1 /* 2 * ext4.h 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/include/linux/minix_fs.h 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 */ 15 16 #ifndef _EXT4_H 17 #define _EXT4_H 18 19 #include <linux/types.h> 20 #include <linux/blkdev.h> 21 #include <linux/magic.h> 22 #include <linux/jbd2.h> 23 #include <linux/quota.h> 24 #include <linux/rwsem.h> 25 #include <linux/rbtree.h> 26 #include <linux/seqlock.h> 27 #include <linux/mutex.h> 28 #include <linux/timer.h> 29 #include <linux/wait.h> 30 #include <linux/blockgroup_lock.h> 31 #include <linux/percpu_counter.h> 32 #include <linux/ratelimit.h> 33 #include <crypto/hash.h> 34 #include <linux/falloc.h> 35 #ifdef __KERNEL__ 36 #include <linux/compat.h> 37 #endif 38 39 /* 40 * The fourth extended filesystem constants/structures 41 */ 42 43 /* 44 * Define EXT4FS_DEBUG to produce debug messages 45 */ 46 #undef EXT4FS_DEBUG 47 48 /* 49 * Debug code 50 */ 51 #ifdef EXT4FS_DEBUG 52 #define ext4_debug(f, a...) \ 53 do { \ 54 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 55 __FILE__, __LINE__, __func__); \ 56 printk(KERN_DEBUG f, ## a); \ 57 } while (0) 58 #else 59 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 60 #endif 61 62 /* 63 * Turn on EXT_DEBUG to get lots of info about extents operations. 64 */ 65 #define EXT_DEBUG__ 66 #ifdef EXT_DEBUG 67 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__) 68 #else 69 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 70 #endif 71 72 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 73 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 74 75 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 76 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 77 78 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 79 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 80 81 /* data type for block offset of block group */ 82 typedef int ext4_grpblk_t; 83 84 /* data type for filesystem-wide blocks number */ 85 typedef unsigned long long ext4_fsblk_t; 86 87 /* data type for file logical block number */ 88 typedef __u32 ext4_lblk_t; 89 90 /* data type for block group number */ 91 typedef unsigned int ext4_group_t; 92 93 /* 94 * Flags used in mballoc's allocation_context flags field. 95 * 96 * Also used to show what's going on for debugging purposes when the 97 * flag field is exported via the traceport interface 98 */ 99 100 /* prefer goal again. length */ 101 #define EXT4_MB_HINT_MERGE 0x0001 102 /* blocks already reserved */ 103 #define EXT4_MB_HINT_RESERVED 0x0002 104 /* metadata is being allocated */ 105 #define EXT4_MB_HINT_METADATA 0x0004 106 /* first blocks in the file */ 107 #define EXT4_MB_HINT_FIRST 0x0008 108 /* search for the best chunk */ 109 #define EXT4_MB_HINT_BEST 0x0010 110 /* data is being allocated */ 111 #define EXT4_MB_HINT_DATA 0x0020 112 /* don't preallocate (for tails) */ 113 #define EXT4_MB_HINT_NOPREALLOC 0x0040 114 /* allocate for locality group */ 115 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 116 /* allocate goal blocks or none */ 117 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 118 /* goal is meaningful */ 119 #define EXT4_MB_HINT_TRY_GOAL 0x0200 120 /* blocks already pre-reserved by delayed allocation */ 121 #define EXT4_MB_DELALLOC_RESERVED 0x0400 122 /* We are doing stream allocation */ 123 #define EXT4_MB_STREAM_ALLOC 0x0800 124 /* Use reserved root blocks if needed */ 125 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 126 /* Use blocks from reserved pool */ 127 #define EXT4_MB_USE_RESERVED 0x2000 128 129 struct ext4_allocation_request { 130 /* target inode for block we're allocating */ 131 struct inode *inode; 132 /* how many blocks we want to allocate */ 133 unsigned int len; 134 /* logical block in target inode */ 135 ext4_lblk_t logical; 136 /* the closest logical allocated block to the left */ 137 ext4_lblk_t lleft; 138 /* the closest logical allocated block to the right */ 139 ext4_lblk_t lright; 140 /* phys. target (a hint) */ 141 ext4_fsblk_t goal; 142 /* phys. block for the closest logical allocated block to the left */ 143 ext4_fsblk_t pleft; 144 /* phys. block for the closest logical allocated block to the right */ 145 ext4_fsblk_t pright; 146 /* flags. see above EXT4_MB_HINT_* */ 147 unsigned int flags; 148 }; 149 150 /* 151 * Logical to physical block mapping, used by ext4_map_blocks() 152 * 153 * This structure is used to pass requests into ext4_map_blocks() as 154 * well as to store the information returned by ext4_map_blocks(). It 155 * takes less room on the stack than a struct buffer_head. 156 */ 157 #define EXT4_MAP_NEW (1 << BH_New) 158 #define EXT4_MAP_MAPPED (1 << BH_Mapped) 159 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 160 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 161 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 162 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 163 164 struct ext4_map_blocks { 165 ext4_fsblk_t m_pblk; 166 ext4_lblk_t m_lblk; 167 unsigned int m_len; 168 unsigned int m_flags; 169 }; 170 171 /* 172 * Flags for ext4_io_end->flags 173 */ 174 #define EXT4_IO_END_UNWRITTEN 0x0001 175 176 /* 177 * For converting unwritten extents on a work queue. 'handle' is used for 178 * buffered writeback. 179 */ 180 typedef struct ext4_io_end { 181 struct list_head list; /* per-file finished IO list */ 182 handle_t *handle; /* handle reserved for extent 183 * conversion */ 184 struct inode *inode; /* file being written to */ 185 struct bio *bio; /* Linked list of completed 186 * bios covering the extent */ 187 unsigned int flag; /* unwritten or not */ 188 loff_t offset; /* offset in the file */ 189 ssize_t size; /* size of the extent */ 190 atomic_t count; /* reference counter */ 191 } ext4_io_end_t; 192 193 struct ext4_io_submit { 194 int io_op; 195 struct bio *io_bio; 196 ext4_io_end_t *io_end; 197 sector_t io_next_block; 198 }; 199 200 /* 201 * Special inodes numbers 202 */ 203 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 204 #define EXT4_ROOT_INO 2 /* Root inode */ 205 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 206 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 207 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 208 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 209 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 210 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 211 212 /* First non-reserved inode for old ext4 filesystems */ 213 #define EXT4_GOOD_OLD_FIRST_INO 11 214 215 /* 216 * Maximal count of links to a file 217 */ 218 #define EXT4_LINK_MAX 65000 219 220 /* 221 * Macro-instructions used to manage several block sizes 222 */ 223 #define EXT4_MIN_BLOCK_SIZE 1024 224 #define EXT4_MAX_BLOCK_SIZE 65536 225 #define EXT4_MIN_BLOCK_LOG_SIZE 10 226 #define EXT4_MAX_BLOCK_LOG_SIZE 16 227 #ifdef __KERNEL__ 228 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 229 #else 230 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 231 #endif 232 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 233 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 234 EXT4_SB(s)->s_cluster_bits) 235 #ifdef __KERNEL__ 236 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 237 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 238 #else 239 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 240 #endif 241 #ifdef __KERNEL__ 242 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 243 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 244 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 245 #else 246 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 247 EXT4_GOOD_OLD_INODE_SIZE : \ 248 (s)->s_inode_size) 249 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 250 EXT4_GOOD_OLD_FIRST_INO : \ 251 (s)->s_first_ino) 252 #endif 253 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 254 255 /* Translate a block number to a cluster number */ 256 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 257 /* Translate a cluster number to a block number */ 258 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 259 /* Translate # of blks to # of clusters */ 260 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 261 (sbi)->s_cluster_bits) 262 /* Mask out the low bits to get the starting block of the cluster */ 263 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 264 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 265 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 266 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 267 /* Get the cluster offset */ 268 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 269 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 270 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 271 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 272 273 /* 274 * Structure of a blocks group descriptor 275 */ 276 struct ext4_group_desc 277 { 278 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 279 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 280 __le32 bg_inode_table_lo; /* Inodes table block */ 281 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 282 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 283 __le16 bg_used_dirs_count_lo; /* Directories count */ 284 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 285 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 286 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 287 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 288 __le16 bg_itable_unused_lo; /* Unused inodes count */ 289 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 290 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 291 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 292 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 293 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 294 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 295 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 296 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 297 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 298 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 299 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 300 __u32 bg_reserved; 301 }; 302 303 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 304 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 305 sizeof(__le16)) 306 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 307 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 308 sizeof(__le16)) 309 310 /* 311 * Structure of a flex block group info 312 */ 313 314 struct flex_groups { 315 atomic64_t free_clusters; 316 atomic_t free_inodes; 317 atomic_t used_dirs; 318 }; 319 320 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 321 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 322 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 323 324 /* 325 * Macro-instructions used to manage group descriptors 326 */ 327 #define EXT4_MIN_DESC_SIZE 32 328 #define EXT4_MIN_DESC_SIZE_64BIT 64 329 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 330 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 331 #ifdef __KERNEL__ 332 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 333 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 334 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 335 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 336 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 337 #else 338 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 339 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 340 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 341 #endif 342 343 /* 344 * Constants relative to the data blocks 345 */ 346 #define EXT4_NDIR_BLOCKS 12 347 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 348 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 349 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 350 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 351 352 /* 353 * Inode flags 354 */ 355 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 356 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 357 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 358 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 359 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 360 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 361 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 362 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 363 /* Reserved for compression usage... */ 364 #define EXT4_DIRTY_FL 0x00000100 365 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 366 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 367 /* nb: was previously EXT2_ECOMPR_FL */ 368 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 369 /* End compression flags --- maybe not all used */ 370 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 371 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 372 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 373 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 374 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 375 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 376 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 377 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 378 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 379 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 380 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 381 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 382 383 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 384 #define EXT4_FL_USER_MODIFIABLE 0x004380FF /* User modifiable flags */ 385 386 /* Flags that should be inherited by new inodes from their parent. */ 387 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 388 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 389 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 390 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 391 392 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 393 