry. Since EXT4 structures are 1682 * stored in intel byte order, and the name_len field could never be 1683 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1684 * file_type field. 1685 */ 1686 struct ext4_dir_entry_2 { 1687 __le32 inode; /* Inode number */ 1688 __le16 rec_len; /* Directory entry length */ 1689 __u8 name_len; /* Name length */ 1690 __u8 file_type; 1691 char name[EXT4_NAME_LEN]; /* File name */ 1692 }; 1693 1694 /* 1695 * This is a bogus directory entry at the end of each leaf block that 1696 * records checksums. 1697 */ 1698 struct ext4_dir_entry_tail { 1699 __le32 det_reserved_zero1; /* Pretend to be unused */ 1700 __le16 det_rec_len; /* 12 */ 1701 __u8 det_reserved_zero2; /* Zero name length */ 1702 __u8 det_reserved_ft; /* 0xDE, fake file type */ 1703 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1704 }; 1705 1706 #define EXT4_DIRENT_TAIL(block, blocksize) \ 1707 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 1708 ((blocksize) - \ 1709 sizeof(struct ext4_dir_entry_tail)))) 1710 1711 /* 1712 * Ext4 directory file types. Only the low 3 bits are used. The 1713 * other bits are reserved for now. 1714 */ 1715 #define EXT4_FT_UNKNOWN 0 1716 #define EXT4_FT_REG_FILE 1 1717 #define EXT4_FT_DIR 2 1718 #define EXT4_FT_CHRDEV 3 1719 #define EXT4_FT_BLKDEV 4 1720 #define EXT4_FT_FIFO 5 1721 #define EXT4_FT_SOCK 6 1722 #define EXT4_FT_SYMLINK 7 1723 1724 #define EXT4_FT_MAX 8 1725 1726 #define EXT4_FT_DIR_CSUM 0xDE 1727 1728 /* 1729 * EXT4_DIR_PAD defines the directory entries boundaries 1730 * 1731 * NOTE: It must be a multiple of 4 1732 */ 1733 #define EXT4_DIR_PAD 4 1734 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1735 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1736 ~EXT4_DIR_ROUND) 1737 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1738 1739 /* 1740 * If we ever get support for fs block sizes > page_size, we'll need 1741 * to remove the #if statements in the next two functions... 1742 */ 1743 static inline unsigned int 1744 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1745 { 1746 unsigned len = le16_to_cpu(dlen); 1747 1748 #if (PAGE_CACHE_SIZE >= 65536) 1749 if (len == EXT4_MAX_REC_LEN || len == 0) 1750 return blocksize; 1751 return (len & 65532) | ((len & 3) << 16); 1752 #else 1753 return len; 1754 #endif 1755 } 1756 1757 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1758 { 1759 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1760 BUG(); 1761 #if (PAGE_CACHE_SIZE >= 65536) 1762 if (len < 65536) 1763 return cpu_to_le16(len); 1764 if (len == blocksize) { 1765 if (blocksize == 65536) 1766 return cpu_to_le16(EXT4_MAX_REC_LEN); 1767 else 1768 return cpu_to_le16(0); 1769 } 1770 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 1771 #else 1772 return cpu_to_le16(len); 1773 #endif 1774 } 1775 1776 /* 1777 * Hash Tree Directory indexing 1778 * (c) Daniel Phillips, 2001 1779 */ 1780 1781 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 1782 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 1783 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 1784 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 1785 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 1786 1787 /* Legal values for the dx_root hash_version field: */ 1788 1789 #define DX_HASH_LEGACY 0 1790 #define DX_HASH_HALF_MD4 1 1791 #define DX_HASH_TEA 2 1792 #define DX_HASH_LEGACY_UNSIGNED 3 1793 #define DX_HASH_HALF_MD4_UNSIGNED 4 1794 #define DX_HASH_TEA_UNSIGNED 5 1795 1796 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 1797 const void *address, unsigned int length) 1798 { 1799 struct { 1800 struct shash_desc shash; 1801 char ctx[4]; 1802 } desc; 1803 int err; 1804 1805 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 1806 1807 desc.shash.tfm = sbi->s_chksum_driver; 1808 desc.shash.flags = 0; 1809 *(u32 *)desc.ctx = crc; 1810 1811 err = crypto_shash_update(&desc.shash, address, length); 1812 BUG_ON(err); 1813 1814 return *(u32 *)desc.ctx; 1815 } 1816 1817 #ifdef __KERNEL__ 1818 1819 /* hash info structure used by the directory hash */ 1820 struct dx_hash_info 1821 { 1822 u32 hash; 1823 u32 minor_hash; 1824 int hash_version; 1825 u32 *seed; 1826 }; 1827 1828 1829 /* 32 and 64 bit signed EOF for dx directories */ 1830 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 1831 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 1832 1833 1834 /* 1835 * Control parameters used by ext4_htree_next_block 1836 */ 1837 #define HASH_NB_ALWAYS 1 1838 1839 struct ext4_filename { 1840 const struct qstr *usr_fname; 1841 struct ext4_str disk_name; 1842 struct dx_hash_info hinfo; 1843 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1844 struct ext4_str crypto_buf; 1845 #endif 1846 }; 1847 1848 #define fname_name(p) ((p)->disk_name.name) 1849 #define fname_len(p) ((p)->disk_name.len) 1850 1851 /* 1852 * Describe an inode's exact location on disk and in memory 1853 */ 1854 struct ext4_iloc 1855 { 1856 struct buffer_head *bh; 1857 unsigned long offset; 1858 ext4_group_t block_group; 1859 }; 1860 1861 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 1862 { 1863 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 1864 } 1865 1866 /* 1867 * This structure is stuffed into the struct file's private_data field 1868 * for directories. It is where we put information so that we can do 1869 * readdir operations in hash tree order. 1870 */ 1871 struct dir_private_info { 1872 struct rb_root root; 1873 struct rb_node *curr_node; 1874 struct fname *extra_fname; 1875 loff_t last_pos; 1876 __u32 curr_hash; 1877 __u32 curr_minor_hash; 1878 __u32 next_hash; 1879 }; 1880 1881 /* calculate the first block number of the group */ 1882 static inline ext4_fsblk_t 1883 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 1884 { 1885 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 1886 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 1887 } 1888 1889 /* 1890 * Special error return code only used by dx_probe() and its callers. 1891 */ 1892 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 1893 1894 /* 1895 * Timeout and state flag for lazy initialization inode thread. 