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/falloc.h> 36 #ifdef __KERNEL__ 37 #include <linux/compat.h> 38 #endif 39 40 /* 41 * The fourth extended filesystem constants/structures 42 */ 43 44 /* 45 * with AGGRESSIVE_CHECK allocator runs consistency checks over 46 * structures. these checks slow things down a lot 47 */ 48 #define AGGRESSIVE_CHECK__ 49 50 /* 51 * with DOUBLE_CHECK defined mballoc creates persistent in-core 52 * bitmaps, maintains and uses them to check for double allocations 53 */ 54 #define DOUBLE_CHECK__ 55 56 /* 57 * Define EXT4FS_DEBUG to produce debug messages 58 */ 59 #undef EXT4FS_DEBUG 60 61 /* 62 * Debug code 63 */ 64 #ifdef EXT4FS_DEBUG 65 #define ext4_debug(f, a...) \ 66 do { \ 67 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 68 __FILE__, __LINE__, __func__); \ 69 printk(KERN_DEBUG f, ## a); \ 70 } while (0) 71 #else 72 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 73 #endif 74 75 /* 76 * Turn on EXT_DEBUG to get lots of info about extents operations. 77 */ 78 #define EXT_DEBUG__ 79 #ifdef EXT_DEBUG 80 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__) 81 #else 82 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 83 #endif 84 85 /* data type for block offset of block group */ 86 typedef int ext4_grpblk_t; 87 88 /* data type for filesystem-wide blocks number */ 89 typedef unsigned long long ext4_fsblk_t; 90 91 /* data type for file logical block number */ 92 typedef __u32 ext4_lblk_t; 93 94 /* data type for block group number */ 95 typedef unsigned int ext4_group_t; 96 97 enum SHIFT_DIRECTION { 98 SHIFT_LEFT = 0, 99 SHIFT_RIGHT, 100 }; 101 102 /* 103 * Flags used in mballoc's allocation_context flags field. 104 * 105 * Also used to show what's going on for debugging purposes when the 106 * flag field is exported via the traceport interface 107 */ 108 109 /* prefer goal again. length */ 110 #define EXT4_MB_HINT_MERGE 0x0001 111 /* blocks already reserved */ 112 #define EXT4_MB_HINT_RESERVED 0x0002 113 /* metadata is being allocated */ 114 #define EXT4_MB_HINT_METADATA 0x0004 115 /* first blocks in the file */ 116 #define EXT4_MB_HINT_FIRST 0x0008 117 /* search for the best chunk */ 118 #define EXT4_MB_HINT_BEST 0x0010 119 /* data is being allocated */ 120 #define EXT4_MB_HINT_DATA 0x0020 121 /* don't preallocate (for tails) */ 122 #define EXT4_MB_HINT_NOPREALLOC 0x0040 123 /* allocate for locality group */ 124 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 125 /* allocate goal blocks or none */ 126 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 127 /* goal is meaningful */ 128 #define EXT4_MB_HINT_TRY_GOAL 0x0200 129 /* blocks already pre-reserved by delayed allocation */ 130 #define EXT4_MB_DELALLOC_RESERVED 0x0400 131 /* We are doing stream allocation */ 132 #define EXT4_MB_STREAM_ALLOC 0x0800 133 /* Use reserved root blocks if needed */ 134 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 135 /* Use blocks from reserved pool */ 136 #define EXT4_MB_USE_RESERVED 0x2000 137 138 struct ext4_allocation_request { 139 /* target inode for block we're allocating */ 140 struct inode *inode; 141 /* how many blocks we want to allocate */ 142 unsigned int len; 143 /* logical block in target inode */ 144 ext4_lblk_t logical; 145 /* the closest logical allocated block to the left */ 146 ext4_lblk_t lleft; 147 /* the closest logical allocated block to the right */ 148 ext4_lblk_t lright; 149 /* phys. target (a hint) */ 150 ext4_fsblk_t goal; 151 /* phys. block for the closest logical allocated block to the left */ 152 ext4_fsblk_t pleft; 153 /* phys. block for the closest logical allocated block to the right */ 154 ext4_fsblk_t pright; 155 /* flags. see above EXT4_MB_HINT_* */ 156 unsigned int flags; 157 }; 158 159 /* 160 * Logical to physical block mapping, used by ext4_map_blocks() 161 * 162 * This structure is used to pass requests into ext4_map_blocks() as 163 * well as to store the information returned by ext4_map_blocks(). It 164 * takes less room on the stack than a struct buffer_head. 165 */ 166 #define EXT4_MAP_NEW (1 << BH_New) 167 #define EXT4_MAP_MAPPED (1 << BH_Mapped) 168 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 169 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 170 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 171 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 172 173 struct ext4_map_blocks { 174 ext4_fsblk_t m_pblk; 175 ext4_lblk_t m_lblk; 176 unsigned int m_len; 177 unsigned int m_flags; 178 }; 179 180 /* 181 * Flags for ext4_io_end->flags 182 */ 183 #define EXT4_IO_END_UNWRITTEN 0x0001 184 185 /* 186 * For converting unwritten extents on a work queue. 'handle' is used for 187 * buffered writeback. 188 */ 189 typedef struct ext4_io_end { 190 struct list_head list; /* per-file finished IO list */ 191 handle_t *handle; /* handle reserved for extent 192 * conversion */ 193 struct inode *inode; /* file being written to */ 194 struct bio *bio; /* Linked list of completed 195 * bios covering the extent */ 196 unsigned int flag; /* unwritten or not */ 197 atomic_t count; /* reference counter */ 198 loff_t offset; /* offset in the file */ 199 ssize_t size; /* size of the extent */ 200 } ext4_io_end_t; 201 202 struct ext4_io_submit { 203 struct writeback_control *io_wbc; 204 struct bio *io_bio; 205 ext4_io_end_t *io_end; 206 sector_t io_next_block; 207 }; 208 209 /* 210 * Special inodes numbers 211 */ 212 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 213 #define EXT4_ROOT_INO 2 /* Root inode */ 214 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 215 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 216 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 217 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 218 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 219 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 220 221 /* First non-reserved inode for old ext4 filesystems */ 222 #define EXT4_GOOD_OLD_FIRST_INO 11 223 224 /* 225 * Maximal count of links to a file 226 */ 227 #define EXT4_LINK_MAX 65000 228 229 /* 230 * Macro-instructions used to manage several block sizes 231 */ 232 #define EXT4_MIN_BLOCK_SIZE 1024 233 #define EXT4_MAX_BLOCK_SIZE 65536 234 #define EXT4_MIN_BLOCK_LOG_SIZE 10 235 #define EXT4_MAX_BLOCK_LOG_SIZE 16 236 #ifdef __KERNEL__ 237 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 238 #else 239 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 240 #endif 241 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 242 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 243 EXT4_SB(s)->s_cluster_bits) 244 #ifdef __KERNEL__ 245 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 246 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 247 #else 248 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 249 #endif 250 #ifdef __KERNEL__ 251 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 252 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 253 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 254 #else 255 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 256 EXT4_GOOD_OLD_INODE_SIZE : \ 257 (s)->s_inode_size) 258 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 259 EXT4_GOOD_OLD_FIRST_INO : \ 260 (s)->s_first_ino) 261 #endif 262 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 263 264 /* Translate a block number to a cluster number */ 265 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 266 /* Translate a cluster number to a block number */ 267 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 268 /* Translate # of blks to # of clusters */ 269 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 270 (sbi)->s_cluster_bits) 271 /* Mask out the low bits to get the starting block of the cluster */ 272 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 273 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 274 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 275 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 276 /* Get the cluster offset */ 277 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 278 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 279 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 280 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 281 282 /* 283 * Structure of a blocks group descriptor 284 */ 285 struct ext4_group_desc 286 { 287 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 288 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 289 __le32 bg_inode_table_lo; /* Inodes table block */ 290 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 291 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 292 __le16 bg_used_dirs_count_lo; /* Directories count */ 293 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 294 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 295 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 296 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 297 __le16 bg_itable_unused_lo; /* Unused inodes count */ 298 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 299 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 300 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 301 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 302 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 303 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 304 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 305 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 306 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 307 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 308 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 309 __u32 bg_reserved; 310 }; 311 312 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 313 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 314 sizeof(__le16)) 315 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 316 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 317 sizeof(__le16)) 318 319 /* 320 * Structure of a flex block group info 321 */ 322 323 struct flex_groups { 324 atomic64_t free_clusters; 325 atomic_t free_inodes; 326 atomic_t used_dirs; 327 }; 328 329 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 330 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 331 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 332 333 /* 334 * Macro-instructions used to manage group descriptors 335 */ 336 #define EXT4_MIN_DESC_SIZE 32 337 #define EXT4_MIN_DESC_SIZE_64BIT 64 338 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 339 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 340 #ifdef __KERNEL__ 341 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 342 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 343 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 344 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 345 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 346 #else 347 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 348 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 349 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 350 #endif 351 352 /* 353 * Constants relative to the data blocks 354 */ 355 #define EXT4_NDIR_BLOCKS 12 356 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 357 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 358 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 359 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 360 361 /* 362 * Inode flags 363 */ 364 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 365 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 366 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 367 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 368 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 369 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 370 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 371 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 372 /* Reserved for compression usage... */ 373 #define EXT4_DIRTY_FL 0x00000100 374 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 375 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 376 /* nb: was previously EXT2_ECOMPR_FL */ 377 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 378 /* End compression flags --- maybe not all used */ 379 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 380 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 381 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 382 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 383 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 384 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 385 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 386 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 387 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 388 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 389 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 390 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 391 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 392 393 #define EXT4_FL_USER_VISIBLE 0x304BDFFF /* User visible flags */ 394 #define EXT4_FL_USER_MODIFIABLE 0x204380FF /* User modifiable flags */ 395 396 #define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \ 397 EXT4_IMMUTABLE_FL | \ 398 EXT4_APPEND_FL | \ 399 EXT4_NODUMP_FL | \ 400 EXT4_NOATIME_FL | \ 401 EXT4_PROJINHERIT_FL) 402 403 /* Flags that should be inherited by new inodes from their parent. */ 404 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 405 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 406 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 407 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 408 EXT4_PROJINHERIT_FL) 409 410 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 411 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 412 413 /* Flags that are appropriate for non-directories/regular files. */ 414 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 415 416 /* Mask out flags that are inappropriate for the given type of inode. */ 417 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 418 { 419 if (S_ISDIR(mode)) 420 return flags; 421 else if (S_ISREG(mode)) 422 return flags & EXT4_REG_FLMASK; 423 else 424 return flags & EXT4_OTHER_FLMASK; 425 } 426 427 /* 428 * Inode flags used for atomic set/get 429 */ 430 enum { 431 EXT4_INODE_SECRM = 0, /* Secure deletion */ 432 EXT4_INODE_UNRM = 1, /* Undelete */ 433 EXT4_INODE_COMPR = 2, /* Compress file */ 434 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 435 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 436 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 437 EXT4_INODE_NODUMP = 6, /* do not dump file */ 438 EXT4_INODE_NOATIME = 7, /* do not update atime */ 439 /* Reserved for compression usage... */ 440 EXT4_INODE_DIRTY = 8, 441 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 442 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 443 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 444 /* End compression flags --- maybe not all used */ 445 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 446 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 447 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 448 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 449 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 450 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 451 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 452 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 453 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 454 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 455 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 456 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 457 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 458 }; 459 460 /* 461 * Since it's pretty easy to mix up bit numbers and hex values, we use a 462 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 463 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 464 * any extra space in the compiled kernel image, otherwise, the build will fail. 465 * It's important that these values are the same, since we are using 466 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 467 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 468 * values found in ext2, ext3 and ext4 filesystems, and of course the values 469 * defined in e2fsprogs. 