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 #include <linux/percpu-rwsem.h> 37 #ifdef __KERNEL__ 38 #include <linux/compat.h> 39 #endif 40 41 /* 42 * The fourth extended filesystem constants/structures 43 */ 44 45 /* 46 * with AGGRESSIVE_CHECK allocator runs consistency checks over 47 * structures. these checks slow things down a lot 48 */ 49 #define AGGRESSIVE_CHECK__ 50 51 /* 52 * with DOUBLE_CHECK defined mballoc creates persistent in-core 53 * bitmaps, maintains and uses them to check for double allocations 54 */ 55 #define DOUBLE_CHECK__ 56 57 /* 58 * Define EXT4FS_DEBUG to produce debug messages 59 */ 60 #undef EXT4FS_DEBUG 61 62 /* 63 * Debug code 64 */ 65 #ifdef EXT4FS_DEBUG 66 #define ext4_debug(f, a...) \ 67 do { \ 68 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 69 __FILE__, __LINE__, __func__); \ 70 printk(KERN_DEBUG f, ## a); \ 71 } while (0) 72 #else 73 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 74 #endif 75 76 /* 77 * Turn on EXT_DEBUG to get lots of info about extents operations. 78 */ 79 #define EXT_DEBUG__ 80 #ifdef EXT_DEBUG 81 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__) 82 #else 83 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__) 84 #endif 85 86 /* data type for block offset of block group */ 87 typedef int ext4_grpblk_t; 88 89 /* data type for filesystem-wide blocks number */ 90 typedef unsigned long long ext4_fsblk_t; 91 92 /* data type for file logical block number */ 93 typedef __u32 ext4_lblk_t; 94 95 /* data type for block group number */ 96 typedef unsigned int ext4_group_t; 97 98 enum SHIFT_DIRECTION { 99 SHIFT_LEFT = 0, 100 SHIFT_RIGHT, 101 }; 102 103 /* 104 * Flags used in mballoc's allocation_context flags field. 105 * 106 * Also used to show what's going on for debugging purposes when the 107 * flag field is exported via the traceport interface 108 */ 109 110 /* prefer goal again. length */ 111 #define EXT4_MB_HINT_MERGE 0x0001 112 /* blocks already reserved */ 113 #define EXT4_MB_HINT_RESERVED 0x0002 114 /* metadata is being allocated */ 115 #define EXT4_MB_HINT_METADATA 0x0004 116 /* first blocks in the file */ 117 #define EXT4_MB_HINT_FIRST 0x0008 118 /* search for the best chunk */ 119 #define EXT4_MB_HINT_BEST 0x0010 120 /* data is being allocated */ 121 #define EXT4_MB_HINT_DATA 0x0020 122 /* don't preallocate (for tails) */ 123 #define EXT4_MB_HINT_NOPREALLOC 0x0040 124 /* allocate for locality group */ 125 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 126 /* allocate goal blocks or none */ 127 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 128 /* goal is meaningful */ 129 #define EXT4_MB_HINT_TRY_GOAL 0x0200 130 /* blocks already pre-reserved by delayed allocation */ 131 #define EXT4_MB_DELALLOC_RESERVED 0x0400 132 /* We are doing stream allocation */ 133 #define EXT4_MB_STREAM_ALLOC 0x0800 134 /* Use reserved root blocks if needed */ 135 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000 136 /* Use blocks from reserved pool */ 137 #define EXT4_MB_USE_RESERVED 0x2000 138 139 struct ext4_allocation_request { 140 /* target inode for block we're allocating */ 141 struct inode *inode; 142 /* how many blocks we want to allocate */ 143 unsigned int len; 144 /* logical block in target inode */ 145 ext4_lblk_t logical; 146 /* the closest logical allocated block to the left */ 147 ext4_lblk_t lleft; 148 /* the closest logical allocated block to the right */ 149 ext4_lblk_t lright; 150 /* phys. target (a hint) */ 151 ext4_fsblk_t goal; 152 /* phys. block for the closest logical allocated block to the left */ 153 ext4_fsblk_t pleft; 154 /* phys. block for the closest logical allocated block to the right */ 155 ext4_fsblk_t pright; 156 /* flags. see above EXT4_MB_HINT_* */ 157 unsigned int flags; 158 }; 159 160 /* 161 * Logical to physical block mapping, used by ext4_map_blocks() 162 * 163 * This structure is used to pass requests into ext4_map_blocks() as 164 * well as to store the information returned by ext4_map_blocks(). It 165 * takes less room on the stack than a struct buffer_head. 166 */ 167 #define EXT4_MAP_NEW (1 << BH_New) 168 #define EXT4_MAP_MAPPED (1 << BH_Mapped) 169 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 170 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 171 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 172 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY) 173 174 struct ext4_map_blocks { 175 ext4_fsblk_t m_pblk; 176 ext4_lblk_t m_lblk; 177 unsigned int m_len; 178 unsigned int m_flags; 179 }; 180 181 /* 182 * Flags for ext4_io_end->flags 183 */ 184 #define EXT4_IO_END_UNWRITTEN 0x0001 185 186 /* 187 * For converting unwritten extents on a work queue. 'handle' is used for 188 * buffered writeback. 189 */ 190 typedef struct ext4_io_end { 191 struct list_head list; /* per-file finished IO list */ 192 handle_t *handle; /* handle reserved for extent 193 * conversion */ 194 struct inode *inode; /* file being written to */ 195 struct bio *bio; /* Linked list of completed 196 * bios covering the extent */ 197 unsigned int flag; /* unwritten or not */ 198 atomic_t count; /* reference counter */ 199 loff_t offset; /* offset in the file */ 200 ssize_t size; /* size of the extent */ 201 } ext4_io_end_t; 202 203 struct ext4_io_submit { 204 struct writeback_control *io_wbc; 205 struct bio *io_bio; 206 ext4_io_end_t *io_end; 207 sector_t io_next_block; 208 }; 209 210 /* 211 * Special inodes numbers 212 */ 213 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 214 #define EXT4_ROOT_INO 2 /* Root inode */ 215 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 216 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 217 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 218 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 219 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 220 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 221 222 /* First non-reserved inode for old ext4 filesystems */ 223 #define EXT4_GOOD_OLD_FIRST_INO 11 224 225 /* 226 * Maximal count of links to a file 227 */ 228 #define EXT4_LINK_MAX 65000 229 230 /* 231 * Macro-instructions used to manage several block sizes 232 */ 233 #define EXT4_MIN_BLOCK_SIZE 1024 234 #define EXT4_MAX_BLOCK_SIZE 65536 235 #define EXT4_MIN_BLOCK_LOG_SIZE 10 236 #define EXT4_MAX_BLOCK_LOG_SIZE 16 237 #ifdef __KERNEL__ 238 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 239 #else 240 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 241 #endif 242 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 243 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \ 244 EXT4_SB(s)->s_cluster_bits) 245 #ifdef __KERNEL__ 246 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 247 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits) 248 #else 249 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 250 #endif 251 #ifdef __KERNEL__ 252 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 253 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 254 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 255 #else 256 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 257 EXT4_GOOD_OLD_INODE_SIZE : \ 258 (s)->s_inode_size) 259 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 260 EXT4_GOOD_OLD_FIRST_INO : \ 261 (s)->s_first_ino) 262 #endif 263 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 264 265 /* Translate a block number to a cluster number */ 266 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits) 267 /* Translate a cluster number to a block number */ 268 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits) 269 /* Translate # of blks to # of clusters */ 270 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \ 271 (sbi)->s_cluster_bits) 272 /* Mask out the low bits to get the starting block of the cluster */ 273 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \ 274 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 275 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \ 276 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 277 /* Get the cluster offset */ 278 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \ 279 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1)) 280 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \ 281 ((ext4_lblk_t) (s)->s_cluster_ratio - 1)) 282 283 /* 284 * Structure of a blocks group descriptor 285 */ 286 struct ext4_group_desc 287 { 288 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 289 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 290 __le32 bg_inode_table_lo; /* Inodes table block */ 291 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 292 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 293 __le16 bg_used_dirs_count_lo; /* Directories count */ 294 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 295 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 296 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */ 297 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */ 298 __le16 bg_itable_unused_lo; /* Unused inodes count */ 299 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 300 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 301 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 302 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 303 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 304 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 305 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 306 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 307 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 308 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */ 309 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */ 310 __u32 bg_reserved; 311 }; 312 313 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \ 314 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \ 315 sizeof(__le16)) 316 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \ 317 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \ 318 sizeof(__le16)) 319 320 /* 321 * Structure of a flex block group info 322 */ 323 324 struct flex_groups { 325 atomic64_t free_clusters; 326 atomic_t free_inodes; 327 atomic_t used_dirs; 328 }; 329 330 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 331 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 332 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 333 334 /* 335 * Macro-instructions used to manage group descriptors 336 */ 337 #define EXT4_MIN_DESC_SIZE 32 338 #define EXT4_MIN_DESC_SIZE_64BIT 64 339 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 340 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 341 #ifdef __KERNEL__ 342 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 343 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group) 344 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 345 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 346 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 347 #else 348 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 349 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 350 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 351 #endif 352 353 /* 354 * Constants relative to the data blocks 355 */ 356 #define EXT4_NDIR_BLOCKS 12 357 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 358 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 359 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 360 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 361 362 /* 363 * Inode flags 364 */ 365 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 366 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 367 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 368 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 369 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 370 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 371 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 372 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 373 /* Reserved for compression usage... */ 374 #define EXT4_DIRTY_FL 0x00000100 375 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 376 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 377 /* nb: was previously EXT2_ECOMPR_FL */ 378 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */ 379 /* End compression flags --- maybe not all used */ 380 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 381 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 382 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 383 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 384 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 385 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 386 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 387 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 388 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 389 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 390 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */ 391 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 392 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 393 394 #define EXT4_FL_USER_VISIBLE 0x304BDFFF /* User visible flags */ 395 #define EXT4_FL_USER_MODIFIABLE 0x204380FF /* User modifiable flags */ 396 397 #define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \ 398 EXT4_IMMUTABLE_FL | \ 399 EXT4_APPEND_FL | \ 400 EXT4_NODUMP_FL | \ 401 EXT4_NOATIME_FL | \ 402 EXT4_PROJINHERIT_FL) 403 404 /* Flags that should be inherited by new inodes from their parent. */ 405 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 406 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 407 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 408 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\ 409 EXT4_PROJINHERIT_FL) 410 411 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 412 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 413 414 /* Flags that are appropriate for non-directories/regular files. */ 415 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 416 417 /* Mask out flags that are inappropriate for the given type of inode. */ 418 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 419 { 420 if (S_ISDIR(mode)) 421 return flags; 422 else if (S_ISREG(mode)) 423 return flags & EXT4_REG_FLMASK; 424 else 425 return flags & EXT4_OTHER_FLMASK; 426 } 427 428 /* 429 * Inode flags used for atomic set/get 430 */ 431 enum { 432 EXT4_INODE_SECRM = 0, /* Secure deletion */ 433 EXT4_INODE_UNRM = 1, /* Undelete */ 434 EXT4_INODE_COMPR = 2, /* Compress file */ 435 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 436 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 437 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 438 EXT4_INODE_NODUMP = 6, /* do not dump file */ 439 EXT4_INODE_NOATIME = 7, /* do not update atime */ 440 /* Reserved for compression usage... */ 441 EXT4_INODE_DIRTY = 8, 442 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 443 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 444 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */ 445 /* End compression flags --- maybe not all used */ 446 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 447 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 448 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 449 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 450 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 451 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 452 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 453 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 454 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 455 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 456 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */ 457 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */ 458 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 459 }; 460 461 /* 462 * Since it's pretty easy to mix up bit numbers and hex values, we use a 463 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to 464 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost 465 * any extra space in the compiled kernel image, otherwise, the build will fail. 466 * It's important that these values are the same, since we are using 467 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent 468 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk 469 * values found in ext2, ext3 and ext4 filesystems, and of course the values 470 * defined in e2fsprogs. 