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 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \ 266 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \ 267 blkbits)) 268 269 /* Translate a block number to a cluster number */ 270 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 271 /* Translate a cluster number to a block number */ 272 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 273 /* Translate # of blks to # of clusters */ 274 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 275 (sbi)->s_cluster_bits) 276 /* Mask out the low bits to get the starting block of the cluster */ 277 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 278 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 279 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 280 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 281 /* Get the cluster offset */ 282 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 283 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 284 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 285 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 286 287 /* 288 * Structure of a blocks group descriptor 289 */ 290 struct ext4_group_desc 291 { 292 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 293 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 294 __le32 bg_inode_table_lo; /* Inodes table block */ 295 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 296 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 297 __le16 bg_used_dirs_count_lo; /* Directories count */ 298 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 299 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 300 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 301 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 302 __le16 bg_itable_unused_lo; /* Unused inodes count */ 303 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 304 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 305 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 306 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 307 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 308 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 309 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 310 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 311 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 312 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 313 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 314 __u32 bg_reserved; 315 }; 316 317 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 318 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 319 sizeof(__le16)) 320 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 321 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 322 sizeof(__le16)) 323 324 /* 325 * Structure of a flex block group info 326 */ 327 328 struct flex_groups { 329 atomic64_t free_clusters; 330 atomic_t free_inodes; 331 atomic_t used_dirs; 332 }; 333 334 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 335 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 336 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 337 338 /* 339 * Macro-instructions used to manage group descriptors 340 */ 341 #define EXT4_MIN_DESC_SIZE 32 342 #define EXT4_MIN_DESC_SIZE_64BIT 64 343 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 344 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 345 #ifdef __KERNEL__ 346 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 347 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 348 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 349 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 350 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 351 #else 352 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 353 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 354 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 355 #endif 356 357 /* 358 * Constants relative to the data blocks 359 */ 360 #define EXT4_NDIR_BLOCKS 12 361 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 362 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 363 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 364 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 365 366 /* 367 * Inode flags 368 */ 369 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 370 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 371 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 372 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 373 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 374 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 375 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 376 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 377 /* Reserved for compression usage... */ 378 #define EXT4_DIRTY_FL 0x00000100 379 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 380 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 381 /* nb: was previously EXT2_ECOMPR_FL */ 382 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 383 /* End compression flags --- maybe not all used */ 384 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 385 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 386 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 387 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 388 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 389 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 390 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 391 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 392 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 393 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 394 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 395 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 396 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 397 398 #define EXT4_FL_USER_VISIBLE 0x304BDFFF /* User visible flags */ 399 #define EXT4_FL_USER_MODIFIABLE 0x204380FF /* User modifiable flags */ 400 401 #define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \ 402 EXT4_IMMUTABLE_FL | \ 403 EXT4_APPEND_FL | \ 404 EXT4_NODUMP_FL | \ 405 EXT4_NOATIME_FL | \ 406 EXT4_PROJINHERIT_FL) 407 408 /* Flags that should be inherited by new inodes from their parent. */ 409 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 410 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 411 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 412 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 413 EXT4_PROJINHERIT_FL) 414 415 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 416 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 417 418 /* Flags that are appropriate for non-directories/regular files. */ 419 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 420 421 /* Mask out flags that are inappropriate for the given type of inode. */ 422 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 423 { 424 if (S_ISDIR(mode)) 425 return flags; 426 else if (S_ISREG(mode)) 427 return flags & EXT4_REG_FLMASK; 428 else 429 return flags & EXT4_OTHER_FLMASK; 430 } 431 432 /* 433 * Inode flags used for atomic set/get 434 */ 435 enum { 436 EXT4_INODE_SECRM = 0, /* Secure deletion */ 437 EXT4_INODE_UNRM = 1, /* Undelete */ 438 EXT4_INODE_COMPR = 2, /* Compress file */ 439 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 440 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 441 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 442 EXT4_INODE_NODUMP = 6, /* do not dump file */ 443 EXT4_INODE_NOATIME = 7, /* do not update atime */ 444 /* Reserved for compression usage... */ 445 EXT4_INODE_DIRTY = 8, 446 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 447 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 448 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 449 /* End compression flags --- maybe not all used */ 450 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 451 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 452 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 453 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 454 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 455 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 456 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 457 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 458 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 459 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 460 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 461 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 462 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 463 }; 464 465 /* 466 * Since it's pretty easy to mix up bit numbers and hex values, we use a 467 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 468 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 469 * any extra space in the compiled kernel image, otherwise, the build will fail. 470 * It's important that these values are the same, since we are using 471 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 472 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 473 * values found in ext2, ext3 and ext4 filesystems, and of course the values 474 * defined in e2fsprogs. 475 * 476 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 477 */ 478 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 479 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 480 481 static inline void ext4_check_flag_values(void) 482 { 483 CHECK_FLAG_VALUE(SECRM); 484 CHECK_FLAG_VALUE(UNRM); 485 CHECK_FLAG_VALUE(COMPR); 486 CHECK_FLAG_VALUE(SYNC); 487 CHECK_FLAG_VALUE(IMMUTABLE); 488 CHECK_FLAG_VALUE(APPEND); 489 CHECK_FLAG_VALUE(NODUMP); 490 CHECK_FLAG_VALUE(NOATIME); 491 CHECK_FLAG_VALUE(DIRTY); 492 CHECK_FLAG_VALUE(COMPRBLK); 493 CHECK_FLAG_VALUE(NOCOMPR); 494 CHECK_FLAG_VALUE(ENCRYPT); 495 CHECK_FLAG_VALUE(INDEX); 496 CHECK_FLAG_VALUE(IMAGIC); 497 CHECK_FLAG_VALUE(JOURNAL_DATA); 498 CHECK_FLAG_VALUE(NOTAIL); 499 CHECK_FLAG_VALUE(DIRSYNC); 500 CHECK_FLAG_VALUE(TOPDIR); 501 CHECK_FLAG_VALUE(HUGE_FILE); 502 CHECK_FLAG_VALUE(EXTENTS); 503 CHECK_FLAG_VALUE(EA_INODE); 504 CHECK_FLAG_VALUE(EOFBLOCKS); 505 CHECK_FLAG_VALUE(INLINE_DATA); 506 CHECK_FLAG_VALUE(PROJINHERIT); 507 CHECK_FLAG_VALUE(RESERVED); 508 } 509 510 /* Used to pass group descriptor data when online resize is done */ 511 struct ext4_new_group_input { 512 __u32 group; /* Group number for this data */ 513 __u64 block_bitmap; /* Absolute block number of block bitmap */ 514 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 515 __u64 inode_table; /* Absolute block number of inode table start */ 516 __u32 blocks_count; /* Total number of blocks in this group */ 517 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 518 __u16 unused; 519 }; 520 521 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 522 struct compat_ext4_new_group_input { 523 u32 group; 524 compat_u64 block_bitmap; 525 compat_u64 inode_bitmap; 526 compat_u64 inode_table; 527 u32 blocks_count; 528 u16 reserved_blocks; 529 u16 unused; 530 }; 531 #endif 532 533 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 534 struct ext4_new_group_data { 535 __u32 group; 536 __u64 block_bitmap; 537 __u64 inode_bitmap; 538 __u64 inode_table; 539 __u32 blocks_count; 540 __u16 reserved_blocks; 541 __u16 unused; 542 __u32 free_blocks_count; 543 }; 544 545 /* Indexes used to index group tables in ext4_new_group_data */ 546 enum { 547 BLOCK_BITMAP = 0, /* block bitmap */ 548 INODE_BITMAP, /* inode bitmap */ 549 INODE_TABLE, /* inode tables */ 550 GROUP_TABLE_COUNT, 551 }; 552 553 /* 554 * Flags used by ext4_map_blocks() 555 */ 556 /* Allocate any needed blocks and/or convert an unwritten 557 extent to be an initialized ext4 */ 558 #define EXT4_GET_BLOCKS_CREATE 0x0001 559 /* Request the creation of an unwritten extent */ 560 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 561 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 562 EXT4_GET_BLOCKS_CREATE) 563 /* Caller is from the delayed allocation writeout path 564 * finally doing the actual allocation of delayed blocks */ 565 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 566 /* caller is from the direct IO path, request to creation of an 567 unwritten extents if not allocated, split the unwritten 568 extent if blocks has been preallocated already*/ 569 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 570 #define EXT4_GET_BLOCKS_CONVERT 0x0010 571 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 572 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 573 /* Convert extent to initialized after IO complete */ 574 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 575 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 576 /* Eventual metadata allocation (due to growing extent tree) 577 * should not fail, so try to use reserved blocks for that.*/ 578 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 579 /* Don't normalize allocation size (used for fallocate) */ 580 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 581 /* Request will not result in inode size update (user for fallocate) */ 582 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 583 /* Convert written extents to unwritten */ 584 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 585 /* Write zeros to newly created written extents */ 586 #define EXT4_GET_BLOCKS_ZERO 0x0200 587 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 588 EXT4_GET_BLOCKS_ZERO) 589 /* Caller will submit data before dropping transaction handle. This 590 * allows jbd2 to avoid submitting data before commit. */ 591 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 592 593 /* 594 * The bit position of these flags must not overlap with any of the 595 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 596 * read_extent_tree_block(), ext4_split_extent_at(), 597 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 598 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 599 * caching the extents when reading from the extent tree while a 600 * truncate or punch hole operation is in progress. 