470 * 471 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 472 */ 473 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 474 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 475 476 static inline void ext4_check_flag_values(void) 477 { 478 CHECK_FLAG_VALUE(SECRM); 479 CHECK_FLAG_VALUE(UNRM); 480 CHECK_FLAG_VALUE(COMPR); 481 CHECK_FLAG_VALUE(SYNC); 482 CHECK_FLAG_VALUE(IMMUTABLE); 483 CHECK_FLAG_VALUE(APPEND); 484 CHECK_FLAG_VALUE(NODUMP); 485 CHECK_FLAG_VALUE(NOATIME); 486 CHECK_FLAG_VALUE(DIRTY); 487 CHECK_FLAG_VALUE(COMPRBLK); 488 CHECK_FLAG_VALUE(NOCOMPR); 489 CHECK_FLAG_VALUE(ENCRYPT); 490 CHECK_FLAG_VALUE(INDEX); 491 CHECK_FLAG_VALUE(IMAGIC); 492 CHECK_FLAG_VALUE(JOURNAL_DATA); 493 CHECK_FLAG_VALUE(NOTAIL); 494 CHECK_FLAG_VALUE(DIRSYNC); 495 CHECK_FLAG_VALUE(TOPDIR); 496 CHECK_FLAG_VALUE(HUGE_FILE); 497 CHECK_FLAG_VALUE(EXTENTS); 498 CHECK_FLAG_VALUE(EA_INODE); 499 CHECK_FLAG_VALUE(EOFBLOCKS); 500 CHECK_FLAG_VALUE(INLINE_DATA); 501 CHECK_FLAG_VALUE(PROJINHERIT); 502 CHECK_FLAG_VALUE(RESERVED); 503 } 504 505 /* Used to pass group descriptor data when online resize is done */ 506 struct ext4_new_group_input { 507 __u32 group; /* Group number for this data */ 508 __u64 block_bitmap; /* Absolute block number of block bitmap */ 509 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 510 __u64 inode_table; /* Absolute block number of inode table start */ 511 __u32 blocks_count; /* Total number of blocks in this group */ 512 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 513 __u16 unused; 514 }; 515 516 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 517 struct compat_ext4_new_group_input { 518 u32 group; 519 compat_u64 block_bitmap; 520 compat_u64 inode_bitmap; 521 compat_u64 inode_table; 522 u32 blocks_count; 523 u16 reserved_blocks; 524 u16 unused; 525 }; 526 #endif 527 528 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 529 struct ext4_new_group_data { 530 __u32 group; 531 __u64 block_bitmap; 532 __u64 inode_bitmap; 533 __u64 inode_table; 534 __u32 blocks_count; 535 __u16 reserved_blocks; 536 __u16 unused; 537 __u32 free_blocks_count; 538 }; 539 540 /* Indexes used to index group tables in ext4_new_group_data */ 541 enum { 542 BLOCK_BITMAP = 0, /* block bitmap */ 543 INODE_BITMAP, /* inode bitmap */ 544 INODE_TABLE, /* inode tables */ 545 GROUP_TABLE_COUNT, 546 }; 547 548 /* 549 * Flags used by ext4_map_blocks() 550 */ 551 /* Allocate any needed blocks and/or convert an unwritten 552 extent to be an initialized ext4 */ 553 #define EXT4_GET_BLOCKS_CREATE 0x0001 554 /* Request the creation of an unwritten extent */ 555 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 556 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 557 EXT4_GET_BLOCKS_CREATE) 558 /* Caller is from the delayed allocation writeout path 559 * finally doing the actual allocation of delayed blocks */ 560 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 561 /* caller is from the direct IO path, request to creation of an 562 unwritten extents if not allocated, split the unwritten 563 extent if blocks has been preallocated already*/ 564 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 565 #define EXT4_GET_BLOCKS_CONVERT 0x0010 566 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 567 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 568 /* Convert extent to initialized after IO complete */ 569 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 570 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 571 /* Eventual metadata allocation (due to growing extent tree) 572 * should not fail, so try to use reserved blocks for that.*/ 573 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 574 /* Don't normalize allocation size (used for fallocate) */ 575 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 576 /* Request will not result in inode size update (user for fallocate) */ 577 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 578 /* Convert written extents to unwritten */ 579 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 580 /* Write zeros to newly created written extents */ 581 #define EXT4_GET_BLOCKS_ZERO 0x0200 582 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 583 EXT4_GET_BLOCKS_ZERO) 584 585 /* 586 * The bit position of these flags must not overlap with any of the 587 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 588 * read_extent_tree_block(), ext4_split_extent_at(), 589 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 590 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 591 * caching the extents when reading from the extent tree while a 592 * truncate or punch hole operation is in progress. 593 */ 594 #define EXT4_EX_NOCACHE 0x40000000 595 #define EXT4_EX_FORCE_CACHE 0x20000000 596 597 /* 598 * Flags used by ext4_free_blocks 599 */ 600 #define EXT4_FREE_BLOCKS_METADATA 0x0001 601 #define EXT4_FREE_BLOCKS_FORGET 0x0002 602 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 603 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 604 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 605 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 606 607 /* Encryption algorithms */ 608 #define EXT4_ENCRYPTION_MODE_INVALID 0 609 #define EXT4_ENCRYPTION_MODE_AES_256_XTS 1 610 #define EXT4_ENCRYPTION_MODE_AES_256_GCM 2 611 #define EXT4_ENCRYPTION_MODE_AES_256_CBC 3 612 #define EXT4_ENCRYPTION_MODE_AES_256_CTS 4 613 614 #include "ext4_crypto.h" 615 616 /* 617 * ioctl commands 618 */ 619 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 620 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 621 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 622 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 623 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 624 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 625 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 626 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 627 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 628 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 629 #define EXT4_IOC_MIGRATE _IO('f', 9) 630 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 631 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 632 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 633 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 634 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 635 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 636 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 637 #define EXT4_IOC_SET_ENCRYPTION_POLICY _IOR('f', 19, struct ext4_encryption_policy) 638 #define EXT4_IOC_GET_ENCRYPTION_PWSALT _IOW('f', 20, __u8[16]) 639 #define EXT4_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct ext4_encryption_policy) 640 641 #ifndef FS_IOC_FSGETXATTR 642 /* Until the uapi changes get merged for project quota... */ 643 644 #define FS_IOC_FSGETXATTR _IOR('X', 31, struct fsxattr) 645 #define FS_IOC_FSSETXATTR _IOW('X', 32, struct fsxattr) 646 647 /* 648 * Structure for FS_IOC_FSGETXATTR and FS_IOC_FSSETXATTR. 649 */ 650 struct fsxattr { 651 __u32 fsx_xflags; /* xflags field value (get/set) */ 652 __u32 fsx_extsize; /* extsize field value (get/set)*/ 653 __u32 fsx_nextents; /* nextents field value (get) */ 654 __u32 fsx_projid; /* project identifier (get/set) */ 655 unsigned char fsx_pad[12]; 656 }; 657 658 /* 659 * Flags for the fsx_xflags field 660 */ 661 #define FS_XFLAG_REALTIME 0x00000001 /* data in realtime volume */ 662 #define FS_XFLAG_PREALLOC 0x00000002 /* preallocated file extents */ 663 #define FS_XFLAG_IMMUTABLE 0x00000008 /* file cannot be modified */ 664 #define FS_XFLAG_APPEND 0x00000010 /* all writes append */ 665 #define FS_XFLAG_SYNC 0x00000020 /* all writes synchronous */ 666 #define FS_XFLAG_NOATIME 0x00000040 /* do not update access time */ 667 #define FS_XFLAG_NODUMP 0x00000080 /* do not include in backups */ 668 #define FS_XFLAG_RTINHERIT 0x00000100 /* create with rt bit set */ 669 #define FS_XFLAG_PROJINHERIT 0x00000200 /* create with parents projid */ 670 #define FS_XFLAG_NOSYMLINKS 0x00000400 /* disallow symlink creation */ 671 #define FS_XFLAG_EXTSIZE 0x00000800 /* extent size allocator hint */ 672 #define FS_XFLAG_EXTSZINHERIT 0x00001000 /* inherit inode extent size */ 673 #define FS_XFLAG_NODEFRAG 0x00002000 /* do not defragment */ 674 #define FS_XFLAG_FILESTREAM 0x00004000 /* use filestream allocator */ 675 #define FS_XFLAG_HASATTR 0x80000000 /* no DIFLAG for this */ 676 #endif /* !defined(FS_IOC_FSGETXATTR) */ 677 678 #define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR 679 #define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR 680 681 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 682 /* 683 * ioctl commands in 32 bit emulation 684 */ 685 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 686 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 687 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 688 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 689 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 690 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 691 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 692 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 693 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 694 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 695 #endif 696 697 /* Max physical block we can address w/o extents */ 698 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 699 700 /* 701 * Structure of an inode on the disk 702 */ 703 struct ext4_inode { 704 __le16 i_mode; /* File mode */ 705 __le16 i_uid; /* Low 16 bits of Owner Uid */ 706 __le32 i_size_lo; /* Size in bytes */ 707 __le32 i_atime; /* Access time */ 708 __le32 i_ctime; /* Inode Change time */ 709 __le32 i_mtime; /* Modification time */ 710 __le32 i_dtime; /* Deletion Time */ 711 __le16 i_gid; /* Low 16 bits of Group Id */ 712 __le16 i_links_count; /* Links count */ 713 __le32 i_blocks_lo; /* Blocks count */ 714 __le32 i_flags; /* File flags */ 715 union { 716 struct { 717 __le32 l_i_version; 718 } linux1; 719 struct { 720 __u32 h_i_translator; 721 } hurd1; 722 struct { 723 __u32 m_i_reserved1; 724 } masix1; 725 } osd1; /* OS dependent 1 */ 726 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 727 __le32 i_generation; /* File version (for NFS) */ 728 __le32 i_file_acl_lo; /* File ACL */ 729 __le32 i_size_high; 730 __le32 i_obso_faddr; /* Obsoleted fragment address */ 731 union { 732 struct { 733 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 734 __le16 l_i_file_acl_high; 735 __le16 l_i_uid_high; /* these 2 fields */ 736 __le16 l_i_gid_high; /* were reserved2[0] */ 737 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 738 __le16 l_i_reserved; 739 } linux2; 740 struct { 741 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 742 __u16 h_i_mode_high; 743 __u16 h_i_uid_high; 744 __u16 h_i_gid_high; 745 __u32 h_i_author; 746 } hurd2; 747 struct { 748 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 749 __le16 m_i_file_acl_high; 750 __u32 m_i_reserved2[2]; 751 } masix2; 752 } osd2; /* OS dependent 2 */ 753 __le16 i_extra_isize; 754 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 755 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 756 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 757 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 758 __le32 i_crtime; /* File Creation time */ 759 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 760 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 761 __le32 i_projid; /* Project ID */ 762 }; 763 764 struct move_extent { 765 __u32 reserved; /* should be zero */ 766 __u32 donor_fd; /* donor file descriptor */ 767 __u64 orig_start; /* logical start offset in block for orig */ 768 __u64 donor_start; /* logical start offset in block for donor */ 769 __u64 len; /* block length to be moved */ 770 __u64 moved_len; /* moved block length */ 771 }; 772 773 #define EXT4_EPOCH_BITS 2 774 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 775 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 776 777 /* 778 * Extended fields will fit into an inode if the filesystem was formatted 779 * with large inodes (-I 256 or larger) and there are not currently any EAs 780 * consuming all of the available space. For new inodes we always reserve 781 * enough space for the kernel's known extended fields, but for inodes 782 * created with an old kernel this might not have been the case. None of 783 * the extended inode fields is critical for correct filesystem operation. 784 * This macro checks if a certain field fits in the inode. Note that 785 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 786 */ 787 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 788 ((offsetof(typeof(*ext4_inode), field) + \ 789 sizeof((ext4_inode)->field)) \ 790 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 791 (einode)->i_extra_isize)) \ 792 793 /* 794 * We use an encoding that preserves the times for extra epoch "00": 795 * 796 * extra msb of adjust for signed 797 * epoch 32-bit 32-bit tv_sec to 798 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 799 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 800 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 801 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 802 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 803 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 804 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 805 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 806 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 807 * 808 * Note that previous versions of the kernel on 64-bit systems would 809 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 810 * 1970. e2fsck will correct this, assuming that it is run on the 811 * affected filesystem before 2242. 812 */ 813 814 static inline __le32 ext4_encode_extra_time(struct timespec *time) 815 { 816 u32 extra = sizeof(time->tv_sec) > 4 ? 817 ((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK : 0; 818 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); 819 } 820 821 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 822 { 823 if (unlikely(sizeof(time->tv_sec) > 4 && 824 (extra & cpu_to_le32(EXT4_EPOCH_MASK)))) { 825 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,20,0) 826 /* Handle legacy encoding of pre-1970 dates with epoch 827 * bits 1,1. We assume that by kernel version 4.20, 828 * everyone will have run fsck over the affected 829 * filesystems to correct the problem. (This 830 * backwards compatibility may be removed before this 831 * time, at the discretion of the ext4 developers.) 