471 * 472 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 473 */ 474 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 475 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG)) 476 477 static inline void ext4_check_flag_values(void) 478 { 479 CHECK_FLAG_VALUE(SECRM); 480 CHECK_FLAG_VALUE(UNRM); 481 CHECK_FLAG_VALUE(COMPR); 482 CHECK_FLAG_VALUE(SYNC); 483 CHECK_FLAG_VALUE(IMMUTABLE); 484 CHECK_FLAG_VALUE(APPEND); 485 CHECK_FLAG_VALUE(NODUMP); 486 CHECK_FLAG_VALUE(NOATIME); 487 CHECK_FLAG_VALUE(DIRTY); 488 CHECK_FLAG_VALUE(COMPRBLK); 489 CHECK_FLAG_VALUE(NOCOMPR); 490 CHECK_FLAG_VALUE(ENCRYPT); 491 CHECK_FLAG_VALUE(INDEX); 492 CHECK_FLAG_VALUE(IMAGIC); 493 CHECK_FLAG_VALUE(JOURNAL_DATA); 494 CHECK_FLAG_VALUE(NOTAIL); 495 CHECK_FLAG_VALUE(DIRSYNC); 496 CHECK_FLAG_VALUE(TOPDIR); 497 CHECK_FLAG_VALUE(HUGE_FILE); 498 CHECK_FLAG_VALUE(EXTENTS); 499 CHECK_FLAG_VALUE(EA_INODE); 500 CHECK_FLAG_VALUE(EOFBLOCKS); 501 CHECK_FLAG_VALUE(INLINE_DATA); 502 CHECK_FLAG_VALUE(PROJINHERIT); 503 CHECK_FLAG_VALUE(RESERVED); 504 } 505 506 /* Used to pass group descriptor data when online resize is done */ 507 struct ext4_new_group_input { 508 __u32 group; /* Group number for this data */ 509 __u64 block_bitmap; /* Absolute block number of block bitmap */ 510 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 511 __u64 inode_table; /* Absolute block number of inode table start */ 512 __u32 blocks_count; /* Total number of blocks in this group */ 513 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 514 __u16 unused; 515 }; 516 517 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 518 struct compat_ext4_new_group_input { 519 u32 group; 520 compat_u64 block_bitmap; 521 compat_u64 inode_bitmap; 522 compat_u64 inode_table; 523 u32 blocks_count; 524 u16 reserved_blocks; 525 u16 unused; 526 }; 527 #endif 528 529 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 530 struct ext4_new_group_data { 531 __u32 group; 532 __u64 block_bitmap; 533 __u64 inode_bitmap; 534 __u64 inode_table; 535 __u32 blocks_count; 536 __u16 reserved_blocks; 537 __u16 unused; 538 __u32 free_blocks_count; 539 }; 540 541 /* Indexes used to index group tables in ext4_new_group_data */ 542 enum { 543 BLOCK_BITMAP = 0, /* block bitmap */ 544 INODE_BITMAP, /* inode bitmap */ 545 INODE_TABLE, /* inode tables */ 546 GROUP_TABLE_COUNT, 547 }; 548 549 /* 550 * Flags used by ext4_map_blocks() 551 */ 552 /* Allocate any needed blocks and/or convert an unwritten 553 extent to be an initialized ext4 */ 554 #define EXT4_GET_BLOCKS_CREATE 0x0001 555 /* Request the creation of an unwritten extent */ 556 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002 557 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\ 558 EXT4_GET_BLOCKS_CREATE) 559 /* Caller is from the delayed allocation writeout path 560 * finally doing the actual allocation of delayed blocks */ 561 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 562 /* caller is from the direct IO path, request to creation of an 563 unwritten extents if not allocated, split the unwritten 564 extent if blocks has been preallocated already*/ 565 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 566 #define EXT4_GET_BLOCKS_CONVERT 0x0010 567 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 568 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 569 /* Convert extent to initialized after IO complete */ 570 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 571 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT) 572 /* Eventual metadata allocation (due to growing extent tree) 573 * should not fail, so try to use reserved blocks for that.*/ 574 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020 575 /* Don't normalize allocation size (used for fallocate) */ 576 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040 577 /* Request will not result in inode size update (user for fallocate) */ 578 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 579 /* Convert written extents to unwritten */ 580 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 581 /* Write zeros to newly created written extents */ 582 #define EXT4_GET_BLOCKS_ZERO 0x0200 583 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ 584 EXT4_GET_BLOCKS_ZERO) 585 /* Caller will submit data before dropping transaction handle. This 586 * allows jbd2 to avoid submitting data before commit. */ 587 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400 588 589 /* 590 * The bit position of these flags must not overlap with any of the 591 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(), 592 * read_extent_tree_block(), ext4_split_extent_at(), 593 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf(). 594 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be 595 * caching the extents when reading from the extent tree while a 596 * truncate or punch hole operation is in progress. 597 */ 598 #define EXT4_EX_NOCACHE 0x40000000 599 #define EXT4_EX_FORCE_CACHE 0x20000000 600 601 /* 602 * Flags used by ext4_free_blocks 603 */ 604 #define EXT4_FREE_BLOCKS_METADATA 0x0001 605 #define EXT4_FREE_BLOCKS_FORGET 0x0002 606 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 607 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008 608 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010 609 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020 610 611 /* Encryption algorithms */ 612 #define EXT4_ENCRYPTION_MODE_INVALID 0 613 #define EXT4_ENCRYPTION_MODE_AES_256_XTS 1 614 #define EXT4_ENCRYPTION_MODE_AES_256_GCM 2 615 #define EXT4_ENCRYPTION_MODE_AES_256_CBC 3 616 #define EXT4_ENCRYPTION_MODE_AES_256_CTS 4 617 618 #include "ext4_crypto.h" 619 620 /* 621 * ioctl commands 622 */ 623 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 624 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 625 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 626 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 627 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 628 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 629 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 630 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 631 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 632 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 633 #define EXT4_IOC_MIGRATE _IO('f', 9) 634 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 635 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 636 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 637 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 638 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 639 #define EXT4_IOC_SWAP_BOOT _IO('f', 17) 640 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18) 641 #define EXT4_IOC_SET_ENCRYPTION_POLICY _IOR('f', 19, struct ext4_encryption_policy) 642 #define EXT4_IOC_GET_ENCRYPTION_PWSALT _IOW('f', 20, __u8[16]) 643 #define EXT4_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct ext4_encryption_policy) 644 645 #ifndef FS_IOC_FSGETXATTR 646 /* Until the uapi changes get merged for project quota... */ 647 648 #define FS_IOC_FSGETXATTR _IOR('X', 31, struct fsxattr) 649 #define FS_IOC_FSSETXATTR _IOW('X', 32, struct fsxattr) 650 651 /* 652 * Structure for FS_IOC_FSGETXATTR and FS_IOC_FSSETXATTR. 653 */ 654 struct fsxattr { 655 __u32 fsx_xflags; /* xflags field value (get/set) */ 656 __u32 fsx_extsize; /* extsize field value (get/set)*/ 657 __u32 fsx_nextents; /* nextents field value (get) */ 658 __u32 fsx_projid; /* project identifier (get/set) */ 659 unsigned char fsx_pad[12]; 660 }; 661 662 /* 663 * Flags for the fsx_xflags field 664 */ 665 #define FS_XFLAG_REALTIME 0x00000001 /* data in realtime volume */ 666 #define FS_XFLAG_PREALLOC 0x00000002 /* preallocated file extents */ 667 #define FS_XFLAG_IMMUTABLE 0x00000008 /* file cannot be modified */ 668 #define FS_XFLAG_APPEND 0x00000010 /* all writes append */ 669 #define FS_XFLAG_SYNC 0x00000020 /* all writes synchronous */ 670 #define FS_XFLAG_NOATIME 0x00000040 /* do not update access time */ 671 #define FS_XFLAG_NODUMP 0x00000080 /* do not include in backups */ 672 #define FS_XFLAG_RTINHERIT 0x00000100 /* create with rt bit set */ 673 #define FS_XFLAG_PROJINHERIT 0x00000200 /* create with parents projid */ 674 #define FS_XFLAG_NOSYMLINKS 0x00000400 /* disallow symlink creation */ 675 #define FS_XFLAG_EXTSIZE 0x00000800 /* extent size allocator hint */ 676 #define FS_XFLAG_EXTSZINHERIT 0x00001000 /* inherit inode extent size */ 677 #define FS_XFLAG_NODEFRAG 0x00002000 /* do not defragment */ 678 #define FS_XFLAG_FILESTREAM 0x00004000 /* use filestream allocator */ 679 #define FS_XFLAG_HASATTR 0x80000000 /* no DIFLAG for this */ 680 #endif /* !defined(FS_IOC_FSGETXATTR) */ 681 682 #define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR 683 #define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR 684 685 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) 686 /* 687 * ioctl commands in 32 bit emulation 688 */ 689 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 690 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 691 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 692 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 693 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 694 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 695 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 696 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 697 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 698 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 699 #endif 700 701 /* Max physical block we can address w/o extents */ 702 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 703 704 /* 705 * Structure of an inode on the disk 706 */ 707 struct ext4_inode { 708 __le16 i_mode; /* File mode */ 709 __le16 i_uid; /* Low 16 bits of Owner Uid */ 710 __le32 i_size_lo; /* Size in bytes */ 711 __le32 i_atime; /* Access time */ 712 __le32 i_ctime; /* Inode Change time */ 713 __le32 i_mtime; /* Modification time */ 714 __le32 i_dtime; /* Deletion Time */ 715 __le16 i_gid; /* Low 16 bits of Group Id */ 716 __le16 i_links_count; /* Links count */ 717 __le32 i_blocks_lo; /* Blocks count */ 718 __le32 i_flags; /* File flags */ 719 union { 720 struct { 721 __le32 l_i_version; 722 } linux1; 723 struct { 724 __u32 h_i_translator; 725 } hurd1; 726 struct { 727 __u32 m_i_reserved1; 728 } masix1; 729 } osd1; /* OS dependent 1 */ 730 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 731 __le32 i_generation; /* File version (for NFS) */ 732 __le32 i_file_acl_lo; /* File ACL */ 733 __le32 i_size_high; 734 __le32 i_obso_faddr; /* Obsoleted fragment address */ 735 union { 736 struct { 737 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 738 __le16 l_i_file_acl_high; 739 __le16 l_i_uid_high; /* these 2 fields */ 740 __le16 l_i_gid_high; /* were reserved2[0] */ 741 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */ 742 __le16 l_i_reserved; 743 } linux2; 744 struct { 745 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 746 __u16 h_i_mode_high; 747 __u16 h_i_uid_high; 748 __u16 h_i_gid_high; 749 __u32 h_i_author; 750 } hurd2; 751 struct { 752 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 753 __le16 m_i_file_acl_high; 754 __u32 m_i_reserved2[2]; 755 } masix2; 756 } osd2; /* OS dependent 2 */ 757 __le16 i_extra_isize; 758 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */ 759 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 760 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 761 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 762 __le32 i_crtime; /* File Creation time */ 763 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 764 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 765 __le32 i_projid; /* Project ID */ 766 }; 767 768 struct move_extent { 769 __u32 reserved; /* should be zero */ 770 __u32 donor_fd; /* donor file descriptor */ 771 __u64 orig_start; /* logical start offset in block for orig */ 772 __u64 donor_start; /* logical start offset in block for donor */ 773 __u64 len; /* block length to be moved */ 774 __u64 moved_len; /* moved block length */ 775 }; 776 777 #define EXT4_EPOCH_BITS 2 778 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 779 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 780 781 /* 782 * Extended fields will fit into an inode if the filesystem was formatted 783 * with large inodes (-I 256 or larger) and there are not currently any EAs 784 * consuming all of the available space. For new inodes we always reserve 785 * enough space for the kernel's known extended fields, but for inodes 786 * created with an old kernel this might not have been the case. None of 787 * the extended inode fields is critical for correct filesystem operation. 788 * This macro checks if a certain field fits in the inode. Note that 789 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 790 */ 791 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 792 ((offsetof(typeof(*ext4_inode), field) + \ 793 sizeof((ext4_inode)->field)) \ 794 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 795 (einode)->i_extra_isize)) \ 796 797 /* 798 * We use an encoding that preserves the times for extra epoch "00": 799 * 800 * extra msb of adjust for signed 801 * epoch 32-bit 32-bit tv_sec to 802 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range 803 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31 804 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19 805 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07 806 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25 807 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16 808 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04 809 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22 810 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10 811 * 812 * Note that previous versions of the kernel on 64-bit systems would 813 * incorrectly use extra epoch bits 1,1 for dates between 1901 and 814 * 1970. e2fsck will correct this, assuming that it is run on the 815 * affected filesystem before 2242. 816 */ 817 818 static inline __le32 ext4_encode_extra_time(struct timespec *time) 819 { 820 u32 extra = sizeof(time->tv_sec) > 4 ? 821 ((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK : 0; 822 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS)); 823 } 824 825 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 826 { 827 if (unlikely(sizeof(time->tv_sec) > 4 && 828 (extra & cpu_to_le32(EXT4_EPOCH_MASK)))) { 829 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,20,0) 830 /* Handle legacy encoding of pre-1970 dates with epoch 831 * bits 1,1. We assume that by kernel version 4.20, 832 * everyone will have run fsck over the affected 833 * filesystems to correct the problem. (This 834 * backwards compatibility may be removed before this 835 * time, at the discretion of the ext4 developers.) 