601 */ 602 #define EXT4_EX_NOCACHE 0x40000000 603 #define EXT4_EX_FORCE_CACHE 0x20000000 604 605 /* 606 * Flags used by ext4_free_blocks 607 */ 608 #define EXT4_FREE_BLOCKS_METADATA 0x0001 609 #define EXT4_FREE_BLOCKS_FORGET 0x0002 610 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 611 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 612 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 613 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 614 615 /* 616 * ioctl commands 617 */ 618 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 619 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 620 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 621 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 622 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 623 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 624 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 625 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 626 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 627 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 628 #define EXT4_IOC_MIGRATE _IO('f', 9) 629 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 630 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 631 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 632 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 633 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 634 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 635 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 636 #define EXT4_IOC_SET_ENCRYPTION_POLICY FS_IOC_SET_ENCRYPTION_POLICY 637 #define EXT4_IOC_GET_ENCRYPTION_PWSALT FS_IOC_GET_ENCRYPTION_PWSALT 638 #define EXT4_IOC_GET_ENCRYPTION_POLICY FS_IOC_GET_ENCRYPTION_POLICY 639 640 #ifndef FS_IOC_FSGETXATTR 641 /* Until the uapi changes get merged for project quota... */ 642 643 #define FS_IOC_FSGETXATTR _IOR('X', 31, struct fsxattr) 644 #define FS_IOC_FSSETXATTR _IOW('X', 32, struct fsxattr) 645 646 /* 647 * Structure for FS_IOC_FSGETXATTR and FS_IOC_FSSETXATTR. 648 */ 649 struct fsxattr { 650 __u32 fsx_xflags; /* xflags field value (get/set) */ 651 __u32 fsx_extsize; /* extsize field value (get/set)*/ 652 __u32 fsx_nextents; /* nextents field value (get) */ 653 __u32 fsx_projid; /* project identifier (get/set) */ 654 unsigned char fsx_pad[12]; 655 }; 656 657 /* 658 * Flags for the fsx_xflags field 659 */ 660 #define FS_XFLAG_REALTIME 0x00000001 /* data in realtime volume */ 661 #define FS_XFLAG_PREALLOC 0x00000002 /* preallocated file extents */ 662 #define FS_XFLAG_IMMUTABLE 0x00000008 /* file cannot be modified */ 663 #define FS_XFLAG_APPEND 0x00000010 /* all writes append */ 664 #define FS_XFLAG_SYNC 0x00000020 /* all writes synchronous */ 665 #define FS_XFLAG_NOATIME 0x00000040 /* do not update access time */ 666 #define FS_XFLAG_NODUMP 0x00000080 /* do not include in backups */ 667 #define FS_XFLAG_RTINHERIT 0x00000100 /* create with rt bit set */ 668 #define FS_XFLAG_PROJINHERIT 0x00000200 /* create with parents projid */ 669 #define FS_XFLAG_NOSYMLINKS 0x00000400 /* disallow symlink creation */ 670 #define FS_XFLAG_EXTSIZE 0x00000800 /* extent size allocator hint */ 671 #define FS_XFLAG_EXTSZINHERIT 0x00001000 /* inherit inode extent size */ 672 #define FS_XFLAG_NODEFRAG 0x00002000 /* do not defragment */ 673 #define FS_XFLAG_FILESTREAM 0x00004000 /* use filestream allocator */ 674 #define FS_XFLAG_HASATTR 0x80000000 /* no DIFLAG for this */ 675 #endif /* !defined(FS_IOC_FSGETXATTR) */ 676 677 #define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR 678 #define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR 679 680 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 681 /* 682 * ioctl commands in 32 bit emulation 683 */ 684 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 685 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 686 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 687 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 688 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 689 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 690 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 691 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 692 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 693 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 694 #endif 695 696 /* Max physical block we can address w/o extents */ 697 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 698 699 /* 700 * Structure of an inode on the disk 701 */ 702 struct ext4_inode { 703 __le16 i_mode; /* File mode */ 704 __le16 i_uid; /* Low 16 bits of Owner Uid */ 705 __le32 i_size_lo; /* Size in bytes */ 706 __le32 i_atime; /* Access time */ 707 __le32 i_ctime; /* Inode Change time */ 708 __le32 i_mtime; /* Modification time */ 709 __le32 i_dtime; /* Deletion Time */ 710 __le16 i_gid; /* Low 16 bits of Group Id */ 711 __le16 i_links_count; /* Links count */ 712 __le32 i_blocks_lo; /* Blocks count */ 713 __le32 i_flags; /* File flags */ 714 union { 715 struct { 716 __le32 l_i_version; 717 } linux1; 718 struct { 719 __u32 h_i_translator; 720 } hurd1; 721 struct { 722 __u32 m_i_reserved1; 723 } masix1; 724 } osd1; /* OS dependent 1 */ 725 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 726 __le32 i_generation; /* File version (for NFS) */ 727 __le32 i_file_acl_lo; /* File ACL */ 728 __le32 i_size_high; 729 __le32 i_obso_faddr; /* Obsoleted fragment address */ 730 union { 731 struct { 732 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 733 __le16 l_i_file_acl_high; 734 __le16 l_i_uid_high; /* these 2 fields */ 735 __le16 l_i_gid_high; /* were reserved2[0] */ 736 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 737 __le16 l_i_reserved; 738 } linux2; 739 struct { 740 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 741 __u16 h_i_mode_high; 742 __u16 h_i_uid_high; 743 __u16 h_i_gid_high; 744 __u32 h_i_author; 745 } hurd2; 746 struct { 747 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 748 __le16 m_i_file_acl_high; 749 __u32 m_i_reserved2[2]; 750 } masix2; 751 } osd2; /* OS dependent 2 */ 752 __le16 i_extra_isize; 753 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 754 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 755 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 756 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 757 __le32 i_crtime; /* File Creation time */ 758 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 759 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 760 __le32 i_projid; /* Project ID */ 761 }; 762 763 struct move_extent { 764 __u32 reserved; /* should be zero */ 765 __u32 donor_fd; /* donor file descriptor */ 766 __u64 orig_start; /* logical start offset in block for orig */ 767 __u64 donor_start; /* logical start offset in block for donor */ 768 __u64 len; /* block length to be moved */ 769 __u64 moved_len; /* moved block length */ 770 }; 771 772 #define EXT4_EPOCH_BITS 2 773 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 774 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 775 776 /* 777 * Extended fields will fit into an inode if the filesystem was formatted 778 * with large inodes (-I 256 or larger) and there are not currently any EAs 779 * consuming all of the available space. For new inodes we always reserve 780 * enough space for the kernel's known extended fields, but for inodes 781 * created with an old kernel this might not have been the case. None of 782 * the extended inode fields is critical for correct filesystem operation. 783 * This macro checks if a certain field fits in the inode. Note that 784 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 785 */ 786 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 787 ((offsetof(typeof(*ext4_inode), field) + \ 788 sizeof((ext4_inode)->field)) \ 789 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 790 (einode)->i_extra_isize)) \ 791 792 /* 793 * We use an encoding that preserves the times for extra epoch "00": 794 * 795 * extra msb of adjust for signed 796 * epoch 32-bit 32-bit tv_sec to 797 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 798 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 799 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 800 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 801 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 802 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 803 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 804 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 805 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 806 * 807 * Note that previous versions of the kernel on 64-bit systems would 808 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 809 * 1970. e2fsck will correct this, assuming that it is run on the 810 * affected filesystem before 2242. 811 */ 812 813 static inline __le32 ext4_encode_extra_time(struct timespec *time) 814 { 815 u32 extra = sizeof(time->tv_sec) > 4 ? 816 ((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK : 0; 817 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); 818 } 819 820 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 821 { 822 if (unlikely(sizeof(time->tv_sec) > 4 && 823 (extra & cpu_to_le32(EXT4_EPOCH_MASK)))) { 824 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,20,0) 825 /* Handle legacy encoding of pre-1970 dates with epoch 826 * bits 1,1. We assume that by kernel version 4.20, 827 * everyone will have run fsck over the affected 828 * filesystems to correct the problem. (This 829 * backwards compatibility may be removed before this 830 * time, at the discretion of the ext4 developers.) 831 */ 832 u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK; 833 if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0) 834 extra_bits = 0; 835 time->tv_sec += extra_bits << 32; 836 #else 837 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 838 #endif 839 } 840 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 841 } 842 843 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 844 do { \ 845 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 846 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 847 (raw_inode)->xtime ## _extra = \ 848 ext4_encode_extra_time(&(inode)->xtime); \ 849 } while (0) 850 851 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 852 do { \ 853 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 854 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 855 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 856 (raw_inode)->xtime ## _extra = \ 857 ext4_encode_extra_time(&(einode)->xtime); \ 858 } while (0) 859 860 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 861 do { \ 862 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 863 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 864 ext4_decode_extra_time(&(inode)->xtime, \ 865 raw_inode->xtime ## _extra); \ 866 else \ 867 (inode)->xtime.tv_nsec = 0; \ 868 } while (0) 869 870 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 871 do { \ 872 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 873 (einode)->xtime.tv_sec = \ 874 (signed)le32_to_cpu((raw_inode)->xtime); \ 875 else \ 876 (einode)->xtime.tv_sec = 0; \ 877 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 878 ext4_decode_extra_time(&(einode)->xtime, \ 879 raw_inode->xtime ## _extra); \ 880 else \ 881 (einode)->xtime.tv_nsec = 0; \ 882 } while (0) 883 884 #define i_disk_version osd1.linux1.l_i_version 885 886 #if defined(__KERNEL__) || defined(__linux__) 887 #define i_reserved1 osd1.linux1.l_i_reserved1 888 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 889 #define i_blocks_high osd2.linux2.l_i_blocks_high 890 #define i_uid_low i_uid 891 #define i_gid_low i_gid 892 #define i_uid_high osd2.linux2.l_i_uid_high 893 #define i_gid_high osd2.linux2.l_i_gid_high 894 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 895 896 #elif defined(__GNU__) 897 898 #define i_translator osd1.hurd1.h_i_translator 899 #define i_uid_high osd2.hurd2.h_i_uid_high 900 #define i_gid_high osd2.hurd2.h_i_gid_high 901 #define i_author osd2.hurd2.h_i_author 902 903 #elif defined(__masix__) 904 905 #define i_reserved1 osd1.masix1.m_i_reserved1 906 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 907 #define i_reserved2 osd2.masix2.m_i_reserved2 908 909 #endif /* defined(__KERNEL__) || defined(__linux__) */ 910 911 #include "extents_status.h" 912 913 /* 914 * Lock subclasses for i_data_sem in the ext4_inode_info structure. 915 * 916 * These are needed to avoid lockdep false positives when we need to 917 * allocate blocks to the quota inode during ext4_map_blocks(), while 918 * holding i_data_sem for a normal (non-quota) inode. Since we don't 919 * do quota tracking for the quota inode, this avoids deadlock (as 920 * well as infinite recursion, since it isn't turtles all the way 921 * down...) 922 * 923 * I_DATA_SEM_NORMAL - Used for most inodes 924 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode 925 * where the second inode has larger inode number 926 * than the first 927 * I_DATA_SEM_QUOTA - Used for quota inodes only 928 */ 929 enum { 930 I_DATA_SEM_NORMAL = 0, 931 I_DATA_SEM_OTHER, 932 I_DATA_SEM_QUOTA, 933 }; 934 935 936 /* 937 * fourth extended file system inode data in memory 938 */ 939 struct ext4_inode_info { 940 __le32 i_data[15]; /* unconverted */ 941 __u32 i_dtime; 942 ext4_fsblk_t i_file_acl; 943 944 /* 945 * i_block_group is the number of the block group which contains 946 * this file's inode. Constant across the lifetime of the inode, 947 * it is ued for making block allocation decisions - we try to 948 * place a file's data blocks near its inode block, and new inodes 949 * near to their parent directory's inode. 