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 char i_crypt_policy_flags; 915 916 /* Indicate the inline data space. */ 917 u16 i_inline_off; 918 u16 i_inline_size; 919 920 #ifdef CONFIG_QUOTA 921 /* quota space reservation, managed internally by quota code */ 922 qsize_t i_reserved_quota; 923 #endif 924 925 /* Lock protecting lists below */ 926 spinlock_t i_completed_io_lock; 927 /* 928 * Completed IOs that need unwritten extents handling and have 929 * transaction reserved 930 */ 931 struct list_head i_rsv_conversion_list; 932 /* 933 * Completed IOs that need unwritten extents handling and don't have 934 * transaction reserved 935 */ 936 atomic_t i_ioend_count; /* Number of outstanding io_end structs */ 937 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 938 struct work_struct i_rsv_conversion_work; 939 940 spinlock_t i_block_reservation_lock; 941 942 /* 943 * Transactions that contain inode's metadata needed to complete 944 * fsync and fdatasync, respectively. 945 */ 946 tid_t i_sync_tid; 947 tid_t i_datasync_tid; 948 949 #ifdef CONFIG_QUOTA 950 struct dquot *i_dquot[MAXQUOTAS]; 951 #endif 952 953 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 954 __u32 i_csum_seed; 955 956 #ifdef CONFIG_EXT4_FS_ENCRYPTION 957 /* Encryption params */ 958 struct ext4_encryption_key i_encryption_key; 959 #endif 960 }; 961 962 /* 963 * File system states 964 */ 965 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 966 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 967 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 968 969 /* 970 * Misc. filesystem flags 971 */ 972 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 973 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 974 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 975 976 /* 977 * Mount flags set via mount options or defaults 978 */ 979 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 980 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 981 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 982 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 983 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 984 #define EXT4_MOUNT_ERRORS_MASK 0x00070 985 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 986 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 987 #ifdef CONFIG_FS_DAX 988 #define EXT4_MOUNT_DAX 0x00200 /* Direct Access */ 989 #else 990 #define EXT4_MOUNT_DAX 0 991 #endif 992 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 993 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 994 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 995 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 996 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 997 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 998 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 999 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1000 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1001 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1002 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 1003 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 1004 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 1005 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1006 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1007 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1008 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1009 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1010 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1011 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1012 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1013 1014 /* 1015 * Mount flags set either automatically (could not be set by mount option) 1016 * based on per file system feature or property or in special cases such as 1017 * distinguishing between explicit mount option definition and default. 1018 */ 1019 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1020 specified delalloc */ 1021 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1022 size of blocksize * 8 1023 blocks */ 1024 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1025 file systems */ 1026 1027 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1028 ~EXT4_MOUNT_##opt 1029 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1030 EXT4_MOUNT_##opt 1031 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1032 EXT4_MOUNT_##opt) 1033 1034 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1035 ~EXT4_MOUNT2_##opt 1036 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1037 EXT4_MOUNT2_##opt 1038 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1039 EXT4_MOUNT2_##opt) 1040 1041 #define ext4_test_and_set_bit __test_and_set_bit_le 1042 #define ext4_set_bit __set_bit_le 1043 #define ext4_set_bit_atomic ext2_set_bit_atomic 1044 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1045 #define ext4_clear_bit __clear_bit_le 1046 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1047 #define ext4_test_bit test_bit_le 1048 #define ext4_find_next_zero_bit find_next_zero_bit_le 1049 #define ext4_find_next_bit find_next_bit_le 1050 1051 extern void ext4_set_bits(void *bm, int cur, int len); 1052 1053 /* 1054 * Maximal mount counts between two filesystem checks 1055 */ 1056 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1057 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1058 1059 /* 1060 * Behaviour when detecting errors 1061 */ 1062 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1063 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1064 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1065 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1066 1067 /* Metadata checksum algorithm codes */ 1068 #define EXT4_CRC32C_CHKSUM 1 1069 1070 /* 1071 * Structure of the super block 1072 */ 1073 struct ext4_super_block { 1074 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1075 __le32 s_blocks_count_lo; /* Blocks count */ 1076 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1077 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1078 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1079 __le32 s_first_data_block; /* First Data Block */ 1080 __le32 s_log_block_size; /* Block size */ 1081 __le32 s_log_cluster_size; /* Allocation cluster size */ 1082 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1083 __le32 s_clusters_per_group; /* # Clusters per group */ 1084 __le32 s_inodes_per_group; /* # Inodes per group */ 1085 __le32 s_mtime; /* Mount time */ 1086 /*30*/ __le32 s_wtime; /* Write time */ 1087 __le16 s_mnt_count; /* Mount count */ 1088 __le16 s_max_mnt_count; /* Maximal mount count */ 1089 __le16 s_magic; /* Magic signature */ 1090 __le16 s_state; /* File system state */ 1091 __le16 s_errors; /* Behaviour when detecting errors */ 1092 __le16 s_minor_rev_level; /* minor revision level */ 1093 /*40*/ __le32 s_lastcheck; /* time of last check */ 1094 __le32 s_checkinterval; /* max. time between checks */ 1095 __le32 s_creator_os; /* OS */ 1096 __le32 s_rev_level; /* Revision level */ 1097 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1098 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1099 /* 1100 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1101 * 1102 * Note: the difference between the compatible feature set and 1103 * the incompatible feature set is that if there is a bit set 1104 * in the incompatible feature set that the kernel doesn't 1105 * know about, it should refuse to mount the filesystem. 1106 * 1107 * e2fsck's requirements are more strict; if it doesn't know 1108 * about a feature in either the compatible or incompatible 1109 * feature set, it must abort and not try to meddle with 1110 * things it doesn't understand... 1111 */ 1112 __le32 s_first_ino; /* First non-reserved inode */ 1113 __le16 s_inode_size; /* size of inode structure */ 1114 __le16 s_block_group_nr; /* block group # of this superblock */ 1115 __le32 s_feature_compat; /* compatible feature set */ 1116 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1117 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1118 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1119 /*78*/ char s_volume_name[16]; /* volume name */ 1120 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 1121 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1122 /* 1123 * Performance hints. Directory preallocation should only 1124 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1125 */ 1126 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1127 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1128 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1129 /* 1130 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1131 */ 1132 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1133 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1134 __le32 s_journal_dev; /* device number of journal file */ 1135 __le32 s_last_orphan; /* start of list of inodes to delete */ 1136 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1137 __u8 s_def_hash_version; /* Default hash version to use */ 1138 __u8 s_jnl_backup_type; 1139 __le16 s_desc_size; /* size of group descriptor */ 1140 /*100*/ __le32 s_default_mount_opts; 1141 __le32 s_first_meta_bg; /* First metablock block group */ 1142 __le32 s_mkfs_time; /* When the filesystem was created */ 1143 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1144 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1145 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1146 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1147 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1148 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1149 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1150 __le32 