836 */ 837 u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK; 838 if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0) 839 extra_bits = 0; 840 time->tv_sec += extra_bits << 32; 841 #else 842 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32; 843 #endif 844 } 845 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 846 } 847 848 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 849 do { \ 850 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 851 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 852 (raw_inode)->xtime ## _extra = \ 853 ext4_encode_extra_time(&(inode)->xtime); \ 854 } while (0) 855 856 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 857 do { \ 858 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 859 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 860 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 861 (raw_inode)->xtime ## _extra = \ 862 ext4_encode_extra_time(&(einode)->xtime); \ 863 } while (0) 864 865 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 866 do { \ 867 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 868 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 869 ext4_decode_extra_time(&(inode)->xtime, \ 870 raw_inode->xtime ## _extra); \ 871 else \ 872 (inode)->xtime.tv_nsec = 0; \ 873 } while (0) 874 875 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 876 do { \ 877 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 878 (einode)->xtime.tv_sec = \ 879 (signed)le32_to_cpu((raw_inode)->xtime); \ 880 else \ 881 (einode)->xtime.tv_sec = 0; \ 882 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 883 ext4_decode_extra_time(&(einode)->xtime, \ 884 raw_inode->xtime ## _extra); \ 885 else \ 886 (einode)->xtime.tv_nsec = 0; \ 887 } while (0) 888 889 #define i_disk_version osd1.linux1.l_i_version 890 891 #if defined(__KERNEL__) || defined(__linux__) 892 #define i_reserved1 osd1.linux1.l_i_reserved1 893 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 894 #define i_blocks_high osd2.linux2.l_i_blocks_high 895 #define i_uid_low i_uid 896 #define i_gid_low i_gid 897 #define i_uid_high osd2.linux2.l_i_uid_high 898 #define i_gid_high osd2.linux2.l_i_gid_high 899 #define i_checksum_lo osd2.linux2.l_i_checksum_lo 900 901 #elif defined(__GNU__) 902 903 #define i_translator osd1.hurd1.h_i_translator 904 #define i_uid_high osd2.hurd2.h_i_uid_high 905 #define i_gid_high osd2.hurd2.h_i_gid_high 906 #define i_author osd2.hurd2.h_i_author 907 908 #elif defined(__masix__) 909 910 #define i_reserved1 osd1.masix1.m_i_reserved1 911 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 912 #define i_reserved2 osd2.masix2.m_i_reserved2 913 914 #endif /* defined(__KERNEL__) || defined(__linux__) */ 915 916 #include "extents_status.h" 917 918 /* 919 * Lock subclasses for i_data_sem in the ext4_inode_info structure. 920 * 921 * These are needed to avoid lockdep false positives when we need to 922 * allocate blocks to the quota inode during ext4_map_blocks(), while 923 * holding i_data_sem for a normal (non-quota) inode. Since we don't 924 * do quota tracking for the quota inode, this avoids deadlock (as 925 * well as infinite recursion, since it isn't turtles all the way 926 * down...) 927 * 928 * I_DATA_SEM_NORMAL - Used for most inodes 929 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode 930 * where the second inode has larger inode number 931 * than the first 932 * I_DATA_SEM_QUOTA - Used for quota inodes only 933 */ 934 enum { 935 I_DATA_SEM_NORMAL = 0, 936 I_DATA_SEM_OTHER, 937 I_DATA_SEM_QUOTA, 938 }; 939 940 941 /* 942 * fourth extended file system inode data in memory 943 */ 944 struct ext4_inode_info { 945 __le32 i_data[15]; /* unconverted */ 946 __u32 i_dtime; 947 ext4_fsblk_t i_file_acl; 948 949 /* 950 * i_block_group is the number of the block group which contains 951 * this file's inode. Constant across the lifetime of the inode, 952 * it is ued for making block allocation decisions - we try to 953 * place a file's data blocks near its inode block, and new inodes 954 * near to their parent directory's inode. 955 */ 956 ext4_group_t i_block_group; 957 ext4_lblk_t i_dir_start_lookup; 958 #if (BITS_PER_LONG < 64) 959 unsigned long i_state_flags; /* Dynamic state flags */ 960 #endif 961 unsigned long i_flags; 962 963 /* 964 * Extended attributes can be read independently of the main file 965 * data. Taking i_mutex even when reading would cause contention 966 * between readers of EAs and writers of regular file data, so 967 * instead we synchronize on xattr_sem when reading or changing 968 * EAs. 969 */ 970 struct rw_semaphore xattr_sem; 971 972 struct list_head i_orphan; /* unlinked but open inodes */ 973 974 /* 975 * i_disksize keeps track of what the inode size is ON DISK, not 976 * in memory. During truncate, i_size is set to the new size by 977 * the VFS prior to calling ext4_truncate(), but the filesystem won't 978 * set i_disksize to 0 until the truncate is actually under way. 979 * 980 * The intent is that i_disksize always represents the blocks which 981 * are used by this file. This allows recovery to restart truncate 982 * on orphans if we crash during truncate. We actually write i_disksize 983 * into the on-disk inode when writing inodes out, instead of i_size. 984 * 985 * The only time when i_disksize and i_size may be different is when 986 * a truncate is in progress. The only things which change i_disksize 987 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 988 */ 989 loff_t i_disksize; 990 991 /* 992 * i_data_sem is for serialising ext4_truncate() against 993 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 994 * data tree are chopped off during truncate. We can't do that in 995 * ext4 because whenever we perform intermediate commits during 996 * truncate, the inode and all the metadata blocks *must* be in a 997 * consistent state which allows truncation of the orphans to restart 998 * during recovery. Hence we must fix the get_block-vs-truncate race 999 * by other means, so we have i_data_sem. 1000 */ 1001 struct rw_semaphore i_data_sem; 1002 /* 1003 * i_mmap_sem is for serializing page faults with truncate / punch hole 1004 * operations. We have to make sure that new page cannot be faulted in 1005 * a section of the inode that is being punched. We cannot easily use 1006 * i_data_sem for this since we need protection for the whole punch 1007 * operation and i_data_sem ranks below transaction start so we have 1008 * to occasionally drop it. 1009 */ 1010 struct rw_semaphore i_mmap_sem; 1011 struct inode vfs_inode; 1012 struct jbd2_inode *jinode; 1013 1014 spinlock_t i_raw_lock; /* protects updates to the raw inode */ 1015 1016 /* 1017 * File creation time. Its function is same as that of 1018 * struct timespec i_{a,c,m}time in the generic inode. 1019 */ 1020 struct timespec i_crtime; 1021 1022 /* mballoc */ 1023 struct list_head i_prealloc_list; 1024 spinlock_t i_prealloc_lock; 1025 1026 /* extents status tree */ 1027 struct ext4_es_tree i_es_tree; 1028 rwlock_t i_es_lock; 1029 struct list_head i_es_list; 1030 unsigned int i_es_all_nr; /* protected by i_es_lock */ 1031 unsigned int i_es_shk_nr; /* protected by i_es_lock */ 1032 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for 1033 extents to shrink. Protected by 1034 i_es_lock */ 1035 1036 /* ialloc */ 1037 ext4_group_t i_last_alloc_group; 1038 1039 /* allocation reservation info for delalloc */ 1040 /* In case of bigalloc, these refer to clusters rather than blocks */ 1041 unsigned int i_reserved_data_blocks; 1042 unsigned int i_reserved_meta_blocks; 1043 unsigned int i_allocated_meta_blocks; 1044 ext4_lblk_t i_da_metadata_calc_last_lblock; 1045 int i_da_metadata_calc_len; 1046 1047 /* on-disk additional length */ 1048 __u16 i_extra_isize; 1049 1050 /* Indicate the inline data space. */ 1051 u16 i_inline_off; 1052 u16 i_inline_size; 1053 1054 #ifdef CONFIG_QUOTA 1055 /* quota space reservation, managed internally by quota code */ 1056 qsize_t i_reserved_quota; 1057 #endif 1058 1059 /* Lock protecting lists below */ 1060 spinlock_t i_completed_io_lock; 1061 /* 1062 * Completed IOs that need unwritten extents handling and have 1063 * transaction reserved 1064 */ 1065 struct list_head i_rsv_conversion_list; 1066 struct work_struct i_rsv_conversion_work; 1067 atomic_t i_unwritten; /* Nr. of inflight conversions pending */ 1068 1069 spinlock_t i_block_reservation_lock; 1070 1071 /* 1072 * Transactions that contain inode's metadata needed to complete 1073 * fsync and fdatasync, respectively. 1074 */ 1075 tid_t i_sync_tid; 1076 tid_t i_datasync_tid; 1077 1078 #ifdef CONFIG_QUOTA 1079 struct dquot *i_dquot[MAXQUOTAS]; 1080 #endif 1081 1082 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */ 1083 __u32 i_csum_seed; 1084 1085 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1086 /* Encryption params */ 1087 struct ext4_crypt_info *i_crypt_info; 1088 #endif 1089 kprojid_t i_projid; 1090 }; 1091 1092 /* 1093 * File system states 1094 */ 1095 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 1096 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 1097 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 1098 1099 /* 1100 * Misc. filesystem flags 1101 */ 1102 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 1103 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 1104 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 1105 1106 /* 1107 * Mount flags set via mount options or defaults 1108 */ 1109 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 1110 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 1111 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 1112 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 1113 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 1114 #define EXT4_MOUNT_ERRORS_MASK 0x00070 1115 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 1116 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 1117 #ifdef CONFIG_FS_DAX 1118 #define EXT4_MOUNT_DAX 0x00200 /* Direct Access */ 1119 #else 1120 #define EXT4_MOUNT_DAX 0 1121 #endif 1122 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 1123 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 1124 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 1125 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 1126 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 1127 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 1128 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 1129 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 1130 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 1131 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 1132 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 1133 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 1134 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 1135 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 1136 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 1137 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 1138 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 1139 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 1140 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 1141 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 1142 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */ 1143 1144 /* 1145 * Mount flags set either automatically (could not be set by mount option) 1146 * based on per file system feature or property or in special cases such as 1147 * distinguishing between explicit mount option definition and default. 1148 */ 1149 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly 1150 specified delalloc */ 1151 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group 1152 size of blocksize * 8 1153 blocks */ 1154 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated 1155 file systems */ 1156 1157 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly 1158 specified journal checksum */ 1159 1160 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \ 1161 ~EXT4_MOUNT_##opt 1162 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \ 1163 EXT4_MOUNT_##opt 1164 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 1165 EXT4_MOUNT_##opt) 1166 1167 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \ 1168 ~EXT4_MOUNT2_##opt 1169 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \ 1170 EXT4_MOUNT2_##opt 1171 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ 1172 EXT4_MOUNT2_##opt) 1173 1174 #define ext4_test_and_set_bit __test_and_set_bit_le 1175 #define ext4_set_bit __set_bit_le 1176 #define ext4_set_bit_atomic ext2_set_bit_atomic 1177 #define ext4_test_and_clear_bit __test_and_clear_bit_le 1178 #define ext4_clear_bit __clear_bit_le 1179 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 1180 #define ext4_test_bit test_bit_le 1181 #define ext4_find_next_zero_bit find_next_zero_bit_le 1182 #define ext4_find_next_bit find_next_bit_le 1183 1184 extern void ext4_set_bits(void *bm, int cur, int len); 1185 1186 /* 1187 * Maximal mount counts between two filesystem checks 1188 */ 1189 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 1190 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 1191 1192 /* 1193 * Behaviour when detecting errors 1194 */ 1195 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 1196 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 1197 #define EXT4_ERRORS_PANIC 3 /* Panic */ 1198 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 1199 1200 /* Metadata checksum algorithm codes */ 1201 #define EXT4_CRC32C_CHKSUM 1 1202 1203 /* 1204 * Structure of the super block 1205 */ 1206 struct ext4_super_block { 1207 /*00*/ __le32 s_inodes_count; /* Inodes count */ 1208 __le32 s_blocks_count_lo; /* Blocks count */ 1209 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 1210 __le32 s_free_blocks_count_lo; /* Free blocks count */ 1211 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 1212 __le32 s_first_data_block; /* First Data Block */ 1213 __le32 s_log_block_size; /* Block size */ 1214 __le32 s_log_cluster_size; /* Allocation cluster size */ 1215 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 1216 __le32 s_clusters_per_group; /* # Clusters per group */ 1217 __le32 s_inodes_per_group; /* # Inodes per group */ 1218 __le32 s_mtime; /* Mount time */ 1219 /*30*/ __le32 s_wtime; /* Write time */ 1220 __le16 s_mnt_count; /* Mount count */ 1221 __le16 s_max_mnt_count; /* Maximal mount count */ 1222 __le16 s_magic; /* Magic signature */ 1223 __le16 s_state; /* File system state */ 1224 __le16 s_errors; /* Behaviour when detecting errors */ 1225 __le16 s_minor_rev_level; /* minor revision level */ 1226 /*40*/ __le32 s_lastcheck; /* time of last check */ 1227 __le32 s_checkinterval; /* max. time between checks */ 1228 __le32 s_creator_os; /* OS */ 1229 __le32 s_rev_level; /* Revision level */ 1230 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 1231 __le16 s_def_resgid; /* Default gid for reserved blocks */ 1232 /* 1233 * These fields are for EXT4_DYNAMIC_REV superblocks only. 1234 * 1235 * Note: the difference between the compatible feature set and 1236 * the incompatible feature set is that if there is a bit set 1237 * in the incompatible feature set that the kernel doesn't 1238 * know about, it should refuse to mount the filesystem. 1239 * 1240 * e2fsck's requirements are more strict; if it doesn't know 1241 * about a feature in either the compatible or incompatible 1242 * feature set, it must abort and not try to meddle with 1243 * things it doesn't understand... 