950 */ 951 ext4_group_t i_block_group; 952 ext4_lblk_t i_dir_start_lookup; 953 #if (BITS_PER_LONG < 64) 954 unsigned long i_state_flags; /* Dynamic state flags */ 955 #endif 956 unsigned long i_flags; 957 958 /* 959 * Extended attributes can be read independently of the main file 960 * data. Taking i_mutex even when reading would cause contention 961 * between readers of EAs and writers of regular file data, so 962 * instead we synchronize on xattr_sem when reading or changing 963 * EAs. 964 */ 965 struct rw_semaphore xattr_sem; 966 967 struct list_head i_orphan; /* unlinked but open inodes */ 968 969 /* 970 * i_disksize keeps track of what the inode size is ON DISK, not 971 * in memory. During truncate, i_size is set to the new size by 972 * the VFS prior to calling ext4_truncate(), but the filesystem won't 973 * set i_disksize to 0 until the truncate is actually under way. 974 * 975 * The intent is that i_disksize always represents the blocks which 976 * are used by this file. This allows recovery to restart truncate 977 * on orphans if we crash during truncate. We actually write i_disksize 978 * into the on-disk inode when writing inodes out, instead of i_size. 979 * 980 * The only time when i_disksize and i_size may be different is when 981 * a truncate is in progress. The only things which change i_disksize 982 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 983 */ 984 loff_t i_disksize; 985 986 /* 987 * i_data_sem is for serialising ext4_truncate() against 988 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 989 * data tree are chopped off during truncate. We can't do that in 990 * ext4 because whenever we perform intermediate commits during 991 * truncate, the inode and all the metadata blocks *must* be in a 992 * consistent state which allows truncation of the orphans to restart 993 * during recovery. Hence we must fix the get_block-vs-truncate race 994 * by other means, so we have i_data_sem. 995 */ 996 struct rw_semaphore i_data_sem; 997 /* 998 * i_mmap_sem is for serializing page faults with truncate / punch hole 999 * operations. We have to make sure that new page cannot be faulted in 1000 * a section of the inode that is being punched. We cannot easily use 1001 * i_data_sem for this since we need protection for the whole punch 1002 * operation and i_data_sem ranks below transaction start so we have 1003 * to occasionally drop it. 1004 */ 1005 struct rw_semaphore i_mmap_sem; 1006 struct inode vfs_inode; 1007 struct jbd2_inode *jinode; 1008 1009 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 1010 1011 /* 1012 * File creation time. Its function is same as that of 1013 * struct timespec i_{a,c,m}time in the generic inode. 1014 */ 1015 struct timespec i_crtime; 1016 1017 /* mballoc */ 1018 struct list_head i_prealloc_list; 1019 spinlock_t i_prealloc_lock; 1020 1021 /* extents status tree */ 1022 struct ext4_es_tree i_es_tree; 1023 rwlock_t i_es_lock; 1024 struct list_head i_es_list; 1025 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1026 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1027 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1028 extents to shrink. Protected by 1029 i_es_lock */ 1030 1031 /* ialloc */ 1032 ext4_group_t i_last_alloc_group; 1033 1034 /* allocation reservation info for delalloc */ 1035 /* In case of bigalloc, these refer to clusters rather than blocks */ 1036 unsigned int i_reserved_data_blocks; 1037 unsigned int i_reserved_meta_blocks; 1038 unsigned int i_allocated_meta_blocks; 1039 ext4_lblk_t i_da_metadata_calc_last_lblock; 1040 int i_da_metadata_calc_len; 1041 1042 /* on-disk additional length */ 1043 __u16 i_extra_isize; 1044 1045 /* Indicate the inline data space. */ 1046 u16 i_inline_off; 1047 u16 i_inline_size; 1048 1049 #ifdef CONFIG_QUOTA 1050 /* quota space reservation, managed internally by quota code */ 1051 qsize_t i_reserved_quota; 1052 #endif 1053 1054 /* Lock protecting lists below */ 1055 spinlock_t i_completed_io_lock; 1056 /* 1057 * Completed IOs that need unwritten extents handling and have 1058 * transaction reserved 1059 */ 1060 struct list_head i_rsv_conversion_list; 1061 struct work_struct i_rsv_conversion_work; 1062 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 1063 1064 spinlock_t i_block_reservation_lock; 1065 1066 /* 1067 * Transactions that contain inode's metadata needed to complete 1068 * fsync and fdatasync, respectively. 1069 */ 1070 tid_t i_sync_tid; 1071 tid_t i_datasync_tid; 1072 1073 #ifdef CONFIG_QUOTA 1074 struct dquot *i_dquot[MAXQUOTAS]; 1075 #endif 1076 1077 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1078 __u32 i_csum_seed; 1079 1080 kprojid_t i_projid; 1081 }; 1082 1083 /* 1084 * File system states 1085 */ 1086 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1087 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1088 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1089 1090 /* 1091 * Misc. filesystem flags 1092 */ 1093 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1094 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1095 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1096 1097 /* 1098 * Mount flags set via mount options or defaults 1099 */ 1100 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1101 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1102 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1103 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1104 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1105 #define EXT4_MOUNT_ERRORS_MASK 0x00070 1106 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1107 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1108 #ifdef CONFIG_FS_DAX 1109 #define EXT4_MOUNT_DAX 0x00200 /* Direct Access */ 1110 #else 1111 #define EXT4_MOUNT_DAX 0 1112 #endif 1113 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1114 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1115 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1116 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1117 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1118 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1119 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1120 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1121 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1122 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1123 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */ 1124 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota, 1125 * enable enforcement for hidden 1126 * quota files */ 1127 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable 1128 * enforcement for hidden quota 1129 * files */ 1130 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota 1131 * enforcement */ 1132 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1133 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1134 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1135 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1136 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1137 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1138 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1139 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1140 1141 /* 1142 * Mount flags set either automatically (could not be set by mount option) 1143 * based on per file system feature or property or in special cases such as 1144 * distinguishing between explicit mount option definition and default. 1145 */ 1146 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1147 specified delalloc */ 1148 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1149 size of blocksize * 8 1150 blocks */ 1151 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1152 file systems */ 1153 1154 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1155 specified journal checksum */ 1156 1157 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1158 ~EXT4_MOUNT_##opt 1159 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1160 EXT4_MOUNT_##opt 1161 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1162 EXT4_MOUNT_##opt) 1163 1164 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1165 ~EXT4_MOUNT2_##opt 1166 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1167 EXT4_MOUNT2_##opt 1168 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1169 EXT4_MOUNT2_##opt) 1170 1171 #define ext4_test_and_set_bit __test_and_set_bit_le 1172 #define ext4_set_bit __set_bit_le 1173 #define ext4_set_bit_atomic ext2_set_bit_atomic 1174 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1175 #define ext4_clear_bit __clear_bit_le 1176 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1177 #define ext4_test_bit test_bit_le 1178 #define ext4_find_next_zero_bit find_next_zero_bit_le 1179 #define ext4_find_next_bit find_next_bit_le 1180 1181 extern void ext4_set_bits(void *bm, int cur, int len); 1182 1183 /* 1184 * Maximal mount counts between two filesystem checks 1185 */ 1186 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1187 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1188 1189 /* 1190 * Behaviour when detecting errors 1191 */ 1192 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1193 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1194 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1195 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1196 1197 /* Metadata checksum algorithm codes */ 1198 #define EXT4_CRC32C_CHKSUM 1 1199 1200 /* 1201 * Structure of the super block 1202 */ 1203 struct ext4_super_block { 1204 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1205 __le32 s_blocks_count_lo; /* Blocks count */ 1206 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1207 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1208 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1209 __le32 s_first_data_block; /* First Data Block */ 1210 __le32 s_log_block_size; /* Block size */ 1211 __le32 s_log_cluster_size; /* Allocation cluster size */ 1212 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1213 __le32 s_clusters_per_group; /* # Clusters per group */ 1214 __le32 s_inodes_per_group; /* # Inodes per group */ 1215 __le32 s_mtime; /* Mount time */ 1216 /*30*/ __le32 s_wtime; /* Write time */ 1217 __le16 s_mnt_count; /* Mount count */ 1218 __le16 s_max_mnt_count; /* Maximal mount count */ 1219 __le16 s_magic; /* Magic signature */ 1220 __le16 s_state; /* File system state */ 1221 __le16 s_errors; /* Behaviour when detecting errors */ 1222 __le16 s_minor_rev_level; /* minor revision level */ 1223 /*40*/ __le32 s_lastcheck; /* time of last check */ 1224 __le32 s_checkinterval; /* max. time between checks */ 1225 __le32 s_creator_os; /* OS */ 1226 __le32 s_rev_level; /* Revision level */ 1227 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1228 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1229 /* 1230 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1231 * 1232 * Note: the difference between the compatible feature set and 1233 * the incompatible feature set is that if there is a bit set 1234 * in the incompatible feature set that the kernel doesn't 1235 * know about, it should refuse to mount the filesystem. 1236 * 1237 * e2fsck's requirements are more strict; if it doesn't know 1238 * about a feature in either the compatible or incompatible 1239 * feature set, it must abort and not try to meddle with 1240 * things it doesn't understand... 1241 */ 1242 __le32 s_first_ino; /* First non-reserved inode */ 1243 __le16 s_inode_size; /* size of inode structure */ 1244 __le16 s_block_group_nr; /* block group # of this superblock */ 1245 __le32 s_feature_compat; /* compatible feature set */ 1246 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1247 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1248 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1249 /*78*/ char s_volume_name[16]; /* volume name */ 1250 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 1251 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1252 /* 1253 * Performance hints. Directory preallocation should only 1254 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1255 */ 1256 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1257 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1258 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1259 /* 1260 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1261 */ 1262 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1263 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1264 __le32 s_journal_dev; /* device number of journal file */ 1265 __le32 s_last_orphan; /* start of list of inodes to delete */ 1266 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1267 __u8 s_def_hash_version; /* Default hash version to use */ 1268 __u8 s_jnl_backup_type; 1269 __le16 s_desc_size; /* size of group descriptor */ 1270 /*100*/ __le32 s_default_mount_opts; 1271 __le32 s_first_meta_bg; /* First metablock block group */ 1272 __le32 s_mkfs_time; /* When the filesystem was created */ 1273 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1274 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1275 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1276 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1277 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1278 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1279 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1280 __le32 s_flags; /* Miscellaneous flags */ 1281 __le16 s_raid_stride; /* RAID stride */ 1282 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1283 __le64 s_mmp_block; /* Block for multi-mount protection */ 1284 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1285 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1286 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1287 __u8 s_encryption_level; /* versioning level for encryption */ 1288 __u8 s_reserved_pad; /* Padding to next 32bits */ 1289 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1290 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1291 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1292 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1293 snapshot's future use */ 1294 __le32 s_snapshot_list; /* inode number of the head of the 1295 on-disk snapshot list */ 1296 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1297 __le32 s_error_count; /* number of fs errors */ 1298 __le32 s_first_error_time; /* first time an error happened */ 1299 __le32 s_first_error_ino; /* inode involved in first error */ 1300 __le64 s_first_error_block; /* block involved of first error */ 1301 __u8 s_first_error_func[32]; /* function where the error happened */ 1302 __le32 s_first_error_line; /* line number where error happened */ 1303 __le32 s_last_error_time; /* most recent time of an error */ 1304 __le32 s_last_error_ino; /* inode involved in last error */ 1305 __le32 s_last_error_line; /* line number where error happened */ 1306 __le64 s_last_error_block; /* block involved of last error */ 1307 __u8 s_last_error_func[32]; /* function where the error happened */ 1308 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1309 __u8 s_mount_opts[64]; 1310 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1311 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1312 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1313 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1314 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1315 