s_flags; /* Miscellaneous flags */ 1151 __le16 s_raid_stride; /* RAID stride */ 1152 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1153 __le64 s_mmp_block; /* Block for multi-mount protection */ 1154 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1155 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1156 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1157 __u8 s_encryption_level; /* versioning level for encryption */ 1158 __u8 s_reserved_pad; /* Padding to next 32bits */ 1159 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1160 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1161 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1162 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1163 snapshot's future use */ 1164 __le32 s_snapshot_list; /* inode number of the head of the 1165 on-disk snapshot list */ 1166 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1167 __le32 s_error_count; /* number of fs errors */ 1168 __le32 s_first_error_time; /* first time an error happened */ 1169 __le32 s_first_error_ino; /* inode involved in first error */ 1170 __le64 s_first_error_block; /* block involved of first error */ 1171 __u8 s_first_error_func[32]; /* function where the error happened */ 1172 __le32 s_first_error_line; /* line number where error happened */ 1173 __le32 s_last_error_time; /* most recent time of an error */ 1174 __le32 s_last_error_ino; /* inode involved in last error */ 1175 __le32 s_last_error_line; /* line number where error happened */ 1176 __le64 s_last_error_block; /* block involved of last error */ 1177 __u8 s_last_error_func[32]; /* function where the error happened */ 1178 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1179 __u8 s_mount_opts[64]; 1180 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1181 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1182 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1183 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1184 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1185 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1186 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1187 __le32 s_reserved[100]; /* Padding to the end of the block */ 1188 __le32 s_checksum; /* crc32c(superblock) */ 1189 }; 1190 1191 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1192 1193 #ifdef __KERNEL__ 1194 1195 /* 1196 * run-time mount flags 1197 */ 1198 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1199 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1200 #define EXT4_MF_TEST_DUMMY_ENCRYPTION 0x0004 1201 1202 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1203 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \ 1204 EXT4_MF_TEST_DUMMY_ENCRYPTION)) 1205 #else 1206 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0) 1207 #endif 1208 1209 /* Number of quota types we support */ 1210 #define EXT4_MAXQUOTAS 2 1211 1212 /* 1213 * fourth extended-fs super-block data in memory 1214 */ 1215 struct ext4_sb_info { 1216 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1217 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1218 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1219 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1220 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1221 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1222 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1223 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1224 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1225 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1226 unsigned long s_overhead; /* # of fs overhead clusters */ 1227 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1228 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1229 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1230 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1231 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1232 struct buffer_head **s_group_desc; 1233 unsigned int s_mount_opt; 1234 unsigned int s_mount_opt2; 1235 unsigned int s_mount_flags; 1236 unsigned int s_def_mount_opt; 1237 ext4_fsblk_t s_sb_block; 1238 atomic64_t s_resv_clusters; 1239 kuid_t s_resuid; 1240 kgid_t s_resgid; 1241 unsigned short s_mount_state; 1242 unsigned short s_pad; 1243 int s_addr_per_block_bits; 1244 int s_desc_per_block_bits; 1245 int s_inode_size; 1246 int s_first_ino; 1247 unsigned int s_inode_readahead_blks; 1248 unsigned int s_inode_goal; 1249 spinlock_t s_next_gen_lock; 1250 u32 s_next_generation; 1251 u32 s_hash_seed[4]; 1252 int s_def_hash_version; 1253 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1254 struct percpu_counter s_freeclusters_counter; 1255 struct percpu_counter s_freeinodes_counter; 1256 struct percpu_counter s_dirs_counter; 1257 struct percpu_counter s_dirtyclusters_counter; 1258 struct blockgroup_lock *s_blockgroup_lock; 1259 struct proc_dir_entry *s_proc; 1260 struct kobject s_kobj; 1261 struct completion s_kobj_unregister; 1262 struct super_block *s_sb; 1263 1264 /* Journaling */ 1265 struct journal_s *s_journal; 1266 struct list_head s_orphan; 1267 struct mutex s_orphan_lock; 1268 unsigned long s_resize_flags; /* Flags indicating if there 1269 is a resizer */ 1270 unsigned long s_commit_interval; 1271 u32 s_max_batch_time; 1272 u32 s_min_batch_time; 1273 struct block_device *journal_bdev; 1274 #ifdef CONFIG_QUOTA 1275 char *s_qf_names[EXT4_MAXQUOTAS]; /* Names of quota files with journalled quota */ 1276 int s_jquota_fmt; /* Format of quota to use */ 1277 #endif 1278 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1279 struct rb_root system_blks; 1280 1281 #ifdef EXTENTS_STATS 1282 /* ext4 extents stats */ 1283 unsigned long s_ext_min; 1284 unsigned long s_ext_max; 1285 unsigned long s_depth_max; 1286 spinlock_t s_ext_stats_lock; 1287 unsigned long s_ext_blocks; 1288 unsigned long s_ext_extents; 1289 #endif 1290 1291 /* for buddy allocator */ 1292 struct ext4_group_info ***s_group_info; 1293 struct inode *s_buddy_cache; 1294 spinlock_t s_md_lock; 1295 unsigned short *s_mb_offsets; 1296 unsigned int *s_mb_maxs; 1297 unsigned int s_group_info_size; 1298 1299 /* tunables */ 1300 unsigned long s_stripe; 1301 unsigned int s_mb_stream_request; 1302 unsigned int s_mb_max_to_scan; 1303 unsigned int s_mb_min_to_scan; 1304 unsigned int s_mb_stats; 1305 unsigned int s_mb_order2_reqs; 1306 unsigned int s_mb_group_prealloc; 1307 unsigned int s_max_dir_size_kb; 1308 /* where last allocation was done - for stream allocation */ 1309 unsigned long s_mb_last_group; 1310 unsigned long s_mb_last_start; 1311 1312 /* stats for buddy allocator */ 1313 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1314 atomic_t s_bal_success; /* we found long enough chunks */ 1315 atomic_t s_bal_allocated; /* in blocks */ 1316 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1317 atomic_t s_bal_goals; /* goal hits */ 1318 atomic_t s_bal_breaks; /* too long searches */ 1319 atomic_t s_bal_2orders; /* 2^order hits */ 1320 spinlock_t s_bal_lock; 1321 unsigned long s_mb_buddies_generated; 1322 unsigned long long s_mb_generation_time; 1323 atomic_t s_mb_lost_chunks; 1324 atomic_t s_mb_preallocated; 1325 atomic_t s_mb_discarded; 1326 atomic_t s_lock_busy; 1327 1328 /* locality groups */ 1329 struct ext4_locality_group __percpu *s_locality_groups; 1330 1331 /* for write statistics */ 1332 unsigned long s_sectors_written_start; 1333 u64 s_kbytes_written; 1334 1335 /* the size of zero-out chunk */ 1336 unsigned int s_extent_max_zeroout_kb; 1337 1338 unsigned int s_log_groups_per_flex; 1339 struct flex_groups *s_flex_groups; 1340 ext4_group_t s_flex_groups_allocated; 1341 1342 /* workqueue for reserved extent conversions (buffered io) */ 1343 struct workqueue_struct *rsv_conversion_wq; 1344 1345 /* timer for periodic error stats printing */ 1346 struct timer_list s_err_report; 1347 1348 /* Lazy inode table initialization info */ 1349 struct ext4_li_request *s_li_request; 1350 /* Wait multiplier for lazy initialization thread */ 1351 unsigned int s_li_wait_mult; 1352 1353 /* Kernel thread for multiple mount protection */ 1354 struct task_struct *s_mmp_tsk; 1355 1356 /* record the last minlen when FITRIM is called. */ 1357 atomic_t s_last_trim_minblks; 1358 1359 /* Reference to checksum algorithm driver via cryptoapi */ 1360 struct crypto_shash *s_chksum_driver; 1361 1362 /* Precomputed FS UUID checksum for seeding other checksums */ 1363 __u32 s_csum_seed; 1364 1365 /* Reclaim extents from extent status tree */ 1366 struct shrinker s_es_shrinker; 1367 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1368 long s_es_nr_inode; 1369 struct ext4_es_stats s_es_stats; 1370 struct mb_cache *s_mb_cache; 1371 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1372 1373 /* Ratelimit ext4 messages. */ 1374 struct ratelimit_state s_err_ratelimit_state; 1375 struct ratelimit_state s_warning_ratelimit_state; 1376 struct ratelimit_state s_msg_ratelimit_state; 1377 1378 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1379 /* Encryption */ 1380 uint32_t s_file_encryption_mode; 1381 uint32_t s_dir_encryption_mode; 1382 #endif 1383 }; 1384 1385 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1386 { 1387 return sb->s_fs_info; 1388 } 1389 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1390 { 1391 return container_of(inode, struct ext4_inode_info, vfs_inode); 1392 } 1393 1394 static inline struct timespec ext4_current_time(struct inode *inode) 1395 { 1396 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1397 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1398 } 1399 1400 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1401 { 1402 return ino == EXT4_ROOT_INO || 1403 ino == EXT4_USR_QUOTA_INO || 1404 ino == EXT4_GRP_QUOTA_INO || 1405 