1896 */ 1897 #define EXT4_DEF_LI_WAIT_MULT 10 1898 #define EXT4_DEF_LI_MAX_START_DELAY 5 1899 #define EXT4_LAZYINIT_QUIT 0x0001 1900 #define EXT4_LAZYINIT_RUNNING 0x0002 1901 1902 /* 1903 * Lazy inode table initialization info 1904 */ 1905 struct ext4_lazy_init { 1906 unsigned long li_state; 1907 struct list_head li_request_list; 1908 struct mutex li_list_mtx; 1909 }; 1910 1911 struct ext4_li_request { 1912 struct super_block *lr_super; 1913 struct ext4_sb_info *lr_sbi; 1914 ext4_group_t lr_next_group; 1915 struct list_head lr_request; 1916 unsigned long lr_next_sched; 1917 unsigned long lr_timeout; 1918 }; 1919 1920 struct ext4_features { 1921 struct kobject f_kobj; 1922 struct completion f_kobj_unregister; 1923 }; 1924 1925 /* 1926 * This structure will be used for multiple mount protection. It will be 1927 * written into the block number saved in the s_mmp_block field in the 1928 * superblock. Programs that check MMP should assume that if 1929 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 1930 * to use the filesystem, regardless of how old the timestamp is. 1931 */ 1932 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 1933 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 1934 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 1935 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 1936 1937 struct mmp_struct { 1938 __le32 mmp_magic; /* Magic number for MMP */ 1939 __le32 mmp_seq; /* Sequence no. updated periodically */ 1940 1941 /* 1942 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 1943 * purposes and do not affect the correctness of the algorithm 1944 */ 1945 __le64 mmp_time; /* Time last updated */ 1946 char mmp_nodename[64]; /* Node which last updated MMP block */ 1947 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 1948 1949 /* 1950 * mmp_check_interval is used to verify if the MMP block has been 1951 * updated on the block device. The value is updated based on the 1952 * maximum time to write the MMP block during an update cycle. 1953 */ 1954 __le16 mmp_check_interval; 1955 1956 __le16 mmp_pad1; 1957 __le32 mmp_pad2[226]; 1958 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 1959 }; 1960 1961 /* arguments passed to the mmp thread */ 1962 struct mmpd_data { 1963 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 1964 struct super_block *sb; /* super block of the fs */ 1965 }; 1966 1967 /* 1968 * Check interval multiplier 1969 * The MMP block is written every update interval and initially checked every 1970 * update interval x the multiplier (the value is then adapted based on the 1971 * write latency). The reason is that writes can be delayed under load and we 1972 * don't want readers to incorrectly assume that the filesystem is no longer 1973 * in use. 1974 */ 1975 #define EXT4_MMP_CHECK_MULT 2UL 1976 1977 /* 1978 * Minimum interval for MMP checking in seconds. 1979 */ 1980 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 1981 1982 /* 1983 * Maximum interval for MMP checking in seconds. 1984 */ 1985 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 1986 1987 /* 1988 * Function prototypes 1989 */ 1990 1991 /* 1992 * Ok, these declarations are also in <linux/kernel.h> but none of the 1993 * ext4 source programs needs to include it so they are duplicated here. 1994 */ 1995 # define NORET_TYPE /**/ 1996 # define ATTRIB_NORET __attribute__((noreturn)) 1997 # define NORET_AND noreturn, 1998 1999 /* bitmap.c */ 2000 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2001 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2002 struct ext4_group_desc *gdp, 2003 struct buffer_head *bh, int sz); 2004 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2005 struct ext4_group_desc *gdp, 2006 struct buffer_head *bh, int sz); 2007 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2008 struct ext4_group_desc *gdp, 2009 struct buffer_head *bh); 2010 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2011 struct ext4_group_desc *gdp, 2012 struct buffer_head *bh); 2013 2014 /* balloc.c */ 2015 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2016 ext4_fsblk_t blocknr, 2017 ext4_group_t *blockgrpp, 2018 ext4_grpblk_t *offsetp); 2019 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2020 ext4_fsblk_t block); 2021 2022 extern unsigned int ext4_block_group(struct super_block *sb, 2023 ext4_fsblk_t blocknr); 2024 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2025 ext4_fsblk_t blocknr); 2026 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2027 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2028 ext4_group_t group); 2029 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2030 ext4_fsblk_t goal, 2031 unsigned int flags, 2032 unsigned long *count, 2033 int *errp); 2034 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2035 s64 nclusters, unsigned int flags); 2036 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2037 extern void ext4_check_blocks_bitmap(struct super_block *); 2038 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2039 ext4_group_t block_group, 2040 struct buffer_head ** bh); 2041 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2042 2043 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2044 ext4_group_t block_group); 2045 extern int ext4_wait_block_bitmap(struct super_block *sb, 2046 ext4_group_t block_group, 2047 struct buffer_head *bh); 2048 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2049 ext4_group_t block_group); 2050 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2051 ext4_group_t block_group, 2052 struct ext4_group_desc *gdp); 2053 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2054 2055 /* crypto_policy.c */ 2056 int ext4_is_child_context_consistent_with_parent(struct inode *parent, 2057 struct inode *child); 2058 int ext4_inherit_context(struct inode *parent, struct inode *child); 2059 void ext4_to_hex(char *dst, char *src, size_t src_size); 2060 int ext4_process_policy(const struct ext4_encryption_policy *policy, 2061 struct inode *inode); 2062 int ext4_get_policy(struct inode *inode, 2063 struct ext4_encryption_policy *policy); 2064 2065 /* crypto.c */ 2066 extern struct kmem_cache *ext4_crypt_info_cachep; 2067 bool ext4_valid_contents_enc_mode(uint32_t mode); 2068 uint32_t ext4_validate_encryption_key_size(uint32_t mode, uint32_t size); 2069 extern struct workqueue_struct *ext4_read_workqueue; 2070 struct ext4_crypto_ctx *ext4_get_crypto_ctx(struct inode *inode); 2071 void ext4_release_crypto_ctx(struct ext4_crypto_ctx *ctx); 2072 void ext4_restore_control_page(struct page *data_page); 2073 struct page *ext4_encrypt(struct inode *inode, 2074 struct page *plaintext_page); 2075 int ext4_decrypt(struct ext4_crypto_ctx *ctx, struct page *page); 2076 int ext4_decrypt_one(struct inode *inode, struct page *page); 2077 int ext4_encrypted_zeroout(struct inode *inode, struct ext4_extent *ex); 2078 2079 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2080 int ext4_init_crypto(void); 2081 void ext4_exit_crypto(void); 2082 static inline int ext4_sb_has_crypto(struct super_block *sb) 2083 { 2084 return EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT); 2085 } 2086 #else 2087 static inline int ext4_init_crypto(void) { return 0; } 2088 static inline void ext4_exit_crypto(void) { } 2089 static inline int ext4_sb_has_crypto(struct super_block *sb) 2090 { 2091 return 0; 2092 } 2093 #endif 2094 2095 /* crypto_fname.c */ 2096 bool ext4_valid_filenames_enc_mode(uint32_t mode); 2097 u32 ext4_fname_crypto_round_up(u32 size, u32 blksize); 2098 unsigned ext4_fname_encrypted_size(struct inode *inode, u32 ilen); 2099 int ext4_fname_crypto_alloc_buffer(struct inode *inode, 2100 u32 ilen, struct ext4_str *crypto_str); 2101 int _ext4_fname_disk_to_usr(struct inode *inode, 2102 struct dx_hash_info *hinfo, 2103 const struct ext4_str *iname, 2104 struct ext4_str *oname); 2105 int ext4_fname_disk_to_usr(struct inode *inode, 2106 struct dx_hash_info *hinfo, 2107 const struct ext4_dir_entry_2 *de, 2108 struct ext4_str *oname); 2109 int ext4_fname_usr_to_disk(struct inode *inode, 2110 const struct qstr *iname, 2111 struct ext4_str *oname); 2112 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2113 void ext4_fname_crypto_free_buffer(struct ext4_str *crypto_str); 2114 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname, 2115 int lookup, struct ext4_filename *fname); 2116 void ext4_fname_free_filename(struct ext4_filename *fname); 2117 #else 2118 static inline 2119 int ext4_setup_fname_crypto(struct inode *inode) 2120 { 2121 return 0; 2122 } 2123 static inline void ext4_fname_crypto_free_buffer(struct ext4_str *p) { } 2124 static inline int ext4_fname_setup_filename(struct inode *dir, 2125 const struct qstr *iname, 2126 int lookup, struct ext4_filename *fname) 2127 { 2128 fname->usr_fname = iname; 2129 fname->disk_name.name = (unsigned char *) iname->name; 2130 fname->disk_name.len = iname->len; 2131 return 0; 2132 } 2133 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { } 2134 #endif 2135 2136 2137 /* crypto_key.c */ 2138 void ext4_free_crypt_info(struct ext4_crypt_info *ci); 2139 void ext4_free_encryption_info(struct inode *inode, struct ext4_crypt_info *ci); 2140 int _ext4_get_encryption_info(struct inode *inode); 2141 2142 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2143 int ext4_has_encryption_key(struct inode *inode); 2144 2145 static inline int ext4_get_encryption_info(struct inode *inode) 2146 { 2147 struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info; 2148 2149 if (!ci || 2150 (ci->ci_keyring_key && 2151 (ci->ci_keyring_key->flags & ((1 << KEY_FLAG_INVALIDATED) | 2152 (1 << KEY_FLAG_REVOKED) | 2153 (1 << KEY_FLAG_DEAD))))) 2154 return _ext4_get_encryption_info(inode); 2155 return 0; 2156 } 2157 2158 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode) 2159 { 2160 return EXT4_I(inode)->i_crypt_info; 2161 } 2162 2163 #else 2164 static inline int ext4_has_encryption_key(struct inode *inode) 2165 { 2166 return 0; 2167 } 2168 static inline int ext4_get_encryption_info(struct inode *inode) 2169 { 2170 return 0; 2171 } 2172 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode) 2173 { 2174 return NULL; 2175 } 2176 #endif 2177 2178 2179 /* dir.c */ 2180 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2181 struct file *, 2182 struct ext4_dir_entry_2 *, 2183 struct buffer_head *, char *, int, 2184 unsigned int); 2185 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2186 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2187 (de), (bh), (buf), (size), (offset))) 2188 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2189 __u32 minor_hash, 2190 struct ext4_dir_entry_2 *dirent, 2191 struct ext4_str *ent_name); 2192 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2193 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2194 struct buffer_head *bh, 2195 void *buf, int buf_size, 2196 struct ext4_filename *fname, 2197 struct ext4_dir_entry_2 **dest_de); 2198 int ext4_insert_dentry(struct inode *dir, 2199 struct inode *inode, 2200 struct ext4_dir_entry_2 *de, 2201 int buf_size, 2202 struct ext4_filename *fname); 2203 static inline void ext4_update_dx_flag(struct inode *inode) 2204 { 2205 if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb, 2206 EXT4_FEATURE_COMPAT_DIR_INDEX)) 2207 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2208 } 2209 static unsigned char ext4_filetype_table[] = { 2210 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2211 }; 2212 2213 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2214 { 2215 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE) || 2216 (filetype >= EXT4_FT_MAX)) 2217 return DT_UNKNOWN; 2218 2219 return ext4_filetype_table[filetype]; 2220 } 2221 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2222 void *buf, int buf_size); 2223 2224 /* fsync.c */ 2225 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2226 2227 /* hash.c */ 2228 extern int ext4fs_dirhash(const char *name, int len, struct 2229 dx_hash_info *hinfo); 2230 2231 /* ialloc.c */ 2232 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2233 const struct qstr *qstr, __u32 goal, 2234 uid_t *owner, int handle_type, 2235 unsigned int line_no, int nblocks); 2236 2237 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \ 2238 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2239 0, 0, 0) 2240 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2241 type, nblocks) \ 2242 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2243 (type), __LINE__, (nblocks)) 2244 2245 2246 extern void ext4_free_inode(handle_t *, struct inode *); 2247 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2248 extern unsigned long ext4_count_free_inodes(struct super_block *); 2249 extern unsigned long ext4_count_dirs(struct super_block *); 2250 extern void ext4_check_inodes_bitmap(struct super_block *); 2251 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2252 extern int ext4_init_inode_table(struct super_block *sb, 2253 ext4_group_t group, int barrier); 2254 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2255 2256 /* mballoc.c */ 2257 extern long ext4_mb_stats; 2258 extern long ext4_mb_max_to_scan; 2259 extern int ext4_mb_init(struct super_block *); 2260 extern int ext4_mb_release(struct super_block *); 2261 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2262 struct ext4_allocation_request *, int *); 2263 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2264 extern void ext4_discard_preallocations(struct inode *); 2265 extern int __init ext4_init_mballoc(void); 2266 extern void ext4_exit_mballoc(void); 2267 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2268 struct buffer_head *bh, ext4_fsblk_t block, 2269 unsigned long count, int flags); 2270 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2271 ext4_group_t ngroups); 2272 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2273 ext4_group_t i, struct ext4_group_desc *desc); 2274 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2275 ext4_fsblk_t block, unsigned long count); 2276 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2277 2278 /* inode.c */ 2279 int ext4_inode_is_fast_symlink(struct inode *inode); 2280 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2281 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2282 int ext4_get_block_write(struct inode *inode, sector_t iblock, 2283 struct buffer_head *bh_result, int create); 2284 int ext4_get_block(struct inode *inode, sector_t iblock, 2285 struct buffer_head *bh_result, int create); 2286 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2287 struct buffer_head *bh, int create); 2288 int ext4_walk_page_buffers(handle_t *handle, 2289 struct buffer_head *head, 2290 unsigned from, 2291 unsigned to, 2292 int *partial, 2293 int (*fn)(handle_t *handle, 2294 struct buffer_head *bh)); 2295 int do_journal_get_write_access(handle_t *handle, 2296 struct buffer_head *bh); 2297 #define FALL_BACK_TO_NONDELALLOC 1 2298 #define CONVERT_INLINE_DATA 2 2299 2300 extern struct inode *ext4_iget(struct super_block *, unsigned long); 2301 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long); 2302 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2303 extern int ext4_setattr(struct dentry *, struct iattr *); 2304 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 2305 struct kstat *stat); 2306 extern void ext4_evict_inode(struct inode *); 2307 extern void ext4_clear_inode(struct inode *); 2308 extern int ext4_sync_inode(handle_t *, struct inode *); 2309 extern void ext4_dirty_inode(struct inode *, int); 2310 extern int ext4_change_inode_journal_flag(struct inode *, int); 2311 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2312 extern int ext4_inode_attach_jinode(struct inode *inode); 2313 extern int ext4_can_truncate(struct inode *inode); 2314 extern void ext4_truncate(struct inode *); 2315 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2316 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 2317 extern void ext4_set_inode_flags(struct inode *); 2318 extern void ext4_get_inode_flags(struct ext4_inode_info *); 2319 extern int ext4_alloc_da_blocks(struct inode *inode); 2320 extern void ext4_set_aops(struct inode *inode); 2321 extern int ext4_writepage_trans_blocks(struct inode *); 2322 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2323 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2324 loff_t lstart, loff_t lend); 2325 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 2326 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2327 extern void ext4_da_update_reserve_space(struct inode *inode, 2328 int used, int quota_claim); 2329 2330 /* indirect.c */ 2331 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2332 struct ext4_map_blocks *map, int flags); 2333 extern ssize_t ext4_ind_direct_IO(struct kiocb *iocb, struct iov_iter *iter, 2334 loff_t offset); 2335 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2336 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2337 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2338 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2339 ext4_lblk_t start, ext4_lblk_t end); 2340 2341 /* ioctl.c */ 2342 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2343 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2344 2345 /* migrate.c */ 2346 extern int ext4_ext_migrate(struct inode *); 2347 extern int ext4_ind_migrate(struct inode *inode); 2348 2349 /* namei.c */ 2350 extern int ext4_dirent_csum_verify(struct inode *inode, 2351 struct ext4_dir_entry *dirent); 2352 extern int ext4_orphan_add(handle_t *, struct inode *); 2353 extern int ext4_orphan_del(handle_t *, struct inode *); 2354 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2355 __u32 start_minor_hash, __u32 *next_hash); 2356 extern int ext4_search_dir(struct buffer_head *bh, 2357 char *search_buf, 2358 int buf_size, 2359 struct inode *dir, 2360 struct ext4_filename *fname, 2361 const struct qstr *d_name, 2362 unsigned int offset, 2363 struct ext4_dir_entry_2 **res_dir); 2364 extern int ext4_generic_delete_entry(handle_t *handle, 2365 struct inode *dir, 2366 struct ext4_dir_entry_2 *de_del, 2367 struct buffer_head *bh, 2368 void *entry_buf, 2369 int buf_size, 2370 int csum_size); 2371 extern int ext4_empty_dir(struct inode *inode); 2372 2373 /* resize.c */ 2374 extern int ext4_group_add(struct super_block *sb, 2375 struct