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/version.h> 30 #include <linux/wait.h> 31 #include <linux/blockgroup_lock.h> 32 #include <linux/percpu_counter.h> 33 #include <linux/ratelimit.h> 34 #include <crypto/hash.h> 35 #include <linux/fscrypto.h> 36 #include <linux/falloc.h> 37 #include <linux/percpu-rwsem.h> 38 #ifdef __KERNEL__ 39 #include <linux/compat.h> 40 #endif 41 42 /* 43 * The fourth extended filesystem constants/structures 44 */ 45 46 /* 47 * with AGGRESSIVE_CHECK allocator runs consistency checks over 48 * structures. these checks slow things down a lot 49 */ 50 #define AGGRESSIVE_CHECK__ 51 52 /* 53 * with DOUBLE_CHECK defined mballoc creates persistent in-core 54 * bitmaps, maintains and uses them to check for double allocations 55 */ 56 #define DOUBLE_CHECK__ 57 58 /* 59 * Define EXT4FS_DEBUG to produce debug messages 60 */ 61 #undef EXT4FS_DEBUG 62 63 /* 64 * Debug code 65 */ 66 #ifdef EXT4FS_DEBUG 67 #define ext4_debug(f, a...) \ 68 do { \ 69 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 70 __FILE__, __LINE__, __func__); \ 71 printk(KERN_DEBUG f, ## a); \ 72 } while (0) 73 #else 74 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 75 #endif 76 77 /* 78 * Turn on EXT_DEBUG to get lots of info about extents operations. 79 */ 80 #define EXT_DEBUG__ 81 #ifdef EXT_DEBUG 82 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__) 83 #else 84 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 85 #endif 86 87 /* data type for block offset of block group */ 88 typedef int ext4_grpblk_t; 89 90 /* data type for filesystem-wide blocks number */ 91 typedef unsigned long long ext4_fsblk_t; 92 93 /* data type for file logical block number */ 94 typedef __u32 ext4_lblk_t; 95 96 /* data type for block group number */ 97 typedef unsigned int ext4_group_t; 98 99 enum SHIFT_DIRECTION { 100 SHIFT_LEFT = 0, 101 SHIFT_RIGHT, 102 }; 103 104 /* 105 * Flags used in mballoc's allocation_context flags field. 106 * 107 * Also used to show what's going on for debugging purposes when the 108 * flag field is exported via the traceport interface 109 */ 110 111 /* prefer goal again. length */ 112 #define EXT4_MB_HINT_MERGE 0x0001 113 /* blocks already reserved */ 114 #define EXT4_MB_HINT_RESERVED 0x0002 115 /* metadata is being allocated */ 116 #define EXT4_MB_HINT_METADATA 0x0004 117 /* first blocks in the file */ 118 #define EXT4_MB_HINT_FIRST 0x0008 119 /* search for the best chunk */ 120 #define EXT4_MB_HINT_BEST 0x0010 121 /* data is being allocated */ 122 #define EXT4_MB_HINT_DATA 0x0020 123 /* don't preallocate (for tails) */ 124 #define EXT4_MB_HINT_NOPREALLOC 0x0040 125 /* allocate for locality group */ 126 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 127 /* allocate goal blocks or none */ 128 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 129 /* goal is meaningful */ 130 #define EXT4_MB_HINT_TRY_GOAL 0x0200 131 /* blocks already pre-reserved by delayed allocation */ 132 #define EXT4_MB_DELALLOC_RESERVED 0x0400 133 /* We are doing stream allocation */ 134 #define EXT4_MB_STREAM_ALLOC 0x0800 135 /* Use reserved root blocks if needed */ 136 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 137 /* Use blocks from reserved pool */ 138 #define EXT4_MB_USE_RESERVED 0x2000 139 140 struct ext4_allocation_request { 141 /* target inode for block we're allocating */ 142 struct inode *inode; 143 /* how many blocks we want to allocate */ 144 unsigned int len; 145 /* logical block in target inode */ 146 ext4_lblk_t logical; 147 /* the closest logical allocated block to the left */ 148 ext4_lblk_t lleft; 149 /* the closest logical allocated block to the right */ 150 ext4_lblk_t lright; 151 /* phys. target (a hint) */ 152 ext4_fsblk_t goal; 153 /* phys. block for the closest logical allocated block to the left */ 154 ext4_fsblk_t pleft; 155 /* phys. block for the closest logical allocated block to the right */ 156 ext4_fsblk_t pright; 157 /* flags. see above EXT4_MB_HINT_* */ 158 unsigned int flags; 159 }; 160 161 /* 162 * Logical to physical block mapping, used by ext4_map_blocks() 163 * 164 * This structure is used to pass requests into ext4_map_blocks() as 165 * well as to store the information returned by ext4_map_blocks(). It 166 * takes less room on the stack than a struct buffer_head. 167 */ 168 #define EXT4_MAP_NEW (1 << BH_New) 169 #define EXT4_MAP_MAPPED (1 << BH_Mapped) 170 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 171 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 172 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 173 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 174 175 struct ext4_map_blocks { 176 ext4_fsblk_t m_pblk; 177 ext4_lblk_t m_lblk; 178 unsigned int m_len; 179 unsigned int m_flags; 180 }; 181 182 /* 183 * Flags for ext4_io_end->flags 184 */ 185 #define EXT4_IO_END_UNWRITTEN 0x0001 186 187 /* 188 * For converting unwritten extents on a work queue. 'handle' is used for 189 * buffered writeback. 190 */ 191 typedef struct ext4_io_end { 192 struct list_head list; /* per-file finished IO list */ 193 handle_t *handle; /* handle reserved for extent 194 * conversion */ 195 struct inode *inode; /* file being written to */ 196 struct bio *bio; /* Linked list of completed 197 * bios covering the extent */ 198 unsigned int flag; /* unwritten or not */ 199 atomic_t count; /* reference counter */ 200 loff_t offset; /* offset in the file */ 201 ssize_t size; /* size of the extent */ 202 } ext4_io_end_t; 203 204 struct ext4_io_submit { 205 struct writeback_control *io_wbc; 206 struct bio *io_bio; 207 ext4_io_end_t *io_end; 208 sector_t io_next_block; 209 }; 210 211 /* 212 * Special inodes numbers 213 */ 214 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 215 #define EXT4_ROOT_INO 2 /* Root inode */ 216 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 217 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 218 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 219 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 220 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 221 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 222 223 /* First non-reserved inode for old ext4 filesystems */ 224 #define EXT4_GOOD_OLD_FIRST_INO 11 225 226 /* 227 * Maximal count of links to a file 228 */ 229 #define EXT4_LINK_MAX 65000 230 231 /* 232 * Macro-instructions used to manage several block sizes 233 */ 234 #define EXT4_MIN_BLOCK_SIZE 1024 235 #define EXT4_MAX_BLOCK_SIZE 65536 236 #define EXT4_MIN_BLOCK_LOG_SIZE 10 237 #define EXT4_MAX_BLOCK_LOG_SIZE 16 238 #ifdef __KERNEL__ 239 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 240 #else 241 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 242 #endif 243 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 244 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 245 EXT4_SB(s)->s_cluster_bits) 246 #ifdef __KERNEL__ 247 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 248 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 249 #else 250 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 251 #endif 252 #ifdef __KERNEL__ 253 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 254 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 255 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 256 #else 257 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 258 EXT4_GOOD_OLD_INODE_SIZE : \ 259 (s)->s_inode_size) 260 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 261 EXT4_GOOD_OLD_FIRST_INO : \ 262 (s)->s_first_ino) 263 #endif 264 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 265 266 /* Translate a block number to a cluster number */ 267 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 268 /* Translate a cluster number to a block number */ 269 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 270 /* Translate # of blks to # of clusters */ 271 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 272 (sbi)->s_cluster_bits) 273 /* Mask out the low bits to get the starting block of the cluster */ 274 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 275 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 276 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 277 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 278 /* Get the cluster offset */ 279 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 280 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 281 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 282 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 283 284 /* 285 * Structure of a blocks group descriptor 286 */ 287 struct ext4_group_desc 288 { 289 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 290 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 291 __le32 bg_inode_table_lo; /* Inodes table block */ 292 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 293 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 294 __le16 bg_used_dirs_count_lo; /* Directories count */ 295 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 296 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 297 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 298 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 299 __le16 bg_itable_unused_lo; /* Unused inodes count */ 300 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 301 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 302 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 303 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 304 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 305 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 306 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 307 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 308 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 309 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 310 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 311 __u32 bg_reserved; 312 }; 313 314 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 315 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 316 sizeof(__le16)) 317 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 318 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 319 sizeof(__le16)) 320 321 /* 322 * Structure of a flex block group info 323 */ 324 325 struct flex_groups { 326 atomic64_t free_clusters; 327 atomic_t free_inodes; 328 atomic_t used_dirs; 329 }; 330 331 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 332 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 333 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 334 335 /* 336 * Macro-instructions used to manage group descriptors 337 */ 338 #define EXT4_MIN_DESC_SIZE 32 339 #define EXT4_MIN_DESC_SIZE_64BIT 64 340 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 341 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 342 #ifdef __KERNEL__ 343 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 344 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 345 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 346 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 347 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 348 #else 349 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 350 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 351 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 352 #endif 353 354 /* 355 * Constants relative to the data blocks 356 */ 357 #define EXT4_NDIR_BLOCKS 12 358 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 359 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 360 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 361 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 362 363 /* 364 * Inode flags 365 */ 366 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 367 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 368 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 369 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 370 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 371 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 372 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 373 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 374 /* Reserved for compression usage... */ 375 #define EXT4_DIRTY_FL 0x00000100 376 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 377 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 378 /* nb: was previously EXT2_ECOMPR_FL */ 379 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 380 /* End compression flags --- maybe not all used */ 381 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 382 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 383 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 384 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 385 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 386 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 387 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 388 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 389 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 390 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 391 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 392 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 393 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 394 395 #define EXT4_FL_USER_VISIBLE 0x304BDFFF /* User visible flags */ 396 #define EXT4_FL_USER_MODIFIABLE 0x204380FF /* User modifiable flags */ 397 398 #define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \ 399 EXT4_IMMUTABLE_FL | \ 400 EXT4_APPEND_FL | \ 401 EXT4_NODUMP_FL | \ 402 EXT4_NOATIME_FL | \ 403 EXT4_PROJINHERIT_FL) 404 405 /* Flags that should be inherited by new inodes from their parent. */ 406 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 407 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 408 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 409 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 410 EXT4_PROJINHERIT_FL) 411 412 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 413 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 414 415 /* Flags that are appropriate for non-directories/regular files. */ 416 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 417 418 /* Mask out flags that are inappropriate for the given type of inode. */ 419 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 420 { 421 if (S_ISDIR(mode)) 422 return flags; 423 else if (S_ISREG(mode)) 424 return flags & EXT4_REG_FLMASK; 425 else 426 return flags & EXT4_OTHER_FLMASK; 427 } 428 429 /* 430 * Inode flags used for atomic set/get 431 */ 432 enum { 433 EXT4_INODE_SECRM = 0, /* Secure deletion */ 434 EXT4_INODE_UNRM = 1, /* Undelete */ 435 EXT4_INODE_COMPR = 2, /* Compress file */ 436 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 437 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 438 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 439 EXT4_INODE_NODUMP = 6, /* do not dump file */ 440 EXT4_INODE_NOATIME = 7, /* do not update atime */ 441 /* Reserved for compression usage... */ 442 EXT4_INODE_DIRTY = 8, 443 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 444 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 445 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 446 /* End compression flags --- maybe not all used */ 447 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 448 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 449 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 450 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 451 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 452 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 453 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 454 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 455 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 456 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 457 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 458 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 459 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 460 }; 461 462 /* 463 * Since it's pretty easy to mix up bit numbers and hex values, we use a 464 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 465 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 466 * any extra space in the compiled kernel image, otherwise, the build will fail. 467 * It's important that these values are the same, since we are using 468 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 469 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 470 * values found in ext2, ext3 and ext4 filesystems, and of course the values 471 * defined in e2fsprogs. 