ino == EXT4_BOOT_LOADER_INO || 1406 ino == EXT4_JOURNAL_INO || 1407 ino == EXT4_RESIZE_INO || 1408 (ino >= EXT4_FIRST_INO(sb) && 1409 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1410 } 1411 1412 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 1413 struct ext4_io_end *io_end) 1414 { 1415 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 1416 io_end->flag |= EXT4_IO_END_UNWRITTEN; 1417 atomic_inc(&EXT4_I(inode)->i_unwritten); 1418 } 1419 } 1420 1421 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode) 1422 { 1423 return inode->i_private; 1424 } 1425 1426 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io) 1427 { 1428 inode->i_private = io; 1429 } 1430 1431 /* 1432 * Inode dynamic state flags 1433 */ 1434 enum { 1435 EXT4_STATE_JDATA, /* journaled data exists */ 1436 EXT4_STATE_NEW, /* inode is newly created */ 1437 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1438 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1439 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1440 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1441 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1442 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1443 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read 1444 nolocking */ 1445 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1446 EXT4_STATE_ORDERED_MODE, /* data=ordered mode */ 1447 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1448 }; 1449 1450 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1451 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1452 { \ 1453 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1454 } \ 1455 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1456 { \ 1457 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1458 } \ 1459 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1460 { \ 1461 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1462 } 1463 1464 /* Add these declarations here only so that these functions can be 1465 * found by name. Otherwise, they are very hard to locate. */ 1466 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1467 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1468 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1469 EXT4_INODE_BIT_FNS(flag, flags, 0) 1470 1471 /* Add these declarations here only so that these functions can be 1472 * found by name. Otherwise, they are very hard to locate. */ 1473 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1474 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1475 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1476 #if (BITS_PER_LONG < 64) 1477 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1478 1479 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1480 { 1481 (ei)->i_state_flags = 0; 1482 } 1483 #else 1484 EXT4_INODE_BIT_FNS(state, flags, 32) 1485 1486 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1487 { 1488 /* We depend on the fact that callers will set i_flags */ 1489 } 1490 #endif 1491 #else 1492 /* Assume that user mode programs are passing in an ext4fs superblock, not 1493 * a kernel struct super_block. This will allow us to call the feature-test 1494 * macros from user land. */ 1495 #define EXT4_SB(sb) (sb) 1496 #endif 1497 1498 /* 1499 * Returns true if the inode is inode is encrypted 1500 */ 1501 static inline int ext4_encrypted_inode(struct inode *inode) 1502 { 1503 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1504 return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT); 1505 #else 1506 return 0; 1507 #endif 1508 } 1509 1510 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1511 1512 /* 1513 * Codes for operating systems 1514 */ 1515 #define EXT4_OS_LINUX 0 1516 #define EXT4_OS_HURD 1 1517 #define EXT4_OS_MASIX 2 1518 #define EXT4_OS_FREEBSD 3 1519 #define EXT4_OS_LITES 4 1520 1521 /* 1522 * Revision levels 1523 */ 1524 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1525 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1526 1527 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1528 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1529 1530 #define EXT4_GOOD_OLD_INODE_SIZE 128 1531 1532 /* 1533 * Feature set definitions 1534 */ 1535 1536 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1537 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1538 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1539 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1540 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1541 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1542 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1543 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1544 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1545 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1546 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1547 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1548 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1549 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1550 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1551 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1552 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1553 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1554 1555 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1556 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1557 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1558 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1559 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1560 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1561 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1562 1563 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1564 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1565 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1566 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1567 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1568 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1569 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1570 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1571 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1572 /* 1573 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1574 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1575 * all other data structures' checksums. However, the METADATA_CSUM and 1576 * GDT_CSUM bits are mutually exclusive. 1577 */ 1578 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1579 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1580 1581 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1582 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1583 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1584 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1585 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1586 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1587 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1588 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1589 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1590 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1591 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1592 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */ 1593 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1594 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1595 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1596 1597 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1598 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1599 EXT4_FEATURE_INCOMPAT_META_BG) 1600 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1601 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1602 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1603 1604 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1605 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1606 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1607 EXT4_FEATURE_INCOMPAT_META_BG) 1608 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1609 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1610 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1611 1612 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 1613 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1614 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1615 EXT4_FEATURE_INCOMPAT_META_BG| \ 1616 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1617 EXT4_FEATURE_INCOMPAT_64BIT| \ 1618 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1619 EXT4_FEATURE_INCOMPAT_MMP | \ 1620 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 1621 EXT4_FEATURE_INCOMPAT_ENCRYPT) 1622 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1623 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1624 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1625 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1626 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1627 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1628 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1629 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1630 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1631 EXT4_FEATURE_RO_COMPAT_QUOTA) 1632 1633 /* 1634 * Default values for user and/or group using reserved blocks 1635 */ 1636 #define EXT4_DEF_RESUID 0 1637 #define EXT4_DEF_RESGID 0 1638 1639 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1640 1641 /* 1642 * Default mount options 1643 */ 1644 #define EXT4_DEFM_DEBUG 0x0001 1645 #define EXT4_DEFM_BSDGROUPS 0x0002 1646 #define EXT4_DEFM_XATTR_USER 0x0004 1647 #define EXT4_DEFM_ACL 0x0008 1648 #define EXT4_DEFM_UID16 0x0010 1649 #define EXT4_DEFM_JMODE 0x0060 1650 #define EXT4_DEFM_JMODE_DATA 0x0020 1651 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1652 #define EXT4_DEFM_JMODE_WBACK 0x0060 1653 #define EXT4_DEFM_NOBARRIER 0x0100 1654 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1655 #define EXT4_DEFM_DISCARD 0x0400 1656 #define EXT4_DEFM_NODELALLOC 0x0800 1657 1658 /* 1659 * Default journal batch times 1660 */ 1661 #define EXT4_DEF_MIN_BATCH_TIME 0 1662 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1663 1664 /* 1665 * Minimum number of groups in a flexgroup before we separate out 1666 * directories into the first block group of a flexgroup 1667 */ 1668 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1669 1670 /* 1671 * Structure of a directory entry 1672 */ 1673 #define EXT4_NAME_LEN 255 1674 1675 struct ext4_dir_entry { 1676 __le32 inode; /* Inode number */ 1677 __le16 rec_len; /* Directory entry length */ 1678 __le16 name_len; /* Name length */ 1679 char name[EXT4_NAME_LEN]; /* File name */ 1680 }; 1681 1682 /* 1683 * The new version of the directory entry. Since EXT4 structures are 1684 * stored in intel byte order, and the name_len field could never be 1685 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1686 * file_type field. 