1244 */ 1245 __le32 s_first_ino; /* First non-reserved inode */ 1246 __le16 s_inode_size; /* size of inode structure */ 1247 __le16 s_block_group_nr; /* block group # of this superblock */ 1248 __le32 s_feature_compat; /* compatible feature set */ 1249 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 1250 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 1251 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 1252 /*78*/ char s_volume_name[16]; /* volume name */ 1253 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 1254 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 1255 /* 1256 * Performance hints. Directory preallocation should only 1257 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 1258 */ 1259 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 1260 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 1261 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 1262 /* 1263 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 1264 */ 1265 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 1266 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 1267 __le32 s_journal_dev; /* device number of journal file */ 1268 __le32 s_last_orphan; /* start of list of inodes to delete */ 1269 __le32 s_hash_seed[4]; /* HTREE hash seed */ 1270 __u8 s_def_hash_version; /* Default hash version to use */ 1271 __u8 s_jnl_backup_type; 1272 __le16 s_desc_size; /* size of group descriptor */ 1273 /*100*/ __le32 s_default_mount_opts; 1274 __le32 s_first_meta_bg; /* First metablock block group */ 1275 __le32 s_mkfs_time; /* When the filesystem was created */ 1276 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 1277 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 1278 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 1279 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 1280 __le32 s_free_blocks_count_hi; /* Free blocks count */ 1281 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1282 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1283 __le32 s_flags; /* Miscellaneous flags */ 1284 __le16 s_raid_stride; /* RAID stride */ 1285 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */ 1286 __le64 s_mmp_block; /* Block for multi-mount protection */ 1287 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1288 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1289 __u8 s_checksum_type; /* metadata checksum algorithm used */ 1290 __u8 s_encryption_level; /* versioning level for encryption */ 1291 __u8 s_reserved_pad; /* Padding to next 32bits */ 1292 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1293 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1294 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1295 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1296 snapshot's future use */ 1297 __le32 s_snapshot_list; /* inode number of the head of the 1298 on-disk snapshot list */ 1299 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1300 __le32 s_error_count; /* number of fs errors */ 1301 __le32 s_first_error_time; /* first time an error happened */ 1302 __le32 s_first_error_ino; /* inode involved in first error */ 1303 __le64 s_first_error_block; /* block involved of first error */ 1304 __u8 s_first_error_func[32]; /* function where the error happened */ 1305 __le32 s_first_error_line; /* line number where error happened */ 1306 __le32 s_last_error_time; /* most recent time of an error */ 1307 __le32 s_last_error_ino; /* inode involved in last error */ 1308 __le32 s_last_error_line; /* line number where error happened */ 1309 __le64 s_last_error_block; /* block involved of last error */ 1310 __u8 s_last_error_func[32]; /* function where the error happened */ 1311 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1312 __u8 s_mount_opts[64]; 1313 __le32 s_usr_quota_inum; /* inode for tracking user quota */ 1314 __le32 s_grp_quota_inum; /* inode for tracking group quota */ 1315 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */ 1316 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */ 1317 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */ 1318 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ 1319 __le32 s_lpf_ino; /* Location of the lost+found inode */ 1320 __le32 s_prj_quota_inum; /* inode for tracking project quota */ 1321 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */ 1322 __le32 s_reserved[98]; /* Padding to the end of the block */ 1323 __le32 s_checksum; /* crc32c(superblock) */ 1324 }; 1325 1326 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1327 1328 #ifdef __KERNEL__ 1329 1330 /* 1331 * run-time mount flags 1332 */ 1333 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 1334 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1335 #define EXT4_MF_TEST_DUMMY_ENCRYPTION 0x0004 1336 1337 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1338 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \ 1339 EXT4_MF_TEST_DUMMY_ENCRYPTION)) 1340 #else 1341 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0) 1342 #endif 1343 1344 /* Number of quota types we support */ 1345 #define EXT4_MAXQUOTAS 3 1346 1347 /* 1348 * fourth extended-fs super-block data in memory 1349 */ 1350 struct ext4_sb_info { 1351 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1352 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1353 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1354 unsigned long s_clusters_per_group; /* Number of clusters in a group */ 1355 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1356 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1357 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1358 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1359 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1360 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1361 unsigned long s_overhead; /* # of fs overhead clusters */ 1362 unsigned int s_cluster_ratio; /* Number of blocks per cluster */ 1363 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */ 1364 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1365 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1366 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1367 struct buffer_head **s_group_desc; 1368 unsigned int s_mount_opt; 1369 unsigned int s_mount_opt2; 1370 unsigned int s_mount_flags; 1371 unsigned int s_def_mount_opt; 1372 ext4_fsblk_t s_sb_block; 1373 atomic64_t s_resv_clusters; 1374 kuid_t s_resuid; 1375 kgid_t s_resgid; 1376 unsigned short s_mount_state; 1377 unsigned short s_pad; 1378 int s_addr_per_block_bits; 1379 int s_desc_per_block_bits; 1380 int s_inode_size; 1381 int s_first_ino; 1382 unsigned int s_inode_readahead_blks; 1383 unsigned int s_inode_goal; 1384 spinlock_t s_next_gen_lock; 1385 u32 s_next_generation; 1386 u32 s_hash_seed[4]; 1387 int s_def_hash_version; 1388 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1389 struct percpu_counter s_freeclusters_counter; 1390 struct percpu_counter s_freeinodes_counter; 1391 struct percpu_counter s_dirs_counter; 1392 struct percpu_counter s_dirtyclusters_counter; 1393 struct blockgroup_lock *s_blockgroup_lock; 1394 struct proc_dir_entry *s_proc; 1395 struct kobject s_kobj; 1396 struct completion s_kobj_unregister; 1397 struct super_block *s_sb; 1398 1399 /* Journaling */ 1400 struct journal_s *s_journal; 1401 struct list_head s_orphan; 1402 struct mutex s_orphan_lock; 1403 unsigned long s_resize_flags; /* Flags indicating if there 1404 is a resizer */ 1405 unsigned long s_commit_interval; 1406 u32 s_max_batch_time; 1407 u32 s_min_batch_time; 1408 struct block_device *journal_bdev; 1409 #ifdef CONFIG_QUOTA 1410 char *s_qf_names[EXT4_MAXQUOTAS]; /* Names of quota files with journalled quota */ 1411 int s_jquota_fmt; /* Format of quota to use */ 1412 #endif 1413 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1414 struct rb_root system_blks; 1415 1416 #ifdef EXTENTS_STATS 1417 /* ext4 extents stats */ 1418 unsigned long s_ext_min; 1419 unsigned long s_ext_max; 1420 unsigned long s_depth_max; 1421 spinlock_t s_ext_stats_lock; 1422 unsigned long s_ext_blocks; 1423 unsigned long s_ext_extents; 1424 #endif 1425 1426 /* for buddy allocator */ 1427 struct ext4_group_info ***s_group_info; 1428 struct inode *s_buddy_cache; 1429 spinlock_t s_md_lock; 1430 unsigned short *s_mb_offsets; 1431 unsigned int *s_mb_maxs; 1432 unsigned int s_group_info_size; 1433 1434 /* tunables */ 1435 unsigned long s_stripe; 1436 unsigned int s_mb_stream_request; 1437 unsigned int s_mb_max_to_scan; 1438 unsigned int s_mb_min_to_scan; 1439 unsigned int s_mb_stats; 1440 unsigned int s_mb_order2_reqs; 1441 unsigned int s_mb_group_prealloc; 1442 unsigned int s_max_dir_size_kb; 1443 /* where last allocation was done - for stream allocation */ 1444 unsigned long s_mb_last_group; 1445 unsigned long s_mb_last_start; 1446 1447 /* stats for buddy allocator */ 1448 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1449 atomic_t s_bal_success; /* we found long enough chunks */ 1450 atomic_t s_bal_allocated; /* in blocks */ 1451 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1452 atomic_t s_bal_goals; /* goal hits */ 1453 atomic_t s_bal_breaks; /* too long searches */ 1454 atomic_t s_bal_2orders; /* 2^order hits */ 1455 spinlock_t s_bal_lock; 1456 unsigned long s_mb_buddies_generated; 1457 unsigned long long s_mb_generation_time; 1458 atomic_t s_mb_lost_chunks; 1459 atomic_t s_mb_preallocated; 1460 atomic_t s_mb_discarded; 1461 atomic_t s_lock_busy; 1462 1463 /* locality groups */ 1464 struct ext4_locality_group __percpu *s_locality_groups; 1465 1466 /* for write statistics */ 1467 unsigned long s_sectors_written_start; 1468 u64 s_kbytes_written; 1469 1470 /* the size of zero-out chunk */ 1471 unsigned int s_extent_max_zeroout_kb; 1472 1473 unsigned int s_log_groups_per_flex; 1474 struct flex_groups *s_flex_groups; 1475 ext4_group_t s_flex_groups_allocated; 1476 1477 /* workqueue for reserved extent conversions (buffered io) */ 1478 struct workqueue_struct *rsv_conversion_wq; 1479 1480 /* timer for periodic error stats printing */ 1481 struct timer_list s_err_report; 1482 1483 /* Lazy inode table initialization info */ 1484 struct ext4_li_request *s_li_request; 1485 /* Wait multiplier for lazy initialization thread */ 1486 unsigned int s_li_wait_mult; 1487 1488 /* Kernel thread for multiple mount protection */ 1489 struct task_struct *s_mmp_tsk; 1490 1491 /* record the last minlen when FITRIM is called. */ 1492 atomic_t s_last_trim_minblks; 1493 1494 /* Reference to checksum algorithm driver via cryptoapi */ 1495 struct crypto_shash *s_chksum_driver; 1496 1497 /* Precomputed FS UUID checksum for seeding other checksums */ 1498 __u32 s_csum_seed; 1499 1500 /* Reclaim extents from extent status tree */ 1501 struct shrinker s_es_shrinker; 1502 struct list_head s_es_list; /* List of inodes with reclaimable extents */ 1503 long s_es_nr_inode; 1504 struct ext4_es_stats s_es_stats; 1505 struct mb_cache *s_mb_cache; 1506 spinlock_t s_es_lock ____cacheline_aligned_in_smp; 1507 1508 /* Ratelimit ext4 messages. */ 1509 struct ratelimit_state s_err_ratelimit_state; 1510 struct ratelimit_state s_warning_ratelimit_state; 1511 struct ratelimit_state s_msg_ratelimit_state; 1512 1513 /* Barrier between changing inodes' journal flags and writepages ops. */ 1514 struct percpu_rw_semaphore s_journal_flag_rwsem; 1515 }; 1516 1517 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1518 { 1519 return sb->s_fs_info; 1520 } 1521 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1522 { 1523 return container_of(inode, struct ext4_inode_info, vfs_inode); 1524 } 1525 1526 static inline struct timespec ext4_current_time(struct inode *inode) 1527 { 1528 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1529 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1530 } 1531 1532 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1533 { 1534 return ino == EXT4_ROOT_INO || 1535 ino == EXT4_USR_QUOTA_INO || 1536 ino == EXT4_GRP_QUOTA_INO || 1537 ino == EXT4_BOOT_LOADER_INO || 1538 ino == EXT4_JOURNAL_INO || 1539 ino == EXT4_RESIZE_INO || 1540 (ino >= EXT4_FIRST_INO(sb) && 1541 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1542 } 1543 1544 /* 1545 * Inode dynamic state flags 1546 */ 1547 enum { 1548 EXT4_STATE_JDATA, /* journaled data exists */ 1549 EXT4_STATE_NEW, /* inode is newly created */ 1550 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1551 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1552 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1553 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1554 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1555 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1556 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read 1557 nolocking */ 1558 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */ 1559 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */ 1560 }; 1561 1562 #define EXT4_INODE_BIT_FNS(name, field, offset) \ 1563 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1564 { \ 1565 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1566 } \ 1567 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1568 { \ 1569 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1570 } \ 1571 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1572 { \ 1573 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \ 1574 } 1575 1576 /* Add these declarations here only so that these functions can be 1577 * found by name. Otherwise, they are very hard to locate. */ 1578 static inline int ext4_test_inode_flag(struct inode *inode, int bit); 1579 static inline void ext4_set_inode_flag(struct inode *inode, int bit); 1580 static inline void ext4_clear_inode_flag(struct inode *inode, int bit); 1581 EXT4_INODE_BIT_FNS(flag, flags, 0) 1582 1583 /* Add these declarations here only so that these functions can be 1584 * found by name. Otherwise, they are very hard to locate. */ 1585 static inline int ext4_test_inode_state(struct inode *inode, int bit); 1586 static inline void ext4_set_inode_state(struct inode *inode, int bit); 1587 static inline void ext4_clear_inode_state(struct inode *inode, int bit); 1588 #if (BITS_PER_LONG < 64) 1589 EXT4_INODE_BIT_FNS(state, state_flags, 0) 1590 1591 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1592 { 1593 (ei)->i_state_flags = 0; 1594 } 1595 #else 1596 EXT4_INODE_BIT_FNS(state, flags, 32) 1597 1598 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) 1599 { 1600 /* We depend on the fact that callers will set i_flags */ 1601 } 1602 #endif 1603 #else 1604 /* Assume that user mode programs are passing in an ext4fs superblock, not 1605 * a kernel struct super_block. This will allow us to call the feature-test 1606 * macros from user land. */ 1607 #define EXT4_SB(sb) (sb) 1608 #endif 1609 1610 /* 1611 * Returns true if the inode is inode is encrypted 1612 */ 1613 static inline int ext4_encrypted_inode(struct inode *inode) 1614 { 1615 #ifdef CONFIG_EXT4_FS_ENCRYPTION 1616 return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT); 1617 #else 1618 return 0; 1619 #endif 1620 } 1621 1622 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1623 1624 /* 1625 * Codes for operating systems 1626 */ 1627 #define EXT4_OS_LINUX 0 1628 #define EXT4_OS_HURD 1 1629 #define EXT4_OS_MASIX 2 1630 #define EXT4_OS_FREEBSD 3 1631 #define EXT4_OS_LITES 4 1632 1633 /* 1634 * Revision levels 1635 */ 1636 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1637 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1638 1639 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1640 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1641 1642 #define EXT4_GOOD_OLD_INODE_SIZE 128 1643 1644 /* 1645 * Feature set definitions 1646 */ 1647 1648 /* Use the ext4_{has,set,clear}_feature_* helpers; these will be removed */ 1649 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1650 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1651 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1652 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1653 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1654 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1655 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1656 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1657 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1658 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1659 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1660 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1661 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1662 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1663 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1664 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1665 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1666 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1667 1668 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1669 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1670 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1671 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1672 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1673 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1674 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 1675 1676 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1677 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1678 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1679 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1680 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1681 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1682 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1683 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 1684 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 1685 /* 1686 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When 1687 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as 1688 * all other data structures' checksums. However, the METADATA_CSUM and 1689 * GDT_CSUM bits are mutually exclusive. 