ext4_new_group_data *input); 2376 extern int ext4_group_extend(struct super_block *sb, 2377 struct ext4_super_block *es, 2378 ext4_fsblk_t n_blocks_count); 2379 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2380 2381 /* super.c */ 2382 extern int ext4_calculate_overhead(struct super_block *sb); 2383 extern void ext4_superblock_csum_set(struct super_block *sb); 2384 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 2385 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 2386 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2387 ext4_group_t ngroup); 2388 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2389 char nbuf[16]); 2390 2391 extern __printf(4, 5) 2392 void __ext4_error(struct super_block *, const char *, unsigned int, 2393 const char *, ...); 2394 extern __printf(5, 6) 2395 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2396 const char *, ...); 2397 extern __printf(5, 6) 2398 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2399 const char *, ...); 2400 extern void __ext4_std_error(struct super_block *, const char *, 2401 unsigned int, int); 2402 extern __printf(4, 5) 2403 void __ext4_abort(struct super_block *, const char *, unsigned int, 2404 const char *, ...); 2405 extern __printf(4, 5) 2406 void __ext4_warning(struct super_block *, const char *, unsigned int, 2407 const char *, ...); 2408 extern __printf(3, 4) 2409 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2410 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2411 const char *, unsigned int, const char *); 2412 extern __printf(7, 8) 2413 void __ext4_grp_locked_error(const char *, unsigned int, 2414 struct super_block *, ext4_group_t, 2415 unsigned long, ext4_fsblk_t, 2416 const char *, ...); 2417 2418 #ifdef CONFIG_PRINTK 2419 2420 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2421 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__) 2422 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2423 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2424 #define ext4_error(sb, fmt, ...) \ 2425 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2426 #define ext4_abort(sb, fmt, ...) \ 2427 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2428 #define ext4_warning(sb, fmt, ...) \ 2429 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2430 #define ext4_msg(sb, level, fmt, ...) \ 2431 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 2432 #define dump_mmp_msg(sb, mmp, msg) \ 2433 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 2434 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2435 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 2436 fmt, ##__VA_ARGS__) 2437 2438 #else 2439 2440 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2441 do { \ 2442 no_printk(fmt, ##__VA_ARGS__); \ 2443 __ext4_error_inode(inode, "", 0, block, " "); \ 2444 } while (0) 2445 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2446 do { \ 2447 no_printk(fmt, ##__VA_ARGS__); \ 2448 __ext4_error_file(file, "", 0, block, " "); \ 2449 } while (0) 2450 #define ext4_error(sb, fmt, ...) \ 2451 do { \ 2452 no_printk(fmt, ##__VA_ARGS__); \ 2453 __ext4_error(sb, "", 0, " "); \ 2454 } while (0) 2455 #define ext4_abort(sb, fmt, ...) \ 2456 do { \ 2457 no_printk(fmt, ##__VA_ARGS__); \ 2458 __ext4_abort(sb, "", 0, " "); \ 2459 } while (0) 2460 #define ext4_warning(sb, fmt, ...) \ 2461 do { \ 2462 no_printk(fmt, ##__VA_ARGS__); \ 2463 __ext4_warning(sb, "", 0, " "); \ 2464 } while (0) 2465 #define ext4_msg(sb, level, fmt, ...) \ 2466 do { \ 2467 no_printk(fmt, ##__VA_ARGS__); \ 2468 __ext4_msg(sb, "", " "); \ 2469 } while (0) 2470 #define dump_mmp_msg(sb, mmp, msg) \ 2471 __dump_mmp_msg(sb, mmp, "", 0, "") 2472 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2473 do { \ 2474 no_printk(fmt, ##__VA_ARGS__); \ 2475 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 2476 } while (0) 2477 2478 #endif 2479 2480 extern void ext4_update_dynamic_rev(struct super_block *sb); 2481 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2482 __u32 compat); 2483 extern int ext4_update_rocompat_feature(handle_t *handle, 2484 struct super_block *sb, __u32 rocompat); 2485 extern int ext4_update_incompat_feature(handle_t *handle, 2486 struct super_block *sb, __u32 incompat); 2487 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2488 struct ext4_group_desc *bg); 2489 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2490 struct ext4_group_desc *bg); 2491 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2492 struct ext4_group_desc *bg); 2493 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2494 struct ext4_group_desc *bg); 2495 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2496 struct ext4_group_desc *bg); 2497 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2498 struct ext4_group_desc *bg); 2499 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2500 struct ext4_group_desc *bg); 2501 extern void ext4_block_bitmap_set(struct super_block *sb, 2502 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2503 extern void ext4_inode_bitmap_set(struct super_block *sb, 2504 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2505 extern void ext4_inode_table_set(struct super_block *sb, 2506 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2507 extern void ext4_free_group_clusters_set(struct super_block *sb, 2508 struct ext4_group_desc *bg, 2509 __u32 count); 2510 extern void ext4_free_inodes_set(struct super_block *sb, 2511 struct ext4_group_desc *bg, __u32 count); 2512 extern void ext4_used_dirs_set(struct super_block *sb, 2513 struct ext4_group_desc *bg, __u32 count); 2514 extern void ext4_itable_unused_set(struct super_block *sb, 2515 struct ext4_group_desc *bg, __u32 count); 2516 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2517 struct ext4_group_desc *gdp); 2518 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2519 struct ext4_group_desc *gdp); 2520 extern int ext4_register_li_request(struct super_block *sb, 2521 ext4_group_t first_not_zeroed); 2522 2523 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2524 { 2525 return EXT4_HAS_RO_COMPAT_FEATURE(sb, 2526 