1687 */ 1688 struct ext4_dir_entry_2 { 1689 __le32 inode; /* Inode number */ 1690 __le16 rec_len; /* Directory entry length */ 1691 __u8 name_len; /* Name length */ 1692 __u8 file_type; 1693 char name[EXT4_NAME_LEN]; /* File name */ 1694 }; 1695 1696 /* 1697 * This is a bogus directory entry at the end of each leaf block that 1698 * records checksums. 1699 */ 1700 struct ext4_dir_entry_tail { 1701 __le32 det_reserved_zero1; /* Pretend to be unused */ 1702 __le16 det_rec_len; /* 12 */ 1703 __u8 det_reserved_zero2; /* Zero name length */ 1704 __u8 det_reserved_ft; /* 0xDE, fake file type */ 1705 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1706 }; 1707 1708 #define EXT4_DIRENT_TAIL(block, blocksize) \ 1709 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 1710 ((blocksize) - \ 1711 sizeof(struct ext4_dir_entry_tail)))) 1712 1713 /* 1714 * Ext4 directory file types. Only the low 3 bits are used. The 1715 * other bits are reserved for now. 1716 */ 1717 #define EXT4_FT_UNKNOWN 0 1718 #define EXT4_FT_REG_FILE 1 1719 #define EXT4_FT_DIR 2 1720 #define EXT4_FT_CHRDEV 3 1721 #define EXT4_FT_BLKDEV 4 1722 #define EXT4_FT_FIFO 5 1723 #define EXT4_FT_SOCK 6 1724 #define EXT4_FT_SYMLINK 7 1725 1726 #define EXT4_FT_MAX 8 1727 1728 #define EXT4_FT_DIR_CSUM 0xDE 1729 1730 /* 1731 * EXT4_DIR_PAD defines the directory entries boundaries 1732 * 1733 * NOTE: It must be a multiple of 4 1734 */ 1735 #define EXT4_DIR_PAD 4 1736 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1737 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1738 ~EXT4_DIR_ROUND) 1739 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1740 1741 /* 1742 * If we ever get support for fs block sizes > page_size, we'll need 1743 * to remove the #if statements in the next two functions... 1744 */ 1745 static inline unsigned int 1746 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1747 { 1748 unsigned len = le16_to_cpu(dlen); 1749 1750 #if (PAGE_CACHE_SIZE >= 65536) 1751 if (len == EXT4_MAX_REC_LEN || len == 0) 1752 return blocksize; 1753 return (len & 65532) | ((len & 3) << 16); 1754 #else 1755 return len; 1756 #endif 1757 } 1758 1759 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1760 { 1761 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1762 BUG(); 1763 #if (PAGE_CACHE_SIZE >= 65536) 1764 if (len < 65536) 1765 return cpu_to_le16(len); 1766 if (len == blocksize) { 1767 if (blocksize == 65536) 1768 return cpu_to_le16(EXT4_MAX_REC_LEN); 1769 else 1770 return cpu_to_le16(0); 1771 } 1772 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 1773 #else 1774 return cpu_to_le16(len); 1775 #endif 1776 } 1777 1778 /* 1779 * Hash Tree Directory indexing 1780 * (c) Daniel Phillips, 2001 1781 */ 1782 1783 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 1784 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 1785 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 1786 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 1787 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 1788 1789 /* Legal values for the dx_root hash_version field: */ 1790 1791 #define DX_HASH_LEGACY 0 1792 #define DX_HASH_HALF_MD4 1 1793 #define DX_HASH_TEA 2 1794 #define DX_HASH_LEGACY_UNSIGNED 3 1795 #define DX_HASH_HALF_MD4_UNSIGNED 4 1796 #define DX_HASH_TEA_UNSIGNED 5 1797 1798 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 1799 const void *address, unsigned int length) 1800 { 1801 struct { 1802 struct shash_desc shash; 1803 char ctx[4]; 1804 } desc; 1805 int err; 1806 1807 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 1808 1809 desc.shash.tfm = sbi->s_chksum_driver; 1810 desc.shash.flags = 0; 1811 *(u32 *)desc.ctx = crc; 1812 1813 err = crypto_shash_update(&desc.shash, address, length); 1814 BUG_ON(err); 1815 1816 return *(u32 *)desc.ctx; 1817 } 1818 1819 #ifdef __KERNEL__ 1820 1821 /* hash info structure used by the directory hash */ 1822 struct dx_hash_info 1823 { 1824 u32 hash; 1825 u32 minor_hash; 1826 int hash_version; 1827 u32 *seed; 1828 }; 1829 1830 1831 /* 32 and 64 bit signed EOF for dx directories */ 1832 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 1833 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 1834 1835 1836 /* 1837 * Control parameters used by ext4_htree_next_block 1838 */ 1839 #define HASH_NB_ALWAYS 1 1840 1841 1842 /* 1843 * Describe an inode's exact location on disk and in memory 1844 */ 1845 struct ext4_iloc 1846 { 1847 struct buffer_head *bh; 1848 unsigned long offset; 1849 ext4_group_t block_group; 1850 }; 1851 1852 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 1853 { 1854 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 1855 } 1856 1857 /* 1858 * This structure is stuffed into the struct file's private_data field 1859 * for directories. It is where we put information so that we can do 1860 * readdir operations in hash tree order. 1861 */ 1862 struct dir_private_info { 1863 struct rb_root root; 1864 struct rb_node *curr_node; 1865 struct fname *extra_fname; 1866 loff_t last_pos; 1867 __u32 curr_hash; 1868 __u32 curr_minor_hash; 1869 __u32 next_hash; 1870 }; 1871 1872 /* calculate the first block number of the group */ 1873 static inline ext4_fsblk_t 1874 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 1875 { 1876 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 1877 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 1878 } 1879 1880 /* 1881 * Special error return code only used by dx_probe() and its callers. 1882 */ 1883 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 1884 1885 /* 1886 * Timeout and state flag for lazy initialization inode thread. 1887 */ 1888 #define EXT4_DEF_LI_WAIT_MULT 10 1889 #define EXT4_DEF_LI_MAX_START_DELAY 5 1890 #define EXT4_LAZYINIT_QUIT 0x0001 1891 #define EXT4_LAZYINIT_RUNNING 0x0002 1892 1893 /* 1894 * Lazy inode table initialization info 1895 */ 1896 struct ext4_lazy_init { 1897 unsigned long li_state; 1898 struct list_head li_request_list; 1899 struct mutex li_list_mtx; 1900 }; 1901 1902 struct ext4_li_request { 1903 struct super_block *lr_super; 1904 struct ext4_sb_info *lr_sbi; 1905 ext4_group_t lr_next_group; 1906 struct list_head lr_request; 1907 unsigned long lr_next_sched; 1908 unsigned long lr_timeout; 1909 }; 1910 1911 struct ext4_features { 1912 struct kobject f_kobj; 1913 struct completion f_kobj_unregister; 1914 }; 1915 1916 /* 1917 * This structure will be used for multiple mount protection. It will be 1918 * written into the block number saved in the s_mmp_block field in the 1919 * superblock. Programs that check MMP should assume that if 1920 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 1921 * to use the filesystem, regardless of how old the timestamp is. 1922 */ 1923 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 1924 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 1925 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 1926 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 1927 1928 struct mmp_struct { 1929 __le32 mmp_magic; /* Magic number for MMP */ 1930 __le32 mmp_seq; /* Sequence no. updated periodically */ 1931 1932 /* 1933 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 1934 * purposes and do not affect the correctness of the algorithm 1935 */ 1936 __le64 mmp_time; /* Time last updated */ 1937 char mmp_nodename[64]; /* Node which last updated MMP block */ 1938 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 1939 1940 /* 1941 * mmp_check_interval is used to verify if the MMP block has been 1942 * updated on the block device. The value is updated based on the 1943 * maximum time to write the MMP block during an update cycle. 1944 */ 1945 __le16 mmp_check_interval; 1946 1947 __le16 mmp_pad1; 1948 __le32 mmp_pad2[226]; 1949 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 1950 }; 1951 1952 /* arguments passed to the mmp thread */ 1953 struct mmpd_data { 1954 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 1955 struct super_block *sb; /* super block of the fs */ 1956 }; 1957 1958 /* 1959 * Check interval multiplier 1960 * The MMP block is written every update interval and initially checked every 1961 * update interval x the multiplier (the value is then adapted based on the 1962 * write latency). The reason is that writes can be delayed under load and we 1963 * don't want readers to incorrectly assume that the filesystem is no longer 1964 * in use. 1965 */ 1966 #define EXT4_MMP_CHECK_MULT 2UL 1967 1968 /* 1969 * Minimum interval for MMP checking in seconds. 1970 */ 1971 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 1972 1973 /* 1974 * Maximum interval for MMP checking in seconds. 