472 * 473 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 474 */ 475 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 476 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 477 478 static inline void ext4_check_flag_values(void) 479 { 480 CHECK_FLAG_VALUE(SECRM); 481 CHECK_FLAG_VALUE(UNRM); 482 CHECK_FLAG_VALUE(COMPR); 483 CHECK_FLAG_VALUE(SYNC); 484 CHECK_FLAG_VALUE(IMMUTABLE); 485 CHECK_FLAG_VALUE(APPEND); 486 CHECK_FLAG_VALUE(NODUMP); 487 CHECK_FLAG_VALUE(NOATIME); 488 CHECK_FLAG_VALUE(DIRTY); 489 CHECK_FLAG_VALUE(COMPRBLK); 490 CHECK_FLAG_VALUE(NOCOMPR); 491 CHECK_FLAG_VALUE(ENCRYPT); 492 CHECK_FLAG_VALUE(INDEX); 493 CHECK_FLAG_VALUE(IMAGIC); 494 CHECK_FLAG_VALUE(JOURNAL_DATA); 495 CHECK_FLAG_VALUE(NOTAIL); 496 CHECK_FLAG_VALUE(DIRSYNC); 497 CHECK_FLAG_VALUE(TOPDIR); 498 CHECK_FLAG_VALUE(HUGE_FILE); 499 CHECK_FLAG_VALUE(EXTENTS); 500 CHECK_FLAG_VALUE(EA_INODE); 501 CHECK_FLAG_VALUE(EOFBLOCKS); 502 CHECK_FLAG_VALUE(INLINE_DATA); 503 CHECK_FLAG_VALUE(PROJINHERIT); 504 CHECK_FLAG_VALUE(RESERVED); 505 } 506 507 /* Used to pass group descriptor data when online resize is done */ 508 struct ext4_new_group_input { 509 __u32 group; /* Group number for this data */ 510 __u64 block_bitmap; /* Absolute block number of block bitmap */ 511 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 512 __u64 inode_table; /* Absolute block number of inode table start */ 513 __u32 blocks_count; /* Total number of blocks in this group */ 514 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 515 __u16 unused; 516 }; 517 518 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 519 struct compat_ext4_new_group_input { 520 u32 group; 521 compat_u64 block_bitmap; 522 compat_u64 inode_bitmap; 523 compat_u64 inode_table; 524 u32 blocks_count; 525 u16 reserved_blocks; 526 u16 unused; 527 }; 528 #endif 529 530 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 531 struct ext4_new_group_data { 532 __u32 group; 533 __u64 block_bitmap; 534 __u64 inode_bitmap; 535 __u64 inode_table; 536 __u32 blocks_count; 537 __u16 reserved_blocks; 538 __u16 unused; 539 __u32 free_blocks_count; 540 }; 541 542 /* Indexes used to index group tables in ext4_new_group_data */ 543 enum { 544 BLOCK_BITMAP = 0, /* block bitmap */ 545 INODE_BITMAP, /* inode bitmap */ 546 INODE_TABLE, /* inode tables */ 547 GROUP_TABLE_COUNT, 548 }; 549 550 /* 551 * Flags used by ext4_map_blocks() 552 */ 553 /* Allocate any needed blocks and/or convert an unwritten 554 extent to be an initialized ext4 */ 555 #define EXT4_GET_BLOCKS_CREATE 0x0001 556 /* Request the creation of an unwritten extent */ 557 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 558 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 559 EXT4_GET_BLOCKS_CREATE) 560 /* Caller is from the delayed allocation writeout path 561 * finally doing the actual allocation of delayed blocks */ 562 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 563 /* caller is from the direct IO path, request to creation of an 564 unwritten extents if not allocated, split the unwritten 565 extent if blocks has been preallocated already*/ 566 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 567 #define EXT4_GET_BLOCKS_CONVERT 0x0010 568 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 569 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 570 /* Convert extent to initialized after IO complete */ 571 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 572 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 573 /* Eventual metadata allocation (due to growing extent tree) 574 * should not fail, so try to use reserved blocks for that.*/ 575 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 576 /* Don't normalize allocation size (used for fallocate) */ 577 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 578 /* Request will not result in inode size update (user for fallocate) */ 579 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 580 /* Convert written extents to unwritten */ 581 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 582 /* Write zeros to newly created written extents */ 583 #define EXT4_GET_BLOCKS_ZERO 0x0200 584 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 585 EXT4_GET_BLOCKS_ZERO) 586 /* Caller will submit data before dropping transaction handle. This 587 * allows jbd2 to avoid submitting data before commit. */ 588 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 589 590 /* 591 * The bit position of these flags must not overlap with any of the 592 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 593 * read_extent_tree_block(), ext4_split_extent_at(), 594 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 595 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 596 * caching the extents when reading from the extent tree while a 597 * truncate or punch hole operation is in progress. 598 */ 599 #define EXT4_EX_NOCACHE 0x40000000 600 #define EXT4_EX_FORCE_CACHE 0x20000000 601 602 /* 603 * Flags used by ext4_free_blocks 604 */ 605 #define EXT4_FREE_BLOCKS_METADATA 0x0001 606 #define EXT4_FREE_BLOCKS_FORGET 0x0002 607 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 608 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 609 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 610 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 611 612 /* 613 * ioctl commands 614 */ 615 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 616 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 617 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 618 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 619 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 620 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 621 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 622 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 623 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 624 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 625 #define EXT4_IOC_MIGRATE _IO('f', 9) 626 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 627 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 628 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 629 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 630 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 631 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 632 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 633 #define EXT4_IOC_SET_ENCRYPTION_POLICY FS_IOC_SET_ENCRYPTION_POLICY 634 #define EXT4_IOC_GET_ENCRYPTION_PWSALT FS_IOC_GET_ENCRYPTION_PWSALT 635 #define EXT4_IOC_GET_ENCRYPTION_POLICY FS_IOC_GET_ENCRYPTION_POLICY 636 637 #ifndef FS_IOC_FSGETXATTR 638 /* Until the uapi changes get merged for project quota... */ 639 640 #define FS_IOC_FSGETXATTR _IOR('X', 31, struct fsxattr) 641 #define FS_IOC_FSSETXATTR _IOW('X', 32, struct fsxattr) 642 643 /* 644 * Structure for FS_IOC_FSGETXATTR and FS_IOC_FSSETXATTR. 645 */ 646 struct fsxattr { 647 __u32 fsx_xflags; /* xflags field value (get/set) */ 648 __u32 fsx_extsize; /* extsize field value (get/set)*/ 649 __u32 fsx_nextents; /* nextents field value (get) */ 650 __u32 fsx_projid; /* project identifier (get/set) */ 651 unsigned char fsx_pad[12]; 652 }; 653 654 /* 655 * Flags for the fsx_xflags field 656 */ 657 #define FS_XFLAG_REALTIME 0x00000001 /* data in realtime volume */ 658 #define FS_XFLAG_PREALLOC 0x00000002 /* preallocated file extents */ 659 #define FS_XFLAG_IMMUTABLE 0x00000008 /* file cannot be modified */ 660 #define FS_XFLAG_APPEND 0x00000010 /* all writes append */ 661 #define FS_XFLAG_SYNC 0x00000020 /* all writes synchronous */ 662 #define FS_XFLAG_NOATIME 0x00000040 /* do not update access time */ 663 #define FS_XFLAG_NODUMP 0x00000080 /* do not include in backups */ 664 #define FS_XFLAG_RTINHERIT 0x00000100 /* create with rt bit set */ 665 #define FS_XFLAG_PROJINHERIT 0x00000200 /* create with parents projid */ 666 #define FS_XFLAG_NOSYMLINKS 0x00000400 /* disallow symlink creation */ 667 #define FS_XFLAG_EXTSIZE 0x00000800 /* extent size allocator hint */ 668 #define FS_XFLAG_EXTSZINHERIT 0x00001000 /* inherit inode extent size */ 669 #define FS_XFLAG_NODEFRAG 0x00002000 /* do not defragment */ 670 #define FS_XFLAG_FILESTREAM 0x00004000 /* use filestream allocator */ 671 #define FS_XFLAG_HASATTR 0x80000000 /* no DIFLAG for this */ 672 #endif /* !defined(FS_IOC_FSGETXATTR) */ 673 674 #define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR 675 #define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR 676 677 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 678 /* 679 * ioctl commands in 32 bit emulation 680 */ 681 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 682 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 683 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 684 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 685 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 686 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 687 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 688 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 689 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 690 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 691 #endif 692 693 /* Max physical block we can address w/o extents */ 694 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 695 696 /* 697 * Structure of an inode on the disk 698 */ 699 struct ext4_inode { 700 __le16 i_mode; /* File mode */ 701 __le16 i_uid; /* Low 16 bits of Owner Uid */ 702 __le32 i_size_lo; /* Size in bytes */ 703 __le32 i_atime; /* Access time */ 704 __le32 i_ctime; /* Inode Change time */ 705 __le32 i_mtime; /* Modification time */ 706 __le32 i_dtime; /* Deletion Time */ 707 __le16 i_gid; /* Low 16 bits of Group Id */ 708 __le16 i_links_count; /* Links count */ 709 __le32 i_blocks_lo; /* Blocks count */ 710 __le32 i_flags; /* File flags */ 711 union { 712 struct { 713 __le32 l_i_version; 714 } linux1; 715 struct { 716 __u32 h_i_translator; 717 } hurd1; 718 struct { 719 __u32 m_i_reserved1; 720 } masix1; 721 } osd1; /* OS dependent 1 */ 722 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 723 __le32 i_generation; /* File version (for NFS) */ 724 __le32 i_file_acl_lo; /* File ACL */ 725 __le32 i_size_high; 726 __le32 i_obso_faddr; /* Obsoleted fragment address */ 727 union { 728 struct { 729 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 730 __le16 l_i_file_acl_high; 731 __le16 l_i_uid_high; /* these 2 fields */ 732 __le16 l_i_gid_high; /* were reserved2[0] */ 733 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 734 __le16 l_i_reserved; 735 } linux2; 736 struct { 737 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 738 __u16 h_i_mode_high; 739 __u16 h_i_uid_high; 740 __u16 h_i_gid_high; 741 __u32 h_i_author; 742 } hurd2; 743 struct { 744 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 745 __le16 m_i_file_acl_high; 746 __u32 m_i_reserved2[2]; 747 } masix2; 748 } osd2; /* OS dependent 2 */ 749 __le16 i_extra_isize; 750 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 751 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 752 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 753 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 754 __le32 i_crtime; /* File Creation time */ 755 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 756 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 757 __le32 i_projid; /* Project ID */ 758 }; 759 760 struct move_extent { 761 __u32 reserved; /* should be zero */ 762 __u32 donor_fd; /* donor file descriptor */ 763 __u64 orig_start; /* logical start offset in block for orig */ 764 __u64 donor_start; /* logical start offset in block for donor */ 765 __u64 len; /* block length to be moved */ 766 __u64 moved_len; /* moved block length */ 767 }; 768 769 #define EXT4_EPOCH_BITS 2 770 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 771 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 772 773 /* 774 * Extended fields will fit into an inode if the filesystem was formatted 775 * with large inodes (-I 256 or larger) and there are not currently any EAs 776 * consuming all of the available space. For new inodes we always reserve 777 * enough space for the kernel's known extended fields, but for inodes 778 * created with an old kernel this might not have been the case. None of 779 * the extended inode fields is critical for correct filesystem operation. 780 * This macro checks if a certain field fits in the inode. Note that 781 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 782 */ 783 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 784 ((offsetof(typeof(*ext4_inode), field) + \ 785 sizeof((ext4_inode)->field)) \ 786 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 787 (einode)->i_extra_isize)) \ 788 789 /* 790 * We use an encoding that preserves the times for extra epoch "00": 791 * 792 * extra msb of adjust for signed 793 * epoch 32-bit 32-bit tv_sec to 794 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 795 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 796 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 797 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 798 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 799 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 800 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 801 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 802 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 803 * 804 * Note that previous versions of the kernel on 64-bit systems would 805 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 806 * 1970. e2fsck will correct this, assuming that it is run on the 807 * affected filesystem before 2242. 808 */ 809 810 static inline __le32 ext4_encode_extra_time(struct timespec *time) 811 { 812 u32 extra = sizeof(time->tv_sec) > 4 ? 