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 394 395 /* Flags that are appropriate for non-directories/regular files. */ 396 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 397 398 /* Mask out flags that are inappropriate for the given type of inode. */ 399 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 400 { 401 if (S_ISDIR(mode)) 402 return flags; 403 else if (S_ISREG(mode)) 404 return flags & EXT4_REG_FLMASK; 405 else 406 return flags & EXT4_OTHER_FLMASK; 407 } 408 409 /* 410 * Inode flags used for atomic set/get 411 */ 412 enum { 413 EXT4_INODE_SECRM = 0, /* Secure deletion */ 414 EXT4_INODE_UNRM = 1, /* Undelete */ 415 EXT4_INODE_COMPR = 2, /* Compress file */ 416 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 417 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 418 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 419 EXT4_INODE_NODUMP = 6, /* do not dump file */ 420 EXT4_INODE_NOATIME = 7, /* do not update atime */ 421 /* Reserved for compression usage... */ 422 EXT4_INODE_DIRTY = 8, 423 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 424 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 425 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 426 /* End compression flags --- maybe not all used */ 427 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 428 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 429 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 430 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 431 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 432 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 433 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 434 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 435 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 436 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 437 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 438 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 439 }; 440 441 /* 442 * Since it's pretty easy to mix up bit numbers and hex values, we use a 443 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 444 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 445 * any extra space in the compiled kernel image, otherwise, the build will fail. 446 * It's important that these values are the same, since we are using 447 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 448 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 449 * values found in ext2, ext3 and ext4 filesystems, and of course the values 450 * defined in e2fsprogs. 451 * 452 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 453 */ 454 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 455 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 456 457 static inline void ext4_check_flag_values(void) 458 { 459 CHECK_FLAG_VALUE(SECRM); 460 CHECK_FLAG_VALUE(UNRM); 461 CHECK_FLAG_VALUE(COMPR); 462 CHECK_FLAG_VALUE(SYNC); 463 CHECK_FLAG_VALUE(IMMUTABLE); 464 CHECK_FLAG_VALUE(APPEND); 465 CHECK_FLAG_VALUE(NODUMP); 466 CHECK_FLAG_VALUE(NOATIME); 467 CHECK_FLAG_VALUE(DIRTY); 468 CHECK_FLAG_VALUE(COMPRBLK); 469 CHECK_FLAG_VALUE(NOCOMPR); 470 CHECK_FLAG_VALUE(ENCRYPT); 471 CHECK_FLAG_VALUE(INDEX); 472 CHECK_FLAG_VALUE(IMAGIC); 473 CHECK_FLAG_VALUE(JOURNAL_DATA); 474 CHECK_FLAG_VALUE(NOTAIL); 475 CHECK_FLAG_VALUE(DIRSYNC); 476 CHECK_FLAG_VALUE(TOPDIR); 477 CHECK_FLAG_VALUE(HUGE_FILE); 478 CHECK_FLAG_VALUE(EXTENTS); 479 CHECK_FLAG_VALUE(EA_INODE); 480 CHECK_FLAG_VALUE(EOFBLOCKS); 481 CHECK_FLAG_VALUE(INLINE_DATA); 482 CHECK_FLAG_VALUE(RESERVED); 483 } 484 485 /* Used to pass group descriptor data when online resize is done */ 486 struct ext4_new_group_input { 487 __u32 group; /* Group number for this data */ 488 __u64 block_bitmap; /* Absolute block number of block bitmap */ 489 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 490 __u64 inode_table; /* Absolute block number of inode table start */ 491 __u32 blocks_count; /* Total number of blocks in this group */ 492 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 493 __u16 unused; 494 }; 495 496 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 497 struct compat_ext4_new_group_input { 498 u32 group; 499 compat_u64 block_bitmap; 500 compat_u64 inode_bitmap; 501 compat_u64 inode_table; 502 u32 blocks_count; 503 u16 reserved_blocks; 504 u16 unused; 505 }; 506 #endif 507 508 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 509 struct ext4_new_group_data { 510 __u32 group; 511 __u64 block_bitmap; 512 __u64 inode_bitmap; 513 __u64 inode_table; 514 __u32 blocks_count; 515 __u16 reserved_blocks; 516 __u16 unused; 517 __u32 free_blocks_count; 518 }; 519 520 /* Indexes used to index group tables in ext4_new_group_data */ 521 enum { 522 BLOCK_BITMAP = 0, /* block bitmap */ 523 INODE_BITMAP, /* inode bitmap */ 524 INODE_TABLE, /* inode tables */ 525 GROUP_TABLE_COUNT, 526 }; 527 528 /* 529 * Flags used by ext4_map_blocks() 530 */ 531 /* Allocate any needed blocks and/or convert an unwritten 532 extent to be an initialized ext4 */ 533 #define EXT4_GET_BLOCKS_CREATE 0x0001 534 /* Request the creation of an unwritten extent */ 535 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 536 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 537 EXT4_GET_BLOCKS_CREATE) 538 /* Caller is from the delayed allocation writeout path 539 * finally doing the actual allocation of delayed blocks */ 540 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 541 /* caller is from the direct IO path, request to creation of an 542 unwritten extents if not allocated, split the unwritten 543 extent if blocks has been preallocated already*/ 544 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 545 #define EXT4_GET_BLOCKS_CONVERT 0x0010 546 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 547 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 548 /* Convert extent to initialized after IO complete */ 549 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 550 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 551 /* Eventual metadata allocation (due to growing extent tree) 552 * should not fail, so try to use reserved blocks for that.*/ 553 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 554 /* Don't normalize allocation size (used for fallocate) */ 555 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 556 /* Request will not result in inode size update (user for fallocate) */ 557 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 558 /* Do not take i_data_sem locking in ext4_map_blocks */ 559 #define EXT4_GET_BLOCKS_NO_LOCK 0x0100 560 /* Convert written extents to unwritten */ 561 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0200 562 563 /* 564 * The bit position of these flags must not overlap with any of the 565 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 566 * read_extent_tree_block(), ext4_split_extent_at(), 567 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 568 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 569 * caching the extents when reading from the extent tree while a 570 * truncate or punch hole operation is in progress. 571 */ 572 #define EXT4_EX_NOCACHE 0x40000000 573 #define EXT4_EX_FORCE_CACHE 0x20000000 574 575 /* 576 * Flags used by ext4_free_blocks 577 */ 578 #define EXT4_FREE_BLOCKS_METADATA 0x0001 579 #define EXT4_FREE_BLOCKS_FORGET 0x0002 580 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 581 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 582 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 583 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 584 585 /* Encryption algorithms */ 586 #define EXT4_ENCRYPTION_MODE_INVALID 0 587 #define EXT4_ENCRYPTION_MODE_AES_256_XTS 1 588 #define EXT4_ENCRYPTION_MODE_AES_256_GCM 2 589 #define EXT4_ENCRYPTION_MODE_AES_256_CBC 3 590 #define EXT4_ENCRYPTION_MODE_AES_256_CTS 4 591 592 #include "ext4_crypto.h" 593 594 /* 595 * ioctl commands 596 */ 597 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 598 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 599 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 600 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 601 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 602 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 603 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 604 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 605 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 606 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 607 #define EXT4_IOC_MIGRATE _IO('f', 9) 608 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 609 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 610 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 611 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 612 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 613 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 614 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 615 #define EXT4_IOC_SET_ENCRYPTION_POLICY _IOR('f', 19, struct ext4_encryption_policy) 616 #define EXT4_IOC_GET_ENCRYPTION_PWSALT _IOW('f', 20, __u8[16]) 617 #define EXT4_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct ext4_encryption_policy) 618 619 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 620 /* 621 * ioctl commands in 32 bit emulation 622 */ 623 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 624 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 625 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 626 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 627 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 628 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 629 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 630 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 631 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 632 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 633 #endif 634 635 /* Max physical block we can address w/o extents */ 636 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 637 638 /* 639 * Structure of an inode on the disk 640 */ 641 struct ext4_inode { 642 __le16 i_mode; /* File mode */ 643 __le16 i_uid; /* Low 16 bits of Owner Uid */ 644 __le32 i_size_lo; /* Size in bytes */ 645 __le32 i_atime; /* Access time */ 646 __le32 i_ctime; /* Inode Change time */ 647 __le32 i_mtime; /* Modification time */ 648 __le32 i_dtime; /* Deletion Time */ 649 __le16 i_gid; /* Low 16 bits of Group Id */ 650 __le16 i_links_count; /* Links count */ 651 __le32 i_blocks_lo; /* Blocks count */ 652 __le32 i_flags; /* File flags */ 653 union { 654 struct { 655 __le32 l_i_version; 656 } linux1; 657 struct { 658 __u32 h_i_translator; 659 } hurd1; 660 struct { 661 __u32 m_i_reserved1; 662 } masix1; 663 } osd1; /* OS dependent 1 */ 664 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 665 __le32 i_generation; /* File version (for NFS) */ 666 __le32 i_file_acl_lo; /* File ACL */ 667 __le32 i_size_high; 668 __le32 i_obso_faddr; /* Obsoleted fragment address */ 669 union { 670 struct { 671 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 672 __le16 l_i_file_acl_high; 673 __le16 l_i_uid_high; /* these 2 fields */ 674 __le16 l_i_gid_high; /* were reserved2[0] */ 675 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 676 __le16 l_i_reserved; 677 } linux2; 678 struct { 679 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 680 __u16 h_i_mode_high; 681 __u16 h_i_uid_high; 682 __u16 h_i_gid_high; 683 __u32 h_i_author; 684 } hurd2; 685 struct { 686 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 687 __le16 m_i_file_acl_high; 688 __u32 m_i_reserved2[2]; 689 } masix2; 690 } osd2; /* OS dependent 2 */ 691 __le16 i_extra_isize; 692 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 693 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 694 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 695 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 696 __le32 i_crtime; /* File Creation time */ 697 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 698 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 699 }; 700 701 struct move_extent { 702 __u32 reserved; /* should be zero */ 703 __u32 donor_fd; /* donor file descriptor */ 704 __u64 orig_start; /* logical start offset in block for orig */ 705 __u64 donor_start; /* logical start offset in block for donor */ 706 __u64 len; /* block length to be moved */ 707 __u64 moved_len; /* moved block length */ 708 }; 709 710 #define EXT4_EPOCH_BITS 2 711 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 712 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 713 714 /* 715 * Extended fields will fit into an inode if the filesystem was formatted 716 * with large inodes (-I 256 or larger) and there are not currently any EAs 717 * consuming all of the available space. For new inodes we always reserve 718 * enough space for the kernel's known extended fields, but for inodes 719 * created with an old kernel this might not have been the case. None of 720 * the extended inode fields is critical for correct filesystem operation. 