1690 */ 1691 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 1692 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 1693 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000 1694 1695 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1696 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1697 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1698 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1699 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1700 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1701 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1702 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1703 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1704 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1705 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1706 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000 1707 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */ 1708 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */ 1709 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000 1710 1711 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \ 1712 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1713 { \ 1714 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1715 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \ 1716 } \ 1717 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1718 { \ 1719 EXT4_SB(sb)->s_es->s_feature_compat |= \ 1720 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1721 } \ 1722 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1723 { \ 1724 EXT4_SB(sb)->s_es->s_feature_compat &= \ 1725 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \ 1726 } 1727 1728 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \ 1729 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1730 { \ 1731 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1732 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \ 1733 } \ 1734 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1735 { \ 1736 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \ 1737 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1738 } \ 1739 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1740 { \ 1741 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \ 1742 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \ 1743 } 1744 1745 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \ 1746 static inline bool ext4_has_feature_##name(struct super_block *sb) \ 1747 { \ 1748 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1749 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \ 1750 } \ 1751 static inline void ext4_set_feature_##name(struct super_block *sb) \ 1752 { \ 1753 EXT4_SB(sb)->s_es->s_feature_incompat |= \ 1754 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1755 } \ 1756 static inline void ext4_clear_feature_##name(struct super_block *sb) \ 1757 { \ 1758 EXT4_SB(sb)->s_es->s_feature_incompat &= \ 1759 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \ 1760 } 1761 1762 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC) 1763 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES) 1764 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL) 1765 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR) 1766 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE) 1767 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX) 1768 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2) 1769 1770 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER) 1771 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE) 1772 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR) 1773 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE) 1774 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM) 1775 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK) 1776 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE) 1777 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA) 1778 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC) 1779 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM) 1780 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY) 1781 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT) 1782 1783 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION) 1784 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE) 1785 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER) 1786 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV) 1787 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG) 1788 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS) 1789 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT) 1790 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP) 1791 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG) 1792 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE) 1793 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA) 1794 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED) 1795 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR) 1796 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA) 1797 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT) 1798 1799 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1800 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1801 EXT4_FEATURE_INCOMPAT_META_BG) 1802 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1803 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1804 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1805 1806 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1807 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1808 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1809 EXT4_FEATURE_INCOMPAT_META_BG) 1810 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1811 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1812 EXT4_FEATURE_RO_COMPAT_BTREE_DIR) 1813 1814 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR 1815 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1816 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1817 EXT4_FEATURE_INCOMPAT_META_BG| \ 1818 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1819 EXT4_FEATURE_INCOMPAT_64BIT| \ 1820 EXT4_FEATURE_INCOMPAT_FLEX_BG| \ 1821 EXT4_FEATURE_INCOMPAT_MMP | \ 1822 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \ 1823 EXT4_FEATURE_INCOMPAT_ENCRYPT | \ 1824 EXT4_FEATURE_INCOMPAT_CSUM_SEED) 1825 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1826 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1827 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1828 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1829 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1830 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1831 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\ 1832 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\ 1833 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\ 1834 EXT4_FEATURE_RO_COMPAT_QUOTA |\ 1835 EXT4_FEATURE_RO_COMPAT_PROJECT) 1836 1837 #define EXTN_FEATURE_FUNCS(ver) \ 1838 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \ 1839 { \ 1840 return ((EXT4_SB(sb)->s_es->s_feature_compat & \ 1841 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \ 1842 } \ 1843 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \ 1844 { \ 1845 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \ 1846 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \ 1847 } \ 1848 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \ 1849 { \ 1850 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \ 1851 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \ 1852 } 1853 1854 EXTN_FEATURE_FUNCS(2) 1855 EXTN_FEATURE_FUNCS(3) 1856 EXTN_FEATURE_FUNCS(4) 1857 1858 static inline bool ext4_has_compat_features(struct super_block *sb) 1859 { 1860 return (EXT4_SB(sb)->s_es->s_feature_compat != 0); 1861 } 1862 static inline bool ext4_has_ro_compat_features(struct super_block *sb) 1863 { 1864 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0); 1865 } 1866 static inline bool ext4_has_incompat_features(struct super_block *sb) 1867 { 1868 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0); 1869 } 1870 1871 /* 1872 * Default values for user and/or group using reserved blocks 1873 */ 1874 #define EXT4_DEF_RESUID 0 1875 #define EXT4_DEF_RESGID 0 1876 1877 /* 1878 * Default project ID 1879 */ 1880 #define EXT4_DEF_PROJID 0 1881 1882 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1883 1884 /* 1885 * Default mount options 1886 */ 1887 #define EXT4_DEFM_DEBUG 0x0001 1888 #define EXT4_DEFM_BSDGROUPS 0x0002 1889 #define EXT4_DEFM_XATTR_USER 0x0004 1890 #define EXT4_DEFM_ACL 0x0008 1891 #define EXT4_DEFM_UID16 0x0010 1892 #define EXT4_DEFM_JMODE 0x0060 1893 #define EXT4_DEFM_JMODE_DATA 0x0020 1894 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1895 #define EXT4_DEFM_JMODE_WBACK 0x0060 1896 #define EXT4_DEFM_NOBARRIER 0x0100 1897 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1898 #define EXT4_DEFM_DISCARD 0x0400 1899 #define EXT4_DEFM_NODELALLOC 0x0800 1900 1901 /* 1902 * Default journal batch times 1903 */ 1904 #define EXT4_DEF_MIN_BATCH_TIME 0 1905 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1906 1907 /* 1908 * Minimum number of groups in a flexgroup before we separate out 1909 * directories into the first block group of a flexgroup 1910 */ 1911 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1912 1913 /* 1914 * Structure of a directory entry 1915 */ 1916 #define EXT4_NAME_LEN 255 1917 1918 struct ext4_dir_entry { 1919 __le32 inode; /* Inode number */ 1920 __le16 rec_len; /* Directory entry length */ 1921 __le16 name_len; /* Name length */ 1922 char name[EXT4_NAME_LEN]; /* File name */ 1923 }; 1924 1925 /* 1926 * The new version of the directory entry. Since EXT4 structures are 1927 * stored in intel byte order, and the name_len field could never be 1928 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1929 * file_type field. 1930 */ 1931 struct ext4_dir_entry_2 { 1932 __le32 inode; /* Inode number */ 1933 __le16 rec_len; /* Directory entry length */ 1934 __u8 name_len; /* Name length */ 1935 __u8 file_type; 1936 char name[EXT4_NAME_LEN]; /* File name */ 1937 }; 1938 1939 /* 1940 * This is a bogus directory entry at the end of each leaf block that 1941 * records checksums. 1942 */ 1943 struct ext4_dir_entry_tail { 1944 __le32 det_reserved_zero1; /* Pretend to be unused */ 1945 __le16 det_rec_len; /* 12 */ 1946 __u8 det_reserved_zero2; /* Zero name length */ 1947 __u8 det_reserved_ft; /* 0xDE, fake file type */ 1948 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */ 1949 }; 1950 1951 #define EXT4_DIRENT_TAIL(block, blocksize) \ 1952 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \ 1953 ((blocksize) - \ 1954 sizeof(struct ext4_dir_entry_tail)))) 1955 1956 /* 1957 * Ext4 directory file types. Only the low 3 bits are used. The 1958 * other bits are reserved for now. 1959 */ 1960 #define EXT4_FT_UNKNOWN 0 1961 #define EXT4_FT_REG_FILE 1 1962 #define EXT4_FT_DIR 2 1963 #define EXT4_FT_CHRDEV 3 1964 #define EXT4_FT_BLKDEV 4 1965 #define EXT4_FT_FIFO 5 1966 #define EXT4_FT_SOCK 6 1967 #define EXT4_FT_SYMLINK 7 1968 1969 #define EXT4_FT_MAX 8 1970 1971 #define EXT4_FT_DIR_CSUM 0xDE 1972 1973 /* 1974 * EXT4_DIR_PAD defines the directory entries boundaries 1975 * 1976 * NOTE: It must be a multiple of 4 1977 */ 1978 #define EXT4_DIR_PAD 4 1979 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1980 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1981 ~EXT4_DIR_ROUND) 1982 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1983 1984 /* 1985 * If we ever get support for fs block sizes > page_size, we'll need 1986 * to remove the #if statements in the next two functions... 1987 */ 1988 static inline unsigned int 1989 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1990 { 1991 unsigned len = le16_to_cpu(dlen); 1992 1993 #if (PAGE_SIZE >= 65536) 1994 if (len == EXT4_MAX_REC_LEN || len == 0) 1995 return blocksize; 1996 return (len & 65532) | ((len & 3) << 16); 1997 #else 1998 return len; 1999 #endif 2000 } 2001 2002 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 2003 { 2004 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 2005 BUG(); 2006 #if (PAGE_SIZE >= 65536) 2007 if (len < 65536) 2008 return cpu_to_le16(len); 2009 if (len == blocksize) { 2010 if (blocksize == 65536) 2011 return cpu_to_le16(EXT4_MAX_REC_LEN); 2012 else 2013 return cpu_to_le16(0); 2014 } 2015 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 2016 #else 2017 return cpu_to_le16(len); 2018 #endif 2019 } 2020 2021 /* 2022 * Hash Tree Directory indexing 2023 * (c) Daniel Phillips, 2001 2024 */ 2025 2026 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \ 2027 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 2028 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 2029 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 2030 2031 /* Legal values for the dx_root hash_version field: */ 2032 2033 #define DX_HASH_LEGACY 0 2034 #define DX_HASH_HALF_MD4 1 2035 #define DX_HASH_TEA 2 2036 #define DX_HASH_LEGACY_UNSIGNED 3 2037 #define DX_HASH_HALF_MD4_UNSIGNED 4 2038 #define DX_HASH_TEA_UNSIGNED 5 2039 2040 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, 2041 const void *address, unsigned int length) 2042 { 2043 struct { 2044 struct shash_desc shash; 2045 char ctx[4]; 2046 } desc; 2047 int err; 2048 2049 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); 2050 2051 desc.shash.tfm = sbi->s_chksum_driver; 2052 desc.shash.flags = 0; 2053 *(u32 *)desc.ctx = crc; 2054 2055 err = crypto_shash_update(&desc.shash, address, length); 2056 BUG_ON(err); 2057 2058 return *(u32 *)desc.ctx; 2059 } 2060 2061 #ifdef __KERNEL__ 2062 2063 /* hash info structure used by the directory hash */ 2064 struct dx_hash_info 2065 { 2066 u32 hash; 2067 u32 minor_hash; 2068 int hash_version; 2069 u32 *seed; 2070 }; 2071 2072 2073 /* 32 and 64 bit signed EOF for dx directories */ 2074 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 2075 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 2076 2077 2078 /* 2079 * Control parameters used by ext4_htree_next_block 2080 */ 2081 #define HASH_NB_ALWAYS 1 2082 2083 struct ext4_filename { 2084 const struct qstr *usr_fname; 2085 struct ext4_str disk_name; 2086 struct dx_hash_info hinfo; 2087 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2088 struct ext4_str crypto_buf; 2089 #endif 2090 }; 2091 2092 #define fname_name(p) ((p)->disk_name.name) 2093 #define fname_len(p) ((p)->disk_name.len) 2094 2095 /* 2096 * Describe an inode's exact location on disk and in memory 2097 */ 2098 struct ext4_iloc 2099 { 2100 struct buffer_head *bh; 2101 unsigned long offset; 2102 ext4_group_t block_group; 2103 }; 2104 2105 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 2106 { 2107 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 2108 } 2109 2110 /* 2111 * This structure is stuffed into the struct file's private_data field 2112 * for directories. It is where we put information so that we can do 2113 * readdir operations in hash tree order. 