1 /* 2 * ext4.h 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/include/linux/minix_fs.h 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 */ 15 16 #ifndef _EXT4_H 17 #define _EXT4_H 18 19 #include <linux/types.h> 20 #include <linux/blkdev.h> 21 #include <linux/magic.h> 22 #include <linux/jbd2.h> 23 #include <linux/quota.h> 24 #include <linux/rwsem.h> 25 #include <linux/rbtree.h> 26 #include <linux/seqlock.h> 27 #include <linux/mutex.h> 28 #include <linux/timer.h> 29 #include <linux/version.h> 30 #include <linux/wait.h> 31 #include <linux/blockgroup_lock.h> 32 #include <linux/percpu_counter.h> 33 #include <linux/ratelimit.h> 34 #include <crypto/hash.h> 35 #include <linux/fscrypto.h> 36 #include <linux/falloc.h> 37 #include <linux/percpu-rwsem.h> 38 #ifdef __KERNEL__ 39 #include <linux/compat.h> 40 #endif 41 42 /* 43 * The fourth extended filesystem constants/structures 44 */ 45 46 /* 47 * with AGGRESSIVE_CHECK allocator runs consistency checks over 48 * structures. these checks slow things down a lot 49 */ 50 #define AGGRESSIVE_CHECK__ 51 52 /* 53 * with DOUBLE_CHECK defined mballoc creates persistent in-core 54 * bitmaps, maintains and uses them to check for double allocations 55 */ 56 #define DOUBLE_CHECK__ 57 58 /* 59 * Define EXT4FS_DEBUG to produce debug messages 60 */ 61 #undef EXT4FS_DEBUG 62 63 /* 64 * Debug code 65 */ 66 #ifdef EXT4FS_DEBUG 67 #define ext4_debug(f, a...) \ 68 do { \ 69 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 70 __FILE__, __LINE__, __func__); \ 71 printk(KERN_DEBUG f, ## a); \ 72 } while (0) 73 #else 74 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 75 #endif 76 77 /* 78 * Turn on EXT_DEBUG to get lots of info about extents operations. 79 */ 80 #define EXT_DEBUG__ 81 #ifdef EXT_DEBUG 82 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__) 83 #else 84 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 85 #endif 86 87 /* data type for block offset of block group */ 88 typedef int ext4_grpblk_t; 89 90 /* data type for filesystem-wide blocks number */ 91 typedef unsigned long long ext4_fsblk_t; 92 93 /* data type for file logical block number */ 94 typedef __u32 ext4_lblk_t; 95 96 /* data type for block group number */ 97 typedef unsigned int ext4_group_t; 98 99 enum SHIFT_DIRECTION { 100 SHIFT_LEFT = 0, 101 SHIFT_RIGHT, 102 }; 103 104 /* 105 * Flags used in mballoc's allocation_context flags field. 106 * 107 * Also used to show what's going on for debugging purposes when the 108 * flag field is exported via the traceport interface 109 */ 110 111 /* prefer goal again. length */ 112 #define EXT4_MB_HINT_MERGE 0x0001 113 /* blocks already reserved */ 114 #define EXT4_MB_HINT_RESERVED 0x0002 115 /* metadata is being allocated */ 116 #define EXT4_MB_HINT_METADATA 0x0004 117 /* first blocks in the file */ 118 #define EXT4_MB_HINT_FIRST 0x0008 119 /* search for the best chunk */ 120 #define EXT4_MB_HINT_BEST 0x0010 121 /* data is being allocated */ 122 #define EXT4_MB_HINT_DATA 0x0020 123 /* don't preallocate (for tails) */ 124 #define EXT4_MB_HINT_NOPREALLOC 0x0040 125 /* allocate for locality group */ 126 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 127 /* allocate goal blocks or none */ 128 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 129 /* goal is meaningful */ 130 #define EXT4_MB_HINT_TRY_GOAL 0x0200 131 /* blocks already pre-reserved by delayed allocation */ 132 #define EXT4_MB_DELALLOC_RESERVED 0x0400 133 /* We are doing stream allocation */ 134 #define EXT4_MB_STREAM_ALLOC 0x0800 135 /* Use reserved root blocks if needed */ 136 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 137 /* Use blocks from reserved pool */ 138 #define EXT4_MB_USE_RESERVED 0x2000 139 140 struct ext4_allocation_request { 141 /* target inode for block we're allocating */ 142 struct inode *inode; 143 /* how many blocks we want to allocate */ 144 unsigned int len; 145 /* logical block in target inode */ 146 ext4_lblk_t logical; 147 /* the closest logical allocated block to the left */ 148 ext4_lblk_t lleft; 149 /* the closest logical allocated block to the right */ 150 ext4_lblk_t lright; 151 /* phys. target (a hint) */ 152 ext4_fsblk_t goal; 153 /* phys. block for the closest logical allocated block to the left */ 154 ext4_fsblk_t pleft; 155 /* phys. block for the closest logical allocated block to the right */ 156 ext4_fsblk_t pright; 157 /* flags. see above EXT4_MB_HINT_* */ 158 unsigned int flags; 159 }; 160 161 /* 162 * Logical to physical block mapping, used by ext4_map_blocks() 163 * 164 * This structure is used to pass requests into ext4_map_blocks() as 165 * well as to store the information returned by ext4_map_blocks(). It 166 * takes less room on the stack than a struct buffer_head. 167 */ 168 #define EXT4_MAP_NEW (1 << BH_New) 169 #define EXT4_MAP_MAPPED (1 << BH_Mapped) 170 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 171 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 172 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 173 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 174 175 struct ext4_map_blocks { 176 ext4_fsblk_t m_pblk; 177 ext4_lblk_t m_lblk; 178 unsigned int m_len; 179 unsigned int m_flags; 180 }; 181 182 /* 183 * Flags for ext4_io_end->flags 184 */ 185 #define EXT4_IO_END_UNWRITTEN 0x0001 186 187 /* 188 * For converting unwritten extents on a work queue. 'handle' is used for 189 * buffered writeback. 190 */ 191 typedef struct ext4_io_end { 192 struct list_head list; /* per-file finished IO list */ 193 handle_t *handle; /* handle reserved for extent 194 * conversion */ 195 struct inode *inode; /* file being written to */ 196 struct bio *bio; /* Linked list of completed 197 * bios covering the extent */ 198 unsigned int flag; /* unwritten or not */ 199 atomic_t count; /* reference counter */ 200 loff_t offset; /* offset in the file */ 201 ssize_t size; /* size of the extent */ 202 } ext4_io_end_t; 203 204 struct ext4_io_submit { 205 struct writeback_control *io_wbc; 206 struct bio *io_bio; 207 ext4_io_end_t *io_end; 208 sector_t io_next_block; 209 }; 210 211 /* 212 * Special inodes numbers 213 */ 214 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 215 #define EXT4_ROOT_INO 2 /* Root inode */ 216 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 217 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 218 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 219 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 220 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 221 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 222 223 /* First non-reserved inode for old ext4 filesystems */ 224 #define EXT4_GOOD_OLD_FIRST_INO 11 225 226 /* 227 * Maximal count of links to a file 228 */ 229 #define EXT4_LINK_MAX 65000 230 231 /* 232 * Macro-instructions used to manage several block sizes 233 */ 234 #define EXT4_MIN_BLOCK_SIZE 1024 235 #define EXT4_MAX_BLOCK_SIZE 65536 236 #define EXT4_MIN_BLOCK_LOG_SIZE 10 237 #define EXT4_MAX_BLOCK_LOG_SIZE 16 238 #ifdef __KERNEL__ 239 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 240 #else 241 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 242 #endif 243 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 244 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 245 EXT4_SB(s)->s_cluster_bits) 246 #ifdef __KERNEL__ 247 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 248 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 249 #else 250 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 251 #endif 252 #ifdef __KERNEL__ 253 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 254 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 255 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 256 #else 257 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 258 EXT4_GOOD_OLD_INODE_SIZE : \ 259 (s)->s_inode_size) 260 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 261 EXT4_GOOD_OLD_FIRST_INO : \ 262 (s)->s_first_ino) 263 #endif 264 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 265 266 /* Translate a block number to a cluster number */ 267 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 268 /* Translate a cluster number to a block number */ 269 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 270 /* Translate # of blks to # of clusters */ 271 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 272 (sbi)->s_cluster_bits) 273 /* Mask out the low bits to get the starting block of the cluster */ 274 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 275 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 276 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 277 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 278 /* Get the cluster offset */ 279 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 280 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 281 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 282 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 283 284 /* 285 * Structure of a blocks group descriptor 286 */ 287 struct ext4_group_desc 288 { 289 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 290 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 291 __le32 bg_inode_table_lo; /* Inodes table block */ 292 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 293 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 294 __le16 bg_used_dirs_count_lo; /* Directories count */ 295 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 296 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 297 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 298 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 299 __le16 bg_itable_unused_lo; /* Unused inodes count */ 300 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 301 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 302 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 303 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 304 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 305 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 306 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 307 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 308 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 309 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 310 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 311 __u32 bg_reserved; 312 }; 313 314 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 315 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 316 sizeof(__le16)) 317 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 318 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 319 sizeof(__le16)) 320 321 /* 322 * Structure of a flex block group info 323 */ 324 325 struct flex_groups { 326 atomic64_t free_clusters; 327 atomic_t free_inodes; 328 atomic_t used_dirs; 329 }; 330 331 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 332 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 333 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 334 335 /* 336 * Macro-instructions used to manage group descriptors 337 */ 338 #define EXT4_MIN_DESC_SIZE 32 339 #define EXT4_MIN_DESC_SIZE_64BIT 64 340 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 341 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 342 #ifdef __KERNEL__ 343 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 344 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 345 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 346 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 347 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 348 #else 349 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 350 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 351 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 352 #endif 353 354 /* 355 * Constants relative to the data blocks 356 */ 357 #define EXT4_NDIR_BLOCKS 12 358 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 359 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 360 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 361 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 362 363 /* 364 * Inode flags 365 */ 366 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 367 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 368 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 369 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 370 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 371 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 372 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 373 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 374 /* Reserved for compression usage... */ 375 #define EXT4_DIRTY_FL 0x00000100 376 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 377 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 378 /* nb: was previously EXT2_ECOMPR_FL */ 379 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 380 /* End compression flags --- maybe not all used */ 381 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 382 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 383 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 384 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 385 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 386 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 387 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 388 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 389 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 390 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 391 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 392 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 393 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 394 395 #define EXT4_FL_USER_VISIBLE 0x304BDFFF /* User visible flags */ 396 #define EXT4_FL_USER_MODIFIABLE 0x204380FF /* User modifiable flags */ 397 398 #define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \ 399 EXT4_IMMUTABLE_FL | \ 400 EXT4_APPEND_FL | \ 401 EXT4_NODUMP_FL | \ 402 EXT4_NOATIME_FL | \ 403 EXT4_PROJINHERIT_FL) 404 405 /* Flags that should be inherited by new inodes from their parent. */ 406 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 407 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 408 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 409 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 410 EXT4_PROJINHERIT_FL) 411 412 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 413 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 414 415 /* Flags that are appropriate for non-directories/regular files. */ 416 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 417 418 /* Mask out flags that are inappropriate for the given type of inode. */ 419 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 420 { 421 if (S_ISDIR(mode)) 422 return flags; 423 else if (S_ISREG(mode)) 424 return flags & EXT4_REG_FLMASK; 425 else 426 return flags & EXT4_OTHER_FLMASK; 427 } 428 429 /* 430 * Inode flags used for atomic set/get 431 */ 432 enum { 433 EXT4_INODE_SECRM = 0, /* Secure deletion */ 434 EXT4_INODE_UNRM = 1, /* Undelete */ 435 EXT4_INODE_COMPR = 2, /* Compress file */ 436 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 437 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 438 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 439 EXT4_INODE_NODUMP = 6, /* do not dump file */ 440 EXT4_INODE_NOATIME = 7, /* do not update atime */ 441 /* Reserved for compression usage... */ 442 EXT4_INODE_DIRTY = 8, 443 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 444 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 445 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 446 /* End compression flags --- maybe not all used */ 447 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 448 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 449 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 450 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 451 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 452 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 453 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 454 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 455 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 456 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 457 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 458 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 459 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 460 }; 461 462 /* 463 * Since it's pretty easy to mix up bit numbers and hex values, we use a 464 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 465 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 466 * any extra space in the compiled kernel image, otherwise, the build will fail. 467 * It's important that these values are the same, since we are using 468 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 469 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 470 * values found in ext2, ext3 and ext4 filesystems, and of course the values 471 * defined in e2fsprogs. 