832 */ 833 u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK; 834 if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0) 835 extra_bits = 0; 836 time->tv_sec += extra_bits << 32; 837 #else 838 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 839 #endif 840 } 841 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 842 } 843 844 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 845 do { \ 846 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 847 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 848 (raw_inode)->xtime ## _extra = \ 849 ext4_encode_extra_time(&(inode)->xtime); \ 850 } while (0) 851 852 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 853 do { \ 854 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 855 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 856 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 857 (raw_inode)->xtime ## _extra = \ 858 ext4_encode_extra_time(&(einode)->xtime); \ 859 } while (0) 860 861 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 862 do { \ 863 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 864 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 865 ext4_decode_extra_time(&(inode)->xtime, \ 866 raw_inode->xtime ## _extra); \ 867 else \ 868 (inode)->xtime.tv_nsec = 0; \ 869 } while (0) 870 871 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 872 do { \ 873 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 874 (einode)->xtime.tv_sec = \ 875 (signed)le32_to_cpu((raw_inode)->xtime); \ 876 else \ 877 (einode)->xtime.tv_sec = 0; \ 878 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 879 ext4_decode_extra_time(&(einode)->xtime, \ 880 raw_inode->xtime ## _extra); \ 881 else \ 882 (einode)->xtime.tv_nsec = 0; \ 883 } while (0) 884 885 #define i_disk_version osd1.linux1.l_i_version 886 887 #if defined(__KERNEL__) || defined(__linux__) 888 #define i_reserved1 osd1.linux1.l_i_reserved1 889 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 890 #define i_blocks_high osd2.linux2.l_i_blocks_high 891 #define i_uid_low i_uid 892 #define i_gid_low i_gid 893 #define i_uid_high osd2.linux2.l_i_uid_high 894 #define i_gid_high osd2.linux2.l_i_gid_high 895 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 896 897 #elif defined(__GNU__) 898 899 #define i_translator osd1.hurd1.h_i_translator 900 #define i_uid_high osd2.hurd2.h_i_uid_high 901 #define i_gid_high osd2.hurd2.h_i_gid_high 902 #define i_author osd2.hurd2.h_i_author 903 904 #elif defined(__masix__) 905 906 #define i_reserved1 osd1.masix1.m_i_reserved1 907 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 908 #define i_reserved2 osd2.masix2.m_i_reserved2 909 910 #endif /* defined(__KERNEL__) || defined(__linux__) */ 911 912 #include "extents_status.h" 913 914 /* 915 * fourth extended file system inode data in memory 916 */ 917 struct ext4_inode_info { 918 __le32 i_data[15]; /* unconverted */ 919 __u32 i_dtime; 920 ext4_fsblk_t i_file_acl; 921 922 /* 923 * i_block_group is the number of the block group which contains 924 * this file's inode. Constant across the lifetime of the inode, 925 * it is ued for making block allocation decisions - we try to 926 * place a file's data blocks near its inode block, and new inodes 927 * near to their parent directory's inode. 928 */ 929 ext4_group_t i_block_group; 930 ext4_lblk_t i_dir_start_lookup; 931 #if (BITS_PER_LONG < 64) 932 unsigned long i_state_flags; /* Dynamic state flags */ 933 #endif 934 unsigned long i_flags; 935 936 /* 937 * Extended attributes can be read independently of the main file 938 * data. Taking i_mutex even when reading would cause contention 939 * between readers of EAs and writers of regular file data, so 940 * instead we synchronize on xattr_sem when reading or changing 941 * EAs. 942 */ 943 struct rw_semaphore xattr_sem; 944 945 struct list_head i_orphan; /* unlinked but open inodes */ 946 947 /* 948 * i_disksize keeps track of what the inode size is ON DISK, not 949 * in memory. During truncate, i_size is set to the new size by 950 * the VFS prior to calling ext4_truncate(), but the filesystem won't 951 * set i_disksize to 0 until the truncate is actually under way. 952 * 953 * The intent is that i_disksize always represents the blocks which 954 * are used by this file. This allows recovery to restart truncate 955 * on orphans if we crash during truncate. We actually write i_disksize 956 * into the on-disk inode when writing inodes out, instead of i_size. 957 * 958 * The only time when i_disksize and i_size may be different is when 959 * a truncate is in progress. The only things which change i_disksize 960 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 961 */ 962 loff_t i_disksize; 963 964 /* 965 * i_data_sem is for serialising ext4_truncate() against 966 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 967 * data tree are chopped off during truncate. We can't do that in 968 * ext4 because whenever we perform intermediate commits during 969 * truncate, the inode and all the metadata blocks *must* be in a 970 * consistent state which allows truncation of the orphans to restart 971 * during recovery. Hence we must fix the get_block-vs-truncate race 972 * by other means, so we have i_data_sem. 973 */ 974 struct rw_semaphore i_data_sem; 975 /* 976 * i_mmap_sem is for serializing page faults with truncate / punch hole 977 * operations. We have to make sure that new page cannot be faulted in 978 * a section of the inode that is being punched. We cannot easily use 979 * i_data_sem for this since we need protection for the whole punch 980 * operation and i_data_sem ranks below transaction start so we have 981 * to occasionally drop it. 982 */ 983 struct rw_semaphore i_mmap_sem; 984 struct inode vfs_inode; 985 struct jbd2_inode *jinode; 986 987 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 988 989 /* 990 * File creation time. Its function is same as that of 991 * struct timespec i_{a,c,m}time in the generic inode. 992 */ 993 struct timespec i_crtime; 994 995 /* mballoc */ 996 struct list_head i_prealloc_list; 997 spinlock_t i_prealloc_lock; 998 999 /* extents status tree */ 1000 struct ext4_es_tree i_es_tree; 1001 rwlock_t i_es_lock; 1002 struct list_head i_es_list; 1003 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1004 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1005 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1006 extents to shrink. Protected by 1007 i_es_lock */ 1008 1009 /* ialloc */ 1010 ext4_group_t i_last_alloc_group; 1011 1012 /* allocation reservation info for delalloc */ 1013 /* In case of bigalloc, these refer to clusters rather than blocks */ 1014 unsigned int i_reserved_data_blocks; 1015 unsigned int i_reserved_meta_blocks; 1016 unsigned int i_allocated_meta_blocks; 1017 ext4_lblk_t i_da_metadata_calc_last_lblock; 1018 int i_da_metadata_calc_len; 1019 1020 /* on-disk additional length */ 1021 __u16 i_extra_isize; 1022 1023 /* Indicate the inline data space. */ 1024 u16 i_inline_off; 1025 u16 i_inline_size; 1026 1027 #ifdef CONFIG_QUOTA 1028 /* quota space reservation, managed internally by quota code */ 1029 qsize_t i_reserved_quota; 1030 #endif 1031 1032 /* Lock protecting lists below */ 1033 spinlock_t i_completed_io_lock; 1034 /* 1035 * Completed IOs that need unwritten extents handling and have 1036 * transaction reserved 1037 */ 1038 struct list_head i_rsv_conversion_list; 1039 struct work_struct i_rsv_conversion_work; 1040 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 1041 1042 spinlock_t i_block_reservation_lock; 1043 1044 /* 1045 * Transactions that contain inode's metadata needed to complete 1046 * fsync and fdatasync, respectively. 1047 */ 1048 tid_t i_sync_tid; 1049 tid_t i_datasync_tid; 1050 1051 #ifdef CONFIG_QUOTA 1052 struct dquot *i_dquot[MAXQUOTAS]; 1053 #endif 1054 1055 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1056 __u32 i_csum_seed; 1057 1058 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1059 /* Encryption params */ 1060 struct ext4_crypt_info *i_crypt_info; 1061 #endif 1062 kprojid_t i_projid; 1063 }; 1064 1065 /* 1066 * File system states 1067 */ 1068 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1069 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1070 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1071 1072 /* 1073 * Misc. filesystem flags 1074 */ 1075 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1076 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1077 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1078 1079 /* 1080 * Mount flags set via mount options or defaults 1081 */ 1082 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1083 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1084 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1085 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1086 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1087 #define EXT4_MOUNT_ERRORS_MASK 0x00070 1088 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1089 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1090 #ifdef CONFIG_FS_DAX 1091 #define EXT4_MOUNT_DAX 0x00200 /* Direct Access */ 1092 #else 1093 #define EXT4_MOUNT_DAX 0 1094 #endif 1095 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1096 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1097 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1098 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1099 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1100 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1101 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1102 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1103 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1104 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1105 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 1106 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 1107 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 1108 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1109 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1110 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1111 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1112 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1113 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1114 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1115 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1116 1117 /* 1118 * Mount flags set either automatically (could not be set by mount option) 1119 * based on per file system feature or property or in special cases such as 1120 * distinguishing between explicit mount option definition and default. 1121 */ 1122 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1123 specified delalloc */ 1124 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1125 size of blocksize * 8 1126 blocks */ 1127 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1128 file systems */ 1129 1130 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1131 specified journal checksum */ 1132 1133 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1134 ~EXT4_MOUNT_##opt 1135 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1136 EXT4_MOUNT_##opt 1137 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1138 EXT4_MOUNT_##opt) 1139 1140 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1141 ~EXT4_MOUNT2_##opt 1142 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1143 EXT4_MOUNT2_##opt 1144 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1145 EXT4_MOUNT2_##opt) 1146 1147 #define ext4_test_and_set_bit __test_and_set_bit_le 1148 #define ext4_set_bit __set_bit_le 1149 #define ext4_set_bit_atomic ext2_set_bit_atomic 1150 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1151 #define ext4_clear_bit __clear_bit_le 1152 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1153 #define ext4_test_bit test_bit_le 1154 #define ext4_find_next_zero_bit find_next_zero_bit_le 1155 #define ext4_find_next_bit find_next_bit_le 1156 1157 extern void ext4_set_bits(void *bm, int cur, int len); 1158 1159 /* 1160 * Maximal mount counts between two filesystem checks 1161 */ 1162 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1163 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1164 1165 /* 1166 * Behaviour when detecting errors 1167 */ 1168 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1169 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1170 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1171 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1172 1173 /* Metadata checksum algorithm codes */ 1174 #define EXT4_CRC32C_CHKSUM 1 1175 1176 /* 1177 * Structure of the super block 1178 */ 1179 struct ext4_super_block { 1180 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1181 __le32 s_blocks_count_lo; /* Blocks count */ 1182 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1183 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1184 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1185 __le32 s_first_data_block; /* First Data Block */ 1186 __le32 s_log_block_size; /* Block size */ 1187 __le32 s_log_cluster_size; /* Allocation cluster size */ 1188 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1189 __le32 s_clusters_per_group; /* # Clusters per group */ 1190 __le32 s_inodes_per_group; /* # Inodes per group */ 1191 __le32 s_mtime; /* Mount time */ 1192 /*30*/ __le32 s_wtime; /* Write time */ 1193 __le16 s_mnt_count; /* Mount count */ 1194 __le16 s_max_mnt_count; /* Maximal mount count */ 1195 __le16 s_magic; /* Magic signature */ 1196 __le16 s_state; /* File system state */ 1197 __le16 s_errors; /* Behaviour when detecting errors */ 1198 __le16 s_minor_rev_level; /* minor revision level */ 1199 /*40*/ __le32 s_lastcheck; /* time of last check */ 1200 __le32 s_checkinterval; /* max. time between checks */ 1201 __le32 s_creator_os; /* OS */ 1202 __le32 s_rev_level; /* Revision level */ 1203 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1204 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1205 /* 1206 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1207 * 1208 * Note: the difference between the compatible feature set and 1209 * the incompatible feature set is that if there is a bit set 1210 * in the incompatible feature set that the kernel doesn't 1211 * know about, it should refuse to mount the filesystem. 1212 * 1213 * e2fsck's requirements are more strict; if it doesn't know 1214 * about a feature in either the compatible or incompatible 1215 * feature set, it must abort and not try to meddle with 1216 * things it doesn't understand... 