813 ((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK : 0; 814 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); 815 } 816 817 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 818 { 819 if (unlikely(sizeof(time->tv_sec) > 4 && 820 (extra & cpu_to_le32(EXT4_EPOCH_MASK)))) { 821 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,20,0) 822 /* Handle legacy encoding of pre-1970 dates with epoch 823 * bits 1,1. We assume that by kernel version 4.20, 824 * everyone will have run fsck over the affected 825 * filesystems to correct the problem. (This 826 * backwards compatibility may be removed before this 827 * time, at the discretion of the ext4 developers.) 828 */ 829 u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK; 830 if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0) 831 extra_bits = 0; 832 time->tv_sec += extra_bits << 32; 833 #else 834 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 835 #endif 836 } 837 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 838 } 839 840 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 841 do { \ 842 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 843 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 844 (raw_inode)->xtime ## _extra = \ 845 ext4_encode_extra_time(&(inode)->xtime); \ 846 } while (0) 847 848 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 849 do { \ 850 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 851 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 852 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 853 (raw_inode)->xtime ## _extra = \ 854 ext4_encode_extra_time(&(einode)->xtime); \ 855 } while (0) 856 857 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 858 do { \ 859 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 860 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 861 ext4_decode_extra_time(&(inode)->xtime, \ 862 raw_inode->xtime ## _extra); \ 863 else \ 864 (inode)->xtime.tv_nsec = 0; \ 865 } while (0) 866 867 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 868 do { \ 869 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 870 (einode)->xtime.tv_sec = \ 871 (signed)le32_to_cpu((raw_inode)->xtime); \ 872 else \ 873 (einode)->xtime.tv_sec = 0; \ 874 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 875 ext4_decode_extra_time(&(einode)->xtime, \ 876 raw_inode->xtime ## _extra); \ 877 else \ 878 (einode)->xtime.tv_nsec = 0; \ 879 } while (0) 880 881 #define i_disk_version osd1.linux1.l_i_version 882 883 #if defined(__KERNEL__) || defined(__linux__) 884 #define i_reserved1 osd1.linux1.l_i_reserved1 885 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 886 #define i_blocks_high osd2.linux2.l_i_blocks_high 887 #define i_uid_low i_uid 888 #define i_gid_low i_gid 889 #define i_uid_high osd2.linux2.l_i_uid_high 890 #define i_gid_high osd2.linux2.l_i_gid_high 891 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 892 893 #elif defined(__GNU__) 894 895 #define i_translator osd1.hurd1.h_i_translator 896 #define i_uid_high osd2.hurd2.h_i_uid_high 897 #define i_gid_high osd2.hurd2.h_i_gid_high 898 #define i_author osd2.hurd2.h_i_author 899 900 #elif defined(__masix__) 901 902 #define i_reserved1 osd1.masix1.m_i_reserved1 903 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 904 #define i_reserved2 osd2.masix2.m_i_reserved2 905 906 #endif /* defined(__KERNEL__) || defined(__linux__) */ 907 908 #include "extents_status.h" 909 910 /* 911 * Lock subclasses for i_data_sem in the ext4_inode_info structure. 912 * 913 * These are needed to avoid lockdep false positives when we need to 914 * allocate blocks to the quota inode during ext4_map_blocks(), while 915 * holding i_data_sem for a normal (non-quota) inode. Since we don't 916 * do quota tracking for the quota inode, this avoids deadlock (as 917 * well as infinite recursion, since it isn't turtles all the way 918 * down...) 919 * 920 * I_DATA_SEM_NORMAL - Used for most inodes 921 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode 922 * where the second inode has larger inode number 923 * than the first 924 * I_DATA_SEM_QUOTA - Used for quota inodes only 925 */ 926 enum { 927 I_DATA_SEM_NORMAL = 0, 928 I_DATA_SEM_OTHER, 929 I_DATA_SEM_QUOTA, 930 }; 931 932 933 /* 934 * fourth extended file system inode data in memory 935 */ 936 struct ext4_inode_info { 937 __le32 i_data[15]; /* unconverted */ 938 __u32 i_dtime; 939 ext4_fsblk_t i_file_acl; 940 941 /* 942 * i_block_group is the number of the block group which contains 943 * this file's inode. Constant across the lifetime of the inode, 944 * it is ued for making block allocation decisions - we try to 945 * place a file's data blocks near its inode block, and new inodes 946 * near to their parent directory's inode. 947 */ 948 ext4_group_t i_block_group; 949 ext4_lblk_t i_dir_start_lookup; 950 #if (BITS_PER_LONG < 64) 951 unsigned long i_state_flags; /* Dynamic state flags */ 952 #endif 953 unsigned long i_flags; 954 955 /* 956 * Extended attributes can be read independently of the main file 957 * data. Taking i_mutex even when reading would cause contention 958 * between readers of EAs and writers of regular file data, so 959 * instead we synchronize on xattr_sem when reading or changing 960 * EAs. 961 */ 962 struct rw_semaphore xattr_sem; 963 964 struct list_head i_orphan; /* unlinked but open inodes */ 965 966 /* 967 * i_disksize keeps track of what the inode size is ON DISK, not 968 * in memory. During truncate, i_size is set to the new size by 969 * the VFS prior to calling ext4_truncate(), but the filesystem won't 970 * set i_disksize to 0 until the truncate is actually under way. 971 * 972 * The intent is that i_disksize always represents the blocks which 973 * are used by this file. This allows recovery to restart truncate 974 * on orphans if we crash during truncate. We actually write i_disksize 975 * into the on-disk inode when writing inodes out, instead of i_size. 976 * 977 * The only time when i_disksize and i_size may be different is when 978 * a truncate is in progress. The only things which change i_disksize 979 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 980 */ 981 loff_t i_disksize; 982 983 /* 984 * i_data_sem is for serialising ext4_truncate() against 985 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 986 * data tree are chopped off during truncate. We can't do that in 987 * ext4 because whenever we perform intermediate commits during 988 * truncate, the inode and all the metadata blocks *must* be in a 989 * consistent state which allows truncation of the orphans to restart 990 * during recovery. Hence we must fix the get_block-vs-truncate race 991 * by other means, so we have i_data_sem. 992 */ 993 struct rw_semaphore i_data_sem; 994 /* 995 * i_mmap_sem is for serializing page faults with truncate / punch hole 996 * operations. We have to make sure that new page cannot be faulted in 997 * a section of the inode that is being punched. We cannot easily use 998 * i_data_sem for this since we need protection for the whole punch 999 * operation and i_data_sem ranks below transaction start so we have 1000 * to occasionally drop it. 1001 */ 1002 struct rw_semaphore i_mmap_sem; 1003 struct inode vfs_inode; 1004 struct jbd2_inode *jinode; 1005 1006 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 1007 1008 /* 1009 * File creation time. Its function is same as that of 1010 * struct timespec i_{a,c,m}time in the generic inode. 1011 */ 1012 struct timespec i_crtime; 1013 1014 /* mballoc */ 1015 struct list_head i_prealloc_list; 1016 spinlock_t i_prealloc_lock; 1017 1018 /* extents status tree */ 1019 struct ext4_es_tree i_es_tree; 1020 rwlock_t i_es_lock; 1021 struct list_head i_es_list; 1022 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1023 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1024 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1025 extents to shrink. Protected by 1026 i_es_lock */ 1027 1028 /* ialloc */ 1029 ext4_group_t i_last_alloc_group; 1030 1031 /* allocation reservation info for delalloc */ 1032 /* In case of bigalloc, these refer to clusters rather than blocks */ 1033 unsigned int i_reserved_data_blocks; 1034 unsigned int i_reserved_meta_blocks; 1035 unsigned int i_allocated_meta_blocks; 1036 ext4_lblk_t i_da_metadata_calc_last_lblock; 1037 int i_da_metadata_calc_len; 1038 1039 /* on-disk additional length */ 1040 __u16 i_extra_isize; 1041 1042 /* Indicate the inline data space. */ 1043 u16 i_inline_off; 1044 u16 i_inline_size; 1045 1046 #ifdef CONFIG_QUOTA 1047 /* quota space reservation, managed internally by quota code */ 1048 qsize_t i_reserved_quota; 1049 #endif 1050 1051 /* Lock protecting lists below */ 1052 spinlock_t i_completed_io_lock; 1053 /* 1054 * Completed IOs that need unwritten extents handling and have 1055 * transaction reserved 1056 */ 1057 struct list_head i_rsv_conversion_list; 1058 struct work_struct i_rsv_conversion_work; 1059 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 1060 1061 spinlock_t i_block_reservation_lock; 1062 1063 /* 1064 * Transactions that contain inode's metadata needed to complete 1065 * fsync and fdatasync, respectively. 1066 */ 1067 tid_t i_sync_tid; 1068 tid_t i_datasync_tid; 1069 1070 #ifdef CONFIG_QUOTA 1071 struct dquot *i_dquot[MAXQUOTAS]; 1072 #endif 1073 1074 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1075 __u32 i_csum_seed; 1076 1077 kprojid_t i_projid; 1078 }; 1079 1080 /* 1081 * File system states 1082 */ 1083 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1084 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1085 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1086 1087 /* 1088 * Misc. filesystem flags 1089 */ 1090 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1091 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1092 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1093 1094 /* 1095 * Mount flags set via mount options or defaults 1096 */ 1097 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1098 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1099 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1100 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1101 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1102 #define EXT4_MOUNT_ERRORS_MASK 0x00070 1103 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1104 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1105 #ifdef CONFIG_FS_DAX 1106 #define EXT4_MOUNT_DAX 0x00200 /* Direct Access */ 1107 #else 1108 #define EXT4_MOUNT_DAX 0 1109 #endif 1110 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1111 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1112 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1113 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1114 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1115 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1116 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1117 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1118 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1119 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1120 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */ 1121 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota, 1122 * enable enforcement for hidden 1123 * quota files */ 1124 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable 1125 * enforcement for hidden quota 1126 * files */ 1127 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota 1128 * enforcement */ 1129 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1130 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1131 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1132 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1133 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1134 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1135 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1136 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1137 1138 /* 1139 * Mount flags set either automatically (could not be set by mount option) 1140 * based on per file system feature or property or in special cases such as 1141 * distinguishing between explicit mount option definition and default. 1142 */ 1143 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1144 specified delalloc */ 1145 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1146 size of blocksize * 8 1147 blocks */ 1148 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1149 file systems */ 1150 1151 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1152 specified journal checksum */ 1153 1154 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1155 ~EXT4_MOUNT_##opt 1156 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1157 EXT4_MOUNT_##opt 1158 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1159 EXT4_MOUNT_##opt) 1160 1161 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1162 ~EXT4_MOUNT2_##opt 1163 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1164 EXT4_MOUNT2_##opt 1165 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1166 EXT4_MOUNT2_##opt) 1167 1168 #define ext4_test_and_set_bit __test_and_set_bit_le 1169 #define ext4_set_bit __set_bit_le 1170 #define ext4_set_bit_atomic ext2_set_bit_atomic 1171 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1172 #define ext4_clear_bit __clear_bit_le 1173 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1174 #define ext4_test_bit test_bit_le 1175 #define ext4_find_next_zero_bit find_next_zero_bit_le 1176 #define ext4_find_next_bit find_next_bit_le 1177 1178 extern void ext4_set_bits(void *bm, int cur, int len); 1179 1180 /* 1181 * Maximal mount counts between two filesystem checks 1182 */ 1183 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1184 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1185 1186 /* 1187 * Behaviour when detecting errors 1188 */ 1189 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1190 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1191 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1192 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1193 1194 /* Metadata checksum algorithm codes */ 1195 #define EXT4_CRC32C_CHKSUM 1 1196 1197 /* 1198 * Structure of the super block 1199 */ 1200 struct ext4_super_block { 1201 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1202 __le32 s_blocks_count_lo; /* Blocks count */ 1203 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1204 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1205 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1206 __le32 s_first_data_block; /* First Data Block */ 1207 __le32 s_log_block_size; /* Block size */ 1208 __le32 s_log_cluster_size; /* Allocation cluster size */ 1209 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1210 __le32 s_clusters_per_group; /* # Clusters per group */ 1211 __le32 s_inodes_per_group; /* # Inodes per group */ 1212 __le32 s_mtime; /* Mount time */ 1213 /*30*/ __le32 s_wtime; /* Write time */ 1214 __le16 s_mnt_count; /* Mount count */ 1215 __le16 s_max_mnt_count; /* Maximal mount count */ 1216 __le16 s_magic; /* Magic signature */ 1217 __le16 s_state; /* File system state */ 1218 __le16 s_errors; /* Behaviour when detecting errors */ 1219 __le16 s_minor_rev_level; /* minor revision level */ 1220 /*40*/ __le32 s_lastcheck; /* time of last check */ 1221 __le32 s_checkinterval; /* max. time between checks */ 1222 __le32 s_creator_os; /* OS */ 1223 __le32 s_rev_level; /* Revision level */ 1224 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1225 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1226 /* 1227 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1228 * 1229 * Note: the difference between the compatible feature set and 1230 * the incompatible feature set is that if there is a bit set 1231 * in the incompatible feature set that the kernel doesn't 1232 * know about, it should refuse to mount the filesystem. 