472 * 473 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 474 */ 475 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 476 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 477 478 static inline void ext4_check_flag_values(void) 479 { 480 CHECK_FLAG_VALUE(SECRM); 481 CHECK_FLAG_VALUE(UNRM); 482 CHECK_FLAG_VALUE(COMPR); 483 CHECK_FLAG_VALUE(SYNC); 484 CHECK_FLAG_VALUE(IMMUTABLE); 485 CHECK_FLAG_VALUE(APPEND); 486 CHECK_FLAG_VALUE(NODUMP); 487 CHECK_FLAG_VALUE(NOATIME); 488 CHECK_FLAG_VALUE(DIRTY); 489 CHECK_FLAG_VALUE(COMPRBLK); 490 CHECK_FLAG_VALUE(NOCOMPR); 491 CHECK_FLAG_VALUE(ENCRYPT); 492 CHECK_FLAG_VALUE(INDEX); 493 CHECK_FLAG_VALUE(IMAGIC); 494 CHECK_FLAG_VALUE(JOURNAL_DATA); 495 CHECK_FLAG_VALUE(NOTAIL); 496 CHECK_FLAG_VALUE(DIRSYNC); 497 CHECK_FLAG_VALUE(TOPDIR); 498 CHECK_FLAG_VALUE(HUGE_FILE); 499 CHECK_FLAG_VALUE(EXTENTS); 500 CHECK_FLAG_VALUE(EA_INODE); 501 CHECK_FLAG_VALUE(EOFBLOCKS); 502 CHECK_FLAG_VALUE(INLINE_DATA); 503 CHECK_FLAG_VALUE(PROJINHERIT); 504 CHECK_FLAG_VALUE(RESERVED); 505 } 506 507 /* Used to pass group descriptor data when online resize is done */ 508 struct ext4_new_group_input { 509 __u32 group; /* Group number for this data */ 510 __u64 block_bitmap; /* Absolute block number of block bitmap */ 511 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 512 __u64 inode_table; /* Absolute block number of inode table start */ 513 __u32 blocks_count; /* Total number of blocks in this group */ 514 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 515 __u16 unused; 516 }; 517 518 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 519 struct compat_ext4_new_group_input { 520 u32 group; 521 compat_u64 block_bitmap; 522 compat_u64 inode_bitmap; 523 compat_u64 inode_table; 524 u32 blocks_count; 525 u16 reserved_blocks; 526 u16 unused; 527 }; 528 #endif 529 530 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 531 struct ext4_new_group_data { 532 __u32 group; 533 __u64 block_bitmap; 534 __u64 inode_bitmap; 535 __u64 inode_table; 536 __u32 blocks_count; 537 __u16 reserved_blocks; 538 __u16 unused; 539 __u32 free_blocks_count; 540 }; 541 542 /* Indexes used to index group tables in ext4_new_group_data */ 543 enum { 544 BLOCK_BITMAP = 0, /* block bitmap */ 545 INODE_BITMAP, /* inode bitmap */ 546 INODE_TABLE, /* inode tables */ 547 GROUP_TABLE_COUNT, 548 }; 549 550 /* 551 * Flags used by ext4_map_blocks() 552 */ 553 /* Allocate any needed blocks and/or convert an unwritten 554 extent to be an initialized ext4 */ 555 #define EXT4_GET_BLOCKS_CREATE 0x0001 556 /* Request the creation of an unwritten extent */ 557 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 558 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 559 EXT4_GET_BLOCKS_CREATE) 560 /* Caller is from the delayed allocation writeout path 561 * finally doing the actual allocation of delayed blocks */ 562 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 563 /* caller is from the direct IO path, request to creation of an 564 unwritten extents if not allocated, split the unwritten 565 extent if blocks has been preallocated already*/ 566 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 567 #define EXT4_GET_BLOCKS_CONVERT 0x0010 568 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 569 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 570 /* Convert extent to initialized after IO complete */ 571 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 572 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 573 /* Eventual metadata allocation (due to growing extent tree) 574 * should not fail, so try to use reserved blocks for that.*/ 575 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 576 /* Don't normalize allocation size (used for fallocate) */ 577 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 578 /* Request will not result in inode size update (user for fallocate) */ 579 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 580 /* Convert written extents to unwritten */ 581 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 582 /* Write zeros to newly created written extents */ 583 #define EXT4_GET_BLOCKS_ZERO 0x0200 584 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 585 EXT4_GET_BLOCKS_ZERO) 586 /* Caller will submit data before dropping transaction handle. This 587 * allows jbd2 to avoid submitting data before commit. */ 588 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 589 590 /* 591 * The bit position of these flags must not overlap with any of the 592 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 593 * read_extent_tree_block(), ext4_split_extent_at(), 594 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 595 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 596 * caching the extents when reading from the extent tree while a 597 * truncate or punch hole operation is in progress. 598 */ 599 #define EXT4_EX_NOCACHE 0x40000000 600 #define EXT4_EX_FORCE_CACHE 0x20000000 601 602 /* 603 * Flags used by ext4_free_blocks 604 */ 605 #define EXT4_FREE_BLOCKS_METADATA 0x0001 606 #define EXT4_FREE_BLOCKS_FORGET 0x0002 607 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 608 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 609 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 610 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 611 612 /* 613 * ioctl commands 614 */ 615 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 616 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 617 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 618 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 619 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 620 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 621 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 622 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 623 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 624 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 625 #define EXT4_IOC_MIGRATE _IO('f', 9) 626 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 627 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 628 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 629 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 630 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 631 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 632 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 633 #define EXT4_IOC_SET_ENCRYPTION_POLICY FS_IOC_SET_ENCRYPTION_POLICY 634 #define EXT4_IOC_GET_ENCRYPTION_PWSALT FS_IOC_GET_ENCRYPTION_PWSALT 635 #define EXT4_IOC_GET_ENCRYPTION_POLICY FS_IOC_GET_ENCRYPTION_POLICY 636 637 #ifndef FS_IOC_FSGETXATTR 638 /* Until the uapi changes get merged for project quota... */ 639 640 #define FS_IOC_FSGETXATTR _IOR('X', 31, struct fsxattr) 641 #define FS_IOC_FSSETXATTR _IOW('X', 32, struct fsxattr) 642 643 /* 644 * Structure for FS_IOC_FSGETXATTR and FS_IOC_FSSETXATTR. 645 */ 646 struct fsxattr { 647 __u32 fsx_xflags; /* xflags field value (get/set) */ 648 __u32 fsx_extsize; /* extsize field value (get/set)*/ 649 __u32 fsx_nextents; /* nextents field value (get) */ 650 __u32 fsx_projid; /* project identifier (get/set) */ 651 unsigned char fsx_pad[12]; 652 }; 653 654 /* 655 * Flags for the fsx_xflags field 656 */ 657 #define FS_XFLAG_REALTIME 0x00000001 /* data in realtime volume */ 658 #define FS_XFLAG_PREALLOC 0x00000002 /* preallocated file extents */ 659 #define FS_XFLAG_IMMUTABLE 0x00000008 /* file cannot be modified */ 660 #define FS_XFLAG_APPEND 0x00000010 /* all writes append */ 661 #define FS_XFLAG_SYNC 0x00000020 /* all writes synchronous */ 662 #define FS_XFLAG_NOATIME 0x00000040 /* do not update access time */ 663 #define FS_XFLAG_NODUMP 0x00000080 /* do not include in backups */ 664 #define FS_XFLAG_RTINHERIT 0x00000100 /* create with rt bit set */ 665 #define FS_XFLAG_PROJINHERIT 0x00000200 /* create with parents projid */ 666 #define FS_XFLAG_NOSYMLINKS 0x00000400 /* disallow symlink creation */ 667 #define FS_XFLAG_EXTSIZE 0x00000800 /* extent size allocator hint */ 668 #define FS_XFLAG_EXTSZINHERIT 0x00001000 /* inherit inode extent size */ 669 #define FS_XFLAG_NODEFRAG 0x00002000 /* do not defragment */ 670 #define FS_XFLAG_FILESTREAM 0x00004000 /* use filestream allocator */ 671 #define FS_XFLAG_HASATTR 0x80000000 /* no DIFLAG for this */ 672 #endif /* !defined(FS_IOC_FSGETXATTR) */ 673 674 #define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR 675 #define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR 676 677 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 678 /* 679 * ioctl commands in 32 bit emulation 680 */ 681 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 682 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 683 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 684 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 685 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 686 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 687 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 688 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 689 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 690 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 691 #endif 692 693 /* Max physical block we can address w/o extents */ 694 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 695 696 /* 697 * Structure of an inode on the disk 698 */ 699 struct ext4_inode { 700 __le16 i_mode; /* File mode */ 701 __le16 i_uid; /* Low 16 bits of Owner Uid */ 702 __le32 i_size_lo; /* Size in bytes */ 703 __le32 i_atime; /* Access time */ 704 __le32 i_ctime; /* Inode Change time */ 705 __le32 i_mtime; /* Modification time */ 706 __le32 i_dtime; /* Deletion Time */ 707 __le16 i_gid; /* Low 16 bits of Group Id */ 708 __le16 i_links_count; /* Links count */ 709 __le32 i_blocks_lo; /* Blocks count */ 710 __le32 i_flags; /* File flags */ 711 union { 712 struct { 713 __le32 l_i_version; 714 } linux1; 715 struct { 716 __u32 h_i_translator; 717 } hurd1; 718 struct { 719 __u32 m_i_reserved1; 720 } masix1; 721 } osd1; /* OS dependent 1 */ 722 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 723 __le32 i_generation; /* File version (for NFS) */ 724 __le32 i_file_acl_lo; /* File ACL */ 725 __le32 i_size_high; 726 __le32 i_obso_faddr; /* Obsoleted fragment address */ 727 union { 728 struct { 729 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 730 __le16 l_i_file_acl_high; 731 __le16 l_i_uid_high; /* these 2 fields */ 732 __le16 l_i_gid_high; /* were reserved2[0] */ 733 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 734 __le16 l_i_reserved; 735 } linux2; 736 struct { 737 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 738 __u16 h_i_mode_high; 739 __u16 h_i_uid_high; 740 __u16 h_i_gid_high; 741 __u32 h_i_author; 742 } hurd2; 743 struct { 744 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 745 __le16 m_i_file_acl_high; 746 __u32 m_i_reserved2[2]; 747 } masix2; 748 } osd2; /* OS dependent 2 */ 749 __le16 i_extra_isize; 750 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 751 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 752 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 753 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 754 __le32 i_crtime; /* File Creation time */ 755 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 756 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 757 __le32 i_projid; /* Project ID */ 758 }; 759 760 struct move_extent { 761 __u32 reserved; /* should be zero */ 762 __u32 donor_fd; /* donor file descriptor */ 763 __u64 orig_start; /* logical start offset in block for orig */ 764 __u64 donor_start; /* logical start offset in block for donor */ 765 __u64 len; /* block length to be moved */ 766 __u64 moved_len; /* moved block length */ 767 }; 768 769 #define EXT4_EPOCH_BITS 2 770 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 771 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 772 773 /* 774 * Extended fields will fit into an inode if the filesystem was formatted 775 * with large inodes (-I 256 or larger) and there are not currently any EAs 776 * consuming all of the available space. For new inodes we always reserve 777 * enough space for the kernel's known extended fields, but for inodes 778 * created with an old kernel this might not have been the case. None of 779 * the extended inode fields is critical for correct filesystem operation. 780 * This macro checks if a certain field fits in the inode. Note that 781 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 782 */ 783 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 784 ((offsetof(typeof(*ext4_inode), field) + \ 785 sizeof((ext4_inode)->field)) \ 786 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 787 (einode)->i_extra_isize)) \ 788 789 /* 790 * We use an encoding that preserves the times for extra epoch "00": 791 * 792 * extra msb of adjust for signed 793 * epoch 32-bit 32-bit tv_sec to 794 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 795 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 796 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 797 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 798 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 799 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 800 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 801 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 802 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 803 * 804 * Note that previous versions of the kernel on 64-bit systems would 805 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 806 * 1970. e2fsck will correct this, assuming that it is run on the 807 * affected filesystem before 2242. 808 */ 809 810 static inline __le32 ext4_encode_extra_time(struct timespec *time) 811 { 812 u32 extra = sizeof(time->tv_sec) > 4 ? 