1217 */ 1218 __le32 s_first_ino; /* First non-reserved inode */ 1219 __le16 s_inode_size; /* size of inode structure */ 1220 __le16 s_block_group_nr; /* block group # of this superblock */ 1221 __le32 s_feature_compat; /* compatible feature set */ 1222 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1223 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1224 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1225 /*78*/ char s_volume_name[16]; /* volume name */ 1226 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 1227 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1228 /* 1229 * Performance hints. Directory preallocation should only 1230 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1231 */ 1232 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1233 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1234 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1235 /* 1236 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1237 */ 1238 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1239 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1240 __le32 s_journal_dev; /* device number of journal file */ 1241 __le32 s_last_orphan; /* start of list of inodes to delete */ 1242 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1243 __u8 s_def_hash_version; /* Default hash version to use */ 1244 __u8 s_jnl_backup_type; 1245 __le16 s_desc_size; /* size of group descriptor */ 1246 /*100*/ __le32 s_default_mount_opts; 1247 __le32 s_first_meta_bg; /* First metablock block group */ 1248 __le32 s_mkfs_time; /* When the filesystem was created */ 1249 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1250 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1251 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1252 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1253 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1254 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1255 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1256 __le32 s_flags; /* Miscellaneous flags */ 1257 __le16 s_raid_stride; /* RAID stride */ 1258 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1259 __le64 s_mmp_block; /* Block for multi-mount protection */ 1260 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1261 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1262 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1263 __u8 s_encryption_level; /* versioning level for encryption */ 1264 __u8 s_reserved_pad; /* Padding to next 32bits */ 1265 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1266 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1267 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1268 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1269 snapshot's future use */ 1270 __le32 s_snapshot_list; /* inode number of the head of the 1271 on-disk snapshot list */ 1272 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1273 __le32 s_error_count; /* number of fs errors */ 1274 __le32 s_first_error_time; /* first time an error happened */ 1275 __le32 s_first_error_ino; /* inode involved in first error */ 1276 __le64 s_first_error_block; /* block involved of first error */ 1277 __u8 s_first_error_func[32]; /* function where the error happened */ 1278 __le32 s_first_error_line; /* line number where error happened */ 1279 __le32 s_last_error_time; /* most recent time of an error */ 1280 __le32 s_last_error_ino; /* inode involved in last error */ 1281 __le32 s_last_error_line; /* line number where error happened */ 1282 __le64 s_last_error_block; /* block involved of last error */ 1283 __u8 s_last_error_func[32]; /* function where the error happened */ 1284 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1285 __u8 s_mount_opts[64]; 1286 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1287 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1288 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1289 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1290 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1291 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1292 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1293 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1294 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1295 __le32 s_reserved[98]; /* Padding to the end of the block */ 1296 __le32 s_checksum; /* crc32c(superblock) */ 1297 }; 1298 1299 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1300 1301 #ifdef __KERNEL__ 1302 1303 /* 1304 * run-time mount flags 1305 */ 1306 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1307 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1308 #define EXT4_MF_TEST_DUMMY_ENCRYPTION 0x0004 1309 1310 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1311 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \ 1312 EXT4_MF_TEST_DUMMY_ENCRYPTION)) 1313 #else 1314 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0) 1315 #endif 1316 1317 /* Number of quota types we support */ 1318 #define EXT4_MAXQUOTAS 3 1319 1320 /* 1321 * fourth extended-fs super-block data in memory 1322 */ 1323 struct ext4_sb_info { 1324 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1325 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1326 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1327 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1328 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1329 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1330 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1331 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1332 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1333 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1334 unsigned long s_overhead; /* # of fs overhead clusters */ 1335 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1336 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1337 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1338 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1339 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1340 struct buffer_head **s_group_desc; 1341 unsigned int s_mount_opt; 1342 unsigned int s_mount_opt2; 1343 unsigned int s_mount_flags; 1344 unsigned int s_def_mount_opt; 1345 ext4_fsblk_t s_sb_block; 1346 atomic64_t s_resv_clusters; 1347 kuid_t s_resuid; 1348 kgid_t s_resgid; 1349 unsigned short s_mount_state; 1350 unsigned short s_pad; 1351 int s_addr_per_block_bits; 1352 int s_desc_per_block_bits; 1353 int s_inode_size; 1354 int s_first_ino; 1355 unsigned int s_inode_readahead_blks; 1356 unsigned int s_inode_goal; 1357 spinlock_t s_next_gen_lock; 1358 u32 s_next_generation; 1359 u32 s_hash_seed[4]; 1360 int s_def_hash_version; 1361 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1362 struct percpu_counter s_freeclusters_counter; 1363 struct percpu_counter s_freeinodes_counter; 1364 struct percpu_counter s_dirs_counter; 1365 struct percpu_counter s_dirtyclusters_counter; 1366 struct blockgroup_lock *s_blockgroup_lock; 1367 struct proc_dir_entry *s_proc; 1368 struct kobject s_kobj; 1369 struct completion s_kobj_unregister; 1370 struct super_block *s_sb; 1371 1372 /* Journaling */ 1373 struct journal_s *s_journal; 1374 struct list_head s_orphan; 1375 struct mutex s_orphan_lock; 1376 unsigned long s_resize_flags; /* Flags indicating if there 1377 is a resizer */ 1378 unsigned long s_commit_interval; 1379 u32 s_max_batch_time; 1380 u32 s_min_batch_time; 1381 struct block_device *journal_bdev; 1382 #ifdef CONFIG_QUOTA 1383 char *s_qf_names[EXT4_MAXQUOTAS]; /* Names of quota files with journalled quota */ 1384 int s_jquota_fmt; /* Format of quota to use */ 1385 #endif 1386 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1387 struct rb_root system_blks; 1388 1389 #ifdef EXTENTS_STATS 1390 /* ext4 extents stats */ 1391 unsigned long s_ext_min; 1392 unsigned long s_ext_max; 1393 unsigned long s_depth_max; 1394 spinlock_t s_ext_stats_lock; 1395 unsigned long s_ext_blocks; 1396 unsigned long s_ext_extents; 1397 #endif 1398 1399 /* for buddy allocator */ 1400 struct ext4_group_info ***s_group_info; 1401 struct inode *s_buddy_cache; 1402 spinlock_t s_md_lock; 1403 unsigned short *s_mb_offsets; 1404 unsigned int *s_mb_maxs; 1405 unsigned int s_group_info_size; 1406 1407 /* tunables */ 1408 unsigned long s_stripe; 1409 unsigned int s_mb_stream_request; 1410 unsigned int s_mb_max_to_scan; 1411 unsigned int s_mb_min_to_scan; 1412 unsigned int s_mb_stats; 1413 unsigned int s_mb_order2_reqs; 1414 unsigned int s_mb_group_prealloc; 1415 unsigned int s_max_dir_size_kb; 1416 /* where last allocation was done - for stream allocation */ 1417 unsigned long s_mb_last_group; 1418 unsigned long s_mb_last_start; 1419 1420 /* stats for buddy allocator */ 1421 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1422 atomic_t s_bal_success; /* we found long enough chunks */ 1423 atomic_t s_bal_allocated; /* in blocks */ 1424 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1425 atomic_t s_bal_goals; /* goal hits */ 1426 atomic_t s_bal_breaks; /* too long searches */ 1427 atomic_t s_bal_2orders; /* 2^order hits */ 1428 spinlock_t s_bal_lock; 1429 unsigned long s_mb_buddies_generated; 1430 unsigned long long s_mb_generation_time; 1431 atomic_t s_mb_lost_chunks; 1432 atomic_t s_mb_preallocated; 1433 atomic_t s_mb_discarded; 1434 atomic_t s_lock_busy; 1435 1436 /* locality groups */ 1437 struct ext4_locality_group __percpu *s_locality_groups; 1438 1439 /* for write statistics */ 1440 unsigned long s_sectors_written_start; 1441 u64 s_kbytes_written; 1442 1443 /* the size of zero-out chunk */ 1444 unsigned int s_extent_max_zeroout_kb; 1445 1446 unsigned int s_log_groups_per_flex; 1447 struct flex_groups *s_flex_groups; 1448 ext4_group_t s_flex_groups_allocated; 1449 1450 /* workqueue for reserved extent conversions (buffered io) */ 1451 struct workqueue_struct *rsv_conversion_wq; 1452 1453 /* timer for periodic error stats printing */ 1454 struct timer_list s_err_report; 1455 1456 /* Lazy inode table initialization info */ 1457 struct ext4_li_request *s_li_request; 1458 /* Wait multiplier for lazy initialization thread */ 1459 unsigned int s_li_wait_mult; 1460 1461 /* Kernel thread for multiple mount protection */ 1462 struct task_struct *s_mmp_tsk; 1463 1464 /* record the last minlen when FITRIM is called. */ 1465 atomic_t s_last_trim_minblks; 1466 1467 /* Reference to checksum algorithm driver via cryptoapi */ 1468 struct crypto_shash *s_chksum_driver; 1469 1470 /* Precomputed FS UUID checksum for seeding other checksums */ 1471 __u32 s_csum_seed; 1472 1473 /* Reclaim extents from extent status tree */ 1474 struct shrinker s_es_shrinker; 1475 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1476 long s_es_nr_inode; 1477 struct ext4_es_stats s_es_stats; 1478 struct mb_cache *s_mb_cache; 1479 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1480 1481 /* Ratelimit ext4 messages. */ 1482 struct ratelimit_state s_err_ratelimit_state; 1483 struct ratelimit_state s_warning_ratelimit_state; 1484 struct ratelimit_state s_msg_ratelimit_state; 1485 }; 1486 1487 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1488 { 1489 return sb->s_fs_info; 1490 } 1491 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1492 { 1493 return container_of(inode, struct ext4_inode_info, vfs_inode); 1494 } 1495 1496 static inline struct timespec ext4_current_time(struct inode *inode) 1497 { 1498 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1499 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1500 } 1501 1502 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1503 { 1504 return ino == EXT4_ROOT_INO || 1505 ino == EXT4_USR_QUOTA_INO || 1506 ino == EXT4_GRP_QUOTA_INO || 1507 ino == EXT4_BOOT_LOADER_INO || 1508 ino == EXT4_JOURNAL_INO || 1509 ino == EXT4_RESIZE_INO || 1510 (ino >= EXT4_FIRST_INO(sb) && 1511 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1512 } 1513 1514 /* 1515 * Inode dynamic state flags 1516 */ 1517 enum { 1518 EXT4_STATE_JDATA, /* journaled data exists */ 1519 EXT4_STATE_NEW, /* inode is newly created */ 1520 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1521 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1522 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1523 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1524 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1525 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1526 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read 1527 nolocking */ 1528 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1529 EXT4_STATE_ORDERED_MODE, /* data=ordered mode */ 1530 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1531 }; 1532 1533 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1534 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1535 { \ 1536 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1537 } \ 1538 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1539 { \ 1540 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1541 } \ 1542 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1543 { \ 1544 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1545 } 1546 1547 /* Add these declarations here only so that these functions can be 1548 * found by name. Otherwise, they are very hard to locate. */ 1549 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1550 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1551 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1552 EXT4_INODE_BIT_FNS(flag, flags, 0) 1553 1554 /* Add these declarations here only so that these functions can be 1555 * found by name. Otherwise, they are very hard to locate. */ 1556 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1557 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1558 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1559 #if (BITS_PER_LONG < 64) 1560 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1561 1562 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1563 { 1564 (ei)->i_state_flags = 0; 1565 } 1566 #else 1567 EXT4_INODE_BIT_FNS(state, flags, 32) 1568 1569 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1570 { 1571 /* We depend on the fact that callers will set i_flags */ 1572 } 1573 #endif 1574 #else 1575 /* Assume that user mode programs are passing in an ext4fs superblock, not 1576 * a kernel struct super_block. This will allow us to call the feature-test 1577 * macros from user land. */ 1578 #define EXT4_SB(sb) (sb) 1579 #endif 1580 1581 /* 1582 * Returns true if the inode is inode is encrypted 1583 */ 1584 static inline int ext4_encrypted_inode(struct inode *inode) 1585 { 1586 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1587 return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT); 1588 #else 1589 return 0; 1590 #endif 1591 } 1592 1593 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1594 1595 /* 1596 * Codes for operating systems 1597 */ 1598 #define EXT4_OS_LINUX 0 1599 #define EXT4_OS_HURD 1 1600 #define EXT4_OS_MASIX 2 1601 #define EXT4_OS_FREEBSD 3 1602 #define EXT4_OS_LITES 4 1603 1604 /* 1605 * Revision levels 1606 */ 1607 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1608 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1609 1610 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1611 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1612 1613 #define EXT4_GOOD_OLD_INODE_SIZE 128 1614 1615 /* 1616 * Feature set definitions 1617 */ 1618 1619 /* Use the ext4_{has,set,clear}_feature_* helpers; these will be removed */ 1620 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1621 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1622 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1623 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1624 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1625 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1626 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1627 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1628 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1629 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1630 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1631 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1632 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1633 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1634 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1635 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1636 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1637 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1638 1639 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1640 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1641 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1642 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1643 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1644 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1645 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1646 1647 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1648 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1649 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1650 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1651 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1652 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1653 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1654 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1655 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1656 /* 1657 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1658 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1659 * all other data structures' checksums. However, the METADATA_CSUM and 1660 * GDT_CSUM bits are mutually exclusive. 