1233 * 1234 * e2fsck's requirements are more strict; if it doesn't know 1235 * about a feature in either the compatible or incompatible 1236 * feature set, it must abort and not try to meddle with 1237 * things it doesn't understand... 1238 */ 1239 __le32 s_first_ino; /* First non-reserved inode */ 1240 __le16 s_inode_size; /* size of inode structure */ 1241 __le16 s_block_group_nr; /* block group # of this superblock */ 1242 __le32 s_feature_compat; /* compatible feature set */ 1243 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1244 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1245 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1246 /*78*/ char s_volume_name[16]; /* volume name */ 1247 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 1248 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1249 /* 1250 * Performance hints. Directory preallocation should only 1251 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1252 */ 1253 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1254 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1255 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1256 /* 1257 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1258 */ 1259 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1260 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1261 __le32 s_journal_dev; /* device number of journal file */ 1262 __le32 s_last_orphan; /* start of list of inodes to delete */ 1263 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1264 __u8 s_def_hash_version; /* Default hash version to use */ 1265 __u8 s_jnl_backup_type; 1266 __le16 s_desc_size; /* size of group descriptor */ 1267 /*100*/ __le32 s_default_mount_opts; 1268 __le32 s_first_meta_bg; /* First metablock block group */ 1269 __le32 s_mkfs_time; /* When the filesystem was created */ 1270 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1271 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1272 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1273 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1274 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1275 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1276 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1277 __le32 s_flags; /* Miscellaneous flags */ 1278 __le16 s_raid_stride; /* RAID stride */ 1279 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1280 __le64 s_mmp_block; /* Block for multi-mount protection */ 1281 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1282 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1283 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1284 __u8 s_encryption_level; /* versioning level for encryption */ 1285 __u8 s_reserved_pad; /* Padding to next 32bits */ 1286 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1287 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1288 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1289 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1290 snapshot's future use */ 1291 __le32 s_snapshot_list; /* inode number of the head of the 1292 on-disk snapshot list */ 1293 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1294 __le32 s_error_count; /* number of fs errors */ 1295 __le32 s_first_error_time; /* first time an error happened */ 1296 __le32 s_first_error_ino; /* inode involved in first error */ 1297 __le64 s_first_error_block; /* block involved of first error */ 1298 __u8 s_first_error_func[32]; /* function where the error happened */ 1299 __le32 s_first_error_line; /* line number where error happened */ 1300 __le32 s_last_error_time; /* most recent time of an error */ 1301 __le32 s_last_error_ino; /* inode involved in last error */ 1302 __le32 s_last_error_line; /* line number where error happened */ 1303 __le64 s_last_error_block; /* block involved of last error */ 1304 __u8 s_last_error_func[32]; /* function where the error happened */ 1305 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1306 __u8 s_mount_opts[64]; 1307 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1308 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1309 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1310 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1311 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1312 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1313 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1314 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1315 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1316 __le32 s_reserved[98]; /* Padding to the end of the block */ 1317 __le32 s_checksum; /* crc32c(superblock) */ 1318 }; 1319 1320 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1321 1322 #ifdef __KERNEL__ 1323 1324 /* 1325 * run-time mount flags 1326 */ 1327 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1328 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1329 #define EXT4_MF_TEST_DUMMY_ENCRYPTION 0x0004 1330 1331 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1332 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \ 1333 EXT4_MF_TEST_DUMMY_ENCRYPTION)) 1334 #else 1335 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0) 1336 #endif 1337 1338 /* Number of quota types we support */ 1339 #define EXT4_MAXQUOTAS 3 1340 1341 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1342 #define EXT4_KEY_DESC_PREFIX "ext4:" 1343 #define EXT4_KEY_DESC_PREFIX_SIZE 5 1344 #endif 1345 1346 /* 1347 * fourth extended-fs super-block data in memory 1348 */ 1349 struct ext4_sb_info { 1350 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1351 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1352 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1353 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1354 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1355 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1356 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1357 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1358 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1359 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1360 unsigned long s_overhead; /* # of fs overhead clusters */ 1361 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1362 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1363 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1364 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1365 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1366 struct buffer_head **s_group_desc; 1367 unsigned int s_mount_opt; 1368 unsigned int s_mount_opt2; 1369 unsigned int s_mount_flags; 1370 unsigned int s_def_mount_opt; 1371 ext4_fsblk_t s_sb_block; 1372 atomic64_t s_resv_clusters; 1373 kuid_t s_resuid; 1374 kgid_t s_resgid; 1375 unsigned short s_mount_state; 1376 unsigned short s_pad; 1377 int s_addr_per_block_bits; 1378 int s_desc_per_block_bits; 1379 int s_inode_size; 1380 int s_first_ino; 1381 unsigned int s_inode_readahead_blks; 1382 unsigned int s_inode_goal; 1383 spinlock_t s_next_gen_lock; 1384 u32 s_next_generation; 1385 u32 s_hash_seed[4]; 1386 int s_def_hash_version; 1387 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1388 struct percpu_counter s_freeclusters_counter; 1389 struct percpu_counter s_freeinodes_counter; 1390 struct percpu_counter s_dirs_counter; 1391 struct percpu_counter s_dirtyclusters_counter; 1392 struct blockgroup_lock *s_blockgroup_lock; 1393 struct proc_dir_entry *s_proc; 1394 struct kobject s_kobj; 1395 struct completion s_kobj_unregister; 1396 struct super_block *s_sb; 1397 1398 /* Journaling */ 1399 struct journal_s *s_journal; 1400 struct list_head s_orphan; 1401 struct mutex s_orphan_lock; 1402 unsigned long s_resize_flags; /* Flags indicating if there 1403 is a resizer */ 1404 unsigned long s_commit_interval; 1405 u32 s_max_batch_time; 1406 u32 s_min_batch_time; 1407 struct block_device *journal_bdev; 1408 #ifdef CONFIG_QUOTA 1409 char *s_qf_names[EXT4_MAXQUOTAS]; /* Names of quota files with journalled quota */ 1410 int s_jquota_fmt; /* Format of quota to use */ 1411 #endif 1412 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1413 struct rb_root system_blks; 1414 1415 #ifdef EXTENTS_STATS 1416 /* ext4 extents stats */ 1417 unsigned long s_ext_min; 1418 unsigned long s_ext_max; 1419 unsigned long s_depth_max; 1420 spinlock_t s_ext_stats_lock; 1421 unsigned long s_ext_blocks; 1422 unsigned long s_ext_extents; 1423 #endif 1424 1425 /* for buddy allocator */ 1426 struct ext4_group_info ***s_group_info; 1427 struct inode *s_buddy_cache; 1428 spinlock_t s_md_lock; 1429 unsigned short *s_mb_offsets; 1430 unsigned int *s_mb_maxs; 1431 unsigned int s_group_info_size; 1432 unsigned int s_mb_free_pending; 1433 1434 /* tunables */ 1435 unsigned long s_stripe; 1436 unsigned int s_mb_stream_request; 1437 unsigned int s_mb_max_to_scan; 1438 unsigned int s_mb_min_to_scan; 1439 unsigned int s_mb_stats; 1440 unsigned int s_mb_order2_reqs; 1441 unsigned int s_mb_group_prealloc; 1442 unsigned int s_max_dir_size_kb; 1443 /* where last allocation was done - for stream allocation */ 1444 unsigned long s_mb_last_group; 1445 unsigned long s_mb_last_start; 1446 1447 /* stats for buddy allocator */ 1448 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1449 atomic_t s_bal_success; /* we found long enough chunks */ 1450 atomic_t s_bal_allocated; /* in blocks */ 1451 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1452 atomic_t s_bal_goals; /* goal hits */ 1453 atomic_t s_bal_breaks; /* too long searches */ 1454 atomic_t s_bal_2orders; /* 2^order hits */ 1455 spinlock_t s_bal_lock; 1456 unsigned long s_mb_buddies_generated; 1457 unsigned long long s_mb_generation_time; 1458 atomic_t s_mb_lost_chunks; 1459 atomic_t s_mb_preallocated; 1460 atomic_t s_mb_discarded; 1461 atomic_t s_lock_busy; 1462 1463 /* locality groups */ 1464 struct ext4_locality_group __percpu *s_locality_groups; 1465 1466 /* for write statistics */ 1467 unsigned long s_sectors_written_start; 1468 u64 s_kbytes_written; 1469 1470 /* the size of zero-out chunk */ 1471 unsigned int s_extent_max_zeroout_kb; 1472 1473 unsigned int s_log_groups_per_flex; 1474 struct flex_groups *s_flex_groups; 1475 ext4_group_t s_flex_groups_allocated; 1476 1477 /* workqueue for reserved extent conversions (buffered io) */ 1478 struct workqueue_struct *rsv_conversion_wq; 1479 1480 /* timer for periodic error stats printing */ 1481 struct timer_list s_err_report; 1482 1483 /* Lazy inode table initialization info */ 1484 struct ext4_li_request *s_li_request; 1485 /* Wait multiplier for lazy initialization thread */ 1486 unsigned int s_li_wait_mult; 1487 1488 /* Kernel thread for multiple mount protection */ 1489 struct task_struct *s_mmp_tsk; 1490 1491 /* record the last minlen when FITRIM is called. */ 1492 atomic_t s_last_trim_minblks; 1493 1494 /* Reference to checksum algorithm driver via cryptoapi */ 1495 struct crypto_shash *s_chksum_driver; 1496 1497 /* Precomputed FS UUID checksum for seeding other checksums */ 1498 __u32 s_csum_seed; 1499 1500 /* Reclaim extents from extent status tree */ 1501 struct shrinker s_es_shrinker; 1502 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1503 long s_es_nr_inode; 1504 struct ext4_es_stats s_es_stats; 1505 struct mb_cache *s_mb_cache; 1506 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1507 1508 /* Ratelimit ext4 messages. */ 1509 struct ratelimit_state s_err_ratelimit_state; 1510 struct ratelimit_state s_warning_ratelimit_state; 1511 struct ratelimit_state s_msg_ratelimit_state; 1512 1513 /* Barrier between changing inodes' journal flags and writepages ops. */ 1514 struct percpu_rw_semaphore s_journal_flag_rwsem; 1515 1516 /* Encryption support */ 1517 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1518 u8 key_prefix[EXT4_KEY_DESC_PREFIX_SIZE]; 1519 u8 key_prefix_size; 1520 #endif 1521 }; 1522 1523 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1524 { 1525 return sb->s_fs_info; 1526 } 1527 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1528 { 1529 return container_of(inode, struct ext4_inode_info, vfs_inode); 1530 } 1531 1532 static inline struct timespec ext4_current_time(struct inode *inode) 1533 { 1534 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1535 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1536 } 1537 1538 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1539 { 1540 return ino == EXT4_ROOT_INO || 1541 ino == EXT4_USR_QUOTA_INO || 1542 ino == EXT4_GRP_QUOTA_INO || 1543 ino == EXT4_BOOT_LOADER_INO || 1544 ino == EXT4_JOURNAL_INO || 1545 ino == EXT4_RESIZE_INO || 1546 (ino >= EXT4_FIRST_INO(sb) && 1547 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1548 } 1549 1550 /* 1551 * Inode dynamic state flags 1552 */ 1553 enum { 1554 EXT4_STATE_JDATA, /* journaled data exists */ 1555 EXT4_STATE_NEW, /* inode is newly created */ 1556 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1557 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1558 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1559 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1560 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1561 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1562 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read 1563 nolocking */ 1564 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1565 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1566 }; 1567 1568 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1569 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1570 { \ 1571 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1572 } \ 1573 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1574 { \ 1575 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1576 } \ 1577 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1578 { \ 1579 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1580 } 1581 1582 /* Add these declarations here only so that these functions can be 1583 * found by name. Otherwise, they are very hard to locate. */ 1584 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1585 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1586 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1587 EXT4_INODE_BIT_FNS(flag, flags, 0) 1588 1589 /* Add these declarations here only so that these functions can be 1590 * found by name. Otherwise, they are very hard to locate. */ 1591 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1592 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1593 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1594 #if (BITS_PER_LONG < 64) 1595 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1596 1597 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1598 { 1599 (ei)->i_state_flags = 0; 1600 } 1601 #else 1602 EXT4_INODE_BIT_FNS(state, flags, 32) 1603 1604 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1605 { 1606 /* We depend on the fact that callers will set i_flags */ 1607 } 1608 #endif 1609 #else 1610 /* Assume that user mode programs are passing in an ext4fs superblock, not 1611 * a kernel struct super_block. This will allow us to call the feature-test 1612 * macros from user land. */ 1613 #define EXT4_SB(sb) (sb) 1614 #endif 1615 1616 /* 1617 * Returns true if the inode is inode is encrypted 1618 */ 1619 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1620 1621 /* 1622 * Codes for operating systems 1623 */ 1624 #define EXT4_OS_LINUX 0 1625 #define EXT4_OS_HURD 1 1626 #define EXT4_OS_MASIX 2 1627 #define EXT4_OS_FREEBSD 3 1628 #define EXT4_OS_LITES 4 1629 1630 /* 1631 * Revision levels 1632 */ 1633 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1634 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1635 1636 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1637 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1638 1639 #define EXT4_GOOD_OLD_INODE_SIZE 128 1640 1641 /* 1642 * Feature set definitions 1643 */ 1644 1645 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1646 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1647 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1648 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1649 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1650 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1651 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1652 1653 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1654 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1655 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1656 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1657 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1658 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1659 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1660 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1661 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1662 /* 1663 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1664 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1665 * all other data structures' checksums. However, the METADATA_CSUM and 1666 * GDT_CSUM bits are mutually exclusive. 