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1316 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1317 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1318 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1319 __le32 s_reserved[98]; /* Padding to the end of the block */ 1320 __le32 s_checksum; /* crc32c(superblock) */ 1321 }; 1322 1323 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1324 1325 #ifdef __KERNEL__ 1326 1327 /* 1328 * run-time mount flags 1329 */ 1330 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1331 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1332 #define EXT4_MF_TEST_DUMMY_ENCRYPTION 0x0004 1333 1334 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1335 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \ 1336 EXT4_MF_TEST_DUMMY_ENCRYPTION)) 1337 #else 1338 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0) 1339 #endif 1340 1341 /* Number of quota types we support */ 1342 #define EXT4_MAXQUOTAS 3 1343 1344 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1345 #define EXT4_KEY_DESC_PREFIX "ext4:" 1346 #define EXT4_KEY_DESC_PREFIX_SIZE 5 1347 #endif 1348 1349 /* 1350 * fourth extended-fs super-block data in memory 1351 */ 1352 struct ext4_sb_info { 1353 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1354 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1355 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1356 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1357 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1358 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1359 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1360 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1361 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1362 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1363 unsigned long s_overhead; /* # of fs overhead clusters */ 1364 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1365 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1366 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1367 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1368 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1369 struct buffer_head **s_group_desc; 1370 unsigned int s_mount_opt; 1371 unsigned int s_mount_opt2; 1372 unsigned int s_mount_flags; 1373 unsigned int s_def_mount_opt; 1374 ext4_fsblk_t s_sb_block; 1375 atomic64_t s_resv_clusters; 1376 kuid_t s_resuid; 1377 kgid_t s_resgid; 1378 unsigned short s_mount_state; 1379 unsigned short s_pad; 1380 int s_addr_per_block_bits; 1381 int s_desc_per_block_bits; 1382 int s_inode_size; 1383 int s_first_ino; 1384 unsigned int s_inode_readahead_blks; 1385 unsigned int s_inode_goal; 1386 spinlock_t s_next_gen_lock; 1387 u32 s_next_generation; 1388 u32 s_hash_seed[4]; 1389 int s_def_hash_version; 1390 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1391 struct percpu_counter s_freeclusters_counter; 1392 struct percpu_counter s_freeinodes_counter; 1393 struct percpu_counter s_dirs_counter; 1394 struct percpu_counter s_dirtyclusters_counter; 1395 struct blockgroup_lock *s_blockgroup_lock; 1396 struct proc_dir_entry *s_proc; 1397 struct kobject s_kobj; 1398 struct completion s_kobj_unregister; 1399 struct super_block *s_sb; 1400 1401 /* Journaling */ 1402 struct journal_s *s_journal; 1403 struct list_head s_orphan; 1404 struct mutex s_orphan_lock; 1405 unsigned long s_resize_flags; /* Flags indicating if there 1406 is a resizer */ 1407 unsigned long s_commit_interval; 1408 u32 s_max_batch_time; 1409 u32 s_min_batch_time; 1410 struct block_device *journal_bdev; 1411 #ifdef CONFIG_QUOTA 1412 char *s_qf_names[EXT4_MAXQUOTAS]; /* Names of quota files with journalled quota */ 1413 int s_jquota_fmt; /* Format of quota to use */ 1414 #endif 1415 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1416 struct rb_root system_blks; 1417 1418 #ifdef EXTENTS_STATS 1419 /* ext4 extents stats */ 1420 unsigned long s_ext_min; 1421 unsigned long s_ext_max; 1422 unsigned long s_depth_max; 1423 spinlock_t s_ext_stats_lock; 1424 unsigned long s_ext_blocks; 1425 unsigned long s_ext_extents; 1426 #endif 1427 1428 /* for buddy allocator */ 1429 struct ext4_group_info ***s_group_info; 1430 struct inode *s_buddy_cache; 1431 spinlock_t s_md_lock; 1432 unsigned short *s_mb_offsets; 1433 unsigned int *s_mb_maxs; 1434 unsigned int s_group_info_size; 1435 unsigned int s_mb_free_pending; 1436 1437 /* tunables */ 1438 unsigned long s_stripe; 1439 unsigned int s_mb_stream_request; 1440 unsigned int s_mb_max_to_scan; 1441 unsigned int s_mb_min_to_scan; 1442 unsigned int s_mb_stats; 1443 unsigned int s_mb_order2_reqs; 1444 unsigned int s_mb_group_prealloc; 1445 unsigned int s_max_dir_size_kb; 1446 /* where last allocation was done - for stream allocation */ 1447 unsigned long s_mb_last_group; 1448 unsigned long s_mb_last_start; 1449 1450 /* stats for buddy allocator */ 1451 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1452 atomic_t s_bal_success; /* we found long enough chunks */ 1453 atomic_t s_bal_allocated; /* in blocks */ 1454 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1455 atomic_t s_bal_goals; /* goal hits */ 1456 atomic_t s_bal_breaks; /* too long searches */ 1457 atomic_t s_bal_2orders; /* 2^order hits */ 1458 spinlock_t s_bal_lock; 1459 unsigned long s_mb_buddies_generated; 1460 unsigned long long s_mb_generation_time; 1461 atomic_t s_mb_lost_chunks; 1462 atomic_t s_mb_preallocated; 1463 atomic_t s_mb_discarded; 1464 atomic_t s_lock_busy; 1465 1466 /* locality groups */ 1467 struct ext4_locality_group __percpu *s_locality_groups; 1468 1469 /* for write statistics */ 1470 unsigned long s_sectors_written_start; 1471 u64 s_kbytes_written; 1472 1473 /* the size of zero-out chunk */ 1474 unsigned int s_extent_max_zeroout_kb; 1475 1476 unsigned int s_log_groups_per_flex; 1477 struct flex_groups *s_flex_groups; 1478 ext4_group_t s_flex_groups_allocated; 1479 1480 /* workqueue for reserved extent conversions (buffered io) */ 1481 struct workqueue_struct *rsv_conversion_wq; 1482 1483 /* timer for periodic error stats printing */ 1484 struct timer_list s_err_report; 1485 1486 /* Lazy inode table initialization info */ 1487 struct ext4_li_request *s_li_request; 1488 /* Wait multiplier for lazy initialization thread */ 1489 unsigned int s_li_wait_mult; 1490 1491 /* Kernel thread for multiple mount protection */ 1492 struct task_struct *s_mmp_tsk; 1493 1494 /* record the last minlen when FITRIM is called. */ 1495 atomic_t s_last_trim_minblks; 1496 1497 /* Reference to checksum algorithm driver via cryptoapi */ 1498 struct crypto_shash *s_chksum_driver; 1499 1500 /* Precomputed FS UUID checksum for seeding other checksums */ 1501 __u32 s_csum_seed; 1502 1503 /* Reclaim extents from extent status tree */ 1504 struct shrinker s_es_shrinker; 1505 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1506 long s_es_nr_inode; 1507 struct ext4_es_stats s_es_stats; 1508 struct mb_cache *s_mb_cache; 1509 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1510 1511 /* Ratelimit ext4 messages. */ 1512 struct ratelimit_state s_err_ratelimit_state; 1513 struct ratelimit_state s_warning_ratelimit_state; 1514 struct ratelimit_state s_msg_ratelimit_state; 1515 1516 /* Barrier between changing inodes' journal flags and writepages ops. */ 1517 struct percpu_rw_semaphore s_journal_flag_rwsem; 1518 1519 /* Encryption support */ 1520 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1521 u8 key_prefix[EXT4_KEY_DESC_PREFIX_SIZE]; 1522 u8 key_prefix_size; 1523 #endif 1524 }; 1525 1526 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1527 { 1528 return sb->s_fs_info; 1529 } 1530 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1531 { 1532 return container_of(inode, struct ext4_inode_info, vfs_inode); 1533 } 1534 1535 static inline struct timespec ext4_current_time(struct inode *inode) 1536 { 1537 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1538 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1539 } 1540 1541 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1542 { 1543 return ino == EXT4_ROOT_INO || 1544 ino == EXT4_USR_QUOTA_INO || 1545 ino == EXT4_GRP_QUOTA_INO || 1546 ino == EXT4_BOOT_LOADER_INO || 1547 ino == EXT4_JOURNAL_INO || 1548 ino == EXT4_RESIZE_INO || 1549 (ino >= EXT4_FIRST_INO(sb) && 1550 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1551 } 1552 1553 /* 1554 * Inode dynamic state flags 1555 */ 1556 enum { 1557 EXT4_STATE_JDATA, /* journaled data exists */ 1558 EXT4_STATE_NEW, /* inode is newly created */ 1559 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1560 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1561 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1562 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1563 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1564 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1565 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read 1566 nolocking */ 1567 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1568 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1569 }; 1570 1571 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1572 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1573 { \ 1574 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1575 } \ 1576 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1577 { \ 1578 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1579 } \ 1580 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1581 { \ 1582 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1583 } 1584 1585 /* Add these declarations here only so that these functions can be 1586 * found by name. Otherwise, they are very hard to locate. */ 1587 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1588 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1589 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1590 EXT4_INODE_BIT_FNS(flag, flags, 0) 1591 1592 /* Add these declarations here only so that these functions can be 1593 * found by name. Otherwise, they are very hard to locate. */ 1594 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1595 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1596 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1597 #if (BITS_PER_LONG < 64) 1598 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1599 1600 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1601 { 1602 (ei)->i_state_flags = 0; 1603 } 1604 #else 1605 EXT4_INODE_BIT_FNS(state, flags, 32) 1606 1607 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1608 { 1609 /* We depend on the fact that callers will set i_flags */ 1610 } 1611 #endif 1612 #else 1613 /* Assume that user mode programs are passing in an ext4fs superblock, not 1614 * a kernel struct super_block. This will allow us to call the feature-test 1615 * macros from user land. */ 1616 #define EXT4_SB(sb) (sb) 1617 #endif 1618 1619 /* 1620 * Returns true if the inode is inode is encrypted 1621 */ 1622 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1623 1624 /* 1625 * Codes for operating systems 1626 */ 1627 #define EXT4_OS_LINUX 0 1628 #define EXT4_OS_HURD 1 1629 #define EXT4_OS_MASIX 2 1630 #define EXT4_OS_FREEBSD 3 1631 #define EXT4_OS_LITES 4 1632 1633 /* 1634 * Revision levels 1635 */ 1636 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1637 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1638 1639 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1640 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1641 1642 #define EXT4_GOOD_OLD_INODE_SIZE 128 1643 1644 /* 1645 * Feature set definitions 1646 */ 1647 1648 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1649 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1650 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1651 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1652 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1653 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1654 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1655 1656 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1657 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1658 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1659 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1660 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1661 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1662 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1663 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1664 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1665 /* 1666 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1667 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1668 * all other data structures' checksums. However, the METADATA_CSUM and 1669 * GDT_CSUM bits are mutually exclusive. 