721 * This macro checks if a certain field fits in the inode. Note that 722 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 723 */ 724 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 725 ((offsetof(typeof(*ext4_inode), field) + \ 726 sizeof((ext4_inode)->field)) \ 727 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 728 (einode)->i_extra_isize)) \ 729 730 static inline __le32 ext4_encode_extra_time(struct timespec *time) 731 { 732 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 733 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | 734 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); 735 } 736 737 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 738 { 739 if (sizeof(time->tv_sec) > 4) 740 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 741 << 32; 742 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 743 } 744 745 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 746 do { \ 747 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 748 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 749 (raw_inode)->xtime ## _extra = \ 750 ext4_encode_extra_time(&(inode)->xtime); \ 751 } while (0) 752 753 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 754 do { \ 755 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 756 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 757 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 758 (raw_inode)->xtime ## _extra = \ 759 ext4_encode_extra_time(&(einode)->xtime); \ 760 } while (0) 761 762 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 763 do { \ 764 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 765 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 766 ext4_decode_extra_time(&(inode)->xtime, \ 767 raw_inode->xtime ## _extra); \ 768 else \ 769 (inode)->xtime.tv_nsec = 0; \ 770 } while (0) 771 772 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 773 do { \ 774 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 775 (einode)->xtime.tv_sec = \ 776 (signed)le32_to_cpu((raw_inode)->xtime); \ 777 else \ 778 (einode)->xtime.tv_sec = 0; \ 779 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 780 ext4_decode_extra_time(&(einode)->xtime, \ 781 raw_inode->xtime ## _extra); \ 782 else \ 783 (einode)->xtime.tv_nsec = 0; \ 784 } while (0) 785 786 #define i_disk_version osd1.linux1.l_i_version 787 788 #if defined(__KERNEL__) || defined(__linux__) 789 #define i_reserved1 osd1.linux1.l_i_reserved1 790 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 791 #define i_blocks_high osd2.linux2.l_i_blocks_high 792 #define i_uid_low i_uid 793 #define i_gid_low i_gid 794 #define i_uid_high osd2.linux2.l_i_uid_high 795 #define i_gid_high osd2.linux2.l_i_gid_high 796 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 797 798 #elif defined(__GNU__) 799 800 #define i_translator osd1.hurd1.h_i_translator 801 #define i_uid_high osd2.hurd2.h_i_uid_high 802 #define i_gid_high osd2.hurd2.h_i_gid_high 803 #define i_author osd2.hurd2.h_i_author 804 805 #elif defined(__masix__) 806 807 #define i_reserved1 osd1.masix1.m_i_reserved1 808 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 809 #define i_reserved2 osd2.masix2.m_i_reserved2 810 811 #endif /* defined(__KERNEL__) || defined(__linux__) */ 812 813 #include "extents_status.h" 814 815 /* 816 * fourth extended file system inode data in memory 817 */ 818 struct ext4_inode_info { 819 __le32 i_data[15]; /* unconverted */ 820 __u32 i_dtime; 821 ext4_fsblk_t i_file_acl; 822 823 /* 824 * i_block_group is the number of the block group which contains 825 * this file's inode. Constant across the lifetime of the inode, 826 * it is ued for making block allocation decisions - we try to 827 * place a file's data blocks near its inode block, and new inodes 828 * near to their parent directory's inode. 829 */ 830 ext4_group_t i_block_group; 831 ext4_lblk_t i_dir_start_lookup; 832 #if (BITS_PER_LONG < 64) 833 unsigned long i_state_flags; /* Dynamic state flags */ 834 #endif 835 unsigned long i_flags; 836 837 /* 838 * Extended attributes can be read independently of the main file 839 * data. Taking i_mutex even when reading would cause contention 840 * between readers of EAs and writers of regular file data, so 841 * instead we synchronize on xattr_sem when reading or changing 842 * EAs. 843 */ 844 struct rw_semaphore xattr_sem; 845 846 struct list_head i_orphan; /* unlinked but open inodes */ 847 848 /* 849 * i_disksize keeps track of what the inode size is ON DISK, not 850 * in memory. During truncate, i_size is set to the new size by 851 * the VFS prior to calling ext4_truncate(), but the filesystem won't 852 * set i_disksize to 0 until the truncate is actually under way. 853 * 854 * The intent is that i_disksize always represents the blocks which 855 * are used by this file. This allows recovery to restart truncate 856 * on orphans if we crash during truncate. We actually write i_disksize 857 * into the on-disk inode when writing inodes out, instead of i_size. 858 * 859 * The only time when i_disksize and i_size may be different is when 860 * a truncate is in progress. The only things which change i_disksize 861 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 862 */ 863 loff_t i_disksize; 864 865 /* 866 * i_data_sem is for serialising ext4_truncate() against 867 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 868 * data tree are chopped off during truncate. We can't do that in 869 * ext4 because whenever we perform intermediate commits during 870 * truncate, the inode and all the metadata blocks *must* be in a 871 * consistent state which allows truncation of the orphans to restart 872 * during recovery. Hence we must fix the get_block-vs-truncate race 873 * by other means, so we have i_data_sem. 874 */ 875 struct rw_semaphore i_data_sem; 876 struct inode vfs_inode; 877 struct jbd2_inode *jinode; 878 879 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 880 881 /* 882 * File creation time. Its function is same as that of 883 * struct timespec i_{a,c,m}time in the generic inode. 884 */ 885 struct timespec i_crtime; 886 887 /* mballoc */ 888 struct list_head i_prealloc_list; 889 spinlock_t i_prealloc_lock; 890 891 /* extents status tree */ 892 struct ext4_es_tree i_es_tree; 893 rwlock_t i_es_lock; 894 struct list_head i_es_list; 895 unsigned int i_es_all_nr; /* protected by i_es_lock */ 896 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 897 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 898 extents to shrink. Protected by 899 i_es_lock */ 900 901 /* ialloc */ 902 ext4_group_t i_last_alloc_group; 903 904 /* allocation reservation info for delalloc */ 905 /* In case of bigalloc, these refer to clusters rather than blocks */ 906 unsigned int i_reserved_data_blocks; 907 unsigned int i_reserved_meta_blocks; 908 unsigned int i_allocated_meta_blocks; 909 ext4_lblk_t i_da_metadata_calc_last_lblock; 910 int i_da_metadata_calc_len; 911 912 /* on-disk additional length */ 913 __u16 i_extra_isize; 914 915 /* Indicate the inline data space. */ 916 u16 i_inline_off; 917 u16 i_inline_size; 918 919 #ifdef CONFIG_QUOTA 920 /* quota space reservation, managed internally by quota code */ 921 qsize_t i_reserved_quota; 922 #endif 923 924 /* Lock protecting lists below */ 925 spinlock_t i_completed_io_lock; 926 /* 927 * Completed IOs that need unwritten extents handling and have 928 * transaction reserved 929 */ 930 struct list_head i_rsv_conversion_list; 931 /* 932 * Completed IOs that need unwritten extents handling and don't have 933 * transaction reserved 934 */ 935 atomic_t i_ioend_count; /* Number of outstanding io_end structs */ 936 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 937 struct work_struct i_rsv_conversion_work; 938 939 spinlock_t i_block_reservation_lock; 940 941 /* 942 * Transactions that contain inode's metadata needed to complete 943 * fsync and fdatasync, respectively. 944 */ 945 tid_t i_sync_tid; 946 tid_t i_datasync_tid; 947 948 #ifdef CONFIG_QUOTA 949 struct dquot *i_dquot[MAXQUOTAS]; 950 #endif 951 952 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 953 __u32 i_csum_seed; 954 955 #ifdef CONFIG_EXT4_FS_ENCRYPTION 956 /* Encryption params */ 957 struct ext4_encryption_key i_encryption_key; 958 #endif 959 }; 960 961 /* 962 * File system states 963 */ 964 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 965 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 966 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 967 968 /* 969 * Misc. filesystem flags 970 */ 971 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 972 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 973 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 974 975 /* 976 * Mount flags set via mount options or defaults 977 */ 978 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 979 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 980 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 981 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 982 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 983 #define EXT4_MOUNT_ERRORS_MASK 0x00070 984 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 985 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 986 #ifdef CONFIG_FS_DAX 987 #define EXT4_MOUNT_DAX 0x00200 /* Direct Access */ 988 #else 989 #define EXT4_MOUNT_DAX 0 990 #endif 991 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 992 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 993 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 994 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 995 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 996 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 997 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 998 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 999 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1000 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1001 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 1002 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 1003 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 1004 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1005 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1006 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1007 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1008 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1009 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1010 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1011 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1012 1013 /* 1014 * Mount flags set either automatically (could not be set by mount option) 1015 * based on per file system feature or property or in special cases such as 1016 * distinguishing between explicit mount option definition and default. 1017 */ 1018 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1019 specified delalloc */ 1020 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1021 size of blocksize * 8 1022 blocks */ 1023 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1024 file systems */ 1025 1026 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1027 ~EXT4_MOUNT_##opt 1028 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1029 EXT4_MOUNT_##opt 1030 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1031 EXT4_MOUNT_##opt) 1032 1033 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1034 ~EXT4_MOUNT2_##opt 1035 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1036 EXT4_MOUNT2_##opt 1037 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1038 EXT4_MOUNT2_##opt) 1039 1040 #define ext4_test_and_set_bit __test_and_set_bit_le 1041 #define ext4_set_bit __set_bit_le 1042 #define ext4_set_bit_atomic ext2_set_bit_atomic 1043 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1044 #define ext4_clear_bit __clear_bit_le 1045 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1046 #define ext4_test_bit test_bit_le 1047 #define ext4_find_next_zero_bit find_next_zero_bit_le 1048 #define ext4_find_next_bit find_next_bit_le 1049 1050 extern void ext4_set_bits(void *bm, int cur, int len); 1051 1052 /* 1053 * Maximal mount counts between two filesystem checks 1054 */ 1055 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1056 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1057 1058 /* 1059 * Behaviour when detecting errors 1060 */ 1061 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1062 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1063 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1064 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1065 1066 /* Metadata checksum algorithm codes */ 1067 #define EXT4_CRC32C_CHKSUM 1 1068 1069 /* Encryption algorithms */ 1070 #define EXT4_ENCRYPTION_MODE_INVALID 0 1071 #define EXT4_ENCRYPTION_MODE_AES_256_XTS 1 1072 #define EXT4_ENCRYPTION_MODE_AES_256_GCM 2 1073 #define EXT4_ENCRYPTION_MODE_AES_256_CBC 3 1074 1075 /* 1076 * Structure of the super block 1077 */ 1078 struct ext4_super_block { 1079 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1080 __le32 s_blocks_count_lo; /* Blocks count */ 1081 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1082 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1083 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1084 __le32 s_first_data_block; /* First Data Block */ 1085 __le32 s_log_block_size; /* Block size */ 1086 __le32 s_log_cluster_size; /* Allocation cluster size */ 1087 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1088 __le32 s_clusters_per_group; /* # Clusters per group */ 1089 __le32 s_inodes_per_group; /* # Inodes per group */ 1090 __le32 s_mtime; /* Mount time */ 1091 /*30*/ __le32 s_wtime; /* Write time */ 1092 __le16 s_mnt_count; /* Mount count */ 1093 __le16 s_max_mnt_count; /* Maximal mount count */ 1094 __le16 s_magic; /* Magic signature */ 1095 __le16 s_state; /* File system state */ 1096 __le16 s_errors; /* Behaviour when detecting errors */ 1097 __le16 s_minor_rev_level; /* minor revision level */ 1098 /*40*/ __le32 s_lastcheck; /* time of last check */ 1099 __le32 s_checkinterval; /* max. time between checks */ 1100 __le32 s_creator_os; /* OS */ 1101 __le32 s_rev_level; /* Revision level */ 1102 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1103 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1104 /* 1105 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1106 * 1107 * Note: the difference between the compatible feature set and 1108 * the incompatible feature set is that if there is a bit set 1109 * in the incompatible feature set that the kernel doesn't 1110 * know about, it should refuse to mount the filesystem. 1111 * 1112 * e2fsck's requirements are more strict; if it doesn't know 1113 * about a feature in either the compatible or incompatible 1114 * feature set, it must abort and not try to meddle with 1115 * things it doesn't understand... 