1667 */ 1668 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1669 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1670 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 1671 1672 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1673 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1674 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1675 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1676 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1677 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1678 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1679 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1680 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1681 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1682 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1683 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 1684 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1685 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1686 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1687 1688 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 1689 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1690 { \ 1691 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1692 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 1693 } \ 1694 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1695 { \ 1696 EXT4_SB(sb)->s_es->s_feature_compat |= \ 1697 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1698 } \ 1699 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1700 { \ 1701 EXT4_SB(sb)->s_es->s_feature_compat &= \ 1702 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1703 } 1704 1705 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 1706 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1707 { \ 1708 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1709 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 1710 } \ 1711 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1712 { \ 1713 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 1714 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1715 } \ 1716 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1717 { \ 1718 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 1719 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1720 } 1721 1722 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 1723 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1724 { \ 1725 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1726 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 1727 } \ 1728 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1729 { \ 1730 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 1731 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1732 } \ 1733 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1734 { \ 1735 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 1736 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1737 } 1738 1739 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 1740 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 1741 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 1742 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 1743 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 1744 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 1745 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 1746 1747 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 1748 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 1749 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 1750 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 1751 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 1752 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 1753 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 1754 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 1755 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 1756 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 1757 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 1758 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 1759 1760 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 1761 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 1762 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 1763 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 1764 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 1765 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 1766 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 1767 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 1768 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 1769 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 1770 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 1771 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 1772 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 1773 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 1774 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 1775 1776 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1777 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1778 EXT4_FEATURE_INCOMPAT_META_BG) 1779 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1780 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1781 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1782 1783 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1784 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1785 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1786 EXT4_FEATURE_INCOMPAT_META_BG) 1787 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1788 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1789 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1790 1791 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1792 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1793 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1794 EXT4_FEATURE_INCOMPAT_META_BG| \ 1795 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1796 EXT4_FEATURE_INCOMPAT_64BIT| \ 1797 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1798 EXT4_FEATURE_INCOMPAT_MMP | \ 1799 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 1800 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 1801 EXT4_FEATURE_INCOMPAT_CSUM_SEED) 1802 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1803 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1804 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1805 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1806 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1807 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1808 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1809 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1810 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1811 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 1812 EXT4_FEATURE_RO_COMPAT_PROJECT) 1813 1814 #define EXTN_FEATURE_FUNCS(ver) \ 1815 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 1816 { \ 1817 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1818 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 1819 } \ 1820 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 1821 { \ 1822 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1823 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 1824 } \ 1825 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 1826 { \ 1827 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1828 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 1829 } 1830 1831 EXTN_FEATURE_FUNCS(2) 1832 EXTN_FEATURE_FUNCS(3) 1833 EXTN_FEATURE_FUNCS(4) 1834 1835 static inline bool ext4_has_compat_features(struct super_block *sb) 1836 { 1837 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 1838 } 1839 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 1840 { 1841 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 1842 } 1843 static inline bool ext4_has_incompat_features(struct super_block *sb) 1844 { 1845 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 1846 } 1847 1848 /* 1849 * Default values for user and/or group using reserved blocks 1850 */ 1851 #define EXT4_DEF_RESUID 0 1852 #define EXT4_DEF_RESGID 0 1853 1854 /* 1855 * Default project ID 1856 */ 1857 #define EXT4_DEF_PROJID 0 1858 1859 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1860 1861 /* 1862 * Default mount options 1863 */ 1864 #define EXT4_DEFM_DEBUG 0x0001 1865 #define EXT4_DEFM_BSDGROUPS 0x0002 1866 #define EXT4_DEFM_XATTR_USER 0x0004 1867 #define EXT4_DEFM_ACL 0x0008 1868 #define EXT4_DEFM_UID16 0x0010 1869 #define EXT4_DEFM_JMODE 0x0060 1870 #define EXT4_DEFM_JMODE_DATA 0x0020 1871 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1872 #define EXT4_DEFM_JMODE_WBACK 0x0060 1873 #define EXT4_DEFM_NOBARRIER 0x0100 1874 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1875 #define EXT4_DEFM_DISCARD 0x0400 1876 #define EXT4_DEFM_NODELALLOC 0x0800 1877 1878 /* 1879 * Default journal batch times 1880 */ 1881 #define EXT4_DEF_MIN_BATCH_TIME 0 1882 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1883 1884 /* 1885 * Minimum number of groups in a flexgroup before we separate out 1886 * directories into the first block group of a flexgroup 1887 */ 1888 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1889 1890 /* 1891 * Structure of a directory entry 1892 */ 1893 #define EXT4_NAME_LEN 255 1894 1895 struct ext4_dir_entry { 1896 __le32 inode; /* Inode number */ 1897 __le16 rec_len; /* Directory entry length */ 1898 __le16 name_len; /* Name length */ 1899 char name[EXT4_NAME_LEN]; /* File name */ 1900 }; 1901 1902 /* 1903 * The new version of the directory entry. Since EXT4 structures are 1904 * stored in intel byte order, and the name_len field could never be 1905 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1906 * file_type field. 1907 */ 1908 struct ext4_dir_entry_2 { 1909 __le32 inode; /* Inode number */ 1910 __le16 rec_len; /* Directory entry length */ 1911 __u8 name_len; /* Name length */ 1912 __u8 file_type; 1913 char name[EXT4_NAME_LEN]; /* File name */ 1914 }; 1915 1916 /* 1917 * This is a bogus directory entry at the end of each leaf block that 1918 * records checksums. 1919 */ 1920 struct ext4_dir_entry_tail { 1921 __le32 det_reserved_zero1; /* Pretend to be unused */ 1922 __le16 det_rec_len; /* 12 */ 1923 __u8 det_reserved_zero2; /* Zero name length */ 1924 __u8 det_reserved_ft; /* 0xDE, fake file type */ 1925 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1926 }; 1927 1928 #define EXT4_DIRENT_TAIL(block, blocksize) \ 1929 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 1930 ((blocksize) - \ 1931 sizeof(struct ext4_dir_entry_tail)))) 1932 1933 /* 1934 * Ext4 directory file types. Only the low 3 bits are used. The 1935 * other bits are reserved for now. 1936 */ 1937 #define EXT4_FT_UNKNOWN 0 1938 #define EXT4_FT_REG_FILE 1 1939 #define EXT4_FT_DIR 2 1940 #define EXT4_FT_CHRDEV 3 1941 #define EXT4_FT_BLKDEV 4 1942 #define EXT4_FT_FIFO 5 1943 #define EXT4_FT_SOCK 6 1944 #define EXT4_FT_SYMLINK 7 1945 1946 #define EXT4_FT_MAX 8 1947 1948 #define EXT4_FT_DIR_CSUM 0xDE 1949 1950 /* 1951 * EXT4_DIR_PAD defines the directory entries boundaries 1952 * 1953 * NOTE: It must be a multiple of 4 1954 */ 1955 #define EXT4_DIR_PAD 4 1956 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1957 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1958 ~EXT4_DIR_ROUND) 1959 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1960 1961 /* 1962 * If we ever get support for fs block sizes > page_size, we'll need 1963 * to remove the #if statements in the next two functions... 1964 */ 1965 static inline unsigned int 1966 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1967 { 1968 unsigned len = le16_to_cpu(dlen); 1969 1970 #if (PAGE_SIZE >= 65536) 1971 if (len == EXT4_MAX_REC_LEN || len == 0) 1972 return blocksize; 1973 return (len & 65532) | ((len & 3) << 16); 1974 #else 1975 return len; 1976 #endif 1977 } 1978 1979 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1980 { 1981 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1982 BUG(); 1983 #if (PAGE_SIZE >= 65536) 1984 if (len < 65536) 1985 return cpu_to_le16(len); 1986 if (len == blocksize) { 1987 if (blocksize == 65536) 1988 return cpu_to_le16(EXT4_MAX_REC_LEN); 1989 else 1990 return cpu_to_le16(0); 1991 } 1992 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 1993 #else 1994 return cpu_to_le16(len); 1995 #endif 1996 } 1997 1998 /* 1999 * Hash Tree Directory indexing 2000 * (c) Daniel Phillips, 2001 2001 */ 2002 2003 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2004 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2005 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 2006 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2007 2008 /* Legal values for the dx_root hash_version field: */ 2009 2010 #define DX_HASH_LEGACY 0 2011 #define DX_HASH_HALF_MD4 1 2012 #define DX_HASH_TEA 2 2013 #define DX_HASH_LEGACY_UNSIGNED 3 2014 #define DX_HASH_HALF_MD4_UNSIGNED 4 2015 #define DX_HASH_TEA_UNSIGNED 5 2016 2017 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 2018 const void *address, unsigned int length) 2019 { 2020 struct { 2021 struct shash_desc shash; 2022 char ctx[4]; 2023 } desc; 2024 int err; 2025 2026 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2027 2028 desc.shash.tfm = sbi->s_chksum_driver; 2029 desc.shash.flags = 0; 2030 *(u32 *)desc.ctx = crc; 2031 2032 err = crypto_shash_update(&desc.shash, address, length); 2033 BUG_ON(err); 2034 2035 return *(u32 *)desc.ctx; 2036 } 2037 2038 #ifdef __KERNEL__ 2039 2040 /* hash info structure used by the directory hash */ 2041 struct dx_hash_info 2042 { 2043 u32 hash; 2044 u32 minor_hash; 2045 int hash_version; 2046 u32 *seed; 2047 }; 2048 2049 2050 /* 32 and 64 bit signed EOF for dx directories */ 2051 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2052 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2053 2054 2055 /* 2056 * Control parameters used by ext4_htree_next_block 2057 */ 2058 #define HASH_NB_ALWAYS 1 2059 2060 struct ext4_filename { 2061 const struct qstr *usr_fname; 2062 struct fscrypt_str disk_name; 2063 struct dx_hash_info hinfo; 2064 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2065 struct fscrypt_str crypto_buf; 2066 #endif 2067 }; 2068 2069 #define fname_name(p) ((p)->disk_name.name) 2070 #define fname_len(p) ((p)->disk_name.len) 2071 2072 /* 2073 * Describe an inode's exact location on disk and in memory 2074 */ 2075 struct ext4_iloc 2076 { 2077 struct buffer_head *bh; 2078 unsigned long offset; 2079 ext4_group_t block_group; 2080 }; 2081 2082 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2083 { 2084 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2085 } 2086 2087 /* 2088 * This structure is stuffed into the struct file's private_data field 2089 * for directories. It is where we put information so that we can do 2090 * readdir operations in hash tree order. 