EXT4_FEATURE_RO_COMPAT_GDT_CSUM) || 2527 (EXT4_SB(sb)->s_chksum_driver != NULL); 2528 } 2529 2530 static inline int ext4_has_metadata_csum(struct super_block *sb) 2531 { 2532 WARN_ON_ONCE(EXT4_HAS_RO_COMPAT_FEATURE(sb, 2533 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) && 2534 !EXT4_SB(sb)->s_chksum_driver); 2535 2536 return (EXT4_SB(sb)->s_chksum_driver != NULL); 2537 } 2538 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2539 { 2540 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2541 le32_to_cpu(es->s_blocks_count_lo); 2542 } 2543 2544 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2545 { 2546 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2547 le32_to_cpu(es->s_r_blocks_count_lo); 2548 } 2549 2550 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2551 { 2552 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2553 le32_to_cpu(es->s_free_blocks_count_lo); 2554 } 2555 2556 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2557 ext4_fsblk_t blk) 2558 { 2559 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2560 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2561 } 2562 2563 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2564 ext4_fsblk_t blk) 2565 { 2566 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2567 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2568 } 2569 2570 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2571 ext4_fsblk_t blk) 2572 { 2573 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2574 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2575 } 2576 2577 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 2578 { 2579 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2580 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2581 le32_to_cpu(raw_inode->i_size_lo); 2582 else 2583 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2584 } 2585 2586 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2587 { 2588 raw_inode->i_size_lo = cpu_to_le32(i_size); 2589 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2590 } 2591 2592 static inline 2593 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2594 ext4_group_t group) 2595 { 2596 struct ext4_group_info ***grp_info; 2597 long indexv, indexh; 2598 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 2599 grp_info = EXT4_SB(sb)->s_group_info; 2600 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2601 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2602 return grp_info[indexv][indexh]; 2603 } 2604 2605 /* 2606 * Reading s_groups_count requires using smp_rmb() afterwards. See 2607 * the locking protocol documented in the comments of ext4_group_add() 2608 * in resize.c 2609 */ 2610 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2611 { 2612 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2613 2614 smp_rmb(); 2615 return ngroups; 2616 } 2617 2618 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2619 ext4_group_t block_group) 2620 { 2621 return block_group >> sbi->s_log_groups_per_flex; 2622 } 2623 2624 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2625 { 2626 return 1 << sbi->s_log_groups_per_flex; 2627 } 2628 2629 #define ext4_std_error(sb, errno) \ 2630 do { \ 2631 if ((errno)) \ 2632 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2633 } while (0) 2634 2635 #ifdef CONFIG_SMP 2636 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2637 * counters. So we need to make sure we have free clusters more 2638 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2639 */ 2640 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2641 #else 2642 #define EXT4_FREECLUSTERS_WATERMARK 0 2643 #endif 2644 2645 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 2646 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2647 { 2648 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 2649 !mutex_is_locked(&inode->i_mutex)); 2650 down_write(&EXT4_I(inode)->i_data_sem); 2651 if (newsize > EXT4_I(inode)->i_disksize) 2652 EXT4_I(inode)->i_disksize = newsize; 2653 up_write(&EXT4_I(inode)->i_data_sem); 2654 } 2655 2656 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 2657 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 2658 { 2659 int changed = 0; 2660 2661 if (newsize > inode->i_size) { 2662 i_size_write(inode, newsize); 2663 changed = 1; 2664 } 2665 if (newsize > EXT4_I(inode)->i_disksize) { 2666 ext4_update_i_disksize(inode, newsize); 2667 changed |= 2; 2668 } 2669 return changed; 2670 } 2671 2672 struct ext4_group_info { 2673 unsigned long bb_state; 2674 struct rb_root bb_free_root; 2675 ext4_grpblk_t bb_first_free; /* first free block */ 2676 ext4_grpblk_t bb_free; /* total free blocks */ 2677 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 2678 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 2679 struct list_head bb_prealloc_list; 2680 #ifdef DOUBLE_CHECK 2681 void *bb_bitmap; 2682 #endif 2683 struct rw_semaphore alloc_sem; 2684 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2685 * regions, index is order. 2686 * bb_counters[3] = 5 means 2687 * 5 free 8-block regions. */ 2688 }; 2689 2690 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 2691 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 2692 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 2693 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 2694 2695 #define EXT4_MB_GRP_NEED_INIT(grp) \ 2696 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 2697 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 2698 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2699 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 2700 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2701 2702 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 2703 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2704 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 2705 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2706 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 2707 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2708 2709 #define EXT4_MAX_CONTENTION 8 2710 #define EXT4_CONTENTION_THRESHOLD 2 2711 2712 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2713 ext4_group_t group) 2714 { 2715 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2716 } 2717 2718 /* 2719 * Returns true if the filesystem is busy enough that attempts to 2720 * access the block group locks has run into contention. 