1975 */ 1976 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 1977 1978 /* 1979 * Function prototypes 1980 */ 1981 1982 /* 1983 * Ok, these declarations are also in <linux/kernel.h> but none of the 1984 * ext4 source programs needs to include it so they are duplicated here. 1985 */ 1986 # define NORET_TYPE /**/ 1987 # define ATTRIB_NORET __attribute__((noreturn)) 1988 # define NORET_AND noreturn, 1989 1990 /* bitmap.c */ 1991 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 1992 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 1993 struct ext4_group_desc *gdp, 1994 struct buffer_head *bh, int sz); 1995 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 1996 struct ext4_group_desc *gdp, 1997 struct buffer_head *bh, int sz); 1998 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 1999 struct ext4_group_desc *gdp, 2000 struct buffer_head *bh); 2001 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2002 struct ext4_group_desc *gdp, 2003 struct buffer_head *bh); 2004 2005 /* balloc.c */ 2006 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2007 ext4_fsblk_t blocknr, 2008 ext4_group_t *blockgrpp, 2009 ext4_grpblk_t *offsetp); 2010 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2011 ext4_fsblk_t block); 2012 2013 extern unsigned int ext4_block_group(struct super_block *sb, 2014 ext4_fsblk_t blocknr); 2015 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2016 ext4_fsblk_t blocknr); 2017 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2018 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2019 ext4_group_t group); 2020 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2021 ext4_fsblk_t goal, 2022 unsigned int flags, 2023 unsigned long *count, 2024 int *errp); 2025 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2026 s64 nclusters, unsigned int flags); 2027 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2028 extern void ext4_check_blocks_bitmap(struct super_block *); 2029 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2030 ext4_group_t block_group, 2031 struct buffer_head ** bh); 2032 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2033 2034 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2035 ext4_group_t block_group); 2036 extern int ext4_wait_block_bitmap(struct super_block *sb, 2037 ext4_group_t block_group, 2038 struct buffer_head *bh); 2039 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2040 ext4_group_t block_group); 2041 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2042 ext4_group_t block_group, 2043 struct ext4_group_desc *gdp); 2044 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2045 2046 /* crypto_policy.c */ 2047 int ext4_is_child_context_consistent_with_parent(struct inode *parent, 2048 struct inode *child); 2049 int ext4_inherit_context(struct inode *parent, struct inode *child); 2050 void ext4_to_hex(char *dst, char *src, size_t src_size); 2051 int ext4_process_policy(const struct ext4_encryption_policy *policy, 2052 struct inode *inode); 2053 int ext4_get_policy(struct inode *inode, 2054 struct ext4_encryption_policy *policy); 2055 2056 /* crypto.c */ 2057 bool ext4_valid_contents_enc_mode(uint32_t mode); 2058 uint32_t ext4_validate_encryption_key_size(uint32_t mode, uint32_t size); 2059 extern struct workqueue_struct *ext4_read_workqueue; 2060 struct ext4_crypto_ctx *ext4_get_crypto_ctx(struct inode *inode); 2061 void ext4_release_crypto_ctx(struct ext4_crypto_ctx *ctx); 2062 void ext4_restore_control_page(struct page *data_page); 2063 struct page *ext4_encrypt(struct inode *inode, 2064 struct page *plaintext_page); 2065 int ext4_decrypt(struct ext4_crypto_ctx *ctx, struct page *page); 2066 int ext4_decrypt_one(struct inode *inode, struct page *page); 2067 int ext4_encrypted_zeroout(struct inode *inode, struct ext4_extent *ex); 2068 2069 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2070 int ext4_init_crypto(void); 2071 void ext4_exit_crypto(void); 2072 static inline int ext4_sb_has_crypto(struct super_block *sb) 2073 { 2074 return EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT); 2075 } 2076 #else 2077 static inline int ext4_init_crypto(void) { return 0; } 2078 static inline void ext4_exit_crypto(void) { } 2079 static inline int ext4_sb_has_crypto(struct super_block *sb) 2080 { 2081 return 0; 2082 } 2083 #endif 2084 2085 /* crypto_fname.c */ 2086 bool ext4_valid_filenames_enc_mode(uint32_t mode); 2087 u32 ext4_fname_crypto_round_up(u32 size, u32 blksize); 2088 int ext4_fname_crypto_alloc_buffer(struct ext4_fname_crypto_ctx *ctx, 2089 u32 ilen, struct ext4_str *crypto_str); 2090 int _ext4_fname_disk_to_usr(struct ext4_fname_crypto_ctx *ctx, 2091 struct dx_hash_info *hinfo, 2092 const struct ext4_str *iname, 2093 struct ext4_str *oname); 2094 int ext4_fname_disk_to_usr(struct ext4_fname_crypto_ctx *ctx, 2095 struct dx_hash_info *hinfo, 2096 const struct ext4_dir_entry_2 *de, 2097 struct ext4_str *oname); 2098 int ext4_fname_usr_to_disk(struct ext4_fname_crypto_ctx *ctx, 2099 const struct qstr *iname, 2100 struct ext4_str *oname); 2101 int ext4_fname_usr_to_hash(struct ext4_fname_crypto_ctx *ctx, 2102 const struct qstr *iname, 2103 struct dx_hash_info *hinfo); 2104 int ext4_fname_crypto_namelen_on_disk(struct ext4_fname_crypto_ctx *ctx, 2105 u32 namelen); 2106 int ext4_fname_match(struct ext4_fname_crypto_ctx *ctx, struct ext4_str *cstr, 2107 int len, const char * const name, 2108 struct ext4_dir_entry_2 *de); 2109 2110 2111 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2112 void ext4_put_fname_crypto_ctx(struct ext4_fname_crypto_ctx **ctx); 2113 struct ext4_fname_crypto_ctx *ext4_get_fname_crypto_ctx(struct inode *inode, 2114 u32 max_len); 2115 void ext4_fname_crypto_free_buffer(struct ext4_str *crypto_str); 2116 #else 2117 static inline 2118 void ext4_put_fname_crypto_ctx(struct ext4_fname_crypto_ctx **ctx) { } 2119 static inline 2120 struct ext4_fname_crypto_ctx *ext4_get_fname_crypto_ctx(struct inode *inode, 2121 u32 max_len) 2122 { 2123 return NULL; 2124 } 2125 static inline void ext4_fname_crypto_free_buffer(struct ext4_str *p) { } 2126 #endif 2127 2128 2129 /* crypto_key.c */ 2130 int ext4_generate_encryption_key(struct inode *inode); 2131 2132 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2133 int ext4_has_encryption_key(struct inode *inode); 2134 #else 2135 static inline int ext4_has_encryption_key(struct inode *inode) 2136 { 2137 return 0; 2138 } 2139 #endif 2140 2141 2142 /* dir.c */ 2143 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2144 struct file *, 2145 struct ext4_dir_entry_2 *, 2146 struct buffer_head *, char *, int, 2147 unsigned int); 2148 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2149 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2150 (de), (bh), (buf), (size), (offset))) 2151 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2152 __u32 minor_hash, 2153 struct ext4_dir_entry_2 *dirent, 2154 struct ext4_str *ent_name); 2155 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2156 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2157 struct buffer_head *bh, 2158 void *buf, int buf_size, 2159 const char *name, int namelen, 2160 struct ext4_dir_entry_2 **dest_de); 2161 int ext4_insert_dentry(struct inode *dir, 2162 struct inode *inode, 2163 struct ext4_dir_entry_2 *de, 2164 int buf_size, 2165 const struct qstr *iname, 2166 const char *name, int namelen); 2167 static inline void ext4_update_dx_flag(struct inode *inode) 2168 { 2169 if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb, 2170 EXT4_FEATURE_COMPAT_DIR_INDEX)) 2171 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2172 } 2173 static unsigned char ext4_filetype_table[] = { 2174 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2175 }; 2176 2177 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2178 { 2179 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE) || 2180 (filetype >= EXT4_FT_MAX)) 2181 return DT_UNKNOWN; 2182 2183 return ext4_filetype_table[filetype]; 2184 } 2185 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2186 void *buf, int buf_size); 2187 2188 /* fsync.c */ 2189 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2190 2191 /* hash.c */ 2192 extern int ext4fs_dirhash(const char *name, int len, struct 2193 dx_hash_info *hinfo); 2194 2195 /* ialloc.c */ 2196 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2197 const struct qstr *qstr, __u32 goal, 2198 uid_t *owner, int handle_type, 2199 unsigned int line_no, int nblocks); 2200 2201 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \ 2202 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2203 0, 0, 0) 2204 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2205 type, nblocks) \ 2206 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2207 (type), __LINE__, (nblocks)) 2208 2209 2210 extern void ext4_free_inode(handle_t *, struct inode *); 2211 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2212 extern unsigned long ext4_count_free_inodes(struct super_block *); 2213 extern unsigned long ext4_count_dirs(struct super_block *); 2214 extern void ext4_check_inodes_bitmap(struct super_block *); 2215 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2216 extern int ext4_init_inode_table(struct super_block *sb, 2217 ext4_group_t group, int barrier); 2218 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2219 2220 /* mballoc.c */ 2221 extern long ext4_mb_stats; 2222 extern long ext4_mb_max_to_scan; 2223 extern int ext4_mb_init(struct super_block *); 2224 extern int ext4_mb_release(struct super_block *); 2225 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2226 struct ext4_allocation_request *, int *); 2227 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2228 extern void ext4_discard_preallocations(struct inode *); 2229 