1661 */ 1662 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1663 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1664 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 1665 1666 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1667 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1668 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1669 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1670 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1671 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1672 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1673 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1674 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1675 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1676 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1677 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 1678 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1679 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1680 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1681 1682 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 1683 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1684 { \ 1685 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1686 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 1687 } \ 1688 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1689 { \ 1690 EXT4_SB(sb)->s_es->s_feature_compat |= \ 1691 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1692 } \ 1693 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1694 { \ 1695 EXT4_SB(sb)->s_es->s_feature_compat &= \ 1696 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1697 } 1698 1699 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 1700 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1701 { \ 1702 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1703 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 1704 } \ 1705 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1706 { \ 1707 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 1708 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1709 } \ 1710 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1711 { \ 1712 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 1713 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1714 } 1715 1716 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 1717 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1718 { \ 1719 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1720 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 1721 } \ 1722 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1723 { \ 1724 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 1725 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1726 } \ 1727 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1728 { \ 1729 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 1730 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1731 } 1732 1733 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 1734 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 1735 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 1736 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 1737 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 1738 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 1739 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 1740 1741 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 1742 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 1743 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 1744 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 1745 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 1746 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 1747 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 1748 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 1749 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 1750 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 1751 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 1752 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 1753 1754 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 1755 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 1756 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 1757 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 1758 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 1759 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 1760 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 1761 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 1762 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 1763 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 1764 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 1765 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 1766 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 1767 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 1768 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 1769 1770 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1771 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1772 EXT4_FEATURE_INCOMPAT_META_BG) 1773 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1774 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1775 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1776 1777 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1778 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1779 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1780 EXT4_FEATURE_INCOMPAT_META_BG) 1781 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1782 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1783 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1784 1785 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1786 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1787 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1788 EXT4_FEATURE_INCOMPAT_META_BG| \ 1789 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1790 EXT4_FEATURE_INCOMPAT_64BIT| \ 1791 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1792 EXT4_FEATURE_INCOMPAT_MMP | \ 1793 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 1794 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 1795 EXT4_FEATURE_INCOMPAT_CSUM_SEED) 1796 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1797 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1798 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1799 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1800 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1801 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1802 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1803 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1804 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1805 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 1806 EXT4_FEATURE_RO_COMPAT_PROJECT) 1807 1808 #define EXTN_FEATURE_FUNCS(ver) \ 1809 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 1810 { \ 1811 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1812 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 1813 } \ 1814 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 1815 { \ 1816 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1817 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 1818 } \ 1819 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 1820 { \ 1821 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1822 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 1823 } 1824 1825 EXTN_FEATURE_FUNCS(2) 1826 EXTN_FEATURE_FUNCS(3) 1827 EXTN_FEATURE_FUNCS(4) 1828 1829 static inline bool ext4_has_compat_features(struct super_block *sb) 1830 { 1831 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 1832 } 1833 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 1834 { 1835 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 1836 } 1837 static inline bool ext4_has_incompat_features(struct super_block *sb) 1838 { 1839 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 1840 } 1841 1842 /* 1843 * Default values for user and/or group using reserved blocks 1844 */ 1845 #define EXT4_DEF_RESUID 0 1846 #define EXT4_DEF_RESGID 0 1847 1848 /* 1849 * Default project ID 1850 */ 1851 #define EXT4_DEF_PROJID 0 1852 1853 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1854 1855 /* 1856 * Default mount options 1857 */ 1858 #define EXT4_DEFM_DEBUG 0x0001 1859 #define EXT4_DEFM_BSDGROUPS 0x0002 1860 #define EXT4_DEFM_XATTR_USER 0x0004 1861 #define EXT4_DEFM_ACL 0x0008 1862 #define EXT4_DEFM_UID16 0x0010 1863 #define EXT4_DEFM_JMODE 0x0060 1864 #define EXT4_DEFM_JMODE_DATA 0x0020 1865 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1866 #define EXT4_DEFM_JMODE_WBACK 0x0060 1867 #define EXT4_DEFM_NOBARRIER 0x0100 1868 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1869 #define EXT4_DEFM_DISCARD 0x0400 1870 #define EXT4_DEFM_NODELALLOC 0x0800 1871 1872 /* 1873 * Default journal batch times 1874 */ 1875 #define EXT4_DEF_MIN_BATCH_TIME 0 1876 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1877 1878 /* 1879 * Minimum number of groups in a flexgroup before we separate out 1880 * directories into the first block group of a flexgroup 1881 */ 1882 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1883 1884 /* 1885 * Structure of a directory entry 1886 */ 1887 #define EXT4_NAME_LEN 255 1888 1889 struct ext4_dir_entry { 1890 __le32 inode; /* Inode number */ 1891 __le16 rec_len; /* Directory entry length */ 1892 __le16 name_len; /* Name length */ 1893 char name[EXT4_NAME_LEN]; /* File name */ 1894 }; 1895 1896 /* 1897 * The new version of the directory entry. Since EXT4 structures are 1898 * stored in intel byte order, and the name_len field could never be 1899 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1900 * file_type field. 1901 */ 1902 struct ext4_dir_entry_2 { 1903 __le32 inode; /* Inode number */ 1904 __le16 rec_len; /* Directory entry length */ 1905 __u8 name_len; /* Name length */ 1906 __u8 file_type; 1907 char name[EXT4_NAME_LEN]; /* File name */ 1908 }; 1909 1910 /* 1911 * This is a bogus directory entry at the end of each leaf block that 1912 * records checksums. 1913 */ 1914 struct ext4_dir_entry_tail { 1915 __le32 det_reserved_zero1; /* Pretend to be unused */ 1916 __le16 det_rec_len; /* 12 */ 1917 __u8 det_reserved_zero2; /* Zero name length */ 1918 __u8 det_reserved_ft; /* 0xDE, fake file type */ 1919 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1920 }; 1921 1922 #define EXT4_DIRENT_TAIL(block, blocksize) \ 1923 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 1924 ((blocksize) - \ 1925 sizeof(struct ext4_dir_entry_tail)))) 1926 1927 /* 1928 * Ext4 directory file types. Only the low 3 bits are used. The 1929 * other bits are reserved for now. 1930 */ 1931 #define EXT4_FT_UNKNOWN 0 1932 #define EXT4_FT_REG_FILE 1 1933 #define EXT4_FT_DIR 2 1934 #define EXT4_FT_CHRDEV 3 1935 #define EXT4_FT_BLKDEV 4 1936 #define EXT4_FT_FIFO 5 1937 #define EXT4_FT_SOCK 6 1938 #define EXT4_FT_SYMLINK 7 1939 1940 #define EXT4_FT_MAX 8 1941 1942 #define EXT4_FT_DIR_CSUM 0xDE 1943 1944 /* 1945 * EXT4_DIR_PAD defines the directory entries boundaries 1946 * 1947 * NOTE: It must be a multiple of 4 1948 */ 1949 #define EXT4_DIR_PAD 4 1950 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1951 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1952 ~EXT4_DIR_ROUND) 1953 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1954 1955 /* 1956 * If we ever get support for fs block sizes > page_size, we'll need 1957 * to remove the #if statements in the next two functions... 1958 */ 1959 static inline unsigned int 1960 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1961 { 1962 unsigned len = le16_to_cpu(dlen); 1963 1964 #if (PAGE_CACHE_SIZE >= 65536) 1965 if (len == EXT4_MAX_REC_LEN || len == 0) 1966 return blocksize; 1967 return (len & 65532) | ((len & 3) << 16); 1968 #else 1969 return len; 1970 #endif 1971 } 1972 1973 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1974 { 1975 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1976 BUG(); 1977 #if (PAGE_CACHE_SIZE >= 65536) 1978 if (len < 65536) 1979 return cpu_to_le16(len); 1980 if (len == blocksize) { 1981 if (blocksize == 65536) 1982 return cpu_to_le16(EXT4_MAX_REC_LEN); 1983 else 1984 return cpu_to_le16(0); 1985 } 1986 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 1987 #else 1988 return cpu_to_le16(len); 1989 #endif 1990 } 1991 1992 /* 1993 * Hash Tree Directory indexing 1994 * (c) Daniel Phillips, 2001 1995 */ 1996 1997 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 1998 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 1999 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 2000 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2001 2002 /* Legal values for the dx_root hash_version field: */ 2003 2004 #define DX_HASH_LEGACY 0 2005 #define DX_HASH_HALF_MD4 1 2006 #define DX_HASH_TEA 2 2007 #define DX_HASH_LEGACY_UNSIGNED 3 2008 #define DX_HASH_HALF_MD4_UNSIGNED 4 2009 #define DX_HASH_TEA_UNSIGNED 5 2010 2011 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 2012 const void *address, unsigned int length) 2013 { 2014 struct { 2015 struct shash_desc shash; 2016 char ctx[4]; 2017 } desc; 2018 int err; 2019 2020 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2021 2022 desc.shash.tfm = sbi->s_chksum_driver; 2023 desc.shash.flags = 0; 2024 *(u32 *)desc.ctx = crc; 2025 2026 err = crypto_shash_update(&desc.shash, address, length); 2027 BUG_ON(err); 2028 2029 return *(u32 *)desc.ctx; 2030 } 2031 2032 #ifdef __KERNEL__ 2033 2034 /* hash info structure used by the directory hash */ 2035 struct dx_hash_info 2036 { 2037 u32 hash; 2038 u32 minor_hash; 2039 int hash_version; 2040 u32 *seed; 2041 }; 2042 2043 2044 /* 32 and 64 bit signed EOF for dx directories */ 2045 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2046 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2047 2048 2049 /* 2050 * Control parameters used by ext4_htree_next_block 2051 */ 2052 #define HASH_NB_ALWAYS 1 2053 2054 struct ext4_filename { 2055 const struct qstr *usr_fname; 2056 struct ext4_str disk_name; 2057 struct dx_hash_info hinfo; 2058 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2059 struct ext4_str crypto_buf; 2060 #endif 2061 }; 2062 2063 #define fname_name(p) ((p)->disk_name.name) 2064 #define fname_len(p) ((p)->disk_name.len) 2065 2066 /* 2067 * Describe an inode's exact location on disk and in memory 2068 */ 2069 struct ext4_iloc 2070 { 2071 struct buffer_head *bh; 2072 unsigned long offset; 2073 ext4_group_t block_group; 2074 }; 2075 2076 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2077 { 2078 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2079 } 2080 2081 /* 2082 * This structure is stuffed into the struct file's private_data field 2083 * for directories. It is where we put information so that we can do 2084 * readdir operations in hash tree order. 