1116 */ 1117 __le32 s_first_ino; /* First non-reserved inode */ 1118 __le16 s_inode_size; /* size of inode structure */ 1119 __le16 s_block_group_nr; /* block group # of this superblock */ 1120 __le32 s_feature_compat; /* compatible feature set */ 1121 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1122 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1123 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1124 /*78*/ char s_volume_name[16]; /* volume name */ 1125 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 1126 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1127 /* 1128 * Performance hints. Directory preallocation should only 1129 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1130 */ 1131 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1132 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1133 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1134 /* 1135 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1136 */ 1137 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1138 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1139 __le32 s_journal_dev; /* device number of journal file */ 1140 __le32 s_last_orphan; /* start of list of inodes to delete */ 1141 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1142 __u8 s_def_hash_version; /* Default hash version to use */ 1143 __u8 s_jnl_backup_type; 1144 __le16 s_desc_size; /* size of group descriptor */ 1145 /*100*/ __le32 s_default_mount_opts; 1146 __le32 s_first_meta_bg; /* First metablock block group */ 1147 __le32 s_mkfs_time; /* When the filesystem was created */ 1148 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1149 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1150 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1151 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1152 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1153 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1154 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1155 __le32 s_flags; /* Miscellaneous flags */ 1156 __le16 s_raid_stride; /* RAID stride */ 1157 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1158 __le64 s_mmp_block; /* Block for multi-mount protection */ 1159 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1160 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1161 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1162 __u8 s_encryption_level; /* versioning level for encryption */ 1163 __u8 s_reserved_pad; /* Padding to next 32bits */ 1164 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1165 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1166 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1167 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1168 snapshot's future use */ 1169 __le32 s_snapshot_list; /* inode number of the head of the 1170 on-disk snapshot list */ 1171 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1172 __le32 s_error_count; /* number of fs errors */ 1173 __le32 s_first_error_time; /* first time an error happened */ 1174 __le32 s_first_error_ino; /* inode involved in first error */ 1175 __le64 s_first_error_block; /* block involved of first error */ 1176 __u8 s_first_error_func[32]; /* function where the error happened */ 1177 __le32 s_first_error_line; /* line number where error happened */ 1178 __le32 s_last_error_time; /* most recent time of an error */ 1179 __le32 s_last_error_ino; /* inode involved in last error */ 1180 __le32 s_last_error_line; /* line number where error happened */ 1181 __le64 s_last_error_block; /* block involved of last error */ 1182 __u8 s_last_error_func[32]; /* function where the error happened */ 1183 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1184 __u8 s_mount_opts[64]; 1185 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1186 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1187 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1188 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1189 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1190 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1191 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1192 __le32 s_reserved[100]; /* Padding to the end of the block */ 1193 __le32 s_checksum; /* crc32c(superblock) */ 1194 }; 1195 1196 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1197 1198 #ifdef __KERNEL__ 1199 1200 /* 1201 * run-time mount flags 1202 */ 1203 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1204 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1205 1206 /* Number of quota types we support */ 1207 #define EXT4_MAXQUOTAS 2 1208 1209 /* 1210 * fourth extended-fs super-block data in memory 1211 */ 1212 struct ext4_sb_info { 1213 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1214 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1215 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1216 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1217 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1218 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1219 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1220 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1221 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1222 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1223 unsigned long s_overhead; /* # of fs overhead clusters */ 1224 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1225 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1226 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1227 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1228 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1229 struct buffer_head **s_group_desc; 1230 unsigned int s_mount_opt; 1231 unsigned int s_mount_opt2; 1232 unsigned int s_mount_flags; 1233 unsigned int s_def_mount_opt; 1234 ext4_fsblk_t s_sb_block; 1235 atomic64_t s_resv_clusters; 1236 kuid_t s_resuid; 1237 kgid_t s_resgid; 1238 unsigned short s_mount_state; 1239 unsigned short s_pad; 1240 int s_addr_per_block_bits; 1241 int s_desc_per_block_bits; 1242 int s_inode_size; 1243 int s_first_ino; 1244 unsigned int s_inode_readahead_blks; 1245 unsigned int s_inode_goal; 1246 spinlock_t s_next_gen_lock; 1247 u32 s_next_generation; 1248 u32 s_hash_seed[4]; 1249 int s_def_hash_version; 1250 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1251 struct percpu_counter s_freeclusters_counter; 1252 struct percpu_counter s_freeinodes_counter; 1253 struct percpu_counter s_dirs_counter; 1254 struct percpu_counter s_dirtyclusters_counter; 1255 struct blockgroup_lock *s_blockgroup_lock; 1256 struct proc_dir_entry *s_proc; 1257 struct kobject s_kobj; 1258 struct completion s_kobj_unregister; 1259 struct super_block *s_sb; 1260 1261 /* Journaling */ 1262 struct journal_s *s_journal; 1263 struct list_head s_orphan; 1264 struct mutex s_orphan_lock; 1265 unsigned long s_resize_flags; /* Flags indicating if there 1266 is a resizer */ 1267 unsigned long s_commit_interval; 1268 u32 s_max_batch_time; 1269 u32 s_min_batch_time; 1270 struct block_device *journal_bdev; 1271 #ifdef CONFIG_QUOTA 1272 char *s_qf_names[EXT4_MAXQUOTAS]; /* Names of quota files with journalled quota */ 1273 int s_jquota_fmt; /* Format of quota to use */ 1274 #endif 1275 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1276 struct rb_root system_blks; 1277 1278 #ifdef EXTENTS_STATS 1279 /* ext4 extents stats */ 1280 unsigned long s_ext_min; 1281 unsigned long s_ext_max; 1282 unsigned long s_depth_max; 1283 spinlock_t s_ext_stats_lock; 1284 unsigned long s_ext_blocks; 1285 unsigned long s_ext_extents; 1286 #endif 1287 1288 /* for buddy allocator */ 1289 struct ext4_group_info ***s_group_info; 1290 struct inode *s_buddy_cache; 1291 spinlock_t s_md_lock; 1292 unsigned short *s_mb_offsets; 1293 unsigned int *s_mb_maxs; 1294 unsigned int s_group_info_size; 1295 1296 /* tunables */ 1297 unsigned long s_stripe; 1298 unsigned int s_mb_stream_request; 1299 unsigned int s_mb_max_to_scan; 1300 unsigned int s_mb_min_to_scan; 1301 unsigned int s_mb_stats; 1302 unsigned int s_mb_order2_reqs; 1303 unsigned int s_mb_group_prealloc; 1304 unsigned int s_max_dir_size_kb; 1305 /* where last allocation was done - for stream allocation */ 1306 unsigned long s_mb_last_group; 1307 unsigned long s_mb_last_start; 1308 1309 /* stats for buddy allocator */ 1310 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1311 atomic_t s_bal_success; /* we found long enough chunks */ 1312 atomic_t s_bal_allocated; /* in blocks */ 1313 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1314 atomic_t s_bal_goals; /* goal hits */ 1315 atomic_t s_bal_breaks; /* too long searches */ 1316 atomic_t s_bal_2orders; /* 2^order hits */ 1317 spinlock_t s_bal_lock; 1318 unsigned long s_mb_buddies_generated; 1319 unsigned long long s_mb_generation_time; 1320 atomic_t s_mb_lost_chunks; 1321 atomic_t s_mb_preallocated; 1322 atomic_t s_mb_discarded; 1323 atomic_t s_lock_busy; 1324 1325 /* locality groups */ 1326 struct ext4_locality_group __percpu *s_locality_groups; 1327 1328 /* for write statistics */ 1329 unsigned long s_sectors_written_start; 1330 u64 s_kbytes_written; 1331 1332 /* the size of zero-out chunk */ 1333 unsigned int s_extent_max_zeroout_kb; 1334 1335 unsigned int s_log_groups_per_flex; 1336 struct flex_groups *s_flex_groups; 1337 ext4_group_t s_flex_groups_allocated; 1338 1339 /* workqueue for reserved extent conversions (buffered io) */ 1340 struct workqueue_struct *rsv_conversion_wq; 1341 1342 /* timer for periodic error stats printing */ 1343 struct timer_list s_err_report; 1344 1345 /* Lazy inode table initialization info */ 1346 struct ext4_li_request *s_li_request; 1347 /* Wait multiplier for lazy initialization thread */ 1348 unsigned int s_li_wait_mult; 1349 1350 /* Kernel thread for multiple mount protection */ 1351 struct task_struct *s_mmp_tsk; 1352 1353 /* record the last minlen when FITRIM is called. */ 1354 atomic_t s_last_trim_minblks; 1355 1356 /* Reference to checksum algorithm driver via cryptoapi */ 1357 struct crypto_shash *s_chksum_driver; 1358 1359 /* Precomputed FS UUID checksum for seeding other checksums */ 1360 __u32 s_csum_seed; 1361 1362 /* Reclaim extents from extent status tree */ 1363 struct shrinker s_es_shrinker; 1364 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1365 long s_es_nr_inode; 1366 struct ext4_es_stats s_es_stats; 1367 struct mb_cache *s_mb_cache; 1368 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1369 1370 /* Ratelimit ext4 messages. */ 1371 struct ratelimit_state s_err_ratelimit_state; 1372 struct ratelimit_state s_warning_ratelimit_state; 1373 struct ratelimit_state s_msg_ratelimit_state; 1374 1375 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1376 /* Encryption */ 1377 uint32_t s_file_encryption_mode; 1378 uint32_t s_dir_encryption_mode; 1379 #endif 1380 }; 1381 1382 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1383 { 1384 return sb->s_fs_info; 1385 } 1386 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1387 { 1388 return container_of(inode, struct ext4_inode_info, vfs_inode); 1389 } 1390 1391 static inline struct timespec ext4_current_time(struct inode *inode) 1392 { 1393 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1394 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1395 } 1396 1397 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1398 { 1399 return ino == EXT4_ROOT_INO || 1400 ino == EXT4_USR_QUOTA_INO || 1401 ino == EXT4_GRP_QUOTA_INO || 1402 ino == EXT4_BOOT_LOADER_INO || 1403 ino == EXT4_JOURNAL_INO || 1404 ino == EXT4_RESIZE_INO || 1405 (ino >= EXT4_FIRST_INO(sb) && 1406 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1407 } 1408 1409 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 1410 struct ext4_io_end *io_end) 1411 { 1412 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 1413 io_end->flag |= EXT4_IO_END_UNWRITTEN; 1414 atomic_inc(&EXT4_I(inode)->i_unwritten); 1415 } 1416 } 1417 1418 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode) 1419 { 1420 return inode->i_private; 1421 } 1422 1423 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io) 1424 { 1425 inode->i_private = io; 1426 } 1427 1428 /* 1429 * Inode dynamic state flags 1430 */ 1431 enum { 1432 EXT4_STATE_JDATA, /* journaled data exists */ 1433 EXT4_STATE_NEW, /* inode is newly created */ 1434 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1435 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1436 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1437 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1438 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1439 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1440 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read 1441 nolocking */ 1442 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1443 EXT4_STATE_ORDERED_MODE, /* data=ordered mode */ 1444 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1445 }; 1446 1447 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1448 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1449 { \ 1450 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1451 } \ 1452 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1453 { \ 1454 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1455 } \ 1456 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1457 { \ 1458 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1459 } 1460 1461 /* Add these declarations here only so that these functions can be 1462 * found by name. Otherwise, they are very hard to locate. */ 1463 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1464 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1465 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1466 EXT4_INODE_BIT_FNS(flag, flags, 0) 1467 1468 /* Add these declarations here only so that these functions can be 1469 * found by name. Otherwise, they are very hard to locate. */ 1470 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1471 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1472 