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 /* data type for block offset of block group */ 73 typedef int ext4_grpblk_t; 74 75 /* data type for filesystem-wide blocks number */ 76 typedef unsigned long long ext4_fsblk_t; 77 78 /* data type for file logical block number */ 79 typedef __u32 ext4_lblk_t; 80 81 /* data type for block group number */ 82 typedef unsigned int ext4_group_t; 83 84 enum SHIFT_DIRECTION { 85 SHIFT_LEFT = 0, 86 SHIFT_RIGHT, 87 }; 88 89 /* 90 * Flags used in mballoc's allocation_context flags field. 91 * 92 * Also used to show what's going on for debugging purposes when the 93 * flag field is exported via the traceport interface 94 */ 95 96 /* prefer goal again. length */ 97 #define EXT4_MB_HINT_MERGE 0x0001 98 /* blocks already reserved */ 99 #define EXT4_MB_HINT_RESERVED 0x0002 100 /* metadata is being allocated */ 101 #define EXT4_MB_HINT_METADATA 0x0004 102 /* first blocks in the file */ 103 #define EXT4_MB_HINT_FIRST 0x0008 104 /* search for the best chunk */ 105 #define EXT4_MB_HINT_BEST 0x0010 106 /* data is being allocated */ 107 #define EXT4_MB_HINT_DATA 0x0020 108 /* don't preallocate (for tails) */ 109 #define EXT4_MB_HINT_NOPREALLOC 0x0040 110 /* allocate for locality group */ 111 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 112 /* allocate goal blocks or none */ 113 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 114 /* goal is meaningful */ 115 #define EXT4_MB_HINT_TRY_GOAL 0x0200 116 /* blocks already pre-reserved by delayed allocation */ 117 #define EXT4_MB_DELALLOC_RESERVED 0x0400 118 /* We are doing stream allocation */ 119 #define EXT4_MB_STREAM_ALLOC 0x0800 120 /* Use reserved root blocks if needed */ 121 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 122 /* Use blocks from reserved pool */ 123 #define EXT4_MB_USE_RESERVED 0x2000 124 125 struct ext4_allocation_request { 126 /* target inode for block we're allocating */ 127 struct inode *inode; 128 /* how many blocks we want to allocate */ 129 unsigned int len; 130 /* logical block in target inode */ 131 ext4_lblk_t logical; 132 /* the closest logical allocated block to the left */ 133 ext4_lblk_t lleft; 134 /* the closest logical allocated block to the right */ 135 ext4_lblk_t lright; 136 /* phys. target (a hint) */ 137 ext4_fsblk_t goal; 138 /* phys. block for the closest logical allocated block to the left */ 139 ext4_fsblk_t pleft; 140 /* phys. block for the closest logical allocated block to the right */ 141 ext4_fsblk_t pright; 142 /* flags. see above EXT4_MB_HINT_* */ 143 unsigned int flags; 144 }; 145 146 /* 147 * Logical to physical block mapping, used by ext4_map_blocks() 148 * 149 * This structure is used to pass requests into ext4_map_blocks() as 150 * well as to store the information returned by ext4_map_blocks(). It 151 * takes less room on the stack than a struct buffer_head. 152 */ 153 #define EXT4_MAP_NEW (1 << BH_New) 154 #define EXT4_MAP_MAPPED (1 << BH_Mapped) 155 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 156 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 157 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 158 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 159 160 struct ext4_map_blocks { 161 ext4_fsblk_t m_pblk; 162 ext4_lblk_t m_lblk; 163 unsigned int m_len; 164 unsigned int m_flags; 165 }; 166 167 /* 168 * Flags for ext4_io_end->flags 169 */ 170 #define EXT4_IO_END_UNWRITTEN 0x0001 171 172 /* 173 * For converting unwritten extents on a work queue. 'handle' is used for 174 * buffered writeback. 175 */ 176 typedef struct ext4_io_end { 177 struct list_head list; /* per-file finished IO list */ 178 handle_t *handle; /* handle reserved for extent 179 * conversion */ 180 struct inode *inode; /* file being written to */ 181 struct bio *bio; /* Linked list of completed 182 * bios covering the extent */ 183 unsigned int flag; /* unwritten or not */ 184 loff_t offset; /* offset in the file */ 185 ssize_t size; /* size of the extent */ 186 atomic_t count; /* reference counter */ 187 } ext4_io_end_t; 188 189 struct ext4_io_submit { 190 struct writeback_control *io_wbc; 191 struct bio *io_bio; 192 ext4_io_end_t *io_end; 193 sector_t io_next_block; 194 }; 195 196 /* 197 * Special inodes numbers 198 */ 199 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 200 #define EXT4_ROOT_INO 2 /* Root inode */ 201 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 202 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 203 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 204 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 205 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 206 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 207 208 /* First non-reserved inode for old ext4 filesystems */ 209 #define EXT4_GOOD_OLD_FIRST_INO 11 210 211 /* 212 * Maximal count of links to a file 213 */ 214 #define EXT4_LINK_MAX 65000 215 216 /* 217 * Macro-instructions used to manage several block sizes 218 */ 219 #define EXT4_MIN_BLOCK_SIZE 1024 220 #define EXT4_MAX_BLOCK_SIZE 65536 221 #define EXT4_MIN_BLOCK_LOG_SIZE 10 222 #define EXT4_MAX_BLOCK_LOG_SIZE 16 223 #ifdef __KERNEL__ 224 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 225 #else 226 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 227 #endif 228 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 229 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 230 EXT4_SB(s)->s_cluster_bits) 231 #ifdef __KERNEL__ 232 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 233 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 234 #else 235 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 236 #endif 237 #ifdef __KERNEL__ 238 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 239 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 240 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 241 #else 242 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 243 EXT4_GOOD_OLD_INODE_SIZE : \ 244 (s)->s_inode_size) 245 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 246 EXT4_GOOD_OLD_FIRST_INO : \ 247 (s)->s_first_ino) 248 #endif 249 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 250 251 /* Translate a block number to a cluster number */ 252 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 253 /* Translate a cluster number to a block number */ 254 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 255 /* Translate # of blks to # of clusters */ 256 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 257 (sbi)->s_cluster_bits) 258 /* Mask out the low bits to get the starting block of the cluster */ 259 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 260 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 261 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 262 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 263 /* Get the cluster offset */ 264 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 265 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 266 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 267 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 268 269 /* 270 * Structure of a blocks group descriptor 271 */ 272 struct ext4_group_desc 273 { 274 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 275 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 276 __le32 bg_inode_table_lo; /* Inodes table block */ 277 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 278 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 279 __le16 bg_used_dirs_count_lo; /* Directories count */ 280 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 281 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 282 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 283 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 284 __le16 bg_itable_unused_lo; /* Unused inodes count */ 285 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 286 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 287 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 288 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 289 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 290 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 291 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 292 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 293 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 294 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 295 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 296 __u32 bg_reserved; 297 }; 298 299 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 300 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 301 sizeof(__le16)) 302 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 303 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 304 sizeof(__le16)) 305 306 /* 307 * Structure of a flex block group info 308 */ 309 310 struct flex_groups { 311 atomic64_t free_clusters; 312 atomic_t free_inodes; 313 atomic_t used_dirs; 314 }; 315 316 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 317 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 318 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 319 320 /* 321 * Macro-instructions used to manage group descriptors 322 */ 323 #define EXT4_MIN_DESC_SIZE 32 324 #define EXT4_MIN_DESC_SIZE_64BIT 64 325 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 326 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 327 #ifdef __KERNEL__ 328 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 329 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 330 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 331 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 332 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 333 #else 334 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 335 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 336 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 337 #endif 338 339 /* 340 * Constants relative to the data blocks 341 */ 342 #define EXT4_NDIR_BLOCKS 12 343 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 344 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 345 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 346 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 347 348 /* 349 * Inode flags 350 */ 351 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 352 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 353 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 354 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 355 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 356 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 357 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 358 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 359 /* Reserved for compression usage... */ 360 #define EXT4_DIRTY_FL 0x00000100 361 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 362 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 363 /* nb: was previously EXT2_ECOMPR_FL */ 364 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 365 /* End compression flags --- maybe not all used */ 366 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 367 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 368 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 369 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 370 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 371 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 372 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 373 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 374 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 375 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 376 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 377 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 378 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 379 380 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 381 #define EXT4_FL_USER_MODIFIABLE 0x004380FF /* User modifiable flags */ 382 383 /* Flags that should be inherited by new inodes from their parent. */ 384 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 385 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 386 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 387 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 388 389 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 390 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 391 392 /* Flags that are appropriate for non-directories/regular files. */ 393 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 394 395 /* Mask out flags that are inappropriate for the given type of inode. */ 396 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 397 { 398 if (S_ISDIR(mode)) 399 return flags; 400 else if (S_ISREG(mode)) 401 return flags & EXT4_REG_FLMASK; 402 else 403 return flags & EXT4_OTHER_FLMASK; 404 } 405 406 /* 407 * Inode flags used for atomic set/get 408 */ 409 enum { 410 EXT4_INODE_SECRM = 0, /* Secure deletion */ 411 EXT4_INODE_UNRM = 1, /* Undelete */ 412 EXT4_INODE_COMPR = 2, /* Compress file */ 413 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 414 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 415 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 416 EXT4_INODE_NODUMP = 6, /* do not dump file */ 417 EXT4_INODE_NOATIME = 7, /* do not update atime */ 418 /* Reserved for compression usage... */ 419 EXT4_INODE_DIRTY = 8, 420 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 421 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 422 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 423 /* End compression flags --- maybe not all used */ 424 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 425 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 426 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 427 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 428 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 429 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 430 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 431 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 432 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 433 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 434 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 435 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 436 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 437 }; 438 439 /* 440 * Since it's pretty easy to mix up bit numbers and hex values, we use a 441 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 442 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 443 * any extra space in the compiled kernel image, otherwise, the build will fail. 444 * It's important that these values are the same, since we are using 445 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 446 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 447 * values found in ext2, ext3 and ext4 filesystems, and of course the values 448 * defined in e2fsprogs. 