813 ((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK : 0; 814 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); 815 } 816 817 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 818 { 819 if (unlikely(sizeof(time->tv_sec) > 4 && 820 (extra & cpu_to_le32(EXT4_EPOCH_MASK)))) { 821 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,20,0) 822 /* Handle legacy encoding of pre-1970 dates with epoch 823 * bits 1,1. We assume that by kernel version 4.20, 824 * everyone will have run fsck over the affected 825 * filesystems to correct the problem. (This 826 * backwards compatibility may be removed before this 827 * time, at the discretion of the ext4 developers.) 828 */ 829 u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK; 830 if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0) 831 extra_bits = 0; 832 time->tv_sec += extra_bits << 32; 833 #else 834 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 835 #endif 836 } 837 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 838 } 839 840 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 841 do { \ 842 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 843 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 844 (raw_inode)->xtime ## _extra = \ 845 ext4_encode_extra_time(&(inode)->xtime); \ 846 } while (0) 847 848 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 849 do { \ 850 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 851 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 852 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 853 (raw_inode)->xtime ## _extra = \ 854 ext4_encode_extra_time(&(einode)->xtime); \ 855 } while (0) 856 857 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 858 do { \ 859 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 860 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 861 ext4_decode_extra_time(&(inode)->xtime, \ 862 raw_inode->xtime ## _extra); \ 863 else \ 864 (inode)->xtime.tv_nsec = 0; \ 865 } while (0) 866 867 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 868 do { \ 869 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 870 (einode)->xtime.tv_sec = \ 871 (signed)le32_to_cpu((raw_inode)->xtime); \ 872 else \ 873 (einode)->xtime.tv_sec = 0; \ 874 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 875 ext4_decode_extra_time(&(einode)->xtime, \ 876 raw_inode->xtime ## _extra); \ 877 else \ 878 (einode)->xtime.tv_nsec = 0; \ 879 } while (0) 880 881 #define i_disk_version osd1.linux1.l_i_version 882 883 #if defined(__KERNEL__) || defined(__linux__) 884 #define i_reserved1 osd1.linux1.l_i_reserved1 885 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 886 #define i_blocks_high osd2.linux2.l_i_blocks_high 887 #define i_uid_low i_uid 888 #define i_gid_low i_gid 889 #define i_uid_high osd2.linux2.l_i_uid_high 890 #define i_gid_high osd2.linux2.l_i_gid_high 891 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 892 893 #elif defined(__GNU__) 894 895 #define i_translator osd1.hurd1.h_i_translator 896 #define i_uid_high osd2.hurd2.h_i_uid_high 897 #define i_gid_high osd2.hurd2.h_i_gid_high 898 #define i_author osd2.hurd2.h_i_author 899 900 #elif defined(__masix__) 901 902 #define i_reserved1 osd1.masix1.m_i_reserved1 903 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 904 #define i_reserved2 osd2.masix2.m_i_reserved2 905 906 #endif /* defined(__KERNEL__) || defined(__linux__) */ 907 908 #include "extents_status.h" 909 910 /* 911 * Lock subclasses for i_data_sem in the ext4_inode_info structure. 912 * 913 * These are needed to avoid lockdep false positives when we need to 914 * allocate blocks to the quota inode during ext4_map_blocks(), while 915 * holding i_data_sem for a normal (non-quota) inode. Since we don't 916 * do quota tracking for the quota inode, this avoids deadlock (as 917 * well as infinite recursion, since it isn't turtles all the way 918 * down...) 919 * 920 * I_DATA_SEM_NORMAL - Used for most inodes 921 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode 922 * where the second inode has larger inode number 923 * than the first 924 * I_DATA_SEM_QUOTA - Used for quota inodes only 925 */ 926 enum { 927 I_DATA_SEM_NORMAL = 0, 928 I_DATA_SEM_OTHER, 929 I_DATA_SEM_QUOTA, 930 }; 931 932 933 /* 934 * fourth extended file system inode data in memory 935 */ 936 struct ext4_inode_info { 937 __le32 i_data[15]; /* unconverted */ 938 __u32 i_dtime; 939 ext4_fsblk_t i_file_acl; 940 941 /* 942 * i_block_group is the number of the block group which contains 943 * this file's inode. Constant across the lifetime of the inode, 944 * it is ued for making block allocation decisions - we try to 945 * place a file's data blocks near its inode block, and new inodes 946 * near to their parent directory's inode. 947 */ 948 ext4_group_t i_block_group; 949 ext4_lblk_t i_dir_start_lookup; 950 #if (BITS_PER_LONG < 64) 951 unsigned long i_state_flags; /* Dynamic state flags */ 952 #endif 953 unsigned long i_flags; 954 955 /* 956 * Extended attributes can be read independently of the main file 957 * data. Taking i_mutex even when reading would cause contention 958 * between readers of EAs and writers of regular file data, so 959 * instead we synchronize on xattr_sem when reading or changing 960 * EAs. 961 */ 962 struct rw_semaphore xattr_sem; 963 964 struct list_head i_orphan; /* unlinked but open inodes */ 965 966 /* 967 * i_disksize keeps track of what the inode size is ON DISK, not 968 * in memory. During truncate, i_size is set to the new size by 969 * the VFS prior to calling ext4_truncate(), but the filesystem won't 970 * set i_disksize to 0 until the truncate is actually under way. 971 * 972 * The intent is that i_disksize always represents the blocks which 973 * are used by this file. This allows recovery to restart truncate 974 * on orphans if we crash during truncate. We actually write i_disksize 975 * into the on-disk inode when writing inodes out, instead of i_size. 976 * 977 * The only time when i_disksize and i_size may be different is when 978 * a truncate is in progress. The only things which change i_disksize 979 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 980 */ 981 loff_t i_disksize; 982 983 /* 984 * i_data_sem is for serialising ext4_truncate() against 985 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 986 * data tree are chopped off during truncate. We can't do that in 987 * ext4 because whenever we perform intermediate commits during 988 * truncate, the inode and all the metadata blocks *must* be in a 989 * consistent state which allows truncation of the orphans to restart 990 * during recovery. Hence we must fix the get_block-vs-truncate race 991 * by other means, so we have i_data_sem. 992 */ 993 struct rw_semaphore i_data_sem; 994 /* 995 * i_mmap_sem is for serializing page faults with truncate / punch hole 996 * operations. We have to make sure that new page cannot be faulted in 997 * a section of the inode that is being punched. We cannot easily use 998 * i_data_sem for this since we need protection for the whole punch 999 * operation and i_data_sem ranks below transaction start so we have 1000 * to occasionally drop it. 1001 */ 1002 struct rw_semaphore i_mmap_sem; 1003 struct inode vfs_inode; 1004 struct jbd2_inode *jinode; 1005 1006 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 1007 1008 /* 1009 * File creation time. Its function is same as that of 1010 * struct timespec i_{a,c,m}time in the generic inode. 1011 */ 1012 struct timespec i_crtime; 1013 1014 /* mballoc */ 1015 struct list_head i_prealloc_list; 1016 spinlock_t i_prealloc_lock; 1017 1018 /* extents status tree */ 1019 struct ext4_es_tree i_es_tree; 1020 rwlock_t i_es_lock; 1021 struct list_head i_es_list; 1022 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1023 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1024 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1025 extents to shrink. Protected by 1026 i_es_lock */ 1027 1028 /* ialloc */ 1029 ext4_group_t i_last_alloc_group; 1030 1031 /* allocation reservation info for delalloc */ 1032 /* In case of bigalloc, these refer to clusters rather than blocks */ 1033 unsigned int i_reserved_data_blocks; 1034 unsigned int i_reserved_meta_blocks; 1035 unsigned int i_allocated_meta_blocks; 1036 ext4_lblk_t i_da_metadata_calc_last_lblock; 1037 int i_da_metadata_calc_len; 1038 1039 /* on-disk additional length */ 1040 __u16 i_extra_isize; 1041 1042 /* Indicate the inline data space. */ 1043 u16 i_inline_off; 1044 u16 i_inline_size; 1045 1046 #ifdef CONFIG_QUOTA 1047 /* quota space reservation, managed internally by quota code */ 1048 qsize_t i_reserved_quota; 1049 #endif 1050 1051 /* Lock protecting lists below */ 1052 spinlock_t i_completed_io_lock; 1053 /* 1054 * Completed IOs that need unwritten extents handling and have 1055 * transaction reserved 1056 */ 1057 struct list_head i_rsv_conversion_list; 1058 struct work_struct i_rsv_conversion_work; 1059 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 1060 1061 spinlock_t i_block_reservation_lock; 1062 1063 /* 1064 * Transactions that contain inode's metadata needed to complete 1065 * fsync and fdatasync, respectively. 1066 */ 1067 tid_t i_sync_tid; 1068 tid_t i_datasync_tid; 1069 1070 #ifdef CONFIG_QUOTA 1071 struct dquot *i_dquot[MAXQUOTAS]; 1072 #endif 1073 1074 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1075 __u32 i_csum_seed; 1076 1077 kprojid_t i_projid; 1078 }; 1079 1080 /* 1081 * File system states 1082 */ 1083 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1084 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1085 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1086 1087 /* 1088 * Misc. filesystem flags 1089 */ 1090 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1091 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1092 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1093 1094 /* 1095 * Mount flags set via mount options or defaults 1096 */ 1097 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1098 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1099 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1100 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1101 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1102 #define EXT4_MOUNT_ERRORS_MASK 0x00070 1103 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1104 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1105 #ifdef CONFIG_FS_DAX 1106 #define EXT4_MOUNT_DAX 0x00200 /* Direct Access */ 1107 #else 1108 #define EXT4_MOUNT_DAX 0 1109 #endif 1110 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1111 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1112 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1113 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1114 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1115 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1116 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1117 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1118 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1119 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1120 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 1121 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 1122 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 1123 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1124 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1125 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1126 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1127 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1128 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1129 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1130 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1131 1132 /* 1133 * Mount flags set either automatically (could not be set by mount option) 1134 * based on per file system feature or property or in special cases such as 1135 * distinguishing between explicit mount option definition and default. 1136 */ 1137 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1138 specified delalloc */ 1139 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1140 size of blocksize * 8 1141 blocks */ 1142 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1143 file systems */ 1144 1145 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1146 specified journal checksum */ 1147 1148 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1149 ~EXT4_MOUNT_##opt 1150 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1151 EXT4_MOUNT_##opt 1152 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1153 EXT4_MOUNT_##opt) 1154 1155 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1156 ~EXT4_MOUNT2_##opt 1157 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1158 EXT4_MOUNT2_##opt 1159 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1160 EXT4_MOUNT2_##opt) 1161 1162 #define ext4_test_and_set_bit __test_and_set_bit_le 1163 #define ext4_set_bit __set_bit_le 1164 #define ext4_set_bit_atomic ext2_set_bit_atomic 1165 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1166 #define ext4_clear_bit __clear_bit_le 1167 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1168 #define ext4_test_bit test_bit_le 1169 #define ext4_find_next_zero_bit find_next_zero_bit_le 1170 #define ext4_find_next_bit find_next_bit_le 1171 1172 extern void ext4_set_bits(void *bm, int cur, int len); 1173 1174 /* 1175 * Maximal mount counts between two filesystem checks 1176 */ 1177 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1178 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1179 1180 /* 1181 * Behaviour when detecting errors 1182 */ 1183 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1184 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1185 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1186 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1187 1188 /* Metadata checksum algorithm codes */ 1189 #define EXT4_CRC32C_CHKSUM 1 1190 1191 /* 1192 * Structure of the super block 1193 */ 1194 struct ext4_super_block { 1195 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1196 __le32 s_blocks_count_lo; /* Blocks count */ 1197 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1198 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1199 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1200 __le32 s_first_data_block; /* First Data Block */ 1201 __le32 s_log_block_size; /* Block size */ 1202 __le32 s_log_cluster_size; /* Allocation cluster size */ 1203 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1204 __le32 s_clusters_per_group; /* # Clusters per group */ 1205 __le32 s_inodes_per_group; /* # Inodes per group */ 1206 __le32 s_mtime; /* Mount time */ 1207 /*30*/ __le32 s_wtime; /* Write time */ 1208 __le16 s_mnt_count; /* Mount count */ 1209 __le16 s_max_mnt_count; /* Maximal mount count */ 1210 __le16 s_magic; /* Magic signature */ 1211 __le16 s_state; /* File system state */ 1212 __le16 s_errors; /* Behaviour when detecting errors */ 1213 __le16 s_minor_rev_level; /* minor revision level */ 1214 /*40*/ __le32 s_lastcheck; /* time of last check */ 1215 __le32 s_checkinterval; /* max. time between checks */ 1216 __le32 s_creator_os; /* OS */ 1217 __le32 s_rev_level; /* Revision level */ 1218 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1219 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1220 /* 1221 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1222 * 1223 * Note: the difference between the compatible feature set and 1224 * the incompatible feature set is that if there is a bit set 1225 * in the incompatible feature set that the kernel doesn't 1226 * know about, it should refuse to mount the filesystem. 