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1473 #if (BITS_PER_LONG < 64) 1474 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1475 1476 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1477 { 1478 (ei)->i_state_flags = 0; 1479 } 1480 #else 1481 EXT4_INODE_BIT_FNS(state, flags, 32) 1482 1483 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1484 { 1485 /* We depend on the fact that callers will set i_flags */ 1486 } 1487 #endif 1488 #else 1489 /* Assume that user mode programs are passing in an ext4fs superblock, not 1490 * a kernel struct super_block. This will allow us to call the feature-test 1491 * macros from user land. */ 1492 #define EXT4_SB(sb) (sb) 1493 #endif 1494 1495 /* 1496 * Returns true if the inode is inode is encrypted 1497 */ 1498 static inline int ext4_encrypted_inode(struct inode *inode) 1499 { 1500 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1501 return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT); 1502 #else 1503 return 0; 1504 #endif 1505 } 1506 1507 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1508 1509 /* 1510 * Codes for operating systems 1511 */ 1512 #define EXT4_OS_LINUX 0 1513 #define EXT4_OS_HURD 1 1514 #define EXT4_OS_MASIX 2 1515 #define EXT4_OS_FREEBSD 3 1516 #define EXT4_OS_LITES 4 1517 1518 /* 1519 * Revision levels 1520 */ 1521 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1522 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1523 1524 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1525 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1526 1527 #define EXT4_GOOD_OLD_INODE_SIZE 128 1528 1529 /* 1530 * Feature set definitions 1531 */ 1532 1533 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1534 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1535 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1536 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1537 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1538 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1539 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1540 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1541 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1542 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1543 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1544 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1545 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1546 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1547 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1548 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1549 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1550 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1551 1552 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1553 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1554 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1555 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1556 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1557 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1558 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1559 1560 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1561 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1562 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1563 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1564 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1565 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1566 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1567 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1568 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1569 /* 1570 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1571 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1572 * all other data structures' checksums. However, the METADATA_CSUM and 1573 * GDT_CSUM bits are mutually exclusive. 1574 */ 1575 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1576 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1577 1578 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1579 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1580 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1581 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1582 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1583 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1584 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1585 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1586 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1587 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1588 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1589 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */ 1590 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1591 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1592 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1593 1594 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1595 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1596 EXT4_FEATURE_INCOMPAT_META_BG) 1597 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1598 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1599 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1600 1601 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1602 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1603 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1604 EXT4_FEATURE_INCOMPAT_META_BG) 1605 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1606 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1607 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1608 1609 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 1610 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1611 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1612 EXT4_FEATURE_INCOMPAT_META_BG| \ 1613 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1614 EXT4_FEATURE_INCOMPAT_64BIT| \ 1615 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1616 EXT4_FEATURE_INCOMPAT_MMP | \ 1617 EXT4_FEATURE_INCOMPAT_INLINE_DATA) 1618 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1619 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1620 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1621 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1622 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1623 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1624 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1625 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1626 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1627 EXT4_FEATURE_RO_COMPAT_QUOTA) 1628 1629 /* 1630 * Default values for user and/or group using reserved blocks 1631 */ 1632 #define EXT4_DEF_RESUID 0 1633 #define EXT4_DEF_RESGID 0 1634 1635 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1636 1637 /* 1638 * Default mount options 1639 */ 1640 #define EXT4_DEFM_DEBUG 0x0001 1641 #define EXT4_DEFM_BSDGROUPS 0x0002 1642 #define EXT4_DEFM_XATTR_USER 0x0004 1643 #define EXT4_DEFM_ACL 0x0008 1644 #define EXT4_DEFM_UID16 0x0010 1645 #define EXT4_DEFM_JMODE 0x0060 1646 #define EXT4_DEFM_JMODE_DATA 0x0020 1647 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1648 #define EXT4_DEFM_JMODE_WBACK 0x0060 1649 #define EXT4_DEFM_NOBARRIER 0x0100 1650 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1651 #define EXT4_DEFM_DISCARD 0x0400 1652 #define EXT4_DEFM_NODELALLOC 0x0800 1653 1654 /* 1655 * Default journal batch times 1656 */ 1657 #define EXT4_DEF_MIN_BATCH_TIME 0 1658 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1659 1660 /* 1661 * Minimum number of groups in a flexgroup before we separate out 1662 * directories into the first block group of a flexgroup 1663 */ 1664 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1665 1666 /* 1667 * Structure of a directory entry 1668 */ 1669 #define EXT4_NAME_LEN 255 1670 1671 struct ext4_dir_entry { 1672 __le32 inode; /* Inode number */ 1673 __le16 rec_len; /* Directory entry length */ 1674 __le16 name_len; /* Name length */ 1675 char name[EXT4_NAME_LEN]; /* File name */ 1676 }; 1677 1678 /* 1679 * The new version of the directory entry. Since EXT4 structures are 1680 * stored in intel byte order, and the name_len field could never be 1681 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1682 * file_type field. 1683 */ 1684 struct ext4_dir_entry_2 { 1685 __le32 inode; /* Inode number */ 1686 __le16 rec_len; /* Directory entry length */ 1687 __u8 name_len; /* Name length */ 1688 __u8 file_type; 1689 char name[EXT4_NAME_LEN]; /* File name */ 1690 }; 1691 1692 /* 1693 * This is a bogus directory entry at the end of each leaf block that 1694 * records checksums. 1695 */ 1696 struct ext4_dir_entry_tail { 1697 __le32 det_reserved_zero1; /* Pretend to be unused */ 1698 __le16 det_rec_len; /* 12 */ 1699 __u8 det_reserved_zero2; /* Zero name length */ 1700 __u8 det_reserved_ft; /* 0xDE, fake file type */ 1701 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1702 }; 1703 1704 #define EXT4_DIRENT_TAIL(block, blocksize) \ 1705 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 1706 ((blocksize) - \ 1707 sizeof(struct ext4_dir_entry_tail)))) 1708 1709 /* 1710 * Ext4 directory file types. Only the low 3 bits are used. The 1711 * other bits are reserved for now. 1712 */ 1713 #define EXT4_FT_UNKNOWN 0 1714 #define EXT4_FT_REG_FILE 1 1715 #define EXT4_FT_DIR 2 1716 #define EXT4_FT_CHRDEV 3 1717 #define EXT4_FT_BLKDEV 4 1718 #define EXT4_FT_FIFO 5 1719 #define EXT4_FT_SOCK 6 1720 #define EXT4_FT_SYMLINK 7 1721 1722 #define EXT4_FT_MAX 8 1723 1724 #define EXT4_FT_DIR_CSUM 0xDE 1725 1726 /* 1727 * EXT4_DIR_PAD defines the directory entries boundaries 1728 * 1729 * NOTE: It must be a multiple of 4 1730 */ 1731 #define EXT4_DIR_PAD 4 1732 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1733 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1734 ~EXT4_DIR_ROUND) 1735 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1736 1737 /* 1738 * If we ever get support for fs block sizes > page_size, we'll need 1739 * to remove the #if statements in the next two functions... 1740 */ 1741 static inline unsigned int 1742 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1743 { 1744 unsigned len = le16_to_cpu(dlen); 1745 1746 #if (PAGE_CACHE_SIZE >= 65536) 1747 if (len == EXT4_MAX_REC_LEN || len == 0) 1748 return blocksize; 1749 return (len & 65532) | ((len & 3) << 16); 1750 #else 1751 return len; 1752 #endif 1753 } 1754 1755 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1756 { 1757 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1758 BUG(); 1759 #if (PAGE_CACHE_SIZE >= 65536) 1760 if (len < 65536) 1761 return cpu_to_le16(len); 1762 if (len == blocksize) { 1763 if (blocksize == 65536) 1764 return cpu_to_le16(EXT4_MAX_REC_LEN); 1765 else 1766 return cpu_to_le16(0); 1767 } 1768 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 1769 #else 1770 return cpu_to_le16(len); 1771 #endif 1772 } 1773 1774 /* 1775 * Hash Tree Directory indexing 1776 * (c) Daniel Phillips, 2001 1777 */ 1778 1779 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 1780 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 1781 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 1782 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 1783 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 1784 1785 /* Legal values for the dx_root hash_version field: */ 1786 1787 #define DX_HASH_LEGACY 0 1788 #define DX_HASH_HALF_MD4 1 1789 #define DX_HASH_TEA 2 1790 #define DX_HASH_LEGACY_UNSIGNED 3 1791 #define DX_HASH_HALF_MD4_UNSIGNED 4 1792 #define DX_HASH_TEA_UNSIGNED 5 1793 1794 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 1795 const void *address, unsigned int length) 1796 { 1797 struct { 1798 struct shash_desc shash; 1799 char ctx[4]; 1800 } desc; 1801 int err; 1802 1803 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 1804 1805 desc.shash.tfm = sbi->s_chksum_driver; 1806 desc.shash.flags = 0; 1807 *(u32 *)desc.ctx = crc; 1808 1809 err = crypto_shash_update(&desc.shash, address, length); 1810 BUG_ON(err); 1811 1812 return *(u32 *)desc.ctx; 1813 } 1814 1815 #ifdef __KERNEL__ 1816 1817 /* hash info structure used by the directory hash */ 1818 struct dx_hash_info 1819 { 1820 u32 hash; 1821 u32 minor_hash; 1822 int hash_version; 1823 u32 *seed; 1824 }; 1825 1826 1827 /* 32 and 64 bit signed EOF for dx directories */ 1828 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 1829 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 1830 1831 1832 /* 1833 * Control parameters used by ext4_htree_next_block 1834 */ 1835 #define HASH_NB_ALWAYS 1 1836 1837 1838 /* 1839 * Describe an inode's exact location on disk and in memory 1840 */ 1841 struct ext4_iloc 1842 { 1843 struct buffer_head *bh; 1844 unsigned long offset; 1845 ext4_group_t block_group; 1846 }; 1847 1848 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 1849 { 1850 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 1851 } 1852 1853 /* 1854 * This structure is stuffed into the struct file's private_data field 1855 * for directories. It is where we put information so that we can do 1856 * readdir operations in hash tree order. 1857 */ 1858 struct dir_private_info { 1859 struct rb_root root; 1860 struct rb_node *curr_node; 1861 struct fname *extra_fname; 1862 loff_t last_pos; 1863 __u32 curr_hash; 1864 __u32 curr_minor_hash; 1865 __u32 next_hash; 1866 }; 1867 1868 /* calculate the first block number of the group */ 1869 static inline ext4_fsblk_t 1870 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 1871 { 1872 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 1873 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 1874 } 1875 1876 /* 1877 * Special error return code only used by dx_probe() and its callers. 1878 */ 1879 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 1880 1881 /* 1882 * Timeout and state flag for lazy initialization inode thread. 