449 * 450 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 451 */ 452 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 453 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 454 455 static inline void ext4_check_flag_values(void) 456 { 457 CHECK_FLAG_VALUE(SECRM); 458 CHECK_FLAG_VALUE(UNRM); 459 CHECK_FLAG_VALUE(COMPR); 460 CHECK_FLAG_VALUE(SYNC); 461 CHECK_FLAG_VALUE(IMMUTABLE); 462 CHECK_FLAG_VALUE(APPEND); 463 CHECK_FLAG_VALUE(NODUMP); 464 CHECK_FLAG_VALUE(NOATIME); 465 CHECK_FLAG_VALUE(DIRTY); 466 CHECK_FLAG_VALUE(COMPRBLK); 467 CHECK_FLAG_VALUE(NOCOMPR); 468 CHECK_FLAG_VALUE(ENCRYPT); 469 CHECK_FLAG_VALUE(INDEX); 470 CHECK_FLAG_VALUE(IMAGIC); 471 CHECK_FLAG_VALUE(JOURNAL_DATA); 472 CHECK_FLAG_VALUE(NOTAIL); 473 CHECK_FLAG_VALUE(DIRSYNC); 474 CHECK_FLAG_VALUE(TOPDIR); 475 CHECK_FLAG_VALUE(HUGE_FILE); 476 CHECK_FLAG_VALUE(EXTENTS); 477 CHECK_FLAG_VALUE(EA_INODE); 478 CHECK_FLAG_VALUE(EOFBLOCKS); 479 CHECK_FLAG_VALUE(INLINE_DATA); 480 CHECK_FLAG_VALUE(PROJINHERIT); 481 CHECK_FLAG_VALUE(RESERVED); 482 } 483 484 /* Used to pass group descriptor data when online resize is done */ 485 struct ext4_new_group_input { 486 __u32 group; /* Group number for this data */ 487 __u64 block_bitmap; /* Absolute block number of block bitmap */ 488 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 489 __u64 inode_table; /* Absolute block number of inode table start */ 490 __u32 blocks_count; /* Total number of blocks in this group */ 491 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 492 __u16 unused; 493 }; 494 495 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 496 struct compat_ext4_new_group_input { 497 u32 group; 498 compat_u64 block_bitmap; 499 compat_u64 inode_bitmap; 500 compat_u64 inode_table; 501 u32 blocks_count; 502 u16 reserved_blocks; 503 u16 unused; 504 }; 505 #endif 506 507 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 508 struct ext4_new_group_data { 509 __u32 group; 510 __u64 block_bitmap; 511 __u64 inode_bitmap; 512 __u64 inode_table; 513 __u32 blocks_count; 514 __u16 reserved_blocks; 515 __u16 unused; 516 __u32 free_blocks_count; 517 }; 518 519 /* Indexes used to index group tables in ext4_new_group_data */ 520 enum { 521 BLOCK_BITMAP = 0, /* block bitmap */ 522 INODE_BITMAP, /* inode bitmap */ 523 INODE_TABLE, /* inode tables */ 524 GROUP_TABLE_COUNT, 525 }; 526 527 /* 528 * Flags used by ext4_map_blocks() 529 */ 530 /* Allocate any needed blocks and/or convert an unwritten 531 extent to be an initialized ext4 */ 532 #define EXT4_GET_BLOCKS_CREATE 0x0001 533 /* Request the creation of an unwritten extent */ 534 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 535 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 536 EXT4_GET_BLOCKS_CREATE) 537 /* Caller is from the delayed allocation writeout path 538 * finally doing the actual allocation of delayed blocks */ 539 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 540 /* caller is from the direct IO path, request to creation of an 541 unwritten extents if not allocated, split the unwritten 542 extent if blocks has been preallocated already*/ 543 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 544 #define EXT4_GET_BLOCKS_CONVERT 0x0010 545 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 546 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 547 /* Convert extent to initialized after IO complete */ 548 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 549 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 550 /* Eventual metadata allocation (due to growing extent tree) 551 * should not fail, so try to use reserved blocks for that.*/ 552 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 553 /* Don't normalize allocation size (used for fallocate) */ 554 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 555 /* Request will not result in inode size update (user for fallocate) */ 556 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 557 /* Do not take i_data_sem locking in ext4_map_blocks */ 558 #define EXT4_GET_BLOCKS_NO_LOCK 0x0100 559 /* Convert written extents to unwritten */ 560 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0200 561 562 /* 563 * The bit position of these flags must not overlap with any of the 564 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 565 * read_extent_tree_block(), ext4_split_extent_at(), 566 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 567 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 568 * caching the extents when reading from the extent tree while a 569 * truncate or punch hole operation is in progress. 570 */ 571 #define EXT4_EX_NOCACHE 0x40000000 572 #define EXT4_EX_FORCE_CACHE 0x20000000 573 574 /* 575 * Flags used by ext4_free_blocks 576 */ 577 #define EXT4_FREE_BLOCKS_METADATA 0x0001 578 #define EXT4_FREE_BLOCKS_FORGET 0x0002 579 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 580 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 581 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 582 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 583 584 /* Encryption algorithms */ 585 #define EXT4_ENCRYPTION_MODE_INVALID 0 586 #define EXT4_ENCRYPTION_MODE_AES_256_XTS 1 587 #define EXT4_ENCRYPTION_MODE_AES_256_GCM 2 588 #define EXT4_ENCRYPTION_MODE_AES_256_CBC 3 589 #define EXT4_ENCRYPTION_MODE_AES_256_CTS 4 590 591 #include "ext4_crypto.h" 592 593 /* 594 * ioctl commands 595 */ 596 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 597 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 598 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 599 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 600 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 601 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 602 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 603 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 604 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 605 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 606 #define EXT4_IOC_MIGRATE _IO('f', 9) 607 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 608 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 609 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 610 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 611 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 612 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 613 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 614 #define EXT4_IOC_SET_ENCRYPTION_POLICY _IOR('f', 19, struct ext4_encryption_policy) 615 #define EXT4_IOC_GET_ENCRYPTION_PWSALT _IOW('f', 20, __u8[16]) 616 #define EXT4_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct ext4_encryption_policy) 617 618 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 619 /* 620 * ioctl commands in 32 bit emulation 621 */ 622 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 623 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 624 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 625 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 626 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 627 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 628 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 629 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 630 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 631 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 632 #endif 633 634 /* Max physical block we can address w/o extents */ 635 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 636 637 /* 638 * Structure of an inode on the disk 639 */ 640 struct ext4_inode { 641 __le16 i_mode; /* File mode */ 642 __le16 i_uid; /* Low 16 bits of Owner Uid */ 643 __le32 i_size_lo; /* Size in bytes */ 644 __le32 i_atime; /* Access time */ 645 __le32 i_ctime; /* Inode Change time */ 646 __le32 i_mtime; /* Modification time */ 647 __le32 i_dtime; /* Deletion Time */ 648 __le16 i_gid; /* Low 16 bits of Group Id */ 649 __le16 i_links_count; /* Links count */ 650 __le32 i_blocks_lo; /* Blocks count */ 651 __le32 i_flags; /* File flags */ 652 union { 653 struct { 654 __le32 l_i_version; 655 } linux1; 656 struct { 657 __u32 h_i_translator; 658 } hurd1; 659 struct { 660 __u32 m_i_reserved1; 661 } masix1; 662 } osd1; /* OS dependent 1 */ 663 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 664 __le32 i_generation; /* File version (for NFS) */ 665 __le32 i_file_acl_lo; /* File ACL */ 666 __le32 i_size_high; 667 __le32 i_obso_faddr; /* Obsoleted fragment address */ 668 union { 669 struct { 670 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 671 __le16 l_i_file_acl_high; 672 __le16 l_i_uid_high; /* these 2 fields */ 673 __le16 l_i_gid_high; /* were reserved2[0] */ 674 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 675 __le16 l_i_reserved; 676 } linux2; 677 struct { 678 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 679 __u16 h_i_mode_high; 680 __u16 h_i_uid_high; 681 __u16 h_i_gid_high; 682 __u32 h_i_author; 683 } hurd2; 684 struct { 685 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 686 __le16 m_i_file_acl_high; 687 __u32 m_i_reserved2[2]; 688 } masix2; 689 } osd2; /* OS dependent 2 */ 690 __le16 i_extra_isize; 691 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 692 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 693 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 694 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 695 __le32 i_crtime; /* File Creation time */ 696 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 697 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 698 __le32 i_projid; /* Project ID */ 699 }; 700 701 struct move_extent { 702 __u32 reserved; /* should be zero */ 703 __u32 donor_fd; /* donor file descriptor */ 704 __u64 orig_start; /* logical start offset in block for orig */ 705 __u64 donor_start; /* logical start offset in block for donor */ 706 __u64 len; /* block length to be moved */ 707 __u64 moved_len; /* moved block length */ 708 }; 709 710 #define EXT4_EPOCH_BITS 2 711 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 712 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 713 714 /* 715 * Extended fields will fit into an inode if the filesystem was formatted 716 * with large inodes (-I 256 or larger) and there are not currently any EAs 717 * consuming all of the available space. For new inodes we always reserve 718 * enough space for the kernel's known extended fields, but for inodes 719 * created with an old kernel this might not have been the case. None of 720 * the extended inode fields is critical for correct filesystem operation. 