1227 * 1228 * e2fsck's requirements are more strict; if it doesn't know 1229 * about a feature in either the compatible or incompatible 1230 * feature set, it must abort and not try to meddle with 1231 * things it doesn't understand... 1232 */ 1233 __le32 s_first_ino; /* First non-reserved inode */ 1234 __le16 s_inode_size; /* size of inode structure */ 1235 __le16 s_block_group_nr; /* block group # of this superblock */ 1236 __le32 s_feature_compat; /* compatible feature set */ 1237 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1238 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1239 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1240 /*78*/ char s_volume_name[16]; /* volume name */ 1241 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 1242 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1243 /* 1244 * Performance hints. Directory preallocation should only 1245 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1246 */ 1247 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1248 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1249 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1250 /* 1251 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1252 */ 1253 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1254 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1255 __le32 s_journal_dev; /* device number of journal file */ 1256 __le32 s_last_orphan; /* start of list of inodes to delete */ 1257 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1258 __u8 s_def_hash_version; /* Default hash version to use */ 1259 __u8 s_jnl_backup_type; 1260 __le16 s_desc_size; /* size of group descriptor */ 1261 /*100*/ __le32 s_default_mount_opts; 1262 __le32 s_first_meta_bg; /* First metablock block group */ 1263 __le32 s_mkfs_time; /* When the filesystem was created */ 1264 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1265 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1266 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1267 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1268 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1269 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1270 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1271 __le32 s_flags; /* Miscellaneous flags */ 1272 __le16 s_raid_stride; /* RAID stride */ 1273 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1274 __le64 s_mmp_block; /* Block for multi-mount protection */ 1275 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1276 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1277 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1278 __u8 s_encryption_level; /* versioning level for encryption */ 1279 __u8 s_reserved_pad; /* Padding to next 32bits */ 1280 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1281 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1282 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1283 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1284 snapshot's future use */ 1285 __le32 s_snapshot_list; /* inode number of the head of the 1286 on-disk snapshot list */ 1287 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1288 __le32 s_error_count; /* number of fs errors */ 1289 __le32 s_first_error_time; /* first time an error happened */ 1290 __le32 s_first_error_ino; /* inode involved in first error */ 1291 __le64 s_first_error_block; /* block involved of first error */ 1292 __u8 s_first_error_func[32]; /* function where the error happened */ 1293 __le32 s_first_error_line; /* line number where error happened */ 1294 __le32 s_last_error_time; /* most recent time of an error */ 1295 __le32 s_last_error_ino; /* inode involved in last error */ 1296 __le32 s_last_error_line; /* line number where error happened */ 1297 __le64 s_last_error_block; /* block involved of last error */ 1298 __u8 s_last_error_func[32]; /* function where the error happened */ 1299 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1300 __u8 s_mount_opts[64]; 1301 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1302 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1303 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1304 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1305 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1306 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1307 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1308 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1309 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1310 __le32 s_reserved[98]; /* Padding to the end of the block */ 1311 __le32 s_checksum; /* crc32c(superblock) */ 1312 }; 1313 1314 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1315 1316 #ifdef __KERNEL__ 1317 1318 /* 1319 * run-time mount flags 1320 */ 1321 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1322 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1323 #define EXT4_MF_TEST_DUMMY_ENCRYPTION 0x0004 1324 1325 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1326 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \ 1327 EXT4_MF_TEST_DUMMY_ENCRYPTION)) 1328 #else 1329 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0) 1330 #endif 1331 1332 /* Number of quota types we support */ 1333 #define EXT4_MAXQUOTAS 3 1334 1335 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1336 #define EXT4_KEY_DESC_PREFIX "ext4:" 1337 #define EXT4_KEY_DESC_PREFIX_SIZE 5 1338 #endif 1339 1340 /* 1341 * fourth extended-fs super-block data in memory 1342 */ 1343 struct ext4_sb_info { 1344 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1345 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1346 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1347 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1348 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1349 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1350 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1351 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1352 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1353 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1354 unsigned long s_overhead; /* # of fs overhead clusters */ 1355 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1356 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1357 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1358 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1359 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1360 struct buffer_head **s_group_desc; 1361 unsigned int s_mount_opt; 1362 unsigned int s_mount_opt2; 1363 unsigned int s_mount_flags; 1364 unsigned int s_def_mount_opt; 1365 ext4_fsblk_t s_sb_block; 1366 atomic64_t s_resv_clusters; 1367 kuid_t s_resuid; 1368 kgid_t s_resgid; 1369 unsigned short s_mount_state; 1370 unsigned short s_pad; 1371 int s_addr_per_block_bits; 1372 int s_desc_per_block_bits; 1373 int s_inode_size; 1374 int s_first_ino; 1375 unsigned int s_inode_readahead_blks; 1376 unsigned int s_inode_goal; 1377 spinlock_t s_next_gen_lock; 1378 u32 s_next_generation; 1379 u32 s_hash_seed[4]; 1380 int s_def_hash_version; 1381 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1382 struct percpu_counter s_freeclusters_counter; 1383 struct percpu_counter s_freeinodes_counter; 1384 struct percpu_counter s_dirs_counter; 1385 struct percpu_counter s_dirtyclusters_counter; 1386 struct blockgroup_lock *s_blockgroup_lock; 1387 struct proc_dir_entry *s_proc; 1388 struct kobject s_kobj; 1389 struct completion s_kobj_unregister; 1390 struct super_block *s_sb; 1391 1392 /* Journaling */ 1393 struct journal_s *s_journal; 1394 struct list_head s_orphan; 1395 struct mutex s_orphan_lock; 1396 unsigned long s_resize_flags; /* Flags indicating if there 1397 is a resizer */ 1398 unsigned long s_commit_interval; 1399 u32 s_max_batch_time; 1400 u32 s_min_batch_time; 1401 struct block_device *journal_bdev; 1402 #ifdef CONFIG_QUOTA 1403 char *s_qf_names[EXT4_MAXQUOTAS]; /* Names of quota files with journalled quota */ 1404 int s_jquota_fmt; /* Format of quota to use */ 1405 #endif 1406 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1407 struct rb_root system_blks; 1408 1409 #ifdef EXTENTS_STATS 1410 /* ext4 extents stats */ 1411 unsigned long s_ext_min; 1412 unsigned long s_ext_max; 1413 unsigned long s_depth_max; 1414 spinlock_t s_ext_stats_lock; 1415 unsigned long s_ext_blocks; 1416 unsigned long s_ext_extents; 1417 #endif 1418 1419 /* for buddy allocator */ 1420 struct ext4_group_info ***s_group_info; 1421 struct inode *s_buddy_cache; 1422 spinlock_t s_md_lock; 1423 unsigned short *s_mb_offsets; 1424 unsigned int *s_mb_maxs; 1425 unsigned int s_group_info_size; 1426 unsigned int s_mb_free_pending; 1427 1428 /* tunables */ 1429 unsigned long s_stripe; 1430 unsigned int s_mb_stream_request; 1431 unsigned int s_mb_max_to_scan; 1432 unsigned int s_mb_min_to_scan; 1433 unsigned int s_mb_stats; 1434 unsigned int s_mb_order2_reqs; 1435 unsigned int s_mb_group_prealloc; 1436 unsigned int s_max_dir_size_kb; 1437 /* where last allocation was done - for stream allocation */ 1438 unsigned long s_mb_last_group; 1439 unsigned long s_mb_last_start; 1440 1441 /* stats for buddy allocator */ 1442 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1443 atomic_t s_bal_success; /* we found long enough chunks */ 1444 atomic_t s_bal_allocated; /* in blocks */ 1445 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1446 atomic_t s_bal_goals; /* goal hits */ 1447 atomic_t s_bal_breaks; /* too long searches */ 1448 atomic_t s_bal_2orders; /* 2^order hits */ 1449 spinlock_t s_bal_lock; 1450 unsigned long s_mb_buddies_generated; 1451 unsigned long long s_mb_generation_time; 1452 atomic_t s_mb_lost_chunks; 1453 atomic_t s_mb_preallocated; 1454 atomic_t s_mb_discarded; 1455 atomic_t s_lock_busy; 1456 1457 /* locality groups */ 1458 struct ext4_locality_group __percpu *s_locality_groups; 1459 1460 /* for write statistics */ 1461 unsigned long s_sectors_written_start; 1462 u64 s_kbytes_written; 1463 1464 /* the size of zero-out chunk */ 1465 unsigned int s_extent_max_zeroout_kb; 1466 1467 unsigned int s_log_groups_per_flex; 1468 struct flex_groups *s_flex_groups; 1469 ext4_group_t s_flex_groups_allocated; 1470 1471 /* workqueue for reserved extent conversions (buffered io) */ 1472 struct workqueue_struct *rsv_conversion_wq; 1473 1474 /* timer for periodic error stats printing */ 1475 struct timer_list s_err_report; 1476 1477 /* Lazy inode table initialization info */ 1478 struct ext4_li_request *s_li_request; 1479 /* Wait multiplier for lazy initialization thread */ 1480 unsigned int s_li_wait_mult; 1481 1482 /* Kernel thread for multiple mount protection */ 1483 struct task_struct *s_mmp_tsk; 1484 1485 /* record the last minlen when FITRIM is called. */ 1486 atomic_t s_last_trim_minblks; 1487 1488 /* Reference to checksum algorithm driver via cryptoapi */ 1489 struct crypto_shash *s_chksum_driver; 1490 1491 /* Precomputed FS UUID checksum for seeding other checksums */ 1492 __u32 s_csum_seed; 1493 1494 /* Reclaim extents from extent status tree */ 1495 struct shrinker s_es_shrinker; 1496 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1497 long s_es_nr_inode; 1498 struct ext4_es_stats s_es_stats; 1499 struct mb_cache *s_mb_cache; 1500 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1501 1502 /* Ratelimit ext4 messages. */ 1503 struct ratelimit_state s_err_ratelimit_state; 1504 struct ratelimit_state s_warning_ratelimit_state; 1505 struct ratelimit_state s_msg_ratelimit_state; 1506 1507 /* Barrier between changing inodes' journal flags and writepages ops. */ 1508 struct percpu_rw_semaphore s_journal_flag_rwsem; 1509 1510 /* Encryption support */ 1511 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1512 u8 key_prefix[EXT4_KEY_DESC_PREFIX_SIZE]; 1513 u8 key_prefix_size; 1514 #endif 1515 }; 1516 1517 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1518 { 1519 return sb->s_fs_info; 1520 } 1521 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1522 { 1523 return container_of(inode, struct ext4_inode_info, vfs_inode); 1524 } 1525 1526 static inline struct timespec ext4_current_time(struct inode *inode) 1527 { 1528 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1529 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1530 } 1531 1532 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1533 { 1534 return ino == EXT4_ROOT_INO || 1535 ino == EXT4_USR_QUOTA_INO || 1536 ino == EXT4_GRP_QUOTA_INO || 1537 ino == EXT4_BOOT_LOADER_INO || 1538 ino == EXT4_JOURNAL_INO || 1539 ino == EXT4_RESIZE_INO || 1540 (ino >= EXT4_FIRST_INO(sb) && 1541 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1542 } 1543 1544 /* 1545 * Inode dynamic state flags 1546 */ 1547 enum { 1548 EXT4_STATE_JDATA, /* journaled data exists */ 1549 EXT4_STATE_NEW, /* inode is newly created */ 1550 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1551 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1552 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1553 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1554 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1555 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1556 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read 1557 nolocking */ 1558 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1559 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1560 }; 1561 1562 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1563 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1564 { \ 1565 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1566 } \ 1567 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1568 { \ 1569 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1570 } \ 1571 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1572 { \ 1573 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1574 } 1575 1576 /* Add these declarations here only so that these functions can be 1577 * found by name. Otherwise, they are very hard to locate. */ 1578 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1579 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1580 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1581 EXT4_INODE_BIT_FNS(flag, flags, 0) 1582 1583 /* Add these declarations here only so that these functions can be 1584 * found by name. Otherwise, they are very hard to locate. */ 1585 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1586 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1587 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1588 #if (BITS_PER_LONG < 64) 1589 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1590 1591 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1592 { 1593 (ei)->i_state_flags = 0; 1594 } 1595 #else 1596 EXT4_INODE_BIT_FNS(state, flags, 32) 1597 1598 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1599 { 1600 /* We depend on the fact that callers will set i_flags */ 1601 } 1602 #endif 1603 #else 1604 /* Assume that user mode programs are passing in an ext4fs superblock, not 1605 * a kernel struct super_block. This will allow us to call the feature-test 1606 * macros from user land. */ 1607 #define EXT4_SB(sb) (sb) 1608 #endif 1609 1610 /* 1611 * Returns true if the inode is inode is encrypted 1612 */ 1613 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1614 1615 /* 1616 * Codes for operating systems 1617 */ 1618 #define EXT4_OS_LINUX 0 1619 #define EXT4_OS_HURD 1 1620 #define EXT4_OS_MASIX 2 1621 #define EXT4_OS_FREEBSD 3 1622 #define EXT4_OS_LITES 