2114 */ 2115 struct dir_private_info { 2116 struct rb_root root; 2117 struct rb_node *curr_node; 2118 struct fname *extra_fname; 2119 loff_t last_pos; 2120 __u32 curr_hash; 2121 __u32 curr_minor_hash; 2122 __u32 next_hash; 2123 }; 2124 2125 /* calculate the first block number of the group */ 2126 static inline ext4_fsblk_t 2127 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 2128 { 2129 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 2130 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 2131 } 2132 2133 /* 2134 * Special error return code only used by dx_probe() and its callers. 2135 */ 2136 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1)) 2137 2138 /* 2139 * Timeout and state flag for lazy initialization inode thread. 2140 */ 2141 #define EXT4_DEF_LI_WAIT_MULT 10 2142 #define EXT4_DEF_LI_MAX_START_DELAY 5 2143 #define EXT4_LAZYINIT_QUIT 0x0001 2144 #define EXT4_LAZYINIT_RUNNING 0x0002 2145 2146 /* 2147 * Lazy inode table initialization info 2148 */ 2149 struct ext4_lazy_init { 2150 unsigned long li_state; 2151 struct list_head li_request_list; 2152 struct mutex li_list_mtx; 2153 }; 2154 2155 struct ext4_li_request { 2156 struct super_block *lr_super; 2157 struct ext4_sb_info *lr_sbi; 2158 ext4_group_t lr_next_group; 2159 struct list_head lr_request; 2160 unsigned long lr_next_sched; 2161 unsigned long lr_timeout; 2162 }; 2163 2164 struct ext4_features { 2165 struct kobject f_kobj; 2166 struct completion f_kobj_unregister; 2167 }; 2168 2169 /* 2170 * This structure will be used for multiple mount protection. It will be 2171 * written into the block number saved in the s_mmp_block field in the 2172 * superblock. Programs that check MMP should assume that if 2173 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe 2174 * to use the filesystem, regardless of how old the timestamp is. 2175 */ 2176 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */ 2177 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */ 2178 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */ 2179 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */ 2180 2181 struct mmp_struct { 2182 __le32 mmp_magic; /* Magic number for MMP */ 2183 __le32 mmp_seq; /* Sequence no. updated periodically */ 2184 2185 /* 2186 * mmp_time, mmp_nodename & mmp_bdevname are only used for information 2187 * purposes and do not affect the correctness of the algorithm 2188 */ 2189 __le64 mmp_time; /* Time last updated */ 2190 char mmp_nodename[64]; /* Node which last updated MMP block */ 2191 char mmp_bdevname[32]; /* Bdev which last updated MMP block */ 2192 2193 /* 2194 * mmp_check_interval is used to verify if the MMP block has been 2195 * updated on the block device. The value is updated based on the 2196 * maximum time to write the MMP block during an update cycle. 2197 */ 2198 __le16 mmp_check_interval; 2199 2200 __le16 mmp_pad1; 2201 __le32 mmp_pad2[226]; 2202 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */ 2203 }; 2204 2205 /* arguments passed to the mmp thread */ 2206 struct mmpd_data { 2207 struct buffer_head *bh; /* bh from initial read_mmp_block() */ 2208 struct super_block *sb; /* super block of the fs */ 2209 }; 2210 2211 /* 2212 * Check interval multiplier 2213 * The MMP block is written every update interval and initially checked every 2214 * update interval x the multiplier (the value is then adapted based on the 2215 * write latency). The reason is that writes can be delayed under load and we 2216 * don't want readers to incorrectly assume that the filesystem is no longer 2217 * in use. 2218 */ 2219 #define EXT4_MMP_CHECK_MULT 2UL 2220 2221 /* 2222 * Minimum interval for MMP checking in seconds. 2223 */ 2224 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL 2225 2226 /* 2227 * Maximum interval for MMP checking in seconds. 2228 */ 2229 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL 2230 2231 /* 2232 * Function prototypes 2233 */ 2234 2235 /* 2236 * Ok, these declarations are also in <linux/kernel.h> but none of the 2237 * ext4 source programs needs to include it so they are duplicated here. 2238 */ 2239 # define NORET_TYPE /**/ 2240 # define ATTRIB_NORET __attribute__((noreturn)) 2241 # define NORET_AND noreturn, 2242 2243 /* bitmap.c */ 2244 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars); 2245 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2246 struct ext4_group_desc *gdp, 2247 struct buffer_head *bh, int sz); 2248 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2249 struct ext4_group_desc *gdp, 2250 struct buffer_head *bh, int sz); 2251 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group, 2252 struct ext4_group_desc *gdp, 2253 struct buffer_head *bh); 2254 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group, 2255 struct ext4_group_desc *gdp, 2256 struct buffer_head *bh); 2257 2258 /* balloc.c */ 2259 extern void ext4_get_group_no_and_offset(struct super_block *sb, 2260 ext4_fsblk_t blocknr, 2261 ext4_group_t *blockgrpp, 2262 ext4_grpblk_t *offsetp); 2263 extern ext4_group_t ext4_get_group_number(struct super_block *sb, 2264 ext4_fsblk_t block); 2265 2266 extern unsigned int ext4_block_group(struct super_block *sb, 2267 ext4_fsblk_t blocknr); 2268 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 2269 ext4_fsblk_t blocknr); 2270 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 2271 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 2272 ext4_group_t group); 2273 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 2274 ext4_fsblk_t goal, 2275 unsigned int flags, 2276 unsigned long *count, 2277 int *errp); 2278 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi, 2279 s64 nclusters, unsigned int flags); 2280 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *); 2281 extern void ext4_check_blocks_bitmap(struct super_block *); 2282 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 2283 ext4_group_t block_group, 2284 struct buffer_head ** bh); 2285 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 2286 2287 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb, 2288 ext4_group_t block_group); 2289 extern int ext4_wait_block_bitmap(struct super_block *sb, 2290 ext4_group_t block_group, 2291 struct buffer_head *bh); 2292 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 2293 ext4_group_t block_group); 2294 extern unsigned ext4_free_clusters_after_init(struct super_block *sb, 2295 ext4_group_t block_group, 2296 struct ext4_group_desc *gdp); 2297 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); 2298 2299 /* crypto_policy.c */ 2300 int ext4_is_child_context_consistent_with_parent(struct inode *parent, 2301 struct inode *child); 2302 int ext4_inherit_context(struct inode *parent, struct inode *child); 2303 void ext4_to_hex(char *dst, char *src, size_t src_size); 2304 int ext4_process_policy(const struct ext4_encryption_policy *policy, 2305 struct inode *inode); 2306 int ext4_get_policy(struct inode *inode, 2307 struct ext4_encryption_policy *policy); 2308 2309 /* crypto.c */ 2310 extern struct kmem_cache *ext4_crypt_info_cachep; 2311 bool ext4_valid_contents_enc_mode(uint32_t mode); 2312 uint32_t ext4_validate_encryption_key_size(uint32_t mode, uint32_t size); 2313 extern struct workqueue_struct *ext4_read_workqueue; 2314 struct ext4_crypto_ctx *ext4_get_crypto_ctx(struct inode *inode, 2315 gfp_t gfp_flags); 2316 void ext4_release_crypto_ctx(struct ext4_crypto_ctx *ctx); 2317 void ext4_restore_control_page(struct page *data_page); 2318 struct page *ext4_encrypt(struct inode *inode, 2319 struct page *plaintext_page, 2320 gfp_t gfp_flags); 2321 int ext4_decrypt(struct page *page); 2322 int ext4_encrypted_zeroout(struct inode *inode, ext4_lblk_t lblk, 2323 ext4_fsblk_t pblk, ext4_lblk_t len); 2324 extern const struct dentry_operations ext4_encrypted_d_ops; 2325 2326 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2327 int ext4_init_crypto(void); 2328 void ext4_exit_crypto(void); 2329 static inline int ext4_sb_has_crypto(struct super_block *sb) 2330 { 2331 return ext4_has_feature_encrypt(sb); 2332 } 2333 #else 2334 static inline int ext4_init_crypto(void) { return 0; } 2335 static inline void ext4_exit_crypto(void) { } 2336 static inline int ext4_sb_has_crypto(struct super_block *sb) 2337 { 2338 return 0; 2339 } 2340 #endif 2341 2342 /* crypto_fname.c */ 2343 bool ext4_valid_filenames_enc_mode(uint32_t mode); 2344 u32 ext4_fname_crypto_round_up(u32 size, u32 blksize); 2345 unsigned ext4_fname_encrypted_size(struct inode *inode, u32 ilen); 2346 int ext4_fname_crypto_alloc_buffer(struct inode *inode, 2347 u32 ilen, struct ext4_str *crypto_str); 2348 int _ext4_fname_disk_to_usr(struct inode *inode, 2349 struct dx_hash_info *hinfo, 2350 const struct ext4_str *iname, 2351 struct ext4_str *oname); 2352 int ext4_fname_disk_to_usr(struct inode *inode, 2353 struct dx_hash_info *hinfo, 2354 const struct ext4_dir_entry_2 *de, 2355 struct ext4_str *oname); 2356 int ext4_fname_usr_to_disk(struct inode *inode, 2357 const struct qstr *iname, 2358 struct ext4_str *oname); 2359 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2360 void ext4_fname_crypto_free_buffer(struct ext4_str *crypto_str); 2361 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname, 2362 int lookup, struct ext4_filename *fname); 2363 void ext4_fname_free_filename(struct ext4_filename *fname); 2364 #else 2365 static inline 2366 int ext4_setup_fname_crypto(struct inode *inode) 2367 { 2368 return 0; 2369 } 2370 static inline void ext4_fname_crypto_free_buffer(struct ext4_str *p) { } 2371 static inline int ext4_fname_setup_filename(struct inode *dir, 2372 const struct qstr *iname, 2373 int lookup, struct ext4_filename *fname) 2374 { 2375 fname->usr_fname = iname; 2376 fname->disk_name.name = (unsigned char *) iname->name; 2377 fname->disk_name.len = iname->len; 2378 return 0; 2379 } 2380 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { } 2381 #endif 2382 2383 2384 /* crypto_key.c */ 2385 void ext4_free_crypt_info(struct ext4_crypt_info *ci); 2386 void ext4_free_encryption_info(struct inode *inode, struct ext4_crypt_info *ci); 2387 int _ext4_get_encryption_info(struct inode *inode); 2388 2389 #ifdef CONFIG_EXT4_FS_ENCRYPTION 2390 int ext4_has_encryption_key(struct inode *inode); 2391 2392 static inline int ext4_get_encryption_info(struct inode *inode) 2393 { 2394 struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info; 2395 2396 if (!ci || 2397 (ci->ci_keyring_key && 2398 (ci->ci_keyring_key->flags & ((1 << KEY_FLAG_INVALIDATED) | 2399 (1 << KEY_FLAG_REVOKED) | 2400 (1 << KEY_FLAG_DEAD))))) 2401 return _ext4_get_encryption_info(inode); 2402 return 0; 2403 } 2404 2405 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode) 2406 { 2407 return EXT4_I(inode)->i_crypt_info; 2408 } 2409 2410 #else 2411 static inline int ext4_has_encryption_key(struct inode *inode) 2412 { 2413 return 0; 2414 } 2415 static inline int ext4_get_encryption_info(struct inode *inode) 2416 { 2417 return 0; 2418 } 2419 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode) 2420 { 2421 return NULL; 2422 } 2423 #endif 2424 2425 2426 /* dir.c */ 2427 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 2428 struct file *, 2429 struct ext4_dir_entry_2 *, 2430 struct buffer_head *, char *, int, 2431 unsigned int); 2432 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \ 2433 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \ 2434 (de), (bh), (buf), (size), (offset))) 2435 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 2436 __u32 minor_hash, 2437 struct ext4_dir_entry_2 *dirent, 2438 struct ext4_str *ent_name); 2439 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 2440 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode, 2441 struct buffer_head *bh, 2442 void *buf, int buf_size, 2443 struct ext4_filename *fname, 2444 struct ext4_dir_entry_2 **dest_de); 2445 int ext4_insert_dentry(struct inode *dir, 2446 struct inode *inode, 2447 struct ext4_dir_entry_2 *de, 2448 int buf_size, 2449 struct ext4_filename *fname); 2450 static inline void ext4_update_dx_flag(struct inode *inode) 2451 { 2452 if (!ext4_has_feature_dir_index(inode->i_sb)) 2453 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX); 2454 } 2455 static unsigned char ext4_filetype_table[] = { 2456 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 2457 }; 2458 2459 static inline unsigned char get_dtype(struct super_block *sb, int filetype) 2460 { 2461 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX) 2462 return DT_UNKNOWN; 2463 2464 return ext4_filetype_table[filetype]; 2465 } 2466 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh, 2467 void *buf, int buf_size); 2468 2469 /* fsync.c */ 2470 extern int ext4_sync_file(struct file *, loff_t, loff_t, int); 2471 2472 /* hash.c */ 2473 extern int ext4fs_dirhash(const char *name, int len, struct 2474 dx_hash_info *hinfo); 2475 2476 /* ialloc.c */ 2477 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t, 2478 const struct qstr *qstr, __u32 goal, 2479 uid_t *owner, int handle_type, 2480 unsigned int line_no, int nblocks); 2481 2482 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \ 2483 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \ 2484 0, 0, 0) 2485 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \ 2486 type, nblocks) \ 2487 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \ 2488 (type), __LINE__, (nblocks)) 2489 2490 2491 extern void ext4_free_inode(handle_t *, struct inode *); 2492 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 2493 extern unsigned long ext4_count_free_inodes(struct super_block *); 2494 extern unsigned long ext4_count_dirs(struct super_block *); 2495 extern void ext4_check_inodes_bitmap(struct super_block *); 2496 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 2497 extern int ext4_init_inode_table(struct super_block *sb, 2498 ext4_group_t group, int barrier); 2499 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate); 2500 2501 /* mballoc.c */ 2502 extern const struct file_operations ext4_seq_mb_groups_fops; 2503 extern long ext4_mb_stats; 2504 extern long ext4_mb_max_to_scan; 2505 extern int ext4_mb_init(struct super_block *); 2506 extern int ext4_mb_release(struct super_block *); 2507 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 2508 struct ext4_allocation_request *, int *); 2509 extern int ext4_mb_reserve_blocks(struct super_block *, int); 2510 extern void ext4_discard_preallocations(struct inode *); 2511 extern int __init ext4_init_mballoc(void); 2512 extern void ext4_exit_mballoc(void); 2513 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 2514 struct buffer_head *bh, ext4_fsblk_t block, 2515 unsigned long count, int flags); 2516 extern int ext4_mb_alloc_groupinfo(struct super_block *sb, 2517 ext4_group_t ngroups); 2518 extern int ext4_mb_add_groupinfo(struct super_block *sb, 2519 ext4_group_t i, struct ext4_group_desc *desc); 2520 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, 2521 ext4_fsblk_t block, unsigned long count); 2522 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *); 2523 2524 /* inode.c */ 2525 int