721 * This macro checks if a certain field fits in the inode. Note that 722 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 723 */ 724 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 725 ((offsetof(typeof(*ext4_inode), field) + \ 726 sizeof((ext4_inode)->field)) \ 727 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 728 (einode)->i_extra_isize)) \ 729 730 static inline __le32 ext4_encode_extra_time(struct timespec *time) 731 { 732 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 733 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | 734 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); 735 } 736 737 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 738 { 739 if (sizeof(time->tv_sec) > 4) 740 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 741 << 32; 742 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 743 } 744 745 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 746 do { \ 747 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 748 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 749 (raw_inode)->xtime ## _extra = \ 750 ext4_encode_extra_time(&(inode)->xtime); \ 751 } while (0) 752 753 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 754 do { \ 755 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 756 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 757 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 758 (raw_inode)->xtime ## _extra = \ 759 ext4_encode_extra_time(&(einode)->xtime); \ 760 } while (0) 761 762 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 763 do { \ 764 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 765 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 766 ext4_decode_extra_time(&(inode)->xtime, \ 767 raw_inode->xtime ## _extra); \ 768 else \ 769 (inode)->xtime.tv_nsec = 0; \ 770 } while (0) 771 772 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 773 do { \ 774 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 775 (einode)->xtime.tv_sec = \ 776 (signed)le32_to_cpu((raw_inode)->xtime); \ 777 else \ 778 (einode)->xtime.tv_sec = 0; \ 779 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 780 ext4_decode_extra_time(&(einode)->xtime, \ 781 raw_inode->xtime ## _extra); \ 782 else \ 783 (einode)->xtime.tv_nsec = 0; \ 784 } while (0) 785 786 #define i_disk_version osd1.linux1.l_i_version 787 788 #if defined(__KERNEL__) || defined(__linux__) 789 #define i_reserved1 osd1.linux1.l_i_reserved1 790 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 791 #define i_blocks_high osd2.linux2.l_i_blocks_high 792 #define i_uid_low i_uid 793 #define i_gid_low i_gid 794 #define i_uid_high osd2.linux2.l_i_uid_high 795 #define i_gid_high osd2.linux2.l_i_gid_high 796 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 797 798 #elif defined(__GNU__) 799 800 #define i_translator osd1.hurd1.h_i_translator 801 #define i_uid_high osd2.hurd2.h_i_uid_high 802 #define i_gid_high osd2.hurd2.h_i_gid_high 803 #define i_author osd2.hurd2.h_i_author 804 805 #elif defined(__masix__) 806 807 #define i_reserved1 osd1.masix1.m_i_reserved1 808 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 809 #define i_reserved2 osd2.masix2.m_i_reserved2 810 811 #endif /* defined(__KERNEL__) || defined(__linux__) */ 812 813 #include "extents_status.h" 814 815 /* 816 * fourth extended file system inode data in memory 817 */ 818 struct ext4_inode_info { 819 __le32 i_data[15]; /* unconverted */ 820 __u32 i_dtime; 821 ext4_fsblk_t i_file_acl; 822 823 /* 824 * i_block_group is the number of the block group which contains 825 * this file's inode. Constant across the lifetime of the inode, 826 * it is ued for making block allocation decisions - we try to 827 * place a file's data blocks near its inode block, and new inodes 828 * near to their parent directory's inode. 829 */ 830 ext4_group_t i_block_group; 831 ext4_lblk_t i_dir_start_lookup; 832 #if (BITS_PER_LONG < 64) 833 unsigned long i_state_flags; /* Dynamic state flags */ 834 #endif 835 unsigned long i_flags; 836 837 /* 838 * Extended attributes can be read independently of the main file 839 * data. Taking i_mutex even when reading would cause contention 840 * between readers of EAs and writers of regular file data, so 841 * instead we synchronize on xattr_sem when reading or changing 842 * EAs. 843 */ 844 struct rw_semaphore xattr_sem; 845 846 struct list_head i_orphan; /* unlinked but open inodes */ 847 848 /* 849 * i_disksize keeps track of what the inode size is ON DISK, not 850 * in memory. During truncate, i_size is set to the new size by 851 * the VFS prior to calling ext4_truncate(), but the filesystem won't 852 * set i_disksize to 0 until the truncate is actually under way. 853 * 854 * The intent is that i_disksize always represents the blocks which 855 * are used by this file. This allows recovery to restart truncate 856 * on orphans if we crash during truncate. We actually write i_disksize 857 * into the on-disk inode when writing inodes out, instead of i_size. 858 * 859 * The only time when i_disksize and i_size may be different is when 860 * a truncate is in progress. The only things which change i_disksize 861 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 862 */ 863 loff_t i_disksize; 864 865 /* 866 * i_data_sem is for serialising ext4_truncate() against 867 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 868 * data tree are chopped off during truncate. We can't do that in 869 * ext4 because whenever we perform intermediate commits during 870 * truncate, the inode and all the metadata blocks *must* be in a 871 * consistent state which allows truncation of the orphans to restart 872 * during recovery. Hence we must fix the get_block-vs-truncate race 873 * by other means, so we have i_data_sem. 874 */ 875 struct rw_semaphore i_data_sem; 876 struct inode vfs_inode; 877 struct jbd2_inode *jinode; 878 879 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 880 881 /* 882 * File creation time. Its function is same as that of 883 * struct timespec i_{a,c,m}time in the generic inode. 884 */ 885 struct timespec i_crtime; 886 887 /* mballoc */ 888 struct list_head i_prealloc_list; 889 spinlock_t i_prealloc_lock; 890 891 /* extents status tree */ 892 struct ext4_es_tree i_es_tree; 893 rwlock_t i_es_lock; 894 struct list_head i_es_list; 895 unsigned int i_es_all_nr; /* protected by i_es_lock */ 896 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 897 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 898 extents to shrink. Protected by 899 i_es_lock */ 900 901 /* ialloc */ 902 ext4_group_t i_last_alloc_group; 903 904 /* allocation reservation info for delalloc */ 905 /* In case of bigalloc, these refer to clusters rather than blocks */ 906 unsigned int i_reserved_data_blocks; 907 unsigned int i_reserved_meta_blocks; 908 unsigned int i_allocated_meta_blocks; 909 ext4_lblk_t i_da_metadata_calc_last_lblock; 910 int i_da_metadata_calc_len; 911 912 /* on-disk additional length */ 913 __u16 i_extra_isize; 914 915 /* Indicate the inline data space. */ 916 u16 i_inline_off; 917 u16 i_inline_size; 918 919 #ifdef CONFIG_QUOTA 920 /* quota space reservation, managed internally by quota code */ 921 qsize_t i_reserved_quota; 922 #endif 923 924 /* Lock protecting lists below */ 925 spinlock_t i_completed_io_lock; 926 /* 927 * Completed IOs that need unwritten extents handling and have 928 * transaction reserved 929 */ 930 struct list_head i_rsv_conversion_list; 931 /* 932 * Completed IOs that need unwritten extents handling and don't have 933 * transaction reserved 934 */ 935 atomic_t i_ioend_count; /* Number of outstanding io_end structs */ 936 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 937 struct work_struct i_rsv_conversion_work; 938 939 spinlock_t i_block_reservation_lock; 940 941 /* 942 * Transactions that contain inode's metadata needed to complete 943 * fsync and fdatasync, respectively. 944 */ 945 tid_t i_sync_tid; 946 tid_t i_datasync_tid; 947 948 #ifdef CONFIG_QUOTA 949 struct dquot *i_dquot[MAXQUOTAS]; 950 #endif 951 952 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 953 __u32 i_csum_seed; 954 955 #ifdef CONFIG_EXT4_FS_ENCRYPTION 956 /* Encryption params */ 957 struct ext4_crypt_info *i_crypt_info; 958 #endif 959 }; 960 961 /* 962 * File system states 963 */ 964 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 965 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 966 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 967 968 /* 969 * Misc. filesystem flags 970 */ 971 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 972 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 973 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 974 975 /* 976 * Mount flags set via mount options or defaults 977 */ 978 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 979 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 980 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 981 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 982 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 983 #define EXT4_MOUNT_ERRORS_MASK 0x00070 984 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 985 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 986 #ifdef CONFIG_FS_DAX 987 #define EXT4_MOUNT_DAX 0x00200 /* Direct Access */ 988 #else 989 #define EXT4_MOUNT_DAX 0 990 #endif 991 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 992 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 993 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 994 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 995 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 996 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 997 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 998 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 999 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1000 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1001 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 1002 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 1003 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 1004 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1005 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1006 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1007 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1008 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1009 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1010 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1011 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1012 1013 /* 1014 * Mount flags set either automatically (could not be set by mount option) 1015 * based on per file system feature or property or in special cases such as 1016 * distinguishing between explicit mount option definition and default. 1017 */ 1018 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1019 specified delalloc */ 1020 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1021 size of blocksize * 8 1022 blocks */ 1023 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1024 file systems */ 1025 1026 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1027 ~EXT4_MOUNT_##opt 1028 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1029 EXT4_MOUNT_##opt 1030 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1031 EXT4_MOUNT_##opt) 1032 1033 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1034 ~EXT4_MOUNT2_##opt 1035 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1036 EXT4_MOUNT2_##opt 1037 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1038 EXT4_MOUNT2_##opt) 1039 1040 #define ext4_test_and_set_bit __test_and_set_bit_le 1041 #define ext4_set_bit __set_bit_le 1042 #define ext4_set_bit_atomic ext2_set_bit_atomic 1043 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1044 #define ext4_clear_bit __clear_bit_le 1045 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1046 #define ext4_test_bit test_bit_le 1047 #define ext4_find_next_zero_bit find_next_zero_bit_le 1048 #define ext4_find_next_bit find_next_bit_le 1049 1050 extern void ext4_set_bits(void *bm, int cur, int len); 1051 1052 /* 1053 * Maximal mount counts between two filesystem checks 1054 */ 1055 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1056 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1057 1058 /* 1059 * Behaviour when detecting errors 1060 */ 1061 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1062 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1063 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1064 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1065 1066 /* Metadata checksum algorithm codes */ 1067 #define EXT4_CRC32C_CHKSUM 1 1068 1069 /* 1070 * Structure of the super block 1071 */ 1072 struct ext4_super_block { 1073 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1074 __le32 s_blocks_count_lo; /* Blocks count */ 1075 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1076 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1077 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1078 __le32 s_first_data_block; /* First Data Block */ 1079 __le32 s_log_block_size; /* Block size */ 1080 __le32 s_log_cluster_size; /* Allocation cluster size */ 1081 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1082 __le32 s_clusters_per_group; /* # Clusters per group */ 1083 __le32 s_inodes_per_group; /* # Inodes per group */ 1084 __le32 s_mtime; /* Mount time */ 1085 /*30*/ __le32 s_wtime; /* Write time */ 1086 __le16 s_mnt_count; /* Mount count */ 1087 __le16 s_max_mnt_count; /* Maximal mount count */ 1088 __le16 s_magic; /* Magic signature */ 1089 __le16 s_state; /* File system state */ 1090 __le16 s_errors; /* Behaviour when detecting errors */ 1091 __le16 s_minor_rev_level; /* minor revision level */ 1092 /*40*/ __le32 s_lastcheck; /* time of last check */ 1093 __le32 s_checkinterval; /* max. time between checks */ 1094 __le32 s_creator_os; /* OS */ 1095 __le32 s_rev_level; /* Revision level */ 1096 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1097 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1098 /* 1099 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1100 * 1101 * Note: the difference between the compatible feature set and 1102 * the incompatible feature set is that if there is a bit set 1103 * in the incompatible feature set that the kernel doesn't 1104 * know about, it should refuse to mount the filesystem. 