extern int __init ext4_init_mballoc(void); 2230 extern void ext4_exit_mballoc(void); 2231 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2232 struct buffer_head *bh, ext4_fsblk_t block, 2233 unsigned long count, int flags); 2234 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2235 ext4_group_t ngroups); 2236 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2237 ext4_group_t i, struct ext4_group_desc *desc); 2238 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2239 ext4_fsblk_t block, unsigned long count); 2240 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2241 2242 /* inode.c */ 2243 int ext4_inode_is_fast_symlink(struct inode *inode); 2244 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2245 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2246 int ext4_get_block_write(struct inode *inode, sector_t iblock, 2247 struct buffer_head *bh_result, int create); 2248 int ext4_get_block(struct inode *inode, sector_t iblock, 2249 struct buffer_head *bh_result, int create); 2250 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2251 struct buffer_head *bh, int create); 2252 int ext4_walk_page_buffers(handle_t *handle, 2253 struct buffer_head *head, 2254 unsigned from, 2255 unsigned to, 2256 int *partial, 2257 int (*fn)(handle_t *handle, 2258 struct buffer_head *bh)); 2259 int do_journal_get_write_access(handle_t *handle, 2260 struct buffer_head *bh); 2261 #define FALL_BACK_TO_NONDELALLOC 1 2262 #define CONVERT_INLINE_DATA 2 2263 2264 extern struct inode *ext4_iget(struct super_block *, unsigned long); 2265 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long); 2266 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2267 extern int ext4_setattr(struct dentry *, struct iattr *); 2268 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 2269 struct kstat *stat); 2270 extern void ext4_evict_inode(struct inode *); 2271 extern void ext4_clear_inode(struct inode *); 2272 extern int ext4_sync_inode(handle_t *, struct inode *); 2273 extern void ext4_dirty_inode(struct inode *, int); 2274 extern int ext4_change_inode_journal_flag(struct inode *, int); 2275 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2276 extern int ext4_inode_attach_jinode(struct inode *inode); 2277 extern int ext4_can_truncate(struct inode *inode); 2278 extern void ext4_truncate(struct inode *); 2279 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2280 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 2281 extern void ext4_set_inode_flags(struct inode *); 2282 extern void ext4_get_inode_flags(struct ext4_inode_info *); 2283 extern int ext4_alloc_da_blocks(struct inode *inode); 2284 extern void ext4_set_aops(struct inode *inode); 2285 extern int ext4_writepage_trans_blocks(struct inode *); 2286 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2287 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2288 loff_t lstart, loff_t lend); 2289 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 2290 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2291 extern void ext4_da_update_reserve_space(struct inode *inode, 2292 int used, int quota_claim); 2293 2294 /* indirect.c */ 2295 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2296 struct ext4_map_blocks *map, int flags); 2297 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb, 2298 struct iov_iter *iter, loff_t offset); 2299 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2300 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2301 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2302 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2303 ext4_lblk_t start, ext4_lblk_t end); 2304 2305 /* ioctl.c */ 2306 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2307 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2308 2309 /* migrate.c */ 2310 extern int ext4_ext_migrate(struct inode *); 2311 extern int ext4_ind_migrate(struct inode *inode); 2312 2313 /* namei.c */ 2314 extern int ext4_dirent_csum_verify(struct inode *inode, 2315 struct ext4_dir_entry *dirent); 2316 extern int ext4_orphan_add(handle_t *, struct inode *); 2317 extern int ext4_orphan_del(handle_t *, struct inode *); 2318 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2319 __u32 start_minor_hash, __u32 *next_hash); 2320 extern int search_dir(struct buffer_head *bh, 2321 char *search_buf, 2322 int buf_size, 2323 struct inode *dir, 2324 const struct qstr *d_name, 2325 unsigned int offset, 2326 struct ext4_dir_entry_2 **res_dir); 2327 extern int ext4_generic_delete_entry(handle_t *handle, 2328 struct inode *dir, 2329 struct ext4_dir_entry_2 *de_del, 2330 struct buffer_head *bh, 2331 void *entry_buf, 2332 int buf_size, 2333 int csum_size); 2334 extern int ext4_empty_dir(struct inode *inode); 2335 2336 /* resize.c */ 2337 extern int ext4_group_add(struct super_block *sb, 2338 struct ext4_new_group_data *input); 2339 extern int ext4_group_extend(struct super_block *sb, 2340 struct ext4_super_block *es, 2341 ext4_fsblk_t n_blocks_count); 2342 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2343 2344 /* super.c */ 2345 extern int ext4_calculate_overhead(struct super_block *sb); 2346 extern void ext4_superblock_csum_set(struct super_block *sb); 2347 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 2348 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 2349 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2350 ext4_group_t ngroup); 2351 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2352 char nbuf[16]); 2353 2354 extern __printf(4, 5) 2355 void __ext4_error(struct super_block *, const char *, unsigned int, 2356 const char *, ...); 2357 extern __printf(5, 6) 2358 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2359 const char *, ...); 2360 extern __printf(5, 6) 2361 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2362 const char *, ...); 2363 extern void __ext4_std_error(struct super_block *, const char *, 2364 unsigned int, int); 2365 extern __printf(4, 5) 2366 void __ext4_abort(struct super_block *, const char *, unsigned int, 2367 const char *, ...); 2368 extern __printf(4, 5) 2369 void __ext4_warning(struct super_block *, const char *, unsigned int, 2370 const char *, ...); 2371 extern __printf(3, 4) 2372 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2373 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2374 const char *, unsigned int, const char *); 2375 extern __printf(7, 8) 2376 void __ext4_grp_locked_error(const char *, unsigned int, 2377 struct super_block *, ext4_group_t, 2378 unsigned long, ext4_fsblk_t, 2379 const char *, ...); 2380 2381 #ifdef CONFIG_PRINTK 2382 2383 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2384 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__) 2385 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2386 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2387 #define ext4_error(sb, fmt, ...) \ 2388 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2389 #define ext4_abort(sb, fmt, ...) \ 2390 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2391 #define ext4_warning(sb, fmt, ...) \ 2392 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2393 #define ext4_msg(sb, level, fmt, ...) \ 2394 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 2395 #define dump_mmp_msg(sb, mmp, msg) \ 2396 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 2397 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2398 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 2399 fmt, ##__VA_ARGS__) 2400 2401 #else 2402 2403 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2404 do { \ 2405 no_printk(fmt, ##__VA_ARGS__); \ 2406 __ext4_error_inode(inode, "", 0, block, " "); \ 2407 } while (0) 2408 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2409 do { \ 2410 no_printk(fmt, ##__VA_ARGS__); \ 2411 __ext4_error_file(file, "", 0, block, " "); \ 2412 } while (0) 2413 #define ext4_error(sb, fmt, ...) \ 2414 do { \ 2415 no_printk(fmt, ##__VA_ARGS__); \ 2416 __ext4_error(sb, "", 0, " "); \ 2417 } while (0) 2418 #define ext4_abort(sb, fmt, ...) \ 2419 do { \ 2420 no_printk(fmt, ##__VA_ARGS__); \ 2421 __ext4_abort(sb, "", 0, " "); \ 2422 } while (0) 2423 #define ext4_warning(sb, fmt, ...) \ 2424 do { \ 2425 no_printk(fmt, ##__VA_ARGS__); \ 2426 __ext4_warning(sb, "", 0, " "); \ 2427 } while (0) 2428 #define ext4_msg(sb, level, fmt, ...) \ 2429 do { \ 2430 no_printk(fmt, ##__VA_ARGS__); \ 2431 __ext4_msg(sb, "", " "); \ 2432 } while (0) 2433 #define dump_mmp_msg(sb, mmp, msg) \ 2434 __dump_mmp_msg(sb, mmp, "", 0, "") 2435 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2436 do { \ 2437 no_printk(fmt, ##__VA_ARGS__); \ 2438 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 2439 } while (0) 2440 2441 #endif 2442 2443 extern void ext4_update_dynamic_rev(struct super_block *sb); 2444 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2445 __u32 compat); 2446 extern int ext4_update_rocompat_feature(handle_t *handle, 2447 struct super_block *sb, __u32 rocompat); 2448 extern int ext4_update_incompat_feature(handle_t *handle, 2449 struct super_block *sb, __u32 incompat); 2450 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2451 struct ext4_group_desc *bg); 2452 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2453 struct ext4_group_desc *bg); 2454 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2455 struct ext4_group_desc *bg); 2456 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2457 struct ext4_group_desc *bg); 2458 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2459 struct ext4_group_desc *bg); 2460 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2461 struct ext4_group_desc *bg); 2462 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2463 struct ext4_group_desc *bg); 2464 extern void ext4_block_bitmap_set(struct