1883 */ 1884 #define EXT4_DEF_LI_WAIT_MULT 10 1885 #define EXT4_DEF_LI_MAX_START_DELAY 5 1886 #define EXT4_LAZYINIT_QUIT 0x0001 1887 #define EXT4_LAZYINIT_RUNNING 0x0002 1888 1889 /* 1890 * Lazy inode table initialization info 1891 */ 1892 struct ext4_lazy_init { 1893 unsigned long li_state; 1894 struct list_head li_request_list; 1895 struct mutex li_list_mtx; 1896 }; 1897 1898 struct ext4_li_request { 1899 struct super_block *lr_super; 1900 struct ext4_sb_info *lr_sbi; 1901 ext4_group_t lr_next_group; 1902 struct list_head lr_request; 1903 unsigned long lr_next_sched; 1904 unsigned long lr_timeout; 1905 }; 1906 1907 struct ext4_features { 1908 struct kobject f_kobj; 1909 struct completion f_kobj_unregister; 1910 }; 1911 1912 /* 1913 * This structure will be used for multiple mount protection. It will be 1914 * written into the block number saved in the s_mmp_block field in the 1915 * superblock. Programs that check MMP should assume that if 1916 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 1917 * to use the filesystem, regardless of how old the timestamp is. 1918 */ 1919 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 1920 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 1921 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 1922 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 1923 1924 struct mmp_struct { 1925 __le32 mmp_magic; /* Magic number for MMP */ 1926 __le32 mmp_seq; /* Sequence no. updated periodically */ 1927 1928 /* 1929 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 1930 * purposes and do not affect the correctness of the algorithm 1931 */ 1932 __le64 mmp_time; /* Time last updated */ 1933 char mmp_nodename[64]; /* Node which last updated MMP block */ 1934 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 1935 1936 /* 1937 * mmp_check_interval is used to verify if the MMP block has been 1938 * updated on the block device. The value is updated based on the 1939 * maximum time to write the MMP block during an update cycle. 1940 */ 1941 __le16 mmp_check_interval; 1942 1943 __le16 mmp_pad1; 1944 __le32 mmp_pad2[226]; 1945 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 1946 }; 1947 1948 /* arguments passed to the mmp thread */ 1949 struct mmpd_data { 1950 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 1951 struct super_block *sb; /* super block of the fs */ 1952 }; 1953 1954 /* 1955 * Check interval multiplier 1956 * The MMP block is written every update interval and initially checked every 1957 * update interval x the multiplier (the value is then adapted based on the 1958 * write latency). The reason is that writes can be delayed under load and we 1959 * don't want readers to incorrectly assume that the filesystem is no longer 1960 * in use. 1961 */ 1962 #define EXT4_MMP_CHECK_MULT 2UL 1963 1964 /* 1965 * Minimum interval for MMP checking in seconds. 1966 */ 1967 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 1968 1969 /* 1970 * Maximum interval for MMP checking in seconds. 1971 */ 1972 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 1973 1974 /* 1975 * Function prototypes 1976 */ 1977 1978 /* 1979 * Ok, these declarations are also in <linux/kernel.h> but none of the 1980 * ext4 source programs needs to include it so they are duplicated here. 1981 */ 1982 # define NORET_TYPE /**/ 1983 # define ATTRIB_NORET __attribute__((noreturn)) 1984 # define NORET_AND noreturn, 1985 1986 /* bitmap.c */ 1987 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 1988 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 1989 struct ext4_group_desc *gdp, 1990 struct buffer_head *bh, int sz); 1991 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 1992 struct ext4_group_desc *gdp, 1993 struct buffer_head *bh, int sz); 1994 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 1995 struct ext4_group_desc *gdp, 1996 struct buffer_head *bh); 1997 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 1998 struct ext4_group_desc *gdp, 1999 struct buffer_head *bh); 2000 2001 /* balloc.c */ 2002 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2003 ext4_fsblk_t blocknr, 2004 ext4_group_t *blockgrpp, 2005 ext4_grpblk_t *offsetp); 2006 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2007 ext4_fsblk_t block); 2008 2009 extern unsigned int ext4_block_group(struct super_block *sb, 2010 ext4_fsblk_t blocknr); 2011 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2012 ext4_fsblk_t blocknr); 2013 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2014 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2015 ext4_group_t group); 2016 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2017 ext4_fsblk_t goal, 2018 unsigned int flags, 2019 unsigned long *count, 2020 int *errp); 2021 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2022 s64 nclusters, unsigned int flags); 2023 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2024 extern void ext4_check_blocks_bitmap(struct super_block *); 2025 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2026 ext4_group_t block_group, 2027 struct buffer_head ** bh); 2028 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2029 2030 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2031 ext4_group_t block_group); 2032 extern int ext4_wait_block_bitmap(struct super_block *sb, 2033 ext4_group_t block_group, 2034 struct buffer_head *bh); 2035 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2036 ext4_group_t block_group); 2037 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2038 ext4_group_t block_group, 2039 struct ext4_group_desc *gdp); 2040 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2041 2042 /* crypto_policy.c */ 2043 int ext4_is_child_context_consistent_with_parent(struct inode *parent, 2044 struct inode *child); 2045 int ext4_inherit_context(struct inode *parent, struct inode *child); 2046 void ext4_to_hex(char *dst, char *src, size_t src_size); 2047 int ext4_process_policy(const struct ext4_encryption_policy *policy, 2048 struct inode *inode); 2049 int ext4_get_policy(struct inode *inode, 2050 struct ext4_encryption_policy *policy); 2051 2052 /* crypto.c */ 2053 bool ext4_valid_contents_enc_mode(uint32_t mode); 2054 uint32_t ext4_validate_encryption_key_size(uint32_t mode, uint32_t size); 2055 extern struct workqueue_struct *ext4_read_workqueue; 2056 struct ext4_crypto_ctx *ext4_get_crypto_ctx(struct inode *inode); 2057 void ext4_release_crypto_ctx(struct ext4_crypto_ctx *ctx); 2058 void ext4_restore_control_page(struct page *data_page); 2059 struct page *ext4_encrypt(struct inode *inode, 2060 struct page *plaintext_page); 2061 int ext4_decrypt(struct ext4_crypto_ctx *ctx, struct page *page); 2062 int ext4_decrypt_one(struct inode *inode, struct page *page); 2063 int ext4_encrypted_zeroout(struct inode *inode, struct ext4_extent *ex); 2064 2065 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2066 int ext4_init_crypto(void); 2067 void ext4_exit_crypto(void); 2068 static inline int ext4_sb_has_crypto(struct super_block *sb) 2069 { 2070 return EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT); 2071 } 2072 #else 2073 static inline int ext4_init_crypto(void) { return 0; } 2074 static inline void ext4_exit_crypto(void) { } 2075 static inline int ext4_sb_has_crypto(struct super_block *sb) 2076 { 2077 return 0; 2078 } 2079 #endif 2080 2081 /* crypto_fname.c */ 2082 bool ext4_valid_filenames_enc_mode(uint32_t mode); 2083 u32 ext4_fname_crypto_round_up(u32 size, u32 blksize); 2084 int ext4_fname_crypto_alloc_buffer(struct ext4_fname_crypto_ctx *ctx, 2085 u32 ilen, struct ext4_str *crypto_str); 2086 int _ext4_fname_disk_to_usr(struct ext4_fname_crypto_ctx *ctx, 2087 const struct ext4_str *iname, 2088 struct ext4_str *oname); 2089 int ext4_fname_disk_to_usr(struct ext4_fname_crypto_ctx *ctx, 2090 const struct ext4_dir_entry_2 *de, 2091 struct ext4_str *oname); 2092 int ext4_fname_usr_to_disk(struct ext4_fname_crypto_ctx *ctx, 2093 const struct qstr *iname, 2094 struct ext4_str *oname); 2095 int ext4_fname_usr_to_hash(struct ext4_fname_crypto_ctx *ctx, 2096 const struct qstr *iname, 2097 struct dx_hash_info *hinfo); 2098 int ext4_fname_disk_to_hash(struct ext4_fname_crypto_ctx *ctx, 2099 const struct ext4_dir_entry_2 *de, 2100 struct dx_hash_info *hinfo); 2101 int ext4_fname_crypto_namelen_on_disk(struct ext4_fname_crypto_ctx *ctx, 2102 u32 namelen); 2103 2104 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2105 void ext4_put_fname_crypto_ctx(struct ext4_fname_crypto_ctx **ctx); 2106 struct ext4_fname_crypto_ctx *ext4_get_fname_crypto_ctx(struct inode *inode, 2107 u32 max_len); 2108 void ext4_fname_crypto_free_buffer(struct ext4_str *crypto_str); 2109 #else 2110 static inline 2111 void ext4_put_fname_crypto_ctx(struct ext4_fname_crypto_ctx **ctx) { } 2112 static inline 2113 struct ext4_fname_crypto_ctx *ext4_get_fname_crypto_ctx(struct inode *inode, 2114 u32 max_len) 2115 { 2116 return NULL; 2117 } 2118 static inline void ext4_fname_crypto_free_buffer(struct ext4_str *p) { } 2119 #endif 2120 2121 2122 /* crypto_key.c */ 2123 int ext4_generate_encryption_key(struct inode *inode); 2124 2125 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2126 int ext4_has_encryption_key(struct inode *inode); 2127 #else 2128 static inline int ext4_has_encryption_key(struct inode *inode) 2129 { 2130 return 0; 2131 } 2132 #endif 2133 2134 2135 /* dir.c */ 2136 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2137 struct file *, 2138 struct ext4_dir_entry_2 *, 2139 struct buffer_head *, char *, int, 2140 unsigned int); 2141 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2142 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2143 (de), (bh), (buf), (size), (offset))) 2144 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2145 __u32 minor_hash, 2146 struct ext4_dir_entry_2 *dirent, 2147 struct ext4_str *ent_name); 2148 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2149 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2150 struct buffer_head *bh, 2151 void *buf, int buf_size, 2152 const char *name, int namelen, 2153 struct ext4_dir_entry_2 **dest_de); 2154 int ext4_insert_dentry(struct inode *dir, 2155 struct inode *inode, 2156 struct ext4_dir_entry_2 *de, 2157 int buf_size, 2158 const struct qstr *iname, 2159 const char *name, int namelen); 2160 static inline void ext4_update_dx_flag(struct inode *inode) 2161 { 2162 if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb, 2163 EXT4_FEATURE_COMPAT_DIR_INDEX)) 2164 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2165 } 2166 static unsigned char ext4_filetype_table[] = { 2167 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2168 }; 2169 2170 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2171 { 2172 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE) || 2173 (filetype >= EXT4_FT_MAX)) 2174 return DT_UNKNOWN; 2175 2176 return ext4_filetype_table[filetype]; 2177 } 2178 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2179 void *buf, int buf_size); 2180 2181 /* fsync.c */ 2182 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2183 2184 /* hash.c */ 2185 extern int ext4fs_dirhash(const char *name, int len, struct 2186 dx_hash_info *hinfo); 2187 2188 /* ialloc.c */ 2189 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2190 const struct qstr *qstr, __u32 goal, 2191 uid_t *owner, int handle_type, 2192 unsigned int line_no, int nblocks); 2193 2194 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \ 2195 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2196 0, 0, 0) 2197 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2198 type, nblocks) \ 2199 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2200 (type), __LINE__, (nblocks)) 2201 2202 2203 extern void ext4_free_inode(handle_t *, struct inode *); 2204 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2205 extern unsigned long ext4_count_free_inodes(struct super_block *); 2206 extern unsigned long ext4_count_dirs(struct super_block *); 2207 extern void ext4_check_inodes_bitmap(struct super_block *); 2208 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2209 extern int ext4_init_inode_table(struct super_block *sb, 2210 ext4_group_t group, int barrier); 2211 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2212 2213 /* mballoc.c */ 2214 extern long ext4_mb_stats; 2215 extern long ext4_mb_max_to_scan; 2216 extern int ext4_mb_init(struct super_block *); 2217 extern int ext4_mb_release(struct super_block *); 2218 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2219 struct ext4_allocation_request *, int *); 2220 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2221 extern void ext4_discard_preallocations(struct inode *); 2222 extern int __init ext4_init_mballoc(void); 2223 extern void ext4_exit_mballoc(void); 2224 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2225 struct buffer_head *bh, ext4_fsblk_t block, 2226 unsigned long count, int flags); 2227 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2228 ext4_group_t ngroups); 2229 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2230 ext4_group_t i, struct ext4_group_desc *desc); 2231 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2232 ext4_fsblk_t block, unsigned long count); 2233 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2234 2235 /* inode.c */ 2236 int ext4_inode_is_fast_symlink(struct inode *inode); 2237 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2238 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2239 int ext4_get_block_write(struct inode *inode, sector_t iblock, 2240 struct buffer_head *bh_result, int create); 2241 int ext4_get_block(struct inode *inode, sector_t iblock, 2242 struct buffer_head *bh_result, int create); 2243 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2244 struct buffer_head *bh, int create); 2245 int ext4_walk_page_buffers(handle_t *handle, 2246 struct buffer_head *head, 2247 unsigned from, 2248 unsigned to, 2249 int *partial, 2250 int (*fn)(handle_t *handle, 2251 struct buffer_head *bh)); 2252 int