1105 * 1106 * e2fsck's requirements are more strict; if it doesn't know 1107 * about a feature in either the compatible or incompatible 1108 * feature set, it must abort and not try to meddle with 1109 * things it doesn't understand... 1110 */ 1111 __le32 s_first_ino; /* First non-reserved inode */ 1112 __le16 s_inode_size; /* size of inode structure */ 1113 __le16 s_block_group_nr; /* block group # of this superblock */ 1114 __le32 s_feature_compat; /* compatible feature set */ 1115 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1116 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1117 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1118 /*78*/ char s_volume_name[16]; /* volume name */ 1119 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 1120 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1121 /* 1122 * Performance hints. Directory preallocation should only 1123 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1124 */ 1125 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1126 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1127 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1128 /* 1129 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1130 */ 1131 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1132 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1133 __le32 s_journal_dev; /* device number of journal file */ 1134 __le32 s_last_orphan; /* start of list of inodes to delete */ 1135 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1136 __u8 s_def_hash_version; /* Default hash version to use */ 1137 __u8 s_jnl_backup_type; 1138 __le16 s_desc_size; /* size of group descriptor */ 1139 /*100*/ __le32 s_default_mount_opts; 1140 __le32 s_first_meta_bg; /* First metablock block group */ 1141 __le32 s_mkfs_time; /* When the filesystem was created */ 1142 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1143 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1144 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1145 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1146 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1147 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1148 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1149 __le32 s_flags; /* Miscellaneous flags */ 1150 __le16 s_raid_stride; /* RAID stride */ 1151 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1152 __le64 s_mmp_block; /* Block for multi-mount protection */ 1153 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1154 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1155 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1156 __u8 s_encryption_level; /* versioning level for encryption */ 1157 __u8 s_reserved_pad; /* Padding to next 32bits */ 1158 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1159 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1160 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1161 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1162 snapshot's future use */ 1163 __le32 s_snapshot_list; /* inode number of the head of the 1164 on-disk snapshot list */ 1165 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1166 __le32 s_error_count; /* number of fs errors */ 1167 __le32 s_first_error_time; /* first time an error happened */ 1168 __le32 s_first_error_ino; /* inode involved in first error */ 1169 __le64 s_first_error_block; /* block involved of first error */ 1170 __u8 s_first_error_func[32]; /* function where the error happened */ 1171 __le32 s_first_error_line; /* line number where error happened */ 1172 __le32 s_last_error_time; /* most recent time of an error */ 1173 __le32 s_last_error_ino; /* inode involved in last error */ 1174 __le32 s_last_error_line; /* line number where error happened */ 1175 __le64 s_last_error_block; /* block involved of last error */ 1176 __u8 s_last_error_func[32]; /* function where the error happened */ 1177 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1178 __u8 s_mount_opts[64]; 1179 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1180 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1181 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1182 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1183 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1184 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1185 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1186 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1187 __le32 s_reserved[99]; /* 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 1379 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1380 { 1381 return sb->s_fs_info; 1382 } 1383 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1384 { 1385 return container_of(inode, struct ext4_inode_info, vfs_inode); 1386 } 1387 1388 static inline struct timespec ext4_current_time(struct inode *inode) 1389 { 1390 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1391 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1392 } 1393 1394 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1395 { 1396 return ino == EXT4_ROOT_INO || 1397 ino == EXT4_USR_QUOTA_INO || 1398 ino == EXT4_GRP_QUOTA_INO || 1399 ino == EXT4_BOOT_LOADER_INO || 1400 ino == EXT4_JOURNAL_INO || 1401 ino == EXT4_RESIZE_INO || 1402 (ino >= EXT4_FIRST_INO(sb) && 1403 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1404 } 1405 1406 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 1407 struct ext4_io_end *io_end) 1408 { 1409 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 1410 io_end->flag |= EXT4_IO_END_UNWRITTEN; 1411 atomic_inc(&EXT4_I(inode)->i_unwritten); 1412 } 1413 } 1414 1415 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode) 1416 { 1417 return inode->i_private; 1418 } 1419 1420 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io) 1421 { 1422 inode->i_private = io; 1423 } 1424 1425 /* 1426 * Inode dynamic state flags 1427 */ 1428 enum { 1429 EXT4_STATE_JDATA, /* journaled data exists */ 1430 EXT4_STATE_NEW, /* inode is newly created */ 1431 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1432 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1433 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1434 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1435 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1436 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1437 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read 1438 nolocking */ 1439 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1440 EXT4_STATE_ORDERED_MODE, /* data=ordered mode */ 1441 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1442 }; 1443 1444 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1445 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1446 { \ 1447 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1448 } \ 1449 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1450 { \ 1451 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1452 } \ 1453 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1454 { \ 1455 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1456 } 1457 1458 /* Add these declarations here only so that these functions can be 1459 * found by name. Otherwise, they are very hard to locate. */ 1460 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1461 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1462 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1463 EXT4_INODE_BIT_FNS(flag, flags, 0) 1464 1465 /* Add these declarations here only so that these functions can be 1466 * found by name. Otherwise, they are very hard to locate. */ 1467 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1468 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1469 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1470 #if (BITS_PER_LONG < 64) 1471 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1472 1473 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1474 { 1475 (ei)->i_state_flags = 0; 1476 } 1477 #else 1478 EXT4_INODE_BIT_FNS(state, flags, 32) 1479 1480 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1481 { 1482 /* We depend on the fact that callers will set i_flags */ 1483 } 1484 #endif 1485 #else 1486 /* Assume that user mode programs are passing in an ext4fs superblock, not 1487 * a kernel struct super_block. This will allow us to call the feature-test 1488 * macros from user land. */ 1489 #define EXT4_SB(sb) (sb) 1490 #endif 1491 1492 /* 1493 * Returns true if the inode is inode is encrypted 1494 */ 1495 static inline int ext4_encrypted_inode(struct inode *inode) 1496 { 1497 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1498 return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT); 1499 #else 1500 return 0; 1501 #endif 1502 } 1503 1504 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1505 1506 /* 1507 * Codes for operating systems 1508 */ 1509 #define EXT4_OS_LINUX 0 1510 #define EXT4_OS_HURD 1 1511 #define EXT4_OS_MASIX 2 1512 #define EXT4_OS_FREEBSD 3 1513 #define EXT4_OS_LITES 4 1514 1515 /* 1516 * Revision levels 1517 */ 1518 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1519 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1520 1521 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1522 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1523 1524 #define EXT4_GOOD_OLD_INODE_SIZE 128 1525 1526 /* 1527 * Feature set definitions 1528 */ 1529 1530 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1531 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1532 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1533 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1534 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1535 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1536 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1537 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1538 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1539 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1540 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1541 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1542 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1543 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1544 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1545 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1546 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1547 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1548 1549 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1550 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1551 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1552 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1553 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1554 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1555 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1556 1557 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1558 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1559 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1560 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1561 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1562 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1563 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1564 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1565 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1566 /* 1567 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1568 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1569 * all other data structures' checksums. However, the METADATA_CSUM and 1570 * GDT_CSUM bits are mutually exclusive. 