2085 */ 2086 struct dir_private_info { 2087 struct rb_root root; 2088 struct rb_node *curr_node; 2089 struct fname *extra_fname; 2090 loff_t last_pos; 2091 __u32 curr_hash; 2092 __u32 curr_minor_hash; 2093 __u32 next_hash; 2094 }; 2095 2096 /* calculate the first block number of the group */ 2097 static inline ext4_fsblk_t 2098 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2099 { 2100 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2101 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2102 } 2103 2104 /* 2105 * Special error return code only used by dx_probe() and its callers. 2106 */ 2107 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2108 2109 /* 2110 * Timeout and state flag for lazy initialization inode thread. 2111 */ 2112 #define EXT4_DEF_LI_WAIT_MULT 10 2113 #define EXT4_DEF_LI_MAX_START_DELAY 5 2114 #define EXT4_LAZYINIT_QUIT 0x0001 2115 #define EXT4_LAZYINIT_RUNNING 0x0002 2116 2117 /* 2118 * Lazy inode table initialization info 2119 */ 2120 struct ext4_lazy_init { 2121 unsigned long li_state; 2122 struct list_head li_request_list; 2123 struct mutex li_list_mtx; 2124 }; 2125 2126 struct ext4_li_request { 2127 struct super_block *lr_super; 2128 struct ext4_sb_info *lr_sbi; 2129 ext4_group_t lr_next_group; 2130 struct list_head lr_request; 2131 unsigned long lr_next_sched; 2132 unsigned long lr_timeout; 2133 }; 2134 2135 struct ext4_features { 2136 struct kobject f_kobj; 2137 struct completion f_kobj_unregister; 2138 }; 2139 2140 /* 2141 * This structure will be used for multiple mount protection. It will be 2142 * written into the block number saved in the s_mmp_block field in the 2143 * superblock. Programs that check MMP should assume that if 2144 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2145 * to use the filesystem, regardless of how old the timestamp is. 2146 */ 2147 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2148 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2149 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2150 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2151 2152 struct mmp_struct { 2153 __le32 mmp_magic; /* Magic number for MMP */ 2154 __le32 mmp_seq; /* Sequence no. updated periodically */ 2155 2156 /* 2157 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2158 * purposes and do not affect the correctness of the algorithm 2159 */ 2160 __le64 mmp_time; /* Time last updated */ 2161 char mmp_nodename[64]; /* Node which last updated MMP block */ 2162 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2163 2164 /* 2165 * mmp_check_interval is used to verify if the MMP block has been 2166 * updated on the block device. The value is updated based on the 2167 * maximum time to write the MMP block during an update cycle. 2168 */ 2169 __le16 mmp_check_interval; 2170 2171 __le16 mmp_pad1; 2172 __le32 mmp_pad2[226]; 2173 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2174 }; 2175 2176 /* arguments passed to the mmp thread */ 2177 struct mmpd_data { 2178 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2179 struct super_block *sb; /* super block of the fs */ 2180 }; 2181 2182 /* 2183 * Check interval multiplier 2184 * The MMP block is written every update interval and initially checked every 2185 * update interval x the multiplier (the value is then adapted based on the 2186 * write latency). The reason is that writes can be delayed under load and we 2187 * don't want readers to incorrectly assume that the filesystem is no longer 2188 * in use. 2189 */ 2190 #define EXT4_MMP_CHECK_MULT 2UL 2191 2192 /* 2193 * Minimum interval for MMP checking in seconds. 2194 */ 2195 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2196 2197 /* 2198 * Maximum interval for MMP checking in seconds. 2199 */ 2200 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2201 2202 /* 2203 * Function prototypes 2204 */ 2205 2206 /* 2207 * Ok, these declarations are also in <linux/kernel.h> but none of the 2208 * ext4 source programs needs to include it so they are duplicated here. 2209 */ 2210 # define NORET_TYPE /**/ 2211 # define ATTRIB_NORET __attribute__((noreturn)) 2212 # define NORET_AND noreturn, 2213 2214 /* bitmap.c */ 2215 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2216 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2217 struct ext4_group_desc *gdp, 2218 struct buffer_head *bh, int sz); 2219 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2220 struct ext4_group_desc *gdp, 2221 struct buffer_head *bh, int sz); 2222 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2223 struct ext4_group_desc *gdp, 2224 struct buffer_head *bh); 2225 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2226 struct ext4_group_desc *gdp, 2227 struct buffer_head *bh); 2228 2229 /* balloc.c */ 2230 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2231 ext4_fsblk_t blocknr, 2232 ext4_group_t *blockgrpp, 2233 ext4_grpblk_t *offsetp); 2234 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2235 ext4_fsblk_t block); 2236 2237 extern unsigned int ext4_block_group(struct super_block *sb, 2238 ext4_fsblk_t blocknr); 2239 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2240 ext4_fsblk_t blocknr); 2241 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2242 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2243 ext4_group_t group); 2244 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2245 ext4_fsblk_t goal, 2246 unsigned int flags, 2247 unsigned long *count, 2248 int *errp); 2249 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2250 s64 nclusters, unsigned int flags); 2251 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2252 extern void ext4_check_blocks_bitmap(struct super_block *); 2253 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2254 ext4_group_t block_group, 2255 struct buffer_head ** bh); 2256 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2257 2258 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2259 ext4_group_t block_group); 2260 extern int ext4_wait_block_bitmap(struct super_block *sb, 2261 ext4_group_t block_group, 2262 struct buffer_head *bh); 2263 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2264 ext4_group_t block_group); 2265 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2266 ext4_group_t block_group, 2267 struct ext4_group_desc *gdp); 2268 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2269 2270 /* crypto_policy.c */ 2271 int ext4_is_child_context_consistent_with_parent(struct inode *parent, 2272 struct inode *child); 2273 int ext4_inherit_context(struct inode *parent, struct inode *child); 2274 void ext4_to_hex(char *dst, char *src, size_t src_size); 2275 int ext4_process_policy(const struct ext4_encryption_policy *policy, 2276 struct inode *inode); 2277 int ext4_get_policy(struct inode *inode, 2278 struct ext4_encryption_policy *policy); 2279 2280 /* crypto.c */ 2281 extern struct kmem_cache *ext4_crypt_info_cachep; 2282 bool ext4_valid_contents_enc_mode(uint32_t mode); 2283 uint32_t ext4_validate_encryption_key_size(uint32_t mode, uint32_t size); 2284 extern struct workqueue_struct *ext4_read_workqueue; 2285 struct ext4_crypto_ctx *ext4_get_crypto_ctx(struct inode *inode); 2286 void ext4_release_crypto_ctx(struct ext4_crypto_ctx *ctx); 2287 void ext4_restore_control_page(struct page *data_page); 2288 struct page *ext4_encrypt(struct inode *inode, 2289 struct page *plaintext_page); 2290 int ext4_decrypt(struct page *page); 2291 int ext4_encrypted_zeroout(struct inode *inode, ext4_lblk_t lblk, 2292 ext4_fsblk_t pblk, ext4_lblk_t len); 2293 extern const struct dentry_operations ext4_encrypted_d_ops; 2294 2295 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2296 int ext4_init_crypto(void); 2297 void ext4_exit_crypto(void); 2298 static inline int ext4_sb_has_crypto(struct super_block *sb) 2299 { 2300 return ext4_has_feature_encrypt(sb); 2301 } 2302 #else 2303 static inline int ext4_init_crypto(void) { return 0; } 2304 static inline void ext4_exit_crypto(void) { } 2305 static inline int ext4_sb_has_crypto(struct super_block *sb) 2306 { 2307 return 0; 2308 } 2309 #endif 2310 2311 /* crypto_fname.c */ 2312 bool ext4_valid_filenames_enc_mode(uint32_t mode); 2313 u32 ext4_fname_crypto_round_up(u32 size, u32 blksize); 2314 unsigned ext4_fname_encrypted_size(struct inode *inode, u32 ilen); 2315 int ext4_fname_crypto_alloc_buffer(struct inode *inode, 2316 u32 ilen, struct ext4_str *crypto_str); 2317 int _ext4_fname_disk_to_usr(struct inode *inode, 2318 struct dx_hash_info *hinfo, 2319 const struct ext4_str *iname, 2320 struct ext4_str *oname); 2321 int ext4_fname_disk_to_usr(struct inode *inode, 2322 struct dx_hash_info *hinfo, 2323 const struct ext4_dir_entry_2 *de, 2324 struct ext4_str *oname); 2325 int ext4_fname_usr_to_disk(struct inode *inode, 2326 const struct qstr *iname, 2327 struct ext4_str *oname); 2328 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2329 void ext4_fname_crypto_free_buffer(struct ext4_str *crypto_str); 2330 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname, 2331 int lookup, struct ext4_filename *fname); 2332 void ext4_fname_free_filename(struct ext4_filename *fname); 2333 #else 2334 static inline 2335 int ext4_setup_fname_crypto(struct inode *inode) 2336 { 2337 return 0; 2338 } 2339 static inline void ext4_fname_crypto_free_buffer(struct ext4_str *p) { } 2340 static inline int ext4_fname_setup_filename(struct inode *dir, 2341 const struct qstr *iname, 2342 int lookup, struct ext4_filename *fname) 2343 { 2344 fname->usr_fname = iname; 2345 fname->disk_name.name = (unsigned char *) iname->name; 2346 fname->disk_name.len = iname->len; 2347 return 0; 2348 } 2349 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { } 2350 #endif 2351 2352 2353 /* crypto_key.c */ 2354 void ext4_free_crypt_info(struct ext4_crypt_info *ci); 2355 void ext4_free_encryption_info(struct inode *inode, struct ext4_crypt_info *ci); 2356 int _ext4_get_encryption_info(struct inode *inode); 2357 2358 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2359 int ext4_has_encryption_key(struct inode *inode); 2360 2361 static inline int ext4_get_encryption_info(struct inode *inode) 2362 { 2363 struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info; 2364 2365 if (!ci || 2366 (ci->ci_keyring_key && 2367 (ci->ci_keyring_key->flags & ((1 << KEY_FLAG_INVALIDATED) | 2368 (1 << KEY_FLAG_REVOKED) | 2369 (1 << KEY_FLAG_DEAD))))) 2370 return _ext4_get_encryption_info(inode); 2371 return 0; 2372 } 2373 2374 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode) 2375 { 2376 return EXT4_I(inode)->i_crypt_info; 2377 } 2378 2379 #else 2380 static inline int ext4_has_encryption_key(struct inode *inode) 2381 { 2382 return 0; 2383 } 2384 static inline int ext4_get_encryption_info(struct inode *inode) 2385 { 2386 return 0; 2387 } 2388 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode) 2389 { 2390 return NULL; 2391 } 2392 #endif 2393 2394 2395 /* dir.c */ 2396 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2397 struct file *, 2398 struct ext4_dir_entry_2 *, 2399 struct buffer_head *, char *, int, 2400 unsigned int); 2401 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2402 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2403 (de), (bh), (buf), (size), (offset))) 2404 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2405 __u32 minor_hash, 2406 struct ext4_dir_entry_2 *dirent, 2407 struct ext4_str *ent_name); 2408 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2409 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2410 struct buffer_head *bh, 2411 void *buf, int buf_size, 2412 struct ext4_filename *fname, 2413 struct ext4_dir_entry_2 **dest_de); 2414 int ext4_insert_dentry(struct inode *dir, 2415 struct inode *inode, 2416 struct ext4_dir_entry_2 *de, 2417 int buf_size, 2418 struct ext4_filename *fname); 2419 static inline void ext4_update_dx_flag(struct inode *inode) 2420 { 2421 if (!ext4_has_feature_dir_index(inode->i_sb)) 2422 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2423 } 2424 static unsigned char ext4_filetype_table[] = { 2425 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2426 }; 2427 2428 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2429 { 2430 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2431 return DT_UNKNOWN; 2432 2433 return ext4_filetype_table[filetype]; 2434 } 2435 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2436 void *buf, int buf_size); 2437 2438 /* fsync.c */ 2439 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2440 2441 /* hash.c */ 2442 extern int ext4fs_dirhash(const char *name, int len, struct 2443 dx_hash_info *hinfo); 2444 2445 /* ialloc.c */ 2446 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2447 const struct qstr *qstr, __u32 goal, 2448 uid_t *owner, int handle_type, 2449 unsigned int line_no, int nblocks); 2450 2451 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \ 2452 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2453 0, 0, 0) 2454 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2455 type, nblocks) \ 2456 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2457 (type), __LINE__, (nblocks)) 2458 2459 2460 extern void ext4_free_inode(handle_t *, struct inode *); 2461 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2462 extern unsigned long ext4_count_free_inodes(struct super_block *); 2463 extern unsigned long ext4_count_dirs(struct super_block *); 2464 extern void ext4_check_inodes_bitmap(struct super_block *); 2465 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2466 extern int ext4_init_inode_table(struct super_block *sb, 2467 ext4_group_t group, int barrier); 2468 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2469 2470 /* mballoc.c */ 2471 extern const struct file_operations ext4_seq_mb_groups_fops; 2472 extern long ext4_mb_stats; 2473 extern long ext4_mb_max_to_scan; 2474 extern int ext4_mb_init(struct super_block *); 2475 extern int ext4_mb_release(struct super_block *); 2476 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2477 struct ext4_allocation_request *, int *); 2478 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2479 extern void ext4_discard_preallocations(struct inode *); 2480 extern int __init ext4_init_mballoc(void); 2481 extern void ext4_exit_mballoc(void); 2482 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2483 struct buffer_head *bh, ext4_fsblk_t block, 2484 unsigned long count, int flags); 2485 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2486 ext4_group_t ngroups); 2487 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2488 ext4_group_t i, struct ext4_group_desc *desc); 2489 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2490 ext4_fsblk_t block, unsigned long count); 2491 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2492 2493 /* inode.c */ 2494 int ext4_inode_is_fast_symlink(struct inode *inode); 2495 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2496 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2497 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2498 struct buffer_head *bh_result, int create); 2499 int ext4_dax_mmap_get_block(struct inode *inode, sector_t iblock, 2500 struct buffer_head *bh_result, int create); 2501 int ext4_get_block(struct inode *inode, sector_t iblock, 2502 struct buffer_head *bh_result, int create); 2503 int ext4_dio_get_block(struct inode *inode, sector_t iblock, 2504 struct buffer_head *bh_result, int create); 2505 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2506 struct buffer_head *bh, int create); 2507 int ext4_walk_page_buffers(handle_t *handle, 2508 struct buffer_head *head, 2509 unsigned from, 2510 unsigned to, 2511 int *partial, 2512 int (*fn)(handle_t *handle, 2513 struct buffer_head *bh)); 2514 int do_journal_get_write_access(handle_t *handle, 2515 struct buffer_head *bh); 2516 #define FALL_BACK_TO_NONDELALLOC 1 2517 #define CONVERT_INLINE_DATA 2 2518 2519 extern struct inode *ext4_iget(struct super_block *, unsigned long); 2520 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long); 2521 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2522 extern int ext4_setattr(struct dentry *, struct iattr *); 2523 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 2524 struct kstat *stat); 2525 extern void ext4_evict_inode(struct inode *); 2526 extern void ext4_clear_inode(struct inode *); 2527 extern int ext4_sync_inode(handle_t *, struct inode *); 2528 extern void ext4_dirty_inode(struct inode *, int); 2529 extern int ext4_change_inode_journal_flag(struct inode *, int); 2530 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2531 extern int ext4_inode_attach_jinode(struct inode *inode); 2532 extern int ext4_can_truncate(struct inode *inode); 2533 extern void ext4_truncate(struct inode *); 2534 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2535 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 2536 extern void ext4_set_inode_flags(struct inode *); 2537 extern void ext4_get_inode_flags(struct ext4_inode_info *); 2538 extern int ext4_alloc_da_blocks(struct inode *inode); 2539 extern void ext4_set_aops(struct inode *inode); 2540 extern int ext4_writepage_trans_blocks(struct inode *); 2541 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2542 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2543 loff_t lstart, loff_t lend); 2544 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 2545 extern int ext4_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf); 2546 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2547 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 2548 extern void ext4_da_update_reserve_space(struct inode *inode, 2549 int used, int quota_claim); 2550 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 2551 ext4_fsblk_t pblk, ext4_lblk_t len); 2552 extern int ext4_get_next_extent(struct inode *inode, ext4_lblk_t lblk, 2553 unsigned int map_len, 2554 struct extent_status *result); 2555 2556 /* indirect.c */ 2557 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2558 struct ext4_map_blocks *map, int flags); 2559 extern ssize_t ext4_ind_direct_IO(struct kiocb *iocb, struct iov_iter *iter, 2560 loff_t offset); 2561 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2562 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2563 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2564 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2565 ext4_lblk_t start, ext4_lblk_t end); 2566 2567 /* ioctl.c */ 2568 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2569 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2570 2571 /* migrate.c */ 2572 extern int ext4_ext_migrate(struct inode *); 2573 extern int ext4_ind_migrate(struct inode *inode); 2574 2575 /* namei.c */ 2576 extern int ext4_dirent_csum_verify(struct inode *inode, 2577 struct ext4_dir_entry *dirent); 2578 extern int ext4_orphan_add(handle_t *, struct inode *); 2579 extern int ext4_orphan_del(handle_t *, struct inode *); 2580 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2581 __u32 start_minor_hash, __u32 *next_hash); 2582 extern int ext4_search_dir(struct buffer_head *bh, 2583 char *search_buf, 2584 int buf_size, 2585 struct inode *dir, 2586 struct ext4_filename *fname, 2587 const struct qstr *d_name, 2588 unsigned int offset, 2589 struct ext4_dir_entry_2 **res_dir); 2590 extern int ext4_generic_delete_entry(handle_t *handle, 2591 struct inode *dir, 2592 struct ext4_dir_entry_2 *de_del, 2593 struct buffer_head *bh, 2594 void *entry_buf, 2595 int buf_size, 2596 int csum_size); 2597 extern int ext4_empty_dir(struct inode *inode); 2598 2599 /* resize.c */ 2600 extern int ext4_group_add(struct super_block *sb, 2601 struct ext4_new_group_data *input); 2602 extern int ext4_group_extend(struct super_block *sb, 2603 struct ext4_super_block *es, 2604 ext4_fsblk_t n_blocks_count); 2605 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2606 2607 /* super.c */ 2608 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 2609 extern int ext4_calculate_overhead(struct super_block *sb); 2610 extern void ext4_superblock_csum_set(struct super_block *sb); 2611 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 2612 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 2613 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2614 ext4_group_t ngroup); 2615 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2616 char nbuf[16]); 2617 2618 extern __printf(4, 5) 2619 void __ext4_error(struct super_block *, const char *, unsigned int, 2620 const char *, ...); 2621 extern __printf(5, 6) 2622 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2623 const char *, ...); 2624 extern __printf(5, 6) 2625 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2626 const char *, ...); 2627 extern void __ext4_std_error(struct super_block *, const char *, 2628 unsigned int, int); 2629 extern __printf(4, 5) 2630 void __ext4_abort(struct super_block *, const char *, unsigned int, 2631 const char *, ...); 2632 extern __printf(4, 5) 2633 void __ext4_warning(struct super_block *, const char *, unsigned int, 2634 const char *, ...); 2635 extern __printf(4, 5) 2636 void __ext4_warning_inode(const struct inode *inode, const char *function, 2637 unsigned int line, const char *fmt, ...); 2638 extern __printf(3, 4) 2639 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2640 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2641 const char *, unsigned int, const char *); 2642 extern __printf(7, 8) 2643 void __ext4_grp_locked_error(const char *, unsigned int, 2644 struct super_block *, ext4_group_t, 2645 unsigned long, ext4_fsblk_t, 2646 const char *, ...); 2647 2648 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 2649 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 2650 2651 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 2652 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 2653 2654 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 2655 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 2656 2657 #ifdef CONFIG_PRINTK 2658 2659 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2660 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__) 2661 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2662 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2663 #define ext4_error(sb, fmt, ...) \ 2664 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2665 #define ext4_abort(sb, fmt, ...) \ 2666 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2667 #define ext4_warning(sb, fmt, ...) \ 2668 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2669 #define ext4_warning_inode(inode, fmt, ...) \ 2670 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 2671 #define ext4_msg(sb, level, fmt, ...) \ 2672 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 2673 #define dump_mmp_msg(sb, mmp, msg) \ 2674 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 2675 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2676 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 2677 fmt, ##__VA_ARGS__) 2678 2679 #else 2680 2681 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2682 do { \ 2683 no_printk(fmt, ##__VA_ARGS__); \ 2684 __ext4_error_inode(inode, "", 0, block, " "); \ 2685 } while (0) 2686 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2687 do { \ 2688 no_printk(fmt, ##__VA_ARGS__); \ 2689 __ext4_error_file(file, "", 0, block, " "); \ 2690 } while (0) 2691 #define ext4_error(sb, fmt, ...) \ 2692 do { \ 2693 no_printk(fmt, ##__VA_ARGS__); \ 2694 __ext4_error(sb, "", 0, " "); \ 2695 } while (0) 2696 #define ext4_abort(sb, fmt, ...) \ 2697 do { \ 2698 no_printk(fmt, ##__VA_ARGS__); \ 2699 __ext4_abort(sb, "", 0, " "); \ 2700 } while (0) 2701 #define ext4_warning(sb, fmt, ...) \ 2702 do { \ 2703 no_printk(fmt, ##__VA_ARGS__); \ 2704 __ext4_warning(sb, "", 0, " "); \ 2705 } while (0) 2706 #define ext4_warning_inode(inode, fmt, ...) \ 2707 do { \ 2708 no_printk(fmt, ##__VA_ARGS__); \ 2709 __ext4_warning_inode(inode, "", 0, " "); \ 2710 } while (0) 2711 #define ext4_msg(sb, level, fmt, ...) \ 2712 do { \ 2713 no_printk(fmt, ##__VA_ARGS__); \ 2714 __ext4_msg(sb, "", " "); \ 2715 } while (0) 2716 #define dump_mmp_msg(sb, mmp, msg) \ 2717 __dump_mmp_msg(sb, mmp, "", 0, "") 2718 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2719 do { \ 2720 no_printk(fmt, ##__VA_ARGS__); \ 2721 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 2722 } while (0) 2723 2724 #endif 2725 2726 extern void ext4_update_dynamic_rev(struct super_block *sb); 2727 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2728 __u32 compat); 2729 extern int ext4_update_rocompat_feature(handle_t *handle, 2730 struct super_block *sb, __u32 rocompat); 2731 extern int ext4_update_incompat_feature(handle_t *handle, 2732 struct super_block *sb, __u32 incompat); 2733 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2734 struct ext4_group_desc *bg); 2735 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2736 struct ext4_group_desc *bg); 2737 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2738 struct ext4_group_desc *bg); 2739 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2740 struct ext4_group_desc *bg); 2741 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2742 struct ext4_group_desc *bg); 2743 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2744 struct ext4_group_desc *bg); 2745 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2746 struct ext4_group_desc *bg); 2747 extern void ext4_block_bitmap_set(struct super_block *sb, 2748 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2749 extern void ext4_inode_bitmap_set(struct super_block *sb, 2750 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2751 extern void ext4_inode_table_set(struct super_block *sb, 2752 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2753 extern void ext4_free_group_clusters_set(struct super_block *sb, 2754 struct ext4_group_desc *bg, 2755 __u32 count); 2756 extern void ext4_free_inodes_set(struct super_block *sb, 2757 struct ext4_group_desc *bg, __u32 count); 2758 extern void ext4_used_dirs_set(struct super_block *sb, 2759 struct ext4_group_desc *bg, __u32 count); 2760 extern void ext4_itable_unused_set(struct super_block *sb, 2761 struct ext4_group_desc *bg, __u32 count); 2762 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2763 struct ext4_group_desc *gdp); 2764 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2765 struct ext4_group_desc *gdp); 2766 extern int ext4_register_li_request(struct super_block *sb, 2767 ext4_group_t first_not_zeroed); 2768 2769 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2770 { 2771 return ext4_has_feature_gdt_csum(sb) || 2772 EXT4_SB(sb)->s_chksum_driver != NULL; 2773 } 2774 2775 static inline int ext4_has_metadata_csum(struct super_block *sb) 2776 { 2777 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 2778 !EXT4_SB(sb)->s_chksum_driver); 2779 2780 return (EXT4_SB(sb)->s_chksum_driver != NULL); 2781 } 2782 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2783 { 2784 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2785 le32_to_cpu(es->s_blocks_count_lo); 2786 } 2787 2788 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2789 { 2790 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2791 le32_to_cpu(es->s_r_blocks_count_lo); 2792 } 2793 2794 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2795 { 2796 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2797 le32_to_cpu(es->s_free_blocks_count_lo); 2798 } 2799 2800 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2801 ext4_fsblk_t blk) 2802 { 2803 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2804 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2805 } 2806 2807 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2808 ext4_fsblk_t blk) 2809 { 2810 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2811 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2812 } 2813 2814 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2815 ext4_fsblk_t blk) 2816 { 2817 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2818 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2819 } 2820 2821 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 2822 { 2823 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2824 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2825 le32_to_cpu(raw_inode->i_size_lo); 2826 else 2827 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2828 } 2829 2830 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2831 { 2832 raw_inode->i_size_lo = cpu_to_le32(i_size); 2833 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2834 } 2835 2836 static inline 2837 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2838 ext4_group_t group) 2839 { 2840 struct ext4_group_info ***grp_info; 2841 long indexv, indexh; 2842 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 2843 grp_info = EXT4_SB(sb)->s_group_info; 2844 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2845 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2846 return grp_info[indexv][indexh]; 2847 } 2848 2849 /* 2850 * Reading s_groups_count requires using smp_rmb() afterwards. See 2851 * the locking protocol documented in the comments of ext4_group_add() 2852 * in resize.c 2853 */ 2854 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2855 { 2856 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2857 2858 smp_rmb(); 2859 return ngroups; 2860 } 2861 2862 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2863 ext4_group_t block_group) 2864 { 2865 return block_group >> sbi->s_log_groups_per_flex; 2866 } 2867 2868 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2869 { 2870 return 1 << sbi->s_log_groups_per_flex; 2871 } 2872 2873 #define ext4_std_error(sb, errno) \ 2874 do { \ 2875 if ((errno)) \ 2876 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2877 } while (0) 2878 2879 #ifdef CONFIG_SMP 2880 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2881 * counters. So we need to make sure we have free clusters more 2882 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2883 */ 2884 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2885 #else 2886 #define EXT4_FREECLUSTERS_WATERMARK 0 2887 #endif 2888 2889 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 2890 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2891 { 2892 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 2893 !inode_is_locked(inode)); 2894 down_write(&EXT4_I(inode)->i_data_sem); 2895 if (newsize > EXT4_I(inode)->i_disksize) 2896 EXT4_I(inode)->i_disksize = newsize; 2897 up_write(&EXT4_I(inode)->i_data_sem); 2898 } 2899 2900 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 2901 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 2902 { 2903 int changed = 0; 2904 2905 if (newsize > inode->i_size) { 2906 i_size_write(inode, newsize); 2907 changed = 1; 2908 } 2909 if (newsize > EXT4_I(inode)->i_disksize) { 2910 ext4_update_i_disksize(inode, newsize); 2911 changed |= 2; 2912 } 2913 return changed; 2914 } 2915 2916 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 2917 loff_t len); 2918 2919 struct ext4_group_info { 2920 unsigned long bb_state; 2921 struct rb_root bb_free_root; 2922 ext4_grpblk_t bb_first_free; /* first free block */ 2923 ext4_grpblk_t bb_free; /* total free blocks */ 2924 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 2925 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 2926 struct list_head bb_prealloc_list; 2927 #ifdef DOUBLE_CHECK 2928 void *bb_bitmap; 2929 #endif 2930 struct rw_semaphore alloc_sem; 2931 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2932 * regions, index is order. 