super_block *sb, 2465 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2466 extern void ext4_inode_bitmap_set(struct super_block *sb, 2467 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2468 extern void ext4_inode_table_set(struct super_block *sb, 2469 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2470 extern void ext4_free_group_clusters_set(struct super_block *sb, 2471 struct ext4_group_desc *bg, 2472 __u32 count); 2473 extern void ext4_free_inodes_set(struct super_block *sb, 2474 struct ext4_group_desc *bg, __u32 count); 2475 extern void ext4_used_dirs_set(struct super_block *sb, 2476 struct ext4_group_desc *bg, __u32 count); 2477 extern void ext4_itable_unused_set(struct super_block *sb, 2478 struct ext4_group_desc *bg, __u32 count); 2479 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2480 struct ext4_group_desc *gdp); 2481 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2482 struct ext4_group_desc *gdp); 2483 extern int ext4_register_li_request(struct super_block *sb, 2484 ext4_group_t first_not_zeroed); 2485 2486 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2487 { 2488 return EXT4_HAS_RO_COMPAT_FEATURE(sb, 2489 EXT4_FEATURE_RO_COMPAT_GDT_CSUM) || 2490 (EXT4_SB(sb)->s_chksum_driver != NULL); 2491 } 2492 2493 static inline int ext4_has_metadata_csum(struct super_block *sb) 2494 { 2495 WARN_ON_ONCE(EXT4_HAS_RO_COMPAT_FEATURE(sb, 2496 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) && 2497 !EXT4_SB(sb)->s_chksum_driver); 2498 2499 return (EXT4_SB(sb)->s_chksum_driver != NULL); 2500 } 2501 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2502 { 2503 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2504 le32_to_cpu(es->s_blocks_count_lo); 2505 } 2506 2507 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2508 { 2509 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2510 le32_to_cpu(es->s_r_blocks_count_lo); 2511 } 2512 2513 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2514 { 2515 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2516 le32_to_cpu(es->s_free_blocks_count_lo); 2517 } 2518 2519 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2520 ext4_fsblk_t blk) 2521 { 2522 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2523 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2524 } 2525 2526 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2527 ext4_fsblk_t blk) 2528 { 2529 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2530 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2531 } 2532 2533 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2534 ext4_fsblk_t blk) 2535 { 2536 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2537 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2538 } 2539 2540 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 2541 { 2542 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2543 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2544 le32_to_cpu(raw_inode->i_size_lo); 2545 else 2546 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2547 } 2548 2549 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2550 { 2551 raw_inode->i_size_lo = cpu_to_le32(i_size); 2552 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2553 } 2554 2555 static inline 2556 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2557 ext4_group_t group) 2558 { 2559 struct ext4_group_info ***grp_info; 2560 long indexv, indexh; 2561 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 2562 grp_info = EXT4_SB(sb)->s_group_info; 2563 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2564 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2565 return grp_info[indexv][indexh]; 2566 } 2567 2568 /* 2569 * Reading s_groups_count requires using smp_rmb() afterwards. See 2570 * the locking protocol documented in the comments of ext4_group_add() 2571 * in resize.c 2572 */ 2573 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2574 { 2575 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2576 2577 smp_rmb(); 2578 return ngroups; 2579 } 2580 2581 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2582 ext4_group_t block_group) 2583 { 2584 return block_group >> sbi->s_log_groups_per_flex; 2585 } 2586 2587 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2588 { 2589 return 1 << sbi->s_log_groups_per_flex; 2590 } 2591 2592 #define ext4_std_error(sb, errno) \ 2593 do { \ 2594 if ((errno)) \ 2595 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2596 } while (0) 2597 2598 #ifdef CONFIG_SMP 2599 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2600 * counters. So we need to make sure we have free clusters more 2601 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2602 */ 2603 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2604 #else 2605 #define EXT4_FREECLUSTERS_WATERMARK 0 2606 #endif 2607 2608 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 2609 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2610 { 2611 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 2612 !mutex_is_locked(&inode->i_mutex)); 2613 down_write(&EXT4_I(inode)->i_data_sem); 2614 if (newsize > EXT4_I(inode)->i_disksize) 2615 EXT4_I(inode)->i_disksize = newsize; 2616 up_write(&EXT4_I(inode)->i_data_sem); 2617 } 2618 2619 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 2620 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 2621 { 2622 int changed = 0; 2623 2624 if (newsize > inode->i_size) { 2625 i_size_write(inode, newsize); 2626 changed = 1; 2627 } 2628 if (newsize > EXT4_I(inode)->i_disksize) { 2629 ext4_update_i_disksize(inode, newsize); 2630 changed |= 2; 2631 } 2632 return changed; 2633 } 2634 2635 struct ext4_group_info { 2636 unsigned long bb_state; 2637 struct rb_root bb_free_root; 2638 ext4_grpblk_t bb_first_free; /* first free block */ 2639 ext4_grpblk_t bb_free; /* total free blocks */ 2640 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 2641 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 2642 struct list_head bb_prealloc_list; 2643 #ifdef DOUBLE_CHECK 2644 void *bb_bitmap; 2645 #endif 2646 struct rw_semaphore alloc_sem; 2647 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2648 * regions, index is order. 2649 * bb_counters[3] = 5 means 2650 * 5 free 8-block regions. */ 2651 }; 2652 2653 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 2654 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 2655 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 2656 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 2657 2658 #define EXT4_MB_GRP_NEED_INIT(grp) \ 2659 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 2660 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 2661 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2662 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 2663 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2664 2665 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 2666 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2667 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 2668 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2669 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 2670 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2671 2672 #define EXT4_MAX_CONTENTION 8 2673 #define EXT4_CONTENTION_THRESHOLD 2 2674 2675 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2676 ext4_group_t group) 2677 { 2678 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2679 } 2680 2681 /* 2682 * Returns true if the filesystem is busy enough that attempts to 2683 * access the block group locks has run into contention. 2684 */ 2685 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 2686 { 2687 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 2688 } 2689 2690 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 2691 { 2692 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 2693 if (spin_trylock(lock)) 2694 /* 2695 * We're able to grab the lock right away, so drop the 2696 * lock contention counter. 2697 */ 2698 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 2699 else { 2700 /* 2701 * The lock is busy, so bump the contention counter, 2702 * and then wait on the spin lock. 2703 */ 2704 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 2705 EXT4_MAX_CONTENTION); 2706 spin_lock(lock); 2707 } 2708 } 2709 2710 static inline void ext4_unlock_group(struct super_block *sb, 2711 ext4_group_t group) 2712 { 2713 spin_unlock(ext4_group_lock_ptr(sb, group)); 2714 } 2715 2716 /* 2717 * Block validity checking 2718 */ 2719 #define ext4_check_indirect_blockref(inode, bh) \ 2720 ext4_check_blockref(__func__, __LINE__, inode, \ 2721 (__le32 *)(bh)->b_data, \ 2722 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 2723 2724 #define ext4_ind_check_inode(inode) \ 2725 ext4_check_blockref(__func__, __LINE__, inode, \ 2726 EXT4_I(inode)->i_data, \ 2727 EXT4_NDIR_BLOCKS) 2728 2729 /* 2730 * Inodes and files operations 2731 */ 2732 2733 /* dir.c */ 2734 extern const struct file_operations ext4_dir_operations; 2735 2736 /* file.c */ 2737 extern const struct inode_operations ext4_file_inode_operations; 2738 extern const struct file_operations ext4_file_operations; 2739 extern const struct file_operations ext4_dax_file_operations; 2740 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 2741 2742 /* inline.c */ 2743 extern int ext4_get_max_inline_size(struct inode *inode); 2744 extern int ext4_find_inline_data_nolock(struct inode *inode); 2745 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 2746 unsigned int len); 2747 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 2748 2749 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 2750 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 2751 struct inode *inode, 2752 loff_t pos, unsigned len, 2753 unsigned flags, 