ext4_inode_is_fast_symlink(struct inode *inode); 2526 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int); 2527 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int); 2528 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock, 2529 struct buffer_head *bh_result, int create); 2530 int ext4_dax_get_block(struct inode *inode, sector_t iblock, 2531 struct buffer_head *bh_result, int create); 2532 int ext4_get_block(struct inode *inode, sector_t iblock, 2533 struct buffer_head *bh_result, int create); 2534 int ext4_dio_get_block(struct inode *inode, sector_t iblock, 2535 struct buffer_head *bh_result, int create); 2536 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, 2537 struct buffer_head *bh, int create); 2538 int ext4_walk_page_buffers(handle_t *handle, 2539 struct buffer_head *head, 2540 unsigned from, 2541 unsigned to, 2542 int *partial, 2543 int (*fn)(handle_t *handle, 2544 struct buffer_head *bh)); 2545 int do_journal_get_write_access(handle_t *handle, 2546 struct buffer_head *bh); 2547 #define FALL_BACK_TO_NONDELALLOC 1 2548 #define CONVERT_INLINE_DATA 2 2549 2550 extern struct inode *ext4_iget(struct super_block *, unsigned long); 2551 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long); 2552 extern int ext4_write_inode(struct inode *, struct writeback_control *); 2553 extern int ext4_setattr(struct dentry *, struct iattr *); 2554 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 2555 struct kstat *stat); 2556 extern void ext4_evict_inode(struct inode *); 2557 extern void ext4_clear_inode(struct inode *); 2558 extern int ext4_sync_inode(handle_t *, struct inode *); 2559 extern void ext4_dirty_inode(struct inode *, int); 2560 extern int ext4_change_inode_journal_flag(struct inode *, int); 2561 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 2562 extern int ext4_inode_attach_jinode(struct inode *inode); 2563 extern int ext4_can_truncate(struct inode *inode); 2564 extern void ext4_truncate(struct inode *); 2565 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); 2566 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 2567 extern void ext4_set_inode_flags(struct inode *); 2568 extern void ext4_get_inode_flags(struct ext4_inode_info *); 2569 extern int ext4_alloc_da_blocks(struct inode *inode); 2570 extern void ext4_set_aops(struct inode *inode); 2571 extern int ext4_writepage_trans_blocks(struct inode *); 2572 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 2573 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode, 2574 loff_t lstart, loff_t lend); 2575 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 2576 extern int ext4_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf); 2577 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 2578 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid); 2579 extern void ext4_da_update_reserve_space(struct inode *inode, 2580 int used, int quota_claim); 2581 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, 2582 ext4_fsblk_t pblk, ext4_lblk_t len); 2583 extern int ext4_get_next_extent(struct inode *inode, ext4_lblk_t lblk, 2584 unsigned int map_len, 2585 struct extent_status *result); 2586 2587 /* indirect.c */ 2588 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, 2589 struct ext4_map_blocks *map, int flags); 2590 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock); 2591 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks); 2592 extern void ext4_ind_truncate(handle_t *, struct inode *inode); 2593 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode, 2594 ext4_lblk_t start, ext4_lblk_t end); 2595 2596 /* ioctl.c */ 2597 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 2598 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 2599 2600 /* migrate.c */ 2601 extern int ext4_ext_migrate(struct inode *); 2602 extern int ext4_ind_migrate(struct inode *inode); 2603 2604 /* namei.c */ 2605 extern int ext4_dirent_csum_verify(struct inode *inode, 2606 struct ext4_dir_entry *dirent); 2607 extern int ext4_orphan_add(handle_t *, struct inode *); 2608 extern int ext4_orphan_del(handle_t *, struct inode *); 2609 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 2610 __u32 start_minor_hash, __u32 *next_hash); 2611 extern int ext4_search_dir(struct buffer_head *bh, 2612 char *search_buf, 2613 int buf_size, 2614 struct inode *dir, 2615 struct ext4_filename *fname, 2616 const struct qstr *d_name, 2617 unsigned int offset, 2618 struct ext4_dir_entry_2 **res_dir); 2619 extern int ext4_generic_delete_entry(handle_t *handle, 2620 struct inode *dir, 2621 struct ext4_dir_entry_2 *de_del, 2622 struct buffer_head *bh, 2623 void *entry_buf, 2624 int buf_size, 2625 int csum_size); 2626 extern int ext4_empty_dir(struct inode *inode); 2627 2628 /* resize.c */ 2629 extern int ext4_group_add(struct super_block *sb, 2630 struct ext4_new_group_data *input); 2631 extern int ext4_group_extend(struct super_block *sb, 2632 struct ext4_super_block *es, 2633 ext4_fsblk_t n_blocks_count); 2634 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count); 2635 2636 /* super.c */ 2637 extern int ext4_seq_options_show(struct seq_file *seq, void *offset); 2638 extern int ext4_calculate_overhead(struct super_block *sb); 2639 extern void ext4_superblock_csum_set(struct super_block *sb); 2640 extern void *ext4_kvmalloc(size_t size, gfp_t flags); 2641 extern void *ext4_kvzalloc(size_t size, gfp_t flags); 2642 extern int ext4_alloc_flex_bg_array(struct super_block *sb, 2643 ext4_group_t ngroup); 2644 extern const char *ext4_decode_error(struct super_block *sb, int errno, 2645 char nbuf[16]); 2646 2647 extern __printf(4, 5) 2648 void __ext4_error(struct super_block *, const char *, unsigned int, 2649 const char *, ...); 2650 extern __printf(5, 6) 2651 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t, 2652 const char *, ...); 2653 extern __printf(5, 6) 2654 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t, 2655 const char *, ...); 2656 extern void __ext4_std_error(struct super_block *, const char *, 2657 unsigned int, int); 2658 extern __printf(4, 5) 2659 void __ext4_abort(struct super_block *, const char *, unsigned int, 2660 const char *, ...); 2661 extern __printf(4, 5) 2662 void __ext4_warning(struct super_block *, const char *, unsigned int, 2663 const char *, ...); 2664 extern __printf(4, 5) 2665 void __ext4_warning_inode(const struct inode *inode, const char *function, 2666 unsigned int line, const char *fmt, ...); 2667 extern __printf(3, 4) 2668 void __ext4_msg(struct super_block *, const char *, const char *, ...); 2669 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp, 2670 const char *, unsigned int, const char *); 2671 extern __printf(7, 8) 2672 void __ext4_grp_locked_error(const char *, unsigned int, 2673 struct super_block *, ext4_group_t, 2674 unsigned long, ext4_fsblk_t, 2675 const char *, ...); 2676 2677 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 2678 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 2679 2680 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 2681 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 2682 2683 #define EXT4_ERROR_FILE(file, block, fmt, a...) \ 2684 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a) 2685 2686 #ifdef CONFIG_PRINTK 2687 2688 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2689 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__) 2690 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2691 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__) 2692 #define ext4_error(sb, fmt, ...) \ 2693 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2694 #define ext4_abort(sb, fmt, ...) \ 2695 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2696 #define ext4_warning(sb, fmt, ...) \ 2697 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__) 2698 #define ext4_warning_inode(inode, fmt, ...) \ 2699 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__) 2700 #define ext4_msg(sb, level, fmt, ...) \ 2701 __ext4_msg(sb, level, fmt, ##__VA_ARGS__) 2702 #define dump_mmp_msg(sb, mmp, msg) \ 2703 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg) 2704 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2705 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \ 2706 fmt, ##__VA_ARGS__) 2707 2708 #else 2709 2710 #define ext4_error_inode(inode, func, line, block, fmt, ...) \ 2711 do { \ 2712 no_printk(fmt, ##__VA_ARGS__); \ 2713 __ext4_error_inode(inode, "", 0, block, " "); \ 2714 } while (0) 2715 #define ext4_error_file(file, func, line, block, fmt, ...) \ 2716 do { \ 2717 no_printk(fmt, ##__VA_ARGS__); \ 2718 __ext4_error_file(file, "", 0, block, " "); \ 2719 } while (0) 2720 #define ext4_error(sb, fmt, ...) \ 2721 do { \ 2722 no_printk(fmt, ##__VA_ARGS__); \ 2723 __ext4_error(sb, "", 0, " "); \ 2724 } while (0) 2725 #define ext4_abort(sb, fmt, ...) \ 2726 do { \ 2727 no_printk(fmt, ##__VA_ARGS__); \ 2728 __ext4_abort(sb, "", 0, " "); \ 2729 } while (0) 2730 #define ext4_warning(sb, fmt, ...) \ 2731 do { \ 2732 no_printk(fmt, ##__VA_ARGS__); \ 2733 __ext4_warning(sb, "", 0, " "); \ 2734 } while (0) 2735 #define ext4_warning_inode(inode, fmt, ...) \ 2736 do { \ 2737 no_printk(fmt, ##__VA_ARGS__); \ 2738 __ext4_warning_inode(inode, "", 0, " "); \ 2739 } while (0) 2740 #define ext4_msg(sb, level, fmt, ...) \ 2741 do { \ 2742 no_printk(fmt, ##__VA_ARGS__); \ 2743 __ext4_msg(sb, "", " "); \ 2744 } while (0) 2745 #define dump_mmp_msg(sb, mmp, msg) \ 2746 __dump_mmp_msg(sb, mmp, "", 0, "") 2747 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \ 2748 do { \ 2749 no_printk(fmt, ##__VA_ARGS__); \ 2750 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \ 2751 } while (0) 2752 2753 #endif 2754 2755 extern void ext4_update_dynamic_rev(struct super_block *sb); 2756 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 2757 __u32 compat); 2758 extern int ext4_update_rocompat_feature(handle_t *handle, 2759 struct super_block *sb, __u32 rocompat); 2760 extern int ext4_update_incompat_feature(handle_t *handle, 2761 struct super_block *sb, __u32 incompat); 2762 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 2763 struct ext4_group_desc *bg); 2764 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 2765 struct ext4_group_desc *bg); 2766 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 2767 struct ext4_group_desc *bg); 2768 extern __u32 ext4_free_group_clusters(struct super_block *sb, 2769 struct ext4_group_desc *bg); 2770 extern __u32 ext4_free_inodes_count(struct super_block *sb, 2771 struct ext4_group_desc *bg); 2772 extern __u32 ext4_used_dirs_count(struct super_block *sb, 2773 struct ext4_group_desc *bg); 2774 extern __u32 ext4_itable_unused_count(struct super_block *sb, 2775 struct ext4_group_desc *bg); 2776 extern void ext4_block_bitmap_set(struct super_block *sb, 2777 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2778 extern void ext4_inode_bitmap_set(struct super_block *sb, 2779 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2780 extern void ext4_inode_table_set(struct super_block *sb, 2781 struct ext4_group_desc *bg, ext4_fsblk_t blk); 2782 extern void ext4_free_group_clusters_set(struct super_block *sb, 2783 struct ext4_group_desc *bg, 2784 __u32 count); 2785 extern void ext4_free_inodes_set(struct super_block *sb, 2786 struct ext4_group_desc *bg, __u32 count); 2787 extern void ext4_used_dirs_set(struct super_block *sb, 2788 struct ext4_group_desc *bg, __u32 count); 2789 extern void ext4_itable_unused_set(struct super_block *sb, 2790 struct ext4_group_desc *bg, __u32 count); 2791 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group, 2792 struct ext4_group_desc *gdp); 2793 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group, 2794 struct ext4_group_desc *gdp); 2795 extern int ext4_register_li_request(struct super_block *sb, 2796 ext4_group_t first_not_zeroed); 2797 2798 static inline int ext4_has_group_desc_csum(struct super_block *sb) 2799 { 2800 return ext4_has_feature_gdt_csum(sb) || 2801 EXT4_SB(sb)->s_chksum_driver != NULL; 2802 } 2803 2804 static inline int ext4_has_metadata_csum(struct super_block *sb) 2805 { 2806 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && 2807 !EXT4_SB(sb)->s_chksum_driver); 2808 2809 return (EXT4_SB(sb)->s_chksum_driver != NULL); 2810 } 2811 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 2812 { 2813 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 2814 le32_to_cpu(es->s_blocks_count_lo); 2815 } 2816 2817 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 2818 { 2819 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 2820 le32_to_cpu(es->s_r_blocks_count_lo); 2821 } 2822 2823 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 2824 { 2825 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 2826 le32_to_cpu(es->s_free_blocks_count_lo); 2827 } 2828 2829 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 2830 ext4_fsblk_t blk) 2831 { 2832 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 2833 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 2834 } 2835 2836 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 2837 ext4_fsblk_t blk) 2838 { 2839 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 2840 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 2841 } 2842 2843 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 2844 ext4_fsblk_t blk) 2845 { 2846 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 2847 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 2848 } 2849 2850 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 2851 { 2852 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 2853 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 2854 le32_to_cpu(raw_inode->i_size_lo); 2855 else 2856 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 2857 } 2858 2859 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 2860 { 2861 raw_inode->i_size_lo = cpu_to_le32(i_size); 2862 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 2863 } 2864 2865 static inline 2866 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 2867 ext4_group_t group) 2868 { 2869 struct ext4_group_info ***grp_info; 2870 long indexv, indexh; 2871 BUG_ON(group >= EXT4_SB(sb)->s_groups_count); 2872 grp_info = EXT4_SB(sb)->s_group_info; 2873 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 2874 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 2875 return grp_info[indexv][indexh]; 2876 } 2877 2878 /* 2879 * Reading s_groups_count requires using smp_rmb() afterwards. See 2880 * the locking protocol documented in the comments of ext4_group_add() 2881 * in resize.c 2882 */ 2883 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 2884 { 2885 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 2886 2887 smp_rmb(); 2888 return ngroups; 2889 } 2890 2891 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 2892 ext4_group_t block_group) 2893 { 2894 return block_group >> sbi->s_log_groups_per_flex; 2895 } 2896 2897 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 2898 { 2899 return 1 << sbi->s_log_groups_per_flex; 2900 } 2901 2902 #define ext4_std_error(sb, errno) \ 2903 do { \ 2904 if ((errno)) \ 2905 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 2906 } while (0) 2907 2908 #ifdef CONFIG_SMP 2909 /* Each CPU can accumulate percpu_counter_batch clusters in their local 2910 * counters. So we need to make sure we have free clusters more 2911 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 2912 */ 2913 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 2914 #else 2915 #define EXT4_FREECLUSTERS_WATERMARK 0 2916 #endif 2917 2918 /* Update i_disksize. Requires i_mutex to avoid races with truncate */ 2919 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 2920 { 2921 WARN_ON_ONCE(S_ISREG(inode->i_mode) && 2922 !inode_is_locked(inode)); 2923 down_write(&EXT4_I(inode)->i_data_sem); 2924 if (newsize > EXT4_I(inode)->i_disksize) 2925 EXT4_I(inode)->i_disksize = newsize; 2926 up_write(&EXT4_I(inode)->i_data_sem); 2927 } 2928 2929 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */ 2930 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize) 2931 { 2932 int changed = 0; 2933 2934 if (newsize > inode->i_size) { 2935 i_size_write(inode, newsize); 2936 changed = 1; 2937 } 2938 if (newsize > EXT4_I(inode)->i_disksize) { 2939 ext4_update_i_disksize(inode, newsize); 2940 changed |= 2; 2941 } 2942 return changed; 2943 } 2944 2945 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset, 2946 loff_t len); 2947 2948 struct ext4_group_info { 2949 unsigned long bb_state; 2950 struct rb_root bb_free_root; 2951 ext4_grpblk_t bb_first_free; /* first free block */ 2952 ext4_grpblk_t bb_free; /* total free blocks */ 2953 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 2954 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 2955 struct list_head bb_prealloc_list; 2956 #ifdef DOUBLE_CHECK 2957 void *bb_bitmap; 2958 #endif 2959 struct rw_semaphore alloc_sem; 2960 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 2961 * regions, index is order. 