4 1623 1624 /* 1625 * Revision levels 1626 */ 1627 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1628 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1629 1630 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1631 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1632 1633 #define EXT4_GOOD_OLD_INODE_SIZE 128 1634 1635 /* 1636 * Feature set definitions 1637 */ 1638 1639 /* Use the ext4_{has,set,clear}_feature_* helpers; these will be removed */ 1640 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1641 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1642 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1643 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1644 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1645 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1646 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1647 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1648 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1649 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1650 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1651 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1652 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1653 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1654 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1655 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1656 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1657 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1658 1659 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1660 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1661 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1662 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1663 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1664 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1665 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1666 1667 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1668 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1669 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1670 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1671 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1672 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1673 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1674 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1675 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1676 /* 1677 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1678 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1679 * all other data structures' checksums. However, the METADATA_CSUM and 1680 * GDT_CSUM bits are mutually exclusive. 1681 */ 1682 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1683 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1684 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 1685 1686 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1687 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1688 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1689 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1690 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1691 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1692 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1693 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1694 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1695 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1696 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1697 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 1698 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1699 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1700 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1701 1702 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 1703 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1704 { \ 1705 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1706 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 1707 } \ 1708 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1709 { \ 1710 EXT4_SB(sb)->s_es->s_feature_compat |= \ 1711 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1712 } \ 1713 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1714 { \ 1715 EXT4_SB(sb)->s_es->s_feature_compat &= \ 1716 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1717 } 1718 1719 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 1720 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1721 { \ 1722 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1723 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 1724 } \ 1725 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1726 { \ 1727 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 1728 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1729 } \ 1730 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1731 { \ 1732 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 1733 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1734 } 1735 1736 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 1737 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1738 { \ 1739 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1740 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 1741 } \ 1742 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1743 { \ 1744 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 1745 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1746 } \ 1747 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1748 { \ 1749 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 1750 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1751 } 1752 1753 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 1754 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 1755 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 1756 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 1757 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 1758 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 1759 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 1760 1761 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 1762 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 1763 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 1764 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 1765 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 1766 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 1767 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 1768 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 1769 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 1770 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 1771 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 1772 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 1773 1774 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 1775 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 1776 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 1777 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 1778 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 1779 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 1780 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 1781 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 1782 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 1783 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 1784 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 1785 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 1786 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 1787 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 1788 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 1789 1790 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1791 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1792 EXT4_FEATURE_INCOMPAT_META_BG) 1793 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1794 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1795 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1796 1797 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1798 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1799 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1800 EXT4_FEATURE_INCOMPAT_META_BG) 1801 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1802 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1803 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1804 1805 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1806 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1807 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1808 EXT4_FEATURE_INCOMPAT_META_BG| \ 1809 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1810 EXT4_FEATURE_INCOMPAT_64BIT| \ 1811 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1812 EXT4_FEATURE_INCOMPAT_MMP | \ 1813 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 1814 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 1815 EXT4_FEATURE_INCOMPAT_CSUM_SEED) 1816 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1817 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1818 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1819 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1820 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1821 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1822 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1823 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1824 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1825 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 1826 EXT4_FEATURE_RO_COMPAT_PROJECT) 1827 1828 #define EXTN_FEATURE_FUNCS(ver) \ 1829 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 1830 { \ 1831 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1832 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 1833 } \ 1834 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 1835 { \ 1836 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1837 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 1838 } \ 1839 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 1840 { \ 1841 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1842 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 1843 } 1844 1845 EXTN_FEATURE_FUNCS(2) 1846 EXTN_FEATURE_FUNCS(3) 1847 EXTN_FEATURE_FUNCS(4) 1848 1849 static inline bool ext4_has_compat_features(struct super_block *sb) 1850 { 1851 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 1852 } 1853 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 1854 { 1855 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 1856 } 1857 static inline bool ext4_has_incompat_features(struct super_block *sb) 1858 { 1859 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 1860 } 1861 1862 /* 1863 * Default values for user and/or group using reserved blocks 1864 */ 1865 #define EXT4_DEF_RESUID 0 1866 #define EXT4_DEF_RESGID 0 1867 1868 /* 1869 * Default project ID 1870 */ 1871 #define EXT4_DEF_PROJID 0 1872 1873 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1874 1875 /* 1876 * Default mount options 1877 */ 1878 #define EXT4_DEFM_DEBUG 0x0001 1879 #define EXT4_DEFM_BSDGROUPS 0x0002 1880 #define EXT4_DEFM_XATTR_USER 0x0004 1881 #define EXT4_DEFM_ACL 0x0008 1882 #define EXT4_DEFM_UID16 0x0010 1883 #define EXT4_DEFM_JMODE 0x0060 1884 #define EXT4_DEFM_JMODE_DATA 0x0020 1885 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1886 #define EXT4_DEFM_JMODE_WBACK 0x0060 1887 #define EXT4_DEFM_NOBARRIER 0x0100 1888 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1889 #define EXT4_DEFM_DISCARD 0x0400 1890 #define EXT4_DEFM_NODELALLOC 0x0800 1891 1892 /* 1893 * Default journal batch times 1894 */ 1895 #define EXT4_DEF_MIN_BATCH_TIME 0 1896 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1897 1898 /* 1899 * Minimum number of groups in a flexgroup before we separate out 1900 * directories into the first block group of a flexgroup 1901 */ 1902 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1903 1904 /* 1905 * Structure of a directory entry 1906 */ 1907 #define EXT4_NAME_LEN 255 1908 1909 struct ext4_dir_entry { 1910 __le32 inode; /* Inode number */ 1911 __le16 rec_len; /* Directory entry length */ 1912 __le16 name_len; /* Name length */ 1913 char name[EXT4_NAME_LEN]; /* File name */ 1914 }; 1915 1916 /* 1917 * The new version of the directory entry. Since EXT4 structures are 1918 * stored in intel byte order, and the name_len field could never be 1919 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1920 * file_type field. 1921 */ 1922 struct ext4_dir_entry_2 { 1923 __le32 inode; /* Inode number */ 1924 __le16 rec_len; /* Directory entry length */ 1925 __u8 name_len; /* Name length */ 1926 __u8 file_type; 1927 char name[EXT4_NAME_LEN]; /* File name */ 1928 }; 1929 1930 /* 1931 * This is a bogus directory entry at the end of each leaf block that 1932 * records checksums. 1933 */ 1934 struct ext4_dir_entry_tail { 1935 __le32 det_reserved_zero1; /* Pretend to be unused */ 1936 __le16 det_rec_len; /* 12 */ 1937 __u8 det_reserved_zero2; /* Zero name length */ 1938 __u8 det_reserved_ft; /* 0xDE, fake file type */ 1939 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1940 }; 1941 1942 #define EXT4_DIRENT_TAIL(block, blocksize) \ 1943 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 1944 ((blocksize) - \ 1945 sizeof(struct ext4_dir_entry_tail)))) 1946 1947 /* 1948 * Ext4 directory file types. Only the low 3 bits are used. The 1949 * other bits are reserved for now. 1950 */ 1951 #define EXT4_FT_UNKNOWN 0 1952 #define EXT4_FT_REG_FILE 1 1953 #define EXT4_FT_DIR 2 1954 #define EXT4_FT_CHRDEV 3 1955 #define EXT4_FT_BLKDEV 4 1956 #define EXT4_FT_FIFO 5 1957 #define EXT4_FT_SOCK 6 1958 #define EXT4_FT_SYMLINK 7 1959 1960 #define EXT4_FT_MAX 8 1961 1962 #define EXT4_FT_DIR_CSUM 0xDE 1963 1964 /* 1965 * EXT4_DIR_PAD defines the directory entries boundaries 1966 * 1967 * NOTE: It must be a multiple of 4 1968 */ 1969 #define EXT4_DIR_PAD 4 1970 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1971 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1972 ~EXT4_DIR_ROUND) 1973 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1974 1975 /* 1976 * If we ever get support for fs block sizes > page_size, we'll need 1977 * to remove the #if statements in the next two functions... 