2091 */ 2092 struct dir_private_info { 2093 struct rb_root root; 2094 struct rb_node *curr_node; 2095 struct fname *extra_fname; 2096 loff_t last_pos; 2097 __u32 curr_hash; 2098 __u32 curr_minor_hash; 2099 __u32 next_hash; 2100 }; 2101 2102 /* calculate the first block number of the group */ 2103 static inline ext4_fsblk_t 2104 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2105 { 2106 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2107 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2108 } 2109 2110 /* 2111 * Special error return code only used by dx_probe() and its callers. 2112 */ 2113 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2114 2115 /* 2116 * Timeout and state flag for lazy initialization inode thread. 2117 */ 2118 #define EXT4_DEF_LI_WAIT_MULT 10 2119 #define EXT4_DEF_LI_MAX_START_DELAY 5 2120 #define EXT4_LAZYINIT_QUIT 0x0001 2121 #define EXT4_LAZYINIT_RUNNING 0x0002 2122 2123 /* 2124 * Lazy inode table initialization info 2125 */ 2126 struct ext4_lazy_init { 2127 unsigned long li_state; 2128 struct list_head li_request_list; 2129 struct mutex li_list_mtx; 2130 }; 2131 2132 struct ext4_li_request { 2133 struct super_block *lr_super; 2134 struct ext4_sb_info *lr_sbi; 2135 ext4_group_t lr_next_group; 2136 struct list_head lr_request; 2137 unsigned long lr_next_sched; 2138 unsigned long lr_timeout; 2139 }; 2140 2141 struct ext4_features { 2142 struct kobject f_kobj; 2143 struct completion f_kobj_unregister; 2144 }; 2145 2146 /* 2147 * This structure will be used for multiple mount protection. It will be 2148 * written into the block number saved in the s_mmp_block field in the 2149 * superblock. Programs that check MMP should assume that if 2150 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2151 * to use the filesystem, regardless of how old the timestamp is. 2152 */ 2153 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2154 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2155 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2156 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2157 2158 struct mmp_struct { 2159 __le32 mmp_magic; /* Magic number for MMP */ 2160 __le32 mmp_seq; /* Sequence no. updated periodically */ 2161 2162 /* 2163 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2164 * purposes and do not affect the correctness of the algorithm 2165 */ 2166 __le64 mmp_time; /* Time last updated */ 2167 char mmp_nodename[64]; /* Node which last updated MMP block */ 2168 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2169 2170 /* 2171 * mmp_check_interval is used to verify if the MMP block has been 2172 * updated on the block device. The value is updated based on the 2173 * maximum time to write the MMP block during an update cycle. 2174 */ 2175 __le16 mmp_check_interval; 2176 2177 __le16 mmp_pad1; 2178 __le32 mmp_pad2[226]; 2179 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2180 }; 2181 2182 /* arguments passed to the mmp thread */ 2183 struct mmpd_data { 2184 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2185 struct super_block *sb; /* super block of the fs */ 2186 }; 2187 2188 /* 2189 * Check interval multiplier 2190 * The MMP block is written every update interval and initially checked every 2191 * update interval x the multiplier (the value is then adapted based on the 2192 * write latency). The reason is that writes can be delayed under load and we 2193 * don't want readers to incorrectly assume that the filesystem is no longer 2194 * in use. 2195 */ 2196 #define EXT4_MMP_CHECK_MULT 2UL 2197 2198 /* 2199 * Minimum interval for MMP checking in seconds. 2200 */ 2201 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2202 2203 /* 2204 * Maximum interval for MMP checking in seconds. 2205 */ 2206 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2207 2208 /* 2209 * Function prototypes 2210 */ 2211 2212 /* 2213 * Ok, these declarations are also in <linux/kernel.h> but none of the 2214 * ext4 source programs needs to include it so they are duplicated here. 2215 */ 2216 # define NORET_TYPE /**/ 2217 # define ATTRIB_NORET __attribute__((noreturn)) 2218 # define NORET_AND noreturn, 2219 2220 /* bitmap.c */ 2221 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2222 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2223 struct ext4_group_desc *gdp, 2224 struct buffer_head *bh, int sz); 2225 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2226 struct ext4_group_desc *gdp, 2227 struct buffer_head *bh, int sz); 2228 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2229 struct ext4_group_desc *gdp, 2230 struct buffer_head *bh); 2231 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2232 struct ext4_group_desc *gdp, 2233 struct buffer_head *bh); 2234 2235 /* balloc.c */ 2236 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2237 ext4_fsblk_t blocknr, 2238 ext4_group_t *blockgrpp, 2239 ext4_grpblk_t *offsetp); 2240 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2241 ext4_fsblk_t block); 2242 2243 extern unsigned int ext4_block_group(struct super_block *sb, 2244 ext4_fsblk_t blocknr); 2245 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2246 ext4_fsblk_t blocknr); 2247 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2248 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2249 ext4_group_t group); 2250 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2251 ext4_fsblk_t goal, 2252 unsigned int flags, 2253 unsigned long *count, 2254 int *errp); 2255 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2256 s64 nclusters, unsigned int flags); 2257 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2258 extern void ext4_check_blocks_bitmap(struct super_block *); 2259 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2260 ext4_group_t block_group, 2261 struct buffer_head ** bh); 2262 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2263 2264 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2265 ext4_group_t block_group); 2266 extern int ext4_wait_block_bitmap(struct super_block *sb, 2267 ext4_group_t block_group, 2268 struct buffer_head *bh); 2269 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2270 ext4_group_t block_group); 2271 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2272 ext4_group_t block_group, 2273 struct ext4_group_desc *gdp); 2274 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2275 2276 static inline int ext4_sb_has_crypto(struct super_block *sb) 2277 { 2278 return ext4_has_feature_encrypt(sb); 2279 } 2280 2281 static inline bool ext4_encrypted_inode(struct inode *inode) 2282 { 2283 return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT); 2284 } 2285 2286 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2287 static inline int ext4_fname_setup_filename(struct inode *dir, 2288 const struct qstr *iname, 2289 int lookup, struct ext4_filename *fname) 2290 { 2291 struct fscrypt_name name; 2292 int err; 2293 2294 memset(fname, 0, sizeof(struct ext4_filename)); 2295 2296 err = fscrypt_setup_filename(dir, iname, lookup, &name); 2297 2298 fname->usr_fname = name.usr_fname; 2299 fname->disk_name = name.disk_name; 2300 fname->hinfo.hash = name.hash; 2301 fname->hinfo.minor_hash = name.minor_hash; 2302 fname->crypto_buf = name.crypto_buf; 2303 return err; 2304 } 2305 2306 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2307 { 2308 struct fscrypt_name name; 2309 2310 name.crypto_buf = fname->crypto_buf; 2311 fscrypt_free_filename(&name); 2312 2313 fname->crypto_buf.name = NULL; 2314 fname->usr_fname = NULL; 2315 fname->disk_name.name = NULL; 2316 } 2317 #else 2318 static inline int ext4_fname_setup_filename(struct inode *dir, 2319 const struct qstr *iname, 2320 int lookup, struct ext4_filename *fname) 2321 { 2322 fname->usr_fname = iname; 2323 fname->disk_name.name = (unsigned char *) iname->name; 2324 fname->disk_name.len = iname->len; 2325 return 0; 2326 } 2327 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { } 2328 2329 #define fscrypt_set_d_op(i) 2330 #define fscrypt_get_ctx fscrypt_notsupp_get_ctx 2331 #define fscrypt_release_ctx fscrypt_notsupp_release_ctx 2332 #define fscrypt_encrypt_page fscrypt_notsupp_encrypt_page 2333 #define fscrypt_decrypt_page fscrypt_notsupp_decrypt_page 2334 #define fscrypt_decrypt_bio_pages fscrypt_notsupp_decrypt_bio_pages 2335 #define fscrypt_pullback_bio_page fscrypt_notsupp_pullback_bio_page 2336 #define fscrypt_restore_control_page fscrypt_notsupp_restore_control_page 2337 #define fscrypt_zeroout_range fscrypt_notsupp_zeroout_range 2338 #define fscrypt_process_policy fscrypt_notsupp_process_policy 2339 #define fscrypt_get_policy fscrypt_notsupp_get_policy 2340 #define fscrypt_has_permitted_context fscrypt_notsupp_has_permitted_context 2341 #define fscrypt_inherit_context fscrypt_notsupp_inherit_context 2342 #define fscrypt_get_encryption_info fscrypt_notsupp_get_encryption_info 2343 #define fscrypt_put_encryption_info fscrypt_notsupp_put_encryption_info 2344 #define fscrypt_setup_filename fscrypt_notsupp_setup_filename 2345 #define fscrypt_free_filename fscrypt_notsupp_free_filename 2346 #define fscrypt_fname_encrypted_size fscrypt_notsupp_fname_encrypted_size 2347 #define fscrypt_fname_alloc_buffer fscrypt_notsupp_fname_alloc_buffer 2348 #define fscrypt_fname_free_buffer fscrypt_notsupp_fname_free_buffer 2349 #define fscrypt_fname_disk_to_usr fscrypt_notsupp_fname_disk_to_usr 2350 #define fscrypt_fname_usr_to_disk fscrypt_notsupp_fname_usr_to_disk 2351 #endif 2352 2353 /* dir.c */ 2354 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2355 struct file *, 2356 struct ext4_dir_entry_2 *, 2357 struct buffer_head *, char *, int, 2358 unsigned int); 2359 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2360 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2361 (de), (bh), (buf), (size), (offset))) 2362 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2363 __u32 minor_hash, 2364 struct ext4_dir_entry_2 *dirent, 2365 struct fscrypt_str *ent_name); 2366 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2367 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2368 struct buffer_head *bh, 2369 void *buf, int buf_size, 2370 struct ext4_filename *fname, 2371 struct ext4_dir_entry_2 **dest_de); 2372 int ext4_insert_dentry(struct inode *dir, 2373 struct inode *inode, 2374 struct ext4_dir_entry_2 *de, 2375 int buf_size, 2376 struct ext4_filename *fname); 2377 static inline void ext4_update_dx_flag(struct inode *inode) 2378 { 2379 if (!ext4_has_feature_dir_index(inode->i_sb)) 2380 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2381 } 2382 static unsigned char ext4_filetype_table[] = { 2383 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2384 }; 2385 2386 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2387 { 2388 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2389 return DT_UNKNOWN; 2390 2391 return ext4_filetype_table[filetype]; 2392 } 2393 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2394 void *buf, int buf_size); 2395 2396 /* fsync.c */ 2397 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2398 2399 /* hash.c */ 2400 extern int ext4fs_dirhash(const char *name, int len, struct 2401 dx_hash_info *hinfo); 2402 2403 /* ialloc.c */ 2404 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2405 const struct qstr *qstr, __u32 goal, 2406 uid_t *owner, int handle_type, 2407 unsigned int line_no, int nblocks); 2408 2409 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \ 2410 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2411 0, 0, 0) 2412 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2413 type, nblocks) \ 2414 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2415 (type), __LINE__, (nblocks)) 2416 2417 2418 extern void ext4_free_inode(handle_t *, struct inode *); 2419 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2420 extern unsigned long ext4_count_free_inodes(struct super_block *); 2421 extern unsigned long ext4_count_dirs(struct super_block *); 2422 extern void ext4_check_inodes_bitmap(struct super_block *); 2423 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2424 extern int ext4_init_inode_table(struct super_block *sb, 2425 ext4_group_t group, int barrier); 2426 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2427 2428 /* mballoc.c */ 2429 extern const struct file_operations ext4_seq_mb_groups_fops; 2430 extern long ext4_mb_stats; 2431 extern long ext4_mb_max_to_scan; 2432 extern int ext4_mb_init(struct super_block *); 2433 extern int ext4_mb_release(struct super_block *); 2434 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2435 struct ext4_allocation_request *, int *); 2436 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2437 extern void ext4_discard_preallocations(struct inode *); 2438 extern int __init ext4_init_mballoc(void); 2439 extern void ext4_exit_mballoc(void); 2440 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2441 struct buffer_head *bh, ext4_fsblk_t block, 2442 unsigned long count, int flags); 2443 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2444 ext4_group_t ngroups); 2445 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2446 ext4_group_t i, struct ext4_group_desc *desc); 2447 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2448 ext4_fsblk_t block, unsigned long count); 2449 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2450 2451 /* inode.c */ 2452 int ext4_inode_is_fast_symlink(struct inode *inode); 2453 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2454 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2455 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2456 struct buffer_head *bh_result, int create); 2457 int ext4_dax_get_block(struct inode *inode, sector_t iblock, 2458 struct buffer_head *bh_result, int create); 2459 