2933 * bb_counters[3] = 5 means 2934 * 5 free 8-block regions. */ 2935 }; 2936 2937 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 2938 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 2939 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 2940 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 2941 2942 #define EXT4_MB_GRP_NEED_INIT(grp) \ 2943 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 2944 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 2945 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2946 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 2947 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2948 2949 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 2950 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2951 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 2952 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2953 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 2954 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2955 2956 #define EXT4_MAX_CONTENTION 8 2957 #define EXT4_CONTENTION_THRESHOLD 2 2958 2959 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2960 ext4_group_t group) 2961 { 2962 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2963 } 2964 2965 /* 2966 * Returns true if the filesystem is busy enough that attempts to 2967 * access the block group locks has run into contention. 2968 */ 2969 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 2970 { 2971 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 2972 } 2973 2974 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 2975 { 2976 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 2977 if (spin_trylock(lock)) 2978 /* 2979 * We're able to grab the lock right away, so drop the 2980 * lock contention counter. 2981 */ 2982 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 2983 else { 2984 /* 2985 * The lock is busy, so bump the contention counter, 2986 * and then wait on the spin lock. 2987 */ 2988 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 2989 EXT4_MAX_CONTENTION); 2990 spin_lock(lock); 2991 } 2992 } 2993 2994 static inline void ext4_unlock_group(struct super_block *sb, 2995 ext4_group_t group) 2996 { 2997 spin_unlock(ext4_group_lock_ptr(sb, group)); 2998 } 2999 3000 /* 3001 * Block validity checking 3002 */ 3003 #define ext4_check_indirect_blockref(inode, bh) \ 3004 ext4_check_blockref(__func__, __LINE__, inode, \ 3005 (__le32 *)(bh)->b_data, \ 3006 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 3007 3008 #define ext4_ind_check_inode(inode) \ 3009 ext4_check_blockref(__func__, __LINE__, inode, \ 3010 EXT4_I(inode)->i_data, \ 3011 EXT4_NDIR_BLOCKS) 3012 3013 /* 3014 * Inodes and files operations 3015 */ 3016 3017 /* dir.c */ 3018 extern const struct file_operations ext4_dir_operations; 3019 3020 /* file.c */ 3021 extern const struct inode_operations ext4_file_inode_operations; 3022 extern const struct file_operations ext4_file_operations; 3023 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 3024 3025 /* inline.c */ 3026 extern int ext4_get_max_inline_size(struct inode *inode); 3027 extern int ext4_find_inline_data_nolock(struct inode *inode); 3028 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 3029 unsigned int len); 3030 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 3031 3032 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 3033 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 3034 struct inode *inode, 3035 loff_t pos, unsigned len, 3036 unsigned flags, 3037 struct page **pagep); 3038 extern int ext4_write_inline_data_end(struct inode *inode, 3039 loff_t pos, unsigned len, 3040 unsigned copied, 3041 struct page *page); 3042 extern struct buffer_head * 3043 ext4_journalled_write_inline_data(struct inode *inode, 3044 unsigned len, 3045 struct page *page); 3046 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 3047 struct inode *inode, 3048 loff_t pos, unsigned len, 3049 unsigned flags, 3050 struct page **pagep, 3051 void **fsdata); 3052 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 3053 unsigned len, unsigned copied, 3054 struct page *page); 3055 extern int ext4_try_add_inline_entry(handle_t *handle, 3056 struct ext4_filename *fname, 3057 struct inode *dir, struct inode *inode); 3058 extern int ext4_try_create_inline_dir(handle_t *handle, 3059 struct inode *parent, 3060 struct inode *inode); 3061 extern int ext4_read_inline_dir(struct file *filp, 3062 struct dir_context *ctx, 3063 int *has_inline_data); 3064 extern int htree_inlinedir_to_tree(struct file *dir_file, 3065 struct inode *dir, ext4_lblk_t block, 3066 struct dx_hash_info *hinfo, 3067 __u32 start_hash, __u32 start_minor_hash, 3068 int *has_inline_data); 3069 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3070 struct ext4_filename *fname, 3071 const struct qstr *d_name, 3072 struct ext4_dir_entry_2 **res_dir, 3073 int *has_inline_data); 3074 extern int ext4_delete_inline_entry(handle_t *handle, 3075 struct inode *dir, 3076 struct ext4_dir_entry_2 *de_del, 3077 struct buffer_head *bh, 3078 int *has_inline_data); 3079 extern int empty_inline_dir(struct inode *dir, int *has_inline_data); 3080 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3081 struct ext4_dir_entry_2 **parent_de, 3082 int *retval); 3083 extern int ext4_inline_data_fiemap(struct inode *inode, 3084 struct fiemap_extent_info *fieinfo, 3085 int *has_inline, __u64 start, __u64 len); 3086 extern int ext4_try_to_evict_inline_data(handle_t *handle, 3087 struct inode *inode, 3088 int needed); 3089 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3090 3091 extern int ext4_convert_inline_data(struct inode *inode); 3092 3093 static inline int ext4_has_inline_data(struct inode *inode) 3094 { 3095 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3096 EXT4_I(inode)->i_inline_off; 3097 } 3098 3099 /* namei.c */ 3100 extern const struct inode_operations ext4_dir_inode_operations; 3101 extern const struct inode_operations ext4_special_inode_operations; 3102 extern struct dentry *ext4_get_parent(struct dentry *child); 3103 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3104 struct ext4_dir_entry_2 *de, 3105 int blocksize, int csum_size, 3106 unsigned int parent_ino, int dotdot_real_len); 3107 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t, 3108 unsigned int blocksize); 3109 extern int ext4_handle_dirty_dirent_node(handle_t *handle, 3110 struct inode *inode, 3111 struct buffer_head *bh); 3112 #define S_SHIFT 12 3113 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = { 3114 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3115 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3116 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3117 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3118 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3119 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3120 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3121 }; 3122 3123 static inline void ext4_set_de_type(struct super_block *sb, 3124 struct ext4_dir_entry_2 *de, 3125 umode_t mode) { 3126 if (ext4_has_feature_filetype(sb)) 3127 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3128 } 3129 3130 /* readpages.c */ 3131 extern int ext4_mpage_readpages(struct address_space *mapping, 3132 struct list_head *pages, struct page *page, 3133 unsigned nr_pages); 3134 3135 /* symlink.c */ 3136 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3137 extern const struct inode_operations ext4_symlink_inode_operations; 3138 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3139 3140 /* sysfs.c */ 3141 extern int ext4_register_sysfs(struct super_block *sb); 3142 extern void ext4_unregister_sysfs(struct super_block *sb); 3143 extern int __init ext4_init_sysfs(void); 3144 extern void ext4_exit_sysfs(void); 3145 3146 /* block_validity */ 3147 extern void ext4_release_system_zone(struct super_block *sb); 3148 extern int ext4_setup_system_zone(struct super_block *sb); 3149 extern int __init ext4_init_system_zone(void); 3150 extern void ext4_exit_system_zone(void); 3151 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 3152 ext4_fsblk_t start_blk, 3153 unsigned int count); 3154 extern int ext4_check_blockref(const char *, unsigned int, 3155 struct inode *, __le32 *, unsigned int); 3156 3157 /* extents.c */ 3158 struct ext4_ext_path; 3159 struct ext4_extent; 3160 3161 /* 3162 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3163 * __le32. 3164 */ 3165 #define EXT_MAX_BLOCKS 0xffffffff 3166 3167 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 3168 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 3169 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3170 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3171 struct ext4_map_blocks *map, int flags); 3172 extern void ext4_ext_truncate(handle_t *, struct inode *); 3173 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3174 ext4_lblk_t end); 3175 extern void ext4_ext_init(struct super_block *); 3176 extern void ext4_ext_release(struct super_block *); 3177 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3178 loff_t len); 3179 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3180 loff_t offset, ssize_t len); 3181 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3182 struct ext4_map_blocks *map, int flags); 3183 extern int ext4_ext_calc_metadata_amount(struct inode *inode, 3184 ext4_lblk_t lblocks); 3185 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3186 int num, 3187 struct ext4_ext_path *path); 3188 extern int ext4_can_extents_be_merged(struct inode *inode, 3189 struct ext4_extent *ex1, 3190 struct ext4_extent *ex2); 3191 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3192 struct ext4_ext_path **, 3193 struct ext4_extent *, int); 3194 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3195 struct ext4_ext_path **, 3196 int flags); 3197 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 3198 extern int ext4_ext_check_inode(struct inode *inode); 3199 extern int ext4_find_delalloc_range(struct inode *inode, 3200 ext4_lblk_t lblk_start, 3201 ext4_lblk_t lblk_end); 3202 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk); 3203 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3204 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3205 __u64 start, __u64 len); 3206 extern int ext4_ext_precache(struct inode *inode); 3207 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len); 3208 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len); 3209 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3210 struct inode *inode2, ext4_lblk_t lblk1, 3211 ext4_lblk_t lblk2, ext4_lblk_t count, 3212 int mark_unwritten,int *err); 3213 3214 /* move_extent.c */ 3215 extern void ext4_double_down_write_data_sem(struct inode *first, 3216 struct inode *second); 3217 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3218 struct inode *donor_inode); 3219 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3220 __u64 start_orig, __u64 start_donor, 3221 __u64 len, __u64 *moved_len); 3222 3223 /* page-io.c */ 3224 extern int __init ext4_init_pageio(void); 3225 extern void ext4_exit_pageio(void); 3226 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3227 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3228 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3229 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3230 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3231 struct writeback_control *wbc); 3232 extern void ext4_end_io_rsv_work(struct work_struct *work); 3233 extern void ext4_io_submit(struct ext4_io_submit *io); 3234 extern int ext4_bio_write_page(struct ext4_io_submit *io, 3235 struct page *page, 3236 int len, 3237 struct writeback_control *wbc, 3238 bool keep_towrite); 3239 3240 /* mmp.c */ 3241 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3242 3243 /* 3244 * Add new method to test whether block and inode bitmaps are properly 3245 * initialized. With uninit_bg reading the block from disk is not enough 3246 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3247 */ 3248 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3249 3250 static inline int bitmap_uptodate(struct buffer_head *bh) 3251 { 3252 return (buffer_uptodate(bh) && 3253 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3254 } 3255 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3256 { 3257 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3258 } 3259 3260 /* 3261 * Disable DIO read nolock optimization, so new dioreaders will be forced 3262 * to grab i_mutex 3263 */ 3264 static inline void ext4_inode_block_unlocked_dio(struct inode *inode) 3265 { 3266 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 3267 smp_mb(); 3268 } 3269 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode) 3270 { 3271 smp_mb(); 3272 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 3273 } 3274 3275 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3276 3277 /* For ioend & aio unwritten conversion wait queues */ 3278 #define EXT4_WQ_HASH_SZ 37 3279 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3280 EXT4_WQ_HASH_SZ]) 3281 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3282 3283 #define EXT4_RESIZING 0 3284 extern int ext4_resize_begin(struct super_block *sb); 3285 extern void ext4_resize_end(struct super_block *sb); 3286 3287 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 3288 struct ext4_io_end *io_end) 3289 { 3290 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 3291 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3292 atomic_inc(&EXT4_I(inode)->i_unwritten); 3293 } 3294 } 3295 3296 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3297 { 3298 struct inode *inode = io_end->inode; 3299 3300 if (io_end->flag & EXT4_IO_END_UNWRITTEN) { 3301 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3302 /* Wake up anyone waiting on unwritten extent conversion */ 3303 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) 3304 wake_up_all(ext4_ioend_wq(inode)); 3305 } 3306 } 3307 3308 #endif /* __KERNEL__ */ 3309 3310 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3311 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3312 3313 #endif /* _EXT4_H */ 3314