do_journal_get_write_access(handle_t *handle, 2253 struct buffer_head *bh); 2254 #define FALL_BACK_TO_NONDELALLOC 1 2255 #define CONVERT_INLINE_DATA 2 2256 2257 extern struct inode *ext4_iget(struct super_block *, unsigned long); 2258 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long); 2259 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2260 extern int ext4_setattr(struct dentry *, struct iattr *); 2261 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 2262 struct kstat *stat); 2263 extern void ext4_evict_inode(struct inode *); 2264 extern void ext4_clear_inode(struct inode *); 2265 extern int ext4_sync_inode(handle_t *, struct inode *); 2266 extern void ext4_dirty_inode(struct inode *, int); 2267 extern int ext4_change_inode_journal_flag(struct inode *, int); 2268 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2269 extern int ext4_inode_attach_jinode(struct inode *inode); 2270 extern int ext4_can_truncate(struct inode *inode); 2271 extern void ext4_truncate(struct inode *); 2272 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2273 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 2274 extern void ext4_set_inode_flags(struct inode *); 2275 extern void ext4_get_inode_flags(struct ext4_inode_info *); 2276 extern int ext4_alloc_da_blocks(struct inode *inode); 2277 extern void ext4_set_aops(struct inode *inode); 2278 extern int ext4_writepage_trans_blocks(struct inode *); 2279 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2280 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2281 loff_t lstart, loff_t lend); 2282 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 2283 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2284 extern void ext4_da_update_reserve_space(struct inode *inode, 2285 int used, int quota_claim); 2286 2287 /* indirect.c */ 2288 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2289 struct ext4_map_blocks *map, int flags); 2290 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb, 2291 struct iov_iter *iter, loff_t offset); 2292 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2293 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2294 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2295 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2296 ext4_lblk_t start, ext4_lblk_t end); 2297 2298 /* ioctl.c */ 2299 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2300 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2301 2302 /* migrate.c */ 2303 extern int ext4_ext_migrate(struct inode *); 2304 extern int ext4_ind_migrate(struct inode *inode); 2305 2306 /* namei.c */ 2307 extern int ext4_dirent_csum_verify(struct inode *inode, 2308 struct ext4_dir_entry *dirent); 2309 extern int ext4_orphan_add(handle_t *, struct inode *); 2310 extern int ext4_orphan_del(handle_t *, struct inode *); 2311 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2312 __u32 start_minor_hash, __u32 *next_hash); 2313 extern int search_dir(struct buffer_head *bh, 2314 char *search_buf, 2315 int buf_size, 2316 struct inode *dir, 2317 const struct qstr *d_name, 2318 unsigned int offset, 2319 struct ext4_dir_entry_2 **res_dir); 2320 extern int ext4_generic_delete_entry(handle_t *handle, 2321 struct inode *dir, 2322 struct ext4_dir_entry_2 *de_del, 2323 struct buffer_head *bh, 2324 void *entry_buf, 2325 int buf_size, 2326 int csum_size); 2327 extern int ext4_empty_dir(struct inode *inode); 2328 2329 /* resize.c */ 2330 extern int ext4_group_add(struct super_block *sb, 2331 struct ext4_new_group_data *input); 2332 extern int ext4_group_extend(struct super_block *sb, 2333 struct ext4_super_block *es, 2334 ext4_fsblk_t n_blocks_count); 2335 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2336 2337 /* super.c */ 2338 extern int ext4_calculate_overhead(struct super_block *sb); 2339 extern void ext4_superblock_csum_set(struct super_block *sb); 2340 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 2341 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 2342 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2343 ext4_group_t ngroup); 2344 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2345 char nbuf[16]); 2346 2347 extern __printf(4, 5) 2348 void __ext4_error(struct super_block *, const char *, unsigned int, 2349 const char *, ...); 2350 extern __printf(5, 6) 2351 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2352 const char *, ...); 2353 extern __printf(5, 6) 2354 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2355 const char *, ...); 2356 extern void __ext4_std_error(struct super_block *, const char *, 2357 unsigned int, int); 2358 extern __printf(4, 5) 2359 void __ext4_abort(struct super_block *, const char *, unsigned int, 2360 const char *, ...); 2361 extern __printf(4, 5) 2362 void __ext4_warning(struct super_block *, const char *, unsigned int, 2363 const char *, ...); 2364 extern __printf(3, 4) 2365 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2366 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2367 const char *, unsigned int, const char *); 2368 extern __printf(7, 8) 2369 void __ext4_grp_locked_error(const char *, unsigned int, 2370 struct super_block *, ext4_group_t, 2371 unsigned long, ext4_fsblk_t, 2372 const char *, ...); 2373 2374 #ifdef CONFIG_PRINTK 2375 2376 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2377 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__) 2378 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2379 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2380 #define ext4_error(sb, fmt, ...) \ 2381 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2382 #define ext4_abort(sb, fmt, ...) \ 2383 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2384 #define ext4_warning(sb, fmt, ...) \ 2385 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2386 #define ext4_msg(sb, level, fmt, ...) \ 2387 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 2388 #define dump_mmp_msg(sb, mmp, msg) \ 2389 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 2390 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2391 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 2392 fmt, ##__VA_ARGS__) 2393 2394 #else 2395 2396 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2397 do { \ 2398 no_printk(fmt, ##__VA_ARGS__); \ 2399 __ext4_error_inode(inode, "", 0, block, " "); \ 2400 } while (0) 2401 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2402 do { \ 2403 no_printk(fmt, ##__VA_ARGS__); \ 2404 __ext4_error_file(file, "", 0, block, " "); \ 2405 } while (0) 2406 #define ext4_error(sb, fmt, ...) \ 2407 do { \ 2408 no_printk(fmt, ##__VA_ARGS__); \ 2409 __ext4_error(sb, "", 0, " "); \ 2410 } while (0) 2411 #define ext4_abort(sb, fmt, ...) \ 2412 do { \ 2413 no_printk(fmt, ##__VA_ARGS__); \ 2414 __ext4_abort(sb, "", 0, " "); \ 2415 } while (0) 2416 #define ext4_warning(sb, fmt, ...) \ 2417 do { \ 2418 no_printk(fmt, ##__VA_ARGS__); \ 2419 __ext4_warning(sb, "", 0, " "); \ 2420 } while (0) 2421 #define ext4_msg(sb, level, fmt, ...) \ 2422 do { \ 2423 no_printk(fmt, ##__VA_ARGS__); \ 2424 __ext4_msg(sb, "", " "); \ 2425 } while (0) 2426 #define dump_mmp_msg(sb, mmp, msg) \ 2427 __dump_mmp_msg(sb, mmp, "", 0, "") 2428 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2429 do { \ 2430 no_printk(fmt, ##__VA_ARGS__); \ 2431 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 2432 } while (0) 2433 2434 #endif 2435 2436 extern void ext4_update_dynamic_rev(struct super_block *sb); 2437 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2438 __u32 compat); 2439 extern int ext4_update_rocompat_feature(handle_t *handle, 2440 struct super_block *sb, __u32 rocompat); 2441 extern int ext4_update_incompat_feature(handle_t *handle, 2442 struct super_block *sb, __u32 incompat); 2443 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2444 struct ext4_group_desc *bg); 2445 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2446 struct ext4_group_desc *bg); 2447 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2448 struct ext4_group_desc *bg); 2449 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2450 struct ext4_group_desc *bg); 2451 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2452 struct ext4_group_desc *bg); 2453 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2454 struct ext4_group_desc *bg); 2455 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2456 struct ext4_group_desc *bg); 2457 extern void ext4_block_bitmap_set(struct super_block *sb, 2458 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2459 extern void ext4_inode_bitmap_set(struct super_block *sb, 2460 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2461 extern void ext4_inode_table_set(struct super_block *sb, 2462 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2463 extern void ext4_free_group_clusters_set(struct super_block *sb, 2464 struct ext4_group_desc *bg, 2465 __u32 count); 2466 extern void ext4_free_inodes_set(struct super_block *sb, 2467 struct ext4_group_desc *bg, __u32 count); 2468 extern void ext4_used_dirs_set(struct super_block *sb, 2469 struct ext4_group_desc *bg, __u32 count); 2470 extern void ext4_itable_unused_set(struct super_block *sb, 2471 struct ext4_group_desc *bg, __u32 count); 2472 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2473 struct ext4_group_desc *gdp); 2474 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2475 struct ext4_group_desc *gdp); 2476 extern int ext4_register_li_request(struct super_block *sb, 2477 ext4_group_t first_not_zeroed); 2478 2479 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2480 { 2481 return EXT4_HAS_RO_COMPAT_FEATURE(sb, 2482 EXT4_FEATURE_RO_COMPAT_GDT_CSUM) || 2483 (EXT4_SB(sb)->s_chksum_driver != NULL); 2484 } 2485 2486 static inline int ext4_has_metadata_csum(struct super_block *sb) 2487 { 2488 WARN_ON_ONCE(EXT4_HAS_RO_COMPAT_FEATURE(sb, 2489 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) && 2490 !EXT4_SB(sb)->s_chksum_driver); 2491 2492 return (EXT4_SB(sb)->s_chksum_driver != NULL); 2493 } 2494 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2495 { 2496 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2497 le32_to_cpu(es->s_blocks_count_lo); 2498 } 2499 2500 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2501 { 2502 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2503 le32_to_cpu(es->s_r_blocks_count_lo); 2504 } 2505 2506 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2507 { 2508 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2509 le32_to_cpu(es->s_free_blocks_count_lo); 2510 } 2511 2512 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2513 ext4_fsblk_t blk) 2514 { 2515 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2516 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2517 } 2518 2519 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2520 ext4_fsblk_t blk) 2521 { 2522 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2523 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2524 } 2525 2526 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2527 ext4_fsblk_t blk) 2528 { 2529 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2530 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2531 } 2532 2533 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 2534 { 2535 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2536 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2537 le32_to_cpu(raw_inode->i_size_lo); 2538 else 2539 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2540 } 2541 2542 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2543 { 2544 raw_inode->i_size_lo = cpu_to_le32(i_size); 2545 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2546 } 2547 2548 static inline 2549 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2550 ext4_group_t group) 2551 { 2552 struct ext4_group_info ***grp_info; 2553 long indexv, indexh; 2554 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 2555 grp_info = EXT4_SB(sb)->s_group_info; 2556 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2557 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2558 return grp_info[indexv][indexh]; 2559 } 2560 2561 /* 2562 * Reading s_groups_count requires using smp_rmb() afterwards. See 2563 * the locking protocol documented in the comments of ext4_group_add() 2564 * in resize.c 2565 */ 2566 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2567 { 2568 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2569 2570 smp_rmb(); 2571 return ngroups; 2572 } 2573 2574 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2575 ext4_group_t block_group) 2576 { 2577 return block_group >> sbi->s_log_groups_per_flex; 2578 } 2579 2580 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2581 { 2582 return 1 << sbi->s_log_groups_per_flex; 2583 } 2584 2585 #define ext4_std_error(sb, errno) \ 2586 do { \ 2587 if ((errno)) \ 2588 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2589 } while (0) 2590 2591 #ifdef CONFIG_SMP 2592 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2593 * counters. So we need to make sure we have free clusters more 2594 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2595 */ 2596 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2597 #else 2598 #define EXT4_FREECLUSTERS_WATERMARK 0 2599 #endif 2600 2601 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 2602 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2603 { 2604 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 2605 !mutex_is_locked(&inode->i_mutex)); 2606 down_write(&EXT4_I(inode)->i_data_sem); 2607 if (newsize > EXT4_I(inode)->i_disksize) 2608 EXT4_I(inode)->i_disksize = newsize; 2609 up_write(&EXT4_I(inode)->i_data_sem); 2610 } 2611 2612 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 2613 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 2614 { 2615 int changed = 0; 2616 2617 if (newsize > inode->i_size) { 2618 i_size_write(inode, newsize); 2619 changed = 1; 2620 } 2621 if (newsize > EXT4_I(inode)->i_disksize) { 2622 ext4_update_i_disksize(inode, newsize); 2623 changed |= 2; 2624 } 2625 return changed; 2626 } 2627 2628 struct ext4_group_info { 2629 unsigned long bb_state; 2630 struct rb_root bb_free_root; 2631 ext4_grpblk_t bb_first_free; /* first free block */ 2632 ext4_grpblk_t bb_free; /* total free blocks */ 2633 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 2634 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 2635 struct list_head bb_prealloc_list; 2636 #ifdef DOUBLE_CHECK 2637 void *bb_bitmap; 2638 #endif 2639 struct rw_semaphore alloc_sem; 2640 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2641 * regions, index is order. 