1571 */ 1572 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1573 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1574 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 1575 1576 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1577 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1578 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1579 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1580 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1581 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1582 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1583 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1584 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1585 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1586 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1587 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */ 1588 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1589 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1590 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1591 1592 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1593 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1594 EXT4_FEATURE_INCOMPAT_META_BG) 1595 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1596 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1597 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1598 1599 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1600 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1601 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1602 EXT4_FEATURE_INCOMPAT_META_BG) 1603 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1604 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1605 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1606 1607 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 1608 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1609 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1610 EXT4_FEATURE_INCOMPAT_META_BG| \ 1611 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1612 EXT4_FEATURE_INCOMPAT_64BIT| \ 1613 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1614 EXT4_FEATURE_INCOMPAT_MMP | \ 1615 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 1616 EXT4_FEATURE_INCOMPAT_ENCRYPT) 1617 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1618 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1619 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1620 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1621 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1622 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1623 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1624 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1625 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1626 EXT4_FEATURE_RO_COMPAT_QUOTA) 1627 1628 /* 1629 * Default values for user and/or group using reserved blocks 1630 */ 1631 #define EXT4_DEF_RESUID 0 1632 #define EXT4_DEF_RESGID 0 1633 1634 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1635 1636 /* 1637 * Default mount options 1638 */ 1639 #define EXT4_DEFM_DEBUG 0x0001 1640 #define EXT4_DEFM_BSDGROUPS 0x0002 1641 #define EXT4_DEFM_XATTR_USER 0x0004 1642 #define EXT4_DEFM_ACL 0x0008 1643 #define EXT4_DEFM_UID16 0x0010 1644 #define EXT4_DEFM_JMODE 0x0060 1645 #define EXT4_DEFM_JMODE_DATA 0x0020 1646 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1647 #define EXT4_DEFM_JMODE_WBACK 0x0060 1648 #define EXT4_DEFM_NOBARRIER 0x0100 1649 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1650 #define EXT4_DEFM_DISCARD 0x0400 1651 #define EXT4_DEFM_NODELALLOC 0x0800 1652 1653 /* 1654 * Default journal batch times 1655 */ 1656 #define EXT4_DEF_MIN_BATCH_TIME 0 1657 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1658 1659 /* 1660 * Minimum number of groups in a flexgroup before we separate out 1661 * directories into the first block group of a flexgroup 1662 */ 1663 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1664 1665 /* 1666 * Structure of a directory entry 1667 */ 1668 #define EXT4_NAME_LEN 255 1669 1670 struct ext4_dir_entry { 1671 __le32 inode; /* Inode number */ 1672 __le16 rec_len; /* Directory entry length */ 1673 __le16 name_len; /* Name length */ 1674 char name[EXT4_NAME_LEN]; /* File name */ 1675 }; 1676 1677 /* 1678 * The new version of the directory entry. Since EXT4 structures are 1679 * stored in intel byte order, and the name_len field could never be 1680 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1681 * file_type field. 1682 */ 1683 struct ext4_dir_entry_2 { 1684 __le32 inode; /* Inode number */ 1685 __le16 rec_len; /* Directory entry length */ 1686 __u8 name_len; /* Name length */ 1687 __u8 file_type; 1688 char name[EXT4_NAME_LEN]; /* File name */ 1689 }; 1690 1691 /* 1692 * This is a bogus directory entry at the end of each leaf block that 1693 * records checksums. 1694 */ 1695 struct ext4_dir_entry_tail { 1696 __le32 det_reserved_zero1; /* Pretend to be unused */ 1697 __le16 det_rec_len; /* 12 */ 1698 __u8 det_reserved_zero2; /* Zero name length */ 1699 __u8 det_reserved_ft; /* 0xDE, fake file type */ 1700 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1701 }; 1702 1703 #define EXT4_DIRENT_TAIL(block, blocksize) \ 1704 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 1705 ((blocksize) - \ 1706 sizeof(struct ext4_dir_entry_tail)))) 1707 1708 /* 1709 * Ext4 directory file types. Only the low 3 bits are used. The 1710 * other bits are reserved for now. 1711 */ 1712 #define EXT4_FT_UNKNOWN 0 1713 #define EXT4_FT_REG_FILE 1 1714 #define EXT4_FT_DIR 2 1715 #define EXT4_FT_CHRDEV 3 1716 #define EXT4_FT_BLKDEV 4 1717 #define EXT4_FT_FIFO 5 1718 #define EXT4_FT_SOCK 6 1719 #define EXT4_FT_SYMLINK 7 1720 1721 #define EXT4_FT_MAX 8 1722 1723 #define EXT4_FT_DIR_CSUM 0xDE 1724 1725 /* 1726 * EXT4_DIR_PAD defines the directory entries boundaries 1727 * 1728 * NOTE: It must be a multiple of 4 1729 */ 1730 #define EXT4_DIR_PAD 4 1731 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1732 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1733 ~EXT4_DIR_ROUND) 1734 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1735 1736 /* 1737 * If we ever get support for fs block sizes > page_size, we'll need 1738 * to remove the #if statements in the next two functions... 1739 */ 1740 static inline unsigned int 1741 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1742 { 1743 unsigned len = le16_to_cpu(dlen); 1744 1745 #if (PAGE_CACHE_SIZE >= 65536) 1746 if (len == EXT4_MAX_REC_LEN || len == 0) 1747 return blocksize; 1748 return (len & 65532) | ((len & 3) << 16); 1749 #else 1750 return len; 1751 #endif 1752 } 1753 1754 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1755 { 1756 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1757 BUG(); 1758 #if (PAGE_CACHE_SIZE >= 65536) 1759 if (len < 65536) 1760 return cpu_to_le16(len); 1761 if (len == blocksize) { 1762 if (blocksize == 65536) 1763 return cpu_to_le16(EXT4_MAX_REC_LEN); 1764 else 1765 return cpu_to_le16(0); 1766 } 1767 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 1768 #else 1769 return cpu_to_le16(len); 1770 #endif 1771 } 1772 1773 /* 1774 * Hash Tree Directory indexing 1775 * (c) Daniel Phillips, 2001 1776 */ 1777 1778 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 1779 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 1780 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 1781 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 1782 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 1783 1784 /* Legal values for the dx_root hash_version field: */ 1785 1786 #define DX_HASH_LEGACY 0 1787 #define DX_HASH_HALF_MD4 1 1788 #define DX_HASH_TEA 2 1789 #define DX_HASH_LEGACY_UNSIGNED 3 1790 #define DX_HASH_HALF_MD4_UNSIGNED 4 1791 #define DX_HASH_TEA_UNSIGNED 5 1792 1793 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 1794 const void *address, unsigned int length) 1795 { 1796 struct { 1797 struct shash_desc shash; 1798 char ctx[4]; 1799 } desc; 1800 int err; 1801 1802 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 1803 1804 desc.shash.tfm = sbi->s_chksum_driver; 1805 desc.shash.flags = 0; 1806 *(u32 *)desc.ctx = crc; 1807 1808 err = crypto_shash_update(&desc.shash, address, length); 1809 BUG_ON(err); 1810 1811 return *(u32 *)desc.ctx; 1812 } 1813 1814 #ifdef __KERNEL__ 1815 1816 /* hash info structure used by the directory hash */ 1817 struct dx_hash_info 1818 { 1819 u32 hash; 1820 u32 minor_hash; 1821 int hash_version; 1822 u32 *seed; 1823 }; 1824 1825 1826 /* 32 and 64 bit signed EOF for dx directories */ 1827 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 1828 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 1829 1830 1831 /* 1832 * Control parameters used by ext4_htree_next_block 1833 */ 1834 #define HASH_NB_ALWAYS 1 1835 1836 struct ext4_filename { 1837 const struct qstr *usr_fname; 1838 struct ext4_str disk_name; 1839 struct dx_hash_info hinfo; 1840 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1841 struct ext4_str crypto_buf; 1842 #endif 1843 }; 1844 1845 #define fname_name(p) ((p)->disk_name.name) 1846 #define fname_len(p) ((p)->disk_name.len) 1847 1848 /* 1849 * Describe an inode's exact location on disk and in memory 1850 */ 1851 struct ext4_iloc 1852 { 1853 struct buffer_head *bh; 1854 unsigned long offset; 1855 ext4_group_t block_group; 1856 }; 1857 1858 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 1859 { 1860 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 1861 } 1862 1863 /* 1864 * This structure is stuffed into the struct file's private_data field 1865 * for directories. It is where we put information so that we can do 1866 * readdir operations in hash tree order. 1867 */ 1868 struct dir_private_info { 1869 struct rb_root root; 1870 struct rb_node *curr_node; 1871 struct fname *extra_fname; 1872 loff_t last_pos; 1873 __u32 curr_hash; 1874 __u32 curr_minor_hash; 1875 __u32 next_hash; 1876 }; 1877 1878 /* calculate the first block number of the group */ 1879 static inline ext4_fsblk_t 1880 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 1881 { 1882 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 1883 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 1884 } 1885 1886 /* 1887 * Special error return code only used by dx_probe() and its callers. 1888 */ 1889 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 1890 1891 /* 1892 * Timeout and state flag for lazy initialization inode thread. 1893 */ 1894 #define EXT4_DEF_LI_WAIT_MULT 10 1895 #define EXT4_DEF_LI_MAX_START_DELAY 5 1896 #define EXT4_LAZYINIT_QUIT 0x0001 1897 #define EXT4_LAZYINIT_RUNNING 0x0002 1898 1899 /* 1900 * Lazy inode table initialization info 1901 */ 1902 struct ext4_lazy_init { 1903 unsigned long li_state; 1904 struct list_head li_request_list; 1905 struct mutex li_list_mtx; 1906 }; 1907 1908 struct ext4_li_request { 1909 struct super_block *lr_super; 1910 struct ext4_sb_info *lr_sbi; 1911 ext4_group_t lr_next_group; 1912 struct list_head lr_request; 1913 unsigned long lr_next_sched; 1914 unsigned long lr_timeout; 1915 }; 1916 1917 struct ext4_features { 1918 struct kobject f_kobj; 1919 struct completion f_kobj_unregister; 1920 }; 1921 1922 /* 1923 * This structure will be used for multiple mount protection. It will be 1924 * written into the block number saved in the s_mmp_block field in the 1925 * superblock. Programs that check MMP should assume that if 1926 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 1927 * to use the filesystem, regardless of how old the timestamp is. 1928 */ 1929 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 1930 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 1931 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 1932 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 1933 1934 struct mmp_struct { 1935 __le32 mmp_magic; /* Magic number for MMP */ 1936 __le32 mmp_seq; /* Sequence no. updated periodically */ 1937 1938 /* 1939 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 1940 * purposes and do not affect the correctness of the algorithm 1941 */ 1942 __le64 mmp_time; /* Time last updated */ 1943 char mmp_nodename[64]; /* Node which last updated MMP block */ 1944 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 1945 1946 /* 1947 * mmp_check_interval is used to verify if the MMP block has been 1948 * updated on the block device. The value is updated based on the 1949 * maximum time to write the MMP block during an update cycle. 1950 */ 1951 __le16 mmp_check_interval; 1952 1953 __le16 mmp_pad1; 1954 __le32 mmp_pad2[226]; 1955 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 1956 }; 1957 1958 /* arguments passed to the mmp thread */ 1959 struct mmpd_data { 1960 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 1961 struct super_block *sb; /* super block of the fs */ 1962 }; 1963 1964 /* 1965 * Check interval multiplier 1966 * The MMP block is written every update interval and initially checked every 1967 * update interval x the multiplier (the value is then adapted based on the 1968 * write latency). The reason is that writes can be delayed under load and we 1969 * don't want readers to incorrectly assume that the filesystem is no longer 1970 * in use. 1971 */ 1972 #define EXT4_MMP_CHECK_MULT 2UL 1973 1974 /* 1975 * Minimum interval for MMP checking in seconds. 1976 */ 1977 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 1978 1979 /* 1980 * Maximum interval for MMP checking in seconds. 