1978 */ 1979 static inline unsigned int 1980 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1981 { 1982 unsigned len = le16_to_cpu(dlen); 1983 1984 #if (PAGE_SIZE >= 65536) 1985 if (len == EXT4_MAX_REC_LEN || len == 0) 1986 return blocksize; 1987 return (len & 65532) | ((len & 3) << 16); 1988 #else 1989 return len; 1990 #endif 1991 } 1992 1993 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1994 { 1995 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1996 BUG(); 1997 #if (PAGE_SIZE >= 65536) 1998 if (len < 65536) 1999 return cpu_to_le16(len); 2000 if (len == blocksize) { 2001 if (blocksize == 65536) 2002 return cpu_to_le16(EXT4_MAX_REC_LEN); 2003 else 2004 return cpu_to_le16(0); 2005 } 2006 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 2007 #else 2008 return cpu_to_le16(len); 2009 #endif 2010 } 2011 2012 /* 2013 * Hash Tree Directory indexing 2014 * (c) Daniel Phillips, 2001 2015 */ 2016 2017 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2018 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2019 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 2020 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2021 2022 /* Legal values for the dx_root hash_version field: */ 2023 2024 #define DX_HASH_LEGACY 0 2025 #define DX_HASH_HALF_MD4 1 2026 #define DX_HASH_TEA 2 2027 #define DX_HASH_LEGACY_UNSIGNED 3 2028 #define DX_HASH_HALF_MD4_UNSIGNED 4 2029 #define DX_HASH_TEA_UNSIGNED 5 2030 2031 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 2032 const void *address, unsigned int length) 2033 { 2034 struct { 2035 struct shash_desc shash; 2036 char ctx[4]; 2037 } desc; 2038 int err; 2039 2040 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2041 2042 desc.shash.tfm = sbi->s_chksum_driver; 2043 desc.shash.flags = 0; 2044 *(u32 *)desc.ctx = crc; 2045 2046 err = crypto_shash_update(&desc.shash, address, length); 2047 BUG_ON(err); 2048 2049 return *(u32 *)desc.ctx; 2050 } 2051 2052 #ifdef __KERNEL__ 2053 2054 /* hash info structure used by the directory hash */ 2055 struct dx_hash_info 2056 { 2057 u32 hash; 2058 u32 minor_hash; 2059 int hash_version; 2060 u32 *seed; 2061 }; 2062 2063 2064 /* 32 and 64 bit signed EOF for dx directories */ 2065 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2066 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2067 2068 2069 /* 2070 * Control parameters used by ext4_htree_next_block 2071 */ 2072 #define HASH_NB_ALWAYS 1 2073 2074 struct ext4_filename { 2075 const struct qstr *usr_fname; 2076 struct fscrypt_str disk_name; 2077 struct dx_hash_info hinfo; 2078 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2079 struct fscrypt_str crypto_buf; 2080 #endif 2081 }; 2082 2083 #define fname_name(p) ((p)->disk_name.name) 2084 #define fname_len(p) ((p)->disk_name.len) 2085 2086 /* 2087 * Describe an inode's exact location on disk and in memory 2088 */ 2089 struct ext4_iloc 2090 { 2091 struct buffer_head *bh; 2092 unsigned long offset; 2093 ext4_group_t block_group; 2094 }; 2095 2096 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2097 { 2098 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2099 } 2100 2101 /* 2102 * This structure is stuffed into the struct file's private_data field 2103 * for directories. It is where we put information so that we can do 2104 * readdir operations in hash tree order. 2105 */ 2106 struct dir_private_info { 2107 struct rb_root root; 2108 struct rb_node *curr_node; 2109 struct fname *extra_fname; 2110 loff_t last_pos; 2111 __u32 curr_hash; 2112 __u32 curr_minor_hash; 2113 __u32 next_hash; 2114 }; 2115 2116 /* calculate the first block number of the group */ 2117 static inline ext4_fsblk_t 2118 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2119 { 2120 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2121 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2122 } 2123 2124 /* 2125 * Special error return code only used by dx_probe() and its callers. 2126 */ 2127 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2128 2129 /* 2130 * Timeout and state flag for lazy initialization inode thread. 2131 */ 2132 #define EXT4_DEF_LI_WAIT_MULT 10 2133 #define EXT4_DEF_LI_MAX_START_DELAY 5 2134 #define EXT4_LAZYINIT_QUIT 0x0001 2135 #define EXT4_LAZYINIT_RUNNING 0x0002 2136 2137 /* 2138 * Lazy inode table initialization info 2139 */ 2140 struct ext4_lazy_init { 2141 unsigned long li_state; 2142 struct list_head li_request_list; 2143 struct mutex li_list_mtx; 2144 }; 2145 2146 struct ext4_li_request { 2147 struct super_block *lr_super; 2148 struct ext4_sb_info *lr_sbi; 2149 ext4_group_t lr_next_group; 2150 struct list_head lr_request; 2151 unsigned long lr_next_sched; 2152 unsigned long lr_timeout; 2153 }; 2154 2155 struct ext4_features { 2156 struct kobject f_kobj; 2157 struct completion f_kobj_unregister; 2158 }; 2159 2160 /* 2161 * This structure will be used for multiple mount protection. It will be 2162 * written into the block number saved in the s_mmp_block field in the 2163 * superblock. Programs that check MMP should assume that if 2164 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2165 * to use the filesystem, regardless of how old the timestamp is. 2166 */ 2167 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2168 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2169 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2170 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2171 2172 struct mmp_struct { 2173 __le32 mmp_magic; /* Magic number for MMP */ 2174 __le32 mmp_seq; /* Sequence no. updated periodically */ 2175 2176 /* 2177 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2178 * purposes and do not affect the correctness of the algorithm 2179 */ 2180 __le64 mmp_time; /* Time last updated */ 2181 char mmp_nodename[64]; /* Node which last updated MMP block */ 2182 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2183 2184 /* 2185 * mmp_check_interval is used to verify if the MMP block has been 2186 * updated on the block device. The value is updated based on the 2187 * maximum time to write the MMP block during an update cycle. 2188 */ 2189 __le16 mmp_check_interval; 2190 2191 __le16 mmp_pad1; 2192 __le32 mmp_pad2[226]; 2193 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2194 }; 2195 2196 /* arguments passed to the mmp thread */ 2197 struct mmpd_data { 2198 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2199 struct super_block *sb; /* super block of the fs */ 2200 }; 2201 2202 /* 2203 * Check interval multiplier 2204 * The MMP block is written every update interval and initially checked every 2205 * update interval x the multiplier (the value is then adapted based on the 2206 * write latency). The reason is that writes can be delayed under load and we 2207 * don't want readers to incorrectly assume that the filesystem is no longer 2208 * in use. 2209 */ 2210 #define EXT4_MMP_CHECK_MULT 2UL 2211 2212 /* 2213 * Minimum interval for MMP checking in seconds. 2214 */ 2215 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2216 2217 /* 2218 * Maximum interval for MMP checking in seconds. 2219 */ 2220 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2221 2222 /* 2223 * Function prototypes 2224 */ 2225 2226 /* 2227 * Ok, these declarations are also in <linux/kernel.h> but none of the 2228 * ext4 source programs needs to include it so they are duplicated here. 2229 */ 2230 # define NORET_TYPE /**/ 2231 # define ATTRIB_NORET __attribute__((noreturn)) 2232 # define NORET_AND noreturn, 2233 2234 /* bitmap.c */ 2235 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2236 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2237 struct ext4_group_desc *gdp, 2238 struct buffer_head *bh, int sz); 2239 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2240 struct ext4_group_desc *gdp, 2241 struct buffer_head *bh, int sz); 2242 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2243 struct ext4_group_desc *gdp, 2244 struct buffer_head *bh); 2245 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2246 struct ext4_group_desc *gdp, 2247 struct buffer_head *bh); 2248 2249 /* balloc.c */ 2250 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2251 ext4_fsblk_t blocknr, 2252 ext4_group_t *blockgrpp, 2253 ext4_grpblk_t *offsetp); 2254 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2255 ext4_fsblk_t block); 2256 2257 extern unsigned int ext4_block_group(struct super_block *sb, 2258 ext4_fsblk_t blocknr); 2259 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2260 ext4_fsblk_t blocknr); 2261 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2262 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2263 ext4_group_t group); 2264 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2265 ext4_fsblk_t goal, 2266 unsigned int flags, 2267 unsigned long *count, 2268 int *errp); 2269 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2270 s64 nclusters, unsigned int flags); 2271 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2272 extern void ext4_check_blocks_bitmap(struct super_block *); 2273 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2274 ext4_group_t block_group, 2275 struct buffer_head ** bh); 2276 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2277 2278 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2279 ext4_group_t block_group); 2280 extern int ext4_wait_block_bitmap(struct super_block *sb, 2281 ext4_group_t block_group, 2282 struct buffer_head *bh); 2283 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2284 ext4_group_t block_group); 2285 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2286 ext4_group_t block_group, 2287 struct ext4_group_desc *gdp); 2288 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2289 2290 static inline int ext4_sb_has_crypto(struct super_block *sb) 2291 { 2292 return ext4_has_feature_encrypt(sb); 2293 } 2294 2295 static inline bool ext4_encrypted_inode(struct inode *inode) 2296 { 2297 return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT); 2298 } 2299 2300 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2301 static inline int ext4_fname_setup_filename(struct inode *dir, 2302 const struct qstr *iname, 2303 int lookup, struct ext4_filename *fname) 2304 { 2305 struct fscrypt_name name; 2306 int err; 2307 2308 memset(fname, 0, sizeof(struct ext4_filename)); 2309 2310 err = fscrypt_setup_filename(dir, iname, lookup, &name); 2311 2312 fname->usr_fname = name.usr_fname; 2313 fname->disk_name = name.disk_name; 2314 fname->hinfo.hash = name.hash; 2315 fname->hinfo.minor_hash = name.minor_hash; 2316 fname->crypto_buf = name.crypto_buf; 2317 return err; 2318 } 2319 2320 static inline void ext4_fname_free_filename(struct ext4_filename *fname) 2321 { 2322 struct fscrypt_name name; 2323 2324 name.crypto_buf = fname->crypto_buf; 2325 fscrypt_free_filename(&name); 2326 2327 fname->crypto_buf.name = NULL; 2328 fname->usr_fname = NULL; 2329 fname->disk_name.name = NULL; 2330 } 2331 #else 2332 static inline int ext4_fname_setup_filename(struct inode *dir, 2333 const struct qstr *iname, 2334 int lookup, struct ext4_filename *fname) 2335 { 2336 fname->usr_fname = iname; 2337 fname->disk_name.name = (unsigned char *) iname->name; 2338 fname->disk_name.len = iname->len; 2339 return 0; 2340 } 2341 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { } 2342 2343 #define fscrypt_set_d_op(i) 2344 #define fscrypt_get_ctx fscrypt_notsupp_get_ctx 2345 #define fscrypt_release_ctx fscrypt_notsupp_release_ctx 2346 #define fscrypt_encrypt_page fscrypt_notsupp_encrypt_page 2347 #define fscrypt_decrypt_page fscrypt_notsupp_decrypt_page 2348 #define fscrypt_decrypt_bio_pages fscrypt_notsupp_decrypt_bio_pages 2349 #define fscrypt_pullback_bio_page fscrypt_notsupp_pullback_bio_page 2350 #define fscrypt_restore_control_page fscrypt_notsupp_restore_control_page 2351 #define fscrypt_zeroout_range fscrypt_notsupp_zeroout_range 2352 #define fscrypt_process_policy fscrypt_notsupp_process_policy 2353 #define fscrypt_get_policy fscrypt_notsupp_get_policy 2354 #define fscrypt_has_permitted_context fscrypt_notsupp_has_permitted_context 2355 #define fscrypt_inherit_context fscrypt_notsupp_inherit_context 2356 #define fscrypt_get_encryption_info fscrypt_notsupp_get_encryption_info 2357 #define fscrypt_put_encryption_info fscrypt_notsupp_put_encryption_info 2358 #define fscrypt_setup_filename fscrypt_notsupp_setup_filename 2359 #define fscrypt_free_filename fscrypt_notsupp_free_filename 2360 #define fscrypt_fname_encrypted_size fscrypt_notsupp_fname_encrypted_size 2361 #define fscrypt_fname_alloc_buffer fscrypt_notsupp_fname_alloc_buffer 2362 #define fscrypt_fname_free_buffer fscrypt_notsupp_fname_free_buffer 2363 #define fscrypt_fname_disk_to_usr fscrypt_notsupp_fname_disk_to_usr 2364 #define fscrypt_fname_usr_to_disk fscrypt_notsupp_fname_usr_to_disk 2365 #endif 2366 2367 /* dir.c */ 2368 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2369 struct file *, 2370 struct ext4_dir_entry_2 *, 2371 struct buffer_head *, char *, int, 2372 unsigned int); 2373 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2374 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2375 (de), (bh), (buf), (size), (offset))) 2376 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2377 __u32 minor_hash, 2378 struct ext4_dir_entry_2 *dirent, 2379 struct fscrypt_str *ent_name); 2380 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2381 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2382 struct buffer_head *bh, 2383 void *buf, int buf_size, 2384 struct ext4_filename *fname, 2385 struct ext4_dir_entry_2 **dest_de); 2386 int ext4_insert_dentry(struct inode *dir, 2387 struct inode *inode, 2388 struct ext4_dir_entry_2 *de, 2389 int buf_size, 2390 struct ext4_filename *fname); 2391 static inline void ext4_update_dx_flag(struct inode *inode) 2392 { 2393 if (!ext4_has_feature_dir_index(inode->i_sb)) 2394 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2395 } 2396 static unsigned char ext4_filetype_table[] = { 2397 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2398 }; 2399 2400 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2401 { 2402 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2403 return DT_UNKNOWN; 2404 2405 return ext4_filetype_table[filetype]; 2406 } 2407 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2408 void *buf, int buf_size); 2409 2410 /* fsync.c */ 2411 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2412 2413 /* hash.c */ 2414 extern int ext4fs_dirhash(const char *name, int len, struct 2415 dx_hash_info *hinfo); 2416 2417 /* ialloc.c */ 2418 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2419 const struct qstr *qstr, __u32 goal, 2420 uid_t *owner, int handle_type, 2421 unsigned int line_no, int nblocks); 2422 2423 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \ 2424 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2425 0, 0, 0) 2426 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2427 type, nblocks) \ 2428 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2429 (type), __LINE__, (nblocks)) 2430 2431 2432 extern void ext4_free_inode(handle_t *, struct inode *); 2433 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2434 extern unsigned long ext4_count_free_inodes(struct super_block *); 2435 extern unsigned long ext4_count_dirs(struct super_block *); 2436 extern void ext4_check_inodes_bitmap(struct super_block *); 2437 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2438 extern int ext4_init_inode_table(struct super_block *sb, 2439 ext4_group_t group, int barrier); 2440 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2441 2442 /* mballoc.c */ 2443 extern const struct file_operations ext4_seq_mb_groups_fops; 2444 extern long ext4_mb_stats; 2445 extern long ext4_mb_max_to_scan; 2446 extern int ext4_mb_init(struct super_block *); 2447 extern int ext4_mb_release(struct super_block *); 2448 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2449 struct ext4_allocation_request *, int *); 2450 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2451 extern void ext4_discard_preallocations(struct inode *); 2452 extern int __init ext4_init_mballoc(void); 2453 extern void ext4_exit_mballoc(void); 2454 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2455 struct buffer_head *bh, ext4_fsblk_t block, 2456 unsigned long count, int flags); 2457 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2458 ext4_group_t ngroups); 2459 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2460 ext4_group_t i, struct ext4_group_desc *desc); 2461 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2462 ext4_fsblk_t block, unsigned long count); 2463 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2464 2465 /* inode.c */ 2466 int ext4_inode_is_fast_symlink(struct inode *inode); 