2721 */ 2722 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 2723 { 2724 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 2725 } 2726 2727 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 2728 { 2729 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 2730 if (spin_trylock(lock)) 2731 /* 2732 * We're able to grab the lock right away, so drop the 2733 * lock contention counter. 2734 */ 2735 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 2736 else { 2737 /* 2738 * The lock is busy, so bump the contention counter, 2739 * and then wait on the spin lock. 2740 */ 2741 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 2742 EXT4_MAX_CONTENTION); 2743 spin_lock(lock); 2744 } 2745 } 2746 2747 static inline void ext4_unlock_group(struct super_block *sb, 2748 ext4_group_t group) 2749 { 2750 spin_unlock(ext4_group_lock_ptr(sb, group)); 2751 } 2752 2753 /* 2754 * Block validity checking 2755 */ 2756 #define ext4_check_indirect_blockref(inode, bh) \ 2757 ext4_check_blockref(__func__, __LINE__, inode, \ 2758 (__le32 *)(bh)->b_data, \ 2759 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 2760 2761 #define ext4_ind_check_inode(inode) \ 2762 ext4_check_blockref(__func__, __LINE__, inode, \ 2763 EXT4_I(inode)->i_data, \ 2764 EXT4_NDIR_BLOCKS) 2765 2766 /* 2767 * Inodes and files operations 2768 */ 2769 2770 /* dir.c */ 2771 extern const struct file_operations ext4_dir_operations; 2772 2773 /* file.c */ 2774 extern const struct inode_operations ext4_file_inode_operations; 2775 extern const struct file_operations ext4_file_operations; 2776 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 2777 2778 /* inline.c */ 2779 extern int ext4_get_max_inline_size(struct inode *inode); 2780 extern int ext4_find_inline_data_nolock(struct inode *inode); 2781 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 2782 unsigned int len); 2783 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 2784 2785 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 2786 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 2787 struct inode *inode, 2788 loff_t pos, unsigned len, 2789 unsigned flags, 2790 struct page **pagep); 2791 extern int ext4_write_inline_data_end(struct inode *inode, 2792 loff_t pos, unsigned len, 2793 unsigned copied, 2794 struct page *page); 2795 extern struct buffer_head * 2796 ext4_journalled_write_inline_data(struct inode *inode, 2797 unsigned len, 2798 struct page *page); 2799 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 2800 struct inode *inode, 2801 loff_t pos, unsigned len, 2802 unsigned flags, 2803 struct page **pagep, 2804 void **fsdata); 2805 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 2806 unsigned len, unsigned copied, 2807 struct page *page); 2808 extern int ext4_try_add_inline_entry(handle_t *handle, 2809 struct ext4_filename *fname, 2810 struct dentry *dentry, 2811 struct inode *inode); 2812 extern int ext4_try_create_inline_dir(handle_t *handle, 2813 struct inode *parent, 2814 struct inode *inode); 2815 extern int ext4_read_inline_dir(struct file *filp, 2816 struct dir_context *ctx, 2817 int *has_inline_data); 2818 extern int htree_inlinedir_to_tree(struct file *dir_file, 2819 struct inode *dir, ext4_lblk_t block, 2820 struct dx_hash_info *hinfo, 2821 __u32 start_hash, __u32 start_minor_hash, 2822 int *has_inline_data); 2823 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 2824 struct ext4_filename *fname, 2825 const struct qstr *d_name, 2826 struct ext4_dir_entry_2 **res_dir, 2827 int *has_inline_data); 2828 extern int ext4_delete_inline_entry(handle_t *handle, 2829 struct inode *dir, 2830 struct ext4_dir_entry_2 *de_del, 2831 struct buffer_head *bh, 2832 int *has_inline_data); 2833 extern int empty_inline_dir(struct inode *dir, int *has_inline_data); 2834 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 2835 struct ext4_dir_entry_2 **parent_de, 2836 int *retval); 2837 extern int ext4_inline_data_fiemap(struct inode *inode, 2838 struct fiemap_extent_info *fieinfo, 2839 int *has_inline, __u64 start, __u64 len); 2840 extern int ext4_try_to_evict_inline_data(handle_t *handle, 2841 struct inode *inode, 2842 int needed); 2843 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline); 2844 2845 extern int ext4_convert_inline_data(struct inode *inode); 2846 2847 static inline int ext4_has_inline_data(struct inode *inode) 2848 { 2849 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 2850 EXT4_I(inode)->i_inline_off; 2851 } 2852 2853 /* namei.c */ 2854 extern const struct inode_operations ext4_dir_inode_operations; 2855 extern const struct inode_operations ext4_special_inode_operations; 2856 extern struct dentry *ext4_get_parent(struct dentry *child); 2857 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 2858 struct ext4_dir_entry_2 *de, 2859 int blocksize, int csum_size, 2860 unsigned int parent_ino, int dotdot_real_len); 2861 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t, 2862 unsigned int blocksize); 2863 extern int ext4_handle_dirty_dirent_node(handle_t *handle, 2864 struct inode *inode, 2865 struct buffer_head *bh); 2866 #define S_SHIFT 12 2867 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = { 2868 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 2869 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 2870 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 2871 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 2872 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 2873 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 2874 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 2875 }; 2876 2877 static inline void ext4_set_de_type(struct super_block *sb, 2878 struct ext4_dir_entry_2 *de, 2879 umode_t mode) { 2880 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE)) 2881 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 2882 } 2883 2884 /* readpages.c */ 2885 extern int ext4_mpage_readpages(struct address_space *mapping, 2886 struct list_head *pages, struct page *page, 2887 unsigned nr_pages); 2888 2889 /* symlink.c */ 2890 extern const struct inode_operations ext4_symlink_inode_operations; 2891 extern const struct inode_operations ext4_fast_symlink_inode_operations; 2892 2893 /* block_validity */ 2894 extern void ext4_release_system_zone(struct super_block *sb); 2895 extern int ext4_setup_system_zone(struct super_block *sb); 2896 extern int __init ext4_init_system_zone(void); 2897 extern void ext4_exit_system_zone(void); 2898 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 2899 ext4_fsblk_t start_blk, 2900 unsigned int count); 2901 extern int ext4_check_blockref(const char *, unsigned int, 2902 struct inode *, __le32 *, unsigned int); 2903 2904 /* extents.c */ 2905 struct ext4_ext_path; 2906 struct ext4_extent; 2907 2908 /* 2909 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 2910 * __le32. 2911 */ 2912 #define EXT_MAX_BLOCKS 0xffffffff 2913 2914 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 2915 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 2916 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 2917 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 2918 struct ext4_map_blocks *map, int flags); 2919 extern void ext4_ext_truncate(handle_t *, struct inode *); 2920 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 2921 ext4_lblk_t end); 2922 extern void ext4_ext_init(struct super_block *); 2923 extern void ext4_ext_release(struct super_block *); 2924 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 2925 loff_t len); 2926 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 2927 loff_t offset, ssize_t len); 2928 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 2929 struct ext4_map_blocks *map, int flags); 2930 extern int ext4_ext_calc_metadata_amount(struct inode *inode, 2931 ext4_lblk_t lblocks); 2932 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 2933 int num, 2934 struct ext4_ext_path *path); 2935 extern int ext4_can_extents_be_merged(struct inode *inode, 2936 struct ext4_extent *ex1, 2937 struct ext4_extent *ex2); 2938 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 2939 struct ext4_ext_path **, 2940 struct ext4_extent *, int); 2941 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 2942 struct ext4_ext_path **, 2943 int flags); 2944 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 2945 extern int ext4_ext_check_inode(struct inode *inode); 2946 extern int ext4_find_delalloc_range(struct inode *inode, 2947 ext4_lblk_t lblk_start, 2948 ext4_lblk_t lblk_end); 2949 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk); 2950 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 2951 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2952 __u64 start, __u64 len); 2953 extern int ext4_ext_precache(struct inode *inode); 2954 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len); 2955 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len); 2956 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 2957 struct inode *inode2, ext4_lblk_t lblk1, 2958 ext4_lblk_t lblk2, ext4_lblk_t count, 2959 int mark_unwritten,int *err); 2960 2961 /* move_extent.c */ 2962 extern void ext4_double_down_write_data_sem(struct inode *first, 2963 struct inode *second); 2964 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 2965 struct inode *donor_inode); 2966 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 2967 __u64 start_orig, __u64 start_donor, 2968 __u64 len, __u64 *moved_len); 2969 2970 /* page-io.c */ 2971 extern int __init ext4_init_pageio(void); 2972 extern void ext4_exit_pageio(void); 2973 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 2974 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 2975 extern int ext4_put_io_end(ext4_io_end_t *io_end); 2976 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 2977 extern void ext4_io_submit_init(struct ext4_io_submit *io, 2978 struct writeback_control *wbc); 2979 extern void ext4_end_io_rsv_work(struct work_struct *work); 2980 extern void ext4_io_submit(struct ext4_io_submit *io); 2981 extern int ext4_bio_write_page(struct ext4_io_submit *io, 2982 struct page *page, 2983 int len, 2984 struct writeback_control *wbc, 2985 bool keep_towrite); 2986 2987 /* mmp.c */ 2988 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 2989 2990 /* 2991 * Add new method to test whether block and inode bitmaps are properly 2992 * initialized. With uninit_bg reading the block from disk is not enough 2993 * to mark the bitmap uptodate. We need to also zero-out the bitmap 2994 */ 2995 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 2996 2997 static inline int bitmap_uptodate(struct buffer_head *bh) 2998 { 2999 return (buffer_uptodate(bh) && 3000 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3001 } 3002 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3003 { 3004 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3005 } 3006 3007 /* 3008 * Disable DIO read nolock optimization, so new dioreaders will be forced 3009 * to grab i_mutex 3010 */ 3011 static inline void ext4_inode_block_unlocked_dio(struct inode *inode) 3012 { 3013 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 3014 smp_mb(); 3015 } 3016 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode) 3017 { 3018 smp_mb(); 3019 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 3020 } 3021 3022 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3023 3024 /* For ioend & aio unwritten conversion wait queues */ 3025 #define EXT4_WQ_HASH_SZ 37 3026 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3027 EXT4_WQ_HASH_SZ]) 3028 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\ 3029 EXT4_WQ_HASH_SZ]) 3030 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3031 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; 3032 3033 #define EXT4_RESIZING 0 3034 extern int ext4_resize_begin(struct super_block *sb); 3035 extern void ext4_resize_end(struct super_block *sb); 3036 3037 #endif /* __KERNEL__ */ 3038 3039 #endif /* _EXT4_H */ 3040