1670 */ 1671 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1672 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1673 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 1674 1675 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1676 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1677 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1678 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1679 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1680 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1681 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1682 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1683 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1684 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1685 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1686 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 1687 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1688 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1689 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1690 1691 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 1692 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1693 { \ 1694 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1695 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 1696 } \ 1697 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1698 { \ 1699 EXT4_SB(sb)->s_es->s_feature_compat |= \ 1700 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1701 } \ 1702 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1703 { \ 1704 EXT4_SB(sb)->s_es->s_feature_compat &= \ 1705 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1706 } 1707 1708 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 1709 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1710 { \ 1711 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1712 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 1713 } \ 1714 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1715 { \ 1716 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 1717 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1718 } \ 1719 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1720 { \ 1721 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 1722 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1723 } 1724 1725 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 1726 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1727 { \ 1728 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1729 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 1730 } \ 1731 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1732 { \ 1733 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 1734 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1735 } \ 1736 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1737 { \ 1738 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 1739 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1740 } 1741 1742 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 1743 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 1744 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 1745 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 1746 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 1747 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 1748 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 1749 1750 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 1751 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 1752 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 1753 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 1754 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 1755 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 1756 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 1757 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 1758 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 1759 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 1760 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 1761 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 1762 1763 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 1764 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 1765 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 1766 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 1767 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 1768 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 1769 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 1770 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 1771 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 1772 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 1773 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 1774 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 1775 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 1776 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 1777 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 1778 1779 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1780 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1781 EXT4_FEATURE_INCOMPAT_META_BG) 1782 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1783 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1784 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1785 1786 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1787 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1788 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1789 EXT4_FEATURE_INCOMPAT_META_BG) 1790 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1791 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1792 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1793 1794 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1795 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1796 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1797 EXT4_FEATURE_INCOMPAT_META_BG| \ 1798 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1799 EXT4_FEATURE_INCOMPAT_64BIT| \ 1800 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1801 EXT4_FEATURE_INCOMPAT_MMP | \ 1802 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 1803 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 1804 EXT4_FEATURE_INCOMPAT_CSUM_SEED) 1805 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1806 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1807 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1808 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1809 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1810 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1811 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1812 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1813 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1814 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 1815 EXT4_FEATURE_RO_COMPAT_PROJECT) 1816 1817 #define EXTN_FEATURE_FUNCS(ver) \ 1818 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 1819 { \ 1820 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1821 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 1822 } \ 1823 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 1824 { \ 1825 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1826 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 1827 } \ 1828 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 1829 { \ 1830 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1831 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 1832 } 1833 1834 EXTN_FEATURE_FUNCS(2) 1835 EXTN_FEATURE_FUNCS(3) 1836 EXTN_FEATURE_FUNCS(4) 1837 1838 static inline bool ext4_has_compat_features(struct super_block *sb) 1839 { 1840 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 1841 } 1842 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 1843 { 1844 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 1845 } 1846 static inline bool ext4_has_incompat_features(struct super_block *sb) 1847 { 1848 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 1849 } 1850 1851 /* 1852 * Default values for user and/or group using reserved blocks 1853 */ 1854 #define EXT4_DEF_RESUID 0 1855 #define EXT4_DEF_RESGID 0 1856 1857 /* 1858 * Default project ID 1859 */ 1860 #define EXT4_DEF_PROJID 0 1861 1862 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1863 1864 /* 1865 * Default mount options 1866 */ 1867 #define EXT4_DEFM_DEBUG 0x0001 1868 #define EXT4_DEFM_BSDGROUPS 0x0002 1869 #define EXT4_DEFM_XATTR_USER 0x0004 1870 #define EXT4_DEFM_ACL 0x0008 1871 #define EXT4_DEFM_UID16 0x0010 1872 #define EXT4_DEFM_JMODE 0x0060 1873 #define EXT4_DEFM_JMODE_DATA 0x0020 1874 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1875 #define EXT4_DEFM_JMODE_WBACK 0x0060 1876 #define EXT4_DEFM_NOBARRIER 0x0100 1877 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1878 #define EXT4_DEFM_DISCARD 0x0400 1879 #define EXT4_DEFM_NODELALLOC 0x0800 1880 1881 /* 1882 * Default journal batch times 1883 */ 1884 #define EXT4_DEF_MIN_BATCH_TIME 0 1885 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1886 1887 /* 1888 * Minimum number of groups in a flexgroup before we separate out 1889 * directories into the first block group of a flexgroup 1890 */ 1891 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1892 1893 /* 1894 * Structure of a directory entry 1895 */ 1896 #define EXT4_NAME_LEN 255 1897 1898 struct ext4_dir_entry { 1899 __le32 inode; /* Inode number */ 1900 __le16 rec_len; /* Directory entry length */ 1901 __le16 name_len; /* Name length */ 1902 char name[EXT4_NAME_LEN]; /* File name */ 1903 }; 1904 1905 /* 1906 * The new version of the directory entry. Since EXT4 structures are 1907 * stored in intel byte order, and the name_len field could never be 1908 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1909 * file_type field. 1910 */ 1911 struct ext4_dir_entry_2 { 1912 __le32 inode; /* Inode number */ 1913 __le16 rec_len; /* Directory entry length */ 1914 __u8 name_len; /* Name length */ 1915 __u8 file_type; 1916 char name[EXT4_NAME_LEN]; /* File name */ 1917 }; 1918 1919 /* 1920 * This is a bogus directory entry at the end of each leaf block that 1921 * records checksums. 1922 */ 1923 struct ext4_dir_entry_tail { 1924 __le32 det_reserved_zero1; /* Pretend to be unused */ 1925 __le16 det_rec_len; /* 12 */ 1926 __u8 det_reserved_zero2; /* Zero name length */ 1927 __u8 det_reserved_ft; /* 0xDE, fake file type */ 1928 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1929 }; 1930 1931 #define EXT4_DIRENT_TAIL(block, blocksize) \ 1932 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 1933 ((blocksize) - \ 1934 sizeof(struct ext4_dir_entry_tail)))) 1935 1936 /* 1937 * Ext4 directory file types. Only the low 3 bits are used. The 1938 * other bits are reserved for now. 1939 */ 1940 #define EXT4_FT_UNKNOWN 0 1941 #define EXT4_FT_REG_FILE 1 1942 #define EXT4_FT_DIR 2 1943 #define EXT4_FT_CHRDEV 3 1944 #define EXT4_FT_BLKDEV 4 1945 #define EXT4_FT_FIFO 5 1946 #define EXT4_FT_SOCK 6 1947 #define EXT4_FT_SYMLINK 7 1948 1949 #define EXT4_FT_MAX 8 1950 1951 #define EXT4_FT_DIR_CSUM 0xDE 1952 1953 /* 1954 * EXT4_DIR_PAD defines the directory entries boundaries 1955 * 1956 * NOTE: It must be a multiple of 4 1957 */ 1958 #define EXT4_DIR_PAD 4 1959 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1960 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1961 ~EXT4_DIR_ROUND) 1962 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1963 1964 /* 1965 * If we ever get support for fs block sizes > page_size, we'll need 1966 * to remove the #if statements in the next two functions... 1967 */ 1968 static inline unsigned int 1969 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1970 { 1971 unsigned len = le16_to_cpu(dlen); 1972 1973 #if (PAGE_SIZE >= 65536) 1974 if (len == EXT4_MAX_REC_LEN || len == 0) 1975 return blocksize; 1976 return (len & 65532) | ((len & 3) << 16); 1977 #else 1978 return len; 1979 #endif 1980 } 1981 1982 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1983 { 1984 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1985 BUG(); 1986 #if (PAGE_SIZE >= 65536) 1987 if (len < 65536) 1988 return cpu_to_le16(len); 1989 if (len == blocksize) { 1990 if (blocksize == 65536) 1991 return cpu_to_le16(EXT4_MAX_REC_LEN); 1992 else 1993 return cpu_to_le16(0); 1994 } 1995 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 1996 #else 1997 return cpu_to_le16(len); 1998 #endif 1999 } 2000 2001 /* 2002 * Hash Tree Directory indexing 2003 * (c) Daniel Phillips, 2001 2004 */ 2005 2006 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2007 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2008 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 2009 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2010 2011 /* Legal values for the dx_root hash_version field: */ 2012 2013 #define DX_HASH_LEGACY 0 2014 #define DX_HASH_HALF_MD4 1 2015 #define DX_HASH_TEA 2 2016 #define DX_HASH_LEGACY_UNSIGNED 3 2017 #define DX_HASH_HALF_MD4_UNSIGNED 4 2018 #define DX_HASH_TEA_UNSIGNED 5 2019 2020 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 2021 const void *address, unsigned int length) 2022 { 2023 struct { 2024 struct shash_desc shash; 2025 char ctx[4]; 2026 } desc; 2027 int err; 2028 2029 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2030 2031 desc.shash.tfm = sbi->s_chksum_driver; 2032 desc.shash.flags = 0; 2033 *(u32 *)desc.ctx = crc; 2034 2035 err = crypto_shash_update(&desc.shash, address, length); 2036 BUG_ON(err); 2037 2038 return *(u32 *)desc.ctx; 2039 } 2040 2041 #ifdef __KERNEL__ 2042 2043 /* hash info structure used by the directory hash */ 2044 struct dx_hash_info 2045 { 2046 u32 hash; 2047 u32 minor_hash; 2048 int hash_version; 2049 u32 *seed; 2050 }; 2051 2052 2053 /* 32 and 64 bit signed EOF for dx directories */ 2054 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2055 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2056 2057 2058 /* 2059 * Control parameters used by ext4_htree_next_block 2060 */ 2061 #define HASH_NB_ALWAYS 1 2062 2063 struct ext4_filename { 2064 const struct qstr *usr_fname; 2065 struct fscrypt_str disk_name; 2066 struct dx_hash_info hinfo; 2067 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2068 struct fscrypt_str crypto_buf; 2069 #endif 2070 }; 2071 2072 #define fname_name(p) ((p)->disk_name.name) 2073 #define fname_len(p) ((p)->disk_name.len) 2074 2075 /* 2076 * Describe an inode's exact location on disk and in memory 2077 */ 2078 struct ext4_iloc 2079 { 2080 struct buffer_head *bh; 2081 unsigned long offset; 2082 ext4_group_t block_group; 2083 }; 2084 2085 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2086 { 2087 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2088 } 2089 2090 /* 2091 * This structure is stuffed into the struct file's private_data field 2092 * for directories. It is where we put information so that we can do 2093 * readdir operations in hash tree order. 2094 */ 2095 struct dir_private_info { 2096 struct rb_root root; 2097 struct rb_node *curr_node; 2098 struct fname *extra_fname; 2099 loff_t last_pos; 2100 __u32 curr_hash; 2101 __u32 curr_minor_hash; 2102 __u32 next_hash; 2103 }; 2104 2105 /* calculate the first block number of the group */ 2106 static inline ext4_fsblk_t 2107 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2108 { 2109 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2110 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2111 } 2112 2113 /* 2114 * Special error return code only used by dx_probe() and its callers. 2115 */ 2116 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2117 2118 /* 2119 * Timeout and state flag for lazy initialization inode thread. 