2962 * bb_counters[3] = 5 means 2963 * 5 free 8-block regions. */ 2964 }; 2965 2966 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 2967 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1 2968 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2 2969 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3 2970 2971 #define EXT4_MB_GRP_NEED_INIT(grp) \ 2972 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 2973 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \ 2974 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2975 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \ 2976 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state))) 2977 2978 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \ 2979 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2980 #define EXT4_MB_GRP_SET_TRIMMED(grp) \ 2981 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2982 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \ 2983 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state))) 2984 2985 #define EXT4_MAX_CONTENTION 8 2986 #define EXT4_CONTENTION_THRESHOLD 2 2987 2988 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 2989 ext4_group_t group) 2990 { 2991 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 2992 } 2993 2994 /* 2995 * Returns true if the filesystem is busy enough that attempts to 2996 * access the block group locks has run into contention. 2997 */ 2998 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 2999 { 3000 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 3001 } 3002 3003 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 3004 { 3005 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 3006 if (spin_trylock(lock)) 3007 /* 3008 * We're able to grab the lock right away, so drop the 3009 * lock contention counter. 3010 */ 3011 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 3012 else { 3013 /* 3014 * The lock is busy, so bump the contention counter, 3015 * and then wait on the spin lock. 3016 */ 3017 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 3018 EXT4_MAX_CONTENTION); 3019 spin_lock(lock); 3020 } 3021 } 3022 3023 static inline void ext4_unlock_group(struct super_block *sb, 3024 ext4_group_t group) 3025 { 3026 spin_unlock(ext4_group_lock_ptr(sb, group)); 3027 } 3028 3029 /* 3030 * Block validity checking 3031 */ 3032 #define ext4_check_indirect_blockref(inode, bh) \ 3033 ext4_check_blockref(__func__, __LINE__, inode, \ 3034 (__le32 *)(bh)->b_data, \ 3035 EXT4_ADDR_PER_BLOCK((inode)->i_sb)) 3036 3037 #define ext4_ind_check_inode(inode) \ 3038 ext4_check_blockref(__func__, __LINE__, inode, \ 3039 EXT4_I(inode)->i_data, \ 3040 EXT4_NDIR_BLOCKS) 3041 3042 /* 3043 * Inodes and files operations 3044 */ 3045 3046 /* dir.c */ 3047 extern const struct file_operations ext4_dir_operations; 3048 3049 /* file.c */ 3050 extern const struct inode_operations ext4_file_inode_operations; 3051 extern const struct file_operations ext4_file_operations; 3052 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); 3053 3054 /* inline.c */ 3055 extern int ext4_get_max_inline_size(struct inode *inode); 3056 extern int ext4_find_inline_data_nolock(struct inode *inode); 3057 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, 3058 unsigned int len); 3059 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); 3060 3061 extern int ext4_readpage_inline(struct inode *inode, struct page *page); 3062 extern int ext4_try_to_write_inline_data(struct address_space *mapping, 3063 struct inode *inode, 3064 loff_t pos, unsigned len, 3065 unsigned flags, 3066 struct page **pagep); 3067 extern int ext4_write_inline_data_end(struct inode *inode, 3068 loff_t pos, unsigned len, 3069 unsigned copied, 3070 struct page *page); 3071 extern struct buffer_head * 3072 ext4_journalled_write_inline_data(struct inode *inode, 3073 unsigned len, 3074 struct page *page); 3075 extern int ext4_da_write_inline_data_begin(struct address_space *mapping, 3076 struct inode *inode, 3077 loff_t pos, unsigned len, 3078 unsigned flags, 3079 struct page **pagep, 3080 void **fsdata); 3081 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, 3082 unsigned len, unsigned copied, 3083 struct page *page); 3084 extern int ext4_try_add_inline_entry(handle_t *handle, 3085 struct ext4_filename *fname, 3086 struct inode *dir, struct inode *inode); 3087 extern int ext4_try_create_inline_dir(handle_t *handle, 3088 struct inode *parent, 3089 struct inode *inode); 3090 extern int ext4_read_inline_dir(struct file *filp, 3091 struct dir_context *ctx, 3092 int *has_inline_data); 3093 extern int htree_inlinedir_to_tree(struct file *dir_file, 3094 struct inode *dir, ext4_lblk_t block, 3095 struct dx_hash_info *hinfo, 3096 __u32 start_hash, __u32 start_minor_hash, 3097 int *has_inline_data); 3098 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir, 3099 struct ext4_filename *fname, 3100 const struct qstr *d_name, 3101 struct ext4_dir_entry_2 **res_dir, 3102 int *has_inline_data); 3103 extern int ext4_delete_inline_entry(handle_t *handle, 3104 struct inode *dir, 3105 struct ext4_dir_entry_2 *de_del, 3106 struct buffer_head *bh, 3107 int *has_inline_data); 3108 extern int empty_inline_dir(struct inode *dir, int *has_inline_data); 3109 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 3110 struct ext4_dir_entry_2 **parent_de, 3111 int *retval); 3112 extern int ext4_inline_data_fiemap(struct inode *inode, 3113 struct fiemap_extent_info *fieinfo, 3114 int *has_inline, __u64 start, __u64 len); 3115 extern int ext4_try_to_evict_inline_data(handle_t *handle, 3116 struct inode *inode, 3117 int needed); 3118 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline); 3119 3120 extern int ext4_convert_inline_data(struct inode *inode); 3121 3122 static inline int ext4_has_inline_data(struct inode *inode) 3123 { 3124 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && 3125 EXT4_I(inode)->i_inline_off; 3126 } 3127 3128 /* namei.c */ 3129 extern const struct inode_operations ext4_dir_inode_operations; 3130 extern const struct inode_operations ext4_special_inode_operations; 3131 extern struct dentry *ext4_get_parent(struct dentry *child); 3132 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode, 3133 struct ext4_dir_entry_2 *de, 3134 int blocksize, int csum_size, 3135 unsigned int parent_ino, int dotdot_real_len); 3136 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t, 3137 unsigned int blocksize); 3138 extern int ext4_handle_dirty_dirent_node(handle_t *handle, 3139 struct inode *inode, 3140 struct buffer_head *bh); 3141 #define S_SHIFT 12 3142 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = { 3143 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE, 3144 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR, 3145 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV, 3146 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV, 3147 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO, 3148 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK, 3149 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK, 3150 }; 3151 3152 static inline void ext4_set_de_type(struct super_block *sb, 3153 struct ext4_dir_entry_2 *de, 3154 umode_t mode) { 3155 if (ext4_has_feature_filetype(sb)) 3156 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; 3157 } 3158 3159 /* readpages.c */ 3160 extern int ext4_mpage_readpages(struct address_space *mapping, 3161 struct list_head *pages, struct page *page, 3162 unsigned nr_pages); 3163 3164 /* symlink.c */ 3165 extern const struct inode_operations ext4_encrypted_symlink_inode_operations; 3166 extern const struct inode_operations ext4_symlink_inode_operations; 3167 extern const struct inode_operations ext4_fast_symlink_inode_operations; 3168 3169 /* sysfs.c */ 3170 extern int ext4_register_sysfs(struct super_block *sb); 3171 extern void ext4_unregister_sysfs(struct super_block *sb); 3172 extern int __init ext4_init_sysfs(void); 3173 extern void ext4_exit_sysfs(void); 3174 3175 /* block_validity */ 3176 extern void ext4_release_system_zone(struct super_block *sb); 3177 extern int ext4_setup_system_zone(struct super_block *sb); 3178 extern int __init ext4_init_system_zone(void); 3179 extern void ext4_exit_system_zone(void); 3180 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 3181 ext4_fsblk_t start_blk, 3182 unsigned int count); 3183 extern int ext4_check_blockref(const char *, unsigned int, 3184 struct inode *, __le32 *, unsigned int); 3185 3186 /* extents.c */ 3187 struct ext4_ext_path; 3188 struct ext4_extent; 3189 3190 /* 3191 * Maximum number of logical blocks in a file; ext4_extent's ee_block is 3192 * __le32. 3193 */ 3194 #define EXT_MAX_BLOCKS 0xffffffff 3195 3196 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 3197 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 3198 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); 3199 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 3200 struct ext4_map_blocks *map, int flags); 3201 extern void ext4_ext_truncate(handle_t *, struct inode *); 3202 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, 3203 ext4_lblk_t end); 3204 extern void ext4_ext_init(struct super_block *); 3205 extern void ext4_ext_release(struct super_block *); 3206 extern long ext4_fallocate(struct file *file, int mode, loff_t offset, 3207 loff_t len); 3208 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, 3209 loff_t offset, ssize_t len); 3210 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 3211 struct ext4_map_blocks *map, int flags); 3212 extern int ext4_ext_calc_metadata_amount(struct inode *inode, 3213 ext4_lblk_t lblocks); 3214 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode, 3215 int num, 3216 struct ext4_ext_path *path); 3217 extern int ext4_can_extents_be_merged(struct inode *inode, 3218 struct ext4_extent *ex1, 3219 struct ext4_extent *ex2); 3220 extern int ext4_ext_insert_extent(handle_t *, struct inode *, 3221 struct ext4_ext_path **, 3222 struct ext4_extent *, int); 3223 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t, 3224 struct ext4_ext_path **, 3225 int flags); 3226 extern void ext4_ext_drop_refs(struct ext4_ext_path *); 3227 extern int ext4_ext_check_inode(struct inode *inode); 3228 extern int ext4_find_delalloc_range(struct inode *inode, 3229 ext4_lblk_t lblk_start, 3230 ext4_lblk_t lblk_end); 3231 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk); 3232 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); 3233 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 3234 __u64 start, __u64 len); 3235 extern int ext4_ext_precache(struct inode *inode); 3236 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len); 3237 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len); 3238 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1, 3239 struct inode *inode2, ext4_lblk_t lblk1, 3240 ext4_lblk_t lblk2, ext4_lblk_t count, 3241 int mark_unwritten,int *err); 3242 3243 /* move_extent.c */ 3244 extern void ext4_double_down_write_data_sem(struct inode *first, 3245 struct inode *second); 3246 extern void ext4_double_up_write_data_sem(struct inode *orig_inode, 3247 struct inode *donor_inode); 3248 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 3249 __u64 start_orig, __u64 start_donor, 3250 __u64 len, __u64 *moved_len); 3251 3252 /* page-io.c */ 3253 extern int __init ext4_init_pageio(void); 3254 extern void ext4_exit_pageio(void); 3255 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); 3256 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); 3257 extern int ext4_put_io_end(ext4_io_end_t *io_end); 3258 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); 3259 extern void ext4_io_submit_init(struct ext4_io_submit *io, 3260 struct writeback_control *wbc); 3261 extern void ext4_end_io_rsv_work(struct work_struct *work); 3262 extern void ext4_io_submit(struct ext4_io_submit *io); 3263 extern int ext4_bio_write_page(struct ext4_io_submit *io, 3264 struct page *page, 3265 int len, 3266 struct writeback_control *wbc, 3267 bool keep_towrite); 3268 3269 /* mmp.c */ 3270 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); 3271 3272 /* 3273 * Add new method to test whether block and inode bitmaps are properly 3274 * initialized. With uninit_bg reading the block from disk is not enough 3275 * to mark the bitmap uptodate. We need to also zero-out the bitmap 3276 */ 3277 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 3278 3279 static inline int bitmap_uptodate(struct buffer_head *bh) 3280 { 3281 return (buffer_uptodate(bh) && 3282 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 3283 } 3284 static inline void set_bitmap_uptodate(struct buffer_head *bh) 3285 { 3286 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 3287 } 3288 3289 /* 3290 * Disable DIO read nolock optimization, so new dioreaders will be forced 3291 * to grab i_mutex 3292 */ 3293 static inline void ext4_inode_block_unlocked_dio(struct inode *inode) 3294 { 3295 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 3296 smp_mb(); 3297 } 3298 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode) 3299 { 3300 smp_mb(); 3301 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK); 3302 } 3303 3304 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 3305 3306 /* For ioend & aio unwritten conversion wait queues */ 3307 #define EXT4_WQ_HASH_SZ 37 3308 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\ 3309 EXT4_WQ_HASH_SZ]) 3310 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 3311 3312 #define EXT4_RESIZING 0 3313 extern int ext4_resize_begin(struct super_block *sb); 3314 extern void ext4_resize_end(struct super_block *sb); 3315 3316 static inline void ext4_set_io_unwritten_flag(struct inode *inode, 3317 struct ext4_io_end *io_end) 3318 { 3319 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { 3320 io_end->flag |= EXT4_IO_END_UNWRITTEN; 3321 atomic_inc(&EXT4_I(inode)->i_unwritten); 3322 } 3323 } 3324 3325 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end) 3326 { 3327 struct inode *inode = io_end->inode; 3328 3329 if (io_end->flag & EXT4_IO_END_UNWRITTEN) { 3330 io_end->flag &= ~EXT4_IO_END_UNWRITTEN; 3331 /* Wake up anyone waiting on unwritten extent conversion */ 3332 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten)) 3333 wake_up_all(ext4_ioend_wq(inode)); 3334 } 3335 } 3336 3337 static inline bool ext4_aligned_io(struct inode *inode, loff_t off, loff_t len) 3338 { 3339 int blksize = 1 << inode->i_blkbits; 3340 3341 return IS_ALIGNED(off, blksize) && IS_ALIGNED(len, blksize); 3342 } 3343 3344 #endif /* __KERNEL__ */ 3345 3346 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 3347 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 3348 3349 #endif /* _EXT4_H */ 3350