1981 */ 1982 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 1983 1984 /* 1985 * Function prototypes 1986 */ 1987 1988 /* 1989 * Ok, these declarations are also in <linux/kernel.h> but none of the 1990 * ext4 source programs needs to include it so they are duplicated here. 1991 */ 1992 # define NORET_TYPE /**/ 1993 # define ATTRIB_NORET __attribute__((noreturn)) 1994 # define NORET_AND noreturn, 1995 1996 /* bitmap.c */ 1997 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 1998 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 1999 struct ext4_group_desc *gdp, 2000 struct buffer_head *bh, int sz); 2001 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2002 struct ext4_group_desc *gdp, 2003 struct buffer_head *bh, int sz); 2004 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2005 struct ext4_group_desc *gdp, 2006 struct buffer_head *bh); 2007 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2008 struct ext4_group_desc *gdp, 2009 struct buffer_head *bh); 2010 2011 /* balloc.c */ 2012 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2013 ext4_fsblk_t blocknr, 2014 ext4_group_t *blockgrpp, 2015 ext4_grpblk_t *offsetp); 2016 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2017 ext4_fsblk_t block); 2018 2019 extern unsigned int ext4_block_group(struct super_block *sb, 2020 ext4_fsblk_t blocknr); 2021 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2022 ext4_fsblk_t blocknr); 2023 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2024 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2025 ext4_group_t group); 2026 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2027 ext4_fsblk_t goal, 2028 unsigned int flags, 2029 unsigned long *count, 2030 int *errp); 2031 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2032 s64 nclusters, unsigned int flags); 2033 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2034 extern void ext4_check_blocks_bitmap(struct super_block *); 2035 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2036 ext4_group_t block_group, 2037 struct buffer_head ** bh); 2038 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2039 2040 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2041 ext4_group_t block_group); 2042 extern int ext4_wait_block_bitmap(struct super_block *sb, 2043 ext4_group_t block_group, 2044 struct buffer_head *bh); 2045 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2046 ext4_group_t block_group); 2047 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2048 ext4_group_t block_group, 2049 struct ext4_group_desc *gdp); 2050 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2051 2052 /* crypto_policy.c */ 2053 int ext4_is_child_context_consistent_with_parent(struct inode *parent, 2054 struct inode *child); 2055 int ext4_inherit_context(struct inode *parent, struct inode *child); 2056 void ext4_to_hex(char *dst, char *src, size_t src_size); 2057 int ext4_process_policy(const struct ext4_encryption_policy *policy, 2058 struct inode *inode); 2059 int ext4_get_policy(struct inode *inode, 2060 struct ext4_encryption_policy *policy); 2061 2062 /* crypto.c */ 2063 extern struct kmem_cache *ext4_crypt_info_cachep; 2064 bool ext4_valid_contents_enc_mode(uint32_t mode); 2065 uint32_t ext4_validate_encryption_key_size(uint32_t mode, uint32_t size); 2066 extern struct workqueue_struct *ext4_read_workqueue; 2067 struct ext4_crypto_ctx *ext4_get_crypto_ctx(struct inode *inode); 2068 void ext4_release_crypto_ctx(struct ext4_crypto_ctx *ctx); 2069 void ext4_restore_control_page(struct page *data_page); 2070 struct page *ext4_encrypt(struct inode *inode, 2071 struct page *plaintext_page); 2072 int ext4_decrypt(struct page *page); 2073 int ext4_encrypted_zeroout(struct inode *inode, struct ext4_extent *ex); 2074 2075 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2076 int ext4_init_crypto(void); 2077 void ext4_exit_crypto(void); 2078 static inline int ext4_sb_has_crypto(struct super_block *sb) 2079 { 2080 return EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT); 2081 } 2082 #else 2083 static inline int ext4_init_crypto(void) { return 0; } 2084 static inline void ext4_exit_crypto(void) { } 2085 static inline int ext4_sb_has_crypto(struct super_block *sb) 2086 { 2087 return 0; 2088 } 2089 #endif 2090 2091 /* crypto_fname.c */ 2092 bool ext4_valid_filenames_enc_mode(uint32_t mode); 2093 u32 ext4_fname_crypto_round_up(u32 size, u32 blksize); 2094 unsigned ext4_fname_encrypted_size(struct inode *inode, u32 ilen); 2095 int ext4_fname_crypto_alloc_buffer(struct inode *inode, 2096 u32 ilen, struct ext4_str *crypto_str); 2097 int _ext4_fname_disk_to_usr(struct inode *inode, 2098 struct dx_hash_info *hinfo, 2099 const struct ext4_str *iname, 2100 struct ext4_str *oname); 2101 int ext4_fname_disk_to_usr(struct inode *inode, 2102 struct dx_hash_info *hinfo, 2103 const struct ext4_dir_entry_2 *de, 2104 struct ext4_str *oname); 2105 int ext4_fname_usr_to_disk(struct inode *inode, 2106 const struct qstr *iname, 2107 struct ext4_str *oname); 2108 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2109 void ext4_fname_crypto_free_buffer(struct ext4_str *crypto_str); 2110 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname, 2111 int lookup, struct ext4_filename *fname); 2112 void ext4_fname_free_filename(struct ext4_filename *fname); 2113 #else 2114 static inline 2115 int ext4_setup_fname_crypto(struct inode *inode) 2116 { 2117 return 0; 2118 } 2119 static inline void ext4_fname_crypto_free_buffer(struct ext4_str *p) { } 2120 static inline int ext4_fname_setup_filename(struct inode *dir, 2121 const struct qstr *iname, 2122 int lookup, struct ext4_filename *fname) 2123 { 2124 fname->usr_fname = iname; 2125 fname->disk_name.name = (unsigned char *) iname->name; 2126 fname->disk_name.len = iname->len; 2127 return 0; 2128 } 2129 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { } 2130 #endif 2131 2132 2133 /* crypto_key.c */ 2134 void ext4_free_crypt_info(struct ext4_crypt_info *ci); 2135 void ext4_free_encryption_info(struct inode *inode, struct ext4_crypt_info *ci); 2136 int _ext4_get_encryption_info(struct inode *inode); 2137 2138 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2139 int ext4_has_encryption_key(struct inode *inode); 2140 2141 static inline int ext4_get_encryption_info(struct inode *inode) 2142 { 2143 struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info; 2144 2145 if (!ci || 2146 (ci->ci_keyring_key && 2147 (ci->ci_keyring_key->flags & ((1 << KEY_FLAG_INVALIDATED) | 2148 (1 << KEY_FLAG_REVOKED) | 2149 (1 << KEY_FLAG_DEAD))))) 2150 return _ext4_get_encryption_info(inode); 2151 return 0; 2152 } 2153 2154 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode) 2155 { 2156 return EXT4_I(inode)->i_crypt_info; 2157 } 2158 2159 #else 2160 static inline int ext4_has_encryption_key(struct inode *inode) 2161 { 2162 return 0; 2163 } 2164 static inline int ext4_get_encryption_info(struct inode *inode) 2165 { 2166 return 0; 2167 } 2168 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode) 2169 { 2170 return NULL; 2171 } 2172 #endif 2173 2174 2175 /* dir.c */ 2176 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2177 struct file *, 2178 struct ext4_dir_entry_2 *, 2179 struct buffer_head *, char *, int, 2180 unsigned int); 2181 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2182 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2183 (de), (bh), (buf), (size), (offset))) 2184 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2185 __u32 minor_hash, 2186 struct ext4_dir_entry_2 *dirent, 2187 struct ext4_str *ent_name); 2188 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2189 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2190 struct buffer_head *bh, 2191 void *buf, int buf_size, 2192 struct ext4_filename *fname, 2193 struct ext4_dir_entry_2 **dest_de); 2194 int ext4_insert_dentry(struct inode *dir, 2195 struct inode *inode, 2196 struct ext4_dir_entry_2 *de, 2197 int buf_size, 2198 struct ext4_filename *fname); 2199 static inline void ext4_update_dx_flag(struct inode *inode) 2200 { 2201 if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb, 2202 EXT4_FEATURE_COMPAT_DIR_INDEX)) 2203 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2204 } 2205 static unsigned char ext4_filetype_table[] = { 2206 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2207 }; 2208 2209 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2210 { 2211 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE) || 2212 (filetype >= EXT4_FT_MAX)) 2213 return DT_UNKNOWN; 2214 2215 return ext4_filetype_table[filetype]; 2216 } 2217 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2218 void *buf, int buf_size); 2219 2220 /* fsync.c */ 2221 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2222 2223 /* hash.c */ 2224 extern int ext4fs_dirhash(const char *name, int len, struct 2225 dx_hash_info *hinfo); 2226 2227 /* ialloc.c */ 2228 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2229 const struct qstr *qstr, __u32 goal, 2230 uid_t *owner, int handle_type, 2231 unsigned int line_no, int nblocks); 2232 2233 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \ 2234 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2235 0, 0, 0) 2236 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2237 type, nblocks) \ 2238 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2239 (type), __LINE__, (nblocks)) 2240 2241 2242 extern void ext4_free_inode(handle_t *, struct inode *); 2243 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2244 extern unsigned long ext4_count_free_inodes(struct super_block *); 2245 extern unsigned long ext4_count_dirs(struct super_block *); 2246 extern void ext4_check_inodes_bitmap(struct super_block *); 2247 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2248 extern int ext4_init_inode_table(struct super_block *sb, 2249 ext4_group_t group, int barrier); 2250 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2251 2252 /* mballoc.c */ 2253 extern const struct file_operations ext4_seq_mb_groups_fops; 2254 extern long ext4_mb_stats; 2255 extern long ext4_mb_max_to_scan; 2256 extern int ext4_mb_init(struct super_block *); 2257 extern int ext4_mb_release(struct super_block *); 2258 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2259 struct ext4_allocation_request *, int *); 2260 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2261 extern void ext4_discard_preallocations(struct inode *); 2262 extern int __init ext4_init_mballoc(void); 2263 extern void ext4_exit_mballoc(void); 2264 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2265 struct buffer_head *bh, ext4_fsblk_t block, 2266 unsigned long count, int flags); 2267 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2268 ext4_group_t ngroups); 2269 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2270 ext4_group_t i, struct ext4_group_desc *desc); 2271 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2272 ext4_fsblk_t block, unsigned long count); 2273 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2274 2275 /* inode.c */ 2276 int ext4_inode_is_fast_symlink(struct inode *inode); 2277 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2278 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2279 int ext4_get_block_write(struct inode *inode, sector_t iblock, 2280 struct buffer_head *bh_result, int create); 2281 int ext4_get_block_dax(struct inode *inode, sector_t iblock, 2282 struct buffer_head *bh_result, int create); 2283 int ext4_get_block(struct inode *inode, sector_t iblock, 2284 struct buffer_head *bh_result, int create); 2285 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2286 struct buffer_head *bh, int create); 2287 int ext4_walk_page_buffers(handle_t *handle, 2288 struct buffer_head *head, 2289 unsigned from, 2290 unsigned to, 2291 int *partial, 2292 int (*fn)(handle_t *handle, 2293 struct buffer_head *bh)); 2294 int do_journal_get_write_access(handle_t *handle, 2295 struct buffer_head *bh); 2296 #define FALL_BACK_TO_NONDELALLOC 1 2297 #define CONVERT_INLINE_DATA 2 2298 2299 extern struct inode *ext4_iget(struct super_block *, unsigned long); 2300 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long); 2301 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2302 extern int ext4_setattr(struct dentry *, struct iattr *); 2303 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 2304 struct kstat *stat); 2305 extern void ext4_evict_inode(struct inode *); 2306 extern void ext4_clear_inode(struct inode *); 2307 extern int ext4_sync_inode(handle_t *, struct inode *); 2308 extern void ext4_dirty_inode(struct inode *, int); 2309 extern int ext4_change_inode_journal_flag(struct inode *, int); 2310 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2311 extern int ext4_inode_attach_jinode(struct inode *inode); 2312 extern int ext4_can_truncate(struct inode *inode); 2313 extern void ext4_truncate(struct inode *); 2314 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2315 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 2316 extern void ext4_set_inode_flags(struct inode *); 2317 extern void ext4_get_inode_flags(struct ext4_inode_info *); 2318 extern int ext4_alloc_da_blocks(struct inode *inode); 2319 extern void ext4_set_aops(struct inode *inode); 2320 extern int ext4_writepage_trans_blocks(struct inode *); 2321 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2322 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2323 loff_t lstart, loff_t lend); 2324 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 2325 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2326 extern void ext4_da_update_reserve_space(struct inode *inode, 2327 int used, int quota_claim); 2328 2329 /* indirect.c */ 2330 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2331 struct ext4_map_blocks *map, int flags); 2332 extern ssize_t ext4_ind_direct_IO(struct kiocb *iocb, struct iov_iter *iter, 2333 loff_t offset); 2334 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2335 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2336 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2337 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2338 ext4_lblk_t start, ext4_lblk_t end); 2339 2340 /* ioctl.c */ 2341 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2342 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2343 2344 /* migrate.c */ 2345 extern int ext4_ext_migrate(struct inode *); 2346 extern int ext4_ind_migrate(struct inode *inode); 2347 2348 /* namei.c */ 2349 extern int