2467 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2468 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2469 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2470 struct buffer_head *bh_result, int create); 2471 int ext4_dax_get_block(struct inode *inode, sector_t iblock, 2472 struct buffer_head *bh_result, int create); 2473 int ext4_get_block(struct inode *inode, sector_t iblock, 2474 struct buffer_head *bh_result, int create); 2475 int ext4_dio_get_block(struct inode *inode, sector_t iblock, 2476 struct buffer_head *bh_result, int create); 2477 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2478 struct buffer_head *bh, int create); 2479 int ext4_walk_page_buffers(handle_t *handle, 2480 struct buffer_head *head, 2481 unsigned from, 2482 unsigned to, 2483 int *partial, 2484 int (*fn)(handle_t *handle, 2485 struct buffer_head *bh)); 2486 int do_journal_get_write_access(handle_t *handle, 2487 struct buffer_head *bh); 2488 #define FALL_BACK_TO_NONDELALLOC 1 2489 #define CONVERT_INLINE_DATA 2 2490 2491 extern struct inode *ext4_iget(struct super_block *, unsigned long); 2492 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long); 2493 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2494 extern int ext4_setattr(struct dentry *, struct iattr *); 2495 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 2496 struct kstat *stat); 2497 extern void ext4_evict_inode(struct inode *); 2498 extern void ext4_clear_inode(struct inode *); 2499 extern int ext4_sync_inode(handle_t *, struct inode *); 2500 extern void ext4_dirty_inode(struct inode *, int); 2501 extern int ext4_change_inode_journal_flag(struct inode *, int); 2502 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2503 extern int ext4_inode_attach_jinode(struct inode *inode); 2504 extern int ext4_can_truncate(struct inode *inode); 2505 extern void ext4_truncate(struct inode *); 2506 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2507 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 2508 extern void ext4_set_inode_flags(struct inode *); 2509 extern void ext4_get_inode_flags(struct ext4_inode_info *); 2510 extern int ext4_alloc_da_blocks(struct inode *inode); 2511 extern void ext4_set_aops(struct inode *inode); 2512 extern int ext4_writepage_trans_blocks(struct inode *); 2513 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2514 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2515 loff_t lstart, loff_t lend); 2516 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 2517 extern int ext4_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf); 2518 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2519 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 2520 extern void ext4_da_update_reserve_space(struct inode *inode, 2521 int used, int quota_claim); 2522 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 2523 ext4_fsblk_t pblk, ext4_lblk_t len); 2524 extern int ext4_get_next_extent(struct inode *inode, ext4_lblk_t lblk, 2525 unsigned int map_len, 2526 struct extent_status *result); 2527 2528 /* indirect.c */ 2529 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2530 struct ext4_map_blocks *map, int flags); 2531 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2532 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2533 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2534 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2535 ext4_lblk_t start, ext4_lblk_t end); 2536 2537 /* ioctl.c */ 2538 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2539 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2540 2541 /* migrate.c */ 2542 extern int ext4_ext_migrate(struct inode *); 2543 extern int ext4_ind_migrate(struct inode *inode); 2544 2545 /* namei.c */ 2546 extern int ext4_dirent_csum_verify(struct inode *inode, 2547 struct ext4_dir_entry *dirent); 2548 extern int ext4_orphan_add(handle_t *, struct inode *); 2549 extern int ext4_orphan_del(handle_t *, struct inode *); 2550 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2551 __u32 start_minor_hash, __u32 *next_hash); 2552 extern int ext4_search_dir(struct buffer_head *bh, 2553 char *search_buf, 2554 int buf_size, 2555 struct inode *dir, 2556 struct ext4_filename *fname, 2557 const struct qstr *d_name, 2558 unsigned int offset, 2559 struct ext4_dir_entry_2 **res_dir); 2560 extern int ext4_generic_delete_entry(handle_t *handle, 2561 struct inode *dir, 2562 struct ext4_dir_entry_2 *de_del, 2563 struct buffer_head *bh, 2564 void *entry_buf, 2565 int buf_size, 2566 int csum_size); 2567 extern bool ext4_empty_dir(struct inode *inode); 2568 2569 /* resize.c */ 2570 extern int ext4_group_add(struct super_block *sb, 2571 struct ext4_new_group_data *input); 2572 extern int ext4_group_extend(struct super_block *sb, 2573 struct ext4_super_block *es, 2574 ext4_fsblk_t n_blocks_count); 2575 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2576 2577 /* super.c */ 2578 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 2579 extern int ext4_calculate_overhead(struct super_block *sb); 2580 extern void ext4_superblock_csum_set(struct super_block *sb); 2581 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 2582 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 2583 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2584 ext4_group_t ngroup); 2585 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2586 char nbuf[16]); 2587 2588 extern __printf(4, 5) 2589 void __ext4_error(struct super_block *, const char *, unsigned int, 2590 const char *, ...); 2591 extern __printf(5, 6) 2592 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2593 const char *, ...); 2594 extern __printf(5, 6) 2595 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2596 const char *, ...); 2597 extern void __ext4_std_error(struct super_block *, const char *, 2598 unsigned int, int); 2599 extern __printf(4, 5) 2600 void __ext4_abort(struct super_block *, const char *, unsigned int, 2601 const char *, ...); 2602 extern __printf(4, 5) 2603 void __ext4_warning(struct super_block *, const char *, unsigned int, 2604 const char *, ...); 2605 extern __printf(4, 5) 2606 void __ext4_warning_inode(const struct inode *inode, const char *function, 2607 unsigned int line, const char *fmt, ...); 2608 extern __printf(3, 4) 2609 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2610 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2611 const char *, unsigned int, const char *); 2612 extern __printf(7, 8) 2613 void __ext4_grp_locked_error(const char *, unsigned int, 2614 struct super_block *, ext4_group_t, 2615 unsigned long, ext4_fsblk_t, 2616 const char *, ...); 2617 2618 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 2619 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 2620 2621 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 2622 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 2623 2624 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 2625 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 2626 2627 #ifdef CONFIG_PRINTK 2628 2629 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2630 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__) 2631 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2632 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2633 #define ext4_error(sb, fmt, ...) \ 2634 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2635 #define ext4_abort(sb, fmt, ...) \ 2636 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2637 #define ext4_warning(sb, fmt, ...) \ 2638 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2639 #define ext4_warning_inode(inode, fmt, ...) \ 2640 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 2641 #define ext4_msg(sb, level, fmt, ...) \ 2642 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 2643 #define dump_mmp_msg(sb, mmp, msg) \ 2644 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 2645 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2646 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 2647 fmt, ##__VA_ARGS__) 2648 2649 #else 2650 2651 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2652 do { \ 2653 no_printk(fmt, ##__VA_ARGS__); \ 2654 __ext4_error_inode(inode, "", 0, block, " "); \ 2655 } while (0) 2656 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2657 do { \ 2658 no_printk(fmt, ##__VA_ARGS__); \ 2659 __ext4_error_file(file, "", 0, block, " "); \ 2660 } while (0) 2661 #define ext4_error(sb, fmt, ...) \ 2662 do { \ 2663 no_printk(fmt, ##__VA_ARGS__); \ 2664 __ext4_error(sb, "", 0, " "); \ 2665 } while (0) 2666 #define ext4_abort(sb, fmt, ...) \ 2667 do { \ 2668 no_printk(fmt, ##__VA_ARGS__); \ 2669 __ext4_abort(sb, "", 0, " "); \ 2670 } while (0) 2671 #define ext4_warning(sb, fmt, ...) \ 2672 do { \ 2673 no_printk(fmt, ##__VA_ARGS__); \ 2674 __ext4_warning(sb, "", 0, " "); \ 2675 } while (0) 2676 #define ext4_warning_inode(inode, fmt, ...) \ 2677 do { \ 2678 no_printk(fmt, ##__VA_ARGS__); \ 2679 __ext4_warning_inode(inode, "", 0, " "); \ 2680 } while (0) 2681 #define ext4_msg(sb, level, fmt, ...) \ 2682 do { \ 2683 no_printk(fmt, ##__VA_ARGS__); \ 2684 __ext4_msg(sb, "", " "); \ 2685 } while (0) 2686 #define dump_mmp_msg(sb, mmp, msg) \ 2687 __dump_mmp_msg(sb, mmp, "", 0, "") 2688 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2689 do { \ 2690 no_printk(fmt, ##__VA_ARGS__); \ 2691 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 2692 } while (0) 2693 2694 #endif 2695 2696 extern void ext4_update_dynamic_rev(struct super_block *sb); 2697 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2698 __u32 compat); 2699 extern int ext4_update_rocompat_feature(handle_t *handle, 2700 struct super_block *sb, __u32 rocompat); 2701 extern int ext4_update_incompat_feature(handle_t *handle, 2702 struct super_block *sb, __u32 incompat); 2703 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2704 struct ext4_group_desc *bg); 2705 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2706 struct ext4_group_desc *bg); 2707 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2708 struct ext4_group_desc *bg); 2709 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2710 struct ext4_group_desc *bg); 2711 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2712 struct ext4_group_desc *bg); 2713 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2714 struct ext4_group_desc *bg); 2715 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2716 struct ext4_group_desc *bg); 2717 extern void ext4_block_bitmap_set(struct super_block *sb, 2718 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2719 extern void ext4_inode_bitmap_set(struct super_block *sb, 2720 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2721 extern void ext4_inode_table_set(struct super_block *sb, 2722 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2723 extern void ext4_free_group_clusters_set(struct super_block *sb, 2724 struct ext4_group_desc *bg, 2725 __u32 count); 2726 extern void ext4_free_inodes_set(struct super_block *sb, 2727 struct ext4_group_desc *bg, __u32 count); 2728 extern void ext4_used_dirs_set(struct super_block *sb, 2729 struct ext4_group_desc *bg, __u32 count); 2730 extern void ext4_itable_unused_set(struct super_block *sb, 2731 struct ext4_group_desc *bg, __u32 count); 2732 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2733 struct ext4_group_desc *gdp); 2734 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2735 struct ext4_group_desc *gdp); 2736 extern int ext4_register_li_request(struct super_block *sb, 2737 ext4_group_t first_not_zeroed); 2738 2739 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2740 { 2741 return ext4_has_feature_gdt_csum(sb) || 2742 EXT4_SB(sb)->s_chksum_driver != NULL; 2743 } 2744 2745 static inline int ext4_has_metadata_csum(struct super_block *sb) 2746 { 2747 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 2748 !EXT4_SB(sb)->s_chksum_driver); 2749 2750 return (EXT4_SB(sb)->s_chksum_driver != NULL); 2751 } 2752 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2753 { 2754 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2755 le32_to_cpu(es->s_blocks_count_lo); 2756 } 2757 2758 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2759 { 2760 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2761 le32_to_cpu(es->s_r_blocks_count_lo); 2762 } 2763 2764 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2765 { 2766 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2767 le32_to_cpu(es->s_free_blocks_count_lo); 2768 } 2769 2770 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2771 ext4_fsblk_t blk) 2772 { 2773 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2774 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2775 } 2776 2777 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2778 ext4_fsblk_t blk) 2779 { 2780 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2781 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2782 } 2783 2784 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2785 ext4_fsblk_t blk) 2786 { 2787 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2788 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2789 } 2790 2791 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 2792 { 2793 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2794 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2795 le32_to_cpu(raw_inode->i_size_lo); 2796 else 2797 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2798 } 2799 2800 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2801 { 2802 raw_inode->i_size_lo = cpu_to_le32(i_size); 2803 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2804 } 2805 2806 static inline 2807 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2808 ext4_group_t group) 2809 { 2810 struct ext4_group_info ***grp_info; 2811 long indexv, indexh; 2812 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 2813 grp_info = EXT4_SB(sb)->s_group_info; 2814 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2815 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2816 return grp_info[indexv][indexh]; 2817 } 2818 2819 /* 2820 * Reading s_groups_count requires using smp_rmb() afterwards. See 2821 * the locking protocol documented in the comments of ext4_group_add() 2822 * in resize.c 2823 */ 2824 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2825 { 2826 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2827 2828 smp_rmb(); 2829 return ngroups; 2830 } 2831 2832 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2833 ext4_group_t block_group) 2834 { 2835 return block_group >> sbi->s_log_groups_per_flex; 2836 } 2837 2838 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2839 { 2840 return 1 << sbi->s_log_groups_per_flex; 2841 } 2842 2843 #define ext4_std_error(sb, errno) \ 2844 do { \ 2845 if ((errno)) \ 2846 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2847 } while (0) 2848 2849 #ifdef CONFIG_SMP 2850 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2851 * counters. So we need to make sure we have free clusters more 2852 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2853 */ 2854 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2855 #else 2856 #define EXT4_FREECLUSTERS_WATERMARK 0 2857 #endif 2858 2859 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 2860 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2861 { 2862 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 2863 !inode_is_locked(inode)); 2864 down_write(&EXT4_I(inode)->i_data_sem); 2865 if (newsize > EXT4_I(inode)->i_disksize) 2866 EXT4_I(inode)->i_disksize = newsize; 2867 up_write(&EXT4_I(inode)->i_data_sem); 2868 } 2869 2870 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 2871 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 2872 { 2873 int changed = 0; 2874 2875 if (newsize > inode->i_size) { 2876 i_size_write(inode, newsize); 2877 changed = 1; 2878 } 2879 if (newsize > EXT4_I(inode)->i_disksize) { 2880 ext4_update_i_disksize(inode, newsize); 2881 changed |= 2; 2882 } 2883 return changed; 2884 } 2885 2886 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 2887 loff_t len); 2888 2889 struct ext4_group_info { 2890 unsigned long bb_state; 2891 struct rb_root bb_free_root; 2892 ext4_grpblk_t bb_first_free; /* first free block */ 2893 ext4_grpblk_t bb_free; /* total free blocks */ 2894 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 2895 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 2896 struct list_head bb_prealloc_list; 2897 #ifdef DOUBLE_CHECK 2898 void *bb_bitmap; 2899 #endif 2900 struct rw_semaphore alloc_sem; 2901 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2902 * regions, index is order. 