2120 */ 2121 #define EXT4_DEF_LI_WAIT_MULT 10 2122 #define EXT4_DEF_LI_MAX_START_DELAY 5 2123 #define EXT4_LAZYINIT_QUIT 0x0001 2124 #define EXT4_LAZYINIT_RUNNING 0x0002 2125 2126 /* 2127 * Lazy inode table initialization info 2128 */ 2129 struct ext4_lazy_init { 2130 unsigned long li_state; 2131 struct list_head li_request_list; 2132 struct mutex li_list_mtx; 2133 }; 2134 2135 struct ext4_li_request { 2136 struct super_block *lr_super; 2137 struct ext4_sb_info *lr_sbi; 2138 ext4_group_t lr_next_group; 2139 struct list_head lr_request; 2140 unsigned long lr_next_sched; 2141 unsigned long lr_timeout; 2142 }; 2143 2144 struct ext4_features { 2145 struct kobject f_kobj; 2146 struct completion f_kobj_unregister; 2147 }; 2148 2149 /* 2150 * This structure will be used for multiple mount protection. It will be 2151 * written into the block number saved in the s_mmp_block field in the 2152 * superblock. Programs that check MMP should assume that if 2153 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2154 * to use the filesystem, regardless of how old the timestamp is. 2155 */ 2156 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2157 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2158 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2159 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2160 2161 struct mmp_struct { 2162 __le32 mmp_magic; /* Magic number for MMP */ 2163 __le32 mmp_seq; /* Sequence no. updated periodically */ 2164 2165 /* 2166 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2167 * purposes and do not affect the correctness of the algorithm 2168 */ 2169 __le64 mmp_time; /* Time last updated */ 2170 char mmp_nodename[64]; /* Node which last updated MMP block */ 2171 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2172 2173 /* 2174 * mmp_check_interval is used to verify if the MMP block has been 2175 * updated on the block device. The value is updated based on the 2176 * maximum time to write the MMP block during an update cycle. 2177 */ 2178 __le16 mmp_check_interval; 2179 2180 __le16 mmp_pad1; 2181 __le32 mmp_pad2[226]; 2182 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2183 }; 2184 2185 /* arguments passed to the mmp thread */ 2186 struct mmpd_data { 2187 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2188 struct super_block *sb; /* super block of the fs */ 2189 }; 2190 2191 /* 2192 * Check interval multiplier 2193 * The MMP block is written every update interval and initially checked every 2194 * update interval x the multiplier (the value is then adapted based on the 2195 * write latency). The reason is that writes can be delayed under load and we 2196 * don't want readers to incorrectly assume that the filesystem is no longer 2197 * in use. 2198 */ 2199 #define EXT4_MMP_CHECK_MULT 2UL 2200 2201 /* 2202 * Minimum interval for MMP checking in seconds. 2203 */ 2204 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2205 2206 /* 2207 * Maximum interval for MMP checking in seconds. 2208 */ 2209 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2210 2211 /* 2212 * Function prototypes 2213 */ 2214 2215 /* 2216 * Ok, these declarations are also in <linux/kernel.h> but none of the 2217 * ext4 source programs needs to include it so they are duplicated here. 2218 */ 2219 # define NORET_TYPE /**/ 2220 # define ATTRIB_NORET __attribute__((noreturn)) 2221 # define NORET_AND noreturn, 2222 2223 /* bitmap.c */ 2224 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2225 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2226 struct ext4_group_desc *gdp, 2227 struct buffer_head *bh, int sz); 2228 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2229 struct ext4_group_desc *gdp, 2230 struct buffer_head *bh, int sz); 2231 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2232 struct ext4_group_desc *gdp, 2233 struct buffer_head *bh); 2234 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2235 struct ext4_group_desc *gdp, 2236 struct buffer_head *bh); 2237 2238 /* balloc.c */ 2239 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2240 ext4_fsblk_t blocknr, 2241 ext4_group_t *blockgrpp, 2242 ext4_grpblk_t *offsetp); 2243 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2244 ext4_fsblk_t block); 2245 2246 extern unsigned int ext4_block_group(struct super_block *sb, 2247 ext4_fsblk_t blocknr); 2248 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2249 ext4_fsblk_t blocknr); 2250 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2251 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2252 ext4_group_t group); 2253 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2254 ext4_fsblk_t goal, 2255 unsigned int flags, 2256 unsigned long *count, 2257 int *errp); 2258 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2259 s64 nclusters, unsigned int flags); 2260 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2261 extern void ext4_check_blocks_bitmap(struct super_block *); 2262 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2263 ext4_group_t block_group, 2264 struct buffer_head ** bh); 2265 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2266 2267 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2268 ext4_group_t block_group); 2269 extern int ext4_wait_block_bitmap(struct super_block *sb, 2270 ext4_group_t block_group, 2271 struct buffer_head *bh); 2272 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2273 ext4_group_t block_group); 2274 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2275 ext4_group_t block_group, 2276 struct ext4_group_desc *gdp); 2277 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2278 2279 static inline int ext4_sb_has_crypto(struct super_block *sb) 2280 { 2281 return ext4_has_feature_encrypt(sb); 2282 } 2283 2284 static inline bool ext4_encrypted_inode(struct inode *inode) 2285 { 2286 return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT); 2287 } 2288 2289 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2290 static inline int ext4_fname_setup_filename(struct inode *dir, 2291 const struct qstr *iname, 2292 int lookup, struct ext4_filename *fname) 2293 { 2294 struct fscrypt_name name; 2295 int err; 2296 2297 memset(fname, 0, sizeof(struct ext4_filename)); 2298 2299 err = fscrypt_setup_filename(dir, iname, lookup, &name); 2300 2301 fname->usr_fname = name.usr_fname; 2302 fname->disk_name = name.disk_name; 2303 fname->hinfo.hash = name.hash; 2304 fname->hinfo.minor_hash = name.minor_hash; 2305 fname->crypto_buf = name.crypto_buf; 2306 return err; 2307 } 2308 2309 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2310 { 2311 struct fscrypt_name name; 2312 2313 name.crypto_buf = fname->crypto_buf; 2314 fscrypt_free_filename(&name); 2315 2316 fname->crypto_buf.name = NULL; 2317 fname->usr_fname = NULL; 2318 fname->disk_name.name = NULL; 2319 } 2320 #else 2321 static inline int ext4_fname_setup_filename(struct inode *dir, 2322 const struct qstr *iname, 2323 int lookup, struct ext4_filename *fname) 2324 { 2325 fname->usr_fname = iname; 2326 fname->disk_name.name = (unsigned char *) iname->name; 2327 fname->disk_name.len = iname->len; 2328 return 0; 2329 } 2330 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { } 2331 2332 #define fscrypt_set_d_op(i) 2333 #define fscrypt_get_ctx fscrypt_notsupp_get_ctx 2334 #define fscrypt_release_ctx fscrypt_notsupp_release_ctx 2335 #define fscrypt_encrypt_page fscrypt_notsupp_encrypt_page 2336 #define fscrypt_decrypt_page fscrypt_notsupp_decrypt_page 2337 #define fscrypt_decrypt_bio_pages fscrypt_notsupp_decrypt_bio_pages 2338 #define fscrypt_pullback_bio_page fscrypt_notsupp_pullback_bio_page 2339 #define fscrypt_restore_control_page fscrypt_notsupp_restore_control_page 2340 #define fscrypt_zeroout_range fscrypt_notsupp_zeroout_range 2341 #define fscrypt_process_policy fscrypt_notsupp_process_policy 2342 #define fscrypt_get_policy fscrypt_notsupp_get_policy 2343 #define fscrypt_has_permitted_context fscrypt_notsupp_has_permitted_context 2344 #define fscrypt_inherit_context fscrypt_notsupp_inherit_context 2345 #define fscrypt_get_encryption_info fscrypt_notsupp_get_encryption_info 2346 #define fscrypt_put_encryption_info fscrypt_notsupp_put_encryption_info 2347 #define fscrypt_setup_filename fscrypt_notsupp_setup_filename 2348 #define fscrypt_free_filename fscrypt_notsupp_free_filename 2349 #define fscrypt_fname_encrypted_size fscrypt_notsupp_fname_encrypted_size 2350 #define fscrypt_fname_alloc_buffer fscrypt_notsupp_fname_alloc_buffer 2351 #define fscrypt_fname_free_buffer fscrypt_notsupp_fname_free_buffer 2352 #define fscrypt_fname_disk_to_usr fscrypt_notsupp_fname_disk_to_usr 2353 #define fscrypt_fname_usr_to_disk fscrypt_notsupp_fname_usr_to_disk 2354 #endif 2355 2356 /* dir.c */ 2357 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2358 struct file *, 2359 struct ext4_dir_entry_2 *, 2360 struct buffer_head *, char *, int, 2361 unsigned int); 2362 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2363 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2364 (de), (bh), (buf), (size), (offset))) 2365 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2366 __u32 minor_hash, 2367 struct ext4_dir_entry_2 *dirent, 2368 struct fscrypt_str *ent_name); 2369 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2370 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2371 struct buffer_head *bh, 2372 void *buf, int buf_size, 2373 struct ext4_filename *fname, 2374 struct ext4_dir_entry_2 **dest_de); 2375 int ext4_insert_dentry(struct inode *dir, 2376 struct inode *inode, 2377 struct ext4_dir_entry_2 *de, 2378 int buf_size, 2379 struct ext4_filename *fname); 2380 static inline void ext4_update_dx_flag(struct inode *inode) 2381 { 2382 if (!ext4_has_feature_dir_index(inode->i_sb)) 2383 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2384 } 2385 static unsigned char ext4_filetype_table[] = { 2386 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2387 }; 2388 2389 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2390 { 2391 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2392 return DT_UNKNOWN; 2393 2394 return ext4_filetype_table[filetype]; 2395 } 2396 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2397 void *buf, int buf_size); 2398 2399 /* fsync.c */ 2400 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2401 2402 /* hash.c */ 2403 extern int ext4fs_dirhash(const char *name, int len, struct 2404 dx_hash_info *hinfo); 2405 2406 /* ialloc.c */ 2407 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2408 const struct qstr *qstr, __u32 goal, 2409 uid_t *owner, int handle_type, 2410 unsigned int line_no, int nblocks); 2411 2412 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \ 2413 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2414 0, 0, 0) 2415 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2416 type, nblocks) \ 2417 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2418 (type), __LINE__, (nblocks)) 2419 2420 2421 extern void ext4_free_inode(handle_t *, struct inode *); 2422 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2423 extern unsigned long ext4_count_free_inodes(struct super_block *); 2424 extern unsigned long ext4_count_dirs(struct super_block *); 2425 extern void ext4_check_inodes_bitmap(struct super_block *); 2426 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2427 extern int ext4_init_inode_table(struct super_block *sb, 2428 ext4_group_t group, int barrier); 2429 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2430 2431 /* mballoc.c */ 2432 extern const struct file_operations ext4_seq_mb_groups_fops; 2433 extern long ext4_mb_stats; 2434 extern long ext4_mb_max_to_scan; 2435 extern int ext4_mb_init(struct super_block *); 2436 extern int ext4_mb_release(struct super_block *); 2437 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2438 struct ext4_allocation_request *, int *); 2439 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2440 extern void ext4_discard_preallocations(struct inode *); 2441 extern int __init ext4_init_mballoc(void); 2442 extern void ext4_exit_mballoc(void); 2443 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2444 struct buffer_head *bh, ext4_fsblk_t block, 2445 unsigned long count, int flags); 2446 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2447 ext4_group_t ngroups); 2448 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2449 ext4_group_t i, struct ext4_group_desc *desc); 2450 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2451 ext4_fsblk_t block, unsigned long count); 2452 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2453 2454 /* inode.c */ 2455 int ext4_inode_is_fast_symlink(struct inode *inode); 2456 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2457 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2458 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2459 struct buffer_head *bh_result, int create); 2460 int ext4_dax_get_block(struct inode *inode, sector_t iblock, 2461 struct buffer_head *bh_result, int create); 2462 int ext4_get_block(struct inode *inode, sector_t iblock, 2463 struct buffer_head *bh_result, int create); 2464 int ext4_dio_get_block(struct inode *inode, sector_t iblock, 2465 struct buffer_head *bh_result, int create); 2466 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2467 struct buffer_head *bh, int create); 2468 int ext4_walk_page_buffers(handle_t *handle, 2469 struct buffer_head *head, 2470 unsigned from, 2471 unsigned to, 2472 int *partial, 2473 int (*fn)(handle_t *handle, 2474 struct buffer_head *bh)); 2475 int do_journal_get_write_access(handle_t *handle, 2476 struct buffer_head *bh); 2477 #define FALL_BACK_TO_NONDELALLOC 1 2478 #define CONVERT_INLINE_DATA 2 2479 2480 extern struct inode *ext4_iget(struct super_block *, unsigned long); 2481 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long); 2482 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2483 extern int ext4_setattr(struct dentry *, struct iattr *); 2484 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 2485 struct kstat *stat); 2486 extern void ext4_evict_inode(struct inode *); 2487 extern void ext4_clear_inode(struct inode *); 2488 extern int ext4_sync_inode(handle_t *, struct inode *); 2489 extern void ext4_dirty_inode(struct inode *, int); 2490 extern int ext4_change_inode_journal_flag(struct inode *, int); 2491 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2492 extern int ext4_inode_attach_jinode(struct inode *inode); 2493 extern int ext4_can_truncate(struct inode *inode); 2494 extern void ext4_truncate(struct inode *); 2495 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2496 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 2497 extern void ext4_set_inode_flags(struct inode *); 2498 extern void ext4_get_inode_flags(struct ext4_inode_info *); 2499 extern int ext4_alloc_da_blocks(struct inode *inode); 2500 