ext4_dirent_csum_verify(struct inode *inode, 2350 struct ext4_dir_entry *dirent); 2351 extern int ext4_orphan_add(handle_t *, struct inode *); 2352 extern int ext4_orphan_del(handle_t *, struct inode *); 2353 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2354 __u32 start_minor_hash, __u32 *next_hash); 2355 extern int ext4_search_dir(struct buffer_head *bh, 2356 char *search_buf, 2357 int buf_size, 2358 struct inode *dir, 2359 struct ext4_filename *fname, 2360 const struct qstr *d_name, 2361 unsigned int offset, 2362 struct ext4_dir_entry_2 **res_dir); 2363 extern int ext4_generic_delete_entry(handle_t *handle, 2364 struct inode *dir, 2365 struct ext4_dir_entry_2 *de_del, 2366 struct buffer_head *bh, 2367 void *entry_buf, 2368 int buf_size, 2369 int csum_size); 2370 extern int ext4_empty_dir(struct inode *inode); 2371 2372 /* resize.c */ 2373 extern int ext4_group_add(struct super_block *sb, 2374 struct ext4_new_group_data *input); 2375 extern int ext4_group_extend(struct super_block *sb, 2376 struct ext4_super_block *es, 2377 ext4_fsblk_t n_blocks_count); 2378 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2379 2380 /* super.c */ 2381 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 2382 extern int ext4_calculate_overhead(struct super_block *sb); 2383 extern void ext4_superblock_csum_set(struct super_block *sb); 2384 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 2385 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 2386 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2387 ext4_group_t ngroup); 2388 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2389 char nbuf[16]); 2390 2391 extern __printf(4, 5) 2392 void __ext4_error(struct super_block *, const char *, unsigned int, 2393 const char *, ...); 2394 extern __printf(5, 6) 2395 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2396 const char *, ...); 2397 extern __printf(5, 6) 2398 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2399 const char *, ...); 2400 extern void __ext4_std_error(struct super_block *, const char *, 2401 unsigned int, int); 2402 extern __printf(4, 5) 2403 void __ext4_abort(struct super_block *, const char *, unsigned int, 2404 const char *, ...); 2405 extern __printf(4, 5) 2406 void __ext4_warning(struct super_block *, const char *, unsigned int, 2407 const char *, ...); 2408 extern __printf(4, 5) 2409 void __ext4_warning_inode(const struct inode *inode, const char *function, 2410 unsigned int line, const char *fmt, ...); 2411 extern __printf(3, 4) 2412 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2413 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2414 const char *, unsigned int, const char *); 2415 extern __printf(7, 8) 2416 void __ext4_grp_locked_error(const char *, unsigned int, 2417 struct super_block *, ext4_group_t, 2418 unsigned long, ext4_fsblk_t, 2419 const char *, ...); 2420 2421 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 2422 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 2423 2424 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 2425 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 2426 2427 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 2428 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 2429 2430 #ifdef CONFIG_PRINTK 2431 2432 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2433 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__) 2434 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2435 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2436 #define ext4_error(sb, fmt, ...) \ 2437 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2438 #define ext4_abort(sb, fmt, ...) \ 2439 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2440 #define ext4_warning(sb, fmt, ...) \ 2441 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2442 #define ext4_warning_inode(inode, fmt, ...) \ 2443 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 2444 #define ext4_msg(sb, level, fmt, ...) \ 2445 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 2446 #define dump_mmp_msg(sb, mmp, msg) \ 2447 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 2448 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2449 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 2450 fmt, ##__VA_ARGS__) 2451 2452 #else 2453 2454 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2455 do { \ 2456 no_printk(fmt, ##__VA_ARGS__); \ 2457 __ext4_error_inode(inode, "", 0, block, " "); \ 2458 } while (0) 2459 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2460 do { \ 2461 no_printk(fmt, ##__VA_ARGS__); \ 2462 __ext4_error_file(file, "", 0, block, " "); \ 2463 } while (0) 2464 #define ext4_error(sb, fmt, ...) \ 2465 do { \ 2466 no_printk(fmt, ##__VA_ARGS__); \ 2467 __ext4_error(sb, "", 0, " "); \ 2468 } while (0) 2469 #define ext4_abort(sb, fmt, ...) \ 2470 do { \ 2471 no_printk(fmt, ##__VA_ARGS__); \ 2472 __ext4_abort(sb, "", 0, " "); \ 2473 } while (0) 2474 #define ext4_warning(sb, fmt, ...) \ 2475 do { \ 2476 no_printk(fmt, ##__VA_ARGS__); \ 2477 __ext4_warning(sb, "", 0, " "); \ 2478 } while (0) 2479 #define ext4_warning_inode(inode, fmt, ...) \ 2480 do { \ 2481 no_printk(fmt, ##__VA_ARGS__); \ 2482 __ext4_warning_inode(inode, "", 0, " "); \ 2483 } while (0) 2484 #define ext4_msg(sb, level, fmt, ...) \ 2485 do { \ 2486 no_printk(fmt, ##__VA_ARGS__); \ 2487 __ext4_msg(sb, "", " "); \ 2488 } while (0) 2489 #define dump_mmp_msg(sb, mmp, msg) \ 2490 __dump_mmp_msg(sb, mmp, "", 0, "") 2491 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2492 do { \ 2493 no_printk(fmt, ##__VA_ARGS__); \ 2494 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 2495 } while (0) 2496 2497 #endif 2498 2499 extern void ext4_update_dynamic_rev(struct super_block *sb); 2500 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2501 __u32 compat); 2502 extern int ext4_update_rocompat_feature(handle_t *handle, 2503 struct super_block *sb, __u32 rocompat); 2504 extern int ext4_update_incompat_feature(handle_t *handle, 2505 struct super_block *sb, __u32 incompat); 2506 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2507 struct ext4_group_desc *bg); 2508 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2509 struct ext4_group_desc *bg); 2510 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2511 struct ext4_group_desc *bg); 2512 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2513 struct ext4_group_desc *bg); 2514 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2515 struct ext4_group_desc *bg); 2516 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2517 struct ext4_group_desc *bg); 2518 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2519 struct ext4_group_desc *bg); 2520 extern void ext4_block_bitmap_set(struct super_block *sb, 2521 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2522 extern void ext4_inode_bitmap_set(struct super_block *sb, 2523 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2524 extern void ext4_inode_table_set(struct super_block *sb, 2525 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2526 extern void ext4_free_group_clusters_set(struct super_block *sb, 2527 struct ext4_group_desc *bg, 2528 __u32 count); 2529 extern void ext4_free_inodes_set(struct super_block *sb, 2530 struct ext4_group_desc *bg, __u32 count); 2531 extern void ext4_used_dirs_set(struct super_block *sb, 2532 struct ext4_group_desc *bg, __u32 count); 2533 extern void ext4_itable_unused_set(struct super_block *sb, 2534 struct ext4_group_desc *bg, __u32 count); 2535 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2536 struct ext4_group_desc *gdp); 2537 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2538 struct ext4_group_desc *gdp); 2539 extern int ext4_register_li_request(struct super_block *sb, 2540 ext4_group_t first_not_zeroed); 2541 2542 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2543 { 2544 return EXT4_HAS_RO_COMPAT_FEATURE(sb, 2545 EXT4_FEATURE_RO_COMPAT_GDT_CSUM) || 2546 (EXT4_SB(sb)->s_chksum_driver != NULL); 2547 } 2548 2549 static inline int ext4_has_metadata_csum(struct super_block *sb) 2550 { 2551 WARN_ON_ONCE(EXT4_HAS_RO_COMPAT_FEATURE(sb, 2552 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) && 2553 !EXT4_SB(sb)->s_chksum_driver); 2554 2555 return (EXT4_SB(sb)->s_chksum_driver != NULL); 2556 } 2557 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2558 { 2559 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2560 le32_to_cpu(es->s_blocks_count_lo); 2561 } 2562 2563 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2564 { 2565 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2566 le32_to_cpu(es->s_r_blocks_count_lo); 2567 } 2568 2569 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2570 { 2571 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2572 le32_to_cpu(es->s_free_blocks_count_lo); 2573 } 2574 2575 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2576 ext4_fsblk_t blk) 2577 { 2578 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2579 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2580 } 2581 2582 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2583 ext4_fsblk_t blk) 2584 { 2585 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2586 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2587 } 2588 2589 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2590 ext4_fsblk_t blk) 2591 { 2592 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2593 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2594 } 2595 2596 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 2597 { 2598 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2599 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2600 le32_to_cpu(raw_inode->i_size_lo); 2601 else 2602 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2603 } 2604 2605 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2606 { 2607 raw_inode->i_size_lo = cpu_to_le32(i_size); 2608 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2609 } 2610 2611 static inline 2612 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2613 ext4_group_t group) 2614 { 2615 struct ext4_group_info ***grp_info; 2616 long indexv, indexh; 2617 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 2618 grp_info = EXT4_SB(sb)->s_group_info; 2619 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2620 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2621 return grp_info[indexv][indexh]; 2622 } 2623 2624 /* 2625 * Reading s_groups_count requires using smp_rmb() afterwards. See 2626 * the locking protocol documented in the comments of ext4_group_add() 2627 * in resize.c 2628 */ 2629 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2630 { 2631 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2632 2633 smp_rmb(); 2634 return ngroups; 2635 } 2636 2637 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2638 ext4_group_t block_group) 2639 { 2640 return block_group >> sbi->s_log_groups_per_flex; 2641 } 2642 2643 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2644 { 2645 return 1 << sbi->s_log_groups_per_flex; 2646 } 2647 2648 #define ext4_std_error(sb, errno) \ 2649 do { \ 2650 if ((errno)) \ 2651 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2652 } while (0) 2653 2654 #ifdef CONFIG_SMP 2655 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2656 * counters. So we need to make sure we have free clusters more 2657 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2658 */ 2659 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2660 #else 2661 #define EXT4_FREECLUSTERS_WATERMARK 0 2662 #endif 2663 2664 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 2665 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2666 { 2667 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 2668 !mutex_is_locked(&inode->i_mutex)); 2669 down_write(&EXT4_I(inode)->i_data_sem); 2670 if (newsize > EXT4_I(inode)->i_disksize) 2671 EXT4_I(inode)->i_disksize = newsize; 2672 up_write(&EXT4_I(inode)->i_data_sem); 2673 } 2674 2675 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 2676 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 2677 { 2678 int changed = 0; 2679 2680 if (newsize > inode->i_size) { 2681 i_size_write(inode, newsize); 2682 changed = 1; 2683 } 2684 if (newsize > EXT4_I(inode)->i_disksize) { 2685 ext4_update_i_disksize(inode, newsize); 2686 changed |= 2; 2687 } 2688 return changed; 2689 } 2690 2691 struct ext4_group_info { 2692 unsigned long bb_state; 2693 struct rb_root bb_free_root; 2694 ext4_grpblk_t bb_first_free; /* first free block */ 2695 ext4_grpblk_t bb_free; /* total free blocks */ 2696 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 2697 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 2698 struct list_head bb_prealloc_list; 2699 #ifdef DOUBLE_CHECK 2700 void *bb_bitmap; 2701 #endif 2702 struct rw_semaphore alloc_sem; 2703 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2704 * regions, index is order. 