2754 struct page **pagep); 2755 extern int ext4_write_inline_data_end(struct inode *inode, 2756 loff_t pos, unsigned len, 2757 unsigned copied, 2758 struct page *page); 2759 extern struct buffer_head * 2760 ext4_journalled_write_inline_data(struct inode *inode, 2761 unsigned len, 2762 struct page *page); 2763 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 2764 struct inode *inode, 2765 loff_t pos, unsigned len, 2766 unsigned flags, 2767 struct page **pagep, 2768 void **fsdata); 2769 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 2770 unsigned len, unsigned copied, 2771 struct page *page); 2772 extern int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry, 2773 struct inode *inode); 2774 extern int ext4_try_create_inline_dir(handle_t *handle, 2775 struct inode *parent, 2776 struct inode *inode); 2777 extern int ext4_read_inline_dir(struct file *filp, 2778 struct dir_context *ctx, 2779 int *has_inline_data); 2780 extern int htree_inlinedir_to_tree(struct file *dir_file, 2781 struct inode *dir, ext4_lblk_t block, 2782 struct dx_hash_info *hinfo, 2783 __u32 start_hash, __u32 start_minor_hash, 2784 int *has_inline_data); 2785 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 2786 const struct qstr *d_name, 2787 struct ext4_dir_entry_2 **res_dir, 2788 int *has_inline_data); 2789 extern int ext4_delete_inline_entry(handle_t *handle, 2790 struct inode *dir, 2791 struct ext4_dir_entry_2 *de_del, 2792 struct buffer_head *bh, 2793 int *has_inline_data); 2794 extern int empty_inline_dir(struct inode *dir, int *has_inline_data); 2795 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 2796 struct ext4_dir_entry_2 **parent_de, 2797 int *retval); 2798 extern int ext4_inline_data_fiemap(struct inode *inode, 2799 struct fiemap_extent_info *fieinfo, 2800 int *has_inline, __u64 start, __u64 len); 2801 extern int ext4_try_to_evict_inline_data(handle_t *handle, 2802 struct inode *inode, 2803 int needed); 2804 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline); 2805 2806 extern int ext4_convert_inline_data(struct inode *inode); 2807 2808 static inline int ext4_has_inline_data(struct inode *inode) 2809 { 2810 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 2811 EXT4_I(inode)->i_inline_off; 2812 } 2813 2814 /* namei.c */ 2815 extern const struct inode_operations ext4_dir_inode_operations; 2816 extern const struct inode_operations ext4_special_inode_operations; 2817 extern struct dentry *ext4_get_parent(struct dentry *child); 2818 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 2819 struct ext4_dir_entry_2 *de, 2820 int blocksize, int csum_size, 2821 unsigned int parent_ino, int dotdot_real_len); 2822 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t, 2823 unsigned int blocksize); 2824 extern int ext4_handle_dirty_dirent_node(handle_t *handle, 2825 struct inode *inode, 2826 struct buffer_head *bh); 2827 #define S_SHIFT 12 2828 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = { 2829 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 2830 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 2831 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 2832 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 2833 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 2834 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 2835 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 2836 }; 2837 2838 static inline void ext4_set_de_type(struct super_block *sb, 2839 struct ext4_dir_entry_2 *de, 2840 umode_t mode) { 2841 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE)) 2842 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 2843 } 2844 2845 /* readpages.c */ 2846 extern int ext4_mpage_readpages(struct address_space *mapping, 2847 struct list_head *pages, struct page *page, 2848 unsigned nr_pages); 2849 2850 /* symlink.c */ 2851 extern const struct inode_operations ext4_symlink_inode_operations; 2852 extern const struct inode_operations ext4_fast_symlink_inode_operations; 2853 2854 /* block_validity */ 2855 extern void ext4_release_system_zone(struct super_block *sb); 2856 extern int ext4_setup_system_zone(struct super_block *sb); 2857 extern int __init ext4_init_system_zone(void); 2858 extern void ext4_exit_system_zone(void); 2859 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 2860 ext4_fsblk_t start_blk, 2861 unsigned int count); 2862 extern int ext4_check_blockref(const char *, unsigned int, 2863 struct inode *, __le32 *, unsigned int); 2864 2865 /* extents.c */ 2866 struct ext4_ext_path; 2867 struct ext4_extent; 2868 2869 /* 2870 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 2871 * __le32. 2872 */ 2873 #define EXT_MAX_BLOCKS 0xffffffff 2874 2875 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 2876 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 2877 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 2878 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 2879 struct ext4_map_blocks *map, int flags); 2880 extern void ext4_ext_truncate(handle_t *, struct inode *); 2881 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 2882 ext4_lblk_t end); 2883 extern void ext4_ext_init(struct super_block *); 2884 extern void ext4_ext_release(struct super_block *); 2885 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 2886 loff_t len); 2887 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 2888 loff_t offset, ssize_t len); 2889 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 2890 struct ext4_map_blocks *map, int flags); 2891 extern int ext4_ext_calc_metadata_amount(struct inode *inode, 2892 ext4_lblk_t lblocks); 2893 extern int ext4_extent_tree_init(handle_t *, struct inode *); 2894 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 2895 int num, 2896 struct ext4_ext_path *path); 2897 extern int ext4_can_extents_be_merged(struct inode *inode, 2898 struct ext4_extent *ex1, 2899 struct ext4_extent *ex2); 2900 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 2901 struct ext4_ext_path **, 2902 struct ext4_extent *, int); 2903 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 2904 struct ext4_ext_path **, 2905 int flags); 2906 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 2907 extern int ext4_ext_check_inode(struct inode *inode); 2908 extern int ext4_find_delalloc_range(struct inode *inode, 2909 ext4_lblk_t lblk_start, 2910 ext4_lblk_t lblk_end); 2911 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk); 2912 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 2913 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2914 __u64 start, __u64 len); 2915 extern int ext4_ext_precache(struct inode *inode); 2916 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len); 2917 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 2918 struct inode *inode2, ext4_lblk_t lblk1, 2919 ext4_lblk_t lblk2, ext4_lblk_t count, 2920 int mark_unwritten,int *err); 2921 2922 /* move_extent.c */ 2923 extern void ext4_double_down_write_data_sem(struct inode *first, 2924 struct inode *second); 2925 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 2926 struct inode *donor_inode); 2927 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 2928 __u64 start_orig, __u64 start_donor, 2929 __u64 len, __u64 *moved_len); 2930 2931 /* page-io.c */ 2932 extern int __init ext4_init_pageio(void); 2933 extern void ext4_exit_pageio(void); 2934 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 2935 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 2936 extern int ext4_put_io_end(ext4_io_end_t *io_end); 2937 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 2938 extern void ext4_io_submit_init(struct ext4_io_submit *io, 2939 struct writeback_control *wbc); 2940 extern void ext4_end_io_rsv_work(struct work_struct *work); 2941 extern void ext4_io_submit(struct ext4_io_submit *io); 2942 extern int ext4_bio_write_page(struct ext4_io_submit *io, 2943 struct page *page, 2944 int len, 2945 struct writeback_control *wbc, 2946 bool keep_towrite); 2947 2948 /* mmp.c */ 2949 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 2950 2951 /* 2952 * Add new method to test whether block and inode bitmaps are properly 2953 * initialized. With uninit_bg reading the block from disk is not enough 2954 * to mark the bitmap uptodate. We need to also zero-out the bitmap 2955 */ 2956 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 2957 2958 static inline int bitmap_uptodate(struct buffer_head *bh) 2959 { 2960 return (buffer_uptodate(bh) && 2961 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 2962 } 2963 static inline void set_bitmap_uptodate(struct buffer_head *bh) 2964 { 2965 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 2966 } 2967 2968 /* 2969 * Disable DIO read nolock optimization, so new dioreaders will be forced 2970 * to grab i_mutex 2971 */ 2972 static inline void ext4_inode_block_unlocked_dio(struct inode *inode) 2973 { 2974 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 2975 smp_mb(); 2976 } 2977 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode) 2978 { 2979 smp_mb(); 2980 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 2981 } 2982 2983 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 2984 2985 /* For ioend & aio unwritten conversion wait queues */ 2986 #define EXT4_WQ_HASH_SZ 37 2987 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 2988 EXT4_WQ_HASH_SZ]) 2989 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\ 2990 EXT4_WQ_HASH_SZ]) 2991 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 2992 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; 2993 2994 #define EXT4_RESIZING 0 2995 extern int ext4_resize_begin(struct super_block *sb); 2996 extern void ext4_resize_end(struct super_block *sb); 2997 2998 #endif /* __KERNEL__ */ 2999 3000 #endif /* _EXT4_H */ 3001