extern void ext4_set_aops(struct inode *inode); 2501 extern int ext4_writepage_trans_blocks(struct inode *); 2502 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2503 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2504 loff_t lstart, loff_t lend); 2505 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 2506 extern int ext4_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf); 2507 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2508 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 2509 extern void ext4_da_update_reserve_space(struct inode *inode, 2510 int used, int quota_claim); 2511 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 2512 ext4_fsblk_t pblk, ext4_lblk_t len); 2513 extern int ext4_get_next_extent(struct inode *inode, ext4_lblk_t lblk, 2514 unsigned int map_len, 2515 struct extent_status *result); 2516 2517 /* indirect.c */ 2518 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2519 struct ext4_map_blocks *map, int flags); 2520 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2521 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2522 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2523 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2524 ext4_lblk_t start, ext4_lblk_t end); 2525 2526 /* ioctl.c */ 2527 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2528 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2529 2530 /* migrate.c */ 2531 extern int ext4_ext_migrate(struct inode *); 2532 extern int ext4_ind_migrate(struct inode *inode); 2533 2534 /* namei.c */ 2535 extern int ext4_dirent_csum_verify(struct inode *inode, 2536 struct ext4_dir_entry *dirent); 2537 extern int ext4_orphan_add(handle_t *, struct inode *); 2538 extern int ext4_orphan_del(handle_t *, struct inode *); 2539 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2540 __u32 start_minor_hash, __u32 *next_hash); 2541 extern int ext4_search_dir(struct buffer_head *bh, 2542 char *search_buf, 2543 int buf_size, 2544 struct inode *dir, 2545 struct ext4_filename *fname, 2546 const struct qstr *d_name, 2547 unsigned int offset, 2548 struct ext4_dir_entry_2 **res_dir); 2549 extern int ext4_generic_delete_entry(handle_t *handle, 2550 struct inode *dir, 2551 struct ext4_dir_entry_2 *de_del, 2552 struct buffer_head *bh, 2553 void *entry_buf, 2554 int buf_size, 2555 int csum_size); 2556 extern bool ext4_empty_dir(struct inode *inode); 2557 2558 /* resize.c */ 2559 extern int ext4_group_add(struct super_block *sb, 2560 struct ext4_new_group_data *input); 2561 extern int ext4_group_extend(struct super_block *sb, 2562 struct ext4_super_block *es, 2563 ext4_fsblk_t n_blocks_count); 2564 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2565 2566 /* super.c */ 2567 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 2568 extern int ext4_calculate_overhead(struct super_block *sb); 2569 extern void ext4_superblock_csum_set(struct super_block *sb); 2570 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 2571 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 2572 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2573 ext4_group_t ngroup); 2574 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2575 char nbuf[16]); 2576 2577 extern __printf(4, 5) 2578 void __ext4_error(struct super_block *, const char *, unsigned int, 2579 const char *, ...); 2580 extern __printf(5, 6) 2581 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2582 const char *, ...); 2583 extern __printf(5, 6) 2584 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2585 const char *, ...); 2586 extern void __ext4_std_error(struct super_block *, const char *, 2587 unsigned int, int); 2588 extern __printf(4, 5) 2589 void __ext4_abort(struct super_block *, const char *, unsigned int, 2590 const char *, ...); 2591 extern __printf(4, 5) 2592 void __ext4_warning(struct super_block *, const char *, unsigned int, 2593 const char *, ...); 2594 extern __printf(4, 5) 2595 void __ext4_warning_inode(const struct inode *inode, const char *function, 2596 unsigned int line, const char *fmt, ...); 2597 extern __printf(3, 4) 2598 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2599 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2600 const char *, unsigned int, const char *); 2601 extern __printf(7, 8) 2602 void __ext4_grp_locked_error(const char *, unsigned int, 2603 struct super_block *, ext4_group_t, 2604 unsigned long, ext4_fsblk_t, 2605 const char *, ...); 2606 2607 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 2608 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 2609 2610 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 2611 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 2612 2613 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 2614 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 2615 2616 #ifdef CONFIG_PRINTK 2617 2618 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2619 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__) 2620 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2621 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2622 #define ext4_error(sb, fmt, ...) \ 2623 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2624 #define ext4_abort(sb, fmt, ...) \ 2625 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2626 #define ext4_warning(sb, fmt, ...) \ 2627 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2628 #define ext4_warning_inode(inode, fmt, ...) \ 2629 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 2630 #define ext4_msg(sb, level, fmt, ...) \ 2631 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 2632 #define dump_mmp_msg(sb, mmp, msg) \ 2633 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 2634 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2635 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 2636 fmt, ##__VA_ARGS__) 2637 2638 #else 2639 2640 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2641 do { \ 2642 no_printk(fmt, ##__VA_ARGS__); \ 2643 __ext4_error_inode(inode, "", 0, block, " "); \ 2644 } while (0) 2645 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2646 do { \ 2647 no_printk(fmt, ##__VA_ARGS__); \ 2648 __ext4_error_file(file, "", 0, block, " "); \ 2649 } while (0) 2650 #define ext4_error(sb, fmt, ...) \ 2651 do { \ 2652 no_printk(fmt, ##__VA_ARGS__); \ 2653 __ext4_error(sb, "", 0, " "); \ 2654 } while (0) 2655 #define ext4_abort(sb, fmt, ...) \ 2656 do { \ 2657 no_printk(fmt, ##__VA_ARGS__); \ 2658 __ext4_abort(sb, "", 0, " "); \ 2659 } while (0) 2660 #define ext4_warning(sb, fmt, ...) \ 2661 do { \ 2662 no_printk(fmt, ##__VA_ARGS__); \ 2663 __ext4_warning(sb, "", 0, " "); \ 2664 } while (0) 2665 #define ext4_warning_inode(inode, fmt, ...) \ 2666 do { \ 2667 no_printk(fmt, ##__VA_ARGS__); \ 2668 __ext4_warning_inode(inode, "", 0, " "); \ 2669 } while (0) 2670 #define ext4_msg(sb, level, fmt, ...) \ 2671 do { \ 2672 no_printk(fmt, ##__VA_ARGS__); \ 2673 __ext4_msg(sb, "", " "); \ 2674 } while (0) 2675 #define dump_mmp_msg(sb, mmp, msg) \ 2676 __dump_mmp_msg(sb, mmp, "", 0, "") 2677 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2678 do { \ 2679 no_printk(fmt, ##__VA_ARGS__); \ 2680 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 2681 } while (0) 2682 2683 #endif 2684 2685 extern void ext4_update_dynamic_rev(struct super_block *sb); 2686 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2687 __u32 compat); 2688 extern int ext4_update_rocompat_feature(handle_t *handle, 2689 struct super_block *sb, __u32 rocompat); 2690 extern int ext4_update_incompat_feature(handle_t *handle, 2691 struct super_block *sb, __u32 incompat); 2692 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2693 struct ext4_group_desc *bg); 2694 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2695 struct ext4_group_desc *bg); 2696 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2697 struct ext4_group_desc *bg); 2698 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2699 struct ext4_group_desc *bg); 2700 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2701 struct ext4_group_desc *bg); 2702 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2703 struct ext4_group_desc *bg); 2704 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2705 struct ext4_group_desc *bg); 2706 extern void ext4_block_bitmap_set(struct super_block *sb, 2707 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2708 extern void ext4_inode_bitmap_set(struct super_block *sb, 2709 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2710 extern void ext4_inode_table_set(struct super_block *sb, 2711 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2712 extern void ext4_free_group_clusters_set(struct super_block *sb, 2713 struct ext4_group_desc *bg, 2714 __u32 count); 2715 extern void ext4_free_inodes_set(struct super_block *sb, 2716 struct ext4_group_desc *bg, __u32 count); 2717 extern void ext4_used_dirs_set(struct super_block *sb, 2718 struct ext4_group_desc *bg, __u32 count); 2719 extern void ext4_itable_unused_set(struct super_block *sb, 2720 struct ext4_group_desc *bg, __u32 count); 2721 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2722 struct ext4_group_desc *gdp); 2723 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2724 struct ext4_group_desc *gdp); 2725 extern int ext4_register_li_request(struct super_block *sb, 2726 ext4_group_t first_not_zeroed); 2727 2728 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2729 { 2730 return ext4_has_feature_gdt_csum(sb) || 2731 EXT4_SB(sb)->s_chksum_driver != NULL; 2732 } 2733 2734 static inline int ext4_has_metadata_csum(struct super_block *sb) 2735 { 2736 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 2737 !EXT4_SB(sb)->s_chksum_driver); 2738 2739 return (EXT4_SB(sb)->s_chksum_driver != NULL); 2740 } 2741 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2742 { 2743 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2744 le32_to_cpu(es->s_blocks_count_lo); 2745 } 2746 2747 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2748 { 2749 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2750 le32_to_cpu(es->s_r_blocks_count_lo); 2751 } 2752 2753 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2754 { 2755 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2756 le32_to_cpu(es->s_free_blocks_count_lo); 2757 } 2758 2759 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2760 ext4_fsblk_t blk) 2761 { 2762 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2763 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2764 } 2765 2766 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2767 ext4_fsblk_t blk) 2768 { 2769 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2770 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2771 } 2772 2773 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2774 ext4_fsblk_t blk) 2775 { 2776 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2777 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2778 } 2779 2780 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 2781 { 2782 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2783 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2784 le32_to_cpu(raw_inode->i_size_lo); 2785 else 2786 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2787 } 2788 2789 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2790 { 2791 raw_inode->i_size_lo = cpu_to_le32(i_size); 2792 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2793 } 2794 2795 static inline 2796 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2797 ext4_group_t group) 2798 { 2799 struct ext4_group_info ***grp_info; 2800 long indexv, indexh; 2801 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 2802 grp_info = EXT4_SB(sb)->s_group_info; 2803 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2804 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2805 return grp_info[indexv][indexh]; 2806 } 2807 2808 /* 2809 * Reading s_groups_count requires using smp_rmb() afterwards. See 2810 * the locking protocol documented in the comments of ext4_group_add() 2811 * in resize.c 2812 */ 2813 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2814 { 2815 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2816 2817 smp_rmb(); 2818 return ngroups; 2819 } 2820 2821 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2822 ext4_group_t block_group) 2823 { 2824 return block_group >> sbi->s_log_groups_per_flex; 2825 } 2826 2827 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2828 { 2829 return 1 << sbi->s_log_groups_per_flex; 2830 } 2831 2832 #define ext4_std_error(sb, errno) \ 2833 do { \ 2834 if ((errno)) \ 2835 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2836 } while (0) 2837 2838 #ifdef CONFIG_SMP 2839 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2840 * counters. So we need to make sure we have free clusters more 2841 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2842 */ 2843 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2844 #else 2845 #define EXT4_FREECLUSTERS_WATERMARK 0 2846 #endif 2847 2848 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 2849 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2850 { 2851 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 2852 !inode_is_locked(inode)); 2853 down_write(&EXT4_I(inode)->i_data_sem); 2854 if (newsize > EXT4_I(inode)->i_disksize) 2855 EXT4_I(inode)->i_disksize = newsize; 2856 up_write(&EXT4_I(inode)->i_data_sem); 2857 } 2858 2859 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 2860 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 2861 { 2862 int changed = 0; 2863 2864 if (newsize > inode->i_size) { 2865 i_size_write(inode, newsize); 2866 changed = 1; 2867 } 2868 if (newsize > EXT4_I(inode)->i_disksize) { 2869 ext4_update_i_disksize(inode, newsize); 2870 changed |= 2; 2871 } 2872 return changed; 2873 } 2874 2875 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 2876 loff_t len); 2877 2878 struct ext4_group_info { 2879 unsigned long bb_state; 2880 struct rb_root bb_free_root; 2881 ext4_grpblk_t bb_first_free; /* first free block */ 2882 ext4_grpblk_t bb_free; /* total free blocks */ 2883 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 2884 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 2885 struct list_head bb_prealloc_list; 2886 #ifdef DOUBLE_CHECK 2887 void *bb_bitmap; 2888 #endif 2889 struct rw_semaphore alloc_sem; 2890 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2891 * regions, index is order. 