2705 * bb_counters[3] = 5 means 2706 * 5 free 8-block regions. */ 2707 }; 2708 2709 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 2710 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 2711 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 2712 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 2713 2714 #define EXT4_MB_GRP_NEED_INIT(grp) \ 2715 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 2716 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 2717 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2718 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 2719 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2720 2721 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 2722 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2723 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 2724 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2725 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 2726 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2727 2728 #define EXT4_MAX_CONTENTION 8 2729 #define EXT4_CONTENTION_THRESHOLD 2 2730 2731 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2732 ext4_group_t group) 2733 { 2734 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2735 } 2736 2737 /* 2738 * Returns true if the filesystem is busy enough that attempts to 2739 * access the block group locks has run into contention. 2740 */ 2741 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 2742 { 2743 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 2744 } 2745 2746 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 2747 { 2748 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 2749 if (spin_trylock(lock)) 2750 /* 2751 * We're able to grab the lock right away, so drop the 2752 * lock contention counter. 2753 */ 2754 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 2755 else { 2756 /* 2757 * The lock is busy, so bump the contention counter, 2758 * and then wait on the spin lock. 2759 */ 2760 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 2761 EXT4_MAX_CONTENTION); 2762 spin_lock(lock); 2763 } 2764 } 2765 2766 static inline void ext4_unlock_group(struct super_block *sb, 2767 ext4_group_t group) 2768 { 2769 spin_unlock(ext4_group_lock_ptr(sb, group)); 2770 } 2771 2772 /* 2773 * Block validity checking 2774 */ 2775 #define ext4_check_indirect_blockref(inode, bh) \ 2776 ext4_check_blockref(__func__, __LINE__, inode, \ 2777 (__le32 *)(bh)->b_data, \ 2778 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 2779 2780 #define ext4_ind_check_inode(inode) \ 2781 ext4_check_blockref(__func__, __LINE__, inode, \ 2782 EXT4_I(inode)->i_data, \ 2783 EXT4_NDIR_BLOCKS) 2784 2785 /* 2786 * Inodes and files operations 2787 */ 2788 2789 /* dir.c */ 2790 extern const struct file_operations ext4_dir_operations; 2791 2792 /* file.c */ 2793 extern const struct inode_operations ext4_file_inode_operations; 2794 extern const struct file_operations ext4_file_operations; 2795 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 2796 2797 /* inline.c */ 2798 extern int ext4_get_max_inline_size(struct inode *inode); 2799 extern int ext4_find_inline_data_nolock(struct inode *inode); 2800 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 2801 unsigned int len); 2802 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 2803 2804 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 2805 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 2806 struct inode *inode, 2807 loff_t pos, unsigned len, 2808 unsigned flags, 2809 struct page **pagep); 2810 extern int ext4_write_inline_data_end(struct inode *inode, 2811 loff_t pos, unsigned len, 2812 unsigned copied, 2813 struct page *page); 2814 extern struct buffer_head * 2815 ext4_journalled_write_inline_data(struct inode *inode, 2816 unsigned len, 2817 struct page *page); 2818 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 2819 struct inode *inode, 2820 loff_t pos, unsigned len, 2821 unsigned flags, 2822 struct page **pagep, 2823 void **fsdata); 2824 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 2825 unsigned len, unsigned copied, 2826 struct page *page); 2827 extern int ext4_try_add_inline_entry(handle_t *handle, 2828 struct ext4_filename *fname, 2829 struct dentry *dentry, 2830 struct inode *inode); 2831 extern int ext4_try_create_inline_dir(handle_t *handle, 2832 struct inode *parent, 2833 struct inode *inode); 2834 extern int ext4_read_inline_dir(struct file *filp, 2835 struct dir_context *ctx, 2836 int *has_inline_data); 2837 extern int htree_inlinedir_to_tree(struct file *dir_file, 2838 struct inode *dir, ext4_lblk_t block, 2839 struct dx_hash_info *hinfo, 2840 __u32 start_hash, __u32 start_minor_hash, 2841 int *has_inline_data); 2842 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 2843 struct ext4_filename *fname, 2844 const struct qstr *d_name, 2845 struct ext4_dir_entry_2 **res_dir, 2846 int *has_inline_data); 2847 extern int ext4_delete_inline_entry(handle_t *handle, 2848 struct inode *dir, 2849 struct ext4_dir_entry_2 *de_del, 2850 struct buffer_head *bh, 2851 int *has_inline_data); 2852 extern int empty_inline_dir(struct inode *dir, int *has_inline_data); 2853 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 2854 struct ext4_dir_entry_2 **parent_de, 2855 int *retval); 2856 extern int ext4_inline_data_fiemap(struct inode *inode, 2857 struct fiemap_extent_info *fieinfo, 2858 int *has_inline, __u64 start, __u64 len); 2859 extern int ext4_try_to_evict_inline_data(handle_t *handle, 2860 struct inode *inode, 2861 int needed); 2862 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline); 2863 2864 extern int ext4_convert_inline_data(struct inode *inode); 2865 2866 static inline int ext4_has_inline_data(struct inode *inode) 2867 { 2868 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 2869 EXT4_I(inode)->i_inline_off; 2870 } 2871 2872 /* namei.c */ 2873 extern const struct inode_operations ext4_dir_inode_operations; 2874 extern const struct inode_operations ext4_special_inode_operations; 2875 extern struct dentry *ext4_get_parent(struct dentry *child); 2876 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 2877 struct ext4_dir_entry_2 *de, 2878 int blocksize, int csum_size, 2879 unsigned int parent_ino, int dotdot_real_len); 2880 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t, 2881 unsigned int blocksize); 2882 extern int ext4_handle_dirty_dirent_node(handle_t *handle, 2883 struct inode *inode, 2884 struct buffer_head *bh); 2885 #define S_SHIFT 12 2886 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = { 2887 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 2888 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 2889 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 2890 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 2891 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 2892 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 2893 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 2894 }; 2895 2896 static inline void ext4_set_de_type(struct super_block *sb, 2897 struct ext4_dir_entry_2 *de, 2898 umode_t mode) { 2899 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE)) 2900 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 2901 } 2902 2903 /* readpages.c */ 2904 extern int ext4_mpage_readpages(struct address_space *mapping, 2905 struct list_head *pages, struct page *page, 2906 unsigned nr_pages); 2907 2908 /* symlink.c */ 2909 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 2910 extern const struct inode_operations ext4_symlink_inode_operations; 2911 extern const struct inode_operations ext4_fast_symlink_inode_operations; 2912 2913 /* sysfs.c */ 2914 extern int ext4_register_sysfs(struct super_block *sb); 2915 extern void ext4_unregister_sysfs(struct super_block *sb); 2916 extern int __init ext4_init_sysfs(void); 2917 extern void ext4_exit_sysfs(void); 2918 2919 /* block_validity */ 2920 extern void ext4_release_system_zone(struct super_block *sb); 2921 extern int ext4_setup_system_zone(struct super_block *sb); 2922 extern int __init ext4_init_system_zone(void); 2923 extern void ext4_exit_system_zone(void); 2924 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 2925 ext4_fsblk_t start_blk, 2926 unsigned int count); 2927 extern int ext4_check_blockref(const char *, unsigned int, 2928 struct inode *, __le32 *, unsigned int); 2929 2930 /* extents.c */ 2931 struct ext4_ext_path; 2932 struct ext4_extent; 2933 2934 /* 2935 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 2936 * __le32. 2937 */ 2938 #define EXT_MAX_BLOCKS 0xffffffff 2939 2940 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 2941 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 2942 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 2943 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 2944 struct ext4_map_blocks *map, int flags); 2945 extern void ext4_ext_truncate(handle_t *, struct inode *); 2946 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 2947 ext4_lblk_t end); 2948 extern void ext4_ext_init(struct super_block *); 2949 extern void ext4_ext_release(struct super_block *); 2950 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 2951 loff_t len); 2952 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 2953 loff_t offset, ssize_t len); 2954 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 2955 struct ext4_map_blocks *map, int flags); 2956 extern int ext4_ext_calc_metadata_amount(struct inode *inode, 2957 ext4_lblk_t lblocks); 2958 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 2959 int num, 2960 struct ext4_ext_path *path); 2961 extern int ext4_can_extents_be_merged(struct inode *inode, 2962 struct ext4_extent *ex1, 2963 struct ext4_extent *ex2); 2964 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 2965 struct ext4_ext_path **, 2966 struct ext4_extent *, int); 2967 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 2968 struct ext4_ext_path **, 2969 int flags); 2970 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 2971 extern int ext4_ext_check_inode(struct inode *inode); 2972 extern int ext4_find_delalloc_range(struct inode *inode, 2973 ext4_lblk_t lblk_start, 2974 ext4_lblk_t lblk_end); 2975 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk); 2976 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 2977 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2978 __u64 start, __u64 len); 2979 extern int ext4_ext_precache(struct inode *inode); 2980 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len); 2981 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len); 2982 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 2983 struct inode *inode2, ext4_lblk_t lblk1, 2984 ext4_lblk_t lblk2, ext4_lblk_t count, 2985 int mark_unwritten,int *err); 2986 2987 /* move_extent.c */ 2988 extern void ext4_double_down_write_data_sem(struct inode *first, 2989 struct inode *second); 2990 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 2991 struct inode *donor_inode); 2992 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 2993 __u64 start_orig, __u64 start_donor, 2994 __u64 len, __u64 *moved_len); 2995 2996 /* page-io.c */ 2997 extern int __init ext4_init_pageio(void); 2998 extern void ext4_exit_pageio(void); 2999 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3000 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3001 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3002 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3003 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3004 struct writeback_control *wbc); 3005 extern void ext4_end_io_rsv_work(struct work_struct *work); 3006 extern void ext4_io_submit(struct ext4_io_submit *io); 3007 extern int ext4_bio_write_page(struct ext4_io_submit *io, 3008 struct page *page, 3009 int len, 3010 struct writeback_control *wbc, 3011 bool keep_towrite); 3012 3013 /* mmp.c */ 3014 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3015 3016 /* 3017 * Add new method to test whether block and inode bitmaps are properly 3018 * initialized. With uninit_bg reading the block from disk is not enough 3019 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3020 */ 3021 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3022 3023 static inline int bitmap_uptodate(struct buffer_head *bh) 3024 { 3025 return (buffer_uptodate(bh) && 3026 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3027 } 3028 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3029 { 3030 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3031 } 3032 3033 /* 3034 * Disable DIO read nolock optimization, so new dioreaders will be forced 3035 * to grab i_mutex 3036 */ 3037 static inline void ext4_inode_block_unlocked_dio(struct inode *inode) 3038 { 3039 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 3040 smp_mb(); 3041 } 3042 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode) 3043 { 3044 smp_mb(); 3045 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 3046 } 3047 3048 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3049 3050 /* For ioend & aio unwritten conversion wait queues */ 3051 #define EXT4_WQ_HASH_SZ 37 3052 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3053 EXT4_WQ_HASH_SZ]) 3054 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\ 3055 EXT4_WQ_HASH_SZ]) 3056 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3057 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; 3058 3059 #define EXT4_RESIZING 0 3060 extern int ext4_resize_begin(struct super_block *sb); 3061 extern void ext4_resize_end(struct super_block *sb); 3062 3063 #endif /* __KERNEL__ */ 3064 3065 #endif /* _EXT4_H */ 3066