2642 * bb_counters[3] = 5 means 2643 * 5 free 8-block regions. */ 2644 }; 2645 2646 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 2647 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 2648 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 2649 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 2650 2651 #define EXT4_MB_GRP_NEED_INIT(grp) \ 2652 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 2653 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 2654 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2655 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 2656 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2657 2658 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 2659 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2660 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 2661 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2662 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 2663 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2664 2665 #define EXT4_MAX_CONTENTION 8 2666 #define EXT4_CONTENTION_THRESHOLD 2 2667 2668 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2669 ext4_group_t group) 2670 { 2671 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2672 } 2673 2674 /* 2675 * Returns true if the filesystem is busy enough that attempts to 2676 * access the block group locks has run into contention. 2677 */ 2678 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 2679 { 2680 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 2681 } 2682 2683 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 2684 { 2685 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 2686 if (spin_trylock(lock)) 2687 /* 2688 * We're able to grab the lock right away, so drop the 2689 * lock contention counter. 2690 */ 2691 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 2692 else { 2693 /* 2694 * The lock is busy, so bump the contention counter, 2695 * and then wait on the spin lock. 2696 */ 2697 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 2698 EXT4_MAX_CONTENTION); 2699 spin_lock(lock); 2700 } 2701 } 2702 2703 static inline void ext4_unlock_group(struct super_block *sb, 2704 ext4_group_t group) 2705 { 2706 spin_unlock(ext4_group_lock_ptr(sb, group)); 2707 } 2708 2709 /* 2710 * Block validity checking 2711 */ 2712 #define ext4_check_indirect_blockref(inode, bh) \ 2713 ext4_check_blockref(__func__, __LINE__, inode, \ 2714 (__le32 *)(bh)->b_data, \ 2715 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 2716 2717 #define ext4_ind_check_inode(inode) \ 2718 ext4_check_blockref(__func__, __LINE__, inode, \ 2719 EXT4_I(inode)->i_data, \ 2720 EXT4_NDIR_BLOCKS) 2721 2722 /* 2723 * Inodes and files operations 2724 */ 2725 2726 /* dir.c */ 2727 extern const struct file_operations ext4_dir_operations; 2728 2729 /* file.c */ 2730 extern const struct inode_operations ext4_file_inode_operations; 2731 extern const struct file_operations ext4_file_operations; 2732 extern const struct file_operations ext4_dax_file_operations; 2733 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 2734 2735 /* inline.c */ 2736 extern int ext4_get_max_inline_size(struct inode *inode); 2737 extern int ext4_find_inline_data_nolock(struct inode *inode); 2738 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 2739 unsigned int len); 2740 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 2741 2742 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 2743 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 2744 struct inode *inode, 2745 loff_t pos, unsigned len, 2746 unsigned flags, 2747 struct page **pagep); 2748 extern int ext4_write_inline_data_end(struct inode *inode, 2749 loff_t pos, unsigned len, 2750 unsigned copied, 2751 struct page *page); 2752 extern struct buffer_head * 2753 ext4_journalled_write_inline_data(struct inode *inode, 2754 unsigned len, 2755 struct page *page); 2756 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 2757 struct inode *inode, 2758 loff_t pos, unsigned len, 2759 unsigned flags, 2760 struct page **pagep, 2761 void **fsdata); 2762 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 2763 unsigned len, unsigned copied, 2764 struct page *page); 2765 extern int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry, 2766 struct inode *inode); 2767 extern int ext4_try_create_inline_dir(handle_t *handle, 2768 struct inode *parent, 2769 struct inode *inode); 2770 extern int ext4_read_inline_dir(struct file *filp, 2771 struct dir_context *ctx, 2772 int *has_inline_data); 2773 extern int htree_inlinedir_to_tree(struct file *dir_file, 2774 struct inode *dir, ext4_lblk_t block, 2775 struct dx_hash_info *hinfo, 2776 __u32 start_hash, __u32 start_minor_hash, 2777 int *has_inline_data); 2778 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 2779 const struct qstr *d_name, 2780 struct ext4_dir_entry_2 **res_dir, 2781 int *has_inline_data); 2782 extern int ext4_delete_inline_entry(handle_t *handle, 2783 struct inode *dir, 2784 struct ext4_dir_entry_2 *de_del, 2785 struct buffer_head *bh, 2786 int *has_inline_data); 2787 extern int empty_inline_dir(struct inode *dir, int *has_inline_data); 2788 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 2789 struct ext4_dir_entry_2 **parent_de, 2790 int *retval); 2791 extern int ext4_inline_data_fiemap(struct inode *inode, 2792 struct fiemap_extent_info *fieinfo, 2793 int *has_inline, __u64 start, __u64 len); 2794 extern int ext4_try_to_evict_inline_data(handle_t *handle, 2795 struct inode *inode, 2796 int needed); 2797 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline); 2798 2799 extern int ext4_convert_inline_data(struct inode *inode); 2800 2801 static inline int ext4_has_inline_data(struct inode *inode) 2802 { 2803 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 2804 EXT4_I(inode)->i_inline_off; 2805 } 2806 2807 /* namei.c */ 2808 extern const struct inode_operations ext4_dir_inode_operations; 2809 extern const struct inode_operations ext4_special_inode_operations; 2810 extern struct dentry *ext4_get_parent(struct dentry *child); 2811 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 2812 struct ext4_dir_entry_2 *de, 2813 int blocksize, int csum_size, 2814 unsigned int parent_ino, int dotdot_real_len); 2815 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t, 2816 unsigned int blocksize); 2817 extern int ext4_handle_dirty_dirent_node(handle_t *handle, 2818 struct inode *inode, 2819 struct buffer_head *bh); 2820 #define S_SHIFT 12 2821 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = { 2822 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 2823 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 2824 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 2825 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 2826 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 2827 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 2828 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 2829 }; 2830 2831 static inline void ext4_set_de_type(struct super_block *sb, 2832 struct ext4_dir_entry_2 *de, 2833 umode_t mode) { 2834 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE)) 2835 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 2836 } 2837 2838 /* readpages.c */ 2839 extern int ext4_mpage_readpages(struct address_space *mapping, 2840 struct list_head *pages, struct page *page, 2841 unsigned nr_pages); 2842 2843 /* symlink.c */ 2844 extern const struct inode_operations ext4_symlink_inode_operations; 2845 extern const struct inode_operations ext4_fast_symlink_inode_operations; 2846 2847 /* block_validity */ 2848 extern void ext4_release_system_zone(struct super_block *sb); 2849 extern int ext4_setup_system_zone(struct super_block *sb); 2850 extern int __init ext4_init_system_zone(void); 2851 extern void ext4_exit_system_zone(void); 2852 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 2853 ext4_fsblk_t start_blk, 2854 unsigned int count); 2855 extern int ext4_check_blockref(const char *, unsigned int, 2856 struct inode *, __le32 *, unsigned int); 2857 2858 /* extents.c */ 2859 struct ext4_ext_path; 2860 struct ext4_extent; 2861 2862 /* 2863 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 2864 * __le32. 2865 */ 2866 #define EXT_MAX_BLOCKS 0xffffffff 2867 2868 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 2869 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 2870 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 2871 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 2872 struct ext4_map_blocks *map, int flags); 2873 extern void ext4_ext_truncate(handle_t *, struct inode *); 2874 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 2875 ext4_lblk_t end); 2876 extern void ext4_ext_init(struct super_block *); 2877 extern void ext4_ext_release(struct super_block *); 2878 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 2879 loff_t len); 2880 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 2881 loff_t offset, ssize_t len); 2882 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 2883 struct ext4_map_blocks *map, int flags); 2884 extern int ext4_ext_calc_metadata_amount(struct inode *inode, 2885 ext4_lblk_t lblocks); 2886 extern int ext4_extent_tree_init(handle_t *, struct inode *); 2887 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 2888 int num, 2889 struct ext4_ext_path *path); 2890 extern int ext4_can_extents_be_merged(struct inode *inode, 2891 struct ext4_extent *ex1, 2892 struct ext4_extent *ex2); 2893 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 2894 struct ext4_ext_path **, 2895 struct ext4_extent *, int); 2896 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 2897 struct ext4_ext_path **, 2898 int flags); 2899 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 2900 extern int ext4_ext_check_inode(struct inode *inode); 2901 extern int ext4_find_delalloc_range(struct inode *inode, 2902 ext4_lblk_t lblk_start, 2903 ext4_lblk_t lblk_end); 2904 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk); 2905 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 2906 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2907 __u64 start, __u64 len); 2908 extern int ext4_ext_precache(struct inode *inode); 2909 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len); 2910 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 2911 struct inode *inode2, ext4_lblk_t lblk1, 2912 ext4_lblk_t lblk2, ext4_lblk_t count, 2913 int mark_unwritten,int *err); 2914 2915 /* move_extent.c */ 2916 extern void ext4_double_down_write_data_sem(struct inode *first, 2917 struct inode *second); 2918 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 2919 struct inode *donor_inode); 2920 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 2921 __u64 start_orig, __u64 start_donor, 2922 __u64 len, __u64 *moved_len); 2923 2924 /* page-io.c */ 2925 extern int __init ext4_init_pageio(void); 2926 extern void ext4_exit_pageio(void); 2927 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 2928 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 2929 extern int ext4_put_io_end(ext4_io_end_t *io_end); 2930 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 2931 extern void ext4_io_submit_init(struct ext4_io_submit *io, 2932 struct writeback_control *wbc); 2933 extern void ext4_end_io_rsv_work(struct work_struct *work); 2934 extern void ext4_io_submit(struct ext4_io_submit *io); 2935 extern int ext4_bio_write_page(struct ext4_io_submit *io, 2936 struct page *page, 2937 int len, 2938 struct writeback_control *wbc, 2939 bool keep_towrite); 2940 2941 /* mmp.c */ 2942 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 2943 2944 /* 2945 * Add new method to test whether block and inode bitmaps are properly 2946 * initialized. With uninit_bg reading the block from disk is not enough 2947 * to mark the bitmap uptodate. We need to also zero-out the bitmap 2948 */ 2949 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 2950 2951 static inline int bitmap_uptodate(struct buffer_head *bh) 2952 { 2953 return (buffer_uptodate(bh) && 2954 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 2955 } 2956 static inline void set_bitmap_uptodate(struct buffer_head *bh) 2957 { 2958 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 2959 } 2960 2961 /* 2962 * Disable DIO read nolock optimization, so new dioreaders will be forced 2963 * to grab i_mutex 2964 */ 2965 static inline void ext4_inode_block_unlocked_dio(struct inode *inode) 2966 { 2967 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 2968 smp_mb(); 2969 } 2970 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode) 2971 { 2972 smp_mb(); 2973 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 2974 } 2975 2976 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 2977 2978 /* For ioend & aio unwritten conversion wait queues */ 2979 #define EXT4_WQ_HASH_SZ 37 2980 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 2981 EXT4_WQ_HASH_SZ]) 2982 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\ 2983 EXT4_WQ_HASH_SZ]) 2984 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 2985 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; 2986 2987 #define EXT4_RESIZING 0 2988 extern int ext4_resize_begin(struct super_block *sb); 2989 extern void ext4_resize_end(struct super_block *sb); 2990 2991 #endif /* __KERNEL__ */ 2992 2993 #endif /* _EXT4_H */ 2994