2892 * bb_counters[3] = 5 means 2893 * 5 free 8-block regions. */ 2894 }; 2895 2896 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 2897 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 2898 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 2899 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 2900 2901 #define EXT4_MB_GRP_NEED_INIT(grp) \ 2902 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 2903 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 2904 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2905 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 2906 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2907 2908 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 2909 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2910 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 2911 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2912 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 2913 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2914 2915 #define EXT4_MAX_CONTENTION 8 2916 #define EXT4_CONTENTION_THRESHOLD 2 2917 2918 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2919 ext4_group_t group) 2920 { 2921 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2922 } 2923 2924 /* 2925 * Returns true if the filesystem is busy enough that attempts to 2926 * access the block group locks has run into contention. 2927 */ 2928 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 2929 { 2930 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 2931 } 2932 2933 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 2934 { 2935 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 2936 if (spin_trylock(lock)) 2937 /* 2938 * We're able to grab the lock right away, so drop the 2939 * lock contention counter. 2940 */ 2941 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 2942 else { 2943 /* 2944 * The lock is busy, so bump the contention counter, 2945 * and then wait on the spin lock. 2946 */ 2947 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 2948 EXT4_MAX_CONTENTION); 2949 spin_lock(lock); 2950 } 2951 } 2952 2953 static inline void ext4_unlock_group(struct super_block *sb, 2954 ext4_group_t group) 2955 { 2956 spin_unlock(ext4_group_lock_ptr(sb, group)); 2957 } 2958 2959 /* 2960 * Block validity checking 2961 */ 2962 #define ext4_check_indirect_blockref(inode, bh) \ 2963 ext4_check_blockref(__func__, __LINE__, inode, \ 2964 (__le32 *)(bh)->b_data, \ 2965 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 2966 2967 #define ext4_ind_check_inode(inode) \ 2968 ext4_check_blockref(__func__, __LINE__, inode, \ 2969 EXT4_I(inode)->i_data, \ 2970 EXT4_NDIR_BLOCKS) 2971 2972 /* 2973 * Inodes and files operations 2974 */ 2975 2976 /* dir.c */ 2977 extern const struct file_operations ext4_dir_operations; 2978 2979 /* file.c */ 2980 extern const struct inode_operations ext4_file_inode_operations; 2981 extern const struct file_operations ext4_file_operations; 2982 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 2983 2984 /* inline.c */ 2985 extern int ext4_get_max_inline_size(struct inode *inode); 2986 extern int ext4_find_inline_data_nolock(struct inode *inode); 2987 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 2988 unsigned int len); 2989 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 2990 2991 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 2992 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 2993 struct inode *inode, 2994 loff_t pos, unsigned len, 2995 unsigned flags, 2996 struct page **pagep); 2997 extern int ext4_write_inline_data_end(struct inode *inode, 2998 loff_t pos, unsigned len, 2999 unsigned copied, 3000 struct page *page); 3001 extern struct buffer_head * 3002 ext4_journalled_write_inline_data(struct inode *inode, 3003 unsigned len, 3004 struct page *page); 3005 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 3006 struct inode *inode, 3007 loff_t pos, unsigned len, 3008 unsigned flags, 3009 struct page **pagep, 3010 void **fsdata); 3011 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 3012 unsigned len, unsigned copied, 3013 struct page *page); 3014 extern int ext4_try_add_inline_entry(handle_t *handle, 3015 struct ext4_filename *fname, 3016 struct inode *dir, struct inode *inode); 3017 extern int ext4_try_create_inline_dir(handle_t *handle, 3018 struct inode *parent, 3019 struct inode *inode); 3020 extern int ext4_read_inline_dir(struct file *filp, 3021 struct dir_context *ctx, 3022 int *has_inline_data); 3023 extern int htree_inlinedir_to_tree(struct file *dir_file, 3024 struct inode *dir, ext4_lblk_t block, 3025 struct dx_hash_info *hinfo, 3026 __u32 start_hash, __u32 start_minor_hash, 3027 int *has_inline_data); 3028 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3029 struct ext4_filename *fname, 3030 const struct qstr *d_name, 3031 struct ext4_dir_entry_2 **res_dir, 3032 int *has_inline_data); 3033 extern int ext4_delete_inline_entry(handle_t *handle, 3034 struct inode *dir, 3035 struct ext4_dir_entry_2 *de_del, 3036 struct buffer_head *bh, 3037 int *has_inline_data); 3038 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); 3039 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3040 struct ext4_dir_entry_2 **parent_de, 3041 int *retval); 3042 extern int ext4_inline_data_fiemap(struct inode *inode, 3043 struct fiemap_extent_info *fieinfo, 3044 int *has_inline, __u64 start, __u64 len); 3045 extern int ext4_try_to_evict_inline_data(handle_t *handle, 3046 struct inode *inode, 3047 int needed); 3048 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3049 3050 extern int ext4_convert_inline_data(struct inode *inode); 3051 3052 static inline int ext4_has_inline_data(struct inode *inode) 3053 { 3054 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3055 EXT4_I(inode)->i_inline_off; 3056 } 3057 3058 /* namei.c */ 3059 extern const struct inode_operations ext4_dir_inode_operations; 3060 extern const struct inode_operations ext4_special_inode_operations; 3061 extern struct dentry *ext4_get_parent(struct dentry *child); 3062 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3063 struct ext4_dir_entry_2 *de, 3064 int blocksize, int csum_size, 3065 unsigned int parent_ino, int dotdot_real_len); 3066 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t, 3067 unsigned int blocksize); 3068 extern int ext4_handle_dirty_dirent_node(handle_t *handle, 3069 struct inode *inode, 3070 struct buffer_head *bh); 3071 #define S_SHIFT 12 3072 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = { 3073 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3074 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3075 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3076 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3077 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3078 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3079 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3080 }; 3081 3082 static inline void ext4_set_de_type(struct super_block *sb, 3083 struct ext4_dir_entry_2 *de, 3084 umode_t mode) { 3085 if (ext4_has_feature_filetype(sb)) 3086 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3087 } 3088 3089 /* readpages.c */ 3090 extern int ext4_mpage_readpages(struct address_space *mapping, 3091 struct list_head *pages, struct page *page, 3092 unsigned nr_pages); 3093 3094 /* symlink.c */ 3095 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3096 extern const struct inode_operations ext4_symlink_inode_operations; 3097 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3098 3099 /* sysfs.c */ 3100 extern int ext4_register_sysfs(struct super_block *sb); 3101 extern void ext4_unregister_sysfs(struct super_block *sb); 3102 extern int __init ext4_init_sysfs(void); 3103 extern void ext4_exit_sysfs(void); 3104 3105 /* block_validity */ 3106 extern void ext4_release_system_zone(struct super_block *sb); 3107 extern int ext4_setup_system_zone(struct super_block *sb); 3108 extern int __init ext4_init_system_zone(void); 3109 extern void ext4_exit_system_zone(void); 3110 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 3111 ext4_fsblk_t start_blk, 3112 unsigned int count); 3113 extern int ext4_check_blockref(const char *, unsigned int, 3114 struct inode *, __le32 *, unsigned int); 3115 3116 /* extents.c */ 3117 struct ext4_ext_path; 3118 struct ext4_extent; 3119 3120 /* 3121 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3122 * __le32. 3123 */ 3124 #define EXT_MAX_BLOCKS 0xffffffff 3125 3126 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 3127 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 3128 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3129 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3130 struct ext4_map_blocks *map, int flags); 3131 extern void ext4_ext_truncate(handle_t *, struct inode *); 3132 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3133 ext4_lblk_t end); 3134 extern void ext4_ext_init(struct super_block *); 3135 extern void ext4_ext_release(struct super_block *); 3136 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3137 loff_t len); 3138 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3139 loff_t offset, ssize_t len); 3140 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3141 struct ext4_map_blocks *map, int flags); 3142 extern int ext4_ext_calc_metadata_amount(struct inode *inode, 3143 ext4_lblk_t lblocks); 3144 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3145 int num, 3146 struct ext4_ext_path *path); 3147 extern int ext4_can_extents_be_merged(struct inode *inode, 3148 struct ext4_extent *ex1, 3149 struct ext4_extent *ex2); 3150 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3151 struct ext4_ext_path **, 3152 struct ext4_extent *, int); 3153 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3154 struct ext4_ext_path **, 3155 int flags); 3156 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 3157 extern int ext4_ext_check_inode(struct inode *inode); 3158 extern int ext4_find_delalloc_range(struct inode *inode, 3159 ext4_lblk_t lblk_start, 3160 ext4_lblk_t lblk_end); 3161 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk); 3162 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3163 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3164 __u64 start, __u64 len); 3165 extern int ext4_ext_precache(struct inode *inode); 3166 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len); 3167 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len); 3168 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3169 struct inode *inode2, ext4_lblk_t lblk1, 3170 ext4_lblk_t lblk2, ext4_lblk_t count, 3171 int mark_unwritten,int *err); 3172 3173 /* move_extent.c */ 3174 extern void ext4_double_down_write_data_sem(struct inode *first, 3175 struct inode *second); 3176 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3177 struct inode *donor_inode); 3178 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3179 __u64 start_orig, __u64 start_donor, 3180 __u64 len, __u64 *moved_len); 3181 3182 /* page-io.c */ 3183 extern int __init ext4_init_pageio(void); 3184 extern void ext4_exit_pageio(void); 3185 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3186 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3187 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3188 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3189 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3190 struct writeback_control *wbc); 3191 extern void ext4_end_io_rsv_work(struct work_struct *work); 3192 extern void ext4_io_submit(struct ext4_io_submit *io); 3193 extern int ext4_bio_write_page(struct ext4_io_submit *io, 3194 struct page *page, 3195 int len, 3196 struct writeback_control *wbc, 3197 bool keep_towrite); 3198 3199 /* mmp.c */ 3200 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3201 3202 /* 3203 * Add new method to test whether block and inode bitmaps are properly 3204 * initialized. With uninit_bg reading the block from disk is not enough 3205 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3206 */ 3207 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3208 3209 static inline int bitmap_uptodate(struct buffer_head *bh) 3210 { 3211 return (buffer_uptodate(bh) && 3212 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3213 } 3214 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3215 { 3216 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3217 } 3218 3219 /* 3220 * Disable DIO read nolock optimization, so new dioreaders will be forced 3221 * to grab i_mutex 3222 */ 3223 static inline void ext4_inode_block_unlocked_dio(struct inode *inode) 3224 { 3225 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 3226 smp_mb(); 3227 } 3228 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode) 3229 { 3230 smp_mb(); 3231 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 3232 } 3233 3234 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3235 3236 /* For ioend & aio unwritten conversion wait queues */ 3237 #define EXT4_WQ_HASH_SZ 37 3238 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3239 EXT4_WQ_HASH_SZ]) 3240 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3241 3242 #define EXT4_RESIZING 0 3243 extern int ext4_resize_begin(struct super_block *sb); 3244 extern void ext4_resize_end(struct super_block *sb); 3245 3246 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 3247 struct ext4_io_end *io_end) 3248 { 3249 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 3250 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3251 atomic_inc(&EXT4_I(inode)->i_unwritten); 3252 } 3253 } 3254 3255 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3256 { 3257 struct inode *inode = io_end->inode; 3258 3259 if (io_end->flag & EXT4_IO_END_UNWRITTEN) { 3260 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3261 /* Wake up anyone waiting on unwritten extent conversion */ 3262 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) 3263 wake_up_all(ext4_ioend_wq(inode)); 3264 } 3265 } 3266 3267 static inline bool ext4_aligned_io(struct inode *inode, loff_t off, loff_t len) 3268 { 3269 int blksize = 1 << inode->i_blkbits; 3270 3271 return IS_ALIGNED(off, blksize) && IS_ALIGNED(len, blksize); 3272 } 3273 3274 #endif /* __KERNEL__ */ 3275 3276 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3277 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3278 3279 #endif /* _EXT4_H */ 3280