int ext4_get_block(struct inode *inode, sector_t iblock, 2460 struct buffer_head *bh_result, int create); 2461 int ext4_dio_get_block(struct inode *inode, sector_t iblock, 2462 struct buffer_head *bh_result, int create); 2463 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2464 struct buffer_head *bh, int create); 2465 int ext4_walk_page_buffers(handle_t *handle, 2466 struct buffer_head *head, 2467 unsigned from, 2468 unsigned to, 2469 int *partial, 2470 int (*fn)(handle_t *handle, 2471 struct buffer_head *bh)); 2472 int do_journal_get_write_access(handle_t *handle, 2473 struct buffer_head *bh); 2474 #define FALL_BACK_TO_NONDELALLOC 1 2475 #define CONVERT_INLINE_DATA 2 2476 2477 extern struct inode *ext4_iget(struct super_block *, unsigned long); 2478 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long); 2479 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2480 extern int ext4_setattr(struct dentry *, struct iattr *); 2481 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 2482 struct kstat *stat); 2483 extern void ext4_evict_inode(struct inode *); 2484 extern void ext4_clear_inode(struct inode *); 2485 extern int ext4_sync_inode(handle_t *, struct inode *); 2486 extern void ext4_dirty_inode(struct inode *, int); 2487 extern int ext4_change_inode_journal_flag(struct inode *, int); 2488 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2489 extern int ext4_inode_attach_jinode(struct inode *inode); 2490 extern int ext4_can_truncate(struct inode *inode); 2491 extern void ext4_truncate(struct inode *); 2492 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2493 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 2494 extern void ext4_set_inode_flags(struct inode *); 2495 extern void ext4_get_inode_flags(struct ext4_inode_info *); 2496 extern int ext4_alloc_da_blocks(struct inode *inode); 2497 extern void ext4_set_aops(struct inode *inode); 2498 extern int ext4_writepage_trans_blocks(struct inode *); 2499 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2500 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2501 loff_t lstart, loff_t lend); 2502 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 2503 extern int ext4_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf); 2504 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2505 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 2506 extern void ext4_da_update_reserve_space(struct inode *inode, 2507 int used, int quota_claim); 2508 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 2509 ext4_fsblk_t pblk, ext4_lblk_t len); 2510 extern int ext4_get_next_extent(struct inode *inode, ext4_lblk_t lblk, 2511 unsigned int map_len, 2512 struct extent_status *result); 2513 2514 /* indirect.c */ 2515 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2516 struct ext4_map_blocks *map, int flags); 2517 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2518 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2519 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2520 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2521 ext4_lblk_t start, ext4_lblk_t end); 2522 2523 /* ioctl.c */ 2524 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2525 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2526 2527 /* migrate.c */ 2528 extern int ext4_ext_migrate(struct inode *); 2529 extern int ext4_ind_migrate(struct inode *inode); 2530 2531 /* namei.c */ 2532 extern int ext4_dirent_csum_verify(struct inode *inode, 2533 struct ext4_dir_entry *dirent); 2534 extern int ext4_orphan_add(handle_t *, struct inode *); 2535 extern int ext4_orphan_del(handle_t *, struct inode *); 2536 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2537 __u32 start_minor_hash, __u32 *next_hash); 2538 extern int ext4_search_dir(struct buffer_head *bh, 2539 char *search_buf, 2540 int buf_size, 2541 struct inode *dir, 2542 struct ext4_filename *fname, 2543 const struct qstr *d_name, 2544 unsigned int offset, 2545 struct ext4_dir_entry_2 **res_dir); 2546 extern int ext4_generic_delete_entry(handle_t *handle, 2547 struct inode *dir, 2548 struct ext4_dir_entry_2 *de_del, 2549 struct buffer_head *bh, 2550 void *entry_buf, 2551 int buf_size, 2552 int csum_size); 2553 extern bool ext4_empty_dir(struct inode *inode); 2554 2555 /* resize.c */ 2556 extern int ext4_group_add(struct super_block *sb, 2557 struct ext4_new_group_data *input); 2558 extern int ext4_group_extend(struct super_block *sb, 2559 struct ext4_super_block *es, 2560 ext4_fsblk_t n_blocks_count); 2561 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2562 2563 /* super.c */ 2564 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 2565 extern int ext4_calculate_overhead(struct super_block *sb); 2566 extern void ext4_superblock_csum_set(struct super_block *sb); 2567 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 2568 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 2569 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2570 ext4_group_t ngroup); 2571 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2572 char nbuf[16]); 2573 2574 extern __printf(4, 5) 2575 void __ext4_error(struct super_block *, const char *, unsigned int, 2576 const char *, ...); 2577 extern __printf(5, 6) 2578 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2579 const char *, ...); 2580 extern __printf(5, 6) 2581 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2582 const char *, ...); 2583 extern void __ext4_std_error(struct super_block *, const char *, 2584 unsigned int, int); 2585 extern __printf(4, 5) 2586 void __ext4_abort(struct super_block *, const char *, unsigned int, 2587 const char *, ...); 2588 extern __printf(4, 5) 2589 void __ext4_warning(struct super_block *, const char *, unsigned int, 2590 const char *, ...); 2591 extern __printf(4, 5) 2592 void __ext4_warning_inode(const struct inode *inode, const char *function, 2593 unsigned int line, const char *fmt, ...); 2594 extern __printf(3, 4) 2595 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2596 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2597 const char *, unsigned int, const char *); 2598 extern __printf(7, 8) 2599 void __ext4_grp_locked_error(const char *, unsigned int, 2600 struct super_block *, ext4_group_t, 2601 unsigned long, ext4_fsblk_t, 2602 const char *, ...); 2603 2604 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 2605 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 2606 2607 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 2608 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 2609 2610 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 2611 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 2612 2613 #ifdef CONFIG_PRINTK 2614 2615 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2616 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__) 2617 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2618 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2619 #define ext4_error(sb, fmt, ...) \ 2620 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2621 #define ext4_abort(sb, fmt, ...) \ 2622 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2623 #define ext4_warning(sb, fmt, ...) \ 2624 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2625 #define ext4_warning_inode(inode, fmt, ...) \ 2626 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 2627 #define ext4_msg(sb, level, fmt, ...) \ 2628 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 2629 #define dump_mmp_msg(sb, mmp, msg) \ 2630 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 2631 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2632 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 2633 fmt, ##__VA_ARGS__) 2634 2635 #else 2636 2637 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2638 do { \ 2639 no_printk(fmt, ##__VA_ARGS__); \ 2640 __ext4_error_inode(inode, "", 0, block, " "); \ 2641 } while (0) 2642 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2643 do { \ 2644 no_printk(fmt, ##__VA_ARGS__); \ 2645 __ext4_error_file(file, "", 0, block, " "); \ 2646 } while (0) 2647 #define ext4_error(sb, fmt, ...) \ 2648 do { \ 2649 no_printk(fmt, ##__VA_ARGS__); \ 2650 __ext4_error(sb, "", 0, " "); \ 2651 } while (0) 2652 #define ext4_abort(sb, fmt, ...) \ 2653 do { \ 2654 no_printk(fmt, ##__VA_ARGS__); \ 2655 __ext4_abort(sb, "", 0, " "); \ 2656 } while (0) 2657 #define ext4_warning(sb, fmt, ...) \ 2658 do { \ 2659 no_printk(fmt, ##__VA_ARGS__); \ 2660 __ext4_warning(sb, "", 0, " "); \ 2661 } while (0) 2662 #define ext4_warning_inode(inode, fmt, ...) \ 2663 do { \ 2664 no_printk(fmt, ##__VA_ARGS__); \ 2665 __ext4_warning_inode(inode, "", 0, " "); \ 2666 } while (0) 2667 #define ext4_msg(sb, level, fmt, ...) \ 2668 do { \ 2669 no_printk(fmt, ##__VA_ARGS__); \ 2670 __ext4_msg(sb, "", " "); \ 2671 } while (0) 2672 #define dump_mmp_msg(sb, mmp, msg) \ 2673 __dump_mmp_msg(sb, mmp, "", 0, "") 2674 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2675 do { \ 2676 no_printk(fmt, ##__VA_ARGS__); \ 2677 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 2678 } while (0) 2679 2680 #endif 2681 2682 extern void ext4_update_dynamic_rev(struct super_block *sb); 2683 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2684 __u32 compat); 2685 extern int ext4_update_rocompat_feature(handle_t *handle, 2686 struct super_block *sb, __u32 rocompat); 2687 extern int ext4_update_incompat_feature(handle_t *handle, 2688 struct super_block *sb, __u32 incompat); 2689 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2690 struct ext4_group_desc *bg); 2691 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2692 struct ext4_group_desc *bg); 2693 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2694 struct ext4_group_desc *bg); 2695 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2696 struct ext4_group_desc *bg); 2697 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2698 struct ext4_group_desc *bg); 2699 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2700 struct ext4_group_desc *bg); 2701 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2702 struct ext4_group_desc *bg); 2703 extern void ext4_block_bitmap_set(struct super_block *sb, 2704 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2705 extern void ext4_inode_bitmap_set(struct super_block *sb, 2706 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2707 extern void ext4_inode_table_set(struct super_block *sb, 2708 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2709 extern void ext4_free_group_clusters_set(struct super_block *sb, 2710 struct ext4_group_desc *bg, 2711 __u32 count); 2712 extern void ext4_free_inodes_set(struct super_block *sb, 2713 struct ext4_group_desc *bg, __u32 count); 2714 extern void ext4_used_dirs_set(struct super_block *sb, 2715 struct ext4_group_desc *bg, __u32 count); 2716 extern void ext4_itable_unused_set(struct super_block *sb, 2717 struct ext4_group_desc *bg, __u32 count); 2718 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2719 struct ext4_group_desc *gdp); 2720 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2721 struct ext4_group_desc *gdp); 2722 extern int ext4_register_li_request(struct super_block *sb, 2723 ext4_group_t first_not_zeroed); 2724 2725 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2726 { 2727 return ext4_has_feature_gdt_csum(sb) || 2728 EXT4_SB(sb)->s_chksum_driver != NULL; 2729 } 2730 2731 static inline int ext4_has_metadata_csum(struct super_block *sb) 2732 { 2733 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 2734 !EXT4_SB(sb)->s_chksum_driver); 2735 2736 return (EXT4_SB(sb)->s_chksum_driver != NULL); 2737 } 2738 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2739 { 2740 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2741 le32_to_cpu(es->s_blocks_count_lo); 2742 } 2743 2744 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2745 { 2746 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2747 le32_to_cpu(es->s_r_blocks_count_lo); 2748 } 2749 2750 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2751 { 2752 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2753 le32_to_cpu(es->s_free_blocks_count_lo); 2754 } 2755 2756 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2757 ext4_fsblk_t blk) 2758 { 2759 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2760 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2761 } 2762 2763 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2764 ext4_fsblk_t blk) 2765 { 2766 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2767 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2768 } 2769 2770 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2771 ext4_fsblk_t blk) 2772 { 2773 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2774 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2775 } 2776 2777 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 2778 { 2779 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2780 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2781 le32_to_cpu(raw_inode->i_size_lo); 2782 else 2783 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2784 } 2785 2786 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2787 { 2788 raw_inode->i_size_lo = cpu_to_le32(i_size); 2789 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2790 } 2791 2792 static inline 2793 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2794 ext4_group_t group) 2795 { 2796 struct ext4_group_info ***grp_info; 2797 long indexv, indexh; 2798 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 2799 grp_info = EXT4_SB(sb)->s_group_info; 2800 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2801 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2802 return grp_info[indexv][indexh]; 2803 } 2804 2805 /* 2806 * Reading s_groups_count requires using smp_rmb() afterwards. See 2807 * the locking protocol documented in the comments of ext4_group_add() 2808 * in resize.c 2809 */ 2810 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2811 { 2812 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2813 2814 smp_rmb(); 2815 return ngroups; 2816 } 2817 2818 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2819 ext4_group_t block_group) 2820 { 2821 return block_group >> sbi->s_log_groups_per_flex; 2822 } 2823 2824 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2825 { 2826 return 1 << sbi->s_log_groups_per_flex; 2827 } 2828 2829 #define ext4_std_error(sb, errno) \ 2830 do { \ 2831 if ((errno)) \ 2832 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2833 } while (0) 2834 2835 #ifdef CONFIG_SMP 2836 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2837 * counters. So we need to make sure we have free clusters more 2838 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2839 */ 2840 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2841 #else 2842 #define EXT4_FREECLUSTERS_WATERMARK 0 2843 #endif 2844 2845 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 2846 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2847 { 2848 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 2849 !inode_is_locked(inode)); 2850 down_write(&EXT4_I(inode)->i_data_sem); 2851 if (newsize > EXT4_I(inode)->i_disksize) 2852 EXT4_I(inode)->i_disksize = newsize; 2853 up_write(&EXT4_I(inode)->i_data_sem); 2854 } 2855 2856 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 2857 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 2858 { 2859 int changed = 0; 2860 2861 if (newsize > inode->i_size) { 2862 i_size_write(inode, newsize); 2863 changed = 1; 2864 } 2865 if (newsize > EXT4_I(inode)->i_disksize) { 2866 ext4_update_i_disksize(inode, newsize); 2867 changed |= 2; 2868 } 2869 return changed; 2870 } 2871 2872 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 2873 loff_t len); 2874 2875 struct ext4_group_info { 2876 unsigned long bb_state; 2877 struct rb_root bb_free_root; 2878 ext4_grpblk_t bb_first_free; /* first free block */ 2879 ext4_grpblk_t bb_free; /* total free blocks */ 2880 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 2881 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 2882 struct list_head bb_prealloc_list; 2883 #ifdef DOUBLE_CHECK 2884 void *bb_bitmap; 2885 #endif 2886 struct rw_semaphore alloc_sem; 2887 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2888 * regions, index is order. 