2903 * bb_counters[3] = 5 means 2904 * 5 free 8-block regions. */ 2905 }; 2906 2907 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 2908 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 2909 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 2910 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 2911 2912 #define EXT4_MB_GRP_NEED_INIT(grp) \ 2913 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 2914 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 2915 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2916 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 2917 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2918 2919 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 2920 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2921 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 2922 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2923 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 2924 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2925 2926 #define EXT4_MAX_CONTENTION 8 2927 #define EXT4_CONTENTION_THRESHOLD 2 2928 2929 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2930 ext4_group_t group) 2931 { 2932 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2933 } 2934 2935 /* 2936 * Returns true if the filesystem is busy enough that attempts to 2937 * access the block group locks has run into contention. 2938 */ 2939 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 2940 { 2941 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 2942 } 2943 2944 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 2945 { 2946 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 2947 if (spin_trylock(lock)) 2948 /* 2949 * We're able to grab the lock right away, so drop the 2950 * lock contention counter. 2951 */ 2952 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 2953 else { 2954 /* 2955 * The lock is busy, so bump the contention counter, 2956 * and then wait on the spin lock. 2957 */ 2958 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 2959 EXT4_MAX_CONTENTION); 2960 spin_lock(lock); 2961 } 2962 } 2963 2964 static inline void ext4_unlock_group(struct super_block *sb, 2965 ext4_group_t group) 2966 { 2967 spin_unlock(ext4_group_lock_ptr(sb, group)); 2968 } 2969 2970 /* 2971 * Block validity checking 2972 */ 2973 #define ext4_check_indirect_blockref(inode, bh) \ 2974 ext4_check_blockref(__func__, __LINE__, inode, \ 2975 (__le32 *)(bh)->b_data, \ 2976 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 2977 2978 #define ext4_ind_check_inode(inode) \ 2979 ext4_check_blockref(__func__, __LINE__, inode, \ 2980 EXT4_I(inode)->i_data, \ 2981 EXT4_NDIR_BLOCKS) 2982 2983 /* 2984 * Inodes and files operations 2985 */ 2986 2987 /* dir.c */ 2988 extern const struct file_operations ext4_dir_operations; 2989 2990 /* file.c */ 2991 extern const struct inode_operations ext4_file_inode_operations; 2992 extern const struct file_operations ext4_file_operations; 2993 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 2994 2995 /* inline.c */ 2996 extern int ext4_get_max_inline_size(struct inode *inode); 2997 extern int ext4_find_inline_data_nolock(struct inode *inode); 2998 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 2999 unsigned int len); 3000 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 3001 3002 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 3003 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 3004 struct inode *inode, 3005 loff_t pos, unsigned len, 3006 unsigned flags, 3007 struct page **pagep); 3008 extern int ext4_write_inline_data_end(struct inode *inode, 3009 loff_t pos, unsigned len, 3010 unsigned copied, 3011 struct page *page); 3012 extern struct buffer_head * 3013 ext4_journalled_write_inline_data(struct inode *inode, 3014 unsigned len, 3015 struct page *page); 3016 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 3017 struct inode *inode, 3018 loff_t pos, unsigned len, 3019 unsigned flags, 3020 struct page **pagep, 3021 void **fsdata); 3022 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 3023 unsigned len, unsigned copied, 3024 struct page *page); 3025 extern int ext4_try_add_inline_entry(handle_t *handle, 3026 struct ext4_filename *fname, 3027 struct inode *dir, struct inode *inode); 3028 extern int ext4_try_create_inline_dir(handle_t *handle, 3029 struct inode *parent, 3030 struct inode *inode); 3031 extern int ext4_read_inline_dir(struct file *filp, 3032 struct dir_context *ctx, 3033 int *has_inline_data); 3034 extern int htree_inlinedir_to_tree(struct file *dir_file, 3035 struct inode *dir, ext4_lblk_t block, 3036 struct dx_hash_info *hinfo, 3037 __u32 start_hash, __u32 start_minor_hash, 3038 int *has_inline_data); 3039 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3040 struct ext4_filename *fname, 3041 const struct qstr *d_name, 3042 struct ext4_dir_entry_2 **res_dir, 3043 int *has_inline_data); 3044 extern int ext4_delete_inline_entry(handle_t *handle, 3045 struct inode *dir, 3046 struct ext4_dir_entry_2 *de_del, 3047 struct buffer_head *bh, 3048 int *has_inline_data); 3049 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data); 3050 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3051 struct ext4_dir_entry_2 **parent_de, 3052 int *retval); 3053 extern int ext4_inline_data_fiemap(struct inode *inode, 3054 struct fiemap_extent_info *fieinfo, 3055 int *has_inline, __u64 start, __u64 len); 3056 extern int ext4_try_to_evict_inline_data(handle_t *handle, 3057 struct inode *inode, 3058 int needed); 3059 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3060 3061 extern int ext4_convert_inline_data(struct inode *inode); 3062 3063 static inline int ext4_has_inline_data(struct inode *inode) 3064 { 3065 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3066 EXT4_I(inode)->i_inline_off; 3067 } 3068 3069 /* namei.c */ 3070 extern const struct inode_operations ext4_dir_inode_operations; 3071 extern const struct inode_operations ext4_special_inode_operations; 3072 extern struct dentry *ext4_get_parent(struct dentry *child); 3073 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3074 struct ext4_dir_entry_2 *de, 3075 int blocksize, int csum_size, 3076 unsigned int parent_ino, int dotdot_real_len); 3077 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t, 3078 unsigned int blocksize); 3079 extern int ext4_handle_dirty_dirent_node(handle_t *handle, 3080 struct inode *inode, 3081 struct buffer_head *bh); 3082 #define S_SHIFT 12 3083 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = { 3084 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3085 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3086 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3087 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3088 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3089 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3090 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3091 }; 3092 3093 static inline void ext4_set_de_type(struct super_block *sb, 3094 struct ext4_dir_entry_2 *de, 3095 umode_t mode) { 3096 if (ext4_has_feature_filetype(sb)) 3097 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3098 } 3099 3100 /* readpages.c */ 3101 extern int ext4_mpage_readpages(struct address_space *mapping, 3102 struct list_head *pages, struct page *page, 3103 unsigned nr_pages); 3104 3105 /* symlink.c */ 3106 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3107 extern const struct inode_operations ext4_symlink_inode_operations; 3108 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3109 3110 /* sysfs.c */ 3111 extern int ext4_register_sysfs(struct super_block *sb); 3112 extern void ext4_unregister_sysfs(struct super_block *sb); 3113 extern int __init ext4_init_sysfs(void); 3114 extern void ext4_exit_sysfs(void); 3115 3116 /* block_validity */ 3117 extern void ext4_release_system_zone(struct super_block *sb); 3118 extern int ext4_setup_system_zone(struct super_block *sb); 3119 extern int __init ext4_init_system_zone(void); 3120 extern void ext4_exit_system_zone(void); 3121 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 3122 ext4_fsblk_t start_blk, 3123 unsigned int count); 3124 extern int ext4_check_blockref(const char *, unsigned int, 3125 struct inode *, __le32 *, unsigned int); 3126 3127 /* extents.c */ 3128 struct ext4_ext_path; 3129 struct ext4_extent; 3130 3131 /* 3132 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3133 * __le32. 3134 */ 3135 #define EXT_MAX_BLOCKS 0xffffffff 3136 3137 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 3138 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 3139 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3140 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3141 struct ext4_map_blocks *map, int flags); 3142 extern void ext4_ext_truncate(handle_t *, struct inode *); 3143 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3144 ext4_lblk_t end); 3145 extern void ext4_ext_init(struct super_block *); 3146 extern void ext4_ext_release(struct super_block *); 3147 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3148 loff_t len); 3149 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3150 loff_t offset, ssize_t len); 3151 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3152 struct ext4_map_blocks *map, int flags); 3153 extern int ext4_ext_calc_metadata_amount(struct inode *inode, 3154 ext4_lblk_t lblocks); 3155 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3156 int num, 3157 struct ext4_ext_path *path); 3158 extern int ext4_can_extents_be_merged(struct inode *inode, 3159 struct ext4_extent *ex1, 3160 struct ext4_extent *ex2); 3161 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3162 struct ext4_ext_path **, 3163 struct ext4_extent *, int); 3164 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3165 struct ext4_ext_path **, 3166 int flags); 3167 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 3168 extern int ext4_ext_check_inode(struct inode *inode); 3169 extern int ext4_find_delalloc_range(struct inode *inode, 3170 ext4_lblk_t lblk_start, 3171 ext4_lblk_t lblk_end); 3172 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk); 3173 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3174 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3175 __u64 start, __u64 len); 3176 extern int ext4_ext_precache(struct inode *inode); 3177 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len); 3178 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len); 3179 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3180 struct inode *inode2, ext4_lblk_t lblk1, 3181 ext4_lblk_t lblk2, ext4_lblk_t count, 3182 int mark_unwritten,int *err); 3183 3184 /* move_extent.c */ 3185 extern void ext4_double_down_write_data_sem(struct inode *first, 3186 struct inode *second); 3187 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3188 struct inode *donor_inode); 3189 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3190 __u64 start_orig, __u64 start_donor, 3191 __u64 len, __u64 *moved_len); 3192 3193 /* page-io.c */ 3194 extern int __init ext4_init_pageio(void); 3195 extern void ext4_exit_pageio(void); 3196 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3197 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3198 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3199 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3200 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3201 struct writeback_control *wbc); 3202 extern void ext4_end_io_rsv_work(struct work_struct *work); 3203 extern void ext4_io_submit(struct ext4_io_submit *io); 3204 extern int ext4_bio_write_page(struct ext4_io_submit *io, 3205 struct page *page, 3206 int len, 3207 struct writeback_control *wbc, 3208 bool keep_towrite); 3209 3210 /* mmp.c */ 3211 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3212 3213 /* 3214 * Add new method to test whether block and inode bitmaps are properly 3215 * initialized. With uninit_bg reading the block from disk is not enough 3216 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3217 */ 3218 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3219 3220 static inline int bitmap_uptodate(struct buffer_head *bh) 3221 { 3222 return (buffer_uptodate(bh) && 3223 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3224 } 3225 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3226 { 3227 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3228 } 3229 3230 /* 3231 * Disable DIO read nolock optimization, so new dioreaders will be forced 3232 * to grab i_mutex 3233 */ 3234 static inline void ext4_inode_block_unlocked_dio(struct inode *inode) 3235 { 3236 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 3237 smp_mb(); 3238 } 3239 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode) 3240 { 3241 smp_mb(); 3242 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 3243 } 3244 3245 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3246 3247 /* For ioend & aio unwritten conversion wait queues */ 3248 #define EXT4_WQ_HASH_SZ 37 3249 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3250 EXT4_WQ_HASH_SZ]) 3251 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3252 3253 #define EXT4_RESIZING 0 3254 extern int ext4_resize_begin(struct super_block *sb); 3255 extern void ext4_resize_end(struct super_block *sb); 3256 3257 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 3258 struct ext4_io_end *io_end) 3259 { 3260 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 3261 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3262 atomic_inc(&EXT4_I(inode)->i_unwritten); 3263 } 3264 } 3265 3266 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3267 { 3268 struct inode *inode = io_end->inode; 3269 3270 if (io_end->flag & EXT4_IO_END_UNWRITTEN) { 3271 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3272 /* Wake up anyone waiting on unwritten extent conversion */ 3273 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) 3274 wake_up_all(ext4_ioend_wq(inode)); 3275 } 3276 } 3277 3278 static inline bool ext4_aligned_io(struct inode *inode, loff_t off, loff_t len) 3279 { 3280 int blksize = 1 << inode->i_blkbits; 3281 3282 return IS_ALIGNED(off, blksize) && IS_ALIGNED(len, blksize); 3283 } 3284 3285 #endif /* __KERNEL__ */ 3286 3287 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3288 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3289 3290 #endif /* _EXT4_H */ 3291