2889 * bb_counters[3] = 5 means 2890 * 5 free 8-block regions. */ 2891 }; 2892 2893 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 2894 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 2895 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 2896 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 2897 2898 #define EXT4_MB_GRP_NEED_INIT(grp) \ 2899 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 2900 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 2901 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2902 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 2903 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2904 2905 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 2906 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2907 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 2908 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2909 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 2910 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2911 2912 #define EXT4_MAX_CONTENTION 8 2913 #define EXT4_CONTENTION_THRESHOLD 2 2914 2915 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2916 ext4_group_t group) 2917 { 2918 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2919 } 2920 2921 /* 2922 * Returns true if the filesystem is busy enough that attempts to 2923 * access the block group locks has run into contention. 2924 */ 2925 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 2926 { 2927 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 2928 } 2929 2930 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 2931 { 2932 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 2933 if (spin_trylock(lock)) 2934 /* 2935 * We're able to grab the lock right away, so drop the 2936 * lock contention counter. 2937 */ 2938 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 2939 else { 2940 /* 2941 * The lock is busy, so bump the contention counter, 2942 * and then wait on the spin lock. 2943 */ 2944 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 2945 EXT4_MAX_CONTENTION); 2946 spin_lock(lock); 2947 } 2948 } 2949 2950 static inline void ext4_unlock_group(struct super_block *sb, 2951 ext4_group_t group) 2952 { 2953 spin_unlock(ext4_group_lock_ptr(sb, group)); 2954 } 2955 2956 /* 2957 * Block validity checking 2958 */ 2959 #define ext4_check_indirect_blockref(inode, bh) \ 2960 ext4_check_blockref(__func__, __LINE__, inode, \ 2961 (__le32 *)(bh)->b_data, \ 2962 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 2963 2964 #define ext4_ind_check_inode(inode) \ 2965 ext4_check_blockref(__func__, __LINE__, inode, \ 2966 EXT4_I(inode)->i_data, \ 2967 EXT4_NDIR_BLOCKS) 2968 2969 /* 2970 * Inodes and files operations 2971 */ 2972 2973 /* dir.c */ 2974 extern const struct file_operations ext4_dir_operations; 2975 2976 /* file.c */ 2977 extern const struct inode_operations ext4_file_inode_operations; 2978 extern const struct file_operations ext4_file_operations; 2979 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 2980 2981 /* inline.c */ 2982 extern int ext4_get_max_inline_size(struct inode *inode); 2983 extern int ext4_find_inline_data_nolock(struct inode *inode); 2984 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 2985 unsigned int len); 2986 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 2987 2988 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 2989 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 2990 struct inode *inode, 2991 loff_t pos, unsigned len, 2992 unsigned flags, 2993 struct page **pagep); 2994 extern int ext4_write_inline_data_end(struct inode *inode, 2995 loff_t pos, unsigned len, 2996 unsigned copied, 2997 struct page *page); 2998 extern struct buffer_head * 2999 ext4_journalled_write_inline_data(struct inode *inode, 3000 unsigned len, 3001 struct page *page); 3002 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 3003 struct inode *inode, 3004 loff_t pos, unsigned len, 3005 unsigned flags, 3006 struct page **pagep, 3007 void **fsdata); 3008 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 3009 unsigned len, unsigned copied, 3010 struct page *page); 3011 extern int ext4_try_add_inline_entry(handle_t *handle, 3012 struct ext4_filename *fname, 3013 struct inode *dir, struct inode *inode); 3014 extern int ext4_try_create_inline_dir(handle_t *handle, 3015 struct inode *parent, 3016 struct inode *inode); 3017 extern int ext4_read_inline_dir(struct file *filp, 3018 struct dir_context *ctx, 3019 int *has_inline_data); 3020 extern int htree_inlinedir_to_tree(struct file *dir_file, 3021 struct inode *dir, ext4_lblk_t block, 3022 struct dx_hash_info *hinfo, 3023 __u32 start_hash, __u32 start_minor_hash, 3024 int *has_inline_data); 3025 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3026 struct ext4_filename *fname, 3027 const struct qstr *d_name, 3028 struct ext4_dir_entry_2 **res_dir, 3029 int *has_inline_data); 3030 extern int ext4_delete_inline_entry(handle_t *handle, 3031 struct inode *dir, 3032 struct ext4_dir_entry_2 *de_del, 3033 struct buffer_head *bh, 3034 int *has_inline_data); 3035 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); 3036 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3037 struct ext4_dir_entry_2 **parent_de, 3038 int *retval); 3039 extern int ext4_inline_data_fiemap(struct inode *inode, 3040 struct fiemap_extent_info *fieinfo, 3041 int *has_inline, __u64 start, __u64 len); 3042 extern int ext4_try_to_evict_inline_data(handle_t *handle, 3043 struct inode *inode, 3044 int needed); 3045 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3046 3047 extern int ext4_convert_inline_data(struct inode *inode); 3048 3049 static inline int ext4_has_inline_data(struct inode *inode) 3050 { 3051 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3052 EXT4_I(inode)->i_inline_off; 3053 } 3054 3055 /* namei.c */ 3056 extern const struct inode_operations ext4_dir_inode_operations; 3057 extern const struct inode_operations ext4_special_inode_operations; 3058 extern struct dentry *ext4_get_parent(struct dentry *child); 3059 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3060 struct ext4_dir_entry_2 *de, 3061 int blocksize, int csum_size, 3062 unsigned int parent_ino, int dotdot_real_len); 3063 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t, 3064 unsigned int blocksize); 3065 extern int ext4_handle_dirty_dirent_node(handle_t *handle, 3066 struct inode *inode, 3067 struct buffer_head *bh); 3068 #define S_SHIFT 12 3069 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = { 3070 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3071 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3072 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3073 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3074 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3075 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3076 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3077 }; 3078 3079 static inline void ext4_set_de_type(struct super_block *sb, 3080 struct ext4_dir_entry_2 *de, 3081 umode_t mode) { 3082 if (ext4_has_feature_filetype(sb)) 3083 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3084 } 3085 3086 /* readpages.c */ 3087 extern int ext4_mpage_readpages(struct address_space *mapping, 3088 struct list_head *pages, struct page *page, 3089 unsigned nr_pages); 3090 3091 /* symlink.c */ 3092 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3093 extern const struct inode_operations ext4_symlink_inode_operations; 3094 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3095 3096 /* sysfs.c */ 3097 extern int ext4_register_sysfs(struct super_block *sb); 3098 extern void ext4_unregister_sysfs(struct super_block *sb); 3099 extern int __init ext4_init_sysfs(void); 3100 extern void ext4_exit_sysfs(void); 3101 3102 /* block_validity */ 3103 extern void ext4_release_system_zone(struct super_block *sb); 3104 extern int ext4_setup_system_zone(struct super_block *sb); 3105 extern int __init ext4_init_system_zone(void); 3106 extern void ext4_exit_system_zone(void); 3107 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 3108 ext4_fsblk_t start_blk, 3109 unsigned int count); 3110 extern int ext4_check_blockref(const char *, unsigned int, 3111 struct inode *, __le32 *, unsigned int); 3112 3113 /* extents.c */ 3114 struct ext4_ext_path; 3115 struct ext4_extent; 3116 3117 /* 3118 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3119 * __le32. 3120 */ 3121 #define EXT_MAX_BLOCKS 0xffffffff 3122 3123 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 3124 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 3125 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3126 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3127 struct ext4_map_blocks *map, int flags); 3128 extern void ext4_ext_truncate(handle_t *, struct inode *); 3129 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3130 ext4_lblk_t end); 3131 extern void ext4_ext_init(struct super_block *); 3132 extern void ext4_ext_release(struct super_block *); 3133 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3134 loff_t len); 3135 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3136 loff_t offset, ssize_t len); 3137 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3138 struct ext4_map_blocks *map, int flags); 3139 extern int ext4_ext_calc_metadata_amount(struct inode *inode, 3140 ext4_lblk_t lblocks); 3141 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3142 int num, 3143 struct ext4_ext_path *path); 3144 extern int ext4_can_extents_be_merged(struct inode *inode, 3145 struct ext4_extent *ex1, 3146 struct ext4_extent *ex2); 3147 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3148 struct ext4_ext_path **, 3149 struct ext4_extent *, int); 3150 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3151 struct ext4_ext_path **, 3152 int flags); 3153 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 3154 extern int ext4_ext_check_inode(struct inode *inode); 3155 extern int ext4_find_delalloc_range(struct inode *inode, 3156 ext4_lblk_t lblk_start, 3157 ext4_lblk_t lblk_end); 3158 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk); 3159 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3160 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3161 __u64 start, __u64 len); 3162 extern int ext4_ext_precache(struct inode *inode); 3163 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len); 3164 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len); 3165 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3166 struct inode *inode2, ext4_lblk_t lblk1, 3167 ext4_lblk_t lblk2, ext4_lblk_t count, 3168 int mark_unwritten,int *err); 3169 3170 /* move_extent.c */ 3171 extern void ext4_double_down_write_data_sem(struct inode *first, 3172 struct inode *second); 3173 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3174 struct inode *donor_inode); 3175 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3176 __u64 start_orig, __u64 start_donor, 3177 __u64 len, __u64 *moved_len); 3178 3179 /* page-io.c */ 3180 extern int __init ext4_init_pageio(void); 3181 extern void ext4_exit_pageio(void); 3182 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3183 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3184 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3185 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3186 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3187 struct writeback_control *wbc); 3188 extern void ext4_end_io_rsv_work(struct work_struct *work); 3189 extern void ext4_io_submit(struct ext4_io_submit *io); 3190 extern int ext4_bio_write_page(struct ext4_io_submit *io, 3191 struct page *page, 3192 int len, 3193 struct writeback_control *wbc, 3194 bool keep_towrite); 3195 3196 /* mmp.c */ 3197 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3198 3199 /* 3200 * Add new method to test whether block and inode bitmaps are properly 3201 * initialized. With uninit_bg reading the block from disk is not enough 3202 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3203 */ 3204 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3205 3206 static inline int bitmap_uptodate(struct buffer_head *bh) 3207 { 3208 return (buffer_uptodate(bh) && 3209 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3210 } 3211 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3212 { 3213 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3214 } 3215 3216 /* 3217 * Disable DIO read nolock optimization, so new dioreaders will be forced 3218 * to grab i_mutex 3219 */ 3220 static inline void ext4_inode_block_unlocked_dio(struct inode *inode) 3221 { 3222 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 3223 smp_mb(); 3224 } 3225 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode) 3226 { 3227 smp_mb(); 3228 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 3229 } 3230 3231 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3232 3233 /* For ioend & aio unwritten conversion wait queues */ 3234 #define EXT4_WQ_HASH_SZ 37 3235 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3236 EXT4_WQ_HASH_SZ]) 3237 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3238 3239 #define EXT4_RESIZING 0 3240 extern int ext4_resize_begin(struct super_block *sb); 3241 extern void ext4_resize_end(struct super_block *sb); 3242 3243 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 3244 struct ext4_io_end *io_end) 3245 { 3246 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 3247 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3248 atomic_inc(&EXT4_I(inode)->i_unwritten); 3249 } 3250 } 3251 3252 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3253 { 3254 struct inode *inode = io_end->inode; 3255 3256 if (io_end->flag & EXT4_IO_END_UNWRITTEN) { 3257 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3258 /* Wake up anyone waiting on unwritten extent conversion */ 3259 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) 3260 wake_up_all(ext4_ioend_wq(inode)); 3261 } 3262 } 3263 3264 static inline bool ext4_aligned_io(struct inode *inode, loff_t off, loff_t len) 3265 { 3266 int blksize = 1 << inode->i_blkbits; 3267 3268 return IS_ALIGNED(off, blksize) && IS_ALIGNED(len, blksize); 3269 } 3270 3271 #endif /* __KERNEL__ */ 3272 3273 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3274 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3275 3276 #endif /* _EXT4_H */ 3277